Measuring and testing – Vibration – By mechanical waves
Patent
1994-05-19
1995-10-17
Williams, Hezron E.
Measuring and testing
Vibration
By mechanical waves
73784, 73 405A, G01H 1700, G01S 0380
Patent
active
054579953
ABSTRACT:
A method and apparatus for detecting pipe penetration by the bore head of horizontal boring machine utilizes acoustic and seismic sensors. A sensitive acoustic microphone is placed in the bottom of the nearest sewer manhole to the location of the bore head to detect acoustic signals transmitted through the ground by the bore head for producing a first output signal. A seismic pickup device is placed in the vicinity of the bore head to detect vibrations of the ground caused by the bore head, as it moves through the ground, to produce a second output signal. These first and second signals produced, respectively, by the microphone and the seismic pick-up device, then are supplied to a two-channel strip chart recorder, which provides an output indicia permitting simultaneous comparison of the two signals. Particular patterns of these detected signals are indicative of the penetration of a sewer pipe. In addition to these two signals, analysis of the pressure on the bore head by the boring machine also may be made and compared with the output signals produced by the microphone and seismic pick-up device, as a further input to determine whether penetration of a sewer pipe has been effected.
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Peck William O.
Staton Raymon R.
Kwok Helen C.
Northern Pipeline Const.
Ptak LaValle D.
Western Resources
Williams Hezron E.
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