High-altitude construction method for long-span asymmetric curved steel structure

Abstract

A high-altitude construction method for a long-span asymmetric curved steel structure. The method comprises: first, assembling units to be mounted on the ground, and mounting the assembled units on an assembly jig frame; then, reinforcing the units, providing a plurality of points to be lifted on the units, and subsequently mounting a lifting frame; next, integrally lifting the units by means of the lifting frame to a position corresponding to a main body structure, and carrying out infill mounting between the units and the main body structure; and finally, performing stress release on the units after the mounting is completed, thereby completing the mounting operation of the units.

Description

High-altitude construction methods for large-span asymmetric curved steel structures

[0001] This application claims priority to Chinese Patent Application No. 202411911160.1, filed with the Chinese Patent Office on December 24, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of large-span steel structure technology, for example to a high-altitude construction method for a large-span asymmetrical arc-shaped steel structure. Background Technology

[0003] Currently, the shapes of circular building structures are becoming increasingly diverse, and traditional large-span closed structural systems can no longer meet the requirements for a spacious, three-dimensional, and transparent architectural effect. Therefore, open-type circular (arc-shaped) structural systems composed of steel trusses have emerged to achieve an extremely transparent building curtain wall effect, but this also brings greater challenges to structural construction.

[0004] For open-type circular (arc) structural systems, the traditional installation method for large-span steel structures requires the setting of a large number of ultra-high temporary supports, which is cumbersome and inefficient, leading to an increase in overall construction costs. Furthermore, the need to raise the center of gravity can cause instability due to the offset of the center of gravity. In addition, due to the large span of the structure, it is difficult to guarantee the precision control of the construction deformation.

[0005] Therefore, there is an urgent need for a high-altitude construction method for large-span asymmetric arc steel structures to solve the above-mentioned technical problems. Summary of the Invention

[0006] This application provides a high-altitude construction method for a large-span asymmetric curved steel structure, including:

[0007] Step 1: Assemble the unit to be installed on the ground and install the assembled unit onto the assembly frame;

[0008] Step 2: Reinforce the unit to be installed;

[0009] Step 3: Set multiple lifting points on the unit to be installed;

[0010] Step 4: Install the lifting frame;

[0011] Step 5: Use a lifting frame to lift the unit to be installed as a whole to the position corresponding to the main structure;

[0012] Step 6: Install the unit to be installed between the main structure and the installation unit;

[0013] Step 7: Perform stress relief on the installed unit.

[0014] Optionally, in step one, the unit to be installed includes multiple assembly parts, the pre-camber value of each assembly part is calculated, and the unit to be installed is assembled on the ground according to the pre-camber value of each assembly part.

[0015] Optionally, in step two, the reinforcement component is detachably installed on the unit to be installed. The reinforcement component includes multiple horizontal reinforcing rods. The unit to be installed includes an upper frame and a lower frame that are connected to each other. The upper frame and the lower frame face each other and are spaced apart. Multiple horizontal reinforcing rods are staggered between the upper frame and the lower frame. One end of each horizontal reinforcing rod is connected to the upper frame and the other end is connected to the lower frame.

[0016] Optionally, the reinforcement also includes multiple longitudinal reinforcing rods, which are spaced apart circumferentially along the unit to be installed. One end of each longitudinal reinforcing rod is connected to the upper frame and the other end is connected to the lower frame.

[0017] Optionally, in step three, the unit to be installed is an arc-shaped structure. The arc-shaped structure has multiple lifting points at both ends along the arc. The arc-shaped structure has an inner arc segment and an outer arc segment along the radial direction. The inner arc segment has multiple lifting points along its own extension direction, and the outer arc segment has multiple lifting points along its own extension direction.

[0018] Optionally, in step four, the main structure includes multiple arc-shaped units spaced apart and having the same arc center, and the lifting frame includes multiple independent side lifting frames and multiple mid-span gantry lifting frames. Each independent side lifting frame is located at both ends of the corresponding arc-shaped unit extending along the arc, and the multiple mid-span gantry lifting frames are located between two adjacent arc-shaped units.

[0019] Optionally, multiple spaced-apart mid-span gantry lifting frames are provided between two adjacent arc-shaped units, and two adjacent mid-span gantry lifting frames are fixedly connected by a fixed truss.

[0020] Optionally, in step six, the coordinates of the docking points between the unit to be installed and the main structure are measured and located, and the patch section is machined to the installation length based on the coordinates of the docking points.

[0021] Optionally, the patch section is hoisted to a predetermined height and hooked onto the main structure using a manual hoist.

[0022] Optionally, the unit to be installed is equipped with a stress and strain sensor, which is communicatively connected to the control unit, and the control unit can control the movement of the lifting frame. Attached Figure Description

[0023] Figure 1 is a cross-sectional structural diagram of the unit to be installed provided in this application;

[0024] Figure 2 is a flowchart of the high-altitude construction method for a large-span asymmetric arc steel structure provided in the embodiments of this application;

[0025] Figure 3 is a schematic diagram of the unit to be installed on the assembly frame according to an embodiment of this application;

[0026] Figure 4 is a first schematic diagram of the reinforced unit to be installed provided in an embodiment of this application;

[0027] Figure 5 is a second schematic diagram of the reinforced unit to be installed provided in an embodiment of this application;

[0028] Figure 6 is a schematic diagram of the installation of the lifting frame provided in an embodiment of this application;

[0029] Figure 7 is a top view of the lifting unit to be installed provided in an embodiment of this application;

[0030] Figure 8 is a cross-sectional view along direction A of the lifting unit to be installed provided in an embodiment of this application;

[0031] Figure 9 is a cross-sectional view along direction B of the lifting unit to be installed provided in an embodiment of this application;

[0032] Figure 10 is a schematic diagram of the interlocking installation between the unit to be installed and the main structure provided in the embodiment of this application;

[0033] Figure 11 is a first schematic diagram of the installation interpolation segment provided in an embodiment of this application;

[0034] Figure 12 is a second schematic diagram of the installation patch segment provided in an embodiment of this application;

[0035] Figure 13 is a third schematic diagram of the installation patch segment provided in an embodiment of this application.

[0036] In the diagram: 100, Unit to be installed; 101, Upper frame; 102, Lower frame; 1001, Diagonal brace; 200, Main structure; 201, Arc-shaped unit; 1, Assembly frame; 11, Base; 12, Support rod; 13, Horizontal bar; 2, Lifting frame; 21, Side independent lifting frame; 22, Mid-span portal lifting frame; 23, Fixed truss; 3, Reinforcing member; 31, Transverse reinforcing rod; 32, Longitudinal reinforcing rod; 4, Insertion section; 41, Connection point; 5, Manual hoist; 6, Lifting point. Detailed Implementation

[0037] In the description of this application, unless otherwise expressly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0038] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0039] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 application. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0040] Currently, the shapes of circular building structures are becoming increasingly diverse, and traditional large-span closed structural systems can no longer meet the requirements for a spacious, three-dimensional, and transparent architectural effect. Therefore, open-type circular (arc-shaped) structural systems composed of steel trusses have emerged to achieve an extremely transparent building curtain wall effect, but this also brings significant challenges to structural construction. As shown in Figure 1, the unit to be installed, 100, is arc-shaped, and the center of gravity of the overall structure is offset, making it an asymmetrical structure. In actual construction, its application span can reach 120m, and the structural installation height is 50 meters, thus requiring high standards for construction methods and deformation precision control.

[0041] For the aforementioned open-type circular (arc) structural system, the traditional installation methods for large-span steel structures are either "temporary support + high-altitude assembly" or "overall lifting at both ends". However, the former requires a large number of ultra-high temporary supports, which is cumbersome and inefficient, and also increases the overall construction cost. If the "overall lifting at both ends" method is used, the installation unit 100 in the large-span steel structure is itself an asymmetrical structure, which will cause the center of gravity to be offset during lifting and lead to instability risk. In addition, due to the large span of the structure, it is difficult to guarantee the accuracy of the construction deformation control.

[0042] As shown in Figures 1-13, this embodiment provides a high-altitude construction method for a large-span asymmetric arc-shaped steel structure, which includes:

[0043] Step 1: Assemble the unit to be installed 100 on the ground and install the assembled unit to be installed 100 on the assembly frame 1.

[0044] Step 2: Reinforce the unit to be installed 100.

[0045] Step 3: Set multiple lifting points 6 on the unit to be installed 100.

[0046] Step 4: Install lifting frame 2.

[0047] Step 5: Use the lifting frame 2 to lift the unit 100 to be installed as a whole to the position corresponding to the main structure 200.

[0048] Step 6: Install the unit 100 to be installed between the main structure 200 and the installation unit 100.

[0049] Step 7: Perform stress relief on the installed unit 100.

[0050] In this embodiment, the large-span asymmetric arc-shaped steel structure includes a unit 100 to be installed. First, the unit 100 is assembled on the ground to utilize the stable environment and construction conditions, improving assembly accuracy and efficiency. The assembled unit 100 is then installed on the assembly jig 1 for subsequent lifting and installation. Next, the unit 100 is reinforced to enhance its overall rigidity and stability, ensuring it will not deform or become unstable during construction. Then, multiple lifting points 6 are set on the unit 100 to evenly distribute the lifting force and prevent instability during lifting. A lifting frame 2 is then installed to lift the unit 100 as a whole, reducing high-altitude work, improving construction efficiency, and lowering construction costs. Next, the unit 100 is interlocked with the main structure 200 to improve the overall stability and safety of the structure. Finally, stress is released from the installed unit 100, completing the installation process. With the above settings, the high-altitude construction method for the large-span asymmetric arc steel structure in this embodiment can efficiently and accurately realize the installation of the unit 100 to be installed, with low construction cost.

[0051] For example, as shown in Figures 2 and 3, in step one, the unit 100 to be installed includes multiple assembly components. The pre-camber value of each assembly component is calculated, and the unit 100 is assembled on the ground according to the pre-camber value of each component. The pre-camber value refers to the deflection or deformation that the assembly component may experience at its final installation position due to factors such as structural self-weight, load action, and temperature changes during construction. By using computer simulation construction software to analyze the deformation of the assembly components at each stage of assembly, lifting, and unloading, and thus calculating the pre-camber value of each component, it is possible to ensure that each assembly component can be pre-adjusted according to its final installation state during ground assembly of the unit 100, thereby reducing or eliminating possible deformation during installation and use, and thus improving construction accuracy and efficiency.

[0052] It should be noted that the assembly frame 1 includes a base 11, support rods 12 and horizontal rods 13. Multiple support rods 12 are provided and are set on the base 11 and connected by the horizontal rods 13 to form a frame structure. The assembly frame 1 mainly serves to bear the load of the unit 100 to be installed. Those skilled in the art are clear about the specific structure and working principle of the assembly frame 1, and will not be described in detail here.

[0053] For example, as shown in Figures 2-5, in step two, the reinforcement member 3 is detachably installed on the unit 100 to be installed. This not only facilitates the installation and disassembly of the reinforcement member 3 during construction, but also helps to flexibly adjust the unit 100 to be installed. The unit 100 to be installed includes an upper frame 101 and a lower frame 102, which face each other and are spaced apart, as shown in Figure 4. The upper frame 101 and the lower frame 102 are connected to the reinforcement member 3 by multiple diagonal braces 1001. The reinforcement member 3 includes multiple transverse reinforcing rods 31, which are staggered between the upper frame 101 and the lower frame 102. One end of each transverse reinforcing rod 31 is connected to the upper frame 101, and the other end is connected to the lower frame 102. This effectively connects and supports the upper frame 101 and the lower frame 102, thereby improving the overall rigidity and stability of the unit 100 to be installed and preventing deformation or instability during construction.

[0054] For example, as shown in Figure 5, the reinforcement component 3 also includes longitudinal reinforcing rods 32. Multiple longitudinal reinforcing rods 32 are provided, spaced apart circumferentially along the unit 100 to be installed. The longitudinal reinforcing rods 32 cooperate with the transverse reinforcing rods 31 to form a support frame. One end of each longitudinal reinforcing rod 32 is connected to the upper frame 101, and the other end is connected to the lower frame 102, thereby enhancing the stability and deformation resistance of the unit 100 under complex stress conditions.

[0055] Understandably, given the offset center of gravity of the unit 100 to be installed, by setting the transverse reinforcing rod 31 and the longitudinal reinforcing rod 32, the center of gravity of the unit 100 to be installed is evenly distributed, reducing the degree of structural asymmetry. This not only helps to improve the overall rigidity of the unit 100 to be installed, but also facilitates subsequent lifting and installation operations.

[0056] For example, in step three, the unit 100 to be installed is an arc-shaped structure. Multiple lifting points 6 are provided at both ends of the arc-shaped structure to ensure that the lifting force is evenly distributed during the lifting process, preventing structural damage or deformation of the unit 100 due to excessive force at a single point. The arc-shaped structure has an inner arc segment and an outer arc segment along its radial direction. Multiple lifting points 6 are provided on both the inner and outer arc segments along their respective extension directions. This allows for more precise control of the deformation and stress distribution of the unit 100 during the lifting process, ensuring that the arc-shaped structure can be lifted smoothly and safely.

[0057] For example, on the two end faces of the arc-shaped structure of the unit to be installed 100 extending along the arc, multiple lifting points 6 are symmetrically arranged about the axis of the arc-shaped structure to ensure the uniformity of force on the unit to be installed 100 during the lifting process, thereby ensuring construction safety. In this embodiment, two lifting points 6 are respectively provided at each end of the arc-shaped structure extending along the arc, while the inner arc segment and the outer arc segment are respectively provided at their trisection points to meet the actual lifting requirements of the unit to be installed 100. In other embodiments, the specific number and position of the lifting points can be adjusted according to actual needs, and are not limited here, as long as the above-mentioned functions can be achieved.

[0058] For example, as shown in Figures 2-6, in step four, the main structure 200 includes multiple spaced arc-shaped units 201 with the same arc center. To ensure that the unit 100 to be installed can be lifted smoothly and safely and accurately docked with the main structure 200, this embodiment adopts a combination of side-independent lifting frames 21 and mid-span gantry lifting frames 22: The lifting frame 2 includes multiple side-independent lifting frames 21 and multiple mid-span gantry lifting frames 22. Each side-independent lifting frame 21 is located at both ends of the corresponding arc-shaped unit 201 extending along the arc, and can independently control and lift the side part of the unit 100 to be installed. The multiple mid-span gantry lifting frames 22 are located between two adjacent arc-shaped units 201, and have a large span and strong load-bearing capacity, and can simultaneously support and lift the middle part of the unit 100 to be installed. Through the above arrangement, the stability of the unit 100 to be installed during the lifting process is ensured, and deformation or instability of the unit 100 to be installed due to uneven force is avoided.

[0059] For example, as shown in Figures 2-7, multiple spaced-apart mid-span gantry lifting frames 22 are provided between two adjacent arc-shaped units 201 to meet the lifting requirements of the middle part of the unit 100 to be installed. Adjacent mid-span gantry lifting frames 22 are fixedly connected by a fixed truss 23, which effectively connects multiple mid-span gantry lifting frames 22 into a whole structure, enhancing the rigidity and stability of the entire structure. This not only improves the safety of the unit 100 to be installed during the lifting process but also helps reduce the risk of structural damage caused by excessive stress on a single mid-span gantry lifting frame 22.

[0060] For example, multiple arc-shaped units 201 are arranged to form a ring structure. In the orthographic projection on the ground, one end 221 of the mid-span gantry lifting frame 22 extends into the inner side of the ring structure along its cross-section, while the other end 222 is positioned on the outer side of the ring structure along its cross-section. This means the mid-span gantry lifting frame 22 spans both the inner and outer sides of the main structure 200, which not only improves the stability and safety of the lifting operation but also facilitates the subsequent installation and docking of the unit 100 to be installed. One end 221 of the mid-span gantry lifting frame 22 adopts a square tower form, which has greater rigidity and load-bearing capacity, effectively supporting the weight of the unit 100 to be installed. The other end 222 of the mid-span gantry lifting frame 22 adopts a triangular tower form, which not only reduces the weight of the tower but also helps improve its stability. Furthermore, the bottom of the tower is provided with a steel structure foundation, which is connected to the steel structure foundation through drilled pile foundations, forming a solid connection between the tower and the ground, ensuring the safety of the lifting operation.

[0061] For example, in step five, a crane is installed on the lifting frame 2, and the crane is used to lift the unit 100 to be installed. In other embodiments, jacks or winches can also be used to lift the unit 100 to be installed, which is not limited here. It should be noted that during the lifting process of the unit 100 to be installed, the stress and strain of each component in the unit 100 to be installed, as well as the displacement of the overall structure, should be observed and recorded in a timely manner through visual inspection or finite element analysis to ensure the safety and accuracy of the construction operation.

[0062] For example, as shown in Figures 2-10, in step six, the coordinates of the docking point 41 between the unit to be installed 100 and the main structure 200 are measured and located using a total station or a fully automatic 3D scanning measuring instrument to ensure the accuracy of the measurement results. Then, based on the coordinates of the docking point, the insert segment 4 is machined to the installation length. Since the insert segment 4 is a key component connecting the unit to be installed 100 and the main structure 200, its length and shape need to precisely match the requirements of the docking point. This setting ensures the docking accuracy between the unit to be installed 100 and the main structure 200 and the stability of the overall structure, facilitating subsequent installation work.

[0063] For example, as shown in Figures 2-13, after the patch section 4 is processed, the patch section 4 is lifted to a predetermined height by a crane (or tower crane) or other device, and the patch section 4 is hooked onto the main structure 200 by a manual hoist 5, so that the patch section 4 can be slowly pulled toward the main structure 200 by manually operating the chain or handle of the hoist, and the patch section 4 is aligned with the docking point to ensure the connection accuracy between the unit 100 to be installed and the main structure 200.

[0064] It should be noted that, as shown in Figures 11-13, during the installation of the patch section 4, since the patch section 4 cannot guarantee normal advance at the lower chord position of the main structure 200, the steel wire rope is loosened by the crane to reduce the upward tension of the patch section 4, and the manual hoist 5 is tightened to precisely control the position and posture of the patch section 4, so that the patch section 4 reaches the installation position below the lower chord position of the main structure 200.

[0065] For example, the unit to be installed 100 is equipped with a stress-strain sensor, which is communicatively connected to the control unit. The control unit can control the movement of the lifting frame 2. It is understood that the stress-strain sensor can accurately sense the strain and stress changes generated in the unit to be installed 100 when subjected to force and transmit the data to the control unit. During the lifting and installation process of the unit to be installed 100, the control unit dynamically adjusts the lifting speed, height, and position parameters of the lifting frame 2 according to the force applied to the unit to be installed 100, to ensure that the unit to be installed 100 can be lifted smoothly and safely and docked with the main structure 200. The stress-strain sensor can be a resistive or capacitive stress-strain sensor, and the control unit can be a programmable logic controller (PLC) or a computer; that is, any component capable of performing the above functions is acceptable. No specific structural limitations are imposed on the components described herein.

[0066] As shown in Figures 1-13, it should be noted that this embodiment provides a high-altitude construction method for a large-span asymmetrical arc-shaped steel structure. First, by setting reinforcement components 3, the installation unit 100 (i.e., the arc-shaped steel structure) with an offset center of gravity forms a temporary closed structure with high overall rigidity to facilitate subsequent lifting operations. Second, based on the structural characteristics of the installation unit 100, lifting points are set at corresponding positions to improve the stability of the installation unit 100 during lifting. Then, interlocking installation is performed between the installation unit 100 and the main structure 200 to eliminate errors generated during ground assembly and lifting. Finally, after the interlocking section 4 is installed and the installation unit 100 is correctly installed, the lifting frame 2 and reinforcement components 3 are disassembled to release stress, thereby completing the installation of the overall structure. Through the above-mentioned settings, the high-altitude construction method for the large-span asymmetric arc-shaped steel structure in this embodiment ensures the stability of the overall structure during installation, reduces the risk of instability of the arc-shaped steel structure during lifting operations, and improves installation accuracy, which helps to reduce construction errors.

Claims

1. High-altitude construction methods for large-span asymmetrical curved steel structures, including: Step 1: Assemble the unit to be installed (100) on the ground and install the assembled unit to be installed (1) on the assembly frame (1); Step 2: Reinforce the unit to be installed (100); Step 3: Set multiple lifting points (6) on the unit to be installed (100); Step 4: Install the lifting frame (2); Step 5: Use the lifting frame (2) to lift the unit (100) to be installed as a whole to the position corresponding to the main structure (200); Step 6: Perform interlocking installation between the unit to be installed (100) and the main structure (200); Step 7: Perform stress relief on the installed unit (100).

2. The method according to claim 1, wherein, In step one, the unit to be installed (100) includes multiple assembly parts. The pre-camber value of each assembly part is calculated, and the unit to be installed (100) is assembled on the ground according to the pre-camber value of each assembly part.

3. The method according to claim 1, wherein, In step two, the reinforcement component (3) is detachably installed on the unit to be installed (100). The reinforcement component (3) includes multiple horizontal reinforcement bars (31). The unit to be installed (100) includes an upper frame (101) and a lower frame (102) connected to each other. The upper frame (101) and the lower frame (102) face each other and are spaced apart. Multiple horizontal reinforcement bars (31) are staggered between the upper frame (101) and the lower frame (102). One end of each horizontal reinforcement bar (31) is connected to the upper frame (101) and the other end is connected to the lower frame (102).

4. The method according to claim 3, wherein, The reinforcement component (3) also includes multiple longitudinal reinforcement rods (32), which are spaced apart circumferentially along the unit to be installed (100). One end of each longitudinal reinforcement rod (32) is connected to the upper frame (101), and the other end is connected to the lower frame (102).

5. The method according to claim 1, wherein, In step three, the unit to be installed (100) is an arc-shaped structure. Multiple lifting points (6) are provided at both ends of the arc-shaped structure. The arc-shaped structure is divided into an inner arc segment and an outer arc segment in the radial direction. Multiple lifting points (6) are provided in the inner arc segment along its own extension direction, and multiple lifting points (6) are provided in the outer arc segment along its own extension direction.

6. The method of claim 1, wherein, In step four, the main structure (200) includes multiple arc-shaped units (201) spaced apart and with the same arc center, and the lifting frame (2) includes multiple independent side lifting frames (21) and multiple mid-span gantry lifting frames (22). Each independent side lifting frame (21) is located at both ends of the corresponding arc-shaped unit (201) extending along the arc, and the multiple mid-span gantry lifting frames (22) are located between two adjacent arc-shaped units (201).

7. The method of claim 6, wherein, Multiple mid-span portal lifting frames (22) are provided between two adjacent arc-shaped units (201), and two adjacent mid-span portal lifting frames (22) are fixedly connected by a fixed truss (23).

8. The method of claim 1, wherein, In step six, the coordinates of the docking point between the unit to be installed (100) and the main structure (200) are measured and located. Based on the coordinates of the docking point, the insert section (4) is processed to the installation length.

9. The method of claim 8, wherein, The patch (4) is hoisted to a predetermined height and hooked to the main structure (200) by a manual hoist (5).

10. The method of any one of claims 1-9, wherein, The stress-strain sensor is arranged on the unit (100) to be installed, and the stress-strain sensor is in communication connection with the control unit, and the control unit can control the action of the lifting frame (2).

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