CN214784243U - Back-inserted unbonded steel strand U-shaped pipe pressure-bearing uplift pile - Google Patents
Back-inserted unbonded steel strand U-shaped pipe pressure-bearing uplift pile Download PDFInfo
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Abstract
The application relates to a pressure-bearing uplift pile with a rear-inserted unbonded steel strand U-shaped pipe. The uplift pile construction adopts a pile forming process of drilling holes by a drilling machine and pouring concrete, before the concrete of the pile body is initially set, a hammer pipe is adopted to insert the unbonded steel stranded wire and U-shaped pipe pressure-bearing member combination body into a specified elevation position in the concrete pile body, and finally the unbonded steel stranded wire is tensioned and locked at the top of the pile, in the foundation or on the upper part of the foundation through an anchor plate and an anchorage device. The method has the advantages that the post-inserting process is adopted, the construction speed is high, the U-shaped pipe pressure-bearing member is simple and convenient to install, the lower end part does not need to be provided with an anchor head anchorage device, the construction quality is good, and the uplift resistance bearing capacity of the pile body is high. Compared with the common uplift pile, the pile body crack problem does not need to be considered, the consumption of main materials is less, and the manufacturing cost is low; compare with anti-floating anchor rod, this application pile shaft material adopts the concrete, and is more reliable than grout or the mortar quality that anti-floating anchor rod adopted, and main material protective layer thickness is big, and the bearing capacity is higher, and the durability is better.
Description
Technical Field
The application relates to an anti-floating and anti-pulling member for buildings, municipal works, underground works and high-rise structures in construction engineering, in particular to an unbonded steel strand U-shaped pipe pressure-bearing type anti-pulling pile.
Background
In recent years, with the development of national economy, city construction is changed day by day, high-rise and super high-rise buildings are increasingly developed, foundations are more deeply buried, and meanwhile, development and utilization of pure underground chamber parts, skirt houses or relatively independent underground structures (such as sinking squares, underground garages, underground structures and the like) of matched buildings are more and more extensive. Because there is a large amount of groundwater in the gap of the underground soil body and the crack of the rock mass, or the surface water of the construction process gets into the underground space, the groundwater or the surface water can produce buoyancy to the underground structure, if the dead weight of the structure is less than the buoyancy, the structure will be arched or floated up and destroyed, and the normal use of the structure is affected. The anti-floating problem of the underground structure is a common problem in engineering, the current measures for solving the anti-floating problem of the underground structure mainly comprise methods such as pressing, pulling and releasing, the pressing mainly adopts methods such as increasing the weight of a building and adding a balance weight, and is mostly used for the condition that the anti-floating requirement is not very high, and the anti-floating problem is solved through structural measures; the pulling method is mainly characterized in that uplift members such as uplift piles or uplift anchor rods are arranged in the foundation to balance buoyancy generated by water, the method is most applied in engineering, and the problems of uplift and uplift of complex engineering can be solved. The 'discharging' mainly solves the anti-floating problem by a method of releasing water buoyancy, such as a method of water drainage pressure limiting or water drainage pressure reduction, and the method has relatively few engineering applications because the equipment needs long-term operation control and maintenance management. In addition, when some high-rise structures or buildings with special functions are subjected to large horizontal loads or earthquake loads, the foundation has a uplift problem, and uplift members such as uplift piles or anti-floating anchor rods are generally adopted.
The method is the most common method for solving the problems of foundation anti-floating and foundation anti-pulling by arranging anti-pulling components such as anti-pulling piles or anti-floating anchor rods. However, when a common uplift pile and an anti-floating anchor rod are in a working state, pile body concrete or grouting body is in a tension state, and because the tensile strength of the concrete or grouting body is low, the pile body concrete or grouting body is easy to crack when being tensioned, and a stressed steel bar or steel strand protective layer is small and is easy to be corroded and corroded by underground water, the bearing capacity of the tensioned steel bar or steel strand is reduced, and the stressed steel bar or steel strand can be pulled apart to cause the anti-floating member to fail in serious cases. The common uplift pile or anti-floating anchor rod is generally designed according to the width of a control crack, and has the defects of low bearing capacity, high reinforcement rate, high cost and the like. The pressure bearing type anti-floating anchor rod is adopted, the area of the pressure bearing plate is small, the strength of anchor rod grouting body is low, the pressure provided by the pressure bearing plate is small, and the situation that the bearing capacity cannot meet the design requirement easily occurs.
Aiming at the problems and defects of the conventional uplift pile and the conventional anti-floating anchor rod, the development of a novel uplift pile which has the advantages of convenience in construction, high efficiency, environmental protection, high construction speed, simplicity and convenience in construction operation, wide applicable stratum, high uplift bearing capacity, full exertion of strength of steel bars and steel strands, capability of applying prestress and the like is urgently needed.
SUMMERY OF THE UTILITY MODEL
The application provides a back is inserted unbonded steel strand wires U type pipe pressure-bearing type uplift pile can overcome technical problem such as current ordinary uplift pile bearing capacity is low, arrangement of reinforcement rate height, also can overcome simultaneously and have cohesiveness anti-floating anchor rod because the diameter leads to the technical problem such as the protective layer is not enough, the difficult assurance of slip casting body intensity for a short time. At present, in the related industries of building engineering, municipal engineering, underground engineering and the like, a construction process for inserting non-adhesive steel strands and other flexible materials into a concrete cast-in-place pile and the like is not available, and meanwhile, a related technology for adopting a U-shaped pipe as a pressure-bearing member of an uplift pile is also not available.
In order to achieve the purpose, the following technical scheme is adopted in the application:
a non-adhesive steel strand U-shaped pipe pressure-bearing uplift pile is characterized in that a long spiral drilling machine is adopted to form holes and press concrete to form a concrete pile body in a soil body, equipment such as a rotary drilling machine and the like is adopted to form holes and pour concrete to form the concrete pile body in a rock body or a place difficult to drill, the non-adhesive steel strand and U-shaped pipe pressure-bearing member combination is inserted into a specified elevation position in the concrete pile body through a hammer pipe before concrete is initially set, and after the concrete strength grade of the pile body reaches the design requirement, the non-adhesive steel strand is tensioned and locked at the top of the pile, the inside of the foundation or the upper part of the foundation through an anchor plate and an anchorage device.
The construction of the pressure-bearing uplift pile with the U-shaped pipe inserted with the unbonded steel stranded wire at the back adopts a construction process of combining the drilling machine for forming a hole and pouring concrete pile, and then inserting the unbonded steel stranded wire and the pressure-bearing member of the U-shaped pipe.
The U-shaped pipe bearing member is rigid, and is combined with the unbonded steel stranded wires to form a stressed reinforcement assembly of the uplift pile, and the unbonded steel stranded wires and the U-shaped pipe bearing member assembly are inserted into a specified elevation position in a concrete pile body through a vibrating or pressurizing hammer pipe.
The manufacturing methods of the U-shaped pipe pressure-bearing member comprise the following steps:
(1) the method comprises the following steps that an unbonded steel strand penetrates through a straight pipe with a designed length in advance, and then the straight pipe is extruded and bent by a pipe bender to form a U-shaped pipe pressure-bearing member;
(2) directly penetrating the unbonded steel strand through the formed U-shaped pipe by using a pipe penetrating machine to form a U-shaped pipe pressure-bearing member;
(3) directly penetrating the unbonded steel stranded wire through the two formed arc pipes by using a pipe penetrating machine, and then forming a U-shaped pipe pressure-bearing member by the two formed arc pipes through a connecting piece;
the U-shaped pipe of the U-shaped pipe pressure-bearing member is made of steel pipes, galvanized pipes, welded pipes, aluminum pipes, high polymer materials and the like, the wall thickness is 2.5-20 mm, and the outer diameter is 25-100 mm; the total length of the U-shaped pipe and the vertical riser distance of the U-shaped pipe are determined according to the pulling resistance.
The U-shaped pipe pressure-bearing member directly adopts a U-shaped pipe or a combined body formed by welding the U-shaped pipe with a steel bar, a steel pipe, a steel plate, profile steel and the like as the pressure-bearing member.
The positioning guide device is arranged on the hammer pipe and can adopt steel bars, steel pipes, steel plates, profile steel and the like.
The positioning and fixing clamp is arranged on the hammer pipe or the U-shaped pipe pressure-bearing member, the specific arrangement position is determined according to the length of the unbonded steel stranded wire, and the main purpose is to temporarily fix the assembly of the unbonded steel stranded wire and the U-shaped pipe pressure-bearing member on the hammer pipe during construction.
The diameter of the concrete pile body is equal along the length direction, the concrete strength grade is C25-C50, the concrete slump is 120-240 mm, and the pile forming diameter is 250-1000 mm.
The thickness of the protective layer at the end part of the U-shaped pipe pressure-bearing member is not less than 10 cm.
The unbonded steel strand and U-shaped pipe pressure-bearing member combination is arranged in one or more groups at different depths and different angles in the concrete pile body. When a plurality of groups of unbonded steel stranded wires and U-shaped pipe pressure-bearing member assemblies are arranged in the concrete pile body, the hammer pipe can be adopted to insert the single assemblies into the specified elevation positions in the concrete pile body in sequence, and the hammer pipe can also be adopted to insert the plurality of assemblies into the specified elevation positions in the concrete pile body at one time.
After the unbonded steel stranded wire and U-shaped pipe pressure-bearing member combination is in place in the concrete pile body, the unbonded steel stranded wire exposed out of the pile top is fixed on a straightening clamp, and a crane or a drilling machine is adopted to straighten the unbonded steel stranded wire in the concrete pile body.
The non-adhesive steel strand tensioning and locking method comprises three tensioning and locking methods, wherein the first tensioning and locking method is to arrange a steel split heads in a foundation, apply prestress to tension and lock the non-adhesive steel strand on the steel split heads, and then pour the steel split heads in foundation concrete; the second tension locking mode is that prestress is applied to stretch and lock the unbonded steel strand at the upper part of the foundation; the third tension locking mode is to apply prestress to tension and lock the unbonded steel strand at the top of the uplift pile, arrange an extrusion anchor, a knurling anchor or an anchorage at the upper end of the steel strand and then pour the steel strand in the foundation concrete.
The construction method of the pressure-bearing uplift pile with the back-inserted unbonded steel strand U-shaped pipe comprises the following construction steps:
the method comprises the following steps: processing a combination of the unbonded steel strand and the U-shaped pipe pressure-bearing member;
step two: adopting a drilling machine to form a hole and pour concrete to form a concrete pile body;
step three: removing pile waste soil at an orifice before initial setting of concrete after the concrete pouring of a pile body is finished, exposing a concrete surface at a pile position, positioning a non-bonding steel strand and U-shaped pipe pressure-bearing member combination in the middle of the concrete pile position through a hammer pipe, and inserting the non-bonding steel strand and U-shaped pipe pressure-bearing member combination into the concrete pile body to designate a designed elevation;
step four: straightening the unbonded steel strand in the concrete pile body;
step five: and applying prestress to the unbonded steel strand, tensioning and locking the unbonded steel strand at the top of the pile, in the foundation or on the upper part of the foundation.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the unbonded steel strand U-shaped pipe pressure-bearing uplift pile is preferably constructed by long auger drilling and concrete pressure-pouring (construction of equipment such as a rotary drilling rig and the like is adopted in special cases), and the assembly of the unbonded steel strand and the U-shaped pipe pressure-bearing member is assembled by adopting a rear-inserting process, so that the method is free of slurry pollution, environment-friendly, efficient, stable in construction quality, high in construction speed and simple and convenient to operate;
the U-shaped pipe is convenient to construct, has good fit with the steel strand, can provide enough pressure in the concrete, saves materials compared with other pressure-bearing members, is reliable in quality, convenient to machine, small in cross-sectional area, convenient to construct and easy to insert into a designated position in a pile body.
3. The uplift pile is of a pressure-bearing type and can apply prestress according to needs, and unbonded steel strands are adopted;
4. the uplift pile adopts unbonded steel stranded wires, is pressure-bearing, can save a large amount of steel compared with the common uplift pile, and has better cost performance than the common uplift pile;
5. the uplift pile adopts unbonded steel stranded wires which are protected by an outer protective sleeve and are pressure-bearing, so that a pile body crack cannot be generated, and the unbonded steel stranded wires have enough concrete protective layer thickness and cannot be corroded by a corrosive medium in a foundation, so that the durability in the service life of the uplift pile meets the requirement;
6. compared with the anti-floating anchor rod, the anti-floating anchor rod has the advantages of low construction cost, large cross-sectional area of the pile, capability of adopting concrete materials with strength and quality superior to cement paste and mortar, large thickness of the reinforcement protective layer, good durability and high bearing capacity.
Drawings
FIG. 1 is a schematic structural view of a U-shaped pipe pressure-bearing member;
FIG. 2 is a schematic structural view of a U-shaped pipe pressure-bearing member with additional members;
(a) welding an additional member in the middle of the U-shaped pipe pressure-bearing member; (b) welding an additional steel plate on the U-shaped pipe pressure-bearing member; (c) a spiral stirrup is arranged in the middle of the U-shaped pipe pressure-bearing member;
FIG. 3 is a construction position relation diagram of the pressure bearing member of the hammer pipe and the U-shaped pipe and the unbonded steel strand;
FIG. 4 is a schematic cross-sectional view of the uplift pile with unbonded steel strands locked on the upper part of the foundation (single assembly);
FIG. 5 is a schematic cross-sectional view (a plurality of combinations) of the uplift pile with unbonded steel strands locked on the upper part of the foundation;
fig. 6 is a schematic cross-sectional view (single assembly) of the uplift pile with unbonded steel strands locked inside the foundation;
fig. 7 is a schematic cross-sectional view (a plurality of combinations) of the unbonded steel strands locked in the uplift pile inside the foundation;
fig. 8 is a schematic cross-sectional view (single assembly) of unbonded steel strands locked to the uplift pile top and the pile top penetrating into the foundation bedplate;
fig. 9 is a schematic cross-sectional view (of multiple assemblies) of unbonded steel strands locked to the uplift pile top and the pile top penetrating into the foundation bedplate.
Description of reference numerals: 1-concrete pile body, 2-unbonded steel strand, 3-U-shaped pipe pressure-bearing member, 4-vibration or pressurization device, 5-hammer pipe, 6-positioning guide device, 7-positioning fixing clamp, 8-foundation, 9-anchor plate and anchor device, 10-steel stirrup, 11-waterproof cushion layer, 12-extrusion anchor, embossing anchor or anchor device.
Detailed Description
The present application is described in further detail below with reference to figures 1-9.
The embodiment of the application discloses a pressure-bearing uplift pile with a rear-inserted unbonded steel strand U-shaped pipe.
Referring to fig. 1-9, the components included are: the concrete pile comprises a concrete pile body 1, unbonded steel strands 2, a U-shaped pipe pressure-bearing member 3, a vibration or pressurization device 4, a hammer pipe 5, a positioning and guiding device 6, a positioning and fixing clamp 7, a foundation 8, an anchor plate and an anchor device 9, a steel stirrup 10, a waterproof cushion layer 11, an extrusion anchor, an embossing anchor or an anchor device 12.
Referring to fig. 1 and 2, a U-shaped pipe in the U-shaped pipe pressure-bearing member 3 is a steel pipe, a galvanized pipe, a welded pipe, an aluminum pipe, a polymer material, and the like, and has a wall thickness of 2.5 to 20mm and an outer diameter of 25 to 100 mm; the total length of the U-shaped pipe and the vertical riser distance of the U-shaped pipe are determined according to the pulling resistance. The U-shaped pipe pressure-bearing member 3 directly adopts a U-shaped pipe or a combined body formed by welding the U-shaped pipe with a steel bar, a steel pipe, a steel plate, profile steel and the like as a pressure-bearing member. The U-shaped pipe pressure-bearing member 3 is rigid, and is combined with the unbonded steel strand 2 to form a stressed rib assembly of the uplift pile.
The U-shaped pipe pressure-bearing member 3 is manufactured in the following ways:
(1) the unbonded steel stranded wire 2 penetrates through a straight pipe with a designed length in advance, and then the straight pipe is extruded and bent by a pipe bender to form a U-shaped pipe pressure-bearing member 3;
(2) directly penetrating the unbonded steel strand 2 through the formed U-shaped pipe by using a pipe penetrating machine to form a U-shaped pipe pressure-bearing member 3;
(3) directly penetrating the unbonded steel strand 2 through the two formed arc pipes by using a pipe penetrating machine, and then forming a U-shaped pipe pressure-bearing member 3 by the two formed arc pipes through a connecting piece;
referring to fig. 3, a positioning guide 6 is provided on the hammer pipe 5 to prevent the unbonded steel strand 2 and U-shaped pipe bearing member 3 combination from deviating from the center of the concrete pile body 1. The positioning and guiding device 6 is welded and fixed on the hammer pipe 5 by adopting a steel bar, a steel pipe, a steel plate and section steel.
Referring to fig. 3, a positioning and fixing clamp 7 is arranged at the upper part of the hammer pipe 5, and the top of the unbonded steel strand 2 is temporarily clamped and fixed on the hammer pipe 5 through the positioning and fixing clamp 7.
Referring to fig. 3-9, the lower end of the hammer pipe 5 is provided with a clamping groove to clamp the U-shaped pipe pressure-bearing member 3 or the hammer pipe 5 directly penetrates into an additional member (steel bar, steel pipe or steel plate) welded on the U-shaped pipe pressure-bearing member 3, then the upper end of the unbonded steel strand 2 is temporarily fixed on the positioning and fixing clamp 7 on the hammer pipe 5, so that the combined body of the unbonded steel strand 2 and the U-shaped pipe pressure-bearing member 3 is temporarily fixed on the hammer pipe 5, and finally the hammer pipe 5 is driven by the vibration or pressurization device 4 to insert the combined body of the unbonded steel strand 2 and the U-shaped pipe pressure-bearing member 3 into a designated elevation position in the concrete pile body 1.
When the combination of the unbonded steel stranded wires 2 and the U-shaped pipe pressure-bearing member 3 is in place in the concrete pile body 1, the unbonded steel stranded wires 2 exposed out of the pile top are temporarily fixed on a straightening clamp, and a crane or a drilling machine is adopted to straighten the unbonded steel stranded wires 2 in the concrete pile body 1.
Referring to fig. 4-9, a waterproof cushion 11 is provided between the foundation soil and the foundation.
Referring to fig. 4-5, the unbonded steel strand 2 is tension-locked on the upper part of the foundation 8 by the anchor plate and the anchorage device 9.
Referring to fig. 6-7, a steel split heads 10 is arranged in the foundation, after prestress is applied, the unbonded steel stranded wires 2 are tensioned and locked on the steel split heads 10 through anchor plates and anchors 9, and then the steel split heads 10 are poured into concrete of the foundation 8.
Referring to fig. 8-9, after prestress is applied, the unbonded steel strand 2 is tensioned and locked on the top of the uplift pile through the anchor plate and the anchorage device 9, an extrusion anchor, a knurling anchor or an anchorage device 12 is arranged at the end part of the unbonded steel strand 2, and then the unbonded steel strand 2 is poured into concrete of the foundation 8.
Referring to fig. 5, 7 and 9, a plurality of groups of the unbonded steel strand 2 and U-shaped pipe bearing member 3 combination bodies are arranged in the concrete pile body 1 at different depths and different angles. When a plurality of groups of the unbonded steel strand 2 and U-shaped pipe pressure-bearing member 3 combination bodies are arranged in the concrete pile body 1, the hammer pipe 5 can be adopted to insert the single combination bodies into the designated elevation position in the concrete pile body 1 in sequence; also can set up positioning channel according to the concrete position of combination body in concrete pile body 1 in hammer pipe 5 relevant position, then adopt hammer pipe 5 once only with a plurality of combination bodies back insert appointed elevation position in concrete pile body 1.
The embodiment also discloses a construction method of the pressure-bearing uplift pile with the U-shaped pipe inserted with the unbonded steel strand, which comprises the following construction steps:
the method comprises the following steps: processing a combination of the unbonded steel strand 2 and the U-shaped pipe pressure-bearing member 3;
step two: adopting a drilling machine to form holes and pour concrete to form a concrete pile body 1;
step three: after the pile body concrete is poured, removing pile waste soil at an orifice before the concrete is initially set to expose a pile position concrete surface, positioning a combination of the unbonded steel stranded wire 2 and the U-shaped pipe pressure-bearing member 3 in the middle of the concrete pile position through the hammer pipe 5, and inserting the combination of the unbonded steel stranded wire 2 and the U-shaped pipe pressure-bearing member 3 into the concrete pile body 1 at a designated design elevation;
step four: straightening the concrete pile body 1 without the adhesive steel strand 2;
step five: prestress is applied to the unbonded steel strand 2, and then the unbonded steel strand is tensioned and locked at the top of the pile, in the foundation 8 or on the upper part of the foundation 8.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (9)
1. Back is inserted unbonded steel strand wires U type pipe pressure-bearing type uplift pile, its characterized in that: the concrete pile comprises a concrete pile body (1) formed by adopting a drilling machine hole-forming concrete pouring process, and a non-adhesive steel strand (2) and U-shaped pipe pressure-bearing member (3) assembly which is inserted into the specified elevation position in the concrete pile body (1) through a hammer pipe (5) before the initial setting of concrete; and after the strength grade of the pile body concrete reaches the design requirement, the unbonded steel strand (2) is tensioned and locked at the top of the pile, the inside of the foundation (8) or the anchor plate and the anchorage device (9) at the upper part of the foundation (8).
2. The pressure-bearing uplift pile with the back inserted unbonded steel strand U-shaped pipe as claimed in claim 1, wherein: the U-shaped pipe pressure-bearing member (3) is rigid, the U-shaped pipe is made of a steel pipe, a galvanized pipe, a welded pipe, an aluminum pipe and a high polymer material, the wall thickness is 2.5-20 mm, and the outer diameter is 25-100 mm; the total length of the U-shaped pipe and the vertical riser distance of the U-shaped pipe are determined according to the pulling resistance.
3. The pressure-bearing uplift pile with the back inserted unbonded steel strand U-shaped pipe as claimed in claim 1, wherein: the combined body of the unbonded steel stranded wire (2) and the U-shaped pipe pressure-bearing member (3) is formed by enabling the unbonded steel stranded wire (2) to penetrate through the U-shaped pipe pressure-bearing member (3).
4. The pressure-bearing uplift pile with the back inserted unbonded steel strand U-shaped pipe as claimed in claim 1, wherein: the U-shaped pipe pressure-bearing member (3) is a U-shaped pipe directly or welded with a steel bar, a steel pipe, a steel plate and section steel on the basis of the U-shaped pipe to form the U-shaped pipe with the additional member, the U-shaped pipe has a positioning effect and improves pressure-bearing performance.
5. The pressure-bearing uplift pile with the back inserted unbonded steel strand U-shaped pipe as claimed in claim 1, wherein: when the unbonded steel strand wires (2) and the U-shaped pipe bearing member (3) combination body is inserted into the concrete pile body (1) through the hammer pipe (5), the hammer pipe (5) is provided with a positioning fixing clamp (7), the U-shaped pipe at the lower part of the unbonded steel strand wires (2) and the U-shaped pipe bearing member (3) combination body is temporarily fixed at the bottom of the hammer pipe (5), and the top of the unbonded steel strand wires (2) is temporarily clamped and fixed on the hammer pipe (5) through the positioning fixing clamp (7).
6. The pressure-bearing uplift pile with the back inserted unbonded steel strand U-shaped pipe as claimed in claim 1, wherein: when the non-adhesive steel strand (2) and U-shaped pipe bearing member (3) combination is inserted into the concrete pile body (1) through the hammer pipe (5), the hammer pipe (5) is provided with a positioning guide device (6) to prevent the non-adhesive steel strand (2) and U-shaped pipe bearing member (3) combination from deviating from the center of the concrete pile body (1); the positioning guide device (6) is welded and fixed on the hammer pipe (5) by adopting a steel bar, a steel pipe, a steel plate and section steel.
7. The pressure-bearing uplift pile with the back inserted unbonded steel strand U-shaped pipe as claimed in claim 1, wherein: the concrete pile body (1) is equal in diameter along the length direction, the concrete strength grade is C25-C60, the concrete slump is 120-240 mm, and the pile forming diameter is 250-1000 mm.
8. The pressure-bearing uplift pile with the back inserted unbonded steel strand U-shaped pipe as claimed in claim 1, wherein: the thickness of the concrete protective layer of the U-shaped pipe pressure-bearing member (3) at the lower end part of the pile body is not less than 10 cm.
9. The pressure-bearing uplift pile with the back inserted unbonded steel strand U-shaped pipe as claimed in claim 1, wherein: the unbonded steel strand (2) and U-shaped pipe pressure-bearing member (3) combination is arranged in one or more groups at different depths and different angles in the concrete pile body (1).
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| CN202120847446.3U CN214784243U (en) | 2021-04-23 | 2021-04-23 | Back-inserted unbonded steel strand U-shaped pipe pressure-bearing uplift pile |
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| CN113123373A (en) * | 2021-04-23 | 2021-07-16 | 建研地基基础工程有限责任公司 | Pressure-bearing uplift pile with rear-inserted unbonded steel strand U-shaped pipe and construction method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113123373A (en) * | 2021-04-23 | 2021-07-16 | 建研地基基础工程有限责任公司 | Pressure-bearing uplift pile with rear-inserted unbonded steel strand U-shaped pipe and construction method thereof |
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