WO2011001297A1 - Procédé pour construire une colonne - Google Patents

Procédé pour construire une colonne Download PDF

Info

Publication number
WO2011001297A1
WO2011001297A1 PCT/IB2010/051006 IB2010051006W WO2011001297A1 WO 2011001297 A1 WO2011001297 A1 WO 2011001297A1 IB 2010051006 W IB2010051006 W IB 2010051006W WO 2011001297 A1 WO2011001297 A1 WO 2011001297A1
Authority
WO
WIPO (PCT)
Prior art keywords
soil
particulate material
driving formation
weight
particulate
Prior art date
Application number
PCT/IB2010/051006
Other languages
English (en)
Inventor
Jacobus Christiaan Daniel Theron
Abram Compion
Original Assignee
Russet Trading & Investment 24 (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 Russet Trading & Investment 24 (Pty) Ltd filed Critical Russet Trading & Investment 24 (Pty) Ltd
Publication of WO2011001297A1 publication Critical patent/WO2011001297A1/fr

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/02—Improving by compacting
    • E02D3/08—Improving by compacting by inserting stones or lost bodies, e.g. compaction piles
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
    • E02D7/02—Placing by driving
    • E02D7/06—Power-driven drivers
    • E02D7/08—Drop drivers with free-falling hammer

Definitions

  • This invention relates to a method of constructing a compacted stone or granular column.
  • the invention relates to a method of constructing a stone or granular column in a soil mass for purposes of, including without limitation, increasing soil stability, providing vertical drainage and generally increasing the load bearing capacity of the soil.
  • any reference to soil in this specification shall be sufficiently broadly interpreted to include rock, clay, sand, alluvial soil and any body consisting of layers of mineral constituents of variable thicknesses.
  • a method for constructing a compacted column in a mass of soil including the steps of: Compacting particulate material into the soil by imparting vertical force onto a driving formation in a number of controlled, rapidly successive blows while the driving formation remains in constant contact with the particulate and whereby a generally elongate cavity is defined in the soil above the compacted particulate material; back-filling the elongate cavity with particulate material; repeating the steps of back-filling and compacting the particulate material into the soil until the particulate material has been driven to a predetermined depth thereby defining a column within the soil.
  • an initial elongate cavity may be formed in the soil which may be back-filled with particulate material to be compacted into the soil.
  • the depth of the cavity may be in the region of 1 metre.
  • the driving formation may comprise a solid, substantially elongate foot member.
  • the foot member preferably has a diameter of approximately 1 meter.
  • Vertical force may be applied to the driving formation by causing a predetermined weight to be dropped repeatedly onto the driving formation from a predetermined height.
  • the predetermined weight may be in the order of between 2 to 30 tons and may be dropped from a predetermined height of approximately 1.5 meters.
  • the driving formation and weight may be mounted onto a front end of a track- mounted rapid impact compactor machine and wherein the weight is vertically displaceable relative to the driving formation.
  • displacement of the weight may be controlled by means of a hydraulic system for raising and dropping the weight relative to the driving formation.
  • the blows may be imparted to the driving formation at a rate of succession in the range of 40 to 60 blows per minute.
  • the particulate may be driven to a maximum depth in the order of 6 metres.
  • the steps of back-filling and compacting may be repeated between 8 and 10 times before the maximum depth is achieved.
  • Figures 1 to 3 are sectional side views showing the first step of the method of the invention of creating a cavity in soil by repeatedly dropping a weight onto a driving formation wherein the weight and driving formation are included on a rapid impact compactor machine;
  • Figure 4 is a sectional side view showing the cavity of the first step back-filled with particulate
  • Figure 5 is a fragmentary sectional side view showing the compacting of the particulate in accordance with the method of the invention
  • Figure 6 is a sectional side view showing the redefinition of the cavity after the compacting of the particulate
  • Figure 7 is a fragmentary sectional side view showing the steps of back-filling and compacting the particulate into the redefined cavity using a rapid impact compactor machine;
  • Figure 8 is a sectional side view showing the increase in depth of the cavity as a result of repetitive back-filling and compacting in accordance with the method of the invention.
  • Figure 9 is a sectional side view of a column formed in the soil in
  • the invention provides for a method of constructing a stone or granular column in a deposit of soil.
  • Stone or granular columns may be installed in soil for a number of reasons, including without limitation the stabilisation of soil having insufficient load bearing capacity to withstand the load of a structure or super structure, the prevention of liquefaction of the soil by improving drainage and for the purpose of improving the equivalent stiffness of a soil mass.
  • Soil deposits having insufficient load bearing capacity would include soil having high water content, loose soil or those comprised of different soil types which causes differential settlement of the soil over time.
  • the method of the invention includes the general steps of compacting particulate material 10 into the soil 12 by imparting vertical force onto a driving formation 14 in a number of controlled, rapidly successive blows and whereby a generally elongate cavity 16 is defined in the soil above the compacted particulate material; back-filling the elongate cavity with particulate material; and repeating the steps of back-filling and compacting the particulate material into the soil until the particulate material has been driven to a predetermined depth thereby defining a column 18 within the soil.
  • the soil composition is unstable, for example in soft or wet sands or clay, it may be necessary to create an initial elongate cavity 16 in the upper layer of the soil which may be comprised of rock.
  • the cavity is back-filled with particulate material which is supported within the cavity to define a plug formation (as shown in Figure 4).
  • the plug formation serves as a seat with which the driving formation 14 can make contact in order to prevent it from becoming lodged in the weaker soil.
  • Figures 1 to 3 illustrate the first step of forming the initial cavity using dynamic compaction equipment.
  • a weight 20 of about 12 tons is suspended from a crane 22 and is allowed to free-fall onto the targeted area. Through this procedure, a cavity of approximately 1 metre in depth is formed.
  • the particulate is then back-filled with particulate material to define the plug formation (shown in Figure 4). It will not always be necessary to commence the installation process by forming an initial cavity. In circumstances where the soil is sufficiently dense or stable, the particulate material will simply be placed on the targeted position of the intended column on top of the soil from where it will be driven directly into the soil.
  • the particulate generally comprises crushed stone having a crushing strength of around 100 Megapascals (MPa).
  • the rapid impact compaction machine comprises a track-mounted portion to which is mounted a driving formation 14 and a weight 26.
  • the driving formation comprises a substantially solid, elongate foot of about 1 metre in diameter which remains in constant contact with the particulate material during the installation process.
  • the weight which may typically be around 12 tons but not necessarily so, is suspended from a height of approximately 1.5 metres and is allowed to free fall onto the foot after which it is pulled back to its suspended position by a hydraulic mechanism.
  • the weight is dropped onto the foot in a series of controlled, rapidly successive blows which are delivered at a rate of about 40 to 60 blows per minute.
  • the relatively short vertical path of travel of the weight between an uppermost point from which it is dropped and a lowermost point where it impacts the foot has the effect of increasing the accuracy and consistency with which the weight strikes the foot.
  • the relatively high degree of accuracy presents an improvement over prior art methods which generally involve hoisting a similar weight using a cable into the air to a height of about 18 metre and allowing the weight to free fall directly onto the particulate material to be driven into the soil.
  • factors like wind and cable stretching or twisting can affect the accuracy and consistency with which the weight is able to impact its target.
  • the particulate material is driven to a depth of in the region of 1.35 metres, as illustrated in Figures 5 and 6.
  • the process of driving the particulate material into the soil results in the definition of a cavity above the compacted particulate material.
  • the cavity is again filled with particulate material and again compacted and driven into the soil as deeply as possible in order to partially redefine the cavity.
  • the process of compacting and driving the particulate material is repeated until a point of refusal is achieved.
  • the point of refusal is the maximum depth to which the particulate material can be driven before the soil refuses to accept further penetration.
  • the maximum depth achievable is in the region of 6 metres after the process of back-filling and compacting has been repeated roughly 6 to 8 times, wherein in each repetition is generally referred to as a pass.
  • the particulate that has been compacted into the soil within the cavity defines a granular column 18 extending through the soil, as shown in Figure 9 of the drawings.
  • the invention provides for an efficient method of installing columns in soil utilizing rapid impact compaction technology and it is envisaged by the inventors that the time taken to construct a single column ranges between 10 and 15 minutes which has the result that approximately 60 columns may be constructed per average day.
  • Prior art dynamic compaction methods of installation which may involve dropping a weight from a crane or similar other structure are slower as a result of the necessity to safely anchor the machinery and the fact that the weight must be repeatedly hoisted a substantial distance into the air between successive blows.
  • the rapid impact compaction machine with its track-mounted carrier is highly mobile and is, furthermore, able to operate in built up areas between buildings relatively safely as a result of the control and accuracy which may be exercised in the hoisting and dropping of the weight onto the foot from a substantially lower height with and with consistent accuracy.
  • prior art methods which involve penetrating a tube into the soil through which to introduce particulate causes mixing of the native soil into the particulate and may have the effect of contaminating and, thus, weakening the resulting column.
  • the method of the invention eliminates the need for the use of tubes or other casings to be penetrated into the soil and, accordingly, reduces the risk of contamination of the soil.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Structural Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Agronomy & Crop Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Soil Sciences (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)

Abstract

L'invention porte sur un procédé pour construire une colonne compactée dans une masse de sol, lequel procédé comprend les étapes consistant à : compacter un matériau particulaire (10) dans le sol (12) en communiquant une force verticale sur une formation d'enfoncement (14) en un certain nombre de coups successifs rapides et commandés tandis que la formation d'enfoncement reste en contact constant avec la matière particulaire (10), ce par quoi une cavité globalement allongée (16) est définie dans le sol au-dessus du matériau compacté ; remplir la cavité allongée par un matériau particulaire et répéter les étapes de remplissage et de compactage des particules dans le sol jusqu'à ce que le matériau ait été enfoncé à une profondeur prédéterminée, de façon à définir ainsi une colonne (18) à l'intérieur du sol.
PCT/IB2010/051006 2009-06-30 2010-03-09 Procédé pour construire une colonne WO2011001297A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA2009/04581 2009-06-30
ZA200904581 2009-06-30

Publications (1)

Publication Number Publication Date
WO2011001297A1 true WO2011001297A1 (fr) 2011-01-06

Family

ID=42174626

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2010/051006 WO2011001297A1 (fr) 2009-06-30 2010-03-09 Procédé pour construire une colonne

Country Status (1)

Country Link
WO (1) WO2011001297A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014531215A (ja) * 2011-10-05 2014-11-27 エフ．ホフマン−ラ ロシュ アーゲーＦ． Ｈｏｆｆｍａｎｎ−Ｌａ Ｒｏｃｈｅ Ａｋｔｉｅｎｇｅｓｅｌｌｓｃｈａｆｔ 抗体ｇ１グリコフォーム産生のための方法
WO2017147424A1 (fr) * 2016-02-24 2017-08-31 Ingios Geotechnics, Inc. Systèmes et procédés d'obtention de concavités comprimées et remplies d'agrégat en vue d'améliorer la rigidité et l'uniformité du sol
US12031287B2 (en) 2021-08-10 2024-07-09 Ingios Geotechnics, Inc. Systems and methods to provide pressed and aggregate filled concavities for improving ground stiffness and uniformity

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5249892A (en) * 1991-03-20 1993-10-05 Fox Nathaniel S Short aggregate piers and method and apparatus for producing same
EP1234916A2 (fr) * 2001-02-22 2002-08-28 KELLER GRUNDBAU GmbH Méthode pour construire des colonnes
EP1382750A1 (fr) * 2002-07-18 2004-01-21 Roxbury Limited Procédé de compaction du sol
JP2006016860A (ja) * 2004-07-02 2006-01-19 Gosei Kogyo:Kk 地盤の改良方法と、それに使用するスクリュードリルと転圧パイプ

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5249892A (en) * 1991-03-20 1993-10-05 Fox Nathaniel S Short aggregate piers and method and apparatus for producing same
EP1234916A2 (fr) * 2001-02-22 2002-08-28 KELLER GRUNDBAU GmbH Méthode pour construire des colonnes
EP1382750A1 (fr) * 2002-07-18 2004-01-21 Roxbury Limited Procédé de compaction du sol
JP2006016860A (ja) * 2004-07-02 2006-01-19 Gosei Kogyo:Kk 地盤の改良方法と、それに使用するスクリュードリルと転圧パイプ

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014531215A (ja) * 2011-10-05 2014-11-27 エフ．ホフマン−ラ ロシュ アーゲーＦ． Ｈｏｆｆｍａｎｎ−Ｌａ Ｒｏｃｈｅ Ａｋｔｉｅｎｇｅｓｅｌｌｓｃｈａｆｔ 抗体ｇ１グリコフォーム産生のための方法
WO2017147424A1 (fr) * 2016-02-24 2017-08-31 Ingios Geotechnics, Inc. Systèmes et procédés d'obtention de concavités comprimées et remplies d'agrégat en vue d'améliorer la rigidité et l'uniformité du sol
US10196793B2 (en) 2016-02-24 2019-02-05 Ingios Geotechnics, Inc. Systems and methods to provide pressed and aggregate filled concavities for improving ground stiffness and uniformity
US20190136478A1 (en) * 2016-02-24 2019-05-09 Ingios Geotechnics, Inc. Systems and methods to provide pressed and aggregate filled concavities for improving ground stiffness and uniformity
US11085160B2 (en) 2016-02-24 2021-08-10 Ingios Geotechnics, Inc. Method to provide pressed and aggregate filled concavities for improving ground stiffness and uniformity
US12031287B2 (en) 2021-08-10 2024-07-09 Ingios Geotechnics, Inc. Systems and methods to provide pressed and aggregate filled concavities for improving ground stiffness and uniformity

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