JPH01257013A - Inner surface-lining process of existing tube having branching tube - Google Patents

Abstract

PURPOSE:To repair simply the existing tube with a branching tube by a method in which the short tube fitted with a pad is arranged in an existing tube, and its through-hole is caused to coincide with the branching port of the existing tube, and then a plurality of short tubes are connected to the short tube, and further by expanding the pad, the gap between the branching port of the existing tube and the connected tube is sealed closely. CONSTITUTION:An opening port 53 is provided on the tube wall of the short tube 5 in a plurality of short tubes 5 constituting a connected body 2, and the short tube is held on the part of the branching port 11 of the existing tube 1 to which a branching tube 3 is connected. The hollow pad 6 with a through-hole 61 is fitted to the short tube 5, while the through-hole 61 is registered onto the opening port 52. Filler C is injected into the pad 6 through a tube 63, thereby sticking closely the periphery of the branching port 11 of the existing tube 1 to the outer surface of the short tube-body 5. A tube 8 is inserted into the connected body 2, and the tube 8 is brought in rigid state by its expansion. Necessary amount of filler D is injected into a gap S, whereby the connected body 2 is floated in the existing tube 1 and is concentrically arranged. After curing of the filler, filler D is injected into the remaining gap S, and the connected body 2 is held concentrically in the existing tube by curing the filler D.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for internally lining an existing pipe having a branch port for a branch pipe, such as an aging sewer pipe.

[Conventional technology]

As a measure to extend the service life of aging existing pipes that have internal corrosion or cracks, a method of internally lining the existing pipes has traditionally been adopted. One of these methods is to hold a long connector made of short pipes together inside an existing pipe, and use the internal passage of the connector as a new passage.

On the other hand, when a branch pipe such as a drainage pipe is connected in the middle of an existing pipe, conventionally, after excavating the buried part of the existing pipe, the existing pipe with the branch pipe is replaced with a new pipe, or The branch pipe section was excavated and only this section was replaced with a new pipe.

[Problem to be solved by the invention]

However, in the conventional inner lining method using a connecting body, if a branch pipe is connected to an existing pipe, the branch pipe does not communicate with the internal passage of the connecting body. It was not suitable for cases where Additionally, there was a problem in that the construction work to replace aging existing pipes would be large-scale work as it would involve excavation of the ground.

Therefore, there has been a long-awaited method for further developing the above-mentioned internal lining method to internally line existing pipes with branch pipes.

The present invention has been made in view of the above circumstances, and is an existing pipe with a branch pipe in which the internal passage of a connecting body held in an existing pipe and a branch pipe connected to the existing pipe are communicated by a simple means. It is an object of the present invention to provide a method for lining the inner surface of a pipe.

[Means to solve the problem]

The method for lining the inner surface of an existing pipe with branch pipes according to the present invention includes:
An opening is formed in the tube wall of at least one of the plurality of short tubes constituting the connecting body, and a hollow flexible pad having a through hole is positioned in the short tube with the through hole located in the opening. Place the short pipe with the pad attached inside the existing pipe, align the through hole with the branch port of the existing pipe, and connect multiple other short pipes to the short pipe. forming a connecting body, and sealing the gap between the pipe wall around the branch port of the existing pipe and the connecting body by inflating the pad by pressurizing fluid or filler into the pad. After this, the connecting body is held in the existing pipe.

[For production]

According to the present invention, the internal passage of the connecting body held by the existing pipe is communicated with the branch pipe through the branch port of the existing pipe.

〔Example〕

Figure 1 shows a connecting body 2 inside an existing pipe 1 with a straight branch pipe.
is shown in the deployed state. There are various types of existing pipes 1 that are subject to inner lining by the connecting body 2, such as sewer pipes made of humid pipes buried underground and discharge pipes for factory waste liquid, and branches connected to the existing pipes 1. Pipe 3 includes a drain pipe for domestic gray water, etc. Before installing the connecting body 2, the inner surface of the existing pipe 1 is washed by appropriate means such as jetting water, and solid foreign matter inside the pipe is removed in advance. 4.4 is a manhole.

The connecting body 2 includes a plurality of short pipes 5 sequentially inserted from a manhole 4.
... are often constructed by connecting them inside the existing pipe 1, but it is not necessarily necessary to connect them inside the existing pipe 1. ), the short pipes 5 may be connected to form a connecting body 2, and the connected body 2 may be inserted into the existing pipe 1 from one end side. A seal ring (not shown) having elasticity is connected to the socket 51 by inserting the socket 52 of another short pipe 5 into the socket 51. It is configured to maintain the necessary liquid tightness by being pressed against the inlet 52 inserted into the pipe 1, and its outer diameter is set to be slightly smaller than the inner diameter of the existing pipe 1.

Among the plurality of short pipes 5 constituting the connecting body 2, the branch pipe 3
The part of the branch port 11 of the existing pipe 1 that communicates with the
There is an opening 5 in the pipe wall of the short pipe 5 held at the connection point a).
3 (see Figures 8 and 9) has been established. Also,
A hollow pad 6 having a through hole 61 is attached to the short tube 5 with the through hole 61 aligned with the opening 53. FIG. 7 shows an example of the pad 6, which is made of a flexible material such as a flexible synthetic resin sheet, canvas, or fabric sheet impregnated or coated with neoprene rubber, resin, etc. The tube for press-fitting the filler material is shown. The pad 6 can be attached to the tube 5 by, for example, binding the pad 6 to the tube 5 using a tightening band 62 as shown in FIG. A method such as bonding with a chemical agent can be adopted.

The short pipe 5 equipped with the pad 6 may be placed inside the existing pipe 1 either before or after the connecting body 2 is constructed. However, it is most desirable to first insert the short pipe 5 having the pad 6 into the branch port 11 of the existing pipe 1, and then connect the branch port 11 and the through hole 61 (opening 53).
It is preferable to arrange them so that they match, and then connect a plurality of short pipes 5... in front and behind them.

After placing the short pipe 5 with the pad 6 attached inside the existing pipe 1, when fluid or filler C is press-fitted through the tube 63 into the pad 6, the pad 6 swells as shown in FIGS. 8 and 9. It is in close contact with the inner surface of the tube wall around the branch port 11 of the existing pipe 1 and the outer surface of the tube body 5, and the gap therebetween is sealed. As the fluid C, a liquid such as water, air, etc. is used, and as the filler C, cement milk, air mortar, hardening synthetic resin, etc. are used. preferable. Note that when using the fluid C, the area around the branch port 11 of the pad 6 may be bonded. The work of sealing the area around the branch port 11 in this manner may be performed before or after the connecting body 1 is constructed. The hardening type filler C filled in the pad 6 is then naturally hardened or heated.

After sealing the area around the branch port 11 with the pad 6, the tube 8 is inserted into the connecting body 2 placed inside the existing pipe 1 as shown in Fig. 2, and the tube 8 is inflated by air pressure or water pressure to become a rigid body. let In this way, tube 3
This has the advantage that even if the connection point between the short pipes 5, 5 is bent, it is straightened, and there is no place in the internal passage of the connection body 1 that shows an upward slope. Air or water may be supplied to the tube 3 from the ground. In addition, 7,7 is tube 8
The holder is shown.

The connecting body 2 arranged inside the existing pipe 1 is held by the existing pipe 1. In order to hold the connecting body 2 to the existing pipe 1, it is necessary to inject a filler such as cement milk, air mortar, or adhesive into the gap S between the existing pipe 1 and the connecting body 2, but the existing pipe Since the connecting body 2 disposed inside the tube 1 is placed on the bottom surface of the existing pipe 1 as shown in FIG. 1, the gap S is wider at the upper part, and there is almost no gap at the lower part.

Therefore, if the filler is put into 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. In this example, the connecting body 2 is a lightweight one made by connecting short pipes made of FRP.

First, as shown in FIG. 4, by press-fitting a required amount of filler material into the gap S, the connecting body 2 is floated on top of the filler C inside the existing pipe 1, and the connecting body 2 is placed concentrically with the existing pipe 1. After the filler C has hardened, filler material is compressed into the remaining gap S, and the filler material is hardened to form the connecting body 2 as shown in FIG.
are held concentrically with the existing pipe 1. In this way, filler C
If you fill the tube twice, there is a concern that the second filling will cause the connecting body 2 to rise further. By adding the weight of the water W injected into the tube 3, it is possible to prevent the connecting body 2 from floating up.

Note that, as shown in FIG. 3, the connecting body 2 may be temporarily held concentrically with the existing pipe 1 by interposing a spacer 9 in the gap S before injecting the filler material.

Although the embodiments described above relate to the case where a straight connecting body 2 is lined on the inner surface of an existing pipe 1 with a straight branch pipe, the present invention is applicable to the case where an existing pipe with a branch pipe installed in a curved manner is lined with the inner surface. The same applies to

〔Effect of the invention〕

As described above, according to the present invention, when an existing pipe with a branch pipe is internally lined, the new passage formed by the connecting body forming the lining layer is communicated with the branch pipe.
It is now possible to easily repair existing pipes with branch pipes without having to excavate the buried location of the existing pipes as in the past.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal side view showing the state in which the connecting body is installed inside the existing pipe, and Fig. 2 is the state in which the pad is inflated.
Figures 3 to 6 are longitudinal sectional front views showing a series of steps from disposing the connecting body inside the existing pipe to holding the connecting body in the existing pipe, Figure 7 is a schematic perspective view illustrating the pad, and Figure 7 is a schematic perspective view illustrating the pad. 8 is an enlarged longitudinal sectional side view of the main part of FIG. 2, and FIG. 9 is an enlarged longitudinal sectional front view of the main part of FIG. 2. ■... Existing pipe, 2... Connector, 3... Branch pipe, 5...
... Short pipe, 6... Pat, 11... Branch, 53.
...Opening, 61...Through hole, A...Connection point, C.
...Curing filler, S...Gap. Patent applicant Takiron Co., Ltd. Figure 2 Figure 3 □ Figure 4 Figure 7 Figure 8

Claims (1)

[Claims] 1. A lining method for holding a plurality of short pipe connections in an existing pipe having a branch port for a branch pipe, the method comprising at least one
forming an opening in the pipe wall of one short tube, and attaching a hollow flexible pad having a through hole to the short tube with the through hole aligned with the opening; Arranging the pipe inside the existing pipe, aligning the through hole with the branch port of the existing pipe, and connecting a plurality of other short pipes to the short pipe to form a connected body, and filling the pad with fluid or filling. The gap between the pipe wall around the branch port of the existing pipe and the connecting body is sealed by press-fitting the material and inflating the kit, and after this, the connecting body is held in the existing pipe. A method for lining the inner surface of an existing pipe with branch pipes.