JPS63194929A - Leak-prevention process of buried sewer pipe - Google Patents

Abstract

PURPOSE:To prevent a buried sewer pipe from leaking by a method wherein the pipe is lined by reversingly inserting a tube, and sealing rings are fixed in the predetermined positions of the pipe by means of the lining tube. CONSTITUTION:A tube 5 is inserted in a pipe (a) by being turned inside out with a reverser 6 in use of fluid pressure so as to be integrally bonded onto the inner surfaces of the pipe (a) by means of adhesive, which is applied to the tube 5 in advance. By the lining of the tube 5, sealing rings 2 are fixed in the predetermined positions of the pipe (a). Since each of said fixed sealing rings 2 is made of swelling rubber, it expands in its volume by contacting with water penetrating through a joint (b) [or (c)], resulting in so strongly and pressingly fixing to the inner surface of the pipe (a) as to be able to satisfactorily withstand the underground water pressure and to stably and surely prevent over a long period of time the leakage through the joints (b) and (c) from occurring.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a method for preventing leakage of buried sewer pipes.

Conventional technology and its problems Conventionally, as a leakage prevention method for underground sewer pipes, especially relatively small-diameter pipes where workers cannot work inside the pipe, a sealing material is held in a pipe construction machine and brought to the leakage point in the pipe, and then A water leakage prevention method has been proposed in which a pipe construction machine is operated to fix and fix a sealing material to the leakage location. This conventional construction method using pipe construction machines does not require road excavation, and has the advantage of saving road excavation costs, supplementary training costs, etc., as well as not interfering with road traffic. Fixation work naturally has its limits, and fixation tends to become unstable and uncertain, especially when the groundwater level and groundwater pressure are high, such as during rainy seasons. There was a problem that made it impossible.

The present invention has been made with the aim of eliminating such conventional problems.

Means for Solving the Problems The present invention temporarily attaches a seal ring made of swollen rubber to the inner surface of a leaking point in a buried sewer pipe using an in-pipe construction machine, and then inserts the tube into the pipe while being reversed. The present invention relates to a method for preventing water leakage of a buried sewer pipe, characterized in that the seal ring is lined and fixed to a predetermined position inside the pipe by means of the lining retubing.

Function: In the construction method of the present invention, the seal ring temporarily attached to the inner surface of the buried sewer pipe by using an in-pipe construction machine is stably and securely fixed in a predetermined position by the tube lined in the upper trachea. In addition, the seal ring is made of swelling rubber and expands in volume when it comes into contact with water, and is strongly pressed against the inner surface of the pipe, so even if groundwater pressure becomes high, it can sufficiently resist this and maintain high altitude. The water leakage prevention function can be maintained for a long period of time. Furthermore, the temporary attachment of the seal ring and the inversion and lining of the tube can both be done using the manhole area, so there is no need to excavate the road at all, making water leakage prevention work efficient, inexpensive, and less of a hindrance to road traffic. It can be done without becoming.

EXAMPLE An example of the construction method of the present invention will be described below based on the accompanying drawings.

Figure 1 shows the underground water pipes (a) before the construction of water leakage prevention works.
) is schematically shown, and the joint part (b) between the main pipes and the joint part (C) between the main pipe and the branch pipe (a, ) are shown as water leakage points, respectively.

When performing water leakage prevention work on the pipe (a) by applying the construction method of the present invention, first, as shown in Fig. 2, the pipe (a) is Seal rings (2) are temporarily attached to the joint parts (b) and (c), respectively. The seal ring (2) is made of swelling rubber, and expands in volume by, for example, about 150 to 200% when it comes into contact with water. Such swollen rubber itself is well known and can be easily obtained as a commercial product.

The seal ring (2) has a diameter corresponding to the inner diameter of the pipe (a).
As shown in FIGS. 5 and 6, the pipe construction machine (
1) and brought to a predetermined location within the tube (a). As shown in Fig. 2, the Jokin pipe construction machine (1) is equipped with a rubber bag (1a) that is inflated and stored by supplying and discharging compressed air from a ground-mounted compressor (3). The expansion of the bag (1a) restores the seal ring (2) held in the rubber bag (1a) from its deformed state to its original shape, so that the seal ring (2) is inserted into the tube (
a) It can be temporarily attached to a predetermined location. After temporary attachment, by deflating the rubber bag (1a), the pipe application machine (1) can be removed from the pipe while leaving the seal ring (2) inside the pipe. This type of pipe construction machine (
1) It is publicly known.

An example of temporary attachment means is shown in FIG. 5-a, and includes a seal ring (
2) is an adhesive layer (2a) (2a) provided on its outer peripheral surface.
), the two adhesive layers (2a) are adapted to be temporarily attached to the inner surface of the tube (a) by means of a sealing ring (2);
They are provided, for example, at both ends of the outer peripheral surface of the ring (2) so as not to prevent contact with water that has entered from the joint portion (b) or (c).

Other temporary attachment means include, as shown in FIG. 6, a metal thin plate, such as an aluminum thin plate, which can be bent and deformed freely and restrained in any bending deformation state, as shown in FIG. (2b) Preferably, a method of attaching the material in a seamless ring shape may be employed. Seal ring (2
) may be temporarily attached to an extent that does not cause displacement when the tube is reversed and lined in the next step, and other appropriate temporary attachment means such as pressing with a spring may be used. In Figure 2, (4) is for confirming the location of water leakage.
This is a television camera vehicle equipped with the pipe construction machine (1).

After temporarily attaching the seal rings (2) to the joint parts (b) and (C) of the tube (a) as shown in Figure 2, the tube (5) is inverted and lined on the inner surface of the tube (a). be done.

Figure 3 shows the inverted lining situation of the tube (5), where the tube (5) is inserted into the tube (a) while being inverted by the inverter (6) using fluid pressure, and the tube (5) is pre-coated. It is bonded and integrated with the inner surface of the tube (a) using an adhesive (not shown) applied thereto.

The inversion lining construction method for such a tube (5) itself is well known, and various known inversion lining construction methods can be employed.

The lining of the tube (5) fixes the seal ring (2) at a predetermined location within the tube (a), as shown in FIG. 4. This fixed seal ring (2)
is made of swollen rubber, so the joint part (b
) (or (C)) and expands in volume, strongly presses against the inner surface of the pipe (a), can sufficiently resist groundwater pressure, and prevents water leakage from the joints (b) and (c). It can be stably and reliably prevented over a long period of time.

When the tube (5) expands when the seal ring (2) expands in volume, the expansion pressure of the seal ring (2) escapes and the pressure against the inner surface of the tube decreases. It is preferable to use a tube that does not substantially stretch, such as a tube. In particular, as shown in Fig. 7, when the tube (5) is laminated with fibers such as felt, and this fibrous layer (5a) is impregnated with adhesive and is invertedly lined on the inner surface of the tube, the adhesive After curing, the fibrous layer (5a) is formed to impart shape retention to the tube (5). This shape-retaining property is advantageous because it can firmly support the reaction force when the seal ring (2) expands in volume. As the adhesive impregnated and retained in the fibrous layer (5a), various known reaction-curing adhesives consisting of a main ingredient and a curing agent are used.

As shown in Figure 4-a, the mouth of the branch pipe (al) is closed by the seal ring (2) and the lining retube (5), so the closed part (a+') will be removed after the construction is completed. , the tube is perforated and unsealed using a known intrapipe perforator (not shown).

Effects In the construction method of the present invention, the seal ring is fixed and fixed at a predetermined location inside the pipe by the inverted lining of the tube, so the pipe installation machine can simply temporarily attach the seal ring to the predetermined location inside the pipe. It can considerably reduce the burden of pipe work by construction machines and improve workability.

Furthermore, the seal ring is not only stably and securely fixed in a predetermined location within the pipe by the inverted lining tube, but also made of swelling rubber, which expands in volume when it comes into contact with infiltrating water, forming a strong seal against the inner surface of the pipe.
Because it is crimped, it maintains a high degree of water leakage prevention function for a long period of time, and has the feature of stably and reliably preventing water leakage from the joint even when groundwater pressure is high, such as during the rainy season or during rainfall. have

[Brief explanation of the drawing]

Figures 1 to 4 are explanatory diagrams showing the implementation status of the construction method of the present invention in the order of steps, Figure 4-a is a cross-sectional view showing the blocked state of the branch pipe opening, and Figure 5 is the deformation of the seal ring. 5-a is a sectional view showing the state of formation of the adhesive layer; FIG. 6 is a sectional view showing another example of the seal ring and its deformation state; FIG. 7 is a preferred example of the tube. FIG. In the figure, (1) is a pipe construction machine, (2) is a seal ring, (3) is a compressor, (4) is a TV camera vehicle, (
5) is a tube. (That's all) Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] (1) Temporarily attach a seal ring made of swollen rubber to the inner surface of the leakage point of the buried sewer pipe using a pipe installation machine, then insert the tube inside the pipe inverted and line it, and use this lining tube to A method for preventing water leakage in a buried sewer pipe, characterized by fixing the seal ring at a predetermined location within the pipe.