265438+the beginning of the 20th century is an important period for the great development of urban subway, various tunnel projects and underground space projects. In order to solve major problems such as urban traffic, parking, trade, communication, water supply and power supply, people will vigorously develop and utilize underground space. With the development of urban construction, underground projects are built in urban areas, especially in the urban center with dense ground buildings and complex underground pipelines. Ground subsidence caused by subway construction may endanger the safety of surrounding buildings.
Therefore, it is necessary to carry out safety management on subway construction. Before construction, the structure, type, age and service condition of the buildings along the project must be clearly understood, and the buildings should be evaluated before construction to determine the existing deformation and residual deformation resistance of the buildings. Secondly, monitor during the construction process, judge according to the evaluation index, and evaluate the building. In this way, reasonable technical decisions and on-site emergency measures can be made in view of the influence of urban underground engineering construction on buildings. Finally, the building is evaluated after construction.
At present, there are many literatures about the evaluation of the influence of subway construction on buildings at home and abroad. Domestic literature describes the influence of subway construction on buildings and the protective measures taken for buildings, all of which appear in the form of individual cases, and does not systematically introduce how to assess the safety risk of buildings, nor does it basically involve how much residual deformation buildings can withstand during subway construction (that is, the assessment of the current situation of buildings). Therefore, in view of the above points, the steps of building safety risk assessment are put forward from the aspects of the influence and management of subway construction on buildings, which can provide reference for other similar projects.
2 Construction safety risk assessment
In the process of subway construction, due to the disturbance of the stratum, it will inevitably have a certain degree of influence on the buildings around the subway structure. In order to ensure the safe use of buildings during subway construction, it is necessary to investigate and evaluate the current situation of buildings, predict the scope and degree of influence of subway construction on buildings, and take corresponding treatment measures in time, so that subway construction can be carried out safely and orderly on the premise of ensuring the normal operation of buildings. Therefore, the following five aspects should be done: ① investigation of building materials; (2) Assessment of the current situation of buildings; ③ Influence and prediction of subway construction on adjacent strata and buildings; (4) Establish the settlement control standard for subway construction; ⑤ Formulation of control procedures during subway construction.
2. 1 building data survey
The purpose of data investigation is to accurately grasp the actual data of the building and its spatial relationship with the subway structure. The investigation of information includes the following aspects.
2. 1. 1 Survey of Building-related Information
The survey data related to the building mainly include: original design drawings and as-built drawings, engineering geological reports (for the data not available or lacking before, supplementary survey is needed), previous reinforcement and reconstruction design drawings, accident handling reports, completion acceptance documents and inspection and observation records; Original construction situation (original construction data); Conditions of use of the building; Conduct preliminary inspection, inspection and analysis according to existing data and physical objects.
2. 1.2 information survey on subway structure
The data investigation related to the subway structure mainly includes: plane layout; Geological data map of construction area; Design data, including the form and size of longitudinal section and transverse section of the station; The position relationship diagram with the building; Detection and analysis of structural material properties and geometric parameters, calculation and analysis of structural members, field measurement, and structural inspection when necessary.
The above safety risk management of adjacent buildings in subway construction is collected and sorted by Zhong Da Consulting. More architectural knowledge, such as "Safety Risk Management of Adjacent Buildings in Subway Construction", can pay attention to the column of Zhong Da Consulting Industry. "It is easy to win the bid with a little construction." For information about construction enterprises, award-winning achievements, builders under construction, enterprise honors, qualification grades, industrial and commercial information, legal proceedings, etc., please visit Zhong Da Consulting, Construction Link or follow the official account of Zhong Da Consulting WeChat for enquiries.
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