JP2000178991A - Manhole and pipe joint for manhole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manhole and a pipe joint for the manhole which can prevent damage of a conduit and improve the efficiency of piping works of a downflow pipe. SOLUTION: A main body 14 and a sewer main pipe 12a are connected to each other by a retractable flexible joint 16, and a retractable flexible joint 76 is used as part of a downflow pipe 18 to be connected to the sewer main pipe 12a. When a force in a direction of expanding/contracting or bending the conduit is applied to the sewer main pipe 12a due to ground displacement accompanying an earthquake or the like, the retractable flexible joint 16 and the retractable flexible joint are deformed, which leads to displacement of the sewer main pipe 12a and the downfall pipe 18 without strain, whereby a stress applied to the joint between the sewer main pipe 12a and a manhole 10 and to the downfall pipe 18 can be absorbed. In this manner, the stress applied to the downfall pipe 18 can be absorbed by the retractable flexible joint, and therefore damage of the conduit in the downflow pipe 18 can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manhole and a pipe joint for a manhole, and more particularly to a manhole in which a downflow pipe is connected to a sewage main pipe in a manhole body, and a manhole constituting a part of the downflow pipe in such a manhole. Related to pipe fittings.

[0002]

2. Description of the Related Art A conventional manhole 1 of this kind shown in FIGS. 9 and 10 has a predetermined step between an upstream sewage main pipe 2a and a downstream sewage main pipe 2b laid on a slope or the like. It is for connecting. The manhole 1 includes a main body 3 having an opening 3a for a person to enter and exit, and an upper side wall of the main body 3 has a telescopic flexible joint 4 having a flexible rubber portion 4a.
The lower sewage main pipe 2a is connected to the lower sewage main pipe 2a via a telescopic flexible joint 5 having a flexible rubber portion 5a, similarly to the upper side wall. You.
A downflow pipe 6 is connected to the sewage main pipe 2a inside the main body 3. The downflow pipe 6 is a manhole joint 6a connected to the end of the sewage main pipe 2a, a straight pipe 6c connected to a branch port of the manhole joint 6a via a collar 6b, and a 90 ° connected to the lower end of the straight pipe 6c. It includes the curved tube 6d and is fixed to the side wall of the main body 3 using the support fitting 7.

After the manhole 1 is constructed, when a force in the direction of expanding or contracting or bending the pipeline is applied to the sewage main pipe 2a due to ground displacement caused by an earthquake or the like, the elastic joint 4 is deformed,
As shown by the two-dot chain line in FIG. 10, the sewage main pipe 2a and the downflow pipe 6 are displaced, and the stress acting on the joint A between the sewage main pipe 2a and the manhole 1 is absorbed.

[0004]

In the prior art, although the joint A can be prevented from being damaged by the elastic joint 4,
Since the downflow pipe 6 fixed by the support fitting 7 does not have elasticity and flexibility, an excessive stress acts on a boundary portion B between the displaceable part and the fixed part of the downflow pipe 6, and the downflow pipe 6 flows down. Tube 6
Could be damaged. There is also a problem that the workability of the piping of the downflow pipe 6 inside the main body 3 is poor.

[0005] Therefore, a main object of the present invention is to provide a manhole and a pipe joint for a manhole which can prevent breakage of a pipe line and improve workability of piping of a downflow pipe.

[0006]

According to a first aspect of the present invention, a main body,
In a manhole including a first telescopic flexible joint for attaching a sewage main pipe to a main body, and a downflow pipe connected to the sewage main pipe in the main body, a second telescopic flexible joint is provided at a part of the downflow pipe. A manhole, characterized by being used.

The second invention is a first short pipe having one end connected to a sewer main pipe and the other end serving as an inspection port, a branch port formed in the first short pipe, A telescopic flexible joint attached to the branch port, and a second short pipe having one end connected to the telescopic flexible joint and the other end serving as a second connection port;
Manhole fitting.

[0008]

When a force in the direction of expanding and contracting or bending a pipeline acts on a sewage main pipe due to ground displacement caused by an earthquake or the like, the first and second telescopic flexible joints are deformed, so that the sewage main pipe and the downflow pipe are deformed. Is easily displaced, and the stress acting on the junction between the sewer main pipe and the manhole and the downflow pipe is absorbed. Further, at the time of piping work of the downcomer pipe, the downcomer pipe can be easily displaced in the second telescopic flexible joint, so that piping can be easily performed even in a limited space in the manhole.

[0009]

According to the present invention, it is possible to prevent the pipeline from being damaged and to improve the workability of piping the downflow pipe. The above and other objects, features and advantages of the present invention are:
It will be more apparent from the following detailed description of embodiments, which proceeds with reference to the accompanying drawings.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A manhole 10 of this embodiment shown in FIGS. 1 and 2 has an upstream sewage main pipe 12 laid on a slope or the like.
a and a downstream main sewage main pipe 12b are connected to each other with a predetermined step.
4, a telescopic flexible joint 16 for connecting the sewage main pipe 12a to the main body 14, and a downflow pipe 18 for guiding sewage to the bottom of the main body 14.

The main body 14 has an opening 2 for a person to enter and exit.
0, and a lid 22 is attached to the opening 20. Further, first holes 24 are formed in the upper side wall and the lower side wall of the main body 14.
And a second hole 26 is formed at the bottom of the main body 14.
An invert 28 for guiding sewage toward the hole 26 is formed. The sewage main pipe 12 a is connected to the first hole 24 via the elastic joint 16, and the sewage is connected to the second hole 26 via the elastic joint 30 having the same structure as the elastic joint 16. The main pipe 12b is connected.

As shown in FIG. 3, the expansion joint 16 includes a saddle portion 32 made of a synthetic resin such as vinyl chloride and a flexible portion 34 made of a flexible material such as rubber. The saddle portion 32 includes a mounting portion 36 curved along the outer surface of the main body 14, and a plurality of holes 38 are formed in the mounting portion 36. A hole 40 is formed substantially at the center of the mounting portion 36,
A rising portion 42 is formed by rising from the periphery of the hole 40. On the other hand, the flexible portion 34 includes a tubular portion 44, and the tubular portion 44
A flange-like seal portion 46 is formed to extend radially outward from one end of the seal portion 46, and a plurality of protrusions 48 are formed on the seal portion 46. When the projection 48 and the hole 38 are fitted, the saddle portion 32 and the flexible portion 34 are joined.

As shown in FIG. 1, the downcomer pipe 18 includes a manhole fitting 50, a straight pipe 52, and a 90 ° bent pipe 54. As shown in FIG. 3, the manhole pipe joint 50 includes a cross-shaped short pipe 56, and a connection port 58 and a first inspection port are provided at one end, the other end, the upper end, and the lower end of the short pipe 56, respectively. 60, a second inspection port 62 and a branch port 64 are formed, and a lid 66 for closing the first inspection port 60 and the second inspection port 62 is attached via a sealing material 66a. It is fixed using. That is, as shown in FIG. 4, a screw hole 70 is formed in
A hole 72 corresponding to the screw hole 70 is formed in the inspection port 60 and the second inspection port 62, and the wing bolt 68 passes through the hole 72 from the outside of the first inspection port 60 and the second inspection port 62 to the screw hole 70. It is screwed.

As shown in FIG. 3, a connecting member 74 is adhered to the branch port 64, and an outer surface of the branch port 64 and the connecting member 74 is formed in a bellows shape made of a flexible material such as rubber. The expansion joint 76 is connected using a fastening band 78a, and a short pipe 80 is connected to the lower end of the expansion joint 76 using a fastening band 78b. The straight pipe 5 is connected to the connection port (lower end) of the short pipe 80 via the collar 82.
2 is connected, and a 90 ° bent pipe 54 is connected to the lower end of the straight pipe 52.

When assembling the manhole 10, the downflow pipe 18 is piped inside the main body 14 installed underground, and the connection port 58 of the manhole fitting 50 is arranged in the hole 24 of the main body 14. The downflow pipe 18 is fixed to the main body 14 below the telescopic flexible joint 76 by using a support fitting 84. On the other hand, the expandable flexible joint 16 is fixed to a position corresponding to the hole 24 on the outer surface of the main body 14 using a number line (not shown). The downstream sewage main pipe 12 b is connected to the hole 26 of the main body 14 via the joint 30, and the upstream sewage main pipe 12 a is connected to the connection port 58 of the manhole fitting 50. The mortar 86 is filled in the gap between the outer surface and the inner surface of the hole 24. However, this construction procedure may be appropriately changed according to the site situation.

After the construction, when a force in the direction of expanding or contracting the pipeline acts on the sewer main pipe 12a due to ground displacement due to an earthquake or the like, the elastic joints 16 and 76 are deformed, and the sewer main pipe 12a is deformed. In addition, the downflow pipe 18 (manhole pipe joint 50) is easily displaced as shown by a two-dot chain line in FIG. 3, and the stress acting on the junction between the sewage main pipe 12a and the manhole 10 and the downflow pipe 18 is absorbed. You.

According to this embodiment, the stress acting on the downcomer pipe 18 can be absorbed by the expansion and contraction flexible joint 76, so that damage to the pipeline in the downcomer pipe 18 can be prevented. In addition, since the length and direction of the downflow pipe 18 can be appropriately adjusted in the expansion and contraction joint 76, the downflow pipe 18 can be easily piped even in a limited space in the main body 14. In the above embodiment,
The manhole fitting 50 has two access ports 60 and 62.
Although the case of forming is shown, for example, as shown in FIG. 5, the inspection port 60 may be formed only on the side end of the pipe joint 50 for manholes.

In the above-described embodiment, the elastic joint 76 of the pipe joint 50 for manhole is formed in a bellows shape with a flexible material such as rubber. It can be changed, and may be formed in a plane shape as shown in FIG. 6, for example. Further, in the above-described embodiment, the expansion / contraction flexible joint 76 is disposed above the downflow pipe 18.
The telescopic flexible joint 76 may be arranged at any position of the downflow pipe 18, for example, as shown in FIG. 7, may be arranged at the center of the downflow pipe 18. In this case, a straight pipe 96 is connected via a collar 94 to a branch port 92 of a short pipe 90 constituting a manhole pipe joint 88, and a lower end of the straight pipe 96 is connected via a connecting member 74 (FIG. 3). The expansion joint 76 is connected.
Then, below the expansion / contraction joint 76, the falling pipe 18
Is fixed to the main body 14.

Further, in the above-described embodiment, the flexible joint 76 is connected to the branch port 64 via the connecting member 74. For example, as shown in FIG.
The expansion / contraction flexible joint 76 may be directly connected to the branch port 64 without using the branch port 4.

[Brief description of the drawings]

FIG. 1 is an illustrative view showing one embodiment of the present invention;

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is an illustrative view showing a connection structure between a sewage main pipe and a downflow pipe;

FIG. 4 is an illustrative view showing a mounting structure of a lid for closing an inspection port;

FIG. 5 is an illustrative view showing a modified example of the pipe joint for manholes;

FIG. 6 is an illustrative view showing a modified example of the manhole pipe joint;

FIG. 7 is an illustrative view showing another embodiment of the present invention;

FIG. 8 is an illustrative view showing another embodiment of the present invention;

FIG. 9 is an illustrative view showing a conventional technique;

FIG. 10 is an illustrative view showing a connection structure between a sewage main pipe and a downflow pipe in a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Manhole 12a, 12b ... Sewage main pipe 14 ... Main body 16, 76 ... Elastic expansion joint 18 ... Downflow pipe 50 ... Manhole pipe joint 56 ... Short pipe 58 ... Connection port 60, 62 ... Inspection port 64 ... Branch port 84 … Support bracket

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Tomoaki Hori 64 Ishizu-Kitacho, Sakai-shi, Osaka Kubota Vinyl Pipe Factory F-term (reference) 2D047 BA28 3H019 AA01 AA04 BA04 BB02 DA03

Claims (2)

[Claims] 1. A manhole comprising a main body, a first telescopic flexible joint for attaching a sewage main pipe to the main body, and a down flow pipe connected to the sewage main pipe in the main body, A manhole, wherein a second telescopic flexible joint is used for a part of the manhole. 2. A first short pipe, one end of which is a first connection port connected to a sewer main pipe, and the other end of which is an inspection port; a branch port formed in the first short pipe; And a second joint connected at one end to the flexible joint and the other end serving as a second connection port.