Large steel structure truss lifting and sliding system

Abstract

The invention relates to the technical field of steel structure construction, and particularly discloses a large steel structure truss lifting and sliding system which comprises eight specific implementation processes, a steel structure lifting device and a steel structure sliding device are adopted, and through the core design of overall lifting of a steel structure truss and high-altitude sliding conversion of the steel structure truss, the large steel structure truss can be lifted. The problem of support mismatching in the prior art is solved. The method is mainly suitable for complex engineering scenes such as large-span steel structure venues and high-speed rail stations.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel structure construction, and particularly relates to a large steel structure truss lifting and sliding system. BACKGROUND

[0002] With the continuous development of the construction industry, large steel structures are increasingly widely used in various construction projects, such as large sports venues, industrial plants, high-speed rail stations, and other places. The use of large steel structures can effectively improve the space utilization and carrying capacity of buildings, meet the needs of large-span and high-space buildings, and provide solid technical support for the diversification of modern architecture. At the same time, steel structures have the characteristics of recyclability, which meets the development concept of green buildings and is of great significance for promoting the sustainable development of the construction industry.

[0003] In the installation process of large steel structures, lifting and sliding are key construction links. In particular, truss roof ceilings have the characteristics of large area and the need for multiple column supports. The support points of the columns on the truss roof ceiling need to fall on the staggered nodes of the longitudinal and transverse main beams to ensure the stability and carrying capacity of the overall structure. Traditional methods such as multi-machine lifting, mast lifting, roller sliding, and jack pushing have many limitations, such as site equipment limitations, low construction efficiency, high-altitude work, long-distance sliding costs, and other problems, making it difficult to meet the construction needs of one-time lifting of truss roof ceilings.

[0004] For the lifting and sliding technology of truss roof ceilings, the existing patent CN111927107B proposes a construction method of segmented hoisting and sliding splicing. The core of this method is segmented construction, which requires multiple high-altitude hoisting operations, and the truss assembly is completed on the high-altitude platform, and then the multi-row truss is linked and slid through the connecting rod. However, this method is suitable for large-span, multiple support columns, and densely arrayed large roof ceilings. The segmented sliding splicing scheme means long sliding distance, large track system, significantly prolonged construction period, increased cost, and difficulty in achieving the efficient goal of one-time lifting in place after overall assembly on the ground. In addition, the support point layout designed by this method is mainly two-sided and central support, which is convenient for setting up sliding rails and does not match the dense array node support mode required by this type of building.

[0005] Another patent CN118881026B sets a hemispherical support at the top of the column, and after the steel roof net rack is lifted into place, it needs to be fixed on the hemispherical support through the connecting piece. The hemispherical support is connected with the lower chord node of the net rack, and the position of the hemispherical support avoids the dense area of the rod. The docking is realized by using the "empty position" of the net rack grid. However, for large truss roof ceilings, the structural strength requirement of the support structure is high, and the support needs to be set at the intersection of the horizontal and vertical beams. Although this scheme can realize the one-time lifting of the steel roof net rack after ground assembly, reduce the later assembly, and improve the construction efficiency, the hemispherical support is set at the "empty position" of the net rack grid, which cannot meet the support demand of the truss roof ceiling.

[0006] Therefore, there is an urgent need for a large steel structure truss lifting and sliding system to solve the problem of large truss roof ceiling area and dense column support condition, realize one-time lifting into place after ground assembly, and ensure that the support point falls at the intersection node of the vertical and horizontal beams, so as to overcome the problems of low efficiency, high cost and mismatch of existing technology. SUMMARY

[0007] In view of the deficiencies of the prior art, the technical problem solved by the present application is to provide a large steel structure truss lifting and sliding system to solve the problem of mismatch of the prior art.

[0008] In order to solve the above problems, the technical scheme adopted by the present application is: a large steel structure truss lifting and sliding system, comprising eight specific implementation processes, Process 1: truss misplacement assembly is carried out on the elevated floor, the concrete column is in the space formed by the horizontal and vertical beams, the base set at the intersection of the horizontal and vertical beams is adjacent to the corresponding concrete column, and the line connecting the center of the concrete column with the center of the base is at an angle of 45 degrees with the horizontal and vertical beams; the column top steel structure lifting device is installed synchronously; Process 2: after the installation of the steel structure lifting device is completed, the truss is lifted 0.2m away from the elevated floor by the lifting device, and is observed for 10 hours; Process 3: the truss is continuously lifted; Process 4: the truss is lifted beyond the design elevation of the roof and is suspended in the air; Process 5: the lower steel structure sliding device of the truss is installed; Process 6: the steel structure lifting device is started to place the base set at the intersection of the horizontal and vertical beams of the truss on the sliding shoe of the steel structure sliding device; Process 7: the column top steel structure lifting device is removed, the column top support is installed, and the truss is pushed and slid by the steel structure sliding device; Process 8: after the truss is pushed and slid into place, the truss is welded with the column top support, and the steel structure sliding device is removed.

[0009] Compared with the prior art, the beneficial effects of the scheme are: 1. The whole staggered assembly of the elevated floor is completed, the segmented hoisting is saved, and the hoisting is simultaneously lifted to the position, the amount of high-altitude operation is reduced, and the construction period is shortened; 2. In the prior art, the sliding rail is directly installed on the top of the concrete column, and after the steel structure is slid to the position, the steel structure is lifted to remove the rail, and in the technical scheme, the staggered assembly design is adopted, the center line of the base of the concrete column and the horizontal and vertical beams is 45 degrees with the horizontal and vertical beams, the sliding rail is installed outside the concrete column, and the load is unloaded outside the concrete column, so that the deviation and construction period loss caused by the installation and removal of the rail on the top of the column are avoided.

[0010] Further, when the truss is lifted according to the process two, the trial lifting step is tested in stages of 20%, 40%, 60%, 80%, 90% and 100%, the height difference and the sag data are monitored by the total station after each loading and are recorded, and the single-point dynamic lifting is adopted when the steel structure is lifted off the ground to ensure that the steel structure is lifted off the ground synchronously.

[0011] Further, when the truss is placed on the sliding rail according to the process six, the step of graded unloading is in the order of 20%, 40%, 60%, 80% and 100% of the graded unloading, until the load of the truss is completely transferred to the sliding rail.

[0012] Further, the steel structure lifting device comprises an upper lifting point device and a lower lifting point device; the upper lifting point device comprises a lifting support fixedly installed on the column top floor of the concrete column; the lifting support comprises symmetrically fixed lifting devices on the horizontal beam, two vertical columns are symmetrically fixed below the horizontal beam, and the lower ends of the vertical columns are fixed on the column top floor; the net distance between the symmetrically fixed lifting devices is greater than the diameter of the concrete column, and the lifting devices and the steel strand are connected through an anchor clamp; the lifting device is used for pulling the steel strand to move the steel strand upward; the lower lifting point device comprises a lower lifting device used for lifting the structure to be lifted, the structure to be lifted and the lower lifting device are connected through a corbel, and a reinforcing rod is used for reinforcing the lower lifting device and the structure to be lifted.

[0013] Further, the steel structure sliding device comprises a supporting structure and a pushing device; the supporting structure is used for supporting the pushing device; the pushing device comprises a sliding beam, a sliding rail, a pusher and a sliding shoe; the sliding beam has an isosceles trapezoidal cross-sectional outline, and the wider bottom is at the upper part; the sliding rail is fixedly installed on the upper part of the sliding beam; one end of the pusher is fixed on the sliding rail, and the other end is fixed through an ear plate and an extended connecting structure welded on the steel structure; the connecting structure is welded and fixed on the gravity center horizontal plane of the steel structure; the extension direction of the connecting structure is 45 degrees with the steel structure longitudinal and horizontal truss; the sliding shoe is located between the sliding beam and the steel structure, and is used for reducing the frictional resistance between the steel structure and the sliding rail. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 This is a schematic diagram of the staggered assembly of the trusses of the present invention.

[0015] Figure 2 Schematic diagram of the truss lifting process of the present invention.

[0016] Figure 3 This is a schematic diagram of the truss of the present invention being lifted beyond the roof.

[0017] Figure 4 Schematic diagram of the truss sliding process of the present invention.

[0018] Figure 5 This is a schematic diagram of the truss of the present invention after installation is completed.

[0019] Figure 6 It is a structural schematic diagram of the lifting device of the present invention.

[0020] Figure 7 It is a structural schematic diagram of the sliding device of the present invention.

[0021] Figure 8 This is a schematic diagram of the coordination process between the lifting device and the sliding device of the present invention.

[0022] Figure 9 Schematic diagram of the use process of the lifting device and sliding device of the present invention The reference numerals in the drawings of the specification include: elevated floor 1; Lifting device 2; lifting bracket 21; lifter 211; crossbeam 212; column 213; lower sling 22; steel strand 23; Sliding device 3; sliding beam 31; sliding rail 32; pusher 33; sliding shoe 34; ear plate 35; connecting structure 36; Truss 4. DETAILED DESCRIPTION

[0023] The following is further described in detail through specific implementation methods: Example 1 like Figures 1 to 5 As shown, a large steel structure truss lifting and sliding system includes eight specific implementation processes, as follows: Process 1: Staggered assembly of trusses 4 is performed on the elevated floor 1. The concrete columns are located in the space formed by the horizontal and vertical beams. The bases arranged at the intersection of the horizontal and vertical beams are adjacent to the corresponding concrete columns. The line connecting the center of the concrete column and the center of the base is at 45 degrees to the horizontal and vertical beams. The column top steel structure lifting device 2 is installed simultaneously.

[0024] Process 2: After the steel structure lifting device 2 is completed, the truss 4 is lifted 0.2m away from the elevated floor and left to stand for observation for 10 hours.

[0025] Process 3: Continuous lifting of truss 4.

[0026] Process 4: Truss 4 is lifted above the design elevation of the roof and hung in the air.

[0027] Process 5: Install the lower steel structure sliding device 3 of the truss 4.

[0028] Process 6: Start the steel structure lifting device 2 and place the base set at the staggered position of the horizontal and longitudinal beams of the truss 4 on the sliding shoe 34 of the steel structure sliding device 3.

[0029] Process seven: Remove the column top steel structure lifting device 2, install the column top support, and use the steel structure sliding device 3 to push and slide the truss 4.

[0030] Process 8: After the truss 4 is pushed and slid into place, the truss 4 is welded to the column top support and the steel structure sliding device 3 is removed.

[0031] Among them, processes 2 to 6 belong to the lifting stage, and processes 7 to 8 belong to the sliding stage. The lifting stage and the sliding stage are carried out in sequence. Through phased operation, it is possible to use appropriate devices and methods to carry out construction according to the characteristics of the large steel structure truss 4 in different installation stages, thereby ensuring the safety and efficiency of the construction process and avoiding the problems of poor synchronization and low installation efficiency in traditional methods.

[0032] Specifically, the lifting stage includes five steps: pre-lifting preparation and inspection, trial lifting, formal lifting, lifting into position and staged unloading.

[0033] In the preparation and inspection steps before lifting, the lifter, guide frame, steel strand, ground anchor, pipeline valve block and sensor are inspected, and preloading and temporary facility inspection are also carried out. In terms of the lifter, under the condition that the lower anchor is fastened, the upper anchor is loosened, the pump station is started, the pressure is adjusted to about 3 MPa, the main oil cylinder of the telescopic lifter is stretched and contracted, the oil pipe connection of the A cavity and the B cavity is checked, whether the stop valve can stop the corresponding oil cylinder is checked, the frequency converter is adjusted, and whether the speed of the telescopic cylinder of the corresponding lifter can be accelerated or slowed down when the current changes is checked. The replaceable equipment of the lifter can be other similar hydraulic lifting devices, but it is required to ensure that the rated lifting capacity and working stability meet the engineering requirements. The guide frame is required to be firmly installed with the lifter and to smoothly guide the steel strand, and the installation position and guiding direction of the guide frame are required to be based on the principle of facilitating the installation of the oil pipe and the sensor and not affecting the free falling of the steel strand, and the replaceable guide structure can be a frame structure with similar guiding function. The uppermost horizontal rod of the guide frame is about 1.5-2 meters away from the top anchor (about 3.5 meters in total height), and it is appropriate to deviate from the lifter by 0.4 meters, so as to ensure that the steel strand is vertically guided and smoothly moves along the guide frame. As the bearing system, the steel strand is required to be carefully inspected by a dedicated person before lifting, and there should be no loose strands, bending, misplacement and external welding scars. The ground anchor is required to ensure that the lifting appliance is installed correctly and that the anchor plate can lock the steel strand. Due to transportation reasons, the joints of individual valves or hard pipes on the pump station may be loose, which are required to be checked one by one and tightened, and at the same time, it is required to check whether the pressure adjusting spring of the overflow valve is completely in a relaxed state; it is required to check whether the cable and control line connection between the pump station, the synchronous control system and the hydraulic lifter is correct; it is required to check whether the oil pipe connection between the pump station and the main oil cylinder of the hydraulic lifter and the anchor cylinder is correct; the system is powered on, and the direction of rotation of the main shaft of the hydraulic pump is checked. In the case that the pump station is not started, the corresponding buttons in the synchronous control system main controller are manually operated, the action of each electromagnetic valve and stop valve is checked, and whether each stop valve corresponds to each lifter number is checked. The sensors include travel sensors, anchor cylinder sensors and displacement sensors, and the travel switches of the 2L, 2L-, L+, L of each oil cylinder travel sensor and the SM, XM of the anchor cylinder are pressed to make the corresponding signal lights in the main controller send signals. When preloading, the pressure is adjusted to 3 MPa, so that each steel strand in each lifter is basically in the same tension state. In terms of temporary facilities, the installation and firmness of the upper and lower lifting points and other facilities are checked, the reinforcement of the lifting component is checked, and the removal of obstacles during the formal lifting of the structure is checked. These inspection and preparation work is to ensure the safety and smooth progress of the subsequent lifting process, and any problem in any link may lead to serious consequences.

[0034] During the trial lift, loads are tested in stages of 20%, 40%, 60%, 80%, 90%, and 100%. After each load period, the structural condition of the relevant load points is checked. A total station is used to track and monitor the height difference and deflection of the steel trusses 4, allowing for leveling after liftoff. All monitoring data during the loading process is fully recorded. When the steel structure is about to leave the elevated floor 1, it may not leave the ground at the same time at each point. At this point, the lifting speed should be reduced, and the liftoff of each point should be closely monitored. If necessary, a "single-point lift" should be performed to ensure that the structure is lifted smoothly and in sync with each other. After the staged loading is completed, the structure is hoisted approximately 200 mm above the elevated floor 1 and then paused for 10 hours for a comprehensive inspection. At the end of this period, each specialized team will summarize the inspection results. After the lifting command center verifies that there are no hidden dangers or problems, the general commander will issue the official lift order. Trial lifts can identify potential problems in advance, allowing adjustments to any non-compliant areas to ensure the safety of the official lift.

[0035] During the formal lifting process, as truss 4 is continuously lifted, the uniformity of the load on each lifting point, the overall stability of the upper lifting point platform, the overall stability of the steel structure lifting process, and the synchronization of computer control of each lifting point must be monitored in real time. The lifting load-bearing system is a key component, and special attention should be paid to checking the anchorage, anchor plates, and screws, the smooth passage of the steel strands from the top of the lifter, and any leaks in the main cylinder and the upper and lower anchor cylinders, as well as any other abnormalities. The hydraulic power system must also be monitored, including changes in system pressure, oil line leaks, oil temperature changes, temperature changes in the oil pump, motor, and solenoid valve coil, and system noise. This comprehensive monitoring and inspection can promptly identify and address any problems that arise during the lifting process, ensuring safe and stable lifting.

[0036] During the lifting-into-place step, the steel structure trusses 4 are simultaneously lifted to a height 0.5m above their design elevation, then paused to allow space for the subsequent installation of the steel structure sliding devices 3 beneath them. Fine adjustments are then made to each lifting point to ensure the structure reaches the designed position. The lifting equipment is then paused and locked to maintain a stable aerial position. Finally, the steel structure sliding devices 3 beneath them are installed. These fine adjustments ensure the installation accuracy of the steel structure, ensuring it meets design requirements.

[0037] During the staged unloading step, the steel structure lifting device 2 is activated, and the truss 4 is slowly lowered onto the sliding track of the steel structure sliding device 3. The unloading process is carried out in a staged manner of 20%, 40%, 60%, 80%, and 100% until the load of the truss 4 is completely transferred to the sliding track and the structural stress of the steel structure sliding device 3 is restored to the design working condition. Staged unloading prevents damage to the structure caused by sudden stress changes and ensures a safe transition. Simultaneously, the synchronous control system monitors the hydraulic lock pressure changes in real time until the steel strands are no longer stressed.

[0038] In the lifting stage, the hydraulic lifting system is mainly composed of hydraulic lifters, pump source system, steel strands, sensing detection and computer synchronous control system. The hydraulic lifter is of a through-core structure, and the flexible steel strand is used as the lifting rigging. Different models of hydraulic lifters have different rated lifting capacities, such as TJJ-600, TJJ-1100, TJJ-2000, TJJ-3500, TJJ-5000, TJJ-8000, etc. Different models of hydraulic lifters can be arbitrarily expanded and combined to meet different engineering needs. In this project, TJJ-2000 and TJJ-1100 hydraulic lifters are selected, with rated lifting capacities of 200t and 110t respectively. The number of hydraulic pump source systems is selected according to the number of hydraulic lifters. A total of 4 TJV-60 hydraulic pump source systems are configured during lifting, with each pump source controlling 4 hydraulic lifters. The hydraulic pump source system provides hydraulic power for the hydraulic lifter and completes the corresponding action under the control of various hydraulic valves. In different engineering applications, the demand and model of the lifter are not the same. In order to improve the versatility and reliability of the hydraulic lifting equipment, the design of the hydraulic pump source system adopts a modular structure. Specifically, according to the number and model of the lifter, the number of pump source systems is configured, multiple modules can be combined, each module takes a set of pump source system as the core, and can independently control a group of hydraulic lifters, while multiple lifting points can be expanded to meet the needs of actual lifting engineering. In this project, a hydraulic pump source system with a rated power of 60KW is selected. According to the arrangement position of the lifter and the pump source system, a YT-6 type computer synchronous control and sensing detection system is selected to be configured at the steel corridor structure position. The steel strand uses high-strength low-relaxation prestressed steel strand. According to the structure weight of the steel structure truss and the configuration of the hydraulic lifter, the TJJ-2000 / 1100 type hydraulic lifter selects steel strand with a diameter of 15.2mm and a breaking force of 26t per root.

[0039] Hydraulic lifting process: "tighten the anchor, clamp the steel strand → lifter lifts the weight → tighten the anchor, clamp the steel strand → main oil cylinder micro-shrink, anchor piece is released → anchor cylinder rises, anchor is fully released → main oil cylinder retracts to the original position". When the hydraulic lifter repeats the action, the lifted weight moves step by step. In order to ensure the safety of the structure during lifting, according to the arrangement of the lifting points, the synchronous lifting and staged unloading control strategy of "lifting point oil pressure balance, structure posture adjustment, displacement synchronous control, staged unloading and positioning" is adopted. The control system realizes the lifting posture control and load control of the steel structure according to the above control strategy and specific algorithm. In the lifting process, from the perspective of ensuring the safety of the structure during lifting, the following requirements should be met: ensure that each lifting point of the same motor in the pump station is evenly loaded; ensure the stability of the lifting structure in the air, that is, each lifting point should be able to maintain a certain synchronization during lifting.

[0040] Arrangement of Computer Synchronous Control System: This project is equipped with a YT-6 computer synchronous control system. This system is small and lightweight (same size as a computer). To facilitate control operation and construction, the synchronous control system can be arranged close to the hoist, pump source system, etc. for easy connection. The surrounding area must be well protected from rain and ensure a quiet environment.

[0041] The installation operation process of the steel strand in the lifting stage is as follows: 1. Use a grinding wheel cutter or gas cutting to cut the steel strand into the specified length, and use a grinder or gas cutting to repair the two ends of the steel strand to make it flat, smooth, and not loose; 2. Install the guide plate directly under the lifter, adjust the position of the guide plate hole so that it is aligned with the anchor holes of the lifter, and temporarily fix it; 3. Use a catheter to check the sky anchor, upper anchor, middle partition, lower anchor, safety anchor and guide plate holes of the lifter from top to bottom, so that all 36 holes correspond; 4. Mark the guide plate, usually the inner circle hole pointing to the outside along the layout direction of the lifter is the 1# hole; 5. Each steel strand of the lifter is inserted in a left-hand and right-hand interval; 6. Start the catheter from the 1# hole above the sky anchor, pass through 6 layers from top to bottom, and ensure that the position is correct; then insert the guide needle into the catheter, screw the "bullet head" on the guide needle thread under the guide plate, and plug the steel strand to be inserted into the "sub The steel strand is used as the main driving force to pass through each layer in turn. The remaining steel strand at the top of the hoist is locked to the sky anchor with a temporary anchor plate. 7. After each two steel strands are passed through, use a clamp to clamp the steel strands in pairs to prevent them from slipping from the air. 8. Generally, a small part of the outer ring is passed through first, then the entire inner ring, and then the remaining outer ring is passed through, rotating left and right at intervals. 9. After all the steel strands are passed through, use the upper and lower anchor cylinders to lock the steel strands and lock them. Sky anchor; 10. Use a soft rope to lower the drainage board to the upper part of the lower hanging point, adjust the orientation of the drainage board, and pay attention to the direction of the 1# marked hole; 11. After the steel strands are inserted, if the bottom ends are uneven, draw a horizontal line on all the steel strands in the appropriate position, cut off the steel strands below the line, and repair the ends of the steel strands to make them smooth; 12. Adjust the position of the ground anchor hole to align it with the hole in the drainage board, insert the steel strands into the ground anchor in sequence, align them, and lock the steel strands.

[0042] As attached Figure 6As shown: the large steel structure lifting device 2 in the application, including the upper lifting point device and the lower lifting point device; the upper lifting point device includes a lifting support 21, which is fixedly installed on the column top floor of the concrete column; the lifting support 21 includes a lifting device 211 symmetrically fixed on a cross beam 212, two vertical columns 213 symmetrically fixed below the cross beam 212, and the lower ends of the vertical columns 213 fixed on the column top floor; the net distance between the symmetrically fixed lifting devices 211 is greater than the diameter of the concrete column, and the lifting device 211 is connected with the steel strand 23 through an anchor clamp; the lifting device 211 is used to pull the steel strand 23 to move the steel strand 23 upward; the lower lifting point device includes a lower lifting device 22 for lifting the structure to be lifted, the structure to be lifted and the lower lifting device 22 are connected through a corbel, and a reinforcing rod is used to reinforce the lower lifting device 22 and the structure to be lifted.

[0043] After the grading unloading step is completed, the column top steel structure lifting device 2 is removed, the column top support is installed, and the steel structure sliding device 3 is used to synchronously slide the truss 4.

[0044] The sliding stage includes four steps of clamping of the pusher clamping device and the sliding rail, sliding of the hydraulic cylinder pushing member, loosening of the clamping device and dragging, and repeated pushing, until the member reaches the final position.

[0045] In the clamping step of the pusher clamping device and the sliding rail, it is ensured that the clamping device can firmly clamp the sliding rail to provide reliable counterforce for subsequent pushing. The TJG-1000 type hydraulic pusher used here has good clamping performance.

[0046] In the hydraulic cylinder pushing member sliding step, the hydraulic cylinder of the pusher is extended, and the sliding member is pushed forward. One TJG-1000 type hydraulic pusher is arranged on each sliding rail, and four 60kW hydraulic pump stations are configured. The arrangement principle of the hydraulic pump station is to be as close as possible to the hydraulic pusher, and each pump station drives four pushers. Each pump station has a rated power of 60kW, and each pump source needs to be equipped with a 200A power distribution box and a 25 square millimeter five-core copper core cable. The hydraulic synchronous sliding construction technology adopts computer control, and through data feedback and control instruction transmission, certain synchronous action, load balancing, posture correction, stress control, operation locking, process display and fault alarm and other functions can be automatically realized.

[0047] In the cylinder retraction loosening clamping device and dragging step, the hydraulic cylinder of the pusher is retracted, the wedge in the clamping device is loosened from the sliding rail, and the clamping device is dragged forward. In this way, preparation for the next pushing process can be made.

[0048] In the repeated pushing process, after one pushing process is completed, the above steps are executed again until the component reaches the final position. This cyclic operation can realize long-distance sliding of the component, and the computer synchronous control system can ensure the synchronous action and load balance of each pusher.

[0049] When the truss 4 is slid into position, each point and column top support is welded, and all lifting and sliding measures are finally removed.

[0050] Attached Figure 7 As shown: the large steel structure sliding device 3 in the application, including support structure and pushing device; the support structure is used for supporting the pushing device, the pushing device includes sliding beam 31, sliding rail 32, pusher 33, sliding shoe 34; the cross section of the sliding beam 31 is isosceles trapezoidal, the wider bottom is on the upper part; the sliding rail 32 is fixedly installed on the upper part of the sliding beam 31; the pusher 33 is fixed at one end on the sliding rail 32, and is fixed at the other end through the lug plate 35 and the extended connecting structure 36 welded on the steel structure; the connecting structure 36 is welded and fixed on the barycentric horizontal plane of the steel structure; the angle between the extension direction of the connecting structure 36 and the longitudinal and transverse truss 4 of the steel structure is 45 degrees; the sliding shoe 34 is located between the sliding beam 31 and the steel structure, and is used for reducing the frictional resistance between the steel structure and the sliding rail 32.

[0051] The implementation principle of the embodiment is: the large steel structure truss 4 lifting and sliding system adopts the phased construction method, and through detailed preparation, trial lifting, monitoring and other steps in the lifting stage, the safety and synchronism of the lifting process are ensured, and the problems of uneven stress and poor synchronism of the steel structure are avoided; in the sliding stage, the hydraulic pusher and the computer synchronous control system are used to realize the accurate sliding and load balance of the component. Through reasonable step arrangement and accurate control, the whole system improves the construction efficiency, reduces the construction cost, ensures the quality and safety of the large steel structure installation, and has significant improvement compared with the traditional method and the prior art.

[0052] The above is only an embodiment of the application, and the specific structure and characteristics of the scheme are not described in detail. It should be pointed out that for those skilled in the art, without departing from the structure of the application, a number of modifications and improvements can be made, which should be regarded as the protection scope of the application, and these will not affect the effect and practicality of the application. The protection scope claimed in the application should be subject to the content of its claims, and the specific implementation mode and the like in the description can be used to explain the content of the claims.

Claims

1. A large steel structure truss lifting and sliding system, characterized in that: It includes eight specific implementation processes: Process 1: The trusses are assembled in a staggered manner on the elevated floor. The concrete columns are located in the space formed by the horizontal and vertical beams. The bases set at the intersection of the horizontal and vertical beams are adjacent to the corresponding concrete columns. The line connecting the center of the concrete column and the center of the base is at a 45-degree angle to the horizontal and vertical beams. The steel structure lifting device on the top of the column is installed simultaneously. Process 2: After the steel structure lifting device is installed, the truss is lifted 0.2m away from the elevated floor by the lifting device and left to stand for observation for 10 hours; Process 3: Continuous lifting of trusses; Process 4: The truss is lifted beyond the design elevation of the roof and hung in the air; Process 5: Install the sliding device of the lower steel structure of the truss; Process 6: Start the steel structure lifting device and place the bases set at the staggered positions of the truss horizontal and longitudinal beams onto the sliding shoes of the steel structure sliding device; Process 7: Remove the column top steel structure lifting device, install the column top support, and use the steel structure sliding device to push and slide the truss; Process 8: After the truss is pushed and slid into place, weld the truss to the column top support and remove the steel structure sliding device.

2. A large steel structure truss lifting and sliding system according to claim 1, characterized in that: When the truss is lifted as described in process 2, the trial lifting steps are tested according to the graded loading of 20%, 40%, 60%, 80%, 90% and 100%. After each loading, the height difference and deflection data are monitored and recorded by the total station. When the steel structure is loaded off the ground, a single-point dynamic lifting is used to ensure synchronous lifting.

3. The large steel structure truss lifting and sliding system according to claim 1, characterized in that: When placing the truss on the sliding track as described in process 6, the graded unloading steps are carried out in the order of 20%, 40%, 60%, 80%, and 100% until the truss load is completely transferred to the sliding track.

4. The large steel structure truss lifting and sliding system according to claim 1, characterized in that: The steel structure lifting device includes an upper hanging point device and a lower hanging point device; the upper hanging point device includes a lifting bracket, which is fixedly installed on the top base plate of the concrete column; the lifting bracket includes a lifter symmetrically fixed on the crossbeam, two columns are symmetrically fixed under the crossbeam, and the lower ends of the columns are fixed on the top base plate of the column; the net spacing between the symmetrically fixed lifters is greater than the diameter of the concrete column, and the lifter is connected to the steel strand by an anchor clamp; the lifter is used to pull the steel strand to move the steel strand upward; the lower hanging point device includes a lower sling for lifting the lifted structure, the lifted structure and the lower sling are connected by a corbel, and a reinforcing rod for reinforcing the lower sling and the lifted structure.

5. The large steel structure truss lifting and sliding system according to claim 1, characterized in that: The steel structure sliding device includes a supporting structure and a pushing device; the supporting structure is used to support the pushing device, and the pushing device includes a sliding beam, a sliding track, a pusher, and a sliding shoe; the outer contour of the cross section of the sliding beam is an isosceles trapezoid, with the wider bottom side at the upper part; the sliding track is fixedly installed on the upper part of the sliding beam; one end of the pusher is fixed to the sliding track, and the other end is fixed to the connecting structure welded and extended on the steel structure through an ear plate; the connecting structure is welded and fixed to the horizontal plane of the center of gravity of the steel structure; the extension direction of the connecting structure makes an angle of 45 degrees with the longitudinal and transverse trusses of the steel structure; the sliding shoe is located between the sliding beam and the steel structure, and is used to reduce the friction resistance between the steel structure and the sliding track.

Images