JP5006277B2 - Vertical telescopic device - Google Patents

Description

  The present invention relates to a telescopic device installed at a joint between bridges or between a bridge and an abutment. In particular, the present invention relates to a simple steel vertical telescopic device that is used for a road bridge and configured by connecting divided blocks.

  When the road width is wide, the simple steel vertical telescopic device used for the seam portion of a road bridge or the like is divided into a plurality of blocks in the road width direction, and the divided blocks are connected to each other at the construction site. Each divided block includes a pair of opposed corrugated vertical plates, and a sheet-like seal rubber is installed between the vertical plates in a state of being bent in an abbreviated shape, thereby forming a seal portion.

  When the divided blocks are connected, the seal portions are also connected to each other, so that it is necessary to prevent water leakage at the connection portion between the seal members. As one of the measures for preventing water leakage at the connecting portion between the seal members, for example, a structure is known in which water blocking films are provided at both ends of the sealing portion constituting the connecting portion, and the sealing portion is made independent for each divided block. (Patent Document 1).

By the way, since the space | interval of vertical plates changes in an expansion-contraction apparatus, it is necessary to deform | transform a water stop film corresponding to the change of the space | interval of vertical plates. Therefore, in patent document 1, while extending and bending one water-stop film of the division | segmentation block connected to the outer side of a groove | channel, it expands and contracts by denting the other water-stop film of a division | segmentation block inside a groove | channel, and making it bend. It corresponds. Moreover, the water-tight structure between water-stopping films is ensured and the water leak is prevented by sticking the surface of the overhanging water-stopping film and the recessed water-stopping film.
Japanese Patent Laid-Open No. 08-284104

  However, in the configuration of Patent Document 1, it is necessary to secure the watertight structure by bringing the water-stopping films into close contact with each other at the same time as constructing each block, and the work for obtaining the watertight structure is complicated. In addition, in order to make the overhanging waterstop film and the recessed waterstop film adhere to each other, the radius of the overhanging waterstop film must be smaller than the radius of the recessed waterstop film by the thickness of the waterstop film. There is. For this reason, the lengths of the two water-stopping films that are in close contact with each other are different, and both the water-stopping films exhibit different behaviors during expansion and contraction, so that a gap is formed on the close-contact surface and water leakage is likely to occur.

  Therefore, the present invention has been made in view of the above-described problems, and can easily obtain a watertight structure between the water blocking films and can also improve the water blocking property between the water blocking films. An object is to provide a vertical telescopic device.

  The vertical expansion / contraction device according to one aspect of the present invention is divided into at least first and second blocks in the bridge width direction, and is used by connecting the first and second blocks in the bridge width direction. A telescopic device, wherein the first and second blocks are opposed to each other via a predetermined gap in the bridge axis direction, and one end in the bridge axis direction is one longitudinal axis. An elastic sheet member that is bonded to the plate member, the other end is bonded to the other vertical plate member, and is laid between the pair of vertical plate members, and is elastic between the pair of vertical plate members. A groove portion having a sheet member as a bottom surface is formed. And in the connection part of a 1st and 2nd block, the concave water stop film which plugs up the edge part of a groove part is continuously arranged by the edge part in the bridge width direction of each elastic sheet member of a 1st and 2nd block. The The concave water blocking film is formed so as to be recessed inward along the bridge width direction, whereby a hollow portion is formed between the concave water blocking films, and a bag body is inserted into the hollow portion. It is characterized by.

  The upper part of the bag body is opened, and it is preferable that an upper end portion of the bag body is formed so as to be folded back from the upper end portion to the outside of the bag body, and a folded portion extending downward is continuously provided. In this case, it is preferable that the upper end part of each concave water-stop film is inserted between the folded part and the bag. In addition, it is preferable that the inner surface of the folded portion is bonded to the concave water blocking film. Moreover, the outer peripheral surface of the bag body may be bonded to the concave water blocking film.

  In the connecting portion, it is preferable that each of the end portions in the bridge width direction of the elastic sheet member is formed with a concave portion recessed inward by a concave water-stop film, and these concave portions are integrated to form a hollow portion. . In this case, it is better that the opening of the recess is closed, and the bottom surface of the bag body preferably exhibits a shape along the surface closing the opening.

  The hollow portion is preferably a bottomed hollow portion having a concave water-stop membrane as a side surface, for example. Further, the elastic sheet member may have an erection part formed between one end and the other end of the sheet member, and the bottom surface of the hollow part may be an erection part.

  In another aspect of the present invention, the vertical telescopic device is divided into at least first and second blocks with respect to the bridge width direction, and is used by connecting the first and second blocks in the bridge width direction. It is a type | mold expansion-contraction apparatus, Comprising: A pair of vertical board member installed so that each of the 1st and 2nd blocks may face each other via a predetermined gap in a bridge axis direction, and one end in a bridge axis direction is one side An elastic sheet member that is bonded to the vertical plate member and the other end is bonded to the other vertical plate member and is laid between the pair of vertical plate members, and between the pair of vertical plate members, A groove portion having the elastic sheet member as a bottom surface is formed. In the connecting portion of the first and second blocks, a first water-stop film that closes the end of the groove is connected to the end of the elastic sheet member of the first block in the bridge width direction. A second water blocking film that blocks the end of the groove is connected to the end of the elastic sheet member of the second block in the bridge width direction. The first and second water blocking films are in close contact with each other, thereby connecting the elastic sheet members of the first and second blocks. And the upper end part of the 2nd water stop film is connected with the return part formed so that it may return from the upper end part to the 1st water stop film side, and the upper end part of the 1st water stop film is It is inserted between the folded portion and the second water blocking film.

  In another aspect of the present invention, the first water blocking film is a concave water blocking film formed so as to be recessed inward of the first block along the bridge width direction. Is a convex water stop film formed so as to protrude outward of the second block along the bridge width direction, and it is preferable that the convex water stop film is fitted inside the concave water stop film. Further, for example, the concave water blocking film forms a concave part with the lower end opening blocked, and the convex water blocking film forms a convex part with the lower end opening blocked, and the convex part fits into the concave part. The elastic sheet members of the first and second blocks are connected. At this time, it is preferable that the surface that closes the opening at the lower end of the convex portion is in close contact with the surface that closes the opening at the lower end of the concave portion.

  In the present invention, since the bag body is fitted into the hollow portion formed between the pair of water blocking films to form a watertight structure, the watertight structure between the water blocking films is easily ensured. Moreover, the water-stopping property between the water-stopping films is enhanced by providing the folded portion in the bag body.

  FIG. 1 is a plan view of a simple steel vertical telescopic device for bridges according to a first embodiment of the present invention as viewed from above. In FIG. 2, a simple steel vertical telescopic device 10 for a bridge is applied to a road bridge, and is disposed at a joint between two bridges, for example.

  The simple steel vertical expansion and contraction device 10 is divided into a plurality of divided blocks 11 in the width direction, and is configured by connecting the divided blocks 11 in the bridge width direction. Each divided block 11 includes a pair of vertical plate members 13A and 13B that face each other with a predetermined gap in the bridge axis direction of the road bridge (longitudinal direction of the road bridge). As shown in FIG. 1, the vertical plate members 13 </ b> A and 13 </ b> B have a wavefront curved surface along the bridge width direction. The inner surfaces of the vertical plate members 13A and 13B are along the vertical direction and are parallel to each other.

  Bottom plates 15A and 15B projecting outward from the vertical plate members 13A and 13B are connected to lower end surfaces of the vertical plate members 13A and 13B, respectively. Further, the vertical plate members 13A and 13B are provided with a plurality of anchor members 16A and 16B extending from these outer surfaces. The vertical plate member 13A is fixed to one bridge portion 12A by the bottom plate 15A and the anchor member 16A. Further, the vertical plate member 13B is fixed to the other bridge portion 12B by the bottom plate 15B and the anchor member 16B. Thereby, the separation distance between the vertical plate members 13A and 13B changes with the expansion and contraction of the bridge portions 12A and 12B, that is, the road bridge.

  Between the vertical plate members 13A and 13B, a long elastic sheet member 18 formed of an elastic material such as a sheet-like rubber and long in the bridge width direction is provided. The elastic sheet member 18 has one end portion (side portion 18A, see FIG. 3) in the bridge axis direction bonded to the inner surface of the vertical plate member 13A and the other end portion (side portion 18B, see FIG. 3). Is bonded to the inner surface of the vertical plate member 13B and is installed between the vertical plate members 13A and 13B.

  In each divided block 11, connecting metal fittings 22A and 22B are connected to both end portions 27A and 27B in the bridge width direction of the vertical plate members 13A and 13B. The connecting fittings 22A and 22B extend outward from the vertical plate members 13A and 13B. The adjacent divided blocks 11 are connected and fixed to each other by, for example, bolting the connecting fittings 22A and 22A (and 22B and 22B) of both blocks and fastening them with nuts. Thereby, in each connection part, the edge part (connection end part 18X) in the width direction of the elastic sheet member 18 of one block 11 is the edge part (connection end part) of the elastic sheet member 18 of the other block 11 in the width direction. 18Y).

  FIG. 3 is a partial cross-sectional view of the divided block. As shown in FIG. 3, the side portions 18A and 18B constituting both ends in the bridge axis direction of the elastic sheet member 18 are arranged along the inner surfaces (opposing surfaces) 17A and 17B of the vertical plate members 13A and 13B, The inner surfaces 17A and 17B are bonded. In the elastic sheet member 18, a region sandwiched between the side portions 18 </ b> A and 18 </ b> B constitutes a construction portion 18 </ b> C that is constructed between the inner surfaces 17 </ b> A and 17 </ b> B. Thus, a groove portion 20 is formed between the pair of vertical plate members 13A and 13B, with the erected portion 18C as the groove bottom surface and the side portions 18A and 18B as the groove side surfaces. The side portions 18A and 18B and the erection portion 18C have the same thickness throughout the entire elastic sheet member 18, but as shown in FIGS. 4 and 5, both end portions (connection end portions) in the bridge width direction. These thicknesses in 18X and 18Y are thinner than those in other portions.

  The erection part 18C is recessed downward with the center part 18D in the bridge axis direction as a center, and is formed in a substantially V-shaped cross section formed in a curve. When the separation distance D1 between the vertical plate members 13A and 13B changes, the installation portion 18C bends and deforms according to the change in the separation distance D1. That is, the erection part 18C is deeply deformed downward when the separation distance D1 becomes narrower, and the erection part 18C becomes deeper and deeper when the separation distance D1 becomes wider.

  The elastic sheet member 18 is a member that secures a sealing property between the pair of vertical plate members and prevents rainwater and the like from leaking downward from the gap. When the separation distance D of the vertical plate members changes, the elastic sheet member 18 It bends and deforms while maintaining its sealing property. In addition, in the vertical plate members 13A and 13B, regions below the installation portion 18C are covered with covering rubbers 19A and 19B that are molded integrally with the elastic sheet member 18.

  Next, with reference to FIGS. 4 and 5, the configuration of a portion (connecting portion) where the divided blocks 11 are connected to each other will be described in more detail. In the connecting portion, concave water blocking films 30 and 30 are provided on the connecting end portions 18X and 18Y of the elastic sheet members 18 and 18 of the divided blocks 11 and 11, respectively. Each of the concave water blocking films 30 and 30 covers and closes the end of each of the groove portions 20 and 20 to prevent water accumulated in the groove portions 20 and 20 from leaking from the connecting portion. The concave water blocking films 30 and 30 are formed so as to be recessed inward of the divided blocks 11 along the bridge width direction, and bend together with the elastic sheet member 18 as the separation distance D1 (see FIG. 3) changes. Deform.

  The concave water blocking film 30 has both end portions 30A and 30B in the bridge axis direction continuous to the side edges of the side portions 18A and 18B, and is recessed from the both end portions 30A and 30B to the inside of the divided block 11. The concave portion 32 is formed inside the concave water blocking film 30. The lower end 30D of the concave water blocking film 30 is connected to the upper surface of the erection part 18C, and the opening of the lower end 30D of the recess 32 is closed by the upper surface of the erection part 18C. And the concave water-stop film 30 exhibits the shape which stood | started up vertically from the upper surface of the construction part 18C.

  The concave water blocking film 30 is curved and recessed inward, thereby exhibiting a substantially V-shaped cross section formed in a curved shape. It is arranged at the position that matches. Further, as shown in FIGS. 4 and 5, the lower end 30D of the concave water blocking film 30 connected to the erection part 18C advances downward from each of the end parts 30A and 30B toward the V-shaped top part 30C and the central part 18D. The lower end of the V-shaped top portion 30C is connected to the central portion 18D of the erection portion 18C.

  In the connection part of the divided blocks 11 and 11, the connection end parts 18X and 18Y (that is, the side parts 18A and 18A (18B and 18B) and the erection parts 18C and 18C) are abutted with each other. Accordingly, the end portions 30A and 30A (30B and 30B) of the concave water blocking films 30 and 30 are also connected or brought close to each other, and the concave portions 32 and 32 are integrated to form a hollow portion between the concave water blocking films 30 and 30. 33 is formed. The hollow portion 33 has the erected portions 18C and 18C as the bottom surface, the concave water blocking films 30 and 30 as the side surfaces, and is open upward.

  In the present embodiment, the connecting end portions 18X and 18Y are connected via a bag-like connecting member 40 formed of an elastic material such as rubber as shown in FIGS. The bag-shaped connecting member 40 includes a bag body 43 that is open at the top and is fitted into the hollow portion 33, and a folded portion 44 that is formed so as to be folded back from the upper end portion of the bag body 43. Molded.

  The bag body 43 includes a bottom surface 47 and a cylindrical body 48 that rises vertically upward from the bottom surface 47. The cylindrical body 48 swells away from each other along the bridge width direction, and includes two half-cylinders 41 and 41 each having a substantially V-shaped cross section formed in a curved shape. Exhibits a shape along the inner peripheral surfaces 30N, 30N of the concave water blocking films 30, 30. These two half-cylinders 41 and 41 are formed in a cylindrical body 48 by connecting both end portions 41A and 41A (and 41B and 41B) at a central portion 43C in the bridge width direction of the bag body 43. Further, the V-shaped top portions 41 </ b> C and 41 </ b> C of the half cylinders 41 and 41 are disposed in the central portion 43 </ b> X in the bridge axis direction of the bag body 43.

  The folded portion 44 includes folded elements 45 and 45 that are formed so as to be folded from the upper end portions 41U and 41U of the half cylinders 41 and 41 to the outside of the bag body 43 and extend downward in the vertical direction. Between the inner surfaces 45B, 45B of the folding elements 45, 45 and the outer peripheral surfaces of the half cylinders 41, 41, a narrow groove having connection portions 45A, 45A with the upper end portions 41U, 41U of the folding elements 45, 45 as the groove bottom surfaces 55, 55 are formed.

  The folding elements 45, 45 are provided from the end 41A to the end 41B of each of the half cylinders 41, 41, but they are not connected to each other. The length of each folding element 45, 45 in the vertical direction is sufficiently shorter than the length of the half cylinders 41, 41 in the vertical direction.

  The bottom surface 47 of the bag body 43 is composed of two half bottom surfaces 49, 49. These half bottom surfaces 49, 49 are located at one end portions 49 A, 49 A in the bridge width direction at the center portion 43 C in the bridge width direction of the bag body 43. It is connected continuously. The widths of the half bottom surfaces 49 and 49 are reduced along the half cylinders 41 and 41 from the one end portions 49A and 49A to the other end portions 49B and 49B in the bridge width direction. Each of the half bottom surfaces 49 and 49 is recessed downward with the central portion 43X as a center, and has a shape along the upper surface of the erection portions 18C and 18C that block the opening at the lower end of the concave portions 32 and 32. And the bottom surface of the hollow portion 33).

  The outer edges 49E, 49E of the half bottom surfaces 49, 49 are connected to the lower ends of the respective half cylinders 41, 41, that is, the half cylinders 41, 41 are raised vertically upward from the outer edges 49E, 49E. Presents a shape. Each of these outer edges 49E, 49E is curved so as to proceed downward as shown in FIG. 9 from the one end 49A, 49A toward the other end 49B, 49B, and the concave water blocking films 30, 30 are provided. Are arranged along the connecting portions (that is, the lower ends 30D and 30D) between the installation portions 18C and 18C.

  In addition, the recesses of the half bottom surfaces 49 and 49 become shallower from the one end portions 49A and 49A toward the other end portions 49B and 49B, but the vertical lengths of the half cylinders 41 and 41 become longer. The height is the same from end to end in the axial direction. Similarly, as shown in FIG. 5, the hollow portion 33 has the same height from end to end in the bridge width direction. The height of the bag body 43 is substantially the same as the height of the hollow portion 33.

  In the present embodiment, when the bag body 43 is inserted into the hollow portion 33, the upper end portions of the concave water blocking films 30, 30 are formed between the folding elements 45, 45 and the half cylinder bodies 41, 41. It will be inserted into the grooves 55 and 55. That is, the folding elements 45, 45 are inserted outside the concave water blocking films 30, 30 so as to cover the upper ends of the concave water blocking films 30, 30. And while the outer peripheral surfaces of the semi-cylinders 41, 41 are in close contact with the inner peripheral surfaces 30N, 30N of the concave water blocking films 30, 30, the inner surfaces 45B, 45B of the folded elements 45, 45 are the concave water blocking films 30, 30 is closely attached to the outer peripheral surfaces 30M and 30M of the upper end portion.

  The outer peripheral surfaces of the half cylinders 41, 41 and the inner surfaces 45B, 45B of the folding elements 45, 45 are respectively bonded to the inner peripheral surfaces 30N, 30N and the outer peripheral surfaces 30M, 30M with known adhesives. Similarly, the half bottom surfaces 49 and 49 are bonded to the upper surfaces of the erection portions 18C and 18C constituting the bottom surface of the hollow portion 33, respectively. In addition, since the height of the hollow part 33 and a bag body is substantially the same as above-mentioned, the upper end part of the concave water-stop films 30 and 30 can be inserted to the bottom face of the narrow groove 55. FIG.

  As described above, since the bag body 43 is adhered to the side surface and the bottom surface of the hollow portion 33, the space between the concave water blocking films 30 and 30 is blocked by the bag-shaped connection member 40, and thus the connection end 18 </ b> X. , 18Y is secured. Note that the bag-like connecting member 40 is formed of an elastic material such as rubber and bends and deforms together with the concave water blocking films 30 and 30 as the separation distance D1 (see FIG. 3) changes, so that the separation distance D1 changes. However, adhesion to the concave water-stop films 30 and 30 is ensured.

  Since the bag-like connecting member 40 can be inserted from above after each divided block 11 is installed and installed in the hollow portion 33, in this embodiment, a water stop structure can be easily obtained. In addition, the bag-like connecting member 40 can be easily repaired after construction.

  Furthermore, by inserting the upper ends of the concave water blocking films 30, 30 into the narrow groove 55, the bonding surface between the bag body 43 and the concave water blocking films 30, 30 is covered by the folded portion 44. Therefore, even if the adhesion between the bag body 43 and the concave water blocking film 30 is peeled off, the folded portion 44 can prevent water from entering between them. Moreover, since the bag body 43 is restrained by the folding | returning part 44, it becomes difficult to peel the bag body 43 from the concave water-stop film 30, and it can improve the water stop property between the connection end parts 18X and 18Y.

Next, a second embodiment will be described with reference to FIGS.
In the second embodiment, the connection end portion 18Y is provided with a concave water blocking film 30 that closes the end portion 20 of the groove portion, as in the first embodiment, and the opening at the lower end is blocked by the installation portion 18C. A concave portion 32 is formed. On the other hand, a convex water blocking film 60 that blocks the end 20 of the groove is connected to the connecting end 18X. The convex water blocking film 60 includes a half cylinder 41 having a configuration similar to that of the first embodiment, and a half bottom surface 49. That is, the convex water blocking film 60 has a shape in which the opening at the lower end of the semi-cylindrical body 41 having a shape obtained by cutting the cylindrical body along the axial (vertical) direction is closed by the semi-bottom surface 49.

  The convex water blocking film 60 protrudes outward from the block 11 along the bridge width direction from the connecting end portion 18 </ b> X to form a convex portion 67. Specifically, in the half cylinder 41, these both end portions 41A and 41B are connected to the side edges (end portions in the width direction) of the side portions 18A and 18B of the elastic sheet member 18 so as to protrude therefrom. Formed. The half bottom surface 49 is formed such that one end portion 49A is connected to an end portion in the bridge width direction of the erection portion 18C and protrudes therefrom. With the above configuration, the end portion of the groove portion 20 formed by the side portions 18 </ b> A and 18 </ b> B and the erection portion 18 </ b> C is blocked by the convex water blocking film 60.

  A folding element (folding portion) 45 is provided at the upper end portion 41 </ b> U of the half cylinder 41. The folding element 45 is continuously provided so as to be folded from the upper end portion 41U of the semi-cylindrical body 41 to the outside of the convex water blocking film 60 (the convex portion 67), and forms a narrow groove 55 as in the first embodiment.

  In the present embodiment, the convex portion 67 formed by the convex water blocking film 60 is fitted into the concave portion 32 formed by the concave water blocking film 30, and the connecting end portions 18X and 18Y of the elastic sheet members 18 and 18 are inserted. Will be connected. Here, each of the outer circumferential surfaces of the convex water blocking film 60, that is, the half cylinder 41 and the half bottom surface 49, is the inner circumferential surface of the concave water blocking film 30 and the lower surface of the concave portion 32, as in the first embodiment. The shape along each upper surface of the construction part 18C that closes the wall is exhibited.

  Further, when the convex water blocking film 60 is fitted into the concave water blocking film 30, the upper end portion of the concave water blocking film 30 is inserted into the narrow groove 55. Then, the inner surface 45B of the folded element 45 and the outer peripheral surface of the semi-cylindrical body 41 are in close contact with and bonded to the outer peripheral surface 30M and the inner peripheral surface 30N of the concave water blocking film 30, respectively. In addition, the half bottom surface 49 is also adhered and adhered to the upper surface of the installation portion 18C.

  As described above, in the present embodiment, the water-tightness between the connecting end portions 18X and 18Y is secured by the convex water-proof film 60 being adhered to and adhered to the concave water-proof film 30. Moreover, by providing the folding element 45 on the convex water blocking film 60, the water blocking property between the connecting end portions 18X and 18Y can be improved as in the first embodiment.

  In the second embodiment, the folding element 45 is provided on the convex water blocking film 60, but may be provided on the concave water blocking film 30. In this case, the folding element 45 is formed so as to be folded back from the upper end of each concave water blocking film 30 into the concave portion 32 and extends downward.

It is the top view which looked at the vertical expansion-contraction apparatus from upper direction. It is sectional drawing of a vertical expansion-contraction apparatus. It is a fragmentary sectional view of a main part block part. It is the top view which looked at the connection part in a 1st embodiment from the upper part. It is a side view of the connection part in a 1st embodiment. It is the top view which looked at the bag-shaped connection member from the upper part. It is a side view of a bag-like connection member. It is the front view which looked at the bag-shaped connection member from the right side in FIG. It is a perspective view which shows only the half of a bag-shaped connection member. It is the top view which looked at the connection part in a 2nd embodiment from the upper part. It is a side view of the connection part in 2nd Embodiment.

Explanation of symbols

10 Vertical expansion and contraction device 11 Divided blocks (first and second blocks)
13A, 13B Vertical plate member 18 Elastic sheet member 18A, 18B Side (one end and the other end)
18C Construction section 18X, 18Y Connection end (end in the bridge width direction)
DESCRIPTION OF SYMBOLS 30 Concave water stop film 32 Concave part 33 Hollow part 40 Bag-shaped connection member 41 Half cylinder body 43 Bag body 44 Folding part 47 Bottom face 48 Cylindrical body 49 Half bottom face 60 Convex water stop film 67 Convex part

Claims (7)

A vertical expansion / contraction device that is divided into at least first and second blocks with respect to the bridge width direction and is used by connecting the first and second blocks in the bridge width direction,
A pair of vertical plate members installed so that each of the first and second blocks faces each other with a predetermined gap in the bridge axis direction;
One end of the bridge axis direction is bonded to one of the vertical plate member and the other end is bonded to the other of the vertical plate member, and a elastic sheet member that will be installed between the pair of vertical plates member ,
Between the pair of vertical plate members, a groove portion having the elastic sheet member as a bottom surface is formed,
In the connecting portion of the first and second blocks, a concave water blocking film that closes the end portion of the groove portion is connected to the end portion in the bridge width direction of the elastic sheet member of each of the first and second blocks. Established,
The concave water blocking film is formed so as to be recessed inward along the bridge width direction, so that a hollow portion is formed between the concave water blocking films, and a bag body is inserted into the hollow portion. A vertical expansion and contraction device characterized by that. The bag body is opened at the top,
The upper end portion of the bag body is formed so as to be folded back from the upper end portion to the outside of the bag body, and a folded portion extending downward is continuously provided.
The vertical expansion / contraction device according to claim 1, wherein an upper end portion of each of the concave water blocking films is inserted between the folded portion and the bag body.   The vertical expansion / contraction device according to claim 2, wherein an inner surface of the folded portion is bonded to the concave water blocking film.   The vertical expansion / contraction device according to claim 1, wherein an outer peripheral surface of the bag body is bonded to the concave water blocking film.   In the connecting portion, at each end portion in the bridge width direction of the elastic sheet member, a concave portion recessed inward by the concave waterproof film is formed, and these concave portions are integrated to form a hollow portion. The vertical expansion-contraction apparatus according to claim 1.   The vertical expansion / contraction device according to claim 1, wherein the hollow portion is a bottomed hollow portion having the concave waterstop film as a side surface. The elastic sheet member has an erected part formed between the one end and the other end of the sheet member,
The vertical expansion / contraction device according to claim 5, wherein a bottom surface of the hollow portion is the installation portion.

Images