RU2329359C1 - Bolted junction of thin-walled elements - Google Patents

Abstract

FIELD: building.

SUBSTANCE: bolted junction of thin-walled elements includes the upper and lower joining elements. The elements are overlapped on a gusset plate and tied between each other by means of a driftpin supplied with screws and plane washers. The screw is installed in coaxial apertures. Between jointed elements, rings with one-sided cone external surface are placed. Cone external surface is oriented toward thin-walled elements. The aperture in the gusset plate has a double-side reamer. The rings are disposed between the upper and lower elements and plain washers.

EFFECT: improved bearing ability of bolted junction.

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Description

The invention relates to the field of construction and is intended for connecting thin-walled elements in load-bearing structures.

Known bolted connection of thin-walled elements in lattice structures, including sheet gussets with overlapped ends of thin-walled elements made of galvanized steel. The elements are connected by bolts of normal accuracy inserted into coaxial holes [see book Klyachin A.Z. Metal lattice spatial structures of regular structure. Yekaterinburg, 1994, p.17-19].

The disadvantage of the connection is the low bearing capacity for crushing due to the fact that thin-walled elements are used.

Another connection of thin-walled elements is known, including lapped ends tightened by a bolt with washers inserted in coaxial holes. In this case, a conical depression and thickening are formed on the surface of the washer. When tightening the bolt, thin-walled elements around the perimeter of the bolt are pinched between the washers, which leads to an increase in the bearing capacity of the joint for crushing [RF Patent No. 2264507 of 04/09/2004, IPC EV0458. Bulletin No. 32 of November 20, 2005].

The disadvantage of the connection is the impossibility of connecting thin-walled elements in the presence of sheet nodular gussets of greater thickness, for example 5 ÷ 8 mm.

Closest to the invention is a bolt connection, including the upper and lower elements, lapped onto the gusset and tightened by a bolt with washers and a nut inserted into the coaxial holes in the connected elements. Moreover, between the gusset, the upper and lower elements, rings with a bilateral conical outer surface are installed [Aut. testimonial. No. 536335 dated July 4, 75, μl F16B 5/02. Bulletin No. 43 of 11.25.76].

The disadvantage of the connection is the inability to complete the connection in the case of using thin-walled upper and lower elements.

The invention is aimed at increasing the bearing capacity of the bolted connection of thin-walled elements attached to the nodal gusset.

The achievement of this result is ensured by the fact that in a bolted connection, including the upper and lower elements lapped onto the gusset and pulled together by a through bolt with a nut and washers inserted in a coaxial hole, while rings with a conical outer surface are installed between the connected elements, according to the invention , the hole in the gusset is made with a two-sided countersink, and the rings are located between the upper and lower thin-walled elements and washers, while the rings are made with a one-sided conical surface surface oriented towards thin-walled elements.

Figure 1 shows a lattice frame with bolted nodal joints on the gussets; figure 2 shows a General view of the bolt connection of thin-walled elements on the example of a lattice frame, node 1 in figure 1; figure 3 shows a section of a bolted connection during the assembly process (section 1-1 in figure 2); figure 4 shows a section of the node in the assembled state (section 1-1 in figure 2).

The bolted connection of thin-walled elements includes upper and lower elements 1, for example, of bent profiles, overlapped on the profile 2. In the profile 2 with a thickness of 5 ÷ 10 mm, a hole with a two-sided countersink is made. The connection of the elements 1 and 2 is performed through a bolt 3 with a nut 4 and washers 5, inserted into the coaxial hole. Between the thin-walled elements 1 and the washers 5, rings 6 are installed with a one-sided conical surface oriented towards the thin-walled elements 1.

The assembly of the bolted connection is carried out in the following sequence.

Thin-walled profile elements 1, in which coaxial holes are made, are laid on the gusset with overlap. A bolt 3 is installed in the coaxial holes, onto which rings 6 with a one-sided conical surface oriented in the direction of thin-walled elements 1, washers 5 and nut 4 are sequentially installed.

When tightening the nut 4, the rings 6 with a tapered surface are pressed along the perimeter of the hole into the thin-walled elements 1, deforming them in the form of a countersink hole in the gusset 2. The final tightening of the bolt 3 and the bending of the thin-walled elements 1 formed along the perimeter of the countersink hole in the gusset 2 increase the bearing capacity connection to collapse.

The bolted connection allows you to connect thin-walled elements to gussets of significant thickness with an increase in bearing capacity by 2 ÷ 2.5 times.

Claims (1)

Bolted connection of thin-walled elements, including upper and lower connected elements, lapped onto the gusset and pulled together by a through bolt with a nut and washers inserted in coaxial holes, while rings with a tapered outer surface are installed between the connected elements, characterized in that the hole in the gusset made with a two-sided countersink, and the rings are located between the upper and lower thin-walled elements and washers, while the rings are made with a one-sided conical surface, oriented No towards thin-walled elements.

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