JPH09242967A - Rubber manhole joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rubber manhole joint which provides a large degree of freedom in the mounting and construction of a sewerage pipe to a manhole and is not affected by an earthquake and changes of the ground after the construction. SOLUTION: A cylindrical part 1 in which a sewerage pipe is inserted is integrated through a disc like collar part 3 which is provided with a diameter expansion part 2 which is expanded in the radial direction at a terminal of the cylindrical part 1 and is brought into contact with a side wall of a manhole and a bellows part 4 having a cross section in S-shape. The diameter expansion part 2 and the bellows part 4 are on a manhole non-contact face side of the collar part 3 and do not protrude at all on a manhole contact face side of the collar part 3. Even if a necessity that the sewerage pipe is made eccentric after the collar part of a joint is fixed on the side wall of the manhole occurs, the bellows part is elongated and the diameter expansion part is expanded to move the sewerage pipe in the vertical direction. Moreover, even if changes of the ground occur after the construction and the sewerage pipe becomes eccentric and is inclined, it is possible to prevent the peeling of the collar part and the cylindrical part due to the action of the diameter expansion part and the bellows part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber manhole joint used at a joint between a concrete manhole for sewerage and a sewer pipe. More specifically, the present invention relates to a rubber manhole joint with a high degree of freedom in the construction of sewer pipes.

[0002]

2. Description of the Related Art Conventionally, a rubber manhole joint has a cylindrical portion 14 into which a sewer pipe is inserted, as shown in FIG.
And a concrete manhole 15 to be brought into contact with a concrete manhole are integrally formed, a fastening fixing jig 17 for fixing a sewer pipe is attached to the cylindrical portion 14, and a flange 15 is formed on a concrete manhole. A structure having a bonding agent 18 for fixing is used. Sewer pipe tightening fixing jig 17 and flange 15 of the cylindrical portion 14
The contact surface of the concrete manhole has a water blocking property, and it has a structure that prevents the leakage of sewage and the intrusion of groundwater when the mortar part that fixes the concrete manhole and the sewer pipe is destroyed by external force. Has become.

[0003]

However, in the above-mentioned prior art, the effect is exerted when the used portion of the rubber manhole joint is just as designed, and there is a construction error and a post-construction error. When a change with time or the like occurred, there were the following problems.

(1) An annular protrusion 16 protruding from the contact point between the cylindrical portion 14 and the collar portion 15 toward the manhole contact surface side of the collar portion 15.
Is provided, and the annular protrusion 16 is located in the space between the manhole drilling portion and the outer surface of the sewer pipe during construction. At the construction site, the manhole drilling portion 21 and the sewer pipe 19 may need to be largely eccentric to be constructed as shown in FIG. 8, but in such a case, the annular projecting portion 16 is indicated by a dotted line. Since the part (lower side in FIG. 8) contacts the manhole drilling part 21 and the sewer pipe cannot be positioned, for example, the annular projecting part 16 is cut off or the drilling part 21 with which the projecting part 16 abuts is extremely cut. Troublesome repair work is required.

(2) The contact point between the cylindrical portion 14 and the collar portion 15 is T
Since the cylindrical portion 14 and the flange portion 15 have a fixed positional relationship with each other because of the V-shaped cross-sectional structure, after the flange portion 15 is attached to the side wall of the concrete manhole 20, it is attached to the cylindrical portion 14. It is impossible to correct the position of the sewer pipe 19 thus obtained. That is, in the case of a general rubber manhole joint installation, from the installation of the rubber manhole joint to the mortar construction of the joint between the manhole drilling portion 21 and the sewer pipe, a gradient inspection of the sewer pipe is performed. Even if this inspection finds a defect that requires position correction,
Since the position of the sewer pipe with respect to the manhole drilling portion 21 is fixed by the attachment of the collar portion 15 to the side wall of the manhole 20, the position cannot be corrected, and therefore the rubber manhole joint must be attached and reconstructed.

(3) When the sewer pipe 19 is eccentric to the manhole drilling portion 21 due to the destruction of the mortar portion due to an earthquake or uneven settlement after construction, the collar portion 1
A large external force due to eccentricity is applied to the joint between 5 and the side wall of the concrete manhole 20, and the joint is peeled off, which causes leakage of sewage and intrusion of groundwater and the like.

The present invention has been made in view of the problems of the prior art as described above, and its purpose is to increase the degree of freedom of installation construction of a sewer pipe to a manhole, and to prevent earthquakes and secular change after construction. It is to provide a rubber manhole joint that is not easily affected.

[0008]

A rubber manhole joint according to the present invention will be described with reference to FIG. 1. A cylindrical portion 1 into which a sewer pipe is inserted has a diametrically enlarged portion 2 that radially expands at its end.
Is provided, and is integrated via a disc-shaped collar portion 3 that abuts (adheres) to the side wall of the manhole via a bellows portion 4 having an S-shaped cross-sectional shape, and the expanded diameter portion 2 The bellows portion 4 and the bellows portion 4 do not project to the manhole contact surface side of the collar portion 3 in other words, in other words, the bellows portion 4 is provided so as to be located closer to the manhole non-contact surface side than the collar portion 3. .

The material of the rubber manhole joint used in the present invention is not particularly limited, and synthetic rubber such as SBR, EPDM, CR, NBR and IIR can be mentioned.

The expanded diameter portion 2 provided at the end of the cylindrical portion 1 holds the cylindrical portion 1 fixed to the sewer pipe by the tightening and fixing jig 6 and is subjected to various stresses. Even so, it functions to prevent separation of the cylindrical portion 1 from the sewer pipe.

Further, the bellows portion 4 integrally connecting the expanded diameter portion 2 and the disc-shaped collar portion 3 naturally allows the sewer pipe to move with respect to the manhole drilling portion, and thus the collar portion 3 Prevents peeling from the manhole. The bellows portion 4 is a cross section 1 in FIG.
Only two mountains are provided, but two or more mountains may be provided.

The enlarged diameter portion 2 and the bellows portion 4 must be provided so as to be located closer to the manhole non-contact surface side than the collar portion 3. (When the disk-shaped collar portion 3 is formed into a curved surface, it must be provided closer to the manhole non-contact surface side than the top portion 3a of the collar portion 3. See FIG. 4.)

The reason for this is that, when both are mounted on the manhole drilling part when they project from the collar part 3 toward the manhole abutting surface side, both are located in the gap between the sewer pipe and the manhole drilling part. This is because the movable range of the sewer pipe during construction is narrowed and the construction efficiency is reduced.

When the expanded diameter portion 2 and the bellows portion 4 are in the above-mentioned positional relationship, even if the sewer pipe and the manhole drilling portion cannot be aligned at the time of construction, the sewer pipe and The sewer pipe can be freely eccentrically laid by expansion and contraction of the bellows portion 4 within a gap range between the drilled portion,
Further, since the position of the sewer pipe can be corrected by the same action even after the collar portion 3 is fixed to the manhole side wall, the annular projection 16 is cut off as in the prior art, or the manhole drilling portion corresponding to the projection 16 is formed. There is no need for very troublesome repair work such as 21 digging.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings, but it goes without saying that the present invention is not limited to the embodiments.

FIG. 1 is a vertical half sectional view of a rubber manhole joint of the present invention. Reference numeral 1 denotes a cylindrical portion into which a sewer pipe is inserted, and a diametrically expanded portion 2 that expands in the radial direction of the cylindrical portion 1 at its end.
Is provided. Reference numeral 3 is a disc-shaped brim portion fixed to a side wall of a concrete manhole (hereinafter referred to as a manhole). A bonding agent 5 is applied to the manhole contact surface side of the collar portion 3, and a release paper such as a resin film is usually attached to the surface of the bonding agent 5. At the time of use, the film is peeled off to fix the collar portion 3 to the side wall of the manhole. Various materials are used as the bonding agent 5, and a preferable adhesive is a butyl rubber-based, acrylic-based, or acrylic-epoxy-based adhesive that is excellent in waterproofness and impact resistance.

Further, the shape of the collar portion 3 may be a curved surface as shown in FIG. 3 in addition to the flat plate shape as shown in FIG. That is, as shown in FIG. 4, when it is fixed to the side wall of the circular manhole, the cross section may have an arc shape.

Reference numeral 4 is a bellows portion which is provided between the end portion of the expanded diameter portion 2 and the collar portion 3 and integrally connects them, that is, by integrally molding. (See Fig. 2)

As can be seen from FIGS. 1, 3 and 4, the enlarged diameter portion 2 and the bellows portion 4 are provided so as to project toward the manhole non-contact surface side of the collar portion 3, and on the manhole contact surface side. It is not protruding at all. That is, the expanded diameter portion 2 and the bellows portion 4 are provided at positions higher than the surface of the collar portion 3 on which the bonding agent 5 is applied, on the opposite side.

This will be described in more detail with reference to FIG. FIG. 5 is a vertical half sectional view showing a standard construction state in which the sewer pipe 10 and the joint are fixed to the manhole 11, but the enlarged diameter portion 2 and the bellows portion 4 are shown.
Is at a position (left side in the drawing) higher than the surface of the collar portion 3 to which the bonding agent 5 is applied, that is, the outer surface of the manhole 11. Therefore, it can be understood that there is no concern that both of them enter the gap between the sewer pipe 10 in which the mortar 13 is sealed and the manhole drilling portion 12.

Reference numeral 6 denotes a tightening fixing jig (hereinafter referred to as a fixing jig) mounted on the outer peripheral surface of the cylindrical portion 1. After the sewer pipe 10 is inserted into the cylindrical portion 1, the sewer pipe 10 and the cylindrical portion 1 are fixed by tightening the fixing jig, and the leakage of sewage and the intrusion of groundwater or the like from the gap between the two are prevented. Retained.

Reference numeral 7 denotes annular rib-shaped jig guides provided on both sides of the fixing jig 6. Providing the jig guide 7 facilitates positioning when the fixing jig 6 is attached.
Reference numeral 8 is a bonding agent applied to the inner peripheral surface of the cylindrical portion 1 (FIG. 1). The bonding agent 8 is not always necessary, but by applying it, the adhesion between the cylindrical portion 1 and the sewer pipe is further improved. When the bonding agent guide 9 is provided in the same manner as described above, the positioning of the bonding agent 8 becomes easy.

FIG. 6 is a longitudinal sectional view showing a state before the mortar is fixed, in which the sewer pipe 10 is eccentrically inserted into the drilled portion 12 of the manhole 11 and before the mortar is fixed. In this example, after fixing the collar portion 3 of the joint to the side wall of the manhole 11, the sewer pipe has to be eccentric because of the gradient of the sewer pipe 10. In this case, the upper bellows portion 4 in the drawing
Is expanded and the expanded diameter portion 2 is expanded, thereby allowing the sewer pipe 10 to move downward and supporting it. Furthermore, the stress applied to the cylindrical portion 1 is relieved by expanding the expanded diameter portion 2,
Peeling of the cylindrical portion 1 from the sewer pipe 10 is prevented.
Therefore, stable water stop is maintained.

On the other hand, in the state of FIG. 5, that is, in the state where the sewer pipe 10 is fixed to the center of the drilled portion 12 of the manhole 11 with mortar (standard construction example), an earthquake or uneven settlement near the manhole causes Then, even if the mortar 13 is destroyed and the sewer pipe 10 moves eccentrically, inclines, or in the axial direction, the same effects as the above-described expanded diameter portion 2 and bellows portion 4 allow the manhole 11 of the collar portion 2 to move from the manhole 11. Peeling and peeling from the sewer pipe 10 of the cylindrical portion 1 are prevented. Therefore, the above
It is possible to prevent the leakage of sewage to the outside of the manhole 11 and the intrusion of groundwater into the manhole 11, which are most worried when the cause or the like occurs.

[0025]

EFFECTS OF THE INVENTION The rubber manhole joint of the present invention has the above-described structure and operation, and the use of the joint provides the following effects. (1) Even if the sewer pipe must be installed eccentrically with respect to the manhole drilling portion, the sewer pipe can be positioned freely as long as it is inside the drilling portion. (2) Even if it is necessary to correct the position of the sewer pipe with respect to the manhole drilling portion after attaching the joint to the manhole, it can be easily corrected. (3) Even if the mortar part is destroyed due to an earthquake or uneven settlement after the construction, the watertightness of the joint between the manhole and the sewer pipe is reliably maintained.

[Brief description of drawings]

FIG. 1 is a vertical half sectional view showing an embodiment of a rubber manhole joint of the present invention.

FIG. 2 is an enlarged cross-sectional view of the inside of the circle of FIG.

FIG. 3 is a vertical half sectional view showing another embodiment of the rubber manhole joint.

FIG. 4 is a lateral half cross-sectional view of the rubber manhole joint of FIG. 3 viewed from the upper side.

FIG. 5 is a vertical half sectional view showing a standard construction state of a sewer pipe and a manhole.

FIG. 6 is a vertical cross-sectional view showing a state in which a sewer pipe before mortar fixation is eccentrically arranged.

FIG. 7 is a vertical half sectional view showing a conventional rubber manhole joint.

FIG. 8 is a vertical cross-sectional view showing a main part of a conventional eccentric piping state before fixing the mortar.

[Explanation of symbols]

 1 ... Cylindrical part 2 ... Expanded part 3 ... Collar part 3a ... Top part 4 ... Bellows part 5 ... Bonding agent 6 ... Tightening fixture 7 ... Jig guide 8 ... Bonding agent 9 ... Bonding agent guide 10 ... Sewer pipe 11 ... Concrete manhole 12 ... Manhole drilling part 13 ... Mortar 14 ... Cylindrical part 15 ... Collar part 16 ... Annular protrusion 17 ... Tightening fixture 18 ... Bonding agent 19 ... Sewer pipe 20 ... Concrete manhole 21 ... Manhole drilling part

Claims (4)

[Claims] 1. A cylindrical portion (1) into which a sewer pipe is inserted and a disk-shaped collar portion (3) abutting on a side wall of a manhole are integrally formed, and the collar portion (3) is formed. A cement (5) for fixing the manhole is applied to the contact surface of the manhole, and the sewer pipe is fixed to the outer peripheral surface of the cylindrical portion (1) to tighten the water to stop the gap between the sewer pipe and the cylindrical portion (1). In a rubber manhole joint to which a fixing jig (6) is attached, a radially expanded portion (2) is provided at the end of a cylindrical portion (1), and the radially expanded portion (2) and a collar portion are provided. (3) is integrated via a bellows part (4) having an S-shaped cross section, and the expanded diameter part (2) and the bellows part (4) are not manholes of the collar part (3). A rubber manhole joint, which is on the contact surface side and does not project at all on the manhole contact surface side of the collar portion (3). 2. The rubber manhole joint according to claim 1, wherein the bellows portion (4) is continuously provided in two or more peaks. 3. The rubber manhole joint according to claim 1, wherein a bonding agent (8) is applied to the inner peripheral surface of the cylindrical portion (1). 4. The collar portion (3) is formed in a curved shape so as to match the side wall of the circular manhole.
The rubber manhole joint according to item 1 of 3.