A MICP-based pressure-bearing borehole sealing device and method

Abstract

The present application provides a pressure-bearing borehole sealing device and method based on MICP, belonging to the technical field of soil reinforcement. The pressure-bearing borehole sealing device based on MICP includes a basic drilling assembly and an edge-expanding and strengthening assembly. A flexible cup-shaped plug is installed at the bottom of the borehole for partial water stop, and sand with a certain gradation is backfilled into the borehole. After the sealing device is installed, grouting and reflux seepage operations are carried out in the borehole until there is no water seeping out of the borehole, and the sealing is completed. An excavation device and an MICP grouting device are installed on the rotating table to carry out circular excavation around the pressure-bearing borehole, and a bacterial suspension and urea and CaCl2 solutions are poured into the circular groove. Thereby, the soil particles are cemented together to improve the bearing capacity, stiffness, and erosion resistance of the foundation. At the same time, grouting in the circular groove can effectively reduce the loss of calcium carbonate particles inside the soil and the change of the acid-base environment of the microbial living environment caused by external water and soil infiltration exchange, and maintain the strength stability of MICP microbial soil calcification.

Description

Technical Field

[0001] This application relates to the technical field of soil reinforcement, and more particularly, to a pressure-bearing borehole sealing device and method based on MICP. Background Art

[0002] Microbial Induced Calcite Precipitation (MICP) grouting technology is a new type of microbial geotechnical treatment technology. By injecting a bacterial suspension and a cementing solution (urea and CaCl2 solution) into the soil, it induces microorganisms to produce urease to decompose urea to generate carbonate ions and ammonium ions, and in the presence of calcium ions in the soil, calcium carbonate is generated, thereby cementing soil particles together to improve the bearing capacity, stiffness, and erosion resistance of the foundation. MICP grouting technology has advantages such as good slurry fluidity, strong permeability, adjustable reaction rate and cementing strength, small environmental pollution, and small disturbance to the soil, and is widely used in soft foundation treatment, sewage treatment, ancient cultural relics restoration, wind prevention and sand control, dam seepage prevention and other fields.

[0003] However, the participation of microorganisms in soil grouting and solidification may cause safety problems. The acid-base change of the soil will cause the decomposition of calcium carbonate and the limited reproduction of microorganisms, and the infiltration and scouring of rainwater in the soil will cause the loss of calcium carbonate and microorganisms, all of which will affect the safety and stability of pressure-bearing borehole sealing. Summary of the Invention

[0004] This application aims to solve at least one of the technical problems existing in the prior art. For this purpose, this application provides a pressure-bearing borehole sealing device and method based on MICP, which performs pressure-bearing borehole drilling and grouting sealing on the soil through a drilling device, and performs excavation and MICP grouting soil calcification operation on the periphery of the pressure-bearing borehole by motor rotation.

[0005] This application is implemented as follows:

[0006] This application provides a pressure-bearing borehole sealing device based on MICP, which includes a basic drilling component and an edge expansion and strengthening component.

[0007] The basic drilling assembly includes a base platform, a lifting platform, a lifting guide rod, a lifting screw, a drilling platform, a lifting motor, a grouting drill rod and a drilling motor. The lifting platform is symmetrically arranged above the base platform, the lifting guide rod is evenly arranged between the base platform and the lifting platform, the lifting screw is symmetrically rotatably connected between the base platform and the lifting platform, both ends of the drilling platform are transmitted to the surface of the lifting screw, the drilling platform is slidably sleeved on the surface of the lifting guide rod, the lifting motor body is arranged on the lifting platform, the lifting motor output end is transmitted to the upper end of the lifting screw, the upper end of the grouting drill rod rotates in the drilling platform, the drilling motor body is arranged on the drilling platform, and the drilling motor output end is transmitted to the injection At the upper end of the slurry drill rod, the edge expansion strengthening assembly includes an edge expansion platform, a rotating platform, a rotating gear shaft, a rotating motor, an edge expansion rail frame, an edge expansion slide and an edge expansion hydraulic cylinder. The edge expansion platform is suspended below the base platform, the rotating platform is rotatably connected to the bottom of the edge expansion platform, the rotating gear shaft is symmetrically rotatably connected to the bottom of the base platform, the lower end of the rotating gear shaft is engaged with the surface of the rotating platform, the rotating motor body is suspended below the base platform, the output end of the rotating motor is transmitted to the upper end of the rotating gear shaft, the edge expansion rail frame is evenly arranged around the rotating platform, the edge expansion slide slides on the surface of the edge expansion rail frame, the cylinder body of the edge expansion hydraulic cylinder is arranged on the edge expansion slide, and one end of the piston rod of the edge expansion hydraulic cylinder is fixed to the edge expansion rail frame;

[0008] In one embodiment of the present application, balancing seats are evenly arranged on the top of the base platform, suspension columns are evenly arranged on the bottom of the base platform, and the edge expansion platform is fixed to the lower end of the suspension column.

[0009] In one embodiment of the present application, a first swivel seat is symmetrically arranged on the base platform, a second swivel seat is arranged at the bottom of the lifting platform, and both ends of the lifting screw are rotatably connected between the first swivel seat and the second swivel seat.

[0010] In one embodiment of the present application, sliding guide sleeves are evenly arranged on the drilling platform, and the sliding guide sleeves are slidably connected to the surface of the jacking guide rod.

[0011] In one embodiment of the present application, a first pulley is provided at the output end of the drilling motor, a second pulley is provided at the upper end of the grouting drill rod, and the first pulley transmits power to the second pulley.

[0012] In one embodiment of the present application, screw nuts are provided at both ends of the drilling platform, and the screw nuts are driven on the surface of the lifting screw.

[0013] In one embodiment of the present application, a rotating ring gear is disposed in the rotating platform, a rotating gear is disposed at the lower end of the rotating gear shaft, and the rotating gear is meshed with the rotating ring gear.

[0014] In one embodiment of the present application, a suspension seat is rotatably arranged on the circumference of the rotating gear shaft, the suspension seat is suspended at the bottom of the base platform, and the rotating motor body is fixed on the suspension seat.

[0015] In one embodiment of the present application, a third pulley is fixed to the output end of the rotating motor, a fourth pulley is fixed to the upper end of the rotating gear shaft, and the third pulley transmits power to the fourth pulley.

[0016] In one embodiment of the present application, a corner platform is provided on the peripheral side of the rotating platform, and the edge expansion rail frame is provided on the corner platform.

[0017] In one embodiment of the present application, the pressure-bearing drilling sealing device based on MICP further includes:

[0018] A cofferdam strengthening component, the cofferdam strengthening component comprises a cofferdam hydraulic cylinder, a scraping tool, a positioning guide rod, an edge expansion tool, a strengthening hydraulic cylinder, a bonding liquid nozzle and a bacterial liquid nozzle, the cofferdam hydraulic cylinder body is evenly arranged on one group of the edge expansion slides, the scraping tool is symmetrically arranged on one end of the cofferdam hydraulic cylinder piston rod, the lower end of the positioning guide rod is evenly arranged on one end of the cofferdam hydraulic cylinder piston rod, the upper end of the positioning guide rod slides and slides through the edge expansion slide, the edge expansion tool is arranged on one end of the cofferdam hydraulic cylinder piston rod between the scraping tools, the strengthening hydraulic cylinder body is evenly arranged on one group of the edge expansion slides, the bonding liquid nozzle is arranged on one end of the strengthening hydraulic cylinder piston rod, and the bacterial liquid nozzle is arranged on one end of the strengthening hydraulic cylinder piston rod;

[0019] A detection enhancement component, the detection enhancement component includes a top pressure hydraulic cylinder, a top pressure detection body, an annular wall hydraulic cylinder, a rotary motor and an annular wall detection body, the top pressure hydraulic cylinder body is symmetrically arranged on the edge expansion platform, the top pressure detection body is arranged at one end of the top pressure hydraulic cylinder piston rod, the annular wall hydraulic cylinder body is evenly arranged on one group of the edge expansion slides, the rotary motor body is arranged at one end of the annular wall hydraulic cylinder piston rod, and the annular wall detection body is arranged at the output end of the rotary motor.

[0020] In one embodiment of the present application, a tool holder is arranged between the scraping tools, the tool holder is fixed to one end of the piston rod of the cofferdam hydraulic cylinder, the edge expanding tool is fixed to the bottom of the tool holder, and the lower end of the positioning guide rod is evenly arranged on the tool holder.

[0021] In one embodiment of the present application, a connecting seat is provided at one end of the piston rod of the reinforced hydraulic cylinder, the adhesive liquid nozzle is provided at one end of the connecting seat, the upper end of the adhesive liquid nozzle is connected to a adhesive liquid cylinder, and the bacterial liquid nozzle is provided at the other end of the connecting seat, and the upper end of the bacterial liquid nozzle is connected to a bacterial liquid cylinder.

[0022] In an embodiment of the present application, a support frame is provided on the cylinder body of the top pressing hydraulic cylinder, the support frame is fixed on the flanging table, a bracket is provided at one end of the piston rod of the annular wall hydraulic cylinder, and the body of the rotary motor is fixed on the bracket.

[0023] A pressure-bearing drilling hole sealing device and method based on MICP include the following method:

[0024] Adjust the angle of the drilling platform, control the rotation and lifting feed of the drill pipe through the motor until it stops after drilling into the pressure-bearing groundwater layer. Install a flexible cup-shaped plug at the bottom of the drilling hole for partial water stop, backfill the drilling hole with sand of a certain gradation, install the hole sealing device, and perform grouting and reflux seepage operations in the drilling hole until there is no water seeping out of the drilling hole, and the hole sealing is completed;

[0025] Control the excavation radius and lifting feed of the cutter through hydraulic pressure, control the rotation of the excavation cutter around the drill pipe through the motor, and perform layer-by-layer circular excavation of the soil. By pouring bacterial suspension, urea and CaCl2 solution into the excavated circular groove, induce microorganisms to produce urease to decompose urea to generate carbonate ions and ammonium ions, and generate calcium carbonate in the presence of calcium ions in the soil, thereby cementing soil particles and improving the bearing capacity, stiffness and erosion resistance of the foundation;

[0026] Perform calcification detection on the deep soil layer of the inner wall of the excavated circular groove through the detection device, and perform calcification detection on the rotating rod area through the detection device. Real-time perform all-round detection of soil calcification in the pressure-bearing drilling area, reduce detection dead angles, and perform rework in a timely manner to improve the project quality. After the detection is qualified, grout into the circular groove to form a pressure-bearing ring layer for protection, and cooperate with the microbial soil calcification of MICP to jointly support the strength of the pressure-bearing drilling hole, reduce the loss of calcium carbonate particles inside the soil caused by external water and soil infiltration exchange and the acid-base change of the microbial living environment, and maintain the strength stability of the MICP microbial soil calcification.

[0027] The beneficial effects of this application are as follows: A pressure-bearing borehole sealing device and method based on MICP obtained through the above design. During use, the device is moved to the pressure-bearing borehole sealing area, and the external balance device of the foundation platform adjusts the drilling angle of the grouting drill pipe. The rotation of the grouting drill pipe is controlled by the drilling motor, and the drilling feed of the grouting drill pipe is controlled in cooperation with the jacking motor to achieve pressure-bearing drilling of the soil. The drill bit of the grouting drill pipe stops after drilling into the pressure-bearing groundwater layer. A flexible cup-shaped plug is installed at the bottom of the borehole for partial water stoppage, sand with a certain grading is backfilled into the borehole, the sealing device is installed, and grouting and return seepage operations are carried out in the borehole until there is no water seepage in the borehole, and the sealing is completed. An excavation device and an MICP grouting device are installed on the rotating platform, and the rotation of the rotating platform is controlled by the rotating motor to carry out circular excavation around the pressure-bearing borehole, and a bacterial suspension and urea and CaCl solution are poured into the circular groove, so that they leak into the soil layer around the entire pressure-bearing borehole. Thereby, the soil particles are cemented together to improve the bearing capacity, stiffness, and erosion resistance of the foundation. At the same time, grouting in the circular groove can effectively reduce the loss of calcium carbonate particles inside the soil and the acid-base change of the microbial living environment caused by external water and soil permeation exchange, and maintain the strength stability of MICP microbial soil calcification. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of this application, the drawings required for the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0029] Figure 1 FIG. is a three-dimensional structural schematic diagram of a pressure-bearing borehole sealing device based on MICP provided by an embodiment of this application;

[0030] Figure 2 FIG. is a three-dimensional structural schematic diagram of a basic drilling component provided by an embodiment of this application;

[0031] Figure 3 FIG. is a first perspective three-dimensional structural schematic diagram of an edge-expanding and strengthening component provided by an embodiment of this application;

[0032] Figure 4 FIG. is a second perspective three-dimensional structural schematic diagram of an edge-expanding and strengthening component provided by an embodiment of this application;

[0033] Figure 5 FIG. is a three-dimensional structural schematic diagram of a cofferdam strengthening component provided by an embodiment of this application;

[0034] Figure 6 FIG. is a three-dimensional structural schematic diagram of a detection and strengthening component provided by an embodiment of this application.

[0035] In the figure: 100 - basic drilling assembly; 110 - base platform; 111 - balance seat; 112 - suspension column; 113 - first swivel base; 120 - lifting platform; 121 - second swivel base; 130 - lifting guide rod; 140 - lifting lead screw; 150 - drilling platform; 151 - sliding guide sleeve; 152 - lead screw nut; 160 - lifting motor; 170 - grouting drill pipe; 171 - second pulley; 180 - drilling motor; 181 - first pulley; 300 - edge - expanding and strengthening assembly; 310 - edge - expanding platform; 320 - rotating platform; 321 - rotating gear ring; 322 - corner platform; 330 - rotating gear shaft; 331 - rotating gear; 332 - suspension seat; 333 - fourth pulley; 340 - rotating motor; 341 - third pulley; 350 - edge - expanding rail frame; 360 - edge - expanding sliding frame; 370 - edge - expanding hydraulic cylinder; 500 - cofferdam - strengthening assembly; 510 - cofferdam hydraulic cylinder; 520 - scraping tool; 521 - tool holder; 530 - positioning guide rod; 540 - edge - expanding tool; 550 - strengthening hydraulic cylinder; 551 - connecting seat; 560 - cementing liquid nozzle; 561 - cementing liquid cylinder; 570 - bacterial liquid nozzle; 571 - bacterial liquid cylinder; 700 - detection and strengthening assembly; 710 - top - pressing hydraulic cylinder; 711 - support frame; 720 - top - pressing detection main body; 730 - ring - wall hydraulic cylinder; 731 - support; 740 - slewing motor; 750 - ring - wall detection main body. Detailed implementation manners

[0036] Next, the technical solutions in the embodiments of the present application will be described with reference to the accompanying drawings in the embodiments of the present application.

[0037] To make the purpose, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0038] Embodiment

[0039] As Figures 1-6As shown in the figure, the MICP-based pressure-bearing borehole sealing device according to the embodiments of the present application includes a basic drilling assembly 100, an edge-expanding strengthening assembly 300, a cofferdam strengthening assembly 500, and a detection strengthening assembly 700. The edge-expanding strengthening assembly 300 is installed at the bottom of the basic drilling assembly 100, the cofferdam strengthening assembly 500 is installed on the periphery of the edge-expanding strengthening assembly 300, and the detection strengthening assembly 700 is installed on the periphery of the edge-expanding strengthening assembly 300. The basic drilling assembly 100 drills the rock and soil through a hollow drill pipe, and performs backfilling of sandy soil and grouting reflux hole sealing operations; the cofferdam strengthening assembly 500 cooperates with the edge-expanding strengthening assembly 300 to excavate the cofferdam around the pressure-bearing borehole, and injects bacterial suspension and cementing liquid on the inner wall of the cofferdam, and performs backfilling of sandy soil and grouting reflux sealing ring operations. The detection strengthening assembly 700 cooperates with the edge-expanding strengthening assembly 300 to detect the consolidation of the rock and soil on the inner wall of the cofferdam, and detects the consolidation of the rock and soil at the top of the rock and soil around the pressure-bearing borehole.

[0040] As Figures 2-5 shown, the microbial-induced carbonate precipitation grouting technology is a new type of microbial geotechnical treatment technology. However, the participation of microorganisms in soil grouting and solidification may cause safety problems. The acid-base change of the soil will cause the decomposition of calcium carbonate and the limited reproduction of microorganisms, and the rainwater infiltration and scouring in the soil will cause the loss of calcium carbonate and microorganisms, all of which will affect the safety and stability of the pressure-bearing borehole sealing.

[0041] The basic drilling assembly 100 includes a basic platform 110, a jacking platform 120, jacking guide rods 130, jacking lead screws 140, a drilling platform 150, a jacking motor 160, a grouting drill pipe 170, and a drilling motor 180. The jacking platform 120 is symmetrically arranged above the basic platform 110. The jacking guide rods 130 are evenly arranged between the basic platform 110 and the jacking platform 120, and the jacking guide rods 130 are respectively screwed to the basic platform 110 and the jacking platform 120. The jacking lead screws 140 are symmetrically rotatably connected between the basic platform 110 and the jacking platform 120. First rotating seats 113 are symmetrically arranged on the basic platform 110, and the basic platform 110 is screwed to the first rotating seats 113. A second rotating seat 121 is arranged at the bottom of the jacking platform 120, and the jacking platform 120 is screwed to the second rotating seat 121. The two ends of the jacking lead screw 140 are rotatably connected between the first rotating seat 113 and the second rotating seat 121. Specifically, bearings are arranged in both the first rotating seat 113 and the second rotating seat 121, and the two ends of the jacking lead screw 140 are fixed in the bearings. The two ends of the drilling platform 150 are driven on the surface of the jacking lead screw 140. Screw nuts 152 are arranged at the two ends of the drilling platform 150. The screw nuts 152 are screwed to the drilling platform 150, and the screw nuts 152 are driven on the surface of the jacking lead screw 140.

[0042] Among them, the drilling platform 150 is slidably sleeved on the surface of the jacking guide rod 130. Sliding guide sleeves 151 are evenly arranged on the drilling platform 150. The sliding guide sleeves 151 are screwed to the drilling platform 150 and slidably sleeved on the surface of the jacking guide rod 130, increasing the sliding support precision and strength of the drilling platform 150. The body of the jacking motor 160 is arranged on the jacking platform 120 and screwed to the jacking platform 120. The output end of the jacking motor 160 is transmitted to the upper end of the jacking lead screw 140, and the jacking motor 160 is connected to the jacking lead screw 140 by a coupling. The upper end of the grouting drill pipe 170 rotates inside the drilling platform 150. Specifically, bearings are arranged inside the drilling platform 150, and the upper end of the grouting drill pipe 170 is fixed inside the bearings. The body of the drilling motor 180 is arranged on the drilling platform 150 and screwed to the drilling platform 150. The output end of the drilling motor 180 is transmitted to the upper end of the grouting drill pipe 170. A first belt pulley 181 is arranged at the output end of the drilling motor 180. The first belt pulley 181 is key-connected to the drilling motor 180. A second belt pulley 171 is arranged at the upper end of the grouting drill pipe 170. The second belt pulley 171 is key-connected to the grouting drill pipe 170, and the first belt pulley 181 drives the second belt pulley 171.

[0043] Among them, balance seats 111 are evenly arranged on the top of the foundation platform 110. The balance seats 111 are screwed to the foundation platform 110. Specifically, the balance seats 111 are externally equipped with a balance device to adjust the drilling angle of the pressure-bearing drill hole.

[0044] Move the device to the pressure-bearing drill hole sealing area, and the balance seats 111 are externally equipped with a balance device to adjust the drilling angle of the grouting drill pipe 170. Control the rotation of the grouting drill pipe 170 through the drilling motor 180, and cooperate with the jacking motor 160 to control the drilling feed of the grouting drill pipe 170 to achieve pressure-bearing drilling of the soil. Stop when the drill bit of the grouting drill pipe 170 penetrates into the pressure-bearing groundwater layer. Install a flexible cup-shaped plug at the bottom of the drill hole for partial water stoppage, backfill the drill hole with sand of a certain grading, install the hole-sealing device, and perform grouting and backflow seepage operations in the drill hole until there is no water seeping out of the drill hole, and the hole sealing is completed.

[0045] The edge-expanding and strengthening component 300 includes an edge-expanding table 310, a rotating table 320, a rotating tooth shaft 330, a rotating motor 340, an edge-expanding rail frame 350, an edge-expanding sliding frame 360, and an edge-expanding hydraulic cylinder 370. The edge-expanding table 310 is suspended below the base table 110. Suspension columns 112 are evenly arranged at the bottom of the base table 110. The edge-expanding table 310 is fixed to the lower ends of the suspension columns 112, and the suspension columns 112 are respectively screwed to the base table 110 and the edge-expanding table 310. The rotating table 320 is rotatably connected to the bottom of the edge-expanding table 310. The rotating tooth shafts 330 are symmetrically rotatably connected below the base table 110. Suspension seats 332 are rotatably arranged on the circumferential sides of the rotating tooth shafts 330. Specifically, bearings are arranged in the suspension seats 332, and the rotating tooth shafts 330 are key-mounted in the bearings. The suspension seats 332 are suspended at the bottom of the base table 110, and the suspension seats 332 are screwed to the base table 110. The lower ends of the rotating tooth shafts 330 are engaged with the surface of the rotating table 320. A rotating tooth ring 321 is arranged in the rotating table 320. The rotating tooth ring 321 is screwed to the rotating table 320. A rotating gear 331 is arranged at the lower end of the rotating tooth shaft 330. The rotating tooth shaft 330 is key-connected to the rotating gear 331, and the rotating gear 331 is engaged with the rotating tooth ring 321.

[0046] Among them, the body of the rotating motor 340 is suspended below the base table 110. The body of the rotating motor 340 is fixed to the suspension seat 332, and the rotating motor 340 is screwed to the suspension seat 332. The output end of the rotating motor 340 is transmitted to the upper end of the rotating tooth shaft 330. A third belt pulley 341 is fixed to the output end of the rotating motor 340. The third belt pulley 341 is key-connected to the rotating motor 340. A fourth belt pulley 333 is fixed to the upper end of the rotating tooth shaft 330. The fourth belt pulley 333 is key-connected to the rotating tooth shaft 330. The third belt pulley 341 is transmitted to the fourth belt pulley 333. The edge-expanding rail frames 350 are evenly arranged on the circumferential side of the rotating table 320. Angle platforms 322 are arranged on the circumferential side of the rotating table 320. The angle platforms 322 are welded to the rotating table 320. The edge-expanding rail frames 350 are arranged on the angle platforms 322, and the edge-expanding rail frames 350 are screwed to the angle platforms 322. The edge-expanding sliding frame 360 slides on the surface of the edge-expanding rail frame 350. The edge-expanding sliding frame 360 slides on the surface of the edge-expanding rail frame 350 through sliders. The cylinder body of the edge-expanding hydraulic cylinder 370 is arranged on the edge-expanding sliding frame 360. The edge-expanding hydraulic cylinder 370 is screwed to the edge-expanding sliding frame 360. One end of the piston rod of the edge-expanding hydraulic cylinder 370 is fixed to the edge-expanding rail frame 350, and the edge-expanding hydraulic cylinder 370 is screwed to the edge-expanding rail frame 350.

[0047] The cofferdam strengthening component 500 includes a cofferdam hydraulic cylinder 510, a scraping tool 520, a positioning guide rod 530, an edge-expanding tool 540, a strengthening hydraulic cylinder 550, a cementing liquid nozzle 560, and a bacterial liquid nozzle 570. The body of the cofferdam hydraulic cylinder 510 is evenly arranged on one set of edge-expanding sliding frames 360, and the cofferdam hydraulic cylinder 510 is screwed to the edge-expanding sliding frame 360. The scraping tools 520 are symmetrically arranged at one end of the piston rod of the cofferdam hydraulic cylinder 510. A tool rest 521 is arranged between the scraping tools 520. The tool rest 521 is fixed at one end of the piston rod of the cofferdam hydraulic cylinder 510, and the tool rest 521 is screwed to the scraping tools 520 and the cofferdam hydraulic cylinder 510 respectively. The lower ends of the positioning guide rods 530 are evenly arranged at one end of the piston rod of the cofferdam hydraulic cylinder 510. The lower ends of the positioning guide rods 530 are evenly arranged on the tool rest 521, and the positioning guide rods 530 are screwed to the tool rest 521. The upper ends of the positioning guide rods 530 slide through the edge-expanding sliding frame 360, increasing the support strength of the scraping tool 520. The edge-expanding tool 540 is arranged at one end of the piston rod of the cofferdam hydraulic cylinder 510 between the scraping tools 520. The edge-expanding tool 540 is fixed to the bottom of the tool rest 521, and the edge-expanding tool 540 is screwed to the tool rest 521.

[0048] Among them, the body of the strengthening hydraulic cylinder 550 is evenly arranged on one set of edge-expanding sliding frames 360, and the strengthening hydraulic cylinder 550 is screwed to the edge-expanding sliding frame 360. The cementing liquid nozzle 560 is arranged at one end of the piston rod of the strengthening hydraulic cylinder 550. A connecting seat 551 is arranged at one end of the piston rod of the strengthening hydraulic cylinder 550. The cementing liquid nozzle 560 is arranged at one end of the connecting seat 551, and the connecting seat 551 is screwed to the strengthening hydraulic cylinder 550 and the cementing liquid nozzle 560 respectively. The upper end of the cementing liquid nozzle 560 is communicated with a cementing liquid cylinder 561. Specifically, the cementing liquid cylinder 561 is a solution of urea and CaCl2. The bacterial liquid nozzle 570 is arranged at one end of the piston rod of the strengthening hydraulic cylinder 550. The bacterial liquid nozzle 570 is arranged at the other end of the connecting seat 551, and the connecting seat 551 is screwed to the bacterial liquid nozzle 570. The upper end of the bacterial liquid nozzle 570 is communicated with a bacterial liquid cylinder 571. Specifically, microorganisms in the bacterial liquid cylinder 571 produce urease to decompose urea to generate carbonate ions and ammonium ions, and calcium carbonate is generated in the presence of calcium ions in the soil, thereby cementing the soil particles and improving the bearing capacity, stiffness, and erosion resistance of the foundation.

[0049] According to the support radius around the bearing pressure borehole, the expansion radius of the scraping tool 520 is controlled by some of the edge-expanding hydraulic cylinders 370, the lifting and feeding of the scraping tool 520 are adjusted by the cofferdam hydraulic cylinder 510, and the rotation of the rotating table 320 is controlled in cooperation with the rotating motor 340, so as to realize the ring excavation of the soil around the bearing pressure borehole by the scraping tool 520. While the scraping tool 520 excavates the ring-shaped cofferdam, the irregular rock and soil on the inner wall of the ring-shaped cofferdam are also formed into a ring shape under the extrusion of the edge-expanding tool 540 until the scraping tool 520 and the edge-expanding tool 540 stop after excavating to the soil impervious layer.

[0050] According to the support radius of the inner wall of the ring cofferdam, the expansion radius of the cementing liquid nozzle 560 and the bacterial liquid nozzle 570 is controlled by the partial expansion hydraulic cylinder 370, and the lifting and feeding of the cementing liquid nozzle 560 and the bacterial liquid nozzle 570 is controlled by the strengthening hydraulic cylinder 550. In cooperation with the layer-by-layer excavation of the scraping tool 520 and the expansion tool 540, the cementing liquid cylinder 561 and the bacterial liquid cylinder 571 are opened, and the bacterial suspension, urea and CaCl2 solution are poured into the groove of the ring cofferdam to make it leak into the entire support radius around the pressure borehole and outside. Microorganisms produce urease to decompose urea to generate carbonate ions and ammonium ions, and generate calcium carbonate in the presence of calcium ions in the soil, thereby cementing the soil particles and improving the bearing capacity, stiffness and anti-erosion performance of the foundation. By injecting grout into the cofferdam, a pressure-bearing ring layer protection is formed, and the microbial soil calcification of MICP is cooperated to provide strength support for the pressure-bearing borehole. At the same time, grouting in the cofferdam can effectively reduce the loss of calcium carbonate particles in the soil and the acid-base changes in the microbial living environment caused by external water and soil infiltration exchange, and maintain the strength stability of MICP microbial soil calcification.

[0051] like Figures 2-6 As shown in the figure, the traditional MICP grouting technology is to use porous pipes to inject bacterial suspension and cementing liquid into the soil submerged layer. The cementing condition of deep soil particles is difficult to detect, especially the influence of the penetration of the pressurized water layer, which leads to poor cementing effect of soil particles and easy solidification of cement mortar, and unsatisfactory sealing effect.

[0052] The detection and strengthening assembly 700 includes a top-pressing hydraulic cylinder 710, a top-pressing detection body 720, a wall-circling hydraulic cylinder 730, a rotary motor 740 and a wall-circling detection body 750. The cylinder body of the top-pressing hydraulic cylinder 710 is symmetrically arranged on the edge expansion platform 310, and the cylinder body of the top-pressing hydraulic cylinder 710 is provided with a support frame 711, and the support frame 711 is fixed on the edge expansion platform 310, and the support frame 711 is respectively screwed with the top-pressing hydraulic cylinder 710 and the edge expansion platform 310. The top-pressing detection body 720 is arranged at one end of the piston rod of the top-pressing hydraulic cylinder 710, and the top-pressing detection body 720 is screwed with the top-pressing hydraulic cylinder 710. The cylinder body of the wall-circling hydraulic cylinder 730 is evenly arranged on one group of the edge expansion slides 360, and the wall-circling hydraulic cylinder 730 is screwed with the edge expansion slides 360. The body of the rotary motor 740 is arranged at one end of the piston rod of the annular wall hydraulic cylinder 730, and a bracket 731 is arranged at one end of the piston rod of the annular wall hydraulic cylinder 730. The body of the rotary motor 740 is fixed on the bracket 731, and the bracket 731 is respectively screwed with the annular wall hydraulic cylinder 730 and the rotary motor 740. The annular wall detection body 750 is arranged at the output end of the rotary motor 740, and the annular wall detection body 750 is screwed with the rotary motor 740.

[0053] The expansion radius of the ring wall detection main body 750 is controlled by the partial edge-expanding hydraulic cylinder 370, the lifting and feeding of the ring wall detection main body 750 is controlled by the ring wall hydraulic cylinder 730, the detection surface direction of the ring wall detection main body 750 is controlled by the rotary motor 740, and the rotation of the rotating table 320 is controlled by the rotating motor 340 to perform a full-range detection on the deep soil calcification of the inner wall of the cofferdam. The local soil is timely supplemented with calcification by controlling the cementitious liquid nozzle 560 and the bacterial liquid nozzle 570, so as to improve the effect of soil calcification around the pressure-bearing borehole and reduce the influence of the dilution of the local soil effect calcification caused by the seepage of the confined water. The falling of the top pressure detection main body 720 is controlled by the top pressure hydraulic cylinder 710 to perform soil calcification detection on the drilling area of the grouting drill pipe 170. In cooperation with the detection of the inner wall of the cofferdam, a full-range detection of the soil calcification in the pressure-bearing borehole area is realized, the detection dead angle is reduced, and the project quality is improved.

[0054] As Figures 1-6 shown, the pressure-bearing borehole sealing device based on MICP according to the embodiment of the present application includes the following method:

[0055] Adjust the angle of the drilling platform, control the rotation and lifting and feeding of the drill pipe through the motor until it stops after drilling into the confined groundwater layer, install a flexible cup-shaped plug at the bottom of the borehole for partial water stop, backfill the borehole with sand of a certain grading, install the sealing device, and perform grouting and reflux seepage operations in the borehole until there is no water seeping out of the borehole, and the sealing is completed;

[0056] The excavation radius and lifting and feeding are controlled by hydraulic pressure, and the rotation of the excavation tool around the drill pipe is controlled by the motor to perform layer-by-layer excavation of the soil in a ring shape. By pouring the bacterial suspension and urea and CaCl2 solutions into the excavation ring groove, microorganisms are induced to produce urease to decompose urea to generate carbonate ions and ammonium ions, and calcium carbonate is generated in the presence of calcium ions in the soil, thereby cementing the soil particles together to improve the bearing capacity, stiffness, and erosion resistance of the foundation;

[0057] The deep soil calcification of the inner wall of the excavation ring groove is detected by the detection device, and the calcification of the rotating rod area is detected by the detection device. The full-range detection of the soil calcification in the pressure-bearing borehole area is carried out in real time, the detection dead angle is reduced, and rework is carried out in time to improve the project quality. After the detection is qualified, grouting is carried out into the ring groove to form a pressure-bearing ring layer for protection. In cooperation with the microbial soil calcification of MICP, the pressure-bearing borehole is jointly supported in strength, and the loss of calcium carbonate particles inside the soil and the acid-base change of the microbial living environment caused by the external water and soil seepage exchange are reduced, and the strength stability of the MICP microbial soil calcification is maintained.

[0058] Specifically, the working principle of the MICP-based pressure-bearing borehole sealing device and method: Move the device to the pressure-bearing borehole sealing area, and adjust the drilling angle of the grouting drill rod 170 with the balance device hanging on the balance seat 111. Control the rotation of the grouting drill rod 170 through the drilling motor 180, and cooperate with the jacking motor 160 to control the drilling feed of the grouting drill rod 170 to achieve pressure-bearing drilling of the soil. Stop after the drill bit of the grouting drill rod 170 penetrates into the pressure-bearing groundwater layer. Install a flexible cup-shaped plug at the bottom of the borehole for partial water stop, backfill the borehole with sand of a certain grading, install the sealing device, and perform grouting and backflow seepage operations in the borehole until there is no water seeping out of the borehole, and the sealing is completed.

[0059] According to the support radius around the pressure-bearing borehole, control the expansion radius of the scraping tool 520 through the partial edge-expanding hydraulic cylinder 370, adjust the lifting feed of the scraping tool 520 through the cofferdam hydraulic cylinder 510, and cooperate with the rotation motor 340 to control the rotation of the rotating table 320 to achieve the ring excavation of the soil around the pressure-bearing borehole by the scraping tool 520. While the scraping tool 520 excavates the ring cofferdam, the irregular rock and soil on the inner wall of the ring cofferdam also form a ring shape under the extrusion of the edge-expanding tool 540 until the scraping tool 520 and the edge-expanding tool 540 stop after excavating to the soil impervious layer.

[0060] Furthermore, according to the support radius of the inner wall of the ring cofferdam, control the expansion radius of the cementing liquid nozzle 560 and the bacterial liquid nozzle 570 through the partial edge-expanding hydraulic cylinder 370, and control the lifting feed of the cementing liquid nozzle 560 and the bacterial liquid nozzle 570 through the strengthening hydraulic cylinder 550. Cooperate with the layer-by-layer excavation of the scraping tool 520 and the edge-expanding tool 540, open the cementing liquid cylinder 561 and the bacterial liquid cylinder 571, and pour the bacterial suspension and urea and CaCl2 solutions into the groove of the ring cofferdam, so that they leak into the entire area inside and outside the support radius around the pressure-bearing borehole. Microorganisms produce urease to decompose urea to generate carbonate ions and ammonium ions, and calcium carbonate is generated in the presence of calcium ions in the soil, thereby cementing the soil particles together to improve the foundation bearing capacity, stiffness, and erosion resistance. By grouting into the cofferdam, a pressure-bearing ring layer is formed for protection, and together with the microbial soil calcification of MICP, it provides strength support for the pressure-bearing borehole. At the same time, grouting in the cofferdam can effectively reduce the loss of calcium carbonate particles inside the soil caused by external water and soil infiltration exchange and the acid-base change of the microbial living environment, and maintain the strength stability of MICP microbial soil calcification.

[0061] In addition, the expansion radius of the ring wall detection main body 750 is controlled by the partial edge-expanding hydraulic cylinder 370, the lifting and feeding of the ring wall detection main body 750 is controlled by the ring wall hydraulic cylinder 730, the detection surface direction of the ring wall detection main body 750 is controlled by the rotary motor 740, and in cooperation with the rotation of the rotating table 320 controlled by the rotating motor 340, the deep soil calcification of the inner wall of the cofferdam is detected in all directions. The local soil layer is timely supplemented with calcification by controlling the cementitious liquid nozzle 560 and the bacterial liquid nozzle 570, so as to improve the effect of soil calcification around the pressure-bearing borehole and reduce the influence of the dilution of the local soil effect calcification caused by the seepage of the confined water. The top pressure detection main body 720 is controlled by the top pressure hydraulic cylinder 710 to drop to detect the soil calcification in the drilling area of the grouting drill pipe 170. In cooperation with the detection of the inner wall of the cofferdam, the all-round detection of the soil calcification in the pressure-bearing borehole area is realized, the detection dead angle is reduced, and the project quality is improved.

[0062] It should be noted that the specific model specifications of the jacking motor 160, the drilling motor 180, the rotating motor 340, the edge-expanding hydraulic cylinder 370, the cofferdam hydraulic cylinder 510, the strengthening hydraulic cylinder 550, the top pressure hydraulic cylinder 710, the top pressure detection main body 720, the ring wall hydraulic cylinder 730, the rotary motor 740, and the ring wall detection main body 750 need to be selected according to the actual specifications of the device. The specific selection calculation method adopts the existing technology in this field, so it will not be elaborated in detail.

[0063] The power supply and its principle of the jacking motor 160, the drilling motor 180, the rotating motor 340, the edge-expanding hydraulic cylinder 370, the cofferdam hydraulic cylinder 510, the strengthening hydraulic cylinder 550, the top pressure hydraulic cylinder 710, the top pressure detection main body 720, the ring wall hydraulic cylinder 730, the rotary motor 740, and the ring wall detection main body 750 are clear to those skilled in the art and will not be described in detail here.

[0064] The above are only the embodiments of the present application and are not used to limit the protection scope of the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application. It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

Claims

1. A pressure-bearing borehole sealing device based on MICP, characterized in that, include A basic drilling assembly (100), the basic drilling assembly (100) comprising a base platform (110), a lifting platform (120), a lifting guide rod (130), a lifting screw (140), a drilling platform (150), a lifting motor (160), a grouting drill rod (170) and a drilling motor (180), the lifting platform (120) being symmetrically arranged above the base platform (110), the lifting guide rod (130) being evenly arranged between the base platform (110) and the lifting platform (120), and the lifting screw (140) being symmetrically rotatably connected to the base platform (110) and the lifting platform (1 20), the two ends of the drilling platform (150) are driven on the surface of the lifting screw (140), the drilling platform (150) is slidably sleeved on the surface of the lifting guide rod (130), the lifting motor (160) is arranged on the lifting platform (120), the output end of the lifting motor (160) is driven on the upper end of the lifting screw (140), the upper end of the grouting drill rod (170) rotates in the drilling platform (150), the drilling motor (180) is arranged on the drilling platform (150), and the output end of the drilling motor (180) is driven on the upper end of the grouting drill rod (170); The edge expansion and strengthening component (300) comprises an edge expansion platform (310), a rotating platform (320), a rotating gear shaft (330), a rotating motor (340), an edge expansion rail frame (350), an edge expansion slide frame (360) and an edge expansion hydraulic cylinder (370), wherein the edge expansion platform (310) is suspended below the base platform (110), the rotating platform (320) is rotatably connected to the bottom of the edge expansion platform (310), the rotating gear shaft (330) is symmetrically rotatably connected to the bottom of the base platform (110), and the lower end of the rotating gear shaft (330) is The rotating motor (340) is meshed with the surface of the rotating platform (320), the rotating motor (340) is suspended below the base platform (110), the output end of the rotating motor (340) is transmitted to the upper end of the rotating gear shaft (330), the edge expansion rail frame (350) is evenly arranged around the rotating platform (320), the edge expansion slide (360) slides on the surface of the edge expansion rail frame (350), the cylinder body of the edge expansion hydraulic cylinder (370) is arranged on the edge expansion slide (360), and one end of the piston rod of the edge expansion hydraulic cylinder (370) is fixed on the edge expansion rail frame (350); The top of the base platform (110) is evenly provided with a balancing seat (111), the bottom of the base platform (110) is evenly provided with a suspension column (112), and the edge expansion platform (310) is fixed to the lower end of the suspension column (112); A first rotating seat (113) is symmetrically arranged on the base platform (110), a second rotating seat (121) is arranged at the bottom of the lifting platform (120), and both ends of the lifting screw (140) are rotatably connected between the first rotating seat (113) and the second rotating seat (121); Sliding guide sleeves (151) are evenly arranged on the drilling platform (150), and the sliding guide sleeves (151) are slidably sleeved on the surface of the lifting guide rod (130).

2. The pressure-bearing borehole sealing device based on MICP according to claim 1, characterized in that, The output end of the drilling motor (180) is provided with a first belt pulley (181), the upper end of the grouting drill rod (170) is provided with a second belt pulley (171), and the first belt pulley (181) is driven by the second belt pulley (171).

3. The pressure-bearing borehole sealing device based on MICP according to claim 1, wherein, Screw nuts (152) are provided at both ends of the drilling platform (150), and the screw nuts (152) are driven on the surface of the lifting screw (140).

4. The pressure-bearing borehole sealing device based on MICP according to claim 1, characterized in that, A rotating ring gear (321) is arranged inside the rotating platform (320), a rotating gear (331) is arranged at the lower end of the rotating gear shaft (330), and the rotating gear (331) is meshed with the rotating ring gear (321).

5. The pressure-bearing borehole sealing device based on MICP according to claim 1, characterized in that, A suspension seat (332) is rotatably arranged around the rotating gear shaft (330); the suspension seat (332) is suspended at the bottom of the base platform (110); and the body of the rotating motor (340) is fixed on the suspension seat (332).

6. The pressure-bearing borehole sealing device based on MICP according to claim 1, characterized in that, A third pulley (341) is fixed to the output end of the rotating motor (340), a fourth pulley (333) is fixed to the upper end of the rotating gear shaft (330), and the third pulley (341) is driven by the fourth pulley (333).

7. A pressure-bearing borehole sealing method based on MICP, which utilizes a pressure-bearing borehole sealing device based on MICP according to any one of claims 1-6, characterized in that, Includes the following methods: Adjust the drilling platform angle, control the rotation and lifting of the drill rod through the motor, and stop drilling after entering the pressurized groundwater layer. Install a flexible cup-shaped plug at the bottom of the borehole to partially stop water, backfill the borehole with sand and soil of a certain grade, install the sealing device, and perform grouting and backflow seepage operations in the borehole until no water seeps out of the borehole and the sealing is completed; The excavation radius and lifting feed of the tool are controlled by hydraulic pressure, and the rotation of the excavation tool around the drill rod is controlled by a motor to excavate the soil layer by layer. By injecting bacterial suspension, urea and CaCl2 solution into the excavation ring groove, microorganisms are induced to produce urease to decompose urea to produce carbonate ions and ammonium ions. Calcium carbonate is generated in the presence of calcium ions in the soil, thereby cementing the soil particles and improving the bearing capacity, stiffness and erosion resistance of the foundation. The deep soil layer on the inner wall of the excavated ring groove is tested for calcification through the detection device, and the calcification of the rotating rod area is tested through the detection device. The soil calcification in the pressure-bearing drilling area is tested in real time and comprehensively to reduce the detection blind spots, timely rework and improve the project quality. After the test is qualified, grouting is injected into the ring groove to form a pressure-bearing ring layer protection, and the microbial soil calcification of MICP is used to provide strength support for the pressure-bearing drilling hole, reduce the loss of calcium carbonate particles in the soil caused by external water and soil infiltration exchange and the acid-base changes in the microbial living environment, and maintain the strength stability of MICP microbial soil calcification.

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