JPH0684042B2 - Lining method for existing pipes - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a lining method for an existing pipe, which is applied to rehabilitating an aged existing pipe.

(Prior Art) Buried pipes such as metal pipes and fume pipes are used for waterworks and sewers. Such a buried pipe is deteriorated due to corrosion, cracking, etc., due to long-term use. The aged existing pipe is rehabilitated by lining its inner surface with, for example, a synthetic resin.

As a method of lining an existing pipe, for example, JP-A-61-1869
No. 0 gazette discloses that a pipe-making machine is temporarily installed at the open end of an existing pipe, and a lining sheet made of synthetic resin is spirally wound to form a spiral pipe while the pipe-making machine is installed. A technique is disclosed in which the inner surface of an existing pipe is inserted into the pipe and is lined with a spiral pipe made of a synthetic resin lining sheet.

However, as the synthetic resin lining sheet, a flexible lining sheet made of a resin such as polyvinyl chloride, polyethylene or polypropylene is used. In addition, the space between the existing pipe and the spiral pipe consisting of the lining sheet is generally filled with a backfill material such as cement mortar, which allows repair and reinforcement of the existing pipe and integration of the existing pipe and the spiral pipe. Is performed.

In this type of lining method, since the lining sheet is spirally wound by a pipe making machine to form a spiral tube, it is necessary that the lining sheet can be easily bent into a cylindrical shape. In order to easily bend such a lining sheet into a cylindrical shape, the lining sheet must be thin.

However, as the thickness of the lining sheet becomes thinner, the strength such as rigidity decreases. When the backfill material is injected into the space between the spiral pipe made of such a lining sheet and the existing pipe, the spiral pipe cannot withstand the injection pressure of the backfill material, and the spiral pipe is changed or damaged. To do. Such a problem becomes more remarkable as the pipe diameter increases, for example, 700 mm or more.

Therefore, it is necessary to assemble a wooden frame inside the spiral tube to reinforce the spiral tube, which is troublesome and troublesome. On the other hand, if the lining sheet is thickened in order to increase the strength such as rigidity so as to withstand the injection pressure of the backfill material, the bending operability in the pipe-making machine will deteriorate. Moreover, there is a problem that the weight of the spiral tube becomes large, the load on the roll of the pipe making machine during the pipe making becomes large, and the long-span lining pipe line cannot be continuously formed.

(Problems to be Solved by the Invention) The present invention is to solve the above problems, and an object thereof is to provide a method for lining an existing pipe having improved workability and strength of the lining pipe. To provide. Another object of the present invention is to provide a lining method for an existing pipe that can continuously form a long-span lining pipe line.

(Means for Solving Problems) The method for lining an existing pipe according to the present invention is such that a pipe-making machine is temporarily installed at an open end of the existing pipe, and a lining sheet made of synthetic resin is supplied to the pipe-making machine. A method of forming a spiral tube by winding a lining sheet in a spiral shape, and inserting the spiral tube into an existing tube to form a lining pipe line. A lining conduit made of at least two layers of spiral pipe is formed in the existing pipe by inserting the pipe, and the space between the existing pipe and the spiral pipe is filled with a backfill material, whereby the above The purpose of is achieved.

(Operation) According to the method of the present invention, as described above, since the means for forming the lining pipe line consisting of at least two layers of the spiral pipe is provided in the existing pipe, the strength such as rigidity of the spiral pipe is significantly increased as a whole. To do. For example, if the spiral tube is composed of two layers,
Both the flat strength and the external pressure strength are increased by about 8 times, and the flatness strength and the external pressure strength are increased by about 27 times when three layers are used.

Thus, as the strength of the spiral tube increases, even if the backfill material is injected into the space between the temporary tube and the spiral tube, the spiral tube as a whole can sufficiently withstand the injection pressure. Therefore, it is possible to reduce the thickness of the synthetic resin lining sheet that constitutes the spiral tube of each layer.

(Example) Hereinafter, a lining method of the present invention will be described with reference to an embodiment shown in the drawings.

FIG. 1 is a partially cutaway vertical sectional view showing an embodiment of the method of the present invention. First, existing pipes such as fume pipes and metal pipes 2
Clean the inner surface of the. And the manhole 21 of the existing pipe 2
The pipe making machine 4 is carried in from the above ground opening, and the pipe making machine 4 is temporarily installed at the open end of the existing pipe 2.

Next, the pressure transfer roll 41 of the pipe making machine 4 is adjusted on the circumference that matches the inner diameter of the existing pipe 2. Then, the lining sheet 10 made of synthetic resin is fed from the unwinder temporarily installed on the ground to the pipe making machine 4
To the pressure transfer roll 41. This pressure transfer roll 41
The lining sheet 10 is spirally wound to form the spiral pipe 1 of the first layer, and the spiral pipe 1 is attached to the existing pipe 2.
Insert it inside.

In this case, the inner peripheral surface of the existing pipe 2 is considerably uneven, so that the outer diameter of the spiral pipe 1 of the first layer needs to be considerably smaller than the inner diameter of the existing pipe 2. As a result, a considerable gap is created between the existing pipe 2 and the spiral pipe 1.

Next, the pressure transfer roll 41 of the pipe making machine 4 is readjusted on the circumference that matches the inner diameter of the spiral pipe 1 of the first layer. And
The lining sheet 10 is supplied to the pressure transfer roll 41 of the pipe making machine 4. The pressing transfer roll 41 spirally winds the lining sheet 10 in the same manner as described above to form the second-layer spiral tube 1 ', and the spiral tube 1'is placed in the first-layer spiral tube 1'. Insert it.

In this case, the inner peripheral surface of the first-layer spiral tube 1 is smooth, so that the outer diameter of the second-layer spiral tube 1'is equal to that of the first-layer spiral tube 1.
It is possible to make the diameter almost the same as the inner diameter. As a result, the spiral pipe 1 of the first layer and the spiral pipe 1'of the second layer form a double-layer spiral pipe that is substantially in close contact with each other.

As the synthetic resin lining sheet 10, a belt-shaped sheet made of polyvinyl chloride, polyethylene, polypropylene, polycarbonate, polyester, or a resin obtained by reinforcing these resins with glass fiber is used. This lining sheet 10 has an inner surface 11 as shown in FIG.
Is smooth and a plurality of rib-shaped projections 12 are provided on the outer surface along the length direction. Further, on the outer surface of one side portion of the lining sheet 10, a fitting ridge 13 is provided along the length direction,
A fitting groove 14 is provided on the inner surface of the other side portion along the length direction.

Then, the lining sheet 10 is spirally wound with the pressure transfer roll 41 of the pipe making machine 4 so that the rib-shaped projections 12 are on the outer side, and the fitting ridges 13 on one side are fitted on the other side. Ditch groove
Weigh 14 and press to fit. By such a method, it is possible to easily form the spiral tubes 1 and 1 ′ held in a cylindrical shape having a predetermined diameter from the lining sheet 10.

In the present invention, the spiral ridges 1 and 1 ′ are formed by joining the both sides of the lining sheet 10 by welding or an adhesive without providing the fitting ridge 13 and the fitting groove 14 on both sides. It is also possible to do so.

Finally, the backfill material 3 is filled in the space between the existing pipe 2 and the spiral pipe 1 of the first layer. As the backfill material 3, cement, mortar, resin concrete, hardened resin, or the like is used. The backfill material 3 is filled over the entire void. To fill the backfill material 3, the backfill material 3 is injected from the open end of the lining conduit toward the gap between the existing pipe 2 and the spiral pipe 1. Rib-shaped protrusions on the outer surface of the spiral tube 1
12 acts as an anchor, and this spiral tube 1 is a backfill material 3
Is firmly joined to.

The existing pipe 2 and the spiral pipe 1 of the first layer are integrated by the backfill material 3. Further, the spiral pipe 1 of the first layer and the spiral pipe 1'of the second layer are in close contact with each other, and both spiral pipes 1 and 1 '
And are in an integrated state. Therefore, it is not necessary to fill the voids formed between the rib-shaped projections 12 of the spiral tube 1'with the backfill material.

In addition, normally, only in the voids on both end surfaces of the spiral tube 1 ',
The sealing agent 5 is injected and sealed to ensure the integration of both spiral tubes 1 and 1 '.

In addition, a large number of small holes are formed in the spiral tube 1 of the first layer,
The filled back-filling material 3 is allowed to enter the space of the spiral tube 1'of the second layer through the above-mentioned small holes, and both spiral tubes 1 and 1 '
It is also possible to ensure integration with. In addition, the rib-like projections 12 of the lining sheet that constitute the second-layer spiral tube 1 '
It is also possible to apply a liquid resin such as a foaming urethane resin whose foaming-curing time is controlled during the pipe manufacturing and to bond both spiral pipes 1 and 1'to ensure the integration.

Thus, the lining pipe line as shown in FIG. 2 is formed, and the existing pipe is rehabilitated.

(Effect of the Invention) Since the existing pipe lining method of the present invention is configured as described above, the strength such as the rigidity of the spiral pipe is remarkably increased as a whole, and a thin lining sheet can be used. Therefore, as compared with the conventional method, the bending operability in the pipe manufacturing machine is improved, the load on the pipe manufacturing machine is reduced, and it is possible to continuously form a long-span lining pipeline as compared with the conventional method. Become.

Further, in the method of the present invention, the backfill material is filled in the space between the existing pipe and the spiral pipe. At this time, an injection pressure by the backfill material is applied to the spiral tube. However, the spiral tube has at least two layers to increase the strength. Therefore, the spiral tube withstands the injection pressure of the backfill material sufficiently and is neither deformed nor damaged. Therefore, unlike the conventional method, it is not necessary to assemble a wooden frame inside the spiral tube for reinforcement. Therefore, construction workability is improved.

Furthermore, in the method of the present invention, at least two existing pipes are used.
Reinforced by the layers of spiral tube and backfill. Therefore, as compared with the conventional method in which the spiral tube is reinforced,
The strength of the lining line is improved. The method of the present invention has the above advantages.

[Brief description of drawings]

1 is a partially cutaway vertical sectional view showing an embodiment of the method of the present invention, and FIG. 2 is a partially cutaway vertical sectional view showing a lining pipeline of an existing pipe obtained by the method shown in FIG. . Third
The figure is a partially cutaway perspective view of the lining sheet used in the above method. 1 ... 1st layer spiral tube, 1 '... 2nd layer spiral tube, 2 ...
… Existing pipe, 3 …… Back-filling material, 4 …… Pipe making machine, 5 …… Sealant, 10 …… Lining sheet, 12 …… Rib-shaped projection, 13 …… Fitting ridge, 14 …… Fitting Groove.

Claims (1)

[Claims] 1. A pipe making machine is temporarily installed at an open end of an existing pipe, a synthetic resin lining sheet is supplied to the pipe making machine, and the lining sheet is spirally wound to form a spiral pipe, A method of forming a lining conduit by inserting the spiral tube into an existing tube, wherein another spiral tube is inserted into the existing spiral tube in the same manner to complete at least 2 in the existing tube.
A lining method comprising forming a lining pipe line composed of a spiral pipe of a layer, and filling a space between the existing pipe and the spiral pipe with a backfill material.