CN112942661A - Construction method of stay cable with flexible cable net boundary - Google Patents
Construction method of stay cable with flexible cable net boundary Download PDFInfo
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- CN112942661A CN112942661A CN202110056489.4A CN202110056489A CN112942661A CN 112942661 A CN112942661 A CN 112942661A CN 202110056489 A CN202110056489 A CN 202110056489A CN 112942661 A CN112942661 A CN 112942661A
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
Abstract
The invention discloses a construction method of a stay cable with a flexible cable net boundary, which belongs to the technical field of prestressed steel structure construction. The low-altitude installation tensioning tool avoids the danger of high-altitude operation, improves the construction safety, ensures the installation quality of the stay cable, and is favorable for reducing the construction cost.
Description
Technical Field
The invention belongs to the technical field of prestressed steel structure construction, and particularly relates to a construction method of a stay cable with a flexible cable net boundary.
Background
The concept of a cable-stayed bridge in bridge engineering is introduced into a building structure, and various cable-stayed building structures are derived, so that the cable-stayed building structure is a complex large-span space steel structure form. The cable-stayed structure generally comprises a tower column, a stay cable and a suspension body. The stay cable can pull up the flexible cable net through the tower column to form a tension cable-stayed structure. The stay cables increase the clear span of the roof for the suspension structure, and thus the stay cables are often used in buildings such as hangars, stadium roofs, convention and exhibition centers, and the like.
The existing diagonal-pulling structure is generally a rigid roof, the stay cable of the existing diagonal-pulling structure generally adopts a high-altitude installation tensioning tool, the tensioning end is arranged at the end of a tower crane, the high-altitude operation danger is extremely high, and the construction requirement can be met by ultra-large mechanical equipment, so that the existing diagonal-pulling structure is neither safe nor uneconomical.
Disclosure of Invention
The invention aims to provide a construction method of a stay cable with a flexible cable net boundary, which aims to solve the technical problems that the existing stay cable installation method is generally used for rigid roofs, has extremely high risk of overhead operation, can meet construction requirements by needing ultra-large mechanical equipment, and is neither safe nor uneconomical.
In order to solve the technical problem, the invention provides a construction method of a stay cable with a flexible cable net boundary, which comprises the following steps:
s1, preparation work before suspension of the stay cables: deeply designing a cable clamp of a ring cable node, determining a spatial position when the ring cable node is laid, erecting a radial cable support jig frame and a ring cable support jig frame, then laying a radial cable and a ring cable based on the radial cable support jig frame and the ring cable support jig frame, and connecting the radial cable and the ring cable by using the cable clamp;
s2, mounting an anchorage at one end of a stay cable at high altitude: erecting a steel frame platform on the tower top of the tower crane, arranging a movable pulley block hoisting device, and lifting an anchorage device at one end of a stay cable and connecting the anchorage device with an anchoring end of the tower crane;
s3, lifting the anchorage at the other end of the stay cable: and connecting an anchorage at the other end of the stay cable with a ring cable node by using an auxiliary assembling and lifting device of the truck crane, and adopting symmetrical lifting and graded tensioning.
Preferably, the cable clamp comprises a cable clamp body, a ring cable head, a radial cable lug plate, a stay cable lug plate and stay cable auxiliary lug plates, the stay cable auxiliary lug plates are connected to two sides of the stay cable lug plate, and the hole centers of the two stay cable auxiliary lug plates and the hole centers of the stay cable lug plates are located on the same straight line.
Preferably, the method for determining the spatial position of the cable node when laying in S1 is: and drawing a circle by taking the hole center of the ring beam ear plate as the center of a circle and the length of the radial cable as the radius, connecting the hole center of the ring beam ear plate with the high stand edge, and taking the intersection point of the extension line and the circle as the spatial position when the node of the ring cable is laid.
Preferably, the ring cable supporting jig frame and the radial cable supporting jig frame are erected on the stand, the joint of the ring cable supporting jig frame and the radial cable supporting jig frame is a ring cable joint supporting jig frame, the top elevation of the ring cable supporting jig frame is a space position Z coordinate when the ring cable joint is laid, and the height of the radial cable supporting jig frame is equal to the distance between the hole center of the ring beam ear plate and the edge of the high stand.
Preferably, the laying method of the radial cables and the ring cables in the step S1 is as follows:
s11, laying a steel plate platform on a ring cable node supporting jig frame at the connecting node of the ring cable supporting jig frame and the radial cable supporting jig frame, and hoisting the cable releasing disc to the steel plate platform;
s12, installing a winch on the ring beam, connecting a steel wire rope on the winch with a radial cable releasing trolley, connecting a cable head of a radial cable with the radial cable releasing trolley, and drawing the radial cable to be unfolded on a radial cable supporting jig by the winch;
s13, installing the radial cable in place by matching the crawler crane and the winch;
s14, hoisting and placing the cable tray, and hoisting the ring cable node to the steel plate platform;
and S15, connecting the radial cable with the ring cable node, and connecting the ring cable with the ring cable node.
Preferably, before the steel frame platform in S2 is set up, the stress and deformation distribution of the steel frame platform is calculated by finite element software.
Preferably, the movable pulley block hoisting device in S2 includes a winch disposed at the bottom of the tower crane, a fixed pulley fixed at a predetermined hoisting point, a steel wire rope connected between the winch and the fixed pulley, and a movable pulley disposed on the steel wire rope, wherein one end of the steel wire rope is connected to the fixed pulley, and the other end of the steel wire rope sequentially passes through the movable pulley and the fixed pulley and is connected to the winch.
Preferably, the method for lifting an anchorage at one end of a stay cable in S2 includes the steps of:
s21, placing a cable releasing disc at the tower bottom of the tower crane, and fixing an anchorage at one end of the stay cable on a movable pulley;
s22, lifting an anchorage device at one end of the stay cable to the anchor end ear plate of the tower crane, and connecting the anchorage device at one end of the stay cable with the anchor end ear plate of the tower crane;
and S23, suspending the cable releasing disc by the crawler crane, and drawing the anchorage at the other end of the stay cable to be unfolded in the field by the truck crane until the stay cable is completely laid.
Preferably, the arrangement method of the truck crane auxiliary assembly lifting device in the step S3 is as follows: calculating the blanking length of the steel strand through finite element software, assembling the inserting lug, lifting the steel strand, installing the inserting lug to the ring cable node with the corresponding number, and assembling the stay cable tensioning tool and the jack.
Preferably, the symmetrical lifting and graded tensioning method in S3 comprises the following steps:
s31, symmetrically hoisting two ring cable nodes to be separated from the frame body by 2 crane cranes, symmetrically hoisting two stay cable tensioning tools by 2 crawler cranes, pre-tensioning steel strands at the same time until the height of the stay cable tensioning tools is the same as that of the ring cable nodes, and then loosening hooks of the crawler cranes;
s32, continuing to lift the stay cable until the steel strand reaches the calculated theoretical length, and at the moment, releasing the hook by the truck-mounted crane;
s33, repeating S31 and S32, and sequentially starting from the center of the site in a symmetrical mode until two stay cables close to the tower crane are finished, wherein the structures on the east and the west sides are sequentially carried out;
s34, after all the stay cables are lifted, the stay cables are tensioned in a grading manner, and the tensioning length of each grade of steel strand is calculated through finite element software according to an equal proportion synchronous tensioning principle;
and S35, adjusting the cable clamp, installing the pin shaft and finally completing the installation of the stay cable.
Compared with the prior art, the invention has the characteristics and beneficial effects that: the method for installing the stay cable aims at the boundary of the flexible cable net, when the stay cable is installed, after the flexible cable net is assembled on the low-altitude jig frame, the tower crane and the anchor at the upper end of the stay cable are connected, then the tensioning tool is installed in the low altitude, and the anchor at the lower end of the stay cable is tensioned in place. The low-altitude installation tensioning tool avoids the danger of high-altitude operation, improves the construction safety, ensures the installation quality of the stay cable, and is favorable for reducing the construction cost.
Drawings
Fig. 1 is a schematic diagram of construction completion of a stay cable with a flexible cable net boundary.
Fig. 2 is a schematic view of a cord clip.
FIG. 3 is a schematic view of the connection of the cable clamp with the looped cable and the radial cable.
FIG. 4 is a schematic diagram of a method for determining the spatial position of a looped-cable node when laid.
Fig. 5 is a schematic view of a radial cable support jig, a ring cable support jig, and a ring cable node support jig.
FIG. 6 is a first schematic diagram of laying radial cables based on a radial cable support jig.
FIG. 7 is a second schematic diagram of radial cable laying based on a radial cable support jig.
Fig. 8 is a schematic diagram of a steel frame platform built on the top of a tower crane.
Fig. 9 is a schematic view of the movable pulley block hoisting device.
Fig. 10 is a schematic view of lifting the lower anchorage of the stay cable using a truck-mounted auxiliary assembly lifting device.
Fig. 11 is a schematic diagram one of the symmetric lifting and the staged tensioning of the stay cable.
Fig. 12 is a schematic diagram two of the symmetric lifting and the staged tensioning of the stay cables.
Fig. 13 is a third schematic diagram of symmetric lifting and staged tensioning of the stay cables.
The attached drawings are marked as follows: 1-hanging tower, 2-stay cable, 3-flexible cable net, 4-cable clamp, 41-cable clamp body, 42-ring cable head, 43-radial cable lug plate, 44-stay cable lug plate, 45-stay cable auxiliary lug plate, 5-ring beam, 6-ring cable node, 7-steel strand, 8-high stand edge, 9-ring beam lug plate, 10-stay cable tensioning tool, 11-truck-mounted crane, 12-radial cable supporting jig frame, 13-ring cable supporting jig frame, 14-ring cable node supporting jig frame, 15-radial cable releasing trolley, 16-radial cable, 17-cable releasing disc, 18-steel plate platform, 19-winch, 20-steel wire rope, 21-return point tripod, 22-ring cable, 23-steel frame platform, 24-tower crane parapet, 25-embedded part, 26-movable pulley, 27-crawler crane and 28-fixed pulley.
Detailed Description
In order to make the technical means, innovative features, objectives and functions realized by the present invention easy to understand, the present invention is further described below.
The examples described herein are specific embodiments of the present invention, are intended to be illustrative and exemplary in nature, and are not to be construed as limiting the scope of the invention. In addition to the embodiments described herein, those skilled in the art will be able to employ other technical solutions which are obvious based on the disclosure of the claims and the specification of the present application, and these technical solutions include technical solutions which make any obvious replacement or modification for the embodiments described herein.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The cable-stayed structure generally comprises a tower column, a stay cable and a suspension body, wherein the suspension body can be a rigid roof structure such as a net rack, an arch structure, a rigid beam, a steel truss and the like, and can also be a flexible cable structure.
Aiming at a cable-stayed structure with a suspension body of a flexible cable net, the installation method of the stay cable is mainly divided into two ideas: one method is to assemble a flexible cable net on a low-altitude jig frame, then connect the flexible cable net and an anchorage at the lower end of a stay cable, install a tensioning tool at high altitude, and tension the anchorage at the upper end of the stay cable in place (the tensioning end is a rigid boundary condition). And the other method is that after the flexible cable net is assembled on the low-altitude jig frame, the hoisting tower and the anchorage at the upper end of the stay cable are connected, then a tensioning tool is installed in the low altitude, and the anchorage at the lower end of the stay cable is tensioned in place (at the moment, the tensioning end is in a flexible boundary condition).
The invention adopts a second idea to construct the stay cable with the flexible cable net boundary. As shown in figure 1, the flexible cable net 3 comprises radial cables 16 and ring cables 22, and the radial cables 16 and the ring cables 22 are connected through cable clamps 4. The joint of the radial cable 16 and the ring cable 22 is a ring cable node 6. One end of the radial cable 16 is connected with the ring beam ear plate 9 at the top end of the ring beam 5. The lower end of the stay cable 2 is connected with a ring cable node 6, and the upper end is connected with an anchoring end ear plate of the tower crane 1.
A construction method of a stay cable with a flexible cable net boundary comprises the following steps:
1. preparation work before suspension of stay cable 2
The method comprises the steps of deeply designing a cable clamp 4 of a ring cable node 6, determining a space position when the ring cable node 6 is laid, setting up a radial cable support jig 12 and a ring cable support jig 13, then laying a radial cable 16 and a ring cable 22 based on the radial cable support jig 12 and the ring cable support jig 13, and connecting the radial cable 16 and the ring cable 22 by the cable clamp 4.
1.1, deeply designing a cable clamp 4 of a ring cable node 6
As shown in fig. 2 and 3, the cable clamp 4 includes a cable clamp body 41, a loop cable head 42, a radial cable lug plate 43, a stay cable lug plate 44 and stay cable auxiliary lug plates 45, the stay cable auxiliary lug plates 45 are connected to both sides of the stay cable lug plate 44, and the hole centers of the two stay cable auxiliary lug plates 45 and the hole centers of the stay cable lug plates 44 are located on the same straight line. And (4) adopting finite element calculation software to perform stress analysis.
1.2, determining the spatial position of the ring cable node 6 when the ring cable node is laid
And (3) intercepting a cross-sectional view of each cable truss through BIM software, as shown in figure 4, drawing a circle by taking the hole center of the ring beam ear plate 9 as the center of a circle and the length of the radial cable 16 as the radius, connecting the hole center of the ring beam ear plate 9 with the high stand edge 8, wherein the intersection point of the extension line and the circle is the spatial position when the ring cable node 6 is laid.
1.3, building a radial cable supporting jig frame 12 and a ring cable supporting jig frame 13
As shown in fig. 5, the looped cable support jig 13 and the radial cable support jig 12 are both erected on a stand, a looped cable node support jig 14 is arranged at a connection node of the looped cable support jig 13 and the radial cable support jig 12, the top elevation of the looped cable support jig 13 is a space position Z coordinate when the looped cable node is laid, and the width of the looped cable support jig 13 is calculated according to the requirement of the height-to-width ratio of the frame body. The height of the radial cable supporting jig frame 12 is equal to the distance between the hole center of the ring beam ear plate 9 and the high stand edge 8. And calculating the width of the radial cable supporting jig frame 12 according to the requirement of the height-to-width ratio of the frame body. The vertical bearing capacity of the ring cable node supporting jig frame 14 needs to be ensured at the ring cable node 6, and in order to ensure the safety of the stand, a countertop measure can be carried out below the stand of the ring cable node supporting jig frame 14.
1.4 laying radial 16 and hoop 22 cords
1.4.1, as shown in fig. 6 and 7, a steel plate platform 18 is laid on the ring cable node supporting jig 14 at the connection node of the ring cable supporting jig 13 and the radial cable supporting jig 12, and the cable releasing disc 17 is hung on the steel plate platform 18.
1.4.2, a winch 19 and a return point tripod 21 are arranged on the ring beam 5, a steel wire rope 20 on the winch 19 penetrates through the return point tripod 21 and is connected with the radial cable paying-off trolley 15, a cable head of the radial cable 16 is connected with the radial cable paying-off trolley 15, and the winch 19 pulls the radial cable 16 to be unfolded on the radial cable supporting jig 12.
1.4.3, installing the radial cables 16 in place using the crawler 27 and the winch 19 in cooperation.
And 1.4.4, hoisting and placing the cable disc 17, and hoisting the ring cable joint 6 to a steel plate platform 18. In order to reduce the horizontal thrust of the inclined stay cable 2 on the frame body, round steel is arranged between the steel plate platform 18 and the cable clamp 4 in a cushioning mode, and the rolling friction between the cable clamp 4 and the steel plate platform 18 is reduced.
1.4.5, connecting the radial cable 16 with the annular cable node 6, and connecting the annular cable 22 with the annular cable node 6. Specifically, the radial cables 16 and the ring cable nodes 6 are connected through temporary steel frames and chain blocks, and the ring cables 22 and the ring cable nodes 6 are connected through chain tongs.
2. Anchor for mounting one end of stay cable 2 at high altitude
A steel frame platform 23 is erected on the top of the tower crane 1, a movable pulley block hoisting device is arranged, and an anchorage device at one end of the stay cable 2 is lifted and connected with an anchoring end of the tower crane 1.
2.1 erecting a steel frame platform 23 on the top of the tower crane 1
The tower top of the tower crane 1 is provided with a tower crane parapet 24, and the top of the tower crane parapet 24 is provided with a steel frame platform 23. Before the steel frame platform 23 is erected, the stress and deformation distribution of the steel frame platform 23 is calculated through finite element software. The steel frame platform 23 is completely set up as shown in fig. 8. The steel frame platform 23 is used for providing a hoisting point for a steel wire rope of the winch and providing a reaction point for the chain block. And after being integrally welded, the steel frame platform 23 is lifted to the position of the embedded part 25 on the top of the tower crane 1 and welded.
2.2, set up running block hoist device
As shown in fig. 9, the movable pulley block hoisting device includes a hoisting machine 19 disposed at the bottom of the tower crane 1, a fixed pulley 28 fixed at a predetermined hoisting point, a steel wire rope 20 connected between the hoisting machine 19 and the fixed pulley 28, and a movable pulley 26 disposed on the steel wire rope 20, wherein one end of the steel wire rope 20 is connected to the fixed pulley 28, and the other end thereof passes through the movable pulley 26 and the fixed pulley 28 in sequence and is connected to the hoisting machine 19. A hoist 19 is also arranged at the tower top for pulling the movable pulley 26 to the tower top.
2.3 lifting one end anchorage of the stay cable 2 and connecting it with the anchoring end of the tower crane 1
2.3.1, placing a cable tray 17 at the tower bottom of the tower crane 1, and fixing an anchorage at one end of the stay cable 2 on a movable pulley 26.
And 2.3.2, lifting the anchorage device at one end of the stay cable 2 to the anchorage end ear plate of the tower crane 1, and connecting the anchorage device at one end of the stay cable 2 with the anchorage end ear plate of the tower crane 1.
2.3.3, the cable tray 17 is hung in the air by the crawler crane 27, and the anchor at the other end of the stay cable 2 is pulled by the truck-mounted crane 11 to be unfolded in the field until the stay cable 2 is completely laid.
3. Anchor for lifting the other end of stay cable 2
And connecting an anchorage at the other end of the stay cable 2 with a ring cable node 6 by using an auxiliary assembling and lifting device of the truck crane, and adopting symmetrical lifting and graded tensioning.
3.1 arrangement of auxiliary assembly lifting device for truck crane
As shown in fig. 10, calculating the blanking length of the steel strand 7 through finite element software, assembling the inserting lugs, lifting the steel strand 7, installing the inserting lugs to the ring cable nodes 6 with corresponding numbers, and assembling the stay cable tensioning tool 10 and the jack.
3.2 symmetrical lifting and staged tensioning
As shown in fig. 11-13, the symmetrical lifting and staged tensioning method includes the steps of:
3.2.1, symmetrically hoisting the two ring cable nodes 6 by adopting 2 trolley cranes 11 to separate from the frame body, symmetrically hoisting the two stay cable tensioning tools 10 by adopting 2 crawler cranes 27, pre-tensioning the steel strand 7 at the same time until the height of the stay cable tensioning tools 10 is the same as that of the ring cable nodes 6, and then loosening the hooks of the crawler cranes 27.
3.2.2, continuously lifting the stay cable 2 until the steel strand 7 reaches the calculated theoretical length, and then releasing the hook of the truck-mounted crane 11.
3.2.3, repeating S31 and S32, and sequentially starting from the center symmetry of the site until the two stay cables 2 close to the tower crane 1 are finished, wherein the structures on the east side and the west side are sequentially carried out.
3.2.4, after all the stay cables 2 are lifted, the stay cables 2 are tensioned in a grading way, and the tensioning length of each steel strand 7 is calculated through finite element software according to the equal proportion synchronous tensioning principle.
3.2.5, because the angle of the stay cable ear plate 44 and the stay cable auxiliary ear plate 45 is changed constantly in the tensioning process, the installation of the stay cable 2 is completed by rotating the cable clamp 4 and installing the pin shaft by rotating the cable clamp 4.
Specifically, taking a certain project as an example, the aperture of the stay cable auxiliary lug plate 45 is 80mm, the radius of the lug plate is 130mm, and the lug insertion installation construction space is guaranteed. The auxiliary ear plate 45 of the stay cable is made of steel casting, and the steel material is G20Mn 5. The hoist 19 on the ring beam is a 5 ton hoist. Specifically, taking a project as an example, the movable pulley 26 is a 10-ton movable pulley block, the winch 19 at the bottom of the tower is a 10-ton winch, and the winch 19 at the top of the tower is a 3-ton winch. The number of the stay cables 2 is 36.
The above examples are only for describing the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.
Claims (10)
1. A construction method of a stay cable with a flexible cable net boundary is characterized by comprising the following steps:
s1, preparation work before the stay cable (2) is hung: deeply designing a cable clamp (4) of a ring cable node (6), determining a space position when the ring cable node (6) is laid, erecting a radial cable support jig frame (12) and a ring cable support jig frame (13), then laying a radial cable (16) and a ring cable (22) based on the radial cable support jig frame (12) and the ring cable support jig frame (13), and connecting the radial cable (16) and the ring cable (22) by using the cable clamp (4);
s2, mounting an anchorage at one end of the stay cable (2) at high altitude: erecting a steel frame platform (23) on the top of the tower crane (1), arranging a movable pulley block hoisting device, and lifting an anchorage device at one end of a stay cable (2) and connecting the anchorage device with an anchoring end of the tower crane (1);
s3, lifting the anchorage at the other end of the stay cable (2): and (3) connecting an anchorage at the other end of the stay cable (2) with a ring cable node (6) by using an auxiliary assembly lifting device of a truck crane, and adopting symmetrical lifting and graded tensioning.
2. A construction method of a stay cable with a flexible cable net boundary according to claim 1, characterized in that: the cable clamp (4) comprises a cable clamp body (41), a ring cable head (42), radial cable lugs (43), stay cable lugs (44) and stay cable auxiliary lugs (45), wherein the stay cable auxiliary lugs (45) are connected to two sides of the stay cable lugs (44), and the hole centers of the two stay cable auxiliary lugs (45) and the hole centers of the stay cable lugs (44) are located on the same straight line.
3. The construction method of the stay cable with the flexible cable net boundary as recited in claim 1, wherein the determination method of the spatial position of the loop cable node (6) when laid in S1 is: and drawing a circle by taking the hole center of the ring beam ear plate (9) as the center of a circle and the length of the radial cable (16) as the radius, connecting the hole center of the ring beam ear plate (9) with the high stand edge (8), and taking the intersection point of the extension line and the circle as the spatial position when the ring cable node (6) is laid.
4. A construction method of a stay cable with a flexible cable net boundary according to claim 1, characterized in that: the utility model discloses a high stand of a bleacher, including stand, hoop cable support bed-jig (13) and radial cable support bed-jig (12), the connection node of hoop cable support bed-jig (13) and radial cable support bed-jig (12) is hoop cable node support bed-jig (14), the top elevation of hoop cable support bed-jig (13) is space position Z coordinate when the hoop cable node is put, and radial cable support bed-jig (12) height equals the distance between the hole center of ring beam otic placode (9) and high stand limit (8).
5. The construction method of the stay cable with flexible cable net boundary as claimed in claim 1, wherein the laying method of the radial cable (16) and the ring cable (22) in S1 is:
s11, laying a steel plate platform (18) on a ring cable node supporting jig frame (14) at the connecting node of a ring cable supporting jig frame (13) and a radial cable supporting jig frame (12), and hanging a cable releasing disc (17) on the steel plate platform (18);
s12, installing a winch (19) on the ring beam (5), connecting a steel wire rope (20) on the winch (19) with a radial cable paying-off trolley (15), connecting a cable head of a radial cable (16) with the radial cable paying-off trolley (15), and drawing the radial cable (16) to be unfolded on a radial cable supporting jig (12) by the winch (19);
s13, installing the radial cable (16) in place by matching the crawler crane (27) with the winch (19);
s14, hoisting and placing the cable tray (17), and hoisting the ring cable joint (6) to the steel plate platform (18);
s15, connecting the radial cable (16) with the annular cable node (6), and connecting the annular cable (22) with the annular cable node (6).
6. A construction method of a stay cable with a flexible cable net boundary according to claim 1, characterized in that: and (3) before the steel frame platform (23) in the S2 is erected, calculating the stress and deformation distribution of the steel frame platform (23) through finite element software.
7. A construction method of a stay cable with a flexible cable net boundary according to claim 1, characterized in that: the movable pulley block hoisting device in the S2 comprises a winch (19) arranged at the bottom of the tower crane (1), a fixed pulley (28) fixed at a preset hoisting point, a steel wire rope (20) connected between the winch (19) and the fixed pulley (28), and a movable pulley (26) arranged on the steel wire rope (20), wherein one end of the steel wire rope (20) is connected with the fixed pulley (28), and the other end of the steel wire rope sequentially penetrates through the movable pulley (26) and the fixed pulley (28) and is connected with the winch (19).
8. The construction method of a stay cable with a flexible cable net boundary as claimed in claim 7, wherein the lifting method of the anchorage of one end of the stay cable (2) in S2 comprises the steps of:
s21, placing a cable tray (17) at the tower bottom of the tower crane (1), and fixing an anchorage at one end of a stay cable (2) on a movable pulley (26);
s22, lifting an anchorage device at one end of the stay cable (2) to an anchoring end ear plate of the tower crane (1), and connecting the anchorage device at one end of the stay cable (2) with the anchoring end ear plate of the tower crane (1);
s23, the cable tray (17) is lifted by the crawler crane (27) to be suspended, and the anchor at the other end of the stay cable (2) is pulled by the truck-mounted crane (11) to be unfolded in the field until the stay cable (2) is laid.
9. A construction method of a diagonal cable with a flexible cable net boundary as recited in claim 1, wherein the method of arranging the truck crane auxiliary assembly hoisting device in S3 is: calculating the blanking length of the steel strand (7) through finite element software, assembling the inserting lugs, lifting the steel strand (7), installing the inserting lugs to the ring cable nodes (6) with corresponding numbers, and assembling the stay cable tensioning tool (10) and the jack.
10. A construction method of a diagonal cable with a flexible cable net boundary as recited in claim 9, wherein the symmetrical lifting and step tensioning method in S3 comprises the steps of:
s31, symmetrically hoisting two ring cable nodes (6) by using 2 truck-mounted cranes (11) to separate from a frame body, symmetrically hoisting two stay cable tensioning tools (10) by using 2 crawler cranes (27), pre-tensioning steel strands (7) at the same time until the stay cable tensioning tools (10) are the same as the ring cable nodes (6), and then loosening the hooks of the crawler cranes (27);
s32, continuing to lift the stay cable (2) until the steel strand (7) reaches the calculated theoretical length, and then releasing the hook of the truck-mounted crane (11);
s33, repeating S31 and S32, starting from the site center symmetry in sequence until two stay cables (2) close to the tower crane (1) are finished, and sequentially carrying out the structure on the east side and the west side;
s34, after all the stay cables (2) are lifted, the stay cables (2) are tensioned in a grading manner, and the tensioning length of each grade of steel strand (7) is calculated through finite element software according to an equal proportion synchronous tensioning principle;
and S35, adjusting the cable clamp (4), installing the pin shaft, and finally completing the installation of the stay cable (2).
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