Synchronous pre-pressing reference section bracket construction device and pre-pressing construction method thereof

Abstract

The invention discloses a synchronous pre-pressing reference section bracket construction device which comprises a pier column, triangular brackets are symmetrically installed on the two sides of the pier column in the bridge direction, a pressed beam system is arranged on the triangular brackets, counter-force frame inclined supporting rod embedded parts are symmetrically arranged on the two sides of the pier column in the bridge direction, the counter-force frame inclined supporting rod embedded parts are located above the triangular brackets, the outer sides of the counter-force frame inclined supporting rod embedded parts are connected with a counter-force frame inclined supporting rod, and the top end of the counter-force frame inclined supporting rod is fixedly connected with a counter-force frame horizontal rod system. The counter-force frame horizontal rod system is fixedly connected with the pier column in the position over the pier column through finish rolling deformed steel bars anchored in the pier column, a hydraulic jack is further arranged between the pressed beam system and the counter-force frame horizontal rod system, and the counter-force frame horizontal rod system is composed of a plurality of parallel counter-force frame horizontal rods. A pier top embedded steel bar vertical passing seam is reserved between every two adjacent counter-force frame horizontal rods in each group of counter-force frame horizontal rod system.

Description

technical field [0001] The invention relates to the technical field of bridge construction, in particular to a synchronous preloading reference section bracket construction device and a preloading construction method thereof. Background technique [0002] At present, the design of cantilever beams is mostly used in continuous beams (rigid structures), tied arches and cable-stayed bridges. The No. 0 block is the reference section for subsequent cantilever segment construction, and sometimes the length of No. 0 block does not meet the space for hanging basket assembly The minimum requirement, at this time, the No. 1 block is also used as a part of the reference section, and all of them are cast-in-situ using brackets or brackets. The construction of the base section controls the progress and safety quality of the whole bridge. It itself is made of mass concrete cast-in-place. Generally, the piers are relatively high, and the brackets beside the piers are used as the support sy...

AI Technical Summary

Problems solved by technology

[0003] The traditional bracket preloading method is to use sandbags, water bags or steel bars to carry out preloading preloading on the bridge, or to pre-embed prestressed steel bars on the cap platform for reverse tension preloading. These materials must be transported from the yard to the bridge. , and then hoisted to the bridge, it is time-consuming and labor-intensive, and the hoisting equipment such as tower cranes takes a long time. If the passage under the bridge is narrow, it will cause long-term traffic jams under the bridge; the waste of sand or water is serious, which is not conducive to the environment and water and soil conservation, steel bars, etc. The material is easy to rust if placed in the open air for a long time; the No. 0 block is a large-tonnage segment, the height of the box girder is the highest in the whole bridge, and the width of the bottom of the box girder is the same as the whole bridge, so the pressure area is limited, and it is difficult to pile up sandbags, water bags or steel bars. poor performance; under the wading condition of the cap, it is difficult to implement the way of prestressed steel pre-embedded cap cap reverse pull

[0004] Generally, block No. 0 is limited by conditions such as pier height, passage under the bridge, bottom width of box girder, wading cap, proximity to existing lines, and economy. Therefore, there is an urgent need for a structure and its construction method that can perform reliable preloading.

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