JP4887211B2 - Connection structure between manhole and sewage main - Google Patents

Description

  The present invention relates to a connection structure between a manhole and a sewer main.

The other end of the cylindrical flexible body is fixed to the cylindrical body, and by tightening the fastening band on one end side from the inside of the shaft, the cylindrical flexible body is clamped and fixed to the outer periphery of the pipe, and the outer periphery of the cylindrical flexible body is fixed. A water stop flexible joint for manhole structure fixed by a manhole filler is known (see Patent Document 1).
Japanese Patent No. 3597789

The water stop flexible joint for the manhole structure of Patent Document 1 needs to tighten the tightening band from the shaft.
That is, in order to tighten the tightening band, it is necessary to insert a screwdriver between the circular tube and the cylindrical flexible body, the inner diameter of the cylindrical body must be increased, and the mounting hole is increased. Therefore, the strength of the manhole is reduced and it is uneconomical.

  An object of the present invention is to provide a connection structure between a manhole and a sewage main pipe that is excellent in earthquake resistance and simple in construction work.

(About claim 1 )
The manhole is embedded in the shaft and has a circular mounting hole on the side wall.
The sewage main having a circular cross section is laid in a horizontal hole communicating with the shaft and faces the mounting hole.

The flexible joint has a collar with a constant diameter that fits the end of the sewage main pipe propelled into the mounting hole with a flange extending outward from the cylinder and a water stop protrusion protruding from the inner wall surface toward the cylinder inward. A flexible cylindrical body having a cylindrical portion, a folded portion extending outwardly from the cylinder, and a large cylindrical portion having an equal diameter extending in a direction away from the inner wall of the shaft, and a rear portion of the circular pipe closer to the inner wall of the shaft is a large cylindrical portion An equal-diameter steel circular pipe that is externally fitted and extends so as to surround the small-diameter cylindrical portion, a rigid ring that is fitted to the outer periphery of the small-diameter cylindrical portion, and a fastener that is attached to the outer periphery of the large-diameter cylindrical portion Become. This flexible joint is pushed into the gap between the outer periphery of the sewage main pipe and the inner wall of the mounting hole from within the manhole.
The sealing material is filled in the gap between the joint outer periphery and the mounting hole inner wall.

The connection between the manhole and the sewage main is as follows.
The flexible joint is manufactured in the factory as follows. A rigid ring is fitted on the outer periphery of the small cylindrical part of the flexible cylindrical body across the flange, and the rear part of the steel circular tube is fitted on the large cylindrical part of the flexible cylindrical body, and the large cylindrical part The steel circular pipe is fixed to the large-diameter cylindrical portion of the flexible cylindrical body by tightening a fastener attached to the outer periphery of the steel cylinder.

Push the sewage main in the side hole and let it face the mounting hole.
The flexible joint assembled at the factory is transported to the construction site and pushed into the gap between the outer periphery of the sewage main pipe and the inner wall of the mounting hole from within the manhole.
Fill the gap between the outer periphery of the joint and the inner wall of the mounting hole with a sealing material.
When the sealing material dries, the flexible joint is fixed to the mounting hole of the manhole, and the sewage main pipe has flexible performance due to the flexible joint.

The connection between the manhole of claim 1 and the sewage main has the following advantages.
Since the flexible joint is assembled at the factory, at the construction site, the flexible joint is pushed into the gap between the outer periphery of the sewage main pipe and the inner wall of the mounting hole, and the gap between the outer periphery of the joint and the inner wall of the mounting hole is inserted. Fill with sealant and wait for the sealant to dry.
When the sealing material dries, the flexible joint is fixed to the mounting hole of the manhole, and the sewage main pipe has flexible performance due to the flexible joint. That is, since it is not necessary to tighten a tightening band or the like from the manhole, construction work at the site can be easily performed, and labor and time are not required.

  In addition, because a water stop projection protrudes from the inner wall surface of the small cylindrical portion of the flexible cylindrical body to the inside of the cylinder, and a rigid ring is fitted on the outer periphery of the small cylindrical portion of the flexible cylindrical body When the flexible joint is pushed into the gap, the water-stopping protrusion is pressed against the sewage main pipe to obtain water-stopping performance. Even if the shape of the sewage main pipe is slightly deformed, the rigid ring prevents the water stop protrusion from being pressed against the sewage main pipe, and the inner periphery of the front part of the small-diameter cylindrical portion is in close contact with the outer periphery of the sewage main pipe. Aqueousness can be secured.

  Since the flexible cylindrical body and the sewage main pipe are not adhered with an adhesive, even if the flexible joint does not fit, the posture can be corrected and re-fitted. In addition, since the flexible cylindrical body and the sewage main pipe are not bonded with an adhesive, it can be constructed even in the extremely cold period or the extremely hot period.

  Since the small-diameter cylindrical portion of the flexible cylindrical body is provided with the flange extending in the direction outside the cylinder, it is possible to prevent the rigid ring fitted into the outer periphery of the front portion of the small-diameter cylindrical portion from coming off.

(About claim 2 )
Since the sewage main pipe is made of resin, the pipe surface is smooth.
When the flexible joint is pushed into the gap, the small-diameter cylindrical portion is constrained by the rigid ring, and the water-stopping protrusion presses the sewage main pipe having a smooth surface, so that water can be reliably stopped.
Even if the shape of the sewage main pipe is slightly deformed, the rigid ring ensures that the water stop projection is pressed against the sewage main pipe and the inner periphery of the small-diameter cylindrical portion is in close contact with the outer periphery of the sewage main pipe. Aqueousness can be secured.

  The connection structure between the manhole and the sewage main pipe consists of a small-diameter cylindrical part having a ridge and a water-stopping projection, and a small-diameter cylindrical part that fits the end of the sewage main pipe, a folded-back part extending in the cylinder direction, and a large-diameter cylindrical part A flexible cylindrical body, a steel circular pipe having an equal diameter that extends so as to surround the small-diameter cylindrical portion, and a rigid ring that is fitted to the outer periphery of the small-diameter cylindrical portion. And a flexible joint consisting of a fastener attached to the outer periphery of the large-diameter cylindrical portion is pushed into the gap between the outer periphery of the sewage main pipe and the inner wall of the mounting hole from the inside of the manhole, and between the outer periphery of the joint and the inner wall of the mounting hole. The gap is filled with a sealing material.

If the flexible joint is assembled at the factory, the flexible joint is pushed into the gap, the sealing material is filled into the gap, and the sealing material is waited for to dry.
When the sealing material dries, the flexible joint is fixed to the mounting hole of the manhole, and the sewage main pipe has flexible performance due to the flexible joint. That is, since it is not necessary to tighten a tightening band or the like from the manhole, construction work at the site can be easily performed, and labor and time are not required.
The sewage main can be fixed in the mounting hole of the manhole.
In addition, since a water stop protrusion protrudes from the inner wall surface of the small cylindrical portion of the flexible cylindrical body to the inside of the cylinder and a rigid ring is fitted on the outer periphery of the small cylindrical portion, the flexible joint is When pressed, the water-stopping projection is pressed against the outer peripheral surface of the sewage main pipe, so that water-stopping is obtained.

A first embodiment (corresponding to claims 1 and 2 ) of the present invention will be described with reference to FIGS.
As shown in the figure, the manhole-sewage main connection structure A includes a manhole 1, a sewage main pipe 2 facing the mounting hole 11, and a gap s between the outer periphery of the sewage main pipe 2 and the inner wall of the mounting hole 11. And a mortar m (sealing material) filled in a gap k between the outer periphery of the flexible joint j and the inner wall of the mounting hole 11.

The manhole 1 (made of concrete) has a substantially circular mounting hole 11 in the side wall 12 and is embedded in the shaft 13.
The sewage main pipe 2 (made of vinyl chloride) has a circular cross section and is laid in a horizontal hole communicating with the shaft 13.

The flexible joint j includes a main body rubber 3 (flexible cylindrical body), an equal-diameter circular tube 4 (steel circular tube), an iron ring 5 (rigid ring), and a stainless steel band 6 (clamp). Consists of.
The main rubber 3 has a small-diameter cylindrical portion 31 having an equal diameter, a folded portion 32 extending in the direction outside the cylinder, and a large-diameter cylindrical portion 33 having an equal diameter.

The small-diameter cylindrical portion 31 of the main rubber 3 is integrally provided with a flange 31a extending outward from the cylinder and a rectangular water stop protrusion 31b protruding from the inner wall surface toward the inside of the cylinder. The end portion 21 of the main pipe 2 is externally fitted.
The large-diameter cylindrical portion 33 of the main rubber 3 has approximately half the size of the small-diameter cylindrical portion 31 and extends in a direction away from the shaft inner wall.

  The circular pipe 4 is a cylindrical pipe whose outer diameter is smaller than the inner diameter of the mounting hole 11 and whose cylinder inner diameter is larger than the outer diameter of the sewage main pipe 2. The side close to the inner wall of the shaft 13 is defined as the rear side. The circular tube 4 has a circular tube rear portion that is closer to the inner wall of the shaft and is fitted on the large-diameter cylindrical portion 33 of the main rubber 3, and a circular tube front portion that extends forward so as to surround the small-diameter cylindrical portion 31.

The iron ring 5 is fitted on the outer periphery of the small diameter cylindrical portion 31 of the main rubber 3.
The stainless steel band 6 is a stainless steel band having a structure in which the diameter of the stainless steel belt is reduced when a screw is turned. The stainless steel band 6 is attached to a concave groove formed on the outer periphery of the large-diameter cylindrical portion 33 of the main rubber 3, and the rear portion of the circular tube 4 is screwed to the large-diameter cylindrical portion 33 of the main rubber 3 in the factory. Are fixed.

Next, a construction method of the connection structure A between the manhole and the sewage main pipe using the flexible joint j will be described.
(1) The flexible joint j is manufactured in the factory according to the following procedure.
The steel ring 5 is fitted on the outer periphery of the small-diameter cylindrical portion 31 of the main body rubber 3 across the flange 31a, and the rear portion of the circular tube 4 is externally fitted on the large-diameter cylindrical portion 33 of the main rubber 3, so that the large-diameter cylindrical portion 33 is fitted. The rear end of the circular tube 4 is fixed to the large-diameter cylindrical portion 33 of the main rubber 3 by turning the screw of the stainless steel band 6 attached to the concave groove on the outer periphery of {circle over (3)} (see FIGS. 2A and 2B).

(2) The sewage main pipe 2 is propelled in the side hole so that the end 21 faces the manhole 1.
The flexible joint j manufactured at the factory is transported to the construction site, and the flexible joint j is pushed into the gap s between the inner wall of the mounting hole 11 and the sewage main pipe 2 with the turning portion 32 first. {See (a) and (b) of FIG. 3}. At this time, the gap s is formed by the water stop projection 31b protruding downward from the inner wall surface of the small diameter cylindrical portion 31 of the main rubber 3 and the iron ring 5 fitted on the outer periphery of the front portion of the small diameter cylindrical portion 31. When pushed in, the water stop protrusion 31 b presses the outer periphery of the sewage main pipe 2.

(3) The mortar m is filled into the gap k between the outer periphery of the flexible joint j and the inner wall of the mounting hole 11 from the manhole 1.
When the mortar m is dried, the flexible joint j is fixed to the mounting hole 11 of the manhole 1. However, the flexible joint j and the sewage main pipe 2 have flexibility due to the main body rubber 3.

The connection structure A between the manhole and the sewage main in this embodiment has the following advantages.
Since the flexible joint j is assembled at the factory and transported to the construction site, the flexible joint j from the manhole 1 is inserted into the gap s between the outer periphery of the sewage main pipe 2 and the inner wall of the mounting hole 11 at the construction site. The sewage main pipe 2 can be easily fixed to the mounting hole 11 of the manhole 1 simply by pushing in and filling the gap k between the outer periphery of the joint and the inner wall of the mounting hole 11 with the mortar m. That is, since it is not necessary to tighten a fastener (stainless steel band or the like) from the manhole 1, construction work at the site can be easily performed, and labor and time are not required.

  Since the water stop protrusion 31b protrudes from the inner wall surface of the small diameter cylindrical portion 31 of the main rubber 3 to the inside of the cylinder, and the iron ring 5 is fitted on the outer periphery of the small diameter cylindrical portion 31, the flexible joint j is When pushed into the gap s, the water stop protrusion 31b presses against the sewage main pipe 2, so that water stop is obtained. Even if the shape of the sewage main pipe 2 having a circular cross section is slightly deformed, the water stop projection 31b is pressed against the sewage main pipe 2 by the iron ring 5 so that the inner periphery of the small diameter cylindrical portion 31 is sewer main. Since it adheres closely to the outer periphery of the tube 2, it is possible to ensure water-stopping.

  Since the main rubber 3 and the sewage main pipe 2 are not bonded with an adhesive, even if the flexible joint j fails to be fitted, posture correction and refit can be performed any number of times. Further, since the main rubber 3 and the sewage main pipe 2 are not bonded with an adhesive, the construction can be performed even in the extremely cold season or the extremely hot season.

  Since the small diameter cylindrical portion 31 of the main body rubber 3 is provided with the flange 31a extending in the cylinder outward direction, it is possible to prevent the iron ring 5 fitted on the outer periphery of the small diameter cylindrical portion 31 from coming off.

The connection structure between the manhole and the sewage main pipe of the present invention includes the following embodiments in addition to the above-described embodiments.
a. In order to make it easy to attach the main rubber 7 to the sewage main pipe 2, the end surface of the folded portion 72 may be tapered. In addition, 71a is the protrusion for water stop, 72 is a folding | returning part (corresponding to FIG. 4).
b. The material of the rigid ring may be plastic other than iron.
c. The iron ring 5 (rigid ring) may not be fitted around the entire circumference of the small-diameter cylindrical portion 71 of the main rubber 7, but only the outer periphery of the front portion (see FIG. 4).
d. As shown in FIG. 5, the connection structure between the manhole and the sewer main may be a structure in which the main rubber 8 does not have a folded portion. Reference numeral 81 is an expansion ring, 82 is a rigid ring, and 4 is a circular pipe.

It is sectional drawing for demonstrating the connection structure of the manhole based on Example 1, and a sewer main. In the connection structure of the manhole and the sewage main pipe of Example 1, (a) is sectional drawing which shows the place which attaches a circular pipe and an iron ring to a main body rubber, (b) is a cross section of the flexible joint which attached them FIG. In the connection structure of the manhole and the sewage main pipe of Example 1, (a) is sectional drawing which shows the place which pushes a flexible joint in a clearance gap, (b) is sectional drawing which shows the place which pushed a flexible joint in the clearance gap. is there. It is sectional drawing for demonstrating the flexible joint which concerns on the modification of the connection structure of a manhole and a sewer main. It is sectional drawing for demonstrating the flexible joint which concerns on the modification of the connection structure of a manhole and a sewer main.

1 Manhole 2 Sewage main 3, 7, 8 Body rubber (flexible cylinder)
4 circular pipe (steel circular pipe)
5, 82 Iron ring (rigid ring)
6 Stainless steel band (clamp)
DESCRIPTION OF SYMBOLS 11 Mounting hole 12 Side wall 13 Vertical shaft 31b, 71a Water stop protrusion 31, 71 Small-diameter cylindrical part 32, 72 Folding part 33 Large-diameter cylindrical part A Connection structure of manhole and sewage main pipe j Flexible joint s Gap k Gap m Mortar (sealant)

Claims (2)

A manhole that has a circular mounting hole on the side wall and is buried in the shaft,
A sewage main pipe with a circular cross-section facing the mounting hole, laid in a horizontal hole communicating with the vertical shaft,
A flexible joint to be pushed from the manhole into the gap between the outer periphery of the sewage main pipe and the inner wall of the mounting hole;
A connection structure between a manhole having a sealing material filled in a gap between the outer periphery of the joint and the inner wall of the mounting hole and a sewage main pipe,
The flexible joint is
A small-diameter cylindrical portion having an equal diameter having a flange extending outwardly from the cylinder and a water-stop projection protruding from the inner wall surface toward the inside of the cylinder and externally fitting the end of the sewage main pipe propelled into the mounting hole A flexible cylindrical body having, in order, a folded portion extending in the direction outside the cylinder, and a large-diameter cylindrical portion having the same diameter extending in a direction away from the inner wall of the shaft,
A steel circular pipe with an equal diameter extending so as to surround the small-diameter cylindrical portion, with the rear portion of the circular tube closer to the inner wall of the shaft being fitted outside the large-diameter cylindrical portion,
A rigid ring fitted on the outer periphery of the small-diameter cylindrical portion;
A connection structure between a manhole and a sewage main pipe, comprising a fastener attached to the outer periphery of the large-diameter cylindrical portion. The connection structure between the manhole and the sewage main according to claim 1, wherein the sewage main is made of resin.

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