Construction method and construction system for eliminating sand liquefaction

Abstract

Disclosed are a construction method and a construction system for eliminating sand liquefaction. The construction system includes a first drilling rod, a pneumatic down-the-hole (DTH) hammer installed on the first drilling rod, an air compressor drivingly connected with the pneumatic DTH hammer, a driving motor drivingly connected with the first drilling rod and a high-pressure pump connected with the first drilling rod; and the construction method includes following steps: measuring the ground to be constructed to determine the pile position to be constructed; controlling the air compressor to drive the pneumatic DTH hammer to drill holes in the pile position to be constructed, controlling the driving motor to drive the first drilling rod to rotate around an axis in an up-down direction, and controlling the high-pressure pump to spray the cement slurry toward a circumferential side of the first drilling rod.

What is claimed is: 
     
         1 . A construction method for eliminating sand liquefaction, applied to a construction system, wherein the construction system comprises a first drilling rod, a pneumatic down-the-hole (DTH) hammer installed at one end of the first drilling rod, an air compressor drivingly connected with the pneumatic DTH hammer, a driving motor drivingly connected with the first drilling rod, and a high-pressure pump connected with the first drilling rod to spray cement slurry toward a periphery of the first drilling rod;
 wherein the construction method for eliminating sand liquefaction comprises the following steps:   measuring a ground to be constructed to determine a pile position to be constructed;   controlling the air compressor to drive the pneumatic DTH hammer to drill holes in the pile position to be constructed, controlling the driving motor to drive the first drilling rod to rotate around an axis in an up-down direction, and controlling the high-pressure pump to spray the cement slurry toward a circumferential side of the first drilling rod;   acquiring a depth of a drilled hole drilled by the first drilling rod; and   raising the first drilling rod to a ground surface then the depth of the drilled hole reaches a designed depth.   
     
     
         2 . The construction method according to  claim 1 , after the step of acquiring the depth of the hole drilled by the first drilling rod, further comprising:
 controlling the air compressor to output safe air pressure to drive the pneumatic DTH hammer to drill through the safe air pressure before the depth of the drilled hole reaches a safe depth; and   controlling the high-pressure pump to output safe slurry pressure so as to spray the cement slurry through the safe slurry pressure;   wherein the safe depth is smaller than the designed depth.   
     
     
         3 . The construction method according to  claim 2 , after the step of acquiring the depth of the hole drilled by the first drilling rod, further comprising:
 controlling the air compressor to output a first air pressure to drive the pneumatic DTH hammer to drill through the first air pressure when the depth of the drilled hole reaches the safe depth; and   controlling the high-pressure pump to output a first slurry pressure to spray the cement slurry through the first slurry pressure;   wherein the first air pressure is greater than the safe air pressure, and the first slurry pressure is greater than the safe slurry pressure.   
     
     
         4 . The construction method according to  claim 3 , wherein the step of raising the first drilling rod to the ground surface when the depth of the drilled hole reaches the designed depth comprises:
 controlling the air compressor to output a second air pressure to drive the pneumatic DTH hammer to vibrate through the second air pressure; and   controlling the high-pressure pump to output a second slurry pressure to spray the cement slurry through the second slurry pressure;   wherein the second air pressure is greater than the first air pressure, and the second slurry pressure is greater than the first slurry pressure.   
     
     
         5 . The construction method according to  claim 1 , wherein the construction system further comprises a second drilling rod with a length greater than that of the first drilling rod;
 the first drilling rod rotates around the axis in the up-down direction while the air compressor drives the pneumatic DTH hammer to drill holes in the pile position to be constructed, and the circumferential side of the first drilling rod is sprayed with cement slurry by the high-pressure pump;   the second drilling rod is obtained by extending the first drilling rod when the first drilling rod is fully extended into the drilled hole, where the driving motor, the air compressor and the high pressure pump stop working when the first drilling rod is fully extended into the drilled hole; the driving motor, the air compressor and the high pressure pump start working to drive the second drilling rod to continue drilling after the second drilling rod is obtained.   
     
     
         6 . The construction method according to  claim 1 , wherein the construction system further comprises a first stiffening core and an elevator for placing the first stiffening core;
 after the step of raising the first drilling rod to the ground surface when the depth of the drilled hole reaches the designed depth, the method further comprises:   controlling the elevator to place the first stiffening core into the drilled hole.   
     
     
         7 . The construction method according to  claim 6 , wherein the first stiffening core is provided with at least three centering brackets towards a side wall of the drilled hole;
 the step of controlling the elevator to place the first stiffening core into the drilled hole comprises:   connecting the first stiffening core with the elevator;   extending the first stiffening core into the drilled hole, and enabling a plurality of centering brackets on the first stiffening core to abut against the inner wall of the drilled hole; and   controlling the elevator to extend the first stiffening core to the designed depth.   
     
     
         8 . The construction method according to  claim 6 , wherein the construction system further comprises a second stiffening core with a length greater than that of the first stiffening core;
 the step of controlling the elevator to place the first stiffening core into the drilled hole further comprises:   controlling the elevator to stop working when the first stiffening core completely extends into the drilled hole;   extending the first stiffening core to obtain the second stiffening core; and   controlling the elevator to start working so as to continuously place the second stiffening core.   
     
     
         9 . A construction system, comprising:
 a main driller, comprising a first drilling rod and a pneumatic DTH hammer installed at one end of the first drilling rod;   an air compressor connected with the pneumatic DTH hammer in a driving way and used for driving the pneumatic DTH hammer to vibrate and drill;   a high-pressure pump connected with the first drilling rod used for injecting cement slurry towards a circumferential side of the first drilling rod;   a driving motor installed on the main driller and connected with the first drilling rod in a driving way to drive the first drilling rod to rotate around an axis in an up-down direction; and   a controlling device electrically connected with the air compressor, the high-pressure pump and the driving motor respectively, wherein the controlling device comprises a memory, a processor and a controlling program stored in the memory and operable on the processor, and the controlling program is configured to realize the construction method for eliminating sand liquefaction according to  claim 1 .   
     
     
         10 . The construction system according to  claim 9 , wherein the construction system further comprises a first stiffening core and an elevator, and the elevator is used for placing the first stiffening core into the drilled hole.