A large-span thin-walled steel structure arc-shaped canopy has a wired overall hoisting construction method

Abstract

A kind of long-span thin-walled steel structure arc-shaped canopy has wired integral hoisting construction method, step 1: arc-shaped canopy ground splicing, hoisting frame assembly;Step 2: crane is in position, trial hoisting and waiting hoisting window period;Step 3: complete arc-shaped canopy hoisting, swivel, installation in place.The present application has less air swivel, hoisting process is stable, and safety factor is high.

Description

Technical Field

[0001] This invention belongs to the field of building construction, and particularly relates to steel structure hoisting. Background Technology

[0002] With the rapid development of my country's railway industry, China's high-speed rail development has attracted global attention in recent years and has become a shining national brand. It has received increasing attention. The scale and function of my country's early station buildings can no longer meet the various needs of passengers in the new era. More and more old station buildings are being renovated to meet the requirements of larger scale, better environment and more complete functions. As the scale of renovation becomes larger and the technology becomes more complex, the difficulty of station renovation is also increasing. Station renovation has become a trend in domestic station building construction.

[0003] However, for some hub stations with a large number of lines and busy trunk lines, due to the operational losses and various safety risks caused by the suspension of tracks, it is difficult to expand the scale of some stations in their original locations, so the renovation is abandoned. At present, this problem can only be solved by relocating the tracks, which will result in the loss of some transportation to achieve the goal.

[0004] Meanwhile, the steel structure of the hub station building has a large span, and thin-walled steel is used for vertical and horizontal assembly. Therefore, in order to ensure the safety of train operation and equipment, smooth transportation, and the smooth progress of station renovation construction, while also solving the key difficulties and problems that may arise during construction, and to achieve a balance between construction and transportation, satisfying both transportation and construction requirements, a wired construction method is urgently needed. Summary of the Invention

[0005] The purpose of this invention is to provide a wired overall hoisting construction method for a large-span thin-walled steel structure arc-shaped canopy, so as to solve the technical problem of rapid hoisting in wired construction.

[0006] To solve the above-mentioned technical problems, the specific technical solution of the present invention is as follows: A method for the wired overall hoisting construction of a large-span thin-walled steel structure arc-shaped canopy, characterized by the following steps: Step 1: Assemble the arched canopy floor and the hoisting frame; Step 2: Position the crane, conduct a trial lift, and wait for the lifting window. Step 3: Complete the hoisting, rotation, and positioning of the curved canopy.

[0007] Furthermore, in step 1, when splicing the arc-shaped canopy floor, it is necessary to determine the structural center of gravity and install lifting lugs on the top of the arc-shaped canopy, and assemble the hoisting frame according to the position of the lifting lugs on the arc-shaped canopy.

[0008] Furthermore, the hoisting frame includes a pair of lifting lugs and a horizontal brace. The lifting lugs are I-beams with several fixing holes. Several lifting lug supports are movably mounted on the lifting lugs. The lifting lug supports are rectangular frames with a pair of lifting lugs at the top. The lifting lug supports are fitted onto the lifting lugs and connected to the fixing holes by pins. The horizontal brace is X-shaped and is connected to the lifting lug via a connecting base.

[0009] Furthermore, the connecting base is V-shaped, with both ends located on both sides of the lifting lug bracket, and both ends of the connecting base are connected to the fixing holes; One of the lifting lugs on the lifting lug bracket is connected to the lifting lug on the arched canopy via a steel wire and a hoist, while the other lifting lug is connected to the crane hook via a steel wire and a hoist.

[0010] Furthermore, in step 2, the crane lifts the hoisting frame and the arched canopy, and the hoisting frame is adjusted to be horizontal by hand-operated hoists, and the elevation of the arched canopy is adjusted to the design state, ensuring that the lifting lug bracket and the lifting lug on the arched canopy are on the same vertical line; then, the component is lifted by about 50cm and left to stand still, waiting for the window to open.

[0011] Furthermore, in step 1, the position of the crane's rotation center is determined, and the position of the arc-shaped canopy ground splicing is determined by measuring instruments to ensure that the short columns of the arc-shaped canopy at the installation position and the splicing position are at the same rotation center, thereby reducing the aerial rotation during the hoisting process.

[0012] Furthermore, during the splicing of the arc-shaped canopy in step 1, a correction device is installed on the short column. The correction device includes a first correction arc and a second correction arc, which are connected to form a ring. The first correction arc and the second correction arc are provided with a limiting plate and a correction plate. The limiting plate is connected to the short column, and the correction plate is connected to the steel column through a jack.

[0013] Furthermore, the limiting plate is wedge-shaped and is engaged on the edge of the short column. The limiting plate is provided with several limiting grooves, one of which is provided with an adjusting screw. The adjusting screw is provided with an adjusting nut. The adjusting screw is connected to the first or second correction arc through a telescopic mechanism. The telescopic mechanism is U-shaped. The correction plate and the telescopic mechanism are distributed in a matrix on the circular structure formed by the connection of the first and second correction arcs. The correction plate is hung on the first correction arc or the second correction arc. The correction plate is provided with a clamp, which is connected to the correction plate by screws and engages with the first correction arc or the second correction arc. The clamp is provided with ear plates on both sides, and a pull rod is connected to the ear plates.

[0014] Furthermore, in step 3, during the hoisting and rotation process, the posture of the arc-shaped canopy is adjusted by a hand-operated hoist to maintain consistency with the designed posture for placement, and the deformation of the control points in each area of ​​this posture structure is measured and recorded. After the arched canopy is officially lifted, its aerial posture is maintained by two guy ropes connected to the arched canopy, which are distributed on both sides of the crane.

[0015] Furthermore, in step 1, the arched canopy is an asymmetrical, large-span, high-drop, irregular curved surface structure with a relatively complex spatial geometry. A full-size model was built using Tekla professional steel structure software to determine the distribution of the structural center of gravity and the lifting lugs. The structural stress and deformation of the arched canopy were analyzed using MIDAS software, and the full-process dynamic model of BIM technology was used to help determine the site layout.

[0016] The technical solution of the present invention has the following advantages: 1. Less aerial rotation, more stable hoisting process, and higher safety factor.

[0017] The device ensures accurate positioning and allows for quick fine-tuning after placement to complete the fixed installation, resulting in high overall efficiency.

[0018] By using a hoisting frame, lateral forces on the thin-walled steel structure are avoided, thus preventing damage to the steel structure during hoisting. Attached Figure Description

[0019] Figure 1 This is a top view of the arc-shaped canopy of the present invention. Figure 2 This is a schematic diagram of the arc-shaped canopy hoisting structure of the present invention; Figure 3 This is a schematic diagram of the structure of the arc-shaped canopy hoisting frame of the present invention; Figure 4 This is a front structural diagram of the lifting lug bracket of the present invention; Figure 5 This is a schematic diagram of the correction device structure of the present invention; Figure 6 Here is a schematic diagram of the structure of AA; Figure 7 This is a structural diagram of BB. Detailed Implementation

[0020] To better understand the purpose, structure, and function of this invention, the following detailed description, in conjunction with the accompanying drawings, provides a method for the wired overall hoisting construction of a large-span thin-walled steel arched canopy according to this invention.

[0021] In this application, the steel structure of the arc-shaped canopy of the high-speed rail hub station building has a large span and is an irregular arc-shaped structure (such as...). Figure 2 The side arc-shaped structure shown in the image was constructed by assembling it as a whole off-site and then hoisting it in one go. For example... Figure 1 The diagram shows a top view of the arched canopy 12. The arched canopy 12 is assembled from thin-walled steel plates arranged in a staggered horizontal and vertical pattern. This planar layout, combined with the arched side structure, results in an asymmetrical, large-span, high-drop, irregularly shaped curved surface structure with complex spatial geometry. While the structure has excellent longitudinal strength, its lateral strength is poor. If traditional hoisting methods are used, after installing the lifting lugs, the wire rope on the lugs will be at an angle to the hook, inevitably subjecting the thin-walled steel plates to a horizontal lateral force. Therefore, the structure is highly susceptible to collapse during hoisting due to lateral tension.

[0022] Example 1 like Figures 1-3 As shown, the present invention provides a wired integral hoisting construction method for a large-span thin-walled steel structure arc-shaped canopy, comprising the following steps: Step 1: Assemble the arched canopy 12 on the ground and the hoisting frame 11; Step 2: Position the crane, conduct a trial lift, and wait for the lifting window. Step 3: Complete the hoisting, rotation, and positioning of the curved canopy.

[0023] Specifically, in step 1, during the assembly of the curved canopy ground, a full-size model was created using Tekla professional steel structure software to determine the structural center of gravity and the distribution of the lifting lugs. The lifting lugs were then installed, and the lifting frame 11 was assembled based on the positions of the lifting lugs on the curved canopy. In addition, structural stress and deformation analysis of the curved canopy was performed using MIDAS software. The finite element analysis function in Midas was used to simulate the lifting process of this part of the structure, considering the impact of the construction process on the structural stress. The analysis was magnified by 1.2 times to account for the additional lifting effect; the load combination was assigned a partial factor of 1.5 to consider the construction load during the construction process. The analysis included D and 1.5D (where D is the structural self-weight). According to the calculation process, the maximum deformation of the curved canopy after installation was 43.06 mm.

[0024] In this embodiment, as Figure 3 and Figure 4 As shown, the hoisting frame 11 includes a pair of lifting lugs 112 and a horizontal brace 111. The lifting lugs 112 are I-beams with several fixing holes 114. The position of the lifting lug brackets 113 is adjusted through the fixing holes 114 so that the relative positions of the lifting lug brackets 113 and the corresponding lifting lugs on the curved canopy 12 are on the same vertical line, preventing lateral tension on the steel structure of the curved canopy 12 during hoisting. The lifting lug brackets 113 are rectangular frames with a pair of lifting lugs at the top. The lifting lug brackets 113 are fitted onto the lifting lugs 112 and connected to the fixing holes 114 by pins.

[0025] In the implementation of the technical solution of this application, the horizontal support 111 is X-shaped and is connected to the lifting lug 112 via the connecting base 115. The connecting base 115 is V-shaped, so that when connected to the lifting lug 112, both ends are located on both sides of the lifting lug bracket 113, avoiding interference with the lifting lug bracket 113. Both ends of the connecting base 115 are connected to the fixing holes 114.

[0026] Before hoisting, one of the lifting lugs on the lifting lug bracket 113 is connected to the lifting lug on the arched canopy 12 via steel wire and a hoist, while the other lifting lug is connected to the crane hook via steel wire and a hoist. After connection, the arched canopy 12 only receives longitudinal lifting from the hoisting frame 11, and all horizontal torque is borne by the hoisting frame 11, thus avoiding damage to the thin-walled steel structure during hoisting.

[0027] Specifically, in step 2, the crane lifts the hoisting frame 11 and the arched canopy 12 together. After lifting, the hoisting frame 11 is adjusted to be level using a hand-operated hoist, and the elevations at both ends of the arched canopy 12 are adjusted to the design level. It is ensured that the lifting lugs 113 and the lifting lugs on the arched canopy 12 are on the same vertical line. Afterwards, a trial lift of the component is conducted, raising it approximately 50cm off the ground, and then it is left to stand, awaiting the opening of the hoisting window. During wired construction, the hoisting window is 200 minutes. The hoisting, rotation, and positioning of the arched canopy 12 are completed within this limited time. Simultaneously, after installation, the hoisting machinery is moved out. This minimizes the impact on the existing railway line's operational functions and ensures normal train operation.

[0028] Specifically, in step 2, the BIM technology's full-process dynamic model is used to assist in determining the site layout and the crane's rotation center position. Measuring instruments are used to determine the ground splicing position of the curved canopy, ensuring that the short columns 6 of the curved canopy at the installation and splicing positions are at the same rotation center, reducing the aerial rotation of the curved canopy 12 during hoisting. During hoisting and rotation, guy ropes are installed on both sides of the curved canopy 12. These guy ropes control the relative posture of the curved canopy 12 and the crane boom, preventing excessive rotation of the curved canopy 12 during hoisting, improving hoisting and placement efficiency, and saving time.

[0029] Meanwhile, during the hoisting and rotation process, the attitude of the curved canopy 12 was adjusted by hand-operated hoists to maintain consistency with the designed orientation for placement. Deformation of the control points in each area of ​​this structure was measured and recorded to monitor the hoisting process and control risks.

[0030] Example 2 In this embodiment, as Figures 4-6As shown, during the splicing of the arc-shaped canopy in step 1, a correction device is installed on the short column 6. The correction device includes a first correction arc 1 and a second correction arc 2. Both the first correction arc 1 and the second correction arc 2 are semi-circular arcs. The two ends of the first correction arc 1 and the second correction arc 2 are connected by screws to form a ring. A limiting plate 3 and a correction plate 5 are provided on the first correction arc 1 and the second correction arc 2. The limiting plate 3 is connected to the short column 6, and the correction plate 5 is connected to the steel column 10 through a jack 9.

[0031] Specifically, in this embodiment, the limiting plate 3 is wedge-shaped and is fitted onto the edge of the short column 6. The limiting plate 3 has several limiting grooves 31, one of which is equipped with an adjusting screw 7. The adjusting screw 7 is equipped with an adjusting nut 71. The adjusting screw 7 is connected to the first correction arc 1 or the second correction arc 2 through a telescopic mechanism 4, which is U-shaped. Since the arc-shaped canopy 12 is arc-shaped, the space height above the short column 6 is different from that of the main structure. The structure of the limiting groove 31 can flexibly adjust the telescopic mechanism 4 to connect with different limiting grooves 31, control the installation height of the first correction arc 1 and the second correction arc 2, and avoid the possibility of interference between the correction device and different positions of the arc-shaped canopy 12.

[0032] In the specific application of this embodiment, the correction plate 5 and the telescopic mechanism 4 are matrix-distributed on the circular structure formed by the first correction arc 1 and the second correction arc 2, and are connected to form a triangular whole by the tie rod 8, ensuring the stability of the structure. When using the jack, the force can be evenly transmitted to the circular structure formed by the first correction arc 1 and the second correction arc 2, ensuring structural stability. The correction plate 5 is hung on the first correction arc 1 or the second correction arc 2. The correction plate 5 is provided with a clamp 51, which is connected to the correction plate 5 by screws and engages with the first correction arc 1 or the second correction arc 2. The clamp 51 has ear plates 52 on both sides, and the tie rod 8 is connected to the ear plates 52.

[0033] When the short column 6 is 200mm away from the top of the positioning column, after the surveyor reports that the axis deviation of the control point position is within 15mm, the arc-shaped canopy 12 begins to be positioned as a whole. After the arc-shaped canopy 12 is in place, the relative position of the short column 6 and the positioning column is corrected by installing jacks 9 on the correction plate 5 and using jacks 9 to push.

[0034] A single arched canopy 12 typically has 8 main connection points (short column 6 and positioning column). These 8 points are adjusted synchronously and in coordination. During adjustment, the correction plate 5 is rotated to adjust positions with larger deviations. After adjusting the deviation to within specifications, the connecting screws of the first correction arc 1 and the second correction arc 2 are removed, and the correction device is taken off. Alternatively, the correction device can remain in place, and the first correction arc 1 and the second correction arc 2 can be used to position the welding machine, ensuring weld quality and reducing the workload of welding workers.

[0035] Electric welding machines were used for butt welding of the steel columns of the arc-shaped canopy. During the butt welding process, the positioning and adjustment of the secondary butt joints were carried out simultaneously. After the main butt joints of the steel columns were welded three times (the total welding length of the three times was not less than 200 mm) and the effective weld width was not less than 5 mm, the hooks of the arc-shaped canopy 12 were removed.

[0036] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. A method for the wired overall hoisting construction of a large-span, thin-walled steel structure arc-shaped canopy, characterized in that... The steps include: Step 1: Ground splicing of the arc-shaped canopy (12) and assembly of the hoisting frame (11); Step 2: Positioning of the crane, trial hoisting and waiting for the hoisting window period; Step 3: Completion of hoisting, rotation and positioning of the arc-shaped canopy; In Step 1, when the arc-shaped canopy (12) is ground spliced, the center of gravity of the structure is determined and lifting lugs are installed on the arc-shaped canopy (12). The hoisting frame (11) is assembled according to the position of the lifting lugs on the arc-shaped canopy; The hoisting frame (11) includes a pair of lifting lug frames (112) and a horizontal brace (111). The lifting lug frame (112) is an I-beam. The lifting lug frame (112) is provided with several fixing holes (114). Several lifting lug supports (113) are movably provided on the lifting lug frame (112). The lifting lug supports (113) are rectangular. The frame is shaped like a box with a pair of lifting lugs on top. The lifting lug bracket (113) is fitted onto the lifting lug frame (112) and connected to the fixing hole (114) by a pin. The horizontal support (111) is X-shaped and connected to the lifting lug frame (112) by a connecting base (115). The connecting base (115) is V-shaped, with both ends located on both sides of the lifting lug bracket (113). Both ends of the connecting base (115) are connected to the fixing hole (114). One of the lifting lugs on the lifting lug bracket (113) is connected to the lifting lug on the arc-shaped canopy (12) by a steel wire and a hoist, and the other lifting lug is connected to the crane hook by a steel wire and a hoist. In step 2, the crane lifts the lifting frame (11) and the arc-shaped canopy (12) and adjusts the lifting frame (11) to the desired height by hand-operated hoist. Level and adjust the elevation of the arc-shaped canopy (12) to the design state, and ensure that the lifting lug bracket (113) and the lifting lug on the arc-shaped canopy (12) are on the same vertical line; then perform a trial lifting of the component by 50cm and place it still, waiting for the window; in step 1, determine the position of the crane rotation center, determine the ground splicing position of the arc-shaped canopy by measuring instruments, and ensure that the short column (6) of the arc-shaped canopy at the installation position and the splicing position are on the same rotation center to reduce the air rotation during the hoisting process; in step 1, during the splicing of the arc-shaped canopy, install a correction device on the short column (6), the correction device includes a first correction arc (1) and a second correction arc (2), the first correction arc (1) and the second correction arc (2) are connected to form a ring, the first correction arc (1) and the second correction arc (2) The correction arc (2) is provided with a limiting plate (3) and a correction plate (5). The limiting plate (3) is connected to the short column (6), and the correction plate (5) is connected to the steel column (10) through a jack. The limiting plate (3) is wedge-shaped and is locked on the edge of the short column (6). The limiting plate (3) is provided with several limiting grooves (31). One of the limiting grooves (31) is provided with an adjusting screw (7). The adjusting screw (7) is provided with an adjusting nut (71). The adjusting screw (7) is connected to the first correction arc (1) or the second correction arc (2) through a telescopic mechanism (4). The telescopic mechanism (4) is Z-shaped. The correction plate (5) and the telescopic mechanism (4) are matrix-distributed on the circular ring structure formed by the first correction arc (1) and the second correction arc (2).The correction plate (5) is hung on the first correction arc (1) or the second correction arc (2). The correction plate (5) has a locking head (51), which is connected to the correction plate (5) by screws and engages with the first correction arc (1) or the second correction arc (2). Ear plates (52) are provided on both sides of the locking head (51), and a pull rod (8) is connected to the ear plates (52).

2. The wired integral hoisting construction method for a large-span thin-walled steel structure arc-shaped canopy according to claim 1, characterized in that, In step 3, during the hoisting and rotation process, the attitude of the arc-shaped canopy (12) is adjusted by hand-operated hoist to maintain consistency with the design attitude of the landing, and the deformation of the control points of each area of ​​this attitude structure is measured and recorded; after the arc-shaped canopy is officially hoisted, the attitude of the arc-shaped canopy in the air is maintained by the two guy ropes connected to the arc-shaped canopy, and the two guy ropes are distributed on both sides of the crane.

3. The wired integral hoisting construction method for a large-span thin-walled steel structure arc-shaped canopy according to claim 2, characterized in that, In step 1, the arched canopy is an asymmetrical, large-span, high-drop, irregular curved surface structure with complex spatial geometry. A full-size model was built using Tekla professional steel structure software to determine the distribution of the structural center of gravity and the lifting lugs. The structural stress and deformation analysis of the arched canopy was performed using MIDAS software, and the BIM technology was used to create a full-process dynamic model to help determine the site layout.

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