Construction method for integrally lifting large-span net rack with structural joints

Abstract

The invention discloses an integral lifting construction method for a large-span net rack with structural joints. The integral lifting construction method comprises the following steps: 1, splicing the net rack; 2, arranging a lifting point; 3, temporary lifting point arrangement; 4, connection of the lifting lifting point and the temporary lifting point; 5, a trial lifting stage; 6, lifting is suspended; 7, formal lifting; 8, dismounting the lifting hoisting point and the temporary hoisting point; by means of the construction method, the grid structure is integrally lifted after being assembled, the high-altitude lifting workload is reduced to the maximum extent, the construction period is guaranteed, the use amount of temporary facilities is reduced, the construction cost is reduced, and meanwhile lifting equipment is small in size, light in self weight, large in bearing capacity and suitable for large-tonnage component lifting in a narrow space or a room.

Description

Technical Field

[0001] The invention belongs to the technical field of building construction, and in particular relates to a method for integrally lifting a large-span grid with structural seams. Background Art

[0002] With the continuous development of my country's building steel structure, the requirements for span, space and other aspects of various types of building space steel structures are also constantly increasing. Large-span grid structures are widely used in large-scale building roof structures such as gymnasiums, exhibition centers, and speed skating halls due to their advantages such as light weight, large span, large coverage area, low material consumption, and short construction period. At present, there are two main construction and installation methods commonly used for large-span steel structures: one is to assemble directly at the high-altitude design installation position or to slide to the design position after assembling at high altitude, such as high-altitude bulk method, high-altitude sliding method, etc.; the other is to assemble on the ground first and then install it step by step to the design position, such as segmented hoisting method.

[0003] However, for a large-span grid structure with structural seams, this type of large-span grid structure has the following problems in installation technology and actual on-site construction: 1. The grid structure is huge, the grid nodes are a mixture of bolt balls and welded balls, the node styles are diverse, the structure assembly volume is large, and the workload of high-altitude lifting is large; 2. The grid lifting area and connecting rods are heavy, and the bearing capacity requirements for temporary supports such as tire frames are high, and the safety and quality of high-altitude bulk loading are difficult to guarantee; 3. The working surface at the construction site of the large-span grid structure is small, making it difficult to use the sliding construction method. Summary of the invention

[0004] The purpose of the present invention is to solve the above-mentioned technical problems existing in the prior art, and to provide a large-span grid with structural joints. The overall lifting construction method is provided. Through the lifting platform on the concrete structure column, temporary lifting points are installed at positions corresponding to the lifting lifting points on the grid structure lifting units, and are connected through special bottom anchors and special steel strands. The two lifting units are synchronously lifted to the designed installation elevation using a lifting device to complete the installation of the steel structure, minimize the workload of high-altitude lifting, reasonably set the load-bearing lifting points, and ensure the safety of the lifting process.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A method for integrally lifting a large-span grid with structural joints, characterized by comprising the following steps:

[0007] 1) Grid assembly: First, assemble two lifting units with structural joints on the floor directly below the grid structure projection surface. The two lifting units are lifted synchronously. Then, according to the position of the concrete structure column on site, the lifting points are symmetrically set on the horizontal and vertical sides of the two lifting units.

[0008] 2) Arrangement of lifting points: First, install a lifting platform on the concrete structure column according to the set lifting point position. The lifting platform corresponds to the position of the lifting point and is fixed on the concrete structure column. After the lifting platform is installed, an adjustment mechanism is installed on the lifting platform. The initial position of the adjustment mechanism is located at one end of the lifting platform close to the concrete structure column. After the adjustment mechanism is installed, install the lifting equipment on the adjustment mechanism. After the lifting equipment is installed in place, immediately use a temporary pressure plate to clamp the lifting equipment and fix the lifting equipment. After the lifting equipment is installed, install a guide frame at the rear of the lifting equipment, and then move the lifting equipment and the guide frame to the position corresponding to the lifting point through the adjustment mechanism;

[0009] 3) Arrangement of temporary hanging points: First, according to the position of the lifting point of the lifting unit and the position of the lifting point, an auxiliary support mechanism is installed on the floor. After the auxiliary support mechanism is installed, the temporary hanging point is supported on the auxiliary support mechanism, and then the height of the temporary hanging point is adjusted by lifting or lowering the auxiliary support mechanism. After the height of the temporary hanging point is adjusted to correspond to the lifting unit, the temporary hanging point is connected to the lifting unit through a temporary rod to complete the arrangement of the temporary hanging point;

[0010] 4) Connection between the lifting point and the temporary lifting point: After the lifting point and the temporary lifting point are installed, the lifting point and the temporary lifting point are connected through the bottom anchor and the steel strand. The bottom anchor is installed at the bottom end of the temporary lifting point. After the bottom anchor is installed, it is immediately fixed with a temporary support plate. One end of the temporary support plate is fixed to the bottom end of the temporary lifting point, and the other end is clamped with the bottom anchor. The steel strand passes through the hollow part of the bottom anchor and the temporary sling and extends upward. The lifting equipment is slid and fine-tuned through the adjustment mechanism so that the steel strand can pass through the through-notch of the adjustment mechanism, pass through the top of the lifting equipment, fall on the guide frame behind the lifting equipment, and extend a certain length;

[0011] 5) Trial promotion stage

[0012] a. After the lifting point is connected to the temporary lifting point, check whether all devices are in normal operation and whether they meet the lifting requirements, ensure the connection between the lifting equipment and the power source, and start trial lifting after confirmation;

[0013] b. Load the lifting unit step by step in the order of 20%, 40%, 60%, 70%, 80%, 90%, 95% and 100% of the design load during lifting. During the process of graded loading, the lifting is suspended after each step of graded loading is completed, and the deformation of the lifting point structure, temporary lifting point structure and lifting unit before and after loading is checked. After ensuring that the lifting unit is stable, continue with the next step of graded loading until the lifting unit is separated from the assembly frame;

[0014] 6) Pause lifting: After the lifting unit is lifted about 100mm, stop lifting and keep the lifting unit in the air for 2 to 24 hours to conduct a comprehensive inspection of the hanging point structure, load-bearing system and lifting equipment. After ensuring that all inspections are correct, prepare for formal lifting;

[0015] 7) Formal promotion

[0016] a. Fine-tune the elevation of each lifting point of the lifting unit through the lifting equipment to make the lifting unit in the designed posture, check whether there are any abnormalities in the lifting equipment, lifting points and temporary lifting points, and after confirming that there are no abnormalities, keep the lifting unit in the designed posture and start the formal lifting;

[0017] b. When the lifting unit is lifted to a distance of about 500-1000mm from the design elevation, stop lifting, fine-tune the lifting points to accurately lift the lifting unit to the design elevation, suspend the lifting equipment, keep the lifting unit in the air, and then make up the rods to make the lifting unit structure form an overall stable force system;

[0018] c. The lifting equipment shall be unloaded in stages in the order of 95%, 90%, 80%, 70%, 60%, 50%, 40% and 20% of the design load until the steel strands become loose;

[0019] 8) Removal of lifting points and temporary lifting points: After the lifting unit is lifted into place, the lifting equipment, adjustment mechanism, lifting points, temporary lifting points and auxiliary support mechanisms are removed to complete the overall lifting operation of the grid structure.

[0020] Further, in step 3 and step 4, the temporary hanging point includes a temporary bottom plate, a temporary welding ball, a temporary sleeve and a temporary rod, the temporary sleeve is installed on the temporary bottom plate, the temporary welding ball is sleeved on the temporary sleeve, the temporary sleeve is provided with a hollow channel, the hollow channel is used for the steel strand to pass through, one end of the temporary rod is fixed to the temporary welding ball, the other end of the temporary rod is fixed to the lifting point of the lifting unit, and the temporary hanging point is also provided with a reinforcement plate, the reinforcement plate is arranged on the temporary bottom plate and the temporary sleeve, and the reinforcement plate is located between the temporary bottom plate and the temporary welding ball;

[0021] The bottom anchor is provided with a bottom anchor base, and the temporary bottom plate is provided with an installation base. The bottom anchor is abutted against the installation base through the bottom anchor base. The temporary support plate includes a first welding surface, a first abutting surface and a second abutting surface. The temporary support plate is welded to the temporary bottom plate through the first welding surface. The first abutting surface presses against the installation base, and the second abutting surface presses against the bottom anchor bottom plate.

[0022] Further, in step 3, the auxiliary support mechanism includes a lifting cylinder, a fixed rod, a telescopic rod and a support ring, the fixed rod is provided with a hollow slide groove, the telescopic rod is slidably arranged in the hollow slide groove, the lifting cylinder is connected to the telescopic rod, the lifting cylinder controls the telescopic rod to slide along the hollow slide groove, the top of the telescopic rod is provided with a fixed block 1, the support ring is provided with a fixed block 2, and the support ring is fixed to the telescopic rod through the fixed block 1 and the fixed block 2;

[0023] The auxiliary support mechanism also includes a locking structure, which is used to lock the fixed rod and the telescopic rod. The locking mechanism includes an elongated hole, a locking through hole and a locking bolt. The elongated hole is arranged on the fixed rod, and the locking through hole is arranged on the telescopic rod. The locking bolt passes through the locking through hole and slides along the elongated hole. The locking of the fixed rod and the telescopic rod is achieved by the locking bolt.

[0024] Further, the auxiliary support mechanism also includes a support base plate, the support base plate is provided with a fixing through hole 1, the support base plate is fixed by combining the fixing through hole 1 with the fixing bolt 1, the fixing rod is provided with a fixing foot, the fixing foot is provided with a fixing through hole 2, the fixing rod is fixed to the support base plate by combining the fixing through hole 2 with the fixing bolt 2;

[0025] The supporting base plate is provided with a supporting seat 1, the supporting seat 1 is installed with a supporting shaft 1, one end of the lifting cylinder is hinged to the supporting shaft 1, a supporting seat 2 is provided on one side of the telescopic rod, the supporting seat 2 is installed with a supporting shaft 2, and one end of the lifting cylinder is hinged to the supporting shaft 2.

[0026] Furthermore, in step 2, the lifting platform includes a platform beam, a front column, a rear column and a corbel beam, the corbel beam is fixed to one side of the concrete structure column, the front column is fixedly connected to the corbel beam, the rear column is fixed to the concrete structure column, the platform beam is fixed to the front column and the rear column, and the lifting platform also includes a horizontal structure, one end of the horizontal structure is fixed to the concrete structure column, and the other end is fixed to the platform beam.

[0027] Furthermore, an adjusting mechanism is installed on the lifting platform, and the adjusting mechanism is used to adjust the position of the lifting device. The adjusting mechanism includes a longitudinal adjusting mechanism and a transverse adjusting mechanism. The longitudinal adjusting mechanism is used to push the lifting device to move longitudinally into position, and the transverse adjusting mechanism is used to push the lifting device to move transversely and adjust.

[0028] Furthermore, the longitudinal adjustment mechanism includes a sliding track, a sliding platform and a pushing cylinder. The sliding track is installed on the platform beam. The sliding platform is slidably set on the sliding track. The pushing cylinder is set on the platform beam. The pushing cylinder is connected to the sliding platform. The sliding platform is pushed along the sliding track by the pushing cylinder. Limit blocks are provided at both ends of the sliding track, and the sliding platform is limited by the limit blocks.

[0029] Furthermore, the lateral adjustment mechanism includes a sliding track 2, a sliding platform 2 and a pushing cylinder 2. The sliding track 2 is arranged on the sliding platform 1. The sliding platform 2 is slidably arranged on the sliding track 2. The pushing cylinder 2 is installed on the sliding platform 2. The pushing cylinder 2 is connected to the sliding platform 2. The pushing cylinder 2 pushes the sliding platform 2 to move along the sliding track 2. Limit blocks 2 are provided at both ends of the sliding track 2. The limit blocks 2 are used to limit the sliding platform 2.

[0030] Furthermore, the guide frame includes a frame body, which is installed on the sliding platform 2. A reinforcing rib is provided at the bottom end of the frame body, and the reinforcing rib is used to increase the installation strength of the guide frame and the sliding platform 2. A crossbeam is provided at the top of the frame body, and vertical columns are provided at both ends of the crossbeam. The steel strand passes through the middle of the two vertical columns.

[0031] Furthermore, the lifting equipment adopts a hydraulic lifter, which is installed on sliding platform 2. Sliding platform 2 and sliding platform 1 are respectively provided with through slots, and the steel strands pass through the through slots and are connected to the hydraulic lifter. A temporary pressure plate is welded to sliding platform 2, and the temporary pressure plate includes a second welding surface and a third abutting portion. The temporary pressure plate is welded to sliding platform 2 through the second welding surface, and the third abutting portion is pressed against the hydraulic lifter.

[0032] The present invention has the following beneficial effects due to the adoption of the above technical solution:

[0033] 1. The overall lifting technology of the large-span grid structure is that the grid structure is mainly lifted as a whole after being assembled in situ on the ground, which can minimize the workload of high-altitude hoisting. At the same time, the hydraulic lifting operation time is short, which effectively guarantees the total construction period of the steel structure installation, and reduces the use of temporary facilities to a minimum, which is conducive to construction cost control.

[0034] 2. The overall lifting technology of the grid structure is mature, and the safety of the lifting process can be guaranteed. At the same time, the lifting equipment can be expanded and combined, and the lifting weight, span and area are not restricted. At the same time, reasonable load-bearing lifting points are designed, combined with flexible rigging load-bearing, to meet different lifting heights.

[0035] 3. The lifting equipment is small in size, light in weight and has a large carrying capacity. It is suitable for lifting large-tonnage components in narrow spaces or indoors. At the same time, the hydraulic lifter anchor has the self-locking property of reverse motion, which allows the components to be reliably locked at any position during the lifting process for a long time, realizing precise vertical positioning of the lifting unit in the air.

[0036] 4. The temporary hanging point is supported by an auxiliary support mechanism, which facilitates the setting of the temporary hanging point. At the same time, through the cooperation of the jacking cylinder and the telescopic rod, the auxiliary support mechanism can raise or lower the position of the temporary hanging point, and fine-tune the temporary hanging point so that each hanging point is at the same height to ensure the synchronous lifting effect.

[0037] 5. By providing an adjustment mechanism, the hydraulic lifter is installed on the adjustment mechanism. The adjustment mechanism can control the longitudinal and lateral movement of the hydraulic lifter and fine-tune the lifting point so that the lifting point and the temporary lifting point are at the same vertical height, which is convenient for lifting the lifting unit and ensures lifting stability and safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The present invention will be further described below in conjunction with the accompanying drawings:

[0039] Figure 1 It is a structural schematic diagram of a method for integrally lifting a large-span grid with structural seams according to the present invention;

[0040] Figure 2 It is a structural schematic diagram of the auxiliary support mechanism and the temporary hanging point in the present invention;

[0041] Figure 3 It is a structural schematic diagram of the auxiliary support mechanism in the present invention;

[0042] Figure 4 It is a structural schematic diagram of a temporary hanging point in the present invention;

[0043] Figure 5 It is a structural schematic diagram of the lifting platform and the adjusting mechanism in the present invention;

[0044] Figure 6 It is a structural schematic diagram of the adjustment mechanism in the present invention;

[0045] Figure 7 It is a structural schematic diagram of the lifting platform in the present invention;

[0046] Figure 8 For the present invention Figure 5 A partial enlarged view of the middle A;

[0047] Fig. 9 It is a structural schematic diagram of the guide frame in the present invention.

[0048] In the figure: 10 - lifting unit;

[0049] 20-lifting platform; 201-platform beam; 202-front column; 203-rear column; 204-corbel beam; 205-horizontal structure;

[0050] 30-adjusting mechanism; 301-sliding track 1; 302-sliding platform 1; 303-sliding track 2; 304-sliding platform 2; 305-limiting block 1; 306-limiting block 2; 307-pushing cylinder 1; 308-pushing cylinder 2; 309-through slot;

[0051] 40-hydraulic lifter; 401-temporary pressure plate; 402-second welding surface; 403-third abutting portion;

[0052] 50-guide frame; 501-frame; 502-crossbeam; 503-vertical column; 504-stiffening rib;

[0053] 60- auxiliary support mechanism; 601- lifting cylinder; 602- fixing rod; 603- telescopic rod; 604- support ring; 605- hollow slide; 606- fixing block 1; 607- fixing block 2; 608- long hole; 609- locking through hole; 610- locking bolt; 611- support bottom plate; 612- fixing bolt 1; 613- fixing foot; 614- fixing bolt 2; 615- support seat 1; 616- support shaft 1; 617- support seat 2; 618- support shaft 2;

[0054] 70-temporary hanging point; 701-temporary bottom plate; 702-temporary welding ball; 703-temporary casing; 704-temporary rod; 705-hollow channel; 706-reinforcement plate; 707-bottom anchor; 708-steel strand; 709-installation base; 710-temporary support plate; 711-first welding surface; 712-first abutting surface; 713-second abutting surface; 714-bottom anchor base; 80-concrete structural column. DETAILED DESCRIPTION

[0055] like Figures 1 to 9 As shown, a method for overall lifting of a large-span grid with structural joints according to the present invention comprises the following steps:

[0056] 1) Grid assembly: First, two lifting units 10 with structural joints are assembled on the floor with an elevation of 3.650m directly below the grid structure projection surface. The two lifting units 10 are lifted synchronously. Then, according to the position of the on-site concrete structure column 80, lifting points are symmetrically arranged on the lateral and longitudinal sides of the two lifting units 10. Two lifting points and six lifting points are arranged on the lateral and longitudinal sides, respectively. Therefore, a total of 16 lifting points are arranged in the present invention.

[0057] 2) Arrangement of lifting points: first, according to the set lifting point position, install the lifting platform 20 on the concrete structure column 80. The lifting platform 20 corresponds to the position of the lifting point. The lifting platform 20 is fixed on the concrete structure column 80. After the lifting platform 20 is installed, the adjustment mechanism 30 is installed on the lifting platform 20. The initial position of the adjustment mechanism 30 is located at one end of the lifting platform 20 close to the concrete structure column 80. After the adjustment mechanism 30 is installed, the lifting device is installed on the adjustment mechanism 30. After the lifting device is installed in place, the temporary pressing plate 401 is immediately used to clamp the lifting device to fix the lifting device. After the lifting device is installed, the guide frame 50 is installed at the rear of the lifting device, and then the lifting device and the guide frame 50 are moved to the position corresponding to the lifting point through the adjustment mechanism 30;

[0058] 3) Arrangement of temporary hanging point 70: First, according to the position of the lifting point of the lifting unit 10 and the position of the lifting point, the auxiliary support mechanism 60 is installed on the floor. After the auxiliary support mechanism 60 is installed, the temporary hanging point 70 is supported on the auxiliary support mechanism 60, and then the height of the temporary hanging point 70 is adjusted by lifting or lowering the auxiliary support mechanism 60. After the height of the temporary hanging point 70 is adjusted to correspond to the lifting unit 10, the temporary hanging point 70 is connected to the lifting unit 10 through the temporary rod 704 to complete the arrangement of the temporary hanging point 70;

[0059] 4) Connection between the lifting point and the temporary lifting point 70: After the lifting point and the temporary lifting point 70 are installed, the lifting point and the temporary lifting point 70 are connected through the bottom anchor 707 and the steel strand 708. The bottom anchor 707 is installed at the bottom end of the temporary lifting point 70. After the bottom anchor 707 is installed, it is immediately fixed with a temporary support plate 710. One end of the temporary support plate 710 is fixed to the bottom end of the temporary lifting point 70, and the other end is clamped with the bottom anchor 707. The steel strand 708 passes through the hollow part between the bottom anchor 707 and the temporary sling and extends upward. The lifting device is slidably fine-tuned through the adjustment mechanism 30, so that the steel strand 708 can pass through the through notch 309 of the adjustment mechanism 30, pass through the top of the lifting device, fall on the guide frame 50 behind the lifting device, and extend a certain length to facilitate the tensioning of the lifting device;

[0060] 5) Trial promotion stage

[0061] a. After the lifting point is connected to the temporary lifting point 70, check whether all devices are in normal operation and whether they meet the lifting requirements, ensure the connection between the lifting equipment and the power source, and start trial lifting after confirmation;

[0062] b. Load the lifting unit step by step in the order of 20%, 40%, 60%, 70%, 80%, 90%, 95% and 100% of the design load during lifting. During the step-by-step loading process, the lifting is suspended and the lifting point structure, temporary lifting point 70 structure and the deformation of the lifting unit 10 before and after loading are checked after each step of step-by-step loading is completed. After ensuring that the lifting unit 10 is stable, continue the next step of step-by-step loading until the lifting unit 10 is separated from the assembly frame;

[0063] 6) Stagnation stage: After the lifting unit 10 is lifted about 100 mm, the lifting is suspended and the lifting unit 10 is suspended in the air for 2 to 24 hours to conduct a comprehensive inspection of the hanging point structure, load-bearing system and lifting equipment, etc. After ensuring that all inspections are correct, prepare for formal lifting;

[0064] 7) Formal promotion

[0065] a. Fine-tune the elevation of each lifting point of the lifting unit 10 through the lifting equipment to make the lifting unit 10 in the designed posture, check whether there are any abnormalities in the lifting equipment, lifting points and temporary lifting points 70, and after confirming that there are no abnormalities, keep the lifting unit 10 in the designed posture and start the formal lifting;

[0066] b. When the lifting unit 10 is lifted to a distance of about 500-1000mm from the design elevation, the lifting is stopped, and the lifting points are fine-tuned to accurately lift the lifting unit 10 to the design elevation. The lifting equipment is stopped to keep the lifting unit 10 in the air, and then the rods are supplemented. When supplementing the rods, the rods are supplemented on both sides first, and then on the central position, so that the lifting unit 10 structure forms an overall stable force system;

[0067] c. The lifting equipment is unloaded in stages in the order of 95%, 90%, 80%, 70%, 60%, 50%, 40%, and 20% of the design load until the steel strands 708 are relaxed, so that the grid structure is transferred to the grid structure support;

[0068] 8) Removal of lifting points and temporary lifting points 70: After the lifting unit 10 is lifted into place, the lifting equipment, the adjustment mechanism 30, the lifting points, the temporary lifting points 70 and the auxiliary support mechanism 60 are removed to complete the overall lifting operation of the grid structure.

[0069] Through the above method steps, the present invention assembles the grid structure and then lifts it as a whole, which minimizes the workload of high-altitude hoisting, ensures the construction period, reduces the use of temporary facilities, and reduces construction costs. At the same time, the lifting equipment is small in size, light in weight, and has a large carrying capacity. It is suitable for lifting large-tonnage components in a narrow space or indoors. In the present invention, the lifting equipment is a hydraulic lifter 40, and the hydraulic lifter 40 adopts a core-through hydraulic lifter 40. The core-through hydraulic lifter 40 is a prior art. Please refer to the utility model patent named a core-through hydraulic lifter 40 (authorization announcement number: CN215855016U) for details, so it will not be elaborated in the present invention.

[0070] The hydraulic lifter 40 is small in size and weight, has strong maneuverability, is easy to transport and install, and is easy to use. By adopting the flexible rigging steel strand 708 to bear the load, the lifting height and lifting range are not limited under the condition of reasonable lifting points.

[0071] In step 3 and step 4, the temporary hanging point 70 includes a temporary base plate 701, a temporary welding ball 702, a temporary sleeve 703 and a temporary rod 704. The temporary sleeve 703 is installed on the temporary base plate 701. The temporary welding ball 702 is sleeved on the temporary sleeve 703. The temporary sleeve 703 is provided with a hollow channel 705. The hollow channel 705 is used for the steel strand 708 to pass through. One end of the temporary rod 704 is fixed to the temporary welding ball 702, and the other end of the temporary rod 704 is fixed to the lifting point of the lifting unit 10. The temporary hanging point 70 is also provided with a reinforcing plate 706. The reinforcing plate 706 is arranged on the temporary base plate 701 and the temporary sleeve 703. The reinforcing plate 706 is located between the temporary base plate 701 and the temporary welding ball 702.

[0072] The bottom anchor 707 is provided with a bottom anchor base 714, and the temporary bottom plate 701 is provided with a mounting base 709. The bottom anchor 707 is abutted against the mounting base 709 through the bottom anchor base 714. The temporary support plate 710 includes a first welding surface 711, a first abutting surface 712 and a second abutting surface 713. The temporary support plate 710 is welded to the temporary bottom plate 701 through the first welding surface 711. The first abutting surface 712 abuts against the mounting base 709, and the second abutting surface 713 abuts against the bottom anchor base 714. After the bottom anchor 707 is installed on the temporary lifting point 70, it is first fixed by the temporary support plate 710, and then the steel strand 708 passes through the bottom anchor 707 and passes through the hollow channel 705 to be connected with the hydraulic lifter 40, and then the lifting lifting point and the temporary lifting point 70 are connected.

[0073] In step 3, the auxiliary support mechanism 60 includes a support base plate 611, a lifting cylinder 601, a fixing rod 602, a telescopic rod 603 and a support ring 604. The support base plate 611 is provided with a fixing through hole 1. The support base plate 611 fixes the auxiliary support mechanism 60 through the fixing through hole 1 in combination with a fixing bolt 1 612 to ensure the stability of the auxiliary support mechanism 60. The fixing rod 602 is fixed to the support base plate 611. The fixing rod 602 is provided with a fixing foot 613. The fixing foot 613 is provided with a fixing through hole 2. The fixing rod 602 is fixed to the support base plate 611 through the fixing through hole 2 in combination with a fixing bolt 2 614. The bolt-fixed structure is more stable and has a better fixing effect. The fixing rod 602 is provided with a hollow slide groove 605. The telescopic rod 603 is slidably arranged in the hollow slide groove 605. The support base plate 611 is provided with a support seat 1 615. The support seat 1 615 is equipped with a support shaft 1 616. One end of the lifting cylinder 601 It is hinged with the support shaft 1 616, and a support seat 2 617 is provided on one side of the telescopic rod 603. The support seat 2 617 is installed with a support shaft 2 618. One end of the jacking cylinder 601 is hinged with the support shaft 2 618 to realize the connection between the jacking cylinder 601 and the telescopic rod 603. The telescopic rod 603 is controlled to slide along the hollow slide groove 605 by the jacking cylinder 601. A fixing block 1 606 is provided at the top of the telescopic rod 603, and a fixing block 2 607 is provided at the support ring 604. The support ring 604 is fixed to the telescopic rod 603 by the fixing block 1 606 and the fixing block 2 607 in combination with bolts. The temporary hanging point 70 is supported by the support ring 604. The second support ring 604 has an arc structure, which corresponds to the temporary welding ball 702, so as to facilitate the support of the temporary welding ball 702. In this embodiment, two auxiliary support mechanisms 60 are provided, and the temporary welding ball 702 is supported by the two support rings 604 to ensure the stability of the temporary hanging point 70.

[0074] The auxiliary support mechanism 60 also includes a locking structure. When the lifting cylinder 601 pushes the telescopic rod 603 to move, the fixed rod 602 and the telescopic rod 603 are locked through the locking structure to increase the operating stability and reduce the force borne by the lifting cylinder 601. The locking mechanism includes an elongated hole 608, a locking through hole 609 and a locking bolt 610. The elongated hole 608 is arranged on the fixed rod 602, and the locking through hole 609 is arranged on the telescopic rod 603. The locking bolt 610 passes through the locking through hole 609 and slides along the elongated hole 608. The locking bolt 610 is used to realize the locking of the fixed rod 602 and the telescopic rod 603. The structure is simple and easy to operate.

[0075] In the present invention, the temporary hanging point 70 is supported by the auxiliary supporting mechanism 60, which is convenient for setting the temporary hanging point 70. First, the temporary welding ball 702 is supported between the two supporting rings 604, and then the telescopic rod 603 is lifted by the lifting cylinder 601 to raise the temporary hanging point 70, which is convenient for the connection between the temporary hanging point 70 and the lifting unit 10. At the same time, by supporting the temporary welding ball 702, the temporary welding ball 702 is in a suspended state, which is convenient for the installation between the bottom anchor 707 and the temporary hanging point 70.

[0076] In step 2, the lifting platform 20 includes a platform beam 201, a front column 202, a rear column 203, a corbel beam 204 and a horizontal structure 205. The corbel beam 204 is fixed on one side of the concrete structure column 80, the front column 202 is fixedly connected to the corbel beam 204, the rear column 203 is fixed on the concrete structure column 80, the platform beam 201 is fixed on the front column 202 and the rear column 203, one end of the horizontal structure 205 is fixed on the concrete structure column 80, and the other end is fixed to the platform beam 201. The horizontal structure 205 is used to increase the load-bearing capacity of the lifting platform 20 to ensure safety. In this embodiment, two lifting platforms 20 of the above structure are provided, and the adjustment mechanism 30 is installed on the two lifting platforms 20.

[0077] The adjusting mechanism 30 is used to adjust the position of the lifting device. The adjusting mechanism 30 includes a longitudinal adjusting mechanism and a transverse adjusting mechanism. The longitudinal adjusting mechanism is used to push the lifting device to move longitudinally and move the lifting device to a position corresponding to the temporary hanging point. Then, the transverse adjusting mechanism is used to push the lifting device to move transversely and fine-tune the position of the lifting device so that the lifting device and the temporary hanging point are kept vertically arranged. In the present invention, the hydraulic lifter 40 is installed on the adjusting mechanism 30 and is moved to the other end of the platform beam 201 through the adjusting mechanism 30 so as to be arranged vertically with the temporary hanging point, which is convenient for the installer to install the hydraulic lifter 40 and move the hydraulic lifter 40 into place, thereby increasing the safety of the installer during installation.

[0078] The longitudinal adjustment mechanism includes a sliding track 301, a sliding platform 302 and a pushing cylinder 307. The sliding track 301 is installed on the platform beam 201. The sliding platform 302 is slidably set on the sliding track 301. The pushing cylinder 307 is set on the platform beam 201. The pushing cylinder 307 is connected to the sliding platform 302. The sliding platform 302 is pushed to slide along the sliding track 301 by the pushing cylinder 307. Limit blocks 305 are provided at both ends of the sliding track 301, and the sliding platform 302 is limited by the limit blocks 305.

[0079] The lateral adjustment mechanism includes a sliding track 303, a sliding platform 304 and a pushing cylinder 308. The sliding track 303 is set on the sliding platform 302. The sliding platform 304 is slidably set on the sliding track 303. The pushing cylinder 308 is installed on the sliding platform 304. The pushing cylinder 308 is connected to the sliding platform 304. The pushing cylinder 308 pushes the sliding platform 304 to move along the sliding track 303. Limit blocks 306 are provided at both ends of the sliding track 303. The limit blocks 306 are used to limit the sliding platform 304.

[0080] The hydraulic lifter 40 is installed on the sliding platform 304. The sliding platform 304 and the sliding platform 1 302 are provided with a through slot 309 correspondingly. The steel strand 708 passes through the through slot 309 and is connected to the hydraulic lifter 40. The sliding platform 304 is welded with a temporary pressure plate 401. After the hydraulic lifter 40 is installed on the sliding platform 304, the temporary pressure plate 401 is used to fix the hydraulic lifter 40. The temporary pressure plate 401 includes a second welding surface 402 and a third abutting portion 403. The temporary pressure plate 401 is welded to the sliding platform 304 through the second welding surface 402, and the third abutting portion 403 is pressed against the hydraulic lifter 40.

[0081] After the hydraulic lifter 40 in the present invention is installed on the sliding platform 304, the sliding platform 302 is pushed longitudinally by pushing the cylinder 307, and the sliding platform 302 is moved to the lifting point position corresponding to the temporary lifting point 70, and then the sliding platform 304 is pushed horizontally by pushing the cylinder 308, and the position of the hydraulic lifter 40 is fine-tuned so that the hydraulic lifter 40 and the temporary lifting point 70 are at the same vertical height, which facilitates the lifting of the lifting unit 10 and ensures the lifting stability and safety.

[0082] During the lifting or lowering process of the hydraulic lifter 40, sufficient steel strands 708 must be reserved at the top. If the reserved steel strands 708 are too long, it will have a great impact on the operation of the steel strands 708 and the hydraulic lifter 40 during the lifting and lowering process. Therefore, the steel strands 708 need to be guided by a guide frame 50. The guide frame 50 includes a frame body 501, which is installed on the sliding platform 304. A reinforcing rib is provided at the bottom end of the frame body 501. The reinforcing rib 504 is used to increase the installation strength between the guide frame 50 and the sliding platform 304. A crossbeam 502 is provided at the top of the frame body 501, and vertical columns 503 are provided at both ends of the crossbeam 502. The steel strand passes through the middle of the two vertical columns 503 and can slide freely.

[0083] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent replacements or modifications made based on the present invention to solve basically the same technical problems and achieve basically the same technical effects are all included in the protection scope of the present invention.

Claims

1. A method for overall lifting of a large-span grid with structural seams, characterized in that The following steps are involved: 1) Grid assembly: First, assemble two lifting units with structural joints on the floor directly below the grid structure projection surface. The two lifting units are lifted synchronously. Then, according to the position of the concrete structure column on site, the lifting points are symmetrically set on the horizontal and vertical sides of the two lifting units. 2) Arrangement of lifting points: First, install a lifting platform on the concrete structure column according to the set lifting point position. The lifting platform corresponds to the position of the lifting point and is fixed on the concrete structure column. After the lifting platform is installed, an adjustment mechanism is installed on the lifting platform. The initial position of the adjustment mechanism is located at one end of the lifting platform close to the concrete structure column. After the adjustment mechanism is installed, install the lifting equipment on the adjustment mechanism. After the lifting equipment is installed in place, immediately use a temporary pressure plate to clamp the lifting equipment and fix the lifting equipment. After the lifting equipment is installed, install a guide frame at the rear of the lifting equipment, and then move the lifting equipment and the guide frame to the position corresponding to the lifting point through the adjustment mechanism; 3) Arrangement of temporary hanging points: First, according to the position of the lifting point of the lifting unit and the position of the lifting point, an auxiliary support mechanism is installed on the floor. After the auxiliary support mechanism is installed, the temporary hanging point is supported on the auxiliary support mechanism, and then the height of the temporary hanging point is adjusted by lifting or lowering the auxiliary support mechanism. After the height of the temporary hanging point is adjusted to correspond to the lifting unit, the temporary hanging point is connected to the lifting unit through a temporary rod to complete the arrangement of the temporary hanging point; 4) Connection between the lifting point and the temporary lifting point: After the lifting point and the temporary lifting point are installed, the lifting point and the temporary lifting point are connected through the bottom anchor and the steel strand. The bottom anchor is installed at the bottom end of the temporary lifting point. After the bottom anchor is installed, it is immediately fixed with a temporary support plate. One end of the temporary support plate is fixed to the bottom end of the temporary lifting point, and the other end is clamped with the bottom anchor. The steel strand passes through the hollow part of the bottom anchor and the temporary sling and extends upward. The lifting equipment is slid and fine-tuned through the adjustment mechanism so that the steel strand can pass through the through-notch of the adjustment mechanism, pass through the top of the lifting equipment, fall on the guide frame behind the lifting equipment, and extend a certain length; 5) Trial promotion stage a. After the lifting point is connected to the temporary lifting point, check whether the overall lifting system is in normal operation and whether it meets the lifting requirements, ensure the connection between the lifting equipment and the power source, and start trial lifting after confirmation; b. Load the lifting unit step by step in the order of 20%, 40%, 60%, 70%, 80%, 90%, 95% and 100% of the design load during lifting. During the process of graded loading, the lifting is suspended after each step of graded loading is completed, and the deformation of the lifting point structure, temporary lifting point structure and lifting unit before and after loading is checked. After ensuring that the lifting unit is stable, continue with the next step of graded loading until the lifting unit is separated from the assembly frame; 6) Pause lifting: After the lifting unit is lifted about 100mm, stop lifting and keep the lifting unit in the air for 2 to 24 hours to conduct a comprehensive inspection of the hanging point structure, load-bearing system and lifting equipment. After ensuring that all inspections are correct, prepare for formal lifting; 7) Formal promotion a. Fine-tune the elevation of each lifting point of the lifting unit through the lifting equipment to make the lifting unit in the designed posture, check whether there are any abnormalities in the lifting equipment, lifting points and temporary lifting points, and after confirming that there are no abnormalities, keep the lifting unit in the designed posture and start the formal lifting; b. When the lifting unit is lifted to a distance of about 500-1000mm from the design elevation, stop lifting, fine-tune the lifting points to accurately lift the lifting unit to the design elevation, suspend the lifting equipment, keep the lifting unit in the air, and then make up the rods to make the lifting unit structure form an overall stable force system; c. The lifting equipment shall be unloaded in stages in the order of 95%, 90%, 80%, 70%, 60%, 50%, 40% and 20% of the design load until the steel strands become loose; 8) Removal of lifting points and temporary lifting points: After the lifting unit is lifted into place, the lifting equipment, adjustment mechanism, lifting points, temporary lifting points and auxiliary support mechanisms are removed to complete the overall lifting operation of the grid structure.

2. The method for overall lifting of a large-span grid with structural joints according to claim 1 is characterized in that: In step 3 and step 4, the temporary hanging point includes a temporary base plate, a temporary welding ball, a temporary sleeve and a temporary rod, the temporary sleeve is installed on the temporary base plate, the temporary welding ball is sleeved on the temporary sleeve, the temporary sleeve is provided with a hollow channel, the hollow channel is used for the steel strand to pass through, one end of the temporary rod is fixed to the temporary welding ball, and the other end of the temporary rod is fixed to the lifting unit, and the temporary hanging point is also provided with a reinforcement plate, the reinforcement plate is arranged on the temporary base plate and the temporary sleeve, and the reinforcement plate is located between the temporary base plate and the temporary welding ball; The bottom anchor is provided with a bottom anchor base, and the temporary bottom plate is provided with a mounting base. The bottom anchor is abutted against the mounting base via the bottom anchor base. The temporary support plate includes a first welding surface, a first abutting surface, and a second abutting surface. The temporary support plate is welded to the temporary bottom plate via the first welding surface. The first abutting surface presses against the mounting base, and the second abutting surface presses against the bottom anchor bottom plate.

3. The overall lifting construction method of a large-span grid with structural joints according to claim 1 is characterized by: In step 3, the auxiliary support mechanism includes a lifting cylinder, a fixed rod, a telescopic rod and a support ring, the fixed rod is provided with a hollow slide groove, the telescopic rod is slidably arranged in the hollow slide groove, the lifting cylinder is connected to the telescopic rod, the lifting cylinder controls the telescopic rod to slide along the hollow slide groove, the top of the telescopic rod is provided with a fixed block 1, the support ring is provided with a fixed block 2, and the support ring is fixed to the telescopic rod through the fixed block 1 and the fixed block 2; The auxiliary support mechanism also includes a locking structure, which is used to lock the fixed rod and the telescopic rod. The locking mechanism includes an elongated hole, a locking through hole and a locking bolt. The elongated hole is arranged on the fixed rod, and the locking through hole is arranged on the telescopic rod. The locking bolt passes through the locking through hole and slides along the elongated hole. The locking of the fixed rod and the telescopic rod is achieved by the locking bolt.

4. The overall lifting construction method of a large-span grid with structural joints according to claim 3 is characterized by: The auxiliary support mechanism also includes a support base plate, the support base plate is provided with a first fixing through hole, the support base plate is fixed by combining the first fixing through hole with a first fixing bolt, the fixing rod is provided with a fixing foot, the fixing foot is provided with a second fixing through hole, the fixing rod is fixed to the support base plate by combining the second fixing through hole with a second fixing bolt; The supporting base plate is provided with a supporting seat 1, the supporting seat 1 is installed with a supporting shaft 1, one end of the lifting cylinder is hinged to the supporting shaft 1, a supporting seat 2 is provided on one side of the telescopic rod, the supporting seat 2 is installed with a supporting shaft 2, and one end of the lifting cylinder is hinged to the supporting shaft 2.

5. The method for overall lifting of a large-span grid with structural joints according to claim 1 is characterized in that: The lifting platform described in step 2 includes a platform beam, a front column, a rear column and a corbel beam, the corbel beam is fixed to one side of the concrete structure column, the front column is fixedly connected to the corbel beam, the rear column is fixed to the concrete structure column, the platform beam is fixed to the front column and the rear column, and the lifting platform also includes a horizontal structure, one end of the horizontal structure is fixed to the concrete structure column, and the other end is fixed to the platform beam.

6. The method for integrally lifting a large-span grid with structural joints according to claim 5 is characterized in that: The adjusting mechanism is installed on the lifting platform, and is used to adjust the position of the lifting device. The adjusting mechanism includes a longitudinal adjusting mechanism and a transverse adjusting mechanism. The longitudinal adjusting mechanism is used to push the lifting device to move longitudinally into position, and the transverse adjusting mechanism is used to push the lifting device to move transversely for adjustment.

7. The method for integrally lifting a large-span grid with structural joints according to claim 6 is characterized in that: The longitudinal adjustment mechanism includes a sliding track, a sliding platform and a pushing cylinder. The sliding track is installed on the platform beam. The sliding platform is slidably set on the sliding track. The pushing cylinder is set on the platform beam. The pushing cylinder is connected to the sliding platform. The sliding platform is pushed to slide along the sliding track by the pushing cylinder. Limit blocks are provided at both ends of the sliding track, and the sliding platform is limited by the limit blocks.

8. The method for integrally lifting a large-span grid with structural joints according to claim 7 is characterized in that: The lateral adjustment mechanism includes a sliding track 2, a sliding platform 2 and a pushing cylinder 2. The sliding track 2 is arranged on the sliding platform 1. The sliding platform 2 is slidably arranged on the sliding track 2. The pushing cylinder 2 is installed on the sliding platform 2. The pushing cylinder 2 is connected to the sliding platform 2. The pushing cylinder 2 pushes the sliding platform 2 to move along the sliding track 2. Limit blocks 2 are provided at both ends of the sliding track 2. The limit blocks 2 are used to limit the sliding platform 2.

9. The method for integrally lifting a large-span grid with structural joints according to claim 8 is characterized in that: The guide frame includes a frame body, which is installed on the sliding platform 2. A reinforcing rib is provided at the bottom end of the frame body, and the reinforcing rib is used to increase the installation strength of the guide frame and the sliding platform 2. A crossbeam is provided at the top of the frame body, and vertical columns are provided at both ends of the crossbeam. The steel strand passes through the middle of the two vertical columns.

10. The method for integrally lifting a large-span grid with structural joints according to claim 8, characterized in that: The lifting device adopts a hydraulic lifter, and the hydraulic lifter is installed on the sliding platform 2. The sliding platform 2 and the sliding platform 1 are respectively provided with through slots, and the steel strands pass through the through slots and are connected to the hydraulic lifter. A temporary pressure plate is welded to the sliding platform 2, and the temporary pressure plate includes a second welding surface and a third abutting portion. The temporary pressure plate is welded to the sliding platform 2 through the second welding surface, and the third abutting portion is pressed against the hydraulic lifter.

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