WO2015128515A1 - Pieu ayant un profil à section monosymétrique pour retenir des terres - Google Patents

Pieu ayant un profil à section monosymétrique pour retenir des terres Download PDF

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Publication number
WO2015128515A1
WO2015128515A1 PCT/ES2014/070155 ES2014070155W WO2015128515A1 WO 2015128515 A1 WO2015128515 A1 WO 2015128515A1 ES 2014070155 W ES2014070155 W ES 2014070155W WO 2015128515 A1 WO2015128515 A1 WO 2015128515A1
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WO
WIPO (PCT)
Prior art keywords
profile
pile
section
wings
monosymmetric
Prior art date
Application number
PCT/ES2014/070155
Other languages
English (en)
Spanish (es)
Inventor
Luisa María GIL MARTÍN
Enrique HERNÁNDEZ MONTES
Original Assignee
Universidad De Granada
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 Universidad De Granada filed Critical Universidad De Granada
Priority to ES201590135A priority Critical patent/ES2563214B1/es
Priority to PCT/ES2014/070155 priority patent/WO2015128515A1/fr
Publication of WO2015128515A1 publication Critical patent/WO2015128515A1/fr

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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

Definitions

  • the present invention is part of the civil engineering sector. Specifically in the construction sector that requires land containment and more specifically in the design and manufacture of piles for land containment.
  • Piles with embedded profiles are usually executed by introducing, after the extraction of the cylindrical section of the earth (on-site execution), a metal profile with a section in the form of "double T", “I” or “H”, with equal wings (doubly symmetrical), and adding the concrete later, or filling the hole made of concrete and subsequently introducing the metal profile.
  • a metal profile with a section in the form of "double T", "I” or “H”, with equal wings (doubly symmetrical) and adding the concrete later, or filling the hole made of concrete and subsequently introducing the metal profile.
  • the only prior known by the applicant on the use of monosymmetric profiles in containment piles is the CN20072042973U patent that describes the use of more than one monosymmetric profile to achieve greater efficiency of the steel used as concrete reinforcement. Previously, the use of profiles with a monosymmetric section has not been considered.
  • the object of the present invention is a pile for the containment of land with an embedded metal profile characterized in that the section of the profile is monosymmetric, so as to optimize the structure of the retaining walls.
  • the profile embedded in the proposed pile has a cross section whose dimensions are smaller than the current solutions that employ a profile with bisimetric section of equal wings, thus achieving a significant reduction of the material used and, therefore, greater efficiency in The global energy consumption.
  • Figure 2. Shows a cross section of a pile with a double-symmetrical embedded profile.
  • P represents the outline of the pile, b f the width of the wings of the profile, f the thickness of the wings, t w the thickness of the soul, h the nominal height and h w the atura of the soul.
  • Figure 3. Shows a cross section of a pile with a monosymmetric embedded profile, whose wings have different widths (b f i and b f 2).
  • Figure 4. Shows a cross section of a pile with a monosymmetric embedded profile whose wings have different widths (b f i and b f 2) and thicknesses (t f iyt f ⁇ )
  • Figure 5. Shows the distribution of tensions in the cross-section defined by the angle frac that separates the fractionated fibers from the compressed.
  • Figure 6. Shows a representation of the different solutions obtained in the optimization process. In this diagram, the points corresponding to the minimum steel section for each core value, h w .
  • a laminated profile is called a metallic element whose cross section is made up of several rectangles (called "sheets").
  • sheets Depending on the number of plates and their relative orientation, different types of cross sections are obtained.
  • profiles with a T or L section are obtained; while using 3 plates, U, I, H, or Double T profiles are obtained. The connection between these plates is made by curved agreements.
  • Laminated profiles are produced from hot rolling of billet or billet until the desired shape is formed. Among its characteristics, its structural uniformity stands out because they do not have welds or seams and have a low level of accumulation of localized residual stresses. They are distinguished, basically in two large families: a.l. Parallel wing profiles:
  • Parallel wing profiles are produced in sections “I” and “H”, also called double T. They are also called “IPE profiles”. They are characterized by having wings perpendicular to the soul, with parallel, rectilinear faces and constant thickness.
  • profile with double section T includes the profile whose smaller wing has a width equal to the thickness of the soul, or T-profile. a.2. Sloped wing profiles:
  • the inclined wing profiles are basically produced in sections type "I”, "U” and “L” and are characterized by having the outer wings of the wings perpendicular to the soul, while the inner faces of the wings have an inclination with respect to the outer face, whereby the thicknesses of the wings are decreasing.
  • Fig. 1, A which has a single axis of symmetry (el) along the soul of the profile
  • Fig. 1, B it will be understood a profile that has a second axis of symmetry (e2) perpendicular to the previous one (el).
  • the profiles embedded in piles that are commonly used are steel profiles with a double-symmetric double T profile whose wings have the same width (Fig. 2, w) and thickness (Fig 2, t f ) dimensions.
  • a new type of pile comprising a single embedded monosymmetric laminated profile, so that the wings of the profile can have different widths (Fig. 4, Wi and W2) and / or different thickness (Fig. 5, t f iyt f 2), and whose dimensions allow to reduce the amount of steel needed without the pile stop resisting the required solicitations.
  • the dimensions of the profile are determined using the optimization method object of the invention. To execute this procedure, it is admitted that the midpoint of the core of the embedded profile coincides with the center of the concrete circle. Since the steel is completely embedded in the concrete section, instabilities will not appear and, therefore, the depletion of the mixed concrete-steel section will be plastic.
  • the maximum and minimum quantity of embedded steel is defined by the contribution coefficient defined in the mixed structure regulations (Eurocode 4).
  • N d N c (0) + N s (0)
  • N d is the design axil
  • M d is the design bending moment
  • ⁇ 3 ( ⁇ ) and ⁇ 3 ( ⁇ ) are the axil and flector weathered by concrete, respectively
  • ⁇ 3 ( ⁇ ) and M s ( ⁇ ) represent the axil and flector resisted by steel, respectively; and ⁇ is a variable that defines the angle of the fiber that separates the compressed and fractional parts of the cross section. ( Figure 5)
  • a s being the area of embedded steel
  • a c the area of concrete
  • f and d and f cd the calculation strengths of steel and concrete respectively.
  • the parameters involved in the procedure are: D diameter of the concrete section -pilot- f and d characteristic strength of the concrete
  • the optimization process is defined by the following reasoning: to optimize the capacity of both materials, the largest wing of the metal section, which requires a greater amount of steel, in the fractional part of the cross section and as far as possible from the center of gravity of the section.
  • the object procedure comprises the following steps:
  • the set of parameters t w , h w , b f i, b f 2, t f i and t f 2 will be determined by the dimensions of the sheets available for making laminated profiles.
  • the values t w fixing iyt t f f 2 at the beginning of the process so that the only parameters that vary are the high soul and width of the wings.
  • the procedure comprises the following steps:
  • the stored data can be plotted as a total area of steel versus height of the soul in one so that all possible solutions can be visualized.
  • the optimal profile to be embedded can be decided taking into account other factors.
  • the beam core can be replaced by a set of steel bars welded to the souls, also called latticework. The calculation method that is applied to size the profile of a Steel beam is also valid for sizing such a lattice.
  • the wing of greater area is concentrated in the part that does not give land, while the case of cantilever retaining wall, the wing of Greater area is concentrated in the part that is in contact with the contained earth.
  • the preferred embodiment consists of a pile (16) with a monosymmetric embedded profile where the wings of the profile are not equal and can even be a T if one of the wings is not necessary.
  • Pile with embedded monosymmetric profile that resists a bending moment of 515kN.m The following example shows the dimensioning of a pile with a diameter of 600mm to resist a bending moment of 515 kN-m.
  • N d 0 and M d
  • the optimal dimensions depending on the type of profile are:
  • the pile object of the invention can save a significant amount of steel with respect to the doubly symmetrical profile traditionally used (10% in the case of the monosymmetric profile and 16.6% in the case of the T-profile).

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)
  • Bulkheads Adapted To Foundation Construction (AREA)

Abstract

La présente invention porte sur un nouveau type de pieu qui comprend un profil unique laminé monosymétrique embouti, de sorte que les ailes du profil peuvent avoir une largeur distincte et/ou une épaisseur distincte et dont les dimensions permettent de réduire la quantité d'acier nécessaire sans pour autant empêcher le pieu de résister aux sollicitations requises.
PCT/ES2014/070155 2014-02-28 2014-02-28 Pieu ayant un profil à section monosymétrique pour retenir des terres WO2015128515A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
ES201590135A ES2563214B1 (es) 2014-02-28 2014-02-28 Pilote con perfil de sección monosimétrica para contención de tierras
PCT/ES2014/070155 WO2015128515A1 (fr) 2014-02-28 2014-02-28 Pieu ayant un profil à section monosymétrique pour retenir des terres

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/ES2014/070155 WO2015128515A1 (fr) 2014-02-28 2014-02-28 Pieu ayant un profil à section monosymétrique pour retenir des terres

Publications (1)

Publication Number Publication Date
WO2015128515A1 true WO2015128515A1 (fr) 2015-09-03

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/ES2014/070155 WO2015128515A1 (fr) 2014-02-28 2014-02-28 Pieu ayant un profil à section monosymétrique pour retenir des terres

Country Status (2)

Country Link
ES (1) ES2563214B1 (fr)
WO (1) WO2015128515A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5988537A (ja) * 1982-11-10 1984-05-22 Sekisui Plastics Co Ltd 柱列土留用鋼材の引抜き方法
US4585678A (en) * 1984-07-11 1986-04-29 Kabushiki Kaisha Ask Kenkyusho Steel sheet pile, sheet pile assembly thereof and the method of constructing the assembly
EP1400633A2 (fr) * 2002-09-19 2004-03-24 Sigma Consult GmbH Tête de forage
EP1418277A1 (fr) * 2002-11-06 2004-05-12 Chiaverotti BVBA Procédé de construction d'un mur de soutènement

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5988537A (ja) * 1982-11-10 1984-05-22 Sekisui Plastics Co Ltd 柱列土留用鋼材の引抜き方法
US4585678A (en) * 1984-07-11 1986-04-29 Kabushiki Kaisha Ask Kenkyusho Steel sheet pile, sheet pile assembly thereof and the method of constructing the assembly
EP1400633A2 (fr) * 2002-09-19 2004-03-24 Sigma Consult GmbH Tête de forage
EP1418277A1 (fr) * 2002-11-06 2004-05-12 Chiaverotti BVBA Procédé de construction d'un mur de soutènement

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 200428, Derwent World Patents Index; Class q42, AN 2004-296983, RETRIEVED *
DATABASE WPI Week 200433, Derwent World Patents Index; Class q42, AN 2004-349819 *

Also Published As

Publication number Publication date
ES2563214A1 (es) 2016-03-11
ES2563214B1 (es) 2016-12-27

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