JP2001159182A - Sewer line earthquake resisting joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sewer line earthquake resisting joint making the joint as an earthquake resistant structure even if it is a sewer. SOLUTION: A sewer line earthquake resisting joint is so constituted that a storing groove 5 for a sealing rubber ring 4 is formed inside of an opening side 2a of a socket 2, the sealing rubber ring 4 is stored in the storing groove 5, a joint 3 having a joint projection 7 on the circumference inserts the joint projection 7 in the socket 2 across the inside of the sealing rubber ring 4 and that a lock ring 6 having an outside diameter capable of coming into contact with the inside of a levee wall of the storing groove 5 is fitted to the inside circumference of a part of the sealing rubber ring 4 between the inside of the opening side 2a of the socket and the outside of the joint 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a seismic joint for sewage pipes.

[0002]

2. Description of the Related Art Conventionally, as a structure of a joint of a seismic pipe for water supply, for example, a rubber ring for sealing is mounted on an opening end portion of a receiving port, and a lock ring is mounted on an inner periphery deeper than the receiving port. , A projection is formed on the outer periphery of the insertion opening, and the projection is configured to engage with the lock ring from the back side of the reception opening. In addition to allowing the insertion of the insertion port, the insertion port can be pulled out until the projection of the insertion port engages with the lock ring of the receiving port. Some have a total allowable length of 2% of the pipe length.

[0003] By the way, the joints of these seismic pipes are provided with a mounting groove for a rubber ring for sealing, a mounting groove for a lock ring, and the like. Furthermore, when the above-mentioned water supply pipe is used as a pipe for sewerage, the sewerage joint is usually inserted until the tip of the insertion hole hits the back end of the receptacle, and a gap is formed between the insertion end and the reception end. Since it is not usually provided, there is a problem that the length is unnecessarily increased by an allowable length of expansion and contraction of the contracted portion.

[0004] In addition, due to the nature of the joint used for the sewage pipe, it is necessary to seal a structure incorporated into the inner surface of the receiving port, such as a lock ring, so that the sewage does not come into contact. However, since a lock ring or the like is disposed behind the rubber ring for sealing, there is a problem that sewage in the pipe directly enters these lock ring portions.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances and has solved the above-mentioned problems by improving the useless structure of the joint portion. The purpose is to be able to lay inexpensively.

[0006]

According to the seismic joint for sewage pipes of the present invention, a storage groove for a sealing rubber ring is formed on the inner surface on the opening side of the receiving port, and the sealing rubber ring is stored in the storage groove. ,
An insertion port having an insertion projection on the outer periphery is inserted into the reception port by inserting the insertion projection beyond the inner surface of the sealing rubber ring, and the inner surface of the sealing rubber ring on the receiving opening side and the outer surface of the insertion port. A lock ring having an outer diameter capable of abutting against the inner surface of the bank wall of the storage groove is fitted into a part of the inner circumference of the sealing rubber ring.

In other words, according to the seismic joint for sewer pipes of the present invention, the lock ring for preventing the escape of the insertion opening is integrated into the opening of the rubber ring portion for sealing.
There is no need to separately provide the lock ring storage groove, the centering rubber, and the like, and the structure is simplified. Further, since the lock ring is installed on the opening side of the sealing rubber ring, it is protected from internal sewage.

Since the insertion end can be abutted against the back end of the receptacle, there is no need to consider a margin for shrinkage, and there is no need to provide a lock ring storage groove on the inner surface of the receptacle. The length of the joint can be shortened.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the seismic joint for sewage pipes of the present invention will be described. FIG. 1 is a partially cut-away side view of a sewer pipe seismic joint according to an embodiment of the present invention;
FIG. 2 is an enlarged sectional view taken along line XX of FIG. In FIG. 1, reference numeral 1 denotes a sewage pipe, which in this embodiment is a metal pipe such as a ductile cast iron pipe.

The sewer pipe 1 has a receiving port 2 at one end,
The other end is an insertion port 3 and can be connected by inserting the insertion port 3 of the other pipe 1 into the receiving port 2 of the one drain pipe 1. A receiving groove 5 for the sealing rubber ring 4 is formed on the inner surface of the receiving port 2 on the side of the receiving port opening end 2a, and the sealing rubber ring 4 is stored in the storing groove 5. In the drawing, T indicates the axial width of the sealing rubber ring 4.

An insertion opening 3 having an insertion projection 7 on the outer periphery.
Is inserted over the sealing rubber ring 4 until the tip 3a is abutted against the receiving end 2b. The rubber ring 4 for sealing has fin-shaped projections 4a, 4a, 4a, 4b, the cross-sectional shapes of which are inclined toward the inside of the pipe so that the insertion opening 3 and the insertion projection 7 can be easily inserted.
b is formed, and an engagement protrusion 5b is formed on the bottom surface of the storage groove 4 so that the rubber ring 4 for sealing is not drawn into the receiving hole when the insertion opening 3 is inserted. A recess 4c fitted with the mating projection 5b is formed at a corresponding position.

The fins 4a, 4b are preferably provided in two stages along the axial direction of the tube as shown. A lock ring 6 having an outer diameter capable of contacting the inner surface of the bank wall 5a forming the storage groove 5 is provided between the inner surface of the sealing rubber ring 4 on the receiving opening side and the outer surface of the insertion opening 3. 4 is arranged along the outer periphery on the front surface 4f on the opening side of the receiving opening,
The front surface 4f functions like a centering rubber for the lock ring 6.

As shown in the figure, the front surface 4f of the sealing rubber ring 4 has a tapered surface so that the lock ring 6 and the sealing rubber ring 4 are both easily expanded and deformed when an insertion projection 7 described later passes therethrough. It has also been. In the above embodiment, the position where the insertion projection 7 is provided is the pipe end 3 a of the insertion 3.
It is set to the inside by a distance t substantially equal to the width T of the rubber ring 4 for sealing.

This is because the outer surface of the insertion port 3 is sealed by the sealing rubber ring 4 when the insertion port projection 7 is engaged with the lock ring 6. The distance S between the projection 7 and the lock ring 6 when the insertion opening 3 is inserted is, for example, 1.5% of the pipe length. Next, assembly and seismic operation of the seismic joint for sewer pipes of the present invention will be described.

First, the sealing rubber ring 4 is stored in the storage groove 5 in the receiving port 2, and then the lock ring 6 is installed on the opening end side of the sealing rubber ring 4. Next, a lubricating material is applied to the outer surface as required, and the insertion port 3 having the insertion projection 7 is inserted into the receiving port 2, and the lock ring 6 and the sealing rubber ring 4 are forcibly passed through the insertion port. The insertion port is inserted until the pipe end 3a of the No. 3 contacts the reception port rear end 2b. At this time, since the lock ring 6 is elastically held by the sealing rubber ring 4, the sealing rubber ring 4 functions as a centering rubber of the lock ring 6.

The pipe joint is now in the state shown in FIGS. 1 and 2, and the pipe connection is completed. Next, in the normal state, since the front end 3a and the rear end 2b of the insertion port 3 and the reception port 2 are in contact with each other, the solid content contained in the sewage flows between the inner surface of the reception port 2 and the outer surface of the insertion port 3. In addition, the sealing function of the sealing rubber ring 4 prevents sewage in the pipe from flowing out of the pipe, and groundwater and rainwater outside the pipe from flowing into the sewage pipe.

Next, as shown in FIG. 3, when a large axial external force is applied to the sewer pipe 1 due to the earthquake, and the insertion port 3 moves in the escape direction as shown by an arrow, the insertion port projection 7 becomes a sealing member. The rubber ring 4 moves through the fin-shaped portions 4b and 4a one after another. At this time, the insertion projection 7 is
The outer fins 4a have a sealing function when passing through the outer fins 4a, and the inner fins 4b have a sealing function when passing through the outer fins 4a. Even in this case, leakage of sewage in the pipe to the outside is prevented. In addition, the insertion protrusion 7 is formed on the inner fin 4.
When it stops between b and the outer fin 4a, the inner fin 4b prevents the outflow of sewage in the pipe, and the outer fin 4a prevents the intrusion of external groundwater or rainwater.

When the moving distance becomes S, the insertion projection 7 comes into contact with the lock ring 6, and the lock ring 6 collides with the inner surface 5a of the peripheral wall to function as a stopper, and the further insertion of the insertion port 3 is prevented. To prevent. Also, with respect to the axial external force in the direction of contracting the joint, the distal end 3a of the insertion port 3 and the receiving port inner end 2b are in contact with each other.

Therefore, even if the ground changes due to a large earthquake, the joint does not come off. Further, even after the insertion port has been moved in this way, the outer surface of the insertion port 3 and the inner surface of the receiving port 2 are sealed by the rubber ring 4 for sealing, so that the lock ring 6 is not immersed in sewage. There is no drainage of sewage or inflow of external groundwater or rainwater.

In the above-described embodiment, the cross-sectional shape of the sealing rubber ring 4 may be any other shape as long as it functions as a centering rubber for the seal and the lock ring 6 in addition to the illustration. .

[0021]

As described above, the seismic joint for sewage pipes of the present invention has a structure in which the lock ring for preventing disengagement is integrally incorporated into the rubber ring portion for sealing. Since the groove and the centering rubber are not required, and the allowable amount S of expansion and contraction only needs to be in the extending direction, the two can be combined to shorten the shape of the joint.

Further, members required for preventing detachment, such as a lock ring, are protected from sewage by rubber for sealing, and have an effect that a long-term durability can be achieved.

[Brief description of the drawings]

FIG. 1 is a partially broken side view of Embodiment 1 of the present invention.

FIG. 2 is an enlarged sectional view taken along line XX of FIG. 1;

FIG. 3 is an operation explanatory view of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drain pipe 2 Reception opening 2a Reception opening opening end 2b Reception opening end 3 Insertion opening 3a Insertion end surface 4 Rubber ring for sealing 5 Rubber ring storage groove for sealing 6 Backup ring 7 Insertion projection

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Takatoshi Ochi 2-26-Ohama-cho, Amagasaki-shi, Hyogo Pref. F-term (reference) in Kubota Mukogawa Works 2D063 BA26 BA27 3H104 JA01 JB02 JC09 JD01 KA04 KB20 LF16 LG02 LG22 MA08

Claims (1)

[Claims] A receiving groove for a sealing rubber ring is formed on the inner surface on the opening side of the receiving port, the sealing rubber ring is stored in the receiving groove, and the insertion port having an insertion projection on the outer periphery is the insertion port. A mouth projection is inserted into the socket over the inner surface of the sealing rubber ring,
A lock ring having an outer diameter capable of abutting against the inner surface of the embankment wall of the storage groove is provided between the inner surface of the rubber opening for sealing and the outer surface of the insertion opening on the inner periphery of a part of the sealing rubber ring. A seismic joint for sewage pipes, wherein the joint is inserted.