NZ223105A - Joint for steel frame - Google Patents

Description

No.: Date: F: ( Spcci - - "L . °s. ^y^CMiO :cn r;: '£c>yi?>/ 3^/, ?/*??... ;2 ;NEW ZEALAND ;PATENTS ACT, 1953 ;COMPLETE SPECIFICATION STEELWORK JOINTS ;/-^HANGC I 3AME OF APPLICANT ;TJ h%\\ lU pjc- ;22 3 1 0 5 ;r m!l ;¥~6JMWsJ ;V, „♦?< ;,-JJ ;H/We, BRiTISH-ST-eet-eORPORATfeN, a British company of 9 Albert Embankment, London SE1 7SN, England hereby declare the invention for which X / we pray that a patent may be granted to XWK/us, and the method by which it is to be performed, to be particularly described in and by the following statement: - ;1 - ;This invention relates to steelwork joints and particularly, but not exclusively, relates to support structures. The method and design described offers a number of advantages over conventionally used designs, whether employing single or multiple bolts, in particular it allows for the rapid and safe erection of tunnel support structures, that is, roof beams/support legs. Additionally the construction and flexibility of handling of the joint allows easy erection under a wide range of working conditions. The joint offers good support resistance in the sense that it can readily accommodate a significant degree of geological stress without distortion, displacement and collapse. ;The present invention provides a steelwork joint comprising one component having an upstanding head of definitive section shape from which laterally extends a boss of similarly shaped section and including two shoulder portions extending alongside but displaced from the boss, and another component having a head of like shaped section into which is formed a recess of similarly shaped section and including two shoulder portions displaced from but lying adjacent the orifice of, the recess, apertures being provided axially of the boss in the one component and the back walls of the recess in the other, the disposition and dimensions of the shoulders and the boss and recess being such that, in at least one position of the two components, the boss nests within the recess with the apertures in alignment for reception of a bolt with the shoulders of the one component mating with the walls of the recess and the shoulders of the other component mating with the head of the said one component, the nesting parts and the shoulders together restraining relative movement of the two components in both a twisting mode and a rotational mode about the axis of the apertures. ;223105 ;The shape of the head, the boss and the recess may be rectangular, preferably square, in cross-section. With such square parts two locking positions may be manifested by designing one of the components such that the shoulders and the head are substantially symmetrically disposed whilst with the other the head is "displaced" relatively to the shoulders such that one shoulder is at a different level from the other. ;The components may be cast or forged steel and they may be readily welded to the roof beam or support leg joist as appropri ate. ;In order that the invention may be fully understood one embodiment hereof will now be described, with reference to the accompanying drawings, in which: ;Fig.l is a front elevation of the 'female' component of the joint; ;Fig.2 is a side elevation of Fig.l Fig.3 is in plan view of Fig 1 ;Fig.4 is a front elevation of the 'male' component; Fig.5 is a side elevation of Fig.4 and Fig.6 is a plan view of Fig.4 ;Referring now to Figures 1 to 3 the female component comprises an H-shaped base portion 1 having an upstanding square-section head 2 with two angularly disposed shoulders 3, 4 laterally extending adjacent to two lower sides of the head. ;A square-section recess 5 is formed in the head and a through hole 6 is aligned symmetrically with this recess. The recess is tapered to facilitate reception of the male component to ;22 3 1 05 ;tilted by 5° from the perpendicular diametrical plane as viewed in Figure 1. ;The male component shown in Figs 4 to 6 likewise comprises an H-shaped base portion (7) having an upstanding square-section head 8 with two asymmetrical angularly disposed shoulders 9,10. A square section boss 12 protrudes from the front face of the head 8 and this is tapered to ease entry into the recess 5. The shoulders 9,10 extend alongside the boss and are each spaced from it by an amount equal to the width of the wall of the head 2 defined by the recess 5. ;Again the square form of the boss and head is tilted by 5° from the perpendicular diametrical plane as viewed in Figure 4. ;A through hole 13 is aligned symmetrically with the head/boss and the head is recessed at 14 to accommodate the crown of a bolt (not shown) ;The joint components themselves therefore, fit together in just two positions, one defining an included angle of 80° between the base. portions 1 and 7 and the other defining an angle of 170°. In practice, in colliery roadways for which this joint is primarily designed the male (or female) component would be welded along its base to the butt end of the (upright) joist whereas the other component, female or male, respectively, would either be welded to the butt end of the roof beam or to the underside of same immediately adjacent to its end. Thus, depending on the disposition of the fit there will in each case be a 100° angle between the beam and joist i.e. a 'splay' angle of 10°. Of course if the ends of the joist and beam themselves are angled instead of normal to the length of these items then a multiplicity of splay angles may be readily selected. ;- 4 - ;In accordance with this invention therefore, there is provided a single bolt joint permitting speedy ease of erection and exhibiting immense strength and resistance to forces causing twisting and rotational motion of the beam/joists. ;A further feature which may conveniently be added is the provision of lugs 15, 16 on the outer sides of the heads 2 and 8 in both of the joint components; these are shown in Figs 1 and 4 only, for clarity. These lugs on the one component abut the shoulders on the other component in the two positions of the joint and provide a visible indication of impending joint failure in the sense that the lugs themselves are first fractured or severely distorted. ;Additionally, although this "square-lock" joint has been described with reference to the specific embodiment illustrated it is to be understood that many modifications may be made without departing from the scope of this invention. For example, the mating boss and recess may not be square in cross section, it could be rectangular or indeed any shape or form which permits nesting in the manner described whilst inhibiting rotational movement or articulation. ;The invention is not restricted furthermore to use in colliery roadways, it could readily be used in any structural steelwork where fabrication of this type is employed. *

Claims (8)

WHAT WE CLAIM IS:

1. A steelwork joint comprising one component having an upstanding head of definitive section shape from which laterally extends a boss of similarly shaped section and including two shoulder portions extending alongside but displaced from the boss, and another component having a head of like shaped section into which is formed a recess of similarly shaped section and including two shoulder portions displaced from but lying adjacent the orifice of, the recess, apertures being provided axially of the boss in the one component and the back walls of the recess in the other, the disposition and dimensions of the shoulders and the boss and recess being such that, in at least one position of the two components, the boss nests within the recess with the apertures in alignment for reception of a bolt with the shoulders of the one component mating with the walls of the recess and the shoulders of the other component mating with the head of the said one component, the nesting parts and the shoulders together restraining relative movement of the two components in both a twisting mode and a rotational mode about the axis of the apertures.

2. A joint according to Claim 1, in which the section shape of the head, the boss and the recess is rectangular.

3. A joint according to Claim 2, in which the rectangular » shape is square.

A joint according to any one of Claims 1 to 3 in which lugs project from the head of each component and are so placed that when the joint is formed with the said parts nesting the lugs on the one and other of components ab^ut the shoulders of the said other and said one components, respectively. 6 / " 6 " /.'V £ 22 3 1 0 5

5. A joint according to any one of Claims 1 to 4, in which the components are made from cast or forged steel.

A joint according to any one of Claims 1 to 5, in which one component is welded to a beam and the other is welded to a joist.

7,. A joint according to Claim 6, employed in an underground roadway.

8. A steelwork joint, substantially as herein described with reference to the accompanying drawings. io*1 By HiZfthe'ir authorised Agents., A. J. PARK & SON. Psr OCWL» - 7 -