JPS6011174B2 - How to install a shock absorber on a bridge constructed using the cantilever construction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of installing a shock absorber on a bridge constructed by a cantilever construction method, and particularly relates to an installation method that allows position adjustment during installation.

The shock absorber is a cylindrical shock absorber that absorbs and alleviates the load acting on the bridge, i.e. the displacement of the bridge girder due to braking, starting and earthquake loads of the train mausoleum, and transmits it to the substructures such as the piers. Oil is put into a cylinder, and a piston fixed to a bridge girder and having an orifice hole is inserted into the cylinder, and when the piston moves due to the movement of the bridge girder, the oil flows through the orifice hole of the piston, which acts as a buffer for the flow resistance. The end of the rod-shaped body with one end fixed to the bridge girder is inserted into the casing which is buried and fixed to the bridge pier, and the space between the casing and the rod-shaped body is filled with a highly viscous material, and the end of the rod-shaped body is fixed to the bridge girder. A plurality of fixed resistance plates are arranged inside the casing, which is fixed to the rod-shaped body and the pier, which performs a buffering effect by the viscous flow resistance of the viscous body that is generated when the rod-shaped body moves inside the casing, and between the fixed resistance plates. Movable resistance plates supported by movable members fixed to the bridge girder are arranged alternately, and a highly viscous material is filled between the resistance plates, and as the bridge girder moves, the movable resistance plates move between the fixed resistance slopes. There is a break resistance type that performs a buffering effect using viscous break resistance that cuts through a viscous body when it moves, but 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 casing is fixed to the pier, and the rod-shaped body is inserted into the casing with a gap, and the gap is filled with a viscous material. This invention relates to a method for installing a shock absorber that acts as a buffer against the flow viscous resistance generated when a viscous body flows, on a bridge constructed using the Katsubaki 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-like body is fitted with iron is buried and fixed in the pier B, and the other end of the rod-like body is buried and fixed in the bridge girder G.
If the bridge is to be constructed using an erection method other than the cantilever construction method, the shock absorber A should be installed at the same time as or during the manufacture of the pier B with a rod-shaped iron casing inserted into the pier B. The rod-shaped body is placed in the hole cut out and buried and fixed, and the other end of the rod-shaped body is installed on the bridge girder G using shoring and formwork on the pier B.
A method of embedding and fixing it in the bridge girder G is being explored during the manufacture of the bridge girder.

However, in recent years, as shown in Figure 2, a cantilever 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 pushed out onto piers B manufactured in front. G is a temporary support device D placed on the pier B and is supported by the support C and pushed out.
This construction method does not use the conventional shoring and formwork. For this reason, the installation of rod-shaped shock absorbers in this construction method means that if the shock absorber A is buried in the pier B and the bridge girder G in advance, it will become an obstacle when pushing out the bridge girder G, and if the shock absorber A is buried in the bridge pier G in advance, There are problems such as fixing and extruding work is difficult in construction.

In order to solve these problems, when the bridge girder G is pushed out on the bridge pier B, the bridge girder Attempts have been made to provide a receiving member for raising a temporary support device D that supports the bridge girder G, and to provide an engagement hole in the bridge girder G into which the end of the shock absorber A is inserted with an iron after being erected.

However, when this method reaches the erection position, the receiving member and the support device D are removed, and the bridge girder G is lowered and laid on the support C that supports the bridge girder G.
The other end of the rod-like body of the shock absorber must be fixed by inserting an iron into the engagement hole of the shock absorber, and the complicated work of removing the receiving member and the temporary support device D causes problems such as poor workability. There is. Moreover, when pushing out the bridge girder G, the bridge girder G
Instead of the temporary support device D that supports the bridge girder G after construction,
By using the support C that supports the temporary support device D from the beginning,
Attempts have been made to push out the bridge girder G without using a
There are disadvantages such as the inability to use a method of raising the surface.

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 D that supports the bridge girder and a receiving member that raises the support C when the bridge girder is pushed out in the cantilever construction method. This is what you get.

That is, a casing having a mouth part at one end fixed to a bridge pier, a hollow rod-shaped body having one end fixed to a bridge girder and having a mouth inserted into the casing with a gap between the ends and the inner wall of the casing, and a screw hole filled in the casing. In the method of installing a shock absorber consisting of a flexible body on a bridge constructed by the Katsubaki construction method, [a] The hollow rod-shaped body is divided into two parts, an upper hollow rod-shaped body and a lower hollow rod-shaped body, at a position protruding from the closed part of the casing.

[Opening] A pre-boxed recess is formed on the pier and a pedestal is fixed in the recess. 1. A holding member equipped with a sliding member is fixed to a casing in which a lower hollow rod-shaped body is inserted with iron.

B. The casing is placed on the pedestal so that its position can be adjusted within the recess by a sliding contact between the sliding member and the pedestal.

The upper hollow rod is fixed in advance to the bridge girder at a position where it will coincide with the lower hollow rod inserted into the casing at the time of completion of extrusion.

W With the hollow rod-shaped body divided into two, an upper and a lower hollow rod-shaped body, Yuzuru pushes out the girder to a predetermined position.

... When extrusion is completed, the upper hollow rod-shaped body fixed to the bridge girder and the lower hollow rod-shaped body inserted in the casing are fixed together with a locking member. At the same time, fill the recess of the pier with mortar and fix the casing to the pier. That's it [i'~
The present invention provides a method for installing a shock absorber on a bridge constructed by the cantilever construction method, which is characterized by comprising a bridge.

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

A is a shock absorber. "The shock absorber A is a rectangular hollow rod body
It is composed of a casing 2 and a sprain body 3 filled in the casing 2. The casing 2 has a closing part 4 at one end.
A sealing material 6 is disposed around the entire circumference of the end of the closing portion 4, and the entrance portion 4 is projected from the upper surface of the pier B and is fixed to the pier.

Reference numeral 6 denotes a sliding member, and the sliding member 6 is supported by a holding member 7 fixed to the outer peripheral bottom wall of the casing 3 and arranged on the bottom wall.

Reference numeral 8 denotes a recess boxed out in advance on the pier B, and 9 is a pedestal placed on the bottom surface of the recess 8 of the pier.

The hollow rod-shaped body 1 has one end fixed to the bridge girder G and the other end inserted into the casing 2, but before the construction, the hollow rod-shaped body 1 is fixed to the bridge girder G.
It is horizontally divided into two parts: a lower hollow rod-like body 10 inserted into the casing 2 at a position protruding from the entrance 4 of the bridge, and an upper hollow rod-like body 10' fixed to the bridge girder G, which are integrated at the end of extrusion. be. The lower hollow rod-shaped body 10 has an opening 11 at one end, and the other end is larger than the entrance part 4 of the casing 2 with the closing part 11 above the casing wall in the bridge axis direction. A small gap 1 is formed with the casing wall in the direction perpendicular to the bridge axis.
3 and 13, and the entire circumference green at the end of the entrance part 11 covers the closing part 4 of the casing,
In addition, a lid 14 is provided that is in contact with a sealing material 5 provided around the entire circumference of the end of the closed portion 4.

Further, the upper hollow rod-shaped body 10' has closed portions 15, 15 at both ends.
', and a reinforcing rib 16 is formed on its outer peripheral surface, and one opening □ part 15 is connected to the closed part 1 of the lower hollow rod-shaped body.
1, protrudes from the lower surface of the bridge girder G and is fixed to the sister-in-law girder G.

Reference numeral 17 denotes a locking member, and the locking member 17 is arranged on the entire circumference of the entrance portions 11, 15 of the upper and lower hollow rod-shaped bodies 10, 10', and welds the upper and lower hollow rod-shaped bodies 10, I0'. This serves as an engagement reinforcing portion when integrated into the hollow rod-shaped body 1.

18 is the recess 8 of the pier and the integrated hollow rod-shaped body 10
, 10' is filled with mortar.

A method for installing a shock absorber on a bridge constructed by the cantilever construction method of the present invention is to place a pedestal 9 on the bottom of a recess 8 that has been previously provided on the pier B by box cutting, etc. The position of the casing 2 can be adjusted within the recess 8 by means of a sliding member 6 supported by a retainer 7 fixed to the outer peripheral bottom wall of the casing 2 into which the lower hollow rod-shaped body 10 divided into two is inserted. The upper hollow rod 10' is attached to the bridge girder G at a predetermined position to match the lower hollow rod 10 inserted into the casing 2 which has been sent to the pier B in advance after construction. is fixed, and then the bridge girder G is pushed out to a predetermined position on a temporary support device D or support C that supported the bridge girder G. Then, when the predetermined position is reached, the opening 15 of the upper hollow rod-shaped body 10' and the entrance part 11 of the lower hollow rod-shaped body 10 are aligned, and the locking member 17 is arranged at the opening parts 11 and 15. The upper and lower hollow rod-like bodies 10, 10' are integrated into the hollow rod-like body 1 by welding.

Here, if the positions of the lower hollow rod-shaped body 10 on the pier B side and the upper hollow rod-shaped body 10' on the bridge girder G side are misaligned, that is, when the bridge girder G is pushed out to a predetermined position, the upper and lower hollow rod-shaped bodies 10 and 10' do not match, the sliding part 6 arranged on the casing 2 on the pedestal 9 of the casing 2
By sliding inside the recess 8 of the bridge girder with the
The lower hollow rod-like body 10 inserted into the casing is adjusted to match the position of the upper hollow rod-like body 10', and after adjustment, the upper and lower hollow rod-like bodies 10, 10' are fixed together with the locking member 17. It is something to do.

Next, the recess 8 of the pier is filled with mortar 18,
The installation is completed by fixing the casing 2 to the casing B and filling the integrated hollow rod 1 with mortar 18. With this configuration, when a dependent load on the bridge girder G, that is, a shortening of the cycle such as wheel braking, starting, and earthquake, or an impact load acts in the bridge axial direction, the bridge girder G is moved 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, one of the gaps 12, 12 in all directions of the bridge axis formed by the casing 2 and the hollow rod-like body 1. Due to the movement of the hollow rod-shaped body 1, the viscous body 3 in the gap 12 flows into the other gap 12 through the gaps 13, 13 in the direction perpendicular to the bridge axis. It absorbs and alleviates the

In this embodiment, the position of the casing 2 is adjusted by disposing a sliding member 6 on a retaining member 7 fixed to the outer peripheral bottom wall of the casing 2, and placing a cradle 9 on the bottom of the recess 8 of the pier. , the pedestal 9' is arranged on the upper end surface of the recess 8 of the pier, and the upper end of the casing 2 is moved as shown in FIG. A flange-like holding member 7' supporting a sliding member 6' is disposed in the part, and the casing 2 is brought into contact with the sliding member 6' on the pedestal 9' so that the position can be adjusted within the recess 8. It is also possible to use a method of increasing the number of battles to obtain the same effect, and the same effect can be obtained.

In addition, in this embodiment, the flange-shaped retaining material 7' disposed on the casing 2 is not disposed on the entire periphery of the casing 2, but rather on the bridge axis, in order to facilitate the filling of the mortar 18 into the recess 8 after construction. It is desirable to arrange them so that they are aligned with each other along the periphery of the bridge either in the direction or in the direction perpendicular to the bridge axis.

7 to 10 show the upper and lower hollow rod-shaped bodies 10, 10'
This figure shows a case in which a position adjustment function is provided in another embodiment of the coupling mode in which the hollow rod-shaped body 1 is integrated with the hollow rod-shaped body 1.
That is, FIG. 7 shows a mode in which the locking members 17 arranged around the entire periphery of the closing parts 11, 15 of the upper and lower hollow rod-shaped bodies 10, 10' are integrated by bolts 19, 19, and FIG.
Locking members 20, 20 that come into contact with the entire peripheries of the openings 11, 15 of the upper and lower hollow rod-shaped bodies 10, 10' and have threaded portions, respectively.
FIG. 9 shows a mode in which the locking member 1 is provided with
As 7, the upper and lower hollow rod-shaped bodies 10, 10' have closed portions 11,
FIG. 10 shows a mode in which wedge-shaped locking members 22, 22' are provided on the entire circumference of the locking members 15, and the upper and lower hollow rod-shaped bodies 10, 1 are used as the locking members 17.
A flat plate 24 covering the closing parts 11, 15 and having a protrusion 23 on one side and a flat plate 26 having a hole 25 corresponding to the protrusion 23 on the other side is disposed on the end face of the entrance part 11, 15 of 0'. Locking holes 27, 2 are provided on the entire periphery of the closing portions 11, 15.
7' are formed, and the protrusion 2
3 is iron-fitted to the hole 25, and bolts 29 are placed in the locking holes 27, 27' of the flanges 28, 28' to integrate the casing 2.
A holding member 7 fixed to the outer peripheral bottom wall of the pier has a sliding member 6, and the casing 2 slides on a pedestal 9 disposed on the bottom surface of the recess 8 of the pier by the sliding member 6. The position of the lower hollow rod-shaped body 10 inserted into the saddle is adjusted. In addition, in the above-mentioned connection mode, the embodiment shown in FIG.
It is possible to adjust the position of the casing 2 within the recess 8 by sliding the sliding portion 6' supported by the flange-like holding member 7' provided at the upper end. Needless to say.

The present invention has the above-mentioned configuration, and when installing a rod-shaped shock absorber on a bridge constructed by the cantilever construction method,
The hollow rod-like body is divided into upper and lower hollow rod-like bodies and placed on the bridge piers and bridge girders respectively, and the casing is movable after extrusion, so the position of the lower hollow rod is adjusted and the upper and lower hollow rod-like bodies are Since the hollow rod-shaped body can be integrated with the locking member, the shock absorber can be easily installed, and after construction, it can exhibit the desired function of containing and alleviating various loads acting on the bridge girder. It has excellent performance 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 cantilever construction method, and Fig. 3 is a vertical side view showing the shock absorbers of the present invention during extrusion construction. FIG. 4 is a longitudinal side view showing the shock absorber of the present invention after installation, FIG. 5 is a cross-sectional view taken along the line E-E in FIG. 4, and FIG. 6 is a longitudinal side view showing the shock absorber of another embodiment. 7 to 10 are longitudinal sectional side views showing a shock absorber according to still another embodiment. A: Shock absorber, 1: Hollow rod-shaped body, 2: Casing, 3:
viscous body, 6: sliding member, 7: holding material, 8: recess, 9:
cradle, 10: lower hollow rod-shaped body, 10' upper hollow rod-shaped body, 17: locking member, 18: mortar. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10

Claims (1)

[Scope of Claims] 1. A casing having an opening at one end fixed to a bridge pier, a hollow rod-shaped body having one end fixed to a bridge girder and the other end fitted into the casing with a gap between the inner wall of the casing and the casing. In a method of installing a shock absorber consisting of a viscous material filled inside a bridge constructed by the cantilever construction method, (a) hollow rods are placed between the upper and lower hollow rods at a position protruding from the opening of the casing; Divide into two. (b) A pre-boxed recess is formed in the pier and a pedestal is fixed in the recess. (c) Fixing a holding member provided with a sliding member to the casing into which the lower hollow rod-shaped body is inserted. (d) The casing is placed on the pedestal so that its position can be adjusted within the recess by sliding contact between the sliding member and the pedestal. (E) An upper hollow rod is fixed in advance to the bridge girder at a position that matches the lower hollow rod inserted into the casing at the time of completion of extrusion. (f) Push out the bridge girder to a predetermined position with the hollow rod-shaped body divided into two parts, an upper and a lower hollow rod-shaped body. (g) When extrusion is completed, the upper hollow rod-shaped body fixed to the bridge girder and the lower hollow rod-shaped body fitted into the casing are fixed together with a locking member. (h) Fill the recesses of the pier with mortar and fix the casing to the pier.
A method for installing a shock absorber on a bridge constructed by a cantilever construction method, characterized by comprising the above (a) to (h).