BIM and intelligent detection-based comprehensive pipe gallery support precise construction method

Abstract

This invention discloses a precise construction method for integrated utility tunnel supports based on BIM and intelligent detection, belonging to the field of urban underground integrated utility tunnel support construction technology. The method includes the following steps: S1, preliminary preparation; S2, digital modeling; S3, on-site detection fusion; S4, precise marking; S5, standardized construction; S6, component installation; S7, system acceptance. This invention employs the aforementioned precise construction method for integrated utility tunnel supports based on BIM and intelligent detection. By integrating BIM with the GW50 rebar detector, it optimizes the support layout in advance, accurately locates rebars, avoids drilling into rebars, and reduces structural risks and rework rates. It clarifies equipment and steps, implements full-chain management, reduces deviations, and improves efficiency. Focusing on support installation, it clarifies equipment, standards, and benefits, enhancing the adaptability of underground utility tunnels.

Description

Technical Field

[0001] This invention belongs to the field of construction technology of urban underground integrated pipe gallery supports, specifically involving a precise construction method for integrated pipe gallery supports based on BIM and intelligent detection. Background Technology

[0002] In the construction of urban underground utility tunnels, the supports serve as a key factor in the stable operation of pipelines, and their construction quality directly affects the safety and service life of the tunnels.

[0003] However, existing technologies have the following shortcomings: relying on manual experience without accurate detection of reinforcing bars can easily lead to rework and structural damage; conventional BIM only performs layout simulation without linking with on-site data, resulting in positioning errors, poor positioning accuracy, and a high risk of structural damage; there is a lack of clear equipment selection and key processes such as "detection and calibration," leading to a disconnect between the design model and on-site construction data, resulting in a rough construction process with low efficiency and quality; conventional BIM pipe gallery technology focuses on global optimization without designing specific solutions for support installation, and lacks equipment parameters and practical details, resulting in weak technical replicability and limited adaptability.

[0004] Therefore, a new method is urgently needed. Summary of the Invention

[0005] The purpose of this invention is to provide a precise construction method for integrated utility tunnel supports based on BIM and intelligent detection. This method integrates BIM with the GW50 rebar detector to optimize the support layout in advance, accurately locate the rebars, avoid drilling and touching the rebars, and reduce structural risks and rework rates. It clarifies equipment and steps, manages the entire chain, reduces deviations and improves efficiency. It focuses on support installation, clarifies equipment, standards and benefits, and improves the adaptability of underground utility tunnels.

[0006] To achieve the above objectives, this invention provides a precise construction method for integrated utility tunnel supports based on BIM and intelligent detection, comprising the following steps: S1. Organize technical personnel and construction teams to study the construction drawings of the pipe gallery structure, detailed drawings of the support installation, and pipeline layout drawings, and mark key information; Conduct technical briefings and safety training, and organize assessments. Only personnel who pass the assessments are allowed to work. Check the water and electricity supply at the construction site, clean up the construction area, and mark dangerous areas. Calibrate the rebar detector, electric drill, electronic level, and measuring tape and keep the calibration report; verify the specifications and material certificates of the support columns, brackets, and bolts, and stack them in categories after completing the appearance inspection; S2. Based on the construction drawings, material acceptance list and relevant specification accuracy requirements of S1, a three-dimensional model is constructed using BIM software; the clash detection function is activated to check the spatial conflicts between the support and the pipe gallery structure, pipelines and the support itself, and a clash detection report is generated; the support layout and borehole preset positions are optimized for the conflict points, and a construction version BIM model and a borehole preset position coordinate table are generated. S3, based on the BIM construction model of S2, the calibration parameters of the rebar detector of S1 and the partition coordinates of the pipe gallery wall, divide the detection area according to the preset spacing of the axis and mark it; Operate the rebar detector to scan horizontally and uniformly along the wall of the pipe gallery at a preset speed, and record the scanning information to form a rebar detection record table; Import the detection data into the BIM software, mark the position of the rebar in the model, and if the preset drilling point is less than the preset safety distance from the rebar, adjust the drilling coordinates and generate a corrected drilling coordinate table; conduct a second scan and verification of the detection points according to the preset ratio to ensure that the deviation between the model rebar marking and the actual deviation meets the preset accuracy requirements, and export the integrated BIM model. S4. Based on the integrated BIM model of S3, the reinforcement avoidance area marking map and the pipe gallery wall zoning mark, find the benchmark point of the detection area, and use a tape measure to check the X-axis and Z-axis coordinates of the drilling point. If the deviation meets the preset marking accuracy, it is considered qualified. Construction personnel worked together to mark the drilling location lines and create indentations at the points, marking them with numbers. For drilling points in complex areas, a rebar detector was used for a second scan to confirm that there were no hidden rebars. If there were, the coordinates were adjusted and remarked, and a verification record sheet for complex areas was kept. S5. Based on the drilling position line markings and bolt specification parameters of S4, the electric drill operation parameters and deep hole segment cleaning standards of S1, select the corresponding drill bit according to the bolt specifications; Determine the drilling depth according to the bolt length and mark it on the drill bit. Keep the electric drill perpendicular to the wall and drill at a constant speed. When the depth exceeds the preset segment threshold, adopt the process of segmented drilling and cleaning up debris. After drilling is completed, the depth, diameter and verticality are checked. The verticality meets the preset drilling accuracy. The dust in the hole is blown out with a high-pressure air gun a preset number of times. Deep holes are cleaned with tools. After the hole is sealed, the drilling quality inspection form is kept. S6. Based on the qualified drilling records of S5, the integrated BIM model of S3, the accuracy parameters of the measuring equipment and the standard installation accuracy of S1, the support column is moved to the installation position and temporarily fixed. Insert the appropriate fastening bolts, tighten the nuts in stages according to the preset torque and record the torque data; use an electronic level to calibrate the column elevation, use a tape measure to calibrate the axis position, and use a straightedge to calibrate the verticality to ensure that all deviations meet the preset installation accuracy. After acceptance, fill in the bracket column installation acceptance record form. S7, based on the column acceptance record of S6, the integrated BIM model of S3, the accuracy parameters of the level and the relevant steel structure construction quality acceptance specifications, mark the bracket installation position on the column according to the model design height and angle; Insert the appropriate connecting bolts and pre-tighten them. Use a square to calibrate the angle between the bracket and the column, use a level to calibrate the levelness, then tighten the bolts to the specified torque and record the data. Measure the distance between adjacent brackets to ensure uniformity. The appearance and performance of the support system shall be inspected. The components shall be free from deformation and corrosion, the exposed threads of the bolts shall meet the preset length, there shall be no shaking when the preset horizontal force is applied, and there shall be no sagging when the preset load is held statically for a specified time. The axis deviation, verticality and horizontality of the bracket shall meet the preset acceptance accuracy. After the acceptance is qualified, the general acceptance report of the integrated utility tunnel support system shall be filled in.

[0007] Preferably, the specific requirements for equipment calibration in S1 are as follows: The rebar detector is calibrated using standard rebar specimens, and the deviation between the detection results and the actual parameters of the specimens is ≤5mm. Test drilling with 8mm, 12mm, and 16mm drill bits; the verticality deviation of the drill hole was ≤0.5°. The electronic level has a round-trip error of ≤1mm per kilometer; the measuring tape error is ≤1mm within the 0-3m range.

[0008] Preferably, the BIM software mentioned in S2 is Revit software; the construction of the three-dimensional model is specifically as follows: Build a 3D model of the main structure, pipelines, and supports of the utility tunnel at a 1:1 scale, and input parameters such as spatial coordinates, dimensions, materials, and loads of each component.

[0009] Preferably, the scope of the collision inspection described in S2 includes: conflicts between the bracket and the wall reserved holes and embedded parts, conflicts between the bracket arm and the pipeline interface and valve, overlapping conflicts between adjacent bracket arms, and compliance conflicts of the bracket column spacing.

[0010] Preferably, in S3, the preset spacing is 5m, the preset speed is 5cm / s, the preset safety distance is 20mm, the preset ratio is 10%, and the preset accuracy requirement is a deviation ≤5mm; The specific process of operating the rebar detector to scan and record is as follows: The GW50 rebar detector is used to scan the wall horizontally at a constant speed. When a rebar is detected, the three-dimensional coordinates of the point, the direction of the rebar, and the estimated diameter are recorded. In areas with dense rebar, the detector is repeated twice using a grid scanning method with a spacing of 10cm, and a rebar detection record table is generated.

[0011] Preferably, the preset marking accuracy in S4 is ≤2mm; the drilling position line is red with a line width ≤1mm; and the diameter of the marking indentation is 2-3mm.

[0012] Preferably, the preset segmentation threshold in S5 is 50mm, the preset number of times is 3, and the preset drilling accuracy is verticality deviation ≤1°; The specific steps for selecting the corresponding drill bit according to the bolt specification are as follows: M12 expansion bolts correspond to 12mm diameter alloy drill bits; the drilling depth is the bolt length plus 10mm for dust allowance, and the hole diameter deviation is ≤0.5mm.

[0013] Preferably, the fastening bolts used in S6 are M12×80mm expansion bolts; The preset torque is tightened in stages as follows: Tighten to 20 N·m for the first time, let stand for 5 minutes, and then tighten to 35 N·m for the second time; the preset installation accuracy is: column elevation deviation ≤ 5 mm, axis position deviation ≤ 5 mm, verticality deviation ≤ 3‰.

[0014] Preferably, the relevant steel structure construction quality acceptance standard mentioned in S7 is the "Code for Acceptance of Construction Quality of Steel Structure Engineering"; the matching connecting bolt is an M12×30mm bolt; the preset length is 2-3 threads; the preset horizontal force is 500N; the preset load is 5kN; and the specified time is 1 hour. The preset acceptance accuracy is: The deviation of the included angle between the bracket and the column is ≤1°, the deviation of the distance between adjacent brackets is ≤5mm, the deviation of the bracket axis is ≤5mm, the verticality deviation is ≤3‰, and the horizontality deviation of the bracket is ≤2mm.

[0015] Therefore, the present invention adopts the above-mentioned precise construction method for integrated utility tunnel supports based on BIM and intelligent detection. Compared with the prior art, the technical solution of the present invention has the following beneficial effects: (1) By deeply integrating the BIM model with the GW50 rebar detector, the layout can be optimized in advance and the rebar can be accurately located, avoiding drilling and touching the rebar from the source, reducing the risk of structural damage to zero and the rework rate to a minimum. (2) Construct a 7-step closed-loop standardized process, clarify the special equipment and practical steps, realize full-link data management and control, reduce installation deviation, and improve construction efficiency; (3) By subdividing the installation scenarios of the bracket, the equipment model, quality standards and cost-effectiveness data are clarified to improve adaptability.

[0016] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0017] Figure 1 This is a flowchart illustrating an embodiment of the precise construction method for integrated utility tunnel supports based on BIM and intelligent detection, as described in this invention. Detailed Implementation

[0018] 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. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Unless otherwise defined, the technical or scientific terms used in the present invention should have the ordinary meaning understood by those skilled in the art.

[0019] Example 1 like Figure 1 As shown, the precise construction method for integrated utility tunnel supports based on BIM and intelligent detection of the present invention includes the following steps: S1. Organize technical personnel and construction teams to study the project drawings page by page, and highlight key information such as the thickness of the pipe gallery walls, the thickness of the steel reinforcement protective layer, and the reserved installation area for the supports; the project drawings include the pipe gallery structure construction drawings, detailed drawings of support installation, and pipeline layout drawings. Conduct technical briefings to clarify BIM modeling standards, rebar detection accuracy requirements, drilling and installation specifications; conduct safety training simultaneously, including equipment operation safety, high-altitude operation protection, etc. After training, candidates must pass theoretical and practical assessments and be allowed to work. Assessment records will be kept. Check the water and electricity supply at the construction site to ensure that the power supply voltage is stable (compatible with electric drills and detectors) and the water supply pressure meets the standards for cleaning drill debris; clean the construction area inside the pipe gallery, remove debris and mark dangerous areas; The rebar detector (GW50) is calibrated using standard rebar specimens, and scanned repeatedly three times to ensure that the detection results do not deviate from the actual parameters of the specimens. Record calibration data; check equipment power and data storage function; test the speed and torque of the electric drill (GSB 1202B), and test drill concrete blocks with three commonly used drill bits (e.g., 8mm, 12mm, 16mm) to confirm the verticality deviation of the drill hole. The electronic level is calibrated to a round-trip error of one kilometer. The standard for measuring tape calibration scale is as follows: Error within the range Verification reports are retained for all cases. Check the specifications and material certificates of the support columns (e.g., Q235 steel, cross-section 100×50mm), brackets (e.g., L-shaped, length 300mm), and bolts (e.g., M12×80mm expansion bolts) against the material list; The support components were visually inspected to ensure there were no rust, deformation, weld defects, or other issues. The bolt threads were intact. After acceptance, the components were classified, stacked, and labeled with their model numbers. An acceptance checklist was kept. S2. Based on the construction drawing data, material acceptance list, and accuracy requirements in relevant specifications output by S1, use Revit software to create a model; Create a new "Integrated Utility Tunnel Support Project" file and build a 1:1 scale model of the main structure of the utility tunnel: enter the spatial coordinates (establish a coordinate system with the starting point of the utility tunnel as the origin), dimensions, concrete strength grade and other parameters of the walls, top slab and bottom slab; Import the specifications, routes (e.g., horizontally laid along the side wall of the pipe gallery), and elevations (e.g., 2.5m from the ground) of various professional pipelines (water supply, power, and communication); enter the dimensions, materials, and load parameters of the support columns and brackets according to the material acceptance list, and arrange the support points according to the preliminary design plan; Use the collision check function to set the inspection scope, including: checking whether the bracket conflicts with the wall's reserved holes or embedded parts; checking whether the bracket arm obstructs key components such as pipeline interfaces and valves; checking whether the bracket column intersects with the pipeline route; checking whether adjacent bracket arms overlap and whether the column spacing meets the specifications. Generate a collision check report, marking the three-dimensional coordinates of the conflict points, the conflict type (e.g., "the support column intersects with the DN200 water supply pipe"), and the conflict distance; Develop optimization plans for collision points, such as adjusting the column axis position when the support column conflicts with the pipeline; raising / lowering the support installation elevation when the support conflicts with the reserved hole; optimizing the preset drilling position, determining the drilling spacing based on the support fixing requirements and bolt specifications, and marking the coordinates of the drilling center point in the model. After optimization, a construction version BIM model is generated, and the model file and the coordinate table of the preset drilling positions are exported. S3, based on the BIM construction model output from S2, the calibration parameters of the GW50 rebar detector output from S1, and the partition coordinates of the pipe gallery wall, divide the area into detection zones every 5m along the axial direction. Mark the zone number (e.g., "Zone 1: X=0-5m") and the preset drilling positions within the zone on the pipe gallery wall with chalk. These correspond to the drilling coordinates in the BIM construction model and are marked with crosshairs. Measure and record the start and end coordinates of each detection zone with a tape measure to ensure consistency with the BIM model coordinate system and avoid detection point offset. Construction workers used handheld GW50 rebar detectors, activated the "continuous scanning" mode, and moved at a constant horizontal speed along the wall within the detection area, maintaining a speed controlled within a specified range. To avoid data loss due to excessive speed; When the detector indicates "rebar detected," pause movement and record the 3D coordinates of that point, the direction of the rebar, and the estimated diameter. For areas with dense rebar, the "grid scanning method" is used to repeatedly detect the rebar twice, with a scanning interval of 10cm, to ensure data accuracy. The original detection data is recorded in the "Rebar Detection Record Form" to obtain the original rebar detection data. Import the data from the "Rebar Detection Record Sheet" into Revit software, and use the "Coordinate Matching" function to mark the rebar positions in the corresponding detection area in the BIM model; Comparing the preset drilling locations in the BIM model with the actual rebar distribution, if the preset drilling points are far from the rebar... If so, adjust the borehole coordinates and generate a "corrected borehole coordinate table"; Technical personnel reviewed the integrated "pipe gallery structure-support-reinforcement" model, randomly checking 10% of the detection points and performing a second scan on-site with a detector to ensure that the reinforcement markings in the model matched the actual values. After verification, export the integrated BIM model; Raw data from rebar detection, integrated BIM model of "pipe gallery structure-support-rebar", and verification report on the matching of detection data and model; S4. Based on the integrated BIM model output from S3, the reinforcement avoidance area annotation map, and the actual zoning marks of the utility tunnel wall, locate the reference points for the corresponding detection areas on the utility tunnel wall; use a measuring tape to measure the X (along the utility tunnel axis) and Z (vertical height) coordinates of each drilling point according to the coordinate table, and check them against the coordinates in the integrated model to determine the deviation. If the deviation exceeds the tolerance, the coordinates of the regional benchmark point should be rechecked. Adjust the ink line tension, with the cooperation of two construction workers; one person fixes the ink line on one side of the drilling point, and the other person pulls the straight body to the corresponding point on the other side, and lightly flicks the ink line to form a clear drilling position line on the wall (red ink line, line width ≤1mm). For each drilling point, tap the center point lightly with a punch to create a 2-3mm diameter indentation to prevent the point from being lost after the chalk line becomes blurred. Mark the drilling point with the same numbering method as the coordinate table. For drilling points in complex areas such as corners of pipe corridors and areas where multiple steel bars intersect, a second scan is performed using a GW50 steel bar detector: the detector probe is aligned with the center point of the borehole to confirm that there is no steel bar below the point. If unmarked hidden rebar is found in a complex area, immediately record the location of the rebar and report it to the technical personnel. After readjusting the drilling coordinates, mark it again and keep the "Complex Area Verification Record Form". S5. Based on the drilling position line markings and bolt specification parameters output by S4, the operating parameters of the GSB 120 2B electric drill output by S1, and the deep hole segment cleaning standards, select drilling equipment and tools. Determine the drill bit model based on the bolt specifications. For example, an M12 expansion bolt corresponds to a 12mm diameter alloy drill bit. Check the power cord and drill chuck of the GSB 120 2B electric drill. After installing the drill bit, test run it to confirm that the drill bit is not eccentric or wobble. Determine the drilling depth based on the bolt length. The worker holds the electric drill with both hands, keeping the drill bit axis perpendicular to the wall. After starting the drill, proceed at a constant speed. If the drilling depth... The "segmented drilling method" is adopted. After drilling 20mm, the electric drill is stopped, and the concrete debris in the hole is cleaned with a small brush before drilling continues until the marked depth is reached. After drilling is complete, turn off the electric drill and remove the drill bit. Use a tape measure to measure the drilling depth, use a hole gauge to check the hole diameter, and use a straightedge to check the perpendicularity deviation between the drill hole axis and the wall surface. Ensure there are no oblique holes or collapsed holes; Use a high-pressure air gun to blow away any residual dust inside the borehole, repeating the blowing process three times until no more dust is visible. For deep holes, a fine brush can be inserted to assist in cleaning. After cleaning, use a plug to seal the borehole opening to prevent debris from entering. Keep a copy of the "Drilling Quality Inspection Form". S6, based on the qualified borehole records output from S5, the integrated BIM model output from S3, the electronic level accuracy parameters output from S1, the tape measure accuracy data, and the installation accuracy required by the specifications, completes the fixing and accuracy calibration of the support column. Specifically: Locate the corresponding drilling point according to the "Revised Drilling Coordinate Table", move the support column (e.g., 1.2m high) to the installation position, handle it gently during transport to avoid deformation; adjust the column direction so that the bolt holes on the column are aligned with the drill holes in the wall (if the column has pre-drilled bolt holes, ensure that the hole positions are coaxial with the drill holes), and temporarily fix the column with wooden wedges to prevent it from tipping over; Remove the M12×80mm expansion bolts, remove the protective sleeves from the bolts, and insert the bolts into the bolt holes of the column and the drill holes in the wall, ensuring that the bolt heads are tightly against the surface of the column; use a torque wrench to tighten the bolt nuts, controlling the tightening torque according to the specifications, and tighten in two stages, first to 20 N·m, and then after standing for 5 minutes, tighten to 35 N·m to avoid stripping the bolt threads or cracking the drill hole due to one-time tightening, and record the bolt tightening torque data.

[0020] The accuracy of the support columns is calibrated and accepted. After successful calibration, the "Support Column Installation Acceptance Record Form" is filled out. Columns that fail acceptance must be readjusted until they meet the standards. Specifically: Set up the electronic level on the horizontal ground of the pipe gallery, align it with the elevation line marked on the top of the column (e.g., 2.5m), read the level reading, and compare it with the column elevation (2.5m) in the BIM model. The deviation should be ≤5mm. If the deviation exceeds the tolerance, adjust the elevation by loosening the bolts. Use a measuring tape to measure the distance between the column axis and the pipe rack axis. The deviation should be ≤5mm. If the deviation exceeds the tolerance, loosen the bolts, adjust the column position, and then tighten them again. Place the straightedge against the side of the column and read the verticality deviation value on the straightedge (≤3‰, such as a column height of 1.2m, the deviation ≤3.6mm). If the deviation exceeds the tolerance, gently tap the column with a mallet to adjust the verticality. S7. Based on the column acceptance record output from S6, the integrated BIM model output from S3, the level accuracy parameters, and the stability requirements in the "Code for Acceptance of Construction Quality of Steel Structures" (GB50205-2020), complete the overall assembly of the support structure and verify its quality. Specifically: According to the design height and angle of the bracket in the integrated BIM model, mark the installation position of the bracket on the column with a marker; check the matching of the bracket model and the installation position, and check whether the bracket connection hole is aligned with the reserved hole of the column. Align the support arm with the marked position on the column, ensuring the support arm connection hole aligns with the column hole. Insert the M12×30mm connecting bolt and pre-tighten the nut with a wrench. Use a square to check the angle between the support arm and the column to ensure it is 90° with a deviation of ≤1°. Use a level to check the levelness of the support arm. After confirming that everything is correct, use a torque wrench to tighten the bolt to the specified torque and record the tightening data. For multiple consecutive support arms, use a tape measure to measure the distance between adjacent support arms to ensure that the spacing is uniform and meets the pipeline laying requirements.

[0021] After the overall acceptance of the support system is completed and all indicators meet the standards, the "Comprehensive Utility Tunnel Support System Acceptance Report" shall be filled out and signed and confirmed by technical, quality inspection, and supervision personnel. Only after the acceptance is qualified can the subsequent pipeline installation process begin. Specific requirements are as follows: The support components are free from deformation and corrosion, the exposed thread length of the bolts is 2-3 threads, and the welds are free from defects such as cracks and undercut. When a horizontal force is applied to the support by hand, the support does not shake significantly and the bolts are not loose. The load-bearing capacity of the support arm is checked. An equivalent load block (such as a 5kN weight) can be placed on it. After 1 hour, the support arm does not sag or deform. In accordance with the "Code for Acceptance of Construction Quality of Steel Structures" (GB50205-2020), the deviation of the support axis (≤5mm), verticality (≤3‰), and horizontality of the bracket (≤2mm) were checked.

[0022] Therefore, this invention adopts the above-mentioned precise construction method for integrated utility tunnel supports based on BIM and intelligent detection. This method integrates BIM with the GW50 rebar detector to optimize the support layout in advance, accurately locate the rebar, avoid drilling and touching the rebar, and reduce structural risks and rework rates. It clarifies equipment and steps, manages the entire chain, reduces deviations and improves efficiency. It focuses on support installation, clarifies equipment, standards and benefits, and improves the adaptability of underground utility tunnels.

[0023] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0024] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A precise construction method for integrated utility tunnel supports based on BIM and intelligent detection, characterized in that, Includes the following steps: S1. Organize technical personnel and construction teams to study the construction drawings of the pipe gallery structure, detailed drawings of the support installation, and pipeline layout drawings, and mark key information; Conduct technical briefings and safety training, and organize assessments. Only personnel who pass the assessments are allowed to work. Check the water and electricity supply at the construction site, clean up the construction area, and mark dangerous areas. Calibrate the rebar detector, electric drill, electronic level, and measuring tape and keep the calibration report; verify the specifications and material certificates of the support columns, brackets, and bolts, and stack them in categories after completing the appearance inspection; S2. Based on the construction drawing data, material acceptance list and relevant specification accuracy requirements of S1, a three-dimensional model is constructed using BIM software; Activate the clash detection function to check for spatial conflicts between the support and the pipe gallery structure, pipelines and the support itself, and generate a clash detection report; optimize the support layout and preset drilling positions for the conflict points, and generate a construction version BIM model and a coordinate table of preset drilling positions. S3, based on the BIM construction model of S2, the calibration parameters of the rebar detector of S1 and the partition coordinates of the pipe gallery wall, divide the detection area according to the preset spacing of the axis and mark it; Operate the rebar detector to scan horizontally and uniformly along the wall of the pipe gallery at a preset speed, and record the scanning information to form a rebar detection record table; Import the detection data into the BIM software, mark the position of the rebar in the model, and if the preset drilling point is less than the preset safety distance from the rebar, adjust the drilling coordinates and generate a corrected drilling coordinate table; conduct a second scan and verification of the detection points according to the preset ratio to ensure that the deviation between the model rebar marking and the actual deviation meets the preset accuracy requirements, and export the integrated BIM model. S4. Based on the integrated BIM model of S3, the reinforcement avoidance area marking map and the pipe gallery wall zoning mark, find the benchmark point of the detection area, and use a tape measure to check the X-axis and Z-axis coordinates of the drilling point. If the deviation meets the preset marking accuracy, it is considered qualified. Construction personnel worked together to mark the drilling location lines and create indentations at the points, marking them with numbers. For drilling points in complex areas, a rebar detector was used for a second scan to confirm that there were no hidden rebars. If there were, the coordinates were adjusted and remarked, and a verification record sheet for complex areas was kept. S5. Based on the drilling position line markings and bolt specification parameters of S4, the electric drill operation parameters and deep hole segment cleaning standards of S1, select the corresponding drill bit according to the bolt specifications; Determine the drilling depth according to the bolt length and mark it on the drill bit. Keep the electric drill perpendicular to the wall and drill at a constant speed. When the depth exceeds the preset segment threshold, adopt the process of segmented drilling and cleaning up debris. After drilling is completed, the depth, diameter and verticality are checked. The verticality meets the preset drilling accuracy. The dust in the hole is blown out with a high-pressure air gun a preset number of times. Deep holes are cleaned with tools. After the hole is sealed, the drilling quality inspection form is kept. S6. Based on the qualified drilling records of S5, the integrated BIM model of S3, the accuracy parameters of the measuring equipment and the standard installation accuracy of S1, the support column is moved to the installation position and temporarily fixed. Insert the appropriate fastening bolts, tighten the nuts in stages according to the preset torque and record the torque data; use an electronic level to calibrate the column elevation, use a tape measure to calibrate the axis position, and use a straightedge to calibrate the verticality to ensure that all deviations meet the preset installation accuracy. After acceptance, fill in the bracket column installation acceptance record form. S7, based on the column acceptance record of S6, the integrated BIM model of S3, the accuracy parameters of the level and the relevant steel structure construction quality acceptance specifications, mark the bracket installation position on the column according to the model design height and angle; Insert the appropriate connecting bolts and pre-tighten them. Use a square to calibrate the angle between the bracket and the column, use a level to calibrate the levelness, then tighten the bolts to the specified torque and record the data. Measure the distance between adjacent brackets to ensure uniformity. The appearance and performance of the support system shall be inspected. The components shall be free from deformation and corrosion, the exposed threads of the bolts shall meet the preset length, there shall be no shaking when the preset horizontal force is applied, and there shall be no sagging when the preset load is held statically for a specified time. The axis deviation, verticality and horizontality of the bracket shall meet the preset acceptance accuracy. After the acceptance is qualified, the general acceptance report of the integrated utility tunnel support system shall be filled in.

2. The precise construction method for integrated utility tunnel supports based on BIM and intelligent detection as described in claim 1, characterized in that, The specific requirements for equipment calibration described in S1 are as follows: The rebar detector is calibrated using standard rebar specimens, and the deviation between the detection results and the actual parameters of the specimens is ≤5mm. Test drilling with 8mm, 12mm, and 16mm drill bits; the verticality deviation of the drill hole was ≤0.5°. The electronic level has a round-trip error of ≤1mm per kilometer; the measuring tape error is ≤1mm within the 0-3m range.

3. The precise construction method for integrated utility tunnel supports based on BIM and intelligent detection as described in claim 1, characterized in that, The BIM software mentioned in S2 is Revit software; the construction of the three-dimensional model is specifically as follows: Build a 3D model of the main structure, pipelines, and supports of the utility tunnel at a 1:1 scale, and input parameters such as spatial coordinates, dimensions, materials, and loads of each component.

4. The precise construction method for integrated utility tunnel supports based on BIM and intelligent detection according to claim 1, characterized in that, The scope of collision inspection described in S2 includes: conflicts between the bracket and the wall's reserved holes and embedded parts, conflicts between the bracket arm and pipeline interfaces and valves, overlapping conflicts between adjacent bracket arms, and compliance conflicts of the bracket column spacing.

5. The precise construction method for integrated utility tunnel supports based on BIM and intelligent detection according to claim 1, characterized in that, The preset spacing in S3 is 5m, the preset speed is 5cm / s, the preset safety distance is 20mm, the preset ratio is 10%, and the preset accuracy requirement is a deviation ≤5mm; The specific process of operating the rebar detector to scan and record is as follows: The GW50 rebar detector is used to scan the wall horizontally at a constant speed. When a rebar is detected, the three-dimensional coordinates of the point, the direction of the rebar, and the estimated diameter are recorded. In areas with dense rebar, the detector is repeated twice using a grid scanning method with a spacing of 10cm, and a rebar detection record table is generated.

6. The precise construction method for integrated utility tunnel supports based on BIM and intelligent detection according to claim 1, characterized in that, The preset marking accuracy in S4 is a deviation of ≤2mm; the drilling position line is red with a line width of ≤1mm; and the diameter of the marking indentation is 2-3mm.

7. The precise construction method for integrated utility tunnel supports based on BIM and intelligent detection as described in claim 1, characterized in that, The preset segmentation threshold in S5 is 50mm, the preset number of times is 3, and the preset drilling accuracy is verticality deviation ≤1°. The specific steps for selecting the corresponding drill bit according to the bolt specification are as follows: M12 expansion bolts correspond to 12mm diameter alloy drill bits; the drilling depth is the bolt length plus 10mm for dust allowance, and the hole diameter deviation is ≤0.5mm.

8. The precise construction method for integrated utility tunnel supports based on BIM and intelligent detection according to claim 1, characterized in that, The fastening bolts described in S6 are M12×80mm expansion bolts; The preset torque is tightened in stages as follows: Tighten to 20 N·m for the first time, let stand for 5 minutes, and then tighten to 35 N·m for the second time; the preset installation accuracy is: column elevation deviation ≤ 5 mm, axis position deviation ≤ 5 mm, verticality deviation ≤ 3‰.

9. The precise construction method for integrated utility tunnel supports based on BIM and intelligent detection according to claim 1, characterized in that, The relevant steel structure construction quality acceptance standard mentioned in S7 is the "Code for Acceptance of Construction Quality of Steel Structure Engineering"; the matching connecting bolts are M12×30mm bolts; the preset length is 2-3 threads; the preset horizontal force is 500N; the preset load is 5kN; and the specified time is 1 hour. The preset acceptance accuracy is: The deviation of the included angle between the bracket and the column is ≤1°, the deviation of the distance between adjacent brackets is ≤5mm, the deviation of the bracket axis is ≤5mm, the verticality deviation is ≤3‰, and the horizontality deviation of the bracket is ≤2mm.

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