When the rotary drilling rig is working, there is always some sediment at the bottom of the hole, which is an unavoidable defect of the rotary drilling rig. So why does it have sediment at the bottom of the hole? The main reason is that its construction process is different. The rotary drilling rig adopts the non-circulating mud drilling method, and the drilling slag cannot be carried to the ground by the circulation of the mud to settle down.
The following are the main reasons for the occurrence of sediment:
1.Residue between the bucket teeth of rotary drilling rig and the bottom cover of drilling bucket
2.The teeth of small rotary drilling rigs are sparse, so the sediment between the teeth is inevitable;
3.The bottom cover of drilling tool is not tightly closed;
4.The soil cut out from the outer edge of the rotary drilling bucket cannot enter the cylinder mouth due to the flat bottom of the hole and remains at the edge of the bottom of the hole;
5.When drilling mud sand and flow-plastic formations, the drilling slag in the drill bucket is lost during the lifting process, and sometimes even all of it is lost into the borehole;
6.The return stroke of the drill bucket is too large, the load is too full, and the muck is squeezed out of the drainage hole of the top cover.
According to the national standard, the target thickness of the sediment at the bottom of the hole for the conflict pile and the end-bearing pile is not more than 100mm and not more than 50mm, respectively.
The above are the reasons for the occurrence of sediments in the hole formation of small rotary drilling rigs summarized by Gookma. Although this is an inevitable defect of small rotary drilling rigs, rotary drilling rigs are still the most suitable machinery for drilling and piling at this stage.
After the rotary drilling rig has drilled the hole, we must clean the hole, so that the sediment at the bottom of the hole can be removed.
Gookma Technology Industry Company Limited is a hi-tech enterprise and a leading manufacturer of rotary drilling rig, concrete mixer and concrete pump in China. You are welcome to contact Gookma for further inquiry!
Post time: Jun-17-2022
