JPH1129950A - Manhole joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manhole joint whereby a drain pipe can easily and surely be connected to the side wall of a manhole, etc. SOLUTION: A flange 34 is provided on the outer periphery of the boundary between an inner cylinder part 31 in which a sleeve short pipe 4 is fitted and an outer cylinder part 32, with a curved part 33 of a semicircular cross section between the outer periphery and the flange 34, and the sleeve short pipe 4 is tightened by a band 5a wound around the outer periphery of the outer cylinder part 32. A small-diameter cylinder connection 35 is extended from the other end of the outer cylinder part 32, a drain pipe 2 inserted in the sleeve short pipe 4 is tightened by a band 5b wound on the cylinder connection 35, the inner cylinder part 31 is fitted into a connection hole 11 bored in the side wall 1 of a manhole, etc., and the back of the flange 34 is joined to the outer surface of the side wall 1 via an adhesive such as butyl rubber.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manhole joint capable of easily and reliably connecting a drain pipe to a side wall of a manhole or the like.

[0002]

2. Description of the Related Art The present applicant has previously filed Japanese Patent Application No. 6-1372.
Proposed a manhole joint made of an elastic member such as rubber used for connecting a drain pipe to the side wall of a manhole or the like.

In this manhole joint, a flange is provided through a bent portion having a semicircular cross section at one end on the outer peripheral side of one end of a cylindrical portion in which a short sleeve tube is inserted, and the back surface of the flange is provided with an adhesive such as butyl rubber. And a small-diameter cylindrical connecting portion is extended to the other end of the cylindrical portion, and a drain pipe inserted into the sleeve short tube is tightened with a band wound around the cylindrical connecting portion. I was

[0004]

However, in the case of this manhole joint, a thrust load in the pipe axis direction acts on the drain pipe after the pipe is constructed, or a bending moment acts due to earth pressure, wheel load, ground subsidence, or the like. At this time, there is a risk that the flange of the manhole joint will peel off from the side wall of the manhole or the like due to the load directly acting on the drainage pipe, thereby leaking sewage or the like.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a drain pipe can be easily and reliably connected to a side wall of a manhole or the like, and a leakage of sewage or the like can be achieved by absorbing and relaxing a thrust load or the like acting on the drain pipe. To provide a manhole joint that can prevent an accident from occurring.

[0006]

According to the present invention, a flange is provided on the outer periphery of a boundary between an inner cylindrical portion and an outer cylindrical portion in which a short sleeve tube is inserted, through a bent portion having a semicircular arc section. Tighten the sleeve short tube with the band wound around the outer cylinder,
A manhole joint made of an elastic member such as rubber for extending a small-diameter cylindrical connecting portion at the other end of the outer cylindrical portion and tightening a drain pipe inserted into the sleeve short tube with a band wound around the cylindrical connecting portion. The inner cylinder portion is fitted into a connection hole formed in a side wall such as a manhole, and the back surface of the flange is joined to the outer surface of the side wall via an adhesive such as butyl rubber.

In the manhole joint of the present invention, the thickness of the outer peripheral side where the bent portion formed into a semicircular cross section is connected to the flange is made about 2 to 5 times thicker than the inner peripheral side. And a saw-toothed projection is provided on the inner peripheral surface of the cylindrical connection portion around which the band is wound.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of a manhole joint according to the present invention. In the figure, reference numeral 1 denotes a side wall of a manhole or the like, and 2 denotes a drainage pipe such as a PVC pipe. Reference numeral 3 denotes a manhole joint, and reference numeral 4 denotes a sleeve short tube made of a synthetic resin such as polyvinyl chloride. The inner diameter of the sleeve short tube 4 is slightly larger than the outer diameter of the drainage pipe 2.

The manhole joint 3 is made of an elastic member such as rubber or soft plastic, and has a semicircular cross-section around the outer periphery of the boundary between the inner cylindrical portion 31 and the outer cylindrical portion 32 in which the short sleeve tube 4 is inserted. Through the bent portion 33 of the flange 34
Is provided. The inner cylinder portion 31 is thicker than the outer cylinder portion 32 and becomes thinner toward the distal end.

The bent portion 33 is provided for facilitating the movement of the inner and outer cylindrical portions 31 and 32 in the axial direction and the inclination of the inner and outer cylindrical portions 31 and 32 to an arbitrary angle. The outer peripheral side is about 2 to 5 times thicker than the inner peripheral side. The thickness of the bent portion 33 can be appropriately set according to the size of the drainage pipe 2 connected to the manhole joint 3, and the thickness of the inner peripheral side of the bent portion 33 having a semicircular cross section is 3 mm. When the thickness of the outer peripheral side is 6 to 1
It can be 5 mm.

An adhesive such as butyl rubber is uniformly applied to the back surface of the flange 34, and the surface is covered with release paper. This release paper is cut at one or a plurality of locations in the radial direction, so that the release paper can be easily peeled off at the time of piping construction so that the back surface of the flange 34 can be adhesively bonded to the outer surface of the side wall 1.

On the other hand, a small-diameter cylindrical connecting portion 35 is extended from the other end of the outer cylindrical portion 32. The band 5a wound around the cylindrical connecting portion 35 is tightened to thereby form the sleeve short tube 4 Can be fixed. Further, a serrated protrusion 351 is provided on the inner peripheral surface of the cylindrical connecting portion 35 around which the band 5b is wound. When the band 5b is tightened, the serrated protrusion 351 is elastically deformed. To press against the outer peripheral surface of the drain pipe 2 to ensure watertightness.

Next, a procedure for connecting the drain pipe 2 to the side wall 1 of a manhole or the like using the manhole joint 3 will be described. First, a connection hole 11 having an inner diameter substantially equal to the outer diameter of the inner cylindrical portion 31 of the manhole joint 3 is formed at an appropriate position on the side wall 1 such as a manhole, and the inner cylindrical portion 31 is inserted into the connection hole 11. Then, the release paper adhered to the back surface of the flange 34 is peeled off, and the flange 34 is pressed against the outer surface of the side wall 1 and bonded with an adhesive such as butyl rubber.

After the manhole joint 3 is connected to the side wall 1 of the manhole or the like in this manner, the drain pipe 2 is connected to the short sleeve pipe 4.
And the drainage pipe 2 is fixed by tightening the band 5b. At the time of this connection, the eccentricity of the drain pipe 2 with respect to the connection hole 11, the gradient of the pipe, and the like can be adjusted by the bent portion 33 of the manhole joint 3 made of an elastic member.

After the pipe is installed, when a thrust load in the pipe axis direction acts on the drain pipe 2 or a bending moment acts on the drain pipe 2 due to earth pressure, wheel load, ground subsidence, or the like, the outer cylindrical portion 32 tends to buckle. However, since the outer tubular portion 32 is reinforced by the sleeve short tube 4 having rigidity, the outer tubular portion 3
There is no possibility that 2 will be deformed in vain and damaged.

When the above-mentioned load acts on the drain pipe 2, the rear surface of the flange 34 tends to be peeled off from the outer surface of the side wall 1, but the inner peripheral edge of the flange 34 is thick and has a waist. Therefore, a part of the flange 34 peels off from the side wall 1 or the flange 34 starts from the peeled part as a starting point.
Does not peel off from the side wall 1 entirely. Moreover,
Since the thick inner cylinder portion 31 is inserted into the connection hole 11,
The connection with the drain pipe 2 is strengthened, and leakage accidents such as sewage are prevented.

[0017]

As described in detail above, when the manhole joint of the present invention is used, the drainage pipe can be connected to the side wall of the manhole or the like so that the angle can be adjusted, so that the construction work can be performed extremely simply and reliably. In addition, even if an external force such as a thrust load acts on the drain pipe after the pipe is installed, the flange does not peel off from the side wall, and sewage or the like does not leak at the connection portion.

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of a manhole joint of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Side wall of manhole etc. 11 Connection hole 2 Drain pipe 3 Manhole joint 31 Inner tube part 32 Outer tube part 33 Bend part 34 Flange 35 Inner tube connection part 4 Sleeve short pipe

Claims (3)

[Claims] A flange (33) is provided on the outer periphery of a boundary between an inner cylindrical portion (31) and an outer cylindrical portion (32) in which a short sleeve tube (4) is inserted through a bent portion (33) having a semicircular cross section. 34), the sleeve short tube (4) is tightened with a band (5a) wound around the outer periphery of the outer tube (32), and a small-diameter cylindrical connection portion is connected to the other end of the outer tube (32). A manhole joint made of an elastic member such as rubber for tightening a drain pipe (2) inserted into a sleeve short pipe (4) with a band (5b) extended from (35) and wound around the cylindrical connecting portion (35). The inner cylinder portion (31) is inserted into a connection hole (11) formed in a side wall (1) such as a manhole, and the back surface of the flange (34) is bonded to the side wall via an adhesive such as butyl rubber. A manhole joint characterized by being joined to the outer surface of (1). 2. A bent portion (33) formed in a semicircular cross section.
The manhole joint according to claim 1, wherein the thickness of the outer peripheral side connected to the flange (34) is about 2 to 5 times greater than the thickness of the inner peripheral side thereof. 3. The manhole joint according to claim 1, wherein a serrated protrusion (351) is provided on an inner peripheral surface of the cylindrical connecting portion (35) around which the band (5b) is wound.