JPH0241230A - Lining method for existing tube - Google Patents

Abstract

PURPOSE:To suppress a reduction in a fluid passing amount to increase the diameter by attaching or detaching a wire material having a high frictional coefficient with the side edge of stripes of a spiral tube between the side edges, then advancing the tube into the installed tube, and then extending the diameter until it is brought into contact with the installed tube. CONSTITUTION:A connecting rib 13 of a stripe 10 is engaged within the socket 15 of the stripe 10 wound spirally, and a heated metallic wire material 31 is continuously engaged to be integrally connected into a gap between the stepped part of the board 12 and the side end of the board 12. Accordingly, a spiral tube 10 manufactured by a tube manufacturing machine 20 is maintained in a predetermined diameter to smoothly advance in a sewage tube 81. When the advancing end of the tube 10' arrives at the end of the tube 81, it is fixed. The machine 20 is again driven, the material 31 is simultaneously sequentially separated, the stripes 10 are slid to each other, the tube 10' is sequentially enlarged in its diameter from the end, and brought into contact with the inner periphery of the tube 81. Thus, the fluid passing amount after lining is not reduced from that of the state before lining.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a lining method for existing pipes that is carried out when rehabilitating aging existing pipes. To be more detailed, 1
This invention relates to a method for lining an existing pipe, in which a helical pipe is manufactured by spirally winding a synthetic resin band, and the pipe is directly inserted into the existing pipe to line the existing pipe with the inserted helical pipe.

(Conventional technology) For buried pipes used for water supply and sewerage.

Metal pipes and Huyum pipes have been used since ancient times.

Such underground pipes become obsolete after long-term use, and there is a risk of water leakage due to cracking or corrosion. For this reason, recently, synthetic resin pipes are inserted into existing pipes such as aged buried pipes to line them.

One of the methods for lining existing pipes is a method of lining existing pipes with a spiral pipe manufactured by spirally winding a synthetic resin band. This method is disclosed in, for example, Japanese Patent Laid-Open No. 61-48690. The method disclosed in this publication is carried out by installing a pipe making machine capable of manufacturing a spiral pipe so as to face the end opening of the existing pipe. The pipe-making machine is sequentially supplied with synthetic resin strips whose side edges can engage with each other, and the pipe-making machine winds the strips in a helical manner, and by the winding. A helical tube is sequentially manufactured by engaging the side edges of adjacent strips. The manufactured spiral tubes are sequentially guided out of the tube making machine while rotating. Then, the spiral pipe led out from the pipe making machine is directly introduced into the existing pipe and is propelled while rotating within the existing pipe. When the spiral tube is inserted over substantially the entire area of the existing pipe, a backfilling material such as cement mortar is filled between the spiral tube and the existing pipe, and the spiral tube is fixed within the existing pipe. As a result, the existing pipe is lined with the spiral pipe.

As the band-shaped body serving as a spiral tube, a flexible synthetic resin such as polyvinyl chloride, polyethylene, polypropylene, etc. is used. The strip is usually 1.

A protruding strip is continuously provided in the longitudinal direction on one side edge, and a groove that can be engaged with the protruding strip is continuously provided on the other side edge in the longitudinal direction. When the strip is wound spirally, the protrusions and grooves on the side edges of adjacent strips fit together to form a helical tube.

(Problems to be Solved by the Invention) In such a lining method, a spiral pipe inserted into an existing pipe is propelled through the existing pipe while rotating once. For this reason, the outer peripheral surface of the spiral pipe is formed to have an outer diameter slightly smaller than the inner diameter of the existing pipe.

There is a risk that it will come into contact with the inner circumferential surface of the existing pipe, and if the two come into contact in this way, a large resistance will be applied to the spiral pipe. A tube-making machine that manufactures spiral tubes is supplied with strips one after another.
Since the pipe is made into a spiral tube by the pipe making machine and is led out from the pipe making machine one by one, if resistance is applied to the spiral pipe, the spiral pipe will not be propelled through the existing pipe and the strip will be removed from the pipe making machine. As the helical tube is sequentially fed out, the mutually fitted protrusions and grooves of the strip in the helical tube begin to slide, increasing the diameter of the helical tube. In this way, as the diameter of the helical tube increases, the helical tube cannot be propelled through the existing pipe.

For this reason, in conventional lining construction methods, in order to prevent almost the entire outer circumferential surface of the spiral tube from coming into contact with the inner circumferential surface of the existing pipe, the inner diameter of the helical tube is made sufficiently smaller than the inner circumferential surface of the existing pipe. It is being promoted. Therefore, in existing pipes lined using the conventional lining method, the part through which fluid flows (the inside of the spiral pipe) is significantly smaller than the original part through which fluid flows (inside the existing pipe), and the fluid flow after lining becomes smaller. The flow rate of the fluid is significantly lower than the flow rate of the fluid before lining.

Furthermore, if the difference in internal diameter between the existing pipe and the helical pipe is large (the helical pipe can move within the existing pipe, a backfilling material such as cement mortar is filled between the existing pipe and the helical pipe, and the helical pipe must be fixed to the existing pipe. Filling with such backfilling material requires a large amount of backfilling material, which is extremely time-consuming and impairs economic efficiency.

If the difference in the inner diameter of the spiral tube that is propelled through the existing pipe becomes large, there is a risk that the spiral tube will meander and will easily come into contact with the inner circumferential surface of the existing pipe. The inner circumferential surface of an old existing pipe is usually uneven, and when the outer circumferential surface of the existing pipe comes into contact with the inner circumferential surface of the existing pipe, high frictional resistance is applied, which may cause the spiral pipe to expand in diameter.

The present invention solves the above-mentioned conventional problems, and its purpose is to be able to propel a spiral pipe with a predetermined diameter into an existing pipe without expanding the diameter.

It is an object of the present invention to provide a method for lining an existing pipe in which the inner peripheral surface of the existing pipe can be lined with a spiral pipe having approximately the same diameter as the existing pipe by expanding the diameter of the spiral pipe.

(Means for Solving the Problems) The lining method for existing pipes of the present invention includes the steps of spirally winding a synthetic resin strip whose side edges can engage with each other, and The side edges of adjacent strips are engaged with each other, and a metal wire heated to the extent that it is fused to each side edge is continuously locked between each side edge. a step of manufacturing a helical tube, a step of sequentially inserting the manufactured helical tube into an existing pipe and propelling the inserted helical tube into the existing pipe, and fixing the tip of the helical tube to the existing pipe. and a step of separating the wire from between the strips with the tip of the helical tube fixed to the existing pipe, manufacturing a spiral tube in the same manner as the step of manufacturing the spiral tube, and installing the strip in the existing tube. The step of expanding the diameter of the helical tube by causing the side edges of the strips that are engaged with each other to slide from the detached portion of the wire of the helical tube in a spiral manner into the tube. Tenari.

This achieves the above objective.

The lining method for existing pipes of the present invention involves the process of spirally winding synthetic resin strips whose side edges can engage with each other, and the process of winding the sides of adjacent strips. A process of manufacturing a helical tube by engaging the edges and continuously locking a wire rod processed so that the outer peripheral surface has high frictional resistance between each side edge; a step of sequentially inserting the helical tube into the existing pipe and propelling the inserted helical tube into the existing pipe; a step of fixing the tip of the helical tube to the existing pipe; and a step of fixing the tip of the helical tube to the existing pipe. In a fixed state,
The wire is separated from between the strips, a spiral tube is manufactured in the same manner as the step of manufacturing the spiral tube, and the strip is spirally propelled into the existing pipe, thereby removing the wire from the spiral tube. By sliding the side edges of the strips that are engaged with each other.

The method includes the step of expanding the diameter of the helical tube, thereby achieving the above object.

The lining method for existing pipes of the present invention involves the process of spirally winding synthetic resin strips whose side edges can engage with each other, and the process of winding the sides of adjacent strips. The edges are engaged with each other, and a wire rod whose outer peripheral surface is provided with a substance that increases frictional resistance with each side edge is continuously locked between the side edges to form a spiral tube. The process of manufacturing;
A step of sequentially inserting the manufactured spiral tube into an existing pipe and propelling the inserted spiral tube into the existing pipe, a step of fixing the tip of the spiral tube to the existing tube, and a step of fixing the tip of the spiral tube to the existing tube. With the wire rod fixed to The method includes the step of expanding the diameter of the helical tube by sliding the side edges of the strips that are engaged with each other from the detached portion of the wire, thereby achieving the above object.

(Example) The present invention will be described below with reference to Examples.

There are nine examples of the existing pipe lining method of the present invention.

As shown in FIG. 2, this is carried out when rehabilitating an existing concrete sewer pipe 81. In the method of the present invention, first, a strip 10 made of synthetic resin is made into a spiral tube 10'' using a tube making machine 20. The pipe making machine 20 is installed in a manhole 82 to which one end of a single water pipe 81 is connected, and the made spiral pipes 10'' are sequentially inserted into the sewer pipe 81. The tube is 10゛.

The outer diameter is made sufficiently smaller than the inner diameter of the drain pipe ``81'' so as not to contact the inner circumferential surface of the drain pipe 81.

The strip 10 used in the method of the present invention has a cross-sectional shape as shown in FIG. The strip 10 is made of polyvinyl chloride, polyethylene, or polypropylene.

It is molded from polycarbonate, polyester, or a resin made by reinforcing these resins with glass fiber.

The strip-shaped body 10 has a strip-shaped substrate 12 . The substrate 1
At one side edge of the substrate 12, an engagement rib 13 protruding from one surface of the substrate 12 is provided continuously in the longitudinal direction. The distal end portion of the engaging rib 13 has a solid cylindrical shape that is continuous in the longitudinal direction.

The other side edge of the substrate 12 has an engaging portion 14 located on the protruding direction side of the engaging rib 13 by the thickness of the substrate 12. A substantially inverted U-shaped socket 15 protruding in the same direction as the socket 15 is successively provided. The socket 15 has a hollow portion 15a inside thereof that is slightly larger than the tip of the engagement rib 13.

The socket 15 is continuous with the substrate 12 by stepping down by the thickness of the base Fi12.

A fitting rib 16 is provided on the side of the engaging rib 13 and projects from the substrate 12 in the direction in which the engaging rib 13 projects. The fitting rib 16 has a T-shaped cross section and has an upright portion 16a that protrudes upright by the thickness of the locking portion 14, and a flange portion 16b provided at the tip of the upright portion 16a. . Then, when the engagement rib 13 is fitted into the hollow portion 15a of the socket 15.

The locking portion 14 continuous with the socket 15 is connected to the fitting rib 16.
is fitted between the flange portion 16b and the substrate 12.

In that case, the side edge of the substrate 12 on which the engagement rib 13 is provided is engaged with the stepped portion of the side edge of the substrate 12 on which the socket 15 is provided. A slight gap is formed between the stepped part of the board 12 and the end of the side edge of the board 12 fitted into that part.

A wire rod, which will be described later, is engaged within the gap.

Between the fitting rib 16 and the socket 15, there are a plurality of reinforcing ribs 17.1 that protrude in the same direction as the fitting rib 16. , . . . are provided at predetermined intervals. Each reinforcing rib 17 has a T-shaped cross section and has an upright portion 17a that projects upright from the substrate 12 and a flange portion 17b provided at the tip of the upright portion 17a. The upright portion 17a of each reinforcing rib 17 is sufficiently longer than the upright portion 16 of the fitting rib 16.

Such a strip lO is made into a spiral pipe 10' by a pipe making machine 20 installed in the manhole 82. Pipe making machine 2
0 is a pipe-making roller 21 disposed on the cylindrical peripheral surface with a predetermined helical angle to guide the belt-shaped body 10 introduced into the pipe-making 820.
The belt-shaped body 10 is forcibly bent to wind it in a spiral shape. As shown in FIG. 4, the engaging rib 13 of the strip 10 newly introduced into the pipe making machine 20 is inserted into the hollow part 15a of the socket 15 of the strip 10 wound spirally.
are fitted, and the side edges of adjacent strips 10 are engaged with each other. At this time, the locking portion 14 continuous to the socket 15 is locked to the flange portion 16b of the fitting rib 16.

In the lining construction method of the present invention, = pipe machine 20
into the socket 5 of the strip 10 spirally wound at
Almost at the same time as the engaging ribs 13 of the belt-shaped body 10 newly fed into the pipe making machine 20 are fitted, the stepped portion of the substrate 12 and the side end of the substrate 12 fitted to the stepped portion are fitted. A metallic wire 31 heated to the extent that it is fused to the substrate 12 is continuously inserted into the gap between the substrate 12 and the substrate 12 . The wire rod 31 is made of hard metal with no elasticity, and has an outer diameter slightly larger than the gap in which it is engaged. Further, the heating temperature is preferably about 190° C. when the strip 10 is made of polyvinyl chloride. In this way, the wire 31
When the wire 31 is engaged in the gap, the wire 31 is connected to the substrate 12.
is loosely fused to each side edge of the line +A'31
and each side edge of the substrate 12 are integrally engaged with each other without slipping. Therefore, the spiral pipe 10 manufactured by the pipe making machine 20
'' is propelled through the sewer pipe 81 while being maintained at a predetermined diameter without expanding.

In this way, when the spiral pipe 10' in which the side edges of the adjacent strips are firmly engaged is manufactured, the spiral pipe 10' is directly inserted into the sewer pipe 81 from the pipe making machine 20. inserted into. Then, the spiral pipe 10' is propelled in the axial direction while rotating once inside the sewer pipe 81. At this time, spiral tube 1
Since the outer diameter of 0' is sufficiently smaller than the inner diameter of the sewer pipe 81, the spiral pipe lO' hardly contacts the inner circumferential surface of the sewer pipe 81 except for its bottom, and moves smoothly inside the sewer pipe 81. do. Furthermore, even if the spiral pipe 10' comes into contact with the inner peripheral surface of the sewer pipe 81, since its diameter is small, the resistance that the spiral pipe lO' receives from the inner peripheral surface of the sewer pipe 81 is small, and furthermore, the spiral pipe 10' Since the side edges of the mutually adjacent strips are loosely fused to the wire 31, even if high frictional resistance acts between the inner peripheral surface of the sewer pipe 81 and the spiral pipe 10', , the spiral pipe 10' is smoothly propelled through the sewer pipe 81 without expanding in diameter. When the tip of the spiral pipe 10'' in the propulsion direction reaches the end of the sewer pipe 81,
As shown in FIG. 2, the manufacture of the 10° spiral pipe by the pipe making machine 20 is temporarily stopped, and the tip of the spiral pipe 10° is connected to the sewer pipe 8.
It is fixed by driving an anchor or the like into the end of the 9.

In this state, the pipe making machine 20 is driven again.

The strip 10 is fed to the pipe making machine 20, and the spiral pipe 10' attempts to be propelled through the sewer pipe 81 while rotating again.

At this time, at the same time as the pipe making machine 20 is driven, the wire rods 31 located between the fitted side edges of the mutually adjacent strips of the helical pipe IO" are moved from between the fixed side edges of the helical pipe 10". Remove them one by one starting from the left side. Wire rod 31 and spiral tube 10°
Since the strip 10 is loosely fused to each side edge of the substrate 12, the wire 31 can be easily separated from each side edge. When the wire rod 31 is removed, the spiral tube 10
The adjacent strips at ' are in a state where they can slide relative to each other.

Then, by driving the pipe making machine 20, the helical pipe 1 is made into a pipe.
When the strips 10 are sequentially fed to the helical tube 10'', as shown in FIG. body 1
0 slide against each other, and the helical tube 10'.

With the distal end of the engagement rib 13 fitted into the hollow portion 15a of the socket 15, the diameter is expanded sequentially from the fixed distal end side. The diameter-expanded spiral pipe 10' is brought into close contact with the inner circumferential surface of the sewer pipe 81.

At this time, the mutually adjacent strips 10 slide,
By vibrating the portion of the spiral pipe 10' whose diameter is expanded, the diameter of the spiral pipe 10' can be reliably expanded until it comes into close contact with the inner circumferential surface of the sewer pipe 81.

Furthermore, if a plurality of wire rods 31 are arranged between the side edges of the strip IO, the diameter of the helical tube lO° can be more reliably prevented from expanding.

The belt-shaped body used in the lining method of the present invention is as follows.

As shown in FIG. 5, an engagement rib 13'' may be provided at the end of one side of the substrate 12, projecting upright from the substrate 12.This engagement rib 13' has a solid circular cross-section at its tip. On the other side edge of the strip 11, there is an engaging rib 13'' corresponding to the thickness of the substrate 12, similar to the strip in the embodiment described above. Engagement part 14 located in the protruding direction
', and a socket 15'' connected to the engaging portion 14''.
and is provided. The tip of the groove 5' is a hollow portion into which the tip of the engagement rib 13' can be loosely fitted. A socket 1 facing the base end of the engagement rib 13'
A recessed hole 12a into which the wire 31 is engaged is provided at the base end of the wire 5'. The other configurations are the same as those of the band-shaped body IO.

The wire 31 to be engaged between the side edges of the mutually adjacent strips in the helical tube is a wire rod 31 that is connected to each side edge without heating to the extent that each side edge is fused. For example, a material whose outer peripheral surface is knurled may be used so as to have high frictional resistance. Processing of the outer peripheral surface of the wire rod 31 is as follows.

This is done using a knurling machine. in this case.

The wire rod 31 is not limited to metal, and may be made of synthetic resin.

When using a metal wire whose outer peripheral surface has been knurled, it may be heated to such an extent that it is loosely fused to each side edge of the strip, as in the above embodiment. Further, the number of wire rods is not limited to one, but if a plurality of wire rods are engaged between each side edge of the band-shaped body, each side edge and the wire are more firmly engaged.

The wire 31 may have a material provided on its outer peripheral surface that increases the frictional resistance with each side edge. Examples of such a wire 31 include a metal wire such as a wire coated with a vinyl-based soft material or a rubber-based soft material, a metal wire such as a wire coated with a rubber-based adhesive material on the outer peripheral surface, or , a metal wire such as wire coated with instant adhesive on the outer peripheral surface at appropriate intervals in the axial direction is used. In this case as well, a configuration may be adopted in which a plurality of wire rods are positioned between each side edge portion of the band-shaped body.

(Effects of the Invention) In this way, the existing pipe lining method of the present invention locks wire rods that have a high frictional resistance between each side edge of the strip in a spiral pipe. Therefore, even if a small-diameter spiral pipe comes into contact with an existing pipe, the diameter will not expand, and the spiral pipe will be reliably propelled through the existing pipe. As a result, even when the existing pipe is submerged or has unevenness on its inner circumferential surface, the work of propelling the spiral pipe into the existing pipe can be carried out efficiently.

Further, the wire can be easily removed from between the side edges of the strip, and the spiral tube is enlarged in diameter so as to come into close contact with the existing pipe to line the existing pipe.

As a result, the amount of fluid flowing through the existing pipe remains almost the same as before lining, and the amount of backfilling material between the spiral pipe and the existing pipe can also be reduced.

4. Figures 1 and 2 are cross-sectional views showing the implementation steps of the lining method of the present invention, Figure 3 is a cross-sectional view of the strip, and Figure 4 is a cross-sectional view of the lining between the side edges. FIG. 5 is a sectional view showing another example of the band-like body.

10... Band-shaped body, 10゛... Spiral tube, 12...
Board, 13... Engagement lip, 15... Socket 20
...Pipe making machine, 31...Wire rod.

that's all

Claims (1)

[Claims] 1. A step of spirally winding a synthetic resin band whose side edges can engage with each other; and a step of spirally winding the side edges of the band that are adjacent to each other as a result of the winding. manufacturing a spiral tube by engaging them with each other and continuously locking a metal wire heated to the extent that it fuses with each side edge; A step of sequentially inserting the manufactured spiral tube into an existing pipe and propelling the inserted spiral tube into the existing pipe, a step of fixing the tip of the spiral tube to the existing tube, and a step of fixing the tip of the spiral tube to the existing tube. The wire rod is separated from between the belt-like bodies while the wire is fixed in place, and the spiral pipe is manufactured in the same manner as the process of manufacturing the spiral pipe, and the belt-like body is spirally propelled into the existing pipe. A method for lining an existing pipe, comprising the step of expanding the diameter of the helical pipe by sliding the side edges of mutually engaged band-like bodies from the separated portion of the wire rod of the pipe. 2. A process of spirally winding a synthetic resin band whose side edges can engage with each other, and by the winding, the side edges of adjacent band bodies are engaged with each other. A process of manufacturing a helical tube by continuously locking a wire rod processed so that the outer peripheral surface has high frictional resistance between each side edge, and inserting the manufactured helical tube into the existing pipe. A step of sequentially inserting and propelling the inserted spiral tube into the existing pipe, a step of fixing the tip of the spiral tube to the existing tube, and a step of fixing the tip of the spiral tube to the existing tube, and then inserting the wire into the existing tube. By separating the wire rods from between the strips, manufacturing a spiral tube in the same manner as the step of manufacturing the spiral tube, and propelling the strips into the existing pipe in a spiral manner, the wire rods are separated from each other from the separated portion of the spiral tube. A method for lining an existing pipe, comprising: expanding the diameter of the helical pipe by sliding the side edges of the strips engaged with each other. 3. A step of spirally winding a synthetic resin strip whose side edges can engage with each other, and through the winding, the side edges of adjacent strips are engaged with each other. , a step of manufacturing a helical tube by continuously locking, between each side edge thereof, a wire rod whose outer peripheral surface is provided with a substance that increases frictional resistance with each side edge; A step of sequentially inserting a spiral tube into an existing pipe and propelling the inserted spiral tube into the existing pipe, a step of fixing the tip of the spiral tube to the existing tube, and a step of fixing the tip of the spiral tube to the existing tube. In this state, the wire rod is separated from between the strips, a spiral tube is manufactured in the same manner as the step of manufacturing the spiral tube, and the strip is spirally propelled into the existing pipe, thereby removing the wire rod from between the strips. A method for lining an existing pipe, comprising the step of expanding the diameter of the helical pipe by sliding the side edges of the strips that are mutually engaged from the separated portion of the wire rod.