JPH11293693A - Joint and packing member used in connection between manhole and conduit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint packing member capable of obtaining flexibility and water-tightness by an easy construction and suitable for a conduit having, in particular, a large diameter when a manhole and the conduit are to be connected together. SOLUTION: This packing member is an annular member connecting both ends of a belt body 6 made of rubber or a synthetic resin. It is possible to realize a double structure consisting of an inner cylinder 4 and an outer cylinder 5 which are concentrical by bending a tip on the inner side of the other fringe. A joint used in the connection between a manhole 1 and a conduit 2 is constituted in such a way that an outer cylindrical part of the packing member is fixed on a mouth part 3 of the manhole 1 by expanding and opening a support ring 9 by a pressing jig, then an inner cylindrical part is folded back on an inner side to realize a concentrical double structure, and the conduit 2 is fixed on this inner cylinder 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for connecting a sewer pipe to a manhole or the like through a mouth of the manhole while maintaining watertightness. Also relates to economical joints that do not lose watertightness. The present invention also relates to a packing member particularly suitable for connecting a large-diameter conduit.

[0002]

2. Description of the Related Art Conventionally, this type of joint requires special tools and adhesives for installation, and is difficult to perform on-site. However, in order to solve this problem,
There is an invention of Japanese Patent Application No. 6-177568 of the same applicant.

[0003] In the invention of Japanese Patent Application No. 6-177568, packing of rubber or synthetic resin in which both inner and outer cylinders concentrically polymerized are joined at one end,
A support ring having a notch inserted between the inner cylinder and the outer cylinder of the packing, and by expanding the support ring, the outer cylinder of the packing is fixed to a mouth such as a manhole. The fixing can be performed reliably and easily by expanding the notch of the support ring and inserting a wedge side into the notch.

[0004]

SUMMARY OF THE INVENTION The aforementioned Japanese Patent Application No. Hei 6-177.
According to the invention of No. 568, a flexible joint can be easily installed on site, but since the packing needs to be molded to the diameter of the conduit, it is difficult to manufacture, especially when the diameter of the conduit is large. There were cases.

The present invention seeks to overcome the problems of the prior art and to provide a packing member particularly suited for connecting large diameter conduits.

[0006]

SUMMARY OF THE INVENTION The present invention relates to an annular member formed by connecting both ends of a band made of rubber or synthetic resin, wherein the end is bent to the inside of the other edge to form a concentric inner part. The above problem is solved by a packing member characterized by having a double structure of a cylinder and an outer cylinder.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numeral 1 denotes a manhole made of concrete. In this embodiment, a plurality of portions are connected to each other, and an opening 3 for connecting a conduit 2 exists.

As shown in FIG. 2, the packing member 8 of the present invention is formed by connecting a band 6 having a constant cross section made of flexible rubber or synthetic resin in an annular shape. Is bent inside the other edge to form a double structure of the concentric inner cylinder 4 and outer cylinder 5. Preferably, by providing circumferential irregularities on the surface of the packing member 8, flexibility can be increased and construction can be more easily performed.

In the joint of the present invention shown in FIG. 3, the inner cylinder 4 formed by the packing member 8 has an inner diameter slightly larger than the outer diameter of the conduit 2 and the outer cylinder 5 has the manhole 1.
Has an outer diameter that is slightly smaller than the inner diameter of the mouth portion 3.

Reference numeral 9 denotes a support ring, which is a belt-shaped ring made of a hard synthetic resin or metal, has a notch 10, and has small holes 1 at both ends 11, 11 close to the notch 10.
2, 12 are provided. In addition, this support ring
It is desirable that the packing member 8 be fitted into a groove provided in advance in a portion inside the outer cylinder 5. In the figure, reference numeral 13 denotes a plurality of ridges provided on a portion outside the outer cylinder 5 for improving the watertightness of the mouth 3 of the manhole 1 and the outer cylinder 5.

As shown in FIG. 5, the crimping jig 14 has a threaded portion 16 of one of the two members 15
5, and a nut 17 is screwed into the screw portion 16. Each member 15, 15 has a leg 18,
The legs 18, 18 are provided so as to be inclined in the left-right direction, and the ends thereof are fitted into the small holes 12 of the support ring 9.

To manufacture the packing member of the present invention,
First, a belt 6 having a constant cross section made of rubber or synthetic resin
Is molded by extrusion. Next, the band body 6 is cut at an appropriate length according to the outer circumference of the conduit to be connected, and both ends thereof are joined to form an annular packing member 8.

To attach the joint of the present invention, first, the packing member 8 is inserted into the manhole 3 together with the support ring 7 with the part to be the inner cylinder 4 first, and the inside of the part to be the outer cylinder 4 Then, the support ring 7 is expanded using the crimping jig 14. The support ring 9 is expanded by inserting the tips of the legs 18, 18 of the two members 15, 15 of the crimping jig 14 into the small holes 12, 12 existing at both ends, and turning the nut of the screw portion 16. This is performed by expanding the portion 16 and inserting a predetermined wedge piece 19 between the notches 8 which are spaced apart.

The leading end 7 of the packing member 8 protruding into the manhole 1 is turned inward to form the inner cylinder 4, thereby forming a concentric double structure. Thereafter, the conduit 2 is inserted into the inner cylinder 4, and the inner cylinder 4 is fixed to the conduit 2 from the outer periphery with a fastening band.

[0015]

As described above, the packing member 8 of the present invention can be obtained by connecting the strips 6 having a constant cross section as described above. And particularly suitable for connecting extremely large diameter conduits.

[Brief description of the drawings]

FIG. 1 is an overall perspective view showing a partially cutaway view.

FIG. 2 is a perspective view of a packing member.

FIG. 3 is a sectional view of a state in which the joint of the present invention is used for a conduit and a manhole.

FIG. 4 is a front view of the support ring with a part cut away.

FIG. 5 is a front view of a crimping jig.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Manhole 2 Conduit 3 Mouth 4 Inner cylinder 5 Outer cylinder 6 Band 7 End of packing member 8 Packing member 9 Support ring 12 Small hole 14 Crimping jig 16 Screw part 17 Nut 18 Leg part 19 Wedge piece

Claims (2)

[Claims] 1. An annular member formed by connecting both ends of a band body 6 made of rubber or synthetic resin, wherein a front end is bent inside the other edge to form a concentric inner cylinder 4 and an outer cylinder 5.
A packing member characterized in that the packing member can have a double structure. 2. The packing member 8 according to claim 1 is inserted into the opening of the manhole with the part to be the inner cylinder 4 first, and the inside of the part to be the outer cylinder 5 is supported by the support ring. A joint used for connecting a manhole and a conduit, wherein the end 7 of the packing member 8 is folded inward to form the inner cylinder 4, and the conduit 2 is fixed to the inner cylinder 4.