JPH1060820A - Steel stopper with buffer function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steel stopper with buffer function capable of buffering impact force caused by earthquake, etc., and preventing the breakage in the stopper device, bridge girder or bridge pier or abutment. SOLUTION: A steel stopper with buffer function 1 is provided between a bridge girder G and an abutment (lower structure) A for bearing the bridge girder G. The bridge girder G is a PC girder, and is borne on two rubber bearings. The buffer function loaded steel stopper 1 is installed between the rubber bearings (the center in the direction of the width of the bridge girder G). The buffer function loaded steel stopper 1 is constituted of a lower plate 10 fixed to the upper surface of the abutment A, an upper shoe 20 fixed to the lower surface of the abutment A and a buffer rubber 30 (elastic buffer) provided between the lower plate 10 and upper shoe 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is particularly provided between a bridge girder and a lower structure such as a pier or abutment for supporting the bridge girder, and restricts relative movement between the bridge girder and the lower structure to prevent a bridge from falling. It belongs to the steel stopper with the buffer function.

[0002]

2. Description of the Related Art Hitherto, a bridge prevention device has been used to prevent a bridge from being dropped. In particular, it has been desired to install two or more bridge prevention devices in response to the Great Hanshin Earthquake.

[0003] A wide variety of bridge fall prevention devices have been developed and provided. The main ones are the stopper type bridge prevention device and the connection type bridge prevention device.

Various types of stopper-type bridge prevention devices have been provided. One of them is actual fairness 2-4849
No. 4 (a stopper device for restricting structure movement). According to the invention, an upward projection (2) provided on an upper surface of a lower stopper member (1) fixed to an upper surface of a support structure (a lower structure such as a bridge pier, an abutment) and a downward opening recess (4) are provided. It is roughly composed of a structure (bridge girder). The movement is restricted by the engagement between the upward projection (2) and the downward opening recess (4).

[0005]

However, in the above prior art, since the projection (2) is a steel member integrally provided on the upper surface of the stopper member (1), the supporting structure and the structure are damaged by an earthquake or the like. When vibrated, a shocking force is applied to the projections (2), and this impact force has a problem in that the stopper device, and further, the bridge girder, the pier or the abutment are broken.

The positioning piece (5) in the above invention
Is made of rubber, but is for providing the gap G, and does not buffer the impact force.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to buffer an impact force caused by an earthquake or the like and to prevent a stopper device, and further, a bridge girder or a pier or an abutment from being destroyed. It is another object of the present invention to provide a steel stopper having a shock-absorbing function.

[0008]

The gist of the invention according to claim 1 is that a bridge girder is provided between a bridge girder and a lower structure such as a pier or an abutment for supporting the bridge girder, and the bridge girder and the lower structure are connected to each other. A steel stopper with a buffer function for restricting relative movement and preventing a bridge from falling, wherein the lower plate is fixed to an upper surface of the lower structure, and the lower plate is fixed to a lower surface of an end of the bridge girder, and the lower surface in a fixed state. An upper part provided with a concave part that opens into the lower plate, a lower part is fixed to the upper surface of the lower plate, an upper part is inserted into the concave part, and the upper part is slidable at least in the bridge axis direction inside the concave part. An elastic cushioning material interposed between the watermelon and the lower plate, the elastic buffer being shorter than the length of the recess in the bridge axis direction, wherein the lower plate is provided with a stopper extending upward, In the mud, the bridge girder and the lower part When relative movement in the bridge axis direction occurs between the bridge and the structure, a pair of contact pieces with which the stopper comes into contact are provided at intervals in the bridge axis direction, and the gap between the contact pieces and the bridge of the stopper are provided. The difference between the length in the axial direction is longer than the difference between the length in the bridge axis direction of the concave portion and the length in the bridge axis direction of the elastic cushioning material, and the elastic cushioning material is formed before the stopper comes into contact with the contact piece. Is in contact with the end face of the concave portion and is deformed. The gist of claim 2 is that the gist of the invention is provided between a bridge girder and a lower structure such as a bridge pier or an abutment that supports the bridge girder, and restricts relative movement between the bridge girder and the lower structure. A lower plate fixed to the upper surface of the lower structure, and a concave portion fixed to the lower surface of the end of the bridge girder and opened to the lower surface in the fixed state. The provided upper and lower plates are fixed to the upper surface of the lower plate, the upper portion is inserted into the concave portion, and the upper and lower plates are slidable at least in the bridge axis direction inside the concave portion. And an elastic cushioning material that is shorter than the length of the recess in the bridge axis direction. The upper plate is provided with a stopper that extends downward, and the lower plate is provided with the lower plate. Bridge axle between bridge girder and said substructure When a relative movement in the direction occurs, a pair of contact pieces with which the stopper abuts are provided at intervals in the bridge axis direction, and the difference between the interval between the contact pieces and the length of the stopper in the bridge axis direction is provided. Is longer than the difference between the length of the recess in the bridge axis direction and the length of the elastic cushioning material in the bridge axis direction, so that the elastic cushioning material contacts the end face of the recess before the stopper contacts the contact piece. The present invention resides in a steel stopper having a shock-absorbing function, which is characterized by being contacted and deformed. The gist of claim 3 is that the lower plate is provided with a fitting hole into which a lower portion of the elastic buffer material can be fitted, and the elastic buffer material is fitted and fixed in the fitting hole. A steel stopper with a shock-absorbing function according to claim 1 or 2. The gist of the present invention is that a low friction material is provided on at least one of the concave portion and the elastic cushioning material. In the steel stopper. The gist of the present invention is characterized in that the gist of the invention is interposed with a gap between the elastic cushioning member and the concave portion. In the steel stopper. The gist of the present invention resides in a steel stopper having a shock-absorbing function, wherein the fitting hole is at least a hole elongated in a bridge axis direction. The gist of the invention is that the elastic cushioning material is fixed to the lower surface of the upper plate instead of the upper surface of the lower plate, and the concave portion is the lower plate instead of the lower surface of the upper plate. The steel stopper according to claim 1, wherein the stopper is provided on the upper surface of the steel stopper. The gist of the present invention is characterized in that the gist of the present invention is interposed with a gap between the elastic cushioning material and the lower plate, wherein the stopper is made of a steel with a shock absorbing function. Exists.

The low friction material in the present invention refers to a material having a lower friction coefficient than steel, such as Teflon (polytetrafluoroethylene), a stainless steel plate and the like.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings.

As shown in FIGS. 1 and 2, a steel stopper 1 with a buffer function according to the present embodiment is provided between a bridge girder G and an abutment A (lower structure) for supporting the bridge girder G. ing. Bridge girder G is a PC girder and two rubber bearings B
(Not shown in FIG. 2). Between these rubber bearings B (the center in the width direction of the bridge girder G), a steel stopper 1 with a cushioning function is installed.

As shown in FIGS. 3 and 4, a steel stopper 1 with a shock absorbing function includes a lower plate 10 fixed to the upper surface of the abutment A, an upper lug 20 fixed to the lower surface of the end of the bridge girder G, Cushioning rubber 3 interposed between the plate 10 and the upper surface 20
0 (elastic cushioning material).

The lower plate 10 is a steel plate having a rectangular shape in plan view as shown in FIG. As shown in FIGS. 5 to 7, a pair of substantially rectangular parallelepiped stoppers 11 projecting upward are provided at both edges of the upper surface. The stopper 11 is fitted into the lower plate 10 and fixed by welding. At the center, as shown in FIGS. 5 and 6, a rectangular insertion hole 1 for fitting a cushion rubber 30 described later in a plan view.
2 are formed. Female screws are cut near the four corners,
As shown in FIG. 5 to FIG.
Is screwed.

As shown in FIG. 8, the upper side 20 is a steel plate having a substantially I-shape in plan view with notches 21 provided at both edges. The portion corresponding to the horizontal portion of the letter I (the portion protruding in the bridge axis direction in the installed state) is the contact piece 22. The contact piece 22 is thinner than other parts so as to provide a gap between the contact piece 22 and the lower surface of the bridge girder G. A concave portion 23 that opens is provided on the lower surface. Recess 23
It has a long rectangle in the longitudinal direction of 0 (bridge axis direction). The length u of the recess 23 is longer than the length v of the cushion rubber 30. The symbol v is shown in FIG. The difference (s-t) between the interval (length of the notch 21) s of the contact piece 22 and the length t of the stopper 11 is the difference (u) between the length u of the concave portion 23 and the length v of the cushion rubber 30. −v), the stopper 11 is movable in the bridge axis direction. The symbol t is shown in FIG. To show one design example,

The distance s between the contact pieces 22 is 490 mm, the length t of the stopper 11 is 210 mm, the length u of the concave portion 23 is 550 mm, the length v of the buffer rubber 30 is 310 mm, st = 280 mm, and uv = 240 mm. st−u> uv.

A female screw for screwing an upward anchor 24 also shown in FIGS. The upward anchor 24 is fixed by welding after being screwed into the female screw.

As shown in FIGS. 3 and 4, the cushioning rubber 30 has a lower portion fixed to the upper surface of the upper surface 20 in an installed state, and an upper portion inserted into the concave portion 23. The material can be a material suitable for practicing the present invention, such as synthetic rubber or natural rubber. As shown in FIG. 10 to FIG. The length v of the cushion rubber 30 is shorter than the length u of the recess 23 so as to be slidable in the bridge axis direction inside the recess 23. The upper surface is processed with PTFE (low friction material). In the figure, reference numeral 32 denotes a PTFE (Teflon) coating. As shown in FIG. 12, a thick steel plate 31 (SS400) is embedded in the upper part and the lower part in the inside.

In order to install the steel stopper 1 with a cushioning function, a buried hole (not shown) for burying the downward anchor 13 at the time of constructing the abutment A is provided, and the buried hole is previously assembled in a factory. Steel stopper 1 with cushioning function (a cushion rubber 30 between upper and lower plates 10 and 10).
Is inserted), the downward anchor 13 is inserted. Next, concrete is poured into the buried hole in such a state. Next, the formwork of the bridge girder G is assembled so as to embed the upward anchor 24 extending upward from the upper surface of the upper glue 20, and concrete is poured. As described above, the steel stopper 1 with the buffer function can be installed between the bridge girder G and the abutment A.

Next, the operation of the steel stopper 1 with a buffer function will be described with reference to FIGS. 13 to 1
6 shows a state in which the lower plate 10 does not move and only the upper side 20 moves (to the left as viewed in the drawing). Also, in order to make the deformation of the cushioning rubber 30 easily visible, only the right half of the stopper 1 made of a cushioning function made of steel is viewed in a sectional view as viewed in the drawing.

When relative movement occurs between the bridge girder G and the abutment A from the settling state shown in FIG. 13, as shown in FIG.
The cushion rubber 30 slides in the recess 23 in the bridge axis direction without being deformed, and abuts on the end face 23 a of the recess 23. In addition,
According to the above construction method, the load of the bridge girder G is not applied to the cushion rubber 30.

When the relative movement increases, the cushion rubber 30 is deformed as shown in FIG.

When the relative movement further increases, as shown in FIG. 16, the stopper 11 comes into contact with the contact piece 22, and the relative movement does not increase any more, and at the same time, the deformation of the cushion rubber 30 stops.

The above operation will be described in terms of the amount of displacement based on the above design example. First, the transition from the state of FIG. 13 to the state of FIG. 14 is 120 mm (uv = 240, 240/240).
2 = 120 mm).

Next, a transition from the state of FIG. 14 to the state of FIG. 15 takes 20 mm ((st)-(uv) = 40).
mm, one side is 40/2 = 20 mm)). That is, the deformation amount of the cushion rubber 30 is 20 mm.

After shifting to the state shown in FIG. 16, the relative movement does not increase. Such an operation can prevent a bridge from being dropped.

Since the steel stopper 1 with the shock absorbing function according to the embodiment is configured as described above, the following effects can be obtained.

Even when a relative movement in the bridge axis direction occurs between the bridge girder G and the abutment A during an earthquake or the like, the shock absorbing rubber 30 can prevent the impact force from being applied to the stopper 11.

The cushion rubber 30 also functions as a seismic isolation device before the stopper 11 comes into contact with the upper surface 20.

In general, the upper area of the lower structure including the abutment A is small, and the size of the lower plate 10 cannot be increased. However, in the steel stopper 1 having the buffer function, the concave portion 23 is provided in the upper surface 20 and the upper surface 20 is formed. Since the lower plate 10 is configured to be smaller than the lower plate, the lower plate 10 can also be installed in a lower structure where the installation space is small.

The cushioning force can be easily changed by changing the spring constant of the cushioning rubber 30.

Further, a steel plate 31 is provided on the cushion rubber 30.
Is embedded, it is possible to prevent unequal deformation of the cushion rubber 30.

As for the relative movement (displacement due to wind, live load, etc.) at all times, only when the cushion rubber 30 moves inside the recess 23 or when the cushion rubber 30 is deformed,
There is no restriction on relative movement. Further, even when the bridge girder expands and contracts due to drying and shrinkage, expansion and contraction are not similarly limited.

Further, since the lower plate 10 is provided with the fitting hole 12, the buffer rubber 30 can be fixed to the plate with the buffer rubber 30 simply by fitting the buffer rubber 30 into the fitting hole 12.

Further, by setting the lower plate 10 and the upper roller 20 so as to be shifted from each other, it is possible to adjust the amount of movement (the amount of expansion and contraction of the bridge girder G) depending on the temperature during construction.

Since the PTFE is processed, the cushion rubber 30 can slide smoothly. Therefore, it is possible to prevent the shock-absorbing rubber 30 from being sheared due to the constant relative movement.

Further, since the PTFE is processed on the upper surface of the cushion rubber 30 and the upper area of the cushion rubber 30 is smaller than the area of the top surface of the recess 23, the top surface of the recess 23 is processed more than the case where the top surface of the recess 23 is processed by PTFE. It can be manufactured at low cost.

Further, since the concave portion 23 which opens downward is provided on the lower surface of the upper surface 20, dust and the like do not enter, and a cover or the like for preventing dust and the like from entering is unnecessary.

Note that, in the present embodiment, the present invention is not limited thereto, and can be suitably applied in applying the present invention.

Further, the steel stopper 1 with a shock absorbing function according to the present invention can also be used for a steel girder. Steel girder
When fixing 0, it may be performed by a method suitable for carrying out the present invention, such as bolting.

Further, a stopper 11 is provided on the upper surface 20,
A notch 21 may be provided in the lower plate 10.

Further, the elastic cushioning material may be fixed to the lower surface of the upper surface 20 and the concave portion 23 may be provided on the upper surface of the lower plate 10.

The upper plate 20 can be fixed to the lower structure, and the lower plate 10 can be fixed to the bridge girder G.

Further, a stainless steel plate can be stuck instead of PTFE.

The low-friction material is not limited to PTFE, but may be a material suitable for practicing the present invention, such as a stainless steel plate.

Further, a low friction material can be provided in the concave portion 23. Further, a low friction material may be provided in both the concave portion 23 and the elastic cushioning material.

Further, a space may be provided between the upper surface of the elastic cushioning material and the lower surface of the recess 23 with a gap. In such a case, the elastic cushioning material can be smoothly slid in the bridge axis direction without providing the bottom friction material. As a method for providing the gap, after inserting the elastic cushioning material into the concave portion 23, the gap between the upper surface of the elastic cushioning material and the lower surface of the concave portion 23 is formed between the upper cushion 20 and the lower plate 10 so as to leave a gap. What is necessary is just to interpose the temporary fixing piece and perform the installation work on the lower structure.

Further, as the elastic buffering member, a material suitable for practicing the present invention, such as a rubber material in which a steel plate is not embedded, a laminated rubber, a spring, a hydraulic damper, etc., can be used.

In this embodiment, the fitting hole 1
2, the cushioning rubber 30 is fixed. However, the elastic cushioning member can be fixed to the lower plate 10 by a method suitable for carrying out the present invention, such as fixing, fusion, and bolt fixing.

Further, the fitting hole 12 can be elongated in the bridge axis direction. In such a case, the elastic buffer material slides even in the fitting hole 12, so that a large stroke can be taken until the stopper comes into contact with the contact piece.

The number, position, shape, and the like of the above-mentioned constituent members are not limited to the above-described embodiment, but can be set to a number, position, shape, and the like suitable for carrying out the present invention.

Also, fixed bearings, movable bearings, distributed bearings, etc.
The present invention can be applied to a support structure suitable for carrying out the present invention.

In each of the drawings, the same components are denoted by the same reference numerals.

[0053]

Since the present invention is configured as described above, the following effects can be obtained.

According to the first, second and seventh aspects of the present invention, the elastic cushioning member is provided, and the elastic cushioning member is deformed before the stopper comes into contact with the abutting piece, thereby buffering an impact force due to an earthquake or the like. The device, as well as the bridge girder or the pier or abutment, can be prevented from being destroyed.

According to the third aspect of the present invention, since it is possible to fix the steel stopper having the cushioning function simply by fitting the cushioning material into the fitting hole, the work for assembling the steel stopper having the cushioning function can be easily performed. Can be.

According to the fourth aspect of the present invention, since the low friction material is further provided, the sliding inside the concave portion of the elastic cushioning material can be made smooth.

According to the fifth and eighth aspects of the present invention, since a gap is provided between the elastic cushioning member and the concave portion,
Sliding inside the concave portion can be made smooth without applying a high load to the elastic cushioning material.

In the invention according to claim 6, since the insertion hole is a hole elongated in the bridge axis direction, the amount of relative movement between the bridge girder and the abutment in the bridge axis direction can be increased.

[Brief description of the drawings]

FIG. 1 is a mounting front view of a steel stopper with a shock absorbing function installed between a bridge girder and an abutment according to the present invention.

FIG. 2 is a mounting side view of a steel stopper with a cushioning function installed between a bridge girder and an abutment according to the present invention.

FIG. 3 is a front view of a steel stopper with a cushioning function according to the present invention.

FIG. 4 is a side view of a steel stopper with a buffer function according to the present invention.

FIG. 5 is a plan view of a lower plate of a steel stopper having a buffer function according to the present invention.

FIG. 6 is a front view of a lower plate of a steel stopper with a shock absorbing function according to the present invention.

FIG. 7 is a side view of a lower plate of a steel stopper with a shock absorbing function according to the present invention.

FIG. 8 is a plan view of the upper stopper of the steel stopper having a buffer function according to the present invention.

FIG. 9 is a front view of the upper stopper of the steel stopper with a buffer function according to the present invention.

FIG. 10 is a plan view of a buffer rubber of a steel stopper having a buffer function according to the present invention.

FIG. 11 is a front view of a cushion rubber of a steel stopper having a cushion function according to the present invention.

FIG. 12 is an enlarged vertical cross-sectional view of a buffer rubber of a steel stopper having a buffer function according to the present invention.

FIG. 13 is a partially sectional side view showing the operation of the steel stopper with a shock absorbing function according to the present invention.

FIG. 14 is a partial sectional side view showing the operation of the steel stopper with a cushioning function according to the present invention.

FIG. 15 is a partially sectional side view showing the operation of the steel stopper with a shock absorbing function according to the present invention.

FIG. 16 is a partially sectional side view showing the operation of the steel stopper with a cushioning function according to the present invention.

[Explanation of symbols]

 G Bridge girder A Abutment (lower structure) B Rubber bearing 1 Steel stopper with cushioning function 10 Lower plate 11 Stopper 12 Insertion hole 13 Downward anchor 20 Upper side 21 Notch 22 Contact piece 23 Recess 23a End face 24 Upward anchor s Contact piece Interval t Stopper length u Concave length v Buffer rubber length 30 Buffer rubber 31 Steel plate 32 PTFE coating

Claims (8)

[Claims] 1. A steel with a buffer function, which is provided between a bridge girder and a lower structure such as a pier and an abutment for supporting the bridge girder, and restricts relative movement between the bridge girder and the lower structure to prevent a dropping bridge. A lower plate fixed to an upper surface of the lower structure, an upper surface fixed to an end lower surface of the bridge girder, and provided with a concave portion that opens to the lower surface in the fixed state; A lower portion is fixed to an upper surface of the lower plate, an upper portion is inserted into the concave portion, and is interposed between the upper and lower plates so as to be slidable at least in a bridge axis direction inside the concave portion. An elastic cushioning material that is shorter than the length of the recess in the bridge axis direction; a stopper extending upward is provided on the lower plate; and the upper bridge is provided between the bridge girder and the lower structure. Relative movement in the bridge axis direction In this case, a pair of abutting pieces with which the stopper comes into contact are provided at intervals in the bridge axis direction, and the difference between the interval between the abutting pieces and the length of the stopper in the bridge axis direction is the bridge of the recess. It is longer than the difference between the length in the axial direction and the length in the bridge axis direction of the elastic cushioning material, and the elastic cushioning material abuts on the end face of the concave portion before the stopper comes into contact with the abutting piece. Steel stopper with cushioning function. 2. A steel with a buffer function provided between a bridge girder and a lower structure such as a bridge pier or an abutment for supporting the bridge girder to limit a relative movement between the bridge girder and the lower structure to prevent a falling bridge. A lower plate fixed to an upper surface of the lower structure, an upper surface fixed to an end lower surface of the bridge girder, and provided with a concave portion that opens to the lower surface in the fixed state; A lower portion is fixed to an upper surface of the lower plate, an upper portion is inserted into the concave portion, and is interposed between the upper and lower plates so as to be slidable at least in a bridge axis direction inside the concave portion. An elastic cushioning material that is shorter than the length of the recess in the bridge axis direction; a stopper extending downward is provided on the upper shaft; and the lower plate is provided between the bridge girder and the lower structure. Relative movement in the bridge axis direction In this case, a pair of abutting pieces with which the stopper comes into contact are provided at intervals in the bridge axis direction, and the difference between the interval between the abutting pieces and the length of the stopper in the bridge axis direction is the bridge of the recess. It is longer than the difference between the length in the axial direction and the length in the bridge axis direction of the elastic cushioning material, and the elastic cushioning material abuts on the end face of the concave portion before the stopper comes into contact with the abutting piece. Steel stopper with cushioning function. 3. The lower plate is provided with a fitting hole into which a lower portion of the elastic buffer material can be fitted, and the elastic buffer material is fitted and fixed in the fitting hole. 3. The steel stopper with a buffer function according to any one of 2. 4. The steel stopper with a shock-absorbing function according to claim 1, wherein a low-friction material is provided on at least one of the concave portion and the elastic shock-absorbing material. 5. The steel stopper with a shock-absorbing function according to claim 1, wherein the stopper is interposed between the elastic shock-absorbing member and the recess with a gap therebetween. 6. The stopper according to claim 3, wherein the insertion hole is a hole that is long at least in a bridge axis direction. 7. The elastic cushioning material is fixed to the lower surface of the upper roller instead of the upper surface of the lower plate, and the concave portion is provided on the upper surface of the lower plate instead of the lower surface of the upper roller. The steel stopper with a buffer function according to claim 1. 8. The steel stopper with a cushioning function according to claim 7, wherein a gap is provided between the elastic cushioning member and the lower plate with a gap therebetween.