JPH0336563Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) The present invention relates to the improvement of expansion joints for bridge structures in rivers, valleys, elevated roads, etc., especially load-supporting rubber expansion joints. .

(Prior art) A load-supporting expansion joint is typified by a finger joint, but the problems with this joint are as follows.
Although the fingers intersect with each other, they are structurally completely separated, making it easy for shocks to occur when bridge loads cross the joints. Also, because they are separated, there is a problem in terms of water stopping.

Therefore, recently, several proposals have been made to eliminate the drawbacks caused by the separation of fingers.
In particular, a load supporting type expansion joint in which a steel plate is embedded in a rubber member as shown in FIG. 3 has been proposed. (Journal name: "Bridges and Structures" Article title: "Expansion Device") (Problems that the invention attempts to solve) However, although this proposal solves the above-mentioned problems, it deforms into a bow shape when compressed. This invention solves this problem and focuses on the unidirectionality of vehicles traveling on expressways.
By adopting a staged wheel loading method, the aim is to ensure good running performance and good workability.

[Structure of the idea]

(Means for Solving the Problems) The present invention aims to improve the configuration of an expansion joint by providing a planar shape along the end face of the floor slab in an expansion joint that is installed across the gap at the ends of the floor slab facing each other with a gap in between. A steel plate consisting of a rising part (hereinafter referred to as the rising part) and a curved part that is connected upward and has an approximately quarter cylindrical shape and whose upper end is located almost flush with the surface layer is placed across the gap. Then, an anchor is attached to the backing direction of the rising part of the pair of frames with a bowl-shaped cross section (hereinafter referred to as the "dog-shaped frame") in the direction of road travel, and a rubber member is filled in the curved surface, and the upper part of the vehicle's approach side To provide a load-supporting expansion joint characterized by burying or pasting a steel plate at the middle of a part that straddles a gap and at a position where the load is transmitted, and thereby providing an excellent load-supporting expansion joint. It is something.

(Function) According to the present invention, the wheel load of a moving vehicle is
First, the impact is received by the upper steel plate on the entry side of the vehicle, and then the impact is softened through a rubber member and transmitted to the steel plate that straddles the gap. Furthermore, after the impact is softened through the rubber member, it is transmitted to the floor slab through the bowl-shaped frame body located on the advancing side of the vehicle. Air bubbles generated in the backing material during construction escape upward through the curved surface of the bowl frame.

(Example) Next, an example of the present invention will be described based on the drawings.

In FIGS. 1 and 2, 1 and 2 are steel plates forming a pair of bowl-shaped frame bodies, 3 is a rubber body,
4 and 5 are steel plates, and 6 is an anchor.

Each of the steel plates 1 and 2 has, in its lower section, a rising portion 1a, 2a that runs along the end surface of the floor slabs B, B facing each other with a free space A in between, and an approximately quarter cylindrical shape that is connected upwardly to the rising portion 1a, 2a, and has an upper end. The curved surface portions 1b and 2b are located substantially flush with the surface layer C, and face each other to form a bowl-shaped frame body 9. In addition,
The surface layers C and C may be a pavement layer or a post-cast concrete layer.

The rubber body 3 is made of an elastic elastomer and is filled within the curved surface formed by the curved surface portions 1b and 2b of the bowl-shaped frame body 9.

The steel plate 4 is located on the entry side of the vehicle and is embedded or vulcanized and bonded above the rubber member 3 so as to be flush with the rubber member 3, and also serves to protect the rubber member 3.

A steel plate 5 is buried in the middle of the rubber member 3 as a load support plate in a load support type expansion joint. In this embodiment, the steel plate 5 is formed in an upwardly convex arch shape, so it does not bend easily under wheel loads, and has the advantage that it can be thinner than a flat steel plate. Of course, it may be used.

In this embodiment, the anchor 6 is attached to attachment portions 7 which are stud-welded to each of the rising portions 1a and 1b of the bowl-shaped frame body 9 using attachment collars 8. 10 is a telescopic groove.

Note that the steel plate 4 on the approach side of the vehicle and the steel plate 5 that straddles the gap are either overlapped in cross section as shown in Figure 1, or their spacing and height are adjusted to suit the needs of sequentially transmitting the wheel load of the vehicle. It is necessary that the positional relationship be such that the ratio is greater in height.

In this way, a load-supporting expansion joint is formed as a whole, and the expansion joint is installed at the opposite ends of the floor slab B, B with the gap A in between. Installation will be done by attaching expansion joints in advance and pouring concrete afterwards.

[Effect of idea]

Since the present invention is constructed as described above, it has the following effects.

First, a steel plate located above the entrance side of the vehicle and in the middle across the gap is embedded or attached to the rubber member in a positional relationship that allows the load to be transmitted sequentially. The impact is received by the upper steel plate on the vehicle entry side of the joint, and then is transmitted through the rubber member to the steel plate that straddles the clearance. Further, after the impact is softened through the rubber member, it is transmitted to the floor slab through the steel plate 2 of the bowl-shaped frame 9 located at the end of the floor slab on the advancing side of the vehicle. Therefore, good running performance of the vehicle can be ensured.

In addition, since the overall shape is bowl-shaped, it is easy to attach expansion joints first and place concrete after pouring, and air bubbles that occur after pouring concrete are discharged upward along the curved surface of the steel plate, so they can be poured into the concrete. This eliminates air pockets and enables precise concrete placement.

Furthermore, commonly used shear deformation expansion joints deform into a bow shape when compressed, but in this expansion joint, the anchor can be attached right next to the gap, so it is less likely to deform when compressed.

In this manner, the present invention can provide an overall excellent load-bearing type expansion joint, particularly a load-transmitting type expansion joint.

[Brief explanation of drawings]

Figure 1 is A-A in Figure 2 showing an embodiment of the present invention.
2 is a plan view, and FIG. 3 is a sectional view showing a conventional example. In the figure, 1 and 2 are steel plates forming a pair of bowl-shaped frame bodies 9, 1a and 2a are rising parts, 1b,
2b is a curved surface portion, 3 is a rubber body, 4 and 5 are steel plates, and 6 is an anchor.

Claims (1)

[Scope of utility model registration request] In an expansion joint that is installed across the gap at the ends of the floor slab facing each other across the gap, it has a planar rising part along the edge of the floor plate and an approximately quarter cylindrical part connected upward to the planar rising part. A steel plate consisting of a curved part whose upper end is located almost flush with the surface layer is made into a pair with a gap in between, and an anchor is attached in the backing direction of the rising part of the frame body with a bowl-shaped cross section in the road running direction. Attachment is characterized by filling the curved surface with a rubber material, and burying or pasting steel plates at the positions where the load is transmitted, at the upper part of the rubber material on the entry side of the vehicle and in the middle of the gap. Load-bearing expansion joint.