METHOD FOR CONTROLLING SHIELD JACK OF SHIELD EXCAVATOR

PURPOSE:To provide a smooth, accurate method for controlling the shield jacks of a shield excavator by rotating the shield jacks smoothly. CONSTITUTION:Shield jacks 9-1-9-18 with which the excavator main body 1 of a shield excavator is provided are grouped into eight blocks B1-B8 and a valve is disp...

Full description

Saved in:
Bibliographic Details
Main Authors SAMEJIMA MAKOTO, NISHITAKE SHIGERU, TANAKA JUNICHI
Format Patent
LanguageEnglish
Published 21.10.1994
Edition5
Subjects
EARTH DRILLING
FIXED CONSTRUCTIONS
GALLERIES
LARGE UNDERGROUND CHAMBERS
MINING
SHAFTS
TUNNELS
Online AccessGet full text

Cover

More Information
Summary:PURPOSE:To provide a smooth, accurate method for controlling the shield jacks of a shield excavator by rotating the shield jacks smoothly. CONSTITUTION:Shield jacks 9-1-9-18 with which the excavator main body 1 of a shield excavator is provided are grouped into eight blocks B1-B8 and a valve is disposed in each block to equalize hydraulic pressures fed to the shield jacks of the same block. A point Q1 of force is calculated from a controlled angle when the shield jacks are rotated. The thrust of the block B-2 where the point Q1 of force based on principle 1 is located is greatest and the thrust of the block B-6 in a point-symmetrical relation to the block B-2 is lowest. The thrusts are decreased stepwise from the blocks B-1 to B-4 to B-8 to B-5 to B-7. To increase the distance set at the point of force based on principle 1, the amounts of increase of thrust are decreased in the blocks B-1, B-3, B-5, B-7 based on principle 2. To further increase the distance set at the point of force based on principle 2, the amounts of decrease of thrust in the blocks B-4, B-8 are increased based on principle 3.
Bibliography:Application Number: JP19930082881