| 摘要 |
PURPOSE:To shorten the period of construction by making the penetrating and drawing operations of a partition plate easier by providing a jack to press the side plate of a joint box to the wall of an excavated pit. CONSTITUTION:A reinforcing bar cage 14 having a joint box 12 on its side end is penetrated into an excavated preceding pit 10. A jack 20 is extended to press the side plate 12a of the box 12 on the wall face of the pit 10, and concrete is driven to the portion other than the box 12 to form a preceding wall 16. A following pit 22 is excavated, a partition plate 12c is drawn out, and another reinforcing bar cage 14 of the same structure is penetrated in such a way as to overlap the ends of the cages 14 in the box 12. Concrete is then driven to form a follow wall 24. |
