A steel structure temporary support system and support method based on BIM

Abstract

This application discloses a BIM-based temporary support system and method for steel structures. The support system includes a temporary support frame with several adaptive adjustment devices. These devices have horizontal movement and vertical extension / retraction functions, supporting the steel truss. The support method includes the following steps: establishing a steel truss structural model; determining the location of the temporary supports; extracting the coordinates of the support points; establishing a measurement and control system; designing and fabricating the temporary support frame; installing the temporary support frame on-site; installing the adaptive adjustment devices; inputting the support point coordinates; vertically adjusting the adaptive adjustment devices; and assembling the steel truss. The beneficial effects of this application include: achieving precise positioning and automatic alignment of support points; achieving bidirectional adaptive adjustment of the support devices in both horizontal and vertical directions; achieving remote intelligent control of temporary supports; achieving automatic verification and closed-loop control of the support status; improving construction efficiency and reducing labor costs.

Description

Technical Field

[0001] This application belongs to the field of steel structure building construction technology, specifically relating to a BIM-based temporary support system and support method for steel structures. Background Technology

[0002] Steel structures, due to their advantages such as light weight, high strength, and fast construction speed, have been widely used in engineering fields such as large factories, stadiums, super high-rise buildings, and long-span bridges. During the construction of spatial steel structures such as long-span steel trusses and steel space frames, the structure cannot maintain stability on its own rigidity before it is fully formed. Temporary support systems are necessary to provide a high-altitude assembly platform and load-bearing transition. The proper design of the temporary support system directly affects construction safety, installation accuracy, and project progress, and is a crucial aspect of steel structure engineering construction.

[0003] Currently, temporary supports for steel structures mainly employ lattice columns, formwork, and steel pipe supports. The layout of traditional temporary support systems relies heavily on the engineering experience of construction workers, with support points determined through manual surveying and layout. After the support frame is fabricated, it is installed on-site. This method has the following prominent problems: First, the determination of support point locations lacks precise data support. In traditional methods, the location of temporary supports is usually roughly determined based on construction drawings and on-site experience, without precise spatial coordinate matching with the three-dimensional model of the steel truss structure. Deviations in support point locations can directly lead to eccentric stress on the supports, affecting the stability of the support system, and may even cause excessive deformation of the steel truss during assembly.

[0004] Secondly, the adjustment capabilities for support height and horizontal position are limited. Most existing temporary supports only offer vertical height adjustment, and the adjustment methods are mostly manual operation using jacks or wedges, resulting in low precision and efficiency. For steel structures with complex spatial shapes, support points often need to simultaneously meet the dual requirements of precise horizontal and vertical positioning. However, existing support devices lack autonomous horizontal adjustment capabilities, making them difficult to adjust once installed. While some adjustable supports are equipped with telescopic mechanisms, these are mostly unidirectional adjustments, failing to achieve multi-dimensional adaptive support.

[0005] Third, the installation and adjustment of temporary supports rely heavily on manual labor. Measuring and setting out support points, positioning and installing support frames, and adjusting support heights one by one all require on-site manual work by technicians. This is not only time-consuming and labor-intensive, but also makes it difficult to ensure consistency and coordination when multiple people are working together at multiple points. Especially in the assembly of large steel trusses with multiple supports, the elevation and horizontal position of each support point need to be uniformly coordinated, and manual operation is prone to accumulating deviations.

[0006] Fourth, the level of informatization and intelligence is low. Although BIM technology has been widely used in steel structure detailed design and construction simulation, there is a lack of effective data connection between the BIM model and the construction operation of temporary supports on site. The precise coordinate information contained in the BIM model in the design phase cannot be directly transferred to the installation and adjustment of temporary supports, resulting in "BIM model guiding construction" becoming a mere formality and an information gap between design and construction.

[0007] To address the aforementioned issues, some technologies have attempted to combine BIM technology with temporary supports. For example, one solution proposes an adjustable temporary support structure based on BIM technology, using high-strength bolts and wedges to achieve height adjustment and rapid assembly / disassembly; another solution proposes an adaptive temporary diagonal brace structure, using sensors and drive devices to achieve adaptive compensation of tilt angles. However, these technologies still have significant shortcomings: on the one hand, the horizontal position adjustment capability of the support device is lacking or limited, and it cannot perform autonomous horizontal positioning based on the precise coordinates extracted from the BIM model; on the other hand, there is a lack of a systematic and complete technical closed loop from BIM model coordinate extraction to automatic positioning of the on-site support device, and the adjustment process still requires manual intervention, indicating that the level of intelligence needs to be improved. Summary of the Invention

[0008] The purpose of this application is to provide a BIM-based temporary support system and method for steel structures, which solves the problem of poor support effect of existing temporary support systems for steel structures.

[0009] The objective of this application is achieved through the following technical solution: A BIM-based temporary support system for steel structures includes a temporary support frame with several adaptive adjustment devices on it. The adaptive adjustment devices have horizontal movement and vertical extension / retraction functions, and the adaptive adjustment devices support the steel truss.

[0010] Furthermore, the temporary support frame includes support columns, crossbars, longitudinal crossbars, and cantilever crossbars. Crossbars are provided between the lower parts of the support columns, longitudinal crossbars are provided between the upper parts of the support columns, and cantilever crossbars are provided on the inner sides of the upper parts of the support columns. Adjustment devices are provided on the front and rear crossbars and the front and rear cantilever crossbars.

[0011] Furthermore, the adaptive adjustment device includes a horizontally movable base and a telescopic support column. The horizontally movable base is mounted on a temporary support frame, and the telescopic support column is mounted on the horizontally movable base. The telescopic support column supports the steel truss by its own extension and retraction.

[0012] A BIM-based method for temporary support of steel structures includes the following steps: Step 1, Create a steel truss structure model: Based on the design drawings, create a BIM 3D model of the steel truss structure; Step 2, determine the location of temporary supports: Based on the BIM 3D model of the steel truss structure, determine the location of temporary supports in the model according to the length of the steel truss, load distribution and assembly node parameters; Step 3, extract support point coordinates: merge the design coordinate diagram containing coordinate information with the BIM 3D model of the steel truss structure, and obtain the horizontal coordinates (x, y) of the support points through projection. Step 4, Establish a measurement control system: Based on the design drawings and on-site coordinate control points, establish measurement control axes for the steel truss and temporary supports; Step 5, design and fabrication of temporary support frame; Step 6, Temporary support frame on-site installation: The temporary support frame is positioned and installed using a measurement and control system; Step 7, Installation of the adaptation and adjustment device: Install the adaptation and adjustment device between the temporary support frame and the steel truss; Step 8, Input support point coordinates: Input the coordinates of the temporary support point into the adaptation and adjustment device. The adaptation and adjustment device adjusts the horizontal position according to the coordinates to ensure that the force is vertical and uniform. The horizontal position of the adaptation and adjustment device is remotely self-locked. Step 9, Vertical adjustment of the adaptation adjustment device: The vertical position of the adaptation adjustment device is adjusted remotely, and the adaptation adjustment device is extended to the elevation control point to ensure that the support point of the adaptation adjustment device is completely in close contact with the steel truss. Step 10: Assemble the steel truss.

[0013] Furthermore, in step 8, the horizontal moving base of the adaptive adjustment device is equipped with a bidirectional lead screw drive mechanism arranged along the X and Y directions. The bidirectional lead screw drive mechanism is driven by a servo motor, which integrates an absolute encoder. The absolute encoder collects the displacement data of the horizontal moving base in real time and feeds it back to the remote control terminal. The remote control terminal performs a closed-loop comparison between the horizontal coordinates (x, y) of the support point extracted in step 3 and the real-time position data fed back by the absolute encoder. When the deviation exceeds ±1mm, the servo motor is automatically driven to perform fine-tuning compensation until the horizontal moving base moves to the target coordinate position. After the horizontal position adjustment is completed, the remote control terminal sends a self-locking command to the bidirectional lead screw drive mechanism. The electromagnetic brake built into the drive mechanism is energized to hold the brake, realizing the self-locking fixation of the horizontal position.

[0014] Furthermore, in step 9, the telescopic support column of the adaptive adjustment device is a hydraulic cylinder or a multi-stage electric cylinder. The top of the telescopic support column is equipped with a pressure sensor and an inclination sensor. During the vertical adjustment process, the remote control terminal controls the extension of the telescopic support column according to the support point elevation data extracted in step 3. When the top of the telescopic support column contacts the lower chord of the steel truss, the pressure sensor collects the contact pressure value and transmits it to the remote control terminal in real time. When the contact pressure value reaches the preset threshold, the remote control terminal automatically stops the vertical extension and sends a locking command. The hydraulic lock or mechanical locking mechanism built into the telescopic support column is activated to maintain the current extension of the telescopic support column. At the same time, the inclination sensor monitors the verticality of the telescopic support column. When the verticality deviation exceeds 0.5°, an alarm signal is issued.

[0015] Furthermore, in steps 8 and 9, the adaptation adjustment device is remotely adjusted using a mobile phone Bluetooth system.

[0016] Furthermore, in steps 8 and 9, the mobile phone Bluetooth system includes a Bluetooth communication module installed on the adaptive adjustment device and a control APP installed on the mobile phone. The Bluetooth communication module is electrically connected to the controller of the adaptive adjustment device. The controller is electrically connected to the drive motor of the horizontal moving base and the drive device of the telescopic support column, respectively. The control APP has a built-in database of coordinates of each support point extracted in step 3. The APP interface simultaneously displays the number of each adaptive adjustment device, the current horizontal coordinate, the current vertical elevation, the horizontal locking status, and the vertical locking status. After the operator selects one or multiple adaptive adjustment devices through the APP, they can send a horizontal movement command or a vertical telescopic command with one click to achieve group synchronous adjustment.

[0017] Furthermore, in step 8, before the adaptive adjustment device adjusts its horizontal position according to the coordinates, the remote control terminal compares the horizontal coordinates (x, y) of the support point extracted in step 3 with the installation position coordinates of each adaptive adjustment device on the temporary support frame, automatically determines the horizontal movement direction and movement distance of each adaptive adjustment device, and generates an independent horizontal movement path plan for each device. When there is a risk of interference between two or more adjacent adaptive adjustment devices during horizontal movement, the remote control terminal automatically adjusts the movement priority and drives each adaptive adjustment device to move horizontally to the target position in sequence from the outside to the inside.

[0018] Furthermore, after step 9 and before step 10, a support status verification step is also included: After all the adaptation adjustment devices have completed vertical adjustment, the remote control terminal sends a pressure holding test command to each adaptation adjustment device. The telescopic support column maintains its current elongation for a preset time. The pressure sensor at the top of each telescopic support column continuously collects the contact pressure value. The remote control terminal compares the pressure value collected by each pressure sensor with the theoretical support force value. If the deviation between the measured pressure value and the theoretical value exceeds the preset range, it is determined that the support point has a false support or over-support phenomenon. The remote control terminal automatically performs vertical fine adjustment of the adaptation adjustment device until the deviation between the measured pressure value and the theoretical value of all support points is within ±5%. After the verification is passed, the remote control terminal generates a support status confirmation report and stores it.

[0019] The beneficial effects of this application are: (1) Achieve precise positioning and automatic alignment of support points. By integrating the design coordinate diagram containing coordinate information with the BIM 3D model of the steel truss structure, the horizontal coordinates (x, y) and elevation data of each support point are accurately extracted using the projection method, and these coordinate data are directly input into the adaptive adjustment device. The adaptive adjustment device autonomously adjusts the horizontal position according to the coordinates, ensuring that the support force is vertically uniform, fundamentally solving the problem of support point positioning relying on manual measurement and large positioning deviation in traditional methods.

[0020] (2) Achieving bidirectional adaptive adjustment of the support device in both horizontal and vertical directions. The adaptive adjustment device has both a horizontally movable base and a telescopic support column, enabling precise movement and positioning in the horizontal direction (X and Y directions), while simultaneously achieving precise elevation adjustment in the vertical direction through the telescopic support column. The horizontally movable base is equipped with a bidirectional screw drive mechanism and an absolute encoder, achieving high-precision horizontal positioning at the ±1mm level through closed-loop comparison; the top of the telescopic support column is equipped with a pressure sensor and an inclination sensor to ensure that the support point is completely in close contact with the steel truss and that the verticality meets the requirements. This bidirectional adjustment capability enables the present invention to adapt to the support needs of various complex spatial steel structures.

[0021] (3) Realize remote intelligent control of temporary support. The adaptive adjustment device can be remotely adjusted using the Bluetooth system of a mobile phone. Operators can select one or multiple adaptive adjustment devices in batches through a mobile APP, and send horizontal movement commands or vertical extension commands with one click to achieve synchronous adjustment of the group. The APP interface displays the number, current coordinates, elevation and locking status of each device in real time, which greatly improves the efficiency and consistency of multi-point support collaborative adjustment.

[0022] (4) Automatic verification and closed-loop control of support status. After the vertical adjustment is completed, a support status verification step is added. The contact pressure of each support point is collected by pressure sensors and compared with the theoretical support force value. The system automatically identifies the phenomenon of false support or over-support and makes fine adjustments until the deviation between the measured pressure value and the theoretical value of all support points is within ±5%. This closed-loop control mechanism ensures that the force on each support point is uniform and effectively avoids the deformation of the steel truss or the instability of the support system caused by local overload or underload.

[0023] (5) Improved construction efficiency and reduced labor costs. The traditional on-site manual measurement and adjustment were transformed into digital coordinate extraction and remote automated adjustment based on the BIM model, which significantly reduced the operation time and manpower input for on-site measurement and layout and support adjustment. At the same time, the adaptive adjustment device can be reused in different engineering projects, which has good economic benefits and promotional application value.

[0024] The aforementioned main solution and its various further alternatives can be freely combined to form multiple solutions, all of which are solutions that can be adopted and are claimed in this application; furthermore, the (non-conflicting alternatives) can also be freely combined with each other and with other alternatives. Those skilled in the art, after understanding the solution of this application, will realize from the prior art and common general knowledge that there are many combinations, all of which are technical solutions to be protected by this application, and will not be exhaustively listed here. Attached Figure Description

[0025] Figure 1 This is a structural diagram of this application.

[0026] In the diagram: 1-temporary support frame, 2-adaptive adjustment device, 3-steel truss; 101-support column, 102-crossbar, 103-crossbar, 104-cantilever bar; 201-horizontal movable base, 202-telescopic support column. Detailed Implementation

[0027] The following non-limiting embodiments are used to illustrate this application.

[0028] Example 1 refer to Figure 1 As shown, a BIM-based temporary support system for steel structures includes a temporary support frame 1, an adaptive adjustment device 2, and a steel truss 3.

[0029] The temporary support frame 1 is equipped with several adaptive adjustment devices 2, which have horizontal movement and vertical extension functions, and support the steel truss 3.

[0030] The temporary support frame 1 includes support columns 101, crossbars 102, longitudinal bars 103, and cantilevered crossbars 104. Four support columns 101 are provided and erected at the four corners of a rectangle. Crossbars 102 are welded between the lower parts of the left and right support columns 101, and longitudinal bars 103 are welded between the upper parts of the front and rear support columns 101. Thus, the support columns 101, crossbars 102, and longitudinal bars 103 together form the overall support frame.

[0031] Cantilevered crossbars 104 are welded to the inner sides of the upper parts of the left and right support columns 101, with gaps between the opposing cantilevered crossbars 104 to allow for the arrangement of the steel truss 3 in the lower space. Adjustment devices 2 are provided on the front and rear crossbars 102 and the front and rear cantilevered crossbars 104, located at the upper left, upper right, and lower center positions, respectively, to support the steel truss 3 at their corresponding locations.

[0032] The adaptive adjustment device 2 includes a horizontally movable base 201 and a telescopic support column 202. The horizontally movable base 201 is fixedly mounted on the temporary support frame 1, and the telescopic support column 202 is horizontally movable and mounted on the horizontally movable base 201 to adjust its horizontal position. The telescopic support column 202 supports the steel truss 3 through its own extension and retraction to adjust its vertical position. The horizontally movable base 201 and the telescopic support column 202 work together to achieve adaptive adjustment support for the steel truss 3.

[0033] Example 2 refer to Figure 1 As shown, a BIM-based temporary support method for steel structures includes the following steps: Step 1, establish a steel truss structure model: Based on the design drawings, establish a BIM three-dimensional model of the steel truss structure.

[0034] Step 2, determine the location of temporary supports: Based on the BIM 3D model of the steel truss structure, determine the location of temporary supports in the model according to the length of the steel truss, load distribution and assembly node parameters.

[0035] Step 3, extract support point coordinates: merge the design coordinate map (general evaluation map) containing coordinate information with the BIM 3D model of the steel truss structure, and obtain the horizontal coordinates (x,y) of the support points through projection method.

[0036] Step 4, Establish a measurement control system: Based on the design drawings and on-site coordinate control points, establish measurement control axes for the steel truss and temporary supports.

[0037] Step 5, design and fabrication of temporary support frame 1.

[0038] Step 6, on-site installation of temporary support frame 1: Positioning and installation of temporary support frame 1 is carried out through the measurement and control system.

[0039] Step 7, Installation of the adaptation and adjustment device 2: Install the adaptation and adjustment device 2 between the temporary support frame 1 and the steel truss 3.

[0040] Step 8, Input support point coordinates: Input the coordinates of the temporary support point into the adaptation and adjustment device 2. The adaptation and adjustment device 2 adjusts its horizontal position according to the coordinates to ensure that the force is vertical and uniform. The horizontal position of the adaptation and adjustment device 2 is remotely self-locked.

[0041] Step 9, Vertical adjustment of the adaptation adjustment device 2: The vertical position of the adaptation adjustment device 2 is adjusted remotely, and the adaptation adjustment device 2 is extended to the elevation control point to ensure that the support point of the adaptation adjustment device 2 is completely in close contact with the steel truss 3.

[0042] Step 10: Assemble the steel truss.

[0043] In step 8, the horizontal moving base 201 of the adaptive adjustment device 2 is equipped with a bidirectional lead screw drive mechanism arranged along the X and Y directions. The bidirectional lead screw drive mechanism is driven by a servo motor, which integrates an absolute encoder. The absolute encoder collects the displacement data of the horizontal moving base 201 in real time and feeds it back to the remote control terminal. The remote control terminal performs a closed-loop comparison between the horizontal coordinates x, y of the support point extracted in step 3 and the real-time position data fed back by the absolute encoder. When the deviation exceeds ±1mm, the servo motor is automatically driven to perform fine-tuning compensation until the horizontal moving base 201 moves to the target coordinate position. After the horizontal position adjustment is completed, the remote control terminal sends a self-locking command to the bidirectional lead screw drive mechanism. The electromagnetic brake built into the drive mechanism is energized to hold the brake, realizing the self-locking fixation of the horizontal position.

[0044] In step 9, the telescopic support column 202 of the adaptive adjustment device 2 is a hydraulic cylinder or a multi-stage electric cylinder. The top of the telescopic support column 202 is equipped with a pressure sensor and an inclination sensor. During the vertical adjustment process, the remote control terminal controls the extension of the telescopic support column 202 according to the support point elevation data extracted in step 3. When the top of the telescopic support column 202 contacts the lower chord of the steel truss 3, the pressure sensor collects the contact pressure value and transmits it to the remote control terminal in real time. When the contact pressure value reaches the preset threshold, the remote control terminal automatically stops the vertical extension and sends a locking command. The hydraulic lock or mechanical locking mechanism built into the telescopic support column 202 is activated to maintain the current extension of the telescopic support column 202. At the same time, the inclination sensor monitors the verticality of the telescopic support column 202. When the verticality deviation exceeds 0.5°, an alarm signal is issued.

[0045] In steps 8 and 9, the adaptation adjustment device 2 is remotely adjusted using the mobile phone's Bluetooth system.

[0046] In steps 8 and 9, the mobile phone Bluetooth system includes a Bluetooth communication module installed on the adaptive adjustment device 2 and a control APP installed on the mobile phone. The Bluetooth communication module is electrically connected to the controller of the adaptive adjustment device 2. The controller is electrically connected to the drive motor of the horizontal moving base 201 and the drive device of the telescopic support column 202. The control APP has a built-in database of coordinates of each support point extracted in step 3. The APP interface simultaneously displays the number of each adaptive adjustment device 2, the current horizontal coordinate, the current vertical elevation, the horizontal locking status, and the vertical locking status. After the operator selects one or multiple adaptive adjustment devices 2 through the APP, they can send a horizontal movement command or a vertical telescopic command with one click to achieve group synchronous adjustment.

[0047] In step 8, before the adaptive adjustment device 2 adjusts its horizontal position according to the coordinates, the remote control terminal compares the horizontal coordinates x, y of the support point extracted in step 3 with the installation position coordinates of each adaptive adjustment device 2 on the temporary support frame 1, automatically determines the horizontal movement direction and movement distance of each adaptive adjustment device 2, and generates an independent horizontal movement path plan for each device. When there is a risk of interference between two or more adjacent adaptive adjustment devices 2 during horizontal movement, the remote control terminal automatically adjusts the movement priority and drives each adaptive adjustment device 2 to move horizontally to the target position in the order of first the outer side and then the inner side.

[0048] After step 9 and before step 10, a support status verification step is also included: After all the adaptation adjustment devices 2 have completed vertical adjustment, the remote control terminal sends a pressure holding test command to each adaptation adjustment device 2. The telescopic support column 202 maintains its current elongation for a preset time. The pressure sensor at the top of each telescopic support column 202 continuously collects the contact pressure value. The remote control terminal compares the pressure value collected by each pressure sensor with the theoretical support force value. If the deviation between the measured pressure value and the theoretical value exceeds the preset range, it is determined that the support point has a false support or over-support phenomenon. The remote control terminal automatically performs vertical fine adjustment of the adaptation adjustment device 2 until the deviation between the measured pressure value and the theoretical value of all support points is within ±5%. After the verification is passed, the remote control terminal generates a support status confirmation report and stores it.

[0049] The foregoing basic examples and their further alternative examples can be freely combined to form multiple embodiments, all of which are embodiments that can be adopted and claimed in this application. In the scheme of this application, each alternative example can be arbitrarily combined with any other basic example and alternative example.

[0050] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A BIM-based temporary support system for steel structures, comprising a temporary support frame (1), characterized in that: The temporary support frame (1) is equipped with several adaptive adjustment devices (2), which have horizontal movement and vertical extension functions, and support the steel truss (3).

2. The BIM-based temporary steel structure support system according to claim 1, characterized in that: The temporary support frame (1) includes support columns (101), crossbars (102), crossbars (103), and cantilevered crossbars (104). Crossbars (102) are provided between the lower parts of the support columns (101), crossbars (103) are provided between the upper parts of the support columns (101), and cantilevered crossbars (104) are provided on the inner sides of the upper parts of the support columns (101). Adjustment devices (2) are provided on the front and rear crossbars (102) and the front and rear cantilevered crossbars (104).

3. The BIM-based temporary steel structure support system according to claim 1 or 2, characterized in that: The adaptive adjustment device (2) includes a horizontally movable base (201) and a telescopic support column (202). The horizontally movable base (201) is mounted on a temporary support frame (1), and the telescopic support column (202) is mounted on the horizontally movable base (201) in a horizontal direction. The telescopic support column (202) supports the steel truss (3) by its own extension and retraction.

4. A BIM-based method for temporary support of steel structures, characterized in that, Includes the following steps: Step 1, Create a steel truss structure model: Based on the design drawings, create a BIM 3D model of the steel truss structure; Step 2, determine the location of temporary supports: Based on the BIM 3D model of the steel truss structure, determine the location of temporary supports in the model according to the length of the steel truss, load distribution and assembly node parameters; Step 3, extract support point coordinates: merge the design coordinate diagram containing coordinate information with the BIM 3D model of the steel truss structure, and obtain the horizontal coordinates (x, y) of the support points through projection. Step 4, Establish a measurement control system: Based on the design drawings and on-site coordinate control points, establish measurement control axes for the steel truss and temporary supports; Step 5, Design and fabrication of temporary support frame (1); Step 6, Temporary support frame (1) on-site installation: The temporary support frame (1) is positioned and installed using a measurement and control system; Step 7, Installation of the adaptation adjustment device (2): Install the adaptation adjustment device (2) between the temporary support frame (1) and the steel truss (3); Step 8, Input the coordinates of the support point: Input the coordinates of the temporary support point into the adaptation adjustment device (2). The adaptation adjustment device (2) adjusts the horizontal position according to the coordinates to ensure that the force is vertical and uniform. The horizontal position of the adaptation adjustment device (2) is remotely self-locked. Step 9, Vertical adjustment of the adaptation adjustment device (2): The vertical position of the adaptation adjustment device (2) is adjusted remotely, and the adaptation adjustment device (2) is extended to the elevation control point to ensure that the support point of the adaptation adjustment device (2) is completely in close contact with the steel truss (3); Step 10: Assemble the steel truss.

5. The BIM-based temporary support method for steel structures according to claim 4, characterized in that: In step 8, the horizontal moving base (201) of the adaptation adjustment device (2) is provided with a bidirectional screw drive mechanism arranged along the X and Y directions. The bidirectional screw drive mechanism is driven by a servo motor. The servo motor integrates an absolute encoder. The absolute encoder collects the displacement data of the horizontal moving base (201) in real time and feeds it back to the remote control terminal. The remote control terminal performs a closed-loop comparison between the horizontal coordinates (x, y) of the support point extracted in step 3 and the real-time position data fed back by the absolute encoder. When the deviation exceeds ±1mm, the servo motor is automatically driven to perform fine-tuning compensation until the horizontal moving base (201) moves to the target coordinate position. After the horizontal position is adjusted, the remote control terminal sends a self-locking command to the bidirectional screw drive mechanism. The electromagnetic brake built into the drive mechanism is energized to hold the brake, realizing the self-locking fixation of the horizontal position.

6. The BIM-based temporary support method for steel structures according to claim 4 or 5, characterized in that: In step 9, the telescopic support column (202) of the adaptive adjustment device (2) is a hydraulic cylinder or a multi-stage electric cylinder. The top of the telescopic support column (202) is equipped with a pressure sensor and an inclination sensor. During the vertical adjustment, the remote control terminal controls the telescopic support column (202) to extend according to the support point elevation data extracted in step 3. When the top of the telescopic support column (202) contacts the lower chord of the steel truss (3), the pressure sensor collects the contact pressure value and transmits it to the remote control terminal in real time. When the contact pressure value reaches the preset threshold, the remote control terminal automatically stops the vertical extension and sends a locking command. The hydraulic lock or mechanical locking mechanism built into the telescopic support column (202) is activated to maintain the current extension of the telescopic support column (202). At the same time, the inclination sensor monitors the verticality of the telescopic support column (202). When the verticality deviation exceeds 0.5°, an alarm signal is issued.

7. The BIM-based temporary support method for steel structures according to claim 4, characterized in that: In steps 8 and 9, the adaptive adjustment device (2) is remotely adjusted using the Bluetooth system of a mobile phone.

8. The BIM-based temporary support method for steel structures according to claim 7, characterized in that: In steps 8 and 9, the mobile phone Bluetooth system includes a Bluetooth communication module set on the adaptation adjustment device (2) and a control APP installed on the mobile phone. The Bluetooth communication module is electrically connected to the controller of the adaptation adjustment device (2). The controller is electrically connected to the drive motor of the horizontal moving base (201) and the drive device of the telescopic support column (202). The control APP has a built-in database of the coordinates of each support point extracted in step 3. The APP interface simultaneously displays the number of each adaptation adjustment device (2), the current horizontal coordinate, the current vertical elevation, the horizontal locking status and the vertical locking status. After the operator selects one or multiple adaptation adjustment devices (2) through the APP, he / she can send a horizontal movement command or a vertical telescopic command with one click to achieve group synchronous adjustment.

9. The BIM-based temporary support method for steel structures according to claim 4, characterized in that: In step 8, before the adaptive adjustment device (2) adjusts its horizontal position according to the coordinates, the remote control terminal compares the horizontal coordinates (x, y) of the support point extracted in step 3 with the installation position coordinates of each adaptive adjustment device (2) on the temporary support frame (1), automatically determines the horizontal movement direction and movement distance of each adaptive adjustment device (2), and generates an independent horizontal movement path plan for each device. When there is a risk of interference between two or more adjacent adaptive adjustment devices (2) during horizontal movement, the remote control terminal automatically adjusts the movement priority and drives each adaptive adjustment device (2) to move horizontally to the target position in the order of first the outer side and then the inner side.

10. The BIM-based temporary support method for steel structures according to claim 4, characterized in that: After step 9 and before step 10, a support status verification step is also included: After all the adaptation adjustment devices (2) have completed vertical adjustment, the remote control terminal sends a pressure holding test command to each adaptation adjustment device (2). The telescopic support column (202) maintains its current elongation for a preset time. The pressure sensor at the top of each telescopic support column (202) continuously collects the contact pressure value. The remote control terminal compares the pressure value collected by each pressure sensor with the theoretical support force value. If the deviation between the measured pressure value and the theoretical value exceeds the preset range, it is determined that the support point has a false support or over-support phenomenon. The remote control terminal automatically performs vertical fine adjustment on the adaptation adjustment device (2) until the deviation between the measured pressure value and the theoretical value of all support points is within ±5%. After the verification is passed, the remote control terminal generates a support status confirmation report and stores it.

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