PROPULSION UNIT FOR EMBEDDING PIPE BODY

摘要

PROBLEM TO BE SOLVED: To withstand the propulsion force of a liquid pressure jack and hold an optical axis so as to improve the propulsion measuring accuracy by attaching a laser projector for measuring propulsion position of an excavator to a band type support member to be tightened and fixed in a cylindrical vertical shaft. SOLUTION: A band type support member 3 is inserted in a cylindrical vertical shaft made of steel 1 and is tightened and fixed in the cylindrical vertical shaft 1 by an expansion and opening fixing device 2. A lower part of a front end of a steel guide rail 4 extended in the forward and backward directions is connected through a groove-shaped frame 56 to constitute a support frame 5. A rear part of the support frame 5 is attached to a reaction force support member 8 in a rear part in the band type support member 3. Right and left parts of a pipe body insertion member 7 moved forward are slidably fitted in the guide rail 4 by a liquid pressure jack arranged on the support frame 5. A laser projector for measuring propulsion position 10 is attached to a rear part in the band type support member 3. Since the band type support member 3 receives propulsion reaction force integrally with the vertical shaft 1, it is possible to withstand the deformation up to the reaction force larger than that of the propulsion jack and hold an optical axis.