Reticulated shell roof structure capable of rapidly draining water and insulating heat and construction method thereof

Abstract

The invention relates to the technical field of roof structures, in particular to a reticulated shell roof structure capable of rapidly draining water and insulating heat and a construction method of the reticulated shell roof structure. The steel structure body comprises coconut tree-shaped steel structure stand columns, arched trusses and arc-shaped reticulated shell pieces. The roof system comprises a roof purlin structure, a double-layer plate and a liquid waterproof system; the house purlin structure is installed on the arc-shaped reticulated shell piece. The double-layer plate comprises an upper-layer structure and a lower-layer structure, and an air layer is arranged between the upper-layer structure and the lower-layer structure; the liquid waterproof system is paved on the top of the upper-layer structure; the drainage system comprises drainage ditches and drainage pipelines. By adopting the metal roof rapid-drainage, mute and heat-insulation double-layer plate, the metal roof rapid-drainage, mute and heat-insulation double-layer plate has the characteristics of efficient drainage, mute and noise reduction, excellent heat insulation performance, durability and protectiveness, simplicity and convenience in installation, safety, environmental protection, sustainability, attractiveness, multifunctionality and the like, and a better roof solution is provided for the building industry.

Description

Technical Field

[0001] The invention belongs to the technical field of roof structures, and in particular relates to a fast-draining and heat-insulating lattice shell roof structure and a construction method thereof. Background Art

[0002] With the rapid development of urban construction in my country, large-scale high-speed railway stations, airport terminals and other large-span metal roofs are widely used. Due to the vast territory of my country and the great differences in regional climate, coupled with the different design structures and material selection of metal roofs of large public buildings in various regions, the drainage, sound insulation and heat insulation functions are not perfect, resulting in some metal roofs leaking in heavy rain weather, which not only affects people's normal use, but also causes adverse social impacts. At present, there are few large-span metal roof double-layer panels that can achieve fast drainage, silent insulation and other functions. Summary of the invention

[0003] In view of the above problems in the prior art, the present invention proposes a fast drainage and heat insulation grid shell roof structure and a construction method thereof, which solve the problems of drainage, sound insulation and heat insulation of metal roofs with large spans and spaces.

[0004] In a first aspect, the present invention provides a fast-draining and heat-insulating gridshell roof structure, comprising: a steel structure body, a roofing system and a drainage system;

[0005] The steel structure body comprises a coconut tree-shaped steel structure column, an arched truss and an arc-shaped lattice shell sheet; a plurality of coconut tree-shaped steel structure columns are arrayed on the ground; each coconut tree-shaped steel structure column is connected to a plurality of adjacent coconut tree-shaped steel structure columns via the arched trusses distributed longitudinally and transversely; a plurality of the arched trusses distributed longitudinally and transversely enclose a plurality of roof installation windows; each of the roof installation windows is covered with one of the arc-shaped lattice shell sheets;

[0006] The roof system includes a purlin structure, a double-layer board and a liquid waterproof system; the purlin structure is installed on the arc-shaped lattice shell; the double-layer board includes an upper structure and a lower structure, the upper structure is paved on the top of the purlin structure, the lower structure is installed at the bottom of the purlin structure, and an air layer is provided between the upper structure and the lower structure; the liquid waterproof system is paved on the top of the upper structure;

[0007] The drainage system includes a drainage ditch and a drainage pipe; the drainage ditch is installed above the arch truss, the drainage ditch is connected to the purlin structure, and the bottom of the drainage ditch is lower than the purlin structure; the top of the drainage pipe is connected to the drainage ditch; the liquid waterproofing system is also laid in the drainage ditch.

[0008] Furthermore, the drainage ditch includes drainage ditches distributed longitudinally and transversely and peripheral ditches distributed at the edge of the roof system; the ends of the drainage ditches distributed longitudinally and transversely are connected to the low peripheral ditches; and the drainage pipe is connected to the peripheral ditch.

[0009] Furthermore, the coconut tree-shaped steel structure column includes a lattice column and a flower-shaped stigma assembled on the top of the lattice column; the flower-shaped stigma is connected to the arch truss; and the drainage pipe is arranged in the lattice column.

[0010] Furthermore, the roof system includes a plurality of roof units; one roof unit is disposed on each of the arc-shaped lattice shell sheets, and each of the roof units is formed by splicing a plurality of the double-layer panels into an arch shell structure.

[0011] Furthermore, the roof system also includes a skylight; a hollow portion is provided on the roof unit, and the skylight is provided in the hollow portion.

[0012] Furthermore, the lower structure of the double-layer board includes a lower rock wool board and a lower corrugated steel plate laid on the top of the rock wool board; the upper structure of the double-layer board includes an upper corrugated steel plate, a lower cement fiber board, a vapor barrier film, an upper rock wool board and an upper cement fiber board laid in sequence from bottom to top.

[0013] Furthermore, the purlin structure includes a purlin connector, a purlin support and a purlin; the purlin connector is connected to the arc-shaped lattice shell; the purlin support is connected to the connector, and the purlin is connected to the purlin support; the purlin support and the purlin support are connected between the upper structure and the lower structure.

[0014] Furthermore, the drainage ditch includes a drainage ditch keel and a drainage ditch plate; both sides of the drainage ditch keel are connected to the purlin structure, and the bottom of the drainage ditch keel maintains a distance from the arch truss; the drainage ditch plate is paved on the inner side and bottom of the drainage ditch keel; the liquid waterproofing system is paved on the surface of the drainage ditch plate.

[0015] Furthermore, the liquid waterproof system includes a polyurethane waterproof base coating, a glass fiber reinforcement layer, a waterproof top coating and an anti-ultraviolet coating which are arranged in sequence from bottom to top.

[0016] In a second aspect, the present invention further provides a construction method for the above-mentioned fast-draining and heat-insulating lattice shell roof structure, comprising the following steps:

[0017] Constructing the main steel structure: installing a plurality of coconut tree-shaped steel structure columns array at the target position on the ground, connecting each coconut tree-shaped steel structure column with a plurality of adjacent coconut tree-shaped steel structure columns by using an arched truss, so that a plurality of the arched trusses distributed longitudinally and transversely enclose a plurality of roof installation windows; hoisting an arc-shaped net shell sheet to the roof installation window, and connecting the arc-shaped net shell sheet to the arched truss;

[0018] Construction of the roof system: installing the purlin structure on the arc-shaped lattice shell; paving the upper structure of the double-layer board on the top of the purlin structure, and installing the lower structure of the double-layer board on the bottom of the purlin structure, so that the upper structure and the lower structure are spaced to form an air layer; paving the liquid waterproofing system on the top of the upper structure;

[0019] Construct the drainage system: install the drainage ditch above the arch truss, connect the drainage ditch and the purlin structure, and make the bottom of the drainage ditch lower than the purlin structure; install the drainage pipe so that the top of the drainage pipe is connected to the drainage ditch; lay the liquid waterproofing system in the drainage ditch.

[0020] The beneficial effects of the present invention are:

[0021] By setting an air layer between the upper structure and the lower structure of the double-layer board of the roof system, the heat entering the room through conduction and convection can be effectively slowed down, thereby improving the sound insulation effect, especially for noisy environments such as airport stations.

[0022] By using a polyurethane waterproof base coating with a low thermal conductivity coefficient as the base of the liquid waterproof system, combined with an anti-UV coating, the heat load on the roof from solar radiation can be reduced, effectively solving the problem of poor thermal insulation, heat insulation and sound insulation of single-layer metal roofs.

[0023] The roof system adopts an integrated structure of multiple roof units with an arch shell structure, combined with criss-crossed drainage ditches, so that rainwater can flow quickly along the curved surface of the roof, accelerating drainage through gravity, avoiding the accumulation of rainwater on the roof and effectively preventing the formation of pools.

[0024] The criss-cross drainage ditches can concentrate rainwater from various areas on the roof to the outermost side of the roof, reducing scattered drainage and ensuring that all rainwater can be discharged smoothly. Due to the longitudinal and transverse tilted design of the drainage ditch, the water flows faster, which can more effectively deal with heavy rainfall events and reduce the retention time of water on the roof. The combination of the arch shell roof and the drainage ditch design improves the drainage efficiency of the roof, reduces maintenance costs, and increases the service life and comfort of the building. The drainage pipe is hidden in the lattice column of the coconut tree-shaped steel structure column, achieving a perfect appearance and ensuring the appearance of the building, which is particularly suitable for three-dimensional complex curved roofs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the drainage structure of the fast-draining and heat-insulating gridshell roof structure of the present invention.

[0026] Figure 2 It is a structural schematic diagram of the steel structure main body of the fast-draining and heat-insulating lattice shell roof structure of the present invention.

[0027] Figure 3 It is a partial schematic diagram of the fast-draining and heat-insulating gridshell roof structure of the present invention.

[0028] Figure 4 for Figure 1 Schematic diagram of the local enlarged structure.

[0029] Figure 5 This is a schematic structural diagram of the rapid drainage and heat insulation grid shell roof structure of the present invention in which the drainage pipe is arranged in the lattice column.

[0030] Figure 6 The present invention is a schematic structural diagram of an arc-shaped grid shell sheet and its surrounding arched trusses and coconut tree-shaped steel structure columns of the fast-draining and heat-insulating grid shell roof structure of the present invention.

[0031] Figure 7 It is a schematic structural diagram of a drainage ditch keel of the drainage ditch of the present invention.

[0032] Figure 8 It is a schematic diagram of the partial structure of the drainage ditch and roof system of the present invention.

[0033] Fig. 9 It is a schematic diagram of the local structure of the roofing system of the present invention.

[0034] Fig.10 The figure is a schematic diagram of a structure in which a double-layer board of the present invention is installed on a purlin structure.

[0035] Fig.11 It is a schematic diagram of the partial cross-sectional structure of the double-layer board of the present invention.

[0036] Fig.12 The present invention is a schematic structural diagram of a purlin connector node of the purlin structure.

[0037] Fig.13 It is a structural schematic diagram of the purlin support of the roof purlin structure of the present invention.

[0038] Fig.14 It is a schematic structural diagram of the liquid waterproof system of the present invention.

[0039] In the figure:

[0040] 10-steel structure body; 11-coconut tree-shaped steel structure columns; 12-arched trusses; 13-arc-shaped lattice shells; 14-steel column edging;

[0041] 20-roofing system; 21-roofing unit; 22-U-bolt; 23-purlin support; 24-purlin; 25-lower rock wool board; 26-lower corrugated steel plate; 27-upper corrugated steel plate; 28-lower cement fiber board; 29-vapor barrier film; 210-upper rock wool board; 211-upper cement fiber board; 212-skylight;

[0042] 30-Liquid waterproofing system; 31-Polyurethane waterproofing base coating; 32-Fiberglass reinforcement layer; 33-Waterproofing top coating; 34-UV resistant coating;

[0043] 41- drainage ditch; 42- peripheral ditch; 43- drainage pipe; 44- drainage ditch main keel; 45- drainage ditch secondary keel; 46- drainage ditch connector; 47- drainage ditch closing aluminum strip;

[0044] 50-Eaves. DETAILED DESCRIPTION

[0045] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0046] like Figure 1 , Figure 2 As shown, the fast-draining and heat-insulating gridshell roof structure of the present invention comprises: a steel structure body 10, a roofing system 20 and a drainage system.

[0047] The steel structure body 10 includes coconut tree-shaped steel structure columns 11, arched trusses 12 and curved lattice shell sheets 13; the roof system 20 includes a purlin structure, a double-layer board, a liquid waterproofing system 30 and a skylight 212; and the drainage system includes a drainage ditch and a drainage pipe 43.

[0048] A plurality of coconut tree-shaped steel structure columns 11 are arranged in an array on the ground; each coconut tree-shaped steel structure column 11 is connected to a plurality of adjacent coconut tree-shaped steel structure columns 11 by arched trusses 12 distributed longitudinally and transversely; Figure 6 As shown, every four arched trusses 12 distributed longitudinally and transversely enclose a roof installation window; each roof installation window is covered with an arc-shaped grid shell sheet 13. Figure 5 , Figure 6 As shown, the coconut tree-shaped steel structure column 11 includes a lattice column and a flower-shaped column capital assembled on the top of the lattice column; the flower-shaped column capital is connected to the arch truss 12; wherein, the lattice column is also coated with a steel column edging 14 to enhance the indoor aesthetics of the coconut tree-shaped steel structure column 11.

[0049] The roof system 20 includes a plurality of roof units 21; a roof unit 21 is disposed on each arc-shaped grid shell sheet 13, and each roof unit 21 is composed of a plurality of double-layer panels spliced ​​together to form an arch shell structure. Figure 3 As shown, there is a complete roof unit 21, and a triangular hollow part is provided at each of the four corners of the roof unit 21, and a skylight 212 is provided in the hollow part to ensure indoor lighting. The four sides of the roof unit 21 are respectively provided with drainage ditches distributed longitudinally and transversely, and arched trusses 12 are correspondingly provided below the drainage ditches, and an arc-shaped lattice shell sheet 13 is correspondingly provided below each roof unit 21.

[0050] like Figure 7 , Figure 8 As shown, the drainage ditch is installed above the arch truss 12, and the drainage ditch is connected to the purlin structure, and the bottom of the drainage ditch is lower than the purlin structure; the top of the drainage pipe 43 is connected to the drainage ditch. The drainage ditch includes drainage ditches 41 distributed longitudinally and transversely and peripheral ditches 42 distributed at the edge of the roof system 20; the ends of the drainage ditches 41 distributed longitudinally and transversely are connected to the low-position peripheral ditches 42; multiple drainage pipes 43 are arranged in sequence along the setting direction of the peripheral ditches 42, and are all connected to the peripheral ditches 42. The drainage pipe 43 is arranged in the lattice column, and the peripheral ditch 42 is located above the outermost circle of arch trusses 12. As shown Figure 1 As shown, the grid shell roof structure also includes an eave, which is arranged on the outside of the outermost circle of arched trusses 12. The height of the eave is higher than the height of the peripheral ditch 42, and the eave also has a curved surface inclined toward the peripheral ditch 42 for guiding rainwater to flow toward the peripheral ditch 42. Figure 1 In the figure, the dotted arrow is the roof slope direction, and the solid arrow is the drainage direction. Figure 1 , Figure 4 It can be seen that rainwater flows along the roof slope to the drainage ditch 41 distributed vertically and horizontally, then converges to the peripheral ditch 42, and finally flows into the drainage pipe 43 connected to the peripheral ditch 42. The drainage pipe 43 can be connected to the municipal rainwater pipe network. Through the vertical and horizontal drainage ditch, roof slope and drainage pipe 43 design, only 28 drainage pipes 43 (each with a designed drainage capacity of 223L / S) are used to achieve rapid drainage of the roof, avoid water accumulation, and greatly reduce the number of subsequent maintenance.

[0051] like Figure 7 , Figure 8As shown, the gutter includes a gutter keel, a gutter plate and a gutter closing aluminum strip 47; the two sides of the gutter keel are connected to the purlin structure, and the bottom of the gutter keel is spaced from the arch truss 12 to ensure the heat insulation and sound insulation effect; the gutter keel includes a plurality of gutter main keels 44 arranged at intervals along the length direction of the gutter and gutter secondary keels 45 connected to both sides of the gutter main keel 44, and the gutter main keel 44 and the gutter secondary keel 45 are respectively connected to the purlin structure through the gutter connector 46. The gutter plate is paved on the inner side and bottom of the gutter keel; the liquid waterproofing system 30 is paved on the surface of the gutter plate.

[0052] like Fig. 9 , Fig.10 , Fig.11 As shown, the purlin structure is installed on the arc-shaped lattice shell sheet 13; the double-layer board includes an upper structure and a lower structure, the upper structure is paved on the top of the purlin structure, and the lower structure is installed at the bottom of the purlin structure, and an air layer is arranged between the upper structure and the lower structure. The lower structure includes a lower rock wool board 25 and a lower corrugated steel plate 26 paved on the top of the rock wool board; the upper structure includes an upper corrugated steel plate 27, a lower cement fiber board 28, a vapor barrier film 29, an upper rock wool board 210, and an upper cement fiber board 211 paved in sequence from bottom to top.

[0053] like Fig.12 , Fig.13 As shown, the purlin structure includes a purlin connector, a purlin bracket 23 and a purlin 24; the purlin connector is connected to the arc-shaped grid shell sheet 13; the purlin bracket 23 is connected to the connector, and the purlin 24 is connected to the purlin bracket 23; the purlin bracket 23 and the purlin 24 are supported and connected between the upper structure and the lower structure. The purlin connector can be a U-bolt 22. The arc-shaped grid shell sheet 13 is assembled by multiple pieces of circular tube grid shells. The U-bolt 22 clamps the circular tubes connecting the arc-shaped grid shell sheet 13.

[0054] The liquid waterproofing system 30 is installed on the top of the superstructure; the liquid waterproofing system 30 is also installed in the drainage ditch. Fig.14 As shown, the liquid waterproof system 30 includes a polyurethane waterproof base coating 31, a glass fiber reinforcement layer 32, a waterproof top coating 33 and an anti-ultraviolet coating 34 which are arranged in sequence from bottom to top.

[0055] The gridshell roof structure of the present invention determines the curved surface profile and elevation of each roof unit 21 based on the top surface contour surface of the roof system 20, thereby determining the number of double-layer panels of each roof unit 21 and the size, installation position and elevation of each double-layer panel. Correspondingly, the curved surface profile and elevation of the curved gridshell sheet 13 can also be determined. During the installation process, the height of the purlin support 23 and the purlin 24 on the curved gridshell sheet 13 is controlled by the purlin connector, thereby controlling the installation accuracy of the double-layer panels.

[0056] Based on the same inventive concept, the present invention also proposes a construction method for the above-mentioned fast drainage and heat insulation gridshell roof structure, comprising the following steps:

[0057] Construction of the steel structure main body 10: multiple coconut tree-shaped steel structure columns 11 are installed in an array at the target position on the ground, and the lattice columns and flowering column capitals of the coconut tree-shaped steel structure columns 11 are assembled on the ground. Before assembly, the target position of each coconut tree-shaped steel structure column 11 is first determined. During this process, the arch truss 12 can be assembled simultaneously. Each coconut tree-shaped steel structure column 11 is connected to multiple adjacent coconut tree-shaped steel structure columns 11 using the assembled arch truss 12, and each coconut tree-shaped steel structure column 11 is connected with four arch trusses 12. The four arch trusses 12 distributed longitudinally and transversely enclose multiple roof installation windows, and four coconut tree-shaped steel structure columns 11 are located at the four corners of each roof installation window; hoist the arc-shaped mesh shell piece 13 to the roof installation window, and connect the arc-shaped mesh shell piece 13 with the arch truss 12; the multiple mesh shells of the arc-shaped mesh shell piece 13 are hoisted piece by piece.

[0058] Construct the roof system 20 and the drainage system: install the purlin structure on the arc-shaped lattice shell sheet 13; install the upper structure of the double-layer board on the top of the purlin structure, and install the lower structure of the double-layer board on the bottom of the purlin structure, so that a distance is maintained between the upper structure and the lower structure to form an air layer; install the liquid waterproofing system 30 on the top of the upper structure; install the drainage ditch above the arch truss 12, connect the drainage ditch and the purlin structure, and make the bottom of the drainage ditch lower than the purlin structure; install the drainage pipe 43, so that the top of the drainage pipe 43 is connected to the drainage ditch; and install the liquid waterproofing system 30 in the drainage ditch.

[0059] Specifically include:

[0060] Install the U-bolts 22: When installing the U-bolts 22, the installation position and spacing of the U-bolts 22 must be determined, and a reasonable installation point must be determined according to the design specifications and the specifications of the roof panel. The U-bolts 22 are fixed to the supporting structure at the bottom thereof, which is the arc-shaped lattice shell sheet 13.

[0061] Install purlin bracket 23: Determine the installation position of purlin bracket 23 according to the design drawings, ensure that the contact surface between purlin bracket 23, purlin 24 and double-layer board is flat, and the installation position is accurate. When installing purlin bracket 23, the requirements of roof drainage slope should be met; check and verify the installation angle and elevation of purlin bracket 23.

[0062] Install purlin 24: place purlin 24 on purlin bracket 23, adjust to the designed position, use bolts to fix purlin 24 on purlin bracket 23, ensure that each connection point is evenly tightened, and ensure the verticality and straightness of purlin 24 during the fixing process. Use a level or plumb line to adjust if necessary; the installation direction is parallel to the drainage direction of the truss roof.

[0063] Install the gutter: Assemble the gutter keel and gutter plate of the gutter in advance. Keep the roof unit 21 of the roof system 20 above the arch truss 12 to leave space for installing the gutter. Hoist the assembled gutter to the reserved space and fix the gutter to the purlin structure on both sides with screws or rivets. When fixing, be careful not to damage the coating of the liquid waterproofing system 30 on the surface of the gutter and ensure that the gutter is firmly connected. The width of the gutter is set to 1704mm.

[0064] Install double-layer panels: a lower rock wool panel 25 and a lower corrugated steel panel 26 laid on top of the rock wool panel; the upper structure includes an upper corrugated steel panel 27, a lower cement fiber panel 28, a vapor barrier film 29, an upper rock wool panel 210 and an upper cement fiber panel 211 laid in sequence from bottom to top.

[0065] The lower rock wool board 25 is fixed to the lower laminated steel plate 26 with self-tapping screws. Install from the lower end of the roof to the higher end to ensure the continuity of the board and the rationality of the overlap. Connect with the purlin structure through self-tapping screws. The screws should pass through the lower laminated steel plate 26 and be fixed on the purlin 24. The spacing of the self-tapping screws is the width of the lower laminated steel plate 26 in the horizontal direction and the spacing of the purlin 24 in the vertical direction. Sealant or waterproof tape should be used at the lap joints and around the screw holes to ensure the sealing of the joints and holes to prevent moisture from penetrating. The edges and ends of the lower laminated steel plate 26 should be waterproofed to ensure the waterproof performance of the entire roof. The installation method of the upper laminated steel plate 27 is the same as that of the lower laminated steel plate 26. The lower cement fiber board 28 is fixed to the upper laminated steel plate 27 below with self-tapping screws. After installation, the flatness, firmness of fixation, and sealing of the joints of the board should be checked to ensure that there is no looseness or cracking. The vapor barrier film 29 should be laid flat on the surface of the lower cement fiber board 28 without wrinkles or bubbles. The film should cover the entire roof to ensure complete sealing. The upper rock wool board 210 is installed in the same way as the lower rock wool board 25. The upper cement fiber board 211 is installed in the same way as the lower cement fiber board 28. Roll the waterproof base layer of the liquid waterproof system 30, which includes a polyurethane waterproof base coating 31, a glass fiber reinforcement layer 32 and a waterproof top coating 33. Note that construction cannot be carried out on rainy days, as rainfall will damage the appearance of the base layer before curing. After the waterproof base layer is cured, roll the anti-ultraviolet coating 34 to complete a liquid waterproof system 30 without joints and surface defects.

[0066] The above are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A fast-draining and heat-insulating lattice shell roof structure, characterized in that: include: Main steel structure, roof system and drainage system; The steel structure body comprises a coconut tree-shaped steel structure column, an arched truss and an arc-shaped lattice shell sheet; a plurality of coconut tree-shaped steel structure columns are arrayed on the ground; each coconut tree-shaped steel structure column is connected to a plurality of adjacent coconut tree-shaped steel structure columns via the arched trusses distributed longitudinally and transversely; a plurality of the arched trusses distributed longitudinally and transversely enclose a plurality of roof installation windows; each of the roof installation windows is covered with one of the arc-shaped lattice shell sheets; The roof system includes a purlin structure, a double-layer board and a liquid waterproof system; the purlin structure is installed on the arc-shaped lattice shell; the double-layer board includes an upper structure and a lower structure, the upper structure is paved on the top of the purlin structure, the lower structure is installed at the bottom of the purlin structure, and an air layer is provided between the upper structure and the lower structure; the liquid waterproof system is paved on the top of the upper structure; The drainage system includes a drainage ditch and a drainage pipe; the drainage ditch is installed above the arch truss, the drainage ditch is connected to the purlin structure, and the bottom of the drainage ditch is lower than the purlin structure; the top of the drainage pipe is connected to the drainage ditch; the liquid waterproofing system is also laid in the drainage ditch.

2. The fast-draining and heat-insulating lattice shell roof structure according to claim 1 is characterized in that: The drainage ditch includes drainage ditches distributed longitudinally and transversely and peripheral ditches distributed at the edge of the roof system; the ends of the drainage ditches distributed longitudinally and transversely are connected to the low peripheral ditches; the drainage pipe is connected to the peripheral ditch.

3. The fast-draining and heat-insulating lattice shell roof structure according to claim 1 is characterized in that: The coconut tree-shaped steel structure column includes a lattice column and a flower-shaped column capital assembled on the top of the lattice column; the flower-shaped column capital is connected to the arch truss; and the drainage pipe is arranged in the lattice column.

4. The fast-draining and heat-insulating lattice shell roof structure according to claim 1 is characterized in that: The roof system includes a plurality of roof units; one roof unit is arranged on each of the arc-shaped lattice shell sheets, and each of the roof units is formed by splicing a plurality of the double-layer panels into an arch shell structure.

5. The fast-draining and heat-insulating lattice shell roof structure according to claim 4 is characterized in that: The roof system further includes a skylight; a hollow portion is provided on the roof unit, and the skylight is provided in the hollow portion.

6. The fast-draining and heat-insulating lattice shell roof structure according to any one of claims 1 to 5, characterized in that: The lower structure of the double-layer board includes a lower rock wool board and a lower corrugated steel plate laid on top of the rock wool board; the upper structure of the double-layer board includes an upper corrugated steel plate, a lower cement fiber board, a vapor barrier film, an upper rock wool board and an upper cement fiber board laid in sequence from bottom to top.

7. The fast-draining and heat-insulating lattice shell roof structure according to any one of claim 6, characterized in that: The purlin structure comprises a purlin connector, a purlin support and a purlin; the purlin connector is connected to the arc-shaped lattice shell; the purlin support is connected to the connector, and the purlin is connected to the purlin support; the purlin support and the purlin support are connected between the upper structure and the lower structure.

8. The fast-draining and heat-insulating lattice shell roof structure according to claim 6, characterized in that: The drainage ditch includes a drainage ditch keel and a drainage ditch plate; both sides of the drainage ditch keel are connected to the purlin structure, and the bottom of the drainage ditch keel maintains a distance from the arch truss; the drainage ditch plate is paved on the inner side and bottom of the drainage ditch keel; the liquid waterproofing system is paved on the surface of the drainage ditch plate.

9. The fast-draining and heat-insulating lattice shell roof structure according to claim 6, characterized in that: The liquid waterproof system comprises a polyurethane waterproof base coating, a glass fiber reinforcement layer, a waterproof top coating and an anti-ultraviolet coating which are arranged in sequence from bottom to top.

10. A construction method for the fast-draining and heat-insulating lattice shell roof structure as claimed in claim 1, characterized in that: The following steps are involved: Constructing the main steel structure: installing a plurality of coconut tree-shaped steel structure columns array at the target position on the ground, connecting each coconut tree-shaped steel structure column with a plurality of adjacent coconut tree-shaped steel structure columns by using an arched truss, so that a plurality of the arched trusses distributed longitudinally and transversely enclose a plurality of roof installation windows; hoisting an arc-shaped net shell sheet to the roof installation window, and connecting the arc-shaped net shell sheet to the arched truss; Construction of the roof system: installing the purlin structure on the arc-shaped lattice shell; paving the upper structure of the double-layer board on the top of the purlin structure, and installing the lower structure of the double-layer board on the bottom of the purlin structure, so that the upper structure and the lower structure are spaced to form an air layer; paving the liquid waterproofing system on the top of the upper structure; Construct the drainage system: install the drainage ditch above the arch truss, connect the drainage ditch and the purlin structure, and make the bottom of the drainage ditch lower than the purlin structure; install the drainage pipe so that the top of the drainage pipe is connected to the drainage ditch; lay the liquid waterproofing system in the drainage ditch.

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