JP2002047630A - Water leakage preventive construction method of dam - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water leakage preventive construction method of a dam capable of effectively blocking up a crack caused in a bank body of a dam and capable of preventing a loss of water flowing out of the crack. SOLUTION: In this construction method for preventing water leakage caused from the crack caused in the bank body of the dam, a water leakage preventive material 6 by mixing a soft raw material 5 with a fluid medium 4 is pressed in the crack 2, the soft raw material 5 is entangled in the crack 2, and the water leakage is prevented by blocking up the crack 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dam leakage prevention method for preventing water leaking from a crack generated in a dam body.

[0002]

2. Description of the Related Art Dams are constructed using terrain to dam rivers for water use or power generation. Such dams are usually constructed of concrete structures to embank and block water. However, cracks occur in the embankment due to expansion and contraction of cement, which is a main component of the concrete structure, or due to aging.

[0003] A portion of the water dammed by the dam leaks from the cracks generated in such a bank, and the cracks gradually expand.

Conventionally, measures have been taken to fill such cracks in the dam body, such as by injecting cement milk or coagulant into the cracks.

[0005]

However, since the water pressure of the dammed water is applied to the dam body, a violent flow of water is generated in the crack. For this reason, the cement milk or the coagulant injected into the crack is flushed with water before it hardens in the crack, and it is impossible to close the crack. The amount of water flowing out of the cracks generated in the dam body is large due to the high water pressure, and the loss from the use of water resources is enormous. In particular, water resources flowing out of cracks in dams due to recent water shortages or increased power demand have been a major problem in industrial policy. The decrease in hydropower generation due to the outflow of water leads to an increase in thermal power generation using fossil fuels, and also causes global warming. In recent years, the increase in nuclear power generation, which has been pointed out in recent years, has led to the construction or expansion of nuclear power plants,
There are a number of serious issues, such as environmental issues and the problem of spent nuclear fuel disposal.

An object of the present invention is to solve the above problems and to provide a dam leakage prevention method capable of effectively closing a crack generated in a dam embankment and preventing loss of water flowing out of the crack. I do.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is a construction method for preventing water leakage caused by cracks generated in a dam embankment, wherein the water leakage is obtained by mixing a soft material into a fluid medium. An object of the present invention is to press an preventing material into the crack, entangle the soft material in the crack, close the crack, and prevent water leakage. Further, the present invention is a construction method for preventing water leakage resulting from a crack generated in a dam body of a dam. The method includes drilling a hole toward the inside of the crack portion, inserting a supply pipe into the hole, and performing the supply. Using a pump pressure to the pipe, pump the water leakage prevention material mixed with the soft material into the fluid medium, press-fit the water leakage prevention material into the crack, entangle the soft material in the crack and close the crack, The purpose is to prevent water leakage.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. In FIG. 1, a dam body 1 of a dam is constructed of concrete containing cement as a main component. In the dam body 1 of this dam, cracks 2 are generated due to expansion and contraction of cement or aging of the cement. From this crack 2, the water 3 dammed by the dam flows out by water pressure. Therefore,
A water leakage prevention material 6 mixed with a soft material 5 is press-fitted into the fluid medium 4 into the crack 2.

As the fluid medium 4, cement milk,
Alternatively, a material to which various coagulants containing cement as a main component are added, and other various materials having a viscosity can be used. As the soft material 5, a flexible material such as a fiber material, a synthetic resin material, and natural rubber can be used.

As the fiber material, a piece of cloth, a piece of cloth, a piece of paper, a piece of paper, a leather material, or the like can be used. As the synthetic resin material, a vinyl chloride piece, a synthetic rubber piece, a synthetic fiber piece, or the like can be used. An old tire can be cut and used as a synthetic rubber piece. Natural rubber materials can also be cut into small pieces for use.

As a device for press-fitting the water leakage prevention material 6, a boring machine 9 for drilling a hole toward the crack 2 of the embankment body 1 and inserting a supply pipe 8 for supplying the water leakage prevention material 6 into the drilled hole 7. And a pressure-feeding means 10 for pressure-feeding the water-leakage preventive material 6 to the boring machine 9, and a water-leakage-proof material manufacturing apparatus 11 for supplying the water-leakage preventive material 6 to the pressure-feeding means 10. As the pumping means 10, a pump 12 for supplying the water leakage preventing material 6 at a high pressure is used. As the water leakage prevention material manufacturing apparatus 11, a first tank 13 containing a fluid medium 4 and a second tank 1 containing a soft material 5
4, and the fluid medium 4 is supplied from the first tank 13;
The soft material 5 is supplied from the second tank 14, a mixer 15 for stirring the fluid medium 4 and the soft material 5, and a water leakage prevention material 6 is supplied from the mixer 15, and the water prevention material 6 is agitated. Agitator 1 to be supplied to pressure pump 12
6.

Next, a method of press-fitting the water leakage prevention material 6 into the crack 2 will be described with reference to FIGS. When a crack 2 occurs in the dam body 1 and water leakage occurs, the crack 2 inside the dam body 1 is drilled by a boring machine 9 (see FIG. 2). It is desirable that the degree of the crack 2 inside the embankment body 1 be detected by nondestructive inspection as to what kind of crack 2 is formed in which direction as much as possible.
Then, a hole is drilled toward the large crack 2 causing water leakage to form a hole 7 leading to the crack. Next, the detecting device 17 is inserted into the hole 7 thus drilled, and the amount of water leakage is measured (see FIG. 3). When the amount of water leakage is detected, a supply pipe 8 is inserted into the hole 7 (see FIG. 4), and a pressure pump 12 is connected to the supply pipe 8 via a hose. Then, a soft material 5 is mixed into the fluid medium 4 and the water leakage preventing material 6 is stirred and the pressure-feed pump 1
Pump by 2

When the water leakage prevention member 6 is pressed into the crack from the supply pipe 8 (see FIG. 5), the soft material 5 is sent into the crack 2 together with the fluid medium 4 in the crack 2. . At this time, the water leakage prevention material 6 flows together with the water 3 flowing out from the inside of the crack 2, but the soft material 5 gradually becomes entangled in the crack 2 and gradually closes the crack 2. Then, the soft material 5 entangled in the crack 2 is sequentially added to the soft material 5.
Are entangled and completely close crack 2.

When a fiber material such as a piece of cloth is used for the soft material 5 and cement milk is used for the fluid medium 4, the fiber material is entangled with the crack 2, and after the crack 2 is closed, the fiber material is The cement milk that has soaked into the cement is solidified, so that it can be completely repaired after the crack 2 is closed.

When an old tire is cut and used for the soft material 5, the cut end of the old tire elastically enters the crack 2 and closes the crack 2, so that the crack 2 can be closed instantaneously. Since it is useful for reuse of used tires, material costs can be saved, and costs for processing used tires can be saved.

[0016]

As described above, according to the dam water leakage prevention method of the present invention, the following effects can be obtained. This is a method of preventing water leakage resulting from cracks generated in the dam embankment, in which a water leakage prevention material obtained by mixing a soft material into a fluid medium is pressed into the crack, and the soft material is entangled in the crack. To close the crack and prevent water leakage, so that the crack can be closed quickly. Also, this is a construction method for preventing water leakage caused by a crack generated in a dam body, wherein a hole is drilled toward the inside of the crack, a supply pipe is inserted into the hole, and pump pressure is applied to the supply pipe. The water leakage prevention material which mixed the soft material into the fluid medium is pumped by using, the water leakage prevention material is pressed into the crack, and the soft material is entangled in the crack to close the crack and prevent water leakage Therefore, the crack can be closed quickly.

[Brief description of the drawings]

FIG. 1 is a conceptual sectional view showing an embodiment of a dam water leakage prevention method according to the present invention.

FIG. 2 is a conceptual cross-sectional view showing pre-drilling in a step of a dam leakage prevention method according to the present invention.

FIG. 3 is a conceptual cross-sectional view showing the measurement of the amount of water leakage in the step of the dam leakage prevention method according to the present invention.

FIG. 4 is a conceptual sectional view showing a supply pipe inserted state in a step of a dam water leakage prevention method according to the present invention.

FIG. 5 is a conceptual cross-sectional view showing a state in which a water leakage prevention material is pressed in a process of a water leakage prevention method of a dam according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Embankment body 2 Crack 3 Water 4 Fluid medium 5 Soft material 6 Water leakage prevention material 7 Hole 8 Supply pipe 9 Boring machine 10 Pressure feeding means 11 Water leakage prevention material manufacturing device 12 Pressure pump 13 First tank 14 Second tank 15 Mixer 16 Agitator

Claims (7)

[Claims] 1. A method for preventing water leakage caused by a crack generated in a dam body of a dam, wherein a water leakage prevention material obtained by mixing a soft material into a fluid medium is press-fitted into the crack and the crack is inserted into the crack. Water leakage prevention method for dams, characterized by entanglement of soft materials to close cracks and prevent water leakage. 2. A method for preventing water leakage caused by a crack generated in a dam embankment, wherein a hole is drilled toward the inside of the crack, and a supply pipe is inserted into the hole. Pumping the water leakage prevention material which mixed the soft material into the fluid medium by using the pump pressure to press the water leakage prevention material into the crack,
A water leakage prevention method for a dam, wherein the soft material is entangled in the crack to close the crack and prevent water leakage. 3. The dam leakage prevention method according to claim 1, wherein a medium mainly composed of cement milk is used as the fluid medium. 4. The dam leakage prevention method according to claim 1, wherein a fiber material is used as the soft material. 5. The method according to claim 4, wherein cloth or paper is used as the fiber material. 6. The dam leakage prevention method according to claim 1, wherein a synthetic rubber or a synthetic resin material is used as the soft material. 7. The method according to claim 6, wherein small pieces obtained by cutting old tires are used as the synthetic rubber.