JPH0714618B2 - Hard tube lining method for inner surface of buried sewer pipe - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for lining a hard tube inside a buried sewer pipe.

Conventional technology and its problems As a conventional hard tube lining construction method for the inner surface of a buried sewer pipe, a hard plastic tube inserted into the sewer pipe with a reduced cross-sectional dimension is heated and pressurized from the inside by applying a heating and pressurizing fluid to expand it. A construction method has been proposed in which the inner surface of the pipe is adhered to the inner surface of the pipe (see, for example, JP-A-63-296924). This type of lining method is usually performed using a manhole, and most of the work is done inside the manhole, but the work space is inefficient because the manhole is too small to secure a sufficient working space. There was also a problem that it was dangerous. Such a problem can be solved by, for example, pulling out the excess end of the tube from the manhole to the ground and omitting the work inside the manhole. However, in this way, the excess end of the tube is overexpanded during the heating and pressurizing expansion of the manhole. The mouth will be blocked, and subsequent work will be difficult.

The present invention has been made for the purpose of eliminating such conventional problems.

Means for Solving the Problems The present invention is a method for forming a hard tube lining on the inner surface of a sewer pipe between two manholes by using a manhole as a working port, and it is possible to use two manholes with a reduced cross-sectional dimension. After surplus ends of both ends of the hard plastic tube inserted in the sewer pipe between the manholes are raised in the manhole and pulled out to the ground, and after covering the tube rising part in the manhole with a protective cylinder for overexpansion, the above The tube is heated and pressurized from the inside by application of a heating and pressurizing fluid according to the usual method to expand and adhere to the inner surface of the sewer pipe, while maintaining a circumferential gap between the rising part of the tube and the manhole based on the prevention of overexpansion. A remote-controlled tube cutting tool is inserted into the manhole through the above-mentioned clearance, and the rising part of the tube is cut and removed. Related to the tubing method.

Example An example of the method of the present invention will be described below with reference to the accompanying drawings.

When carrying out the method of the present invention, a hard plastic tube (3) is first inserted into the sewer pipe (2) between the manholes (1) and (1) as shown in FIG.

The hard plastic tube (3) is made of a thermoplastic material such as vinyl chloride resin, has an outer diameter substantially the same as the inner diameter of the sewer pipe (2), and crosses as shown in the enlarged sectional view of FIG. The surface is crushed flat from a circle and then folded in half to reduce the cross-sectional shape. The plastic tube (3) is heated and softened by a conventional method, for example, by a heating fluid flowing inside under the reduced state of the cross section, and the sewer pipe (2).
The extra ends (3a) (3a) at both ends thereof are inserted into the inside of the manholes (1) (1) around the guide rolls (4) (4) and are pulled out to the ground.

The upper ends of the extra ends (3a) and (3a) pulled out to the ground are restored to their original cross-sectional shapes by appropriate preliminary operations, and plugs (5) and (5 ') are applied to the restored portions. Along with the extra end (3a) (3
A protective cylinder (6) for preventing overexpansion is covered on the outside of a) from the upper end to the vicinity of the guide roll (4) at the lower end.

The protection tube (6) is made of fiber and is non-stretchable, and its inner diameter is approximately equal to the outer diameter of the tube (3) before the reduction of the cross section. A preferred example of the protective tube (6) is shown in FIG. 4, and can be opened appropriately at the slide fastener (7) part so that the tube (3) can be attached to and detached from the rising portion from the side. It is configured. In this case fasteners (7)
It is convenient to provide a plurality of protective cylinders (6) because the outer diameter of the protective cylinder can be adjusted. In order to appropriately adjust the lengthwise dimension of the protective tube (6), it is possible to add a suitable structure as schematically shown in FIG.

The upper end of the extra edge (3a) is the suspension stand (8) installed on the ground.
It is supported by a hanging metal fitting (9) and a hanging rope (10), and keeps standing up in the manhole (1).

A heating fluid such as a steam supply conduit (11) is inserted into one of the stoppers (5) provided at the upper end of the extra end (3a), and a steam discharge conduit (11) is attached to the other stopper (5 '). 12) is attached, and the flow conduits (11) (12) are equipped with flow rate adjusting valves (13), respectively. Furthermore, the other stopper (5 ')
One end of the drain hose (14) is inserted and attached so that it can be inserted downward as necessary, and a steam trap (14a) is provided at the tip of the hose (14).

When steam is supplied into the tube (3) through the conduit (11) in the state shown in FIG. 1 and the tube (3) is heated and pressurized from the inside, the tube (3) expands and restores its original shape. While being attached to the inner surface of the sewer pipe (2), the surplus ends (3a) (3a) rising in the manhole (1) are also restored to their original shape.

The state after this shape restoration is shown in FIG. 2, and the excessive expansion of the extra ends (3a) (3a) during the heating and pressurizing expansion operation is prevented by the protective cylinder (6), and thus the manhole (1) is formed. A circumferential gap (15) for preventing overexpansion is held between the extra end and the extra end.

During the heating, pressurizing and expanding operation of the tube (3), the tube (3)
As shown in FIG. 2, the drain (17) collects at the bottom of the hose (14). The drain (17) inserts the steam trap (14a) at the tip of the hose (14) to the bottom of the tube (3). By doing so, it can be removed.

After the heating and pressurizing and expanding operation of the tube (3) is completed, the steam is replaced with the outside air and the tube (3) is cooled while keeping the tube (3) in a pressurized state. A hard tube lining (3 ') can be formed on the inner surface of the sewer pipe (2).

After forming the rigid tube lining (3 '), the second
As shown in the manhole (1) on the right side of the figure, by inserting the remotely operated cutting tool (16) into the manhole (1) through the circumferential gap (15) and cutting the extra end (3a), The surplus (3a) can be removed by ground control.

After removing the surplus end (3a), the work is performed in the manhole (1), and the end treatment of the hard tube lining (3 ') is performed in the usual manner.

The cutting tool (16) only needs to be capable of cutting the surplus end (3a) by remote control. In the figure, a linear heater that generates heat by energizing the lower ends of the two parallel grips (16a) (16a). (16b) is provided, and the heater (16b) is used for fusing.

Effect According to the method of the present invention, the extra ends (3a) (3a) of the tube (3) having a reduced cross section inserted in the sewer pipe (2) are pulled out to the ground through the manholes (1) (1), Since the tube (3) can be heated and expanded and the surplus ends (3a) and (3a) can be cut and removed, it is possible to perform all operations on the ground except for the end treatment of the hard tube lining (3 '), After cutting and removing the surplus ends (3a) (3a), the work can be performed efficiently and safely as compared with the conventional method of performing heating and pressure expansion.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing the condition immediately before the tube heating / pressurizing / expanding step of the method of the present invention, FIG. 2 is a vertical cross-sectional view showing the condition after the heating / pressurizing and expanding process, and FIG. FIG. 4 is an explanatory view showing a processing state, and FIG. 4 is a perspective view showing an example of a protection cylinder for preventing overexpansion. In the figure, (1) is a manhole, (2) is a sewer pipe,
(3) is a hard plastic tube, (4) is a guide roll, (5) and (5 ') are stoppers, (6) is a protective cylinder, (8) is a suspension stand, (9) is a suspension fitting, and (10) is Suspension rope, (11) steam supply conduit, (12) discharge conduit, (13) flow control valve, (14) drain hose, (15) clearance, (16) remote control It is a cutting tool.

Claims (1)

[Claims] 1. A method for forming a hard tube lining on the inner surface of a sewer pipe between two manholes by using a manhole as a working port, wherein the cross sectional dimension is reduced to 2
After the hard plastic tube inserted into the sewer pipe between the two manholes, the surplus ends of both ends are raised in the manhole and pulled out to the ground, and after covering the tube rising part in the manhole with a protective tube for overexpansion, The tube is heated and pressurized from the inside by application of a heating and pressurizing fluid according to a conventional method to expand and adhere to the inner surface of the sewer pipe, while maintaining a circumferential gap between the tube rising portion and the manhole based on overexpansion prevention, Next, a method for inserting a remotely operated tube cutting tool into the manhole through the above-mentioned clearance to cut and remove the rising portion of the tube, and a hard tube lining method for the inner surface of the buried sewer pipe.