JP4778638B2 - Perforated pipe and method for laying the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a technique for laying a water collection pipe, a water intake pipe, a discharge pipe, an injection pipe, etc. in the ground, underwater, underwater, etc., and a pipe having a through-hole in a pipe wall through which a fluid permeates an arbitrary part of the laying pipe The present invention relates to laying technology.
[0002]
[Prior art]
Penetration through the pipe wall over part or the entire length of the pipe for collecting water such as drainage, water intake, injection of chemicals, etc. in horizontal, inclined, vertical pipes laid in the ground, underwater, bottom of water, etc. There may be a need to lay pipes with holes. Since a tube having a through-hole in the tube wall usually has a large number of through-holes, hereinafter, a tube having a through-hole in the tube wall is generically referred to as a perforated tube. Of course, this 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 applicable to these. Moreover, although the following description mainly demonstrates the pipe | tube laid in the ground, this invention is not limited to this, It is applied also to the pipe | tube laid in water, a water bottom, etc.
[0003]
Conventionally, as a technique for installing a perforated pipe in the ground, there is a technique for drilling the ground to a predetermined diameter and inserting the perforated pipe into the excavated hole. In addition, there is a technique for making a hole in the pipe wall by perforation after laying the pipe in the ground.
[0004]
In the former technique, the drilling hole is drilled while supplying the necessary pressurized air or mud while the drilling pipe of a predetermined diameter enters the ground, and then the drilling pipe is lifted and re-applied to the pipe wall. A perforated pipe having a required through hole is inserted into the excavation hole. The perforated pipe may be a necessary part of the installed pipe length. In this case, since there is no object to be held in the mine due to the excavation pipe of the excavation pipe, the wall of the excavation hole is collapsed and the hole is deformed particularly in the excavation hole excavated in a deep excavation hole or soft ground. In that case, it is necessary to circulate the fluid even when the tube is inserted, and in the case of a porous tube that cannot do so, it may be difficult or impossible to insert. Moreover, when inserted in the state of a porous tube, earth and sand or the like may enter the tube, and the intended function may not be performed when the insertion is completed.
[0005]
The latter perforation work is a technique in which a pipe without a hole is installed at a predetermined position in the ground, and then a pipe wall is drilled from the inside of the pipe using explosives. This work is very expensive, and since the through hole is created by a flame, there is a problem that the shape of the through hole cannot be created other than a circular shape of a certain size. There are legal restrictions on how to implement this method.
[0006]
[Problems to be solved by the invention]
As described above, in the technology of laying a porous tube in the ground by the conventional method, in the technology of inserting the porous tube after excavating the excavation hole in advance, in the ground where soft ground and large formation pressure are applied at a long distance There are some conditions that make installation difficult and make insertion impossible. In addition, the perforation work is restricted in that this work is performed, and there is a problem in that the work cost is high and the shape of the opening of the through hole formed in the tube wall is limited.
[0007]
The present invention solves such problems of the prior art and provides a technique capable of inserting a perforated pipe into a drilling hole even if the drilling hole wall collapses. It is another object of the present invention to provide a technique for laying a porous tube in the ground without using explosives or the like. An object of the present invention is to lay a porous pipe in the ground so that it can be easily laid out by removing the restrictions due to the ground, and the degree of freedom of the shape of the opening is increased, and the construction is made at low cost. That is.
[0008]
[Means for Solving the Problems]
The present invention was made to solve the above problems, and as a technique for laying a pipe having a through hole in a pipe wall, a porous pipe is inserted into a drilled hole that has been excavated in advance. If there is a collapse or deformation of the borehole wall, insertion becomes difficult. In such a case, the present invention makes it possible to smoothly insert the pipe by making the porous pipe free from through holes and circulating the fluid in the pipe to correct the collapse or deformation of the excavation hole. At the same time, the inflow of earth and sand into the pipe was prevented during insertion. That is, the present invention is a circular pipe in which a through-hole through which fluid permeates is provided in advance in the pipe wall, and the circular pipe is a circular pipe closed by a closing material that closes the through-hole from the inside of the pipe, and the closing material is in the pipe A cylindrical member that covers the entire surface of the circumference, and after the circular pipe is propelled and laid in the ground, the closing material is cut from the inside of the circular pipe by a cutting blade that is inserted into the circular pipe from the pipe end and rotates around the pipe axis. It is a porous tube characterized by having a structure to be removed . The closing material layer covering the entire inner peripheral surface of the pipe may be filled with a filler on the entire cross section of the pipe, and the center portion of the filler may be pulled out with a cutter or the like. It may be a thing. In addition, depending on geological conditions, this porous tube is not inserted into a hole excavated in advance, but is used as a drilling tube from the beginning, and is left in the ground after excavation to remove the closing material and used as a porous tube. You can also.
[0009]
The porous tube of the present invention is used as a tube having no through-hole in the tube wall in the laying step, and after laying in the ground, the sealing material blocking the through-hole in the tube wall is removed to open the through-hole, It can be used as a tube or the like. In addition, if the closing material is a lining member or a member that closes each through-hole, and this closing material has a function of keeping the through-hole closed against pressure from the inside of the pipe, it passes through this pipe. In addition, the excavating pressure fluid or mud water can be supplied to the excavating blade tip and used as an underground excavation pipe. This closing material closes and closes the through hole in the tube wall from the inside, and prevents excavation pressure water or the like from escaping from the through hole in the excavation process. This closing material can be removed after excavation by inserting a cutting blade or the like into the pipe.
[0010]
The closing material used for the porous tube of the present invention can be selected according to the size of the through hole in the tube wall, the pressure in the tube during excavation, and other conditions. For example, a material such as mortar, concrete, plastic, or other solidifying material may be used as a layer covering the entire inner peripheral surface of the tube, with the inner surface being lined. Further, it may be a plug-like or lid-like member that closes the through-holes of the tube wall . This closing material closes the through-hole against the digging pressure inside the pipe, and after laying the pipe, it is removed from the through-hole by cutting, cutting, shearing, blasting, or vacuum suction from the inside of the pipe. A member to be opened may be used. The plug-like or lid-like closing material can be a molded product made of metal, non-metal, synthetic resin, or the like, and may be attached by adhesion, fitting, solidification molding, expansion, mechanical fastening, or the like. In some cases, a material partially including a portion having a readily soluble or easily destructible property due to a chemical or a solvent at the time of removal may be used.
[0011]
The method of the present invention uses a porous tube having a through-hole through which a fluid passes as described above, a closing material that closes the through-hole, and the closing material is removable from the inside of the tube. After laying the porous tube in the ground, a rotary blade that cuts the closing material from the inside of the tube is inserted into the porous tube, and the closing material is cut and removed to open the through hole, thereby laying with permeability A method of laying a perforated pipe, characterized by installing a pipe. In the process of laying pipes in the ground, in addition to the normal laying method that is inserted into a hole that has been excavated in advance, the excavation method, propulsion method, subsidence method, etc. may be used. Depending on the shape, properties, etc., it is possible to use various means known in the art such as cutting and removing with a rotary blade.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
The perforated pipe and its laying method according to the present invention use a pipe having a through-hole in the pipe wall in advance as a drilling pipe or the like by closing the through-hole with a closing material and removing the closing material after laying. It is designed to function as a perforated tube. Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0013]
FIG. 1 is a partial perspective view showing a porous tube 1 according to an embodiment of the present invention. A through hole 3 is provided in the tube wall 2. Although the through hole 3 has a slit shape in FIG. 1, the shape is not limited. A closing material 11 is filled in the porous tube 1. Although the hollow hole 12 is shown in the example of FIG. 1, depending on the case, the hollow hole 12 may be omitted and the entire surface of the tube cross section may be filled with the closing material 11. As the porous tube 1, a steel tube, a concrete tube, or the like can be used. The opening shape of the through hole 3 may be any of a round hole, a square hole, a slit, a mesh, and the like, and the size and arrangement thereof may be arbitrarily determined according to the purpose. As the closing material 11 for closing the through-hole, a molding material such as a cement-based or other solidifying material or expanded polystyrene can be used as a filler or a lining material. The means for filling or lining may be any of foaming, pouring, centrifugal pasting, mold fitting and the like. Further, in order to use a lid, a plug, or the like that closes each through-hole as the closing material 11, it can be used by being fixed by adhesion, locking, expansion, fitting, or the like. These closing materials 11 act as closing materials in the laying process, excavation, and propulsion processes, and have shapes and performances that can be removed from the inside of the pipe and opened through holes later by cutting, cutting, heating, etc. To do.
[0014]
FIG. 2 is an explanatory diagram of the laying process, and shows the process of inserting the porous tube 1 of the embodiment into the excavation hole 8 in the direction indicated by the arrow 6. The porous tube 1 is provided with a closing material 11 for closing the through-hole 3 in a layer shape covering the entire peripheral surface in the tube, and is inserted into the tube while being used as a passage for compressed air, high-pressure water, mud water, and the like.
[0015]
FIG. 3 is an explanatory view of an embodiment showing a process of removing the closing material 11 with the removal blade 13. After removing the closing material 11, the porous tube 1 is used as a tube in which the through hole 3 is opened.
[0016]
In the porous tube of the present invention, the through-hole is closed with a closing material, so that the action of maintaining the internal pressure is obtained in the same manner as a normal tube without a hole. When the porous tube of the present invention is inserted into a drilling hole, the through hole is sealed, so it can be handled in the same way as a tube without a through hole, and the drilling fluid is circulated through the tube and used. can do. Therefore, even if the wall of the excavation hole is collapsed, it can be inserted into the ground like the excavation pipe without being restricted by the ground condition.
[0017]
On the other hand, since it is possible to perform, for example, a filtering function on the through hole in the tube wall, the shape and size of the opening required by the formation or liquid layer can be arbitrarily selected.
[0018]
FIG. 4 is a partial perspective view of a porous tube 1 of another embodiment, and a round hole is provided as the through hole 3 .
[0019]
Examples of the perforated pipe laying work in which the method of the present invention is effective include drainage of tunnels, drainage for landslide countermeasures, collection of soil pollutants, seawater intake, wells, hot springs, oil, gas, geothermal power generation, etc. It is suitable for construction work such as intake pipes, various discharge pipes, injection of chemicals for ground improvement, anchor placement for ground improvement from the tip of the anchor, injection pipes used for injection of soil contamination neutralizers, and the like.
[0020]
【The invention's effect】
As described above, according to the present invention, when a porous tube is laid in the ground or the like, it is possible to reliably lay a desired porous tube at a desired location without being affected by the conditions of the ground. Compared to the conventional technique, the construction cost can be greatly reduced.
[Brief description of the 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.
[Explanation of symbols]
1 Porous tube 2 Tube wall 3 Through hole (slit)
4 Excavation Blade 5 Excavation Ground 6 Excavation Direction Arrow 7 Inner Surface 11 Closing Material 12 Hollow Hole 13 Removal Tool

Claims (2)

A circular pipe in which a through-hole through which fluid passes is provided in advance in a pipe wall, and the circular pipe is a circular pipe closed by a closing material that closes the through-hole from the inside of the pipe, and the closing material covers the entire inner peripheral surface of the pipe A cylindrical member is constructed, and after the circular pipe is laid in the ground, the closing material is cut and removed from the inside of the circular pipe with a cutting blade that is inserted into the circular pipe from the pipe end and rotates around the pipe axis. A perforated tube characterized by After the porous pipe according to claim 1 is laid in the ground, a rotary blade for cutting the closing material from the inside of the pipe is inserted into the porous pipe, the closing material is removed by cutting, and the through hole is opened. A method of laying a perforated pipe, characterized in that a laying pipe having a property is installed.

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