CN101550675B - Corrugated steel ventral shield preflex composite beam and construction method thereof - Google Patents

Corrugated steel ventral shield preflex composite beam and construction method thereof Download PDF

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Publication number
CN101550675B
CN101550675B CN2009100264969A CN200910026496A CN101550675B CN 101550675 B CN101550675 B CN 101550675B CN 2009100264969 A CN2009100264969 A CN 2009100264969A CN 200910026496 A CN200910026496 A CN 200910026496A CN 101550675 B CN101550675 B CN 101550675B
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China
Prior art keywords
steel plate
corrugated steel
ventral shield
flange steel
flange
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CN2009100264969A
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Chinese (zh)
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CN101550675A (en
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杨明
黄侨
叶见曙
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东南大学
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Abstract

The invention relates to a bridge composite beam structure, in particular to a corrugated steel ventral shield preflex composite beam and a construction method thereof. The corrugated steel ventral shield preflex composite beam consists of an I-shaped girder provided with a corrugated steel ventral shield, and reinforced concrete boards coated outside the margin plates of the upper and the lower wings of the I-shaped girder. The corrugated steel ventral shield preflex composite beam can be applied to urban interchange engineering and high-speed railway bridge engineering. As the rigidity of the longitudinal bridge direction of the corrugated steel ventral shield is very small, which can not absorb preflex force when preflexing the girder, the loss of prestress of the structure under shrinkage and creep effects can be reduced; the excellent shear resistance bearing capacity of the corrugated steel ventral shield avoids cracks of the ventral shield, and the durableness of the structure is good; moreover, the invention also provides the construction method of the corrugated steel ventral shield preflex composite beam.

Description

A kind of corrugated steel ventral shield preflex composite beam and job practices thereof

Technical field

The present invention relates to a kind of bridge combined beam structure, relate in particular to a kind of corrugated steel ventral shield preflex composite beam and job practices thereof.

Background technology

Pre-bent Combination Beam is a kind of structure of distinct characteristics, is applied to medium and small striding in highway directly and the Simple Supported Railway Bridges in bridge engineering usually, also can be used for continuous girder bridge.Compare with the form of structure that prestress box beam, prestressed T beam etc. are common, its steel using amount is big, the single span cost is higher relatively and construction technology is comparatively complicated; But remarkable advantages such as simultaneously it has also that rigidity is big, span ability strong, good endurance, rise-span ratio are little.Before the 1980s,, be difficult in China as bigger structures of this type of steel using amount such as Pre-bent Combination Beam and be able to extensive employing because China's steel output is less.Thereafter along with the increase of steel output, and the improvement of structure design theory, some steel using amounts are big but structural mechanical property is good, the structure of good endurance (for example encased structures, steel concrete combining structure etc.) also begins to be applied and to develop in China.Pre-bent Combination Beam is as a kind of design feature with distinctness of steel concrete combining structure.Though mechanical property is good, comparing with other traditional structures also has weakness and deficiency.At present, this structure is applied to rise-span ratio restriction the have relatively high expectations structure of (as High-speed Railway Bridges) of strict (as mutilevel overpass) or the rigidity of structure comparatively more.For this class formation, Pre-bent Combination Beam not only can well realize its structure function, also has good and economic.Though Pre-bent Combination Beam has many advantages, in recent years at China's slower development.Research for the Pre-bent Combination Beam structure mainly concentrates in minority colleges and universities and the research institution, and the quantity of practical application is also very limited, far fewer than countries such as Belgium, Germany, Japan and France.Trace it to its cause, can be summed up as following 3 points: single span Pre-bent Combination Beam cost is higher relatively; Construction technology is comparatively complicated; Lack corresponding design, job specfication and standard.

Summary of the invention

The technical problem that solves:

The invention provides a kind of corrugated steel ventral shield preflex composite beam, it is higher relatively to have solved above-mentioned described single span Pre-bent Combination Beam cost; Construction technology is comparatively complicated; Lack corresponding design, job specfication and standard.

The present invention is the technical solution problem by the following technical solutions:

The job practices of a kind of corrugated steel ventral shield preflex composite beam of the present invention, step is as follows,

1) adopt welding that top flange steel plate, bottom flange steel plate and corrugated steel web are welded into I-beam;

2) several shear connectors of welding on top flange steel plate and bottom flange steel plate;

3) stride path position apart from beam two ends 1/4 at I-beam and apply vertical pre-bending power;

4) at bottom flange steel plate placed around longitudinal reinforcement and stirrup and build fist stage concrete;

5) treat that fist stage concrete reaches prescribed strength after, discharge pre-bending power;

6) at top flange steel plate placed around longitudinal reinforcement and stirrup and build the second phase and mix earth; After treating that second stage concrete reaches prescribed strength, finish ripple steel web Pre-bent Combination Beam and set up.

The corrugated steel ventral shield preflex composite beam of making by job practices of the present invention, the top flange steel plate that comprises the fist stage concrete that is cast in around the steel plate of bottom flange, links together with second stage concrete, corrugated steel web, corrugated steel web is arranged between bottom flange steel plate and the top flange steel plate, the three forms the I-beam structure, second stage concrete is cast on the steel plate of top flange, or is connected with the upper surface of top flange steel plate.

Beneficial effect

According to such scheme, the invention provides a kind of corrugated steel ventral shield preflex composite beam, to improve the defective that traditional Pre-bent Combination Beam loss of prestress is big, construction technology is complicated, also can reduce rolled steel dosage simultaneously to a certain extent, reduce structural cost.The outer armored concrete slab of frange plate constitutes by the worker's shape girder steel that has corrugated steel web with about being wrapped in steel I-beam in the present invention, can be applicable in city intersection engineering and the High-speed Railway Bridges engineering.Because the vertical bridge of corrugated steel web is very little to rigidity, can not absorb pre-bending power when girder steel pre-bending, also can reduce the loss of prestress of structure under the shrinkage and creep effect, so its prestressing force efficient height; Because therefore corrugated steel web buckling strength height need not in the welding of web place horizontal or longitudinal stiffener when construction, also need not additionally to be provided with direction across bridge and prop up ejection device, so its easy construction, the duration is short; Corrugated steel web adopts steel plate rolling to form, and can be made into the web of uniform section or variable cross-section height easily according to designing requirement; Because this construction pre-stress efficient height, easy construction, its economy also increases.Corrugated steel ventral shield preflex composite beam is done the time spent being subjected to bending load, and moment of flexure is mainly born by the frange plate up and down of steel I-beam and first phase and second stage concrete, and shearing is mainly born by corrugated steel web.The pre-bending power that is added on steel I-beam in advance can be postponed the appearance in beam body crack, helps giving full play to the characteristics of Materials with High Strength.Owing to adopt steel I-beam that structure is applied prestressing force, compare work progresss such as having avoided being provided with prestress pipe, stretch-draw prestressing force steel bundle, anchoring and duct grouting with traditional prestressed reinforced concrete construction simultaneously.And the shear-carrying capacity that corrugated steel web is good has been avoided the web crack, and structure durability is good.

Description of drawings

Fig. 1 structural representation of the present invention;

Fig. 2 cross-sectional view of the present invention;

Fig. 3 vertical view of the present invention;

Fig. 4 structural change diagrammatic sketch of the present invention;

The structural representation of Fig. 5 concrete listrium of the present invention;

Fig. 6 concrete of the present invention does not superscribe edge of a wing steel plate schematic diagram;

1 is that corrugated steel web, 2 is that top flange steel plate, 3 is that bottom flange steel plate, 4 is that shear connector, 5 is that fist stage concrete, 6 is that second stage concrete, 7 is that longitudinal reinforcement, 8 is that stirrup, L are the corrugated steel ventral shield preflex composite beam beam length among the figure, and L/4 is corrugated steel ventral shield preflex composite beam 1/4 place.

The specific embodiment

Specifically the present invention is described in more detail below in conjunction with description of drawings:

Embodiment 1: a kind of corrugated steel ventral shield preflex composite beam, comprise the fist stage concrete 5 that is cast in bottom flange steel plate 3, the top flange steel plate 2 that is connected with second stage concrete 6, also comprise corrugated steel web 1, corrugated steel web 1 is arranged between bottom flange steel plate 3 and the top flange steel plate 2, and the three forms the I-beam structure.

A kind of corrugated steel ventral shield preflex composite beam of the present invention, described second stage concrete 6 is cast on the top flange steel plate 2.

A kind of corrugated steel ventral shield preflex composite beam of the present invention, described second stage concrete 6 is connected with six end faces of top flange steel plate 2.Connecting six end faces is appreciated that into second stage concrete 6 and superscribes edge of a wing steel plate 2.

In erection process, adopt second stage concrete 6 to superscribe 2 needs of edge of a wing steel plate and make mould earlier with top flange steel plate 2 parcels, building second stage concrete 6 then, treat that second stage concrete 6 is dismountable mould after reaching prescribed strength, increase the bulk strength of ripple steel web Pre-bent Combination Beam like this, but construction technology is comparatively complicated, and construction cost is higher.

A kind of corrugated steel ventral shield preflex composite beam of the present invention, described top flange steel plate 2 is provided with shear connector 4 with bottom flange steel plate 3.

A kind of corrugated steel ventral shield preflex composite beam of the present invention, described I-beam structure are the constant equal altitudes beam of building height.

The firm web Pre-bent Combination Beam of a kind of ripple of the present invention, described I-beam structure forms degree of uprising beam by changing the corrugated steel web height.

The job practices of a kind of corrugated steel ventral shield preflex composite beam of the present invention, step is as follows:

1) adopt welding that top flange steel plate 2, bottom flange steel plate 3 are welded into I-beam with corrugated steel web 1;

2) several shear connectors 4 of welding on top flange steel plate 2 and bottom flange steel plate 3;

3) stride path position apart from beam two ends 1/4 at I-beam and apply vertical pre-bending power;

4) at bottom flange steel plate 3 placed around longitudinal reinforcements 7 and stirrup 8 and build fist stage concrete 5;

5) treat that fist stage concrete 5 reaches prescribed strength after, discharge pre-bending power;

6) at top flange steel plate 2 placed around longitudinal reinforcements 7 and stirrup 8 and build the second phase and mix earth 6; After treating that second stage concrete 6 reaches prescribed strength, finish ripple steel web Pre-bent Combination Beam and set up.

Corrugated steel web 1 forms by plain plate is rolling; With corrugated steel web and top flange steel plate 2, when bottom flange steel plate 3 is formed I-beams, can select types of attachment such as the two-sided welding of tongue and groove, high-strength bolt for use; Shear connector 4 can be selected peg connector, rebar connector, PBL (perforate steel plate) connector etc. for use; Fist stage concrete 5 should be selected the concrete that is not less than C40 for use, and second stage concrete 6 should select for use label to be not less than the concrete of C30; Longitudinal reinforcement 7 and stirrup 8 are distributing bar, can adopt R235 (I grade reinforcing steel yield strength 235MPa) and HRB335 distributing bars such as (II grade reinforcing steel yield strength 335MPa) reinforcing bar commonly used.The material of corrugated steel web should be selected Q345, Q390 and Q420 steel such as (low-alloy high-strengths) for use; Upper and lower balsh plate can adopt Q345, Q390 and Q420 steel such as (low-alloy high-strengths).

Embodiment 2: a kind of corrugated steel ventral shield preflex composite beam, comprise the fist stage concrete 5 that is cast in bottom flange steel plate 3, the second stage concrete 6 that is connected top flange steel plate 2, comprise that also corrugated steel web 1, corrugated steel web 1 are arranged between fist stage concrete 5 that is cast in bottom flange steel plate 3 and the second stage concrete 6 that is connected top flange steel plate 2, the three forms the I-beam structure.

A kind of corrugated steel ventral shield preflex composite beam of the present invention, described second stage concrete 6 is cast on the top flange steel plate 2.

A kind of corrugated steel ventral shield preflex composite beam of the present invention, described second stage concrete 6 is connected with top flange steel plate 2 upper surfaces, then adopts second stage concrete 6 not superscribe edge of a wing steel plate 2, only is connected with shear connector 4 on the top flange steel plate 2.

Adopt second stage concrete 6 not superscribe edge of a wing steel plate 2, then need not to make mould, directly pour into a mould second stage concrete in the one side of the shear connector of last a balsh plate 2, the simple cost of construction technology is lower, but the intensity of whole ripple steel web Pre-bent Combination Beam can reduce.

A kind of corrugated steel ventral shield preflex composite beam of the present invention, described top flange steel plate 2 is provided with shear connector 4 with bottom flange steel plate 3.

A kind of corrugated steel ventral shield preflex composite beam that the present invention states, described I-beam structure are the constant equal altitudes beam of building height.

The firm web Pre-bent Combination Beam of a kind of ripple of the present invention, described I-beam structure forms degree of uprising beam by changing the corrugated steel web height.

The construction method step of a kind of corrugated steel ventral shield preflex composite beam of the present invention is as follows:

1) adopt welding that top flange steel plate 2, bottom flange steel plate 3 are welded into I-beam with corrugated steel web 1;

2) several shear connectors 4 of welding on top flange steel plate 2 and bottom flange steel plate 3;

3) stride path position apart from beam two ends 1/4 at I-beam and apply vertical pre-bending power;

4) at bottom flange steel plate 3 placed around longitudinal reinforcements 7 and stirrup 8 and build fist stage concrete 5;

5) treat that fist stage concrete 5 reaches prescribed strength after, discharge pre-bending power;

6) at top flange steel plate 2 placed around longitudinal reinforcements 7 and stirrup 8 and build the second phase and mix earth 6; After treating that second stage concrete 6 reaches prescribed strength, finish ripple steel web Pre-bent Combination Beam and set up.

Corrugated steel web 1 forms by plain plate is rolling; With corrugated steel web and top flange steel plate 2, when bottom flange steel plate 3 is formed I-beams, can select types of attachment such as the two-sided welding of tongue and groove, high-strength bolt for use; Shear connector 4 can be selected peg connector, rebar connector, PBL (perforate steel plate) connector etc. for use; Fist stage concrete 5 should be selected the concrete that is not less than C40 for use, and second stage concrete 6 should select for use label to be not less than the concrete of C30; Longitudinal reinforcement 7 and stirrup 8 are distributing bar, can adopt R235 (I grade reinforcing steel yield strength 235MPa) and HRB335 distributing bars such as (II grade reinforcing steel yield strength 335MPa) reinforcing bar commonly used.The material of corrugated steel web should be selected Q345, Q390 and Q420 steel such as (low-alloy high-strengths) for use; Upper and lower balsh plate can adopt Q345, Q390 and Q420 steel such as (low-alloy high-strengths).

Claims (2)

1. the job practices of a corrugated steel ventral shield preflex composite beam, it is characterized in that: step is as follows,
1) adopt welding that top flange steel plate (2), bottom flange steel plate (3) are welded into I-beam with corrugated steel web (1);
2) go up welding several shear connectors (4) at top flange steel plate (2) and bottom flange steel plate (3);
3) stride path position apart from beam two ends 1/4 at I-beam and apply vertical pre-bending power;
4) at bottom flange steel plate (3) placed around longitudinal reinforcement (7) and stirrup (8) and build fist stage concrete (5);
5) treat that fist stage concrete (5) reaches prescribed strength after, discharge pre-bending power;
6) at top flange steel plate (2) placed around longitudinal reinforcement (7) and stirrup (8) and build the second phase and mix earth (6); After treating that second stage concrete (6) reaches prescribed strength, finish corrugated steel ventral shield preflex composite beam and set up.
2. the corrugated steel ventral shield preflex composite beam of making by the described job practices of claim 1, it is characterized in that: comprise the top flange steel plate (2) that is cast on every side fist stage concrete (5) of bottom flange steel plate (3), links together with second stage concrete (6), corrugated steel web (1), corrugated steel web (1) is arranged between bottom flange steel plate (3) and the top flange steel plate (2), the three forms the I-beam structure, second stage concrete (6) is cast on the top flange steel plate (2), or is connected with the upper surface of top flange steel plate (2).
CN2009100264969A 2009-04-22 2009-04-22 Corrugated steel ventral shield preflex composite beam and construction method thereof CN101550675B (en)

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Publication number Priority date Publication date Assignee Title
KR100958014B1 (en) * 2010-01-29 2010-05-17 박면화 Construction method of steel composite girder bridge
CN102561202B (en) * 2012-02-15 2013-11-13 中南大学 Construction method of preloaded and prestressed bridge
CN102877417B (en) * 2012-10-26 2014-12-03 中铁上海设计院集团有限公司 Anchoring method of girder suspender of continuous camber composite bridge
CN103498527B (en) * 2013-07-18 2015-10-14 浙江中隧桥波形钢腹板有限公司 After Wavelike steel webplate, prestressed combined structure construction technology is shunk in weldering
CN103422618B (en) * 2013-07-18 2016-04-20 浙江中隧桥波形钢腹板有限公司 Wavelike steel webplate steel-concrete combined structure simply supported l beam
CN103422617B (en) * 2013-07-18 2016-04-20 浙江中隧桥波形钢腹板有限公司 The continuous i beam of Wavelike steel webplate steel-concrete combined structure
CN103982004A (en) * 2014-03-31 2014-08-13 浙江杭萧钢构股份有限公司 Steel tube bundle combination structure with I-shaped web
KR101476290B1 (en) * 2014-05-09 2014-12-24 우경기술주식회사 Steel composite PSC corrugated steel plate U girder
CN104988844B (en) * 2015-05-19 2016-08-24 河南省交通规划设计研究院股份有限公司 Two times tensioning prestressing force assembled Wavelike steel webplate combination beam
CN105019595A (en) * 2015-07-30 2015-11-04 东南大学 Corrugated steel web with steel-concrete composite structure
CN106284046A (en) * 2016-10-09 2017-01-04 北京市市政工程设计研究总院有限公司 Bridge steel concrete equals curved combination beam manufacture method

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