JPH0723015U - Guardrail shock absorber for concrete wall - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the cushioning performance of the buffer support metal fittings when a car collides with the guardrail and prevent permanent deformation of the buffer support metal fittings. [Structure] A single steel plate is bent to form a middle radius vertical semi-cylindrical body 1 having a large radius, and a small vertical cylinder 2 connected to one end of the middle lengthwise semi-cylindrical body 1 via a middle vertical flat plate 2. End longitudinal semi-cylindrical body 3 having a radius is formed, and the interior of the end longitudinal semi-cylindrical body 3 faces the interior of the intermediate longitudinal semi-cylindrical body 1. A vertical flat plate 4 extending in parallel with the intermediate vertical flat plate 2 is continuously provided at the end portion, one of the intermediate vertical flat plate 2 and the vertical flat plate 4 is fixed to the concrete wall 5, and the other is fixed to the guard rail 6.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a guardrail buffer support device that supports a guardrail on a concrete wall installed on the side of an automobile road so that the guardrail can be reciprocated.

[0002]

[Prior art]

 Conventionally, as a device for bufferably supporting a guard rail on a concrete wall, as disclosed in Japanese Utility Model Publication No. 53-22710, a V-shaped member having mounting seats at both ends is provided on the concrete wall and the guard rail. There is known a guard rail cushioning support device having a structure in which the mounting seats at both ends of the doglegged member are fixed to the concrete wall and the guard rail with bolts interposed between them.

[0003]

[Problems to be solved by the device]

 In the case of the conventional guardrail cushioning support device, when an automobile collides with the guardrail, bending stress is concentrated on the intermediate bending portion of the dogleg-shaped member, and when the bending stress of the intermediate bending portion becomes excessive, the dogleg-shaped member is formed. Has a drawback in that it loses elasticity and bends sharply, which increases the departure angle of the car in collision.

[0004]

[Means for Solving the Problems]

 In order to advantageously solve the above-mentioned problems, in the buffer support device for guardrails for concrete walls of the present invention, one steel plate is bent to form an intermediate longitudinal semi-cylindrical body 1 having a large radius and its intermediate longitudinal direction. Forming an end vertical semi-cylindrical body 3 having a small radius, which is connected to one end of the facing semi-cylindrical body 1 via an intermediate vertical flat plate 2, and the inside of the end vertical semi-cylindrical body 3 A vertical flat plate 4 extending in parallel with the intermediate vertical flat plate 2 is connected to the other end of the intermediate vertical semi-cylindrical body 1. One of the four is fixed to the concrete wall 5, and the other is fixed to the guard rail 6.

[0005]

【Example】

 FIGS. 3 to 6 show an example of the cushioning support metal fitting 7 used in the embodiment of the present invention, in which one steel plate is bent to form an intermediate longitudinal semicircular cylinder 1 having a large radius. And an end vertical semi-cylindrical body 3 with a small radius, which is connected to one end of the intermediate vertical semi-cylindrical body 1 via an intermediate vertical flat plate 2, and the end vertical semi-cylindrical body is formed. The inside of 3 is opposed to the inside of the intermediate vertical semi-cylindrical body 1, and the other end of the intermediate vertical semi-cylindrical body 1 is provided with a vertical flat plate 4 extending in parallel with the intermediate vertical flat plate 2. The vertical flat plate 4 extends by passing through a position facing the end longitudinal semi-cylindrical body 3, and further, the intermediate vertical flat plate 2 and the vertical flat plate 4 are provided with a plurality of through holes 8 for inserting bolts. Has been.

FIGS. 7 to 10 show another example of the shock-absorbing support metal fitting 7 used in the embodiment of the present invention, in which the length of the vertical flat plate 4 is the width of the vertical half-cylindrical body 3 at the end. Although the length is short so that it does not reach the position facing the free end in the direction, the other configurations are the same as those of the cushioning support metal fittings shown in FIGS. 3 to 6.

1 and 2 show a guard rail cushion support device for a concrete wall according to an embodiment of the present invention, which uses the cushion support fitting 7 shown in FIGS. 3 to 6, and a side portion of a roadbed 9 The intermediate vertical flat plate 2 of the buffer support metal fitting 7 is abutted and fixed to the side wall of the concrete wall 5 provided on the base plate side by the anchor bolt 10, and the guard rail 6 is abutted on the vertical flat plate 4 of the buffer support metal fitting 7. It is fixed by the bolt 11.

When the car collides with the guardrail 6, the collision force causes the intermediate vertical semi-cylindrical body 1 in the buffer support metal fitting 7 to be bent within the elastic limit, and the bending resistance thereof buffers the collision force of the automobile. It Further, when the intermediate vertical semi-cylindrical body 1 is greatly curved and deformed, the vertical flat plate 4 or the bolt 11 abuts against the end vertical semi-cylindrical body 3, so that the end vertical semi-cylindrical body 3 buffers it. The curving deformation of the intermediate vertical semi-cylindrical body 1 is suppressed.

In implementing the present invention, the vertical flat plate 4 may be fixed to the concrete wall 5 and the intermediate vertical flat plate 2 may be fixed to the guard rail 6.

[0010]

[Effect of device]

 According to the present invention, one steel plate is bent to form an intermediate vertical semi-cylindrical body 1 having a large radius, and the intermediate vertical semi-cylindrical body 1 is connected to one end of the intermediate vertical semi-cylindrical body 1 via an intermediate vertical flat plate 2. End vertical semi-cylindrical body 3 having a small radius is formed, and the interior of the end vertical semi-cylindrical body 3 faces the interior of the intermediate vertical semi-cylindrical body 1. A vertical flat plate 4 extending in parallel with the intermediate vertical flat plate 2 is connected to the other end of the vertical flat plate 2, one of the intermediate vertical flat plate 2 and the vertical flat plate 4 is fixed to the concrete wall 5, and the other is fixed to the guard rail 6 When the vehicle collides with the guardrail 6, the whole of the intermediate vertical semi-cylindrical body 1 in the buffer support metal fitting 7 is bent within its elastic limit so that the vehicle is fixed by the intermediate vertical semi-cylindrical body 1. Can effectively absorb the collision force of the vehicle and Ri for buffering support bracket 7 is bent sharply, it is possible to reliably prevent separation angle of an automobile collides from becoming larger.

[Brief description of drawings]

FIG. 1 is a plan view showing a buffer guard support device for a concrete wall guard rail according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional front view showing a guardrail buffer support device for a concrete wall according to an embodiment of the present invention.

FIG. 3 is a plan view showing an example of a buffer support fitting.

FIG. 4 is a side view showing an example of a cushioning support fitting.

FIG. 5 is a front view showing an example of a buffer support fitting.

FIG. 6 is a rear view showing an example of a cushioning support fitting.

FIG. 7 is a plan view showing another example of the buffer support fitting.

FIG. 8 is a side view showing another example of the buffer support fitting.

FIG. 9 is a front view showing another example of the cushioning support fitting.

FIG. 10 is a rear view showing another example of the buffer support fitting.

[Explanation of symbols]

 1 Intermediate vertical semi-cylindrical body 2 Intermediate vertical flat plate 3 End vertical vertical semi-cylindrical body 4 Vertical flat plate 5 Concrete wall 6 Guardrail 7 Buffer support metal fitting 8 Bolt insertion through hole 9 Roadbed 10 Anchor bolt 11 Bolt

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masayuki Yamura 1-7-2 Taito, Taito-ku, Tokyo Foundation Foundation Civil Engineering Research Center

Claims (1)

[Scope of utility model registration request] 1. An intermediate longitudinal semi-cylindrical body 1 having a large radius by bending one steel plate and the intermediate longitudinal semi-cylindrical body 1.
And an end vertically oriented semi-cylindrical body 3 having a small radius, which are connected to each other at one end thereof through an intermediate vertical flat plate 2, and the inside of the end vertically oriented semi-cylindrical body 3 is formed as an intermediate vertically oriented semi-cylindrical body 1. A vertical flat plate 4 extending in parallel with the intermediate vertical flat plate 2 is connected to the other end of the intermediate vertical semi-cylindrical body 1, and one of the intermediate vertical flat plate 2 and the vertical flat plate 4 is provided. Is fixed to the concrete wall 5, and the other is fixed to the guard rail 6.