JP2003056756A - Perforated pipe and its placing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide technique for placing a perforated pipe into the ground, facilitating the placement of the perforated pipe with openings in optional shapes into the ground even when the wall of a drilled hole to insert the perforated pipe therein is collapsed. SOLUTION: Through-holes 3 permeable to a fluid are provided in a pipe wall 2 and a closing material 11 is provided for closing the through-holes 3. The closing material 11 uses the perforated pipe 1 constructed to be removable from the inside of the pipe. After the perforated pipe is inserted into the drilled hole, the closing material 11 is removed to make the through-hole 3 open and the permeable pipe to be placed is installed into the ground.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a water collecting pipe, an intake pipe,
The present invention relates to a technique for laying a discharge pipe, an injection pipe, and the like in the ground, water, a water bottom, and the like, and to a laying technique for laying a pipe having a through hole through which a fluid permeates in an arbitrary portion of the laid pipe.

[0002]

2. Description of the Related Art Horizontal laying in the ground, underwater, underwater, etc.
It is necessary to lay a pipe with a through hole in the pipe wall over a part or the entire length of the pipe line for the purpose of collecting water such as draining water, injecting chemicals, etc. into a slope or vertical pipe. There are cases. Since a pipe having a through hole in the pipe wall usually has a large number of through holes, hereinafter, in the present specification, a pipe having a through hole in the pipe wall is generically referred to as a perforated pipe. Of course, the present invention does not exclude a tube having a single through hole or a small number of through holes in the tube wall, and the present invention is also applied to these. Further, in the following description, a pipe that is laid in the ground will be mainly described, but the present invention is not limited to this and is also applied to pipes that are laid in water, a water bottom, and the like.

Conventionally, as a technique for installing a perforated pipe in the ground, there is a technique for boring the ground to a predetermined diameter and inserting the perforated pipe into the drilled hole. After laying the pipe in the ground,
There is a technique of making holes in the pipe wall by perforation work.

In the former technique, while supplying a necessary compressed air or muddy water while advancing an excavation pipe having a predetermined diameter into the ground,
The drilling hole is drilled, then the drilling pipe is lifted, and a perforated pipe having a required through hole in the pipe wall is again inserted into the drilling hole. The perforated pipe may be a necessary portion of the laid pipe length. In this case, since the object to be held in the mine disappears due to the lifting of the digging pipe, the collapse of the wall of the digging hole and the deformation of the hole occur especially in the digging hole having a large depth or the digging hole in the soft ground. In that case, it is necessary to circulate the fluid at the time of inserting the pipe, and in the case of a perforated pipe that cannot do so, it may be difficult or impossible to insert the pipe. In addition, when the tube is inserted in the state of a perforated tube, there is a possibility that earth and sand enter the tube and the intended function cannot be performed when the insertion is completed.

The latter perforation work is a technique in which a pipe without holes is installed at a predetermined position in the ground, and then a pipe wall is bored from the inside of the pipe by using explosives. This work is very expensive, and since the through holes are created by the flame, there is a problem that the shape of the through holes can only be made in a circular shape of a certain size. There are legal restrictions on the use of this method.

[0006]

As described above, in the technique of laying a perforated pipe in the ground by the conventional method,
In the technique of inserting a perforated pipe after excavating a drill hole in advance,
When the distance becomes long, it is difficult to construct on soft ground and ground to which large formation pressure is applied, and there are also conditions that make it impossible to insert. Further, regarding the perforation work, there is a problem in that the work is restricted, the construction cost is high, and the shape of the opening of the through hole formed in the pipe wall is limited.

The present invention solves the problems of the prior art and provides a technique capable of inserting a perforated pipe into a drill hole even if the wall of the drill hole collapses. Another object is to provide a technique for laying a perforated pipe in the ground without using gunpowder or the like. An object of the present invention is to lay a perforated pipe in the ground so that it can be easily laid without the restriction of the ground, and the degree of freedom of the opening shape is increased, so that the pipe can be constructed at low cost. That is.

[0008]

The present invention has been made to solve the above-mentioned problems, and as a technique for laying a pipe having a through hole in a pipe wall, a perforated pipe is provided in a previously drilled hole. When the wall of the borehole is collapsed or deformed at this time, the insertion becomes difficult. In such a case, the present invention allows the perforated pipe to have no through hole, circulates a fluid in the pipe to correct collapse or deformation of the drill hole, and allows the pipe to be smoothly inserted. At the same time, it was designed to prevent the inflow of earth and sand into the pipe during insertion. That is, the present invention provides a perforated pipe characterized in that a through hole through which a fluid permeates is provided in a pipe wall, a closing member for closing the through hole is provided, and the closing member has a structure removable from the inside of the pipe. . The closing material may be a filling material that fills the entire cross section of the pipe, a layer that covers the entire inner circumferential surface of the pipe, or a member that closes each through hole. The layer covering the entire inner peripheral surface of the pipe may be one in which the entire cross section of the pipe is filled with a filler and the central portion of the filler is cut out by a cutter or the like, or a layer formed by sticking or the like like an inner lining. . Depending on the geological conditions, this perforated pipe is not inserted into a previously excavated hole, but is used as an excavated pipe from the beginning and left as it is in the ground after excavation to remove the closing material and used as a perforated pipe. You can also

The perforated pipe of the present invention is used as a pipe having no through hole in the pipe wall in the laying process, and after laying in the ground, the through hole is opened by removing the closing material that blocks the through hole of the pipe wall. Let
It can be used as a water permeable pipe or the like. Also,
If the closing material is a lining member or a member that closes individual through holes, and if this closing material has the function of keeping the through holes closed against the pressure from the inside of the pipe fitting, drilling through this pipe It is also possible to supply a pressure fluid or muddy water for use to an excavating blade to use as an underground excavating pipe. This closing material closes and closes the through hole of the pipe wall from the inside so that pressurized water for excavation or the like does not escape from the through hole in the excavation process.
After the excavation, this closing material can be removed by inserting a cutting blade or the like into the pipe.

The closing material used in the perforated pipe of the present invention can be selected according to the size of the through hole in the pipe wall, the pipe internal pressure during excavation and other conditions. For example, mortar, concrete, plastic, as a layer covering the entire inner surface of the pipe,
In addition, a material such as a solidifying material may be used by lining the inner surface of the pipe. Further, a plug-like or lid-like closing member for closing each of the through holes of the pipe wall, the through holes are closed for the pressure for excavation inside the pipe, after pipe laying, cutting from inside the pipe, cutting,
A member that is removed from the through hole by shearing, blasting, vacuum suction, or the like to open the through hole may be used. As the plug-like or lid-like closing material, a molded product made of metal, non-metal, synthetic resin or the like can be used, and may be attached by adhesion, fitting, solidification molding, expansion, mechanical fastening or the like.
Depending on the case, a material having a part that is easily soluble or easily destructible by a chemical agent or a solvent at the time of removal may be used.

The method of the present invention comprises a perforated tube having a through hole through which a fluid permeates, as described above, in the wall of the tube, and a closing member for closing the through hole. A method for laying a perforated pipe is characterized in that the perforated pipe is laid in the ground, and then the closing material is removed to install a permeable underground pipe. In the process of laying the pipe in the ground, in addition to the usual laying method that inserts it into the previously drilled hole, excavation method, propulsion method, sinking method, etc. may be used. Alternatively, various known means can be used, such as cutting and removing with a rotary blade according to the shape and properties.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION A perforated pipe according to the present invention and a method for laying the same are provided by using a pipe having a through hole in a pipe wall in advance, which is used as an excavation pipe or the like by closing the through hole with a closing material. By removing the closing material, it functions as a perforated pipe. Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a partial perspective view showing a perforated tube 1 according to an embodiment of the present invention. The tube wall 2 is provided with a through hole 3. Although the through hole 3 has a slit shape in FIG. 1, the shape is not limited. The inside of the perforated pipe 1 is filled with a closing material 11. Although the hollow hole 12 is shown in the example of FIG. 1, the hollow hole 12 may be omitted and the closing member 11 may be filled in the entire cross section of the pipe in some cases. As the perforated pipe 1, a steel pipe, a concrete pipe or the like can be used. Further, the opening shape of the through hole 3 may be any of a round hole, a square hole, a slit, a mesh, etc., and its size and arrangement may be arbitrarily determined according to the purpose. As the closing material 11 for closing the through hole, cement-based or other solidifying material,
A molding material such as Styrofoam can be used as the filler or the lining material. Means for filling or lining may be any of foaming, pouring, centrifugal separation, mold fitting and the like. Further, in order to use a lid, a plug, or the like for closing each through hole as the closing member 11, it is possible to fix it by adhesion, locking, expansion, fitting, or the like. These closing members 11 act as closing members in the laying process, excavation process, and propulsion process,
It shall have a shape and performance capable of opening the through hole by removing it from the inside of the pipe by cutting, cutting, heating, etc. at a later date.

FIG. 2 is an explanatory view of the laying process, showing the process of inserting the perforated pipe 1 of the embodiment into the excavation hole 8 in the direction indicated by the arrow 6. The perforated pipe 1 is provided with a closing member 11 for closing the through hole 3 in a layered form covering the entire circumferential surface inside the pipe, and is inserted while using the inside of the pipe as a passage for compressed air, high pressure water, muddy water or the like.

FIG. 3 is an explanatory view showing a process of removing the closing member 11 with the removing blade 13. After removing the closing material 11, the perforated pipe 1 is used as a pipe having a through hole 3 opened.

Since the through hole of the porous tube of the present invention is closed by the closing material, the function of retaining the internal pressure can be obtained as in a normal tube having no hole. When the perforated pipe of the present invention is inserted into a drill hole, since the through hole is sealed, it can be handled in the same manner as a pipe without a through hole, and a fluid for drilling is circulated through the pipe for use. can do. Therefore,
Even if the wall of the drill hole is collapsed, it can be inserted into the ground like a drill pipe without being restricted by the condition of the ground.

On the other hand, since the through hole of the pipe wall can be processed to give, for example, a filter function, the shape and size of the opening required by the formation or liquid layer can be arbitrarily selected. .

FIG. 4 is a partial perspective view of a porous tube 1 of another embodiment, in which a round hole is provided as a through hole 3. An example of the closing material that closes the through hole 3 is shown in FIGS. 5 and 6
4A and 4B show different examples, and are cross-sectional views taken along the line AA of FIG. In FIG. 5, a mushroom-shaped closing member 14 having feet inserted into the through holes 3 is attached to the inner surface 7 of the tube wall 2 with an adhesive 15 on the inner surface of the tube. FIG. 6 shows a closing member made of a plug in which the expansion insert 16 is inserted into the through hole 3 and the bolt 18 is screwed in to crimp the expansion insert 16 into the through hole 3 to lock the expansion insert 16. The insert 16 and the bolt 18 are made of, for example, a synthetic resin, and are provided with a portion projecting toward the pipe inner surface 7 side, and when removed from the inside of the pipe, the insert 16 and the bolt 1
8 is broken and removed, and the through hole 3 opens. 5 and 6
Is an example, and it is optional to use other known attachment means for attaching the closure.

Examples of the perforated pipe construction work in which the construction method of the present invention is effective include drainage of tunnels, drainage for countermeasures against landslides, collection of soil pollutants, seawater intake, wells, hot springs, oil, gas, and geothermal heat. Water intake pipes for power generation, various discharge pipes,
It is also suitable for construction work such as injection of chemicals for ground improvement, anchor placement to improve the ground from the anchor tip, and injection pipes used for injection of soil contamination neutralizer.

[0020]

As described above, according to the present invention, when a perforated pipe is laid in the ground or the like, the desired perforated pipe can be surely placed in a desired place without being influenced by the conditions of the ground. It can be laid and has an excellent effect that the construction cost can be significantly reduced as compared with the conventional one.

[Brief description of drawings]

FIG. 1 is a partial perspective view of a porous tube according to an embodiment.

FIG. 2 is an explanatory diagram of an excavation process.

FIG. 3 is an explanatory diagram of a closing material removing step.

FIG. 4 is a partial perspective view of a porous tube according to another embodiment.

5 is an example of a cross-sectional view taken along the line AA of FIG.

FIG. 6 is another example of a cross-sectional view taken along the line AA of FIG.

[Explanation of symbols]

1 Perforated tube 2 pipe wall 3 Through holes (slits) 4 Excavator 5 excavated ground 6 Direction arrow 7 Inside 11 Closing material 12 hollow holes 13 Removal knife 14 Closing material 15 Adhesive 16 Closing material 18 volt

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Ryo Ushio             3-20-16 Nishiazabu, Minato-ku, Tokyo Sea of Japan             Within Yo Drilling Co., Ltd F-term (reference) 2D044 EA03                 3H111 AA01 BA02 BA07 BA15

Claims (4)

[Claims] 1. A perforated pipe characterized in that a through hole through which a fluid passes is provided in a pipe wall, and a closing member for closing the through hole is provided, and the closing member has a structure that can be removed from the inside of the pipe. 2. The perforated pipe according to claim 1, wherein the closing member is a layer covering the entire inner peripheral surface of the pipe. 3. The perforated pipe according to claim 1, wherein the closing member is a member that closes each through hole. 4. The perforated pipe according to claim 1, wherein after the perforated pipe is laid, the closing member is removed to open the through hole, and a perforated pipe is installed. Method.