CN113062215A - Steel-ultra-high toughness concrete combined bridge deck based on steel bar truss connection - Google Patents

Steel-ultra-high toughness concrete combined bridge deck based on steel bar truss connection Download PDF

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Publication number
CN113062215A
CN113062215A CN202110168553.8A CN202110168553A CN113062215A CN 113062215 A CN113062215 A CN 113062215A CN 202110168553 A CN202110168553 A CN 202110168553A CN 113062215 A CN113062215 A CN 113062215A
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CN
China
Prior art keywords
steel
bridge deck
steel bar
bars
bar truss
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Pending
Application number
CN202110168553.8A
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Chinese (zh)
Inventor
童精中
王国仲
徐世烺
李庆华
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Zhejiang University ZJU
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Zhejiang University ZJU
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Priority to CN202110168553.8A priority Critical patent/CN113062215A/en
Publication of CN113062215A publication Critical patent/CN113062215A/en
Pending legal-status Critical Current

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    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D19/00Structural or constructional details of bridges
    • E01D19/12Grating or flooring for bridges; Fastening railway sleepers or tracks to bridges
    • E01D19/125Grating or flooring for bridges
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D19/00Structural or constructional details of bridges
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D19/00Structural or constructional details of bridges
    • E01D19/08Damp-proof or other insulating layers; Drainage arrangements or devices Bridge deck surfacings
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D19/00Structural or constructional details of bridges
    • E01D19/08Damp-proof or other insulating layers; Drainage arrangements or devices Bridge deck surfacings
    • E01D19/083Waterproofing of bridge decks; Other insulations for bridges, e.g. thermal ; Bridge deck surfacings

Abstract

The invention discloses a steel-ultrahigh toughness concrete combined bridge deck based on steel bar truss connection, which consists of a steel bridge deck top plate, stiffening ribs, upper and lower chord steel bars, web member steel bars, upper and lower connecting steel bars and ultrahigh toughness concrete. The web member steel bars are pressed into wave shape and welded with the upper chord member and the lower chord member by a welding machine, thereby forming a single steel bar truss. The steel bar trusses are continuously arranged side by side along the transverse direction of the bridge deck, and the steel bar trusses are connected into a whole by the upper connecting steel bars and the lower connecting steel bars and then welded with the top plate of the bridge deck to form a steel skeleton. The ultra-high toughness concrete is poured on the bridge deck steel skeleton to play a role in protecting the bridge deck. In the combined bridge deck slab system provided by the invention, the stress mode of the steel bar truss system is reasonable, the steel bar truss system has good integral working performance, and the fatigue performance of the structure is improved while the cost and the construction complexity are reduced.

Description

Steel-ultra-high toughness concrete combined bridge deck based on steel bar truss connection
Technical Field
The invention relates to the technical field of structural engineering, in particular to a steel-ultrahigh-toughness concrete combined bridge deck based on prefabricated steel bar truss system connection.
Background
With the continuous promotion of the infrastructure construction process of China, people realize that the convenience degree of urban internal traffic and urban inter-traffic greatly influences the national economic development and social progress; therefore, the country has realized the big development of road, bridge engineering in recent decades. The bridge structure is not only widely applied to urban overpasses, subway light rails, high-speed railways and the like, but also widely applied to river-crossing and sea-crossing structures. In recent years, with the construction of ultra-large bridge projects such as the mao bridge in hong kong zhu and the mao bridge in hangzhou bay, bridge structures at home and abroad face unprecedented opportunities for development. In the construction of bridge structures, the bridge deck plate not only plays a role in bearing loads such as the dead weight of an upper structure and passing vehicles, but also faces long-term effects such as wheel friction, driving vibration, water and ion erosion, and the like, so that higher requirements are put forward on the bearing capacity, durability and toughness of the bridge deck plate.
The reinforced concrete bridge deck is widely applied in actual engineering, but cannot be applied to bridge structures with large span due to the fact that the self weight of concrete is large and the tensile property of concrete materials is poor. In order to solve the problem, orthotropic steel bridge deck slabs are produced at the same time; the orthotropic bridge deck system formed by arranging longitudinal and transverse stiffening ribs outside the steel bridge deck can obviously improve the bearing efficiency of the bridge deck and the economic span of the structure; however, considering that steel materials are easy to rust when exposed to air for a long time, the durability of the orthotropic bridge deck becomes a problem to be solved urgently in engineering.
In order to solve the problems, a combined bridge deck system is formed by combining steel and concrete materials in engineering, so that the tensile property of the steel and the compressive property of the concrete are fully exerted, and the bearing performance of the structure is further improved. However, the existing steel-concrete composite bridge deck still has some problems: firstly, in order to ensure sufficient shear connection between steel and concrete and prevent the separation of the interface between the steel and the concrete, more studs (playing the double roles of shear resistance and pulling resistance) are usually arranged between the steel and the concrete, so that the construction workload is greatly increased, and the fatigue performance of the structure is influenced due to the existence of welding seams; secondly, the steel deck sections in the composite deck slab usually require a plurality of stiffening ribs to be welded out of plane, which also increases the amount of construction and affects the fatigue performance of the structure; thirdly, the common concrete material is easy to crack after being tensioned and sensitive to local defects, cracks are easy to generate under the action of long-term load, water and ions are corroded, the corrosion resistance and durability of the bridge deck are influenced, the maintenance cost of the bridge structure is obviously increased, and huge waste is caused to manpower and material resources; fourthly, the steel structure parts in the existing combined bridge deck system are usually welded and connected on the construction site, the site workload is large, and the construction quality and precision are difficult to guarantee.
Disclosure of Invention
In order to solve the problems of the traditional steel-concrete combined bridge deck slab system, the invention provides a steel-ultra-high toughness concrete combined bridge deck slab connected based on a prefabricated steel bar truss system.
A steel-ultra-high toughness concrete composite bridge deck based on steel bar truss connection, comprising:
a steel bridge deck top plate;
the steel bar trusses are transversely and continuously placed on the top plate of the steel bridge deck side by side along the bridge deck;
top tie bars (namely upper tie bars) which are fixedly connected with the tops of the steel bar trusses;
bottom tie bars (namely, lower tie bars) which are fixedly connected with the bottoms of the steel bar trusses;
and concrete poured on the steel bar truss.
The following are preferred technical schemes of the invention:
each steel bar truss includes: the steel bridge comprises two symmetrically arranged web member reinforcing steel bars, wherein the web member reinforcing steel bars are wavy, arc-shaped connecting parts are arranged at the bottoms of the waves, the arc-shaped connecting parts are fixed on a steel bridge deck top plate through lower chord reinforcing steel bars, and the tops of the waves of the two web member reinforcing steel bars are fixed through upper chord reinforcing steel bars to form a triangular space truss (namely a steel bar truss).
The plane of the wave shape of the web member steel bar and the plane of the arc-shaped connecting part form an angle of 110-130 degrees (120 degrees).
The lower chord steel bar is pressed on the arc-shaped connecting part of the web member steel bar and is fixed with the arc-shaped connecting part and the steel bridge deck top plate through welding.
The wave-shaped tops of the two web member reinforcing steel bars are fixed after being welded on the upper chord reinforcing steel bar.
The top connecting reinforcing steel bars are fixed on the upper chord reinforcing steel bars through welding, and the top connecting reinforcing steel bars are perpendicular to the upper chord reinforcing steel bars.
The bottom connecting reinforcing steel bars are fixed on the lower chord reinforcing steel bars through welding, and the bottom connecting reinforcing steel bars are perpendicular to the lower chord reinforcing steel bars.
The bottom surface of steel bridge face roof be provided with a plurality of vertical stiffening rib, vertical stiffening rib with the bottom surface of steel bridge face roof is perpendicular.
The top surface of the concrete is higher than the top of the steel bar truss.
In the steel-ultrahigh toughness concrete combined bridge deck based on prefabricated steel bar truss connection, a single steel bar truss consists of upper and lower chord steel bars and two web member steel bars. After being pressed and formed, a single web member reinforcing steel bar can be divided into a main wavy part and a bottom arc part, and the two parts form an angle of 120 degrees with each other in the transverse direction. The two lower chord steel bars are respectively welded at the positions slightly higher than the arc-shaped parts of the bottoms of the two web member steel bars, and the upper chord steel bar is welded between the peaks of the wavy parts of the two web member steel bars, so that a single stable triangular space truss is formed.
In the steel-ultrahigh toughness concrete combined bridge deck based on prefabricated steel bar truss connection, the steel bar trusses are continuously arranged side by side along the transverse direction of a bridge deck, and the upper and lower connecting steel bars connect the steel bar trusses into a whole to form a space steel bar truss system. And welding the arc-shaped part at the bottom of the web member steel bar of the steel bar truss system with the steel bridge deck top plate to form the bridge deck steel framework.
In the steel-ultrahigh toughness concrete combined bridge deck slab connected based on the prefabricated steel bar truss system, ultrahigh toughness concrete is poured on a bridge deck steel framework; the thickness of the ultra-high toughness concrete layer is slightly higher than the height of the prefabricated steel bar truss system, and the effect of protecting the steel skeleton of the bridge deck is achieved.
The ultra-high toughness concrete adopted by the invention comprises cement, an active mineral admixture, aggregate, reinforcing fiber and water, wherein the cement and the active mineral admixture are prepared from the following raw materials in percentage by weight:
further preferably, the concrete adopts the following raw materials in percentage by weight:
the invention provides a steel-ultrahigh toughness concrete combined bridge deck based on prefabricated steel bar truss connection, which is characterized in that a prefabricated steel bar truss system is welded with a steel bridge deck top plate to form a bridge deck steel skeleton, and ultrahigh toughness concrete is cast in situ, and the steel-ultrahigh toughness concrete combined bridge deck has the following advantages:
(1) the adopted ultra-high toughness concrete has high bearing capacity under compression, shows quasi-strain hardening characteristics under tension, can stably reach more than 3 percent under the limit tension strain, only has a plurality of micro-cracks densely distributed under the limit tension strain, can effectively separate steel from the external environment, prevents the steel from being corroded, and improves the toughness, the corrosion resistance and the durability of a bridge deck structure.
(2) The steel bar truss can be prefabricated by a factory, and the steel bar truss has the advantages of high degree of mechanization, high production speed and short construction period, and can effectively avoid the problems that labor loss and construction precision are difficult to guarantee due to the fact that steel bar nets are bound on site and a large number of short studs are welded.
(3) The stress mode of the steel bar truss combined bridge deck is reasonable, and the comprehensive cost advantage can be designed obviously. In order to adapt to different spans, the height and the diameter of the steel bars of the truss can be flexibly adjusted. The steel bar truss system has the initial rigidity after the manufacture in a factory is finished, and the overall rigidity of the combined bridge deck plate can be improved after the steel bar truss is welded with the steel bridge deck plate, so that the number of stiffening ribs can be reduced to a certain extent, the number of welding seams of a steel structure part is reduced, and the fatigue performance of the structure is improved. In addition, because the steel bridge deck top plate can be used as the bottom die, additional support and the bottom die are not needed when concrete is poured in the construction stage, and the cost is reduced.
(4) The interface connection performance of the combined bridge deck can be obviously improved by utilizing a construction mode of welding a prefabricated steel bar truss system on the steel bridge deck. The truss web member reinforcing steel bars can be regarded as shear bars, so that the shearing resistance of the steel bridge deck and the ultra-high toughness concrete interface is enhanced, the steel bridge deck top plate and the ultra-high toughness concrete interface can be prevented from being bonded and sliding, and meanwhile, the truss web member reinforcing steel bars, the upper chord reinforcing steel bars, the lower chord reinforcing steel bars and the upper connecting reinforcing steel bars and the lower connecting reinforcing steel bars can jointly play a vertical anti-pulling role, so that the concrete slab is prevented from being vertically lifted, and the safety of the structure is enhanced.
(5) Compared with the traditional steel-concrete combined bridge deck based on stud connection, the concrete near the root of the stud usually generates local compression cracking under the shearing force effect, and the web member steel bars of the steel bar truss can play a side direction restraining role for the concrete around the stud, so that the compression strength and the ductility of the concrete are improved to a certain degree, the bending resistance bearing capacity and the deformation capacity of the combined bridge deck are improved, and the combined bridge deck has better integral working performance.
(6) The steel bar trusses are continuously arranged side by side along the transverse direction of the bridge deck, and the steel bar trusses are connected into a whole by the upper connecting steel bars and the lower connecting steel bars and then welded with the top plate of the bridge deck to form a steel skeleton. The ultra-high toughness concrete is poured on the bridge deck steel skeleton to play a role in protecting the bridge deck. In the combined bridge deck slab system provided by the invention, the stress mode of the steel bar truss system is reasonable, the steel bar truss system has good integral working performance, and the fatigue performance of the structure is improved while the cost and the construction complexity are reduced.
Drawings
FIG. 1 is a schematic view of a single steel bar truss;
FIG. 2 is a transverse cross-sectional view of a steel-UHC concrete composite deck based on prefabricated steel bar truss connection;
FIG. 3 is a longitudinal sectional view of a steel-UHPC composite decking based on a prefabricated steel bar truss connection;
FIG. 4 is an overall schematic view of a steel-UHPC combined bridge deck steel skeleton based on prefabricated steel bar truss connection;
fig. 5 is a top view of a steel skeleton of a steel-ultra-high toughness concrete composite bridge deck based on prefabricated steel bar truss connection.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1 to 5, a steel-ultra-high toughness concrete composite bridge deck based on steel bar truss connection comprises the following components: the steel bridge deck comprises a steel bridge deck top plate 1, longitudinal stiffening ribs 2, lower chord reinforcing steel bars 3, upper chord reinforcing steel bars 4, web member reinforcing steel bars 5, lower connecting reinforcing steel bars 6, upper connecting reinforcing steel bars 7 and ultrahigh-toughness concrete 8.
As shown in fig. 1, the single web member reinforcing bar 5 after press-forming can be divided into a main wavy portion and a bottom curved portion, which are formed at 120 ° to each other in the lateral direction. Two lower chord steel bars 3 are respectively welded at the positions, slightly higher than the arc-shaped parts, of the bottoms of the wavy parts of the main bodies of the two web member steel bars 5, and an upper chord steel bar 4 is welded between the vertexes of the wavy parts of the two web member steel bars 5, so that a single stable triangular space truss is formed.
As shown in fig. 4, the steel bar trusses (i.e., triangular space trusses) are continuously arranged side by side along the transverse direction of the bridge deck, and the steel bar trusses are connected into a whole by the lower connecting steel bars 6 and the upper connecting steel bars 7 to form a space steel bar truss system. And welding the bottom arc part of the web member steel bar 5 of the steel bar truss system with the steel bridge deck top plate 1 to form a bridge deck steel framework.
As shown in fig. 2 and 3, the ultra-high toughness concrete 8 is poured on the bridge deck steel framework; the thickness of the ultra-high toughness concrete 8 is slightly higher than the height of the prefabricated steel bar truss system, and the ultra-high toughness concrete plays a role in protecting a steel framework of a bridge deck.
The ultra-high toughness concrete comprises the following components of cement, an active mineral admixture, aggregate, fiber and water, wherein the active mineral admixture comprises fly ash, silica fume, granulated blast furnace slag and metakaolin, the maximum particle size of the aggregate is not more than 0.5mm, the fiber adopts one or the combination of more than one of polyvinyl alcohol fiber, polyethylene fiber and aromatic polyamide fiber, the fiber length is 5-25 mm, the diameter is 0.015-0.055 mm, the elastic modulus is 30-150 GPa, the tensile strength is 1000-3500 MPa, the ultimate elongation is 2-15%, and the weight ratio of the cement to the active mineral admixture is as follows:
the performance test of the ultra-high toughness concrete obtained under the mixing proportion shows that the ultimate tensile strain can reach 3.2 percent (about 320 times of the concrete), and the width of a corresponding crack is 0.049mm when the ultimate tensile strain is achieved; the flexural strength was 12.8MPa (about 2 times that of concrete), the uniaxial compressive strength was 48MPa, and the compressive strain corresponding to the peak load was 0.55% (about 2 times that of concrete).
The steel-ultrahigh toughness concrete combined bridge deck based on prefabricated steel bar truss connection provided by the invention has the advantages that the adopted ultrahigh toughness concrete can ensure that no or only micro cracks below 100 micrometers are generated under the actions of pulling, pressing, bending and other various loads, the functions of crack resistance, seepage prevention and corrosion resistance are realized, and the toughness and durability of the structure are obviously improved. The invention adopts the triangular space steel bar truss as the structural mode of interface connection, has reasonable stress mode, excellent interface connection performance, good bearing capacity and deformation capacity, low construction complexity, shortened working period and obvious design comprehensive cost advantage. The height and the diameter of the steel bar of the truss can be flexibly adjusted in order to adapt to different spans; the steel bar truss has considerable initial rigidity after being manufactured in a factory, and the overall rigidity of the combined bridge deck can be greatly improved after the steel bar truss is welded with the steel bridge deck, so that the number of stiffening ribs can be reduced to a certain extent, the number of welding seams of the steel structure part of the bridge deck is reduced, and the fatigue performance of the structure is improved; the web member steel bars of the steel bar truss can be regarded as shear bars, so that the shear resistance of the steel bridge deck and the ultra-high toughness concrete interface is enhanced, the bonding slippage between the steel bridge deck top plate and the ultra-high toughness concrete interface can be ensured, and meanwhile, the web member steel bars, the upper chord steel bars, the lower chord steel bars and the upper and lower connecting steel bars jointly play a vertical anti-pulling role, so that the function of the studs in the combined structure is effectively replaced; the web member steel bars of the steel bar truss can play a role in lateral restraint on the concrete around the web member steel bars, and the compressive strength and the ductility of the concrete are improved to a certain extent, so that the bending resistance bearing capacity and the deformation capacity of the combined bridge deck are improved, and the combined bridge deck has better overall working performance. Research shows that in the traditional steel-concrete combined bridge deck slab, if a complete shear connection effect needs to be realized, the number of the studs in each square meter of the bridge deck slab is different from 20 to 100, the number of the studs is increased along with the increase of factors such as the thickness of a concrete layer, the strength of concrete, external load and the like, and the concrete near the root of the stud usually cracks under local compression under the action of shear force; therefore, the steel-ultra-high toughness concrete combined bridge deck based on the prefabricated steel bar truss connection, provided by the invention, has the advantages that the overall mechanical property, the interface connection property, the deformation property and the durability of the structure are improved, the material cost and the construction complexity are greatly reduced, great economic benefits and social benefits are realized, and the potential of popularization and application in a bridge structure is realized.

Claims (10)

1. A steel-ultra-high toughness concrete combined bridge deck based on steel bar truss connection is characterized by comprising:
a steel bridge deck top plate;
the steel bar trusses are transversely and continuously placed on the top plate of the steel bridge deck side by side along the bridge deck;
connecting and fixing top connecting steel bars at the top of each steel bar truss;
connecting and fixing bottom connecting steel bars at the bottom of each steel bar truss;
and concrete poured on the steel bar truss.
2. The steel-ultra high toughness concrete composite bridge deck based on prefabricated steel bar truss connection as claimed in claim 1, wherein each steel bar truss comprises: the steel bridge comprises two symmetrically arranged web member reinforcing steel bars, wherein the web member reinforcing steel bars are wavy, arc-shaped connecting parts are arranged at the bottoms of the waves, the arc-shaped connecting parts are fixed on a steel bridge deck top plate through lower chord reinforcing steel bars, and the tops of the waves of the two web member reinforcing steel bars are fixed through upper chord reinforcing steel bars.
3. The steel-ultra high toughness concrete composite bridge deck based on the prefabricated steel bar truss connection as claimed in claim 2, wherein the plane of the wave shape of the web member steel bar and the plane of the arc connection part form an angle of 110 ° to 130 °.
4. The steel-ultra high toughness concrete composite bridge deck based on precast steel bar truss connection as claimed in claim 2, wherein the lower chord steel bar is pressed against the arc-shaped connection part of the web member steel bar and fixed to the arc-shaped connection part and the steel deck top plate by welding.
5. The precast steel bar truss connection-based steel-ultra high toughness concrete composite decking of claim 2, wherein the wave-shaped tops of the two web members are fixed by welding to the upper chord members.
6. The precast steel bar truss connection-based steel-ultra high toughness concrete composite decking of claim 2, wherein the top tie bars are fixed to the upper chord bars by welding.
7. The precast steel bar truss connection-based steel-ultra high toughness concrete composite decking of claim 6, wherein the top tie bars are perpendicular to the upper chord bars.
8. The steel-ultra high toughness concrete composite bridge deck based on precast steel bar truss connection as claimed in claim 2, wherein the bottom tie bars are fixed to the lower chord bars by welding.
9. The precast steel bar truss connection-based steel-ultra high toughness concrete composite decking of claim 8, wherein the bottom tie bars are perpendicular to the lower chord bars.
10. The steel-ultra high toughness concrete composite bridge deck based on precast steel bar truss connection as claimed in claim 1, wherein a plurality of longitudinal stiffeners are provided on the bottom surface of the steel deck top plate, and the longitudinal stiffeners are perpendicular to the bottom surface of the steel deck top plate.
CN202110168553.8A 2021-02-07 2021-02-07 Steel-ultra-high toughness concrete combined bridge deck based on steel bar truss connection Pending CN113062215A (en)

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CN202110168553.8A CN113062215A (en) 2021-02-07 2021-02-07 Steel-ultra-high toughness concrete combined bridge deck based on steel bar truss connection

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CN202110168553.8A CN113062215A (en) 2021-02-07 2021-02-07 Steel-ultra-high toughness concrete combined bridge deck based on steel bar truss connection

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201665952U (en) * 2010-04-16 2010-12-08 浙江精工轻钢建筑工程有限公司 Self-supporting floor deck
JP2015031137A (en) * 2013-08-07 2015-02-16 ケンテック株式会社 Deck plate structure
CN205077687U (en) * 2015-10-29 2016-03-09 中冶建工集团有限公司 Steel bar truss floor bearing plate
CN106760117A (en) * 2017-01-16 2017-05-31 河南国隆实业有限公司 Steel bar truss floor support plate and its production technology
CN208844773U (en) * 2018-09-11 2019-05-10 北京智慧云建科技有限公司 A kind of ultra-high performance concrete steel bar girder laminated floor slab
CN209099601U (en) * 2018-09-11 2019-07-12 北京智慧云建科技有限公司 A kind of UHPC ultra-high performance concrete steel bar girder laminated floor slab

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201665952U (en) * 2010-04-16 2010-12-08 浙江精工轻钢建筑工程有限公司 Self-supporting floor deck
JP2015031137A (en) * 2013-08-07 2015-02-16 ケンテック株式会社 Deck plate structure
CN205077687U (en) * 2015-10-29 2016-03-09 中冶建工集团有限公司 Steel bar truss floor bearing plate
CN106760117A (en) * 2017-01-16 2017-05-31 河南国隆实业有限公司 Steel bar truss floor support plate and its production technology
CN208844773U (en) * 2018-09-11 2019-05-10 北京智慧云建科技有限公司 A kind of ultra-high performance concrete steel bar girder laminated floor slab
CN209099601U (en) * 2018-09-11 2019-07-12 北京智慧云建科技有限公司 A kind of UHPC ultra-high performance concrete steel bar girder laminated floor slab

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