JP2001254429A - Earthquake resistant joint for sewage pipeline - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inexpensively provide a pipe joint for a sewage pipe of an earthquake resistant structure by a metallic pipe such as a ductile cast iron pipe. SOLUTION: In a pipe connected by inserting an insertion port 5 formed at an end part of are pipe 6 inside a socket 1 formed in an end part of the other pipe 6 by interposing a sealing rubber ring 2, the depth of a housing groove 7 for the sealing rubber ring 2 formed on an opening side inside surface of the socket 1 is deepened toward the inmost part of the pipe socket 1. This deepened part is formed as a deformation housing part of the sealing rubber band 2 deformed by being compressed when inserting into the insertion port.

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 joint structure of a seismic pipe for water supply such as ductile cast iron pipe, a rubber ring for sealing is attached to an opening end portion of a receiving port, and a lock ring is provided on an inner periphery of the receiving port at the back. At the same time as mounting, a projection is formed on the outer periphery of the insertion port, and this projection is configured to engage with the lock ring from the back side of the receiving port, and the position where the tip of the insertion port hits the back end of the receiving port Up to the entrance into the receptacle,
The outlet can be pulled out until the projection of the insertion engages with the lock ring of the receiving port.
There is known a pipe joint having a total shrinkage of 2% and a total allowable expansion and contraction length of 2% of the pipe length.

[0003] By the way, the sewage joint is usually inserted until the front end of the insertion hole hits the back end of the receptacle, and there is usually no gap between the front end of the insertion port and the back end of the reception port. If the pipe is used as it is as a pipe for sewerage, there is a problem that the receiving port becomes unnecessarily longer by an allowable length of expansion and contraction of the shrinking portion, and the length of the pipe becomes longer by that amount, resulting in an increase in cost.

[0004] Therefore, when the insertion end of the receptacle is inserted to the depth of the receptacle separated by the permissible escape distance so that the receptacle end can be used for sewerage, the receptacle end is inserted into the receptacle end. It has been proposed that the shape of the pipe be adapted to the sewer by reducing the length of the receiving port to a depth substantially in contact with the back of the mouth.

[0005]

However, even in such a pipe joint, as shown in FIG. 4, the storage groove 3 of the sealing rubber ring 2 formed on the inner surface of the socket 1 extends along the axial direction of the pipe. As shown in FIG. 5, the rear end portion 4 serves as a deformable storage portion of the sealing rubber ring 2 when the insertion opening 5 is inserted. There is a problem that the axial length E of the storage groove 3 is increased and the receiving port length is unnecessarily long.

SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned problem and to further shorten the shape of the sealing rubber ring storage groove in the streamlined receiving port of the pipe to rationalize the receiving port shape. .

[0007]

In order to solve the above-mentioned problems, a seismic joint for sewage pipes according to the present invention is formed inside a receiving port formed at an end of one pipe and at an end of the other pipe. A pipe in which the inserted insertion hole is inserted through a rubber ring for sealing to be inserted and connected, and the depth of the storage groove of the rubber ring for sealing formed on the inner surface on the opening side of the receiving port is equal to the diameter of the pipe receiver. The deeper the part is, the deeper the part is. The deeper part is a deformation storage part of the rubber ring for sealing, which is compressed and deformed when the insertion is inserted.

Therefore, according to the seismic joint for sewer pipes, the compression deformation of the sealing rubber ring when the insertion opening is inserted is deformed not only in the axial direction but also in the radial direction. The axial length of the storage groove of the wheel can be reduced, and the length of the receiving port can be shortened accordingly.

[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 a cross-sectional view of a main part showing a joined state.

In FIG. 1, a sewage pipe 6 made of a metal pipe such as a ductile cast iron pipe has a receiving port 1 formed at one end and an insertion port 5 at the other end. Can be connected by inserting the insertion port 5 of the tube 6.

A receiving groove 7 for the sealing rubber ring 2 is formed on the inner surface of the receiving opening 1 on the inner surface of the receiving opening 1 of the sewer pipe 6. The storage groove 7 of the sealing rubber ring 2 is made deeper as the depth d from the inner surface 8 of the receiving port 1 goes deeper into the pipe receiving port 1, and the deepened portion 9 compresses the sealing rubber ring 2. It serves as a deformation storage part when it is deformed.

In FIG. 1, reference numeral 10 denotes a lock ring, which is housed in a housing groove 12 through a centering member 11 made of an elastic sponge-like urethane foam resin or the like.

The circumferential ridge 13 formed at the end of the insertion port 5 is formed by welding beads or the like, and engages with the lock ring 10 from the back side of the receiving port 1 to thereby form the insertion port 5.
To prevent escape.

Next, the operation of this embodiment will be described. First, a centering member 11 made of a foamed synthetic resin or the like, for example, a ring made of foamed polyurethane is housed in the lock ring housing groove 12, and the diameter of the lock ring 10 is reduced by a jig (not shown). To be stored. Next, the sealing rubber ring 2 is inserted into the rubber ring storage groove 7.

After that, the insertion opening 6 is inserted into the receiving opening, and after the circumferential projection 13 pushes and spreads the lock ring 10, it is further inserted until the insertion end 14 contacts the receiving end 15. 2
Connect to the state shown in. In this state, the inside of the sewer pipe 6 is sealed with the sealing rubber ring 2 from the outside.

The sealing rubber ring 2 is compressed and deformed in the storage groove 7, but since the depth of the storage groove 7 is deeper as it goes deeper into the pipe receiving port, it becomes deeper as shown in FIG. Is compressed and filled.

Accordingly, since the deformable storage portion of the sealing rubber ring 2 of the storage groove 7 is formed not only in the axial direction but also in the radial direction, the axial length of the storage groove 7 for the same compressive deformation is formed. The length E can be reduced, and the length P of the receiving port can be reduced accordingly.

In the above-mentioned pipe joint, since the lock ring 10 is tightly tightened and comes into contact with the outer surface of the insertion port 5 after the insertion of the insertion port, a large axial external force is applied to the sewer pipe 6 due to an earthquake or the like, as shown in FIG. When the insertion port 5 moves in the direction of the arrow, the circumferential projection 13 engages to prevent the insertion port 5 from coming off.

Therefore, even if the ground changes due to a large earthquake, the joint does not come off. In addition, even after the insertion port 5 moves in this way, the gap between the outer surface of the insertion port 5 and the inner surface of the receiving port 1 is sealed by the sealing rubber ring 2, so that sewage leaks out, and external groundwater and rainwater are discharged. It does not flow into the sewer pipe 6.

[0020]

As described above, the seismic joint for sewage pipes of the present invention has a structure that allows only extension compared with the expansion joint used for water supply, and also has a structure for sealing in the storage groove of the rubber ring for sealing. The rubber ring deformed storage section is provided in the depth direction of the storage groove, and the axial length of the storage groove is shorter than the conventional one, so the length of the sewer can be shortened accordingly, like a ductile cast iron pipe This has the effect that even a simple pipe can be provided at low cost as a sewer pipe.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view of an embodiment.

FIG. 2 is an enlarged sectional view of a main part of the embodiment.

FIG. 3 is an enlarged sectional view of a main part, showing an operation of the embodiment.

FIG. 4 is an enlarged sectional view of a main part of a conventional receptacle.

FIG. 5 is an enlarged cross-sectional view of a main part showing a state in which an insertion hole is inserted into a receptacle of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Receiving port 2 Sealing rubber ring 5 Insertion port 6 Drain pipe 7 Sealing rubber ring storing groove 8 Inner opening 9 Deepened portion of sealing rubber ring storing groove 10 Lock ring 11 Centering member 12 Lock ring storage Groove 13 Circumferential projection 14 Insert end face 15 Reception port end

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Kazuto Ninomiya 2-26, Ohama-cho, Amagasaki-shi, Hyogo F-term in Kubota Mukogawa Works (reference) 2D063 BA02 BA26 BA27 3H015 FA06 3H104 JA08 JB02 JC09 JD01 KA04 KB03 KB07 KB11 LF02 LG03 LG22

Claims (1)

[Claims] 1. A tube in which an insertion hole formed at an end of the other tube is inserted into a receiving hole formed at an end of one tube via a rubber ring for sealing, and is connected. The depth of the storage groove of the sealing rubber ring formed on the inner surface of the receiving port opening side is made deeper toward the inner side of the pipe receiving port, and the deepened portion is compressed at the time of inserting the insertion port. A seismic joint for a sewer pipe, which is a deformable storage portion of the deformable sealing rubber ring.