JP2001123406A - Expanding/shrinking device for road bridge and its construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the projections of corrugated sheets from falling forward in an expanding/shrinking device provided with a pair of corrugated sheets face to face. SOLUTION: Horizontal anchors 10 protruded on the back sections of the corrugated sheets 1 are connected to the vertical reinforcing connecting bars 11 of floor sheets 7, and the base end sections of the horizontal anchors 10 and the lower sections of the reinforcing connecting bars 11 are connected by diagonal reinforcements 15 to form a truss reinforcing structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a telescopic device for a road bridge and a method for constructing the device.

[0002]

2. Description of the Related Art FIG. 4 (plan view of a road bridge joint) shows a pair of corrugated sheets 1 and 1 spaced apart in the bridge length direction so as to form a wavy play space extending in the longitudinal direction of the road bridge joint. And confront,
A road bridge expansion and contraction device in which post-cast concrete 3 is cast on the back of the corrugated sheet is described. In the figure,
Reference numeral 4 denotes a rubber seal plate that connects opposing inner surfaces of both corrugated plates 1 and 1. The construction method of such an expansion device is described in Japanese Patent Publication No. 55-48126. The method will be described with reference to FIG.

That is, both corrugated sheets 1, 1 are opposed to each other so as to form a corrugated play space beside the road bridge joint, and hanging rods 5 are provided on both corrugated sheets 1, 1 so as to cross each other. The suspension rod 5 is connected to the back surfaces of the concave portions of the corrugated plates 1 and 1. At the joints of the road bridges, cutout steps 8, 8 are formed at the ends of the floor slabs (the main body of the road bridge) 7, 7. Connect the suspension rod 5 to the notch
The two corrugated sheets 1 and 1 are suspended in the center between the notch steps 8 and 8 by bridging the pavements 9 and 9 on both sides of the corrugated sheet. Floor slab 7
Connecting bar 11 for connecting steel and post-cast concrete 3
To the anchors 10 and 13 on the back of the corrugated plate. Hanging rod 5
And concrete is cast on the back of both corrugated plates 1 and 1. FIG. 5 shows a state of the corrugated plates 1 and 1 when the suspension rod 5 is removed.

[0004]

However, the corrugated sheet 1
When the hanging rod 5 is removed, the cantilever is supported by only the anchors 10 and 13. For this reason,
As shown in FIG. 5, the corrugated sheet 1 is inclined forward and tilted down by its own weight, and the upper end on the convex side is easily lowered. Such a forward fall becomes particularly remarkable when the amount of protrusion of the convex portion of the corrugated sheet 1 is large (when the unevenness is large). In that case, the opposite corrugated sheet 1,
A height difference occurs between the upper ends of the 1s. Although the upper end surface of the convex portion of the corrugated plate 1 may be intentionally lower than the upper end surface of the concave portion,
Even in such a case, the amount of reduction is larger than expected. Such a forward fall causes the road surface at the joint portion of the road bridge to be formed with unnecessary unevenness, which deteriorates the vehicle traveling performance. The present invention addresses this forward fall.

[0005]

SUMMARY OF THE INVENTION The invention of this application is based on the invention that a pair of corrugated sheets face each other at intervals in the bridge length direction so as to form a clearance of a waveform extending in the longitudinal direction of the seam of the road bridge. The post-cast concrete is carried over on the road bridge main body or abutment behind the board, and the post-cast concrete and the road bridge main body or the abutment are connected to each other by reinforcing connecting bars extending vertically. In the telescopic device, each of the projections projecting to the other side of the two corrugated plates is provided with a horizontal anchor projecting horizontally rearward from the upper rear portion thereof, and is provided from the road bridge main body or the abutment of the reinforcing connecting muscle. The horizontal anchor is connected to the upper part of the part protruding upward, and the lower part of the protruding part of the reinforcing connecting bar and the base end of the horizontal anchor are connected by an oblique member. Is

That is, since the base end portion of the horizontal anchor of the corrugated sheet and the reinforcing connecting bar of the road bridge body and the like are connected by the diagonal member, the horizontal anchor, the reinforcing connecting bar and the diagonal member can be said as follows. Form a truss structure. For this reason, when the convex portion of the corrugated sheet is about to fall forward, the oblique material acts as a compression material and prevents the forward fall.

According to the invention of this application, a pair of corrugated sheets as described above are opposed to each other at intervals in the bridge length direction so as to form a wavy play extending in the longitudinal direction of the seam of the road bridge. Of the road bridge body or abutment of which the post-cast concrete is being handed over, and the post-cast concrete and the road bridge body or the abutment are connected by a reinforcing connecting bar extending in the vertical direction. In the construction method, a horizontal anchor projecting horizontally backward from an upper portion of a back surface is provided on a convex portion of each of the two corrugated plates projecting to a mating side, and the corrugated gaps of the corrugated plates are provided. Are formed so as to intersect with each other, and hanging rods are provided on the corrugated boards so as to intersect with each other, and the corrugated boards are fixed to the hanging rods. Suspended by the hanging rod so that To the upper part of the reinforcement connecting bar projecting above the road bridge body or the abutment, and connect the base end of the lateral anchor and the lower portion of the reinforcing connecting bar protrusion with an oblique material. The suspension rod is detached from both corrugated plates, and concrete is cast on the back of the corrugated plates to the height of the road surface.

That is, in a state where both corrugated sheets are suspended by a suspension rod at a joint portion of a road bridge so that respective portions on an upper end surface have a predetermined height, reinforcement of a horizontal anchor of the corrugated sheet, a road bridge body, and the like. Since the connecting bars and the diagonal members are connected to each other so as to form a truss structure, it is possible to prevent the convex portion of the corrugated sheet from falling forward when the hanging rod is removed.

In the above two inventions, the connection between the horizontal anchor of the corrugated sheet and the reinforcing connecting bars such as the road bridge main body is performed by directly connecting the two to each other or through a through bar extending in the longitudinal direction of the joint. And indirectly connecting the two. As for the diagonal members, the diagonal members may be directly coupled to the lateral anchors or the reinforcing connecting bars, or may be indirectly coupled via other members. In short, it is only necessary that the oblique material be a strut for preventing the convex portion of the corrugated sheet from falling forward.

[0010]

As described above, according to the present invention, the base end of the horizontal anchor of the corrugated sheet and the reinforcing connecting bars such as the road bridge body are connected by diagonal members, and these form a truss structure. With this configuration, it is possible to prevent the convex portion of the corrugated sheet from falling forward, which is advantageous in improving the vehicle traveling performance, and is also easy to construct and advantageous in cost.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

<Structure> As shown in FIG. 1, in the extension device for a road bridge according to the present invention, a pair of corrugated plates 1 and 1 form a wavy play space 2 extending in the longitudinal direction of the seam of the road bridge. Facing concrete 3, 3 are placed on the back of the corrugated sheets 1, 1 so as to face each other at intervals in the bridge length direction. As shown in FIGS. 2 and 3, a bottom plate 12 is fixed to the lower surface of the convex portion 1 a protruding to the opposite side of each corrugated plate 1. Step 8 and bottom plate 1
2 and is in a state of being joined to the floor slab 7. The rubber seal plate 4 connecting the corrugated plates 1 and 1 is formed in a U-shaped cross section. A filler such as sand is filled in the U-shaped groove, and a rubber seal material is provided thereon. I have. Reference numeral 16 denotes a floor slab (seam sluice).

On the back of the corrugated sheet 1, two kinds of anchors 10,
13 are provided. The anchor 10 projects horizontally rearward from the upper back surface of the convex portion 1a projecting toward the corrugated plate opposite to each corrugated plate 1, and its distal end is bent vertically downward. The two anchors 10 are provided on each convex portion 1a. The anchor 13 horizontally projects from the lower rear surface of the concave portion 1b which is relatively recessed away from the corrugated plate 1 of each corrugated plate 1.

A notch step 8 of the floor slab 7 has reinforcing connecting bars 11 for connecting the floor slab 7 and the post-cast concrete 3.
Project vertically. Some anchors 10 of corrugated sheet 1,
13 is directly connected to the upper portion of the protruding portion of the reinforcing connecting bar 11 by welding, and the other anchors 10, 13
Is connected to the reinforcing connecting bar 11 through a through bar 14 extending in the seam longitudinal direction. Then, the base end of one of the two anchors 10 arranged on the convex portion 1a of the corrugated plate 1 and the lower end of the portion of the reinforcing connecting stud 11 projecting above the notch step 8 Are connected by an oblique line 15 which is inclined so as to become lower as going backward. This connection is made by welding. Therefore, anchor 10
And the reinforcing connecting bars 11 and the oblique bars 15 are directly or indirectly connected to each other so as to form a triangle when viewed in the lateral direction (longitudinal direction of the seam), and form a truss structure. Can be.

<Construction Method> A construction method of the above road bridge expansion and contraction device will be described below.

A. Cut-out steps 8, 8 are formed at opposite ends of the floor slabs 7, 7 by a box-cutting method or the like.

B. The temporary assembly of the corrugated plates 1 and 1 is performed beside the notch step 8. That is, the corrugated plates 1 and 1 connected by the rubber seal plate 4 are opposed to each other so as to form an appropriate corrugated play space according to the amount of expansion and contraction of the road bridge. A connecting rod 6 extending in the longitudinal direction of the seam is temporarily attached to the upper end of the back surface of the concave portion 1b of each corrugated plate 1 (easily welded so as to come off when hit with a hammer). The suspension rods 5 intersect on the corrugated plates 1 and 1, and the suspension rods 5 and the connecting rods 6 are connected.

C. The temporarily assembled corrugated sheets 1, 1 are lowered to the center between the notched steps 8, 8 of the floor slabs 7, 7 as shown in FIG. 2, and both ends of the hanging rod 5 are supported by the pavements 9, 9. . That is, both corrugated plates 1 and 1 are arranged such that each portion of the upper end surface thereof has a predetermined height.

D. The anchors 10, 13 of the corrugated sheet 1 are connected to the protruding portions of the reinforcing connecting bars 11 of the floor slab. In other words, the reinforcement 14 is placed on each of the upper anchor 10 and the lower anchor 13, and the reinforcement 14 is connected to the reinforcing connection 11.
, And the intersections (contact portions) of the anchors 10 and 13, the reinforcing connecting bars 11 and the through bars 14 are welded to each other. Therefore, some of the anchors 10 and 13 are directly connected to the reinforcing connecting bar 11, and others are indirectly connected to the reinforcing connecting bar 11 through the through bar 14.
The upper anchor 10 is connected to the upper end of a portion of the reinforcing connecting bar 11 protruding above the notch 8, and the lower anchor 13 is connected to the lower portion of the reinforcing connecting bar 11. become.

E. Further, an oblique line 15 is passed between the base end portion of the upper anchor 10 and the lower end portion of the protruding portion of the reinforcing connecting bar 11, and the intersection is welded (formation of a truss structure).

F. Remove the hanging rod 5 and the connecting rod 6 from the corrugated plate 1.

G. Post-cast concrete is cast on both sides of the corrugated sheets 1,1. At this time, a sponge material is packed on the rubber seal plate 4 so that concrete does not enter between the corrugated plates 1 and 1.

H. The sponge material is removed, a filler is put on the rubber seal plate 4, and the rubber seal material is further poured thereon.

<Effects> In a state where both corrugated plates 1 and 1 are suspended by suspending rods 5 so that each portion of the upper end surface of the corrugated plate is at a predetermined height, the anchor 10 of the corrugated plate 1 is connected to the reinforcing plate. Streak 1
1 and the oblique streaks 15 are connected to each other so as to form a truss structure.
a can be prevented from falling forward. That is, when the convex portion 1a of the corrugated sheet 1 is about to fall forward, the oblique streaks 15 work as a compression material (stretching material) to prevent the forward fall. Therefore, a step is not generated between the upper ends of the corrugated plates 1 and 1, which is advantageous in securing good vehicle traveling performance. In addition, the load-bearing strength of the convex portion 1a of the corrugated sheet 1 is increased by the tension of the diagonal streaks 15,
It is possible to withstand a large wheel load, and the durability of the extension device is increased.

In the above-described embodiment, a reinforcing bar is used as the oblique member, but an iron plate may be used.

Further, as the reinforcing connecting bars, U-shaped ones or inverted U-shaped ones may be used.

Although the corrugated sheet 1 of the above embodiment has a trapezoidal wave shape, it may have a triangular wave shape, a curved wave shape (sine curve shape), or another corrugated plate. In addition, in the above embodiment, the telescopic device is constructed at the seam between the floor slab and the floor slab. However, the present invention can of course be applied to a telescopic device constructed at the seam between the floor slab and the abutment. It is.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a road bridge expansion / contraction device according to the present invention.

FIG. 2 is a cross-sectional view showing one stage of construction of the telescopic device.

FIG. 3 is a plan view showing one stage of construction of the telescopic device.

FIG. 4 is a plan view of a road bridge joint.

FIG. 5 is a cross-sectional view showing one stage of conventional construction.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Corrugated board 1a Convex part 1b Concave part 2 Corrugation play 3 After-cast concrete 4 Rubber seal plate 5 Hanging rod 6 Connecting rod 7 Floor slab (road bridge main body) 8 Notch step 9 Pavement 10 Anchor 11 Reinforcement connecting bar 12 Bottom plate 13 Anchor 14 Through muscle 15 Diagonal muscle

Claims (2)

[Claims] 1. A pair of corrugated sheets face each other at intervals in the bridge length direction so as to form a gap of a waveform extending in a longitudinal direction of a seam of a road bridge, and are provided on a road bridge main body or an abutment behind the corrugated sheets. In a telescopic device for a road bridge in which a post-cast concrete is connected and the post-cast concrete and the road bridge body or abutment are connected by reinforcing connecting bars extending in a vertical direction, The protrusion protruding toward the other side of the vehicle is provided with a horizontal anchor horizontally protruding rearward from the upper rear surface thereof, and the lateral anchor is provided above the portion of the reinforcing connecting muscle protruding above the road bridge body or abutment. An expansion / contraction device for a road bridge, wherein an anchor is connected, and a lower portion of a protruding portion of the reinforcing connecting bar and a base end of a lateral anchor are connected by an oblique member. 2. A pair of corrugated sheets facing each other at intervals in the bridge length direction so as to form a gap of a waveform extending in the longitudinal direction of the seam of the road bridge, and on a road bridge main body or an abutment behind the corrugated sheets. A method of constructing a road bridge expansion / contraction device, wherein the post-cast concrete is connected to the road bridge, and the post-cast concrete and the road bridge body or the abutment are connected by reinforcing connecting bars extending in the vertical direction. Each of the projections protruding to the other side of the two corrugated plates is provided with a horizontal anchor projecting horizontally rearward from the upper rear surface thereof, and facing the two corrugated plates so as to form a play space of the waveform. And suspending rods are provided on the corrugated boards so as to intersect with each other, and the corrugated boards are fixed to the suspending rods. The hanging rods are provided at seams of the road bridge so that the corrugated boards have a predetermined height. Suspended by the horizontal anchor, In addition to connecting the upper end of the road bridge body or the portion protruding upward from the abutment, connecting the base end of the lateral anchor and the lower portion of the protruding portion of the reinforcing connecting bar with an oblique material, A method for constructing a telescopic device for a road bridge, comprising removing concrete from a slab and pouring concrete to a height of a road surface on the back of the corrugated plates.