JPH07239056A - Working method for underground buried pipe - Google Patents

Abstract

PURPOSE:To economically perform the working for an underground buried pipe in a short term of work by inserting a pipe body for work into a wall-surface protecting pipe body to surround the work scheduled position for an underground buried pipe to form a work space isolated from the ground, and applying work to the underground buried pipe within the work space. CONSTITUTION:A wall-surface protecting pipe body 2 is inserted under pressure nearly vertical from the ground towards a scheduled underground buried pipe and the high- pressure water from a high-pressure water generating device on the ground is jetted out towards the surface of the ground from a jet nozzle 4 at the tip of a lance 3 inserted into the wall-surface protecting pipe body 2 to dig the surface of the ground and to form earth and sand into mud. The mud is sucked up to the ground through a mud suction pipe 5 and discharged so as to dig down. A pipe body 6 for work is inserted into a digging hole (a) and at the same time an annular seal member 8 is inserted along the inner wall of the wall-surface protecting pipe body 2, and then the tip of the pipe body 6 for work is brought into close contact with the surface of a buried pipe (b) through an annular seal member 7 into which water or air is injected to form a work space within the digging hole (a), so that immediately various work may be applied to the work scheduled position (c) of the buried pipe (b).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing an underground buried pipe, in which a branch or the like is provided or a damaged portion is repaired for an underground buried pipe for passing water supply, sewerage, gas pipes and telephone lines. The present invention relates to a method for performing work such as doing.

[0002]

2. Description of the Related Art Conventionally, when it is attempted to add work to pipes for water supply, sewerage, gas, etc., or underground pipes for passing telephone lines, etc., the ground around the planned work position is excavated from the ground and the earth and sand are excavated. It was usual to remove the ground and expose the underground pipe to a wide extent before proceeding with the work. However, this method is unavoidable when the position to be excavated cannot be accurately determined in advance, such as when repairing a damage that has occurred in an underground buried pipe, but when adding a branch pipe, etc. When it is decided, excavating the underground buried pipe so as to expose it widely not only increases the amount of work, but also lengthens the construction period, which is uneconomical and its impact on the surrounding area cannot be ignored.

[0003]

SUMMARY OF THE INVENTION Therefore, the present invention employs a construction method capable of minimizing the excavation range of the ground when the planned work position is determined in advance, and works on the underground buried pipe. The purpose of the present invention is to provide an economical underground burying pipe construction method with a short construction period by securing a working space of a sufficient size for adding the above.

[0004]

In order to achieve the above object, a method of working an underground buried pipe according to the present invention is to form an excavation hole from the ground toward a planned working position of the underground buried pipe, and A step of inserting a wall protection pipe into the hollow wall, a step of measuring the outer wall shape of the underground buried pipe portion exposed at the bottom of the excavation hole, and a hollow expandable at the tip of a shape complementary to the outer wall shape. And a step of preparing a work tube having a smaller diameter than the wall surface protection tube body, and inserting the work tube body into the wall surface protection tube body to enclose the planned working position of the underground buried pipe The method comprises the steps of forming a working space that is blocked from the above, and a step of working a buried underground pipe in the working space.

[0005]

According to the method of working an underground burial pipe of the present invention, the planned working position is exposed by forming the digging hole toward the underground burial pipe while inserting the wall protection pipe body of the digging hole from the ground, and then burial underground. Measuring the outer wall surface shape of the planned working position of the pipe, a working tubular body having a hollow annular seal member which is inflatable at the tip portion, in addition to the tip portion having a shape complementary to the outer wall surface shape, By inserting the annular sealing member into the wall surface protection pipe and bringing the annular seal member into close contact with the outer wall surface of the underground buried pipe, a working space surrounded by the ground is formed around the planned work position. According to the present invention, it is easy to secure a space large enough for work even if the amount of earth and sand to be excavated is small, and furthermore, even if the groundwater level is high, water can be stopped easily.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method of working an underground buried pipe according to the present invention will be described with reference to the drawings. FIG. 1 shows a process of forming a drill hole from the ground toward a planned working position of an underground buried pipe. First, a planned working position of a buried pipe b buried in the ground 1, for example, a branch pipe is branched. The wall surface protection tube body 2 is press-fitted substantially vertically from the ground toward the planned opening position for providing the opening.
If the tip of the wall surface protection tube 2 slightly enters the ground 1, high pressure water introduced by a high pressure hose or the like from a high pressure water generator separately prepared on the ground will be used for the wall surface protection tube 2
It is jetted toward the ground surface from a jet nozzle 4 provided at the tip of a lance 3 inserted inside the lance 3, and the ground surface is dug down and the digged earth and sand is turned into a mud. On the other hand, the generated mud is sucked up and discharged to the ground through the mud suction pipe 5 that is similarly inserted inside the wall surface protection pipe body 2 to dig down the ground surface. Next, the wall surface protection pipe body 2 is further press-fitted into the ground 1, and the excavation of the ground is advanced by repeating the same operation as described above to form the excavation hole a surrounded by the wall surface protection pipe body 2.

In this way, if the depth of the excavation hole a still does not reach the planned level even if the entire wall surface protection tube 2 is press-fitted into the ground 1, a separately prepared unit tube should be connected to the rear end thereof. The wall protection pipe 2 is extended to continue excavation, or the wall protection pipe 2'having a smaller diameter than the wall protection pipe 2 is press-fitted into the ground 1 from the bottom surface of the excavation hole a, and Similarly, continue excavation. If the surface of the buried pipe b is exposed at the bottom surface of the excavation hole a in this way, the shape of the exposed portion is measured and compared with the shape of the planned working position c of the buried pipe b, which is predicted in advance. After confirming that it is exposed, the three-dimensional shape of the surface of the buried pipe b exposed on the bottom surface of the excavation hole a is measured and recorded.

Next, based on the above-mentioned record, the shape of the tip portion 6a of the working pipe body 6 having a smaller diameter than the wall surface protection pipe body 2 and inserted into the wall surface protection pipe body 2 is determined. The shape of the tip portion 6a must be complementary to the three-dimensional shape of the surface of the buried pipe b exposed on the bottom surface of the drill hole a. The tip portion 6a may be one prepared separately from the working tube body 6 and appropriately selected and attached to the end portion of the working tube body 6, or the working tube body. The tip of 6 itself may be processed into a shape complementary to the three-dimensional shape of the surface of the buried pipe b.

A hollow annular seal member 7 that expands by injecting a fluid such as air or water is attached to the tip portion 6a thus prepared, and a work is performed inside the wall surface protection tube body 2. The surface of the buried pipe b and the tip of the working pipe body 6 can be brought into close contact with each other via the annular seal member 7 when the working pipe body 6 is inserted. Further, an annular seal member 8 for sealing between the outer surface of the work tube body 6 and the inner surface of the wall surface protection tube body 2 may be provided and placed on the outer surface of the work tube body 6. In this case, the annular seal member is provided. The structure of the member 8 may be the same as that of the annular seal member 7 described above.

The working pipe body 6 prepared as described above is inserted into the excavation hole a. At that time, the annular seal member 8 is also inserted along the inner wall of the wall surface protecting pipe body 2, and then the working pipe body. The tip of the body 6 is embedded in the buried pipe b via the annular seal member 7.
Of the work pipe body 6 and the wall surface protection pipe body 2 are also sealed by the annular seal member 8 to form a work space as shown in FIGS. 2 and 3 in the excavation hole a. To be done. Since this working space is protected from the surrounding ground, there is no fear of inflow of water, earth and sand, etc., and it is possible to immediately perform various works such as drilling at the planned work position c of the buried pipe b.

[0011]

According to the method for working an underground buried pipe of the present invention, it is possible to form a working space of a size necessary for working on the underground buried pipe by a simple procedure without digging up the ground widely. As a result, the construction period can be shortened easily and the work cost can be reduced.

[Brief description of drawings]

FIG. 1 is an explanatory view of a process of forming an excavation hole from the ground in the method for working an underground buried pipe of the present invention.

FIG. 2 is an explanatory view showing the structure of a working space formed in the method for working an underground buried pipe of the present invention.

FIG. 3 is a partial cross-sectional view of an essential part of FIG. 2 showing a structure of a working space formed in the method for working an underground buried pipe of the present invention.

[Explanation of symbols]

 1 Ground 2, 2'Wall surface protection pipe body 3 Lance 4 Jet nozzle 5 Mud suction pipe 6 Working pipe body 6a Tip part 7 Annular seal member 8 Annular seal member a Excavation hole b Buried pipe c Planned work position

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display area F16L 41/08

Claims (5)

[Claims] 1. A step of forming an excavation hole from the ground toward a planned working position of an underground excavation pipe and inserting a wall protection pipe into the excavation hole, and an underground embedding pipe portion exposed at the bottom of the excavation hole. The step of measuring the outer wall surface shape, and the step of preparing a working tube body having a hollow annular seal member at the tip of a shape complementary to the outer wall surface shape and having a diameter smaller than that of the wall surface protection tube body. And a step of inserting the working pipe body into the wall surface protecting pipe body to form a working space that surrounds the planned working position of the underground buried pipe and is shielded from the ground, and to the underground buried pipe in the working space. A method of working an underground buried pipe, including a step of performing work. 2. The excavation hole is formed by press-fitting the wall surface protection pipe body into the ground and performing high-pressure water injection on the ground surface exposed in the wall surface protection pipe body to suck up the generated soil-sand mixture liquid. Item 1. A method for manufacturing an underground buried pipe according to Item 1. 3. The method for working an underground buried pipe according to claim 1, wherein a wall surface protection pipe body assembled by connecting mutually removable unit pipe bodies is used. 4. The method for working an underground buried pipe according to claim 1, wherein a working pipe body assembled from a replaceable tip portion and a main body portion is used. 5. The method for working an underground buried pipe according to claim 1, wherein the outer surface of the working pipe body and the inner surface of the wall surface protection pipe are provided in close contact with each other via an annular seal member.