JPH0524113A - Method for forming pipe in connection with expansion and destruction of disused pipe - Google Patents

Abstract

PURPOSE:To eliminate the work excavating a trough to embed a pipe therein or drawing the pipe into a horizontal propelling hole when an old disused pipe such as a gas pipe or a water pipe is renewed and to directly form a new pipe to the propelling hole formed after the expansion and destruction of the disused pipe in the ground on the working spot. CONSTITUTION:Working holes 13 are excavated at both ends of a disused pipe 1 to be renewed and the disused pipe 1 is expanded and destructed within the working holes 13 by an expanding and destructing machine 3 and, at the same time, the propelling hole 2 formed after expansion and destruction is filled with a resin 23 and the resin 23 is sent by controlled air pressure to form a lining film to the inner wall of the propelling hole 2. This process is repeated. A seal tube is reversed or expanded by air pressure over the total length of the inner wall of the propelling hole 2 and bonded to the surface of the inner wall of the propelling hole 2 by an adhesive applied to the outer peripheral surface of the seal tube to form a seamless pipe by the seal tube.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for laying a gas pipe, a water pipe, etc. in the ground. The present invention relates to a method of immediately constructing a new pipe in the propulsion hole of the mark, and renewing the buried pipe without pulling in and inserting a pipe such as a steel pipe and a vinyl chloride pipe and excavating the propulsion hole.

[0002]

2. Description of the Related Art Conventionally, when replacing old abandoned pipes laid underground such as gas pipes and water pipes with new pipes, excavating a groove from the ground from the start point to the end point of the abandoned pipe, or replacing the pipe, Alternatively, work holes are excavated at the start and end positions of the abolished pipe, the abolished pipe is pulled out while cutting the abolished pipe in the work hole, and a new pipe is inserted into the hole called a propulsion hole or a flexible polyethylene pipe. A new pipe was laid by pulling in the sex pipe and inserting it.

[0003]

Therefore, in the former method, the excavation area becomes enormous, and much labor and cost are required for excavation and restoration, and the work itself is impossible depending on the structure on the ground. Yes, the road was closed for a long time, which was an obstacle to traffic. In the latter method, since the abolished pipe and the new pipe have the same diameter, it is necessary to excavate and expand the propulsion hole, which requires a large amount of tools and equipment, and the work is complicated and requires skill. Was required. That is, in order to insert a pipe horizontally from a narrow working hole, the length of each pipe is limited, and therefore short pipes must be connected one after another to form a long pipe. Therefore, there has been a problem that a technique is required for connecting the pipes and leakage from the connecting portion is likely to occur. In addition, in the method of retracting and inserting a flexible tube made of polyethylene,
When the diameter of the tube was 100 mm or more, it was difficult to pull it in. Conventionally, a method of inserting a new small-diameter pipe into the inside of an abolished pipe called a pipe-in-pipe system is known.
This naturally has a fatal drawback that the required flow rate cannot be obtained due to the reduction of the diameter, and again there is a problem that the work hole needs to be as wide as the length of the new pipe to be drawn in, and it becomes large. .

Further, conventionally, there has been known a method of expanding and destroying an abolished pipe by using a expanding and breaking machine, but at the same time pulling in a new pipe. However, it takes time and effort to connect the new pipe and the working hole becomes large. There was a problem (JP-A-57-12078)
No. 9).

The present invention has been made in view of the above problems of the prior art.
Eliminate the excavation work for burying the new pipe, the opening and excavation work of the propulsion hole, and the pulling-in work.
The diameter of the abolished pipe is directly formed in the expansion hole of the destroyed pipe, which reduces the amount of excavation and the labor of work, and effectively utilizes the fragments of the abolished pipe whose diameter has been destroyed to reinforce the new pipe. The purpose of the present invention is to provide a method of laying a new pipe that does not leak by eliminating the pipe connection portion.

[0006]

In order to achieve the above object, the present invention is to drill working holes at both ends of an abolished pipe to be renewed, and insert a diameter expansion breaking machine into the abandoned pipe in the working hole. Expand and destroy the abolished pipe, inject a specified amount of liquid resin into the hole from the opening of the propulsion hole in the trace of the abolished pipe, and pressurize the fluid before and after the resin plug. Alternatively, a step of forming a lining film with a required film thickness on the inner wall of the hole is extended by repeating the process of applying a pressure difference due to the suction airflow to allow the resin plug to flow in the hole, thereby lining the resin over the entire length of the inner wall of the hole. It is characterized by forming a tube by a membrane.

Further, according to the present invention, working holes are excavated at both ends of the abolished pipe to be renewed, and a diameter-expanding destruction machine is inserted into the abolished pipe in the working hole to expand and abolish the abolished pipe, thereby expanding the abolished pipe. One end of a flexible seal tube is fixed to the opening of the propulsion hole of the diameter destruction trace, and while the seal tube is inverted and inserted into the hole by air pressure, the outer surface of the inverted tube is adhered to the inner wall of the hole with a coating adhesive. It is characterized in that a pipe is formed by performing a lining process and forming a seal tube that is reverse-bonded to the inner wall of the hole over the entire length of the hole of the propulsion hole.

Further, according to the present invention, working holes are excavated at both ends of the abolished pipe to be renewed, and a diameter expansion breaking machine is inserted into the abandoned pipe in the working hole to expand and abolish the abolished pipe to expand the abolished pipe. One end of the seal tube is fixed to the opening of the propulsion hole of the diameter destruction trace, and after inserting the seal tube into the propulsion hole, the tube is expanded by air pressure and the outer surface of the tube is adhered to the inner wall of the propulsion hole with a coating adhesive. The pipe is formed by a sealing tube that is subjected to a lining step to be expanded and adhered to the inner wall of the hole over the entire length of the hole.

[0009]

According to the present invention, with the above-described structure, a resin lining film can be formed on the inner wall of the propulsion hole immediately after the diameter of the abolished pipe has been expanded and broken without having to open and cut the propulsion hole. The membrane cures after a predetermined time, determined by the molecular weight of the macromolecules that make up the resin, to form a new tube with the debris of the abolished tube. The fragments of the disused pipe are hardened by resin on the outer peripheral surface of the new pipe and serve as a reinforcing material. When a resin having an appropriate viscosity of about 300,000 to 600,000 cps is used for this method, the lining work time for 50 m is about 60 minutes, the curing time is about 2 days, and the applicable pipe diameter is 40 to 150 mm. The resin lining film cures without being affected by moisture in the ground, and does not shrink due to curing. Therefore, the resin lining film follows the shape of the inner wall of the perfect circular propulsion hole after passing through the expansion and destruction machine. A cylindrical tube can be formed. Further, by repeating the step of forming the lining film, it is possible to form a tube having an arbitrary length, and even if the propulsion hole is bent, the tube can be formed without any trouble.

Further, one end of a seal tube having the same diameter as the diameter of the propulsion hole when expanded is fixed to the end surface of the propulsion hole after the expansion and destruction of the abolished pipe, and the tube is abolished. The pipe is formed by the tube over the entire extension of the propulsion hole by adhering to the inner wall surface of the propulsion hole with the adhesive applied to the outer peripheral surface of the reversed tube while reversing by pneumatic pressure in conjunction with the diameter expansion and destruction process of To do. Therefore, the formed tube has good airtightness, and since the tube is moved in the reverse direction by the air pressure, it is not necessary to insert the tube into the propulsion hole, and the construction time can be shortened.

Further, after the diameter of the abolished pipe is expanded and destroyed, the seal tube is inserted in advance into the propulsion hole formed by the expansion and destruction, one end of the tube is fixed to the end surface of the propulsion hole, and the air pressure is pumped to the inside of the tube. Then, while expanding and expanding the tube, it is adhered to the inner wall of the propulsion hole with an adhesive applied to the outer periphery of the tube, and the tube is formed over the entire extension of the inner wall of the propulsion hole. The formed tube has good airtightness, is hardly affected by the unevenness of the inner wall of the propulsion hole, and can be used immediately as a tube. Moreover, the fragments of the abolished pipe caused by the diameter expansion failure protect the new pipe formed in the seal tube, and a new pipe with a high roundness is completed.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an example of a diameter-expanding destruction machine 3 used for diameter-expanding destruction of an abolished pipe 1 performed in implementing the present invention. The diametrical expansion destruction machine 3 is provided with a cylinder 7 in a main body 4, and in the cylinder 7, a piston 5 and a rod 6 integral with the piston 5 are provided.
There is.

Further, several expanding blades 8 are rotatably supported by a fulcrum 9 at symmetrical positions at the tip of the rod 6 of the diametrical destruction and destruction machine 3, as shown in FIG. Touches the tip of. Further, the piston 5 slides left and right in FIG. 1 by the air holes 10 and 10. Further, a pulling rope 15 is connected to the tip together with the hose 11. When the piston 5 and the rod 6 are moved back and forth by the above-described structure, the expansion-expanding breaker 3 opens and closes the expanding blade 8 to break the abolished pipe 1 as shown in FIG. The diameter is enlarged on the outer peripheral surface of the main body 4 by the pulling by 15. The diameter expanding and breaking machine 3 itself may be of any known type.

FIG. 3 is a sectional view showing the first embodiment of the present invention, in which working holes 13 and 13 are drilled at both end positions of the disused pipe 1,
Cut the abandoned pipe 1 and insert the diametrical expansion destruction machine 3 into the winch 2
5, pulled by the rope 15 and the piston 5
Is driven by the compressor 17 and the valve device 26.
On the other hand, an abutting plate 22 is provided on the end surface of the propelling hole 2 after the diameter expansion and destruction, and a substantially L-shaped tube end jig 21 is inserted into the propelling hole 2 and fixed. The resin injection pipe 20 is fixed to the other end of the pipe end jig 21. In the resin injection pipe 20,
The air pressurized to a predetermined pressure from the compressor 7 through the pressure regulator 18 having a built-in pressure regulator is converted into the pressure hose 1.
Sent via 9.

A fixed amount of liquid epoxy resin is enclosed in the resin injection pipe 20, and the pipe end jig 2 is compressed by air pressure.
It is pushed out into the propulsion hole 2 through 0. As shown in FIG. 4A, the resin 23 forms a mass called a resin plug and advances in the propulsion hole 2 to form a lining film 28 on the inner wall of the propulsion hole 2. When the resin 23 is no longer consumed as the lining film 28, blow-through occurs as shown in FIG. 4B, and all the resin in the resin injection pipe 20 becomes the lining film 28. The resin injection pipe 20 is detachable from the hose 19 and the pipe end jig 21 with one touch, and when it becomes empty, it is replaced with another one filled with resin in advance. By repeating this procedure, the lining film 28 is formed over the entire length of the propulsion hole 2. At this time, when the resin 23 is made to chase immediately after the expanding smashing device 3 in conjunction with the expanding smashing work of the abolished pipe 1 by the expanding smashing device 3, the resin will be broken before the inner wall of the propulsion hole 2 collapses. 23 is lined and the roundness is good, which is convenient.

In the above work, the epoxy resin having a high viscosity of about 300,000 to 600,000 cps is suitable, and the air pressure is about 1 kg (gauge pressure) per square cm. This air pressure is obtained by controlling the high pressure air in the compressor 17 with a pressure regulator in the pressure regulator 18. If the air pressure is high, the traveling speed of the resin 23 becomes faster and the lining film 28 becomes thicker. If the air pressure is low, the resin 23 becomes thicker.
And the lining film 28 becomes thinner.
Therefore, the thickness of the lining film 28, that is, the thickness of the new pipe can be arbitrarily set by adjusting the air pressure. The fragments of the abolished pipe 1 whose diameter has been expanded and broken are adhered to each other by the lining film 28 as shown in FIG. 5, and serve as a reinforcing material for the new pipe. In the case of the above-mentioned thing, resin 23 hardens and becomes a buried pipe in about 2 days after construction. During this time, if necessary, if about 0.2 to 1 kg of pressurized air (gauge pressure) per square cm is enclosed in the new tube, the tube is less likely to be distorted.

FIG. 6 is a sectional view showing a second embodiment of the present invention, in which only the vicinity of the pipe end jig 32 is shown enlarged. In the second embodiment, the pipe end jig 32 is divided into a straight pipe portion 35 and a curved pipe portion 33 as shown in FIG. 7, and they can be fixed to each other by flanges 34 and 36. The curved tube portion 33 has a rectangular tube hole 38 through which the seal tube 31 passes.
Is provided. The diameter of the seal tube 31 is the same as the diameter of the propulsion hole 2 when expanded into a cylindrical shape,
It is made of a plastic film and has flexibility.
Then, it is flatly folded, the adhesive 27 is applied to the folded inner surface side, and the tube roll 30 is rotatably wound and supported. This seal tube 31
Passes through the tube hole 38, and its tip is held between the flanges 34 and 36 of the tube end jig 32 by expanding.

In this state, the air pressurized from the compressor 17 through the pressure regulator 18 is supplied to the hose 19 and the joint portion 3.
6, the seal tube 31 is unwound from the tube roll 30 and advances in the propulsion hole 2 while being reversed so as to peel off the portion where the adhesive 27 is applied, so that the seal tube 31 has a cylindrical shape. Adhesive 2 is the part that is expanded to
7 is attached to the inner wall surface of the propulsion hole 2 to form a tube. And finally, all the tubes 31 are inverted,
A new pipe is created in the propulsion hole 2. In the case of this embodiment, the tube 31 is adhered to the fragment of the abolished pipe 1 inside the propulsion hole 2 that has been expanded and broken to be reinforced. In addition, the new pipe formed by the seal tube 31 may be reinforced by performing the same lining construction as in the first embodiment. The inside of the tube hole 38 of the curved pipe portion 33 is shown in FIG.
A check valve 39 made of silicone rubber is fixed as shown in FIG. This check valve 39 is provided by one or several to prevent loss of air pressure. The silicon rubber is used to prevent the adhesive 27 from adhering.

8 and 9 show a third embodiment of the present invention, FIG. 8 is an overall side view, and FIG. 9 is an explanatory view of the principle of the reverse sealing method. In the third embodiment, the working holes 13,
The pipe end jigs 40, 40 are connected to the open ends of the propulsion holes 2 in the pipe 13, and one of the pipe end jigs 40 receives an air pressure from a compressor 41 (or an air cylinder). The metal fitting 44 is connected to the other pipe end jig 4
A take-up machine 46 is connected to 0 via a pinch fitting 45. A tube roll 47 is rotatably supported in the reversing machine 42, and the diameter of the seal tube 48 wound as the tube roll 47 becomes the same as the diameter of the propulsion hole 2 when expanded into a cylindrical shape. It is made of a plastic film and has flexibility. Then, the belt 49 is folded flat, and an adhesive is applied to the folded inner surface side, and a belt 49 is provided inside the folded core portion, and the belt 49 is wound by a winder 46. The tube roll 47 is rewound, the tube 48 is reversed, and the air pressure from the compressor 41 presses and adheres to the inner peripheral surface of the propulsion hole 2 to form a new tube. The new pipe formed by the seal tube 48 may be subjected to the same lining construction as in the first embodiment.

FIG. 9 is a sectional view showing a fourth embodiment of the present invention, in which only the vicinity of the pipe end jig 50 is shown enlarged. In the fourth embodiment, the pipe end jig 50 is divided into a straight pipe portion 52 and a curved pipe portion 51, which are fixed to each other by flanges and integrated with each other. 5
2 is inserted. In the fourth embodiment, the seal tube 31 is preliminarily pulled and inserted by a rope or the like into the propulsion hole 2 formed in the abolished pipe 1 after the diameter expansion and destruction, and one end portion of the pipe end jig 50 is It is sandwiched and fixed between the straight pipe portion 52 and the flange of the curved pipe portion 51. Then, when the air pressurized from the compressor 17 through the pressure regulator 18 is press-fitted through the hose 19 and the joint portion 37, the seal tube 31 advances while expanding from the inside as shown in the figure, and expands into a cylindrical shape. Adhesive 27 is used to sequentially press the driven parts 2
Adhered to the inner wall surface of the to form a tube. The pipe formed by the seal tube 31 may be reinforced by performing the same lining work as in the first embodiment. In the case of this embodiment as well, as in the case of the second embodiment, the tube 31 is bonded and reinforced to the fragment of which the diameter of the abolished pipe 1 inside the propulsion hole 2 has been expanded and destroyed.

[0021]

As described above in detail, the present invention does not require the use of ready-made pipes such as steel pipes and vinyl chloride pipes when renewing laid pipes in which gas pipes, water pipes, etc. are buried in the ground. Since it is possible to lay pipes on site, it is not necessary to transport long pipes, and it is not necessary to excavate a slot for burying pipes. Therefore, the construction on the ground does not make the work impossible and the road traffic is not obstructed, and the amount of excavation is significantly reduced. In addition, compared with the method of pulling in the pipe, the hole after expansion and destruction of the abandoned pipe is used, so there is no need to excavate the propulsion hole, and the work is simple with few tools and equipment. In particular, the size of the working hole is much smaller than that of the conventional method because there is no long tube in and out.

In addition, since the pipe made underground has no seam and does not leak, the length is not limited, and pipes of the same diameter as the abolished pipe can be made. A new pipe with the same flow rate can be obtained. Further, the wall thickness of the tube can be easily changed by adjusting the air pressure. The outer wall of the new pipe produced is reinforced by the fragments of the abandoned pipe whose diameter has been expanded and destroyed, and is strong.
Furthermore, in the case of pipe making with a seal tube,
A pipe with good confidentiality can be obtained with easy pipe making.
Moreover, it can be used immediately after pipe making. The time required for lining with resin is about 60 minutes per 50 m, and since it can be done at the same time as the diameter expansion destruction of the abolished pipe, the work time is shorter and the construction cost is lower than the conventional method.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of a diameter expansion destruction machine.

FIG. 2 is a view on arrow AA of FIG.

FIG. 3 is a cross-sectional view showing a first embodiment of the present invention.

FIG. 4 is an explanatory diagram showing formation of a lining film.

FIG. 5 is a sectional view of a new pipe.

FIG. 6 is a sectional view showing a second embodiment of the present invention.

FIG. 7 is a perspective view of a tube end jig.

FIG. 8 is a sectional view of a tube hole.

FIG. 9 is a side view showing a third embodiment of the present invention.

FIG. 10 is an explanatory view of the principle of the reverse sealing method of the third embodiment.

FIG. 11 is a sectional view showing a fourth embodiment of the present invention.

[Explanation of symbols]

1 abolition pipe 2 propulsion holes 3 Expanding destruction machine 8 Expanding blade 13 working holes 17,41 compressor 18 Pressure regulator 20 Resin injection tube 21, 32, 40 Tube end jig 23 Resin 27 Adhesive 28 Lining membrane 30,47 tube roll 31,48 Seal tube 38 tube holes 39 Check valve 42 Reversing machine 43 Guide hose 44 Reversing bracket 45 pinch bracket 46 Winder 49 belt

Claims (3)

[Claims] 1. A work hole is drilled at both ends of an abolished pipe to be renewed, and a diameter expansion destruction machine is inserted into the abolished pipe in the work hole to expand and destroy the abandoned pipe, and a trace of a diameter expansion fracture of the abandoned pipe. A specified amount of liquid resin is injected and filled into the hole from the opening of the propulsion hole, and a pressure difference due to the pressurized fluid or the suction airflow is applied between the front and rear of the resin plug, whereby the resin plug The process of extending and forming a lining film of a required film thickness on the inner wall of the hole is repeated while allowing the fluid to flow in the inner wall of the hole, and a pipe made of a resin lining film is formed over the entire length of the inner wall of the hole to expand the abolished pipe. Pipe production method linked with diameter destruction. 2. A work hole is drilled at both ends of the abolished pipe to be renewed, and a diameter-expanding destruction machine is inserted into the abandoned pipe in the work hole to expand and destroy the abolished pipe, and a trace of a diameter-expanded fracture of the abandoned pipe. A lining step in which one end of a flexible seal tube is fixed to the opening of the propulsion hole, and the outer surface of the reversed tube is adhered to the inner wall of the hole with a coating adhesive while the seal tube is inverted and inserted into the hole by air pressure. A pipe-expansion interlocking method for expanding and destroying an abolished pipe, characterized in that the pipe is formed by a seal tube that is reverse-bonded to the inner wall of the hole over the entire length of the propulsion hole. 3. A drilling hole is drilled at both ends of the abolished pipe to be renewed, and a diameter-expanding destruction machine is inserted into the abolished pipe in the work hole to expand and destroy the abandoned pipe, and a trace of a diameter-expanded fracture of the abandoned pipe. A lining step in which one end of the seal tube is fixed to the opening of the propulsion hole, the seal tube is inserted into the propulsion hole, and then the tube is expanded by air pressure to adhere the outer surface of the tube to the inner wall of the propulsion hole with a coating adhesive. And a pipe forming method by expanding and destroying an abolished pipe, characterized in that the pipe is formed by a seal tube that is expanded and adhered to the inner wall of the hole over the entire length of the propulsion hole.