旋喷桩施工工艺(国外英文资料).docVIP

旋喷桩施工工艺(国外英文资料) Ask: how high pressure jet grouting pile construction? Process and others? Http:///forum/detail547732_1.html youre here. Theres a lot of information about that High pressure jet grouting technology Material selection and preparation Jet grouting is impact by high-pressure liquid flow and destruction of soil and soil mixed into a new solid jet, according to process requirements, should have the following characteristics: slurry grouting fluid has good sprayability; sufficient stability; slurry gas should be less; the gelation time of the slurry can mediate excellent mechanical properties; good; non-toxic, odorless, high seed setting rate. Water cement ratio generally adopts 1:1~1.5:1 cement grout. Prepare adequate cement grout according to the construction requirements before spraying, Two. Determination of swirl injection parameters 1. Determination of pressure parameters Under normal circumstances, increase the pump pressure to increase its flow and flow rate, thereby increasing the injection force. Based on past experience, the project selection pressure: 0~3 meters, by 25Mpa, 3 meters below the 23 Mpa. 2. Determination of rotational lifting parameters The speed of rotation and lifting is related to the radius of jet, and the effective radius is related to the geometry and injection angle of nozzle, and directly affects the characteristics of jet. According to the construction experience, the injection speed should be controlled within the range of 25~28cm/min, and the rotation speed should be controlled within the range of 20~28r/min. Among them, the top 1m should choose a slower speed and lifting speed. Generally 20~23cm/min, speed up, 20r/min rotation. 3 nozzle diameter The nozzle installed on the side of the drill is the key part of the jet grouting. The size of the powder injection has a great influence on the jet flow velocity. In general single pipe grouting, the nozzle diameter is chosen 2.0~3.2mm. Three, determine the parameters of jet gro