JPS60253605A - Extensible apparatus of bridge beam - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] This invention relates to an expansion and contraction device for a road bridge.

Conventional expansion and contraction devices for bridges are made of mechanically movable structural parts (expansion joints) made of steel or rubber processed materials, which are combined to close the ends of the bridge girder, and whose upper surface is connected to the road surface. This is what it was supposed to be. However, with this conventional telescoping device, since a car runs over the device and tire pressure acts directly on the device, not only the telescoping device itself but also the parts where it is attached to the bridge girder were often damaged. Damage to the main body of the device and attached parts is not only troublesome and difficult to repair completely, but also requires traffic closures and traffic regulations when repairing, resulting in large sacrifices for road users. It had become. Furthermore, even if the device is not damaged, driving a car over this telescoping device and its attached parts generates noise and vibration, which is a great nuisance not only to the driver but also to those around them. Ta.

In consideration of the above-mentioned current situation, the present invention was made in order to realize a durable expansion and contraction device that does not rely on conventional mechanical expansion and contraction devices.

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows an embodiment of the present invention, and is a longitudinal sectional view of a bridge. As shown in the diagram, adjacent bridge girders (
1), (Attach a concave hanging steel plate (4a) to the end of 11 by bolting or welding or other appropriate method, and connect the two bridge girders (11 (1) with this hanging steel plate (4a).This hanging steel plate The concave portion of (4a) is filled with sand or a similar material, and the pavement (7) is laid on top of the filling material (5). In order to prevent leakage to the outside, folded plate-like walls (8a) are provided at both ends of the hanging steel plate (4a) in the longitudinal direction, as shown in Figure 4. It is constructed as if it were suspended.In the figure, (2) shows the support, (3) shows the pier, and (6) shows the running surface.

With the above configuration, when expansion and contraction occurs between the bridge girders (11 (1)), the hanging steel plate (4a) is deformed. However, this deformation also causes a change in the volume (volume) inside the hanging steel plate (4a). By designing the shape to prevent this from occurring, it is possible to keep the upper surface position of the filler (5) almost unchanged.For example, by using a hanging steel plate (4a) with a concave cross section, the span and sag can be adjusted. If the ratio is 2:l, the volume of the hanging steel plate (4a), that is, the filling material (
The volume of 5) remains approximately constant regardless of the shape deformation of the suspended steel plate (4a). In this way, the volume of the filler (5) can be kept almost constant regardless of the shape deformation of the hanging steel plate (4a), and on the other hand, the bridge (
11 (It is possible to absorb the expansion and contraction movement between 11 and 11, and at the same time, even when the hanging steel plate (4a) is deformed, the upper surface position of the filler (5) can be kept almost constant, and the pavement with the filler (5) (7) can be prevented from pushing up or falling down, and it becomes possible to continue stably supporting the pavement (7) by the filler (5) at all times.

Although sand was used as the material for the filler (5) in the above embodiment, powdered materials such as soil, gravel, crushed stone, or asphalt concrete capable of viscoplastic deformation may also be used. ) without restricting the deformation of the pavement (7)
Any material suitable for support may be used. It is also possible to fill with ordinary concrete, but in that case it is necessary to provide joints in the concrete so as not to prevent the hanging steel plate (4) from deforming freely.

Furthermore, Fig. 5.6 shows another embodiment, and as shown in the figure, the shape of the hanging steel plate (4b) may be arcuate in cross section, in which case both ends in the longitudinal direction are folded plate-shaped. It becomes a spherical wall (8b) instead of a wall (8a). Furthermore, FIG. 7 shows another embodiment, and the examples in FIGS. 4 and 6 are suspended steel plates (4
a) Although the example in which each of (4b) is one is shown, it is also possible to provide a plurality of hanging steel plates (4C) in parallel as shown in the figure.

In addition, it goes without saying that the present invention should not be limited only to the above-mentioned embodiments, but can be applied in various ways.

Since the present invention is configured as described above, it exhibits the following excellent effects.

■Elongation and contraction of the bridge girder can be absorbed by the deformation of the hanging steel plates, and the surface position of the filling material does not change vertically even when the hanging steel plates are deformed, and the pavement on the filling material can always be stably supported. A continuous paved road surface can be ensured regardless of the connection part, and unlike conventional expansion and contraction devices, there is no discontinuous part of the road surface, thereby completely solving various problems such as vibration, noise, and damage.

■Even when a bridge girder shifts due to an earthquake or the like, the device of the present invention can prevent the bridge girder from falling.

[Brief explanation of drawings]

1 to 4 show one embodiment of the present invention, FIG. 1 is a longitudinal cross-sectional view of the bridge in the longitudinal direction, FIG. 2 is a schematic view taken along the line ■ in FIG. Schematic view of line arrows, Figure 4 is the ■ of Figure 3
It is a line arrow view. 5 and 6 show other embodiments of the present invention, FIG. 5 is a longitudinal sectional view, FIG. 6 is a schematic diagram showing the planar shape of the rope plate portion of FIG. 5, and FIG. FIG. 7 is a schematic plan view showing still another embodiment of the invention. +11... Bridge girder (4a), (4b), (4c)... Hanging steel plate (5)...
・Filler (7)...Paving patent applicant Yoshi Matsumoto
Attorney Tsukasa Patent Attorney Nishi 1) New Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] It consists of a container-shaped hanging steel plate attached between the ends of a bridge girder, and a filler filled into the hanging steel plate, and when the hanging steel plate is deformed due to the expansion and contraction of the bridge girder, the filling material is removed regardless of the deformation. A bridge girder expansion/contraction device characterized in that it is configured such that the surface position of the bridge girder can always remain substantially constant.