Jacking frame overpass construction method based on self-anchored prestressed overhead system

Abstract

The invention discloses a jacking frame overpass construction method based on a self-anchored prestressed overhead system. The method comprises the following steps: constructing and arranging gate-shaped anchoring piles on roadbed slopes at two sides of a highway or a railway; arranging a cross beam on the tops of the anchoring piles, and solidifying the cross beam and the anchoring piles to forma gate-shaped frame; driving guide steel pipes into reserved positioning holes of the gate-shaped frame to the opposite sides of roadbeds; penetrating prestressed steel bundles into the guide steel pipes to form the self-anchored prestressed gate-shaped frame overhead system; prefabricating overpass frame structure segments, and jacking the segments in place within the protection range of the self-anchored prestressed overhead system; and grouting on the periphery of the overpass frame structure, and making the overpass frame structure form a permanent stressed structure to bear railway or highway loads. The construction method provided by the invention can realize that the operation is not interrupted and a road is not changed when an existing highway or railway jacking frame overpass isconstructed.

Description

technical field [0001] The invention belongs to the technical field of jacking frame overpass construction, in particular to a jacking frame overpass construction method based on a self-anchored prestressed overhead system. Background technique [0002] Interchange jacking construction is a common construction method for road underpassing, and it is a common crossing form for new roads to pass under existing highways and railways. [0003] At present, the existing jacking interchange construction methods mainly include: [0004] (1) For the expressway, the way of changing the road is generally adopted. First, half of the overpass is closed, and then the main part of the half-overpass is constructed, and then moved to the other half for construction. For deep-buried overpasses, the tunnel shield construction method is adopted. [0005] (2) The construction method of overhead jacking is generally adopted for the railway, the tunnel shield form is adopted for the deep burial o...

AI Technical Summary

Problems solved by technology

[0007] The existing problems in the construction of the overpass of the operating expressway: ①The expressway is restricted by conditions such as intercommunication or land acquisition, and it is impossible to implement temporary road relocation; and the operation department requires the entire road to be guaranteed, so it is impossible to implement half-width closure

②The burial depth of interchanges and expressways is not enough to implement tunnel shield construction

[0008] Problems existing in the construction of railway interchanges in operation: ①Limited by road slope and other conditions, it forms a shallow soil covering state with the railway to be handed over. It is more complicated to adopt measures to increase the net height of the structure, which has a greater impact on the safety of railway operations.

②Affected by the implementation conditions, shield construction cannot be used, and the excavation depth of sloping by overhead jacking is relatively deep, and the overhead range of the line is large, which has a great impact on the safety of railway operation. It is necessary to reduce the jacking excavation section

③The multi-line turnout area is affected by the turnout, and it is difficult to implement overhead, closure, and relocation

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