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在养护有桥面铺装的简支梁木桥中,未经防腐(化学)处理的极边纵梁靠外的一面,和露在外边的桥面板两末端,往往首先腐烂。因为板的梢端和梁面经常直接受到大气的作用,雨水和雪的自然侵袭,又加太阳光直接照射,木材就时干时湿,再加东北气候三寒四温,木材受潮后也发生冻胀和融化,木材表面就逐渐裂开,裂缝也逐渐扩大,表面即行起皮和剥落,梁底也发生腐圬、纵梁负载力即显著削弱。养护抽换时需要拆卸栏杆护轮木,挖开桥面铺装,部分镶接桥面板,费工又费
Of the simply supported beam bridges with decks, unprotected (chemical) treatment of the outer side rails and the exposed ends of the deck tend to first decay. Because the plate tip and beam surface are often directly affected by the atmosphere, the natural invasion of rain and snow, plus direct sunlight, the wood is dry and wet, plus the northeast climate, three cold and four warm, wood moisture also occurred after the frost heave and thaw , The surface of the wood gradually cracked and the cracks gradually expanded. The surface was peeled off and peeled off, and the bottom of the beam was also rotten. The load on the side beams was significantly weakened. Need to dismantle the handrail when the maintenance of pumping care round wood, digging the bridge deck pavement, part of the bridge deck installation, work and fee