JP2000352045A - Spring water drain pipe cutoff construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spring water drain pipe water cutoff construction method preventing a construction period from being prolonged and also preventing spring water from obstructing construction even if an existing spring water drain pipe is exposed when the construction is performed in a natural ground with much spring water. SOLUTION: This spring water drain pipe cutoff construction method, in which an existing spring water drain pipe 5 is cut off for excavating operation when an existing spring water drain pipe 5 is exposed into an excavating gallery, comprises the steps of preparing packer cloth bag 7 and a filling tube 6 with a diameter smaller than that of the existing spring water drain pipe 5, inserting the filling tube 6 from an opening end part 7a of the packer cloth bag 7 except for one end part 6a thereof, and squeezing the opening end part 7a of the packer cloth bag 7 at one end part 6a of the filling tube 6 to close the packer cloth bag 7, cutting the existing spring water drain pipe 5, inserting the packer cloth bag 7 and filling tube 6, filling a chemical M from one end part 6a of the filling tube 6 into the packer cloth bag 7 to expand the packer cloth bag 7, and sealing a cut part of the existing spring water drain pipe 5 by the expansion of the packer cloth bag 7 so as to cut off water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spring water drainage pipe for stopping drilling work by excavating the existing spring drainage pipe when the existing spring drainage pipe is exposed in an excavation pit in a mountain with a lot of spring water. Regarding the water works method.

[0002]

2. Description of the Related Art In a mountain with a lot of spring water, a ceramic spring water drainage pipe is laid in order to eliminate infiltration water underground, prevent landslides and stabilize a roadbed. Also, when installing a main pipe such as a sewer pipe, a spring drainage pipe is often laid around the installed sewer pipe or the like to stabilize the roadbed.

[0003] When a shaft excavation work is carried out in a ground with a lot of spring water, a spring drainage pipe laid in the construction area is exposed, which may hinder the work. In such a case, conventionally, a drilling operation is performed while pumping draining spring water generated by cutting the spring water drainage pipe (pump drainage method), or a temporary method of bypassing the construction area to the cut spring water drainage pipe. The excavation work was performed by installing a bypass drain pipe (temporary drain pipe bypass method).

[0004]

However, when the pump drainage method is used, even if the spring water is drained by the pump each time, the spring water flowing out from the spring drain pipe hinders the construction, and the excavation process becomes smooth. There was a problem that can not be.

[0005] In addition, if the temporary drainage pipe bypass method is used, the construction period is prolonged by the provision of temporary drainage bypass pipes,
There was a problem that the cost could not be reduced, and that a bypass pipe for temporary drainage hindered excavation work.

The present invention has been made in view of the above-mentioned problems, and when construction is carried out in a mountain with a lot of spring water, the construction period is not extended even if the existing spring drainage pipe is exposed, and the spring water drainage is not performed. It is an object of the present invention to provide a method for stopping spring water drainage pipes in which the pipes do not hinder construction.

[0007]

Means for Solving the Problems In order to solve the above-mentioned problems, the method for stopping water from a spring drainage pipe according to the present invention employs the following means.

[0008] That is, according to the method for stopping water of a spring drainage pipe according to the present invention, when the existing spring drainage pipe is exposed in a digging pit, the spring drainage pipe performs water drilling by stopping the existing spring drainage pipe. Preparing a packer cloth bag and an injection pipe having a smaller diameter than the existing spring drainage pipe, inserting the injection pipe except for one end from the open end of the packer cloth bag, and performing the injection. A step of squeezing the open end of the packer cloth bag at one end of the pipe, sealing the packer cloth bag, cutting the existing spring drainage pipe, and removing the existing spring drainage pipe except for one end of the injection pipe. A step of inserting the packer cloth bag and the injection pipe from the cutting section, a step of injecting a chemical solution into the packer cloth bag from one end of the injection pipe, and inflating the packer cloth bag; Cut section of spring drainage pipe It is sealed, characterized in that a procedure for stopping water.

[0009] According to this configuration, when the construction is carried out in a mountain with a lot of spring water, even if the existing spring drainage pipe is exposed, the existing spring drainage pipe is cut, and the packer cloth bag is inserted into the cut pipe. The spring drainage pipe cut by an easy procedure such as expanding and sealing by injecting a chemical solution can be reliably stopped. Therefore,
Cutting the spring drainage pipe does not hinder the excavation work because the spring water does not hinder the excavation work, so that the post-process can be performed smoothly, the period during which excavation is stopped can be shortened, and the cost can be substantially reduced.

The existing spring drainage pipe of the present invention can be exemplified by a configuration in which the existing spring drainage pipe is cut at the excavation cross-sectional position of the excavation pit. According to this example, the work space in the excavation pit is widened, and the existing spring drainage pipe does not hinder the construction.

If the existing spring drainage pipe of the present invention has a diameter of 150 mm or less, it is suitable for expanding and sealing the existing spring drainage pipe with a packer cloth bag to stop water.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a construction of a spring drainage pipe according to an embodiment of the present invention;

According to the method for stopping water from a spring drainage pipe according to this embodiment, in a sewerage work for suspending and protecting an existing drainage pipe of φ800 mm, a ceramic pipe (spring drainage pipe) of φ150 mm or less is provided below the existing drainage pipe. The method of stopping the spring drainage pipe when it goes out and hinders the shaft excavation work will be described.

In FIG. 1, a ground pile G is excavated in a shaft, and a retaining wall is formed by a liner plate 1 on an excavated cross section S. In this way, earth retaining excavation is performed up to the buried position of the existing sewer pipe 2.

Next, it is assumed that when the lower part of the existing sewer pipe 2 is dug through, a ceramic pipe (spring drainage pipe of φ150 mm or less) 5 is exposed below the existing sewer pipe 2. In this case, the spring drainage water stopping method of the present invention is performed on both the upstream side and the downstream side of the spring drainage pipe 5.

First, two sets of the injection pipe 6 and the packer cloth bag 7 shown in FIG. 2 are prepared for stopping water upstream and downstream of the spring drainage pipe 5. The injection pipe 6 is a PVC pipe VP (φ13 mm) having a diameter smaller than the diameter of the spring drainage pipe 5 and has a length of 5 m on one side.
(10 m for the two sets on the upstream and downstream sides).

The packer cloth sack 7 is a cloth sack whose length is slightly longer than 5 m, and two sheets are prepared for the upstream and downstream sides. Next, the opening end 7 of the packer cloth bag 7 is removed except for one end 6a of the injection tube 6.
The injection pipe 6 is inserted from a, and the open end 7a of the packer cloth bag 7 is squeezed with the wire 6 while the one end 6a of the injection pipe 6 is seen through the packer cloth bag 7, and is completely drawn and sealed.
This is performed for the two upstream and downstream sets.

An injection hose 9 is connected to one end 6a of the injection pipe 6 both upstream and downstream. The injection hose 9 is connected to a chemical injection plant (not shown), and injects the chemical M into the packer cloth bag 7 through the injection pipe 6. The chemical M is water glass / inorganic reactive material-based LW (sodium silicate).

Next, at the excavation section S, the exposed spring drainage pipe 5 is cut, and the packer cloth bag is cut from the cut end of the spring drainage pipe 5 toward the inside of the pipe from the other end 6b side of the injection pipe 6. 7 and the injection tube 6 are inserted. This is performed for the two upstream and downstream sets.

Then, the drug solution M is injected into the other end 6b of the injection pipe 6 through the injection hose 9, and the packer cloth bag 7 is inflated. Then, the expansion of the packer cloth bag 7 causes friction and expansion resistance between itself and the inside of the pipe, so that the cut inside of the spring drainage pipe 5 is sealed to prevent it from coming off and stop water. The water stop section L is 5 m on one side (10 m for two sets on the upstream and downstream sides). When the injected liquid M solidifies in the packer cloth bag 7, the injection hose 9 is removed from one end 6a of the injection pipe 6.

Next, the shaft excavation work is continued with the spring water drainage pipe 5 stopped, excavation is performed to the excavation bottom surface B, and the existing sewer pipe 2 is suspended and protected. That is, as shown in FIG. 1, a PC frame 3 on which an existing sewer pipe 2 is suspended is installed in an excavated shaft, and turnbuckles 4 and 4 are set on the upper portion of the PC frame 3. The existing sewer pipe 2 is suspended and protected using the turnbuckles 4 and 4.

When the suspension protection of the existing sewer pipe 2 is completed, the excavated shaft is buried. Note that the packer cloth bag 7 and the injection pipe 6 used for stopping water are left. According to this embodiment,
When the construction is carried out in a mountain with a lot of spring water, even if the existing spring drainage pipe 5 is exposed, the spring drainage pipe 5 is cut, and a packer cloth bag 7 is inserted into the pipe to expand and seal by injecting the chemical M. The cut-off spring drainage pipe 5 can be reliably stopped by a simple procedure. Therefore, since the spring water after cutting the spring drainage pipe 5 does not hinder the excavation work, the subsequent process can be performed smoothly, the period during which excavation is stopped can be reduced, and the cost can be substantially reduced.

In the case of the sewer pipe hanging protection work of this embodiment, it can be reduced by 7 days compared with the conventional pump drainage method,
% Cost reduction. In addition, compared to the conventional temporary drainage pipe bypass method, the time was reduced by 15 days, and the cost was reduced by 50%.

Although the present embodiment has been described with reference to the case of suspension protection work for an existing sewer pipe, the present invention is not limited to such sewer work, and the spring drainage pipe exposed in the excavation pit is stopped. Included for water works.

Further, in this embodiment, the chemical liquid M to be injected is described as LW (sodium silicate) of a water glass / inorganic reaction material, but the chemical liquid M is not limited to LW (sodium silicate). A chemical solution having a short gelation time may be used.

[0026]

As described above, according to the method for stopping water from a spring drainage pipe according to the present invention, when constructing a mountain in which there is a lot of spring water, the spring drainage pipe is cut even if the existing spring drainage pipe is exposed. The cut spring water drainage pipe can be reliably stopped by an easy procedure such as inserting a packer cloth bag into the pipe and inflating and sealing it by injecting a chemical solution. Therefore, since the spring water after cutting does not hinder the excavation work, the subsequent process can be performed smoothly, the period during which excavation is stopped can be shortened, and the cost can be substantially reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram in a case where a water stopping method for a spring drainage pipe according to an embodiment of the present invention is applied to suspension protection work of an existing sewer pipe.

FIG. 2 is an explanatory view of a packer cloth bag and an injection pipe used in a method for stopping water from a spring drainage pipe according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Liner plate 2 ... Existing sewer pipe 3 ... Body 4 ... Turnbuckle 5 ... Spring drainage pipe 6 ... Injection pipe 7 ... Packer cloth bag 8 ... Narrowing wire 9 ... Injection hose G ... ground mountain S ... Excavation section B ... Excavation Bottom L: Water stop section M: Chemical liquid

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Yoshinori Washizu 4-Terminal 2-35, Kudankita, Chiyoda-ku, Tokyo F-term (reference) 2D043 DA04

Claims (3)

[Claims] The present invention relates to a method for stopping water from an existing spring drainage pipe when the existing spring drainage pipe is exposed in a drilling pit, and performing drilling work. Prepare an injection pipe with a smaller diameter than the existing spring drainage pipe, insert the injection pipe except for one end from the open end of the packer cloth bag, and insert the open end of the packer cloth bag at one end of the injection pipe. Narrowing down, closing the packer cloth bag, cutting the existing spring drainage pipe, inserting the packer cloth bag and the injection pipe from the cut portion of the existing spring drainage pipe except for one end of the injection pipe. A step of injecting a chemical solution into the packer cloth bag from one end of the injection pipe to expand the packer cloth bag, and sealing the cut portion of the existing spring drainage pipe by the expansion of the packer cloth bag to stop water. And steps to perform Waterproofing construction method spring water drain pipe, characterized. 2. The method according to claim 1, wherein the existing spring drainage pipe is cut at the excavated cross section of the excavation pit. 3. The existing spring drainage pipe has a diameter of 150 m.
3. The method for stopping water from a spring drainage pipe according to claim 1 or 2, wherein the diameter is not more than m.