Herring-bone wall body construction method of large-span concrete herring-bone continuous girder bridge and structure thereof

Abstract

The invention discloses a herring-bone wall body construction method of a large-span concrete herring-bone continuous girder bridge and a structure thereof. The middle symmetric sectional pouring construction method for a herring-bone wall body and a main beam comprises following steps that step 1, a middle section main beam is poured on a bridge pier; step 2, the construction of a middle section herring-bone continuous girder bridge and the cradle avoidance section are completed on the middle section main beam through a completely-high pouring way, and a steel bundle in the middle section herring-bone wall body is strained; step 3, the middle section main beam extends towards the direction of two ends; step 4, the middle section herring-bone wall body and the cradle avoidance section are constructed on a suspension pouring section in an extending mode, and then the corresponding steel bundle is strained; and step 5, the step 3 and the step 4 are sequentially circulated until the herring-bone wall body reaches the designed length, and the entire construction flow is completed. The construction method and the construction structure of the herring-bone wall body of the large-span concrete herring-bone continuous girdler bridge are convenient to construct and specific in stress.

Description

technical field [0001] The invention relates to the technical field of bridge construction, in particular to a fish ridge wall construction method and structure of a large-span concrete fish ridge continuous girder bridge. Background technique [0002] In the prestressed concrete fish ridge continuous girder bridge, the fish ridge wall on the main girder is the main force-bearing structure, and its construction method is one of the key technologies of the girder bridge. [0003] At present, in the technical field of building prestressed concrete fish ridge continuous girder bridges, the construction methods of fish ridge walls mainly include: the fish ridge of small-span bridges adopts the integral pouring method (not suitable for large-span beam bridges), The fish ridge of the long-span bridge adopts the layered construction method (the fish ridge is poured layer by layer with the elongation of the cantilever section of the beam). If the layered method is used for construct...

AI Technical Summary

Problems solved by technology

[0004] (1) The cross-section of the fish ridge wall is a multi-layer superimposed structure, and the force is more complicated

Since the time-dependent properties (shrinkage, creep) of concrete materials have a certain degree of discreteness, the error between calculation and actual force is difficult to control, and the workload is large

[0005] (2) The prestress in the early stage cannot provide compressive stress on the later layer. In order to ensure that the later layer has sufficient compressive stress to meet the stress requirements, more prestressed material is required.

[0006] (3) The construction process is relatively complicated, and the layers are combined with new and old concrete, which is prone to shrinkage cracks

Images