JPH0689558B2 - Water collecting well and lateral well construction method for water collecting well - Google Patents

Description

TECHNICAL FIELD The present invention relates to a water collecting well and a method for constructing a lateral hole in the water collecting well.

(Prior Art) Water sources for waterworks include wells for rivers, underground water, or aquifer groundwater.

Conventionally, when a well is used as a water source, a vertical well is dug, a lateral hole is dug on the inner wall surface of the vertical well, and water is collected from the lateral hole into the well.

In particular, the lateral holes are formed by driving the pipe body 3 as shown in FIG. 6 by driving with a boring excavator. A plurality of slits 4 ... Are formed on the peripheral surface of the pipe body 3, and a head 2 for excavation is provided at the tip.

Then, the tube body 3 becomes a tube body for collecting water as it is, and the tube body 3
The water flowing into the pipe 3 from the slits 4 on the peripheral surface is collected in the vertical well.

(Problems to be Solved by the Invention) However, in the above-mentioned water collecting well, many slits 4 are opened in the tubular body 3 for horizontal holes to collect a large amount of water. In the case where the slits 4 ... Are provided, the slits 4 ... Are clogged and a sufficient amount of water cannot be secured.

Further, the work of forming the slits 4 ... In the tube body 3 involves opening a hole in a curved surface, which is troublesome and requires a long processing time. On the other hand, too many slits 4 ...
If a large number of holes are formed, a sufficient strength may not be ensured at the time of driving, which may cause deformation.

For this reason, the conventional pipe body 3 for collecting water is not satisfactory in view of the aperture ratio.

Then, this invention was made | formed in order to solve the said subject, and an object of this invention is to provide the water collection well which can secure a large amount of water collection, and the horizontal hole construction method of a water collection well.

(Means for Solving the Problem) In order to solve the above problem, the present invention has the following configuration.

As a method of constructing a lateral hole of a water collecting well, a lateral hole is bored by an air hammer excavator equipped with a bit for drilling at the tip of a tubular guide body on the inner wall surface of the water collecting well, and the guide body is formed. The water collecting pipe is inserted into the inside of the container, and then the guide body is pulled out.

Further, as the water collecting pipe, a pipe body in which a wire is spirally wound may be used.

Further, as a water collecting well, in a water collecting well in which horizontal holes are dug radially on the inner wall surface and water is collected from the horizontal holes, a water collecting pipe formed by spirally winding a wire around the horizontal hole is used. It is characterized in that it is provided.

(Operation) Next, the operation will be described.

First, a water collecting well for water collection is dug, and a lateral hole is bored on the side wall surface of the water collecting well by an air hammer excavator having an excavating bit so as to guide a tubular guide body. After that, a water collecting pipe having an excellent water collecting ability is inserted inside the guide body, and the guide body is pulled out.

By such a method, it is possible to dispose the water collecting pipe in which the wire is spirally wound in the lateral hole.

(Examples) Hereinafter, preferred examples of the present invention will be described in detail with reference to the accompanying drawings.

First, dig a vertical water collection well 10 as a water source for water supply (Fig. 3). The water collecting well 10 is dug by a conventionally known method, and the inner wall surface is covered with a plurality of segments 11 and is earthed.

Then, a horizontal hole is dug in the water collecting well 10, and water is collected in the water collecting well 10 from this horizontal hole. Here, a method of digging a lateral hole will be described with reference to FIG.

A drilling rod is inserted into a guide pipe 12 as a hollow casing pipe, and a drilling bit 14 is attached to the tip of this drilling rod.
A horizontal hole 20 having a predetermined length is bored by an excavator provided with. The excavator is excavated by an air hammer. The lateral hole 20 is a hole whose tip is slightly elevated.

When the horizontal hole 20 is dug to a predetermined length, the excavation is stopped. Then, as conventionally known, the diameter of the excavating bit 14 is reduced by rotating the excavating rod having the excavating bit 14 at the tip in the opposite direction, and the excavating bit 14 is guided by the guide pipe.
Pull out from 12.

Next, insert the water collection pipe 16 into the guide pipe 12
To leave the water collecting pipe 16 in the lateral hole 20.

A portion of the water collection pipe 16 facing the water collection well 10 is projected into the water collection well 10, and a valve 18 is provided at the tip of the water collection well 10.
Caulk the hole drilled in 11.

Similarly, a plurality of lateral holes 20 ... Are bored in the peripheral surface of the water collecting well 10 and the water collecting pipe 16 is arranged (see FIG. 4).

Further, as shown in FIG. 5, the water collecting pipe 16 is formed by winding a wire rod 17 such as a thin wire in a spiral shape and winding the wire rod so that adjacent wire rods hold a slight gap between them to form a tubular body. Use a water-soluble material. It is a so-called wound screen. The vicinity of the protruding portion of the water collection pipe 16 into the water collection well 10 is a pipe body that is not a winding type screen because water is not collected.

As described above, the water collecting pipe 16 is provided in the lateral hole 20 ... of the water collecting well 10.
The wire rod that was spirally wound on this water collection pipe 16
A large amount of water can invade from the gap 17 and further collect water from the water collection pipe 16 to the water collection well 10.

Although various descriptions have been given above with reference to the preferred embodiments of the present invention, it goes without saying that the present invention is not limited to the above-described embodiments, and many modifications are made without departing from the spirit of the invention. Of course, it can be applied.

(Effects of the Invention) Since the present invention is configured as described above, the following remarkable effects are exhibited.

1) After inserting the guide pipe with the water collection pipe with the water collection capacity,
Since the water collecting pipe is inserted into the guide pipe, it can be easily inserted into the lateral hole without damaging the water collecting pipe.

2) Further, by using a tube body formed by winding a wire rod as the water collecting pipe, it is possible to construct a water collecting well having an extremely large water collecting amount.

3) Conventionally, the water collecting pipe with slits in the pipe body was extremely troublesome to manufacture and the water collecting capacity was not sufficient, but by using the water collecting pipe wound with the wire rod, the durability is excellent. It is possible to secure a sufficient amount of water collection efficiently.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view showing a drilled state of a horizontal hole, FIG. 2 is a cross-sectional explanatory view showing a construction state of a horizontal hole, FIG. 3 is a cross-sectional explanatory view showing a water collecting well, and FIG. Fig. 5 is a plan view of a well, Fig. 5 is a partial perspective view of a water collection pipe, and Fig. 6 is an explanatory view of a conventional water collection pipe. 10 …… water collection well, 11 …… segment, 14 …… excavation bit, 16 …… water collection pipe, 17 …… wire rod, 18 …… valve, 20 …… horizontal hole.

Claims (3)

[Claims] 1. A horizontal hole is bored on an inner wall surface of a water collecting well by an air hammer excavator having a drilling bit at the tip of a tubular guide body, and a water collecting pipe is provided inside the guide body. A lateral well construction method for a water collection well, characterized in that the guide body is inserted and then extracted. 2. The method for constructing a lateral hole in a water collecting well according to claim 1, wherein a tube body in which a wire is spirally wound is used as the water collecting tube. 3. A water collecting well in which horizontal holes are radially formed in an inner wall surface and water is collected from the horizontal holes, and a water collecting pipe formed by spirally winding a wire is arranged in the horizontal hole. A water collection well characterized by this.