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四、用外部预应力加固桥梁用外部预应力加固桥梁可分为用预应力拉杆加固梁桥上部结构与用纵向或横向钢拉杆加固拱桥或桥梁墩台、基础两类。 (一)用预应力拉杆加固梁桥上部结构在梁的受拉区设置预应力拉杆,拉杆在靠近梁端处折向梁端并锚固于梁端,通过横向收紧拉杆(例37、38)或用张拉设备(千斤顶、紧固螺栓或电热法)张拉(例39至44),对拉杠施加预应力,拉杆的偏心压力传至梁体,使梁由受弯构件转换为偏心受压构件,跨中上拱、挠度减小,从而达到提高承载能
Fourth, with external prestressed reinforcement of the bridge with external prestressed reinforcement Bridge can be divided into prestressed tie rod reinforcement of the superstructure and the use of vertical or horizontal steel tie rod arch bridge or bridge piers, the basic two categories. (A) with prestressed tendons to reinforce the superstructure of the beam Prestressed tension rod in the tension zone of the beam, the rod near the end of the beam folded to the beam end and anchored to the beam end, by transverse tension rod (Example 37, 38) Or tensioning devices (jacks, tightening bolts, or electrothermal methods) (examples 39 to 44) to prestress the tension bar, the eccentric pressure of the tension bar is transmitted to the beam, causing the beam to transition from the flexural member to the eccentric Pressure components, the arch in the span, the deflection decreases, so as to improve the carrying capacity