| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a shaft construction method allowing support strength of bottom slab to increase. <P>SOLUTION: In this shaft construction method, excavated material 5 is thrown into an excavated hole 4 to a position lower than the top face 3d of a planned bottom slab 3. Concrete is then placed in the excavated hole 4 to form a continuous wall 2 and the excavated material laid in the lower end 2a side of the continuous wall 2 is removed. Thereby, a recess 13 is formed under the continuous wall 2. A reinforcement basket 14 is afterward inserted into the recess 13 and underwater concrete is placed in the bottom of a space S surrounded by the continuous wall 2. Thus, the underwater concrete flows into the recess 13 to construct the bottom slab 3 having a flange part 3a on the bottom of a shaft 1. By this shaft construction method, the recess 13 is easily prepared for forming the flange under the continuous wall 2, and the flange part 3a reinforced with the reinforcement basket 14 is easily constructed on the bottom slab 3. <P>COPYRIGHT: (C)2012,JPO&INPIT |
