Research and Practice of Rebar Engineering Quantity Calculation for Underground Diaphragm Wall of Intercity Railway Based on BIM and Planar Representation Method of Rebar

Abstract

Underground diaphragm wall is a typical form of deep foundation support for intercity railroad, which has the characteristics of high wall strength, high stiffness and large amount of steel reinforcement. In the process of quantity calculation, there are problems such as unreasonable calculation method of reinforcement quantity and inaccurate and non-uniform calculation results. This paper briefly discusses the research on quantity calculation based on BIM model by combining the classification form of underground diaphragm wall, sorting out the rules of quantity calculation and steel flat method labeling. It also discusses the functions of the rebar information extraction system based on the rebar flat method labeling and the flow structure of the rebar quantity calculation process of intercity railroad underground diaphragm wall based on BIM and rebar flat method labeling. Finally, the accuracy of the calculation results of the diameter, length and number of longitudinal bars, hoop bars and tension bars of the underground diaphragm wall of the intercity railroad is compared with the traditional calculation mode by combining the calculation model. The data showed that the accuracy rate of calculation based on BIM and steel flat marking method was higher than that of traditional calculation mode, and the accuracy rate of BIM and steel flat marking method reached 97.9% on average, while the accuracy rate of traditional calculation mode was only about 85% on average. Therefore, it is verified that the calculation of intercity railroad underground diaphragm wall reinforcement based on BIM and steel flat method has good effect.