On the cleaning of rotary drilling rig
You don't give a penny to anyone. Who wants to tell you?. The concrete steps of clearing holes can be used in the construction method of Baidu rotary drilling rig.
Or pump in the mud to clear the holeAfter the end of the hole pile hole drill, will increase 10 20m, using a large amount of pump pump performance meet the new requirements of the mud, and maintain the normal circulation of more than 30min, a clear hole end condition: Pan orifice mud hand twist basic block slag, measured the hole depth and the actual drilling depth error in 30 when in.Test of deposit thickness (friction pile 300mm), mud index (relative density: 1.03 ~ 1.10; viscosity: 17 ~ 20Pa.s; the sand rate < 2%) to meet the design requirements before the proposed drilling rig
Rotary drill a hole cleaning with a bucket of fish for repeated loose ballast, ballast thickness specification loose until now.The two hole cleaning after the installation of steel reinforcement cage and the catheter, adjust the proportion of mud, with small proportion of mud into the hole, and a large proportion of sediment mud replacement hole, the mud and sediment thickness meet the standard requirements, agreed to by the supervision engineer after pouring underwater concrete. In order to ensure the quality of concrete pouring, the thickness of ballast meets the specifications and design requirements, and the proportion of slurry is less than 1.05
Rotary drilling, which meet the design requirements when the rotary drill is a few laps and idling; after several hours of the cage and the catheter after the hole and some sediment, have to clean the hole, now called the two hole cleaning. However, with the development of science and technology, the popularization and application of new technologies and materials. With the new wall protecting liquid, not only the wall is well protected, but also the hole and the sediment behind the cage seldom meet the requirements, the two cleaning procedures can be omitted, and the pile forming speed is greatly improved. For example, we use the Montreal chemical mud in construction after the Zhengzhou Xinzheng Airport, nearly 70 meters of sediment pile placed for 2 days no more than 20 cm. It brings great convenience to the construction.
