JP2501689B2 - Expansion joint for bridge - Google Patents

Description

Detailed Description of the Invention

[0001]

The present invention relates to a bridge for expansion joint is bridged between the concrete being applied over each deck facing each other of the bridges connecting each concrete together.

[0002]

Floor plate according BACKGROUND ART bridges, telescopic under load by the running of the vehicle, rotation, displacement of vibration or the like occurs. Each deck is expanded and contracted by a temperature difference or the like of the season. In order to absorb such displacement, expansion joints for connecting the floor slabs are provided.

An example of a conventional expansion joint for bridges is shown in FIGS. 4 and 5. The bridge for expansion joints are installed between the concrete 8 and 8 is applied over the pair of deck 7 and 7 which faces as shown in FIG. Each concrete 8
Are cut into adjacent side edges to expose the upper portions of a large number of reinforcing bars 6 whose base ends are embedded in the floor slab 7, and the reinforcing joints for bridges are supported by the reinforcing bars 6. . The expansion joint has a gutter member 2 having a U-shaped cross section, which is located between the concrete pieces 8. Backup material 2 in the gutter member 2
b, and the seal material 3 is filled on the backup material 2b.

As shown in FIG. 5, the gutter member 2 has fixed plates 9c and 9c attached to the upper portions of the side walls facing each other. Each fixing plate 9c has a vertical portion along the upper portion of each side wall portion of the gutter member 2a, and a portion that horizontally extends from the upper end of the vertical portion in a direction away from the side wall portion of the gutter member 2a. And each part is supported by anchors 9a and 9b. And each anchor 9
a and 9b are attached to the reinforcing bar 6 projecting from the concrete 8. When the anchors 9a and 9b are in a state of being supported by the reinforcing bar 6, the post-cast concrete portion 9 is placed in the cutting portion of the concrete 8 and the anchors 9a and 9b are embedded in the post-cast concrete portion 9. The upper surface of the post-cast concrete portion 9 is at the same level as the upper surface of each fixing plate 9c.

Each post-cast concrete part 9 and gutter member 2
An expansion / contraction device 5 that connects the concrete pieces 8 to each other is provided on the top. The expansion / contraction device 5 has an expansion / contraction plate 5a made of an elastic material such as rubber, and each side edge of the expansion / contraction plate 5a is fixed by a fixing bolt 6a whose base end is embedded in concrete 8. Has been done. For example, four expansion / contraction absorption grooves 5b are provided on the upper surface of the expansion / contraction plate 5a, and a pair of expansion / contraction absorption grooves 5c are provided on the lower surface. The elastic plate 5 between the elastic absorption grooves 5c on the lower surface
A reinforcing plate 5d is provided horizontally in the lower part of a,
Reinforcing plates 5e and 5e are also provided in a horizontal state on each side of the upper part of the elastic plate 5a. The upper surface of the elastic plate 5a is at the same level as the concrete 8.

[0006]

In a bridge, the larger the size of the bridge, the wider the space between the pair of floor slabs 7 and 7 facing each other. Therefore, since the expansion joint is greatly affected by the transportation load of the vehicle or the like, it is necessary to reinforce the floor slab 7 and the concrete 8 above it. For this purpose, anchors 9a and 9b are embedded in the post-cast concrete parts 9 and 9 at the ends of the concretes 8 and 8, respectively.

However, each post-cast concrete part 9
The horizontal portion of the fixed plate 9c is exposed on the upper surface of the fixed plate 9c, and the horizontal portion of the fixed plate 9c and the reinforcing plate 5d disposed below the elastic plate 5a are interposed via the lower surface of the elastic plate 5a. Surface contact. Therefore, when a large number of vehicles pass over the bridge, a large transport load is applied to the expansion plate 5a, and a significant noise may be generated by the horizontal portion of the high hardness fixing plate 9c and the reinforcing plate 5d. .

The post-cast concrete portion 9 is formed by placing concrete below the horizontal portion of the fixed plate 9c, but the horizontal portion of the fixed plate 9c makes it difficult to cast concrete. It takes a lot of work. Moreover, it is not easy for the operator to confirm the concrete pouring condition, and the work efficiency becomes worse. Furthermore, there is a possibility that the concrete will not be surely filled all the way to the corners. In this case, there is a problem that rattling occurs in the fixing plate 9c.

The present invention solves such a problem, and an object thereof is to provide an expansion joint for a bridge which alleviates shocks due to vibrations and repeated loads generated when a vehicle passes and reduces noises. It is in. Another object of the present invention is to provide an expansion joint for bridges that can be easily installed on a construction site.

[0010]

The expansion joint for bridges of the present invention is an expansion joint for bridges arranged between concretes constructed on a pair of floor slabs, and is located between the concretes. And a groove-shaped gutter member having a pair of side wall portions with an open upper surface, a backup material filled in the gutter member, a seal material filled on the backup material in the gutter member, and the gutter member A pair of fixing plates attached to each side wall of the, and a large number of anchors that are respectively supported by the reinforcing bars protruding from the end of each floor slab and embedded in concrete so that each fixing plate is in a vertical state. A pair of bearing members, a rigid elastic plate that is supported by a fixing plate that supports each side wall portion of the gutter member in each of the bearing members and extends horizontally in a direction away from the gutter member, and the hard elastic member. To cover the board It will be provided with expansion device bridging the concrete, the above-described object can be achieved.

[0011]

In the expansion joint for bridges of the present invention, a large number of anchors of a pair of supporting members for supporting the gutter member are embedded in the concrete, and each anchor reinforces the end portion of the concrete. A hard elastic plate is provided on the upper surface of the end of the concrete in which the anchor of the support member is embedded,
The hard elastic plate mitigates the impact of vibration and repeated load when the vehicle passes.

[0012]

EXAMPLES The present invention will be described below with reference to examples. The expansion joint for bridges of the present invention, as shown in FIGS. 1 and 2, has a pair of floor plates 7 supported by bridge girders with appropriate intervals.
It is erected between the ends of 0 and 70. The expansion joint for bridge has a pair of support members 10 and 10 supported by each floor slab 70, and a gutter member 21 installed between the support members 10 and 10.

Each floor slab 70, at each adjacent end,
Reinforcing bar 6 provided inside with a proper space in a vertical state
The upper part of 0 is exposed, and the supporting members 10 and 10 in the expansion joint of the present invention are supported by the exposed reinforcing bars 60 of each floor slab 70. Then, with each bearing member 10 being supported by the reinforcing bar 60,
Concrete 80 is applied on each floor slab 70. As shown in FIG. 2, each supporting member 10 extends along the width direction of the bridge so as to support the upper portions of the opposite side wall portions of the trough member 2 having a U-shaped cross section. It has a plate 11. The support member 10 has a large number of anchors 12 horizontally attached to each concrete 80 side (rear side) at appropriate intervals in the longitudinal direction.
Each anchor 12 is supported by the exposed reinforcing bars 60 of the floor slab 70.

The gutter member 21 supported between the fixing plates 11 of each supporting member 10 is formed of an elastic plate material, for example, a rubber plate, in a U-shaped cross section, and extends along the width direction of the floor slab 70. It is extended. The fixing plate 11 of each of the support members 10 described above
Is bolted to each side wall of the gutter member 21 to support the entire gutter member 21. A backup material 22 is filled in the gutter member 21 except for the upper portion of the gutter member 21.
And a sealing material 30 filled on the backup material 22.
And are arranged. As the backup material 22, for example, urethane foam is used, and the sealing material 3 is used.
As 0, a polybutadiene-isocyanate-based resin is used.

On the fixed plate 11 of each supporting member 10 which supports each side wall of the gutter member 21, side edges of a horizontal hard elastic plate 40 are respectively supported. Each hard elastic plate 40 is located on a side edge portion of the concrete 80 adjacent to each side wall portion of the gutter member 21, and has a hardness of 70 to 70, for example.
It is made of hard rubber of 80 degrees.

Positioning plates 31 are provided on the side walls of the gutter member 21, respectively. Each positioning plate 31 is in a state of abutting against the upper surface of the fixed plate 11 of the support member 10, and the end surface of the hard elastic plate 40 is abutted to position the hard elastic member 40. .

As shown in FIG. 3, a telescopic device 50 is installed between each concrete 80. As shown in FIG. 1, the expansion / contraction device 50 is provided with concrete 80
A supporting member 51 made of a rubber plate provided between the cut ends adjacent to each other, and a plurality of fixing bolts in which the base end is embedded in concrete 80 and the front end projects vertically. Each side edge portion of the support member 51 is fitted into the support member 61 and is fixed by a nut 54. The support material 5
On the upper surface of 1, there are provided four expansion / contraction absorbing grooves 51a extending in the longitudinal direction of the gutter member 21 at appropriate intervals. On the upper part of the support member 51, the upper reinforcing plates 52 and 52 are horizontally arranged along the longitudinal direction of the gutter member 21 so as to be located between the pair of expansion and absorption grooves 51a and 51a located on each side. It is buried under. Further, on the lower surface of the support member 51 in the expansion / contraction device 50, a pair of expansion / contraction absorption grooves 51a located on each side of the upper surface of the support member 51.
And 51a, a pair of expansion / contraction absorption grooves 51b and 51b are provided, respectively. Then, each expansion / contraction absorbing groove 5 in the lower portion of the support member 51.
A lower reinforcing plate 53 is provided in a horizontal state between 1b. The lower reinforcing plate 53 covers the sealing material 30 filled in the gutter member 21 over the entire longitudinal direction thereof, and each side edge portion of the lower reinforcing plate 53 has each hard elastic plate 40.
Has reached above.

The expansion joint for a bridge of the present invention having such a structure is manufactured as follows. The gutter member 21 is in a state in which the fixing plate 11 of the support member 10 is attached to each side wall portion in advance, and the inside thereof is filled with the backup material 22 and the sealing material 30, respectively. Moreover, one side edge portion of the hard elastic plate 40 is attached to the upper surface of each fixing plate 11 so that the hard elastic plate 40 is in a horizontal state. Then, the anchors 12 of the support members 10 are attached to the reinforcing bars 60 whose upper portions project vertically upward from the floor slab 70 so as to be in a horizontal state. As a result, the backup material 22
The gutter member 21 filled with the sealing material 30 is used for each floor slab 7
It will be installed between 0. Further, the base end of the fixing bolt 61 is attached to a predetermined reinforcing bar 60 so that the upper part is in a vertical state.

In this state, concrete 80 is applied on each floor slab 70. In this case, since the hard elastic plate 40 can be removed, the concrete construction work can be easily performed. Moreover, it can be easily confirmed that the concrete flows all the way to the corners. Each concrete 8
0 means that the telescopic device 50 is installed horizontally between the two,
Adjacent ends of each of the expansion and contraction devices 50 are formed in a concave shape so that the upper surface of the expansion and contraction device 50 is at the same level as the upper surface of each concrete 80. As a result, each fixing bolt 61
The upper end of each is exposed in each concavely formed portion.

After that, the expansion / contraction device 50 is placed on the concave portion of each concrete pavement 80, the hard elastic plate 40 and the sealing material 30, and each side edge portion of the support member 51 in the expansion / contraction device 50. Is fitted to the protruding upper part of the fixing bolt 61. Then, a nut 54 is attached to each fixing bolt 61.
The telescopic device 5 is screwed and tightened.
0 is fixed.

In the bridge constructed with such a bridge expansion joint, expansion and contraction occurring in each floor slab 70 due to a seasonal temperature difference is absorbed by the expansion device 50 and the backup member 22 in the gutter member 21. It Further, the bridge receives a load due to the traveling of the vehicle or the like to undergo displacement such as expansion / contraction, rotation, and vibration, and these displacements are also absorbed by the expansion / contraction device 50 and the backup member 22 in the gutter member 21. Therefore, the durability of the bridge is improved. Furthermore, the telescopic device 5
Since the lower reinforcing plate 53 inside 0 is in a state of facing the hard elastic plate 40, noise due to impact when a transportation load by the vehicle is applied is reduced.

[0022]

As described above, in the expansion joint for bridge of the present invention, the anchor of the support member is embedded in the concrete, and the end portion of the concrete is reinforced. In addition, since the hard elastic plate is interposed between the concrete and the expansion / contraction device, the hard elastic plate absorbs vibrations and shocks due to repeated loads when passing through the vehicle. Therefore, generation of noise is reduced and durability is improved. Furthermore, since the hard elastic plate can be removed,
You can easily confirm that the concrete is flowing all the way into the area.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of a bridge expansion joint of the present invention.

FIG. 2 is a sectional view of an essential part of the expansion joint for a bridge.

FIG. 3 is a plan view thereof.

FIG. 4 is a cross-sectional view showing an example of a conventional expansion joint for bridges.

FIG. 5 is a sectional view of the main part.

[Explanation of symbols]

 10 Supporting Member 11 Fixing Plate 12 Anchor 21 Gutter Member 22 Back Up Material 30 Sealing Material 40 Hard Elastic Plate 50 Stretching Device 51 Supporting Material 51a Stretching Absorption Groove 51b Stretching Absorption Groove 52 Upper Reinforcement Plate 53 Lower Reinforcement Plate 60 Reinforcing Bar 61 Fixing Bolt 70 Floor slab 80 concrete

Claims (1)

(57) [Claims] 1. An expansion joint for bridges arranged between concretes constructed on a pair of floor slabs, which is located between the concretes and has an upper surface having a pair of side wall portions. A groove-shaped gutter member, a backup material filled in the gutter member, a seal material filled on the backup material in the gutter member, and a pair of fixing plates attached to respective side wall portions of the gutter member. , And a pair of bearing members each having a plurality of anchors that are respectively supported by the reinforcing bars that are projected from the end of each floor slab and are embedded in the concrete so that each fixing plate is in a vertical state, and in each of the bearing members. A rigid elastic plate that is supported by a fixing plate that supports each side wall of the gutter member and extends horizontally in a direction away from the gutter member, and is installed between the concretes so as to cover the hard elastic plate. Telescopic device An expansion joint for bridges, comprising: