Construction method of mountain-shaped portal rigid frame structure under multi-level height limiting condition

Abstract

The invention discloses a construction method of an E-shaped portal rigid frame structure under the condition of multi-level height limitation, the E-shaped portal rigid frame structure is hoisted and constructed under the condition of multi-level height limitation, and the multi-level height limitation comprises eight levels of heights from an area A to an area H. Construction planning is conducted, specifically, the E-shaped portal rigid frame structure is vertically divided into three vertical areas including an area I, an area II and an area III, and each vertical area is transversely divided into five transverse areas; step 2, filling a karst cave: filling a cave body by using sleeve valve pipe grouting according to filling requirements; 3, pipe pile construction is conducted, specifically, pile driving is conducted in place in the construction area through a pile machine; 4, foundation construction is conducted, specifically, foundation construction is completed in the construction area; and 5, steel structure construction is conducted, specifically, construction of five transverse areas is sequentially conducted in the three vertical areas at the same time. According to the construction method, smooth construction of the portal rigid frame structure within the limited hoisting height is ensured, and the requirements for safety, quality and construction period efficiency are met.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction, and particularly relates to a construction method for a chevron-shaped portal frame structure under multi-level height limit conditions. Background Art

[0002] The main structural form of a certain project is a chevron-shaped portal frame structure. It is located in the Guanghua alluvial basin with many karst caves, northwest of the airport terminal building. The east side is the airport runway, the south and north sides are villages, and the west side is a mountain range. Therefore, the construction of the chevron-shaped portal frame structure involves the hoisting of steel columns, portal frame beams, column braces, tie rods, water braces, and purlins under limited height conditions.

[0003] As the main load-bearing member of the portal frame structure, the quality of the installation of steel columns directly affects the installation quality of the overall steel structure project and plays a crucial role. At present, how to achieve fast, efficient, and high-quality installation of steel columns has become a hot issue of concern and research for engineering technicians.

[0004] Large-span portal frame beams are mostly assembled by butt joint on the ground. During the butt joint assembly process of portal frame beams, the use of assembly devices is essential. However, at present, there are some problems in the actual application of the assembly devices for rigid frame beams and their installation methods. For example, the butt joint efficiency is low, the assembly accuracy is difficult to guarantee, and the quality of high-strength bolt joints is not easy to control. These problems lead to easy shaking, poor stability, inability to achieve precise adjustable butt joint during the assembly of portal frame beams, and the need to set a large number of temporary supports, resulting in a high assembly cost and being not conducive to large-scale use in engineering.

[0005] In the hoisting operation of purlins, they are hoisted one by one separately and in high-altitude operations. Since the number of purlins is often large, each hoisting requires repeated binding and confirmation of the slings, and hoisting can only be carried out after ensuring safety and reliability. Moreover, it wastes the operation time of the hoisting machinery, and safety accidents may occur if construction workers are slightly careless. The existing hoisting methods for H-shaped purlins are not conducive to large-scale popularization and use.

[0006] In the steel structure hoisting project with limited hoisting height, engineering technicians often do not pay enough attention and have not effectively solved the hoisting operation problems under strict height limit conditions. The hoisting safety factor is relatively low, and the hoisting accuracy and efficiency often cannot be fully guaranteed, making the construction process face many challenges. Especially within the flight area boundary of the airport, due to extremely strict height limit requirements, it is necessary to ensure that the lifting height of the hoisting machinery is strictly controlled within the specified limit height to ensure the smooth construction of the portal frame structure within the limited hoisting height and meet the requirements of safety, quality, and construction period efficiency. Summary of the Invention

[0007] The object of the present invention is to provide a construction method for a chevron-shaped portal frame structure under multi-level limited height conditions. This construction method solves the problems of assembly and hoisting encountered by the chevron-shaped portal frame structure during construction under limited height conditions.

[0008] To achieve the above object, the present invention adopts the following technical solutions: A construction method for a chevron-shaped portal frame structure under multi-level limited height conditions. The chevron-shaped portal frame structure is located in the Guanghua alluvial basin with many karst caves and is hoisted and constructed under multi-level limited height conditions. The multi-level limited height includes eight levels of height from Area A to Area H. The construction includes the following steps: Step 1, construction planning: Vertically divide the chevron-shaped portal frame structure into three vertical areas, namely Area I, Area II, and Area III. Each vertical area is horizontally divided into five horizontal areas, and the construction of the five horizontal areas is carried out in sequence in the three vertical areas simultaneously; Step 2, karst cave filling: Determine the fully filled soil karst cave area, semi-filled soil karst cave area, and unfilled soil karst cave area within the construction area according to the design requirements, and then use sleeve valve pipe grouting to fill the cave body according to the filling requirements; Step 3, pipe pile construction: Carry out surveying and setting out work in the construction area, establish a survey control network, select elevation base points as the basis for elevation control during construction, position the pile driver for pile driving. After the pipe pile is driven to the designed elevation, cut the pile section exposed above the ground, and then carry out pile top plugging; Step 4, foundation construction: Complete the foundation construction in the construction area, and multiple cup-shaped foundations are set on the foundation; Step 5, steel structure construction: The construction of the five horizontal areas is carried out in sequence in the three vertical areas simultaneously. In each horizontal area, in sequence: S0, assist the steel column hoisting to the cup-shaped foundation by the column body reinforcement and adjustment device; S1, assist the portal frame beam for ground assembly by the assembly device; S2, hoist the portal frame beam by the limited hoisting height hoisting device; S3, hoist the column brace, tie rod, and water brace by the limited hoisting height hoisting device; S4, hoist the purlin by the limited hoisting height hoisting device and cooperate with the purlin hoisting fixture.

[0009] Preferably, the column body reinforcement and adjustment device includes a frame, an upper clamping assembly, and a lower adjustment assembly. The frame is detachably installed on the cup-shaped foundation. At least four groups of the upper clamping assemblies are adjustable on the top of the frame, and at least four groups of the lower adjustment assemblies are adjustable on the bottom of the frame. After at least four groups of the lower adjustment assemblies adjust and align the steel column, it is temporarily clamped and fixed by at least four groups of the upper clamping assemblies; the frame is a hexahedron frame structure composed of eight cross beams and four legs. The hexahedron frame structure is fixedly arranged on the cup-shaped foundation. One group of the upper clamping assemblies is arranged on each of the four cross beams on the upper layer of the frame, and one group of the lower adjustment assemblies is arranged on each of the four cross beams on the lower layer of the frame.

[0010] The upper clamping assembly includes a screw rod and a nut seat. The nut seat is detachably installed at the long circular hole of the cross beam through the screw rod. The screw rod is threadedly connected inside the nut seat, and the top end of the screw rod abuts against the side wall of the bottom flange of the steel column. The lower adjusting assembly is a hand-operated flat jack. A top plate is arranged at the top end of the hand-operated flat jack, and the top plate abuts against the side wall of the bottom flange of the steel column. An L-shaped hook is fixedly arranged at the bottom of the hand-operated flat jack. When the top end of the hand-operated flat jack abuts against the side wall of the bottom of the cup-shaped column, the L-shaped hook is horizontally hooked on the cross beam.

[0011] Preferably, the S0 is specifically: A0. The inner wall of the installation position of the cup-shaped foundation must be roughened and cleaned first, and all sundries in the cup-shaped opening must be thoroughly removed. The longitudinal and transverse positioning cross lines for the installation of the steel column are drawn on the cup-shaped foundation through measuring instruments, and the bottom elevation of the cup-shaped foundation is measured to ensure the accurate elevation during the installation of the steel column. A1. Place the column body reinforcement and adjustment device on the cup-shaped foundation, loosen the four screw rods, and reserve the space for the steel column to be inserted into the installation position. A2. Lift the steel column to the installation position by a truck crane, slowly place it in place manually, press the bottom surfaces of the four hand-operated flat jacks tightly against the steel column. The L-shaped hooks of the hand-operated flat jacks are in mutual contact and tight with the cross beam of the lower layer of the frame. By turning the handles of each hand-operated flat jack, adjust the coordinate position of the steel column so that the longitudinal and transverse positioning cross lines are aligned with the center line of the steel column. A3. After the coordinate position adjustment is completed, tighten the four screw rods and press them against the side wall of the steel column flange. Prepare two theodolites and place them in two directions, the north side and the east side of the steel column, to measure the center line of the steel column. If the longitudinal center line is aligned, the steel column is vertical; if not, the steel column needs to be adjusted. Adjust the verticality of the steel column by adjusting the screw thread length of the screw rod until the center lines of the steel column in both directions are aligned with the center lines of the theodolites. A4. After the plane position, verticality, and elevation all meet the requirements, check whether all the fixing parts are firm. After confirmation, release the lifting ropes of the truck crane, that is, the installation of the steel column is completed. A5. Pour concrete inside the cup-shaped foundation. Before the concrete reaches the final setting state, the column body reinforcement and adjustment device can be removed.

[0012] Preferably, the assembling device includes at least two assembling jigs and at least two sets of clamping components. The at least two assembling jigs are placed side by side, and adjacent assembling jigs are connected by connecting rods. A rigid frame unit beam is placed on each assembling jig, and the rigid frame unit beams are temporarily fixedly connected by two sets of clamping components and assembled into a portal rigid frame beam by screwing bolts; the assembling jig includes a support and two sets of columns. The two sets of columns are oppositely arranged on both sides of the support. Each set of columns includes two legs, and a space is provided between the two legs for clamping and positioning the rigid frame unit beam; a roller is rotatably arranged horizontally at the bottom between the two legs, and a roller is installed on the roller; the support includes two cross beams and two longitudinal beams. The two longitudinal beams are arranged relatively parallel and connected by two cross beams; the clamping component includes a first clamping plate and a second clamping plate. The first clamping plate and the second clamping plate have the same shape and size. The long round holes at the top of the first clamping plate and the long round holes at the top of the second clamping plate are adjustably connected by bolts; round holes are opened in the middle of the first clamping plate and the second clamping plate, and a perforating cone is arranged through the round holes opened on the rigid frame unit beam; notches are arranged at the bottom of the first clamping plate and the bottom of the second clamping plate and are clamped at the upper flange or the lower flange of the rigid frame unit beam; a set of pressing components is arranged in the middle of one side of the first clamping plate and the middle of one side of the second clamping plate. The pressing component includes a fixed block, a nut and a tightening bolt. The fixed block is fixedly arranged above the notch. A through hole is arranged in the middle of the fixed block. A nut is arranged at the through hole on the fixed block, and a tightening bolt is threadedly connected in the nut. When the clamping component is clamped and connected between two adjacent rigid frame unit beams, the bottom end of the tightening bolt abuts against the upper flange and the lower flange of the rigid frame unit beam.

[0013] Preferably, the S1 is specifically as follows: B0. On the flat ground, pre-assemble the assembling jigs in advance; B1. Use a truck crane to lift two sections of the rigid frame unit beam to be assembled onto the assembling jig, and slide the rigid frame unit beam on the assembling jig for preliminary positioning and docking; B2. Install the clamping components at the upper flange and the lower flange at the docking position of the rigid frame unit beam. At the same time, temporarily fix the first clamping plate and the second clamping plate to the rigid frame unit beam respectively through the perforating cone, and screw the tightening bolts to further tighten the clamping components; B3. Connect with high-strength bolts at the docking position of the rigid frame unit beam, and the screwing sequence of the bolts is from the middle to both ends; B4. Remove the clamping components to complete the docking and assembly of the portal rigid frame beam.

[0014] Preferably, the limited lifting height lifting device includes a steel wire rope, a lifting cross beam, and a plurality of fixture bodies. A plurality of fixture bodies are sleeved on the lifting cross beam at intervals. The two ends of the steel wire rope hooked on the sling of the truck crane are connected to the tops of two of the plurality of fixture bodies. The bottoms of the plurality of fixture bodies are used to connect to the lifting lugs of the portal rigid frame beam or the purlin lifting fixture; an installation hole adapted to the outer shape of the lifting cross beam is provided on the fixture body. Lifting parts are provided at both ends of the top and bottom of the fixture body. A plurality of fastening components are symmetrically arranged on the front and rear sides of the fixture body. The plurality of fastening components fix the fixture body on the lifting cross beam; a lifting hole is provided on the lifting part. The lifting hole at the top is connected to the end of the steel wire rope. The lifting hole at the bottom is connected to the lifting lug of the portal rigid frame beam or the purlin lifting fixture through a connecting rope; the fastening component includes a base fixedly arranged on the fixture body and an adjusting bolt adjustably installed on the base by threads. A locking nut is provided on the adjusting bolt; four of the fastening components are provided on both the front side and the rear side of the fixture body. Two fastening components are located on the left or right side of the installation hole and are used to abut against the web of the lifting cross beam. The other two fastening components are located on the upper and lower sides of the installation hole and are used to abut against the upper and lower flange plates of the lifting cross beam.

[0015] Preferably, the lifting steps of the limited lifting height lifting device are as follows: C0. Place the lifting cross beam on a flat ground. The operator sleeves the fixture bodies onto the lifting cross beam from both ends of the lifting cross beam and moves them to the lifting point position. C1. Tighten the adjusting bolts on both sides of the fixture body and press them tightly against the upper and lower flanges and the web of the lifting cross beam to prevent the fixture body from sliding during the lifting process. C2. The truck crane hoists the hook, installs the steel wire rope on the hook, and connects the steel wire rope to the lifting holes at the upper parts of two of the fixture bodies through shackles. C3. The portal rigid frame beam or the purlin is in place. Prepare to connect the connecting rope to the lower lifting hole of the fixture body. The lower end of the connecting rope is then connected to the lifting lug of the portal rigid frame beam or the purlin lifting fixture through a shackle. All shackles need to be tightened. The purlin lifting fixture is used to clamp the purlin. C4. After the above preparations are completed, the truck crane hoists and lifts the portal rigid frame beam or the purlin to the installation position. The construction personnel can carry out the installation. After the installation is completed, disconnect the connecting rope from the lifting lug of the portal rigid frame beam or the purlin lifting fixture.

[0016] Preferably, the purlin hoisting fixture includes two detachably connected fixture monomers. Each fixture monomer consists of a C-shaped steel plate body, an upper connection part arranged at the top of the C-shaped steel plate body, and a lower connection part arranged at the bottom of the C-shaped steel plate body. An upper slot hole is arranged between the upper connection part and the C-shaped steel plate body, and a lower slot hole is arranged between the lower connection part and the C-shaped steel plate body. A hoisting hole is arranged on the upper connection part, and a connection hole is arranged on the lower connection part. The two hoisting holes are connected by a shackle, and the two connection holes are connected by a connecting piece. The two fixture monomers are respectively installed on both sides of the purlin. The gap, the upper slot hole, and the lower slot hole between the two C-shaped steel plate bodies form a mounting hole adapted to the shape of the purlin. The upper connection part, the lower connection part, and the C-shaped steel plate body are integrally formed. The connecting piece is a bolt, and the two fixture monomers are detachably connected by using the bolt to pass through the two connection holes.

[0017] In the present invention, for the hoisting construction of the gable portal frame structure under the condition of multi-level limit height, the multi-level limit height includes eight level heights from Area A to Area H. In the traditional method, multiple truck cranes of different specifications need to be used in cooperation. However, in this project, the steel structures are dense. The method of combining a truck crane and a hoisting device with a limited hoisting height is adopted for the hoisting construction of the steel structures. The control height of the truck crane is 24.9 m.

[0018] The upper clamping assembly is used to adjust the horizontal position of the steel column. The upper clamping assembly is arranged on the cross beam to adjust the verticality of the steel column. The double reinforcement measures of the upper clamping assembly and the upper clamping assembly ensure that the steel column does not overturn during the installation process, improve the stability of the steel column, and can provide convenient conditions for the hoisting of the gable portal frame beam. There is no need to set steel wedges around the steel column, which can stably reinforce the steel column, reduce the labor input, shorten the construction period, and has great potential for large-scale promotion and application in the field of steel structure engineering. It is also convenient for pouring concrete in the cup foundation, improves the installation accuracy of the steel column, reduces the occurrence of safety accidents during the hoisting process of the steel column, and prepares for the subsequent hoisting of the gable portal frame beam. After the installation construction of the steel column is completed, the 4 groups of bolts connecting the upper and lower cross beams on one side are unscrewed, and the frame is disassembled from the cup foundation for easy turnover and reuse, which conforms to the concept of sustainable development and green construction. The column body reinforcement and adjustment device can quickly install the steel column, and the adjustment process is more convenient. Since it requires fewer personnel, it is outstanding in cost saving, greatly improves the installation efficiency and construction quality of the steel column, has a simple structure, is convenient for processing and manufacturing, and the required steel materials are all commonly used materials in the processing factory. The process of installation and disassembly is simple and fast.

[0019] The girder unit of the rigid frame is placed on the assembly jig. The roller and roller shaft structure set on the assembly jig can easily and quickly adjust the lateral position of the rigid frame girder to complete the preliminary docking. The rigid frame unit girders placed on the assembly jig are temporarily fixedly connected through the clamping components. After all the bolt holes in the middle position of the rigid frame unit girders are successfully docked, the high-strength bolt connection pairs at this part are first installed, and the initial tightening and final tightening are completed gradually from the middle to both sides. Then, the clamping components on the upper and lower sides are removed, and the high-strength bolt connection pairs of the remaining bolt holes are installed and the initial tightening and final tightening are completed, that is, the assembly of the gabled rigid frame girder is completed. The assembly device has a simple structure and convenient processing. Common steel materials in the steel structure processing factory are used as the main materials. These steel materials are not only easy to obtain, but also can be recycled and reused after use, which helps to promote the concepts of sustainable development and green manufacturing. The use of the perforated cone and the bolt can replace the drift pins and installation bolts of the traditional assembly device, eliminating the need to insert the installation bolts, saving work efficiency, and eliminating the misalignment problem after the docking and assembly of the gabled rigid frame girder, providing strong technical support for the entire assembly process.

[0020] In the hoisting device with limited hoisting height, the fixture body of the fixture is sleeved on the hoisting cross beam through the installation holes provided thereon. During use, different numbers of fixtures are selected for installation according to the span of the gabled rigid frame girder or purlin to improve the stability during hoisting. The provided fastening components can quickly fix the fixture body, facilitating installation and disassembly, and can be reused repeatedly, improving the hoisting efficiency. By changing the connection position of the steel wire rope, such as when encountering a construction project with limited height requirements, the steel wire rope is connected to the two fixture bodies at the outermost ends of multiple fixture bodies, or by moving the fixture body outwards, the distance between the lifting point of the truck crane and the hoisting cross beam can be shortened according to the needs, greatly reducing the lifting height of the truck crane and avoiding the occurrence of ultra-high situations, ensuring the safety and controllability of the airport flight area. When in a construction area with more stringent height restrictions, the lifting point can be quickly changed by adjusting the position of the fixture body of the hoisting fixture, greatly reducing the lifting height of the truck crane and ensuring that the clearance conditions of the flight area are fully maintained.

[0021] In the purlin hoisting fixture, the two fixture monomers provided can be fixed at any position on the purlin according to the hoisting requirements. The connection is simple and convenient, and can completely wrap and fix the web and flange of the purlin, with good connection reliability, avoiding the phenomenon of the lifting point sliding during hoisting and having a high safety factor. The upper and lower ends of the two fixture monomers are connected through shackles and connecting pieces, facilitating disassembly and assembly, and the shackles can be directly connected to the lifting appliance. Brief Description of the Drawings

[0022] Figure 1 It is a schematic diagram of the gabled rigid frame structure of the present invention; Figure 2 It is a multi-level height limit division diagram of the present invention; Figure 3Schematic diagram of the column body reinforcement and adjustment device of the present invention; Figure 4 Partial schematic diagram of the column body reinforcement and adjustment device of the present invention; Figure 5 Schematic diagram of the assembly device of the present invention; Figure 6 Partial schematic diagram of the assembly device of the present invention; Figure 7 Schematic diagram of the hoisting device with limited hoisting height of the present invention; Figure 8 Partial schematic diagram of the hoisting device with limited hoisting height of the present invention; Figure 9 Hoisting schematic diagram of the hoisting device with limited hoisting height of the present invention; Figure 10 Schematic diagram of the purlin hoisting fixture of the present invention; Figure 11 Schematic diagram of the single fixture body of the present invention; In the figure: 1, steel column; 2, cup foundation; 3, column body reinforcement and adjustment device; 4, portal frame beam; 5, assembly device; 6, hoisting device with limited hoisting height; 8, purlin hoisting fixture; 30, frame; 31, upper clamping assembly; 32, lower adjustment assembly; 40, rigid frame unit beam; 50, assembly jig; 51, clamping assembly; 52, connecting rod; 53, perforating cone; 54, pressing assembly; 55, notch; 60, steel wire rope; 61, hoisting cross beam; 62, fixture main body; 63, hoisting part; 64, connecting rope; 65, fastening assembly; 80, single fixture; 81, C-shaped steel plate main body; 82, upper connecting part; 83, lower connecting part; 84, upper slot hole; 85, lower slot hole; 86, hoisting hole; 87, connecting hole; 88, connecting piece; 300, cross beam; 301, column; 310, screw; 311, nut seat; 500, support; 501, support column; 502, roller; 510, first clamping plate; 511, second clamping plate; 540, fixed block; 541, nut; 542, top bolt; 620, mounting hole; 650, support; 651, adjusting bolt; 652, locking nut. Detailed implementation manners

[0023] The following further describes the present invention with reference to the accompanying drawings: As Figures 1 to 11A construction method for a chevron-shaped portal frame structure under multi-level height limit conditions is shown. The chevron-shaped portal frame structure is a steel structure project in a certain freight area. The main structure system is a portal frame, a single-layer structure, with a building height of 18.9 m, a maximum span of 24 m, and a total steel consumption of 10,300 t for the steel structure. The main specifications of the portal frame beam components in this project are: H1100 - 700×300×8×16, H1100 - 800×300×8×16, H1050 - 800×300×8×16, H700×300×8×14. Because this project is adjacent to the airport and is within the airport height limit area, and in some areas under the 36 m height limit requirement, a 25 t truck crane needs to be used for hoisting construction. The lifting control height of the truck crane is within 24.9 m to ensure the construction of the portal frame beam in the high rack area. Located in the Guanghua alluvial basin with many karst caves and under multi-level height limit conditions for hoisting construction, the multi-level height limit includes eight levels of height from Area A to Area H. The construction includes the following steps: Step 1, construction planning: Vertically divide the chevron-shaped portal frame structure into three vertical areas, namely Area I, Area II, and Area III. Each vertical area is horizontally divided into five horizontal areas, and the three vertical areas carry out sequential construction of the five horizontal areas simultaneously; Step 2, karst cave filling: Determine the fully filled soil karst cave area, semi-filled soil karst cave area, and unfilled soil karst cave area within the construction area according to the design requirements, and then use sleeve valve pipe grouting for cavity filling according to the filling requirements; Step 3, pipe pile construction: Carry out surveying and setting out work within the construction area, establish a survey control network, select elevation benchmark points as the basis for elevation control during construction, position the pile driver for pile driving. After the pipe pile is driven to the required depth, cut off the pile section exposed above the ground, and then carry out pile top plugging; Step 4, foundation construction: Complete the foundation construction within the construction area. There are multiple cup-shaped foundations 2 on the foundation; According to the design drawings, the depth of the business center foundation pit is 8.5 m, with 2 sets of anchor cables and steel waist beams inside, with a spacing of 1.8 m, and the anchor cable lengths are 20.5 / 19 m. On the west side of the foundation pit are plain concrete piles for composite foundation construction, with a pile diameter of 500 and a pile spacing of 1.5 m, and the construction pile length is 8.5 m. When constructing the anchor cables, there is a situation where the anchor cables hit the plain concrete piles, damaging the pile bodies, and some plain concrete piles are located within the slope range of the foundation pit, and the pile bodies may be damaged during excavation. Review the relevant drawings, adjust the anchor cable spacing according to the positioning and pile spacing of the plain concrete piles, give priority to constructing the plain concrete pile area, and then carry out the construction of the foundation pit anchor cables; Step 5, Steel structure construction: Construction of five transverse areas is carried out simultaneously and sequentially in three vertical areas. In each transverse area, the following operations are carried out in sequence: S0, with the assistance of the column body reinforcement and adjustment device 3, the steel column 1 is hoisted to the cup foundation 2; S1, with the assistance of the assembly device 5, the portal frame beam 4 is assembled on the ground; S2, the portal frame beam 4 is hoisted by the limited hoisting height hoisting device 6; S3, the column brace, tie rod and water brace are hoisted by the limited hoisting height hoisting device 6; S4, the purlin is hoisted by the limited hoisting height hoisting device 6 in cooperation with the purlin hoisting fixture 8.

[0024] The column body reinforcement and adjustment device 3 includes a frame 30, an upper clamping assembly 31 and a lower adjustment assembly 32. The frame 30 is detachably installed on the cup foundation 2. At least four groups of upper clamping assemblies 31 are adjustably arranged at the top of the frame 30, and at least four groups of lower adjustment assemblies 32 are adjustably arranged at the bottom of the frame 30. After at least four groups of lower adjustment assemblies 32 adjust and align the steel column 1, it is temporarily clamped and fixed by at least four groups of upper clamping assemblies 31. The frame 30 is a hexahedron frame structure composed of eight cross beams 300 and four legs 301. The hexahedron frame structure is fixedly arranged on the cup foundation 2. A group of upper clamping assemblies 31 are arranged on each of the four cross beams 300 on the upper layer of the frame 30, and a group of lower adjustment assemblies 32 are arranged on each of the four cross beams 300 on the lower layer of the frame 30. The upper clamping assembly 31 includes a screw 310 and a nut seat 311. The nut seat 311 is detachably installed at the long circular hole of the cross beam 300 through the screw. The screw 310 is threadedly connected in the nut seat 311, and the top end of the screw 310 abuts against the side wall of the bottom flange of the steel column 1. The lower adjustment assembly 32 is a hand-operated flat jack. A top plate is arranged at the top end of the hand-operated flat jack, and the top plate abuts against the side wall of the bottom flange of the steel column 1. An L-shaped hook is fixedly arranged at the bottom of the hand-operated flat jack. When the top end of the hand-operated flat jack abuts against the side wall of the bottom of the cup column 1, the L-shaped hook is horizontally hooked on the cross beam 300.

[0025] One or more cross beams 300 on the lower layer of the frame 30 are movable cross beams and are connected to adjacent cross beams 300 through bolts. One or more cross beams 300 on the upper layer of the frame 30 are also movable cross beams and are connected to adjacent cross beams 300 through bolts. The legs 301 are welded to the cross beams 300.

[0026] S0 is specifically as follows: A0, the inner wall of the installation position of the cup foundation 2 must be roughened and cleaned first, and the sundries in the cup must be thoroughly removed. The longitudinal and transverse positioning cross lines for installing the steel column 1 are drawn on the cup foundation 2 through measuring instruments, and the bottom elevation of the cup foundation 2 is measured to ensure the accurate elevation during the installation of the steel column 1; A1, place the column body reinforcement and adjustment device 3 on the cup foundation 2, loosen the four screws 310, and reserve the insertion of the steel column 1 into the installation position; A2. Lift the steel column 1 to the installation position by a truck crane, slowly place it in position manually, press the bottom surfaces of the four hand-operated flat jacks against the steel column 1, and make the L-shaped hook hangers of the hand-operated flat jacks abut against and closely fit with the cross beams 300 at the lower layer of the frame 30. Adjust the coordinate position of the steel column 1 by turning the handles of each hand-operated flat jack so that the vertical and horizontal positioning cross lines are aligned with the center line of the steel column 1; A3. After the coordinate position adjustment is completed, tighten the four screws and press them against the flange side wall of the steel column 1. Prepare two theodolites and place them in two directions, namely the north side and the east side of the steel column 1, to measure the center line of the steel column 1. If the vertical center line is aligned, the steel column 1 is vertical; if not, the steel column 1 needs to be adjusted. Adjust the verticality of the steel column 1 by adjusting the screw thread length until the center lines of the steel column 1 in both directions are aligned with the center lines of the theodolites; A4. After the plane position, verticality and elevation all meet the requirements, check whether each fixing part is firm. After confirming that there is no error, release the hoisting ropes of the truck crane, that is, the installation of the steel column 1 is completed; A5. Pour concrete inside the cup foundation 2. Before the concrete reaches the final setting state, the column body reinforcement adjustment device 3 can be removed.

[0027] The assembling device 5 includes at least two assembling jigs 50 and at least two sets of clamping components 51. At least two assembling jigs 50 are placed side by side, and adjacent two assembling jigs 50 are connected by a connecting rod 52. A rigid frame unit beam 40 is placed on each assembling jig 50. The rigid frame unit beams 40 are temporarily fixedly connected by two sets of clamping components 51 and assembled into a portal rigid frame beam 4 by screwing bolts; The assembling jig 50 includes a support 500 and two sets of columns 501. The two sets of columns 501 are oppositely arranged on both sides of the support 500. Each set of columns 501 includes two legs, and a space is arranged between the two legs for clamping and positioning the rigid frame unit beam 40; A roller 502 is rotatably arranged horizontally at the bottom between the two legs, and a roller 13 is installed on the roller 502; The support 500 includes two cross beams and two longitudinal beams. The two longitudinal beams are arranged relatively parallel and connected by two cross beams; The clamping component 51 includes a first clamping plate 510 and a second clamping plate 511. The first clamping plate 510 and the second clamping plate 511 have the same shape and size. The long round holes at the top of the first clamping plate 510 and the long round holes at the top of the second clamping plate 511 are adjustably connected by bolts; Round holes are opened in the middle of the first clamping plate 510 and the second clamping plate 511, and a perforating cone 53 is arranged through the round holes opened on the rigid frame unit beam 40; Notches 55 are arranged at the bottom of the first clamping plate 510 and the bottom of the second clamping plate 511 and are clamped at the upper flange or the lower flange of the rigid frame unit beam 40; A set of pressing components 54 are arranged in the middle of one side of the first clamping plate 510 and the middle of one side of the second clamping plate 511. The pressing component 54 includes a fixing block 540, a nut 541 and a tightening bolt 542. The fixing block 540 is fixedly arranged above the notch 55. A through hole is arranged in the middle of the fixing block 540. A nut 541 is arranged at the through hole of the fixing block 540, and a tightening bolt 542 is threadedly connected in the nut 541. When the clamping component 51 is clamped and connected between two adjacent rigid frame unit beams 40, the bottom end of the tightening bolt 542 abuts against the upper flange and the lower flange of the rigid frame unit beam 40.

[0028] S1 is specifically: B0. On the flat ground, assemble the assembling jig 50 in advance; B1. Use a truck crane to lift two sections of the rigid frame unit beam 40 to be assembled onto the assembling jig 50, and slide the rigid frame unit beam 40 on the assembling jig 50 for preliminary positioning and butt joint; B2. Install the clamping component 51 at the upper flange and the lower flange at the butt joint of the rigid frame unit beam 40. At the same time, temporarily fix the first clamping plate 510 and the second clamping plate 511 to the rigid frame unit beam 40 respectively through the perforating cone 53, and screw the tightening bolt 542 to further tighten the clamping component 51; B3. Connect by high-strength bolts at the butt joint of the rigid frame unit beam 40. The screwing sequence of the high-strength bolts is from the middle to both ends; B4. Remove the clamping assembly 51 to complete the butt joint assembly of the portal frame beam 4.

[0029] The lifting device 6 with limited lifting height includes a steel wire rope 60, a lifting cross beam 61 and a plurality of fixture bodies 62. A plurality of fixture bodies 62 are sleeved on the lifting cross beam 61 at intervals. The two ends of the steel wire rope 60 hung on the sling of the truck crane are connected to the tops of two of the plurality of fixture bodies 62. The bottoms of the plurality of fixture bodies 62 are used for hanging and connecting with the lifting lugs of the portal frame beam 4 or the purlin lifting fixture 8; An installation hole 620 adapted to the outer shape of the lifting cross beam 61 is provided on the fixture body 62. Lifting parts 63 are provided at both the top and bottom ends of the fixture body 62. A plurality of fastening assemblies 65 are symmetrically arranged on the front and rear side faces of the fixture body 62. The plurality of fastening assemblies 65 fix the fixture body 62 on the lifting cross beam 61; A lifting hole is provided on the lifting part 63. The lifting hole at the top is connected to the end of the steel wire rope 60. The lifting hole at the bottom is connected to the lifting lug of the portal frame beam 4 or the purlin lifting fixture 8 through a connecting rope 64; The fastening assembly 65 includes a base 650 fixedly arranged on the fixture body 62 and an adjusting bolt 651 adjustably installed on the base 650 by threads. A locking nut 652 is arranged on the adjusting bolt 651; Four fastening assemblies 65 are arranged on both the front side and the rear side of the fixture body 62. Two fastening assemblies 65 are located on the left or right side of the installation hole 620 and are used to abut against the web of the lifting cross beam 61, and the other two fastening assemblies 65 are located on the upper and lower sides of the installation hole 620 and are used to abut against the upper and lower flange plates of the lifting cross beam 61.

[0030] The lifting steps of the lifting device 6 with limited lifting height are as follows: C0. Place the lifting cross beam 61 on a flat ground. The operator sleeved the fixture bodies 62 onto the lifting cross beam 61 from both ends of the lifting cross beam 61 and moved them to the lifting point position. C1. Tighten the adjusting bolts 651 on both sides of the fixture body 62 and tighten them against the upper and lower flanges and the web of the lifting cross beam 61 to prevent the fixture body 62 from sliding during the lifting process. C2. The truck crane hoists the hook. The hook installs the steel wire rope 60 and connects the steel wire rope 60 to the lifting holes at the upper parts of two of the fixture bodies 62 through shackles. C3. The portal frame beam 4 or the purlin is in place. Prepare to connect the connecting rope 64 to the lower lifting hole of the fixture body 62. The lower end of the connecting rope 64 is then connected to the lifting lug of the portal frame beam 4 or the purlin lifting fixture 8 through a shackle. All shackles need to be tightened. The purlin lifting fixture 8 is used to clamp the purlin. C4. After the above preparations are completed, the truck crane hoists and lifts the portal frame beam 4 or the purlin to the installation position. The construction personnel can carry out the installation. After the installation is completed, disconnect the connecting rope 64 from the lifting lug of the portal frame beam 4 or the purlin lifting fixture 8.

[0031] The purlin hoisting fixture 8 includes two detachable fixture units 80. The fixture unit 80 is composed of a C-shaped steel plate body 81, an upper connecting part 82 arranged at the top of the C-shaped steel plate body 81, and a lower connecting part 83 arranged at the bottom of the C-shaped steel plate body 81. An upper slot hole 84 is arranged between the upper connecting part 82 and the C-shaped steel plate body 81, and a lower slot hole 85 is arranged between the lower connecting part 83 and the C-shaped steel plate body 81. During use, the two fixture units are respectively installed from both sides of the purlin. The gap between the two C-shaped steel plate bodies, the upper slot hole and the lower slot hole form a mounting hole adapted to the shape of the purlin, realizing the fixed connection of the purlin. Select to install two or more fixtures according to the hoisting requirements.

[0032] A hoisting hole 86 is arranged on the upper connecting part 82, and a connecting hole 87 is arranged on the lower connecting part 83. The two hoisting holes 86 are connected by a shackle, and the two connecting holes 87 are connected by a connecting piece 88; the two fixture units 80 are respectively installed from both sides of the purlin. The gap between the two C-shaped steel plate bodies 81, the upper slot hole 84 and the lower slot hole 85 form a mounting hole adapted to the shape of the purlin; the upper connecting part 82, the lower connecting part 83 and the C-shaped steel plate body 81 are integrally formed; the connecting piece 88 is a bolt, and the two fixture units 80 are detachably connected by using the bolt to pass through the two connecting holes 87.

[0033] The above embodiments are only several explanations of the concept and implementation of the present invention, and are not intended to limit it. Under the concept of the present invention, the technical solutions without substantial transformation are still within the protection scope.

Claims

1. A construction method for a multi-level gabled portal frame structure under height-limited conditions, characterized in that: The mountain-shaped portal frame structure is located in the Guanghua alluvial basin, with many caves and is hoisted and constructed under multi-level height limit conditions. The multi-level height limit includes eight levels from Area A to Area H. The construction includes the following steps: Step 1: Construction planning: The mountain-shaped portal frame structure is divided into three vertical areas: Area I, Area II and Area III. Each vertical area is divided into five horizontal areas. The three vertical areas are simultaneously constructed in sequence in the five horizontal areas. Step 2: Cave filling: Determine the fully filled soil cave area, half filled soil cave area and unfilled soil cave area in the construction area according to the design requirements, and then use sleeve valve pipe grouting to fill the cave according to the filling requirements; Step 3, pipe pile construction: survey and set out work in the construction area, establish a survey control network, select elevation base points as the basis for elevation control during construction, put the pile driver in place for piling, cut the pile section exposed on the ground after the pipe pile is delivered, and then seal the pile top; Step 4, foundation construction: completing foundation construction in the construction area, and setting a plurality of cup-shaped foundations (2) on the foundation; Step 5, steel structure construction: the construction of the five horizontal areas is carried out in sequence in the three vertical areas at the same time. In each horizontal area, S0 is carried out in sequence, and the column reinforcement and adjustment device (3) assists the steel column (1) to be hoisted to the cup-shaped foundation (2); S1, the assembling device (5) assists the portal frame beam (4) to be assembled on the ground; S2, the portal frame beam (4) is hoisted by the limited hoisting height hoisting device (6); S3, the column support, tie rod and water support are hoisted by the limited hoisting height hoisting device (6); S4, the purlin is hoisted by the limited hoisting height hoisting device (6) in conjunction with the purlin hoisting fixture (8).

2. The method for constructing a multi-level gabled portal frame structure under height-limited conditions according to claim 1, characterized in that: The column body reinforcement and adjustment device (3) comprises a frame (30), an upper clamping assembly (31) and a lower adjustment assembly (32); the frame (30) is detachably mounted on the cup-mouth base (2); at least four groups of the upper clamping assemblies (31) are adjustably arranged on the top of the frame (30); at least four groups of the lower adjustment assemblies (32) are adjustably arranged on the bottom of the frame (30); after the at least four groups of the lower adjustment assemblies (32) adjust the alignment of the steel column (1), they are temporarily clamped and fixed by the at least four groups of the upper clamping assemblies (31); the frame (30) is a hexahedral frame structure composed of eight crossbeams (300) and four supporting legs (301); the hexahedral frame structure is fixedly arranged on the cup-mouth base (2); a group of the upper clamping assemblies (31) are arranged on each of the four crossbeams (300) on the upper layer of the frame (30); A group of lower adjustment components (32) are arranged on each of the four crossbeams (300) at the lower layer of the frame (30); the upper clamping component (31) comprises a screw rod (310) and a nut seat (311); the nut seat (311) is detachably mounted on the oblong hole of the crossbeam (300) via the screw rod; the screw rod (310) is threadedly connected in the nut seat (311); the top end of the screw rod (310) abuts against the side wall of the bottom flange of the steel column (1); the lower adjustment component (32) is a hand-cranked flat-bottom jack; a top plate is arranged at the top end of the hand-cranked flat-bottom jack; the top plate abuts against the side wall of the bottom flange of the steel column (1); an L-shaped hook is fixedly arranged at the bottom of the hand-cranked flat-bottom jack; when the top end of the hand-cranked flat-bottom jack abuts against the side wall of the bottom flange of the cup-mouth column (1), the L-shaped hook is laterally hooked on the crossbeam (300).

3. The construction method of a multi-level gabled portal frame structure under height-limited conditions according to claim 2, characterized in that: The S0 is specifically: A0, the inner wall of the installation position of the cup-mouth foundation (2) must be roughened and cleaned first, and the cup-mouth debris must be completely removed. The vertical and horizontal positioning cross lines for the installation of the steel column (1) are drawn on the cup-mouth foundation (2) by measuring instruments, and the bottom elevation of the cup-mouth foundation (2) is measured and set to ensure that the elevation of the steel column (1) is accurate during installation; A1, place the column reinforcement adjustment device (3) on the cup base (2), loosen the four screws (310), and insert the reserved steel column (1) into the installation position; A2, lift the steel column (1) to the installation position by means of a car crane, slowly put it into position manually, place the bottom surfaces of four hand-cranked flat-bottom jacks close to the steel column (1), the L-shaped hooks of the hand-cranked flat-bottom jacks and the lower crossbeam (300) of the frame (30) are pressed against each other and close to each other, and adjust the coordinate position of the steel column (1) by manually cranking the handles of each hand-cranked flat-bottom jack so that the vertical and horizontal positioning cross lines are aligned with the center line of the steel column (1); A3. After the coordinate position is adjusted, tighten the four screws and place them against the flange side wall of the steel column (1). Prepare two theodolites and place them on the north and east sides of the steel column (1) respectively. Measure the center line of the steel column (1). If the longitudinal center line is aligned, the steel column (1) is vertical. If it is not aligned, the steel column (1) needs to be adjusted. The verticality of the steel column (1) is adjusted by adjusting the length of the screw thread until the center line of the steel column (1) in both directions is aligned with the center line of the theodolite. A4. After the plane position, verticality and elevation meet the requirements, check whether all the fixings are firm. After confirmation, release the lifting rope of the truck crane, and the installation of the steel column (1) is completed. A5, concrete is poured inside the cup-shaped foundation (2). Before the concrete reaches the final setting state, the column reinforcement and adjustment device (3) can be removed.

4. The method for constructing a multi-level gabled portal frame structure under height-limited conditions according to claim 1, characterized in that: The assembly device (5) comprises at least two assembly frames (50) and at least two groups of clamping assemblies (51). The at least two assembly frames (50) are placed side by side. Two adjacent assembly frames (50) are connected via a connecting rod (52). A rigid frame unit beam (40) is placed on each assembly frame (50). The rigid frame unit beams (40) are temporarily fixedly connected via two groups of clamping assemblies (51) and assembled into a portal rigid frame beam (4) by screwing bolts. The assembly frame (50) comprises a support (500) and two groups of pillars (501). The two groups of pillars (501) are relatively arranged on the support (500). On both sides, each group of pillars (501) includes two legs, and the two legs are spaced apart to clamp and position the rigid frame unit beam (40); a roller (502) is rotatably arranged at the bottom between the two legs, and a roller (13) is installed on the roller (502); the support (500) includes two cross beams and two longitudinal beams, and the two longitudinal beams are arranged relatively parallel and connected by the two cross beams; the clamping assembly (51) includes a first clamping plate (510) and a second clamping plate (511), the first clamping plate (510) and the second clamping plate (511) have the same shape and size, and the first clamping plate (51 The oblong hole at the top of the first clamping plate (510) and the oblong hole at the top of the second clamping plate (511) are adjustably connected by bolts; a circular hole is opened in the middle of the first clamping plate (510) and the second clamping plate (511), and a perforating cone (53) is arranged between the circular hole and the circular hole opened on the rigid frame unit beam (40); a notch (55) is arranged at the bottom of the first clamping plate (510) and the bottom of the second clamping plate (511) to be clamped at the upper flange or the lower flange of the rigid frame unit beam (40); a notch (55) is arranged at the middle of one side of the first clamping plate (510) and the middle of one side of the second clamping plate (511) A pressing assembly (54) is provided, wherein the pressing assembly (54) comprises a fixing block (540), a nut (541) and a tightening bolt (542); the fixing block (540) is fixedly arranged above the notch (55); a through hole is arranged in the middle of the fixing block (540); a nut (541) is arranged on the fixing block (540) and at the through hole; the tightening bolt (542) is connected to the inner thread of the nut (541); when the clamping assembly (51) is clamped and connected between two adjacent rigid frame unit beams (40), the bottom end of the tightening bolt (542) abuts against the upper flange and the lower flange of the rigid frame unit beam (40).

5. The construction method of a multi-level gabled portal frame structure under height-limited conditions according to claim 4, characterized in that: The S1 is specifically: B0, assembling the assembly tire frame (50) in advance on a flat ground; B1, using a truck crane to lift two sections of the rigid frame unit beams (40) to be assembled onto an assembly frame (50), and sliding the rigid frame unit beams (40) on the assembly frame (50) for preliminary positioning and docking; B2, installing the clamping assembly (51) on the upper flange and the lower flange of the joint of the rigid frame unit beam (40), and temporarily fixing the first clamping plate (510) and the second clamping plate (511) to the rigid frame unit beam (40) respectively through the perforated cone (53), and tightening the clamping assembly (51) further by tightening the jacking bolt (542); B3, the joints of the rigid frame unit beams (40) are connected by high-strength bolts, and the bolts are tightened in the order from the middle to the two ends; B4, remove the clamping assembly (51) and complete the butt assembly of the portal frame beam (4).

6. The method for constructing a multi-level gabled portal frame structure under height-limited conditions according to claim 1, characterized in that: The limited hoisting height hoisting device (6) comprises a steel wire rope (60), a hoisting beam (61) and a plurality of clamp bodies (62), wherein the hoisting beam (61) is provided with a plurality of clamp bodies (62) at intervals, the steel wire rope (60) hung on the automobile hoisting rope has two ends connected to the tops of two clamp bodies (62) among the plurality of clamp bodies (62), and the bottoms of the plurality of clamp bodies (62) are used to connect to the lifting ears of the portal frame beam (4) or the purlin hoisting clamp (8); the clamp body (62) is provided with a mounting hole (620) matching the outer shape of the hoisting beam (61), a hoisting part (63) is provided at both ends of the top and bottom of the clamp body (62), and a plurality of fastening components (65) are symmetrically provided on the front and rear sides of the clamp body (62), and the plurality of fastening components (65) fix the clamp body (62) to the hoisting beam (61); ) is provided with a lifting hole, the lifting hole at the top is connected to the end of the steel wire rope (60), and the lifting hole at the bottom is connected to the lifting ear of the portal frame beam (4) or the purlin lifting fixture (8) through a connecting rope (64); the fastening assembly (65) comprises a base (650) fixedly arranged on the fixture body (62) and an adjusting bolt (651) adjustably mounted on the base (650) through a thread, and a locking nut (652) is arranged on the adjusting bolt (651); four fastening assemblies (65) are arranged on the front side and the rear side of the fixture body (62), two fastening assemblies (65) are located on the left or right side of the mounting hole (620) and are used to abut against the web of the lifting beam (61), and the other two fastening assemblies (65) are located on the upper and lower sides of the mounting hole (620) and are used to abut against the upper and lower wing plates of the lifting beam (61).

7. The method for constructing a multi-level gabled portal frame structure under height-limited conditions according to claim 6, characterized in that: The lifting steps of the limited lifting height lifting device (6) are as follows: C0, placing the hoisting beam (61) on a flat ground, and having an operator insert the clamp body (62) onto the hoisting beam (61) from both ends of the hoisting beam (61), and move it to the hoisting point position; C1, tighten the adjustment bolts (651) on both sides of the clamp body (62) and press them against the upper and lower flanges and the web of the hoisting beam (61) to prevent the clamp body (62) from sliding during the hoisting process; C2, a car-mounted lifting hook, the hook is equipped with a steel wire rope (60), and the steel wire rope (60) is connected to the lifting holes on the upper part of two of the clamp bodies (62) through a shackle; C3, the portal frame beam (4) or the purlin is in place, and the connecting rope (64) is prepared to be connected to the lower lifting hole of the clamp body (62). The lower end of the connecting rope (64) is then connected to the lifting ear of the portal frame beam (4) or the purlin lifting clamp (8) through a shackle. All shackles need to be tightened. The purlin lifting clamp (8) is used to clamp the purlin; C4, after the above preparation work is completed, the truck crane lifts the portal frame beam (4) or the purlin to the installation position, and the construction personnel can install it. After the installation is completed, the connecting rope (64) and the lifting lug of the portal frame beam (4) or the purlin lifting fixture (8) are separated.

8. The method for constructing a multi-level gabled portal frame structure under height-limited conditions according to claim 7, characterized in that: The purlin hoisting fixture (8) comprises two detachably connected fixture monomers (80), wherein the fixture monomer (80) comprises a C-shaped steel plate body (81), an upper connecting portion (82) arranged at the top of the C-shaped steel plate body (81), and a lower connecting portion (83) arranged at the bottom of the C-shaped steel plate body (81); an upper slot hole (84) is arranged between the upper connecting portion (82) and the C-shaped steel plate body (81), and a lower slot hole (85) is arranged between the lower connecting portion (83) and the C-shaped steel plate body (81); a hoisting hole (86) is arranged on the upper connecting portion (82), and a hoisting hole (86) is arranged on the lower connecting portion (83). A connecting hole (87) is arranged on the upper part, two lifting holes (86) are connected by a shackle, and the two connecting holes (87) are connected by a connecting piece (88); the two clamp monomers (80) are respectively installed on both sides of the purlin, and the gap between the two C-shaped steel plate bodies (81), the upper slot hole (84) and the lower slot hole (85) form a mounting hole that matches the shape of the purlin; the upper connecting part (82), the lower connecting part (83) and the C-shaped steel plate body (81) are integrally formed; the connecting piece (88) is a bolt, and the bolt is used to pass through the two connecting holes (87) to detachably connect the two clamp monomers (80).

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