Municipal road foundation pit pipeline clear distance monitoring, sealing and controlling system, method and assembly

Abstract

The invention discloses a municipal road foundation pit pipeline clear distance monitoring, sealing and controlling system, method and assembly. The system comprises a clear distance measurement assembly, an edge gateway controller, a physical sealing control actuator, a sealing control in-place feedback device and a construction process control module. The clear distance measuring assembly collects clear distance data of the supporting component and the existing municipal pipeline; the gateway obtains data of at least three measurement sections in the axial direction of the pipeline, each section comprises a first clear distance measurement point and a second clear distance measurement point, the minimum clear distance of the sections is taken, and the global minimum clear distance is solved; the clear distance approximation rate is calculated according to adjacent samples, and the credibility is evaluated based on missing measurement, jump, drift and calibration validity period. When the global minimum clear distance is not larger than a sealing control clear distance threshold value, or the approaching rate is not smaller than a sealing control rate threshold value, or the credibility is lower than a threshold value, a sealing control instruction is output, an actuator implements sealing control, a feedback device returns to an in-place state to form a closed loop, and a process control module interlocks an operation equipment control loop and / or a passing control device. And prohibiting the dangerous process from starting and / or prohibiting passage.

Description

Technical Field

[0001] This invention relates to the field of safety management for municipal engineering construction and protection of underground pipelines, and in particular to a monitoring and control system, method and components for monitoring and controlling the net distance between pipelines in municipal road foundation pits. Background Technology

[0002] During the construction of municipal road foundation pits, underground pipelines such as water supply and drainage, gas, heating, electricity, and communications often exist. Excavation, dewatering, and construction loads alter the soil's stress state, causing ground deformation. The supporting structure may also shift or rotate, changing the relative position between the foundation pit structure and existing pipelines. When the distance between them continuously decreases or changes out of control, existing pipelines may experience problems such as compression, tension, loosening of joints, and leakage. In severe cases, this can lead to secondary risks such as road subsidence and gas leaks. Therefore, during foundation pit construction near existing pipelines, continuous monitoring of related risks is necessary, and timely control measures should be taken when required.

[0003] In existing projects, methods such as pre-construction detection and verification, manual inspection combined with ruler measurement, regular observation with total stations or surveying robots, and monitoring of surface settlement and support displacement are commonly used. Some projects also collect data using sensors and set threshold alarms on a platform. While these methods provide some early warning information, they often have shortcomings in actual field operations: First, deformation is not uniform, and risk points may appear in localized areas; insufficient monitoring point deployment can easily miss the most unfavorable locations. Second, the construction environment is complex; factors such as mud, vibration, obstruction, rainwater, dust, and installation and calibration deviations can lead to missing data, abnormal fluctuations, or gradual drift. Relying solely on threshold alarms makes it difficult to control false alarms and missed alarms. Third, the connection between monitoring results and on-site handling is not tight; in many cases, manual judgment and manual work stoppages and barriers are still required, and there is a lack of clear feedback on whether the implementation is in place. Furthermore, determining when to resume work after taking measures such as work stoppages and lockdowns is also a challenge. On-site judgment often relies on experience or temporary rules, which can easily lead to premature resumption causing hidden dangers or delayed resumption affecting the project schedule.

[0004] For the reasons mentioned above, it is necessary to establish a safety management and control method that is more suitable for construction sites, so that monitoring information is more reliable, risk triggering is more timely, and response actions are more verifiable, thereby improving the safety and controllability of construction of foundation pits near existing pipelines. Summary of the Invention

[0005] This invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one object of this invention is to provide a monitoring and control system for the safety clearance of existing pipelines in municipal road foundation pits, comprising:

[0006] The clearance measurement component is used to collect clearance data between the foundation pit support components and existing municipal pipelines;

[0007] An edge gateway controller, communicatively connected to the clearance measurement component, is configured to: acquire clearance data at at least three measurement sections distributed along the axial direction of the existing municipal pipeline, wherein each measurement section includes at least a first clearance measurement point and a second clearance measurement point; for each measurement section, take the minimum value of the clearance data between the first clearance measurement point and the second clearance measurement point to obtain the minimum clearance of the section, and take the minimum value of the minimum clearance of each measurement section to obtain the global minimum clearance; calculate the clearance approximation rate, which is the global minimum clearance at the previous sampling time minus the global minimum clearance at the next sampling time, and then divide by the time difference between adjacent sampling times; perform a reliability assessment based on at least one of the following: missing measurement, jump, drift, and calibration validity period of the clearance data, to obtain a global reliability index; and output a blocking command when any of the following blocking conditions are met: the global minimum clearance is not greater than a preset blocking clearance threshold, or the clearance approximation rate is not less than a preset blocking rate threshold, or the global reliability index is lower than a preset reliability threshold.

[0008] A physical containment actuator is used to implement construction containment in response to the containment command;

[0009] A sealing in place feedback device is used to detect and feedback the sealing in place status of the physical sealing actuator to the edge gateway controller;

[0010] The construction process control module is used to respond to the closure command and output a process control signal to at least one of the operation equipment control loop and the passage control device, so that the preset dangerous process is in at least one of the states of prohibiting start and prohibiting passage.

[0011] In one possible implementation, the foundation pit support component includes a double row of piles and a crossbeam between the piles, with the existing municipal pipeline located below the crossbeam.

[0012] In one possible implementation, the at least three measurement sections include at least: a measurement section corresponding to the mid-span of the pile-beam and two measurement sections near the pile-beam connection node on both sides.

[0013] In one possible implementation, the edge gateway controller is further configured to: upon receiving feedback that the blockade has been completed, perform a deblocking determination; and when the global minimum clearance is not less than a preset deblocking clearance threshold and remains stable for a preset window duration, and the global credibility index is not lower than a preset credibility threshold, and the clearance approach rate is lower than a preset deblocking rate threshold, output a deblocking command to release the construction blockade and restore at least one of the preset dangerous process start permission and access permission, wherein the deblocking clearance threshold is greater than the blockade clearance threshold.

[0014] One object of the present invention is to provide a clearance measurement component for monitoring the safety clearance of existing pipelines in municipal road foundation pits, comprising:

[0015] Side mounting base for support components, used to fix the foundation pit support components;

[0016] A clearance sensor is installed on the side mounting base of the support member for non-contact distance measurement and outputting clearance signal.

[0017] Pipeline-side reference components are used to non-destructively fix them to the outer wall of existing municipal pipelines using clamps. The pipeline-side reference components include a planar reference target plate.

[0018] A direction-finding limiting structure is used to limit the measurement direction of the net distance sensor to the planar reference target plate;

[0019] A protective structure is provided for protecting the clearance sensor; and

[0020] A detachable connection structure is used to realize a detachable connection between the clearance sensor and the side mounting base of the support member;

[0021] The planar reference target plate provides a reproducible distance measurement reference surface for the clearance sensor, thereby enabling the clearance measurement component to output clearance data between the foundation pit support component and the existing municipal pipeline.

[0022] In one possible implementation, the support member side mounting base includes a base plate and an adjustable bracket, and the direction-finding structure includes a positioning element and a locking element, used to lock the measurement direction of the net distance sensor to a preset direction pointing to the planar reference target plate.

[0023] In one possible implementation, the clamp includes a metal band and an elastic pad, and the outer side of the planar reference target plate is provided with at least one of a frame for preventing mud adhesion and a mud scraping structure.

[0024] In one possible implementation, a method for monitoring and controlling the safety clearance of existing pipelines in a municipal road foundation pit is characterized by comprising:

[0025] S1) Set up at least three measurement sections along the axis of the existing municipal pipeline, and set up at least a first net distance measuring point and a second net distance measuring point in each measurement section;

[0026] S2) Collect at least the net distance data of the first net distance measuring point in each measurement section as the first net distance value, and collect the net distance data of the second net distance measuring point in each measurement section as the second net distance value, and record the calibration timestamp at the same time.

[0027] S3) For each measurement section, take the minimum value of the first net distance value and the second net distance value as the minimum net distance of the section, and take the minimum value of the minimum net distance of each measurement section to obtain the global minimum net distance.

[0028] S4) Calculate the net distance approximation rate, which is the value obtained by subtracting the global minimum net distance at the next sampling time from the global minimum net distance at the previous sampling time, and then dividing by the time difference between adjacent sampling times.

[0029] S5) Based on at least one of the missing measurements, jumps, drifts, and calibration validity periods of the net distance data, a credibility assessment is performed to obtain a global credibility index;

[0030] S6) A lockdown trigger event is generated when any of the following conditions are met: the global minimum net distance is not greater than the preset lockdown net distance threshold, or the net distance approach rate is not less than the preset lockdown rate threshold, or the global credibility index is lower than the preset credibility threshold.

[0031] S7) In response to the sealing trigger event, drive the physical sealing actuator to implement construction sealing, and collect sealing in place feedback to determine whether the sealing is in place. At the same time, output process control signal to at least one of the operation equipment control loop and the passage control device, so that the preset dangerous process is in at least one of the states of prohibiting start and prohibiting passage.

[0032] S8) After receiving feedback that the lockdown is in place, continue to collect net distance data and make a decision on unsealing; when the global minimum net distance is not less than the preset unsealing net distance threshold and continues for a preset stable window duration, and the global credibility index is not lower than the preset credibility threshold, and the net distance approach rate is lower than the preset unsealing rate threshold, unsealing is performed and at least one of the preset dangerous procedure start permission and access permission is restored, wherein the unsealing net distance threshold is greater than the lockdown net distance threshold.

[0033] In one possible implementation, the at least three measurement sections include at least: a measurement section corresponding to the mid-span of the pile-beam and two measurement sections near the pile-beam connection node on both sides.

[0034] In one possible implementation, the reliability assessment includes at least one of the following: the global reliability index is reduced when the duration of continuous missing tests exceeds the missing test threshold; the global reliability index is reduced when the net distance difference between adjacent samples exceeds the jump threshold; the global reliability index is reduced when the mean net distance drift within a preset time window exceeds the drift threshold; and the global reliability index is reduced when the time interval between the current sampling time and the calibration timestamp exceeds the calibration validity period.

[0035] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

[0036] Based on the above technical solution, this invention sets up multiple measurement sections along the axial direction of existing municipal pipelines and sets up multiple net distance measurement points on each section. It obtains the global minimum net distance by taking the minimum net distance within each section and then taking the minimum net distance again between sections. This ensures that net distance determination is based on the minimum net distance result within the monitored area, thereby reducing the possibility of missing minimum net distance locations due to single points or a small number of points. Simultaneously, it calculates the net distance approximation rate and uses it in conjunction with the global minimum net distance threshold for closure trigger determination, which is beneficial for early triggering and handling when the net distance rapidly decreases, thus improving response timeliness. Furthermore, it addresses issues such as missing measurements, jumps, drift, and calibration. Data quality factors such as validity period are incorporated into the credibility assessment and form a global credibility index. Even when monitoring data is abnormal or insufficient in validity, the sealing conditions can still be triggered, thereby improving the robustness of the sealing judgment. When the sealing conditions are met, the sealing command is output to drive the physical sealing actuator to implement the construction sealing. Combined with the sealing status feedback device, a sealing status confirmation link is formed, making the sealing disposal a verifiable closed loop. At the same time, the construction process control module outputs process control signals to keep the preset dangerous processes under control and restriction, thereby improving the safety controllability and disposal reliability of the construction process of the adjacent existing pipeline pit. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 The block diagram of the sealing and control linkage system provided by the present invention;

[0039] Figure 2 This is a schematic diagram of the measurement cross-section arrangement provided by the present invention;

[0040] Figure 3 A schematic diagram of the three-dimensional arrangement and net distance measuring points of the pile-pile crossbeam and existing municipal pipelines provided by the present invention;

[0041] Figure 4 The flowchart for the feedback processing of sealing in place provided by this invention;

[0042] Figure 5 The flowchart of the net distance monitoring and control trigger determination method provided by the present invention;

[0043] Figure 6 The flowchart for the sealing execution and on-time feedback processing provided by this invention;

[0044] Figure 7The flowchart of the unsealing determination method provided by the present invention.

[0045] Explanation of reference numerals in the attached figures:

[0046] 11-Outer row of piles; 12-Inner row of piles; 13-Pile beam; 20-Existing municipal pipeline; 31-Mid-span measurement section; 32-Side measurement sections; 41-First net distance measuring point; 42-Second net distance measuring point. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0049] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0050] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0051] In one possible implementation, the municipal road excavation pit pipeline clearance monitoring and control system is arranged in the relatively adjacent area between the excavation pit support components and the existing municipal pipeline 20. The system includes clearance measurement components, an edge gateway controller, a physical control actuator, a control positioning feedback device, and a construction procedure control module, such as... Figure 1 As shown. The clearance measurement component is used to collect clearance data between the foundation pit support components and the existing municipal pipeline 20 and form a timestamped measurement sequence; the edge gateway controller communicates with the clearance measurement component and is used to perform edge-side fusion calculation on the clearance data of multiple sections and multiple measurement points to obtain the global minimum clearance, clearance approximation rate and global reliability index, and outputs a lockdown command when the lockdown conditions are met; the physical lockdown actuator is used to respond to the lockdown command to implement construction lockdown; the lockdown status feedback device is used to detect the lockdown status of the physical lockdown actuator and feed it back to the edge gateway controller to form a closed-loop confirmation. The relevant status confirmation and timeout handling process is as follows: Figure 4 As shown, the construction process control module is used to respond to the lockdown command and output process control signals to the operation equipment control loop and / or access control device, so that the preset dangerous process is in a state of prohibition from starting and / or prohibition from passing, thereby transferring risk management from monitoring and judgment to a closed-loop lockdown link that can be automatically executed and accepted. The sampling period of the clearance measurement component can preferably be 0.1s to 10s, and the timestamp can be generated by the edge gateway controller for unified time synchronization or generated by the sensor and clock synchronized and corrected on the gateway side, so that the difference between adjacent sampling times has a clear engineering source to support subsequent rate calculation.

[0052] In the above embodiment, to cover the most unfavorable clearance position along the axial direction of the existing pipeline, at least three measuring sections are set along the axial direction of the existing municipal pipeline 20, and each measuring section is equipped with at least a first clearance measuring point 41 and a second clearance measuring point 42. For example... Figure 2 and Figure 3As shown, for common support components including double-row piles and inter-pile beams 13 set between the two rows of piles, and where existing municipal pipelines 20 are located below the inter-pile beams 13, the measurement sections can preferably be arranged as a mid-span section and two sections near the pile-beam connection node. This allows the section locations to simultaneously cover the relative approximation caused by the mid-span deflection of the beam, as well as the local relative displacements that may be caused by sudden changes in stiffness and concentrated rotation in the node constraint area. The number of sections should be no less than three, enabling the monitoring coverage to simultaneously capture typical distributions such as the maximum mid-span deflection and the concentration of local relative displacements near the constraint, reducing the probability of missing the most unfavorable location due to relying solely on a single section. Each cross-section is equipped with no fewer than two measuring points to cover the relative attitude changes that the support components and pipeline may undergo under construction disturbances, including deflection, torsion, and non-uniform approximation caused by local bulges, local settlement, or additional loads. The edge gateway controller uses the minimum net distance between the two measuring points within the cross-section to represent the risk level of that cross-section, thus characterizing the cross-section risk by the most unfavorable measuring point and avoiding underreporting caused by a single measuring point falling exactly in a non-most unfavorable attitude direction. As an example of the arrangement of two measuring points, the first net distance measuring point 41 and the second net distance measuring point 42 can be symmetrically set on the left and right sides of the same cross-section relative to the pipeline centerline, or respectively corresponding to the two sides of the lower edge of the crossbeam and the different stress lines of the support components. The lateral spacing between the two measuring points within the cross-section can be set within the range of 0.5D to 2.0D of the pipeline outer diameter D, or within the range of 0.2m to 1.0m to balance coverage of torsional attitudes and on-site installation feasibility, and to make the measuring directions of the two measuring points point to the same pipeline side reference area as much as possible to reduce systematic errors caused by geometric differences. To make the cross-section location more feasible for engineering implementation, when the span of the beam is L, the cross-section can be arranged at the midpoint of L, and the cross-sections on both sides of the node can be arranged at a distance of 0.1L to 0.3L from the corresponding node, or at a distance of 0.5 to 2.0m from the node according to the site conditions. When the axial coverage of the pipeline is long, the cross-section spacing along the pipeline axis can preferably be 1 to 5m, and the cross-sections can be denser at joints, diameter changes, bends or abrupt changes in strata.

[0053] In the above embodiments, the clearance measurement component outputs clearance data using a non-contact ranging method. Depending on the on-site dust, mud, water mist, and obstruction conditions, one or a combination of laser TOF ranging, phase-type laser ranging, ultrasonic ranging, or millimeter-wave radar ranging can be selected. To improve the repeatability, resistance to construction pollution, and resistance to angular deviation in clearance measurement, the clearance measurement component preferably includes a support member-side mounting base, a clearance sensor, a pipeline-side reference component, a direction-finding structure, a protective structure, and a detachable connection structure. The mounting base on the support component side is fixed to the foundation pit support component and provides adjustable posture, enabling the measurement axis of the clearance sensor to be aligned with the pipeline-side reference component. The clearance sensor is connected to the mounting base via a detachable connection structure for maintenance and verification during the construction phase. The pipeline-side reference component is non-destructively fixed to the outer wall of the existing municipal pipeline 20 using clamps. The clamps may include metal strips and elastic pads to reduce damage to the pipeline's anti-corrosion layer and improve clamping stability. The pipeline-side reference component preferably includes a planar reference target plate, which provides a reproducible distance measurement reference surface for the clearance sensor, making the clearance output independent of the pipeline surface roughness and random attachment morphology, thereby improving consistency across cycles and maintenance conditions. To reduce false echoes caused by mud adhesion, a mud-adhesion-resistant frame and / or mud-scraping structure can be installed on the outer side of the planar reference target plate. The protective structure shields and guides the clearance sensor. If necessary, a purging system can be installed to form an air curtain to reduce dust and mud contamination of the measurement surface. The direction-finding limiting structure uses positioning and locking components to lock the measurement direction of the clearance sensor to a preset direction pointing towards the plane reference target plate, making it less prone to angular drift caused by construction vibrations, loading, unloading, and maintenance. During on-site calibration, the echo quality can be adjusted to meet the calibration conditions, and the calibration timestamp is recorded. Subsequent reliability assessments use the calibration timestamp to determine the calibration validity period, thus forming a traceable measurement reference link. Echo quality indicators can be implemented in the clearance sensor output fields as echo intensity I, signal-to-noise ratio (SNR), and effective echo percentage R. valid At least one of the following, the edge gateway controller can set threshold logic to determine whether the echo quality meets the calibration conditions, for example, when I≥I0 and SNR≥SNR0 and R valid When R0 ≥ 0, the echo quality is considered to meet the calibration conditions, and the writing of calibration parameters is allowed. During calibration, in addition to recording the calibration timestamp, I, SNR, and R are also recorded. valid and the corresponding original distance measurement value d raw，cal (i, j) are used to identify measurement distortions caused by mud contamination, skew drift, or echo degradation in subsequent reliability assessments. During operation, the edge gateway controller continuously collects I, SNR, and R... validAs an operational quality indicator, the operational quality indicator is used both for reliability deduction and for abrupt change assistance, ensuring that the calibration field and the operational discrimination field are logically consistent within the system. To ensure that the net distance data has executable engineering meaning, the raw distance value output by the net distance measurement component is denoted as d. raw The conversion of the net distance between the support component and the existing municipal pipeline 20 (i, j, t) can be defined as d(i, j, t) = d raw (i,j,t)-b(i,j,t), where the bias term b(i,j,t) preferably consists of a fixed bias b0(i,j) and an optional correction term Δb(i,j,t). The fixed bias b0(i,j) is determined by the mounting geometry, the thickness of the mounting base structure, and the difference between the ranging reference point, and can be obtained during calibration using a known standard distance. The optional correction term Δb(i,j,t) is used to characterize the effects of slow changes such as temperature drift or slight attitude variations. Δb(i,j,t) can be obtained through periodic calibration, temperature compensation, or sensor self-diagnosis and is used to improve long-term operational consistency. The minus sign is indicated by d. raw Under the premise that a larger value indicates a larger clearance, the same clearance conversion can also be achieved by adding or subtracting offsets under other reference definitions.

[0054] In the above implementation, the edge gateway controller establishes a net distance data structure using cross-sections and measurement points as indexes, and its fusion calculation and control determination process is as follows: Figure 5 As shown. The cross-section index is i, the measurement point index is j, where the first net distance measurement point 41 corresponds to j=1, the second net distance measurement point 42 corresponds to j=2, the sampling time is t, and the net distance measurement value is d(i, j, t). The edge gateway controller acquires the net distance data of at least three measurement cross-sections at each sampling time, and for each measurement cross-section, it takes the minimum value of the net distance data of the first net distance measurement point 41 and the second net distance measurement point 42 to obtain the minimum net distance d of the cross-section. s (i, t) = min{d(i, 1, t), d(i, 2, t)}, and then the minimum net distance between each measurement section is taken as the minimum value to obtain the global minimum net distance D. min (t) = min i ds(i,t). At adjacent sampling times t k-1 With t k Between these points, the edge gateway controller calculates the net approach rate, which is defined as v. raw (t) k )={D min t k-1 -D min (t) k )} / (t k -t k-1 The unit of the main embodiment is specified as mm / min, and can be selected as mm / s.

[0055] In one alternative implementation, the nonnegative approximation rate v(t) can be further calculated. k =max(0, v) raw (t) k This is used for display, statistics, or risk assessment. The lockdown rate threshold is determined based on v. raw (t) k ) and the lockdown rate threshold V c Comparison is performed. Considering that communication jitter or sampling asynchrony may exist at different measurement points, the edge gateway controller can perform time alignment processing on the data of each measurement point. For example, it can select the nearest neighbor sample within a preset alignment window as d(i,j,t). k Alternatively, if the upper limit condition for interpolation is met, linear interpolation can be used to fill in the gaps, and the interpolation usage can be included in the confidence deduction factor. An example of setting the upper limit condition for interpolation is that the number of missing test points within the alignment window does not exceed a preset number N0 and the duration of consecutive missing test points does not exceed T. 0’ If the above interpolation upper limit condition is not met, the alignment is deemed to have failed and is treated as a missing test. When used to form D... min (t) k When the key measurement points fail to align within the alignment window, the corresponding d(i,j,t) will be... k This is recorded as a missing test and its reliability is reduced according to the missing test rules, and the D at this sampling time is... min (t) k The previous valid value can be retained or marked as invalid to avoid distortion in rate calculation; when D min (t) k When a ) is marked as invalid, v can be synchronously set to invalid. raw (t) k () Marked as invalid or not involved in the blocking rate threshold determination. To suppress the impact of glitches on rate calculation, the edge gateway controller can... min (t) Median filtering or moving average is performed to obtain a smoothed sequence for rate calculation and threshold determination. Simultaneously, abrupt change identification is preferentially performed on the original measurement point sequence or the minimum sequence of the cross-section, ensuring that filtering and anomaly criteria are logically compatible and do not mask each other. The threshold parameters I0, SNR0, R0, J0, N0, and T are... 0’ The system allows for the setting of preset parameters, which can be determined by the construction stage, sensor accuracy, and on-site environmental conditions, or updated via a backend system.

[0056] In the above implementation, the edge gateway controller performs a reliability assessment based on the missing measurements, jumps, drifts, and calibration validity period of the net distance data, and obtains a global reliability index C(t). The numerical domain of C(t) is defined as the closed interval [0, 1], with a larger value indicating higher reliability. For ease of review and project acceptance, the reliability of a single measurement point is expressed using a deduction-based rule as c(i, j, t) = clip(1-P). miss -P jump -P drift-P cal (0, 1), where clip indicates truncating the result to the interval [0, 1], P miss P jump P drift P cal Deduction items corresponding to missing measurements, jumps, drift, and calibration validity period are defined as engineering configurable functions and triggered by thresholds or proportions; when there are missing measurements or consecutive missing measurements within the alignment window, P miss A larger value is used to quickly reduce confidence. When a jump or drift occurs, the score is deducted progressively according to the proportion of the abnormal amplitude to the threshold. When calibration expires, P... cal As the overdue period increases, it may be directly downgraded to mandatory unreliability. Drift assessment can calculate the mean or median net distance within a preset time window W and compare it with the previous window. The window W is, for example, 1 to 10 minutes, used to identify systematic deviations caused by loose installation, target surface contamination accumulation, or slow changes in sensor zero point. In defining the global reliability index, it is preferable to make the reliability consistent with the most unfavorable net distance point, letting (i * j * ) to generate D min If the cross-section of (t) and the measuring point are given, then C(t) = c(i) * j * The reliability threshold C is set at t, allowing the reliability of the data sourced from the weakest net distance to directly participate in the lockdown criterion and preventing the overall average reliability from masking anomalies at the weakest point. c As an example, a configurable parameter can be set within the range of 0.7 to 0.9 to implement a failover protection strategy when data is insufficient to prove safety (i.e., containment). Jump evaluation can be based on the aligned difference between adjacent samples |d(i,j,t). k )-d(i,j,t) k-1 | Compare with the jump threshold J0; Jump assessment can also introduce consistency and echo quality to assist in discrimination to reduce misjudgment. When a significant jump occurs at a certain measuring point while another measuring point on the same section changes steadily within the same time window, or when the echo intensity I, signal-to-noise ratio (SNR), or effective echo proportion R of the measuring point decreases when the jump occurs. valid If the value is below the threshold, the jump change is more likely to be caused by mud blockage, dust scattering, angle drift, or transient electromagnetic interference. The edge gateway controller controls P. jump Apply stronger penalties and mark the measurement point as an abnormal data source; when two measurement points show synchronous changes in the same direction and I, SNR, R valid If the conditions are met, the jump change may reflect the rapid change in the relative displacement of the actual structure. In this case, the impact on P can be reduced. jump The penalty intensity is determined and preventive blocking is triggered primarily by the approach rate threshold, thus making anomaly identification and real rapid approach warning logically distinguishable.

[0057] In the above implementation, the edge gateway controller outputs a blocking command when any blocking condition is met. The blocking conditions include the global minimum clearance not being greater than a preset blocking clearance threshold D. c Or net distance approximation rate v raw (t) k Not less than the preset containment rate threshold V c Or the global credibility index C(t) is lower than the preset credibility threshold C. c The net distance threshold for lockdown D c For example, the sealing rate threshold V can be set within the range of 20–200 mm. c The example setting is within the range of 0.5 to 10 mm / min. The specific configuration and adjustment can be based on the pipeline protection distance, design control parameters, and construction conditions. (V...) c A positive threshold is used to characterize the upper limit of the approach speed as the clearance decreases. The physical containment actuator implements on-site containment upon receiving the containment command. Its form may include a barrier gate, rising bollard, telescopic guardrail, gate, or electronic fence on the passage side, and safety relays, safety contactors, or safety PLC outputs on the equipment side, used to cut off or prohibit the start-up permission circuit of dangerous equipment. The construction process control module and the work equipment control circuit, and the passage control device can be interlocked through dry contacts, relay contacts, Modbus, or PLCI / O, and a power failure protection logic is used to ensure that the system defaults to a prohibited start and / or prohibited passage state in the event of a power failure or fault, thereby improving intrinsic safety. The containment positioning feedback device detects the positioning status of the containment actuator through limit switches, reed switches, Hall sensors, encoder positioning signals, photoelectric beams, or position sensors, and connects the positioning signal to the edge gateway controller. To ensure the acceptability of the containment closed loop, the edge gateway controller starts a positioning confirmation timer after issuing the containment command. When the preset positioning timeout T is reached... ack If no feedback is received that the lockdown is in place, the system determines that the lockdown is not in place and triggers a secondary response. This secondary response includes maintaining the continuous output of the lockdown command and escalating the process control signal to a more stringent mandatory prohibition state for all hazardous processes; triggering audible and visual alarms and reporting the fault event; outputting manual verification and troubleshooting prompts to the on-site management terminal; and, if necessary, simultaneously tightening the access-side lockdown and equipment-side interlocks. Tightening can be exemplified by switching the access-side lockdown from single-point interception to dual-point interception or adding redundant lockdown equipment and keeping it normally closed. Simultaneously, the equipment-side permission circuit can be switched to dual-channel disconnection of safety relays or the enabling links of multiple hazardous devices can be simultaneously disconnected to ensure that a safety-first failure protection state is maintained even in the event of actuator failure or feedback link anomaly. The edge gateway controller records the timestamp of the lockdown command issuance, the timestamp of the lockdown completion feedback, or the timestamp of the timeout event, and stores this information in association with key data such as the trigger reason code, global minimum clearance, clearance approach rate, and global reliability to support closed-loop lockdown acceptance and subsequent traceability.

[0058] By aggregating the minimum clearance across multiple cross-sections and measuring points, calculating the rate consistent with the clearance approximation rate definition, establishing quantifiable reliability deduction rules, and implementing a closed-loop interlocking mechanism for timeout and secondary handling of clearance control, this implementation method can achieve verifiable, automated clearance risk control with failure protection capabilities in a foundation pit construction environment where the relative attitude of the support components and existing pipelines changes, the most unfavorable local position is uncertain, and data quality fluctuations and actuator failures may occur.

[0059] In one possible implementation, the aforementioned municipal road foundation pit pipeline clearance monitoring and control system is applied to a foundation pit support structure formed by double rows of piles and inter-pile beams 13. The foundation pit support components include an inner row of piles 12 and an outer row of piles 11. The two rows of piles are parallel to each other in the plane, forming a distance between them. The inter-pile beams 13 span between the two rows of piles and connect to both the inner and outer rows of piles, thus forming a transversely stressed support component between the two rows of piles. The existing municipal pipeline 20 is laid along the road axis and located below the inter-pile beams 13. A safe clearance interval to be monitored is formed between the upper part of the pipeline and the lower edge of the inter-pile beams 13. This clearance varies with foundation pit excavation unloading, redistribution of stress in the support system, ground displacement, and construction disturbance.

[0060] In the above embodiments, to ensure consistent engineering meaning for clearance monitoring, the reference surface of the foundation pit support component can be determined as one of the following: the lower edge surface of the pile-to-pile crossbeam 13, the outer surface of the protective layer at the bottom of the crossbeam, or the installation reference surface set at the bottom of the crossbeam. This allows the clearance data output by the clearance measurement component to characterize the minimum gap change between the reference surface and the outer wall of the pipeline or the pipeline-side reference target surface. The clearance measurement component can be installed on the lower edge of the pile-to-pile crossbeam 13 or on a support component rigidly connected to the pile-to-pile crossbeam 13, with the clearance sensor pointing towards a reproducible reference surface in the area above the pipeline. This reduces the impact of beam deflection, node rotation, and directional drift caused by construction vibration on the clearance reading. The pipeline-side reference component can be non-destructively fixed to the outer wall of the existing municipal pipeline 20 to ensure the reference surface remains reproducible during repeated disassembly and recalibration, and to reduce the risk of damage to the pipeline's anti-corrosion layer or outer wall structure.

[0061] In the aforementioned structural scenario, the inter-pile beam 13, as a bending member spanning two rows of piles, may experience mid-span deflection and rotation near the pile-beam connection node during construction. When excavation causes lateral displacement of the double-row piles or downward deflection of the inter-pile beam 13, the net clearance data tends to decrease. When backfilling, counter-pressure, temporary support reinforcement, or process adjustments are implemented to cause the beam deflection to rebound or the ground displacement to converge, the net clearance data tends to stabilize or increase. By linking the net clearance change with the control execution link, the system can trigger control and achieve process interlocking when the risk of the pipeline net clearance below the inter-pile beam 13 approaching the control point is significant. This enables safe net clearance monitoring and control in the spatially superimposed scenario of double-row piles—inter-pile beam 13—existing pipeline.

[0062] In one possible implementation, in a scenario where a double-row pile and a crossbeam 13 form a support structure and the existing municipal pipeline 20 is located below the crossbeam 13, at least three measurement sections are arranged along the axial direction of the existing municipal pipeline 20, including at least one measurement section corresponding to the mid-span of the crossbeam 13 and two measurement sections near the pile-beam connection node on both sides. Specifically, the crossbeam 13 forms a bending member with a span of L between the two rows of piles. The mid-span region is usually the peak deflection region. Therefore, the mid-span measurement section 31 can be arranged at the midpoint of the span L of the crossbeam 13, and preferably at the corresponding position in the area of ​​sensitive clearance above the pipeline, so that the clearance collected by this section can characterize the most unfavorable impact of the beam deflection on the clearance above the pipeline.

[0063] In the above implementation, considering the abrupt change in structural stiffness, node rotation, and local shear effects at the pile-beam connection node, and the fact that the area near the node is more susceptible to stress redistribution of the support system, pile displacement transmission, and site disturbances during the construction phase, two measurement sections near the nodes are respectively arranged in the inner region of the beam span near the corresponding pile-beam connection node, so that they can reflect the influence of the relative displacement concentration near the node on the net distance. As an example of engineering layout, the measurement sections 32 on both sides of the node can be set at a distance of 0.1L to 0.3L from the node, or at a distance of 0.5 to 2.0m from the node when site conditions are limited. Preferably, the section is located directly above the net distance sensitive area above the pipeline, so that when mid-span deflection and local effects in the node area coexist, the typical net distance distribution pattern can still be covered by at least three sections.

[0064] In the above embodiments, when the existing municipal pipeline 20 passes through multiple spans of inter-pile beams 13 or multiple adjacent support units along its axial direction, at least three cross-section combinations of "span mid-section + cross-sections on both sides of the node" can be set for each span. Alternatively, additional cross-sections can be arranged at intervals of 1 to 5 meters along the pipeline axial direction based on the above three cross-sections. This enhances the ability to capture the most unfavorable local clearance when there are situations such as pipeline joints, diameter changes, bends, or sudden changes in geological conditions. By using the span mid-section and the cross-sections on both sides of the node as examples of at least three cross-sections, the risk location corresponding to the global minimum clearance can be identified more stably when the maximum deflection at the mid-span of the beam and the local relative displacement near the node occur simultaneously. This provides a more representative clearance data basis for subsequent closure determination.

[0065] In one possible implementation, after the physical containment executor has responded to the containment command and implemented the containment, and the containment status feedback device reports the containment status to the edge gateway controller, the edge gateway controller enters the unblocking determination mode, such as... Figure 7 As shown, in the unsealing judgment mode, the net distance data of each measurement section and each measuring point continues to be collected, and the global minimum net distance D is updated. min (t) k Net Approach Rate v raw (t) k ) and the global credibility index C(t) k This is used to determine whether the construction site meets the safety conditions for lifting the lockdown. To avoid frequent fluctuations in lockdown and reopening around the threshold, a hysteresis strategy is adopted for reopening determination, and the clearance threshold for reopening is set to D. release And D release >Dc, which means that the lockdown can only be lifted when the net distance recovers to a safe margin range above the lockdown threshold.

[0066] In the above implementation method, please refer to Figure 7 The edge gateway controller continuously determines the desealing conditions at each sampling time. The desealing conditions include at least the distance condition, the confidence condition, and the rate condition. The distance condition is D. min (t) k )≥D release And continuously meet the preset stable window duration T stable ;T stable Example settings can be set to 10 seconds to 10 minutes, and can be implemented using a sliding window, meaning that if D appears at any time within the window... min (t) <D release Then the stable timing resets. The confidence condition is C(t). k )≥C c This ensures that the unsealing is based on reliable data; when used to form Dmin(t) kThe key measurement points of ) may experience alignment failures, echo quality degradation, or calibration delays, leading to C(t) k When the rate drops, the edge gateway controller remains in a blocked state and continues data collection until the trust level recovers to meet the condition. The rate condition is v. raw (t) k ) <V release V release It can be set to a positive threshold that is less than the containment rate threshold V. c This is used to characterize that the net distance no longer decreases at a relatively rapid rate; when v raw (t) k When v is positive and large, it indicates that the net distance is still approaching, and unsealing is not allowed; when v raw (t) k A value of zero or negative indicates a stable or increasing net distance, but it still needs to be considered in conjunction with D. min (t) k ) and C(t) k The system can only be unblocked after the stability window requirements are met.

[0067] In the above implementation, the edge gateway controller can link the unblocking determination with the closed-loop state of the lockdown, that is, it will only start the unblocking stabilization timer when it has received feedback that the lockdown is in place and the lockdown status is confirmed to be valid. For D min (t) k ) or v raw (t) k If a sampling moment is marked as invalid, the unsealing determination for that sampling moment can be marked as invalid and the stabilization timer can be paused, or the stabilization timer can be reset (preferably reset) to prevent invalid data from being misused as the basis for unsealing. When the clearance condition, reliability condition, and rate condition are all met, the edge gateway controller outputs an unsealing command to release the construction lockdown and outputs a recovery signal to the construction process control module to restore the start permission and / or access permission of the preset dangerous process to the allowed state. At the same time, it can drive the physical lockdown actuator to perform evacuation, lifting, or opening actions and record the corresponding state changes to form a complete closed-loop link of lockdown-unsealing.

[0068] In the above implementation, to facilitate project management and traceability, the edge gateway controller can record the unblocking trigger time, the start and end time of the stable window, and D when outputting the unblocking command. min (t) Statistic, v raw The system stores the statistical value (t), C(t), and the unsealing reason code, and associates them with the trigger reason code of the previous sealing event and the sealing completion timestamp. When the net distance approaches again or the credibility decreases after the unsealing, the edge gateway controller can re-trigger the sealing according to the established sealing criteria, thereby maintaining a safety-first closed-loop control strategy under on-site conditions such as uncertain net distance recovery, repeated construction disturbances, or data quality fluctuations.

[0069] Please see Figure 2 , Figure 3 In one possible implementation, the clearance measurement component for monitoring the safety clearance between existing pipelines in a municipal road excavation pit is configured to output clearance data between the pit support structure and the existing municipal pipeline 20. The clearance measurement component includes a support structure-side mounting base, a clearance sensor, a pipeline-side reference element, a direction-finding structure, a protective structure, and a detachable connection structure.

[0070] The mounting base on the support component side is fixed to the preset installation position of the foundation pit support component, providing a mounting base and force support for the clearance sensor. This ensures that the clearance sensor maintains a relatively stable installation posture and measurement direction even under conditions such as construction vibration, support component deformation, and the influence of on-site mud and dust. The clearance sensor, mounted on the support component side mounting base, performs non-contact distance measurement and outputs a clearance signal. The clearance signal includes at least a distance output characterizing the measurement result. The system can generate corresponding clearance data based on the clearance signal to reflect the relative gap change between the support component and the existing municipal pipeline 20. In some embodiments, the clearance sensor can be implemented using laser ranging, ultrasonic ranging, or millimeter-wave ranging to adapt to different construction environments and installation space conditions, but is not limited to these.

[0071] The pipe-side reference component is used to non-destructively fix the existing municipal pipeline 20 to its outer wall using clamps. The pipe-side reference component includes a planar reference target plate, which is positioned facing the clearance sensor and serves as the distance measurement target surface for the sensor. Since the outer wall of the existing municipal pipeline 20 is typically curved and may have anti-corrosion layers, attachments, or local unevenness, directly using the curved surface of the pipeline as the distance measurement target can easily lead to changes in incident conditions, enhanced scattering, or unstable echoes, resulting in unstable or unreproducible distance measurement references. By setting a planar reference target plate, a reproducible distance measurement reference surface can be provided for the clearance sensor, ensuring that the distance measurement component maintains consistency in distance measurement reference even during repeated disassembly and reassembly or changes in operating conditions. This allows the distance measurement data output by the component to stably characterize the change in clearance between the pit support structure and the existing municipal pipeline 20. To further ensure that the net distance data has a consistent engineering meaning, the system can be calibrated and the calibration parameters recorded during the installation or maintenance phase, so as to establish a traceable correspondence between the distance measurement output and the reference surface of the foundation pit support component and the reference surface of the plane reference target plate. However, the calibration method does not constitute a limitation on the structure of this component.

[0072] The direction-finding limiting structure is used to limit the measurement direction of the clearance sensor to the plane reference target plate, ensuring that the measurement axis of the clearance sensor remains aligned with the plane reference target plate after installation. This reduces ranging errors caused by measurement direction deviation and improves ranging repeatability and consistency. The protective structure protects the clearance sensor from damage caused by mud splashes, gravel impacts, dust accumulation, and construction collisions in the construction environment, while providing an effective propagation path for non-contact ranging. The detachable connection structure enables a detachable connection between the clearance sensor and the mounting base on the support component. This allows the clearance sensor to be removed from the mounting base for calibration, maintenance, or replacement, and to continue measuring the plane reference target plate after reinstallation, meeting the needs of on-site maintenance and reuse.

[0073] Through the fixed support of the mounting base on the support component side, the non-contact distance measurement of the clearance sensor, the non-destructive fixing of the pipe side reference component with clamps and the reproducible distance measurement reference surface provided by the plane reference target plate, the constraint of the measurement direction by the direction-finding structure, the protection of the sensor by the protective structure, and the maintainability brought by the detachable connection structure, the clearance measurement component can output clearance data to characterize the clearance change between the foundation pit support component and the existing municipal pipeline 20.

[0074] In some implementations, the pipe-side reference component is non-destructively fixed to the outer wall of the existing municipal pipeline 20 using a clamp. The clamp includes a metal strip and an elastic gasket. The metal strip provides circumferential clamping force and reliably limits the positioning of the pipe-side reference component. The metal strip can be made of stainless steel or galvanized steel to balance corrosion resistance and structural strength. The metal strip can be tensioned using bolt locking, hook-and-loop locking, or worm gear clamp locking, ensuring the clamp maintains stable clamping force under construction vibration, cement slurry erosion, and humid and hot environments. The elastic gasket is placed between the metal strip and the outer wall of the pipeline to conform to the curved surface of the pipeline and disperse contact pressure, thereby reducing the risk of point pressure damage to the pipeline's anti-corrosion layer and increasing friction to inhibit circumferential slippage or rotation. The elastic gasket can be made of materials such as rubber, EPDM, silicone, or polyurethane elastomer, and its appropriate thickness and hardness can be selected according to the pipe diameter and the vibration level at site, ensuring the clamp provides sufficient restraint while avoiding irreversible damage to the outer wall of the pipeline.

[0075] In some implementations, to further suppress circumferential slippage or rotation under construction vibration and scouring conditions, the surface of the elastic pad may be provided with anti-slip texture or anti-slip particle layer, and / or the pipe side reference component may be provided with at least one of circumferential limiting boss, anti-rotation positioning block or anti-rotation step; or double clamps may be arranged at intervals to form a double-point circumferential constraint to improve the posture stability and fixing reliability of the pipe side reference component on the outer wall of the pipe.

[0076] In the above embodiment, the pipeline-side reference component includes a planar reference target plate, which is positioned facing the distance sensor and serves as the distance measurement target surface for the distance sensor. At least one of a mud-adhesion-resistant frame and a mud-scraping structure is provided on the outer side of the planar reference target plate to reduce the impact of mud coverage and dust fouling on echo quality and distance measurement stability. The frame can form a convex retaining edge or perimeter structure around the perimeter of the planar reference target plate, creating a relatively independent protected area on the target plate surface, thereby preventing mud from spreading extensively along the target plate surface. The height and width of the frame can be selected according to the target plate size and the viscosity of the construction mud, improving the anti-adhesion effect without obstructing the effective distance measurement area.

[0077] The mud-scraping structure can be positioned on the front side of the target plate or near its surface. It is used to scrape and clean the target plate surface during maintenance or routine inspections, restoring its effective exposure as a ranging reference surface. The mud-scraping structure can be implemented using flexible blades, strips, or scrapers with elastic pre-tension, allowing it to adapt to minor unevenness and variations in the thickness of the adhesion layer on the target plate surface, and reducing the risk of scratching the surface. In some embodiments, the mud-scraping structure can be arranged in conjunction with a protective cover or flow guide component, making it easier for mud to be carried away and reducing continuous deposition on the target plate surface, thereby increasing the proportion of usable data and reducing the probability of ranging drift. In some embodiments, the maintenance trigger condition can be based on the echo quality index or ranging effectiveness rate: when the echo quality index is lower than a preset threshold or the effective ranging rate is lower than a preset rate, mud-scraping cleaning is performed to restore the target plate's exposure.

[0078] The clamps formed by the aforementioned metal strips and elastic pads achieve non-destructive and stable fixation of the pipeline side reference components. The anti-slip / anti-rotation structure suppresses circumferential slippage or rotation. At the same time, the frame and / or mud scraping structure on the outside of the planar reference target plate suppress mud adhesion and pollution accumulation. This enables the planar reference target plate to maintain a more stable and reproducible distance measurement reference surface state in complex construction environments, thereby improving the stability and repeatability of the distance measurement component's output distance data.

[0079] In one possible implementation, the method for monitoring and controlling the safety clearance between existing pipelines in municipal road foundation pits is used to continuously monitor the relative clearance between the foundation pit support components and the existing municipal pipeline 20 during foundation pit construction. When the control trigger conditions are met, construction control and process interlocking are automatically implemented. When the unsealing conditions are met, the control is automatically lifted and the pre-set start-up and / or passage permissions for hazardous processes are restored. This method can be executed by an edge gateway controller, which is communicatively connected to the clearance measurement components, physical control actuators, control arrival feedback devices, and construction process control modules deployed on-site to achieve closed-loop control of monitoring, judgment, execution, and feedback.

[0080] In some implementations, the method operates as a state machine, including at least a construction-allowed state, a lockdown-awaited state, a lockdown-maintained state, and a lockdown-determination state. In the construction-allowed state, clearance data is continuously collected and lockdown triggering conditions are evaluated. When a lockdown event is triggered, the method enters the lockdown-awaited state and outputs a lockdown command. Upon receiving lockdown-in-place feedback, the method enters the lockdown-maintained state and continuously prohibits the initiation and / or passage of preset hazardous procedures. In the lockdown-maintained state, the lockdown-determination conditions are continuously determined; when the conditions are met, the lockdown is deactivated and the method returns to the construction-allowed state. Through these state machine constraints, repeated lockdown and de-lockdown jitter caused by relying solely on single sampling results can be avoided, and the lockdown execution and process interlocking remain effective during the lockdown state. The lockdown triggering determination logic is described in [reference needed]. Figure 5 For feedback on the implementation of lockdown measures and the process of maintaining lockdown status, please refer to [link / reference]. Figure 6 For the logic of determining whether to lift the lockdown, please refer to [link / reference]. Figure 7 .

[0081] In the above embodiments, the method includes the following steps.

[0082] S1) At least three measurement sections are set along the axial direction of the existing municipal pipeline 20. At least a first net distance measuring point 41 and a second net distance measuring point 42 are set at each measurement section. The measurement sections are distributed along the pipeline axial direction to cover different spatial locations where the relative displacement between the pipeline and the support components may occur. Each section has at least two measuring points to cover the differences in net distance distribution caused by changes in the relative attitude of the support components and the pipeline, so that the risk of the section can be characterized by the minimum net distance within that section. The section index is denoted as i, and the measuring point index is denoted as j, where the first net distance measuring point 41 corresponds to j=1, and the second net distance measuring point 42 corresponds to j=2. The sampling sequence is incremented by the sampling number k, and the sampling timestamp corresponding to each sampling number k is denoted as T(k).

[0083] S2) Collect at least the net distance data of the first net distance measuring point 41 in each measurement section as the first net distance value, and collect the net distance data of the second net distance measuring point 42 in each measurement section as the second net distance value, and record the calibration timestamp T. cal For any cross-section i, the net distance measurement value obtained at sampling number k is denoted as d(i, j, k), where d(i, 1, k) is the first net distance value and d(i, 2, k) is the second net distance value. Calibration timestamp T cal The calibration parameters used to obtain the net distance data are bound to the storage and used for subsequent determination of the calibration validity period. In some implementations, the sampling timestamp T(k) is generated based on the unified time synchronization of the edge gateway controller, or the timestamp is reported by the sensor and clock correction and alignment are performed on the edge gateway controller side to reduce the impact of multi-point clock drift on the accuracy of rate calculation and time alignment.

[0084] S3) For each measurement section, the minimum value between the first and second net distance values ​​is taken as the minimum net distance of the section, and the minimum net distance of each measurement section is taken as the global minimum net distance. Specifically, the minimum net distance of the section is defined as ds(i,k) = min(d(i,1,k),d(i,2,k)); the global minimum net distance is defined as D min (k) = Minimize ds(i,k) for all cross section indices i.

[0085] When sampling asynchrony, communication jitter, or network latency causes measurement point data to fail to align within the same sampling number k, time alignment processing can be performed on the measurement point data. For example, the nearest neighbor sample can be used as d(i,j,k) within a preset alignment window, or linear interpolation can be used to fill in the gaps if the upper limit condition for interpolation is met. The upper limit condition for interpolation can be set as follows: the number of missing measurement points within the alignment window does not exceed a preset number N0 and the duration of continuous missing measurement does not exceed T0; if the upper limit condition for interpolation is not met, the alignment is judged as failed and treated as a missing measurement. To avoid misjudgment caused by missing measurement, when used to form D min When the key measurement point of (k) fails to align within the alignment window, the corresponding d(i,j,k) is recorded as a missing measurement and the confidence level is reduced according to the missing measurement rule, and the D of the sampling number k is also reduced. min (k) The previous valid value can be retained or marked as invalid to avoid distortion of the rate calculation; when D min When (k) is marked as invalid, the subsequently calculated v can be synchronously... raw (k) is marked as invalid or not involved in the lockdown rate threshold determination.

[0086] S4) Calculate the net distance approximation rate, which is the global minimum net distance at the previous sampling time minus the global minimum net distance at the next sampling time, divided by the time difference between adjacent sampling times. Specifically, the net distance approximation rate is defined as v raw (k) = {D min (k-1)-D min (k)} / (T(k)-T(k-1)), and it is agreed that the unit of the main embodiment is millimeters per minute, which can be selected as millimeters per second. The non-negative approximation rate v(k)=max(0, v raw (k) is used for display, statistics, or risk assessment. When D min (k) or D min When (k-1) is marked as invalid, v raw (k) is marked as invalid or not involved in the lockdown rate threshold determination.

[0087] S5) Based on at least one of the following factors in the net distance data: missing measurements, jumps, drift, and calibration validity period, a reliability assessment is performed to obtain a global reliability index. For ease of engineering implementation, the reliability index C(k) is defined as ranging from 0 to 1, with a larger value indicating higher reliability. The reliability of a single measurement point can be expressed using a deduction-type rule as c(i,j,k) = 1 - P. miss -P jump -P drift -P cal The results are limited to the range of 0 to 1, where P miss P jump P drift P cal These are deduction items corresponding to missing measurements, jumps, drift, and calibration validity periods, and are defined as configurable functions triggered by thresholds or proportions. The global reliability index can be optimally selected to generate D. min (k)'s most unfavorable measuring point (i) * j * The credibility of ), i.e., C(k) = c(i) * j * (k), so that the credibility of the weakest net distance source data can be directly involved in the decision on lockdown.

[0088] Missed test assessment can be based on a comparison between the duration of consecutive missed tests and a missed test threshold. When the duration of consecutive missed tests exceeds the missed test threshold, P is increased. miss Jump assessment can be based on comparing the absolute value of the difference between adjacent samples after alignment with the jump threshold J0, where the absolute value of the difference between adjacent samples is |d(i,j,k)-d(i,j,k-1)|; and can be combined with echo quality indicators or the consistency of two measurement points within the cross-section for auxiliary judgment. Drift assessment can calculate the net distance mean or median within a preset time window W and compare it with the previous window. When the change in mean exceeds the drift threshold, P is increased. drift The calibration validity period can be assessed based on the current sampling timestamp T(k) and the calibration timestamp T. cal The time interval is used to determine the validity period; if it exceeds the calibration validity period threshold, P is increased. cal This could reduce the credibility to unreliable. The threshold parameters J0, N0, T0, and the aforementioned thresholds are all configurable preset parameters, which can be set by the construction stage, sensor accuracy, and on-site environmental conditions, or updated by the backend.

[0089] In some implementations, the confidence index C(k) is related to the approximation rate v. raw The threshold determination of (k) is subject to coupling constraints: when C(k) is lower than the preset confidence threshold C c or v raw(k) When marked as invalid, the edge gateway controller suspends rate threshold determination or marks the rate determination result as invalid, and prioritizes the use of reliability-triggered failure protection logic to enter the blocking state in order to avoid erroneous rate triggering or erroneous unblocking caused by low-reliability data.

[0090] S6) A lockdown trigger event is generated when any of the following conditions are met: global minimum clearance D min (k) Not greater than the preset net distance threshold D for lockdown c Or net distance approximation rate v raw (k) Not less than the preset containment rate threshold V c Or the global credibility index C(k) is lower than the preset credibility threshold C c The net distance threshold for lockdown D c An example can be set to a containment rate threshold V within the range of 20 to 200 mm. c A sample setting could be set to a confidence threshold C within the range of 0.5 to 10 millimeter per minute. c Examples can be set within the range of 0.7 to 0.9, and the above thresholds are configurable and can be adjusted according to the construction stage or operating conditions. When the data is insufficient to prove safety, a lockdown is triggered through the confidence threshold to achieve failover protection.

[0091] S7) Responding to the lockdown trigger event, the system drives the physical lockdown actuator to implement construction lockdown, collects lockdown status feedback to determine whether the lockdown is in place, and simultaneously outputs process control signals to the work equipment control circuit and / or access control device, so that the preset dangerous process is in a state of prohibition from starting and / or prohibition from passing. The physical lockdown actuator may include a barrier gate, rising bollard, telescopic guardrail or gate on the access side, and a safety relay, safety contactor or safety PLC output on the equipment side, used to cut off or prohibit the start permission circuit of dangerous equipment; the process control signal can be implemented through at least one of dry contact, relay contact, Modbus or PLC input / output methods, and adopts power failure protection logic so that the system defaults to a state of prohibition from starting and / or prohibition from passing when power is lost or a fault occurs.

[0092] The sealing-in feedback device can use limit switches, reed switches, photoelectric sensors, or position sensors to detect the sealing status. After issuing the sealing action, the edge gateway controller starts a sealing-in confirmation timer. When the preset sealing-in timeout T is reached... ack If no feedback is received that the lockdown is in place, the lockdown is deemed incomplete and a Level 2 response is triggered. The Level 2 response includes maintaining the lockdown output and upgrading the process interlock to a more stringent state of mandatory prohibition of all hazardous processes, triggering audible and visual alarms and reporting fault events, prompting manual verification and troubleshooting, and, if necessary, simultaneously tightening the lockdown on the passage side and the interlock on the equipment side.

[0093] S8) After receiving feedback that the lockdown is in place, continue to collect net distance data and determine whether the lockdown is lifted. When the global minimum net distance Dmin (k) Not less than the preset unsealing net distance threshold D release And continuously meet the preset stable window duration T stable And the global credibility index C(k) is not lower than the credibility threshold C c And the net distance approximation rate v raw (k) Below the preset unsealing rate threshold V release The system will then unblock and restore the pre-defined permissions for starting and / or accessing hazardous procedures, where D... release Greater than D c Stable window duration T stable Examples can be set to 10 seconds to 10 minutes, and can be implemented using a sliding window; V release It can be set to a positive threshold and less than V c This is used to characterize that the net distance no longer decreases at a relatively rapid rate. For D min (k) or v raw (k) If a sampling number is marked as invalid, the unsealing determination of the sampling number can be marked as invalid and the stabilization timer can be paused or the stabilization timer can be reset to avoid invalid data being misused as the basis for unsealing.

[0094] During the unsealing process, the edge gateway controller outputs an unsealing command and drives the physical sealing actuator to perform evacuation, lifting, or opening actions. Simultaneously, it outputs a recovery signal to the construction process control module to restore the preset hazardous process's start and / or access permissions, and records the unsealing trigger time, the start and end times of the stabilization window, and the D values ​​related to the unsealing determination. min (k) Statistics within the stable window, v raw (k) Statistical value within the stable window and C(k) Statistical value within the stable window for traceability; wherein the statistical value includes at least one of the maximum, minimum, mean and / or median within the stable window.

[0095] Using the above methods, based on multi-section and multi-point net distance monitoring, the control trigger can be realized based on the global minimum net distance, net distance approach rate and reliability index. Closed-loop control is formed through physical control actuators, position feedback and process interlocking, so as to achieve safety-first net distance monitoring and control under the conditions of foundation pit construction disturbance and data quality fluctuation.

[0096] Please see Figure 2 , Figure 3In one possible implementation, when implementing the method for monitoring and controlling the safety clearance of existing pipelines in municipal road foundation pits, at least three measurement sections are set along the axial direction of the existing municipal pipeline 20, including at least one measurement section in the middle of the span of the corresponding pile-beam 13 and two measurement sections on both sides near the pile-beam connection node. This allows the clearance monitoring to simultaneously cover the deflection effect at the middle of the beam span and the local relative displacement effect near the node. At least a first clearance measuring point 41 and a second clearance measuring point 42 can be set in each measurement section to obtain the minimum clearance of the section and participate in the determination of the global minimum clearance.

[0097] In the above embodiment, the inter-pile beam 13 is spanned between the two rows of piles and forms a bending member with a span length of L. The mid-span region typically corresponds to the peak deflection or the region with the most unfavorable change in net clearance. Therefore, the mid-span measurement section 31 can be arranged at the midpoint of the beam's span, or at a position near the midpoint corresponding to the net clearance sensitive area above the existing municipal pipeline 20, so that the net clearance data collected at this section can characterize the most unfavorable impact of beam deflection or stress redistribution of the support system on the net clearance above the pipeline.

[0098] In the above implementation, the pile-beam connection node experiences abrupt changes in structural stiffness, variations in constraint boundary conditions, and potential node rotation and local shear effects. Simultaneously, during the construction phase, the area near the node is more susceptible to lateral displacement transmission from the pile, changes in the constraints at the beam ends, and site disturbances, leading to localized relative displacement concentration between the support components and the pipeline near the node. Therefore, two measurement sections are arranged near the nodes on both sides, respectively, within the beam span, between the corresponding pile-beam connection node and the beam mid-span, close to the node, to reflect the impact of relative displacement concentration near the node on the net distance.

[0099] In some implementations, to make the engineering location of the measurement sections clearer, the measurement sections 32 on both sides of the node can be set at a distance of 0.1L to 0.3L from the node, where the distance is measured along the span of the crossbeam; or, when site conditions are limited, they can be set at a distance of 0.5m to 2.0m from the node. The relative spacing of the mid-span measurement section 31 and the measurement sections 32 on both sides of the node along the pipeline axis can be determined in combination with the pipeline direction, crossbeam arrangement, and available installation space on site. Preferably, each measurement section is located at the corresponding position of the net clearance sensitive area above the pipeline to improve the representativeness of the global minimum net clearance to the actual risk location.

[0100] In some implementations, when an existing municipal pipeline 20 passes through multiple spans of inter-pile beams 13 or multiple adjacent support units along its axial direction, at least three measurement sections can be combined for each span, consisting of "mid-span measurement section 31 plus measurement sections 32 on both sides of the node"; or, based on the above three measurement sections, additional measurement sections can be arranged at intervals of 1m to 5m along the pipeline axis to enhance the ability to capture the most unfavorable local clearance when there are pipeline joints, diameter changes, bends, or sudden changes in geological conditions.

[0101] By using the mid-span measurement section 31 and the two side measurement sections 32 of the node as an example configuration of at least three measurement sections, it is possible to more stably identify the risk location corresponding to the global minimum clearance when the maximum deflection at the mid-span of the beam and the local relative displacement near the node occur simultaneously, and to provide a more representative clearance data basis for subsequent closure determination.

[0102] Please see Figure 5 In one possible implementation, when implementing the method for monitoring and controlling the safety clearance of existing pipelines in municipal road foundation pits, the reliability assessment includes at least one of the following: a continuous absence of measurement exceeding the absence threshold reduces the global reliability index; a difference in clearance between adjacent samples exceeding the jump threshold reduces the global reliability index; a drift in the mean clearance within a preset time window exceeding the drift threshold reduces the global reliability index; and a time interval between the current sampling time and the calibration timestamp exceeding the calibration validity period reduces the global reliability index. To ensure that the reliability assessment has an engineering-implementable basis, the global reliability index can be defined as C(k), with a numerical range of [0, 1], where a larger value indicates more reliable clearance data. Furthermore, C(k) can be optimized to reflect the reliability of the key measurement point that generates the global minimum clearance, so that the reliability of the weakest clearance source data can directly enter the control judgment logic.

[0103] In the above implementation, continuous missing measurement assessment is used to characterize the completeness of net distance data in the time dimension. For net distance measurement value d(i,j,k) with section index i and measurement point index j, when a valid value cannot be obtained within a continuous interval of the sampling number or is marked as missing, the continuous missing measurement duration T is calculated. miss (i, j, k). When T miss When (i, j, k) is greater than the preset missing measurement threshold T0, the deduction item P for the single measurement point corresponding to sampling number k is... miss This increases, thereby reducing the confidence level of individual measurement points and lowering the global confidence index C(k). In some implementations, P miss Points can be deducted proportionally as P miss =min(1,T) miss / T0)×w miss Alternatively, a step deduction method can be used to reduce P when the threshold is exceeded. missIt can be directly set to the preset value to meet the configuration requirements of different engineering sites for the tolerance of missing measurements.

[0104] In the above implementation, jump assessment is used to identify anomalous abrupt changes between adjacent samples. For the net distance difference between aligned adjacent samples, Δd(i,j,k) = |d(i,j,k) - d(i,j,k-1)| is calculated and compared with the jump threshold J0. When Δd(i,j,k) is greater than J0, the data with sample number k is marked as a jump anomaly, and the deduction item P is increased. jump This reduces C(k). To reduce the probability of a true displacement change being misjudged as a jump, jump assessment can be combined with consistency or echo quality for auxiliary judgment: if the change direction of two measuring points in the same cross section is consistent and the difference in change amplitude is within the consistency threshold, or if the sensor echo quality index meets the preset conditions, the jump deduction intensity can be reduced; if the echo quality index degrades, the effective echo ratio decreases, or the change direction of the two measuring points is significantly opposite, the jump deduction intensity can be increased or the corresponding sample can be marked as invalid.

[0105] In the above implementation, drift assessment is used to identify the decrease in reliability caused by the slow shift of the net distance value under relatively stable operating conditions. A preset time window W is set, for example, from 1 minute to 10 minutes, and the mean or median net distance m(i,j,k) is calculated within this time window. The statistical value of the current time window is compared with the statistical value of the previous time window to obtain the drift amount Δm(i,j,k) = |m(i,j,k) - m(i,j,kW)|. Here, W can represent the number of sampling points corresponding to the length of the time window, or represent the length of the time window converted from the sampling period to the corresponding number of sampling points. When Δm(i,j,k) is greater than the drift threshold D... r0 At that time, increase the deduction item P. drift And reduce C(k). In some implementations, drift assessment can be gated in conjunction with the construction conditions, for example, by increasing the sensitivity of drift assessment during periods of equipment shutdown or work quiescence to identify earlier slow distortions caused by contamination adhesion, changes in azimuth angle, or sensor temperature drift.

[0106] In the above implementation, the calibration validity period assessment is used to ensure the timeliness of the net distance conversion offset and the distance measurement reference. For the sampling timestamp T(k) of sampling number k, its relationship with the calibration timestamp T is calculated. cal The time interval ΔT cal (k) = T(k) - T cal and the calibration validity period threshold T cal0 Comparison. When ΔT cal (k) is greater than T cal0In such cases, the penalty item Pcal is increased to reduce C(k), or the corresponding data is marked as overdue and requires recalibration, and the credibility is reduced to below the credibility threshold. For a safety-first implementation, when calibration is overdue and missing measurements or echo quality degradation occur simultaneously, C(k) can be directly reduced to untrustworthy to trigger failure protection blocking.

[0107] In some implementations, the confidence level of a single measurement point is defined as c(i,j,k) = clip(1-P). miss -P jump -P drift -P cal (0, 1), and define the global credibility index as C(k) = min i，j c(i, j, k) can be defined as the confidence level of the key measurement point that generates the global minimum net distance. Here, clip(x, 0, 1) restricts x to the range [0, 1]. Threshold parameters T0, J0, and D... r0 T cal0 and weight w miss w jump w drift w cal It can be set as a configurable preset parameter by the construction stage, sensor accuracy, and on-site environmental conditions, or updated by the backend. By implementing at least one of continuous missing measurements, jumps, drift, and calibration validity period into calculable engineering rules, the reliability assessment results can be reproduced and traced, and failure protection can be achieved by reducing C(k) to trigger a blockade when the data is unreliable.

[0108] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0109] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A monitoring and control system for the net distance between pipelines in municipal road foundation pits, characterized in that, include: The clearance measurement component is used to collect clearance data between the foundation pit support components and existing municipal pipelines; An edge gateway controller, communicatively connected to the clearance measurement component, is configured to: acquire clearance data at at least three measurement sections distributed along the axial direction of the existing municipal pipeline, wherein each measurement section includes at least a first clearance measurement point and a second clearance measurement point; for each measurement section, take the minimum value of the clearance data between the first clearance measurement point and the second clearance measurement point to obtain the minimum clearance of the section, and take the minimum value of the minimum clearance of each measurement section to obtain the global minimum clearance; calculate the clearance approximation rate, which is the global minimum clearance at the previous sampling time minus the global minimum clearance at the next sampling time, and then divide by the time difference between adjacent sampling times; perform a reliability assessment based on at least one of the following: missing measurement, jump, drift, and calibration validity period of the clearance data, to obtain a global reliability index; and output a blocking command when any of the following blocking conditions are met: the global minimum clearance is not greater than a preset blocking clearance threshold, or the clearance approximation rate is not less than a preset blocking rate threshold, or the global reliability index is lower than a preset reliability threshold. A physical containment actuator is used to implement construction containment in response to the containment command; A sealing in place feedback device is used to detect and feedback the sealing in place status of the physical sealing actuator to the edge gateway controller; The construction process control module is used to respond to the closure command and output a process control signal to at least one of the operation equipment control loop and the passage control device, so that the preset dangerous process is in at least one of the states of prohibiting start and prohibiting passage.

2. The system according to claim 1, characterized in that, The foundation pit support components include double rows of piles and a crossbeam between the piles, with the existing municipal pipeline located below the crossbeam.

3. The system according to claim 2, characterized in that, The at least three measurement sections include at least: a measurement section corresponding to the mid-span of the pile-beam and two measurement sections on either side of the pile-beam connection node.

4. The system according to claim 1, characterized in that, The edge gateway controller is further configured to: upon receiving feedback that the blockade has been completed, determine whether to unblock the work; and when the global minimum clearance is not less than a preset unblocking clearance threshold and remains stable for a preset window duration, and the global credibility index is not lower than a preset credibility threshold, and the clearance approach rate is lower than a preset unblocking rate threshold, output an unblocking command to release the construction blockade and restore at least one of the preset dangerous process start permission and access permission, wherein the unblocking clearance threshold is greater than the blockade clearance threshold.

5. A clearance measurement component for monitoring the safety clearance of existing pipelines in municipal road foundation pits, applied to the system described in claim 1, characterized in that, include: Side mounting base for support components, used to fix the foundation pit support components; A clearance sensor is installed on the side mounting base of the support member for non-contact distance measurement and outputting clearance signal. Pipeline-side reference components are used to non-destructively fix them to the outer wall of existing municipal pipelines using clamps. The pipeline-side reference components include a planar reference target plate. A direction-finding limiting structure is used to limit the measurement direction of the net distance sensor to the planar reference target plate; A protective structure is provided for protecting the clearance sensor. as well as A detachable connection structure is used to realize a detachable connection between the clearance sensor and the side mounting base of the support member; The planar reference target plate provides a reproducible distance measurement reference surface for the clearance sensor, thereby enabling the clearance measurement component to output clearance data between the foundation pit support component and the existing municipal pipeline.

6. The clearance measuring component according to claim 5, characterized in that, The support component side mounting base includes a base plate and an adjustable bracket, and the direction-finding structure includes a positioning component and a locking component, used to lock the measurement direction of the net distance sensor to a preset direction pointing to the planar reference target plate.

7. The clearance measuring component according to claim 5, characterized in that, The clamp includes a metal band and an elastic pad, and the outer side of the planar reference target plate is provided with at least one of a frame for preventing mud adhesion and a mud scraping structure.

8. A method for monitoring and controlling the safety clearance of existing pipelines in municipal road foundation pits, applied to the system described in claim 1, characterized in that, include: S1) Set up at least three measurement sections along the axis of the existing municipal pipeline, and set up at least a first net distance measuring point and a second net distance measuring point in each measurement section; S2) Collect at least the net distance data of the first net distance measuring point in each measurement section as the first net distance value, and collect the net distance data of the second net distance measuring point in each measurement section as the second net distance value, and record the calibration timestamp at the same time. S3) For each measurement section, take the minimum value of the first net distance value and the second net distance value as the minimum net distance of the section, and take the minimum value of the minimum net distance of each measurement section to obtain the global minimum net distance. S4) Calculate the net distance approximation rate, which is the value obtained by subtracting the global minimum net distance at the next sampling time from the global minimum net distance at the previous sampling time, and then dividing by the time difference between adjacent sampling times. S5) Based on at least one of the missing measurements, jumps, drifts, and calibration validity periods of the net distance data, a credibility assessment is performed to obtain a global credibility index; S6) A lockdown trigger event is generated when any of the following conditions are met: the global minimum net distance is not greater than the preset lockdown net distance threshold, or the net distance approach rate is not less than the preset lockdown rate threshold, or the global credibility index is lower than the preset credibility threshold. S7) In response to the sealing trigger event, drive the physical sealing actuator to implement construction sealing, and collect sealing in place feedback to determine whether the sealing is in place. At the same time, output process control signal to at least one of the operation equipment control loop and the passage control device, so that the preset dangerous process is in at least one of the states of prohibiting start and prohibiting passage. S8) After receiving feedback that the lockdown is in place, continue to collect net distance data and make a decision on unsealing; when the global minimum net distance is not less than the preset unsealing net distance threshold and continues for a preset stable window duration, and the global credibility index is not lower than the preset credibility threshold, and the net distance approach rate is lower than the preset unsealing rate threshold, unsealing is performed and at least one of the preset dangerous procedure start permission and access permission is restored, wherein the unsealing net distance threshold is greater than the lockdown net distance threshold.

9. The method according to claim 8, characterized in that, The at least three measurement sections include at least: a measurement section at the mid-span of the crossbeam between piles and two measurement sections on either side of the pile-beam connection node.

10. The method according to claim 8, characterized in that, The reliability assessment includes at least one of the following: the duration of continuous missing tests exceeds the missing test threshold, which reduces the global reliability index; the net distance difference between adjacent samples exceeds the jump threshold, which reduces the global reliability index; the mean net distance drift within a preset time window exceeds the drift threshold, which reduces the global reliability index; and the time interval between the current sampling time and the calibration timestamp exceeds the calibration validity period, which reduces the global reliability index.

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