CN117575294A - Municipal works wisdom building site management system based on BIM technique - Google Patents

Municipal works wisdom building site management system based on BIM technique Download PDF

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CN117575294A
CN117575294A CN202410056512.3A CN202410056512A CN117575294A CN 117575294 A CN117575294 A CN 117575294A CN 202410056512 A CN202410056512 A CN 202410056512A CN 117575294 A CN117575294 A CN 117575294A
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CN117575294B (en
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闫岐
李芳平
程锋
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China Railway Beijing Engineering Group Co Ltd
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Abstract

The invention discloses a municipal engineering intelligent building site management system based on BIM technology, which relates to the technical field of building site management and comprises the following components: the intelligent building site management center, model and data management module, dispatch management module, progress management module, environment and energy management module and safety management module, wherein: the intelligent building site management center is responsible for managing signal transmission among other modules; the method comprises the steps of establishing a BIM model by the model and a data management module, determining a plurality of engineering blocks, establishing a plurality of databases and placing a plurality of groups of sensors; the dispatching management module makes a construction and work and rest plan and manages dispatching of workers, equipment and raw materials; the progress management module judges whether the progress is delayed or not; the environment and energy management module monitors the environment index and the use and emission conditions of energy; the management efficiency is improved, the resource utilization is optimized, and the construction safety is ensured.

Description

Municipal works wisdom building site management system based on BIM technique
Technical Field
The invention relates to the technical field of building site management, in particular to a municipal engineering intelligent building site management system based on a BIM technology.
Background
BIM (building information model) is a digital tool, which is based on a three-dimensional model and integrates various information of building engineering. BIM technology provides an advanced technical means for engineering management, constructs a construction site intelligent monitoring and control system, and effectively overcomes the defects of the traditional method and technology in supervision. And by combining front-end data support, project global management and control are realized, a scene intelligent algorithm is used as a drive, passive supervision is changed into active supervision, the control level of construction quality, safety, cost and progress is improved, waste is reduced, and engineering project success is ensured.
In smart worksite management, BIM technology may play an important role. First, the BIM model can accurately simulate the building and construction process, helping management personnel to better understand the construction environment and process. And secondly, the BIM technology can be combined with the Internet of things technology, site data are acquired through the sensor and analyzed, real-time monitoring and early warning of the site are realized, and construction safety and efficiency are improved. In addition, BIM technology can also realize data sharing and collaborative work, and promote communication and collaboration of all parties.
Traditional site management generally relies on manual monitoring and scheduling, and lacks an efficient information processing and sharing mechanism, so that management efficiency is low; traditional site management lacks comprehensive acquisition and analysis of data, and cannot accurately grasp information in aspects of construction progress, cost, quality, safety and the like; various safety risks exist in the municipal engineering construction process, such as personnel safety, equipment safety, environmental safety and the like, and the conventional site management is difficult to comprehensively control the risks; in the municipal engineering construction process, a plurality of aspects need to be monitored, such as engineering progress, construction quality, material use and the like, and the traditional site management is often difficult to realize comprehensive monitoring; traditional worksite management often lacks effective environmental protection measures.
Disclosure of Invention
Aiming at the technical problems in the background technology, the invention provides a municipal engineering intelligent building site management system based on BIM technology, which comprises: the intelligent building site management center is responsible for managing the other modules and signal transmission among the modules; the method comprises the steps of establishing a BIM model by the model and a data management module, determining a plurality of engineering blocks, establishing a plurality of databases and placing a plurality of groups of sensors; the dispatching management module makes a construction and work and rest plan and manages dispatching of workers, equipment and raw materials; the progress management module judges whether the progress is delayed or not; the environment and energy management module monitors the environment index and the use and emission conditions of energy; the safety management module carries out safety management on the municipal engineering intelligent construction site from two aspects of personnel safety and building safety.
In order to achieve the above purpose, the invention is realized by the following technical scheme:
municipal works wisdom building site management system based on BIM technique includes: the intelligent building site management center, model and data management module, dispatch management module, progress management module, environment and energy management module and safety management module, wherein:
The intelligent building site management center is responsible for managing the model and the data management module, the scheduling management module, the progress management module, the environment and energy management module and the safety management module and transmitting signals among the modules;
the model and data management module comprises a BIM model building unit, an engineering block management unit, a database storage unit and a sensor setting unit; building a BIM model according to municipal engineering related data, and determining different engineering blocks according to the model; building databases of construction workers, construction raw materials, construction equipment and daily BIM models; placing a plurality of groups of sensors on a construction site for detecting construction related information;
the dispatching management module comprises a total construction plan determining unit, a daily construction plan determining unit, a work and rest management unit, a construction worker management unit, a construction equipment management unit and a construction raw material management unit; making a total construction plan and a daily construction plan, carrying out scheduling management on construction workers, construction raw materials and construction equipment according to the engineering quantity of each engineering block, and monitoring the working condition of the construction workers, the in-out condition of the construction raw materials and the operation condition of the construction equipment in real time;
the progress management module comprises a daily progress management unit, a progress delay early warning unit and a delay reason analysis unit; judging whether the daily actual construction progress reaches the specified construction progress, if not, sending delay early warning and providing a solution;
The environment and energy management module comprises a sensor placement unit, a noise monitoring unit, a smoke monitoring unit, a temperature monitoring unit, an environment alarm unit, a water spray control unit and an energy use and emission analysis unit; monitoring various indexes in the construction environment in real time, sending out an alarm and taking corresponding measures when the indexes exceed corresponding thresholds; simulating energy use and emission conditions of the building by using the BIM model and real-time environment data, and judging whether optimization is needed;
the safety management module comprises a structure detection unit, a dangerous area detection unit, a personnel identity recognition unit, a safety equipment detection unit, a personnel position detection unit and a voice alarm unit, wherein the structure detection unit comprises a size measurement unit, a stress analysis unit and an earthquake simulation unit; safety management is carried out on the municipal engineering intelligent construction site from two aspects of personnel safety and building safety.
Specifically, the BIM model building unit is responsible for collecting data related to municipal engineering projects, building geometric shapes, component attributes and relations of the models according to design files and construction drawings by using BIM software based on the collected data, and setting coordinates and reference points of the models;
The engineering block management unit divides the BIM model into a plurality of engineering blocks according to the BIM model and related construction logic, wherein the engineering blocks comprise building structure engineering blocks, building decoration engineering blocks, electromechanical engineering blocks, traffic engineering blocks, heating and ventilation engineering blocks, water supply and drainage engineering blocks and landscape engineering blocks;
the database storage unit is responsible for creating databases of construction workers, construction raw materials, construction equipment and daily BIM models; the construction worker database stores related information of each construction worker, including names, photos, ages, work ages, allocated working time and responsible engineering block information; the building raw material database stores the related information of all raw materials used in construction, including raw material names, consumption, stock, engineering blocks used and unit cost information; the construction equipment database can store relevant information of equipment used in construction, including equipment names, equipment use time, equipment maintenance conditions, engineering blocks used by the equipment and equipment user data; the daily BIM model database stores the BIM model updated every day, namely, after the construction is finished every day, the completed construction part is marked in the BIM model, and the marked BIM model is stored in the daily BIM model database;
The sensor setting unit is responsible for placing a plurality of groups of internet of things equipment on a construction site for collecting real-time data of the construction site, and comprises a monitoring camera, a displacement sensor, a noise monitor, a smoke sensor and a temperature sensor.
Specifically, the total construction plan determining unit calculates the total engineering quantity of municipal engineering according to the BIM model, wherein the total engineering quantity is represented by the sum of the volumes of all engineering blocks in the BIM; the method comprises the steps of making a total construction plan according to total engineering quantity, preset delivery time and construction difficulty, and specifically comprises the estimated engineering quantity and expected construction days of each engineering block, the total number of allocated construction workers, the total number of expected material use and the total number of equipment requirements;
the daily construction plan determining unit is used for making a next-day work task for a construction worker after the construction task of each day is finished, and particularly, the daily expected workload is obtained according to the estimated engineering quantity and the expected construction days of each engineering blockWherein->Indicate->Each engineering blockThe expected daily workload is the same;
the work and rest management unit is responsible for making construction work and rest of construction workers and can be adjusted in real time according to environmental factors.
Specifically, the construction worker management unit tracks and manages construction workers on a construction site through a BIM model and an RFID technology, and specifically, each worker is provided with an RFID tag, and when the construction workers enter the construction site, the information of the construction workers is automatically recorded and updated into the BIM model; the system can display the information of the number of people, the position and the working state of the construction site in real time; when a construction worker leaves a construction site, recovering the RFID tag, and storing the time of the construction worker at the time in a construction worker database;
The construction equipment management unit monitors and manages mechanical equipment on a construction site by utilizing a BIM model and a sensor technology, specifically, after the construction equipment is identified by a monitoring camera, the running state and the service condition information of the equipment are obtained, and data are integrated into a BIM model and a construction equipment database; the system can display the distribution, running state and load information of the equipment in real time;
the building raw material management unit tracks and manages materials of a construction site through a BIM model and an RFID technology, and particularly, each material is provided with an RFID label, and when the material enters the construction site, the information of the material is automatically recorded and updated into the BIM model; the system can display the material stock, the use condition and the distribution information of the construction site in real time.
Further, after the daily construction is finished, the daily progress management unit updates the BIM model according to the actual construction quantity, namely, the completed construction part is marked in the BIM model, the BIM model of the last day is taken out from a daily BIM model database, and the difference of the volumes of marked areas in the two BIM models is taken as the actual construction workload; to actually construct the work loadCompared with the expected construction workload set on the same day +. >Wherein->Is a positive integer greater than 1, if +.>Then it is indicated that the present construction workload is up to standard, and the construction workload which is finished in excess is recorded +.>And adding the current overcomplete construction workload and the previous overcomplete construction workload to obtain the new construction workload sum +.>The method comprises the steps of carrying out a first treatment on the surface of the If it isThen the present construction workload is not up to standard, and the incomplete construction workload is recorded>Sum of construction workload completed in excess before +.>Construction effort not completed to date>In comparison, if->The workload which is finished excessively before can be counteracted with the presently unfinished construction workload, namely, the subsequent engineering workload distribution is not required to be adjusted, and the difference value between the sum of the workload which is finished excessively and the presently unfinished construction workload is taken as the new sum of the workload which is finished excessively>The method comprises the steps of carrying out a first treatment on the surface of the If->Indicating previous overcompleteThe workload is insufficient to offset the today's incomplete construction workload, and the progress delay early warning unit sends delay early warning to the construction group leader.
Further, after the daily schedule management unit determines that the workload that is finished excessively before is insufficient to offset the workload of the construction that is not finished so far, the following solution is provided:
Taking the difference between the currently unfinished construction workload and the sum of the excessive finished workload as the new currently unfinished construction workloadUnfinished workload->Pre-assigned to the work task of the following day, the average workload of each construction worker of the following day is calculated>The method specifically comprises the following steps:
wherein the method comprises the steps ofRepresenting the total number of construction workers;
the calculated average workload is compared with the maximum workload which can be born by the construction workersIn comparison, the maximum amount of work that the construction worker can withstand +.>The average working age and age of the construction workers are related to the weather condition of the following day;
if it isThen the expected workload is pre-distributed to the work tasks of the following day, and the workload does not exceed the maximum bearable by the construction workersThe large workload is pre-allocated to the work tasks of the following day, wherein the expected workload is not reached;
if it isIf the expected workload is not pre-distributed to the work task of the next day, the workload of the next day is too large to exceed the maximum workload which can be born by the construction workers, and the judgment is needed that if the expected workload is not pre-distributed to the next day>In the daily work task, whether the construction worker can bear the updated workload is specifically as follows:
Wherein,the expected construction residual days of the engineering block cannot be exceeded;
if presentSo that->Then it means pre-assigning the workload which did not reach the expected one to the back +.>In daily work tasks, the maximum workload which can be born by construction workers is not exceeded, and the workload which does not reach the expected workload is pre-distributed to the post->In the daily work task;
if not presentSo that->And the method indicates that the residual daily workload exceeds the maximum workload which can be born by the construction workers in the expected construction days, and sends out overtime construction instructions.
Further, after the construction delay is judged, the delay reason analysis unit analyzes the reason of the delay and sends the result to the related manager, specifically: judging whether the construction workers have false work according to the working time data of the construction workers; judging whether the construction delay is related to the small number of construction equipment or faults according to the service time of the construction equipment and the maintenance record; judging whether the building raw materials are in insufficient stock or not according to the in-out data of the building raw materials; the relevant data are obtained from the corresponding database.
Specifically, the sensor placement unit marks a daily construction area in the BIM model, analyzes a source area generated by noise and smoke, and selects a corresponding sensor placement position;
The noise monitoring unit monitors noise generated during construction by using a noise monitor, when detecting that the noise level measured by a certain noise monitor exceeds a set threshold value, the noise monitoring unit locates an area where the noise monitor is located in the BIM model, and the environment alarm unit sends out an excessive noise alarm to the area where the noise monitor is located;
the smoke monitoring unit monitors the concentration of smoke generated during construction by using a smoke sensor, and when detecting that the concentration level of the smoke detected by a certain smoke sensor exceeds a set threshold value, the smoke monitoring unit locates an area where the smoke sensor is located in the BIM model, and the water spraying control unit controls a water sprayer in the area where the smoke sensor is located to start to operate;
the temperature monitoring unit monitors temperature change in a construction area by using a temperature sensor, and when detecting that the temperature of a certain area is higher than the upper limit of a set threshold range or lower than the lower limit of the set threshold range, the temperature monitoring unit informs a work and rest management unit in the dispatching management module to adjust construction work and rest of construction workers;
the energy use and emission analysis unit is responsible for simulating the energy use and emission conditions of the building by using the BIM model and real-time environment data, and specifically importing the BIM model into the selected energy simulation software; setting simulation parameters according to actual construction conditions and environmental data, wherein the parameters comprise design parameters of a building, performance parameters of building equipment, parameters of building raw materials and environmental conditions, and the environmental parameters represent parameters measured by a sensor; after the simulation program is operated, simulation results are obtained, wherein the simulation results comprise energy consumption and emission of the building in different time periods; analyzing the result, and if the consumption and the emission of the energy source are in a normal range, optimizing is not needed; if the consumption and the emission of the energy are not in the normal range, the environment alarm unit gives an abnormal alarm of the energy to the manager and provides an optimization scheme, wherein the optimization scheme comprises the replacement of high-energy-efficiency equipment and the improvement of the architectural design.
Specifically, the structure detection unit is used for detecting the structure problem of the completed construction part in the BIM;
the dangerous area detection unit is used for detecting dangerous areas in the construction completed part in the BIM model, extracting the construction completed part marked in the BIM model and carrying out floor detection, specifically detecting the state around each floor plate in the model, and marking the areas around which blank exists as dangerous areas, wherein the blank areas comprise unconnected floors, uneven floor edges and floors under the lack of support;
when constructors enter a construction site, the personnel identity recognition unit recognizes identity information of the entering personnel through an image recognition technology, compares the recognized facial features with pictures of construction workers in a construction worker database, judges whether the workers are authorized personnel, and only the authorized personnel can enter a key area to ensure construction safety; if the voice alarm unit judges that the voice alarm unit is not an authorized person, the voice alarm unit can send out a voice alarm of 'unauthorized person entering';
the safety equipment detection unit is used for detecting whether a construction worker wears the safety helmet correctly or not in a construction scene, and if the construction worker is identified that the safety helmet is not worn correctly, the voice alarm unit can send out a voice alarm of 'please wear the safety helmet correctly';
The personnel position detection unit is responsible for detecting whether constructors approach a dangerous area or not, detecting the position information of construction workers in real time based on the RFID technology, and if a certain construction worker is found to approach the dangerous area, the voice alarm unit sends a 'approach the dangerous area', please pay attention to-! "voice alert.
Further, the structure detecting unit includes, when applied:
using a measuring tool to measure the size of the completed construction part in the BIM model; selecting components to be measured, including walls, columns and beams, and measuring by a dimension measuring unit; the measurement result is used for checking whether the construction meets the design requirement;
carrying out stress analysis on the support column to judge whether the stress is uniform; firstly, establishing a model of a support column in a BIM model, and adding corresponding constraint conditions; then the stress analysis unit utilizes a structural analysis tool to carry out stress analysis on the support column, so as to obtain stress distribution and deformation conditions of the support column; judging whether the stress of the support column is uniform and whether reinforcement or adjustment is needed or not according to the results;
the earthquake simulation unit performs earthquake simulation on the completed construction part by using an earthquake simulation tool; setting earthquake parameters such as earthquake grades and earthquake focus positions, and then performing earthquake simulation calculation; and (3) evaluating the seismic performance of the completed construction part, such as the deformation condition and the stress distribution condition of the structure, through a simulation result, so as to judge whether the seismic performance meets the seismic safety requirement.
The invention provides a municipal engineering intelligent building site management system based on BIM technology, which has the following beneficial effects:
1. the model and data management module integrates and shares various data and information of municipal engineering projects by establishing a BIM model and a related database; engineering block division based on BIM model can coordinate construction progress better, and resource waste and construction conflict are avoided effectively; the real-time condition of the construction site can be monitored through various sensors arranged by the sensor setting unit, and potential safety hazards or abnormal conditions possibly existing in the construction site can be found in time; information such as construction process, resources, environment and the like can be mastered more intuitively and accurately;
2. the dispatching management module can dispatch and manage the construction workers, the construction raw materials and the construction equipment according to the engineering quantity of each engineering block, and monitor the working condition of the construction workers, the in-out condition of the construction raw materials and the operation condition of the construction equipment in real time. This helps to optimize resource allocation, improving construction efficiency and quality;
3. by updating the BIM model after daily construction is finished, calculating the actual construction workload and comparing the actual construction workload with the expected construction workload, the construction progress can be accurately monitored, the progress deviation can be timely found, and corresponding adjustment measures can be adopted; when the actual construction workload does not reach the expected construction workload, the system can send out progress delay early warning according to the comparison of the excessive completed workload and the incomplete workload, and prompt corresponding solutions, so that the problems can be found and solved in time;
4. By comparing with the working capacity and the working load of the construction workers, the system can help to avoid excessive workload being distributed to the construction workers, avoid the overlarge working load and reasonably optimize the distribution of construction tasks;
5. the environment and energy management module can monitor various indexes in the construction environment in real time, such as noise, smoke, temperature and the like, and when the indexes exceed corresponding thresholds, an alarm is given out and corresponding measures are taken. In addition, the BIM model and the real-time environment data are utilized to simulate the energy use and emission conditions of the building, and whether the optimization is needed or not is judged, so that the influence of construction on the surrounding environment and residents and the abnormal consumption condition of the energy during construction are reduced;
6. the safety management module carries out comprehensive safety management and risk control on the municipal engineering intelligent construction site from two aspects of personnel and building safety through the functions of structure detection, dangerous area detection, personnel identification and the like, and provides measures and alarms for guaranteeing construction safety.
Drawings
FIG. 1 is a schematic diagram of a system for managing municipal engineering intelligent construction sites based on BIM technology.
In the figure: 1. an intelligent building site management center; 2. a dispatch management module; 21. a BIM model building unit; 22. an engineering block management unit; 23. a database storage unit; 24. a sensor setting unit; 3. a dispatch management module; 31. a total construction plan determining unit; 32. a daily construction plan determining unit; 33. a work and rest management unit; 34. a construction worker management unit; 35. a construction equipment management unit; 36. a building raw material management unit; 4. a progress management module; 41. a daily schedule management unit; 42. progress delay early warning unit; 43. a delay cause analysis unit; 5. an environment and energy management module; 51. a sensor placement unit; 52. a noise monitoring unit; 53. a smoke monitoring unit; 54. a temperature monitoring unit; 55. an environment alarm unit; 56. a water spray control unit; 57. an energy use and emission analysis unit; 6. a security management module; 61. a structure detection unit; 611. a size measurement unit; 612. a stress analysis unit; 613. a seismic simulation unit; 62. a dangerous area detection unit; 63. a personnel identity recognition unit; 64. a safety equipment detection unit; 65. a personnel position detection unit; 66. and a voice alarm unit.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, the invention provides a municipal engineering intelligent building site management system based on a BIM technology, which comprises the following modules:
the intelligent building site management center 1 is responsible for signal transmission among the management model and data management module 2, the scheduling management module 3, the progress management module 4, the environment and energy management module 5, the safety management module 6 and the modules;
the model and data management module 2 includes a BIM model building unit 21, an engineering block management unit 22, a database storage unit 23, and a sensor setting unit 24; building a BIM model according to municipal engineering related data, and determining different engineering blocks according to the model; building databases of construction workers, construction raw materials, construction equipment and daily BIM models; placing a plurality of groups of sensors on a construction site for detecting construction related information;
The BIM model building unit 21 is responsible for collecting data related to municipal engineering projects, including information such as design files, construction drawings and the like; based on the collected data, a BIM model is created by using related BIM software, specifically, the geometric shape, the component attribute and the relation of the model are built according to the design file and the construction drawing, and the coordinates and the datum points of the model are set.
The engineering block management unit 22 divides the BIM model into a plurality of engineering blocks, such as a building structure engineering block, a building decoration engineering block, an electromechanical engineering block, a traffic engineering block, a heating and ventilation engineering block, a water supply and drainage engineering block, and a landscape engineering block, according to the BIM model and the related construction logic; wherein the building construction block comprises a main structural part of a building, such as a beam, a column, a floor slab, etc.; the building decoration engineering block comprises indoor and outdoor decoration and finishing parts of a building, such as wall surfaces, ceilings, floors, doors and windows and the like; the electromechanical engineering block comprises electromechanical equipment and systems in the building, such as electricity, water supply and drainage, heating ventilation and air conditioning and the like; traffic engineering blocks include related traffic facilities and traffic systems, such as roads, bridges, tunnels, utility tunnels, etc.; the heating and ventilation engineering blocks are focused on heating, ventilation, air conditioning and other systems of the building; the water supply and drainage engineering block relates to a water supply and drainage system of a building, and comprises a water supply pipeline, a drainage pipeline, a water pump, a valve and the like; the garden landscape engineering block is related to greening landscape around the building and environmental configuration, and comprises flower beds, lawns, trees, lamplight and the like. The construction sequence of the municipal engineering intelligent construction site is as follows from first to last: building structure engineering block, electromechanical engineering block, building decoration engineering block, traffic engineering block, heating and ventilation engineering block, water supply and drainage engineering block and landscape engineering block.
The storage unit 23 is responsible for creating a database of construction workers, construction raw materials, construction equipment and daily BIM models. The construction worker database stores related information of each construction worker, including names, photos, ages, work ages, allocated working time and responsible engineering block information; the building raw material database stores the related information of all raw materials used in construction, including raw material names, consumption, stock, engineering blocks used and unit cost information; the construction equipment database can store relevant information of equipment used in construction, including equipment names, equipment use time, equipment maintenance conditions, engineering blocks used by the equipment and equipment user data; the daily BIM model database stores the BIM model updated every day, namely, after the construction is finished every day, the completed construction part is marked in the BIM model, and the marked BIM model is stored in the daily BIM model database; wherein, the construction workers, the construction raw materials and partial data in the construction equipment database can be changed in real time according to actual conditions.
The sensor setting unit 24 is responsible for placing a plurality of groups of internet of things equipment at a construction site for collecting real-time data of the construction site, such as a monitoring camera, a displacement sensor, a noise monitor, a smoke sensor and a temperature sensor; the monitoring camera is used for monitoring the warehouse-in and warehouse-out condition of materials, the running state and running time of equipment, the construction progress and the construction danger; the displacement sensor is used for monitoring displacement changes in construction processes such as earth excavation, filling and the like; the noise monitor and the gas sensor are used for monitoring noise generated during construction; the smoke sensor is used for monitoring the concentration of smoke generated during construction; the temperature sensor is used for monitoring temperature change during construction.
The dispatch management module 3 includes a total construction plan determination unit 31, a daily construction plan determination unit 32, a work and rest management unit 33, a construction worker management unit 34, a construction equipment management unit 35, and a construction raw material management unit 36; scheduling and managing construction workers, construction raw materials and construction equipment according to the engineering quantity of each engineering block, and monitoring the working condition of the construction workers, the in-out condition of the construction raw materials and the operation condition of the construction equipment in real time;
the total construction plan determining unit 31 calculates the total engineering quantity of municipal works based on the BIM model, the total engineering quantity being expressed by the sum of the volumes of all the engineering blocks in the BIMThe method comprises the steps of carrying out a first treatment on the surface of the The method comprises the steps of making a total construction plan according to total engineering quantity, preset delivery time and construction difficulty, and specifically comprises the estimated engineering quantity and expected construction days of each engineering block, the total number of allocated construction workers, the total number of expected material use and the total number of equipment requirements; the daily construction plan determining unit 32 makes work tasks for the construction workers of the next day after the construction tasks of each day are completed, specifically, obtains expected workload of each day according to the estimated project amount and the expected construction days of each project blockWherein->Indicate- >The expected workload of each engineering block is the same every day; the work and rest management unit 33 is responsible for making construction work and rest of construction workers and can be adjusted in real time according to environmental factors;
the construction worker management unit 34 tracks and manages construction workers at a construction site through a BIM model and an RFID technology, specifically, equips each worker with an RFID tag, and when the construction workers enter the construction site, information thereof is automatically recorded and updated into the BIM model; the system can display the information of the number of people, the position and the working state of the construction site in real time, so that management personnel can conveniently schedule the personnel and monitor the safety; when a construction worker leaves a construction site, recovering the RFID tag, and storing the time of the construction worker at the time in a construction worker database;
the construction equipment management unit 35 monitors and manages the mechanical equipment on the construction site by utilizing the BIM model and the sensor technology, specifically, after identifying the construction equipment by a monitoring camera, obtains the running state and the service condition information of the equipment, and integrates the data into a BIM model and a construction equipment database; the system can display the distribution, running state and load information of the equipment in real time, and help management personnel to schedule and maintain the equipment;
The building raw material management unit 36 tracks and manages materials of a construction site through a BIM model and an RFID technology, specifically, provides each material with an RFID tag, and when the material enters the construction site, information thereof is automatically recorded and updated into the BIM model; the system can display the material stock, the service condition and the distribution information of the construction site in real time, and is convenient for management personnel to carry out material scheduling, allowance monitoring and cost control.
The schedule management module 4 includes a daily schedule management unit 41, a schedule delay early warning unit 42, and a delay cause analysis unit 43; judging whether the daily actual construction progress reaches the specified construction progress, if not, sending delay early warning and providing a solution;
after the daily construction is finished, the daily progress management unit 41 updates the BIM model according to the actual construction amount, namely, the completed construction part is marked in the BIM model, and the BIM model of the last day is taken out from a daily BIM model database, and the difference of the marked area volumes in the two BIM models is taken as the actual construction workload; to actually construct the work loadCompared with the expected construction workload set on the same day +.>Wherein->Is a positive integer greater than 1, if +. >Then it is indicated that the present construction workload is up to standard, and the construction workload which is finished in excess is recorded +.>And adding the current overcomplete construction workload and the previous overcomplete construction workload to obtain the new construction workload sum +.>The method comprises the steps of carrying out a first treatment on the surface of the If->Then the present construction workload is not up to standard, and the incomplete construction workload is recorded>Sum of construction workload completed in excess before +.>Construction effort not completed to date>In comparison, if->The workload which is finished excessively before can be counteracted with the presently unfinished construction workload, namely, the subsequent engineering workload distribution is not required to be adjusted, and the difference value between the sum of the workload which is finished excessively and the presently unfinished construction workload is taken as the new sum of the workload which is finished excessively>The method comprises the steps of carrying out a first treatment on the surface of the If->The progress delay early-warning unit 42 sends delay early warning to the construction team leader, and provides a solution as follows:
taking the difference between the currently unfinished construction workload and the sum of the excessive finished workload as the new currently unfinished construction workloadUnfinished workload- >Pre-assigned to the work task of the following day, the average workload of each construction worker of the following day is calculated>Specifically, it is:
Wherein the method comprises the steps ofRepresenting the total number of construction workers;
the calculated average workload is compared with the maximum workload which can be born by the construction workersIn comparison, the maximum amount of work that the construction worker can withstand +.>The average working age and age of the construction workers are related to the weather condition of the following day;
if it isThe method comprises the steps of pre-distributing the work load which does not reach the expected work load to the work task of the following day, wherein the work load does not exceed the maximum work load which can be born by construction workers, and pre-distributing the work load which does not reach the expected work load to the work task of the following day;
if it isIf the expected workload is not pre-distributed to the work task of the next day, the workload of the next day is too large to exceed the maximum workload which can be born by the construction workers, and the judgment is needed that if the expected workload is not pre-distributed to the next day>In the daily work task, whether the construction worker can bear the updated workload is specifically as follows:
wherein,the expected construction residual days of the engineering block cannot be exceeded;
if presentSo that->Then it means pre-assigning the workload which did not reach the expected one to the back +. >In daily work tasks, the maximum workload which can be born by construction workers is not exceeded, and the workload which does not reach the expected workload is pre-distributed to the post->In the daily work task;
if not presentSo that->And the method indicates that the residual daily workload exceeds the maximum workload which can be born by the construction workers in the expected construction days, and sends out overtime construction instructions.
In addition, after judging that the construction is delayed, the delay cause analysis unit 43 analyzes the cause of the delay and sends the result to the relevant manager to reduce the possibility that the delay situation occurs again, specifically: judging whether the construction workers have false work according to the working time data of the construction workers; judging whether the construction delay is related to the small number of construction equipment or faults according to the service time of the construction equipment and the maintenance record; judging whether the building raw materials are in insufficient stock or not according to the in-out data of the building raw materials; the relevant data are obtained from the corresponding database.
The environment and energy management module 5 includes a sensor placement unit 51, a noise monitoring unit 52, a smoke monitoring unit 53, a temperature monitoring unit 54, an environment alarm unit 55, a water spray control unit 56, and an energy use and emission analysis unit 57; monitoring various indexes in the construction environment in real time, sending out an alarm and taking corresponding measures when the indexes exceed corresponding thresholds; simulating energy use and emission conditions of the building by using the BIM model and real-time environment data, and judging whether optimization is needed;
The sensor placement unit 51 marks a daily construction area in the BIM model, analyzes a source area generated by noise and smoke, and selects a corresponding sensor placement position;
the noise monitoring unit 52 monitors noise generated during construction by using a noise monitor, and when detecting that the noise level measured by a certain noise monitor exceeds a set threshold, locates an area where the noise monitor is located in the BIM model, and the environment alarm unit 55 sends out an excessive noise alarm to the area where the noise monitor is located;
the smoke monitoring unit 53 monitors the concentration of smoke generated during construction by using a smoke sensor, and when detecting that the concentration level of smoke measured by a certain smoke sensor exceeds a set threshold value, the smoke monitoring unit locates an area where the smoke sensor is located in the BIM model, and the water spraying control unit 56 controls the water sprayer in the area where the smoke sensor is located to start to operate;
the temperature monitoring unit 54 monitors a temperature change in the construction area using a temperature sensor, and when detecting that the temperature of a certain area is higher than the upper limit of the set threshold range or lower than the lower limit of the set threshold range, notifies the work and rest management unit 33 in the schedule management module 3 to adjust the construction work and rest of the construction worker;
The energy usage and emission analysis unit 57 is responsible for simulating the energy usage and emission of the building using the BIM model and the real-time environmental data, specifically importing the BIM model into the selected energy simulation software; setting simulation parameters according to actual construction conditions and environmental data, wherein the parameters comprise design parameters of a building, performance parameters of building equipment, parameters of building raw materials and environmental conditions, and the environmental parameters represent parameters measured by a sensor; after the simulation program is operated, simulation results are obtained, wherein the simulation results comprise energy consumption and emission of the building in different time periods; analyzing the result, and if the consumption and the emission of the energy source are in a normal range, optimizing is not needed; if the consumption amount and the discharge amount of the energy are not all within the normal range, the environment warning unit 55 gives an abnormal warning of the energy to the manager and proposes an optimization scheme including replacement of energy efficient equipment, improvement of the architectural design, and the like.
The safety management module 6 includes a structure detection unit 61, a dangerous area detection unit 62, a person identification unit 63, a safety equipment detection unit 64, a person position detection unit 65, and a voice alarm unit 66, wherein the structure detection unit 61 includes a size measurement unit 611, a stress analysis unit 612, and a seismic simulation unit 613; safety management is carried out on the municipal engineering intelligent construction site from two aspects of personnel safety and building safety;
The structure detecting unit 61 is configured to detect a structural problem of a completed construction portion in the BIM model, specifically:
1. size measurement: using a measuring tool to measure the size of the completed construction part in the BIM model; by selecting a member to be measured, such as a wall, a column, a beam, or the like, and then measuring by the dimension measuring unit 611; the measurement result is used for checking whether the construction meets the design requirement;
2. carrying out stress analysis on the support column to judge whether the stress is uniform; firstly, establishing a model of a support column in a BIM model, and adding corresponding constraint conditions; then the stress analysis unit 612 performs stress analysis on the support columns by using a structure analysis tool to obtain the stress distribution, deformation condition and other results of the support columns; through the results, whether the stress of the support column is uniform and whether reinforcement or adjustment is needed can be judged;
3. the earthquake simulation unit 613 performs earthquake simulation on the completed construction section using an earthquake simulation tool; setting earthquake parameters such as earthquake grades, earthquake source positions and the like, and then performing earthquake simulation calculation; through the simulation result, the earthquake performance of the completed construction part, such as the deformation condition, the stress distribution condition and the like of the structure, can be evaluated, so that whether the earthquake performance meets the earthquake safety requirement is judged.
The dangerous area detecting unit 62 is used for detecting a dangerous area in a construction completed part in the BIM model, extracting the construction completed part marked in the BIM model and performing floor detection, specifically detecting the state around each floor slab in the model, and marking the area around which a blank exists as a dangerous area, wherein the blank areas may comprise unconnected floors, uneven floor edges, under floors lacking support and the like;
when constructors enter a construction site, the personnel identity recognition unit 63 recognizes identity information of the entering personnel through an image recognition technology, compares the recognized facial features with pictures of construction workers in a construction worker database, judges whether the workers are authorized personnel, and only the authorized personnel can enter a key area to ensure construction safety; if it is determined that it is not an authorized person, the voice alarm unit 66 will sound a voice alarm of "unauthorized person entered";
the safety equipment detection unit 64 is responsible for detecting whether a construction worker wears a helmet correctly in a construction scene, and if it is recognized that a certain construction worker does not wear a helmet correctly, the voice alarm unit 66 will send out a voice alarm of "please wear a helmet correctly";
The personnel position detecting unit 65 is responsible for detecting whether the constructor approaches the dangerous area, detecting the position information of the constructor in real time based on the RFID technology, and if a certain constructor is found to approach the dangerous area, the voice alarm unit 66 will send the constructor 'approach the dangerous area', please notice-! "voice alert.
The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention, but to enable any modification, equivalent or improvement to be made without departing from the spirit and principles of the invention.

Claims (10)

1. Municipal works wisdom building site management system based on BIM technique, its characterized in that: comprising the following steps:
the intelligent building site management center is responsible for managing the signal transmission among the model and data management module, the scheduling management module, the progress management module, the environment and energy management module, the safety management module and the modules;
The model and data management module comprises a BIM model building unit, an engineering block management unit, a database storage unit and a sensor setting unit; building a BIM model according to municipal engineering related data, and determining different engineering blocks according to the model; building a database of construction workers, construction raw materials, construction equipment and a daily BIM model, and placing a plurality of groups of sensors on a construction site for detecting construction related information;
the dispatching management module comprises a total construction plan determining unit, a daily construction plan determining unit, a work and rest management unit, a construction worker management unit, a construction equipment management unit and a construction raw material management unit; making a total construction plan and a daily construction plan, carrying out scheduling management on construction workers, construction raw materials and construction equipment according to the engineering quantity of each engineering block, and monitoring the working condition of the construction workers, the in-out condition of the construction raw materials and the operation condition of the construction equipment in real time;
the progress management module comprises a daily progress management unit, a progress delay early warning unit and a delay reason analysis unit; judging whether the daily actual construction progress reaches the specified construction progress, if not, sending delay early warning and providing a solution;
The environment and energy management module comprises a sensor placement unit, a noise monitoring unit, a smoke monitoring unit, a temperature monitoring unit, an environment alarm unit, a water spray control unit and an energy use and emission analysis unit; monitoring various indexes in the construction environment in real time, sending out an alarm and taking corresponding measures when the indexes exceed corresponding thresholds; simulating energy use and emission conditions of the building by using the BIM model and real-time environment data, and judging whether optimization is needed;
the safety management module comprises a structure detection unit, a dangerous area detection unit, a personnel identity recognition unit, a safety equipment detection unit, a personnel position detection unit and a voice alarm unit, wherein the structure detection unit comprises a size measurement unit, a stress analysis unit and an earthquake simulation unit; safety management is carried out on the municipal engineering intelligent construction site from two aspects of personnel safety and building safety.
2. The BIM technology-based municipal engineering intelligent building site management system according to claim 1, wherein:
the BIM model building unit is responsible for collecting data related to municipal engineering projects, building geometric shapes, component attributes and relations of the models according to design files and construction drawings by using BIM software based on the collected data, and setting coordinates and datum points of the models;
The building block management unit divides the BIM model into a plurality of engineering blocks according to the BIM model and related construction logic, wherein the engineering blocks comprise building structure engineering blocks, building decoration engineering blocks, electromechanical engineering blocks, traffic engineering blocks, heating and ventilation engineering blocks, water supply and drainage engineering blocks and landscape engineering blocks;
the storage unit is responsible for creating a database of construction workers, construction raw materials, construction equipment and daily BIM models; the construction worker database stores related information of each construction worker, including names, photos, ages, work ages, allocated working time and responsible engineering block information; the building raw material database stores the related information of all raw materials used in construction, including raw material names, consumption, stock, engineering blocks used and unit cost information;
the construction equipment database can store relevant information of equipment used in construction, including equipment names, equipment use time, equipment maintenance conditions, engineering blocks used by the equipment and equipment user data; the daily BIM model database stores the BIM model updated every day, namely, after the construction is finished every day, the completed construction part is marked in the BIM model, and the marked BIM model is stored in the daily BIM model database;
The sensor setting unit is responsible for placing a plurality of groups of internet of things equipment on a construction site for collecting real-time data of the construction site, and comprises a monitoring camera, a displacement sensor, a noise monitor, a smoke sensor and a temperature sensor.
3. The BIM technology-based municipal engineering intelligent building site management system according to claim 1, wherein:
the total construction plan determining unit calculates the total engineering quantity of municipal engineering according to the BIM model, wherein the total engineering quantity is represented by the sum of the volumes of all engineering blocks in the BIM; the method comprises the steps of making a total construction plan according to total engineering quantity, preset delivery time and construction difficulty, and specifically comprises the estimated engineering quantity and expected construction days of each engineering block, the total number of allocated construction workers, the total number of expected material use and the total number of equipment requirements;
the daily construction plan determining unit is used for making a next-day work task for a construction worker after the construction task of each day is finished, and specifically, obtaining daily expected workload according to the estimated engineering quantity and the expected construction days of each engineering blockWherein->Indicate->The expected workload of each engineering block is the same every day;
and the work and rest management unit is responsible for formulating construction work and rest of construction workers and adjusting in real time according to environmental factors.
4. The smart building site management system for municipal works based on BIM technology according to claim 3, wherein:
the construction worker management unit is used for tracking and managing construction workers on a construction site through a BIM model and an RFID technology, and particularly is used for providing each worker with an RFID label, and when the construction workers enter the construction site, the information of the construction workers is automatically recorded and updated into the BIM model; the system can display the information of the number of people, the position and the working state of the construction site in real time; when a construction worker leaves a construction site, recovering the RFID tag, and storing the time of the construction worker at the time in a construction worker database;
the construction equipment management unit monitors and manages mechanical equipment on a construction site by utilizing a BIM model and a sensor technology, specifically, after the construction equipment is identified by a monitoring camera, the running state and the service condition information of the equipment are obtained, and data are integrated into a BIM model and a construction equipment database; the system can display the distribution, running state and load information of the equipment in real time;
the building raw material management unit tracks and manages materials of a construction site through a BIM model and an RFID technology, and particularly, each material is provided with an RFID label, and when the material enters the construction site, the information of the material is automatically recorded and updated into the BIM model; the system can display the material stock, the use condition and the distribution information of the construction site in real time.
5. The smart building site management system for municipal works based on BIM technology according to claim 3, wherein:
after the daily construction is finished, the daily schedule management unit updates the BIM model according to the actual construction amount, takes out the BIM model of the previous day from the daily BIM model database, and takes the difference of the marked area volumes in the two BIM models as the actual construction workload; to actually construct the work loadCompared with the expected construction workload set on the same day +.>Wherein->Is a positive integer greater than 1, if/>Then the construction workload up to date is proved to be up to standard, and the construction workload which is finished in excess is recordedAnd adding the current overcomplete construction workload and the previous overcomplete construction workload to obtain the new construction workload sum +.>The method comprises the steps of carrying out a first treatment on the surface of the If->Then the present construction workload is not up to standard, and the incomplete construction workload is recorded>Sum of construction workload completed in excess before +.>Construction effort not completed to date>In comparison, if->The workload which is finished excessively before can be counteracted with the presently unfinished construction workload, namely, the subsequent engineering workload distribution is not required to be adjusted, and the difference value between the sum of the workload which is finished excessively and the presently unfinished construction workload is taken as the new sum of the workload which is finished excessively >The method comprises the steps of carrying out a first treatment on the surface of the If->Indicating a previous overcomplete jobThe progress delay early warning unit sends delay early warning to the construction group leader if the quantity is insufficient to offset the today's incomplete construction workload.
6. The BIM technology-based municipal engineering intelligent building site management system according to claim 5, wherein:
after the daily schedule management unit judges that the workload which is finished excessively before is insufficient to offset the work workload which is not finished today, the following solution is provided:
taking the difference between the currently unfinished construction workload and the sum of the excessive finished workload as the new currently unfinished construction workloadUnfinished workload->Pre-assigned to the work task of the following day, the average workload of each construction worker of the following day is calculated>The method specifically comprises the following steps:
wherein the method comprises the steps ofRepresenting the total number of construction workers;
the calculated average workload is compared with the maximum workload which can be born by the construction workersIn comparison, the maximum amount of work that the construction worker can withstand +.>Is related to the average working age, age and weather condition of the construction workers on the following dayClosing;
if it isThe method comprises the steps of pre-distributing the work load which does not reach the expected work load to the work task of the following day, wherein the work load does not exceed the maximum work load which can be born by construction workers, and pre-distributing the work load which does not reach the expected work load to the work task of the following day;
If it isIf the expected workload is not pre-distributed to the work task of the next day, the workload of the next day is too large to exceed the maximum workload which can be born by the construction workers, and the judgment is needed that if the expected workload is not pre-distributed to the next day>In the daily work task, whether the construction worker can bear the updated workload is specifically as follows:
wherein,the expected construction residual days of the engineering block cannot be exceeded;
if presentSo that->Then it means pre-assigning the workload which did not reach the expected one to the back +.>In daily work tasks, the maximum workload which can be born by construction workers is not exceeded, and the workload which does not reach the expected workload is pre-distributed to the post->In the daily work task;
if not presentSo that->And the method indicates that the residual daily workload exceeds the maximum workload which can be born by the construction workers in the expected construction days, and sends out overtime construction instructions.
7. The BIM technology-based municipal engineering intelligent building site management system according to claim 6, wherein:
after the construction delay is judged, the delay reason analysis unit analyzes the reason of the delay and sends the result to the related manager, and the method specifically comprises the following steps: judging whether the construction workers have false work according to the working time data of the construction workers; judging whether the construction delay is related to the small number of construction equipment or faults according to the service time of the construction equipment and the maintenance record; judging whether the building raw materials are in insufficient stock or not according to the in-out data of the building raw materials; the relevant data are obtained from the corresponding database.
8. The BIM technology-based municipal engineering intelligent building site management system according to claim 1, wherein:
the sensor placing unit marks a daily construction area in the BIM model, analyzes a source area generated by noise and smoke, and selects a corresponding sensor placing position;
the noise monitoring unit is used for monitoring noise generated during construction by using the noise monitor, when detecting that the noise level measured by a certain noise monitor exceeds a set threshold value, the noise monitoring unit is positioned in the BIM model to the area where the noise monitor is positioned, and the environment alarm unit sends out an excessive noise alarm to the area where the noise monitor is positioned;
the smoke monitoring unit is used for monitoring the smoke concentration generated during construction by using a smoke sensor, when detecting that the smoke concentration level measured by a certain smoke sensor exceeds a set threshold value, the smoke monitoring unit is positioned in a region where the smoke sensor is positioned in the BIM model, and the water spraying control unit is used for controlling a water sprayer in the region where the smoke sensor is positioned to start to operate;
a temperature monitoring unit for monitoring temperature change in the construction area by using a temperature sensor, and notifying a work and rest management unit in the dispatching management module to adjust construction work and rest of construction workers when detecting that the temperature of a certain area is higher than the upper limit of the set threshold range or lower than the lower limit of the set threshold range;
The energy use and emission analysis unit is responsible for simulating the energy use and emission conditions of the building by utilizing the BIM model and real-time environment data, and specifically importing the BIM model into selected energy simulation software; setting simulation parameters according to actual construction conditions and environmental data, wherein the simulation parameters comprise design parameters of a building, performance parameters of building equipment, parameters of building raw materials and environmental conditions, and the environmental parameters represent parameters measured by a sensor; after the simulation program is operated, simulation results are obtained, wherein the simulation results comprise energy consumption and emission of the building in different time periods; analyzing the result, and if the consumption and the emission of the energy source are in a normal range, optimizing is not needed; if the consumption and the discharge of the energy are not in the normal range, the environment alarm unit gives an abnormal alarm of the energy to the manager and provides an optimization scheme, including changing the energy-efficient equipment and improving the architectural design.
9. The BIM technology-based municipal engineering intelligent building site management system according to claim 1, wherein:
the structure detection unit is used for detecting the structure problem of the completed construction part in the BIM;
the dangerous area detection unit is used for detecting a dangerous area in a construction completed part in the BIM model, extracting the part marked in the BIM model and completing construction, carrying out floor detection, specifically detecting the state around each floor plate in the model, marking a blank area around the part as a dangerous area, wherein the blank area comprises unconnected floors, uneven floor edges and floors under the lack of support;
When constructors enter a construction site, the personnel identity recognition unit recognizes identity information of the entering personnel through an image recognition technology, compares the recognized facial features with pictures of construction workers in a construction worker database, judges whether the construction workers are authorized personnel, and if the construction workers are not authorized personnel, the voice alarm unit sends out voice alarms;
the safety equipment detection unit is in charge of detecting whether a construction worker wears the safety helmet correctly in a construction scene, and if the construction worker is identified that the construction worker does not wear the safety helmet correctly, the voice alarm unit sends out a voice alarm;
and the personnel position detection unit is in charge of detecting whether constructors approach the dangerous area or not, detecting the position information of the construction workers in real time based on the RFID technology, and sending a voice alarm to the construction workers by the voice alarm unit if the construction workers are found to approach the dangerous area.
10. The BIM technology-based municipal engineering intelligent building site management system according to claim 9, wherein:
the structure detection unit comprises:
using a measuring tool to measure the size of the completed construction part in the BIM model; selecting components to be measured, including walls, columns and beams, and measuring by a dimension measuring unit; the measurement result is used for checking whether the construction meets the design requirement;
Carrying out stress analysis on the support column to judge whether the stress is uniform or not: firstly, establishing a model of a support column in a BIM model, and adding corresponding constraint conditions; then the stress analysis unit utilizes a structural analysis tool to carry out stress analysis on the support column to obtain stress distribution and deformation conditions of the support column, and judges whether the stress of the support column is uniform and whether reinforcement or adjustment is needed;
the earthquake simulation unit is used for carrying out earthquake simulation on the completed construction part by utilizing an earthquake simulation tool; performing earthquake simulation calculation by setting earthquake parameters; and (5) evaluating the seismic performance of the completed construction part through a simulation result, and judging whether the seismic performance meets the seismic safety requirement.
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CN111241618A (en) * 2020-01-08 2020-06-05 中国建筑第二工程局有限公司西南分公司 Intelligent construction site information processing method and system based on BIM model and application
CN113988647A (en) * 2021-10-29 2022-01-28 上海市浦东新区建设(集团)有限公司 Municipal works wisdom building site management system based on BIM
CN115131173A (en) * 2022-06-30 2022-09-30 江西大正智能信息技术有限公司 Intelligent construction site safety monitoring system and monitoring method
CN115278543A (en) * 2022-07-18 2022-11-01 中铁第四勘察设计院集团有限公司 Intelligent building site system based on BIM
CN115953278A (en) * 2022-12-03 2023-04-11 中国建筑第二工程局有限公司 Municipal works wisdom building site management system based on BIM

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