CN106836211B - Prefabricated club-footed reducing pile for treating soft soil foundation and construction method thereof - Google Patents
Prefabricated club-footed reducing pile for treating soft soil foundation and construction method thereof Download PDFInfo
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- CN106836211B CN106836211B CN201710221108.7A CN201710221108A CN106836211B CN 106836211 B CN106836211 B CN 106836211B CN 201710221108 A CN201710221108 A CN 201710221108A CN 106836211 B CN106836211 B CN 106836211B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/48—Piles varying in construction along their length, i.e. along the body between head and shoe, e.g. made of different materials along their length
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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
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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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- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
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Abstract
The invention relates to a method for processing softA prefabricated bottom-expanding variable-diameter pile of a soil foundation and a construction method thereof are disclosed, wherein the side surface of the prefabricated bottom-expanding variable-diameter pile is wrapped with carbon fiber cloth, and the diameter-expanding position of the prefabricated bottom-expanding variable-diameter pile is
And the diameter reducing part of the prefabricated bottom expanding variable diameter pile is sleeved by a steel sleeve, and two super-strong PVC pipes are inserted into the diameter expanding part of the prefabricated bottom expanding variable diameter pile. The prefabricated club-footed reducing pile is driven into the designed depth for electro-osmosis consolidation, and 0.25 percent of NaCl solution is poured through the super-strong PVC pipe in the electro-osmosis process. By adopting the prefabricated club-footed variable diameter pile and the construction method thereof, the defect of poor pile forming quality of the cast-in-place variable diameter pile can be overcome; the reducing pile is integrally cylindrical, so that the soil resistance borne by the pile can be reduced during pile sinking, and the pile sinking speed is improved; 0.25% NaCl solution is poured through the super-strong PVC pipe in the electroosmosis process, so that the electroosmosis consolidation efficiency can be improved; the prefabricated bottom-expanding variable-diameter pile has the advantages that the pile bottom is expanded, and the pile end is implanted into the bearing layer, so that larger pile end bearing capacity can be provided.
Description
Technical Field
The invention belongs to the field of foundation reinforcement engineering, and particularly relates to a prefabricated club-footed variable diameter pile for treating a soft soil foundation and a construction method thereof, which are suitable for treating the soft soil foundation with high water content by a combined electroosmosis consolidation method.
Background
Soft soil foundations are widely distributed along coasts of large rivers and coastal areas in China, and the soft soil foundations need to be processed in a proper mode according to actual conditions in engineering. Therefore, it is necessary to invent and improve various methods suitable for treating soft soil foundations continuously, so as to further improve the engineering quality and create greater economic benefits. The prefabricated under-reamed reducing pile for treating soft foundation and its construction process are provided for treating high water content soft foundation.
Disclosure of Invention
In order to solve the problems in a targeted manner, the project provides a prefabricated bottom-expanding variable-diameter pile for treating a soft soil foundation and a construction method thereof, and the prefabricated bottom-expanding variable-diameter pile overcomes the defect of poor pile quality of the cast-in-place variable-diameter pile; the steel sleeve is sleeved at the diameter reducing part of the prefabricated club-footed reducing pile, so that the reducing pile is integrally cylindrical, the resistance of a soil body during pile sinking is reduced, and the pile sinking speed is improved; the prefabricated club-footed reducing pile can be filled with 0.25 percent of NaCl solution through the super-strong PVC pipe in the electroosmosis process, so that the electroosmosis consolidation efficiency is improved; the prefabricated bottom-expanding variable-diameter pile has the advantages that the pile bottom is expanded, the pile end is implanted into the bearing layer, and larger pile end bearing capacity can be provided.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
a prefabricated bottom-expanding variable-diameter pile for treating a soft soil foundation is characterized in that the side face of the prefabricated bottom-expanding variable-diameter pile is wrapped with carbon fiber cloth, the diameter expanding position of the prefabricated bottom-expanding variable-diameter pile is composed of a round table, a cylinder and an inverted round table, the shapes of the round table and the inverted round table are completely the same, the diameter of the lower surface of the round table is the same as that of the cylinder, the diameter of the cylinder is 1.5-2 times of that of the diameter reducing position and 0.5-0.8 m thick, the distance between the diameter expanding positions of two adjacent prefabricated bottom-expanding variable-diameter piles is 2-3 m, the diameter of the bottom of the prefabricated bottom-expanding variable-diameter pile is the same as that of the diameter expanding position, the diameter reducing position of the prefabricated bottom-expanding variable-diameter pile is sleeved with a steel sleeve, the steel sleeve is filled with sludge containing 0.25% of NaCl solution, two super-strength PVC pipes are inserted into the diameter expanding position of the prefabricated bottom-expanding variable-diameter pile, and the super strength PVC pipes extend from the top of the prefabricated bottom-expanding variable-diameter pile to the bottom of the prefabricated bottom-expanding variable-diameter pile.
The length of the steel sleeve is slightly longer than the distance between the diameter-expanding positions of the two prefabricated bottom-expanding variable-diameter piles, the diameter of the steel sleeve is slightly larger than the diameter of the diameter-expanding position of the prefabricated bottom-expanding variable-diameter pile, and a rubber gasket is padded at the contact position of the steel sleeve and the prefabricated bottom-expanding variable-diameter pile and is used for sealing and reinforcing.
The diameter of the super-strong PVC pipe is 1/10 of the diameter-expanded part of the prefabricated bottom-expanded reducing pile, and round holes with the diameter of 2-3 cm are uniformly drilled on the side surface of the super-strong PVC pipe.
A construction method of a prefabricated club-footed variable diameter pile for treating soft soil foundations comprises the following steps:
1) processing the prefabricated club-footed reducing pile: processing the prefabricated club-footed reducing pile according to the design requirement, and wrapping the carbon fiber cloth on the side surface of the prefabricated club-footed reducing pile; the reducing position of the prefabricated bottom-expanding variable diameter pile is sleeved by a steel sleeve, a rubber gasket is arranged at the contact position of the steel sleeve and the prefabricated bottom-expanding variable diameter pile, sealing treatment and reinforcing treatment are carried out, silt containing 0.25% NaCl solution is fully filled into the steel sleeve through the super-strong PVC pipe, and the pipe orifice of the super-strong PVC pipe is plugged by a plug.
2) Preparation before construction: clearing the field, paving a mechanical walking track, and mechanically entering the field;
3) implanting a prefabricated club-footed variable diameter pile: and implanting the processed prefabricated club-footed variable diameter pile into a soil body according to the design requirement.
4) And (3) carrying out electroosmotic consolidation: connecting the carbon fiber cloth on the prefabricated expanded-base reducing pile with the positive electrode of a power supply by using a lead as an anode, connecting the circular steel pipe with holes, which is externally coated with gauze, with the negative electrode of the power supply by using a lead as a cathode, performing electroosmosis consolidation, and continuously pumping water generated in the cathode by using a vacuum pump. And simultaneously, 0.25 percent NaCl solution is poured into the super-strong PVC pipe at intervals.
5) And (3) finishing construction: and (3) continuously carrying out electroosmosis reinforcement work, continuously corroding the steel sleeve, continuously keeping pore water in the soft soil foundation away from the prefabricated club-footed variable-diameter pile, continuously self-compacting soil body around the prefabricated club-footed variable-diameter pile until the foundation meets the bearing capacity design requirement, and then carrying out subsequent engineering construction.
The invention has the following characteristics and beneficial effects:
1. the reducing position of the prefabricated bottom-expanding variable diameter pile is sleeved by a steel sleeve, so that the variable diameter pile is integrally cylindrical, the resistance of a soil body during pile sinking is reduced, and the pile sinking speed is increased.
2. The diameter reducing part of the prefabricated bottom expanding variable diameter pile is sleeved by a steel sleeve, the steel sleeve is filled with silt containing 0.25 percent of NaCl solution, and 0.25 percent of NaCl solution is filled through a super-strong PVC pipe along with the proceeding of electroosmosis consolidation, so that the electroosmosis consolidation efficiency can be improved.
3. The prefabricated bottom-expanding variable-diameter pile adopts the pile bottom to carry out expansion treatment, and the pile end is implanted into the bearing layer, so that larger pile end bearing capacity can be provided.
4. The invention overcomes the defect of poor pile forming quality of the cast-in-place variable diameter pile by adopting the prefabricated club-footed variable diameter pile.
Drawings
Fig. 1 is a sectional view of a prefabricated club-footed variable diameter pile for treating soft soil foundation.
Fig. 2 is a sectional view of a prefabricated club-footed variable diameter pile for treating soft soil foundation.
FIG. 3 is a plan view of a system for consolidating soft soil foundation by combining prefabricated club-footed reducing piles and electroosmosis.
The reference numbers in the figures illustrate: 1-a plug; 2-soft soil layer; 3-a rubber gasket; 4-a steel sleeve; 5-sludge containing 0.25% NaCl solution; 6-super PVC pipe; 7-prefabricating the club-footed variable diameter pile; 8-carbon fiber cloth; 9-a support layer; 10-a circular steel pipe with holes and covered with gauze; 11-a drain pipe; 12-a vacuum pump; 13-a wire; 14-power supply.
Detailed Description
In order to make the technical means, the original characteristics, the achieved purposes and the effects of the invention easy to understand, the invention is further described with reference to the figures and the specific embodiments.
The invention is used for the treatment construction of the soft soil foundation with high water content.
Fig. 1 shows a sectional view of the prefabricated club-footed reducing pile for treating soft soil foundation, the diameter reducing part of the prefabricated club-footed reducing pile 7 is sleeved with a steel sleeve 4, a rubber gasket 3 is arranged at the contact part of the steel sleeve 4 and the prefabricated club-footed reducing pile 7 and is sealed and reinforced, a superstrong PVC pipe 6 extends to the bottom of the prefabricated club-footed reducing pile 7 from the pile top of the prefabricated club-footed reducing pile 7, sludge 5 containing 0.25% NaCl solution is fully poured into the steel sleeve 4 through the superstrong PVC pipe 6, the prefabricated club-footed reducing pile 7 is integrally cylindrical, and a holding layer 9 is implanted at the pile end. Fig. 2 is a sectional view of the prefabricated club-footed variable diameter pile for treating soft soil foundation.
Fig. 3 is a plan view of the system for reinforcing the soft soil foundation by combining the prefabricated club-footed reducing piles for soft soil foundation with electroosmosis, wherein the prefabricated club-footed reducing piles 7 for soft soil foundation are connected with the positive pole of a power supply 14 through leads 13 and are used as the positive pole; the round steel pipe 10 with holes covered with gauze is connected with the negative pole of a power supply 14 through a lead 13 to be used as a cathode for electroosmosis consolidation, and water generated by the cathode in the electroosmosis process is pumped out through a vacuum pump 12.
During the specific construction, the following construction steps are adopted:
1) processing the prefabricated club-footed reducing pile: processing the prefabricated club-footed reducing pile 7 according to the design requirement, and wrapping the carbon fiber cloth 8 on the side surface of the prefabricated club-footed reducing pile 7; the reducing position of the prefabricated bottom-expanding variable diameter pile 7 is sleeved with a steel sleeve 4, a rubber gasket 3 is arranged on the contact position of the steel sleeve 4 and the prefabricated bottom-expanding variable diameter pile 7, sealing treatment and reinforcing treatment are carried out, sludge 5 containing 0.25% of NaCl solution is fully filled into the steel sleeve 4 through the super-strong PVC pipe 6, and the opening of the super-strong PVC pipe 6 is plugged with a plug 1.
2) Preparation before construction: clearing the field, paving a mechanical walking track, and mechanically entering the field;
3) implanting a prefabricated club-footed variable diameter pile: and implanting the processed prefabricated club-footed variable diameter pile 7 into a soil body according to the design requirement.
4) And (3) carrying out electroosmotic consolidation: the carbon fiber cloth 8 on the prefabricated bottom-expanding variable diameter pile 7 is connected with the positive pole of a power supply 14 by a lead 13 to be used as an anode, the round steel pipe 10 with holes and coated with gauze is connected with the negative pole of the power supply 14 by the lead 13 to be used as a cathode for electroosmosis consolidation, and a vacuum pump 12 continuously pumps out water generated in the cathode. At the same time, 0.25% NaCl solution is poured into the super-strong PVC pipe 6 at intervals.
5) And (3) finishing construction: and (3) continuously carrying out electroosmosis reinforcement work, continuously corroding the steel sleeve 4, continuously keeping pore water in the soft soil foundation away from the prefabricated club-footed variable-diameter pile 7, continuously self-compacting the soil body around the prefabricated club-footed variable-diameter pile 7 until the foundation meets the bearing capacity design requirement, and then carrying out subsequent engineering construction.
Claims (3)
1. A construction method of a prefabricated club-footed reducing pile for treating soft soil foundations is characterized by comprising the following steps:
1) processing the prefabricated club-footed reducing pile: processing the prefabricated club-footed reducing pile (7) according to the design requirement, and wrapping the carbon fiber cloth (8) on the side surface of the prefabricated club-footed reducing pile (7); sleeving a reducing part of the prefabricated bottom-expanding variable-diameter pile (7) by using a steel sleeve (4), padding a rubber gasket (3) at a contact part of the steel sleeve (4) and the prefabricated bottom-expanding variable-diameter pile (7), sealing and reinforcing, filling silt (5) containing 0.25% of NaCl solution into the steel sleeve (4) through the super-strong PVC pipe (6), and plugging the pipe orifice of the super-strong PVC pipe (6) by using a plug (1);
2) preparation before construction: clearing the field, paving a mechanical walking track, and mechanically entering the field;
3) implanting a prefabricated club-footed variable diameter pile: implanting the processed prefabricated club-footed variable diameter pile (7) into a soil body according to the design requirement;
4) and (3) carrying out electroosmotic consolidation: connecting carbon fiber cloth (8) on a prefabricated expanded-base reducing pile (7) with a lead (13) and the positive electrode of a power supply (14) to be used as an anode, connecting a gauze-coated circular steel pipe (10) with holes with a lead (13) and the negative electrode of the power supply (14) to be used as a cathode, performing electroosmosis consolidation, continuously pumping water generated in the cathode out by a vacuum pump (12), and simultaneously pouring 0.25% NaCl solution into the super-strong PVC pipe (6) at intervals;
5) and (3) finishing construction: continuously carrying out electroosmosis reinforcement work, continuously corroding the steel sleeve (4), continuously keeping pore water in the soft soil foundation away from the prefabricated club-footed variable-diameter pile (7), continuously compacting soil mass around the prefabricated club-footed variable-diameter pile (7) until the foundation meets the design requirement of bearing capacity, and then carrying out subsequent engineering construction;
the side surface of the prefabricated bottom-expanding variable diameter pile (7) is wrapped with carbon fiber cloth (8), the expanding position of the prefabricated bottom-expanding variable diameter pile (7) sequentially consists of a circular table, a cylinder and an inverted circular table from top to bottom, the shapes of the circular table and the inverted circular table are completely the same, the diameter of the lower surface of the circular truncated cone is the same as that of the cylinder, the diameter of the cylinder is 1.5-2 times of the diameter reducing part, the thickness of the cylinder is 0.5-0.8 m, the distance between the diameter expanding parts of two adjacent prefabricated bottom expanding variable-diameter piles (7) is 2-3 m, the diameter of the bottom of each prefabricated bottom expanding variable-diameter pile (7) is the same as that of the diameter expanding part, the diameter reducing parts of the prefabricated bottom expanding variable-diameter piles (7) are sleeved with steel sleeves (4), sludge (5) containing 0.25% of NaCl solution is filled in the steel sleeves (4), two super-strong PVC pipes (6) are inserted into the diameter expanding parts of the prefabricated bottom expanding variable-diameter piles (7), and the super-strong PVC pipes (6) extend to the bottoms of the prefabricated bottom expanding variable-diameter piles (7) from the tops of the prefabricated bottom expanding variable-diameter piles (7).
2. The construction method of the prefabricated club-footed variable diameter pile for treating the soft soil foundation according to claim 1, characterized in that: the length of the steel sleeve (4) is slightly longer than the distance between the diameter-expanding positions of the two prefabricated bottom-expanding variable-diameter piles (7), the diameter of the steel sleeve is slightly larger than the diameter of the diameter-expanding position of the prefabricated bottom-expanding variable-diameter pile (7), a rubber gasket (3) is filled at the contact position of the steel sleeve (4) and the prefabricated bottom-expanding variable-diameter pile (7), and sealing and reinforcing treatment are carried out.
3. The construction method of the prefabricated club-footed variable diameter pile for treating the soft soil foundation according to claim 1, characterized in that: the diameter of the superstrong PVC pipe (6) is 1/10 of the diameter-expanded part of the prefabricated bottom-expanded reducing pile (7), and round holes with the diameter of 2-3 cm are uniformly drilled on the side surface of the superstrong PVC pipe (6).
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| CN201710221108.7A CN106836211B (en) | 2017-04-06 | 2017-04-06 | Prefabricated club-footed reducing pile for treating soft soil foundation and construction method thereof |
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| CN201710221108.7A CN106836211B (en) | 2017-04-06 | 2017-04-06 | Prefabricated club-footed reducing pile for treating soft soil foundation and construction method thereof |
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| CN113622441A (en) * | 2021-08-30 | 2021-11-09 | 长业建设集团有限公司 | Foundation pit dewatering and enclosure method for carbon fiber cloth reinforced concrete porous spiral pipe pile |
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| GB2364728B (en) * | 1998-05-16 | 2002-12-04 | Duncan Cuthill | Method of and apparatus for installing a pile underwater to create a mooring anchorage |
| JP3661753B2 (en) * | 1999-03-01 | 2005-06-22 | 株式会社大林組 | Seismic isolation structure of piles and ready-made piles used therefor |
| CN102162239B (en) * | 2011-04-02 | 2013-05-15 | 河海大学 | Soft soil foundation treated by chemical-solution-combined injection electroosmosis method and construction method of soft soil foundation |
| CN203741818U (en) * | 2014-02-27 | 2014-07-30 | 安徽省公路桥梁工程有限公司 | Drainage type prefabricated tubular pile structure with supporting disc |
| CN105297704B (en) * | 2015-11-05 | 2017-03-29 | 浙江大学城市学院 | A kind of electric osmose strengthens stake reinforcing flexible foundation device and construction method |
| CN106120715B (en) * | 2016-08-22 | 2017-12-19 | 浙江大学城市学院 | A kind of fold stake and its construction method |
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