JP2005054987A - Newly laid pipe surface damage preventive towing and jacking method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform towing and jacking of a newly laid pipe fitted to the rear of an underground supply pipe reasonably and protect the surface of the pipe with material for preventing damage of the surface, which is thin and hard and of high strength. <P>SOLUTION: In laying a newly laid pipe by towing and jacking method, according to this means, for reducing the damage of the pipe surface even if the newly laid pipe is passed under the ground, the newly laid pipe surface is protected using a protective member which is thin to be low-resistance to earth, formed of material such as metal, resin or chemical fiber and hard and of high strength, to perform towing and jacking, and the protective member is left as it is still installed on the newly laid pipe or removed by pulling after the pipe is laid. According to another means, a temporary pipe is installed in the rear of the existing pipe, the temporary pipe having a larger bore diameter than a newly laid pipe is once passed to reduce the resistance of earth applied in leading in the newly laid pipe. According to still another means, a temporary pipe is installed for the purpose of towing a newly laid pipe having a larger bore diameter than the existing pipe, and the newly laid pipe is connected to a thick rope in the temporary pipe and the newly laid pipe with high towing resistance is towed without breaking the rope to perform replacement of the laid pipe. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  In order to prevent damage to the surface of a new pipe used when laying a supply pipe or the like buried in the ground by a non-cutting method, the present invention pulls or propels the new pipe with a protective material on the surface. For construction methods.

When the supply pipe that branches from the main pipe such as a water pipe or gas pipe to each household is replaced by non-cutting using stainless steel pipe, polyethylene pipe, etc., a new pipe is connected behind the supply pipe to pull or propel it. However, the surface of the new pipe will be damaged when moving through the ground, and the quality of the new pipe will be deteriorated, or when the new pipe with a larger diameter than the existing pipe is replaced, the cord will be too small to break. Is a problem.
JP-A-8-210666
For example, in Patent Document 1, as a method of providing a flexible water supply pipe while preventing the internal hose from being crushed, as a water supply pipe made of a protective tube in which a metal strip member is spirally wound around the outer surface of a soft resin hose. A method is described. Japanese Patent Application No. 9-100895
For example, in Patent Document 1, as a method of absorbing a shock that can be bent as a water supply pipe and only when a strong impact such as an earthquake occurs, a spiral pipe made of a soft resin sheath on the outer peripheral surface of a metal corrugated pipe body is described. The description is made.

Problems to be solved by the invention

  The new pipe installed behind the supply pipe buried in the ground can be towed and propelled without difficulty, and the problem is to protect the surface with a thin and hard material that does not damage the surface. is there.

Means for solving the problem

  When laying a new pipe by the towing and propulsion method, in order to reduce damage even if the surface of the new pipe passes through the soil, it is made of a thin metal, resin, chemical fiber, or other material that has low soil resistance. Protect and protect the surface of the new pipe using a protective member, and remove the protective material while it is installed in the new pipe, or pull it out after laying, or install a temporary pipe behind the existing pipe The temporary pipe is installed for the purpose of reducing the resistance of the soil applied when the new pipe is retracted by passing a temporary pipe with a larger diameter than the new pipe, and for pulling the new pipe with a larger diameter than the existing pipe. A means that enables the replacement of cloths by connecting to a thick cable in a temporary pipe and pulling a new pipe with a large traction resistance without breaking the cable.

The invention's effect

  By protecting the surface of the new pipe by the above method, the installed new pipe will not be damaged even if it passes through the soil, and a new pipe with a larger diameter will be installed by pulling the existing pipe with a smaller diameter. Since there is no risk of water leakage after laying a new pipe, the towing or propulsion method can be employed with peace of mind.

  Prior to pulling out the existing pipe, the present invention provides a protective material having a strength that does not affect the new pipe even if it passes through the ground to the new pipe connected to the rear according to the length of the new pipe. The best mode is to install only the necessary amount.

Since the new pipe protecting material passes through the ground which is not necessarily a straight line, it must maintain flexibility.
As a material having strength while maintaining flexibility, a method of continuously attaching a plurality of short cylindrical metals, resins, rubbers, etc., or a cloth, such as metals, chemical fibers, resins, rubbers, etc. Protect the new pipe with one that weaves and keeps the pipe shape, or with a spiral shape wound around the surface of the new pipe, a wavy shape, or other pipe shape that has flexibility The best mode is a method that can be towed and propelled, and in some cases only the protective material can be pulled out.

  It is necessary to prevent new pipes that pass through the ground from being damaged due to frictional resistance caused by substances existing in the ground. The damage of the new pipe can be reduced by increasing the passage cross-sectional space in the ground of the new pipe. Therefore, prior to the laying of the new pipe, the temporary pipe having a larger diameter than the new pipe is passed through the ground to secure a wide passage space for the new pipe, and the degree of damage of the temporary pipe is confirmed. The best mode is to take necessary measures to prevent damage to the body.

  There are cases in which new pipes to be laid in the ground require a larger diameter than existing pipes that already exist. There is also a case where a new pipe is laid in the sheath pipe. When pulling a new pipe having a larger diameter than a small existing pipe, the size of the rope drawn into the existing pipe is limited and becomes smaller, so a larger rope is necessary to prevent breakage. In order to make the cable that pulls the new pipe with a large diameter thicker, a temporary pipe is installed between the existing pipe and the new pipe, and measures are taken to make the cable thicker within the temporary pipe. The method that enables towing is the best mode.

  Since the present invention guarantees the quality of new pipes to be installed and replaces supply pipes at low cost, it has the effect of increasing the financial investment effect of replacement of lead pipes, etc. The possibility of being used as a new low-cost non-cutting method for the early realization of harm prevention is high.

Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic diagram showing the replacement of the supply pipe, and 1a is a pulling rope for pulling out the lead pipe. By pulling the rope, the pulling force of the rope is transmitted to the lead pipe 2a via the restraining member 7a, and the lead pipe 2a is rearward. The new pipe connected by the connecting member 8a is guided into the ground and moved. The outer surface of the new pipe is easily damaged by the friction of the soil in the ground.
FIG. 2 is a schematic diagram showing the replacement of the supply pipe, and 1a is a pulling rope for pulling out the lead pipe. By pulling the rope, the pulling force of the rope is transmitted to the lead pipe 2a via the restraining member 7a, and the lead pipe 2a is behind. The new pipe 3a to be connected is guided and moved into the ground. Since the outer surface of the newly installed pipe 3a is covered with a short cylindrical outer surface protective material 4a that is continuously used and has flexibility, no damage is caused without receiving friction from the soil in the ground. 5b shows a cross section 6b of the protective material and shows a side surface.
FIG. 3 is a schematic diagram showing the replacement of the supply pipe, and 1a is a pulling rope for pulling out the lead pipe. By pulling the rope, the pulling force of the rope is transmitted to the lead pipe 2a via the restraining member 7a, and the lead pipe 2a is behind. The new pipe 3a to be connected is guided and moved into the ground. Since the outer surface of the new pipe 2a is covered with a spiral outer surface protective material 5a having flexibility, no damage is caused without receiving friction from the soil in the ground. 5c shows a cross section 6c of the protective material and shows a side surface.
FIG. 4 is a schematic diagram showing the replacement of the supply pipe, and 1a is a pulling rope for pulling out the lead pipe. By pulling out the rope, the pulling force of the rope is transmitted to the lead pipe 2a via the restraining member 7a, and the lead pipe 2a is moved behind. The new pipe 3a to be connected is guided and moved into the ground. Since the outer surface of the new pipe 2a is covered with a bag-shaped outer surface protective material 6a having both ends open to flexibility, no damage is caused without receiving friction from the soil in the ground. 5d shows the cross section 6d of a protective material, and shows a side surface.
FIG. 5 is a schematic diagram showing the replacement of the supply pipe, and the cable 1a is a pulling cable for pulling out the lead pipe. By pulling the cable 1a, the pulling force of the cable is transmitted to the lead pipe 2a via the restraining member 7a. 2a The temporary pipe 9a having a larger diameter than the existing pipe 2a connected to the rear side is guided and moved into the ground. After pulling the cord 1a and moving the flexible temporary tube 9a to the position where the existing tube 2a is present, the temporary tube 9a is pulled to guide the new tube 3a having a smaller diameter than the temporary tube. Since the new pipe 3a passes through the space having a larger cross-sectional area than the new pipe cross-sectional area after the temporary pipe 9a passes, the new pipe 3a can be installed by passing through the ground without being damaged on the surface. 5e shows a cross section of the existing pipe 2a and the temporary pipe 9a, and 6d shows a new pipe cross section in the temporary pipe passage cross section.
FIG. 6 is a schematic diagram showing the replacement of the supply pipe, and the rope 1a is a tow rope for pulling out the lead pipe. By pulling the rope, the pulling force of the rope is transmitted to the lead pipe 2a via the restraining member 7a, and the lead pipe 2a. A temporary pipe 9a having a diameter larger than that of the existing pipe, in which the cable 1'a having a diameter larger than that of the cable 1a for pulling the existing pipe connected to the rear is installed, is guided and moved into the ground. After pulling the cord 1a and moving the flexible temporary tube 9a to the position where the existing tube 2a is present, the temporary tube 9a is pulled to lay a new pipe. The temporary pipe 9a is integrated with the cable 1'a by the restraining member 7'a so that the new pipe 3a can be pulled. 5f shows cross sections of the existing pipe 2a and the temporary pipe 9a, and 6f shows cross sections of the temporary pipe and the new pipe.

  It is a top view which shows the existing pipe and new pipe pulling condition in the Example of this invention.   It is a top view which shows the new pipe pulling condition which used the existing pipe and the short cylindrical protective material in multiple numbers continuously in the Example of this invention.   It is a top view which shows the existing pipe pulling condition using the existing pipe and the spiral-shaped protective material in the Example of this invention.   It is a top view which shows the existing pipe pulling condition using the existing pipe and the bag-shaped protective material of both ends open in the Example of this invention.   It is a top view which shows the new pipe laying condition by expansion in temporary pipe ground in the Example of this invention.   It is a top view which shows the new pipe pulling condition of the diameter larger than the existing pipe in the Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a Towing rope 1'a Towing rope 2a Existing lead pipe 3a New installation pipe 4a Short cylindrical protective material installation figure 5a Short cylindrical protective material sectional view 6a Short cylindrical protective material top view 4c Spiral protective material installation figure 5c Spiral protective material Cross-sectional view 6c Spiral protective material plan view 4d Bag-shaped protective material mounting view 5d Bag-shaped protective material cross-sectional view 6d Bag-shaped protective material plan view 7a Lead pipe restraining member 8a Connection member 8'a Connection member 6a Bag-shaped protective material 9c Temporary tube

Claims (2)

  When replacing the water supply and gas supply pipes by the non-opening method, the traction is completed by protecting and protecting the new pipe surface to prevent damage to the new pipe surface connected to the rear of the existing pipe. Towing and propulsion methods to remove protective materials according to   When replacing the water supply and gas supply pipes by the non-open cutting method, pull the temporary pipe with a larger diameter than the existing pipe in advance to reduce the friction resistance in the ground and reduce the damage to the new pipe. Alternatively, a traction method that precedes a temporary pipe that allows the traction of a new pipe with a large diameter by increasing the breaking force by thickening the cable in the temporary pipe.

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