md3住宅工程土方开挖方案(中英版本)(编辑修改稿)

md3住宅工程土方开挖方案(中英版本)(编辑修改稿)内容摘要：

width of 8m platform. Small excavator can excavate to , at the same time transfer the soil to big excavator, load in the car by big excavator and transported to spoil location. The position excavator cannot touch, cooperated with MD3 PROJECT 9 / 17 manpower to excavate and make flat. Third step piling the steel sheet pile around the lift pit, do the support system and use longarm excavator to excavate from to . The bottom foundation should 20cm soil layer for worker to clean and make flat to avoid the over excavation and disturbance of base foundation. Forth step, after finishing the lift pit foundation structure, remove the around steel sheet pile. Excavate left part of bottom slab to . Excavation step finished. For excavation plan and section, please refer to the excavation method drawings. After finishing excavation step 1 and 2, set the observation point at the top, middle, bottom of slope and inside the foundation. Surveyors should survey 2 times 1 day to check the stability of foundation slope. After finishing excavation, surveyor must set the base line and inspect the foundation ditch. After foundation ditch inspection qualified, workers excavate 20cm reserved soil. Use the ruler measure the 50cm standard rod, check the base foundation elevation at any time. Set the foundation side line on the base foundation. After leveling the foundation ditch, carry out the construction cushion etc. next step immediately. Set the road passing into the foundation on the soft soil. Maintain the surface and base of foundation drainage system. Prevent the basement water and rain water soak the base foundation. Reserve 50cm wide temporary drainage ditch along the side foundation outside 30cm. Set the sump pit at the corner, set one water pump at 1 foundation pit and pump the water of inside foundation. Prevent the surface water go inside the foundation pit, should use the 4hole bricks set the 100mm wide,300mm high dams outside the foundation the color cloth cover the slope to prevent rainfall. Excavation in layers, divide surface sand and mud to load in to cars. The backfill sand transported to MD4 , the mud transported outside. The backfill sand and mud mixed in the cars in not allowed. 2. Backfilling of earthwork Clean the rubbish and mud before backfilling and set cutoff drain around to prevent surface water pass inside the backfill area of foundation to soak foundation, which will MD3 PROJECT 10 / 17 cause foundation settlement. Should first use the backfill sand, clean the anic impurities and grain size larger than 50mm sand, the water content should meet the requirement. Backfill sand should be spread in layers and pacted, every spreading soil thickness and paction times should according to the soil quality, pacting factor and equipment capability. Backfill from the base, from base to top the hole wide horizontal spread and pact soil evenly. When deep and shallow foundation links, first backfill the deep pit until the same level as shallow pit and then fill. Compact prehensively. For example, filling segment forming step shape, the slope of it is 1:2. Layer junction should be staggered。 the upper and lower layer junction should not less than . Use fine soil to backfill both side the base wall and pipe. Make flat the backfill sand before the backfilling and pacting, ramming according to a certain direction, 1 paction and half paction, one by one, row by row, cross twice and pact in layer. When pacting the foundation pit and ground, the paction way should start from the around side to the center. When using small equipment such as frog ramming machine to pact, level the backfilling before pacting, tamping machine should ramming in turn, evenly separate and leaving no gaps. After backfilling and pacting the soil, should do the cutting ring sampling according to the specification to measure the mass density of dry soil. When meeting the requirement, then spread the upper layer soil. 3. Piles treatment We should check all the top elevation of piles according to the pile pletion data. And strictly control the excavation depth of excavator, avoid damaging the pile head. Check and record the pile position, pile inclination, and crack The soil 50cm around the pile must be excavated by workers. Cannot use the excavator, avoid damaging the pile head. For the cutting pile height, every time should not more than 2m. We must cut all the piles and transfer to the specified site. Excavators are forbidden to pulled down the pile MD3 PROJECT 11 / 17 head which hasn’t been cut to prevent the pile head damage. Pile treatment principles: 1) For the incli。