Semi-integrated seamless bridge structure adaptive to soft foundation

Abstract

The invention discloses a semi-integrated seamless bridge structure adaptive to a soft foundation. The semi-integrated seamless bridge structure comprises a main beam, piers, approach slabs and abutments, wherein the main beam and the approach slabs are connected into a whole, and the upper surface of the whole is sequentially paved with a bituminous concrete pavement layer, a waterproof layer and a leveling layer of a reinforced concrete pavement layer from top to bottom. Pavement steel bars are arranged in the reinforced concrete pavement layer. The main beam comprises a plurality of spans, a pull-press combined component is arranged between every two adjacent spans, and pull-press combined components are also arranged between the main beam and the approach slabs. Each pull-press combined component comprises a reinforcing steel bar, a PBL anti-shearing device perforated panel, a hole-penetrating steel bar, a pull-resisting top plate, a shallow embedded plate, deep embedded plates and a beam end trapezoidal lug pressing rod. The continuous main beam structure is simplified into the continuous pull-press combined components on a bridge deck, additional internal force brought by differential settlement to the structure is remarkably reduced, and material consumption is lowered; and meanwhile, side effects caused by adding of materials are avoided. The construction process and the structure form are simplified, the structure stress performance is improved, and the construction quality is easy to guarantee.

Description

Technical field [0001] The invention relates to the technical field of bridge construction, in particular to a semi-integral seamless bridge structure adapted to soft ground. Background technique [0002] (Semi-)Integral seamless bridge. Because the expansion device at the abutment is eliminated, the expansion joints at both ends of the bridge are moved to the end of the slab, and the temperature deformation of the main girder is transferred to the junction of the slab and the road through the slab, thus changing the bridge The expansion joint is a road joint, which simplifies the joint structure, improves the performance of the bridge, and reduces the maintenance cost. [0003] Traditional semi-monolithic seamless bridges generally integrate the main girder and the slab structure into one to form a multi-span structural continuous system to overcome the problem of easy cracking and damage of the continuous part of the traditional simply supported beam bridge and poor seismic perfo...

AI Technical Summary

Problems solved by technology

[0003] In traditional semi-integral seamless bridges, the main girder and the slab structure are generally poured together to form a multi-span structural continuous system, so as to overcome the problems that the continuous part of the traditional simply supported bridge deck is easy to crack and damage, and the seismic performance is poor

[0004] However, when the continuous girder bridge is located in the soft soil foundation area, the differential settlement will generate a large additional internal force on the structure, especially for bridges with small and medium spans. The amount needs to be increased by about 40%, which will lead to an increase in the arching deformation of the prefabricated beam section

Since the (semi) integral seamless bridge is different from the traditional girder bridge with pure bending members, it is a compression-bending member. Excessive arching deformation will increase the eccentricity of the axial force to the center of gravity axis of the section, which will easily cause the main girder mid-span upper edge cracking

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