JP2003129552A - Connecting construction between main sewer pipe and branch pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connecting construction between main sewer pipe and a branch pipe capable of increasing an allowable amount of relative displacement at the connecting portion between the main sewer pipe and a branch pipe and also capable of improving watertightness. SOLUTION: A main sewer pipe 1 having a branch portion 13 equipped with a main pipe portion 11 and a cylindrical portion 12 of the same, a connecting construction of a branch pipe 2 connected watertightly and inserted to the cylindrical portion 12, an inner cylindrical portion 31 with the tip end side portion 34 inserted to the cylindrical portion 12, an outer cylindrical portion 32 fitted to the outer periphery of the cylindrical portion 12 and a rubber joint 3 having a linking step 33 for linking the tip of the branch pipe 2 are used for the connection, and an inner cylindrical portion 31 and an outer cylindrical portion 32 are fastened watertightly by fastening bands 23 and 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection structure for watertightly connecting a main pipe made of resin or the like to a main sewer pipe made of ceramics.

[0002]

2. Description of the Related Art Even today, ceramic sewage mains buried in the past are often used. As shown in FIGS. 8 and 9, this sewage main pipe made of ceramics is connected to a sewage main pipe 1 buried in the ground, and a top end of a manifold 2 whose upper end is connected to a domestic drainage chamber (not shown). The (lower end) portion 21 is connected in a watertight manner. The sewage main 1 includes a main part 11 and the main part 11
It has a branch portion 13 integrally formed in a direction intersecting with and having a large-diameter edge tube portion 12. The distal end portion 21 of the manifold 2 is inserted together with the rubber packing 20 into the rim cylinder portion 12 around which a ridge 22 made of silicon rubber is provided on the inner periphery to be watertightly connected.

[0003]

In the conventional connecting structure of the sewage main pipe 1 and the manifold 2 made of ceramics, the tip portion 21 is tightly fitted to the rim cylinder portion 12 in order to ensure water tightness. , The tolerance of relative displacement of the connection part is small. For this reason, when earth pressure P is applied due to vibration of a heavy vehicle passing over the ground where the main sewer main 1 is buried, an earthquake, etc., the manifold 2 is displaced and a twisting force M is applied to the connection part, and the edge cylinder A crack B is generated in the portion 12 and is easily damaged. As a result, the watertightness is destroyed and infiltration water is generated, so that the sewage main pipe 1 needs to be replaced.

The object of the present invention is to increase the permissible amount of relative displacement of the connection between the main sewer pipe and the branch pipe and to improve the watertightness, so that even if earth pressure is applied to the branch pipe, the edge tube portion is cracked. Another object of the present invention is to provide a connection structure between a sewage main pipe and a manifold that can effectively prevent the occurrence of water leakage and the deterioration of water tightness (seal).

[0005]

According to the present invention, there is provided a main pipe section and a sewer main pipe having a branch portion integrally formed with the main pipe section and having a large-diameter rim cylinder section, and the rim cylinder section. It is a connection structure with a manifold that is plugged in and connected in a watertight manner,
An inner cylinder part having a tip part inserted into the rim cylinder part and into which the tip part of the manifold is inserted, and an outer cylinder part integrally molded with the inner cylinder part and fitted to the outer circumference of the rim cylinder part. When,
The manifold is connected to the branch by a rubber joint formed on the inner circumference of the inner cylinder and having a locking step for locking the tip of the manifold, and the inner cylinder and the fastener are connected by a fastener. The outer cylinder portion is watertightly fastened to the branch portion.

[0006]

In the present invention, the permissible amount of relative displacement of the manifold with respect to the main sewer can be increased, and
It is possible to prevent the edge tube portion of the branch portion from cracking.
Further, even if the edge tube portion is cracked, since the edge tube portion is surrounded by the outer tube portion of the rubber joint, the watertightness (sealing property) can be maintained.

According to the second aspect of the present invention, a gap is formed between the inner circumference of the rim cylinder and the tip of the inner cylinder. Due to this clearance, the allowable amount of relative displacement of the manifold with respect to the rim cylinder is increased, and the damage prevention effect of the rim cylinder is increased.

According to the third aspect of the invention, the locking step is formed outside the edge tube portion. With this configuration, the permissible amount of relative displacement of the manifold with respect to the rim cylinder portion increases, and the effect of preventing damage to the rim cylinder portion increases.

The invention according to claim 4 is characterized in that the distal end portion of the inner cylindrical portion is formed separately. With this configuration, the structure of the joint is simplified and the molding is facilitated, and the permissible amount of relative displacement of the manifold with respect to the edge tube portion is increased, and the effect of preventing damage to the edge tube portion is increased.

According to the fifth aspect of the present invention, the ring is externally fitted to the lower branch portion of the edge tubular portion, and the outer tubular portion is externally fitted to the outer periphery of the ring and fastened with the fastening band. As a result, even if the rim cylinder is damaged, the sealing performance can be secured, and when performing repair work to connect a branch pipe to the branch of the sewage main where the rim cylinder is damaged, the sewer main is dug out and replaced. No need.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of the present invention will be described with reference to FIG. Sewage main 1 is made of ceramics, main part 1
1, and a branch portion 13 integrally formed in a direction intersecting with the main pipe portion 11 and having a large-diameter rim cylinder portion 12. The tip end 21 of the manifold 2 is coaxially inserted into the edge tube portion 12, and the manifold 2 is connected by a rubber joint 3.

The joint 3 includes an inner cylinder portion 31 and an outer cylinder portion 32 which is coaxially extended integrally from the middle portion of the inner cylinder portion 31 toward the distal end side and is fitted to the outer periphery of the rim cylinder portion 12. Have. A locking step 33 for locking the tip 2A of the fitted manifold 2 is formed on the inner circumference of the inner tubular portion 31. A front end side portion (lower side portion in the drawing) 34 of the inner cylinder portion 31 is inserted into the rim cylinder portion 12, and the outer cylinder portion 32 is covered on the outside of the rim cylinder portion 12.
The rear end portion 35 and the outer tubular portion 32 of the inner tubular portion 31 are fastened to the outer circumference of the distal end portion 21 of the manifold 2 and the outer circumferential surface of the edge tubular portion 12 by a fastening band 23 and a fastening band 24 made of stainless steel, and are watertight. Is secured.

FIG. 2 shows a construction process for connecting the main pipe 2 to the main sewer pipe 1. As shown in (a) of FIG. 2, the joint 3 is put on the edge tube portion 12 of the branch portion 13 of the existing sewer main 1 installed in the ground. Next, as shown in (b) of FIG.
The outer tube portion 32 is watertightly fastened to the outer periphery of the edge tube portion 12 by the fastening band 24. In the case of a new sewer main, this process may be performed at the factory. Further, as shown in FIG. 2C, the distal end portion 21 of the manifold 2 is inserted into the inner tubular portion 31, and the upper end portion of the inner tubular portion 31 is watertightly fastened to the outer periphery of the manifold 2 with a fastening band 23. To do.

FIG. 3 shows a second embodiment. In this embodiment, an annular gap 36 is formed between the outer circumference of the inner cylinder part 31 and the inner circumference of the edge cylinder part 12. With this configuration, the manifold 2
The relative displacement tolerance of is increased. It should be noted that the gap 36 is formed on the outer periphery of the inner cylinder portion 31 to form the ridge cylinder portion 1.
It may be formed intermittently between the inner circumference of the two. In this case, the permissible amount of relative displacement of the manifold 2 is increased and the mountability of the manifold 2 is improved.

FIG. 4 shows a third embodiment. In this embodiment, the locking step 33 is set outward (upward in the drawing) from the edge tube portion 12. With this configuration, the permissible amount of relative displacement of the manifold 2 with respect to the rim cylinder portion 12 increases, and the effect of preventing damage to the rim cylinder portion 12 increases.

FIG. 5 shows a fourth embodiment. In this embodiment, the distal end side portion 34 of the inner tubular portion 31 of the joint 3 is formed separately, and the locking step 33 is set outside the edge tubular portion 12 (upward in the drawing). With this configuration, the joint 3
The structure is simple and molding becomes easy. In addition, the rim cylinder part 1
The permissible amount of relative displacement of the manifold 2 with respect to 2 is further increased, and the effect of preventing damage to the rim cylinder portion 12 is increased.

FIG. 6 shows a fifth embodiment. In this embodiment, the rubber ring 4 is provided on the lower branch portion 13 of the rim tube portion 12.
The outer cylinder part 32 while extending the outer cylinder part 32
The second extension 37 is fastened together with the ring 4 to the branch 13 by the fastening band 24. The ring 4 has a notch 41 so that it can be opened and attached to the branch portion 13. With this configuration, watertightness can be ensured even when the edge tube portion 12 is largely damaged. When an adhesive layer 42 having a high sealing property such as butyl rubber is attached to the inner circumference of the ring 4,
Watertightness can be further improved.

FIG. 7 shows a repair work for connecting the manifold 2 while maintaining the watertightness without replacing the sewage main pipe 1 in which the rim cylinder portion 12 is largely damaged. Since it is possible to repair the defective portion 14 of the rim cylinder 12 so as to maintain the watertightness, it is convenient for intermediate repair.

[Brief description of drawings]

FIG. 1 is a perspective view showing a connection structure between a sewer main pipe and a manifold according to the present invention.

FIG. 2 is a construction process diagram of the connection structure of FIG.

FIG. 3 is a sectional view of a second embodiment of the present invention.

FIG. 4 is a sectional view of a third embodiment of the present invention.

FIG. 5 is a sectional view of a fourth embodiment of the present invention.

FIG. 6 is a sectional view of a fifth embodiment of the present invention and a plan view of a ring.

FIG. 7 is a sectional view of a repaired state of the fifth embodiment of the present invention.

FIG. 8 is a cross-sectional view showing a conventional connection structure between a main sewer pipe and a manifold.

FIG. 9 is an assembly diagram showing a conventional connection structure between a main sewer pipe and a branch pipe.

[Explanation of symbols]

1 Sewage main 11 main section 12 rim cylinder 13 branches 2 manifolds 21 Tip 23 Fastening band (fastener) 24 Fastening band (fastener) 3 joints 31 Inner tube 32 Outer cylinder 33 Lock stage 34 Tip Side (Tip) 36 gap 4 rings

Claims (5)

[Claims] 1. A sewage main pipe having a main pipe part and a branch part integrally molded with the main pipe part and having a large-diameter rim cylinder part, and a watertight connection by being inserted into the rim cylinder part. A connection structure with a manifold, wherein an inner cylinder portion is inserted into the rim cylinder portion and a distal end portion of the manifold is inserted, and the inner cylinder portion is integrally molded with the inner cylinder portion. An outer cylinder part fitted to the outer periphery of the rim cylinder part,
The manifold is connected to the branch by a rubber joint formed on the inner circumference of the inner cylinder and having a locking step for locking the tip of the manifold, and the inner cylinder and the fastener are connected by a fastener. A connection structure between a main sewer pipe and a main pipe, wherein an outer cylinder portion is watertightly fastened to the branch portion. 2. The connection structure for a sewer main pipe and a manifold according to claim 1, wherein a gap is formed between the inner circumference of the rim cylinder portion and the tip end portion of the inner cylinder portion. 3. The connection structure between a sewer main pipe and a manifold according to claim 1, wherein the locking step is formed outside of the edge tube portion. 4. The connection structure for a sewer main pipe and a manifold according to claim 1, wherein the tip portion of the inner cylinder portion is formed separately. 5. The rubber ring according to claim 1, wherein a rubber ring is externally fitted to the branch portion on the lower side of the edge tubular portion, and the outer tubular portion is fastened to the outer periphery of the ring with a fastening band. Connection structure between the main sewer pipe and the main pipe.