Assembly type bamboo bridge with variable expansion coefficients

Abstract

The invention provides an assembly type bamboo bridge. The assembly type bamboo bridge comprises bamboo longitudinal beams (1), bamboo transverse beams (2), bamboo panels (3), transverse pre-stressing tendons (4) and longitudinal pre-stressing tendons (16), the outer surface of a bamboo is sequentially and uniformly coated with a layer of waterborne polyurethane resin, a layer of polyurethane resin, a layer of waterborne polyurethane resin and a layer of resorcinol formaldehyde resin, and the expansion coefficients of the four coating layers are sequentially lessened from the outer surface of the bamboo to outside. The assembly type bamboo bridge provided by the invention has the advantages that the structural strength is large, the ductility is good, a selected material is environment-friendly, standardization degree and assembling degree of structural members are high, the structural integrity is good, the advantages of the material can be fully expressed, and the requirements on normal use and durability of a bridge structure can be met.

Description

[0001] technical field [0002] The invention belongs to the technical field of bridge structures, in particular to an assembled bamboo bridge. Background technique [0003] Under the current background of developing low-carbon economy, green, ecological, environmental protection and low-carbon new building structural materials are the inevitable direction of civil engineering technology development. The biggest advantage of bamboo is environmental protection and renewable raw materials. The period of bamboo is generally 2 to 4 years (wood takes 20 years). According to incomplete statistics, the national bamboo forest area is about 3.54 million hectares (not including Taiwan Province), accounting for about 3% of the total forest area, with a stock volume of about 80 million tons and an annual output of more than 8 million tons of bamboo. my country's bamboo species and bamboo forest area account for about 1 / 4 of the world's total, and bamboo production accounts for about 1 / ...

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Problems solved by technology

[0006] (1) For the reinforced concrete structure, its self-heaviness and long construction and maintenance period

[0007] (2) For steel structures or steel-concrete composite structures, the main load-bearing part is steel beams, the cost of steel is high, and the corrosion resistance is poor. Corrosion will affect the normal use of the bridge, resulting in high maintenance costs

[0008] (3) The materials used are not environmentally friendly. The building materials used in traditional bridges are steel, cement, and the production of concrete materials or steel has high energy consumption and high pollution. Even wood and reinforced concrete cannot be recycled, nor can they be digested by nature. The growth cycle of wood is long, and deforestation to build bridges is undoubtedly contrary to environmental protection

[0010] Compared with other building materials, bamboo has significant advantages in terms of earthquake resistance, environmental protection, comfort, and industrialization, and the current structure made of bamboo has begun to appear in the field of bridge construction, such as Chinese patent "200610031948.9", which discloses a bamboo bridge. Composed of bamboo components, the structure is simple, the construction is convenient, and the construction materials are environmentally friendly. However, for this type of all-bamboo structure bridge, the amount of bamboo is large, the section stiffness is low, and the integrity of the whole bridge is insufficient.

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