Secondary locking and temporary fixation structure for main pier of cross-river bridge and construction method

Abstract

The invention relates to a secondary locking and temporary fixation structure for a main pier of a cross-river bridge. The secondary locking and temporary fixation structure mainly comprises steel pipe columns, steel pipe column connecting ends, anchor cables, deformed steel bars, brackets, temporary supports and an adjustable template supporting system. The steel pipe columns are arranged on a bearing platform and anchored to the steel pipe column connecting ends embedded in the bearing platform. The anchor cables and the deformed steel bars are arranged in the steel pipe columns, the lower ends of the anchor cables and the lower ends of the deformed steel bars are anchored to connecting end plates in the steel pipe column connecting ends, and the upper ends of the anchor cables and the upper ends of the deformed steel bars are anchored to a cast-in-place box beam bottom plate. The temporary supports are installed on the top of the pier, and the embedded deformed steel bars are arranged in the temporary supports. The brackets are arranged on corbels of the steel pipe columns and provided with a supporting seat, a bottom die is installed on the top face of the supporting seat, the installation angle of an integrated flank template is adjusted through adjustable stay bars, and the integrated flank template is fixedly connected with the bottom die. A core die is supported through an adjustable cross-shaped inner support. A secondary anchoring system is adopted in the structure, and the problem of uneven stress in the 0# block construction process is successfully solved. The invention further provides a construction method of the secondary locking and temporary fixation structure for the main pier of the cross-river bridge.

Description

technical field [0001] The invention relates to a secondary locking temporary consolidation structure of the main pier of a bridge across a river and a construction method. It belongs to the field of bridge engineering and is suitable for the main pier of the bridge. # The temporary consolidation construction of blocks is especially suitable for the main pier 0 under the pier-beam skew condition # block construction. Background technique [0002] With the development of society, the span of continuous girder bridges is getting larger and larger, and the construction method of hanging blue is used more and more, but there is a problem of system conversion in the continuous girder bridge built by the hanging blue construction method, and the zero block is under construction In this stage, there is a system transition from temporary consolidation to bridge support, and different anchorage forms have different effects on the internal force of the zero block, so the anchorage f...

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Problems solved by technology

[0003] In the temporary anchorage design of the zero block of continuous girder bridges, the traditional temporary anchoring method directly sets temporary supports on the main pier, and temporarily consolidates the zero block and the main pier through fine-rolled rebar, or establishes a temporary support on the main pier The temporary consolidation of block No. 0 is carried out with a frame. This type of temporary consolidation method is simple in construction, but it is difficult to ensure the force balance of block No. 0 under the condition of oblique pier beams. For the case of oblique pier beams, there are currently An improved form of temporary consolidation, such as setting a temporary support on the top of the pier and setting a temporary buttress on the main platform, using cast-in-situ concrete to set prestressed beams in both the temporary support and the temporary buttress, and through the prestressed beams Consolidate the caps, buttresses and the beam bottom of No. 0 block, but the construction of this temporary consolidation method is relatively complicated, especially the pouring of concrete in the temporary buttresses and the embedding of prestressed bundles, and it also involves the stability of the temporary buttresses. There is a large room for optimization

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