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EP0185435A1 - Casque de battage de pieux pour la transmission des forces entre un mouton et un pieu - Google Patents

Casque de battage de pieux pour la transmission des forces entre un mouton et un pieu Download PDF

Info

Publication number
EP0185435A1
EP0185435A1 EP85202107A EP85202107A EP0185435A1 EP 0185435 A1 EP0185435 A1 EP 0185435A1 EP 85202107 A EP85202107 A EP 85202107A EP 85202107 A EP85202107 A EP 85202107A EP 0185435 A1 EP0185435 A1 EP 0185435A1
Authority
EP
European Patent Office
Prior art keywords
piling
rods
pile
piling cap
hammer
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Withdrawn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
EP85202107A
Other languages
German (de)
English (en)
Inventor
Johannis De Wit
Henk Van Koten
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.)
FUGRO CONSULTANTS INTERNATIONAL BV
Original Assignee
FUGRO CONSULTANTS INTERNATIONAL BV
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 FUGRO CONSULTANTS INTERNATIONAL BV filed Critical FUGRO CONSULTANTS INTERNATIONAL BV
Publication of EP0185435A1 publication Critical patent/EP0185435A1/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Withdrawn legal-status Critical Current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
    • E02D13/00—Accessories for placing or removing piles or bulkheads, e.g. noise attenuating chambers
    • E02D13/10—Follow-blocks of pile-drivers or like devices

Definitions

  • the invention relates to a piling cap for the transmission of force between a piling hammer and a pile, said piling cap comprising a quantity of shock absorption material to be stressed by the piling hammer, said shock absorption material being provided with a number of plastic rods whose centre line is parallel to the direction of the strokes to be carried out, as known from WO-A-8,101,262.
  • piling cap The purpose of a piling cap is to protect both piling hammer and pile against excessive stress peaks. It is known to use wood or plastic as shock absorption material in piling caps. Wood is in the initial stage too soft, so that a relatively large amount of energy is absorbed. During the pile-driving, the wood is compressed to an increasingly solid mass, which leads to peak stresses which are too high occurring and the head of the pile being damaged. Besides, the wood can catch fire. An attempt was made to eliminate these disadvantages by replacing the wood in the piling cap by a piece of polypenko plastic. It was, however, found that high internal stresses occur in the solid piece of plastic during the pile-driving, and that as a result of this the plastic ages quickly and the service life becomes unacceptably short.
  • ⁇ ⁇ hich is a cap filled with oil and pressurized gas fastened under the piling hammer.
  • the gas pressure is increased in such a way that a high pressurizing force (e.g. 1,000 kN) is produced, and through exceeding of this value during the pile driving stroke the gas is compressed. In this way the level of the force transmission can be limited and the duration thereof can be extended.
  • the stresses occurring can be influenced by the pressurizing. Nevertheless, the stress curve first shows an inadmissible peak before the pressure levels off.
  • the object of the invention is to avoid the disadvantages ' of known piling caps and to produce a piling cap which can absorb a high peak stress without problems, while still exhibiting a low modulus of elasticity.
  • the piling cap is to this end characterized in that the rods are held at a distance from each other through the fact that they project through the holes of at least one perforated plate, while between the rods such free spaces exist that they can deform freely under stress.
  • the total volume of plastic material needed is theoretically calculated from, inter alia, the weight of the piling hammer, the height of fall thereof, the weight of the pile, and the ground resistance to be overcome. This volume is divided into a number of relatively thin rods made from a carefully selected material which can take high stress and exhibits a low modulus of elasticity.
  • the preferred material is nylon.
  • the piling cap according to the invention will pass on the stroke energy transmitted by the piling hammer over a relatively long period of time, essentially without any peak, to the pile, which is, as it were, pushed into the ground, instead of being driven.
  • the plastic rods will in the process thicken between their clamping points and subsequently return to their initial shape. It can happen that apart from rods made of nylon (polyamide), rods made of a second type of plastic (for example, high-density polyethylene) have to be used in order to transmit the stroke energy to the pile without peak stresses.
  • the piling cap according to the above-mentioned publication WO-A-8 101 262 does not display the effect according to the invention: that the energy transmitted by the piling hammer is passed on to the pile essentially without peak stresses, because no free spaces exist between the rods in such a way that they can deform freely under stress.
  • the rods In order to enclose the rods inside the cap in such a way that a piling hammer can transmit its energy to all rods without direct contact with the rods, the rods rest on a strike plate, onto which is welded a ring which is telescopically surrounded by a guard which rests on the top ends of the rods.
  • a bottom perforated plate preferably rests on short tubular pieces which are fastened to the strike plate, while a top perforated plate is fastened by longer tubular pieces to the bottom perforated plate.
  • a guide ring for the top of a pile can be attached under the strike plate.
  • the shield can be provided with two guides, into each of which a part projecting upwards from the strikeplate is conveyed.
  • Fig. 1 shows a common piling frame with two guides 1, 2, a piling hammer 3 which is conveyed between those guides and which can be drawn upwards by means of a winch cable 4 (piling strap), and a piling cap 6 which rests on a pile 5 and which transmits the stroke energy of the free-falling piling hammer to the pile.
  • a winch cable 4 piling strap
  • the invention is concerned with the design of the piling cap;- other pile driving plants are also possible.
  • the piling cap 6 comprises a strike plate 7 with a downward- extending ring 8 which falls round the top of the piling plate 5, and an upward-extending ring 9 over which a shield 11 is disposed in telescopically slidable fashion.
  • This shield 11 rests on a set of plastic rods 12 of equal length.
  • the rods each project through a hole of two perforated plates 13, 14 and are thus held at a distance from one another.
  • the bottom perforated plate 13 rests on three short tubular pieces 15 which are welded onto the strike plate.
  • the top perforated plate 14 is attached to the bottom one by means of three longer tubular pieces 16.
  • two upward-projecting parts 17 are welded onto the strike plate diagonally opposite each other, and are each passed between two lugs 18 of the shield 11.
  • the strike plate 7 has two projections 19 which are disposed diametrically opposite each other and are conveyed into recesses of the guides 2 of the piling frame.
  • the plastic from which the rods 12 are made must have a low modulus of elasticity and must be able to absorb a high peak stress and release it relatively slowly.
  • Polyamide nylon 6
  • rods made of two different plastic materials for example nylon and high-density polyethylene, are used in one and the same piling cap.
  • the internal friction during deformation will be reduced to a minimum.
  • the rods must not buckle, and the energy from the piling hammer will have to be absorbed within the elastic range by the rods, without the admissible stress in the plastic being exceeded.
  • the plastic must exhibit little or no creep under stress.
  • the diameter of the rods is, for example, 50 mm and the length 300 mm. These values can be varied, depending on requirements.
  • the plastic filling of the piling cap does not consist of one single solid piece, but is divided into a number of rods which are arranged with their centre line according to the direction of striking parallel to each other and spaced from one another.
  • nylon is particularly important as a material for the plastic rods, because this material hardly ages at all and lasts for a very long time. Rods made of this material essentially meet the theoretical requirement that a peak stress exerted upon them is gradually passed on to the pile without peak. Fewer strokes of the hammer are therefore needed to work a pile into the ground, and the height of the hammer is reduced.

Landscapes

  • Engineering & Computer Science (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)
  • Structural Engineering (AREA)
  • Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
EP85202107A 1984-12-18 1985-12-18 Casque de battage de pieux pour la transmission des forces entre un mouton et un pieu Withdrawn EP0185435A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8403839 1984-12-18
NL8403839A NL186188C (nl) 1984-12-18 1984-12-18 Heimuts.

Publications (1)

Publication Number Publication Date
EP0185435A1 true EP0185435A1 (fr) 1986-06-25

Family

ID=19844932

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85202107A Withdrawn EP0185435A1 (fr) 1984-12-18 1985-12-18 Casque de battage de pieux pour la transmission des forces entre un mouton et un pieu

Country Status (2)

Country Link
EP (1) EP0185435A1 (fr)
NL (1) NL186188C (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020080695A (ko) * 2001-04-17 2002-10-26 이현아 항타기용 완충구

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL131421C (fr) * 1900-01-01
GB1421862A (en) * 1973-03-05 1976-01-21 Hollandsche Betongroep Nv Pile cap unit
NL7704561A (en) * 1977-04-26 1978-10-30 Koninkl Nederhorst Bouw B V Pile driving cap with elastic buffer - has thin buffer between tapering tubes on common lengthwise axis
WO1981001262A1 (fr) * 1979-10-31 1981-05-14 L Frederick Bloc amortisseur pour marteau pilon

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL131421C (fr) * 1900-01-01
GB1421862A (en) * 1973-03-05 1976-01-21 Hollandsche Betongroep Nv Pile cap unit
NL7704561A (en) * 1977-04-26 1978-10-30 Koninkl Nederhorst Bouw B V Pile driving cap with elastic buffer - has thin buffer between tapering tubes on common lengthwise axis
WO1981001262A1 (fr) * 1979-10-31 1981-05-14 L Frederick Bloc amortisseur pour marteau pilon

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020080695A (ko) * 2001-04-17 2002-10-26 이현아 항타기용 완충구

Also Published As

Publication number Publication date
NL186188C (nl) 1990-10-01
NL186188B (nl) 1990-05-01
NL8403839A (nl) 1986-07-16

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19861230

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Inventor name: DE WIT, JOHANNIS

Inventor name: VAN KOTEN, HENK