CN117779742A - Regional directional grouting system and method combining freezing and dewatering in water-rich region - Google Patents
Regional directional grouting system and method combining freezing and dewatering in water-rich region Download PDFInfo
- Publication number
- CN117779742A CN117779742A CN202410199212.0A CN202410199212A CN117779742A CN 117779742 A CN117779742 A CN 117779742A CN 202410199212 A CN202410199212 A CN 202410199212A CN 117779742 A CN117779742 A CN 117779742A
- Authority
- CN
- China
- Prior art keywords
- grouting
- pipe
- freezing
- precipitation
- dewatering
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000007710 freezing Methods 0.000 title claims abstract description 93
- 230000008014 freezing Effects 0.000 title claims abstract description 88
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000001556 precipitation Methods 0.000 claims abstract description 93
- 239000002002 slurry Substances 0.000 claims abstract description 20
- 238000010276 construction Methods 0.000 claims abstract description 12
- 238000009792 diffusion process Methods 0.000 claims abstract description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 94
- 239000007788 liquid Substances 0.000 claims description 52
- 229910052757 nitrogen Inorganic materials 0.000 claims description 47
- 238000003860 storage Methods 0.000 claims description 17
- 238000007789 sealing Methods 0.000 claims description 16
- 239000002689 soil Substances 0.000 claims description 15
- 238000013461 design Methods 0.000 claims description 12
- 238000005553 drilling Methods 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 11
- 239000004576 sand Substances 0.000 claims description 11
- 230000000694 effects Effects 0.000 claims description 8
- 238000012544 monitoring process Methods 0.000 claims description 8
- 238000010257 thawing Methods 0.000 claims description 7
- 230000018044 dehydration Effects 0.000 claims description 3
- 238000006297 dehydration reaction Methods 0.000 claims description 3
- 238000001704 evaporation Methods 0.000 claims description 3
- 238000011065 in-situ storage Methods 0.000 claims description 3
- 238000011835 investigation Methods 0.000 claims description 3
- 239000013049 sediment Substances 0.000 claims description 3
- 230000007480 spreading Effects 0.000 claims description 3
- 238000003892 spreading Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 2
- 238000012354 overpressurization Methods 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 239000011800 void material Substances 0.000 claims description 2
- 239000007789 gas Substances 0.000 claims 3
- 238000007569 slipcasting Methods 0.000 claims 3
- 238000009827 uniform distribution Methods 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 6
- 230000007547 defect Effects 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 230000006698 induction Effects 0.000 abstract description 2
- 238000011282 treatment Methods 0.000 description 5
- 239000011440 grout Substances 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 238000003895 groundwater pollution Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Landscapes
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention relates to a zonal directional grouting system and a zonal directional grouting method for freezing-dewatering combination in a water-rich area, the grouting system comprises a freezing system, a grouting system, a precipitation system, an intelligent control system and a precipitation grouting multifunctional sleeve assembly; the freezing system, the grouting system and the precipitation system are all connected with the intelligent control system, and the grouting system, the precipitation system and the precipitation grouting multifunctional sleeve component are matched for use. The invention combines freezing and precipitation to form a freezing wall to limit the entry of external water and limit the slurry diffusion flow area, dewatering grouting synchronously realizes the induction of the slurry diffusion direction, solves the defects of the traditional grouting method in the high water level area, and the method has the advantages of high construction efficiency, good environmental benefit and the like.
Description
Technical Field
The invention relates to the technical field of foundation treatment, in particular to a zonal directional grouting system and a grouting method for freezing-dewatering combination in a water-rich area.
Background
Foundation treatments are visible everywhere during construction, grouting technology is widely used for foundation reinforcement in various construction processes, soil performance is improved, voids are filled, and the structure is stabilized by injecting grouting material into the subsurface.
The conventional grouting method has great limitation in controlling the direction and distribution of the grout after being injected into the ground, and frequently encounters problems such as uncontrolled diffusion, low utilization efficiency of grouting materials, and inability to be injected into specific areas of the ground effectively, resulting in poor stability, transfer of grouting material, etc., resulting in increased cost and reduced efficiency of the grouting operation. Moreover, existing methods do not adequately address the challenges of traversing various geological formations and ensuring efficient distribution of grouting material to predetermined areas. Therefore, it is necessary to develop a directional induced grouting technique in high water level areas.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides a zonal directional grouting system and a grouting method for freezing-precipitation combination in a water-rich area.
The invention adopts the following technical scheme to realize the aim:
the regional directional grouting system combining freezing and precipitation in the water-rich region comprises a freezing system, a grouting system, a precipitation system, an intelligent control system and a precipitation grouting multifunctional sleeve component; the freezing system, the grouting system and the precipitation system are all connected with the intelligent control system, and the grouting system, the precipitation system and the precipitation grouting multifunctional sleeve component are matched for use.
The freezing system comprises a liquid nitrogen storage tank, the liquid nitrogen storage tank is connected with a liquid supply pipe through a liquid nitrogen pump, the liquid supply pipe is connected with a freezing pipe main pipe, the freezing pipe main pipe is communicated with a plurality of freezing pipe branch pipes, freezing pipe outer sleeves are arranged outside the freezing pipe branch pipes, the upper ends of the plurality of freezing pipe outer sleeves are connected with a collecting pipe, the collecting pipe is connected with a return pipe, the return pipe is connected with the liquid nitrogen storage tank, and the freezing pipe branch pipes and the lower ends of the freezing pipe outer sleeves are arranged in freezing holes drilled in a grouting area.
The grouting system comprises a grouting pool, wherein the grouting pool is connected with a grouting pipe through a grouting pipe and a grouting pump, and the grouting pipe is connected with a precipitation grouting multifunctional sleeve component.
The dewatering system comprises a drain pipe, a vacuum pipe and a sealing gasket, wherein the sealing gasket is arranged at the port of the dewatering grouting multifunctional sleeve assembly, the drain pipe and the vacuum pipe penetrate through the sealing gasket and extend into the dewatering grouting multifunctional sleeve assembly, the bottom of the drain pipe is connected with a submersible pump, a filtering sleeve is arranged outside the submersible pump, and the outer end of the vacuum pipe is connected with a vacuum pump.
The intelligent control system comprises an indoor control center, a flow rate sensor, a pressure sensor, a temperature sensor and an acoustic sensor, wherein the flow rate sensor, the pressure sensor, the temperature sensor and the acoustic sensor are all connected with the indoor control center, the flow rate sensor and the pressure sensor are arranged in the precipitation grouting multifunctional sleeve assembly, the temperature sensor is arranged at the inner bottom of the freezing pipe outer sleeve, and the acoustic sensor is arranged at the inner bottom of the precipitation grouting multifunctional sleeve assembly.
The multifunctional sleeve assembly for the dewatering grouting comprises a dewatering grouting outer sleeve, the dewatering grouting outer sleeve is arranged in a dewatering grouting dual-purpose hole drilled in a grouting area, a dewatering grouting inner pipe is arranged in the dewatering grouting outer sleeve, a sand filling layer is arranged between the dewatering grouting outer sleeve and the dewatering grouting inner pipe, a plurality of through holes are uniformly formed in the lower end of the outer side wall of the dewatering grouting inner pipe, and a flow velocity sensor and a pressure sensor are arranged in the through holes.
The regional directional grouting method for the freezing-precipitation combination of the water-rich region utilizes the regional directional grouting system for the freezing-precipitation combination of the water-rich region, and comprises the following steps of:
s1, performing on-site investigation and test, knowing the soil characteristics, the underground water conditions and a specific area needing grouting, and determining the length of a grouting section, the grouting hole distance and the grouting pressure;
s2, drilling freezing holes on the periphery of a grouting area of the stratum to be reinforced according to design requirements, arranging a freezing system, and simultaneously drilling dual-purpose holes for dewatering and grouting in the grouting area according to design rules;
s3, extracting liquid nitrogen from the liquid nitrogen storage tank, conveying the liquid nitrogen to the bottom of the freezing pipe branch pipe through a liquid nitrogen pump, a liquid supply pipe and a freezing pipe main pipe, ejecting the liquid nitrogen from an orifice at the bottom of the freezing pipe branch pipe, contacting with soil and quickly evaporating the liquid nitrogen into a gaseous state, refluxing the gaseous nitrogen from an outer sleeve of the freezing pipe to a collecting pipe and a reflux pipe, and finally conveying the gaseous nitrogen to the liquid nitrogen storage tank to form a closed circulation system, wherein in the process, the liquid nitrogen continuously absorbs heat in the soil to reduce the temperature of the soil and freeze moisture into ice, and repeating the operation in the step S3 until a freezing wall with enough thickness and strength is formed;
s4, arranging a grouting system and a dewatering system according to the design, arranging a dewatering grouting outer sleeve and a dewatering grouting inner pipe in a dewatering grouting dual-purpose hole, and filling gaps between the dewatering grouting outer sleeve and the dewatering grouting inner pipe with sand to form a sand filling layer;
s5, pulling out the outer sleeve of the dewatering grouting, connecting the inner pipe of the dewatering grouting at one of the two-purpose holes of the dewatering grouting with the grouting pipe, and simultaneously placing the submersible pump, the drain pipe and the vacuum pipe in the inner pipe of the dewatering grouting at the adjacent two-purpose hole of the dewatering grouting along the design direction and sealing by using a sealing gasket;
s6, grouting slurry into the inner precipitation grouting pipe at the first precipitation grouting dual-purpose hole from the grouting pipe, ensuring stable flow speed and pressure, gradually pulling out the inner precipitation grouting pipe outwards while grouting, simultaneously pumping out water and air in the inner precipitation grouting pipe at the adjacent precipitation grouting dual-purpose hole by utilizing a vacuum pump and a vacuum pipe, generating hydraulic gradient and negative pressure, keeping the inner precipitation grouting pipe in situ, promoting slurry to flow to the adjacent precipitation grouting dual-purpose hole, enabling the submersible pump to work, and enabling the bottom of the submersible pump to be flush with a through hole on the side wall of the inner precipitation grouting pipe;
s7, stopping grouting operation at the first dual-purpose hole for precipitation and grouting when slurry appears in the drain pipe, moving the precipitation system to the next dual-purpose hole for precipitation and grouting, and placing the grouting system at the position of the adjacent dual-purpose hole for precipitation and grouting in the step S6;
s8, repeating the step S4-the step S7, wherein the intelligent control system receives information of each sensor in the process, continuously monitors grouting flow, pressure, dehydration rate and acoustic signals, ensures construction effect and safety, and adjusts the precipitation rate according to the requirement so as to control the flow direction and spreading of slurry;
and S9, stopping grouting and dewatering operation after grouting reaches the required coverage area and density, removing equipment as required and recovering the site.
In the step S2, the freezing hole and the dual-purpose hole for precipitation and grouting are processed in a vertical drilling mode, the freezing hole and the dual-purpose hole for precipitation and grouting are cleaned after drilling, and a sleeve and a water stopper are installed to ensure that sediment is not generated in the holes; in the step S, the temperature of the outer sleeve of the freezing pipe is monitored, and the flow and the speed of liquid nitrogen are regulated according to actual conditions, so that the required freezing level is ensured to be reached and maintained.
In step S8, grouting pressure and flow rate are monitored to ensure uniform grouting distribution, excessive pressurization is avoided, the intelligent control system receives signals of the acoustic sensor, uniformity, compactness and quality of grouting are evaluated by analyzing the acoustic signals, the diffusion condition of grouting materials in an underground space is monitored, grouting progress and coverage are fed back in real time, any gap or weak grouting area is found in the monitoring process, and additional grouting is performed to ensure complete and effective coverage.
After the construction activity of step S9 is completed, the supply of liquid nitrogen is stopped, the ground is naturally thawed or the thawing is accelerated by using warm water and steam, the thawing process is monitored to ensure stability and manage potential water burst.
The beneficial effects of the invention are as follows: according to the invention, by combining freezing and precipitation, the freezing wall is formed to limit the external water to enter and limit the slurry diffusion flow area, the precipitation grouting is synchronous to realize the induction of the slurry diffusion direction, the defects of the traditional grouting method in the high water level area are overcome, and the method has the advantages of high construction efficiency, good environmental benefit and the like.
Drawings
FIG. 1 is a schematic diagram of a zonal directional grouting system for freeze-precipitation combination in a water-rich region according to the present invention;
FIG. 2 is a schematic view of a freezing system according to the present invention;
FIG. 3 is a schematic cross-sectional view of a freeze wall formed in the present invention and a drilled dual purpose dewatering and grouting hole;
FIG. 4 is a schematic plan view of the grouting system and the dewatering system of the present invention operating for the first time in synchronization;
FIG. 5 is a schematic plan view of the grouting system and the dewatering system of the present invention operating synchronously for the second time;
FIG. 6 is a schematic diagram of a grouting system, precipitation grouting multifunctional sleeve assembly of the present invention;
FIG. 7 is a schematic diagram of the structure of a submersible pump and a filter sleeve in the inner pipe of the dewatering grouting of the invention;
FIG. 8 is a schematic view of the structure of the through hole on the side wall of the inner pipe of the water-reducing grouting;
FIG. 9 is a schematic plan view of a grouting sequence according to the present invention;
in the figure: 1-a freezing system; 2-grouting system; 3-a precipitation system; 4-an intelligent control system; 5-a water-reducing grouting multifunctional sleeve assembly; 6-dual-purpose hole for precipitation and grouting; 7-freezing the wall; 8-stratum to be reinforced; 9-a grouted area;
11-a liquid nitrogen storage tank; 12-a liquid nitrogen pump; 13-a liquid supply pipe; 14-freezing the main pipe; 15-freezing the branch pipe; 16-freezing pipe outer sleeve; 17-a return pipe; 18-a header pipe; 19-freezing the wells;
21-a slurry storage tank; 22-a slurry suction pipe; 23-grouting pump; 24-grouting pipe;
31-a drain pipe; 32-submersible pump; 33-a filter sleeve; 34-a vacuum pump; 35-vacuum tube; 36-sealing gasket;
41-an indoor control center; 42-a flow rate sensor; 43-pressure sensor; 44-a temperature sensor; 45-an acoustic sensor;
51-a water-reducing grouting outer sleeve; 52-grouting the inner pipe by water dropping; 53-sand filling layer; 54-through holes;
81-filling soil on the upper layer; 82-pebble layer; 83-sandy mudstone;
the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Detailed Description
The principles and features of the present invention are described below with reference to the drawings, the illustrated embodiments are provided for illustration only and are not intended to limit the scope of the present invention. The invention is more particularly described by way of example in the following paragraphs with reference to the drawings. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the invention.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When a component is considered to be "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
as shown in fig. 1 to 9, the regional directional grouting system combining freezing and precipitation in the water-rich region comprises a freezing system 1, a grouting system 2, a precipitation system 3, an intelligent control system 4 and a precipitation grouting multifunctional sleeve assembly 5; the freezing system 1, the grouting system 2 and the precipitation system 3 are all connected with the intelligent control system 4, and the grouting system 2, the precipitation system 3 and the precipitation grouting multifunctional sleeve assembly 5 are matched for use.
The freezing system 1 comprises a liquid nitrogen storage tank 11, the liquid nitrogen storage tank 11 is connected with a liquid supply pipe 13 through a liquid nitrogen pump 12, the liquid supply pipe 13 is connected with a freezing pipe main pipe 14, the freezing pipe main pipe 14 is communicated with a plurality of freezing pipe branch pipes 15, a freezing pipe outer sleeve 16 is arranged outside the freezing pipe branch pipes 15, the upper ends of the plurality of freezing pipe outer sleeves 16 are connected with a collecting pipe 18, the collecting pipe 18 is connected with a return pipe 17, the return pipe 17 is connected with the liquid nitrogen storage tank 11, and the freezing pipe branch pipes 15 and the lower ends of the freezing pipe outer sleeves 16 are arranged in freezing holes 19 drilled in a grouting area.
The grouting system 2 comprises a grouting pool 21, the grouting pool 21 is connected with a grouting pipe 24 through a grouting pipe 22 and a grouting pump 23, and the grouting pipe 24 is connected with the precipitation grouting multifunctional sleeve assembly 5.
The dewatering system 3 comprises a drain pipe 31, a vacuum pipe 35 and a sealing gasket 36, wherein the sealing gasket 36 is arranged at the port of the dewatering grouting multifunctional sleeve assembly 5, the drain pipe 31 and the vacuum pipe 35 penetrate through the sealing gasket 36 and extend into the dewatering grouting multifunctional sleeve assembly 5, a submersible pump 32 is connected to the bottom of the drain pipe 31, a filter sleeve 33 is arranged outside the submersible pump 32, and a vacuum pump 34 is connected to the outer end of the vacuum pipe 35.
The intelligent control system 4 comprises an indoor control center 41, a flow rate sensor 42, a pressure sensor 43, a temperature sensor 44 and an acoustic sensor 45, wherein the flow rate sensor 42, the pressure sensor 43, the temperature sensor 44 and the acoustic sensor 45 are all connected with the indoor control center 41, the flow rate sensor 42 and the pressure sensor 43 are arranged in the precipitation grouting multifunctional sleeve assembly 5, the temperature sensor 44 is arranged at the inner bottom of the freezing pipe outer sleeve 16, and the acoustic sensor 45 is arranged at the inner bottom of the precipitation grouting multifunctional sleeve assembly 5.
The acoustic sensor 45 functions as follows:
monitoring grouting flow in real time: the acoustic sensor 45 may be used to monitor the grouting flow in real time, the acoustic sensor 45 detecting the sound waves generated by the grouting as it passes through the cavity or crack, and by analyzing the change in the sound waves to assess the distribution of grouting material, the filling effect and whether there is an unfilled void or crack, providing data on the flow rate, volume and whether there is an obstacle.
Detection of leaks and voids: the acoustic sensor 45 is very sensitive to changes in sound transmission, is suitable for detecting leaks and voids in the grouted area, and by analyzing the acoustic signal, it is possible to identify areas where the grout is not sufficiently penetrated, thereby improving the structural integrity of the grout by targeted secondary grouting.
And (3) precisely controlling grouting amount: by means of the data collected by the acoustic sensor 45, the intelligent control system 4 can accurately adjust the grouting amount and grouting pressure, ensuring that the material can be evenly distributed, while avoiding unnecessary waste or possible structural damage caused by excessive grouting.
The operation safety is improved: by providing continuous feedback of the grouting process, over grouting, under grouting and other common problems that may lead to structural weakness or failure are facilitated to be prevented, waste is reduced, time is saved, and accident risk is reduced to the greatest extent.
Optimizing the performance of the grouting material: by analyzing the feedback of acoustic signals, the fluidity, the curing time and other performances of the grouting material can be monitored and adjusted in real time so as to adapt to different geological conditions and engineering requirements.
Reducing environmental impact: by detecting the sound level and frequency emitted by the surrounding area, the grouting activity is guaranteed not to adversely affect the nearby structure or ecological system, the risk of material waste and groundwater pollution can be effectively reduced by accurately controlling the grouting process, and the environment protection is facilitated.
Data driven decision support: the collected acoustic data can be used to model the grouting process, provide reference data for future engineering, and make more scientific decisions.
The multifunctional sleeve assembly 5 for water-reducing grouting comprises a water-reducing grouting outer sleeve 51, the water-reducing grouting outer sleeve 51 is arranged in a water-reducing grouting dual-purpose hole 6 drilled in a grouting area, a water-reducing grouting inner tube 52 is arranged in the water-reducing grouting outer sleeve 51, a sand filling layer 53 is arranged between the water-reducing grouting outer sleeve 51 and the water-reducing grouting inner tube 52, a plurality of through holes 54 are uniformly formed in the lower end of the outer side wall of the water-reducing grouting inner tube 52, and the flow velocity sensor 42 and the pressure sensor 43 are arranged in the through holes 54.
The regional directional grouting method for the freezing-precipitation combination of the water-rich region utilizes the regional directional grouting system for the freezing-precipitation combination of the water-rich region, and comprises the following steps of:
s1, performing on-site investigation and test, knowing the soil characteristics, the underground water conditions and a specific area needing grouting, and determining the length of a grouting section, the grouting hole distance and the grouting pressure;
s2, drilling freezing holes 19 at the periphery of a grouting area of the stratum 8 to be reinforced according to design requirements, arranging a freezing system 1, and simultaneously drilling dual-purpose holes 6 for dewatering and grouting in the grouting area according to design requirements;
the stratum 8 to be reinforced comprises an upper layer of filling soil 81, a pebble layer 82 and sandy mudstone 83;
the freezing hole 19 and the dual-purpose hole 6 for precipitation and grouting are processed in a vertical drilling mode, the freezing hole 19 and the dual-purpose hole 6 for precipitation and grouting are cleaned after drilling, and a sleeve and a water stopper are installed to ensure that sediment is not generated in the holes;
s3, extracting liquid nitrogen from the liquid nitrogen storage tank 11, conveying the liquid nitrogen to the bottom of the freezing pipe branch pipe 15 through the liquid nitrogen pump 12, the liquid supply pipe 13 and the freezing pipe main pipe 14, spraying out the liquid nitrogen from an orifice at the bottom of the freezing pipe branch pipe 15, contacting with soil and quickly evaporating to be in a gaseous state, and returning the gaseous nitrogen from the freezing pipe outer sleeve 16 to the collecting pipe 18 and the return pipe 17, and finally conveying the liquid nitrogen to the liquid nitrogen storage tank 11 to form a closed circulation system, wherein in the process, the liquid nitrogen continuously absorbs heat in the soil, so that the temperature of the soil is reduced, and water is frozen into ice, and repeating the operation in the step S3 until a freezing wall 7 with enough thickness and strength is formed;
monitoring the temperature of the freezing pipe outer sleeve 16, and adjusting the flow rate and speed of liquid nitrogen according to actual conditions to ensure that the required freezing level is reached and maintained;
s4, arranging a grouting system 2 and a dewatering system 3 according to the design, arranging a dewatering grouting outer sleeve 51 and a dewatering grouting inner tube 52 in the dewatering grouting dual-purpose hole 6, the gaps between the dewatering grouting outer sleeve 51 and the dewatering grouting inner pipe 52 are filled with sand to form a sand filling layer 53;
s5, pulling out the outer water-reducing grouting sleeve 51, connecting the inner water-reducing grouting pipe 52 at one water-reducing grouting dual-purpose hole 6 (namely, at a position in fig. 4, 5 and 9) with the grouting pipe 24, and simultaneously placing the submersible pump 32, the drain pipe 31 and the vacuum pipe 35 in the inner water-reducing grouting pipe 52 at the adjacent water-reducing grouting dual-purpose hole 6 (namely, at b position in fig. 4, 5 and 9) along the design direction and sealing by using the sealing gasket 36;
s6, grouting slurry is injected into the precipitation grouting inner pipe 52 at the first precipitation grouting dual-purpose hole 6 (namely, at a position a in fig. 4, 5 and 9) from the grouting pipe 24, so that stable flow speed and pressure are ensured, and the precipitation grouting inner pipe 52 is gradually pulled out while grouting, so that a grouting region 9 is formed; simultaneously, the water and air in the inner precipitation grouting pipe 52 adjacent to the two-purpose precipitation grouting holes 6 (namely, the position b in fig. 4, 5 and 9) are pumped out by the vacuum pump 34 and the vacuum pipe 35 to generate a hydraulic gradient and negative pressure, the inner precipitation grouting pipe 52 is kept in situ, slurry is promoted to flow to the positions of the two-purpose precipitation grouting holes 6 adjacent to each other (namely, the position b in fig. 4, 5 and 9), the submersible pump 32 works, and the submersible pump 32 is flush with the through hole 54 on the side wall of the inner precipitation grouting pipe 52 at the bottom;
s7, when slurry exists in the drain pipe 31, stopping grouting operation at the first dual-purpose hole 6 for precipitation and grouting (namely, at a position in fig. 4, 5 and 9), moving the precipitation system 3 to the next dual-purpose hole 6 for precipitation and grouting (namely, at c position in fig. 4, 5 and 9), and placing the grouting system 2 at the position adjacent to the dual-purpose hole 6 for precipitation and grouting in the step S6 (namely, at b position in fig. 4, 5 and 9);
s8, repeating the step S4-the step S7, wherein the intelligent control system 4 receives information of each sensor in the process, continuously monitors grouting flow, pressure, dehydration rate and acoustic signals, ensures construction effect and safety, and adjusts the precipitation rate according to the requirement so as to control the flowing direction and spreading of slurry;
monitoring grouting pressure and flow rate to ensure uniform grouting distribution and avoid over pressurization, the intelligent control system 4 receiving signals of the acoustic sensor 45, evaluating grouting uniformity, compactness and quality by analyzing the acoustic signals, monitoring grouting material diffusion in underground space, feeding back grouting progress and coverage in real time, finding any gap or weak grouting area in the monitoring process, and performing additional grouting to ensure complete and effective coverage;
s9, stopping grouting and dewatering operation after grouting reaches the required coverage area and density, removing equipment and recovering the site according to the requirement; after the construction activity is finished, stopping liquid nitrogen supply, naturally thawing the ground or using warm water and steam to accelerate thawing, monitoring the thawing process to ensure stability and managing potential water burst.
The invention can be well suitable for foundation treatment engineering and other types of foundation treatment engineering in high water level areas such as water-rich sand layers, water-rich cobble layers, water-facing areas, and the like, and particularly in engineering with limited range and slurry diffusion control requirements.
The combined use of freezing and precipitation of the present invention provides for more precise control of the direction of the grout flow.
The invention can ensure the slurry to be accurately conveyed to a required place, reduce unnecessary loss and improve the effectiveness of foundation treatment.
The invention has the advantages of shorter construction period, simple construction process, environment protection and the like.
While the invention has been described above with reference to the accompanying drawings, it will be apparent that the invention is not limited to the above embodiments, but is intended to cover various modifications, either made by the method concepts and technical solutions of the invention, or applied directly to other applications without modification, within the scope of the invention.
Claims (10)
1. The regional directional grouting system combining freezing and precipitation in the water-rich region is characterized by comprising a freezing system (1), a grouting system (2), a precipitation system (3), an intelligent control system (4) and a precipitation grouting multifunctional sleeve assembly (5); freezing system (1), slip casting system (2), precipitation system (3) all are connected with intelligent control system (4), and slip casting system (2), precipitation system (3) and precipitation slip casting multifunctional sleeve pipe subassembly (5) cooperation are used.
2. The zonal directional grouting system for freezing-dewatering combination in water-rich areas according to claim 1, wherein the freezing system (1) comprises a liquid nitrogen storage tank (11), the liquid nitrogen storage tank (11) is connected with a liquid supply pipe (13) through a liquid nitrogen pump (12), the liquid supply pipe (13) is connected with a freezing pipe main pipe (14), the freezing pipe main pipe (14) is communicated with a plurality of freezing pipe branch pipes (15), a freezing pipe outer sleeve (16) is arranged outside the freezing pipe branch pipes (15), the upper ends of the freezing pipe outer sleeves (16) are connected with a collecting pipe (18), the collecting pipe (18) is connected with a return pipe (17), the return pipe (17) is connected with the liquid nitrogen storage tank (11), and the freezing pipe branch pipes (15) and the lower ends of the freezing pipe outer sleeves (16) are arranged in freezing holes (19) drilled in a grouting area.
3. The zoned directional grouting system for freeze-precipitation combination in water-rich areas according to claim 2, wherein the grouting system (2) comprises a grouting pool (21), the grouting pool (21) is connected with a grouting pipe (24) through a grouting pipe (22) and a grouting pump (23), and the grouting pipe (24) is connected with the precipitation grouting multifunctional sleeve assembly (5).
4. The zonal directional grouting system for freezing-dewatering combination in water-rich areas according to claim 3, wherein the dewatering system (3) comprises a drain pipe (31), a vacuum pipe (35) and a sealing gasket (36), the sealing gasket (36) is arranged at a port of the water-reducing grouting multifunctional sleeve assembly (5), the drain pipe (31) and the vacuum pipe (35) penetrate through the sealing gasket (36) to extend into the water-reducing grouting multifunctional sleeve assembly (5), a submersible pump (32) is connected to the bottom of the drain pipe (31), a filtering sleeve (33) is arranged outside the submersible pump (32), and a vacuum pump (34) is connected to the outer end of the vacuum pipe (35).
5. The zonal directional grouting system for freeze-precipitation combination in water-rich areas according to claim 4, wherein the intelligent control system (4) comprises an indoor control center (41), a flow rate sensor (42), a pressure sensor (43), a temperature sensor (44) and an acoustic sensor (45), wherein the flow rate sensor (42), the pressure sensor (43), the temperature sensor (44) and the acoustic sensor (45) are all connected with the indoor control center (41), the flow rate sensor (42) and the pressure sensor (43) are arranged in the precipitation grouting multifunctional sleeve assembly (5), the temperature sensor (44) is arranged at the inner bottom of the freezing pipe outer sleeve (16), and the acoustic sensor (45) is arranged at the inner bottom of the precipitation grouting multifunctional sleeve assembly (5).
6. The regional directional grouting system combining freezing and dewatering in a water-rich region according to claim 5, wherein the dewatering grouting multifunctional sleeve assembly (5) comprises a dewatering grouting outer sleeve (51), the dewatering grouting outer sleeve (51) is arranged in a dewatering grouting dual-purpose hole (6) drilled in a grouting region, a dewatering grouting inner tube (52) is arranged in the dewatering grouting outer sleeve (51), a sand filling layer (53) is arranged between the dewatering grouting outer sleeve (51) and the dewatering grouting inner tube (52), a plurality of through holes (54) are uniformly formed in the lower end of the outer side wall of the dewatering grouting inner tube (52), and a flow rate sensor (42) and a pressure sensor (43) are arranged in the through holes (54).
7. The method for zonal directional grouting of the freezing-precipitation combination of the water-rich area, which is characterized by comprising the following steps of:
s1, performing on-site investigation and test, knowing the soil characteristics, the underground water conditions and a specific area needing grouting, and determining the length of a grouting section, the grouting hole distance and the grouting pressure;
s2, drilling freezing holes (19) on the periphery of a grouting area of a stratum (8) to be reinforced according to design requirements, arranging a freezing system (1), and simultaneously drilling dual-purpose holes (6) for dewatering and grouting in the grouting area according to design rules;
s3, extracting liquid nitrogen from the liquid nitrogen storage tank (11), conveying the liquid nitrogen to the bottom of a freezing pipe branch pipe (15) through a liquid nitrogen pump (12), a liquid supply pipe (13) and a freezing pipe main pipe (14), spraying out from an orifice at the bottom of the freezing pipe branch pipe (15), contacting with soil and quickly evaporating to form a gas state, and returning the gas state nitrogen from a freezing pipe outer sleeve (16) to a collecting pipe (18) and a return pipe (17) to finally convey the gas nitrogen to the liquid nitrogen storage tank (11) to form a closed circulation system, wherein in the process, the liquid nitrogen continuously absorbs heat in the soil to reduce the temperature of the soil and freeze the moisture into ice, and repeating the operation in the step S3 until a freezing wall (7) with enough thickness and strength is formed;
s4, arranging a grouting system (2) and a dewatering system (3) according to the design, arranging a dewatering grouting outer sleeve (51) and a dewatering grouting inner pipe (52) in a dewatering grouting dual-purpose hole (6), and filling gaps between the dewatering grouting outer sleeve (51) and the dewatering grouting inner pipe (52) with sand to form a sand filling layer (53);
s5, pulling out a dewatering grouting outer sleeve (51), connecting a dewatering grouting inner pipe (52) at one of the dewatering grouting dual-purpose holes (6) with the grouting pipe (24), and simultaneously placing a submersible pump (32), a drain pipe (31) and a vacuum pipe (35) in the dewatering grouting inner pipe (52) at the adjacent dewatering grouting dual-purpose hole (6) along the design direction and sealing by using a sealing gasket (36);
s6, grouting slurry is injected into the precipitation grouting inner pipe (52) at the first precipitation grouting dual-purpose hole (6) from the grouting pipe (24), stable flow speed and pressure are ensured, the precipitation grouting inner pipe (52) is gradually pulled out outwards while grouting, meanwhile, water and air in the precipitation grouting inner pipe (52) at the adjacent precipitation grouting dual-purpose hole (6) are pumped out by utilizing the vacuum pump (34) and the vacuum pipe (35), hydraulic gradient and negative pressure are generated, the precipitation grouting inner pipe (52) is kept in situ, slurry is promoted to flow to the adjacent precipitation grouting dual-purpose hole (6), the submersible pump (32) works, and the bottom of the submersible pump (32) is flush with the through hole (54) on the side wall of the precipitation grouting inner pipe (52);
s7, stopping grouting operation at the first precipitation grouting dual-purpose hole (6) when slurry appears in the drain pipe (31), moving the precipitation system (3) to the next precipitation grouting dual-purpose hole (6), and placing the grouting system (2) at the position of the adjacent precipitation grouting dual-purpose hole (6) in the step S6;
s8, repeating the step S4-the step S7, wherein the intelligent control system (4) receives information of each sensor in the process, continuously monitors grouting flow, pressure, dehydration rate and acoustic signals, ensures construction effect and safety, and adjusts the precipitation rate according to requirements so as to control the flowing direction and spreading of slurry;
and S9, stopping grouting and dewatering operation after grouting reaches the required coverage area and density, removing equipment as required and recovering the site.
8. The zonal directional grouting method combining freezing and dewatering in the water-rich area according to claim 7, wherein in the step S2, the freezing hole (19) and the dual-purpose hole (6) for dewatering and grouting are processed by adopting a vertical drilling mode, the freezing hole (19) and the dual-purpose hole (6) for dewatering and grouting are cleaned after drilling, and a sleeve and a water stopper are installed to ensure that no sediment exists in the holes; in step S3, the temperature of the outer sleeve (16) of the freezing pipe is monitored, and the flow and speed of the liquid nitrogen are regulated according to the actual situation, so that the required freezing level is ensured to be reached and maintained.
9. The method of zonal directional grouting in combination with freeze-precipitation in water rich areas according to claim 8, wherein in step S8, grouting pressure and flow rate are monitored to ensure uniform distribution of grouting to avoid over pressurization, the intelligent control system (4) receives the signal of the acoustic sensor (45), evaluates the uniformity, compactness and quality of grouting by analyzing the acoustic signal, monitors the diffusion of grouting material in the underground space, feeds back grouting progress and coverage in real time, finds any void or weak grouting area during monitoring, and performs additional grouting to ensure complete and effective coverage.
10. The method for zoned directional grouting in combination with freeze-precipitation in water-rich areas according to claim 9, wherein after the construction activity of step S9 is completed, the supply of liquid nitrogen is stopped, the ground is naturally thawed or the thawing is accelerated by using warm water and steam, and the thawing process is monitored to ensure stability and manage potential water gushes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410199212.0A CN117779742B (en) | 2024-02-23 | 2024-02-23 | Regional directional grouting system and method combining freezing and dewatering in water-rich region |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410199212.0A CN117779742B (en) | 2024-02-23 | 2024-02-23 | Regional directional grouting system and method combining freezing and dewatering in water-rich region |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN117779742A true CN117779742A (en) | 2024-03-29 |
| CN117779742B CN117779742B (en) | 2024-05-17 |
Family
ID=90394729
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410199212.0A Active CN117779742B (en) | 2024-02-23 | 2024-02-23 | Regional directional grouting system and method combining freezing and dewatering in water-rich region |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117779742B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103527214A (en) * | 2013-11-04 | 2014-01-22 | 南京林业大学 | Horizontal freezing and pipe shed combined subway shield tunnel reinforcing tip and method |
| CN104963334A (en) * | 2015-07-13 | 2015-10-07 | 南京林业大学 | Construction method for utilizing grouting freezing pipe to reinforce and freeze contact passage to restrain frost heaving and thaw collapsing |
| WO2020244677A1 (en) * | 2019-09-28 | 2020-12-10 | 中铁九局集团有限公司 | Freezing construction method for connecting passage, and freezing system |
| CN114109399A (en) * | 2021-12-01 | 2022-03-01 | 中国铁建大桥工程局集团有限公司 | Freezing construction method for limestone stratum |
| CN114541368A (en) * | 2022-02-15 | 2022-05-27 | 淮北矿业股份有限公司 | Liquid nitrogen difference freezers |
| CN115876975A (en) * | 2022-11-23 | 2023-03-31 | 山东大学 | Liquid nitrogen cooling physical simulation test device and method for high-temperature water-rich tunnel |
-
2024
- 2024-02-23 CN CN202410199212.0A patent/CN117779742B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103527214A (en) * | 2013-11-04 | 2014-01-22 | 南京林业大学 | Horizontal freezing and pipe shed combined subway shield tunnel reinforcing tip and method |
| CN104963334A (en) * | 2015-07-13 | 2015-10-07 | 南京林业大学 | Construction method for utilizing grouting freezing pipe to reinforce and freeze contact passage to restrain frost heaving and thaw collapsing |
| WO2020244677A1 (en) * | 2019-09-28 | 2020-12-10 | 中铁九局集团有限公司 | Freezing construction method for connecting passage, and freezing system |
| CN114109399A (en) * | 2021-12-01 | 2022-03-01 | 中国铁建大桥工程局集团有限公司 | Freezing construction method for limestone stratum |
| CN114541368A (en) * | 2022-02-15 | 2022-05-27 | 淮北矿业股份有限公司 | Liquid nitrogen difference freezers |
| CN115876975A (en) * | 2022-11-23 | 2023-03-31 | 山东大学 | Liquid nitrogen cooling physical simulation test device and method for high-temperature water-rich tunnel |
Also Published As
| Publication number | Publication date |
|---|---|
| CN117779742B (en) | 2024-05-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108035335B (en) | Method for constructing shaft type underground parking garage by freezing method | |
| CN105821830B (en) | A kind of anatonosis siphon drainge system for hypotonicity slight slope | |
| CN103015402B (en) | Construction method for inhibiting frost heaving and thaw collapse of horizontally frozen end through cement-soil reinforcement method | |
| CN104963334A (en) | Construction method for utilizing grouting freezing pipe to reinforce and freeze contact passage to restrain frost heaving and thaw collapsing | |
| CN104806253A (en) | Construction method for opening hole between rectangular pipe jacking channels | |
| CN108825247B (en) | External inclination side wall horizontal bottom-making basin-shaped freezing water stop construction method for 8 pilot tunnel PBA construction method | |
| CN104389559A (en) | Method and device for preventing and controlling gas transfinite in thick-coal-seam mining process | |
| CN110374125A (en) | Metro Deep Excavation side wall interlayer method for treating water | |
| CN113202480B (en) | Combined bearing double-layer well wall and construction method thereof | |
| CN108867673A (en) | A kind of underwater prevention method in the foundation pit based on the curtain that draws water | |
| KR100538316B1 (en) | The apparatus and method of earth grouting using compressed air system for intermittent vibrated wave production | |
| CN115308022A (en) | Subway connection channel freezes analogue test system | |
| CN117779742B (en) | Regional directional grouting system and method combining freezing and dewatering in water-rich region | |
| CN111411639B (en) | Shallow foundation pit dewatering construction method for water-rich pebble layer | |
| CN111734416A (en) | Construction method for deep water-rich rock shaft by common freezing method | |
| CN109557128B (en) | Simulation test box for freezing construction | |
| CN109139057B (en) | Coal mining roadway floor water absorption bottom heave treatment method | |
| CN108643926B (en) | Freezing water stop construction method for pilot tunnel of section tunnel | |
| CN215169989U (en) | Freezing system for reinforcing 60-meter-grade ultra-long distance communication channel by freezing method | |
| CN114233374A (en) | Ground grouting construction method for reinforcing collapsed cavity area of inclined shaft after mud burst and water burst | |
| CN111910665A (en) | Precipitation treatment method for steeply inclined strip-shaped interbedded composite stratum foundation pit | |
| CN115306399A (en) | Freezing construction method and apparatus for building structures in a formation | |
| CN109944596A (en) | A kind of shield crossing water-rich sand layer second consolidation method near a river | |
| CN219220417U (en) | Tunnel structure suitable for soft stratum condition | |
| CN116024999B (en) | Strong water-rich loose layer coal mine inclined shaft water-gushing curtain water interception treatment method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |