JPH0380077B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to the function of a hole for draining water (hereinafter referred to as a drain hole) formed by inserting a strainer pipe into a borehole drilled in the ground or a structure. Concerning construction methods for restoring

[Technical Background and Prior Art] In order to eliminate groundwater that is thought to have an effect on landslides, it is common practice to provide drainage holes for water collection and drainage. A strainer pipe is inserted into this drainage hole for hole maintenance, but the function of this strainer pipe often deteriorates or is lost due to long-term use.

6 and 7 conceptually show the cause of the deterioration of the function of the strainer pipe, and the strainer pipe 2 inserted into the ground 1 is provided with a large number of holes 3 for draining water.

However, due to long-term use, this strainer pipe has developed silt A as shown by the symbol in the figure.

Clogged strainer hole B.

Silt C around the strainer pipe.

Deformation D of the ground around the outer edge of the strainer pipe.

Reduction of ground water path E.

When this happens, other problems occur.

Conventionally, in order to clean the strainer pipe, a method has been adopted in which high-pressure water is injected into the pipe to remove silt and clog the strainer hole. There is a disadvantage that the heavy use of high-pressure water may damage the strainer pipe or damage the ground itself.
There was also the inconvenience of having to transport large equipment that generates high-pressure water to an unstable site. Furthermore, in the conventional technology, the silt is simply removed by sending pressurized water, and therefore the function of the entire drainage hole cannot be restored sufficiently.

[Object of the Invention] Therefore, the object of the present invention is to easily remove silt from a strainer pipe and clog the strainer hole using relatively low-pressure water, and also to form a water path around the strainer pipe. [Structure of the Invention] According to the present invention, a water pipe with a jet nozzle attached to the tip thereof is inserted into a strainer pipe, and pressurized water is injected from the jet nozzle at the tip to create a water pipe inside the strainer pipe. A jet cleaning process for discharging silt and mud clogging the strainer holes, and a section packer equipped with a strainer section and a pair of air packers installed before and after the strainer section are attached to the tip of the water pipe. This process consists of a water injection process in which the strainer is inserted into the strainer pipe and water is supplied to each section to eliminate clogging of the strainer pipe and to regenerate or form a water path around the outside of the strainer pipe.

[Operations and Effects of the Invention] Therefore, since this construction method uses two processes, the jet cleaning process and the packer water injection process, it eliminates silt in the strainer pipe and clogging of the strainer hole, and also eliminates the silt in the strainer pipe and the area around the outside of the pipe. The function of the drain hole can be restored by regenerating the water path.

That is, even if a large amount of silt A exists in the strainer during the jet cleaning process, it is removed by the jet, so that the water pipe can be easily inserted. Furthermore, since fluid is ejected from the strainer hole using a section pumper, surrounding silt C can be removed and the water path E can also be expanded.

Therefore, by applying both steps, the sludge removal effect is improved, a suitable cleaning work can be performed, and the amount of water and pressure can be reduced.

[Preferred Embodiment] When carrying out the present invention, it is preferable that the water pipe has a double structure to simultaneously send water and air. By mixing in this way, the impact action and turbulence effect of the air combine to further improve the sludge removal effect.

Moreover, it is preferable to use a flexible material, such as vinyl chloride, for the double-walled water pipe. By doing this, it can be rolled up when not in use.
Easy to operate. A jet nozzle and a section packer attaching/detaching device may be provided at the tip of the water pipe.

It is best to use a water pipe conveyor to move the water pipes in and out of the drain hole. The water pipe conveying machine may use a hydraulically operated cylinder device, and the water pipe may be gripped by a clamp provided at the tip of the operating piston. Using such a water pipe conveyor allows remote control.

[Example] Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 5.

FIG. 1 shows the assumed layout of the site where the construction method of the present invention is implemented. A drainage hole 5 is drilled in a slope 4 in a known manner, and a strainer pipe, etc. has been inserted. The borehole for draining this water is, for example, 65 to 85 mm in diameter.
A strainer pipe with an outer diameter of about 40 to 60 mm is inserted into it. Each strainer pipe is approximately 4m long and has a circular hole with a diameter of 2 to 5mm and a slit with a width of 2mm and a length of 10cm. , inserted into a borehole for several tens of meters, for example.

Among the equipment used in the construction method of the present invention, the main ones are a water pipe conveyor 6, a generator 7, a water pump 8, a water storage tank 9, an air pump 10, etc.
As shown in the figure, it is arranged near the entrance of the drain hole 5. This water storage tank 9 has a water source 1 near the site.
1, water is supplied by a pump 12, a water supply hose 13, etc. The drainage hole function restoration method of the present invention is as follows:
It is divided into two main processes.

The first step is a jet cleaning step, and its main purpose is to discharge silt in the pipes and mud clogging the strainer holes. In this process, each device is arranged as shown in FIG. That is, a water pump 8, an air pump 10, a pressure gauge 14, and a flow meter 15 are connected to a water pipe 16 operated by the water pipe conveyor 6, and a jet nozzle 18 is attached to the tip of the water pipe 16. Pressurized water pressurized by the water pump 8 is sent through the water pipe 16, and at the same time pressurized air from the air pump 10 is sent through the hose 17. As shown in the figure, this hose 17 is placed inside the water pipe 16. Although not shown, the water pipe conveyor 6 has a device (for example, a storage drum) for storing the water pipe 16 containing a hose 17 of sufficient length (for example, several tens of meters).

The structure of the jet nozzle 18 is as shown in FIG. 4, and a protruding crown 19 is formed at the tip of the nozzle to break up silt and make it easier to advance. A hole 21 in the front direction, a diagonal hole 22 toward the tip, a nozzle hole 23 in the radial direction, and a diagonal hole 24 in the rear are opened from the flow path 20 inside the nozzle. The hole diameter of the nozzle can be selected from about 1 to 3 mm. The number of nozzle holes can also be selected depending on the condition of the strainer pipe, such as silt. Inside the flow path 20 inside the nozzle, an air nozzle 26 having a check valve 25 at its tip is connected to the hose 17.

Using the apparatus having the above configuration, each operation in this cleaning process can be further subdivided and listed as follows.

(1) Attach the pressure gauge 14, flow meter 15, etc. to the water pipe 16 and hose 17.

(2) Attach the jet nozzle 18 to the tip of the water pipe 16, and set the water pipe 16 on the water pipe conveyor 6.

(3) Insert the jet nozzle 18 into the strainer pipe 2 while operating the water pump 8 to inject the water in the water tank 9 into the water pipe. Then, the air pump 10 is operated to send air to the hose 17. During this period, the water pressure is maintained at 5 to 10 Kgf/ ^cm2 .
The flow rate is checked by the flowmeter 15 at regular intervals from the start of water supply.

(4) Insert the jet nozzle 18 as far as possible.

(5) When the drainage water from the strainer pipe 2 has subsided, reverse the water pipe conveyance machine while supplying water and collect the jet nozzle.

(6) During the cleaning process, record the nozzle position and the amount of water discharged from the strainer pipe 2.

After the cleaning process is completed, the water injection process will begin.
The purpose of this process is to unclog the strainer pipe and regenerate and form water channels around the outside of the pipe. The equipment used is shown in Figure 3. In place of the jet nozzle in the jet cleaning process, a section packer 27 is attached to the tip of the water pipe, and high pressure gas, such as nitrogen gas, is fed into the air packer 28 from a gas cylinder 29 through a pressurizing tube 30.

The structure of the air packer is as shown in FIG. 5, and the section packer 27 has air packers 28 installed before and after a strainer section 31 having a water injection hole 32. When the air packer is fed, the rubber part of the air packer expands and comes into close contact with the inner wall of the strainer pipe 2 to form a seal. Also, this section car 27 is also provided with an air nozzle 26 connected to the hose 17, and a check valve 2 is installed at the tip of the air nozzle 26.
5 is installed.

The work in this Patsuka water injection process can be broken down into the following parts:

(1) Connect the pressure gauge 14, flow meter 15, water pipe 16, etc. as shown in Figure 3.

(2) Set the position of the air packer 28 so that the length of the strainer portion 31 of the section packer 27 is between 1 and 5 m.

(3) Connect the section packer 27 to the tip of the water pipe 16, set the water pipe 16 on the water pipe conveyor 6, and move it deep into the strainer pipe 2 from the mouth.

(4) Insert the section car to the specified position.

(5) Send high pressure gas to the rubber part of the air packer 28 to inflate it and fix the packer. The gas pressure at this time is set to several kgf/cm ² .

(6) Water and air are sent to the strainer section 31 of the section car 27. As a result, the strainer pipe in the section is unclogged and the water channel is regenerated or formed. Check the water supply time and flow rate, and when the set water supply amount is reached,
Stop the water supply, release the gas, and move the section car to the next position.

(7) Water will be injected throughout the entire process by moving the section patrol cars one by one.

(8) After the water injection work is completed, reverse the water pipe conveyor and collect the section car.

(9) During the water injection process, record the location of the section tanker and the amount of water discharged from the strainer pipe mouth.

[Summary] As described above, in the process of restoring the function of the drain hole, the present invention first discharges silt in the pipe and mud clogging the strainer hole through a jet cleaning process, and then injects water into the drain hole. This process unclogs the strainer hole and regenerates or forms a water path around the outside of the pipe. By injecting air into the water, the sludge removal effect is further enhanced, and a low-pressure jet stream is created. The function of the drain hole can also be restored by

[Brief explanation of drawings]

Figure 1 is a conceptual diagram of the site where equipment implementing the present invention is installed, Figure 2 is an explanatory diagram showing the jet cleaning process, Figure 3 is an explanatory diagram showing the packer water injection process, and Figure 4 is a side view of the jet nozzle. , FIG. 5 is a side view of the section packer, FIG. 6 is a longitudinal cross-sectional view of the drain hole showing the cause of functional deterioration of the drain hole, and FIG. 7 is a cross-sectional view thereof. 1, 4...ground, 2...strainer pipe, 3
... Strainer hole, 5 ... Water drain hole, 6 ... Water pipe conveyor, 7 ... Generator, 8 ... Water pump, 9 ...
Water storage tank, 10... Air pump, 14... Pressure gauge, 15... Flow meter, 16... Water pipe, 18...
Jet nozzle, 27... section police car, 28...
...Air pack car, 29...Gas cylinder, 30...
Pressurized tube.

Claims (1)

[Claims] 1 In a method of restoring the function of a hole for water drainage, which consists of inserting a strainer pipe into a borehole drilled in the ground or a structure, etc., a water pipe with a jet nozzle attached to the tip is inserted into the strainer pipe, and the tip of the water pipe is inserted into the strainer pipe. a jet cleaning step in which silt in the strainer pipe and mud clogging the strainer hole are discharged by injecting pressurized water from a jet nozzle;
A section packer comprising a strainer section and a pair of air packers provided before and after the strainer section is attached to the tip of the water pipe, and the section packer is inserted into the strainer pipe to supply water section by section to prevent clogging of the strainer pipe. A method for restoring the function of drain holes, which consists of a water injection process that eliminates the problem and forms a water path around the outside of the strainer pipe.