JP2017227053A - Earthquake resisting joint for manhole, and mounting method for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a cost low and make mounting workability proper, by enabling an earthquake resisting joint for a manhole to be carried into the manhole from an opening of the manhole without being split, on an earthquake resisting improvement site.SOLUTION: An earthquake resisting joint 1 for a manhole is radially deformed so that its external dimension can be set equal to or smaller than a diameter of an opening 101 of the manhole 100, and subsequently carried into the manhole 100. After that, a shape of the earthquake resisting joint 1 for the manhole is restored to a shape closely akin to a shape before deformation or the shape before deformation. The earthquake resisting joint 1 for the manhole is arranged at an end of a sewerage pipe 200.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a seismic joint for manholes attached to a connecting portion between a manhole and a sewer pipe, and a method for attaching the seismic joint.

  As shown in FIG. 1, the sewage pipe trough has a manhole 100 provided at a predetermined interval and a sewer pipe 200 connected to the manhole 100. An opening 101 through which an operator can enter and exit is formed in the upper portion of the manhole 100. The opening 101 is normally closed by a lid (not shown). In general, the diameter of the opening 101 is set smaller than the inner diameter of the peripheral wall portion 102 of the manhole 100. An insertion hole 104 into which the end of the sewer pipe 200 is inserted is formed in the peripheral wall portion 102 of the manhole 100, and the end of the sewer pipe 200 is inserted into the insertion hole 104. Is connected to the manhole 100 so that sewage can flow into the manhole 100 from the sewer pipe 200 and sewage within the manhole 100 can flow into the sewer pipe 200. An invert 105 is provided at the bottom of the manhole 100.

  Here, assuming the occurrence of an earthquake, the manhole 100 and the sewer pipe 200 move differently. For example, it is conceivable that the sewer pipe 200 moves so as to come out from the insertion hole 104 of the manhole 100 or, conversely, moves so as to be inserted deeply into the insertion hole 104.

  However, when the manhole 100 and the sewer pipe 200 are rigidly coupled as shown in FIG. 1, the relative displacement of the manhole 100 and the sewer pipe 200 is absorbed at the connection portion between the manhole 100 and the sewer pipe 200 when an earthquake occurs. In other words, cracks or the like occur in each part, and the sewage flow function cannot be maintained.

  On the other hand, in patent document 1, a flexible water stop member is provided in the connection part of the manhole 100 and the sewer pipe 200, and the relative displacement of the manhole 100 and the sewer pipe 200 is the said water stop member. So that it can be absorbed. The flexible water stop member includes a cylindrical rigid collar and a flexible joint made of rubber or the like provided inside the rigid collar. The rigid collar is fixed to the peripheral wall portion 102 of the manhole 100, the outer cylindrical portion of the flexible joint is fixed to the inner peripheral surface of the rigid collar, and the inner cylindrical portion of the flexible joint is the outer peripheral surface of the sewer pipe. Fixed to.

JP 2003-74078 A

  By the way, since the outer diameter of the flexible water stop member of patent document 1 is attached to the outer side of a sewer pipe, it is larger than the outer diameter of a sewer pipe. On the other hand, since the diameter of the opening 101 of the manhole 100 is set smaller than the inner diameter of the peripheral wall 102, the outer diameter of the flexible water-stopping member of Patent Document 1 is the diameter of the opening 101 of the manhole 100. May be smaller. In this case, it becomes impossible to bring the flexible water-stopping member of Patent Document 1 into the manhole 100 as it is. On the other hand, a structure can be considered in which the rigid collar is divided into a plurality of members and brought into the manhole 100, and then assembled, but this increases the number of parts and the number of man-hours for mounting. There has been a problem that the installation work becomes complicated.

  The present invention has been made in view of such a point, and the object of the present invention is to be able to bring the manhole seismic joint into the manhole from the opening without dividing the manhole seismic joint at the site of the earthquake-proof repair. By doing so, it is to reduce the cost and to improve the mounting workability.

  In order to achieve the above object, in the present invention, the cylindrical rigid body disposed outside the flexible member is deformed and brought into the manhole from the opening of the manhole, and then the rigid body is restored to the original. It was made to restore until it became the shape approximated to the shape or the original shape.

The first invention is
It is provided between the peripheral wall portion of the manhole and the outer peripheral surface of the sewer pipe inserted into the peripheral wall portion, and connects the manhole and the sewer pipe and absorbs the relative displacement between the manhole and the sewer pipe. In manhole seismic joints with flexibility,
An inner cylinder fixed to the outer peripheral surface of the sewer pipe, an outer cylinder formed to surround the inner cylinder, and extending from the inner cylinder to the outer cylinder, the inner cylinder and the outer A flexible member having a water-stopping property having a connecting portion for connecting the cylindrical portion;
A cylindrical rigid body that is fixed to the outer peripheral surface of the outer cylindrical portion and fixed to the peripheral wall portion of the manhole, and is made of a member having higher rigidity than the flexible member;
The outer dimension of the manhole seismic joint is set to be larger than the diameter of the opening provided in the upper part of the manhole,
The seismic joint for manhole has a first shape deformed in a radial direction until an outer dimension thereof is equal to or less than a diameter of the opening of the manhole, and a shape or a deformation in which the first shape approximates a shape before deformation. It is characterized in that the second shape restored to the previous shape is obtained.

  According to this configuration, when the seismic joint for manhole is deformed in the radial direction to have the first shape, the outer dimension of the seismic joint for manhole is equal to or less than the diameter of the opening of the manhole, so the seismic joint for manhole is disassembled. Without any problem, it can be brought into the manhole from the opening of the manhole. Then, by making the seismic joint for manhole into the second shape, the shape of the seismic joint for manhole becomes a shape that approximates the shape before deformation or a shape before deformation. Thereby, the seismic joint for manhole can be arranged between the peripheral wall portion of the manhole and the sewer pipe.

  And by fixing the inner cylinder part of the flexible member of the seismic joint for manholes to the outer peripheral surface of the sewer pipe, and fixing the rigid body to the peripheral wall part of the manhole, the seismic joint for manholes is attached, The manhole and the sewer pipe are connected by the seismic joint for manhole. In this state, for example, when an earthquake occurs and the manhole and the sewer pipe are relatively displaced, the connecting portion between the inner cylinder portion and the outer cylinder portion of the flexible member is deformed, so that the manhole and the sewer pipe are deformed. Relative displacement is allowed.

According to a second invention, in the first invention,
The rigid body is formed in a cylindrical shape,
The rigid body is provided with a deformation starting point portion that is a starting point of deformation when the rigid body is deformed until the first shape is obtained.

  That is, when the rigid body is cylindrical, it is difficult to predict where it will be deformed in the circumferential direction when the seismic joint for manhole is deformed in the radial direction into the first shape, and the deformation of the rigid body is also difficult. There is a risk that workability will deteriorate due to an increase in force required for the operation. In this invention, since the deformation starting point is provided in the rigid body, it is possible to clearly grasp the deformation from the deformation starting point when the seismic joint for manhole is deformed in the radial direction. It can be easily deformed with a relatively small force.

According to a third invention, in the second invention,
The said deformation | transformation origin part is comprised by the convex part formed in the said rigid body, It is characterized by the above-mentioned.

  According to this configuration, the deformation starting point portion can be obtained with a simple configuration in which the convex portion is formed on the rigid body.

According to a fourth invention, in the first invention,
The rigid body has a polygonal cross section.

  According to this configuration, since the rigid body has a polygonal cross section, the rigid body has a plurality of corners. Therefore, when the seismic joint for manhole is deformed in the radial direction to form the first shape, the corner portion of the rigid body becomes the starting point of the deformation, so that the rigid body can be easily deformed.

The fifth invention is:
It is provided between the peripheral wall portion of the manhole and the outer peripheral surface of the sewer pipe inserted into the peripheral wall portion, and connects the manhole and the sewer pipe and absorbs the relative displacement between the manhole and the sewer pipe. In the installation method of the seismic joint for manholes with flexibility,
An inner cylinder part; an outer cylinder part formed so as to surround the inner cylinder part; and a connection part extending from the inner cylinder part to the outer cylinder part and connecting the inner cylinder part and the outer cylinder part. A flexible member with water-stopper,
A cylindrical rigid body made of a member that is fixed to the outer peripheral surface of the outer cylinder portion and is more rigid than the flexible member,
The manhole seismic joint is deformed in the radial direction so that the outer dimension of the manhole seismic joint is equal to or less than the diameter of the opening provided in the upper part of the manhole. After bringing it into the manhole from the opening,
Restore the shape of the above-mentioned seismic joint for manhole until it becomes a shape that approximates the shape before deformation or the shape before deformation,
Thereafter, the seismic joint for manholes is disposed at the end of the sewer pipe, the inner cylindrical portion of the flexible member is fixed to the outer peripheral surface of the sewer pipe, and the outer peripheral surface of the rigid body is the peripheral wall of the manhole. It is fixed to the part.

  According to this configuration, the manhole seismic joint is deformed in the radial direction so that the outer dimension of the manhole seismic joint is equal to or less than the diameter of the manhole opening. It is possible to bring it into the manhole from the part. Thereafter, the shape of the seismic joint for manhole is changed to a shape that approximates the shape before deformation or the shape before deformation, and the seismic joint for manhole can be disposed between the peripheral wall portion of the manhole and the sewer pipe.

  And, by fixing the inner cylindrical part of the flexible member of the seismic joint for manholes to the outer peripheral surface of the sewer pipe, and fixing the rigid body to the peripheral wall part of the manhole, the seismic joint for manholes is attached. The manhole and the sewer pipe are connected by the seismic joint for manhole. In this state, for example, when an earthquake occurs and the manhole and the sewer pipe are relatively displaced, the connecting portion between the inner cylinder portion and the outer cylinder portion of the flexible member is deformed, so that the manhole and the sewer pipe are deformed. Relative displacement is allowed.

According to a sixth invention, in the fifth invention,
When the seismic joint for manholes is deformed in the radial direction, the manhole seismic joint is deformed starting from a deformation starting point provided on the rigid body.

  According to this configuration, the rigid body can be easily deformed with a relatively small force.

  According to the first invention, since the seismic joint for manhole is deformed until it becomes equal to or less than the diameter of the opening of the manhole, it can be restored until it becomes a shape approximate to the shape before deformation or a shape before deformation. In addition, the seismic joint for manholes can be easily brought into the manhole from the opening of the manhole without dividing the seismic joint for manholes at the site of seismic retrofitting. As a result, the cost of the seismic joint for manholes can be reduced, and the workability of mounting the seismic joint for manholes can be improved.

  According to the second invention, since the deformation starting point is provided on the cylindrical rigid body, it is possible to clearly grasp that the rigid body is deformed from the deformation starting point, and it is possible to easily deform the rigid body.

  According to the third aspect of the invention, the deformation starting point can be obtained with a simple configuration, so that the cost of the rigid body having the deformation starting point can be reduced.

  According to the fourth aspect, since the rigid body has a polygonal cross section, the rigid body can be easily deformed.

  According to the fifth invention, since the seismic joint for manholes can be easily brought into the manhole from the opening of the manhole without dividing the seismic joint for manholes at the site of seismic retrofit, the cost of the seismic joint for manholes can be reduced. It is possible to improve the workability of the manhole seismic joint.

  According to the sixth aspect, the rigid body can be easily deformed.

It is sectional drawing which shows a part of existing sewage pipe rod. It is a front view of the earthquake-resistant joint for manholes. It is the III-III sectional view taken on the line in FIG. FIG. 2 is a view corresponding to FIG. 1 showing a state where the seismic joint for manhole is deformed in the radial direction and is inserted into the opening of the manhole. FIG. 2 is a view corresponding to FIG. 1 showing a state in which the shape of the seismic joint for manholes is restored and the installation place of the seismic joint for manholes is secured. FIG. 2 is a view corresponding to FIG. 1 showing a state where the installation of the manhole seismic joint is completed. It is FIG. 2 equivalent view which concerns on the modification 1 of embodiment. It is FIG. 2 equivalent view which concerns on the modification 2 of 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. 2 shows the seismic joint 1 for manholes according to the embodiment of the present invention, and is a view seen from the front. The sewer pipe rod to which the seismic joint for manhole 1 is attached is configured as shown in FIG. 1, and has a manhole 100 provided at a predetermined interval and a sewer pipe 200 connected to the manhole 100. ing. The manhole 100 is for performing maintenance such as inspection and cleaning of the sewer pipe, and a space is provided in the interior so that an operator can enter.

  The upper side of the manhole 100 has a smaller cross-sectional shape as it approaches the upper end. An opening 101 through which an operator can enter and exit is formed at the upper end of the manhole 100, and this opening 101 is normally closed by a lid (not shown). The opening 101 is substantially circular, and its diameter is set smaller than the inner diameter of the peripheral wall 102 of the manhole 100. The peripheral wall portion 102 of the manhole 100 has a circular cross section. An insertion hole 104 into which an end of the sewer pipe 200 is inserted is formed in the lower portion of the peripheral wall portion 102. With the end of the sewer pipe 200 inserted into the insertion hole 104, the sewer pipe 200 is connected to the manhole 100, and sewage is allowed to flow into the manhole 100 from the sewer pipe 200, It is possible to flow into the sewer pipe 200. An invert 105 is provided at the bottom of the manhole 100.

  FIG. 1 shows a sewer pipe before the manhole seismic joint 1 is attached. Before the manhole seismic joint 1 is attached, the sewer pipe 200 is rigidly coupled to the manhole 100, and when the earthquake occurs, the relative displacement of the manhole 100 and the sewer pipe 200 at the connection portion between the manhole 100 and the sewer pipe 200 is achieved. It is a structure that can hardly absorb.

(Configuration of seismic joint for manhole)
The seismic joint 1 for manholes shown in FIGS. 2 and 3 is used when the sewer pipe 200 in which the sewer pipe 200 is rigidly connected to the manhole 100 is repaired. As shown in FIG. 100 is provided between the peripheral wall portion 102 and the outer peripheral surface of the sewer pipe 200 inserted into the peripheral wall portion 102 to connect the manhole 100 and the sewer pipe 200, and to change the relative displacement between the manhole 100 and the sewer pipe 200. It is a flexible joint which has the flexibility to absorb.

  That is, as shown in FIGS. 2 and 3, the manhole seismic joint 1 includes a flexible member 10 having water-stopping properties and a cylindrical rigid body 20 including a member having higher rigidity than the flexible member 10. And. The flexible member 10 can be composed of an elastic member. Examples of the material of the flexible member 10 include, but are not limited to, synthetic rubber such as styrene / butadiene / rubber, EPDM, and chloroprene rubber, natural rubber, and thermoplastic elastomer.

  The flexible member 10 includes an inner cylinder part 12 fixed to the outer peripheral surface of the sewer pipe 200, an outer cylinder part 11 formed so as to surround the inner cylinder part 12, and from the inner cylinder part 12 to the outer cylinder part 11. It has the connection part 13 which extends and connects this inner cylinder part 12 and this outer cylinder part 11, and the outer cylinder part 11, the inner cylinder part 12, and the connection part 13 are integrally molded. The inner cylinder portion 12 has a cylindrical shape formed along the outer peripheral surface of the sewer pipe 200. As shown in FIG. 3, the outer cylinder portion 11 has a cylindrical shape that is concentric with the inner cylinder portion 11, and the inner diameter of the outer cylinder portion 11 is the inner peripheral surface of the outer cylinder portion 11 and the inner cylinder. It is set so that a predetermined space S can be formed between the outer peripheral surface of the portion 12.

  The connecting portion 13 has a plate shape that extends radially outward from one end portion in the center line direction of the inner cylindrical portion 12 and extends over the entire circumference of the inner cylindrical portion 12. The radially outer end portion of the connecting portion 13 is continuous with one end portion in the center line direction of the outer cylinder portion 11. Therefore, the cross-sectional shape of the flexible member 10 becomes a cross-sectional shape close to a substantially U shape over the entire circumference due to the outer cylinder portion 11, the inner cylinder portion 12 and the connection portion 13. The space S is open on the side opposite to the side where the connecting portion 13 is provided. As will be described later, the backup material 14 shown in FIG. 6 is inserted into the space S.

  In addition, in this embodiment, although the connection part 13 has comprised the plate shape extended in radial direction, it is not restricted to this, The plate shape in which the connection part 13 bent may be sufficient.

  The material which comprises the rigid body 20 can use stainless steel, a rust prevention plating rope, a hard plastic, a fiber reinforced plastic etc. individually or in combination, for example. The material constituting the rigid body 20 is, for example, a material that can be restored to a shape that approximates the shape before deformation or a shape before deformation without cracking even when bent.

  In this embodiment, the rigid body 20 is configured by forming a stainless steel plate into a cylindrical shape and joining both ends by welding. The inner peripheral surface of the rigid body 20 is fixed to the outer peripheral surface of the outer cylinder portion 11 of the flexible member 10 over the entire periphery, and water from between the rigid body 20 and the flexible member 10 is attached. Leakage is prevented beforehand. The rigid body 20 and the outer cylinder part 11 can be bonded using, for example, a known adhesive. By integrating the rigid body 20 and the outer cylinder part 11, deformation of the outer cylinder part 11 due to water pressure can be suppressed by the rigid body 20. In addition, the dimension in the center line direction of the rigid body 20 and the dimension in the center line direction of the outer cylinder portion 11 of the flexible member 10 can be set to be approximately the same.

  The outer dimension of the manhole seismic joint 1, that is, the outer dimension of the rigid body 20 is set larger than the diameter of the opening 101 of the manhole 100. This is because the size of the manhole seismic joint 1 is matched to the outer diameter of the sewer pipe 200 and is set regardless of the diameter of the opening 101.

  The manhole seismic joint 1 has a first shape deformed in the radial direction until the outer dimension is equal to or smaller than the diameter of the opening 101 of the manhole 100, and a shape or deformation in which the first shape approximates the shape before the deformation. The second shape is restored until the previous shape is obtained. The first shape is the shape shown in FIG. 4, and by applying a force that radially crushes the manhole seismic joint 1, the manhole seismic joint 1 is shaped like an oval or an ellipse. The outer dimension in the minor axis direction is at least the same as the diameter of the opening 101. Thereby, the outer dimension of the seismic joint 1 for manhole becomes a dimension which can put this seismic joint 1 for manhole in the opening part 101. FIG. In the first shape, it is preferable that the outer dimension of the short axis direction of the manhole seismic joint 1 is smaller than the diameter of the opening 101 of the manhole 100, whereby the manhole seismic joint 1 can be easily formed in the opening 101. Can be put.

  The second shape is the shape shown in FIG. When the second shape is adopted, the shape of the manhole seismic joint 1 is restored by applying an expansion force to the manhole seismic joint 1 having the first shape in the minor axis direction. The second shape is preferably substantially the same as the shape before the first shape, but if the sewer pipe 200 can be inserted into the inner cylinder portion 12 of the manhole seismic joint 1. It may be a shape that approximates the shape before deformation. That is, since the flexible member 10 is made of a flexible member, even if the inner shape of the inner cylindrical portion 12 does not completely match the outer shape of the sewer pipe 200, the inner cylindrical portion 12 and the connecting portion. By deforming 13, the inner cylinder portion 12 follows the outer shape of the sewer pipe 200. Therefore, it is not necessary to make the shape of the manhole seismic joint 1 completely coincide with the original shape inside the manhole 100.

(Mounting method of seismic joint for manhole)
Next, the attachment method of the seismic joint 1 for manholes comprised as mentioned above is demonstrated. The seismic joint 1 for manholes is used when the sewer pipe shown in FIG. First, the manhole seismic joint 1 including the flexible member 10 and the rigid body 20 is prepared. At this time, the manhole seismic joint 1 is circular as shown in FIG. Moreover, the flexible member 10 and the rigid body 20 are integrated.

  Then, as shown in FIG. 4, the seismic joint 1 for manholes is made into a 1st shape by applying the force crushed in the radial direction with respect to the seismic joint 1 for manholes. Then, the seismic joint 1 for manholes having the first shape is put into the opening 101 of the manhole 100. This is the manhole seismic joint insertion process.

  After the manhole seismic joint 1 is completely inserted into the manhole 100, an expansion force is applied to the manhole seismic joint 1 to form the second shape as shown in FIG. Moreover, as shown in the figure, the space around the end portion of the sewer pipe 200 in the peripheral wall portion 102 of the manhole 100 is excavated by using a rock drill or the like (not shown), and a space for arranging the manhole seismic joint 1 is provided. Form. This is the excavation process. In this excavation process, the invert 105 is excavated as necessary, but the end of the sewer pipe 200 is left. In addition, it is preferable to inject | harden and harden the hardening agent to the earth and sand outside the surrounding wall part 102 of the manhole 100 before excavation.

  Next, as shown in FIG. 6, the manhole seismic joint 1 is disposed at the end of the sewer pipe 200. At this time, the manhole seismic joint 1 is disposed so that the space S of the flexible member 10 is opened inside the manhole 100, and the backup material 14 is inserted into the space S. The backup material 14 can be made of, for example, polyethylene foam, urethane, rubber foam, or the like.

  Further, the inner cylinder portion 12 of the flexible member 10 is fixed to the outer peripheral surface of the sewer pipe 200. At this time, a metal fastening band (not shown) or the like is disposed on the outer peripheral surface of the inner cylindrical portion 12, and the inner cylindrical portion 12 is fastened and fixed to the outer peripheral surface of the sewer pipe 200 by this fastening band.

  Further, the outer peripheral surface of the rigid body 20 is fixed to the peripheral wall portion 102 of the manhole 100. That is, the portion excavated in the excavation process is filled with a filler 106 made of watertight mortar or the like. The filler 106 is filled so as to spread over the entire outer peripheral surface of the rigid body 20. When the filler 106 is cured, the outer peripheral surface of the rigid body 20 is fixed to the peripheral wall 102 of the manhole 100 via the filler 106. Examples of the filler 106 include quick setting mortar, non-shrink mortar, aqueous epoxy bond, and the like.

  Prior to filling with the filler 106, an irregular sealing material (not shown) may be placed on the outer peripheral surface of the rigid body 20. Examples of the amorphous sealing material include urethane-based caulking, silicon-based caulking, butyl rubber-based caulking, and epoxy-based caulking.

(Effect of embodiment)
As described above, in this embodiment, when the seismic joint for manhole 1 is deformed in the radial direction to have the first shape, the outer dimension of the seismic joint for manhole 1 is equal to or smaller than the diameter of the opening 101 of the manhole 100. Therefore, the manhole seismic joint 1 can be brought into the manhole 100 from the opening 101 of the manhole 100 without disassembling into a plurality of parts.

  After that, by making the manhole seismic joint 1 into the second shape, the shape of the manhole seismic joint 1 becomes a shape that approximates the shape before deformation or the shape before deformation. It can arrange | position between the 100 surrounding wall parts 101 and the sewer pipes 200. Therefore, the number of parts constituting the manhole seismic joint 1 can be reduced to reduce the cost of the manhole seismic joint 1 and the workability of the manhole seismic joint can be improved.

  And the inner cylinder part 12 of the flexible member 10 of the seismic joint 1 for manholes is fixed to the outer peripheral surface of the sewer pipe 200, and the rigid body 20 is fixed to the peripheral wall part 102 of the manhole 100. The manhole 100 and the sewer pipe 200 are connected by the manhole seismic joint 1. In this state, for example, when an earthquake occurs and the manhole 100 and the sewer pipe 200 are relatively displaced, the connecting portion 13 between the inner tube portion 12 and the outer tube portion 11 of the flexible member 10 is deformed. Thus, since the relative displacement between the manhole 100 and the sewer pipe 200 is allowed, it is possible to prevent the occurrence of cracks or the like in each part. Moreover, although the sewer pipe 200 may be displaced in the direction in which the center line is inclined, the displacement of the sewer pipe 200 can also be absorbed by the deformation of the connecting portion 13 in this case. Therefore, it is possible to maintain the sewage flow function.

(Other embodiments)
In the above embodiment, the rigid body 20 of the manhole seismic joint 1 is formed into a circular shape, and on the assumption of this shape, the first to fourth convex portions 21 to 24 are formed on the rigid body 20 as in Modification 1 shown in FIG. It may be formed. The first to fourth convex portions 21 to 24 are configured by protrusions that protrude radially outward from the outer peripheral surface of the rigid body 20 and extend linearly across both ends of the rigid body 20 in the center line direction. . The intervals between the first to fourth convex portions 21 to 24 are substantially equal intervals in the circumferential direction of the rigid body 20, but may be unequal intervals. Although the first to fourth convex portions 21 to 24 are provided in the first modification, the number is not limited to this, but the number of convex portions may be three or less, or five or more. May be.

  The first to fourth convex portions 21 to 24 are integrally formed with the rigid body 20, and accordingly, in the portion corresponding to the formation location of the first to fourth convex portions 21 to 24 on the inner peripheral surface of the rigid body 20. The first to fourth recesses 25 to 28 are formed, respectively. The 1st-4th convex parts 21-24 and the 1st-4th recessed parts 25-28 become a starting point of a deformation | transformation at the time of deform | transforming until the rigid body 20 becomes a 1st shape. That is, the portion of the rigid body 20 where the first to fourth convex portions 21 to 24 and the first to fourth concave portions 25 to 28 are formed is more easily bent than the other portions of the rigid body 20, and the rigid body When force is applied in the direction of crushing 20 in the radial direction, the portions where the first to fourth convex portions 21 to 24 and the first to fourth concave portions 25 to 28 are formed are deformed first. Thereby, the part between the 1st convex part 21 and the 2nd convex part 22 in the rigid body 20, the part between the 2nd convex part 22 and the 3rd convex part 23, the 3rd convex part 23, and the 4th convex part The manhole seismic joint 1 can be deformed until the first shape is obtained without substantially deforming the portion between the portion 24 and the portion between the fourth convex portion 24 and the first convex portion 21. . Further, by forming the first to fourth convex portions 21 to 24 and the first to fourth concave portions 25 to 28, the force required for the deformation of the rigid body 20 can be reduced.

  Further, as in Modification 2 shown in FIG. 8, the rigid body 20 may have a polygonal cross section. FIG. 8 shows a case where the cross section of the rigid body 20 is a hexagon, and therefore the first to sixth corner portions 20a to 20f are formed in the rigid body 20. When a force is applied in a direction in which the rigid body 20 is crushed in the radial direction, the first to sixth corner portions 20a to 20f become deformation starting points and are deformed before other portions. Thereby, the seismic joint 1 for manholes can be deformed until it becomes a 1st shape, hardly deforming the part corresponding to each side of the hexagon in the rigid body 20. In this modified example 2, the outer cylinder part 11 of the flexible member 10 is also in the shape of a hexagonal section. Further, the outer shape of the connecting portion 13 of the flexible member 10 is a hexagon corresponding to the shape of the outer cylinder portion 11.

  In addition, the cross section of the rigid body 20 does not need to be a hexagon and may be a polygon. A preferable shape in the cross section of the rigid body 20 is a polygonal shape having an even number of vertices such as a quadrangle, a hexagon, and an octagon.

  Although not shown, the deformation starting point portion of the rigid body 20 may be, for example, a thin wall portion or a notch portion provided in a part of the rigid body 20 in the circumferential direction.

  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 explained above, the seismic joint for manhole and the mounting method thereof according to the present invention can be used at the time of seismic repair of a sewer pipe, for example.

DESCRIPTION OF SYMBOLS 1 Seismic joint for manholes 10 Flexible member 11 Outer cylinder part 12 Inner cylinder part 13 Connection part 20 Rigid bodies 21-24 The 1st-4th convex part (deformation origin part)
100 manhole 101 opening 102 peripheral wall 200 sewer pipe

Claims (6)

It is provided between the peripheral wall portion of the manhole and the outer peripheral surface of the sewer pipe inserted into the peripheral wall portion, and connects the manhole and the sewer pipe and absorbs the relative displacement between the manhole and the sewer pipe. In manhole seismic joints with flexibility,
An inner cylinder fixed to the outer peripheral surface of the sewer pipe, an outer cylinder formed to surround the inner cylinder, and extending from the inner cylinder to the outer cylinder, the inner cylinder and the outer A flexible member having a water-stopping property having a connecting portion for connecting the cylindrical portion;
A cylindrical rigid body that is fixed to the outer peripheral surface of the outer cylindrical portion and fixed to the peripheral wall portion of the manhole, and is made of a member having higher rigidity than the flexible member;
The outer dimension of the manhole seismic joint is set to be larger than the diameter of the opening provided in the upper part of the manhole,
The seismic joint for manhole has a first shape deformed in a radial direction until an outer dimension thereof is equal to or less than a diameter of the opening of the manhole, and a shape or a deformation in which the first shape approximates a shape before deformation. A seismic joint for manholes, characterized in that the second shape is restored to the previous shape. In the earthquake resistant joint for manholes according to claim 1,
The rigid body is formed in a cylindrical shape,
A seismic joint for manholes, characterized in that the rigid body is provided with a deformation starting point portion which becomes a starting point of deformation when the rigid body is deformed to the first shape. In the seismic joint for manholes according to claim 2,
The deformation starting point is composed of a convex portion formed on the rigid body. In the earthquake resistant joint for manholes according to claim 1,
A seismic joint for manholes characterized in that the rigid body has a polygonal cross section. It is provided between the peripheral wall portion of the manhole and the outer peripheral surface of the sewer pipe inserted into the peripheral wall portion, and connects the manhole and the sewer pipe and absorbs the relative displacement between the manhole and the sewer pipe. In the installation method of the seismic joint for manholes with flexibility,
An inner cylinder part; an outer cylinder part formed so as to surround the inner cylinder part; and a connection part extending from the inner cylinder part to the outer cylinder part and connecting the inner cylinder part and the outer cylinder part. A flexible member with water-stopper,
A cylindrical rigid body made of a member that is fixed to the outer peripheral surface of the outer cylinder portion and is more rigid than the flexible member,
The manhole seismic joint is deformed in the radial direction so that the outer dimension of the manhole seismic joint is equal to or less than the diameter of the opening provided in the upper part of the manhole. After bringing it into the manhole from the opening,
Restore the shape of the above-mentioned seismic joint for manhole until it becomes a shape that approximates the shape before deformation or the shape before deformation,
Thereafter, the seismic joint for manholes is disposed at the end of the sewer pipe, the inner cylindrical portion of the flexible member is fixed to the outer peripheral surface of the sewer pipe, and the outer peripheral surface of the rigid body is the peripheral wall of the manhole. Mounting method for seismic joints for manholes, characterized by being fixed to the part. In the mounting method of the seismic joint for manholes of Claim 5,
A method for attaching a seismic joint for manholes, wherein the seismic joint for manholes is deformed starting from a deformation starting point provided on the rigid body when the seismic joint for manholes is deformed in a radial direction.

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