A cable structure support rod lower node connecting device suitable for CFRP cable

Abstract

The application discloses a cable structure support rod lower node connecting device suitable for CFRP cable, and belongs to the technical field of building structures, which comprises a circumferential continuous cable connecting part, an oblique discontinuous cable connecting part and a vertical support rod connecting part. The circumferential continuous cable connecting part comprises a fixed end main body, a CFRP circumferential cable, a cable road 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 support rod connecting part comprises a vertical lug plate and a round hole. The device effectively connects parts in different directions, is convenient to install and maintain, and reduces prestress loss. By improving the bending and folding of the CFRP cable at the node, the tensile strength and the shearing capacity of the CFRP cable are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building structures, and in particular to a cable structure strut lower node connecting device suitable for CFRP cables. BACKGROUND

[0002] Cable structures are prestressed structural systems formed by cables as the main force members. Such structures fully utilize the tensile properties of high-strength cables, and improve the internal force distribution and deformation characteristics of the structure by applying prestress, making the structure more economical and efficient, and thus well applied in the field of spatial structures.

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

[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 improve the structural span, increase the structural durability, meet the lightweight requirements of the structure, and better utilize the characteristics of cable structures, making the development prospects of the structure more promising.

[0005] The positional relationship between the nodes of a cable structure is difficult to change coordinately during prestress application and under load, resulting in additional internal forces due to bending and buckling of the cable. CFRP cables have low shear strength, high friction coefficient, and significantly reduced tensile strength when bent and buckled. The strut lower node connecting ring cable, diagonal cable and vertical strut are key components for fully utilizing the advantages of the structure. If conventional steel cable node connecting devices are used, CFRP cables are prone to shear failure or bending and buckling, resulting in significant prestress loss during prestress application. SUMMARY

[0006] To solve the problems raised in the background art, the present application aims to provide a cable structure strut lower node connecting device suitable for CFRP cables, which can effectively connect CFRP ring cables, CFRP diagonal cables and strut components, and also improve the problems of shear failure, bending and buckling of CFRP cables at the node, and large prestress loss.

[0007] To achieve the above-mentioned purposes, the technical solution adopted by the present application is as follows:

[0008] The application discloses a cable structure support rod lower node connecting device suitable for CFRP cables, which comprises a circumferential continuous cable connecting component, an oblique discontinuous cable connecting component and a vertical support rod connecting component.

[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 circumferential cable and the upper protrusion of the cable cover plate.

[0010] The cable cover plate is connected with the fixed end body through a bolt to fix the CFRP circumferential cable with the polytetrafluoroethylene sleeve in the arc-shaped cable groove.

[0011] The first centripetal joint bearing is connected with the fixed end body through a bolt at the end of the arc-shaped cable groove.

[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 outer ring of the second joint bearing is fixed to the hinged hole of the oblique ear plate through the stop groove, and the inner ring of the second joint bearing is connected with the hinged hole of the fork ear through the pin shaft.

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

[0016] The technical scheme has the advantages that the cable structure support rod lower node connecting device suitable for CFRP cables effectively connects components in different directions, is convenient to install and maintain, reduces the friction force between the CFRP circumferential cable and the arc-shaped cable groove and the cable cover plate by installing the polytetrafluoroethylene sleeve with low friction coefficient, reduces the prestress loss in the prestress application process, and when the node displacement of the cable structure is not coordinated during construction or in a bearing state, the CFRP circumferential cable at the end of the arc-shaped cable groove and the CFRP oblique cable at the oblique ear plate can freely rotate by utilizing the rotatable characteristics of the inner ring of the centripetal joint bearing, so that the stress concentration caused by the flexural deformation of the CFRP cable at the node due to the inability to rotate is reduced, the bending and folding of the CFRP cable at the node is improved by the hinged connection, and the tensile strength and shear capacity of the CFRP cable are improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 A cable structure support rod lower node connecting device suitable for CFRP cable according to the present application;

[0018] Figure 2 A vertical support rod connecting component arrangement according to the present application;

[0019] Figure 3 A ring continuous cable connecting component arrangement according to the present application;

[0020] Figure 4 An inclined discontinuous cable connecting component partial arrangement according to the present application;

[0021] Figure 5 A cable structure support rod lower node connecting device suitable for CFRP cable according to the present application;

[0022] BRIEF DESCRIPTION OF DRAWINGS

[0023] 1-ring continuous cable connecting component; 2-inclined discontinuous cable connecting component; 3-vertical support rod connecting component; 1-1 fixed end body; 1-2-CFRP ring cable; 1-3-cable cover plate; 1-4-first centripetal joint bearing; 1-5-polytetrafluoroethylene sleeve, 1-6-arc-shaped cable groove; 2-1-inclined ear plate; 2-2-CFRP inclined cable; 2-3-inclined cable anchor; 2-4-fork ear; 2-5-second centripetal joint bearing; 2-6-stop groove; 2-7-pivot shaft; 3-1-vertical ear plate; 3-2-round hole. DETAILED DESCRIPTION

[0024] A cable structure support rod lower node connecting device suitable for CFRP cable according to the present application is described below in conjunction with specific embodiments, so as to clearly understand the present application, but does not constitute a limitation on the present application.

[0025] As shown in Figure 1 and Figure 2 A cable structure support rod lower node connecting device suitable for CFRP cable according to the present application, comprising a ring continuous cable connecting component 1, an inclined discontinuous cable connecting component 2, and a vertical support rod connecting component 3. The ring continuous cable connecting component 1 comprises a fixed end body 1-1, a CFRP ring cable 1-2, a cable cover plate 1-3, a first centripetal joint bearing 1-4, and a polytetrafluoroethylene sleeve 1-5; the inclined discontinuous cable connecting component 2 comprises an inclined ear plate 2-1, a CFRP inclined cable 2-2, an inclined cable anchor 2-3, a fork ear 2-4, a second centripetal joint bearing 2-5, a stop groove 2-6, and a pivot shaft 2-7; the vertical support rod connecting component 3 comprises a vertical ear plate 3-1 for connecting a vertical rod, and a round hole 3-2 for passing through the CFRP ring cable.

[0026] As shown in Figure 2 andFigure 3 As shown in the drawings, the fixed end body is provided with an arc-shaped cable groove 1-6, and the CFRP ring cable is passed through the arc-shaped cable groove. The CFRP ring cable is sleeved with a polytetrafluoroethylene sleeve to reduce the friction between the CFRP ring cable and the arc-shaped cable groove and the cable cover plate, and to reduce the prestress loss. The curvature of the arc-shaped cable groove is consistent with the curvature of the polytetrafluoroethylene sleeve, the CFRP ring cable and the upper protrusion of the cable cover plate. The cable cover plate and the fixed end body are connected by bolts to fix the CFRP ring cable sleeved with the polytetrafluoroethylene sleeve in the arc-shaped cable groove. The first centripetal knuckle bearing is connected to the fixed end body by bolts at the end of the arc-shaped cable groove, so that the CFRP ring cable at the end of the arc-shaped cable groove can rotate to a certain extent to reduce the transverse stress 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 it does not affect the operation of the first knuckle bearing. The cross-sectional radius of the arc-shaped cable groove is not less than the outer diameter of the polytetrafluoroethylene sleeve.

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

[0028] The embodiments are preferred embodiments of the present application, but the present application is not limited to the above embodiments. Based on the above description, other obvious changes or modifications can be made by those skilled in the art without departing from the essential content of the present application, and all should be covered within the protection scope of the present application.

Claims

1. A cable structure strut lower node connection device suitable for use with a CFRP cable, characterised in that: The connecting device comprises a circumferential continuous cable connecting part (1), an inclined discontinuous cable connecting part (2), and a vertical bracing rod connecting part (3); the inclined discontinuous cable connecting part (2) is installed on the circumferential continuous cable connecting part (1), and the inclined discontinuous cable connecting part (2) and the vertical bracing rod connecting part (3) are in an integrated structure, and the inclined discontinuous cable connecting part (2) is provided with the vertical bracing rod connecting part (3); The circumferential continuous cable connecting part (1) comprises a fixed end body (1-1), a CFRP circumferential cable (1-2), a cable cover plate (1-3), a first centripetal joint bearing (1-4), and a polytetrafluoroethylene sleeve (1-5); the CFRP circumferential cable (1-2) is installed on the fixed end body (1-1) through the cable cover plate (1-3), and the end of the CFRP circumferential cable (1-2) is provided with the first centripetal joint bearing (1-4); and the connection part of the CFRP circumferential cable (1-2) and the cable cover plate (1-3) is provided with the polytetrafluoroethylene sleeve (1-5); The inclined discontinuous cable connecting part (2) comprises an inclined ear plate (2-1), a CFRP inclined cable (2-2), an inclined cable anchor (2-3), a fork ear (2-4), a second centripetal joint bearing (2-5), a stop groove (2-6), and a pin shaft (2-7); the inclined ear plate (2-1) and the fork ear (2-4) are connected through the pin shaft (2-7); the second centripetal joint bearing (2-5) is arranged between the inclined ear plate (2-1) and the pin shaft (2-7), and the second centripetal joint bearing (2-5) is installed in the stop groove (2-6); the end of the fork ear (2-4) is fixed with the CFRP inclined cable (2-2) through the inclined cable anchor (2-3); The vertical bracing rod connecting part (3) comprises a vertical ear plate (3-1) and a circular hole (3-2); the vertical ear plate (3-1) is used for connecting a vertical rod, and the circular hole (3-2) is used for penetrating the CFRP circumferential cable (1-2); The fixed end body (1-1) is provided with an arc-shaped cable groove (1-6), the curvature of the arc-shaped cable groove (1-6) is consistent with the curvature of the polytetrafluoroethylene sleeve (1-5), the CFRP circumferential cable (1-2), and the upper protrusion of the cable cover plate (1-3); the cable cover plate (1-3) and the fixed end body (1-1) are connected through bolts to fix the CFRP circumferential cable (1-2) with the polytetrafluoroethylene sleeve (1-5) in the arc-shaped cable groove (1-6), and the first centripetal joint bearing (1-4) and the fixed end body (1-1) are connected through bolts at the end of the arc-shaped cable groove (1-6); 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 less than the outer diameter of the polytetrafluoroethylene sleeve (1-5).

2. A lower node connecting device for a cable structure strut of a CFRP cable, according to claim 1, characterized in that: The outer ring of the second centripetal joint bearing (2-5) is fixed to the hinge hole of the inclined ear plate (2-1) through the stop groove (2-6), and the inner ring of the second centripetal joint bearing (2-5) is connected to the hinge hole of the fork ear through the pin shaft.

3. A lower node connecting device for a cable structure strut of a CFRP cable, according to claim 1, characterized in that: The fork is fixed with the diagonal cable anchor, and the CFRP diagonal cable is fixed with the diagonal cable anchor. The fork is fixed with the diagonal cable anchor, and the CFRP diagonal cable is fixed with the diagonal cable anchor.

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