Canal engineering cofferdam construction safety assessment method

Abstract

The invention relates to the technical field of canal engineering, and discloses a canal engineering cofferdam construction safety assessment method which comprises the following steps: step 1, data collection and analysis design; step 2, site investigation; 3, carrying out numerical simulation and evaluation; 4, constructing a water level prediction model; 5, performing model analysis; step 6, constructing a BIM simulation model; step 7, formulating risk control measures; 8, on-site real-time intelligent safety monitoring is carried out; and step 9, risk assessment. According to the canal project cofferdam construction safety assessment method, by adopting the BIM technology, finite element analysis and other advanced technologies, the assessment accuracy and reliability are improved, the risk caused by the technical complexity is reduced, by adopting a modern monitoring and early warning system, the manpower demand is reduced, the cost is reduced, and by adopting the real-time data analysis and monitoring and early warning system, the construction safety of the cofferdam is improved. And in cooperation with an unmanned aerial vehicle and site investigation equipment, the construction flexibility is improved, and the response speed is increased.

Description

Technical Field

[0001] The invention relates to the technical field of canal engineering, and in particular to a method for safety assessment of cofferdam construction of a canal engineering project. Background Art

[0002] The cofferdam construction of canal projects is a commonly used construction method in water conservancy projects. It is mainly used for water surface blocking, water flow control and other operations in the fields of construction and water conservancy projects. The canal is an important part of the transportation infrastructure and plays an important role in promoting economic development and strengthening cultural exchanges. With the vigorous development of my country's inland waterway transportation, canal construction has been continuously strengthened, and cross-basin water system connectivity and the formation of a high-level waterway network have gradually been achieved. The cofferdam is a temporary retaining structure used in the construction of water conservancy projects such as canals. Its main function is to prevent water and sediment from entering the construction site of the project so that construction work can be carried out in a dry foundation pit. During the canal construction process, the cofferdam can provide a dry and safe environment for construction work to ensure smooth construction.

[0003] The cofferdam construction of the canal project requires a safety assessment of the construction to ensure that it is completed smoothly and safely. The current assessment methods require a large amount of manpower, material and financial resources. At the same time, since the cofferdam construction is greatly affected by natural environmental factors such as water flow, geological conditions, and climatic conditions, and the cofferdam construction is complex and variable, the conventional safety assessment methods are highly complex and have poor accuracy and reliability. With the advancement of science and technology, they can no longer meet the current needs of the canal project cofferdam construction. Summary of the invention

[0004] In view of the shortcomings of the existing technology, the present invention provides a canal engineering cofferdam construction safety assessment method, which has the advantages of reducing manpower requirements, lowering costs, improving the accuracy and reliability of assessment, and reducing the risks brought by technical complexity by integrating advanced technologies and scientific management strategies. It solves the problems of large investment in manpower, material and financial resources, high complexity, and poor accuracy and reliability.

[0005] In order to achieve the above-mentioned purpose of reducing manpower requirements, reducing costs, improving the accuracy and reliability of assessments, and reducing the risks caused by technical complexity by integrating advanced technologies and scientific management strategies, the present invention provides the following technical solutions: A method for safety assessment of canal engineering cofferdam construction, comprising the following steps: Step 1: Collect information and analyze the design. Collect the design documents, construction drawings and construction records of the cofferdam in the canal project, analyze the design and construction quality of the cofferdam, and identify possible safety hazards; Step 2: Site survey: Conduct site survey to observe the surrounding environment of the cofferdam and assess its impact on the safety of the cofferdam. At the same time, conduct real-time survey during the construction process. Step 3: Numerical simulation and evaluation: numerical simulation is carried out based on the data and actual survey results to simulate the mechanical and hydrodynamic loads on the cofferdam under different scenarios, and then the stability and safety of the cofferdam are evaluated based on the simulation results; Step 4: construct a water level prediction model, construct a water level prediction principal component analysis model, obtain water level prediction results, use a finite element model to simulate the impact of water level changes on the stability of the steel cofferdam foundation pit during the construction process, and obtain internal stress and displacement simulation numerical data; Step 5: Model analysis: Conduct sensitivity analysis on the finite element model to determine the key factors affecting the stability of the steel cofferdam foundation pit. Perform time-varying reliability analysis on the steel cofferdam foundation pit based on the water level prediction results, simulated numerical data and key factors to obtain the time-varying reliability analysis results. Step 6: Build a BIM simulation model, obtain BIM simulation monitoring data, and conduct a safety assessment on the steel cofferdam foundation pit in combination with the time-varying reliability analysis results; Step 7: Formulate risk control measures, including repairing and reinforcing the cofferdam structure, strengthening the monitoring and early warning system, etc., and timely discover and deal with potential problems through real-time monitoring and data analysis to ensure the smooth progress of the project; Step 8: On-site real-time intelligent safety monitoring: Based on the model and analysis, the site is monitored in real time. The monitoring content includes stress changes, deformation degree and on-site real-time video monitoring of the cofferdam structure. The data is transmitted to the cloud monitoring platform in real time through the wireless network for data analysis and processing, so as to timely discover potential problems and take measures; Step 9: Risk assessment. When risks arise, a detailed risk assessment is conducted in combination with the previous models, monitoring and analysis to identify the risks faced during the construction process and implement them according to the corresponding emergency plans previously specified.

[0006] Preferably, the site survey in step 2 can specifically use geological radar, drilling equipment, underwater sonar and other equipment to conduct geological condition survey to evaluate the geological conditions of soil stability and groundwater level; use hydrological monitoring equipment to conduct real-time monitoring of water level, flow rate and water quality; use meteorological station equipment to collect temperature, rainfall and wind data.

[0007] Preferably, the site survey in step 2 also includes using drones for terrain mapping and construction progress monitoring to quickly obtain high-precision terrain data of the construction site and to survey the cofferdam construction process in real time to ensure that the construction proceeds as planned.

[0008] Preferably, the construction of the water level prediction model in step 4 specifically requires the collection of historical water level data, the extraction of characteristic vectors of factors affecting water level changes, the use of support vector machines for water level prediction, and the comprehensive consideration of complex hydrological scenarios and weather changes to perform medium- and short-term water level predictions.

[0009] Preferably, the model analysis in step 5 specifically includes using finite element software to establish a three-dimensional model of the cofferdam, considering various loads such as soil pressure, hydrostatic pressure and water flow force, performing force analysis, and analyzing its stability and deformation characteristics by simulating the cofferdam structure at different construction stages to ensure that the design meets safety requirements.

[0010] Preferably, constructing the BIM simulation model in step 6 also includes creating a BIM model of the cofferdam, adding uncertain factors related to the stability of the cofferdam, defining simulation scenarios, and obtaining stability response data of the foundation pit at different time points.

[0011] Preferably, the formulation of risk control measures in step 7 also includes realizing remote monitoring of the cofferdam construction process and issuing timely warnings when the system detects abnormal conditions. At the same time, it is also necessary to join the national geological disaster meteorological forecast and warning system to achieve an organic combination of geological disaster investigation and monitoring, forecast and warning, and emergency response, and improve the accuracy and practicality of geological disaster forecast and warning work.

[0012] Preferably, each of the steps can form an evaluation report file, and the report file is divided into paper and electronic files, and the electronic file is uploaded to the cloud for backup storage.

[0013] Preferably, the assessment report file may include text and model images to display the contents of the assessment report, and transmit the contents to a display screen for image display to provide an intuitive understanding of the construction safety situation.

[0014] Preferably, during the construction period, the construction safety assessment results need to be converted into a detailed safety construction plan, and irregular safety education and training should be conducted for construction personnel and management.

[0015] Compared with the prior art, the present invention provides a canal engineering cofferdam construction safety assessment method, which has the following beneficial effects: 1. The safety assessment method for the cofferdam construction of the canal project has improved the accuracy and reliability of the assessment and reduced the risks brought by technical complexity by adopting advanced technologies such as BIM technology and finite element analysis. It has reduced manpower requirements and costs by adopting a modern monitoring and early warning system. It can better adapt to environmental changes through real-time data analysis and monitoring and early warning systems, and improve the flexibility and response speed of construction by cooperating with drones and site survey equipment. It provides more comprehensive risk control measures through risk event identification, risk level assessment and safety risk analysis, including repairing and reinforcing the cofferdam structure, strengthening the monitoring and early warning system, etc., thereby reducing safety risks.

[0016] 2. The canal project cofferdam construction safety assessment method provides a more scientific model and analysis method by utilizing finite element model simulation and BIM simulation model, which can accurately quantify and evaluate the changes in foundation pit stability. By constructing a water level prediction model and a BIM simulation model, combined with a geological disaster meteorological forecast and early warning system, it can understand in advance the water level changes that may be encountered during deepwater cofferdam construction, discover potential risks in a timely manner, and then take corresponding measures to ensure construction safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic flow chart of a canal engineering cofferdam construction safety assessment method proposed in the present invention. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] See also Figure 1 , a canal engineering cofferdam construction safety assessment method, comprising the following steps: Step 1: Collect information and analyze the design. Collect the design documents, construction drawings, construction records and other materials of the cofferdam in the canal project, analyze the design and construction quality of the cofferdam, and identify possible safety hazards. The materials also include quality inspection reports, safety assessment reports and environmental protection assessment reports, etc., to ensure the safety and compliance of the cofferdam construction; Step 2: Site survey: Conduct site survey to observe the surrounding environment of the cofferdam and evaluate its impact on the safety of the cofferdam, such as soil stability, wave impact, surge, storm surge and other factors. At the same time, conduct real-time survey during the construction process. The site survey can use geological radar, drilling equipment and underwater sonar and other equipment to conduct geological condition survey to evaluate the stability of soil and the geological conditions of groundwater level; use hydrological monitoring equipment to monitor water level, flow rate and water quality in real time; use meteorological station equipment to collect temperature, rainfall and wind data. Site survey also includes the use of drones for terrain mapping and construction progress monitoring, quickly obtain high-precision terrain data of the construction site, and survey the cofferdam construction process in real time to ensure that the construction is carried out as planned; Step 3: Numerical simulation and evaluation. Numerical simulation is performed based on the data and actual survey results to simulate the mechanical and hydrodynamic loads on the cofferdam under different scenarios. Then, based on the simulation results, the stability and safety of the cofferdam are evaluated. Specifically, a three-dimensional model of the cofferdam is established using finite element analysis software (such as ANSYS) to simulate the stress of the cofferdam under external loads such as earth pressure, hydrostatic pressure and water pressure. The interaction between steel sheet piles, purlins, internal supports and soil layers is considered to analyze the strength, stiffness and overall stability of the cofferdam structure. Different construction processes are simulated, such as internal support, bottom concrete construction, water pumping and mud suction and other key construction conditions. The deformation and stress of the cofferdam structure are analyzed. Based on the on-site measured water pressure data, the wave dynamic load on the main wave-facing surface of the cofferdam is calculated. A three-dimensional numerical model of the cofferdam is established using numerical simulation software (such as AQWA) to calculate the wave dynamic load on the cofferdam and compare it with the measured data to verify the accuracy of the simulation. Step 4: Construct a water level prediction model, construct a water level prediction principal component analysis model, obtain water level prediction results, use a finite element model to simulate the impact of water level changes on the stability of the steel cofferdam foundation pit during the construction process, obtain internal stress and displacement simulation numerical data, and construct a water level prediction model. Specifically, it is necessary to collect historical water level data, extract the characteristic vector of factors affecting water level changes, use support vector machines to predict water levels, and comprehensively consider complex hydrological scenarios and weather changes to make medium- and short-term water level predictions; Step 5, model analysis, sensitivity analysis of the finite element model, determine the key factors affecting the stability of the steel cofferdam foundation pit, and conduct time-varying reliability analysis on the steel cofferdam foundation pit based on the water level prediction results, simulated numerical data and key factors to obtain the time-varying reliability analysis results. The model analysis specifically includes using finite element software to establish a three-dimensional model of the cofferdam, considering various loads such as soil pressure, hydrostatic pressure and water flow force, and conducting force analysis. By simulating the cofferdam structure at different construction stages, its stability and deformation characteristics are analyzed to ensure that the design meets safety requirements. By using finite element model simulation and BIM simulation model, a more scientific model and analysis method is provided, which can accurately quantify and evaluate the changes in the stability of the foundation pit, and by constructing a water level prediction model and a BIM simulation model; Step 6: Build a BIM simulation model, obtain BIM simulation monitoring data, and conduct a safety assessment on the steel cofferdam foundation pit in combination with the time-varying reliability analysis results. Building a BIM simulation model also includes creating a BIM model of the cofferdam, adding uncertainties related to the stability of the cofferdam, defining simulation scenarios, obtaining stability response data of the foundation pit at different time points, and creating a three-dimensional model of the cofferdam construction to achieve virtual simulation of the construction process, discover and solve problems in the design in advance, and optimize the construction plan. Specifically, in the construction of bridge steel cofferdams, BIM technology can be used for collision inspection to ensure the stability of the structure and optimize complex nodes. BIM technology can also be combined with the model for information query to provide convenience for construction personnel and avoid errors. By adopting advanced technologies such as BIM technology and finite element analysis, the accuracy and reliability of the assessment are improved, and the risks brought by technical complexity are reduced. By adopting modern monitoring and early warning systems, manpower requirements are reduced and costs are reduced. Step 7: Formulate risk control measures. Formulate corresponding risk control measures, including repairing and reinforcing the cofferdam structure, strengthening the monitoring and early warning system, etc., and through real-time monitoring and data analysis, timely discover and deal with potential problems to ensure the smooth progress of the project. Formulating risk control measures also includes realizing remote monitoring of the cofferdam construction process and issuing early warnings when the system detects abnormal conditions. At the same time, it is also necessary to join the national geological disaster meteorological forecast and early warning system to achieve an organic combination of geological disaster investigation and monitoring, forecast and early warning, and emergency response. Understand in advance the water level changes that may be faced in the construction of deep-water cofferdams, discover potential risks in a timely manner, and then take corresponding measures to ensure construction safety and improve the accuracy and practicality of geological disaster forecast and early warning work. Specifically, identify major sources of danger in cofferdam construction, such as cofferdam collapse, lifting and hoisting, temporary electricity use, pipeline protection and other risk factors, and conduct safety technical training for construction personnel. Hand over the details to ensure that the workers understand the construction procedures and existing dangerous factors. Set up full-time safety officers for supervision and urge the workers to wear labor protection equipment and life jackets correctly. When entering the construction site, they must wear safety helmets and other personal labor protection equipment, and be equipped with lifebuoys and life jackets to avoid the safety risks that construction workers may face due to lack of training or insufficient protective equipment, as well as the safety hazards of stone cage stacking collapse, drowning and equipment falling into the river. Strengthen the supporting structure of the cofferdam, use reinforced steel components or reinforced concrete structures to increase the stability of the cofferdam, and avoid the risks of cofferdam safety, water construction and equipment safety in the construction of steel sheet pile cofferdams. When the safety superheight of a certain section of the cofferdam is insufficient, artificial sub-weirs or sand bags can be placed on the top of the embankment for reinforcement according to the stability and soil conditions of the cofferdam, so as to avoid the cofferdam construction relying on soil and geological conditions to ensure the stability of the cofferdam, and the risk of river embankment collapse; Step 8: On-site real-time intelligent safety monitoring. Based on the model and analysis, real-time intelligent safety monitoring is carried out on the site. The monitoring content includes stress changes, deformation degree and real-time video monitoring of the cofferdam structure. The data is transmitted to the cloud monitoring platform in real time through the wireless network for data analysis and processing, so as to timely discover potential problems and take measures. Through real-time data analysis and monitoring and early warning systems, it can better adapt to environmental changes, cooperate with drones and site survey equipment, improve the flexibility and response speed of construction, and provide more comprehensive risk control measures through risk event identification, risk level assessment and safety risk analysis, including repairing and reinforcing cofferdam structures, strengthening monitoring and early warning systems, etc., so as to reduce safety risks. Step 9: Risk assessment. When risks occur, a detailed risk assessment is conducted in combination with the previous models, monitoring and analysis to identify the risks faced during the construction process, determine the risk type and specific level, and implement them according to the corresponding emergency plan specified previously.

[0020] Each of the above steps can form an assessment report file, and the report file is divided into paper and electronic files. The electronic file is uploaded to the cloud for backup storage. The assessment report file may include the use of text and model pictures to display the content of the assessment report, and transmit it to the display screen for image display to intuitively understand the construction safety situation. It also includes the need to convert the construction safety assessment results into a detailed safe construction plan during the construction period, and conduct irregular safety education and training for construction personnel and management. The construction safety risk assessment is carried out in accordance with the "Technical Standards for Construction Safety Risk Assessment of Building Construction and Municipal Infrastructure Projects", and the cofferdam design and construction are carried out in accordance with the "Design Specifications for Cofferdams of Water Conservancy and Hydropower Projects" to ensure the safety and stability of the cofferdam.

[0021] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise one" do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0022] In the present application, the directions or positional relationships indicated by the terms "upper", "lower", "inner", "middle", "outer", "front", "back", etc. are based on the directions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction.

[0023] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0024] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for safety assessment of canal engineering cofferdam construction, characterized in that: The following steps are involved: Step 1: Collect information and analyze the design. Collect the design documents, construction drawings and construction records of the cofferdam in the canal project, analyze the design and construction quality of the cofferdam, and identify possible safety hazards; Step 2: Site survey: Conduct site survey to observe the surrounding environment of the cofferdam and assess its impact on the safety of the cofferdam. At the same time, conduct real-time survey during the construction process. Step 3: Numerical simulation and evaluation: numerical simulation is carried out based on the data and actual survey results to simulate the mechanical and hydrodynamic loads on the cofferdam under different scenarios, and then the stability and safety of the cofferdam are evaluated based on the simulation results; Step 4: construct a water level prediction model, construct a water level prediction principal component analysis model, obtain water level prediction results, use a finite element model to simulate the impact of water level changes on the stability of the steel cofferdam foundation pit during the construction process, and obtain internal stress and displacement simulation numerical data; Step 5: Model analysis: Conduct sensitivity analysis on the finite element model to determine the key factors affecting the stability of the steel cofferdam foundation pit. Perform time-varying reliability analysis on the steel cofferdam foundation pit based on the water level prediction results, simulated numerical data and key factors to obtain the time-varying reliability analysis results. Step 6: Build a BIM simulation model, obtain BIM simulation monitoring data, and conduct a safety assessment on the steel cofferdam foundation pit in combination with the time-varying reliability analysis results; Step 7: Formulate risk control measures, including repairing and reinforcing the cofferdam structure, strengthening the monitoring and early warning system, etc., and timely discover and deal with potential problems through real-time monitoring and data analysis to ensure the smooth progress of the project; Step 8: On-site real-time intelligent safety monitoring: Based on the model and analysis, the site is monitored in real time. The monitoring content includes stress changes, deformation degree and on-site real-time video monitoring of the cofferdam structure. The data is transmitted to the cloud monitoring platform in real time through the wireless network for data analysis and processing, so as to timely discover potential problems and take measures; Step 9: Risk assessment. When risks arise, a detailed risk assessment is conducted in combination with the previous models, monitoring and analysis to identify the risks faced during the construction process and implement them according to the corresponding emergency plans previously specified.

2. A canal engineering cofferdam construction safety assessment method according to claim 1, characterized in that: The site survey in step 2 may specifically use geological radar, drilling equipment, underwater sonar and other equipment to conduct geological condition surveys to evaluate soil stability and groundwater level geological conditions; use hydrological monitoring equipment to conduct real-time monitoring of water level, flow rate and water quality; and use meteorological station equipment to collect temperature, rainfall and wind data.

3. A canal engineering cofferdam construction safety assessment method according to claim 2, characterized in that: The site survey in step 2 also includes using drones for terrain mapping and construction progress monitoring to quickly obtain high-precision terrain data of the construction site and conduct real-time surveys of the cofferdam construction process to ensure that the construction proceeds as planned.

4. A canal engineering cofferdam construction safety assessment method according to claim 1, characterized in that: The construction of the water level prediction model in step 4 specifically requires the collection of historical water level data, the extraction of characteristic vectors of factors affecting water level changes, the use of support vector machines for water level prediction, and the comprehensive consideration of complex hydrological scenarios and weather changes to perform medium- and short-term water level predictions.

5. A canal engineering cofferdam construction safety assessment method according to claim 1, characterized in that: The model analysis in step 5 specifically includes using finite element software to establish a three-dimensional model of the cofferdam, considering various loads such as soil pressure, hydrostatic pressure and water flow force, performing force analysis, and simulating the cofferdam structure at different construction stages to analyze its stability and deformation characteristics to ensure that the design meets safety requirements.

6. A canal engineering cofferdam construction safety assessment method according to claim 1, characterized in that: The construction of the BIM simulation model in step 6 also includes creating a BIM model of the cofferdam, adding uncertain factors related to the stability of the cofferdam, defining simulation scenarios, and obtaining stability response data of the foundation pit at different time points.

7. A canal engineering cofferdam construction safety assessment method according to claim 1, characterized in that: The risk control measures formulated in step 7 also include remote monitoring of the cofferdam construction process and timely issuing warnings when the system detects abnormal conditions. At the same time, it is also necessary to join the national geological disaster meteorological forecast and warning system to achieve an organic combination of geological disaster investigation and monitoring, forecast and warning, and emergency response, and improve the accuracy and practicality of geological disaster forecast and warning work.

8. A canal engineering cofferdam construction safety assessment method according to claim 1, characterized in that: Each of the steps described can form an assessment report file, and the report file is divided into paper and electronic files, and the electronic file is uploaded to the cloud for backup storage.

9. A canal engineering cofferdam construction safety assessment method according to claim 8, characterized in that: The assessment report file may include text and model images to display the content of the assessment report, and transmit it to a display screen for image display to intuitively understand the construction safety situation.

10. A canal engineering cofferdam construction safety assessment method according to claim 1, characterized in that: It also includes the need to convert the construction safety assessment results into detailed safety construction plans during the construction period, and to provide irregular safety education and training to construction personnel and management.

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