Sleeve valve pipe grouting foundation reinforcement

Sleeve valve pipe grouting process technology 1. Drilling hole drilling method using casing wall drilling, drilling depth should reach the height of the grouting consolidation section. During the drilling process, records should be made for grouting operations. 2. According to the requirements of grouting, the lower pipe should be type B grouting pipe under the grouting part and type A grouting pipe under the non-grouting part. Firstly, add a stuffy cap at the bottom of the connected grouting pipe, and put the grouting pipe into the grouting hole. Make sure that the grouting pipe goes to the bottom of the hole, the upper part is above the ground, and then fill in the grouting pipe. Water, the use of gravity, so that the grouting pipe will not float, then slowly raise the casing, and then cover the top of the grouting pipe to prevent debris from entering the grouting pipe, affecting the grouting work quality. 3. After the plugged casing is pulled out, it shall be filled with sand or gravel below 1m above the ground, and shall be plugged with quick-setting cement mortar around 1m above the ground to the ground segment and around the orifice to prevent slurry from grouting. The phenomenon occurs. 4. The grouting adopts segmented grouting. The length of each grouting is called grouting step. The tube length is the length of the grouting step. The grouting step is generally selected from 0.6 to 1 m, which can effectively reduce the effect of formation heterogeneity on the grouting effect. For the sand layer, the grouting step should be chosen to have a low value; for sand pebbles or broken rock layers, the grouting step should be set at a high value. During the grouting process, the length of the heart tube is moved up or down one step after the grouting is completed. Should use the lifting equipment to move, or manually use two pipe clamps symmetrically clamped the heart tube, both sides at the same time and force, move the heart tube. For each grouting length of 3 to 4m, remove one grouting heart tube. After the grouting is completed, a squeezing cover is placed on the grouting pipe to facilitate re-injection construction.