Posttensioning method for pretensioning of heavy prestressed structures

Abstract

The invention discloses a post-tensioning method for pre-tightening a heavy-duty prestressed structure. The post-tensioning method comprises the following steps that 1, a mold is consistent with the final size pre-tightened by a pre-tightening winding structure is manufactured, a tension-free steel wire layer winds the mold, and the steel wire layer ring is taken out from the mold; 2, a steel wirelayer ring is heated so as to enable the steel wire layer ring to be attached to the winding structure to be pre-tightened after thermal expansion, the steel wire layer ring which sleeves the windingstructure to be pre-tightened is continued to be heated, and an auxiliary load is applied to the movable end of the winding structure to be pre-tightened to enable the steel wire layer ring to extend; 3, a cushion block group is placed between the movable end and the fixed end of the winding structure to be pre-tightened; and 4, the steel wire layer ring is cooled, and the pre-tightening of the winding structure to be pre-tightened is completed. The post-tensioning method can be suitable for the general heavy structure, the auxiliary load is easy to achieve, the unbalance loading phenomenon is avoided, and the risk of collapse of the pre-tightening winding structure is avoided.

Description

technical field [0001] The invention relates to a pretensioning construction method for heavy and super-heavy prestressed steel wire winding structures, in particular to a post-tensioning method for pretensioning heavy prestressed structures. Background technique [0002] The prestressing of prestressed steel wire wound heavy structures, including bearing frames and containers, is a very complicated and difficult problem. The current winding pretensioning method is the pretensioning method, that is, the tension steel wires with high tension are wound on the pretensioned assembly structure one by one and layer by layer to form a pretensioning force and realize the pretensioning of steel wire winding heavy structures, such as Turntable winding, tangential winding, horizontal robot winding, vertical robot winding, etc. The winding and preloading of a press frame with a heavy weight of more than tens of thousands of tons usually takes more than 4 to 8 months, or even longer. ...

AI Technical Summary

Problems solved by technology

[0016] However, how to generate a hypertension load of 180,000 tons? It's an engineering conundrum

The biggest risk of the post-tensioning method is that the overtension load Pk is too large, causing a series of problems: In addition to the overtension being too large, installing an overtension device, the eccentric load during the overtension process will cause the risk of collapse, or even become impossible

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