JP2017197916A - Repair method and repair structure for bridge falling prevention device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide simple repair method and repair structure for a bridge falling prevention device.SOLUTION: An existing bridge falling prevention device includes an existing side surface plate 101A fitted on both side surfaces of a bridge girder structure 100, an existing bottom surface plate 101B provided on a bottom surface of the bridge girder structure, an existing bolt material 104 penetrating through the existing side surface plate 101A and the bridge girder structure 100, and double nut materials 102, 103 screwed at both ends of the existing bolt material 104. When repairing the bridge falling prevention device, the existing bottom surface plate 101A and the double nut materials 102, 103 are removed first. Then, a new side surface plate 1 is disposed along the existing side surface plate 101A and a new nut material 6 is screwed on both ends of the existing bolt material 104, the new side surface plate having an extension part 1A extending downward of a bottom edge of the existing side surface plate 101A. Furthermore, a new bottom surface plate 2 is disposed along a bottom surface of the bridge girder structure 100, the new bottom surface plate having an extension part 2A extending downward on both side edge parts. The extension part 1A of the new side surface plate 1 and the extension part 2A of the new bottom surface plate 2 are joined.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for repairing an existing falling bridge prevention device provided in a bridge structure and a repair structure of the falling bridge prevention device.

  For example, as shown in FIG. 1, the bridge structure includes a bridge girder structure 100, a support structure 110, and the like. The support structure 110 is a structure that supports the bridge girder structure 100. Examples of the support structure 110 include an abutment structure and a pier structure.

  When a large impact is applied to the bridge structure during an earthquake or the like, the bridge girder structure 100 may fall off the support structure 110 (see, for example, Patent Document 1).

  Therefore, the bridge structure is provided with a falling bridge prevention device. This falling bridge prevention device is provided with a pair of fixtures 105 and 107. One fixing tool 105 is fixed to the bridge girder structure 100. The other fixture 107 is fixed to the support structure 110. And the fixing tool 105 and the fixing tool 107 are connected by the connection means 106 which consists of a chain, a wire, etc.

  When the bridge structure is provided with the falling bridge prevention device, the movement of the bridge girder structure 100 away from the support structure 110 is suppressed. Therefore, the risk that the bridge girder structure 100 will slip from the support structure 110 is reduced.

  However, in recent years, deterioration of the falling bridge prevention device has been reported. In the fallen bridge prevention device in which this deterioration has been reported, the fixing relationship between the bridge girder structure 100 and the fixture 105 is as follows.

  First, as shown in FIG. 2, the fixture 105 is integrally formed with the existing lower surface plate 101B arranged along the lower surface of the bridge girder structure 100, or is joined to the existing lower surface plate 101B. Further, the existing lower surface plate 101B is integrally formed with a pair of existing side surface plates 101A disposed along both side surfaces of the bridge girder structure 100, or is joined to the pair of existing side surface plates 101A. Further, the pair of existing side plates 101 </ b> A are bolted to the bridge girder structure 100 by existing bolt members 104 and double nut members (first nut member 102 and second nut member 103). In this way, the fixture 105 is firmly fixed to the bridge girder structure 100.

  However, according to the above report, the boundary portion (indicated by symbol A in the figure) between the existing side plate 101A and the existing bottom plate 101B is deteriorated. If the boundary portion A is deteriorated, there is a possibility that the existing lower surface plate 101B is peeled off from the lower surface of the bridge girder structure 100 in the event of an earthquake or the like. If the existing lower surface plate 101B is peeled off, the risk of the bridge girder structure 100 slipping from the support structure 110 naturally increases.

  In order to prevent such a situation, it is also one hand to remove the existing fall prevention device and install a new fall prevention device (replacement of the fall prevention device). However, replacement of the fallen bridge prevention device is cumbersome. In view of the large number of this kind of falling bridge prevention device, it is preferable to repair the falling bridge prevention device.

Japanese Patent Publication No.46-6267

  SUMMARY OF THE INVENTION The main problem to be solved by the present invention is to provide a simple repair method and repair structure of a bridge prevention device.

  In examining the solution of the above problem, various methods can be considered as long as it is sufficient that no deteriorated portion (boundary portion A) exists. However, the position, strength, and the like of the connecting means 106 are strictly designed. If the position of the connecting means 106 is shifted due to repair, the strength of the falling bridge prevention device is affected. The means for solving the following problems has been conceived under such a premise.

(Aspect of Claim 1)
A pair of existing side plates provided on both sides of the bridge girder structure;
An existing bottom plate provided on the bottom surface of the bridge girder structure;
An existing bolt material penetrating the pair of existing side plates and the bridge girder structure;
A double nut material screwed into both ends of the existing bolt material;
A method for repairing a fallen bridge prevention device having
Removing the existing bottom plate and the double nut material;
A new side plate having an extending portion extending downward from the lower end edge of the existing side plate is disposed along the existing side plate,
The new nut material is screwed to both ends of the existing bolt material,
A new bottom plate having an extending portion extending downward at both end portions is disposed along the bottom surface of the bridge girder structure,
Joining the extension part of the new side plate and the extension part of the new bottom plate,
A method for repairing a fallen bridge prevention device.

(Aspect of Claim 2)
The joining of the extending part of the new side plate and the extending part of the new bottom plate is performed by bolt joining.
The repair method of the fallen bridge prevention apparatus of Claim 1.

(Aspect according to claim 3)
A pair of existing side plates provided on both sides of the bridge girder structure;
A pair of new side plates, each having an extending portion extending downward from the lower end edge of the pair of existing side plates, and each being disposed along the pair of existing side plates;
The pair of new side plates, the pair of existing side plates, and the existing bolt material penetrating the bridge girder structure,
A new nut material screwed to both ends of the existing bolt material,
A new lower surface plate having an extending portion extending downward at both end portions and disposed along the lower surface of the bridge girder structure;
A joining member that joins the extending portion of the new side plate and the extending portion of the new bottom plate;
A structure for repairing a fallen bridge prevention device, characterized by comprising:

  According to the present invention, a simple repair method and repair structure for a bridge failure prevention apparatus are provided.

It is a side view of the existing fallen bridge prevention apparatus. It is the II-II sectional view taken on the line of FIG. This is a repair structure for a fallen bridge prevention device. It is explanatory drawing which shows the procedure of the repair method of a fallen bridge prevention apparatus.

  Next, the form for implementing this invention is demonstrated. This embodiment is an example of the present invention. The present invention is not limited to the scope of this embodiment.

(Existing equipment for preventing falling bridges)
The method of this form repairs the existing fallen bridge prevention apparatus. For example, as shown in FIG. 2, the existing falling bridge prevention device to be repaired includes a face material 101 including a pair of existing side surface plates 101 </ b> A and an existing lower surface plate 101 </ b> B.

  One of the existing side plates 101 </ b> A is disposed along one side of the bridge girder structure 100. The other of the existing side plate 101 </ b> A is disposed along the other side surface of the bridge girder structure 100. The existing lower surface plate 101 </ b> B is disposed along the lower surface of the bridge girder structure 100.

  The existing side surface plate 101A and the existing lower surface plate 101B have, for example, a flat plate shape. Moreover, the planar shape of the existing side surface plate 101A and the existing lower surface plate 101B is, for example, a square shape.

  The existing side plate 101A and the existing lower surface plate 101B are made of, for example, a steel plate. The existing side plate 101A and the existing lower surface plate 101B of this embodiment are formed by bending a face material 1 made of a single steel plate. Therefore, the pair of existing side plate 101A and the existing lower surface plate 101B are integrally formed.

  However, the repair method of this embodiment can also be used when the pair of existing side plate 101A and the existing lower surface plate 101B are separate, and both 101A and 101B are connected by welding or the like.

  The thickness of the existing side plate 101A and the existing lower plate 101B is, for example, 20 to 100 mm, and 22 mm in this embodiment.

  The existing side plate 101 </ b> A and the existing lower surface plate 101 </ b> B may or may not be bonded to the bridge girder structure 100. That is, in any case, the repair method of this embodiment can be used (the same applies hereinafter).

  Further, the existing side plate 101A or the existing lower surface plate 101B and the bridge girder structure 100 may or may not be filled with an adhesive or filler made of epoxy resin, non-shrink mortar, or the like. Good.

  The existing lower surface plate 101B is provided with a fixture 105. The fixture 105 extends downward from the lower surface of the existing lower surface plate 101B.

  The existing lower surface plate 101B and the fixture 105 may be integrally formed or may be separately formed and connected by welding or the like.

  A connecting means 106 made of a chain, a wire or the like is connected to the fixture 105.

  The pair of existing side plates 101A are bolted to the bridge girder structure 100 by existing bolt members 104 and double nut members. Further, the double nut material is constituted by the first nut material 102 and the second nut material 103.

  The existing bolt material 104 passes through the pair of existing side plates 101 </ b> A and the bridge girder structure 100. And in this penetration state, the 1st nut material 102 and the 2nd nut material 103 are screwed together in this order to the both ends of the existing bolt material 104.

  The number of the existing bolt materials 104 is not particularly limited. The repair method of this embodiment can be used even if there is one or more than two.

(Repair method and structure)
Next, a procedure for repairing the existing fallen bridge prevention device described above will be described.
In repairing the existing falling bridge prevention device, first, as shown in FIG. 4B, the existing lower surface plate 101B is peeled off from the lower surface of the existing structure 100 (removal of the existing lower surface plate 101B).

  In the existing falling bridge prevention device of this embodiment, the existing side plate 101A and the existing lower surface plate 101B are formed from a single face member 101 as described above. Therefore, as shown in FIG. 4A, the existing side plate 101A and the existing lower surface plate 101B are connected in a state before repair. Therefore, when removing the existing lower surface plate 101B, it is preferable to cut the existing lower surface plate 101B and the existing side surface plate 101A.

  Further, when removing the existing lower surface plate 101B, it is preferable to remove the connecting means 106 in advance from the fixture 105 provided on the existing lower surface plate 101B. By removing the connecting means 106 in advance, repair work can be performed quickly.

  In the state where the existing lower surface plate 101B is removed, when an adhesive or filler such as epoxy resin or non-shrink mortar adheres to the surface of the bridge girder structure 100, this adhesive or filler is used as the bridge girder structure. It is preferably removed from the surface of 100. By removing the adhesive, the filler, and the like, the adhesion of the new lower surface plate 2 described later to the bridge girder structure 100 is improved.

  Next, the 1st nut material 102 and the 2nd nut material 103 currently screwed together by the both ends of the existing bolt material 104 are removed (removal of a double nut material). The removal of the double nut material can be performed prior to the work on the existing lower surface plate 101B or in parallel with the work on the existing lower surface plate 101B.

  Next, the surface of the existing side plate 101A is adjusted. By this substrate adjustment, the adhesion of the new side plate 1 described later to the existing side plate 101A is improved. This substrate adjustment can be performed prior to the removal of the double nut material or in parallel with the removal of the double nut material.

  Next, the new side plate 1 is disposed along the surface of the existing side plate 101A. In this respect, a bolt hole for the existing bolt material 104 is formed in the new side plate 1. Therefore, the new side plate 1 is arranged such that the end of the existing bolt material 104 penetrates the bolt hole of the new side plate 1.

  The planar shape of the new side plate 1 is the same as that of the existing side plate 101A except for an extending portion 1A described later. Therefore, the entire side surface 101 </ b> A is covered by the arrangement of the new side plate 1.

  The extending portion 1A of the new side plate 1 is a portion extending downward from the lower end edge of the existing side plate 101A in the arrangement state, as shown in FIG. The extending length of the extending portion 1A is, for example, 15 to 200 cm, preferably 30 to 150 cm.

  The thickness of the new side plate 1 is the same as the thickness of the first nut member 102. Therefore, even after the new side plate 1 is arranged, the new nut material 6 to be described later can be screwed onto both ends of the existing bolt material 104.

  When arranging the new side plate 1, it is preferable to fill the existing side plate 101 </ b> A and the new side plate 1 with an adhesive such as an epoxy resin or a filler. By filling with an adhesive, a filler or the like, the new side plate 1 is firmly fixed to the existing side plate 101A.

  Next, the new nut material 6 is screwed into both ends of the existing bolt material 104. By this screwing, the new side plate 1 is fixed to the bridge girder structure 100 via the existing side plate 101A. As described above, the nut member 6 can be screwed.

  The new nut material 6 is a double nut material (this double nut material may be the first nut material 102 and the second nut material 103 or another nut material from the viewpoint of preventing loosening. .) Can also be used. However, since the new side plate 1 is arranged on the surface of the existing side plate 101A, it is expected that the length of the existing bolt material 104 is insufficient. Therefore, it is preferable to use a U nut (a locking nut) as the new nut material 6. The U nut is replaced with the second nut material 103 in terms of position. In terms of position, the new side plate 1 is replaced with the first nut member 102.

  Next, the new lower surface plate 2 is disposed along the lower surface of the bridge girder structure 100.

  The planar shape of the newly installed bottom plate 2 is the same as the planar shape of the existing bottom plate 101B. However, the both end portions of the new lower surface plate 2 are provided with extended portions 2B extending downward. The length of the extending portion 2B is set to be equal to the extending portion 1A of the new side plate 1 described above in the arrangement state (see (4) in FIG. 4).

  When arranging the new lower surface plate 2, it is preferable to fill an adhesive such as an epoxy resin or a filler between the bridge girder structure 100 and the new lower surface plate 2. By filling with an adhesive, a filler, or the like, the new lower surface plate 2 is firmly fixed to the bridge girder structure 100.

  As shown in FIG. 3, the new lower surface plate 2 includes a fixture 105 similar to the fixture 105 provided on the existing lower surface plate 101 </ b> B. The fixture 105 extends downward from the lower surface of the newly installed lower surface plate 101B.

  The new lower surface plate 2 and the fixture 105 may be integrally molded or may be separately molded and connected by welding or the like.

  Finally, the extending portion 1A of the new side plate 1 and the extending portion 2A of the new lower surface plate 2 are joined. As shown in (4) of FIG. 4, this joining is preferably performed by bolt joining using a joining member composed of the joining bolt material 3 and the joining nut material 4.

  By this joining, the repair of the falling bridge prevention device is completed. Thereafter, by appropriately connecting the connecting means 106 made of a chain, a wire, or the like to the fixture 105, the falling bridge prevention device exhibits its effect. In this respect, since the position and the like of the connecting means 106 are not displaced at all by the above repairs, the effect of the falling bridge prevention device is the same as before (before deterioration of the falling bridge prevention device).

  Note that the various operations described above can be appropriately changed in order as long as they do not contradict the spirit of the present invention.

  INDUSTRIAL APPLICABILITY The present invention can be used as a method for repairing an existing falling bridge prevention device provided in a bridge structure and a repair structure of the falling bridge prevention device.

DESCRIPTION OF SYMBOLS 1 New side plate 1A Extension part (new side plate) 2 New bottom plate 2A (New bottom plate) extension part 3 Joint bolt material 4 Joint nut material 6 New nut material 100 Bridge girder structure 101 Face material 101A Existing side Face plate 101B Existing bottom plate 102 First nut material 103 Second nut material 104 Existing bolt material 105 Fixing tool (on the bridge girder structure side) 106 Connecting means 107 Fixing tool (on the support structure side) 110 Support structure

Claims (3)

A pair of existing side plates provided on both sides of the bridge girder structure;
An existing bottom plate provided on the bottom surface of the bridge girder structure;
An existing bolt material penetrating the pair of existing side plates and the bridge girder structure;
A double nut material screwed into both ends of the existing bolt material;
A method for repairing a fallen bridge prevention device having
Removing the existing bottom plate and the double nut material;
A new side plate having an extending portion extending downward from the lower end edge of the existing side plate is disposed along the existing side plate,
The new nut material is screwed to both ends of the existing bolt material,
A new bottom plate having an extending portion extending downward at both end portions is disposed along the bottom surface of the bridge girder structure,
Joining the extension part of the new side plate and the extension part of the new bottom plate,
A method for repairing a fallen bridge prevention device. The joining of the extending part of the new side plate and the extending part of the new bottom plate is performed by bolt joining.
The repair method of the fallen bridge prevention apparatus of Claim 1. A pair of existing side plates provided on both sides of the bridge girder structure;
A pair of new side plates, each having an extending portion extending downward from the lower end edge of the pair of existing side plates, and each being disposed along the pair of existing side plates;
The pair of new side plates, the pair of existing side plates, and the existing bolt material penetrating the bridge girder structure,
A new nut material screwed to both ends of the existing bolt material,
A new lower surface plate having an extending portion extending downward at both end portions and disposed along the lower surface of the bridge girder structure;
A joining member that joins the extending portion of the new side plate and the extending portion of the new bottom plate;
A structure for repairing a fallen bridge prevention device, characterized by comprising:

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