预应力混凝土桥梁悬臂浇筑的线形控制

Linear Control in Cantilever Casting of Prestressed Concrete Bridge

对称悬臂的施工方法在施工期间不影响桥下通航或行车,而且充分利用了预应力混凝土承受负弯矩能力强的特点,提高了桥梁的跨越能力,悬臂施工法的重点是线形控制。本文以天津港南疆复线公路桥预应力混凝土连续梁桥为例,介绍了悬臂施工中挂篮施工、合拢等施工过程中控制线形的方法和措施。

Symmetry cantilever construction method has no influence on navigation under bridge and driving during construction period.This method fully uses the characteristics of higher negative bending moment capacity of prestress concrete which improves the crossing ability.But this method's key point is linear control.For the prestressed concrete continuous beams bridge in Tianjin Port Nanjiang double-line bridge as an example,linear control methods and measures during construction process of hanging basket construction and shut in cantilever construction are showed.