JP2002302963A - Plastic small manhole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To install a branch pipe in a plastic small manhole by a post treatment connecting method. SOLUTION: Since an inspection cylinder 3 having an inner cover 4 is connected to a rising part 3 of the plastic small manhole 1 via a rubber ring socket 12, when trying to install the branch pipe 14 by the post treatment connecting method, the rubber ring socket 12 becomes a hindrance. Therefor, the rising part 18 is lengthened, and a main groove 19 of an invert is deviated to secure a joining position of a flange 15 of the branch pipe 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small-sized plastic plastic
More specifically, the present invention relates to a small-sized manhole with a sewer or a mounting pipe for branch lines.

[0002]

[Prior Art] According to the Japan Sewerage Association Standards, recently,
Public roads where buried objects other than sewage facilities were buried complicatedly,
Sewage mains have also been installed on public roads provided in narrow places, so that small-sized manholes made of hard vinyl chloride (hereinafter simply referred to as small-sized manholes) are often used. It is said that this has been standardized.

[0003] Such a standardized small manhole 1A is:
It is as shown in FIG. That is, the small manhole 1
A is generally composed of an inverting portion (manhole body) 20, a rising portion (inspection tube) 3, an inner lid 4 and a protective lid 5, and the inverting portion 20 is provided with a PVC pipe. In addition, downstream sewage main pipes 6 and 7 are connected, and an attachment pipe 8 connected to a residential land drain pipe is connected.

In general, however, the mounting pipe is connected to the sewage main pipe by using a branch pipe joined to the upper outer surface from the center thereof, but the point where the mounting pipe is connected comes close to the small manhole 1A. If it joins with the small manhole 1A as described above, the construction effect is improved.

The inner lid 4 is closed at the upper end of the rising portion 3 so as to be openable and closable, and the protective lid 5 comprises an iron frame 10 mounted on a pedestal 9.
The inner lid 4 is protected from road surface load.

The rising portion 3 is provided with a rubber ring receiving type invar.
Head type used for the port part 20 and the head type inverted part 2
0, two types of rubber ring sockets are specified, but in any case, a standardized rubber socket for mounting pipes (some necks) is provided between the inverting part 20 and the rising part 3. Swingable rubber ring socket 12).

By the way, the small manhole 1 as described above
In many cases, the mounting pipe 8 is directly joined to the small manhole 1A.

That is, although the direction of the mounting pipe 8 is substantially known (constant), since the height thereof varies, the inclination angle between the inverting portion 20 and the mounting pipe 8 can be freely increased. With the joint 13 interposed, variations in the height (and, of course, the direction) of the mounting pipe 8 are absorbed.

However, in such a small-sized manhole 1A for connecting a connecting pipe, the inclination angle of the universal joint 13 has a limit, which impairs the degree of freedom of the connecting height at the downstream end of the mounting pipe, that is, this mounting. Small manhole 1A for pipe connection
Is not yet a fully versatile small manhole.

[0010] On the other hand, the present applicant, when newly connecting a residential land drainage pipe to an existing PVC small-diameter public square, is intended to have versatility in the height and direction of the connection position at the downstream end of the residential land drainage pipe. It has been proposed that a branch pipe be provided at an arbitrary position of a rising part of a public trout to connect a residential land drain pipe (this is also referred to as a retrofit connection method) (Japanese Patent No. 2930924,
Japanese Utility Model Registration No. 26000314, Japanese Utility Model Registration No. 2590138, Japanese Patent No. 2860065,
Japanese Patent No. 2808244, Japanese Patent Application Laid-Open No. 2001-560
No. 83, etc.) and has been well received.

[0011] In addition, a proposal of a drainage basin using such a retrofitting method (Japanese Utility Model Publication No. 5-26146) is also known.

Therefore, the present inventors have conceived of applying the retrofitting connection method used for the small-diameter public square for joining a general-purpose residential land drainage pipe to the small-sized manhole for joining the mounting pipe.

That is, a small-sized manhole 1B for joining pipes shown in FIG. 3 was devised and commercialized. Since the inverting portion 20 of the small manhole 1B is an insertion-type inverting portion, the rising portion 3 is provided with a rubber ring socket 12, and the branch pipe 14 is joined to the rising portion 3. Provided
An attachment pipe is connected to the branch pipe 14.

The branch pipe 14 may be of any type (see the above-cited publications proposed by the present applicant), but as shown in the figure, the simplest and basic example is a square (circular or oval) flange 15 and A short pipe 16 with a rubber ring socket for a mounting pipe, which is integrally and substantially perpendicularly protruded from the flange 15.

Accordingly, a hole is formed in the rising portion 3 of the existing small manhole 1A in accordance with the height and direction of the downstream end of the mounting pipe at the installation site, and the flange 15 is bonded to the outer surface near the hole by bonding. By doing so, the branch pipe 14 is fixed to the rising portion 3, and then the mounting pipe is inserted into the branch pipe 14.

[0016]

However, in such a small manhole 1B, the mounting height of the branch pipe 14 is, for example, 200 mmφ for the sewage main pipe, 300 mmφ for the pipe diameter of the rising part 3, and converge when the head is 450 mm or more. Although it is possible height, it was newly found that the height is impossible to join when the head is less than 450 mm.

That is, the inverting section 20 and the rising section 3
Since a rubber ring socket 12 required by the standard is interposed between the flanges, the flange 15 of the branch pipe 14 cannot be in close contact with the outer surface of the rising portion 3 due to the rubber ring socket 12. It has been found that it is impossible to join under the rising portion 3.

When the retrofitting method described in Japanese Utility Model Publication No. Hei 5-26146 is applied to the small manhole 1B, the standardized small manhole is not formed, and the branch pipe 14 is not used. In addition, the connection strength with the mounting pipe is insufficient, which is not preferable for a small manhole with a road surface load.

Accordingly, the present invention has as its main object to eliminate such a known problem, and even if the mounting position of the branch pipe 14 is located as low as possible, drainage and filth (solid matter) from the sewage main pipe can be achieved. It is another object of the present invention to provide an inverting portion which does not flow backward to the attachment pipe (or branch line sewer).

[0020]

SUMMARY OF THE INVENTION In order to achieve the above object, the gist of the present invention is as follows. 1) Upstream and downstream trunk sewers are connected, and a rising portion has a rubber ring receiving port. In a small plastic manhole having an inverting portion connected via a cable, a portion of the inverting portion connected to the rising portion is integrally formed in a long shape, and the inverting portion is formed in the long portion. ,
In providing a branch pipe used for a sewer for a branch line by a retrofitting method, the branch pipe can be positioned below so as not to interfere with the rubber ring receiving port. 2) A plastic small manhole having an inverting portion connected to an upper and a lower sewage main line and having a rising portion connected through a rubber ring socket, and The portion on the side connecting the rising portion is integrally formed in a long dimension, and when the branch pipe for the mounting pipe is provided in the long section by the retrofitting method, the branch pipe is lowered so as not to interfere with the rubber ring receiving port. And 3) the inverted inverting main groove for the sewage main as an invert and facing the main groove. Slope side slope The provided, at the top near the said supporting tube side inclined surface, by opening the branch pipe, according to claim 1, characterized in that it has little freedom of the orientation of the lower mounting position of the branch pipe
Or in the plastic small manhole described in 2 above,
4) In a small plastic manhole to which the upper and lower sewage main pipes are connected and the rising portion is connected, the portion of the invert portion on the side connecting the rising portion is long. In order to provide a connecting branch pipe in the elongated portion by a retrofitting method, the inverted part of the inverted main sewer main groove as an invert is formed in the invert part. A small-sized plastic pipe characterized in that a branch pipe-side inclined surface facing the groove is provided, and the branch pipe is opened in the vicinity of the uppermost part of the branch pipe-side inclined surface, whereby the direction of the lower pipe mounting position is slightly liberated. Located in Manhole.

[0021]

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be described in more detail with reference to an embodiment shown in the accompanying drawings. FIG. 1 is an overall view of an embodiment of the present invention,
2 is a main part view of FIG. 1, (A) is a cross-sectional view of FIG.
FIG. 2B is a left side view of a main part of FIG. 1, and FIG. 2C is a right side view of a main part of FIG. 1. In FIG. Description is omitted or simplified.

The small plastic manhole 1 of the present embodiment.
Is a compact manhole for attachment pipe merging (also referred to as a small manhole with attachment pipe) as general as possible.

The small manhole 1 is roughly composed of an invert portion 2, a rising portion 3, an inner lid 4 and a protective lid 5, and the invert portion 2 has an upstream sewage main pipe (not shown). The main line or branch line sewer) 6 is connected to the inverter 2 through a rubber ring socket 17 for the main pipe, which is integral with the inverter 2.
The sewage main pipe 7 with a rubber ring socket for the main pipe on the downstream side is connected to the main pipe outlet 22.

The inner lid 4 and the protective lid 5 are the same as in the conventional example shown in FIG. In addition, the rising portion 3 has
Since the toe portion 2 is in the form of a mouth, it is constituted by a rubber ring mouth shape rising portion 3.

Here, the inverter 2 of the present embodiment is used.
1 (FIG. 1), FIG. 2 (B) and FIG. 2 (C) show a rising portion 18 (i.e., a long portion on the side to which the rising portion 3 is connected). As shown in the figure, a large width (for example, 800 to 900 mm when the diameter of the rising portion 3 is 300 mmφ) is integrally formed (adhesion bonding of an injection-molded product or integrally formed at the time of injection molding). Then, the branch pipe 14 is joined to and attached to the outer periphery of the upright port 18 (or a port).

Therefore, the branch pipe (also called a connection branch pipe)
As long as the flange 15 of the branch pipe 14 does not interfere with the installation surface EL of the inverter 2, the position of the joint 14 in the vertical direction can be freely determined depending on the length of the riser port 18. That is, it can be freely taken from the installation surface EL to the vicinity of the upper end of the pipe.

Therefore, in the case of a simple type in which the rubber ring receiving port 12 is omitted and the rubber ring receiving port 12 is omitted, the inner lid 4 may be provided directly on the insertion port 18 for the rising portion.

The right and left joining position of the branch pipe 14 is set at the upright port as long as the flange 15 of the branch pipe 14 does not interfere with the upper and downstream sewage main pipes 6 and 7 in the inverting section 2. In addition to being able to freely take on the entire outer periphery of the portion 18, even in the case of interfering with the upstream and downstream sewage main pipes 6, 7, the sewage main pipes 6, 7 can be attached to the inverting portion 2 on the side surface side. As wide as possible.

That is, a straight and horizontal pipe axis (center line of the sewage main pipe) of the sewage main pipes 6 and 7 in the invert portion 2 a
2 (A), 2 (B) and 2 (C), are slightly displaced from the vertical tube axis (the center line of the rising portion) b of the outlet portion 18 for the rising portion and the rising portion 3. Minute inverter 2
When the side pipe is enlarged and the branch pipe 14 is bonded and fixed here,
A deflection angle θ as shown in FIG. 2A can be obtained.

For this purpose, the inverting surface (manhole bottom surface) of the inverting portion 2 is composed of a main groove 19 which is an extended curved surface at the bottom of the main pipe, and an inclined surface 21 on the branch pipe side. The uppermost part of the inclined surface 21 is formed at the opening of the branch pipe 14 to a height of about 50 mm above the bottom of the main groove 19 so as to face the main groove 19. Accordingly, the branch pipe-side inclined surface 21 extends over the entire pipe length of the main groove 19.

As a result, even if solid matter (filth) from the upstream sewage main pipe 6 is fixed to the lower end of the branch pipe 14, it is prevented from flowing back toward the branch pipe 14.
It does not accumulate on the side.

In other words, the flange 15 of the branch pipe 14 fixed at the lowest position is connected to the main pipe rubber ring socket (main pipe connection part) 17 for connecting the upper and lower sewage main pipes 6 and 7, and the main pipe plug. In the case where the diameter of the rising portion 3 is 300 mmφ, the swing angle (swing angle) θ of about 5 to 10 ° can be provided without being disturbed by the mouth (connecting portion for main pipe) 22. Will have.

In the small manhole 1 with a mounting pipe of the present embodiment as described above, the invert portion 2 is installed in a predetermined excavation groove of a public road, and then the sewage main pipes 6 and 7 on the upstream and downstream sides are installed. Connecting.
Inlet 1 for rising part rising from this inverting part 2
8, the rising part 3 is inserted, or the inner lid 4 is fitted, and the protective lid 5 is covered.

Since the pedestal 9 of the protective cover 5 is placed on the high-quality soil and crushed stone that have been put into the foundation sand near the invert and compacted, it is easier to re-dig than the natural soil at the time of retrofitting. Can be. Thus, the sewage system is completed.

Next, when a new residential land drain pipe is laid, the mounting pipe is connected to the existing small manhole 1 via a public square. Of course, the mounting pipe may be connected simultaneously with the installation of the small manhole 1.

That is, the small manhole 1 is re-drilled, and a hole is formed in the upright opening 18 in accordance with the height and direction of the downstream end of the mounting pipe. Perform work, connect the mounting pipes, and backfill.

Although the invert portion 2 of the present embodiment is shown as a so-called straight type, the present invention is not limited to this. 30 °, 4
It may be a so-called curved-inverted shape curved at 5 ° or the like.

However, in the case of the curved-point inverted type,
When the branch pipe 14 is bonded and fixed to the outer curved side surface, the deflection angle θ can be further increased.

Although the small-sized manhole 1 of the present embodiment is of a type where the attachment pipes are joined, the present invention is not limited to this.
The present invention can also be applied to the case where the mounting pipe 8 is a branch line sewer.

[0040]

According to the present invention, since the mounting pipe is connected to the small plastic manhole by a retrofit connection method, the use of the small manhole can be diversified. Of course, even if there is a rubber ring socket required by the standard, the vertical mounting position of the sewer for the branch line or the mounting pipe can be liberated, especially it can be lowered, and the plastic small Manho
Can be used for general purposes.

In particular, these universal joints are not required as compared with the conventional sewer pipe for branch lines which is laid by using two universal joints which can take a large inclination angle. Becomes

In addition, the main groove for the sewage main pipe is shifted, so that the branch pipe side inclined surface can be configured to be large, and thus, the mounting position of the branch pipe in the invert portion can be lowered. Also gives some degree of freedom.

[Brief description of the drawings]

FIG. 1 is an overall view of an embodiment of the present invention.

2 is a main part view of FIG. 1, wherein (A) is a cross-sectional view taken along arrow A of FIG. 1, (B) is a left side view of the main part of FIG. 1, and (C) is a right side view of the main part of FIG. It is.

FIG. 3 is a conventional example.

FIG. 4 is a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Small manhole, 2 ... Invert part, 3 ... Rise part, 4 ... Inner lid, 5 ... Protective lid, 6, 7 ... Sewage main pipe, 14 ...
Branch pipe, 18 ... Inlet for rising part

Claims (4)

[Claims] Claims: 1. An upstream and downstream mains sewer is connected,
In addition, in a plastic small manhole having an inverting portion connected to a rising portion through a rubber ring socket, a portion of the inverting portion on the side to which the rising portion is connected is integrated into a long dimension. When the branch pipe used for the sewer for the branch line is provided by the retrofitting method in the long portion, the branch pipe can be positioned below so as not to interfere with the rubber ring receiving port. Plastic small manho
Le. 2. Upstream and downstream sewage mains are connected, and
A rising part is a small plastic manhole having an inverting part connected via a rubber ring socket, and a part of the inverting part on the side to which the rising part is connected is integrally formed in a long shape. A small plastic manhole which is formed so that, when a branch pipe for an attachment pipe is provided on the long portion by a retrofitting method, the branch pipe can be positioned below so as not to interfere with the rubber ring socket. 3. The invert portion is provided with a shifted main sewer main groove as an invert and a branch pipe side inclined surface facing the main groove, and the uppermost part of the branch pipe side inclined surface. 3. The plastic small manhole according to claim 1, wherein the direction of the lower mounting position of the branch pipe is slightly liberated by opening the branch pipe in the vicinity. 4. Upstream and downstream sewage mains are connected, and
In the plastic small manhole to which the rising portion is connected, a portion of the invert portion on the side to which the rising portion is connected is integrally formed in a long shape, and a connection branch pipe is formed in the long portion. In order to be provided by the retrofitting method, the inverted portion is provided with a shifted main sewer main groove as an invert and a branch pipe side inclined surface facing the main groove. A small plastic manhole, characterized in that the direction of the lower mounting position of the branch pipe is slightly liberalized by opening the branch pipe near the uppermost portion of the plastic pipe.