Boring or penetrating the earth – With signaling – indicating – testing or measuring
Patent
1989-09-26
1990-08-28
Novosad, Stephen J.
Boring or penetrating the earth
With signaling, indicating, testing or measuring
166 552, 166 66, 166 665, 166255, E02D 2900, E03F 306, E21B 4709, F16L 5518
Patent
active
049517589
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method of drilling apertures for branch lines closed by internal lining in the renovation of an obsolete sewage, water supply, gas or other pipeline installed underground or within a structure.
BACKGROUND ART
Recently, a pipe lining technology called pipe renovation has been employed for reestablishing a pipeline by renovation of an obsolete sewage pipeline, for instance.
This pipe renovation is a technology which comprises lining an existing pipeline internally with a continuous strip of synthetic resin wound spirally and filling the gap between the new and old pipelines with a filling agent but when such pipe renovation technology is applied to an existing pipeline having side pipes (branch pipes), it is necessary to drill apertures for the branch lines after application of the filling agent.
Heretofore, where the existing line is made of a magnetic material such as iron, it has been proposed to detect its branch line openings with a magnetic sensor and drill apertures for the branch lines in the detected positions from within the new pipeline. (See, for example, Japanese Patent Publication KOKAI No. 127420/1981)
However, where the existing pipeline is made of a nonmagnetic magnetic material such as concrete, e.g. Hume concrete pipe, the above-mentioned method using a magnetic sensor cannot be employed.
It might be contemplated to insert a drilling machine into the branch line and drill an aperture from the branch line side but in the case of sewage line renovation, it is sometimes difficult to insert a drilling machine into the branch line depending upon the geometry of the pipeline system.
DISCLOSURE OF THE INVENTION
This invention relates to a method of drilling apertures for branch lines closed by the renovation lining of a main pipeline having such branched lines from the main pipeline side which comprises setting a water plug carrying a position marker consisting of an antenna coil and a resonator adapted to oscillate in response to a resonator driving signal and, after stoppage of said driving signal, release a resonance signal remaining in said resonator through said antenna coil in a position within a branch line opening where said position marker is in substantially concentric relation with the axis of the branch line prior to lining, causing an antenna assembly for detecting said resonance signal to travel within the main pipeline after lining to detect the position of said position marker and driving a drilling means using the detected position of said marker as a target to drill an aperture for said branch line from within the main pipeline.
The water plug according to the present invention has a position marker comprising an antenna coil and a resonator adapted to oscillate in response to a driving signal and, after stoppage of said resonator driving signal, release a resonance signal remaining in the resonator which is disposed in such a manner that the axis of said antenna coil is substantially concentric with the axis of the branch line.
According to the drilling method of this invention, the opening of a branch line blocked by renovation lining can be accurately detected and drilled from within the main pipeline. Moreover, by means of the water plug of this invention used in conjunction with an antenna assembly, the opening of the branch line can be accurately located from the main pipeline side.
BRIEF DESCRIPTION OF THE DRAWINGS
FIGS. 1 through 6 show a first example of the drilling method of this invention for drilling apertures for branch lines after renovation lining. Thus, FIG. 1 is a sectional elevation view of the existing pipeline showing the robot and other equipment used in the plug mounting step;
FIG. 2 is a sectional elevation view showing the water plug set in position;
FIG. 3 is a sectional elevation view showing the condition of the pipeline after lining;
FIG. 4 is a sectional elevation view of the pipeline showing the robot and other equipment used in the marker position detecting step and aperture drilling ste
REFERENCES:
patent: 3019841 (1962-02-01), Ternow
patent: 3114876 (1963-12-01), Schuster
patent: 4442891 (1984-04-01), Wood
patent: 4465140 (1984-08-01), Hoehn, Jr.
patent: 4572293 (1986-02-01), Wilson et al.
Hirayama Hirozo
Kitahashi Naoki
Miyazaki Harutoshi
Oi Hisaichi
Sonku Masahisa
Novosad Stephen J.
Sekisui Kagaku Kogo Kabushiki Kaisha
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