JPH0696844B2 - Screen pipe placing method and its placing device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of placing a screen tube and a placing apparatus therefor.

[0002]

2. Description of the Related Art Conventionally, the driving of a screen pipe to be driven into the ground has been performed by the process shown in FIG. First, a hole is drilled in the ground while adding a casing by a rotary percussion drill in a screen tube placing device. After drilling the hole to an appropriate depth, the drill rod is pulled out while the casing is left inside the hole. Next, a screen tube was inserted into this casing, and after the insertion was completed, the casing was pulled out to complete the driving of the screen tube.

[0003]

However, such a method for placing a screen tube requires a lot of work because of the steps of placing and withdrawing the casing before and after the insertion of the screen tube, and perforating while adding the casing. Therefore, there is a problem that there is no place to put the casing when working in a narrow place such as a tunnel. The present invention has been made in view of the above problems, and an object thereof is to further simplify the step of placing a screen tube and improve work efficiency.

[0004]

Means for Solving the Problems The gist of the present invention for achieving the above object is to provide a rotary percussion drill in a screen pipe placing device with a net-like screen pipe which is only hit by a drill head, and the screen. A drill rod that is inserted into the pipe and that receives rotation and impact from the drill head, and the underground by the rotational force and impact force applied to the drill rod and the impact force applied to the screen pipe After drilling a hole in the hole, the drill rod is pulled out while leaving only the screen tube in the hole, and a joint sleeve is connected to a drill head that causes rotation and impact in a rotary percussion drill. Seal pad inside the water swivel with a reticulated screen tube Rotatably inserted through the joint sleeve, a drill rod having a bit is connected to the tip of the joint sleeve and inserted into the screen tube, and the tip of the joint sleeve is engaged with the sealing packing. It is because there is a protrusion that transmits the striking force from the drill head to the water swivel.

[0005]

The hole is drilled in the ground by rotating and hitting the drill rod, and at the same time, the screen tube is hit and the screen tube is inserted into the hole. Then, the screen tube is placed by pulling out the drill rod while leaving the screen tube in the hole. Further, since the screen tube is formed in a mesh shape, when the screen tube is used as a water collecting tube and a pipe roof, the water collecting efficiency and the penetration efficiency of the curing agent into the ground can be extremely increased.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. 1 is a front view of a screen tube placing device of the present invention, FIG. 2 is a sectional view of a rotary percussion drill, FIG. 3 is a sectional view taken along line aa of FIG. 2, and FIG. 4 is a sectional view of a screen tube.

The method for placing a screen tube according to the present invention is carried out by the apparatus for placing a screen tube shown in FIG. The screen pipe placing device is composed of a traveling device 1 and a rotary percussion drill 2. The rotary percussion drill 2 includes a drill head 3, a water swivel 5 attached to the drill head 3 via a joint sleeve 4, a screen tube 6 screwed to the water swivel 5, and a screen tube 6 inserted through the screen tube 6. And a drill rod 7.

The drill head 3 generates rotation and impact, and transmits these rotation and impact to the drill rod 7 through a joint sleeve 4 rotatably inserted in the water swivel 5. The impact from the drill head 3 is transmitted from the water swivel 5 to the screen tube 6 through the sealing packing 8 in which the projection 4a of the joint sleeve 4 is fitted between the projection 4a and the water swivel 5. This seal packing 8 is made of metal,
The projection 4a of the joint sleeve 4 is hooked on the upper surface, and the lower surface is engaged with the collar portion 5a of the water swivel 5 via the ring 8a.

As shown in FIGS. 4 and 5, the screen tube 6 is formed in a net-like cylindrical body 6c by vertical streaks 6a and spiral streaks 6b, and is formed by connecting a plurality of joint tubes 9 provided above and below it. To be done. In this connection, the joint pipe 9 at the tip is screwed inside the joint pipe 9 at the rear end of the other screen pipe 6, and is connected to the water swivel 5 via the coupler 10.

The drill rod 7 is inserted into the screen tube 6, and a bit 11 is detachably attached to the tip protruding from the screen tube 6. The bit 11 is formed to have the same or slightly larger outer diameter than the screen tube 6, and the fitting projection 7a of the drill rod 7 is fitted to the fitting groove 1
It is inserted into 1a and attached, and can be easily removed by pulling the drill rod 7 (on the left side in the drawing).

Next, a construction method for using the screen pipe 6 as a water collecting pipe and for using the screen pipe 6 as a pipe roof will be described. First, when the screen pipe 6 is used as a water collecting pipe, as shown in FIG. 6, a water collecting hole 12 is drilled in a predetermined ground by the rotary percussion drill 2. This allows the water collecting hole 12 to be drilled by the rotation of the drill rod 7, and at the same time, the screen tube 6 is inserted into the water collecting hole 12 by being hit by the drill head 3. The screen pipe 6 is inserted while being replenished at any time, so that the screen pipe 6 also has a function of preventing collapse of the hole wall of the water collecting hole 12.

When the water collecting hole 12 is perforated to an appropriate depth, the screen tube 6 is removed from the water swivel 5 and the drill rod 7 is pulled out to remove the bit 11 from the drill rod 7 and the water collecting hole 12 together with the screen tube 6. Will remain. Therefore, the screen tube 6 is placed in close contact with the hole wall with almost no gap between the screen tube 6 and the screen wall, and since the screen tube 6 has a net shape, the water collection efficiency can be extremely increased.

According to the present invention, the screen tube 6 can be driven at the same time when the holes are punched, so that the conventional step of driving and pulling out the casing can be omitted. Further, since the screen tube 6 is driven only by striking without rotating it, the screen tube 6 is not destroyed by the rotation.

Next, when the screen tube 6 is used as a pipe roof, as shown in FIG. 9, the reticulated screen tube 6 is cast along the outer periphery of the excavated cross section of the tunnel 13 by the same method as described above. . When the screen pipe 6 is placed, an injection pipe is inserted into the screen pipe 6 and a hardening agent 14 such as cement milk is press-fitted. Since the screen tube 6 has a mesh shape, the hardening agent 14 for
It is possible to further enhance the permeability of the. FIG. 11 shows a screen tube 6 for a pipe roof.

[0015]

As compared with the conventional driving method, the casing driving method and the drawing method can be omitted, so that the driving step can be greatly shortened and the driving operation can be made efficient. it can.

Since the screen tube has a mesh shape, when the screen tube is used as a water collecting hole or a pipe roof, the water collecting efficiency and the hardening agent permeating efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a front view of a screen tube placing device.

FIG. 2 is a sectional view of a rotary percussion drill.

3 is a sectional view taken along the line aa of FIG.

FIG. 4 is a sectional view of a screen tube.

FIG. 5 is a front view in which a screen tube is connected.

FIG. 6 is a cross-sectional view of a perforated water collection hole.

FIG. 7 is a cross-sectional view of the water collecting hole in which the bit is removed by pulling out the drill rod.

FIG. 8 is a cross-sectional view of a water collecting hole in which a drill rod is pulled out and a screen tube is installed.

FIG. 9 is a sectional view of a tunnel using a screen tube as a pipe roof.

FIG. 10 is a cross-sectional view of a state in which a screen tube is installed as a pipe roof.

FIG. 11 is a front view of a screen tube used as a pipe roof.

FIG. 12 is a block diagram showing a conventional screen tube placing step.

[Explanation of symbols]

 1 Traveling device 2 Rotary percussion drill 3 Drill head 4 Joint sleeve 5 Water swivel 6 Screen tube 7 Drill rod 8 Seal packing

Claims (2)

[Claims] 1. A reticulated screen pipe for receiving a rotary percussion drill in a screen pipe placing device only from a drill head, and a rotary percussion drill which is inserted into the screen pipe and is rotated and hit by the drill head. A drill rod is used to form a hole in the ground by the rotating force and the striking force applied to the drill rod and the striking force applied to the screen tube, and then only the screen tube is left in the hole. A method of placing a screen tube, which is characterized by pulling out the drill rod up to 2. A joint sleeve is connected to a drill head for generating rotation and impact in a rotary percussion drill of a screen tube placing device, and the joint sleeve seals in a water swivel equipped with a reticulated screen tube detachably. Is rotatably inserted through a packing, a drill rod having a bit is connected to the tip of the joint sleeve and inserted into the screen tube, and the tip of the joint sleeve is engaged with the seal packing. A screen tube placing device characterized in that a projection is provided for transmitting the striking force from the drill head to the water swivel.