JP3855095B2 - Pipeline lining method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for lining mainly underground underground pipes such as sewer pipes, and more particularly to a lining method suitable for repairing large-diameter pipes having a diameter of 800 mm or more that can be operated by humans in the pipes. .
[0002]
[Prior art]
In order to repair underground pipes such as sewer pipes, the inner peripheral surface of the pipe is lined. So-called pipe lining is conventionally impregnated with thermosetting resin for small and medium-diameter pipes. After the uncured flexible cylindrical lining material that has been cured is installed in the pipeline, the lining material is expanded and adhered to the inner surface of the pipeline by, for example, expanding a tube inserted inside the lining material. A so-called soft lining method, in which a thermosetting resin is cured and a new pipe is formed in an existing pipe line, is mainly employed.
[0003]
On the other hand, for large-diameter pipes having a diameter of 800 mm or more, a strip-shaped resin plate is wound spirally to form a resin pipe in the pipe, and a backfill material is provided in the gap between the existing pipe inner surface and the resin pipe. A so-called pipe making method, which is injected and cured, is mainly employed.
[0004]
[Problems to be solved by the invention]
By the way, the pipe making method mainly adopted for repairing large-diameter pipes forms resin pipes from long strip-shaped resin plates, so the amount of advancement is as low as about 20-30 m, and when backfilling However, since it is necessary to set up a support so that the resin pipe does not collapse due to the pressure at the time of backfilling, there is a disadvantage that work is often performed in the pipeline and workability is poor.
[0005]
On the other hand, in the soft lining method, the lining work is basically performed at once using a cylindrical lining material covering the entire length of the pipe to be repaired. Not only is it very fast and it does not require much work in the pipeline, it has good workability, but it is not applied to repair large-diameter pipelines for the following reasons.
[0006]
That is, first, the diameter of the lining material increases in accordance with the pipe diameter, and it becomes difficult to insert it into the pipe through the manhole. Secondly, the increase in size makes it impossible to carry in the site without using a large transport vehicle, making it difficult to implement on narrow roads.
[0007]
The purpose of the present invention is to solve the above-mentioned problems in repairing large-diameter pipes while taking advantage of the short-time workability and good workability that are the advantages of the soft lining method, An object of the present invention is to provide a method for lining pipes that can be constructed in a short period of time with good workability.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the pipe lining method of the present invention is a method of covering the inner peripheral surface of an existing pipe for repairing, and the sum of the widthwise dimensions is the circumferential dimension of the pipe to be repaired. Longer, and using a plurality of uncured flexible lining materials impregnated with a thermosetting resin, respectively, so that the width direction of each lining material is along the circumferential direction of the pipeline to be repaired, and It is characterized by lining the existing pipes one by one so that both ends in the width direction overlap each other (claim 1).
[0009]
Here, in the present invention, it is preferable to adopt a method (Claim 2) in which the number of the above-mentioned lining materials is two, and first, the lower half of the pipeline to be repaired is lined, and then the upper half is lined. it can.
[0010]
The present invention basically conforms to the soft lining method having the above-mentioned advantages, but unlike the conventional soft lining method, the lining material is not formed into a cylindrical shape, and the cylindrical body is substantially plural in the circumferential direction. In order to achieve the intended purpose, the inner part is lined in order so that the divided parts overlap each other.
[0011]
That is, in the present invention, as the lining material, a flexible material impregnated with a thermosetting resin is used in the same manner as the conventional soft lining method, but this is not a tubular shape, but a plurality of sheets. The total width dimension is made longer than the circumferential dimension of the pipe to be repaired, and each lining material is placed along the circumferential direction of the pipe line so that both ends in the width direction overlap each other. Line one by one. Thereby, even if it is a large diameter pipe line, it becomes unnecessary to enlarge the dimension (width | variety) of each lining material, and it does not cause trouble in carrying in and carrying from a manhole. The length of each lining material is the same as that of the conventional soft lining method, and it matches the length of the pipe to be repaired. Some short-term workability and good workability can be maintained.
[0012]
Further, as in the invention according to claim 2, the number of divisions in the circumferential direction of the lining material is set to 2, and after first lining the lower half of the pipe line, the upper half is lined, At the time of lining, it is possible to prevent the lining material for the upper half from falling off downward because the lining material of the lower half that was lined first protrudes toward the inner surface of the pipe line. Become.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic sectional view showing the structure of a pipeline lined by the method of the present invention, and is a view cut along a plane perpendicular to the axial direction of the pipeline. On the inner peripheral surface of the existing pipe 1, a first lining material 2a is lined on the lower half 1a, and a second lining material 2b is lined on the upper half 1b. The lining materials 2a and 2b have substantially the same width, and the total dimension of the widths is longer than the inner peripheral dimension of the existing pipe 1 by a predetermined dimension. Each lining material 2a, 2b is lined in a state in which the respective width direction is along the circumferential direction of the existing pipe 1, and on the both ends in the width direction of the first lining material 2a covering the lower half, The second lining material 2b covering the half is lined with both ends in the width direction overlapping each other. Moreover, the length of each lining material 2a, 2b is equivalent to the length L of the repair target pipe line W shown below.
[0014]
As an example of the structure of each of the lining materials 2a and 2b, as shown in a schematic cross-sectional view in FIG. A fabric having a structure in which woven fabrics 22 and 23 such as cloth are laminated and impregnated with a thermosetting resin such as an unsaturated polyester resin can be used.
[0015]
Next, the procedure for lining the above lining materials 2a and 2b on the inner peripheral surface of the existing pipe 1 will be described in detail. 3 to 7 are explanatory diagrams of the procedure.
First, as shown in a sectional view parallel to the axial direction of the pipe line in FIG. 3, if the pipe W to be repaired is between manholes B and C, the manhole B at the upstream end of the pipe W to be repaired The water stop plug 11a is struck to the downstream side of the manhole A located further upstream of the manhole A, and the water is blocked to the upstream side of the manhole D located further downstream of the manhole C at the downstream end of the pipe W to be repaired. The water plug 11b is disposed, and the water blocked by the water stop plug 11a is guided to the downstream side of the water stop plug 11b via the drain hose 13 by the water change pump 12 provided on the ground, and water is changed. Thereby, between the manholes B and C which are the repair target pipe lines W will be in a dry state.
[0016]
Next, as shown in FIG. 4 showing an axial parallel cross-sectional view of the pipe line and FIG. 5 showing an axial orthogonal cross-sectional view, the manhole B or C is impregnated with a thermosetting resin, and the viscosity is increased as necessary. The uncured flexible first lining material 2a in the uncured state is drawn into the repair target pipe W and along the lower half 1a of the existing pipe 1, and the first lining material is laminated in advance on the upper surface thereof. Terminal fittings 4a and 4b are attached to both ends of the expansion tube 3 having a length equivalent to the length L of the pipe W to be repaired, which is drawn together with 2a or later drawn into the upper surface of the first lining material 2a. With the inside thereof sealed, air is pressed into the expansion tube 3 from the fluid supply port 5a communicated with the terminal fitting 4a or 4b. Thereby, the 1st lining material 2a closely_contact | adheres to the lower half part 1a of the internal peripheral surface of the existing pipe 1. FIG. In the tight contact state, the air in the expansion tube 3 is discharged from the fluid discharge port 5b communicated with the terminal fitting 4b or 4a, and a heating fluid such as steam or hot water is pressed into the expansion tube 3 from the fluid supply port 5a. The thermosetting resin is cured. As a result, the first lining material 2a is lined on the lower half 1a of the inner peripheral surface of the existing pipe 1.
[0017]
Next, after removing the end fittings 4a and 4b from the expansion tube 3 and discharging the internal fluid, FIG. 6 shows an axial parallel sectional view of FIG. 6, and FIG. Similarly to the first lining material 2a, the uncured flexible second lining material 2b impregnated with a thermosetting resin and appropriately thickened as necessary is supplied from the manhole B or C to the pipe W to be repaired. Pull it in and place it on the tube 3. In this state, the end fittings 4a and 4b are attached to the expansion tube 3, and air is press-fitted into the inside in a sealed state, whereby the second lining material 2b has already been lined at both ends in the width direction. The first lining material 2b is brought into close contact with both end portions in the width direction so as to cover the upper half 1b of the inner peripheral surface of the existing pipe 1. Thereafter, a heating fluid such as steam or hot water is press-fitted into the expansion tube 3 to cure the thermosetting resin of the second lining material 2b. Through the above steps, the conduit having the structure shown in FIG. 1 is obtained.
[0018]
In this embodiment, a point to be particularly noted is that the lining material covering the inside of the existing pipe 1 is divided into the first and second lining materials 2a and 2b, and these are overlapped at both ends in the width direction. This is because the inner lining materials 2a and 2b are made of the same diameter pipe by a conventional soft lining method even if the existing pipe 1 is a large diameter pipe having a diameter exceeding 800 mm. As a result of being able to keep the size and weight to about a half or more compared to the case of lining, it is possible to carry it into an existing pipe through a manhole, and especially large vehicles are required for transportation to the site. It will not be.
[0019]
Further, after lining the first lining material 2a on the lower half 1a of the existing pipe 1, by lining the upper half 1b with the second lining material 2b, at the time of lining the second lining material 2b, The first lining material 2a that has already been lined functions as a business trip in the existing pipe 1 to support and position the second lining material 2b, improving workability, and the first and second lining materials 2a, There is an advantage that the total dimension of the width of 2b may be slightly longer than the inner peripheral dimension of the existing pipe 1.
[0020]
Regarding the handling of the expansion tube 3, when the first lining material 2a is lined, it may be drawn simultaneously with the first lining material 2a, or may be drawn into the existing pipe 1 after the first lining material 2a is drawn. As described above, when the second liner 2b is lined, the same material used for the liner of the first liner 2a as in the above-described embodiment is used as it is, and the second liner is disposed thereabove. In addition to pulling in 2b, a method of drawing a separately prepared material into the existing pipe 1 at the same time as the second lining material 2b, and a first lining material 2a in which a separately prepared expansion tube 3 has already been lined. A method may be employed in which the second lining material 2b is drawn after being drawn onto the top.
[0021]
Further, as the structure of the first and second lining materials 2a and 2b, in addition to the structure shown in FIG. 2, a lining material having a known structure in which a sheet molding compound (SMC) or a film or the like is arranged on the surface thereof is used. However, the structure shown in FIG. 2 should be thin, lightweight and have high strength by adopting a sandwich structure in which a nonwoven fabric is sandwiched between high-density woven fabrics made of glass or other fibers. This is preferable.
[0022]
Further, in the above embodiment, an example in which the inner peripheral surface of the existing pipe 1 is covered with two lining materials, that is, an example in which the lining material is divided into two in the circumferential direction has been shown. Any number of lining materials whose total width dimension is longer than the circumferential dimension of the pipe to be repaired are sequentially placed on the inner circumferential surface of the existing pipe 1 so that the respective end portions in the width direction overlap each other. Can be lined.
[0023]
【The invention's effect】
As described above, according to the present invention, the uncured flexible lining material impregnated with the thermosetting resin is not formed into an integral cylindrical shape as in the conventional soft lining method, but is provided in a circumferential direction. Since each lining material is sequentially lined on the inner peripheral surface of the existing pipe so as to overlap each other in the width direction, an increase in the size of each lining material can be avoided even when repairing a large-diameter pipe. Can be carried in at the same time, and at the same time, it can be carried into the site by a normal vehicle by avoiding an increase in weight. Moreover, it is basically possible to use a soft lining method and use a lining material with a length equal to the total length of the pipe to be repaired, so that there is little work in the pipe and it can be constructed in a short period of time. The advantages of the soft lining method can be used as they are.
[0024]
Further, as in the invention according to claim 2, if the number of divisions in the circumferential direction of the lining material is 2, and the lining of the upper half is applied after applying the lining to the lower half of the existing pipe, During lining of the half part, the lower lining material already lined functions to support and position the upper lining material, so the required lining can be easily obtained even if the overlapping amount of each lining material is reduced. Thus, the width dimension of each lining material can be shortened, and at the same time, the amount of reduction in the pipe cross section due to the repair can be reduced, and the reduction in the pipe flow rate can be prevented.
[Brief description of the drawings]
FIG. 1 is an axial cross-sectional view schematically showing the structure of a pipe line repaired by a lining method to which the method of the present invention is applied.
2 is a schematic cross-sectional view showing an example of the structure of first and second lining materials 2a and 2b in FIG.
FIG. 3 is a procedure explanatory diagram of the embodiment of the present invention, and is a schematic axial parallel cross-sectional view showing a state in which a pipe W to be repaired is dry by water change.
FIG. 4 is a schematic explanatory view of the procedure of the embodiment of the present invention, and is a schematic axial parallel sectional view showing a state where the first lining material 2a and the expansion tube 3 are inserted into the existing pipe 1.
5 is an explanatory diagram of procedures according to the embodiment of the present invention, and is a schematic cross-sectional view orthogonal to the axis in the state of FIG. 4;
FIG. 6 is a procedure explanatory view of the embodiment of the present invention, schematically showing a state in which the second lining material 2b and the expansion tube 3 are inserted into the existing pipe 1 after the lining of the first lining material 2a. FIG.
FIG. 7 is an explanatory diagram of procedures according to the embodiment of the present invention, and is a schematic cross-sectional view perpendicular to the axis in the state of FIG. 6;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Existing pipe 1a Lower half part 1b Upper half part 2a 1st lining material 2b 2nd lining material 3 Expansion tube 4a, 4b Terminal metal fitting 5a Fluid supply port 5b Fluid discharge port 11a, 11b Water stop plug 12 Water change pump 13 Drain hose W

Claims (2)

A method of covering an inner peripheral surface of an existing pipe for repairing,
The total width dimension is longer than the circumferential dimension of the pipe to be repaired, and a plurality of uncured flexible lining materials each impregnated with a thermosetting resin are used. A method of lining a pipe, wherein the pipes are lined one by one in an existing pipe so that both ends of the pipe in the width direction overlap each other along the circumferential direction of the pipe to be repaired. The method of lining a pipe according to claim 1, wherein the lining material is made of two sheets, and first, the lower half of the pipeline to be repaired is lined, and then the upper half is lined.

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