EP2107165A1 - Verfahren zur Verankerung eines länglichen, geradlinigen Elements in den Bodem - Google Patents

Verfahren zur Verankerung eines länglichen, geradlinigen Elements in den Bodem Download PDF

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Publication number
EP2107165A1
EP2107165A1 EP09156748A EP09156748A EP2107165A1 EP 2107165 A1 EP2107165 A1 EP 2107165A1 EP 09156748 A EP09156748 A EP 09156748A EP 09156748 A EP09156748 A EP 09156748A EP 2107165 A1 EP2107165 A1 EP 2107165A1
Authority
EP
European Patent Office
Prior art keywords
driving tube
rod
soil
driving
percussion
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Withdrawn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
EP09156748A
Other languages
English (en)
French (fr)
Inventor
Daniele Attala
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.)
Trevi SpA
Original Assignee
Trevi 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 Trevi SpA filed Critical Trevi SpA
Publication of EP2107165A1 publication Critical patent/EP2107165A1/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Withdrawn legal-status Critical Current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
    • E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/02—Improving by compacting
    • E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00—Excavations; Bordering of excavations; Making embankments
    • E02D17/20—Securing of slopes or inclines
    • 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
    • E02D7/18—Placing by vibrating

Definitions

  • the present invention relates to a method for anchoring in the soil an elongate rectilinear member, such as, for example, a stabilizing structural member, or a tubular member intended to perform drainage functions or to inject consolidating mixtures in the soil.
  • an elongate rectilinear member such as, for example, a stabilizing structural member, or a tubular member intended to perform drainage functions or to inject consolidating mixtures in the soil.
  • the present invention aims at providing a rapidly performable method which can be used in any types of soil, allowing leaving installed and cementing functional members of any types in the soil in a quick, safe, and low cost manner. Furthermore, it is desired to implement a cementitious coating sheath that ensures an efficient anchoring around the member driven in the soil.
  • Application examples are the driving and anchoring in the soil of metal tubes having the function of micropiles, riveting operations for unstable slopes, laying of tunes (fitted with valves or not) for injections, tubes in fibreglass-reinforced plastic, draining tubes, etc.
  • a first embodiment of an elongate rectilinear rigid member to which the present invention is applicable is indicated with 10, a stabilizing structural member in this example.
  • the member 10 comprises a rod 11, preferably a tubular rod, at the lower end of which an enlarged bottom portion 12 is firmly secured which, in the example of Fig. 1 , is a transversal disc-shaped plate 12.
  • the member 10 is intended to be permanently driven in a soil and optionally connected to a surface structure (not shown) to be stabilized.
  • the elongate member 10 will be able to be a tubular member adapted to perform functions of a non-structural type, for example, a tubular member to carry out soil-consolidation injections, or a draining tubular member.
  • the elongate member 10 can be made in plastic material, for example, PVC. If it has to perform structural functions, the member 10 is preferably in steel or fibreglass-reinforced plastic.
  • the rod 11 will be able to be simply rested against the enlarged bottom portion 12.
  • the terms and phrases denoting positions and orientations are meant to refer to the rod 11 longitudinal central axis x, in a condition thereof as installed in the soil.
  • Such terms as “upper” and “lower” are to be meant relative to the driving depth in the soil, considering that the member 10 in many cases will be driven according to different orientations relative to the vertical one.
  • the term “lower end” denotes the part intended to be located more deeply from the soil surface.
  • a driving device for the member 10 is generally indicated with 20 in Fig. 2 , and includes an driving tube 21 which is open inferiorly and associated to an actuator device schematically indicated with 22.
  • the latter by means of percussion, or vibration, or rotation, or static thrust, or a combination of these actions, acts on the tube 21 upper end 23 through a coupler 24.
  • the actuator device 22 is slidably driven along a tower or guide antenna of a self-propelled drilling machine 30.
  • the implementation and operative characteristics of the machine 30 (which will be able to be of any known types, for example, a revolving tower) are not per se relevant for the purposes of understanding the invention; therefore, they will not be described herein in detail. It will be sufficient to point out herein that the machine 30 will be able to drive only the transverse handling of the driving device 20, or to transmit a combined roto-translation movement to the latter in order to transmit a roto-percussion, or vibration, or static driving movement to the member 10 to be driven.
  • the machine 30 may include a pump (not shown) for the injection of a cementitious mixture.
  • the driving tube 21 lower end engages with the bottom portion 12 upper face.
  • the engagement type and the shape of the contacting surfaces will be able to vary.
  • the tube 21 lower edge abuts against the peripheral part of the bottom portion 12 upper face to transmit the percussion blows to the latter.
  • both the bottom portion 12 and the lower end of the tube 21 have an interface with radial or transversal relieves 13 and corresponding recesses 25 to impart a rotative motion component to the member 10 around the translation axis.
  • the lower surface of the member 10 bottom portion 12 can take a flat shape, as illustrated in Fig. 1 , suitable for the operation by simple percussion.
  • the bottom surface preferably has a circular shape (plane view), and it is suitably provided with lower projections 14 in the shape of chisel blades or other shapes which are typical of the disaggregating means of the drilling bits.
  • the driving tube 21 has an outer cylindrical surface with a diameter substantially equal to or slightly lower than the bottom portion 12 diameter or maximum transversal dimension.
  • the rod 11 if it is a hollow tubular one, has the end thereof upwardly open, and it has one or more lower outlet holes 15 at the bottom to inject a cementitious consolidating mixture through the member 10.
  • the mixture can be injected through the driving tube 21, which to this aim has an upper inlet 26 ( Fig. 2 ) for the inlet of the mixture.
  • the driving tube 21 is inserted on the member 10, with the tubular members 11 and 21 coaxially arranged, and the driving tube 21 lower edge engaged against the enlarged bottom portion 12.
  • the driving device 20 is actuated, by making it to slide downwardly along the drilling machine tower, thus creating a borehole F in the foundation soil T.
  • the downward movement of the driving device is stopped once the desired depth is reached.
  • the injection of a consolidating cementitious mixture is started, which saturates the gap G between the tubular rod 11 and the borehole, and the tube 21 is withdrawn from the soil, which tube is reclaimed and reused.
  • the mixture injected in the gap G concurs to firmly anchor the member 10 in the soil, so that the latter is able to perform efficiently.
  • the member 10 is a stabilizing member, it will have to be able to efficiently exchange forces, mainly traction ones, with the structure to be stabilized.
  • the injection of the consolidating mixture around the member 10 can occur according to different modes.
  • the pressurized cementitious mixture is injected through the driving tube 21 from the inlet 26, preliminarily or simultaneously to the withdrawal step of the tube 21 from the borehole.
  • the mixture can be injected through a packer tube (not shown) inserted through the tubular rod 11, so as it exits from the outlet nozzles 15 at the base of the member 10 or through other holes prearranged therein at different levels, according to the needs.
  • This second mode is to be performed following the withdrawal of the driving tube, and it can be repeated in successive steps, as needed.
  • the filling of the gap G between the borehole F drilled in the soil and the rod 11 outer surface occurs from the bottom, since the rise of the mixture drags the debris upwardly, and avoids the build-up thereof at the bottom of the hole. In this way, it is possible to carry out successive injection steps after the first injection is set, thus forming a pressurized injection bulb.
  • the mixture can be poured around the rod 11 from above after the withdrawal of the driving tube 21, according to modes which are similar to those followed for the implementation of conventional micropiles or anchoring tension rods.
  • the thrust movement caused by driving of the assembly composed of the elongate member 10 and the driving tube 21 in the soil is of the static, and not percussion, type.
  • the thrust is imparted by an oleodynamic device 22, preferably consisting of one or more hydraulic pistons connected through brackets 32 to contrast means 33 anchored to an external structure 34 or to the soil.
  • the same device can be used, at the end of the driving step, to lift the tube 21, thus withdrawing it from the hole.
  • the final step of the driving operation is represented in Fig. 6 .
  • the invention is not limited to the embodiments described and/or illustrated herein, which are to be meant as examples. Instead, the invention is susceptible to modifications regarding shapes, dimensions, materials employed, structural and functional details.
  • the length of the tubular bodies 11 and 21, preferably of steel will be able to reach some metres in length, with an outer diameter of the order of 60-200 mm.
  • the tubular rod 11, which is left in situ as a reinforcement can have a reduced thickness, for example, of 4 mm, while the driving tube 21 will have a significantly larger thickness, of the order of 10-20 mm.
  • the outer diameters of the tubular bodies will be able to vary from some centimetres to 10 cm and above. If the method does not provide for the injection of the consolidating mixture through the rod 11, the latter can be solid, instead of being tubular and hollow.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Structural Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Paleontology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Agronomy & Crop Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Soil Sciences (AREA)
  • Piles And Underground Anchors (AREA)
  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
  • Refuge Islands, Traffic Blockers, Or Guard Fence (AREA)
EP09156748A 2008-03-31 2009-03-30 Verfahren zur Verankerung eines länglichen, geradlinigen Elements in den Bodem Withdrawn EP2107165A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITTO20080246 ITTO20080246A1 (it) 2008-03-31 2008-03-31 Procedimento per ancorare nel terreno un elemento strutturale stabilizzante

Publications (1)

Publication Number Publication Date
EP2107165A1 true EP2107165A1 (de) 2009-10-07

Family

ID=40293304

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09156748A Withdrawn EP2107165A1 (de) 2008-03-31 2009-03-30 Verfahren zur Verankerung eines länglichen, geradlinigen Elements in den Bodem

Country Status (2)

Country Link
EP (1) EP2107165A1 (de)
IT (1) ITTO20080246A1 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3198857A (en) * 1962-05-08 1965-08-03 Raymond Int Inc Method of treating a mold for concrete with a bond release coating material
BE754765A (nl) * 1970-08-12 1971-01-18 Fundex Pvba Werkwijze voor het in de grond vormen van een betonpaal en een volgens deze werkwijze gevormde paal,
AT388406B (de) * 1979-05-14 1989-06-26 Bacs Megyei Allami Epitoipari Pfahlfundamentkonstruktion sowie einrichtung und betonierungsbehaelter zur herstellung derselben
US20060088388A1 (en) * 2004-10-27 2006-04-27 Wissmann Kord J Method and apparatus for providing a rammed aggregate pier

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3198857A (en) * 1962-05-08 1965-08-03 Raymond Int Inc Method of treating a mold for concrete with a bond release coating material
BE754765A (nl) * 1970-08-12 1971-01-18 Fundex Pvba Werkwijze voor het in de grond vormen van een betonpaal en een volgens deze werkwijze gevormde paal,
AT388406B (de) * 1979-05-14 1989-06-26 Bacs Megyei Allami Epitoipari Pfahlfundamentkonstruktion sowie einrichtung und betonierungsbehaelter zur herstellung derselben
US20060088388A1 (en) * 2004-10-27 2006-04-27 Wissmann Kord J Method and apparatus for providing a rammed aggregate pier

Also Published As

Publication number Publication date
ITTO20080246A1 (it) 2009-10-01

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