先张法是将钢筋(丝)张拉到设计控制应力,用夹具临时固定在台座或钢模上,然后浇筑混凝土,待混凝土达到一定强度(一般不低于设计强度的70%)后,放松钢筋,钢筋回缩,通过混和钢筋间的粘结力,使混凝土构件获得预压应力。本文主要介绍先张法预应力混凝土空心板的施工工艺和质量控制。 The first method is to stretch the steel (wire) to control the design stress, with the fixture temporarily fixed on the pedestal or steel mold, and then pouring the concrete until the concrete reaches a certain strength (usually not less than 70% of the design strength), relax Reinforcing steel and reinforcing steel are retracted, and the prestressing stress of the concrete component is obtained through the bonding force between the reinforcing bars. This paper introduces the first Zhang prestressed concrete hollow slab construction technology and quality control.