PHC管桩施工技术方 案(国外英文资料).docVIP

PHC管桩施工技术方 案(国外英文资料) Construction technology and key points of PHC pipe pile Source: good foundation Author: admin time: 2010-03-14 engineering applications Industrial and civil buildings, multi-storey to high-rise buildings, railways, highways, bridges, ports and docks. Selection of bearing stratum of PHC pipe pile Fully weathered or strongly weathered rock formations Hard cohesive soil Dense crushed stone (sand powder) soil layer Main points of static pile driver 1, the pile driver in the process of hanging piles, feeding piles, is strictly prohibited walking and adjustment; 2, feed pile, pile body should avoid direct contact with both sides of joint position holding mechanism in fixture; 3. When the first section is inserted into the ground 0.5-0.6m, the verticality of the pile shall be strictly adjusted and the deviation shall not be greater than 0.5% before continuing to press down; 4. The verticality of the pile should be observed frequently during the process of piling. When the deviation of the verticality of the pile is greater than 0.5%, the reasons should be found out and corrected. When the pipe pile enters the hard soil layer, it is strictly prohibited to use the moving frame to correct the deviation; 5, pile should pay attention to observe the integrity of the pile concrete, once found pile cracks or block, should immediately stop, find out the reasons, take measures to improve; 6, each pile should be continuous pressure in the end, the pile and pile should be continuous, the middle shall not stop for no reason, and as far as possible to avoid the pile tip near the design of the bearing layer or through the pile when the pile. Operation points of hammer type pile driver 1, reasonable selection hammer, hammer, low impact; 2, the size of the pile cap should be moderate, cushion soft and hard to moderate, the thickness should be guaranteed; 3, the pile to the vertical, avoid partial hit; 4, welding quality should be guaranteed; 5, in the thick clay, silt