【Construction case】SJL-120 rotary jet

Stratum situation

Location: Shandong Province

Location: Jinan

Drill model: SJL-120 rotary jet drill

Drill configuration:

142 porous drill bit, 142 porous drill rod, 142 shunt

Process type: rotary spray water stop

Construction technology: the MJS construction method

Formation situation:

1-6 meters of loess;

7-10 Silty clay;

11-14 clay;

14-16.5 Powder sand;

17-24 clay

Construction Angle (°): 90

Pile diameter (m): 1.8

Pile depth (m): 18.5

Construction technology

Construction configuration

One Anman MXL-150D anchor rig with 89 and 250 three-wing drills for lead construction and two Anman SJL-120 spin drills with 142,142, and 142 shunt for spin construction

MXL-150D was used for the prime wells

Two SJL-120 were constructed simultaneously

Background configuration

• A 250 plunger pump is used for water intake from the diversion hole;
• A 230 high-pressure pump is used for rotary jet grouting;
• A 165 high pressure pump is used in rotary water spray cutting;
• A 90E high pressure pump is used for rotary injection back slurry;
• A 12 cubic air compressor to ensure that the pressure remains above 1.0MPa;
• A mud pump;
• A set of fully automatic mixing station;
• A group of cement tanks;
• A high-pressure cleaning machine is used for cleaning both the drill pipe and the drill bit;
• Connect through 25 diameter 6 layer high pressure pipe 19 diameter 4 layer high pressure pipe