JPH029135B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to, for example, foamed concrete (hereinafter simply referred to as
Anchors used in soft and porous materials such as ALC (sometimes referred to as ALC).

[Conventional technology]

Conventionally, the same type of anchor has been made by sandwiching and tightly fitting a band-shaped metal plate between a pair of legs, and forming a symmetrical tapered surface at the tip of the joint surface of both legs, as shown in Japanese Utility Model Publication No. 19449/1983. Was.

[Problem that the invention seeks to solve]

When the above-mentioned anchor is driven into a soft material, the pair of legs of the anchor expand, and the soft material forms a widening hole a as shown in FIG. 9 or 10. However, during driving, the vicinity of the opening b of the driving hole of the anchor is fractured, and the resistance force when a pull-out force is applied becomes small. In addition, the member for keeping the legs in an expanded state when a pullout force is applied is a small band-like metal plate and is weak, so that the pullout resistance of the anchor is further reduced.

The present invention solves these conventional problems, and
It is an object of the present invention to provide an anchor that has a high pull-out resistance against a material.

[Means for solving problems]

The present invention provides an anchor consisting of a pair of legs that are connected at the head and have tapered inclined surfaces formed on opposite sides of the tips, and that is slidably fitted around the outer periphery of the pair of legs. An outer annular portion is provided, and an intervening portion that is interposed between the legs and has a wedge at its tip is formed integrally with the outer annular portion, and further, the length of the intervening portion is set to be the same as the length of the legs. Set to 20-70% of the dimensions.

[Effect]

When the anchor configured as described above is driven into a soft and porous material such as foamed concrete, the wedge body will cut between the opposing surfaces of the legs, and only the tip of the legs will expand. , the expanded portion is no longer narrowed by the wedge body. Further, the legs extending from the head to a length that is approximately the same as the length of the intervening portion are driven into the ALC without being expanded, and are expanded significantly for the first time inside the ALC.

〔Example〕

Hereinafter, the present invention will be explained in detail based on drawings shown in examples.

In FIGS. 2 and 3, reference numeral 1 denotes an anchor, which is composed of an anchor body 2 and a sliding member 3. The anchor body 2 has a pair of legs 4, 4 having a fan-shaped cross section as shown in FIG. 4, which are opposed to each other on their string sides, and are integrally connected at a head 5.
Furthermore, opposing surfaces 6, 6 at the tips of the pair of legs 4, 4
Tapered inclined surfaces 7, 7 are formed on the sides. Reference numerals 8 and 8 are connection pieces that connect the legs 4, 4, and as shown in FIG. 5, only a portion of the opposing surfaces 6, 6 of the legs 4, 4 are connected. Then, when driving, the interposed part 1
The pieces are sequentially cut at the notch portions 12 of 1.

As shown in FIGS. 1 and 6, the sliding member 3 includes an outer ring portion 9 that is slidably fitted around the outer periphery of the pair of legs 4, 4, and an outer ring portion 9 that is fitted between the legs 4, 4. and an interposed part 11 having a wedge body 10 at its tip. The outer ring portion 9 is made of a ring body,
Further, the intervening part 11 is formed in a cross-sectional shape as shown in FIG. 4 so that it can be interposed between the legs 4, 4. Further, the wedge body 10 has legs 4, 4.
The intervening portion 11 is arranged so as to fit into the inclined surfaces 7, 7 of the
The tip is thick when viewed from the front and tapered when viewed from the side. The proximal end of the intervening portion 11 is integrally connected to the outer annular portion 9, and the intervening portion 11 is disposed at a diametrical position of the outer annular portion 9 when viewed from above. Further, in the illustrated example, the length l of the intervening portion 11 is set to approximately half the length L of the leg 4 of the anchor body 2. Reference numeral 12 denotes a notch provided on the proximal end surface of the intervening portion 11 .

Next, FIG. 7 shows a state in which the anchor 1 constructed as described above is driven into a soft material 13 such as foamed concrete with a hammer (not shown). 14 is an attached part. From the state shown in FIG. 7 to the state shown in FIG. 7, that is, the state in which the outer ring part 9 of the sliding member 3 is in contact with the attached part 14, the legs 4, 4 are tightened to the outer ring part 9, and Slope 7, 7
is fitted with the wedge body 10 of the interposed part 11, so
The legs 4, 4 are immediately driven into the soft material 13 without the tips of the legs 4, 4 expanding. That is, the hole 16 between the length dimension A from the surface 15 of the soft material 13 to the tips of the legs 4, 4 has the minimum hole diameter B.
becomes.

Further, as the anchor 1 continues to be driven in, the outer ring part 9 of the sliding member 3 remains in that position while contacting the attached part 14, and only the legs 4, 4 are driven in. Therefore, the wedge body 10 of the interposed part 11 of the sliding member 3 is forced to
As shown in FIG. 7, only the tips of the legs 4, 4 are expanded. That is, as described above, between the length dimension C excluding the wedge body 10 from the length dimension A, the hole diameter B of the soft material 13 is the minimum, and the legs 4, 4 are located deeper than that.
expands greatly.

That is, the hole 16 formed by the anchor 1 of the soft material 13 has an inverted Y shape as shown in FIG.
In other words, the soft material 13 around the hole 16 between the length dimension B is not crushed. Further, due to the wedge body 10, when an attempt is made to pull out the main anchor, the expanded portions of the legs 4, 4 do not narrow, and a strong pulling resistance force is generated.

Further, according to the above embodiment, the pair of legs 4,
4 are connected by the connecting pieces 8, 8, so that the anchor 1 is prevented from being seated when the anchor 1 is driven in, and the hole 16 in the soft material 13 is prevented from expanding. Furthermore, while forming the cross section of the legs 4, 4 into a fan shape,
Since the cross section of the intervening part 11 of the sliding member 3 is formed into a square shape so as to fit into the legs 4, 4, the intervening part 11 of the sliding member 3 does not escape from between the legs 4, 4. It is always interposed between the legs 4, 4.

Note that it is also preferable that the intervening part 11 connecting the wedge body 10 of the sliding member 3 and the outer ring part 9 be made of wire or plastic wire.

Note that the length l of the intervening portion 11 is
It is possible to increase or decrease the length within the range of 20 to 70%, but if l is shorter than 20% of L, the shape approximates the hole shown in Figure 9 - that is, the anchor drive. Immediately after insertion, the legs 4, 4 take on a widened shape, and the opening end of the hole is notched when a pulling force is applied, reducing the pulling resistance, which is undesirable. On the other hand, if l exceeds 70% of L and the intervening part 11 is long, the tips of the legs 4, 4 will expand only slightly inside the soft material, so the pull-out resistance will decrease. So, I don't like it. Therefore, by setting l=0.20L to l=0.70L, the pulling resistance force can be sufficiently increased compared to the conventional one. In particular, l
It has been found that the maximum pulling resistance can be obtained in the vicinity of =0.30L to l=0.60L.

〔Effect of the invention〕

When the anchor of the present invention is driven into a soft material such as ALC, the wedge body cuts between the opposing surfaces of the leg body,
Only the distal ends of the legs are expanded, and the expanded portions are no longer narrowed by the wedge bodies, exerting a pulling resistance force. Further, the legs from the head to a length approximately equal to the length of the intervening portion do not expand. Therefore, the hole formed by the anchor from the surface of the material to approximately the same length as the length of the intervening part can be sufficiently long and have a minimum hole diameter, and furthermore, the hole in the periphery of the hole can be made sufficiently long and have a minimum diameter. Since the material is not crushed, the legs 4, 4 are pressed in the direction of the inner diameter as indicated by arrow D in FIG. 8 to withstand the pull-out force and further increase the resistance force.

[Brief explanation of drawings]

Fig. 1 is a perspective view of an outer ring part and an intervening part showing an embodiment of the present invention, Fig. 2 is a front view of the whole, Fig. 3 is a side view, and Fig. 4 is taken along the line X-X in Fig. 2. cross section,
5 is a sectional view taken along the line Y-Y in FIG. 2, FIG. 6 is a side view of FIG. FIG. 3 is a cross-sectional view showing the state of a hole formed by the anchor. FIGS. 9 and 10 are cross-sectional views showing the state of holes formed by conventional anchors. 4... Legs, 5... Head, 6... Opposing surface, 7...
... Tapered inclined surface, 9 ... Outer ring part, 10 ... Cuneiform body, 1
1...Intervening part, l...Length dimension, L...Length dimension.

Claims (1)

[Scope of Claims] 1. An anchor consisting of a pair of legs 4, 4 connected at a head 5 and having tapered inclined surfaces 7, 7 formed on opposing surfaces 6, 6 at the tips, An outer ring part 9 is provided that is slidably fitted around the outer periphery of the legs 4, 4, and an intervening part 11 that is interposed between the legs 4, 4 and has a wedge body 10 at its tip is provided in the outer ring part. 9, and further, the length l of the interposed part 11 is set to the length l of the legs 4, 4.
The anchor is characterized by being set at 20 to 70%.