JPH0725137B2 - Existing pipe lining method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a lining method for an existing pipe, which is carried out when rehabilitating an old pipe that has deteriorated. More specifically,
The present invention relates to a lining method for an existing pipe in which a spiral pipe manufactured by spirally winding a band made of a synthetic resin is manufactured and directly inserted into the existing pipe, and the existing pipe is lined with the inserted spiral pipe.

(Prior Art) Metal pipes and fume pipes have long been used for buried pipes used for water supply and sewerage. Such buried pipes may deteriorate over time and may leak due to cracking or corrosion. For this reason, recently, it has been practiced to insert a synthetic resin pipe into an existing pipe such as an aged buried pipe for lining.

One of the existing pipe lining methods is a method of lining an existing pipe with a spiral pipe manufactured by spirally winding a synthetic resin strip. This method is disclosed, for example, in JP-A-61-48690. The method disclosed in the publication is carried out by installing a pipe manufacturing machine capable of manufacturing a spiral pipe so as to face an end opening of an existing pipe.
The pipe-making machine is sequentially supplied with synthetic resin strips whose side edges can engage with each other. The pipe-making machine spirally winds the strip-like bodies, and The spiral tubes are sequentially manufactured by engaging the side edges of the strips adjacent to each other. The spiral tube to be manufactured is sequentially guided from the pipe making machine while rotating. Then, the spiral pipe led out from the pipe manufacturing machine is directly introduced into the existing pipe and is propelled while rotating in the existing pipe. When the spiral pipe is inserted over substantially the entire area of the existing pipe, a backfill material such as cement mortar is filled between the spiral pipe and the existing pipe to fix the spiral pipe in the existing pipe. As a result, the existing pipe is lined with the spiral pipe.

A flexible synthetic resin such as polyvinyl chloride, polyethylene, or polypropylene is used for the strip-shaped body that is a spiral tube. The strip is usually provided with a ridge continuously on one side edge in the longitudinal direction, and on the other side edge with a groove continuously engaged in the ridge with the ridge. Is provided for the purpose. Then, when the strips are spirally wound, the convex strips and the recessed grooves of the side edges of the strips adjacent to each other are fitted to each other to form a spiral tube.

(Problems to be Solved by the Invention) In such a lining construction method, the spiral pipe inserted into the existing pipe is propelled in the existing pipe while rotating. For this reason, the outer peripheral surface of the spiral pipe formed to have an outer diameter slightly smaller than the inner diameter of the existing pipe may contact the inner peripheral surface of the existing pipe. Resistance is added. For the pipe making machine that manufactures spiral tubes,
The strips are sequentially supplied, and the spiral pipe is made by the pipe making machine and is sequentially led out from the pipe making machine. Therefore, when resistance is applied to the spiral pipe, the spiral pipe is propelled in the existing pipe. Instead, the strip-shaped body is sequentially sent out as a spiral tube from the pipe manufacturing machine, so that the projections and the recessed grooves of the strip-shaped body, which are fitted to each other, slide out to increase the diameter of the spiral tube. In this way, when the diameter of the spiral pipe becomes large, the spiral pipe cannot be propelled in the existing pipe.

Therefore, in the conventional lining method, the inner diameter of the spiral pipe is made sufficiently smaller than that of the existing pipe in order to prevent almost all of the outer peripheral surface of the spiral pipe from contacting the inner peripheral surface of the existing pipe. It is being promoted. Therefore, in the existing pipe lined by the conventional lining method, the portion through which the fluid flows (inside the spiral pipe) becomes significantly smaller than the initial fluid passage portion (inside the existing pipe), and the fluid after lining is The flow rate of the fluid is significantly lower than the flow rate of the fluid before lining.

Furthermore, when the difference in inner diameter between the existing pipe and the spiral pipe becomes large, the spiral pipe can move inside the existing pipe. Therefore, cement mortar or the like is filled between the existing pipe and the spiral pipe with a backfill material, and the spiral pipe is already installed. Must be fixed to the pipe. Such filling of the backfill material requires a large amount of the backfill material, which is very time-consuming and impairs the economical efficiency.

The spiral pipe propelled in the existing pipe may meander when the difference in inner diameter becomes large, so that the spiral pipe easily contacts the inner peripheral surface of the existing pipe. The aging existing inner peripheral surface of the pipe is usually uneven, and when the outer peripheral surface of the existing pipe comes into contact with the inner peripheral surface of the existing pipe, high frictional resistance is added, and therefore the diameter of the spiral pipe may be expanded.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to allow a spiral pipe to be propelled into an existing pipe with a predetermined diameter without expanding the diameter of the spiral pipe. It is another object of the present invention to provide a lining method for an existing pipe that can line the inner peripheral surface of the existing pipe with a spiral pipe having a diameter substantially equal to that of the existing pipe.

(Means for Solving the Problem) The lining method for an existing pipe according to the present invention comprises a step of spirally winding a band made of a synthetic resin whose side edges can engage with each other, and the winding step. The side edges of adjacent strips are engaged with each other, and between the side edges, a metal wire rod that is heated to such a degree as to be fused with each side edge is continuously locked. Then, the step of manufacturing the spiral tube, the step of sequentially inserting the manufactured spiral tube into the existing tube and propelling the inserted spiral tube into the existing tube, and fixing the tip of the spiral tube to the existing tube And in a state in which the tip of the spiral tube is fixed to the existing tube, the wire rod is separated from between the strips, and the spiral tube is manufactured in the same manner as in the step of manufacturing the spiral tube. Strips that are mutually engaged from the disengaged portion of the wire of the spiral tube by propelling it spirally into the tube And sliding the side edges of the spiral tube to expand the diameter of the spiral tube, thereby achieving the above object.

The existing pipe lining method of the present invention comprises a step of spirally winding a synthetic resin strip whose side edges can engage with each other, and the side of the strips adjacent to each other due to the winding. While engaging the edges with each other, a wire rod having an outer peripheral surface provided with a substance that increases the frictional resistance between the edges is continuously locked between the side edges to form a spiral tube. A manufacturing step, a step of sequentially inserting the manufactured spiral tube into an existing tube, and propelling the inserted spiral tube into the existing tube; a step of fixing the tip of the spiral tube to the existing tube; With the tip of the pipe fixed to the existing pipe, the wire rod is removed from between the strips, and the spiral pipe is manufactured in the same manner as in the process of manufacturing the spiral pipe, and the strip is spirally driven into the existing pipe. By doing so, the side edges of the strips that are engaged with each other from the detached portion of the wire of the spiral tube are By moving, will encompass a step of expanding the diameter of the spiral tube, the objects can be achieved.

(Example) Hereinafter, the present invention will be described with reference to Examples.

The existing pipe lining method of the present invention is carried out, for example, when rehabilitating a concrete sewer pipe 81 which is an existing pipe, as shown in FIG. In the method of the present invention, first, the synthetic resin strip 10 is made into a spiral tube 10 'by a pipe making machine 20.
The pipe making machine 20 is installed in a manhole 82 to which one end of a sewer 81 is connected, and the spiral pipes 10 ′ made into a pipe are sequentially inserted into the sewer pipe 81. At this time, the spiral tube 10 'is
The outer diameter is sufficiently smaller than the inner diameter of the sewer pipe 81 so as not to contact the inner peripheral surface of the sewer pipe 81.

The strip 10 used in the method of the present invention has a sectional shape as shown in FIG. The strip 10 is formed of polyvinyl chloride, polyethylene, polypropylene, polycarbonate, polyester, or a resin obtained by reinforcing these resins with glass fiber.

The band-shaped body 10 includes a band-shaped substrate 12. An engaging rib protruding from one surface of the substrate 12 is provided on one side edge of the substrate 12.
13 is provided continuously in the longitudinal direction. The engaging rib 13
Has a solid cylindrical shape that is continuous in the longitudinal direction.

The other side edge portion 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, and the engaging rib 14 is provided on the engaging portion 14. Inverted U protruding in the same direction as
The character-shaped sockets 15 are connected in series. The socket 15 is
Inside, a hollow portion slightly larger than the tip of the engaging rib 13
With 15a. The socket 15 is continuous with the substrate 12 by being stepped down by the thickness of the substrate 12.

A fitting rib 16 is provided on the side of the engaging rib 13 so as to protrude from the substrate 12 in the protruding direction of the engaging rib 13. The fitting rib 16 has a T-shaped cross section having an upright portion 16a protruding upright by the thickness of the locking portion 14 and a flange portion 16b provided at the tip of the upright portion 16a. . When the engaging rib 13 is fitted in the hollow portion 15a of the socket 15, the engaging portion 14 which is continuous with the socket 15 has the engaging rib 16
It is fitted between the flange portion 16b and the substrate 12. In that case, the side edge portion of the substrate 12 provided with the engaging rib 13 is engaged with the stepped portion of the side edge portion of the substrate 12 provided with the socket 15. A slight gap is formed between the stepped-down portion of the substrate 12 and the end of the side edge portion of the substrate 12 fitted to the portion, and a wire rod described later is engaged in the gap.

The fitting rib is provided between the fitting rib 16 and the socket 15.
A plurality of reinforcing ribs 17, 17, which project in the same direction as the projecting direction of 16
, Are provided at a predetermined interval. Each reinforcing rib
17 has a T-shaped cross section having an upright portion 17a protruding from the substrate 12 in an upright state, and a flange portion 17b provided at the tip of the upright portion 17a. The upright portions 17a of the reinforcing ribs 17 are sufficiently longer than the upright portions 16 of the fitting ribs 16.

Such a strip 10 is made into a spiral tube 10 'by the pipe making machine 20 installed in the manhole 82. The pipe making machine 20 forcibly bends the strip-shaped body 10 introduced into the pipe making machine 20 by a pipe making roller 21 arranged on a cylindrical peripheral surface with a predetermined spiral angle, The strip 10 is spirally wound. And the fourth
As shown in the figure, the engaging rib 13 of the strip 10 newly introduced into the pipe making machine 20 is fitted in the hollow portion 15a of the socket 15 of the strip 10 spirally wound. , The side edges of the strips 10 adjacent to each other are engaged with each other. At this time, the socket
The locking portion 14 continuous with 15 is the flange portion 16b of the fitting rib 16.
Locked in.

In the lining method of the present invention, as described above, the relationship between the strip-shaped body 10 newly fed into the pipe-making machine 20 is inserted into the socket 15 of the strip-shaped body 10 spirally wound by the pipe-making machine 20. Almost at the same time when the mating rib 13 is fitted, it is fused to the board 12 in the gap between the stepped portion of the board 12 and the side end portion of the board 12 fitted in the stepped portion. The metallic wire rod 31 heated up to is continuously inserted. The wire rod 31 is a hard metal having no elasticity and has an outer diameter slightly larger than the engaged gap. Further, the heating temperature is preferably about 190 ° C. when the strip 10 is formed of polyvinyl chloride. When the wire rod 31 is thus engaged in the gap, the wire rod 31 is loosely fused to each side edge portion of the substrate 12, and the wire rod 31 and each side edge portion of the substrate 12 slide. Without being engaged together. Therefore, the spiral pipe 10 ′ manufactured by the pipe making machine 20 is maintained at a predetermined diameter without being expanded, and is propelled in the sewer pipe 81.

In this way, when the spiral tube 10 'in which the side edges of the adjacent strips are firmly engaged with each other is manufactured, the spiral tube 10' is manufactured.
10 'is inserted directly into the sewer pipe 81 from the pipe making machine 20. Then, the spiral pipe 10 'is propelled in the sewer pipe 81 in the axial direction while rotating. At this time, the outer diameter of the spiral pipe 10 'is the sewer pipe.
Since the spiral pipe 10 ′ is sufficiently smaller than the inner diameter of 81, the spiral pipe 10 ′ smoothly propels inside the sewer pipe 81 with almost no contact with the inner peripheral surface of the sewer pipe 81 except for the bottom portion thereof. Further, even if the spiral pipe 10 'comes into contact with the inner peripheral surface of the sewer pipe 81, its diameter is small,
The spiral tube 10 'receives a small resistance from the inner peripheral surface of the sewer pipe 81, and further, the side edges of the adjacent strips of the spiral tube 10' are loosely fused to the wire 31. Even if a high friction resistance acts on the inner peripheral surface of the sewer pipe 81 and the spiral pipe 10 ', the spiral pipe 10' does not expand in diameter and smoothly propels in the sewer pipe 81. When the tip of the spiral pipe 10 'in the propulsion direction reaches the end of the sewer pipe 81, as shown in FIG. The tip of the pipe 10 'is fixed to the end of the sewer pipe 81 by driving an anchor or the like.

In this state, the pipe making machine 20 is driven again, and
The strip 10 is fed to 20, and the spiral pipe 10 'tries to propel inside the sewer pipe 81 while rotating again.

At this time, simultaneously with the driving of the pipe manufacturing machine 20, the wire rod 31 located between the fitted side edges of the adjacent strips of the spiral pipe 10 'is fixed between the spiral pipes 10'. It is separated from the side. Since the wire rod 31 and each side edge portion of the substrate 12 of the strip 10 in the spiral tube 10 'are loosely fused, the wire rod 31 is easily separated from each side edge portion. When the wire rod 31 is detached, the strip-shaped bodies adjacent to each other in the spiral tube 10 'are brought into a state in which they can slide with each other. Then, when the strip-shaped body 10 is sequentially fed to the spiral pipe 10 ′ which has been made by driving the pipe making machine 20, the tip of the spiral pipe 10 ′ is fixed to the sewer pipe 81 as shown in FIG. 1. Since the spiral tubes 10 'are adjacent to each other, the strips 10 adjacent to each other slide against each other,
The spiral tube 10 'has an engaging rib 1 in the hollow portion 15a of the socket 15.
With the tip of 3 fitted, the diameter is increased in order from the fixed tip side. The diameter of the spiral pipe 10 ′ that has been expanded is almost in close contact with the inner peripheral surface of the sewer pipe 81.

At this time, if the strip-shaped bodies 10 adjacent to each other slide to vibrate the portion where the spiral pipe 10 'expands in diameter, the spiral pipe 10' is surely brought into close contact with the inner peripheral surface of the sewer pipe 81. The diameter can be increased.

Further, if a plurality of wire rods 31 are positioned between the side edges of the strip 10, the diameter expansion of the spiral tube 10 'can be prevented more reliably.

As shown in FIG. 5, the strip-shaped body used in the lining method of the present invention has a structure in which an engaging rib 13 ′ protruding from the substrate 12 in an upright state is arranged at an end of one side edge of the substrate 12. May be The tip of this engaging rib 13 'has a solid circular cross section. At the other side edge portion of the strip-shaped body 11, similarly to the strip-shaped body of the above-described embodiment, an engaging portion 14 'located in the protruding direction of the engaging rib 13' by the thickness of the substrate 12 and the engaging portion 14 'are formed. A socket 15 'is provided so as to be connected to the mating portion 14'. The socket 1
The tip portion of 5'is a hollow portion into which the tip portion of the engaging rib 13 'can be loosely fitted. A recessed hole in which a wire rod 31 is engaged at the base end of the socket 15 'facing the base end of the engaging rib 13'.
12a is provided. The other structure is the same as that of the strip 10.

The wire rod 31 engaged between the respective side edge portions of the mutually adjacent strip-shaped bodies in the spiral tube does not need to be heated to such a degree that the side edge portions are fused, and In order to have a high frictional resistance, for example, a knurled outer peripheral surface may be used. The outer peripheral surface of the wire 31 is knurled by a knurling device. In this case, the wire rod 31 is not limited to metal and may be made of synthetic resin.

When a knurled metal wire is used, the metal wire 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, and if a plurality of wire rods are engaged between the side edge portions of the strip, the side edge portions and the wire rod are more firmly engaged.

As the wire rod 31, a wire provided with a substance whose frictional resistance with each side edge is increased on the outer peripheral surface may be used. Examples of such a wire 31 include a metal wire such as a wire covered 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, or ，
A metal wire such as wire coated with an instant adhesive on the outer peripheral surface of the wire at appropriate intervals in the axial direction is used. Also in this case, a plurality of wire rods may be arranged between the side edges of the strip.

(Effects of the Invention) In the existing pipe lining method of the present invention, the wire rod having a high friction resistance with each side edge portion is thus locked between the side edge portions of the strip in the spiral tube. Therefore, even if a small-diameter spiral pipe contacts the existing pipe, the spiral pipe does not expand in diameter, and the spiral pipe is reliably propelled in the existing pipe. As a result, the work of propelling the spiral pipe into the existing pipe can be efficiently performed even when the existing pipe is sunk or the inner peripheral surface has irregularities. Further, the wire rod can be easily detached from between the respective side edge portions of the strip, and the spiral pipe is expanded so as to be in close contact with the existing pipe to line the existing pipe. As a result, the flow rate of the fluid in the existing pipe remains almost unchanged from before the lining, and the amount of backfill material between the spiral pipe and the existing pipe can be reduced.

[Brief description of drawings]

1 and 2 are cross-sectional views showing respective steps of carrying out the lining method of the present invention, FIG. 3 is a cross-sectional view of a band-shaped body, and FIG. 4 is a main part of the band-shaped body whose side edges are engaged with each other. Sectional view, FIG. 5 is a sectional view showing another example of the strip. 10 …… Strips, 10 ′ …… Spiral tube, 12 …… Substrate, 13 …… Engaging ribs, 15 …… Socket, 20 …… Pipe making machine, 31 …… Wire rod.

Claims (2)

[Claims] 1. A process of spirally winding a synthetic resin band-shaped body in which the respective side edges can engage with each other, and the side edges of the band-shaped bodies adjacent to each other by the winding are engaged. A process for manufacturing a spiral tube by joining the metal wire rods, which are heated to such an extent that they are fused with each side edge portion, between the side edge portions continuously, and manufacturing the spiral tube. The steps of sequentially inserting the spiral pipe into the existing pipe, propelling the inserted spiral pipe into the existing pipe, fixing the tip of the spiral pipe to the existing pipe, and fixing the spiral pipe tip to the existing pipe In this state, the wire rod is removed from between the strip-shaped bodies, the spiral tube is manufactured in the same manner as in the step of manufacturing the spiral tube, and the strip-shaped body is spirally propelled into the existing pipe, thereby Slide the side edges of the strips engaged with each other from the detached part of the wire,
A lining method for an existing pipe, including the step of expanding the diameter of the spiral pipe. 2. A step of spirally winding a synthetic resin band-shaped body in which the respective side edges can engage with each other, and the side edges of the band-shaped bodies adjacent to each other by the winding are engaged. A step of manufacturing a spiral tube by joining the wire rods each of which is provided with a substance that increases frictional resistance with each side edge portion on the outer peripheral surface between the side edge portions. Inserting the manufactured spiral pipes into the existing pipe in sequence, propelling the inserted spiral pipes into the existing pipe, fixing the tip of the spiral pipe to the existing pipe, and inserting the spiral pipe tip into the existing pipe. The wire rod is detached from between the strip-shaped bodies in a state of being fixed to the spiral tube, and the spiral tube is manufactured in the same manner as in the step of manufacturing the spiral tube, and the band-shaped body is spirally propelled into the existing tube to form a spiral. Sliding the side edges of the interlocking strips from the disengaged portion of the wire of the tube,
A lining method for an existing pipe, including the step of expanding the diameter of the spiral pipe.