CN110905075B - Prestressed space grid structure - Google Patents
Prestressed space grid structure Download PDFInfo
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- CN110905075B CN110905075B CN201911158716.3A CN201911158716A CN110905075B CN 110905075 B CN110905075 B CN 110905075B CN 201911158716 A CN201911158716 A CN 201911158716A CN 110905075 B CN110905075 B CN 110905075B
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- upper chord
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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
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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
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
- E04B1/98—Protection against other undesired influences or dangers against vibrations or shocks; against mechanical destruction, e.g. by air-raids
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
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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
- E04B2001/1996—Tensile-integrity structures, i.e. structures comprising compression struts connected through flexible tension members, e.g. cables
Abstract
The invention discloses a prestressed space grid structure which comprises an upper chord layer, a lower chord layer and a web member layer positioned between the upper chord layer and the lower chord layer, wherein a plurality of supports are uniformly distributed at the edge of the lower chord layer, connecting balls are arranged in the supports, connecting columns are arranged on the connecting balls, one ends, far away from a ball body, of the connecting columns are welded on the lower chord layer, a plurality of jacks are embedded in the top surface of a wall body, the supports are welded on ejector rods of the jacks, pressure sensors are arranged at the lower ends of the jacks, and a driving assembly for driving the ejector rods of the jacks to move is further arranged on the wall body. The invention has the effect of ensuring the even stress of the space grid by automatically adjusting the space grid to be horizontal.
Description
Technical Field
The invention relates to the field of spatial grids, in particular to a prestressed spatial grid structure.
Background
The spatial grid structure is a spatial three-dimensional frame formed by combining a plurality of rod pieces according to a certain rule, and the rod pieces are hinged or rigidly connected with each other. The space grid structure is mainly used in buildings, such as the top of a gymnasium, the top of a mall, the top of a warehouse and the top of an exhibition hall, and is mainly applied to the roofs of the large buildings to play a role of a supporting beam.
Chinese patent publication No. CN109235651A discloses a large-span rigid gable space grid-cable membrane structure system, which includes a rigid gable space grid, a cable arch truss, and a cable membrane structure having both vertical bearing and building enclosing functions. The rigid gable space grid bears longitudinal wind load, the cable arch truss bears transverse horizontal load, and the cable membrane structure bears roof vertical load and is maintained and covered.
When the large-span rigid gable space grid-cable membrane structure system is applied to the top of a building, the problem of settlement can exist in the building within a few years after the building is built, the settlement of the building is uneven, settlement joints are usually left in the building, however, for the space grid, the space grid is built on the top of the building and is in an evenly stressed state during initial building, and the space grid is locally stressed and is partially stressed in a lighter manner along with uneven settlement of the building, so that the position where the space grid is stressed is easy to damage, and potential safety hazards exist.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a prestressed space grid structure which has the advantage that after the walls of a building are settled to different degrees, the supporting points of the space grid can be uniformly stressed by automatically adjusting through a jack.
The technical purpose of the invention is realized by the following technical scheme: the utility model provides a prestressing force space grid structure, includes last quarter layer, last quarter layer and is located the web member layer between last quarter layer and the last quarter layer, a plurality of supports of edge equipartition on last quarter layer, be equipped with the connecting ball in the support, be equipped with the spliced pole on the connecting ball, keep away from the one end welding of connecting ball on the spliced pole on last quarter layer, the top surface of wall body inlays and is equipped with a plurality of jacks, on the ejector pin of support welding jack, the lower extreme of jack is equipped with pressure sensor, still be equipped with the drive assembly that is used for driving the ejector pin of jack to remove on the wall body.
Through the technical scheme, when the building is built, the upper chord layer and the lower chord layer are flatly arranged on the wall top. After the wall body is settled in different degrees after several years, the upper chord layer and the lower chord layer incline, the ejector rods of the jacks are driven by the driving assembly to ascend, so that the upper chord layer and the lower chord layer integrally return to a horizontal state, the upper chord layer and the lower chord layer are prevented from being stressed unevenly after inclining, the phenomenon that local stress is concentrated to cause serious damage to corresponding positions is avoided, and the arrangement can effectively avoid the condition.
The invention is further configured to: the driving assembly comprises a driving motor fixed on the wall body and a driving rod hinged to a handle of the jack, a disc is further arranged between the driving motor and the driving rod, the disc is fixed on an output shaft of the driving motor, and the driving rod is eccentrically and rotatably connected to the disc.
Through the technical scheme, when the driving motor rotates, the driving disc rotates, the driving rod is driven by the disc to circularly move up and down, the handle of the jack is driven by the driving rod to move up and down, so that the handle of the jack is automatically driven to move, and the ejector rod of the jack is further automatically controlled to automatically lift up.
The invention is further configured to: and a limiting sleeve is vertically embedded at the top of the wall body and positioned on one side of the jack, and a limiting rod inserted in the limiting sleeve is fixedly arranged on the lower chord layer.
Through the technical scheme, the limiting rod is inserted into the limiting sleeve, the limiting sleeve is embedded in the wall body, and one end of the limiting rod is welded on the upper chord layer, so that the upper chord layer can only move up and down but not move horizontally, and the overall horizontal displacement resistance is further improved.
The invention is further configured to: the damping device is arranged between the ejector rod of the jack and the support, the damping device comprises a damping sleeve welded on the ejector rod of the jack, a plurality of metal sheets and rubber sheets are arranged in the damping sleeve at intervals, and the support is connected in the damping sleeve in a sliding mode.
Through the technical scheme, when the ground vibrates, the upper chord layer also vibrates, the rubber sheet can deform, and then the connection part of the upper chord layer and the jack is prevented from being disconnected after the upper chord layer and the jack are rigidly connected.
The invention is further configured to: the web member layer comprises a plurality of ball nodes and connecting rods connected to the ball nodes, one ends of the connecting rods, far away from the ball nodes, are connected to the upper chord layer or the lower chord layer, the ball nodes, the upper chord layer and the lower chord layer are welded with a plurality of studs, and connecting holes which are opposite in threads and are in threaded connection with the studs are formed in two ends of each connecting rod.
Through the technical scheme, the connecting rod is rotated, the stud contracts or extends on the connecting rod, and when the stud retracts into the connecting rod, the connecting rod fixes the upper chord layer and the lower chord layer together, so that the effect of exerting a pre-tightening force is achieved, the upper chord layer and the lower chord layer are further connected more firmly, and the upper chord layer and the lower chord layer are prevented from shaking after the connecting rod is loosened.
The invention is further configured to: the middle position of the connecting rod is disconnected, a tension sensor is arranged at the disconnected position, and two ends of the tension sensor are respectively welded on the connecting rod.
Through the technical scheme, after the upper chord layer, the lower chord layer and the web member layer are assembled, the force applied to the connecting rods is not changed, when one or more connecting rods are broken, the stress condition of the connecting rods can be changed correspondingly, the readings of the corresponding tension sensors can also be changed, so that the problems can be found conveniently and timely in work, and the safety performance is improved in terms of timely local maintenance and maintenance of the problem points.
The invention is further configured to: and the middle position of the upper chord layer is vertically provided with a supporting rod for jacking the steel wire rope.
Through the technical scheme, the upper chord layer and the lower chord layer are composed of hundreds of steel pipes, and a plurality of connecting rods are arranged, so that part of the connecting rods are easily omitted, and the steel pipes do not apply pretightening force. The steel wire is jacked up by the supporting rod and is in a tight state, and then pre-tightening force is applied to the upper chord layer from two sides.
The invention is further configured to: the upper chord layer and the lower chord layer comprise a plurality of steel pipes, two ends of each steel pipe are sealed, inert gas is filled in the steel pipes, and an anti-rust layer is coated outside the steel pipes.
Through the technical scheme, the outer portion of the steel pipe is rustproof through the rustproof layer, the inner portion of the steel pipe is prevented from rusting through filling inert gas, and therefore the steel pipe is comprehensively protected from inside to outside, and the service life of the steel pipe is prolonged.
In conclusion, the invention has the following beneficial effects:
1. the jack is arranged, when the building is settled to different degrees, the ejector rod of the jack is adjusted, the self-setting leveling is carried out on the upper chord layer and the lower chord layer, and the uniform stress is ensured;
2. the jack can be automatically adjusted by the driving assembly, so that manual adjustment is avoided;
3. the tension sensor is used for detecting the stress condition of the connecting rod, and the safety performance is improved.
Drawings
Fig. 1 is a front view of the present embodiment.
Fig. 2 is an overall configuration diagram of the present embodiment.
Fig. 3 is a schematic structural diagram of the jack, the driving assembly and the upper chord layer of the embodiment.
Fig. 4 is a schematic structural view of the shock absorbing assembly of the present embodiment together with a jack and a stand.
Fig. 5 is a schematic view of a minimum unit structure of the combination of the upper chord layer, the lower chord layer and the web layer of the present embodiment.
Fig. 6 is a schematic diagram of the monitoring center workflow of the present embodiment.
Fig. 7 is a schematic structural view of the steel pipe of the present embodiment.
Reference numerals: 1. an upper chord layer; 11. a steel pipe; 12. a rust-proof layer; 13. a limiting rod; 14. a limiting sleeve; 15. connecting columns; 16. a connecting ball; 2. a lower chord layer; 3. a web layer; 31. a ball node; 32. a connecting rod; 321. connecting holes; 33. a stud; 34. a tension sensor; 4. a jack; 41. a support; 42. a pressure sensor; 5. a drive assembly; 51. a drive motor; 52. a drive rod; 53. a disc; 6. a damping device; 61. a metal sheet; 62. a rubber sheet; 63. a shock-absorbing sleeve; 7. a strut; 71. a steel wire.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Example (b): referring to fig. 1 and 2, the prestressed space lattice structure comprises an upper chord layer 1, a lower chord layer 2 and a web member layer 3 positioned between the upper chord layer 1 and the lower chord layer 2, wherein the lower chord layer 2 and the upper chord layer 1 are combined into a square frame shape by a plurality of steel pipes 11, the web member layer 3 comprises a plurality of spherical nodes 31 and a plurality of connecting rods 32 connected to the spherical nodes 31, the steel pipes 11 and the connecting rods 32 are connected to the spherical nodes 31, and one ends of the connecting rods 32 far away from the spherical nodes 31 are connected to the upper chord layer 1 or the lower chord layer 2, so that the space lattice is formed.
Referring to fig. 2, a plurality of supporting points are arranged on two parallel sides of the upper chord layer 1, and the supporting points are uniformly distributed on the upper chord layer 1.
Referring to fig. 3 and 4, a connecting column 15 is vertically arranged at a supporting point on the upper chord layer 1, a connecting ball 16 is welded at the lower end of the connecting column 15, a jack 4 is vertically embedded in a wall body, a support 41 is fixedly arranged on a mandril of the jack 4, and the connecting ball 16 is embedded in the support 41. The support 41 comprises two clamping seats, hemispherical ball holes are formed in the clamping seats, the connecting column 15 penetrates through the clamping seat at the upper end, and the two clamping seats are fixedly connected through bolts so as to clamp the connecting balls 16. The lower end of the jack 4 is provided with a pressure sensor 42, and the pressure sensor 42 is used for detecting the gravity of the upper chord layer 1 falling on the jack 4. After the wall bodies are settled to different degrees, the gravity of the upper chord layer 1 falling on the wall body can be correspondingly changed, the handle of the jack 4 is operated, the ejector rod of the jack 4 extends according to the error value between different settlings of the wall body, the local position of the upper chord layer 1 is jacked up, the upper chord layer 1 is horizontally arranged, and the jack 4 can further bear pressure uniformly.
Referring to fig. 3 and 4, when the upper chord layer 1 is inclined, the jack 4 at the lower position is stressed more and the jack 4 at the upper position is stressed less, so that when the pressure sensor 42 senses a change in value, the jack 4 on the pressure sensor 42 with the larger value is extended and the jack 4 on the pressure sensor 42 with the smaller value is kept unchanged, so that the upper chord layer 1 is horizontally arranged, compared with the initial value. The pressure sensor 42 is equivalent to a reference standard, so that people can quickly know the inclination condition of the specific upper chord layer 1. And a driving component 5 is arranged in the wall body, and the driving component 5 is used for driving the handle of the jack 4 to swing, so that the function of automatically adjusting the ejector rod of the jack 4 is achieved.
Referring to fig. 3 and 6, a monitoring center is provided in the building for receiving data from the pressure sensor 42 to further facilitate remote control of the drive assembly 5 to adjust the jacks 4. The settlement of the building will settle after a few years and therefore there is no need for reciprocating adjustment jacks 4, enabling the jacks 4 to be adjusted in place at one time. The driving assembly 5 includes a driving motor 51 embedded in the wall, a disc 53 fixed on an output shaft of the driving motor 51, and a driving rod 52 eccentrically and rotatably connected to the disc 53. When the driving motor 51 works, the disc 53 is driven to rotate, the disc 53 pulls the driving rod 52 to circularly move, the driving rod 52 drives the handle of the jack 4 to move up and down, and the ejector rod of the jack 4 extends at the moment, so that the function of automatically controlling the jack 4 is achieved. A PLC controller is also provided in the monitoring center, and the operation of the driving motor 51 is remotely controlled by the PLC controller.
Referring to fig. 4, a limiting rod 13 is vertically welded at the edge of the upper chord layer 1 and at one side of the jack 4, and a limiting sleeve 14 is vertically embedded in the wall body. The length of the limiting rod 13 is one meter and the limiting rod 13 can be connected in the limiting sleeve 14 in a sliding mode. The limiting rod 13 is used for limiting the horizontal displacement of the upper chord layer 1 and improving the horizontal position resisting capacity of the upper chord layer 1.
Referring to fig. 4, a damping device 6 is fixedly arranged on the top rod of the jack 4, the damping device 6 comprises a damping sleeve 63 welded on the top rod of the jack 4, a plurality of metal sheets 61 and rubber sheets 62 arranged in the damping sleeve 63 at intervals, and the support 41 is connected in the damping sleeve 63 in a sliding manner. When the ground generates weak vibration, the rubber sheet 62 can deform to play a role in damping the upper chord layer 1, so that the fracture of the joint caused by rigid connection is prevented.
Referring to fig. 5 and 6, eight studs 33 are welded on the ball joint 31 along the direction of the diameter of the ball, wherein four studs 33 are located on the same horizontal plane and are used for connecting the steel pipe 11, four studs 33 are left for connecting the connecting rod 32, the ball joint 31 is located on the same plane with the upper chord layer 1 or the lower chord layer 2, and two ends of the connecting rod 32 are respectively connected to the ball joint 31 on the lower chord layer 1 or the upper chord layer 2, so that the upper chord layer 1 and the lower chord layer 2 are fixedly connected together. Connecting holes 321 which are in threaded connection with the studs 33 are formed in two ends of the connecting rod 32, the connecting holes 321 in the two ends of the same connecting rod 32 are opposite threads, and the connecting rod 32 is rotated to enable the studs 33 to be contracted in the connecting rod 32, so that pre-tightening force is applied to the upper chord layer 1 and the lower chord layer 2. The middle section of the partial connecting rod 32 is broken, a tension sensor 34 is welded at the broken part of the connecting rod 32, and the tension sensor 34 is connected with a monitoring center through an electric signal, so that the connecting rod 32 is detected. When connecting rod 32 or other connecting rods 32 appear breaking, the registration of force sensor 34 can have the change this moment, consequently can in time detect at the surveillance center, and then remind the staff to investigate and overhaul, improve the security performance.
Referring to fig. 1, since the upper chord layer 1 and the lower chord layer 2 have a large span, there are steel pipes 11 or connecting rods 32 left without applying a pre-tightening force. Therefore, the support rods 7 are vertically arranged in the middle section of the upper chord layer 1, the steel wires 71 are fixedly arranged on two sides of the upper chord layer 1, the support rods 7 are used for jacking the steel wires 71, the steel wires 71 are always in a tight state, and pretightening force is further applied to the whole upper chord layer 1 through the steel wires 71.
Referring to fig. 7, both ends of a steel pipe 11 are sealed, argon gas is filled in the steel pipe 11, an anti-rust layer 12 is arranged outside the steel pipe 11, the outer part of the steel pipe 11 is effectively prevented from rusting through the anti-rust layer 12, the steel pipe 11 is effectively prevented from rusting from the inside by filling the argon gas in the steel pipe, and the service life of the steel pipe 11 is prolonged.
The action process is as follows: firstly, assembling an upper chord layer 1 and a lower chord layer 2 on site, then connecting a web member layer 3 between the upper chord layer 1 and the lower chord layer 2, fixedly installing a jack 4, a damping device 6 and a support 41 at the top end of a wall body, finally hoisting the upper chord layer 1, the lower chord layer 2 and the web member layer 3 above the wall body, and finally fixedly installing the upper chord layer 1 on the support 41.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (5)
1. The utility model provides a prestressing force space lattice construction, includes last chord layer (1), lower chord layer (2) and is located web member layer (3) between last chord layer (1) and lower chord layer (2), its characterized in that: a plurality of supports (41) are uniformly distributed at the edge of the lower chord layer (2), connecting balls (16) are arranged in the supports (41), connecting columns (15) are arranged on the connecting balls (16), one ends, far away from the connecting balls (16), of the connecting columns (15) are welded on the upper chord layer (2), a plurality of jacks (4) are embedded in the top surface of the wall body, the supports (41) are welded on ejector rods of the jacks (4), pressure sensors (42) are arranged at the lower ends of the jacks (4), and a driving assembly (5) for driving the ejector rods of the jacks (4) to move is further arranged on the wall body;
the driving assembly (5) comprises a driving motor (51) fixed on a wall body and a driving rod (52) hinged on a handle of the jack (4), a disc (53) is further arranged between the driving motor (51) and the driving rod (52), the disc (53) is fixed on an output shaft of the driving motor (51), and the driving rod (52) is eccentrically and rotatably connected to the disc (53);
a limiting sleeve (14) is vertically embedded in the top of the wall body and positioned on one side of the jack (4), and a limiting rod (13) inserted in the limiting sleeve (14) is fixedly arranged on the lower chord layer (2);
be equipped with damping device (6) between the ejector pin of jack (4) and support (41), damping device (6) are including welding shock attenuation cover (63), sheetmetal (61) and the sheet rubber (62) that are located a plurality of intervals settings in shock attenuation cover (63) on the ejector pin of jack (4), support (41) are slided and are connected in shock attenuation cover (63).
2. The pre-stressed spatial grid structure of claim 1, wherein: the web member layer (3) comprises a plurality of ball nodes (31) and connecting rods (32) connected to the ball nodes (31), one ends, far away from the ball nodes (31), of the connecting rods (32) are connected to the upper chord layer (1) or the lower chord layer (2), a plurality of studs (33) are welded to the ball nodes (31), the upper chord layer (1) and the lower chord layer (2), and connecting holes (321) which are in opposite threads and are in threaded connection with the studs (33) are formed in two ends of each connecting rod (32).
3. The pre-stressed spatial grid structure of claim 2, wherein: the middle position of the connecting rod (32) is disconnected, a tension sensor (34) is arranged at the disconnected position, and two ends of the tension sensor (34) are respectively welded on the connecting rod (32).
4. The pre-stressed spatial grid structure of claim 1, wherein: two ends of the upper chord layer (1) are provided with steel wires (71) ropes, and a support rod (7) used for jacking the steel wires (71) ropes is vertically arranged in the middle of the upper chord layer (1).
5. The pre-stressed spatial grid structure of claim 2, wherein: the upper chord layer (1) and the lower chord layer (2) comprise a plurality of steel pipes (11), two ends of each steel pipe (11) are sealed, inert gas is filled in each steel pipe (11), and an anti-rust layer (12) is coated outside each steel pipe (11).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911158716.3A CN110905075B (en) | 2019-11-22 | 2019-11-22 | Prestressed space grid structure |
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| CN201911158716.3A CN110905075B (en) | 2019-11-22 | 2019-11-22 | Prestressed space grid structure |
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| CN110905075A CN110905075A (en) | 2020-03-24 |
| CN110905075B true CN110905075B (en) | 2021-01-26 |
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| CN113374072B (en) * | 2021-05-21 | 2022-09-16 | 徐州腾鲁重工科技有限公司 | Steel structure for connecting net racks |
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| GB630562A (en) * | 1945-06-22 | 1949-10-17 | Konrad Wachsmann | Improvements in or relating to a building construction |
| GB809846A (en) * | 1955-08-25 | 1959-03-04 | Maschf Augsburg Nuernberg Ag | Improvements in arrangements for ascertaining and correcting the canting of the foundations of buildings and machines |
| CN2224875Y (en) * | 1994-12-15 | 1996-04-17 | 开封市华中空间结构有限公司 | Ball joint for space steel frame |
| CN201428193Y (en) * | 2009-07-09 | 2010-03-24 | 贵州大学 | Approximate square plane superlarge space prestressed steel lattice structure roof |
| CN203430059U (en) * | 2013-08-22 | 2014-02-12 | 中国十七冶集团有限公司 | Temporary fixing device used for installing large-span steel structure roof primary truss |
| CN103898990B (en) * | 2014-04-10 | 2016-04-20 | 北京工业大学 | One is threaded individual layer spatial mesh structure |
| CN204001416U (en) * | 2014-07-22 | 2014-12-10 | 河南天丰钢结构建设有限公司 | For the assemble type truss of the factory building of constructing |
| CN105888131B (en) * | 2016-04-22 | 2018-09-04 | 山东建筑大学 | A kind of bending yield type energy dissipating truss |
| CN106930590B (en) * | 2016-09-21 | 2023-03-10 | 中国地震局工程力学研究所 | Novel space grid structure ball joint device with damping function |
| CN206459893U (en) * | 2016-12-15 | 2017-09-01 | 广西建宏建筑工程质量检测有限公司 | A kind of bolted spherical node bearing capacity fixture |
| CN207499150U (en) * | 2017-11-24 | 2018-06-15 | 河南大学 | A kind of Novel bolt ball node |
| CN108343155B (en) * | 2018-01-16 | 2019-09-06 | 中国航空规划设计研究总院有限公司 | It is a kind of to improve the large span construction method that even across hangar internal force is distributed |
| CN208072634U (en) * | 2018-04-17 | 2018-11-09 | 合肥水泥研究设计院有限公司 | A kind of steel truss support |
| CN208473113U (en) * | 2018-05-04 | 2019-02-05 | 国电大渡河沙坪水电建设有限公司 | A kind of factory building roof rack project installation structure |
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