土方回填施工方案（Earthwork backfill construction scheme）.doc

土方回填施工方案（Earthwork backfill construction scheme） Earthwork backfill construction scheme I. basis for compilation Construction drawing Code for acceptance of work quality of foundations and foundations Unified standard for quality acceptance of Construction Engineering Technical specification for safety operation of construction machinery Two 、 construction process According to the site, two times the first time to backfill, backfill foundation beam top elevation, second earthwork backfill to the design elevation, packing back to more than 0.97 star, construction of stratified soil, mainly due to excavation pile in the field the two phase of the project site, can take the original soil backfill. Vibration compactor and ramming ramming machine with solid foundation pit wall surface, the local edge with artificial ramming. As the construction needs, the upper structure is a high number of formwork, the first backfill to the top of the foundation beam, after the completion of the structure, and then backfill to the design elevation. The construction time of the foundation beam is relatively short, while the backfill is protected, and the excavator and dump truck can not directly crush the ground beam. 1, process flow: 2, fill the former should be the foundation pit (groove), pipe ditch and other debris to clean up; must clean up to the foundation trench backfill, bottom elevation, loose soil, mortar, stone fall clean up. 3 water, test of backfill rate is within the control range, such as high water content, can be used to loose, dry or mixed into dry soil and other measures; in case of backfill soil moisture content is low, the water wetting and other measures in advance. 4, backfill should be stratified spreading and compaction. The soil thickness of each layer shall be determined according to the soil quality, compactness requirements and the performance of the machines and tools. General ramming machine thickness of soil layers is 200 ~ 250mm; artificial ramming does