CN112523414A - Bucket screen installation design method applied to large-span rigid roof cable dome structure - Google Patents
Bucket screen installation design method applied to large-span rigid roof cable dome structure Download PDFInfo
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- CN112523414A CN112523414A CN202011485994.2A CN202011485994A CN112523414A CN 112523414 A CN112523414 A CN 112523414A CN 202011485994 A CN202011485994 A CN 202011485994A CN 112523414 A CN112523414 A CN 112523414A
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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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- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Conveying And Assembling Of Building Elements In Situ (AREA)
Abstract
The invention discloses a method for installing and designing a bucket screen applied to a large-span rigid roof cable dome structure, which comprises the following steps of S1: designing reserved bearing points by using a cable dome structure, preliminarily setting all suspension point position schemes suitable for suspending the bucket screen, equivalently using the self weight of the bucket screen as node load, averagely distributing all suspension points of each suspension point position scheme, and performing finite element analysis on cable dome structure models using different suspension point position schemes; s2: selecting a proper position scheme of the hanging points of the bucket screen according to the key node displacement and the internal force information of key components of various hanging point position schemes; s3: a prestressed stay cable system is preset before the bucket screen is installed, so that the tension of the prestressed stay cable after being tensioned is equivalent to the dead weight of the bucket screen; s4: and controlling the self-weight loading amount of the bucket screen in unit time to be consistent with the tension reduction amount of the prestressed cable in unit time until the bucket screen is completely lifted. The invention provides a reference basis for the design of a related flexible tension cable structure system with a bucket screen.
Description
Technical Field
The invention relates to an installation design method of a large-scale bucket screen in the field of buildings such as stadiums, in particular to an installation design method of a bucket screen applied to a large-span rigid roof cable dome structure.
Background
The LED display screen is used as an important medium for information distribution in modern society, and is rapidly developed in recent years. At present, in large stadiums at home and abroad, an LED screen has become the mainstream as a novel display device. The LED screen is placed in a large stadium and is generally positioned at an inclined stand or at the center of the stadium, the center of the stadium is divided into ground placement and air suspension, and the suspended center LED screen is called a 'bucket screen' because the suspended center LED screen is similar to a funnel in shape. The LED display system can complete various tasks such as wonderful instant capture, peculiar shot playback, real-time live broadcast synchronization, race condition information broadcasting, timing and scoring statistics, advertisement broadcasting and the like in a match, so that the LED display system is widely applied to more and more match venues. It can be seen from the survey of the engineering examples of the application of the fighting screens in the stadiums at home and abroad at present, the structural systems of most of the stadiums in which the hanging fighting screens are applied are rigid steel roof component systems, such as a grid structure, a reticulated shell structure, a truss structure, a suspended dome structure and the like, the fighting screens are rarely applied to flexible tension structural systems such as a cable dome structure, and the installation design methods of the relevant fighting screens in the flexible structures are rare. In the actual construction and installation process of the cable dome structure, firstly, tensioning of cable members is carried out, prestress is generated by tensioning to form structural rigidity, then construction of a metal roof and decoration ceiling construction are carried out, and the installation of the bucket screen structure is generally located after the construction is finished. Because the cable dome structure system is limited by the structural characteristics of the cable dome structure system, the cable dome structure system has high requirement on the load acting on the cable dome structure system and is sensitive to the internal force of a cable member, the weight of the bucket screen structure is large, the self weight of the bucket screen can reach dozens of tons, the internal force of the cable member can change in the installation process of the bucket screen, meanwhile, the bucket screen is hung at different hanging points on the cable dome structure, so that the influence on the distribution of the internal force of the cable member is large, partial cable can be loosened, the geometric stress rigidity built by the internal prestress of the cable system can be reduced, the safety of the whole cable dome structure can be seriously threatened, and measures are needed to be taken to ensure that the internal force of the cable member is kept unchanged in.
The common hanging points for hanging the bucket screen are arranged on a rigid steel roof component, the position design research of the hanging points for hanging the bucket screen in a flexible stretched guy cable dome structure is relatively insufficient, meanwhile, the measure for solving the problem of cable force change in the installation process of the bucket screen is that additional counterweights such as buckets or sandbags and the like are adopted to equal the weight of the bucket screen in the installation process of a roof, and the internal force of the cable component is ensured to be unchanged by gradually removing the buckets or the sandbags and the like in the process of installing the bucket screen.
Disclosure of Invention
The invention provides a method for installing and designing a bucket screen applied to a large-span rigid roof cable dome structure, which can provide reference basis for the design of a related flexible tension cable structure system containing the bucket screen.
In order to achieve the purpose, the invention adopts the following scheme:
a method for installing and designing a bucket screen applied to a large-span rigid roof cable dome structure comprises the following steps,
s1: determining the size and weight of a screen of a bucket screen according to building function requirements, designing reserved bearing points by using a cable dome structure, preliminarily determining all suspension point position schemes suitable for suspending the bucket screen, equivalently using the self weight of the bucket screen as node load, averagely distributing all suspension points in each suspension point position scheme, carrying out finite element analysis on cable dome structure models using different suspension point position schemes, and extracting information of key node displacement and member internal force in the cable dome structure using different suspension point position schemes based on finite element analysis results;
s2: according to key node displacement and key component internal force information of various hanging point position schemes, a proper bucket screen hanging point position scheme is selected through comparison and analysis;
s3: in order to ensure that the internal force of a cable component is unchanged in the installation process of the hopper screen, a prestressed inhaul cable system is preset before the hopper screen is installed, so that the tension of the prestressed inhaul cable after being tensioned is equivalent to the dead weight of the hopper screen;
s4: in the installation process of the bucket screen, the self-weight loading amount of the bucket screen in unit time is controlled to be consistent with the pulling force reduction amount of the prestressed stay cable in unit time until the bucket screen is completely lifted;
s5: and lifting the bucket screen to a specified position, disconnecting the unloaded prestressed stay cable, and recovering the prestressed stay cable.
The invention balances the load of the hopper screen through the prestressed cable system, accurately controls the tension of the prestressed cable in the installation process of the hopper screen and ensures that the internal force of a cable component on the cable dome is unchanged.
The invention also has the following preferred design:
the prestressed inhaul cable system comprises a prestressed inhaul cable and an anchoring structure, wherein the prestressed inhaul cable is connected with a hanging point, the lower end of the prestressed inhaul cable is connected with the anchoring structure which is embedded in a field below a hopper screen, and the pulling force of the prestressed inhaul cable is gradually reduced under the control of a post-assembled unloading device during the installation of the hopper screen.
The unloading device comprises a fixed plate, an upper base plate, a jack and a cable clamp plate, wherein the fixed plate is fixedly connected with the anchoring structure, the fixed plate is connected with the upper base plate through a screw rod, the cable clamp plate is positioned between the fixed plate and the upper base plate, and the jack for adjusting the distance between the cable clamp plate and the upper base plate is arranged between the upper base plate and the cable clamp plate.
The other unloading device comprises a fixed plate, a cable clamp plate and a screw rod, wherein the fixed plate is fixedly connected with the anchoring structure, the fixed plate is connected with the cable clamp plate through the screw rod, the upper surface of the cable clamp plate is abutted with a movable nut on the screw rod, and the distance between the cable clamp plate and the fixed plate is adjusted through the movable nut.
In the prestressed inhaul cable system, one prestressed inhaul cable connected with the anchoring structure is dispersed into a plurality of inhaul cables through the anchor cable diffusion disc to be connected with corresponding hanging points above the inhaul cables.
In the steps S4 and S5, a remote-controlled winch or an electric hoist is used as the hoisting equipment of the bucket screen.
The invention has the following beneficial effects:
(1) the invention provides a mounting design method of a hopper screen for a rare large-span flexible tension cable dome structure system, which can accurately control and cancel the pulling force in a prestressed cable through a post-assembled unloading device to ensure that the internal force of a cable component is unchanged in the mounting process of the hopper screen, reduce the construction error, improve the construction quality and solve the problem of lower safety and accuracy in the traditional measure of canceling the additional balance weight.
(2) The bucket screen installation process can mainly depend on remotely controllable hoisting equipment and a ground unloading device, and does not need to depend on too much manpower to carry out high-altitude operation, so that the difficulty of engineering safety management is reduced, the construction efficiency and the operability are improved, the economic benefit is remarkable, and the bucket screen installation process is easy to popularize and use in actual engineering.
(3) The method can optimize and design the position scheme of the hanging points of the bucket screen suspension through finite element analysis, and effectively ensure the safety and reliability of the structure after the bucket screen is installed.
(4) The method can be applied to the installation design of the hopper screen in a large-span flexible stretched cable dome structure system, and can also provide reference for the installation design and application of the hopper screen in other large-span roof structure systems.
Drawings
FIG. 1 is a simplified model of a cable dome structure;
FIG. 2 is a block diagram of a suspended bucket screen;
FIG. 3 is a schematic diagram of a position scheme of a screen hanging point on a cable dome structure according to the first embodiment and the second embodiment;
FIG. 4 is a perspective view of key node positions of the cable dome structure according to the first and second embodiments;
FIG. 5 is a top view of the key nodal locations of the cable dome structure according to one embodiment;
FIG. 6 is an elevational view of a key cable member of the cable dome structure according to one or more embodiments;
FIG. 7 is a schematic view showing the connection between the suspending point and the prestressed stay of the first and second mid-cable dome structures according to the first and second embodiments;
FIG. 8 is an installation schematic diagram of the first embodiment when the bucket screen is hoisted.
FIG. 9 is a schematic view of an unloading apparatus according to one embodiment.
Fig. 10 is an installation schematic diagram of the second embodiment when the bucket screen is hoisted.
FIG. 11 is a schematic view of an unloading apparatus according to a second embodiment.
Description of reference numerals:
1-fighting screen; 2-inner pull ring; 3-inner ring cable; 4-middle becket; 5-outer ring cable; 6-a first node; 7-a second node; 8-spinal cord; 9-spinal cord; 10-spinal chord; 11-a support bar; 12-an anchoring structure; 13-fixing the cable head; 14-a prestressed stay; 15-anchor cable diffusion disc; 16-an unloading device; 17-hoisting equipment; 18-a fixed plate; 19-cable cleat; 20-a screw; 21-upper backing plate; 22-jack; 23-movable nut.
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.
Example one
In this embodiment, only the following working conditions are applied as an example, that is, the constant load is the dead weight of each member of the cable dome structure + the roof load (including the sidewalk), the cable member applies the prestress, the model calculation is performed according to the working conditions of the prestress + the constant load, and finally the bucket screen installation is performed according to the method of the present invention, the steps are as follows:
s1: establishment of finite element analysis model
Establishing a finite element analysis model of a cable dome structure without a suspended bucket screen without considering the influence of the dead weight of the bucket screen by using Midas software, determining the size and the weight of a screen of the bucket screen according to the building function requirement, designing reserved bearing points by using the cable dome structure, preliminarily determining all suspension point position schemes suitable for the suspended bucket screen, equating the dead weight of the bucket screen to be node load, averagely distributing the node load to all suspension points in each suspension point position scheme, carrying out finite element analysis on the cable dome structure models using different suspension point position schemes, extracting the information of key node displacement and member internal force in the cable dome structure applying different suspension point position schemes based on the finite element analysis result, carrying out shape-finding stress analysis on the cable dome structure as shown in figure 1, wherein the stress analysis comprises stress calculation in a prestressed state and a loaded state, and confirming that the dome cable dome structure meets the stress performance requirement, while obtaining the initial state and response of the cable dome structure.
S2: determination of position scheme of hanging point of hopper screen
And evaluating according to the key node displacement and key member internal force information of various hanging point position schemes, and selecting a proper bucket screen hanging point position scheme by comparison analysis according to the building design requirements.
The structure of a bucket screen 1 in the embodiment is shown in fig. 2, the weight is 50 tons, all hanging point position schemes suitable for hanging the bucket screen are preliminarily determined according to the layout of a roof cable rod system and by utilizing reserved bearing points designed by a cable dome structure, as shown in fig. 3, 8 hanging points are respectively arranged on an inner pull ring 2, an inner ring cable 3, a middle ring cable 4 and an outer ring cable 5, four hanging point position schemes are formulated for hanging the bucket screen, the self weight of the bucket screen is equivalent to node load and is averagely distributed to the 8 hanging points, finite element analysis is carried out on cable dome structure models using different hanging point position schemes, and information of key node displacement and component internal force in the cable dome structure applying different hanging point position schemes is extracted based on finite element analysis results; in this embodiment, since the displacement of the inner ring node and the change of the internal force of the ridge cord are large, the first node 6 and the second node 7 shown in fig. 4 and 5 are taken as key nodes, the inner ridge cord 8, the middle ridge cord 9 and the outer ridge cord 10 shown in fig. 6 are taken as key cord members, and the analysis results are shown in tables 1 and 2,
TABLE 1 Key node Displacement (Unit mm)
Note: the intersection point of the inner ridge cable 8 and the supporting rod 11 on the inner pull ring 2 is taken as a first node 6, and the intersection point of the middle ridge cable 9 and the supporting rod 11 on the inner ring cable 3 is taken as a second node 7 as shown in fig. 5.
TABLE 2 internal force of key cable component
According to the information in tables 1 and 2, it can be analyzed that when the hanging point is arranged on the inner pull ring 2, the influence on the displacement of the key node, the internal force of the inner ridge cable 8 and the internal force of the middle ridge cable 9 is the largest, the displacement of the key node is increased by 165%, the cable force of the cable member is reduced by 21%, and when the hanging point is arranged on the outer ring cable 5, the influence on the displacement of the key node and the internal force of the cable member is the smallest.
The analysis result shows that even if the hanging points are arranged on the inner pull ring, the adverse effect is the largest, but the cable members are not loosened, any hanging point scheme can be adopted according to the design requirement, and the scheme that the hanging points are arranged on the inner pull ring is comprehensively considered in the embodiment.
S3: arrangement of prestressed cables
After the hanging point position scheme of the hopper screen is determined, as shown in fig. 7, a prestressed stay cable system is preset before the hopper screen is installed, so that the tension of the prestressed stay cable after being tensioned is equivalent to the self weight of the hopper screen;
the method is realized by the following steps:
as shown in fig. 7 to 9, the prestressed cable system includes a prestressed cable 14 connected to a hanging point and an anchoring structure 12, a lower end of the prestressed cable 14 is connected to the anchoring structure 12 pre-buried in a place below the bucket screen 1 through a fixed cable head 13, and the tension of the prestressed cable is gradually reduced under the control of a post-assembled unloading device 16 when the bucket screen 1 is installed.
The tensioning construction stage of the prestressed stay cable 14 and the tensioning construction stage of a cable member of a cable dome structure are synchronously carried out, 8 stay cables are dispersed from the upper end of the prestressed stay cable 14 through an anchor cable diffusion disc 15 and are connected with 8 hanging points above the prestressed stay cable, the self weight of the bucket screen 1 is equivalent by using the tensioning force of the prestressed stay cable 14, namely the vertical component force of the upper 8 prestressed stay cables is respectively equal to the self weight of the bucket screen, and the internal force of the cable member is ensured to be unchanged in the installation process of the bucket screen;
s4: installation and construction of bucket screen
In the installation process of the bucket screen, as shown in fig. 8, firstly, an unloading device 16 is assembled on the ground, as shown in fig. 9, the unloading device 16 comprises a fixing plate 18, a cable clamp plate 19, an upper backing plate 21 and a jack 22, the fixing plate 18 is used for being fixedly connected with the anchoring structure 12, the fixing plate 18 is connected with the upper backing plate 21 through a screw 20, the cable clamp plate 19 is positioned between the fixing plate 18 and the upper backing plate 21, the jack 22 for adjusting the distance between the cable clamp plate 19 and the upper backing plate 21 is arranged between the upper backing plate 21 and the cable clamp plate 19, wherein the cable clamp plate 19 is used for clamping the prestressed cable 14, the action head of the jack 22 extends out to a distance enough to shorten the elongation of the cable to be against the cable clamp plate 19, then the structure of the bucket screen 1 is assembled on the ground, the prestressed cable 14 and the unloading device 16 can pass through the structural center of the bucket screen 1, then, the remotely-controllable hoisting equipment, connecting a steel wire rope of a hoisting device 17 with a hoisting point of the bucket screen 1, dismounting a fixed cable head 13 in the process of gradually hoisting the bucket screen 1, and then retracting an action head of a jack 22 to enable a cable clamp plate 19 to be driven by a prestressed cable 14 to move upwards along the length direction of a screw rod 20 to control the length of the prestressed cable 14 to be shortened, so that the self-weight loading amount of the bucket screen 1 in unit time is controlled to be consistent with the tension reduction amount of the equivalent cable length reduction amount in the prestressed cable in unit time until the bucket screen 1 is completely hoisted;
s5: the bucket screen 1 is lifted to a specified position, the unloaded prestressed inhaul cable is disconnected with the anchoring structure, and the prestressed inhaul cable is pulled and recovered through the upper hoisting equipment.
The hoisting device 17 in this embodiment may be a remotely controllable hoist or electric block.
Example two
The first three steps of the embodiment, namely establishment of a finite element analysis model and determination of a position scheme of a screen hanging point of the hopper, are the same as those of the first embodiment.
The difference between the second embodiment and the first embodiment is that different unloading devices 16 are adopted to control and cancel the tension of the prestressed cable in the bucket screen installation construction stage.
The installation process of the bucket screen of the embodiment is shown in fig. 10, firstly, the unloading device 16 is assembled on the ground, and the unloading device 16 is shown in fig. 11 and comprises a fixing plate 18, a cable clamp plate 19 and a screw rod 20, wherein the fixing plate 18 is used for fixedly connecting with the anchoring structure 12, the fixing plate 18 is connected with the cable clamp plate 19 through the screw rod 20, the upper surface of the cable clamp plate 19 is abutted against a movable nut 23 on the screw rod 20, and the distance between the cable clamp plate 19 and the fixing plate 18 is adjusted through the movable nut 23.
Wherein the cable clamp plate 20 clamps the prestressed cable 14, the movable nut 23 supports against the cable clamp plate 19, the upper end of the screw rod 20 is provided with a length enough for shortening the elongation of the cable so that the movable nut 23 can move upwards along the screw rod 20, then the bucket screen 1 is assembled on the ground, the prestressed cable 14 and the unloading device 16 can pass through the center of the bucket screen structure, then the remote-controllable hoisting equipment 17 fixed at the upper hoisting point is utilized to connect the steel wire rope of the hoisting equipment 17 with the hoisting point of the bucket screen 1, in the process of gradually hoisting the bucket screen 1, the fixed cable head 13 is firstly disassembled, then the movable nut 23 is controlled to move upwards along the screw rod 20 through the hydraulic torque wrench, the cable clamp plate 19 is driven by the prestressed cable 14 to move upwards along the length direction of the screw rod 20 so as to control the shortening of the length of the prestressed cable 14, and therefore the self-weight loading amount of the bucket screen 1 in unit time is controlled to be consistent with the tensile force reduction amount of the equivalent cable length in the prestressed cable in unit time Starting; and similarly, the bucket screen 1 is lifted to a specified position, the unloaded prestressed stay cable 14 is disconnected with the anchoring structure 12, and the prestressed stay cable 14 is pulled and retracted through the upper hoisting equipment 17.
In summary, it can be seen that the implementation method of the second embodiment is simple, but the actual operation of the first embodiment is reliable in the hoisting of the bucket screen with an ultra-large weight.
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 (6)
1. The utility model provides an use in large-span rigid roofing cable dome structure fill screen installation design method which characterized in that: comprises the following steps of (a) carrying out,
s1: determining the size and weight of a screen of a bucket screen according to building function requirements, designing reserved bearing points by using a cable dome structure, preliminarily determining all suspension point position schemes suitable for suspending the bucket screen, equivalently using the self weight of the bucket screen as node load, averagely distributing all suspension points in each suspension point position scheme, carrying out finite element analysis on cable dome structure models using different suspension point position schemes, and extracting information of key node displacement and member internal force in the cable dome structure using different suspension point position schemes based on finite element analysis results;
s2: according to key node displacement and key component internal force information of various hanging point position schemes, a proper bucket screen hanging point position scheme is selected through comparison and analysis;
s3: in order to ensure that the internal force of a cable component is unchanged in the installation process of the hopper screen, a prestressed inhaul cable system is preset before the hopper screen is installed, so that the tension of the prestressed inhaul cable after being tensioned is equivalent to the dead weight of the hopper screen;
s4: in the installation process of the bucket screen, the self-weight loading amount of the bucket screen in unit time is controlled to be consistent with the pulling force reduction amount of the prestressed stay cable in unit time until the bucket screen is completely lifted;
s5: and lifting the bucket screen to a specified position, disconnecting the unloaded prestressed stay cable, and recovering the prestressed stay cable.
2. The installation design method of the scoop screen applied to the large-span rigid roof cable dome structure according to claim 1, wherein the method comprises the following steps: the prestressed inhaul cable system comprises a prestressed inhaul cable and an anchoring structure, the prestressed inhaul cable is connected with a hanging point, the lower end of the prestressed inhaul cable is connected with the anchoring structure, the anchoring structure is embedded in a field below the hopper screen, and the pulling force of the prestressed inhaul cable is gradually reduced under the control of an unloading device which is assembled later when the hopper screen is installed.
3. The installation design method of the scoop screen applied to the large-span rigid roof cable dome structure according to claim 2, characterized in that: the unloading device comprises a fixed plate, an upper base plate, a jack and a cable clamp plate, wherein the fixed plate is fixedly connected with the anchoring structure, the fixed plate is connected with the upper base plate through a screw rod, the cable clamp plate is located between the fixed plate and the upper base plate, and the jack used for adjusting the distance between the cable clamp plate and the upper base plate is arranged between the upper base plate and the cable clamp plate.
4. The installation design method of the scoop screen applied to the large-span rigid roof cable dome structure according to claim 2, characterized in that: the unloading device comprises a fixed plate, a cable clamp plate and a screw rod, the fixed plate is fixedly connected with the anchoring structure, the fixed plate is connected with the cable clamp plate through the screw rod, the upper surface of the cable clamp plate is abutted to a movable nut on the screw rod, and the distance between the cable clamp plate and the fixed plate is adjusted through the movable nut.
5. The installation design method of the scoop screen applied to the large-span rigid roof cable dome structure according to claim 2, characterized in that: one prestressed cable connected with the anchoring structure in the prestressed cable system is dispersed into a plurality of cables through the anchor cable diffusion disc to be connected with corresponding hanging points above.
6. The installation design method of the scoop screen applied to the large-span rigid roof cable dome structure according to claim 1, wherein the method comprises the following steps: and in the steps S4 and S5, a remote-controlled winch or an electric hoist is used as hoisting equipment of the bucket screen.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114703970A (en) * | 2022-04-08 | 2022-07-05 | 上海建工一建集团有限公司 | Dicyclo cable large-span steel construction |
| CN115075451A (en) * | 2022-08-19 | 2022-09-20 | 北京市建筑工程研究院有限责任公司 | Tension-free construction method for prestressed cable structure |
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| CN112523414B (en) | 2022-11-04 |
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