JPH0639129B2 - Perforation and sealing method for branch tube mouth closing membrane in inner hard tube lining stem - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a method for perforating and sealing a branch tube mouth closing membrane in an inner hard tube lining stem.

Conventional technology and its problems As a method of lining the inner surface of a conventional trunk tube, after inserting a hard tube having a smaller diameter than the tube over the entire length of the trunk tube, the tube is heated and pressurized from the inside to expand and line the tube inner surface. Various construction methods have been proposed. In the hard tube lining formed by applying this heating and pressure expansion method,
Due to the heat contraction that occurs after the heating and pressurizing expansion, a gap is inevitably formed between the main tube and the main tube. Therefore, in such a rigid tube-lined stem, when the perforation membrane of the branch canal is closed,
The perforation port and the above-mentioned gap are communicated with each other, which causes water leakage or gas leakage.

The present invention has been made for the purpose of providing a piercing and sealing method capable of simultaneously piercing a branch-tube mouth-occluding membrane and sealing the piercing opening.

Means for Solving the Problems The present invention, in a trunk pipe having a hard tube lining on the inner surface thereof, when a perforation membrane of a branch pipe mouth opening is perforated by a heating fusion type perforation head provided in an intraperforator, A metal mouthpiece having an outer diameter slightly smaller than the inner diameter of the branch pipe mouth is freely fitted and held in the perforating head, and the mouthpiece is provided with the perforating head together with the perforation head for melting and piercing the closing film by the perforating head. The melt from the occluding film, which is inserted into the inside of the pipe opening and caused by the melt perforation, is
Due to the difference in outer diameter, it flows into and fills the circumferential space between the two and is then solidified, and the molten solidified material is used to bond and integrate the die to the branch pipe mouth at the insertion position into the branch pipe mouth. The present invention relates to a method of perforating and sealing a branch tube mouth closing film in a characteristic inner hard tube lining trunk.

Examples The following examples of the method of the present invention will be described with reference to the accompanying drawings.

FIG. 1 to FIG. 4 show an example of implementation of the method of the present invention in the case where the perforation of the branch tube mouth block membrane and the sealing of the perforation mouth are performed in one step.

An in-pipe perforator (1) used for perforating a occluding membrane (c) that closes a pipe mouth (b ₁ ) of a branch pipe (b) attached to a trunk pipe (a) includes a perforating head (2), Closure membrane (c) by advancing the head (2) in the radial direction of the trunk pipe (a)
It is designed to be able to pierce.

Various structures have already been proposed as the pipe perforator (1) having such a structure. In the present embodiment, among the various known pipe perforators (1), a heat-melt type perforation is particularly preferable. A head having a head (2) is used.

The mouthpiece (3) is made of a metal such as aluminum or stainless steel, and the outer diameter of the mouthpiece (3) is slightly smaller than the bore diameter of the pipe mouth (b ₁ ) and the inner diameter. Has a diameter substantially equal to or slightly larger than the outer diameter of the boring head (2), and an outward flange portion (3a) (see FIGS. 2 to 4) is formed at the base end.

The mouthpiece (3) is carried into the trunk pipe (a) while being fitted and held in the boring head (2) of the boring machine (1) freely,
The perforation head (2) and the branch pipe mouth (b ₁ ) are aligned by a conventional method so that they are placed at positions corresponding to the above-mentioned pipe mouth (b ₁ ). This state is shown in FIG.

The perforation head (2) in which the mouthpiece (3) is fitted and held is of a heating and melting type and is provided with a heating mechanism (not shown), and the heating mechanism causes the perforation head (2) and the mouthpiece (3) to The temperature required for heating and melting the branch pipe / tube mouth closing film (c), for example, 150 to 150 when the closing film (c) is made of vinyl chloride resin.
It is heated to a temperature of about 200 ° C.

The heated piercing head (2) and the mouthpiece (3) are advanced in the radial direction of the main canal (a) in the state shown in FIG. 1, and as shown in FIGS. ) Is melted and perforated and enters the inside through the branch pipe port (b ₁ ). Melt (C ₁ ) is generated by the melt perforation of the closing film (c), and this melt (c ₁ ) is, as shown in FIG.
And the tube mouth (b ₁ ) are filled in the circumferential gap (4) between them caused by the difference in inner and outer diameters, and function as an adhesive for bonding the die (3) to the tube mouth (b ₁ ) portion. When heating to the perforating head (2) is stopped in the state shown in FIG. 3, the melt (c ₁ ) is solidified by natural cooling, and the die (3)
Is fitted and fixed to the tube mouth (b ₁ ) portion. After fitting and fixing the mouthpiece (3), the drilling head (2) is withdrawn in the radial direction of the pipe,
By removing from the base (3), it is possible to prepare for the next operation.

As shown in FIG. 4, the die (3) fitted and fixed to the pipe mouth (b ₁ ) portion has a function of adhering the melt (c ₁ ),
Since it is firmly adhered to the tube mouth (b ₁ ), a stable and reliable adhesive fixed state can be obtained. In order to make this adhesively fixed state more stable, a rough surface (3b) can be formed on the outer peripheral surface of the die (3) and / or a primer treatment can be performed.

As shown in FIG. 4, by fitting and fixing the base (3) to the pipe mouth (b ₁ ) portion, a gap (e) generated between the trunk pipe (a) and the hard tube lining (d) is sealed. Therefore, it is possible to prevent water leakage and gas leakage more than the gap (e).

Effect According to the method of the present invention, in the inner hard lining stem pipe, it is possible to simultaneously perform the perforation of the branch duct mouth occluding membrane and the sealing of the perforation mouth, even when performing both operations individually,
The construction period can be shortened and the construction cost can be reduced.

[Brief description of drawings]

FIG. 1 is an overall view showing one embodiment of the method of the present invention,
FIG. 4 is an explanatory view showing the sealing method in the order of steps. In the figure, (1) is a pipe construction machine, (2) is a drilling head,
(3) is a base.

Claims (1)

[Claims] 1. A trunk pipe having a hard tube lining on the inner surface thereof, wherein when a branch pipe mouth-closure membrane is perforated by a heating and melting type perforation head provided in an intra-perforation machine, the branch pipe is preliminarily provided in the perforation head. A metal mouthpiece having an outer diameter slightly smaller than the inner diameter of the mouth is freely fitted and held, and the mouthpiece is inserted into the inside of the branch pipe mouth together with the perforation head as the perforation head melts and perforates the closing film. However, the melt generated from the occluding film due to the melt perforation flows into and fills the circumferential gap between the mouthpiece and the branch pipe due to the difference in the inner and outer diameters, and is then solidified. A method for piercing and sealing a branch tube mouth closing film in an inner hard tube lining trunk, characterized in that the mouthpiece is adhesively integrated with the branch tube mouth at a position of insertion into the branch tube mouth.