Truss grid folded plate concrete composite shell roof structure and construction method

Abstract

The application discloses a truss grid folded plate concrete combined shell roof structure and a construction method, and belongs to the technical field of building engineering. The structure comprises a truss grid shell and a folded plate concrete shell. The truss grid shell comprises radial folded line trusses and annular polygonal trusses. The radial folded line trusses are arranged radially with the center of the top of the shell as a midpoint, and form radial ridge lines of the truss grid shell. The annular polygonal trusses are arranged annularly with the center of the top of the shell as a midpoint, and form annular ridge lines of the truss grid shell. At least one of the arrangement modes of the radial ridge lines and the annular ridge lines of the truss grid shell and the folded plate concrete shell is staggered arrangement. The radial folded line trusses and / or the annular polygonal trusses are located in the middle of the plane concrete slab, can effectively reduce the span of the plane concrete slab and improve the out-of-plane bending resistance of the plane concrete slab under the condition that the grid size is unchanged, and thus the load bearing performance of the structure is improved.

Description

Technical Field

[0001] This invention relates to the field of building engineering technology, and in particular to a truss grid folded plate concrete composite shell roof structure and its construction method. Background Technology

[0002] Shell roof structures, as one of the earliest and most widely used forms of large-span spatial structures, fully utilize the compressive strength of materials by converting external loads into membrane pressure within the shell. They offer significant advantages such as high material utilization, high stiffness, excellent spatial load-bearing capacity, strong spanning ability, and flexible design. Traditional shell structures mainly include two types: concrete thin-shell structures and steel mesh shell structures. Each has its drawbacks: concrete thin-shell structures are heavy, have complex formwork, long cast-in-place construction periods, and high costs; while steel mesh shell structures suffer from poor corrosion and fire resistance, high maintenance costs, and relatively low stiffness.

[0003] To combine the advantages of both steel and concrete, steel-concrete composite shell roof structures have gradually developed. This structural system integrates the advantages of convenient construction of steel grid shells and the high rigidity and durability of thin concrete shells, overcoming to some extent the problems of low construction efficiency of traditional concrete shells and high maintenance costs of steel grid shells. However, existing steel-concrete composite shells still mostly adopt curved surface structures, leading to difficulties in the fabrication of curved concrete formwork and high processing costs for curved steel components. In actual construction, they still face challenges such as complex component forming processes and poor economic efficiency.

[0004] To address the aforementioned issues, existing technologies have proposed a "straight-line substitution" construction strategy. This involves using a grid of straight steel components as boundaries, laying flat concrete slabs on top, and approximating the curved surface shape through folded plate combinations. While this method significantly reduces the fabrication difficulty of curved components, it still has significant drawbacks: when the steel grid (including radial and circumferential components) is large, the out-of-plane bending stiffness of the flat concrete slab is insufficient, leading to a decrease in the overall load-bearing capacity of the roof; conversely, reducing the grid size to meet stiffness and load-bearing capacity requirements results in a substantial increase in the amount of steel components and nodes used, significantly increasing steel consumption and reducing economic efficiency.

[0005] Therefore, how to effectively improve the stiffness and load-bearing capacity of the folded plate composite shell while retaining the advantages of the "straight instead of curved" technology, and at the same time control the amount of steel used and improve economic efficiency, has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0006] The purpose of this invention is to provide a truss grid folded plate concrete composite shell roof structure and construction method to solve the problems existing in the prior art. Among the radial ridge arrangement and the circumferential ridge arrangement, at least one arrangement is an alternating arrangement, so that the radial folded truss and / or the circumferential polygonal truss are located in the middle of the planar concrete slab. This can effectively reduce the span of the planar concrete slab and improve the out-of-plane bending resistance of the planar concrete slab without changing the grid size, thereby improving the structural bearing capacity.

[0007] To achieve the above objectives, the present invention provides the following solution:

[0008] This invention provides a truss grid folded plate concrete composite shell roof structure, comprising a truss grid shell and a folded plate concrete shell. The truss grid shell includes radially arranged folded line trusses and circumferential polygonal trusses. The radially arranged folded line trusses are radially oriented with the center of the top of the shell as the midpoint, forming the radial ridge line of the truss grid shell. The circumferential polygonal trusses are arranged in a ring with the center of the top of the shell as the midpoint, forming the circumferential ridge line of the truss grid shell. The folded plate concrete shell includes multiple planar concrete slabs. The radial intersection lines between the planar concrete slabs are polygonal and constitute the radial ridge lines of the folded plate concrete shell; the circumferential intersection lines between the planar concrete slabs are polygonal and constitute the circumferential ridge lines of the folded plate concrete shell; the arrangement of the radial ridge lines of the folded plate concrete shell and the radial ridge lines of the truss grid shell constitutes the radial ridge line arrangement; the arrangement of the circumferential ridge lines of the folded plate concrete shell and the circumferential ridge lines of the truss grid shell constitutes the circumferential ridge line arrangement; at least one of the radial ridge line arrangement and the circumferential ridge line arrangement is an alternating arrangement.

[0009] In one embodiment, both the radial ridge arrangement and the circumferential ridge arrangement are staggered. The midpoint of the side of the radial polygonal truss intersects and connects with the midpoint of the side of the circumferential polygonal truss. The radial ridge and the circumferential ridge of the folded plate concrete shell are staggered with the radial ridge and the circumferential ridge of the truss grid shell, respectively.

[0010] In one embodiment, the radial ridges are arranged in an alternating manner, wherein the turning point of the radial broken truss intersects with the midpoint of the side of the circumferential polygonal truss, and the radial ridges of the folded plate concrete shell and the radial ridges of the truss grid shell are arranged in an alternating manner.

[0011] In one embodiment, the circumferential ridge lines are arranged in an interlaced manner, wherein the midpoint of the side of the radial broken truss intersects and connects with the turning point of the circumferential polygonal truss, and the circumferential ridge lines of the folded plate concrete shell and the circumferential ridge lines of the truss grid shell are arranged in an interlaced manner.

[0012] In one embodiment, the radially polygonal truss includes a radial upper chord member, a radial web member, and a radial lower chord member, with the two ends of the radial web member connected to the radial upper chord member and the radial lower chord member, respectively. The circumferential polygonal truss includes a circumferential upper chord member, a circumferential web member, and a circumferential lower chord member, with the two ends of the circumferential web member connected to the circumferential upper chord member and the circumferential lower chord member, respectively.

[0013] In one embodiment, the system includes an upper chord folded plate concrete shell and / or a lower chord folded plate concrete shell. The upper chord folded plate concrete shell is disposed at the positions of the radial upper chord member and the circumferential upper chord member, and is connected to the radial upper chord member and the circumferential upper chord member by shear connectors. The lower chord folded plate concrete shell is disposed at the positions of the radial lower chord member and the circumferential lower chord member, and is connected to the radial lower chord member and the circumferential lower chord member by shear connectors.

[0014] In one embodiment, the radial upper chord member and the radial lower chord member constitute the radial ridge of the truss grid shell, and the circumferential upper chord member and the circumferential lower chord member constitute the circumferential ridge of the truss grid shell.

[0015] In one embodiment, the radial upper chord member, the radial web member, and the radial lower chord member are all square or rectangular steel tubes, and the circumferential upper chord member, the circumferential web member, and the circumferential lower chord member are all square or rectangular steel tubes.

[0016] In one embodiment, the planar concrete slab includes a triangular planar concrete slab and a quadrilateral planar concrete slab, the vertex of the triangular planar concrete slab coincides with the center of the top of the shell, the radial polygonal truss includes multiple radial straight segment trusses connected end to end, the circumferential polygonal truss includes multiple circumferential straight segment trusses connected end to end, the radial straight segment trusses and / or the circumferential straight segment trusses are located in the middle of the triangular planar concrete slab, and the radial straight segment trusses and / or the circumferential straight segment trusses are located in the middle of the quadrilateral planar concrete slab.

[0017] This invention provides a construction method for constructing a truss grid folded plate concrete composite shell roof structure as described above, comprising the following steps:

[0018] S1. Segmented processing of straight truss sections;

[0019] S2. Weld the straight-line truss segments to form a radial polygonal truss and a circumferential polygonal truss, thus completing the truss grid shell;

[0020] S3. Erect templates on the upper chord and / or lower chord of the truss grid shell, such that at least one of the radial ridge arrangement and the circumferential ridge arrangement is an alternating arrangement.

[0021] S4. Concrete is poured from the outside to the inside on the folded surface of the template to form an upper chord folded plate concrete shell and / or a lower chord folded plate concrete shell.

[0022] The present invention achieves the following technical effects compared to the prior art:

[0023] In the radial ridge arrangement and circumferential ridge arrangement of the present invention, at least one arrangement is an alternating arrangement, so that the radial broken truss and / or circumferential polygonal truss are located in the middle of the planar concrete slab. This can effectively reduce the span of the planar concrete slab and improve the out-of-plane bending resistance of the planar concrete slab while keeping the grid size unchanged, thereby improving the structural bearing capacity.

[0024] Other technical solutions included in this invention can also achieve the following technical effects:

[0025] The radial broken-line truss of the present invention includes multiple radial straight-line truss segments connected end to end, and the circumferential polygonal truss includes multiple circumferential straight-line truss segments connected end to end. That is, the radial broken-line truss and the circumferential polygonal truss in the truss grid shell are both straight-line members, and the planar concrete slab in the folded plate concrete shell is a planar member, which makes the processing and manufacturing less difficult. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a three-dimensional schematic diagram of the first type of ridge-interlaced truss grid folded plate concrete composite shell roof structure disclosed in an embodiment of the present invention;

[0028] Figure 2 This is a schematic plan view of the truss grid shell of the first type of ridge-interlaced truss grid folded plate concrete composite shell roof structure disclosed in the embodiments of the present invention;

[0029] Figure 3This is a schematic elevation view of the radial zigzag truss of the first type of ridge-interlaced truss grid folded plate concrete composite shell roof structure disclosed in the embodiments of the present invention;

[0030] Figure 4 This is a schematic plan view of the folded concrete shell of the first type of ridge-interlaced truss grid folded plate concrete composite shell roof structure disclosed in the embodiments of the present invention;

[0031] Figure 5 This is a schematic plan view of the ridge arrangement of the first type of ridge-interlaced truss grid folded plate concrete composite shell roof structure disclosed in the embodiments of the present invention;

[0032] Figure 6 This is a three-dimensional schematic diagram of the second type of ridge-interlaced truss grid folded plate concrete composite shell roof structure disclosed in an embodiment of the present invention;

[0033] Figure 7 This is a schematic elevation view of the radially zigzag truss of the second type of ridge-interlaced truss grid folded plate concrete composite shell roof structure disclosed in an embodiment of the present invention;

[0034] Figure 8 This is a schematic plan view of the folded plate concrete shell of the second type of ridge-interlaced truss grid folded plate concrete composite shell roof structure disclosed in the embodiments of the present invention;

[0035] Figure 9 This is a schematic plan view of the ridge arrangement of the second type of ridge-interlaced truss grid folded plate concrete composite shell roof structure disclosed in the embodiments of the present invention;

[0036] Figure 10 This is a three-dimensional schematic diagram of the third type of ridge-interlaced truss grid folded plate concrete composite shell roof structure disclosed in an embodiment of the present invention;

[0037] Figure 11 This is a schematic plan view of the truss grid shell of the third type of ridge-interlaced truss grid folded plate concrete composite shell roof structure disclosed in the embodiments of the present invention;

[0038] Figure 12 This is a schematic diagram of the ridge arrangement of the third type of ridge-interlaced truss grid folded plate concrete composite shell roof structure disclosed in the embodiments of the present invention;

[0039] Figure 13 This is a three-dimensional schematic diagram of the fourth type of ridge-interlaced truss grid folded plate concrete composite shell roof structure disclosed in the embodiments of the present invention;

[0040] Figure 14 This is a three-dimensional schematic diagram of the fifth type of ridge-interlaced truss grid folded plate concrete composite shell roof structure disclosed in the embodiments of the present invention;

[0041] Figure 15 This is a schematic diagram of the radial straight section truss elevation of the truss grid folded plate concrete composite shell roof structure disclosed in an embodiment of the present invention;

[0042] Figure 16 This is a schematic diagram of the circumferential straight section truss of the truss grid folded plate concrete composite shell roof structure disclosed in an embodiment of the present invention;

[0043] Figure 17 This is a schematic diagram of the template folding surface of the truss grid folded plate concrete composite shell roof structure disclosed in an embodiment of the present invention;

[0044] Among them, 10 is a radial polygonal truss; 20 is a circumferential polygonal truss; 30 is an upper chord folded plate concrete shell; 40 is a lower chord folded plate concrete shell; and 50 is a formwork folded surface.

[0045] 11. Radial top chord member; 12. Radial web member; 13. Radial bottom chord member; 14. Midpoint of radial edge; 15. Radial turning point; 16. Radial ridge of truss grid shell; 17. Radial straight segment truss;

[0046] 21. Circumferential upper chord member; 22. Circumferential belly member; 23. Circumferential lower chord member; 24. Circumferential midpoint; 25. Circumferential turning point; 26. Circumferential ridge line of truss grid shell; 27. Circumferential straight segment truss;

[0047] 31. Quadrilateral planar concrete slab; 32. Triangular planar concrete slab; 33. Radial ridge of a folded plate concrete shell; 34. Circumferential ridge of a folded plate concrete shell. Detailed Implementation

[0048] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] The purpose of this invention is to provide a truss grid folded plate concrete composite shell roof structure and construction method to solve the problems existing in the prior art. Among the radial ridge arrangement and the circumferential ridge arrangement, at least one arrangement is an alternating arrangement, so that the radial folded truss and / or the circumferential polygonal truss are located in the middle of the planar concrete slab. This can effectively reduce the span of the planar concrete slab and improve the out-of-plane bending resistance of the planar concrete slab without changing the grid size, thereby improving the structural bearing capacity.

[0050] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0051] like Figures 1-17 As shown, this invention provides a truss grid folded plate concrete composite shell roof structure, including a truss grid shell and a folded plate concrete shell. The truss grid shell includes radially zigzag trusses 10 and circumferential polygonal trusses 20. The radially zigzag trusses 10 are arranged radially with the center of the shell's top as the midpoint, forming the radial ridge line 16 of the truss grid shell. The circumferential polygonal trusses 20 are arranged in a ring with the center of the shell's top as the midpoint, forming the circumferential ridge line 26 of the truss grid shell. The radially zigzag trusses 10 and the circumferential polygonal trusses 20 connect at their intersections to form the entire truss grid shell.

[0052] The folded concrete shell can be located at the upper chord position, the lower chord position, or both. Each folded concrete shell at any location comprises multiple planar concrete slabs, which are joined together to form the entire folded concrete shell. The radial intersection lines between the planar concrete slabs are polygonal and form the radial ridge lines 33 of the folded concrete shell. The circumferential intersection lines between the planar concrete slabs are polygonal and form the circumferential ridge lines 34 of the folded concrete shell.

[0053] The arrangement of the radial ridge lines 33 of the folded plate concrete shell and the radial ridge lines 16 of the truss grid shell constitutes a radial ridge line arrangement; the arrangement of the circumferential ridge lines 34 of the folded plate concrete shell and the circumferential ridge lines 26 of the truss grid shell constitutes a circumferential ridge line arrangement; at least one of the radial ridge line arrangement and the circumferential ridge line arrangement is an alternating arrangement. The alternating arrangement referred to here means that adjacent radial ridge lines 33 of the folded plate concrete shell are connected by radial ridge lines 16 of the truss grid shell, and adjacent radial ridge lines 16 of the truss grid shell are connected by radial ridge lines 33 of the folded plate concrete shell; or, adjacent circumferential ridge lines 34 of the folded plate concrete shell are connected by circumferential ridge lines 26 of the truss grid shell, and adjacent circumferential ridge lines 26 of the truss grid shell are connected by circumferential ridge lines 34 of the folded plate concrete shell.

[0054] In the radial ridge arrangement and the circumferential ridge arrangement of the present invention, at least one of the arrangements is an alternating arrangement, so that the radial broken truss 10 and / or the circumferential polygonal truss 20 are located in the middle of the planar concrete slab. This can effectively reduce the span of the planar concrete slab and improve the out-of-plane bending resistance of the planar concrete slab while keeping the grid size unchanged, thereby improving the structural bearing capacity.

[0055] In one implementation, such as Figures 1-5 As shown, both the radial and circumferential ridge arrangements are staggered. The midpoint of the radial broken truss 10 (radial midpoint 14) intersects with the midpoint of the circumferential polygonal truss 20 (circumferential midpoint 24). The radial ridge 33 and circumferential ridge 34 of the folded plate concrete shell are staggered with the radial ridge 16 and circumferential ridge 26 of the truss grid shell, respectively. That is, the radial ridge 33 of the folded plate concrete shell and the radial ridge 16 of the truss grid shell are staggered, and the circumferential ridge 34 of the folded plate concrete shell and the circumferential ridge 26 of the truss grid shell are staggered.

[0056] This example provides a first type of truss grid folded plate concrete composite shell roof structure with staggered radial and circumferential ridge arrangements. This first type of truss grid folded plate concrete composite shell roof structure is designed for situations primarily bearing upper chord loads. By setting staggered radial and circumferential ridges at the upper chord position of the truss grid shell, the radial straight segment truss 17 and the circumferential straight segment truss 27 are both located in the middle of the quadrilateral planar concrete slab 31 or triangular planar concrete slab 32 within the folded plate concrete shell. This effectively reduces the span of the planar concrete slabs in both directions and improves their out-of-plane bending resistance, thereby enhancing the structural load-bearing capacity.

[0057] In one implementation, such as Figures 6-9 As shown, the radial ridges are arranged in an interlaced manner. At this time, the turning point (radial turning point 15) of the radial broken truss 10 intersects and connects with the midpoint of the side of the circumferential polygonal truss 20 (circumferential side midpoint 24). The radial ridges 33 of the folded plate concrete shell and the radial ridges 16 of the truss grid shell are arranged in an interlaced manner.

[0058] This example provides a second type of ridge-interlaced truss grid folded plate concrete composite shell roof structure, in which the radial ridges are arranged in an interlaced manner. In this second type of ridge-interlaced truss grid folded plate concrete composite shell roof structure, the radial zigzag truss 10 and the folded plate concrete shell differ in their zigzag arrangement from those in the first type of ridge-interlaced truss grid folded plate concrete composite shell roof structure. The circumferential polygonal truss 20 is the same as that in the first type of ridge-interlaced truss grid folded plate concrete composite shell roof structure. The radial turning point 15 of the radial zigzag truss 10 intersects and connects with the midpoint 24 of the circumferential edge of the circumferential polygonal truss 20, making the truss grid shell a unified whole. The radial ridges 33 of the folded plate concrete shell and 16 of the truss grid shell are arranged in an interlaced manner, and the circumferential ridges 34 and 26 of the folded plate concrete shell are arranged correspondingly. Other aspects are the same as in the first type of ridge-interlaced truss grid folded plate concrete composite shell roof structure.

[0059] The second type of ridge-interlaced truss grid folded plate concrete composite shell roof structure sets radial ridges in the upper chord position of the truss grid shell as folded plate concrete shells with interlaced radial ridges. This allows the radial straight segment truss 17 to be located in the middle of the quadrilateral planar concrete slab 31 or triangular planar concrete slab 32 in the folded plate concrete shell, effectively reducing the circumferential span of the planar concrete slab and improving the out-of-plane bending resistance of the planar concrete slab, thereby improving the structural bearing capacity.

[0060] In one implementation, such as Figures 10-12 As shown, the circumferential ridge lines are arranged in an interlaced manner. At this time, the midpoint of the radial broken truss 10 (radial midpoint 14) intersects and connects with the turning point of the circumferential polygonal truss 20 (circumferential turning point 25). The circumferential ridge line 34 of the folded plate concrete shell and the circumferential ridge line 26 of the truss grid shell are arranged in an interlaced manner.

[0061] This example provides a third type of ridge-interlaced truss grid folded plate concrete composite shell roof structure, in which the circumferential ridges are arranged in an interlaced manner. The folded plate concrete shell and the circumferential polygonal truss 20 are the same as those in the first type of ridge-interlaced truss grid folded plate concrete composite shell roof structure. However, the radial folded truss 10 differs from the first type of ridge-interlaced truss grid folded plate concrete composite shell roof structure in planar position by a certain angle, ensuring that the midpoint 14 of the radial side of the radial folded truss 10 intersects and connects with the circumferential turning point 25 of the circumferential polygonal truss 20, making the truss grid shell a whole. The radial ridge 33 of the folded plate concrete shell is arranged correspondingly to the radial ridge 16 of the truss grid shell, and the circumferential ridge 34 of the folded plate concrete shell is arranged interlaced with the circumferential ridge 26 of the truss grid shell. Other aspects are the same as those in the first type of ridge-interlaced truss grid folded plate concrete composite shell roof structure.

[0062] The third type of ridge-interlaced truss grid folded plate concrete composite shell roof structure sets up folded plate concrete shells with interlaced circumferential ridges at the upper chord position of the truss in the truss grid shell. This allows the circumferential straight segment truss 27 to be located in the middle of the quadrilateral planar concrete slab 31 or triangular planar concrete slab 32 in the folded plate concrete shell, effectively reducing the radial span of the planar concrete slab and improving the out-of-plane bending resistance of the planar concrete slab, thereby improving the structural bearing capacity.

[0063] In one implementation, such as Figure 3 , Figure 7 , Figure 15 and Figure 16 As shown, the radially polygonal truss 10 includes a radial upper chord member 11, a radial web member 12, and a radial lower chord member 13. The two ends of the radial web member 12 are connected to the radial upper chord member 11 and the radial lower chord member 13, respectively. The radial web member 12 can be connected end-to-end to form a polygonal structure, ensuring the structural strength and stability of the radially polygonal truss 10. The circumferential polygonal truss 20 includes a circumferential upper chord member 21, a circumferential web member 22, and a circumferential lower chord member 23. The two ends of the circumferential web member 22 are connected to the circumferential upper chord member 21 and the circumferential lower chord member 23, respectively. The circumferential web member 22 can be connected end-to-end to form a polygonal structure, ensuring the structural strength and stability of the circumferential polygonal truss 20.

[0064] In one implementation, such as Figure 1 , Figure 13 , Figure 14 As shown, the structure includes an upper chord folded plate concrete shell 30 and / or a lower chord folded plate concrete shell 40. The upper chord folded plate concrete shell 30 is located at the radial upper chord member 11 and the circumferential upper chord member 21, and is connected to the radial upper chord member 11 and the circumferential upper chord member 21 via shear-resistant connectors. The lower chord folded plate concrete shell 40 is located at the radial lower chord member 13 and the circumferential lower chord member 23, and is connected to the radial lower chord member 13 and the circumferential lower chord member 23 via shear-resistant connectors.

[0065] One example provides a fourth type of ridge-interlaced truss grid folded plate concrete composite shell roof structure, in which two layers of folded plate concrete shells are set at the upper and lower chord positions of the truss grid shell. That is, based on the first type of ridge-interlaced truss grid folded plate concrete composite shell roof structure, a lower chord folded plate concrete shell 40 is added at the lower chord position. At this time, an upper chord folded plate concrete shell 30 and a lower chord folded plate concrete shell 40 are set respectively, which can bear the upper chord and lower chord loads at the same time.

[0066] In another example, a fifth type of ridge-interlaced truss grid folded plate concrete composite shell roof structure is provided. In this structure, a folded plate concrete shell is set at the lower chord position of the truss grid shell. That is, based on the first type of ridge-interlaced truss grid folded plate concrete composite shell roof structure, the upper chord folded plate concrete shell 30 at the upper chord position is removed, and a lower chord folded plate concrete shell 40 is set at the lower chord position. At this time, only the lower chord folded plate concrete shell 40 is present, which mainly bears the lower chord load.

[0067] In one embodiment, combined with Figure 5 , Figure 9 and Figure 12 As shown, the radial upper chord member 11 and the radial lower chord member 13 form the radial ridge line 16 of the truss grid shell, and the circumferential upper chord member 21 and the circumferential lower chord member 23 form the circumferential ridge line 26 of the truss grid shell.

[0068] In one embodiment, the truss grid shell can be made of materials such as aluminum alloy or steel. In this example, the radial upper chord member 11, the radial web member 12, and the radial lower chord member 13 are all square or rectangular steel tubes, in which case the radial broken-line truss 10 is a steel structure; the circumferential upper chord member 21, the circumferential web member 22, and the circumferential lower chord member 23 are all square or rectangular steel tubes, in which case the circumferential polygonal truss 20 is a steel structure. The truss grid shell, composed of the radial broken-line truss 10 and the circumferential polygonal truss 20, is an overall steel structure.

[0069] In one embodiment, combined with Figure 4 As shown, the planar concrete slab includes a triangular planar concrete slab 32 and a quadrilateral planar concrete slab 31, with the vertex of the triangular planar concrete slab 32 coinciding with the center of the top of the shell. (Combined) Figure 15 and Figure 16 As shown, the radially polygonal truss 10 includes multiple radially straight truss segments 17 connected end-to-end, and the circumferential polygonal truss 20 includes multiple circumferentially straight truss segments 27 connected end-to-end. The radially straight truss segments 17 and / or the circumferentially straight truss segments 27 are located at the center of the triangular planar concrete slab 32, thus forming a straight or cross-shaped support at the center of the triangular planar concrete slab 32. Similarly, the radially straight truss segments 17 and / or the circumferentially straight truss segments 27 are located at the center of the quadrilateral planar concrete slab 31, thus forming a straight or cross-shaped support at the center of the quadrilateral planar concrete slab 31.

[0070] Combination Figures 1-17 As shown, the present invention provides a construction method for constructing a truss grid folded plate concrete composite shell roof structure as described above, comprising the following steps:

[0071] S1. Segmented processing of straight truss segments, including radial straight truss segment 17 and circumferential straight truss segment 27;

[0072] S2. Welding radial straight section truss 17 to form radial broken line truss 10, welding circumferential straight section truss 27 to form circumferential polygonal truss 20, the radial broken line truss 10 and circumferential polygonal truss 20 are combined to complete the truss grid shell.

[0073] S3. Erect templates on the upper and / or lower chords of the truss grid shell, such that at least one of the radial ridge arrangement and the circumferential ridge arrangement is an alternating arrangement.

[0074] S4. Concrete is poured from the outside to the inside on the folded surface 50 of the template to form an upper chord folded plate concrete shell 30 and / or a lower chord folded plate concrete shell 40.

[0075] In one embodiment, in step S1, the radial straight segment truss 17 and the circumferential straight segment truss 27 are processed in sections in the factory; in step S2, the radial straight segment truss 17 is welded at the construction site to form a radial broken line truss 10, and the circumferential straight segment truss 27 is welded at the construction site to form a circumferential polygonal truss 20.

[0076] In one embodiment, depending on the configuration of the folded concrete shell, templates are erected on the upper and / or lower chords of the truss grid shell to form a template folded surface 50 in which the folded surface ridge line intersects with the ridge line of the grid shell.

[0077] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A truss grid folded plate concrete composite shell roof structure, characterized in that, include: A truss grid shell, comprising radially polygonal trusses and circumferential polygonal trusses, wherein the radially polygonal trusses are arranged radially with the center of the top of the shell as the midpoint, and the radially polygonal trusses form the radial ridge line of the truss grid shell; and the circumferential polygonal trusses are arranged in a ring with the center of the top of the shell as the midpoint, and the circumferential polygonal trusses form the circumferential ridge line of the truss grid shell. And a folded concrete shell, the folded concrete shell comprising a plurality of planar concrete plates, the radial intersection lines between the planar concrete plates being folded lines and forming the radial ridge lines of the folded concrete shell, and the circumferential intersection lines between the planar concrete plates being polygonal and forming the circumferential ridge lines of the folded concrete shell. The arrangement of the radial ridges of the folded plate concrete shell and the radial ridges of the truss grid shell constitutes a radial ridge arrangement; the arrangement of the circumferential ridges of the folded plate concrete shell and the circumferential ridges of the truss grid shell constitutes a circumferential ridge arrangement. Both the radial ridge arrangement and the circumferential ridge arrangement are staggered. The midpoint of the side of the radial polygonal truss intersects and connects with the midpoint of the side of the circumferential polygonal truss. The radial ridge and the circumferential ridge of the folded plate concrete shell are staggered with the radial ridge and the circumferential ridge of the truss grid shell, respectively. The radial polygonal truss and the circumferential polygonal truss are located in the middle of the planar concrete slab.

2. The truss grid folded plate concrete composite shell roof structure according to claim 1, characterized in that: The radial polygonal truss includes a radial upper chord member, a radial web member, and a radial lower chord member. The two ends of the radial web member are respectively connected to the radial upper chord member and the radial lower chord member. The circumferential polygonal truss includes a circumferential upper chord member, a circumferential web member, and a circumferential lower chord member. The two ends of the circumferential web member are respectively connected to the circumferential upper chord member and the circumferential lower chord member.

3. The truss grid folded plate concrete composite shell roof structure according to claim 2, characterized in that: It includes an upper chord folded plate concrete shell and / or a lower chord folded plate concrete shell. The upper chord folded plate concrete shell is disposed at the positions of the radial upper chord member and the circumferential upper chord member, and is connected to the radial upper chord member and the circumferential upper chord member by shear-resistant connectors. The lower chord folded plate concrete shell is disposed at the positions of the radial lower chord member and the circumferential lower chord member, and is connected to the radial lower chord member and the circumferential lower chord member by shear-resistant connectors.

4. The truss grid folded plate concrete composite shell roof structure according to claim 2, characterized in that: The radial upper chord member and the radial lower chord member constitute the radial ridge of the truss grid shell, and the circumferential upper chord member and the circumferential lower chord member constitute the circumferential ridge of the truss grid shell.

5. The truss grid folded plate concrete composite shell roof structure according to claim 2, characterized in that: The radial upper chord member, the radial web member, and the radial lower chord member are all square or rectangular steel tubes, and the circumferential upper chord member, the circumferential web member, and the circumferential lower chord member are all square or rectangular steel tubes.

6. The truss grid folded plate concrete composite shell roof structure according to claim 1, characterized in that: The planar concrete slab includes a triangular planar concrete slab and a quadrilateral planar concrete slab. The vertex of the triangular planar concrete slab coincides with the center of the top of the shell. The radial polygonal truss includes multiple radial straight segment trusses connected end to end. The circumferential polygonal truss includes multiple circumferential straight segment trusses connected end to end. The radial straight segment truss and / or the circumferential straight segment truss are located in the middle of the triangular planar concrete slab. The radial straight segment truss and the circumferential straight segment truss are located in the middle of the quadrilateral planar concrete slab.

7. A construction method, characterized in that, For constructing a truss grid folded plate concrete composite shell roof structure as described in any one of claims 1-6, the following steps are included: S1. Segmented processing of straight truss sections; S2. Weld the straight-line truss segments to form a radial polygonal truss and a circumferential polygonal truss, thus completing the truss grid shell; S3. Erect templates on the upper chord and / or lower chord of the truss grid shell, such that at least one of the radial ridge arrangement and the circumferential ridge arrangement is an alternating arrangement. S4. Concrete is poured from the outside to the inside on the folded surface of the template to form an upper chord folded plate concrete shell and / or a lower chord folded plate concrete shell.

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