PERFECT CIRCLE HOLDING DEVICE
PROBLEM TO BE SOLVED: To provide a perfect circle holding device which has simple and compact constitution and includes movement driving means capable of achieving driving by a compact actuator.SOLUTION: A perfect circle holding device 10 which holds a shape of a segment covering an inner surface of...
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Zusammenfassung: | PROBLEM TO BE SOLVED: To provide a perfect circle holding device which has simple and compact constitution and includes movement driving means capable of achieving driving by a compact actuator.SOLUTION: A perfect circle holding device 10 which holds a shape of a segment covering an inner surface of a tunnel by pressing the inner surface includes: a pair of right and left moving carriages 20 capable of moving on a support member 3 extending in parallel with an axis of a shield excavating machine 1; a pair of right and left extending/contracting columns 30 which are stood on the pair of moving carriages 20 and can extend and contract vertically; an upper arch 40 which is constructed over between upper end parts of the pair of extending/contracting columns; and a pair of right and left movement driving mechanisms 70 which drives and moves the pair of moving carriages on a support member in parallel with the axis of a cylinder excavating machine. Each movement driving mechanism includes: a link mechanism 72 which can bent in a perpendicular plane between a bending state and an extending state, and has one end part connected to the moving carriage and the other end connected to the support member; and an actuator which can drive the link mechanism between the bending state and extending state. |
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