A venue steel truss modular rapid and accurate installation method

Abstract

The present application belongs to the field of steel truss modular installation, and particularly relates to a venue steel truss modular rapid and accurate installation method. The present application can solve the correction operation amount of the modular steel truss group in the air operation through the pre-assembly of the to-be-installed layer modular steel truss on the ground, effectively overcome the error problem of the air group, improve the accuracy of the air group operation by reducing or even eliminating the group gap deviation in advance during the pre-assembly. During the pre-assembly, the upper and lower layers are also pre-assembled, which can overcome the installation error of the upper and lower layers during the high-altitude operation, and further reduce the air group operation amount and greatly reduce the operation risk.

Description

Technical Field

[0001] This invention belongs to the field of modular installation of steel trusses, specifically a method for rapid and precise modular installation of stadium steel trusses. Background Technology

[0002] Existing stadium-type space frames generally employ a high-altitude, piecemeal assembly method. This involves workers using cranes to lift steel components and then welding them layer by layer. However, the steel components have inherent manufacturing errors during factory prefabrication, especially at the joints. Furthermore, the welding process typically involves spot welding followed by full welding. Once spot welding is completed, the angle and position of the components cannot be adjusted, leading to significant installation errors. Because of the layer-by-layer approach, the installation error at the top gradually increases, resulting in a large deviation between the overall structural stress and design requirements, failing to meet construction standards. Additionally, the high-altitude, piecemeal assembly method requires the use of a mobile crane to adjust the height and angle of the steel components before joining them, necessitating multiple complex operations to complete the connection, significantly increasing the safety risks associated with working at height. Summary of the Invention

[0003] The technical problem to be solved by this invention is:

[0004] How to solve the problem that existing venue-type space frame construction cannot effectively and quickly achieve precise installation.

[0005] To solve the above-mentioned technical problems, the inventors, through practice and summarization, derived the technical solution of this invention, which adopts the following technical solution:

[0006] A method for rapid and precise modular installation of stadium steel trusses, comprising the following steps:

[0007] Step 1: Modular Steel Truss Assembly

[0008] After leveling the ground, the positioning lines of the jig are marked. The steel truss jig is assembled using a 25t truck crane. The main chord members of the truss are assembled and temporarily fixed. The secondary chord members are installed and temporarily fixed. The diagonal web members are installed to complete the modular assembly of the steel truss.

[0009] Step 2: Marking the lines

[0010] A total station was used to reposition and mark the four corners of the modular steel truss to be installed on each floor on the ground.

[0011] Step 3: Modular pre-assembly of the lower steel truss

[0012] Install leveling supports at the corresponding marked positions, and pre-assemble the modular steel truss on all leveling supports;

[0013] Based on the gaps between the modular steel trusses, steel plates of appropriate size are selected for welding compensation or cutting to meet the design requirements, thus obtaining the lower pre-assembled modules;

[0014] The top of the modular steel truss of the lower layer to be installed is trimmed and uniform, and distributed parallel to the corresponding adjustment supports;

[0015] On the lower modular steel truss to be installed, the upper modular steel truss is pre-assembled using a 25t truck crane.

[0016] Based on the gaps between the modular steel trusses to be installed on the upper layer, steel plates of appropriate size are selected for welding compensation or cutting to meet the design requirements, and the upper pre-assembled modules are obtained on the lower layer to be installed.

[0017] Label the lower-level pre-assembled module and each module in the lower-level pre-assembled module;

[0018] Make butt marking lines at the joints of the upper and lower pre-assembled modules;

[0019] Separate the modules of the upper pre-assembled module according to the original modular joints;

[0020] Separate the modules of the upper pre-assembled module according to the original modular joints;

[0021] Step 4: Lifting Operation

[0022] The pre-assembled and disassembled modular steel trusses were lifted and positioned according to their markings using a 500t truck crane, thus completing the assembly and fixing of the steel trusses for the lower layer to be installed.

[0023] After adjusting the leveling supports to their corresponding positions, proceed with the next layer of pre-assembly.

[0024] Repeat steps three and four until the steel truss of the venue is assembled. Assemble the steel truss at the joints of the upper and lower modular steel trusses according to the docking marking lines.

[0025] Further solutions:

[0026] In step two, when assembling the modular structure of the upper layer to be installed on the modular steel truss of the lower layer to be installed, the upper and lower pre-assembled layers are parallel as a whole, and the centers of the lower layer to be installed and the upper layer to be installed are located in the same vertical line.

[0027] Further solutions:

[0028] In step two, before pre-assembling the first-layer steel truss, a total station is used to mark the horizontal projection position of the center of the steel truss space frame installation layer on the ground, which meets the design requirements. This position serves as the foundation point for all subsequent layers to be installed. During the pre-assembly of the first-layer steel truss, pre-set foundation seats are installed on the grandstand, and the position and angle of all foundation seats meet the design requirements.

[0029] Further solutions:

[0030] Each set of marking lines on the upper and lower modular steel trusses includes at least three lines, and after the three marking lines are fully aligned, they are directly welded together.

[0031] Further solutions:

[0032] At least two sets of laser emitters are installed on each modular steel truss. The laser emitters are mounted on the corresponding modular steel truss and emit lasers with the intersection point located directly above the center of the venue.

[0033] Further solutions:

[0034] The pre-assembled modules of each installation layer are divided into at least three groups, and there is at least one identical modular steel truss at both ends of each adjacent group of pre-assembled modules;

[0035] The modular steel truss joints of the upper layer to be installed and the modular steel truss joints of the lower layer to be installed are staggered.

[0036] Further solutions:

[0037] The truck crane has a lifting frame installed on its hook, and two sets of clamping rods are provided at the bottom of the lifting frame;

[0038] The modular steel truss is equipped with mounting bases, which are installed on the modular steel truss via pipe clamps, and the mounting bases are provided with connecting grooves.

[0039] The clamping rod is used to clamp the connecting groove on the mounting base.

[0040] Further solutions:

[0041] The clamping rod includes a lower edge seat and a hook rod. The lower edge seat is installed on the bottom of the hanger and has a downward-sloping guide hole. A guide bolt is slidably installed in the guide hole and is installed on the top outer side of the hook rod. The hook rod moves obliquely relative to the lower edge seat. An extension seat is provided at the bottom of the hook rod away from the lower edge seat. A hook block is provided at the bottom of the extension seat and moves obliquely upward relative to the extension seat to adjust the distance between the bottom and the top of the extension seat.

[0042] Further solutions:

[0043] The hook block is equipped with a rotating rod and a T-shaped slider. The rotating rod has a Z-shaped structure, and the end away from the hook block is the hook head.

[0044] The bottom of the extension seat is provided with an upwardly sloping wedge-shaped surface, and the wedge-shaped surface is provided with a circulation guide groove and a T-shaped slide groove, and the T-shaped slider and the T-shaped slide groove slide in a sliding fit.

[0045] The circulation guide channel includes an upward channel 1, a downward channel 1, an upward channel 2, and a downward channel 2. The outlet of the upward channel 1 and the inlet of the downward channel 2 intersect. The inlet of the upward channel 1 and the outlet of the downward channel 1 intersect. The outlet of the upward channel 2 and the inlet of the downward channel 2 intersect and are equal in height to the intersection point of the outlet of the upward channel 1 and the inlet of the downward channel 2. The outlet of the downward channel 1 and the inlet of the upward channel 2 intersect and the intersection point is lower than the intersection point of the outlet of the upward channel 2 and the inlet of the downward channel 2.

[0046] Further solutions:

[0047] The inlet depths of the first upward channel, the first downward channel, the second upward channel, and the second downward channel are greater than their respective outlet depths, and their respective inlet depths are all equal, and their respective outlet depths are all equal.

[0048] When the hook head is located at the intersection of the outlet of the down channel one and the inlet of the up channel two, the distance between the bottom of the hook block and the top of the extension seat meets the condition for entering the connecting groove.

[0049] When the hook head is located at the intersection of the outlet of the downward channel 2 and the inlet of the upward channel 1, the distance between the bottom of the hook block and the top of the extension seat does not meet the conditions for entering the connecting groove.

[0050] Compared with the prior art, the present invention has the following beneficial effects:

[0051] This invention significantly reduces aerial work by employing a modular installation method. Secondly, pre-assembly of the modular steel trusses to be installed on the ground eliminates the workload associated with assembling the modular steel trusses in the air (e.g., alignment, compensation, cutting, etc.), and effectively overcomes the errors that easily occur during aerial assembly. By reducing or even eliminating gap deviations during pre-assembly, the accuracy of aerial assembly is improved. During pre-assembly, upper and lower layers are pre-assembled and marked for connection. In the air, only the markings need to be aligned, making it easy to determine if the connection is accurate. Pre-assembly of upper and lower layers overcomes installation errors that easily occur during high-altitude assembly, further reducing the workload of aerial assembly and greatly mitigating operational risks.

[0052] This invention addresses the issue of installation errors between pre-assembled layers by grouping each layer for construction. This is because it is impossible to complete the work on the ground within the venue, and each group has at least one set of modular steel trusses at both ends to serve as a reference for the work. Alternatively, pre-assembly can be carried out within the venue, but this method involves a larger hoisting load, and tower cranes can be used instead of truck cranes. Attached Figure Description

[0053] Figure 1 This is a schematic diagram of the overall structure of the modular steel truss after pre-assembly in groups according to the present invention;

[0054] Figure 2 This is a schematic diagram of the overall structure of the modular steel truss after installation according to the present invention;

[0055] Figure 3 This is a schematic vertical cross-sectional view of the modular steel truss after installation according to the present invention.

[0056] Figure 4 This is a schematic diagram of the hoisting of the modular steel truss in this invention;

[0057] Figure 5 This is a diagram showing the connection relationship between the hanger and the modular steel truss in this invention;

[0058] Figure 6 for Figure 5 Connection diagram of the hook-type hanging rod and modular steel truss;

[0059] Figure 7 for Figure 6 Local magnification at point F Figure 1 ;

[0060] Figure 8 for Figure 6 Local magnification at point F Figure 2 ;

[0061] Figure 9 for Figure 6 Diagram showing the connection relationship between the center hook block and the extension seat. Detailed Implementation

[0062] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0063] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", 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.

[0064] Example 1, such as Figures 1 to 3 As shown, a method for rapid and precise modular installation of stadium steel trusses includes the following steps:

[0065] Step 1: Modular Steel Truss Assembly

[0066] After leveling the ground, the jig is positioned and marked. A 25t truck crane is used to assemble the steel truss jig. The main chord members of the truss are assembled and temporarily fixed. The secondary chord members are installed and temporarily fixed. The diagonal web members are installed to complete the modular assembly of the steel truss. This jig is a traditional jig. Only the overall jig part is used for adaptive selection in a certain area. No specific changes are made to the structure. For the convenience of technical understanding, those skilled in the art can assume that this part is within the scope of the prior art.

[0067] Step 2: Marking the lines

[0068] A total station was used to reposition and mark the four corners of the modular steel truss to be installed on each floor on the ground.

[0069] Install leveling supports at the corresponding marked positions, and pre-assemble the modular steel truss of the lower layer to be installed on all leveling supports;

[0070] The leveling support and the foundation at the design mark location are set parallel to each other, only in different positions. For the convenience of those skilled in the art, the leveling support here is equivalent to a copy and translation of the foundation at the design mark location, and the positional relationship of all the leveling supports is equivalent to the positional relationship of all the foundations at the design mark locations.

[0071] Based on the gaps between the modular steel trusses, steel plates of appropriate size are selected for welding compensation or cutting to meet the design requirements, resulting in the lower pre-assembled modules. The pre-assembly between modules can be achieved by using two pipe clamps in conjunction with a bidirectional screw in the middle to adjust the distance between the two pipe clamps. The two adjacent modules can be assembled and connected by rotating the bidirectional screw in the middle to adjust the distance between the two pipe clamps.

[0072] The top of the modular steel truss of the lower layer to be installed is trimmed and uniform, and distributed parallel to the corresponding adjustment supports;

[0073] On the lower modular steel truss to be installed, the upper modular steel truss is pre-assembled using a 25t truck crane.

[0074] Based on the gaps between the modular steel trusses to be installed on the upper layer, steel plates of appropriate size are selected for welding compensation or cutting to meet the design requirements, and the upper pre-assembled modules are obtained on the lower layer to be installed.

[0075] Label the lower-level pre-assembled module and each module in the lower-level pre-assembled module;

[0076] Make butt marking lines at the joints of the upper and lower pre-assembled modules;

[0077] Separate the modules of the upper pre-assembled module according to the original modular joints, that is, remove the pipe clamps;

[0078] Step 4: Lifting Operation

[0079] The pre-assembled and disassembled modular steel trusses were lifted and positioned according to their markings using a 500t truck crane, thus completing the assembly and fixing of the steel trusses for the lower layer to be installed.

[0080] After adjusting the leveling support to the marked position of the corresponding layer, proceed with the pre-assembly work for the next layer;

[0081] Repeat steps three and four until the steel truss of the venue is assembled. Assemble the steel truss at the joints of the upper and lower modular steel trusses according to the docking marking lines.

[0082] In Example 2, based on Example 1, when assembling the modular structure of the upper layer to be installed on the modular steel truss of the lower layer to be installed in step two, the upper and lower pre-assembled layers are parallel as a whole, and the centers of the lower and upper layers to be installed are located in the same vertical line. When assembling the modular steel truss of the upper layer to be installed, the same two pipe clamps can be used in conjunction with the intermediate bidirectional screw to adjust the distance between the two pipe clamps to ensure the parallelism of the two installation layers.

[0083] Example 3, based on Example 1, in step 2, before pre-assembling the first-layer steel truss, a total station is used to mark the horizontal projection position of the center of the steel truss space frame installation layer that meets the design requirements on the ground. This position serves as the foundation point for all subsequent layers to be installed. During the pre-assembly of the first-layer steel truss, pre-set foundation seats are installed on the grandstand, and the position and angle of all foundation seats meet the design requirements.

[0084] Example 4, based on one example, includes at least three marking lines in each group on the upper and lower modular steel trusses. These three lines are circumferentially distributed around the periphery of the steel pipe. After the three marking lines are perfectly aligned, they are directly and fully welded, saving the spot welding step. Since pre-assembly is completed on the ground, installation errors are eliminated. Furthermore, spot welding is prone to problems such as incomplete welds and weak weld points. These areas may become weak points during subsequent full welding, affecting the strength and stability of the overall welded structure. The metal structure around the weld point after spot welding changes due to heat, resulting in poor fusion and fluidity of the weld during full welding, thus affecting the uniformity and density of the weld. Secondly, the welded part has already undergone some deformation after spot welding. If this deformation is not corrected or compensated before full welding, it will be exacerbated during the full welding process, even leading to warping, twisting, and other problems. Therefore, this application adopts a direct full welding method. Figure 4 As shown, to ensure that the steel truss remains stable during full welding, four steel wire ropes are laid on the modular steel truss before each modular steel truss is installed. The four steel wire ropes are distributed in a rectangular pattern and are manually pulled on the ground to ensure the stability of the steel truss and prevent positional displacement during full welding. At the same time, the four steel wire ropes can also be used to quickly adjust the marking lines for alignment.

[0085] Example 5, based on one example, includes at least two sets of laser emitters on each modular steel truss. The laser emitters are installed on the corresponding modular steel truss, and their positions are parallel to the plane containing the centers of all modular steel trusses in each installation layer. The laser emitters on each modular steel truss in each installation layer are used to emit lasers, and their intersection points are located at the same point. When the upper and lower steel trusses are pre-assembled, the laser intersection points of the lower and upper layers coincide in the horizontal projection. After the modular steel trusses in that layer are installed, the laser intersection point is located directly above the center of the venue.

[0086] Example 6, based on one example, involves dividing the pre-assembled modules in each installation layer into at least three groups. This example selects three groups (including groups A, B, and C). At least one identical modular steel truss exists at both ends of every two adjacent groups of pre-assembled modules; as shown... Figure 1 and Figure 2 As shown, each group has a set of modular steel trusses reserved at both ends as a common reference between two adjacent pre-assembled modules, which facilitates the effective and precise combination of multiple sets of modular steel trusses. The distance between the laser emission intersection points on the upper and lower modular steel trusses of each pre-assembled module is equal to the distance between the laser emission intersection points of the upper and lower layers of the other two groups. This facilitates pre-assembly. Furthermore, during actual installation, adjacent groups share a set of identical modular steel trusses.

[0087] During the design phase, the joints of the modular steel truss in the upper layer to be installed can be staggered with those in the lower layer to be installed. This can optimize structural stress and improve structural mechanical performance and durability.

[0088] In one embodiment: such as Figures 4 to 9 As shown, a lifting frame 10 is installed on the hook of the truck crane, and two sets of clamping rods are provided at the bottom of the lifting frame 10;

[0089] A mounting base 20 is installed on the modular steel truss. The mounting base 20 is installed on the modular steel truss by means of pipe clamps, and a connecting groove 21 is provided on the mounting base 20.

[0090] The clamping rod is used to clamp the connecting groove 21 on the fixed mounting base 20.

[0091] The clamping rod includes a lower edge seat 11 and a hook rod 12. The lower edge seat 11 is installed on the bottom of the hanger 10. The lower edge seat 11 is provided with a downwardly angled guide hole. A guide bolt 13 is slidably installed in the guide hole. The guide bolt 13 is installed on the top outer side of the hook rod 12. The hook rod 12 moves obliquely relative to the lower edge seat 11. An extension seat 14 is provided at the bottom of the hook rod 12 away from the lower edge seat 11. A hook block 15 is provided at the bottom of the extension seat 14. The hook block 15 moves obliquely upward relative to the extension seat 14 to adjust the distance between the bottom and the top of the extension seat 14.

[0092] The hook block 15 is provided with a rotating rod 16 and a T-shaped slider 17. The rotating rod 16 has a Z-shaped structure, and the end away from the hook block 15 is the hook head 18.

[0093] The bottom of the extension seat 14 is provided with an upwardly sloping wedge-shaped surface, and the wedge-shaped surface is provided with a circulation guide groove and a T-shaped slide groove 19, and the T-shaped slider 17 and the T-shaped slide groove 19 slide in a sliding fit.

[0094] The back of the hook block 15 is provided with a T-shaped countersunk hole, and a connecting pin is installed in the T-shaped countersunk hole. The connecting pin is used for the T-shaped slider 17 to be placed in the T-shaped slide groove 19. The bottom of the T-shaped slide groove 19 is open.

[0095] The circulation guide channel includes an upward channel 110, a downward channel 111, an upward channel 2 112, and a downward channel 2 113. The outlet of the upward channel 110 and the inlet of the downward channel 2 113 intersect. The inlet of the upward channel 110 and the outlet of the downward channel 111 intersect. The outlet of the upward channel 2 112 and the inlet of the downward channel 2 113 intersect and are equal in height to the intersection point of the outlet of the upward channel 110 and the inlet of the downward channel 2 113. The outlet of the downward channel 111 and the inlet of the upward channel 2 112 intersect and the intersection point is lower than the intersection point of the outlet of the upward channel 2 112 and the inlet of the downward channel 2 113.

[0096] The inlet depth of the first upward channel 110, the first downward channel 111, the second upward channel 112, and the second downward channel 113 is greater than their respective outlet depths, and their respective inlet depths are all equal, and their respective outlet depths are all equal.

[0097] When the hook head 18 is located at the intersection of the outlet of the down channel 111 and the inlet of the up channel 112, the distance between the bottom of the hook block 15 and the top of the extension seat 14 meets the condition for entering the connecting groove 21.

[0098] When the hook head 18 is located at the intersection of the outlet of the downlink groove 113 and the inlet of the uplink groove 110, the distance between the bottom of the hook block 15 and the top of the extension seat 14 does not meet the conditions for entering the connecting groove 21.

[0099] The mounting base 20 is fixed to the modular steel truss by pipe clamps, and is generally set at the center or directly above the modular steel truss.

[0100] As the hanger 10 descends, the hook block 15 descends along with it and first contacts the mounting base 20, causing the hook head 18 to move upward from the outlet of the second descending groove and the inlet of the first ascending groove to the intersection of the outlets of the first descending groove and the first ascending groove. As it continues to descend, the hook block 15 moves outward along the guide hole together with the hook rod 12 and descends slowly. When it enters the position of the connecting groove 21, the hook block 15 descends relative to the hook rod 12, and the hook head 18 moves from the inlet of the first descending groove and the outlet of the first ascending groove to the intersection of the outlet of the first descending groove and the inlet of the second ascending groove. As it continues to descend, the extension seat 14 of the hook rod 12 enters the connecting groove 21 to realize the hooking operation.

[0101] The lifting frame 10 moves upward to lift the modular steel truss away until it is moved to the target position, and then assembled and welded.

[0102] As the hanger descends, the hook block 15 first acts on the bottom surface of the connecting groove 21, causing the hook head 18 to move from the intersection of the inlet of the upper groove 2 and the outlet of the lower groove 1 to the intersection of the outlet of the upper groove 2 and the inlet of the lower groove 2. Then, the hook block 15 and the extension seat 14 move outward until they are completely separated from the connecting groove 21. After separating from the connecting groove 21, the hook block 15 descends relative to the extension seat 14, and the hook head 18 moves to the intersection of the outlet of the lower groove 2 and the inlet of the upper groove 1. At this time, the distance between the bottom of the hook head 18 and the top of the extension seat 14 is greater than the size of the connecting groove 21, so that the hook head 18 and the extension seat 14 enter the connecting groove 21.

[0103] The hanger 10 moves upward, separating it from the modular steel truss. Then, the worker can remove the pipe clamp and mounting base 20.

[0104] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. The substitutions may be replacements of some structures, devices, or method steps, or they may be complete technical solutions. Equivalent substitutions or modifications made to the technical solutions and inventive concepts of the present invention should all be covered within the scope of protection of the present invention.

Claims

1. A method for rapid and precise modular installation of stadium steel trusses, comprising the following steps, characterized in that: Step 1: Modular Steel Truss Assembly After leveling the ground, the positioning lines of the jig are marked. The steel truss jig is assembled using a 25t truck crane. The main chord members of the truss are assembled and temporarily fixed. The secondary chord members are installed and temporarily fixed. The diagonal web members are installed to complete the modular assembly of the steel truss. Step 2: Marking the lines A total station was used to reposition and mark the four corners of the modular steel truss to be installed on each floor on the ground. Step 3: Modular pre-assembly of the lower steel truss Install leveling supports at the corresponding marked positions, and pre-assemble the modular steel truss on all leveling supports; Based on the gaps between the modular steel trusses, steel plates of appropriate size are selected for welding compensation or cutting to meet the design requirements, thus obtaining the lower pre-assembled modules; The top of the modular steel truss of the lower layer to be installed is trimmed and uniform, and distributed parallel to the corresponding adjustment supports; On the lower modular steel truss to be installed, the upper modular steel truss is pre-assembled using a 25t truck crane. Based on the gaps between the modular steel trusses to be installed on the upper layer, steel plates of appropriate size are selected for welding compensation or cutting to meet the design requirements, and the upper pre-assembled modules are obtained on the lower layer to be installed. Label the lower-level pre-assembled module and each module in the lower-level pre-assembled module; Make butt marking lines at the joints of the upper and lower pre-assembled modules; Separate the modules of the upper pre-assembled module according to the original modular joints; Separate the modules of the upper pre-assembled module according to the original modular joints; Step 4: Lifting Operation The pre-assembled and disassembled modular steel trusses were lifted and positioned according to their markings using a 500t truck crane, thus completing the assembly and fixing of the steel trusses for the lower layer to be installed. After adjusting the leveling supports to their corresponding positions, proceed with the next layer of pre-assembly. Repeat steps three and four until the steel truss of the venue is assembled. Assemble the steel truss at the joints of the upper and lower modular steel trusses according to the docking marking lines.

2. The modular, rapid, and precise installation method for stadium steel trusses according to claim 1, characterized in that: In step two, when assembling the modular structure of the upper layer to be installed on the modular steel truss of the lower layer to be installed, the upper and lower pre-assembled layers are parallel as a whole, and the centers of the lower layer to be installed and the upper layer to be installed are located in the same vertical line.

3. The modular, rapid, and precise installation method for stadium steel trusses according to claim 1, characterized in that: In step two, before pre-assembling the first-layer steel truss, a total station is used to mark the horizontal projection position of the center of the steel truss space frame installation layer on the ground, which meets the design requirements. This position serves as the foundation point for all subsequent layers to be installed. During the pre-assembly of the first-layer steel truss, pre-set foundation seats are installed on the grandstand, and the position and angle of all foundation seats meet the design requirements.

4. The modular, rapid, and precise installation method for stadium steel trusses according to claim 1, characterized in that: Each set of marking lines on the upper and lower modular steel trusses includes at least three lines, and after the three marking lines are fully aligned, they are directly welded together.

5. The modular, rapid, and precise installation method for stadium steel trusses according to claim 1, characterized in that: At least two sets of laser emitters are installed on each modular steel truss. The laser emitters are mounted on the corresponding modular steel truss and emit lasers with the intersection point located directly above the center of the venue.

6. The modular, rapid, and precise installation method for stadium steel trusses according to claim 1, characterized in that: The pre-assembled modules of each installation layer are divided into at least three groups, and there is at least one identical modular steel truss at both ends of each adjacent group of pre-assembled modules; The modular steel truss joints of the upper layer to be installed and the modular steel truss joints of the lower layer to be installed are staggered.

7. The modular, rapid, and precise installation method for stadium steel trusses according to claim 1, characterized in that: The truck crane has a lifting frame installed on its hook, and two sets of clamping rods are provided at the bottom of the lifting frame; The modular steel truss is equipped with mounting bases, which are installed on the modular steel truss via pipe clamps, and the mounting bases are provided with connecting grooves. The clamping rod is used to clamp the connecting groove on the mounting base.

8. The modular, rapid, and precise installation method for stadium steel trusses according to claim 7, characterized in that: The clamping rod includes a lower edge seat and a hook rod. The lower edge seat is installed on the bottom of the hanger and has a downward-sloping guide hole. A guide bolt is slidably installed in the guide hole and is installed on the top outer side of the hook rod. The hook rod moves obliquely relative to the lower edge seat. An extension seat is provided at the bottom of the hook rod away from the lower edge seat. A hook block is provided at the bottom of the extension seat and moves obliquely upward relative to the extension seat to adjust the distance between the bottom and the top of the extension seat.

9. A method for rapid and precise modular installation of stadium steel trusses according to claim 8, characterized in that: The hook block is equipped with a rotating rod and a T-shaped slider. The rotating rod has a Z-shaped structure, and the end away from the hook block is the hook head. The bottom of the extension seat is provided with an upwardly sloping wedge-shaped surface, and the wedge-shaped surface is provided with a circulation guide groove and a T-shaped slide groove, and the T-shaped slider and the T-shaped slide groove slide in a sliding fit. The circulation guide channel includes an upward channel 1, a downward channel 1, an upward channel 2, and a downward channel 2. The outlet of the upward channel 1 and the inlet of the downward channel 2 intersect. The inlet of the upward channel 1 and the outlet of the downward channel 1 intersect. The outlet of the upward channel 2 and the inlet of the downward channel 2 intersect and are equal in height to the intersection point of the outlet of the upward channel 1 and the inlet of the downward channel 2. The outlet of the downward channel 1 and the inlet of the upward channel 2 intersect and the intersection point is lower than the intersection point of the outlet of the upward channel 2 and the inlet of the downward channel 2.

10. A method for rapid and precise modular installation of stadium steel trusses according to claim 9, characterized in that: The inlet depths of the first upward channel, the first downward channel, the second upward channel, and the second downward channel are greater than their respective outlet depths, and their respective inlet depths are all equal, and their respective outlet depths are all equal. When the hook head is located at the intersection of the outlet of the down channel one and the inlet of the up channel two, the distance between the bottom of the hook block and the top of the extension seat meets the condition for entering the connecting groove. When the hook head is located at the intersection of the outlet of the downward channel 2 and the inlet of the upward channel 1, the distance between the bottom of the hook block and the top of the extension seat does not meet the conditions for entering the connecting groove.

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