Construction method and structure for rigid frame bridge cast-in-situ section non-welded support

Abstract

The invention discloses a construction method for a rigid frame bridge cast-in-situ section non-welded support. The construction method includes the following steps that 1, a transition pier is poured, and tie bar holes are reserved in the two sides of a bent cap of the transition pier; 2, fulcrums are arranged on the left side and the right side of the front end of the top of the bent cap respectively; 3, a set of cantilever beams are erected at each side of the transition pier, the cantilever beams are supported on the fulcrums, after rear anchor rods penetrate through the tie bar holes, and the two ends of the rear anchor rods are anchored to upper anchor beams on the cantilever beams and the bottom of the bent cap respectively; 4, upper ends of booms are anchored to the upper anchor beams at the front ends of the cantilever beams and penetrate through the cantilever beams, and lower anchor beams are transversely arranged at the other ends; 5, longitudinal beams are placed on the lower anchor beams; 5, transverse overload beams are arranged on the longitudinal beams at the two sides; 6, a soffit formwork and other support systems are laid on the transverse overload beams; 7, the elevation of the soffit formwork is adjusted, and reinforced concrete is poured. The cast-in-situ section is constructed through the method and the structure, safety risks are reduced, bridge quality is ensured better, the support structure is relatively simple, and the construction period is shortened.

Description

technical field [0001] The invention relates to a construction method and structure of a bridge support, in particular to a construction method and structure of a non-welded support for a cast-in-place section of a rigid frame bridge. Background technique [0002] Rigid frame bridges generally consist of No. 0 section, standard section, cast-in-place section and closing section. In the early stage, the No. 0 section is generally constructed separately, then the standard section and the cast-in-place section are constructed, and finally the closing section is constructed. as attached image 3 As shown, the following methods are generally used for the construction of the cast-in-place section: first, it is necessary to install embedded parts on the pier body while pouring the transition pier, and then weld the steel corbel on the pre-embedded parts, and then set the longitudinal section on the top of the steel corbel. , horizontal distribution beams, etc. constitute the entir...

AI Technical Summary

Problems solved by technology

There are some problems in this construction method: firstly, the corbels need to be welded on the embedded parts, and the corbels need to be cut off when the brackets are removed, all of which need to be operated at high altitudes, and the time spent in the air is long, which makes the construction process safer The performance is reduced, and the cutting action will reduce the quality of the bridge. The whole construction period is longer and the cost is relatively high.

The force of the traditional support structure is not clear enough, which leads to excessive force on some support points and small force on some support points, which brings safety hazards. Moreover, the traditional support structure is relatively complicated, and some materials cannot be reused and can only be treated as waste. ; There are more materials used in the erection of the bracket, and the erection of the bracket takes a long time

[0003] Through literature search, we also found a construction method of cast-in-place section supports, which uses transition piers and cast beam sections as fulcrums to erect supports. The problem with this method is that the erection of supports must rely on poured beams If the standard section of the beam body is not poured to the last section and the hanging basket is removed, the bracket cannot be erected, so that the cast-in-place section cannot be made in advance, which will eventually affect the construction period of the whole bridge

Moreover, the closing section is the last beam section to be constructed during the bridge construction process. This method uses a support system to support the cast-in-place section and the closing section at the same time, which has a greater impact on the cantilever end box girder, which is inconsistent with the traditional design conditions. side redesign verification

This method is relatively time-consuming and labor-intensive, and some bridges are not feasible

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