JPH0351956B2 - - Google Patents

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 (e.g. epoxy resin) onto the corroded surface of the pipe.

(b) A method in which a synthetic resin product (for example, a molded product made of hard vinyl chloride resin material) is inserted into a pipe to form a double pipe, and the above products include: (a) A product 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 uniformly finish the repair material in a bad working environment, and it also reduces the amount of waste generated from the repair material. 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.

In addition, in the methods (b) to (a), as shown in FIG. The required number of repair tubes 11 connected in series are installed in the tube 12 by sequentially joining the repair tubes 11 and the front end circumferential surfaces of the subsequent repair tubes 11 and feeding them into the front of the tube 12.

Therefore, if 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), it is necessary to excavate a part of the buried pipe 12, so traffic regulations etc. are necessary. This resulted in the problem of high earthwork costs.

In addition, in the methods (b) to (b) above, a strip-shaped plate is continuously fed into the manhole while being fed into the pipe while forming a spiral pipe using 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 the repair pipe can be saved, but if the outer diameter of the spiral pipe is large (the diameter of the pipe to be repaired is large), Since the spiral pipe making machine is also large, it requires excavation to install the pipe making machine, which poses the 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 peripheral surface 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.

Therefore, one side of the repair plate 1 has a plurality of ribs 1a.
are formed to protrude parallel to the width direction, and approximately U-shaped joint portions 1b are formed to protrude from both lengthwise ends in the same direction as the ribs 1a.

As shown in FIG.
A U-shaped joining member 2 (made of a synthetic resin material) is elastically fitted through the joint member 2 to connect 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 Fig. 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. and the joint portions 1b at both ends in the length direction.
Then, the joining member 2 is fitted through the packing 3 and assembled into a circular shape, thereby creating a repair cylinder serving as a first unit in front of the pipe 4.

(c) The worker moves to the rear of the repair cylinder of the first unit, again performs the work in (b) above to create a repair cylinder that will become the subsequent second unit, and cuts the front edge of the cylinder. The repair cylinder is bonded to the rear end periphery of the first unit body using an adhesive or the like.

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

(e) Install supports 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 filling material S is injected by closing the gap G between the repair cylinder and the pipe 4 at the front and rear ends with a synthetic resin material after assembling and joining multiple units (for example, 2 to 3 units) of the repair cylinder. (inserting the injection hose into the gap G between the repaired cylinder and the pipe 4).

(g) After the filler S has hardened, remove the support 5.

Note that instead of the joint portion 2, the joint portion 1b of each repair plate 1 may be bonded with an adhesive, and especially in the case of a large-diameter pipe 4, a wire mesh may be placed in the gap G. It is desirable to arrange the tube 4 and the repair cylinder to form a strong integral structure.

(Effects) The present invention is a method for assembling repair plates that are divided into a plurality of pieces in the circumferential direction according to the diameter of the pipe to be repaired. It is possible to repair pipes larger than the caliber.

(b) Unlike the conventional method, it is not necessary to install a spiral pipe making machine, and repair work can be carried out simply and easily, and repair costs are also low.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of an embodiment 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. be. 1...Repair plate, 2...Joining member, 4...Pipe, 5
...Support, G...Gap, S...Filling material.

Claims (1)

[Scope of Claims] 1. A rectangular repair plate made of synthetic resin, which 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 repair plate is inserted into the inner peripheral surface of the pipe and the gap. and assemble a repair cylinder by connecting the longitudinal edges of each of the repair plates, connecting the repair cylinders in series and disposing them over the entire length of the pipe, and filling the gap with a filler that hardens over time. A pipe repair method characterized by: injecting.