KR100889140B1 - The assembly type hollow slab - Google Patents

Abstract

The present invention relates to a prefabricated hollow slab, and more particularly to a slab in which the hollow center is vertically divided and assembled. Conventional in-site casting methods are mostly hollow slabs with round or rectangular closed hollows, and some of them are precast of box-shaped cross sections vertically divided between hollow or hollow hollows. Hollow slab method connected in parallel. The present invention is to vertically block the center portion of the hollow part in the form of a hollow, circular or square, other polygons in order to assemble such hollow slab in a dynamic and constructionally advantageous and rational way, and precast these blocks After commercialization, they are reassembled in situ to form the original precast hollow slab. In addition, the cross section of the hollow part of the conventional hollow slab is uniformly formed from the edge end to the center part, but the cross section of the prefabricated hollow slab according to the present invention has a widthwise length of the hollow part in order to increase the abdominal cross section at the edge end where the shear force is mainly applied. In order to increase the flange thickness, the width of the hollow part is increased and the length of the height is reduced to increase the flange thickness. As a result, when viewed from the hollow slab longitudinal section or cross section, the hollow sections have a cross-sectional shape in which the height and width of the cross section are tapered in opposite directions. And the part for installing the partition wall is to be the form without the hollow part.

Precast prestressed concrete bridges are assembled using the prefabricated hollow slab member according to the present invention, since the construction of the superstructure of the prefabricated bridges does not require on-site concrete pouring at all, and does not require the installation of copper bars. It can be substantially shortened and can manage the construction quality of the bridge's superstructure exactly as the designer intended. If the superstructure of the bridge is lost due to natural disaster, the slab slab can be recovered quickly and simply. In addition, there is an advantage that it is very useful when constructing or repairing bridges in high traffic areas or high flow areas. Furthermore, the prefabricated hollow slab member according to the present invention fully utilizes the advantages of the hollow slab which can reduce the slab weight and reduce the thickness of the cross section, while hoop tension when curing concrete around the hollow section. There is a great effect to solve the problem of the conventional closed hollow slab in which the crack occurs by.

Description

Prefabricated hollow slab and method of constructing it {THE ASSEMBLY TYPE HOLLOW SLAB}

1 and 2 show the structure of a precast concrete beam with a closed hollow part according to the prior art;

Figure 3 is a cross-sectional view showing a schematic view of a prefabricated hollow slab according to an embodiment of the present invention

FIG. 4 is a perspective view illustrating a hollow slab member shown in FIG. 3 arranged side by side.

Figure 5 is a cross-sectional view showing a schematic view of a prefabricated hollow slab according to another embodiment of the present invention

FIG. 6 is a perspective view illustrating a hollow slab member shown in FIG. 5 arranged side by side.

Figures 7a and 7b respectively show that the hollow portion of the hollow slab member has a cross-sectional shape tapered from the end of the trunk to the center of the trunk in accordance with a preferred embodiment of the present invention.

8 is a view showing a conceptual diagram of a prefabricated hollow slab according to the present invention

<Description of the symbols for the main parts of the drawings>

10 hollow hollow slab member 20 upper flange

30: lower flange 40: abdomen

50: recess 60: diaphragm

70: shear key 110,120,130,140,150: sheath tube

111,121,131,141,151: Tendon

The present invention relates to a prefabricated hollow slab, and more particularly, to a slab and a method of constructing a vertically divided and assembled hollow center.

Conventional in-site casting methods are mostly hollow slabs with round or rectangular closed hollows, and some of them are precast of box-shaped cross sections vertically divided between hollow or hollow hollows. Hollow slab method connected in parallel.

The present invention is to vertically block the central portion of the hollow part in the form of a hollow, round or square, or other polygons in order to assemble such hollow slab in a dynamic and constructionally advantageous and rational way, and precast these blocks After commercialization, they are reassembled in situ to form the original precast hollow slab.

In addition, the cross section of the hollow part of the conventional hollow slab is uniformly formed from the edge end to the center part, but the cross section of the prefabricated hollow slab according to the present invention has a widthwise length of the hollow part in order to increase the abdominal cross section at the edge end where the shear force is mainly applied. In order to increase the flange thickness, the width of the hollow part is increased and the length of the height is reduced to increase the flange thickness. As a result, when viewed from the hollow slab longitudinal section or cross section, the hollow sections have a cross-sectional shape in which the height and width of the cross section are tapered in opposite directions. And the part for installing the partition wall is to be the form without the hollow part.

In other words, the prefabricated hollow slab member according to the present invention is divided into longitudinally divided blocks in the form of a circular, rectangular, or other polygonal hollow at the center, thereby reducing the weight of the slab and making the thickness of the cross section thin. The present invention relates to a prefabricated hollow slab which fundamentally solves a problem in which cracking is easily caused by hoop tension during concrete curing in a conventional closed hollow portion while still utilizing the advantages of the hollow slab.

In general, bridges are superstructures that transmit loads, such as vehicles and people, to the undercarriage, shifts that support the superstructures at locations connected with road parts, and are located in the middle of the shifts to support the superstructures and base the loads. It consists of a piers delivered to the ground. Typically the superstructure of the bridge consists of individual components of the slab, girder, stringer and cross beam, or only in situ slab. In general, the method of synthesizing the bottom plate (bridge slab) of the bridge to the concrete girder is by manufacturing the girder as a precast factory, transporting it to the site, mounting it on the pier, and constructing the slab with cast-in-place concrete on the top. The latter is done by installing slabs on site and installing slabs on site.

By the way, the conventional slab construction methods by the above-described site casting has the following problems.

First, it takes considerable time to build and cure concrete at the construction site of the bridge, so the construction period of the bridge is prolonged.

Second, due to the concrete site casting, it is difficult to accurately manage the construction quality of the slab according to the specifications required by the designer.

Third, the former method has a problem that the behavior of each member such as the upper slab and the girder cannot be structurally integrated, and the latter method causes trouble in traffic communication and running water due to the construction of Dongbari. In addition, it is difficult to secure the safety of the copper member which must support heavy weight during construction.

Fourth, in the case of closed hollow slab, there is a fatal problem that cracking is likely to occur due to hoop tension during concrete curing.

Regarding such a cast-in-place slab having a closed hollow portion as described above, Patent Application No. 10-2003-23804 filed April 15, 2003 (Sampyo Co., Ltd.) discloses the structure of a precast concrete beam. As clearly shown in Figures 1 and 2, the patent application is used in the construction of the bridge, the interior of the precast concrete beam consisting of a space portion and the tension material is installed in the lower, a plurality of protrusions are formed on the side of the beam The lower portion of the beam formed with the projections is characterized in that the locking step is provided so that the formwork used when placing the cast-in-place concrete can be installed.

However, since the patent application of Sampyo Co., Ltd. is made of a closed hollow part as shown in FIG. 1, cracks due to hoop tension are likely to occur around the hollow part during concrete curing as in the conventional art. Has a fatal problem, and since the cast-in-place concrete is used as shown in Fig. 2, it takes a considerable time to pour and cure the concrete, and thus the construction period is prolonged, and the construction quality of the slab due to the cast-in-place It still does not overcome the conventional problem that it is difficult to accurately manage the system according to the specifications required by the designer.

The present invention was created to solve the problems of the conventional cast-in-place bridge superstructure having a closed hollow portion as described above, by blocking the central portion of the hollow, circular, rectangular or polygonal shape by vertical division, and block After precast (precast) to produce a product, and then assembled again in the field to form the original precast hollow slab. These blocks may be divided in the transverse direction for easy handling such as transportation and assembly, and the prefabricated hollows formed in the shape of the cross-sections in which the widths and heights of the hollows are tapered opposite to each other from the ends of the edges to the centers of the edges. It becomes a slab. Therefore, the present invention overcomes the disadvantage that cracks occur due to hoop tension around the hollow part during concrete curing in the prior art having a closed hollow part while reducing the weight of the slab and thinning the thickness of the cross section. The advantage of the slab is to actively use, and the upper structure of the bridge is completed by simply connecting and assembling the vertically divided block members of the hollow slab according to the present invention with a plurality of tension members, so that no concrete pouring is required at the site, which is environmentally friendly. In this regard, the aim is to be able to quickly cope with the urgent restoration of bridges in areas where the superstructure of the bridge has been lost due to natural disasters, and to prevent direct or indirect economic losses by substantially shortening the construction period.

In order to achieve the above object, the present invention is used as a superstructure of the prefabricated bridge, in the prefabricated hollow slab member having a hollow portion of a circular, square or polygonal shape, the hollow slab member,

A plurality of first sheath tubes longitudinally installed in the lower flange, a plurality of first tension members inserted into the first sheath tube and prestressed;

A plurality of second sheath tubes disposed transversely at the diaphragm site, a plurality of second tension members inserted into the second sheath tubes and prestressed;

And a concave portion which forms a hollow portion between the hollow slab members by vertically dividing the central portion of the hollow portion having a circular or polygonal shape by vertical division, and assembling the blocked members in parallel.

The prefabricated hollow slab member provides a prefabricated hollow slab, characterized in that the hollow portion is vertically divided to have a block shape divided in the longitudinal direction.

According to yet another embodiment of the present invention, a plurality of third sheath tubes are installed longitudinally on the upper flange and a plurality of agents inserted into the third sheath tube and are prestressed. 3 Provide a prefabricated hollow slab characterized in that it further comprises a tendon.

In addition, according to another embodiment of the present invention, in order to ensure that the slab has a reasonable two-way plate behavior and to lower the height of the hollow slab member while maintaining the rigidity of the superstructure, within the upper flange of the hollow slab member The hollow slab member further includes a plurality of fourth sheath tubes installed transversely and a plurality of fourth tension members inserted into and tensioned into the fourth sheath tube. And a plurality of fifth sheath tubes installed transversely in the lower flange of the fifth tensioner and a fifth tensioner inserted into and prestressed into the fifth sheath tube. It provides a prefabricated hollow slab.

According to still another embodiment of the present invention, since the shear force is large at both ends of the trunk and the bending moment is small in view of the structural basic concept, the hollow portion at the end of the trunk has an abdominal cross section by reducing the widthwise length and increasing the heightwise length. As the center part of the center has a small shear force and a large bending moment, the hollow part of the center part increases the thickness in the height direction and increases the width direction in contrast to the end part, thereby increasing the thickness of the flange. It provides a prefabricated hollow slab characterized in that the cross-sectional shape having a cross section advantageous for bending moment resistance.

According to another embodiment of the present invention, a shear key may be provided at a lateral or / and longitudinal connection portion of the hollow slab member according to the present invention, wherein the shear key is formed in a shape in which a recess and a convex are mutually coupled or an epoxy bond. It provides a prefabricated hollow slab characterized in that it is made.

In addition, according to another embodiment of the present invention, there is provided a prefabricated hollow slab, characterized in that it further comprises a hollow portion of the prefabricated hollow slab and a plurality of external tendons disposed outside.

According to another embodiment of the present invention, when the principal is long and the long distance is not easy to carry and handle, the block is divided into both longitudinal and transverse directions so as to have a length within a range capable of carrying the vehicle. It provides a prefabricated hollow slab characterized in that.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

FIG. 3 is a schematic cross-sectional view of a prefabricated hollow slab member according to a preferred embodiment of the present invention, and FIG. 4 is a perspective view illustrating a state in which the prefabricated hollow slab longitudinally divided blocking members of FIG. 3 are arranged side by side. to be.

As shown in FIG. 3, unlike conventional concrete cast-in-place hollow slab plates with closed hollow sections of round, square or polygonal shape, the prefabricated hollow slab 10 according to the present invention has a circular, square or polygonal shape. The central part of the hollow part is divided into vertical blocks, and the block is precast, manufactured and commercialized, and then assembled again in the field to form the original precast hollow slab. In other words, the prefabricated hollow slab longitudinally divided blocking member according to the present invention has an upper flange 20, a lower flange 30, an abdomen 40 located between the upper flange 20 and the lower flange 30, and a continuous And a concave portion 50 forming a hollow portion between adjacent longitudinally divided blocking members arranged.

In addition, the lower flange 30 of the prefabricated hollow slab member 10 includes a plurality of first sheath tubes 110 installed in a longitudinal direction and a plurality of first tension members inserted into and tensioned therein. 111 are arranged in the diaphragm 60 of the hollow slab member, and a plurality of second sheath pipes 120 are installed in the transverse direction and inserted into the second sheath pipes to prestress. A plurality of second tension members 121 are disposed so that the longitudinally divided hollow slab members can be connected to each other in the transverse direction. The diaphragm 60 may be installed at both ends of the hollow slab member divided according to the present invention, but may be installed in the middle portion of the hollow slab member according to the designer's intention in consideration of the load condition.

In addition, the prefabricated hollow slab member 10 of the present invention includes a plurality of third sheath tubes 130 installed longitudinally on the upper flange 20 according to the needs of the designer, and the third sheath tubes. A plurality of third tension members 131 inserted into and prestressed may be additionally installed. Furthermore, a plurality of external tendons may be additionally disposed in the hollow portion and the exterior of the prefabricated hollow slab as needed. It may be done. At this time, the outer tension member does not need to be installed in the sheath tube.

In addition, as shown in Figures 3 and 4, a shear key 70 is provided in the transverse connection between the hollow slab members in accordance with the present invention can bear the shear force. The shear key 70 may be used in any known manner that can perform the function of the shear key, but according to a preferred embodiment of the present invention is made of a concave portion and a convex portion is bonded to each other or made of an epoxy bond Is preferred. In addition, the shear key 70 according to the present invention may be installed when the hollow slab member is manufactured in advance in the factory, but may be replaced by the uneven work in the construction site after sufficient structural review according to the designer's intention.

Therefore, the shear force generated between the slab members generated by the dead load and the live load is covered by a shear key provided at the connection portion of the hollow slab member according to the present invention. Here, the connecting portion of the slab member to which the shear key is installed according to the present invention is the upper and lower flange side connection portion or the partition side connection portion.

Therefore, the entire bridge behaves integrally by the action of the tension and shear key of the tension members (tendon) installed in the hollow slab member according to the present invention. As a result, the upper flange of the hollow slab member according to the present invention acts as a plate, and in the longitudinal direction, the tension member installed in the flange of the slab member is tensioned to adjust the overall stress acting on the mold and increase the rigidity. By substantially lowering the sentence, the economical and structurally stable, minimizing the work on the site, it is possible to build economical and durable prefabricated bridges.

The prefabricated hollow slab member 10 according to the invention pre-positions a plurality of longitudinal sheath tubes in the flange portion, inserts a plurality of tendons into it and before or during concrete pouring It is produced by introducing tension later. The prefabricated hollow slab member 10 fabricated in this manner is carried to the bridge construction position and arranged side by side in accordance with the cross-interpolation connection position, and then a plurality of agents installed transversely at the diaphragm 60 of the hollow slab members. By inserting a plurality of second tension members 121 into the two sheath tubes 120 as if beading and introducing a tension force, the hollow slab members according to the present invention to be integrally in the transverse direction and at the same time the bridge superstructure Maintain rigidity as

That is, the construction sequence of the prefabricated bridge using the prefabricated hollow slab member 10 according to the present invention is as follows.

1. Formwork for the production of split blocks is to be produced in the workshop, such as a factory or construction site.

2. Place the sheath tube and reinforcing bar in the formwork. At this time, it is not used much, but it can also be tensioned by inserting a longitudinal tension member into the sheath pipe installed in the longitudinal direction (pretension method).

3. Cast and cure concrete.

4. Insert the longitudinal tension member into the longitudinally mounted sheath pipe and tension it (if a tension is introduced step by step, only the tension is applied to the slab weight that is initially fixed).

5. Transport to temporary location. Processes 4 and 5 can be interchanged.

6. Mount the split block in parallel.

7. Insert tension member into sheath pipe installed transversely to bulkhead or upper and lower flanges.

8. In case of tension in stages, introduce tension for live and secondary fixed loads (longitudinal tension members).

9. Install barriers, guardrails, and sound barriers for secondary fixed loads.

10. Asphalt pavement (may not be used for concrete pavement).

The process of introducing the tension force to the tension member of the hollow slab member according to the preferred embodiment of the present invention described above may be performed simultaneously for all fixed loads and live loads at the same time, but according to the intention of the designer It may be made in sequence by dividing into several stages by generation stage. For example, in the latter case, the process of introducing tension to each tension member of the hollow slab member 10 is a first step of inserting and tensioning the longitudinal tension member only with respect to the weighted primary fixed load of the slab members. And, after being transported to the temporary site and mounted in parallel, the second step of tensioning the transverse tension member into the sheath pipe installed transversely on the partition wall or the upper and lower flanges, and the barrier wall, the guard rail and the soundproof wall. This is the third step of tensioning the longitudinal tension member against the secondary fixed and live loads.

Figure 5 shows a schematic cross-sectional view of a prefabricated hollow slab according to another preferred embodiment of the present invention, Figure 6 is a perspective view showing the hollow slab members of Figure 5 arranged side by side. The hollow slab members shown in FIGS. 5 and 6 are somewhat different from the embodiments shown in FIGS. 3 and 4 in that prestress is applied to both the upper flange and the upper and lower flanges.

That is, the hollow slab member shown in FIG. 5 has a top flange of the hollow slab member in order to keep the slab in reasonable two-way plate behavior and to lower the height of the slab member while maintaining the rigidity of the superstructure of the bridge. A plurality of fourth sheath tubes 140 installed transversely in the 20 and a plurality of fourth tension members 131 inserted into the fourth sheath tubes and prestressed; In addition, a plurality of fifth sheath tubes 150 installed transversely in the lower flange 30 of the hollow slab member 10 and the fifth sheath tube are inserted into the prestress. And a fifth tension member 151 to be added.

The shear force between the hollow slab members according to another embodiment of the present invention shown in FIGS. 5 and 6 is not only burdened by a shear key provided at the connection portion of the slab members into which the tension force is introduced, but also the top or top of the slab members. Prestress is applied to the transverse tensions installed in the lower flange and / or to increase the binding force between the slab members to maintain the rigidity of the bridge's upper structure in two-way plate theory. Therefore, when the overall structure of the upper structure of the bridge is applied to the tension force (tendon) arranged in both the longitudinal and transverse direction, the entire bridge becomes a more economical and structurally reasonable structure.

That is, in the embodiment shown in FIGS. 5 and 6, a plurality of tension members transverse to the upper or / and lower flanges of the prefabricated hollow slab members can substantially reduce the thickness of the slab and reduce the fixed load of the bridge. The installation and tension of the slab removes the amount of tensile stress that may occur in the slab's parent section, and determines the position of the tension member and the magnitude of the tension that can be adjusted so that the stress of the slab after tension is within the allowable stress. The tension material installed in the tension is integrated.

The process of introducing tension to the slab member according to the embodiment shown in FIGS. 5 and 6 simultaneously, for all fixed loads and live loads, at the same time as described in connection with the embodiment of FIGS. 3 and 4 above. It may be made, but may be made sequentially by dividing the load into several stages according to the designer's intention.

According to another embodiment of the present invention, both ends of the trunk have a large shear force but a small bending moment, and a center of the trunk has a large bending moment but a small shear force according to the structural basic concept. Therefore, in view of the structural basic concept, as shown in Figs. 7a and 7b, the hollow portion 30 of the hollow slab member at both ends of the trunk is abdominal by reducing the length in the width direction and increasing the length in the height direction The cross section is increased to have a cross section advantageous for shearing force, and the hollow part of the center part in the middle part of the trunk is reduced in length in the height direction and increases in the width direction as opposed to the end part, thereby increasing the thickness of the flange to increase the bending moment resistance. By having the hollow part according to the present invention configured as a side face having an advantageous cross section, it is possible to have a cross section of a mechanically advantageous shape having a three-dimensional solid hollow part during assembly. The hollow portion made of the tapered edge section, when manufacturing the slab member according to the present invention in a factory or a field, by installing a mold such as a pipe having a cross-sectional shape in advance and then curing the concrete, thereby obtaining a desired shape easily Can be. Fig. 7A shows the hollow portion having an edge section tapered to the center portion of the trunk at both ends of the trunk to have an oval shape, and Fig. 7B shows the hollow portion having a polygonal shape tapered to the center portion of the trunk at both ends. Although shown, other known shapes that can perform the same function may be used. Figure 8 also shows a conceptual diagram of the prefabricated hollow slab according to the present invention so that the present invention can be more clearly understood.

According to another embodiment of the present invention, a plurality of external tendons may be disposed on the hollow portion and the outside of the hollow slab after sufficient structural review according to the intention of the designer. At this time, the outer tension member does not need to be separately installed in the sheath pipe.

The preferred embodiments of the present invention described above are mainly applied to short span bridges with no particular difficulty in carrying the hollow slab members according to the present invention as relatively short spans, ie the slab members according to the present invention in the longitudinal direction. The case where only division is made to be blocked is described. For example, when used in the case of a bridge that is located close to the bridge construction site, or a bridge having a distance that can be transported by the vehicle or the like, even if the hollow slab member according to the present invention is divided only in the longitudinal direction This becomes a possible block form. The hollow slab member according to the present invention, which is divided only in the longitudinal direction, may be made within a range that can be transported by a vehicle, but is not particularly limited, for example, up to 14M in length.

Unlike the hollow slab member which is divided only in the longitudinal direction as described above, according to another embodiment of the present invention, when the principal is long and the long distance is not easy to transport and handle, the hollow slab member has both longitudinal and transverse directions. It may be made in the form of a block divided into. Therefore, when the span is installed on a relatively large bridge, the hollow slab member according to the present invention is divided into a plurality of slab members blocked not only in the longitudinal direction but also in the transverse direction, manufactured at the factory and transported to the site, and thus manufactured in advance. By assembling the plurality of slab members in the longitudinal and transverse directions as if they are beaded, the superstructure of the bridge can be manufactured quickly and easily.

Thus, when connecting the hollow slab member divided not only in the longitudinal direction but also in the transverse direction in the longitudinal direction, a cross beam or a diaphragm is provided in the longitudinal connection portion, and the vertical tension member in the longitudinal direction of the slab member. Tendons are installed so that the slab members are fastened and assembled also in the longitudinal direction. In addition, a shear key may be provided at the longitudinal connection as well as the lateral connection of the slab member so as to sufficiently resist the shear force.

As discussed above, the precast prestressed concrete bridges assembled using the prefabricated hollow slab members according to the present invention do not require on-site concrete pouring when installing the superstructure of the prefabricated bridges, and do not require the installation of copper bars. In addition, the construction period of the bridge is substantially shortened, and the construction quality of the upper structure of the bridge can be managed exactly as the designer intended. In the case where the upper structure of the bridge is lost due to natural disaster, the bridge can be quickly and simply It is possible to recover the slab from the top, and it is very useful for the construction and reconstruction of bridges in high traffic areas or high flow areas.

In addition, the prefabricated hollow slab member according to the present invention, while fully utilizing the advantages of the hollow slab that can reduce the weight of the slab and the thickness of the cross section, while the hoop tension when curing concrete around the hollow section There is an advantage to solve the problem of the conventional closed hollow slab is cracking occurs.

Furthermore, the hollow slab member according to the present invention is introduced into a structural dynamic concept, so that the hollow slab member is formed in the form of a cross section tapered from the center of the trunk to the end of the trunk, thereby exhibiting a structurally advantageous cross-sectional effect to reduce the slab plate thickness It has the advantage of being substantially thinner than the slab plate thickness according to the prior art, it can be easily installed in the work space that must ensure the maximum space of the mold, and minimize the work in the field to create an economical and durable prefabricated bridge It has the advantage of being able to build quickly and simply.

The present invention having the configurations and effects described above can be modified in various ways, and the above description is not intended to limit the scope of the present invention. Accordingly, various modifications and variations are possible without departing from the spirit and scope of the invention, and modifications apparent to those skilled in the art to which the invention pertains are included within the scope of the following claims.

Claims (12)

Used as a superstructure of the prefabricated bridges, the prefabricated hollow slab member having a hollow portion of a circular, square or polygonal shape, the hollow slab member is a hollow portion is divided vertically, A plurality of first sheath tubes 110 installed longitudinally on the lower flange 30 and a plurality of first tension members 111 inserted into and prestressed into the first sheath tubes; Wow, A plurality of second sheath pipes 120 installed transversely at the diaphragm 60, a plurality of second tension members 121 inserted into the second sheath pipes and being prestressed; , And a concave portion 50 which vertically divides the central portion of the hollow portion having a circular or polygonal shape to block in the longitudinal direction, and forms the hollow portion between the hollow slab members by assembling the blocked members in parallel. The prefabricated hollow slab member 10 is formed in a block shape in which the central portion of the hollow part is vertically divided and divided in the longitudinal direction. The hollow portion of the hollow slab member has a hollow cross section in which the abdominal thickness is increased by reducing the widthwise length at both ends of the trunk and increasing the height in the height direction, and at the center of the trunk, as opposed to the ends, Hollow slab of prefabricated bridges, characterized in that the cross-section has a hollow cross-section with a thicker upper and lower flange thickness by increasing the width in the width direction and reducing the length in the height direction. 2. A plurality of third sheath tubes (130) installed longitudinally on the upper flange (20) and a plurality of prestressed inserts into the third sheath tubes (100). 3) Prefabricated hollow slab, characterized in that it further comprises a tension member (tendon, 131). 3. A plurality of fourth sheath tubes (140) installed transversely in the upper flange (20) of the hollow slab member (10) and inserted into the fourth sheath tubes. Prefabricated hollow slab, characterized in that it further comprises a plurality of fourth tension (tendon, 141) that is prestressed The method of claim 3, wherein the plurality of fifth sheath pipes 150 installed transversely in the lower flange 30 of the hollow slab member and inserted into the fifth sheath pipes are prestressed. Prefabricated hollow slab, characterized in that it further comprises a plurality of fifth tension material (tendon, 151) delete 2. The prefabricated hollow slab according to claim 1, wherein a shear key (70) is provided at a lateral connection of the hollow slab member (10). 8. The prefabricated hollow slab of claim 6, wherein the shear key (70) is formed in such a manner that the concave portion and the convex portion are coupled to each other. 7. The prefabricated hollow slab of claim 6, wherein the shear key (70) is epoxy bonded. The prefabricated hollow slab according to any one of claims 1 to 4, wherein a plurality of external tendons are additionally provided at the hollow portion and the exterior of the prefabricated hollow slab. 5. The prefabricated hollow slab according to any one of claims 1 to 4, wherein the hollow slab member is formed in a block form divided in both longitudinal and transverse directions. Manufacturing a prefabricated hollow slab member 10 according to any one of claims 1 to 4, A step of introducing a tension force to each tension member of the hollow slab member 10, the first step of inserting and tensioning the longitudinal tension member only for the weighted primary fixed load of the slab members; A second step of tensioning the transverse tension member by inserting the transverse tension member into the sheath pipe installed transversely to the partition wall or the upper and lower flanges after being transported to the temporary site and mounted in parallel; Construction method of prefabricated hollow slab, characterized in that the third step of tensioning the longitudinal tension member against secondary fixed loads and live loads such as barriers, guard rails and sound barriers Manufacturing a prefabricated hollow slab member 10 according to any one of claims 1 to 4, Wherein the step of introducing a tension force to each tension member of the hollow slab member 10, The step of introducing the tension force, the construction method of the prefabricated hollow slab, characterized in that made at the same time for all the fixed load and live load at the same time

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