| 摘要 |
<p>PURPOSE: To improve work efficiency by assembling a lining element manufactured by casting low impact strength wall part in a main wall having high compressive strength and high impact strength, and then knocking the wall part having low impact strength to be taken as an opening part. CONSTITUTION: A semicircular recessed part 13 is formed in one circumferential edge part 11a of a main wall 12 formed of steel reinforced concrete having high compressive strength and high impact strength. A removable wall part 14 formed of light-weight Lytag concrete is cast in the recessed part 13 to form a lining element 11. The lining elements 11 are disposed in required places and combined with the conventional lining element 10... to assemble a lining for a tunnel or a shaft. Subsequently, after the end of assembling, the removable wall part 14 is removed to be formed as an opening for a branch shaft or a tunnel.</p> |
