EP4065775A1 - Palplanche métallique réutilisable - Google Patents

Palplanche métallique réutilisable

Info

Publication number
EP4065775A1
EP4065775A1 EP19813945.3A EP19813945A EP4065775A1 EP 4065775 A1 EP4065775 A1 EP 4065775A1 EP 19813945 A EP19813945 A EP 19813945A EP 4065775 A1 EP4065775 A1 EP 4065775A1
Authority
EP
European Patent Office
Prior art keywords
metal sheet
sheet pile
pile according
plane
circle
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.)
Pending
Application number
EP19813945.3A
Other languages
German (de)
English (en)
Inventor
Aloyse Hermes
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.)
ArcelorMittal SA
Original Assignee
ArcelorMittal SA
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 ArcelorMittal SA filed Critical ArcelorMittal SA
Publication of EP4065775A1 publication Critical patent/EP4065775A1/fr
Pending legal-status Critical Current

Links

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
    • E02D5/02—Sheet piles or sheet pile bulkheads
    • E02D5/03—Prefabricated parts, e.g. composite sheet piles
    • E02D5/04—Prefabricated parts, e.g. composite sheet piles made of steel
    • 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
    • E02D5/02—Sheet piles or sheet pile bulkheads
    • E02D5/03—Prefabricated parts, e.g. composite sheet piles
    • E02D5/04—Prefabricated parts, e.g. composite sheet piles made of steel
    • E02D5/08—Locking forms; Edge joints; Pile crossings; Branch pieces

Definitions

  • the present invention relates to a metal sheet pile, in particular a metal sheet pile for the construction of temporary structures.
  • metal sheet piles for the construction of earth retaining structure, such as river embankments, quay walls of ports, retaining walls, cut-off walls, basements, underground carparks, abutments for bridges or earthquake strengthening structures, where a differential surface level is to be established.
  • earth retaining structure such as river embankments, quay walls of ports, retaining walls, cut-off walls, basements, underground carparks, abutments for bridges or earthquake strengthening structures, where a differential surface level is to be established.
  • These structures can be either temporary or permanent.
  • the metal sheet piles are driven in the ground, alone or in pairs so that the interlock located on one of their lateral extremities slot into the interlock of a metal sheet pile previously driven in the ground. Once the metal sheet piles have been assembled, the assembly must resist the mechanical constraints imposed by the ground.
  • the metal sheet piles are thus designed to have both a good drivability and a good resistance to declutching.
  • the aim of the present invention is therefore to remedy the drawbacks of the metal sheet piles of the prior art by providing a sheet pile whose drivability and reusability have been improved while maintaining a good resistance to declutching.
  • a first subject of the present invention consists of a metal sheet pile comprising in cross-section a central web bordered by outwardly inclined flanges, the extremities of which are inclined at an angle a of at least 97° with respect to the neutral axis Pi of the metal sheet pile and are extended by an interlock comprising consecutively:
  • a finger of substantially triangular cross-section extending upward from the bottom part, pointing towards the inclined flange, having a projected width Wi on plane Pi , the fingertip being separated from the inclined flange by distance W2, Wi and W2 satisfying the inequation (ii):
  • the metal sheet pile according to the invention may also have the optional features listed below, considered individually or in combination:
  • - angle a is comprised between 97° and 101°
  • the ratio between the radius of curvature Ri and the radial thickness T 1 is comprised between 1.5 and 2.5
  • the first portion of circle has an angle of aperture y comprised between 20° and 137°
  • the finger comprises a lateral side and a top side, the vertex of which is rounded with a radius of curvature R3 equal to the radius of curvature Ri of the internal side of the bottom part,
  • the ratio between the projected width Wi of the finger and the distance W2 is comprised between 1.45 and 1.55,
  • - at least one of the inclined flanges comprise two sides which converge in the direction of the interlock with a convergence rate comprised between 1 and 3%
  • - at least one of the inclined flanges comprises a shoulder located at the junction between the central web and the at least one of the inclined flanges
  • a second subject of the invention consists of an earth retaining structure comprising at least two metal sheet piles according to the invention interlocked to one another.
  • the metal sheet pile 1 first comprises, in cross-section perpendicular to its length, a central web 2 and a first inclined flange 3 and a second inclined flange 4 both extending outwardly from the lateral edges of the central web.
  • the metal sheet pile is preferably made of steel and obtained by hot rolling.
  • the central web is preferably substantially flat and lies in a plane. It is preferably of constant thickness across the cross-section.
  • the two inclined flanges extend either on the same side of the central web so as to form a U-shaped sheet pile (as illustrated on Figure 1 ) or on two different sides so as to form a Z-shaped sheet pile (as illustrated on Figure 2).
  • the angle b between the central web and one inclined flange is generally comprised between 110° and 150°.
  • the sheet pile is preferably a U-shaped sheet pile.
  • inclined flanges 3 and 4 are symmetrical.
  • the inclined flange is of constant thickness across the cross-section. According to the variant illustrated on Figure 3, its thickness decreases towards the extremity of the sheet pile, i.e. towards the interlock.
  • the inclined flange has a conical cross-section. More preferably, the two sides of the flange converge in the direction of the interlock with a convergence rate comprised between 1 and 3%. The convergence rate is defined as the difference between the thicknesses at two points of the wing divided by the distance between these two points.
  • the conicity of the inclined flange(s) improves the drivability of the metal sheet pile while optimizing its weight.
  • the inclined flange(s) 3, 4 can comprise a shoulder 5 located at the junction between the central web 2 and the inclined flange(s).
  • shoulder it is meant a material extension projecting with respect to the imaginary plane which prolongs the external face of the inclined flange towards the central web. The shoulder increases the resistance modulus and thus the reusability of the metal sheet pile.
  • the central web can comprise an extension (not illustrated) projecting with respect to the imaginary plane which prolongs the external face of the central web towards the inclined flange.
  • the bending radius at the junction between the central web 2 and the inclined flange(s) 3, 4 can be increased so as to thicken the connection of the central web and the inclined flange(s) from the inside.
  • the concave corners 6 delimited by the two flange/web connections are substantially flattened by a material surcharge. This increases the mechanical resistance of the metal sheet pile and, thus, improves its reusability.
  • the extremity of the inclined flanges are inclined at an angle a of at least 97° with respect to the neutral axis Pi of the metal sheet pile.
  • the neutral axis is defined as the axis along which there are no stresses or strains.
  • the neutral axis is always parallel to the y-y axis of the sheet pile as defined in EN1993-5:2007.
  • the interlocks are on the neutral axis; in other words, the central web is parallel to the neutral axis.
  • the neutral axis is parallel to the inclined flanges and cross the central web in its middle.
  • angle a is comprised between 97° and 101° in order to have the best compromise between rotational capacity and resistance to declutching.
  • the flange is straight in that case.
  • the extremity of the inclined flange is bent so that angles a and b differ. Thanks to this bent at the extremity of the inclined flange, angle b can be adjusted to optimize the tension modulus of the sheet pile while angle a is adjusted differently to optimize the rotational capacity of the sheet pile.
  • one of the extremities of the inclined flanges is inclined with respect to the neutral axis in the form of a protrusion thickening the extremity in direction of the neutral axis. The other extremity is bent so that the interlocking is possible.
  • the metal sheet pile 1 further comprises a first interlock 8 and a second interlock 9 extending from the extremity of respectively the first inclined flange 3 and the second inclined flange 4.
  • Interlocks 8 and 9 are designed so that interlock 8 of a first metal sheet pile can slot into interlock 9 of a second metal sheet pile, as illustrated on Figure 4.
  • each of the two interlocks 8, 9 comprises a bottom part 10 convexly extending outward from the extremity of the inclined flange and a finger 11 of substantially triangular cross-section, extending upward from the bottom part.
  • the extremity of the inclined flange, the bottom part and the finger delimit a chamber 12.
  • the finger of a first metal sheet pile can slot into the chamber of a second metal sheet pile so as to connect the two sheet piles.
  • the bottom part 10 comprises an internal side 13 and an external side 14 separated by a radial thickness Ti.
  • internal side it is meant the side facing the chamber 12 and which extends from the external face of the inclined flange.
  • the external side is thus the side at the opposite from the chamber and which extends from the internal face of the inclined flange.
  • the internal side 13 extends along a first portion of circle 15 whose center lies in a plane P2 perpendicular to plane Pi and whose radius of curvature Ri satisfies inequation (i) :
  • the radial thickness Ti is defined as the thickness measured along the perpendicular bisector of the first portion of circle 15.
  • the center of the circle corresponding to the first portion of circle 15 is located above the bottom part.
  • the chamber 12 presents a rounded shape which improves the rotational capacity of the sheet pile.
  • the rounded bottom part thus strongly limits the risk of deforming the interlock when the sheet pile is driven in the ground and/or removed before reuse.
  • the ratio between the radius of curvature Ri and the radial thickness Ti is comprised between 1.5 and 2.5. This was found to be the best compromise between rotational capacity and resistance to declutching.
  • the perpendicular bisector of the first portion of circle 15 is within plane P2. This symmetry favors the interlocking of two adjacent sheet piles.
  • the first portion of circle 15 has an angle of aperture y comprised between 30° and 140°, depending on the radius of curvature Ri .
  • This favors a smooth transition between the bottom part and, on one side, the finger and, on the other side, the inclined flange.
  • the radius of curvature Ri and the angle of aperture y satisfy the inequation (iii):
  • the external side 14 extends along a second portion of circle 16 whose center lies in plane P2 and whose radius of curvature R2 is at least equal to Ri+T1 .
  • the perpendicular bisector of the first portion of circle 15 and the perpendicular bisector of the second portion of circle 16 are identical. This ensures a symmetrical distribution of the material on both sides of the perpendicular bisector of the first portion of circle 15. This favors a homogeneous behavior of the interlock.
  • the second portion of circle 16 and the first portion of circle are concentric.
  • R2 is equal to R1+T1.
  • R2 is greater than Ri +Ti .
  • the finger 11 is of substantially triangular cross-section, extending upward from the bottom part, pointing towards the inclined flange.
  • the cross-section of finger 11 is substantially a rectangular triangle, whose hypotenuse 17 is facing the chamber 12, whose lateral side 18 is parallel to plane P2 and whose top side 19 is parallel to plane Pi .
  • the vertex between the lateral side and the top side is rounded.
  • the radius of curvature R3 of the rounded vertex is equal to the radius of curvature Ri of the internal side 13 of the bottom part 10. This favors the interlocking of two interlocks and improves the rotational capacity of the sheet pile.
  • the vertex between the top side and the hypotenuse is rounded too to favors the interlocking of two interlocks.
  • the finger 11 has a projected width Wi which is defined as the distance along a plane parallel to Pi between the fingertip 20 and the plane P3, perpendicular to Pi , which contains the lateral side 18.
  • the finger 11 is separated from the extremity of the inclined flange by the distance W2, which is defined as the distance along a plane parallel to Pi between the fingertip 20 and the inclined flange.
  • the finger 11 is positioned so that W1 and W2 satisfy the inequation (ii):
  • the two interlocks 8, 9 can more easily interlock and rotate while maintaining a good resistance to declutching. Thanks to this ratio, and in combination with the rounded shape of the bottom part 10 and the inclination of the extremity of the inclined flange, the rotational capacity of the sheet pile is improved. This improved rotational capacity strongly limits the risk of deforming the interlock when the sheet pile is driven in the ground and/or removed before reuse.
  • the ratio between the projected width Wi of the finger and the distance W2 is comprised between 1 .45 and 1 .55. This was found to be the best compromise between rotational capacity and resistance to declutching.
  • Numerical simulations with the Qform metal forming simulation software have been performed on the metal sheet piles according to the invention.
  • the performed simulation is similar to a tensile test where a continuous axial displacement is imposed in the tool direction and the force on the clamp is measured.
  • the results are presented in Figure 9 where X is the time in seconds and Y is the force in MN. They show that, when R2 is equal to Ri +Ti , the interlock resists a load of 0.085 MN before declutching, which is similar to the performances obtained with the metal sheet pile from the prior art.
  • the results presented in Figure 10 show that increasing the radius of curvature R2 compared to Ri (as illustrated on Figure 8) further improves the resistance to declutching.

Landscapes

  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (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)
  • Bulkheads Adapted To Foundation Construction (AREA)

Abstract

L'invention concerne une palplanche métallique comprenant des brides inclinées dont les extrémités sont inclinées selon un angle α d'au moins 97° par rapport à l'axe neutre P1 et sont prolongées par un verrouillage mutuel comprenant consécutivement : - une partie inférieure comprenant un côté interne et un côté externe séparés par une épaisseur radiale T1, le côté interne s'étendant le long d'une première partie de cercle dont le centre se situe dans un plan P2 perpendiculaire au plan P1 et dont le rayon de courbure R1 satisfait l'inéquation (i) : 1,5≤R1/T1≤5 et le côté externe s'étendant le long d'une seconde partie de cercle dont le centre se situe dans le plan P2 et dont le rayon de courbure R2 est au moins égal à R1+T1, - un doigt ayant une largeur projetée W1 sur le plan P1, le bout de doigt étant séparé de la bride inclinée par une distance W2, W1 et W2 satisfaisant l'inéquation (ii) : 1,2≤W1/W2≤1,7
EP19813945.3A 2019-11-25 2019-11-25 Palplanche métallique réutilisable Pending EP4065775A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2019/060119 WO2021105740A1 (fr) 2019-11-25 2019-11-25 Palplanche métallique réutilisable

Publications (1)

Publication Number Publication Date
EP4065775A1 true EP4065775A1 (fr) 2022-10-05

Family

ID=68771728

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19813945.3A Pending EP4065775A1 (fr) 2019-11-25 2019-11-25 Palplanche métallique réutilisable

Country Status (2)

Country Link
EP (1) EP4065775A1 (fr)
WO (1) WO2021105740A1 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB326275A (en) * 1928-12-24 1930-03-13 Richard Henry Annison Improvements in and relating to interlocking sheet piling
WO2000028157A1 (fr) * 1998-11-10 2000-05-18 Georg Wall Element de liaison destine a des palplanches metalliques
CN201386275Y (zh) * 2008-12-23 2010-01-20 王银 具有涡旋配合结构的u形钢板桩
CN206245308U (zh) * 2016-12-06 2017-06-13 南京博睿工程咨询有限公司 防水钢板桩

Also Published As

Publication number Publication date
WO2021105740A1 (fr) 2021-06-03

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