DE1289366B - Expandable anchorage for use in a drill hole made in concrete, masonry or the like - Google Patents

Description

1 2

The invention relates to an expandable anchoring any drill dust remaining in the borehole for use in a concrete, masonry od a bolt provided with an axial central bore, the end part introduced into the bore hole being expandable when the solid bolt is driven in, 5 hole wall is scraped off. If the drill dust and an expanding mandrel, which also had a conical part in this material receiving space, could be driven into the axial center bore of the, there would no longer be the space required for the bolt and there would be a scraped material at the end facing away from the bolt, and it would have a head part , wherein in the end position of the ver anchoring of the solid bolt anchoring in the borehole does not allow a cavity to be achieved between io in the borehole. Characterized in that after the bolt end, head part and wall of the borehole present invention, the expanding mandrel is formed as a flange for receiving drilling located in the borehole with a material essentially the borehole cross-section. It is an expansion dowel of the above-mentioned type if there is any drill dust in the borehole (German utility model 1 864 882), at 15 it is prevented from entering the space which, as that of the bolt, has a continuous axial means - Has a receiving space for when driving the solid bore. The preceding end of the above-mentioned dowel sleeve material scraped off into the borehole is provided with cutting teeth. The expandable anchorage after seeing. A conical expansion bolt is thus made possible in every case, even if slotted dowel sleeves with cutting teeth or any drill dust remaining in the drill hole are inserted and together with the dowel is a secure anchoring in a sleeve Pre-drilled dowel hole in the masonry around the space to accommodate the driven in during driving. The material scraped off when driving the anchor into the anchoring bolt and scraped off by the cutting edges can be made sufficiently large, according to a further embodiment of the invention, which collects the front face of the anchor sleeve in a conical recess. Subsequent priority of January 28, 1964 is due, the expansion part is that this created receiving space to thorn, as known per se, is small between the head part, which is also formed as a flange, and also material can penetrate into this head part and the conical part When drilling the hole in this cylindrical section of smaller diameter was left behind because the expanding mandrel has a side and that the total length of the expanding mandrel allows passage of this material from the drill larger than the depth of the central bore of the anchor hole base in this space. This has to be the bolt.

Consequence that not the desired absolutely safe It is indeed already an expandable anchorage Seat of the expansion dowel in the borehole can be achieved from US Pat. No. 3107,570. 35, in which the expanding mandrel has a disc

In another known expansion dowel (USA. -Shaped flange as the head part, the transverse

Patent 2 900 863) the bolt consists of a section that corresponds to that of the borehole and in which

Solid bolt with a blind hole as an axial middle between the head part and the conical part, a cylindrical one

drilling. An expanding mandrel section of smaller diameter is formed in this central bore,

can be used, but in the end position of the anchorage 40 is a dowel sleeve in this anchorage

is completely driven into this blind hole. Used for one whose end on the borehole side in the end

the drill hole must match the cylindrical section of the expansion mandrel from the drilling position

Flour can be cleaned and also takes place in the encloses and on the flange serving as the head part

Driving the solid bolt into the borehole abuts. The one between the cylindrical section

scraped material no space where it is, the safe 45 and the cone part formed shoulder is supposed to be

Not influencing anchoring, can accumulate. additional anchoring of the expanding mandrel in the

The object of the invention is to provide an expandable dowel sleeve. It is not thought of

To create anchoring of the type mentioned by the cylindrical design of a section

which makes it possible that a secure fit in the borehole of the expanding mandrel has a space for receiving

is guaranteed and provides that the 5 ° when driving the anchor into the borehole

To create inclusion of when driving the bolt into the scraped material.

The borehole created receiving space is sufficient around the attached expanding mandrel in the attached

and is kept separated from the in-hole state to be fixed on the solid bolt, shows

any remaining drilling dust. a further embodiment of the invention the dem

The invention solves this problem in that 55 bolts facing the end of the expanding mandrel an im

the bolt in a manner known per se as a solid essentially cylindrical section, whose

bolt with a blind hole as an axial central bore diameter slightly larger than the diameter of the

formed and the head part of the expanding mandrel is a central bore.

Flange with a substantially the borehole- Preferably, as is known per se, the expansion-

cross-section corresponding diameter is designed. 6 ° bare end part of the solid bolt with a rear

With expandable anchors provided with a cutting ring and clearing rings, called dowel sleeve, it is possible to drill anything in the The invention is explained below with reference to in Hole remaining drill dust also according to the embodiments shown in the drawing Driving the dowel sleeve into the borehole is described in more detail. In the drawing shows suction through the central central bore 65 F i g. 1 is an exploded side view, to remove. When using what is per se an expandable misaligned according to the invention Solid bolt, on the other hand, is no longer an anchor bolt with its expanding mandrel, but from possible. It is therefore to be ensured that this represents a simplified design,

3 4

F i g. 2 receives a sectional view of a slightly worn impact tool without Modified embodiment of the anchorage and thereby the thread is damaged. It was in the Mandrel according to Fig. 1, which tries this in a hole in drawings, the mushroom-shaped extension a masonry od. The like. Used, showing the end 18 to indicate that a Parts broken away and other parts in elevation show some flattening or deformation when adjusted are driving the anchoring occurs. Since the end of 18

F i g. Fig. 3 is a view in vertical section showing a reduced diameter

an expandable anchoring bolt and mandrel to screw a nut onto the threaded

According to an improved embodiment of the invention bolt part 16 is not impaired, since the thread

shows in elevation with parts, the io not being damaged.

The central shaft or body part 14 is made with the bolt and the mandrel in a drilled hole

find in which a considerable amount of waste the other parts in one piece and is at 20

left after drilling the hole, provided with a ring-shaped knurled strip,

before driving in the anchor bolt, which is a suitable axial distance from the

F i g. 4 one of the F i g. 3 similar view, at wel- 15 lower end of the anchorage 10 is to the

rather, however, the anchoring bolts partially indicate the depth up to which the anchoring is in

Has been drifted, the hole should be used to an optimum

F i g. 5 a f i g. 3 and 4 similar view, the efficiency and holding capacity of the anchoring

however, with the anchoring bolt fully driven in, tion can be achieved.

F i g. 6 is a plan view of the lower end of the FIG. 20. These two features, namely the knurling 20

Fig. 3, 4 and 5 shown anchoring bolt, in a certain axial position along the shaft

Figures 7, 8 and 9 14 similar to Figures 3, 4 and 5 and the end 18 of reduced diameter

Views which, however, are of the latter in this respect also in the case of the embodiments according to FIG. 3

deviates that in this case it is assumed that up to 10 is provided.

the drilled hole has been completely cleaned of debris 35 The expansion part 12 of the anchorage 10 has several

has been, in addition, the anchoring bolt rere downward cutting or clearing rings

has a somewhat modified shape, 22, an undercut ring 24 and an or

F i g. 10 one of the F i g. 9, similar partial view, several axial sections, fully through the which, however, extend a further modified embodiment anchorage and thereby slots 26 form of the invention in the fully driven state 30. As mentioned, the self-drilling has shown anchoring grooves instead of fully continuous

In the case of the in FIG. 1 and 2 illustrated embodiment slots, so that when spreading the self-drilling form of the invention is anchoring the cutting end along these grooves anchoring bolt breaks with its mandrel of simplified. In the case of this expandable anchoring form, which does not have all of the features of the in FIG. 3 35 bolts were found to have smaller sizes only up to 10 anchors shown. Which require a tiny cut through the end, the main difference between the embodiments that diametrical slots along opposite sides of FIG. 1 and 2 and the remaining representations of the cutting part 12 can be obtained. In the end 12 is the design of the expanding mandrel, such as an axial central bore 28 is provided, which results from the following. Otherwise, the 4 ° over the clearing rings 22 and 22 are practically the same in the anchoring shown. Embodiment, beyond the slots 26

In Fig. 1 denotes 10 an expandable stretched one. The entry end of the bore 28 is how

anchor bolts made from an elongated steel member, shown at 30, with a relatively flat one

this is expedient on a screw lathe, with chamfering, preferably at an angle of about

for example from cold-rolled bar material, 45 120 °, countersunk. This creates a space 50 for

is provided. It comprises a lower expansion part 12, the waste received by the undercut

a middle shaft or body part 14 and a ring 24 is formed. Details of the problem

Threaded bolt part 16. The threaded bolt part 16 is intended to be used to pick up the waste in the following

protrude from the concrete or masonry and result.

enables the attachment of an object or a 50. A device is used to spread the end 12. (For the sake of simplicity, the masonry young mandrel 32 is worked into the bore 28 from concrete or stone is subsequently driven as concrete. The mandrel 32 gets through best referred to, without, however, the application to so-called cold impact processes being produced and being is limited.) for example by case hardening or top

In the case of the in FIG. 1 arrangement shown is 55 surface hardening hardened, so that a softer core the bolt part 16 is at the upper end and the remains. The mandrel has a central body part Spreader 12 at the lower end, since it is believed 34, an upper entry end 36 of reduced that the anchor bolt 10 is down in a diameter and straight cylindrical shape as well Soil is to be driven. The anchorage has a flange 38 forming a shoulder. Of the can also be in a ceiling, in a wall or in a 60 diameter of the cylindrical end 36 is such, inclined surface are driven into which there is an interference fit or interference fit in the bore 28 Cases the different parts of course have a different one, so that the manufacturer in his company has the regulation to have. The subsequent use anchor assemble with the mandrel 32 and the with the designation "above", "below" and similar dispatch in the assembled state Word formation is of course to be understood relatively. 65 can. The diameter of the inlet end 36 is approximately

The threaded stud portion 16 is greater than 0.025 or 0.050 mm (0.001 or 0.002 ") at its top

End 18 has a reduced diameter that corresponds to the diameter of the bore 28, so that the lower

One end of the latter punches the entry end 36 with a fixed one for driving the anchorage

Seat. In particular when used in Fig: 2, the hole 42 is

Floors, the mandrel remains in its position, while moderately flat ground 52 is shown, so that suitable

the anchoring can be taken down into the hole that is used for drilling the

so that it did not come out of the anchoring hole - the drill used had a flat end,

falls and so that its axial position with reference to FIG. 5 Of course, this is not always the case. Furthermore, the

Anchoring is maintained until it rests directly on the base 52 at the base 'flange 38

of the hole comes to rest before driving. shown what assumes that the hole before the

When handling the anchor according to the invention, the anchorage was completely cleaned

and mandrel combination are no loose parts too. This can happen with a hole that is in a

handle. io ceiling is driven, and also with one in one

The shouldered flange 38 has a wall or hole driven in the ground, however

about the same diameter as the shaft part 14, it is likely in the latter two cases

and the inside of the hole, so that there is no sloping that a considerable amount of material removed

position or tilt when installing or setting in the hole remains. The flange 38 prevents this

the anchoring can take place. Of course, some material has to be removed when the anchorage is set

There must be a certain amount of play, so that it gets into the space 50 when it is set.

the anchoring is freely moved down into the hole. As mentioned, the space 50 is in very many cases

can be. probably too small to allow movement of the

The tapered portion 34 extends from anchor 10 'on the tapered portion 34 entirely

allow the cylindrical entry portion 36 to the flange 38 in 20 down to the flange shoulder 40,

the way that its lower or foot end 39 so that this in the illustrated embodiment

has a slightly smaller diameter than the flange 38, the anchoring and the dome can be done,

so that a shoulder 40 is obtained. water can be introduced into the hole 42, the

The shoulder 40 can serve as a stop against which a sludge forms from the material removed,

the end of the expansion part 12 comes to rest when «5 so that it does not press against the mandrel 32 and

the entire tapered part 34 in the bore lock this in its position or a full expansion

28 is driven in when spreading the anchorage. prevention.

It has been established through experiments that this is just water, of course, not always easily used under practically ideal conditions. How bar and can not be understood with additions to the ceiling, when the anchor 10 is turned to 30, so that in the improved Ausfühunten over the tapered part 34 is driven approximately forms of the invention more space for Aufwird, the expansion part 12 spreads and begins The ring would have to be removed when setting the anchorage to undercut the pre-drilled hole. The genen material is provided.
from the wall of the hole at the undercut Fig. 3 shows an anchorage 60 which collects in a scraped-off waste above the body 44 made of concrete. The anchorage shoulder 40, whereupon, when the end of the part 60 has a central shaft part 62, a lower 12 approaches the shoulder, this waste is taken up by the annular expansion part 64 and an upper threaded bolt part 66. space 50. The terms "lower", "upper", etc. apply

The existence of a room for the Abge of course only for the relative position, since the contracted, or waste, is a feature of both the anchor 60 in both a wall and a wall Simplified embodiment of the invention used as a ceiling and also in a floor also that described below can be improved. The free end of anchor 60 Embodiment, however, the difference is in is with a portion 68 of reduced diameter the fact that in the anchoring and that designed to accommodate the blows of a single-mandrel of the in F i g. 1 and 2, the type of driving tool shown, for example a hammer, is used Space 50 is proportionally quite small and it is quite and, as in FIG. 4 and 5 is shown during driving It is probable that in many cases the anchorage can become somewhat mushroom-shaped. Amount of the material removed is greater than that of which. Furthermore, a knurled strip 70 is provided, which Space 50 of this proportional size recorded indicates the depth to which the anchorage 60 can be used if the anchorage is to be set up to the flange 5 ° for best results. The completion is driven. Often times the removed anchor has a central bore 72 in the form of a pressed against the shoulder 40 of the flange, leaving the hole drilled from its lower end the mandrel 32 is locked at the bottom of the hole, and is in the illustrated anchorage 60 to at the same time the full spread of the spreading part extends to a height 74, d. H. deeper than the slots 12 is prevented. 55 76, which are cut across the anchorage. As

F i g. 2 shows an embodiment of a configuration in FIG. 6, there are only two such slots.

ankerunglO ', seen from the anchoring 10 after, obtained by a single cut

Fig. 1 differs only insofar as their shaft can be many, although also four slots through two

is shorter. Like F i g. 2 shows the anchorage 10 'is made to be cuts at right angles to each other

60 can be inserted into a pre-drilled hole 42 in the concrete body 44. As can be seen, the slots 76

set and a bracket or machine plate is open over its full extent. As with

46 on the surface 48 by means of an anchoring 10 and 10 'on the thread are clearing rings or

bolt end 16 screwed nut 50 with a teeth 78 and an undercut ring 80 on

Washer 52 attached. As can be seen, the lower end of the anchorage is provided. That

the upper end 18 by driving in the 65 end of the anchorage is countersunk at 82,

anchor bolt 10 'somewhat mushroom-shaped. The mandrel 32 with the recessed space a better guide

has a spread of the spreading end 12 and thus tion for the entry of the dome into the bore

causes an undercut of the hole. 72 forms. At the same time, the front

edge of the undercut ring 80 has a cutting effect resulting removed matewiss Sharpening. The recessed space needs rial is denoted by 106.

not as space for the removed material to In F i g. 5, the tapered section 88 is fully in

to serve. the bore 72 entered, the expansion part 64 is full

The design of the expanding mandrel 84 differs from that which has been expanded and has the hole fully behind

those of the cathedral 32. It has a ratio, and room 95 has even more

moderately short cylindrical entry portion 86, which is filled with removed material 106. The BiI-

Has a press fit in the bore 72, so that the manufacturer manufacure of the hole originated original

Insert the mandrel 84 tightly into the bore. The material carried under the flange 92 is even stronger

and the anchoring with the mandrel united to the io has been compressed as shown at 108.

Shipping can bring. For the user, Aus F i g. 5 shows that the mandrel 84 is not full

Such an arrangement also has a great advantage in entering the lower end of the anchorage, but rather

opportunity. Immediately below the cylindrical protrudes from this by an amount that is through the

Entrance portion 86 is a tapered portion 88, the thickness of the flange 92 and most of the

whose taper can be about 8 °, since fixed 15 length of the cylindrical section 90 is formed,

It was found that this slight taper is the bore 72, as mentioned, longer than the

seems to give best results. The tapered slot 76 and also much longer than the depth,

Section 88 goes into a cylindrical section up to which the dome 84 for an optimal holding

90 over, which is to be driven in at the lower end of the cathedral with fortune. For the easier

a flange 92 ends. As a result of the cylindrical ao production, a certain amount of leeway is provided.

Section 90 is the foot diameter 93 which corresponds to the many conditions of concrete or masonry

Foot diameter 39 in FIG. 1 equals, for one a slightly stronger drive-in without loss

given hole size much smaller than when holding power too.

the taper 88 to the flange 92 continuously The effect of the mandrel 84 when receiving the

were. As a result of this design, an elongated pin end 66 will obviously carry at least one

annular, cylindrical space of considerable little axial movement out of the hole

Size around the cylindrical portion 90 around. When the mandrel and anchoring are stuck

received, which have been wedged together by the latter and the wall, both move,

of the hole is limited and denoted by 95. The being the resulting retroactive effect of the

System of the expansion part 64 on the tapering wall of the hole 30 on the expanded part of the connection

cut 88 results in sufficient friction so that, still between the anchorage and the mandrel

when the anchoring makes over the tapered solider. When the cathedral is in the lower end of the

cut 88, but is not locked in a substantial cutout hole, for example by compacted

measured in addition, is driven in by the ablated material that is on top of the

the undercut and spreading obtained in this way is located 35 flange, the first movement of the

the lower end of the anchorage this firmly in anchorage when tightening the dome from its

is held in her hole. When anchoring on the thread disconnect and pulling up the whole

Part 66 a suitable nut is screwed on, will allow anchoring. With the help of the room 95 can

by the force exerted on the anchorage, this can be avoided, as more than sufficient

which wants to pull it out of its hole, the space for receiving the removed material

Spreading part 64 with great force radially inward and is present. The dimensions of the anchorage

wedged very firmly against the expanding mandrel 84. As the 60 and the mandrel 84 with respect to the diameter

remaining hole a smaller diameter than that of the hole 100 are chosen so that a volume

has spread anchoring, this leads to a very good for the space 95, which is about the

safe intervention. 45 is twice the volume of concrete that passes through

In this case it is assumed that a hole is removed 100 from the undercut ring 80 when it is set in the concrete body 44 with the aid of a drill, the volume of which is the final volume of the space that has been drilled, which has a conical end, so 95. As a result, a full spreading of the Verdass the bottom of the hole is the one shown in FIG. 3 and 5 ensures anchoring and also ensures that it has shape. It is also assumed that a 5 ° of the mandrel is not locked in the bottom of the hole, a considerable part of the amount involved in drilling the hole. 3, 4 and 5, the knurled strip 70 indicates the falling removed material in the hole 100 to the depth to which the anchorage 60 has remained, which is shown at 102. This is intended to be driven off when some removed material is usually powdered and has remained rial in the hole under the flange 92. In loose. In the case of the in FIG. Figure 3 is 55 connection to the strip 70, instructions can be given of the anchorage inserted into the hole and given to bring the flange 92 down to the top of the loose for the user to know how to set the anchorage. The optically ablated material 102 has been pressed. At times depth is obtained when the surface F i g. 4 the user has started, the anchoring is located approximately in the middle of the knurled strip,
drive into the hole to fix it. The 60 In F i g. 7, 8 and 9 it is assumed that the hole removed material at the bottom of the hole is now 120 has been drilled by a drill which has an even more compacted than in Fig. 3 and is at 104 slightly flatter lower end, and further, that denotes. The tapered part 88 of the mandrel has partially entered the hole 72 completely wisely before the anchoring is inserted and has been cleaned at the time.

Downward movement of the anchorage has the rear 65 The in F i g. 7, 8 and 9 anchoring shown

Cutting ring 80 material on the sides of the hole 122 deviates from the anchorage 60 of FIG. 3, 4

100 cut away that fell into room 95 and 5 only in one relationship. When anchoring

and begins to fill it. That at the rear 122 is the hole 124, which the hollow drilling

tion forms and corresponds to the bore 72, drilled to a certain depth, designated 126 , so that the mandrel 84 can not enter the anchorage further than to the depth required for optimal retention. The cylindrical entry portion 86 of the dome 84 therefore comes to the bottom of the bore 124 when the anchorage is fully inserted.

Otherwise, the anchorage 122 of the anchorage 60 is identical and is the mandrel 84 in the embodiment according to FIG. 7, 8 and 9 are identical to the mandrel 84 according to FIGS. 3, 4 and 5.

Fig. 10 shows a modified embodiment of a dome 130 in which the cylindrical section 132 is proportionally longer than the section 90 in Figs. 3, 4 and 5, 7, 8 and 9, while the tapered section 88 is shorter.

When the dome 130 is used , it enters the bore 134 when the anchoring is set, spreads the expansion part 64, which undercuts the hole 136 and is in friction contact with approximately over half of the cylindrical section 132. Such an embodiment is likely to be more effective with extremely hard masonry, since in most cases the effectiveness of an anchoring of this type can be reduced by reducing the likelihood of locking the dome 130 in the hole 136 by compressing the removed material in the small available space Space exists.

Claims (4)

Patent claims: 1. Expandable anchorage for use in a drilled hole made in concrete, masonry or the like, consisting of a bolt provided with an axial central hole, the end part of which is inserted into the drilled hole can be expanded, and an expanding dome, which has a conical part for driving into the axial one Central bore of the bolt and at the end facing away from the bolt has a head part, wherein in the end position of the anchoring in the borehole a cavity is formed between the end of the bolt, head part and wall of the borehole for receiving drilling material located in the borehole, characterized in that the bolt (10 ; 122) formed in a manner known per se as a solid bolt with a blind hole as an axial central bore and the head part (38; 92) of the expanding mandrel (32; 84) is designed as a flange with a diameter essentially corresponding to the cross-section of the borehole. 2. Anchoring according to claim 1, characterized in that the expanding mandrel (32; 84), such as known per se, between the head part (92) designed as a flange and the conical part (88) has a cylindrical portion (90) of smaller diameter and that the total length of the expanding dome is greater than the depth of the central hole in the solid bolt. 3. Anchoring according to claim 1 or 2, characterized in that the end of the expanding dome (32; 84) facing the bolt has a substantially cylindrical portion (36; 86) whose diameter is slightly larger than the diameter of the central bore (124) . 4. Anchoring according to claim 1, 2 or 3, characterized in that, as known per se, the expandable end part of the bolt with an undercut ring (24; 80) and with clearance rings (22; 78) is provided. 1 sheet of drawings