US20020046535A1 - Tubular anchor - Google Patents

Tubular anchor Download PDF

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Publication number
US20020046535A1
US20020046535A1 US09/829,284 US82928401A US2002046535A1 US 20020046535 A1 US20020046535 A1 US 20020046535A1 US 82928401 A US82928401 A US 82928401A US 2002046535 A1 US2002046535 A1 US 2002046535A1
Authority
US
United States
Prior art keywords
anchor
anchor body
profile
tubular
tubular anchor
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.)
Abandoned
Application number
US09/829,284
Other languages
English (en)
Inventor
Wolfgang Ludwig
Erich Leibhard
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.)
Hilti AG
Original Assignee
Hilti AG
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 AG filed Critical Hilti AG
Assigned to HILTI AKITIENGESELLSCHAFT reassignment HILTI AKITIENGESELLSCHAFT ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LIEBHARD, ERICH, LUDWING, WOLFGANG
Publication of US20020046535A1 publication Critical patent/US20020046535A1/en
Abandoned legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
    • E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts

Definitions

  • the present invention relates to a tubular anchor, in particular, for mine and tunnel construction for insertion in a bore formed in a mine or tunnel gallery, with the tubular anchor having a hollow anchor body, and a trapezoidal thread-shaped profile provided on at least a portion of an outer surface of the anchor body and having a crest region and a root region both extending parallel to a longitudinal axis of the anchor body.
  • Tubular anchors are generally known. They function primarily as roof bolts for stabilization of walls of hollow spaces such tunnels, galleries and the like. They are used primarily for securing to each other following each other, in a direction transverse to the wall, the wall-forming strata. In many cases, the mechanical characteristics of the layers, which lie in immediate vicinity of the wall surface, in particular, their supporting resistance, changes as a result of formation of a hollow space. Therefore, these layers need be secured to further located, undamaged or unaffected layers or strata.
  • the tubular anchor is primarily secured in a bore with a mortar mass. As a mortar mass, e.g., a two-component adhesive, in particular, an epoxyacrylate resin with a hardener, is used.
  • the mortar mass is intermixed and hardens, anchoring the tubular anchor in the bore.
  • the end of an anchor rod, which projects from the bore, is, in most cases, provided with a thread.
  • a constructional component is secured on the projected end of the anchor rod with a nut.
  • a tubular anchor of the type discussed above is disclosed, e.g., in German Utility model DE 29 501 638.
  • the known tubular anchor is formed of an anchor body provided with a shaped profile.
  • the shaped profile is formed as a single trapezoidal thread. This insures the possibility to use the tubular anchor with a conventional drilling tool.
  • the drawback of the known tubular anchor consists in that the holding value of the known anchor is substantially reduced in case fissures or cracks are present in the bore region.
  • an object of the present invention is to provide a tubular anchor with such a profile that would insure a high holding value even in a cracked constructional component.
  • Another object of the present invention is to provide a tubular anchor that can be easily and rapidly set in a bore.
  • a tubular anchor with trapezoidal thread-shaped profile in which at least the flanks of a trapezoidal cross-section of the profile remote from an end of the anchor body facing in a setting direction are inclined with respect to the longitudinal axis of the anchor body at an angle from 10° to 45°.
  • the foregoing profile of the thread insures a secondary expansion of the inventive tubular anchor.
  • the secondary expansion takes place, in particular, when the tubular anchor is provided with an anti-stick coating or the mortar mass is so formed that no adhesion occurs between the mortar mass and the anchor.
  • the foregoing inclination of the profile flanks favorably influences the setting process.
  • the inclination of the flanks, together with high cohesion of the mortar mass insures retention of the inventive tubular anchor in a bore of a constructional component during the setting process. Thereby, the holding time, during which the tubular anchor should be stably held in the bore until the mortar mass becomes almost completely hardened, is eliminated.
  • An optimal secondary expansion is obtained when the flanks are inclined at an angle of about 20°. To insure a simple formation of the trapezoidal thread, advantageously, both opposite flanks have the same inclination.
  • the axial extent of the root region is so selected that it corresponds to from 0.04 to 0.1 times of the diameter of the anchor body.
  • the axial extent of the crest region is also so selected that it corresponds to from 0.04 to 0.1 times of the anchor body diameter. Thereby, the profile of the anchor can withstand sufficiently high shear forces generated by the load resulting from tightening of the nut or the like.
  • the height of the profile in the radial direction advantageously, corresponds to from 0.25 to 0.75 times of the wall thickness of the anchor. This insures an economical manufacturing of the profiled tubular anchor.
  • the threaded profile has, preferably, a pitch from 10 mm to 40 mm. This insures a uniform distribution of the mortar mass between the bore wall and the profile of the tubular anchor.
  • the profile formed according to the present invention increases the holding value, with which the inventive tubular anchor is held in the constructional component, insuring, at the same time, an adequate removing rate with which the drilling dust is removed.
  • the thread pitch should be about 15 mm.
  • the profile thread is formed as a double thread. This further increases the removing rate, with which the drilling dust is removed, which rate is substantially higher than with a single thread profile. Furthermore, the undercut surface, which the mortar mass engages, also increases twofold in comparison with a single thread profile.
  • a triple or multiple thread profile can be used.
  • the profile extends over the entire length of the anchor body.
  • the thread profile serves as holding means for a mortar mass and as load application means for, e.g., a nut. This permits to avoid the use of a separate thread for forming the load application means.
  • FIGURE of the drawings shows a longitudinal, partially cross-sectional view of a tubular anchor according to the present invention.
  • a tubular anchor according to the present invention which is shown in the drawing, has a hollow tubular anchor body 1 provided on its outer surface, at least partially, with a thread-like profile 2 .
  • the thread-like profile 2 is formed as a trapezoidal thread with a crest region 3 and a root region 4 extending both parallel to the longitudinal axis of the anchor body 1 .
  • Each root region 4 is connected with two adjacent crest regions 3 by respective flanks.
  • the length of each of the crest region 3 and the root region 4 which is measured in the axial direction, corresponds approximately to 0.04-0.1 of the diameter d of the anchor body.
  • the inclination angle ⁇ of each flank with respect to the axial direction amounts approximately to 10°-45°.
  • the thread is formed as a double thread with a pitch of about 15 mm.
  • the thread extends over the entire length of the anchor body 1 and functions as retaining means for a mortar mass, on one hand, and as load application means for, e.g., a nut, on the other hand.
  • the height h of the thread measured in a direction transverse to the axial direction corresponds approximately to 0.25-0.75 of the thickness of the anchor body wall.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Piles And Underground Anchors (AREA)
  • Joining Of Building Structures In Genera (AREA)
  • Dowels (AREA)
US09/829,284 2000-04-10 2001-04-09 Tubular anchor Abandoned US20020046535A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10017761A DE10017761B4 (de) 2000-04-10 2000-04-10 Verwendung eines Rohrankers mit Profilierung
DE10017761.1 2000-04-10

Publications (1)

Publication Number Publication Date
US20020046535A1 true US20020046535A1 (en) 2002-04-25

Family

ID=7638218

Family Applications (1)

Application Number Title Priority Date Filing Date
US09/829,284 Abandoned US20020046535A1 (en) 2000-04-10 2001-04-09 Tubular anchor

Country Status (8)

Country Link
US (1) US20020046535A1 (de)
JP (1) JP2001349197A (de)
CN (1) CN1317627A (de)
AU (1) AU2644601A (de)
CA (1) CA2340356A1 (de)
DE (1) DE10017761B4 (de)
PL (1) PL194114B1 (de)
ZA (1) ZA200102834B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100202838A1 (en) * 2007-08-31 2010-08-12 Steven Weaver Rock bolt
EP2256292A2 (de) * 2009-05-26 2010-12-01 HILTI Aktiengesellschaft Befestigungselement mit einem Grundkörper für den Einsatz im Berg- und Tunnelbau

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102094660B (zh) * 2010-12-24 2013-06-05 西安科技大学 大倾角煤层长壁开采区段巷道整体高强度柔性支护方法
CN103541749B (zh) * 2013-10-25 2016-03-02 安徽恒源煤电股份有限公司祁东煤矿 掘进迎头片帮防护装置及掘进工作面迎头封闭的方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3806128A1 (de) * 1988-02-26 1989-09-07 Ischebeck Friedrich Gmbh Bohr-injektionsanker
DE4128154C2 (de) * 1991-07-02 1994-06-16 Gd Anker Gmbh & Co Kg Injektionsrohr und Verfahren zum Setzen eines Gebirgsankers
DE4209265A1 (de) * 1991-12-21 1993-06-24 Dyckerhoff & Widmann Ag Vorrichtung zur verankerung eines stabfoermigen zugglieds aus faserverbundwerkstoff
DE4314594C2 (de) * 1993-05-04 1995-05-11 Reinhold Oettl Verbundanker
DE29501638U1 (de) * 1995-02-02 1996-05-30 Friedr. Ischebeck Gmbh, 58256 Ennepetal Injektionsanker

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100202838A1 (en) * 2007-08-31 2010-08-12 Steven Weaver Rock bolt
US8851802B2 (en) * 2007-08-31 2014-10-07 Sandvik Intellectual Property Ab Rock bolt
EP2256292A2 (de) * 2009-05-26 2010-12-01 HILTI Aktiengesellschaft Befestigungselement mit einem Grundkörper für den Einsatz im Berg- und Tunnelbau

Also Published As

Publication number Publication date
DE10017761A1 (de) 2001-10-11
JP2001349197A (ja) 2001-12-21
PL194114B1 (pl) 2007-04-30
CA2340356A1 (en) 2001-10-10
CN1317627A (zh) 2001-10-17
PL346958A1 (en) 2001-10-22
DE10017761B4 (de) 2013-03-28
AU2644601A (en) 2001-10-11
ZA200102834B (en) 2001-10-08

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Legal Events

Date Code Title Description
AS Assignment

Owner name: HILTI AKITIENGESELLSCHAFT, LIECHTENSTEIN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:LUDWING, WOLFGANG;LIEBHARD, ERICH;REEL/FRAME:011732/0149

Effective date: 20010314

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION