JP2017201117A - Reinforcement structure and reinforcement method of a bridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforcement technique of bridge superior in workability at a low cost irrespective of the shape of a main girder.SOLUTION: The reinforcement structure includes, in a longitudinal direction of a main girder 5 of a bridge, a pair of vertical members 71 which are vertically connected to the main girder 5 from the bottom face of the main girder 5 while being separated from each other; and a tension member 72 that applies a tensioning force between the pair of vertical members 71. In the pair of vertical members 71 provided to the main girder 5, the vertical member 71A at one end side and the vertical member 71B at the other end side are connected by a bridge falling prevention member 8.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a bridge reinforcement technique for reinforcing a bridge and increasing load resistance.

  A bridge receives a large load and vibrates when passing through a vehicle. For this reason, with the lapse of time since construction, there is a concern that the proof stress will decrease due to the deterioration of the structural material of the bridge and the accumulation of material fatigue. In addition, even with relatively new bridges, with the revision of laws such as the design standards and the Road Traffic Law, the current use conditions may be insufficient in load capacity. As a countermeasure for bridges that have such problems inherently, the fundamental solution is to replace them, but it is not only expensive, but the use of the bridges must be stopped for a long period of time. .

  Therefore, a reinforcing technique for reinforcing the main girder of the bridge with tension is proposed. For example, in Patent Document 1, a steel wire is attached to support members attached to both side surfaces of a main girder, and the bridge is reinforced by tightening with nuts provided at both ends of the main girder to give tension. .

Japanese Patent Laid-Open No. 9-3823

  In the reinforcing structure described in Patent Document 1, it is necessary to attach a strand of PC steel to each side surface of the main girder, which has a problem in cost. Moreover, if the tension on one side and the tension on the other side are imbalanced, an unexpected stress is applied to the main girder and the durability of the bridge is deteriorated. Therefore, adjustment of both tensions is indispensable, and there was a problem in terms of workability. Moreover, when the main girder is curved as shown in FIG. 4 later, the reinforcing structure cannot be applied, and there is a problem in versatility.

  The present invention has been made in view of the above problems, and aims to provide a bridge reinforcement technique that can reinforce a bridge at low cost and with excellent workability regardless of the shape of the main girder. To do.

  A first aspect of the present invention is a bridge reinforcing structure, a pair of hanging members connected to the main girder while being suspended from the lower surface of the main girder while being separated from each other in the longitudinal direction of the main girder of the bridge, And a tension member that applies tension between the pair of hanging members.

  The second aspect of the present invention provides a bridge for reinforcing a bridge in which one end in the longitudinal direction of the first main girder and the other end in the longitudinal direction of the second main girder are supported on the pier. A reinforcing structure for each main girder, which is separated from each other in the longitudinal direction of the main girder and is suspended from the lower surface of the main girder and coupled to the main girder, and between the pair of hung members A tension member that provides tension, and a pair of suspended members provided on the first main girder and one pair of suspended members provided on the first main girder and a pair of suspended members provided on the second main girder Among the members, the hanging member on the other end side is connected by a fallen bridge preventing member.

  Furthermore, a third aspect of the present invention is a method for reinforcing a bridge, wherein a pair of suspended members are separated from each other in the longitudinal direction of the main girder of the bridge and connected to the main girder while hanging down from the lower surface of the main girder. And fixing one end of the tension member to one of the pair of hanging members and fixing the other end of the tension member to the other of the pair of hanging members. And a step of applying tension between them.

  In the invention configured as described above, a pair of hanging members is provided on the lower surface of the main girder, and a tension force is applied between the pair of hanging members by the tension member. The load force of the bridge is increased by reinforcement from the lower surface side of the main girder due to this tension.

  In the invention configured as described above, the load force of the bridge can be increased only by applying a tension force between the pair of suspending members, and has the following advantages over the prior art. . That is, the cost required for reinforcing the bridge can be suppressed. In addition, the adjustment work for reinforcing the bridge can be simplified, and the workability is excellent. Moreover, since it is only necessary to give tension to the pair of suspended members provided on the lower surface of the main girder, the present invention can be applied to a bridge having a main girder having an arbitrary shape, and has excellent versatility. Have.

It is a partial side view of a bridge to which a first embodiment of a reinforcing structure according to the present invention is applied. It is the bottom view which looked at the bridge of FIG. 1 from the downward direction. It is a perspective view which shows the hanging member which is one component of a reinforcement structure. It is the bottom view which looked at the bridge which applied 2nd Embodiment of the reinforcement structure concerning this invention from the downward direction. It is the bottom view which looked at the bridge which applied 3rd Embodiment of the reinforcement structure concerning this invention from the downward direction. It is a perspective view which shows the fixation condition of the tension | tensile_strength member and falling-bridge prevention member with respect to a suspending member in 3rd Embodiment.

  FIG. 1 is a partial side view of a bridge to which a first embodiment of a reinforcing structure according to the present invention is applied. FIG. 2 is a bottom view of the bridge of FIG. 1 as viewed from below. In FIG. 2, the abutment and the pier are indicated by broken lines. Further, FIG. 3 is a perspective view showing a configuration of a hanging member constituting the reinforcing structure. In this bridge 1, a plurality of piers 3 are linearly arranged between two abutments 2 (only the left end abutment is shown, and the right end abutment is not shown). The arrangement direction X of these abutments 2 and piers 3 coincides with the longitudinal direction of the main girder described later. In addition, a plurality of (in this embodiment, “3”) support portions 4 are placed on each bridge base of the abutment 2 and the pier 3 at a constant interval in the horizontal direction Y orthogonal to the direction X. Three pairs of support portions are provided between the abutment 2 and the adjacent pier 3, and three pairs of support portions are also provided between the piers 3 adjacent to each other. And the main girder 5 is mounted between each bearing part pair. That is, in each bearing part pair, one end part of the main beam 5 is placed on one of the bearing parts 4 and the other end part of the main beam 5 is placed on the other bearing part 4. ing. Although not shown, a horizontal beam and a vertical beam are provided for the plurality of main beams 5 provided as described above. And the floor slab 6 is provided on them.

  In the present embodiment, a reinforcing structure 7 is attached to each main girder 5 to increase the load resistance of the bridge 1. The reinforcing structure 7 includes a pair of suspended members 71A and 71B that are spaced apart from each other in the longitudinal direction X of the main beam 5 and are directly coupled to the main beam 5 while hanging from the lower surface 51 of the main beam 5. The tension member 72 which connects the members 71A and 71B and gives tension force is provided. As shown in FIG. 3, the hanging members 71 </ b> A and 71 </ b> B are each formed by integrating reinforcing ribs having an inverted right triangle shape with respect to the Y direction end of the I steel, and the upper plane portion 711 is the lower plane portion 712. It is slightly wider in the direction X, and is finished so as to be in close contact with the lower surface 51 of the main girder 5. The upper plane part 711 is attached to the main girder 5 by welding with the upper plane part 711 being in close contact with the lower surface 51 of the main girder 5. Thus, the hanging members 71A and 71B are directly and firmly connected to the main beam 5. Of course, a connection aspect is not limited to this, In addition to welding, you may comprise so that it may connect with fastening metal fittings, such as a volt | bolt.

  Moreover, in this embodiment, in each hanging member pair, the hanging members 71A and 71B are separated in the X direction by a length slightly shorter than the span length in the longitudinal direction X, as shown in FIG. The ribs are connected to the lower surface 51 of the main girder 5 so as to face each other. A tension member 72 is stretched between the hanging members 71A and 71B. In the present embodiment, the tension member 72 includes two PC steel bars 721, a coupler 722, and a fixing nut 723. The two PC steel bars 721 are connected by a coupler 722 to form a long body 724 having a length approximately equal to the interval between the hanging members 71A and 71B. And after inserting the one end part of the said elongate body 724 in the through-hole provided in hanging member 71A, and inserting the other end part in the through-hole provided in hanging member 71B, elongate body The fixing nut 723 is screwed and fixed to both ends of the 724, thereby tensioning the hanging members 71A and 71B. As a result, a stress that acts in a direction in which the main girder 5 is bent upward acts between the suspended members 71A and 71B, and thereby the load resistance of the bridge 1 is increased. In the present embodiment, two PC steel bars 721 are connected to each other corresponding to the span length, but when one PC steel bar 721 can tension between the suspended members 71A and 71B. In this case, it is not necessary to use the coupler 722, and the PC steel rod 721 can be used as the long body 724. On the contrary, when the span length is longer than two PC steel bars 721, the above-described long body 724 may be configured by preparing the number of PC steel bars 721 and couplers 722 corresponding to the span length. . Further, as the span length becomes longer, the deflection of the central portion of the long body 724 becomes larger due to its own weight, and the tension force is likely to fluctuate. Therefore, as shown in FIG. It is desirable to suspend the rod 721 (or coupler 722) from the main beam 5. Of course, when bending does not become a problem, the suspending member 73 is unnecessary. In this embodiment, the suspension member 73 includes a ring member 731 made of rubber or resin and a support bar 732 that suspends the ring member 731 on the main beam 5. The elongated member 724 is attached to the ring member 731. Is inserted and supported.

  In this embodiment, the abutment 2 and the reinforcing structure 7 are connected to the falling bridge prevention member 8. More specifically, the hanging member 71A closest to the abutment 2 (corresponding to the “hanging member on the abutment side” of the present invention) is used for preventing a falling bridge in addition to the above-described reinforcing through hole. A through hole (not shown) is provided. Then, the PC steel rod 81 of the falling bridge preventing member 8 attached to the abutment 2 is inserted into the through hole for preventing falling bridges and fixed to the hanging member 71A by the fixing nut 82. Thereby, the abutment 2 and the reinforcement structure 7 adjacent to the abutment 2 are connected.

  Further, the end portions of the two main girders 5 are placed on the bridge seats of the respective piers 3 via the support portions 4. Among these, the reinforcing structure 7 provided on one main girder 5 and the reinforcing structure 7 provided on the other main girder 5 are connected to each other by the falling bridge prevention member 8 in the same manner as described above. . That is, the hanging member 71B on the other side (right hand side in FIG. 1) and the other side (FIG. 1) constituting the reinforcing structure 7 on one side (for example, the left hand side in FIG. 1) of the reinforcing structures 7 adjacent to each other. A through-hole (not shown) for preventing a falling bridge is provided in the hanging member 71A on one side (the left hand side in FIG. 1) constituting the reinforcing structure 7 on the right hand side. Then, both ends of the PC steel rod 81 of the falling bridge preventing member 8 are inserted into through holes for preventing falling bridges of the hanging members 71A and 71B, respectively, and are fixed to the hanging members 71A and 71B by fixing nuts 725. Thereby, the adjacent reinforcement structures 7 are mutually connected. In this embodiment, the adjacent reinforcing structures 7 are connected to each other, but may be configured to be connected by the bridge pier 3 and the falling bridge prevention member 8 respectively.

  As described above, in the present embodiment, the pair of suspending members 71A and 71B are provided on the lower side of the main girder 5, and the suspending member 71A is provided by applying a tension force by the tension member 72 provided therebetween. , 71B, the main girder 5 is caused to act in a direction of bending upward, thereby increasing the load force of the bridge 1. For this reason, compared with the prior art which gave tension with respect to the both sides of main girder 5, the cost required for reinforcement of bridge 1 can be held down. Moreover, the adjustment work of reinforcement of the bridge 1 can be simplified, and excellent workability can be obtained. Further, since it is sufficient to apply tension to the pair of suspended members provided on the lower surface of the main girder 5, the main girder 5 has an arbitrary shape (for example, a curved main girder 5 as shown in FIG. 4). The present invention can be applied to the bridge 1 and has excellent versatility.

  Moreover, in the said embodiment, since each suspending member 71A, 71B is directly connected and integrated with the main girder 5, the tension force introduced between the suspending members 71A, 71B is given to the main girder 5. The load force of the bridge 1 can be increased efficiently.

  In addition, tension is applied between the pair of suspended members 71A and 71B suspended downward from the lower surface of the main girder 5, and tension is applied at a position away from the lower surface of the main girder 5, The increase in load force obtained by one reinforcing structure 7 is higher than that of the prior art, and efficient bridge reinforcement is possible.

  Further, tension is applied to the hanging members 71A and 71B, and the tension acts in a direction in which the hanging member 71A is tilted toward the hanging member 71B and the hanging member 71B is tilted toward the hanging member 71A. However, the suspending members 71A and 71B are connected to the falling bridge prevention member 8, and thereby the suspending members 71A and 71B are effectively prevented from falling. That is, the falling bridge prevention member 8 also exhibits a function of preventing the vertical members 71A and 71B from falling down in addition to the original mechanism, that is, the falling bridge prevention function.

  The present invention is not limited to the above-described embodiment, and various modifications can be made to the above-described one without departing from the spirit of the present invention. For example, in the above embodiment, the present invention is applied to the bridge 1 in which the abutment 2, the pier 3 and the main girder 5 are arranged in a straight line. However, as shown in FIG. Even when curved in plan view, by providing the reinforcing structure 7 on the lower side of the main girder 5, the same effect as that of the first embodiment can be obtained.

  In the first embodiment, the present invention is applied to the bridge 1 in which three main girders 5 are juxtaposed between the abutment 2 and the pier 3 and between the piers 3. In the second embodiment, the abutment 2 and Although the present invention is applied to the bridge 1 in which two main girders 5 are juxtaposed with the pier 3, the number of the main girders 5 is not limited to these and is arbitrary.

  In the embodiment shown in FIG. 2, the abutment and the hanging member 71 </ b> A are connected by one falling bridge prevention member 8, but for example, as shown in FIG. 5, the support part 4 is arranged so as to be sandwiched from the Y direction. Alternatively, the two fallen bridge prevention members 8 may be connected. In this case, as shown in FIG. 6, the fixing positions P8 and P8 of the falling-bridge preventing member 8 in the hanging member 71A are separated by a certain distance. Here, when the tension member 72 is constructed so that the fixing position P72 of the tension member 72 with respect to the hanging member 71A is located between the fixing positions P8 and P8, the stress acting on the hanging member 71A is balanced, and the bridge 1 Can be reinforced more stably. Moreover, since the support part 4 is inserted | pinched, a falling bridge can be prevented further effectively. The number of tension members 72 arranged between the two falling bridge prevention members 8 is not limited to one, but is arbitrary.

  As for these points, as shown in FIG. 5, each hanging member is also used when two hanging members 71 </ b> A and 71 </ b> B arranged opposite to each other with the bridge pier 3 interposed therebetween are connected by two falling bridge preventing members 8. In 71A and 71B, the tension member 72 may be constructed so that the fixing position P72 of the tension member 72 is located between the fixing positions P8 and P8, and the same effect as described above can be obtained. About these points, it is the same with respect to the bridge 1 shown in FIG.

  Moreover, in the above, although the case where the falling bridge prevention member 8 was set to two or more was demonstrated, it is the same also when increasing the number of the tension members 72. FIG. For example, when the two tension members 72 are fixed to the hanging members 71A and 71B, the fall bridge prevention member 8 is fixed between the two fixing positions, so that the same operation as described above is achieved. An effect is obtained. This is the same for the bridge 1 shown in FIG.

  Further, the number of tension members 72 between the hanging members 71A and 71B is not limited to one or two, but is arbitrary. Also, the number of the fallen bridge preventing member 8 that couples the abutment and the suspended member 71A and the fallen bridge preventing member 8 that couples the two suspended members 71A and 71B that are arranged opposite to each other with the pier 3 interposed therebetween are also reduced to one or two. It is not limited and is arbitrary.

  Moreover, in the said embodiment, although tension | tensile_strength is given between the suspending members 71A and 71B with the PC steel rod 81, a connecting member other than the PC steel rod 81, for example, a strand of PC steel can be used.

  The present invention can be applied to all reinforcement techniques for reinforcing a bridge by applying tension to a main girder.

DESCRIPTION OF SYMBOLS 1 ... Bridge 2 ... Abutment 3 ... Bridge pier 5 ... Main girder 7 ... Reinforcement structure 8 ... Falling bridge prevention member 51 ... (main girder) lower surface 71A ... (1st) Hanging member 71B ... (2) Hanging member 72 ... tension member 721 ... PC steel bar 81, 711 ... upper plane part X ... (main girder) longitudinal direction

A first aspect of the present invention is a bridge reinforcing structure, a pair of hanging members connected to the main girder while being suspended from the lower surface of the main girder while being separated from each other in the longitudinal direction of the main girder of the bridge, A tension member that applies tension between the pair of suspended members , one end of the main girder in the longitudinal direction is supported on the abutment, and the suspended member on the abutment side of the pair of suspended members prevents falling bridges It is connected to the abutment by a member .

Furthermore, a third aspect of the present invention is a method for reinforcing a bridge, wherein a pair of suspended members are separated from each other in the longitudinal direction of the main girder of the bridge and connected to the main girder while hanging down from the lower surface of the main girder. And fixing one end of the tension member to one of the pair of hanging members and fixing the other end of the tension member to the other of the pair of hanging members. A step of applying a tension force between them, a step of supporting one end portion of the main girder in the longitudinal direction on the abutment, and a step of connecting the suspension member on the abutment side of the pair of suspension members to the abutment by the falling bridge prevention member; It is characterized by having.

Claims (9)

A pair of suspended members coupled to the main girder while being suspended from the lower surface of the main girder in the longitudinal direction of the main girder of the bridge;
A reinforcing structure for a bridge, comprising: a tension member that applies tension between the pair of hanging members. The bridge reinforcing structure according to claim 1,
The hanging member is a reinforcing structure of a bridge that is directly connected to the main girder by a connecting metal fitting or welding. The bridge reinforcing structure according to claim 1 or 2,
When one end of the main girder in the longitudinal direction is supported on the abutment,
Of the pair of suspending members, the suspending member on the abutment side is a bridge reinforcement structure that is connected to the abutment by a falling bridge prevention member. The bridge reinforcing structure according to claim 3,
Connecting the abutment member on the abutment side and the abutment by the two falling bridge prevention members,
In the hanging member on the abutment side, a bridge reinforcing structure in which the tension member is fixed between the two fallen bridge prevention members and the fixing position. The bridge reinforcing structure according to claim 3,
The pair of hanging members are connected by the two tension members,
In the hanging member on the abutment side, a bridge reinforcing structure in which the falling bridge prevention member is fixed between the two tension members and a fixing position where the two tension members are fixed. A bridge reinforcing structure for reinforcing a bridge in which one end portion in the longitudinal direction of the first main girder and the other end portion in the longitudinal direction of the second main girder are supported on a bridge pier,
For each of the main girders, a pair of suspended members that are separated from each other in the longitudinal direction of the main girders and are suspended from the lower surface of the main girders and coupled to the main girders, and tension between the pair of suspended members A tension member that provides force,
Of the pair of suspended members provided on the first main girder, the first suspended member on the one end side and the pair of suspended members provided on the second main girder A bridge reinforcement structure, characterized in that a second hanging member on the other end side is connected by a falling bridge prevention member. The bridge reinforcing structure according to claim 6,
The first hanging member and the second hanging member are connected by the two falling bridge prevention members,
In each of the first suspending member and the second suspending member, a bridge reinforcing structure in which the falling bridge prevention member is fixed between the two falling bridge prevention members and a fixing position to be fixed. The bridge reinforcing structure according to claim 6,
Connecting the pair of hanging members provided on the first main girder by the two tension members;
Connecting the pair of hanging members provided on the second main girder by the two tension members;
In each of the first suspending member and the second suspending member, a bridge reinforcing structure in which the falling bridge prevention member is fixed between the two tension members and a fixing position where the two tension members are fixed. Connecting a pair of suspending members to the main girder while being suspended from the lower surface of the main girder while being spaced apart from each other in the longitudinal direction of the main girder of the bridge;
Fixing one end of the tension member to one of the pair of hanging members and fixing the other end of the tension member to the other of the pair of hanging members; A method of reinforcing a bridge, comprising a step of applying tension between the two.

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