Static structures (e.g. – buildings) – Assembled in situ-type anchor or tie – Socket type
Patent
1981-01-16
1983-06-28
Bell, J. Karl
Static structures (e.g., buildings)
Assembled in situ-type anchor or tie
Socket type
52712, 52379, E04B 140
Patent
active
043898300
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an anchorage for attachment of ties to walls, floors and ceilings of various kinds, comprising a generally tubular section having a longitudinal slot for introduction of one end of the tie. The invention also relates to a tie to be used together with said anchorage, which tie is generally formed of steel wire and has an intermediate, straight stem portion which at one end has a generally circular portion with a diameter substantially equal to the internal diameter of the section, and which at the other end has a transverse portion.
Previously known masonry anchorages of this type necessarily had to be cast relatively deep into the concrete in order for the tie not to be pulled out of the concrete at a certain tensile force. In order to gain access to the cavity of the anchorage section after the casting, it has been usual to place a wooden wedge in the slot of the section and let it extend out to the outside of the concrete. This wedge must later be removed before the tie can be placed in the anchorage. Positioning and removal of the wedge is time consuming and, furthermore, has the disadvantage that only that portion of the anchorage in which the wedge is placed can be used for introduction of ties.
It is previously known a tie of the type mentioned above, consisting of a straight piece of steel wire which in one end has welded to it a round washer and in the other end has welded to it a relatively short transverse pin. When placing the tie in the anchorage, the end of the tie having the washer is introduced through the slot of the anchorage, whereupon the tie is turned about 90.degree. so that the washer is positioned transversally in the anchorage and can no longer be pulled out. One disadvantage of such ties is that when they are used to anchor a facing to a concrete wall, the grip of the ties in the anchorage can easily loosen when the facing, for instance due to different temperature expansion, moves with respect to the concrete wall. Another drawback is that it is not allowed to use such ties above a certain tensile load due to their welded construction.
A further drawback is that these ties are relatively expensive to manufacture.
An object of the present invention is thus to provide an anchorage of the type first mentioned whose attachment in the concrete is so strong that its slot may be placed flush with the outside of the concrete in order to give simpler installation and avoid the use of wooden wedges in the concrete. Another object is to provide a tie which has a more secure grip in the anchorage and which may not be twisted out of position. A further object of the invention is to provide an anchorage/tie combination which permits relative movement between the facing and concrete wall without losing its strength.
These objects are obtained according to the invention with an anchorage of the type first mentioned which is characterized in that the section, at the opposite side of the longitudinal slot, is provided with external attachment flanges. The tie according to the invention is characterized in that its generally circular portion is constituted by a loop of the steel wire, and that the free end of the steel wire at the loop is bent transversally of the plane of the loop and extends some distance out from the loop.
Further advantageous features of the invention will appear from the dependent claims and from the following description of the examplifying embodiments of the invention which are shown in the accompanying drawing.
FIG. 1 illustrates a section through a concrete structure with an anchorage according to the invention embedded therein.
FIG. 2 shows a section transversally of the section shown in FIG. 1.
FIG. 3 shows a tie according to the invention in side view.
FIG. 4 shows the tie of FIG. 3 as viewed towards the left.
FIG. 5 is a view like FIG. 3 and shows a modification of the tie.
FIG. 6 shows the tie of FIG. 5 as viewed towards the left.
FIG. 7 shows a plan view of a safeguarding plate for a tie according to FIGS. 3 and 4.
FIG. 8 shows the saf
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