JP2016196745A - Extensible flexible joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an extensible flexible joint having a flexible water cut-off member and a reinforcing member that remain firmly fixed and cannot be pulled out easily, even when exposed to unexpected and excessive tensile force caused by a rise in outside/inside water pressure and other reasons, or when fixing force of a holding member is weakened a bit.SOLUTION: An extensible flexible joint is installed on a joint 3 between structural bodies 1, 2, and includes: a flexible water cut-off member 6 having an extensible part 4 in an intermediate part and a sheet-form anchorage part 5 on both ends of the intermediate part; a holding member 8 having a plate-form 7 that sandwiches and supports the sheet-form anchorage part 5 by exerting pressure together with the structural body 1; and a fixing member 9 connected to the structural body 1 and the holding member 8, and generating axial force by narrowing a distance between the structural body 1 and the holding member 8 for pressing the holding member 8 against the sheet-form anchorage part 5. The sheet-form anchorage part 5 includes an extension part 10, while the extension part 10 includes a top surface protruded streak 11 that prevents pull-out of the flexible water cut-off member 6, and a bottom surface protruded streak 12 that causes the flexible water cut-off member 6 to be curved toward the holding member side, when the holding member 8 is pressed against the sheet-form anchorage part 5 by the fixing member 9.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a telescopic flexible joint.

  In joints such as underdrains, open pits, locks, corridors, caves, joints, and other concrete facilities constructed in the ground, it is possible to prevent the intrusion of sediment and water from inside and outside. It is necessary to stop the water. On the other hand, the structures on both sides of the joint joint will sink unevenly, displace during an earthquake, and expand and contract due to temperature changes. Therefore, joints having sealing properties, water-stopping properties, flexibility, stretchability, and the like are installed at joints, and various types of joints are being studied. Various structures for fixing the joint to the structure have been studied.

  As a member to be installed in such a joint, the present applicant, for example, in Patent Document 1, fixes a flexible waterproofing member having a bulging portion at the center and fixing portions on both sides, and fixing the fixing portion to a structure. A flexible water-stop joint including a presser plate is disclosed. In this flexible waterproof joint, in order to prevent the flexible waterproof member from extending due to water pressure and reducing its thickness, or the surface pressure from being lowered and the water stoppage from being lowered, the protrusion that extends in the axial direction is prevented. Prepare the article. Further, as specific examples of the protrusions, a protrusion formed by welding round steel and a protrusion extending in the axial direction of the presser plate are disclosed.

  In addition, as a fixing structure of the expansion joint, the present applicant has disclosed in Patent Document 2 that a pressing member that is pressed against the attachment portion at both ends of the expansion joint so as to be sandwiched between the structure and an anchor attached to the structure. The intermediate plate-shaped part is fixed with bolts, and the base end portions of the both-side plate parts formed on both sides of the intermediate plate-shaped part are applied to the structure, and the holding member is pressed by pressing the holding member at the distal end part of the both side plate parts. An expansion joint fixing structure including a fixing member that is in pressure contact is disclosed. Moreover, it discloses that the outside of the expansion joint is covered with a protective cover.

JP 2004-353225 A JP 2012-225037 A

On the other hand, in recent years, a large-scale earthquake may have occurred, and the joint can be removed even when unexpectedly excessive tension is applied due to an increase in internal / external water pressure, or when the fixing force of the holding member is somewhat weakened. A difficult structure is required.
Accordingly, an object of the present invention is to provide a flexible water-stopping member and a reinforcing member even when an unexpected excessive tension is applied due to an increase in internal / external water pressure or the fixing force of the pressing member is somewhat weakened. It is to provide an expansion / contraction flexible joint that has a strong fixing force and is difficult to come off.

In order to achieve the above object, the expansion / contraction flexible joint according to the present invention includes:
A flexible water-stopping member that is erected on the joint between the structures, and has a stretchable part in the middle part, and a sheet-like fastening part at both ends of the middle part,
A pressing member provided with a plate-like portion that supports the sheet-like attachment portion by applying pressure to the structure body; and
A fixing member that is connected to the structure and the pressing member to reduce the distance between the structure and the pressing member to generate an axial force, and press-contacts the pressing member to the sheet-like attachment portion;
The sheet-like adhesive portion includes an extending portion extending from a portion in contact with the plate-like portion;
The extending portion includes an upper surface protrusion that prevents the flexible water-stopping member from being pulled out on the surface on the pressing member side, and the sheet-like attachment of the pressing member with the fixing member on the surface on the structure side A lower surface protrusion that bends the flexible water-stopping member toward the pressing member when being pressed against the portion;

The expansion / contraction flexible joint is:
The presser member is a plate-like member in which an anchor bolt hole is formed, and includes a presser protrusion that protrudes in the direction of the flexible water stop member,
The fixing member preferably includes an anchor bolt and a nut embedded in the structure.

The expansion / contraction flexible joint according to the present invention is
A flexible water-stopping member that is erected on the joint between the structures, and has a stretchable part in the middle part, and a sheet-like fastening part at both ends of the middle part,
A pressing member provided with a plate-like portion that supports the sheet-like attachment portion by applying pressure to the structure body; and
A fixing member that is connected to the structure and the pressing member to reduce the distance between the structure and the pressing member to generate an axial force, and press-contacts the pressing member to the sheet-like attachment portion;
The sheet-like adhesive portion includes an extending portion extending from a portion in contact with the plate-like portion;
The extending portion is provided with an upper surface protrusion that prevents the flexible water-stopping member from being pulled out on the surface on the pressing member side,
The pressing member is a groove-shaped member provided with side plates standing upright on both ends of the plate-like portion on the joint side and the distant side of the joint, and includes a pressing protrusion protruding in the direction of the flexible water-stopping member,
The fixing member includes an intermediate part that forms an anchor bolt hole, a fixing part that is fixed to one end of the intermediate part against the channel member, and a base end part that is applied to the structure at the other end of the intermediate part. A member, an anchor bolt embedded in the structure, and a nut are provided.

The expansion / contraction flexible joint is:
The extending portion further protrudes from a lower surface that bends the flexible water blocking member toward the pressing member when the pressing member is pressed against the sheet-like attachment portion with the fixing member on the surface on the structure side. It is preferable to provide a strip.

The expansion / contraction flexible joint is:
A reinforcing sheet that covers a surface of the flexible waterproofing member opposite to the structure, the reinforcing sheet being further compressed by the flexible waterproofing member and the pressing member, and an end portion further from the pressing member; It is preferable that they are arranged so as to extend.

The expansion / contraction flexible joint is:
It is preferable that the sheet-like brazing portion is provided with a water stopping ridge that extends in a direction substantially parallel to the joint, being crushed on the surface of the sheet-like bracing portion facing the structure to increase the water-stopping property. .

  According to the present invention, even when an unexpected excessive tension is applied due to an increase in internal / external water pressure or the fixing force of the pressing member is somewhat weakened, the flexible waterproofing member and the reinforcing member are fixed. An expansion / contraction flexible joint that is strong and difficult to come off is provided.

It is sectional drawing which shows the expansion-contraction flexible joint which concerns on one embodiment of this invention. It is sectional drawing which shows before and after fixation of the expansion-contraction flexible joint which concerns on one embodiment of this invention. It is sectional drawing which shows the expansion-contraction flexible joint which concerns on the other embodiment of this invention. It is sectional drawing which shows before and after fixation of the expansion-contraction flexible joint which concerns on the other embodiment of this invention. It is sectional drawing of the various aspects of the pressing protrusion of a pressing member. It is sectional drawing of the various aspects of the pressing protrusion of a pressing member. It is sectional drawing which shows the expansion-contraction flexible joint which concerns on the other embodiment of this invention. It is sectional drawing which shows the state which narrowed the reinforcement sheet with the pressing member. It is the schematic of the test apparatus used by the comparative example. It is the table | surface which showed the schematic of the test apparatus used by the Example and the comparative example, and the measurement result.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the scope of the present invention is not limited thereto.

  FIG. 1 is a cross-sectional view showing an expansion / contraction flexible joint according to an embodiment of the present invention. The joint 3 extends from the front of the page to the back. The expansion / contraction flexible joint of the present invention is provided on a joint 3 between the structure 1 and the structure 2, and includes a flexible water blocking member 6, a pressing member 8, and a fixing member 9.

  The flexible water stop member 6 includes an expansion / contraction part 4 at an intermediate part, and a sheet-like adhesive part 5 at both ends (the structure 1 side and the structure 2 side) of the intermediate part. The flexible water stop member 6 can be made of a flexible material such as rubber. In FIG. 1, the stretchable portion 4 having a bellows structure is shown, but an elastic body, a folded structure, or the like can also be provided, and it has stretchability, flexibility, waterstop, and the like.

  The pressing member 8 includes a plate-like portion 7. The plate-like portion 7 supports the sheet-like adhesive portion 5 by applying pressure to the structure 1 and sandwiching it. In FIG. 1, as the pressing member 8, a groove-shaped member having side plates standing upright at both ends of the plate-like portion 7 on the joint 3 side and the far side of the joint 3 is shown. The channel member is preferably a lip channel member having a lip portion. Examples of the groove-shaped pressing member include a lip groove-shaped steel and a hat-shaped steel specified in JIS G 3350.

  The fixing member 9 is connected to the structure 1 and the presser member 8 to reduce the distance between the structure 1 and the presser member 8 to generate an axial force, and press the presser member 8 against the sheet-like attachment portion 5. In FIG. 1, as a fixing member 9, an intermediate part that forms an anchor bolt hole, a fixing part that is fixed to one end of the intermediate part against the groove-shaped member, and a base end that is applied to the structure 1 at the other end of the intermediate part A member having a portion, an anchor bolt, and a fixing member having a nut are shown.

  In addition, the sheet-like adhesive portion 5 of the flexible water-stopping member 6 includes an extending portion 10 that extends from a portion in contact with the plate-like portion 7 of the pressing member 8, and the pressing member of the extending portion 10 An upper surface ridge 11 is provided on the 8 side surface (upper surface of the paper surface), and a lower surface ridge 12 is provided on the surface (lower surface of the paper surface) of the extending portion 10 on the structure 1 side. The upper surface protrusion 11 prevents the flexible water stop member from being pulled out. Further, when the pressing member 8 is press-contacted to the sheet-like attachment part 5 by the fixing member 9, the lower surface protrusion 12 causes the flexible water-stopping member 6 (the sheet-like attachment part 5) to be on the holding member 8 side. Bend.

  FIG. 2 is a cross-sectional view of the expansion / contraction flexible joint according to an embodiment of the present invention before (a) and after (b) (the fixing member 9 is not shown). In the expansion / contraction flexible joint of FIG. 2, the flexible water-stopping member has the upper surface protrusion 11 on the surface of the extending portion 10 on the side of the holding member 8 and the lower surface protrusion on the surface of the opposite structure body 1 side. 12 is provided. In the state where the force in FIG. 2 (a) is not applied, the sheet-like fastening portion 5 and the extending portion 10 are linear.

  When the presser member 8 is pressed from the upper side to the lower side of the paper surface by a fixing member 9 (not shown) (in the direction of the arrow), the sheet-like adhesive portion 5 is sandwiched and fixed between the structure 1 and the plate-like portion 7. (FIG. 2 (b)). The flexible water-stopping member is pulled to the left side of the page when water pressure is applied or the structure 1 is displaced. Furthermore, depending on the material of the sheet-like adhesive portion 5, the thickness may be reduced by being pulled. On the other hand, in the expansion / contraction flexible joint of the present invention, the thickness of the extending portion 10 is larger than the gap between the plate-like portion 7 and the structure 1 due to the thickness of the upper surface protrusion 11 and the thickness of the lower surface protrusion 12. It is difficult to be pulled out by a physical barrier (FIG. 2B). In the expansion / contraction flexible joint of the present invention, when the pressing member 8 is pressed by a fixing member 9 (not shown) (in the direction of the arrow), the extending portion 10 is lifted and bent due to the presence of the lower surface protrusion 12. The frictional force between the flexible water-stopping member and the pressing member 8 can be increased by contacting the end portion or the side plate 13 of the plate-like portion 7, and the sheet-like bracing portion 5 is hardly pulled out (FIG. 2B). )). Moreover, the amount of the material of the flexible water stop member can be reduced.

  The position of the lower surface protrusion 12 will not be specifically limited if it exists in the structure side surface of the extension part 10. FIG. Further, the shape of the lower surface protrusion 12 is not particularly limited as long as the sheet-like adhesive portion 5 can be bent, and the cross section can be a square as shown in FIG. In this way, the cross section can be formed into a bowl shape. Furthermore, it can also arrange | position so that it may wrap from the edge part of the extension part 10 to the upper surface protrusion 11 side. The material of the lower surface protrusion 12 is not particularly limited, and can be the same quality as the extended portion 10, or can be integrally formed with the extended portion 10. Moreover, in order to bend the sheet-like adhesive part 5, it is preferable in itself that it is a material and an inelastic body which are not easily crushed by pressure.

  As shown in FIG. 1, the pressing member can be a groove-shaped member, but can also be in other forms. FIG. 3 shows another embodiment of the pressing member and the fixing member. The pressing member is a plate-like member 14 in which an anchor bolt hole is formed, and the fixing member is an anchor bolt and a nut embedded in the structure. is there. Further, FIG. 3 shows a sheet-like brazing portion provided with a water stop ridge 16 extending in a direction substantially parallel to the joint on the surface facing the structure of the sheet-like brazing portion. The waterstop ridge 16 is crushed to increase waterstop. The water stopping ridge 16 can be one or plural. The position of the water stopping ridge 16 (left and right direction on the paper surface) is not particularly limited, but the water stopping performance is improved by the pressure of the pressing member when it is between the plate-like portion of the pressing member and the structure.

  In the present invention, the presser member may be provided with a presser protrusion that protrudes toward the flexible water-stop member of the plate-like portion. In FIG. 4, side plates that are provided upright on both the joint side of the plate-like portion and the far side of the joint, each having a presser protrusion 15 that protrudes in the direction of the flexible water-stopping member (the lower side of the paper) as the presser member 8. A channel member with 13 is shown. FIG. 4A is before fixing, and FIG. 4B is after fixing. The presser protrusion 15 can be welded to the presser member 8 or can be integrally formed. When the pressing member 8 is pressed from the upper side to the lower side (in the direction of the arrow) with the fixing member 9 (not shown), the pressing ridge 15 bites into and presses the sheet-like attachment portion 5, and the sheet-like attachment portion 5. And the frictional force of the presser member 8 is increased. In this way, the sheet-like bracing portion 5 is less likely to be pulled out than when the presser protrusion 15 is not present (FIG. 4B). Furthermore, since the gap between the presser protrusion 15 and the structure 1 can be reduced, it becomes a barrier between the extending portion 10 and the upper surface protrusion 11, and the sheet-like bracing portion 5 is hardly pulled out. In addition, the presser protrusion 15 increases the rigidity of the presser member 8 and prevents leakage due to distortion.

  FIG. 5 is a cross-sectional view of various aspects of the channel member of the expansion / contraction flexible joint according to the present invention. (A) does not include a pressing ridge protruding in the direction of the flexible water-stopping member. (B) is one in which round steel is welded to one end (bent part) of the plate-like portion of the holding member, and (c) is one in which round steel is welded to both ends of the plate-like portion of the holding member. (D) is one round steel welded to the surface (bottom surface) of the plate-like part of the presser member, and (e) is two round steels welded to the surface of the plate-like part of the presser member. (F) is obtained by welding flat steel to one side surface of the holding member, and (g) is obtained by welding flat steel to both side surfaces of the holding member. (H) shows one flat steel welded to the surface of the plate-like portion of the presser member, and (i) shows two flat steels welded to the surface of the plate-like portion of the presser member. (J) shows one square steel welded to the surface of the plate-like portion of the holding member, and (k) shows two square steels welded to the surface of the plate-like portion of the holding member.

  Moreover, in the expansion-contraction flexible joint of this invention, the plate-shaped member in which the anchor bolt hole was formed can be used as a pressing member as mentioned above. In this case, the fixing member can be a plurality of anchor bolts and nuts embedded in the structure. As the plate member, flat steel or the like can be used. Moreover, there are usually a plurality of anchor bolt holes, and the pitch can be adjusted as appropriate. FIG. 6 is a cross-sectional view of various aspects of the plate-like member. A broken line in the center indicates an anchor bolt hole. (A) does not include a pressing ridge protruding in the direction of the flexible water-stopping member. (B) is obtained by welding flat steel to the side surface of the pressing member. (C) is obtained by welding one flat bar to the surface of the plate-like portion of the pressing member. (D) is obtained by welding square steel to the surface of the plate-like portion of the pressing member. (E) is obtained by welding round steel to the surface of the plate-like portion of the pressing member. (F) is one in which one end of the presser member is an arc and the other end of the presser member is integrated with the presser protrusion. In (g), square steel is provided on the surface of the plate-like portion of the pressing member, and a concave portion is provided on the surface of the plate-like portion so as to be fitted with the square steel and is not welded. (H) is an exploded view thereof. The square steel can be welded to the holding member. In (i), round steel is provided on the surface of the plate-like portion of the pressing member, and a concave portion is provided on the surface of the plate-like portion so as to be fitted with the round steel and is not welded. (J) is an exploded view thereof. The round steel can also be welded to the holding member.

  When the holding member is a plate-like member in which anchor bolt holes are formed, the anchor bolt holes are usually arranged at a predetermined interval. The anchor bolt hole and the intermediate portion of the anchor bolt hole that are separated from each other are pulled and may be pulled out or deformed. However, by providing the above-described presser protrusion, local deformation and disconnection can be prevented. In this case, the presser ridge may be intermittent without being continuous in the direction parallel to the joint, and may be provided only in a portion other than the portion where the fixing force by the anchor bolt is involved.

  The expansion-contraction flexible joint of the present invention can further include a reinforcing sheet that covers one side or both sides of the flexible water-stopping member. Examples of the reinforcing sheet include a reinforcing cloth and a rubber cover. As shown in FIG. 7, the reinforcing sheet 17 can be installed between the presser member 8 and the sheet-like fastening portion 5 of the flexible water-stopping member (FIG. 7A). The reinforcing sheet 17 is narrowly pressed by the sheet-like ridge portion 5 of the flexible water-stopping member and the pressing member 8 (FIG. 2B). Since the reinforcing sheet 17 is only sandwiched and fixed, when the flexible water-stopping member expands due to water pressure or the like, the reinforcing sheet 17 also expands in a follow-up manner, and tension acts on the sheet-like fastening portion 5. Therefore, the reinforcing sheet 17 may be pulled out. Therefore, it is preferable to use the reinforcing sheet 17 in which the end portion of the reinforcing sheet 17 is further extended from the pressing member 8 as the reinforcing sheet 17 (FIG. 7A). By using such a reinforcing sheet 17, it becomes difficult to be pulled out by being pinched by the end portion or the side plate 13 of the pressing member 8 and the extending portion 10 or the upper surface protrusion 11 of the sheet-like fastening portion 5. Further, as shown in FIG. 8, when the presser member 8 provided with the presser protrusion 15 is used, the presser protrusion 15 makes it difficult for the reinforcing sheet 17 to be pulled out. In particular, when flat steel is welded to one side surface of the pressing member 8, the structure is such that the sheet-like bracing portion 5 is crushed by the pressing protrusion 15, so that a structure in which the reinforcing sheet 17 is wound is formed. . Since the reinforcing sheet 17 is entrained, the reinforcing sheet 17 can be fixed by the presser protrusion 15, and the entrained reinforcing sheet 17 is sandwiched between the end of the presser member 8 or the side plate 13 and the upper surface protrusion 11. As a result, the fixing force of the reinforcing sheet 17 and the like is further improved.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and can be appropriately changed without departing from the spirit thereof.

(Example)
Below, the result of having tested the difficulty of pulling out the various aspects of the expansion-contraction flexible joint of this invention is shown.
(Comparative Example 1)
FIG. 9 shows a schematic diagram of the test apparatus. A flexible water-stopping member comprising an expansion / contraction part (not shown), a sheet-like attachment part 5, an extension part 10, an upper surface protrusion 11, and a water stop protrusion 16, and a presser member 8 that is a channel-shaped member; An intermediate part that forms an anchor bolt hole, a fixing part that is fixed to one end of the intermediate part against a channel member, and a base end part that is applied to the structure 1 at the other end of the intermediate part. The expansion member of the expansion / contraction flexible joint including the anchor member and the fixing member 9 including the embedded anchor bolt and the nut and the reinforcing sheet 17 is cut between the expansion / contraction portion and the sheet-like attachment portion 5, and one end of the reinforcement sheet 17 is used as a tension device. A test apparatus was installed. The reinforcing sheet 17 was disposed so as to extend further than the portion pressed by the pressing member 8. The reinforcing sheet 17 was pulled (in the direction of the arrow in FIG. 9), and the pull-out load was measured. The load was measured when a factor that greatly affected the performance of the expansion / contraction flexible joint occurred, such as dropping of the flexible water-stopping member or breaking of the presser member 8. FIG. 10 is a schematic view of a flexible water-stopping member and a presser member of the test apparatus used in Examples and Comparative Examples.

Example 1
The pull-out load was measured in the same manner as in Comparative Example 1 except that the holding member was a flat plate welded to a side plate opposite to the joint of the channel member. Along with the schematic diagram of the apparatus, the pull-out load per unit length with Comparative Example 1 as 1 is shown in FIG.

(Example 2)
The pull-out load was measured in the same manner as in Comparative Example 1 except that a flexible water-stopping member having a lower surface protrusion was used. Along with the schematic diagram of the apparatus, the pull-out load per unit length with Comparative Example 1 as 1 is shown in FIG.

Example 3
Except for using a presser ridge that welds flat steel to the side plate opposite to the joint of the channel-shaped member as the presser member, and a flexible waterstop member that has a lower ridge. The pull-out load was measured in the same manner as in Comparative Example 1. Along with the schematic diagram of the apparatus, the pull-out load per unit length with Comparative Example 1 as 1 is shown in FIG.

  When the maximum extraction load of Comparative Example 1 is 1, the maximum extraction load of Example 1 is 1.40, and the maximum extraction load of Example 2 is 1.42, which improves the fixing force. In Example 3, the maximum drawing load was 1.54, and the fixing force was most improved. In addition, the said test result is the median of the result implemented in multiple times on the same conditions.

DESCRIPTION OF SYMBOLS 1, 2 Structure 3 Joint 4 Expansion-contraction part 5 Sheet-like attachment part 6 Flexible water stop member 7 Plate-like part 8 Holding member 9 Fixing member 10 Extension part 11 Upper surface protrusion 12 Lower surface protrusion 13 Side plate 14 Plate shape Member 15 Presser ridge 16 Water stop ridge 17 Reinforcement sheet

Claims (6)

A flexible water-stopping member that is erected on the joint between the structures, and has a stretchable part in the middle part, and a sheet-like fastening part at both ends of the middle part,
A pressing member provided with a plate-like portion that supports the sheet-like attachment portion by applying pressure to the structure body; and
A fixing member that is connected to the structure and the pressing member to reduce the distance between the structure and the pressing member to generate an axial force, and press-contacts the pressing member to the sheet-like attachment portion;
The sheet-like adhesive portion includes an extending portion extending from a portion in contact with the plate-like portion;
The extending portion includes an upper surface protrusion that prevents the flexible water-stopping member from being pulled out on the surface on the pressing member side, and the sheet-like attachment of the pressing member with the fixing member on the surface on the structure side Provided with a lower surface ridge that bends the flexible water-stopping member toward the presser member when being pressed against the portion;
An expansion / contraction flexible joint characterized by the above. The pressing member is a plate-like member in which an anchor bolt hole is formed, and includes a pressing ridge protruding in the direction of the flexible water-stopping member,
The expansion / contraction flexible joint according to claim 1, wherein the fixing member includes an anchor bolt and a nut embedded in the structure. A flexible water-stopping member that is erected on the joint between the structures, and has a stretchable part in the middle part, and a sheet-like fastening part at both ends of the middle part,
A pressing member provided with a plate-like portion that supports the sheet-like attachment portion by applying pressure to the structure body; and
A fixing member that is connected to the structure and the pressing member to reduce the distance between the structure and the pressing member to generate an axial force, and press-contacts the pressing member to the sheet-like attachment portion;
The sheet-like adhesive portion includes an extending portion extending from a portion in contact with the plate-like portion;
The extending portion is provided with an upper surface protrusion that prevents the flexible water-stopping member from being pulled out on the surface on the pressing member side,
The pressing member is a groove-shaped member provided with side plates standing upright on both ends of the plate-like portion on the joint side and the distant side of the joint, and includes a pressing protrusion protruding in the direction of the flexible water-stopping member,
The fixing member includes an intermediate part that forms an anchor bolt hole, a fixing part that is fixed to one end of the intermediate part against the channel member, and a base end part that is applied to the structure at the other end of the intermediate part. A member, an anchor bolt embedded in the structure, and a nut;
An expansion / contraction flexible joint characterized by the above.   The extending portion further protrudes from a lower surface that bends the flexible water blocking member toward the pressing member when the pressing member is pressed against the sheet-like attachment portion with the fixing member on the surface on the structure side. The expansion / contraction flexible joint according to claim 3, comprising a strip.   A reinforcing sheet that covers a surface of the flexible waterproofing member opposite to the structure, the reinforcing sheet being further compressed by the flexible waterproofing member and the pressing member, and an end portion further from the pressing member; The expansion-contraction flexible joint of any one of Claims 1-4 arrange | positioned so that it may extend.   The sheet-like brazing portion includes a water stopping ridge that extends in a direction substantially parallel to the joint, being crushed on the surface facing the structure of the sheet-like brazing portion to increase water stopping. The expansion-contraction flexible joint of any one of claim | item 1 -5.

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