Cable structure supporting rod lower node connecting device suitable for CFRP cable

Abstract

The invention discloses a cable structure supporting rod lower node connecting device suitable for a CFRP cable, and belongs to the technical field of building structures, and the cable structure supporting rod lower node connecting device comprises an annular continuous cable connecting part, an inclined discontinuous cable connecting part and a vertical supporting rod connecting part. The circumferential continuous cable connecting part comprises a fixed end main body, a CFRP circumferential cable, a cableway cover plate, a first centripetal joint bearing and a polytetrafluoroethylene sleeve; the oblique cable connecting part comprises an oblique lug plate, a CFRP oblique cable, an oblique cable anchorage device, a fork lug, a second centripetal joint bearing, a stop groove and a pin shaft; the vertical supporting rod connecting part comprises a vertical lug plate and a round hole. Components in different directions are effectively connected, installation and maintenance are convenient, and prestress loss is reduced. By improving the bending of the CFRP cable at the node, the tensile strength and shear resistance of the CFRP cable are improved.

Description

Technical Field

[0001] The invention relates to the technical field of building structures, and in particular to a lower node connection device of a cable structure strut suitable for a CFRP cable. Background Art

[0002] The cable structure is a prestressed structural system formed by cables as the main load-bearing components. This structure gives full play to the tensile properties of high-strength cables, improves the internal force distribution and deformation characteristics of the structure by applying prestress, and makes the structure more economical and efficient. Therefore, it has been widely used in the field of space structures.

[0003] Cables are important components of cable structures. However, as the requirements for span and maintenance in the field of spatial structures become increasingly higher, traditional steel cables are difficult to adapt to the development direction of this field due to their disadvantages such as high density and easy corrosion.

[0004] CFRP (Carbon Fiber Reinforced Polymer) cables have the advantages of light weight, high strength, good corrosion resistance, and strong fatigue resistance. Using CFRP cables instead of traditional steel cables can increase the structural span, increase structural durability, meet the requirements of lightweight structure, and give full play to the characteristics of cable structures, making the development prospects of this structure broader.

[0005] The positional relationship between the nodes of the cable structure is difficult to change in coordination with the load-bearing state during the prestressing process, resulting in additional internal forces generated by the cable due to its own bending. CFRP cables have low shear strength, high friction coefficient, and significantly reduced tensile strength when bent. The nodes under the struts connect the annular cables, diagonal cables, and vertical struts, and are key components that fully utilize the structural advantages. If conventional steel cable node connection devices are used, CFRP cables are prone to shear failure or bending, resulting in large prestress losses during the prestressing process. Summary of the invention

[0006] In order to solve the problems raised in the background technology, the purpose of the present invention is to propose a node connection device under the cable structure strut suitable for CFRP cables, which can effectively connect the CFRP annular cables, CFRP diagonal cables and strut components at the nodes, while also improving the problems of shear failure, bending and folding, and large prestress loss of CFRP cables at the nodes.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] A cable structure strut lower node connection device suitable for CFRP cables, the connection device comprises an annular continuous cable connection component, an oblique discontinuous cable connection component, and a vertical strut connection component. The annular continuous cable connection component comprises a fixed end body, a CFRP annular cable, a cableway cover, a first radial joint bearing, and a polytetrafluoroethylene sleeve; the oblique discontinuous cable connection component comprises an oblique ear plate, a CFRP oblique cable, an oblique cable anchor, a fork ear, a second radial joint bearing, a stop groove, and a pin shaft; the vertical strut connection component comprises a vertical ear plate and a round hole.

[0009] The fixed end body is provided with an arc-shaped cable groove, and the curvature of the arc-shaped cable groove is consistent with the curvature of the polytetrafluoroethylene sleeve, the CFRP annular cable, and the upper protrusion of the cableway cover plate.

[0010] The cableway cover plate is connected to the fixed end body by bolts to fix the CFRP annular cable covered with the polytetrafluoroethylene sleeve in the arc-shaped cable groove.

[0011] The first radial spherical bearing and the fixed end body are connected at the end of the arc-shaped cable groove by bolts.

[0012] The arc length of the polytetrafluoroethylene sleeve is smaller than the arc length of the arc-shaped cable groove.

[0013] The cross-sectional radius of the arc-shaped cable groove is not less than the outer diameter of the polytetrafluoroethylene sleeve.

[0014] The second spherical bearing outer ring is fixed to the hinge hole of the oblique ear plate through the retaining groove, and the second spherical bearing inner ring is connected to the hinge hole of the fork ear through the pin shaft.

[0015] The fork ear is fixedly connected to the oblique cable anchor, and the CFRP oblique cable is fixedly connected to the oblique cable anchor.

[0016] By adopting the above technical scheme, a node connection device under the strut of a cable structure suitable for CFRP cables of the present invention effectively connects components in different directions, which is convenient for installation and maintenance; by installing a polytetrafluoroethylene sleeve with a low friction coefficient, the friction between the CFRP annular cable and the arc-shaped cable groove and the cableway cover plate is reduced, thereby reducing the prestress loss during the prestress application process; when the displacements of various nodes of the cable structure are not coordinated during the construction process or under the load state, the rotatable inner ring of the radial spherical bearing is utilized to allow the CFRP annular cable at the end of the arc-shaped cable groove and the CFRP oblique cable at the oblique ear plate to rotate freely, thereby reducing the stress concentration caused by the flexural deformation of the CFRP cable at the node due to the inability to rotate, that is, the bending of the CFRP cable at the node is improved by means of a hinged connection, thereby improving the tensile strength and shear resistance of the CFRP cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a general diagram of a lower node connection device of a cable structure strut suitable for CFRP cables according to the present invention;

[0018] Figure 2 This is a layout diagram of the vertical brace connecting components of the present invention;

[0019] Figure 3 This is a layout diagram of the annular continuous cable connection components of the present invention;

[0020] Figure 4 It is a partial layout diagram of the oblique discontinuous cable connection component of the present invention;

[0021] Figure 5 A top view of a lower node connection device of a cable structure strut suitable for CFRP cables according to the present invention;

[0022] Description of reference numerals:

[0023] 1-annular continuous cable connecting component; 2-oblique non-continuous cable connecting component; 3-vertical strut connecting component; 1-1 fixed end body; 1-2-CFRP annular cable; 1-3-cableway cover plate; 1-4-first radial spherical bearing; 1-5-polytetrafluoroethylene sleeve, 1-6-arc-shaped cable groove; 2-1-oblique ear plate; 2-2-CFRP oblique cable; 2-3-oblique cable anchor; 2-4-fork ear; 2-5-second radial spherical bearing; 2-6-stop groove; 2-7-pin shaft; 3-1-vertical ear plate; 3-2-round hole. DETAILED DESCRIPTION

[0024] The following describes a cable structure strut lower node connection device applicable to CFRP cables proposed by the present invention in conjunction with specific embodiments, so as to facilitate a clear understanding of the present invention, but does not constitute a limitation to the present invention.

[0025] like Figure 1 and Figure 2 As shown, the present invention discloses a cable structure strut lower node connection device suitable for CFRP cables, comprising an annular continuous cable connection component 1, an oblique discontinuous cable connection component 2, and a vertical strut connection component 3. The annular continuous cable connection component 1 comprises a fixed end body 1-1, a CFRP annular cable 1-2, a cableway cover plate 1-3, a first radial spherical bearing 1-4, and a polytetrafluoroethylene sleeve 1-5; the oblique discontinuous cable connection component 2 comprises an oblique ear plate 2-1, a CFRP oblique cable 2-2, an oblique cable anchor 2-3, a fork ear 2-4, a second radial spherical bearing 2-5, a retaining groove 2-6, and a pin 2-7; the vertical strut connection component 3 comprises a vertical ear plate 3-1 for connecting a rod in the vertical direction, and a circular hole 3-2 for passing the CFRP annular cable.

[0026] like Figure 2 and Figure 3 As shown, the fixed end body is provided with arc-shaped cable grooves 1-6, and the arc-shaped cable grooves pass through the CFRP annular cable. The CFRP annular cable is sleeved with the polytetrafluoroethylene sleeve to reduce the friction between the CFRP annular cable and the arc-shaped cable groove and the cableway cover plate, and reduce the prestress loss at the same time. The curvature of the arc-shaped cable groove is consistent with the curvature of the polytetrafluoroethylene sleeve, the CFRP annular cable, and the upper protrusion of the cableway cover plate. The cableway cover plate and the fixed end body are connected by bolts to fix the CFRP annular cable sleeved with the polytetrafluoroethylene sleeve in the arc-shaped cable groove. The first radial spherical bearing and the fixed end body are connected to the end of the arc-shaped cable groove by bolts, so that the CFRP annular cable at the end of the arc-shaped cable groove can rotate to a certain extent to reduce the lateral force caused by the change of the node position relationship. The arc length of the polytetrafluoroethylene sleeve is less than the arc length of the cable groove, so that it does not affect the operation of the first spherical bearing. The cross-sectional radius of the arc-shaped cable groove is not less than the outer diameter of the polytetrafluoroethylene sleeve.

[0027] like Figure 4 and Figure 5 As shown, the outer ring of the second spherical bearing is fixed to the hinge hole of the oblique ear plate through the retaining groove, and the inner ring of the second spherical bearing is connected to the hinge hole of the fork ear through the pin shaft. The fork ear is fixedly connected to the oblique cable anchor, and the CFRP oblique cable is fixedly connected to the oblique cable anchor.

[0028] The embodiments are preferred implementations of the present invention, but the present invention is not limited to the above implementations. Without departing from the essence of the present invention, other obvious changes or modifications can be made by those skilled in the art based on the above description, which should be included in the protection scope of the present invention.

Claims

1. A node connection device for a cable structure strut applicable to a CFRP cable, characterized in that: The connecting device comprises an annular continuous cable connecting component (1), an oblique discontinuous cable connecting component (2), and a vertical strut connecting component (3); the oblique discontinuous cable connecting component (2) is mounted on the annular continuous cable connecting component (1), the oblique discontinuous cable connecting component (2) and the vertical strut connecting component (3) are an integrated structure, and the oblique discontinuous cable connecting component (2) is provided with the vertical strut connecting component (3); The annular continuous cable connection component (1) comprises a fixed end body (1-1), a CFRP annular cable (1-2), a cableway cover plate (1-3), a first radial joint bearing (1-4), and a polytetrafluoroethylene sleeve (1-5); the CFRP annular cable (1-2) is installed on the fixed end body (1-1) through the cableway cover plate (1-3), and the end of the CFRP annular cable (1-2) is provided with a first radial joint bearing (1-4); the connection between the CFRP annular cable (1-2) and the cableway cover plate (1-3) is provided with a polytetrafluoroethylene sleeve (1-5); The oblique discontinuous cable connection component (2) comprises an oblique ear plate (2-1), a CFRP oblique cable (2-2), an oblique cable anchor (2-3), a fork ear (2-4), a second radial joint bearing (2-5), a retaining groove (2-6) and a pin (2-7); the oblique ear plate (2-1) and the fork ear (2-4) are connected via the pin (2-7); a second radial joint bearing (2-5) is provided between the oblique ear plate (2-1) and the pin (2-7), and the second radial joint bearing (2-5) is installed in the retaining groove (2-6); the end of the fork ear (2-4) fixes the CFRP oblique cable (2-2) via the oblique cable anchor (2-3); The vertical strut connecting component (3) comprises a vertical ear plate (3-1) and a circular hole (3-2); the vertical ear plate (3-1) is used to connect a rod in a vertical direction, and the circular hole (3-2) is used to pass the CFRP annular cable (1-2).

2. A cable structure strut lower node connection device suitable for CFRP cables according to claim 1, characterized in that: The fixed end body (1-1) is provided with an arc-shaped cable groove (1-6), and the curvature of the arc-shaped cable groove (1-6) is consistent with the curvature of the polytetrafluoroethylene sleeve (1-5), the CFRP annular cable (1-2), and the upper protrusion of the cableway cover plate (1-3); the cableway cover plate (1-3) and the fixed end body (1-1) are connected by bolts to fix the CFRP annular cable (1-2) covered with the polytetrafluoroethylene sleeve (1-5) in the arc-shaped cable groove (1-6); the first radial spherical bearing (1-4) and the fixed end body (1-1) are connected at the end of the arc-shaped cable groove (1-6) by bolts.

3. A cable structure strut lower node connection device suitable for CFRP cables according to claim 2, characterized in that: The arc length of the polytetrafluoroethylene sleeve (1-5) is smaller than the arc length of the arc-shaped cable groove; and the cross-sectional radius of the arc-shaped cable groove (1-6) is not smaller than the outer diameter of the polytetrafluoroethylene sleeve (1-5).

4. The cable structure strut lower node connection device applicable to CFRP cables according to claim 1, characterized in that: The outer ring of the second radial spherical bearing (2-5) is fixed to the hinge hole of the oblique ear plate (2-1) through the retaining groove (2-6), and the inner ring of the second radial spherical bearing (2-5) is connected to the hinge hole of the fork ear through the pin shaft.

5. The cable structure strut lower node connection device applicable to CFRP cables according to claim 1, characterized in that: The fork ear is fixedly connected to the oblique cable anchor, and the CFRP oblique cable is fixedly connected to the oblique cable anchor.

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