近几年来,全国都在大力推广木桥防腐工作。由于公路桥梁工程的分散,工地一般都缺乏适当的机械设备,因而所采用的防腐方法,大部分是涂抹氟化钠防腐浆膏。这种方法适用于含水量高的木材,但是我们实际用到桥上去的木料,不一定都是潮湿的;同时木材砍伐以后,经过搬运、贮放到进行防腐,中间须要几个月、一年甚至几年。在这一段时间里,很难避免木腐菌的感染。如果木腐菌已经滋蔓到木材内部,仅在其表面涂抹一层浆膏,作用是很小的。我们有时从桥梁上更换下来的捍件中发现,涂抹了浆膏的木材,表面虽然完整无损,而在距离表层约半公分左右的内圈,已全部腐烂。为了增高防腐的效果,1956年夏季,我们试用了烤 In recent years, the country has been vigorously promoting the anti-corrosion work of wooden bridges. Due to the decentralization of highway and bridge projects, the construction site generally lacks adequate mechanical equipment. Therefore, most of the anti-corrosion methods used are sodium fluoride anti-corrosion pastes. This method is suitable for wood with high moisture content, but we actually use the wood on the bridge, not necessarily all wet; at the same time, after the timber is cut, it is handled and stored until it is preserved for several months or a year. Even several years. During this time, it is very difficult to avoid wood rot infection. If wood rot bacteria have spread inside the wood, smearing a layer of paste on its surface is very small. We sometimes found from the bridge pieces that were replaced on the bridge that the surface of the wood that had been smeared was intact, but it was completely rotted in the inner circle that was about half a centimeter away from the surface. In order to increase the anti-corrosion effect, in the summer of 1956, we tried baking