Ultra-high performance concrete (UHPC) combined deck slab with formwork

Abstract

The invention discloses an ultra-high performance concrete (UHPC) combined deck slab with a formwork. The UHPC combined deck slab is mainly formed by splicing of a plurality of unit plates. Each unitplate comprises a steel bottom plate and a UHPC slab body arranged on the steel bottom plate. Shear connecting pieces used for connecting the UHPC slab bodies are welded to the steel bottom plates. Each steel bottom plate is a flat thin-wall steel member in a quadrangular prism frustum shape. The adjacent steel bottom plates are connected with internal members of a main beam on the lower portionsof the deck slab, so that the steel bottom plates are connected into a whole. Steel bars connected into a whole are arranged on the upper portions of the shear connecting pieces in the forward direction of a bridge and the transverse direction of the bridge to form an upper edge force bearing steel net of the deck slab, the steel bottom plates and the shear connecting pieces become lower edge force bearing steel bars and shear steel bars of the deck slab correspondingly and serve as the bottom formwork jointly. The deck slab adopts UHPC so that the problems that in the prior art, cracking anddeck pavement damage are likely to occur can be effectively solved; and additionally the formwork engineering quantity can be reduced by a large margin, formwork mounting and demounting work is omitted, and thus the construction efficiency is improved.

Description

technical field [0001] The invention relates to an ultra-high performance concrete (UHPC) composite bridge deck with its own formwork. Background technique [0002] The orthotropic steel bridge deck is composed of a steel roof, longitudinal stiffeners and diaphragms connected by welds. It has a series of advantages such as light weight, large ultimate bearing capacity, and short construction period, and is widely used in large-span bridges. In bridges, due to factors such as low stiffness of steel bridge decks, poor bonding performance with asphalt concrete, and poor mutual coordination and deformation performance, many orthotropic steel bridge decks in service have fatigue cracking and pavement damage ( ruts, potholes) and many other diseases; and the use of heavier ordinary concrete decks to replace the orthotropic steel decks on the steel girders, although the fatigue of the orthotropic steel decks has been solved, but due to its own lower tensile strength Low, not only ...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a self-contained formwork ultra-high performance concrete (UHPC) composite bridge deck with high tensile and compressive strength, reliable connection, convenient construction, good durability and low cost, which can effectively solve the existing problems. Fatigue cracking caused by orthotropic steel bridge deck, bridge deck pavement damage and ordinary concrete bridge deck are easy to crack and other technical problems that have plagued the engineering field for a long time. It is suitable for PK steel box composite girders, closed steel box composite beams, and side steel boxes. Composite beams, I-beam composite beams and steel truss composite beams, etc.

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