JP3730368B2 - Manhole fitting - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a manhole joint that can easily and reliably connect a drain pipe to a side wall of a manhole or the like.
[0002]
[Prior art]
As this type of manhole joint, for example, Japanese Utility Model Publication No. 4-29190 proposes a cylindrical joint rubber applied to a joint portion between a concrete manhole and a concrete fume pipe.
[0003]
And when connecting a manhole and a fume pipe | tube using this joint rubber, the flange of a joint rubber is connected to the outer wall of a manhole through an adhesive agent, and a fume pipe | tube is inserted and connected to the cylindrical part of this joint rubber | gum. At the same time, the mortar is filled and connected between the inner wall surface of the connection hole drilled in the side wall of the manhole and the outer peripheral surface of the end portion of the fume tube.
[0004]
[Problems to be solved by the invention]
However, in the case of pipe connection using this joint rubber, since the manhole and the fume pipe are firmly fixed with mortar, a thrust load in the pipe axis direction acts on the fume pipe after pipe construction, and earth pressure and When a bending moment is applied due to a wheel load or ground subsidence, there is a risk that the fume tube may be damaged at the connecting portion due to a load acting directly on the fume tube.
[0005]
The present invention solves such a problem, and can easily and reliably connect a drain pipe to a side wall of a manhole or the like, and absorbs / relaxes a thrust load acting on the drain pipe to prevent damage to the drain pipe. A manhole joint that can be prevented is provided.
[0006]
[Means for Solving the Problems]
The present invention is a manhole joint made of an elastic member such as rubber used when connecting a drain pipe to a connection hole drilled in a side wall of a manhole or the like, and is attached to one end of an outer cylinder portion inserted into the connection hole. An outer flange that is adhesively bonded to the outer surface of the side wall is provided, and an inner cylindrical portion is integrally provided on the inner peripheral side of the outer cylindrical portion via a bent portion that extends from the inner peripheral edge of the outer flange . The peripheral surface is provided with a sawtooth projection, and a short sleeve is inserted into the inner cylinder portion and tightened with a band wound around the outer periphery of the sawtooth projection of the inner cylinder portion. The outer peripheral surface of the outer cylindrical portion expanded by expanding the band set on the inner peripheral side of the cylindrical portion is joined to the inner wall surface of the connection hole via an adhesive such as butyl rubber, and the sleeve short tube is connected via a rubber ring. It is characterized by connecting a drain pipe.
[0007]
The manhole joint of the present invention is characterized in that an inner flange that is adhesively bonded to the inner surface of the side wall is provided at the other end of the outer cylinder portion that is inserted into a connection hole formed in the side wall of a manhole or the like.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional view showing an embodiment of a manhole joint of the present invention, in which 1 is a side wall of a manhole or the like, and 2 is a drain pipe. The drain pipe 2 is a synthetic resin pipe commonly called a rib pipe, and flange-shaped ribs are provided on the outer peripheral surface of the drain pipe 2 at regular intervals in the axial direction. 3 is a manhole joint, and 4 is a sleeve short pipe made of a synthetic resin such as vinyl chloride resin. The sleeve short pipe 4 has an inner diameter slightly larger than the outer diameter of the drain pipe 2.
[0009]
The manhole joint 3 is made of an elastic member such as rubber or soft plastic. The manhole joint 3 is formed on the inner and outer surfaces of the side wall 1 at both ends of the outer cylindrical portion 31 inserted into the connection hole 11 formed in the side wall 1 such as a manhole. A small-diameter inner flange 32 and a large-diameter outer flange 33 to be bonded and joined are provided. An arc-shaped protrusion 311 bulging toward the inner peripheral side is provided in the vicinity of the position where the outer cylindrical portion 31 is connected to the outer flange 33, and the distance between the inner flange 32 and the outer flange 33 is adjusted by the protrusion 311. It can be done. That is, even when the thickness of the side wall 1 such as a manhole is slightly different, the inner and outer flanges 32 and 33 can be firmly bonded to the inner and outer surfaces of the side wall 1 by adjusting the distance between the inner flange 32 and the outer flange 33. It has become.
[0010]
An adhesive such as butyl rubber is uniformly applied to the inner surfaces of the inner flange 32 and the outer flange 33 and the outer peripheral surface of the outer cylinder portion 31, and the surfaces thereof are covered with release paper. One or more portions of the release paper are cut in the radial direction, and the release paper can be easily peeled off from the outer peripheral surfaces of the flanges 32 and 33 and the outer cylinder portion 31 during pipe construction. Yes.
[0011]
Further, a bent portion 34 extending from the inner peripheral edge of the outer flange 33 is provided on the inner peripheral side of the outer cylindrical portion 31, and an inner cylindrical portion 35 is provided integrally and continuously from the bent portion 34. Yes. The bent portion 34 is for facilitating the movement of the inner cylinder portion 35 in the axial direction or tilting to an arbitrary angle, and is limited to the shape shown in FIG. 1 as long as it has this function. It can be made into arbitrary shapes. In a normal state, the outer tube portion 31 and the inner tube portion 35 are concentric, and the sleeve short tube 4 is fitted into the inner tube portion 35. A sawtooth-shaped protrusion is provided on the inner peripheral surface of the inner cylinder portion 35, and the outer peripheral side of the protrusion is fastened with a band 5a.
[0012]
Next, a procedure for connecting the drain pipe 2 to the side wall 1 such as a manhole using the manhole joint 3 will be described. First, a connection hole 11 having a desired inner diameter is drilled at an appropriate position of the side wall 1 such as a manhole, and the manhole joint 3 is inserted into the connection hole 11. At this time, the inner flange 32 of the manhole joint 3 is disposed on the inner side of the side wall 1 and the outer flange 33 is disposed on the outer side of the side wall 1, and the release paper is peeled off from the outer peripheral surfaces of the flanges 32, 33 and the outer cylinder part 31. Then, the flanges 32 and 33 are pressed against the inner and outer surfaces of the side wall 1 to be bonded and bonded, and the band 5b set on the inner peripheral side of the outer cylindrical portion 31 is expanded, thereby expanding the outer peripheral surface of the outer cylindrical portion 31. Is pressure-bonded to the inner wall surface of the connection hole 11 via an adhesive such as butyl rubber.
[0013]
After connecting the manhole joint 3 to the side wall 1 such as a manhole in this way, the end of the drain pipe 2 with the rubber ring 6 attached to the sleeve short pipe 4 is inserted. At the time of this connection, since the eccentricity of the drain pipe 2 and the piping gradient with respect to the connection hole 11 can be adjusted by the manhole joint 3 made of an elastic member, the construction work can be performed easily and reliably. Finally, a filling material such as mortar and butyl rubber is filled in the gap A between the inner peripheral surface of the outer cylindrical portion 31 and the outer peripheral surface of the sleeve short tube 4 to complete the construction work.
[0014]
After the pipe construction, the sleeve short pipe 4 is firmly fixed to the side wall 1 such as a manhole through a filler, but the drain pipe 2 inserted into the sleeve short pipe 4 is in the tube axial direction through the rubber ring 6. Is supported so as to be movable. For this reason, even if a thrust load acts on the drain pipe 2, the drain pipe 2 and the manhole joint 3 are not damaged.
[0015]
1 illustrates an example in which an inner flange 32 and an outer flange 33 are provided at both ends of the outer cylindrical portion 31, but the inner flange 32 may be omitted depending on the situation of the construction site, and there is no inner flange 32. The arc-shaped protrusion 311 can be omitted from the outer cylinder portion 31.
[0016]
【The invention's effect】
As described above in detail, 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 very easily. In addition, since external forces such as a thrust load acting on the drain pipe can be absorbed and relaxed after the pipe construction, the drain pipe and the manhole joint are not damaged at the connecting portion.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of a manhole joint of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Side wall 11 such as a manhole Connection hole 2 Drain pipe 3 Manhole joint 31 Outer cylinder part 32 Inner flange 33 Outer flange 34 Bending part 35 Inner cylinder part 4 Sleeve short pipe

Claims (2)

A manhole joint made of an elastic member such as rubber used when connecting the drain pipe (2) to the connection hole (11) drilled in the side wall (1) of a manhole or the like, and inserted into the connection hole (11) An outer flange (33) that is adhesively bonded to the outer surface of the side wall (1) is provided at one end of the outer cylinder portion (31), and the inner peripheral edge of the outer flange (33) is provided on the inner peripheral side of the outer cylinder portion (31). The inner cylinder part (35) is integrally provided via a bent part (34) extending from the inner cylinder part, and the inner cylinder part (35) is provided with a sawtooth projection on the inner peripheral surface. The sleeve (4) is inserted into the portion (35) and tightened with a band (5a) wound around the outer peripheral side of the saw-tooth-like protrusion of the inner tube portion (35), and the outer tube portion (31) is tightened. The outer peripheral surface of the outer cylinder part (31) expanded by expanding the band (5b) set on the inner peripheral side through an adhesive such as butyl rubber Connected to the inside wall surface of the connection hole (11), manhole joint, characterized in that connecting a drain pipe (2) via a rubber ring (6) in the sleeve short tube (4).   The manhole joint according to claim 1, characterized in that an inner flange (32) bonded to the inner surface of the side wall (1) is provided at the other end of the outer tube portion (31) inserted into the connection hole (11). .

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