JP2008069596A - Method of repairing leakage at expansion device of bridge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of repairing a leakage point, which is applicable to an expansion device having a small expansion gap width without a hitch. <P>SOLUTION: According to the method, a tube-type water cutoff member 7 which has a swellable water cutoff rubber 9 layer outside a resin tube 8 having properties of restoring to a hollow shape, is provided, and by releasing internal air, the tube-type water cutoff member 7 is flattened. Then the tube-type water cutoff member 7 in this flattened state is inserted into a girder expansion gap 1, and thereafter the swellable water cutoff rubber 9 is pressed to end faces Sa, Sb of respective girders 2a, 2b by virtue of restoring force of the tube 8, followed by sticking the tube-type water cutoff member 7 and the end faces Sa, Sb of the girders 2a, 2b, to each other over the entire widthwise area of a bridge. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for repairing a water leak location in a telescopic device (joint) attached to a girder gap portion of a bridge (a road bridge, a railway bridge, etc.), and particularly, even when the gap width is small. The present invention relates to a water leakage repair method that can be applied without any problems.

  In general expansion and contraction devices that are installed in bridge girder gaps, water is stopped on the lower surface side, and rainwater etc. does not flow down to the underside of the girder or under the support. .

  However, the water stop function is impaired due to structural defects or aging, and water leakage may occur. When water leaks, deterioration of bearings, bridge ends, piers, abutments, etc. may progress. In particular, road surface anti-icing agent may be sprayed in winter, but if there is a water leak, chloride of road surface anti-icing agent will flow down with rainwater and penetrate into the concrete and corrode steel bars and steel frames. Sometimes. Moreover, there is a possibility that the concrete will be damaged due to freezing of water that has penetrated into the concrete.

  Therefore, it is necessary for the bridge manager to perform regular maintenance so that water leakage does not occur in the expansion / contraction device. When a water leakage location is found, it is necessary to perform repair work immediately.

  By the way, there are various types and various sizes of expansion and contraction devices for bridges, and they are appropriately selected and used according to the characteristics of the bridge and the size of the girders to be applied. Among them, in the expansion and contraction device used when the gap width is small (10 cm or less), it is often difficult to perform the above water leakage repair work. This is because it may be difficult for the worker to approach or the worker may not be able to insert his / her hand.

  The present invention has been made to solve such a problem of the prior art, and an object of the present invention is to provide a water leakage repair method that can be applied to a telescopic device having a small gap width without problems. .

  The water leakage repair method according to the present invention provides a tube-type water-stopping material having a swellable water-proof rubber layer on the outside of a resin tube having a property of restoring a hollow shape, and vents the air inside the tube. With the mold water-stopping material in a flat state, the tube-type water-stopping material is inserted into the space between the girders, and then the swelling water-stopping rubber is pressed against the end face of the spar by the restoring force of the tube. It is characterized in that the material and the end face of the girder are brought into close contact over the entire width direction of the bridge.

  After inserting the tube-type water stop material into the girder gap, pressurize the air and positively inflate the tube so that the swelling water-proof rubber is pressed against the end face of the beam. The water stop material and the end face of the beam can be adhered more strongly. In addition, an expansible sealing material may be applied to the joint between the girder and the tube-type water-stopping material. In this case, the water-stopping effect can be further improved and the durability can be greatly improved. .

  In addition, it is preferable that a support material for supporting the tube-type water-stopping material is disposed in advance in the girder gap portion before the tube-type water-stop material is inserted. It can also be used as an insertion guide. Moreover, when the foreign material exists in the girder gap part, in order to improve water-stopping property, it is preferable to remove them beforehand.

  In addition, the tube-type water-stopping material for repairing water leakage according to the present invention has a swellable water-proof rubber layer on the outside of a resin tube having the property of restoring a hollow shape, and has a valve at at least one end. In addition, it is characterized in that it can be made flat by extracting air from the inside of the tube and can be maintained inflated by press-fitting air into the tube.

  The water leakage repair method according to the present invention can be applied without problems to a girder gap portion having a small gap width (for example, 10 cm or less). Moreover, according to the water leak repair method which concerns on this invention, it is not necessary to replace the existing expansion-contraction apparatus, and since it can leave as it is, construction cost can be restrained low.

  In addition, since all work can be performed under the road surface, the work can be performed safely and traffic regulation on the road surface is not required and can be performed without being restricted by time.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the accompanying drawings. 1-4 is explanatory drawing of the water leak repair method which concerns on the 1st Embodiment of this invention, Among these, FIG.1 and FIG.3 is the girder gap part 1 of the bridge (road bridge) used as application object. FIG. 2 and FIG. 4 are side views of the girder gap portion 1. In these figures, 2a and 2b are girders, 3 is a telescopic device, and 4a and 4b are road surfaces.

  When the gap width is small (for example, 10 cm or less), the girder gap portion 1 may contain impurities 10 such as expanded polystyrene or urethane foam. When carrying out the water leakage repairing method of the present embodiment, if such impurities 10 are present in the girder gap portion 1, they are first removed, and the end faces Sa, Sb of the opposing girders 2a, 2b are removed. Expose.

  The removal of the contaminants 10 is performed by the following method, for example. First, a cone (or a drill) is pierced from the side of the bridge at an arbitrary height position in the crossing direction of the bridge (the position and direction of the reference line D indicated by the alternate long and short dash line in FIG. 1). A through-hole 11 is formed at the center of the. Then, a wire-like material having a large number of barbs or nails, such as a barbed wire, is inserted into the through-hole 11, and this is reciprocated in small increments in the longitudinal direction to crush the contaminants 10. Go. Finally, scrapes attached to the end surfaces Sa and Sb of the girders 2a and 2b are scooped off and finished with a long file material or a metal brush.

  Next, as shown in FIG. 3 and FIG. 4, a support member 5 for supporting the water stop means is inserted into the girder gap 1. As the support member 5, for example, a reinforcing bar having a diameter of about 10 mm and a length approximately the same as the width dimension of the beam 2 can be used. The inserted support member 5 is engaged with holders 6 and 6 that are fixed to the left and right side surfaces of the girders 2a and 2b in advance. To hold.

  Subsequently, a tube-type water blocking material 7 as shown in FIG. 5 is inserted into the space between the support member 5 and the expansion / contraction device 3 from the side of the girder gap portion 1. This tube-type water-stopping material 7 has a layer of swellable water-stopping rubber 9 and 9 on the outside of a resin-made tube 8 having appropriate elasticity and rigidity (a belt-like shape is formed on the outer peripheral surface of the tube 8). Two swellable water-stopping rubbers 9, 9 are attached). The resin tube 8 used here is normally stable in a state where the cross section is circular as shown in FIG. 5 (1) (hollow shape), and deforms when an external force is applied. When the applied force is released, it has a property (restoring force) that immediately returns to the original state (hollow shape).

  The tube-type water blocking material 7 has an outer diameter dimension W (a dimension in the case where the tube 8 is in a normal state, rather than the clearance width of the girder gap portion 1 to be inserted. A thing with a large dimension (from the side surface to the outer surface of the water blocking rubber 9 on the opposite side) is used. The length is about the same as the width dimension of the beam 2.

  In addition, the both ends of the tube-type water blocking material 7 are closed, and a valve is attached to one end. Then, by connecting a vacuum pump to this valve and extracting the air in the tube, as shown in FIG. 5 (2), it can be flatly deformed in a belt shape (flat state) and the cross-sectional area can be reduced. It has become.

  The tube-type water blocking material 7 is inserted into the girder gap portion 1 (the space between the support member 5 and the expansion / contraction device 3) as shown in FIG. 5B (a flat state with a reduced cross-sectional area). ) When the valve is opened after insertion, the tube-type water blocking material 7 tries to return from the state of FIG. 5 (2) to the normal state as shown in FIG. 5 (1) by the restoring force of the tube 8. The tube type water blocking material 7 used in the above has a larger outer diameter dimension W than the gap width of the inserted girder gap portion 1, so that the swellable water blocking rubber 9 attached to the outer peripheral surface of the tube 8 is used. 9 are pressed against the end surfaces Sa and Sb of the girders 2a and 2b by the tube 8, respectively. As a result, as shown in FIG. 6, the tube-type waterstop 7 and the end surfaces Sa and 2b of the girders 2a and 2b Sb is in close contact with the entire width direction of the bridge, and a sufficient water stop effect can be obtained in the girder gap portion 1.

  In addition, after inserting the tube-type water blocking material 7 into the girder gap 1, not only the valve of the tube 8 is opened, but also a pressure pump is connected to the valve, and air is pressed into the tube 8 to You may make it inflate positively. In this case, the swellable waterproof rubbers 9 and 9 attached to the outer peripheral surface of the tube 8 are more strongly pressed against the end surfaces Sa and Sb of the girders 2a and 2b. Even if there are some irregularities on the end surfaces Sa and Sb, the tube-type water blocking material 7 and the end surfaces Sa and Sb of the girders 2a and 2b can be completely adhered over the entire width direction of the bridge. A higher water stop effect can be obtained.

  Furthermore, a predetermined amount of curing agent is added to and mixed with an expansible sealing material (for example, a urethane-based liquid or paste-like main agent) at the joint between the girders 2a and 2b and the tube-type water-stopping material 7. , Gradually foaming, expanding and curing over several hours, and after curing, a sealing material that exhibits a high water-stopping effect due to water-absorbing swellability may be applied. In this case, the water-stopping effect is further improved. In addition, the durability can be greatly improved. In addition, application | coating of an expansible sealing material can be performed by the following methods, for example.

  First, an end of the lead wire inserted in advance in the girder gap 1 (above the tube-type water-stopping material 7) in advance is a sufficiently long belt-like material having high water permeability and appropriate flexibility ( For example, the band-shaped material is slowly introduced into the beam gap portion 1 by being tied to one end of a gauze or the like and pulling the opposite end of the lead wire. At this time, the inflatable sealing material that has been adjusted to a loose paste is uniformly dropped on the belt-like material. In this way, the band-shaped material applied to the paste-like inflatable sealing material is introduced into the girder gap portion 1 (around the joint portion between the girders 2a and 2b and the tube-type waterstop material 7), thereby providing a seal. The material can be easily applied.

It is explanatory drawing of the water leak repair method which concerns on the 1st Embodiment of this invention, Comprising: The partially notched perspective view which shows an example of the girder gap part 1 of the bridge (road bridge) used as application object. The side view of the beam gap part 1 of FIG. FIG. 2 is a partially cutaway perspective view of the girder gap portion 1 of FIG. The side view of the beam gap part 1 (state which attached the supporting material 5) of FIG. The cross-sectional perspective view of the tube-type waterstop material 7 used in the 1st Embodiment of this invention. FIG. 2 is a side view of the girder gap portion 1 (in a state where a tube-type water blocking material 7 is inserted) of FIG.

Explanation of symbols

1: Girder interval,
2a, 2b: digits,
3: telescopic device,
4a, 4b: road surface,
5: Support material,
6: Holder,
7: Tube-type waterstop material,
8: Tube
9: Swellable waterproofing rubber,
10: Contamination,
11: Through hole

Claims (6)

Prepare a tube-type water-stopping material having a swellable water-proof rubber layer on the outside of a resin tube having the property of restoring a hollow shape,
The tube-type water-stopping material is made flat by removing the air inside, and in that state, the tube-type water-stopping material is inserted into the gap between the gaps,
Thereafter, the swelling water-stopping rubber is pressed against the end face of the spar by the restoring force of the tube, and the tube-type water-stopping material and the end face of the spar are brought into close contact with each other. Prepare a tube-type water stop material having a swellable water stop rubber layer on the outside of the resin tube,
The tube-type water-stopping material is made flat by removing the air inside, and in that state, the tube-type water-stopping material is inserted into the gap between the gaps,
Then, the water leakage repair method in the bridge expansion-contraction apparatus characterized by pressing the said swelling water stop rubber against the end surface of a girder by injecting air and positively inflating the said tube.   The method for repairing water leakage in a bridge expansion / contraction device according to claim 1, wherein an expandable sealing material is applied to a joint portion between the beam and the tube-type waterstop material.   Prior to the insertion of the tube-type water-stopping material, a support material for supporting the tube-type water-stopping material is arranged in advance in the girder gap portion. For leaking water in a bridge telescopic device.   The method for repairing water leakage in a bridge expansion and contraction device according to any one of claims 1 to 4, wherein impurities existing in the gap portion are removed in advance. While having a swellable waterproof rubber layer on the outside of the resin tube having the property of restoring to a hollow shape, it has a valve at least at one end,
A tube-type water-stopping material for repairing water leakage that can be flattened by extracting air from the inside of the tube and can be maintained inflated by press-fitting air into the inside.

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