JP2000028034A - Blocking method of column pipe for high hydraulic pressure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple method of effectively and surely blocking a column pipe for high hydraulic pressure. SOLUTION: This method is for blocking and removing a column pipe 1 used for lowering a ground water level to effectively dig the underground, after the digging is completed. This blocking method of column pipe for high hydraulic pressure comprises the steps of: installing a mortar grouting pipe 2 and a bleeder pipe 3 near the column pipe 1 at a time of installing the column pipe 1 for lowering the ground water level; closing a column pipe sluice valve 4; removing column pipe equipment A other than the column pipe 1 and the column pipe sluice valve 4 after checking hydraulic pressure of the column pipe 1 at the time of the closing; grouting mortar under pressure set to be not lower than the hydraulic pressure to conduct bleeding of air; and stopping the grouting of the mortar when the mortar bleed out from the bleeding pipe 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of closing a pumping pipe which is no longer required after use.

[0002]

2. Description of the Related Art In order to improve the efficiency of underground excavation work, when removing pumping pipes for lowering the underground water level after completion of underground excavation work, a valve is attached to the pumping pipe and mortar is injected into the pumping pipe. The pump was closed.

[0003] However, according to this method, the mortar for closing is separated, so that effective closing cannot be performed. High water pressure eruption accidents occur due to groundwater. The enormous expense spent for the blockage is wasted. There was a problem in such points.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and it is possible to efficiently and reliably close a high-pressure pumping pipe by a simple method. The aim is to provide a method.

[0005]

[MEANS FOR SOLVING THE PROBLEMS] This is a method of removing a clogging of a pumping pipe for lowering the underground water level to improve the efficiency of underground excavation work after completion of the underground excavation work. When installing the pumping pipe, install a mortar injection pipe and air bleeding pipe near the pumping pipe, close the pumping sluice valve, check the water pressure of the pumping pipe at the time of blockage, and check the water pressure other than the pumping pipe and pumping sluice valve. Removing the pumping equipment, injecting the mortar at an injection pressure set above the water pressure, bleeding the air, and stopping the mortar injection when the mortar is ejected from the air vent pipe, characterized by high water pressure. Pumping pipe closing method.

[0006]

Embodiments of the present invention will be described below with reference to the drawings.

<A> Overall Configuration FIG. 1 is a side sectional view showing a method of closing a high water pressure pumping pipe according to the present invention. This is a method for removing the clogging of the pumping pipe 1 for lowering the underground water level performed to measure the efficiency of underground excavation work, and removing the blockage after the completion of the underground excavation work. The mortar injection pipe 2 and the air release pipe 3 are installed near the pumping pipe 1, the pumping sluice valve 4 is closed, and after confirming the water pressure of the pumping pipe 1 at the time of closing, other than the pumping pipe 1 and the pumping sluice valve 4. High-pressure pumping pipe closing method, in which mortar is injected at an injection pressure set to be equal to or higher than the above water pressure, air is evacuated, and mortar injection is stopped when the mortar is ejected from the air bleeding pipe 3. It is.

<B> Pumping Equipment Pumping equipment A in FIG. 1 is a layout diagram of pumping equipment conventionally used. A pumping sluice valve 4 is attached to the top of a pumping pipe 1 installed deep underground for pumping groundwater, and a pumping facility A is installed via the pumping sluice valve 4. The pumping facility A is composed of, for example, a drain pipe 5, a drain sluice valve 6, a pressure gauge 7, a valve 8 attached to another drain pipe 5, and the like. In this embodiment, the pumping equipment A is installed in advance so as to be located on the upper surface of the bottom slab 9. After the construction is completed, the pumping sluice valve 4 is installed in advance so as to be accommodated within the thickness of the bottom slab 9. During the construction, the bottom slab 9 of the portion where the pumping sluice valve 4 is installed is installed. Has been unboxed. In the present embodiment, since the pumping equipment A is installed on the basement floor, the manhole 10 is installed above the ground, and an operation panel 11 for operating the pumping equipment A is installed.

<C> Blocking Facility When the pumping facility A is installed on the basement floor, a mortar injection pipe 2 and an air vent pipe 3 are installed near the pumping pipe 1. The mortar injection pipe 2 and the air release pipe 3 may be those conventionally used, and each upper end is covered by a blind flange 12.

[0010]

In the following, a method for closing a high-pressure water pump according to the present invention will be described.

<A> Removal of Pumping Facility The pump operation switch of the pumping facility A is turned off by the operation panel 11, the pumping sluice valve 4 is closed, and the operation of the pumping pipe 1 is stopped. When the pumping sluice valve 4 is closed, the water pressure of the pumping pipe 1 is checked. After the operation of the pump is stopped, the electric wiring facilities of the pump are removed, and the pumping facility A above the pumping sluice valve 4 is dismantled and removed.

<B> Blockage of Pumping Pipe A mortar injection plant facility and the like are assembled on the bottom slab 9. The mortar injection pipe 2, the blind flange 12 at the upper end of the air release pipe 3 are removed, a mortar injection valve is attached to the mortar injection pipe 2, and an air release valve is attached to the air release pipe 3. At the time of mortar injection, since the water pressure of the pumping pipe 1 has been confirmed in advance, the mortar is injected at an injection pressure set to be higher than the water pressure. For example, when the water pressure is 1.5 atm, the injection pressure is set at 2.0 to 3.0 atm.
The mortar injection amount is calculated and calculated beforehand. At the time of mortar injection work, pay attention to the change of the injection pressure and visually check the outflow amount of air and groundwater from the air release pipe 3, and when the mortar starts flowing out of the air release pipe 3, perform the mortar injection work. finish. After the injection operation is completed, all the valves are closed to cure the injected mortar.

<C> Injectable material With regard to the mortar used for closing the mortar, since the water pressure in the pumping pipe 1 is high and the water level is not in the still water level, the mortar may be separated in water. As the mortar used in the present embodiment, a mortar mixed with a water-immiscible concrete admixture is used. By using this mortar, the workability is good and the amount of breathing is small, so there is no possibility of cement flowing out due to material separation or the like, and there is no concern about water pollution. Also,
In terms of strength, it maintains the original strength of concrete, and since the material itself is alkaline, there is no fear of corrosion to metal steel and the like.

<D> Confirmation of Water Leakage and its Treatment After the mortar injection work is completed, it is checked whether there is any water leakage, water discharge, etc. from the injected pumping pipe 1. If there is no water leakage,
Remove the pumping sluice valve 4, injection valve, etc. to remove the blind flange 12
Attach. If there is water leakage or the like, a hole is made in the water leakage location using a drill or the like, an injection plug is attached, for example, a urethane foam-based material is injected, and the water stoppage injection is completed.

<E> Closure of cut-out portion of bottom slab After completion of blockage in pumping pipe 1, cut-out portion of bottom slab 9 and its lower portion (concrete casting portion 13 indicated by a dotted line) are closed.
A reinforcing bar is assembled in the cutout portion 13, and a non-shrink mortar or the like is cast and closed.

[0016]

Since the present invention has been described above,
The following effects can be obtained. <A> Since the injection is performed after the water pressure is controlled during the injection, the separation of the mortar can be suppressed. <Ii> Since the mortar uses a mortar mixed with a water-immiscible concrete admixture, the separation of the mortar can be suppressed and the mortar can be filled at a high density. <C> Since the groundwater does not erupt after the blockage of the pumping pipe is completed, the construction cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a method of closing a high pressure water pump according to the present invention.

Claims (1)

[Claims] Claims: 1. A pumping pipe for lowering the groundwater level, which is used to improve the efficiency of underground excavation work,
This is a method to remove blockage.When installing a pumping pipe for lowering the groundwater level, install a mortar injection pipe and air bleeding pipe near the pumping pipe, close the pumping sluice valve, and lift the pipe at the time of blockage. After confirming the water pressure, remove the pumping equipment other than the pumping pipe and the pumping sluice valve, inject mortar with the injection pressure set above the water pressure, and perform air bleeding.When the mortar gushes from the air bleeding pipe, A method of closing a high-pressure water pump, characterized by stopping injection.