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经济的快速发展,使我国的交通运输量呈不断增长的趋势,随着交通运输量的不断加大,运输的载重量也不断的增加。这就对道路和桥梁的荷载能力带来了更大的压力。我国很大一部分桥梁都建于上世纪七十年代,当时由于施工技术及设计水平的限制,桥梁的承载能力都很有限,又经过了这么多年的使用,桥梁开裂、剥落、钢筋锈蚀等情况较为严重,严重制约了交通运输业的发展速度。如果将旧桥危桥拆除重建,不仅需要耗费大量的人力、物力、财力,同时也不符合我国的国情,所以对旧桥危桥进行加固即满足了桥梁的使用价值,同时又提高了桥梁的耐久性。目前,在桥梁加固中体外预应力技术是较为科学和有效的一种加固方法。本文根据目前预应力加固技术的现状,对体外预应力加固技术进行了分析,并进一步对体外预应力技术在桥梁加固中的适用性进行了阐述。
With the rapid economic development, the traffic volume in our country shows an increasing trend. As the volume of traffic increases, the carrying load of transportation has also been constantly increasing. This puts a greater strain on the load carrying capacity of roads and bridges. A large part of our bridges were built in the 1970s. Due to the limitation of construction technology and design level, the carrying capacity of bridges is very limited. After many years of use, cracking, spalling and corrosion of steel bars are more serious Seriously, seriously hampered the development of the transportation industry. If we demolish and reconstruct the old bridge, it will not only cost a lot of manpower, material and financial resources, but also not in line with the national conditions of our country. Therefore, the reinforcement of the old bridge will satisfy the value of the bridge and improve the bridge’s Durability. At present, external prestressing technology in bridge reinforcement is a more scientific and effective reinforcement method. Based on the current status of prestressed reinforcement technology, this paper analyzes the external prestressed reinforcement technology, and further expounds the applicability of external prestressed technology in bridge reinforcement.