JPS63152794A - Method of repairing pipe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is applicable to, for example, concrete pipes for sewerage or industrial drainage, etc. whose inner surfaces are corroded due to the influence of gases etc. generated from circulating materials. Regarding repair methods in case.

(Prior Art and Problems) Conventionally, the following methods have been used to repair this type of pipe.

(a) A method of applying or spraying a repair material (for example, epoxy resin) onto the corroded surface of the pipe.

(b) A method of inserting and arranging a synthetic resin product (for example, a molded product made of hard vinyl chloride resin material) into a pipe to form a double pipe; the above products include (a) products molded into a cylindrical shape; (hereinafter referred to as repair pipe).

(b) A pipe made by winding a band-shaped plate into a spiral shape (hereinafter referred to as a spiral pipe).

By the way, in the method (a) above, the worker enters the pipe through the manhole, so it requires great skill and effort to finish the repair material uniformly in a bad working environment, and it also requires a lot of time and effort to finish the repair material evenly in a bad working environment. This is not preferable from a health management perspective due to the effects of the gas, and there are also problems such as the need to monitor the repair material until it hardens.

Furthermore, in the methods (b) to (a), as shown in FIG. 4, the repair pipe 11 is carried into the manhole 10, and inside the pipe 12, the worker inspects the rear end peripheral surface of the repair pipe 11. and the front end circumferential surface of the subsequent repair pipe 11 are sequentially joined to the front of the pipe 12, and the required number of repair pipes 11 connected in series are connected to the pipe 12.
It is installed inside.

Therefore, when the outer diameter of the repaired pipe 11 is larger than the inner diameter of the manhole 10, the diameter of the pipe 12 to be repaired is large),
Since it is necessary to excavate a portion of the buried pipe 12, traffic regulations and the like are required, resulting in an increase in earthwork costs.

In addition, in the methods (b) to (b) above, a strip-shaped plate is continuously fed into the manhole while being made into a spiral pipe by a spiral pipe making machine installed inside the manhole.

Therefore, since a continuous spiral pipe is created inside the manhole, the trouble of mutually joining the pipes as in the case of repair pipes can be saved, but if the outer diameter of the spiral pipe is large (the diameter of the pipe to be repaired is large), the spiral pipe Since the pipe making machine is also large, excavation is required to install the pipe making machine, which poses a problem of increasing earthwork costs.

As described above, the repair methods using repair pipes and spiral pipes have a problem in that they are unsuitable for pipes to be repaired whose diameters are medium or larger.

(Means for Solving the Problems) The present invention involves carrying into a manhole a rectangular repair plate made of synthetic resin that is divided into a plurality of pieces in the circumferential direction according to the diameter of the pipe, and A repair cylinder is assembled by connecting the longitudinal edges of each repair plate with a gap between the inner circumferential surface and the gap, and the repair cylinders are connected in series and arranged over the entire length of the pipe. This method involves injecting a hardening filler.

(Example) Embodiments of the present invention will be described with reference to the drawings.

FIG. 2 shows a cross-sectional front view of a rectangular repair plate divided into a plurality of pieces in the circumferential direction so as to cover the inner circumferential surface of the pipe according to the diameter of the pipe to be repaired. is made of a synthetic resin material (for example, hard vinyl chloride resin), and its width is set to a size that allows it to be carried into the manhole, and its length is variable as appropriate, but is usually set to about 2 m.

On one side of the repair plate 1, a plurality of ribs 1a are formed to protrude in parallel to the width direction, and at both ends in the length direction, approximately mouth-shaped joints are formed in the same direction as the ribs 1a. 1b is protrudingly molded.

Then, as shown in FIG. 3, a mouth-shaped joint member 2 (made of synthetic resin material) is elastically fitted into each joint portion 1b of the adjacent repair plate 1 through a watertight backing 3. together,
It connects adjacent repair plates 1 to each other.

Next, a method of repairing a corroded pipe using the repair plate 1 will be explained.

(a) The necessary number of repair plates 1 divided according to the inner diameter of the manhole and the diameter of the pipe are carried into the manhole.

(b) A worker enters the pipe through the manhole and, as shown in Figure 1, places each repair plate 1 between the inner peripheral surface of the pipe 4 and the gap G, and so that the ribs 1a face the inner peripheral surface. Then, the joint member 2 is fitted to the joint portions 1b at both ends in the length direction via the backing 3, and assembled into a circular shape, thereby creating a repair cylinder serving as a first unit at the front of the tube 4.

(C) The worker moves to the rear of the repair cylinder of the first unit, and again performs the work in (c) above to create a repair cylinder that will become the subsequent second unit, and attaches the front edge of the cylinder to the previous one. 1
Glue it to the rear edge of the repair cylinder of the unit unit using adhesive or the like.

(d) Repeat the operations in (b) and (C) above to install repair cylinders connected in series over the entire length of the pipe 4.

(e) Install support piles 5 at multiple locations along the length of the continuous repair cylinder.

(f) A filler S such as cement milk that hardens over time is injected into the gap G.

Note that the filler S is injected in multiple units (for example, 2 to 3 units).
After assembling and joining the repair cylinder of the unit unit), the gap G between the repair cylinder and the pipe 4 at its front and rear ends is closed with a synthetic resin material (an injection hose is inserted into the gap G between the repair cylinder at the rear end and the pipe 4). (insert)).

(g) After the filler S hardens, the support pile 5 is removed.

In addition, in place of the joining member 2, the joining part 1 of each repair plate 1
b may be bonded with an adhesive, or in the case of a particularly large-diameter pipe 4, a wire mesh may be provided within the gap G to form a strong integral structure between the pipe 4 and the repair cylinder. is desirable.

(Effects) Since the present invention is a method of assembling repair plates that are divided into multiple pieces in the circumferential direction according to the diameter of the pipe to be repaired, within the pipe, (a) there is no need for excavation work as in conventional methods; It is possible to repair pipes of medium diameter or larger.

) Unlike conventional methods, it does not require the installation of a spiral pipe making machine,
Repair work can be carried out easily and repair costs are also low.

[Brief explanation of the drawing]

Fig. 1 is a detailed explanatory diagram of the present invention, Fig. 2 is an enlarged sectional side view of a repair plate, Fig. 3 is an enlarged sectional side view of a joint part of the repair plate, and Fig. 4 is an explanatory diagram of a conventional example. . DESCRIPTION OF SYMBOLS 1... Repair plate, 2... Joining member, 4... Pipe, 5...
...Support pile, G...Gap, S...Filling material.

Claims (1)

[Claims] A rectangular repair plate made of synthetic resin that is divided into a plurality of pieces in the circumferential direction according to the diameter of the pipe is carried into the manhole, and inside the pipe, the inner peripheral surface of the pipe and the gap are fixed. and then assemble a repair cylinder by connecting the longitudinal edges of each of the repair plates, connect the repair cylinders in series and arrange them over the entire length of the pipe, and inject a filler that hardens over time into the gap. A pipe repair method characterized by: