JP7016513B2 - Sewer main repair method - Google Patents

Description

The present invention relates to a method of lining the inner surface of a sewer pipe when the sewer pipe is aged.

Existing pipes such as sewage pipes have deteriorated due to long-term use, and the number of existing pipes that have exceeded their useful life is increasing year by year. In particular, aged sewage pipes are deformed and cracked, and not only the flow function of sewage is reduced, but also groundwater and earth and sand around the sewage pipes flow into the sewage pipes, creating cavities in the ground. Causes the ground to sink. In addition, sewer pipes buried in the ground are susceptible to ground movements such as earthquakes, and the current situation is that some kind of repair is required at a predetermined time.

The sewer pipe generally has a sewer main connected to a manhole pipe and a mounting pipe connected to the sewer main. The sewage that has flowed into the basin for household use flows into the sewer main through the attachment pipe connected to the basin.

As a method for repairing a sewage pipeline including a connection portion between a sewer main and a mounting pipe, the method described in Patent Document 1 is known. The method of Patent Document 1 describes a method of lining the inner peripheral surfaces of a sewer main and a mounting pipe with a lining material, respectively. As the lining material, a lining material made of a curable resin that is cured by light or heat is used. For example, in the lining of a sewer main, after introducing the lining material into the sewer main, the lining material is pressed against the inner surface side of the sewer main by supplying air to a closed space formed by sealing both ends of the lining material. This is done by performing curing work with light or heat in this state.

Japanese Unexamined Patent Publication No. 10-225990

However, when air is supplied to the inside of the lining material for the sewer main to form the lining material into a circular cross section, a part of the lining material is extruded into the space on the mounting pipe side at the connection portion between the mounting pipe and the above. Since the curing is performed in that state, the lining material has a distorted shape as if it were drawn toward the mounting pipe at the portion. Then, there is a risk that the proper repair effect of the lining material cannot be obtained.

Therefore, an object of the present invention is to prevent the lining material for the sewer main from being pushed out into the space of the mounting pipe at the connection portion between the sewer main and the mounting pipe, and to obtain an appropriate repair effect by the lining material. It is to provide a sewer main repair method that can be done.

In order to solve the above object, the sewerage main repair method according to claim 1 is
It is a sewer main repair method that repairs the sewer main by lining the inner surface of the sewer main to which the mounting pipe is connected.
It has a size that can cover the opening of the mounting pipe at the connection portion between the sewer main and the mounting pipe, and has a hardness that is harder than the uncured state of the photocurable lining material. The sheet member introduction step of introducing the sheet member into the sewer main, and
The lining material introduction step of introducing the tubular lining material into the sewer main in an uncured state, and
A pressing process in which the outer peripheral surface of the lining material is pneumatically pressed against the inner peripheral surface side of the sewer main.
A curing step of curing the lining material by irradiating light in the pressed state, and
Including
In the pressing step, the sheet member is arranged so as to cover the opening of the mounting pipe between the lining material and the sewer main at the connection portion between the sewer main and the mounting pipe. It is characterized by doing in.

According to this configuration, in the pressing process, at the connection portion between the mounting pipe and the sewer main, the sheet member is arranged between the sewer main and the lining material so as to cover the opening of the mounting pipe. Even if the lining material is pressed against the inner surface side of the sewer main, the presence of the sheet member that is harder than the lining material can prevent a part of the lining material from being pushed out to the inside of the mounting pipe. .. Therefore, the hardened lining material formed by the method of the present invention has a clean pipe shape that follows the shape of the inner peripheral surface of the sewer main.

The sewerage main repair method according to claim 2 is to simultaneously perform the sheet member introduction step and the lining material introduction step by introducing the sheet member and the lining material into the sewerage main in a combined state. It is characterized by.

According to this configuration, the work process for introducing the sheet member and the lining material can be shortened as compared with the case where the sheet member and the lining material are introduced separately. Therefore, the sewerage main repair method of the present invention can be efficiently carried out. can.

The sewerage main repair method according to claim 3 is characterized in that the sheet member introduction step and the lining material introduction step are performed separately. According to this configuration, the sewer main repair method of the present invention can be carried out without requiring a place or work for combining the sheet member and the lining material.

The sewer main repair method according to claim 4 is characterized in that the sheet member is composed of at least one selected from the group consisting of polyolefin, polyethylene terephthalate and polybutylene. With these materials, it is possible to reliably prevent the lining material from being extruded into the mounting pipe in the pressing process.

The sewer main repair method according to claim 5 is characterized in that the thickness of the sheet member is 0.2 to 0.4 mm, and the flexural modulus of the sheet member is 800 to 4000 N / mm ² . do. Within this range, it is possible to reliably prevent the lining material from being extruded into the mounting pipe in the pressing process.

According to the present invention, there is provided a pipe lining method capable of preventing the lining material for the sewer main from being extruded into the space inside the mounting pipe at the connection portion between the sewer main and the mounting pipe, and lining properly. can do.

It is a schematic diagram which shows the situation which the seat member is introduced into the sewer main. It is sectional drawing (a) and the detailed drawing (b) with the sheet member introduced. It is a schematic diagram which shows the situation which the lining material is introduced in the sewer main. It is sectional drawing which shows the state which the lining material was introduced. It is a schematic diagram which shows the pressing process and the curing process. It is sectional drawing of the sewer main part of FIG. It is a vertical sectional view which shows the state which the repair method of this invention is completed. FIG. 7 is a cross-sectional view of FIG. 7.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a state in which a seat member is introduced into a sewerage main in one embodiment of the present invention, and FIG. 2A shows a state in which a seat member is introduced into the sewerage main. It is sectional drawing of the pipe part. As shown in the figure, a sewer main 102 is provided between the two manholes 100-1 and 100-2, and the manholes 100-1 and 100-2 and the sewer main 102 are connected by fluid communication. A mounting pipe 104 is connected to the sewer main 102, and the sewage that has flowed into the basin 106 for household use or the like flows into the sewer main 102 via the mounting pipe 104, so that the sewage is discharged.

The seat member 10 is introduced from the ground to the sewer main 102 via the manhole 100-1. The introduction work is performed by pulling the seat member 10 into the sewer main 102 by a wire 50 connected to a pull-in machine 49 installed on the ground on the other manhole 100-2 side. The sheet member 10 is a strip-shaped member, and its length is formed to be the same as or slightly longer than the length of the sewer main 102 located between the manholes 100-1 and 100-2. The width of the seat member 10 may be wide enough to cover the opening 104a of the mounting pipe 104 at the connection portion between the sewer main pipe 102 and the mounting pipe 104. Specifically, it may depend on the connection position of the mounting pipe 104 in the sewer main 102. As shown in the cross-sectional view of FIG. 2, since the mounting pipe 104 is generally connected to a position of 10 to 40 ° with respect to the upward direction of the cross section of the sewer main 102, the mounting pipe 104 arranged at such a position The width of the sheet member 10 is determined so as to be large enough to cover the opening of the sheet member 10. As shown in FIG. 2, the seat member 10 covers the opening 104a of the mounting pipe 104 with the seat member 10 introduced. Further, the length of the seat member 10 margin length L shown in FIG. 2B, that is, the length of the portion 104c located at the top of the inner diameter of the mounting pipe 104 from one end 10b in the width direction of the seat member 10 is the inner diameter of the mounting pipe. It is advantageous from the viewpoint of the effect of the present invention that the length is longer than 1/4 of the length.

Examples of the material of the sheet member 10 include polyolefins such as polyethylene and polypropylene, polyesters such as polyethylene terephthalate, and polybutene. The thickness of the sheet member 10 is preferably 0.2 to 0.4 mm, and the flexural modulus is preferably 800 to 4000 N / mm ² . The thickness of the seat member 10 is appropriately adjusted according to the hardness of the seat member 10 and the size of the sewer main 102.

Next, the process of introducing the lining material will be described. FIG. 3 shows a state in which the lining material is introduced into the sewerage main 102, and FIG. 4 is a cross-sectional view of a sewerage main part showing a state in which the lining material is introduced into the sewerage main. As for the introduction work of the lining material 20, the lining material 20 is pulled in from the ground and introduced into the sewer main 102 through the manhole 100-1 in the same manner as the introduction work of the seat member 10. The lining material 20 is arranged on (inside) the previously introduced sheet member 10.

The lining material 20 to be used may be one that has been conventionally used, and a lining material 20 having an outer diameter of the same as or substantially the same as the inner diameter of the sewer main 102 is used. The thickness of the lining material 20 can be appropriately selected depending on the pipe diameter of the sewer main main 102 to be applied, but is generally 3 mm to 30 mm. Generally, the larger the pipe diameter of the sewer main 102, the thicker the lining material is used. In the arranged state, the length of the lining material 20 is slightly longer than the length of the sewer main 102. At the time of introduction, the lining material 20 is in an uncured state, and is not in a circular cross section but in a folded state.

Next, the pressing process of pressing the lining material 20 against the inner surface side of the sewer main 102 will be described. FIG. 5 shows a state in which the lining material 20 is pressed against the inner surface side of the sewerage main 102, and FIG. 6 is a cross-sectional view of the sewerage main 102 portion (the irradiation device is not shown). As shown in the figure, one end 20a of the lining material 20 is connected to the air introduction pipe 28, and the other end 20b is closed with a closing member to form a closed space 200 inside the lining material 20. By supplying air from the air introduction pipe 28 to the closed space 200, the cross section changes from the folded state at the time of introduction to a circular cross section, and the lining material 20 is pressed against the inner surface side of the sewer main 102. The air introduced into the closed space moves in the lining material 20 in the direction of the arrow 300, is discharged from the other end 20b of the lining material 20, and the closed space 200 is maintained at a predetermined pressure. Hazardous substances such as styrene produced are removed from the discharged air by the deodorizing device 110 arranged on the manhole 100-2.

Then, at the connection portion between the sewer main 102 and the mounting pipe 104, the sheet member 10 covers the opening 104a of the mounting pipe 104 between the lining material 20 and the sewer main 102.

Next, the curing process will be described. As shown in FIG. 5, in the above pressing step, the curing work is performed in a state where the lining material 20 is pressed against the inner surface side of the sewer main 102. The curing work may be performed by a conventional method. When the lining material 20 is cured by light such as electromagnetic waves, particularly ultraviolet rays, as shown in the figure, in order to cure using an irradiation device 60 configured by connecting a plurality of lamps 62 in series. The uncured lining material 20 can be cured by irradiating it with a required electromagnetic wave, particularly light such as ultraviolet rays. The irradiation device 60 irradiates while moving in the direction of the arrow 400. When the lining material 20 is formed by using a thermosetting resin, it can be cured by heating the lining material 20. After curing, processing such as pipe opening treatment and cutting out a region corresponding to the opening of the mounting pipe 104 of the lining material 20 in the connection portion is performed.

As described above, the lining method of the present invention is completed. FIG. 7 is a vertical sectional view after the repair is completed, and FIG. 8 is a horizontal sectional view thereof. As shown in the figure, the lining material 20 is neatly formed at the connection portion between the sewer main 102 and the mounting pipe 104. According to the present invention, by interposing a sheet member 10 harder than the lining material 20 between the sewer main 102 and the lining material 20 at the connection portion between the sewer main 102 and the mounting pipe 104, the pressing process can be performed. It is possible to prevent the lining material from being pushed out into the mounting pipe of the connection portion when the gas is supplied. Therefore, the lining material is not cured in a distorted shape, and it is possible to perform a clean lining in a cured shape.

In the above-described embodiment, the method of introducing the seat member 10 and the lining material 20 separately into the sewer main 102 is shown, but the present invention is not limited to this, and the seat member 10 and the lining material 20 are introduced before being introduced into the sewer main 102. It may be introduced together with the lining material 20 in combination. In this case, the seat member 10 is combined so that the seat member 10 is on the outside and the lining material 20 is on the inside.

10 Seat member 20 Lining material 100 Manhole 102 Sewer main 104 Mounting pipe 106 Masu

Claims (5)

It is a sewer main repair method that repairs the sewer main by lining the inner surface of the sewer main to which the mounting pipe is connected.
It has a size that can cover the opening of the mounting pipe at the connection portion between the sewer main and the mounting pipe, and has a hardness that is harder than the uncured state of the photocurable lining material. The sheet member introduction step of introducing the sheet member into the sewer main, and
The lining material introduction step of introducing the tubular lining material into the sewer main in an uncured state, and
A pressing process in which the outer peripheral surface of the lining material is pneumatically pressed against the inner peripheral surface side of the sewer main.
A curing step of curing the lining material by irradiating light in the pressed state, and
Including
In the pressing step, the sheet member is arranged so as to cover the opening of the mounting pipe between the lining material and the sewer main at the connection portion between the sewer main and the mounting pipe. Sewerage main repair method characterized by performing in. The method according to claim 1, wherein the sheet member introduction step and the lining material introduction step are simultaneously performed by introducing the sheet member and the lining material into the sewer main in a combined state. The method according to claim 1, wherein the sheet member introduction step and the lining material introduction step are performed separately. The method according to any one of claims 1 to 3, wherein the sheet member is composed of at least one selected from the group consisting of polyolefin, polyethylene terephthalate and polybutylene. The invention according to any one of claims 1 to 4, wherein the sheet member has a thickness of 0.2 to 0.4 mm, and the flexural modulus of the sheet member is 800 to 4000 N / mm ² . the method of.

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