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为修建水利水电工程,曾兴建了几座半永久式公路桥。经过数年使用,几座桥的桥面系统已腐朽不堪,必须进行改建。改建时原混凝土桥墩不变,只将上部结构更换为钢筋混凝土结构。改建工程有如下一些特点:1.施工期间人行交通仍应维持;2.断绝交通时间愈短愈好,不影响主体工程的材料供应;3.为了缩短工期和不添购新设备,采用钢筋混凝土预制梁和土法吊装的方法进行施工。兹将各桥的安装方法分别介绍如下:
For the construction of water conservancy and hydropower projects, has built several semi-permanent highway bridge. After several years of use, the deck system of several bridges has been decadent and must be rebuilt. When the original concrete bridge pier unchanged, only the superstructure is replaced by reinforced concrete structure. Reconstruction project has the following characteristics: 1. Passenger traffic during construction should still be maintained; 2. Cut off traffic time as short as possible, does not affect the main project of material supply; 3. In order to shorten the construction period and not to buy new equipment, the use of reinforced concrete Prefabricated beams and soil hoisting method of construction. Here’s how to install the bridges: