【正文】 Since each article slot end Department 20cm Department each across 2~3M, Small chunks of wood slot helped nail the horizontal elevation. In digs close to trough at the bottom level, with a ruler or well in advance of the 50cm gauge rods at any time to check on the small chunks of wood slot bottom level. Finally ends the axis( centerline ) Latrun line, checks from the slot size to determine width of Groove standard, thus trimming ledge and finally clearing the tank bottom land, wiped out at the end of it. （ 6) Foundation (tank), upright and incline of the tunnel, excavation and should prevent the landslides during the open, if necessary, should be protected. When excavation groove edge spoil, shall ensure the stability of the slope and vertical. When the soil is good, thrown in the lateral soil (or material), should be from the slot (Groove) edge 0. 8m other than the height should not be more than 1. 5m。 On the side of column base, around wall and base wall are not dozing off the wall. (7) Excavation pit (slot) soil, in field conditions when stacked, sufficient backfill need good soil, excess soil out to avoid second handling. （ 8) Earth excavation generally should not take in the rainy season, should not be too large the working surface, should be pleted in stages by subparagraph. Excavation of Foundation pit and the trench in the rain period (slots), should pay attention to slope stability and, if necessary, may be appropriate to slow down slope or set the prop. While in the pits (Groove) outside the enclosed by Earthen berms or digging ditches, prevent surface water entering. During construction, should be strengthened for the slope, support and other checks.（ 9) Earth excavation should not be taken in the winter. If it is necessary to take construction in winter, its working methods should be carried out by winter programme. When using prevent freezing excavation method, be covered with insulating material before the freeze or topsoil plowing rake pine, tillage depth should according to local climate conditions, normally not less than 。 (B) Depth exceeds the above provisions, between 5m, whe