High-altitude construction method for large-span asymmetric arc-shaped steel structure

Abstract

The invention belongs to the technical field of large-span steel structures, and discloses a high-altitude construction method for a large-span asymmetric arc-shaped steel structure, which comprises the following steps of: firstly, assembling units to be mounted on the ground, and mounting the assembled units to be mounted on an assembling jig frame so as to facilitate subsequent lifting and mounting operation; and then the to-be-installed unit is reinforced, the to-be-lifted points are arranged on the to-be-installed unit, then the lifting frame is installed, and the to-be-installed unit is integrally lifted through the lifting frame, so that the aloft work amount is reduced, the construction efficiency is improved, and meanwhile the construction cost is reduced. And then inlaying installation is carried out between the to-be-installed unit and the main body structure, so that the stability and the safety of the whole structure are improved. And finally, stress release is conducted on the installed to-be-installed unit, and therefore the installation operation of the to-be-installed unit is completed. By means of the arrangement, the high-altitude construction method of the large-span asymmetric arc-shaped steel structure can efficiently and accurately achieve installation operation of the to-be-installed unit, and the construction cost is low.

Description

Technical Field

[0001] The invention relates to the technical field of large-span steel structures, and in particular to a high-altitude construction method for a large-span asymmetric arc-shaped steel structure. Background Art

[0002] At present, the shapes of circular building structures are becoming more and more diverse, and the traditional large-span closed structure system can no longer meet the requirements of wide, three-dimensional and transparent building effects. Therefore, an open circular (arc-shaped) structure system composed of steel trusses has emerged to achieve the ultimate transparent building curtain wall effect, but it also brings great difficulties to the structural construction. Figure 1 As shown, the unit 100 to be installed is in an arc shape as a whole, and the center of gravity of the whole structure is offset, which is an asymmetric structure. In actual construction, its application span can reach 120m, and the structure installation height is 50m, so its construction method and deformation accuracy control requirements are relatively high.

[0003] For the above-mentioned open circular ring (arc) structural system, the traditional installation method of large-span steel structure adopts the method of "temporary support + high-altitude scattered assembly" or "overall lifting at both ends", but the former requires the setting of a large number of ultra-high temporary supports, the construction is cumbersome and inefficient, and it will also lead to an increase in the overall construction cost. If the method of "overall lifting at both ends" is adopted, since the unit 100 to be installed itself is an asymmetric structure, it will cause the lifting center of gravity to be offset and cause the risk of instability, and due to the large span of the structure, the construction deformation accuracy control of the structure is also difficult to guarantee.

[0004] Therefore, there is an urgent need for a high-altitude construction method for a large-span asymmetric curved steel structure to solve the above technical problems. Summary of the invention

[0005] The purpose of the present invention is to provide a high-altitude construction method for a large-span asymmetric arc-shaped steel structure, which can efficiently and accurately realize the installation operation of the units to be installed and has a low construction cost.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] A high-altitude construction method for a large-span asymmetric arc-shaped steel structure, comprising:

[0008] Step 1: Assemble the units to be installed on the ground, and install the assembled units to be installed on the assembly frame;

[0009] Step 2: Reinforce the unit to be installed;

[0010] Step 3: Set multiple lifting points on the unit to be installed;

[0011] Step 4: Install the lifting frame;

[0012] Step 5: Lift the unit to be installed as a whole using the lifting frame;

[0013] Step 6: Perform patching installation between the unit to be installed and the main structure;

[0014] Step 7: After installation, release the stress of the unit to be installed.

[0015] Optionally, in step 1, the unit to be installed includes a plurality of assembling pieces, a pre-arching value of each assembling piece is calculated, and the unit to be installed is assembled on the ground according to the pre-arching value.

[0016] Optionally, in step two, a reinforcement piece is detachably installed on the unit to be installed, the reinforcement piece includes a transverse reinforcement rod, and a plurality of transverse reinforcement rods are provided. The unit to be installed includes an upper frame and a lower frame connected to each other, the upper frame and the lower frame are facing each other and are arranged at intervals, and a plurality of transverse reinforcement rods are staggered between the upper frame and the lower frame, one end of the transverse reinforcement rod is connected to the upper frame, and the other end is connected to the lower frame.

[0017] Optionally, the reinforcement member further includes a longitudinal reinforcement rod, and a plurality of longitudinal reinforcement rods are provided, and the plurality of longitudinal reinforcement rods are arranged at intervals along the circumference of the unit to be installed, and one end of the longitudinal reinforcement rod is connected to the upper frame, and the other end is connected to the lower frame.

[0018] Optionally, in step three, the unit to be installed is an arc-shaped structure, and multiple lifting points are respectively provided at both ends of the arc-shaped extension. The arc structure is an inner arc segment and an outer arc segment along the radial direction. The inner arc segment is provided with multiple lifting points along its own extension direction, and the outer arc segment is provided with multiple lifting points along its own extension direction.

[0019] Optionally, in step four, the main structure includes a plurality of arc-shaped units that are spaced apart and have the same arc center, and the lifting frame includes a side independent lifting frame and a mid-span portal lifting frame. The side independent lifting frame is arranged at both ends of the arc-shaped unit along the arc extension, and the mid-span portal lifting frame is arranged between two adjacent arc-shaped units.

[0020] Optionally, a plurality of spaced-apart mid-span portal lifting frames are provided between two adjacent arc-shaped units, and the two adjacent mid-span portal lifting frames are fixedly connected by a fixed truss.

[0021] Optionally, in step six, the coordinates of the docking points between the installation unit and the main structure are measured and located, and the patching sections are processed to the installation length according to the coordinates of the docking points.

[0022] Optionally, the patching section is hoisted to a predetermined height, and the patching section is hooked on the main structure by a manual hoist.

[0023] Optionally, a stress and strain sensor is provided on the unit to be installed, and the stress and strain sensor is communicatively connected to the control unit, and the control unit can control the movement of the lifting frame.

[0024] Beneficial effects of the present invention:

[0025] The present invention provides a high-altitude construction method for a large-span asymmetric arc-shaped steel structure. First, the units to be installed are assembled on the ground to utilize the stable environment and construction conditions of the ground to improve the assembly accuracy and efficiency, and the assembled units to be installed are installed on the assembly frame for subsequent lifting and installation operations. Then the units to be installed are reinforced to enhance their overall rigidity and stability, and ensure that the units to be installed will not deform or become unstable during the construction process. Then, multiple lifting points to be lifted are set on the units to be installed to evenly distribute the lifting force to avoid the instability of the units to be installed during the lifting process, and then the lifting frame is installed, and the units to be installed are lifted as a whole by the lifting frame to reduce the amount of high-altitude operations, improve construction efficiency, and reduce construction costs. Then, the units to be installed and the main structure are embedded and installed to improve the stability and safety of the overall structure. Finally, the units to be installed after installation are released from stress, thereby completing the installation operation of the units to be installed. Through the above-mentioned settings, the high-altitude construction method of the large-span asymmetric arc-shaped steel structure of the present application can efficiently and accurately realize the installation operation of the units to be installed, and the construction cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic diagram of the cross-sectional structure of the unit to be installed;

[0027] Figure 2 It is a flow chart of a high-altitude construction method of a large-span asymmetric arc-shaped steel structure provided by an embodiment of the present invention;

[0028] Figure 3 is a schematic diagram of a unit to be installed provided by an embodiment of the present invention being installed on an assembly tire frame;

[0029] Figure 4 is a first schematic diagram of reinforcing a unit to be installed provided by an embodiment of the present invention;

[0030] Figure 5 is a second schematic diagram of a reinforced unit to be installed provided by an embodiment of the present invention;

[0031] Figure 6 is a schematic diagram of the installation of a lifting frame provided by an embodiment of the present invention;

[0032] Figure 7 is a top view of a lifting unit to be installed provided by an embodiment of the present invention;

[0033] Figure 8 is a first schematic diagram of lifting a unit to be installed provided by an embodiment of the present invention;

[0034] Fig. 9 is a second schematic diagram of lifting a unit to be installed provided by an embodiment of the present invention;

[0035] Fig.10 It is a schematic diagram of the patch installation between the unit to be installed and the main structure provided by an embodiment of the present invention;

[0036] Fig.11 is a first schematic diagram of installing a patching section provided by an embodiment of the present invention;

[0037] Fig.12 is a second schematic diagram of installing a patching section provided in an embodiment of the present invention;

[0038] Fig.13 3 is a third schematic diagram of installing a patching section provided in an embodiment of the present invention.

[0039] In the figure:

[0040] 100. Unit to be installed; 101. Upper frame; 102. Lower frame; 200. Main structure; 201. Arc unit; 1. Assembly frame; 2. Lifting frame; 21. Side independent lifting frame; 22. Mid-span door-type lifting frame; 23. Fixed truss; 3. Reinforcement; 31. Horizontal reinforcement rod; 32. Longitudinal reinforcement rod; 4. Inlay section; 5. Manual hoist. DETAILED DESCRIPTION

[0041] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0042] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0044] In the description of this embodiment, the terms "upper", "lower", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0045] At present, the shapes of circular building structures are becoming more and more diverse, and the traditional large-span closed structure system can no longer meet the requirements of wide, three-dimensional and transparent building effects. Therefore, an open circular (arc-shaped) structure system composed of steel trusses has emerged to achieve the ultimate transparent building curtain wall effect, but it also brings great difficulties to the structural construction. Figure 1 As shown, the unit 100 to be installed is in an arc shape as a whole, and the center of gravity of the whole structure is offset, which is an asymmetric structure. In actual construction, its application span can reach 120m, and the structure installation height is 50m, so its construction method and deformation accuracy control requirements are relatively high.

[0046] For the above-mentioned open circular ring (arc) structural system, the traditional installation method of large-span steel structure adopts the method of "temporary support + high-altitude scattered assembly" or "overall lifting at both ends", but the former requires the setting of a large number of ultra-high temporary supports, the construction is cumbersome and inefficient, and it will also lead to an increase in the overall construction cost. If the method of "overall lifting at both ends" is adopted, since the unit 100 to be installed itself is an asymmetric structure, it will cause the lifting center of gravity to be offset and cause the risk of instability, and due to the large span of the structure, the construction deformation accuracy control of the structure is also difficult to guarantee.

[0047] like Figure 1-Figure 13 As shown, this embodiment provides a high-altitude construction method for a large-span asymmetric arc-shaped steel structure, which includes:

[0048] Step 1: assemble the units to be installed 100 on the ground, and install the assembled units to be installed 100 on the assembly frame 1.

[0049] Step 2: Reinforce the unit 100 to be installed.

[0050] Step 3: Set a plurality of lifting points on the unit 100 to be installed.

[0051] Step 4: Install lifting frame 2.

[0052] Step 5: lift the unit 100 to be installed as a whole by using the lifting frame 2.

[0053] Step 6: Perform patch installation between the unit to be installed 100 and the main structure 200.

[0054] Step 7: performing stress relief on the installed unit 100.

[0055] In this embodiment, the unit 100 to be installed is first assembled on the ground to utilize the stable environment and construction conditions of the ground to improve the assembly accuracy and efficiency, and the assembled unit 100 to be installed is installed on the assembly frame 1 to facilitate subsequent lifting and installation operations. Then the unit 100 to be installed is reinforced to enhance its overall rigidity and stability to ensure that the unit 100 to be installed will not deform or become unstable during the construction process. Then, multiple lifting points are set on the unit 100 to evenly distribute the lifting force to avoid the unit 100 to be installed from becoming unstable during the lifting process, and then the lifting frame 2 is installed to lift the unit 100 to be installed as a whole through the lifting frame 2 to reduce the amount of high-altitude work, improve construction efficiency, and reduce construction costs. Then, the unit 100 to be installed is embedded and installed between the main structure 200 to improve the stability and safety of the overall structure. Finally, the stress of the installed unit 100 is released to complete the installation of the unit 100. Through the above arrangement, the high-altitude construction method of the large-span asymmetric arc-shaped steel structure of this embodiment can efficiently and accurately realize the installation operation of the unit 100 to be installed, and the construction cost is relatively low.

[0056] Specifically, if Figure 2 and Figure 3As shown, in step one, the unit 100 to be installed includes a plurality of assemblies, the pre-arching value of each assembling piece is calculated, and the unit 100 to be installed is assembled on the ground according to the pre-arching value. The pre-arching value refers to the deflection or deformation amount that may be generated by the assembling piece in the final installation position due to factors such as the dead weight of the structure, the load effect, and the temperature change during the construction process. By using computer simulation construction software (such as Synchro4D / 5D construction simulation software, STAADPro and SAP2000, etc.), the deformation of the assembling piece in the subsequent stages of assembly, lifting, unloading, etc. is analyzed, so as to calculate its pre-arching value, which can ensure that when the unit 100 to be installed is assembled on the ground, each assembling piece can be pre-adjusted according to its final installation state, so as to reduce or eliminate the deformation that may be generated during the installation and use process, which is conducive to improving the construction accuracy and efficiency.

[0057] It should be noted that the assembly tire frame 1 includes a base, support rods and diagonal braces, wherein a plurality of support rods are provided, and the plurality of support rods are arranged on the base and connected by diagonal braces to form a frame structure. The assembly tire frame 1 mainly plays a load-bearing role for the installation unit 100, and technicians in this field are clear about the specific structure and working principle of the assembly tire frame 1, which will not be repeated here.

[0058] Specifically, if Figure 2-Figure 5 As shown, in step 2, the reinforcement member 3 is detachably installed on the unit 100 to be installed, which not only facilitates the installation and removal of the reinforcement member 3 during the construction process, but also helps to flexibly adjust the unit 100 to be installed. The reinforcement member 3 includes a transverse reinforcement rod 31, and a plurality of transverse reinforcement rods 31 are provided. The unit 100 to be installed includes an upper frame 101 and a lower frame 102 connected to each other. The upper frame 101 and the lower frame 102 are arranged opposite to each other and spaced apart. A plurality of transverse reinforcement rods 31 are staggered between the upper frame 101 and the lower frame 102. One end of the transverse reinforcement rod 31 is connected to the upper frame 101, and the other end is connected to the lower frame 102. The upper frame 101 and the lower frame 102 can be effectively connected and supported, thereby improving the overall rigidity and stability of the unit 100 to be installed, and preventing it from being deformed or unstable during the construction process.

[0059] More specifically, if Figure 5 As shown, the reinforcement member 3 also includes a longitudinal reinforcement rod 32, and a plurality of longitudinal reinforcement rods 32 are provided. The plurality of longitudinal reinforcement rods 32 are arranged at intervals along the circumference of the unit to be installed 100, and the longitudinal reinforcement rods 32 cooperate with the transverse reinforcement rods 31 to form a support frame. One end of the longitudinal reinforcement 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 anti-deformation ability of the unit to be installed 100 under complex stress conditions.

[0060] It can be understood that, according to the characteristics of the offset center of gravity of the unit 100 to be installed, by providing transverse reinforcement rods 31 and longitudinal reinforcement rods 32, the center of gravity of the unit 100 to be installed is evenly distributed, reducing the asymmetry of its structure, which is not only beneficial to improving the overall rigidity of the unit 100 to be installed, but also facilitates subsequent lifting and installation operations.

[0061] Specifically, in step three, the unit 100 to be installed is an arc-shaped structure, and a plurality of points to be lifted are respectively arranged at both ends of the arc-shaped extension to ensure that the lifting force can be evenly distributed during the lifting process, and to avoid structural damage or deformation of the unit 100 to be installed due to excessive force on a single point. The arc-shaped structure is divided into an inner arc segment and an outer arc segment along the radial direction, and the inner arc segment is provided with a plurality of points to be lifted along its own extension direction, and the outer arc segment is provided with a plurality of points to be lifted along its own extension direction, so that the deformation and stress distribution of the unit 100 to be installed during the lifting process can be more accurately controlled, and the arc-shaped structure can be lifted smoothly and safely.

[0062] More specifically, on the two end faces of the arc-shaped structure of the unit to be installed 100 along the arc-shaped extension, multiple points to be lifted are symmetrically arranged about the axis of the arc-shaped structure to ensure uniform force on the unit to be installed 100 during the lifting process, thereby ensuring construction safety. In this embodiment, two points to be lifted are respectively arranged at both ends of the arc-shaped structure along the arc-shaped extension, and the inner arc segment and the outer arc segment are respectively arranged at their own three-divided points to meet the actual lifting needs of the unit to be installed 100. In other embodiments, the specific number and position of the points to be lifted can be adjusted according to actual needs, and no excessive restrictions are made here, as long as the above-mentioned functions can be achieved.

[0063] Specifically, Figure 2-Figure 6 As shown, in step 4, the main structure 200 includes a plurality of arc-shaped units 201 arranged at intervals and having the same arc center. In order 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 method of combining a side independent lifting frame 21 and a mid-span door-type lifting frame 22: the lifting frame 2 includes a side independent lifting frame 21 and a mid-span door-type lifting frame 22. The side independent lifting frame 21 is arranged at both ends of the 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 mid-span door-type lifting frame 22 is arranged between two adjacent arc-shaped units 201, and has a large span and a strong 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 the deformation or instability of the unit 100 to be installed due to uneven force is avoided.

[0064] More specifically, if Figure 2-Figure 7As shown, a plurality of 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 to be installed 100. The two adjacent mid-span gantry lifting frames 22 are fixedly connected by a fixed truss 23, which can effectively connect the plurality of mid-span gantry lifting frames 22 into an integral structure, enhance the rigidity and stability of the entire structure, not only improve the safety of the unit to be installed 100 during the lifting process, but also help reduce the risk of structural damage caused by excessive force on a single mid-span gantry lifting frame 22.

[0065] More specifically, a plurality of arc-shaped units 201 are arranged to form an annular structure. In the orthographic projection on the ground, one end of the mid-span portal lifting frame 22 extends into the inner circle of the annular structure, and the other end is placed outside the annular structure, which is equivalent to the mid-span portal lifting frame 22 spanning the inner and outer sides of the main structure 200, which not only helps to improve the stability and safety of the operation, but also facilitates the subsequent installation and docking operations of the unit 100 to be installed. Among them, one end of the mid-span portal lifting frame 22 adopts a square tower form, which has greater rigidity and bearing capacity, and can effectively support the weight of the unit 100 to be installed. The other end of the mid-span portal lifting frame 22 adopts a triangular tower form, which not only reduces the weight of the tower, but also helps to improve the stability of the tower. In addition, a steel structure foundation is provided at the bottom of the tower, and is connected to the steel structure foundation through a bored cast-in-place pile foundation, so that a firm connection is formed between the tower and the foundation, ensuring the safety of the lifting operation.

[0066] Specifically, in step five, a crane is provided on the lifting frame 2, and the unit to be installed 100 is lifted by the crane. In other embodiments, the lifting operation of the unit to be installed 100 can also be achieved by a jack or a winch, which is not limited here. It should be noted that during the lifting process of the unit to be installed 100, the stress and strain of each component in the unit to be installed 100 and the displacement of the overall structure are timely observed and recorded by visual inspection or finite element analysis to ensure the safety and accuracy of the construction operation.

[0067] Specifically, if Figure 2-Figure 10 As shown, in step six, the coordinates of the docking points between the unit to be installed 100 and the main structure 200 are measured and located by a total station or a fully automatic three-dimensional scanning measuring instrument to ensure the accuracy of the measurement results. Then, according to the coordinates of the docking points, the patching section 4 is processed to the installation length. Since the patching section 4 is a key component connecting the unit to be installed 100 and the main structure 200, its length and shape need to accurately match the requirements of the docking points. Such a setting ensures the docking accuracy between the unit to be installed 100 and the main structure 200 and the stability of the overall structure, so as to facilitate subsequent installation work.

[0068] Specifically, if Figure 2-Figure 13 As shown, after the patching segment 4 is processed, the patching segment 4 is lifted to a predetermined height by a crane (or tower crane) or other device, and the patching segment 4 is hooked on the main structure 200 by a manual hoist 5, so that the patching segment 4 can be slowly pulled toward the main structure 200 by manually operating the chain or handle of the hoist, and the patching segment 4 is aligned with the docking point to ensure the connection accuracy between the unit 100 to be installed and the main structure 200.

[0069] It should be noted that if Figure 11-13 As shown, during the installation of the patching segment 4, since the patching segment 4 cannot be normally advanced at the lower chord position of the main structure 200, the wire rope is loosened by the crane to reduce the upward pulling force of the patching segment 4, and the manual hoist 5 is tightened to accurately control the position and posture of the patching segment 4, so that the patching segment 4 reaches the installation position below the lower chord position of the main structure 200.

[0070] Specifically, a stress strain sensor is provided on the unit to be installed 100, and the stress strain sensor is communicatively connected to the control unit, and the control unit can control the action of the lifting frame 2. It can be understood that the stress strain sensor can accurately sense the strain and stress changes generated by the unit to be installed 100 when it is 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 will dynamically adjust the lifting speed, height, position and other parameters of the lifting frame 2 according to the force conditions of the unit to be installed 100, so as to ensure that the unit to be installed 100 can be lifted smoothly and safely and docked with the main structure 200. Among them, the stress strain sensor can adopt a resistive or capacitive stress strain sensor, and the control unit can adopt a PLC or a computer, that is, as long as the above-mentioned functions can be achieved, the specific structure of the above-mentioned components will not be limited too much.

[0071] like Figure 1-Figure 13As shown, it should be noted that this embodiment provides a high-altitude construction method for a large-span asymmetric arc-shaped steel structure. First, by setting a reinforcement 3, the unit to be installed 100 (i.e., the arc-shaped steel structure) with an overall offset center of gravity forms a temporary closed structure with a relatively high overall rigidity, so as to facilitate subsequent lifting operations; secondly, according to the structural characteristics of the unit to be installed 100, a lifting point is set at a corresponding position so that the unit to be installed 100 obtains better stability during the lifting process; then, an interlocking installation is performed between the unit to be installed 100 and the main structure 200 to eliminate the errors generated during the ground assembly and lifting of the unit to be installed 100; finally, after the interlocking section 4 is installed and the unit to be installed 100 is correctly installed, the lifting frame 2 and the reinforcement 3 and other components are disassembled to achieve stress release, thereby completing the installation of the overall structure. Through the above-mentioned settings, the high-altitude construction method for a large-span asymmetric arc-shaped steel structure of this embodiment ensures the stability of the overall structure during the installation process, reduces the risk of instability of the arc-shaped steel structure during the lifting operation, and improves the installation accuracy, which is conducive to reducing construction errors.

[0072] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A high-altitude construction method for a large-span asymmetric arc-shaped steel structure, characterized in that: include: Step 1: assembling the units to be installed (100) on the ground, and installing the assembled units to be installed (100) on the assembly frame (1); Step 2: reinforcing the unit to be installed (100); Step 3: setting a plurality of lifting points on the unit to be installed (100); Step 4: Install the lifting frame (2); Step 5: hoist the unit to be installed (100) as a whole by means of the lifting frame (2); Step 6: Perform patching installation between the unit to be installed (100) and the main structure (200); Step 7: performing stress relief on the installed unit (100).

2. The high-altitude construction method of a large-span asymmetric arc-shaped steel structure according to claim 1 is characterized in that: In step one, the unit to be installed (100) comprises a plurality of assembling pieces, a pre-arching value of each assembling piece is calculated, and the unit to be installed (100) is assembled on the ground according to the pre-arching value.

3. The high-altitude construction method of a large-span asymmetric arc-shaped steel structure according to claim 1 is characterized in that: In step 2, a reinforcement member (3) is detachably mounted on the unit (100) to be installed, the reinforcement member (3) comprises a transverse reinforcement rod (31), a plurality of transverse reinforcement rods (31) are provided, the unit (100) to be installed comprises an upper frame (101) and a lower frame (102) connected to each other, the upper frame (101) and the lower frame (102) are arranged facing each other and spaced apart, a plurality of transverse reinforcement rods (31) are staggeredly arranged between the upper frame (101) and the lower frame (102), one end of the transverse reinforcement rod (31) is connected to the upper frame (101), and the other end is connected to the lower frame (102).

4. The high-altitude construction method of a large-span asymmetric arc-shaped steel structure according to claim 3 is characterized in that: The reinforcement member (3) also includes a longitudinal reinforcement rod (32), a plurality of longitudinal reinforcement rods (32) are provided, and the plurality of longitudinal reinforcement rods (32) are arranged at intervals along the circumference of the unit to be installed (100), one end of the longitudinal reinforcement rod (32) is connected to the upper frame (101), and the other end is connected to the lower frame (102).

5. The high-altitude construction method of a large-span asymmetric arc-shaped steel structure according to claim 1 is characterized in that: In step three, the unit to be installed (100) is an arc-shaped structure, and multiple lifting points are respectively provided at both ends of the arc-shaped extension. The arc-shaped structure is an inner arc segment and an outer arc segment along the radial direction. The inner arc segment is provided with multiple lifting points along its own extension direction, and the outer arc segment is provided with multiple lifting points along its own extension direction.

6. The high-altitude construction method of a large-span asymmetric arc-shaped steel structure according to claim 1 is characterized in that: In step 4, the main structure (200) includes a plurality of arc-shaped units (201) arranged at intervals and having the same arc center, and the lifting frame (2) includes a side independent lifting frame (21) and a mid-span door-type lifting frame (22), the side independent lifting frame (21) is arranged at both ends of the arc-shaped unit (201) extending along the arc, and the mid-span door-type lifting frame (22) is arranged between two adjacent arc-shaped units (201).

7. The high-altitude construction method of a large-span asymmetric arc-shaped steel structure according to claim 6 is characterized in that: A plurality of spaced-apart mid-span door-type lifting frames (22) are provided between two adjacent arc-shaped units (201), and the two adjacent mid-span door-type lifting frames (22) are fixedly connected via a fixed truss (23).

8. The high-altitude construction method of a large-span asymmetric arc-shaped steel structure according to claim 1 is characterized in that: In step six, the coordinates of the docking points between the installation unit (100) and the main structure (200) are measured and located, and the inlay section (4) is processed to the installation length according to the coordinates of the docking points.

9. The high-altitude construction method of a large-span asymmetric arc-shaped steel structure according to claim 8 is characterized in that: The patching section (4) is hoisted to a predetermined height, and the patching section (4) is hooked onto the main structure (200) by means of a manual hoist (5).

10. The high-altitude construction method of a large-span asymmetric arc-shaped steel structure according to any one of claims 1 to 9, characterized in that: A stress and strain sensor is provided on the unit to be installed (100), and the stress and strain sensor is communicatively connected to the control unit, and the control unit can control the movement of the lifting frame (2).

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