WO2012084385A1 - Vis d'ancrage - Google Patents

Vis d'ancrage Download PDF

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Publication number
WO2012084385A1
WO2012084385A1 PCT/EP2011/070737 EP2011070737W WO2012084385A1 WO 2012084385 A1 WO2012084385 A1 WO 2012084385A1 EP 2011070737 W EP2011070737 W EP 2011070737W WO 2012084385 A1 WO2012084385 A1 WO 2012084385A1
Authority
WO
WIPO (PCT)
Prior art keywords
screw anchor
thread
cutting spring
screw
spring
Prior art date
Application number
PCT/EP2011/070737
Other languages
German (de)
English (en)
Inventor
Falk Rosenkranz
Isaiah Freerksen
Ralf Zitzmann
Original Assignee
Hilti Aktiengesellschaft
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 Hilti Aktiengesellschaft filed Critical Hilti Aktiengesellschaft
Publication of WO2012084385A1 publication Critical patent/WO2012084385A1/fr

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
    • F16B37/00—Nuts or like thread-engaging members
    • F16B37/12—Nuts or like thread-engaging members with thread-engaging surfaces formed by inserted coil-springs, discs, or the like; Independent pieces of wound wire used as nuts; Threaded inserts for holes
    • F16B37/122—Threaded inserts, e.g. "rampa bolts"
    • F16B37/125—Threaded inserts, e.g. "rampa bolts" the external surface of the insert being threaded
    • F16B37/127—Threaded inserts, e.g. "rampa bolts" the external surface of the insert being threaded and self-tapping
    • 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
    • F16B25/0094—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw the screw being assembled or manufactured from several components, e.g. a tip out of a first material welded to shaft of a second material

Definitions

  • the invention relates to a screw anchor, in particular for screwing in concrete.
  • Screw anchors are known from the prior art, which have a threaded shaft.
  • the thread is intended to cut into the wall of a hole in concrete or a similar material, so that an undercut is formed, can be derived directly from the loads (ie without intermediate dowel or other components) in the ground. So that the thread of the screw anchor can reliably cut into the concrete, the hardness on the surface of the screw anchor must be on the order of 650 HV or above.
  • a screw anchor made of a low carbon steel is carbonitrided and quenched. In this way, the necessary hardness is achieved. Subsequently, the screw anchor is stress annealed to reduce or eliminate the stresses generated during quenching.
  • the disadvantage of this method is that the boron, which is contained in the steel, causes a high hardness in the core. In particular, a hardness above 330 HV results in the core of the shaft. This hardness leads to a high risk of hydrogen embrittlement.
  • the screw anchor which consists of a low-carbon steel, is carbonitrided and quenched. Then, the blanks are annealed at a comparatively high temperature to lower the hardness of the screw throughout the shank to a uniform value. Subsequently, the tip of the anchor is induction hardened and quenched to achieve the necessary hardness for cutting the thread into the concrete.
  • This method has the disadvantage that it takes a relatively long time due to the tempering of the material and the overall effort is relatively high, since induction hardening requires an additional process step. However, such a screw anchor is less susceptible to hydrogen embrittlement.
  • the applicant discloses a fastening system known as "coil anchor” which includes a concrete screw and a spring attachment which is placed on the top of the concrete screw Tighten the screw, pressing the spring attachment against the wall of the bore.
  • the object of the invention is to provide a screw anchor, which is characterized by low production costs and high performance.
  • a screw anchor with a head, a shank and a thread at the end facing away from the head end of the shaft is provided according to the invention, and with a cutting spring which is at least partially screwed onto the thread.
  • the invention is based on the idea of not producing the undercut of a screw anchor by the thread of the screw anchor itself, but by the cutting spring, which cuts into the wall of the bore when screwing the screw anchor. This allows to perform only the cutting spring with the necessary hardness.
  • the actual screw anchor must be subjected to no heat treatment and can therefore consist of a cheaper material.
  • the thread corresponds to a maximum of twice the length of the cutting spring. It has been found that even a very short thread is sufficient to accommodate the cutting spring at the front end of the screw. This results in lower production costs, since only a small part of the shaft must be threaded.
  • the thread tapers conically towards the tip. This ensures that the cutting spring is spread apart when screwing the screw anchor and thus can cut very well into the wall of the bore.
  • the shaft consists of an unhardened steel. This reduces the risk of hydrogen embrittlement.
  • the cutting spring made of hardened steel. This leads to a very high surface hardness, so that the Cutter spring can cut reliably into the wall of the bore and there forms the undercut, which is necessary for load transfer.
  • the cutting spring on about three turns. This embodiment is based on the recognition that even very few Wnditch the cutting spring sufficient to transfer the loads with the desired reliability can.
  • the cutting spring has a teardrop-shaped cross-section, wherein the tip of the teardrop-shaped cross-section points outwards.
  • a cross-sectional shape has been found to be particularly favorable, since on the inside of the cutting spring a uniformly rounded cross section is available, which is suitable for uniform load transfer to the screw anchor, and on the other hand on the outside of the cutting spring a comparatively sharp cross section comparable to Burr of a thread is present, which cuts well into the ground, for example in concrete.
  • the drop-shaped cross section of the cutting spring can have a symmetrical shape with respect to an axis of symmetry; Alternatively, however, a shape is possible which deviates from the symmetrical shape.
  • the tip of the teardrop-shaped cross-section is inclined away from the axis of symmetry.
  • Figure 1 shows a schematic cross section of a screw anchor invention with cutting spring
  • Figure 2 shows schematic cross sections of the cutting spring.
  • FIG. 1 shows a screw anchor 10 which has a head 12 and a shaft 14.
  • a thread 16 is provided, which is formed catchy and in which each thread, viewed in cross section, has a circular-segment-shaped shape.
  • the end of the shaft 14 facing away from the head is conical, so that the thread 16 extends from the conical section to the cylindrical part of the shaft 14.
  • the thread 16 is for the most part on the conical portion of the shaft, and the total thread is shorter than the total length of the shaft. In particular, the thread 16 extends over less than half of the shaft 14.
  • a cutting spring 18 is arranged, which is similar to its structure of a cylindrical coil spring. The cutting spring 18 is much shorter than the shank of the screw anchor 10 and in particular shorter than the thread 16. In the embodiment shown, the cutting spring 18 three turns, while the thread 16 has about six threads.
  • the cutting spring 18 has a teardrop-shaped cross section, with the tip of the teardrop-shaped cross section facing outward. Thus, located on the inside of each turn a circular section-shaped surface whose dimensions are adapted to the dimensions of the threads of the thread 16.
  • the inner diameter of the cutting spring 18 is chosen so that the cutting spring 18 can be screwed one to two threads on the thread 16, but then it comes to a slight jamming.
  • the bolt 10 is preferably made of kaltverform ble steel and is made by mechanical forming.
  • the thread 16 is rolled.
  • a heat treatment is not required.
  • the cutting spring 18 is made of a hardenable stainless steel and is hardened so that its surface has the necessary surface hardness for cutting into concrete or a similar substrate. Suitable hardness values are in the order of 600 HV. But it is also possible to use galvanized carbon steel.
  • the coil spring 18 is shown in various embodiments.
  • FIGS. 2 a) and b) show the cross section of a cutting spring 18 with a symmetrical geometry with respect to the axis of symmetry 22, wherein the tip in FIG. 2 a) is concave and convex in FIG. 2 b).
  • Figure 2 c) shows a cutting spring 18, wherein the cross section has a different geometry from the symmetrical shape.
  • the tip of the spring is no longer on the axis of symmetry 22nd
  • the screw anchor 10 can be inserted with arranged at its tip cutting spring 18 in a well 20 schematically shown here. Then, when the screw anchor 10 is rotated inside the borehole 20, the cutting spring 18 screws onto the thread 16. She is braced against the concrete. Due to the friction between the cutting spring 18 and the wall of the borehole 20, the cutting spring 18 initially remains in its position, so that the screw anchor 10 is screwed into the cutting spring 18. Only when the cutting spring 18 is screwed a certain distance on the thread 16, it reaches a point at which it is prevented by the thread 16 on further screwing. From this point, the cutting spring 18 rotates during further screwing the bolt 10 together with this, so that the now expanded and tensioned against the concrete cutting spring 18 cuts into the wall of the borehole 20 and there forms a mating thread with strong undercut.
  • the screw anchor described allows high payloads even in cracked concrete, as the loads are transmitted with a pronounced undercut very deep in the hole. Such an undercut can not be achieved with a conventional concrete screw, since such a concrete screw whose outer diameter would have to be very large in relation to the borehole, would not cut at the borehole mouth. In addition, such a concrete screw with such a large ratio of outer diameter to core diameter would not be economically produced.
  • the described screw anchor with cutting spring with comparatively little effort to produce, since only the cutting spring 18 must be subjected to a heat treatment.
  • the screw anchor 10 can be prepared by conventional cold forming. This also means that there is no risk of hydrogen embrittlement in the shank area of the screw anchor, since it is not hardened.

Landscapes

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

Abstract

L'invention concerne une vis d'ancrage (10) qui présente une tête (12), une tige (14) et un filet (16) sur l'extrémité de la tige (14) opposée à la tête, ainsi qu'un ressort de coupe (18) qui est vissé au moins en partie sur le filet (16).
PCT/EP2011/070737 2010-12-21 2011-11-23 Vis d'ancrage WO2012084385A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201010063682 DE102010063682A1 (de) 2010-12-21 2010-12-21 Schraubanker
DE102010063682.7 2010-12-21

Publications (1)

Publication Number Publication Date
WO2012084385A1 true WO2012084385A1 (fr) 2012-06-28

Family

ID=45002969

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2011/070737 WO2012084385A1 (fr) 2010-12-21 2011-11-23 Vis d'ancrage

Country Status (2)

Country Link
DE (1) DE102010063682A1 (fr)
WO (1) WO2012084385A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013219013A1 (de) 2013-09-20 2015-03-26 Böllhoff Verbindungstechnik GmbH Federverbindungselement
EP3869051A1 (fr) 2020-02-18 2021-08-25 Hilti Aktiengesellschaft Vis inoxydable bimétallique
EP4184021A1 (fr) 2021-11-18 2023-05-24 Hilti Aktiengesellschaft Vis à trois composants

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3153723A1 (fr) 2015-10-06 2017-04-12 HILTI Aktiengesellschaft Vis autotaraudeuse ayant une spirale filetee separee et differents pas angulaires partiels

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1230603A (en) * 1914-07-21 1917-06-19 Julian Richmond Screw-anchor.
GB179144A (en) * 1921-04-23 1923-05-24 Belge Pour La Fabrication De R A reinforcement for holding-down bolts
DE839692C (de) * 1950-05-21 1952-05-23 Christof Sturm Schraubverbindung fuer Holzteile
EP1498618A2 (fr) * 2003-07-15 2005-01-19 Adolf Würth GmbH & Co. KG Vis pour matériaux durs
US20100180541A1 (en) * 2009-01-20 2010-07-22 Chong Ming Lee Reusable Expansion Anchoring Assembly and Setting Method Thereof

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1966520A (en) * 1930-09-10 1934-07-17 Rayner John Art of threaded fastening
US3983736A (en) * 1975-01-17 1976-10-05 King John O Jun Helically wound mandrel assembly
DD276713A1 (de) * 1988-11-07 1990-03-07 Univ Magdeburg Tech Befestigungselement zur verankerung in bauwerksteilen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1230603A (en) * 1914-07-21 1917-06-19 Julian Richmond Screw-anchor.
GB179144A (en) * 1921-04-23 1923-05-24 Belge Pour La Fabrication De R A reinforcement for holding-down bolts
DE839692C (de) * 1950-05-21 1952-05-23 Christof Sturm Schraubverbindung fuer Holzteile
EP1498618A2 (fr) * 2003-07-15 2005-01-19 Adolf Würth GmbH & Co. KG Vis pour matériaux durs
US20100180541A1 (en) * 2009-01-20 2010-07-22 Chong Ming Lee Reusable Expansion Anchoring Assembly and Setting Method Thereof

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013219013A1 (de) 2013-09-20 2015-03-26 Böllhoff Verbindungstechnik GmbH Federverbindungselement
WO2015039997A1 (fr) 2013-09-20 2015-03-26 Böllhoff Verbindungstechnik GmbH Élément de liaison élastique
US9909603B2 (en) 2013-09-20 2018-03-06 Böllhoff Verbindungstechnik GmbH Spring connection element
US10626900B2 (en) 2013-09-20 2020-04-21 Böllhoff Verbindungstechnik GmbH Spring connection element
EP3869051A1 (fr) 2020-02-18 2021-08-25 Hilti Aktiengesellschaft Vis inoxydable bimétallique
WO2021165094A1 (fr) 2020-02-18 2021-08-26 Hilti Aktiengesellschaft Vis inoxydable bimétallique
EP4184021A1 (fr) 2021-11-18 2023-05-24 Hilti Aktiengesellschaft Vis à trois composants
WO2023088724A1 (fr) 2021-11-18 2023-05-25 Hilti Aktiengesellschaft Vis à trois composants

Also Published As

Publication number Publication date
DE102010063682A1 (de) 2012-06-21

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