JP3763020B2 - Bridge reinforcement method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bridge reinforcing method.
[0002]
[Prior art]
Various proposals have been made to improve the earthquake resistance and reinforcement of bridges, but the reinforcement is performed directly or indirectly on structures such as floor boards and girders.
[0003]
[Non-Patent Document 1]
"Encyclopedia of Civil Engineering Law Revision V" September 4, 2001, Industrial Research Institute Encyclopedia Publishing Center, P1179-P1187
[0004]
[Problems to be solved by the invention]
In the present invention, the direct or indirect reinforcement of the structure such as the abutment, the girder, or the floor board in the above takes too much time and cost. A simple and efficient reinforcement force can be improved by mounting and arrangement.
[0005]
[Means for Solving the Problems]
In the present invention, when the girder material on the lower surface of the floor plate is installed between a pair of opposed abutments, a clasp post is erected on each abutment location, and the supporting steel is abutted in a direction orthogonal to the lower surface of the girder material. An upward reinforcing force is applied by a tension material such as a wire or a steel bar that spans between the clasps attached to each of the opposed abutments to the girder and the floor plate via the bearing steel. .
[0006]
At this time, the clasps at each abutment are inclined and arranged in a reverse symmetrical relationship in the opposite state, and the clasps on each side of each girder are sandwiched. It is assumed that
[0007]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an embodiment of the method of the present invention, FIG. 1 is a front view, and FIG. 2 is a sectional view taken along line XX of FIG. In each figure, 1 and 1 are abutments, 2 is a bridge constructed between the abutments 1 and 1, 2a is a floor plate, 2b and 2b are girders on the lower surface side.
[0008]
The above is the structure of the conventional bridge, but in the present invention, the clasp 3 is erected in parallel with the girder place to be placed on the abutments 1 and 1. At the time of standing, the upper end is positioned at the back end portion of the bridge floor plate from the fixed base position, and specifically, the base 3a is a little bit from the back end m of the bridge. and than forming an inclined state to position forward, is this is buckle struts 3,3 each record on abutments as a pair opposed seen in Figure 1 shall be fixed in a symmetrical relationship reverse c-shaped It is.
[0009]
4 is a tension material such as a wire or a steel bar spanned between the opposite clasps 3 and 3, and 5 is a bearing steel material arranged in the direction perpendicular to the lower surface side of the central portion of the girder 2b. Thus, the upward support pressure T is applied to the girder 2b and the floor board 2a by the tension force generated by tightening the tension member 4. 6 is a turn puckle as a tension fitting. In the above-described embodiment, one tension metal 6 is provided in the middle of the tension member 4, but the number is not limited to one and is two, or a structure that is attached near the fixing position of the general retainer post 3. Can be
[0010]
In the practice of the present invention, the clasp 3 is attached so that the edge portions of the girders 2b are placed on the abutments 1 and 1, and the girders 2b are sandwiched between the left and right positions. In other words, the present embodiment is implemented as shown in FIG. Thus, the fact that each of the clasps 3 is in a reverse C-shaped symmetrical relationship with each other is that the clasps 3 are in the center during the strong tightening action of the tension material 4 in the above. Even if a force that can be raised in the direction is applied, each clasp 3 is such that the apex of the arc on the trigger side with the base 3a as a base comes into contact with the lower surface of the floor plate 2a, and the tension material 4 It will serve as a limit stopper for the slack of the slack.
[0011]
The turn puckle used as the tension metal fitting 6 in the above is not limited to the illustrated example, but can be attached to a location of each clasp 3 and operated at the location. In addition, the number of items used, the number of wires used for the tendon material 4 or how to hang them can be arbitrarily designed and implemented.
[0012]
【The invention's effect】
The present invention is configured as described above, and aside from reinforcing the structure of the existing equipment itself, that is, the structure itself such as the floor board and the girders, first of all, the quick and simple reinforcement work in the present situation is required. It can be done automatically. Thus, the reinforcing force T is calculated by the product of the tension force (clamping force) P of the tension member 4 and the pulling angle α, and this is applied to the beam member 2b and the floor plate 2a via the bearing steel material 5. On the other hand, it acts as an upward reinforcing force T. At this time, the reinforcing force T can be changed by appropriately adjusting the height of the supporting steel material 5 and the tightening force of the tension material 4.
According to the experiment of the present inventor, the present invention can reinforce a traffic load of about 5 to 7 tons per one girder, and the construction period and cost are compared with the conventional construction method. It was possible to make it 1/10 or less.
[Brief description of the drawings]
FIG. 1 is a front view showing an embodiment of the method of the present invention.
2 is a cross-sectional view taken along line XX of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Abutment 2 Bridge 2a Floor board 2b Girder 3 Clasp post 4 Tension material 5 Bearing steel material 6 Tension bracket

Claims (2)

When the girders on the lower surface of the floor plate are installed between a pair of opposed abutments , the clasps are brought into contact with the heel side of the lower surface of the floor plate in a reversely symmetrical relationship with the clasps at each abutment location. In addition to fixing the lower end of the abutment on the abutment, the support steel is abutted in the direction orthogonal to the underside of the girder material, and is arranged in a symmetrical relationship with the reverse C shape with respect to the girder material and the floor plate via the support steel. A bridge reinforcement method characterized in that upward reinforcement force is applied with a tension material such as a wire or steel bar that spans between clasps.   2. The bridge reinforcing method according to claim 1, wherein clasps are provided on both sides of the girders.

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