EP0117690A1 - Procédé pour l'ancrage d'une ancre dans un trou de forage - Google Patents

Procédé pour l'ancrage d'une ancre dans un trou de forage Download PDF

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Publication number
EP0117690A1
EP0117690A1 EP84301042A EP84301042A EP0117690A1 EP 0117690 A1 EP0117690 A1 EP 0117690A1 EP 84301042 A EP84301042 A EP 84301042A EP 84301042 A EP84301042 A EP 84301042A EP 0117690 A1 EP0117690 A1 EP 0117690A1
Authority
EP
European Patent Office
Prior art keywords
hole
columns
fluent material
grout
masses
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.)
Withdrawn
Application number
EP84301042A
Other languages
German (de)
English (en)
Inventor
Walter John Simmons
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.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and Co
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 EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Publication of EP0117690A1 publication Critical patent/EP0117690A1/fr
Withdrawn legal-status Critical Current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
    • E21D20/00—Setting anchoring-bolts
    • E21D20/02—Setting anchoring-bolts with provisions for grouting

Definitions

  • the present invention relates to a method of anchoring a reinforcing member in a hole, e.g., a rock bolt in a hole in a mine roof, and, more particularly, to a method wherein a grouting composition is introduced into a hole in uncartridged form and allowed to harden around a bolt subsequently embedded therein.
  • the types of bolt systems that have been used for mine roof support include tensioned mechanical steel bolts and resin-anchored bolts.
  • a cured resin is used to anchor the bolt to the surrounding strata, preferably over the entire length of the bolt.
  • Cartridges containing a polymerizable resin formulation and, separated therefrom, a catalyst which catalyzes the curing of the resin are introduced into a hole, and are penetrated and ruptured by the bolt, whereupon the package contents are mixed by rotation of the bolt.
  • the resin hardens around the bolt so as to anchor it in place.
  • inorganic cements to anchor rock bolts e.g., as described in U.S. Patent 4,126,005, also has been proposed. Cement grouts are less expensive than resin grouts while still providing the advantages of a grouted bolt.
  • This technique requires pumping the two components of the resin system through a mixer and into a bolting head assembly, which is moved into contact with the mine roof.
  • the hardening time of the mixture has to be long enough, and the pumping rate high enough, that the mixture does not harden in the bolting head assembly, thereby precluding its delivery into the hole in the mine roof, or in the hole, preventing bolt insertion.
  • the apparatus may be rendered nonfunctional owing to the hardening of the mixture therein as a result of a temporary failure of some part or the accumulation of residual mixture which has escaped the purging operation.
  • a plastic, settable, form-retaining material e.g., a mixture of an epoxy or polyester resin, a hardening agent, and a solid filler
  • a plastic, settable, form-retaining material e.g., a mixture of an epoxy or polyester resin, a hardening agent, and a solid filler
  • the tube contains a free-sliding imperforate piston which moves in advance of the plastic material as it is forced to flow through the tube by the pressure exerted on the annular piston when downward pressure is applied to the tube. After all of the material has been transferred to the tube, the latter is removed from the mixing vessel and annular piston, and inserted into a borehole, open end first.
  • the tube is withdrawn while pressure is applied to the free-sliding piston, whereby the plastic material is extruded into the hole.
  • the rockbolt is inserted in the column of plastic material.
  • the required assemblage of mixing vessel, transfer tube, and pistons, and the disengagement of the transfer tube from the mixing vessel, prior to the introduction of the filled tube in the hole are procedures which can result in protracted operations for the installation of bolts in numerous holes in a mine roof.
  • the technique involves the ever-present risk that the grout may harden prematurely and prevent bolt insertion, or at least make it difficult.
  • the bolt must be installed immediately after the grout or mortar has been introduced, so that it is not feasible with this method to fill a large number of holes with the grout first and subsequently to introduce the bolts, a more efficient procedure.
  • the present invention provides a method of anchoring a reinforcing member in a hole comprising
  • an uncartridged grout in position in a hole and ready to receive, and be mixed by, a reinforcing member, which is to be anchored in the hole by the hardening of the mixed grout.
  • the grout of the invention is in the form of multiple, and usually two, stable, minimally interpenetrated adjacent columns of fluent material at least one of which is of different composition from another, which columns have sufficient viscosity, or are adapted by some other means, to remain in position in a vertical, overhead hole, and at least two of the columns, when the columns are mixed with one another, being reactive with one another, or activated one by another.
  • the present method and product offer the economic advantage of uncartridged grout systems while at the same time overcoming the disadvantages of previous pumped systems wherein rapid-setting resin mixtures were introduced into holes.
  • the present uncartridged grout is stable after delivery to the hole and consequently places no tight time constraints on the placement of the bolt therein.
  • the multi-columnar grout is placed in a group of holes, and after all of the holes have been loaded, the bolts are installed therein. This is a more efficient procedure than the completion of one hole at a time.
  • the reactive components of a rock bolt grout e.g., a fluent composition containing a crosslinkable polymer and a fluent composition containing a catalyst which initiates the crosslinking polymerization of the polymer, are delivered into a hole as separate, unmixed masses, being deposited therein in a manner such that interpenetration or mixing of the masses is minimized. Mixing on a macro, or gross, scale is avoided, thereby keeping the area of the interface between the two masses to a minimum.
  • the present invention now offers the user of grouted rock bolts the economic advantage of a pumped grout, and the stability advantage of a cartridged grout before bolt installation. Because the grout is unmixed before bolt insertion, there is no risk of equipment breakdown due to the hardening of grout therein, and the grout pumping and bolt insertion operations can be carried out without the threat that a delay could result in the grout's becoming hardened before the bolt has been inserted.
  • 1 is a hole in a solid formation such as a mine roof 2, which is to be reinforced by means of grouted rock bolts.
  • the two reactive components of the grout e.g., a fluent material containing a crosslinkable polymer and a fluent material containing a catalyst which initiates the crosslinking polymerization of the polymer, are shown being pumped into hole 1 as a pair of discrete masses 3 and 4 which, in the hole, are in contact with one another along interface 5.
  • Masses 3 and 4 are pumped through a pair of filling hoses 6 and 7, respectively, which are united in their nozzle portions so as to become the dual chambers of a single hose.
  • Ring 8 made of a material such as poly(tetrafluoroethylene), is a guide member which keeps the hose centered in hole 1.
  • the hose is retracted, and masses 3 and 4 become two columns, best seen in FIG. 2.
  • the filling hose is removed from hole 1.
  • the fluent materials which form adjacent columns 3 and 4 are sufficiently viscous that they remain in position in hole 1, a vertical, overhead hole, without mechanical assistance. Suitable viscosities generally are in the range of about from 10,000 to 1,000,000 centipoises. If necessary, however, retention in hole I can be accomplished by end-capping the grout with a retaining means which either can be penetrated by the bolt or removed when the bolt is to be inserted.
  • FIG. 3 a rock bolt 9 has been pushed upward into the hole shown in FIG. 2 and rotated to mix masses 3 and 4. After mixing, the reactive components rapidly react to form a hardened grout 10, whereby bolt 9 is anchored to the surrounding rock.
  • interface 5 is shown as a line having some shallow interpenetrations between discrete masses 3 and 4. Such a small degree of interpenetration might result as the hose is retracted, for example.
  • the columns of fluent material which form the uncartridged grout of the invention comprise at least two separate components of a bolt-grouting composition, i.e., one of the columns contains a first reactive component and another column a component which reacts with, or activates, the first reactive component.
  • a first reactive component i.e., one of the columns contains a first reactive component and another column a component which reacts with, or activates, the first reactive component.
  • all of the ingredients of the grout will be present in the two inter-reactive columns, although additional columns may be used to introduce other ingredients if desired.
  • the reactive components of the grout e.g., a resin component and a catalyst component
  • the present invention can be used with any reactive grouting system which can be provided in an extrudable or pumpable form.
  • Typical of such systems are the two-component resin compositions described in U.S. Patents 3,324,662, 3,324,663, and 3,302,410, all granted to D. C. McLean, and the improved resin/catalyst system described in U.S. Patent 4,280,943, granted to J. R. Bivens et al.
  • Inorganic systems such as the cement/water system described in U.S. Patent 4,126,005, issued to D. L. Coursen, and the phosphate system described in U.S. Patent 4,174,227, issued to E. A. Tomic also are suitable for use in the present method.
  • the selected system will be formulated so as to provide the required ratios of components in the column diameters to be employed.
  • Grouting compositions having a resin component (A) and a catalyst component (B) in A/B percentage ratios of 40/60 to 60/40 were prepared as described in Example 2 of U.S. Patent 4,280,943.
  • Components (A) and (B) were pumped into 1.2-meter-and 0.6-meter-long, 2.5-cm-diameter steel pipes (simulated boreholes), whereby two adjacent columns of about equal diameter were formed therein, as shown in FIG. 2.
  • Bolts were inserted into the grouts at time intervals varying from 5 minutes to 48 hours after pumping. All bolts were inserted, and grouts mixed, with no difficulty, and pull strengths were satisfactory.

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)
EP84301042A 1983-02-18 1984-02-17 Procédé pour l'ancrage d'une ancre dans un trou de forage Withdrawn EP0117690A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US46782483A 1983-02-18 1983-02-18
US467824 1983-02-18

Publications (1)

Publication Number Publication Date
EP0117690A1 true EP0117690A1 (fr) 1984-09-05

Family

ID=23857331

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84301042A Withdrawn EP0117690A1 (fr) 1983-02-18 1984-02-17 Procédé pour l'ancrage d'une ancre dans un trou de forage

Country Status (3)

Country Link
EP (1) EP0117690A1 (fr)
AU (1) AU2457484A (fr)
ZW (1) ZW2784A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2016201180B2 (en) * 2016-02-25 2022-01-06 Metrik Properties Pty Ltd An injection system, method of manufacturing and dual conduit delivery tube for reducing resin intermixing during the manufacture of dual set time resin capsules

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA3023649C (fr) * 2015-03-03 2022-05-03 J-Lok Co. Resine pompable a deux composantes
RU2019109202A (ru) 2016-09-02 2020-10-02 Джей-ЛОК КО. Система поддающейся перекачке насосом смолы

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD90115A (fr) *
GB1312785A (en) * 1970-01-30 1973-04-04 Explosives & Chem Prod Resinous cartridges for securing fixing elements
GB1312904A (en) * 1971-02-16 1973-04-11 Strata Mining Patents Ltd Rock bolting
GB1380450A (en) * 1972-11-17 1975-01-15 Fosroc Ag Fixing
US4116368A (en) * 1976-12-16 1978-09-26 The United States Of America As Represented By The Secretary Of The Interior Clog-free inorganic grout emplacement gun
FR2418172A1 (fr) * 1978-02-22 1979-09-21 Celtite Sa Perfectionnements aux cartouches de scellement
DE2845107A1 (de) * 1978-10-17 1980-04-24 Fischer Artur Dr H C Verankerung eines befestigungselementes mittels einer klebemasse
DE7913376U1 (de) * 1980-10-23 Korte-Jungermann, Hans Werner, 4156 Willich Befestigungsanker
DE8201921U1 (de) * 1982-06-16 Kremo Werke Hermanns Gmbh & Co Kg, 4150 Krefeld Injektionsanker

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD90115A (fr) *
DE7913376U1 (de) * 1980-10-23 Korte-Jungermann, Hans Werner, 4156 Willich Befestigungsanker
DE8201921U1 (de) * 1982-06-16 Kremo Werke Hermanns Gmbh & Co Kg, 4150 Krefeld Injektionsanker
GB1312785A (en) * 1970-01-30 1973-04-04 Explosives & Chem Prod Resinous cartridges for securing fixing elements
GB1312904A (en) * 1971-02-16 1973-04-11 Strata Mining Patents Ltd Rock bolting
GB1380450A (en) * 1972-11-17 1975-01-15 Fosroc Ag Fixing
US4116368A (en) * 1976-12-16 1978-09-26 The United States Of America As Represented By The Secretary Of The Interior Clog-free inorganic grout emplacement gun
FR2418172A1 (fr) * 1978-02-22 1979-09-21 Celtite Sa Perfectionnements aux cartouches de scellement
DE2845107A1 (de) * 1978-10-17 1980-04-24 Fischer Artur Dr H C Verankerung eines befestigungselementes mittels einer klebemasse

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Patent Abstracts of Japan vol. 5, no. 128, 18 August 1981 & JP-A-56-62814 *
Patent Abstracts of Japan vol. 5, no. 67, 7 May 1981 & JP-A-56-16530 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2016201180B2 (en) * 2016-02-25 2022-01-06 Metrik Properties Pty Ltd An injection system, method of manufacturing and dual conduit delivery tube for reducing resin intermixing during the manufacture of dual set time resin capsules

Also Published As

Publication number Publication date
AU2457484A (en) 1984-08-23
ZW2784A1 (en) 1984-05-30

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Inventor name: SIMMONS, WALTER JOHN