The East River Bridge With Rigid Reinforced Steel Truss Construction Technology

Dongjiang bridge, which is the first double layer highway bridge, is located in shijie to across south tributary of Dongjiang river on north end of expressway between Shenzhen and Dongguan.The three-span continuous rigid suspension reinforced steel truss bridge has the span allotment of 112m+208m+112m and a total length of 432m. The main truss structue with three truss in the horizontal has a hight of 10m and a spacing of 18m, it use truss of warren type with vertical rod,the quadratic parabola stiffening string is connected with up chord by suspender.Dongjiang bridge has a beautiful modeling, novel structure,complex mechanical properties, unique design. Manufacture and construction of steel girder is very difficult:erection and closure need high precision;many closure points; linear control is very important and must be very precise.Construction of steel girder of Dongjiang bridge should be controlled to guarantee the quality of bridge construction and ensure the closure with security and smothness and high precision. Some construction techniques are discussed and summarized and formed supporting construction techology, such as the bent erection method used on side span, the balanced cantilever construction method used for center span erection and closure,the techology of erection and closure of stiffening string.And discussed in detail of the stability,linear control and adjustment of vertical and horizontal internal force of chord of main span and stiffening string when they are on construction progress,then given the solutions of these problems.The results of this study has practical significance to improve the construction technology and innovation of bridge engineering and can also produce huge economic and social benefits,what's more,the construction experience can provide references for bridges of the same type in the futrue.