CN114368060A - Production process of unbonded post-tensioning reusable prestressed tendon pipe pile - Google Patents
Production process of unbonded post-tensioning reusable prestressed tendon pipe pile Download PDFInfo
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- CN114368060A CN114368060A CN202111585105.4A CN202111585105A CN114368060A CN 114368060 A CN114368060 A CN 114368060A CN 202111585105 A CN202111585105 A CN 202111585105A CN 114368060 A CN114368060 A CN 114368060A
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- 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
- B28B21/00—Methods or machines specially adapted for the production of tubular articles
- B28B21/56—Methods or machines specially adapted for the production of tubular articles incorporating reinforcements or inserts
- B28B21/60—Methods or machines specially adapted for the production of tubular articles incorporating reinforcements or inserts prestressed reinforcements
- B28B21/62—Methods or machines specially adapted for the production of tubular articles incorporating reinforcements or inserts prestressed reinforcements circumferential laterally tensioned
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- 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
- B28B21/00—Methods or machines specially adapted for the production of tubular articles
- B28B21/02—Methods or machines specially adapted for the production of tubular articles by casting into moulds
- B28B21/10—Methods or machines specially adapted for the production of tubular articles by casting into moulds using compacting means
- B28B21/22—Methods or machines specially adapted for the production of tubular articles by casting into moulds using compacting means using rotatable mould or core parts
- B28B21/30—Centrifugal moulding
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- 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
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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
- E02D5/24—Prefabricated piles
- E02D5/30—Prefabricated piles made of concrete or reinforced concrete or made of steel and concrete
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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
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- 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
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- 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
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- 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
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- 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)
- General Engineering & Computer Science (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The utility model provides a production technology of stretch-draw reuse prestressing tendons tubular pile after unbonded, the ring flange at pile body, prestressing tendons and both ends, the concrete hollow pile body of pile body for containing ordinary steel wire net piece, the prestressing tendons is finish rolling deformed steel bar, and the threaded rod is makeed for at the both ends of finish rolling deformed steel bar, and this finish rolling deformed steel bar can use repeatedly many times, the ring flange is the end flange dish that the middle part is recessed and foraminiferous, treats that component concrete intensity reaches 75% that is not less than the design strength standard value after, demolishs the side form, stretch-draws, and back movable nut screws up and fixes finish rolling deformed steel bar, continues the maintenance shaping. The invention can make the prestressed reinforcement which accounts for the larger proportion of the tubular pile cost be recycled, effectively reduce the cost; after the tubular pile is driven into the foundation, the axial pressure is borne, and after the conventional prestressed reinforcement is cancelled, the axial load can be unloaded, the axial pressure ratio is reduced, and the axial pressure bearing performance of the pile is effectively improved. Has wide application prospect.
Description
Technical Field
The invention relates to a production technology of a prestressed pipe pile, in particular to a production technology of a prestressed tendon pipe pile which is unbonded, tensioned and recycled.
Background
The post-tensioning prestressed pipe pile is a hollow cylindrical elongated concrete prefabricated member made by adopting post-tensioning prestressing process and centrifugal forming method, mainly formed from cylindrical pile body, end plate and steel ferrule. The prestressed tendons have the main function of preventing the concrete from cracking and influencing the use of the tubular pile under the conditions of external loads such as hoisting, transportation, construction and the like. The prestressed pipe pile mainly bears pressure, and the pipe pile loses part of bearing capacity due to the existence of prestressed tendons in the common prestressed pipe pile. If the prestressed tendons can be recycled, the performance of the prestressed pipe pile can be improved, materials can be saved, and the manufacturing cost can be reduced.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art and provides a production process for a non-adhesive post-tensioning recyclable prestressed tendon tubular pile, which can improve the quality of the tubular pile and reduce the resource consumption.
The invention aims to solve the technical problem by adopting the following technical scheme, and the production process of the unbonded and stretched recyclable prestressed tendon tubular pile is characterized by comprising the following steps of:
the tubular pile includes the ring flange at pile body, prestressing tendons and both ends, the concrete hollow pile body of pile body for containing ordinary steel 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 ring flange of middle part indent, and its production technology is as follows:
(1) replacing two ends of a conventional tubular 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 sheet in a pipe 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 pipe pile,
(2) pouring a certain amount of concrete in a hollow groove reserved in the tubular pile template, and performing centrifugal setting, normal-pressure steam curing, demolding and high-pressure steam curing by adopting a traditional process;
(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 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 pipe pile;
the method for recovering the prestressed tendons comprises the following steps:
(1) when the foundation pit is backfilled, loosening the movable nut at the upper end of the tubular pile counterclockwise, and releasing the pretensioning 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 deformed steel bar can be adjusted for two times or more according to the excavation condition of a foundation pit in the using process of the tubular pile.
Compared with the prior art, the invention can recycle the prestressed reinforcement accounting for a larger proportion of the tubular pile cost, thereby effectively reducing the manufacturing cost; after the tubular pile is driven into the foundation, the axial pressure is borne, and after the conventional prestressed reinforcement is cancelled, the axial load can be unloaded, the axial pressure ratio is reduced, and the axial pressure bearing performance of the pile is effectively improved; when the novel tubular pile is used for supporting an engineering pile, the stress level of the prestressed reinforcement can be adjusted by adjusting the tightness of the upper end nut according to engineering characteristics and a foundation pit excavation process by adopting a special tool, so that the anti-cracking and anti-bending performance of the supporting tubular pile is improved, and after the engineering is finished, the prestressed finish-rolled deformed steel bar can be 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 schematic drawing of the tension of the present invention;
fig. 3 is a cross-sectional view of the flange of the present invention.
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 production process of a prestressed tendon pipe pile which is not bonded, tensioned and recycled,
the tubular pile includes the ring flange at pile body, prestressing tendons and both ends, the concrete hollow pile body of pile body for containing ordinary steel 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 ring flange of middle part indent, and its production technology is as follows:
(1) replacing two ends of a conventional tubular pile production device with the end flange plates with the holes 14, and welding a fixing nut 15 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 sheet in a pipe 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 pipe pile,
(2) pouring a certain amount of concrete in a hollow groove reserved in the tubular pile template, and performing centrifugal setting, normal-pressure steam curing, demolding and high-pressure steam curing by adopting a traditional process;
(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 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 pipe pile;
the method for recovering the prestressed tendons comprises the following steps:
(1) when the foundation pit is backfilled, loosening the movable nut at the upper end of the tubular pile counterclockwise, and releasing the pretensioning 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 use process of the tubular pile, the tension stress of the finish rolling threaded steel bar can be adjusted for two or more times according to the excavation condition of a foundation pit.
The end flange plate consists of a flange plate surface 12 and a U-shaped cylinder 13 with a hole at the bottom, and the U-shaped cylinder is welded at the bottom of the flange plate.
Taking the production of a certain phi 500 multiplied by 100 (PHC) as an example, the effective pre-pressure of concrete in a common prestressed pipe pile is 4-10 MPa, the tensile strength of a steel bar is 1860MPa, the tension is 60-75%, and the stress of a steel bar is 1116-1395 MPa. The material and parameters used in the production process of the prestressed pipe pile with reusable prestressed tendons are as follows, taking 40mm finish rolling deformed steel bar as an example, the tensile strength is 1080MPa, the tension is 60-75%, the prestressed tendon stress is 648 MPa-810 MPa, and the concrete pre-stress is 6-8 MPa, so that the performance requirements of the common prestressed pipe pile are met.
The invention has the following advantages:
(1) the prestressed reinforcement can be repeatedly used, and the manufacturing cost can be effectively reduced;
(2) after the tubular pile is driven into the foundation, the prestressed tendons are taken out, so that the axial compression ratio of the pile can be reduced, and the axial compression bearing performance of the pile is effectively improved;
(3) the FRP rib net piece can improve the integrity, the ductility and the durability of the pile body.
In fig. 1: 1. the method comprises the following steps of finish rolling of a threaded steel bar, 2 stretching of an end flange plate, 3 fixing of the end flange plate, 4 stretching of an end nut, 5 pile bodies, 6 common reinforcing mesh sheets and 7 fixing of the end nut.
Referring to fig. 1, a post-tensioned non-bonded reusable prestressed tendon pipe pile comprises the following production processes:
(1) a common reinforcing mesh 6 is placed in a pipe pile steel mould, special flanges 2 and 3 are placed at two ends of the steel mould, and a plurality of reinforcing steel bars for connecting with concrete are welded on the inner sides of the flanges at the two ends.
(2) Penetrating a finish-rolled deformed steel bar 1 through flange plates at two ends, and screwing a tensioning end nut 4, wherein the diameter, the number, the length and the position of the finish-rolled deformed steel bar are related to parameters such as bending strength, length and the like of the prestressed pipe pile;
(3) pouring a certain amount of concrete in a hollow groove reserved in the pipe pile steel template, forming a pile through centrifugation, and performing normal-pressure steam curing;
in fig. 2: 8. casing, 9 hydraulic jacks, 10 tensioning table bases (movable), 11 tensioning table bases (fixed).
Referring to fig. 2, the tensioning process is as follows:
(4) in fig. 2, after the strength of the concrete of the component reaches the specified strength (generally not lower than 75% of the standard value of the designed strength), the template is removed, the concrete is hung to a tensioning platform, the bottom end of the tubular pile leans against a fixed pedestal 4, the top end of the tubular pile is tensioned by a hydraulic jack 2, and the hydraulic jack is connected with finish-rolled deformed steel bars at the top end of the tubular pile by a movable sleeve 1. And after the tensioning force reaches a design value, stopping tensioning and keeping the load state all the time (the equipment used in the process is completely the same as the existing process), screwing the special movable sleeve 1 into the concave hole of the flange plate at the upper end, fixing the finish-rolled deformed steel bar, and then continuing to maintain.
The lifting and piling equipment of the novel prestressed pipe pile has the same technical requirements as the conventional prestressed pipe pile, the pile end with the welding fixed nut flange 3 is downward, the pile end with the movable nut flange 2 is upward during piling, and the piling process and the technical requirements are the same as those of the conventional prestressed pipe pile.
The method for recovering the prestressed tendons comprises the following steps:
(1) when the upper end of the pipe pile is driven to a certain elevation (meeting the conventional pile extension requirement), a special tool is adopted to loosen a pile top anchoring (finish rolling deformed steel bar) nut anticlockwise, and the pre-tensioning stress is released;
(2) and continuing to rotate the finish-rolled deformed steel bar anticlockwise to enable the lower part of the finish-rolled deformed steel bar to be separated from the bottom end of the pile to fix the nut, and then drawing out the finish-rolled deformed steel bar from the top end of the pile. Can be reused after being returned to the factory.
Claims (2)
1. A production process for tensioning a reusable prestressed tendon tubular pile after unbonded connection is characterized by comprising the following steps of:
the tubular pile includes the ring flange at pile body, prestressing tendons and both ends, the concrete hollow pile body of pile body for containing ordinary steel 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 ring flange of middle part indent, and its production technology is as follows:
(1) replacing two ends of a conventional tubular 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 sheet in a pipe 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 pipe pile,
(2) pouring a certain amount of concrete in a hollow groove reserved in the tubular pile template, and performing centrifugal setting, normal-pressure steam curing, demolding and high-pressure steam curing by adopting a traditional process;
(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 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 pipe pile;
the method for recovering the prestressed tendons comprises the following steps:
(1) when the foundation pit is backfilled, loosening the movable nut at the upper end of the tubular pile counterclockwise, and releasing the pretensioning 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 production process of the unbonded post-tensioning reusable prestressed tendon tubular pile according to claim 1, which is characterized in that: in the use process of the tubular pile, the tension stress of the finish rolling threaded steel bar can be adjusted for two or more times according to the excavation condition of a foundation pit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111585105.4A CN114368060B (en) | 2021-12-22 | 2021-12-22 | Production process of unbonded post-tensioning recyclable prestressed tendon pipe pile |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111585105.4A CN114368060B (en) | 2021-12-22 | 2021-12-22 | Production process of unbonded post-tensioning recyclable prestressed tendon pipe pile |
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| Publication Number | Publication Date |
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| CN114368060A true CN114368060A (en) | 2022-04-19 |
| CN114368060B CN114368060B (en) | 2023-06-23 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1246568A (en) * | 1998-09-01 | 2000-03-08 | 朱传浦 | Temporarily prestressed concrete tubular pile |
| CN101570969A (en) * | 2009-06-04 | 2009-11-04 | 河南建华管桩有限公司 | Horizontal force supporting pile and production process thereof |
| JP2010048039A (en) * | 2008-08-25 | 2010-03-04 | Japan Pile Corp | Prestressed reinforced concrete pile |
| CN103866761A (en) * | 2014-03-21 | 2014-06-18 | 李全民 | Mechanical connection pile head using repetitively used precast concrete pile as end plate and manufacturing method of mechanical connection pile head |
| KR20150139422A (en) * | 2015-04-07 | 2015-12-11 | 주식회사 포스코 | Complex pile |
| WO2016165412A1 (en) * | 2015-04-15 | 2016-10-20 | 俞向阳 | End plate, pile connecting mechanism, connecting mechanism for tensioning reinforcement cage, concrete pile and manufacturing method |
-
2021
- 2021-12-22 CN CN202111585105.4A patent/CN114368060B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1246568A (en) * | 1998-09-01 | 2000-03-08 | 朱传浦 | Temporarily prestressed concrete tubular pile |
| JP2010048039A (en) * | 2008-08-25 | 2010-03-04 | Japan Pile Corp | Prestressed reinforced concrete pile |
| CN101570969A (en) * | 2009-06-04 | 2009-11-04 | 河南建华管桩有限公司 | Horizontal force supporting pile and production process thereof |
| CN103866761A (en) * | 2014-03-21 | 2014-06-18 | 李全民 | Mechanical connection pile head using repetitively used precast concrete pile as end plate and manufacturing method of mechanical connection pile head |
| KR20150139422A (en) * | 2015-04-07 | 2015-12-11 | 주식회사 포스코 | Complex pile |
| WO2016165412A1 (en) * | 2015-04-15 | 2016-10-20 | 俞向阳 | End plate, pile connecting mechanism, connecting mechanism for tensioning reinforcement cage, concrete pile and manufacturing method |
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| CN114368060B (en) | 2023-06-23 |
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