JP2018178475A - Fixture for movement restraining device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem in which: a bridge pier is often supported by a bearing; therefore, the bridge pier moves separately from a bridge girder, but when it moves too far, there are cases where large damage such as a drop of the bridge girder occurs; in order to prevent this, a movement restraining device is provided so that it cannot move more than a certain amount; anchor pins are used to suppress the movement, but it is difficult to fix the anchor pins.SOLUTION: A fixture for a movement restraining device used for restraining lateral movement of a bridge girder supported by a bearing is one in which a pin is inserted and fixed in a recess of a pedestal fixed by a fixing anchor buried in bridge pier concrete. The pedestal comprises a bottom plate, a plurality of upright plates erected on the bottom plate, and a base portion for providing the recess.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a fixture for a movement suppression device.

The fixing device for the movement suppression device mentioned here is used for a bridge pier, and is for restricting the movement in the horizontal direction due to an earthquake.
The bridge piers use bearings to absorb the misalignment between the bridge pier and the bridge beam due to temperature changes and other reasons. This is to prevent structural destruction even when the bridge pier and bridge girder are slightly shifted.

  However, if you can move freely in the horizontal direction, you can move significantly even if you do not break the structure with great force due to earthquakes etc., so you may miss support or hit another structure. . In such a case, since the bridge itself is heavy, it may cause great damage.

Therefore, in many cases, a regulating device is provided so as not to move beyond a certain level. There exist what makes a relative distance of a bridge pier side and a bridge girder side a fixed distance, and a thing which gives great resistance to relative movement.
What makes it a fixed distance is a thing like patent document 1, provides a fixed pin in a bridge pier, and provides the bridge girder with a control tool with a fixed space | gap. If it is in the fixed space, the fixing pin can move, can absorb the force, and can not move beyond the space.

  In addition, those that have large resistance to movement are those that connect the bridge pier side and bridge bridge side horizontally via a spring in a horizontal manner, or connect via a small hole in a large viscous liquid such as oil. is there.

  Those of the prior art that have high resistance are relatively expensive and are often damaged when moved vertically, if moving diagonally rather than moving horizontally.

Further, in Patent Document 1, a pedestal (made of concrete) is provided on a bridge pier, and a fixing pin is deeply embedded in both of the pedestals (FIG. 4 of Patent Document 1). In this case, in order to firmly fix the pedestal to the concrete of the bridge pier, it is necessary to arrange the reinforcement. Simply placing the formwork on the bridge pier and pouring the concrete is not strong.
Therefore, the bridge piers are also cut out largely, and sufficient arrangement of rebars is required, and a formwork is also provided to cast concrete, which is a great effort. Also, when installing on a bridge that has already been built, it is often impossible to secure a space for installation.

Japanese Patent Application Publication No. 2007-040097

  Therefore, a fixing device for a movement restraining device that can be used for a restricting device is provided that does not require time and effort as in Patent Document 1 and is not vulnerable to vertical movement such as a type that gives a large resistance.

  In view of the above situation, the inventor of the present invention has completed the fixture for the movement restraining device of the present invention as a result of earnest research, and the feature of the present invention is to use for suppressing horizontal movement of the bridge girder supported by the bearing. In a fixing device for a movement restraining device, a pin is inserted and fixed in a recess of a base fixed by a fixing anchor embedded in a pier concrete, and the base stands upright on a bottom plate and the bottom plate. And a base portion for providing the recess.

  The bridge girder is often supported movably (horizontally) relative to the bridge pier or the like due to temperature differences and various causes. A support device which supports in this manner at least horizontally movably is a support. The shape, the material, the supporting method and the like are free, and are not the gist of the present invention.

  The bridge girder referred to here refers to the superstructure and is not limited to any part. In addition, a bridge pier is used as a word including an abutment. The movement suppression device is to suppress movement of the bridge girder with respect to the bridge pier by a predetermined distance or more, and is not merely one that is given resistance but physically restricts movement. Movement is mainly due to earthquakes and other forces.

  The movement restraining device fixing tool is used for the above-described movement restraining device, and is fixed to the bridge pier, given a certain degree of freedom, and engaged with the bridge girder. Therefore, it is necessary that the fixing device for movement suppression device be firmly fixed to the bridge pier. It needs to be strong enough to stop the movement of a very heavy bridge girder.

  The pin referred to here is a portion engaged with the bridge girder, and when a part of the bridge girder abuts on this pin, it becomes resistance to movement of the bridge girder. The shape is free, and a bar of circular cross section may be used, but a square bar may be used. In addition, it may be screwed with a cross section round bar. The length may be determined by the size of the movement suppression device.

  The pin is a portion directly (or indirectly) in contact with the bridge girder, and the present invention is a structure of how to support the pin. Therefore, in order to protect the pin itself and the screw, a protector may be provided on the pin. For example, it is a donut-like hard rubber shock absorber or the like.

The mount referred to here is for fixing the pin. This gantry basically comprises a bottom plate, a standing plate and a base portion.
The bottom plate is a portion of the bottom placed on the bridge pier. Here, a through hole through which a fixing anchor to be described later passes is provided. The shape of the bottom plate may be any shape in plan view, and is preferably a polygon such as a square or a circle. In terms of materials, steel is common, and the size varies depending on the size and weight of the bridge girder, but is generally 30 to 60 cm × 30 to 60 cm in plan view. Although thickness is also free, it is about 2 to 4 cm.

Anchoring anchors are anchors embedded in a bridge pier and are anchor bolts and anchor rods. The length (embedding length) of this anchor is about 15 times its diameter, but it is shallower than the embedded anchor pin due to the difference in the number of arrangements and the diameter compared to the type in which the conventional anchor pin itself is embedded. It is clear that it is also good. In addition, the reduction of the diameter of the hole for embedding also contributes to the improvement of the installation condition. The embedding depth is not limited but is about 30 to 80 cm, and the diameter of the embedding hole is about anchor diameter + 1 cm. It is sufficient if the buried length can be secured as a whole. The upper part should be a screw.
Also, the size is not limited, but
Anchor for fixation: Diameter 2 cm-6 cm, length 40 cm-90 cm
Pin: Diameter 3 cm-15 cm, length 50 cm-150 cm
Is preferred.

The standing plate is for reinforcing the bottom plate and is provided at right angles to the bottom plate. The size is about 1/10 to 1/2 of the bottom plate in area. The height is about 1 to 10 cm. The presence of the vertical plate greatly reduces deformation and cracking of the bottom plate.
This standing plate may be provided so that at least two sheets are orthogonal to each other in plan view. This is because bending in either direction is strong. The number of standing plates is also free, but two or four are preferable.

  The base portion is a portion where a recess described later is provided. The base portion is a portion that receives the pin and easily fixes the pin so as not to fall, and is usually made of thick steel. Even if it is another member which provided the crevice, a part of standing board may be combined.

  The above components may be formed by welding each to the bottom plate or may be manufactured integrally. In short, the manufacturing method is not limited.

The recess is a portion into which the pin is inserted, and may have a through hole or a bottom. The recess may be a female screw. In this case, the pin is a male screw. The pin may be fixed by simply screwing in the above-mentioned screw or by inserting one or more nuts. If it is not a screw, welding or other fixing method may be used.
Moreover, it is not necessary to make it free and fix only by inserting. This is because the influence on the gantry becomes smaller when it is free, and thereby the gantry can be made smaller, which may result in a rational structure as a whole.

  As a method of fixing the gantry to the bridge pier, the above-described anchor for fixing may be passed through the through hole of the bottom plate and fixed by a nut or the like. This may also be a double nut. Of course, welding may be used, but it takes time and effort to remove it.

The present invention has the following effects.
(1) Since it is not necessary to drive a deep anchor into the pier concrete, it is easy when installing on the existing pier.
(2) The need for concrete pedestals and the need for time-consuming arrangements of reinforcements are eliminated. In the case of the existing bridge, since the installation place is limited in the first place, the reinforcement itself is often difficult.
(3) It is easy to repair and replace when the pin is damaged.

It is a perspective view of the fixing tool of this invention movement suppression apparatus. It is a longitudinal cross-sectional view of the center part of FIG. It is an example of the mount frame used for this invention, (a) is a perspective view, (b) is a top view. It is an example of the mount frame used for this invention, (a) is a perspective view, (b) is a top view. It is an example of the mount frame used for this invention, (a) is a perspective view, (b) is a top view. It is a perspective view which shows the example of use of this invention.

The present invention will be described in more detail below based on the drawings.
FIG. 1 is a perspective view of a fixture 1 for movement suppression device of the present invention. A base 3 is provided at the center of the bottom plate 2. Standing plates 4 extend in four directions from the base portion 3. In this example, the base portion 3 and the standing plate 4 are integrally molded. These materials are common steel materials. There is a recess 5 at the center of the base 3 and the pin 6 is fixed there.

  There are through holes 7 at the four corners of the bottom plate 2, and fixing anchors 8 are fitted there and fixed by nuts 9. Furthermore, a hard rubber 10 is fitted in the pin 6 to which a part of the bridge girder 11 abuts.

  FIG. 2 is a longitudinal sectional view of the central portion of FIG. Both ends of the pin 6 are screws, and the recess 5 of the base 3 is also a female screw. It is screwed in and fixed there. The hard rubber 10 is donut-shaped, and is installed in a shape in which a part of the pin 6 is wound.

  FIGS. 3 to 5 show an example of a gantry used in the present invention, where (a) is a perspective view and (b) is a plan view. In the case of FIG. 3A, there is a square pole base 3 at the center and a recess 5 at the center. The recess 5 may be a through hole.

  FIG. 4 is a view similar to FIG. 3, but eight upright plates 4 extend from the base 3 in four directions. The bending strength of the bottom plate 2 is improved. FIG. 5 is also a view similar to FIG. 3, but it is an example in which the base portion 3 is large and the recess 5 is not at the center.

FIG. 6 shows an example in which the fixing device for movement suppressing device of the present invention is used for the movement suppressing device 12 attached to the bridge girder 11 (only a part of the lower part of the bridge girder is shown). The movement suppression device 12 is a triangular plate, and is fixed to the bridge girder 11 with a bolt. There is a through hole 13 at the tip, and the pin 6 of the present invention passes through the through hole 13. The through hole 13 is larger than the diameter of the pin 6, and the movement suppressing device 12 is movable in the range. However, if it moves further, the pin 6 is hit and the movement is controlled. The size of the through hole 13 may be determined by the movement allowable distance.
There are also cases where the movement restraining device 12 is passed between two bridge girders and both ends are fixed by bolts, but the shape of the movement restraining device 12 at this time is basically rectangular, and the through hole 13 is The structure is located in the middle part.

REFERENCE SIGNS LIST 1 fixing device for movement suppressing device 2 bottom plate 3 base portion 4 standing plate 5 recessed portion 6 pin 7 through hole 8 fixing anchor 9 nut 10 hard rubber 11 bridge girder 12 movement suppressing device 13 through hole

Claims (6)

A fixture for a movement restraining device used to suppress horizontal movement of a bridge girder supported by a support, wherein a pin is inserted and fixed in a recess of a gantry fixed by a fixing anchor buried in a pier concrete, A fixture for a movement suppression device, comprising: a base plate, a plurality of upright plates provided upright on the base plate, and a base portion for providing the recess. The fixing device for movement suppression device according to claim 1, wherein the fixing anchor is two or more. The fixture for movement suppression device according to claim 1 or 2, wherein the plurality of standing plates are orthogonal to each other in plan view. The fastener for movement suppression device according to any one of claims 1 to 3, wherein a threaded portion which is a part of the pin is fastened to an internal thread portion of a recess of the gantry. The fixing device for a movement suppression device according to any one of claims 1 to 4, wherein a part of the pin is embedded in concrete. The fixture for movement suppression device according to any one of claims 1 to 5, wherein the pin is free from the mount.

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