UHPC-NC combined bridge deck slab structure with stiffening ribs and construction method of UHPC-NC combined bridge deck slab structure

Abstract

The invention relates to a UHPC-NC combined bridge deck structure provided with stiffening ribs and a construction method thereof.The combined bridge deck structure comprises a plurality of UHPC components provided with the UHPC stiffening ribs, a UHPC connecting layer, bridge deck steel bars and an NC post-pouring layer, the UHPC components are hoisted on a main beam, the UHPC connecting layer is poured between every two adjacent UHPC components, and the NC post-pouring layer is connected with the UHPC components. The bridge deck slab reinforcing steel bars are laid on the tops of the stiffening ribs, and the NC post-pouring layer is poured on the UHPC components and the bridge deck slab reinforcing steel bars. By using the construction method provided by the invention, the UHPC-NC combined bridge deck slab structure of the stiffening ribs can be obtained. Compared with the prior art, the method has the advantages that the bridge deck structure is optimized, the engineering cost is reduced, the operation and maintenance cost of the whole life cycle is reduced, construction is convenient, the speed is high, quality is good, and safety is high.

Description

technical field [0001] The invention relates to the technical field of bridge engineering, in particular to a UHPC-NC composite bridge deck structure provided with stiffeners and a construction method thereof. Background technique [0002] In bridge engineering, the bridge deck is generally used to directly bear the wheel load of the vehicle. In the composite structure bridge, the bridge deck is set on the top plate of the longitudinal beam or beam, and is integrally connected with the longitudinal beam or beam through connectors, concrete, etc., so that the vehicle can be The load is transmitted to the main girder, and can become an integral part of the beam body section, and ensure the overall function of the main girder or between the main girders. Therefore, the role of the bridge deck in the bridge structure is very important. At present, the bridge deck in bridge engineering generally adopts ordinary reinforced concrete or prestressed concrete structure. However, in a...

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Problems solved by technology

However, in actual use, the bridge deck is prone to cracks, which will affect the durability of the structure and even reduce the bearing capacity of the structure. , temperature effect and other load effects that cause the temperature rise of the top surface of the bridge deck, etc., make the lower edge of the bridge deck under tension, and has been in a complex stress state. The second is because the ordinary concrete (Normal Concrete , NC), is a brittle material with high compressive strength, but low tensile and flexural strength. When the concrete is stretched or bent, it will crack in a small tensile stress / tensile strain state

The usual method to reduce the cracking of the bridge deck is to appropriately increase the thickness of the bridge deck to reduce the roof stress caused by vehicles and temperature differences, but it will increase the structural dead load; it is also possible to apply transverse prestress, but because the deck is generally thin, it is difficult to pre-stress during construction. The position deviation of the stress layout has a great influence on the force of the slab, the construction process is more complicated, and the construction period is longer; in addition, it is necessary to strengthen the pouring and curing measures for the cast-in-place concrete of the bridge deck

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