CN103696355B - The light-duty combined bridge structure of a kind of superhigh tenacity concrete slab-girder steel - Google Patents

The light-duty combined bridge structure of a kind of superhigh tenacity concrete slab-girder steel Download PDF

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CN103696355B
CN103696355B CN201310749788.1A CN201310749788A CN103696355B CN 103696355 B CN103696355 B CN 103696355B CN 201310749788 A CN201310749788 A CN 201310749788A CN 103696355 B CN103696355 B CN 103696355B
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toughness concrete
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邵旭东
张哲�
黄政宇
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Hunan University
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Abstract

本发明公开了一种超高韧性混凝土板-钢梁轻型组合桥梁结构,该组合桥梁结构主要由钢纵梁、钢横梁和超高韧性混凝土桥面板组成;钢纵梁和钢横梁相互连接构成组合桥梁结构的主梁,超高韧性混凝土桥面板主要由超高韧性混凝土浇筑而成,超高韧性混凝土桥面板内配有纵横向钢筋网;超高韧性混凝土桥面板与钢纵梁的上翼缘板的结合面、超高韧性混凝土桥面板与钢横梁的上翼缘板的结合面均设置有剪力连接件。本发明的组合桥梁结构具有自重轻、抗拉强度优异和耐久性好等优点,能显著提高结构刚度,降低混凝土收缩徐变影响,减少混凝土板接缝数量,有效防止混凝土板裂缝产生。

The invention discloses an ultra-high toughness concrete slab-steel girder light composite bridge structure. The composite bridge structure is mainly composed of steel longitudinal girders, steel cross beams and super high toughness concrete bridge decks; the steel longitudinal girders and steel cross beams are connected to form the composite bridge structure The main girder of the ultra-high toughness concrete bridge deck is mainly cast from ultra-high toughness concrete, and the ultra-high toughness concrete bridge deck is equipped with vertical and horizontal steel mesh; The joint surface and the joint surface of the ultra-high toughness concrete bridge deck and the upper flange plate of the steel beam are all provided with shear connectors. The composite bridge structure of the present invention has the advantages of light weight, excellent tensile strength, good durability, etc., can significantly improve structural rigidity, reduce the impact of concrete shrinkage and creep, reduce the number of concrete slab joints, and effectively prevent concrete slab cracks.

Description

一种超高韧性混凝土板-钢梁轻型组合桥梁结构An ultra-high toughness concrete slab-steel girder light composite bridge structure

技术领域technical field

本发明涉及一种新型的桥梁结构,特别涉及一种轻型钢-混凝土组合桥梁结构。The invention relates to a novel bridge structure, in particular to a light steel-concrete composite bridge structure.

背景技术Background technique

钢-混凝土组合梁桥是将钢梁与混凝土桥面板通过抗剪连接件连接成整体共同受力的桥梁结构形式。相对于钢桥,钢-混凝土组合桥梁截面惯性矩和抗弯承载力均显著提高,且混凝土桥面板对钢梁稳定性的增强使得钢结构材料性能得以充分发挥,大幅降低了钢梁用钢量,减少了材料费用,具有良好的经济性。与混凝土桥梁相比,组合桥梁具有结构尺寸小、自重轻,结构延性好,抗震性能优良,基础造价降低等优点。同时,上部结构梁高的减小,有利于增加桥下净空和降低桥面高程,同时使结构外形更纤细,增强了桥梁的景观效果。The steel-concrete composite girder bridge is a bridge structure in which steel girders and concrete decks are connected through shear connectors to form a whole that bears force together. Compared with steel bridges, steel-concrete composite bridges have significantly improved section moment of inertia and flexural bearing capacity, and the enhanced stability of steel girders by concrete bridge decks enables the performance of steel structure materials to be fully utilized, greatly reducing the amount of steel used for steel girders, reducing The cost of materials is reduced, and it has good economy. Compared with concrete bridges, composite bridges have the advantages of small structural size, light weight, good structural ductility, excellent seismic performance, and reduced foundation cost. At the same time, the reduction of the beam height of the upper structure is beneficial to increase the clearance under the bridge and reduce the elevation of the bridge deck, and at the same time make the structure more slender and enhance the landscape effect of the bridge.

虽然钢-混凝土组合桥梁力学性能和施工性能良好,但也存在一些问题。首先,传统的钢-混凝土组合桥梁中,由于混凝土的抗拉强度较低,为了抵抗轮载应力,混凝土桥面板厚度较大(通常平均厚度在26厘米以上),结构的恒载较大,且随着跨径逐渐增加,恒载占承载力比重进一步加大。其次,在正弯矩作用下,混凝土桥面板处于纵向受压状态,混凝土桥面板作为组合桥梁的受压翼缘共同工作抵抗恒载和活载,受力良好;但在负弯矩作用下,混凝土桥面板处于受拉状态,而混凝土材料抗拉强度低,桥面板很容易开裂。再次,如图1和图2所示,普通的钢-混凝土组合桥梁为了减小混凝土桥面板收缩变形受钢梁约束而导致过大收缩应力的影响,一般采用预制普通混凝土(RC)桥面板5,存放四个月后将RC桥面板预制段51安装至钢梁上,再在钢梁上现浇RC桥面板现浇段52,因而此类组合桥梁结构的纵横向接缝53很多,而接缝又是结构薄弱位置,容易开裂。最后,钢-混凝土组合桥梁负弯矩区(特别是接缝处)的混凝土桥面板受拉开裂后,在使用阶段随材料性能劣化很容易造成混凝土桥面板内钢筋锈蚀、主梁渗水和钢结构生锈等问题,桥梁的耐久性面临巨大隐患,难以满足特大跨径桥梁的要求。因此,如何改进组合桥梁结构混凝土桥面板的力学性能和施工工艺,成为钢-混凝土组合桥梁设计和施工中一项迫切需要解决的问题。Although the mechanical properties and construction performance of steel-concrete composite bridges are good, there are still some problems. First of all, in traditional steel-concrete composite bridges, due to the low tensile strength of concrete, in order to resist the wheel load stress, the thickness of the concrete bridge deck is relatively large (usually the average thickness is more than 26 cm), and the dead load of the structure is relatively large, and As the span gradually increases, the proportion of dead load to bearing capacity further increases. Secondly, under the action of positive bending moment, the concrete bridge deck is in the longitudinal compression state, and the concrete bridge deck works together as the compression flange of the composite bridge to resist dead load and live load, and the force is good; but under the action of negative bending moment, The concrete bridge deck is under tension, and the tensile strength of the concrete material is low, so the bridge deck is easy to crack. Thirdly, as shown in Figure 1 and Figure 2, in order to reduce the impact of excessive shrinkage stress caused by the shrinkage deformation of the concrete deck due to the restraint of the steel girders, ordinary steel-concrete composite bridges generally use prefabricated ordinary concrete (RC) bridge decks5 After four months of storage, the prefabricated section 51 of the RC bridge deck is installed on the steel girder, and then the cast-in-place section 52 of the RC bridge deck is cast on the steel beam. The seam is also the weak position of the structure, which is easy to crack. Finally, after the concrete bridge deck in the negative moment zone (especially at the joint) of the steel-concrete composite bridge is cracked under tension, it is easy to cause corrosion of the steel bars in the concrete bridge deck, water seepage of the main girder, and steel structure due to deterioration of material properties during the service period. Rust and other problems, the durability of the bridge faces huge hidden dangers, and it is difficult to meet the requirements of super-long-span bridges. Therefore, how to improve the mechanical properties and construction technology of composite bridge structure concrete deck has become an urgent problem to be solved in the design and construction of steel-concrete composite bridges.

发明内容Contents of the invention

本发明要解决的技术问题是克服现有技术的不足,为钢混凝土组合桥梁提供一种轻型的、能提高结构刚度和抗拉强度、能降低混凝土收缩徐变影响、减少混凝土板接缝数量、有效防止混凝土板裂缝产生和耐久性好的混凝土桥面板。The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art, and provide a light-weight steel-concrete composite bridge that can improve structural rigidity and tensile strength, reduce the impact of concrete shrinkage and creep, reduce the number of concrete slab joints, Effectively prevent cracks in concrete slabs and have good durability for concrete bridge decks.

为解决上述技术问题,本发明提出的技术方案为:一种超高韧性混凝土板-钢梁轻型组合桥梁结构,所述组合桥梁结构主要由钢纵梁、钢横梁和超高韧性混凝土(SuperToughnessConcrete,简称STC)桥面板组成;所述钢纵梁和钢横梁相互连接构成组合桥梁结构的主梁(钢纵梁与所述钢横梁之间可通过焊接、栓接等方式相连,钢横梁优选采用双面坡口焊与钢纵梁相连),所述超高韧性混凝土桥面板主要由超高韧性混凝土浇筑而成,超高韧性混凝土桥面板内配有纵横向钢筋网;所述超高韧性混凝土桥面板与钢纵梁的上翼缘板的结合面、超高韧性混凝土桥面板与钢横梁的上翼缘板的结合面均设置有剪力连接件使其连接成一整体。本发明提出这种超高韧性混凝土板-钢梁轻型组合桥梁结构可用于特大跨径的梁桥、斜拉桥和悬索桥等工程实践中。In order to solve the above-mentioned technical problems, the technical solution proposed by the present invention is: a super toughness concrete slab-steel girder light composite bridge structure, the composite bridge structure is mainly composed of steel longitudinal girders, steel beams and super toughness concrete (Super Toughness Concrete, STC) bridge deck; the steel longitudinal girders and steel beams are connected to each other to form the main girder of the composite bridge structure (the steel longitudinal girders and the steel beams can be connected by welding, bolting, etc., and the steel beams are preferably double-sided slopes. mouth welded and connected to the steel longitudinal girder), the super-high toughness concrete bridge deck is mainly cast from ultra-high toughness concrete, and the ultra-high toughness concrete bridge deck is equipped with vertical and horizontal reinforcement meshes; the ultra-high toughness concrete bridge deck and The joint surface of the upper flange plate of the steel longitudinal girder, the joint surface of the ultra-high toughness concrete bridge deck and the upper flange plate of the steel beam are all provided with shear connectors to connect them into a whole. The invention proposes that the ultra-high toughness concrete slab-steel girder light composite bridge structure can be used in engineering practices such as beam bridges, cable-stayed bridges and suspension bridges with extra-large spans.

上述的超高韧性混凝土板-钢梁轻型组合桥梁结构中,所述超高韧性混凝土可以为活性粉末混凝土、超高性能纤维增强混凝土、密实配筋水泥基复合材料等,但优选为改性的活性粉末混凝土。该改性的活性粉末混凝土主要是指活性粉末混凝土中掺入有不同尺寸和/或外形的镀铜高强钢纤维(钢纤维抗拉强度超过2800MPa)。该优选的改性活性粉末混凝土可以有效改善STC桥面板的韧性和受拉性能。In the above-mentioned ultra-high toughness concrete slab-steel beam light composite bridge structure, the ultra-high toughness concrete can be active powder concrete, ultra-high performance fiber reinforced concrete, densely reinforced cement-based composite materials, etc., but is preferably modified Reactive powder concrete. The modified reactive powder concrete mainly refers to the copper-plated high-strength steel fibers (steel fiber tensile strength exceeding 2800MPa) mixed with different sizes and/or shapes in the reactive powder concrete. The preferred modified reactive powder concrete can effectively improve the toughness and tensile performance of the STC bridge deck.

上述的超高韧性混凝土板-钢梁轻型组合桥梁结构中,所述的超高韧性混凝土中可掺入两种或两种以上不同尺寸或外形的镀铜高强钢纤维,以改善STC桥面板的韧性和受拉性能;但优选的,所述镀铜高强钢纤维的长度与直径的比例(即长径比)控制为70~100;所述镀铜高强钢纤维的外形包括平直形、带端钩、扭曲形中的两种或多种(参见图3)。更优选的,所述镀铜高强钢纤维选用镀铜高强钢纤维A和镀铜高强钢纤维B两种,所述镀铜高强钢纤维A和所述镀铜高强钢纤维B为以下三种组合中的任意一组:组合一:所述镀铜高强钢纤维A是指长度14mm、直径0.2mm的带端钩镀铜高强钢纤维,所述镀铜高强钢纤维B是指长度30mm、直径0.3mm的平直形镀铜高强钢纤维;组合二:所述镀铜高强钢纤维A是指长度14mm、直径0.2mm的带端钩镀铜高强钢纤维,所述镀铜高强钢纤维B是指长度30mm、直径0.3mm的经冷轧扭加工的扭曲形镀铜高强钢纤维;组合三:所述镀铜高强钢纤维A是指长度14mm、直径0.2mm的平直形镀铜高强钢纤维,所述镀铜高强钢纤维B是指长度30mm、直径0.3mm的带端钩镀铜高强钢纤维;所述镀铜高强钢纤维A和镀铜高强钢纤维B的掺入体积比控制在0.5∶1~1∶0.5,所述镀铜高强钢纤维的总体积掺量为2%~4%。优化级配后的镀铜高强钢纤维可以提高体积掺量,并保证STC材料的和易性,提高抗弯拉强度和韧性。采用优化级配后的变形钢纤维还能在保证和易性及力学性能的前提下,降低体积掺量,并提高STC材料的抗弯拉强度、韧性及施工和易性。所述的超高韧性混凝土采用级配后的变形钢纤维后断裂能为22kJ/m2~45kJ/m2,极限伸长率高达5200×10-6~6500×10-6In the above-mentioned ultra-high toughness concrete slab-steel girder light composite bridge structure, two or more copper-plated high-strength steel fibers of different sizes or shapes can be added to the ultra-high toughness concrete to improve the strength of the STC bridge deck. Toughness and tensile properties; but preferably, the ratio of the length and diameter of the copper-coated high-strength steel fibers (ie aspect ratio) is controlled to be 70 to 100; the shape of the copper-coated high-strength steel fibers includes straight, strip Two or more of end hooks and twisted shapes (see Figure 3). More preferably, the copper-plated high-strength steel fiber is selected from two types of copper-plated high-strength steel fiber A and copper-plated high-strength steel fiber B, and the copper-plated high-strength steel fiber A and the copper-plated high-strength steel fiber B are the following three combinations Any group in: Combination 1: The copper-plated high-strength steel fiber A refers to a copper-plated high-strength steel fiber with an end hook with a length of 14mm and a diameter of 0.2mm, and the copper-plated high-strength steel fiber B refers to a length of 30mm and a diameter of 0.3mm mm straight copper-plated high-strength steel fiber; combination two: the copper-plated high-strength steel fiber A refers to a copper-plated high-strength steel fiber with a length of 14mm and a diameter of 0.2mm, and the copper-plated high-strength steel fiber B refers to A twisted copper-plated high-strength steel fiber with a length of 30 mm and a diameter of 0.3 mm; combination three: the copper-plated high-strength steel fiber A refers to a straight copper-plated high-strength steel fiber with a length of 14 mm and a diameter of 0.2 mm. The copper-plated high-strength steel fiber B refers to a copper-plated high-strength steel fiber with an end hook with a length of 30 mm and a diameter of 0.3 mm; the mixing volume ratio of the copper-plated high-strength steel fiber A and copper-plated high-strength steel fiber B is controlled at 0.5: 1-1:0.5, the total volume content of the copper-plated high-strength steel fiber is 2%-4%. The copper-plated high-strength steel fibers after optimized gradation can increase the volume content, ensure the workability of STC materials, and improve the bending and tensile strength and toughness. The use of deformed steel fibers after optimized grading can also reduce the volume content and improve the bending and tensile strength, toughness and construction workability of STC materials under the premise of ensuring workability and mechanical properties. The fracture energy of the ultra-high toughness concrete using graded deformed steel fibers is 22kJ/m 2 -45kJ/m 2 , and the ultimate elongation is as high as 5200×10 -6 -6500×10 -6 .

上述的超高韧性混凝土板-钢梁轻型组合桥梁结构中,优选的,所述超高韧性混凝土中掺有石棉尾矿酸性浸渣超细粉用以改性STC桥面板的收缩特性;所述石棉尾矿酸性浸渣超细粉的平均粒径为2μm~5μm,石棉尾矿酸性浸渣超细粉的掺入量为超高韧性混凝土组分中胶凝材料(包括水泥、硅灰等活性材料)的10%~25%(质量分数)。掺入石棉尾矿酸性浸渣超细粉改性后,由于超细粉颗粒细,配比含量高,这使得STC材料的自收缩进一步减小,早期强度得到显著提高。In the above-mentioned ultra-high toughness concrete slab-steel girder light composite bridge structure, preferably, the ultra-high toughness concrete is mixed with asbestos tailings acid leaching slag ultrafine powder to modify the shrinkage characteristics of the STC bridge deck; The average particle size of the ultra-fine powder of asbestos tailings acidic leaching slag is 2 μm to 5 μm. material) of 10% to 25% (mass fraction). After being modified by adding asbestos tailings acidic leaching slag superfine powder, the self-shrinkage of the STC material is further reduced and the early strength is significantly improved due to the fine particle size and high proportion of the superfine powder.

上述的超高韧性混凝土板-钢梁轻型组合桥梁结构中,所述钢纵梁既可以是钢板梁,也可以是钢板梁、钢箱梁和钢桁架梁等钢主梁的行车道板(可参见图10、图12和图13);所述行车道板与钢主梁通过焊接、栓接等方式相连。所述钢横梁可以是桁架式或实腹式横向联结系;所述桁架式横向联结系包括K型、X型等桁架梁(可分别参见图14和图15),所述实腹式横向联结系包括I型、工字型等实腹式横梁,且其上翼缘板既可与钢纵梁上翼缘板等高,也可低于钢纵梁的上翼缘板(可分别参见图16和图17)。本发明中,所述钢横梁优选为上翼缘与钢纵梁翼缘等高的工字型实腹式横向联结系,以便于支承STC桥面板而减小桥面板跨径,同时提供更多剪力连接件焊接所需的接触面,增加剪力连接件数量而提高抗剪承载力。In the above-mentioned ultra-high toughness concrete slab-steel girder light composite bridge structure, the steel longitudinal girder can be a steel plate girder, and can also be a roadway plate of steel girders such as steel plate girders, steel box girders, and steel truss girders (see Fig. 10, Fig. 12 and Fig. 13); The roadway slab is connected with the steel girder by means of welding, bolting and the like. The steel crossbeam can be a truss type or a solid web type transverse connection system; the truss type transverse connection system includes K-type, X-type and other truss beams (referring to Fig. 14 and Fig. 15 respectively), and the solid web type transverse connection system The system includes I-shaped, I-shaped and other solid-web beams, and its upper flange plate can be equal to the upper flange plate of the steel longitudinal beam, or lower than the upper flange plate of the steel longitudinal beam (see Figure 16 and Figure 16 respectively). Figure 17). In the present invention, the steel crossbeam is preferably an I-shaped solid-belly transverse connecting system with the same height as the upper flange and the steel longitudinal beam flange, so as to support the STC deck and reduce the span of the bridge deck while providing more shear force The contact surface required for the welding of connectors increases the number of shear connectors to increase the shear bearing capacity.

上述的超高韧性混凝土板-钢梁轻型组合桥梁结构中,更优选的,所述钢横梁沿桥梁纵向密集布置,密集布置优选是指钢横梁的间距为钢纵梁间距的1/3~1/2或3m~6m,这样可显著减小车轮荷载作用下桥面板的内力。当钢纵梁为间距较小的钢板梁时,钢横梁在纵向的间距优选取钢纵梁间距的1/3~1/2;当钢纵梁为间距较大的钢箱梁或钢桁架梁时,钢横梁在纵向的间距优选取3m~6m,这样可以显著减小车轮荷载作用下桥面板的内力。In the above ultra-high toughness concrete slab-steel girder light composite bridge structure, more preferably, the steel beams are densely arranged along the longitudinal direction of the bridge, and the dense arrangement preferably means that the spacing of the steel beams is 1/3 to 1/3 of the spacing of the steel longitudinal beams. /2 or 3m~6m, which can significantly reduce the internal force of the bridge deck under the wheel load. When the steel longitudinal girders are steel plate girders with small spacing, the longitudinal spacing of steel beams is preferably 1/3 to 1/2 of the spacing of steel longitudinal girders; when the steel longitudinal girders are steel box girders or steel truss girders with large spacing In this case, the longitudinal spacing of the steel beams is preferably 3m to 6m, which can significantly reduce the internal force of the bridge deck under the wheel load.

上述的超高韧性混凝土板-钢梁轻型组合桥梁结构中,所述的抗剪连接件包含圆柱头剪力钉、焊接纵横向钢筋网、槽钢、开孔钢板(PBL剪力键)、角钢、L型钢、弯起钢筋、锚环和摩擦型高强螺栓等,优选为圆柱头剪力钉和PBL剪力键。In the above-mentioned ultra-high toughness concrete slab-steel girder light composite bridge structure, the shear connectors include cylindrical head shear studs, welded vertical and horizontal steel mesh, channel steel, perforated steel plate (PBL shear key), angle steel , L-shaped steel, bent steel bars, anchor rings and friction-type high-strength bolts, etc., preferably cylindrical head shear nails and PBL shear keys.

上述的超高韧性混凝土板-钢梁轻型组合桥梁结构中,优选的,所述STC桥面板的厚度较薄,本发明中优选取8cm~16cm,其仅为普通钢-混凝土组合桥梁混凝土桥面板厚度的1/4~1/2,结构自重轻,结构抵抗荷载有效性和跨越能力大;所述STC桥面板内还设置有沿桥梁纵横向的纵横向钢筋网,纵横向钢筋网的单向配筋率优选为3%~6%。In the above-mentioned ultra-high toughness concrete slab-steel girder light composite bridge structure, preferably, the thickness of the STC bridge deck is relatively thin, preferably 8cm to 16cm in the present invention, which is only the concrete bridge deck of an ordinary steel-concrete composite bridge 1/4 to 1/2 of the thickness, the structure has light weight, and the structural load resistance effectiveness and spanning capacity are large; the STC bridge deck is also equipped with vertical and horizontal steel mesh along the vertical and horizontal directions of the bridge, and the vertical and horizontal steel mesh is unidirectional. The reinforcement ratio is preferably 3% to 6%.

上述的超高韧性混凝土板-钢梁轻型组合桥梁结构中,优选的,所述超高韧性混凝土经过了高温蒸汽养护成型,其收缩徐变在蒸养过程中几乎全部完成,后期收缩徐变小,因而STC材料收缩变形受钢板约束影响很小;因此,本发明中可将STC桥面板直接浇筑在钢主梁上,并可在较长的纵向预制节段间设置横向接缝,所述超高韧性混凝土桥面板的横向接缝的间距优选为间距为8m~30m。基于此,本发明优选的组合桥梁结构中,组合结构的接缝数量大幅度减少(甚至桥梁跨径不大时可全跨连续浇注STC桥面板而不设置接缝),结构抗裂安全度与刚度显著提高。本发明中的STC桥面板既可采用现场连续浇注,也可采用工厂标准化节段预制、现场装配并现浇湿接缝的施工工艺,优选为工厂标准化分节段预制、现场装配并现浇湿接缝的施工工艺。In the above-mentioned ultra-high toughness concrete slab-steel girder light composite bridge structure, preferably, the ultra-high toughness concrete has undergone high-temperature steam curing and molding, and its shrinkage and creep are almost completely completed during the steam curing process, and the later shrinkage and creep are small , so the shrinkage deformation of the STC material is very little affected by the constraints of the steel plate; therefore, in the present invention, the STC bridge deck can be directly poured on the steel girder, and transverse joints can be set between the longer longitudinal prefabricated segments. The distance between the transverse joints of the high-toughness concrete bridge deck is preferably 8m to 30m. Based on this, in the preferred combined bridge structure of the present invention, the number of joints of the combined structure is greatly reduced (even when the bridge span is not large, the STC bridge deck can be poured continuously for the whole span without setting the joints), and the structural crack resistance safety degree and Stiffness is significantly increased. The STC bridge deck in the present invention can either adopt on-site continuous casting, or adopt the construction technology of factory standardized segmental prefabrication, on-site assembly and cast-in-place wet joints, preferably factory standardized segmental prefabrication, on-site assembly and cast-in-place wet joints. Seam construction process.

上述的超高韧性混凝土板-钢梁轻型组合桥梁结构中,优选的,所述的STC桥面板的横向接缝可以设置在钢横梁的腹板顶部或钢横梁间的跨中位置;横向接缝设置在钢横梁的腹板顶部时可以进行钢横梁的局部增强,如加宽顶板和焊接纵向加劲板;当横向接缝设置在钢横梁间的跨中位置时,该横向接缝处可以增加横向增强钢板。所述的STC桥面板的横向接缝更优选设置在钢横梁间的跨中位置。通过对横向接缝的位置及接缝局部进行加强处理,不仅可减小接缝的受力、强化增大接缝处的刚度,而且能基本消除STC桥面板接缝开裂的风险。In the above-mentioned ultra-high toughness concrete slab-steel girder light composite bridge structure, preferably, the transverse joint of the STC bridge deck can be arranged at the mid-span position of the web top of the steel beam or between the steel beams; the transverse joint When it is set at the top of the web of the steel beam, local reinforcement of the steel beam can be carried out, such as widening the top plate and welding the longitudinal stiffener; when the transverse joint is set at the mid-span position between the steel beams, the transverse joint can increase the transverse Reinforced steel plate. The transverse joints of the STC bridge deck are more preferably arranged at the mid-span position between the steel beams. By strengthening the position and locality of the transverse joints, not only can the stress on the joints be reduced, the stiffness of the joints can be strengthened, and the risk of cracking of the joints of the STC bridge deck can be basically eliminated.

与现有技术相比,本发明的技术方案具备以下明显的技术优势:Compared with the prior art, the technical solution of the present invention has the following obvious technical advantages:

第一,本发明的超高韧性混凝土板-钢梁轻型组合桥梁结构采用了薄型的STC桥面板,其厚度仅为传统钢-混凝土组合桥梁混凝土桥面板厚度的1/4~1/2,结构自重显著降低,结构抵抗荷载有效性和增大跨越能力大幅提高,这使得本发明的超高韧性混凝土板-钢梁轻型组合桥梁结构成为大跨径桥梁中一种具有应用前景的桥型。First, the ultra-high toughness concrete slab-steel girder light-duty composite bridge structure of the present invention adopts a thin STC bridge deck, and its thickness is only 1/4 to 1/2 of the thickness of the concrete bridge deck of a traditional steel-concrete composite bridge. The self-weight is significantly reduced, and the effectiveness of the structure to resist loads and the ability to increase the span are greatly improved, which makes the ultra-high toughness concrete slab-steel girder light composite bridge structure of the present invention a bridge type with application prospects in long-span bridges.

第二,本发明的超高韧性混凝土板-钢梁轻型组合桥梁结构相比于普通的钢-混凝土组合桥梁,其通过设置密集的钢横梁,减小了车轮荷载作用下的桥面板内力。Second, compared with ordinary steel-concrete composite bridges, the ultra-high toughness concrete slab-steel girder light-duty composite bridge structure of the present invention reduces the internal force of the bridge deck under the wheel load by arranging dense steel beams.

第三,本发明的超高韧性混凝土板-钢梁轻型组合桥梁结构中,STC材料采用不同尺寸或外形的钢纤维进行优化级配改性后,STC断裂能可达22kJ/m2~45kJ/m2、极限伸长率高达5200×10-6~6500×10-6,相对于普通混凝土的断裂能0.12kJ/m2、极限拉应变60×10-6~120×10-6,本发明STC桥面板的抗拉强度高、韧性大,故能更好地承受组合桥梁混凝土桥面板中较大的拉应力或拉应变,防止其受拉破坏。Third, in the ultra-high toughness concrete slab-steel girder light composite bridge structure of the present invention, after the STC material is modified by optimizing the gradation of steel fibers of different sizes or shapes, the STC fracture energy can reach 22kJ/m 2 -45kJ/ m 2 , ultimate elongation as high as 5200×10 -6 to 6500×10 -6 , compared to ordinary concrete with a fracture energy of 0.12kJ/m 2 and ultimate tensile strain of 60×10 -6 to 120×10 -6 , the present invention The STC bridge deck has high tensile strength and high toughness, so it can better withstand the large tensile stress or tensile strain in the concrete deck of composite bridges and prevent it from being damaged by tension.

第四,本发明中优化改性后的超高韧性混凝土相比于普通混凝土,组分中掺入了平均粒径仅2μm~5μm的石棉尾矿酸性浸渣超细粉,该超细粉颗粒细,粉体含量高,因而STC材料的自收缩小,极限拉应变大,显著改善了STC桥面板的收缩特性。Fourth, compared with ordinary concrete, the optimized modified ultra-high toughness concrete in the present invention is mixed with asbestos tailings acidic leaching slag ultrafine powder with an average particle size of only 2 μm to 5 μm. Fine, high powder content, so the self-shrinkage of the STC material is small, and the ultimate tensile strain is large, which significantly improves the shrinkage characteristics of the STC bridge deck.

第五,普通混凝土桥面板收缩变形受钢梁约束的影响较大,故传统的钢-混凝土组合桥梁一般采用自由收缩变形后的预制混凝土桥面板,后期在钢梁上现浇接缝段,因而纵横向接缝很多。而STC桥面板的收缩徐变在高温蒸养强度形成过程中几乎全部完成,后期收缩徐变可忽略不计,因而本发明中STC桥面板收缩变形受钢板约束影响很小,可将其直接浇注在钢梁上,只需在预制节段间设置横向接缝,从而大幅度减少接缝数量,结构抗裂安全性和刚度较普通钢-混凝土桥梁有明显提高。Fifth, the shrinkage deformation of ordinary concrete bridge decks is greatly affected by the constraints of steel girders. Therefore, traditional steel-concrete composite bridges generally use precast concrete bridge decks after free shrinkage deformation, and the joints are cast on the steel beams later, so There are many vertical and horizontal seams. However, the shrinkage and creep of the STC bridge deck is almost completely completed during the formation of the high-temperature steam-cured strength, and the shrinkage and creep in the later stage can be ignored. Therefore, the shrinkage and deformation of the STC bridge deck in the present invention is very little affected by the constraints of the steel plate, and it can be directly cast on On steel beams, only transverse joints need to be set between prefabricated segments, thereby greatly reducing the number of joints, and the structural crack resistance safety and rigidity are significantly improved compared with ordinary steel-concrete bridges.

第六,普通钢-混凝土组合桥梁的纵横向接缝一般设置在钢梁支撑处,负弯矩较大,容易受拉开裂。而本发明中超高韧性混凝土板-钢梁轻型组合桥梁结构现浇段与预制段的横向接缝可灵活设置在钢横梁间拉应力较小处,或设置在钢横梁顶部,通过将钢横梁局部增强,可提高其刚度,降低接缝处应力,因而能显著降低现浇段STC桥面板与预制段STC桥面板间接缝开裂的风险。Sixth, the vertical and horizontal joints of ordinary steel-concrete composite bridges are generally set at the steel beam supports, and the negative bending moment is relatively large, which is easy to crack under tension. In the present invention, the transverse joint between the cast-in-place section and the prefabricated section of the ultra-high toughness concrete slab-steel beam light composite bridge structure can be flexibly arranged at the place where the tensile stress between the steel beams is small, or at the top of the steel beams. Reinforcement can increase its stiffness and reduce the stress at the joints, thus significantly reducing the risk of joint cracking between the cast-in-place STC deck and the prefabricated STC deck.

第七,普通钢-混凝土组合桥梁负弯矩区特别是接缝处的混凝土桥面板受拉开裂后,在使用阶段随材料性能劣化很容易造成混凝土板内钢筋锈蚀,主梁渗水和钢结构生锈等问题;而本发明中的STC桥面板内掺有优化级配后的变形钢纤维,抗拉强度高、韧性大,能承受组合桥梁桥面板中较大的拉应力和拉应变,从而能有效防止桥面板特别是接缝处受拉开裂,且STC材料耐久性优异,寿命可达200年,能有效解决因材料性能随时间退化而引起的上述一系列耐久性问题。Seventh, after the negative bending moment area of ordinary steel-concrete composite bridges, especially the concrete bridge deck at the joints, is stretched and cracked, it is easy to cause corrosion of the steel bars in the concrete slab, water seepage of the main girder and steel structure as the material performance deteriorates during the service stage. problems such as rust; and the STC bridge deck in the present invention is mixed with deformed steel fibers after optimized grading, which has high tensile strength and high toughness, and can bear the larger tensile stress and tensile strain in the composite bridge deck, thereby being able to It can effectively prevent the bridge deck, especially the seams, from cracking under tension, and the STC material has excellent durability, with a lifespan of up to 200 years, which can effectively solve the above-mentioned series of durability problems caused by the degradation of material properties over time.

第八,由于采用了高强高韧、超薄轻型的STC桥面板,本发明的超高韧性混凝土板-钢梁轻型组合桥梁结构较之纯钢梁桥,STC桥面板使截面惯性矩显著增大,结构刚度大幅提高,活载下组合结构的局部挠度明显减小,正交异性钢桥面的疲劳开裂及铺装破损等问题均不复存在。Eighth, due to the adoption of the high-strength, high-toughness, ultra-thin and light STC bridge deck, the ultra-high toughness concrete slab-steel girder light composite bridge structure of the present invention is compared with the pure steel girder bridge, and the STC bridge deck significantly increases the moment of inertia of the section , the structural rigidity is greatly improved, the local deflection of the composite structure under live load is significantly reduced, and the problems of fatigue cracking and pavement damage of the orthotropic steel deck no longer exist.

第九,本发明的超高韧性混凝土板-钢梁轻型组合桥梁结构既可以作为钢主梁承受整体受力,也可以作为钢板梁、钢箱梁和钢桁架梁的行车道板直接承受车辆荷载,结构适用范围广,通用性强。Ninth, the ultra-high toughness concrete slab-steel girder light composite bridge structure of the present invention can be used as a steel girder to bear the overall force, and can also be used as a steel plate girder, steel box girder and steel truss girder to directly bear the vehicle load. Wide application range and strong versatility.

第十,由于本发明中的STC桥面板一方面与钢纵梁和钢横梁形成组合截面共同承担外部荷载,同时提供了正弯矩区钢梁受压翼缘的约束作用,且STC超高的材料抗压强度显著改善了钢梁的受压稳定性,有利于结构性能的充分发挥。Tenth, because the STC bridge deck in the present invention forms a combined section with steel longitudinal girders and steel cross girders to jointly bear external loads, and at the same time provides the restraint effect of the steel girder compression flange in the positive bending moment area, and the super high material resistance of STC The compressive strength significantly improves the compressive stability of steel beams, which is conducive to the full play of structural performance.

第十一,本发明总超高韧性混凝土板-钢梁轻型组合桥梁结构中钢纵梁和钢横梁均通过剪力连接件与STC桥面板形成组合梁,剪力连接件抗剪承载力高,保证了STC桥面板和钢结构结合面可靠连接而不被拉拔掀起。Eleventh, the steel longitudinal girder and the steel beam in the total ultra-high toughness concrete slab-steel girder light composite bridge structure of the present invention form a composite beam through the shear connector and the STC bridge deck, and the shear connector has a high shear bearing capacity, ensuring The STC bridge deck and the joint surface of the steel structure are reliably connected without being pulled up.

最后,本发明的超高韧性混凝土板-钢梁轻型组合桥梁结构易于工厂标准化生产,现场安装质量好,施工速度快,施工费用低。Finally, the ultra-high toughness concrete slab-steel girder light-duty composite bridge structure of the present invention is easy to standardize factory production, has good on-site installation quality, fast construction speed, and low construction cost.

综上,本发明的超高韧性混凝土板-钢梁轻型组合桥梁结构,既具有自重轻、结构强度和刚度大、抗裂安全度高、整体和局部稳定性好、桥面板接缝少、连接性能可靠、施工简便、抗疲劳性能好、耐久性优异和适用范围广等优点,也具有重大的实用价值和良好的经济效益,尤其是在钢-混凝土组合桥梁的施工建造上具有广阔的应用前景。To sum up, the ultra-high toughness concrete slab-steel girder light composite bridge structure of the present invention has the advantages of light weight, high structural strength and rigidity, high crack resistance safety, good overall and local stability, fewer bridge deck joints, and It has the advantages of reliable performance, simple construction, good fatigue resistance, excellent durability and wide application range. It also has great practical value and good economic benefits, especially in the construction of steel-concrete composite bridges. It has broad application prospects. .

附图说明Description of drawings

图1为背景技术中的钢-混凝土组合桥梁结构的立面图。Fig. 1 is an elevation view of a steel-concrete composite bridge structure in the background technology.

图2为背景技术中的钢-混凝土组合桥梁结构的平面图。Fig. 2 is a plan view of a steel-concrete composite bridge structure in the background technology.

图3为本发明中三种不同外形的钢纤维对比结构示意图;其中(a)表示平直形钢纤维,(b)表示带端钩钢纤维,(c)表示扭曲形钢纤维。Fig. 3 is the comparative structural schematic diagram of the steel fiber of three kinds of different profiles in the present invention; Wherein (a) represents straight shape steel fiber, (b) represents band end hook steel fiber, (c) represents twisted shape steel fiber.

图4为本发明实施例1中超高韧性混凝土板-钢梁轻型组合桥梁结构的透视图。Fig. 4 is a perspective view of the ultra-high toughness concrete slab-steel girder light composite bridge structure in Example 1 of the present invention.

图5为本发明实施例1中超高韧性混凝土板-钢梁轻型组合桥梁结构的纵向立面结构示意图。Fig. 5 is a schematic diagram of the vertical elevation structure of the ultra-high toughness concrete slab-steel girder light composite bridge structure in Example 1 of the present invention.

图6为本发明实施例2中超高韧性混凝土板-钢梁轻型组合桥梁结构的纵向立面结构示意图。Fig. 6 is a schematic diagram of the vertical elevation structure of the ultra-high toughness concrete slab-steel girder light composite bridge structure in Example 2 of the present invention.

图7为本发明实施例3中超高韧性混凝土板-钢梁轻型组合桥梁结构的纵向立面结构示意图。Fig. 7 is a schematic diagram of the vertical elevation structure of the ultra-high toughness concrete slab-steel girder light composite bridge structure in Example 3 of the present invention.

图8为图6中C处的局部放大图。FIG. 8 is a partially enlarged view at point C in FIG. 6 .

图9为图7中D处的局部放大图。FIG. 9 is a partially enlarged view at point D in FIG. 7 .

图10为图5中A-A处的剖视图。Fig. 10 is a cross-sectional view at A-A in Fig. 5 .

图11为图5中B-B处的断面图。Fig. 11 is a sectional view at B-B in Fig. 5 .

图12为本发明实施例4中超高韧性混凝土板-钢梁轻型组合桥梁结构的横向截面示意图。Fig. 12 is a schematic transverse cross-sectional view of the ultra-high toughness concrete slab-steel girder light composite bridge structure in Example 4 of the present invention.

图13为本发明实施例中钢纵梁为钢桁架梁的组合桥梁结构的横向截面示意图。Fig. 13 is a schematic transverse cross-sectional view of a composite bridge structure in which the steel longitudinal girder is a steel truss girder in an embodiment of the present invention.

图14为本发明实施例中钢横梁为K型横向联结系的超高韧性混凝土板-钢梁轻型组合桥梁结构的横向截面示意图。Fig. 14 is a schematic transverse cross-sectional view of an ultra-high toughness concrete slab-steel beam light composite bridge structure in an embodiment of the present invention in which the steel beam is a K-type transverse connection system.

图15为本发明实施例中钢横梁为X型横向联结系的超高韧性混凝土板-钢梁轻型组合桥梁结构的横向截面示意图。Fig. 15 is a schematic transverse cross-sectional view of an ultra-high toughness concrete slab-steel beam light composite bridge structure in an embodiment of the present invention in which the steel beam is an X-shaped transverse connection system.

图16为采用工字型横向联结系(钢横梁与钢纵梁的上翼缘等高)的超高韧性混凝土板-钢梁轻型组合桥梁结构的横向截面示意图。Fig. 16 is a schematic transverse cross-sectional view of an ultra-high toughness concrete slab-steel beam light composite bridge structure using an I-shaped transverse connection system (the upper flange of the steel beam and the steel longitudinal beam are of the same height).

图17为采用工字型横向联结系(钢横梁与钢纵梁的上翼缘不等高)的超高韧性混凝土板-钢梁轻型组合桥梁结构的横向截面示意图。Fig. 17 is a schematic transverse cross-sectional view of an ultra-high toughness concrete slab-steel beam light-duty composite bridge structure using an I-shaped transverse connection system (the upper flanges of the steel beam and the steel longitudinal beam are not equal in height).

为了更清晰地表示组合桥梁结构,上述图5~图9中省略了STC桥面板内的横向钢筋,在其余的各横向截面示意图中则省略了STC桥面板内的纵横向钢筋网等。In order to show the combined bridge structure more clearly, the transverse steel bars in the STC deck are omitted in the above-mentioned Figures 5 to 9, and the longitudinal and transverse steel meshes in the STC deck are omitted in the remaining cross-sectional schematic diagrams.

图例说明:illustration:

1、钢纵梁;11、钢纵梁上翼缘板;12、钢纵梁腹板;13、钢纵梁下翼缘板;14、钢箱梁底板;15、钢纵梁侧向加劲板;16、腹板纵向I型加劲肋;17、底板纵向T型加劲肋;18、钢纵梁对接焊缝;2、钢横梁;21、钢横梁上翼缘板;22、钢横梁腹板;23、钢横梁下翼缘板;24、钢横梁加劲板;25、加宽上翼缘板;26、加宽上翼缘板加劲肋;27、局部横向增强钢板;3、超高韧性混凝土(STC)桥面板;31、STC桥面板预制段;32、STC桥面板现浇段;33、STC预制段纵向钢筋;34、STC现浇段纵向连接钢筋;35、横向接缝;4、抗剪连接件;5、普通混凝土桥面板;51、RC桥面板预制段;52、RC桥面板现浇段;53、纵横向接缝;6、纵横向钢筋网。1. Steel longitudinal beam; 11. Upper flange plate of steel longitudinal beam; 12. Web plate of steel longitudinal beam; 13. Lower flange plate of steel longitudinal beam; 14. Bottom plate of steel box girder; 15. Lateral stiffening plate of steel longitudinal beam; 16 1. Longitudinal I-type stiffener of web; 17. Longitudinal T-type stiffener of bottom plate; 18. Butt weld of steel longitudinal beam; 2. Steel beam; 21. Upper flange plate of steel beam; 22. Web of steel beam; 23. Steel beam lower flange plate; 24. Steel beam stiffener plate; 25. Widened upper flange plate; 26. Widened upper flange plate stiffener; 27. Local transverse reinforced steel plate; 3. Super tough concrete (STC) Bridge deck; 31. Prefabricated section of STC bridge deck; 32. Cast-in-place section of STC bridge deck; 33. Longitudinal reinforcement of STC precast section; 34. Longitudinal connecting reinforcement of STC cast-in-place section; 35. Transverse joint; 4. Shear connectors ; 5. Ordinary concrete bridge deck; 51. Prefabricated section of RC bridge deck; 52. Cast-in-place section of RC bridge deck; 53. Vertical and horizontal joints; 6. Vertical and horizontal reinforcement mesh.

具体实施方式detailed description

以下结合说明书附图和具体实施例对本发明的优选技术方案作进一步的描述,但并不因此而限制本发明的保护范围。The preferred technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific examples, but the scope of protection of the present invention will not be limited thereby.

实施例1:Example 1:

如图4、图5、图10和图11所示,一种本发明的超高韧性混凝土板-钢梁轻型组合桥梁结构,该组合桥梁结构主要由钢纵梁1、钢横梁2和超高韧性混凝土桥面板3组成;钢纵梁1和钢横梁2相互连接构成组合桥梁结构的钢主梁。本实施例中的钢纵梁1采用工字型钢板梁,包括钢纵梁上翼缘板11、钢纵梁腹板12和钢纵梁下翼缘板13,钢纵梁1上还设有钢纵梁侧向加劲板15;钢横梁2采用实腹式工字型钢梁,包括钢横梁上翼缘板21、钢横梁腹板22和钢横梁下翼缘板23,钢横梁腹板22上设有钢横梁加劲板24;本实施例中的钢纵梁上翼缘板11与钢横梁上翼缘板21等高。钢横梁2沿桥梁纵向采用密集布置方式,其间距为钢纵梁1间距的1/2;钢横梁2采用双面坡口焊与钢纵梁1相连。超高韧性混凝土桥面板3主要由超高韧性混凝土浇筑而成,超高韧性混凝土桥面板3的厚度为12cm,超高韧性混凝土桥面板3内配有纵横向钢筋网6,单向配筋率控制在3%~6%。超高韧性混凝土桥面板3与钢纵梁上翼缘板11的结合面、超高韧性混凝土桥面板3与钢横梁上翼缘板21的结合面均设置有抗剪连接件4(即剪力连接件)使其连接成一整体。本实施例中的抗剪连接件4采用圆柱头栓钉。As shown in Fig. 4, Fig. 5, Fig. 10 and Fig. 11, a kind of ultra-high toughness concrete slab-steel girder light composite bridge structure of the present invention, this composite bridge structure mainly consists of steel longitudinal girder 1, steel beam 2 and super high The ductile concrete bridge deck 3 is composed; the steel longitudinal girder 1 and the steel cross girder 2 are connected to each other to form the steel girder of the combined bridge structure. Steel longitudinal girder 1 in this embodiment adopts I-shaped steel plate girder, including steel longitudinal girder upper flange plate 11, steel longitudinal girder web plate 12 and steel longitudinal girder lower flange plate 13, steel longitudinal girder 1 is also provided with steel longitudinal girder Beam lateral stiffening plate 15; steel beam 2 adopts solid web type I-shaped steel beam, including steel beam upper flange plate 21, steel beam web 22 and steel beam lower flange plate 23, and steel beam web 22 is provided with There is a steel beam stiffening plate 24; the upper flange plate 11 of the steel longitudinal beam in this embodiment is equal to the upper flange plate 21 of the steel beam. The steel beams 2 are densely arranged along the longitudinal direction of the bridge, and their spacing is 1/2 of the spacing of the steel longitudinal beams 1; the steel beams 2 are connected to the steel longitudinal beams 1 by double-sided groove welding. The ultra-high toughness concrete bridge deck 3 is mainly cast from ultra-high toughness concrete. The thickness of the ultra-high toughness concrete bridge deck 3 is 12cm. Control it at 3% to 6%. The joint surface of the ultra-high toughness concrete bridge deck 3 and the upper flange plate 11 of the steel longitudinal girder, and the joint surface of the ultra-high toughness concrete bridge deck 3 and the upper flange plate 21 of the steel beam are all provided with shear connectors 4 (that is, shear connectors ) to make it connected as a whole. The shear connector 4 in this embodiment adopts cylindrical head bolts.

本实施例的超高韧性混凝土板-钢梁轻型组合桥梁结构中,超高韧性混凝土为改性的活性粉末混凝土,其常规组分为水泥、硅灰、细砂、石英磨细粉、减水剂、早强剂和水等。然而,本实施例的改性活性粉末混凝土特别是指活性粉末混凝土中掺入有两种不同尺寸和不同外形的镀铜高强钢纤维A和镀铜高强钢纤维B用以改善STC桥面板的韧性和受拉性能。镀铜高强钢纤维A是指长度14mm、直径0.2mm(长径比70)的带端钩(端部带弯钩)镀铜高强钢纤维,镀铜高强钢纤维B是指长度30mm、直径0.3mm(长径比100)的平直形镀铜高强钢纤维。镀铜高强钢纤维A占STC材料体积掺量的2%,镀铜高强钢纤维B占STC材料体积掺量的1.5%,两种镀铜高强钢纤维的总体积掺量为3.5%。In the ultra-high toughness concrete slab-steel beam light composite bridge structure of this embodiment, the ultra-high toughness concrete is a modified active powder concrete, and its conventional components are cement, silica fume, fine sand, quartz ground fine powder, water reducing agent, early strength agent and water, etc. However, the modified reactive powder concrete of this embodiment refers to that two kinds of copper-coated high-strength steel fibers A and copper-coated high-strength steel fibers B of different sizes and shapes are mixed in the reactive powder concrete to improve the toughness of the STC bridge deck and tensile properties. Copper-plated high-strength steel fiber A refers to the copper-plated high-strength steel fiber with a length of 14mm and a diameter of 0.2mm (the aspect ratio is 70). mm (length-to-diameter ratio 100) straight copper-coated high-strength steel fibers. Copper-plated high-strength steel fiber A accounts for 2% of the volume of the STC material, copper-plated high-strength steel fiber B accounts for 1.5% of the volume of the STC material, and the total volume of the two copper-plated high-strength steel fibers is 3.5%.

本实施例的超高韧性混凝土板-钢梁轻型组合桥梁结构中还掺有石棉尾矿酸性浸渣超细粉用以改性STC桥面板的收缩特性;石棉尾矿酸性浸渣超细粉的平均粒径为2μm~5μm,石棉尾矿酸性浸渣超细粉的掺入量为超高韧性混凝土组分中胶凝材料(包括水泥、硅灰等活性材料)的15%。掺入石棉尾矿酸性浸渣超细粉改性后,由于超细粉颗粒细,配比含量高,这使得STC材料的自收缩进一步减小,早期强度得到显著提高。The ultra-high toughness concrete slab-steel girder light composite bridge structure of this embodiment is also mixed with asbestos tailings acid leaching slag ultrafine powder to modify the shrinkage characteristics of STC bridge deck; asbestos tailings acid leaching slag ultrafine powder The average particle size is 2 μm to 5 μm, and the amount of superfine powder of asbestos tailings acidic leaching slag is 15% of the cementitious material (including active materials such as cement and silica fume) in the ultra-high toughness concrete component. After being modified by adding asbestos tailings acidic leaching slag superfine powder, the self-shrinkage of the STC material is further reduced and the early strength is significantly improved due to the fine particle size and high proportion of the superfine powder.

本实施例的超高韧性混凝土由高温蒸汽养护(90℃蒸汽养护48小时以上)成型后直接浇筑在钢主梁上。整个超高韧性混凝土桥面板3在桥梁纵向上不设置横向接缝(例如在取经济跨径20m的情况下)。The ultra-high toughness concrete of this embodiment is directly poured on the steel girder after being molded by high-temperature steam curing (90° C. steam curing for more than 48 hours). The entire ultra-high toughness concrete bridge deck 3 is not provided with transverse joints in the longitudinal direction of the bridge (for example, in the case of taking an economical span of 20m).

本实施例的超高韧性混凝土板-钢梁轻型组合桥梁结构采用工厂标准化分节段预制钢结构、现场整体连续浇注STC桥面板的施工工艺。在工厂内首先将钢纵梁上翼缘板11、钢纵梁腹板12和钢纵梁下翼缘板13通过焊接形成标准节段长度的钢纵梁1,同时将钢横梁上翼缘板21、钢横梁腹板22和钢横梁下翼缘板23通过焊接形成标准节段内的钢横梁2,然后通过焊接将钢纵梁1和钢横梁2形成标准节段钢主梁,并在钢纵梁上翼缘板11和钢横梁上翼缘板21上焊接抗剪连接件4。将标准节段焊接的钢结构运至桥梁现场吊装就位后,采用钢纵梁对接焊缝18将相邻两标准节段钢主梁逐段焊接形成桥梁全跨钢结构,然后架立模板并铺筑纵横向钢筋网6,整体连续浇注整跨的STC桥面板层3,现场高温蒸汽养护STC板三天形成强度后拆模,完成施工。The ultra-high toughness concrete slab-steel girder light composite bridge structure of this embodiment adopts the construction technology of factory standardized segmental prefabricated steel structure and on-site integral continuous casting of STC bridge deck. In the factory, first the steel longitudinal beam upper flange plate 11, the steel longitudinal beam web plate 12 and the steel longitudinal beam lower flange plate 13 are welded to form the steel longitudinal beam 1 of standard section length, and the steel beam upper flange plate 21, The web 22 of the steel beam and the lower flange plate 23 of the steel beam are welded to form the steel beam 2 in the standard section, and then the steel longitudinal beam 1 and the steel beam 2 are formed into the steel main beam of the standard section by welding, and the upper wing of the steel longitudinal beam The shear connector 4 is welded on the flange plate 11 and the upper flange plate 21 of the steel beam. After transporting the welded steel structure of the standard segment to the bridge site and hoisting it in place, the steel girders of two adjacent standard segments are welded segment by segment using steel longitudinal girder butt welds 18 to form a full-span steel structure of the bridge, and then the formwork is erected and Lay the vertical and horizontal steel mesh 6, cast the entire span of the STC bridge deck layer 3 continuously, and cure the STC slab with high-temperature steam on site for three days to form strength, then remove the formwork and complete the construction.

实施例2:Example 2:

如图6和图8所示,一种本发明的超高韧性混凝土板-钢梁轻型组合桥梁结构,该组合桥梁结构主要由钢纵梁1、钢横梁2和超高韧性混凝土桥面板3组成;钢纵梁1和钢横梁2相互连接构成组合桥梁结构的钢主梁。本实施例中的钢纵梁1采用工字型钢板梁,包括钢纵梁上翼缘板11、钢纵梁腹板12和钢纵梁下翼缘板13,钢纵梁1上还设有钢纵梁侧向加劲板15;钢横梁2采用实腹式工字型钢梁,包括钢横梁上翼缘板21、钢横梁腹板22和钢横梁下翼缘板23,钢横梁腹板22上设有钢横梁加劲板24;本实施例中的钢纵梁上翼缘板11与钢横梁上翼缘板21等高。钢横梁2沿桥梁纵向采用密集布置方式,其间距为钢纵梁1间距的1/2;钢横梁2采用双面坡口焊与钢纵梁1相连。超高韧性混凝土桥面板3主要由超高韧性混凝土浇筑而成,超高韧性混凝土桥面板3的厚度为12cm,超高韧性混凝土桥面板3内配有纵横向钢筋网6,单向配筋率控制在3%~6%。超高韧性混凝土桥面板3与钢纵梁上翼缘板11的结合面、超高韧性混凝土桥面板3与钢横梁上翼缘板21的结合面均设置有抗剪连接件4(即剪力连接件)使其连接成一整体。本实施例中的抗剪连接件4采用圆柱头栓钉。As shown in Figure 6 and Figure 8, a super-high toughness concrete slab-steel girder light composite bridge structure of the present invention, the composite bridge structure is mainly composed of steel longitudinal girder 1, steel beam 2 and super high toughness concrete bridge deck 3 ; The steel longitudinal girder 1 and the steel cross girder 2 are connected to each other to form the steel girder of the composite bridge structure. Steel longitudinal girder 1 in this embodiment adopts I-shaped steel plate girder, including steel longitudinal girder upper flange plate 11, steel longitudinal girder web plate 12 and steel longitudinal girder lower flange plate 13, steel longitudinal girder 1 is also provided with steel longitudinal girder Beam lateral stiffening plate 15; steel beam 2 adopts solid web type I-shaped steel beam, including steel beam upper flange plate 21, steel beam web 22 and steel beam lower flange plate 23, and steel beam web 22 is provided with There is a steel beam stiffening plate 24; the upper flange plate 11 of the steel longitudinal beam in this embodiment is equal to the upper flange plate 21 of the steel beam. The steel beams 2 are densely arranged along the longitudinal direction of the bridge, and their spacing is 1/2 of the spacing of the steel longitudinal beams 1; the steel beams 2 are connected to the steel longitudinal beams 1 by double-sided groove welding. The ultra-high toughness concrete bridge deck 3 is mainly cast from ultra-high toughness concrete. The thickness of the ultra-high toughness concrete bridge deck 3 is 12cm. Control it at 3% to 6%. The joint surface of the ultra-high toughness concrete bridge deck 3 and the upper flange plate 11 of the steel longitudinal girder, and the joint surface of the ultra-high toughness concrete bridge deck 3 and the upper flange plate 21 of the steel beam are all provided with shear connectors 4 (that is, shear connectors ) to connect them into a whole. The shear connector 4 in this embodiment adopts cylindrical head bolts.

本实施例的超高韧性混凝土板-钢梁轻型组合桥梁结构中,超高韧性混凝土为改性的活性粉末混凝土,其常规组分为水泥、硅灰、细砂、石英磨细粉、减水剂、早强剂和水等。然而,本实施例的改性活性粉末混凝土特别是指活性粉末混凝土中掺入有两种不同尺寸和不同外形的镀铜高强钢纤维A和镀铜高强钢纤维B用以改善STC桥面板的韧性和受拉性能。镀铜高强钢纤维A是指长度14mm、直径0.2mm(长径比70)的带端钩(端部带弯钩)镀铜高强钢纤维,镀铜高强钢纤维B是指长度30mm、直径0.3mm(长径比100)的经冷轧扭加工的扭曲形(变形)镀铜高强钢纤维。镀铜高强钢纤维A占STC材料体积掺量的2%,镀铜高强钢纤维B占STC材料体积掺量的1.5%,两种镀铜高强钢纤维的总体积掺量为3.5%。In the ultra-high toughness concrete slab-steel beam light composite bridge structure of this embodiment, the ultra-high toughness concrete is a modified active powder concrete, and its conventional components are cement, silica fume, fine sand, quartz ground fine powder, water reducing agent, early strength agent and water, etc. However, the modified reactive powder concrete of this embodiment refers to that two kinds of copper-coated high-strength steel fibers A and copper-coated high-strength steel fibers B of different sizes and shapes are mixed in the reactive powder concrete to improve the toughness of the STC bridge deck and tensile properties. Copper-plated high-strength steel fiber A refers to the copper-plated high-strength steel fiber with a length of 14mm and a diameter of 0.2mm (the aspect ratio is 70). mm (length-to-diameter ratio 100) twisted (deformed) copper-plated high-strength steel fibers that have been cold-rolled and twisted. Copper-plated high-strength steel fiber A accounts for 2% of the volume of the STC material, copper-plated high-strength steel fiber B accounts for 1.5% of the volume of the STC material, and the total volume of the two copper-plated high-strength steel fibers is 3.5%.

本实施例的超高韧性混凝土板-钢梁轻型组合桥梁结构中还掺有石棉尾矿酸性浸渣超细粉用以改性STC桥面板的收缩特性;石棉尾矿酸性浸渣超细粉的平均粒径为2μm~5μm,石棉尾矿酸性浸渣超细粉的掺入量为超高韧性混凝土组分中胶凝材料(包括水泥、硅灰等活性材料)的15%。掺入石棉尾矿酸性浸渣超细粉改性后,由于超细粉颗粒细,配比含量高,这使得STC材料的自收缩进一步减小,早期强度得到显著提高。The ultra-high toughness concrete slab-steel girder light composite bridge structure of this embodiment is also mixed with asbestos tailings acid leaching slag ultrafine powder to modify the shrinkage characteristics of STC bridge deck; asbestos tailings acid leaching slag ultrafine powder The average particle size is 2 μm to 5 μm, and the amount of superfine powder of asbestos tailings acidic leaching slag is 15% of the cementitious material (including active materials such as cement and silica fume) in the ultra-high toughness concrete component. After being modified by adding asbestos tailings acidic leaching slag superfine powder, the self-shrinkage of the STC material is further reduced and the early strength is significantly improved due to the fine particle size and high proportion of the superfine powder.

本实施例的超高韧性混凝土由高温蒸汽养护(90℃蒸汽养护48小时以上)成型后直接浇筑在钢主梁上。The ultra-high toughness concrete of this embodiment is directly poured on the steel girder after being molded by high-temperature steam curing (90° C. steam curing for more than 48 hours).

本实施例的超高韧性混凝土板-钢梁轻型组合桥梁结构的STC桥面板横向接缝35设置在钢横梁腹板22上方,横向接缝间距为25m,将STC桥面板预制段31与现浇段32相连,横向接缝35处采用加宽顶板25和焊接纵向局部加劲板26将钢横梁2端部局部增强,以增大接缝处的结构刚度,减小接缝处应力。The STC deck transverse joint 35 of the ultra-high toughness concrete slab-steel girder light composite bridge structure of the present embodiment is arranged on the top of the steel beam web 22, and the transverse joint spacing is 25m. The sections 32 are connected, and the ends of the steel beams 2 are locally reinforced at the transverse joint 35 by widening the top plate 25 and welding longitudinal local stiffening plate 26, so as to increase the structural rigidity at the joint and reduce the stress at the joint.

本实施例的超高韧性混凝土板-钢梁轻型组合桥梁结构采用工厂标准化分节段预制、现场装配并现浇接缝段STC桥面板的施工工艺。在工厂内首先将钢纵梁上翼缘板11、钢纵梁腹板12、钢纵梁下翼缘板13和钢纵梁侧向加劲板15通过焊接形成标准节段长度的钢纵梁1。同时将钢横梁上翼缘板21、钢横梁腹板22、钢横梁下翼缘板23和钢横梁加劲板24通过焊接形成标准节段内钢横梁2,将标准节段端部(钢横梁)加宽上翼缘板25、(钢横梁)加宽上翼缘板加劲肋26、钢横梁腹板22和钢横梁下翼缘板23焊接形成端部钢横梁,然后通过焊接将钢纵梁1、标准节段内钢横梁2以及节段端部钢横梁连接成标准节段钢主梁。在钢纵梁上翼缘板11和钢横梁上翼缘板21上焊接抗剪连接件4,之后在标准节段间立模板绑扎纵横向钢筋网6,并预留STC预制段纵向钢筋33一定长度,以便于现场和STC现浇段纵向连接钢筋34连接成整体。浇注STC桥面板预制段31并高温蒸汽养护三天后拆模形成标准节段的STC板-钢梁轻型组合桥梁结构。将标准节段的STC板-钢梁轻型组合桥梁结构运至现场吊装就位后,通过节段间钢纵梁对接焊缝18将相邻两标准节段的STC板-钢梁轻型组合桥梁结构相连,最后在STC桥面板现浇段32处内铺设纵横向钢筋网,并将STC现浇段纵向连接钢筋34与STC预制段纵向钢筋33预留部分焊接相连,浇注STC桥面板现浇段32内混凝土后高温蒸汽养生,形成强度后脱模即完成施工。The ultra-high toughness concrete slab-steel girder light-duty composite bridge structure of this embodiment adopts the construction technology of factory standardized segmental prefabrication, on-site assembly and cast-in-place joint segment STC bridge deck. In the factory, the upper flange plate 11 of the steel longitudinal beam, the web plate 12 of the steel longitudinal beam, the lower flange plate 13 of the steel longitudinal beam and the lateral stiffening plate 15 of the steel longitudinal beam are firstly welded to form the steel longitudinal beam 1 of standard segment length. At the same time, the upper flange plate 21 of the steel beam, the web plate 22 of the steel beam, the lower flange plate 23 of the steel beam and the stiffening plate 24 of the steel beam are formed by welding the steel beam 2 in the standard section, and the end of the standard section (steel beam) Widened upper flange plate 25, (steel beam) widened upper flange plate stiffener 26, steel beam web 22 and steel beam lower flange plate 23 are welded to form the end steel beam, and then the steel longitudinal beam 1 is welded 1. The steel beam 2 inside the standard segment and the steel beam at the end of the segment are connected to form the steel main beam of the standard segment. The shear connectors 4 are welded on the upper flange plate 11 of the steel longitudinal beam and the upper flange plate 21 of the steel cross beam, and then the vertical and horizontal steel mesh 6 is bound with the vertical formwork between the standard sections, and a certain length of the longitudinal reinforcement 33 of the STC prefabricated section is reserved. In order to facilitate the connection of the field and the STC cast-in-place section longitudinally connecting steel bars 34 into a whole. Cast the prefabricated section 31 of the STC bridge deck and remove the formwork after three days of high-temperature steam curing to form a standard segment STC slab-steel girder light composite bridge structure. After transporting the STC slab-steel girder light-duty composite bridge structure of the standard section to the site for hoisting and placing it in place, the STC slab-steel girder light-duty composite bridge structure of two adjacent standard sections is connected through the butt weld 18 of the inter-segment steel longitudinal girder. Finally, vertical and horizontal reinforcement meshes are laid in the cast-in-place section 32 of the STC bridge deck, and the longitudinal connection reinforcement 34 of the STC cast-in-place section is welded to the reserved part of the longitudinal reinforcement 33 of the STC prefabricated section, and the cast-in-place section 32 of the STC bridge deck is cast. After the inner concrete is cured by high-temperature steam, the construction is completed after demoulding after the strength is formed.

实施例3:Example 3:

如图7和图9所示,一种本发明的超高韧性混凝土板-钢梁轻型组合桥梁结构,该组合桥梁结构主要由钢纵梁1、钢横梁2和超高韧性混凝土桥面板3组成;钢纵梁1和钢横梁2相互连接构成组合桥梁结构的钢主梁。本实施例中的钢纵梁1采用工字型钢板梁,包括钢纵梁上翼缘板11、钢纵梁腹板12和钢纵梁下翼缘板13,钢纵梁1上还设有钢纵梁侧向加劲板15;钢横梁2采用实腹式工字型钢梁,包括钢横梁上翼缘板21、钢横梁腹板22和钢横梁下翼缘板23,钢横梁腹板22上设有钢横梁加劲板24;本实施例中的钢纵梁上翼缘板11与钢横梁上翼缘板21等高。钢横梁2沿桥梁纵向采用密集布置方式,其间距为钢纵梁1间距的1/2;钢横梁2采用双面坡口焊与钢纵梁1相连。超高韧性混凝土桥面板3主要由超高韧性混凝土浇筑而成,超高韧性混凝土桥面板3的厚度为12cm,超高韧性混凝土桥面板3内配有纵横向钢筋网6,单向配筋率控制在3%~6%。超高韧性混凝土桥面板3与钢纵梁上翼缘板11的结合面、超高韧性混凝土桥面板3与钢横梁上翼缘板21的结合面均设置有抗剪连接件4(即剪力连接件)使其连接成一整体。本实施例中的抗剪连接件4采用圆柱头栓钉。As shown in Figures 7 and 9, an ultra-high toughness concrete slab-steel girder light composite bridge structure of the present invention is mainly composed of steel longitudinal beams 1, steel beams 2 and ultrahigh toughness concrete bridge decks 3 ; The steel longitudinal girder 1 and the steel cross girder 2 are connected to each other to form the steel girder of the composite bridge structure. Steel longitudinal girder 1 in this embodiment adopts I-shaped steel plate girder, including steel longitudinal girder upper flange plate 11, steel longitudinal girder web plate 12 and steel longitudinal girder lower flange plate 13, steel longitudinal girder 1 is also provided with steel longitudinal girder Beam lateral stiffening plate 15; steel beam 2 adopts solid web type I-shaped steel beam, including steel beam upper flange plate 21, steel beam web 22 and steel beam lower flange plate 23, and steel beam web 22 is provided with There is a steel beam stiffening plate 24; the upper flange plate 11 of the steel longitudinal beam in this embodiment is equal to the upper flange plate 21 of the steel beam. The steel beams 2 are densely arranged along the longitudinal direction of the bridge, and their spacing is 1/2 of the spacing of the steel longitudinal beams 1; the steel beams 2 are connected to the steel longitudinal beams 1 by double-sided groove welding. The ultra-high toughness concrete bridge deck 3 is mainly cast from ultra-high toughness concrete. The thickness of the ultra-high toughness concrete bridge deck 3 is 12cm. Control it at 3% to 6%. The joint surface of the ultra-high toughness concrete bridge deck 3 and the upper flange plate 11 of the steel longitudinal girder, and the joint surface of the ultra-high toughness concrete bridge deck 3 and the upper flange plate 21 of the steel beam are all provided with shear connectors 4 (that is, shear connectors ) to connect them into a whole. The shear connector 4 in this embodiment adopts cylindrical head bolts.

本实施例的超高韧性混凝土板-钢梁轻型组合桥梁结构中,超高韧性混凝土为改性的活性粉末混凝土,其常规组分为水泥、硅灰、细砂、石英磨细粉、减水剂、早强剂和水等。然而,本实施例的改性活性粉末混凝土特别是指活性粉末混凝土中掺入有两种不同尺寸和不同外形的镀铜高强钢纤维A和镀铜高强钢纤维B用以改善STC桥面板的韧性和受拉性能。镀铜高强钢纤维A是指长度14mm、直径0.2mm(长径比70)的平直形镀铜高强钢纤维,镀铜高强钢纤维B是指长度30mm、直径0.3mm(长径比100)的带端钩(端部带弯钩)镀铜高强钢纤维。镀铜高强钢纤维A占STC材料体积掺量的2%,镀铜高强钢纤维B占STC材料体积掺量的1.5%,两种镀铜高强钢纤维的总体积掺量为3.5%。In the ultra-high toughness concrete slab-steel beam light composite bridge structure of this embodiment, the ultra-high toughness concrete is a modified active powder concrete, and its conventional components are cement, silica fume, fine sand, quartz ground fine powder, water reducing agent, early strength agent and water, etc. However, the modified reactive powder concrete of this embodiment refers to that two kinds of copper-coated high-strength steel fibers A and copper-coated high-strength steel fibers B of different sizes and shapes are mixed in the reactive powder concrete to improve the toughness of the STC bridge deck and tensile properties. Copper-coated high-strength steel fiber A refers to a straight copper-coated high-strength steel fiber with a length of 14mm and a diameter of 0.2mm (aspect ratio of 70). Copper-coated high-strength steel fiber B refers to a length of 30mm and a diameter of 0.3mm (aspect ratio of 100). Copper-plated high-strength steel fibers with end hooks (with hooks at the ends). Copper-plated high-strength steel fiber A accounts for 2% of the volume of the STC material, copper-plated high-strength steel fiber B accounts for 1.5% of the volume of the STC material, and the total volume of the two copper-plated high-strength steel fibers is 3.5%.

本实施例的超高韧性混凝土板-钢梁轻型组合桥梁结构中还掺有石棉尾矿酸性浸渣超细粉用以改性STC桥面板的收缩特性;石棉尾矿酸性浸渣超细粉的平均粒径为2μm~5μm,石棉尾矿酸性浸渣超细粉的掺入量为超高韧性混凝土组分中胶凝材料(包括水泥、硅灰等活性材料)的15%。掺入石棉尾矿酸性浸渣超细粉改性后,由于超细粉颗粒细,配比含量高,这使得STC材料的自收缩进一步减小,早期强度得到显著提高。The ultra-high toughness concrete slab-steel girder light composite bridge structure of this embodiment is also mixed with asbestos tailings acid leaching slag ultrafine powder to modify the shrinkage characteristics of STC bridge deck; asbestos tailings acid leaching slag ultrafine powder The average particle size is 2 μm to 5 μm, and the amount of superfine powder of asbestos tailings acidic leaching slag is 15% of the cementitious material (including active materials such as cement and silica fume) in the ultra-high toughness concrete component. After being modified by adding asbestos tailings acidic leaching slag superfine powder, the self-shrinkage of the STC material is further reduced and the early strength is significantly improved due to the fine particle size and high proportion of the superfine powder.

本实施例的超高韧性混凝土由高温蒸汽养护(90℃蒸汽养护48小时以上)成型后直接浇筑在钢主梁上。The ultra-high toughness concrete of this embodiment is directly poured on the steel girder after being molded by high-temperature steam curing (90° C. steam curing for more than 48 hours).

本实施例的超高韧性混凝土板-钢梁轻型组合桥梁结构的STC桥面板横向接缝35设置在内力较小的钢横梁2间钢纵梁1的跨中位置,并在此处增设局部横向增强钢板27,横向接缝35位于局部横向增强钢板27的正中位置,接缝间距为30m。The STC bridge deck transverse joint 35 of the ultra-high toughness concrete slab-steel girder light composite bridge structure of this embodiment is set at the mid-span position between the steel beams 2 and the steel longitudinal beams 1 with small internal forces, and a local transverse joint is added here For the reinforced steel plate 27, the transverse joint 35 is located in the middle of the local transverse reinforced steel plate 27, and the distance between the joints is 30m.

本实施例的超高韧性混凝土板-钢梁轻型组合桥梁结构采用工厂标准化分节段预制、现场装配并现浇接缝段STC桥面板的施工工艺。在工厂内首先将钢纵梁上翼缘板11、钢纵梁腹板12、钢纵梁下翼缘板13和钢纵梁侧向加劲板15通过焊接形成标准节段长度的钢纵梁1。同时将钢横梁上翼缘板21、钢横梁腹板22、钢横梁下翼缘板23和钢横梁加劲板24通过焊接形成标准节段内钢横梁2,然后通过焊接将钢纵梁1和标准节段内钢横梁2连接成标准节段钢主梁,并在标准节段钢主梁端部上方加焊局部横向增强钢板27且用临时支撑固定。在钢纵梁上翼缘板11、钢横梁上翼缘板21和局部横向增强钢板27上焊接抗剪连接件4,之后在标准节段间立模板绑扎纵横向钢筋网6,并预留STC预制段纵向钢筋33一定长度进入现浇段内,以便在现场和STC现浇段纵向连接钢筋34连接成整体。然后浇注STC桥面板预制段31并高温蒸汽养护三天后,拆除模板和局部横向增强钢板27的临时支撑,形成标准节段的STC板-钢梁轻型组合桥梁结构。将标准节段的STC板-钢梁轻型组合桥梁结构运至现场吊装就位后,通过节段间钢纵梁对接焊缝18将相邻两标准节段的STC板-钢梁轻型组合桥梁结构相连,在STC桥面板现浇段32处铺设纵横向钢筋网,并将STC现浇段纵向连接钢筋34与STC预制段纵向钢筋33预留部分焊接相连,浇注STC桥面板现浇段32内混凝土后高温蒸汽养生,形成强度后脱模即完成施工。The ultra-high toughness concrete slab-steel girder light-duty composite bridge structure of this embodiment adopts the construction technology of factory standardized segmental prefabrication, on-site assembly and cast-in-place joint segment STC bridge deck. In the factory, the upper flange plate 11 of the steel longitudinal beam, the web plate 12 of the steel longitudinal beam, the lower flange plate 13 of the steel longitudinal beam and the lateral stiffening plate 15 of the steel longitudinal beam are firstly welded to form the steel longitudinal beam 1 of standard segment length. At the same time, the upper flange plate 21 of the steel beam, the web plate 22 of the steel beam, the lower flange plate 23 of the steel beam and the stiffening plate 24 of the steel beam are formed by welding the steel beam 2 in the standard section, and then the steel longitudinal beam 1 and the standard section are welded. The steel crossbeams 2 in the section are connected into a standard section steel main beam, and a local transverse reinforced steel plate 27 is welded above the end of the standard section steel main beam and fixed with a temporary support. Weld the shear connectors 4 on the upper flange plate 11 of the steel longitudinal beam, the upper flange plate 21 of the steel cross beam and the local transverse reinforced steel plate 27, and then bind the vertical and horizontal steel mesh 6 with the vertical formwork between the standard sections, and reserve the STC prefabricated section A certain length of the longitudinal steel bar 33 enters the cast-in-place section so as to be integrated with the vertically connecting steel bar 34 of the STC cast-in-place section on site. Then pour the STC bridge deck prefabricated section 31 and after three days of high-temperature steam curing, remove the formwork and the temporary support of the local transverse reinforcement steel plate 27 to form a standard segment STC plate-steel girder light composite bridge structure. After transporting the STC slab-steel girder light-duty composite bridge structure of the standard section to the site for hoisting and placing it in place, the STC slab-steel girder light-duty composite bridge structure of two adjacent standard sections is connected through the butt weld 18 of the inter-segment steel longitudinal girder. Connected, laying vertical and horizontal reinforcement mesh at the cast-in-place section 32 of the STC bridge deck, and welding the longitudinal connection reinforcement 34 of the STC cast-in-place section with the reserved part of the longitudinal reinforcement 33 of the STC prefabricated section, pouring the concrete in the cast-in-place section 32 of the STC bridge deck After the high-temperature steam curing, after the strength is formed, the construction is completed after demoulding.

实施例4:Example 4:

如图12所示,一种本发明的超高韧性混凝土板-钢梁轻型组合桥梁结构,其主要结构、连接方式、施工材料及施工工艺与实施例1、2和3基本相同,其区别仅在于:上述实施例中的钢纵梁采用工字型钢板梁,而本实施例中的钢纵梁1是采用钢箱梁构造,与此相适应,本实施例的钢纵梁1中包括有钢箱梁底板14,且在钢箱梁底板14上设置有底板纵向T型加劲肋17;本实施例的钢纵梁1中不设置上述实施例的钢纵梁侧向加劲板15,而以腹板纵向I型加劲肋16取而代之。As shown in Figure 12, a kind of ultra-high toughness concrete slab-steel girder light composite bridge structure of the present invention, its main structure, connection mode, construction material and construction technology are basically the same as Embodiment 1, 2 and 3, and its difference is only Because: the steel longitudinal girder in the above-mentioned embodiment adopts the I-shaped steel plate girder, and the steel longitudinal girder 1 in the present embodiment adopts the steel box girder structure, adapting to this, the steel longitudinal girder 1 of the present embodiment includes The steel box girder bottom plate 14, and the bottom plate longitudinal T-shaped stiffener 17 is arranged on the steel box girder bottom plate 14; the steel longitudinal beam lateral stiffener plate 15 of the above-mentioned embodiment is not provided in the steel longitudinal beam 1 of the present embodiment, and the Web longitudinal I-type stiffeners 16 instead.

此外,本发明的超高韧性混凝土板-钢梁轻型组合桥梁结构中,钢纵梁还可采用如图13所示钢桁架梁的结构形式。本发明的超高韧性混凝土板-钢梁轻型组合桥梁结构中,钢横梁还可以采用桁架式或实腹式横向联结系;桁架式横向联结系包括如图14所示的K型桁架式横向联结系、如图15所示的X型桁架式横向联结系等,实腹式横向联结系包括I型、工字型等实腹式横梁,且其上翼缘板既可与钢纵梁上翼缘板等高(参见图16),也可低于钢纵梁的上翼缘板(参见图17)。In addition, in the ultra-high toughness concrete slab-steel girder light composite bridge structure of the present invention, the steel longitudinal girder can also adopt the structural form of a steel truss girder as shown in FIG. 13 . In the ultra-high toughness concrete slab-steel girder light composite bridge structure of the present invention, the steel beam can also adopt a truss type or a solid web type lateral connection system; the truss type lateral connection system includes a K-type truss type lateral connection system as shown in Figure 14 system, X-shaped truss-type transverse connection system as shown in Figure 15, etc., the solid-web horizontal connection system includes I-shaped, I-shaped and other solid-web beams, and the upper flange plate can be connected with the upper flange plate of the steel longitudinal beam The same height (see Figure 16), or lower than the upper flange plate of the steel stringer (see Figure 17).

以上所述仅为本发明的几种优选实施例,并不用于限制本发明,对于本领域的技术人员来说,本发明可以有各种更改和变化。凡在本发明技术框架下所作的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。The above descriptions are only several preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made under the technical framework of the present invention shall be included within the protection scope of the present invention.

Claims (9)

1.一种超高韧性混凝土板-钢梁轻型组合桥梁结构,其特征在于:所述组合桥梁结构主要由钢纵梁、钢横梁和超高韧性混凝土桥面板组成;所述钢纵梁和钢横梁相互连接构成组合桥梁结构的主梁,所述超高韧性混凝土桥面板主要由超高韧性混凝土浇筑而成,所述超高韧性混凝土为改性的活性粉末混凝土;该改性的活性粉末混凝土主要是指活性粉末混凝土中掺入有不同尺寸和/或外形的镀铜高强钢纤维;所述超高韧性混凝土中还掺有石棉尾矿酸性浸渣超细粉;所述超高韧性混凝土桥面板内配有纵横向钢筋网;所述超高韧性混凝土桥面板与钢纵梁的上翼缘板的结合面、超高韧性混凝土桥面板与钢横梁的上翼缘板的结合面均设置有剪力连接件;所述超高韧性混凝土经过了高温蒸汽养护成型,所述超高韧性混凝土桥面板不设置接缝或在超高韧性混凝土桥面板的预制节段间仅设置横向接缝。1. a super-high toughness concrete slab-steel girder light composite bridge structure, is characterized in that: described composite bridge structure mainly is made up of steel longitudinal girder, steel crossbeam and superhigh toughness concrete deck; Described steel longitudinal girder and steel crossbeam mutually Connecting the main girders forming the composite bridge structure, the super-high toughness concrete bridge deck is mainly formed by pouring super high toughness concrete, and the super high toughness concrete is modified reactive powder concrete; the modified reactive powder concrete is mainly Refers to the active powder concrete mixed with copper-plated high-strength steel fibers of different sizes and/or shapes; the ultra-high toughness concrete is also mixed with ultra-fine powder of asbestos tailings acid leaching slag; the ultra-high toughness concrete bridge deck Equipped with vertical and horizontal steel mesh; the joint surface of the ultra-high toughness concrete bridge deck and the upper flange plate of the steel longitudinal girder, and the joint surface of the ultra-high toughness concrete bridge deck and the upper flange plate of the steel beam are all provided with shear force Connectors; the ultra-high toughness concrete has been cured by high-temperature steam, and the super-high toughness concrete bridge deck is not provided with joints or only transverse joints are provided between the prefabricated segments of the ultra-high toughness concrete bridge deck. 2.根据权利要求1所述的超高韧性混凝土板-钢梁轻型组合桥梁结构,其特征在于:所述镀铜高强钢纤维的长度与直径的比例控制为70~100;所述镀铜高强钢纤维的外形包括平直形、带端钩、扭曲形中的两种或多种。2. The ultra-high toughness concrete slab-steel girder light composite bridge structure according to claim 1, characterized in that: the ratio of the length to diameter of the copper-coated high-strength steel fibers is controlled to be 70-100; the copper-plated high-strength The shapes of the steel fibers include two or more of straight, hooked and twisted. 3.根据权利要求2所述的超高韧性混凝土板-钢梁轻型组合桥梁结构,其特征在于:所述镀铜高强钢纤维选用镀铜高强钢纤维A和镀铜高强钢纤维B,所述镀铜高强钢纤维A和所述镀铜高强钢纤维B为以下三种组合中的任意一组:3. The ultra-high toughness concrete slab-steel girder light composite bridge structure according to claim 2, characterized in that: the copper-plated high-strength steel fiber is selected from copper-plated high-strength steel fiber A and copper-plated high-strength steel fiber B, the The copper-plated high-strength steel fiber A and the copper-plated high-strength steel fiber B are any one of the following three combinations: 组合一:所述镀铜高强钢纤维A是指长度14mm、直径0.2mm的带端钩镀铜高强钢纤维,所述镀铜高强钢纤维B是指长度30mm、直径0.3mm的平直形镀铜高强钢纤维;Combination 1: The copper-plated high-strength steel fiber A refers to a copper-plated high-strength steel fiber with an end hook with a length of 14 mm and a diameter of 0.2 mm, and the copper-plated high-strength steel fiber B refers to a straight plated steel fiber with a length of 30 mm and a diameter of 0.3 mm. Copper high-strength steel fiber; 组合二:所述镀铜高强钢纤维A是指长度14mm、直径0.2mm的带端钩镀铜高强钢纤维,所述镀铜高强钢纤维B是指长度30mm、直径0.3mm的经冷轧扭加工的扭曲形镀铜高强钢纤维;Combination 2: The copper-plated high-strength steel fiber A refers to a copper-plated high-strength steel fiber with an end hook with a length of 14 mm and a diameter of 0.2 mm, and the copper-plated high-strength steel fiber B refers to a cold-rolled twisted steel fiber with a length of 30 mm and a diameter of 0.3 mm. Processed twisted copper-coated high-strength steel fibers; 组合三:所述镀铜高强钢纤维A是指长度14mm、直径0.2mm的平直形镀铜高强钢纤维,所述镀铜高强钢纤维B是指长度30mm、直径0.3mm的带端钩镀铜高强钢纤维;Combination 3: The copper-plated high-strength steel fiber A refers to a straight copper-plated high-strength steel fiber with a length of 14 mm and a diameter of 0.2 mm, and the copper-plated high-strength steel fiber B refers to a hook-plated steel fiber with a length of 30 mm and a diameter of 0.3 mm. Copper high-strength steel fiber; 所述镀铜高强钢纤维A和镀铜高强钢纤维B的掺入体积比控制在0.5∶1~1∶0.5,所述镀铜高强钢纤维的总体积掺量为2%~4%。The mixing volume ratio of the copper-coated high-strength steel fiber A and the copper-coated high-strength steel fiber B is controlled at 0.5:1-1:0.5, and the total volume dosage of the copper-coated high-strength steel fiber is 2%-4%. 4.根据权利要求1~3中任一项所述的超高韧性混凝土板-钢梁轻型组合桥梁结构,其特征在于:所述石棉尾矿酸性浸渣超细粉的平均粒径为2μm~5μm,石棉尾矿酸性浸渣超细粉的掺入量为超高韧性混凝土组分中胶凝材料的10%~25%。4. The ultra-high toughness concrete slab-steel girder light composite bridge structure according to any one of claims 1 to 3, characterized in that: the average particle size of the asbestos tailings acidic leaching slag ultrafine powder is 2 μm to 5 μm, the mixing amount of asbestos tailings acidic leaching slag superfine powder is 10% to 25% of the cementitious material in the ultra-high toughness concrete component. 5.根据权利要求4所述的超高韧性混凝土板-钢梁轻型组合桥梁结构,其特征在于:所述钢横梁为其上翼缘板与钢纵梁的上翼缘板等高的工字型实腹式横向联结系;所述钢横梁沿桥梁纵向密集布置,密集布置是指钢横梁间距为钢纵梁间距的1/3~1/2或3m~6m。5. The ultra-high toughness concrete slab-steel girder light composite bridge structure according to claim 4, characterized in that: the steel cross beam is an I-shape with the same height as the upper flange plate and the upper flange plate of the steel longitudinal beam Type solid-belt horizontal connection system; the steel beams are densely arranged along the longitudinal direction of the bridge, and the dense arrangement means that the distance between the steel beams is 1/3-1/2 or 3m-6m of the distance between the steel longitudinal beams. 6.根据权利要求4所述的超高韧性混凝土板-钢梁轻型组合桥梁结构,其特征在于:所述超高韧性混凝土桥面板的厚度为8cm~16cm;所述超高韧性混凝土桥面板内的纵横向钢筋网的单向配筋率为3%~6%。6. The ultra-high toughness concrete slab-steel girder light composite bridge structure according to claim 4, characterized in that: the thickness of the ultra-high toughness concrete bridge deck is 8cm to 16cm; The unidirectional reinforcement rate of the vertical and horizontal steel mesh is 3% to 6%. 7.根据权利要求4所述的超高韧性混凝土板-钢梁轻型组合桥梁结构,其特征在于:所述超高韧性混凝土桥面板的横向接缝间距为8m~30m。7. The ultra-high toughness concrete slab-steel girder light composite bridge structure according to claim 4, characterized in that: the transverse joint spacing of the ultra-high toughness concrete bridge deck is 8m-30m. 8.根据权利要求7所述的超高韧性混凝土板-钢梁轻型组合桥梁结构,其特征在于:所述超高韧性混凝土桥面板的横向接缝设置在钢横梁间的跨中位置或钢横梁的腹板顶部,并在横向接缝处下方增设局部增强钢板。8. The ultra-high toughness concrete slab-steel girder light composite bridge structure according to claim 7, characterized in that: the transverse joints of the ultra-high toughness concrete bridge deck are arranged at the mid-span position between the steel beams or the steel beams The top of the web, and add local reinforced steel plates below the transverse joints. 9.根据权利要求8所述的超高韧性混凝土板-钢梁轻型组合桥梁结构,其特征在于:当所述横向接缝设置在钢横梁的腹板顶部位置时,所述横向接缝处采用加宽顶板和焊接纵向加劲板处理;当横向接缝设置在钢横梁间的跨中位置时,该横向接缝处增设横向增强钢板。9. The ultra-high toughness concrete slab-steel girder light composite bridge structure according to claim 8, characterized in that: when the transverse joint is arranged at the top of the web of the steel crossbeam, the transverse joint adopts Widened roof and welded longitudinal stiffeners; when transverse joints are set at the mid-span position between steel beams, transverse reinforced steel plates are added at the transverse joints.
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