JPH07166796A - Pipe for jacking method - Google Patents

Abstract

PURPOSE:To push a pipe for a jacking method directly into soil without damaging a coat formed on a steel pipe. CONSTITUTION:A pipe 1 for a jacking method is so constructed that a resin concrete layer 3 is formed on the outer peripheral surface of a steel pipe 4 to which a coat 5 is applied. A supply pipe 6 is embedded in the resin concrete layer 3, thereby force-feeding a back-filling material 7. The coat 5 formed for preventing corrosion of the steel pipe 4 is protected by the resin concrete layer 3, so that the pipe 1 for a jacking method 1 can be pushed directly into soil without damaging the coat 5. Accordingly, the term of works can be shortened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe for a propulsion method which is preferably used for transporting a fluid such as gas.

[0002]

2. Description of the Related Art Conventionally, a propulsion method has been used to bury a fluid transportation tube such as a gas tube in soil by a non-excavation method.

Steel pipes are often used for so-called pressure pipes for transporting fluids such as gas from the viewpoint of importance of hermeticity and pressure resistance. A coating is provided on the outer peripheral surface of the steel pipe in order to prevent corrosion caused by moisture in the soil.

[0004] A fume having a diameter larger than that of a steel pipe is formed in the excavation hole by forming the excavation hole for propelling the fume pipe by horizontally starting the excavator from the propulsion device in the starting shaft formed in the ground. Propel the tube. A plurality of injection holes are formed in this fume tube, and after the completion of propulsion, a backfill material is injected from this injection hole by an operator who has entered the fume tube. The gap between the drilled hole and the Hume pipe is backfilled, and then the steel pipe is inserted into the Hume pipe.

[0005]

In the prior art as described above, the Hume pipe must be propelled into the ground and then the steel pipe must be inserted into the Hume pipe, which requires twice the work and prolongs the construction period. . Further, since the fume pipe is buried, a drill hole having an outer diameter considerably larger than the outer diameter of the steel pipe is formed, resulting in an increase in construction cost.
However, if the steel pipe is directly propelled, the coating on the surface of the steel pipe may be damaged, and the anticorrosion performance of the steel pipe cannot be guaranteed.

The backfilling work in the conventional propulsion method is performed by an operator who has entered the fume tube by injecting the backfilling material through the injection hole. When directly propelling a steel pipe for pressure piping, since the airtightness and pressure resistance are important, the injection hole cannot be formed. Further, the diameter of the steel pipe is small, for example, 600 mm, and it is not preferable that a person works in the steel pipe in consideration of safety.

An object of the present invention is to provide a pipe for a propulsion method which can shorten the construction period and the construction cost.

[0008]

DISCLOSURE OF THE INVENTION The present invention relates to a steel pipe coated with a coating, a resin concrete layer formed on the coating, and a pipe for supplying a backfill material embedded in the resin concrete layer. It is a pipe for propulsion method characterized by including and.

The backfill material supply pipe of the present invention comprises:
A nozzle that is opened by the pressure of the backfill material is provided,
The pressure is adjustable.

[0010]

According to the present invention, the pipe for the propulsion method is constructed by forming the resin concrete layer on the coating covering the steel pipe. That is, since the coating is protected by the resin concrete layer, the propulsion method pipe can be directly propelled into the soil without damaging the coating. Therefore, the construction can be completed in only one process, and the construction period and the construction cost can be reduced.

The resin concrete layer is formed by embedding a backfill material supply pipe therein. It is not necessary to form a through hole for backfilling material injection into the propulsion method tube itself, and it is not necessary for people to enter the propulsion method tube to inject the backfilling material, and the backfilling material can be easily supplied. it can.

Further, preferably, a nozzle is formed in the backfill material supply pipe, and the nozzle is opened by the pressure of the backfill material, and the opening pressure is adjustable. For example,
When the backfill material is pumped into the supply pipe with a pump,
The opening pressure of the nozzle can be set lower as the distance from the starting point of the backfill material is increased. This will start the supply of backfill material from the tip of the supply tube,
The nozzle opening point can be gradually brought closer to the supply starting point.

[0013]

1 is a sectional view in the axial direction of a propulsion method pipe 1 according to an embodiment of the present invention, and FIG. 2 is a sectional view of the propulsion method pipe 1 in the direction perpendicular to the axis. The propulsion method pipe 1 is configured by forming a resin concrete layer 3 on an outer peripheral surface of a main pipe 2. The main pipe 2 is coated on the outer peripheral surface of the steel pipe 4 which is a gas pipe.
Is applied to prevent corrosion of the steel pipe 4 due to moisture in the soil. A supply pipe 6 is embedded in the resin concrete layer 3 made of unsaturated polyester resin, and the propulsion method pipe 1 is arranged so that the supply pipe 6 is at the uppermost position. After the completion of the propulsion, the backfill material 7 such as air mortar is supplied to the supply pipe 6,
Opening 8 formed through the resin concrete layer 3
The back-filling material 7 is jetted from the.

FIG. 3 is an enlarged sectional view showing the vicinity of the opening 8. The opening 8 is closed by inserting a plug 9 made of a hard resin material. As shown in FIG. 4, the plug 9 has a cylindrical shape with a substantially T-shaped cross section in the axial direction, and a cylindrical recess 10 is formed in the center thereof. The recess 10 has a pin 11 made of a cylindrical metal.
Is hammered in and inserted.

Several types of pins 11 having different diameters are prepared. In this embodiment, if the diameter of the pin 11 is d and the diameter of the recess 10 is D, d1 = D and d2 = D.
+0.3 mm, d3 = D + 0.6 mm, d4 = D + 0.
9 mm, d5 = D + 1.2 mm, d6 = D + 1.5 m
m, d7 = D + 1.8 mm, and the above seven kinds of pins 11 are used. Of these, a pin 11 having a diameter that allows the opening pressure of the opening 8 to have a desired value is appropriately selected and inserted into the recess 10.

The propulsion method pipe 1 thus constructed is
After excavating the starting shaft in the soil, it is propelled into the ground soil while forming a horizontal excavation hole using an excavator. For example, when the propulsion method pipe 1 is propelled into the soil to some extent, the connection work with the next propulsion method pipe 1a is performed. In the vicinity of the ends of the propulsion method pipes 1 and 1a for connection, the resin concrete layers 3 and 3a and the coating materials 5 and 5a are not formed, and the steel pipes 4 and 4a are exposed. At this time, the tips of the supply pipes 6 and 6a also project from the ends of the resin concrete layers 3 and 3a.

FIG. 5 is a side view showing the work of connecting the propulsion method pipes 1 and 1a. As shown in FIG. 5 (1),
Connection between the propulsion method pipes 1 and 1a is performed by welding work such as arc welding. As shown in FIG. 5 (2), the welded portion 12 between the propulsion method pipes 1 and 1a is covered with a shrink tube 13 made of heat-shrinkable silicon rubber to form a so-called on-site coating 14. The supply pipes 6 and 6a which are projected from the ends of the resin concrete layers 3 and 3a are connected by a flexible rubber hose 15 as shown in FIG. 5 (3). Then, as shown in FIG. 5 (4), the connecting member 16 is covered to cover the rubber hose 15 and its connecting portion.

The connecting member 16 is, as shown in FIG.
Consisting of a pair of half-divided connecting members 16a, 16b,
Each is covered over the propulsion method pipes 1 and 1a.
The thickness of the connecting members 16a and 16b is equal to the thickness of the resin concrete layer 3, and the width thereof is equal to the distance between the resin concrete layers 3 and 3a. Connection members 16a, 16
concave grooves 17a and 17b are formed in each of b,
The recesses 17a and 17b protect the connection points between the supply pipes 6 and 6a and the rubber hose 15. Connection member 16
Since a and 16b are made of unsaturated polyester resin,
It can be easily joined.

In this way, the propulsion method pipes 1 are connected one after another and propelled into the soil. Since the excavation hole is formed larger than the propulsion method pipe 1, after the propulsion method pipe 1 is propelled, a gap is formed between the excavation hole and the propulsion method pipe 1. The principle of filling the backfill material into this gap is shown in FIG. When the backfilling material 7 stored in the tank 19 of the pressure feeding device 18 is pressure fed into the supply pipe 6, the pressure in the supply pipe 6 is as shown in FIG.
As shown in (1), the pressure is maximum at the position closest to the pressure feeding device 18, and becomes lower as the distance from the pressure feeding device 18 increases. The opening pressure of each opening 8 is set corresponding to this pressure distribution chart by selecting the diameter d of the pin 11.

The openings 8 formed in the supply pipe 6 are sequentially denoted by subscripts a to g in the direction away from the pumping device 18 and are shown as 8a, 8b, ..., 8g, and the openings 8a, 8b ,. The corresponding plug 9 and pin 11 are respectively connected to 9a, 9b, ..., 9
g; 11a, 11b, ..., 11g. At this time, the diameter of the pin 11a is d7, the diameter of the pin 11b is d6,
The diameter of the pin 11c is d5, and the diameter of the pin 11d is d4.
, The diameter of the pin 11e is d3, and the diameter of the pin 11f is d.
2 and the diameter of the pin 11g is selected as d1. d1 <
Since d2 <... <d7, the opening pressure becomes maximum at the opening 8a and minimum at the opening 8g. That is, the plugs 9 inserted into the respective openings drop off at low pressure at the position most distant from the pumping device 18, and drop off at high pressure at the position closest to the pumping device 18.

Therefore, the back-filling material 7 pressure-fed to the supply pipe 6 reaches the tip of the supply pipe 6 without fail, and the opening 8 is formed.
Are sequentially opened from the opening 8g most distant from the pressure feeding device 18 to the opening 8a closest to the pressure feeding device 18. Therefore, it is possible to reliably backfill the tip of the propulsion method pipe 1.

As described above, according to this embodiment, the coating device 5
Since the resin concrete layer 3 is formed on the outer peripheral surface of
The propulsion method pipe 1 can be directly propelled into the soil, and the construction can be simplified. Further, since the resin concrete layer 3 is formed with the supply pipe 3 provided inside thereof, a through hole for injecting the backfilling material 7 which becomes a factor of impairing pressure resistance and airtightness of the steel pipe 4 is formed in the steel pipe 4. It is possible to carry out backfilling without doing this, and since it is not necessary for an operator to enter inside the steel pipe 4 to carry out backfilling work, it is possible to ensure the safety of construction.

Although the gas pipe has been described in this embodiment, the propulsion method pipe 1 of this embodiment can be applied to high pressure pipes such as a water pipe. Also, if the outer diameter of the propulsion method pipe 1 is made to coincide with the outer diameter of the fume pipe used in the sewer construction, the excavator or the like used in the sewer construction can be diverted.

[0024]

As described above, according to the present invention, since the coating covering applied to the steel pipe is protected by the resin concrete layer, the pipe for propulsion method can be directly propelled into the soil,
This eliminates the need for double construction work, shortens the construction period, and reduces construction costs. Further, since the resin concrete layer is formed to include the backfill material supply pipe, it is easy to supply the backfill material after propelling the pipe for the propulsion method.

Further preferably, the nozzle formed in the backfill material supply pipe is opened by the pressure of the backfill material, and the opening pressure is adjustable. For example, if the opening pressure of the nozzle near the supply start point of the backfill material is set high and the opening pressure of the nozzle is set low as it separates from the supply start point, even the tip of the backfill material supply pipe is reached. Backfill material can be supplied.

[Brief description of drawings]

FIG. 1 is an axial sectional view of a propulsion method pipe 1 according to an embodiment of the present invention.

FIG. 2 is a sectional view of the propulsion method pipe 1 in a direction perpendicular to the axis.

FIG. 3 is a cross-sectional view illustrating the vicinity of an opening 8 in an enlarged manner.

FIG. 4 is a sectional view of the plug 9 in the axial direction.

FIG. 5 is a side view showing a connecting work between the propulsion method pipes 1 and 1a.

6 is a perspective view of a connecting member 16. FIG.

FIG. 7 is a diagram showing the principle of filling the backfill material 7.

[Explanation of symbols]

 1,1a Pipe for propulsion method 2 Main pipe 3,3a Resin concrete layer 4,4a Steel pipe 5,5a Paint coating 6,6a Supply pipe 7 Backfill material 8 Opening 9 Plug 10 Recess 11 Pin 16 Connection member 17 Recess Groove 18 pumping device

Claims (2)

[Claims] 1. A steel pipe coated with a coating, a resin concrete layer formed on the coating, and a backfill material supply pipe embedded in the resin concrete layer. Tube for propulsion method. 2. The backfill material supply pipe is provided with a nozzle that is opened by the pressure of the backfill material,
The pipe for propulsion method according to claim 1, wherein the pressure is adjustable.