| 摘要 |
PURPOSE:To automatically and vertically move an atmospheric pressure capsule by utilizing the internal pressure of a caisson work chamber by providing a pushing down or up pressure chamber to a guide cylinder into which the capsule is housed. CONSTITUTION:When a caisson is settled to a given depth and concrete is placed into a work chamber 2, an air supply and discharge valve is switched to supply compressed air in the work chamber 2 to the pressure chamber 12 for pushing-up purpose and also the pressure chamber 11 for pushing-down purpose is led to the open air. By this, the capsule 9 is housed in the opening portion 4 of the ceiling 3 of the caisson by upwardly moving the capsule 9 and an elevating inner cylinder 8. When lowering the capsule 9, the air supply and sicharge valve is switched to supply compressed air in the work chamber 2 to the pressure chamber 11 and the pressure chamber 12 is led to the open air. Also, when turning the capsule 9, a turning driver 15 is actuated and the capsule 9 is turned through any angle through a pinion 16 and an annular follow gear 14. |
