KR102462655B1 - Prefabricated bridge for bending moment mitigation of upper slab - Google Patents

Abstract

The present invention provides a prefabricated bridge for reduced bending moment of an upper slab, which can reduce the bending moment of an upper slab to increase the safety of a prefabricated bridge and prevent scour to prevent falling and provide waterproofing and integrity between precast members. According to a proper embodiment of the present invention, the prefabricated bridge is assembled with precast members of a bottom slab arranged on the bottom side of a river, sidewalls erected on both sides of the bottom slab, and an upper slab supported on the upper end of both sidewalls. Protruding parts for bending moment reduction, which protrude from outer walls of the sidewalls at predetermined intervals, are provided on both ends of the upper slab, and brackets for connection slab mounting, which protrude from the outer walls at predetermined intervals to mount connection slabs, are formed on an upper portion of both sidewalls. One end of a tendon for bending moment reduction is connected to a burying coupler buried in the brackets for connection slab mounting to reduce the bending moment acting on the upper slab to apply a tensile force and then the other end of the tendon is fixed on the protruding parts for bending moment reduction.

Description

Prefabricated bridge for bending moment mitigation of upper slab

The present invention relates to a prefabricated bridge, in particular, to relieve the bending moment acting on the upper slab to increase the safety of the prefabricated bridge, to prevent scouring to prevent overturning, and to exhibit the integrity and index effect between precast members. It relates to a prefabricated bridge that relieves the bending moment of the upper slab.

In general, bridges installed in small rivers such as streams, valleys, and streams are small bridges of short span. A girder bridge formed by installing a bridge deck is used. In the case of the Ramen Bridge, the process of installing formwork, pouring concrete, and curing is required at the site, which results in a long period of time and requires a lot of work personnel and subsidiary materials due to the installation of copper bars. there is a problem. In the case of a girder bridge, maintenance of the girder is required, sufficient curing time of concrete is required due to on-site casting of piers and upper slabs, and economical efficiency is also deteriorated. Therefore, on-site casting is unnecessary and a bridge with easy assembly and construction is required. Here, the upper slab of the bridge needs reinforcement because it receives bending moment as well as shear load.

As a background technology of the present invention, as Korean Patent Registration No. 10-1653803 (Patent Document 1), a 'small river prefabricated bridge' has been proposed. This reduces construction costs by quickly prefabricating a small river bridge within a few days, and assembling between factory-made precast concrete members is connected with steel wires at the site and then integrally connected through a main bar and a coupler to ensure high quality and secure cohesion. was made to be able to obtain In this background art, the upper slab of the bridge has improved flexural rigidity by the steel wire to which the tensile force is applied. In this case, there is a limit to the ability of the steel wire to relieve the bending moment acting on the upper slab.

Korean Patent Registration No. 10-1653803

The present invention relieves the bending moment of the upper slab that increases the safety of the prefabricated bridge by alleviating the bending moment acting on the upper slab, prevents overturning by preventing scouring, and relieves the bending moment of the upper slab so that the integrity and index effect between the precast members can be exhibited. The purpose is to provide a prefabricated bridge.

According to a suitable embodiment of the present invention, it is assembled with precast members of a floor slab disposed on the river bottom side, side walls erected at both ends of the bottom slab, and an upper slab supported on upper ends of both side walls. In the prefabricated bridge, the upper slab is provided with protrusions for relieving bending moment protruding a certain amount from the outer wall of the side wall at both ends, and at the same time, the upper part of both side walls is connected by a certain amount protruding from the outer wall to mount the connecting slab, respectively A bracket for mounting the slab is formed; In order to relieve the bending moment acting on the upper slab, one end of the tension member for bending moment relief is connected to the embedded coupler embedded in the bracket for mounting the connection slab to apply a tensile force, and the other end is fixed to the protrusion for bending moment relief. characterized in that

According to another suitable embodiment of the present invention, a central wall disposed on the river bottom, left and right bottom slabs coupled to the lower portion of the central wall, a side wall installed at the end of the bottom slab, and both side walls and precast members of the upper slab supported on the upper end of the central wall in the prefabricated bridge, wherein the upper slab is provided with protrusions for relieving bending moment protruding by a certain amount from the outer wall of the side wall at both ends, respectively, at the same time Connection slab mounting brackets protruding a certain amount from the outer wall are formed on the upper part of the side wall to mount the connection slabs, respectively; In order to relieve the bending moment acting on the upper slab, one end of the tension member for bending moment relief is connected to the embedded coupler embedded in the bracket for mounting the connection slab to apply a tensile force, and the other end is fixed to the protrusion for bending moment relief. characterized in that

According to another suitable embodiment of the present invention, two central walls spaced apart from each other and disposed on the river bottom side, left and right bottom slabs and central floor slabs coupled to the lower part of the central wall, and the left and right bottoms In a prefabricated bridge assembled with precast members of a side wall installed at the end of a slab, an upper slab supported on both side walls and the upper end of the central wall, and precast members of the central upper slab, the upper slab has side walls at both ends A connecting slab mounting bracket that protrudes a certain amount from the outer wall to mount the connecting slab is formed on the upper portions of both side walls at the same time as the protrusion for relieving bending moment protruding from the outer wall of the wall by a certain amount; In order to relieve the bending moment acting on the upper slab, one end of the tension member for bending moment relief is connected to the embedded coupler embedded in the bracket for mounting the connection slab to apply a tensile force, and the other end is fixed to the protrusion for bending moment relief. characterized in that

In addition, the tension member for relieving bending moment is characterized in that it is made of any one of the connecting steel material of a steel wire, a steel bar, and a reinforcing bar.

In addition, the connection between all precast members is characterized in that any one of a steel wire, a steel bar, and a reinforcing bar is used, but the connection steel is tensioned to achieve integration.

In addition, in order to reduce the cross section of the upper slab, it is characterized in that the upper slab steel wire is embedded in the upper slab in the longitudinal direction to introduce tensile stress.

In addition, the assembly between all precast members is characterized in that the protrusion key and the keyway are combined, and non-shrinkable mortar is injected between the protruding key and the keyway space to be integrated.

In addition, the precast member and the precast It is characterized in that the water-repellent material is attached in two rows between the members, the sealant is pre-filled therebetween, and the steel wire is tensioned so that the water-repellent material and the sealant are compressed to fill the gap between the members.

In addition, the central wall is characterized in that the lower part is integrated with the floor slab through the combination of the key and the connecting steel tension to independently support the load.

In addition, after placing a scour prevention beam in the downstream part of the floor slab and joining it to the floor slab by tension of the floor slab steel wire, after filling the back side of the scour prevention beam with rubble, concrete is poured into the space between the scour prevention beam and the floor slab. It is characterized in that it is configured so that there are no voids.

According to the prefabricated bridge that relieves the bending moment of the upper slab of the present invention, by connecting the end of the upper slab to the connecting steel that exerts tensile force, a moment in the opposite direction to the bending moment acting on the upper slab is generated and the bending moment is relieved. The safety of prefabricated bridges is increased.

In addition, a scour prevention beam is installed in the downstream part of the floor slab to prevent scouring and to prevent overturning of the prefabricated bridge.

In addition, the precast members are further integrated through the connection of the key and the steel wire, and the water stop material and the sealant are compressed on the bonding surface between the precast members, thereby greatly exhibiting the water stop effect.

In addition, the connecting slab mounting bracket not only supports the load coming down from the connecting slab, but also when a tensile stress is generated at the upper slab end and the connecting slab mounting bracket, the connecting slab is primarily used for the tensile force generated at the upper slab end. The bracket responds, and secondarily, the load on the connecting slab and the stress acting on the connecting slab correspond to each other, thereby reducing the fatigue of the connecting slab mounting bracket. As such, the bracket for mounting the connecting slab can respond to the stress acting on the connecting slab by relying on the tensile force at the end of the upper slab, so the mounting bracket and the connecting slab have the advantage of mutually supporting each other.

The following drawings attached to this specification illustrate preferred embodiments of the present invention, and serve to further understand the technical idea of the present invention together with the detailed description of the present invention, so the present invention is limited to the matters described in the accompanying drawings It should not be construed as being limited.
1 is a cross-sectional view and an enlarged view of a one-span prefabricated bridge according to an embodiment of the present invention.
Figure 2 is a cross-sectional view of a two-span prefabricated bridge according to another embodiment of the present invention.
Figure 3 is a cross-sectional view of a four-span prefabricated bridge according to another embodiment of the present invention.
4 is a state diagram in which the upper slab steel wire is installed on the upper slab of FIG. 1;
Fig. 5 is an enlarged view showing a part of Fig. 1;
6 is a view showing the coupling state between the upper slab and the central wall applied to the 2-span or 3-span shown in FIGS. 2 and 3;
7 is a view showing the coupling state between the lower part of the center wall and the lower floor slab applied to the 2-span or 3-span shown in FIGS. 2 and 3;
FIG. 8 is a view showing a coupling state between the upper slabs shown in FIG. 1;
9 is a construction flowchart for exhibiting the index between the upper slabs shown in FIG.
Figure 10 is a side view of Figure 1;
Fig. 11 is a bottom plan view of Fig. 1;

Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the accompanying drawings, but the presented embodiments are illustrative for a clear understanding of the present invention, and the present invention is not limited thereto.

<First embodiment>

First, a one-span prefabricated bridge according to a first embodiment of the present invention will be described.

As shown in FIG. 1 , the one-span prefabricated bridge 10 includes a floor slab 12 disposed on the river bottom, side walls 14 and 14 installed at both ends of the floor slab 12 , and both side walls 14 . , 14) is assembled with the upper slab 16 supported on the upper end.

Here, each of the floor slab 12, the side walls 14 and 14, and the upper slab 16 may be referred to as a 'precast member' in one term. The term 'precast member' means one manufactured in the form of segments using concrete at a factory.

1 and 5, the upper slab 16 has a protrusion section (S) protruding a certain amount from the outer walls of the side walls 14 and 14 at both ends, respectively, and the connection slab between the bracket 141 for mounting the connection slab. A protrusion 161 for relieving bending moment is provided so that an opening groove 161a for negative moment introduction is formed to accommodate the thickness t of (20).
In addition, on the upper portions of both side walls 14 and 14, brackets 141 for mounting the connection slabs protruding a certain amount from the outer wall are formed for mounting the connection slabs 20, respectively.

In order to relieve the bending moment (+M) acting on the upper slab 16, one end of the tension member 17 for relieving bending moment is connected to the embedded coupler 15 embedded in the bracket 141 for mounting the connection slab. After (T) is given, the other end is fixed to the protrusion 161 for bending moment relief. The tension member 17 for relieving bending moment is spaced apart from the connecting steel 30 at a certain distance (d) in the protruding section (S), and is installed vertically through the opening groove (161a) for introducing negative moment, the tensile force (T) is installed to generate a negative moment (-M) in the upper slab 16 by

Here, the tension member 17 for relieving bending moment may be made of any one of a steel wire, a steel bar, and a reinforcing bar. The embedded coupler 15 is a means for connecting and fixing one end of the tension member 17 for bending moment relief to the bracket 141 for mounting the connection slab, and is not limited to a specific shape or structure.

For the connection between all the precast members, any one of a steel wire, a steel bar, and a reinforcing bar may be used, and in this case, it is preferable to tension the connecting steel material 30 to achieve integration. For example, as shown in FIGS. 1 and 5 , the connecting steel material 30 is fixed to the upper slab 16 side by fixing one end thereof to the floor slab 12 side and then pulling the other end through the side walls 14 and 14 . can do it Accordingly, the bottom slab 12, the side walls 14 and 14, and the upper slab 16 are integrated through the tensioned connecting steel 30.

Here, in order to reduce the cross section of the upper slab 16 as shown in FIG. 4 , the upper slab steel wire 32 is embedded in the upper slab 16 in the longitudinal direction to introduce a tensile stress. As described above, the upper slab steel wire 32 into which the tensile force is introduced into the upper slab 16 is embedded to reinforce the cross-sectional strength, so that the cross section of the upper slab 16 can be made slim, thereby connecting the new bridge and the existing road. There is an advantage in that the inclination of the

On the other hand, the assembly between all the precast members is made by the combination of the protrusion key (K) and the keyway (G) as shown in FIGS. 1 and 5 to 7, and the protrusion key (K) and the keyway (G) as shown in FIG. The non-shrinkable mortar (M) is injected between the spaces and integrated.

In addition, the precast member and the precast Between the members For example, as shown in FIG. 9 , the water stop material 50 is attached between the upper slabs 16 and 16 in two rows, the sealant 52 is pre-filled therebetween, and the connecting steel material 30 (steel wire) is tensioned to provide water resistance. It is preferable that the ash 50 and the sealant 52 are compressed to fill the gap between the members. In this way, the precast member and the precast The water-repellent material 50 and the sealant 52 are pressed between the members to fill the voids between the members, thereby exhibiting an excellent water-repellent effect on the bonding surface.

On the other hand, in order to prevent scouring of the bridge, as shown in FIGS. 10 and 11 , the anti-scour beam 60 is positioned on the downstream part of the floor slab 12 and coupled to the floor slab 12 by tension of the steel wire 61 of the floor slab. After the scour prevention beam 60 is filled with rubble 62 on the back side, concrete 63 is poured into the space between the scour prevention beam 60 and the floor slab 12 so that there is no void. .

<Second embodiment>

On the other hand, the present invention can relieve the bending moment (+M) of the upper slabs 16 and 16 by the same structure for the two-span prefabricated bridge 10a.

That is, as shown in FIG. 2 , the central wall 13 disposed on the river bottom, the left and right floor slabs 12 and 12 coupled to the lower portion of the central wall 13, and the floor slabs 12 and 12 It is assembled with precast members of the side walls 14 and 14 erected at the ends of the In the prefabricated bridge 10, the upper slab 16 has a protrusion section S protruding a certain amount from the outer wall of the side walls 14 and 14 at both ends, respectively, and is connected between the bracket 141 for mounting the connecting slab. A protrusion 161 for relieving bending moment is provided so that an opening groove 161a for negative moment introduction to accommodate the thickness t of the slab 20 is formed.
In addition, on the upper portions of both side walls 14 and 14, a bracket 141 for mounting the connection slab that protrudes a certain amount from the outer wall for mounting the connection slab 20 and tensioning the tension member 17 for reducing bending moment is formed. , to relieve the bending moment (+M) acting on the upper slab 16, by connecting one end of the tension member 17 for bending moment relief to the embedded coupler 15 embedded in the bracket 141 for mounting the connection slab. After the tensile force (T) is applied, the other end is fixed to the protrusion 161 for bending moment relief. At this time, the bending moment relief tension member 17 is spaced apart from the connecting steel material 30 by a certain distance (d) within the protrusion section (S) and vertically penetrates the opening groove (161a) for introducing negative moment, so that the tensile force (T) ) to generate a negative moment (-M) in the upper slab 16.
As described above, the bending moment (+M) acting on the upper slab 16 is relieved according to the generation of the negative moment (-M) of the tension member 17 for reducing the bending moment, so that the safety of the bridge can be improved.

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<Third embodiment>

In addition, the present invention can relieve the bending moment of the upper slabs 16 and 16 by the same structure for the three-span prefabricated bridge 10b.

That is, as shown in FIG. 3, the two central walls 13 and 13 are spaced apart from each other and disposed on the river bottom side, and the left and right floor slabs 12 and 12 coupled to the lower portions of the central walls 13 and 13, and The central floor slab 12a, the side walls 14 and 14 erected at the ends of the left and right floor slabs 12 and 12, both side walls 14 and 14 and the central walls 13 and 13 In the prefabricated bridge 10 assembled with precast members of the upper slabs 16 and 16 supported on the top and the central upper slab 16a, the upper slab 16 has side walls 14, 14) has a protruding section (S) protruding a certain amount from the outer wall of the negative moment introduction opening groove (161a) for accommodating the thickness (t) of the connection slab 20 between the bracket 141 for mounting the connection slab A protrusion 161 for reducing bending moment to be formed is provided.
In addition, on the upper portions of both side walls 14 and 14, a bracket 141 for mounting the connection slab that protrudes a certain amount from the outer wall for mounting the connection slab 20 and tensioning the tension member 17 for reducing bending moment is formed. , to relieve the bending moment (+M) acting on the upper slab 16, by connecting one end of the tension member 17 for bending moment relief to the embedded coupler 15 embedded in the bracket 141 for mounting the connection slab. After the tensile force (T) is applied, the other end is fixed to the protrusion 161 for bending moment relief. At this time, the bending moment relief tension member 17 is spaced apart from the connecting steel material 30 by a certain distance (d) within the protrusion section (S) and vertically penetrates the opening groove (161a) for introducing negative moment, so that the tensile force (T) ) to generate a negative moment (-M) in the upper slab 16.
As described above, the bending moment (+M) acting on the upper slab 16 is relieved according to the generation of the negative moment (-M) of the tension member 17 for reducing the bending moment, so that the safety of the bridge can be improved.
As described above, according to the present invention, the end of the upper slab 16 is connected to the side of the connecting steel material 30 that exerts a tensile force, and the upper slab 16 is additionally acted on the upper slab 16 by the tensile force (T) of the tensile member 17 for relieving bending moment. A negative moment (-M) in the opposite direction is generated to the bending moment (+M) to relieve the bending moment, thereby increasing the safety of the prefabricated bridge (10).

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In addition, a scour prevention beam 60 is installed in the downstream part of the floor slab 16 to prevent scouring and to prevent overturning of the prefabricated bridge 10 .

In addition, the precast members are further integrated through the key coupling and the tensioned connection steel material, and the water stop material 50 and the sealant 52 are compressed on the joint surface between the precast members, so that the water stop effect can be greatly exhibited.

In addition, the connecting slab mounting bracket 141 not only supports the load coming down from the connecting slab 20, but also when tensile stress is generated at the end of the upper slab 16 and the connecting slab mounting bracket 141, the upper slab ( 16) The connecting slab mounting bracket 141 primarily responds to the tensile force generated at the end, and secondly, the connecting slab 20 load and the stress acting on the connecting slab 20 correspond to the connecting slab mounting bracket. (141) can reduce fatigue. In this way, the bracket 141 for mounting the connection slab 141 can respond to the stress acting on the connection slab 20 by relying on the tensile force at the end of the upper slab 16, so that the bracket 141 for mounting and the connection slab 20 are in harmony with each other. There is an advantage.

So far, the present invention has been described in detail with reference to the presented embodiment, but those skilled in the art can make various modifications and variations of the invention without departing from the technical spirit of the present invention with reference to the presented embodiment. will be. The present invention is not limited by such variations and modifications, but only by the claims appended hereto.

12: floor slab
13: central wall
14: side wall
141: bracket for mounting connection slab
16: upper slab
161: protrusion for bending moment relief
17: Tension member for bending moment relief
20: connection slab
60: scour prevention guard

Claims (10)

The bottom slab 12 disposed on the river bottom side, the side walls 14 and 14 installed at both ends of the bottom slab 12, and the upper slab supported on the upper ends of the both side walls 14 and 14 ( In the prefabricated bridge (10) assembled with the precast members of 16),
The connection between all the precast members is made to be integrated through the connecting steel material 30 of any one of the steel wire, the steel bar, and the reinforcing bar;
The upper slab 16 has protrusion sections S protruding a certain amount from the outer walls of the side walls 14 and 14 at both ends, respectively, and the thickness of the connection slab 20 between the bracket 141 for mounting the connection slab ( t) is provided with a protrusion 161 for reducing the bending moment so that the opening groove (161a) for introducing the negative moment is formed;
On the upper portions of both side walls 14 and 14, brackets 141 for mounting the connection slabs protruding a certain amount from the outer wall for mounting of the connection slab 20 and tensioning of the tension member 17 for alleviating bending moment are formed;
In order to relieve the bending moment (+M) acting on the upper slab 16, one end of the tension member 17 for relieving bending moment is connected to the embedded coupler 15 embedded in the bracket 141 for mounting the connection slab. After applying the tensile force (T), the other end is fixed to the protrusion 161 for bending moment relief;
The tensile member 17 for relieving bending moment is spaced apart from the connecting steel 30 at a certain distance (d) in the protrusion section (S) and vertically penetrated through the opening groove (161a) for introducing negative moment, so that the tensile force (T) ), a prefabricated bridge that relieves the bending moment of the upper slab, characterized in that the negative moment (-M) is generated in the upper slab 16. The central wall 13 disposed on the river bottom side, the left and right bottom slabs 12 and 12 coupled to the lower part of the central wall 13, and the side surfaces installed at the ends of the bottom slabs 12 and 12 In the prefabricated bridge 10a assembled with the precast members of the walls 14 and 14, the side walls 14 and 14 and the upper slabs 16 and 16 supported on the upper ends of the central wall 13. in,
The connection between all the precast members is made to be integrated through the connecting steel material 30 of any one of the steel wire, the steel bar, and the reinforcing bar;
The upper slab 16 has protrusion sections S protruding a certain amount from the outer walls of the side walls 14 and 14 at both ends, respectively, and the thickness of the connection slab 20 between the bracket 141 for mounting the connection slab ( t) is provided with a protrusion 161 for reducing the bending moment so that the opening groove (161a) for introducing the negative moment is formed;
On the upper portions of both side walls 14 and 14, brackets 141 for mounting the connection slabs protruding a certain amount from the outer wall for mounting of the connection slab 20 and tensioning of the tension member 17 for alleviating bending moment are formed;
In order to relieve the bending moment (+M) acting on the upper slab 16, one end of the tension member 17 for relieving bending moment is connected to the embedded coupler 15 embedded in the bracket 141 for mounting the connection slab. After applying the tensile force (T), the other end is fixed to the protrusion 161 for bending moment relief;
The tensile member 17 for relieving bending moment is spaced apart from the connecting steel 30 at a certain distance (d) in the protrusion section (S) and vertically penetrated through the opening groove (161a) for introducing negative moment, so that the tensile force (T) ), a prefabricated bridge that relieves the bending moment of the upper slab, characterized in that the negative moment (-M) is generated in the upper slab 16. Two central walls 13 and 13 spaced apart from each other and disposed on the river bottom side, left and right floor slabs 12 and 12 and central floor slabs 12a coupled to the lower part of the central walls 13 and 13 and the side walls 14 and 14 installed at the ends of the left and right floor slabs 12 and 12, and the upper part supported on the upper ends of the both side walls 14 and 14 and the central wall 13 and 13 In the prefabricated bridge (10b) assembled with precast members of the slabs (16, 16) and the central upper slab (16a),
The connection between all the precast members is made to be integrated through the connecting steel material 30 of any one of the steel wire, the steel bar, and the reinforcing bar;
The upper slab 16 has protrusion sections S protruding a certain amount from the outer walls of the side walls 14 and 14 at both ends, respectively, and the thickness of the connection slab 20 between the bracket 141 for mounting the connection slab ( t) is provided with a protrusion 161 for reducing the bending moment so that the opening groove (161a) for introducing the negative moment is formed;
On the upper portions of both side walls 14 and 14, brackets 141 for mounting the connection slabs protruding a certain amount from the outer wall for mounting of the connection slab 20 and tensioning of the tension member 17 for alleviating bending moment are formed;
In order to relieve the bending moment (+M) acting on the upper slab 16, one end of the tension member 17 for relieving bending moment is connected to the embedded coupler 15 embedded in the bracket 141 for mounting the connection slab. After applying the tensile force (T), the other end is fixed to the protrusion 161 for bending moment relief;
The tensile member 17 for relieving bending moment is spaced apart from the connecting steel 30 at a certain distance (d) in the protrusion section (S) and vertically penetrated through the opening groove (161a) for introducing negative moment, so that the tensile force (T) ), a prefabricated bridge that relieves the bending moment of the upper slab, characterized in that the negative moment (-M) is generated in the upper slab 16. 4. The method according to any one of claims 1 to 3,
A prefabricated bridge in which the bending moment of the upper slab is relieved, characterized in that the tension member 17 for bending moment relief is made of any one of steel wire, steel bar, and reinforcing bar. delete 4. The method according to any one of claims 1 to 3,
In order to reduce the cross section of the upper slab 16, the upper slab steel wire 32 is embedded in the upper slab 16 in the longitudinal direction to introduce tensile stress. 4. The method according to any one of claims 1 to 3,
Assembling between all precast members is made by combining the protruding key (K) and the keyway (G), and the non-shrinkable mortar (M) is injected between the space of the protruding key (K) and the keyway (G) to ensure that they are integrated. A prefabricated bridge that relieves the bending moment of the upper slab. 4. The method according to any one of claims 1 to 3,
Precast parts and precasts The water stop material 50 is attached between the members in two rows, the sealant 52 is pre-filled therebetween, and the steel wire 30 is tensioned so that the water stop material 50 and the sealant 52 are compressed to fill the gap between the members. A prefabricated bridge that relieves the bending moment of the upper slab. 4. The method of claim 2 or 3,
The central wall 13 relieves the bending moment of the upper slab, characterized in that the lower part is integrated with the floor slab 12 through the coupling of the key K and the tension of the connecting steel material 30 to independently support the load. prefabricated bridge. 4. The method according to any one of claims 1 to 3,
After placing the anti-scour beam 60 in the downstream part of the floor slab 12 and bonding it to the floor slab 12 by tension of the floor slab steel wire 61, rubble 62 on the back side of the anti-scour beam 60 ), and then pouring concrete (63) into the space between the scour prevention beam (60) and the floor slab (12) so that there is no air gap.

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