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

Definitions

• the present invention relates to a "Z" shaped sheet pile with a high resistance modulus.
• Z-shaped sheet piles have been known for a long time. They have an oblique core connected to two substantially parallel wings. Each wing is provided with a locking element, to form in a retaining curtain a joint by engagement with a locking element of an adjacent sheet pile.
• the sheet piles in the shape of a "Z" are most often arranged so that their wings are substantially parallel and equidistant from the neutral plane of bending of the curtain.
• the “modulus of linear resistance” of the sheet pile curtain is called the resistance module with respect to the neutral plane of the curtain, referred to the current meter of curtain.
• sheet pile curtain means in the present context, a curtain composed of sheet piles in the shape of "Z” which are connected so that their wings are substantially parallel and equidistant from the neutral plane of bending of the curtain .
• ProfilARBED SA (Luxembourg) currently markets a "Z” shaped sheet pile called “AZ 36" which has a resistance module of 3600 cm3 per running meter of curtain.
• This AZ 36 sheet pile has a mass of 194 kg / m2, therefore a specific resistance modulus of 18.6 (cm3 / m) / (kg / m2).
• ProfilARBED SA also markets a "Z” shaped sheet pile called “BZ 42", which has a resistance module of 4200 cm3 per running meter of curtain, but a mass of 271 kg / m2, therefore a more unfavorable specific resistance module of 15.5 (cm3 / m) / (kg / m2). It is a sheet pile which has "BELVAL” type lock elements, and whose core describes an acute angle of approximately 83.5 ° with a plane parallel to the wings. There are also other types of "Z” sheet piling on the market which can reach moments of resistance up to 4550 cm3 per running meter of curtain. However, these types of sheet piles with higher resistance modulus are very heavy sections, which have a very high weight per square meter of curtain, therefore a fairly low specific resistance modulus. However, the lower the specific resistance module, the higher the cost of the curtain.
• the width of the wings and the height of the section determine the development of the sheet pile and therefore the width of the rolls of the roll stands.
• the width of these cylinders is limited by the width of the cages of the sheet pile rolling train. If you want to laminate sheet piles with a high resistance module on current rolling trains, the development of these sheet piles between the axes of the locks must be less than a value predetermined by the width of the cages of the sheet pile rolling train. c) one could gain in rolling width by increasing the acute angle that the core makes with a plane parallel to the wings (angle of inclination of the core). However, the closer this angle of inclination of the core is to 90 °, the more the resistance to driving the sheet pile increases. For implementation reasons, it is therefore recommended to choose an angle of inclination of the core less than 75 °.
• the problem underlying the present invention is to find a solution to further increase the resistance modulus of a hot-rolled "Z" sheet pile, without lowering the specific resistance modulus of the sheet pile and without requiring an increase in the width of the stands of the rolling mill.
• wing / core connections At the wing / core connections they have ribs, moldings, shoulders or projections incorporated in the sheet pile or fixed by any means to it. These ribs, moldings, shoulders or projections have the sole purpose of engaging in notches of complementary shape arranged in said intermediate plates. They thus make it possible to insert and hold in place these intermediate plates between two sheet piles in the shape of a "Z", in order to create the sheet pile curtain having a flat and continuous surface. From document FR-A-686816 are known sheet piles of "U" shape of low height, which have a reinforced part at the level of the wing / core connections.
• said reinforced part located immediately upstream of the opening of a hook of the first sheet pile, acts in combination with the internal part of this hook to create a shape capable of cooperating with the part outside of a hook of the second sheet pile.
• the hot rolled "Z” sheet pile according to the invention comprises, like all hot rolled “Z” sheet piles, two wings having substantially parallel external faces, as well as an oblique core connected to the two wings .
• This core defines with a plane parallel to the outer faces of the wings an acute angle less than or equal to 75 ° and is delimited between the connections with the wings by two substantially planar faces.
• the hot-rolled sheet pile according to the invention differs from a conventional hot-rolled sheet pile mainly in that each of the two wings has an extension which projects from the imaginary plane. extending the flat face of the core located on the same side as the outer face of the respective wing.
• a hot rolled sheet pile according to the invention has the advantage of providing with a small surplus of material, therefore with a small increase in the mass per square meter of curtain, a marked improvement in the modulus of resistance, and therefore also an improvement in the specific resistance modulus. It will be particularly appreciated that this improvement in the modulus of resistance can be obtained without increasing the width of the stands of the rolling mill, without increasing the thickness of the wings, and that it even makes it possible to increase the useful width of the wings.
• the proposed solution also leads to a strengthening of the wing / core connection corners on the outer side, hence a lower risk of tearing at these critical locations during the use of sheet piles.
• This reinforcement is also favorable to better resistance to accelerated corrosion in low water, because the sheet piles in the shape of "Z”, contrary to the sheet piles in the shape of "U”, especially tend to corrode at the level of the connections soul / wings .
• FIG. 1 shows a cross section of the sheet pile
• - Figure 2 shows an enlargement of a wing / core connection of the sheet pile of Figure 1.
• the sheet pile in the shape of "Z” according to Figure 1 comprises, like all the sheet piles in the shape of "Z", two wings 12 ', 12 “having external faces 14', 14" substantially parallel, as well as an oblique core 10 connected to the two wings 12 ', 12 ".
• This core 10 defines with a plane 16, which is parallel to the external faces 14', 14" of the wings 12 ', 12 “, an acute angle ⁇ . It is thinner than the wings 12 ', 12 “and is delimited between the connections with the wings 12', 12” by two faces 18 ', 18 “substantially planar and parallel.
• Each of these wings 12 ', 12 " is provided with a lock element 20',
• LARSSEN type lock elements, which make it possible to form” LARSSEN "type joints by interlocking, in a sheet pile curtain, with the lock elements of the adjacent sheet pile
• the dimensions of the sheet pile shown have been optimized using an optimization program and a computer to obtain a high strength modulus taking into account the various constraints mentioned in the introductory part of this description.
• a resistance modulus of 4400 cm 3 per unit length of a curtain has been obtained in which these sheet piles are connected so that the external faces 14 ', 14 "of their wings 12', 12" are substantially parallel and equidistant from the neutral plane of bending of the curtain.
• the specific resistance modulus of such a sheet pile wall is slightly less than 20 (cm3 / m) / (kg / m2).
• Figure 2 there is shown with a broken line a connecting surface 25 which would end the wing 12' in a sheet pile of conventional "Z". This connection surface 25 would be tangent to the external face 14 'of the wing 12' and would be connected tangentially to the face 18 'of the core 10.
• the core 10 is connected to the wing extension 22 'by a local allowance 26' of the core 10, so as to avoid the formation of a concave corner between the extension of wing 22 'and the core 10.
• This additional thickness 26' of the core 10 slightly decreases the specific resistance module of the sheet pile, but it makes rolling easier, and avoids deformations of the wing extension 22 ' during threshing. There is also obtained a better transmission of the anchoring forces of the wings 12 ′, 12 ′′ in the core 10 and vice versa.
• the wing extension 22 ′ is delimited by a first planar surface 30 which extends the planar face 14 ′ of the wing 12 ′, a second planar surface 34 which is substantially perpendicular to said first planar surface 30, and a convex cylindrical connection surface 32 which connects said first planar surface 30 to said second planar surface 34.
• Said excess thickness 26 'of the core 10 then defines a concave cylindrical connection surface 36 which connects the face 18' from the core 10 to said second flat surface 34 of the wing extension 22 '. This is an optimized configuration from the point of view of rolling the wing extensions 22 'and 22 ".
• the convex cylindrical fitting surface 32 has a radius of 15 mm
• the concave cylindrical fitting surface 36 has a radius of 125 mm.
• the linear resistance modulus of the optimized sheet pile with 22 ', 22 "wing extensions is 4800 cm3 / m, which represents an increase of approximately 9% compared to the optimized sheet pile without 22' wing extensions, 22 ".
• the specific resistance module of the optimized sheet pile with wing extensions 22 ', 22 " is approximately 20 (cm3 / m) / (kg / m2).
• the invention is of course not limited to the sheet pile described in detail, but that it can also be applied advantageously to sheet piles in the shape of "Z" having a modulus of linear resistance lower or higher as 4800 cm3 / m, substantially different dimensions, as well as sheet piles having lock elements other than "LARSSEN” type lock elements.

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• Engineering & Computer Science (AREA)
• Structural Engineering (AREA)
• Mining & Mineral Resources (AREA)
• Composite Materials (AREA)
• Life Sciences & Earth Sciences (AREA)
• General Life Sciences & Earth Sciences (AREA)
• Chemical & Material Sciences (AREA)
• Paleontology (AREA)
• Civil Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Bulkheads Adapted To Foundation Construction (AREA)
• Metal Rolling (AREA)
• Medicinal Preparation (AREA)

Priority Applications (7)

Applications Claiming Priority (2)

Related Child Applications (1)

Publications (1)

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ID=19731593

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Cited By (3)

Families Citing this family (8)

Citations (3)

• 1996
  • 1996-04-24 LU LU88747A patent/LU88747A1/fr unknown
• 1997
  • 1997-01-13 KR KR10-1998-0707626A patent/KR100432189B1/ko not_active IP Right Cessation
  • 1997-01-13 WO PCT/EP1997/000125 patent/WO1997040232A1/fr active IP Right Grant
  • 1997-01-13 EP EP97901012A patent/EP0895556B1/fr not_active Expired - Lifetime
  • 1997-01-13 DE DE69705944T patent/DE69705944T2/de not_active Expired - Lifetime
  • 1997-01-13 CZ CZ19983382A patent/CZ295754B6/cs not_active IP Right Cessation
  • 1997-01-13 AU AU14412/97A patent/AU1441297A/en not_active Abandoned
  • 1997-01-13 ES ES97901012T patent/ES2160318T3/es not_active Expired - Lifetime
  • 1997-01-13 RU RU98120913/03A patent/RU2167239C2/ru active
  • 1997-01-13 JP JP53763497A patent/JP3739096B2/ja not_active Expired - Fee Related
  • 1997-01-13 PL PL97329602A patent/PL183928B1/pl unknown
  • 1997-01-13 UA UA98116161A patent/UA54424C2/ru unknown
  • 1997-02-01 TW TW086101186A patent/TW360736B/zh not_active IP Right Cessation

Patent Citations (3)

Non-Patent Citations (1)

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