EP0117382A1 - Méthode pour contrôler la force d'impact et l'intervalle de choc dans les moutons à chute libre - Google Patents

Méthode pour contrôler la force d'impact et l'intervalle de choc dans les moutons à chute libre Download PDF

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Publication number
EP0117382A1
EP0117382A1 EP83850049A EP83850049A EP0117382A1 EP 0117382 A1 EP0117382 A1 EP 0117382A1 EP 83850049 A EP83850049 A EP 83850049A EP 83850049 A EP83850049 A EP 83850049A EP 0117382 A1 EP0117382 A1 EP 0117382A1
Authority
EP
European Patent Office
Prior art keywords
core
casings
casing
impact force
shock
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.)
Granted
Application number
EP83850049A
Other languages
German (de)
English (en)
Other versions
EP0117382B1 (fr
Inventor
Kjell Landaeus
Bertil Borg
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.)
Uddcomb Equipment Te Kallinge Zweden AB
Original Assignee
UDDCOMB SWEDEN AB
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 UDDCOMB SWEDEN AB filed Critical UDDCOMB SWEDEN AB
Priority to AT83850049T priority Critical patent/ATE42781T1/de
Priority to EP83850049A priority patent/EP0117382B1/fr
Priority to DE8383850049T priority patent/DE3379795D1/de
Publication of EP0117382A1 publication Critical patent/EP0117382A1/fr
Application granted granted Critical
Publication of EP0117382B1 publication Critical patent/EP0117382B1/fr
Expired 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
    • E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
    • E02D7/02—Placing by driving
    • E02D7/06—Power-driven drivers
    • E02D7/08—Drop drivers with free-falling hammer

Definitions

  • the invention relates to drop hammers for driving piles or the like into the ground, comprising a core which forms an impact surface at one end thereof, and casings which are mutually spaced substantially concentrically around the core, the casing closest to the core being connected at one end thereof with the core at the other end thereof while other casings are interconnected alternatingly at one end and the other beginning at the other end of said casing closest to the core.
  • a drop hammer should be substantially of the same length as the pile to be driven down into the ground by means of the drop hammer.
  • this is impractical and therefore the drop hammer is arranged as described above in order to obtain a long path of propagation for the shock wave while the drop hammer as such has a short length.
  • the invention relates to a method of controlling impact force and shock interval in a drop hammer of the type referred to above. It is desired to control impact force and shock interval for the reason that for driving a pile into the ground it may be necessary to have less force and longer shock instead of greater force and shorter shock in order that the pile will not wreck during driving. It is therefore desired to make possible that impact force and shock interval are adapted to the ground conditions and the pile material in the most favourable manner.
  • the object of the invention is to make possible such adaption, which in a drop hammer of the type referred to is achieved by the method of the invention having obtained the characteristics accordinq to the claim.
  • the drop hammer in FIG. 1 comprises a cylindrical core 10 which forms an impact surface 11 at one end thereof.
  • a first casing 12 is permanently connected to the core 10 at 13, and this casing surrounds the core concentrically spaced therefrom.
  • a second casing 14 is arranged concentrically with the core, and also the casings 12 and 14 are mutually spaced.
  • the casing 14 is permanently connected to the casing 12 at the lower end of the drop hammer at 15, and it is surrounded by a third casing 16 which is concentric with the core and is spaced from the casing 14, At 17 at the upper end of the drop hammer a permanent connection is provided between the casings 14 and 16 while said latter casing 16 at the lower end of the drop hammer is permanently connected at 18 to a fourth casing 19 spaced from the casing 16 and arranged concentrically with the core.
  • a shock wave generated in the core 10 when hitting a pile at the impact surface 11, will propagate through the core to the upper end thereof and via the connection at 13 to the casing 12, then downwards through said latter casing and via the connection at 15 upwards through the casing 14 from which the shock wave will pass to the casing 16 via the connection at 17 to propagate down the casing 16 and then via the connection 18 upwards through the casing 19, The shock wave then will be reflected back along the path described to the impact surface 11.
  • a shock wave transferring connection "short circuiting" between the core and a voluntary number of casings.
  • a short circuiting is shown in FIG. 1 between the core 10 and the second casing 14 and it is provided by means of a ring 20 at the lower end of the drop hammer such that the shock wave will propagate from the impact surface 11 via the ring 20 and the connection 15 directly to the casing 14 so as to follow thereafter the same path as before to the upper end of the casing 19.
  • This shortening of the path of the shock wave provides a greater impact force; however, the shock interval will be shorter.
  • the impact force can be further increased by short circuiting several casings as is shown in FIG. 2 wherein a ring 20' forms a shock wave transferring connection from the core 10 directly to the outermost casing 19, which means that the shock interval will be still shorter than in the arrangement shown in FIG. 1,
  • rings of different sizes in order to provide a shock wave transferring connection between the core and the casings at the ends where permanent connection is not arranged, it is possible to adapt impact force and shock interval to the prevailing conditions, i.e. to the ground nature and the material of the pile to be driven down into the ground.
  • the rings 20 and 20' can be attached in different manners by means of screw connections, clamp connections or the like. It is important, however, that the ring is securely attached while it is at the same time possible to replace easily the ring.
  • the core 10 can form a shoulder facing downwards at the lower end of the core, said shoulder surrounding the impact surface 11 axially spaced therefrom.
  • the ring 2Q or 20' can be attached to the shoulder by means of screws which are passed through the ring to engage threaded bores in the shoulder.
  • the ring can also be attached to the casing 15 or the casing 19 as the case may be, by similar screw connections.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Structural Engineering (AREA)
  • Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Casting Devices For Molds (AREA)
  • Pinball Game Machines (AREA)
EP83850049A 1983-02-28 1983-02-28 Méthode pour contrôler la force d'impact et l'intervalle de choc dans les moutons à chute libre Expired EP0117382B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AT83850049T ATE42781T1 (de) 1983-02-28 1983-02-28 Verfahren zum kontrollieren der schlagkraft und des stossintervalls bei fallhaemmern.
EP83850049A EP0117382B1 (fr) 1983-02-28 1983-02-28 Méthode pour contrôler la force d'impact et l'intervalle de choc dans les moutons à chute libre
DE8383850049T DE3379795D1 (en) 1983-02-28 1983-02-28 Method of controlling impact force and shock interval in drop hammers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP83850049A EP0117382B1 (fr) 1983-02-28 1983-02-28 Méthode pour contrôler la force d'impact et l'intervalle de choc dans les moutons à chute libre

Publications (2)

Publication Number Publication Date
EP0117382A1 true EP0117382A1 (fr) 1984-09-05
EP0117382B1 EP0117382B1 (fr) 1989-05-03

Family

ID=8191618

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83850049A Expired EP0117382B1 (fr) 1983-02-28 1983-02-28 Méthode pour contrôler la force d'impact et l'intervalle de choc dans les moutons à chute libre

Country Status (3)

Country Link
EP (1) EP0117382B1 (fr)
AT (1) ATE42781T1 (fr)
DE (1) DE3379795D1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1784396B1 (de) * 1968-08-03 1971-07-01 Cordes Hugo Dipl Ing Rammhammer mit Schallschluckmantel
DE2237133A1 (de) * 1972-07-28 1974-02-14 Hugo Dipl Ing Cordes Rammhammer mit schalldaemmeinrichtung
DE2454488A1 (de) * 1974-11-16 1976-05-20 Koehring Gmbh Rammvorrichtung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1784396B1 (de) * 1968-08-03 1971-07-01 Cordes Hugo Dipl Ing Rammhammer mit Schallschluckmantel
DE2237133A1 (de) * 1972-07-28 1974-02-14 Hugo Dipl Ing Cordes Rammhammer mit schalldaemmeinrichtung
DE2454488A1 (de) * 1974-11-16 1976-05-20 Koehring Gmbh Rammvorrichtung

Also Published As

Publication number Publication date
EP0117382B1 (fr) 1989-05-03
DE3379795D1 (en) 1989-06-08
ATE42781T1 (de) 1989-05-15

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