| 摘要 |
A caisson construction method is provided to shorten a period of construction for an underwater structure by reducing the cost and time required for settlement of a caisson, to improve bearing strength of a caisson by preventing the formation of a hollow caused by tidal subsidence, to prevent the partial disposition of a caisson and to prevent the permeation of water into a caisson by waterproofing with lubricates. A caisson construction method comprises the steps of: making a tubular foundation reach a soil layer(1) on the water and settling down by dead weight; draining off water in the settled foundation using a pump; removing soils using equipment such as a clamshell and waterproofing the lower part of the foundation using a watertight mat or other watertight devices; installing a form on the upper part of the buried foundation to place an upper case having the same shape as the foundation; installing empty pipes(20) around the installed form at regular intervals, welding both ends of the pipe, installing an injection tube(22) connected with the inside of the welded pipe on the upper part of the form and fixing the pipe; forming an upper case(40) by placing and curing concrete in the form; removing the form; subsiding the upper case using dead weight or driving, injecting lubricants(30) into the inside of the pipe through the injection tube to settle the upper case and the foundation easily when the pipe is settled into the soil layer, and jetting out through a through-hole(21) formed on the outside of the pipe; subsiding the upper case and the foundation and removing the inside soils; and installing another upper case on the upper part of the settled upper case and subsiding repeatedly. |
