后张法预应力施工控制要点及计算(Construction control points and calculation of post tensioning method).doc
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后张法预应力施工控制要点及计算(Construction control points and calculation of post tensioning method)
后张法预应力施工控制要点及计算(Construction control points and calculation of post tensioning method)
Abstract: This paper summarizes the construction method of prestressed concrete box girder after tensioning method, and analyzes the problems encountered in the construction process.
Key words: post tensioning method, elongation, bellows, steel strand.
Foreword: This paper mainly takes the prestressed tensioning construction of the web beam and the floor beam of the bridge as an example to discuss the construction control of the post tensioning method.
Text:
First, the preparatory work before Zhang Zhang
1 bellows
A bellows arrangement when first reinforced processing ring frame as the positioning frame of the bellows, the vertical distance is 1m, the horizontal position according to the coordinates on the design drawings, the corrugated pipe is penetrated in the inner pipe, corrugated pipe to ensure the quality of the hole.
Two concrete should be checked before the bellows is provided with holes or deformed joints sealed with adhesive tape, and the joint in the anchor plate, must use tape or other things to plug, the waterproof corrugated pipe or mud into the anchor hole.
Three when building concrete, the vibrator shall be prevented from contacting the bellows directly so as to prevent leakage of grout.
2, steel strand
A steel strand is made of phi s15.2 (STM416-94a, 270, low relaxation) with a standard strength of Ryb=1860Mpa.
Two the steel strand should be laid on the clean and tidy surface, and the rust and sundries on the surface shall be removed.
Three wear beam before the steel strand will be straightened out, with tie wire binding, to prevent twisting in steel strands, the tensile stress is uneven, resulting in some steel strand is not up to the tension control stress while others may be pulled.
Four when crossing the beam, the single strand in the steel beam is numbered so that the corresponding number can be reached in tension, and the tension is symmetrical.
3 、 control
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