JP5294672B2 - Method for joining bridges - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for joining a viaduct having a high waterproof performance and can flexibly correspond to an enlargement and reduction of a space part in accordance with expansion and contraction of the viaduct by temperature difference and a waterproofing layer is not easily deteriorated by protecting the waterproofing layer from damage factor. <P>SOLUTION: A buffer member 25 is arranged inside of a space part 3 formed between a bridge 1 and 1' adjacent to each other, a waterproofing layer 36 having flexibility by spraying elastomer is formed so as to cover a whole of the top face of the buffer member 25 and at least one part of the top face of the bridge adjacent along the space part, and a protective layer 40 is formed so as to cover the waterproofing layer 36 and at least one part of the top face of the bridge 1 and 1' adjacent along both sides of the waterproofing layer 36. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a method for joining bridges such as viaducts and river bridges. In particular, the present invention relates to a joining method that can more reliably prevent water from entering a space provided between adjacent bridges and can flexibly cope with expansion / contraction of the space between bridges. .

  In the railway business, as roads and the transportation network of railways develop and traffic volume increases, road congestion due to railroad crossings is reduced, the impact of train noise on the surroundings is reduced, and land In order to make effective use, the use of the elevated railway system or the switching to the elevated railway system is increasing. If the elevated railway system is adopted, it can be effectively used as a space for stations, stores, other buildings, parking lots, bicycle parking lots, etc. under the viaduct.

  Bridges such as viaducts have many reinforced concrete piers arranged on the ground, and floor slabs and wall rails on the piers. Generally, the distance between bridge piers is about 6 to about 10 m, the width of the bridge is about 11 m, the length is about 30 m to about 50 m, and the height of the wall height column (rise portion) of the bridge is about 2 m. Bridges are generally formed using reinforced concrete or prestressed concrete. In the viaduct, a ballast track or a slab track is generally used. The ballast track is constructed by building a ballast made of ballast on the horizontal part of the bridge, and laying a rail that fixes the rail to the sleeper via a rail fastening device. In the slab track, a concrete slab is installed on a horizontal part of a bridge via a mortar, and the rail is fixed to the concrete slab by a rail fastening device.

  In both cases of ballast track and slab track, between the bridges that are viaduct structures, joints (hereinafter referred to as space parts) are formed at regular intervals in the extension direction in order to absorb the expansion and contraction of the structure due to temperature differences. Is provided). This space part needs to be joined by some method in order to prevent ballast drop and waterproof.

The following is a conventional technique for joining the space portions.
Currently, there is a method using a steel plate as a method generally used for viaduct. This method is a method in which a buffering member is disposed in a space between adjacent bridges, and a steel plate is laid on the upper surface of the bridge including the upper portion of the member.

  Patent Literature 1 discloses a joint material for filling a space formed between viaduct bridges to prevent water leakage. This joint material has a solid rubber fin portion that covers both end surfaces of adjacent bridges and the space portion, and a solid rubber leg portion that hangs downward from the fin portion. The joint material further has a fitting body made of rubber or foam having a hollow portion and a vertical slit in a space formed by the fin portion and the leg portion. In use, the leg portion is inserted into the space through the epoxy resin.

  Patent Document 2 discloses a method for stopping water at a joint portion between bridges formed in parallel to each other on an automobile road such as an expressway or a general road with a large amount of traffic. In this method, an elastic seal member is disposed so as to cover the joint portion of the center separation band between the upper and lower lines constituted by the balustrade portion on the side edge portion of the bridge, and an elastomer layer is formed so as to cover the elastic seal member. It is a method of stopping water between bridges by fixing.

Japanese Utility Model Application No. 5-38005 Japanese Patent Publication No. 7-18132

  In particular, when joining bridge spaces in cold regions such as Hokkaido, it is necessary not only to prevent water leakage and ballast drop, but also to reliably prevent freezing and occurrence of icicles due to water intrusion. This is because there is a risk that the bridge and the buffer member will deteriorate prematurely due to the freezing and thawing action of the water that has entered the space, and if water enters the space, the water will freeze and become trapped under the bridge. This is because, for example, when an underpass business is carried out, there is a possibility that the business will be seriously hindered. Therefore, the joint method of the space part in the bridge in the cold district has higher waterproof performance in the joint portion without reducing the stretchability and workability of the joint portion compared to the joint method of the space part used outside the cold district. It must be something that can be granted. Furthermore, it is necessary to protect joints on bridges such as railroads because workers for track maintenance work and temporary placement of materials and equipment are performed.

  From this viewpoint, the following problems exist in the conventional technology. The method of laying a steel plate merely covers the space with a steel plate so that gravel or the like does not fall from the space, and waterproofness is not considered at all. Moreover, although the technique of patent document 1 is related with the joint material for preventing water leak, in this technique, the high waterproof performance calculated | required in a cold region cannot be obtained in many cases. Furthermore, since the technique of patent document 2 is a technique used in the part where a person's passage and a track maintenance work are not performed, the countermeasure with respect to damage etc. of a waterproof layer is not considered at all.

  The present invention has a high waterproof performance that exceeds the conventional joining method, can flexibly cope with expansion and contraction of the space due to the expansion and contraction of the bridge due to temperature difference, and the waterproof layer from the cause of damage due to track maintenance work, ultraviolet rays, etc. It is an object of the present invention to provide a joining method in which a waterproof layer having high elasticity is hardly deteriorated by preventing.

  The first aspect of the present invention includes a step of disposing a buffer member in a space formed between adjacent bridges, and at least the entire upper surface of the disposed buffer member and the upper surface of the bridge adjacent to the space. Forming a waterproof layer having elasticity so as to cover a part, and covering at least a part of the waterproof layer and a part of the upper surface of the bridge adjacent to both sides of at least a part of the waterproof layer Thus, the method of joining the space part of a bridge including the process of forming a protective layer. The waterproof layer can be formed by spraying an elastomer. The elastomer is preferably a two-component urethane resin.

  As the buffer member, one having an upper width wider than the lower width, for example, a cross-sectional shape formed into a shape such as a substantially T shape, a substantially inverted triangle, or a substantially inverted trapezoid can be used. . In this case, in order for the buffer member to be accommodated in the space portion, the bridge is formed such that the distance between the upper portions of the opposing end surfaces of the adjacent bridges is wider than the distance between the lower portions. The buffer member further has a width narrower than the width between the upper wall portion of the cross-sectional bellows extending in parallel with the space portion, the side wall portions formed on both sides of the upper wall portion, and at least the outer end of the lower end of the side wall portion. And a lower structure extending downward from the lower ends of the side wall portions so as to connect the side wall portions, and a hollow portion extending along the space portion surrounded by the upper wall portion, the side wall portions, and the lower structure body. What has can also be used.

  The step of forming the waterproof layer can include at least a step of disposing an insulating material on the buffer member and a step of forming a waterproof layer having elasticity on the insulating material. The portion of the waterproof layer that is not covered by the protective layer is preferably covered with a protective film for protecting the waterproof layer from ultraviolet rays.

  The protective layer is preferably formed of concrete or mortar from the viewpoint of cost. In this case, the protective layer is provided with a gap penetrating the thickness of the protective layer above the space portion along the space portion for the purpose of absorbing expansion and contraction of the protective layer. In order to further increase the strength, the protective layer preferably includes a reinforcing member, and the reinforcing member is a wire mesh or a reinforcing bar, and is disposed in the protective layer so as to extend at least in a plane parallel to the upper surface of the bridge. preferable.

  According to a second aspect of the present invention, there is provided an upper wall portion having a cross-sectional bellows shape extending in parallel with a space portion formed between adjacent bridges, side wall portions formed on both sides of the upper wall portion, and at least the side wall portions. Surrounded by a lower structure, an upper wall part, a side wall part, and a lower structure that have a width narrower than the width between outer ends of the lower ends and extend downward from the lower end of the side wall parts so as to connect the side wall parts. A cushioning member disposed in a space formed between adjacent bridges in a method for joining adjacent bridges to each other, characterized by having a hollow portion extending along the space portion .

  According to the present invention, a cushioning member is disposed in a space formed between adjacent bridges, and an elastomer is sprayed so as to cover the upper surface and a part of the bridge to form a highly stretchable waterproof layer. Thus, as compared with the prior art, a reliable waterproof performance can be obtained while improving the capacity to cope with the expansion and contraction of the space due to the expansion and contraction of the bridge. By adopting elastomer spraying technology to form the waterproof layer, spaces that exist in parts with complex shapes, such as parts that have ducts, parts that stand up in the vertical direction, or spaces that exist in other three-dimensional structures The waterproof layer can be reliably and easily formed on the portion. By forming the waterproof layer in this way, it is possible to reliably prevent the occurrence of freezing and icicles due to the ingress of water into the space, so that the repair frequency of the bridge can be greatly reduced and effective use has progressed in recent years. Contributes to the prevention of danger under the overpass. Preferably, by using a two-pack type urethane resin having a high curing speed as the elastomer, a waterproof layer having high stretchability and waterproofness can be formed more quickly and reliably.

  In addition, by placing an insulating material such as craft tape with low adhesion to the elastomer on the cushioning member placed in the space, the space can be expanded or contracted even if the waterproof layer is firmly bonded to the upper surface of the bridge. The ability to respond to is not reduced.

  In addition, the bridge is made so that the width of the upper part of the opposite end face of the bridge is wider than the width of the lower part, and the buffer member whose cross-sectional shape is formed to match the shape of the resulting space part By disposing in this way, it is possible to prevent the buffer member from shifting and sinking after the buffer member is disposed. By configuring in this way, the repair frequency can be reduced in a portion that is difficult to repair, so that the method according to the present invention contributes to cost reduction. Furthermore, by using a buffer member in which at least the inside of the upper part is hollow and the upper wall is formed in a cross-sectional bellows shape, it is possible to more effectively cope with the expansion and contraction of the space portion, and the workability is improved.

  Furthermore, by covering the waterproof layer with a protective layer, the waterproof layer is protected from damage caused by ballast scatter, passage of track maintenance workers, temporary placement of equipment, etc. Can be protected from deterioration due to ultraviolet rays. About the part in which a protective layer is not formed, a waterproof layer can be protected from deterioration by an ultraviolet-ray similarly to a protective layer by coat | covering a waterproof layer with a protective film. The material of the protective layer is not particularly limited, but when the protective layer is formed of concrete or mortar, a gap that penetrates from the upper surface to the lower surface of the protective layer is provided along the space to absorb the expansion and contraction of the protective layer. can do. By including a reinforcing member in the protective layer, the strength of the protective layer can be improved, and cracking and peeling of the protective layer can be prevented. The strength of the protective layer can be further improved by arranging the reinforcing member of the wire mesh or the reinforcing bar in the protective layer substantially parallel to the upper surface of the bridge.

An embodiment of the present invention will be described in detail with reference to FIGS.
As shown in FIG. 1, the method of the present invention includes joints or spaces 3 provided between floor slabs (horizontal portions) 1 and 1 ′ of adjacent bridges of a viaduct 10 on which a track 5 is laid, and This is a technique for joining joints, that is, spaces 4 provided between wall height columns (rising portions) 2 and 2 ′ of adjacent bridges. These space portions 3 and 4 are provided at regular intervals for the purpose of absorbing expansion and contraction due to the temperature difference between the floor slabs 1 and 1 'and the wall height columns 2 and 2'. In FIG. 1, the space portion 3 is provided in a direction transverse to the extending direction of the viaduct 10, but may be provided in a direction parallel to the extending direction. Therefore, in this specification, the term “adjacent bridge” includes not only a floor slab (or wall rail) adjacent to the direction of extension of the viaduct, but also a floor slab (or wall rail) adjacent to the direction intersecting with the extension direction. . The width of the spaces 3 and 4 (that is, the distance between adjacent bridges) is about 30 mm to about 50 mm. On the floor slabs 1 and 1 ', in the case of a ballast track, a road bed is constructed, and a rail having rails extending in the extension direction of the bridge is constructed thereon. In the case of a slab track, a concrete slab is installed, and a rail that extends in the extension direction of the bridge is fixed thereon.

  The space between these structures is not provided only between viaduct bridges, but is also provided between girders and girders in girder-type bridges such as river bridges, or between girders and abutments. May be. Therefore, the joining method according to the present invention can be applied not only to a viaduct space part described in detail below, but also to a space part in a river bridge, for example.

  FIG. 2 is a view of the floor slabs 1, 1 ′ including the space portion 3 as viewed from the direction of the arrow A in FIG. 1. In addition, in the following description, although the process of joining the space part 3 between the floor slabs 1 and 1 'is demonstrated, as mentioned above, these processes are the space part 4 between the wall height column 2 and 2'. The same applies when joining, or when joining between girders and girders or between girders and abutments in girder-type bridges such as river bridges.

  In an embodiment of the present invention, first, at least part of the end surfaces 11 and 11 ′ of the floor slabs 1 and 1 ′, that is, the entire range in which the buffer member 25 is arranged, or at least a part thereof, is smoothed. Then, it is preferable to apply the base treatment material 21 for improving the adhesion with the buffer member 25. As the base material 21, for example, an epoxy resin known to those skilled in the art can be used. Next, an adhesive 22 known to those skilled in the art, such as an epoxy adhesive, is applied on the base treatment material 21.

  Next, in the space 3 between the floor slabs 1, 1 ′, at least the upper part of the space 3 is sealed, and a buffer member 25 that functions as a buffer material for absorbing expansion and contraction of the floor slabs 1, 1 ′ is disposed. To do. In one embodiment of the present invention, the buffer member 25 has a rectangular cross section shown in FIG. 2, and has a width substantially the same as the width of the space portion 3 between the floor slabs 1, 1 ′. The buffer member 25 may be formed as a long buffer member having the same length as the space 3 or may be formed as a plurality of buffer members 25 divided into appropriate lengths. You may arrange | position continuously. The material of the buffer member 25 may be any material that can cope with the expansion and contraction of the space 3 between the floor slabs 1 and 1 ′, and synthetic rubber is preferable in terms of performance, durability, and cost.

  As shown in FIG. 2, the buffer member 25 may be disposed in the space portion 3 so that the upper surface 26 thereof is flush with the upper surfaces 12 and 12 ′ of the floor slabs 1 and 1 ′. May be arranged so as to be located below the upper surfaces 12 and 12 '. In the latter case, the space above the upper surface 26 is filled with a sealing material. If the upper surface 26 and the upper surfaces 12 and 12 'are formed flush with each other as in the former case, there is an advantage that the process is reduced and the cost is reduced because the filling of the sealing material becomes unnecessary. When a gap is generated between the space 3 and the buffer member 25, it is preferable to fill the generated gap with a sealing material as necessary.

  Next, as shown in FIG. 3, at least the upper surfaces 12, 12 ′ of the floor slabs 1, 1 ′ adjacent to the buffer member 25 (that is, the space portion 3) along the buffer member 25 disposed in the space portion 3. In order to improve the adhesiveness with the waterproof layer formed later by smoothing the surface, that is, to improve the waterproof performance, it is preferable to apply the base treatment material 30 to the portions 13 and 13 '. For example, an epoxy resin known to those skilled in the art can be used for the base treatment material 30.

  On the other hand, an insulating material 35 is disposed on the upper surface 26 of the buffer member 25, preferably via an elastic adhesive. As the insulating material 35, for example, a material having low adhesiveness with the stretchable waterproof layer 36 disposed on the insulating material 35 in a later step, such as a butyl tape with a nonwoven fabric, is used. Even if the width of the space portion 3 is greatly expanded or reduced by disposing the insulating material 35 having low adhesion to the waterproof layer 36 on the upper surface 26 of the buffer member 25, the waterproof layer 36 on the buffer member 25 There is an advantage that expansion and contraction is not hindered. In FIG. 3, the insulating material 35 is shown to be arranged with the same width as the upper surface 26 of the buffer member 25, but may be arranged with a width wider than the width of the upper surface 26 of the buffer member 25. .

The waterproof layer 36 is formed by spraying an elastomer on the base treatment material 30 and the insulating material 35 arranged as described above. The elastomer that forms the waterproof layer 36 may be any material that has high waterproofness, adhesiveness to the upper surface of the floor slab, and high stretchability. For example, ultrafast curing urethane resin, room temperature curing urethane resin, epoxy resin, unsaturated polyester resin Vinyl ester resin can be used. Among these, from the viewpoints of workability and economical efficiency, an ultrafast curing urethane resin is preferable. The ultrafast curing urethane resin is a two-component urethane resin obtained by mixing a main component mainly composed of an isocyanate component and a curing agent mainly composed of a polyol component. In one embodiment of the present invention, the main agent and the curing agent are each discharged by a high-pressure pump, and are sprayed after being impinged and mixed immediately before the nozzle by a spraying means such as a two-component collision mixing spray gun. In a short time, the waterproof layer 36 having a uniform thickness, no seams, and high elasticity can be formed. The thickness of the waterproof layer 36 to be formed is preferably as thin as possible as long as the waterproof function of the waterproof layer 36 is not impaired. In one embodiment of the present invention, about 2 mm is preferable.

  By forming such a waterproof layer 36, more reliable waterproof performance can be obtained while further improving the expansion / contraction performance of the space portion as compared with the prior art. In addition, by adopting the spraying method, a waterproof layer can be reliably and easily formed on parts having complicated shapes, for example, parts where ducts are arranged and parts that rise in the vertical direction such as wall height columns 2, 2 '. can do.

  The waterproof layer 36 may be deteriorated by ultraviolet rays, particularly when formed of an ultrafast curing urethane resin. Therefore, a waterproof layer that covers a space portion of an exposed portion where a protective layer to be described later is not formed, for example, a space portion of a wall height column 2, 2 ′ (that is, a rising portion) or a space portion of a duct portion where a duct is disposed, It is preferable to cover the waterproof layer 36 from ultraviolet rays with a protective film such as acrylic urethane.

  Next, as shown in FIG. 5, a protective layer 40 for protecting the waterproof layer 36 from damage due to ballast or ultraviolet rays is formed so as to cover at least the waterproof layer 36. The protective layer 40 is formed by first assembling a mold 45 for forming the protective layer 40 (see FIG. 4 as an example of the mold), and then pouring mortar or concrete into the mold 45 and drying it. Is formed by. In the protective layer 40, a gap or space 41 is provided above the space part 3 along the space part 3 so as to penetrate the thickness of the protective layer 40. Thereby, the clearance gap or the space 41 of the protective layer 40 expands / contracts with expansion / contraction of the space part 3. The width of the gap or space 41 is preferably about 30 mm to about 50 mm. The gap or space 41 is preferably filled with a resin foam or the like well known to those skilled in the art, or a weather-resistant steel plate is preferably disposed so as to cover the gap or space 41.

  The material of the protective layer 40 is not limited to mortar or concrete, and any material can be used as long as it can protect the waterproof layer 36 from damage and has excellent durability. Good. The protective layer 40 can also be formed of a stretchable material such as a synthetic resin. In this case, the gap or space 41 does not need to be provided. Although the protective layer 40 is shown in FIG. 5 as having a substantially trapezoidal cross section, the shape is not limited to this. For example, the protective layer 40 is formed in a shape having a rectangular cross section. May be. In the case of a viaduct where a slab track is laid, the protective layer 40 is formed on a floor slab in a portion other than a portion where a concrete slab to which a rail is fixed is installed. On the other hand, in the case of a viaduct where a ballast track is laid, the protective layer 40 is also provided under the road bed in order to prevent damage to the waterproof layer 36 due to ballast.

  It is preferable to arrange reinforcing members 50 and 50 'inside the protective layer 40 as shown in FIG. Since mortar or concrete which is a preferable material of the protective layer 40 is vulnerable to tensile stress, the protective layer 40 may crack or peel when the protective layer 40 is stretched. The reinforcing members 50, 50 ′ are disposed at appropriate positions of the protective layer 40 in order to reduce the risk of cracking or peeling off in the protective layer 40 and further improve the durability. The reinforcing members 50 and 50 'may be, for example, a reinforcing bar or a wire mesh, but are not limited thereto. In the case of using reinforcing members 50, 50 'of reinforcing bars or wire mesh, before pouring the mortar or concrete into the mold 45, the reinforcing members 50, 50' are appropriately attached by a support material extending from the surface of the floor slab 1, 1 '. The reinforcing members 50, 50 ′ are arranged inside the protective layer 40 by supporting at a high height and pouring mortar or concrete therethrough. Since cracks or peeling of the protective layer 40 often occurs from the upper surface of the protective layer 40, the position (height) where the reinforcing members 50 and 50 ′ are arranged is preferably near the upper surface of the protective layer 40. The reinforcing members 50 and 50 ′ are not arranged as shown in FIG. 5, but are protected by mixing the reinforcing members 50 and 50 ′ such as reinforcing fibers into the entire material of the protective layer 40. The tensile strength of the layer 40 may be increased.

  In another embodiment of the present invention, the shape of the buffer member and the shape of the receiving side of the buffer member can be changed so that the buffer member can be prevented from shifting and sinking after the buffer member is disposed. FIG. 6 shows, as an embodiment, a state in which a buffer member having a T-shaped cross section is disposed in a space portion having a T-shaped cross section. In this embodiment, the upper edge portions of the opposing end surfaces 11 and 11 'of the floor slabs 1 and 1' are formed by cutting out into L-shapes as indicated by reference numerals 60 and 60 'in FIG. As a result, the space 6 is formed so that the cross-sectional shape in the direction orthogonal to the extending direction of the space 6 is T-shaped. On the other hand, the buffer member 65 has a T-shaped cross section. As shown in FIG. 6, the buffer member 65 is disposed so as to be accommodated in the T-shaped space 6.

  In still another embodiment of the present invention, the cushioning member 65 uses a member having at least an upper part wider than the lower part, for example, a member having a cross-sectional shape formed in a shape such as a substantially inverted triangle or a substantially inverted trapezoid. You can also. In this embodiment, the shape of the space 6 in which the buffer member 65 is arranged is formed so that the buffer member 65 can be accommodated. That is, the floor slabs 1, 1 ′ are formed such that the width between the opposing end faces 11, 11 ′ of the adjacent floor slabs 1, 1 ′ is wider at the upper part than at the lower part. By forming the buffer member 65 and the shape of the space 6 in this manner, it is possible to prevent the buffer member from being displaced and sinking after the buffer member is disposed.

  When the buffer member 65 is disposed in the space 6, the base treatment material 61 and the adhesive 62 are applied to at least a part of the portion where the buffer member 65 and the end surfaces 11 and 11 ′ are in contact with each other as necessary. Is preferred. In FIG. 6, the upper surface 66 of the buffer member 65 is disposed so as to form the same surface as the upper surfaces 12 and 12 ′ of the floor slabs 1, 1 ′. The upper surface 66 of the buffer member 65 may be formed to be lower than the upper surfaces 12 and 12 ′. In this case, the space formed above the upper surface 66 of the buffer member 65 is filled with the sealing material. In the case where a gap is generated between the space 6 and the buffer member 65, it is preferable to fill the formed gap with a sealing material as necessary.

  In still another embodiment of the present invention, for example, a buffer member 75 having a shape as shown in FIG. 7 can be used. The buffer member 75 is formed so as to have an accordion-like cross-sectional shape that is provided so as to pass between the side wall 77 facing the side wall 77 extending in parallel with the space part and the side wall 77. The upper wall 78 has a U-shaped lower structure 79 that connects the lower ends of the side walls 77, and the upper wall 78, the side wall 77, and the hollow portion 76 surrounded by the lower structure 79. The width between the outer ends of the lower ends of the side walls 77 is formed so as to be at least wider than the width of the lower portion of the space portion 6 (that is, the narrow portion between the end faces 11 and 11 ′). The lower end of the side wall 77 protrudes outward from the lower end so as to more effectively prevent the buffer member 75 from dropping and shifting, and comes into contact with the bottom surface of the notched portion of the floor slabs 1, 1 ′ to thereby prevent the buffer member 75. You may form the protrusion part 80 for supporting this. Also in this case, the width between the outer ends of the protruding portion 80 is formed to be wider than the width of the lower portion (that is, the narrow portion) of the space portion 6 as in the case where the protruding portion 80 is not provided. The width of the lower structure 79 is formed to be the same as or narrower than the width of the lower portion of the space portion 6. In FIG. 7, it is described that the hollow portion 76 of the buffer member 75 is also present inside the lower structure 79. However, in another embodiment, the lower structure 79 is formed as a solid body. The hollow portion 76 may be present at the upper portion of the buffer member 75, that is, surrounded by the upper wall 78, the side wall 77, and the upper surface of the lower structure 79 formed as a solid body.

  In the buffer member 75, it is preferable that an upper wall 78, a side wall 77, and a lower structure 79 are integrally formed. The buffer member 75 may be formed by joining each of the separately formed members 77, 78, 79 with an adhesive or the like, but in this case, water can enter from the joint portion between the members. In consideration of the properties, it is necessary to make the joining of the members as strong as possible. The method of arranging the buffer member 75 in the space portion 6 is the same as the method described above when the buffer member 25 or the buffer member 65 is arranged in the space portion. The buffer member 75 has an advantage that the degree of freedom of the width is large because the upper wall 78 is formed in a bellows-like cross section and has the hollow portion 76 inside. That is, even if the construction accuracy of the notch portions of the end faces 11 and 11 ′ is low and the dimensional error of the width of the space portion 6 is large for each bridge, if the buffer member 75 having a single dimension is prepared, the buffer member 75 Since the width | variety can be easily changed when packing in the space part 6, workability | operativity improves very much and construction cost can be reduced. In addition, after the buffer member 75 is disposed in the space portion 6, the side wall 77 is placed between the end surfaces 11 and 11 ′ (or between the side wall 77 and the end surfaces 11 and 11 ′) by the elastic recovery force of the bellows-shaped upper wall 78. When the sealing material is filled, the waterproof performance is further improved because the sealing material is pressed against the end surfaces 11 and 11 ′ via the sealing material.

It is a figure which shows the railway viaduct in which the method concerning this invention is used. It is a figure of the floor slab containing a space part when it sees from the direction of the arrow A of FIG. It is a figure which shows the state by which the base material and the insulating material are arrange | positioned on the elastic member arrange | positioned in a space part, and the upper surface of a floor slab, and the waterproof layer was formed on it. It is a figure which shows the state in which the formwork was formed on the waterproof layer shown by FIG. It is a figure which shows the state in which the protective layer was formed on the waterproof layer shown by FIG. It is a figure which shows embodiment in the case of using the buffer member formed in T shape. It is a figure which shows embodiment in the case of using the buffer member which has a bellows-shaped upper wall and a hollow part inside.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1 'Floor slab 2, 2' Wall height column 3, 4, 6 Space part 5 Track 10 Railway viaduct 11, 11 'End surface 12 of a floor slab 12 12 Upper surface of a floor slab 13 13' Part of upper surface of a floor slab 21 , 61, 71 Base treatment material 22, 62, 72 Adhesives 25, 65, 75 Buffer member 26, 66 Upper surface 30 of cushion member Base treatment material 35 Insulation material 36 Waterproof layer 40 Protective layer 41 Gap or space 45 Formwork 50, 50 'reinforcing member 60, 60' floor slab cutout portion 76 hollow portion 77 side wall 78 upper wall 79 lower structure

Claims (9)

A method for joining adjacent bridges together,
Arranging a buffer member in a space formed between adjacent bridges;
Forming a stretchable waterproof layer so as to cover the entire upper surface of the buffer member disposed and at least part of the upper surface of the bridge adjacent to the space portion;
So as to cover a portion of said top surface of said bridge that is adjacent along the sides of the part of the part and the waterproof layer of the waterproof layer, forming a protective layer,
Covering the whole of the waterproof layer not covered with the protective layer with a protective film for protecting the waterproof layer from ultraviolet rays;
A method comprising the steps of:   The method according to claim 1, wherein the waterproof layer is formed by spraying an elastomer.   The method according to claim 2, wherein the elastomer is a two-component urethane resin.   In the step of arranging the buffer member, in the space portion formed by making the distance between the upper portions of the opposite end surfaces of the adjacent bridges wider than the distance between the lower portions of the opposite end surfaces, the width of the upper portion is increased. The method according to claim 1, comprising disposing the buffer member formed wider than a width of a lower part.   The buffer member has a width narrower than a width between an upper wall portion having a bellows-shaped cross section extending in parallel with the space portion, side wall portions formed on both sides of the upper wall portion, and at least an outer end of a lower end of the side wall portion. A space part surrounded by the lower structure, the upper wall part, the side wall part, and the lower structure, which extends downward from the lower end of the side wall part so as to connect the side wall parts. The method according to claim 4, further comprising: a hollow portion extending along the line. The step of forming a waterproof layer having stretchability includes:
Disposing an insulating material on at least the buffer member;
Forming a waterproof layer having elasticity on the insulating material;
The method of claim 1, comprising:   The material of the protective layer is concrete or mortar, and the step of forming the protective layer includes a step of providing a gap penetrating the thickness of the protective layer above the space portion along the space portion. The method of claim 1, characterized in that   The method according to claim 1, wherein the protective layer includes a reinforcing member. The method according to claim 8 , wherein the reinforcing member is a wire mesh or a reinforcing bar, and is disposed in the protective layer so as to extend in a plane parallel to the upper surface of the bridge.

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