Jack symmetric precompaction construction method for hanging basket girders for bridge hanging basket suspension casting construction

Abstract

The invention relates to a jack symmetric precompaction construction method for hanging basket girders for bridge hanging basket suspension casting construction. The method comprises the following ten steps: 1, selecting a precompaction field; 2, assembling the hanging basket girders; 3, symmetrically putting the two hanging basket girders on four wood pads; 4, prefixing rear anchor points; 5, assembling a middle fulcrum point block; 6, mounting a hanging basket loading system; 7, measuring the relative position size of the two hanging basket girders before loading; 8, loading and measuring the relative position size of the two hanging basket girders; 9, unloading and measuring the relative position size of the two hanging basket girders; and 10, calculating and analyzing according to measurement data. The method has the advantages that the precompaction on bridge can be substituted, thus heavy workload for suspending sandbags can be avoided; the precompaction work efficiency is effectively quickened so as to save massive precompaction construction time; load can be applied by the jack, and precompaction data can be accurately controlled; and the precompaction process and observation process of the hanging basket are performed in the field with high safety and strong controllability.

Description

technical field [0001] The invention belongs to the technical field of bridge construction, and in particular relates to a hanging basket truss used for hanging construction of a bridge hanging basket. Background technique [0002] With the continuous development of bridge engineering construction, there are more and more types of bridge structures. As a widely used construction method, hanging basket cantilever construction has also been used more and more. In hanging basket hanging construction, the hanging basket is a necessary construction measure component. During construction, the rear end of the hanging basket is anchored on the poured concrete bridge section, the fulcrum is supported on the poured concrete beam end, and the front end is hung The bottom form, side form and inner form of the beam section to be poured form the concrete pouring conditions. With the concrete pouring of each beam section, the hanging basket is gradually pushed forward for construction. T...

AI Technical Summary

Problems solved by technology

At present, the commonly used preloading method is to hoist the processed hanging basket to the top of the 0# section of the box girder on the bridge deck after the trial assembly in the processing yard, and carry out preloading on the top of the beam. Generally, sand bags or piles are used. Water storage, adopting this kind of preloading method, has the following disadvantages, which will affect the construction: 1. The workload on the bridge is heavy

Since the preload is equal load or overload preload, generally the preload load of each set of hanging baskets is more than 200t, and 200t of sandbags need to be hoisted, loaded and unloaded, and the labor intensity is high, and strict control is required, which consumes a lot of machinery and manpower.

And a hanging basket is composed of two triangular hanging basket trusses. When preloading, it is necessary to control the unbalanced weight on both sides to not exceed 5t, which is difficult to control

2. Prolong the construction period

Affect the duration of 15 days, or even longer

3. Inaccurate control of preloading data

No matter whether sand bag or water storage preload is used, the weight of the loaded load cannot be accurately controlled. Although it can eliminate the inelastic deformation, the elastic deformation value cannot be accurately measured.

4. It is difficult to observe the deformation and nodes everywhere

After the hanging basket is installed on the bridge, during the preloading process, both the deformation observation of the hanging basket and the deformation observation of the nodes need to be inspected by climbing, which is difficult and unsafe to observe

5. Traditional preloading is for high-altitude operations, and there are greater risks in safety

In case the design, processing or material quality of hanging basket trusses are unqualified, or the stacking exceeds the design value, it may cause the hanging basket system to overturn and lead to major safety and quality accidents

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