CN114606927B - Construction method for performing foundation treatment by combining vacuum precipitation and air pressure splitting - Google Patents
Construction method for performing foundation treatment by combining vacuum precipitation and air pressure splitting Download PDFInfo
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- CN114606927B CN114606927B CN202210079315.4A CN202210079315A CN114606927B CN 114606927 B CN114606927 B CN 114606927B CN 202210079315 A CN202210079315 A CN 202210079315A CN 114606927 B CN114606927 B CN 114606927B
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- 238000010276 construction Methods 0.000 title claims abstract description 31
- 238000001556 precipitation Methods 0.000 title claims description 8
- 239000002689 soil Substances 0.000 claims abstract description 28
- 238000005086 pumping Methods 0.000 claims abstract description 22
- 238000002347 injection Methods 0.000 claims description 63
- 239000007924 injection Substances 0.000 claims description 63
- 238000007789 sealing Methods 0.000 claims description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 28
- 239000000463 material Substances 0.000 claims description 15
- 239000011148 porous material Substances 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000004576 sand Substances 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 16
- 238000007596 consolidation process Methods 0.000 abstract description 7
- 230000002829 reductive effect Effects 0.000 abstract description 6
- 230000035699 permeability Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 description 5
- 239000004927 clay Substances 0.000 description 4
- 239000004033 plastic Substances 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000004035 construction material Substances 0.000 description 2
- 230000000670 limiting effect Effects 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
Abstract
The invention discloses a construction method for carrying out foundation treatment by combining vacuum dewatering with air pressure splitting, which is provided with a reusable well hole and a well pipe structure, wherein the structures of a vacuum dewatering well and an air pressure splitting well are identical, the vacuum dewatering well and the air pressure splitting well can be conveniently converted and alternately used, the subsequent engineering construction cannot be influenced, the vacuum loading is realized by pumping vacuum through a high-pressure dewatering well, the preloading procedure can be reduced, the permeability coefficient is improved by splitting a stratum through the air pressure splitting well, the drainage work efficiency of the dewatering well is improved, the drainage consolidation rate of a soft soil stratum can be remarkably improved by combining the vacuum dewatering well with the air pressure splitting well, the construction work amount is small, the loading efficiency is greatly improved, the construction period is shortened, and the construction method has extremely high popularization and use values.
Description
Technical Field
The invention relates to the technical field of foundation treatment construction. More particularly, the invention relates to a construction method for performing foundation treatment by combining vacuum precipitation and air pressure splitting.
Background
In China, a drainage consolidation method is widely adopted for soft foundation treatment aiming at a large range of soft clay; the preloading technique is simple, but the construction procedures are more, a large amount of preloading soil is needed, the construction material organization difficulty is high, and the defects of high control difficulty and long static load period are overcome. The loading path of the vacuum preloading method cannot cause soil shear damage, but the vacuum degree limits the load size, and the vacuum degree is attenuated to limit the treatment depth; the vacuum combined preloading combines the advantages of the two methods well, but still has the characteristics of high construction material consumption and high control difficulty. The soft clay has small permeability coefficient, and the drainage consolidation method has long period and low efficiency, so that the construction method for quickly draining, consolidating and reinforcing the soft clay foundation is urgently needed.
In the technical scheme protected by the Chinese patent with the patent number of CN200510038644.0 and the patent name of the operation method for reinforcing the soft soil foundation by the pneumatic splitting vacuum preloading method, an air duct is arranged in an air guide plastic drainage plate, a high-pressure air conveying device or a vacuumizing device is connected, the pneumatic splitting is carried out on soft soil in the process of conveying high-pressure air, and water and air in the soft soil are discharged by connecting the vacuumizing device.
Disclosure of Invention
It is an object of the present invention to solve at least the above problems and to provide at least the advantages to be described later.
The invention also aims to provide a construction method for treating the foundation by combining vacuum precipitation with air pressure splitting, so as to solve the technical problems of low construction efficiency and poor reinforcement effect in the prior art for the drainage consolidation of the soft soil foundation.
In order to achieve these objects and other advantages and in accordance with the purpose of the invention, there is provided a construction method for performing foundation treatment by combining vacuum dewatering with pneumatic fracturing, wherein vacuum dewatering wells and pneumatic fracturing wells are arranged at intervals on a soft soil layer, the vacuum dewatering wells and the pneumatic fracturing wells have the same structure and are vertically provided with well pipes respectively, the upper ends of the well pipes are steel pipes, the lower ends of the well pipes are filter pipes, filter materials are backfilled between the outer sides of the filter pipes and corresponding well walls, during the foundation treatment, water pumping and vacuumizing treatment are performed in the vacuum dewatering wells, gas injection fracturing treatment is performed on a specific depth area of the pneumatic fracturing well in the filter pipe section, after the treatment, the pneumatic fracturing well is selected to be converted into the vacuum dewatering well, water pumping and vacuumizing treatment are performed, and other vacuum dewatering wells are selected to be converted into the pneumatic fracturing well, so that the circulation is repeated until the foundation treatment is completed.
Preferably, when the vacuum dewatering well is used for pumping water and vacuumizing, the submersible pump is firstly lowered to the bottom of the corresponding well pipe, a cover plate is arranged at the top end of the corresponding well pipe in a sealing mode, a vacuum pipe hole, a water pumping pipe hole and a cable pipe hole are reserved on the cover plate, a cable of the submersible pump is connected to the power supply box through the cable pipe hole, the submersible pump is connected with the water pumping pipe and is connected to the water collecting tank from the water pumping pipe hole, the vacuum pipe penetrates into the middle of the vacuum dewatering well downwards from the vacuum pipe hole, the bottom of the vacuum pipe is higher than the top end of the submersible pump, and a vacuum gauge for measuring the vacuum degree is arranged on the vacuum pipe.
Preferably, when the gas injection splitting treatment is carried out as a gas pressure splitting well, a high-pressure gas injection pipe is arranged in the corresponding well pipe, a hole is formed in the pipe wall of the high-pressure gas injection pipe in a range corresponding to the gas injection splitting depth, sealing components are arranged on the upper side and the lower side of the hole section, so that the space between the upper side and the lower side of the hole section and the inner side wall of the filter pipe corresponding to the required gas injection splitting position is sealed, a gas injection section is formed, gas is injected into the high-pressure gas injection pipe, high-pressure gas enters the gas injection section, and then is sprayed out of the well pipe through the filter pipe, and splitting is carried out on a soft soil layer with a corresponding depth.
Preferably, the sealing assembly comprises an air bag, the air bag is fixed on the periphery of the corresponding position of the high-pressure air injection pipe in a surrounding mode and is communicated with the inside of the high-pressure air injection pipe, an annular rubber sealing ring is sleeved on the periphery of the air bag, an upper disc is connected with the top of the rubber sealing ring in a covering mode, a lower disc is connected with the bottom of the rubber sealing ring and the bottom of the air bag in a covering mode, the upper disc and the lower disc are respectively sleeved and fixed on the outer side wall of the high-pressure air injection pipe, when high-pressure air is injected, the air bag expands, the rubber sealing ring is pushed to deform in a circumferential mode, the inner side wall of the filter pipe is in tight contact with the inner side wall of the filter pipe in a seamless mode, and when air injection is stopped, the air bag and the rubber sealing ring shrink.
Preferably, the holes on the open-pore section are arranged as quincuncial holes.
Preferably, before the foundation treatment, the vacuum dewatering well and the pneumatic fracturing well are arranged in a quincuncial shape in a horizontal plane.
Preferably, the spacing distance between the adjacent vacuum dewatering well and the air fracturing well in the horizontal plane is not less than 15m.
Preferably, the filter material is medium coarse sand, and the pores at the filter material are larger than the pores in the soft soil layer.
The invention at least comprises the following beneficial effects: the construction method for carrying out foundation treatment by combining vacuum dewatering with air pressure splitting is provided with the repeatedly-usable well hole and well pipe structure, the structures of the vacuum dewatering well and the air pressure splitting well are identical, the vacuum dewatering well and the air pressure splitting well can be conveniently switched and alternately used, the subsequent engineering construction is not influenced, the vacuum loading is realized by pumping vacuum through the high-pressure dewatering well, the preloading procedure can be reduced, the permeability coefficient is improved by splitting the stratum through the air pressure splitting well, the drainage work efficiency of the dewatering well is improved, the drainage consolidation rate of a soft soil stratum can be remarkably improved by combining the two structures, the construction engineering quantity is small, the loading efficiency is greatly improved, the construction period is shortened, and the construction method has extremely high popularization and use values.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a front view block diagram of a vacuum dewatering well and an air pressure splitting well arranged in the invention;
Fig. 2 is a front view of a seal assembly of the present invention.
Description of the specification reference numerals: 1. the vacuum dewatering well, 2, the atmospheric pressure splitting well, 3, seal assembly, 4, soft soil layer, 11, immersible pump, 12, vacuum pump, 13, catch basin, 14, apron, 15, drinking-water pipe, 16, vacuum tube, 21, high-pressure gas injection pump, 22, high-pressure gas injection pipe, 23, plum blossom hole, 31, rubber seal, 32, gasbag, 33, upper disc, 34, lower disc.
Detailed Description
The present invention is described in further detail below with reference to the drawings to enable those skilled in the art to practice the invention by referring to the description.
It should be noted that the experimental methods described in the following embodiments, unless otherwise specified, are all conventional methods, and the reagents and materials, unless otherwise specified, are all commercially available; in the description of the present invention, the terms "transverse", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus are not to be construed as limiting the present invention.
As shown in figure 1, the invention provides a construction method for carrying out foundation treatment by combining vacuum precipitation with air pressure fracturing, wherein vacuum dewatering wells 1 and air pressure fracturing wells 2 are arranged on a soft soil layer 4 at intervals, the vacuum dewatering wells 1 and the air pressure fracturing wells 2 are identical in structure, well pipes are respectively arranged in the vertical direction in the wells, the upper ends of the well pipes are steel pipes, the lower ends of the well pipes are filter pipes, filter materials are backfilled between the outer sides of the filter pipes and corresponding well walls, during foundation treatment, water pumping and vacuumizing treatment are carried out in the vacuum dewatering wells 1, air pressure fracturing treatment is carried out on a specific depth area of the air pressure fracturing wells 2, after the treatment, the air pressure fracturing wells 2 are selected to be converted into the vacuum dewatering wells 1, water pumping and vacuumizing treatment are carried out, and other vacuum dewatering wells 1 are selected to be converted into the air pressure fracturing wells 2, and the air pressure fracturing treatment is carried out, and the construction method is repeated until the foundation treatment is completed.
Specifically, firstly, a well hole of a vacuum dewatering well 1 and an air pressure splitting well 2 is drilled, a well pipe is arranged in the well hole, filter materials are filled outside the filter pipe of the well pipe, fine particles in water are prevented from blocking a filter pipe hole and damaging a water suction pump, clay is backfilled in a certain depth range below the well hole and above the filter materials, then a water suction device and a vacuumizing device are arranged in the vacuum dewatering well 1, the top of the vacuum dewatering well 1 is sealed, a certain range of the upper part of the well pipe and a stratum keep good tightness, only holes through which all necessary pipelines pass are reserved, sealing between the pipelines and the holes is achieved, in addition, a high-pressure air injection device is arranged in the air pressure splitting well 2, when a foundation is processed, the vacuum pumping is carried out on the vacuum dewatering well 1, and after the vacuum degree in the well reaches the requirement, the air injection pressure is selected to split soft soil stratum with a specific depth near the air pressure splitting well 2 according to monitoring data as required, the stratum is split, the air pressure splitting well 2 can be converted into the vacuum dewatering well 1 after the permeability coefficient meets the requirement, then other vacuum dewatering wells 1 are selected to be converted into the air pressure splitting well 2, the repeated circulation is carried out until the foundation meets the engineering requirement, the prior art adopts a disposable plastic drainage plate, the drainage plate is left in the soil after the foundation is treated, the adverse effect is caused on the subsequent underground engineering construction, the construction method of the invention for carrying out the foundation treatment by combining the vacuum dewatering with the air pressure splitting is provided with a reusable well hole and a well pipe structure, the structures of the vacuum dewatering well 1 and the air pressure splitting well 2 are identical, the conversion can be conveniently carried out, the subsequent engineering construction is not influenced, the negative pressure loading is realized by extracting the vacuum through the high pressure dewatering well, the preloading procedure can be reduced, the permeability coefficient is improved by splitting the air pressure splitting well 2, the drainage efficiency of the dewatering well is improved, the drainage consolidation rate of the soft soil stratum can be remarkably improved by combining the drainage efficiency and the drainage consolidation rate, the construction work amount is small, the loading efficiency is greatly improved, the construction period is shortened, and the method has extremely high popularization and use values.
In another technical scheme, as shown in fig. 1, when the vacuum dewatering well 1 is used for pumping water and vacuumizing, the submersible pump 11 is firstly lowered to the bottom of the corresponding well pipe, the top end of the corresponding well pipe is provided with the cover plate 14 in a sealing manner, a vacuum pipe 16 hole, a water pumping pipe 15 hole and a cable pipe hole are reserved on the cover plate 14, a cable of the submersible pump 11 is connected to the power supply box through the cable pipe hole, the submersible pump 11 is connected with the water pumping pipe 15 and is connected to the water collecting tank 13 from the water pumping pipe 15 hole, the vacuum pipe 16 penetrates downwards from the vacuum pipe 16 hole to the middle of the vacuum dewatering well 1, the bottom of the vacuum pipe 16 is higher than the top end of the submersible pump 11, and a vacuum gauge for measuring the vacuum degree is arranged on the vacuum pipe 16.
When the pipe well is used as the vacuum dewatering well 1, the submerged pump 11 is arranged in the well to pump water and is connected with the vacuum pump 12 and the water collecting tank 13, the vacuum pipe 16 adopts a thin-wall steel pipe or a PVC pipe, the vacuum pipe 16 is provided with a vacuum meter to measure the vacuum degree, and the water level in the well is reduced below the pit position and kept stable after the vacuum pumping.
In another technical scheme, as shown in fig. 1 and 2, when the gas injection splitting treatment is performed as the gas pressure splitting well 2, a high-pressure gas injection pipe 22 is arranged in the corresponding well pipe, holes are formed in the pipe wall of the high-pressure gas injection pipe 22 in the range of the corresponding gas injection splitting depth, sealing assemblies 3 are arranged on the upper side and the lower side of the hole section, so that the space between the upper side and the lower side of the hole section and the inner side wall of the filter pipe corresponding to the required gas injection splitting position is sealed, a gas injection section is formed, gas is injected into the high-pressure gas injection pipe 22, high-pressure gas enters the gas injection section, and then is sprayed out of the well pipe through the filter pipe, and splitting is performed on the soft soil layer 4 with the corresponding depth.
The high-pressure gas injection pipe 22 is arranged in the well pipe, the problem that the gas injection effect is poor due to the fact that the high-pressure gas injection pipe 22 is directly buried in a stratum and the soft soil paste wall is blocked is avoided, the problem that the pipe is easy to damage in the process of burying and pulling out the high-pressure gas injection pipe 22 and difficult to recycle is avoided, in addition, the gas injection pressure can be well diffused by using the perforated filter pipe and the peripheral filter materials, the pressure loss is reduced, the upper side and the lower side of the gas injection section are blocked by the sealing component 3 to form independent gas injection pressurizing spaces, after the air is introduced into the high-pressure gas injection pipe 22 by the head cover high-pressure gas injection pump 21, the air enters the space between the upper sealing component 3 and the lower sealing component 3 through the holes in the high-pressure gas injection pipe 22, and then is sprayed out through the holes of the filter pipes in the corresponding positions to perform gas pressure splitting, and when pipe well conversion is needed, the sealing component 3 is recovered synchronously, the detached structure itself is not affected or changed, and the relevant structural equipment of the vacuum dewatering well 1 is convenient to install. Through changing the range of trompil and the position of two upper and lower seal assembly on high pressure gas injection pipe 22, can carry out atmospheric pressure split to the soft soil layer of required different degree of depth ranges, when gas injection split, only need transfer and use once gas injection pipe, can accomplish splitting work basically and satisfy the soft soil layer reinforcement effect on the engineering requirement, the depth position of gas injection split also can be controlled to the direct control high pressure gas injection pipe's depth of transfer, still can cloth multistage trompil and a plurality of seal assembly and control trompil size etc. on high pressure gas injection pipe, constitute multistage relatively independent gas injection section, in order to adapt to the multiple construction demand of different gas injection split degree of different degree of depth, it is very nimble.
In another technical scheme, as shown in fig. 1 and 2, the sealing assembly 3 includes an air bag 32, the air bag 32 is fixed around the periphery of the corresponding position of the high-pressure air injection pipe 22 and is communicated with the inside of the high-pressure air injection pipe 22, an annular rubber sealing ring 31 is sleeved on the periphery of the air bag 32, an upper disc 33 is covered and connected with the top of the rubber sealing ring 31 and the top of the air bag 32 together, a lower disc 34 is covered and connected with the bottom of the rubber sealing ring 31 and the bottom of the air bag 32 together, the upper disc 33 and the lower disc 34 are respectively sleeved and fixed on the outer side wall of the high-pressure air injection pipe 22, when high-pressure air is injected, the air bag 32 expands, the rubber sealing ring 31 is pushed to deform in a circumferential direction, the inner side wall of the filter pipe is in close contact with no gap, and when air injection is stopped, the air bag 32 and the rubber sealing ring 31 shrink.
When the upper disc 33, the lower disc 34 and the rubber sealing ring 31 are arranged, the outer diameters of the upper disc 33, the lower disc 34 and the rubber sealing ring 31 are slightly smaller than the inner diameter of a pipe well, so that the pipe well can be conveniently and smoothly accessed, the upper disc 33 and the lower disc 34 are used for limiting the air bag 32 and the rubber sealing ring 31, the air bag 32 and the rubber sealing ring 31 are clamped by the upper disc 33 and the lower disc 34, so that the air bag 32 and the rubber sealing ring 31 only deform horizontally when being stressed, the air bag 32 is positioned at the inner side of the rubber sealing ring 31, when high-pressure gas is injected, the air bag 32 expands and extrudes the rubber sealing ring 31 to be contacted with the inner wall of the pipe well, no gap exists between the rubber sealing ring 31 and the inner wall of the pipe well, the air injection is stopped, the air bag 32 and the rubber sealing ring 31 are retracted, the rubber sealing ring 31 is separated from contact with the pipe well, and the high-pressure gas injection pipe 22 can be recovered synchronously.
In another embodiment, as shown in fig. 2, the holes on the open section are arranged as quincuncial holes 23.
The plum blossom holes 23 are arranged on the open hole section, the air flow flows uniformly in all directions, the pores at the filter material positions outside the filter tube are larger than those of soft soil, the pressure transmission of the air pressure splitting is faster than that of the soft soil, and the pressure loss is small.
In another technical scheme, before the foundation treatment, the vacuum dewatering well 1 and the pneumatic fracturing well 2 are arranged in a quincuncial shape in a horizontal plane. The perforated holes arranged in a quincuncial shape in the horizontal plane are arranged in a crossing way, so that the uniformity of the treatment of the soft soil layer 4 is improved.
In another technical scheme, as shown in fig. 1, the spacing distance between the adjacent vacuum dewatering well 1 and the air pressure splitting well 2 in the horizontal plane is not less than 15m.
The disposable plastic drainage plate is adopted in the prior art, the space between the quincuncial arrangement is about 1m, the arrangement is dense, compared with the drainage plate, the space between the pneumatic splitting well 2 and the vacuum dewatering well 1 in the patent is larger, the space and arrangement are redesigned according to stratum and engineering requirements, the space between the common wells can reach more than 15m, the workload of well hole arrangement is greatly reduced, the reinforcement effect of the pneumatic splitting on the foundation can be guaranteed, and the amplitude is improved by 1.2-1.3 times compared with that of the pneumatic splitting method by the traditional vacuum method.
In another technical scheme, as shown in fig. 1 and 2, the filter material is medium coarse sand, and the pores at the filter material are larger than those in the soft soil layer 4. The medium coarse sand is selected to have certain mechanical strength, and the proper particle size is selected so that the pores among the filter materials are larger than the pores inside the soft soil layer 4, thereby reducing the pressure loss of the pneumatic splitting.
Although embodiments of the present invention have been disclosed above, it is not limited to the details and embodiments shown and described, it is well suited to various fields of use for which the invention would be readily apparent to those skilled in the art, and accordingly, the invention is not limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.
Claims (4)
1. The construction method for carrying out foundation treatment by combining vacuum dewatering and air pressure splitting is characterized in that vacuum dewatering wells and air pressure splitting wells are arranged at intervals on a soft soil layer, the vacuum dewatering wells and the air pressure splitting wells are identical in structure, well pipes are vertically arranged in the wells respectively, the upper ends of the well pipes are steel pipes, the lower ends of the well pipes are filter pipes, filter materials are backfilled between the outer sides of the filter pipes and corresponding well walls, during foundation treatment, pumping water and vacuumizing treatment are carried out in the vacuum dewatering wells, air injection splitting treatment is carried out on a specific depth area of the air pressure splitting wells in a filter pipe section, pumping water and vacuumizing treatment are carried out after the air pressure splitting wells, other vacuum dewatering wells are selected to be converted into air pressure splitting wells for air injection splitting treatment, and the repeated circulation is carried out until the foundation treatment is completed;
When the submersible pump is used as a vacuum dewatering well for pumping water and vacuumizing, a cover plate is arranged at the top end of the corresponding well pipe in a sealing way, a vacuum pipe hole, a water pumping pipe hole and a cable pipe hole are reserved on the cover plate, the cable of the submersible pump is connected to a power supply box through the cable pipe hole, the submersible pump is connected with a water pumping pipe and is connected to a water collecting tank from the water pumping pipe hole, a vacuum pipe penetrates into the middle part of the vacuum dewatering well from the vacuum pipe hole downwards, the bottom of the vacuum pipe is higher than the top end of the submersible pump, and a vacuum gauge for measuring the vacuum degree is arranged on the vacuum pipe;
when the gas injection splitting treatment is carried out as a gas pressure splitting well, a high-pressure gas injection pipe is arranged in the corresponding well pipe, a hole is formed in the pipe wall of the high-pressure gas injection pipe in a range corresponding to the gas injection splitting depth, sealing components are arranged on the upper side and the lower side of the hole section, so that the space between the upper side and the lower side of the hole section and the inner side wall of the filter pipe corresponding to the gas injection splitting position is sealed, a gas injection section is formed, gas is injected into the high-pressure gas injection pipe, the high-pressure gas enters the gas injection section, and then is sprayed out of the well pipe through the filter pipe, and splitting is carried out on a soft soil layer with the corresponding depth;
before the foundation treatment, the vacuum dewatering well and the pneumatic splitting well are arranged in a quincuncial shape in a horizontal plane;
and the spacing distance between the adjacent vacuum dewatering well and the air pressure splitting well in the horizontal plane is not less than 15m.
2. The construction method for carrying out foundation treatment by combining vacuum precipitation with air pressure splitting according to claim 1, wherein the sealing assembly comprises an air bag, the air bag is fixed on the periphery of the corresponding position of the high-pressure air injection pipe in a surrounding mode and is communicated with the inside of the high-pressure air injection pipe, an annular rubber sealing ring is sleeved on the periphery of the air bag, an upper disc is jointly covered and connected with the top of the rubber sealing ring and the top of the air bag, a lower disc is jointly covered and connected with the bottom of the rubber sealing ring and the bottom of the air bag, the upper disc and the lower disc are respectively sleeved and fixed on the outer side wall of the high-pressure air injection pipe, and when high-pressure air is injected, the air bag is inflated, the rubber sealing ring is pushed to deform in a circumferential mode, no gap is formed between the air bag and the rubber sealing ring is contracted when air injection is stopped.
3. The construction method for performing foundation treatment by combining vacuum precipitation with air pressure splitting according to claim 1, wherein the hole sites on the open hole section are arranged as quincuncial holes.
4. The construction method for performing foundation treatment by combining vacuum precipitation with air pressure splitting according to claim 1, wherein the filter material is medium coarse sand, and the pores at the filter material are larger than the pores inside the soft soil layer.
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