CN114370051A - Post-tensioned unbonded supporting pile capable of repeatedly utilizing prestressed reinforcement - Google Patents

Post-tensioned unbonded supporting pile capable of repeatedly utilizing prestressed reinforcement Download PDF

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Publication number
CN114370051A
CN114370051A CN202111585122.8A CN202111585122A CN114370051A CN 114370051 A CN114370051 A CN 114370051A CN 202111585122 A CN202111585122 A CN 202111585122A CN 114370051 A CN114370051 A CN 114370051A
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CN
China
Prior art keywords
pile
finish
steel bar
prestressed
rolled
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Pending
Application number
CN202111585122.8A
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Chinese (zh)
Inventor
田安国
鲁欣
霍永业
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Jiangsu Ocean University
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Jiangsu Ocean University
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Publication date
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Priority to CN202111585122.8A priority Critical patent/CN114370051A/en
Publication of CN114370051A publication Critical patent/CN114370051A/en
Pending legal-status Critical Current

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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
    • E02D5/58—Prestressed concrete piles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/04—Producing shaped prefabricated articles from the material by tamping or ramming
    • B28B1/045—Producing shaped prefabricated articles from the material by tamping or ramming combined with vibrating or jolting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/08—Producing shaped prefabricated articles from the material by vibrating or jolting
    • B28B1/093—Producing shaped prefabricated articles from the material by vibrating or jolting by means directly acting on the material, e.g. by cores wholly or partly immersed in the material or elements acting on the upper surface of the material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
    • B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
    • B28B23/04—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members the elements being stressed
    • B28B23/043—Wire anchoring or tensioning means for the reinforcements
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00—Excavations; Bordering of excavations; Making embankments
    • E02D17/02—Foundation pits
    • E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
    • 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
    • E02D5/24—Prefabricated piles
    • E02D5/30—Prefabricated piles made of concrete or reinforced concrete or made of steel and concrete
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2250/00—Production methods
    • E02D2250/0023—Cast, i.e. in situ or in a mold or other formwork
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2250/00—Production methods
    • E02D2250/0046—Production methods using prestressing techniques
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2300/00—Materials
    • E02D2300/0004—Synthetics
    • E02D2300/0018—Cement used as binder
    • E02D2300/002—Concrete
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2300/00—Materials
    • E02D2300/0026—Metals
    • E02D2300/0029—Steel; Iron

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Piles And Underground Anchors (AREA)

Abstract

The utility model provides a back-tension does not have bonding reuse prestressed steel's fender pile, fender pile includes the ring flange at pile body, prestressing tendons and both ends, the solid pile body of concrete of pile body for containing ordinary wire net piece, the prestressing tendons is the finish rolling screw-thread rod iron, and the both ends preparation of finish rolling screw-thread rod iron is the threaded rod, and this finish rolling screw-thread rod iron can use repeatedly many times, the ring flange is the foraminiferous end flange dish of middle part recess. The invention can make the prestressed reinforcement which accounts for the larger proportion of the supporting pile cost be recycled, effectively reduce the manufacturing cost; after the supporting piles are driven into the foundation, the supporting piles mainly bear transverse thrust, and after the foundation pit is backfilled, the supporting piles lose the original value, and the embedding of the prestressed reinforcement is not meaningful; after the project is finished, the recovery of the prestressed finish-rolled deformed steel bar can greatly reduce the economic cost of the project and can also reduce the resource consumption. Has wide application prospect.

Description

Post-tensioned unbonded supporting pile capable of repeatedly utilizing prestressed reinforcement
Technical Field
The invention relates to a preparation technology of a prestressed support pile, in particular to a support pile with post-tensioned non-adhesive reusable prestressed reinforcement.
Background
The prestressed support pile has the advantages of high construction speed, good use economy, easiness in mass production, good pile body quality, good environmental effect, relatively low production cost and the like. The popularization range and the application amount of the existing prestressed support pile in foundation pit support engineering construction are gradually expanding. The prestressed supporting pile is adopted in the foundation pit supporting engineering, so that the advantage of strong bending resistance can be fully exerted, the consumption and the use amount of building materials of the foundation pit supporting prefabricated structure are reduced, the construction period of the foundation pit supporting structure is shortened, the production amount of building garbage is reduced, and the like. The support piles mainly bear the transverse thrust after being driven into the foundation. After the foundation pit is backfilled, the supporting pile loses the original value, and the prestressed reinforcement is embedded in the pile without significance.
Disclosure of Invention
The invention provides a post-tensioned non-bonded reusable prestressed reinforcement support pile which can greatly reduce engineering economic cost and reduce resource consumption.
The invention aims to solve the technical problem by adopting the following technical scheme, and the post-tensioned unbonded reusable prestressed reinforcement support pile is characterized in that:
the support pile comprises a pile body, prestressed tendons and flange plates at two ends, wherein the pile body is a concrete solid pile body containing a common steel wire mesh, the prestressed tendons are finish-rolled deformed steel bar, threaded rods are manufactured at two ends of the finish-rolled deformed steel bar, the finish-rolled deformed steel bar can be repeatedly used, the flange plate is an end flange plate with a concave middle part and holes, and the production process is characterized as follows:
(1) replacing two ends of a conventional prestressed support pile production device with the end flange plates with holes, wherein a fixed nut is welded on the hole of one end flange plate;
(2 adding common steel wire mesh sheets in the pile body, aiming at increasing the integrity and ductility of the pile;
the specific production process comprises the following steps:
(1) placing a common steel wire mesh in a support pile steel mould, and respectively penetrating a finish-rolled deformed steel bar through a pre-reserved plastic pipe pore passage; the threaded rod at one end of the finish-rolled deformed steel bar is in threaded connection with the fixed nut on the corresponding end flange plate, and the other end of the finish-rolled deformed steel bar is a tensioning end and penetrates through the hole on the corresponding end flange plate; and a movable nut is arranged at the tensioning end;
the diameter, the number, the length and the position of the finish rolling deformed steel bar are determined by the bending strength, the length and other parameters of the prestressed support pile,
(2) pouring a certain amount of concrete in a vacant slot reserved in a support pile steel formwork, and vibrating the concrete tightly in a manual vibrating mode;
(3) after the strength of the component concrete reaches not less than 75% of the design strength standard value, removing the side mold, tensioning the finish rolling deformed steel bar at a tensioning end by using a jack, stopping tensioning and keeping a load-holding state all the time after the tensioning force reaches the design, screwing a movable nut to fix the finish rolling deformed steel bar, and continuing to maintain and form;
when in piling, the pile end with the flange plate at the end of the welding fixed nut is downward, the pile end with the flange plate at the end of the movable nut is upward, and the piling process and the technical requirements are the same as those of the conventional prestressed support pile;
the method for recovering the prestressed tendons comprises the following steps:
(1) when the foundation pit is backfilled, loosening pile movable nuts at the upper ends of the supporting piles counterclockwise, and releasing pretension stress;
(2) and continuing rotating the finish-rolled threaded steel bar anticlockwise to enable the lower part of the finish-rolled threaded steel bar to be separated from the bottom end of the pile to fix the nut, then drawing out the finish-rolled threaded steel bar from the top end of the pile, and recycling the finish-rolled threaded steel bar after returning to a factory.
The technical problem to be solved by the invention can be further realized by the following technical scheme that the tension stress of the finish-rolled threaded steel bar can be adjusted for two times or more according to the excavation condition of the foundation pit in the using process of the support pile.
Compared with the prior art, the method can recycle the prestressed reinforcement accounting for a larger proportion of the supporting pile cost, and effectively reduce the manufacturing cost; after the supporting piles are driven into the foundation, the supporting piles mainly bear transverse thrust, and after the foundation pit is backfilled, the supporting piles lose the original value, and the embedding of the prestressed reinforcement is not meaningful; and after the engineering is finished, the prestressed finish-rolled deformed steel bar is recycled, so that the engineering cost can be greatly reduced, and the application prospect is wide.
Drawings
FIG. 1 is a schematic structural diagram of the present invention;
fig. 2 is a cross-sectional view of a support pile.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, and in order to make those skilled in the art understand the present invention further, the embodiments of the present invention will be described in detail and fully with reference to the accompanying drawings. 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 invention.
A post-tensioned unbonded supporting pile capable of recycling prestressed reinforcement,
the support pile comprises a pile body, prestressed tendons and flange plates at two ends, wherein the pile body is a concrete solid pile body containing a common steel wire mesh, the prestressed tendons are finish-rolled deformed steel bar, threaded rods are manufactured at two ends of the finish-rolled deformed steel bar, the finish-rolled deformed steel bar can be repeatedly used, the flange plate is an end flange plate with a concave middle part and holes, and the production process is characterized as follows:
(1) replacing two ends of a conventional prestressed support pile production device with the end flange plates with holes, wherein a fixed nut is welded on the hole of one end flange plate;
(2 adding common steel wire mesh sheets in the pile body, aiming at increasing the integrity and ductility of the pile;
the specific production process comprises the following steps:
(2) placing a common steel wire mesh in a support pile steel mould, and respectively penetrating a finish-rolled deformed steel bar through a pre-reserved plastic pipe pore passage; the threaded rod at one end of the finish-rolled deformed steel bar is in threaded connection with the fixed nut on the corresponding end flange plate, and the other end of the finish-rolled deformed steel bar is a tensioning end and penetrates through the hole on the corresponding end flange plate; and a movable nut is arranged at the tensioning end;
the diameter, the number, the length and the position of the finish rolling deformed steel bar are determined by the bending strength, the length and other parameters of the prestressed support pile,
(2) pouring a certain amount of concrete in a vacant slot reserved in a support pile steel formwork, and vibrating the concrete tightly in a manual vibrating mode;
(3) after the strength of the component concrete reaches not less than 75% of a design strength standard value, removing the side mold, tensioning the finish rolling deformed steel bar at a tensioning end by using a jack, stopping tensioning and keeping a load state all the time after the tensioning force reaches a design value, wherein equipment used in the process is completely the same as the existing process, a movable nut is screwed down to fix the finish rolling deformed steel bar, and the maintenance and the molding are continued; the effective pre-stress of concrete design designed according to the technical standards of enterprises, for example, a supporting pile with a section of 350mm x 500mm, is 5.1MPa, and if two pieces of finish-rolled deformed steel bar with the diameter of phi 30 are used, the pre-stress needs to reach more than 884 kN.
When in piling, the pile end with the flange plate at the end of the welding fixed nut is downward, the pile end with the flange plate at the end of the movable nut is upward, and the piling process and the technical requirements are the same as those of the conventional prestressed support pile;
the method for recovering the prestressed tendons comprises the following steps:
(1) when the foundation pit is backfilled, loosening pile movable nuts at the upper ends of the supporting piles counterclockwise, and releasing pretension stress;
(2) continuing to rotate the finish-rolled threaded steel bar counterclockwise to enable the lower part of the finish-rolled threaded steel bar to be separated from the bottom end of the pile to fix a nut, then drawing out the finish-rolled threaded steel bar from the top end of the pile, and recycling the finish-rolled threaded steel bar after returning to a factory;
in the using process of the support pile, the tension stress of the finish-rolled deformed steel bar can be adjusted for two or more times according to the excavation condition of the foundation pit.
In fig. 1: 1. the steel bar comprises a steel bar mesh, 2 angle ribs, 3 end flange plates, 4 finish-rolled threaded steel bars, 5 fixing nuts and 6 movable nuts.
With reference to figure 1 of the drawings,
the method comprises the steps of placing specially-made end flange discs 3 at two ends of a support pile steel mould, coating special grease on the surfaces of two finish-rolled threaded steel rods 4 and enabling the two finish-rolled threaded steel rods to penetrate through a plastic pipe pore passage, then placing the two finish-rolled threaded steel rods into a mould, screwing the finish-rolled threaded steel rods 4 into fixing nuts 5 of the specially-made end flange discs 3 clockwise for fixing, placing a common reinforcing mesh sheet 1 in the mould for fixing the finish-rolled threaded steel rods 4, then enabling the specially-made end flange discs 3 to penetrate through the other ends of the finish-rolled threaded steel rods 4 and to be installed on the mould, and screwing movable nuts 6 into grooves of the specially-made flange discs 3.

Claims (2)

1. The utility model provides a post-tensioned unbonded reusable prestressed reinforcement's fender pile which characterized in that:
the support pile comprises a pile body, prestressed tendons and flange plates at two ends, wherein the pile body is a concrete solid pile body containing a common steel wire mesh, the prestressed tendons are finish-rolled deformed steel bar, threaded rods are manufactured at two ends of the finish-rolled deformed steel bar, the finish-rolled deformed steel bar can be repeatedly used, the flange plate is an end flange plate with a concave middle part and holes, and the production process is characterized as follows:
(1) replacing two ends of a conventional prestressed support pile production device with the end flange plates with holes, wherein a fixed nut is welded on the hole of one end flange plate;
(2 adding common steel wire mesh sheets in the pile body, aiming at increasing the integrity and ductility of the pile;
the specific production process comprises the following steps:
placing a common steel wire mesh in a support pile steel mould, and respectively penetrating a finish-rolled deformed steel bar through a pre-reserved plastic pipe pore passage; the threaded rod at one end of the finish-rolled deformed steel bar is in threaded connection with the fixed nut on the corresponding end flange plate, and the other end of the finish-rolled deformed steel bar is a tensioning end and penetrates through the hole on the corresponding end flange plate; and a movable nut is arranged at the tensioning end;
the diameter, the number, the length and the position of the finish rolling deformed steel bar are determined by the bending strength, the length and other parameters of the prestressed support pile,
(2) pouring a certain amount of concrete in a vacant slot reserved in a support pile steel formwork, and vibrating the concrete tightly in a manual vibrating mode;
(3) after the strength of the component concrete reaches not less than 75% of the design strength standard value, removing the side mold, tensioning the finish rolling deformed steel bar at a tensioning end by using a jack, stopping tensioning and keeping a load-holding state all the time after the tensioning force reaches the design value, screwing a movable nut to fix the finish rolling deformed steel bar, and continuing to maintain and form;
when in piling, the pile end with the flange plate at the end of the welding fixed nut is downward, the pile end with the flange plate at the end of the movable nut is upward, and the piling process and the technical requirements are the same as those of the conventional prestressed support pile;
the method for recovering the prestressed tendons comprises the following steps:
(1) when the foundation pit is backfilled, loosening the movable nuts at the upper ends of the supporting piles counterclockwise, and releasing the pre-tensioning stress;
(2) and continuing rotating the finish-rolled threaded steel bar anticlockwise to enable the lower part of the finish-rolled threaded steel bar to be separated from the bottom end of the pile to fix the nut, then drawing out the finish-rolled threaded steel bar from the top end of the pile, and recycling the finish-rolled threaded steel bar after returning to a factory.
2. The post-tensioned non-bonded reusable prestressed reinforcement support pile of claim 1, wherein: in the using process of the support pile, the tension stress of the finish-rolled deformed steel bar can be adjusted for two or more times according to the excavation condition of the foundation pit.
CN202111585122.8A 2021-12-22 2021-12-22 Post-tensioned unbonded supporting pile capable of repeatedly utilizing prestressed reinforcement Pending CN114370051A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111585122.8A CN114370051A (en) 2021-12-22 2021-12-22 Post-tensioned unbonded supporting pile capable of repeatedly utilizing prestressed reinforcement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111585122.8A CN114370051A (en) 2021-12-22 2021-12-22 Post-tensioned unbonded supporting pile capable of repeatedly utilizing prestressed reinforcement

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CN114370051A true CN114370051A (en) 2022-04-19

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107366289A (en) * 2017-06-29 2017-11-21 宁波冶金勘察设计研究股份有限公司 Foundation ditch concrete support pilework that live borehole pours and preparation method thereof
CN213897088U (en) * 2020-08-12 2021-08-06 成都基泰科技有限公司 PSB finish rolling screw-thread steel prestressed concrete fender pile structure

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107366289A (en) * 2017-06-29 2017-11-21 宁波冶金勘察设计研究股份有限公司 Foundation ditch concrete support pilework that live borehole pours and preparation method thereof
CN213897088U (en) * 2020-08-12 2021-08-06 成都基泰科技有限公司 PSB finish rolling screw-thread steel prestressed concrete fender pile structure

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