Research on internal force of 3-D modeling of fish belly beam supported in foundation pit based on computer intelligent stress monitoring system

Abstract

High prestressing force stiffness fish belly beam tool type combined internal support system, referred to as IPS construction method, is a new type of internal support structure system for deep foundation pit support, which is developed based on the principle of prestress and aiming at the shortcomings of traditional concrete internal support and steel support through a large number of engineering research and practical application, it is composed of fish belly beam (high-strength and low relaxation steel strand as the upper chord member. H-shaped steel as the stress beam, and H-shaped steel support beam with different length, butt brace, corner brace, column, cross beam, pull rod, triangular joint, preloading and jacking device and other standard components, and prestress is applied to form a plane restressed support system and three-dimensional structure system. Compared with the traditional concrete internal support and steel support, it greatly improves the overall stiffness and stability of the support system. Combined with the remote real-time monitoring system, it can effectively and accurately control the displacement of the foundation pit and greatly reduce the deformation of the foundation pit. This technology has made a major breakthrough in the internal support technology of deep foundation pit support. It is the most advanced internal support technology in the world. In this paper, a 3-D model of fish belly beam foundation pit support system is established completely, the stress characteristics of the support system are analysed by computer intelligent stress monitoring system, and the distribution areas of prestress and internal support stress are summarized, which can be used as a reference for this type of engineering experience in the future.