桥架变形的修补，现常用的有两种方法，预应力法和火焰纠正法：

There are two methods commonly used to repair the bridge deformation, prestress method and flame correction method

1 、预应力法。在主梁下面设备一套张拉设备，运用拉筋的拉力使主梁发生上拱。这样在主梁下盖板发生压应力，上盖板发生拉应力，这种应力与外载荷构成的应力相反，抵消了部分的作业应力，主梁的受力状况有所改善。所以预应力法有强化主梁和纠正下挠的意图。这种方法简略易行，上拱量简略控制。其缺陷是有局限性，对较凌乱的桥架变形不易纠正。

1. Prestressing method. A set of tensioning equipment is installed under the main beam to make the main beam arch up by using the tensile force of the tie bar. In this way, compressive stress occurs in the lower cover plate of the main beam and tensile stress occurs in the upper cover plate, which is opposite to the stress formed by the external load, offsetting part of the working stress, and improving the stress condition of the main beam. Therefore, the prestressing method has the intention of strengthening the main beam and correcting the deflection. This method is simple and easy to operate, and the amount of camber is simply controlled. Its defect is that it has limitation and is not easy to correct the disordered bridge deformation.

2 、火焰纠正法。火焰纠正法就是对桥架某些部位进行加热，受热部位胀大，但其遭到邻近未加热部位的捆绑，不能清闲胀大，因而，加热部位就被紧缩。冷却后，又发生缩短。加热部位在冷却过程中，拉动周围金属互相靠近，发生缩短力，相当于在主梁中性层下面作用一个偏疼力矩，使主梁康复上拱，抵达纠正结构变形的意图。火焰纠正法的灵活性强，能够纠正桥架结构的各种凌乱变形。

2. Flame correction method. The flame correction method is to heat some parts of the bridge. The heated parts swell, but they are bound by the adjacent unheated parts, so they can't swell freely. Therefore, the heated parts are compressed. After cooling, it shortens again. During the cooling process, the heating parts pull the surrounding metal close to each other, resulting in shortening force, which is equivalent to a painful moment acting under the neutral layer of the main beam, so that the main beam can recover and arch up, reaching the intention of correcting the structural deformation. The flame correction method is flexible and can correct all kinds of disordered deformation of bridge structure.

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