Construction method of large-inclination huge steel pipe column core tube through basement roof plate

Abstract

The application discloses a construction method for a large-inclination huge steel pipe column core tube penetrating a basement roof, and adopts the following steps: 1) a BIM model is established, animation deduction simulation is adopted to simulate the construction process of key procedures, and the on-site construction is guided, so that the predictability of the construction site is improved, and the safety risk in the construction process is reduced; 2) a steel pipe column foundation bolt is installed, a positioning frame is adopted to pre-bury and fix the steel pipe column foundation bolt, the adjustment of the plane position and the elevation is facilitated, the pre-burying precision is improved, and the deviation of the bolt in the concrete pouring process is prevented; 3) the steel pipe column is positioned and installed, wherein the spatial special-shaped pipe inclined column adopts multiple spatial accurate positioning, and the problem of spatial positioning of the large-inclination huge steel pipe is solved; and 4) large-span super-heavy steel box girder positioning and installation are adopted, multiple spatial accurate positioning is adopted, and an operation hole is reserved on a cover plate, so that welding is facilitated, and the on-site welding quality of a steel box girder butt joint is improved.

Description

Technical Field

[0001] This invention relates to a steel structure installation method, and more particularly to a construction method for a large-angle giant steel pipe column core tube penetrating the basement roof slab. Background Technology

[0002] The core tube is the central part of a building, forming an outer frame and inner tube structure with the external frame. This structure is highly beneficial for structural stress and has excellent seismic performance, making it a mainstream structural form widely used in super high-rise and large-span buildings internationally. Furthermore, this structure offers the advantage of maximizing usable space, concentrating various auxiliary service spaces in the center of the floor plan, ensuring the main functional spaces occupy optimal lighting positions, and achieving good views and convenient internal circulation. However, with the continuous evolution of building shapes, the spatial inclination angle of steel pipe columns supporting the core tube structure increases, exponentially increasing the difficulty of positioning and installation. Traditional steel structure positioning and installation methods are insufficient to guarantee the installation accuracy of steel pipe columns with large inclination angles.

[0003] A certain engineering project features a barrel-shaped, multi-layered, horseshoe-shaped curved spatial steel structure with a height of 24 meters. It has one basement level and five above-ground levels, with a concrete-filled steel pipe column lower section and a steel structure upper section, using a total of 7500 tons of steel. The building consists of three parts: a large-angle mega-steel column core tube, a large-span steel structure hyperboloid oblique grid truss, and platform beams between the trusses. The project has seven large-angle mega-steel column core tubes. The core tubes employ a barrel-shaped support system with a contracting bottom and expanding top. They consist of four steel pipe columns with a diameter of 1100mm or 1000mm and a wall thickness of 40mm passing through the basement roof slab. Determining the centroid and center of gravity is difficult, making installation and positioning challenging and prone to assembly deviations. Conventional methods for positioning and installing irregularly shaped steel pipe columns often involve multi-point layout using a total station to determine the spatial position. This requires numerous survey points and has poor positioning accuracy, making it unsuitable for installing the steel pipe columns in the large-angle mega-steel column core tubes. The box girders between the steel pipe columns have parallelogram cross-sections, large spans, and heavy weights. Conventional installation methods often involve direct hoisting using lifting machinery. However, positioning the steel box girders in space is difficult, inaccurate, and requires prolonged use of large machinery, resulting in high construction costs. Furthermore, the on-site welding work after high-altitude positioning is extensive, and welding quality is difficult to guarantee. Both the above-ground steel pipe columns and box girders need to be installed on the basement roof slab. The basement roof slab has limited load-bearing capacity, requiring localized reinforcement. The conventional method for backfilling reinforcement involves densifying the uprights in the formwork support system. However, this formwork support system under the basement roof slab is not removed during steel structure construction, leading to high material consumption, long construction time, and high costs. Summary of the Invention

[0004] This invention provides a construction method for a large-angle giant steel pipe column core tube penetrating the basement roof slab to solve the technical problems existing in the prior art. This method has accurate positioning, convenient installation, good installation quality and low cost.

[0005] The technical solution adopted by this invention to solve the technical problems existing in the prior art is: a construction method for a large-angle giant steel pipe column core tube penetrating the basement roof slab, comprising the following steps: 1) Establishing a BIM model and using animation simulation to guide the construction process of key procedures; 2) Installing the anchor bolts of the steel pipe column, using a positioning frame to pre-embed and fix the anchor bolts of the steel pipe column. The positioning frame has a horizontally arranged upper ring plate and a lower ring plate. The outer dimensions of the upper ring plate and the lower ring plate are the same as those of the column base plate and are connected together by at least three vertically arranged steel bars. A cross positioning plate is connected inside the upper ring plate, and anchor bolt positioning holes are provided on the upper ring plate and the lower ring plate; During construction, the anchor bolts are first inserted one by one into the positioning frame, and then, according to the design... The elevation determines the vertical position of the anchor bolts, and then they are spot-welded to the positioning frame to form a whole; the planar position of the positioning frame and the anchor bolts is controlled by aligning the cross lines of the cross positioning plate with the anchor bolt positioning cross lines pre-marked on the foundation; then the top elevation of the cross positioning plate is finely adjusted according to the design elevation of the anchor bolts, and then the positioning frame is welded to the foundation reinforcement to complete the pre-embedded fixing of the anchor bolts; 3) The steel pipe column positioning and installation adopts the following steps: 3.1) Segmentation, the first column section is a straight round pipe column, the second column section is a inclined round pipe column, and the third and above column sections are spatial irregular round pipe inclined columns. The upper part of the spatial irregular round pipe inclined column is provided with two cantilever beams, and at least three circumferential positioning plates are set at the upper end of the second column section and the joint end of the third and above column sections; 3.2) 3.3) Install the first column section; 3.4) After the second column section is installed, pour the basement roof slab. Then, according to the crane position and load conditions, mark multiple anti-roof areas on the basement roof slab. Multiple anti-roof areas use one support unit in a cycle. The support unit includes multiple support components. Each support component includes at least one steel support. The steel support includes a support column and a hydraulic jack set on a fixed base plate. A horizontally set support base plate is fixed to the top of the support column. The hydraulic jack is mounted on the support base plate; 3.5) Positioning and installation of the third and above column sections: A 1:1 scale model of the spatial irregular circular tube inclined column is created using CAD software, and the horizontal projections of the two cantilever beams and their center lines of the installation column section are obtained. This horizontal projection line is then laid out on the ground at the construction site. During installation, first, the circumferential positioning plate of the installation column section is aligned vertically with the circumferential positioning plate of the column section below it, and the two column section positioning clamps on the left and right sides are used to clamp and align them, and the column section positioning clamp connecting bolts are inserted. Then, a plumb bob is suspended at the center line of each of the two cantilever beams of the installation column section, and the position of the installation column section is adjusted so that the plumb bob is aligned with the corresponding horizontal projection line on the ground. Finally, the column section positioning clamp connecting bolts are tightened. 4) Positioning and installation of large-span, heavy-duty steel box girders: Before installation, construction operation areas are reserved on the top plates at both ends of the steel box girder. At the opening, width-oriented positioning plates are welded to the bottom plates of the steel box girder and cantilever beam. During installation, lifting machinery is used to hoist the steel box girder to the predetermined position, aligning the steel box girder and the bottom plate of the cantilever beam. The alignment method is as follows: the width-oriented positioning plates on the bottom plates of the steel box girder and the cantilever beam are clamped and aligned using two box girder width-oriented positioning clamps on the left and right sides, and the box girder width-oriented positioning clamp connecting bolts are inserted. Then, the position of the steel box girder is adjusted so that the web of the steel box girder and the cantilever beam are aligned. An inner lining plate is installed at the joint of the web plates, and the inner lining plate is connected to the web plate with fastening bolts. Then, the box girder width-oriented positioning clamp connecting bolts are tightened. At this point, the lifting machinery can be unhooked. Through the operating opening, the bottom plates of the steel box girder and the cantilever beam are welded together inside the steel box girder. After the welding of the steel box girder and the cantilever beam is completed, a cover plate is welded onto the construction operating opening.

[0006] In step 3.5), when working at height, a column-mounted operating platform is used, including a horizontally positioned platform body. The platform body has a U-shaped structure and rests against a steel pipe column. The two are connected by a connecting seat, a connecting plate, and a positioning plate. There are three positioning plates fixed to the steel pipe column, arranged circumferentially at three quadrant points. There are three connecting seats fixed to the platform body, corresponding one-to-one with the positioning plates. The corresponding connecting seats and positioning plates are connected by a connecting plate. The connecting plate is bolted to the connecting seats and positioning plates respectively. A guardrail is provided at the outer edge of the platform body.

[0007] In step 3.2), the base plate and the first column section are separate. During installation, the base plate is first fixed to the anchor bolts of the steel pipe column, and then the first column section is installed.

[0008] The advantages and positive effects of this invention are:

[0009] 1) Before construction, virtual construction is carried out using simulation technology. Animation simulation is used in dense component areas and key nodes to simulate crane positions and member installation. Based on the simulation results, the lifting machinery is reasonably arranged on site, and the installation sequence of each member is determined to improve the predictability of on-site construction and make the construction site organization reasonable.

[0010] 2) The use of an integral positioning method for pre-embedding anchor bolts greatly improves the pre-embedding accuracy. The positioning frame makes the multiple anchor bolts under each steel pipe column form a stable whole, which facilitates the adjustment of the plane position and elevation, improves the pre-embedding accuracy, and also prevents the bolts from shifting during the concrete pouring process.

[0011] 3) Employing three-dimensional coordinate transformation technology for spatial positioning of irregularly shaped steel pipe columns improves installation quality. By rationally segmenting the steel pipe columns, spatial irregularly shaped circular inclined columns with cantilever beams are created. Circumferential positioning plates are installed at the joint ends of the column sections, connecting the upper and lower sections with bolts, ensuring their relative positions. A limiting plate is welded to the centerline of the cantilever beam end, and a plumb bob is attached. A chain hoist is used to adjust the installed column sections, aligning the plumb bob lowered from the beam end with the marked line on the ground, ensuring the cantilever beam's planar position. This precise spatial positioning of the steel pipe columns solves the problem of spatial positioning of large-angle giant steel pipes.

[0012] 4) Reusing a single support unit for partial top-mounting of the basement roof slab strengthens the slab's load-bearing capacity and significantly reduces construction costs. Tekla software was used to simulate the crane's travel path and steel column installation conditions. Based on the simulation results, the basement roof slab was divided into a driveway, crane station area, and temporary component storage area. The top-mounting area of ​​the floor slab within each functional area was determined according to the construction load requirements. A single support unit was reused, with each unit employing multiple distributed, adjustable support components. This allowed for adjustable support force at each top-mounting position within each top-mounting area, facilitating localized support reinforcement and meeting different load-bearing requirements such as localized loading, large dynamic loads, and surcharges. The cyclical use of multiple top-mounting areas within a single support unit significantly reduced construction costs while ensuring the structural safety of the floor slab.

[0013] 5) The use of a column-mounted operating platform provides working space for the high-altitude installation of steel pipe columns, which is convenient and cost-effective. The use of a column-mounted operating platform, whose height can be increased according to the structure, for the construction of irregularly shaped circular pipe inclined columns significantly expands the working surface for steel pipe column installation compared to full-span scaffolding. This facilitates pipe section hoisting and improves the installation quality of the steel pipe columns. Positioning plates are welded onto the irregularly shaped circular pipe inclined columns, and the connecting plates of the platform body are connected to the positioning plates, allowing the platform to be hung on the irregularly shaped circular pipe inclined columns. The platform's installation position is adjustable, and its height can be increased according to the structure. Installation and dismantling are convenient, efficient, cost-effective, and easy to use. This greatly reduces scaffolding erection and dismantling time, saves labor and machinery costs, and provides good stability and safety. It also avoids the need for scaffolding erection and dismantling, effectively saving labor and machinery costs.

[0014] 6) The use of multi-point limiting and reserved operating openings for welding improves the installation quality of the steel box girder. Bolt limiting is used on the bottom plate and web of the steel box girder, improving the accuracy of the high-altitude alignment. After the bolts at the corresponding positions on the bottom plate and web are tightened, the crane can be unhooked, reducing the time spent using large machinery and lowering construction costs. Reserved openings are used in the box girder cover plate, and all steel plates have internal bevels. On-site welding is done using both flat and vertical welding. Compared to using overhead welding to weld the bottom plate joint on the outside of the box girder, this installation structure makes it easier to ensure welding quality. Attached Figure Description

[0015] Figure 1 This is a flowchart illustrating the construction process of the present invention.

[0016] Figure 2 This is a schematic diagram of a large-angle giant steel pipe column core tube structure constructed using the present invention;

[0017] Figure 3 A schematic diagram of step 2) of the present invention, showing the positioning of anchor bolts using a positioning frame;

[0018] Figure 4 A schematic diagram of step 2) of the present invention, showing the anchor bolts being installed on the positioning frame;

[0019] Figure 5 A schematic diagram of the positioning frame structure used in step 2 of this invention;

[0020] Figure 6 This is a schematic diagram of step 3.4 of the present invention;

[0021] Figure 7 This is a schematic diagram of the steel support structure used in step 3.4 of the present invention;

[0022] Figure 8 A construction diagram of step 3.5 of this invention;

[0023] Figure 9 for Figure 8 Enlarged view of part A;

[0024] Figure 10 for Figure 8 Enlarged view of part B;

[0025] Figure 11 This is a schematic diagram of the structure of the column-mounted operating platform used in step 3.5 of the present invention;

[0026] Figure 12 This is a schematic diagram of the structure of the column-mounted operating platform used in step 3.5 of the present invention;

[0027] Figure 13 This is an enlarged view of the connection node between the column-mounted operating platform and the steel pipe column used in step 3.5 of the present invention;

[0028] Figure 14 This is a construction diagram of step 4) of the present invention;

[0029] Figure 15 for Figure 14 Enlarged view of part A;

[0030] Figure 16 for Figure 15 A bottom view.

[0031] In the diagram: 1. Steel pipe column; 2. Steel box girder; 3. Positioning frame; 3-1. Upper ring plate; 3-2. Reinforcing steel; 3-3. Lower ring plate; 3-4. Cross positioning plate; 4. Anchor bolts; 5. Foundation reinforcing steel; 6. Spatial irregular circular tube inclined column; 7. Cantilever beam; 8. Circumferential positioning plate; 9. Column section positioning clamp; 10. Column section positioning clamp connecting bolts; 11. Plumb bob; 12. Horizontal projection line; 13. Platform main body; 14. Connecting seat; 15. Connecting plate; 16. Positioning plate; 17. Guardrail; 18. Construction operation opening; 19. Width positioning plate; 20. Box girder width positioning clamp; 21. Box girder width positioning clamp connecting bolts; 22. Inner lining plate; 23. Fastening bolts; 24. Column; 25. Fixed base plate; 26. Hydraulic jack; 27. Diagonal brace; 28. Support base plate. Detailed Implementation

[0032] To further understand the invention's content, features, and effects, the following embodiments are provided, and detailed descriptions are given below in conjunction with the accompanying drawings:

[0033] Please see Figure 2 This is a type of large-angle, giant steel pipe column core tube, employing a barrel-shaped support system with a converging bottom and expanding top. It consists of four steel pipe columns 1 and inter-column steel box girders 2. Each steel pipe column 1 weighs up to 70 tons and is a multi-angle, irregularly shaped spatial component. The inter-column steel box girders have a parallelogram cross-section and are large-span, ultra-heavy steel box girders. The spatial positioning of the core tube is extremely difficult, and the installation error is immeasurable.

[0034] Please see Figure 1 This invention provides a construction method for a large-angle giant steel pipe column core tube penetrating the roof slab of a basement, comprising the following steps:

[0035] 1) Establish a BIM model and use animation simulation to guide on-site construction, improve the predictability of the construction site, and reduce safety risks during construction.

[0036] 2) For the installation of anchor bolts for steel pipe columns, please refer to [link / reference]. Figures 3-5 The anchor bolts 4 of the steel pipe column are pre-embedded and fixed using a positioning frame 3. The positioning frame 3 has a horizontally arranged upper ring plate 3-1 and a lower ring plate 3-3. The outer dimensions of the upper ring plate 3-1 and the lower ring plate 3-3 are the same as those of the column base plate and are connected together by at least three vertically arranged steel bars 3-2. A cross positioning plate 3-4 is connected inside the upper ring plate 3-1. Anchor bolt positioning holes are provided on the upper ring plate 3-1 and the lower ring plate 3-3. During construction, the anchor bolts 4 are first inserted into the positioning frame 3 one by one, and the vertical position of the anchor bolts 4 is determined according to the design elevation. Then, they are spot-welded to the positioning frame 3 to form a whole. The planar position of the positioning frame 3 and the anchor bolts 4 is controlled by aligning the cross lines of the cross positioning plate 3-4 with the anchor bolt positioning cross lines pre-marked on the foundation. Then, the top elevation of the cross positioning plate 3-4 is finely adjusted according to the design elevation of the anchor bolts 4. Finally, the positioning frame 3 is welded to the foundation steel bars 5 to complete the pre-embedding and fixing of the anchor bolts.

[0037] By using the positioning frame 3, the planar position of the anchor bolt 4 is determined by the upper ring plate 3-1 and lower ring plate 3-3 connected together and having bolt holes, as well as the cross positioning plate 3-4 inside the upper ring plate. The vertical position of the anchor bolt 4 is determined by the upper ring plate 3-1 of the positioning frame 3 and the design elevation of the anchor bolt 4. The anchor bolt 4 and the positioning frame 3 are integrated into a whole and welded to the foundation steel bar 5. The positioning is accurate and stable, the construction is convenient and efficient, and the pre-embedding quality of the anchor bolts can be improved.

[0038] 3) Positioning and installation of steel pipe columns

[0039] 3.1) Segmentation: the first column is a straight cylindrical tube, the second column is a slanted cylindrical tube, and the third and above columns are spatial irregular cylindrical tube slanted columns. The upper part of the spatial irregular cylindrical tube slanted column 6 is provided with two cantilever beams 7, and at least three circumferential positioning plates 8 are provided at the upper end of the second column and the docking end of the third and above columns.

[0040] 3.2) The first column section can be installed using existing construction methods. In this embodiment, the base plate and the first column section are separate. During installation, the base plate is first fixed to the anchor bolts 4 of the steel pipe column, and then the first column section is installed. The base plate and the column section are separated and installed separately, which makes it easy to adjust the elevation of the column base plate and facilitates construction.

[0041] 3.3) Install the second column section using existing construction methods.

[0042] 3.4) After the second column section is installed, the basement roof slab is poured. Then, based on the crane position and load conditions, multiple anti-roof areas are marked on the basement roof slab. Multiple anti-roof areas share a single support unit. Each support unit includes multiple support components, each including at least one steel support. The steel support includes a support column 24 mounted on a fixed base plate 25 and a hydraulic jack 26. A horizontally mounted support base plate 28 is fixed to the top of the support column 24, and the hydraulic jack 26 is mounted on the support base plate 28. (See also...) Figures 6-7 .

[0043] Preferred embodiment: Diagonal braces 27 are provided around the lower part of the supporting column 24. The diagonal braces 27 are fixed between the fixed base plate 25 and the supporting column 24 to improve the stability of the supporting column. The supporting column 24 is welded from H-beams in sections, which is convenient to manufacture and has a reliable structure.

[0044] First, BIM software was used to simulate the installation of the column sections above ground. Based on the simulation results, the concrete floor slab was divided into a driveway, a crane station area, and a temporary storage area for structural members. The inverted support area for each functional area was determined according to the construction load requirements. Then, the scale and quantity of supporting components were determined based on the load-bearing requirements of the inverted support area. The basement of the aforementioned steel structure has a clear height of 6.1m. The steel supports use 400*400 H-beams, divided into three sections, each 2m long, connected by bolts. A steel plate is welded to the top, and hydraulic jacks are mounted on the steel plate to reverse the slab's load. The steel supports can be flexibly arranged and reused; disassembly and assembly can be completed using only a hand-operated hoist, greatly reducing construction costs. Using an inverted support structure to support the basement roof slab can meet the requirements of large machinery operations and load stacking in the upper area.

[0045] 3.5) For the positioning and installation of the third and subsequent column sections, please refer to [link / reference needed]. Figures 8-10A model of the spatial irregular circular tube inclined column 6 was created using CAD software at a 1:1 scale, and the horizontal projections of the two cantilever beams 7 and their center lines of the installation column section were obtained. The horizontal projection line 12 was laid out on the ground at the construction site. During installation, the circumferential positioning plate 8 of the installation column section was first aligned vertically with the circumferential positioning plate 8 of the column section below it, and the two column section positioning clamps 9 were used to clamp and align them, and the column section positioning clamp connecting bolts 10 were inserted. Then, a plumb bob 11 was suspended at the center line of each of the two cantilever beams 7 of the installation column section, and the position of the installation column section was adjusted so that the plumb bob 11 was aligned with the corresponding horizontal projection line 12 on the ground. Finally, the column section positioning clamp connecting bolts 10 were tightened.

[0046] Aligning the upper and lower circumferential positioning plates 8 allows for the preliminary determination of the relative circumferential positions of the upper and lower column sections, enabling temporary spatial positioning of the installed column sections and reducing the usage time of large lifting machinery. Using the plumb bob 11 as a positioning tool and the horizontal projection line 12 of the cantilever beam centerline laid out on the ground as a reference, the cantilever beam 7 is measured to accurately locate the position of the installed column section. Finally, by combining the three-dimensional data from measuring instruments such as a total station, the final position of the installed column section can be determined. The positioning accuracy is high, which can reduce the number of times measuring instruments such as a total station are used. The spatial positioning installation operation is simple and can reduce construction costs. When the positioning and installation of the aforementioned spatial irregular circular tube inclined column 6 is a high-altitude operation, a column-hugging operating platform is used, as shown in Figures 11-13. The column-hugging operating platform includes a horizontally set platform body 13. The platform body 13 adopts a U-shaped structure and hugs the steel pipe column. The two are connected by a connecting seat 14, a connecting plate 15, and a positioning plate 16. The positioning plate 16 is fixed to the spatial irregular circular tube inclined column 6, and there are three of them, arranged circumferentially at three quadrant points. The connecting seat 14 is fixed to the platform body 13, and there are three of them, corresponding one-to-one with the positioning plate 16. The corresponding connecting seat 14 and positioning plate 16 are connected by a connecting plate 15. The connecting plate 15 is bolted to the connecting seat 14 and the positioning plate 16 respectively. A guardrail 17 is provided at the outer edge of the platform body.

[0047] The platform body 13 and the spatial irregular circular tube inclined column 6 are connected by bolts using connecting components, resulting in good structural stability and reliability. The installation position is adjustable, making it convenient to use. The platform is lightweight, easy to install, highly efficient, and low in installation cost. Furthermore, its simple structure, ease of manufacture, reusability, and low cost further contribute to its success.

[0048] 4) For the positioning and installation of large-span, ultra-heavy steel box girders, please refer to [link / reference]. Figures 14-16Before installing the steel box girder 2, construction operation openings 18 are reserved on the top plates at both ends of the steel box girder 2. Wide-direction positioning plates 19 are welded onto the bottom plates of the steel box girder 2 and the cantilever beam 7. During installation, lifting machinery is used to hoist the steel box girder 2 to the predetermined position, aligning the steel box girder 2 and the bottom plate of the cantilever beam 7. The alignment method is as follows: the wide-direction positioning plates 19 on the bottom plates of the steel box girder 2 and the cantilever beam 7 are clamped and aligned using two left and right wide-direction positioning clamps 20, and the connecting bolts 21 for the wide-direction positioning clamps are inserted. Then, the steel box girder 2 is adjusted... Position the box girder 2 so that the webs of the steel box girder 2 and the cantilever beam 7 are aligned. An inner lining plate 22 is installed at the web joint. The inner lining plate 22 is connected to the web by fastening bolts 23. Then, tighten the box girder width positioning clamp connecting bolts 21. At this time, the lifting machinery can be unhooked. The bottom plates of the steel box girder 2 and the cantilever beam 7 are welded together inside the steel box girder 2 through the construction operation opening 18. After the welding of the steel box girder 2 and the cantilever beam 7 is completed, a cover plate is welded on the construction operation opening.

[0049] The bottom plate and web of the steel box girder are bolted to limit the positioning, which improves the accuracy of the high-altitude alignment of the steel box girder; after the bolts at the corresponding positions of the bottom plate and web are tightened, the crane can be unhooked, which reduces the use time of large machinery and lowers the construction cost; the box girder cover plate has reserved openings, and all steel plates have internal bevels. On-site welding is all flat welding and vertical welding. Compared with the use of overhead welding to weld the bottom plate joint on the outside of the box girder, this installation structure makes it easier to ensure the welding quality.

[0050] Although preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other modifications under the guidance of the present invention without departing from the spirit and scope of the claims, and all of these modifications are within the scope of protection of the present invention.

Claims

1. A construction method for a large-angled mega-steel pipe column core tube penetrating the roof slab of a basement, characterized in that, The following steps are adopted: 1) Establish a BIM model and use animation simulation to guide on-site construction; 2) For the installation of anchor bolts for steel pipe columns, a positioning frame is used to pre-embed and fix the anchor bolts. The positioning frame has a horizontally arranged upper ring plate and a lower ring plate. The outer dimensions of the upper ring plate and the lower ring plate are the same as those of the column base plate and they are connected together by at least three vertically arranged steel bars. A cross positioning plate is connected inside the upper ring plate, and anchor bolt positioning holes are provided on the upper ring plate and the lower ring plate. During construction, the anchor bolts are first inserted into the positioning frame one by one, and the vertical position of the anchor bolts is determined according to the design elevation. Then, they are spot-welded to the positioning frame to form a whole. The planar position of the positioning frame and the anchor bolts is controlled by aligning the cross lines of the cross positioning plate with the anchor bolt positioning cross lines pre-marked on the foundation. Then, the top elevation of the cross positioning plate is finely adjusted according to the design elevation of the anchor bolts. Finally, the positioning frame is welded to the foundation steel bars to complete the pre-embedded fixing of the anchor bolts. 3) The steel pipe column positioning and installation shall be carried out in the following steps: 3.1) Segmentation: the first column is a straight cylindrical tube, the second column is a slanted cylindrical tube, and the third and above columns are spatial irregular cylindrical tube slanted columns. The upper part of the spatial irregular cylindrical tube slanted column is provided with two cantilever beams, and at least three circumferential positioning plates are provided at the upper end of the second column and the joint end of the third and above columns. 3.2) Install the first column section; 3.3) Install the second column section; 3.4) After the second column section is installed, the basement roof slab is poured. Then, according to the crane position and load conditions, multiple anti-top areas are marked on the basement roof slab. Multiple anti-top areas use one support unit in a cycle. The support unit includes multiple support components. Each support component includes at least one steel support. The steel support includes a support column and a hydraulic jack set on a fixed base plate. A horizontally set support base plate is fixed to the top of the support column. The hydraulic jack is mounted on the support base plate. 3.5) Positioning and installation of the third and subsequent column sections: A 1:1 scale model of the spatial irregular circular tube inclined column was created using CAD software, and the horizontal projections of the two cantilever beams and their center lines of the installation column section were obtained. The horizontal projection lines were laid out on the ground at the construction site. During installation, the circumferential positioning plates of the installation column section were first aligned vertically with the circumferential positioning plates of the column section below it, and then the left and right column section positioning clamps were used to clamp and align them, and the column section positioning clamp connecting bolts were inserted. Then, a plumb bob was suspended at the center line of each of the two cantilever beams of the installation column section, and the position of the installation column section was adjusted so that the plumb bobs were aligned with the corresponding horizontal projection lines on the ground. Finally, the column section positioning clamp connecting bolts were tightened. 4) Positioning and installation of large-span, heavy-duty steel box girders: Before installation, construction operation openings are reserved on the top plates at both ends of the steel box girder. Wide-direction positioning plates are welded onto the bottom plates of the steel box girder and the cantilever beam. During installation, lifting machinery is used to hoist the steel box girder to the predetermined position, aligning the steel box girder and the bottom plate of the cantilever beam. The alignment method is as follows: the wide-direction positioning plates on the bottom plates of the steel box girder and the cantilever beam are clamped and aligned using two box girder wide-direction positioning clamps on the left and right sides, and the box girder wide-direction positioning clamp connecting bolts are inserted. Then, the position of the steel box girder is adjusted to align the web of the steel box girder and the cantilever beam. An inner lining plate is installed at the web joint, and the inner lining plate is connected to the web with fastening bolts. Then, the box girder wide-direction positioning clamp connecting bolts are tightened. At this time, the lifting machinery can be unhooked. The bottom plates of the steel box girder and the cantilever beam are welded together inside the steel box girder through the operation openings. After the welding of the steel box girder and the cantilever beam is completed, a cover plate is welded onto the construction operation openings.

2. The construction method for the core tube of a large-angle giant steel pipe column penetrating the roof slab of a basement as described in claim 1, is characterized in that, In step 3.5), when working at height, a column-mounted operating platform is used, including a horizontally set platform body. The platform body adopts a U-shaped structure and is supported by a steel pipe column. The two are connected by a connecting seat, a connecting plate, and a positioning plate. There are three positioning plates fixed to the steel pipe column, arranged circumferentially at three quadrant points. There are three connecting seats fixed to the platform body, corresponding one-to-one with the positioning plates. The corresponding connecting seats and positioning plates are connected by a connecting plate. The connecting plate is bolted to the connecting seat and the positioning plate respectively. A guardrail is provided at the outer edge of the platform body.

3. The construction method for the core tube of a large-angled mega-steel pipe column penetrating the basement roof slab according to claim 1, characterized in that, In step 3.2), the base plate and the first column section are separate. During installation, the base plate is first fixed to the anchor bolts of the steel pipe column, and then the first column section is installed.

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