Research On Construction Control Technology Of Beijing-baotou Separately Railway Overpass Constructed With Rotation Method

With the large-scale infrastructure construction in our country, it is confrontedwith building a large number of bridges to overpass the obstacle, especially a railwayor highway. In order to reduce the impact on the existing lines and ensure the crossingsafety and economic applicability, rotation construction of bridge is widely used inChina.Beijing-Baotou railway separately overpass is a bridge across Beijing-Baotourailway, which span is2×75m. and the structure type is prestressed concrete in theform of variable cross-section T-rigid frame, firstly It is constructed parallel onrailway with scaffold erection, then parallel rotation across the railway, rotation angleis62.5degrees.This paper relies on Beijing-Baotou railway separately overpass rotationconstruction, through FEM analysis and on-site construction monitoring andsurveillance studies of twist process, described the key technology solutions ofBeijing-Baotou railway separated overpass rotation construction control, and it willprovide a reference for other similar bridge construction control. The main contentsof this article are as follows:(1)This paper introduces the principles and methods of rotation construction, aswell as the main process of Construction control, in order to determine the mainresearch content of this article.(2) According to the characteristics of Beijing-Baotou railway separatelyoverpass rotation construction, this paper analyses the emphasis and difficulty in theconstruction process simulation. It uses Midas Civil to make spatial modelinganalysis，which determine a reasonable bridge state and the linear and stress results ofconstruction phase, in order to guide the construction. At the same time, it usesAbaqus to establish the detail analysis model of ball joint structure, which analysisthe stress state of ball joint is done.(3) This paper introduces the linear monitoring control principles of T-type rigidframe swivel bridge and provide pre-camber instructions to guide site construction. Atthe same time, according to the actual construction monitor the linear control parameter, as well as the conclusions of the linear control is given.(4) This paper introduces the stress monitoring method of the control section andthe key point of sensor placement of T-type rigid frame bridge. Then according to thestress value of monitoring on the key sections in construction process(5) This paper introduces the rotation construction monitoring technology ofBeijing-Baotou railway separately overpass. It emphasis on the stress monitoring ofthe under turnable, the stress monitoring of the bottom of the pier, the unbalancedtorque test of T-type rigid frame, as well as the principles and methods of processmonitoring, in order to ensure that rotation process is smooth and safe.In summary, the findings and conclusions drawn by the technology researchthrough the Beijing-Baotou railway separately overpass rotation construction controlcan provide guidance for similar bridge design, construction and operationsmanagement departments and the corresponding optimal management.