Large-span variable-curvature truss-type multi-dome steel structure roof and construction method thereof

Abstract

This invention discloses a large-span, variable curvature truss-type multi-dome steel structure roof and its construction method. The roof comprises a first dome, a second dome, and a third dome; planar support trusses connecting each pair of the three domes; triangular support trusses connecting the intersections of the tops of the three domes; annular support trusses connecting each pair of the three domes; and an outer ring truss connecting the outer peripheries of the first, second, and third domes. The truss design of the three dome structures in a triangular shape improves the overall structural strength and aesthetics of the roof. The planar support trusses, triangular support trusses, and annular support trusses enhance the structural strength of each dome and connect the three dome structures, strengthening their overall integrity. Two construction plans are implemented based on the civil engineering schedule, ensuring both construction time and structural stress during installation. This allows for adaptation to different on-site construction conditions.

Description

Technical Field

[0001] This invention relates to the field of steel structure roofing technology, and in particular to a large-span variable curvature truss multi-dome steel structure roof and its construction method. Background Technology

[0002] Steel structures are widely used due to their advantages such as strong load-bearing capacity, convenient construction, and large spans. In the construction of venues such as exhibition halls, stadiums, and shopping malls, steel structures are often designed in irregular shapes to meet both functional and aesthetic requirements. Existing dome structures are mostly single circular or irregular shapes, lacking design and installation solutions for multi-dome steel structures. Furthermore, there is a lack of relevant technology regarding the connection between multiple domes and installation schemes under different working conditions, thus necessitating targeted design. Summary of the Invention

[0003] This invention provides a large-span variable curvature truss multi-dome steel structure roof and its construction method, which solves the technical problems of multi-dome structure design, connection and installation, and installation and construction under different working conditions.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A large-span variable curvature truss-type multi-dome steel structure roof includes a first dome, a second dome, and a third dome arranged in a triangular pattern; a set of planar support trusses connecting the first and second domes, the second and third domes, and the third dome and the first dome; a triangular support truss connecting the tops of the first, second, and third domes; an annular support truss connecting the first and second domes, the second and third domes, and the third dome and the first dome; and an outer ring truss connecting the outer periphery of the first, second, and third domes. The first dome, the second dome, and the third dome are all composed of trusses, and all three are arranged in a fan-shaped or shell-like manner; all three are arc-shaped from bottom to top, with the inclination at the top being greater than that at the bottom; A "V"-shaped gap is set at the junction of the first, second, and third domes. Circular support trusses are set at the three ends of the gap, and planar support trusses are set at intervals on the gap. A triangular support truss is set at the midpoint of the "V". The three corners of the triangular support truss are connected to the first dome, the second dome, and the third dome, respectively. The annular support truss includes an annular main truss, annular connecting trusses sequentially connecting the inner trusses of the first, second, or third dome, and annular radially outward connecting trusses connecting the annular main truss, the annular connecting trusses, and the outer annular belt trusses; its In the middle, the ring-shaped main truss is arranged in a ring shape and is tangentially connected to the adjacent planar support truss.

[0005] Furthermore, the first dome includes a first main truss, first radial trusses spaced along the length of the first main truss, and a first transverse truss perpendicularly connected to the first radial truss and connected inside the first main truss; wherein, the extended ends of the first radial trusses are connected to the outer ring truss. The second dome includes a second main truss, second radial trusses spaced along the length of the second main truss, and a second transverse truss perpendicularly connected to the second radial trusses and connected inside the second main truss; wherein the extended ends of the second radial trusses are connected to the outer ring trusses. The third dome includes a third main truss, third radial trusses spaced along the length of the third main truss, and a third transverse truss perpendicularly connected to the third radial truss and connected inside the third truss; wherein the extended ends of the first radial truss are connected to the outer ring truss.

[0006] Furthermore, the first main truss, the second main truss, and the third main truss all include the main truss upper chord, the main truss lower chord, the main truss vertical web members, and the main truss diagonal web members; The upper chord of the main truss is an Ω-shaped arc member in both the vertical and horizontal directions; the lower chord of the main truss is set directly below the upper chord, and its upper chord is also an Ω-shaped arc member in both the vertical and horizontal directions; vertical web members and diagonal web members of the main truss are set at intervals between the upper chord and the lower chord of the main truss, and the upper chord and the lower chord of the main truss are widened at the arching point.

[0007] Furthermore, the first radial truss, the second radial truss, and the third radial truss all include radial truss upper chord, radial truss lower chord, radial truss vertical web members, and radial truss diagonal web members; The upper chord of the radial truss is an upward-curving arc-shaped member; the lower chord of the radial truss is an L-shaped member located directly below the upper chord of the radial truss, with an arc-shaped setting at its corner, and the vertical distance between the lower chord and the upper chord of the radial truss is widened at the corner. Vertical web members and diagonal web members of the truss are installed at intervals between the lower chord and the upper chord of the truss.

[0008] Furthermore, the first transverse truss, the second transverse truss, and the third transverse truss all include a transverse truss upper chord, a transverse truss lower chord, a transverse truss vertical web member, and a transverse truss diagonal web member; The upper chord of the horizontal truss is an arc-shaped member that bends downward at the center and curves upward at both ends, while the lower chord of the horizontal truss is an arc-shaped member that curves upward at the center and downward at both ends. The lower chord of the horizontal truss is located directly below the upper chord of the horizontal truss, and vertical web members and diagonal web members of the horizontal truss are arranged between the two at intervals.

[0009] Furthermore, the planar support truss is connected to the lower chord of the radial truss and the upper chord of the radial truss at the connection points of the lower chord of the main truss and the upper chord of the main truss, respectively; The upper chord of the planar support truss is connected to the upper chord of the main truss and to the upper chord of the adjacent radial truss, and its lower chord is connected to the lower chord of the main truss and to the lower chord of the adjacent radial truss; vertical web members and diagonal web members are connected between the lower chord and the upper chord; wherein, the upper chord and the lower chord are straight members.

[0010] Furthermore, the triangular support truss includes an upper chord, a lower chord, and diagonal web members between the upper and lower chords; Among them, the upper chord and the lower chord are straight bars. The upper chord is connected to the upper chord of the adjacent main truss and is located at the connection between the upper chord of the main truss and the upper chord of the radial truss. The lower chord is connected to the adjacent lower chord of the main truss and is located at the connection between the lower chord of the main truss and the lower chord of the radial truss.

[0011] Furthermore, the annular main truss, the annular butt truss, and the annular radial outward connecting truss all include their respective upper chord, lower chord, and diagonal web members connecting the upper and lower chords; Among them, the upper and lower chords of the ring-shaped main truss are arranged in a ring shape and are tangentially connected to the upper and lower chords of the planar support truss; The upper and lower chords of the ring-connected truss are arranged in an arc shape, and are respectively connected to the upper and lower chords of the adjacent transverse trusses.

[0012] Furthermore, the outer ring truss is a zigzag ring shape, which includes an upper chord, a lower chord, and diagonal and vertical web members connecting the upper and lower chords; the upper and lower chords are designed to be zigzag rings and are correspondingly connected to the upper and lower chords of the radial truss.

[0013] Furthermore, the construction method for a large-span, variable-curvature truss multi-dome steel structure roof is as follows: Step 1: The civil engineering structure at the intersection of the first and second domes is under construction. Installation begins with the third dome. Columns and supports are installed at the column placement points, and temporary support frames are installed. The outer ring trusses at both ends of the third dome are constructed first, followed by the third main truss and the plane support trusses at both ends. Step 2: Simultaneously construct the first and second main trusses of the adjacent sections of the third dome; install the triangular support trusses at the intersection of the first, second, and third main trusses; Step 3: Install the third radial truss and the third transverse truss inside the third dome, as well as the corresponding annular support trusses at both ends of the third dome. Step 4: When the construction of the civil engineering structure at the intersection reaches the working surface at or earlier than the design time, complete the installation of the remaining parts of the first and second main trusses, and connect the planar support trusses between the first and second main trusses in sequence and simultaneously; form a connected whole by enclosing the outer ring trusses; at this time, unload the original jigs and unload the remaining support jigs onto the first, second, and third main trusses; Step 5: Then, install the annular support truss between the first dome and the second dome, and simultaneously install the first radial truss and the first transverse truss inside the first dome, and simultaneously install the second radial truss and the second transverse truss inside the second dome, until the large-span variable curvature truss multi-dome steel structure roof is completed. Step 6: If the construction of the civil engineering structure at the intersection is delayed beyond the design time, then during the construction of the third radial truss and the third transverse truss in Step 3, the first radial truss and the first transverse truss within the first dome shall be constructed simultaneously, and the second radial truss and the second transverse truss within the second dome shall be constructed simultaneously. Step 7: After the remaining civil engineering structure is completed, complete the first main truss, the second main truss, and the outer ring truss to form a connected whole; Step 8: Then, install the annular support truss between the first dome and the second dome, install the remaining first radial truss and first transverse truss in the first dome, and simultaneously install the remaining second radial truss and second transverse truss in the second dome until the large-span variable curvature truss multi-dome steel structure roof is completed as a whole, and then unload and install the jig as a whole.

[0014] The beneficial effects of this invention are reflected in: This invention utilizes a truss design with three dome structures arranged in a triangular pattern, which improves the overall structural integrity and aesthetics of the roof. The design incorporates planar, triangular, and circular support trusses, enhancing the load-bearing capacity of each structure and allowing for interconnection and improved overall structural integrity. Two construction plans are implemented to ensure both timely construction and adequate structural support during installation, addressing various on-site construction conditions. Therefore, this application solves the technical problems of designing, connecting, and installing multi-dome structures under different conditions. Other features and advantages of this invention will be set forth in the following description and will be apparent in part from the description, or may be learned by practicing the invention; the main objectives and other advantages of this invention may be realized and obtained by means of the methods particularly pointed out in the description. Attached Figure Description

[0015] Figure 1 This is a three-dimensional schematic diagram of a large-span, variable-curvature truss-type multi-dome steel structure roof. Figure 1 ; Figure 2 This is a three-dimensional schematic diagram of a large-span, variable-curvature truss-type multi-dome steel structure roof. Figure 2 ; Figure 3 This is a schematic diagram of the column placement locations; Figure 4 This is a schematic diagram of a large-span, variable curvature truss-type multi-dome steel structure roof. Figure 5 This is a schematic diagram of the main truss structure; Figure 6 This is a schematic diagram of a radial truss structure; Figure 7 This is a schematic diagram of a transverse truss structure; Figure 8 This is a construction diagram of part of the outer ring truss, the third main truss and its adjacent structures; Figure 9 This is a construction diagram of a planar support truss and its adjacent structures. Figure 1 ; Figure 10 This is a construction diagram of the third radial truss, the third transverse truss, the annular support truss, and their adjacent structures; Figure 11 This is a construction diagram showing the enclosed construction of the remaining first main truss, the first main truss, and the outer ring truss. This is to ensure that the designed civil structure is completed on time or ahead of schedule. Figure 12 This is a schematic diagram of the construction and installation of the second radial truss, the second transverse truss, the third radial truss, and the third transverse truss; this is to ensure that the designed civil structure is completed on time or ahead of schedule. Figure 13 This is a schematic diagram showing the completed construction of a large-span, variable curvature truss-type multi-dome steel structure roof; this is a civil engineering structure that was completed on time or ahead of schedule. Figure 14 This is a construction diagram of a planar support truss and its adjacent structures. Figure 2 ; Figure 15 This is a schematic diagram of the construction and installation of the third radial truss, the third transverse truss, the ring support truss, the second radial truss, the second transverse truss, the third radial truss, and the third transverse truss, and their corresponding structures; this is after the completion time of the designed civil engineering structure; Figure 16 This is a completed drawing of the roof structure construction and installation, excluding the unfinished civil engineering work; this is later than the design completion time of the civil engineering structure. Figure 17 This is a schematic diagram showing the construction of the remaining first main truss, the first main truss, and the outer ring truss; this is after the completion time of the designed civil engineering structure; Figure 18 This is a schematic diagram showing the completed construction of a large-span, variable-curvature truss-type multi-dome steel structure roof; this is later than the completion time of the designed civil engineering structure.

[0016] Figure reference numerals: 1-First dome, 11-First main truss, 12-First radial truss, 13-First transverse truss, 2-Second dome, 21-Second main truss, 22-Second radial truss, 23-Second transverse truss, 3-Third dome, 31-Third main truss, 32-Third radial truss, 33-Third transverse truss, 4-Plane support truss, 5-Triangular support truss, 6-Ring support truss, 61-Ring main truss, 62-Ring connecting truss, 63- 7-Outer ring truss, 8-Column placement point, 9-Civil structure, 101-Main truss upper chord, 102-Main truss lower chord, 103-Main truss vertical web member, 104-Main truss diagonal web member, 201-Radial truss upper chord, 202-Radial truss lower chord, 203-Radial truss vertical web member, 204-Radial truss diagonal web member, 301-Horizontal truss upper chord, 302-Horizontal truss lower chord, 303-Horizontal truss vertical web member, 304-Diagonal web member. Detailed Implementation

[0017] The technical solutions of the present invention will be described in detail below through embodiments. The following embodiments are merely exemplary and can only be used to explain and illustrate the technical solutions of the present invention, and should not be construed as limiting the technical solutions of the present invention.

[0018] Taking a high-speed rail area project as an example, the construction project includes two super high-rise towers, a commercial podium, and an underground parking garage. The commercial podium has five floors above ground and a multi-dome design. The roof structure is at an elevation of 31.05m, and the dome support structure is at an elevation of 32.05m. The structure is a tubular truss structure, with a maximum span of 113.2m. The dome construction adopted a "scaffolding support + high-altitude assembly" construction process. The scaffolding was erected on the fourth floor of the podium at an elevation of 24.55m, with a support height of 8.4m-17.8m. The installation was mainly carried out using tower cranes and 8t truck cranes, with straight boom cranes, articulated boom cranes, and scissor cranes used for installation, welding, rust removal, and painting on the floor.

[0019] like Figures 1 to 8 As shown, the large-span variable curvature truss-type multi-dome steel structure roof includes a first dome 1, a second dome 2, and a third dome 3 arranged in a triangular shape; a set of planar support trusses 4 connecting the first dome 1 and the second dome 2, the second dome 2 and the third dome 3, and the third dome 3 and the first dome 1; a triangular support truss 5 connecting the tops of the first dome 1, the second dome 2, and the third dome 3; an annular support truss 6 connecting the first dome 1 and the second dome 2, the second dome 2 and the third dome 3, and the third dome 3 and the first dome 1; and an outer ring truss 7 connecting the outer periphery of the first dome 1, the second dome 2, and the third dome 3. The first dome 1, the second dome 2, and the third dome 3 are all composed of trusses, and all three are arranged in a fan-shaped or shell-like manner; all three are arc-shaped from bottom to top, with the slope at the top being greater than that at the bottom. A "V"-shaped gap is provided at the junction of the first dome 1, the second dome 2 and the third dome 3. A ring-shaped support truss 6 is provided at the three ends of the gap. Planar support trusses 4 are provided at intervals on the gap. A triangular support truss 5 is provided at the midpoint of the "V". Among them, the three corners of the triangular support truss 5 are connected to the first dome 1, the second dome 2 and the third dome 3 respectively; The annular support truss 6 includes an annular main truss 61, an annular connecting truss 62 that sequentially connects the inner trusses of the first dome 1, the second dome 2, or the third dome 3, and an annular radially outward connecting truss 63 that connects the annular main truss 61, the annular connecting truss 62, and the outer annular belt truss 7; wherein, the annular main truss 61 is arranged in an annular shape and is tangentially connected to the adjacent planar support truss 4.

[0020] In this embodiment, the first dome 1 includes a first main truss 11, first radial trusses 12 spaced along the length of the first main truss 11, and a first transverse truss 13 perpendicularly connected to the first radial trusses 12 and connected inside the first main truss 11; wherein, the extended ends of the first radial trusses 12 are connected to the outer ring truss 7; the second dome 2 includes a second main truss 21, second radial trusses 22 spaced along the length of the second main truss 21, and a second transverse truss 23 perpendicularly connected to the second radial trusses 22 and connected inside the second main truss 21; wherein, the extended ends of the second radial trusses 22 are connected to the outer ring truss 7; The third dome 3 includes a third main truss 31, a third radial truss 32 spaced along the length of the third main truss 31, and a third transverse truss 33 perpendicularly connected to the third radial truss 32 and connected inside the third truss; wherein, the outward end of the first radial truss 12 is connected to the outer ring truss 7.

[0021] In this embodiment, the first main truss 11, the second main truss 21, and the third main truss 31 all include a main truss upper chord 101, a main truss lower chord 102, a main truss vertical web member 103, and a main truss diagonal web member 304104; the main truss upper chord 101 is an Ω-shaped arc member in both the vertical and horizontal directions; the main truss lower chord 102 is located directly below the upper chord, and its upper chord is an Ω-shaped arc member in both the vertical and horizontal directions; the main truss vertical web member 103 and the main truss diagonal web member 304104 are spaced apart between the main truss upper chord 101 and the main truss lower chord 102, and the main truss upper chord 101 and the main truss lower chord 102 are widened at the arching point.

[0022] In this embodiment, the first radial truss 12, the second radial truss 22, and the third radial truss 32 all include a radial truss upper chord 201, a radial truss lower chord 202, a radial truss vertical web member 203, and a radial truss diagonal web member 304204. The radial truss upper chord 201 is an upwardly curved arc-shaped member. The radial truss lower chord 202 is an L-shaped member located directly below the radial truss upper chord 201, with an arc-shaped corner. The vertical distance between the radial truss lower chord 202 and the radial truss upper chord 201 is widened at the corner. The radial truss vertical web member 203 and the radial truss diagonal web member 304204 are spaced apart between the radial truss lower chord 202 and the radial truss upper chord 201.

[0023] In this embodiment, the first transverse truss 13, the second transverse truss 23, and the third transverse truss 33 all include a transverse truss upper chord 301, a transverse truss lower chord 302, a transverse truss vertical web member 303, and a transverse web member 304. The transverse truss upper chord 301 is an arc-shaped member that bends downward at the center and curves upward at both ends, and the transverse truss lower chord 302 is an arc-shaped member that curves upward at the center and downward at both ends. The transverse truss lower chord 302 is located directly below the transverse truss upper chord 301, and the transverse truss vertical web member 303 and the transverse web member 304 are spaced apart between them.

[0024] In this embodiment, the planar support truss 4 is connected to the lower chord 202 and the upper chord 201 of the radial truss at the connection points of the lower chord 102 and the upper chord 101 of the main truss, respectively. The upper chord of the planar support truss 4 is connected to the upper chord 101 of the main truss and to the adjacent upper chord 201 of the radial truss, and its lower chord is connected to the lower chord 102 of the main truss and to the adjacent lower chord 202 of the radial truss. Vertical web members and diagonal web members 304 are connected between the lower chord and the upper chord. The upper chord and the lower chord are straight members.

[0025] In this embodiment, The triangular support truss 5 includes an upper chord, a lower chord, and a diagonal web member 304 between the upper and lower chords; wherein, the upper and lower chords are straight members, the upper chord is connected to the adjacent upper chord 101 of the main truss and is located at the connection between the upper chord 101 of the main truss and the upper chord 201 of the radial truss; the lower chord is connected to the adjacent lower chord 102 of the main truss and is located at the connection between the lower chord 102 of the main truss and the lower chord 202 of the radial truss.

[0026] In this embodiment, the annular main truss 61, the annular connecting truss 62, and the annular radially outward connecting truss 63 each include their own upper chord, lower chord, and diagonal web members 304 connecting the upper and lower chords; wherein, the upper and lower chords of the annular main truss 61 are arranged in annular shape and are tangentially connected to the upper and lower chords of the planar support truss 4; the upper and lower chords of the annular connecting truss 62 are arranged in arc shape and are respectively sequentially connected to the adjacent upper chord 301 and lower chord 302 of the transverse truss.

[0027] In this embodiment, the outer ring truss 7 is a broken ring shape, which includes an upper chord, a lower chord, and diagonal web members 304 and vertical web members connecting the upper and lower chords; the upper and lower chords are designed to be broken ring shapes and are correspondingly connected to the radial truss upper chord 201 and radial truss lower chord 202.

[0028] Combination Figures 1 to 18 As shown, the construction method for a large-span, variable curvature truss-type multi-dome steel structure roof is further explained. The specific steps are as follows: Step 1: The civil structure 9 at the intersection of the first dome 1 and the second dome 2 is under construction. Installation begins with the third dome 3. Columns and supports are installed at column placement points 8, and temporary support frames are installed. The outer ring trusses 7 corresponding to both ends of the third dome 3 are constructed first, followed by the construction of the third main truss 31 and the two end planar support trusses 4.

[0029] Step 2: Simultaneously construct the first main truss 11 and the second main truss 21 of the adjacent parts of the third dome 3; install the triangular support truss 5 at the intersection of the first main truss 11, the second main truss 21 and the third main truss 31.

[0030] Step 3: Install the third radial truss 32 and the third transverse truss 33 inside the third dome 3, as well as the corresponding annular support trusses 6 at both ends of the third dome 3.

[0031] Step 4: When the construction of the civil structure 9 at the intersection is completed at or earlier than the design time, the remaining parts of the first main truss 11 and the second main truss 21 are installed, and the planar support truss 4 between the first main truss 11 and the second main truss 21 is connected in sequence and synchronously; the outer ring truss 7 is used to enclose and form a connected whole; at this time, the original jig is unloaded, and the remaining jigs are unloaded onto the first main truss 11, the second main truss 21 and the third main truss 31.

[0032] Step 5: Then, install the annular support truss 6 between the first dome 1 and the second dome 2, and simultaneously install the first radial truss 12 and the first transverse truss 13 in the first dome 1, and simultaneously install the second radial truss 22 and the second transverse truss 23 in the second dome 2, until the large-span variable curvature truss multi-dome steel structure roof is completed.

[0033] Step 6: If the construction of the civil structure 9 at the intersection is delayed beyond the design time, then during the construction of the third radial truss 32 and the third transverse truss 33 in step 3, the first radial truss 12 and the first transverse truss 13 in the first dome 1 are constructed simultaneously, and the second radial truss 22 and the second transverse truss 23 in the second dome 2 are constructed simultaneously. Step 7: After the remaining civil engineering structure 9 is completed, the first main truss 11, the second main truss 21 and the outer ring truss 7 are added to form a connected whole.

[0034] Step 8: Then, install the annular support truss 6 between the first dome 1 and the second dome 2, install the remaining first radial truss 12 and first transverse truss 13 in the first dome 1, and simultaneously install the remaining second radial truss 22 and second transverse truss 23 in the second dome 2 until the large-span variable curvature truss multi-dome steel structure roof is completed, and then unload and install the jig as a whole.

[0035] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A large-span, variable curvature truss-type multi-dome steel structure roof, characterized in that, It includes a first dome, a second dome, and a third dome arranged in a triangular shape; a set of planar support trusses connecting the first and second domes, the second and third domes, and the third dome and the first dome; a triangular support truss connecting the tops of the first, second, and third domes; an annular support truss connecting the first and second domes, the second and third domes, and the third dome and the first dome; and an outer ring truss connecting the outer periphery of the first, second, and third domes. The first dome, the second dome, and the third dome are all composed of trusses, and all three are arranged in a fan-shaped or shell-like manner; all three are arc-shaped from bottom to top, with the inclination at the top being greater than that at the bottom; A "V"-shaped gap is set at the junction of the first, second, and third domes. Circular support trusses are set at the three ends of the gap, and planar support trusses are set at intervals on the gap. A triangular support truss is set at the midpoint of the "V". The three corners of the triangular support truss are connected to the first dome, the second dome, and the third dome, respectively. The annular support truss includes an annular main truss, annular connecting trusses sequentially connecting the inner trusses of the first, second, or third dome, and annular radially outward connecting trusses connecting the annular main truss, the annular connecting trusses, and the outer annular belt trusses; its In the middle, the ring-shaped main truss is arranged in a ring shape and is tangentially connected to the adjacent planar support truss.

2. The large-span, variable curvature truss-type multi-dome steel structure roof as described in claim 1, characterized in that, The first dome includes a first main truss, first radial trusses spaced along the length of the first main truss, and a first transverse truss perpendicularly connected to the first radial trusses and connected inside the first main truss; wherein, the extended ends of the first radial trusses are connected to the outer ring trusses. The second dome includes a second main truss, second radial trusses spaced along the length of the second main truss, and a second transverse truss perpendicularly connected to the second radial trusses and connected inside the second main truss; wherein the extended ends of the second radial trusses are connected to the outer ring trusses. The third dome includes a third main truss, third radial trusses spaced along the length of the third main truss, and a third transverse truss perpendicularly connected to the third radial truss and connected inside the third truss; wherein the extended ends of the first radial truss are connected to the outer ring truss.

3. The large-span variable curvature truss multi-dome steel structure roof as described in claim 2, characterized in that, The first main truss, the second main truss, and the third main truss all include the main truss upper chord, the main truss lower chord, the main truss vertical web members, and the main truss diagonal web members. The upper chord of the main truss is an Ω-shaped arc member in both the vertical and horizontal directions; the lower chord of the main truss is set directly below the upper chord, and its upper chord is also an Ω-shaped arc member in both the vertical and horizontal directions; vertical web members and diagonal web members of the main truss are set at intervals between the upper chord and the lower chord of the main truss, and the upper chord and the lower chord of the main truss are widened at the arching point.

4. The large-span variable curvature truss multi-dome steel structure roof as described in claim 3, characterized in that, The first radial truss, the second radial truss, and the third radial truss all include radial truss upper chord, radial truss lower chord, radial truss vertical web members, and radial truss diagonal web members; The upper chord of the radial truss is an upward-curving arc-shaped member; the lower chord of the radial truss is an L-shaped member located directly below the upper chord of the radial truss, with an arc-shaped setting at its corner, and the vertical distance between the lower chord and the upper chord of the radial truss is widened at the corner. Vertical web members and diagonal web members of the truss are provided at intervals between the lower chord and the upper chord of the truss.

5. A large-span, variable curvature truss-type multi-dome steel structure roof as described in claim 4, characterized in that, The first transverse truss, the second transverse truss, and the third transverse truss all include a transverse truss upper chord, a transverse truss lower chord, a transverse truss vertical web member, and a transverse truss diagonal web member; The upper chord of the horizontal truss is an arc-shaped member that bends downward at the center and curves upward at both ends, while the lower chord of the horizontal truss is an arc-shaped member that curves upward at the center and downward at both ends. The lower chord of the horizontal truss is located directly below the upper chord of the horizontal truss, and vertical web members and diagonal web members of the horizontal truss are arranged between the two at intervals.

6. The large-span, variable curvature truss-type multi-dome steel structure roof as described in claim 5, characterized in that, The planar support truss is connected to the lower chord of the radial truss and the upper chord of the radial truss at the connection points of the lower chord of the main truss and the upper chord of the main truss, respectively; The upper chord of the planar support truss is connected to the upper chord of the main truss and to the upper chord of the adjacent radial truss, and its lower chord is connected to the lower chord of the main truss and to the lower chord of the adjacent radial truss; vertical web members and diagonal web members are connected between the lower chord and the upper chord; wherein, the upper chord and the lower chord are straight members.

7. A large-span, variable curvature truss-type multi-dome steel structure roof as described in claim 6, characterized in that, A triangular bracing truss includes an upper chord, a lower chord, and diagonal web members between the upper and lower chords; Among them, the upper chord and the lower chord are straight bars. The upper chord is connected to the upper chord of the adjacent main truss and is located at the connection between the upper chord of the main truss and the upper chord of the radial truss. The lower chord is connected to the adjacent lower chord of the main truss and is located at the connection between the lower chord of the main truss and the lower chord of the radial truss.

8. A large-span, variable curvature truss-type multi-dome steel structure roof as described in claim 7, characterized in that, The annular main truss, the annular butt truss, and the annular radially outward connecting truss all include their respective upper chord, lower chord, and diagonal web members connecting the upper and lower chords. Among them, the upper and lower chords of the ring-shaped main truss are arranged in a ring shape and are tangentially connected to the upper and lower chords of the planar support truss; The upper and lower chords of the ring-connected truss are arranged in an arc shape, and are respectively connected to the upper and lower chords of the adjacent transverse trusses.

9. A large-span, variable curvature truss-type multi-dome steel structure roof as described in claim 8, characterized in that, The outer ring truss is a broken ring shape, which includes an upper chord, a lower chord, and diagonal and vertical web members connecting the upper and lower chords; the upper and lower chords are designed to be broken ring shapes and are connected to the upper and lower chords of the radial truss.

10. A construction method for a large-span, variable curvature truss-type multi-dome steel structure roof as described in claim 9, characterized in that, The specific steps are as follows: Step 1: The civil engineering structure at the intersection of the first and second domes is under construction. Installation begins with the third dome. Columns and supports are installed at the column placement points, and temporary support frames are installed. The outer ring trusses at both ends of the third dome are constructed first, followed by the third main truss and the plane support trusses at both ends. Step 2: Simultaneously construct the first and second main trusses of the adjacent sections of the third dome; install the triangular support trusses at the intersection of the first, second, and third main trusses; Step 3: Install the third radial truss and the third transverse truss inside the third dome, as well as the corresponding annular support trusses at both ends of the third dome. Step 4: When the construction of the civil engineering structure at the intersection reaches the working surface at or earlier than the design time, complete the installation of the remaining parts of the first and second main trusses, and connect the planar support trusses between the first and second main trusses in sequence and simultaneously; form a connected whole by enclosing the outer ring trusses; at this time, unload the original jigs and unload the remaining support jigs onto the first, second, and third main trusses; Step 5: Then, install the annular support truss between the first dome and the second dome, and simultaneously install the first radial truss and the first transverse truss inside the first dome, and simultaneously install the second radial truss and the second transverse truss inside the second dome, until the large-span variable curvature truss multi-dome steel structure roof is completed. Step 6: If the construction of the civil engineering structure at the intersection is delayed beyond the design time, then during the construction of the third radial truss and the third transverse truss in Step 3, the first radial truss and the first transverse truss within the first dome shall be constructed simultaneously, and the second radial truss and the second transverse truss within the second dome shall be constructed simultaneously. Step 7: After the remaining civil engineering structure is completed, complete the first main truss, the second main truss, and the outer ring truss to form a connected whole; Step 8: Then, install the annular support truss between the first dome and the second dome, install the remaining first radial truss and first transverse truss in the first dome, and simultaneously install the remaining second radial truss and second transverse truss in the second dome until the large-span variable curvature truss multi-dome steel structure roof is completed as a whole, and then unload and install the jig as a whole.

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