JPH06322784A - Joint member between manhole and conduit - Google Patents

Abstract

PURPOSE:To prevent leakage of water owing to flattening of pipe beam when refilling is effected before mortar finishing by a method wherein a wide and thick load support part to support a load generated owing to the own weight of the pipe beam and refilling earth is protruded from at least one spot of a cylindrical part located between the inner peripheral surface of the connection hole of a manhole and the pipe beam. CONSTITUTION:A wide load support part 35 is protruded from the inner peripheral surface of the cylindrical part 31 of a joint member 30 and in a position closer to the inner wall surface of a manhole 10. By bringing the cylindrical part 31 into resilient contact with the outer peripheral surface of a pipe beam 20 and an annular protrusion part 32 and the load support part 35 into resilient contact with the outer peripheral surface of the pipe beam 20, a sponge buffering layer 34 is formed between the cylindrical part 31 and the inner peripheral surface of the connection hole 11 of the manhole 10 to ensure watertightness. This constitution prevents flattening of the pipe beam and sinking of the lower part of the joint member and improves watertightness when refilling is carried out before filling with mortar.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joining member for interposing a manhole buried vertically in the ground and a substantially horizontal pipe to a gap between them.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 1 to 3, a connection hole 11 formed in a side surface of a concrete manhole 10 buried vertically in the ground has a substantially horizontal pipe 20 made of, for example, PVC. In order to prevent water leakage from the gap when the pipes are fitted and connected, the inner peripheral surface of the connection hole 11 of the manhole 10 and the pipe 2
A rubber-made joining member 30 having the following configuration is interposed between 0 and 0. That is, 31 is a cylindrical portion, 32 is a plurality of ring-shaped projections provided on the inner peripheral surface thereof, and 33 is integrally coupled to the outer end of the cylindrical portion 31 and abuts the outer wall surface of the manhole 10. The flange portion 34 is a sponge buffer layer of external closed cells formed on at least a part of the outer peripheral surface of the tubular portion 31, and the tubular portion 31 and the tubular conduit 20 have a ring-shaped projection 32 on the tubular conduit 20. By making elastic contact, a sponge buffer layer 34 is interposed between the tubular portion 31 and the connection hole 11 of the manhole 10, thereby ensuring watertightness.

However, the manhole 10 and the pipe 20
It is general that the inner surface side of the manhole 10 is mortar-finished after the connection with, and when the backfilling is performed before the mortar-finishing, the conventional joining member 30 causes the weight of the pipe 20 and Pipe 2 due to the load caused by buried soil
When 0 is flattened or the joining member 30 is deformed, there is a problem that a gap is created on the upper surface of the pipe 20 and water leaks.

[0004]

The problem to be solved is that when the conventional joining member between the manhole and the pipe is backfilled before the mortar finishing, the conventional joining member 30 becomes This is because the pipe 20 is flattened or the joint member 30 is deformed by a load caused by the weight of the pipe 20 and the buried soil or the like, so that a gap is formed on the upper surface of the pipe 20 and water leaks.

[0005]

Means for Solving the Problems A description will be given with reference to FIGS. A first invention is a connection hole 11 formed in a side wall surface of a concrete manhole 10 buried vertically in the ground.
In order to prevent water leakage from the gap when a substantially horizontal pipe 20 is fitted and connected to the connection hole 1 of the manhole 10.
A plurality of ring-shaped projections 32 that elastically contact the outer peripheral surface of the pipe 20 are provided on the inner peripheral surface of the tubular portion 31 that is interposed between the inner peripheral surface of the pipe 1 and the pipe 20. At the outer end of the portion 31, the flange portion 33 to be brought into contact with the outer wall surface of the manhole 10 and the tubular portion 31 are integrally coupled, and the outer peripheral surface of the tubular portion 31 is provided with the connection hole 11 of the manhole 10. A rubber joining member 3 formed by forming a sponge buffer layer 34 of closed cells elastically contacting the inner peripheral surface
0 and at least at one location on the tubular portion 31
Wide width to support the load caused by zero weight and backfill soil, etc.
A thick load supporting portion 35 is provided so as to project.

In a second aspect of the invention, instead of the load supporting portion 35 of the first aspect of the invention, the weight of the pipe 20 and the backfill thereof are provided at least at one location between the inner periphery of the connection hole 11 and the pipe 20. A wide and thick spacer 36 made of a rigid material for supporting a load caused by soil or the like is interposed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the first invention will be described with reference to FIGS. 4 to 5. Reference numeral 10 is a concrete manhole buried vertically in the ground, and 20 is a connection hole 11 formed in the side surface of the manhole 10. , And made of PVC, for example, a substantially horizontal pipe conduit, and 30 is a rubber joining member that is interposed to prevent water leakage from the gap between the manhole 10 and the pipe conduit 20, Reference numeral 31 is a tubular portion of the joining member 30, 32 is a plurality of ring-shaped projections projecting on the inner peripheral surface of the tubular portion 31 near the outer wall surface of the manhole 10, and 33 is integral with the outer end of the tubular portion 31. And a flange portion which is joined to the side surface of the manhole 10 and is abutted against the side surface of the manhole 10, 34 is a sponge buffer layer of external closed cells formed on at least a part of the outer peripheral surface of the tubular portion 31, and 35 is an inner periphery of the tubular portion 31 Wide projecting toward the inner wall surface of the manhole 10 in the plane A load-bearing part is intended to support the load due to its own weight and backfill soil etc. Kanmizo 20. The cylindrical portion 31 and the outer peripheral surface of the pipe 20 are elastically brought into contact with the outer peripheral surface of the pipe 20 by the ring-shaped projection 32 and the load supporting portion 35, thereby connecting holes between the cylindrical portion 31 and the manhole 10. Water-tightness is ensured by interposing a sponge buffer layer 34 between the inner peripheral surface of 11 and the inner peripheral surface of 11.

In the second aspect of the present invention, instead of the load support portion 35 near the inner wall surface of the manhole 10 on the inner peripheral surface of the tubular portion 31, the inside of the connection hole 11 of the manhole 10 as shown in FIG. A wide and thick spacer 36 made of a rigid material is interposed between the circumferential surface and the pipe 20 to support the weight of the pipe 20 and the load caused by backfill soil.

Incidentally, the JIS (A) hardness of the joining member 30 is preferably about 40 to 60 degrees, and the J of the sponge buffer layer 34 is J.
The IS (A) hardness is preferably 20 degrees or less. The number of ring-shaped protrusions 32 is preferably 2-5. Load support 35 is 1
About 0 to 20 mm, JIS (A) hardness is 50 to 90 °
It is preferably about 70 to 90 ° if possible. The sponge buffer layer 34 has a thickness of 1 to 4 mm, preferably 1 to 2 mm. It is preferable that the material of the spacer has high rigidity, but vinyl chloride, PBT resin, or the like can be used in consideration of workability. Spacer width 10-50 mm, depth 1
About 0 to 30 mm is preferable. Further, it is preferable that a step of about 10 mm is provided between the inner surface of the manhole 10 and the end of the joining member 30, and finally mortar finishing is performed.

The operation will be described. As shown in FIG. 7, the support plate 5 is set to L = 2000 mm apart from K = 100 mm.
As a result of carrying out a water leakage test by supporting it with No. 1, the joining member 30
(Cylindrical hardness: 50 degrees, sponge-like buffer layer thickness: 2 mm, hardness: 12 degrees, load-supporting part width: 12 mm) and pipe conduit 20 (nominal diameter: 200 mm) And H = 2000
With a millimeter head pressure applied, load P = 1800 Kgf
At that time, water leakage occurred, and the subsidence amount of the upper surface of the pipe 20 at that time was 9.0 mm and the deflection rate of the pipe was 3.3%.
As for the same one, as shown in FIG. 8, the load end is fixedly supported 52, and a water leakage test is performed. As a result, the load is 740 Kgf.
Water leakage occurred, and the subsidence amount of the upper surface of the pipe 20 at that time was 7.8 mm, and the deflection rate of the pipe was 2.3%. For comparison, the same test was performed on the conventional example shown in FIG. 3, and as a result, water leakage occurred at a load of 500 Kgf, the subsidence amount of the upper surface of the pipe 20 at that time was 7.6 mm, and the deflection of the pipe was The rate was 1.9%.

[0011]

Since the present invention is constructed as described above,
As described above, in the contact portion between the joining member 30 and the pipe 20, the plurality of watertight ring-shaped projections 32 and the load supporting portion 3 that bears the load caused by the weight of the pipe 20 and the backfill soil or the like.
5 or by providing a spacer 36 together,
The flattening of the pipe 20 and the subsidence of the lower portion of the joining member 30 are prevented, and the watertightness when backfilling is performed before filling the mortar is significantly improved.

[Brief description of drawings]

FIG. 1 is a sectional view of a manhole.

FIG. 2 is a sectional view showing a conventional example.

FIG. 3 is a cross-sectional view showing another conventional example.

FIG. 4 is a sectional view showing a first embodiment of the present invention.

FIG. 5 is a sectional view showing a second embodiment of the present invention.

FIG. 6 is a sectional view showing a third embodiment of the present invention.

FIG. 7 is a cross-sectional view showing the procedure of a water leakage test.

FIG. 8 is a cross-sectional view showing a procedure of a water leakage test by another supporting method.

[Explanation of symbols]

 10 Manhole 11 Connection hole 20 Pipe 21 Cap 30 Joining member 31 Cylindrical part 32 Ring-like projection 33 Flange part 34 Sponge buffer layer 35 Load support part 36 Spacer 50 Displacement meter 51 Load support plate 52 Fixed bearing P load L length It

 ─────────────────────────────────────────────────── ─── Continuation of the front page (71) Applicant 000115337 Yoshicon Co., Ltd. 2622 Riemon, Oigawa-cho, Shita-gun, Shizuoka Prefecture (72) Inventor Kunihiko Hashimoto 2-8, Misono-cho, Nishi-ku, Hiroshima City Nishikawa Gom Industrial Co., Ltd. In-company (72) Shigeru Yamano 2-2-8, Shino-cho, Nishi-ku, Hiroshima-shi Nishikawa Gomu Kogyo Co., Ltd. (72) Innovator Shishin Kobayashi 1-3-2 Kitafu, Takefu-shi, Fukui Hokucon Co., Ltd. (72) Inventor Akira Tanaka 1-3-2 Kitafu, Takefu City, Fukui Prefecture Hokucon Co., Ltd.

Claims (2)

[Claims] 1. A connection hole (11) formed in a side wall of a concrete manhole (10) buried vertically in the ground.
In order to prevent water leakage from the gap when a substantially horizontal pipe (20) is fitted and connected to the pipe, the inner peripheral surface of the connection hole (11) of the manhole (10) and the pipe (20) ), The pipe (20) is provided on the inner peripheral surface of the tubular portion (31).
A plurality of ring-shaped projections (32) that make elastic contact with the outer peripheral surface of the pipe, and a flange portion (33) that abuts the outer wall surface of the manhole (10) at the outer end of the tubular portion (31). Section (31)
Are integrally connected, and the manhole is attached to the outer peripheral surface of the cylindrical portion (31).
Manhole formed by forming a sponge buffer layer (34) of closed cells elastically contacting the inner peripheral surface of the connection hole (11) of the rule (10).
In the rubber joint member (30) between the pipe and the drainage pipe, at least one location of the tubular portion (31) is wide and thick to support the weight of the drainage pipe (20) and the load caused by the backfilled soil. A joint member for connecting a manhole and a pipe with a load support portion (35) provided in a protruding manner. 2. A connection hole (11) formed in a side wall of a concrete manhole (10) buried vertically in the ground.
In order to prevent water leakage from the gap when a substantially horizontal pipe (20) is fitted and connected to the pipe, the inner peripheral surface of the connection hole (11) of the manhole (10) and the pipe (20). A plurality of ring-shaped protrusions (32) that elastically contact the outer peripheral surface of the pipe (20) are provided on the inner peripheral surface of the cylindrical portion (31) interposed between the cylindrical portion (31) and A flange tubular portion (31) to be brought into contact with the outer wall surface of the manhole (10) is integrally coupled to the outer end of the manhole (10), and the manhole (10) is connected to the outer peripheral surface of the tubular portion (31). In the rubber joint member (30) between the manhole and the pipe, which is formed by forming a sponge buffer layer (34) of closed cells elastically contacting the inner peripheral surface of the hole (11), the inside of the connection hole (11) A width made of a rigid material that bears the load caused by the self-weight of the pipe (20) and backfill soil, etc., at least at one location between the peripheral surface and the pipe (20). - the thickness of the spacer (36) is interposed formed by sailing - joining member between Le and Kanmizo.