JP6275661B2 - Flexible joint and mounting method of flexible joint - Google Patents

Description

  The present invention relates to a flexible joint provided at a connecting portion between an existing manhole and a pipe member, for example, and a method for attaching the flexible joint.

  For example, a sewerage pipe facility is mainly composed of a manhole and a sewer main, and the end of the sewer main is fixed to the wall of the manhole and communicates with the inside of the manhole. In such sewerage facilities, manholes and sewer mains may be displaced relative to each other in the event of an earthquake, so it is devised to provide a structure to allow relative displacement at the connection between manholes and sewer mains. (For example, see Patent Documents 1 to 3).

  In Patent Document 1, a lining pipe is disposed inside an existing pipe, and an end of the existing pipe is cut to form a space outside the lining pipe, and then a cylindrical elastic water-stop tubular portion is inserted into the space. Like to do. On the inner surface of the elastic water-stop tubular portion, an annular concave portion and a convex portion are continuously formed in the axial direction. The inner surface of the elastic water-stop tubular portion is in pressure contact with the outer surface of the lining pipe. When an earthquake occurs, the elastic waterstop tubular portion is elastically deformed to allow relative displacement between the manhole and the existing pipe.

  Moreover, in patent document 2, the renovation pipe | tube is provided inside the existing pipe | tube, the edge part of this renovation pipe | tube is protruded in a manhole, and the tubular flexible water stop material is attached to the edge part of a renovation pipe | tube. One end portion of the flexible water-stopping material is fixed to the outer peripheral surface of the end portion of the rehabilitation pipe, and the other end portion is fixed to the inner wall surface of the manhole. When an earthquake occurs, the flexible material is elastically deformed to allow relative displacement between the manhole and the existing pipe.

  Moreover, in patent document 3, after cutting the edge part of an existing pipe, a renovated pipe is provided inside the existing pipe, and a seismic joint is pushed into a space formed outside the end part of the existing pipe. Yes. The earthquake-resistant joint includes a small-diameter cylindrical portion that is substantially equal to the outer diameter of the rehabilitated pipe, a large-diameter cylindrical portion that is substantially equal to the inner diameter of the space, and a connection portion that connects the ends of the small-diameter cylindrical portion and the large-diameter cylindrical portion. The small-diameter cylindrical portion is fixed to the end portion of the rehabilitation pipe, and the large-diameter cylindrical portion is fixed to the manhole. When an earthquake occurs, the seismic joint is elastically deformed to allow relative displacement between the manhole and the existing pipe.

JP 2009-138434 A JP 2010-255205 A JP 2011-241617 A

  By the way, depending on the magnitude of the earthquake, the relative displacement between the manhole and the sewer main may become large, and the sewer main may be displaced greatly in the axial direction. In this case, in Patent Document 1, since the cylindrical elastic water-stop tubular portion is merely pressed against the outer surface of the lining pipe, if an attempt is made to follow a large axial displacement, the axial direction of the elastic water-stop tubular portion is reduced. Long dimensions must be secured. If the axial dimension of the elastic water blocking tubular part is long, if the wall thickness of the elastic water blocking tubular part is thin like some assembled manholes, it cannot be accommodated in the wall part of the manhole, most of which It protrudes into the manhole, and there is a problem that the protruding portion becomes an obstacle to the flow of sewage, and it is liable to cause damage and deterioration of the elastic water-stop tubular portion.

  Moreover, in patent document 2, since it is trying to attach a flexible water stop material to the rehabilitation pipe | tube which protruded in the manhole, while the flexible water stop material becomes a sewage flow obstruction, there is a problem that it is easy to break or deteriorate. is there.

  Furthermore, in Patent Document 3, since the small-diameter cylindrical portion of the earthquake-resistant joint is fixed to the end portion of the rehabilitation pipe and the large-diameter cylindrical portion is fixed to the manhole, the axial displacement of the sewer main is substantially Only the deformation of the connecting portion between the small diameter cylindrical portion and the large diameter cylindrical portion and the vicinity thereof can be allowed, and it is difficult to cope with the large displacement.

  In other words, various structures have been devised as disclosed in Patent Documents 1 to 3 as a structure for allowing the relative displacement of the connecting portion between the manhole and the sewer main. It is considered that it is not possible to satisfy both the response to the large axial displacement of the main pipe, the prevention of the flow-down obstacle, and the prevention of breakage and deterioration of the water stop material.

  The present invention has been made in view of such a point, and the object of the present invention is to allow a large displacement in the axial direction of the pipe member at the time of the occurrence of an earthquake and to cause a flow failure while maintaining a water stop. In addition, it is an object of the present invention to provide a flexible joint that is not easily damaged or deteriorated and a method for attaching the flexible joint.

  In order to achieve the above object, in the present invention, a flexible member is provided with a folded portion so that a large displacement of the tube member can be allowed while maintaining a size that can be accommodated in the wall of the manhole.

The first invention is
In the flexible joint provided at the connection part of the pipe member connected to the manhole in a state inserted in the wall of the manhole,
The flexible joint has an outer cylinder member fixed to the wall in a state of being accommodated in the wall in which the pipe member in the manhole is inserted, and flexibility disposed in the outer cylinder member. A flexible member made of a waterstop material having,
The flexible member is formed so as to extend along the inner surface of the outer cylinder member and is fixed to the inner surface, and is formed so as to extend along the outer surface of the tube member. An inner fixed tube portion to be fixed, and a folded portion folded between the outer fixed tube portion and the inner fixed tube portion,
Inside the manhole in the outer cylinder member, a bulge restraining portion that suppresses the bulging portion of the flexible member from bulging into the manhole is provided so as to protrude radially inward. It is characterized by.

  According to this structure, while the outer side fixed cylinder part of a flexible member is fixed to the wall of a manhole via an outer cylinder member, the inner side fixed cylinder part of a flexible member is fixed to a pipe member. Assuming that the tube member is displaced in the axial direction with respect to the manhole in this fixed state, for example, there is a folded portion between the outer fixed cylindrical portion and the inner fixed cylindrical portion of the flexible member. A large amount of axial displacement of the pipe member is ensured by deforming in the direction in which the pipe member moves. Since the folded portion is between the outer fixed cylindrical portion and the inner fixed cylindrical portion, the dimension of the flexible member in the axial direction may be short. Therefore, since the whole or most of the flexible member can be accommodated in the wall of the manhole, there is no obstacle to the flow, and damage and deterioration are also suppressed.

  Further, for example, when the water pressure acts on the flexible member from the outside, it can be considered that the folded portion is deformed so as to bulge into the manhole. In the present invention, the outer cylinder fixed to the wall of the manhole The member is provided with a bulge restraining part, and the bulge restraining part suppresses the bulging of the folded back part, so that it is difficult for a flow-down trouble to occur over a long period of time, and the damage and deterioration of the flexible member are also restrained. Is done.

According to a second invention, in the first invention,
The flexible joint has an expansion member for pressing and fixing the outer fixed cylinder portion of the flexible member to the inner surface of the outer cylinder member, and the expansion member engages with the outer cylinder member. An engaging portion is provided.

  According to this configuration, by expanding the expansion member, the outer fixed cylindrical portion of the flexible member is pressed against and fixed to the inner surface of the outer cylindrical member. And since the engaging part of an expansion member is engaging with the outer cylinder member, when a hydraulic pressure acts, the position shift of a flexible member is suppressed.

According to a third invention, in the first or second invention,
A part of the bulge suppressing part is provided with a notch part, and a closing member for closing the notch part is detachably attached to the outer cylinder member.

  According to this configuration, when the flexible joint is attached, the notch portion is opened by removing the closing member from the outer cylinder member, so that a tool or the like is placed inside the outer cylinder member via the notch portion. The flexible member can be easily fixed by being inserted. After the work, the closing member is attached to the outer cylinder member and the cutout portion is closed to prevent the folded portion of the flexible member from bulging into the manhole.

According to a fourth invention, in any one of the first to third inventions,
The flexible joint has an expansion member for pressing and fixing the outer fixed cylindrical portion of the flexible member to the inner surface of the outer cylindrical member, and the expansion member acts on the expansion member. An attachment portion for detachably attaching a connector for connecting the expansion means to be attached is provided.

  According to this configuration, when the outer fixed cylinder portion of the flexible member is fixed to the outer cylinder member by the expansion member, the coupling tool is attached to the expansion member, and the expansion means is attached to the expansion member via the coupling tool. Connect and apply an expansion force to the expansion member. And after fixing, by removing a connection tool from the attachment part of an expansion member, a flexible joint will become compact and the thickness of radial direction will become thin by the part which does not have a connection tool. Accordingly, the diameter of the recess formed in the manhole wall to accommodate the flexible joint is reduced, the depth of the recess is reduced, and the workability of forming the recess in the manhole wall is improved. Moreover, even if the thickness of the flexible joint in the radial direction is reduced, interference with the pipe member is prevented.

The fifth invention is:
In the mounting method of the flexible joint provided in the connection part of the existing pipe connected to the manhole in a state inserted in the wall of the manhole,
After forming a rehabilitation pipe on the existing pipe, a step of cutting a connecting portion between the manhole and the existing pipe from the inside of the manhole to form a recess for accommodating the flexible joint;
The concave joint formed in the wall of the manhole accommodates the flexible joint provided with an outer cylinder member and a flexible member made of a water-stopping material having flexibility disposed inside the outer cylinder member. Fixing the outer cylinder member to the wall of the manhole;
Fixing the outer fixed cylindrical portion of the flexible member to the inner surface of the outer cylindrical member;
Fixing the inner fixed cylinder part of the flexible member to the outer surface of the rehabilitation pipe;
A folded portion that is folded between the outer fixed cylinder portion and the inner fixed cylinder portion is provided, and the folded portion of the flexible member swells into the manhole inside the manhole in the outer cylinder member. And a step of providing a bulge suppressing portion that suppresses the protrusion.

  According to this configuration, the flexible joint is attached after the renovated pipe is formed on the existing pipe. And since there is a folded portion between the outer fixed cylinder part and the inner fixed cylinder part of the flexible member, a large amount of axial displacement of the existing pipe and the rehabilitated pipe is ensured, and the axial direction of the flexible member Short dimensions. Therefore, since the whole or most of the flexible member can be accommodated in the wall of the manhole, there is no hindrance to the flow, and damage and deterioration of the flexible member are suppressed. Further, for example, when the water pressure is applied to the flexible member from the outside, the bulge suppressing portion suppresses the bulging of the folded portion, so that it becomes difficult for the flow-out trouble to occur over a long period of time and the flexible portion. Damage and deterioration of the member are also suppressed.

The sixth invention is:
In the mounting method of the flexible joint provided in the connection part of the existing pipe connected to the manhole in a state inserted in the wall of the manhole,
After forming a recess for accommodating the flexible joint by cutting a connection portion between the manhole and the existing pipe from the inside of the manhole, a step of producing a renovated pipe on the existing pipe;
The concave joint formed in the wall of the manhole accommodates the flexible joint provided with an outer cylinder member and a flexible member made of a water-stopping material having flexibility disposed inside the outer cylinder member. Fixing the outer cylinder member to the wall of the manhole;
Fixing the outer fixed cylindrical portion of the flexible member to the inner surface of the outer cylindrical member;
While fixing the inner side fixed cylinder part of the said flexible member to the outer surface of the said rehabilitation pipe | tube, the folding | returning part turned back between the said outer side fixed cylinder part and the said inner side fixed cylinder part is provided, In the said outer cylinder member And a step of providing a bulging suppressing portion for suppressing the folding portion of the flexible member from bulging into the manhole inside the manhole.

  According to this structure, after forming the recessed part for accommodating a flexible joint, a renovated pipe can be manufactured to an existing pipe. As in the fifth aspect, the axial displacement of the existing pipe and the rehabilitated pipe is ensured to be large, and the flexible member does not become an obstacle to the flow, and the flexible member is not damaged or deteriorated. It is suppressed. In addition, for example, when the water pressure acts on the flexible member from the outside, the bulging of the folded portion is suppressed, so that it is difficult for flow failure to occur over a long period of time, and the flexible member is also damaged or deteriorated. It is suppressed.

  According to the first aspect of the present invention, the flexible member is disposed inside the outer cylindrical member that is fixed while being accommodated in the wall of the manhole, and the flexible member is an outer side fixed to the inner surface of the outer cylindrical member. It has a fixed cylinder part, an inner fixed cylinder part fixed to the outer surface of the tube member, and a folded part folded back between the outer fixed cylinder part and the inner fixed cylinder part, and the folded part of the flexible member Is suppressed by the outer cylinder member. Thereby, it is possible to provide a flexible joint that is not easily damaged or deteriorated without causing a flow-down failure while allowing a large displacement in the axial direction of the pipe member at the time of the occurrence of an earthquake and maintaining a water-stopping property.

  According to the second aspect of the present invention, since the expansion member for pressing and fixing the outer fixed cylindrical portion of the flexible member to the inner surface of the outer cylindrical member is provided with the engaging portion that engages with the outer cylindrical member, the hydraulic pressure is increased. When acted, the displacement of the flexible member can be suppressed.

  According to the third aspect of the invention, the notch portion is provided in a part of the bulge suppressing portion, and the closing member that closes the notch portion is detachably attached to the outer cylinder member, so that the flexible member can be easily fixed. It can be carried out.

  According to the fourth invention, since the connector for connecting the expansion means can be detachably attached to the expansion member, the flexible joint can be made compact and the thickness in the radial direction can be reduced. Thereby, the diameter of the recess formed in the wall of the manhole to accommodate the flexible joint can be reduced, the depth of the recess can be reduced, and workability can be improved. Moreover, even if the thickness of the flexible joint in the radial direction is reduced, interference with the pipe member can be prevented.

  According to the fifth and sixth inventions, a flexible joint can be provided when a rehabilitation pipe is manufactured and repaired on an existing pipe. The flexible joint allows a large displacement in the axial direction of the pipe member in the event of an earthquake and maintains water-stopping, without causing a flow-through obstruction and making the flexible joint difficult to break or deteriorate. be able to.

It is sectional drawing of the manhole and the rehabilitation pipe | tube with which the flexible joint which concerns on embodiment was attached. It is the figure which looked at the flexible joint from the manhole inner side. It is a perspective view of an outer cylinder member. It is the figure which looked at the flexible joint of the state which removed the obstruction | occlusion member from the manhole inner side. It is the figure which looked at the expansion band from the manhole outer side. It is an enlarged view of the separation part vicinity of an expansion band. FIG. 7 is a view corresponding to FIG. 6 in a state in which a connector is attached to the extension band. FIG. 7 is a view corresponding to FIG. 6 in a state where the extension band is extended. FIG. 7 is a view corresponding to FIG. 6 in a state in which a connector is removed from the expanded band after expansion. It is sectional drawing of the manhole before attaching a flexible joint. It is FIG. 10 equivalent view which shows the state which cut the end part of the manhole and the existing pipe. It is FIG. 10 equivalent view which shows the state which manufactured the rehabilitation pipe | tube. FIG. 11 is a view corresponding to FIG. 10 showing a state in which the flexible joint is disposed in the recess. It is an enlarged view of a flexible joint which shows the case where water pressure acts from the outside. It is FIG. 10 equivalent view which shows the state which manufactured the renovated pipe before cutting a manhole and an existing pipe. FIG. 11 is a view corresponding to FIG. 10 showing a state where a manhole and an existing pipe are cut after the rehabilitated pipe is manufactured. FIG. 4 is a view corresponding to FIG. 3 according to a modification of the embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.

  FIG. 1 is a cross-sectional view of a manhole 100, an existing pipe 101, and a rehabilitation pipe 102 to which a flexible joint 1 according to an embodiment of the present invention is attached. The manhole 100, the existing pipe 101 and the renovated pipe 102 constitute a sewerage pipe facility. The wall 104 of the manhole 100 is made of concrete and is formed in a cylindrical shape extending in the vertical direction. The existing pipe 101 is a sewer main, and is composed of a concrete circular pipe member extending in a substantially horizontal direction. The existing pipe 101 may be damaged due to aging, etc., or cracking and corrosion may occur, resulting in a decrease in load carrying capacity and flow capacity. In this case, the renovated pipe 102 is piped inside the existing pipe 101 for repair. In this case, the existing pipe 101 and the renovated pipe 102 constitute a sewer main.

  As the pipe making method of the rehabilitation pipe 102, there are mainly a self-supporting pipe and a composite pipe. The rehabilitation pipe 102 of this embodiment is a self-supporting pipe. The forming method of the self-supporting pipe is roughly divided into thermosetting, photocuring, and thermoforming, and there are an inversion method and a forming method as construction methods, and the rehabilitated tube 102 may be formed by any method. The materials used for the rehabilitation tube 102 include unsaturated polyester resin, epoxy resin, vinyl ester resin, hard vinyl chloride resin, high-density polyethylene resin, etc. When using materials other than hard vinyl chloride resin and high-density polyethylene resin For this, a nonwoven fabric impregnated with a thermosetting resin is also used. It is also possible to manufacture the rehabilitated tube 102 using a material reinforced by weaving glass fibers into a resin material.

  Although details will be described later, the end portion of the rehabilitating pipe 102 is formed so as to protrude more into the manhole 100 than the end portion of the existing pipe 101 when compared with the end part of the existing pipe 101. The end portion of the rehabilitation pipe 102 is disposed so as to be flush with the inner surface of the wall 104 of the manhole 100 or slightly outside the inner surface of the wall 104.

  The end of the rehabilitation pipe 102 is connected so as to communicate with the inside of the manhole 100 while being inserted into the wall 104 of the manhole 100. The flexible joint 1 is provided at a connection portion of the rehabilitation pipe 102 and allows relative displacement between the manhole 100, the existing pipe 101 and the rehabilitation pipe 102 while ensuring water-stopping between the rehabilitation pipe 102 and the manhole 100. Is to do. The relative displacement between the manhole 100 and the existing pipe 101 and the rehabilitated pipe 102 occurs, for example, when an earthquake occurs, and the amount of axial displacement of the existing pipe 101 and the rehabilitated pipe 102 is particularly large.

  The flexible joint 1 includes an outer cylinder member 10, a flexible member 20, an expansion band (expansion member) 30, and fastening bands 40 and 40. There may be one fastening band 40. The outer cylinder member 1 is fixed to the wall 104 in a state in which the outer cylinder member 1 is accommodated in the wall 104 (the portion between the inner surface and the outer surface of the wall 104) in which the rehabilitation pipe 102 in the manhole 100 is inserted. As shown in FIGS. 2 and 3, the outer cylinder member 10 includes a cylindrical portion 11 and an end plate portion (a bulge suppressing portion) 12. The cylindrical portion 11 and the end plate portion 12 are made of a material having high strength such as a stainless steel plate, but are not limited thereto, and for example, a material such as rust-proof plated steel, hard plastic, or fiber reinforced plastic is used alone. It is also possible to use a composite material that is an arbitrary combination of these materials.

  The cylindrical part 11 has an inner diameter larger than the outer diameter of the existing pipe 101 and is disposed so as to surround the end part of the rehabilitated pipe 102. The inner diameter of the cylindrical portion 11 is set so that a space in which the flexible member 20 can be disposed between the inner surface of the cylindrical portion 11 and the outer surface of the end portion of the existing tube 101 can be formed. The diameter is set to be sufficiently larger than the outer diameter. The axial dimension of the cylindrical portion 11 is set to be shorter than the thickness dimension of the wall 104 of the manhole 100. An open part 11 a is provided on the upper part of the cylindrical part 11. The open part 11 a is formed by cutting out a part of the cylindrical part 11. If the dimension in the axial direction of the cylindrical part 11 in the open part 11a is long, the water stoppage may be lowered. Therefore, the dimension in the axial direction of the cylindrical part 11 in the open part 11a is 1 of the dimension in the axial direction of the cylindrical part 11. It is preferable to set it to / 2 or less.

  The end plate portion 12 is provided so as to protrude radially inward from an edge portion on one side in the axial direction of the cylindrical portion 11. One side in the axial direction in the cylindrical portion 11 is the left side shown in FIG. 1, that is, the inside of the manhole 100. Although details will be described later, the end plate portion 12 is a portion for suppressing the folded portion 23 of the flexible member 20 from bulging into the manhole 100 due to external water pressure, and is strong against the cylindrical portion 11. It is fixed to. As shown in FIG. 1, in the mounted state, the radially inner edge portion of the end plate portion 12 is separated radially outward from the outer surface of the end portion of the rehabilitated tube 102, and the inner edge portion of the end plate portion 12 and the rehabilitated tube A gap is formed between the outer surface of the end portion of 102. The clearance dimension a is set so that when the manhole 100 and the rehabilitation pipe 102 are relatively displaced at the time of the occurrence of the earthquake, the rehabilitation pipe 102 does not come into contact with the end plate portion 12 and inhibit the movement of the rehabilitation pipe 102. Specifically, it is preferable that the rehabilitation tube 102 is set so that the end of the rehabilitation tube 102 does not contact the end plate portion 12 when the axis is inclined by about 5 ° from the state shown in FIG.

  The dimension a is preferably set to be not more than three times the thickness of the member constituting the flexible member 20. Thus, for example, when the flexible member 20 is about to bulge into the manhole 100 due to external water pressure, the gap between the inner edge portion of the end plate portion 12 and the outer surface of the end portion of the rehabilitation pipe 102 is increased in the manhole 100. It is effectively suppressed from bulging out. The dimension a can be changed depending on the material, shape, thickness, and the like of the flexible member 20.

  As shown in FIG. 3, a cutout portion 12 a is provided on the upper portion of the end plate portion 12. This notch portion 12a constitutes a tool insertion portion for allowing the fastening tools of the fastening bands 40, 40 to be easily inserted into the cylindrical portion 12 by opening the upper portion of the end plate portion 12 to the inside of the manhole 100. doing. The width of the notch portion 12a is not limited as long as the fastening tool can be inserted. In this embodiment, the width of the notch portion 12a and the opening portion 11a is set to be the same as the width of the opening portion 11a of the cylindrical portion 11. It tries to be connected. The width of the notch 12a is preferably wide in consideration of workability when using a fastening tool. However, when the width becomes wide, the end plate 12 is easily deformed when subjected to water pressure. 1/4 or less of the circumference is preferable.

  Further, insertion holes 12b and 12b through which the fastening members 14 shown in FIG. 2 are inserted are formed in the vicinity of both edge portions of the notch portion 12a in the end plate portion 12, respectively.

  The flexible joint 1 includes a closing member 13 for closing the notch 12a. The closing member 13 is made of a steel plate or the like similarly to the outer cylinder member 10, and includes a vertical plate portion (a bulge suppressing portion) 13a that closes the notch portion 12a, and an arc plate portion 13b that closes the open portion 11a. Have. The arc plate portion 13b is curved in an arc shape along the upper surface of the cylindrical portion 11, and can cover the open portion 11a from above.

  The vertical plate portion 13 a extends downward from the edge portion of the arc plate portion 13 b, and the lower edge portion extends so as to be continuous with the radially inner edge portion of the end plate portion 12. Similar to the end plate portion 12, the vertical plate portion 13 a is for suppressing the flexible member 20 from bulging into the manhole 100 and extends along the end plate portion 12. The width | variety of the vertical board part 13a is longer than the width | variety of the notch part 12a. Insertion holes 13c and 13c through which the fastening member 14 is inserted are formed in the vicinity of both ends of the vertical plate portion 13a. The insertion holes 13c and 13c of the vertical plate portion 13a and the insertion holes 12b and 12b of the end plate portion 12 are formed. Is in agreement.

  Then, the closing member 13 is detachably attached to the outer cylinder member 10 by inserting the fastening member 14 through the insertion holes 13c and 13c of the vertical plate portion 13a and the insertion holes 12b and 12b of the end plate portion 12. The fastening member 14 can be composed of, for example, a bolt and a nut, and after the dimensioned bolt is welded to the end plate part 12 and the dimensioned bolt is inserted into the insertion holes 13c and 13c of the vertical plate part 13a. It is also possible to fasten the nut by screwing it onto the dimensioning bolt. The method of detachably fixing is not limited to the method described above, and any method can be used as long as a fastening operation can be performed at a construction site using a tool or the like.

  The flexible member 20 is made of a water-stopping material having flexibility and elasticity. Examples of the material include synthetic rubber such as styrene / butadiene rubber, EPDM and chloroprene rubber, natural rubber, soft vinyl chloride resin, heat It can be selected from the group consisting of plastic elastomers and the like. As shown in FIG. 1, the flexible member 20 has a substantially S-shaped cross section. That is, the flexible member 20 is formed so as to extend along the inner surface of the outer cylinder member 10, and is formed so as to extend along the outer surface of the rehabilitating tube 102 and the outer fixed cylinder portion 21 fixed to the inner surface. It has the inner side fixed cylinder part 22 fixed to this outer surface, and the folding | returning part 23 return | folded between the outer side fixed cylinder part 21 and the inner side fixed cylinder part 22. FIG.

  An outer end protruding portion 21 a that protrudes radially inward is formed at the outer end portion in the axial direction of the outer fixed cylinder portion 21. An inner end protruding portion 21 b that protrudes inward in the radial direction is formed at the inner end portion in the axial direction of the outer fixed cylinder portion 21. Further, the inner fixed cylindrical portion 22 is formed with a first protruding portion 22a and a second protruding portion 22b protruding outward in the radial direction and spaced apart from each other in the axial direction.

  The folded portion 23 extends from the outer fixed cylindrical portion 21 along the inner surface of the outer cylindrical member 10 toward the inside of the manhole 100, then extends radially inward and outward of the manhole 100, and then rehabilitates. It extends toward the inside of the manhole 100 along the outer surface of the tube 102. By forming the folded portion 23 in this manner, for example, when the rehabilitating tube 102 is about to be displaced relative to the inside / outside direction of the manhole 100 (the axial direction of the rehabilitating tube 102), the folded portion 23 is deformed so as to expand. A large amount of displacement is secured. Therefore, it is possible to cope with a large displacement in the axial direction of the rehabilitation pipe 102 by developing the folded portion 23 while shortening the dimension in the axial direction of the flexible member 20. The large displacement is, for example, a displacement in which the rehabilitation pipe 102 is pulled by 80 mm from the manhole 100 in a state where the rehabilitation pipe 102 is inclined by 5 ° with respect to the horizontal plane, or 40 mm is pushed into the manhole 100 in a state where the rehabilitation pipe 102 is inclined by 1 ° with respect to the horizontal plane Displacement.

  The expansion band 30 is for pressing and fixing the outer fixed cylinder portion 21 of the flexible member 20 to the inner surface of the outer cylinder member 10, and can be made of the same material as the outer cylinder member 10. The main body portion of the expansion band 30 is formed so as to extend along the inner surface of the outer fixed cylinder portion 21 of the flexible member 20, and as shown in FIG. 5, has an annular shape in which one place in the circumferential direction is cut. ing. As shown in FIG. 1, the main body portion of the extension band 30 is fitted between the outer end protruding portion 21 a and the inner end protruding portion 21 b of the outer fixed cylinder portion 21 of the flexible member 20. The expansion band 30 is provided with four engaging portions 31, 31,... That engage with the wall 104 of the manhole 100. As shown in FIG. 5, the number of the engaging portions 31 is preferably four, but it is sufficient that there are at least two.

  The engaging portions 31, 31,... Are arranged at intervals in the circumferential direction of the expansion band 30. The engaging portion 31 includes a fixed plate portion 31a that is fixed to the inner surface of the main body portion of the extension band 30, and a protruding plate portion 31b that protrudes radially outward from the end portion of the fixed plate portion 31a. With the expansion band 30 fixing the outer fixed cylindrical portion 21 of the flexible member 20 to the inner surface of the outer cylindrical member 10, the protruding end portion of the protruding plate portion 31 b is radially outward from the outer surface of the outer cylindrical member 10. The protruding portion engages with the outer cylinder member 10 from the outside of the manhole 100. When the engaging portion 31 engages with the outer cylinder member 10, the expansion band 30 is fixed to the wall 104 of the manhole 100 via the outer cylinder member 10, and as a result, the flexible member 20 caused by water pressure is fixed. Displacement is suppressed. If the protruding amount of the extension band 30 in the protruding plate portion 31b in the radial direction is large, the cutting range of the manhole 100 is widened.

  A guide plate 33 is provided on the outer surface of the main body portion of the extension band 30. The guide plate 33 is disposed so as to cover the cut portion of the extension band 30 from the outside, and is fixed to one end portion in the circumferential direction of the main body portion of the extension band 30. The other end in the circumferential direction of the main body portion of the extension band 30 can slide on the guide plate 33.

  As shown in FIGS. 6 to 9, the extension band 30 is provided with a mounting portion 36 for detachably attaching a connection tool 35 for connecting an expansion device (expansion means) for applying an expansion force to the expansion band 30. ing. The attachment part 36 is comprised with the metal board | plate material, and is being fixed by welding to the circumferential direction one end part vicinity of the main body part of the expansion band 30, and the other end part vicinity, respectively. The edge of the attachment portion 36 is spaced radially inward from the inner surface of the main body portion of the expansion band 30.

  The connector 35 is formed with a hole 35a for inserting the expansion device and a recess 35b for inserting the edge of the attachment portion 36. By inserting the edge of the mounting portion 36 into the recess 35b, the connecting tool 35 is fixed to the mounting portion 36. When the edge of the mounting portion 36 is removed from the recess 35b, the connecting tool 35 is attached to the mounting portion 36. Therefore, the attachment portion 36 can be easily attached to and detached from the connector 35.

  Although not shown, the expansion device includes, for example, an expansion force generation unit such as a hydraulic cylinder, and a pair of arms for causing the expansion force generated by the expansion force generation unit to act on the couplers 35 and 35. The tip of the arm can be inserted into the hole 35 a of the connector 35. When the expansion force generated by the expansion force generating portion is applied to the connecting device 35 via the arm in a state where the tip portion of each arm is inserted into the hole 35a of the connecting device 35, the interval between the attachment portions 36 and 36 is increased. In other words, the expansion force acts so that the distance between the circumferential end portions of the main body portion of the expansion band 30 is increased, whereby the diameter of the expansion band 30 is expanded and the outer fixed cylindrical portion 21 of the flexible member 20 is expanded. Is pressed against the inner surface of the outer cylinder member 10 and fixed. After the expansion band 30 is expanded to a desired diameter, a spacer (not shown) that fills the gap is fitted between both circumferential ends of the main body portion of the expansion band 30 to maintain the expanded diameter. Therefore, the expansion device and the connecting tool 35 can be detached from the expansion band 30. As the expansion device, for example, a device as shown in FIG. 4 of JP-A-9-329277 can be used.

  Next, a method for attaching the flexible joint 1 will be described. Before attaching the flexible joint 1, a step of fixing the flexible member 20 to the outer cylinder member 10 is performed. That is, after the flexible member 20 is accommodated in the outer cylindrical member 10, the main body portion of the expansion band 30 is fitted between the outer end protruding portion 21a and the inner end protruding portion 21b of the outer fixed cylindrical portion 21 of the flexible member 20. . Thereafter, as shown in FIG. 7, the edge of the attachment portion 36 is inserted into the recess 35 b of each connection device 35 to fix the connection device 35 to the attachment portion 36. Then, the arm of the expansion device is inserted into the hole 35a of each connector 35 to expand the expansion band 30 to a desired diameter, and the outer fixed cylindrical portion 21 of the flexible member 20 is pressed against the inner surface of the outer cylindrical member 10. Then, a spacer is fitted between the circumferential ends of the main body portion of the expansion band 30. Thereafter, the arm of the expansion device is pulled out from the hole 35 a of each connecting tool 35, and the edge of the mounting portion 36 is pulled out from the recess 35 b to remove the connecting tool 35 from the mounting portion 36.

  On the other hand, the existing manhole 100 is as shown in FIG. The wall 104 of the manhole 100 is provided with a filler 104 a such as concrete along the outer surface of the existing pipe 101, and the filler 104 a constitutes a part of the wall 104. As shown in FIG. 11, the connecting portion between the manhole 100 and the existing pipe 101 is cut from the inside of the manhole 100 to form a recess 104 b for accommodating the flexible joint 1. When forming the recess 104b, the end of the existing pipe 101 is also cut. At the time of cutting, the outer part of the manhole 100 in the existing filler 104a is left.

  Then, the process of manufacturing the rehabilitation pipe | tube 102 is performed. As shown in FIG. 12, a jacket 105 for limiting the diameter to an appropriate diameter is disposed at the end of the existing pipe 101. The jacket 105 is for producing the rehabilitation pipe 102, and the inner diameter of the jacket 105 is set to be substantially the same as the inner diameter of the existing pipe 101. Since the pipe making method of the rehabilitation pipe 102 is a conventionally well-known method, a detailed description thereof will be omitted. After manufacturing the rehabilitation pipe 102, the jacket 105 is removed. The end of the rehabilitation pipe 102 protrudes from the end of the existing pipe 101.

  Next, as shown in FIG. 13, the end portion of the rehabilitation pipe 102 is inserted into the inner fixed cylinder portion 22 of the flexible member 20, and the flexible joint 1 is accommodated in the concave portion 104 b of the wall 104 of the manhole 100. For example, an amorphous sealing material or non-vulcanized butyl rubber may be interposed between the inner fixed cylinder portion 22 of the flexible member 20 and the end portion of the rehabilitation pipe 102 as a sealing material for improving the water-stopping property. Good.

  When the closing member 13 is removed from the outer cylinder member 10, the fastening portion 41 of the fastening band 40 faces the outside from the cutout portion 12 a of the outer cylinder member 10 as shown in FIG. 4. For this reason, the tool for fastening the fastening part 41 of the fastening band 40 can be easily inserted into the outer cylinder member 10 from the notch part 12a, and the fastening part 41 can be fastened by the tool. After the inner fixed cylinder portion 22 of the flexible member 20 is pressed against and fixed to the outer surface of the rehabilitation pipe 102 by the fastening band 40, the closing member 13 is fastened to the outer cylinder member 10.

  Then, the process which fixes the outer cylinder member 10 to the wall 104 of the manhole 100 is performed. As shown in FIG. 1, when a filler 104 c such as epoxy resin is filled outside the flexible joint 1 in the recess 104 b of the wall 104 of the manhole 100 and solidified, the filler 104 c becomes a part of the wall 104. The outer cylinder member 10 is fixed to the wall 104 of the manhole 100, and the expansion band 30 is fixed to the wall 104 of the manhole 100 via the engaging portion 31 and the outer cylinder member 10. The filler 104c may be, for example, quick setting mortar, non-shrink mortar, or the like.

  As shown in FIG. 1, when the flexible joint 1 is mounted, the flexible member 20 is provided with the folded portion 23. For example, when the existing pipe 101 and the renovated pipe 102 are about to be displaced in the axial direction when an earthquake occurs. The amount of displacement of the existing pipe 101 and the rehabilitated pipe 102 can be increased by deforming in the direction in which the folded portion 23 is deployed.

  On the other hand, since the folded portion 23 maintains its shape until the existing pipe 101 and the rehabilitated pipe 102 are displaced in the axial direction, the dimension of the flexible member 20 in the axial direction may be short. Therefore, even if the wall 104 of the manhole 100 is thin (for example, the wall thickness is 75 mm for the No. 1 manhole), the entire flexible member 20 or most of the flexible member 20 can be accommodated in the wall 104 of the manhole 100, resulting in a flow-flow obstacle. Further, breakage and deterioration of the flexible member 20 are also suppressed.

  And since the dimension of the axial direction of the flexible member 20 may be short, the dimension of the whole axial direction of the flexible joint 1 can be shortened. Thereby, since the depth of the recessed part 104b formed in the wall 104 of the manhole 100 can be made shallow, the workability | operativity which forms the recessed part 104b improves.

  As shown in FIG. 14, for example, when the water pressure is applied to the flexible member 20 from the outside of the manhole 100, the folded portion 23 may be deformed so as to bulge into the manhole 100. The end plate portion 12 and the closing member 13 are provided on the outer cylinder member 10 fixed to the wall 104 of the 100, and the end plate portion 12 and the closing member 13 suppress the bulging of the folded portion 23. The flow failure is less likely to occur over a period of time, and damage and deterioration of the flexible member 20 are suppressed.

  Moreover, since the connection tool 35 for connecting the expansion device of the expansion band 30 is detachably attached to the expansion band 30, the connection tool 35 can be detached from the expansion band 30 after the expansion work. Since there is no connection tool 35, the flexible joint 1 becomes compact and the radial thickness becomes thin. As a result, the diameter of the recess 104b formed in the wall 104 of the manhole 100 to accommodate the flexible joint 1 is reduced, and the depth of the recess 104b is reduced, thereby improving workability. Further, even if the thickness of the flexible joint 1 in the radial direction is reduced, a margin space corresponding to the height of the coupler 35 is created, so that interference with the existing pipe 101 is also prevented when an earthquake occurs.

  In the method of attaching the flexible joint 1 of the above embodiment, the connecting portion between the manhole 100 and the existing pipe 101 is cut from the inside of the manhole 100 to form the recess 104b for accommodating the flexible joint 1, and then the existing pipe Although the renovated pipe 102 is manufactured in 101, and the flexible joint 1 is accommodated in the recessed part 104b after that, it is not restricted to this, For example, as shown in FIG.15 and FIG.16, the renovated pipe 102 is added to the existing pipe 101, for example. After that, the connecting portion between the manhole 100 and the existing pipe 101 is cut from the inner side of the manhole 100 to form the concave portion 104b for accommodating the flexible joint 1, and then the flexible joint 1 is formed in the concave portion 104b. It may be accommodated and the outer cylinder member 10 may be fixed to the wall 104 of the manhole 100.

  Further, as in the modification of the embodiment shown in FIG. 17, the open portion 11 a of the outer cylinder member 10 may be omitted, and the arc plate portion 13 b of the closing member 13 may be omitted. In this modification, the strength of the outer cylinder member 10 can be improved by omitting the open portion 11a of the outer cylinder member 10.

  The above-described embodiment is merely an example in all respects and should not be interpreted in a limited manner. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

  As described above, the flexible joint and the flexible joint mounting method according to the present invention can be applied to, for example, a connection portion between a manhole having a thin wall thickness and an existing pipe.

DESCRIPTION OF SYMBOLS 1 Flexible joint 10 Outer cylinder member 12 End plate part (swelling suppression part)
12a Notch part 13 Blocking member 13a Vertical plate part (bulging suppression part)
20 Flexible member 21 Outer fixed cylinder part 22 Inner fixed cylinder part 23 Folded part 30 Expansion band (expansion member)
31 Engagement section 100 Manhole 101 Existing pipe 102 Rehabilitation pipe 104 Wall 104b Recess

Claims (6)

In the flexible joint provided at the connection part of the pipe member connected to the manhole in a state inserted in the wall of the manhole,
The flexible joint has an outer cylinder member fixed to the wall in a state of being accommodated in the wall in which the pipe member in the manhole is inserted, and flexibility disposed in the outer cylinder member. A flexible member made of a waterstop material having,
The flexible member is formed so as to extend along the inner surface of the outer cylinder member and is fixed to the inner surface, and is formed so as to extend along the outer surface of the tube member. An inner fixed tube portion to be fixed, and a folded portion folded between the outer fixed tube portion and the inner fixed tube portion,
Inside the manhole in the outer cylinder member, a bulge restraining portion that suppresses the bulging portion of the flexible member from bulging into the manhole is provided so as to protrude radially inward. A flexible joint characterized by The flexible joint according to claim 1,
The flexible joint has an expansion member for pressing and fixing the outer fixed cylinder portion of the flexible member to the inner surface of the outer cylinder member, and the expansion member engages with the outer cylinder member. A flexible joint provided with an engaging portion. The flexible joint according to claim 1 or 2,
A flexible joint, wherein a part of the bulge suppressing part is provided with a notch, and a closing member for closing the notch is detachably attached to the outer cylinder member. In the flexible joint as described in any one of Claim 1 to 3,
The flexible joint has an expansion member for pressing and fixing the outer fixed cylindrical portion of the flexible member to the inner surface of the outer cylindrical member, and the expansion member acts on the expansion member. A flexible joint, characterized in that an attachment portion for detachably attaching a connector for connecting the expansion means is provided. In the mounting method of the flexible joint provided in the connection part of the existing pipe connected to the manhole in a state inserted in the wall of the manhole,
After forming a rehabilitation pipe on the existing pipe, a step of cutting a connecting portion between the manhole and the existing pipe from the inside of the manhole to form a recess for accommodating the flexible joint;
The concave joint formed in the wall of the manhole accommodates the flexible joint provided with an outer cylinder member and a flexible member made of a water-stopping material having flexibility disposed inside the outer cylinder member. Fixing the outer cylinder member to the wall of the manhole;
Fixing the outer fixed cylindrical portion of the flexible member to the inner surface of the outer cylindrical member;
Fixing the inner fixed cylinder part of the flexible member to the outer surface of the rehabilitation pipe;
A folded portion that is folded between the outer fixed cylinder portion and the inner fixed cylinder portion is provided, and the folded portion of the flexible member swells into the manhole inside the manhole in the outer cylinder member. And a step of providing a bulge suppressing part for suppressing the protrusion. In the mounting method of the flexible joint provided in the connection part of the existing pipe connected to the manhole in a state inserted in the wall of the manhole,
After forming a recess for accommodating the flexible joint by cutting a connection portion between the manhole and the existing pipe from the inside of the manhole, a step of producing a renovated pipe on the existing pipe;
The concave joint formed in the wall of the manhole accommodates the flexible joint provided with an outer cylinder member and a flexible member made of a water-stopping material having flexibility disposed inside the outer cylinder member. Fixing the outer cylinder member to the wall of the manhole;
Fixing the outer fixed cylindrical portion of the flexible member to the inner surface of the outer cylindrical member;
Fixing the inner fixed cylinder part of the flexible member to the outer surface of the rehabilitation pipe;
A folded portion that is folded between the outer fixed cylinder portion and the inner fixed cylinder portion is provided, and the folded portion of the flexible member swells into the manhole inside the manhole in the outer cylinder member. And a step of providing a bulge suppressing part for suppressing the protrusion.

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