EP0014512B1 - Method of installing a ground anchor - Google Patents

Method of installing a ground anchor Download PDF

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Publication number
EP0014512B1
EP0014512B1 EP80200113A EP80200113A EP0014512B1 EP 0014512 B1 EP0014512 B1 EP 0014512B1 EP 80200113 A EP80200113 A EP 80200113A EP 80200113 A EP80200113 A EP 80200113A EP 0014512 B1 EP0014512 B1 EP 0014512B1
Authority
EP
European Patent Office
Prior art keywords
ground
shank
anchor
blade
surrounding
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.)
Expired
Application number
EP80200113A
Other languages
German (de)
French (fr)
Other versions
EP0014512A2 (en
EP0014512A3 (en
Inventor
Marie Stolk
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to AT80200113T priority Critical patent/ATE1866T1/en
Publication of EP0014512A2 publication Critical patent/EP0014512A2/en
Publication of EP0014512A3 publication Critical patent/EP0014512A3/en
Application granted granted Critical
Publication of EP0014512B1 publication Critical patent/EP0014512B1/en
Expired legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/74—Means for anchoring structural elements or bulkheads
    • E02D5/80—Ground anchors
    • E02D5/801—Ground anchors driven by screwing

Definitions

  • the invention relates to a method of installing a ground anchor comprising screwing into the ground an anchor having a shank and at least one helical blade on the outside of the shank and injecting a hardening fluid into the ground surrounding the blade through bores provided in the shank and communicating with an interior passage of the shank.
  • Such a ground anchor as described for example, in GB-A-1,115,796 is employed for many purposes, for example, for fixing or anchoring dam walls along channels and rivers, for anchoring high masts, air halls and the like.
  • Such anchors screwed into the ground generally have satisfactory effect, the force that can be exerted on such anchors always strongly depends upon the conditions of the ground into which the anchor is screwed. During drilling operations it has been found, in practice that even at small intervals appreciable differences in the solidity of the ground can be assessed.
  • the invention has for its object to provide a method of the kind set forth by which the ground anchor can be installed in a simple manner such that a satisfactory ground condition is safeguarded so that optimum fixation of the ground anchor in the ground is invariably obtained.
  • this can be achieved in that prior to injecting the hardening fluid air or gas is passed through the interior passage and bores of the shank and injected into the ground surrounding the blade to drive out water contained in the ground.
  • the air or the gas will drive out any water contained in the soil surrounding the ground anchor so that the subsequently injected fluid can penetrate into the surrounding soil over a large distance away from the ground anchor without mixing with water.
  • an effective consolidation of the soil around the ground anchor and an effective fixation of the ground anchor are obtained.
  • Hardening fluids solidifying within a comparatively short time after injection into the ground are known, for example, from DE-A-2,819,974 and 2,820,963.
  • the ground anchor illustrated in the Figure comprises a hollow shank 1 surrounded over part of its circumference in known manner by a helical blade 2.
  • the hollow shank 1 has at both ends inner screwthread 3 and 4 respectively.
  • a correspondingly screwthreaded end 5 of a closing piece 6 for the shank is screwed Into the lower end of the shank with the screwthread 4 a correspondingly screwthreaded end 5 of a closing piece 6 for the shank.
  • the closing piece 6 has a bevelled tip 7.
  • the lower end of the shank may be closed in a different manner, for example, by welding the closing piece 6 to the shank or, for example by flattening and/or sealing by welding the lower end of the shank 1.
  • the top end of the shank is surrounded by a rectangular or square block 8 having a bore for receiving the top end of the shank.
  • the block 8 is welded to the top end of the shank.
  • the block 8 may be used for mounting a tool for screwing the anchor into the ground.
  • the Figure shows furthermore that near the blade at least one more or less radially extending bore is provided in the wall of the shank 1 so that the passage 9 in the interior of the shank communicates with the exterior of the ground anchor through said more or less radial bore 10.
  • a plurality of such bores will be provided along the length and the circumference of the shank.
  • a hose or the like can be connected with the open top end of the passage so that with the aid of a pump or the like air or gas can first be injected through the passage 9 and the bore(s) 10 into the ground surrounding the anchor.
  • the introduced air will drive away the water contained in the ground surrounding the ground anchor.
  • a hardening fluid can be injected through the passage 9 and the bore(s) 10 into the ground surrounding the ground anchor.
  • the composition of the hardening fluid employed is such that after a comparatively short time this fluid will solidify in the ground so that the ground surrounding the anchor is consolidated.
  • the pressure of the air or the gas in the passage of the ground anchor will preferably be maintained during the change-over from the injection of air or gas to the injection of the hardening fluid.
  • the blade 2 may, of course, be designed so that it extends through more than 360° around the shank.
  • the shank may be provided with a plurality of blades overlapping one another in the direction of length of the shank.
  • the injection can be carried out beneath and above the lower and upper blades respectively by providing suitable bores 10 in the shank.

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Piles And Underground Anchors (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)

Abstract

A method of arranging a ground anchor in the ground, said anchor comprising a shank and at least one helically extending blade on the outer side of said shank, the shank with the blade being screwed into the ground wherein after the ground anchor is screwed into the ground, air or gas is first injected into the ground surrounding the blade, after which a hardening fluid is injected.

Description

  • The invention relates to a method of installing a ground anchor comprising screwing into the ground an anchor having a shank and at least one helical blade on the outside of the shank and injecting a hardening fluid into the ground surrounding the blade through bores provided in the shank and communicating with an interior passage of the shank.
  • Such a ground anchor as described for example, in GB-A-1,115,796 is employed for many purposes, for example, for fixing or anchoring dam walls along channels and rivers, for anchoring high masts, air halls and the like. Although such anchors screwed into the ground generally have satisfactory effect, the force that can be exerted on such anchors always strongly depends upon the conditions of the ground into which the anchor is screwed. During drilling operations it has been found, in practice that even at small intervals appreciable differences in the solidity of the ground can be assessed.
  • From GB-A-1,115,796 it is known to consolidate the ground surrounding a helical ground anchor by injecting a hardening material inte the ground. However in using said method the hardening material will be mixed with the water contained in the soil surrounding the ground anchor whereby the properties of the hardening materials can be affected in a disadvantageous way so that the aimed fixing of the anchor in the ground will not be obtained.
  • The invention has for its object to provide a method of the kind set forth by which the ground anchor can be installed in a simple manner such that a satisfactory ground condition is safeguarded so that optimum fixation of the ground anchor in the ground is invariably obtained.
  • According the invention this can be achieved in that prior to injecting the hardening fluid air or gas is passed through the interior passage and bores of the shank and injected into the ground surrounding the blade to drive out water contained in the ground.
  • The air or the gas will drive out any water contained in the soil surrounding the ground anchor so that the subsequently injected fluid can penetrate into the surrounding soil over a large distance away from the ground anchor without mixing with water. As a result an effective consolidation of the soil around the ground anchor and an effective fixation of the ground anchor are obtained.
  • Hardening fluids solidifying within a comparatively short time after injection into the ground are known, for example, from DE-A-2,819,974 and 2,820,963.
  • It is noted that from DE-C-228.921 there is known a method for consolidating the ground whereby a cement body is exploded in a bore hole in the ground whereafter a mixture of sand and cement is injected in the holes formed by said explosion.
  • However such an explosion will disturb the ground surrounding the bore hole which is again disadvantageous for obtaining a consolidation of the ground. Also for installing a ground anchor it is undesirable to make first a hole in the ground and to install the ground anchor in said hole.
  • The invention will be described more fully hereinafter with reference to an embodiment of the ground anchor in accordance with the invention shown schematically in the accompanying Figure.
  • The ground anchor illustrated in the Figure comprises a hollow shank 1 surrounded over part of its circumference in known manner by a helical blade 2. In the embodiment shown the hollow shank 1 has at both ends inner screwthread 3 and 4 respectively. Into the lower end of the shank with the screwthread 4 is screwed a correspondingly screwthreaded end 5 of a closing piece 6 for the shank. The closing piece 6 has a bevelled tip 7. Obviously, the lower end of the shank may be closed in a different manner, for example, by welding the closing piece 6 to the shank or, for example by flattening and/or sealing by welding the lower end of the shank 1.
  • 'The top end of the shank is surrounded by a rectangular or square block 8 having a bore for receiving the top end of the shank. The block 8 is welded to the top end of the shank. The block 8 may be used for mounting a tool for screwing the anchor into the ground.
  • The Figure shows furthermore that near the blade at least one more or less radially extending bore is provided in the wall of the shank 1 so that the passage 9 in the interior of the shank communicates with the exterior of the ground anchor through said more or less radial bore 10.
  • In general, a plurality of such bores will be provided along the length and the circumference of the shank.
  • After the anchor shown in the Figure is screwed into the ground in a manner known per se, a hose or the like can be connected with the open top end of the passage so that with the aid of a pump or the like air or gas can first be injected through the passage 9 and the bore(s) 10 into the ground surrounding the anchor. The introduced air will drive away the water contained in the ground surrounding the ground anchor. Subsequently with the aid of a pump or by means of pressurized air or the like a hardening fluid can be injected through the passage 9 and the bore(s) 10 into the ground surrounding the ground anchor. The composition of the hardening fluid employed is such that after a comparatively short time this fluid will solidify in the ground so that the ground surrounding the anchor is consolidated. By using a comparatively thin-liquid hardening fluid all cracks set free of any ground water in the ground surrounding the anchor will be effectively filled with this fluid so that a particularly effective consolidation of the ground surrounding the anchor is obtained. This has a positive effect on the magnitude of the force that can be absorbed by the anchor, when after the solidification of the fluid the materials to be supported by the anchor are coupled with the top end of the shank of the anchor remaining in the ground.
  • It has been found that by supplanting the ground water the soil surrounding the ground anchor prior to the injection of the fluid an improved penetration of the hardening fluid in the ground is obtained.
  • After the introduction of air or gas into the ground surrounding the anchor the pressure of the air or the gas in the passage of the ground anchor will preferably be maintained during the change-over from the injection of air or gas to the injection of the hardening fluid.
  • It will be obvious that further developments and/or modifications of the embodiment described above are possible. For example, it will be preferred to provide bores 10 beneath and above the blade 2 in order to obtain consolidation of the ground both beneath and above the blade, which is particularly important when in use the anchor may be exposed both to tensile and pressing forces.
  • The blade 2 may, of course, be designed so that it extends through more than 360° around the shank.
  • As an alternative, the shank may be provided with a plurality of blades overlapping one another in the direction of length of the shank.
  • By injecting fluid between the overlapping parts of the blades, the ground located between said blades will be solidified, which is advantageous for withstanding both tensile and pressing forces.
  • Also in this case the injection can be carried out beneath and above the lower and upper blades respectively by providing suitable bores 10 in the shank.

Claims (1)

  1. A method of installing a ground anchor comprising screwing into the ground an anchor having a shank (1) and at least one helical blade (2) on the outside of the shank and injecting a hardening fluid into the ground surrounding the blade through bores (10) provided in the shank and communicating with an interior passage (9) of the shank characterised in that prior to injecting the hardening fluid air or gas is passed through the interior passage (9) and bores (10) of the shank and injected into the ground surrounding the blade to drive out water contained in the ground.
EP80200113A 1979-02-13 1980-02-11 Method of installing a ground anchor Expired EP0014512B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80200113T ATE1866T1 (en) 1979-02-13 1980-02-11 PROCEDURE FOR PLACING A GROUND ANCHOR IN THE GROUND.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL7901116 1979-02-13
NL7901116A NL7901116A (en) 1979-02-13 1979-02-13 METHOD FOR GROUNDING AN GROUND ANCHOR AND GROUND ANCHOR INTENDED FOR CARRYING OUT THIS METHOD

Publications (3)

Publication Number Publication Date
EP0014512A2 EP0014512A2 (en) 1980-08-20
EP0014512A3 EP0014512A3 (en) 1980-09-03
EP0014512B1 true EP0014512B1 (en) 1982-11-24

Family

ID=19832625

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80200113A Expired EP0014512B1 (en) 1979-02-13 1980-02-11 Method of installing a ground anchor

Country Status (4)

Country Link
EP (1) EP0014512B1 (en)
AT (1) ATE1866T1 (en)
DE (1) DE3061118D1 (en)
NL (1) NL7901116A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0155119A2 (en) * 1984-02-27 1985-09-18 Multilift Limited Container and lifting mechanism
GB2160237A (en) * 1984-05-25 1985-12-18 Bennett Walter Ground engaging member
NL1004746C2 (en) * 1996-12-11 1998-06-15 Van Leeuwen Harmelen Bv Geb Method for harvesting resp. moving trees.
US6058662A (en) * 1997-07-18 2000-05-09 Secure Products, Llc Earth anchors and methods for their use
DE102013105859A1 (en) 2013-06-06 2014-12-11 SG Holding UG (haftungsbeschränkt) A soil-hardening substance for permanent fixation of a ground anchor or ground anchor and a method for introducing the same

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL192836C (en) * 1984-10-17 2000-02-18 Leeuwen Marinus Teunis Van Screw anchor.
DE4424339C2 (en) * 1994-07-11 1999-02-11 Arthur Keck Ground anchor
CZ304086B6 (en) * 2011-12-22 2013-10-09 Vysoká Skola Bánská Technická - Univerzita Ostrava Means for grouting with integrated feeding of grouting medium and air bleeding
DE102013104773A1 (en) 2013-05-08 2014-11-13 Jörg Pagels ground anchor

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2603319A (en) * 1952-07-15 Ground anchor v
DE228921C (en) *
FR1306492A (en) * 1961-11-20 1962-10-13 S R L E L S E Edilizia Lavori Process for obtaining the stabilization and consolidation of subsoil soils, and the corresponding perforator-mixer tool
GB1115796A (en) * 1965-04-06 1968-05-29 Bauer Karl Heinz Improvements in and relating to ground anchors and methods of making such anchors
DE2334418A1 (en) * 1973-07-06 1975-01-23 Stelag Konstruktion Soil anchor for support walls and buildings - consists of steel tube with ram point and spiral plate type holder

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0155119A2 (en) * 1984-02-27 1985-09-18 Multilift Limited Container and lifting mechanism
EP0155119A3 (en) * 1984-02-27 1986-07-30 Multilift Limited Method and arrangement for lifting containers onto vehicles
GB2160237A (en) * 1984-05-25 1985-12-18 Bennett Walter Ground engaging member
NL1004746C2 (en) * 1996-12-11 1998-06-15 Van Leeuwen Harmelen Bv Geb Method for harvesting resp. moving trees.
EP0847688A1 (en) * 1996-12-11 1998-06-17 Gebr. van Leeuwen Harmelen B.V. A method of uprooting or displacing trees
US6058662A (en) * 1997-07-18 2000-05-09 Secure Products, Llc Earth anchors and methods for their use
DE102013105859A1 (en) 2013-06-06 2014-12-11 SG Holding UG (haftungsbeschränkt) A soil-hardening substance for permanent fixation of a ground anchor or ground anchor and a method for introducing the same
WO2014194893A2 (en) 2013-06-06 2014-12-11 Harald Göttlich A substance, which can be cured in the earth, for permanent fastening an earth anchor or ground anchor and a method for insertion thereof

Also Published As

Publication number Publication date
DE3061118D1 (en) 1982-12-30
NL7901116A (en) 1980-08-15
EP0014512A2 (en) 1980-08-20
ATE1866T1 (en) 1982-12-15
EP0014512A3 (en) 1980-09-03

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