Emergency Reinforcement Design And Construction Monitoring Of Zhenjiang Yueduhui Deep Foundation Pit Supporting Structure

In order to ensure the effective use of underground space in the process of urbanization,deep foundation pit engineering has gradually become a research hotspot for engineering issues.How to ensure the safety and stability of deep foundation pits while meeting economic requirements,which makes the design of deep foundation pit supporting structures And construction has become a major and difficult problem in actual engineering.This article takes the deep foundation pit of Zhenjiang Yueduhui 2#building as the background,and introduces the project's last 8 years.The original support structure has long expired and has failed,and at the same time,the water pipe under the footpath north of the foundation pit is frozen and cracked.Under the circumstances,there is a danger in the foundation pit.In response to the danger,immediately backfill the P?N section with earthwork,and at the same time unload the soil on the slope of the foundation pit;pour concrete into the sinking part of the sidewalk,and cooperate with the municipal pipe network unit to carry out the sinking part of the ground Mechanical demolition,earthwork excavation,transportation and unloading.According to the design requirements and the current situation,a design plan for emergency reinforcement of the P-N section deep foundation pit supporting structure was formulated.The main contents are as follows:1)According to the design principles of deep foundation pit support structure,the advantages,disadvantages and applicable conditions of several common support structures are introduced.Based on the actual situation of Zhenjiang Yueduhui,including geological survey report,design requirements,and surrounding site environment,two rescue and reinforcement schemes for the supporting structure were proposed.After comparative analysis,a deep foundation pit supporting scheme was initially selected.2)Reinforcement design of the supporting structure using Lizheng software,the construction parameters of the supporting system were determined,and the stability was calculated,the feasibility of the scheme was verified,and the final construction scheme of the supporting structure was determined:Type ? 12m long Larson steel sheet piles are supported by a rotary jet anchor cable and a diagonal brace.The platform is reinforced with slope protection soil nails.3)Aiming at the supporting structure in this area of P?N section,this article describes the construction process,foundation pit excavation steps,and drainage reduction measures.A monitoring scheme for the foundation pit that meets the requirements of the project was implemented.The monitoring content,monitoring methods and techniques,the layout of monitoring points,and the collection of monitoring data were provided to provide guidance for the reinforcement of deep foundation pits.4)Based on the analysis of the monitoring data,the reinforcement method adopted in the deep foundation pit effectively prevented the danger from aggravating and did not cause serious damage to the surrounding environment.This indicates that the support and reinforcement method is safe and reliable,ensuring the foundation pit Security and stability.The emergency measures proposed for the dangerous situation of the foundation pit and the design of the reinforcement and reinforcement of the supporting structure provide a reference for projects with similar situations.Figure[29]table[26]reference[41]...