WO2019206194A1

WO2019206194A1 - Prefabricated floor slab, connection structure thereof and construction method therefor

Info

Publication number: WO2019206194A1
Application number: PCT/CN2019/084138
Authority: WO
Inventors: 李藏柱
Original assignee: Li Cangzhu
Priority date: 2018-04-25
Filing date: 2019-04-24
Publication date: 2019-10-31
Also published as: CN108661221A

Abstract

Disclosed are a prefabricated floor slab, a connection structure thereof and a construction method therefor. The prefabricated floor slab comprises a floor slab module (1), wherein connecting steel bars (11) are fixed to two opposite circumferential side faces of the floor slab module (1); enlarged heads (110) are fixed to the ends of the connecting steel bars (11) extending out of the floor slab module (1); the size of the enlarged head (110) is larger than the external diameter of the connecting steel bar (11); and a first post-cast strip (102) is reserved between two adjacent prefabricated floor slabs, the two opposite connecting steel bars (11) in the two adjacent prefabricated floor slabs are connected by means of sleeves (2), and mounting holes (22) adapted to the external diameter of the ends of the enlarged heads (110) are formed in the sleeves (2). The prefabricated floor slab is easy to connect, and has a good overall performance.

Description

Prefabricated floor slab and connecting structure thereof and construction method thereof

Technical field

The invention relates to the field of fabricated buildings, in particular to a prefabricated floor slab and a connecting structure thereof and a construction method thereof.

Background technique

At present, the construction of building slabs mainly adopts three methods: cast-in-place, traditional prefabricated hollow slab and prefabricated laminated slab.

First, the cast-in-place is to carry out steel bar binding and concrete pouring on the wall panel, floor slab and beam-column structure of the building. Although the building constructed in this mode has the advantages of good integrity and good earthquake resistance, it has many shortcomings, which are as follows:

1. Requires a large number of turnover materials such as templates and support frames, which is wasteful and not environmentally friendly;

2, the site is divided into template installation, steel banding, pouring concrete and curing, etc., the construction is difficult, and affected by the weather, the construction quality is difficult to control, easy to cause cracking, affecting the service life and reducing the earthquake resistance;

3. Due to the large number of processes, and the cast-in-place concrete needs to reach a certain strength, the construction of the superstructure can be carried out, and the construction period is long;

4, due to many processes, cross-site operations, mutual interference, unsafe, not environmentally friendly;

5. Because the cast-in-place reinforced concrete structure is self-contained, the span of the slab is limited: the flat cast-in-place structure of 4 meters has reached the limit, the well-shaped beam structure can only reach 6 meters at most, and the thickness of the well-shaped beam structure is large, affecting The net height of the room.

Second, the traditional prefabricated hollow slab is processed in the factory, realized industrialization, has the advantages of no weather and weather restrictions during processing, quality can be guaranteed, and a large number of templates and supports are saved.

However, the existing prefabricated hollow plate is as shown in FIG. 44, and the disadvantages are as follows:

1. The perimeter of the prefabricated panel is smooth. After lap jointing on the beam, there is no connection between adjacent prefabricated panels, so the overallity is poor and the seismic resistance is greatly reduced. It can only be applied to low-rise buildings;

2. After the adjacent prefabricated panels are spliced, the joint seams running up and down are formed, which are prone to cracking, leakage and hollow cracking of the decorative layer;

3. Since there is no transverse steel bar in the existing hollow floor slab, its width is limited, generally only 1.2 meters;

4. After the installation of the existing hollow floor slab, the treatment of the decorative layer and the fireproof layer is required, resulting in secondary construction.

Third, the prefabricated laminate floor is composed of two parts, the bottom is the prefabricated part (as shown in Figure 45), mostly thin, processed in the factory, transported to the site for lifting, and then the second steel bar is tied on the prefabricated surface. Pouring with a layer of concrete slabs at the top. The laminated board technology is commonly used in existing prefabricated buildings. One is because the prefabricated part can be used as the bottom formwork of the cast-in-place board, which saves the formwork; the second is because the top cast-in-place board is the whole panel, and the steel bars are pulled together, so Compared with the traditional prefabricated hollow slab, the integrity is good. However, the following disadvantages exist:

1. Since the laminated slab is a double-layer structure, its thickness is thicker than that of the cast-in-situ slab, which increases the raw materials, increases its own weight, and reduces the load and shock resistance;

2, double-layer plate structure, easy to hollow crack at the joint layer, and the quality of secondary casting is not easy to control, prone to cracks and other quality problems;

3. The construction site should be hoisted, cast-in-place, with many processes and complicated construction;

4. Because there is a cast-in-place layer, it can only wait for the strength of the cast-in-place layer to meet certain requirements before the construction of the superstructure can be carried out, so the construction period is long;

5, due to its self-importance, so the span is limited, currently can only be used in residential buildings, not applicable to underground garages, shopping malls and other buildings.

Summary of the invention

The object of the present invention is to provide a prefabricated floor slab and a connecting structure thereof, which have the advantages that the adjacent floor slabs are easy to connect and have good integrity.

The above technical object of the present invention is achieved by the following technical solutions: a prefabricated floor slab, comprising a floor slab module, the opposite side walls of the slab module are fixed with connecting steel bars, and the ends of the reinforced floor panels are extended and enlarged. The size of the enlarged head is larger than the outer diameter of the connecting reinforcing bar.

Further, the prestressed reinforcing bar is fixed in parallel with the connecting reinforcing bar in the floor module.

Further, the connecting steel portion is embedded or lengthened in the floor module.

Further, the reinforcing mesh frame is embedded in the floor module.

Further, the steel mesh frame comprises an upper reinforcing mesh, a lower reinforcing mesh parallel to the upper reinforcing mesh, a supporting reinforcing mesh connected between the upper reinforcing mesh and the lower reinforcing mesh, and the supporting reinforcing mesh is vertically supported between the upper reinforcing mesh and the lower reinforcing mesh .

Further, the outer side surface of the floor module and the circumferential side perpendicular to the connecting steel bar are embedded with the horizontal reinforcing bar.

Further, the upper surface of the floor module is fixed with a decorative layer and/or a wear layer; the lower surface of the floor module is fixed with an insulation layer and/or a fireproof layer and/or a sound insulation layer.

Through the above technical solution, the adjacent prefabricated floor slabs are well connected together, the slab integrity is improved, and the sleeve connection structure adopts the clamping principle, and the tensile force of the steel joint is converted into the pressure of the concrete of the cylinder body. Furthermore, it is transmitted to the cylinder body, and the connection is more firm, which solves the problem of the integrity of the conventional prefabricated hollow slab and the poor earthquake resistance.

Another object of the present invention is to provide a joint structure of a prefabricated floor panel, which comprises the above-mentioned prefabricated floor slab, a first post-casting strip is reserved between two adjacent prefabricated slabs, and two of the two adjacent prefabricated slabs are opposite The connecting steel bars are connected by a sleeve, and the sleeve is provided with a mounting hole adapted to the outer diameter of the enlarged head end.

Further, the sleeves are misaligned in the first post-cast strip.

Further, the side of the adjacent two prefabricated slabs is further fixed with an auxiliary connecting rib, and the auxiliary connecting rib extends from the end of the prefabricated slab to provide a hook portion, and the first post-casting strip is provided with a long reinforcing bar through a plurality of hook portions.

Still another object of the present invention is to provide a method of constructing a joint structure of a prefabricated floor panel, comprising the steps of:

S1, prefabricating a wall panel or a steel frame on the ground, the prefabricated floor slab according to any one of claims 1-7 is hoisted to the upper end surface of the wall panel or the steel frame, and spreads along the horizontal plane to form a slab, two adjacent to the horizontal plane Forming a first post-casting strip between the prefabricated floors;

S2, prefabricated floor slab and wallboard/steel frame are embedded with steel angle iron, and the space formed by two adjacent prefabricated slabs and wallboard/steel frame forms a second post-casting belt;

S3, the connecting steel bars of the adjacent two prefabricated floors are aligned and spliced into the sleeve, and the long reinforcing bars are arranged through the hook portion;

S4, supporting a bottom mold at a lower end portion of the first post-casting strip and the second post-casting strip, and pouring concrete in the first post-casting strip and the second post-casting strip;

After the concrete in the first post-casting strip and the second post-casting strip is solidified, the upper surface and the lower surface of the solidified concrete are separately treated.

The hollow structure is arranged to reduce the self-weight, improve the shock resistance, sound insulation and heat preservation performance, and save materials and environmental protection.

Pre-stressed steel bars are placed in the prefabricated slabs to increase the slab span, save steel, reduce costs, improve the ductility and shock resistance of the slabs, and can be applied to large space structures such as commercial, industrial, warehouse and underground parking lots.

The prefabricated floor slab is processed into a heat-insulating and decorative integrated board. The site does not require large-area secondary construction, which reduces the work of leveling, decoration and insulation. Prefabricated slabs are prefabricated, factory-processed, material saving, high construction efficiency, short construction period, low cost and good economy.

In summary, the present invention has the following beneficial effects:

1. The structure is light and high-strength, and it is connected by connecting steel bars and sleeves. It has good integrity and good earthquake resistance;

2. The hollow structure has a village rate of more than 40%, and the sound insulation performance is good; the insulation and decoration are integrated, the concrete cracking problem is solved, the durability is good, the secondary operation is reduced, and the construction period is shortened;

3. Prefabricated slabs are light in weight, high in strength, large in span, and can be used in a wide range;

4. When constructing on site, there is no need to wait for the concrete strength to rise, and it can be operated continuously, which greatly shortens the construction period.

DRAWINGS

Figure 1 is a structural view of a prefabricated floor in the first embodiment;

Figure 2 is a schematic view showing a prefabricated floor slab for connecting the reinforcing bars to the long reinforcing bars;

Figure 3 is a schematic view showing a prefabricated floor slab for connecting U-shaped connecting bars;

Figure 4 is a schematic view of the prestressed steel bar in the prefabricated floor slab located near the lower surface;

Figure 5 is a schematic view showing the structure of the prestressed steel bars in the prefabricated floor slab;

Figure 6 is a schematic view showing the structure of the end of the prestressed reinforcing bar connecting the enlarged head;

Figure 7 is a schematic view showing the provision of transverse reinforcing bars in the prefabricated floor slab;

Figure 8 is a schematic view of a pre-embedded steel mesh frame in a prefabricated floor;

Figure 9 is a schematic view showing the support unit in the steel mesh frame in a U shape;

Figure 10 is a schematic view showing a unit made of a triangle in a steel mesh frame;

Figure 11 is a schematic view showing a pre-buried U-shaped reinforcing bar on the circumferential side of the hollow prefabricated floor slab;

Figure 12 is a schematic view of a pre-formed U-shaped steel bar on the circumferential side of the prefabricated floor slab;

Figure 13 is a schematic view showing an additional layer structure when the floor panel is used in a garage;

Figure 14 is a schematic view showing the structure of an additional layer structure attached to the surface of the floor module;

Figure 15 is a schematic view showing the structure of an additional layer structure disposed in the recessed groove;

Figure 16 is a schematic view showing the pre-embedded side of the prefabricated floor slab;

Figure 17 is a schematic view showing the prefabricated floor surface mounted embedded parts;

Figure 18 is a schematic structural view of the prefabricated floor slab arranged in the width direction;

Figure 19 is a schematic structural view of a prefabricated floor slab;

Figure 20 is a schematic view showing the pre-buried long steel bars and stirrups in the first post-casting strip when the prefabricated floor slabs are spliced;

Figure 21 is a schematic view showing a pre-buried U-shaped reinforcing bar in the first post-casting strip when the prefabricated floor slab is spliced;

Figure 22 is a schematic view showing the structure of the sleeves being misaligned when the prefabricated floor slabs are spliced;

Figure 23 is a schematic view of the prefabricated floor slab connection auxiliary connecting rib;

Figure 24 is a schematic view showing the longitudinal connection of the prefabricated floor slab and the lateral direction;

Figure 25 is a schematic view showing the structure of an additional layer fixed on the surface of the prefabricated floor slab after completion of splicing;

Figure 26 is a schematic view showing the structure of a prefabricated floor slab and an I-beam;

Figure 27 is a schematic view showing the connection of a prefabricated floor slab and a precast concrete beam;

Figure 28 is a schematic view showing the pre-buried U-shaped connecting ribs in the precast concrete beam when the prefabricated floor slab and the precast concrete beam are connected;

29 is a schematic structural view of a prefabricated floor slab and a prefabricated wall panel splicing;

Figure 30 is a structural schematic view showing the width of the first post-casting strip being smaller than the thickness of the pre-formed wallboard when the prefabricated floor slab and the prefabricated wall panel are spliced;

Figure 31 is a schematic view showing a concrete pouring port between the end of the prefabricated floor slab and the upper prefabricated wall panel;

Figure 32 is a schematic view of the pre-embedded steel plate at the splicing position of the floor slab module and the prefabricated wall panel;

Figure 33 is a schematic view of the pre-embedded bolt sleeve in the upper and lower surfaces of the floor module and the prefabricated wall panel;

Figure 34 is a schematic view of the circumferential side of the prefabricated bolt sleeve of the floor panel module and the prefabricated wall panel;

Figure 35 is a schematic structural view of a cylinder in a shrink-type reinforcing steel connecting sleeve;

Figure 36 is a schematic end view of the neck;

Figure 37 is a schematic view of the fit of the sleeve and the connecting bar;

Figure 38 is a schematic view showing the connection relationship between the shrink-type reinforcing bar connecting sleeve and the prefabricated plate;

Figure 39 is a schematic structural view of a split type cylinder;

Figure 40 is a schematic view showing the connection relationship between the split cylinder and the prefabricated panel;

Figure 41 is a schematic view showing the structure of the sleeve connected to the two reinforcing bars in the vertical state;

Figure 42 is a schematic structural view of the outer sleeve member;

Figure 43 is a schematic view showing the assembly of the outer sleeve and the connecting reinforcing bar;

Figure 44 is a drawing of a conventional prefabricated hollow panel in the background art;

Figure 45 is a drawing of a prefabricated laminate in the background art;

Figure 46 is an effect view of the prefabricated floor slab of the present invention;

Figure 47 is a perspective view of the finish of the prefabricated floor slab of the present invention.

In the figure, 1, floor module; 11, connecting steel; 110, enlarged head; 12, prestressed steel; 13, transverse steel; 14, steel mesh; 141, upper steel mesh; 142, lower steel mesh; Steel mesh; 1431, long steel bar; 1432, long steel bar; 1433, support unit; 15, hollow hole; 16, U-shaped steel; 17, additional layer structure; 171, decorative layer; 172, wear layer; 173, insulation layer; 174, fireproof layer; 175, sound insulation layer; 176, recessed groove; 18, embedded parts; 181, embedded steel plate; 182, pre-embedded angle iron; 183, bolt sleeve; 191, hook portion; 101, pouring gap; 102, first post-casting strip; 1021, long-length steel; 1022, stirrup; 1023, U-shaped reinforcing steel; 1024, reinforcing stirrup; 1025, U-shaped connecting rib ; 103, the second post-casting belt;

2, sleeve; 20, stud; 21, stud hole; 22, mounting hole; 3, steel beam; 4, precast concrete beam; 5, fixed angle iron; 51, fixing bolt; 6, cylinder; Shrinking; 611, transitional conical surface; 62, grouting hole; 63, connecting plate; 631, through hole; 64, baffle element; 65, snap block; 651, snap hole; 66, shrapnel; Board; 71, prefabricated wall panels.

detailed description

The present invention will be further described in detail below with reference to the embodiments.

Embodiment 1: A prefabricated floor slab, as shown in Fig. 1, the prefabricated slab is cast according to the actual condition to form a slab module 1. The surrounding side of the floor module 1 is pre-embedded and connected with the reinforcing steel 11, and the connecting reinforcing bar 11 extends from the end of the floor module 1 to fix the enlarged head 110. The outer diameter of the enlarged head 110 is larger than the outer diameter of the connecting reinforcing bar 11, so as to facilitate the subsequent slab module 1 Splicing to form a floor.

As shown in FIG. 2, the connecting steel bar 11 can be disposed through the floor module 1 and can be single or double layer; as shown in FIG. 3, the connecting steel bar 11 can also be partially embedded in the floor module 1, and the embedded part is embedded. It can be a straight rib or a curved rib, or it can be connected in a U shape.

(For convenience of explanation, the direction in which the reinforcing bars 11 are provided is defined as the longitudinal direction, and the direction perpendicular thereto is the lateral direction)

As shown in FIG. 4, in order to increase the bearing strength of the floor module 1, a plurality of prestressed reinforcing bars 12 are disposed through the floor module 1, and the prestressed reinforcing bars 12 are arranged in the floor module 1 near the lower surface and in the horizontal direction. cloth.

As shown in FIG. 5, the prestressed reinforcing bars 12 may also be arranged in the up and down manner in the floor module 1, and disposed at a position close to the upper surface and/or the lower surface of the prefabricated floor. The lower prestressed reinforcing bar 12 is more than the upper prestressed reinforcing bar 12, for example, may have a 2:1 relationship.

As shown in FIG. 6, the prestressed reinforcing bar 12 extends beyond the end of the floor module 1 to fix the enlarged head 110. The outer diameter of the enlarged head 110 is larger than the outer diameter of the prestressed reinforcing bar 12.

As shown in FIG. 7, in order to increase the lateral width of the floor module 1, a transverse reinforcing bar 13 may be disposed in the floor module 1, and the transverse reinforcing bars 13 are preferably disposed near the lower surface of the floor module 1 to enhance the lateral bending resistance of the floor module 1. .

In addition, as shown in FIG. 8, when the building opening is large, that is, the size of the prefabricated floor slab module 1 is large, the reinforcing mesh frame 14 can be embedded in the slab module 1. The reinforcing mesh frame 14 includes an upper reinforcing mesh 141 and a lower reinforcing mesh 142 disposed in parallel with the upper reinforcing mesh 141. The upper reinforcing mesh 141 and the lower reinforcing mesh 142 are connected by a plurality of supporting reinforcing meshes 143. The support reinforcing mesh 143 is vertically disposed between the upper reinforcing mesh 141 and the lower reinforcing mesh 142, and is welded and fixed to the upper reinforcing mesh 141 and the lower reinforcing mesh 142 to improve the load-bearing strength of the prefabricated floor.

A long hollow hole 15 may be provided between the adjacent two supporting reinforcing meshes 143 to reduce the weight of the entire floor panel module 1, and the hollow holes 15 are longitudinally disposed.

The structure of the upper reinforcing mesh 141 and the lower reinforcing mesh 142 are the same. The structure of the upper reinforcing mesh 141 is taken as an example. The main reinforcing bar and the longitudinal reinforcing bar are welded and fixed to each other, and the intersection of the transverse reinforcing bar and the longitudinal reinforcing bar is tied and fixed. At the same time, the upper end portion of the supporting reinforcing mesh 143 is welded to the upper reinforcing mesh 141, and the lower end portion of the supporting reinforcing mesh 143 is welded to the lower reinforcing mesh 142.

As shown in Fig. 9, the support reinforcing mesh 143 is a plurality of trusses which are longitudinally arranged parallel to each other. The supporting reinforcing mesh 143 mainly comprises an upper long reinforcing bar 1431 parallel to the upper reinforcing mesh 141, and a lower long reinforcing bar 1432 parallel to the lower reinforcing mesh 142. The upper long reinforcing bar 1431 and the lower long reinforcing bar 1432 are parallel, and the upper long reinforcing bar 1431 is connected. A plurality of supporting units 1433 formed by bending a plurality of reinforcing bars are supported between the lower and the long reinforcing bars 1432. The supporting unit 1433 has a U shape (refer to FIG. 9) or a triangle (refer to FIG. 10), and the upper vertex of the supporting unit 1433 is welded simultaneously with the horizontal reinforcing bars 1431 and the transverse reinforcing bars of the upper reinforcing mesh 141, and the lower vertex and the lower side of the supporting unit 1433 The transverse reinforcing bars 1432 and the transverse reinforcing bars of the lower reinforcing mesh 142 are simultaneously welded.

It should be noted that the steel mesh frame 14 described above selects small-diameter steel bars, for example, 4-6 mm steel bars; and the connecting steel bars 11 for connecting two adjacent floor plate modules 1 need to have a large diameter. In order to play a better tensile effect, such as steel bars with a diameter of 16mm.

Further, as shown in FIGS. 8 and 9, all or part of the reinforcing bars of the upper reinforcing mesh 141 and/or the lower reinforcing mesh 142 protrudes from the circumferential side of the floor module 1; with reference to FIGS. 9 and 10, the upper reinforcing mesh 141 and / Or the reinforcing bar 142 extends beyond the side of the first side of the floor module to form the reinforcing head 110. After the extension of the steel bars of the different floor modules 1 for tying, welding or sleeve 2 connection, the integrity of the floor slab can be further enhanced.

As shown in FIG. 11 and FIG. 12, the U-shaped reinforcing bars 16 in the vertical direction may be embedded in the circumferential side of the floor panel module 1, and one end of the opening of the U-shaped reinforcing bars 16 is buried in the floor panel module 1. The U-shaped steel bar 16 is a kind of way of connecting two adjacent prefabricated floor slabs, and can be combined with the method of connecting the expansion head 110 connecting the steel bars 11 with the sleeve 2, so that the integrity of the floor slab is better.

Existing assembly-type construction technology, after the completion of the main structure, also requires decoration and decoration works. In order to synchronize the decoration and decoration works with the main structure, an integrally formed additional layer structure 17 may be provided on the upper surface and the lower surface of the floor panel module 1.

As shown in FIG. 13, when the prefabricated floor is used for a garage, the upper surface of the floor module 1 is fixed with a wear layer 172, and the lower surface is provided with an insulation layer 173, a fire barrier layer 174, a sound insulation layer 175, or a composite layer of the three. When the prefabricated floor is used for the residential floor, the upper surface is provided with a decorative layer 171 as a tile on the existing floor.

For example, the insulating layer 173 of the prefabricated floor slab is selected from a polystyrene board having a thickness of 50 mm, the fireproof layer 174 is selected from a Class A fireproof rock wool board having a thickness of 50 mm, and the sound insulating layer 175 is selected as a fiber plaster board having a thickness of 2 cm.

As shown in FIG. 14 and FIG. 15, in order to facilitate the installation of the prefabricated floor slab, the upper layer and the lower surface of the floor panel module 1 are not provided with the additional layer structure 17 at the overlap with the prefabricated wall panel 71 or the beam, that is, the additional decorative layer 171 does not extend to Prefabricated slab edges.

As shown in FIG. 14, the additional layer structure 17 is attached to the surface of the floor module 1; as shown in FIG. 15, the surface of the floor module 1 is provided with a recessed groove 176, and the additional layer structure 17 is disposed in the recessed groove 176, the surface and the floor. The surface of module 1 is flush.

In addition, the additional layer structure 17 of the floor module 1 can also be pre-buried for the passage of wires such as later wires and network cables.

As shown in FIG. 16 and FIG. 17, in order to facilitate the erecting installation of the prefabricated floor slab, the circumferential side of the slab module 1 is disposed near the bottom surface or the bottom surface thereof is adjacent to the circumferential side surface, and the embedded part 18 is provided, and the embedded part 18 can be embedded. Steel plate 181 or pre-embedded angle iron 182 or bolt sleeve 183.

In addition, in order to facilitate the erecting installation of the prefabricated floor slab, the peripheral side of the prefabricated slab is fixed in parallel with the connecting reinforcing bar 11 to fix the auxiliary connecting rib 19, and the end of the auxiliary connecting rib 19 extending out of the prefabricated floor slab is bent inward to form the hook portion 191. The circumferential side of the prefabricated floor slab is recessed to form a pouring gap 101 to strengthen the connection of adjacent prefabricated floors. The angle iron 182 and the bolt sleeve 183 are pre-embedded at the joint position of the prefabricated floor slab with the wall panel or the steel pillar to strengthen the connection of the prefabricated slab to the wall panel or the steel pillar. The rendering of the final floor module 1 is shown in Figure I-3, and the finishing effect is shown in Figure I-4.

Embodiment 2:

A joint structure of a prefabricated floor slab, as shown in Fig. 18, is formed by laying a prefabricated floor slab of the first embodiment in a horizontal direction. Two adjacent prefabricated slabs are connected in the longitudinal direction with connecting reinforcing bars 11 and can be directly spliced in the lateral direction.

A first post-casting strip 102 is formed between two adjacent prefabricated slabs, and the connecting reinforcing bars 11 are connected by a sleeve 2. As shown in FIG. 19, both ends of the sleeve 2 are provided with mounting holes 22 adapted to the outer diameter of the enlarged head 110 connecting the reinforcing bars 11, and the connecting reinforcing bars 11 in the two prefabricated floors are respectively inserted into the sleeve 2 to realize two prefabrication. The connection of the floor (the structure of the sleeve 2 and the specific connection method are described in the last paragraph).

Further, as shown in FIG. 20, in order to strengthen the connection, the first post-casting belt 102 is further provided with a plurality of long-length reinforcing bars 1021 and a stirrup 1022 surrounding the plurality of long-length reinforcing bars 1021. The four long-length reinforcing bars 1021 are perpendicularly arranged with the connecting reinforcing bars 11, and the cross-section lines are formed into a square. The hoops 1022 are hooped on the outer circumferences of the four long-length reinforcing bars 1021, and the connecting positions of the long reinforcing bars 1021 and the stirrups 1022 are welded and fixed. .

Further, as shown in FIG. 21, the sides of the adjacent two prefabricated slabs are also fixed with U-shaped reinforcing steel bars 1023, and the long-length reinforcing bars 1021 are transversely passed through a plurality of U-shaped reinforcing steel bars 1023, and the reinforcing stirrups 1024 are matched. The interior of the first post-casting strip 102 forms three intersecting pull-over grids in the lateral direction, which greatly enhances the connection effect of two adjacent prefabricated floors.

As shown in Figure 22, the sleeves 2 in the first post-cast strip 102 can be staggered. Referring to FIG. 23, the U-shaped reinforcing steel bar 1023 may be arranged in parallel with the auxiliary connecting rib 19 on the side of the adjacent two prefabricated slabs. The auxiliary connecting rib 19 extends from the end of the prefabricated slab to provide a hook portion 191. The reinforcing bar 1021 passes through a plurality of hook portions 191 and is ligated to the hook portion 191.

When the U-shaped reinforcing bar 16 is adopted, the long-length reinforcing bar 1021 needs to be pierced from one end of the first post-casting strip 102, and the auxiliary connecting rib 19 is adopted. When the auxiliary connecting rib 19 is set only at the bottom single layer, The long reinforcing bar 1021 can be placed in the hook portion 191 in place, and the mounting is easier.

Embodiment 3:

The difference from the second embodiment is that, as shown in FIG. 24, when a plurality of floor units are installed, in addition to the first rear ladle 102 disposed in the longitudinal direction, a second post-cast is disposed between the two adjacent prefabricated floors adjacent to each other. Belt 103. The solution not only does not have the formation of the seam, but the first backing strip 102 and the second backing strip 103 form a grid-like reinforcing beam body, so that the overall structure of the floor is better.

The reinforcing bars extending from the lateral surface of the floor module 1 are connected to each other and then poured into the second post-casting strip 103, thereby further reinforcing the lateral connection of the two prefabricated floors.

As shown in Fig. 24, the laterally extending reinforcing bar ends may also be provided as enlarged heads 110 and joined by a sleeve 2.

The laterally extending reinforcing bars may be transverse reinforcing bars of the reinforcing mesh frame 14, or additional reinforcing reinforcing bars. The reinforcing bar arrangement in the second post-casting strip 103 can be made with reference to the first post-casting strip 102.

As shown in Fig. 25, after the concrete of the first post-cast strip 102 and the second post-cast strip 103 is solidified, an additional layer structure 17 may be provided on the upper and lower surfaces thereof. For example, when the wear layer 172 is disposed on the top surface of the precast slab, the wear layer 172 material of the same thickness may be cast on the upper portion of the post-casting strip. Then, the newly poured wear layer 172 is ground to form a whole surface of the entire wear layer 172, and the surface decoration layer is completed.

Since the prefabricated floor slab is processed into a decorative integrated board, it is only necessary to supplement the decorative layer on the post-casting part at a later stage, and the workload is small, which can greatly shorten the construction period of the whole building.

Before the first post-casting strip 102 and the second post-casting strip 103 are poured into the concrete, the installation of the pre-buried pipeline can also be carried out to facilitate the installation of the water, electricity and network cables in the later stage.

Embodiment 4:

On the basis of the first embodiment, a joint structure of a prefabricated floor slab is provided with a steel beam 3 or a precast concrete beam 4 at the bottom of the first post-casting belt 102.

As shown in FIG. 26, when the bottom is a steel beam 3, such as an I-beam, a peg hole 21 can be formed in the sleeve 2, and the peg 20 passes through the peg hole 21 on the sleeve 2 and Steel beam 3 is welded.

As shown in Fig. 27, when the bottom is a precast concrete beam 4, two precast slabs are lapped on top of the precast concrete beam 4. As shown in Fig. 28, the top surface of the precast concrete beam 4 is provided with a pre-embedded U-shaped connecting rib 1025, and the U-shaped connecting rib 1025 is inserted into the first post-casting strip 102, so that the beam and the floor panel are integrated into one body, and the connection node is further Firm.

Embodiment 5:

The difference from the fourth embodiment is that, as shown in FIG. 29, the bottom of the first post-casting strip 102 is provided with a prefabricated wall panel 71, and the width of the first post-cast strip 102 is smaller than the thickness of the prefabricated wall panel 71, thereby realizing two pieces. The prefabricated floor slab can be attached to the top surface of the prefabricated wall panel 71.

As shown in FIG. 30, the width of the first post-cast strip 102 may also be smaller than the thickness of the prefabricated wall panel 71. This arrangement has several advantages: First, the width of the first post-cast strip 102 is increased to facilitate the internal reinforcing bar. Installation, especially the installation of the sleeve 2; second, as shown in Fig. 31, when the upper prefabricated wall panel 71 needs to be installed first, and then the first post-casting belt 102 concrete is poured, the end of the prefabricated floor slab and the upper prefabricated wall panel A concrete pouring port can be left between the 71s.

Since the thickness of the general prefabricated wall panel 71 is 150 and 200 mm, when the two prefabricated floor slabs are overlapped on the top of the prefabricated wall panel 71, the width of the first post-casting strip 102 is smaller, which is inconvenient for the installation of the inner reinforcing bar and the sleeve 2. . However, if the lap joint is only 30-50 mm, since the thickness range of the prefabricated wall panel 71 is a protective layer, it is easily crushed under a large pressure. Therefore, in order to facilitate the installation of the prefabricated floor slab and the prefabricated wall panel 71, as shown in FIG. 32, the bottom surface of the slab module 1 is provided with a pre-embedded steel plate 181 near the circumferential side surface, and the prefabricated wall panel 71 is provided with a pre-embedded steel plate 181 near the upper end side. . When installing, the two pre-embedded steel plates 181 are welded to better temporarily fix the prefabricated floor slab. This kind of fixing method can meet the force requirement as long as the lap length is more than 20mm, and the other support settings for the prefabricated floor slab are omitted, and the construction efficiency is improved.

Further, the embedded steel plate 181 can be replaced with a pre-embedded angle iron 182 or a pre-embedded bolt sleeve 183.

As shown in FIG. 33, the bottom surface of the floor panel module 1 is provided with a pre-embedded bolt sleeve 183 near the side of the circumference, and the side of the prefabricated wall panel 71 near the upper end is provided with a pre-embedded bolt sleeve 183; then the fixed angle iron 5 is mounted on the prefabricated The corner between the floor and the prefabricated wall panel 71 is connected; after the fixing bolt 51 passes through the fixed angle iron 5, the screw bolt 183 is screwed into the pre-embedded bolt sleeve 183 to strengthen the connection.

As shown in Fig. 34, the pre-embedded bolt sleeve 183 can also be mounted on the upper end surface of the prefabricated wall panel 71 and the peripheral side of the prefabricated floor panel. In this arrangement, the fixed angle iron 5 is finally poured in the end back pouring belt, and does not need to be disassembled, thereby improving the construction efficiency.

Example 6:

A prefabricated floor slab construction method mainly involves the use of a plurality of prefabricated floor slabs to form a slab, and the fixing of the slab and the wall or the beam body, mainly comprising the following steps:

S1, support the column in advance on the ground, fix the beam above the column, the beam can be steel beam 3 or concrete precast beam

S2, the prefabricated floor slab is hoisted to the top of the beam, and the width of the first post-casting strip 102 is reserved between the two adjacent prefabricated slabs;

S3, two prefabricated floor slabs adjacent to each other are directly spliced;

S4. Connect the steel bars of two adjacent prefabricated floors:

The sleeve 2 is connected: two adjacent prefabricated slabs are connected to the sleeve 2 with the connecting bars 11 of the enlarged head 110, and the two enlarged heads 110 are located inside the sleeve 2. Specifically, it may be that the connecting reinforcing bar 11 of one of the prefabricated floor slabs is inserted into a mounting hole 22 of the sleeve 2 such that the enlarged head 110 of the connecting reinforcing bar 11 is located inside the sleeve 2. Thereafter, another prefabricated floor slab is lifted, the enlarged head 110 of the prefabricated floor slab is inserted into the other mounting hole 22 of the sleeve 2, and the enlarged head 110 is placed in the sleeve 2 to realize the adjacent two prefabricated slabs. Preliminary positioning;

S5, supporting the bottom mold on the lower end faces of the first post-casting strip 102 and the second post-casting strip 103;

After the upper prefabricated wall panel 71 is installed above the first post-casting strip 102 and temporarily supported and fixed, the upper wall panel is connected with the reinforcing steel bar protruding from the lower wall panel, and the sleeve 2 may be connected.

Concrete is poured into S6, the first post-casting strip 102 and the second post-casting strip 103, and the concrete also enters the sleeve 2 from the two mounting holes 22 of the sleeve 2 and the grouting holes.

S7. After the concrete in the first post-casting strip 102 and the second post-casting strip 103 is solidified, the wear-resistant layer 172 is cast on the upper surface of the first post-cast strip 102 and the second post-cast strip 103 and sanded or made according to requirements. The finishing layer is provided with a heat insulating layer 173, a fireproof layer 174, and a sound insulating layer 175 on the lower surfaces of the first backing strip 102 and the second backing strip 103.

Embodiment 7: A construction method of a prefabricated floor slab, which differs from the sixth embodiment in that steps S1, S2 and S3 are different, and steps S1, S2 and S3 are as follows:

S1, installing a prefabricated wall panel 71 on the ground;

S2, the prefabricated floor slab is hoisted to the top of the prefabricated wall panel 71. When the width of the first post-casting strip 102 is less than the thickness of the wallboard, the lap joint is directly lapped; when the width is greater than the thickness of the wallboard, the bottom of the prefabricated slab is installed to support and fix the support frame.

S3. Reserve a gap between the second post-casting strips 103 between the two adjacent prefabricated floors.

Introduction of the sleeve structure and its connection method:

The sleeve 2 can be a shrink-type reinforcing bar connecting sleeve and an outer protruding card sleeve.

Shrinking steel connecting sleeve:

As shown in FIG. 35, the neck-type reinforcing steel connecting sleeve comprises a cylinder body 6 and a constriction 61 integrally connected to the two ends of the cylinder body 6. The cylinder body 6 is provided with a plurality of evenly distributed grouting holes 62 for facilitating the inflow of cement slurry. In conjunction with FIG. 36, the constriction 61 is a round mouth, the inner wall of the constriction 61 is a conical surface, and the larger end of the conical surface faces the inside of the cylinder 6; in conjunction with FIG. 37, the constricted rebar connection sleeve The connecting structure is composed of a connecting reinforcing bar 11 and a cylindrical body 6. One end of the connecting reinforcing bar 11 is pre-buried and fixedly connected inside the prefabricated plate 7, and the other end is exposed outside the prefabricated plate 7 and integrally connected with an expanding head 110 at an end portion away from the prefabricated plate 7. The radial dimension of the outer wall of the enlarged head 110 is larger than the radial dimension of the outer wall of the connecting rebar 11 and smaller than the radial dimension of the inner wall of the constriction 61, and the enlarged head 110 can protrude from the constriction 61 into the interior of the cylinder 6.

As shown in FIG. 38, after the cement slurry flows from the grouting hole 62 into the inside of the cylindrical body 6 and solidifies to form concrete, the expanding head 110 can be fixed inside the cylindrical body 6, and the connecting reinforcing bars 11 at both ends of the cylindrical body 6 can be restricted from moving away from each other. The cylindrical body 6 is pulled out in the direction of movement, thereby connecting the prefabricated plates 7 at both ends (the schematic diagram of the rectangular block structure connecting the reinforcing bars 11 away from the end of the cylindrical body 6 to the prefabricated plate 7 in FIG. 38), and between the two prefabricated plates 7 is improved. Connection strength. One end of the enlarged head 110 near the connecting reinforcing bar 11 has a truncated cone shape, and one end of the enlarged head 110 near the prefabricated plate 7 is smaller than the other end; for convenience of description, the conical surface of the constricting opening 61 is defined as a transitional conical surface 611, a constricted portion 61 and a cylindrical body. 6 ends are integrally connected by a transitional conical surface 611. After the connecting rebar 11 is subjected to the force of pulling out the cylinder 6, the round table is pressed against the concrete, and the concrete will squeeze the force (as indicated by the arrow F in Fig. 38). The direction of the direction of the force direction is transmitted to the transitional conical surface 611. The reaction force generated by the transitional conical surface 611 has a radial component force to the expansion head 110, and the expansion head 110 is pressed in the radial direction. Therefore, the transitional conical surface 611 The cylinder 6 and the concrete inside can carry a larger load, and the strength of the connection between the connecting bar 11 and the enlarged head 110 and the barrel 6 can be improved.

Compared with the existing grouting sleeve, the sleeve does not need a separate grouting operation, but when the concrete is poured, the concrete slurry enters the cylinder 6 to complete the connection of the connecting steel bars 11, which is more convenient to operate and does not require special grouting material. ,save costs. In addition, since the solution is transmitted by pressure, the connection is more reliable than the grouting sleeve relies on the bond between the grout and the reinforcing bar.

The shape of the constriction 61 may be a circular shape, or may be a plurality of shapes such as a square shape, an elongated shape, and an elliptical shape, and the cross section of the enlarged head 110 is adapted to the shape of the constricted portion 61. In order to allow the pressure of the expansion head 110 to be efficiently transmitted to the cylindrical body 6 through the concrete, the size of the constriction 61 may be larger than the size of the expansion head 110 by 1 to 5 mm, preferably 2 to 3 mm.

As shown in Figs. 39 and 40, the cylindrical body 6 has a split structure and can be split into two halves in the axial direction. A connecting plate 63 is fixedly connected to the outer surface of the two end portions of the two cylinders 6. The connecting plate 63 is respectively provided with a through hole 631. After the two half cylinders 6 are butt-joined together, the through holes 631 of the connecting plate 63 can be mutually connected. The two connecting plates 63 can be pinned by inserting a pin or a bolt or the like into the two mutually aligned through holes 631 to restrict the two half cylinders 6 from being separated from each other in a direction away from each other.

When the distance between the two prefabricated panels 7 is relatively small, the distance between the end faces of the ends of the connecting reinforcing bars 11 which are embedded in the interior of the prefabricated plate 7 is relatively small, and the cylindrical body 6 can be split into two halves. One half of the cylinder 6 is placed on one of the connecting bars 11, and the other half 6 is sleeved on the connecting bar 11, and finally the two cylinders 6 are placed in the axial direction of the connecting bar 11 and close to each other. The direction of sliding causes the through holes 631 on the connecting plate 63 to be aligned with each other, and the two half cylinders 6 are joined together by the insertion of the pin members into the through holes 631.

As shown in Fig. 41, when the two reinforcing bars in the vertical state are connected, in order to more conveniently temporarily fix the sleeve 2 to the butting position of the two connecting bars 11 before pouring concrete, it is not slipped. Therefore, the central portion of the inner wall of the cylinder 6 is fixed with a baffle member 64 that prevents the enlarged head 110 from penetrating the sleeve 2. The baffle element 64 can be an intermediate wafer plate located in the barrel 6. Further, in order to allow the cement slurry to flow freely within the cylinder 6, the baffle member 64 is disposed in a hollow annular shape having an inner diameter smaller than the diameter of the enlarged head 110. Alternatively, the baffle element 64 may also be a rod disposed in the radial direction of the barrel 6.

Extend into the card sleeve:

As shown in FIG. 42 and FIG. 43, the outer sleeve member includes a cylinder body 6, a latching block 65, and a spring piece 66. Both ends of the cylinder body 6 are provided with a snap hole for inserting the card connector block 65. 651, the barrel 6 is provided with a grouting hole 62. One end of the elastic piece 66 is fixedly connected to the outer side surface of the cylindrical body 6, and the other end of the elastic piece 66 is fixedly connected to one end of the engaging block 65 located outside the cylindrical body 6.

One end of the connecting reinforcing bar 11 is fixedly coupled to the enlarged head 110. The radial dimension of the enlarged head 110 is larger than the radial dimension of the connecting reinforcing bar 11, and the enlarged head 110 can be inserted into the inside of the cylindrical body 6 from the port of the cylindrical body 6. During the insertion process, the expanding head 110 pushes the engaging block 65 to move away from the central axis of the cylindrical body 6 to elastically deform the elastic piece 66. After the expanding head 110 passes over the engaging block 65, the elastic piece 66 gradually recovers and deforms into the cylindrical body 6 The reset restricts the expansion head 110 from pulling out the barrel 6.

When the post-casting belt around the cylinder 6 is poured into concrete, the cement slurry can flow from the two ports of the cylinder 6 and the grouting hole 62 into the inside of the cylinder body 6, and the cement slurry solidifies to form solid concrete, so that the connecting steel bar 11 is fixed in the cylinder body. 6 internal, thereby achieving the connection of the two connecting bars 11.

In addition, it should be pointed out that the sleeve can adopt the four sleeve-related invention patents filed by the applicant on April 8, 2018, and the application numbers are 201810306670.4, 201810307419.X, 201810307420.2 and 201810307967.2, respectively.

The present invention is only an explanation of the present invention, and is not intended to limit the present invention. Those skilled in the art can make modifications without innovating the present embodiment as needed after reading the present specification, but as long as the present invention is in the right of the present invention. All requirements are protected by patent law.

Claims

A prefabricated floor slab, comprising: a floor slab module (1), wherein two opposite circumferential sides of the slab module (1) are fixed with connecting reinforcing bars (11), and the connecting reinforcing bars (11) extend beyond the end of the slab module (1) The portion is fixedly enlarged (110), the size of the enlarged head (110) is larger than the outer diameter of the connecting reinforcing bar (11), and the direction in which the connecting reinforcing bars (11) are disposed is longitudinal.
The prefabricated floor slab according to claim 1, characterized in that the connecting reinforcing bars (11) are partially embedded or lengthwise arranged in the floor module (1).
The prefabricated floor slab according to claim 1, characterized in that the prestressed reinforcing bars (12) are fixed in parallel with the connecting reinforcing bars (11) in the floor slab module (1).
The prefabricated floor slab according to claim 3, characterized in that the prestressed reinforcing bars (12) are arranged at a position close to the upper surface and/or the lower surface of the prefabricated floor slab.
The prefabricated floor slab according to claim 3, characterized in that the end of the prestressed reinforcing bar (12) is arranged as an enlarged head (110).
The prefabricated floor slab according to claim 1, characterized in that a transverse reinforcing bar (13) is arranged in the floor module (1).
The prefabricated floor slab according to claim 1, characterized in that the slab module (1) is provided with a reinforcing mesh frame (14).
The prefabricated floor slab according to claim 7, wherein the reinforcing mesh frame (14) comprises an upper reinforcing mesh (141), a lower reinforcing mesh (142) parallel to the upper reinforcing mesh (141), and an upper reinforcing mesh (141). A support reinforcement mesh (143) is connected between the lower reinforcement mesh (142) and the support reinforcement mesh (143) is vertically fixed between the upper reinforcement mesh (141) and the lower reinforcement mesh (142).
The prefabricated floor slab according to claim 8, wherein the supporting reinforcing mesh (143) is a plurality of trusses arranged parallel to each other, and the truss is oriented in a longitudinal direction.
The prefabricated floor slab according to claim 9, wherein each truss is a continuous triangular-shaped reinforcing mesh, the top is fixed to the upper reinforcing mesh (141), and the bottom is fixed to the lower reinforcing mesh (142).
The prefabricated floor slab according to claim 10, wherein each of the truss continuous triangular structures is welded by a plurality of bent steel bars and two upper and lower long steel bars (1021).
The prefabricated floor slab according to claim 10, characterized in that: the upper apex of a steel bar bent into a triangular structure is fixed to the transverse reinforced bar of the upper reinforcing mesh (141); the traverse of the lower apex and the lower reinforcing mesh (142) The steel bars are fixed.
The prefabricated floor slab according to claim 8, characterized in that all or part of the reinforcing bars of the upper reinforcing mesh (141) and/or the lower reinforcing mesh (142) project beyond the circumferential side of the floor module (1).
The prefabricated floor slab according to claim 13, characterized in that the upper reinforcing mesh (141) and/or the lower reinforcing mesh (142) extend beyond the reinforcing side of the circumferential side of the floor module (1) to form an enlarged head (110).
The prefabricated floor slab according to claim 1, characterized in that the circumferential side of the slab module (1) is pre-buried with a U-shaped steel bar (16) in a vertical direction, and one end of the opening of the U-shaped steel bar (16) is embedded in the floor module. (1) inside.
The prefabricated floor slab according to claim 1, characterized in that the slab module (1) is provided with a plurality of open-ended hollow holes (15) in the direction in which the reinforcing bars (11) are connected.
The prefabricated floor slab according to claim 1, characterized in that the upper surface and the lower surface of the slab module (1) are provided with an integrally formed additional layer structure (17); the upper surface is fixed with a decorative layer (171) and/or wear resistant The layer (172); the lower surface of the floor module (1) is fixed with an insulation layer (173) and/or a fire barrier layer (174) and/or a sound insulation layer (175).
The prefabricated floor slab according to claim 17, characterized in that the upper surface and the lower surface of the slab module (1) are not provided with an additional layer structure (17) at the overlap with the prefabricated wall panel (71) or the cross member.
Prefabricated floor slab according to claim 17, characterized in that the additional layer structure (17) of the floor module (1) is pre-buried in the pipeline.
The prefabricated floor slab according to claim 1, characterized in that the circumferential side surface of the floor slab module (1) is provided with a pre-buried steel plate (181) or a pre-embedded angle iron (182) or a bolt near the bottom surface or a bottom surface thereof near the circumferential side surface. Sleeve (183).
A prefabricated floor slab connection structure, comprising: the prefabricated floor slab according to any one of claims 1-20, wherein a first post-casting strip (102) is reserved between two adjacent prefabricated slabs, adjacent to two The two opposite connecting bars (11) of the prefabricated slabs are connected by a sleeve (2), and the sleeve (2) is provided with a mounting hole (22) adapted to the outer diameter of the end of the enlarged head (110).
The joint structure of a prefabricated floor slab according to claim 21, characterized in that the sleeve (2) is arranged offset in the first post-cast strip (102).
The joint structure of the prefabricated floor slab according to claim 21, wherein the first post-casting strip (102) is further provided with a plurality of long-length reinforcing bars (1021) and a hoop surrounding the plurality of long-length reinforcing bars (1021). Tendon (1022).
The joint structure of the prefabricated floor slab according to claim 22, wherein the side of the adjacent two prefabricated slabs further fixes the auxiliary connecting ribs (19), and the auxiliary connecting ribs (19) extend beyond the ends of the prefabricated slabs to set the hooks. In the portion (191), the long reinforcing bar (1021) passes through a plurality of hook portions (191).
The joint structure of the prefabricated floor slab according to claim 21, wherein the sides of the adjacent two prefabricated slabs are further fixed with U-shaped reinforcing bars (1023), and the long-length reinforcing bars (1021) pass through a plurality of U-shaped reinforcing bars. (1023).
The joint structure of the prefabricated floor slab according to claim 21, wherein the top surface of the precast slab is provided with a decorative layer (171) or a wear layer (172), and the top of the first post-casting strip (102) is provided with a post-cast decorative layer ( 171) or wear layer (172).
The joint structure of the prefabricated floor slab according to claim 21, wherein the first post-casting strip (102) is internally provided with a pre-buried pipeline.
The joint structure of a prefabricated floor slab according to claim 21, wherein two adjacent prefabricated slabs are spliced to each other in a direction perpendicular to the connecting bars (11).
The joint structure of a prefabricated floor slab according to claim 21, characterized in that the adjacent two prefabricated slabs are provided with a second post-casting strip (103) in a direction perpendicular to the connecting reinforcing bars (11).
The joint structure of the prefabricated floor slab according to claim 29, wherein adjacent two prefabricated slabs have reinforcing steel bars extending in a direction perpendicular to the connecting reinforcing bars (11), and the extended steel bars are cast in the second post-casting strip. (103).
The joint structure of a prefabricated floor slab according to claim 30, characterized in that the projecting steel bar is provided with an enlarged head (110), and the reinforcing bars respectively extending from the two prefabricated floor slabs are connected by a sleeve (2).
The joint structure of the prefabricated floor slab according to claim 29, wherein the top surface of the precast slab is provided with a decorative layer (171) or a wear layer (172), and the top of the second post-casting strip (103) is provided with a post-welding decorative layer ( 171) or wear layer (172).
The joint structure of the prefabricated floor slab according to claim 29, characterized in that the second post-casting strip (103) is provided with a pre-buried pipeline.
The joint structure of a prefabricated floor slab according to claim 21, characterized in that the bottom of the first post-casting strip (102) is provided with a steel beam (3) or a precast concrete beam (4).
The joint structure of the prefabricated floor slab according to claim 34, wherein the sleeve (2) is provided with a peg hole (21), and the peg (20) passes through the peg hole on the sleeve (2) ( 21) After welding with steel beam (3).
The joint structure of the prefabricated floor slab according to claim 34, characterized in that the top surface of the precast concrete beam (4) is provided with a pre-embedded U-shaped connecting rib (1025), and the U-shaped connecting rib (1025) is extended into the first Cast in the belt (102).
The joint structure of the prefabricated floor slab according to claim 21, characterized in that the bottom of the first post-casting strip (102) is provided with a prefabricated wall panel (71).
The joint structure of a prefabricated floor slab according to claim 37, wherein the width of the first post-cast strip (102) is greater or smaller than the thickness of the prefabricated wall panel (71).
The joint structure of the prefabricated floor slab according to claim 38, wherein the upper and lower end faces of the prefabricated wall panel (71) or the side near the upper and lower ends are provided with a pre-buried steel plate (181) or a pre-embedded angle iron (182); The pre-buried steel plate (181)/pre-buried angle iron (182) of the slab is welded to the pre-embedded steel plate (181)/pre-buried angle iron (182) of the prefabricated wall panel (71).
The joint structure of the prefabricated floor slab according to claim 38, wherein the upper and lower end faces of the prefabricated wall panel (71) or the side near the upper and lower ends are provided with an embedded bolt sleeve (183); and the fixed angle iron (5) is further included. ), the fixed angle iron (5) is installed at the corner formed by the connection between the prefabricated floor and the prefabricated wall panel (71); after the fixing bolt (51) passes through the fixed angle iron (5), it is screwed into the pre-embedded bolt sleeve (183) .
A construction method for a joint structure of a prefabricated floor slab, comprising the following steps:

S1. The prefabricated floor slab according to any one of claims 1 to 20 is hoisted to the upper end surface of the wall panel or the steel beam (3) or the precast beam, and spread to form a slab, between the two prefabricated slabs adjacent to each other in the longitudinal direction. Forming a first post-casting strip (102);

S2, two adjacent prefabricated slabs with connecting heads (110) of the expansion head (110) are inserted into the sleeve (2), and two enlarged heads (110) are located inside the sleeve (2);

S3. Pour concrete in the first post-casting strip (102) to allow the concrete slurry to flow into the sleeve (2).
The method for constructing a joint structure of a prefabricated floor slab according to claim 41, wherein:

During hoisting, a gap is left between the two adjacent prefabricated slabs as a second post-casting strip (103); the steel bars extending from the lateral peripheral surfaces of the two prefabricated slabs are connected; the second post-casting strip (103) After pouring the bottom mold, pour concrete.
A method of constructing a joint structure of a prefabricated floor slab according to claim 42, wherein:

After the concrete in the first post-casting strip (102) and the second post-casting strip (103) is solidified, the upper surface and the lower surface of the solidified concrete are respectively subjected to a veneer treatment.