2. and according to the regional geological exploration hole, hole number S-28, and 29 data showed that, the regional ground following 43m range within widely distribution with sand layer and 20m range within exists more of soft soil, PC pile construction easy caused unloading pressure hole collapsed hole, to up not to good of unloading pressure effect, this is we in seriously analysis factory within geological survey report Hou, for perfusion pile into hole equipment used 10 type machine swing drill, and not used spin dug machine of reasons, spin dug machine into hole speed fast, walking transfer flexible, so its construction Shi, Bit in hole on hole wall disturbance is big, and drill pipe upgrade had fast, easy caused hole within time, makes hole wall by by pressure suddenly increases, especially in sand layer and soft soil more of formation in the, very easy caused collapsed hole, makes into pile quality to get guarantee, second used 10 type machine into hole perfusion pile to for construction than used spin dug machine into hole, more environmental, which into hole process in the produced of soil is led to site Nim mud, and wet stuck of main reasons, so should select used 10 type machine into hole perfusion pile to for construction.3. used 10 type machine into hole perfusion pile construction Shi, as long as for reasonable of construction layout, and arrangements, site site and the road on can control of clean, clean, to 3# boiler for cases, according to site construction layout figure (see attached page: 3# boiler perfusion pile construction layout figure), clear pool provides drilling by needed water, mud pool accommodate drilling process in the produced of mud, dang mud over mud pool volume of half Shi, should through mud pump will mud conveying to waste pulp pool, waste pulp pool should set in factory outside, and should timely for cleanup, Ensure adequate space. Construction of PC pile, very high standards for road, flatbed carrying PC pile on pavement rolled over and over again will result in shortened life expectancy for road use, ground subsidence, if rainy days, the ground slippery, muddy, and uses 10-hole bored pile construction can better maintain volume and maintain the site and on the road. To sum up, in practical terms, with 10 more advantages to construction machines pile is more meaningful.
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