EP1845202A1 - Pieux pour renforcer d'une fondation de batiment - Google Patents

Pieux pour renforcer d'une fondation de batiment Download PDF

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Publication number
EP1845202A1
EP1845202A1 EP06112580A EP06112580A EP1845202A1 EP 1845202 A1 EP1845202 A1 EP 1845202A1 EP 06112580 A EP06112580 A EP 06112580A EP 06112580 A EP06112580 A EP 06112580A EP 1845202 A1 EP1845202 A1 EP 1845202A1
Authority
EP
European Patent Office
Prior art keywords
jacket
pile
sleeve
engagement means
pile according
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Withdrawn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
EP06112580A
Other languages
German (de)
English (en)
Inventor
Renato Canteri
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.)
Novatek SRL
Original Assignee
Novatek SRL
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 Novatek SRL filed Critical Novatek SRL
Priority to EP06112580A priority Critical patent/EP1845202A1/fr
Publication of EP1845202A1 publication Critical patent/EP1845202A1/fr
Withdrawn legal-status Critical Current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
    • E02D5/52—Piles composed of separable parts, e.g. telescopic tubes ; Piles composed of segments
    • E02D5/523—Piles composed of separable parts, e.g. telescopic tubes ; Piles composed of segments composed of segments
    • 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
    • E02D5/24—Prefabricated piles
    • E02D5/28—Prefabricated piles made of steel or other metals
    • E02D5/285—Prefabricated piles made of steel or other metals tubular, e.g. prefabricated from sheet pile elements

Definitions

  • the present invention relates to a pile for strengthening building foundations.
  • buildings comprise buried foundations on which the construction forming the portion of the building above the surface of the ground is erected.
  • the foundations are designed to support the portion of the building above the surface of the ground and keep it in a predetermined position.
  • the sizing and positioning of the foundations depends on the type of building to be erected and the type of ground on which the building will be built.
  • Such design conditions may also vary following modifications to the portion of the building above the surface of the ground, for example after extension work or the like.
  • a first type of prior art pile for strengthening building foundations consists of a hollow cylinder with a plurality of radial holes which is inserted in a hole which has the shape of a vertical shaft, made through the foundations and extending underneath them by a predetermined depth (normally calculated in such a way as to reach the more solid layers of the ground).
  • the hollow cylinder is filled with cement which, coming out of the radial holes, fills both the pile and the hole and stably anchors the pile to the ground. Connecting the pile to the foundations helps the latter to support the building.
  • this type of pile for strengthening building foundations does not allow a guarantee to be provided in advance of a predetermined resistance to the load to be supported, since the maximum load which can effectively be reached by the pile before it gives way and sinks into the ground can only be established after installation or using estimate calculations which have a significant margin of error.
  • the pile is not easy to handle, since it often consists of a single, very long element.
  • a known pile for strengthening building foundations which at least partly overcomes the above-mentioned disadvantages, consists of a suitably sized iron bar, which is driven into the ground through a hole made in the foundations then connected to the foundations.
  • the depth to which the bar is pushed into the ground depends on the load which must be supported. Measuring the force necessary to make the bar penetrate the ground, it is possible to establish the load that the bar can support without it sinking any further, and therefore interrupting bar driving when the required resistance to penetration value is reached guarantees that the load will be supported.
  • the main technical purpose of the present invention is to propose a pile for strengthening building foundations which is free of the above-mentioned disadvantages.
  • the aim of the present invention is to provide a pile for strengthening building foundations which resists corrosion.
  • Another aim of the present invention is to propose a pile for strengthening building foundations which is able to support a predetermined load.
  • Yet another aim of the present invention is to provide a pile for strengthening building foundations with reasonable production costs.
  • a further aim of the present invention is to propose a pile for strengthening building foundations which is easy to handle.
  • the numeral 1 denotes as a whole a pile for strengthening building foundations in accordance with the present invention.
  • the pile 1 comprises an outer jacket 2 and a core 3 located inside the jacket 2 and connected to it (in the embodiment illustrated the connection consists of the bond between the core 3 and the jacket 2).
  • the outer jacket 2, in the preferred embodiment illustrated, is a tube with a circular cross-section and has a main direction of extension X.
  • the outer jacket 2 may have the shape of any hollow straight prism with a polygonal base.
  • the diameter of the outer jacket 2 that is to say the dimension transversal to the main direction of extension X, is between 3 and 15 cm, preferably between 4 and 10 cm, and more preferably less than 8 cm.
  • diameter is used in this context to indicate the diameter of a circle having the same area as the polygon forming the transversal area of the jacket 2.
  • the jacket 2 has the shape of a tube with a circular base, as in the embodiment illustrated in the accompanying drawings, the equivalent diameter therefore coincides with the effective diameter of the circle forming the base of the jacket 2.
  • the core 3 of the pile 1 at least partly consists of an inert material 4.
  • the inert material 4 consists of a cement-based mix, that is to say building material consisting of a mixture of mortar and rough stones or pieces of broken stone.
  • the cement-based mix may be concrete, that is to say consisting of a mixture of a hydraulic binder, for example cement, or air binder, for example lime, aggregates, for example sand and gravel, and water.
  • a hydraulic binder for example cement
  • air binder for example lime
  • aggregates for example sand and gravel
  • the particle size distribution of the aggregates is low, to guarantee even distribution of the aggregates in the core of the pile 1 and the concrete may be enriched with hardening additives to help it to set in the pile 1 before installation (described in detail below).
  • the core may also be strengthened with metal elements such as iron rods (for example giving reinforced concrete).
  • the inert material 4 may also comprise one or more synthetic components (such as resins) acting as binders or constituting the entire core.
  • the jacket 2 is made of stainless steel and is between 0.8 and 5 mm thick, preferably between 1 and 3 mm thick, or more preferably 1.5 mm thick.
  • the reduced thickness of the jacket guarantees not just the required strength, but also a reasonable pile 1 weight and very reasonable production costs.
  • the pile 1 comprises engagement means 5 attached to at least a first end 2a of the jacket 2 to allow connection of two consecutive piles, thus making the pile a modular element.
  • the engagement means 5 are also attached to a second end 2b of the jacket 2 opposite the first end 2a, whilst there remains a central portion 2c of jacket 2 without engagement means 5.
  • the engagement means 5 comprise a sleeve 6 attached to the second end 2b of the jacket 2, and such that its can receive the first end 2a of another pile 1 and connect with it.
  • the sleeve 6 forms one part with the jacket 2 and consists of the second end 2b of the jacket 2 and the portion of jacket 2 adjacent to it.
  • the sleeve 6 is an ideal extension of the jacket 2, that is to say it has the same transversal dimensions and the same thicknesses as the central portion 2c of the jacket 2.
  • the sleeve 6 may be engaged by a tapered portion 7 of the jacket 2 of another pile 1 located at the first end 2a of the jacket 2 and contributing to formation of the engagement means 5.
  • said tapered portion 7 comprises a first zone 8 with a dimension transversal to the main direction of extension X of the jacket 2 which is less than the transversal dimension of the central portion 2c of the jacket 2.
  • the transversal dimension of the first zone 8 of the tapered portion 7 is equal to the difference between the transversal dimension of the central portion 2c of the jacket 2 and twice the thickness of the jacket 2 (in other words the tapered portion 7 and the sleeve 6 are shaped to fit one another).
  • the first zone 8 is the correct size for insertion in the sleeve 6 of another pile 1 since, as already indicated, the transversal dimensions and thicknesses of the sleeve 6 are identical to those of the central portion 2c of the jacket 2.
  • the tapered portion 7 also comprises a second connecting zone 9 (for example having the shape of an arc) which connects the first zone 8 to the central portion 2c of the jacket 2.
  • a second connecting zone 9 for example having the shape of an arc
  • the tapered portion 7 may be obtained by squashing the jacket 2 by applying an even pressure radially towards the axis of symmetry of the jacket.
  • the first zone 8 of the tapered portion 7 has a length L, that is to say extension in a direction parallel with the main direction of extension X of the jacket 2, substantially equal to the internal working length L1 of the sleeve 6.
  • the sleeve 6 is in particular easy to obtain by filling the jacket 2 with the core 3 only up to a distance from the second end 2b equal to L1.
  • the tapered portion 7 is filled with inert material 4 as far as the first end 2a, so that the free end 7a of the tapered portion 7, once inserted in the sleeve 6 of another pile 1, makes contact with the inert material 4 of the pile receiving said tapered portion 7.
  • connection of two or more piles 1 to one another ideally forms a single modular jacket completely filled with inert material.
  • Said solution can be achieved either by applying on the outside of the second end 2a and axially projecting from it (for example by welding, squashing, screwing, etc.), a specific sleeve 6, or by widening the jacket 2 at and near to the second end 2b to form a widened portion of it (deformation similar but opposite to that required to obtain the tapered portion 7).
  • the thickness of the jacket 2 is preferably practically constant along the entire length of the jacket 2, in other words the central portion 2c and the two end portions 2a, 2b of the jacket have the same thickness specified above (even if due to the tapering the tapered portion may actually be slightly thicker).
  • a pile 1 with a diameter of approximately 4.8 cm and thickness of 1.5 mm can withstand a compression load of more than 20,000 kg and a working bearing capacity, in operation, which may reach 10,000 kg.
  • the pile 1 is driven into the ground with the tapered portion 7 downwards and the sleeve 6 upwards.
  • the operation goes on with the connection to one another of several piles until the force required to make the assembly consisting of the plurality of piles connected to one another penetrate the ground reaches a predetermined value matching the weight force which the assembly must support in operation. At this point, the assembly of piles is connected to the foundations, using known methods which are therefore not described, to help the foundations support the building.
  • the pile for strengthening building foundations disclosed allows the production of a modular pile assembly.
  • the invention described above therefore achieves the preset aims.
  • jacket of the pile for strengthening building foundations disclosed is made of stainless steel allows the pile to resist corrosion, even in the presence of high levels of moisture and mineral salts.
  • the pile being made of stainless steel, the fact that the pile consists of a steel jacket with limited thickness and a core of inert material significantly reduces the production costs.
  • the fact that the core consists of inert material, combined with the mechanical properties of the jacket, means that it can support significant loads.
  • the modularity of the piles allows smaller piles to be used, guaranteeing that they are easier to handle.

Landscapes

  • 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)
EP06112580A 2006-04-12 2006-04-12 Pieux pour renforcer d'une fondation de batiment Withdrawn EP1845202A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06112580A EP1845202A1 (fr) 2006-04-12 2006-04-12 Pieux pour renforcer d'une fondation de batiment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06112580A EP1845202A1 (fr) 2006-04-12 2006-04-12 Pieux pour renforcer d'une fondation de batiment

Publications (1)

Publication Number Publication Date
EP1845202A1 true EP1845202A1 (fr) 2007-10-17

Family

ID=37402589

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06112580A Withdrawn EP1845202A1 (fr) 2006-04-12 2006-04-12 Pieux pour renforcer d'une fondation de batiment

Country Status (1)

Country Link
EP (1) EP1845202A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1981003672A1 (fr) * 1979-12-19 1981-12-24 Gustavsberg Ab Piliers
EP0156538A1 (fr) * 1984-03-02 1985-10-02 Erico Products, Inc. Prise de terre, raccord et méthode pour fabriquer un tel raccord
EP0337543A2 (fr) * 1988-04-14 1989-10-18 F O Peterson & Söner Byggnads AB Aboutage de sections de tube d'acier pourvus d'un revêtement thermoplastique externe
GB2414032A (en) * 2004-05-11 2005-11-16 Shire Structures Ltd Pile with adjustable level of friction / bearing

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1981003672A1 (fr) * 1979-12-19 1981-12-24 Gustavsberg Ab Piliers
EP0156538A1 (fr) * 1984-03-02 1985-10-02 Erico Products, Inc. Prise de terre, raccord et méthode pour fabriquer un tel raccord
EP0337543A2 (fr) * 1988-04-14 1989-10-18 F O Peterson & Söner Byggnads AB Aboutage de sections de tube d'acier pourvus d'un revêtement thermoplastique externe
GB2414032A (en) * 2004-05-11 2005-11-16 Shire Structures Ltd Pile with adjustable level of friction / bearing

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