CN113622441A - Foundation pit dewatering and enclosure method for carbon fiber cloth reinforced concrete porous spiral pipe pile - Google Patents
Foundation pit dewatering and enclosure method for carbon fiber cloth reinforced concrete porous spiral pipe pile Download PDFInfo
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- 239000004744 fabric Substances 0.000 title claims abstract description 55
- 229920000049 Carbon (fiber) Polymers 0.000 title claims abstract description 53
- 239000004917 carbon fiber Substances 0.000 title claims abstract description 53
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 45
- 239000011150 reinforced concrete Substances 0.000 title claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 49
- 238000005370 electroosmosis Methods 0.000 claims abstract description 39
- 239000002689 soil Substances 0.000 claims abstract description 34
- 230000008569 process Effects 0.000 claims abstract description 15
- 238000005553 drilling Methods 0.000 claims abstract description 11
- 238000005086 pumping Methods 0.000 claims description 18
- 230000009471 action Effects 0.000 claims description 4
- 238000009412 basement excavation Methods 0.000 claims description 4
- 239000003657 drainage water Substances 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 4
- 239000011148 porous material Substances 0.000 claims description 3
- 230000002787 reinforcement Effects 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 13
- 239000004567 concrete Substances 0.000 abstract description 6
- 230000006835 compression Effects 0.000 abstract description 5
- 238000007906 compression Methods 0.000 abstract description 5
- 230000007797 corrosion Effects 0.000 abstract description 4
- 238000005260 corrosion Methods 0.000 abstract description 4
- 239000007772 electrode material Substances 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 4
- 239000002184 metal Substances 0.000 abstract description 3
- 238000001556 precipitation Methods 0.000 abstract description 3
- 230000001105 regulatory effect Effects 0.000 abstract description 2
- 238000011161 development Methods 0.000 description 4
- 230000003014 reinforcing effect Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000000452 restraining effect Effects 0.000 description 2
- 238000005266 casting Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement 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
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/10—Restraining of underground water by lowering level of ground water
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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
- E02D3/11—Improving or preserving soil or rock, e.g. preserving permafrost soil by thermal, electrical or electro-chemical means
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- Structural Engineering (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
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- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses a foundation pit dewatering and enclosing method for a carbon fiber cloth reinforced concrete porous spiral pipe pile. The prefabricated carbon fiber cloth reinforced concrete porous spiral pipe pile is convenient to construct, has better compression resistance and pull-out resistance, and can smoothly drill into the ground when being wrapped with the carbon fiber cloth. The bearing capacity and the stability of the carbon fiber cloth wrapped on the tubular pile are relatively improved, so that the concrete grade can be reduced, the material cost is saved, meanwhile, the carbon fiber cloth can be used as an electroosmosis electrode material to fully play the advantages of an electroosmosis method in soft soil foundation pit dewatering, compared with a metal electrode, the carbon fiber cloth is not easily affected by corrosion and has strong durability, and a spiral drilling mode is tightly contacted with a soil body, so that good electric contact working performance is provided. During construction, the prefabricated pipe pile is drilled into the soil by a drilling machine, then a power supply is connected for electroosmotic drainage, water is pumped out by a drainage system, the pipe pile continues to be used as a fender pile after precipitation is finished, and underground water level can be timely regulated and controlled in the subsequent service process.
Description
Technical Field
The invention belongs to the field of foundation pit engineering, and particularly relates to a foundation pit dewatering and enclosure method of a carbon fiber cloth reinforced concrete porous spiral pipe pile.
Background
With the rapid construction of cities and the increasing number of population in China, the urban land resources are in short supply and the traffic pressure is increased greatly, while the current era is the golden era of underground space development and utilization, and the reasonable development and utilization of urban underground space and the construction of the urban underground space into efficient underground traffic engineering are one of the effective methods for solving the urban road traffic problem at present. Along with the construction and development of underground passages of various cities, the scale and excavation difficulty of foundation pits faced by open cut method construction are gradually increased, the requirements on a foundation pit enclosure system are also continuously increased, and the precipitation method and the design and construction of enclosure piles are very important parts in the foundation pit construction process.
For soft soil widely distributed in coastal areas, as the soft soil has the characteristics of high water content, high compressibility, low permeability, low shear strength and the like, an electroosmosis method in various drainage consolidation methods can realize efficient drainage, but factors such as high later-stage energy consumption, serious corrosion of electrode materials, reduction of contact between an electrode and a soil body and the like limit the development and application of the soft soil in engineering. The carbon fiber cloth has wide application prospect in the field of electroosmosis due to good conductivity, higher strength, flexibility in contact with a soil body and no easy corrosion characteristic of the traditional metal material. However, the carbon fiber cloth cannot be easily driven into the ground like other rigid materials, and thus is difficult to be applied to foundation pit engineering. Considering the feasibility of allowing the screw pile to carry the carbon fiber cloth to enter the ground, the screw pile has higher compression resistance and higher pulling resistance compared with a driving pile. The concrete screw pile can bring the carbon fiber cloth wrapped on the surface of the concrete screw pile into the ground together, so that the possibility of applying the carbon fiber cloth to the fender pile is created.
At present, a well point dewatering method is generally adopted for foundation pit dewatering in coastal areas, a large number of cast-in-place pile rows are generally adopted for foundation pit support, and a method which can utilize electroosmosis advantages to drain and reinforce soil bodies and integrate dewatering and support by combining well point dewatering and foundation pit support is lacked for soft soil layers.
Disclosure of Invention
The invention provides a foundation pit dewatering and enclosing method of a carbon fiber cloth reinforced concrete porous spiral pipe pile, which aims to effectively expand the advantages of an electroosmosis method in foundation pit dewatering in a soft soil area, solve a series of defects of a traditional electrode electroosmosis method, tightly combine dewatering with enclosure in the foundation pit construction process and facilitate underground water level control in the service process.
The purpose of the invention is realized by the following technical scheme: a foundation pit dewatering and enclosing method for a carbon fiber cloth reinforced concrete porous spiral pipe pile comprises the following steps:
(1) determining the point position and the model of the tubular pile according to the size of the foundation pit and the underground water level distribution at the position of the foundation pit, and prefabricating a corresponding reinforced concrete porous spiral tubular pile; the structure of precast tubular pile does: a plurality of rows of round holes are distributed on the wall of the tubular pile along the length direction of the tubular pile, a threaded groove is formed in the middle lower part of the wall of the tubular pile, the carbon fiber cloth is tightly wrapped and fixed on the outer wall of the tubular pile, and external threads are embedded in the outer side of the carbon fiber cloth at the threaded groove;
(2) a drilling machine is in place and drills the precast tubular piles into the well-arranged point positions in sequence;
(3) arranging a power supply system and a pumping system, connecting the anode pipe piles with the positive pole of a power supply, connecting the cathode pipe piles with the negative pole of an electrode, installing submersible pumps in the pipe piles and arranging pumping pipelines to determine the safety of the power supply system and the smoothness of the pumping system;
(4) switching on a power supply to perform electroosmotic drainage, and then starting different submersible pumps to pump water for each tubular pile;
(5) after electroosmosis drainage is carried out for a period of time, the power is cut off and the electrode is reversed, then the power supply is switched on again for electroosmosis drainage, and the process is repeated for many times to ensure that the underground water level of the foundation pit is uniformly distributed;
(6) after the electroosmosis drainage is powered off and the water pumping is stopped, the tubular pile can reinforce soil around the pile, play a better role in enclosing foundation pit excavation, and can timely regulate and control the underground water level in the subsequent service process.
Further, in the step (2), the drilling speed of the tubular pile is 1-4 r/min under different soil conditions.
Further, in the step (4), for the cathode pipe pile with a higher water level under the electroosmosis action, a higher submersible pump power and a longer water pumping time are adopted.
Further, the first no screw thread region of tubular pile, tubular pile wall evenly set up the multirow round hole along stake length direction, and two adjacent rows of distances are 5 ~ 10 times round hole diameter, and every row evenly arranges 4 round holes.
Further, in the lower half portion thread area of the tubular pile, a round hole is formed in the wall of the tubular pile along the same direction as the thread angle every other quarter of the circumference, and the round hole is located between every two adjacent layers of threads and does not overlap with the threads.
Further, the porous structure of the tubular pile enables pore water of surrounding strata and electroosmosis cathode drainage to be collected and enter the tubular pile and then be pumped by a water suction pump.
Furthermore, the spiral groove and the external thread form a spiral structure of the tubular pile, the spiral structure is distributed in the range from the tip end to 40% of the length of the tubular pile upwards, and the thread angle is set to be 30-45 degrees; the protruding part of the external thread relative to the pipe wall is preferably 9% -11% of the diameter of the pile body, and the pitch of the external thread is consistent with the distance between two adjacent rows of the round holes and does not shield the round holes.
Furthermore, the spiral structure of the tubular pile needs to comprehensively consider the close contact between the carbon fiber cloth and the tubular pile and the close contact between the carbon fiber cloth and the soil body, and the original structure of the carbon fiber cloth is not damaged by too much resistance in the process of screwing the tubular pile into the soil body.
Furthermore, the arrangement of the cathode and anode tubular piles should not enable the electroosmosis drainage water flow direction to repel and block the smooth drainage, and the cathodes and the anodes can be arranged in a staggered mode; the corner tubular piles of the building enclosure should adopt cathodes so as to gather and extract more electroosmotic drainage.
Furthermore, the electrode is reversed after the water is drained by the electroosmosis in one stage, and the electroosmosis is continued after the positions of the cathode and the anode are exchanged, so that the reinforcing effect of the tubular pile on the surrounding soil body tends to be uniform, the underground water level distribution of the foundation pit tends to be uniform, and more water can be drained efficiently.
The invention has the beneficial effects that: the prefabricated reinforced concrete porous spiral pipe pile wrapped with the carbon fiber cloth outside is adopted for dewatering and enclosing the foundation pit construction. The prefabricated porous spiral pipe pile is convenient to construct, has good compression resistance and pull-out resistance, and can smoothly drill into the ground when being wrapped with the carbon fiber cloth. The bearing capacity and the stability of the carbon fiber cloth wrapped on the tubular pile are relatively improved, so that the concrete grade can be reduced, the material cost is saved, meanwhile, the carbon fiber cloth can be used as an electroosmosis electrode material to fully play the advantages of an electroosmosis method in soft soil foundation pit dewatering, compared with a metal electrode, the carbon fiber cloth is not easily affected by corrosion and has strong durability, and a spiral drilling mode is tightly contacted with a soil body, so that good electric contact working performance is provided. During construction, the prefabricated pipe pile is drilled into the soil by a drilling machine, then a power supply is connected for electroosmotic drainage, water is pumped out by a drainage system, the pipe pile continues to be used as a fender pile after precipitation is finished, and underground water level can be timely regulated and controlled in the subsequent service process.
Drawings
FIG. 1 is a schematic view of a pile provided by an embodiment of the present invention prior to casting a thread;
FIG. 2 is an enlarged view of a section 1-1 of a post having a thread cast therein according to an embodiment of the present invention;
FIG. 3 is a schematic view of the coverage of the carbon fiber cloth on the pile according to the embodiment of the invention;
FIG. 4 is a schematic diagram of an electrode arrangement for a stake provided in accordance with an embodiment of the present invention;
in the figure, a tubular pile 1, a round hole 2, a thread groove 3, an external thread 4 and a carbon fiber cloth 5.
Detailed Description
For better understanding of the technical solutions of the present application, the following detailed descriptions of the embodiments of the present application are provided with reference to the accompanying drawings.
It should be understood that the embodiments described are only a few embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The embodiment of the invention provides a foundation pit dewatering and enclosure method of a carbon fiber cloth reinforced concrete porous spiral pipe pile, which mainly comprises the following steps:
(1) determining the point position and the model of the tubular pile according to the size of the foundation pit and the underground water level distribution at the position of the foundation pit, and prefabricating a corresponding reinforced concrete porous spiral tubular pile;
(2) the drilling machine is in place and drills the prefabricated pipe piles into the well-arranged point positions in sequence, the drilling speed of the pipe piles is 1-4 r/min when aiming at different soil conditions, for example, the drilling speed is 1-2 r/min on a sand layer and 2-4 r/min on a clay layer;
(3) arranging a power supply system and a pumping system, connecting the anode pipe piles with the positive pole of a power supply, connecting the cathode pipe piles with the negative pole of an electrode, installing submersible pumps in the pipe piles and arranging pumping pipelines to determine the safety of the power supply system and the smoothness of the pumping system;
(4) switching on a power supply to perform electroosmosis drainage, and then starting different submersible pumps to pump water to each tubular pile, particularly to a cathode tubular pile with a higher water level under the electroosmosis action, wherein the higher submersible pump power and the longer water pumping time are adopted;
(5) after the electroosmosis drainage is carried out for a period of time, the power is cut off and the electrode is reversed, then the power supply is switched on again for electroosmosis drainage, and the process is repeated for many times to ensure that the underground water level of the foundation pit is uniformly distributed;
(6) after the electroosmosis drainage is powered off and the water pumping is stopped, the tubular pile can reinforce soil around the pile, play a better role in enclosing foundation pit excavation, and can timely regulate and control the underground water level in the subsequent service process.
The structure of the prefabricated reinforced concrete porous spiral pipe pile is shown in fig. 1-3, and specifically comprises the following steps:
the pipe pile wall is laid with the multirow round hole along the long direction of stake, and the lower part sets up the screw thread recess in the pipe pile wall, closely wraps up carbon cloth and fixes at the tubular pile outer wall, inlays the external screw thread in the carbon cloth outside of screw thread recess department.
Specifically, the porous structure of the tubular pile is as follows:
the porous structure of the tubular pile enables pore water of surrounding strata and electroosmosis cathode drainage to be collected and enter the tubular pile and then be pumped by a water suction pump. In the upper half part of the pipe pile, in a non-threaded area, multiple rows of round holes are uniformly formed in the wall of the pipe pile along the length direction of the pipe pile, the distance between every two adjacent rows is 5-10 times the diameter of the round holes, and 4 round holes are uniformly distributed in each row; in the threaded area of the lower half part of the tubular pile, round holes are formed in the wall of the tubular pile every other quarter of the circumference in the same direction as the thread angle, and the round holes are located between two adjacent layers of threads and do not overlap with the threads.
Specifically, the spiral structure of the tubular pile is as follows:
the reinforced concrete porous spiral pipe pile is similar to a screw in shape, needs to be screwed into the ground during construction, and compared with a driving-in type pile foundation, the interference of the construction process to the periphery is small, the construction period is short, and in addition, the compression resistance and the anti-pulling capacity of the reinforced concrete porous spiral pipe pile are higher than those of the driving-in type pile foundation with the same size, so that concrete materials can be saved to a certain extent, and the grade of concrete can be reduced. The thread structure comprises a groove arranged on the pile wall and an external thread capable of being embedded into the groove, the thread structure is distributed in the range from the tip end to 40% of the length of the pipe pile upwards, and the thread angle is set to be 30-45 degrees; the protruding part of the external thread relative to the pipe wall is preferably 9% -11% of the diameter of the pile body, and the pitch of the external thread is consistent with the distance between two adjacent rows of the round holes and does not shield the round holes. The spiral structure needs to comprehensively consider the close contact between the carbon fiber cloth and the tubular pile and the carbon fiber cloth and the soil body and the damage to the original structure of the carbon fiber cloth caused by excessive resistance in the process of screwing the tubular pile into the soil body.
The carbon fiber cloth has the common effects on the pile, the soil around the pile and a water pumping system under the action of electroosmosis:
the carbon fiber cloth has higher strength and flexibility, and the contact area between the pile body externally wrapped with the carbon fiber cloth and the soil body around the pile is obviously increased, so that the compression resistance and the pulling resistance are further improved; in addition, the restraining effect of the carbon fiber cloth on the pile body enables the transverse deformation resistance of the pile to be obviously improved, and the restraining effect enables the pile body to keep good overall shape and bearing capacity even if the pile body is broken and broken at individual parts; the carbon fiber cloth is wrapped outside the pile body to play a role in conducting electricity, filtering soil and draining water, so that an electroosmosis method can be applied, and water flowing into the tubular pile does not contain large-particle substances any more, so that the holes of the tubular pile, the inner wall of the tubular pile and the bottom of the tubular pile are not seriously clogged; under the condition of slight silting, the effect of removing the silting can be achieved by introducing reverse water flow into the pipe pile, and the normal operation of a drainage system is finally ensured.
The carbon fiber cloth has good conductivity and high strength, can keep close contact with a soil body in an electroosmosis process and is not easy to corrode in the traditional metal electrode material, so that the carbon fiber cloth has superior durability and economical efficiency in electroosmosis. The tubular pile wrapped with the carbon fiber cloth can promote the cathode electroosmosis drainage effect and the soil body reinforcing effect around the anode by reducing the water level in the tubular pile through a water pumping and water reducing method, and meanwhile, the electroosmosis can accelerate the flow convergence of water in the cathode tubular pile and improve the water pumping efficiency, and the two can supplement each other and promote each other.
Specifically, the arrangement form of the pipe piles is as follows:
the tubular piles of the cathode and the anode are arranged in a staggered way, so that the electroosmosis drainage water flow direction is not repelled to block the smooth drainage; the enclosure corner posts should use cathodes to collect and extract more electroosmotic drainage as shown in figure 4. The electrode is reversed after the water is drained by the electroosmosis in one stage, and the electroosmosis is continued after the positions of the cathode and the anode are exchanged, so that the reinforcing effect of the tubular pile on the surrounding soil body tends to be uniform, the underground water level distribution of the foundation pit tends to be uniform, and the tubular pile is favorable for dredging a drainage channel and is beneficial to efficiently draining more water.
The above description is only for the purpose of illustrating the preferred embodiments of the one or more embodiments of the present disclosure, and is not intended to limit the scope of the one or more embodiments of the present disclosure, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the one or more embodiments of the present disclosure should be included in the scope of the one or more embodiments of the present disclosure.
Claims (10)
1. A foundation pit dewatering and enclosing method for a carbon fiber cloth reinforced concrete porous spiral pipe pile is characterized by comprising the following steps:
(1) determining the point position and the model of the tubular pile according to the size of the foundation pit and the underground water level distribution at the position of the foundation pit, and prefabricating a corresponding reinforced concrete porous spiral tubular pile; the structure of precast tubular pile does: a plurality of rows of round holes are distributed on the wall of the tubular pile along the length direction of the tubular pile, a threaded groove is formed in the middle lower part of the wall of the tubular pile, the carbon fiber cloth is tightly wrapped and fixed on the outer wall of the tubular pile, and external threads are embedded in the outer side of the carbon fiber cloth at the threaded groove;
(2) a drilling machine is in place and drills the precast tubular piles into the well-arranged point positions in sequence;
(3) arranging a power supply system and a pumping system, connecting the anode pipe piles with the positive pole of a power supply, connecting the cathode pipe piles with the negative pole of an electrode, installing submersible pumps in the pipe piles and arranging pumping pipelines to determine the safety of the power supply system and the smoothness of the pumping system;
(4) switching on a power supply to perform electroosmotic drainage, and then starting different submersible pumps to pump water for each tubular pile;
(5) after electroosmosis drainage is carried out for a period of time, the power is cut off and the electrode is reversed, then the power supply is switched on again for electroosmosis drainage, and the process is repeated for many times to ensure that the underground water level of the foundation pit is uniformly distributed;
(6) after the electroosmosis drainage is powered off and the water pumping is stopped, the tubular pile can reinforce soil around the pile, play a better role in enclosing foundation pit excavation, and can timely regulate and control the underground water level in the subsequent service process.
2. The foundation pit dewatering and retaining method for the carbon fiber cloth reinforced concrete porous spiral pipe pile according to claim 1, wherein in the step (2), the drilling speed of the pipe pile is 1-4 r/min under different soil conditions.
3. The foundation pit dewatering and retaining method for the carbon fiber cloth reinforced concrete porous spiral pipe pile according to claim 1, wherein in the step (4), a higher submersible pump power and a longer pumping time are adopted for a cathode pipe pile with a higher water level under the electroosmosis action.
4. The foundation pit dewatering and retaining method for the carbon fiber cloth reinforced concrete porous spiral pipe pile according to claim 1, characterized in that multiple rows of round holes are uniformly formed in the upper half part of the pipe pile in a thread-free area, the wall of the pipe pile is provided with multiple rows of round holes along the length direction of the pile, the distance between every two adjacent rows of round holes is 5-10 times the diameter of the round holes, and 4 round holes are uniformly arranged in each row.
5. The method as claimed in claim 1, wherein a circular hole is formed in the threaded area of the lower half portion of the tubular pile wall every quarter of the circumference in the same direction as the thread angle, and the circular hole is located between two adjacent layers of threads and does not overlap with the threads.
6. The foundation pit dewatering and retaining method for the carbon fiber cloth reinforced concrete porous spiral pipe pile according to claim 1, wherein the porous structure of the pipe pile enables pore water existing in the surrounding stratum and electroosmosis cathode drainage water to be collected and enter the pipe pile and then be pumped by a water pump.
7. The foundation pit dewatering and retaining method for the carbon fiber cloth reinforced concrete porous spiral pipe pile according to claim 1, characterized in that the spiral groove and the external threads form a spiral structure of the pipe pile, the spiral structure is distributed in the range from the tip end of the pipe pile to 40% of the length of the pipe pile upwards, and the thread angle is set to be 30-45 degrees; the protruding part of the external thread relative to the pipe wall is preferably 9% -11% of the diameter of the pile body, and the pitch of the external thread is consistent with the distance between two adjacent rows of the round holes and does not shield the round holes.
8. The method as claimed in claim 1, wherein the helical structure of the tubular pile is designed to take into account the close contact between the carbon fiber cloth and the tubular pile, the close contact between the carbon fiber cloth and the soil mass, and the tubular pile screwed into the soil mass without damaging the original structure of the carbon fiber cloth by excessive resistance.
9. The foundation pit dewatering and enclosing method for the carbon fiber cloth reinforced concrete porous spiral pipe pile according to claim 1, characterized in that the arrangement of the cathode and anode pipe piles is not such that the electroosmotic drainage water flow direction repels and blocks the drainage smoothness, and the cathodes and the anodes can be arranged in a staggered manner; the corner tubular piles of the building enclosure should adopt cathodes so as to gather and extract more electroosmotic drainage.
10. The foundation pit dewatering and retaining method for the carbon fiber cloth reinforced concrete porous spiral tubular pile, as recited in claim 1, characterized in that the electrodes are reversed after one-step electroosmosis drainage, and electroosmosis is continued after the exchange of the cathode and anode positions, so that the reinforcement effect of the tubular pile on the surrounding soil tends to be uniform, the distribution of the underground water level of the foundation pit tends to be uniform, and more water can be discharged efficiently.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116069071A (en) * | 2023-03-24 | 2023-05-05 | 冠鲁建设股份有限公司 | Construction optimization system, method, device and medium based on big data |
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| CN112482454A (en) * | 2020-11-24 | 2021-03-12 | 河海大学 | Deviation rectifying construction method for building or structure by using bionic principle |
| CN113123322A (en) * | 2021-04-12 | 2021-07-16 | 宁波大学 | Construction method of vertical electroosmosis pile system |
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Application publication date: 20211109 |