Deep building pit trussed-beam inner support integral application pre-stress method
A truss-type, prestressed technology, applied in the engineering field, can solve the problems of small influence range (generally about 5-6m, poor integrity of prestressing, inability to apply prestressing, etc.), and achieves wide application range, long installation time, The effect of large compression deformation
Inactive Publication Date: 2008-09-03
CHINA FIRST METALLURGICAL GROUP
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The present invention relates to a method for wholly exerting pre-stress to the trussed internal bearing in the deep foundation pitch. The method comprises the following steps: installing an internal bearing which is composed of a principal top brace, a diagonal rod and a web rod or composed of a principal top brace and a web rod, and installing the trussed internal bearing between two pit walls of the deep foundation pitches; (2) installing a pre-stress force-transferring seat along the axial direction of the principal top brace on each principal top brace; (3) arranging a jack along the axial direction between two pre-stress force-transferring seats of each principal top brace; and (4) cutting off the principal top brace between two force-transferring seats of each principal top brace, exerting pre-stress with the jack, and when the pre-stress which should be exerted is obtained, reinforcing and welding the gap which is between the fracture surface of the cut principal top brace and is generated by exerting pre-stress with the steel material. The method has the advantages of quick installation, short time period for exerting pre-stress, being able to counteracting the compressing deformation of the member bar, and being able to quickly and effectively control the deformation in the deep foundation pitch.
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