JPH01255778A - Internal surface lining method for existing pipe - Google Patents

Abstract

PURPOSE:To prevent deformation of a concatenated body for lining the internal surface of an existing pipe by forming a tube inserted into the concatenated body held inside the existing pipe into a rigid body to support the concatenated body, filling the gap between the internal surface and the wall of the concatenated body with filler material and allowing the filler material to cure, thereafter removing the tube. CONSTITUTION:A concatenated body 2 consisting of short pipes 5 is inserted into an existing pipe 1 such as Hume pipe, etc. A tube 3 is insert ed into the concatenated body 2, and air or water is fed into the tube 3 to expand and form the tube into a rigid body. The wall of the concatenated body 2 is backed up from the inside by the rigid tube 3. After that, a fluid filler material is injected into a gap formed between the existins pipe 1 and the concatenated body 2, and the tube 3 is removed after the filler material has cured. Since the cured filler material has a self-supporting property, deformation of the concatenated body due to the weight of the filler material can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for internally lining existing pipes such as aged sewer pipes.

[Conventional technology]

As a measure to extend the useful life of aging existing pipes that have internal corrosion or cracks, one way to do this is to line the existing pipes with an internal lining made of synthetic resin, such as FRP. After inserting a long connector made by connecting short pipes made of reinforced plastic into the existing pipe, fill the gap formed between the existing pipe and the connector with a filler such as a cement mill. There is a method in which the internal passage of the connecting body is used as a new passage by holding the connecting body to the existing pipe via the connecting body.

In such an inner surface lining method, after an uncured filler is injected into the gap, a load due to the weight of the filler is applied to the connecting body until the filler hardens. Therefore, the connecting body needs to have enough strength not to be deformed by the load.

Therefore, conventionally, the required strength required for the connecting body has been ensured by increasing the thickness of the tube wall of the short tube.

[Problem to be solved by the invention]

By the way, although the lining layer formed on the existing pipe by the above-mentioned method has a two-layer structure of the filler and the pipe wall of the connecting body, the filler itself becomes shape-retaining as it hardens. The load due to the weight of the material is no longer applied to the connecting body. As a result, if only the state after the filler has hardened is considered, it is not necessary to make the wall of the connecting body, that is, the wall of the short pipe, so thick.

However, conventionally, as mentioned above, the thickness of the pipe wall of the connecting body is increased to prevent the connecting body from being deformed by the load due to the weight of the filler until the uncured filler hardens. As a result, after the filler hardens, the Pl of the pipe wall of the connecting body becomes thicker than necessary, which leads to increased cost and weight, leading to poor workability. This tendency becomes more pronounced as the diameter of the connector increases.

The present invention has been made in view of the above circumstances, and provides an inner lining for existing pipes in which the connecting body will not be deformed by the weight of uncured filler even if the pipe wall of the connecting body is made thin. The purpose is to provide a method.

[Failure to solve the problem]

The method of lining 1 m of an existing pipe according to the present invention involves inserting a flexible tube into a connecting body inserted into the existing pipe, feeding fluid into this tube to make it rigid, and using the rigid tube to line the connecting body. The pipe wall is backed up from the inside, and in this state, an uncured filler is put into the gap formed between the existing pipe and the connecting body, and after the filler has hardened, the tube is removed.

[Function] According to this method, the load due to the weight of the uncured filler injected into the gap between the existing pipe and the connecting body is substantially supported by the rigid tube. Further, when the filler hardens, the filler itself has shape-retaining properties, so even if the tube is removed, the connecting body will not be deformed by the weight of the filler.

〔Example〕

Figure 1 shows a state in which the connecting body 2 is installed inside a straight existing pipe l, and Figure 2 shows a state in which fluid pressure is applied to the tube 3 inserted into the connecting body 2 to make the tube 3 a rigid body. It shows.

There are various types of existing pipes 1 that are subject to internal lining by the connecting body 2, such as sewer pipes made of humid pipes buried underground and discharge pipes for factory waste liquid, and as shown in the figure, the pipes are When manholes 4, 4 are provided in the middle, various operations such as short pipe insertion and duplex insertion, which will be described later, can be easily performed using the manholes 4, 4 without excavating the existing pipe 1. The inner surface of the existing pipe l is equipped with the above-mentioned connecting body 2.
Before IF, it is washed by appropriate means such as spraying a jet of water, and any solid foreign matter inside is removed in advance.

The connecting body 2 is a plurality of short pipes 5 inserted from a manhole 4.
・ is often constructed by connecting them inside the existing pipe 1, but it is not necessarily necessary to connect them inside the existing pipe I, and in some cases, it is possible to connect them outside the existing pipe I (for example, at a construction site or factory). The pipes 5 may be connected to form a connecting body 2, and the connecting body 2 may be inserted into the existing pipe 1 from one end side. As shown in FIG. 7, the illustrated short pipe 5 has a socket 5I on one end and a lid 52 on the other end, and is connected by inserting the lid 52 of another short pipe 5 into the socket 51. The elastic seal ring 6 held in the socket 51 is connected to the socket 51.
It is configured to be in pressure contact with the lid opening 52 inserted into the lid opening 52 to maintain necessary liquid tightness.

A tube 3 is inserted into the connecting body 2 arranged inside the existing pipe I, for example, in a flatly folded state.
Inflate as shown in the figure and use air or water pressure to make it rigid. Alternatively, the tubes 3 may be sequentially inserted into the connecting body 2 while being reversed by fluid pressure to become a rigid body. and,
The tube wall of the connecting body 2 is backed up from the inside with a rigid tube 3. After this, the existing pipe 1 and the connecting body 2
An uncured filler is injected into the gap S formed between the tube and the tube, and after the filler is cured, the tube is removed. In this way, since the load due to the weight of the uncured filler injected into the gap S is substantially supported by the rigid tube 3, the tube wall of the connecting body 2, that is, the tube of the short tube 5 Even if the wall is made thin, the tube wall will not be deformed by the above load. Further, after the filler hardens, the filler itself has shape retention properties, so even if the tube 3 is removed, the connecting body will not be deformed by the load due to the weight of the filler.

Since the tube 3 substantially receives the load of the filler material as described above, it is necessary to maintain a high fluid pressure.

Therefore, as the material for the tube 3, glass fiber non-woven fabric impregnated with neoprene rubber, organic fiber cloth impregnated or coated with resin, rubber, etc., cloth sandwiched with resin, rubber, etc. are used. It is preferable. Further, the tube 3 is inserted into the connecting body 2 using the manhole 4, and its both ends are positioned (preferably) by predetermined holders 7, 7. Also, the supply of air or water to the tube 3 is This can be done from the ground.In order to apply a predetermined air pressure or water pressure to the tube 3, it goes without saying that the tip 31 of the tube 3 is closed.

By the way, since the outer diameter of the short pipe 5 is set to be slightly smaller than the inner diameter of the existing pipe 1, the mutually connected short pipes 5, 5
Even though the existing pipe 1 is straight, as shown in FIG.
Sometimes they are connected straight, sometimes they are not. Such bending at the connection point will occur relatively noticeably if the existing pipe 1 is an old pipe and there are irregularities or solid matter that has not been washed away on the inner surface of the pipe. And short pipe 5
, 5 are curved, for example, when water is flowed in the direction of arrow A in the figure, a part showing an upward slope may be formed in the middle of the pipe. Such bending at the connection point similarly occurs when short pipes are connected using a connection structure other than that shown in the drawings, for example, when short pipes are connected using a joint.

However, according to the method of the present invention, the curvature at the connection point is naturally corrected in the following manner. That is, in the process of inflating the tube 3 inserted into the connecting pipe 2 with air or water pressure to make it a rigid body, the tube 3 forcibly displaces the short tube 5.5 to follow the tube 3, as shown in FIG. The connection points between the short pipes 5.5 that are bent as shown in the figure are straightened.

The new passage formed by the above method has no deformed parts on the pipe wall of the connecting body 2, and there is no upward slope on the way, so sewage, waste liquid, etc. can flow smoothly, and the solid content contained therein It is also difficult for the accumulation of The short tube 5 is made of a hardening filler such as an FR adhesive made by impregnating a reinforcing material such as glass fiber with an unsaturated polyester resin. Since the connecting body 2 installed inside the existing pipe 1 is placed on the bottom surface of the existing pipe 1 as shown in FIG. become. Therefore, if an uncured filler is placed in the gap S in this state, there will be a problem that the filler will not be uniformly placed around the connecting body 2. An example of means for resolving such inconveniences will be described next. Note that in this example, the connector 2
A lightweight one made by connecting short FRP tubes is used.

First, as shown in Fig. 4, a filling material 6□ thicker than FRP, ゎゎ71-5 A, is press-fitted into the above-mentioned gap S, the cement is hardened, and the second filling is performed as shown in Fig. 6. There is a concern that the connecting body 2 will float further, but this can be solved, for example, by leaving the tube 3 inserted through the connecting body 2 as it is and adding the weight of the water W injected into this tube 3. It is possible to prevent floating.

Although the embodiments described above are for the case where a straight connecting body 2 is lined on the inner surface of a straight existing pipe 1, the present invention is equally applicable to the case where the inner side is lined with an existing pipe that is laid in a curved manner. . The tube used in this case needs to bend into the same shape as the existing tube when inflated by fluid pressure.

〔Effect of the invention〕

According to the present invention, while the filler is uncured and has no shape retention property, even if a load due to the weight of the filler is applied to the tube wall of the connecting body, the tube wall is backed up by the rigid tube. It will no longer deform.

Therefore, it is possible to make the tube wall of the connecting body thinner,
The material of the short tube constituting the connecting body, for example, reinforced plastic material such as FRP, can be reduced, resulting in cost reduction. Furthermore, the short pipe can be made lighter, making it easier to insert into existing pipes, and easier to transport.

In addition, by inserting the tube into the connecting body and then supplying fluid to make it rigid, the bending angle of the connecting point of the short pipes that make up the connecting body can be properly corrected. There is also the advantage that there are no places showing an upward slope from the passage.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional side view showing the state in which the connecting body is installed inside the existing pipe, Figure 2 is a longitudinal side view showing the state in which the tube inserted into the connecting body is made rigid by applying fluid pressure, and Figures 3 to 6 are FIG. 7 is a vertical sectional front view showing a series of steps from deploying the connecting body inside the existing pipe to holding the connecting body in the existing pipe; FIG. 7 is an enlarged vertical sectional side view showing the bending points of the connecting body; The figure is an enlarged longitudinal sectional side view showing a state in which the bending angle of the connecting body has been corrected. 1... Existing pipe, 2... Connecting body, 3... Tube,
5...Short tube. Patent applicant Takiron Co., Ltd. Figure 3 Figure 4 q Figure 5 Figure 6 Figure 7 Figure 8

Claims (1)

[Claims] 1. A method for lining an existing pipe in which a connecting body of a plurality of short synthetic resin tubes is held in an existing pipe, and a flexible tube is inserted into the connecting body inserted into the existing pipe, and the tube is lined with a flexible tube. Injecting fluid to make it rigid, backing up the pipe wall of the connecting body from the inside with the rigidized tube, and in this state, inserting an uncured filler into the gap formed between the existing pipe and the connecting body, A method for lining the inner surface of an existing pipe, characterized in that the tube is removed after the filler has hardened.