Well point pipe sinking and assembly with a shrinkage nozzle for the 50 stainless steel welded pipe, punch pipe and the pressure hose connected to the hose, high pressure punching sink in place, the depth of the hole to reach the design elevation quickly set aside Rinse the tube, install the well tube in the hole, and confirm the elevation is correct, the hole is filled with sand. Filter sand lower than the aperture 1m ~ 1.5m, filled with clay around the hole does not leak. This cycle will be set after the well point pipe is completed, the well point pipe and the Explorer connected to the hose, the joints wipe 1 pass butter, prevent leaks. Observation of well point precipitation When the well point started to run, the piezometric hole water level in the precipitation area was observed daily. The water level dropped to 12.0m after 7 days of well point operation. Meet the excavation requirements. Cement mixing infiltration pile Cement mixing cutoff pile cutoff using P032.5 grade cement, incorporation of 15%, pile and pile sleeve 100mm can form a 300mm wide cutoff wall. The pressure tank on the east side of the foundation pit 7.5m at the construction of 1: 1 excavation slope can be guaranteed. According to the stability analysis of slope of clay soil, the gravity of soil is 19.2kN / m3; the cohesion of soil is C = 7.0kN / m3; the angle of internal friction = 24 °; the slope of the cut slope is 45 °. According to the internal friction angle and slope gradient, the reciprocal of the stability coefficient is N = 0.05. Therefore, the maximum excavation height of the soil is 1: 1 when the slope is H = crN = 719.2 × 0.05 = 7.29m and the excavation depth is 6.5m. It is the phenomenon of water flow and infiltration between bored piles after foundation pit excavation. There is partial water seepage along the edge of the bottom of the pit, and finally the ditch is dug along the edge of the foundation pit to use the bright row. The construction of cutoff wall not only ensures the excavation of the foundation pit and the settlement of the surrounding buildings but also ensures the stability of the soil between the piles of the retaining wall in construction. Light well point precipitation and mixing pile construction problems (1) in the construction of the hole should be punching along the location of the first digging groove, so that the water generated by punching the orderly discharge. (2) Hose and well point pipe and the main pipe joints should be dense and sealed with butter, which can greatly enhance the effect of precipitation. (3) After the well point pipe sinking around the sand should be left about 1.5m distance, and filled with clay. This will prevent air leaks. (4) mixing pile should be strictly controlled sinking speed, mixing should be uniform, the construction should be continuous, the interval should not exceed 2h.
Roof Panel,Steel Sheet,Color Coated Steel Coil,Galvanized Steel Coil
Prepainted Coil Co., Ltd. , http://www.sdhfgroup.com