Apparatus and method for steering a pipe jacking head

Details Apparatus and method for steering a pipe jacking head Apparatus and method for steering a pipe jacking head

1991-05-13

1992-11-17

Novosad, Stephen J.

Boring or penetrating the earth

Boring without earth removal

175 45, 175 61, 175 73, E21B 704, E21B 47024

Patent

active

051635208

ABSTRACT:
An apparatus and method for steering pipe casing laid underground is disclosed which includes a steerable pipe jacking head attached to a forward pipe casing and pushed through the ground by a string of pipe casings from a pipe pushing or jacking machine at a station below or above the ground. A steering wedge which may be rotated to a desired steering position and then extended from the forward end of the pipe jacking head is disclosed which accurately steers the pipe jacking head in horizontal and vertical directions. An inclinometer is used to measure the vertical position of the pipe jacking head. A directional heading sensor which includes a toroidal fluxgate magnetometer with a free floating ring core is utilized to measure the horizontal position of the pipe jacking head. Horizontal and vertical position signals, and the rotational position of the steering wedge, are measured and transmitted as serial data to a computer where the signals are processed and displayed graphically on a display screen. From the vertical and horizontal deviations in position, and the rotational position of the steering wedge, an operator may manually control the rotational position of the steering wedge and the extension and retraction of the steering wedge from the pipe jacking head to steer to head and pipe casings along a prescribed path.

REFERENCES:
patent: 3581404 (1971-06-01), Sanfead
patent: 3589454 (1971-06-01), Coyne
patent: 4361192 (1982-11-01), Trowsdale
patent: 4674579 (1987-06-01), Geller et al.
patent: 4823888 (1989-04-01), Smet
patent: 4907658 (1990-03-01), Stangl et al.
patent: 4953638 (1990-09-01), Dunn
patent: 5002137 (1991-03-01), Dickinson et al.

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