DE9000919U1 - Wall anchor - Google Patents

Description

Claw anchor.

The invention relates to a masonry anchor for the tensile connection of a wall made of masonry with another masonry wall butt-joining it, consisting of an elongated, essentially rectangular strip of masonry which is inserted into a bed joint of the masonry and which has several rows of holes extending in its longitudinal direction and parallel to one another and arranged at equal distances (equal pitch), the holes in one row being offset by half a pitch above the holes in the adjacent row.

The traditional design of masonry, in which the walls were bonded together, was necessary in earlier times because the ceilings could not usually be used for bracing. In conventional masonry, the walls to be braced had to be raised at the same time as the walls to be braced and built in a bond. However, raising the walls converging in a wall corner or a wall cross at the same time hinders the construction process.

U The massive ceilings that are often used today, which act as a slab, result in more favourable conditions for the structural reinforcement and the associated horizontal load transfer. The so-called butt joint construction method was developed, in which the load-bearing wall to be reinforced can be raised independently of the stiffening transverse wall. The transverse wall to be built later is brought up against the load-bearing wall in a butt joint. In order to achieve a tensile connection between the load-bearing wall and the transverse wall, when building the load-bearing wall, in the area in which the transverse wall will later be connected to the

load-bearing wall, wall anchors of the generic type are inserted into the bearing joints after previously '% Mortar was applied to the bed joint. Only

H - relatively few wall anchors required, which in

;<.: 5 mutual height distance of about one third of the

.J* storey height. The power transmission

'§_ &zgr;-fishing the respective Msuwr,:^ jker and the masonry

% essentially follows from the fact that the still plastic

'si mortar penetrates into the holes of the wall anchor, so that

-.·$ 10 after the mortar has hardened, the parts of it that have penetrated into the holes form a kind of bolt,

H , λ by which a positive anchoring between the

f wall anchors and d«»m wall anchor.

!'■' 15 In a known wall anchor of the type mentioned above,

which is used to connect sand-lime bricks

..· Maueruerk is provided, a total of three rows of holes are arranged in the sheet metal strip. There is a central row of holes and two lateral rows 20 of holes, whereby the centres of the lateral rows of holes are on the long edges of the sheet metal strip, so that on the two long edges of the sheet metal strip

'&lgr; There are semicircular holes in each case. The opposite

p sided distance, also called pitch, of the holes in each

■i ') 25 row, is 33 mm and the hole diameter is 7 mm. It has now been found that these known wall anchors have too low a breaking load when they are used in combination with aerated concrete blocks in whose bed joints thin-bed mortar with a thickness of about 1 - 3 mm 30 is applied. The average breaking loads were only about 2.3 kW for a clamping length of 15 cm. The breaking load is understood to be the load at which the wall anchor is pulled out of the masonry. The breaking load is determined by pull-out tests. Taking into account

' 35 a minimum threefold security compared to the average

The breaking load for the well-known wall anchor

too small a permissible anchor eel.

The invention is therefore based on the object of creating a wall anchor for the tensile connection of a wall made of masonry with another masonry wall of the type mentioned at the beginning that is butt-jointed to it, which, when used in aerated concrete masonry and thin-bed mortar, has a breaking load that is significantly higher than that of the known wall anchor and is sufficient for the butt-joint construction.

This is achieved according to the invention in that the holes are arranged in at least five mutually parallel rows, that the hole diameter is approximately UG mm and that the pitch is equal to or smaller than four times the hole diameter.

It was surprisingly found that despite the reduction in hole diameter and the simultaneous increase in the number of holes, a significant increase in the breaking load can be achieved, especially when using the new wall anchor in aerated concrete masonry that is built with thin-bed mortar. In numerous pull-out tests, average breaking loads of over 7 kN were found with a wall anchor clamping length of 15 cm. These breaking loads are completely sufficient for the use of the wall anchor in aerated concrete masonry for the butt joint construction method.

Advantageous embodiments of the invention are characterized in the subclaims.

The invention is explained in more detail below using an embodiment shown in the drawing.

-U-

Cs show:

Figure 1 is a plan view of a wall anchor according to the invention ,

Figure 2 shows a horizontal cross-section along the bed joint in a butt-joint masonry wall made of aerated concrete along the line II-II of Figure 3,

Figure 3 shows a vertical section through such masonry along the line HI-III of Figure 2.

In the drawing, 1 designates the entire wall anchor, which consists of an elongated, essentially rectangular sheet metal strip 2. Stainless steel sheet is used as the sheet metal. The thickness of the sheet metal strip is approximately 0.8 mm, the width preferably 3D mm and its length L with a clamping length of 15 cm approximately 300 mm. The sheet metal strip 2 has several rows of holes 3 parallel to one another. Preferably, a total of seven rows R1 - R7 are provided, the centers of the holes 3' of the two outer rows R1 and R7 coinciding with the long edges of the sheet metal, so that the holes ³¹ are open towards the sides of the sheet metal strip 2 and have semicircular openings. The LOUDSPEAKER d Bullte:

between about k - 6 mm and is preferably about 5 mm. The mutual distance and the pitch of the holes in each row should be equal to or smaller than four times the hole diameter d. With a hole diameter d of 5 mm, the pitch t is preferably about 20 mm. It can also be seen from Figure 1 that the holes in one row are offset by half the pitch t/2 from the holes in the adjacent row.

The mutual distance a between rows R1 - R7 should be equal to or smaller than the hole diameter. With a hole diameter d of 5 mm, the mutual distance a is preferably also about 5 mm.

t · t · ■

As can be further seen from Figure 1, the smelling strip 2 has several elongated holes k arranged next to each other in its middle and the lateral semicircular recesses 5 are also somewhat larger in diameter d1 than the hole diameters d of the other holes 3, 3'. In this way, the wall anchor 1 has a weakened cross-section in its middle over a larger length range, which is however sufficient to ensure that no breakage occurs in the middle.

IU the different design of the lateral surfaces in the middle area can be done by the sheet metal strip 2 in the middle area

O can be bent more easily, which may be necessary due to slight height tolerances when building the transverse wall.

15

The use of the wall anchor 1 according to the invention when erecting masonry using a butt joint construction method will now be explained with reference to Figures 2 and 3. In these figures, a load-bearing wall is designated by 6. Such a load-bearing wall 6 is built up on a previously completed floor slab 7 by stacking aerated concrete blocks β on top of one another . In this case, the first wall anchor 1 is inserted into the bed joint at a distance of approximately five thirds of the floor height after thin-bed mortar has been applied to the top of the previously erected layer in a layer thickness of 1-3 mm. An aerated concrete block of the next layer can then be placed immediately on the inserted wall anchor 1, whereby it is not necessary to apply thin-bed mortar to the top of the wall anchor. As soon as the wall anchor is placed, some of the plastic thin-bed mortar penetrates into its holes 3. This penetration is further increased by the pressure of the next aerated concrete block placed on the wall anchor. After the thin-bed mortar has hardened, the parts of the thin-bed mortar that have penetrated into the holes 3 form

■ ■Ill «t '·· · · ·'

bed mortar creates a positive connection between the wall anchor 1 and the aerated concrete block below or above it, as the thin-fill mortar also bonds with these aerated concrete blocks. The wall anchor 1 is inserted into the supporting wall 6 so that it protrudes about halfway out of the wall. After laying more aerated concrete blocks ^, another wall anchor is inserted after another third of the storey height in the manner described. If necessary , the height adjustments can also be made.

1G positions of the wall anchors can be changed and if necessary up to three wall anchors can be arranged next to each other in the same bed joint. At a later point in time the stiffening cross wall 9 can then be built up. The aerated concrete blocks θ of the cross wall 9 are mortared butt-jointed to the previously erected load-bearing wall 6. The protruding halves of the wall anchors 1 also engage in the bed joints of the cross wall 9, whereby thin-bed mortar is also introduced into these bed joints. This thin-bed mortar then penetrates into the holes 3 in the manner described and, after it has hardened, ensures a positive connection. In the event of any differences in height between the bed joints of the load-bearing wall 6 and the cross wall 9, the halves of the wall anchors protruding from the load-bearing wall can be bent upwards or downwards.

Claims (3)

&mdash; 7 &mdash; Protection claims 1. Wall anchor for the tensile connection of a wall made of masonry with another masonry wall that is butt-jointed to it, consisting of an elongated, essentially rectangular sheet metal strip that can be inserted into the bed joint of the masonry and which has several in its longitudinal direction extending parallel to each other rowπ of holes arranged at equal mutual distances (equal pitch), the holes in a row being spaced apart by half a pitch from the ζ~ 10 holes of the adjacent row are arranged offset, characterized in that the holes (3, 3 ¹ ) are arranged in at least five mutually parallel rows (R1 - R7), that the hole diameter (d) is approximately U - 6 mm and that the pitch (t) is equal to or smaller than four times the hole diameter (d). 2. Wall anchor according to claim 1, characterized in that the hole diameter (d) is approximately 5 mm. 3. Wall anchor according to claim 1 or 2, characterized in that the mutual distance (a) of the rows (R1 - R7) is equal to or smaller than the hole diameter (d). U. Wall anchor according to claims 1-3, characterized in that the width (B) of the sheet metal strip is about 30 mm, that seven rows (R1 - R7) of holes (3, 3') are provided, that the hole diameter (d) is about 5 mm, that the pitch (t) is about 20 mm and that the mutual distance (a) of the rows (R1 - R7) is about 5 mm. -B- 5- Wall anchor according to at least one of claims 1 - *&diams;, characterized in that the length (L) of the sheet metal strip (2) is approximately 3DO mm. 6· Wall anchor according to at least one of claims 1-5, characterized in that the 81schstreif£■■ (2) has in its center several adjacently arranged i_&f.y-