Structure of slant legged rigid frame bridge and cantalever pouring construction method

Abstract

The invention discloses a pouring construction method of the structure of a continuous rigid frame bridge with inclined legs and a cantilever, which includes the following steps: firstly, bottom chords (the inclined legs) are arranged; secondly, the proper depth of a root girder is selected and is equal to 1 / 8 to 1 / 10 of the main span; thirdly, the proper height of a solid-web girder section is selected, the height of ends thereof is equal to 1 / 15 to 1 / 17 of the length of the solid-web girder section, and the mid-span height is equal to 1 / 50 to 1 / 70 of the length of the main span; fourthly, the cantilever pouring construction is carried out on sections of top chords and the bottom chords until a stable triangle truss is formed; and fifthly, the cantilever pouring construction is carried out to each section of the solid-web girder section for joining the sections so as to complete the whole bridge construction. A cantilever pouring and construction device comprises a cradle, a top chord template, a bottom chord template, a front hanger rod and a rear hanger rod. The method is simple and has safe and convenient construction, simple structure and stability and reliability, thereby improving the spanning capacity and the engineering economical efficiency of the bridge.

Description

technical field [0001] The invention relates to the technical field of civil engineering bridges, more specifically to a structure and cantilever pouring construction method of a slanted-leg (empty belly) continuous rigid-frame bridge. Under the premise of basically the same sexual characteristics, a new bridge type with greater spanning capacity and better economy has been realized. Background technique [0002] A bridge is a structure for crossing various obstacles (such as rivers or other structures) in highways, railways, urban roads, rural roads, and water conservancy construction. According to the mechanical characteristics of the structure, the bridge can be divided into beam, arch, rigid frame, suspension and composite system. The concrete structure mainly adopts beam, arch and rigid frame system. Prestressed concrete continuous rigid frame bridge is a basic type of long-span bridge, which has the following three characteristics: (1) The main pier is consolidated w...

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Problems solved by technology

[0004] Generally speaking, the main disadvantages of traditional prestressed concrete continuous rigid frame bridges are: (1) the spanning capacity is small, the material utilization rate is low, and when the span is greater than 200m, the engineering economy deteriorates sharply; (2) the structural bearing efficiency Low, when applied to bridges with a span greater than 200m, it is prone to cracking and deflection problems, the technical risk increases, and the safety and durability of the structure deteriorate; poor ability for earthquakes

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