CN111764502A - Bolt ball net rack and splicing method thereof - Google Patents
Bolt ball net rack and splicing method thereof Download PDFInfo
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- CN111764502A CN111764502A CN202010615271.3A CN202010615271A CN111764502A CN 111764502 A CN111764502 A CN 111764502A CN 202010615271 A CN202010615271 A CN 202010615271A CN 111764502 A CN111764502 A CN 111764502A
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- ball
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- bolted
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- rod
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/19—Three-dimensional framework structures
- E04B1/1903—Connecting nodes specially adapted therefor
- E04B1/1906—Connecting nodes specially adapted therefor with central spherical, semispherical or polyhedral connecting element
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/19—Three-dimensional framework structures
- E04B1/1903—Connecting nodes specially adapted therefor
- E04B2001/1918—Connecting nodes specially adapted therefor with connecting nodes having flat radial connecting surfaces
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/19—Three-dimensional framework structures
- E04B2001/1957—Details of connections between nodes and struts
- E04B2001/196—Screw connections with axis parallel to the main axis of the strut
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
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Abstract
The invention relates to the technical field of building net rack erection, in particular to a bolt ball net rack and a splicing method thereof.
Description
Technical Field
The invention relates to the technical field of building net rack erection, in particular to a bolt ball net rack and a splicing method thereof.
Background
At present, in the building construction process, a net rack supporting template structure is required to be erected and construction operation of workers is facilitated; among the prior art, when building rack set up, what adopted is that steel pipe and steel are connected the structural component and are connected and form, and its not only connection degree of difficulty of connection process is higher, and the stability of connecting is relatively poor moreover, causes to set up building rack and wastes time and energy.
In view of this, this researcher sets up the relevant research of prior art based on the building rack, sets up the connecting rod that adopts specific structure and connects the ball structure equipment and form, has not only realized providing the convenience to setting up dismantlement and transportation after using, but also makes the work degree of difficulty and the working strength reduction of setting up the in-process, has reached labour saving and time saving's purpose, sets up the template rack structure when building and provides new thinking.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides a bolt ball net rack and a splicing method thereof.
The method is realized by the following technical scheme:
one of the purposes of the invention is to provide a bolt-ball connecting rod for splicing a bolt-ball net rack, which comprises a connecting rod and a rod end arranged at the front end of the connecting rod; the conical part is arranged at the connecting end head at the tail end of the conical part; the conical part is hollow, and a through hole is arranged at the front end of the conical part; the connecting end is provided with an internal thread, and the rod end is provided with an external thread matched with the internal thread on the connecting end; the sleeve is arranged in a bolt hole on the sleeve; the screw is provided with a screw tail part and a screw front end, and a bolt is arranged on a screw rod between the screw tail part and the screw front end; the screw penetrates through the through hole, so that the tail part of the screw is arranged in the conical part and fastened, the screw rod penetrates through the sleeve, and the bolt is inserted into the bolt hole, so that the bolt is positioned in the bolt hole; the two ends of the bolt-ball connecting rod have the same structure. Through both ends structure setting for the same, realized bolt ball rack concatenation shaping, cavity and through-hole setting in the connecting rod adopts toper portion, connecting rod, pole end, toper portion for bolt ball connecting rod simple structure connects stably, and convenient operation has also realized bolt ball rack structure's shaping convenience and convenience, has also improved stability, sleeve and bolt hole, screw and the setting of the bolt structure on the screw rod of screw.
According to the connecting method of the bolt-ball connecting rod for splicing the bolt-ball net rack, the screw rod on the screw penetrates through the conical part and passes through the through hole, so that the screw rod is positioned on the outer side of the conical part, and the tail part of the screw on the screw is positioned in the conical part; tightly connecting the rod end of the connecting rod with the connecting end of the conical part through threads; and sleeving the sleeve on the screw rod, aligning the position of the inserted pin on the screw rod with the inserted pin hole on the sleeve, and inserting the inserted pin to complete the connection of the bolt-ball connecting rod. The operation is simple and convenient.
The second object of the present invention is to provide a structure of a ball net unit, comprising: the connecting ball is arranged in a plurality of connecting holes on the connecting ball; a plurality of the bolt-ball connecting rods or the bolt-ball connecting rods connected by the method; the connecting hole is internally provided with threads matched with the threads on the screw rod, and the bolt-ball connecting rod is formed by connecting the screw rod and the connecting hole through the threads. Through the setting of connecting the ball structure, realized the connection of stable connection and multi-angle for bolt net structural integrity and wholeness form and have obtained the guarantee, have strengthened stability.
In order to improve the stability of the formed bolt-ball net rack and avoid the problem that the stress is uneven due to the fact that the included angle between every two bolt-ball connecting rods is too large or too small, and the whole stability of the bolt-ball net rack is poor, preferably, the included angle between every two adjacent bolt-ball connecting rods of the bolt-ball connecting rods is alpha, and the alpha is 20-60 degrees.
In order to form a vertical and upward stress end on the connecting ball, the overall stability of the bolt ball net rack is improved, the top end of the net rack is guaranteed to be provided with a stress bearing end, and the bolt ball net rack is preferable.
The invention also aims to provide a sliding device for sliding a bolted net on a shear wall, which comprises the shear wall, a preset slide rail a and a temporary beam, wherein the preset slide rail a and the temporary beam are arranged on the shear wall in advance; a support frame is arranged on the pulley b, and the support frame is connected with the pulley a through a positioning frame; the positioning frame is provided with positioning holes, and a bottom plate used for bearing the connecting balls in the bolt-net unit structure is arranged below the positioning holes. In the process of forming the bolt ball net rack, part of the bolt ball net rack structure units are continuously moved, so that the connection working strength is reduced, the forming of the bolt ball net rack is accelerated, and the working efficiency is improved.
In order to improve the flexibility and convenience of the sliding device, the support frame is preferably telescopic, and the height between the positioning frame and the pulley b can be adjusted.
The fourth purpose of the invention is to provide a bolted ball net rack, which comprises the bolted ball net unit structures, wherein each bolted ball net unit structure is formed by connecting the connecting rod and the connecting hole on the connecting ball through threads. The connection is more convenient and simpler, the operation is simpler, and the forming difficulty of the bolt ball net rack is reduced.
The fifth purpose of the invention is to provide the splicing method of the bolt ball net rack, which comprises the following steps:
(1) pre-mounting a preset slide rail a and a temporary beam on the shear wall in advance, mounting a preset slide rail b on the temporary beam, and mounting a pulley b and a pulley a on the preset slide rail a and the preset slide rail b respectively;
(2) a support frame is arranged on the pulley b, and the support frame is connected with the pulley a by a positioning frame; arranging a positioning hole on the positioning frame, and arranging a bottom plate at the lower end of the positioning hole;
(3) placing the first connecting ball on the bottom plate, fixing the upright post on the first connecting ball through the positioning hole, connecting the connecting rods according to the connecting method of claim 2, connecting the connecting rods with the connecting holes on the first connecting ball in a threaded manner, and connecting the corresponding connecting rods according to the required number; and then the other end of the connecting rod is connected with a second connecting ball through threads, a plurality of connecting rods are connected with the second connecting ball through threads, the second connecting ball is provided with a vertical upward upright post, the first connecting ball is moved left and right under the action of a preset slide rail a arranged on the shear wall and a preset slide rail b arranged on the temporary beam in advance, the connecting balls and the connecting rods are continuously connected, and the bolt ball net rack is spliced to form a formed net rack. The difficulty of forming the bolt ball net rack is reduced.
Compared with the prior art, the invention has the technical effects that:
the invention has simple structure, convenient connection operation, lower working intensity and working difficulty of the bolt ball net rack forming, realizes the erection of the time-saving and labor-saving forming building template net rack structure, and reduces the labor cost and the labor cost.
Drawings
Fig. 1 is a schematic structural diagram of a connecting rod in the invention.
Fig. 2 is a schematic view of the structure of the connecting ball of the present invention.
Fig. 3 is a schematic diagram of the structure of the inventive bolted net unit.
FIG. 4 is a schematic view of the structure of a part of the inventive bolted ball net.
FIG. 5 is a schematic view of a sliding device for sliding a bolted ball net on a shear wall.
FIG. 6 is a schematic view of a sliding structure of a screw net.
1-connecting rod 2-rod end 3-connecting end 4-conical part 5-through hole 6-sleeve 7-bolt hole 8-screw tail 9-bolt 10-screw front end 11-connecting hole 12-connecting ball 13-upright column 14-foundation 15-shear wall 16-preset slide rail a 17-temporary beam 18-preset slide rail b 19-pulley a 20-pulley b 21-supporting frame 22-positioning frame 23-positioning hole 24-left slide rail 25-left slide beam 26-right slide rail 27-right slide beam 28-forming net rack.
Detailed Description
The technical solution of the present invention is further defined below with reference to the specific embodiments, but the scope of the claims is not limited to the description.
As shown in fig. 1, in some embodiments, the stud-and-ball connecting rod for splicing stud-and-ball net frames comprises a connecting rod 1, a rod end 2 arranged at the front end of the connecting rod; the conical part 4 is arranged at the connecting end head 3 at the tail end of the conical part 4; the conical part 4 is hollow, and a through hole 5 is arranged at the front end of the conical part 4; the connecting end 3 is provided with an internal thread, and the end of the rod is provided with an external thread matched with the internal thread on the connecting end 3; a sleeve 6, a bolt hole 7 arranged on the sleeve 6; the screw is provided with a screw tail part 8 and a screw front end 10, and a bolt 9 is arranged on a screw rod between the screw tail part 8 and the screw front end 10; a screw penetrates through the through hole 5, so that the tail part 8 of the screw is arranged inside the conical part 4 to be fastened, a screw rod penetrates through the sleeve 6, and the bolt 9 is inserted into the bolt hole 7, so that the bolt 9 is positioned in the bolt hole 7; the two ends of the bolt-ball connecting rod have the same structure. The connecting rod forming stability is stronger, simple structure, simple operation.
According to the connecting method of the bolt-ball connecting rod for splicing the bolt-ball net rack, the screw rod on the screw penetrates through the conical part 4 and passes through the through hole 5, so that the screw rod is positioned on the outer side of the conical part 4, and the tail part 8 of the screw on the screw is positioned in the conical part 4; tightly connecting the rod end 2 of the connecting rod 1 with the connecting end 3 of the conical part 4 through threads; the sleeve 6 is sleeved on the screw rod, the position of the plug pin 9 on the screw rod is aligned to the plug pin hole 7 on the sleeve 6, and the plug pin 9 is inserted, so that the connection of the bolt ball connecting rod can be completed.
As shown in fig. 2 and 3, in some embodiments, a bolted net unit structure includes: the connecting ball 12 is arranged on the connecting ball 12 and provided with a plurality of connecting holes 11; a plurality of the bolt-ball connecting rods or the bolt-ball connecting rods connected by the method; the connecting hole 11 is internally provided with threads matched with the threads on the screw rod, and the bolt-ball connecting rod is formed by connecting the screw rod and the connecting hole 11 through the threads. The connection stability of the bolt-net unit structure is enhanced, the forming of the bolt-net unit structure is guaranteed, and the working intensity and the working difficulty of the forming of the bolt-net structure are reduced.
In some embodiments, as shown in fig. 3, the bolt-and-ball connecting rods have an included angle α between two adjacent bolt-and-ball connecting rods, and α is 20-60 °. The stability of bolt net shaping structure has been improved, has avoided the contained angle between the bolt ball connecting rod too big or the undersize leads to the relatively poor defect of stability of bolt net shaping overall structure, has improved shaping bolt ball rack structure's stability, has improved the security.
In some embodiments, as shown in fig. 3, the connecting ball 12 is provided with a stud 13. Make the bolt ball rack can form the weighing end, and then realize in connection ball department, the dispersion has improved the fashioned wholeness of bolt ball rack and whole atress homogeneity on each connecting rod, has guaranteed bolt ball rack structure's stability, has improved the security.
As shown in fig. 5, in some embodiments, the sliding device for sliding the bolted net on the shear wall comprises the shear wall 15, a preset slide rail a16 and a temporary beam 17 which are preset on the shear wall 15, a preset slide rail b18 is arranged on the temporary beam 17, a pulley b20 is arranged on the preset track 16, and a pulley a19 is arranged on the preset slide rail b 18; a support frame 21 is arranged on the pulley b20, and the support frame 21 is connected with the pulley a19 through a positioning frame 22; the positioning frame 22 is provided with positioning holes 23, and a bottom plate for bearing the connecting balls in the above-mentioned structure of the bolted net unit is arranged below the positioning holes 23. The connection between the bolt net unit structures is convenient, the operation is simple, and the time and the labor are saved. The positioning hole 23 arranged on the positioning frame 22 is a U-shaped groove, one end of the opening of the U-shaped groove is detachably connected on the supporting frame 21, and one end of the bottom of the U-shaped groove is fixedly connected on the pulley a 19; the bottom plate is detachably connected to the positioning frame 22; through the arrangement of the structure, the sliding device can be detached after the sliding device slides to form the bolt ball net rack, and the stability of the bolt ball net rack forming structure is improved.
As shown in fig. 5, in some embodiments, the supporting frame 21 has elasticity, and can adjust the height between the positioning frame 22 and the pulley b 20. The use on different shear walls is realized, the connection between the bolted net unit structures on different shear walls is facilitated, and the connection difficulty and the working strength between the bolted net unit structures are reduced.
In some embodiments, as shown in fig. 4, the bolted ball net frame comprises the above-mentioned bolted ball net unit structures, and the bolted ball net unit structures are connected with the connecting holes on the connecting balls 12 through the connecting rods 1 in a threaded manner. The integral stress uniformity of the net rack is improved, and the stability of the integral structure of the net rack is improved.
Specifically, in the operation process, the splicing method of the bolt ball net rack comprises the following steps:
(1) pre-mounting a preset slide rail a and a temporary beam on the shear wall in advance, mounting a preset slide rail b on the temporary beam, and mounting a pulley b and a pulley a on the preset slide rail a and the preset slide rail b respectively;
(2) a support frame is arranged on the pulley b, and the support frame is connected with the pulley a by a positioning frame; arranging a positioning hole on the positioning frame, and arranging a bottom plate at the lower end of the positioning hole;
(3) placing the first connecting ball on the bottom plate, fixing the upright post on the first connecting ball through the positioning hole, connecting the connecting rods according to the connecting method of claim 2, connecting the connecting rods with the connecting holes on the first connecting ball in a threaded manner, and connecting the corresponding connecting rods according to the required number; and then the other end of the connecting rod is connected with a second connecting ball through threads, a plurality of connecting rods are connected with the second connecting ball through threads, the second connecting ball is provided with a vertical upward upright post, the first connecting ball is moved left and right under the action of a preset slide rail a arranged on the shear wall and a preset slide rail b arranged on the temporary beam in advance, the connecting balls and the connecting rods are continuously connected, and the bolt ball net rack is spliced to form a formed net rack.
In some embodiments, the bolted ball grid structure created by the present invention is formed into a bolted ball grid unit structure by connecting the connecting rods and connecting balls, and after the bolted ball grid unit structure is connected into a formed grid 28, the formed grid is erected on the left and right sliding beams 25 and 26 as shown in fig. 6, so as to form an integral bolted grid structure.
Specifically, during the erection process, a left slide rail 24 may be arranged on the left slide beam 25, a right slide rail 26 may be arranged on the right slide beam 27, and two sliding devices for sliding the bolted ball net on the shear wall are utilized, and the pulley a and the pulley b on the sliding devices are arranged on the left slide rail 24 and the right slide rail 26, and are spliced and formed according to the above-mentioned spliced and formed bolted ball net structure method, and are continuously slid in the direction indicated by the arrow shown in fig. 6 until finally spliced and formed into a formed net rack 28 structure of the formed bolted ball net rack; the operation process is simple, and time and labor are saved.
When the spliced bolt net structure is installed by utilizing the sliding device for sliding the bolt net on the shear wall, after the installation is finished, the temporary beam is disassembled, so that the preset slide rail b18 arranged on the temporary beam is loosened, the structure of the whole sliding device is loosened, the positioning frame is pulled out from one end provided with the temporary beam, and the structures such as the bottom plate and the like are disassembled, the installation and assembly work of the bolt ball net rack structure can be finished, the convenience for forming the whole structure of the bolt ball net rack is improved, and the difficulty for integrally forming the bolt ball net rack is reduced.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (9)
1. A bolt-ball connecting rod for splicing a bolt-ball net rack is characterized by comprising a connecting rod (1) and a rod end (2) arranged at the front end of the connecting rod; the conical part (4) is arranged at the connecting end head (3) at the tail end of the conical part (4); the conical part (4) is hollow, and a through hole (5) is arranged at the front end of the conical part (4); the connecting end (3) is provided with an internal thread, and the rod end is provided with an external thread matched with the internal thread on the connecting end (3); a sleeve (6), a bolt hole (7) arranged on the sleeve (6); the screw is provided with a screw tail part (8) and a screw front end (10), and a bolt (9) is arranged on a screw rod between the screw tail part (8) and the screw front end (10); a screw penetrates through the through hole (5), so that the tail part (8) of the screw is arranged inside the conical part (4) and fastened, the screw rod penetrates through the sleeve (6), and the bolt (9) is inserted into the bolt hole (7), so that the bolt (9) is positioned in the bolt hole (7); the two ends of the bolt-ball connecting rod have the same structure.
2. The method for connecting bolted-spherical connecting rods for splicing bolted-spherical net racks according to claim 1, characterized in that: a screw rod on the screw penetrates through the interior of the conical part (4) and passes through the through hole (5), so that the screw rod is positioned on the outer side of the conical part (4), and a screw tail part (8) on the screw is positioned in the conical part (4); tightly connecting the rod end (2) of the connecting rod (1) with the connecting end (3) of the conical part (4) through threads; the sleeve (6) is sleeved on the screw rod, the position of the inserted pin (9) on the screw rod is aligned to the inserted pin hole (7) in the sleeve (6), and the inserted pin (9) is inserted, so that the connection of the bolt ball connecting rod can be completed.
3. A bolted net unit structure, comprising: the connecting ball (12) is arranged on the connecting ball (12) and provided with a plurality of connecting holes (11); a plurality of bolted ball connecting rods as defined in claim 1 or connected by the method as defined in claim 2; the connecting hole (11) is internally provided with threads matched with the threads on the screw rod, and the bolt ball connecting rod is formed by connecting the screw rod and the connecting hole (11) in a threaded manner.
4. A bolted net unit structure as claimed in claim 3, wherein said bolted ball connecting rods have an included angle α between two adjacent bolted ball connecting rods, α being 20-60 °.
5. Bolted net unit structure as claimed in claim 3, characterized in that said connecting balls (12) are provided with uprights (13).
6. A sliding device for sliding a bolted net on a shear wall is characterized by comprising the shear wall (15), a preset sliding rail a (16) and a temporary beam (17) which are arranged on the shear wall (15) in advance, wherein a preset sliding rail b (18) is arranged on the temporary beam (17), a pulley b (20) is arranged on the preset rail (16), and a pulley a (19) is arranged on the preset sliding rail b (18); a support frame (21) is arranged on the pulley b (20), and the support frame (21) is connected with the pulley a (19) through a positioning frame (22); the positioning holes (23) are arranged on the positioning frame (22), and the bottom plate for bearing the connecting balls in the structure of the bolted net unit as claimed in any one of claims 3-5 is arranged below the positioning holes (23).
7. Sliding device for a bolted net on a shear wall as claimed in claim 6, characterized in that said support frame (21) is telescopic and allows to adjust the height between the positioning frame (22) and the pulley b (20).
8. A bolted ball net mount, comprising bolted ball net unit structures as claimed in any one of claims 3 to 5, each bolted ball net unit structure being formed by a threaded connection between the bolted ball net unit structures via a connecting rod (1) and a connecting hole in a connecting ball (12).
9. The method of splicing a bolted ball grid as claimed in claim 8, comprising the steps of:
(1) pre-mounting a preset slide rail a and a temporary beam on the shear wall in advance, mounting a preset slide rail b on the temporary beam, and mounting a pulley b and a pulley a on the preset slide rail a and the preset slide rail b respectively;
(2) a support frame is arranged on the pulley b, and the support frame is connected with the pulley a by a positioning frame; arranging a positioning hole on the positioning frame, and arranging a bottom plate at the lower end of the positioning hole;
(3) placing the first connecting ball on the bottom plate, fixing the upright post on the first connecting ball through the positioning hole, connecting the connecting rods according to the connecting method of claim 2, connecting the connecting rods with the connecting holes on the first connecting ball in a threaded manner, and connecting the corresponding connecting rods according to the required number; and then the other end of the connecting rod is connected with a second connecting ball through threads, a plurality of connecting rods are connected with the second connecting ball through threads, the second connecting ball is provided with a vertical upward upright post, the first connecting ball is moved left and right under the action of a preset slide rail a arranged on the shear wall and a preset slide rail b arranged on the temporary beam in advance, the connecting balls and the connecting rods are continuously connected, and the bolt ball net rack is spliced to form a formed net rack.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010615271.3A CN111764502A (en) | 2020-06-30 | 2020-06-30 | Bolt ball net rack and splicing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010615271.3A CN111764502A (en) | 2020-06-30 | 2020-06-30 | Bolt ball net rack and splicing method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN111764502A true CN111764502A (en) | 2020-10-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010615271.3A Pending CN111764502A (en) | 2020-06-30 | 2020-06-30 | Bolt ball net rack and splicing method thereof |
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| Country | Link |
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| CN (1) | CN111764502A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113389277A (en) * | 2021-03-15 | 2021-09-14 | 中国水利水电第九工程局有限公司 | Roof construction method for building with double-layer steel structure grid composite membrane structure |
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| CA2423411A1 (en) * | 2003-04-04 | 2003-06-23 | Tom Samoila | Scaffold system |
| JP2009221843A (en) * | 2009-07-07 | 2009-10-01 | Ando Corp | Slide method for precast balcony, and roller and rail for sliding precast balcony |
| CN102182250A (en) * | 2011-04-08 | 2011-09-14 | 浙江东南网架股份有限公司 | Novel aluminum alloy bolt ball grid frame node and grid frame mounting method thereof |
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| CN113389277A (en) * | 2021-03-15 | 2021-09-14 | 中国水利水电第九工程局有限公司 | Roof construction method for building with double-layer steel structure grid composite membrane structure |
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