JP2008057284A - Anticorrosive cut-off material for steel expansion joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an anticorrosive cut-off material for a steel expansion joint which demonstrates the cut-off performance when rainwater enters through an expansion gap of the steel expansion joint, and prevents corrosion in an end surface of a web plate inside the steel expansion joint and a lower surface of a face plate. <P>SOLUTION: The anticorrosive cut-off material for the steel expansion joint is provided in a manner of being fixed to each of both end surfaces of the expansion gap of a pair of facing web plates of the steel expansion joint having the pair of web plates and a pair of facing face plates. The anticorrosive cut-off material for the steel expansion joint comprises a cut-off material main body and a pair of anticorrosive thin metal plates having an L-letter shape in cross section. The cut-off material body comprises a supporting layer which is expansible following the expansion of the whole expansion gap, a cut-off layer fixed to and integrated with an upper surface of the supporting layer, and a protection layer fixed to and integrated with an upper surface of the cut-off layer. The pair of anticorrosive thin metal plates are arranged from side faces to a part of an upper surface of the cut-off material body, respectively, at an interval, and are fixed to the side faces of the cut-off material body, respectively. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention is a steel for preventing the fall of rainwater and the like from the gap between the steel expansion joints used in bridges and buildings, etc., and preventing the corrosion of the web plate end face and the face plate lower surface inside the steel expansion joint. The present invention relates to a corrosion-resistant waterproofing material for expansion joints made of steel.

  Many bridges and the like are provided with steel expansion joints at regular intervals because expansion and contraction due to temperature changes occur. The steel expansion joint has a pair of opposed web plates and a pair of opposed face plates. Each web plate is supported vertically on the opposite bridge girder at a distance. The face plates are horizontally fixed to the upper end of the web plate with a gap between each other. Then, it is necessary to prevent the rainwater from leaking and falling from the gap between the steel expansion joints to corrode the end portion of the bridge girder and the bridge girder support portion.

  For this reason, in Patent Document 1 (Japanese Patent No. 2689079), a waterproofing material for a steel expansion joint that closes a gap (joint) between opposing web plates is attached and waterproofed.

  In FIG. 2, the perspective view explaining the water stop material for this steel expansion joint is shown, and the state arrange | positioned to the steel expansion joint is shown. The steel waterproof joint 11 for expansion joint is provided between the web plates 2a and 2b of the steel expansion joint 4 having a pair of web plates 2a and 2b and a pair of face plates 3a and 3b.

  The steel waterproofing material 11 for an expansion joint is formed by stacking an upper protective layer 5, a middle water-stopping layer 6 and a lower supporting layer 7 in order and bonding them together, and the supporting layer 7 is a pair of vertically long And a pair of web plates 2a directly or through other members on the outer side surfaces of the closed cell foam part and an open / closed part made of open cell foam fixed and integrated between the closed cell foam parts. , 2b are attached to the end face. Therefore, in this water-stopping material 1 for steel expansion joints, the displacement between the opposing web plates 2a and 2b is absorbed mainly by the volume change of the expansion and contraction portion of the support layer 7, and the water-stopping layer 6 and the closed cells are also absorbed. Water resistance is obtained by the foam portion to prevent the rainwater and the like from dropping from the gap between the steel expansion joints.

  Further, Patent Document 2 (Japanese Patent Laid-Open No. 2002-155581) and Patent Document 3 (Japanese Patent Laid-Open No. 2006-29069) attempt to further improve the invention according to Patent Document 1. In Patent Document 2, a device in which the stretchable portion of the support layer hardly bends in the vertical direction is devised. In Patent Document 3, even when the protective layer is impregnated with water and frozen, the volume can be easily changed to form a protective layer. A device has been devised that allows expansion and contraction of the play without cracking or breaking.

Japanese Patent No. 2689079 JP 2002-155581 A JP 2006-29069 A

  However, in the water-stopping material for steel expansion joints of Patent Documents 1 to 3, when rainwater flows in from the gap between the steel expansion joints, the protective layer is impregnated with water, or the adhesive surface between the support layer and the end face of the web plate On roads where water is in the vicinity of water or sprayed with anti-freezing material, salt-containing water comes into contact with it, so there is a problem that the end surface of the web plate and the lower surface of the face plate tend to get wet and corrode. It was. And if corrosion progresses and the steel plate thickness decreases, there is a risk that it will be damaged by traffic load etc. and the entire steel expansion joint will have to be replaced, and the maintenance cost of bridges etc. may increase. .

  Accordingly, an object of the present invention is to solve the above-described problems, and when rainwater flows in from the gap between the steel expansion joints, it exhibits water-stopping properties. An object of the present invention is to provide a waterproof water-proof material for steel expansion joints that can prevent corrosion of the lower surface of the face plate.

  As a result of the study, the inventors have arranged a pair of L-shaped anticorrosion thin metal plates in addition to the waterstop main body, and each of the pair of anticorrosion thin metal plates is provided on the waterstop main body. The inventors have found that the above object can be achieved by arranging the respective side surfaces apart from a part of the upper surface, and have reached the present invention.

That is, the present invention relates to a steel expansion joint anticorrosive property provided by being fixed to both end surfaces of a free space of a facing web plate of a steel expansion joint having a pair of facing web plates and a pair of facing face plates. A waterstop material,
It consists of a waterproofing material body and a pair of cross-sectional shape L-shaped anticorrosion thin metal plates,
The water-stop material body includes a support layer that can be expanded and contracted according to the expansion and contraction of the entire gap, a water-stop layer that is fixed and integrated on the upper surface of the support layer, and a protection that is fixed and integrated on the upper surface of the water-stop layer. And having a layer
The pair of anticorrosive thin metal plates are respectively arranged to be spaced apart from each side surface of the water-stopping material main body to a part of the upper surface, and fixed to each side surface of the water-stopping material main body. The present invention provides a corrosion-resistant waterproofing material for steel expansion joints.

  In the corrosion-resistant waterproofing material for steel expansion joints according to the present invention, the corrosion-resistant thin metal plate is fixed to all or a part of the side surface of the waterproofing material main body.

  In the corrosion-resistant waterstop for steel expansion joints according to the present invention, the corrosion-resistant thin metal plate is preferably made of zinc, aluminum, magnesium, or an alloy thereof.

  The anti-corrosion water-proof material for steel expansion joints according to the present invention is a thin metal plate having anti-corrosion properties while only the water-stop material body can follow the expansion and contraction of the web plate due to expansion and contraction. By adhering to the end surface of the web plate and coming into contact with the lower surface of the face plate, the anticorrosive action by the thin metal plate can be extracted, and corrosion prevention can be achieved.

  For this reason, the corrosion-resistant water-proof material for steel expansion joints according to the present invention can exhibit water-stopping properties and can prevent corrosion of the web plate end face and the face plate lower surface inside the steel expansion joint.

Hereinafter, the best mode for carrying out the present invention will be described in detail.
FIG. 1 is a perspective view showing an embodiment of a corrosion-resistant water-proof material for steel expansion joints according to the present invention, and shows a state in which the steel expansion joints are arranged.

  In FIG. 1, a corrosion-resistant waterproofing material 1 for steel expansion joints is fixedly provided on both end surfaces of the free web plates 2 a and 2 b of a steel expansion joint 4. The steel expansion joint 4 has a pair of opposed web plates 2a and 2b and a pair of opposed face plates 3a and 3b.

  The corrosion-resistant waterproofing material 1 for steel expansion joints according to the present invention comprises a waterproofing material body and a pair of corrosion-resistant thin metal plates 8a and 8b having a L-shaped cross section.

  The water-stop material main body is fixed and integrated to the upper surface of the water-stopping layer, the support layer 7 that can be expanded and contracted according to the expansion and contraction of the entire gap, the water-stop layer 6 that is fixed and integrated to the upper surface of the support layer, And a protective layer 5.

  Although the material, shape, and the like of the protective layer 5, the waterstop layer 6, and the support layer 7 are arbitrary, for example, the materials described in Patent Document 1 are used.

  That is, the protective layer 5 is made of open cell foam, and the water blocking layer 6 is made of a low elastic rubber sheet. The support layer 7 is composed of an expandable and expandable open cell foam and a pair of closed cell foam layers located on both side surfaces thereof. The protective layer 5 may be partly or entirely a closed / continuous mixed cell foam layer in which closed cells and open cells are mixed.

  The pair of anticorrosive thin metal plates 8a and 8b are respectively arranged to be spaced apart from each side surface of the water-stopping material body to a part of the upper surface, and are fixed to each side surface of the water-stopping material body. In FIG. 1, the anticorrosion thin metal plates 8 a and 8 b are fixed to a part of the side surface of the water blocking material main body, but may be fixed to the entire side surface. The anticorrosive thin metal plates 8a and 8b are preferably made of zinc, aluminum, magnesium or an alloy thereof having a sacrificial anodic action.

  In FIG. 1, the anticorrosion thin metal plates 8a and 8b are fixed to the end surfaces of the web plates 2a and 2b and are in contact with all the lower surfaces of the face plates 3a and 3b. You may contact | abut to a part.

  In the present invention, the pair of anticorrosive thin metal plates 8a and 8b are disposed apart from each side surface of the water-stopping material main body to a part of the upper surface, so that corrosion of the web plate end surface and the face plate lower surface is prevented. Can be prevented. Further, since the anticorrosion thin metal plates 8a and 8b are fixed on the respective side surfaces of the water-stopping material main body, only the water-stopping material main body expands and contracts with respect to expansion and contraction between the web plates 2a and 2b.

  The corrosion-resistant water-proof material for steel expansion joints according to the present invention exhibits water-stopping properties and can prevent corrosion of the web plate end face and the face plate lower surface inside the steel expansion joint. Therefore, this invention is used suitably as a water stop material of the steel expansion joint used for a bridge, a building, etc.

FIG. 1 is a perspective view showing an embodiment of a corrosion-resistant water-proof material for steel expansion joints according to the present invention. FIG. 2 is a perspective view for explaining a conventional water-stopping material for steel expansion joints.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,11: Water stop material 2a, 2b for steel expansion joints: Web plate 3a, 3b: Face plate 4: Steel expansion joint 5: Protective layer 6: Water stop layer 7: Support layers 8a, 8b: Thin anticorrosion Metal plate

Claims (3)

A steel anti-corrosion waterproofing material for a steel expansion joint provided by being fixed to both end surfaces of a free space of the opposing web plate of a steel expansion joint having a pair of opposing web plates and a pair of opposing face plates. ,
It consists of a waterproofing material body and a pair of cross-sectional shape L-shaped anticorrosion thin metal plates,
The water-stop material body includes a support layer that can be expanded and contracted according to the expansion and contraction of the entire gap, a water-stop layer that is fixed and integrated on the upper surface of the support layer, and a protection that is fixed and integrated on the upper surface of the water-stop layer. And having a layer
The pair of anticorrosive thin metal plates are respectively arranged to be spaced apart from each side surface of the water-stopping material main body to a part of the upper surface, and fixed to each side surface of the water-stopping material main body. Anti-corrosion waterproofing material for steel expansion joints. The corrosion-resistant water-proof material for steel expansion joints according to claim 1, wherein the corrosion-resistant thin metal plate is fixed to all or a part of a side surface of the water-proof material main body. The said corrosion-resistant thin metal plate consists of zinc, aluminum, magnesium, or those alloys, The corrosion-resistant waterproofing material for steel expansion joints of Claim 1 or 2.

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