Construction method of steel structure with foundation crossing land and water boundary

Abstract

The invention discloses a construction method of a steel structure with a foundation crossing a land and water boundary, the steel structure comprises an arc-shaped building area, a central building area, an overhead platform and a circular building area, the arc-shaped building area is connected to the south-west side of the arc-shaped building area, and the circular building area is connected to the north side of the central building area through the overhead platform. The heart-shaped area at the joint of the arc-shaped building area and the central building area is on the lake surface, and other areas are on the land. The construction method comprises the following steps that firstly, the construction sequence is determined; secondly, a steel trestle platform is erected; step 3, tower crane arrangement; and fourthly, a steel structure is erected. The construction method is suitable for the building structure part on the lake surface, the construction sequence is reasonable and orderly, the construction period is effectively shortened, the construction cost is saved, and reference and popularization values are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a construction method of a steel structure with a foundation spanning a boundary line between land and water. Background Art

[0002] A certain mountain construction project is located on a mountain slope and near a lake. The location is relatively low compared to the surrounding terrain. The water of the lake on the site includes surface runoff of rainwater outside the red line, underground runoff and rainwater replenishment on the site. Some building structures are above the lake, but the owner requires that the lake water be retained for construction. In this project, the building structure is composed of four parts: an arc-shaped building area, a central building area, an overhead platform and a circular building area. One of the heart-shaped areas is located above the lake. When building the steel structure, due to the unique shape of the building structure and the complex topography, in order to shorten the construction period and save construction costs, a reasonable and orderly construction plan is needed to solve the construction problems of special-shaped steel structures in complex environments. Summary of the invention

[0003] The purpose of the present invention is to provide a steel structure with a foundation spanning the boundary between land and water and a construction method thereof, which solves the construction problem of special-shaped steel structures in complex environments.

[0004] To achieve the above object, the present invention adopts the following technical solutions: A construction method for a steel structure whose foundation spans the boundary between land and water, wherein the steel structure comprises an arc-shaped building area, a central building area, an overhead platform and a circular building area, wherein the arc-shaped building area is connected to the southwest side of the arc-shaped building area, the circular building area is connected to the north side of the central building area through the overhead platform, the heart-shaped area at the intersection of the arc-shaped building area and the central building area is on the lake surface, and the rest of the area is on land; The construction method comprises the following steps: Step 1: Determine the construction sequence: construct the arc-shaped building area, the central building area, the overhead platform and the circular building area in sequence; Step 2: Steel trestle platform erection: Divide the steel trestle platform into the first installation area, the second installation area, the third installation area and the fourth installation area in the order of construction from the narrow area to the wide area. First, lower the lake level, and then use the fishing method to construct steel pipe piles, support frames and steel trestle platforms simultaneously within the lake surface range corresponding to the heart-shaped area; Step 3, tower crane arrangement: a 1# tower crane is arranged at the junction of the overhead platform and the circular building area, and a 1# steel component yard is arranged in the overhead platform; a 2# tower crane is arranged in the atrium area of ​​the central building area, and a 2# steel component yard is arranged in the area; a 3# tower crane is arranged at the edge of the central building area, and a 3# steel component yard is arranged outside the central building area; a 4# tower crane is arranged in the atrium area of ​​the curved building area, and a 4# steel component yard is arranged in the area; Step 4, steel structure erection: the arc-shaped building area and the central building area are constructed alternately, and after the arc-shaped building area is completed, the central building area and the overhead platform continue to be constructed alternately, while the circular building area and the overhead platform are constructed at the same time, and the heart-shaped area is constructed on the steel trestle platform.

[0005] Preferably, in step one, the arc-shaped building area is divided into three areas A-1, A-2 and A-3, and each floor is constructed in a counterclockwise order starting from A-1; the central building area is divided into five areas B-1, B-2, B-3, B-4 and B-5, and each floor is constructed simultaneously from areas B-1 and B-2 and transferred to the next area in the back direction.

[0006] Preferably, in step 2, the support frame includes Bailey beams, support columns, support beams and lakeside retaining walls, multiple support columns are supported on the bottom of the lake and are at the same height as the lakeside retaining wall, support beams are arranged on the tops of the support columns and the tops of the lakeside retaining wall, multiple Bailey beams are arranged on the support beams, and the first installation area, the second installation area, the third installation area and the fourth installation area are laid on the Bailey beams.

[0007] Preferably, the steel trestle platform includes a first installation area, a second installation area, a third installation area and a fourth installation area.

[0008] Preferably, in step 2, the specific steps of the fishing method are: S0, measurement and layout, steel pipe pile positioning, crawler crane driving the steel pipe piles of the first trestle hole; S1, install steel pipe piles, support columns, install support beams, and hoist Bailey beams as a whole by crawler crane; S2, suspend the Bailey beam forward, set the pile guide frame on the Bailey beam, lay the first installation area, and then the crawler crane goes up to the trestle to continue to suspend the support column forward; S3, repeat S1 and S2 until the fourth installation area is laid.

[0009] Preferably, the curved building area components are stacked in the 4# steel component yard and lifted by the 1# tower crane, the central building area components are stacked in the 2# steel component yard based on the proximity principle and lifted by the 2# tower crane or stacked in the 3# steel component yard and lifted by the 3# tower crane, and the overhead platform and circular building area are stacked in the 1# steel component yard and lifted by the 4# tower crane.

[0010] Preferably, the step 4 is specifically as follows: A0, the first floor structure of the curved building area is a steel-concrete structure. The first floor steel columns are installed, corrected and grouting is performed twice, and then the first floor steel bars are tied and the formwork is supported; A1, install and correct the steel columns on the second floor of the curved building area, then connect the frame beams between the steel columns, and install and correct the steel columns on the first floor of the central building area at the same time, and perform secondary grouting; then tie the steel bars and support the formwork on the second floor of the curved building area and the first floor of the central building area; A2, install and correct the third-floor steel columns in the curved building area, and then connect the frame beams between the steel columns. At the same time, install and correct the second-floor steel columns in the central building area, and then connect the frame beams between the steel columns. Then, tie the steel bars and support the formwork for the third-floor floor of the curved building area and the second-floor floor of the central building area. A3, repeat A2 until the reinforcement and formwork support of the fifth floor of the curved building area and the reinforcement and formwork support of the fourth floor of the central building area are completed; A4, installation and correction of the five-story steel columns in the central building area, and then connection of frame beams between steel columns, and then binding of steel bars and formwork support for the five-story floor of the central building area; at the same time, connection of steel columns from the first to the third floor of the overhead platform and circular building area, connection of frame beams between steel columns, binding of floor steel bars and formwork support; A5, install and correct the steel columns on the sixth floor of the central building area, and then connect the frame beams between the steel columns. At the same time, install and correct the steel columns on the fourth floor of the overhead platform and the circular building area, and connect the frame beams between the steel columns. Then, tie the steel bars and support the formwork for the sixth floor of the central building area, the fourth floor of the overhead platform, and the fourth floor of the circular building area. A6, steel trusses are set up in the central building area; at the same time, the steel columns from the fifth to the sixth floor of the overhead platform, the frame beams between the steel columns, the floor reinforcement binding and the formwork support are carried out.

[0011] Preferably, the steel truss is specifically constructed as follows: B0, install five tire frames, and multiple tire frames are evenly arranged in the six-story ring-shaped steel structure at the bottom of the central building area, one of the tire frames is in the center, and the other four tire frames are evenly distributed around the tire frame set at the center; B1, install four first trusses, which are connected to the tire frames arranged on the surroundings and the six-story ring steel structure in the central building area; B2, installing the second truss, the second truss is connected to the tire frames arranged on the surroundings and the six-story ring-shaped steel structure on the central floor, and the second truss is perpendicular to the first truss; B3, install the third truss, connect a third truss between two adjacent tire frames, at this time the tire frame located in the center still does not participate in the installation; B4, install the fourth truss and connect the fourth truss between the middle of the third truss and the six-story ring steel structure on the center floor; B5, install the fifth truss, and connect the fifth truss between the middle of the third truss and the tire frame located at the center; B6, post-installation supplementary section; B7, install tie rod; B8, remove the tire frame.

[0012] In the present invention, according to the structural characteristics of the project and the site conditions, the steel structure construction is divided into three construction areas, namely the arc-shaped building area, the central building area and the overhead platform + circular building area. Among them, the arc-shaped building area and the central building area are first constructed alternately. Since the arc-shaped building area has lower floors, the construction will be completed before the central building area. Therefore, after the construction of the arc-shaped building area is completed, the construction of the overhead platform + circular building area will be carried out in time, which saves the construction period and ensures the construction quality.

[0013] During the specific construction, the arc-shaped building area was divided into three areas: A-1, A-2 and A-3, and the central building area was divided into five areas: B-1, B-2, B-3, B-4 and B-5. Because A-3 and B-4 are located in the heart-shaped area, and B-5 is at the root of the slope, the construction progress of these three areas is slower than that of other areas. When constructing the central building area, two teams constructed each floor simultaneously from B-1 and B-2 areas and transferred back to the next area. The construction sequence is reasonable and the construction period is effectively shortened.

[0014] Because part of the steel structure is above the lake surface and there are steel structure pile foundations in the water, and the owner requires to retain the lake water for construction, according to the building characteristics and on-site conditions, the water level is lowered by three meters to build a steel trestle platform, and the construction of steel pipe piles, steel trestle platform and steel structure is carried out in sequence. The steel pipe piles are not only the basic support for the steel structure in the lake, but the steel trestle platform, as a heart-shaped area construction platform, is built on the basis of steel pipe piles. Therefore, the steel pipe piles can also serve as a part of the support of the steel trestle platform, and combined with the reinforced support of the support frame, it is stable, firm and highly safe, which effectively ensures the safety of construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a top view of the overall layout of the present invention; Figure 2 It is a partial top view of the present invention; Figure 3 A top view of the heart-shaped region of the present invention; Figure 4 A top view of the steel trestle platform of the present invention; Figure 5 This is a schematic diagram of the support structure of the present invention; Figure 6 It is a schematic diagram of the structure corresponding to S0 of the present invention; Figure 7 It is a schematic diagram of the structure corresponding to S1 of the present invention; Figure 8 It is a schematic diagram of the structure corresponding to S2 of the present invention; Fig. 9 This is a schematic diagram of the structure corresponding to S3 of the present invention; Fig.10This is a schematic diagram of the structure corresponding to B0 of the present invention; Fig.11 This is a schematic diagram of the structure corresponding to B1 of the present invention; Fig.12 This is a schematic diagram of the structure corresponding to B2 of the present invention; Fig.13 This is a schematic diagram of the structure corresponding to B3 of the present invention; Fig.14 This is a schematic diagram of the structure corresponding to B4 of the present invention; Fig.15 This is a schematic diagram of the structure corresponding to B5 of the present invention; Fig.16 This is a schematic diagram of the structure of the central building area of ​​the present invention after construction; Fig.17 It is a schematic diagram of the tower crane arrangement of the present invention; Fig.18 This is a schematic diagram of the arc-shaped building area and the central building area of ​​the present invention; In the figure: 1. Arc-shaped building area; 2. Central building area; 3. Overhead platform; 4. Circular building area; 5. Steel trestle platform; 6. Support frame; 7. Tyre frame; 8. First truss; 9. Second truss; 10. Third truss; 11. Fourth truss; 12. Fifth truss; 13. 1# tower crane; 14. 1# steel component yard; 15. 2# tower crane; 16. 2# steel component yard; 17. 3# tower crane; 18. 3# steel component yard; 19. 4# tower crane; 20. 4# steel component yard; 21. Steel pipe piles; 50. First installation area; 51. Second installation area; 52. Third installation area; 53. Fourth installation area; 60. Bailey beam; 61. Support column; 62. Support beam; 63. Lakeside retaining wall. DETAILED DESCRIPTION

[0016] The present invention will be further described below in conjunction with the accompanying drawings: like Figures 1 to 18 A construction method for a steel structure with a foundation spanning the boundary between land and water is shown, the steel structure comprising an arc-shaped building area 1, a central building area 2, an overhead platform 3 and a circular building area 4, the arc-shaped building area 1 is connected at the southwest side of the arc-shaped building area 1, the circular building area 4 is connected to the north side of the central building area 2 through the overhead platform 3, the heart-shaped area at the junction of the arc-shaped building area 1 and the central building area 2 is on the lake surface, and the remaining areas are on land.

[0017] The construction method comprises the following steps: Step 1: Determine the construction sequence: construct arc-shaped building area 1, central building area 2, overhead platform 3 and circular building area 4 in sequence; Step 2: Erection of the steel trestle platform 5: The steel trestle platform 5 is divided into a first installation area 50, a second installation area 51, a third installation area 52 and a fourth installation area 53 in the construction sequence from the narrow area to the wide area. The lake level is lowered first, and then the steel pipe pile 21 support frame 6 and the steel trestle platform 5 are constructed simultaneously by fishing method within the lake surface range corresponding to the heart-shaped area; The steel trestle platform 5 includes a first installation area 50, a second installation area 51, a third installation area 52 and a fourth installation area 53; The support frame 6 includes a Bailey beam 60, a support column 61, a support beam 62 and a lakeside retaining wall 63. A plurality of support columns 61 are supported on the lake bottom and are at the same height as the lakeside retaining wall 63. A support beam 62 is arranged on the top of the support column 61 and the top of the lakeside retaining wall 63. A plurality of Bailey beams 60 are arranged on the support beam 62. A first installation area 50, a second installation area 51, a third installation area 52 and a fourth installation area 53 are laid on the Bailey beam 60. The specific steps of fishing method construction are: S0, measuring and laying out, positioning of the steel pipe pile 21, and use of crawler crane to drive the steel pipe pile 21 of the first trestle hole; S1, install steel pipe piles 21, support columns 61, install support beams 62, and hoist Bailey beams 60 as a whole by crawler crane; S2, suspend the Bailey beam 60 forward, set a pile driving guide frame on the Bailey beam 60, lay the first installation area 50, and continue to suspend the support column 61 forward on the crawler crane onto the trestle; S3, repeat S1 and S2 until the fourth installation area 53 is laid; Step 3, tower crane arrangement: install 1# tower crane 13 at the junction of overhead platform 3 and circular building area 4, and install 1# steel component yard 14 in overhead platform 3; install 2# tower crane 15 in the atrium area of ​​central building area 2, and install 2# steel component yard 16 in the area; install 3# tower crane 17 at the edge of central building area 2, and install 3# steel component yard 18 outside central building area 2; install 4# tower crane 19 in the atrium area of ​​arc-shaped building area 1, and install 4# steel component yard 20 in the area; The arc-shaped building area 1 components are stacked in the 4# steel component yard 20 and hoisted by the 1# tower crane 13. The central building area 2 components are stacked in the 2# steel component yard 16 according to the principle of proximity and hoisted by the 2# tower crane 15 or stacked in the 3# steel component yard 18 and hoisted by the 3# tower crane 17. The overhead platform 3 and the circular building area 4 are stacked in the 1# steel component yard 14 and hoisted by the 4# tower crane 19. Step 4: Erection of steel structure: Construction is carried out alternately between the arc-shaped building area 1 and the central building area 2. After the construction of the arc-shaped building area 1 is completed, the central building area 2 and the overhead platform 3 continue to be constructed alternately, while the circular building area 4 and the overhead platform 3 are constructed at the same time, and the heart-shaped area is constructed on the steel trestle platform 5.

[0018] The arc-shaped building area 1 is divided into three areas, A-1, A-2 and A-3. Each floor is constructed in a counterclockwise order starting from A-1. The central building area 2 is divided into five areas, B-1, B-2, B-3, B-4 and B-5. Each floor is constructed from two areas B-1 and B-2 at the same time and then transferred to the next area in reverse order. This order is followed when constructing each floor of the arc-shaped building area 1 and the central building area 2. Specifically: A0, the first floor structure of the arc-shaped building area 1 is a steel-concrete structure. The first-floor steel columns are installed, corrected and grouting is performed twice, and then the first-floor floor reinforcement is tied and the formwork is supported; A1, install and correct the steel columns on the second floor of the curved building area 1, then connect the frame beams between the steel columns, and install and correct the steel columns on the first floor of the central building area 2 at the same time, and perform secondary grouting; then tie the steel bars and support the formwork for the second floor of the curved building area 1 and the first floor of the central building area 2; A2, install and correct the third-floor steel columns of the curved building area 1, and then connect the frame beams between the steel columns. At the same time, install and correct the second-floor steel columns of the central building area 2, and then connect the frame beams between the steel columns. Then tie the steel bars and support the formwork for the third-floor floor of the curved building area 1 and the second-floor floor of the central building area 2. A3, repeat A2 until the reinforcement and formwork support of the fifth floor of the arc-shaped building area 1 and the reinforcement and formwork support of the fourth floor of the central building area 2 are completed; A4, installation and correction of the fifth-floor steel columns of the central building area 2, and then connection of the frame beams between the steel columns, and then binding of the steel bars and formwork support for the fifth-floor floor of the central building area 2; at the same time, connection of the frame beams between the steel columns, binding of the floor steel bars and formwork support for the first to third floors of the overhead platform 3 and the circular building area 4; A5, install and correct the steel columns on the sixth floor of the central building area 2, and then connect the frame beams between the steel columns. At the same time, install and correct the steel columns on the fourth floor of the overhead platform 3 and the circular building area 4, and connect the frame beams between the steel columns; then tie the steel bars and support the formwork for the sixth floor of the central building area 2, the fourth floor of the overhead platform 3, and the fourth floor of the circular building area 4; A6, erect steel trusses in the central building area 2; at the same time, connect the steel columns from the fifth to the sixth floor of the overhead platform 3, connect the frame beams between the steel columns, tie the floor reinforcement and support the formwork.

[0019] The steel truss erection is as follows: B0, five tire frames 7 are installed, and multiple tire frames 7 are evenly arranged in the six-layer annular steel structure at the bottom of the central building area 2, one of the tire frames 7 is at the center, and the other four tire frames 7 are evenly distributed around the tire frame 7 set at the center; B1, install four first trusses 8, the first trusses 8 are connected to the tire frames 7 arranged on the periphery and the six-story annular steel structure of the central building area 2; B2, install the second truss 9, the second truss 9 is connected to the tire frame 7 arranged on the periphery and the six-story ring steel structure on the central floor, and the second truss 9 is perpendicular to the first truss 8; B3, install the third truss 10, connect a third truss 10 between two adjacent tire frames 7, at this time the tire frame 7 located at the center is still not involved in the installation; B4, install the fourth truss 11, and connect the fourth truss 11 between the middle of the third truss 10 and the six-story ring steel structure on the center floor; B5, installing the fifth truss 12, connecting the fifth truss 12 between the middle of the third truss 10 and the tire frame 7 located at the center; B6, post-installation supplementary section; B7, install tie rod; B8, remove tire frame 7.

[0020] The above embodiments are only some illustrations of the concept and implementation of the present invention, and are not intended to limit the same. Under the concept of the present invention, technical solutions that have not been substantially changed are still within the scope of protection.

Claims

1. A construction method for a steel structure with a foundation spanning the boundary between land and water, characterized in that: The steel structure comprises an arc-shaped building area (1), a central building area (2), an overhead platform (3) and a circular building area (4), wherein the arc-shaped building area (1) is connected to the southwest side of the arc-shaped building area (1), and the circular building area (4) is connected to the north side of the central building area (2) through the overhead platform (3). The heart-shaped area at the intersection of the arc-shaped building area (1) and the central building area (2) is on the lake surface, and the remaining area is on land. The construction method comprises the following steps: Step 1: Determine the construction sequence: construct the arc-shaped building area (1), the central building area (2), the overhead platform (3), and the circular building area (4) in sequence; Step 2: erecting the steel trestle platform (5): dividing the steel trestle platform (5) into a first installation area (50), a second installation area (51), a third installation area (52) and a fourth installation area (53) in a construction sequence from a narrow area to a wide area, first lowering the lake surface, and then using the fishing method to simultaneously construct the steel pipe piles (21), the support frame (6) and the steel trestle platform (5) within the lake surface range corresponding to the heart-shaped area; Step 3, tower crane arrangement: a 1# tower crane (13) is arranged at the junction of the overhead platform (3) and the circular building area (4), and a 1# steel component yard (14) is arranged in the overhead platform (3); a 2# tower crane (15) is arranged in the atrium area of ​​the central building area (2), and a 2# steel component yard (16) is arranged in the area; a 3# tower crane (17) is arranged at the edge of the central building area (2), and a 3# steel component yard (18) is arranged outside the central building area (2); a 4# tower crane (19) is arranged in the atrium area of ​​the curved building area (1), and a 4# steel component yard (20) is arranged in the area; Step 4: Erection of steel structure: The arc-shaped building area (1) and the central building area (2) are constructed alternately. After the arc-shaped building area (1) is constructed, the central building area (2) and the overhead platform (3) are constructed alternately, while the circular building area (4) and the overhead platform (3) are constructed simultaneously. The heart-shaped area is constructed on the steel trestle platform (5).

2. The construction method of the steel structure with a foundation spanning the boundary between land and water according to claim 1, characterized in that: In step 1, the arc-shaped building area (1) is divided into three areas A-1, A-2 and A-3, and each floor is constructed in a counterclockwise order starting from A-1; the central building area (2) is divided into five areas B-1, B-2, B-3, B-4 and B-5, and each floor is constructed simultaneously from areas B-1 and B-2 and transferred to the next area in the reverse direction.

3. The construction method of the steel structure with a foundation spanning the boundary between land and water according to claim 1, characterized in that: In step 2, the support frame (6) comprises a Bailey beam (60), a support column (61), a support beam (62) and a lakeside retaining wall (63); a plurality of support columns (61) are supported on the lake bottom and are at the same height as the lakeside retaining wall (63); a support beam (62) is arranged on the top of the support column (61) and the top of the lakeside retaining wall (63); a plurality of Bailey beams (60) are arranged on the support beam (62); and a first installation area (50), a second installation area (51), a third installation area (52) and a fourth installation area (53) are laid on the Bailey beam (60).

4. The construction method of the steel structure with a foundation spanning the boundary between land and water according to claim 3 is characterized by: The steel trestle platform (5) comprises a first installation area (50), a second installation area (51), a third installation area (52) and a fourth installation area (53).

5. The construction method of the steel structure with a foundation spanning the boundary between land and water according to claim 4 is characterized in that: In step 2, the specific steps of the fishing method are as follows: S0, measuring and laying out, positioning of the steel pipe pile (21), and use of a crawler crane to drive the steel pipe pile (21) of the first trestle hole; S1, installing steel pipe piles (21), setting support columns (61), installing support beams (62), and hoisting the Bailey beam (60) as a whole by a crawler crane; S2, suspending the Bailey beam (60) forward, setting a pile driving guide frame on the Bailey beam (60), laying the first installation area (50), and the crawler crane goes up to the trestle and continues to suspend the support column (61) forward; S3, repeat S1 and S2 until the fourth installation area (53) is laid.

6. The construction method of the steel structure with a foundation spanning the boundary between land and water according to claim 1, characterized in that: The components of the curved building area (1) are stacked in the 4# steel component yard (20) and lifted by the 1# tower crane (13). The components of the central building area (2) are stacked in the 2# steel component yard (16) according to the principle of proximity and lifted by the 2# tower crane (15) or stacked in the 3# steel component yard (18) and lifted by the 3# tower crane (17). The overhead platform (3) and the circular building area (4) are stacked in the 1# steel component yard (14) and lifted by the 4# tower crane (19).

7. The construction method of the steel structure with a foundation spanning the boundary between land and water according to claim 6 is characterized by: The step 4 is specifically as follows: A0, curved building area (1) The first floor structure is a steel-concrete structure. The first floor steel columns are installed, corrected and grouted twice, and then the first floor steel bars are tied and the formwork is supported; A1, the second-floor steel columns of the curved building area (1) are installed and corrected, and then the frame beams between the steel columns are connected. At the same time, the first-floor steel columns of the central building area (2) are installed and corrected, and secondary grouting is performed; then the steel bars of the second-floor floor of the curved building area (1) and the first-floor floor of the central building area (2) are tied and the formwork is supported; A2, the third-floor steel columns of the curved building area (1) are installed and corrected, and then the frame beams between the steel columns are connected. At the same time, the second-floor steel columns of the central building area (2) are installed and corrected, and then the frame beams between the steel columns are connected; then the steel bars of the third-floor floor of the curved building area (1) and the second-floor floor of the central building area (2) are tied and the formwork is supported; A3, repeat A2 until the fifth-floor steel bar binding and formwork support of the curved building area (1) and the fourth-floor steel bar binding and formwork support of the central building area (2) are completed; A4, installation and correction of the five-story steel columns of the central building area (2), connection of the frame beams between the steel columns, and binding of the steel bars and formwork support for the five-story floor of the central building area (2); at the same time, connection of the steel columns from the first to the third floor of the overhead platform (3) and the circular building area (4), connection of the frame beams between the steel columns, binding of the floor steel bars and formwork support; A5, install and correct the steel columns on the sixth floor of the central building area (2), then connect the frame beams between the steel columns, and simultaneously install and correct the steel columns on the fourth floor of the overhead platform (3) and the circular building area (4), and connect the frame beams between the steel columns; then tie the steel bars and support the formwork for the sixth floor of the central building area (2), the fourth floor of the overhead platform (3), and the fourth floor of the circular building area (4); A6, the central building area (2) erects steel trusses; at the same time, the overhead platform (3) connects the fifth to sixth floor steel columns, the frame beams between the steel columns, and the floor reinforcement is tied and the formwork is supported.

8. The construction method of the steel structure with a foundation spanning the boundary between land and water according to claim 7 is characterized by: The steel truss is specifically constructed as follows: B0, five tire frames (7) are installed, and the multiple tire frames (7) are evenly arranged in the six-layer annular steel structure at the bottom of the central building area (2), one of the tire frames (7) is at the center, and the other four tire frames (7) are evenly distributed around the tire frame (7) set at the center; B1, installing four first trusses (8), wherein the first trusses (8) are connected to the tire frames (7) arranged on the periphery and the six-story annular steel structure of the central building area (2); B2, installing a second truss (9), the second truss (9) being connected to the tire frames (7) arranged on the periphery and the six-story annular steel structure on the central floor, and the second truss (9) being perpendicular to the first truss (8); B3, installing the third truss (10), connecting a third truss (10) between two adjacent tire frames (7), at this time, the tire frame (7) located at the center is still not involved in the installation; B4, installing the fourth truss (11), connecting the fourth truss (11) between the middle of the third truss (10) and the six-story ring steel structure on the center floor; B5, installing the fifth truss (12), connecting the fifth truss (12) between the middle of the third truss (10) and the tire frame (7) located at the center; B6, post-installation supplementary section; B7, install tie rod; B8, remove the tire frame (7).

Images