CN-121990461-A - Digital monitoring method for airport net rack lifting and installing process based on BIM and three-dimensional scanning fusion

CN121990461ACN 121990461 ACN121990461 ACN 121990461ACN-121990461-A

Abstract

The invention discloses a digital monitoring method for an airport net rack lifting and installing process based on BIM and three-dimensional scanning fusion, which relates to the technical field of digital construction monitoring of constructional engineering and comprises the following steps of: in the whole lifting process of the airport net rack, a whole process digital monitoring system is established, the space position data, the lifting point height data and the environment vibration data of each node are continuously collected, and all the collected real-time data are uniformly converted into time alignment sequences. According to the invention, through time-aligned multi-source digital monitoring, real-time tracking of node space positions, lifting point heights and vibration data is realized, support rigidity attenuation and node yield are accurately identified, and dynamic monitoring of the whole grid lifting process is realized. And through yield early warning distribution and flexible back-dragging control, the displacement of the lifting point is corrected in real time, so that the sinking trend is gradually converged, and the safety and the forming precision of the lifting of the net rack are ensured.

Inventors

WANG ZHIHUI
LU SIXING
ZHANG FAN
ZHOU PENGFEI
WANG LEI
DING WEIXIANG
YUAN LIJUN
YUE JUN
FENG LEI
JIANG ZHIQIANG
GUO YANLONG
Qi yongfeng
WANG FUBIAO

Assignees

中建三局集团有限公司
中建三局第三建设工程有限责任公司

Dates

Publication Date: 20260508
Application Date: 20260128

Claims (8)

1. The digital monitoring method for the airport net rack lifting installation process based on BIM and three-dimensional scanning fusion is characterized by comprising the following steps of: in the integral lifting process of the airport net rack, a whole process digital monitoring system is established, the space position data, the lifting point height data and the environmental vibration data of each node are continuously collected, and all the collected real-time data are uniformly converted into a time alignment sequence; Based on the time alignment sequence, carrying out continuous differential calculation on the height data of each node, extracting fine jump appearing in the node height change curve, and forming a node height jump list; Calculating the difference of the node height change rate and the movement trend by using the node height jump list and combining the displacement direction data and the ascending speed data of the nodes at the same moment, identifying the node position where the supporting rigidity is temporarily weakened, and generating node yield early warning distribution data; tracking a spatial diffusion track of a node sinking trend based on node yield early warning distribution data, calculating the micro correction amplitude of each hanging point, and summarizing to form an integral lifting adjustment parameter table; And according to the integral lifting adjustment parameter table, executing dynamic synchronous control, and adjusting lifting speed and displacement in a flexible dragging mode of alternately slowly lifting and zoning misphasing, so that the sinking trend gradually converges to the design reference in the correction process.
2. The method for digitally monitoring the lifting and installing process of the airport net rack based on BIM and three-dimensional scanning fusion according to claim 1, wherein the time alignment sequence generation step is as follows: Before the grid frame is lifted, a three-dimensional space coordinate system is established by taking design coordinates in a building information model as a reference, the position of a coordinate origin, the three-dimensional direction and a unit scale are determined, all nodes are numbered, and the plane position of the nodes, the height of the nodes, the connection relation of hanging points and the initial elevation are recorded; After the space coordinate system is established, continuously acquiring node space position data, lifting point height data and environmental vibration data by using a high-precision distance measuring device, and adding a time mark for each group of data to ensure that all acquired data are consistent in time record; after data acquisition is completed, all data files are sorted according to a time identification sequence, a unified time main shaft is established, continuous time periods are divided, and space position data, lifting point height data and environmental vibration data are mapped to the same time main shaft; After the time arrangement is finished, time alignment processing is carried out by taking the construction progress as a reference, so that the space position change curve, the lifting point height change curve and the vibration response curve are synchronously overlapped, and a continuous time alignment sequence is generated.
3. The method for digitally monitoring the lifting and installing process of the airport net rack based on BIM and three-dimensional scanning fusion according to claim 2, wherein the node height jump list forming process is as follows: After the time alignment sequence is established, the height data of each node in the whole lifting period are sorted according to the time sequence to form a continuous height change record containing the node number, the time mark and the hanging point mark, and the missing measurement data is complemented through linear interpolation; After finishing the height data arrangement, carrying out continuous difference processing on the height change curve of each node at fixed time intervals to generate a node height change rate sequence, so that the difference result of each node is kept synchronous with the time mark; After the height difference data are generated, identifying a height jump according to a difference change trend in a continuous time period, and judging that the node is abnormal in instantaneous displacement when the height change quantity of the node in adjacent time intervals has obvious difference and the direction is inconsistent with the lifting direction of the lifting point; After the jump identification is completed, the jump events of all the nodes are summarized according to the time sequence, and the jump time, the jump amplitude, the jump direction, the jump duration and the spatial relation of adjacent nodes are recorded to form a node height jump list.
4. The method for digitally monitoring the lifting and installing process of the airport net rack based on BIM and three-dimensional scanning fusion according to claim 3, wherein after a node height jump list is formed, the jump amplitude, the jump direction and the jump duration recorded in a jump event are subjected to correlation analysis with the lifting point lifting height, adjacent nodes with the jump are identified according to the time sequence and the space distribution of the occurrence of the jump, the stress concentration area of a local structure is determined, and a jump distribution map is generated based on the space coordinates of the nodes.
5. The method for digitally monitoring the lifting and installing process of the airport net rack based on BIM and three-dimensional scanning fusion according to claim 3, wherein the node yield early warning distribution data generation step is as follows: after the node height jump list is generated, taking a jump node as an analysis object, extracting space displacement direction data and ascending speed data of continuous time periods before and after the jump, and establishing a dynamic data sequence covering the whole process of the jump by taking the jump time as a center; After finishing the node dynamic data sequence, analyzing the height change rate and the movement trend of the time period before and after the jump, and identifying the weakening state of the node supporting rigidity when the height change rate of the node is reduced and the displacement direction deviates from the integral lifting direction in the jump time period; After the support rigidity weakening nodes are identified, node numbers, spatial positions, kick amplitude, kick duration, displacement direction deviation angles, rising speed change rates and the number of adjacent nodes are summarized, and node yield early warning distribution data are generated.
6. The digital monitoring method for the airport net rack lifting installation process based on BIM and three-dimensional scanning fusion according to claim 5, wherein in the generation process of node yield early warning distribution data, the spatial positions of supporting rigidity weakening nodes in the same time period are aggregated, a concentrated distribution area of yield nodes in space is identified by comparing the consistency of the spatial distance and displacement direction among the nodes, and a yield early warning spatial diffusion track is formed according to the distribution continuity.
7. The method for digitally monitoring the lifting and installing process of the airport net rack based on BIM and three-dimensional scanning fusion according to claim 5, wherein the step of generating the integral lifting and adjusting parameter table is as follows: After node yield early warning distribution data are formed, sorting the spatial position, yield occurrence time, kick amplitude, displacement direction change angle and kick duration of yield nodes, and constructing node combinations with continuous time and spatial adjacent; after the nodes are combined and formed, connecting the space positions of the yield nodes according to time sequence, tracking the diffusion direction and speed of the yield region, and determining the diffusion starting point, the end point, the duration time and the coverage range of the yield region; After the diffusion path of the yield area is determined, according to the geometrical layout of the net rack and the connection relation of the rod pieces, the node range controlled by the hanging points is defined, the space distance between the hanging points and the yield nodes and the stress transmission path are calculated, and an association list of the hanging points and the yield nodes is formed; after the association relation between the hanging point and the yield node is determined, calculating the correction direction and the correction amplitude of the hanging point by taking the jump amplitude, the yield duration time, the yield direction and the hanging point influence weight of the yield node as parameters; After the calculation of the lifting point correction amplitude is completed, the lifting point number, the correction direction, the correction amplitude, the correction period and the number of controlled nodes are summarized to form an integral lifting adjustment parameter table.
8. The method for digitally monitoring the lifting and installing process of the airport net rack based on BIM and three-dimensional scanning fusion according to claim 7, wherein the method is characterized in that dynamic synchronous control is executed according to an integral lifting adjustment parameter table, lifting speed and displacement of each lifting point are adjusted in a flexible dragging mode of alternately slowly lifting and zoning misplacement, and the sinking trend is converged to a design reference step in the correction process as follows: Before executing dynamic synchronous control, analyzing and dividing the region of all lifting point data in the integral lifting adjustment parameter table, dividing lifting partitions according to the spatial position, the correction direction and the correction amplitude of the lifting points, and establishing a time synchronous sequence table to determine the starting time and the adjustment sequence of the lifting points; After the partition and time synchronization relation is established, implementing alternate slow-lifting control, firstly starting a main lifting hanging point group in a central area to slowly lift, then sequentially entering an operating state by auxiliary hanging points in a peripheral area, and realizing balanced distribution of structural stress through time-sharing lifting; after the alternate slow-rise stage is completed, flexible back dragging operation of partition phase staggering is implemented, the phase staggering execution sequence is determined according to the correction period in the parameter table, and the displacement amplitude and speed proportion of the hanging point are adjusted, so that the stress of the sinking area is gradually released, and the structural form tends to be smooth; After the alternate slow lifting and the zonal misplacement back dragging are completed, dynamic synchronous stable control is carried out, and the lifting speed and displacement of each lifting point are continuously coordinated by comparing the real-time height of the lifting point with the target height to enable the grid form to be converged to the design reference position.

Description

Digital monitoring method for airport net rack lifting and installing process based on BIM and three-dimensional scanning fusion Technical Field The invention relates to the technical field of digital construction monitoring of constructional engineering, in particular to a digital monitoring method for an airport net rack lifting and installing process based on BIM and three-dimensional scanning fusion. Background The digital monitoring of the airport net rack lifting installation process based on BIM and three-dimensional scanning fusion refers to the realization of visual, quantifiable and traceable monitoring of lifting height, node alignment, overall camber and local deformation by continuously comparing the actual posture and theoretical alignment of the net rack at different lifting stages in the same coordinate system by taking a BIM model as a unified design reference and taking a high-density point cloud obtained by three-dimensional scanning as a field real state in the whole process from ground assembly to overall lifting formation of the airport large-span net rack and by continuously comparing the two in the same coordinate system. Based on BIM and three-dimensional scanning fusion, the method uses complete design geometry, node coordinates and lifting paths in a BIM model as theoretical frames, obtains on-site fine point clouds by three-dimensional scanning, and matches actual forms with theoretical forms in a unified coordinate system, so that differences between on-site states and design references can be directly quantized, displayed and analyzed. The digital monitoring of the airport net rack lifting installation process means that three-dimensional data are continuously acquired in the whole lifting period of the net rack, a design model is aligned in real time, a deviation cloud image and a linear change curve are output, an analysis result is fed back to the next lifting adjustment, the accurate control and error closed loop correction of the whole process are realized, and the finally formed space line shape is consistent with the design geometry. The prior art has the following defects: In the prior art, the airport net rack mainly relies on manual measuring points or local monitoring means to judge the structural state in the lifting and mounting process, and continuous dynamic identification of the node state is difficult to realize. When the support system yields transiently under complex stress conditions, it tends to exhibit only very slight geometric changes, rather than significant structural deformations. For example, in the process of comparing the three-dimensional scan with the superposition of the BIM model, a part of nodes can generate high and slight jump, and the prior art generally regards the jump as measurement noise or scanning error, and does not perform deep analysis and identification. However, this seemingly small jump is essentially an early sign of the node support system yielding at the transient stress peak, reflecting the transient decay of the local support stiffness. If the abnormal signal is not recognized and interfered in time, the node will generate a sinking trend due to the bearing capacity reduction in the next round of lifting, so as to form a local collapse area. At this time, the stress direction of the peripheral rod pieces will be suddenly changed to generate a reverse folding effect, so that the stress system of the area structure is destroyed, and linkage instability and even local slump are caused. The above information disclosed in the background section is only for enhancement of understanding of the background of the disclosure and therefore it may include information that does not form the prior art that is already known to a person of ordinary skill in the art. Disclosure of Invention The invention aims to provide a digital monitoring method for an airport net rack lifting and installing process based on BIM and three-dimensional scanning fusion, so as to solve the problems in the background technology. In order to achieve the purpose, the invention provides the technical scheme that the digital monitoring method for the airport net rack lifting and installing process based on BIM and three-dimensional scanning fusion comprises the following steps: In the whole lifting process of the airport net rack, a whole process digital monitoring system is established, the space position data, the lifting point height data and the environmental vibration data of each node are continuously collected, and all the collected real-time data are uniformly converted into time alignment sequences so as to ensure that different data sources have comparability under the same time frame; Based on the time alignment sequence, carrying out continuous differential calculation on the height data of each node, extracting fine jump appearing in the node height change curve, and forming a node height jump list for reflecting the instantaneous displacement abnorma