CN102400441A - Method for installing and using cable-stayed bridge reinforced concrete cable tower prestressed system - Google Patents
Method for installing and using cable-stayed bridge reinforced concrete cable tower prestressed system Download PDFInfo
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- CN102400441A CN102400441A CN2011103872520A CN201110387252A CN102400441A CN 102400441 A CN102400441 A CN 102400441A CN 2011103872520 A CN2011103872520 A CN 2011103872520A CN 201110387252 A CN201110387252 A CN 201110387252A CN 102400441 A CN102400441 A CN 102400441A
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Abstract
The invention belongs to the technical field of cable-stayed bridge construction, in particular relates to a method for installing and using a cable-stayed bridge reinforced concrete cable tower prestressed system, and solves the problem that a steel bar, a prestressed end and a prestressed steel bar at the prestressed end are subjected to cross interference due to the traditional anchor box with the prestressed end. The method comprises the following steps of: precasting a prestressed system, namely fixing a pier head anchor, an anchor box and a prestressed steel wire bundle; measuring and lofting the position of the anchor box; installing the anchor box; installing the prestressed system; performing prestressed tensioning and mud jacking; and performing water prevention and anchor sealing. The invention has the advantages that: the influence of the end on the common steel bar can be reduced, and the steel bar is prevented from being cut off; and a special template is not required to be installed during subsequent anchor sealing, the cubic amount of used concrete is small, workload is low, and the prestressed system is easy to construct.
Description
Technical field
The invention belongs to the CONSTRUCTION OF CABLE-STAYED BRIDGE technical field, be specifically related to a kind of installation and method for using of cable stayed bridge steel concrete Sarasota prestress system.
Background technology
On the prestressed reinforced concrete Sarasota of cable stayed bridge, the form that the prestressing force termination adopts anchor plate to combine with ground tackle need be provided with square in the end or doughnut case (anchor recess), and this anchor case (anchor recess) takies certain space on Sarasota.But; Because after applying prestressing force; The concrete local compressive stress in Sarasota prestressing force end is regional bigger than other, therefore, when the Sarasota structure design, closeer reinforcing bar need be set in the prestressing force end; Like this, just cause the reinforcing bar that prestressing force termination anchor case (anchor recess) locates and the presstressed reinforcing steel chiasma interference of prestressing force termination and prestressing force end.In traditional construction, generally take following measure: the plain bars that blocks prestressing force termination and presstressed reinforcing steel place; Simultaneously the reinforcing bar of truncated position is taked reinforcement measure, the problem that this measure exists is that the artificial governing factor in the construction is many, working procedure is complicated, has brought difficulty to site operation tissue and technical management; Simultaneously; This anchor case (anchor recess) need be with concrete with its sealing off and covering anchorage after pre-stress construction finishes, and anchor case (anchor recess) volume is bigger during sealing off and covering anchorage, dedicated templates need be set carry out sealing off and covering anchorage; The sealing off and covering anchorage technological requirement is high, and is long in time limit, investment is big.
Summary of the invention
The reinforcing bar that the present invention causes for the anchor case (anchor recess) that solves traditional prestress system lower end on the Cable-stayed Bridge Pylon and the presstressed reinforcing steel chiasma interference of prestressing force termination and prestressing force end and block, the problem of anchor case (anchor recess) large tracts of land sealing off and covering anchorage; The traditional prestressed system is changed into the steel tendon prestress system that has anchor case and pier nose anchor; Anchor case under this prestress system combines by having inside and outside sleeve pipe, anchor plate and protective cover plate; Avoid the presstressed reinforcing steel chiasma interference at reinforcing bar and prestressing force anchor head and prestressing force anchor head place and blocked reinforcing bar; Simplify the pre-stress construction process simultaneously, a kind of installation and method for using of cable stayed bridge steel concrete Sarasota prestress system is provided.
The present invention adopts following technical scheme to realize:
The installation and the method for using of cable stayed bridge steel concrete Sarasota prestress system, step is following:
1), prestress system is prefabricated,
Prefabricated pier nose anchor, the pier nose anchor comprises anchor ring and nut, anchor ring and nut thread cooperate,
Prefabricated anchor case, the anchor case comprises inner sleeve, outer sleeve, anchor plate and protective cover plate, and inner sleeve and outer sleeve are welded in the anchor plate both sides respectively, have through hole in the middle of the anchor plate, and the through hole internal diameter is identical with the anchor ring external diameter, and the termination of protective cover plate and outer sleeve is supporting,
Prestressing steel wire bunch is through in the bellows, and prestressing steel wire bunch penetrates the pier nose anchor and the termination is fixed on the anchor ring through intermediate plate;
2) measure also setting-out anchor case position,
Carry out three-dimensional at the scene by the design attitude of anchor case and accurately measure setting-out, the line identifier of going forward side by side, for anchor case installed position but spacing less than the reinforcing bar of inside and outside sleeve diameter, finely tune and dodge the anchor case;
3), the anchor case is installed,
According to measuring the setting-out identification point anchor case is installed, anchor plate is fixed on the works of periphery, places spiral reinforcement in advance in inner sleeve one side of anchor case, and for the shaped form prestress system, adjustment anchor case is to the engineering design angle;
4), the prestressed system,
Penetrating the anchor case with the supporting prestressing steel wire bunch that has pier nose anchor and bellows of anchor case; Anchor ring is through in the through hole in the middle part of the anchor plate and through nut and is fixed on the anchor plate; Bellows is enclosed within on the inner sleeve and the two is interfixed and seals; Simultaneously protective cover plate is installed in the termination of outer sleeve, so far accomplishes prestress system and install;
5), prestressed stretch-draw and mud jacking,
Remove protective cover plate, adopt the prestressed stretch-draw jack and the stretch-draw anchoring part that are complementary with the pier nose anchor to carry out stretch-draw, after stretch-draw finishes, carry out the prestress pipe mud jacking through the mud jacking hole of reserving on the pier nose anchor;
6), waterproof and sealing off and covering anchorage;
After mud jacking finishes, carry out pier nose anchor waterproofing work, the outer sleeve end is stayed and is established protection thickness, and the sealing off and covering anchorage reinforced mesh is installed, and directly concrete perfusion carries out sealing off and covering anchorage then.
The present invention has following beneficial effect: the anchor case that (1) has internal and external casing and anchor plate integrates anchor plate, the anchor case (anchor recess) of traditional prestressed termination; The diameter of anchor case inside and outside sleeve is little; Can not adjust rebar spacing or suitably adjust and get final product; And can reduce the influence of end, avoid reinforcing bar to block plain bars; (2) it is long-pending little to have an anchor casing of internal and external casing and anchor plate, and the later stage sealing off and covering anchorage need not be installed dedicated templates, and used concrete square amount is few, and workload is little, is easy to construction; (3) protective cover plate of outer sleeve termination can prevent construction period foreign material entering anchor ring, reduces the preceding preparation of prestressed stretch-draw; (4) the stretch-draw anchoring part that adopts is convenient and practical, for prestressed stretch-draw provides enough space outerpaces.
Description of drawings
Fig. 1 is prestress system assembling sketch map
Fig. 2 is a prestress system stretching process sketch map
Fig. 3 is prestress system construction finishing back sketch map
Fig. 4 is an anchor case sketch map
Fig. 5 is the prestressing steel wire bunch sketch map that has the termination anchor
Straight line sketch map when Fig. 6 installs for the anchor case
Arrangement of curves sketch map when Fig. 7 installs for the anchor case
Fig. 8 is the anchor case sketch map that mounting reinforcing steel bars is directly dodged on Sarasota
Fig. 9 has bent the sketch map of dodging for anchor case mounting reinforcing steel bars on Sarasota
Among the figure: 1-outer sleeve, 2-anchor plate, 3-inner sleeve, 4-anchor ring, 5-nut, 6-prestressing steel wire bunch; The 7-intermediate plate, 8-mud jacking hole, 9-indented bars, 10-bellows, 11-prestress pipe, 12-protective cover plate; 13-Sarasota concrete surface, 14-tension rod, 15-stretch-draw anchoring part, 16-jack, 17-tension ground tackle, 18-sealing off and covering anchorage concrete; 19-sealing off and covering anchorage reinforced mesh, 20-reinforcing bar, 21-bent-up bar, 22-anchor case, 23-Sarasota concrete.
The specific embodiment
The specific embodiment of the invention is:
(1) prestress system is prefabricated
The prestress system that adopts prestressing steel wire bunch, pier nose anchor to combine with the anchor case; The anchor ring of pier nose anchor and nut are prefabricated in advance; And prestressing steel wire bunch, pier nose anchor and the bellows that is through on the prestressing steel wire bunch carried out integral installation; Wherein anchor ring and nut are to be threaded, and prestressing steel wire bunch is fixed on the anchor cup with intermediate plate.The anchor case is made up of inner sleeve, outer sleeve, middle part anchor plate and protective cover plate four parts with holes; Connect with weld seam between first three part; To guarantee during welding that anchor plate is injury-free; Protective cover plate is installed in the termination of outer sleeve after installed under prestressing is accomplished, be used to protect the anchor case not influenced by foreign material.The prestress system requirement will be satisfied in the internal diameter of inside and outside sleeve, the aperture of anchor plate; The length of inside and outside sleeve will meet the prestress system requirement; The thickness of anchor plate is wanted to carry the prestressed stretch-draw value; The termination shape of outer sleeve will be complementary with the Sarasota face.The anchor case carries out prefabricated in factory.
Prestressing steel wire bunch all requires accurately the calculating and the blanking of cutting length, and error is ± 10mm; Each root steel wire length difference is not more than 1/5000 of steel wire length in the steel tendon, and is not more than 5mm; The steel tendon of accomplishing blanking is after the anchor cup of pier nose anchor is installed in the stock ground down, and accurately cutting is neat with emery wheel; When adopting integral installation, bellows is coaxial with the pier nose anchor.
(2) measure also setting-out anchor case position
Design attitude by the anchor case carries out accurately measurement setting-out of three-dimensional at the scene, and the line identifier of going forward side by side for the reinforcing bar of anchor case place spacing less than the inside and outside sleeve diameter, is finely tuned, and concrete grammar is that reinforcing bar is bent.
(3) the anchor case is installed
According to measuring the setting-out identification point anchor case is installed, anchor plate is fixed on the works of periphery, places spiral reinforcement in advance in inner sleeve one side of anchor case, for the shaped form prestress system, should adjust the anchor case to design angle.
(4) prestressed system
Passing the anchor case with the supporting prestressing steel wire bunch that has pier nose anchor and bellows of anchor case; Wherein, Bellows is through on the inner sleeve, is fixed and seals with plastic adhesive tape, and the pier nose anchor is fixed on the anchor plate with nut; Simultaneously protective cover plate is installed in the termination of outer sleeve, so far accomplishes prestress system and install.
(5) prestressed stretch-draw and mud jacking
The prestressing force pull system that adopts prestressing steel wire bunch pier nose anchor to be complementary is carried out stretch-draw; Tensioning system includes tension rod, jack, tension ground tackle and stretch-draw anchoring part; After stretch-draw finishes; With nut anchor ring is fixed on the anchor plate of anchor case, and carries out the prestress pipe mud jacking through the mud jacking hole of reserving on the pier nose anchor.
(6) waterproof and sealing off and covering anchorage
After mud jacking finishes, carry out pier nose anchor waterproofing work, carry out sealing off and covering anchorage then.
Claims (1)
1. the installation and the method for using of a cable stayed bridge steel concrete Sarasota prestress system is characterized in that step is following:
1), prestress system is prefabricated,
Prefabricated pier nose anchor, pier nose anchor comprise anchor ring (4) and nut (5), anchor ring (4) and nut (5) threaded engagement,
Prefabricated anchor case; The anchor case comprises inner sleeve (3), outer sleeve (1), anchor plate (2) and protective cover plate (12); Inner sleeve (3) and outer sleeve (1) are welded in anchor plate (2) both sides respectively, have through hole in the middle of the anchor plate (2), and the through hole internal diameter is identical with anchor ring (4) external diameter; Protective cover plate (12) is supporting with the termination of outer sleeve (1)
Prestressing steel wire bunch (6) is through in the bellows (10), and prestressing steel wire bunch (6) penetrates the pier nose anchor and the termination is fixed on the anchor ring (4) through intermediate plate (7);
2) measure also setting-out anchor case position,
Carry out three-dimensional at the scene by the design attitude of anchor case and accurately measure setting-out, the line identifier of going forward side by side, for anchor case installed position but spacing less than the reinforcing bar (20) of inside and outside sleeve diameter, finely tune and dodge the anchor case;
3), the anchor case is installed,
According to measuring the setting-out identification point anchor case is installed, anchor plate (2) is fixed on the works of periphery, places spiral reinforcement (9) in advance in inner sleeve (3) one sides of anchor case, and for the shaped form prestress system, adjustment anchor case is to the engineering design angle;
4), the prestressed system,
Penetrating the anchor case with the supporting prestressing steel wire bunch that has pier nose anchor and bellows of anchor case; Anchor ring (4) is through in the through hole in the middle part of the anchor plate (2) and through nut (5) and is fixed on the anchor plate (2); Bellows (10) is enclosed within that inner sleeve (3) is gone up and the two is interfixed and seals; Simultaneously protective cover plate (12) is installed in the termination of outer sleeve (1), so far accomplishes prestress system and install;
5), prestressed stretch-draw and mud jacking
Remove protective cover plate, adopt the prestressed stretch-draw jack (16) and the stretch-draw anchoring part (15) that are complementary with the pier nose anchor to carry out stretch-draw, after stretch-draw finishes, carry out prestress pipe (11) mud jacking through the mud jacking hole of reserving on the pier nose anchor (8);
6), waterproof and sealing off and covering anchorage;
After mud jacking finishes, carry out pier nose anchor waterproofing work, outer sleeve (1) end is stayed and is established protection thickness, and sealing off and covering anchorage reinforced mesh (19) is installed, and directly concrete perfusion carries out sealing off and covering anchorage then.
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| CN2011103872520A CN102400441B (en) | 2011-11-29 | 2011-11-29 | Method for installing and using cable-stayed bridge reinforced concrete cable tower prestressed system |
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| CN2011103872520A CN102400441B (en) | 2011-11-29 | 2011-11-29 | Method for installing and using cable-stayed bridge reinforced concrete cable tower prestressed system |
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| CN102400441A true CN102400441A (en) | 2012-04-04 |
| CN102400441B CN102400441B (en) | 2013-12-11 |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102691268A (en) * | 2012-06-12 | 2012-09-26 | 宁波二十冶建设有限公司 | Stretching construction process of super-long prestressed tendon |
| CN103924520A (en) * | 2014-04-10 | 2014-07-16 | 中交一公局第一工程有限公司 | Construction method and device of suspension bridge main cable anchorage prestressed pipes |
| CN106639330A (en) * | 2017-01-19 | 2017-05-10 | 中国核工业华兴建设有限公司 | Prestressing steel strand bundle overall tractive connection device and using method thereof |
| CN107841948A (en) * | 2017-11-24 | 2018-03-27 | 中交路桥华南工程有限公司 | The avoidance adjustment structure and method of main reinforcement |
| CN108098986A (en) * | 2018-01-31 | 2018-06-01 | 广州大学 | A kind of prestressing force conductive concrete structures and preparation method thereof |
| CN108724452A (en) * | 2017-04-25 | 2018-11-02 | 周兆弟 | prefabricated centrifugal pile production method |
| CN110983984A (en) * | 2019-12-21 | 2020-04-10 | 中铁上海工程局集团有限公司 | Construction method of main tower with golden camellia type structure |
| WO2021004417A1 (en) * | 2019-07-08 | 2021-01-14 | 中建三局第二建设工程有限责任公司 | Anchoring assembly for transversely bonded prestressed steel rod for bridge tower and construction method |
| CN112647429A (en) * | 2020-12-23 | 2021-04-13 | 蒋友富 | Box girder with anchoring device and box girder bridge |
| CN113789726A (en) * | 2021-09-13 | 2021-12-14 | 中铁三局集团第二工程有限公司 | Method for constructing bridge body |
| CN114837102A (en) * | 2022-06-24 | 2022-08-02 | 中国二十二冶集团有限公司 | Method for conveniently tensioning vertical prestressed reinforcement |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102691268A (en) * | 2012-06-12 | 2012-09-26 | 宁波二十冶建设有限公司 | Stretching construction process of super-long prestressed tendon |
| CN103924520A (en) * | 2014-04-10 | 2014-07-16 | 中交一公局第一工程有限公司 | Construction method and device of suspension bridge main cable anchorage prestressed pipes |
| CN103924520B (en) * | 2014-04-10 | 2017-01-11 | 中交一公局第一工程有限公司 | Construction method and device of suspension bridge main cable anchorage prestressed pipes |
| CN106639330A (en) * | 2017-01-19 | 2017-05-10 | 中国核工业华兴建设有限公司 | Prestressing steel strand bundle overall tractive connection device and using method thereof |
| CN108724452A (en) * | 2017-04-25 | 2018-11-02 | 周兆弟 | prefabricated centrifugal pile production method |
| CN107841948A (en) * | 2017-11-24 | 2018-03-27 | 中交路桥华南工程有限公司 | The avoidance adjustment structure and method of main reinforcement |
| CN107841948B (en) * | 2017-11-24 | 2023-10-31 | 中交路桥华南工程有限公司 | Avoidance adjustment structure and method for main reinforcement |
| CN108098986A (en) * | 2018-01-31 | 2018-06-01 | 广州大学 | A kind of prestressing force conductive concrete structures and preparation method thereof |
| WO2021004417A1 (en) * | 2019-07-08 | 2021-01-14 | 中建三局第二建设工程有限责任公司 | Anchoring assembly for transversely bonded prestressed steel rod for bridge tower and construction method |
| CN110983984B (en) * | 2019-12-21 | 2021-03-12 | 中铁上海工程局集团有限公司 | Construction method of main tower with golden camellia type structure |
| CN110983984A (en) * | 2019-12-21 | 2020-04-10 | 中铁上海工程局集团有限公司 | Construction method of main tower with golden camellia type structure |
| CN112647429A (en) * | 2020-12-23 | 2021-04-13 | 蒋友富 | Box girder with anchoring device and box girder bridge |
| CN112647429B (en) * | 2020-12-23 | 2022-07-26 | 蒋友富 | Box girder with anchoring device and box girder bridge |
| CN113789726A (en) * | 2021-09-13 | 2021-12-14 | 中铁三局集团第二工程有限公司 | Method for constructing bridge body |
| CN113789726B (en) * | 2021-09-13 | 2023-03-17 | 中铁三局集团第二工程有限公司 | Method for constructing bridge body |
| CN114837102A (en) * | 2022-06-24 | 2022-08-02 | 中国二十二冶集团有限公司 | Method for conveniently tensioning vertical prestressed reinforcement |
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