BIM and positioning plate-based method for positioning of slow-bonding prestressed tendon

Abstract

The application discloses a kind of based on BIM and positioning plate's slow-bonding prestressed tendon positioning method, it is related to building engineering technical field, including the following steps: step one: based on BIM structure model generation stress tendon's three-dimensional coordinates, the position of positioning plate, and determine positioning plate parameter;Step two: install positioning plate, and the contour and welding point position of positioning plate are clearly projected on formwork surface by laser projector;Step three: the installation and adjustment of prestressed tendon;Step four: data management and acceptance, and the installation position of information equipment is uploaded to BIM collaborative platform by positioning plate, and the adjustment data of prestressed tendon is uploaded to BIM collaborative platform in real time, generates digital acceptance report.The application adopts the above-mentioned based on BIM and positioning plate's slow-bonding prestressed tendon positioning method, by the collaborative application of BIM technology and positioning plate, the installation accuracy of positioning plate is greatly improved, construction quality is significantly improved and rework rate is reduced, and material waste is reduced.

Description

Technical Field

[0001] This invention relates to the field of building engineering technology, and in particular to a method for positioning slow-bonding prestressed tendons based on BIM and positioning plates. Background Technology

[0002] Traditional prestressed tendon positioning methods rely on manual measurement and binding, which have the following problems: 1) Insufficient accuracy: Manual operation is prone to horizontal sway >50mm and vertical deviation >30mm, affecting the tensioning effect; 2) Low efficiency: Complex structures require repeated adjustments, extending the construction period by more than 30%; 3) Data loss: The construction process lacks real-time monitoring and traceability methods; 4) Frequent conflicts: When intersecting with ordinary steel bars and pipelines, multiple rework is required.

[0003] While existing technologies utilize BIM for design optimization, they fail to achieve dynamic linkage during the construction phase. Therefore, a systematic solution integrating BIM technology, high-precision positioning devices, and data management is urgently needed. Summary of the Invention

[0004] The purpose of this invention is to provide a method for positioning slow-bonding prestressed tendons based on BIM and positioning plates, which solves the problems of accuracy, efficiency and coordination in traditional construction and realizes full-process digital management.

[0005] To achieve the above objectives, this invention provides a method for positioning loosely bonded prestressed tendons based on BIM and a positioning plate, comprising the following steps:

[0006] Step 1: Generate the 3D coordinates of the stress tendons and the position of the positioning plate based on the BIM structural model, and determine the parameters of the positioning plate;

[0007] Step 2: Install the positioning plate. Use a laser projector to clearly project the outline of the positioning plate and the location of the welding points onto the template surface.

[0008] Step 3: Installation and adjustment of prestressing tendons. Install the slow-bonding prestressing tendons through the holes of the positioning plate, and adjust their position using a fine-tuning device to ensure that the horizontal sway is no more than 5mm and the vertical deviation is no more than 3mm.

[0009] Step 4: Data Management and Acceptance. Using information technology equipment, upload the installation position of the positioning plate and the adjustment data of the prestressing tendons to the BIM collaboration platform in real time to generate a digital acceptance report.

[0010] Preferably, in step one, the positioning plate is a 2mm thick Q235 steel plate with 6 symmetrically distributed positioning holes evenly arranged on it. The positioning holes are connected to the prestressing tendons, and the side of the positioning plate is welded to the structural steel bars.

[0011] Preferably, in step two, carbon dioxide shielded welding is used to weld the positioning plate to the structural steel bars, with a weld length of not less than 30mm and a weld height of not less than 3mm.

[0012] Preferably, in step two, the perpendicularity deviation between the positioning plate and the reinforcing bar is no greater than 2°.

[0013] Preferably, the fine-tuning device in step three is a gear transmission mechanism, which adjusts the position of the prestressing tendons by rotating the screw.

[0014] Preferably, the BIM modeling includes a conflict detection module to automatically optimize the intersection of the positioning plate with pipelines and reinforcing bars.

[0015] Therefore, the above-mentioned method for positioning loosely bonded prestressed tendons based on BIM and positioning plates has the following beneficial effects:

[0016] (1) Based on the visualization and precise modeling capabilities of BIM technology, this invention plans and optimizes the layout of the positioning plate in advance in the virtual environment to avoid conflicts with other components.

[0017] (2) The coordinates and angle information of the positioning plate are projected onto the construction surface by a laser projector, providing an intuitive and accurate positioning basis for the installation of the positioning plate. The position of the prestressing tendon is further precisely adjusted by a gear transmission fine adjustment device, which greatly improves the installation accuracy of the positioning plate, achieves a positioning deviation of ≤5mm, and increases the tensioning qualification rate to 100%.

[0018] (3) By using the BIM model to generate precise parameters of the positioning plate and the auxiliary use of the laser projector, the construction efficiency is optimized, the construction cycle is shortened by 40%, and the labor cost is reduced by 50%.

[0019] (4) By generating precise parameters of the positioning plate through the BIM model, material waste and rework are reduced, and the overall cost is reduced by 20%.

[0020] 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

[0021] Figure 1 This is a flowchart of a method for positioning loosely bonded prestressed tendons based on BIM and a positioning plate according to the present invention. Detailed Implementation

[0022] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0024] Example

[0025] Please see Figure 1 This invention provides a method for positioning loosely bonded prestressed tendons based on BIM and a positioning plate, comprising the following steps:

[0026] Step 1: Generate the 3D coordinates of the stress tendons and the position of the positioning plate based on the BIM structural model, and determine the positioning plate parameters; optimize the positioning plate layout using the conflict detection module of the BIM software to avoid areas where pipelines and reinforcement intersect. By constructing a 3D model including the bonded prestressing tendons and the positioning plate, the positioning plate layout can be planned and optimized in advance in the virtual environment to avoid conflicts with other components. The precise parameters of the positioning plate generated using the BIM model guide the fabrication of the positioning plate, ensuring that its dimensions and hole position accuracy meet the requirements.

[0027] The positioning plate is made of 2mm thick Q235 steel plate, with a size of 300mm×100mm, and has 6 symmetrical holes of Φ12mm with a hole spacing of 50mm.

[0028] Step Two: Install the positioning plate. Using a laser projector, clearly project the outline of the positioning plate and the welding point positions onto the template surface. Weld the positioning plate to the structural steel reinforcement using CO2 shielded welding, ensuring a weld length ≥30mm and a weld height ≥3mm, while maintaining a perpendicularity deviation of ≤2° between the positioning plate and the reinforcement. The laser projector projects the coordinates and angle information of the positioning plate from the BIM model onto the construction surface, providing a direct and accurate positioning reference for the installation of the positioning plate, significantly improving its installation accuracy. After the positioning plate is installed, its holes provide initial positioning for the installation of the bonded prestressing tendons, while the gear-driven fine-tuning device further precisely adjusts the position of the prestressing tendons to meet the design accuracy standards.

[0029] Step 3: Installation and adjustment of prestressing tendons. Install the slow-bonding prestressing tendons through the holes of the positioning plate, and adjust their position using a fine-tuning device to ensure that the horizontal sway is ≤5mm and the vertical deviation is ≤3mm.

[0030] Step 4: Data Management and Acceptance. Using information technology equipment, upload the installation position of the positioning plate and the adjustment data of the prestressing tendons to the BIM collaboration platform in real time to generate a digital acceptance report.

[0031] In a newly constructed high-rise residential project, some sections feature multiple large-span, loosely bonded prestressed beams, requiring high precision in the positioning of the prestressing tendons to ensure the structure's load-bearing capacity and stability. This embodiment details the application of a BIM-based, positioning plate-based loosely bonded prestressing tendon positioning method in this project.

[0032] BIM Modeling and Positioning Plate Preparation: Experienced BIM engineers use professional BIM software (such as Revit) to construct an accurate structural model based on the project's architectural structural design drawings. The model precisely marks the 3D coordinates of the bonded prestressing tendons, the position of the positioning plates, and welding joints. Using the BIM software's conflict detection module, the intersections of the positioning plates with various pipelines and ordinary reinforcing bars are carefully checked, and the layout of the positioning plates is optimized to avoid intersections and construction conflicts. Based on the positioning plate parameters generated from the BIM model, 2mm thick Q235 steel plates are selected to fabricate the positioning plates. The positioning plate dimensions are determined to be 300mm × 100mm, with six symmetrically distributed Φ12mm positioning holes evenly spaced at 50mm intervals. Suitable welding interfaces are reserved on the sides of the positioning plates to facilitate subsequent welding and fixing to the structural reinforcing bars.

[0033] Positioning plate installation: At the construction site, after the ordinary steel reinforcement of the loosely bonded prestressed beam is tied, the construction personnel export the coordinate and angle information of the positioning plate from the BIM model to a laser projector. The laser projector clearly projects the outline of the positioning plate and the welding point positions onto the template surface. Following the projected marks, the construction personnel use CO2 shielded welding to weld the positioning plate to the structural steel reinforcement. The welding process strictly follows specifications, ensuring a weld length ≥30mm, a weld height ≥3mm, and a perpendicularity deviation between the positioning plate and the steel reinforcement ≤2°. After welding, the weld is visually inspected to ensure there are no defects such as incomplete welds or missing welds.

[0034] Prestressing Tendon Installation and Adjustment: After the positioning plate is installed and inspected, the installation of the loosely bonded prestressing tendons begins. Workers thread the loosely bonded prestressing tendons through the holes in the positioning plate sequentially. During threading, a small amount of lubricant can be applied to reduce friction and ensure smooth passage. After threading, a gear-driven fine-tuning device is used to precisely adjust the position of the prestressing tendons. This device achieves fine-tuning of the tendon position by rotating a screw, with an accuracy of ±1mm. During adjustment, workers use high-precision measuring tools (such as a total station) to monitor the horizontal runout and vertical deviation of the prestressing tendons in real time, ensuring that the horizontal runout is ≤5mm and the vertical deviation is ≤3mm. If any deviation exceeds the allowable range, it is immediately adjusted using the fine-tuning device until the accuracy requirements are met.

[0035] Data Management and Acceptance: Throughout the construction process, information technology equipment on the construction site is used to upload construction data such as the installation position of the positioning plates and the adjustment data of the prestressing tendons to the BIM collaboration platform in real time. This data is updated in real time in the BIM model, allowing construction and management personnel to easily view the construction progress and quality status. After construction is completed, a digital acceptance report is automatically generated using the BIM collaboration platform. The report covers all key data during the construction process, quality inspection results, etc., providing comprehensive and accurate data support for project acceptance.

[0036] Construction data is uploaded to the BIM collaboration platform in real time, enabling digital management of the construction process. On the one hand, this allows construction personnel to keep abreast of the construction progress and quickly address any problems that arise; on the other hand, it provides a data foundation for the generation of digital acceptance reports, ensuring that the acceptance process is scientific, fair, and accurate, and achieving full-process digital management of the positioning construction of the slow-bonded prestressed tendons.

[0037] Therefore, this invention employs the aforementioned BIM-based method for positioning prestressed tendons using a positioning plate. Leveraging the visualization and precise modeling capabilities of BIM technology, this invention pre-plans and optimizes the layout of the positioning plate in a virtual environment, avoiding conflicts with other components. A laser projector projects the coordinates and angles of the positioning plate onto the construction surface, providing an intuitive and accurate positioning basis for the installation of the positioning plate. A gear-driven fine-tuning device further precisely adjusts the position of the prestressed tendons, significantly improving the installation accuracy of the positioning plate, achieving a positioning deviation of ≤5mm and increasing the tensioning pass rate to 100%. By utilizing the precise parameters of the positioning plate generated from the BIM model and the assistance of the laser projector, construction efficiency is optimized, shortening the construction cycle by 40% and reducing labor costs by 50%. Generating precise parameters of the positioning plate through the BIM model reduces material waste and rework, resulting in a 20% reduction in overall costs.

[0038] 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 method for positioning loosely bonded prestressed tendons based on BIM and a positioning plate, characterized in that, Includes the following steps: Step 1: Generate the 3D coordinates of the stress tendons and the position of the positioning plate based on the BIM structural model, and determine the parameters of the positioning plate; Step 2: Install the positioning plate. Use a laser projector to clearly project the outline of the positioning plate and the location of the welding points onto the template surface. Step 3: Installation and adjustment of prestressing tendons. Install the slow-bonding prestressing tendons through the holes of the positioning plate, and adjust their position using a fine-tuning device to ensure that the horizontal sway is no more than 5mm and the vertical deviation is no more than 3mm. Step 4: Data Management and Acceptance. Use information technology equipment to upload the installation position of the positioning plate and the adjustment data of the prestressing tendons to the BIM collaboration platform in real time to generate a digital acceptance report. BIM modeling includes a conflict detection module that automatically optimizes the intersection of the positioning plate with pipelines and rebar. In step one, the positioning plate is a 2mm thick Q235 steel plate. There are 6 symmetrically distributed positioning holes evenly arranged on the positioning plate. The positioning holes are connected to the prestressing tendons, and the side of the positioning plate is welded to the structural steel bars. In step three, the fine-tuning device is a gear transmission mechanism that adjusts the position of the prestressing tendons by rotating the screw.

2. The method for positioning loosely bonded prestressed tendons based on BIM and a positioning plate according to claim 1, characterized in that: In step two, carbon dioxide shielded welding is used to weld the positioning plate to the structural steel bars. The weld length is not less than 30mm and the weld height is not less than 3mm.

3. The method for positioning loosely bonded prestressed tendons based on BIM and a positioning plate according to claim 2, characterized in that: In step two, the perpendicularity deviation between the positioning plate and the reinforcing bar should not exceed 2°.

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