Bridge cantilevered casting hanging basket controllable equivalent pre-load testing method

Abstract

The invention discloses a bridge cantilevered casting hanging basket controllable equivalent pre-load testing method. The bridge cantilevered casting hanging basket controllable equivalent pre-load testing method comprises the following steps that 1, at least one anchor device is arranged at the two horizontal ends of the top face of a bridge bearing platform symmetrically in the bridge direction and in the longitudinal direction, center hole jacks are symmetrically installed on hanging baskets at the two sides of a main girder, a telescopic end of each center hole jack is connected with the corresponding anchor device through a steel strand, and each steel strand is tensed through the corresponding center hole jack; 2, the center hole jacks on hanging baskets at the two sides increase synchronously step by step, and a load deformation value is measured; 3, after no continuous deformation development of the hanging baskets is observed, unloading is conducted step by step, and the unloading deformation value is measured. The bridge cantilevered casting hanging basket controllable equivalent pre-load testing method adopts the center hole jack to tense the steel strand to exert pressure, the load is equivalent and controllable, the data are more real and reliable, meanwhile, the pre-pressing precision is improved, the testing cost is reduced, and the testing time is shortened.

Description

technical field [0001] The invention relates to the technical field of bridge tests, in particular to a controllable equivalent preload test method of a bridge cantilever pouring hanging basket. Background technique [0002] Hanging basket construction refers to the use of the hanging basket method when pouring a cantilever beam bridge with a large span, and the cantilever operation can be carried out in sections on the spot. Relying on the movement of the hanging basket, the concrete box girder poured on site is produced in the hanging basket. The construction personnel pour a certain length of box girder each time. After the bridge body hardens and reaches sufficient strength, the hanging basket is pushed to both sides, and then Then pour a new section of the bridge body. This construction method does not need to erect brackets or use large cranes. Compared with other methods, it has the advantages of light structure, simple and convenient assembly, and no pressure. [0...

AI Technical Summary

Problems solved by technology

[0005] 1. Due to the large preload, more sand bags are needed, and the sand bags have a large accumulation area and a high accumulation height, which will affect the arrangement of observation points, so that the settlement cannot be reflected as a whole;

[0006] 2. Due to the need for more sandbags, the entire pressure test period is longer from hanging sandbags, observing settlement, to unloading sandbags;

[0007] 3. The total weight error of the sand bag is relatively large, which affects the accuracy of preloading;

[0008] 4. Sand bags are easy to break, and once the sand bags are damaged, the sand will be wasted, and the bags generally cannot be recycled, resulting in waste of materials and increase in cost

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