Electric heating – Heating devices – With heater-unit housing – casing – or support means
Patent
1988-04-19
1989-11-21
Walberg, Teresa J.
Electric heating
Heating devices
With heater-unit housing, casing, or support means
219277, 219535, H05B 354
Patent
active
048824704
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a boring device for a lining material having been applied onto the inner surface of a pipe line having a branched portion, which device can bore the lining material in the branched portion to communicate the branched pipe line to the main pipe line, and more particularly, to a boring device which is inserted from the branched pipe line having a smaller diameter and to the branched portion where the lining material is bored.
2. Description of the Prior Art
In general, a lining treatment for pipe lines, chiefly those buried in the ground, such as gas conduits and city water pipe lines, is carried out for the purpose of repairing or reinforcing the pipe lines.
As a method for lining, there is known a method which is carried out in such a manner that a tubular lining material made of a flexible material, which has been provided on the inner, leading surface thereof with a binder, is annularly fixed at one end thereof and fluid pressure is applied to the back surface of the annularly fixed portion to form a turning point such that the lining material is turned inside out which allows the turning point to advance within the pipe line thereby inserting the evaginated lining material into the pipe line, while pressing the surface of the lining material, onto which the binder has been applied, against the inner surface of the pipe line by the fluid pressure and solidifying the binder to effect bonding. This method has a number of merits. It is unnecessary to dig up a pipe line over its full length and the method is operable simply by digging the pipe line only at both terminal ends thereof to be treated, and the lining work itself can be done within a very short period of time even for a long pipe line. In recent years, therefore, this method has attracted special public attention.
In case a pipe line is lined according to this method wherein a tubular lining material is bonded to the entire inner surface of the pipe line, however, a passage with branch pipe lines off the main pipe line will have their entrances blocked. In the case of a gas conduit, for example, such problem will not arise in a high or middle pressure pipe line as a trunk conduit, because the line is usually devoid of any branched portion. In the case of a terminal low pressure pipe line, however, there are a number of branched supply pipe lines for supplying gas according to the unit of users, for example, the number of families.
Thus, the passages to the supply pipe lines will be blocked when the low pressure pipe line is lined according to the above mentioned method. In such a case, digging up the branched portions from the ground for boring the lining material after the lining treatment will make no substantial difference from digging up the entire pipe line over its full length, thus losing the greatest merit of this lining method.
Accordingly, there is a demand for developing a simple and easy means for boring the applied lining material at the branched portions after the pipe-lining treatment to communicate the branched pipe lines to the main pipe line without digging up the branched portion from the ground.
A method is known wherein a cart movable by remote control and a device for detecting a branched portion to a branched pipe line, such as a TV-camera, movable together with the cart, are disposed within a lined pipe line, and a boring head installed on the cart is moved freely in both circumferential and radial directions within the pipe line to the branched portion by remote operation to bore the lining material blocking a path to the branched pipe line (British Pat. No. 2,092,493).
In this device for boring, however, a means for exactly detecting the position of an opening to a branched pipe line on the inner surface of the lined pipe line is quite necessary and a driving means for moving the boring head is also necessary so that the device becomes inevitably complicated as a whole. Thus, such a device and method cannot be applied to a pipe line ha
REFERENCES:
patent: 1174444 (1916-03-01), Quain
patent: 2516950 (1950-08-01), Bragg
patent: 3275803 (1966-09-01), True
patent: 4359627 (1982-11-01), Takeichi
patent: 4641016 (1987-02-01), Garcia
patent: 4795885 (1989-01-01), Driggers
Morinaga Akio
Otsuga Hisao
Shimokawa Shinji
Toyoshima Osamu
Zenbayashi Katsuaki
Ashimori Kogyo Kabushiki Kaisha
Tokyo Gas Kabushiki Kaisha
Walberg Teresa J.
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