CN-121980858-A - Collaborative deformation monitoring point layout method and collaborative deformation monitoring system for existing subway upper cover

CN121980858ACN 121980858 ACN121980858 ACN 121980858ACN-121980858-A

Abstract

The invention discloses a collaborative deformation monitoring point layout method and a collaborative deformation monitoring point layout system for existing subway parking base upper cover development engineering, and belongs to the technical field of structural deformation monitoring. The method comprises the steps of determining a cooperative deformation influence area, identifying structural joints and a force flow transmission path in the area, dynamically arranging settlement monitoring points based on a structural joint settlement threshold value, continuously arranging strain, rotation angles and three-dimensional strain monitoring points along the force flow transmission path to form a linear candidate monitoring point set, generating a two-dimensional grid candidate point set in the influence area, carrying out topological superposition analysis based on Delaunay triangulation network and Voronoi diagram on the two types of candidate point sets, deleting redundant grid points through a distance threshold value, supplementing monitoring blind area points through uniformity checking, and outputting a final monitoring point coordinate set. The invention solves the problems of no system or high cost of the traditional method, and realizes the uniformity of systematicness, economy and space coverage uniformity of the arrangement of the monitoring points.

Inventors

RUI YUAN
LI YANQIANG
MOU WENBO
DANG LEITAO
ZHANG XIANHONG
ZHANG NA

Assignees

西安轨道交通投资发展有限责任公司

Dates

Publication Date: 20260505
Application Date: 20260116

Claims (11)

1. The cooperative deformation monitoring point layout method for the existing subway upper cover is characterized by comprising the following steps of: Step S1, expanding the plane projection range of the upper cover structure and the plane range of the subway train parking area outwards by a preset distance, and taking the envelope of the two expansion areas as the cooperative deformation influence area; S2, in a cooperative deformation influence area, identifying structural joints of an existing subway parking base and a force flow transmission path for transmitting structural loads of an upper cover to the base; Step S3, based on the structural joint and the force flow transmission path, linear candidate monitoring points with definite mechanical significance are laid to form a linear candidate monitoring point set; And S4, performing topology superposition analysis on the linear candidate monitoring point set and the grid candidate monitoring point set, deleting redundant grid candidate monitoring points according to a preset optimization rule, supplementing the monitoring points according to the space distribution uniformity requirement, and forming a final monitoring point coordinate set, wherein the topology superposition analysis comprises the construction of a Delaunay triangle network and/or a Voronoi diagram.
2. The method of claim 1, wherein the arrangement of the linear candidate monitoring points based on the structural joints comprises setting a construction period settlement threshold and an operation period settlement threshold for each structural joint, and arranging encryption settlement monitoring points on two sides of the structural joint along the connection direction when the measured settlement amount of the monitoring points at the structural joint exceeds the corresponding threshold.
3. The method of claim 2, wherein routing linear candidate monitoring points based on the force flow path includes placing strain monitoring points at bending moment distribution, placing corner monitoring nodes at force flow direction turns, and placing three-dimensional strain relief monitoring points at standoff anchor areas along the force flow path.
4. A method according to claim 3, wherein the set of grid candidate monitoring points is generated by constructing a two-dimensional grid within the co-deformation influence region and outputting grid nodes as candidate points, the candidate points being output as three-dimensional coordinates.
5. The method of claim 4, wherein the predetermined optimization rule includes calculating a planar Euclidean distance from each grid candidate monitoring point to a nearest linear candidate monitoring point, and deleting the grid candidate monitoring point if the distance is less than a predetermined first threshold D th .
6. The method of claim 5, wherein after deleting a portion of the grid candidate monitoring points, the supplementing monitoring points according to the spatial distribution uniformity requirement comprises constructing a Voronoi diagram with all the reserved candidate monitoring points as generator elements, and supplementing at least one monitoring at a maximum blank circle center position in a certain Voronoi unit if the maximum inscribed circle radius of the unit is greater than Dmax/2.
7. The method according to any one of claims 1-6, wherein the force flow transmission path is determined by determining the maximum bending moment position and the support position of the main beam of the upper cover structure according to the design internal force diagram of the main beam of the upper cover structure, and sequentially connecting the maximum bending moment position, the support position of the upper cover structure, the existing subway parking base bearing member node and the foundation support area to form the force flow transmission path.
8. The collaborative deformation monitoring system for the existing subway upper cover for realizing the method of claim 7 is characterized by comprising a key element identification module, a candidate point set generation module, a topology optimization and execution module and a topology optimization and execution module, wherein the key element identification module is used for identifying structural joints of an existing subway parking base and a force flow transmission path for transmitting structural loads of the upper cover to a foundation in a collaborative deformation influence area, the candidate point set generation module is used for generating a linear candidate monitoring point set based on the structural joints and the force flow transmission path and generating a grid candidate monitoring point set in the collaborative deformation influence area, the topology optimization and execution module is used for carrying out topology superposition analysis on the linear candidate monitoring point set and the grid candidate monitoring point set, deleting redundant points according to preset optimization rules and supplementing monitoring points according to uniformity requirements and generating and outputting a final monitoring point coordinate set, and the topology optimization and execution module is built-in or calls an algorithm unit for constructing a Delaunay triangle network and/or a Voronoi graph.
9. The system of claim 9, wherein the settlement monitoring point sub-module is configured to set a settlement threshold for each structural joint and dynamically deploy settlement monitoring points at structural joint locations and on both sides thereof based on a comparison of measured settlement amounts to the threshold, the strain and rotation angle monitoring point sub-module is configured to deploy strain monitoring points according to a bending moment distribution along the force flow transmission path, deploy rotation angle monitoring nodes at force flow folds, deploy three-dimensional strain-relief monitoring points at support anchor areas, and the grid generation sub-module is configured to construct a two-dimensional grid within the collaborative deformation influence area and output the grid nodes as a grid candidate monitoring point set in a three-coordinate form.
10. The system of claim 9, wherein the distance calculation and redundancy elimination sub-module is configured to calculate a planar Euclidean distance from each grid candidate monitoring point to a nearest linear candidate monitoring point and compare with a first threshold D th to eliminate grid candidate monitoring points with a distance less than the first threshold, and wherein the uniformity checking and point replacement sub-module is configured to construct a Voronoi graph based on the retained candidate monitoring points, calculate feature sizes of each Voronoi cell and compare with Dmax/2 to supplement monitoring points in cells with feature size overrun.
11. The system of claim 9, further comprising a data fusion and coordinate acquisition module for acquiring three-dimensional point cloud data of an existing subway parking base and an upper cover structure building information model, and performing registration fusion on the three-dimensional point cloud data and the upper cover structure building information model under a unified coordinate system to extract three-dimensional coordinates of each candidate monitoring point from the fusion model.

Description

Collaborative deformation monitoring point layout method and collaborative deformation monitoring system for existing subway upper cover Technical Field The invention belongs to the technical field of engineering structure safety monitoring, and particularly relates to a method and a system for arranging cooperative deformation monitoring points of an existing subway upper cover, which are suitable for structural cooperative deformation monitoring of an existing subway train yard under the condition of upper cover property/commercial development. Background With the increasing shortage of urban land resources, the utilization of the existing subway parking base for upper cover development has become an important way for comprehensive development of the land along the track traffic line. Such projects typically add new floors or high-rise buildings above the existing subway parking bases, and the vertical load of the upper cover structure is transferred to the existing vehicle base structure and foundation through the new support members. The engineering relates to the cooperative control of the load bearing capacity evaluation of the existing structure and the deformation of the newly built structure, and the monitoring precision of the engineering is directly related to the operation safety of the subway below and the stability of the building above. The following remarkable characteristics exist in the engineering: The method comprises the steps of (1) intensively stopping a subway train and repeatedly and dynamically loading caused by starting and stopping the subway train, acting on an existing structure together with constant load, active load and the like of an upper cover building, (2) connecting an existing subway parking base with the upper cover structure through newly added members such as beams, columns and brackets, stress concentration, differential settlement and cooperative deformation are easy to form at structural joints and connecting positions, (3) enabling a cantilever section of the upper cover structure to be ubiquitous, enabling bending moment and shearing force of a cantilever root area to be large, enabling torsion and shearing hysteresis effect to easily occur, and being sensitive to safety influence of the existing structure, (4) being limited by construction conditions, monitoring equipment arrangement space is limited, and the number of monitoring points and distribution positions need to be balanced between safety and economy. In the prior art, more researches are developed aiming at building structures, safety monitoring and upper covers, and the following ideas are generally adopted: The method comprises the steps of carrying out stress and deformation analysis on the whole or part of a structure by utilizing finite element analysis, identifying areas with larger stress concentration or displacement, arranging monitoring points in the local areas, carrying out deformation monitoring and early warning on the structures such as construction equipment, a factory building and a station based on BIM model and sensor data, and carrying out optimization to a certain extent on the number and positions of the monitoring points by adopting methods such as an optimization algorithm, topology analysis or cluster analysis. However, for the specific scenario of "existing subway parking base coverage development project", the following drawbacks still exist in the prior art: Most methods are only aimed at a single structural system (such as a newly built station, a steel structure factory building or a scaffold, etc.), and lack of overall consideration of the cooperative action of the existing vehicle base and the upper cover structure; The method has the advantages that the method is difficult to consider settlement risk identification and monitoring cost control nearby structural joints due to the lack of a specific monitoring point layout strategy for uneven settlement risks of the structural joints of the existing subway parking base, the problem that key force flow turning part monitoring points are lost or unreasonable to distribute easily due to the lack of a system method for distributing points along a complete force flow transmission path of an upper cover girder, a supporting member and a vehicle base bearing member and a base is solved, and the problem that the number of monitoring points is too many or uneven to distribute due to the lack of an effective topology optimization method for redundancy between high-density grid monitoring points and linear monitoring points along the force flow transmission path and the structural joints is solved. Disclosure of Invention The invention aims to solve the problems that an existing vehicle base structure and an existing upper cover structure work cooperatively, loads are complex, key parts are sensitive to deformation and the like in the existing subway parking base upper cover development project, and provides a cooperative deformati