Transverse anchorage system outside hollow slab bridge body and construction process thereof

Abstract

The invention relates to a transverse anchorage system outside a hollow slab bridge body and a construction process thereof. A left side slab of a hollow slab bridge is provided with a left corbel; a right side slab is provided with a right corbel; both the left corbel and the right corbel are provided with sylphon bellows; a prestressed cable penetratively arranged in each sylphon bellows; the left corbel and the right corbel are connected through the prestressed cable; the left end and the right end of the prestressed cable are respectively fixed by a left anchor device and a right anchor device; and the prestressed cable is connected with a middle slab through a flying ring. The transverse anchorage system is characterized in that the side slabs on both sides of the hollow slab bridge are respectively provided with a reinforced concrete corbel; the reinforced concrete corbels are cast together with the side slabs; the reinforced concrete corbels on both sides are connected with each other through the prestressed cable; and both ends of the prestressed cable are fixed to the reinforced concrete corbels by the anchor devices, and thus the structural rigidity and the integrity of the whole anchorage system are improved, the anchorage ends are guaranteed to be free from loosening, and the looseness of the prestressed cable is avoided. The invention solves the problems of easy looseness of a profile steel anchor lining plate, easy generation of fatigue damage, corrosion of a steel plate, and the like in the traditional anchorage system.

Description

Technical field: [0001] The invention belongs to the technical field of bridge reinforcement and maintenance construction, and in particular relates to an external lateral anchoring system of a hollow slab bridge and a construction process thereof. Background technique: [0002] Prestressed concrete prefabricated hollow slab bridge is a main type of highway bridge in China, and it is widely used in medium and small span highway bridges. With the rapid growth of traffic volume and the impact of many unfavorable factors such as vehicle overrun, many hollow slab bridges have various diseases, which need to be repaired and strengthened in time. Among various reinforcement methods, external prestress reinforcement method is an effective method. This method is to improve the bearing capacity of the bridge by stretching the externally prestressed cables in the tension area of ​​the bridge. The anti-bending moment offsets the internal force generated by part of the external load, ...

AI Technical Summary

Problems solved by technology

Although the installation and construction of the anchorage system using steel anchorage liners are relatively simple, since the rigidity of the steel sections is much smaller than that of the concrete hollow slab, loosening, fatigue damage and corrosion of the steel anchorage liners are prone to occur during bridge operation after reinforcement This will cause the relaxation of the applied transverse prestressed cables and reduce the transverse prestressing degree of the bottom of the slab, thus adversely affecting the reinforcement of the assembled hollow slab bridge, and even causing reinforcement failure in severe cases

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