JP2012251411A - Buffer rubber for bridge fall prevention system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a buffer rubber for use in a bridge fall prevention system for a bridge, which can be installed even in a narrow attachment space.SOLUTION: An attachment steel plate 8 for hanging is attached to a buffer rubber 4 in which a bolt 7 is embedded and fixed in a bonded state, and integrated therewith by being tightened with a nut 9. The installation of the buffer rubber 4 on a concrete wall 3 installed on a bridge pier is performed by fixing the attachment steel plate 8 to the concrete wall 3 by means of an anchor bolt 10 and the like. In that case, a position 12 to bend the attachment steel plate 8 is changed so that an installation position can be freely adjusted and so that the buffer rubber 4 can be installed in a predetermined position.

Description

  The present invention relates to a shock absorber mounting structure used for a bridge drop prevention system.

  There is a buffer rubber used in a conventional fallen bridge prevention system that is fixed to a steel bracket or a concrete wall with a bolt or an adhesive (for example, see Non-Patent Document 1).

  The function of the shock absorbing rubber used for the falling bridge prevention system will be described with reference to FIG. In FIG. 1, a buffer rubber 4 is installed on a concrete wall 3 installed on a pier 2. When the main girder 5 is moved due to an earthquake or the like, a structure that prevents the main girder 5 of the bridge from deviating from the pier 2 and falling off due to the cross girder 1 colliding with and resisting the concrete wall 3 is dropped. This is called a prevention system. In the event of this collision, a buffer rubber 4 is installed on the concrete wall 3 in order to mitigate damage caused by the impact of the structure.

In FIG. 2, the detail of the general attachment method of the conventional shock absorbing rubber 4 is shown. In order to attach the buffer rubber 4 to the concrete wall 3, a step hole processing 6 is applied to the buffer rubber 4 so that the bolt 5 does not protrude from the buffer rubber 4. In some cases, an adhesive may be applied to the buffer rubber 4 to directly adhere to the concrete wall 3.

  In the mounting method as described above, when the concrete wall 3 or the steel bracket or the like and the cross beam 1 of the bridge are close to each other, there is no gap necessary for the mounting and the buffer rubber 4 cannot be easily installed. It cannot be replaced when damaged.

  In addition, in the mounting method in which an adhesive is applied to the back surface of the buffer rubber 4 and adhered to the concrete wall 3, the adhesive strength is greatly affected and decreased by the external environment, the adhesion technique of the worker, and the deterioration of the adhesion surface. Since the strength cannot be measured, there is a problem that the buffer rubber 4 is peeled off due to poor adhesion.

    The present invention is intended to solve the problems of such a conventional attachment method, and an object of the present invention is to make it possible to install a buffer rubber even in a narrow space.

  In order to achieve the above-mentioned object, the present invention provides a buffer rubber 4 with a metal fitting embedded in the buffer rubber 4 so that the buffer rubber 4 is inserted into the gap between the concrete wall 3 and the main girder 5 from the upper surface side. Provided.

Eight effects of the invention

  As described above, the shock absorbing rubber 4 of the present invention can be installed by suspending the mounting rubber 8 from the upper part of the concrete wall 3 by connecting the metal fitting 8 to the shock absorbing rubber 4 even in a place where the mounting space is small.

  In addition, since the construction can be easily performed even after the construction of the concrete wall 3 to which the buffer rubber 4 is attached and the bridge superstructure is completed, it is not necessary to install in a specific position in advance as in the past. The shape and mounting position can be determined by checking the error of the finished mold of the structure.

  Since the mounting surface of the buffer rubber is not provided with a hole, the cross section of the surface that receives the impact is not lost, and the performance of the buffer rubber can be exhibited correctly.

  Hereinafter, description will be given based on FIGS. 3 and 4.

  After drilling a hole on the upper surface of the buffer rubber 4 with a drill or the like, the bolt 7 is embedded and fixed with a resin adhesive and integrated with the buffer rubber 4. A mounting steel plate 8 is attached to the shock absorbing rubber 4 in which the bolt 7 is embedded and fixed and fixed.

  The installation position can be freely adjusted by changing the bending position 12 of the mounting steel plate 8 as shown in FIG. 4, and the buffer rubber 4 is installed at the planned position by being fixed to the concrete wall 3 with anchor bolts 10 or the like. can do.

Bridge side view showing the installation form of the shock absorber 4 Sectional view of conventional shock absorber 4 mounting method Plan view of the cushion rubber of the present invention Sectional drawing of the buffer rubber 4 attachment method of this invention

Claims (2)

    A shock-absorbing rubber characterized in that an embedding fitting is provided in the shock-absorbing rubber so that the shock-absorbing rubber can be suspended.   Bolts are embedded on the upper surface of the buffer rubber and integrated with the buffer rubber. Bolts are made with a drill after the buffer rubber is made, and fixed with a resin adhesive. A shock-absorbing rubber characterized in that a mounting steel plate for suspension is tightened and integrated with a shock-absorbing rubber in which bolts are embedded and bonded.

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