| 摘要 |
PURPOSE:To markedly save term of work and construction cost, by a method wherein an upper block and an intermediate block are coupled together on a two-way block, earth at the inside is excavated and discharged, the blocks are pressed in and sunk, and a starting and arrival pit port is opened. CONSTITUTION:A pressing-in mechanism and laying plates 16 are placed on coupled lower blocks 21a on a two-way block 14, and they are pressed in as earth on the inside is excavated. A temporarily closed starting and arrival pit port 32 is formed in the side of the lower block 21a. The lower blocks 21a and upper blocks 21c are pressed in, in order, from the lower blocks to a given depth, a pressing-in mechanism, such as jacks, is removed, a land within the two- way block 14 is graded, and the temporarily closed starting and arrival pit port 32 is cut and opened. This enables a multilayered caisson to be sunk in a condition to keep solidity and watertightness, and permits decreasing of term of works and construction cost. |
