CN110847150A - Soft soil foundation treatment device and method - Google Patents
Soft soil foundation treatment device and method Download PDFInfo
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- CN110847150A CN110847150A CN201911252918.4A CN201911252918A CN110847150A CN 110847150 A CN110847150 A CN 110847150A CN 201911252918 A CN201911252918 A CN 201911252918A CN 110847150 A CN110847150 A CN 110847150A
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- 239000002689 soil Substances 0.000 title claims abstract description 98
- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000004576 sand Substances 0.000 claims abstract description 167
- 238000002347 injection Methods 0.000 claims abstract description 110
- 239000007924 injection Substances 0.000 claims abstract description 110
- 239000000463 material Substances 0.000 claims abstract description 55
- 239000012530 fluid Substances 0.000 claims abstract description 38
- 230000009471 action Effects 0.000 claims abstract description 9
- 239000007921 spray Substances 0.000 claims abstract description 8
- 239000007788 liquid Substances 0.000 claims description 39
- 238000005507 spraying Methods 0.000 claims description 26
- 230000008569 process Effects 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 7
- 230000035699 permeability Effects 0.000 abstract description 3
- 238000007789 sealing Methods 0.000 description 10
- 238000010276 construction Methods 0.000 description 8
- 239000000443 aerosol Substances 0.000 description 7
- 238000005553 drilling Methods 0.000 description 7
- 238000007596 consolidation process Methods 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 230000006872 improvement Effects 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 238000005243 fluidization Methods 0.000 description 1
- 239000008263 liquid aerosol Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000008275 solid aerosol Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- 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
-
- 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
- E02D3/106—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains by forming sand drains containing only loose aggregates
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/18—Drilling by liquid or gas jets, with or without entrained pellets
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Environmental & Geological Engineering (AREA)
- Structural Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Soil Sciences (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Agronomy & Crop Science (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention relates to a soft soil foundation treatment device and a method, comprising the following steps: the gas-sand mixing and conveying device comprises a mixing chamber and a gas generating device, wherein the mixing chamber is used for fluidizing sand materials to form gas-sand mixed fluid; the air-sand injection device comprises a drill rod component which is used for being downwards inserted into a soft soil layer, the drill rod component is communicated with a material conveying pipe, and a first injection hole for outwards injecting air-sand mixed fluid is formed in the drill rod component; and the power device is used for driving the drill rod assembly to move up and down and driving the drill rod assembly to rotate around the axis of the drill rod assembly. The soft soil foundation treatment device can spray the gas-sand mixed fluid in a soft soil layer to form a horizontal drainage sand layer with good water permeability, the horizontal drainage sand layer paved under the action of air has certain strength and thickness, deformation is not easy to occur to block a drainage channel, uneven settlement of soft soil can be coordinated, additional stress in a soil body is increased due to the existence of the horizontal drainage sand layer, and drainage uniformity and drainage efficiency are improved.
Description
Technical Field
The invention relates to the technical field of soft soil foundation treatment, in particular to a soft soil foundation treatment device and method.
Background
With the demand of social development, more and more soft soil is used as a building foundation. When soft soil is used as a foundation or other purposes, reinforcement treatment needs to be carried out on the soft soil, and because the soft soil has the properties of high water content, high pore ratio, high flow plasticity and the like, the drainage consolidation method is a common foundation treatment method aiming at the projects at present, and the drainage consolidation method is a principle that the vertical drainage bodies such as sand wells or plastic drainage plates are arranged, so that pore water in soil layers is mainly drained from the horizontal direction through the vertical drainage bodies, thereby increasing the drainage way of the soil layers, shortening the drainage distance, accelerating the drainage consolidation of the soil bodies under the load action, leading the soil bodies to generate larger settlement in a short time, further achieving the purposes of improving the strength of the soil bodies and reducing the post-construction settlement, but in the traditional foundation treatment method, only the drainage plates are arranged as the vertical drainage bodies, the sand cushion layers above are taken as the horizontal drainage bodies, and no horizontal drainage channel is added in the underground, thereby having low drainage efficiency, it has the limitations of long construction period, high construction cost and complex construction operation.
In order to increase no horizontal drainage channel in underground soft soil, further accelerate the drainage speed of the foundation and improve the treatment efficiency of the foundation, the application number is CN201611224965.4 (No. CN106677156B), and discloses a method for disturbing the soft soil foundation by aerosol, wherein after a drainage body, a cushion layer, a drainage ditch, a protective cylinder or a punching channel is arranged, an injection pipe penetrates through the protective cylinder or the punching channel, liquid or solid aerosol raw materials in an aerosol generator are atomized to form aerosol, the aerosol is injected into the soil body under high pressure, and the injected aerosol forms a horizontal cutting surface with a tiny thickness in the soil body, so that a horizontal drainage channel is formed, the drainage distance is shortened, and the effect of rapid drainage is achieved.
Firstly, the horizontal drainage channel formed in the soft soil by the aerosol injection is only a temporary drainage layer, and the contacted sludge is modified mainly by a certain amount of inorganic high-cation material and corresponding amphiphilic high polymer material added in the horizontal drainage channel to form a micro-surface drainage system, wherein the horizontal drainage channel of the micro-surface drainage system has small thickness, and the horizontal drainage channel is easy to block due to uneven settlement of a local area of the soft soil layer, so that the drainage in a certain horizontal range is uneven, and the overall drainage efficiency is influenced; secondly, soft soil foundation treatment mode still needs the interval to set up more vertical drainage body, has caused the waste of resource, and the aerosol cost that adds functional material in addition is also higher relatively, and this has increased the cost that soft soil foundation handled. Therefore, the technical problem to be solved by those skilled in the art is how to provide a foundation treatment method capable of forming a stable horizontal drainage layer in soft soil and further ensuring drainage efficiency.
Disclosure of Invention
The first technical problem to be solved by the present invention is to provide a soft soil foundation treatment device capable of forming a stable horizontal drainage layer in soft soil and further ensuring drainage efficiency, in view of the current state of the prior art.
The second technical problem to be solved by the present invention is to provide a soft soil foundation treatment method capable of forming a stable horizontal drainage layer in soft soil to ensure drainage efficiency, in view of the current situation of the prior art.
The technical scheme adopted by the invention for solving the first technical problem is as follows: a soft soil foundation treatment device comprising:
the gas-sand mixing and conveying device comprises a mixing chamber and a gas generating device, wherein the mixing chamber is used for fluidizing sand materials to form gas-sand mixed fluid, the gas generating device is used for providing gas power for the mixing chamber, the mixing chamber is provided with a sand material inlet, an air inlet and a discharge hole, the gas generating device is connected with the air inlet of the mixing chamber, and the discharge hole is connected with a conveying pipe used for conveying the gas-sand mixed fluid;
the air-sand spraying device comprises a drill rod assembly which is used for being downwards inserted into a soft soil layer, the drill rod assembly is communicated with the material conveying pipe, and a first spraying hole for outwards spraying air-sand mixed fluid is formed in the drill rod assembly;
and the power device is used for driving the drill rod assembly to move up and down and driving the drill rod assembly to rotate around the axis of the drill rod assembly.
In order to stably spray the gas-sand mixed fluid to one side to form a horizontal drainage layer, the drill rod assembly comprises a hollow drill rod and a material guide pipe arranged in the hollow drill rod, the upper end of the material guide pipe is communicated with the material guide pipe, the side wall of the lower part of the material guide pipe is also connected with an injection pipe extending to the outer wall of the hollow drill rod, and a port of the injection pipe forms the first injection hole.
In order to further increase the laying range of the horizontal drainage layer, the spray pipe is a telescopic pipe which can extend outwards along the radial direction of the hollow drill rod, and the telescopic pipe can retract inwards to be accommodated in a cavity formed between the hollow drill rod and the material guide pipe. When the hollow drill rod drills downwards or lifts upwards, the injection pipe can be contained in a cavity formed between the hollow drill rod and the material guide pipe, and interference caused by up-and-down movement of the hollow drill rod is avoided.
As an improvement, the injection pipe is one of a one-stage telescopic pipe, a two-stage telescopic pipe or a multi-stage telescopic pipe. The injection pipe can be designed into a one-stage telescopic pipe, a two-stage telescopic pipe or a multi-stage telescopic pipe according to actual operation requirements.
In order to ensure that the extension tube can stably extend and retract, the injection tube is a two-stage extension tube and comprises a first tube, a second tube and a third tube which are sequentially connected along the length direction, the first pipe fitting is connected between the hollow drill rod and the material guide pipe, a first annular groove liquid cavity which is coaxial with the first pipe fitting is arranged on the wall of the first pipe fitting, the first annular groove liquid cavity is communicated with an external hydraulic pipeline, the second pipe fitting is movably arranged in the first annular groove liquid cavity along the axial direction and can extend outwards under the action of hydraulic pressure, a second annular groove liquid cavity which is coaxial with the second pipe fitting is arranged on the wall of the second pipe fitting, the second annular groove liquid cavity is communicated with the first annular groove liquid cavity, the third pipe fitting is movably arranged in the second annular groove liquid cavity along the axial direction and can extend outwards under the action of hydraulic pressure, and the first injection hole is positioned at the outer end part of the third pipe fitting. When the injection pipe needs to extend out of the hollow drill rod, liquid can be injected into the first annular groove liquid cavity and the second annular groove liquid cavity through the corresponding hydraulic control systems, and the third pipe fitting and the second pipe fitting are driven to extend out relative to the first pipe fitting; when the injection pipe needs to be retracted into the hollow drill rod, through the corresponding hydraulic control system, the liquid in the first annular groove liquid cavity and the second annular groove liquid cavity is decompressed and flows back, and the second pipe fitting and the third pipe fitting are driven to retract inwards relative to the first pipe fitting. The hydraulic medium of the hydraulic control system can be water or oil liquid, and oil liquid is preferably adopted for sealing, lubricating and avoiding pipe fitting rusting; if the hydraulic system is made of stainless steel material, water is preferably used.
In order to improve the laying speed of the horizontal drainage layer, the spraying pipes are correspondingly provided with a plurality of groups along the length direction of the material guide pipes, each group of spraying pipes comprises three spraying pipes, and the three spraying pipes are uniformly arranged at intervals along the circumferential direction of the material guide pipes.
In order to form a vertical drainage sand well which is connected with the horizontal drainage sand layer in the upward lifting process of the drill rod assembly, the lower end of the guide pipe is connected to the bottom of the hollow drill rod, a second injection hole for injecting the air-sand mixed fluid downwards is formed in the lower end of the guide pipe, a second valve of the second injection hole capable of being closed or opened is arranged on the second injection hole, and a first valve of the first injection hole capable of being closed or opened is also arranged on the first injection hole. The drill rod component can form a horizontal drainage sand layer and a vertical drainage sand well at one time in the process of drilling a soft soil layer once, so that the speed of foundation treatment is effectively increased, additional laying of other vertical drainage bodies is avoided, and the cost is saved.
As an improvement, the gas generating device is an air compressor.
The technical scheme adopted by the invention for solving the second technical problem is as follows: the soft soil foundation treatment method comprises the following steps:
step 1, paving a cushion layer, namely paving the cushion layer on the surface of a soft soil foundation to be treated;
step 3, spraying to form a horizontal drainage sand layer, adding sand into the mixing chamber through a sand inlet, starting the gas generating device to input gas into the mixing chamber, fully mixing gas and sand in the mixing chamber to form gas-sand mixed fluid, then conveying the gas-sand mixed fluid into the drill rod assembly through the conveying pipe, and simultaneously driving the drill rod assembly to rotate through the power device to spray the gas-sand mixed fluid to the side part through a first spraying hole of the drill rod assembly to form the horizontal drainage sand layer;
step 4, forming a vertical drainage sand well by injection, lifting the drill rod assembly through a power device after the injection of the horizontal drainage sand layer is finished, and simultaneously opening a second injection hole correspondingly arranged at the lower end part of the drill rod assembly to enable the gas-sand mixed fluid to be downwards sprayed out through the second injection hole so as to form the vertical drainage sand well which is jointed with the horizontal drainage sand layer in the upward lifting process of the drill rod assembly;
and 5, constructing a vertical and horizontal three-dimensional drainage network, and sequentially repeating the steps 2-4 at the rest set positions to form a stable vertical and horizontal three-dimensional drainage network, wherein horizontal drainage sand layers formed by spraying at the adjacent set positions are continuously jointed in the horizontal direction.
As an improvement, the drill rod assembly comprises a hollow drill rod and a material guide pipe arranged in the hollow drill rod, the upper end of the material guide pipe is communicated with the material guide pipe, the side wall of the lower part of the material guide pipe is also connected with an injection pipe extending to the outer wall of the hollow drill rod, the port of the injection pipe forms the first injection hole, and the injection pipe is a telescopic pipe which can extend outwards along the radial direction of the hollow drill rod and can retract inwards to be accommodated in a cavity between the hollow drill rod and the material guide pipe;
in step 3, combining the diameter of the vertical pipe body, the material performance and the multistage performance of the extension pipe, the injection pipe can extend outwards by 0.2-1.0m, preferably 0.3-0.6m, and of course, a longer extension pipe can be selected according to actual needs; the method comprises the steps of firstly, after the injection pipe extends outwards, laying a first annular horizontal drainage sand layer on the periphery, then, after the injection pipe retracts inwards in sequence to a set distance, continuously injecting to form a second annular horizontal drainage sand layer, sequentially and circularly repeating, continuously combining two adjacent annular horizontal drainage sand layers, and finally laying to form a circular horizontal drainage sand layer.
Compared with the prior art, the invention has the advantages that: the soft soil foundation treatment device of the invention comprises: firstly, the soft soil foundation treatment device can fully mix gas and sand to form gas-sand mixed fluid, and then the gas-sand mixed fluid is sprayed in a soft soil layer through a drill rod component of a gas-sand spraying device to form a horizontal drainage sand layer with good water permeability; secondly, the horizontal drainage sand layer paved and formed under the action of air force has certain strength and thickness, namely soft ribs are added in the soft soil, so that the drainage channel is not easy to deform to block, even if the soft soil is subjected to a small amount of differential settlement, the differential settlement of the soft soil can be coordinated due to the flexible deformability of the sand layer, and the drainage uniformity and the drainage efficiency are improved; due to the existence of the horizontal sand layer, the additional stress in the soil body is increased, namely the stacking load is increased in the soft soil, the drainage of the soft soil is accelerated, and the filling of the horizontal drainage sand layer can reduce the ground surface settlement amount in the construction period; and finally, the horizontal sand layer cuts the radial thickness of the soft soil and forms a vertical sand well with the drill rod body to form a three-dimensional drainage network, so that the drainage and consolidation time of the soft soil is greatly shortened, the strength of a consolidated soil body formed by the soft soil after drainage is finished is higher, and the problem of post-construction settlement is avoided.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a schematic structural view of an embodiment of the present invention (the injection pipe is in a state of extending out of the hollow drill rod);
FIG. 3 is a schematic view of an embodiment of the present invention (drill rod assembly in an up-lift configuration);
FIG. 4 is a schematic structural diagram of a soft soil foundation after a horizontal drainage sand layer and a vertical drainage sand well are paved;
fig. 5 is a schematic structural view (top view angle) after a horizontal drainage sand layer and a vertical drainage sand well are laid on a soft soil foundation according to an embodiment of the invention;
FIG. 6 is a schematic view of a horizontal drainage sand layer laid in accordance with an embodiment of the present invention;
FIG. 7 is a schematic structural view of a drill rod assembly according to an embodiment of the present invention;
FIG. 8 is a schematic view of the construction of a drill stem assembly according to an embodiment of the present invention (with the ejector tube in an extended state);
FIG. 9 is a schematic perspective view (in a contracted state) of an injection tube according to an embodiment of the present invention;
FIG. 10 is a schematic perspective view (in an extended state) of a one-stage telescopic pipe as an injection pipe according to an embodiment of the present invention;
FIG. 11 is a schematic perspective view (in an extended state) of a two-stage telescopic pipe as an injection pipe according to an embodiment of the present invention;
FIG. 12 is an axial cross-sectional view (in a contracted state) of a two-stage telescopic tube of the injection tube of the embodiment of the present invention;
FIG. 13 is an axial cross-sectional view (in an extended state) of a two-stage telescopic tube of the spray tube of the embodiment of the present invention;
FIG. 14 is an enlarged view taken at A in FIG. 12;
FIG. 15 is an enlarged view taken at A in FIG. 13;
fig. 16 is an enlarged view at B in fig. 13.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
Referring to fig. 1 to 16, the soft soil foundation treatment device comprises a gas-sand mixing and conveying device, a gas-sand injection device and a power device, wherein the gas-sand mixing and conveying device is used for fully fluidizing sand materials to form gas-sand mixed fluid, then the gas-sand mixed fluid is sent into the gas-sand injection device inserted into a soft soil layer, and the gas-sand injection device is used for injecting the gas-sand mixed fluid into the soft soil layer to form a horizontal drainage sand layer 52.
Referring to fig. 1-3, the gas-sand mixing and conveying device includes a gas generating device and a mixing chamber 10, the mixing chamber 10 includes a sand inlet, an air inlet and a discharge port, wherein the sand inlet is disposed at an upper portion of the mixing chamber 10, a feeding device 14 for containing sand is connected to the sand inlet of the mixing chamber 10, the sand can be fed into the mixing chamber 10 from the sand inlet, and a control valve 13 for controlling a flow rate of the sand is further disposed at the sand inlet. The air inlet is located at the lower position of the mixing chamber 10, the air generating device in this embodiment is an air compressor 12, the air compressor 12 is connected to the air inlet of the mixing chamber 10, further, a corresponding fluidization plate (not shown) can be arranged in the mixing chamber 10, so that sand can be fully fluidized after entering the mixing chamber 10 to form air-sand mixed fluid, the discharge port of the mixing chamber 10 is connected to a material conveying pipe 11, and the air-sand mixed fluid can be conveyed to the air-sand injection device through the material conveying pipe 11. The air-sand mixing and conveying device in this embodiment can adopt a pneumatic conveying system for fully mixing air and solid and then carrying out pneumatic conveying in the prior art, and the structure and the working process of the pneumatic conveying system are known technologies, which are not described herein, for example, the application number CN201310461111.8 (publication number CN104512728A) discloses "a pneumatic conveying air-solid mixing chamber for flour".
Referring to fig. 1 to 7, the air-sand injection device includes a drill rod assembly 20 inserted downward into a soft soil layer, specifically, the drill rod assembly 20 includes a hollow drill rod 21 and a material guide tube 22 in the hollow drill rod 21, the material guide tube 22 and the hollow drill rod 21 are coaxially disposed, wherein a lower end of the material guide tube 22 is connected to a lower end of the hollow drill rod 21, an upper end of the material guide tube 22 is connected to an upper end of the hollow drill rod 21, and both form a whole and can rotate together under the driving of the power device.
With continued reference to fig. 1-7, the upper end of the guide tube 22 of the drill rod assembly 20 is connected to the feed delivery tube 11, and the injection tube 40 is connected to the side wall of the lower portion of the guide tube 22, specifically, the injection tube 40 extends from the side wall of the feed delivery tube 22 to the outer wall of the hollow drill rod 21 along the radial direction of the feed delivery tube 22, that is, the first end (inner end) of the injection pipe 40 is connected to the side wall of the material guiding pipe 22 and communicated with the material guiding pipe 22, the second end of the injection pipe 40 is connected to the wall of the hollow drill rod 21, the port of the second end of the injection pipe 40 forms a first injection hole 31, and the gas-sand mixed fluid can be injected into soft soil through the first injection hole 31 to form a horizontal drainage sand layer 52, in this embodiment, the diameter of the first injection holes 31 is 0.2-20cm, preferably 2-5cm, of course, the diameter of the extension tube may be increased as necessary, thereby increasing the diameter of the injection hole 31.
Referring to fig. 7, in order to increase the laying speed of the horizontal drainage sand layer 52, a plurality of groups of injection pipes 40 are correspondingly arranged along the length direction of the material guiding pipe 22, the height distance between two adjacent groups of injection pipes 40 is 20-200cm, preferably 30-80cm, and the height distance can be adjusted according to the requirements of the thickness of soft soil and the diameter of the injection hole 31. Each set of the injection tubes in this embodiment includes three injection tubes 40, and the three injection tubes 40 are uniformly spaced apart in the circumferential direction of the guide tube 22. When the horizontal sand draining layer 52 is laid, the drill rod assembly 20 is driven by the power device to rotate 120 degrees, so that the circular horizontal sand draining layer 52 can be laid.
Referring to fig. 3 and 7, the lower end of the guide tube 22 is connected to the bottom of the hollow drill rod 21, the lower end of the guide tube 22 is provided with a second injection hole 32 for injecting the sand-air mixture downward, the diameter of the second injection hole 32 is preferably 1-20cm, preferably 5-10cm, and the diameter of the drill rod 20 may be increased, so as to increase the diameter of the second injection hole 32. The second injection hole 32 is provided with a second shutter 33 for closing or opening the second injection hole 32, and the first injection hole 31 is also provided with a first shutter 34 for closing or opening the first injection hole 31. When the horizontal drainage sand layer 52 is performed, the second shutter 33 may be closed to block the second injection hole 32 at the lower end of the guide pipe 22 and inject the air-sand mixture fluid only through the first injection hole 31, and when the horizontal drainage sand layer 52 is completely laid, the first shutter 34 may be closed to block the first injection hole 31 and inject the air-sand mixture fluid only through the second injection hole 32 downward during the upward lifting of the drill rod assembly 20, thereby forming the vertical drainage sand well 53 coupled with the horizontal drainage sand layer 52. The first valve 34 and the second valve 33 can be opened or closed by electric control in the prior art, and the arrangement of the first valve 34 and the second valve 33 can effectively prevent slurry in a soft soil layer from blocking the first injection hole 31 and the second injection hole 32, thereby playing a role in inclusion. In the process of drilling and drilling soft soil, the drill rod assembly 20 in the embodiment can form the horizontal drainage sand layer 52 and the vertical drainage sand well 53 at one time, so that the speed of foundation treatment is effectively increased, other vertical drainage bodies do not need to be additionally paved, and the cost is saved.
Referring to fig. 7 and 8, the injection pipe 40 in this embodiment is a telescopic pipe that can be extended outward in a radial direction of the hollow drill rod 21 and can be retracted inward to be received in a cavity 200 formed between the hollow drill rod 21 and the guide tube 22. Specifically, when the hollow drill rod 21 is drilled downward or lifted upward, the injection pipe 40 can be accommodated in a cavity formed between the hollow drill rod 21 and the guide tube 22, thereby preventing interference with the upward and downward movement of the hollow drill rod 21.
In order to further increase the laying range of the horizontal drainage layer, the spray pipe 40 in this embodiment may be designed as a one-stage telescopic pipe, a two-stage telescopic pipe or a multi-stage telescopic pipe according to actual operation requirements. The injection pipe 40 shown in fig. 10 is a one-stage telescopic pipe; the injection pipe 40 shown in fig. 11-13 is a two-stage telescopic pipe.
Referring to fig. 11 to 13, the injection pipe 40 of the present embodiment will be described with reference to a two-stage telescopic pipe as an example of the telescopic process of the injection pipe 40. The injection pipe 40 is a two-stage telescopic pipe and comprises a first pipe 41, a second pipe 42 and a third pipe 43 which are sequentially connected along the length direction, the first pipe 41 is connected between the hollow drill rod 21 and the guide pipe 22, a first annular groove liquid cavity 410 which is coaxially arranged with the first pipe 41 is arranged on the wall of the first pipe 41, a first liquid hole 44 which is communicated with the first annular groove liquid cavity 410 is arranged on the wall of the first pipe, the first annular groove liquid cavity 410 is communicated with an external hydraulic pipeline (not shown) through the first liquid hole 44, the second pipe 42 is movably arranged in the first annular groove liquid cavity 410 along the axial direction and can extend outwards under the hydraulic action, a second annular groove liquid cavity 420 which is coaxially arranged with the second pipe 42 is arranged on the wall of the second pipe 42, a second liquid hole 45 is arranged on the end wall of the inner end of the second pipe 42, the second annular groove liquid cavity 420 is communicated with the first annular groove liquid cavity 410 through the second liquid hole 45, the third pipe member 43 is movably disposed in the second annular tank chamber 420 in the axial direction and is capable of being extended outward by hydraulic pressure, and the first injection hole 31 is located at an outer end portion of the third pipe member 43. When the injection pipe 40 needs to extend out of the hollow drill rod 21, liquid can be injected into the first annular groove liquid cavity 410 and the second annular groove liquid cavity 420 through corresponding hydraulic control systems, and the third pipe 43 and the second pipe 42 are driven to sequentially extend outwards relative to the first pipe 41; when it is desired to retract the injection pipe 40 into the hollow drill rod 21, the hydraulic pressure in the first annular groove fluid chamber 410 and the second annular groove fluid chamber 420 is returned through the corresponding hydraulic control system, so as to retract the second pipe 42 and the third pipe 43 inward relative to the first pipe 41.
Referring to fig. 14-16, in order to ensure the stability and the sealing performance when the second pipe 42 and the third pipe 43 move relative to the first pipe 41, a first sealing element 61 is sleeved on the outer wall of the inner end of the second pipe 42, so as to achieve the sealing performance between the wall surface of the first annular groove liquid cavity 410 of the first pipe 41 and the outer wall of the second pipe 42. A second sealing element 62 is embedded on the inner wall of the inner end of the second pipe element 42 to realize the sealing between the wall surface of the first annular liquid cavity 410 of the first pipe element 41 and the inner wall of the second pipe element 42. The outer wall of the inner end of the third pipe 43 is sleeved with a third sealing element 63 to realize the sealing between the wall surface of the second annular groove liquid chamber 420 of the third pipe 43 and the outer wall of the third pipe 43. A fourth sealing member 64 is fitted on the inner wall of the inner end of the third pipe member 43 to achieve sealing between the wall surface of the second annular tank chamber 420 of the third pipe member 43 and the inner wall of the third pipe member 43. Of course, in order to axially limit the second pipe fitting 42 and the third pipe fitting 43, the outer port of the first pipe fitting 41 is provided with a first shoulder 71 for axially limiting the second pipe fitting 42, correspondingly, the outer wall surface of the inner end of the second pipe fitting 42 is provided with a first step portion 73 capable of abutting against the first shoulder 71, the outer port of the second pipe fitting 42 is provided with a second shoulder 72 for axially limiting the third pipe fitting 43, and the outer wall surface of the inner end of the third pipe fitting 43 is provided with a second step portion 74 capable of abutting against the second shoulder 72.
The soft soil foundation treatment method in the embodiment comprises the following steps:
step 1, paving a cushion layer, namely paving a cushion layer 51 on the surface of a soft soil foundation to be treated.
And 2, arranging a gas-sand mixing and conveying device and a drill rod assembly 20, driving the drill rod assembly 20 to penetrate through a cushion layer 51 and be driven into the soft soil 50 at a corresponding set position through a power device, connecting the air outlet end of the air compressor 12 with the air inlet of the mixing chamber 10, and connecting the conveying pipeline 11 with the outlet of the mixing chamber 10 and the drill rod assembly 20. To facilitate drilling of the drill rod assembly 20 into soft soils, the lower end of the hollow drill rod 21 of the drill rod assembly 20 may be provided with a tapered profile.
And 3, spraying to form a horizontal drainage sand layer 52, opening a control valve 13, adding sand materials into the mixing chamber 10 through a sand material inlet, opening an air compressor 12 to input air into the mixing chamber 10, fully mixing air and sand in the mixing chamber 10 to form air-sand mixed fluid, then conveying the air-sand mixed fluid into a material guide pipe 22 of the drill rod assembly 20 through a material conveying pipe 11, driving the drill rod assembly 20 to rotate through a power device, and spraying the air-sand mixed fluid to the side part through a first spraying hole 31 on a spraying pipe 40 of the drill rod assembly 20 to form the horizontal drainage sand layer 52, wherein in the embodiment, the rotating speed of the drill rod assembly 20 is 10-100r/min, preferably 20-50r/min, and the thickness of the formed horizontal drainage sand layer 52 is 2-50cm, and is usually 5-20 cm.
And 4, spraying to form a vertical drainage sand well 53, lifting the drill rod assembly 20 through a power device after the horizontal drainage sand layer 52 is sprayed, simultaneously opening a second spraying hole 32 correspondingly arranged at the lower end part of the drill rod assembly 20, and spraying the gas-sand mixed fluid downwards through the second spraying hole 32 so as to form the vertical drainage sand well 53 connected with the horizontal drainage sand layer 52 in the process that the drill rod assembly 20 is lifted upwards, wherein the diameter of the vertical drainage sand well 53 is basically the same as that of the drill rod 20, is 30-100cm, preferably 40-60cm, and the diameter of the drill rod 20 can be increased to increase the diameter of the vertical drainage sand well 53, which is detailed in fig. 3.
And 5, constructing a vertical and horizontal three-dimensional drainage network, and sequentially repeating the steps 2 to 4 at the rest set positions to form a stable vertical and horizontal three-dimensional drainage network, wherein horizontal drainage sand layers 52 formed by spraying at the adjacent set positions are continuously jointed in the horizontal direction, and the detailed description is shown in fig. 4 and 5.
In the step 3, the injection pipe 40 may extend outward by 0.2-1.0m, preferably 0.3-0.6m, and specifically, when the injection pipe 40 is first driven by the hydraulic control system to extend to the outermost end, the air-sand mixing and conveying device and the air-sand injection device are started to inject the air sand into the soft soil 50, the first annular horizontal drainage sand layer 52a is laid on the periphery, after the first annular horizontal drainage sand layer 52a is laid, the injection pipe 40 is driven by the hydraulic control system to retract inward by a set distance, the second annular horizontal drainage sand layer 52b is formed by continuous rotary injection, the two adjacent annular horizontal drainage sand layers 52 are sequentially and circularly combined, finally, the injection pipe 40 is completely retracted and is contained in the cavity 200 formed between the hollow drill pipe 21 and the material guide pipe 22, the rotary injection is continued, and finally, the circular horizontal drainage sand layer 52 is laid, see figure 6 for details.
When the injection pipe 40 does not extend out, the radius range of the horizontal drainage sand layer 52 formed by injection can reach 0.5-2.0m (specifically, the operation pressure can be controlled), and when the injection pipe 40 extends out, the radius range of the horizontal drainage sand layer 52 formed by injection can reach 0.7-3.0m, so that the laying range of the horizontal drainage sand layer 52 is effectively enlarged, and the effective treatment area of a soft soil foundation is increased.
The soft soil foundation treatment device in this embodiment has a plurality of advantages:
(1) the soft soil foundation treatment device can fully mix gas and sand to form gas-sand mixed fluid, and then the gas-sand mixed fluid is sprayed into a soft soil layer through a drill rod component 20 of a gas-sand spraying device to form a horizontal drainage sand layer 52 with good water permeability; the horizontal drainage sand layer 52 paved and formed under the action of air force has certain strength and thickness, namely, soft ribs are added to the soft soil, so that the drainage channel is not easy to deform to block, even if the soft soil undergoes a small amount of differential settlement, the differential settlement of the soft soil can be coordinated due to the flexible deformability of the sand layer, and the drainage uniformity and the drainage efficiency are improved; in addition, due to the existence of the horizontal drainage sand layer 52, the additional stress in the soil body is increased, which is equivalent to the increase of the stacking load in the soft soil and the acceleration of the drainage of the soft soil; and finally, filling the horizontal drainage sand layer 52 to reduce the surface subsidence.
(2) Horizontal sand bed cutting soft soil radial soft soil thickness and with the vertical sand shaft that drilling rod subassembly 20 promoted the in-process and formed stable vertical and horizontal three-dimensional drainage network that has constituteed greatly shortens soft soil drainage consolidation time, and the soft soil is higher through the intensity of the consolidation soil body that the drainage was accomplished back and formed, has avoided the post-construction settlement problem.
(3) The telescopic injection pipe 40 in the soft soil foundation treatment device can effectively increase the laying area of the horizontal drainage sand layer 52, and the effective treatment area of the soft soil foundation is increased.
(4) The drill rod assembly 20 can form the horizontal drainage sand layer 52 and the vertical drainage sand well 53 at a time in the process of drilling and drilling soft soil at a time, so that the speed of foundation treatment is effectively increased, other vertical drainage bodies do not need to be additionally laid, and the cost is saved.
Claims (10)
1. A soft soil foundation treatment device, characterized by including:
the gas-sand mixing and conveying device comprises a mixing chamber (10) for fluidizing sand materials to form gas-sand mixed fluid and a gas generating device for providing gas power for the mixing chamber (10), wherein the mixing chamber (10) is provided with a sand material inlet, an air inlet and a discharge hole, the gas generating device is connected with the air inlet of the mixing chamber (10), and the discharge hole is connected with a conveying pipe (11) for conveying the gas-sand mixed fluid;
the air sand spraying device comprises a drill rod component (20) which is used for being downwards inserted into a soft soil layer, the drill rod component (20) is communicated with the material conveying pipe (11), and a first spraying hole (31) which is used for spraying air sand mixed fluid outwards is formed in the drill rod component (20);
and the power device is used for driving the drill rod component (20) to move up and down and driving the drill rod component (20) to rotate around the axis of the power device.
2. A soft soil foundation treatment device as claimed in claim 1, wherein: the drill rod component (20) comprises a hollow drill rod (21) and a material guide pipe (22) arranged in the hollow drill rod (21), the upper end of the material guide pipe (22) is communicated with the material guide pipe (11), an injection pipe (40) extending to the outer wall of the hollow drill rod (21) is further connected to the side wall of the lower portion of the material guide pipe (22), and a port of the injection pipe (40) forms a first injection hole (31).
3. A soft soil foundation treatment device as claimed in claim 2, wherein: the injection pipe (40) is a telescopic pipe which can extend outwards along the radial direction of the hollow drill rod (21) and can retract inwards to be accommodated in a cavity (200) formed between the hollow drill rod (21) and the material guide pipe (22).
4. A soft soil foundation treatment device as claimed in claim 3, wherein: the injection pipe (40) is one of a one-stage telescopic pipe, a two-stage telescopic pipe or a multi-stage telescopic pipe.
5. A soft soil foundation treatment device as claimed in claim 3, wherein: the injection pipe (40) is a two-stage telescopic pipe and comprises a first pipe (41), a second pipe (42) and a third pipe (43) which are sequentially connected along the length direction, the first pipe (41) is connected between the hollow drill rod (21) and the material guide pipe (22), a first annular groove liquid cavity (410) which is coaxially arranged with the first pipe (41) is arranged on the wall of the first pipe (41), the first annular groove liquid cavity (410) is communicated with an external hydraulic pipeline, the second pipe (42) is movably arranged in the first annular groove liquid cavity (410) along the axial direction and can extend outwards under the hydraulic action, a second annular groove liquid cavity (420) which is coaxially arranged with the second pipe (42) is arranged on the wall of the second pipe (42), the second annular groove liquid cavity (420) is communicated with the first annular groove liquid cavity (410), and the third pipe (43) is movably arranged in the second annular groove liquid cavity (420) along the axial direction and can extend outwards under the hydraulic action And the first injection hole (31) is positioned at the outer end part of the third pipe fitting (43).
6. A soft soil foundation treatment apparatus as claimed in any one of claims 2 to 5, wherein: the injection pipes (40) are correspondingly provided with a plurality of groups along the length direction of the material guide pipe (22), each group of injection pipes (40) comprises three injection pipes (40), and the three injection pipes (40) are uniformly arranged at intervals along the circumferential direction of the material guide pipe (22).
7. A soft soil foundation treatment device as claimed in claim 2, wherein: the lower extreme of passage (22) is connected the bottom of hollow drill rod (21), the lower extreme of passage (22) has second jet orifice (32) that air feed sand mixes fluid and jets out downwards, be equipped with second valve (33) that can seal or the second jet orifice (32) of opening on second jet orifice (32), also be equipped with first valve (34) that can seal or the first jet orifice (31) of opening on first jet orifice (31).
8. A soft soil foundation treatment device as claimed in claim 1, wherein: the gas generating device is an air compressor (12).
9. A soft soil foundation treatment method using the soft soil foundation treatment device according to any one of claims 1 to 8, characterized by comprising the steps of:
step 1, paving a cushion layer (51), namely paving the cushion layer (51) on the surface of a soft soil foundation to be treated;
step 2, arranging a gas-sand mixing and conveying device and a drill rod assembly (20), driving the drill rod assembly (20) to penetrate through a cushion layer (51) and be driven into soft soil through a power device, connecting a gas generating device with a gas inlet of a mixing chamber (10), and connecting a conveying pipeline (11) with an outlet of the mixing chamber (10) and the drill rod assembly (20);
step 3, spraying to form a horizontal drainage sand layer (52), adding sand into the mixing chamber (10) through a sand inlet, starting the gas generating device to input gas into the mixing chamber (10), fully mixing gas and sand in the mixing chamber (10) to form gas-sand mixed fluid, then conveying the gas-sand mixed fluid into the drill rod assembly (20) through the conveying pipe (11), and simultaneously driving the drill rod assembly (20) to rotate through the power device to spray the gas-sand mixed fluid to the side part through a first spray hole (31) of the drill rod assembly (20) to form the horizontal drainage sand layer (52);
step 4, forming a vertical drainage sand well (53) by injection, lifting the drill rod assembly (20) through a power device after the horizontal drainage sand layer (52) is injected, simultaneously opening a second injection hole (32) correspondingly arranged at the lower end part of the drill rod assembly (20), and enabling the gas-sand mixed fluid to be downwards injected through the second injection hole (32) so as to form the vertical drainage sand well (53) connected with the horizontal drainage sand layer (52) in the process that the drill rod assembly (20) is lifted upwards;
and 5, constructing a vertical and horizontal three-dimensional drainage network, and sequentially repeating the steps 2-4 at the rest set positions to form a stable vertical and horizontal three-dimensional drainage network, wherein horizontal drainage sand layers (52) formed by spraying at the adjacent set positions are continuously jointed in the horizontal direction.
10. A soft soil foundation treatment method as claimed in claim 9, characterised in that:
the drill rod assembly (20) comprises a hollow drill rod (21) and a material guide pipe (22) arranged in the hollow drill rod (21), the upper end of the material guide pipe (22) is communicated with the material guide pipe (11), the side wall of the lower part of the material guide pipe (22) is also connected with an injection pipe (40) extending to the outer wall of the hollow drill rod (21), the port of the injection pipe (40) forms the first injection hole (31), and the injection pipe (40) is a telescopic pipe which can extend outwards along the radial direction of the hollow drill rod (21) and can retract inwards to be accommodated in a cavity between the hollow drill rod (21) and the material guide pipe (22);
in step 3, the injection pipe (40) extends outwards by 0.2-1.0m, a first annular horizontal drainage sand layer (52a) is firstly paved on the periphery, then the injection pipe is sequentially retracted inwards to a set distance, and then a second annular horizontal drainage sand layer (52b) is continuously injected to form, and the circular horizontal drainage sand layer (52) is finally paved by sequentially and circularly combining two adjacent annular horizontal drainage sand layers.
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| CN201911252918.4A CN110847150A (en) | 2019-12-09 | 2019-12-09 | Soft soil foundation treatment device and method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111851462A (en) * | 2020-07-31 | 2020-10-30 | 中南林业科技大学 | Soft soil foundation treatment method |
| CN112246856A (en) * | 2020-09-29 | 2021-01-22 | 徐州徐工环境技术有限公司 | Pollute original flavor of soil and restore injection device |
| CN113047263A (en) * | 2021-04-06 | 2021-06-29 | 合肥工业大学 | Combined vertical drainage body construction system and construction method thereof |
| CN113216839A (en) * | 2021-05-10 | 2021-08-06 | 南京工业大学 | Excavation-free targeted replacement device and method for local soft soil layer |
-
2019
- 2019-12-09 CN CN201911252918.4A patent/CN110847150A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111851462A (en) * | 2020-07-31 | 2020-10-30 | 中南林业科技大学 | Soft soil foundation treatment method |
| CN112246856A (en) * | 2020-09-29 | 2021-01-22 | 徐州徐工环境技术有限公司 | Pollute original flavor of soil and restore injection device |
| CN113047263A (en) * | 2021-04-06 | 2021-06-29 | 合肥工业大学 | Combined vertical drainage body construction system and construction method thereof |
| CN113216839A (en) * | 2021-05-10 | 2021-08-06 | 南京工业大学 | Excavation-free targeted replacement device and method for local soft soil layer |
| CN113216839B (en) * | 2021-05-10 | 2022-06-14 | 南京工业大学 | Excavation-free targeted replacement device and method for local soft soil layer |
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