CN114411827A - Vacuum prepressing microorganism grouting rib composite pile foundation model for foundation stabilization - Google Patents
Vacuum prepressing microorganism grouting rib composite pile foundation model for foundation stabilization Download PDFInfo
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- CN114411827A CN114411827A CN202210034480.8A CN202210034480A CN114411827A CN 114411827 A CN114411827 A CN 114411827A CN 202210034480 A CN202210034480 A CN 202210034480A CN 114411827 A CN114411827 A CN 114411827A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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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
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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
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
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- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
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Abstract
The invention discloses a vacuum prepressing microorganism grouting rib composite pile foundation model for foundation reinforcement, which comprises a tubular pile, wherein an inner pile is arranged in the tubular pile, a gap is formed between the inner pile and the tubular pile, the top of the tubular pile and the inner pile are connected with a detachable top cover, a threaded fine pile is fixed at the bottom of the tubular pile, the vacuum pile further comprises a bacteria liquid box, a cementing liquid box and a vacuum pump, a first liquid outlet pipe is arranged on the bacteria liquid box, a second liquid outlet pipe is arranged on the cementing liquid box, the first liquid outlet pipe and the second liquid outlet pipe are both connected with a liquid inlet pipe, and the liquid inlet pipe is connected with a grouting pipe; the vacuum pump is connected with the vacuum pipe, and the grouting pipe and the vacuum pipe are introduced into the gap between the pipe pile and the inner pile. The composite pile foundation model can solve the problems of insufficient uplift bearing capacity or excessive pile body settlement of a single pile diameter in the prior art, can also change the number and length of the piles, can simulate indoor tubular pile model tests under different conditions, is convenient for developing the indoor tests of the stress mechanism of the tubular pile, and improves the test accuracy and the working efficiency.
Description
Technical Field
The invention belongs to the technical field of foundation stabilization equipment, and particularly relates to a vacuum preloading microorganism grouting rib forming composite pile foundation model for foundation stabilization.
Background
In order to ensure the reliability and safety of the building foundation and solve the problem of bad soil, some physical or chemical means are usually adopted to reinforce the foundation soil. The physical methods mainly comprise a dynamic compaction method, a replacement method and the like, but the physical methods have larger noise and vibration and cause great disturbance to soil bodies. The chemical method is mainly characterized in that lime, cement fly ash and other chemical reinforcing agents capable of effectively improving the engineering performance of the soil body are added, but the production of the chemical reinforcing agents consumes a large amount of energy materials, and harmful gases such as carbon dioxide and sulfur dioxide are generated in the reinforcing process, so that the air quality is polluted, and the serious harm is caused to the surrounding environment and the human health. In order to implement the concept of green and sustainable development, the microorganism induced calcium carbonate (MICP) becomes a considerable novel soil body reinforcement technology. Compared with the traditional physical strengthening method, the microorganism induced calcium carbonate precipitation (MICP) has the advantages of environmental protection, small disturbance to soil and the like. By utilizing microorganisms existing in soil and injecting a cementing solution (a mixed solution of urea and calcium ions), bacteria and the cementing solution are subjected to mineralization reaction to generate calcium carbonate precipitates, soil particles are cemented and filled, the permeability of a soil body is reduced, the soil body strength is increased, and the overall stability of a foundation soil body is improved.
Disclosure of Invention
The invention aims to provide a vacuum prepressing microorganism slip casting rib composite pile foundation model for foundation reinforcement, which solves the problem that the horizontal uplift bearing performance and the vertical bearing performance of the existing pile foundation model are not matched, and can effectively reduce the settlement amount of a single pile.
The technical scheme adopted by the invention is that the vacuum prepressing microorganism grouting rib composite pile foundation model for foundation reinforcement comprises a tubular pile, an inner pile is arranged in the tubular pile, a gap is arranged between the inner pile and the tubular pile, the top of the tubular pile and the top of the inner pile are connected with a detachable top cover, and a slurry inlet and an air suction opening are arranged on the detachable top cover; the bottom of the tubular pile is also fixedly provided with a plurality of threaded thin piles, and the tubular pile further comprises a bacteria liquid box, a cementing liquid box and a vacuum pump, wherein the bacteria liquid box is provided with a first liquid outlet pipe; the vacuum pump is connected with the vacuum pipe, and the grouting pipe and the vacuum pipe are respectively led into the gap between the tubular pile and the inner pile through the grout inlet and the air exhaust port.
The present invention is also characterized in that,
the threaded thin pile comprises a thin pile, the end of the thin pile extends into the bottom of the tubular pile, threads are arranged at the extending end of the thin pile, and the thin pile and the tubular pile are fixed through the threads and the fixing nut.
A plurality of draw-in grooves are welded in the bottom of the tubular pile along the circumferential direction, a plurality of buckles are welded at the bottom of the inner pile, and the tubular pile and the inner pile are connected together in a buckling mode through the buckles and the draw-in grooves.
The tubular pile lateral wall evenly sets up a plurality of injected holes.
The outer wall of the pipe pile is also coated with a layer of plastic film.
The tubular pile and the inner pile are connected with the detachable top cover through a plurality of hexagon screws.
Liquid outlet valves are arranged on the first liquid outlet pipe and the second liquid outlet pipe, and liquid inlet valves are arranged on the liquid inlet pipes.
The invention has the beneficial effects that the local pressure source difference is formed at the joint of the inner hole of the soil body and the pile body by utilizing the annular vacuumizing structure at the inner side of the pile body, and microorganisms and cementing liquid are transported to the periphery of the pile through the side hole of the pile so as to form the annular bamboo joint reinforcing rib. The composite pile foundation model can solve the problem that the bearing capacity of a single pile diameter is insufficient in the prior art, the number and the length of the piles can be changed, indoor pipe pile model tests under different conditions can be simulated, indoor tests of pipe pile stress mechanisms can be conveniently carried out, and the test accuracy and the work efficiency are improved. Compared with a full-scale field test, the indoor experiment performed by adopting the composite pile foundation model has strong operability and high repeatability, can timely supplement the field test, has small in-situ foundation disturbance, and provides a certain rule and theoretical basis for the practical engineering application of the pile foundation reinforced foundation soil body.
Drawings
FIG. 1 is a schematic structural diagram of a vacuum prepressing microorganism grouting rib-forming composite pile foundation model for foundation stabilization according to the present invention;
FIG. 2 is a schematic longitudinal section of a vacuum prepressing microorganism grouting rib composite pile foundation model for foundation stabilization according to the present invention;
FIG. 3 is a top view of a vacuum prepressing microbial grouting rib composite pile foundation model for foundation stabilization according to the present invention;
FIG. 4 is a schematic view (I) of the connection between a pipe pile and the bottom of an inner pile in the vacuum preloading microorganism grouting rib-forming composite pile foundation model for foundation stabilization according to the invention;
FIG. 5 is a schematic view (II) of the connection between a pipe pile and the bottom of an inner pile in the vacuum preloading microorganism grouting rib-forming composite pile foundation model for foundation stabilization according to the invention;
fig. 6 is a schematic structural diagram of a threaded thin pile in a vacuum preloading microorganism grouting rib composite pile foundation model for foundation reinforcement.
In the figure: 1. a tubular pile; 2. internal piling; 3. a hex screw; 4. a removable top cover; 5. a first liquid outlet pipe; 6. a second liquid outlet pipe; 7. a card slot; 8. fine piling; 9. grouting holes; 10. fixing a nut; 11. a thread; 12. a bacteria liquid box; 13. a cementing liquid tank; 14. a grouting pipe; 15. a liquid inlet pipe; 16. a plastic film; 17. a vacuum pump; 18. a vacuum tube; 19. and (5) buckling.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention relates to a vacuum preloading microorganism grouting rib composite pile foundation model for foundation reinforcement, which comprises a tubular pile 1, wherein an inner pile 2 is arranged inside the tubular pile 1, a gap is arranged between the inner pile 2 and the tubular pile 1, a plurality of clamping grooves 7 are welded in the bottom of the tubular pile 1 along the circumferential direction, as shown in fig. 4 and 5, a plurality of buckles 19 are welded at the bottom of the inner pile 2, and the tubular pile 1 and the inner pile 2 are buckled together through the buckles 19 and the clamping grooves 7; the top of the tubular pile 1 and the top of the inner pile 2 are both connected with a detachable top cover 4 through a plurality of hexagon screws 3; the detachable top cover 4 is provided with a pulp inlet and an air exhaust port;
a plurality of threaded thin piles are further fixed at the bottom of the tubular pile 1, as shown in fig. 6, each threaded thin pile comprises a thin pile 8, the end part of each thin pile 8 extends into the bottom of the tubular pile 1, a thread 11 is arranged at the extending end, and as shown in fig. 3, each thin pile 8 and the tubular pile 1 are fixed through the thread 11 and a fixing nut 10; the height of the whole model is changed by changing the position of the thread 11 to the fixing nut 10, and meanwhile, in order to prevent the stress concentration phenomenon generated when the tubular pile 1 is subjected to an external force load, a gasket can be added at the bottom of the fixing nut 10 and the tubular pile 1.
The tubular pile 1 is made of a thick steel pipe, and can be made into a proper size according to test requirements, the bottom of the tubular pile 1 is sealed, and a hole corresponding to the size of the threaded thin pile needs to be reserved, so that the tubular pile 1 and the threaded thin pile can be fixedly connected by penetrating through the fixing nut 10;
the device is characterized by further comprising a bacterium liquid box 12, a cementing liquid box 13 and a vacuum pump 17, wherein a first liquid outlet pipe 5 is arranged on the bacterium liquid box 12, a second liquid outlet pipe 6 is arranged on the cementing liquid box 13, the first liquid outlet pipe 5 and the second liquid outlet pipe 6 are both connected with a liquid inlet pipe 15, liquid outlet valves are both arranged on the first liquid outlet pipe 5 and the second liquid outlet pipe 6, a liquid inlet valve is arranged on the liquid inlet pipe 15, and the liquid inlet pipe 15 is connected with a grouting pipe 14; the grouting pipe 14 is introduced into the gap between the tubular pile 1 and the inner pile 2 through a grout inlet; the vacuum pump 17 is connected with a vacuum tube 18, and the vacuum tube 18 is introduced into a gap between the tubular pile 1 and the inner pile 2 through an air suction port;
the side wall of the tubular pile 1 is uniformly provided with a plurality of grouting holes 9, so that the bacterial liquid and the cementing liquid are infiltrated into soil around the grouting holes 9 outwards to generate a microbial mineralization reaction, and transverse annular bamboo joints are formed at the grouting holes 9 to form a reinforced body, thereby improving the stability of a pile foundation model;
the outer wall of the tubular pile 1 is further coated with a layer of plastic film 16, the plastic film 16 is made of special transparent polyethylene materials, microporous filtration can be carried out, closed environmental conditions are guaranteed during vacuumizing, and meanwhile, the situation that soil around the tubular pile 1 enters the tubular pile 1 through the grouting holes 9 during vacuumizing and subsequent tests of a pile foundation model are influenced is prevented;
the grouting pipe 14 is made of a transparent plastic hose and is used for transmitting the bacterial liquid and the cementing liquid, and a valve controls the outflow of the bacterial liquid and the cementing liquid;
the vacuum tube 18 is made of a PVC tube, and the interior of the tubular pile 1 is vacuumized to form an internal pressure difference and an external pressure difference of the tubular pile 1, so that the bacteria liquid and the cementing liquid can smoothly flow into the tubular pile 1.
The bacterial liquid is activated by adding bacillus pasteurii into a proper culture medium and cultured under aerobic conditions at 37 ℃; the cementing liquid is a mixed solution of urea and calcium ions, and a laboratory can be configured with proper mass concentration according to the requirement.
When the vacuum preloading microorganism grouting rib-forming composite pile foundation model for foundation reinforcement is utilized to carry out foundation reinforcement, the composite pile foundation model is firstly manufactured according to requirements. Manufacturing a rigid tubular pile 1 by a thick steel pipe according to the required size, sealing the bottom of the tubular pile 1 per se, and reserving a hole diameter which is in accordance with the size of the thin pile for fixedly connecting the thin pile 8 with the tubular pile 1; putting the inner pile 2 into the tubular pile 1, and carrying out buckle type connection on a buckle 19 of the rotary rigid inner pile 2 and a proper position of a clamping groove 7 at the bottom of the tubular pile 1; connecting the thin pile 8 into the tubular pile 1 through a fixing nut 10, and controlling the distance from the thread 11 to the fixing nut 10 to change the overall height of the model according to a composite pile foundation model required by a test; the tubular pile 1 and the detachable top cover 4 are fixedly connected through the hexagon screws 3.
After the composite pile foundation model is installed, as shown in fig. 1, a plastic film 16 is wrapped on the outer side of the tubular pile 1 to ensure that a closed state is formed, a vacuum tube 18 is connected to an air exhaust hole on the detachable top cover 4, a vacuum pump 17 is opened, and air in the tubular pile 1 is extracted, so that a pressure source difference is formed inside and outside the tubular pile 1; meanwhile, a liquid box containing bacteria liquid is connected to a grout inlet through a grouting pipe 14, a liquid outlet valve and a liquid inlet valve on a bacteria liquid box 12 are opened until bacteria injection is finished, the liquid outlet valve is closed, a liquid outlet valve on a cementing liquid box 13 is opened until cementing liquid is output, the valves are closed, the bacteria liquid and the cementing liquid flow into a gap between the tubular pile 1 and the inner pile 2, a vacuum pump 17 is opened due to the fact that pressure source difference exists between the inside and the outside of the tubular pile 1, gas is input into the tubular pile 1, the bacteria liquid and the cementing liquid are enabled to be sequentially immersed into soil around the tubular pile 1 through a grouting hole 9 and a plastic film 16, rapid migration and fixation of microorganisms and the cementing liquid inside soil are promoted, mineralization reaction of the bacteria liquid and the cementing liquid inside soil pores is achieved, soil particles are cemented, the soil strength near the grouting hole 9 is improved, a reinforcing body with ribs formed by transverse rings is formed, and the friction force between the pile foundation and the soil is increased, the horizontal bearing capacity and the uplift resistance of the pile body are improved.
In the experiment, the stress condition of the pile foundation is simulated by utilizing the vacuum prepressing microorganism slip casting rib composite pile foundation model according to the requirement. Through changing the number of threaded micropile through fixation nut in the tubular pile bottom and changing the micropile quantity, thereby adjust the whole height of draw-in groove length change composite pile foundation model, pile foundation loading condition under the simulation different conditions.
The novel microorganism induced calcium carbonate precipitation (MICP) technology is combined with the novel pile foundation, and the foundation soil body is reinforced in a green and environment-friendly manner. The main innovation points of the invention comprise: (1) the side wall of a main pile of the composite pile foundation is provided with a plurality of grouting holes, and bamboo joint pile annular ribs are formed along the periphery of the pile by adopting a microorganism reinforcing method, so that the horizontal bearing performance of a soil body and the uplift resistance of a pile body are improved; (2) the bottom of the main pile of the composite pile foundation is provided with a plurality of thin piles, so that the vertical bearing performance of the pile body is improved, and simultaneously, the soil body settlement caused by the self weight of the pile body can be reduced, thereby meeting the requirements of the foundation on vertical deformation and stability; (3) the external pressure difference around the pile formed by the annular vacuumizing structure on the inner side of the pile body can promote the migration of microbial reagents in the soil body and improve the rib forming speed of the pile foundation.
According to the vacuum preloading microorganism grouting rib composite pile foundation model for foundation reinforcement, a local pressure source difference is formed at the joint of the inner hole of a soil body and the pile body, the pressure in the hole of the soil body around the pile is reduced, a bacterium liquid pipeline and a cementing liquid in the pile body penetrate into the inner hole of the soil body around the pile, biochemical reaction is carried out to generate calcium carbonate precipitation cementing soil body particles, bamboo-shaped reinforcing ribs are formed along the periphery of the pile, and therefore the effects of improving the horizontal bearing performance and the uplift bearing performance of the foundation are achieved; on the other hand sets up a plurality of thin piles at the straight stake basal portion, forms novel compound pile foundation, improves the vertical bearing capacity of pile foundation, reduces vertical deformation's effect.
Claims (7)
1. The vacuum preloading microorganism grouting rib-forming composite pile foundation model for foundation reinforcement is characterized by comprising a tubular pile (1), wherein an inner pile (2) is arranged inside the tubular pile (1), a gap is formed between the inner pile (2) and the tubular pile (1), the top of the tubular pile (1) and the top of the inner pile (2) are connected with a detachable top cover (4), and a slurry inlet and an air suction opening are formed in the detachable top cover (4); the bottom of the tubular pile (1) is further fixed with a plurality of threaded thin piles, and further comprises a bacterium liquid box (12), a cementing liquid box (13) and a vacuum pump (17), wherein a first liquid outlet pipe (5) is arranged on the bacterium liquid box (12), a second liquid outlet pipe (6) is arranged on the cementing liquid box (13), the first liquid outlet pipe (5) and the second liquid outlet pipe (6) are both connected with a liquid inlet pipe (15), and the liquid inlet pipe (15) is connected with a grouting pipe (14); vacuum pump (17) are connected with vacuum tube (18), slip casting pipe (14) and vacuum tube (18) let in the clearance of tubular pile (1) and interior stake (2) through advancing thick liquid mouth and extraction opening respectively.
2. The vacuum preloading microorganism slip casting for foundation stabilization becomes rib composite pile foundation model according to claim 1, characterized in that, threaded thin pile includes thin pile (8), thin pile (8) tip stretches into tubular pile (1) bottom, and stretches into the end and be provided with screw thread (11), thin pile (8) are fixed through screw thread (11) and fixation nut (10) with tubular pile (1).
3. The vacuum preloading microorganism slip casting rib composite pile foundation model for foundation stabilization according to claim 1, characterized in that, there are a plurality of draw-in grooves (7) in the welding of tubular pile (1) bottom along circumference, there are a plurality of buckles (19) in the welding of inner pile (2) bottom, tubular pile (1) and inner pile (2) are in the same place through buckle (19) and draw-in groove (7) lock joint.
4. The vacuum preloading microorganism slip casting rib composite pile foundation model for foundation stabilization according to claim 1, characterized in that a plurality of slip casting holes (9) are evenly arranged on the side wall of the tubular pile (1).
5. The vacuum preloading microorganism slip casting rib composite pile foundation model for foundation reinforcement according to claim 1, characterized in that the outer wall of the pipe pile (1) is further coated with a layer of plastic film (16).
6. The vacuum preloading microorganism slip casting rib composite pile foundation model for foundation stabilization according to claim 1, wherein the pipe pile (1) and the internal pile (2) are connected with the detachable top cover (4) through a plurality of hexagon screws (3).
7. The vacuum preloading microorganism slip casting rib composite pile foundation model for foundation stabilization according to claim 1, wherein liquid outlet valves are arranged on the first liquid outlet pipe (5) and the second liquid outlet pipe (6), and a liquid inlet valve is arranged on the liquid inlet pipe (15).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210034480.8A CN114411827B (en) | 2022-01-12 | 2022-01-12 | Vacuum precompaction microorganism grouting ribbed composite pile foundation model for foundation reinforcement |
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| CN202210034480.8A CN114411827B (en) | 2022-01-12 | 2022-01-12 | Vacuum precompaction microorganism grouting ribbed composite pile foundation model for foundation reinforcement |
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| CN114411827B CN114411827B (en) | 2023-07-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114892638A (en) * | 2022-05-19 | 2022-08-12 | 辽宁工程技术大学 | Negative-pressure rotary grouting device based on MICP technology and application method |
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| CN111945702A (en) * | 2020-07-02 | 2020-11-17 | 福建鼎拓工程勘察设计有限公司 | Rapid pile body arranging method for reinforcing large-area soft foundation |
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| CN114892638A (en) * | 2022-05-19 | 2022-08-12 | 辽宁工程技术大学 | Negative-pressure rotary grouting device based on MICP technology and application method |
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