CN108412037A - A kind of assembled hollow hub node applied to grid shell - Google Patents

Abstract

The invention discloses an assembled hollow hub node applied to a cable-stayed reticulated shell, which is used to connect rods that need to be assembled, including a hub body, a sealing plate, a clamp, a sleeve and a cable. There are bolt holes on the connecting surface, the hub body is connected with the sealing plate through high-strength bolts, the sealing plate is fixedly connected with the rod, the sleeve is set on the high-strength bolt between the hub body and the sealing plate, and the high-strength bolt is provided with a sliding The sleeve is provided with fastening pins matching the chute; the upper and lower ends of the hub body are respectively provided with cover plates with bolt holes, and the cover plates are provided with through-hole bolts; the clamp is arranged under the hub body, The cable passes through the fixture. The fixture is divided into upper plate, middle plate and lower plate. Threaded holes for connection and fixing by bolts. This node can improve construction accuracy, save construction period, and effectively avoid residual stress caused by on-site welding.

Description

An Assembled Hollow Hub Node Applied to Cable-stayed Reticulated Shells

technical field

The invention relates to a node structure in construction engineering, in particular to an assembled hollow hub node applied to a large-span cable-stayed lattice shell.

Background technique

The cable-braced structure is a mixed structure composed of rigid rods and flexible cables. Each diagonal of the quadrilateral grid is connected by cables, which has good mechanical performance and wide applicability. At present, most of the joints in the cable support structure are welded joints, such as clapboard welded joints, thick-walled steel pipe joints, etc. The welded joints need to be assembled and welded on site. The construction is cumbersome, which is not conducive to the development of building industrialization, and too many welds will affect the joints. Stress performance. The above factors restrict the popularization and application of cable-stayed reticulated shells.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies in the prior art and provide an assembled hollow hub node applied to cable-stayed reticulated shells, which can realize the assembled construction of single-layer cable-stayed reticulated shells, improve construction accuracy, and save The construction period can effectively avoid the residual stress caused by on-site welding. At the same time, it can realize the installation and tensioning of the lower cables, effectively prevent the phenomenon of "false tightening" of bolts, and effectively guarantee the joint stiffness, bearing capacity and anchoring efficiency of cables, which is beneficial to the further promotion of single-layer cable-stayed reticulated shells application. In addition, it has excellent mechanical properties and can realize on-site assembly construction of nodes and cables.

The purpose of the present invention is achieved through the following technical solutions:

An assembled hollow hub node applied to a cable-stayed reticulated shell, used to connect rods that need to be assembled, including a hub body, a sealing plate, a clamp, a sleeve and a cable, and the outer wall of the hub is cut and provided with a connecting surface, Bolt holes are provided on the connecting surface, the hub body is connected with the sealing plate through high-strength bolts, the sealing plate is fixedly connected with the rod, and the sleeve is set on the high-strength bolt between the hub body and the sealing plate Above, the high-strength bolt is provided with a chute, and the sleeve is provided with a fastening pin matching the chute; the upper and lower ends of the hub body are respectively provided with cover plates with bolt holes, There is a through-hole bolt on the cover plate; the clamp is arranged under the hub body, the cable passes through the clamp, and the clamp is divided into an upper plate, a middle plate and a lower plate, and the upper plate is provided with a The central threaded holes are fixed by bolts, and four threaded holes are correspondingly provided around the upper plate, the middle plate and the lower plate respectively for connecting and fixing by bolts.

Further, each hub body is provided with 4-8 connection surfaces, and each connection surface is provided with at least two bolt holes.

Further, the width of the connection surface is greater than the outer diameter of the sleeve.

Further, arc-shaped gaskets for connecting with high-strength bolts are arranged inside the hub body.

Further, a hoop stiffener may be provided in the hub body.

Further, there are arc-shaped grooves in contact with the cables between the upper plate and the middle plate, and between the middle plate and the lower plate.

Compared with the prior art, the beneficial effects brought by the technical solution of the present invention are:

1. The force transmission path of the node of the present invention is clear: when the node is subjected to axial pressure, the axial force is transmitted to the hub body by the sleeve; when the node is subjected to axial tension, the axial force is transmitted to the hub body by high-strength bolts; When the bending moment acts on the inside and outside of the shell plane, the bending moment is transmitted to the hub body by the high-strength bolts in the tension zone and the sleeve in the compression zone.

2. The bearing capacity characteristics of the joints of the present invention are jointly determined by the bearing capacity of high-strength bolts, sleeves and the hub body. When the bearing capacity of the hub body is insufficient, ring stiffeners can be added, and the upper and lower cover plates can also improve the hollowness. Rigidity and bearing capacity of the hub.

3. The flexural rigidity and bearing capacity of the joints of the present invention outside the shell plane are superior to those of traditional bolted joints.

4. After the nodes of the present invention are prefabricated in the factory, quick assembly and repeated disassembly can be realized on site, and the cables and clamps are placed under the nodes to facilitate tensioning and clamping of the cables.

Description of drawings

Fig. 1 is a schematic structural diagram of a node of the present invention.

Figures 2-1 to 2-4 are structural schematic diagrams of high-strength bolts, sleeves, sealing plates, and arc-shaped gaskets.

Fig. 3 is a structural schematic diagram of the clamp part.

Fig. 4 is a schematic structural view of a hub body provided with circumferential stiffeners.

Reference signs: 1-hub body, 2-high-strength bolt, 3-sleeve, 4-arc gasket, 5-sealing plate, 6-rod, 7-through-core bolt, 8-cover plate, 9-fixture , 10-cable, 11-bolt, 12-chute, 13-fastening pin, 14-center threaded hole, 15-threaded hole

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

As shown in Figures 1 to 3, an assembled hollow hub node applied to cable-stayed reticulated shells is used to connect rods 6 that need to be assembled, including hub body 1, sealing plate 5, clamp 9, sleeve 3 and The cable 10 is provided with a connecting surface by cutting the outer wall of the hub body 1. In this embodiment, the hub body 1 is made of thick-walled steel pipe or round steel by cutting, milling, drilling and other processes, and the connecting surface is provided with bolt holes. The central axis of the bolt hole is perpendicular to the central axis of the hub body 1 .

The hub body 1 is connected with the sealing plate 5 through high-strength bolts 2, the sealing plate 5 and the rod 6 are connected by welding, the sleeve 3 is arranged on the high-strength bolt 2 between the hub body 1 and the sealing plate 5, and the high-strength bolt 2 is provided The chute 12, the sleeve 3 is provided with the fastening pin 13 matched with the chute 12; the high-strength bolt 2 in this embodiment needs to meet the "High-strength Bolts for Steel Grid Frame Bolt Ball Joints" (GB/T16939-1997) Requirements, it is necessary to ensure that the thread can be screwed out at least 3 pitches after the nut is tightened, and the bolts do not collide with each other. The bolt type is determined by the force of the node. The material of the sleeve 3 should be Q235, Q345 or No. 45 steel, and should meet the requirements of GB/T700, GB/T1591 and CB/T699 respectively; the sealing plate 5 can be made by cutting steel plates, milling grooves and drilling holes. The two ends of the rod 6 are connected with the sealing plate 5 by a fully penetrated butt weld to ensure equal strength.

The upper and lower ends of the hub body 1 are respectively provided with cover plates 8 with bolt holes, and the cover plate 8 is provided with a through-hole bolt 7 through the bolt holes; the clamp 9 is arranged under the hub body 1, and the drag cable 10 passes through the clamp 9, and the clamp 9 9 is divided into an upper plate, a middle plate and a lower plate. The upper plate is provided with a central threaded hole 14 for connecting and fixing with the through-hole bolt 7, and four threaded holes 15 are correspondingly provided around the upper plate, the middle plate and the lower plate. , for connecting and fixing by bolt 11. In addition, there are arc-shaped grooves in contact with the cables between the upper plate and the middle plate, and between the middle plate and the lower plate.

Preferably, when the strength of the hub body 1 is insufficient, a circumferential stiffener can be provided, as shown in FIG. 4 , and an arc-shaped gasket 4 for connecting with high-strength bolts is provided inside the hub body.

Preferably, the effective depth of the through bolt 7 and the bolt 11 screwed into the upper plate of the fixture should not be less than 1.1 times the nominal diameter of the thread.

The present invention is not limited to the embodiments described above. The above description of the specific embodiments is intended to describe and illustrate the technical solution of the present invention, and the above specific embodiments are only illustrative and not restrictive. Without departing from the gist of the present invention and the scope of protection of the claims, those skilled in the art can also make many specific changes under the inspiration of the present invention, and these all belong to the protection scope of the present invention.

Claims (6)

1. An assembled hollow hub node applied to a cable-stayed reticulated shell, used to connect rods that need to be assembled, characterized in that it includes a hub body, a sealing plate, a clamp, a sleeve and a drag cable, and the outer wall of the hub is The cutting is provided with a connecting surface, the connecting surface is provided with bolt holes, the hub body is connected with the sealing plate through high-strength bolts, the sealing plate is fixedly connected with the rod, and the sleeve is arranged between the hub body and the sealing plate. On the high-strength bolts between the plates, the high-strength bolts are provided with slide grooves, and the sleeves are provided with fastening pins matched with the slide grooves; the upper and lower ends of the hub body are respectively equipped with The cover plate of the bolt hole is provided with a through bolt; the clamp is arranged under the hub body, the cable passes through the clamp, and the clamp is divided into an upper plate, a middle plate and a lower plate, and the upper plate is provided with a For the central threaded hole connected and fixed with the through-hole bolt, four threaded holes are correspondingly provided around the upper plate, the middle plate and the lower plate, respectively, for connecting and fixing by bolts. 2. An assembled hollow hub node applied to a cable-stayed reticulated shell according to claim 1, wherein each hub body is provided with 4-8 connection surfaces, and each connection surface is provided with at least two bolt holes. 3. An assembled hollow hub node applied to a cable-stayed reticulated shell according to claim 1, wherein the width of the connecting surface is greater than the outer diameter of the sleeve. 4. An assembled hollow hub node applied to a cable-stayed reticulated shell according to claim 1 or 2, wherein arc-shaped gaskets for connecting with high-strength bolts are arranged inside the hub body. 5. An assembled hollow hub node applied to a cable-stayed reticulated shell according to claim 1 or 2, characterized in that a hoop stiffener can be arranged in the hub body. 6. An assembled hollow hub node applied to a cable-stayed reticulated shell according to claim 1, wherein an arc contacting with the cable is provided between the upper plate and the middle plate, and between the middle plate and the lower plate. groove.