EP0038311A2 - Pfahleintreibvorrichtungen - Google Patents

Pfahleintreibvorrichtungen Download PDF

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Publication number
EP0038311A2
EP0038311A2 EP81850061A EP81850061A EP0038311A2 EP 0038311 A2 EP0038311 A2 EP 0038311A2 EP 81850061 A EP81850061 A EP 81850061A EP 81850061 A EP81850061 A EP 81850061A EP 0038311 A2 EP0038311 A2 EP 0038311A2
Authority
EP
European Patent Office
Prior art keywords
drop hammer
pile
segments
weight segments
weight
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.)
Ceased
Application number
EP81850061A
Other languages
English (en)
French (fr)
Other versions
EP0038311A3 (de
Inventor
John Ragnar Johansson
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.)
Goteborgs Betongpalar AB
Original Assignee
Goteborgs Betongpalar 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 Goteborgs Betongpalar AB filed Critical Goteborgs Betongpalar AB
Publication of EP0038311A2 publication Critical patent/EP0038311A2/de
Publication of EP0038311A3 publication Critical patent/EP0038311A3/de
Ceased 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
    • 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 present invention relates to pile driving machines of the kind which by means of a drop hammer ram down piles into the ground.
  • a problem connected with pile-driving operations is the crushing and breaking damages to which the piles are sometimes exposed when they are being subjected to the impacts from the drop hammer.
  • One cause of damages of this kind is that the kinetic energy of the drop hammer, which may be considerable, is momentarily released when the hammer hits the pile.
  • Another reason is that the tip of the pile penetrates a high-density section of the ground.
  • One method of limiting damages to the piles is to protect the heads thereof with an impact-absorbing pad made from e.g. hard wood.
  • the pad is capable of protection only against direct crushing damages from impact on the upper part of the pile. So far, it has net been possible to solve as easily the problems of breaking damages.
  • By measuring the pressure wave propagated from the drop hammer down to the pile one has found that it is favourable to reduce the force of impact on the pile and instead prolong the space of time during which the force acts on the pile.
  • the pads have been further developed and provided with spring means which are compressed at the moment of im- .pact and thus prolong the time factor of each operative stroke.
  • Resilient pads of this type usually comprise a large number of cup springs (often about 40) which must be covered with some lubricating medium in order to provide the desired resilient compression.
  • the resilient pads thus comprise a large number of parts which must cooperate in order to give the desired effect and which must also be provided with means allowing the spring units to be biased. For these reasons the length of the pad usually considerably exceeds 1 meter. The great length is a. disadvantage, since it limits the length of the drop--hammer stroke, at least in the initial stage of the driving--down of each pile section.
  • the device in accordance with the subject invention is intended to utilize more efficiently the kinetic energy of the drop hammer and to reduce to a minimum the vertical dimensions of the pad.
  • the drop hammer comprises two or several superposed weight segments which are arranged against the action of spring means, such as resilient portions of the segments, to be drawn together as a result of their velocity energy when hitting the pile, and in that this velocity energy is adjustable by control of the bias of the spring means with the aid of connecting rods passing through the weight segments.
  • the pile-driving machine illustrated in Fig. 1 is mounted on a track-laying vehicle 1 which is provided with means to operate a pile-driving mast 2 and a drop hammer 3.
  • the latter is displaceable in guides in the mast 2.
  • Driving--down of a pile 4 into the ground is generally effected in the following mannur: a hoisting mechanism lifts the drop hammer 3 over some distance, inside the mast ,whereafter the drop hammer is allowed to fall onto the head of the pile.
  • the diagram in fig. 2 shows the variations of the force of impact immediately after the drop hamme has hit the pile.
  • the line of dashes 5 represents the force of impact effected by conventional drop hammers provided with pads of hard wood. As apparent from the diagram,the force of impact increases to a maximum value 6, whereupon it falls to a minimum value which corresponds to the dead load of the drop hammer.
  • the continuous line 7 represents the force of impact effected by a drop hammer in accordance with the subject invention.
  • the drop hammer in accordance with the invention is provided with resilient means.
  • the force of impact of a drop hammer of this kind increases to a plateau value 8 which lasts for a while and then drops again to the minimum value.
  • the force of impact is not of the same magnitude as when drop hammers of conventional design are used; instead, it lasts over a longer period of time. This means that the driving--down movement of the pile is accelerated at a slower pace at the moment of impact but that the acceleration continues for a longer period of time.
  • the strain on the pile therefore will be smaller, when a drop hcunmer according to curve 7 is used, despite the higher driving efficiency developed by such hammers.
  • the drop hammer illustrated in Fig. 3 which is displaceable along the mast along guide muans 9, consists of a number of weight segments 10 which are held together in spaced relationship by spring members 11.
  • these spring members consist of cup springs 12 which are positioned rim--to-rim in pairs between each weight segment and which are retained in position at thu centre of the weight segments 10 by bolt joining members 13.
  • the weight segments 10 are interconnected-by connecting rods 14 which allow adjustment of the bias of the cup springs 12. Owing to this possibility of adjustment it becomes possible to adapt the curve 7 to the prevailing circumstances und the materials used.
  • the drop hammer is provided with end pieces 15 and 16.
  • the upper end piece is provided centrally with a lifting loop 17 to which a hoisitng wire 18 may be secured.
  • the drop hammer illustrated in Fig. 4 like the hammer in accordance with the previous embodiment, is provided with weight segments 10, connecting rods 14 and end pieces 15 and 16.
  • the spring members are not however, cup springs; instead the springiness is obtained through indentations 19 and 20 which are formed in the weight segments proper in diametrically overlapping positions and impart to each weight segment a certain resilient deformability.
  • the lower end piece 16 of the drop hammer 3 is illustrated in Fig. 4 in abutting position against an impact pad 21 which is arranged for sliding movement relative to the mast 2 with the aid of guide means 22.
  • the impact pad 21 forms the impact area on which the hammer drops and is provided with a protective plate 23 which is made e.g. from laminated wood fibre board and which is designed to protect the upper end of the pile 4.
  • the pad 21 is also provided with a conically inwards inclining edge wall 24 which serves to guide the pile, ensuring that the latter remains in line with the direction of impact of the drop hammer.
  • the drop hammer shown in Fig. 5 is provided with weight segments 10 and spring members 11.
  • the drop hammer in accordance with this embodiment is formed in one integral piece, having no separate end pieces.
  • At least two portions 25 and 26 of the drop hammer are formed with notches 27 which extend from diametrically opposite sides of the hammer at right angles to the longitudinal axis thereof, being distributed vertically-along the drop hammer and spaced equal distances apart vertically but displaced in pitch, so that the notches on one side will be located between the notches formed on the opposite side.
  • the notches on both sides extend beyond the centre line of the drop hammer such that they will overlap as illustrated.
  • the spring members 12 in a variety of ways within the scope of the subject invention, depending on the resilience properties aimed at.
  • a comparatively non-yielding resilient drop hammer may be suitable in pile-driving operations in porous earth strata, whereas a more resilient and springy drop hammer might be more useful in more compact and solid earth strata.
  • the subject invention makes it possible to utilize more efficiently the velocity energy of drop hammers while at the same time safe-guarding against bending and crushing damages to the pile.
  • the weight segments as well as the spring members may be designed differently.
  • the drop hammer may be operated hydraulically instead of by a wire 18 fastened in a hook.
  • the means guiding the drop hammer and the impact pad may be arranged in other ways than shown and described.
  • the drop hammer may be arranged to operate in a cage which is mounted for sliding movement along the mast 2 and the bottom of which forms the member of pile impact.

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)
EP81850061A 1980-04-10 1981-04-03 Pfahleintreibvorrichtungen Ceased EP0038311A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8002704A SE8002704L (sv) 1980-04-10 1980-04-10 Anordning vid palningsmaskiner
SE8002704 1980-04-10

Publications (2)

Publication Number Publication Date
EP0038311A2 true EP0038311A2 (de) 1981-10-21
EP0038311A3 EP0038311A3 (de) 1981-11-25

Family

ID=20340713

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81850061A Ceased EP0038311A3 (de) 1980-04-10 1981-04-03 Pfahleintreibvorrichtungen

Country Status (3)

Country Link
EP (1) EP0038311A3 (de)
JP (1) JPS56159423A (de)
SE (1) SE8002704L (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2598882A1 (fr) * 1986-05-22 1987-11-27 Dagnaud Motoculture Service Sa Dispositif d'enfoncement de pieux dans les sols.
EP0525865A1 (de) * 1991-07-24 1993-02-03 DE WAAL TECHNOLOGY & CONSULTANCY B.V. Verfahren und Vorrichtung zum Eintreiben von Pfählen
EP0733740A1 (de) * 1995-03-17 1996-09-25 APPLICATION OF CLEANING TECHNIQUES ON SOILS, in het kort SOILS Rammgewicht für dynamisches Verdichten von zusammendrückbaren Materialien
FR2776385A1 (fr) * 1998-03-18 1999-09-24 Oxycoupage Et Soudure De Champ Dispositif de gueuses pour essais de controle d'engins de levage hydrauliques ou autres
NL1021995C2 (nl) * 2002-11-27 2004-05-28 Waal Technology & Consultancy Hei-inrichting in het bijzonder geschikt voor heien bij een beperkte beschikbare hoogte.

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6250519A (ja) * 1985-08-27 1987-03-05 Nippon Koatsu Concrete Kk コンクリ−ト杭の杭頭保護装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2812745A (en) * 1951-02-20 1957-11-12 Atlas Copco Ab Hammer pistons and tools provided therewith
US3245482A (en) * 1962-06-22 1966-04-12 Composite Piling And Foundatio Pile driving hammers
US3823786A (en) * 1973-05-15 1974-07-16 B Voitsekhovsky Impact body of a hammer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2812745A (en) * 1951-02-20 1957-11-12 Atlas Copco Ab Hammer pistons and tools provided therewith
US3245482A (en) * 1962-06-22 1966-04-12 Composite Piling And Foundatio Pile driving hammers
US3823786A (en) * 1973-05-15 1974-07-16 B Voitsekhovsky Impact body of a hammer

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2598882A1 (fr) * 1986-05-22 1987-11-27 Dagnaud Motoculture Service Sa Dispositif d'enfoncement de pieux dans les sols.
EP0525865A1 (de) * 1991-07-24 1993-02-03 DE WAAL TECHNOLOGY & CONSULTANCY B.V. Verfahren und Vorrichtung zum Eintreiben von Pfählen
EP0733740A1 (de) * 1995-03-17 1996-09-25 APPLICATION OF CLEANING TECHNIQUES ON SOILS, in het kort SOILS Rammgewicht für dynamisches Verdichten von zusammendrückbaren Materialien
FR2776385A1 (fr) * 1998-03-18 1999-09-24 Oxycoupage Et Soudure De Champ Dispositif de gueuses pour essais de controle d'engins de levage hydrauliques ou autres
NL1021995C2 (nl) * 2002-11-27 2004-05-28 Waal Technology & Consultancy Hei-inrichting in het bijzonder geschikt voor heien bij een beperkte beschikbare hoogte.

Also Published As

Publication number Publication date
EP0038311A3 (de) 1981-11-25
SE8002704L (sv) 1981-10-11
JPS56159423A (en) 1981-12-08

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Inventor name: JOHANSSON, JOHN RAGNAR