Masonry arch bridge using lightweight concrete as arch filler

Abstract

The invention discloses a masonry arch bridge using lightweight concrete as arch filler. The masonry arch bridge comprises a main arch ring (1), a spandrel arch (3) and an arch filler layer (2) and is characterized in that the arch filler layer (2) is a lightweight concrete filler layer, and the apparent density of the lightweight concrete filler layer is 800kg / m<3>-1950kg / m<3>; a leveling layer (4) is arranged on the top surface of the arch filler layer (2); a waterproof layer (7) is arranged between the main arch ring (1) and the arch filler layer (2); and saw joints (5) are arranged along the transverse direction of the bridge; and water permeating pipes (6) are arranged in the lowest position of each filler formed by the pairwise saw joints (5) and at two sides of a side wall. The waterproof layer (7) is formed by laying a permanent condensate or asphalt. The masonry arch bridge has the advantages that the stress of the arch can be effectively improved, the internal force of a dead load is reduced, and the carrying capacity of a bearing live load of the masonry arch bridge is increased.

Description

technical field [0001] The invention belongs to the field of structural design and material selection of masonry arch bridges, and in particular relates to a masonry arch bridge using lightweight concrete as the filler on the arch. Refilling of fillers on central plain arches for reinforcement of industrial arch bridges. Background technique [0002] Since the main arch ring of a masonry arch bridge is curved, generally vehicles cannot drive directly on the arc surface, so load-transmitting components and fillers are required between the carriageway system and the main arch ring, and these fillers are collectively called arches. Put on the stuffing. In the past, in order to reduce the cost, the filling materials on the arch were obtained locally, and gravel, crushed stone, coarse sand or pebbles were usually used with clay and tamped; Masonry or poured plain concrete is used as filler on the arch. [0003] The apparent density of fillers on traditional arches is generally...

AI Technical Summary

Problems solved by technology

[0003] The apparent density of fillers on traditional arches is generally 1800kg / m 3 ~2450kg / m 3 , which is much heavier than light concrete, so that the internal force of the arch is also large, which is not conducive to the force of the structure

Moreover, the water permeability of these materials is not good. After rainwater infiltrates, the expansion pressure on the side walls will increase, causing the side walls to crack; after water seeps in, the weight of the filler on the arch will increase, reducing the ability of the arch bridge to carry vehicle loads; seepage will flow to the main arch ring , lead to corrosion of steel bars at the cracks, weaken the cross-sectional area of ​​steel bars, and the expansion of steel bars after corrosion will cause concrete spalling, seriously affecting the bearing capacity and durability of arch bridges

At present, there is no relevant report on the effective construction method of using lightweight concrete as the filler on the arch of masonry arch bridges.

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