JP2004324115A - Pipe coupling for manhole - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe coupling for manholes having less damaged parts of the connection part of the manhole side wall and the pipe line. <P>SOLUTION: The manhole pipe joint connects a polyolefin pipe to the manhole side wall. A part with sand applied with adhesive is formed at the outside face of one end part of a polyolefin single pipe. A joint flexibly connecting the olefin pipe is formed at the other end part. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a manhole pipe joint for connecting a polyolefin pipe to a side wall of a manhole.
[0002]
[Prior art]
Synthetic resin pipes such as hard vinyl chloride resin pipes with excellent corrosion resistance and scavenging properties are used as sewer pipes. In recent years, polyolefin pipes such as polyethylene pipes with excellent earthquake resistance have recently been used mainly as pressure feed type sewer pipes. And used in vacuum sewer lines.
And, in the sewer pipe, a manhole is installed for merging, inspection, cleaning, etc. of the pipe, and it is necessary to connect the synthetic resin pipe to the side wall of the manhole.
As a method for connecting the synthetic resin pipe to the side wall of the manhole, a hole is provided in the side wall of the manhole, and a pipe joint for a manhole or an end of the synthetic resin pipe capable of connecting the synthetic resin pipe is inserted into the hole, and the hole is formed with a mortar or the like. In general, a method of filling and fixing the gap between them is common. A sanded portion to which sand is bonded is formed on the outer peripheral surface of the joint between the mortar and the hole in the side wall of the manhole of the manhole pipe joint or the synthetic resin tube so that the joint between the mortars becomes strong.
[0003]
However, the mortar between the synthetic resin pipe and the manhole side wall is rigidly fixed.Therefore, due to expansion and contraction of the synthetic resin pipe, uneven settlement of the soft ground, crustal deformation due to earthquake, etc. Large external force acts on the fixing part, and the synthetic resin pipe may be bent and damaged, or the side wall of the manhole may be broken and the synthetic resin pipe may be detached. There is a problem that there is a risk of intrusion.
[0004]
Therefore, as a manhole joint which can satisfactorily cope with the displacement between the pipe body and the manhole body due to such land subsidence or the like, a manhole joint for connecting the pipe body 10 to the side wall of the manhole, A hole 2 is formed in the main body 1 for fitting the pipe 10, and the joint main body 1 is filled with a movable filler 6 to absorb the radial movement of the pipe 10. A joint for manholes, characterized in that the joint body 1 is configured to be able to expand and contract in the radial direction by the movement of the filler 6 (see, for example, Patent Document 1).
[0005]
[Patent Document 1]
Japanese Utility Model Publication No. 7-35871 (Page 1-3, Figure 1-2)
[0006]
[Problems to be solved by the invention]
The joint for manholes described in Patent Literature 1 has a joint body 1 made of hollow stainless steel, an outer cover 1a having a flange on one end side, and slidably fitted inside the outer cover 1a, and The joint body 1 includes an inner cover 1b in which a hole 2 for fitting the pipe 10 is formed at the center, and a back cover 1c fixed to the back of the flange of the outer cover 1a by welding or the like. Is filled with a filler 6 composed of a number of spherical balls such as grease and hard spheres.
The manhole joint is fitted and inserted into the hole 2 formed in the side wall of the manhole, and the tube 10 is simply fitted into the hole 2 of the joint body 1 to complete the attachment of the tube 10 to the manhole body. The operation can be performed very quickly and easily.
[0007]
When an external force is applied to the pipe body 10 due to land subsidence or the like and the pipe body 10 moves downward, the inner cover body 1b of the joint main body 1 is pressed, and the filler 6 formed of a spherical ball body in the joint main body 1 moves upward. Accordingly, the lower side of the inner cover body 1b enters the outer cover body 1a, and the upper side of the inner cover body 1b descends to hold the tube 10.
That is, since the movement of the pipe body 10 is suitably absorbed by the joint body 1, there is no inconvenience such as causing damage to the pipe body 10 or cracking the manhole body, and the pipe body 10 It can cope with movement well.
[0008]
However, in the above-described manhole joint, the filler 6 in the joint body 1 moves with respect to the vertical movement of the pipe 10, and the connection state is maintained while the pipe 10 is moved up and down. Therefore, there is no problem if the movement of the pipe 10 due to land subsidence or the like is within the allowable movement range in the radial direction of the joint body 1, but if the movement of the pipe 10 exceeds the allowable movement range of the joint body 1, The problem is that a complicated external force acts on the joint between the pipe 10 and the manhole joint, and the pipe 10 or the manhole joint is damaged, or the pipe 10 comes off from the manhole joint and separates. There is.
That is, in the manhole joint of the type described in Patent Literature 1 in which the pipe is held eccentrically with respect to the joint body by the movement of the filler, a long moving distance of the pipe is required due to its structure. Is difficult, and the range of external force that can be handled is limited.
In addition, in the case of crustal deformation due to an earthquake or the like, not only the vertical movement of the pipe but also external forces such as bending, compression, and tension act on the pipe at the joint between the pipe and the manhole. There is a problem that manhole joints often cannot be used.
[0009]
[Means for Solving the Problems]
The present invention solves the problem of the joint for manholes described in Patent Document 1 described above, and is suitable for a manhole in which the joint between the manhole side wall and the pipeline is less damaged even if there is a large crustal deformation due to an earthquake or the like. It is intended to provide a pipe joint.
[0010]
The pipe joint for manhole according to claim 1 is a pipe joint for manhole that connects a polyolefin pipe to a side wall of the manhole, and a sanded portion coated with an adhesive is formed on an outer surface of one end of the polyolefin short pipe. A connection portion for connecting the polyolefin tube flexibly is formed at the end.
As described above, the sanded portion is formed at one end of the polyolefin short tube, and can be firmly joined to the side wall of the manhole, and the other end is a connecting portion that flexibly joins the polyolefin pipe forming the conduit. Is formed, even if there is a large crustal deformation and a large movement occurs in the polyolefin pipe, an external force acting on the joint between the manhole side wall and the manhole pipe joint is bent by bending the flexible connection. Thus, it is possible to prevent the joint between the side wall of the manhole and the pipe joint for the manhole from being damaged.
[0011]
A manhole fitting according to a second aspect of the present invention is the manhole fitting according to the first aspect, wherein a bellows pipe is provided between the sanded portion at one end and the connection portion at the other end to provide a polyolefin pipe. It is characterized in that it is a connecting portion to be joined flexibly.
In this way, if the connecting part for joining the polyolefin pipe flexibly is formed as a bellows pipe, the polyolefin pipe is appropriately bent and responds to movement in any direction and in any size. it can.
[0012]
Further, the pipe joint for a manhole according to claim 3 is the short pipe which abuts on the outer surface of the side wall of the manhole near the connecting portion of the sanded portion of the polyolefin short pipe in the pipe joint for manhole according to claim 1 or 2. And a short tube of the polyolefin short tube and a short tube of the saddle plate are joined by covering with a fiber-reinforced thermosetting resin layer.
In this manner, when the saddle plate with the short cylinder is attached, the manhole pipe joint can be firmly fixed to the hole in the side wall of the manhole by mortar or the like. Further, since the short polyolefin tube and the short tube of the saddle plate are joined by covering with the fiber-reinforced thermosetting resin layer, the fixation of the saddle plate to the short polyolefin tube is also strong.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
The pipe joint for manholes of the present invention will be described with reference to the drawings.
FIG. 1 is a sectional view showing an embodiment of a pipe joint for manholes of the present invention mounted on a side wall of a manhole, and FIG. 2 is a sectional view showing another embodiment.
In the figure, reference numeral 1 denotes a pipe joint for a manhole, in which a sanded portion 12 is formed on the outer surface of one end of a polyethylene short tube 11, and a connecting portion 13 formed of a rubber bellows tube 14 and a pipe insertion port 15 is provided on the other end. Is formed. The connecting portion 13 can flexibly connect the polyethylene tube 2 joined to the tube insertion opening 15 by bending a rubber bellows tube 14.
The sanded portion 12 is formed by applying an adhesive for polyethylene (“Skip 66” manufactured by Sotec Co., Ltd.) to a predetermined position on the outer surface of the polyethylene short tube 11, spraying sand, and curing the adhesive.
[0014]
Reference numeral 16 denotes a saddle plate with a short cylinder, which has a curved surface which abuts on the outer surface of the side wall of the manhole 3 and is attached to the polyethylene short pipe 11 near the connection portion 13 of the sanded portion 12. The saddle plate 16 with a short cylinder is formed by processing a hard vinyl chloride resin tube, and the short cylinder portion is formed by turning the periphery of a hole formed in the hard vinyl chloride resin tube into a flange. A polyethylene short tube 11 is inserted into a plate 16, and a fiber-reinforced thermosetting resin layer 17 formed by winding glass fiber impregnated with a thermosetting resin over the short cylinder outer surface of the saddle plate 16 and the polyethylene short tube 11 outer surface. Are joined.
[0015]
The manhole fitting 1 is attached to a side wall 31 of a concrete manhole 3. A hole 32 is provided at a mounting position of the manhole fitting 1, and the manhole fitting 1 is inserted so that the sanded portion 12 of the manhole fitting 1 is located in the hole 32, and the hole 32 and the sanded portion 12 are inserted. Is filled with mortar 33 and fixed. Then, after the mortar 33 is solidified, the polyethylene pipe 2 is connected to the pipe insertion port 15 of the connection part 13 to form a sewer pipe.
[0016]
Note that the saddle plate 16 and the outer surface of the side wall 31 of the manhole 3 are preferably bonded with an adhesive before being fixed with the mortar 33.
Reference numeral 18 denotes an extended polyethylene pipe extending from the sanded portion 12 of the pipe joint 1 for a manhole. When the pipe joint 1 for a manhole is joined to the side wall 31 of the manhole 3, the inside of the side wall 31 of the manhole 3 is located inside the manhole 3. It is designed to protrude in the direction. After the laying of the sewer pipe has been completed, this extended polyethylene pipe 18 is projected from the inner surface of the side wall 31 of the manhole 3 into the manhole 3 in order to mount a hydraulic test jig when testing the watertightness of the pipe. It may be cut off when the hydraulic test is completed.
[0017]
Further, in the pipe joint for manhole of the present invention, the rubber bellows pipe 14 may be any as long as it bends while maintaining the cylindrical shape. For example, the rubber bellows pipe 14 may be a rubber cylindrical body reinforced with a spiral piano wire. Alternatively, a bellows tube made of a synthetic resin having flexibility may be used.
Further, the saddle plate 16 with the short cylinder may not be provided, and the extended polyethylene pipe 18 is not required unless it is necessary to perform a watertight pressure test.
In addition, the pipe insertion port 15 only needs to be a connection part that can be joined to the polyethylene pipe 2. For example, it may be a flange or a socket.
Then, the rubber bellows tube 14 and the tube insertion opening 15 may be bonded by bonding, tightened by a tightening band, or bonded by flange fastening.
Further, the polyethylene pipe 2 may be a polyolefin pipe having excellent toughness such as a polypropylene pipe.
[0018]
FIG. 2 is a cross-sectional view showing another embodiment, in which the connecting portion 13 described with reference to FIG. 1 is a connecting portion 13a formed of a pipe socket to which the polyethylene pipe 2 can be flexibly joined. 2, the same reference numerals as those in FIG. 1 indicate the same members as those shown in FIG.
In this embodiment, the manhole pipe joint 1a is provided with a sanded portion 12 at one end and a socket 13a at the other end to which the polyethylene pipe 2 can be flexibly joined.
The receiving portion 13a has a long receiving portion, an enlarged back portion, and an annular packing 13b mounted in an annular groove 13c on the end side.
When the polyethylene tube 2 is inserted into the receiving portion 12a, it can be connected in a sealable manner with an annular packing 13b. When the polyethylene tube 2 moves in a complicated manner in the up-down, left-right, and front-rear directions, the end of the polyethylene tube 2 is placed in the packing 13b. While maintaining the sealed state, it can bend and move in the receptacle 12a to cope with the movement of the polyethylene pipe 2.
[0019]
【The invention's effect】
In the pipe joint for a manhole according to the first aspect, a sanded part is formed at one end of the polyolefin short pipe so that it can be firmly joined to the side wall of the manhole, and a polyolefin pipe forming a pipe can be formed at the other end. Since the connection portion to be flexibly joined is formed, even if there is a large crustal deformation and a large movement occurs in the polyolefin pipe, the flexible connection portion is bent to connect the manhole side wall and the manhole pipe joint. The external force acting on the joint can be reduced, and the joint between the manhole side wall and the manhole pipe joint can be prevented from being damaged.
[0020]
Also, in the pipe joint for a manhole according to the second aspect of the present invention, since the connecting portion for joining the polyolefin pipe to be flexible is a bellows pipe in the pipe joint for a manhole according to the first aspect, It can be appropriately bent and responded to any movement in the direction.
[0021]
Further, in the manhole fitting according to the third aspect of the present invention, since the saddle plate with the short cylinder is attached to the manhole fitting according to the first or second aspect, the manhole fitting has a hole on the side wall of the manhole of the manhole fitting. Can be firmly fixed with a mortar or the like. Further, since the short polyolefin tube and the short tube of the saddle plate are joined by covering with the fiber-reinforced thermosetting resin layer, the fixation of the saddle plate to the short polyolefin tube is also strong.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of a pipe joint for manholes of the present invention attached to a manhole side wall.
FIG. 2 is a sectional view showing another embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Manhole pipe joint 11 Polyethylene short pipe 12 Sand part 13 Connection part 14 Rubber bellows pipe 15 Pipe insertion port 16 Saddle plate with short pipe 17 Fiber reinforced thermosetting resin layer 2 Polyethylene pipe 3 Manhole 31 Side wall 33 Mortar

Claims (3)

A manhole pipe joint for connecting a polyolefin pipe to the side wall of the manhole, a sanded part coated with an adhesive is formed on the outer surface of one end of the polyolefin short pipe, and the polyolefin pipe is made flexible at the other end. A pipe joint for manholes, wherein a connecting portion to be joined is formed. 2. A manhole for a manhole according to claim 1, wherein a bellows tube is provided between the sanded portion at one end and the connection portion at the other end to form a connection portion for flexibly joining the polyolefin tube. Pipe fittings. A saddle plate with a short cylinder that abuts on the outer surface of the manhole side wall is attached to the connection part of the sanded part of the polyolefin short pipe, and the polyolefin short pipe and the short cylinder of the saddle plate are covered with a fiber-reinforced thermosetting resin layer. The pipe joint for manholes according to claim 1 or 2, wherein the pipe joint is joined.

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