EP2636797A1 - Verfahren zur Verfestigung eines Bodens - Google Patents

Verfahren zur Verfestigung eines Bodens Download PDF

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Publication number
EP2636797A1
EP2636797A1 EP13158224.9A EP13158224A EP2636797A1 EP 2636797 A1 EP2636797 A1 EP 2636797A1 EP 13158224 A EP13158224 A EP 13158224A EP 2636797 A1 EP2636797 A1 EP 2636797A1
Authority
EP
European Patent Office
Prior art keywords
pile
ground
consolidating
driving
helices
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Withdrawn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
EP13158224.9A
Other languages
English (en)
French (fr)
Inventor
Rodolfo KAUBER
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.)
Kappazeta SpA
Original Assignee
Kappazeta SpA
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 Kappazeta SpA filed Critical Kappazeta SpA
Publication of EP2636797A1 publication Critical patent/EP2636797A1/de
Withdrawn legal-status Critical Current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
    • E02D5/22—Piles
    • E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
    • E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D1/00—Investigation of foundation soil in situ
    • E02D1/02—Investigation of foundation soil in situ before construction work
    • E02D1/022—Investigation of foundation soil in situ before construction work by investigating mechanical properties of the soil
    • 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
    • E02D5/22—Piles
    • E02D5/56—Screw 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
    • E02D7/22—Placing by screwing down

Definitions

  • the present invention refers to a system for consolidating the ground by means of foundation piles.
  • the expression consolidation system is used to indicate both the consolidation method and the apparatus for implementing the method.
  • the expression bearing capacity is used both to indicate the resistance offered by the pile to the sinking of an overlying construction into the ground (compression pile) and the resistance offered by the pile to the hoisting of a construction which should be anchored to the ground (tension pile).
  • piles comprising groups of several turns arranged at a mutual distance.
  • each intervention may vary in terms number and sizes of the helices in relation to the characteristics of the subsoil present in the site.
  • the characteristics of the subsoil vary consistently forcing the designer of the helical piles to many variables and thus many possible combinations of length of the pile (as a function of the depth at which it is possible to reach the suitable litostrato) and the number/dimension of the helices to be extended over the unitary load fraction transmitted to the ground.
  • piling by means of helical piles occurs empirically, driving one or more sample piles into the area to be consolidated, and verifying the relative bearing capacity using the known systems.
  • the diameter of the pile is comprised between 75 mm and 150 mm
  • the diameter of the helices is comprised between 180 mm and 360 mm
  • the pitch of the helices is comprised between 50 mm and 120 mm
  • the number of the helices is comprised between 1 and 3
  • the distance between the helices is comprised between 5 and 15 times the pitch.
  • the present invention aims at overcoming the aforementioned drawbacks of the prior art in a simple and inexpensive manner.
  • the bearing capacity of the helical pile at any time during the driving thereof is related to the energy required for the driving thereof, assuming that the bearing capacity depends on the penetration energy, which in turn depends on the torque required to drive the pile into the ground.
  • the bearing capacity of the pile and driving torque is a constant marginally influenced by the type of the ground, and it can be obtained empirically providing reliable values for any type of intervention. It can also be obtained in a site far from the consolidation site.
  • the curve has the development expressed in Fig 5 .
  • the curves were constructed using usual pile driving tools, conveniently monitored, and equally usual test tools.
  • the invention provides for locally improving the quality of the ground adapting it to an ideal combination of the number and dimension of the helices and the depth of the pile.
  • the improvement of the geo-mechanical characteristics of the ground, located around each helix, between one helix and the other and below the deepest helix (for compression piles) or above the helix closest to the surface (for tension piles), over an ideal extension occurs by injecting consolidating fluids through the pile in proximity of the helices or in intermediate points between the helices.
  • the consolidating fluids are fluids based on cement, or inorganic or organic resins, possibly expanding resins well known in the field, possibly mixed with inert material and/or additives).
  • the consolidating mixture is injected through the pile, which may be conveniently modular, starting from the upper end thereof, and it reaches - from within the pile - the holes previously made along the trunk of the pile or at the helices and spreads around the holes.
  • Fig. 1 schematically shows a helical pile subjected to a tip load, and provided with means for the rotation thereof.
  • Fig. 2 shows the section II-II of Fig 1 .
  • Fig. 3 shows the section III-III of Fig 1 .
  • Fig. 4 shows the pile driven into the ground.
  • Fig. 5 is the curve comparing the relation between the capacity expressed in kilograms Kg and the torque expressed in kilogrameters Kg x m as a function of the diameter of the blade.
  • the figures show the consolidation pile 1 provided with two helices 2.
  • the pile in the illustrated example, has an outer diameter of 100 mm, while the diameter of the helices is equivalent to 240 mm, while the pitch of each helix is equivalent to 65 mm.
  • Each helix in the illustrated example, is wound for more than one turn.
  • the pile comprises injection holes 3 in proximity of the helices.
  • the pile is driven into the ground using self-propelling means 4 comprising a hoisting arm 41 provided - at the end - with means 42 for supporting the pile 1.
  • the means for supporting the pile include a hydraulic Motor 43 adapted to rotate the pile 1 around the axis thereof.
  • the hydraulic motor 43 comprises a manometer 44 adapted to indicate the motor actuation pressure, which is proportional to the driving torque transmitted to the pile.
  • the self-propelling means comprise means adapted to pump a consolidating liquid through the pile; these means are known and thus shall not be described in detail.
  • the invention operates as follows, and reflects the sequence of the method.
  • the driving torque required to provide the desired bearing capacity of the pile is identified by means of the diagram of Fig 5 .
  • the pile is then driven into the ground monitoring the driving torque.
  • the consolidating substances are injected, and the measuring of the torque is repeated until the desired value is reached.

Landscapes

  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • Soil Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Soil Working Implements (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
EP13158224.9A 2012-03-09 2013-03-07 Verfahren zur Verfestigung eines Bodens Withdrawn EP2636797A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000016A ITRE20120016A1 (it) 2012-03-09 2012-03-09 Metodo e dispositivo di consolidamento del terreno

Publications (1)

Publication Number Publication Date
EP2636797A1 true EP2636797A1 (de) 2013-09-11

Family

ID=46028077

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13158224.9A Withdrawn EP2636797A1 (de) 2012-03-09 2013-03-07 Verfahren zur Verfestigung eines Bodens

Country Status (2)

Country Link
EP (1) EP2636797A1 (de)
IT (1) ITRE20120016A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105908718A (zh) * 2016-06-22 2016-08-31 卢友周 一种咬合梅花桩
JPWO2021157699A1 (de) * 2020-02-07 2021-08-12

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080031695A1 (en) * 2006-08-07 2008-02-07 Nasr Mamdouh A Method for installing a screw pile
DE102008022478B3 (de) * 2008-05-07 2009-10-01 Krinner Innovation Gmbh Schraubvorrichtung zum Einschrauben von Fundamenteinrichtungen als Anbaugerät zum Anbau an den Auslegerarm eines Baufahrzeuges

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080031695A1 (en) * 2006-08-07 2008-02-07 Nasr Mamdouh A Method for installing a screw pile
DE102008022478B3 (de) * 2008-05-07 2009-10-01 Krinner Innovation Gmbh Schraubvorrichtung zum Einschrauben von Fundamenteinrichtungen als Anbaugerät zum Anbau an den Auslegerarm eines Baufahrzeuges

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105908718A (zh) * 2016-06-22 2016-08-31 卢友周 一种咬合梅花桩
JPWO2021157699A1 (de) * 2020-02-07 2021-08-12
WO2021157699A1 (ja) * 2020-02-07 2021-08-12 Ｊｆｅスチール株式会社 鋼管杭

Also Published As

Publication number Publication date
ITRE20120016A1 (it) 2013-09-10

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