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WO2002012736A1 - Vis pour beton et maçonnerie - Google Patents

Vis pour beton et maçonnerie Download PDF

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Publication number
WO2002012736A1
WO2002012736A1 PCT/AU2001/000958 AU0100958W WO0212736A1 WO 2002012736 A1 WO2002012736 A1 WO 2002012736A1 AU 0100958 W AU0100958 W AU 0100958W WO 0212736 A1 WO0212736 A1 WO 0212736A1
Authority
WO
WIPO (PCT)
Prior art keywords
thread
core
shank
fastener
concrete
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/AU2001/000958
Other languages
English (en)
Inventor
Saman Fernando
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Reid Construction Systems Pty Ltd
Original Assignee
Reid Construction Systems Pty Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Reid Construction Systems Pty Ltd filed Critical Reid Construction Systems Pty Ltd
Priority to AU2001278303A priority Critical patent/AU2001278303A1/en
Priority to NZ524480A priority patent/NZ524480A/en
Publication of WO2002012736A1 publication Critical patent/WO2002012736A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/001—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed
    • F16B25/0026—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed the material being a hard non-organic material, e.g. stone, concrete or drywall
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/0036—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw
    • F16B25/0042—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw
    • F16B25/0052—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw the ridge having indentations, notches or the like in order to improve the cutting behaviour
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/0036—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw
    • F16B25/0042—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw
    • F16B25/0057—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw the screw having distinct axial zones, e.g. multiple axial thread sections with different pitch or thread cross-sections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/0036—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw
    • F16B25/0042—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw
    • F16B25/0068—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw with multiple-threads, e.g. a double thread screws
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/0036—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw
    • F16B25/0078—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw with a shaft of non-circular cross-section or other special geometric features of the shaft

Definitions

  • This invention concerns threaded anchors for use in masonry and concrete.
  • Masonry/concrete anchors are widely used in the construction industry mostly for non-structural applications. These anchors can be broadly classified into expansion anchors, undercut anchors, bonded anchors, plastic inserts, powder actuated anchors and screw anchors.
  • undercut anchor is the only type acceptable for structural application. Almost all of the other type anchors have highly variable load carrying capacities, which are highly dependent on the particular installation. This variability does not allow them to be used as structural anchors.
  • a major limitation is that most types of anchors rely upon friction between the wall of a hole and the anchor within it. In order to increase this friction, the anchor is expanded in the hole. But the expansion forces induce significant tensile stresses in the concrete, which is undesirable.
  • the strength of the connection is highly dependent on the care and skill used in the installation procedure (ii) even when installed with care, there can be a large variation in strength from fastener to fastener (iii) they generate significant tensile stresses on concrete (iv) they are unsuitable for cracked concrete
  • undercut anchor is the post-cast installation mechanical anchor mostly recognised as designed for structural applications because it does not depend on friction force and imparts no expansion force on the concrete.
  • An aim of the present invention is to provide a concrete anchor and a method of installing a concrete anchor which overcomes, or at least minimizes, these disadvantages and difficulties.
  • a further aim of the invention is to provide a system for anchoring into concrete which is sufficiently reliable to be used in structural applications.
  • first slip load of a concrete anchor is considered as equivalent to the yield load in a standard bolt.
  • the standard practice is to limit the permissible load of an expansion anchor to 0.65 of the first slip load.
  • An increase in the first slip load is an important beneficial feature for a concrete anchor. An aim of the present invention is to provide this.
  • the invention provides a thread-forming screw fastener for direct screwing into a pre-drilled hole in a concrete or masonry substrate, wherein: (a) the fastener has:
  • a head for engagement with an installation tool for rotating the screw, (ii) at its other end a leading tip for insertion into the hole, and (iii) a shank comprising a core with a concrete-engaging or masonry-engaging helical thread ridge rising from the core and extending over at least part of the length of the shank;
  • the thread ridge rises from the core over less than 15% of the core's surface.
  • the pitch of the thread is from 0.5 to 1.5 times the diameter of the core.
  • the increase in the outside diameter of the shank over said first portion of the threaded part may be accomplished by either an increase in the diameter of the core, or by an increase in the height of the thread ridge rising from the core or by both in combination.
  • the invention provides a thread-forming screw fastener for direct screwing into a pre-drilled hole in concrete or masonry substrate, wherein the fastener has:
  • a leading tip for insertion into the hole, (c) between the head and the tip, a shank comprising a core with a concrete-engaging or masonry-engaging helical thread ridge rising from the core over at least part of the length of the shank; and (d) on the leading tip, a twin-start thread wherein: (i) one ridge of the twin-start thread gradually rises to the height of, and continues as, the thread ridge on the shank, and (ii) the height of the second ridge of the twin-start thread remains less than 50% of the height of the thread ridge on the shank
  • leading tip has a length of from 1 to 2 pitch lengths of the thread on the shank.
  • leading tip tapers from the core diameter of the shank to between 85% and 90% of the core diameter of the shank.
  • the invention provides a thread-forming fastener for direct screwing into a pre-drilled hole in concrete or masonry, said fastener having: (a) a shank comprising a core with a concrete-engaging or masonry-engaging helical thread ridge rising therefrom and extending over at least part of the length of the shank; (b) on said threaded part of the shank, the thread ridge covering less than 30% of the core's surface; and (c) over at least part of the threaded portion of the shank, grooves let into the core and spiraling along the shank at approximately right angles to the thread ridge to form a grooved portion of the shank.
  • the grooves pass through the thread ridge where the grooves intersect with the thread.
  • the grooved portion of the core reduces in diameter at a rate which is substantially linear as it approaches the leading tip of the fastener.
  • the invention provides a method of anchoring a fastener to concrete or masonry comprising: (i) selecting a fastener as defined above;
  • Figure 1 is a side view of a first embodiment of a masonry screw according to the present invention
  • Figure 2 is a detail of the thread at the point marked A in Figure 1;
  • Figure 3 is a side view of a second embodiment of a screw according to the invention.
  • Figure 4 is a cross-section view through B-B shown on Figure 3;
  • Figure 5 is a view of the screw portion where circled and labelled C in Figure 3;
  • Figure 6 is a cross section detail view of the screw portion indicated in the direction and position of arrow D on Figure 3;
  • Figure 7 is a partially cut away side view of a further embodiment of a masonry screw according to the present invention.
  • Figure 8 is a view of an additional screw illustrating an alternative head shape; and Figure 9 is a cross section view of part of the screw shown in Figure 8.
  • the screw 2 has a hexagonal head 4 and a shank portion 6 extending to the leading tip 8. Immediately beneath the head is a shoulder portion 10 which acts in use as a bearing surface.
  • the shank 6 carries a single start helical thread 24 which rises from a core 22.
  • the thread 24 varies in outside diameter as described later in this specification, but its pitch remains constant over its full length.
  • the surface of the shank comprises mostly the surface of the core 22 and only about 12% of the core's surface is covered by the thread which rises from the core.
  • the shank 6 has six distinct zones along its length. Commencing from the leading tip 8 of the screw and working towards the head, these zones are respectively a tip zone 12, a lead-in zone 13, a main thread cutting zone 14, a mid tapering zone 15, a mid anchoring zone 16, and a plain shank zone 20. In order to describe the extent of these zones we will refer to "pitch lengths" or “pitches” as a unit of length. That unit is the pitch of the thread 24, which is equal to the axial distance between ridge tops for a single start thread.
  • the tip zone 12 extends lengthwise along the shank for about one pitch, the lead-in zone 13 for about one pitch, the main thread cutting zone 14 for about one pitch, the mid tapering zone 15 for about one pitch, and the mid anchoring zone for about 5.5 pitches.
  • the length of the unthreaded plain shank zone 20 is selected to provide the required clearance of the shoulder 10 above the concrete surface and its selection depends on the height/thickness of whatever is to be fastened by the screw to the concrete.
  • the core 22 is of uniform diameter and the thread 24 rising from it is of uniform height.
  • the helix angle of the thread indicated by the angle ⁇ in Figure 5 is 10.4°. This angle may be chosen from the range 8° to 26° and is more preferably in the range 9° to 12°.
  • the core 22 of the shank is conically tapered at an angle shown as ⁇ on Fig. 1.
  • the tapering provides a smaller diameter leading tip 8 for easier insertion of the tip into a hole in concrete.
  • the taper angle used in this embodiment is 3° but this may be chosen from the range of2° to 5°.
  • the ridge 39 of thread 24 blends down to the core, again to facilitate easier insertion of the fastener tip and easy start of thread cutting.
  • the thread ridge 39 rises over about a quarter turn to a steady height of about 15% to 40% of the ridge height in the mid anchoring zone 16.
  • the thread ridge 39 gradually rises over a pitch length to a diameter substantially equal to that of the mid anchoring zone 16.
  • the height of the ridge 39 increases gradually over a full turn until, at the head end of the lead-in zone 13, the thread 24 has reached its maximum diameter. That maximum diameter is maintained over the following turn (one pitch length) and this is the main thread cutting zone 14. Over the mid tapering zone 15 (one pitch length) the thread 24 gradually reduces from its maximum outside diameter to the nominal diameter of the screw which is the diameter of the mid anchoring zone 16. As discussed earlier, in zone 16 the thread maintains its nominal outside diameter.
  • Extending over the tip zone 12 and continuing for about half the length of the lead-in zone 13 is an additional thread ridge 48. This is equally spaced between successive turns of ridge 39 so that, in effect, zone 12 and half of zone 13 carry a twin-start thread comprising ridge 39 and ridge 48.
  • ridge 48 remains relatively low and narrow, being only about 20% of the height of ridge 39 on the mid anchoring zone. In zone 12 both threads have similar thread heights.
  • the twin-start thread combined with the tapering of the zones 12 and 13 causes a greatly reduced tendency for the screw to tilt as it feeds into the hole and commences cutting the thread in the concrete.
  • the small thread ridge 48 starts from close to the tip 8 and can conveniently extend for between one and two pitches, so that it may end by tapering to the core at any point along the lead-in zone 13.
  • the head-side flank is inclined at an angle ⁇ of 10° to a plane normal to the bolt axis and the tip side flank is inclined at an angle ⁇ of 45°.
  • the plain shank zone 20 carries no thread nor indentations and extends from where the end of the thread blends down to the core at 36 to the shoulder 10.
  • the length chosen for this plain shank zone 20 corresponds to the thickness of the component to be held by the bolt to the concrete.
  • the core 22 is preferably circular but it may alternatively have a lobed cross section when viewed axially.
  • the height of the thread 24 is constant but is greater than the thread height in the mid anchoring zone 16. In the main thread cutting zone 14 the thread 24 continues to maintain a uniform height pattern above the core 22.
  • uniform height pattern when used above to describe the form of the thread in the tip zone 12 and the main thread cutting zone 14, is intended to encompass the situation where the thread maintains a uniform height above the core or the thread shows some cyclic variation in height above the core.
  • the low ridges on the tip zone 12 commence to locate the screw and feed it in at the desired rate of one thread pitch per rotation of the screw. What is effectively a two-start thread in this zone improves the stability of the location of the screw in the hole and the stability of the feed rate.
  • the ridge 39 which is increasing in height cuts more of the substrate material from the hole wall while the shorter ridge 48 diametrically opposite provides support against tilting or stripping without cutting further material from the walls.
  • the ridge 39 When the main thread cutting zone 14 enters the hole, the ridge 39 has risen to its maximum height and cuts the full thread depth into the wall of the hole. The additional support of auxiliary ridge 48 is not required at this stage and ridge 48 tapers into the core 22 at the start of the main thread cutting zone 14.
  • the thread is cut in the concrete by the ridge 39 where it is taller in the main thread cutting zone 14, whereas the slightly shorter ridge in the mid anchoring zone 16 would have a slight clearance from the cut thread. Nevertheless, the ridge in the mid anchoring zone 16 may perform a clearing operation as a follow up to the main cutting portion.
  • the load is transmitted to the concrete by the threads in the main thread cutting zone 14 and the mid anchoring zone 16.
  • the thread ridges in the tip zone 12 and lead-in zone 13 are of negligible use in supporting a tensile load applied to the screw.
  • the tip 8 is cupped, or concave, to a depth of about 30% of the screw diameter and this cup is useful for containing cuttings from the hole threading operation if the hole is not much deeper than the penetration required for the screw into the hole.
  • the cupping is conveniently formed by metal displaced during a thread rolling operation forming the cup side wall.
  • a preferred method of installing a screw of the present invention is to drill a hole in the concrete or masonry which is slightly greater in diameter than the diameter of the core 22. This significantly reduces the torque required for installation. A typical clearance would be 0.1mm all around so the hole would be 0.2mm greater in diameter than the diameter of the core 22.
  • the embodiment illustrated in Figure 3 is a screw 102 the same as that shown in Figure 1 except for the addition of helical grooves 126 let into the shank 106 of the fastener and notches 138 let into the thread 124. The grooves are let into the shank along the full length of the the main thread cutting zone 114.
  • the preferred embodiment has six of these grooves evenly spaced around the circumference as best seen in Figure 4.
  • the grooves 126 divide the thread 124 into segments 127 each extending for approximately 60° around the core 122. For each thread segment 127, the grooves provide a sharp edge to the end 128 closest to the leading tip 108 to facilitate better cutting of a thread into the concrete.
  • the grooves 126 also provide a space where cuttings, produced when threading the hole, can be accommodated and transported to the bottom of the hole in the concrete due to the action of gravity and vibration during installation. As the thread cutting proceeds in such small steps, the dust produced is fine and so is able to be transported along the grooves in the way described.
  • Each thread segment 127 tapers from a high point at its tip end 128 to a low point at its head end 130. This provides a small gap between most of the thread ridge in the main thread cutting zone 114 and the thread cut into the concrete and contributes to reducing the friction torque acting against the rotation of the bolt during installation, so promoting efficient thread cutting.
  • the thread ridge on the screw is of uniform height in order to maximize the load bearing area between the screw and the concrete, and there are no grooves let into the core.
  • the thread 124 Over the mid anchoring zone 116 the thread 124 carries a series of notches 138 on its crest. Some of these are shown in more detail in Figures 5 and 6.
  • the notches 138 track helically around the shank at an angle ⁇ to the bolt axis as shown in Figure 5. In this embodiment the angle ⁇ is 20°, which is greater than the value of 10° for the corresponding angle ⁇ followed by the grooves 126. There are two such tracks of notches 138, 180° apart on the shank.
  • each notch 138 penetrates to approximately 80% of the full depth of the thread ridge 139.
  • the notches 138 serve to clean up the thread in the concrete as the bolt is rotated into position; they provide an additional space where minor debris may be accommodated so the debris does not hinder rotation of the bolt. This provides for a reduced installation torque.
  • a Bellville washer may be used, as a separate component, in conjunction with the screws described above.
  • a key characteristic of a Bellville washer is that as its dished shape is compressed during installation, the reaction force it expresses first increases and then, after a certain further compression, decreases. Tightening a Bellville washer to this degree imparts a locking characteristic to the threaded fastening concerned as the forces involved mean that a greater turning force is required to uncompress the washer than to compress it further.
  • the present invention envisages forming the head of a threaded fastener in such a way to incorporate into the head the above described displacement-load characteristic. In this way only a single component need be handled and, as incorrect washers cannot then be used by mistake, the correct load characteristics are ensured for any given anchor application.
  • An example of a screw having such a head is shown in Figure 8 and a cross section detail of the head end of that screw is shown in Figure 9.
  • a flange extension 310 Extending from the underside of the screw head 304 is a flange extension 310.
  • the flange extension 310 is dished towards the loading tip 308 in such a way that it flexes with similar displacement-load characteristics to a Bellville washer and therefore the screw 302 with its flexing flange extension has the same general performance characteristic of screw 2 with a separate Bellville washer in that it resists loosening of the screw.
  • a circular ring- like channel 311 is formed in the underside of the head 304 deep within the dishing 309 and just inboard of the radially outer faces 305 of the head 304.
  • the screw 202 shown in Figure 7 is very similar to that shown in Figure 3. The difference is that the shank towards the tip end has a slightly different shape which may give improved performance in some situations. Whereas the screw in Figure 3 has a cylindrical core on the main thread cutting zone 114, and conical cores on the tip lead-in zones 112, the embodiment in Figure 7 has the core reducing over part of the main thread cutting zone 214 also.
  • the tip zone 212, lead-in zone 213 and main thread cutting zone 214 have a core with an ellipsoidally shaped longitudinal cross section.
  • the imaginary continuation of that ellipse is shown by dashed line 263. Therefore, over the entry and thread cutting zone 261, the diameter of the core gradually reduces at a rate which increases as it approaches the tip of the bolt.
  • the cross-section may be made a close parabolic equivalent instead of elliptical without a substantial loss of performance.
  • An elliptical profile of this type provides a good reduction of the diameter of the screw leading tip 208 to provide ease of entry of the screw into the hole and a more even rate of thread cutting over the length of the tip zone 212, lead-in zone 213 and thread cutting zone 214 when compared with the configuration shown in Figure 1.
  • the anchor screws cutting its thread as it goes, initially the depth of thread increases relatively quickly with each 1/6 turn but then the increase in thread depth becomes less with each 1/6 turn.
  • a smaller increase in thread depth is required for the same volume of material to be removed because the thread is increasing in width as well as depth.
  • the elliptical profile allows the rate of material removal to be constant, or at least more evenly spread, over the length of the tip, lead-in and thread cutting zones 212, 213 and 214 respectively.
  • the above described anchors may be screwed into normal strength or high strength concrete or fibre reinforced concrete or suitable masonry materials.
  • the screws according to the above described embodiments of the present invention are preferably made from a steel which provides both a high degree of cold formability (to allow for the thread to be formed in a single rolling operation) and a high surface hardness after heat treatment.
  • the screws are preferably manufactured from headed blanks in a single thread rolling operation followed by a case-hardening operation.
  • a thread rolling operation would preferably form all the grooves 126 and notches 138 in addition to the ridges.
  • sequential or multiple thread rolling operations may be used.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Mechanical Engineering (AREA)
  • Dowels (AREA)
  • Joining Of Building Structures In Genera (AREA)

Abstract

Dispositif de fixation (2) se présentant sous la forme d'une vis filetée pouvant être engagée directement dans un orifice percé au préalable dans un substrat de béton ou de maçonnerie. Cette vis possède une tête (4) à une extrémité servant à la faire tourner et, à l'autre extrémité, une pointe (8) servant à l'introduire dans le perçage. Cette tige (6) comporte une prolongation (22) pourvue d'arêtes surélevées (39) formant des filets hélicoïdaux s'introduisant dans le béton ou dans la maçonnerie, cette prolongation s'étendant au moins sur une partie de la longueur de la tige (6). Sur la partie filetée de la tige, les arêtes (39) s'élèvent depuis ladite partie (22) de moins de 30 % de la surface de la prolongation de la tige. Depuis la pointe (8) de la vis, le diamètre extérieur du filet (24) augmente graduellement sur une première partie (12, 13) de la partie filetée. Le diamètre extérieur du filetage reste sensiblement constant sur une deuxième partie (14) de ce filetage contiguë à la première partie. Sur une troisième partie (15, 16) du filetage, contiguë à la deuxième partie (14) et éloignée de la première partie (12, 13), le diamètre extérieur du filetage (24) est inférieur à celui de la deuxième partie (14).
PCT/AU2001/000958 2000-08-04 2001-08-06 Vis pour beton et maçonnerie Ceased WO2002012736A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU2001278303A AU2001278303A1 (en) 2000-08-04 2001-08-06 Screw for concrete and masonry
NZ524480A NZ524480A (en) 2000-08-04 2001-08-06 Screw for concrete and masonry with varying outside diameter over thread

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPQ9192A AUPQ919200A0 (en) 2000-08-04 2000-08-04 Improvements relating to screws for concrete and masonry
AUPQ9192 2000-08-04

Publications (1)

Publication Number Publication Date
WO2002012736A1 true WO2002012736A1 (fr) 2002-02-14

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2001/000958 Ceased WO2002012736A1 (fr) 2000-08-04 2001-08-06 Vis pour beton et maçonnerie

Country Status (3)

Country Link
AU (1) AUPQ919200A0 (fr)
NZ (1) NZ524480A (fr)
WO (1) WO2002012736A1 (fr)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006133542A1 (fr) * 2005-06-16 2006-12-21 Walther, Gerda Vis à utiliser dans le béton
EP1795768A1 (fr) * 2005-12-07 2007-06-13 fischerwerke Artur Fischer GmbH & Co. KG Vis autotaraudeuse, notamment vis à béton
DE102011008167A1 (de) * 2011-01-10 2012-07-12 Gerhard Kälber Teilgewindeschraube
DE102011007406A1 (de) * 2011-04-14 2012-10-18 TOGE-Dübel A. Gerhard KG Gewindeschneidende Schraube
RU2472983C2 (ru) * 2007-06-18 2013-01-20 Байотекнолоджи Инститьют, И Мас Д, С.Л. Резьбовое соединение с изменяющимся зазором
EP2980424A1 (fr) * 2014-07-31 2016-02-03 King Point Enterprise Co., Ltd Boulon de fixation destiné à être utilisé dans du béton
WO2021023665A1 (fr) * 2019-08-08 2021-02-11 Ludwig Hettich Holding Gmbh & Co. Kg Système de fixation d'un ancrage dans un substrat minéral
KR20210021562A (ko) * 2018-06-21 2021-02-26 에요트 게엠베하 앤드 코. 카게 태핑 나사
US11116557B2 (en) 2017-12-06 2021-09-14 Stryker European Operations Holdings Llc Orthopedic locking screw
CN115698522A (zh) * 2020-07-14 2023-02-03 喜利得股份公司 具有分隔楔形凹槽的混合螺钉
TWI799603B (zh) 2018-06-21 2023-04-21 德商毅結特有限兩合公司 螺絲、製造螺接件的方法、及螺接件
US20230279891A1 (en) * 2020-07-14 2023-09-07 Hilti Aktiengesellschaft Hybrid screw, with thread reaching further back than wedge
KR102891375B1 (ko) * 2018-06-21 2025-11-27 에요트 에스이 앤드 컴퍼니 케이쥐 플라스틱 체결용 나사

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US3902399A (en) * 1970-02-03 1975-09-02 Vincent Yotti Concrete screw
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WO2006133542A1 (fr) * 2005-06-16 2006-12-21 Walther, Gerda Vis à utiliser dans le béton
EP1795768A1 (fr) * 2005-12-07 2007-06-13 fischerwerke Artur Fischer GmbH & Co. KG Vis autotaraudeuse, notamment vis à béton
RU2472983C2 (ru) * 2007-06-18 2013-01-20 Байотекнолоджи Инститьют, И Мас Д, С.Л. Резьбовое соединение с изменяющимся зазором
DE102011008167A1 (de) * 2011-01-10 2012-07-12 Gerhard Kälber Teilgewindeschraube
DE102011007406A1 (de) * 2011-04-14 2012-10-18 TOGE-Dübel A. Gerhard KG Gewindeschneidende Schraube
EP2980424A1 (fr) * 2014-07-31 2016-02-03 King Point Enterprise Co., Ltd Boulon de fixation destiné à être utilisé dans du béton
US11116557B2 (en) 2017-12-06 2021-09-14 Stryker European Operations Holdings Llc Orthopedic locking screw
US12108972B2 (en) 2017-12-06 2024-10-08 Stryker European Operations Holdings Llc Orthopedic locking screw
KR102848171B1 (ko) * 2018-06-21 2025-08-19 에요트 에스이 앤드 컴퍼니 케이쥐 태핑 나사
KR20210021562A (ko) * 2018-06-21 2021-02-26 에요트 게엠베하 앤드 코. 카게 태핑 나사
KR102891375B1 (ko) * 2018-06-21 2025-11-27 에요트 에스이 앤드 컴퍼니 케이쥐 플라스틱 체결용 나사
US12372111B2 (en) 2018-06-21 2025-07-29 Ejot Gmbh & Co. Kg Screw for screwing into plastic
TWI799603B (zh) 2018-06-21 2023-04-21 德商毅結特有限兩合公司 螺絲、製造螺接件的方法、及螺接件
TWI811385B (zh) * 2018-06-21 2023-08-11 德商毅結特有限兩合公司 自攻螺絲
US11754110B2 (en) 2018-06-21 2023-09-12 Ejot Gmbh & Co. Kg Self-tapping screw
US12025167B2 (en) 2019-08-08 2024-07-02 Ludwig Hettich Holding Gmbh & Co. Kg System for securing an anchor in a mineral substrate
US12049913B2 (en) 2019-08-08 2024-07-30 Ludwig Hettich Holding Gmbh & Co. Kg System for securing an anchor in a mineral substrate
US12234851B2 (en) 2019-08-08 2025-02-25 Ludwig Hettich Holding Gmbh & Co. Kg System for securing an anchor in a mineral substrate
WO2021023652A1 (fr) * 2019-08-08 2021-02-11 Ludwig Hettich Holding Gmbh & Co. Kg Système de fixation d'un ancrage dans un substrat minéral
WO2021023665A1 (fr) * 2019-08-08 2021-02-11 Ludwig Hettich Holding Gmbh & Co. Kg Système de fixation d'un ancrage dans un substrat minéral
US20230279891A1 (en) * 2020-07-14 2023-09-07 Hilti Aktiengesellschaft Hybrid screw, with thread reaching further back than wedge
CN115698522A (zh) * 2020-07-14 2023-02-03 喜利得股份公司 具有分隔楔形凹槽的混合螺钉

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