JPH0868298A - Fixing method of driving pipe in shaft entrance and fixing device - Google Patents

Abstract

PURPOSE: To enable the connection between a preceding driving pipe and a following driving pipe. CONSTITUTION: A cylindrical casing 1 is buried in the vertical direction in the ground, the inside thereof is excavated to use it as a shaft, a space is formed around the end of a driving pipe 4, at the same time, a cylindrical cut-off device 3 mounting a packing for closing the circumference of the driving pipe to the inside thereof is installed in a driving work hole 2 provided to a side wall of the casing 1, and in the hole used as a shaft entrance in a driving method, a fixing device 20 expanding in the direction of the radius of the driving pipe is inserted in a space between the circumferential wall of the utmost driving pipe 4 and the interior circumferential wall of the cutoff device 3. The fixing device 20 is widened in the rear side from a joint section 6 of the driving pipe 4, and it is adhered to the circumferential wall of the driving pipe 4 and interior circumferential wall of the cut-off device 3. By the constitution, the driving pipe is fixed, and it is unmovable in the case of the connection of the joint section, so that the connection with a following driving pipe is surely made.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a propulsion system in which a casing is vertically buried in the ground to form a starting shaft, and a propulsion pipe such as a fume pipe is laid in the ground through a hole for propulsion work provided on the side wall of the shaft. In the construction method, the present invention relates to a method for fixing a propulsion pipe to a wellhead and a fixing tool therefor.

[0002]

2. Description of the Related Art A propulsion method in which a propulsion pipe is laid in the ground from a propulsion work hole provided on the side wall of a casing is a space provided around the end of the propulsion pipe in a propulsion work hole provided on the side wall of a vertical shaft casing. It is known that a cylindrical water stop (sometimes referred to as a space holding case) with a packing that closes the outer circumference of the propulsion pipe is installed inside the The present applicant also applied for Japanese Patent Application No. 6-142253.

The above water stop device is, for example, as shown in FIG.
A cylindrical body 3 having a rear end attached to the propulsion work hole 2 of the casing 1 and extending toward the propulsion direction has a diameter slightly larger than the outer diameter of the propulsion pipe 4, and the rear end of the propulsion pipe 4 is the inner surface of the casing 1. Even when the propulsion pipe 4 is press-fitted to be flush with or deeper than that, a predetermined space is defined around the rear end portion of the propulsion pipe 4 and the propulsion pipe is provided by the packing 5 provided inside. Four
It is for watertightly closing the surrounding area.

More specifically, the reason for mounting such a water stop in the propulsion method will be described. If the rear end of the propulsion pipe after the completion of burial protrudes into the casing as much as possible, another direction in the same casing will occur. When a new propulsion pipe is newly embedded in the pipe, the protruding part hinders the installation of the propulsion device and the setting of the propulsion pipe.On the other hand, the rear end of the propulsion pipe after completion of the embedding without attaching the water stop is the inner surface of the casing. This is because if the press-fitting is made to be flush with each other, the joint portion at the rear end of the propulsion pipe will be buried in the earth and sand, and it will not be possible to connect this to another pipe that opens into the casing.

Further, even when the propulsion pipes are successively connected to each other during the burial work, if the rear end of the front propulsion pipe projects into the casing, the space for setting the next propulsion pipe is reduced accordingly. If the rear end of the front propulsion pipe is pressed into the casing so that the rear end of the front propulsion pipe is flush with the inner surface of the casing without installing the water stop, the joint at the rear end will be It is because it will be buried in, it will not be possible to connect with the next propulsion pipe. In any case, the above water stop is used for executing the propulsion method in a casing having only a narrow space, or for enabling piping after burial.

[0006]

When continuing the propulsion pipe 4, the succeeding propulsion pipe 4b is set on the propulsion device, and is pressed with a predetermined pressing force toward the preceding propulsion pipe 4a. The joint portion 6a provided at the front end of the subsequent propulsion pipe 4b is connected to the joint portion 6a provided at the rear end (see FIG. 6).
(See (a)). 7 is a collar, 8 is a packing, and 9 is a buffer layer. Then, if the preceding propulsion pipe 4a does not move due to the pressing force at this time, both joints can be completely connected, but when the ground is loose, both joints are not completely connected and the preceding propulsion is performed. It can happen that the tube 4a is easily pushed inwards. Moreover, there is also a problem that the joint part is almost inside the water stop and it is not possible to see from the outside whether or not it is completely connected, so even if both joint parts were pushed in after they were completely connected, It is difficult to know for sure.

Further, as shown in FIG. 6 (b), a joint portion 10a provided at the rear end of the preceding propulsion pipe 4a and a joint portion 10b provided at the front end of the subsequent propulsion pipe 4b are screwed together. In the case of being composed of male and female screws, both joints are connected by rotating while pushing the subsequent propulsion pipe 4b.
11 is a packing and 12 is a buffer layer. Then, if the preceding propulsion pipe 4a does not move at this time, both joints can be completely connected, but when the ground is loose, the preceding propulsion pipe 4a remains unconnected without both joints being completely connected. It can happen that you turn around. In this case, too,
Even if both joints are completely connected and then the propulsion pipe 4a starts co-rotating, it is difficult to know for sure.

By the way, the hole 2 for propulsion work of the casing 1
In the case of the conventional construction method in which the water stop 3 is not attached to the
Since the rear end of the leading propulsion pipe 4a projects considerably into the casing 1 as shown in FIG.
Between the outer periphery of a and the hole 2 for propulsion work, for example, a wooden wedge 1
By driving 3 and fixing the leading propulsion pipe 4a to the propulsion work hole 2, the joint portion at the rear end of the leading propulsion pipe 4a and the joint portion at the tip of the succeeding propulsion pipe 4b are reliably connected. It was possible and the confirmation was easy. However, when the water stop 3 is attached to the propulsion work hole 2 as described above, if the wedge 13 in the conventional construction method is driven between the outer periphery of the preceding propulsion pipe 4a and the inner wall of the water stop 3, for example, A part of the joint 6a at the rear end of the propulsion pipe 4a is blocked by the wedge 13 and the connection cannot be established.

The present invention has been made to solve the above problems when a water stop is attached to a hole for propulsion work, and it is possible to reliably connect a preceding propulsion pipe and a succeeding propulsion pipe. The purpose is to do.

[0010]

The present invention relates to a method for fixing a propulsion pipe at the mouth of a shaft, in which a cylindrical casing is buried vertically in the ground and the inside is excavated to form a shaft, which is provided on the side wall of the casing. In the hole for propulsion work, install a cylindrical water stop with a packing that forms a space around the end of the propulsion pipe and closes the outer circumference of the propulsion pipe inside.
In this one that is used as a wellhead in a propulsion method, a fixing tool that expands and contracts along the radial direction of the propulsion pipe is inserted into the space between the outer peripheral wall of the propulsion pipe and the inner peripheral wall of the water stop, and the joint portion of the propulsion pipe is inserted. It is characterized in that the fixing tool is extended on the further back side and is brought into close contact with the outer peripheral wall of the propulsion pipe and the inner peripheral wall of the water stop. It is advisable to insert a plurality of the fixing tools at equal intervals in the space between the outer peripheral wall of the propulsion pipe and the inner peripheral wall of the water stop, for example, two at 180 ° apart.

As the fixing tool, for example, a padding member having an outer surface curved inward in an arc shape following the outer peripheral wall shape of the propulsion pipe, and an outer shape curved in an arc shape following the inner peripheral wall shape of the water stop. A padding member having an outer surface is provided, the padding members are arranged such that the outer surfaces face in mutually opposite directions, and one or both of the padding members are perpendicular to the outer surface by a wedge driven between the padding members. An example is one that is movable along the surface in the direction toward the outer surface.

[0012]

EXAMPLES Examples of the present invention will be described below with reference to FIGS. First, a fixing tool 20 shown in FIG. 3 has a first contact member 21 having an outer surface curved inward in an arc shape following the outer peripheral wall shape of a propulsion pipe, and an outer side in an arc shape following the inner peripheral wall shape of a water stop. Second padding member 2 having a curved outer surface
2 and a wedge member 2 having outer surfaces that slide along the slanted inner surfaces of the first contact member 21 and the second contact member 22.
3, a bolt 25 inserted into a hole 24 penetrating the center of the wedge member 23, and a nut 26 screwed into the bolt 25.
And the head of the bolt 25 and the first and second contact members 21,
2 and a washer 28 interposed between the nut 26 and the wedge member 23, and the nut 26 is rotated in the tightening direction to move the wedge member 23 to the position shown in FIG.
In (b), it is pushed downward, and its action causes the first and second contact members 21, 22 to move in the opposite direction along the washer 27 and spread.

When fixing the propulsion pipe 4, as shown in FIGS.
As shown in FIG. 2, the fixing member 20 is vertically symmetrical with respect to the space between the outer peripheral wall of the propulsion pipe 4 and the inner peripheral wall of the water stop 3, and the first contact member 21 faces the propulsion pipe 4 side and the second contact member 22. Is a water stop 3
Side, and the nut 26 is inserted so as to face the inside of the casing 1, and the nut 26 is rotated in the tightening direction on the inner side of the joint portion 6 to move the first and second contact members 21, 22.
Are expanded along the radial direction of the propulsion pipe 4, and the first contact member 2
1 to the outer surface of the propulsion pipe 4, and the second contact member 22 to the water stopper 3
Firmly contact the inner surfaces of the water pipes and connect the propulsion pipes 4 to the water stopper 3
Fixed to.

FIG. 4 shows a fixing member 30 having a structure similar to that of the fixing member 20 and having the same function.
In the fixing member 20, the first contact member 21 and the second contact member 2
The inner surface of 2 has a curved curved surface, and the outer surface of the wedge member 23 also has a curved surface following the curved surface, but in the fixing member 30, the inner surfaces of the first contact member 31 and the second contact member 32 are simply inclined. Since it is a flat surface and the outer surface of the wedge member 33 is also a flat surface following the flat surface, it is easy to manufacture and advantageous in cost.

In the above embodiment, the propulsion tube is fixed by moving both the first and second contact members of the fixing member, but the same effect can be obtained by moving only one of them. . Also, by expanding and contracting along the radial direction of the propulsion pipe in the space between the outer peripheral wall of the propulsion pipe and the inner peripheral wall of the water stop, the propulsion pipe can be secured by closely contacting the outer peripheral wall of the propulsion pipe and the inner peripheral wall of the water stop. Needless to say, the present invention is not limited to the fixing member shown in the above-mentioned embodiment, as long as it can be fixed to the water stop.

[0016]

As described above, according to the present invention, the propulsion pipe can be fixed to the water stop and held so as not to move. Therefore, the joint portions of the preceding propulsion pipe and the succeeding propulsion pipe are reliably connected. There is no need to visually check whether or not the connection has been made securely, and to confirm by any other method. In addition, by fixing the buried pipe, it is possible to prevent the situation where the buried propulsion pipe is pushed out to the inside of the casing due to earth pressure even when, for example, the work for burying the propulsion pipe is temporarily interrupted. You can also

[Brief description of drawings]

FIG. 1 is a cross-sectional view of the vicinity of a water stop in which a fixing member of an embodiment is inserted.

FIG. 2 is a view as viewed in the direction of arrows AA in FIG. 1;

FIG. 3 is a plan view (a), a sectional view (b) taken along the line BB in FIG. 3, and a bottom view (c) of the fixture of the embodiment.

FIG. 4 is a plan view (a) of the other embodiment of the fixture, the same CC.
It is the arrow sectional view (b) and a bottom view (c).

FIG. 5 is a cross-sectional view in the vicinity of a water stop in the propulsion method.

FIG. 6 is a sectional view illustrating a joint structure of a propulsion pipe.

FIG. 7 is a cross-sectional view (a) and a DD view thereof for explaining a method of fixing a propulsion pipe in a conventional method that does not use a water stop.

[Explanation of symbols]

 1 Casing 2 Hole for propulsion work 3 Water stopper 4, 4a, 4b Propulsion pipe 20, 30 Fixing member

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Miki Inaoka 10 Mole Industry Co., Ltd. 55 55 Izumida, Okayama City, Okayama Prefecture

Claims (3)

[Claims] 1. A cylindrical casing is vertically buried in the ground and the inside is excavated to form a vertical shaft, and a space is formed around an end of a propulsion pipe in a propulsion work hole provided in a side wall of the casing. A cylindrical water stop with packing that closes the outer circumference of the propulsion pipe was installed inside, and this was used as a wellhead in the propulsion method, and between the outer peripheral wall of the propulsion pipe and the inner peripheral wall of the water stop. Is inserted into the space of the propulsion pipe, the fixation device is extended on the inner side of the joint portion of the propulsion pipe, and the extension device is closely attached to the outer peripheral wall of the propulsion pipe and the inner peripheral wall of the water stop. Fixing method of propulsion pipe at shaft entrance. 2. The propulsion pipe in the shaft well shaft according to claim 1, wherein a plurality of the fixing tools are inserted into the space between the outer peripheral wall of the propulsion pipe and the inner peripheral wall of the water stop at equal intervals. Fixing method. 3. A patch member having an outer surface curved inward in an arc shape following the shape of the outer peripheral wall of the propulsion pipe, and a patch member having an outer surface curved in an arc shape following the shape of the inner peripheral wall of the water stoppage. The two padding members are arranged so that the outer surfaces thereof face in opposite directions, and one or both of the padding members are arranged along the plane perpendicular to the outer surface by a wedge driven between the two padding members. A fixture for fixing a propulsion pipe in a shaft well, which is movable in the direction of the shaft.