Overview
With the development of urban construction, the construction of high-rise buildings and subways has gradually entered the era of popularization, and there are more and more projects involving deep foundation pits, and the quality requirements for its construction are getting higher and higher. In particular, the requirements for the safety and stability of the foundation pit are particularly important. The first task after the start of the construction project is to carry out the foundation construction. The monitoring of changes in soil properties, environment, adjacent buildings and underground facilities caused by the construction process has become an indispensable and important part of engineering construction.
The collapse of the pit wall causes the displacement and subsidence of the soil around the foundation pit, and the foundation of the building (structure) adjacent to the foundation is hollowed out and unstable, resulting in cracking, tilting and uneven sinking of the upper facilities and buildingsCause cracking and partial collapse of the pavement of adjacent highways, thereby affecting driving safety;It leads to the hollowing out of adjacent pipelines and foundations, and the fracture of pipe trenches.
Monitoring projects
Based on the structural safety level, geological environment and surrounding environment of the foundation pit, with reference to the GB50497-2009 regulations of the Technical Code for Monitoring of Building Foundation Pit Engineering, and combined with the project implementation objectives and monitoring requirements, other monitoring indicators can be selected and monitored according to the grade of the foundation pit and the specific construction requirements.
Foundation pit soil
Earth pressure, pore water pressure, vertical displacement of soil layering, settlement of pit bottom columns, and horizontal displacement of deep soil layers.
Supporting structure
Deep horizontal displacement of the retaining wall, vertical horizontal displacement of the top of the wall, internal force of the envelope structure, internal force of support, internal force of anchor.
The natural environment
Temperature, rainfall, water table.
Surroundings
Deformation of surrounding buildings, deformation of surrounding pipelines, and deformation of the surface at the edge of the pit.
Monitoring the selection of sensors and acquisition equipment
Monitoring Instruments:Earth pressure gauge, piezometer, thermometer, multi-point displacement gauge, magneto-induced settlement meter, static level, fixed inclinometer, embedded strain gauge, vibrating wire reinforcement gauge, bolt dynamometer, steel plate strain gauge, etc.
Acquisition Equipment:MCU automatic acquisition equipment, GDA16 single-point acquisition module, reader.
Monitoring system composition
Monitoring cloud platform
Features:Project management, multi-level users, real-time monitoring, collection equipment management, historical data, measurement point management, report management, alarm management, portfolio management, network card recharge, camera monitoring.
Advantages:Modular, cloud-based, regional, and intelligent.