Large-span net rack structure high-precision positioning and installation method

Abstract

The application provides a large-span net rack structure high-precision positioning and installation method, and belongs to the technical field of large-span net rack installation. The large-span net rack structure high-precision positioning and installation method comprises the following steps: comparing the design size with the actual size of the first net rack; preliminarily hoisting the first net rack and analyzing the hoisting condition; high-precision adjusting the first net rack; solidifying and installing the first net rack; and sequentially splicing and installing subsequent net racks. The operation steps for sequentially splicing and installing the subsequent net racks are the same as those in the installation method of the first net rack. The size of the first net rack before hoisting is compared, and the positions of the four corner points are actually measured and compared with the positions of the corresponding corner points in the design drawing in real time during the hoisting process. The large-span net rack can be installed with high precision, and the installed large-span net rack can easily meet the design requirements.

Description

Technical Field

[0001] This invention belongs to the field of large-span space frame installation technology, specifically, it relates to a high-precision positioning and installation method for large-span space frame structures. Background Technology

[0002] Large-span space frame structures, as the name suggests, refer to mesh structures capable of spanning large distances. The emergence of this structural form stems from people's pursuit and demands for architectural space. Traditional building structures often require a large number of columns and beams to support the building, which not only occupies valuable space but also affects the building's aesthetics. Large-span space frame structures, relying on their unique mesh structure, can achieve buildings with larger spans without excessive supports, thus making the building space more open and bright, better meeting people's pursuit of architectural aesthetics. They also have advantages such as high strength, energy efficiency, environmental friendliness, flexibility, and convenient maintenance. Large-span space frame structures are a building structure form with high application value and development prospects, and will be more widely used and promoted in the future.

[0003] Steel structures are widely used in large-span roof structures due to their light weight and structural stability. However, with the continuous development of building structures in my country, various super-large-span structures have gradually emerged. Therefore, when steel structures are used in large-span roofs, the combined deformation caused by factors such as temperature and span makes it difficult to meet the design accuracy requirements during the assembly of large-span space frames. Current construction techniques for large-span space frame structures mainly rely on total stations for correction during hoisting to control the accuracy of adjacent space frame splicing. This method primarily relies on surveyors and space frame installers to control accuracy during hoisting and installation, but it's impossible to confirm whether the actual accuracy is within the design range. Furthermore, the large span of steel space frames leads to significant curvature changes during installation, and the material properties of steel structures cause deformation during cutting, installation, and under load. These factors result in large deviations between the roof structure space frame and the design and layout, ultimately making it difficult to control the splicing error accuracy of the steel space frame, which is the main load-bearing structure, within the design requirements during hoisting and assembly. Summary of the Invention

[0004] In view of this, the present invention proposes a high-precision positioning and installation method for large-span space frame structures, which can install large-span space frames with high precision, and the installed large-span space frames can easily meet design requirements.

[0005] This invention is implemented as follows:

[0006] This invention provides a high-precision positioning and installation method for a large-span space frame structure, comprising the following steps:

[0007] S1. Verify the design dimensions of the first section of the space frame with the actual dimensions;

[0008] S2. Conduct preliminary hoisting of the first section of the space frame and analyze the hoisting situation;

[0009] S3. Perform high-precision adjustment on the first section of the space frame;

[0010] S4. Secure the first section of the space frame;

[0011] S5. The subsequent space frame is spliced ​​and installed sequentially.

[0012] Based on the above technical solution, the high-precision positioning and installation method for a large-span space frame structure of the present invention can be further improved as follows:

[0013] The specific steps for calibrating the design dimensions of the first section of the space frame with the actual dimensions are as follows:

[0014] Select the corner points located at the four corners of the first section of the space frame, find the specific positions of the four corner points on the design drawings and their specific positions in the actual first section of the space frame, calculate the positions and dimensions of the four corner points in the design drawings, measure the positions and dimensions of the four corner points in the actual first section of the space frame, and adjust and fix the bolts and nuts on the downspin ball joints located at the four corner points on the first section of the frame so that the positions and dimensions of the four corner points in the actual first section of the space frame are the same as the positions and dimensions of the four corner points in the design drawings.

[0015] Before hoisting the first large-span space frame, the actual dimensions of the space frame were corrected to the design dimensions, providing a necessary prerequisite for the high-precision installation of the subsequent space frame hoisting.

[0016] Furthermore, the specific operational steps for the preliminary hoisting and hoisting analysis of the first section of the space frame are as follows:

[0017] The first section of the space frame is hoisted and placed on the limiting slipper at the installation position on the roof. The actual coordinate values ​​of the four corner points of the first section of the space frame are collected using a total station. Based on the actual coordinate values, a measured drawing is drawn on the design drawings. The fit between the measured drawing and the design drawing is compared. The measured drawing is then adjusted by translation, rotation, etc., on the design drawings to maximize the overlap between the two elliptical arcs of the measured drawing and the inner and outer edges of the design drawing. The fitted coordinate values ​​of the measured drawing under the condition of maximum overlap are then obtained.

[0018] After the initial hoisting, the surveying engineer used a total station to measure the four corner points and compare them with the design drawings, so that the on-site adjustments were based on evidence.

[0019] Furthermore, the specific operational steps for performing high-precision adjustment on the first section of the space frame are as follows:

[0020] The actual coordinates of the four corner points of the first section of the space frame are collected in real time by a total station. The first section of the space frame is slowly adjusted along the axis by using limit slippers. The space frame is then finely adjusted vertically by using jacks. The actual coordinates are made to approach the fitted coordinates and the error between them is finally within the design error range.

[0021] The position, elevation, and angle of the first section of the space frame are precisely controlled by using limit slippers and existing jacks.

[0022] Furthermore, the specific operational steps for the fixed installation of the first section of the space frame are as follows:

[0023] Lift the jack, remove the limiting slipper, place a temporary support structure between the bottom of the first section of the space frame and the top of the installation position, and adjust the top height of the temporary support structure so that the height of the top of the temporary support structure corresponds to the height of the pre-contact point of the first section of the space frame above it in the design drawings.

[0024] Lower the jacks to place the first section of the space frame onto the temporary support structure. Check whether the actual coordinate values ​​of the four corner points of the first section of the space frame are the same as the fitted coordinate values. If they are the same, install fixed hinge supports at the bottom of the first section of the space frame to fix it. After fixing, remove the temporary support structure and the jacks. If not, raise the jacks, adjust the top height of the temporary support structure again, and then lower the jacks to place the first section of the space frame onto the temporary support structure. Check again.

[0025] Temporary support structures are erected, and the sliding shoes are removed to facilitate their reuse during subsequent hoisting of the space frame, thus saving construction materials. Fixed supports are then erected to complete the overall fixation of the space frame.

[0026] Furthermore, the specific steps for sequentially splicing and installing subsequent space frames are as follows: all subsequent space frame structures are installed using the same method as the first segment of the space frame.

[0027] Furthermore, the specific structure of the limiting slipper includes: an I-beam, a sliding structure, a retaining beam structure, and a retaining beam top plate; the retaining beam structure is slidably connected to the upper part of the I-beam, the sliding structure is disposed between the top of the I-beam and the inner top wall of the retaining beam structure, and the retaining beam top plate is fixedly disposed on the top of the retaining beam structure.

[0028] By setting up I-beams and erecting them at the locations where the load-bearing space frame structure needs to be installed, and by placing the space frame structure on the top plate of the supporting beam, and setting a sliding structure between the supporting beam structure and the I-beam, the supporting beam structure, the top plate of the supporting beam, and the space frame structure on the top plate of the supporting beam can slide along the I-beam, thereby achieving axial adjustment of the space frame structure.

[0029] Furthermore, the specific structure of the temporary support structure includes: a support base and a gasket. The gasket is placed on the upper part of the support base. The top of the support base is provided with a rectangular recess. The bottom of the gasket is provided with a rectangular protrusion that matches the rectangular recess on the top of the support base. The top of the gasket is also provided with a rectangular recess that is the same as the rectangular recess on the top of the support base. The support base and multiple gaskets are stacked by the rectangular recess and the rectangular protrusion fitting together.

[0030] The support base and the side of the gasket are provided with through holes at corresponding positions. A pin is inserted into the through hole on the side of the support base. The pin is used to pass through the through hole on the side of the gasket to connect multiple gaskets.

[0031] A connecting nail is fixedly installed on the side wall of the support base, and the connecting nail is connected to the pin through a connecting rope.

[0032] By incorporating shims to adjust the height of the temporary support structure, and by setting rectangular recesses and convexes, not only can the shims be fitted together to prevent slippage between themselves or between the shims and the top of the support base, but the through holes and pins allow for further fixation of the shims by inserting the pins through the through holes. Furthermore, the rectangular shape of the recesses and convexes ensures that the through holes are aligned when the convex and recesses are fitted together, facilitating the insertion of the pins. Connecting pins and connecting ropes are used to connect the pins to the support base, preventing the pins from falling off during use and causing inconvenience.

[0033] Furthermore, the specific structure of the underspin ball node includes: an underspin ball, a chord, and a high-strength bolt. A sealing plate is provided inside the end of the chord. One end of the high-strength bolt is threadedly connected to the threaded hole on the underspin ball, and the other end of the high-strength bolt is threadedly connected to the sealing plate. A hexagonal sleeve is fitted around the outside of the high-strength bolt.

[0034] Furthermore, the specific steps for adjusting and fixing the bolts and nuts on the downspin ball nodes located at the four corner points of the first frame are as follows: Adjust the relative distance between the downspin ball and the chord by threading the high-strength bolt with the threaded hole on the downspin ball and with the threaded bolt on the sealing plate, so that the downspin ball is in a suitable position, thus completing the adjustment; then, insert a pin into the hexagonal sleeve to engage the hexagonal sleeve with the high-strength bolt; then, weld the end of the hexagonal sleeve near the downspin ball to the downspin ball, and weld the end of the hexagonal sleeve near the chord to complete the fixing.

[0035] Compared with existing technologies, the beneficial effects of the high-precision positioning and installation method for large-span space frame structures provided by this invention are as follows: Before hoisting, the actual dimensions of the first large-span space frame are corrected to the design dimensions, providing a necessary prerequisite for high-precision installation of the subsequent space frame; after preliminary hoisting, surveying engineers compare the measurements of the four corner points with the design drawings using a total station, ensuring that on-site adjustments are based on evidence; high-precision control of the position, elevation, and angle of the first space frame along the axial direction is achieved through limit slippers and existing jacks; and the installed large-span space frame easily meets design requirements. Attached Figure Description

[0036] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 A flowchart illustrating a high-precision positioning and installation method for a large-span space frame structure;

[0038] Figure 2 Layout diagram of the space frame regulator;

[0039] Figure 3 This is a schematic diagram of the limiting slipper structure;

[0040] Figure 4 This is a schematic diagram of a temporary support structure;

[0041] Figure 5 This is a cross-sectional view of the temporary support structure;

[0042] Figure 6 This is a schematic diagram of the nodal point of a backspin ball;

[0043] Figure 7 This is a cross-sectional view of the point of inversion.

[0044] Figure 8 This is a reference image showing the actual process of hoisting the space frame.

[0045] Figure 9 This is a reference image of the completed space frame assembly.

[0046] The attached diagram lists the components represented by each number as follows:

[0047] 1. I-beam; 2. Sliding structure; 3. Beam-mounted structure; 4. Beam-mounted top plate; 5. Support seat; 51. Pin; 52. Connecting nail; 53. Connecting rope; 6. Washer; 7. Backspin ball; 8. Stringer; 81. Hexagonal sleeve; 82. Sealing plate; 9. High-strength bolt. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0050] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0051] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0052] like Figure 1 The diagram shown is a flowchart of a high-precision positioning and installation method for a large-span space frame structure provided by the present invention, including the following steps:

[0053] S1. Verify the design dimensions of the first section of the space frame with the actual dimensions;

[0054] S2. Conduct preliminary hoisting of the first section of the space frame and analyze the hoisting situation;

[0055] S3. Perform high-precision adjustment on the first section of the space frame;

[0056] S4. Secure the first section of the space frame;

[0057] S5. The subsequent space frame is spliced ​​and installed sequentially.

[0058] like Figure 2 The diagram shown is a layout diagram of the space frame adjusters, where black dots represent the positions of corner points;

[0059] In the above technical solution, the specific steps for verifying the design dimensions and actual dimensions of the first section of the space frame are as follows:

[0060] Select the corner points located at the four corners of the first section of the space frame, find the specific positions of the four corner points on the design drawings and their specific positions in the actual first section of the space frame, calculate the positions and dimensions of the four corner points in the design drawings, measure the positions and dimensions of the four corner points in the actual first section of the space frame, and adjust and fix the bolts and nuts on the downspin ball joints located at the four corner points on the first section of the frame so that the positions and dimensions of the four corner points in the actual first section of the space frame are the same as the positions and dimensions of the four corner points in the design drawings.

[0061] Furthermore, in the above technical solution, the specific operational steps for the preliminary hoisting and hoisting analysis of the first section of the space frame are as follows:

[0062] The first section of the space frame is hoisted and placed on the limiting slipper at the installation position on the roof. The actual coordinate values ​​of the four corner points of the first section of the space frame are collected using a total station. Based on the actual coordinate values, a measured drawing is drawn on the design drawings. The fit between the measured drawing and the design drawing is compared. The measured drawing is then adjusted by translation, rotation, etc., on the design drawings to maximize the overlap between the two elliptical arcs of the measured drawing and the inner and outer edges of the design drawing. The fitted coordinate values ​​of the measured drawing under the condition of maximum overlap are then obtained.

[0063] Furthermore, in the above technical solution, the specific operational steps for high-precision adjustment of the first section of the space frame are as follows:

[0064] The actual coordinates of the four corner points of the first section of the space frame are collected in real time by a total station. The first section of the space frame is slowly adjusted along the axis by using limit slippers. The space frame is then finely adjusted vertically by using jacks. The actual coordinates are made to approach the fitted coordinates and the error between them is finally within the design error range.

[0065] Furthermore, in the above technical solution, the specific operational steps for the fixed installation of the first section of the space frame are as follows:

[0066] Lift the jack, remove the limiting slipper, place a temporary support structure between the bottom of the first section of the space frame and the top of the installation position, and adjust the top height of the temporary support structure so that the height of the top of the temporary support structure corresponds to the height of the pre-contact point of the first section of the space frame above it in the design drawings.

[0067] Lower the jacks to place the first section of the space frame onto the temporary support structure. Check whether the actual coordinate values ​​of the four corner points of the first section of the space frame are the same as the fitted coordinate values. If they are the same, install fixed hinge supports at the bottom of the first section of the space frame to fix it. After fixing, remove the temporary support structure and the jacks. If not, raise the jacks, adjust the top height of the temporary support structure again, and then lower the jacks to place the first section of the space frame onto the temporary support structure. Check again.

[0068] Furthermore, in the above technical solution, the specific operation steps for sequentially splicing and installing the subsequent space frame are as follows: the subsequent space frame structures are all installed using the same method as the first section of the space frame.

[0069] like Figure 3 As shown, in the above technical solution, the specific structure of the limiting slipper includes: I-beam 1, sliding structure 2, clamping beam structure 3, and clamping beam top plate 4; the clamping beam structure 3 is slidably connected to the upper part of the I-beam 1, the sliding structure 2 is set between the top of the I-beam 1 and the inner top wall of the clamping beam structure 3, and the clamping beam top plate 4 is fixedly set on the top of the clamping beam structure 3.

[0070] In use, the I-beam 1 is erected at the location where the load-bearing space frame structure needs to be installed, and the space frame structure is placed on the top plate 4 of the beam. When the space frame structure is pushed, the top plate 4 of the beam supports the space frame structure and moves along the I-beam 1 through the sliding structure 2.

[0071] like Figure 4-5 As shown, in the above technical solution, the specific structure of the temporary support structure includes: a support base 5 and a pad 6. The pad 6 is placed on the upper part of the support base 5. The top of the support base 5 is provided with a rectangular recess. The bottom of the pad 6 is provided with a rectangular protrusion that matches the rectangular recess on the top of the support base 5. The top of the pad 6 is also provided with a rectangular recess that is the same as the rectangular recess on the top of the support base 5. The support base 5 and multiple pads 6 are stacked by the rectangular recess and the rectangular protrusion fitting together.

[0072] The support base 5 and the gasket 6 are provided with through holes at corresponding positions on their sides. A pin 51 is inserted into the through hole on the side of the support base 5. The pin 51 is used to pass through the through hole on the side of the gasket 6 to connect multiple gaskets 6.

[0073] A connecting nail 52 is fixedly installed on the side wall of the support base 5, and the connecting nail 52 is connected to the pin 51 through the connecting rope 53.

[0074] Before adding or removing the shims 6, first remove the pin 51, then add or remove the shims 6 above the support base 5 to adjust the height of the temporary support structure. After adjustment, insert the pin 51 through the through hole on the side of the support base 5 and the shim 6. At this time, the shim 6 is inserted and fixed.

[0075] like Figure 6-7 As shown, in the above technical solution, the specific structure of the underspin ball node includes: underspin ball 7, chord 8, and high-strength bolt 9. A sealing plate 82 is provided inside the end of the chord 8. One end of the high-strength bolt 9 is threadedly connected to the threaded hole on the underspin ball 7, and the other end of the high-strength bolt 9 is threadedly connected to the sealing plate 82. A hexagonal sleeve 81 is fitted around the outside of the high-strength bolt 9.

[0076] Furthermore, in the above technical solution, the specific steps for adjusting and fixing the bolts and nuts on the downspin ball nodes located at the four corner points of the first frame are as follows: by using the threaded engagement of the high-strength bolt 9 with the threaded hole on the downspin ball 7, and the threaded engagement of the high-strength bolt 9 with the sealing plate 82, the relative distance between the downspin ball 7 and the chord 8 is adjusted so that the downspin ball 7 is in a suitable position, thus completing the adjustment; then, a pin is driven into the hexagonal sleeve 81 so that the hexagonal sleeve 81 is nailed to the high-strength bolt 9; then, the end of the hexagonal sleeve 81 near the downspin ball 7 is welded to the downspin ball 7, and the end of the hexagonal sleeve 81 near the chord 8 is welded to complete the fixing.

[0077] like Figure 8 The image shown is a reference diagram of the actual process of hoisting the space frame; as shown... Figure 9 The image shown is a reference image of the completed space frame assembly; all of these reference images were installed using the methods described above.

[0078] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A high-precision positioning and installation method for a large-span space frame structure, characterized in that, Includes the following steps: S1. Verify the design dimensions of the first section of the space frame with the actual dimensions; S2. Conduct preliminary hoisting of the first section of the space frame and analyze the hoisting situation; S3. Perform high-precision adjustment on the first section of the space frame; S4. Secure the first section of the space frame; S5. The subsequent space frame is spliced ​​and installed sequentially; The specific steps for verifying the design dimensions and actual dimensions of the first section of the space frame are as follows: Select the corner points located at the four corners of the first section of the space frame, find the specific positions of the four corner points on the design drawings and their specific positions in the actual first section of the space frame, calculate the positions and dimensions of the four corner points in the design drawings, measure the positions and dimensions of the four corner points in the actual first section of the space frame, and adjust and fix the bolts and nuts on the down-spinning ball joints at the four corner points on the first section of the frame so that the positions and dimensions of the four corner points in the actual first section of the space frame are the same as the positions and dimensions of the four corner points in the design drawings; The specific operational steps for the preliminary hoisting and hoisting analysis of the first section of the space frame are as follows: The first section of the space frame is hoisted and placed on the limiting slipper at the installation position on the roof. The actual coordinate values ​​of the four corner points of the first section of the space frame are collected using a total station. Based on the actual coordinate values, a measured drawing is drawn on the design drawings. The fit between the measured drawing and the design drawing is compared. The measured drawing is then adjusted by translation, rotation, etc., on the design drawings to maximize the overlap between the two elliptical arcs of the measured drawing and the inner and outer edges of the design drawing. The fitted coordinate values ​​of the measured drawing under the condition of maximum overlap are then obtained.

2. The high-precision positioning and installation method for a large-span space frame structure according to claim 1, characterized in that, The specific operational steps for performing high-precision adjustment on the first section of the space frame are as follows: The actual coordinates of the four corner points of the first section of the space frame are collected in real time using a total station. The first section of the space frame is slowly adjusted along the axis using limit slippers. The space frame is then finely adjusted vertically using jacks. The goal is to make the actual coordinate values ​​tend towards the fitted coordinate values ​​and ensure that the error between them is ultimately within the design error range.

3. The high-precision positioning and installation method for a large-span space frame structure according to claim 2, characterized in that, The specific steps for fixing and installing the first section of the space frame are as follows: Lift the jack, remove the limiting slipper, place a temporary support structure between the bottom of the first section of the space frame and the top of the installation position, and adjust the top height of the temporary support structure so that the height of the top of the temporary support structure corresponds to the height of the pre-contact point of the first section of the space frame above it in the design drawings. Lower the jacks to place the first section of the space frame onto the temporary support structure. Check whether the actual coordinate values ​​of the four corner points of the first section of the space frame are the same as the fitted coordinate values. If they are the same, install fixed hinge supports at the bottom of the first section of the space frame to fix it. After fixing, remove the temporary support structure and the jacks. If not, raise the jacks, adjust the top height of the temporary support structure again, and then lower the jacks to place the first section of the space frame onto the temporary support structure. Check again.

4. The high-precision positioning and installation method for a large-span space frame structure according to claim 3, characterized in that, The specific steps for sequentially splicing and installing subsequent space frames are as follows: all subsequent space frame structures are installed using the same method as the first section of the space frame.

5. The high-precision positioning and installation method for a large-span space frame structure according to claim 4, characterized in that, The specific structure of the limiting slipper includes: an I-beam (1), a sliding structure (2), a beam-holding structure (3), and a beam-holding top plate (4); the beam-holding structure (3) is slidably connected to the upper part of the I-beam (1), the sliding structure (2) is disposed between the top of the I-beam (1) and the inner top wall of the beam-holding structure (3), and the beam-holding top plate (4) is fixedly disposed on the top of the beam-holding structure (3).

6. The high-precision positioning and installation method for a large-span space frame structure according to claim 5, characterized in that, The specific structure of the temporary support structure includes: a support base (5) and a pad (6). The pad (6) is placed on the upper part of the support base (5). The top of the support base (5) is provided with a rectangular recess. The bottom of the pad (6) is provided with a rectangular protrusion that matches the rectangular recess on the top of the support base (5). The top of the pad (6) is also provided with a rectangular recess that is the same as the rectangular recess on the top of the support base (5). The support base (5) and multiple pads (6) are stacked by the rectangular recess and the rectangular protrusion fitting together. The support base (5) and the gasket (6) are provided with through holes at corresponding positions on the side. A pin (51) is inserted into the through hole on the side of the support base (5). The pin (51) is used to pass through the through hole on the side of the gasket (6) to connect multiple gaskets (6). A connecting nail (52) is fixedly installed on the side wall of the support base (5), and the connecting nail (52) is connected to the pin (51) through a connecting rope (53).

7. The high-precision positioning and installation method for a large-span space frame structure according to claim 6, characterized in that, The specific structure of the underspin ball node includes: underspin ball (7), chord (8), and high-strength bolt (9). The end of the chord (8) is provided with a sealing plate (82). One end of the high-strength bolt (9) is threadedly connected to the threaded hole on the underspin ball (7), and the other end of the high-strength bolt (9) is threadedly connected to the sealing plate (82). A hexagonal sleeve (81) is fitted on the outside of the high-strength bolt (9).

8. The high-precision positioning and installation method for a large-span space frame structure according to claim 7, characterized in that, The specific steps for adjusting and fixing the bolts and nuts on the downspin ball nodes at the four corner points of the first frame are as follows: By using the threaded engagement between the high-strength bolt (9) and the threaded hole on the downspin ball (7), and the threaded engagement between the high-strength bolt (9) and the sealing plate (82), the relative distance between the downspin ball (7) and the chord (8) is adjusted so that the downspin ball (7) is in a suitable position, and the adjustment is completed; then, a pin is driven into the hexagonal sleeve (81) so that the hexagonal sleeve (81) is nailed to the high-strength bolt (9); then, the end of the hexagonal sleeve (81) near the downspin ball (7) is welded to the downspin ball (7), and the end of the hexagonal sleeve (81) near the chord (8) is welded to complete the fixing.

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