JPH0826579B2 - Sewage mounting pipe embedding method and mounting socket used for the method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction method for connecting and burying a sewer mounting pipe to an underground buried pipe such as a sewer main, and a mounting socket for connecting the sewer mounting pipe and the sewer main. is there.

[0002]

2. Description of the Related Art A conventional method for connecting and burying a sewer installation pipe to an existing sewer main is a so-called excavation method for excavating the entire area from the ground. This excavation method is an economical construction method, but on the other hand, the excavation loosens the ground, which causes tilting of houses, etc., requires traffic interruption during construction, and prolongs the construction period. At present, the non-open cutting method is being tried instead of the open cutting method.

In this non-open cutting method, a method of connecting and burying a sewer installation pipe in a sewer main is often used in the following procedure.

A vertical hole is formed by excavating from the ground to the sewer main using a boring machine, and a casing pipe having a cutter at its tip is inserted into the vertical hole. When excavating a vertical hole, in order to treat the sludge generated by boring, water is sprayed on the excavated surface,
The pressure of this water discharges the sludge to the ground.

When the vertical hole reaches the wall surface of the sewer main, the casing pipe is rotated while applying pressure so that the casing pipe bites into the wall surface of the sewer main to connect them.

Next, the perforating tool is inserted into the casing pipe, a through hole having a diameter substantially the same as the diameter of the sewer mounting pipe is bored in the wall surface of the sewer main, and the perforating tool is removed.

A sewage mounting pipe having a mounting socket attached to the tip is inserted into a through hole formed in the main sewer pipe. A tapered surface is formed on the outer peripheral portion of the mounting socket, and when the mounting socket is inserted into the through hole, the tapered surface abuts the through hole and locks the mounting socket to the sewer main.

A filler is filled in the gap between the sewage attachment pipe and the casing pipe to fix them.

The joint between the main sewer pipe and the sewer mounting pipe is subjected to caulking with an adhesive or the like from the inside of the main sewer pipe to provide a water-stop finish.

[0010]

However, the non-open cutting method as described above has the following drawbacks.

That is, when the boring machine is used for excavation up to the main sewer, the boring machine has a weak boring capability and takes a long time to excavate. This problem can be solved by using a large boring machine, but when constructing a sewage installation pipe, it is necessary to move the boring machine appropriately to the construction site, and because of the road width etc. Sometimes it is necessary to work in a small space. Therefore, there is a limit to the size increase of the boring machine in terms of movement of the boring machine, installation location, and the like. In addition, in a boring machine, a method of discharging sludge to the ground by injecting water on the excavation surface is used to treat the sludge accompanying excavation. Tended to loosen, which eventually led to the collapse of the ground.

The mounting socket having a tapered surface used for connecting the main sewer pipe and the sewer mounting pipe is mounted by bringing the tapered surface into contact with the through hole formed in the main sewer pipe. When a vertical impact is applied to the sewer installation pipe, the impact is directly transmitted to the sewer main. This impact causes separation of the contact portion of the sewer main that joins with the mounting socket, and also causes the sewer mounting pipe to drop into the sewer main. Also,
The contact portion is subjected to a caulking finish (water-stopping finish) with an adhesive or the like from the inside of the sewer main pipe, but the water-stopping effect is reduced due to the peeling of the contact portion.

Further, in this non-open cutting method, there is a problem that the construction cost is considerably higher than that of the open cutting method because the casing pipe is buried and the construction takes a long time. there were.

The present invention has been made in view of the above problems, and has a special structure for excavating the ground using an earth auger having a high drilling ability and for connecting the sewer mounting pipe and the sewer main. By using a mounting socket that has a sewage mounting pipe with the purpose of shortening the construction period, improving the water blocking effect of the connection part between the sewage mounting pipe and the sewer main, and further reducing the construction cost. An object is to provide an embedding method and a mounting socket used for the method.

[0015]

In order to achieve the above object, the method for embedding a sewer pipe according to the present invention excavates the ground using an earth auger, and a casing pipe is inserted into a space created by the excavation by a pipe presser. The first step of press-fitting the water until it reaches the main sewer pipe, the second step of forming a through hole in the wall surface of the main sewer pipe, and the mounting socket with the tip of the sewer mounting pipe inserted into the mounting socket. Third step of inserting a part of the casing into the through hole, a fourth step of filling a filler between the outer circumference of the sewage attachment pipe and the inner circumference of the casing pipe, and pulling out the casing pipe to the ground. Consisting of a fifth step, wherein the mounting socket is
A locking piece is provided on the outer periphery of the hollow cylindrical main body,
A sealant having water swelling property is fixed to the outer circumference of the main body portion below the locking piece, and the inner circumference of the main body portion above the locking piece is larger than the outer circumference of the sewer mounting pipe. A step-shaped shoulder portion is formed by a large-diameter upper portion and an inner periphery thereof having a smaller diameter than the outer periphery of the sewage mounting pipe,
An annular cushion material having elasticity is fixed to the shoulder portion, and the lowermost end surface of the sewage mounting pipe inserted into the upper portion is in contact with the shoulder portion via the cushion material. A ring-shaped water stop ring having elasticity is provided around the inner peripheral surface of the upper portion, and is in close contact with the outer peripheral surface of the sewage mounting pipe and the inner peripheral surface of the upper portion. In 3 steps,
The locking piece is brought into contact with a peripheral portion of the through hole, and a main body portion below the locking piece is fitted and inserted into the through hole. It is used with the tip of the sewer installation pipe inserted, and by inserting its own tip into the through hole newly drilled in the existing sewer main, the sewer main in the buried state A mounting socket for connecting the sewage mounting pipe, wherein the mounting socket has a flange-shaped locking piece projectingly provided on an outer periphery of a hollow cylindrical main body, and the main body section below the locking piece. A sealing material having water swelling property is fixed to the outer periphery of
The main body above the locking piece has a stepped shape with an inner periphery having an upper portion having a larger diameter than the outer periphery of the sewage mounting pipe and an inner periphery having a lower portion having a smaller diameter than the outer periphery of the sewage mounting pipe. Is formed on the inner peripheral surface of the upper portion, and an elastic ring-shaped water stop ring is formed on the inner peripheral surface of the upper portion. The inner circumference is smaller than the outer diameter of the sewage attachment pipe.
In these inventions, in the main body portion above the locking piece,
Since there is no tapered portion between the upper portion and the lower portion, a stepped shoulder portion is formed at the connecting portion between the upper portion and the lower portion. That is, since the shoulder portion is formed in an annular shape orthogonal to the axis of the main body portion, the lowermost end surface of the sewage attachment pipe is firmly contacted with the shoulder portion via the cushion material, There is no risk that the sewer mounting pipe will fit into the lower part. In the following description, the body portion is referred to as a connecting pipe, and the annular cushion material is referred to as a cushion ring. Further, the body portion above the locking piece is referred to as an upper mounting portion, and the lower body portion is referred to as a lower mounting portion.

[0016]

[Action]

A: Sewer mounting pipe embedding method When excavating a construction site, excavation of the ground and press fitting of the casing pipe are performed simultaneously. In the excavation by the earth auger, the sludge generated by the excavation is discharged to the ground while being wound around the spiral blade of the earth auger. When installing the sewage installation pipe to the sewer main, a sealing material having water swelling property is attached to the installation socket attached to the tip of the sewage installation pipe, so the installation socket is inserted into the through hole. Only then, the water-swellable sealing material absorbs water and expands, so that the mounting socket and the through hole are closely joined.

B: Mounting Socket The sewer mounting pipe is inserted into the mounting portion above the mounting socket. At this time, the tip of the water blocking ring projectingly provided in the mounting portion is brought into close contact with the surface of the sewage mounting pipe due to its elasticity to obtain a water blocking effect. In addition, the sewer mounting pipe is
It is inserted up to the shoulder portion of the mounting portion and pressure-bonded to the elastic cushion material provided around the shoulder portion. Thereby, the shock in the vertical direction applied to the sewer mounting pipe is absorbed by the cushion material.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for embedding a sewer mounting pipe according to the present invention will be described below with reference to the drawings.

The sewage mounting pipe embedding method according to the present invention is
As shown in FIG. 1, a step of forming a vertical hole up to the sewer main 3 and embedding a casing pipe 4 in the vertical hole using a hydraulic drilling machine 2 using a small backhoe 1 as a base machine, and FIG. As shown, it comprises a step of forming a through hole 5 in the sewer main pipe 3 and then attaching a sewage attachment pipe 7 in which an attachment socket 6 is attached to the through hole 5.

A backhoe 1 used as a base machine has a hydraulic drilling machine 2 attached to the tip of an arm. The hydraulic drilling machine 2 is composed of an earth auger 8 and a pipe press-fitting machine 9, both of which are operated by the hydraulic pressure of the backhoe 1.

As shown in FIG. 4, the mounting socket 6 includes a connecting pipe 10 made of a hollow cylinder, and the connecting pipe 10.
And a locking piece 11 provided on the outer periphery at the substantially center of the axial direction. The connecting pipe 10 is partitioned into the upper mounting portion 10a and the lower mounting portion 10b of the locking piece 11 by providing the locking piece 11. Upper mounting part 10a
The inner diameter of the upper end portion is slightly larger than the outer diameter of the sewage mounting pipe 7, and a water stop ring 12 and a cushion ring 13 each made of a member having elasticity are provided around the inner peripheral surface thereof. The water stop ring 12 is provided around the inner peripheral surface of the mounting portion 10 a and projects in the axial direction of the connecting pipe 10. The cushion ring 13 is attached to a shoulder portion 10c provided on the inner peripheral surface of the mounting portion 10a. Further, a cushion ring stopper portion 14 protruding upward is provided around the peripheral portion of the shoulder portion 10c. On the other hand, the outer diameter of the mounting portion 10b is slightly smaller than the inner diameter of the through hole 5 formed in the sewer main 3, and a sealing material 15 having water swelling property is attached to the peripheral surface thereof. .

The procedure of the sewage mounting pipe embedding method using the backhoe 1 and the mounting socket 6 configured as described above will be described below.

As shown in FIG. 1, pavement A at the construction site
After the removal, the hydraulic drilling machine 2 using the backhoe 1 as a base machine simultaneously excavates the sewer main 3 and press-fits the casing pipe 4. The excavation is performed by rotating the earth auger 8 of the hydraulic drilling machine 2. On the other hand, the casing pipe 4 is press-fitted by sequentially press-fitting the casing pipe 4 by the pipe press-fitting machine 9 into the vertical holes sequentially formed by excavation.

As shown in FIG. 2A, when the tips of the earth auger 8 and the casing pipe 4 reach the surface of the sewer main 3, the rotation of the earth auger 8 is stopped and the casing pipe 4 is moved to the sewer main. It adheres to the wall surface of 3. The tip portion of the casing pipe 4 is preliminarily processed so as to conform to the shape of the surface of the sewer main 3 to be attached. The earth auger 8 excavated to the wall surface of the sewer main 3 is then withdrawn.

As shown in FIG. 2 (b), after removing the earth auger 8, a concrete core drill (piercing tool) 16 is inserted into the casing pipe 4 and a through hole 5 is bored in the wall of the sewer main 3. Set up. The diameter of the through hole 5 is slightly larger than the outer diameter of the mounting portion 10b below the mounting socket 6. The concrete core drill 16 is attached to the tip of the rotating shaft 17. In addition, the rotary shaft 17
Are provided with guides 18 formed of convex protrusions at predetermined intervals. The tips of the guides 18 are brought into contact with the inner surface of the casing pipe 4 and prevent the piercing position of the sewer main pipe 3 from being shaken by the rotation of the rotary shaft 17. The concrete core drill 16 is extracted after the through hole 5 is formed in the wall surface of the sewer main pipe 3. At this time, the wall surface portion of the sewer main 3 cut by the concrete core drill 16 is attached to the concrete core drill 16 by a fastener (not shown) provided on the concrete core drill 16, and is pulled out to the ground together with the concrete core drill 16. .

As shown in FIG. 2 (c), after the concrete core drill 16 is pulled out, the sewage mounting pipe 7 having the mounting socket 6 attached to the tip in advance is inserted into the casing pipe 4. Then, the mounting portion 10b below the mounting socket 6 is fitted into the through hole 5 formed in the wall surface of the sewer main 3, and the sewer mounting pipe 7 and the sewer main 3 are connected. When fitting the mounting socket 6, the locking piece 11 provided on the outer periphery of the mounting socket 6 is inserted until it comes into close contact with the wall surface of the sewer main pipe 3 and stops. The shape of the locking piece 11 is formed so as to match the shape of the wall surface of the sewer main 3 in advance. On the other hand, since the sealing material 15 having water swelling property is attached to the peripheral surface of the mounting portion 10b, after the mounting socket 6 is connected to the sewer main 3, the sealing material 15 absorbs moisture and expands. By doing so, both are closely joined (see FIG. 3).

As shown in FIG. 2 (d), the sewer mounting pipe 7
After connecting the sewage main pipe 3 and the sewage main pipe 3, a clay-like bentonite material B is filled in the gap formed between the sewage attachment pipe 7 and the casing pipe 4. Then, as shown in FIG. 2 (e), the casing pipe 4 is pulled out. By pulling out the casing pipe 4, a new gap is created between the bentonite material B previously filled and the ground C, and the bentonite material B is further filled in this gap to form the sewage mounting pipe 7
The embedding work of is finished.

The present invention is not limited to the above embodiment, and can be modified in design as appropriate. For example, the base machine used for excavating the ground is not limited to the backhoe, as long as it can drive the earth auger, and the vertical hole excavated by the earth auger is
It does not have to be vertical, and it is possible to provide the inclination with a backhoe.

[0029]

As described in detail above, according to the present invention,
Various excellent effects as listed below can be obtained, the construction period of the connecting and burying work of the sewage mounting pipe can be shortened, and a mounting socket having a high water blocking effect can be provided.

(1) By using an earth auger for excavating the ground, and simultaneously performing the excavation and the step of press-fitting the casing pipe, it is possible to shorten the construction period of the work for connecting and burying the sewer mounting pipe.

That is, the earth auger has a better drilling ability than the boring machine, and not only can the time required for excavation be shortened, but also the sludge generated by the excavation is wound around the blade of the earth auger. Therefore, the work of spraying water to treat the sludge becomes unnecessary.

Further, since the casing pipe is press-fitted simultaneously with the excavation, the step of inserting the casing pipe after removing the boring machine becomes unnecessary.

Further, in the present invention, the tip of the casing pipe pre-processed to fit the wall surface of the sewer main is press-fitted into the vertical hole and abuts against the sewer main to connect the sewer installation pipe and the sewer main. It is to do work.
With this, conventionally, after connecting the casing pipe to the sewer main by cutting it with the cutter provided at the tip of the casing pipe, the sewer installation pipe and the sewer main are connected, so even after the work is completed. The casing pipe that has been buried can be pulled out and removed after the work is completed.

(2) The mounting socket used for connecting the sewage main pipe and the main sewer is equipped with a water-swellable cushion ring, a locking piece, and a sealing material, so that the wall surface of the main sewer is separated and sewer While preventing the mounting pipe from falling off,
Enhance the water blocking effect at the connection between the sewer installation pipe and the sewer main.

That is, the tip of the sewage mounting pipe mounted on the upper mounting portion is crimped to a cushion ring provided around the inner peripheral surface of the mounting portion above the mounting socket. Thus, even if a vertical impact is applied to the sewer mounting pipe, most of the impact is absorbed by the cushion material. Therefore, no shock is transmitted to the joint between the sewer installation pipe and the sewer main,
The risk of peeling of this bonded portion is reduced.

Further, the locking piece of the mounting socket is provided so as to project from the peripheral surface of the mounting socket, and when the mounting socket is fitted into the sewer main, it is brought into contact with the wall surface of the sewer main to sewer the sewer. Lock to mains. Therefore, even if a vertical impact is applied to the sewer installation pipe, the impact is dispersed on the wall surface of the sewer main. This also reduces the risk of the sewer installation pipe falling into the sewer main.

Further, the connection between the sewer main pipe and the sewer main is made by inserting the mounting part below the mounting socket into the through hole of the sewer main, but on the peripheral surface of the lower mounting part. Has a water-swelling sealant attached. As a result, when water penetrates into the lower mounting portion fitted into the through hole of the sewer main, the sealing material expands and the space formed between the lower mounting portion and the through hole is closed without a gap. Will be filled. Therefore, after the connection between the sewer installation pipe and the sewer main is completed, it is possible to completely stop the water at the joint between the sewer main and without caulking.

(3) Further, in the conventional non-cutting method, the construction cost is considerably higher than that of the cutting method because the casing pipe is buried and the construction requires a long period of time. There was a problem such as.

However, according to the present invention, the casing pipe can be removed after the connection work between the sewage installation pipe and the sewer main pipe is completed, and the process of connecting and burying the sewage installation pipe is small. At the same time, since the construction period is short, it is possible to complete the connection and burying work of the sewage mounting pipe at a cost almost the same as the conventional excavation method.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a stratum showing an embodiment of a method for embedding a sewer mounting pipe.

[Fig. 2] Cross-section of the stratum showing the procedure of the embedding method for the sewer mounting pipe

FIG. 3 is an enlarged cross-sectional view showing a connection state with a mounting socket.

FIG. 4 is a partially cutaway perspective view showing an embodiment of a mounting socket.

[Explanation of symbols]

 1 Backhoe 2 Hydraulic Drilling Machine 3 Sewer Main 4 Casing Pipe 5 Through Hole 6 Mounting Socket 7 Sewage Mounting Pipe 8 Earth Auger 9 Pipe Pressing Machine 10 Connecting Pipe 11 Locking Piece 12 Water Stop Ring 13 Cushion Ring 14 Cushion Ring Stop Part 15 (Water swelling) Seal material 16 Concrete core drill A Pavement B Bentonite material C Ground

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-1-193494 (JP, A) JP-A-61-228184 (JP, A) JP-B 3-9972 (JP, B2) JP-B 3- 10776 (JP, B2)

Claims (2)

[Claims] 1. A first step of excavating the ground by using an earth auger and press-fitting a casing pipe into a space created by the excavation by a pipe presser until it reaches the sewer main, and a wall surface of the sewer main is transparent. In the second step of making a hole, and with the tip of the sewage mounting pipe inserted in the mounting socket,
A third step of inserting a part of the mounting socket into the through hole; a fourth step of filling a filler between the outer periphery of the sewage mounting pipe and the inner periphery of the casing pipe; The mounting socket (6) comprises a hollow cylindrical main body (10).
A locking piece (11) is provided so as to project from the outer periphery of the main body (10b) below the locking piece, and a water-swelling sealing material (15) is fixed to the outer periphery of the main body (10b). In the body portion (10a) above the locking piece, the inner periphery thereof has an upper portion having a larger diameter than the outer periphery of the sewage mounting pipe, and the inner periphery has a lower portion having a smaller diameter than the outer periphery of the sewage mounting pipe
A stepped shoulder portion (10c) is formed, and an elastic cushion material (1) is formed on the shoulder portion.
3) is fixed, and the lowermost end surface of the sewage mounting pipe inserted into the upper portion is in contact with the shoulder portion via the cushion material, and the inner peripheral surface of the upper portion has elasticity. A ring-shaped water stop ring (12) having a property is provided around the outer peripheral surface of the sewage attachment pipe and the inner peripheral surface of the upper portion, and in the third step,
The sewage mounting pipe embedding method, wherein the locking piece is brought into contact with a peripheral portion of the through hole, and a main body portion below the locking piece is fitted and inserted into the through hole. 2. The sewage installation pipe (7) is used with the tip part inserted, and its own tip part is inserted into a through hole (5) newly formed in the existing sewer main (3). A mounting socket (6) for connecting the sewage mounting pipe to the sewage main pipe in a buried state by inserting the mounting socket, wherein the mounting socket has a flange shape on an outer periphery of a hollow cylindrical main body (10). A locking piece (11) is provided in a protruding manner, and a water-swelling sealing material (15) is fixed to the outer periphery of the main body (10b) below the locking piece. In the body portion (10a) above the one piece, the inner circumference thereof is an upper portion having a diameter larger than the outer circumference of the sewage mounting pipe, and the inner circumference thereof is a lower portion having a diameter smaller than the outer circumference of the sewage mounting pipe,
A stepped shoulder portion (10c) is formed, and an elastic cushion material (1) is formed on the shoulder portion.
3) is fixed, and an annular water stop ring (12) having elasticity is provided around the inner peripheral surface of the upper portion to form an inner circumference smaller than the outer diameter of the sewage attachment pipe. Mounting socket characterized by having.