Positioning method of single-bay truss joint and single-bay truss

Abstract

The application discloses a positioning method of a single-bay truss node and a single-bay truss, and the method comprises the following steps: firstly, placing a cylindrical node on a jig and adjusting the perpendicularity and the levelness between the cylindrical node and the jig; secondly, placing a four-way node on the jig for adjustment, so that the center of the four-way node is on the same horizontal plane as the center of the cylindrical node; thirdly, determining the center of the cylindrical node as a first reference point and the center of the four-way node as a second reference point; fourthly, establishing a space coordinate system according to the first reference point and the second reference point; and finally, rotating the cylindrical node and the four-way node, and when the cylindrical node and the four-way node are rotated to target positions, installing a connecting node between the cylindrical node and the four-way node according to the space coordinate system, so that the positioning of the single-bay truss is completed. The application not only saves a large amount of time and physical strength, but also is simpler to operate, has lower requirements on the skills of operators, and has higher positioning accuracy and production efficiency.

Description

Technical Field

[0001] This invention relates to the field of building engineering technology, specifically to a method for locating nodes of a single truss and a single truss. Background Technology

[0002] In the construction of large stadium roofs and steel structure factory buildings, triangular single-truss structures are commonly used. Taking a large stadium project as an example, its east and west roofs contain 22 triangular single-truss structures. Each single-truss consists of 3 nodes (including a cylindrical node, a four-way node, and another node), 6 pipes, and 3 flanges. The cylindrical node is a complex node, consisting of a cylindrical body and two directional circular pipes fixedly connected to the cylindrical body. The plane formed by the intersection of the two circular pipes is the truss surface. The four-way node consists of three circular pipes.

[0003] In existing technologies, the common method for positioning triangular single trusses is to use pre-embedded ground samples as reference points. The specific process is as follows: confirm the ground sample reference point, use a total station to establish a measurement coordinate system through the ground sample, and then locate the cylindrical nodes, four-way nodes, and other nodes in sequence. However, during the operation, the operator needs to first adjust the verticality of the cylindrical nodes and the horizontality of the circular pipes, and then use tools such as crowbars and hoists to move the nodes so that the center of the cylinder is aligned with the ground sample coordinates. However, moving the nodes will disrupt the already adjusted verticality and horizontality, forcing the operator to readjust the verticality and horizontality. But when adjusting the verticality and horizontality, the center position of the node will deviate again, resulting in repeated cycles. Moreover, due to the large weight of the nodes themselves, each movement is extremely laborious, so re-measurement is required after each adjustment, resulting in excessively long positioning time for the cylindrical nodes. At the same time, the ground sample method requires the pre-embedding of ground sample points and the use of a total station for axis establishment, which is complex, requires high operator skills, relies on experience and judgment, and the error of the ground sample will affect the final positioning accuracy. Summary of the Invention

[0004] Firstly, the main objective of this invention is to provide a method for locating a single truss node, comprising: The cylindrical node is placed on the jig, and the verticality and horizontality between the cylindrical node and the jig are adjusted; the cylindrical node includes a cylindrical body and a first circular tube and a second circular tube fixedly connected to the cylindrical body; The four-way connector is placed on the frame and adjusted so that the center of the four-way connector and the center of the cylindrical connector are on the same horizontal plane, and the cylindrical body is perpendicular to the horizontal plane along the axial direction. The first and second cylindrical tubes are on the horizontal plane. Preferably, the cylindrical node includes a cylindrical body and a first circular tube and a second circular tube fixedly connected to the cylindrical body; the step of placing the cylindrical node on the jig and adjusting the perpendicularity and horizontality between the cylindrical node and the jig includes: The cylindrical node is hoisted onto the jig and placed in a preset support position. The verticality of the cylindrical body is measured and adjusted. When the verticality of the cylindrical body is within 0.1°, the verticality adjustment of the cylindrical node is considered complete. The levelness of the first and second circular tubes is measured and adjusted. When the levelness of the first and second circular tubes is within 0.5°, the levelness adjustment of the cylindrical node is considered complete.

[0005] Preferably, the verticality and horizontality of the cylindrical node are adjusted by adding or removing shims at the bottom of the cylindrical body.

[0006] Preferably, placing the four-way connector on the jig and adjusting the four-way connector to be on the same horizontal plane as the cylindrical connector includes: The four-way node is hoisted onto the jig, and the verticality of the four-way node is measured and adjusted. When the horizontality of the four-way node is adjusted to within 0.1° and the height difference between the four-way node and the cylindrical node is less than 2mm, it is determined that the four-way node and the cylindrical node are on the same horizontal plane.

[0007] Preferably, determining the center of the cylindrical node as the first reference point and the center of the four-way node as the second reference point, and establishing a spatial coordinate system based on the first reference point and the second reference point includes: The intersection of the cylindrical body, the first circular tube, and the second circular tube is taken as the first reference point, and the intersection of the four-way node is taken as the second reference point. Measure the spatial coordinates of the first reference point and the second reference point, and establish the X-axis using the line connecting the first reference point and the second reference point; The Z-axis is determined based on the axial direction of the main cylindrical body, and the Y-axis is determined according to the right-hand rule, thus obtaining the spatial coordinate system.

[0008] Preferably, rotating the cylindrical node and the four-way node to the target position includes: Using the intersection of the cylindrical nodes as the rotation center, while keeping the perpendicularity of the main body of the cylinder unchanged, the angles of the first and second cylindrical tubes are adjusted. When the deviation of the coordinates of the end point of the first cylindrical tube from the preset value is less than 2mm, the cylindrical node is determined to be in the target position. The four-way node is rotated around the intersection point of the four-way nodes as the rotation center. When the four-way node is aligned with the first round pipe and the second round pipe, the four-way node is determined to be in the target position.

[0009] Preferably, the step of installing the connecting node between the cylindrical node and the four-way node according to the spatial coordinate system to obtain the positioned single truss includes: The connection node is located according to the spatial coordinate system; Connecting pipes are used to connect the connecting nodes to the cylindrical nodes and the four-way nodes to obtain a single truss with complete positioning.

[0010] Preferably, the included angles between the first and second circular tubes and the cylindrical body are both 90 degrees.

[0011] Preferably, the four-way node includes a main circular pipe and two branch circular pipes, the two branch circular pipes are connected to the main circular pipe, and the main circular pipe and the two branch circular pipes have the same intersection point.

[0012] Secondly, the main objective of this invention is to provide a single truss assembled using the positioning method described above.

[0013] The above-described solution of the present invention has at least the following beneficial effects: The positioning method for a single truss node provided by this invention first places the cylindrical node on a jig and adjusts the verticality and horizontality between the cylindrical node and the jig. Then, the four-way node is placed on the jig and adjusted so that the center of the four-way node and the center of the cylindrical node are on the same horizontal plane. Next, the center of the cylindrical node is determined as the first reference point, and the center of the four-way node is determined as the second reference point. A spatial coordinate system is established based on the first reference point and the second reference point. Finally, the cylindrical node and the four-way node are rotated. When the cylindrical node and the four-way node are rotated to the target position, the connecting node is installed between the cylindrical node and the four-way node according to the spatial coordinate system, thus obtaining a single truss with complete positioning. This avoids repeated cycles and establishes a coordinate system based on the node itself, completely eliminating the operation of moving the node with crowbars and hoists to align with the ground in traditional methods. This not only saves a lot of time and energy, but also makes the operation simpler, requires less skill from the operator, and has higher positioning accuracy and production efficiency. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art 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 the structures shown in these drawings without creative effort.

[0015] Figure 1 This is a flowchart illustrating the positioning method for a single truss node provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of a single truss provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the cylindrical node provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the four-way node provided in the embodiment of the present invention; The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0016] 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 a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0017] The terms "first," "second," and "third," etc., used in the specification, claims, and accompanying drawings of this invention are used to distinguish different objects and not to describe a specific order. Furthermore, the term "comprising," and any variations thereof, is intended to cover a non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0018] First, let's take a look at the relevant accompanying drawings to illustrate the solution of the embodiments of this application.

[0019] like Figure 1 As shown, a specific embodiment of the present invention provides a method for locating a single truss node, including: S10. Place the cylindrical node 10 on the jig and adjust the perpendicularity and horizontality between the cylindrical node 10 and the jig.

[0020] In this embodiment, the cylindrical node 10 includes a cylindrical body 11 and a first circular tube 12 and a second circular tube 13 fixedly connected to the cylindrical body 11. The included angles between the first circular tube 12 and the second circular tube 13 and the cylindrical body 11 are both 90 degrees. The above-mentioned placement of the cylindrical node 10 on the jig and adjustment of the verticality and horizontality between the cylindrical node 10 and the jig include: hoisting the cylindrical node 10 onto the jig and placing it at a preset support position. The jig is mainly used for load-bearing process equipment. The preset support position can be the top of the jig. The verticality of the cylindrical body 11 is measured using a spirit level and then... Adjustments can be made to the cylindrical body 11 when tilting occurs. During adjustment, shims can be added or removed from the bottom of the cylindrical body 11, and the verticality can be measured after each addition or removal of shims. If the verticality of the cylindrical body 11 is within 0.1°, the verticality adjustment of the cylindrical node 10 can be determined. The horizontality of the first circular tube 12 and the second circular tube 13 can be measured using a spirit level. Similarly, shims can be added or removed from the bottom of the cylindrical body 11 and adjusted. If the horizontality of the first circular tube 12 and the second circular tube 13 is within 0.5°, the horizontality adjustment of the cylindrical node 10 can be determined.

[0021] S20. Place the four-way node 20 on the jig and adjust the four-way node 20 to be on the same horizontal plane as the cylindrical node 10.

[0022] Specifically, the four-way node 20 includes a main circular pipe 21 and two branch circular pipes 22. The two branch circular pipes 22 are connected to the main circular pipe 21, and the main circular pipe 21 and the two branch circular pipes 22 have the same intersection point. The above-mentioned placement of the four-way node 20 on the jig and adjustment of the four-way node 20 to be on the same horizontal plane as the cylindrical node 10 includes: hoisting the four-way node 20 onto the jig, measuring and adjusting the verticality of the four-way node 20. When the horizontality of the four-way node 20 is adjusted to within 0.1° and the height difference between the four-way node 20 and the cylindrical node 10 is less than 2mm, it is determined that the four-way node 20 and the cylindrical node 10 are on the same horizontal plane.

[0023] S30. Determine the center of the cylindrical node 10 as the first reference point and the center of the four-way node 20 as the second reference point. Establish a spatial coordinate system based on the first and second reference points.

[0024] Specifically, the above-mentioned determination of the center of the cylindrical node 10 as the first reference point and the center of the four-way node 20 as the second reference point, and the establishment of a spatial coordinate system based on the first reference point and the second reference point, includes: taking the intersection of the cylindrical body 11, the first circular tube 12 and the second circular tube 13 as the first reference point, and taking the intersection of the four-way node 20 as the second reference point; measuring the spatial coordinates of the first reference point and the second reference point, establishing the X-axis with the line connecting the first reference point and the second reference point, determining the Z-axis according to the axial direction of the cylindrical body 11, and determining the Y-axis according to the right-hand rule, thus obtaining the spatial coordinate system.

[0025] S40. Rotate the cylindrical node 10 and the four-way node 20. When the cylindrical node 10 and the four-way node 20 are rotated to the target position, install the connecting node 30 between the cylindrical node 10 and the four-way node 20 according to the spatial coordinate system to obtain the single truss with the positioning completed.

[0026] Specifically, the above-mentioned rotation of the cylindrical node 10 and the four-way node 20 to the target position includes: using the intersection of the cylindrical nodes 10 as the rotation center, maintaining the perpendicularity of the cylindrical body 11, adjusting the angles of the first circular tube 12 and the second circular tube 13, and determining that the cylindrical node 10 is in the target position when the deviation of the coordinates of the endpoint of the first circular tube 12 from the preset value is less than 2mm; using the intersection of the four-way node 20 as the rotation center to adjust the angles of the four-way node 10 and the four-way node 20 to the target position. Rotate point 20, and when the four-way node 20 is aligned with the first circular pipe 12 and the second circular pipe 13, determine that the four-way node 20 is in the target position. Furthermore, the above-mentioned installation of the connecting node 30 between the cylindrical node 10 and the four-way node 20 according to the spatial coordinate system to obtain the single truss with the positioning completed includes: positioning the connecting node 30 according to the spatial coordinate system; and using the connecting pipe 40 to connect the connecting node 30 with the cylindrical node 10 and the four-way node 20 to obtain the single truss with the positioning completed.

[0027] As an alternative embodiment, the following is an example of the construction of a triangular single truss for a stadium roof.

[0028] The system provides cylindrical node 10, four-way node 20, connecting node 30, and connecting pipe 40. Cylindrical node 10 includes a cylindrical body 11 (diameter 200mm, length 300mm) and a first circular pipe 12 (diameter 100mm) and a second circular pipe 13 (diameter 100mm) welded to the cylindrical body 11. The two circular pipes are perpendicular to each other, and the plane formed by their intersection is the truss surface. The 90° perpendicularity between the cylindrical body 11 and the circular pipes is guaranteed during the manufacturing stage (within ±0.2° tolerance). The four-way node 20 is formed by welding three circular pipes, with its center being the intersection of the centerlines of the three circular pipes. Rapid positioning is achieved using the above method, with the specific steps as follows: I. Adjustment of the perpendicularity of cylinder node 10 The cylindrical node 10 is hoisted onto the jig and placed in the preset support position. The operator uses a spirit level to measure the verticality of the cylindrical body 11 and finds a tilt of about 0.6°. A 3mm thick shim is added below the lower side of the cylindrical body 11, and the verticality deviation is measured again. The deviation is reduced to within 0.1°. Based on the above steps, the corresponding time can be determined to be about 15 minutes.

[0029] By measuring the levelness of the first circular tube 12 and the second circular tube 13 using a spirit level, the levelness deviation of the first circular tube 12 is 0.2° and that of the second circular tube 13 is 0.15°, both within the design tolerance (0.5°) and no adjustment is required; the corresponding time can be determined to be approximately 5 minutes.

[0030] II. Horizontal adjustment of Sitong Node 20 Hoist the four-way node 20 onto the jig and use a spirit level to measure its levelness. There is a 0.5° tilt. Add or remove shims under the four-way node 20 to adjust the levelness to within 0.1°. At the same time, ensure that the four-way node 20 and the cylindrical node 10 are roughly on the same horizontal plane (height difference not exceeding 2mm). The corresponding time can be determined to be about 20 minutes.

[0031] III. Establishing a Spatial Coordinate System Using the center of cylindrical node 10 as the first reference point and the center of four-way node 20 as the second reference point, the spatial coordinates of the two reference points are measured using a total station. The line connecting the two reference points is taken as the X-axis, and the direction perpendicular to the truss surface (i.e., the direction of the axis of the main body of the cylinder 11) is taken as the Z-axis. The Y-axis is determined according to the right-hand rule to establish a spatial coordinate system. This stage takes about 10 minutes. The center of cylindrical node 10 does not need to be aligned with any external ground sampling points.

[0032] IV. Angle Adjustment According to the design drawings, the first circular pipe 12 and the second circular pipe 13 need to be rotated to a specific angle (e.g., aligned with the four-way node 20). The operator uses a jack and crowbar to slowly rotate the cylindrical node 10, using its center as the rotation center, while simultaneously using a total station to measure the spatial coordinates of the endpoint of the first circular pipe 12, providing real-time feedback on the rotation angle. Rotation stops when the coordinates of the endpoint of the first circular pipe 12 deviate from the design value by less than 2mm. After rotation, the verticality of the cylindrical body 11 is re-measured; the deviation remains at 0.1°, indicating no change, verifying that the rotation operation does not affect the already adjusted verticality. This stage takes approximately 15 minutes.

[0033] Similarly, using the center of the four-way node 20 as the rotation center, rotate and adjust the angle of the four-way node 20 to the target position, which takes about 15 minutes.

[0034] V. Remaining node positioning and installation of connecting pipe 40 Using the established spatial coordinate system as a reference, the third node of the triangular single frame is located using a total station, and the connecting pipes 40 between each node are installed; this stage takes about 2 hours.

[0035] Based on the above embodiments, the positioning method in the embodiments of the present invention is compared with the traditional ground sampling method, and the comparison results are shown in the table below: Comparison items Traditional land sampling method Method of the present invention Positioning time of cylindrical node 10 4 hours 0.5 hours Sitong Node 20 Positioning Time 2 hours 0.5 hours Time to establish coordinate system 0.5 hours (ground sample installation + total station axis establishment) 0.5 hours (total station measurement of two points) Angle adjustment time 2 hours (including cyclical adjustments) 0.5 hours Remaining nodes and connecting pipes 40 installation 3.5 hours 2 hours Total positioning time 12 hours 4 hours shortening ratio — 66% Number of adjustments (cylinder node 10) 5-6 cycles Linear Do we need to move the node to align with the ground sample? It is (the most strenuous operation). no Adjust path type Loop (cannot converge) Linear (completed in one step) Final verticality error ±0.3° ±0.1° Final levelness error ±0.4° ±0.15° As shown in the table above, in the traditional land sampling method, the process involves adjusting verticality → moving nodes to align with the land sample → verticality being disrupted → readjusting verticality, creating a non-convergent loop. In this invention, once the verticality is adjusted, the nodes do not need to move; they simply rotate around their own center, preserving the verticality and forming a linear adjustment path completed in one step. The essential difference between "loop" and "linear" is that each step in a loop path disrupts the results of the previous step, making convergence impossible by increasing the number of iterations; while each step in a linear path accumulates from the previous step, ultimately achieving the goal in one go.

[0036] Furthermore, this invention selects the intersection of the cylindrical body 11, the first circular tube 12, and the second circular tube 13 as the rotation center, rather than the bottom or edge of the node. Since this intersection is located at the geometric center of the node, each component rotates around its own center during rotation without generating additional displacement, thus ensuring that the adjusted verticality and horizontality are not destroyed. Experimental verification shows that after rotating 10°, 20°, and 30°, the change in verticality is ≤0.05°, proving that the rotation operation does not destroy the adjusted verticality and horizontality.

[0037] Using the method provided in this embodiment of the invention, both the final verticality error and the final horizontality error are reduced, and the overall positioning time is significantly shortened, saving a lot of time and effort. Furthermore, by selecting 20 qualified cylindrical nodes 10, first adjusting the verticality to within 0.1°, and then measuring the horizontality of the cylindrical tube, the results show that the horizontality of 18 nodes (90%) directly meets the design requirements (≤0.5°), and the horizontality deviation of 2 nodes (10%) is between 0.5° and 0.8°, requiring only minor correction (1-2 minutes). After the verticality is adjusted to the correct position, the nodes are rotated by 10°, 20°, and 30° respectively, with the verticality change measured to be ≤0.05°, verifying that the rotation operation does not destroy the adjusted verticality and horizontality. Using the method of this invention, the node center does not need to be moved to align with the external point, thereby eliminating the most laborious operation in the traditional method and avoiding the destruction of verticality and horizontality caused by this operation.

[0038] The positioning method for a single truss node provided by this invention first places the cylindrical node 10 on a jig and adjusts the verticality and horizontality between the cylindrical node 10 and the jig. Then, the four-way node 20 is placed on the jig and adjusted so that the center of the four-way node 20 and the center of the cylindrical node 10 are on the same horizontal plane. Next, the center of the cylindrical node 10 is determined as the first reference point, and the center of the four-way node 20 is determined as the second reference point. A spatial coordinate system is established based on the first and second reference points. Finally, the cylindrical node 10 and the four-way node 20 are positioned... Node 20 is rotated. When the cylindrical node 10 and the four-way node 20 are rotated to the target position, the connecting node 30 is installed between the cylindrical node 10 and the four-way node 20 according to the spatial coordinate system, thus obtaining a single truss with complete positioning. This avoids repeated cycles. Furthermore, the coordinate system is established with the node itself as the reference, completely eliminating the operation of moving the node with crowbars and hoists to align with the ground in the traditional method. This not only saves a lot of time and energy, but also makes the operation simpler, requires less skill from the operators, and has higher positioning accuracy and production efficiency.

[0039] Reference Figures 2 to 3 As shown, an embodiment of the present invention provides a single truss, which is assembled using the positioning method described above. The single truss can be a triangular truss, including a cylindrical node 10, a four-way node 20, a connecting node 30, and a connecting pipe 40. The cylindrical node 10 includes a cylindrical body 11 and a first circular pipe 12 and a second circular pipe 13 fixedly connected to the cylindrical body 11. The four-way node 20 includes a main circular pipe 21 and two branch circular pipes 22. The two branch circular pipes 22 are connected to the main circular pipe 21, and the main circular pipe 21 and the two branch circular pipes 22 have the same intersection point.

[0040] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0041] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made under the concept of the present invention using the contents of the present invention specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A method for locating a node of a single truss, characterized in that, include: The cylindrical node is placed on the jig, and the verticality and horizontality between the cylindrical node and the jig are adjusted; the cylindrical node includes a cylindrical body and a first circular tube and a second circular tube fixedly connected to the cylindrical body; The four-way connector is placed on the frame and adjusted so that the center of the four-way connector and the center of the cylindrical connector are on the same horizontal plane, and the cylindrical body is perpendicular to the horizontal plane along the axial direction. The first and second cylindrical tubes are on the horizontal plane. The center of the cylindrical node is determined as the first reference point, and the center of the four-way node is determined as the second reference point. A spatial coordinate system is established based on the first reference point and the second reference point. The cylindrical node and the four-way node are rotated. When the cylindrical node and the four-way node are rotated to the target position, the connecting node is installed between the cylindrical node and the four-way node according to the spatial coordinate system, so as to obtain a single truss with complete positioning.

2. The method for positioning a single truss node according to claim 1, characterized in that, The step of placing the cylindrical node on the jig and adjusting the perpendicularity and horizontality between the cylindrical node and the jig includes: The cylindrical node is hoisted onto the jig and placed in a preset support position. The verticality of the cylindrical body is measured and adjusted. When the verticality of the cylindrical body is within 0.1°, the verticality adjustment of the cylindrical node is considered complete. The levelness of the first and second circular tubes is measured and adjusted. When the levelness of the first and second circular tubes is within 0.5°, the levelness adjustment of the cylindrical node is considered complete.

3. The method for positioning a single truss node according to claim 1, characterized in that, The verticality and horizontality of the cylindrical nodes are used to adjust the bottom of the cylindrical body by adding or removing shims.

4. The method for positioning a single truss node according to claim 1, characterized in that, The step of placing the four-way connector on the jig and adjusting the four-way connector to be on the same horizontal plane as the cylindrical connector includes: The four-way node is hoisted onto the jig, and the verticality of the four-way node is measured and adjusted. When the horizontality of the four-way node is adjusted to within 0.1° and the height difference between the four-way node and the cylindrical node is less than 2mm, it is determined that the four-way node and the cylindrical node are on the same horizontal plane.

5. The method for positioning a single truss node according to claim 1, characterized in that, The step of determining the center of the cylindrical node as the first reference point and the center of the four-way node as the second reference point, and establishing a spatial coordinate system based on the first reference point and the second reference point includes: The intersection of the cylindrical body, the first circular tube, and the second circular tube is taken as the first reference point, and the intersection of the four-way node is taken as the second reference point. Measure the spatial coordinates of the first reference point and the second reference point, and establish the X-axis using the line connecting the first reference point and the second reference point; The Z-axis is determined based on the axial direction of the main cylindrical body, and the Y-axis is determined according to the right-hand rule, thus obtaining the spatial coordinate system.

6. The method for positioning a single truss node according to claim 1, characterized in that, The step of rotating the cylindrical node and the four-way node to the target position includes: Using the intersection of the cylindrical nodes as the rotation center, while keeping the perpendicularity of the main body of the cylinder unchanged, the angles of the first and second cylindrical tubes are adjusted. When the deviation of the coordinates of the end point of the first cylindrical tube from the preset value is less than 2mm, the cylindrical node is determined to be in the target position. The four-way node is rotated around the intersection point of the four-way nodes as the rotation center. When the four-way node is aligned with the first round pipe and the second round pipe, the four-way node is determined to be in the target position.

7. The method for positioning a single truss node according to claim 1, characterized in that, The step of installing the connecting node between the cylindrical node and the four-way node according to the spatial coordinate system to obtain the positioned single truss includes: The connection node is located according to the spatial coordinate system; Connecting pipes are used to connect the connecting nodes to the cylindrical nodes and the four-way nodes to obtain a single truss with complete positioning.

8. The method for positioning a single truss node according to claim 1, characterized in that, The angle between the first and second circular tubes and the main cylindrical body is 90 degrees.

9. The method for positioning a single truss node according to claim 1, characterized in that, The four-way node includes a main circular pipe and two branch circular pipes. The two branch circular pipes are connected to the main circular pipe, and the main circular pipe and the two branch circular pipes have the same intersection point.

10. A single truss, characterized in that, It is assembled using the positioning method described in any one of claims 1 to 9.

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