A controllable equivalent preload test method for bridge cantilever pouring hanging basket

Abstract

The invention discloses a controllable equivalent preload test method for bridge cantilever pouring hanging baskets. The invention comprises the following steps: 1) at least one anchor is arranged symmetrically along the longitudinal direction of the bridge at both transverse ends of the top surface of the bridge cap; device, and then symmetrically install the through-type jack on the hanging baskets on both sides of the main beam, and then connect the telescopic end of the through-type jack with the corresponding anchoring device through the steel strand, and connect the steel strand through the through-type jack 2) The through-hole jacks on the hanging baskets on both sides are synchronously increased step by step, and the loading deformation value is measured; 3) Unloading is carried out step by step after observing that the hanging basket has no continuous deformation development, and the unloading deformation value is measured; The core jack tightens the steel strand to apply pressure, the load is equivalent and controllable, the data is more real and reliable, and the preloading accuracy is improved, the test cost is reduced, and the test 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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