CN115900824B - Method for determining early warning value of monitoring system during dismantling of large-span overhanging steel structure - Google Patents
Method for determining early warning value of monitoring system during dismantling of large-span overhanging steel structure Download PDFInfo
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Abstract
A method for determining early warning value of a monitoring system when a large-span overhanging steel structure is dismantled comprises the following steps: the method comprises the following steps of; step one, monitoring the design of a system; establishing a model of the building structure to be dismantled by adopting finite element software: step three, carrying out simulation model calculation and structure vulnerability analysis in the dismantling process of the structure to be dismantled to obtain components and nodes with large stress or displacement or deflection; step four, selecting measuring point positions; arranging a monitoring system to monitor the structure to be dismantled; and step six, determining an early warning value. The method solves the technical problems that the adoption of the traditional method to select the early warning value can bring potential safety hazard and accident to the construction of the structure or cause the construction of the structure to be frequently interfered.
Description
Technical Field
The invention relates to the technical field of dismantling of large-span overhanging structures, in particular to a method for determining an early warning value of a monitoring system during dismantling of a large-span overhanging steel structure.
Background
The building structure of the project is an above-ground 39-layer, underground 5-layer steel structure and frame-inner cylinder structure system. The top of the building structure is provided with a large-span overhanging model; the cantilever modeling adopts a space truss system, 8 truss main trusses are arranged in the north-south direction, and 4 truss main trusses are arranged in the east-west direction. The purpose of this project is to demolish the large-span cantilever structure of roof north side promptly. When the span of the overhanging structure is too large, the construction danger coefficient is high, and in the dismantling construction process, the original structure 32-38 layers of steel columns and other main stress members can generate larger stress change, and the stress of the overhanging eight truss main truss can be greatly increased in the sliding process of the enclosure structure; therefore, in construction, a series of monitoring systems are required to monitor the safety of the structure from time to time. The early warning value selection of the monitoring system is directly related to the structural safety, and the full length of the early warning value of the traditional monitoring system is qualitatively selected according to construction experience at present; in this project, if the traditional method for selecting the early warning value is adopted, the following defects will occur: if the early warning value is selected to be too loose, potential safety hazards or accidents can be brought to the construction of the structure; if the early warning value is selected to be too tight, the construction of the structure is frequently disturbed.
Disclosure of Invention
The invention aims to provide an omnibearing water stopping structure of a hidden excavation station, which aims to solve the technical problems that the adoption of a traditional method to select an early warning value can bring potential safety hazards and accidents to the construction of the structure or cause the construction of the structure to be frequently interfered.
In order to achieve the above purpose, the present invention adopts the following technical scheme.
A method for determining an early warning value of a monitoring system when a large-span overhanging steel structure is dismantled is characterized by comprising the following steps of: the large-span overhanging steel structure comprises a longitudinal truss and a connecting truss; the longitudinal trusses are provided with a group of longitudinal trusses which are overhanging on the front side of the top of the building along the transverse interval, and the tail ends of the longitudinal trusses are fixedly connected with the steel structure of the top of the building; the overhanging length of the longitudinal truss is not less than 30m; the connecting trusses are provided with a plurality of groups, each group of connecting trusses are arranged between adjacent longitudinal trusses along the longitudinal interval, and the adjacent longitudinal trusses are fixedly connected.
The determination method includes the following steps.
Step one, monitoring the design of a system; the monitoring system comprises a monitoring device, a data acquisition device, a data transmission device, a data storage analysis system and an alarm device; the monitoring device is electrically connected with the data acquisition device, the data acquisition device is electrically connected with the data transmission device, the data transmission device is in signal connection with the data storage analysis system, and the data storage analysis system is in signal connection with the feedback device; transmitting the data acquired by the data acquisition device to the data storage device and the analysis device through the data transmission device; the data storage analysis system transmits the analyzed result to the alarm device, and the alarm device makes a corresponding reaction.
Modeling: and establishing a model of the building structure to be dismantled by adopting finite element software.
Step three, carrying out simulation model calculation and structure vulnerability analysis in the dismantling process of the structure to be dismantled to obtain components and nodes with large stress or displacement or deflection; the contents of the simulation model calculation include stress, displacement and deflection of the component.
Step four, selecting measuring point positions: according to the structural vulnerability analysis result, selecting a point with large stress or displacement or deflection as a measuring point; the point with large stress is the point which is more than or equal to 70% of the stress extreme value of the corresponding component; the point with large displacement is equal to or more than 70% of the displacement extreme value of the corresponding component; the point with large deflection is the point which is more than or equal to 70% of the deflection extreme value of the corresponding component.
Step five, arranging a monitoring system to monitor the structure to be dismantled: and arranging monitoring devices at the positions of the measuring points.
Step six, determining the early warning value, wherein the specific determining method is as follows.
And step 1, determining the maximum limit value of the monitoring component according to the design specification, wherein the maximum limit value comprises displacement, stress and deflection.
Step 2, obtaining the existing structure present value: the existing structure current value is obtained by adopting an existing structure monitoring or simulation calculation mode, and the existing structure current value comprises the existing structure displacement, stress and deflection.
And step 3, subtracting the existing structure value from the maximum limit value determined by adopting the design specification to be equal to the alarm allowable value.
Step 4, determining three-level early warning values: and respectively calculating the values of 60%, 80% and 95% of the alarm allowable values, namely the three-level early warning value.
Preferably, the monitoring device in the first step is a displacement sensor or a stress sensor meeting the requirements of site environment and monitoring precision; the data acquisition device and the data transmission device are integrated into a whole, so that automatic acquisition and transmission of data are realized; the data storage analysis system is an analysis system compiled according to the actual condition of the project, and the analysis system is placed in the cloud to realize the storage and analysis of the data.
Preferably, in the third step, when the simulation model calculation and the structure vulnerability analysis are performed, the stress on the structure to be removed comprises the self gravity of the structure to be removed and the force applied by the enclosure system to the structure to be removed in the removing process.
Preferably, in the fourth step, the method for selecting the measuring point position includes a qualitative selection method and a quantitative selection method; the qualitative selection method is characterized in that through analysis of structural characteristics, key components on a force transmission path are selected as measuring point positions; the quantitative selection method is to select points with large stress or displacement or deflection as measuring points according to structural simulation calculation results.
Preferably, the installation process of the monitoring device in the fifth step is as follows.
Step 1, treating the surface of a steel member at the measuring point position of the steel member according to the actual condition of the site, and removing fireproof paint on the surface of the steel member and influencing welding sundries in a chiseling mode; and (5) polishing the surface of the steel member by adopting sand paper or an angle grinder.
And 2, installing a monitoring device on the surface of the treated steel member in a welding mode.
And 3, after the installation is completed, initial data of the monitoring device are calibrated.
Step 4, integration of a monitoring system: the installed monitoring device is electrically connected with the data acquisition device, and is sequentially connected with the data transmission device, the data storage analysis system, the feedback device and the alarm device; the monitoring device is installed up to this point.
Preferably, the early warning value in the step six comprises a stress early warning value or a deflection early warning value or a displacement early warning value.
Preferably, the existing structure current value in the step six is selected in a priority order by monitoring the existing structure, and then adopting the current situation simulation calculation result.
Compared with the prior art, the invention has the following characteristics and beneficial effects.
1. The invention establishes an automatic monitoring platform conforming to construction enterprises by adopting various technologies such as wireless transmission, cloud storage and the like, and realizes the automation of 7×24 hours unattended sensitive parameter acquisition, transmission, storage, analysis and alarm, thereby realizing the effective control of the construction process. The unloading construction monitoring system is a 24-hour real-time online system, data are transmitted to a database in real time in a wired (or wireless) mode, and the database carries out safety structure assessment analysis on the data through a related system and realizes high-speed alarm and early warning. Structural treatment is carried out by the relevant units of the alarm early warning information, so that the potential safety hazards of the structure are reduced, and serious accidents such as collapse and the like are avoided.
2. The accuracy of the selection of the alarm value of the response is directly related to the use of the monitoring system and the impact on the overall construction. If the early warning value is selected too high, the moment that the measures find the risk problem is caused, and accidents are caused; if the selection early warning value is too low, frequent warning can exist, and the progress of construction is affected. Aiming at the problems, the invention provides a method for acquiring the current value of the related parameter of the existing structure by adopting the existing detection means or the simulation calculation result to meet the existing structural requirement; the method for calculating the alarm allowable value of the overhanging structure together with the structural limit value specified by the specification improves the accuracy of the alarm value, and realizes accurate control on the basis of meeting the functions of the structural health monitoring system, thereby realizing the effective control of the structural quality and safety in the construction process.
Drawings
The invention is described in further detail below with reference to the accompanying drawings.
Fig. 1 is a schematic structural view of a large-span overhanging steel structure in the present invention.
Reference numerals: 1-longitudinal truss, 2-connecting truss and 3-steel structure.
Detailed Description
As shown in FIG. 1, the method for determining the early warning value of the monitoring system when the large-span overhanging steel structure is dismantled comprises a longitudinal truss 1 and a connecting truss 2; the longitudinal trusses 1 are provided with a group of longitudinal trusses which are overhanging on the front side of the top of the building at intervals along the transverse direction, and the tail ends of the longitudinal trusses 1 are fixedly connected with a steel structure 3 on the top of the building; the overhanging length of the longitudinal truss 1 is not less than 30m; the connecting trusses 2 are provided with a plurality of groups, each group of connecting trusses 2 is arranged between adjacent longitudinal trusses 1 at intervals along the longitudinal direction, and the adjacent longitudinal trusses 1 are fixedly connected.
The determining method comprises the following steps:
Step one, monitoring the design of a system; the monitoring system comprises a monitoring device, a data acquisition device, a data transmission device, a data storage analysis system and an alarm device; the monitoring device is electrically connected with the data acquisition device, the data acquisition device is electrically connected with the data transmission device, the data transmission device is in signal connection with the data storage analysis system, and the data storage analysis system is in signal connection with the feedback device; transmitting the data acquired by the data acquisition device to the data storage device and the analysis device through the data transmission device; the data storage analysis system transmits the analyzed result to the alarm device, and the alarm device makes a corresponding reaction.
Modeling: and establishing a model of the building structure to be dismantled by adopting finite element software.
Step three, carrying out simulation model calculation and structure vulnerability analysis in the dismantling process of the structure to be dismantled to obtain components and nodes with large stress or displacement or deflection; the contents of the simulation model calculation include stress, displacement and deflection of the component.
Step four, selecting measuring point positions: according to the structural vulnerability analysis result, selecting a point with large stress or displacement or deflection as a measuring point; the point with large stress is the point which is more than or equal to 70% of the stress extreme value of the corresponding component; the point with large displacement is equal to or more than 70% of the displacement extreme value of the corresponding component; the point with large deflection is the point which is more than or equal to 70% of the deflection extreme value of the corresponding component.
Step five, arranging a monitoring system to monitor the structure to be dismantled: and arranging monitoring devices at the positions of the measuring points.
Step six, determining the early warning value, wherein the early warning value selection directly relates to the safety of the structure, and the structure pays importance to the safety; if the early warning value is selected to be too loose, potential safety hazards or accidents can be brought to the construction of the structure; if the early warning value is selected to be too tight, the construction of the structure is frequently disturbed. Therefore, this selection mode is to use a limit value (the maximum value specified by the specification of some parameters) minus the existing value (because the item is an existing structure, there is a method of confirming the existing value); the limit value can be found through the specification, and the existing value is confirmed through a monitoring mode or a simulation calculation mode: the specific determination method is as follows.
And step 1, determining the maximum limit value of the monitoring component according to the design specification, wherein the maximum limit value comprises displacement, stress and deflection.
Step 2, obtaining the existing structure present value: the existing structure current value is obtained by adopting an existing structure monitoring or simulation calculation mode, and the existing structure current value comprises the existing structure displacement, stress and deflection.
And step 3, subtracting the existing structure value from the maximum limit value determined by adopting the design specification to be equal to the alarm allowable value.
Step 4, determining three-level early warning values: and respectively calculating the values of 60%, 80% and 95% of the alarm allowable values, namely the three-level early warning value.
In the embodiment, the monitoring device in the first step is a displacement sensor or a stress sensor meeting the requirements of site environment and monitoring precision;
The data acquisition device and the data transmission device are integrated into a whole to realize automatic acquisition and transmission of data, and the scheme is that a data transmission unit DTU and an acquisition module of a wireless SIM card transmission mode are integrated into one acquisition instrument, so that the data can be directly transmitted to a cloud platform through 4g of the SIM card, the vibration wire type acquisition instrument and the fiber bragg grating acquisition instrument can be realized. The data transmission unit DTU (DATA TRANSFER unit) is a wireless terminal device which is specially used for converting serial data into IP data or converting the IP data into serial data to be transmitted through a wireless communication network; the data storage analysis system is analysis software compiled according to actual conditions of projects, the analysis software is placed in the cloud to realize data storage and analysis, and the analysis software consists of a database mysql, a message queue Rabbitmq, a message middleware mqtt, a time sequence database inflexDB, an operating system centOS, development language java, a framework springboot, large data stream processing flink and the like.
In the embodiment, in the third step, when the simulation model calculation and the structure vulnerability analysis are performed, the stress on the structure to be removed includes the self gravity of the structure to be removed and the force applied by the enclosure system to the structure to be removed in the removing process.
In the fourth embodiment, the method for selecting the position of the measuring point includes a qualitative selection method and a quantitative selection method; the qualitative selection method is characterized in that through analysis of structural characteristics, key components on a force transmission path are selected as measuring point positions; the force transmission path is that the plate at the top layer transmits the load to the beam and Liang Chuangei columns, the columns are transmitted to the foundation layer by layer, and the key components are the beam, the plate and the columns; the quantitative selection method is to select a point with a larger value of the related parameter as a measuring point position according to a structural simulation calculation result, wherein the point with the larger value of the related parameter is a point with stress or displacement or deflection being more than 70% of a corresponding extreme point.
In this embodiment, the installation process of the monitoring device in the fifth step is as follows:
step 1, treating the surface of a steel member at the measuring point position of the steel member according to the actual condition of the site, and removing fireproof paint on the surface of the steel member and influencing welding sundries in a chiseling mode; and (5) polishing the surface of the steel member by adopting sand paper or an angle grinder.
And 2, installing a monitoring device on the surface of the treated steel member in a welding mode.
And 3, after the installation is completed, initial data of the monitoring device are calibrated.
Step 4, integration of a monitoring system: the installed monitoring device is electrically connected with the data acquisition device, and is sequentially connected with the data transmission device, the data storage analysis system, the feedback device and the alarm device; the monitoring device is installed up to this point.
In this embodiment, the early warning value in the sixth step includes a stress early warning value or a deflection early warning value or a displacement early warning value.
In this embodiment, the priority order of selecting the current value of the existing structure in the step six is to monitor the existing structure preferentially, and then to use the current simulation calculation result.
In this embodiment, before the monitoring system is arranged in the fifth step, the following operations are further included:
1. the hardware is preferably as follows: according to the actual condition of the monitoring site, selecting proper hardware according to the requirements of the contents such as durability, service life, service environment requirement, transmission mode and the like of the hardware.
2. Software programming: the available software is compiled according to the functions actually required in the field, including but not limited to equipment management such as sensors, real-time data inquiry, duration data inquiry, security assessment result inquiry, alarm and early warning functions and the like
3. Hardware installation and system debugging: according to the monitoring scheme, the hardware is installed in a proper mode, and joint debugging is carried out together with software, so that the function of the structural health monitoring system is realized.
In this embodiment, the structural vulnerability analysis is to perform simulation calculation on the construction process of the structure through general finite element software, check the response of the structure under the working condition through the calculation result, that is, stress extremum and displacement extremum of each position, and consider that the limiting value of the material is certain, so that the observed stress extremum and displacement extremum are the positions with the greatest risk, that is, the points easy to damage.
The above embodiments are not exhaustive of the specific embodiments, and other embodiments are possible, and the above embodiments are intended to illustrate the present invention, not to limit the scope of the present invention, and all applications that come from simple variations of the present invention fall within the scope of the present invention.
Claims (7)
1. A method for determining an early warning value of a monitoring system when a large-span overhanging steel structure is dismantled is characterized by comprising the following steps of: the large-span overhanging steel structure comprises a longitudinal truss (1) and a connecting truss (2); the longitudinal trusses (1) are provided with a group of longitudinal trusses which are overhanging on the front side of the top of the building along the transverse interval, and the tail ends of the longitudinal trusses (1) are fixedly connected with a steel structure (3) on the top of the building; the overhanging length of the longitudinal truss (1) is not less than 30m; the connecting trusses (2) are provided with a plurality of groups, each group of connecting trusses (2) is longitudinally arranged between adjacent longitudinal trusses (1) at intervals, and the adjacent longitudinal trusses (1) are fixedly connected;
the determining method comprises the following steps:
Step one, monitoring the design of a system; the monitoring system comprises a monitoring device, a data acquisition device, a data transmission device, a data storage analysis system and an alarm device; the monitoring device is electrically connected with the data acquisition device, the data acquisition device is electrically connected with the data transmission device, the data transmission device is in signal connection with the data storage analysis system, and the data storage analysis system is in signal connection with the feedback device; transmitting the data acquired by the data acquisition device to the data storage device and the analysis device through the data transmission device; the data storage analysis system transmits the analyzed result to the alarm device, and the alarm device makes a corresponding reaction;
Modeling: establishing a model of the building structure to be dismantled by adopting finite element software;
step three, carrying out simulation model calculation and structure vulnerability analysis in the dismantling process of the structure to be dismantled to obtain components and nodes with large stress or displacement or deflection; the content calculated by the simulation model comprises stress, displacement and deflection of the component;
Step four, selecting measuring point positions: according to the structural vulnerability analysis result, selecting a point with large stress or displacement or deflection as a measuring point; the point with large stress is the point which is more than or equal to 70% of the stress extreme value of the corresponding component; the point with large displacement is equal to or more than 70% of the displacement extreme value of the corresponding component; the point with large deflection is the point which is more than or equal to 70% of the extreme value of the deflection of the corresponding component;
Step five, arranging a monitoring system to monitor the structure to be dismantled: arranging monitoring devices at the positions of the measuring points;
Step six, determining an early warning value, wherein the specific determining method comprises the following steps:
Step 1, determining a maximum limit value of a monitoring component according to design specifications, wherein the maximum limit value comprises displacement, stress and deflection;
Step 2, obtaining the existing structure present value: acquiring existing structure present values by adopting an existing structure monitoring or simulation calculation mode, wherein the existing structure present values comprise existing structure displacement, stress and deflection;
Step 3, subtracting the existing structure current value from the maximum limit value determined by adopting the design specification to be equal to the alarm allowable value;
step 4, determining three-level early warning values: and respectively calculating the values of 60%, 80% and 95% of the alarm allowable values, namely the three-level early warning value.
2. The method for determining the early warning value of the monitoring system when the large-span overhanging steel structure is dismantled is characterized in that: the monitoring device in the first step is a displacement sensor or a stress sensor meeting the requirements of site environment and monitoring precision; the data acquisition device and the data transmission device are integrated into a whole, so that automatic acquisition and transmission of data are realized; the data storage analysis system is an analysis system compiled according to the actual condition of the project, and the analysis system is placed in the cloud to realize the storage and analysis of the data.
3. The method for determining the early warning value of the monitoring system when the large-span overhanging steel structure is dismantled is characterized in that: and thirdly, when the simulation model calculation and the structure vulnerability analysis are carried out, the stress on the structure to be removed comprises the self gravity of the structure to be removed and the force applied by the enclosure system to the structure to be removed in the removing process.
4. The method for determining the early warning value of the monitoring system when the large-span overhanging steel structure is dismantled is characterized in that: in the fourth step, the method for selecting the measuring point position comprises a qualitative selecting method and a quantitative selecting method; the qualitative selection method is characterized in that through analysis of structural characteristics, key components on a force transmission path are selected as measuring point positions; the quantitative selection method is to select points with large stress or displacement or deflection as measuring points according to structural simulation calculation results.
5. The method for determining the early warning value of the monitoring system when the large-span overhanging steel structure is dismantled is characterized in that: the installation process of the monitoring device in the fifth step is as follows:
Step 1, treating the surface of a steel member at the measuring point position of the steel member according to the actual condition of the site, and removing fireproof paint on the surface of the steel member and influencing welding sundries in a chiseling mode; polishing the surface of the steel member to be smooth by adopting sand paper or an angle grinder;
Step 2, installing a monitoring device on the surface of the treated steel member in a welding mode;
Step 3, after the installation is completed, initial data of the monitoring device are adjusted;
Step 4, integration of a monitoring system: the installed monitoring device is electrically connected with the data acquisition device, and is sequentially connected with the data transmission device, the data storage analysis system, the feedback device and the alarm device; the monitoring device is installed up to this point.
6. The method for determining the early warning value of the monitoring system when the large-span overhanging steel structure is dismantled is characterized in that: the early warning value in the step six comprises a stress early warning value or a deflection early warning value or a displacement early warning value.
7. The method for determining the early warning value of the monitoring system when the large-span overhanging steel structure is dismantled is characterized in that: and step six, the existing structure current value is selected in priority order by adopting existing structure monitoring preferentially, and then the current situation simulation calculation result is adopted.
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| CN103309325A (en) * | 2013-06-07 | 2013-09-18 | 北京市建筑工程研究院有限责任公司 | Three-dimension-visualization dynamic monitoring system and monitoring method for prestressed steel structures |
| CN113776582A (en) * | 2021-08-25 | 2021-12-10 | 上海洪铺钢结构工程有限公司 | Steel structure bridge, safety monitoring method and safety monitoring device |
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| CN101469967A (en) * | 2007-12-27 | 2009-07-01 | 上海市建筑装饰工程有限公司 | Information-based monitoring early-warning method for building structure reconstruction |
| JP5382926B2 (en) * | 2009-06-03 | 2014-01-08 | 鹿島建設株式会社 | Jackdown dismantling method and system for multi-story buildings |
| CN111238427B (en) * | 2020-01-10 | 2021-04-27 | 山东建筑大学 | A real-time monitoring method for damage of tower crane tower body steel structure |
| CN217424355U (en) * | 2022-04-01 | 2022-09-13 | 深圳大学 | A steel structure monitoring system |
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| CN103309325A (en) * | 2013-06-07 | 2013-09-18 | 北京市建筑工程研究院有限责任公司 | Three-dimension-visualization dynamic monitoring system and monitoring method for prestressed steel structures |
| CN113776582A (en) * | 2021-08-25 | 2021-12-10 | 上海洪铺钢结构工程有限公司 | Steel structure bridge, safety monitoring method and safety monitoring device |
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