Large span double-frame prestressed CFRP cable-truss structure

Abstract

The large-span double-frame prestressed CFRP suspension cable truss structure is a new type of CFRP suspension cable truss roof bearing structure system. The roof bearing structure system includes a main truss, a vertical support system and connecting rods. The main truss consists of two CFRP suspension cable trusses and a balance bar, and the vertical support system consists of a support column and a pipe truss. The CFRP suspension cable truss includes an upper CFRP suspension cable, a lower CFRP suspension cable, a vertical CFRP suspension cable and a suspension cable clamp; the CFRP suspension cable truss obtains bearing capacity by tensioning the upper CFRP suspension cable, and the two CFRP suspension cable trusses in each main truss are connected by a balance bar to form a force-bearing whole of the main truss, which can realize the large-span layout of the roof; the double-layer CFRP suspension cable can withstand horizontal, vertical loads and wind suction, and the main load-bearing component CFRP suspension cable has the advantages of light weight, high strength and corrosion resistance, which can realize the large span capacity and stable operation of the roof structure.

Description

Technical Field

[0001] The invention relates to a large-span space roof load-bearing structure system, in particular to a large-span double-frame prestressed CFRP suspension cable truss structure. Background Art

[0002] CFRP (carbon fiber reinforced composite material) is a new generation of high-performance materials for engineering applications. Compared with steel, CFRP has a higher specific strength (ratio of strength to weight), which enables the structure to obtain a larger span capacity. Its corrosion resistance makes it more durable than steel components. At the same time, its creep, relaxation and temperature effects are lower than those of steel. Therefore, its excellent properties such as light weight, high strength and corrosion resistance are very suitable for use in large-span space structures. At present, the most mature CFRP cable type studied and applied worldwide is the strip cable, which has been used in bridge and house reinforcement.

[0003] In the large-span space structure, airport terminals, exhibition centers, stadiums and other large public buildings are increasing day by day, but there are few spatial structures that can match high-performance CFRP, and high-performance structural systems that meet large span capabilities are urgently needed to be developed. At the same time, the existing structural system and connection structure are mainly suitable for circular cross-section cables, not for flat strip CFRP cables. Therefore, it is necessary to develop a new high-performance large-span space structure system based on the characteristics of CFRP strip cables. Summary of the invention

[0004] The technical problem to be solved by the present invention is to propose a new type of large-span double-frame prestressed CFRP suspension cable truss structure, and propose an inward-concave CFRP suspension cable truss and a connecting cable clamp for the CFRP strip cable. All cable components are composed of CFRP suspension cables. The CFRP suspension cables obtain bearing capacity by applying prestress. The double-layer suspension belt can withstand horizontal, vertical and wind suction forces. The double-frame CFRP suspension cable truss works together to achieve a larger spanning capacity.

[0005] To achieve the above-mentioned purpose, the technical solution provided by the embodiment of the present invention is: the structure includes a main truss, a vertical support system and connecting rods, the main truss is composed of two CFRP suspension cable trusses and a balance rod, the vertical support system is composed of support columns and tube trusses, the CFRP suspension cable trusses include upper CFRP suspension cables, lower CFRP suspension cables, vertical CFRP suspension cables and suspension cable clamps, the balance rods include main balance rods and secondary balance rods, the tube truss includes top horizontal rods, bottom horizontal rods, vertical braces and cross braces, and the suspension cable clamps include main suspension cable clamps and secondary suspension cable clamps.

[0006] The CFRP suspension cable truss is concave, and the distance between the upper CFRP suspension cable and the lower CFRP suspension cable gradually decreases from its end to the middle, that is, the distance between the two ends of the vertical CFRP suspension cable gradually decreases from the end to the middle of the CFRP suspension cable truss, reaching a minimum value in the middle. The upper CFRP suspension cable is supported by the top horizontal bar in the tube truss and is inclined to the ground for anchoring. The upper CFRP suspension cable is tightly attached to the support position of the top horizontal bar in the tube truss with an arc-shaped clamp, and the upper CFRP suspension cable is fixed to the tube truss by bolting the arc-shaped clamp. There are several nodes in the upper CFRP suspension cable, and each node position is connected to the upper end of the vertical CFRP suspension cable through the suspension main cable clamp; the lower CFRP suspension cable adopts a stacked CFRP self-anchored ring cable, and has round holes at both ends that can be fixed to the bottom horizontal bar in the tube truss through pins. In the ear plate of the rod, the lower CFRP sling cable has several main nodes that are consistent with the upper CFRP sling cable in the vertical direction. Each main node position is connected to the lower end of the vertical CFRP sling cable through the sling main cable clamp, and a sling secondary cable clamp is set at the secondary node position between adjacent main nodes; the vertical CFRP sling cable adopts a non-stacked CFRP self-anchored ring cable, the upper end of which is fixed to the node position of the upper CFRP sling cable by winding the sling main cable clamp, and the lower end is fixed to the main node position of the lower CFRP sling cable by winding the sling main cable clamp.

[0007] The main cable clamp of the sling includes a main plate, a secondary plate and an end cap, wherein the main plate is three sections of semi-cylinders of unequal cross-sections, and a semi-circular groove is opened in the vertical cross-section along the length direction of the cylinder to facilitate the vertical CFRP sling cable to be embedded in the semi-circular groove for winding and anchoring, and the cross-sectional radius of the semi-cylinders at both ends is the same as the winding radius of the vertical CFRP sling cable; the secondary plate is three sections of semi-cylinders of unequal cross-sections, and the cross-sectional radius of the semi-cylinders at both ends is the same as the winding radius of the vertical CFRP sling cable in the main plate, and the length of the semi-cylinders at both ends is the length of the semi-cylinders at both ends in the main plate minus the length of the semi-cylinders at both ends The cross-sectional radius of the middle semi-cylinder is the same as the cross-sectional radius of the main plate, the long side planes of the main plate and the auxiliary plate fit each other, and the upper CFRP suspension cable or the lower CFRP suspension cable is clamped in the middle position of their fitting surfaces; a hollow end cap is inserted into one end of the main plate and the auxiliary plate as a whole, and the suspension main cable clamp is fixed as a whole by welding or bolt connection, one side of the end cap is hollow and the other side is solid, and its inner radius is the same as the cross-sectional radius of the end of the main plate or the auxiliary plate, and the outer diameter is the same as the cross-sectional radius of the middle section of the main plate; in the main plate and the auxiliary plate, a hollow end cap is inserted into one end of the main plate and the auxiliary plate as a whole, and the end cap is hollow on one side and solid on the other side, and its inner radius is the same as the cross-sectional radius of the end of the main plate or the auxiliary plate, and the outer diameter is the same as the cross-sectional radius of the middle section of the main plate; in the main plate and the auxiliary plate, a hollow end cap is inserted into one end of the main plate and the auxiliary plate as a whole, and the hollow end cap is inserted into one end of the main plate and the auxiliary plate as a whole, and the inner radius of the end cap ... The splint is connected to the main balance pole on one side, and the main balance pole is sleeved on the ends of the main splint and the auxiliary splint to form a whole through welding or bolting. The end cap is connected to the middle tie rod on one side, and the end cap is connected to the middle tie rod through welding or bolting to form a whole; the secondary cable clamp of the sling includes a splint and a side cap, and the splint is three sections of semi-cylinders with unequal cross-sections, the cross-sectional radius of the semi-cylinders at the two ends does not exceed the inner diameter of the end cap, and the cross-sectional radius of the middle semi-cylinder is larger than the radius of the semi-cylinders at the two ends; the long side planes of the two splints are fitted together to form a whole, and in the middle of their fitting surfaces The lower CFRP suspension cable is clamped in position; hollow side caps are inserted into the two ends of the two clamping plates that form a whole, and the suspension secondary cable clamp is fixed as a whole by welding or bolting, one side of the side cap is hollow and the other side is solid, and its inner radius is the same as the end section radius of the clamping plate, and the outer radius is the same as the middle section of the clamping plate; on the side where the two clamping plates are connected to the secondary balance bar, the secondary balance bar is sleeved on the end of the two clamping plates and connected to form a whole by welding or bolting, and on the side where the side cap is connected to the middle tie rod, the side cap is connected to the middle tie rod by welding or bolting to form a whole.

[0008] The main balance pole is a hollow circular tube, and its two ends are respectively connected to the two cable trusses on the main cable clamps of the suspension at the same position of the two cable trusses in the main truss. The secondary balance pole is a hollow circular tube, and its two ends are respectively connected to the two cable trusses on the secondary cable clamps of the suspension at the same position of the two lower CFRP suspension cables in the main truss. When the number of main balance poles meets the structural bearing requirements, the secondary balance poles and the secondary cable clamps of the suspension may not be arranged.

[0009] The vertical support system is arranged at both ends of the CFRP suspension cable truss to provide support, and can effectively transmit the horizontal force and vertical force transmitted from the CFRP suspension cable truss to the foundation; the tube truss is fixed on the upper part of the support column, and the two vertical struts in the tube truss are respectively in the same vertical plane with the two CFRP suspension cable trusses, that is, the spacing between the two CFRP suspension cable trusses is the same as the spacing between the two vertical struts in the tube truss; in the tube truss, the length of the top horizontal rod is within 200mm greater than the spacing between the vertical struts, that is, both sides of the top horizontal rod extend within 100mm from the intersection with the vertical struts; each rod in the tube truss is in the same vertical plane.

[0010] The upper CFRP suspension cable is tensioned to make the CFRP suspension cable truss obtain prestress, ensuring that the main truss has reliable bearing capacity; longitudinal connecting rods are arranged between the main trusses to connect the transverse main trusses into a whole, so as to realize reliable and efficient bearing of the overall large-span roof structure; the connecting rods include edge ties and intermediate ties, the edge ties are firmly connected to the bottom horizontal rods in the tube truss, and the intermediate ties are firmly connected to the nodes of the lower CFRP suspension cable.

[0011] Beneficial effects of the present invention: 1. The main load-bearing components of the cable truss are all CFRP suspension cables, which have the advantages of light weight, high strength, and corrosion resistance, so that the structure can achieve a larger spanning capacity and long-term stable operation.

[0012] 2. According to the characteristics of CFRP strip cables, an inward-concave CFRP suspension cable truss and a connecting cable clamp structure in which the main load-bearing components are composed of CFRP strip cables are proposed.

[0013] 3. By applying prestress, the CFRP suspension cable gains bearing capacity, and the double-layer suspension cable can withstand horizontal, vertical loads and wind suction.

[0014] 4. The two CFRP suspension cable trusses in each main truss are connected by a balance rod to form a force-bearing whole of the main truss, which can realize the large-span layout of the roof.

[0015] 5. The structural system of the present invention has reasonable layout, novel form, beautiful shape, easy production and installation, and strong engineering practicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional spatial schematic diagram of the structure of the present invention;

[0017] Figure 2 for Figure 1 A side view of the structure of the present invention;

[0018] Figure 3 for Figure 1Schematic diagram of the position fixation of the upper CFRP suspension cable on the top horizontal rod in the structure of the present invention (A area);

[0019] Figure 4 for Figure 1 Schematic diagram of the anchoring of the lower CFRP suspension cable end on the ear plate of the bottom horizontal rod in the structure of the present invention (area B);

[0020] Figure 5 for Figure 1 A schematic diagram of the connection nodes of the upper and lower ends of the vertical CFRP suspension cable on one side connected to the connecting rod in the structure of the present invention (area C);

[0021] Figure 6 for Figure 1 Schematic diagram of the connection nodes at the upper and lower ends of the vertical CFRP suspension cables of the side trusses in the structure of the present invention (area D);

[0022] Figure 7 for Figure 1 Schematic diagram of the secondary connection node of the lower CFRP suspension cable on the side connected to the connecting rod in the structure of the present invention (area E);

[0023] Figure 8 for Figure 1 Schematic diagram of the secondary connection node of the CFRP suspension cable under the side truss in the structure of the present invention (F area);

[0024] Fig. 9 for Figure 1 Schematic diagram of the connection and fixation between the CFRP suspension cables in the structure of the present invention (C, D, E, F areas);

[0025] Fig.10 It is a simplified diagram of a calculation case of the structure arrangement of the present invention;

[0026] Among them, 1-upper CFRP suspension cable, 2-lower CFRP suspension cable, 3-vertical CFRP suspension cable, 4-support column, 501-top horizontal rod, 502-bottom horizontal rod, 503-vertical strut, 504-cross strut, 6-edge tie rod, 7-main balance rod, 701-main splint, 702-secondary splint, 703-end cap, 8-secondary balance rod, 801-splint, 802-side cap, 9-middle tie rod, 10-ear plate, 1001-pin, 11-arc splint, 1101-bolt. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] A new type of long-span double-frame prestressed CFRP cable-truss structure, including a main truss, a vertical support system and connecting rods ( Figure 1 ), the main truss is composed of two CFRP suspension cable trusses and a balance rod, the vertical support system is composed of a support column 4 and a tube truss, the CFRP suspension cable truss includes an upper CFRP suspension cable 1, a lower CFRP suspension cable 2, a vertical CFRP suspension cable 3 and a suspension cable clamp, the balance rod includes a main balance rod 7 and a secondary balance rod 8, the tube truss includes a top horizontal rod 501, a bottom horizontal rod 502, a vertical brace rod 503 and a cross brace rod 504, and the suspension cable clamp includes a main suspension cable clamp and a secondary suspension cable clamp.

[0029] The CFRP suspension cable truss is a concave type ( Figure 2 ), the distance between the upper CFRP suspension cable 1 and the lower CFRP suspension cable 2 gradually decreases from the end to the middle, that is, the distance between the two ends of the vertical CFRP suspension cable 3 gradually decreases from the end to the middle of the CFRP suspension cable truss, reaching the minimum value in the middle. The upper CFRP suspension cable 1 is supported by the top horizontal rod 501 in the tube truss and is inclined to the ground for anchoring. The upper CFRP suspension cable 1 is tightly attached to the support position of the top horizontal rod 501 in the tube truss with an arc clamp 11 ( Figure 3 ), and fix the upper CFRP suspension cable 1 to the tube truss by fastening the arc-shaped clamping plate 11 with bolts 1101. The upper CFRP suspension cable 1 has several nodes, and each node position is connected to the upper end of the vertical CFRP suspension cable 3 through the suspension main cable clamp ( Figure 5 The lower CFRP suspension cable 2 adopts a laminated CFRP self-anchored ring cable, with round holes at both ends, which can be fixed to the ear plate 10 of the bottom horizontal rod 502 of the tube truss through pins 1001 ( Figure 4 ), the lower CFRP suspension cable 2 has several main nodes that are consistent with the upper CFRP suspension cable 1 in the vertical direction, and each main node position is connected to the lower end of the vertical CFRP suspension cable 3 through the suspension main cable clamp ( Figure 5 , 6 ), and set the secondary cable clamp of the suspension belt at the secondary node position between the adjacent main nodes ( Figure 7 , 8The vertical CFRP suspension cable 3 adopts a non-stacked CFRP self-anchored ring cable, the upper end of which is fixed to the node position of the upper CFRP suspension cable 1 by winding the suspension main cable clamp, and the lower end is fixed to the main node position of the lower CFRP suspension cable 2 by winding the suspension main cable clamp ( Figure 5 , 6 ).

[0030] The sling main cable clamp comprises a main clamping plate 701, a secondary clamping plate 702 and an end cap 703 ( Figure 5 ), the main splint 701 is composed of three sections of semi-cylinders with unequal cross-sections, and a semi-circular groove is opened in the vertical cross-section along the length direction of the cylinder to facilitate the vertical CFRP suspension cable 3 to be embedded in the semi-circular groove for winding and anchoring. The cross-sectional radius of the semi-cylinders at both ends is the same as the winding radius of the vertical CFRP suspension cable 3; the auxiliary splint 702 is composed of three sections of semi-cylinders with unequal cross-sections, and the cross-sectional radius of the semi-cylinders at both ends is the same as the winding radius of the vertical CFRP suspension cable 3 in the main splint 701 ( Figure 5 ), and the length of the semi-cylinders at both ends is the length of the semi-cylinders at both ends of the main splint 701 minus the width of the vertical CFRP suspension cable 3, the cross-sectional radius of the middle semi-cylinder is the same as the cross-sectional radius of the main splint 701, the long side planes of the main splint 701 and the auxiliary splint 702 fit each other, and the upper CFRP suspension cable 1 or the lower CFRP suspension cable 2 is clamped at the middle position of their fitting surfaces; a hollow end cap 703 is inserted into one end of the main splint 701 and the auxiliary splint 702 as a whole, and the suspension main cable clamp is fixed as a whole by welding or bolting, the end cap 703 is hollow on one side and solid on the other side, and its inner radius is the same as the cross-sectional radius of the end of the main splint 701 or the auxiliary splint 702, and the outer diameter is the same as the cross-sectional radius of the middle part of the main splint 701; the main splint 701 and the auxiliary splint 702 are connected to the main balance bar 7 on one side ( Figure 5 ), the main balance bar 7 is sleeved on the ends of the main plate 701 and the auxiliary plate 702 and connected by welding or bolts to form a whole, and the end cap 703 is connected to the middle tie rod 9 on one side ( Figure 5 ), the end cap 703 is connected to the middle tie rod 9 by welding or bolting to form a whole; the secondary cable clamp of the sling includes a clamping plate 801 and a side cap 802 ( Figure 7), the clamping plate 801 is composed of three sections of semi-cylinders with unequal cross-sections, the cross-sectional radius of the semi-cylinders at the two ends does not exceed the inner diameter of the end cap 703, and the cross-sectional radius of the middle semi-cylinder is larger than the radius of the semi-cylinders at the two ends; the long side planes of the two clamping plates 801 are fitted together to form a whole, and the lower CFRP suspension cable 2 is clamped at the middle position of their fitting surfaces; hollow side caps 802 are inserted into the two ends of the two clamping plates 801 that form the whole, and the suspension secondary cable clamp is fixed as a whole by welding or bolting, and one side of the side cap 802 is hollow and the other side is solid, and its inner radius is the same as the cross-sectional radius of the end of the clamping plate 801, and the outer radius is the same as the cross-sectional radius of the middle part of the clamping plate 801; the two clamping plates 801 are connected to the secondary balance bar 8 on one side ( Figure 7 ), the secondary balance bar 8 is put on the ends of the two clamping plates 801 and connected by welding or bolts to form a whole, and the side cap 802 is connected to the middle tie rod 9 on one side ( Figure 7 ), the side cap 802 is connected to the middle tie rod 9 by welding or bolting to form a whole.

[0031] The main balance pole 7 is a hollow circular tube, and its two ends are connected to the two cable trusses on the main cable clamps of the suspension belt at the same position of the two cable trusses in the main truss ( Fig. 9 ), the secondary balance bar 8 is a hollow circular tube, and its two ends are connected to the two cable trusses on the secondary cable clamps of the two lower CFRP suspension cables 2 in the main truss at the same position ( Fig. 9 ); When the number of the main balance poles 7 meets the structural load-bearing requirements, the secondary balance poles 8 and the secondary cable clamps of the suspension belts may not be arranged.

[0032] The vertical support system is set at the end of the CFRP suspension cable truss to provide support, and can effectively transmit the horizontal force and vertical force from the CFRP suspension cable truss to the foundation ( Figure 1 The support column 4 is provided with a fixed tube truss on the upper part, and the two vertical struts 503 in the tube truss are respectively in the same vertical plane with the two CFRP suspension cable trusses ( Figure 1 ), that is, the spacing between the two CFRP suspension cable trusses is the same as the spacing between the two vertical struts 503 in the tube truss; in the tube truss, the length of the top horizontal rod 501 is within 200mm greater than the spacing between the vertical struts 503, that is, both sides of the top horizontal rod 501 extend within 100mm from the intersection with the vertical struts 503; each rod in the tube truss is in the same vertical plane.

[0033] The upper CFRP suspension cable 1 is tensioned to make the CFRP suspension cable truss obtain prestress, ensuring that the main truss has a reliable bearing capacity; longitudinal connecting rods are arranged between the main trusses to connect the transverse main trusses into a whole, so as to realize the reliable and efficient bearing of the overall large-span roof structure ( Figure 1 , 10The connecting rods include edge tie rods 6 and intermediate tie rods 9, wherein the edge tie rods 6 are firmly connected to the bottom horizontal rods 502 in the tube truss, and the intermediate tie rods 9 are firmly connected to each node of the lower CFRP suspension cable 2.

[0034] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, which should also be regarded as the protection scope of the present invention.

Claims

1. A large-span double-frame prestressed CFRP cable-truss structure, characterized by: It includes a main truss, a vertical support system and a connecting rod. The main truss is composed of two CFRP suspension cable trusses and a balance rod. The vertical support system is composed of a support column and a tube truss. The CFRP suspension cable truss includes an upper CFRP suspension cable, a lower CFRP suspension cable, a vertical CFRP suspension cable and a suspension cable clamp. The tube truss includes a top horizontal bar, a bottom horizontal bar, a vertical brace and a cross brace. The suspension cable clamp includes a main suspension cable clamp and a secondary suspension cable clamp. The CFRP suspension cable truss is concave, and the distance between the upper CFRP suspension cable and the lower CFRP suspension cable gradually decreases from the end to the middle, that is, the distance between the two ends of the vertical CFRP suspension cable gradually decreases from the end to the middle of the CFRP suspension cable truss, and reaches a minimum value in the middle; the upper CFRP suspension cable is supported by the top horizontal rod in the tube truss and pulled obliquely to the ground for anchoring, and the upper CFRP suspension cable is tightly attached to the support position of the top horizontal rod in the tube truss with an arc clamp, and the upper CFRP suspension cable is fixed to the tube truss by bolting the arc clamp, and there are several nodes in the upper CFRP suspension cable, and each node position is connected to the upper end of the vertical CFRP suspension cable through the suspension main cable clamp; The lower CFRP suspension cable adopts a laminated CFRP self-anchored ring cable, with round holes at both ends fixed to the ear plate of the bottom horizontal rod in the tube truss through pins. The lower CFRP suspension cable has several main nodes that are consistent with the upper CFRP suspension cable in the vertical direction. Each main node position is connected to the lower end of the vertical CFRP suspension cable through the suspension main cable clamp, and a suspension secondary cable clamp is set at the secondary node position between adjacent main nodes; the vertical CFRP suspension cable adopts a non-laminated CFRP self-anchored ring cable, the upper end of which is fixed to the node position of the upper CFRP suspension cable by winding the suspension main cable clamp, and the lower end is fixed to the main node position of the lower CFRP suspension cable by winding the suspension main cable clamp; The balance pole at least includes a main balance pole; when the number of the main balance poles meets the structural load-bearing requirements, the secondary balance pole and the secondary cable clamp of the suspension belt may not be arranged; The main cable clamp of the sling includes a main plate, a secondary plate and an end cap, wherein the main plate is three sections of semi-cylinders of unequal cross-sections, and a semi-circular groove is opened in the vertical cross-section along the length direction of the cylinder to facilitate the vertical CFRP sling cable to be embedded in the semi-circular groove for winding and anchoring, and the cross-sectional radius of the semi-cylinders at both ends is the same as the winding radius of the vertical CFRP sling cable; the secondary plate is three sections of semi-cylinders of unequal cross-sections, and the cross-sectional radius of the semi-cylinders at both ends is the same as the winding radius of the vertical CFRP sling cable in the main plate, and the length of the semi-cylinders at both ends is the length of the semi-cylinders at both ends in the main plate minus the length of the semi-cylinders at both ends The cross-sectional radius of the middle semi-cylinder is the same as the cross-sectional radius of the main plate, the long side planes of the main plate and the auxiliary plate fit each other, and the upper CFRP suspension cable or the lower CFRP suspension cable is clamped in the middle position of their fitting surfaces; a hollow end cap is inserted into one end of the main plate and the auxiliary plate as a whole, and the suspension main cable clamp is fixed as a whole by welding or bolt connection, one side of the end cap is hollow and the other side is solid, and its inner radius is the same as the cross-sectional radius of the end of the main plate or the auxiliary plate, and the outer diameter is the same as the cross-sectional radius of the middle section of the main plate; in the main plate and the auxiliary plate, a hollow end cap is inserted into one end of the main plate and the auxiliary plate as a whole, and the end cap is hollow on one side and solid on the other side, and its inner radius is the same as the cross-sectional radius of the end of the main plate or the auxiliary plate, and the outer diameter is the same as the cross-sectional radius of the middle section of the main plate; in the main plate and the auxiliary plate, a hollow end cap is inserted into one end of the main plate and the auxiliary plate as a whole, and the hollow end cap is inserted into one end of the main plate and the auxiliary plate as a whole, and the inner radius of the end cap ... The splint is connected to the main balance pole on one side, and the main balance pole is sleeved on the ends of the main splint and the auxiliary splint to form a whole through welding or bolting. The end cap is connected to the middle tie rod on one side, and the end cap is connected to the middle tie rod through welding or bolting to form a whole; the secondary cable clamp of the sling includes a splint and a side cap, and the splint is three sections of semi-cylinders with unequal cross-sections, the cross-sectional radius of the semi-cylinders at the two ends does not exceed the inner diameter of the end cap, and the cross-sectional radius of the middle semi-cylinder is larger than the radius of the semi-cylinders at the two ends; the long side planes of the two splints are fitted together to form a whole, and in the middle of their fitting surfaces The lower CFRP suspension cable is clamped in position; hollow side caps are inserted into the two ends of the two clamping plates that form an integral body, and the secondary suspension cable clamp is fixed into an integral body by welding or bolting, wherein one side of the side cap is hollow and the other side is solid, and its inner radius is the same as the end section radius of the clamping plate, and the outer radius is the same as the middle section of the clamping plate; on the side where the two clamping plates are connected to the secondary balance bar, the secondary balance bar is sleeved on the ends of the two clamping plates and connected by welding or bolting to form an integral body; on the side where the side cap is connected to the middle tie rod, the side cap is connected to the middle tie rod by welding or bolting to form an integral body; The main balance rod is a hollow circular tube, and its two ends are respectively connected to the two cable trusses on the main cable clamps of the suspension at the same position of the two cable trusses in the main truss. The secondary balance rod is a hollow circular tube, and its two ends are respectively connected to the two cable trusses on the secondary cable clamps of the suspension at the same position of the two lower CFRP suspension cables in the main truss.

2. The large-span double-frame prestressed CFRP cable-truss structure according to claim 1 is characterized in that: The tube truss is fixed on the upper part of the support column, and the two vertical struts in the tube truss are respectively in the same vertical plane with the two CFRP suspension cable trusses, that is, the spacing between the two CFRP suspension cable trusses is the same as the spacing between the two vertical struts in the tube truss; the length of the top horizontal rod in the tube truss is within 200mm greater than the spacing between the vertical struts, that is, both sides of the top horizontal rod extend within 100mm from the intersection with the vertical struts; each rod in the tube truss is in the same vertical plane.

3. The large-span double-frame prestressed CFRP cable-truss structure according to claim 1 is characterized in that: The upper CFRP suspension cable is tensioned to make the CFRP suspension cable truss obtain prestress, ensuring that the main truss has a reliable bearing capacity; the connecting rod includes an edge tie rod and an intermediate tie rod, the edge tie rod is firmly connected to the bottom horizontal rod in the tube truss, and the intermediate tie rod is firmly connected to each node of the lower CFRP suspension cable.

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