CN114368060B - Production process of unbonded post-tensioning recyclable prestressed tendon pipe pile - Google Patents
Production process of unbonded post-tensioning recyclable prestressed tendon pipe pile Download PDFInfo
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- CN114368060B CN114368060B CN202111585105.4A CN202111585105A CN114368060B CN 114368060 B CN114368060 B CN 114368060B CN 202111585105 A CN202111585105 A CN 202111585105A CN 114368060 B CN114368060 B CN 114368060B
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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 but post-tensioning reuse prestressing tendons tubular pile's production process after no bonding, includes pile body, prestressing tendons and ring flanges at both ends, the pile body is the hollow pile body of concrete that contains ordinary steel wire net piece, prestressing tendons is finish rolling screw thread steel bar, and the both ends of finish rolling screw thread steel bar are made to be the threaded rod, and this finish rolling screw thread steel bar can repeatedly use many times, the ring flange is a concave and foraminiferous end ring flange in middle part, and after component concrete strength reached not less than 75% of design strength standard value, demolish the side mould, stretch-draw, back movable nut screws up and fixes the finish rolling screw thread steel bar, continues the maintenance shaping. The invention can recycle the prestressed reinforcement accounting for a larger proportion of the pipe pile cost, thereby effectively reducing the manufacturing cost; after the pipe pile is driven into the foundation, the axial pressure is born, and after the conventional prestressed reinforcement is canceled, the axial load of the pipe pile can be unloaded, so that the axial pressure ratio of the pipe pile 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 non-bonding post-tensioning recyclable prestressed pipe pile.
Background
The post-tensioning prestressed pipe pile is a hollow cylinder body slender concrete prefabricated part manufactured by a post-tensioning prestressing process and a centrifugal forming method, and mainly comprises a cylindrical pile body, an end plate, a steel hoop and the like. The prestressed tendons have the main function of preventing the pipe pile from cracking and affecting the use of the pipe pile under the condition of external load such as hoisting, transportation, construction and the like. The prestressed pipe pile mainly bears pressure, and part of bearing capacity of the pipe pile is lost 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 overcoming the defects of the prior art, and provides a production process of a non-bonding post-tensioning recyclable prestressed tendon pipe pile, which can improve the quality of the pipe pile and reduce the resource consumption.
The invention aims to solve the technical problems by the following technical scheme, and discloses a production process of a non-bonding post-tensioning recyclable prestressed tendon pipe pile, which is characterized by comprising the following steps of:
the tubular pile comprises a pile body, prestressed tendons and flanges at two ends, wherein the pile body is a concrete hollow pile body containing a common steel wire mesh, the prestressed tendons are finish-rolled threaded steel bars, the two ends of each finish-rolled threaded steel bar are made into threaded rods, the finish-rolled threaded steel bars can be repeatedly used, and the flanges are end flanges with concave middle parts and holes, and the production process is as follows:
(1) The two ends of the conventional tubular pile production device are replaced by the end flange with the holes, and a fixing nut is welded on the hole of one end flange;
(2 adding a common steel wire mesh sheet into the pile body, wherein the purpose is to increase the integrity and ductility of the pile;
the specific production process comprises the following steps:
(1) Placing a common steel wire mesh in the tubular pile steel mould, and respectively passing the finish-rolled threaded steel bars through the pre-reserved plastic pipe pore canals; the threaded rod at one end of the finish rolling threaded steel rod is in threaded connection with the fixing nut on the corresponding end flange, the other end of the finish rolling threaded steel rod is a tensioning end, and the tensioning end penetrates through the upper hole of the corresponding end flange; and a movable nut is arranged at the tensioning end;
the diameter, the number, the length and the positions of the finish rolled deformed steel bars are determined by parameters such as the bending strength, the length and the like of the prestressed pipe pile,
(2) Pouring quantitative concrete in a hollow groove reserved in the tubular pile template, and adopting the traditional process to carry out centrifugal shaping, normal-pressure steam curing, demoulding and high-pressure steam curing;
(3) After the concrete strength of the component reaches 75% of the standard value of the design strength, removing the side die, tensioning the finish rolling threaded steel rod at the tensioning end by adopting a jack, stopping tensioning and keeping the state of charge all the time after the tensioning force reaches the design value, screwing a movable nut to fix the finish rolling threaded steel rod, and continuing to maintain and form;
pile end with welded fixed nut end flange is downward while piling, pile end with movable nut end flange is upward, pile process and technical requirement are the same as conventional prestressed pipe pile;
the method for recovering the prestressed tendons comprises the following steps:
(1) When the backfilling of the foundation pit is finished, the upper end of the pipe pile loosens the movable nut in a counterclockwise direction, and the pre-tensioning stress is released;
(2) And continuously rotating the finish rolling threaded steel rod in a counter-clockwise manner to enable the lower part of the finish rolling threaded steel rod to be separated from the pile bottom end fixing nut, and then extracting the finish rolling threaded steel rod from the pile top end, and recycling the finish rolling threaded steel rod after returning to a factory.
The technical problem to be solved by the invention can be further solved by the following technical scheme, and the tension stress of the finish rolling threaded steel rod can be adjusted for two or more times according to the excavation condition of the foundation pit in the use process of the tubular pile.
Compared with the prior art, the invention can recycle the prestressed reinforcement which occupies a larger proportion of the pipe pile cost, thereby effectively reducing the manufacturing cost; after the pipe pile is driven into the foundation, axial pressure is born, and after conventional prestressed reinforcement is cancelled, axial load of the pipe pile can be unloaded, so that the axial pressure ratio of the pipe pile is reduced, and the axial pressure bearing performance of the pile is effectively improved; when the novel tubular pile is used for supporting engineering piles, special tools can be adopted according to engineering characteristics and foundation pit excavation procedures, the stress level of the prestressed tendons is adjusted by adjusting the tightness of the nuts at the upper end, so that the crack resistance and the bending resistance of the supporting tubular pile are improved, after the engineering is finished, the prestressed finish rolling threaded steel can be recycled, the engineering cost can be greatly reduced, and the application prospect is wide.
Drawings
FIG. 1 is a schematic diagram of a structure of the present invention;
FIG. 2 is a schematic drawing of the present invention;
fig. 3 is a cross-sectional view of a flange in accordance with the present invention.
Detailed Description
The following further describes the specific technical solutions of the present invention, so that the purpose, technical solutions and advantages of the embodiments of the present invention will be more apparent to those skilled in the art to further understand the present invention, and the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments, but not limitations on the claims thereof. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
A production process of a non-bonding post-tensioning recyclable prestressed tendon pipe pile,
the tubular pile comprises a pile body, prestressed tendons and flanges at two ends, wherein the pile body is a concrete hollow pile body containing a common steel wire mesh, the prestressed tendons are finish-rolled threaded steel bars, the two ends of each finish-rolled threaded steel bar are made into threaded rods, the finish-rolled threaded steel bars can be repeatedly used, and the flanges are end flanges with concave middle parts and holes, and the production process is as follows:
(1) The two ends of the conventional pipe pile production device are replaced by the end flange plates with the holes 14, and a fixing nut 15 is welded on the hole of one end flange plate;
(2 adding a common steel wire mesh sheet into the pile body, wherein the purpose is to increase the integrity and ductility of the pile;
the specific production process comprises the following steps:
(2) Placing a common steel wire mesh in the tubular pile steel mould, and respectively passing the finish-rolled threaded steel bars through the pre-reserved plastic pipe pore canals; the threaded rod at one end of the finish rolling threaded steel rod is in threaded connection with the fixing nut on the corresponding end flange, the other end of the finish rolling threaded steel rod is a tensioning end, and the tensioning end penetrates through the upper hole of the corresponding end flange; and a movable nut is arranged at the tensioning end;
the diameter, the number, the length and the positions of the finish rolled deformed steel bars are determined by parameters such as the bending strength, the length and the like of the prestressed pipe pile,
(2) Pouring quantitative concrete in a hollow groove reserved in the tubular pile template, and adopting the traditional process to carry out centrifugal shaping, normal-pressure steam curing, demoulding and high-pressure steam curing;
(3) After the concrete strength of the component reaches 75% of the standard value of the design strength, removing the side die, tensioning the finish rolling threaded steel rod at the tensioning end by adopting a jack, stopping tensioning and keeping the state of charge all the time after the tensioning force reaches the design value, screwing a movable nut to fix the finish rolling threaded steel rod, and continuing to maintain and form;
pile end with welded fixed nut end flange is downward while piling, pile end with movable nut end flange is upward, pile process and technical requirement are the same as conventional prestressed pipe pile;
the method for recovering the prestressed tendons comprises the following steps:
(1) When the backfilling of the foundation pit is finished, the upper end of the pipe pile loosens the movable nut in a counterclockwise direction, and the pre-tensioning stress is released;
(2) Continuously rotating the finish rolling threaded steel rod in a counter-clockwise manner to enable the lower part of the finish rolling threaded steel rod to be separated from a pile bottom end fixing nut, then extracting the finish rolling threaded steel rod from the pile top end, and recycling the finish rolling threaded steel rod after returning to a factory;
in the use process of the pipe pile, the tension stress of the finish rolling threaded steel rod can be adjusted for two or more times according to the excavation condition of the 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-stress of concrete in a common prestressed pipe pile is 4-10 MPa, the tensile strength of a steel bar is 1860MPa, the tensile strength is 60-75%, and the stress of a steel bar is 1116-1395 MPa. The materials and parameters used in the production process of the prestressed pipe pile with the reusable prestressed tendons are as follows, and 40mm of finish rolled deformed steel bar is taken as an example, the tensile strength is 1080MPa, the tensioning is 60-75%, the prestressed tendon stress is 640-810 MPa, the concrete pre-compression stress is 6-8 MPa, and the performance requirement of the common prestressed pipe pile is met.
The invention has the following advantages:
(1) The prestressed reinforcement can be reused, so that the manufacturing cost can be effectively reduced;
(2) After the pipe pile is driven into the foundation, the prestressed tendons are taken out, so that the axial pressure ratio of the prestressed tendons can be reduced, and the axial pressure bearing performance of the pile is effectively improved;
(3) The FRP rib net sheet can improve the integrity, the ductility and the durability of the pile body.
In fig. 1: 1. finish rolling screw thread steel bar, 2 stretch-draw end flange, 3 fixed end flange, 4 stretch-draw end nut, 5 pile body, 6 ordinary reinforcing bar net piece, 7 fixed end nut.
Referring to fig. 1, a post-tensioning non-bonding reusable prestressed tendon pipe pile is produced by the following steps:
(1) The common steel bar net sheet 6 is placed in the pipe pile steel mould, the special flanges 2 and 3 are placed at two ends of the steel mould, and a plurality of steel bars for connecting with concrete are welded at the inner sides of the flanges at the two ends.
(2) Threading the flanges at two ends of a finish rolling threaded steel rod 1, and screwing a tensioning end nut 4, wherein the diameter, the number, the length and the position of the finish rolling threaded steel are related to parameters such as bending strength, length and the like of the prestressed pipe pile;
(3) Pouring quantitative concrete in empty slots reserved in the tubular pile steel template, forming piles by centrifugation, and steaming at normal pressure;
in fig. 2: 8. the hydraulic jack is arranged at the bottom of the hydraulic jack, the tensioning pedestal is arranged at the bottom of the hydraulic jack, and the hydraulic jack is arranged at the bottom of the hydraulic jack.
Referring to fig. 2, the tensioning process is:
(4) In fig. 2, after the concrete strength of the member reaches a prescribed strength (generally not lower than 75% of the standard value of the design strength), the form is removed, the form is lifted to a tensioning station, the bottom end of the pipe pile is supported by a fixed pedestal 4, the top end of the pile is tensioned by a hydraulic jack 2, and the hydraulic jack and the finish rolling screw thread steel at the top end of the pipe pile are connected by a movable sleeve 1. After the tension reaches the designed value, stopping the tension and keeping the state of charge 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 upper flange plate, fixing the finish rolling screw thread steel, and then continuing to maintain.
The technical requirements of the lifting and piling equipment of the novel prestressed pipe pile are the same as those of the conventional prestressed pipe pile, the pile end with the welded fixed nut flange plate 3 is downward during piling, the pile end with the movable nut flange plate 2 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 upper end of the section pipe pile is driven to a certain elevation (meeting the requirement of conventional pile extension), a special tool is adopted to loosen a pile top anchoring (finish rolling screw thread steel) nut in a counter-clockwise manner, and the pre-tensioning stress is released;
(2) And continuing to rotate the finish rolling deformed steel bar counter clockwise to separate the lower part of the finish rolling deformed steel bar from the pile bottom end fixing nut, and then withdrawing the finish rolling deformed steel bar from the pile top end. And (5) recycling after returning to the factory.
Claims (2)
1. A production process of a non-bonding post-tensioning recyclable prestressed tendon pipe pile is characterized by comprising the following steps of:
the tubular pile comprises a pile body, prestressed tendons and flanges at two ends, wherein the pile body is a concrete hollow pile body containing a common steel wire mesh, the prestressed tendons are finish-rolled threaded steel bars, the two ends of each finish-rolled threaded steel bar are made into threaded rods, the finish-rolled threaded steel bars can be repeatedly used, and the flanges are end flanges with concave middle parts and holes, and the production process is as follows:
(1) The two ends of the conventional tubular pile production device are replaced by the end flange with the holes, and a fixing nut is welded on the hole of one end flange;
(2) The common steel wire meshes are added into the pile body, so that the integrity and the ductility of the pile are improved;
the specific production process comprises the following steps:
(1) Placing a common steel wire mesh in the tubular pile steel mould, and respectively passing the finish-rolled threaded steel bars through the pre-reserved plastic pipe pore canals; the threaded rod at one end of the finish rolling threaded steel rod is in threaded connection with the fixing nut on the corresponding end flange, the other end of the finish rolling threaded steel rod is a tensioning end, and the tensioning end penetrates through the upper hole of the corresponding end flange; and a movable nut is arranged at the tensioning end;
the diameter, the number, the length and the position of the finish rolled deformed steel bar are determined by the bending strength and the length parameters of the prestressed pipe pile,
(2) Pouring quantitative concrete in a hollow groove reserved in the tubular pile template, and adopting the traditional process to carry out centrifugal shaping, normal-pressure steam curing, demoulding and high-pressure steam curing;
(3) After the concrete strength of the component reaches 75% of the standard value of the design strength, removing the side die, tensioning the finish rolling threaded steel rod at the tensioning end by adopting a jack, stopping tensioning and keeping the state of charge all the time after the tensioning force reaches the design value, screwing a movable nut to fix the finish rolling threaded steel rod, and continuing to maintain and form;
pile end with welded fixed nut end flange is downward while piling, pile end with movable nut end flange is upward, pile process and technical requirement are the same as conventional prestressed pipe pile;
the method for recovering the prestressed tendons comprises the following steps:
(1) When the backfilling of the foundation pit is finished, the upper end of the pipe pile loosens the movable nut in a counterclockwise direction, and the pre-tensioning stress is released;
(2) And continuously rotating the finish rolling threaded steel rod in a counter-clockwise manner to enable the lower part of the finish rolling threaded steel rod to be separated from the pile bottom end fixing nut, and then extracting the finish rolling threaded steel rod from the pile top end, and recycling the finish rolling threaded steel rod after returning to a factory.
2. The process for producing the unbonded post-tensioning reusable prestressed tendon pipe pile according to claim 1, which is characterized in that: in the use process of the pipe pile, the tension stress of the finish rolling threaded steel rod is adjusted for multiple times according to the excavation condition of the foundation pit.
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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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| Application Number | Priority Date | Filing Date | Title |
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| 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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| CN114368060A CN114368060A (en) | 2022-04-19 |
| CN114368060B true 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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| CN114368060A (en) | 2022-04-19 |
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