No. 0 block construction bracket and reverse tension preloading method thereof

Abstract

The invention discloses a No. 0 block construction bracket and a reverse tension preloading method thereof. By virtue of reverse tension of jacks, the measurement of force borne by each important joint and the measurement of elongation of tie rods, the bracket construction is realized gradually and quickly; compared with a traditional construction method, the No. 0 block construction bracket and the reverse tension preloading method thereof save the construction time and reduce the construction difficulty; steel strands are saved and the cost input is reduced; materials and equipment used areall reusable so as to avoid extra waste of the steel strands; the application range is expanded and restrictive conditions are reduced; the No. 0 block construction bracket and the reverse tension preloading method thereof can be applied to all projects which are restricted by the environment and which can not be constructed according to the conventional preloading method; the reverse tension preloading method disclosed by the invention can detect many joints, and can simulate the state more effectively; and the preloading of each key joint is performed through the jacks so as to ensure the engineering quality and effectively solve the preloading problems in the construction process.

Description

technical field [0001] The invention relates to the technical field of high pier construction, in particular to a 0# block construction bracket and a reverse tension preloading method thereof. Background technique [0002] With the rapid development of economy and technology, the construction of transportation infrastructure has also developed rapidly. The development of roads and bridges has promoted the intercommunication between various regions. In more and more bridge constructions, it is necessary to apply preloading to bridges. Do pre-stress tests. [0003] For example, in the construction of the Zaodu River Bridge in Chongqing, the height of the main pier body of the pier is up to 83 meters, and the safety risk of preloading on the top of the pier is high, and the steel strand bundle needs to be installed vertically upwards, which involves anchoring through the bottom of the pier and on the top of the pier The tools are not positioned properly, and there is a risk of...

AI Technical Summary

Problems solved by technology

During the process of staged tensioning and decompression, the large retraction of the steel strand leads to a large loss of prestress, and the pressure of the process stage is difficult to control. It is impossible to clearly judge the retraction of the anchorage, the retraction of the steel strand and the sinking of the bracket. ;

[0008] When the steel strand is initially installed in place, due to the vertical natural slack and inclination, the stress at multiple points is uneven, resulting in eccentric loads, which will lead to dangerous accidents of the bracket overturning, unless pre-tightening work and equipment are required. Synchronous tension controller to ensure that the force of each point is uniform, and the difficulty of process operation cannot be realized

[0009] Therefore, in order to solve the above problems, for the current increasing number of high piers and long-span bridge construction projects, the existing conventional preloading method has obvious deficiencies, and it cannot be realized. A kind of equipment suitable for this type of construction is urgently needed The preloading method can improve the existing construction technology and meet the needs of high piers and long-span bridge construction

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