FR2706514A1 - Device for joining girders together - Google Patents

Abstract

In order to join together two superimposed orthogonal girders, preferably I girders or T girders, the device includes two clips made of strips of spring steel arranged on either side of the upper girder. The clips include hooks which grip the two lower flanges of the upper girder, elastic heels and tongues equipped with studs which grip the upper flanges of the lower girder. The clips can be fitted very quickly by clipping the studs under the flanges of the lower girder. The device can also be used with back-to-back U-shaped girders with or without the interposition of a core made of wood, ply, or any other substitute material. It is equally suitable for metal girders (steel, aluminium, etc.) and for wooden beams or compound girders (metal + wood or substitute material). This device is particularly beneficial where the temporary joining together of girders in superimposed beds is concerned, as is the case in civil engineering and building work, for forming formwork (shuttering).

Description

-1- We often need to assemble joists, in civil engineering or

  Generally, the two beams to be joined are placed one on top of the other and perpendicular to each other. This is the case, for example, in formwork tables or traditional slab formwork or formwork: there is a first bed beams (beams or stiffeners) and a second bed

  beams on which the formwork skin is supported.

  We knew different ways of joining together two

  orthogonal beams: Generally the beams are profi-

  I-strips (metal beams or wooden beams or mixed beams (metal + wood or replacement material). We can, for example, assemble them using toads held by stirrups or bolt them together drilling holes in the wings (which is not always possible) or drilling holes in

  the wings of a single beam to pass bolts now-

  These solutions are slow to implement and expensive, and drill holes in the wings of the toads.

  joists is a deterioration that hinders their reuse.

  The present invention avoids these drawbacks.

  It allows to assemble two beams having wings, even of small dimensions, without drilling holes and without having nuts to

  It is also an economical and quick solution.

  Figure 1 is an elevational view of two I-beams

  orthogonal, assembled using the device object of the invention.

  Figure 2 is a longitudinal section on a larger scale of

these measures.

  Figure 3 is a cross section of the device.

  Figure 4 is another cross section of the device.

  Figure 5 is a longitudinal section of a clip whose -2- shape prevents its accidental sliding

  Figure 6 is another form of clip to prevent slipping.

accidentally.

  We see in Figure i the two beams 1 and 2 which are assembled by two clips 3 located on either side of the beam 1. Each clip has one or more hooks 4 which

  surround the wings 5 of the beam 1.Each clip includes

  also carries a heel 6 which envelops the wing 7 of the beam 2.

  Opposite the heel 6, each clip has a tongue 8 provided with a lug 9 which is elastic, comes to be housed under the wing 7 of the beam 2. The clip is made of a material with a high limit

  elastic, such as, for example, a hardened spring steel strip.

  The installation of the device is done as follows: The two beams 1 and 2 having been placed in their position

  final, we put in place a first clip 3 against the beam-

  1 by sliding its heel 6 under the wing 7 of the beam 2.Then we rotate it around its heel 6 by pressing it down

  with sufficient effort so that its lug 9 engages by elastic-

  cited under wing 7 of the beam 2. Hooks 4 wrap around

  then perfectly the wing 5 of the beam 1.

  We proceed in the same way with a second clip to fix the other lower wing of the beam I. This latter is then trapped between the two clips which firmly hold its two lower wings. To disassemble the assembly proceed in the opposite way: We lift the tongue 8 by hand or using a screwdriver or any other lever to make the pin 9 escape, which releases

clip 3.

  In order for lug 9 to have sufficient strength, it is desirable to

  table that it is not a simple cut and folded tongue, but a "punctured" obtained by cutting-stamping so that the -3- c8tés 11 of the lug 9 remain attached to the tongue 8, only the upper part of the "punctured "being open. A cylindrical" punctured ",

  as shown in Figure 4 provides this result.

  The beams have manufacturing tolerances, so that from one beam to another there may be small differences in wing thickness, and from one clip to another there may be small differences in dimensions, so we will have to plan the manufacturing so that all staples can be

  climb on the beams with the thickest wings.

  But then in the case of the thinnest wings, there will be a clearance, hence a risk of slipping of the staples which can lead the wings to escape from the hooks. To avoid this risk, it will be good to give the staple a shape such that, by elasticity, it always remains in energetic contact with the two beams. We could for example give them the shape shown in FIG. 5: The heel 6 has a return 10 which rests under the wing 7 of the beam 2.0 or else again, as shown in FIG. 6.1 on the back of the clip comprises, inside, a transverse boss (which may be a rib obtained by stamping) 12 located a few millimeters from the return 10 towards the tongue so as to constitute a lever of the first kind which by elasticity, applies

  energetically the return 10 under the wing 7 of the beam 2.

  The sliding of the staple is thus made impossible.

  Of course on the same clip, we can combine the two solutions

  and have both a heel return and a boss, as shown

felt in figure 6.

  This kind of device can be used for all

  trelles which respectively have two lower wings (for beams 1) and two upper wings (for beams 2) .I1 suitable for steel, wooden, aluminum etc ... or mixed beams (metal + wood or material of -4 - replacement) .It is also suitable for U profiles back-to-back, with or without the interposition of a wooden core or a replacement material (plywood, chipboard, etc.) -5-

RE VE ND I C AT I 0 NS

  1) Device for assembling two superimposed orthogonal beams, characterized in that it is constituted by two elastic staples, each staple comprising on the one hand one or more hooks which enclose a lower wing of the upper beam and on the other hand, a heel which engages under the upper wing of the lower beam and, on the other hand, a tongue provided with one or more lugs which, by elasticity, engage under the other upper wing of

the lower beam.

  2) Device according to claim 1 characterized in that the lug (or lugs) is a "punctured" of the cylindrical type

  of which only the upper side is open.

  3) Device according to claim 1 or 2 characterized by the

  causes the heel of each clip to have a return.

  4) Device according to claims 1 or 2 or 3 characterized

  by the fact that each clip has, inside its dorsal part, a boss (which can be produced by stamping a transverse rib) located between the fulcrum of the

  heel (or back) and tongue.

  5) Device according to claim 4 characterized in that the clip comprises both a heel and a transverse boss (which can optionally be obtained by stamping

a transverse groove).