JPS5933726B2 - How to install a shock absorber on a bridge constructed using the extrusion construction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for installing a shock absorber on a bridge constructed by an extrusion construction method.

Conventionally, shock absorbers that absorb and alleviate the subordinate loads that act on bridges, that is, the displacement of bridge girders due to vehicle braking, starting, and earthquake loads, and then disperse and transmit them to substructures such as bridge piers, are cylindrical cylinders fixed to bridge piers. A piston fixed to the bridge girder and having an orifice hole is inserted into the cylinder, and the piston moves due to the movement of the bridge girder (when the oil flows through the orifice hole of the piston, it acts as a buffer due to the flow resistance). The piston-cylinder type to be used and the other end of a rod-shaped body with one end fixed to a bridge girder are inserted into a casing buried and fixed to the bridge pier, and a high-viscosity viscous material is filled between the casing and the rod-shaped body, A plurality of fixed resistance plates are arranged inside the casing, which is fixed to the rod-shaped body and the bridge piers, which perform a buffering effect by the viscous flow resistance of the viscous body that is generated when the rod-shaped body moves inside the casing due to the movement of the bridge girder, and the fixed resistance Movable resistance plates supported by movable members fixed to the bridge girder are arranged alternately between the plates, and a highly viscous material is filled between the resistance plates, and as the bridge girder moves, the movable resistance plates become fixed resistance plates. Although there are shear resistance type shock absorbers that perform a buffering effect using viscous shear resistance that moves between plates (in some cases, shearing a viscous body), the present invention specifically uses a rod-shaped shock absorber, more specifically, a rod-shaped shock absorber with one end fixed to a bridge girder. The other end of the body is fitted into a casing with a gap fixed to the pier, and the gap is filled with a viscous material, and there is a rod-shaped body inside the casing that moves as the bridge girder moves, The present invention relates to a method of installing a shock absorber, which acts as a buffer against the flow viscous resistance generated when a viscous body flows due to the movement, on a bridge constructed by an extrusion construction method.

As shown in Figure 1, this type of shock absorber A consists of a support C that supports the bridge girder G, that is, a movable support that releases displacements such as expansion and contraction due to temperature changes and tilting, and a fixed support that restrains expansion and contraction and releases only displacements such as tilting. In addition, a casing in which one end of a rod-shaped body is fitted and inserted is buried and fixed in the pier B, and the other end of the rod-shaped body is buried and fixed in the bridge girder G.

When the bridge is constructed using an erection method other than the extrusion method, the installation of the shock absorber A is carried out by unboxing the casing, in which the rod-shaped body is inserted into the pier B, at the same time as or during the manufacture of the pier. A method is adopted in which the bar is placed in a hole and buried and fixed, and the other end of the rod-shaped body is buried and fixed in the bridge girder G on the bridge pier B when the bridge girder G is manufactured using shoring and formwork.

However, in recent years, as shown in Figure 2, an extrusion construction method has been developed in which bridge girders G manufactured in units of several meters to several tens of meters behind the abutment are successively extruded onto piers B manufactured in front. This is an erection method in which the bridge is supported and pushed out by a temporary support device or support C placed on the pier B, and does not use conventional shoring or formwork.

For this reason, when installing a rod-shaped shock absorber in this method, if the shock absorber A is buried in the pier B and the bridge girder G, that is, if the shock absorber A is buried in the pier B in advance, it will become an obstacle when pushing out the bridge girder G, and it will cause defects in the bridge girder G. There are problems in that it is difficult to bury, fix, and extrude.

In order to solve these problems, when pushing out the bridge girder G on the bridge pier B, the bridge girder G is placed on the bridge pier B so that the other end of the rod-shaped body of the shock absorber A, which is buried and fixed in advance in the bridge pier B, does not come into contact with the lower surface of the bridge girder G. Attempts have been made to provide a member for raising the temporary support device to be supported, and to provide an engagement hole in the bridge girder G into which the other end of the shock absorber A is inserted after being erected.

However, when this method reaches the erection position, the bridge removes the members and the temporary support device, lowers the bridge girder G, and places it on the support C that supports the bridge girder G. The other end of the rod-shaped body of the shock absorber must be inserted and fixed into the engagement hole of the receiver, and the work required to remove the members and temporary support device is complicated, resulting in poor workability. There is a problem.

In addition, when the bridge girder G is pushed out, the bridge girder G can be moved without using the temporary support device by using the support C that supports the bridge girder G after erection. Attempts have been made to push out the support C, and in this method, the support C must be installed in the correct position, so the above-mentioned receiver has disadvantages such as the method of raising the support C with a member cannot be adopted.

In view of the above, the present invention provides a method for easily installing a rod-shaped shock absorber without providing a temporary support device for supporting the bridge girder when extruding the bridge girder and a support member for raising the support C in the extrusion construction method. This is what you get.

That is, a casing having an opening at one end, a hollow rod-like body fitted into the casing forming a gap with the casing wall, and a gap formed between the casing and the hollow rod-like body being filled with a viscous material. In the shock absorber, a hollow rod-like body is horizontally divided into upper and lower hollow rod-like bodies at a position protruding from the opening of the casing, and the casing with the lower hollow rod-like body, which has been previously divided into two, inserted into the bridge pier, is fixed. ,
In addition, an upper hollow bar body divided into two parts is fixed to the bridge girder at a predetermined position that matches the lower hollow bar body inserted into the casing fixed to the bridge pier in advance, and when the bridge girder is erected, the hollow bar body is attached to the upper and lower parts. Extrusion characterized by extruding the bridge girder divided into two hollow rod-like bodies to a predetermined position, and fixing the upper hollow rod-like body on the bridge girder side and the lower hollow rod-like body on the pier side together at that position with a locking member. The present invention provides a method for installing a shock absorber on a bridge constructed using the construction method.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

A is a shock absorber, and the shock absorber A is a rectangular hollow rod-shaped body 1
and a casing 2 and a viscous body 3 filled in the casing 2.

The casing 2 has an opening 4 at one end, a sealing material 5 is disposed around the entire periphery of the opening 4, and the opening 4 is connected to the pier B.
It protrudes from the upper surface of the pier B and is fixed to the pier B.

The hollow rod-shaped body 1 has one end fixed to the bridge girder G and the other end fitted into the casing 2. Before construction, the hollow rod-shaped body 1 has a lower part fitted into the casing 2 at a position protruding from the opening 4 of the casing 2. It is horizontally divided into two parts: a hollow rod-like body 6 and an upper hollow rod-like body 6' fixed to the bridge girder G, which are to be integrated at the end of extrusion.

The lower hollow rod-shaped body 6 has an opening 7 at one end, and the other end is larger than the opening 4 of the casing 2 with the opening 7 above the casing wall in the bridge axis direction. It is fitted so as to form gaps 8, 8 and a small gap 9°9 with the casing wall in the direction perpendicular to the bridge axis, and the entire periphery of the end of the opening 7 covers the opening 4 of the casing. , and a lid 10 that comes into contact with the sealing material 5 provided around the entire periphery of the 4 ends of the opening.

In addition, the upper hollow rod-shaped body 6' has openings 11°11' at both ends.
A reinforcing rib 12 is formed on the outer peripheral surface, and one opening 11 is connected to the opening 7 of the lower hollow rod-shaped body.
It protrudes from the lower surface of the bridge girder G and is fixed to the bridge girder G so as to match.

13 is a locking member, and the locking member 13 is arranged around the entire periphery of the opening 7, 110 of the upper and lower hollow rod-shaped bodies 6, 6', and the upper and lower hollow rod-shaped bodies 6, 6' are made hollow by welding. Rod-shaped body 1
It serves as an engagement reinforcing material when integrated into the

14 is mortar filled in the integrated hollow rod-shaped body 1.

The method of installing a shock absorber on a bridge constructed by the extrusion construction method of the present invention is to bury and fix the casing 2 into which the lower hollow rod-shaped body 6, which has been divided into two in advance, is inserted, into the pier B, and to install the shock absorber onto the bridge girder G. After that, the upper hollow rod body 6' is fixed at a predetermined position that matches the lower hollow rod body 6 fitted into the casing 2 which has been fixed to the pier B in advance,
After that, the bridge girder G is pushed out to a predetermined position on the temporary support device or support C that supported the bridge girder G.

Then, when the predetermined position is reached, the opening 11 of the upper hollow rod-shaped body 6' and the opening 7 of the lower hollow rod-shaped body 6 are aligned,
Further, locking members 13 are disposed in the openings 7 and 11, and the upper and lower hollow rod-shaped bodies 6 and 6' are integrated with the hollow rod-shaped body 1 by welding.

Next, the integrated hollow rod-shaped body 1 is filled with mortar 14 to complete the installation.

With this configuration, when a dependent load on the bridge girder G, that is, a short-cycle impact load such as a vehicle restraint/assistance load, a starting load, or an earthquake, acts in the bridge axial direction, the bridge girder G will move in the bridge axial direction with respect to the pier B. The hollow rod-like body 1 moves, and as a result of the movement, the viscous body 3 filled in the casing 2 flows,
That is, the viscous body 3 in one of the gaps 8, 8 in the bridge axis direction formed by the casing 2 and the hollow rod-shaped body 1,
By moving the hollow rod-shaped body 1, the load is absorbed and alleviated by the resistance force (flow viscous resistance force) when flowing through the gaps 9, 9 in the direction perpendicular to the bridge axis to the other gap 8. be.

FIGS. 6 to 9 show other embodiments in which the upper and lower hollow rod-like bodies 6, 6' are integrated into the hollow rod-like body 1.

That is, FIG. 6 shows the locking members 13 arranged around the entire periphery of the openings 7, 110 of the upper and lower hollow rod-shaped bodies 6, 6'.
15 shows a mode of integration.

FIG. 7 shows the openings 7.11 of the upper and lower hollow rods 6, 6'.
A locking member 16 that abuts the entire periphery and has a threaded portion, respectively;
16' is provided and is integrated by screwing with the threaded portion 17 provided on the locking member 13.

FIG. 8 shows upper and lower hollow rod-shaped bodies 6, 6 as the locking member 13.
This figure shows a mode in which wedge-shaped locking members 18, 18' are provided on the entire periphery of the Ω-opening portions 7, 11, respectively, and are fitted together and integrated by welding.

FIG. 9 shows upper and lower hollow rod-shaped bodies 6, 6 as the locking member 13.
'cover the opening 7°11 on the end face of the opening 7,110,
and a flat plate 20 having a protrusion 19 on one side and a protrusion 1 on the other side.
A flat plate 22 having holes 21 corresponding to the holes 21 is disposed, and flange portions 24 and 24' having locking holes 23 and 23' are formed around the entire periphery of the openings 7 and 11.
1 and the locking hole 23 of the flange portions 24, 24'
This shows a mode in which a bolt 25 is placed at 23' to integrate the parts.

The present invention has the above-mentioned configuration, and when installing a rod-shaped shock absorber on a bridge constructed by the extrusion construction method, the hollow rod-shaped body is divided into two parts, an upper and a lower hollow rod-shaped body, and these are placed on the piers and the bridge girder, respectively. By integrating the upper and lower hollow rod-shaped bodies with a locking member after erection and extrusion, the installation of the shock absorbing device can be facilitated. It is able to demonstrate its functions, has excellent workability, and can improve the efficiency of erection work.

[Brief explanation of the drawing]

Fig. 1 is a front view of the bridge showing the arrangement of the shock absorbers, Fig. 2 is an explanatory diagram of the extrusion construction method, Fig. 3 is a vertical side view showing the shock absorbers of the present invention during extrusion construction, and Fig. 4 5 is a longitudinal sectional side view showing the shock absorber of the present invention after installation, and FIG.
The EE line sectional view in the figure and FIGS. 6 to 9 are longitudinal sectional side views showing shock absorbers of other embodiments. A: Shock absorber, 1: Hollow rod-shaped body, 2: Casing, 3:
Viscous body, 6: Upper hollow rod-shaped body, 6': Lower hollow rod-shaped body, 13: Locking member.

Claims (1)

[Claims] 1. A buffer comprising a casing having an opening at one end, a hollow rod-shaped body fitted into the casing to form a gap with the casing wall, and a gap formed between the casing and the hollow rod-shaped body filled with a viscous material. In the device, the hollow rod-shaped body is horizontally divided into upper and lower hollow rod-shaped bodies at a position protruding from the opening of the casing, and the casing with the lower hollow rod-shaped body divided into two parts inserted in advance is fixed to the pier; In addition, an upper hollow bar body divided into two parts is fixed to the bridge girder at a predetermined position that matches the lower hollow bar body inserted into the casing fixed to the bridge pier in advance, and when the bridge girder is erected, the hollow bar body is attached to the upper and lower parts. The characteristic is to push the bridge girder divided into two hollow rod-like bodies to a predetermined position, and at that position, fix the upper hollow rod-like body on the bridge girder side and the lower hollow rod-like body on the pier side together with a locking member. A method of installing shock absorbers on bridges constructed using the extrusion construction method.