JP2002054260A - Pc concrete floor board having hollow hole and manufacturing method therefor and construction method for composite concrete floor using pc concrete floor board having hollow hole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily hang a concrete floor board having a hollow hole when the concrete floor board is constructed and make freshly mixed concrete to flow into an end part of the floor board easily when freshly mixed concrete is placed after hoisting the concrete floor board to solidify the connection of the completed floor board and freshly mixed concrete. SOLUTION: A scraped-off part 13 in which a ridge part on upper sides in both end parts of the PC concrete floor board 10 having the hollow hole is scraped off until it reaches the hollow hole 11 is formed. A dimension in the direction of length of the floor board 10 in the scraped-off part 13 is equivalent to its thickness or 1/5 of the thickness.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hollow concrete PC slab (hereinafter simply referred to as a slab), a method of manufacturing the same, and a method of constructing a composite concrete floor using the slab.

[0002]

2. Description of the Related Art Heretofore, floor boards used for this type of composite concrete floor have end faces formed at right angles to the floor face. Therefore, in the field,
After assembling or constructing a reinforcing bar or a steel frame such as a beam or a wall, in order to suspend the floor panel at a predetermined position, hooks F for lifting are inserted into the hollow holes from both end faces thereof, and the floor panel is suspended by a lifting device. It is crowded. However, since the middle part of the hook protrudes from the end face, this hits the already-assembled reinforcing bar B1, and the hook position is inserted between the reinforcing bars B1. Takes time. Alternatively, the hook may not be able to be pulled out of the floor plate (see FIG. 8). Further, after the floor plate is attached to a predetermined position, when a cast-in-place raw concrete is constructed between the reinforcing bars such as the beams and walls and on the upper surface of the floor plate, the raw concrete is placed between the end surface of the floor plate and the reinforcing bar. In combination with the fact that the floor plate cannot be driven sufficiently and the end surface of the floor plate is at a right angle, there is a tendency that the connection at this portion becomes insufficient and the initial design strength cannot be exhibited.

[0003] On the other hand, in the case of a steel reinforced concrete structure, even when the floor plate is fished in the above-described manner, the hook hits the steel frame B2 in the lateral direction and cannot be fished. Therefore, the wire W is wound around the floor plate, and this is hooked by the hook. Hanging or
Alternatively, the eyeglass bolts for hanging are previously attached to the floorboard and suspended, but the method of winding the wire is to remove the wire and then move the floorboard in the horizontal direction to make close contact with the adjacent floorboard. However, there is a great loss of labor in this operation, and if a lever such as a bar is used for movement, the floor plate itself may be damaged (see FIG. 9). In addition, the method of mounting the eyeglass bolts in advance requires a high mounting cost and a high construction cost as a whole. Therefore, there is a tendency that a composite concrete is hardly adopted in a steel structure.

[0004]

According to the present invention, the above-mentioned hanging work is facilitated and the cast-in-place concrete is formed by making the shape of both ends of the conventional floorboard into a special shape as described above. Is easy to flow into both ends of the floorboard,
The present invention is to provide a manufacturing method which is capable of sufficiently exhibiting design strength, and which does not complicate the production of a floor plate which can achieve the above-mentioned object, and which hardly increases the cost.

[0005]

In order to achieve the above-mentioned object, the present invention is directed to a method of manufacturing a floor plate having a plurality of hollow holes in a longitudinal direction, by forming an edge ridge on an upper surface side after installation at the both ends. A cut-out notch is formed until reaching the hollow hole, and the dimension of the cut-off portion in the length direction of the floor plate is equivalent to this thickness or 1/5 of this thickness. Floor board.

In order to achieve the above object, a related method invention is to form a plurality of hollow holes in parallel in the length direction on a forming bed having a long forming plane.
In the method of forming a floor plate in the length direction, after the floor plate is sufficiently solidified, when cutting the plate to a desired length on the forming bed, the upper side of the hollow hole is positioned at each cut end. Until diagonally or stepwise,
A method of manufacturing a floor plate, characterized in that the dimension of the cut-out notch in the length direction of the floor plate is equal to or greater than this thickness or 1/5 of the thickness.

According to another aspect of the present invention, there is provided a method of using a related object in which a floor plate according to claim 1 is killed after assembling one of a reinforcing bar or a steel frame for a pillar or a beam of a building. With the cut-out notch facing upward, the hook of the lifting device is inserted into the hollow hole from the cut-out notch, and the floorboard is used for the reinforcing bars or steel frames for columns and beams of the building. A first step of suspending and installing the apparatus at a predetermined position thereof and temporarily fixing the apparatus. Next, a second step of removing the hook and placing a raw concrete around one of the reinforcing bars or steel frames, the cut-out notch, and the floorboard surface. The composite concrete including the first and second steps as described above
G floor construction method.

[0008] In order to achieve the above object, another invention of the use of this related object is that, prior to the casting of the raw concrete, each hollow hole has a diameter corresponding to its diameter from the hole end. The method according to claim 3, wherein the plug is fitted with a plug for preventing the flow of raw concrete.

Operation of the Invention The operation of the invention according to claim 1 will be described together with the construction method according to claims 3 and 4 using this. Since the floorboard is configured as described above, when hanging the floorboard, the hooks of the lifting device are inserted into the hollow holes from the killing portions at both ends of the floorboard. In this case, since the dimensions of the killing portion are as described above, the middle portion of the hook does not protrude from the lower ends of the floor plate. Therefore, these hooks can be hung at a position in close contact with an adjacent floor plate without hitting a reinforcing bar or a steel frame at the time of the above-mentioned hanging, and this operation is facilitated.

Next, the floor plate is fixed to a concrete form or the like in the same manner as in the prior art. Then, ready-mixed concrete is cast on the floor plate and on the reinforcing bar portion of the slag or wall portion or the steel frame portion. In this case, the ready-mixed concrete easily and sufficiently flows into the reinforcing steel bar and the steel frame from the killed portion, and a part of the ready-mixed concrete flows into the hollow hole. In the case of the construction method according to claim 4, a plug is provided slightly inside the end of each hollow hole before placing the ready-mixed concrete (including immediately after floor plate production). The cast-in-place concrete is thus solidified, and the floorboard and the slag or wall are integrally formed.

In the manufacturing method according to the second aspect of the present invention, when cutting to a desired length on a molding bed as in the past, the number of cutters to be used only increases. The increase in the amount of depreciation is limited to the increase, and the increase of this degree has the effect of being sufficiently absorbed by the improvement of the work efficiency due to the ease of construction according to the third aspect and the reduction of the work labor.

[0012] In the construction method according to the fourth aspect, the ready-mixed concrete surely flows into the ends of the respective hollow holes, and does not flow more than necessary by the plugs. Only, there is no decrease in the density of this portion, and the effect of further improving the bonding strength is obtained.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 This is shown in FIG. 1 and includes the invention of the first embodiment. Reference numeral 10 denotes a floor plate, which varies in thickness depending on dimensions of a span supported at both ends by beams, walls 22 and the like, and a load placed thereon, and has a normal thickness of 12 cm to 40 cm, and a length of 270 cm to 14 m as appropriate. Although determined by design, they are not limited to these dimensions. The floor plate 10 is provided with a plurality of hollow holes 11 in the shape of a vertical ellipse or a perfect circle in parallel with the length direction, and a PC steel rod 12 is formed on the lower side of the floor plate 10. It is sometimes buried integrally.

When the floor plate 10 is used horizontally, the side where the PC steel bar 12 is embedded is used with the lower side. At both ends of the floor plate 10, the upper ridge line portion in the width direction of the floor plate 10 is formed with a killing portion 13 that has been killed down to the position of the hollow hole 11. The dimension in the length direction is from the thickness of the floor plate 10 to 1/5 of the thickness. Measured dimensions are 10c
m to 20 cm. In short, it is sufficient that the hooks F of the lifting device do not protrude outward from the end surface 15 of the floor plate 10 when the hooks F are inserted into the hollow holes 11. If the length of the killing portion 13 in the length direction is too long, the strength of the floor plate 10 is reduced. This killing part 1
Even if the surface 14 of 3 is a stepped shape, an inclined surface, or an inclined concave curved surface, it is included in the embodiment of the present invention.

Embodiment 2 As a typical embodiment of the method for manufacturing the floorboard 10 according to the invention described in claim 2, as shown in a schematic view of a conventional figure (see FIG. 2), a floorboard forming apparatus is used. A is used. This apparatus A is provided with a movable platform 31 capable of traveling in the longitudinal direction on a long forming bed 30, a hopper 32 for inputting ready-mixed concrete at an upper portion, and a lower portion of the forming bed 30 at a lower portion. Core rod 3 forming hollow hole 11 oriented in the longitudinal direction
3 is cantilevered at the base of the moving table 31 at the base thereof, and the moving table 31 is provided with a forming plate (not shown) for regulating both sides and a ready-mixed concrete placed above the core rod 33 downward. A pressing device 34 for pressing is provided on the movable base 31.
On the other hand, a support 35 for setting the PC steel bar 12 and a pulling device 36 for pulling the support 35 are provided at both ends of the forming bed 30.

First, a desired number of PCs are placed on the molding bed 30.
The steel bar 12 is stretched in the length direction, and a desired tension is applied by the tension device 36. Next, a desired ready-mixed concrete is put into the hopper 32, and put on a core rod 33 between a pair of forming plates (not shown) forming the both side walls. While consolidating the ready-mixed concrete between the spaces 33 and in the formed plate, the movable bar 31 is slowly retracted with the core bar 33 facing backward (see the arrow in FIG. 2), and the floor plate 10 is formed on the formed bed 30. The above method is an example of a conventional general method of manufacturing a floorboard, and is not limited to this method.

When the concrete of the floor plate 10 is sufficiently solidified, the floor plate 10 is cut to a desired length on the forming bed 30 by a conventionally known method, for example, a disk-shaped grinding wheel 37. At this time, the sub-grinding discs 3 having a small half to 4/5 circle of the thickness of the floor plate 10 are provided on both sides of the large-diameter grindstone 37, respectively.
8 and at least one, usually not two, stacked on the same rotating shaft 3
9 is mounted with or without an appropriate spacer disk 40 interposed therebetween, and is cut in the transverse direction by the grinding wheel 37 and the sub grinding wheel 38.
At the same time, the floor plate 10 is completely cut off, and at the same time, on both sides thereof, the sub-grinding wheel 38 is stepped down to form a cut-off portion 13 (see FIG. 3). Therefore, the upper part of the hollow hole 11 is shaved off at the killing portion 13 and the lower half of the hollow hole 11 is formed to be exposed upward.

In the present invention, a plug D for closing each hollow hole 11 made of a synthetic resin molded product, cardboard or corrugated cardboard, a molded product, a metal plate product, or the like is fitted into the inclined or stepped-shaped killing portion 13. It is crowded. The plug D will be described below as a third embodiment.

Third Embodiment FIGS. 6 and 7 show a third embodiment.
The plug D is a leg 5 extending from the peripheral edge 51 of the blocking plate 50 closing the end of the hollow hole 11 of the floor plate 10 in a direction perpendicular to the blocking plate 50.
Four or five 2 are provided, and the leading end of each leg 52 is formed with a hooking portion 53 which is bent outward at a right angle and can be hooked on the end face of the hollow concrete plate. The engaging portions 53 are integrally connected by a common ring 54. Therefore, the engaging portions 53 are not individually provided, and the concrete plate end face 1 is not provided.
5, the entire flat ring 54 forms a continuous engaging portion 53. Of the leg pieces 52, the portion on the killing portion 13 side is short, and the one on the opposite side is long. Therefore, the flat ring 54 is also formed stepwise from the middle according to the shape of the end face of the floor plate 10.

A large number of tongue pieces 55 are inclined from the peripheral edge 51 of the closing plate 50 except for the leg portion 52 by about 20 to 45 degrees from the surface of the closing plate 10 toward the tip end of the leg piece 52. , Protruding outward and formed all around. The size of each tongue piece 57 is preferably 12 mm to 20 mm in length and 10 mm to 15 mm in width, but the size itself has no significance. Each tongue piece 57 is provided almost adjacent except for the adjacent tongue piece 55 and leg piece 52. In this embodiment, since each tongue piece 57 is provided, the hollow hole 1 can be used for a type having a slightly different diameter, and each leg 5
Since the two are connected by the ring 54, each engaging portion 53 is stable, there is no danger of moving by the dynamic pressure of the cast-in-place concrete C, and there is an effect of sufficiently receiving the cast-in-place concrete C. The cast-in-place concrete C is formed in an accurate and uniform shape, and is combined with the concrete plate P.

In the above-described third embodiment, the whole is preferably a synthetic resin molded product (including a recycled synthetic resin molded product and a waste synthetic resin recycled product). It may be integrally molded and solidified from (paper-clay-like) or molded from galvanized iron or tinplate. Alternatively, a material obtained by heating and molding a mixture of a crushed recycled paper and a recycled synthetic resin is not particularly limited.

In addition, if the above-mentioned form is a molded article derived from waste paper, and if water-repellent treatment has been applied, a void plug D is attached, and when the concrete C is cast in place, it is synthesized. In the case where the material is hydrophilic, which is no different from that made of resin, after a while, the cement milk penetrates into the molded article derived from waste paper, and through this, the floor plate 10 and the cast-in-place concrete C are firmly bonded. You can do it.
If the position of the ring 54 is formed by a separate member, it can be provided inside the hollow hole 1, and such a configuration is also included in the embodiment of the invention described in claim 4. All of these molded articles have some flexibility. The length of the shorter leg 52a of the leg 52 is set to 50 mm to 100 mm.

Fourth Embodiment An embodiment of a method for constructing a composite floor according to the third aspect of the present invention using the floor plate 10 will be described. The plug A is previously fitted in each hollow hole 11 or the plug D is fitted in all other hollow holes 11 except for the hollow hole 11 into which the hook F of the lifting device is inserted. Next, the hanging hook F is inserted into the hollow hole 11 without the plug D. Hook F
It is preferable to use at least two pieces at one end of the floor panel 10. At this time, in the present invention,
Because of the above-mentioned killing portion 13, the middle outer surface of each hook F does not project outward from the end surface 15 of the floor panel 10. As shown in FIG. 4 or FIG. 5, the floor plate 10 is suspended on a part of the formwork 20 for forming a beam, a wall, or the like, or a wall surface 21 of a lower floor already constructed. Is fixed.

Thereafter, the hook 20 is removed, and the plug 50 is fitted into the hollow hole 11. Next, ready-mixed concrete C is poured into the floorboard 10 and the formwork 21. As shown in FIG. 6, when the position of the upper leg 12a is formed so as to avoid the apex position as shown in FIG. 6, the floor plate 10 is suspended and the plug D is inserted into all the hollow holes. 11 can be fitted. In this case, the end of the floor panel 10 has a cut-off portion 13 formed at the upper ridge line portion. From this portion, the ready-mixed concrete is used to rebar B1 in the formwork 21 forming beams, walls, and the like, and the floor panel 10 Flows into each hollow hole 11,
They are in close contact with the contact surfaces without forming any gaps (see arrows in FIGS. 4 and 5). The ready-mixed concrete that has flowed into each hollow hole 11 presses the closing plate 50 and each tongue piece 55, and the tongue piece 55 is spread by the dynamic pressure, and presses against the inner wall of the hollow hole 11, and the ready-mixed concrete inside is further hollowed Outflow to the back of the hole 11 is prevented.

In this way, the ready-mixed concrete is solidified, and the floor panel 10 is integrated with the cast-in-place concrete C to form a durable composite floor panel. At both ends, the beam, the reinforcing bar B1 of the wall, and the like are also integrated. Even when the steel frame B2 is used for a beam, a wall, or the like, a sufficient gap is formed between the end of the floor plate 10 and the steel frame B2 by the killing portion 13 so that the fresh concrete C flows in ( 5), the connection between the floor plate 10 and the cast-in-place concrete and the steel frame B2 becomes strong.

[0026]

According to the first aspect of the present invention, since the construction and operation are performed as described above, the hanging work at the time of construction is easy, and after the floor plate is fixed at a desired position, the fresh concrete is poured. When doing, the ready-mixed concrete easily flows into the cast-in-place formwork, such as beams and walls, and the reinforcing bars from the slaying part, and there is almost no possibility that a gap will be formed. A high bond strength between the concrete and the cast-in-place concrete can be formed.

According to the second aspect of the present invention, although the number of grinding wheels for cutting increases, the cutting process is almost the same as that of the conventional example, and the increase in the depreciation cost due to the increase in the number of grinding wheels increases. The floor board manufactured by this method is sufficiently absorbed by the advantages such as ease of use, ease of construction, and increase in bonding strength.

In the construction method according to the third aspect, when the floorboard is thick and heavy, it is possible to suspend the work by hooks using the hollow holes, and particularly in the case of a heavy and heavy floorboard. While hanging by the hook,
The hook can be easily detached because it can be in close contact with the adjacent floor plate and has the above-mentioned killing portion even when the hook is detached after being fixed at a desired position. Further, the ready-mixed concrete can easily flow into the end portion of the floorboard, and the effect of securely connecting the floorboard and the concrete at the site can be obtained. In the method according to claim 4, the ready-mixed concrete that has flowed into each of the hollow holes is also blocked by the closing plate, and can be solidified in a state of a high density to form a strong joint, and prevent unnecessary discharge of the ready-mixed concrete. Has the effect of

[Brief description of the drawings]

FIG. 1 is a side view in which a part of a floor plate is partially omitted in a longitudinal direction.

FIG. 2 is a schematic vertical sectional side view of a floorboard being manufactured by the floorboard forming apparatus.

FIG. 3 is a vertical sectional side view during floor board cutting.

FIG. 4 is a partially longitudinal side view showing a state in which a floor plate is suspended in a reinforcing steel structure.

FIG. 5 is a partially longitudinal side view of a steel structure being suspended from a floor plate.

FIG. 6 is a perspective view of an example of the plug.

FIG. 7 is a semi-longitudinal side view of FIG. 6;

FIG. 8 is a longitudinal sectional side view when a known floor plate is hung on a reinforcing steel structure.

FIG. 9 is a vertical sectional side view when a known floor panel is suspended on a steel structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Hollow hole concrete floor board (floor board) 11 Hollow hole 12 PC steel rod 13 Killing part 14 Surface 15 End face 20 Formwork 30 Forming head 31 Moving table 32 Hopper 33 Core rod 34 Pressing device 35 Supporting device 36 Tension device 37 Grinding stone Board 38 Auxiliary grinding wheel 50 Closing plate 51 Peripheral edge 52 Leg piece 53 Engagement part 54 Ring 55 Tongue piece A Floor plate forming device B1 Reinforcing bar B2 Steel frame C Cast-in-place concrete D Plug plug F Hook

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) B28B 23/06 E04B 1/16 L E04B 1/16 5/38 Z 5/38 E04C 2/50 K F term (Reference) 2E162 CA11 GA01 GB07 4G053 BB03 BE03 BF01 BF03 EA03 EA43 EA47 EB06 4G055 AA01 AC01 AC08 BB05 4G058 GA01 GB02 GC01 GC05 GD13 GF12

Claims (4)

[Claims] 1. At both ends of a PC concrete floor panel having a plurality of hollow holes in a length direction, an edge ridge portion on an upper surface side after installation is killed down to reach the hollow holes. A notched PC concrete, characterized in that a cutout portion is formed, and the dimension of the cut-out portion in the length direction of the PC concrete floor plate is equal to this thickness or 1/5 of the thickness. -Floor boards. 2. On a forming bed having a long forming plane, a plurality of hollow holes are formed in parallel in the length direction.
In a method of forming a concrete floorboard in a length direction,
When the concrete plate is cut to a desired length on the forming bed after the concrete floor plate is sufficiently solidified, the cut end is obliquely or stepwise at each cut end to the hollow hole position. A PC concrete with a hollow hole, characterized in that the dimension of the cut-out cutout portion in the longitudinal direction of the concrete plate is equivalent to this thickness or 1/5 of the thickness. The method of manufacturing floorboards. 3. After assembling one of a reinforcing bar or a steel frame for a pillar or a beam of a building, the PC concrete floor plate having a hollow hole according to claim 1 is cut off with the cutout portion facing upward. From the cut-out notch, the hook of the lifting device is inserted into the hollow hole, and the PC board with the hollow hole is inserted into the reinforcing bar or the steel frame of the building for columns and beams. A first step of suspending and installing at a predetermined position and temporarily fixing it. Next, a second step in which the hook is removed and a raw concrete is cast around the rebar or steel frame, the cut-out notch, and the PC board with the hollow hole. A method for constructing a composite concrete floor including the first and second steps. 4. A method of fitting a plug for preventing leakage of raw concrete into each hollow hole at a position corresponding to the diameter from the end of the hole prior to placing the raw concrete. The method for constructing a composite concrete floor according to claim 3, wherein: