CN105714684A - Prestressed concrete variable cross-section fish-bellied type continuous box girder construction method - Google Patents

Prestressed concrete variable cross-section fish-bellied type continuous box girder construction method Download PDF

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Publication number
CN105714684A
CN105714684A CN201610101083.2A CN201610101083A CN105714684A CN 105714684 A CN105714684 A CN 105714684A CN 201610101083 A CN201610101083 A CN 201610101083A CN 105714684 A CN105714684 A CN 105714684A
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box
concrete
construction
fish
web
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CN201610101083.2A
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Chinese (zh)
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CN105714684B (en
Inventor
徐攀
殷滇
苏智刚
张德松
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中国一冶集团有限公司
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    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D21/00Methods or apparatus specially adapted for erecting or assembling bridges
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2101/00Material constitution of bridges
    • E01D2101/20Concrete, stone or stone-like material
    • E01D2101/24Concrete
    • E01D2101/26Concrete reinforced
    • E01D2101/28Concrete reinforced prestressed

Abstract

The invention discloses a prestressed concrete variable cross-section fish-bellied type continuous box girder construction method. According to the method, a formwork assembly part, steel bar binding and preserved hole setting part and box girder bottom plate and web plate concrete casting part in the existing prestressed concrete variable cross-section fish-bellied type continuous box girder construction method are improved. The construction difficulty is reduced, so that the construction of a prestressed concrete variable cross-section fish-bellied type continuous box girder becomes simple; the operation is simple.

Description

Prestress concrete variable cross-section fish-belly continuous box beam construction method

Technical field

The present invention relates to the field of the variable cross-section fish-belly continuous box beam in technical field of bridge engineering, prestressed concrete continuous box girder construction, the construction method of particularly bridge Overall Steel Formwork assembly, concreting and prestressing stretching technique.

Background technology

Present stage, in order to make bridge have better view, adopts fish-belly box beam bridges more.This is because fish-belly box beam bridge has feature handsome in appearance, meet bridge Aesthetics Design.Common fish-belly continuous box beam mostly is uiform section, in box girder construction, the assembly of template is comparatively regular, reinforcing bar binding, concrete construction are also fairly simple, and variable cross-section fish-belly continuous box beam is irregular because of its cross section, the assembly of template is complex, reinforcement fabrication and colligation difficulty are also higher, concrete build and prestressed stretch-draw difficulty is also bigger.Therefore we are in the urgent need to one variable cross-section fish-belly continuous box beam construction method simply and easily.

Summary of the invention

It is an object of the invention to provide one prestress concrete variable cross-section fish-belly continuous box beam construction method simply and easily.

The technical solution adopted in the present invention is:

A kind of prestress concrete variable cross-section fish-belly continuous box beam construction method, including following four partial contents:

Box girder formwork assembly part

Unwrapping wire is first carried out before assembly, in splice point setting-out to support, after then the bottom die of box-beam piecemeal suppressed has been spliced by order on bed die support by number, adjacent tank beam bottom board will be carried out bolt and/or be welded to connect, seam crossing carries out joint filling, it is ensured that the smooth imporosity of adjacent tank beam bottom board;Box beam side form is connected with bottom die of box-beam by bolt;It is supported consolidation process, it is ensured that box girder formwork stability in the large outside box beam side form;Adopting this assembly can be accurately positioned box girder formwork installation site, enhance the stability in the large of box girder formwork, box girder formwork seam crossing is smooth seamless, it is ensured that show impression quality after tearing film open;

Reinforcing bar binding and preformed hole part is set

First box beam base plate arch steel and web reinforcement being carried out colligation, longitudinal reinforcement carries out two-sided overlap welding welding;After reinforcing bar binding completes, prestress hole is positioned, carry out corrugated tube at location place and bury underground, by corrugated tube pre-buried for presstressed reinforcing steel traverse;Make construction become convenient, fast, improve efficiency of construction, also ensure that construction quality;Stability in the large is improve, it is ensured that prestress hole position accurate by welding;

Box beam base plate and web concrete build part

Adopting secondary casting craft, can control concrete pouring construction quality, first time is poured into base plate to median septum ribbing place 500mm, and second time builds median septum and top board;When building, concrete carries out to two ends in the middle part of box beam every time, adopts oblique segmentation, and the method for horizontal slice is built;For preventing inner membrance from moving in casting process, symmetrical balance when box girder web is built, is taked to build;Reduce the use of box girder formwork and support, and pass through the temperature stress impact on distress in concrete of this process known, it is ensured that construction quality;

Tension of prestressed tendon, mud jacking and sealing off and covering anchorage part

Starting dual control method stretch-draw after concrete strength reaches the 90% of design, based on tension stress, stretch value is checked, and accurately controls each classification tension force, measures corresponding elongation and records and calculate, actual elongation value and theoretic elongation being controlled in 6% scope;Prevent from beam body concrete from producing overstressing, component not reverse and lateral bending, framework invariant position;

Mud jacking is the final step of pre-stress construction, closely knit for ensureing hole path pressure grouting, after corrugated tube is rinsed, pure slurry is sprayed into corrugated tube by mud jacking mouth, after the discharge outlet of corrugated tube sprays pure slurry, treat that rear enclosed corrugated tube air vent stablized by the pure slurry in corrugated tube, carry out being forced into after 0.6Mpa continues 5 minutes and close mud jacking mouth, then build sealing off and covering anchorage concrete.

Further scheme is, builds in part in box beam base plate and web concrete, and each lift height is 300mm, and each section length is 3m.

Further scheme is, takes symmetrical balance to build when web is built.

Further scheme is, after concrete strength reaches 75%, inner membrance and box beam side form to box beam are removed, and concrete carries out after dismounting watering maintenance.

In the present invention, before template assembly, first carry out setting up and carrying out precompressed of support.Support takes segmentation to install, first through cure process and plank is laid at surface of base, plank is set up total sub-semigroup as support, as steel-pipe pile support can be set up in water as support, then according to variable cross-section fish-belly continuous box beam Cross section Design line style, it is fabricated to meet linear cambered surface sizing steelframe with I-steel, channel-section steel, is placed in the top of support.On cambered surface shapes steelframe, bed die support is set.

In the present invention, carrying out inner membrance installation after the whole installation of baseplate reinforcing bar, web reinforcement and presstressed reinforcing steel, for ensureing interior film-strength and rigidity, inner formword uses little punching block and multilayer composite sheet.After box beam base plate and web concrete are built, carry out box beam roof steel bar and box beam wing plate reinforcing bar binding, during roof steel bar colligation, note reserved people hole site, after facilitating concrete formation, remove internal mold.After box beam roof steel bar and box beam wing plate reinforcing bar binding complete, carrying out second coagulation soil pouring construction, carry out to two ends in the middle part of box beam, segmentation is built, and carries out maintenance after having built on time, covers in time and prevents moisture from evaporating.When all concretings of box beam are complete, after concrete strength reaches 75%, inner membrance and box beam side form and dismountable, carry out watering maintenance after dismounting.The dismounting of support and bed die can be carried out when prestress hole path pressure grouting intensity reaches more than the 80% of design strength, dismounting order is: dismantled to span centre by bridge pier, and dismounting has certain time interval every time, is tightened by loosening rod member during interval, beam body is made to implement, it is ensured that dismounting safety.

The present invention compared with prior art, has following main beneficial effect:

The present invention, by arrangement of reasonably constructing, makes construction become convenient, fast, improves efficiency of construction, also ensure that construction quality;

Template and support thereof have enough intensity, rigidity and stability, it is possible to bear young concrete weight and lateral pressure and various construction loads;

Improve the utilization rate of template, greatly saved cost, decrease the time because template deformation spends, shorten the duration;

Utilize punching block steel plate (box girder formwork employing steel plate) to construct, reduce the use of timber, it is achieved real green construction;

After form removal handsome in appearance, save the workload of secondary decoration, preferably resolve the construction difficult problem of prestress concrete variable cross-section fish-belly box beam.

Accompanying drawing explanation

Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:

Fig. 1 is the generalized section of the present invention;

Fig. 2 is the construction schematic diagram of the present invention;

Fig. 3 is the construction schematic diagram of the present invention;

Fig. 4 is that the present invention has constructed rear structural representation;

Fig. 5 is box beam base plate of the present invention and web concrete pouring construction detail drawing.

In figure: 1, total sub-semigroup;2, sizing steelframe;3, bed die;4, box beam side form;5, internal mold;6, bed die support;7, first time builds;9, variable cross-section fish-belly box beam, 10, build cut-off rule, 11, second time builds.

Detailed description of the invention

In order to make the purpose of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the present invention, is not intended to limit the present invention.

Referring to Fig. 1-Fig. 5, a kind of prestress concrete variable cross-section fish-belly continuous box beam construction method, comprise the steps:

1, set up support, carry out precompressed

Support takes segmentation to install, first through cure process and plank is laid at surface of base, plank is set up total sub-semigroup as support, as steel-pipe pile support can be set up in water as support, then according to variable cross-section fish-belly continuous box beam Cross section Design line style, it is fabricated to meet linear cambered surface sizing steelframe with I-steel, channel-section steel, is placed in the top of support;On cambered surface shapes steelframe, bed die support is set;

2, template assembly construction

Unwrapping wire is first carried out before assembly, in splice point setting-out to support, after then the bottom die of box-beam piecemeal suppressed has been spliced by order on bed die support by number, adjacent tank beam bottom board will be carried out bolt and/or be welded to connect, seam crossing carries out joint filling, it is ensured that the smooth imporosity of adjacent tank beam bottom board;Box beam side form is connected with bottom die of box-beam by bolt;It is supported consolidation process, it is ensured that box girder formwork stability in the large outside box beam side form;Adopting this assembly can be accurately positioned box girder formwork installation site, enhance the stability in the large of box girder formwork, box girder formwork seam crossing is smooth seamless, it is ensured that show impression quality after tearing film open;

3, reinforcing bar binding, inner membrance are installed and arrange preformed hole

Processing due to box beam base plate arch steel, the processing of web arch steel skeleton reinforcing steel bar and space orientation, the joint reasonable layout of longitudinal reinforcement, all difficulty is bigger in the colligation etc. of labyrinth reinforcing bar, and reinforcing bar is comparatively dense, therefore construct and carry out in two stages, first carry out box beam baseplate reinforcing bar and box girder web reinforcing bar binding, the two-sided overlap welding welding of longitudinal reinforcement, box beam baseplate reinforcing bar, box girder web reinforcing bar, after longitudinal reinforcement colligation completes, start to position the locus of prestress hole, carry out corrugated tube at location place to bury underground, carry out corrugated tube after burying underground reinforcing and fix, then carry out presstressed reinforcing steel perforation and be fixed;Carrying out inner membrance installation after the whole installation of baseplate reinforcing bar, web reinforcement and presstressed reinforcing steel, for ensureing interior film-strength and rigidity, inner formword uses little punching block and multilayer composite sheet;Construction space is open, makes construction become convenient, fast, improves efficiency of construction, also ensure that construction quality;Stability in the large is improve, it is ensured that prestress hole position accurate by welding;

4, box beam base plate and box girder web concreting

Due to generally highly higher in the middle part of fish-belly box beam, the bad control of concrete one-time-concreting construction quality, so adopting secondary casting craft to carry out box beam base plate, box girder web concreting, first time is poured into base plate to median septum ribbing place 500mm, and second time builds median septum and top board;Each concreting adopts and carries out to two ends in the middle part of box beam, and oblique segmentation, the method for horizontal slice is built, and lift height is 300mm, and section length is 3m;For preventing inner membrance from moving in casting process, symmetrical balance when box girder web is built, is taked to build;

5, box beam roof steel bar, box beam wing plate reinforcing bar binding

Box beam base plate and box girder web concreting carry out box beam roof steel bar and box beam wing plate reinforcing bar binding after completing, and note reserved people hole site during roof steel bar colligation, remove inner membrance after facilitating concrete formation;

6, box beam wing plate, box beam concrete roof are built and maintenance

Box beam roof steel bar, box beam wing plate reinforcing bar binding carry out concrete pouring construction, carry out to two ends in the middle part of box beam after completing, and segmentation is built, and carry out maintenance after having built on time, cover in time and prevent moisture from evaporating;

7, inner membrance, box beam side form are removed:

After concrete strength reaches 75%, inner membrance and box beam side form and dismountable, carry out watering maintenance after dismounting;

8, tension of prestressed tendon, mud jacking and sealing off and covering anchorage:

Tension of prestressed tendon is construction key, concrete strength reach design 90% after start stretch-draw, stretch-draw adopts dual control, and based on tension stress, stretch value is checked, and accurately controls each classification tension force, measures corresponding elongation and records and calculating;Guarantee that actual elongation value and theoretic elongation control in 6% scope;In stretching process, accurately control each classification tension force, it is prevented that beam body concrete produces overstressing, component and do not reverse and lateral bending, framework invariant position, it is ensured that stretch-draw effect;Mud jacking is the final step of pre-stress construction, and after being rinsed by corrugated tube, mud jacking sprays pure slurry to discharge outlet and stablizes rear enclosed corrugated tube air vent, carries out being forced into after 0.6Mpa continues 5 minutes and closes mud jacking mouth, then builds sealing off and covering anchorage concrete;

9, the dismounting of support and bed die

The dismounting of support and bed die can be carried out when prestress hole path pressure grouting intensity reaches more than the 80% of design strength, dismounting order is: dismantled to span centre by bridge pier, and dismounting has certain time interval every time, is tightened by loosening rod member during interval, beam body is made to implement, it is ensured that dismounting safety.

The present invention not only guarantees construction quality, and handsome in appearance after form removal, saves the workload of secondary decoration, preferably resolves the construction difficult problem of prestress concrete variable cross-section fish-belly box beam.

It should be appreciated that for those of ordinary skills, it is possible to improved according to the above description or converted, and all these are improved and convert the protection domain that all should belong to claims of the present invention.

Claims (4)

1. a prestress concrete variable cross-section fish-belly continuous box beam construction method, it is characterised in that include following four partial contents:
Template assembly part
Unwrapping wire is first carried out before assembly, in splice point setting-out to support, after then the bottom die of box-beam piecemeal suppressed has been spliced by order on bed die support by number, adjacent tank beam bottom board will be carried out bolt and/or be welded to connect, seam crossing carries out joint filling, it is ensured that the smooth imporosity of adjacent tank beam bottom board;Box beam side form is connected with bottom die of box-beam by bolt;
Reinforcing bar binding and preformed hole part is set
First box beam base plate arch steel and web reinforcement being carried out colligation, longitudinal reinforcement carries out two-sided overlap welding welding;After reinforcing bar binding completes, prestress hole is positioned, carry out corrugated tube at location place and bury underground, by corrugated tube pre-buried for presstressed reinforcing steel traverse;
Box beam base plate and web concrete build part
Adopting secondary casting craft, first time to be poured into base plate to median septum ribbing place 500mm, second time builds median septum and top board;When building, concrete carries out to two ends in the middle part of box beam every time, adopts oblique segmentation, and the method for horizontal slice is built;
Tension of prestressed tendon, mud jacking and sealing off and covering anchorage part
Starting dual control method stretch-draw after concrete strength reaches the 90% of design, based on tension stress, stretch value is checked, and accurately controls each classification tension force, actual elongation value and theoretic elongation is controlled in 6% scope;
Mud jacking is the final step of pre-stress construction, and after being rinsed by corrugated tube, mud jacking sprays pure slurry to discharge outlet and stablizes rear enclosed corrugated tube air vent, carries out being forced into after 0.6Mpa continues 5 minutes and closes mud jacking mouth, then builds sealing off and covering anchorage concrete.
2. method according to claim 1, it is characterised in that: building in part in box beam base plate and web concrete, each lift height is 300mm, and each section length is 3m.
3. method according to claim 1 or 3, it is characterised in that: take symmetrical balance to build when web is built.
4. method according to claim 1, it is characterised in that: after concrete strength reaches 75%, inner membrance and box beam side form to box beam are removed, and concrete carries out after dismounting watering maintenance.
CN201610101083.2A 2016-02-24 2016-02-24 Prestress concrete variable cross-section fish-belly continuous box beam construction method CN105714684B (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106758742A (en) * 2016-12-29 2017-05-31 中国冶集团有限公司 A kind of curved variable cross-section fish-bellied type Steel Continuous Box beam and its construction method
CN107354872A (en) * 2017-08-16 2017-11-17 中国冶集团有限公司 A kind of variable cross-section fish-bellied type cast-in-situ box girder concrete faulting of slab ends control structure and construction method
CN108560426A (en) * 2018-05-21 2018-09-21 江苏省交通工程集团有限公司 Prevent floating construction method in combined box beam internal model
CN108677743A (en) * 2018-08-13 2018-10-19 司永艳 A kind of concrete cast-in-situ box girder construction method of viaduct
CN108842592A (en) * 2018-06-09 2018-11-20 中交航局第工程有限公司 200 metre hole road box beams of one kind and its segmentation casting method
CN109352285A (en) * 2018-11-30 2019-02-19 中国冶集团有限公司 A kind of production method of hyperboloid fish-belly continuous box beam Variable Section Steel template
CN110468720A (en) * 2019-08-29 2019-11-19 中国十七冶集团有限公司 A kind of construction method of analyzing self-anchored suspension bridge girder integral type placement layer by layer
CN110700103A (en) * 2019-10-16 2020-01-17 中铁工程服务有限公司 Construction method of continuous composite beam

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CN203947404U (en) * 2014-06-09 2014-11-19 宁夏众诚科创信息科技有限公司 A kind of Prestressed Continuous steel structure bridge

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CN103065035A (en) * 2012-09-29 2013-04-24 长沙理工大学 Design method for longitudinal pre-stressing tendons of variable-cross-section pre-stressed concrete continuous bridge
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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106758742A (en) * 2016-12-29 2017-05-31 中国冶集团有限公司 A kind of curved variable cross-section fish-bellied type Steel Continuous Box beam and its construction method
CN106758742B (en) * 2016-12-29 2019-08-23 中国一冶集团有限公司 A kind of curved variable cross-section fish-bellied type Steel Continuous Box beam and its construction method
CN107354872A (en) * 2017-08-16 2017-11-17 中国冶集团有限公司 A kind of variable cross-section fish-bellied type cast-in-situ box girder concrete faulting of slab ends control structure and construction method
CN108560426A (en) * 2018-05-21 2018-09-21 江苏省交通工程集团有限公司 Prevent floating construction method in combined box beam internal model
CN108842592A (en) * 2018-06-09 2018-11-20 中交航局第工程有限公司 200 metre hole road box beams of one kind and its segmentation casting method
CN108677743A (en) * 2018-08-13 2018-10-19 司永艳 A kind of concrete cast-in-situ box girder construction method of viaduct
CN109352285A (en) * 2018-11-30 2019-02-19 中国冶集团有限公司 A kind of production method of hyperboloid fish-belly continuous box beam Variable Section Steel template
CN110468720A (en) * 2019-08-29 2019-11-19 中国十七冶集团有限公司 A kind of construction method of analyzing self-anchored suspension bridge girder integral type placement layer by layer
CN110700103A (en) * 2019-10-16 2020-01-17 中铁工程服务有限公司 Construction method of continuous composite beam

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