BOLTED JOINT WITH DRUM-SHAPED SPHERICAL SHELL FOR CONNECTING CIRCULAR STEEL TUBE BRACE

Abstract

A bolted joint with a drum-shaped spherical shell for connecting a circular steel tube brace, including a drum-shaped spherical shell and N connecting members, connecting members each include a curved European nut, a bolt for space trusses, a sleeve, a sealing plate (or a conehead) and a circular steel tube. There are at least three forms: a corner drum, a half drum and a full drum. Specifications of the high-strength bolt for space trusses are determined, and the geometric dimensions, tensile and compressive bearing capacity of the joint are selected. The bolted joint has clear force transmission and a small deviation between theoretically analyzed stress and actual stress; has no eccentricity, can be finely adjusted and has reliable mechanical performance; is in bolted connection and is installed efficiently; and is not convex, thereby facilitating wallboard installation and indoor decoration.

Claims

1. A bolted joint with a drum-shaped spherical shell for connecting a circular steel tube brace, the bolted joint comprising: a drum-shaped spherical shell; and a plurality of connecting members, wherein the drum-shaped spherical shell is formed by: an upper-end circular plane cover plate; and a lower-end circular plane cover plate having a spherical connecting surface connected therebetween, wherein a center of the upper-end or lower-end circular plane cover plate is provided with a mounting hole, the spherical connecting surface is provided with one or more connecting holes, and centers of the plurality of connecting holes are positioned on the same connecting plane; the connecting members each comprise: a curved European nut; a high-strength bolt for space trusses; a sleeve; a sealing plate or a conehead; and a circular steel tube, wherein the high-strength bolt for space trusses is pre-installed at one end of the circular steel tube through the sealing plate or the conehead, the sleeve sleeves the high-strength bolt for space trusses through a fastening screw, and a free end of the high-strength bolt for space trusses passes through the connecting holes in the spherical connecting surface of the drum-shaped spherical shell and then is fixed by the curved European nut; and the plurality of connecting members are centered on the spherical connecting surface of the drum-shaped spherical shell.

2. The bolted joint with a drum-shaped spherical shell for connecting a circular steel tube brace according to claim 1, wherein parallel double ribs are arranged on two sides of the connecting hole located in the spherical connecting surface in the drum-shaped spherical shell.

3. The bolted joint with a drum-shaped spherical shell for connecting a circular steel tube brace according to claim 1, wherein a sealing plate is disposed outside the mounting hole of the circular plane cover plate.

4. The bolted joint with a drum-shaped spherical shell for connecting a circular steel tube brace according to claim 1, wherein a thickness of the circular plane cover plate is greater than a wall thickness of the spherical connecting surface.

5. The bolted joint with a drum-shaped spherical shell for connecting a circular steel tube brace according to claim 1, wherein a diameter of the mounting hole is greater than an external diameter of the curved European nut, and is of an external diameter of the circular plane cover plate.

6. The bolted joint with a drum-shaped spherical shell for connecting a circular steel tube brace according to claim 1, wherein a diameter d of the connecting hole in the spherical connecting surface is equal to d+4 mm, wherein d is a diameter of the high-strength bolt for space trusses.

7. The bolted joint with a drum-shaped spherical shell for connecting a circular steel tube brace according to claim 1, wherein a top end of the curved European nut is a hexagonal prism.

8. The bolted joint with a drum-shaped spherical shell for connecting a circular steel tube brace according to claim 1, wherein when a tube diameter of the circular steel tube is greater than 76 mm, the conehead is selected for connection, and when the tube diameter of the circular steel tube is less than or equal to 76 mm, the sealing plate is selected for connection.

9. The bolted joint with a drum-shaped spherical shell for connecting a circular steel tube brace according to claim 1, wherein one side of the sleeve in contact with the spherical connecting surface is provided with a spherical surface matched with the surface of the sleeve; or a single-sided concave washer is arranged between the sleeve and the spherical connecting surface.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG. 1 is a schematic structural diagram of the present invention;

[0025] FIG. 2a is a schematic structural diagram of a connecting member (a sealing plate);

[0026] FIG. 2b is a schematic structural diagram of another connecting member (a conehead);

[0027] FIG. 3 is a front view of an unribbed drum-shaped spherical shell;

[0028] FIG. 3a is a sectional view of FIG. 3 taken along A.sub.1-A.sub.1;

[0029] FIG. 3b is a schematic view of FIG. 3 taken along A.sub.2-A.sub.2;

[0030] FIG. 4 is a front view of a ribbed drum-shaped spherical shell;

[0031] FIG. 4a is a sectional view of FIG. 4 taken along B.sub.1-B.sub.1;

[0032] FIG. 4b is a schematic view of FIG. 4 taken along B.sub.2-B.sub.2;

[0033] FIG. 5 is a front view of a curved European nut;

[0034] FIG. 5a is a sectional view of FIG. 5 taken along C.sub.1-C.sub.1;

[0035] FIG. 5b is a vertical view of FIG. 5 taken along C.sub.2-C.sub.2;

[0036] FIG. 6 is a schematic diagram of a sleeve;

[0037] FIG. 6a is a sectional view of FIG. 6 taken along D.sub.1-D.sub.1;

[0038] FIG. 7a is a sectional view of a sealing plate;

[0039] FIG. 7b is a sectional view of a conehead;

[0040] FIG. 8 is a front view of a high-strength bolt for space trusses;

[0041] FIG. 9a is a schematic diagram of a single layer brace;

[0042] FIG. 9a1 is a sectional view of a corner drum joint (joint 1);

[0043] FIG. 9a2 is a sectional view of a half drum joint (joint 2);

[0044] FIG. 9b is a schematic diagram of a double-layer brace;

[0045] FIG. 9b1 is a sectional view of a half drum joint (joint 3); and

[0046] FIG. 9b2 is a sectional view of a full drum joint (joint 4).

[0047] In the figure, 1. drum-shaped spherical shell, 2. curved European nut, 3. high-strength bolt for space trusses, 4. sleeve, 5. sealing plate, 6. conehead, 7. circular steel tube, 8. connecting member, 9. key groove (sliding groove JG/T October 2009), 10. double ribs, 11. circular plane cover plate, 12. spherical connecting surface, 13. mounting hole, 14. connecting hole.

DETAILED DESCRIPTION

[0048] Specific examples of the present invention are described in detail below with reference to the accompanying drawings.

[0049] As shown in FIG. 1, a bolted joint with a drum-shaped spherical shell for connecting a circular steel tube brace includes a drum-shaped spherical shell 1 and N connecting members 8.

[0050] As shown in FIGS. 2a and 2b, the connecting members 8 each include a curved European nut 2, a high-strength bolt 3 for space trusses, a sleeve 4, a sealing plate 5 (or a conehead 6) and a circular steel tube 7, where one end of the circular steel tube 7 is fixedly connected to one end of the sealing plate 5 (or the conehead 6) (when the conehead is connected, a large-diameter end of the conehead is connected). The high-strength bolt 3 for space trusses is preset in a bolt hole of the sealing plate 5 (or the conehead 6), and the sleeve 4 is fixedly connected to the preset high-strength bolt 3 for space trusses through a fastening screw. A free end of the high-strength bolt 3 for space trusses passes through connecting holes 14 in a spherical connecting surface 12 of the drum-shaped spherical shell 1 and then is fixed by the curved European nut 2; and the circular steel tube 7 is fixedly connected to the drum-shaped spherical shell 1 by the curved European nut 2 and the high-strength bolt 3 for space trusses. If the centers of the plurality of connecting holes 14 are located in the same connecting plane of the spherical connecting surface 12, then the N connecting members 8 are centered on the outer surface of the drum-shaped spherical shell 1, which belongs to a same plane.

[0051] As shown in FIGS. 3 and 3a, the drum-shaped spherical shell 1 is composed of the spherical connecting surface 12 and circular plane cover plates 11 at two ends. A fully welded groove butt weld is adopted for the circular plane cover plates 11 and the spherical connecting surface 12, and a thickness t of the circular plane cover plate is greater than a wall thickness T of the spherical connecting surface, thereby effectively using the constraint effect of the cover plate on the spherical shell.

[0052] As shown in FIGS. 4 and 4a, a ribbed drum-shaped spherical shell is only provided with parallel double ribs 10 on both sides of the bolt hole perpendicular to the direction of the cover plate, and other parts are the same as those of an unribbed drum-shaped spherical shell.

[0053] As shown in FIGS. 3b and 4b, the middle of the circular plane cover plate on one side is provided with a mounting hole 13, so that the curved European nut 2 is placed into the drum-shaped spherical shell 1, and an operation space is provided for installation. In order to ensure that the circular plane cover plate is stressed, a diameter D of the mounting hole 13 should be greater than an external diameter d of the curved European nut and smaller than of an external diameter of the circular plane cover plate.

[0054] In order to prevent the inside of the joint with the drum-shaped spherical shell from rusting, a sealing plate with a diameter greater than that of the mounting hole is added outside the mounting hole 13. The sealing plate and the circular plane cover plate are provided with four threaded holes according to a cross, and the two plates are connected by countersunk screws.

[0055] As shown in FIGS. 3 and 4, the spherical connecting surface 12 is provided with a bolt connecting hole 14, and the diameter of the connecting hole is equal to d+4 mm (d is the diameter of the high-strength bolt 3 for space trusses). The bolt 3 can be finely adjusted within 2 mm, and it is ensured that the circular steel tube is not subjected to eccentricity during installation.

[0056] As shown in FIGS. 5 and 5a, a bottom end of the curved European nut is provided with a curved surface, and its radius of curvature is the same as the radius of curvature of the spherical connecting surface, so that the curved European nut 2 can be attached to the spherical connecting surface 12.

[0057] As shown in FIGS. 5 and 5b, a top end of the curved European nut is a hexagonal prism. During installation, an L-shaped wrench can extend into the drum-shaped spherical shell 1 from the mounting hole 13 to fix the nut 2, so that the high-strength bolt 3 for space trusses can be screwed into the curved European nut 2 conveniently.

[0058] As shown in FIG. 6, a side of the sleeve 4 in contact with the spherical connecting surface 12 needs to be milled to form a spherical surface that is matched with the surface of the shell. Alternatively, the sleeve is a standard part, and a single-sided concave washer is arranged between the sleeve and the spherical connecting surface of the drum-shaped spherical shell.

[0059] As shown in FIG. 6a, the outer surface of the sleeve 4 is provided with a regular hexagon for screwing the high-strength bolt 3 for space trusses.

[0060] When a tube diameter of the circular steel tube 7 is greater than 76 mm, the conehead 6 (as shown in FIG. 7b) is usually selected for connection; and when the tube diameter of the circular steel tube 7 is less than or equal to 76 mm, the sealing plate 5 (as shown in FIG. 7a) is usually selected for connection, and the circular steel tube 7 is welded to the sealing plate 5 (or the conehead 6).

[0061] As shown in FIG. 8, a screw of the high-strength bolt 3 for space trusses is provided with a key groove 9 (a sliding groove JG/T 10-2009) where the fastening screw is clamped, which is used for fixedly connecting the sleeve 4 to the preset high-strength bolt 3 for space trusses through the fastening screw.

[0062] The value range of N which is the number of the connecting member 8 depends on the position of the joint in a steel tube brace system, and the drum-shaped spherical shell 1 may be in various forms such as corner drum, half drum and full drum.

[0063] When the single-layer brace shown in FIG. 9a is adopted, as shown in FIG. 9a1, a corner drum joint 1 is provided with a connecting member 8; and as shown in FIG. 9a2, a half drum joint 2 is provided with two connecting members 8.

[0064] When the double-layer brace shown in FIG. 9b is adopted, as shown in FIG. 9b1, a half drum joint 3 is provided with three connecting members 8; and as shown in FIG. 9b2, a full drum joint 4 is provided with four connecting members 8.

[0065] In summary, in the present invention, according to different positions of the joint in a bracing system, there are three forms: the corner drum, the half drum and the full drum. In practical application, the specifications of the high-strength bolt for space trusses are determined, and the geometric dimensions of each part of the joint and the tensile and compressive bearing capacity of the joint are selected. The bolted joint with a drum-shaped spherical shell for connecting a circular steel tube brace has clear force transmission and a small deviation between theoretically analyzed stress and actual stress; has no eccentricity, can be finely adjusted and has reliable mechanical performance; is in bolted connection and is installed efficiently; and is not convex, thereby facilitating wallboard installation and indoor decoration.

[0066] Finally, it should be noted that the above examples are only intended to explain, rather than to limit the technical solutions of the present invention. Although the present invention is described in detail with reference to the examples of the present invention, those of ordinary skill in the art should understand that modifications or equivalent replacements may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and such modifications or equivalent replacements should fall within the protection scope of the present invention.