CN112523413B - Detachable reset design method applied to scoop screen in large-span cable dome structure - Google Patents
Detachable reset design method applied to scoop screen in large-span cable dome structure Download PDFInfo
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- CN112523413B CN112523413B CN202011481743.7A CN202011481743A CN112523413B CN 112523413 B CN112523413 B CN 112523413B CN 202011481743 A CN202011481743 A CN 202011481743A CN 112523413 B CN112523413 B CN 112523413B
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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
- E04B7/00—Roofs; Roof construction with regard to insulation
- E04B7/08—Vaulted roofs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
- B66C1/10—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means
- B66C1/12—Slings comprising chains, wires, ropes, or bands; Nets
- B66C1/14—Slings with hooks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/04—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack
- B66C13/08—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack for depositing loads in desired attitudes or positions
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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
- E04B1/32—Arched structures; Vaulted structures; Folded 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
- E04B7/00—Roofs; Roof construction with regard to insulation
- E04B7/14—Suspended roofs
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/302—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements characterised by the form or geometrical disposition of the individual elements
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Abstract
The invention discloses a detachable reset design method of a bucket screen applied to a large-span cable dome structure. The cable dome structure cable member is less influenced by force in the process of disassembling and resetting the bucket screen, and the use safety of the cable dome structure building is guaranteed.
Description
Technical Field
The invention relates to a disassembly and assembly technology of a large-scale bucket screen in the field of buildings such as stadiums, in particular to a disassembly and reset design method of the bucket screen applied to a large-span cable dome structure.
Background
In recent years, the technology of LED display screens is continuously innovative, and the application range is continuously expanded. The suspended bucket-shaped display screen arranged in the center of the large stadium can create a fire-explosion competition field atmosphere, and can bring advertising benefits for the stadium, so that the display screen becomes a mainstream of application of a novel display device in the large stadium at home and abroad. At present, most of stadium structure systems applying the suspended bucket screen mainly use rigid steel roof structure systems, such as a grid structure, a reticulated shell structure, a truss structure, a suspended dome structure and the like, the bucket screen is rarely applied to flexible tensile structure systems such as a cable dome structure, and related mounting and dismounting design methods of the bucket screen applied to the flexible structure are rare. In the actual cable dome structure, in the construction process of a roof structure, a cable member is firstly tensioned to generate prestress to form rigidity and shape required by structure bearing, then the construction of a metal roof and a decoration ceiling is carried out, and finally the hoisting construction of a bucket screen device is carried out. The bucket screen needs to be detached in the later bucket screen maintenance stage, but the internal force of the cable member is sensitive due to the limitation of the structural characteristics of the cable dome structure system, so that the internal force of the cable member is easy to change in the process of detaching and maintaining the bucket screen with larger weight, the looseness of partial inhaul cables and redistribution of the cable force can be caused, and the cable force is different from the internal force in the design stage when the cable dome structure is installed after maintenance, so that the safety of the whole cable dome structure can be threatened.
In order to avoid redistribution of cable force caused by disassembly in the construction process, the weight of a screen device of the bucket is equivalent by usually adopting a mode of hanging counterweights such as sandbags, and theoretically, the cable force cannot be changed if the counterweights such as the sandbags are the same as the weight of the screen of the bucket, but the situation that the sequence exists in the actual assembly and disassembly processes is difficult to ensure that the weight of the lifted screen of the bucket and the unloaded additional counterweights are synchronous and equivalent, the cable force is inevitably changed, and the construction safety and the working efficiency of the high-altitude operation relying on manpower are lower. In addition, the common sidewalks above the stadium or the special lifting maintenance platform is arranged to detach and maintain the heavy bucket screen, the high-altitude operation range and the one-time unloading process are achieved, personal safety cannot be well guaranteed, internal force of a roof member is easy to change, and in addition, for the weight of the heavy bucket screen such as 30 tons or 40 tons, the counter weight with the weight is difficult to find and large mechanical equipment is required to be hoisted to a replacement position. Therefore, the invention is necessary to provide a safe, simple and convenient overweight scuttle screen detachable re-assembly design method which has small influence on the stress of a cable member in a cable dome structure.
Disclosure of Invention
The invention provides a detachable reset design method for a bucket screen applied to a large-span cable dome structure, which can provide reference basis for the installation and the detachment of the bucket screen in a related flexible tension cable structure system containing the bucket screen.
In order to achieve the purpose, the invention adopts the following scheme:
the detachable reset design method of the scoop screen applied to the large-span cable dome structure comprises the following steps,
disassembling step (1): a group of pulley blocks are installed at each bucket screen hanging point of a cable dome structure, each pulley block comprises two fixed pulleys and two movable pulleys which are fixed into a whole, the fixed pulleys are connected to the hanging points, the two movable pulleys are connected below the corresponding fixed pulleys, a prestressed guy cable is arranged, one end of the prestressed guy cable is fixedly connected to a ground anchor embedded in a field below the bucket screen, the other end of the prestressed guy cable is dispersed into a plurality of guy cables through a diffusion disc, the dispersed guy cables are respectively and correspondingly connected with a hook at the lower end of one movable pulley in each pulley block, a hook at the lower end of the other movable pulley of each pulley block is correspondingly connected with a hanging point of the bucket screen, and the movable pulleys of each pulley block are respectively connected with a traction device;
disassembling step (2): placing a cushion pad in advance on the field below the hopper screen, lowering each movable pulley connected with the hopper screen through the traction device to enable the hopper screen to descend, gradually unloading the weight of the hopper screen attached to the movable pulley by the movable pulley connected with the hopper screen from the critical state that the hopper screen is in contact with the surface of the cushion pad and is not unloaded, transferring the weight of the hopper screen to the cushion pad, and simultaneously tightening the other movable pulley connected with a prestress cable in the pulley block through the traction device to control the tension of the traction device so that the tension applied to the prestress cable is equal to the weight of the hopper screen transferred to the cushion pad;
disassembling step (3): after the hopper screen is completely removed, a lifting hook of a movable pulley connected with the hopper screen is separated from a suspension point of the hopper screen, and the movable pulley connected with a prestressed inhaul cable is kept still, so that the prestressed inhaul cable loads a load equivalent to the weight of the hopper screen;
the reset installation process of the screen bucket comprises the following steps,
resetting step (1): lowering a movable pulley which is arranged in the pulley block in a hollow way and is used for being connected with the hopper screen, and correspondingly connecting each suspension point of the hopper screen with a lower end lifting hook of each lowered movable pulley;
resetting step (2): the movable pulleys connected with the bucket screen are gradually tightened through the traction device, the movable pulleys are gradually added with part of the weight lifted by the bucket screen, and meanwhile, the movable pulleys connected with the prestress guy cables in the pulley block are placed downwards through the traction device, so that the pulling force removed by the prestress guy cables is equal to the sum of the weights of the movable pulleys added in the process of lifting the bucket screen;
resetting step (3): after the bucket screen is completely lifted, the movable pulley connected with the bucket screen gradually rises to a specified height, then the suspension point of the bucket screen is connected with the suspension point of the cable dome structure, the movable pulley connected with the prestressed stay cable is gradually lowered to the ground, and then the prestressed stay cable is dismantled.
The invention also has the following preferred design:
the traction device is a double-drum winch with a hydraulic jack, wherein one drum is driven by a self-contained motor to pull a movable pulley to lift the bucket screen, and the other drum is driven by the hydraulic jack to control the tension of a prestressed inhaul cable connected with the movable pulley.
The buffer cushion is internally provided with a spring, and the buffer cushion needs to have enough rigidity and height to prolong the unloading process of the bucket screen, so that enough operation time is reserved for the process that the hydraulic jack stretches the prestressed stay cable to synchronously attach the pulling force equivalent to the unloading of the bucket screen to the movable pulley, and the hanging load on a hanging point is prevented from being changed violently due to the instant unloading when the bucket screen is in direct contact with the ground.
In the pulley block, a hook at the upper end of each movable pulley is connected with a traction rope, and the traction rope sequentially bypasses the corresponding fixed pulley and the movable pulley and is then connected with the traction device.
The invention has the following beneficial effects:
(1) the invention provides a detachable reset design method of a scoop screen for a large-span flexible stretched cable dome structure system, which particularly utilizes the tension in a prestressed cable to be equivalent to the weight of a scoop screen device, can ensure that a cable dome structure cable member is less influenced by stress by controlling the tension in the prestressed cable in the process of detaching and resetting the scoop screen device, and ensures the use safety of a cable dome structure building.
(2) The invention is provided with the specific pulley block, is simple and convenient to manufacture and install, can synchronously realize the lifting of the hopper screen and the prestressed steel cable, and is beneficial to ensuring that the hanging load at the same hanging point position is unchanged, thereby reducing the stress influence of the cable component and ensuring the safety and reliability of the disassembling and resetting processes of the hopper screen.
(3) The disassembling and resetting processes of the bucket screen device mainly depend on traction equipment such as a winch, high-altitude operation does not need to be carried out by too much manpower, the construction efficiency is improved, the construction safety is also improved, the economy is good, and the bucket screen device is easy to popularize and use in relevant actual engineering.
(4) The method can be applied to the installation design of the hopper screen in a large-span flexible inhaul cable dome structure system, and can also provide reference basis for the installation design of the hopper screen in other large-span roof structure systems.
Drawings
FIG. 1 is a three-dimensional model of a cable dome structure according to an embodiment;
FIG. 2 is a structural diagram of a suspended bucket screen in an embodiment;
FIG. 3 is a schematic diagram of the connection of the device in the process of disassembling and resetting the bucket screen in the embodiment;
FIG. 4 is a schematic view of a detaching process of the screen device in the embodiment;
FIG. 5 is a schematic diagram of a resetting process of the screen device in the embodiment;
FIG. 6 is a front view of the pulley block in the embodiment;
FIG. 7 is a side view of the pulley block of FIG. 5;
FIG. 8 is a schematic view of a dual drum winch assembly including hydraulic jacks;
description of the reference numerals
Crown block-a 1, a 2; movable pulley-b 1, b 2;
1-a hopper screen; 2-prestressed stay cable; 3-a ground anchor; 4-anchor cable joints; 5-a diffusion disc; 6-a buffer pad; 7-a traction device; 7 a-a first pull-cord; 7 b-a second pull cord; 7 c-a movable splint; 7 d-a second haulage rope fixing joint; 7 e-jack; 8-backing plate.
Detailed Description
The technical solutions of the present invention are described in detail below with reference to the accompanying drawings and examples, so that those skilled in the art can better understand and implement the technical solutions of the present invention.
As shown in fig. 1, a cable dome structure of a certain gymnasium is provided, a bucket screen of fig. 2 is hung in the center of the gymnasium, the bucket screen weighs 50 tons, the weight of the bucket screen device is uniformly distributed on 8 hanging points of the cable dome structure, the vertical load of each hanging point is 6.25 tons, and the bucket screen is detached and reset according to the following steps:
as shown in fig. 3 to 8
Disassembling step (1): referring to fig. 3, a pulley block is installed at each bucket hanging point of the cable dome structure, and the total number of the pulley blocks is 8, each pulley block is composed as shown in fig. 6 and 7, and includes two fixed pulleys and two movable pulleys, respectively, a fixed pulley a1, a movable pulley b1, a fixed pulley a2 and a movable pulley b2, the fixed pulley a1 and the fixed pulley a2 are connected together at one hanging point, the movable pulley b1 is connected below the fixed pulley a1, the movable pulley b2 is connected below the fixed pulley a2, a prestressed cable 2 is arranged, one end of the prestressed cable 2 is fixedly connected to a ground anchor 3 embedded in the field below the bucket 1, in this embodiment, the prestressed cable 2 is connected with the ground anchor 3 through an anchor cable joint 4, the other end of the prestressed cable 3 is dispersed into 8 cables through a diffusion disc 5, the other ends of the movable pulley b1 in each pulley block are correspondingly connected, and the other hook of the lower end of the movable hook b2 is correspondingly connected with the hanging point of the bucket 1, the hook at the upper end of each movable pulley of each pulley block is connected with a traction rope, the traction rope sequentially bypasses the corresponding fixed pulley and the movable pulley and then is connected with a traction device 7, namely the movable pulley b1 and the movable pulley b2 are respectively connected with the traction device 7;
disassembling step (2): referring to fig. 4, a cushion 6 is pre-placed on the field under the hopper screen 1, each movable pulley b2 connected with the hopper screen 1 is lowered through a traction device 7, so that the hopper screen 1 descends, the hopper screen 1 contacts the surface of the cushion 6 and starts in a critical state that the hopper screen is not unloaded, a movable pulley b2 connected with the hopper screen 1 gradually removes the weight of the hopper screen 1 attached to the movable pulley b2, the weight of the hopper screen 1 is transferred to the cushion 6, and meanwhile, another movable pulley b1 connected with a prestress cable 2 in a pulley block is tightened through the traction device 7, the tension of the traction device 7 is controlled, so that the tension applied to the prestress cable 2 is equal to the weight of the hopper screen transferred to the cushion 6;
in the whole process of removing the hopper screen 1, a force control mode is adopted through the same control system, namely the self-weight unloading amount of the hopper screen 1 in unit time is controlled to be consistent with the tension increment of the prestressed cable 2 in unit time, wherein the unloading amount of the hopper screen 1 can be converted according to the surface sinking displacement of the cushion pad, and the weight of the removed vertical hopper screen and the applied tension of the prestressed cable 2 can be ensured to be consistent synchronously. Because the incidental load of each pulley block is born by the corresponding hanging point, the load of each hanging point can be ensured to be unchanged.
Disassembling step (3): after the bucket screen 1 is completely removed, the lifting hooks of 8 movable pulleys b2 connected with the bucket screen 1 are separated from the suspension point of the bucket screen 1, the movable pulley b1 connected with the prestressed inhaul cable 2 is kept still, so that the prestressed inhaul cable 2 is loaded with a load equivalent to the weight of the bucket screen 1, namely the vertical tension loaded by the prestressed inhaul cable 2 is 50 tons, and finally the bucket screen 1 and the buffer cushion 6 are retracted;
after the bucket screen is repaired and assembled, the process of resetting and installing the bucket screen is shown in figure 5, which comprises the following steps,
resetting step (1): a movable pulley b2 which is arranged in the pulley block in a hollow way and is used for being connected with the bucket screen 1 is lowered, and each suspension point of the bucket screen 1 is correspondingly connected with a lifting hook of each lowered movable pulley b 2;
resetting step (2): the 8 movable pulleys connected with the bucket screen 1 are gradually tightened through a traction device 7, the 8 movable pulleys are gradually added with part of the weight lifted by the bucket screen, the vertical weight added by the last 8 movable pulleys is 6.25 tons, and meanwhile, the movable pulley b1 connected with the prestress guy cable 2 in a pulley block is lowered through the traction device 8, so that the pulling force discharged by the prestress guy cable 2 is equal to the sum of the weights added on the movable pulleys b2 in the lifting process of the bucket screen 1;
resetting step (3): after the bucket screen 1 is completely lifted, 8 movable pulleys b2 connected with the bucket screen 1 gradually rise to a specified height, then the suspension points of the bucket screen 1 are connected with the suspension points of a cable dome structure, the other 8 movable pulleys b1 connected with the prestressed inhaul cable 2 are gradually lowered to the ground, and then the prestressed inhaul cable 2 is detached.
As a preferred embodiment:
as shown in fig. 3 to 5, the cable dome structure is provided with a backing plate 8, the backing plate 8 is provided with a plurality of traction devices 7 corresponding to the number of the pulley blocks, the traction devices 7 are double-drum winches with hydraulic jacks, as shown in fig. 8, one of the drums is driven by a self-contained motor and is provided with a first traction rope 7a, the first traction rope 7a pulls a movable pulley b2 to lift the screen 1, the other drum is provided with a second traction rope 7b, the second traction rope 7b is clamped by a second traction rope fixing joint 7d on the movable clamping plate 7c, this movable clamp plate 7c is taken on hydraulic jack 7e acts on the head, can drive receiving and releasing of second haulage rope 7b through the flexible of acting on the head, realizes by hydraulic jack 7e drive control connection the pulling force of prestressing force cable 2 on movable pulley b1, and hydraulic jack 7e can accurate control prestressing force cable 2's pulling force.
The cushion pad 6 is a cushion pad with a built-in spring, the cushion pad 6 needs to have enough rigidity and height to prolong the unloading process of the bucket screen 1, so that the unloading amount of the bucket screen can be obtained according to the conversion of the surface sinking displacement of the cushion pad 6, and therefore enough operation time is reserved for the process that the hydraulic jack 7e stretches the prestressed inhaul cable 2 to synchronously attach the pulling force for unloading the equivalent bucket screen to the movable pulley, and the phenomenon that the hanging load on a hanging point is changed violently due to instant unloading when the bucket screen is in direct contact with the ground is avoided.
As shown in fig. 6 and 7, in the pulley block, a hook at the upper end of the movable pulley is connected with a traction rope, and the traction rope is connected with a traction device 7 after sequentially passing through the fixed pulley and the movable pulley.
The above-mentioned embodiments are merely preferred embodiments of the present invention, but should not be construed as limiting the invention, and any variations and modifications based on the concept of the present invention should fall within the scope of the present invention, which is defined by the claims.
Claims (5)
1. The detachable reset design method applied to the scoop screen in the large-span cable dome structure is characterized in that: the bucket screen disassembling process comprises the following steps,
disassembling step (1): a group of pulley blocks are installed at each bucket screen hanging point of a cable dome structure, each pulley block comprises two fixed pulleys and two movable pulleys which are fixed into a whole, the fixed pulleys are connected to the hanging points, the two movable pulleys are connected below the corresponding fixed pulleys, a prestressed guy cable is arranged, one end of the prestressed guy cable is fixedly connected to a ground anchor embedded in a field below the bucket screen, the other end of the prestressed guy cable is dispersed into a plurality of guy cables through a diffusion disc, the dispersed guy cables are respectively and correspondingly connected with a hook at the lower end of one movable pulley in each pulley block, a hook at the lower end of the other movable pulley of each pulley block is correspondingly connected with a hanging point of the bucket screen, and the movable pulleys of each pulley block are respectively connected with a traction device;
disassembling step (2): placing a cushion pad in advance on the field below the hopper screen, lowering each movable pulley connected with the hopper screen through the traction device to enable the hopper screen to descend, gradually unloading the weight of the hopper screen attached to the movable pulley by the movable pulley connected with the hopper screen from the critical state that the hopper screen is in contact with the surface of the cushion pad and is not unloaded, transferring the weight of the hopper screen to the cushion pad, and simultaneously tightening the other movable pulley connected with a prestress cable in the pulley block through the traction device to control the tension of the traction device so that the tension applied to the prestress cable is equal to the weight of the hopper screen transferred to the cushion pad;
disassembling step (3): after the hopper screen is completely removed, a lifting hook of a movable pulley connected with the hopper screen is separated from a suspension point of the hopper screen, and the movable pulley connected with a prestressed inhaul cable is kept still, so that the prestressed inhaul cable loads a load equivalent to the weight of the hopper screen;
the reset installation process of the bucket screen comprises the following steps,
resetting step (1): lowering a movable pulley which is arranged in the pulley block in a hollow way and is used for being connected with the hopper screen, and correspondingly connecting each suspension point of the hopper screen with a lower end lifting hook of each lowered movable pulley;
resetting step (2): the movable pulleys connected with the hopper screen are gradually tightened through the traction device, the movable pulleys are gradually added with part of the weight lifted by the hopper screen, and meanwhile, the movable pulleys connected with the prestressed stay cables in the pulley block are placed downwards through the traction device, so that the pulling force removed by the prestressed stay cables is equal to the sum of the weights of the movable pulleys added in the process of lifting the hopper screen;
resetting step (3): after the bucket screen is completely lifted, the movable pulley connected with the bucket screen gradually rises to a specified height, then the suspension point of the bucket screen is connected with the suspension point of the cable dome structure, the movable pulley connected with the prestressed inhaul cable is gradually lowered to the ground, and then the prestressed inhaul cable is detached.
2. The detachable reset design method of the scoop screen applied to the large-span cable dome structure according to claim 1, wherein: each pulley block is connected with a traction device, the traction device is a double-drum winch with a hydraulic jack, one drum is driven by a self-contained motor to pull a movable pulley to enable the bucket screen to lift, and the other drum is driven by the hydraulic jack to control the tension of the prestress stay cable connected with the movable pulley.
3. The detachable reset design method of the scoop screen applied to the large-span cable dome structure according to claim 2, characterized in that: and a base plate is arranged on the cable dome structure, and a plurality of traction devices corresponding to the pulley block in number are arranged on the base plate.
4. The detachable reset design method of the scoop screen applied to the large-span cable dome structure according to claim 1, wherein: the buffer pad is a buffer pad with a built-in spring.
5. The detachable reset design method of the scoop screen applied to the large-span cable dome structure according to any one of claims 1 to 4, characterized in that: in the pulley block, a hook at the upper end of each movable pulley is connected with a traction rope, and the traction rope sequentially bypasses the corresponding fixed pulleys and the movable pulleys and then is connected with the traction device.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011481743.7A CN112523413B (en) | 2020-12-16 | 2020-12-16 | Detachable reset design method applied to scoop screen in large-span cable dome structure |
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| CN202011481743.7A CN112523413B (en) | 2020-12-16 | 2020-12-16 | Detachable reset design method applied to scoop screen in large-span cable dome structure |
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| JP2004339854A (en) * | 2003-05-19 | 2004-12-02 | Tomoe Corp | Building method for cable dome roof |
| CN103590489B (en) * | 2013-11-03 | 2016-01-06 | 苏州金螳螂建筑装饰股份有限公司 | Super large stained glass dome structure |
| CN103790390B (en) * | 2014-03-06 | 2015-11-18 | 中国建筑第二工程局有限公司 | The glass plate Lift-on/Lift-off System of large-span domes Glass Curtain Wall Construction and construction method thereof |
| CN104763091B (en) * | 2015-03-18 | 2017-07-07 | 上海市建筑装饰工程集团有限公司 | The netted ceiling system of large span and its installation method |
| CN106081870B (en) * | 2016-08-12 | 2017-09-22 | 河北省电力建设第一工程公司 | A kind of nuclear power station steel dome balances hanging method |
| CN106081871B (en) * | 2016-08-12 | 2017-09-22 | 河北省电力建设第一工程公司 | A kind of nuclear power station steel dome balances hanging apparatus |
| CN106988227A (en) * | 2017-05-10 | 2017-07-28 | 中交第四公路工程局有限公司 | A kind of suspension bridge steel truss girder rotary body device and construction method |
| CN109371854B (en) * | 2018-10-17 | 2020-02-04 | 中交二航局第二工程有限公司 | Method for constructing large-span suspension bridge stiffening beam by cable crane |
| CN209038922U (en) * | 2018-10-31 | 2019-06-28 | 甘肃一安建设科技集团有限公司 | Large-span glass hanging device |
| CN109488038B (en) * | 2018-11-27 | 2020-11-27 | 北京市建筑工程研究院有限责任公司 | Method for installing beam string flexible inhaul cable spanning existing building |
| CN111219574A (en) * | 2020-01-16 | 2020-06-02 | 江西海若智能家居有限公司 | Dome type LED display screen and using method thereof |
| CN111997378A (en) * | 2020-08-11 | 2020-11-27 | 陕西建工机械施工集团有限公司 | Fixed-point rotation follow-up method for circular structure |
| CN214006145U (en) * | 2020-11-25 | 2021-08-20 | 河北美创新材料科技有限公司 | Connecting piece and built-in self-insulation cast-in-place concrete system |
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