JP4374258B2 - Manhole-tube connection structure and connection method - Google Patents

Description

  The present invention relates to a connection structure and connection method between a manhole and a pipe body. Specifically, the connection between a newly installed manhole and a pipe body and the connection of a pipe body in an existing manhole is made with an earthquake resistant structure inside the manhole. The present invention relates to a connection structure and a connection method.

The connection between the manhole and the tube is fixed by filling the tube with a mortar between the outer peripheral surface of the tube and the inner surface of the drilling hole. .
However, when the connecting portion of the tubular body is fixed with respect to the manhole, it is impossible to follow the earthquake or the uneven settlement of the ground, and the tubular body is broken or broken at the connecting portion.

For this reason, since the Great Hanshin Earthquake a few years ago, not only new pipes were connected to the connection structure between manholes and pipes, but also existing pipes were being refurbished to make them earthquake resistant.
In newly established pipelines, depending on the method of forming the pipeline, it is possible to implement an earthquake resistant structure outside and inside the manhole, but in the case of existing pipelines, the roads are blocked, etc. In order to minimize traffic restrictions, it is necessary to carry out renovation work inside the manhole.

As a method for connecting the connecting portion between the manhole and the pipe body in the manhole with an earthquake resistant structure, there is a method previously proposed by the present applicant.
In this method, one side portion of the rubber socket is fitted and fixed to the outer side of the end portion of the tubular body inserted in the drilling hole of the manhole, and the other side portion of the rubber socket is larger than the outer diameter of the tubular body and is The metal collar having a diameter smaller than the inner diameter of the hole is fixed to the inner side (or the outer side) with an extension band (or a fastening band), and then the metal collar is pushed between the hole and the tubular body. The socket is bent and inverted, and then a mortar, resin seal, resin mortar, or other connecting member is injected between the outer peripheral surface of the metal collar and the inner surface of the drilled hole, and the two (manhole and metal collar) are connected and fixed. (For example, refer to Patent Document 1).

JP 2003-105788 A

  The rubber socket in the connection structure described in Patent Document 1 is fixed to the tube and then pushed into the drilling hole. The rubber socket is bent and inverted and bent into a substantially S-shaped cross section. And since a metal collar is located outside the outermost cylindrical portion, it is required that the space between the outer peripheral surface of the tubular body and the inner surface of the hole is wide. That is, it is required that the drilling diameter established in the manhole is larger than the outer diameter of the pipe body.

For example, when connecting a tubular body having an outer diameter of 700 mm to the No. 1 assembly person hole (inner diameter: 900 mm), the outer diameter of the metal collar fixed to the outside of the rubber socket bent in an S shape is at least the tubular body. An outer diameter of +70 mm or more is necessary, and the hole diameter is naturally increased to 790 mm or more accordingly. However, forming a large hole in the assembly hole having a small diameter greatly affects the strength of the manhole itself, and it is necessary to make the hole diameter as small as possible .

  The present invention has been made in view of the above-described problems of the prior art, and the problem is that a connection structure and a person who can make a seismic connection using a rubber socket without increasing the diameter of a drilling hole in an assembly type manhole. It is to provide a connection method in a hole.

The technical means taken by the present invention in order to achieve the above-described object is that a rubber socket, which is bent in a substantially U-shaped cross section, is formed on a side outer surface of a tubular body inserted into a drilling hole of a manhole body. Cover the inner tubular part facing the outside of the manhole body and fix it with the fastening band, and connect and fix the sleeve ring (metal collar) to the tip of the outer tubular part of the rubber socket, and the outer surface of the sleeve ring and the inner surface of the hole The sleeve ring and the manhole body are connected by filling a gap between the sleeve ring and the manhole body (claim 1).
The sleeve ring connected to the outer tubular portion of the rubber socket bent to have a substantially U-shaped cross section may be either the outer surface side or the inner surface side of the outer tubular portion. In the case of, fix with a fastening band.
Examples of the connecting member that fills the gap between the outer surface of the sleeve ring and the inner surface of the drilling hole include a resin sealant that changes into a rubbery elastic body after injection and changes to a rubber-like elastic body after injection, or mortar, resin-based mortar, and the like.

  According to the above means, the manhole and the pipe body are connected by the rubber socket, and the rubber socket is bent in a substantially U-shaped cross section, so that the flexibility is maintained, and the ground due to the earthquake and the uneven settlement of the ground It is possible to follow the fluctuations of the tube, prevent damage to the tube at the connection with the manhole, and maintain water tightness. Since the rubber socket is bent into a substantially U-shaped cross section, the outer diameter of the outer tubular portion is smaller than that of a conventional rubber socket bent into a substantially S-shaped cross section, and is thus connected and fixed to the outer tubular portion. The sleeve ring diameter may be smaller than that of the conventional product, and as a result, the hole diameter can be reduced.

In addition, it is preferable that an internal space defined by the rubber socket and the sleeve ring is filled with an elastically deformable filler (backup material). Examples of the elastically deformable filler include urethane foam and polystyrene foam.
With this configuration, it is possible to prevent the solid matter in the fluid flowing in the pipe line from entering the rubber socket (inside the U-shaped curve), thereby preventing the function of the rubber socket from being performed.

And the connection method to establish the above earthquake-resistant connection structure is:
(1) One side portion of a straight tubular rubber socket is connected to one side portion along the axial direction of the sleeve ring by a fastening band, and the other side portion of the rubber socket is projected to the opposite side of the sleeve ring.
(2) The other side portion of the rubber socket is folded back into the sleeve ring, and the folded end portion side is projected from the end surface of the sleeve ring.
(3) The folded rubber socket is placed on the outside of the tubular body inserted in the drilling hole of the manhole, and fixed with a fastening band.
(4) Pull the sleeve ring connected to the rubber socket from the inside of the manhole body to the installation position in the drilling hole.
(5) Fill the gap between the outer surface of the drawn sleeve ring and the inner surface of the drilling hole, and fix and cure.
(Claim 3).
With this connection method, the manhole and tube connection work can be completed inside the manhole.

According to the connection structure of the manhole and the tube of the present invention, the manhole and the tube can be connected by a flexible rubber socket, and the rubber socket is curved in a substantially U-shaped cross section. Therefore, the outer diameter of the outer tubular portion is smaller than that of a conventional rubber socket bent into a substantially S-shaped cross section, and as a result, the diameter of the sleeve ring connected to the outer tubular portion can also be reduced.
Therefore, the diameter of the hole to be opened in the peripheral wall of the assembly type manhole can be reduced, and the strength of the manhole can be secured.
Further, according to the configuration of the second aspect, it is possible to prevent the solid matter in the fluid flowing in the pipe line from entering the rubber socket (inside the U-shaped curve) and the function of the rubber socket from being lost. Thereby, a stable earthquake-resistant structure can be maintained over a long period of time.
Further, according to the connection method of the third aspect, the operation of connecting the manhole and the tube body with the flexible rubber socket can be completed inside the manhole. Therefore, it is not necessary to dig up the soil around the manhole, and the construction period can be shortened and the construction cost can be reduced.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 are cross-sectional views showing a connection structure between a manhole body (circular) and a tubular body. In the figure, 1 is an assembly-type manhole body, 2 is a pipe made of a concrete fume pipe connected to the manhole body 1 and the like. The pipe body 2 is inserted into a drilling hole 3 opened in the peripheral wall 1a of the manhole body 1 at the side end, and has a substantially U-shaped cross section outside the pipe body 2 in the drilling hole 3. The bent rubber socket 4 covers the inner tubular portion 4a with the bent portion 4 'facing the outer side of the manhole body 1, and is fastened and fixed by the tightening band 5. A metal is placed on the inner side of the outer tubular portion 4b of the rubber socket 4. A sleeve ring 6 made of metal is connected and fixed by a tightening band 7, and a connecting member 8 is filled and connected and fixed in a gap a between the outer surface of the sleeve ring 6 and the inner surface of the hole 3.

The assembly-type manhole body 1 is a well-known structure in which concrete cylinders are stacked in a multi-stage shape, and a hole 3 having a predetermined diameter is opened in advance on the peripheral wall of the cylinder to which the tube 2 is connected. Yes.
The tube body 2 inserted and connected to the hole 3 of the manhole body 1 is formed in an arc surface so that the end surface on the insertion side is substantially flush with the inner peripheral surface of the manhole body 1. When the manhole body is rectangular, the end face on the tube insertion side may be a straight surface.

  The rubber socket 4 is processed into a cylindrical shape (ring shape), and is formed into a substantially U-shaped cross section by folding one end of the cylindrical body inward and projecting from the other end (FIG. 3, FIG. 4). Although not shown in the drawings, the surface of the tubular body 2 that comes into contact with the outer peripheral surface is formed with a chevron having a cross-sectional shape, thereby ensuring sealing performance (watertightness). A groove or a band is provided at the position where the rubber socket 4 is tightened with the tightening band 5 with respect to the tube body 2 and the position where the rubber band 4 is tightened with the tightening band 7 with respect to the sleeve ring 6 so that the tightening bands 5, 7 are not displaced. A ridge is formed so as to sandwich the.

The sleeve ring 6 is a metal ring (cylindrical) having rigidity and is connected to the manhole body 1 via a connecting member 8, and one end thereof is inserted into the hole 3 of the manhole body 1. The other end connected to the outer tubular portion 4b of the rubber socket 4 is formed in a straight surface.
The connecting member 8 that fills the gap between the inner surface of the hole 3 of the manhole body 1 and the outer surface of the sleeve ring 6 is mortar, resin-based mortar, or resin-based sealing material. The sleeve ring 6 is connected and integrated, and the sleeve ring 6 becomes a part of the manhole body 1.

Next, the connection method (construction procedure) of the connection structure described above will be described.
First, as shown in FIG. 3, one side of the rubber socket 4 (the side that becomes the outer tubular portion 4 b) is placed on the outer peripheral surface of one side of the sleeve ring 6, and tightened with a tightening band 7 from the outer side. The ring 6 is connected and fixed.
Next, the other side portion of the rubber socket 4 (the side that becomes the inner tubular portion 4a) is bent inward, and its end portion is projected through the sleeve ring 6 to the opposite side, as shown in FIG. Is bent into a substantially U-shaped cross section. The length by which the inner tubular portion 4a of the rubber socket 4 protrudes from the end face of the sleeve ring 6 is a length necessary for attaching the fastening band 5 to the tube body 2, for example, about 30 mm.

  The inner tubular portion 4a of the rubber socket 4 formed as shown in FIG. 4 is connected to the tubular body 2 inserted into the hole 3 of the manhole body 1 with the bent portion 4 'facing the outside of the manhole body 1 in the manhole body 1. Cover the outside of the side. At this time, the sleeve ring 6 connected to the outer tubular portion 4b of the rubber socket 4 is shown in FIG. 5 so as not to obstruct the operation of tightening and fixing the inner tubular portion 4a to the tube body 2 with the fastening band 5. As shown, escape toward the outside of the manhole body 1.

In this state, the inner tubular portion 4a is tightened and fixed from the outside with the tightening band 5, and one side portion of the rubber socket 4 is connected and fixed to the tube body 2, and then the sleeve ring 6 is inserted into the hole 3 of the manhole body 1. As shown in FIG. 6, the end of the sleeve ring 6 is aligned with the inner surface of the manhole.
Then, the connecting member 8 is injected and filled in the gap between the outer surface of the sleeve ring 6 and the inner surface of the hole 3, the connecting member 8 is cured, and the sleeve ring 6 is integrated with the manhole body 1 through the connecting member 8. The Further, the inner space defined by the sleeve ring 6 connected to the inner tubular portion 4a and the outer tubular portion 4b of the rubber socket 4 is filled with an elastically deformable filler 9, such as foamed urethane or polystyrene foam, for connection work. Complete (see FIGS. 1 and 2).
In addition, in the space behind the sleeve ring 6 and the rubber socket 4 on the outer side of the manhole body 1, similarly to the filler 9, a filler 9 ′ such as urethane foam or polystyrene foam may be injected and filled. In this case, the filler 9 ′ is filled before filling the connecting member 8.

With the above connection structure, the flexible rubber socket 4 connected to the outside of the tube body 2 is bent into a substantially U-shaped cross section, and the sleeve ring 6 is connected and fixed to the outer tubular portion 4b. When the gap between the sleeve ring 6 and the inner tubular portion 4a is X, the gap X is a metal collar (sleeve) connected to a rubber socket having a substantially S-shaped section in the prior art (Japanese Patent Laid-Open No. 2003-105788). X ′> X compared to the gap X ′ between the pipe connecting tubular portion of the rubber socket and the rubber socket.
For example, when a tube body having an outer diameter of 700 mm (inner diameter: 600 mm) is connected to the No. 1 assembly person hole (inner diameter: 900 mm) with the above structure, the outer diameter of the sleeve ring 6 (plate thickness: 4.5 mm) is about 750 mm. can do. In particular, it is effective in the case of the maximum assembly hole mounting size. Therefore, the hole diameter can be reduced in comparison with the prior art.

  Further, the length of the rubber socket 4 is substantially U-shaped compared to the conventional rubber socket bent into a substantially S-shaped cross section, so that the length of the rubber socket 4 may be approximately half, thereby reducing the cost of the rubber socket. Can do.

  Conventionally, it is possible to construct an earthquake-resistant connection structure even in a small-diameter assembly type human hole, which has not been able to perform earthquake-proofing work from the inside of a manhole.

The cross-sectional view which shows the connection structure of this invention. FIG. Sectional drawing which connected the rubber socket to the sleeve ring. Sectional drawing which folded the one side part of the rubber socket inside, and made the cross-section U-shaped. Sectional drawing which shows the state which set the rubber socket to the tubular body. Sectional drawing of the state which fixed the rubber socket to the pipe body and retracted the sleeve ring into the drilling hole.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Manhole body 2 ... Tube 3 ... Drilling hole 4 ... Rubber socket 4a ... Inner tubular part 4b ... Outer tubular part 5, 7 ... Fastening band 6 ... Sleeve ring 8 ... Connecting member 9 ... Filler

Claims (3)

A rubber socket bent in a substantially U-shaped cross section is formed on the outer surface of the side of the tubular body inserted into the drilling hole of the manhole body, and the inner tubular portion is covered with the bent portion facing the outside of the manhole body with a tightening band. The sleeve ring is connected and fixed to the tip of the outer tubular portion of the rubber socket, and the sleeve ring and the manhole body are connected by filling a connecting member in the gap between the outer surface of the sleeve ring and the inner surface of the drilling hole. Connecting structure of manhole and tube. 2. The manhole-tube connection structure according to claim 1, wherein an internal space defined by the rubber socket and the sleeve ring is filled with an elastically deformable filler. A method of connecting a manhole and a tubular body with an earthquake resistant structure,
(1) One side portion of a straight tubular rubber socket is connected to one side portion along the axial direction of the sleeve ring by a fastening band, and the other side portion of the rubber socket is projected to the opposite side of the sleeve ring.
(2) The other side portion of the rubber socket is folded back into the sleeve ring, and the folded end portion side is projected from the end surface of the sleeve ring.
(3) The folded rubber socket is placed on the outside of the tubular body inserted in the drilling hole of the manhole, and fixed with a fastening band.
(4) The sleeve ring connected to the rubber socket is pulled into the hole from the inside of the manhole body.
(5) Fill the gap between the outer surface of the drawn sleeve ring and the inner surface of the drilling hole, and fix and cure.
A method for connecting a manhole and a tube.

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