A BIM-based steel bar construction positioning method

Abstract

The present invention discloses a BIM-based steel bar construction positioning method, belonging to the field of building construction design, which includes establishing a three-dimensional BIM model of a steel bar mesh according to the structural design parameters of a building and constructing a three-dimensional coordinate system on the three-dimensional BIM model; calculating the distance between any two adjacent connection points on the same steel bar based on their coordinates; calculating the theoretical space widths on both sides of the connection points; judging the size relationship between the theoretical space width and the space width, and calculating the distance that the connection point needs to move; constructing the straight line equation of the straight line where each steel bar is located, and calculating the coordinates of the connection point after movement; setting the strain constraint conditions for correcting the connection point position, correcting the positions of the steel bars in the steel bar mesh based on the strain constraint conditions, and outputting the construction drawings of the steel bar mesh. The present invention is used to optimize the design layout of the steel bars in a reinforced concrete wall body. Precise construction positioning reduces material waste and the increase in labor costs, and improves the structural safety and durability of the overall wall project.

Description

Technical Field

[0001] The present invention relates to the field of building construction design, and particularly relates to a method for positioning steel bars during construction based on BIM. Background Art

[0002] In the field of housing construction, due to the complex requirements for functionality, aesthetics, and structural stability, a large number of steel bar meshes need to be reserved in the structural walls as supports. During the early construction process, the deviation of the steel bar positions will seriously affect the strength of the wall structure, and the reasonable arrangement of the distribution and density of the steel bars in the steel bar mesh is very helpful for cost savings. When constructing structural steel bars, the measurement accuracy is low and the construction error is large, so it is impossible to accurately position and tie the structural steel bars, and it is impossible to predict the impact of the steel bar position deviation on the subsequent installation project construction. Therefore, there is an urgent need to propose a method for positioning steel bars during construction based on BIM. Summary of the Invention

[0003] Aiming at the above deficiencies of the prior art, the present invention provides a method for positioning steel bars during construction based on BIM, aiming to improve construction efficiency, reduce errors, and ensure the accuracy of steel bar positions.

[0004] To achieve the above invention purpose, the technical solution adopted by the present invention is as follows:

[0005] Provide a method for positioning steel bars during construction based on BIM, which includes the following steps:

[0006] S1: Establish a three-dimensional BIM model of the steel bar mesh according to the structural design parameters of the building, construct a three-dimensional coordinate system on the three-dimensional BIM model, and extract the coordinates of the connection points between the steel bars in the steel bar mesh in the three-dimensional coordinate system ; u is the number of the steel bar in the steel bar mesh, i is the steel bar u is the number of the connection point on the steel bar;

[0007] S2: Calculate the distance between the connection points based on the coordinates of any two adjacent connection points on the same steel bar;

[0008] ;

[0009] Among them, is the steel bar u adjacent to the connection point i is the connection point m of the coordinates;

[0010] S3: As the space width i between the connection point m and the connection point , then, obtain the steel bar i provided on the connection point vRadius Calculate the theoretical space width on both sides of the connection point i D i , is the spacing distance designed for the steel bar v ;

[0011] S4: Determine the size of the space width and the theoretical space width D i ;

[0012] If , move the connection point m along the steel bar u towards the connection point i by a distance ;

[0013] If , move the connection point m along the steel bar u away from the connection point i by a distance ;

[0014] S5: Establish the linear equation of the straight line where the steel bar u is located according to the coordinates of the two end points , of the steel bar u ;

[0015] ;

[0016] S6: Calculate the coordinates m after the movement of the connection point according to the linear equation, and correct the position of the connection point m . The position after the movement of the connection point m is the connection point m 1;

[0017] ;

[0018] S7: Repeat steps S2 - S6, correct the positions of the connection points on the steel bars in sequence from one end of the steel bar to the other end, and satisfy the strain constraint conditions for the steel bar mesh to form a concrete wall. After all the connection points on all the steel bars in the steel bar mesh are corrected, output the construction drawings of the steel bar mesh.

[0019] Furthermore, the strain constraint conditions are:

[0020] ; and

[0021] ; ​​

[0022] Among them, t 0 is the service life of the concrete wall, A is the stress-bearing area of the concrete wall, b is the width of the cross-section of the concrete wall, h is the height of the cross-section of the concrete wall, is the strain function, indicating the stress change situation of the steel bars and concrete caused by the deformation of the concrete wall, k 0 is the strain threshold, i 1, i 2 are respectively the connection point numbers of the steel bars at the positions of the two opposite side lengths on the cross-section of the steel bar mesh, is the connection point on the steel bar on one side, i 1 is the coordinate of the connection point, is the connection point on the steel bar on the other side, i 2 is the coordinate of the connection point, I 1, I 2 are respectively the numbers of connection points of the steel bars at the positions of the two opposite side lengths on the cross-section of the steel bar mesh, H is the designed thickness of the surface of the concrete wall from the surface of the steel bar mesh.

[0023] The beneficial effects of the present invention are as follows: The present invention is used to optimize the design layout of the steel bars in the reinforced concrete wall body, correct the connection positions of each steel bar by using BIM technology and data calculation, ensure that the output construction drawings are accurate enough, and achieve efficient and precise positioning of steel bar construction. The precise positioning of steel bar construction reduces the rework and correction time caused by inaccurate positions; reduces the construction cost. The precise construction positioning reduces the waste of materials and the increase of labor costs, and improves the structural safety and durability of the overall wall project. Description of the Drawings

[0024] Figure 1 is the flow chart of the steel bar construction positioning method based on BIM. Specific Embodiments

[0025] The following describes the specific embodiments of the present invention to facilitate those skilled in the art of the present technology to understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific embodiments. For those ordinary skilled in the art of the present technology, as long as various changes are within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions and creations using the concept of the present invention are within the scope of protection.

[0026] As Figure 1 shown, a steel bar construction positioning method based on BIM includes the following steps:

[0027] S1: Establish a three-dimensional BIM model of the steel bar mesh according to the structural design parameters of the building, construct a three-dimensional coordinate system on the three-dimensional BIM model, and extract the coordinates of the connection points between the steel bars in the three-dimensional coordinate system. ; u is the number of the steel bar in the steel bar mesh, i is the steel bar u The connection point number on it;

[0028] During the construction of the building wall, first set up the steel bar mesh, which is built by several steel bars, and then welded and fixed. The steel bars can effectively improve the quality and strength of the building wall. When the layout of the steel bars is unreasonable or there are large deviations, it will inevitably affect the quality of the building wall. Therefore, during the design process, it is necessary to correct the relative positions of the steel bars and optimize the layout and density of the steel bars.

[0029] S2: Calculate the distance between any two adjacent connection points on the same steel bar based on their coordinates;

[0030] ;

[0031] Among them, is the steel bar u The connection point adjacent to the connection point i m Coordinates;

[0032] S3: As the space width i between the connection point m , then, obtain the radius of the steel bar i set on the connection point v , calculate the theoretical space widths on both sides of the connection point i D i , , is the designed spacing distance of the steel bar v ;

[0033] S4: Judge the size of the space width and the theoretical space width D i ;

[0034] If , then move the connection point m along the steel bar u towards the connection point i by a distance ;

[0035] If , then move the connection point mAlong the steel bars u Away from the connection point i Moving distance ;

[0036] Layout the intervals between the steel bars according to different steel bar sizes in the steel bar mesh to ensure the rationality of the steel bar layout.

[0037] S5: According to the steel bars u The coordinates of the two end points , Establish the linear equation of the straight line where the steel bar u is located;

[0038] ;

[0039] S6: Calculate the coordinates after the movement of the connection point m according to the linear equation, and correct the position of the connection point . The position after the movement of the connection point m is the connection point m 1; m 1;

[0040] ;

[0041] S7: Repeat steps S2 - S6, sequentially correct the positions of the connection points on the steel bars from one end of the steel bar to the other end, and satisfy the strain constraint conditions for the steel bar mesh to form a concrete wall. After all the connection points on all the steel bars in the steel bar mesh are corrected, output the construction drawings of the steel bar mesh.

[0042] The strain constraint conditions are:

[0043] ; and

[0044] ;

[0045] Among them, t 0 is the service life of the concrete wall, A is the stress - bearing area of the concrete wall, b is the width of the cross - section of the concrete wall, h is the height of the cross - section of the concrete wall, is the strain function, indicating the stress change situation caused by the deformation of the concrete wall to the steel bars and concrete, k 0 is the strain threshold, i 1, i 2 are respectively the connection point numbers on the steel bars at the positions of two opposite side lengths on the cross - section of the steel bar mesh, is the coordinate of the connection point i 1 on one side of the steel bar, is the coordinate of the connection point iThe coordinates of 2 I 1. I 2 are respectively the number of connection points on the steel bars at the positions of two opposite side lengths on the cross-section of the steel bar mesh H is the designed thickness of the concrete wall surface from the steel bar mesh surface.

[0046] The present invention is used to optimize the design layout of steel bars in a reinforced concrete wall, correct the connection positions of each steel bar by using BIM technology and data calculation, ensure that the output construction drawings are accurate enough, and achieve efficient and precise positioning of steel bar construction. The precise positioning of steel bar construction reduces the rework and correction time caused by inaccurate positions; reduces the construction cost. The precise construction positioning reduces the waste of materials and the increase of labor costs, and improves the structural safety and durability of the overall wall project.

Claims

1. A BIM-based steel bar construction positioning method, characterized in that: The following steps are involved: S1: Establish a 3D BIM model of the steel mesh according to the structural design parameters of the building, construct a 3D coordinate system on the 3D BIM model, and extract the coordinates of the connection points between the steel bars in the steel mesh in the 3D coordinate system ; u is the number of the steel bars in the steel mesh. i For steel bars u The connection point number on ; S2: Calculate the distance between connection points based on the coordinates of any two adjacent connection points on the same steel bar; ； in, For steel bars u On and connection point i Adjacent connection points m The coordinates of S3: As a connection point i With connection point m The width of the space between , then get the connection point i Steel bars installed on v Radius , calculate the connection points i Theoretical space width on both sides D i , , For steel bars v Designed spacing distance; S4: Determine the width of the space Theoretical space width D i size; like , then connect the points m Along the steel bars u To the connection point i Moving distance ; like , then connect the points m Along the steel bars u Departure from the connection point i Moving distance ; S5: According to the steel bar u Coordinates of the two endpoints , Create reinforcement u The linear equation of the line on which it lies; ； S6: Calculate connection points based on line equations m Coordinates after moving , for the connection point m The position of the connection point is corrected m The position after moving is the connection point m 1; ； S7: Repeat steps S2-S6 to correct the connection point positions on the steel bars from one end to the other end of the steel bars in sequence, and satisfy the strain constraint conditions for the steel mesh to form a concrete wall. After all the connection points on the steel bars in the steel mesh are corrected, the construction drawings of the steel mesh are output.

2. The BIM-based steel bar construction positioning method according to claim 1, characterized in that: The strain constraint condition is: ;and ； in, t 0 is the service life of the concrete wall, A is the bearing area of ​​the concrete wall, b is the width of the concrete wall section, h is the height of the concrete wall section, is the strain function, which indicates the stress change of the steel bars and concrete caused by the deformation of the concrete wall. k 0 is the strain threshold, i 1. i 2 are the connection point numbers on the steel bars at the locations of the two opposite sides on the steel mesh section. The connection point on one side of the reinforcement i The coordinates of 1, The connection point on the other side of the reinforcement i 2 coordinates, I 1. I 2 are the number of connection points on the steel bars at the locations of two opposite sides on the steel mesh section, H It is the design thickness from the concrete wall surface to the steel mesh surface.

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