A steel-bamboo composite box girder

Abstract

The invention discloses a steel and bamboo combined box girder. The steel and bamboo combined box girder comprises a top plate and at least one bottom plate, wherein the bottom plate is arranged under the top plate; each bottom plate is connected with the top plate through two symmetrically arranged corrugated steel webs; the top plate is obtained by pressing a plurality of single bamboo veneers through pre-stressed steel bars, wherein the single bamboo veneers have equal heights and are arranged in parallel with lengths in a bridge traffic direction; and meanwhile, the corrugated steel webs are connected with the top plate and the bottom plates through shear steel sheets. The steel and bamboo combined box girder disclosed by the invention is advantaged in that anti-buckling and anti-crack capacities of the corrugated steel webs and the tensile capacities of the bamboo veneers are maximized; the structural integrity is good, the box girder is not prone to crack; the field construction is easy; the period is short; the material is environment-friendly and durable; and requirements of various different-span bridges can be satisfied.

Description

technical field [0001] The invention belongs to the field of bridge structures, in particular to a steel-bamboo composite box girder. Background technique [0002] Corrugated steel web composite box bridges are 20 century 80 A new type of bridge that appeared in the 1990s is a new type of steel that uses corrugated steel plates to replace the concrete webs of prestressed concrete box girders. - concrete composite structure. Compared with the conventional structure, its advantage lies in its light weight, which can reduce the engineering quantity of the substructure, thereby reducing the total cost of the project; it avoids the problem of web cracking, and the structure has good durability. However, there are many joints of corrugated steel webs, and its connection structure is relatively complicated, which makes it difficult to install formwork and brackets during the pouring process of the bottom slab and roof, and the construction is difficult; and the concrete...

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Problems solved by technology

[0003] The existing corrugated steel web composite box girder is mainly made of reinforced concrete for the top and bottom slabs. Chang’an University has studied using wood to partially replace concrete and proposed a steel-wood composite box girder. However, the connection between the steel web and the wood board is still Cast-in-place concrete cannot solve the problem of difficult formwork construction; and my country's timber resources are scarce, and the per capita forest area is only 0.13 square hectares, less than the world average 1 / 4 , ranking first in the world 134 Statistics show that the main problems in my country's forests are: insufficient total resources; low forest quality and uneven distribution; slow growth of forest resources, and now domestic wooden structures are rarely used

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