JPH08144307A - Pipe fitting for manhole stack - Google Patents

Abstract

PURPOSE: To easily connect stacks to construct a manhole to each other and also enable connection even if the wall thickness of a stack is different from that of the other stack. CONSTITUTION: When a shaft 21 is formed between a buried pipe 10 and ground surface, a stack 23 on the underside of it is inserted vertically into the shaft 21, and connected to the inner pipe 13 of the buried pipe 10. Also the lower part of a partition in a clearance between an outer tube part and an inner tube part of a pipe fitting 30 is fitted closely into the upper end part of the stack 23, and the upper end surface of the stack 24 is placed against damping material. Then a ring-shaped seal material is inserted between the inner tube part of the pipe fitting 30 and the stack 24. Under these conditions, the stack 23 on the upper side of it is fitted closely into the upper side section of the partition in a clearance between the outer tube part and inner tube part of the pipe fitting 30, and the lower end surface of the stack 24 is placed against damping material. Finally a ring-shaped seal material is inserted between the inner tube part of the pipe fitting 30 and the stack 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manhole for communicating a conduit buried in a relatively deep position on the surface of the earth and a surface of the manhole formed by a plurality of standing pipes made of plastic or the like. The present invention relates to a pipe joint used for connecting pipes to each other.

[0002]

2. Description of the Related Art When a buried conduit is formed in the ground, a manhole that connects the buried conduit and the surface of the earth is formed for maintenance and inspection of the buried conduit. Recently, a method of constructing a manhole by using a plastic standpipe has been adopted instead of a method of constructing a manhole with heavy reinforced concrete.

[0003]

When constructing a manhole using a plastic standpipe, a relatively short standpipe can be used if the buried pipeline is buried at a relatively shallow position with respect to the surface of the earth. Can be used. Therefore, in this case, it suffices to arrange one relatively short vertical pipe so as to reach the buried pipeline from the surface of the earth, and the work can be easily performed. However, if the buried pipeline is buried deep in the surface of the earth, when constructing a manhole with a single vertical pipe, a long vertical pipe reaching the buried pipeline from the surface must be used. Moreover, it is not easy to arrange the vertical pipe in the ground in the vertical state.

Further, in the constructed land, the buried pipeline may be formed in advance by laying soil on the previously laid pipeline. In such a case, the buried pipeline is It is necessary to connect the standing pipe for communicating with the surface of the earth to the buried pipe line in advance before the soil is stacked, and to support the standing pipe in a vertical state.

However, in this case as well, in order to construct a manhole with a single vertical pipe, it is necessary to support a long vertical pipe in a vertical state in advance, and there is a problem that the work is not easy.

Japanese Patent Laid-Open No. 55-32853 discloses a manhole in which a relatively thin-walled standing pipe made of plastic is divided into upper and lower parts, and an upper standing pipe is slidably connected to a lower standing pipe. A structure is disclosed.

However, in this manhole structure, the upper standing pipe, to which the weight of the vehicle or the like is applied, is constructed so as to be slidable with respect to the lower standing pipe, and when the buried pipeline is at a deep position. For this, a long vertical pipe must be used.

To solve such a problem, there is also a method of constructing a manhole by connecting a plurality of standing pipes with a pipe joint. For example, the spouts are connected to each other by forming a spout at one end of one stand pipe, forming a receiving end at the end of the other stand pipe, and inserting the spout into the receiving port. However, in this case, there is a problem that only the standing tubes having the receiving ports can be used, and the standing tubes having different thicknesses cannot be connected to each other. Moreover, when the standing pipe is in contact with the surrounding soil, and if the outer peripheral surface of the connected standing pipe projects significantly outward, the standing pipe will sink due to the effect of surrounding ground subsidence. May occur.

The present invention solves such a problem, and an object thereof is to construct a manhole by a plurality of standing pipes in a buried pipeline buried deep in the surface of the earth. An object of the present invention is to provide a pipe joint for a standing pipe for a manhole, which can easily connect the standing pipes to each other. Another object of the present invention is to provide a pipe joint for a vertical pipe for manholes, which can connect vertical pipes having different thicknesses. Still another object of the present invention is a pipe joint for a standing pipe for a manhole, in which even if each standing pipe is in contact with the surrounding soil, the standing pipe is not affected by the subsidence of the surrounding ground and sinks. To provide.

[0010]

A pipe joint for a standing pipe for a manhole according to the present invention comprises a plurality of standing pipes for a manhole when a manhole for communicating a buried pipeline with a ground surface is formed.
A pipe joint of a standing pipe for a manhole used for connecting each standing pipe to each other, and a cylindrical outer cylinder part having an outer diameter slightly larger than an outer diameter of the standing pipe to be connected, A cylindrical shape that is concentrically arranged in the outer cylinder part, has an inner diameter slightly smaller than the inner diameter of the standing pipe to be connected, and the ends of each standing pipe are fitted between the outer cylinder part Of the inner cylinder portion and a partition wall portion that connects the central portions of the outer cylinder portion and the inner cylinder portion in the axial direction and divides the gap between the two in the axial direction. By doing so, the above object is achieved.

[0011]

In the pipe joint for a standing pipe for a manhole of the present invention, the upper end of the standing pipe vertically connected to the buried pipe is inserted into the gap between the outer tubular portion and the inner tubular portion, and the standing pipe is placed on the partition wall portion. The upper end surface of the pipe is abutted. In this state, the lower end of the upper standing pipe is inserted between the outer and inner cylindrical parts of the pipe fitting attached to the upper end of the standing pipe, and the lower end surface of the standing pipe serves as the partition wall. It will be in a state of being struck. As a result, the vertical pipes in the vertical state are connected by the pipe joint.

[0012]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view showing an example of a manhole structure configured using a pipe joint for a standing pipe for a manhole of the present invention. As shown in FIG. 1, this manhole structure 2
0 is the tunnel 1 that was first lined by the shield method
The buried pipeline 10 in which the inside of the shield 12 of No. 1 is secondarily lined with an insertion tube 13 made of glass fiber reinforced plastic mortar
Is provided for. In the shield method, the inner peripheral surface of the tunnel 11 formed between vertical shafts (not shown) is lined with a shield 12 composed of a plurality of flat plate-shaped segments curved in an arc shape. Then, when the insertion tubes 13 made of a glass fiber reinforced plastic mortar tube are sequentially inserted into the shield 12 from one of the shafts and the inserted insertion tubes 13 are connected to each other, the insertion tube 13 and the shield 12 are connected. A back-filling material 14 such as air mortar is filled between them and the inside of the shield 12 is secondarily lined.

A manhole structure 20 is constructed in the buried pipeline 10 which has been subjected to the secondary lining in such a manner with an appropriate interval. This manhole structure 20 is a tunnel 1 from the surface of the earth.
1 In a vertical shaft 21 formed to reach the shield 12 lining the inner peripheral surface, a pair of vertical pipes 23 made of lightweight and high-strength glass fiber reinforced plastic mortar pipe are provided by the pipe joint 30 of the present invention. It is connected and in a vertical position. The inner peripheral surface of the vertical shaft 21 is covered with the formwork 22 over the entire circumference, and the lower end of the formwork 22 is
It is abutted against the outer peripheral surface of the upper portion of the shield 12.

A pair of vertical tubes 23 inserted in the vertical shaft 21
Is in a state of being appropriately spaced from the formwork 22, and the lower end portion of the lower standing pipe 23 has an opening portion provided on the shield 12 for lining the inner peripheral surface of the tunnel 11. 12a and the inside of the opening 14 provided in the backfill material 14 with appropriate gaps, respectively, and are abutted against the upper outer peripheral surface of the insertion tube 13
It is supported by 3.

The lower end surface of the lower standing tube 23 is recessed in an arc shape so as to be aligned with the upper outer peripheral surface of the insertion tube 13. Then, the upper portion of the insertion tube 13 that covers the lower end surface of the lower standing tube 23 is removed in a circular shape to form an opening 13a, and the opening 13a forms the insertion tube 13
And the lower standing pipe 23 communicate with each other. Upper tube 2
The upper end surface of 3 is slightly lower than the ground surface.

As shown in FIG. 2, the pipe joint of the present invention for connecting the upper standing pipe 23 and the lower standing pipe 23 is larger than the outer diameters of the upper and lower standing pipes 23 to be connected. The outer cylinder part 31 has a slightly larger inner diameter, and the outer cylinder part 31 has an inner cylinder part 32 in a concentric cylindrical shape. The inner diameter of the inner tubular portion 32 is slightly smaller than the inner diameter of each of the upper and lower standing pipes 23 to be connected. The central portions of the outer tubular portion 31 and the inner tubular portion 32 in the axial direction are connected by a partition wall portion 33, and the gap between the outer tubular portion 31 and the inner tubular portion 32 is bisected in the axial direction.

A cushioning material 34 made of an elastic material such as rubber is attached to the upper and lower surfaces of the partition wall 33.

The upper end of the lower standing pipe 23 is fitted in the space below the partition wall 33 in the gap between the outer cylinder portion 31 and the inner cylinder portion 32, and the lower surface of the partition wall portion 33 is fitted. The cushioning material 34 attached to the upper end is abutted against the upper end surface of the standing pipe 23. In such a state, the upper vertical pipe 23 that is vertically loaded into the vertical shaft 21 is placed in the space between the outer tubular portion 31 and the inner tubular portion 32 above the partition wall portion 33.
The lower end of is fitted. The lower end surface of the upper standing tube 23 is abutted against the cushioning material 34 attached to the upper surface of the partition 33.

In this way, each vertical pipe 23 is connected to the pipe joint 3
When it is in a state of being connected to 0, a ring-shaped sealing material 36 made of water-expanded rubber is provided between the lower standing pipe 23 and the inner tubular portion 32 of the pipe joint 30 under the inner tubular portion 32. While being inserted from the side, a ring-shaped sealing material 36 made of water-expanded rubber is inserted from the upper side of the inner tubular portion 32 between the upper pipe 23 and the inner tubular portion 32 of the pipe joint 30. It

A plurality of partition plates 35 made of, for example, chevron steel are provided at the central portion in the vertical direction on the inner peripheral surface of the inner tubular portion 32. Each partition plate 35 has an inner cylindrical portion 3
It has a length shorter than the inner diameter of 2, and is installed horizontally on the inner peripheral surface of the inner cylindrical portion 32 at equal intervals in the circumferential direction.

When the pair of vertical pipes 23 are connected to each other by the pipe joint 30, a lightweight backfill of air mortar or the like is provided between each vertical pipe 23 and the form 22 covering the inner peripheral surface of the vertical shaft 21. The material 24 is filled. The lightweight backfill material 24 is
The opening 12a of the shield 12 is passed through the lower end of the standing pipe 23.
It is filled inside and inside the opening 13 a of the backfill material 13. Lightweight back-filling material 24 is a specific gravity of about small 0.8 t / m ³ than the specific gravity 1.8 t / m ³ of soil, moreover, is suitable air mortar having appropriate hardness in a state of cured.

A manhole structure 2 is provided on the upper end surface of the standing pipe 23.
A pedestal 25 on which a 0 lid is placed is placed. The pedestal 25 is formed of, for example, cast iron into a flat plate shape, and has an opening 25a formed in the center thereof. Then, on the upper surface of the pedestal 25, a disc-shaped lid 26 made of cast iron is formed.
Is placed to cover the opening of the pedestal 25. The periphery of the pedestal 25 is filled with soil or the like.

The manhole structure 20 having such a structure is
It is manufactured as follows. After the inner peripheral surface of the tunnel 11 is lined with the shield 12 by the shield construction method, the insertion tube 13 made of glass fiber reinforced plastic mortar is shielded by the secondary lining.
When the buried conduit 10 is formed by inserting the backfill material 14 between the insertion tube 13 and the shield 12, the vertical shaft reaching the shield 12 from the surface of the earth at the point where the manhole structure 20 should be formed. 21 is formed. Then, the inner peripheral surface of the formed vertical shaft 21 is covered with the form 22. The mold 22 is abutted against and supported by the outer peripheral surface of the upper portion of the shield 12.

In this state, an opening 12a is formed in the upper part of the shield 12 covering the lower end surface of the vertical shaft 21, and an opening is formed in the backfill material 14 filled between the shield 12 and the insertion tube 13. 14a is formed. The outer peripheral surface of the insertion tube 13 is exposed in the opening 14 a of the backfill material 14 and the opening 12 a formed in the shield 12.

Thereafter, a lower standing tube 23 made of glass fiber reinforced plastic mortar is vertically inserted into the vertical shaft 11 so that the lower end of the standing tube 23 has an opening 12a of the shield 12 and a backfilling material 14. The lower end surface of the lower standing tube 23, which is inserted into the opening 14a of the above, and which is recessed in an arc shape is abutted against the upper outer peripheral surface of the insertion tube 13. An opening 13a is formed in the upper part of the inner insertion tube 13 that covers the lower end opening of the lower stand tube 23, and the lower stand tube 23 and the inner tube 13 are in communication with each other by the opening 13a. To be done. After that, between the outer peripheral surface of the inner insertion tube 13 and the lower end surface of the stand tube 23,
It is properly sealed.

In such a state, the lower standing pipe 23
The pipe joint 30 is attached to the upper end of the. The pipe joint 30 is
Partition wall 33 in the gap between the outer tubular portion 31 and the inner tubular portion 32
The lower part is fitted to the upper end of the lower standing pipe 23, so that the lower standing pipe 23 is mounted. Then, the ring-shaped sealing material 36 is pushed between the lower standing pipe 23 and the inner cylindrical portion 32 of the pipe joint 30 to stop the water between them.

After that, the lower end of the upper standing pipe 23 is inserted into the upper portion of the partition pipe 33 in the gap between the outer tubular portion 31 and the inner tubular portion 32 of the pipe joint 30 attached to the lower standing pipe 23. To be done. Then, the ring-shaped sealing material 36 is pushed between the upper pipe 23 on the upper side and the inner cylindrical portion 32 of the pipe joint 30 to stop the water between them.

In this way, the pipe joint 3 is provided in the vertical shaft 21.
When the pair of vertical pipes 23 connected by 0 are arranged in a vertical state, air mortar or the like is provided between the outer peripheral surface of each vertical pipe 23 and the inner peripheral surface of the form 22 that covers the inner peripheral surface of the vertical shaft 21. Lightweight backfill material 24 is filled. The lightweight backfill material 24 includes the opening 12 a of the shield 12 and the opening 14 of the backfill material 14.
The pair of upright pipes 23, which are also filled in the inside a and are connected by the pipe joint 30, are stably supported by the lightweight backfill material 24 throughout.

When the lightweight backfill material 24 is cured, the pedestal 25 is placed on the upper standing tube 23, and the lid 26 is placed on the upper surface thereof. Then, the periphery of the pedestal 25 is filled with soil or the like.

As described above, since the pair of upright pipes 23 are connected by the pipe joint 30, the manhole can be easily constructed even if the buried pipeline 10 is buried at a deep position with respect to the ground surface. it can. In the pipe joint 30, since the end portions of the standing pipes 23 are fitted to the upper and lower portions of the gap between the outer tubular portion 31 and the inner tubular portion 32 partitioned by the partition wall 33, respectively, Even if the standing tubes 23 have different thicknesses, the standing tubes 23 can be reliably connected to each other.
In a state where the standing pipes 23 are connected to each other by the pipe joint 30, the outer peripheral surfaces of the standing pipe 23 and the pipe joint 30 have almost no unevenness.

Further, since a plurality of partition plates 35 are laid horizontally on the inner peripheral surface of the pipe joint 30, each partition plate 35 is used as a step when moving up and down in the stand pipe 23. Can be used.

Further, in the partition wall portion 33 that divides the gap between the outer tubular portion 31 and the inner tubular portion 32 of the pipe joint 30 into the partition wall 33, a cushioning material 34 is provided between the partition wall 33 and the end surface of each standing pipe 23. Since the upper stand pipe 23 is provided, the load applied to the lower stand pipe 23 is reduced even if the load of the vehicle or the like is applied to the upper stand pipe 23. Therefore, the inner tube 13 in which the lower standing tube 23 is supported
The impact applied by the load of the vehicle is significantly reduced.

In the above embodiment, a vertical shaft 21 is formed in the buried pipeline 10 buried in the ground, and the vertical shaft 21 is formed.
A plurality of standing pipes 23 are inserted into the inside, and the standing pipes 23 are connected to each other by the pipe joint 30, but instead of such a structure, a buried pipeline is laid on the newly constructed land. Then, the pipe joint of the present invention can be used also when constructing a manhole.

FIG. 3 shows how the pipe joint of the present invention is used in such a case. The lower standing pipe 23 is, for example, in advance with respect to the buried pipeline laid in the exposed state,
It is supported in a vertical state, and in such a state, soil is laminated around the lower standing pipe 23. Then, when the lower standing pipe 23 is embedded with soil to a state where the upper end remains, the pipe joint 30 having the same configuration as that of the above-described embodiment is attached to the upper end of the lower standing pipe 23. The ring-shaped seal member 3 is provided between the outer tube portion 31 of the pipe joint 30 and the lower standing pipe 23.
6 is inserted from the lower side of the pipe joint 30.

In such a state, the pipe joint 30 is
The lower end portion of the upper standing pipe 23 is fitted, and the ring-shaped sealing material 36 is inserted from the upper side of the pipe joint 30 between the outer cylinder portion 31 of the pipe joint 30 and the upper standing pipe 23. . And
Soil is laminated around the standing pipe 23 so that the upper standing pipe 23 is filled with soil.

In this case, since the standing pipes 23 connected by the pipe joint 30 are directly embedded in the soil, they are in contact with the surrounding soil. However, each standing pipe 2
Since there is almost no unevenness on the outer peripheral surface of the connecting portion between the pipe 3 and the pipe joint 30, even if the surrounding ground sinks, there is no possibility that the standing pipes 23 connected to the pipe joint 30 will sink.

[0037]

The pipe joint for the standing pipe for manhole of the present invention is
As described above, since the end portions of the pair of standing tubes are respectively inserted between the outer tube portion and the inner tube portion so that the standing tubes are connected to each other, the standing tubes can be connected to each other. They can be easily connected to each other. Therefore, even when the buried pipeline is deeply buried in the ground, the manhole can be easily constructed by the plurality of standing pipes. Further, in the pipe joint of the present invention, since the end portions of the standing pipes are respectively inserted into the gaps between the outer tubular portion and the inner tubular portion, the thickness of each standing pipe to be connected is Even if they are different, each vertical pipe can be connected without any trouble. Furthermore, the connecting portion between the pipe joint of the present invention and each standing pipe has small unevenness, and even if each standing pipe is directly buried in the ground, there is almost no possibility of being affected by surrounding ground subsidence. Absent.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of a manhole constructed using a pipe joint for a standing pipe for a manhole of the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part of a pipe joint of a standing pipe for a manhole of the present invention used for the manhole.

FIG. 3 is a cross-sectional view of a main part showing a different usage state of the pipe joint of the standing pipe for a manhole.

[Explanation of symbols]

 10 Buried Pipeline 11 Tunnel 12 Shield 13 Internal Tube 14 Backfilling Material 20 Manhole Structure 21 Vertical Shaft 22 Formwork 23 Standpipe 24 Lightweight Backfilling Material 30 Pipe Joint 31 Outer Cylinder 32 Inner Cylinder 33 Partition Wall 34 Cushioning 35 Partition Board 36 sealant

Claims (1)

[Claims] 1. When constructing a manhole that connects a buried pipeline and the surface of the earth with a plurality of standing pipes for manholes,
A pipe joint of a standing pipe for a manhole used for connecting each standing pipe to each other, and a cylindrical outer cylinder part having an outer diameter slightly larger than an outer diameter of the standing pipe to be connected, A cylindrical shape that is concentrically arranged in the outer cylinder part, has an inner diameter slightly smaller than the inner diameter of the standing pipe to be connected, and the ends of each standing pipe are fitted between the outer cylinder part And a partition wall portion that connects axially central portions of the outer tubular portion and the inner tubular portion and divides a gap between them into two in the axial direction. Pipe fittings.