EP0392311A1 - A method for pile-driving and a ram head for fixation of a hammer assembly in relation to a pile - Google Patents
A method for pile-driving and a ram head for fixation of a hammer assembly in relation to a pile Download PDFInfo
- Publication number
- EP0392311A1 EP0392311A1 EP90106281A EP90106281A EP0392311A1 EP 0392311 A1 EP0392311 A1 EP 0392311A1 EP 90106281 A EP90106281 A EP 90106281A EP 90106281 A EP90106281 A EP 90106281A EP 0392311 A1 EP0392311 A1 EP 0392311A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pile
- ram head
- edges
- impact piece
- driving
- 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
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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 present invention relates to a method for pile-driving and a ram head for fixation of a hammer assembly in relation to a pile to be driven by means of the hammer assembly.
- Pile-driving is a well-known technique for placing many different forms of foundations in the ground. Piles are today often made of concrete, and the production may take place under industrial conditions in a factory, and very effective machinery for pile-driving is available nowadays, so that the work can be carried out quickly and effectively on site.
- Modern pile-drivers are provided with a hammer assembly, or ram, and a slide guide, called the leader, which is arranged along the pile driving direction, for example vertically or almost vertically thereto.
- a modern and very effective hammer assembly comprises an elongate unit being placed on top of the pile in extension of the axis thereof, which unit by means of hydraulically supplied power throws an internal weight upwards and drops it to perform the ramming.
- the hammer assembly follows the pile downwards during the ramming, so that the drop height and frequency of the weight need not be dependent on the actual driving depth of the pile.
- the pile top must, of course, be guided in relation to the hammer assembly, so that the pile is hit squarely on the top, and this is suitably achieved by means of a sort of holding mechanism arranged in the form of a socalled ram head.
- a sort of holding mechanism arranged in the form of a socalled ram head.
- an intermediate plate or impact piece is placed between the hammer mechanism and the pile top, said intermediate plate or impact piece being of a material such as for example wood or plastic which may, to some degree, cushion the blows.
- the risk of displacement, angular deviation or turning furthermore has the effect that driven piles cannot readily be used for masts which must be positioned very accurately. If they were to be used for this purpose there would be a need for the possibility of adjusting or levelling by fastening of the mast which entails a further complication.
- the simplest way of mounting a mast in an adjustable manner is to provide the pile with upwardly projecting fixation elements, such as bolts, whereby the mast may be adjustably fastened. It is very difficult, however, to drive a pile if it is provided with bolts projecting from its top. There is an immediate risk of deforming or otherwise damaging the bolts.
- a ram head is provided for fixation of a hammer assembly in relation to a pile as stated in Claim 4. It is hereby achieved that a pile may be driven without damages, by using a very simple and cheap impact piece.
- a ram head for driving a pile having plane side faces at intervals and longitudinal edges as stated in Claim 6. It is hereby achieved that such a pile may be driven without any risk of damaging the side edges.
- a ram head is provided for use in connection with a pile having elements projecting from its top as stated in Claim 7. It is hereby achieved that such a pile may be driven without any risk of damaging the projecting elements and without any problems in connection with releasing the ram head from the pile top after driving.
- a ram head is furthermore provided as stated in Claim 8. It is hereby achieved that a pile of f. ex. quadrangular cross section may be placed in different angular orientations about its vertical axis and be driven under control of the orientation. This is suitable where there is a strong exigency of a very accurate pile orientation, such as for example by foundations for masts which must have a specific orientation and where the site for placing the pile driver cannot be freely chosen.
- This ram head is particularly suitable for pile drivers moving along and working from their position on rails.
- the ram head is made of steel of low hardness and low strength. Practical experiments have surprisingly shown that ram heads of such material in practice are more durable than ram heads of high strength steel having a tendency to crack during hammering. The reason herefor is not quite clear but is is assumed that it may be due to the fact that low strength steel is relatively vibration-absorbent.
- the ram head 106 is shown embracing a rectangular pile top, and it appears that the ram head has the form of a box with a bottom or hammer surface 107 lying above the pile and with side faces 108 extending downwardly along the pile sides for fixation of the pile.
- a usual impact piece or intermediate plate 100 is interposed between the hammer surface 107 and the pile top 101.
- the intermediate plate is practically so dimensioned that it may be hammered in position in the ram head 106 and may stick thereto without falling out, while the pile and the ram head are hoisted in position and are brought together.
- Fig. 3 shows a vertical sectional view of a ram head 110 according to an embodiment of the invention and in position above a pile 2 having upwardly projecting elements 105, f. ex. in the form of embedded bolts.
- This ram head has a bottom plate 125, and an impact piece 100 is placed between said bottom plate 125 and the pile top 101, said impact piece 100 being of f. ex. wood, preferably oak, or synthetic material, preferably nylon.
- the bottom plate is provided with a downwardly extending collar 126 enclosing the impact piece 100.
- This collar serves the purpose not only of holding the intermediate plate in its undeformed shape, but also of holding the impact piece 100 within its limits, even in the case of a severe deformation thereof.
- the impact impulses are only acting on the central area of the pile top, and not near the top edges 103.
- the pile may be driven without any damage of the top edges, if only the impact piece is of a suitable thickness and the length of the collar is adapted thereto, for example half the thickness of the impact piece.
- the collar may have the form of any closed, or substantially closed, outline, but preferably it is rectangular or circular.
- the bottom plate 125 is provided with openings 127 leaving free space around the bolts 105.
- the hammer assembly acts on the impact plate 121 being firmly mounted on top of the horizontal top section 120 which transmits the impact impulse to the bottom plate 125 through the body 122 being in the form of a cylindrical tube.
- this ram head is provided with guiding beams 128 mounted on the body 122 of said ram head and strengthened by welding to the bottom plate 125, extending downwardly around the pile which is secured by the contact pieces 129, as clearly apparent from Figure 4.
- These lateral guides secure the pile so that it can neither be displaced laterally nor rotate about its longitudinal axis, said lateral guides acting on contact faces on the pile sides 102 in distance from the side edges of the pile and in distance from the top edges of the pile. Practical experiments have shown extremely good results with this construction, as damaging of the pile edges and the pile as a whole can be avoided during driving.
- the contact pieces 129 are secured to the guide beams 128 by means of simple bolts 130, so that the contact pieces may be removed and for example be replaced by contact pieces of other dimensions, so that the guide may be adjusted to different pile dimensions.
- the ram head of this embodiment is made in two parts, i.e. a stationary part 111 (see Figure 6) and a part 112 being rotatable about the vertical, central axis.
- the stationary part 111 is firmly secured in relation to the hammer assembly (not shown) by appropriate securing of a projecting collar 113.
- the stationary part continues from the collar 113 downwards into a cylindrical body 116 having a supporting plate 114 mounted below.
- the entire stationary part is constructed in such a manner that it is dividable in a plane containing the longitudinal axis for ease of mounting and dismantling, and the two parts are held together by means of fish-plates 115.
- the rotatable part 112 is guided by sliding rings 119 and is supported by the supporting plate 114.
- the rotatable part also here comprises a top section 120 with an impact plate 121 on which the hammer acts.
- the top section is welded to the cylindrical body part 122.
- a number of radially projecting fins 124 are provided (see Figure 7) and below these fins a horizontal supporting flange 123 is mounted by means of which the rotatable part is supported on the supporting plate 114.
- the fins which are welded to the top section 120 and to the supporting flange 123 serve the purpose of partly supporting these parts and partly fixing the rotary orientation of the rotatable part in relation to the stationary part 111.
- eight fins define between themselves seven grooves having equal intervals, shown here with a pitch of 15° between them.
- two bushings 117 are provided at a mutual positional distance of 22,5°.
- a guide pin 118 with conical point may optionally be inserted and secured, said pin fitting into the interval between the fins.
- the rotatable part may thus by means of the two bushings 117 alternately be turned and fixed in a total of fourteen positions at intervals of each 7,5°, over an angular region of totally 105°.
- a further possibility of rotation can be achieved by raising the ram head from the pile and turn the rotatable part 90° in relation to the pile top and lower it again.
- the arrangement has in practice been found to be able to perfectly endure the impact actions, which is supposed to be due to the possibility of longitudinal displacement of the rotatable part in relation to the stationary part, so that the impact impulse is not transferred to the guide pin 118 or to the fins.
- the ram head is suitably made of steel of low hardness and preferably of steel type 37-2 according to DIN 17100 or ISO 630.
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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)
- Electrophonic Musical Instruments (AREA)
- Golf Clubs (AREA)
- Paper (AREA)
- Piles And Underground Anchors (AREA)
- Earth Drilling (AREA)
Abstract
Description
- The present invention relates to a method for pile-driving and a ram head for fixation of a hammer assembly in relation to a pile to be driven by means of the hammer assembly.
- Pile-driving is a well-known technique for placing many different forms of foundations in the ground. Piles are today often made of concrete, and the production may take place under industrial conditions in a factory, and very effective machinery for pile-driving is available nowadays, so that the work can be carried out quickly and effectively on site. Modern pile-drivers are provided with a hammer assembly, or ram, and a slide guide, called the leader, which is arranged along the pile driving direction, for example vertically or almost vertically thereto. A modern and very effective hammer assembly comprises an elongate unit being placed on top of the pile in extension of the axis thereof, which unit by means of hydraulically supplied power throws an internal weight upwards and drops it to perform the ramming. The hammer assembly follows the pile downwards during the ramming, so that the drop height and frequency of the weight need not be dependent on the actual driving depth of the pile. The pile top must, of course, be guided in relation to the hammer assembly, so that the pile is hit squarely on the top, and this is suitably achieved by means of a sort of holding mechanism arranged in the form of a socalled ram head. Normally, an intermediate plate or impact piece is placed between the hammer mechanism and the pile top, said intermediate plate or impact piece being of a material such as for example wood or plastic which may, to some degree, cushion the blows.
- It should be mentioned that there are limits to the accuracy with which piles may be placed so that certain disadvantages have to be accepted, such as slight displacements and angular deviations of the piles. Also, in the case of piles with longitudinal edges, f. ex. piles of rectangular shape, there is a risk of turning the pile during driving. Finally, in the case of piles made of a material of some friability, such as concrete, there is a risk of impact damages on the top which will disfigure the appearance of the pile, although it is normally possible to hit the piles so gently that the damages will be of no importance for the bearing capacity or strength of the pile. For this reason, driving of concrete piles is at present not very often used at places where the pile top will remain visible, and if, nevertheless, this technique is used, it is calculated that there will be a need for a refinishing of the pile top.
- The risk of displacement, angular deviation or turning furthermore has the effect that driven piles cannot readily be used for masts which must be positioned very accurately. If they were to be used for this purpose there would be a need for the possibility of adjusting or levelling by fastening of the mast which entails a further complication. The simplest way of mounting a mast in an adjustable manner is to provide the pile with upwardly projecting fixation elements, such as bolts, whereby the mast may be adjustably fastened. It is very difficult, however, to drive a pile if it is provided with bolts projecting from its top. There is an immediate risk of deforming or otherwise damaging the bolts. Experiments as to providing the ram head and impact piece with openings for projecting elements such as bolts, have for various reasons not been successful. One important reason is that the impact piece during ramming is severely deformed or crushed to such an extent that the impact piece must be renewed after each pile driving. It is, therefore, useless to provide openings in the impact piece as the latter is normally completely mashed, and thereby in practice forged onto the bolts, so that the ram head after ramming is stuck in the pile. It should be remarked that normally the ram head is of a relatively simple configuration, f. ex. having a plane impact surface and sides fitting around the pile top, as by more sophisticated configurations there will be a substantial risk that the ram head will crack or be broken during ramming.
- According to the invention a method as stated in Claim 1 is provided. It is hereby achieved that piles of a relatively friable material, such as concrete, can be driven without any damages to the top edges of the pile.
- According to the invention a method is provided for driving a pile having plane side faces at intervals and longitudinal side edges as stated in Claim 3. It is hereby achieved that such a pile can be driven without damage to the side edges, even if the pile material is relatively friable.
- According to the invention a ram head is provided for fixation of a hammer assembly in relation to a pile as stated in Claim 4. It is hereby achieved that a pile may be driven without damages, by using a very simple and cheap impact piece.
- According to the invention a ram head is provided for driving a pile having plane side faces at intervals and longitudinal edges as stated in
Claim 6. It is hereby achieved that such a pile may be driven without any risk of damaging the side edges. - According to the invention a ram head is provided for use in connection with a pile having elements projecting from its top as stated in
Claim 7. It is hereby achieved that such a pile may be driven without any risk of damaging the projecting elements and without any problems in connection with releasing the ram head from the pile top after driving. - According to the invention a ram head is furthermore provided as stated in
Claim 8. It is hereby achieved that a pile of f. ex. quadrangular cross section may be placed in different angular orientations about its vertical axis and be driven under control of the orientation. This is suitable where there is a strong exigency of a very accurate pile orientation, such as for example by foundations for masts which must have a specific orientation and where the site for placing the pile driver cannot be freely chosen. This ram head is particularly suitable for pile drivers moving along and working from their position on rails. - According to an advantageous embodiment the ram head is made of steel of low hardness and low strength. Practical experiments have surprisingly shown that ram heads of such material in practice are more durable than ram heads of high strength steel having a tendency to crack during hammering. The reason herefor is not quite clear but is is assumed that it may be due to the fact that low strength steel is relatively vibration-absorbent.
- The invention is more fully explained in the following with reference to preferred embodiments shown in the drawings, wherein
- FIG. 1 shows a vertical section through a pile top with a ram head according to the prior art,
- FIG. 2 shows a horizontal section through a pile top and the bottom part of a ram head according to the prior art,
- FIG. 3 shows a vertical section through a ram head according to the invention placed in position above a pile top,
- FIG. 4 shows a horizontal section through a pile top with elements of a ram head according to the invention,
- FIG. 5 shows a side view of a ram head according to another embodiment of the invention,
- FIG. 6 shows a side view corresponding to Fig. 5, but in direction perpendicular thereto,
- FIG. 7 shows a horizontal section through the top part of a ram head according to the invention, and
- FIG. 8 shows a horizontal section corresponding to Fig. 7, but at a lower position.
- Initially, the principle used in the prior art ram heads will be explained, reference being made to Figures 1 and 2. The
ram head 106 is shown embracing a rectangular pile top, and it appears that the ram head has the form of a box with a bottom orhammer surface 107 lying above the pile and withside faces 108 extending downwardly along the pile sides for fixation of the pile. A usual impact piece orintermediate plate 100 is interposed between thehammer surface 107 and thepile top 101. Although it does not appear from Fig. 1, the intermediate plate is practically so dimensioned that it may be hammered in position in theram head 106 and may stick thereto without falling out, while the pile and the ram head are hoisted in position and are brought together. With a ram head of this type the pile can be driven quickly and effectively, but in practice it has been found that in piles of a material of some brittleness or friability, such as concrete, there will be damages on thetop edge 103 of the pile and on thelongitudinal edges 104. From a cosmetic point of view these damages are very adverse, and upwardly open cracks may be formed which outdoors may give rise to problems, as water may seep down and cause frost bursting of the foundation. - In the following, various embodiments of the invention will be discussed with reference to Fig. 3 and the following Figures.
- Fig. 3 shows a vertical sectional view of a
ram head 110 according to an embodiment of the invention and in position above apile 2 having upwardly projectingelements 105, f. ex. in the form of embedded bolts. This ram head has abottom plate 125, and animpact piece 100 is placed between saidbottom plate 125 and thepile top 101, saidimpact piece 100 being of f. ex. wood, preferably oak, or synthetic material, preferably nylon. According to the invention the bottom plate is provided with a downwardly extendingcollar 126 enclosing theimpact piece 100. This collar serves the purpose not only of holding the intermediate plate in its undeformed shape, but also of holding theimpact piece 100 within its limits, even in the case of a severe deformation thereof. It is hereby achieved that the impact impulses are only acting on the central area of the pile top, and not near thetop edges 103. Experiments have shown that hereby the pile may be driven without any damage of the top edges, if only the impact piece is of a suitable thickness and the length of the collar is adapted thereto, for example half the thickness of the impact piece. The collar may have the form of any closed, or substantially closed, outline, but preferably it is rectangular or circular. - Furthermore, the
bottom plate 125 is provided withopenings 127 leaving free space around thebolts 105. The hammer assembly acts on theimpact plate 121 being firmly mounted on top of thehorizontal top section 120 which transmits the impact impulse to thebottom plate 125 through thebody 122 being in the form of a cylindrical tube. - In the following, another practical embodiment of the ram head according to the invention is explained with reference to Figures 4, 5, 6, 7, and 8 of the drawings. Those parts of the ram head of Figure 3 which are also found in the present embodiment are provided with the same reference numerals.
- As clearly apparent from Figures 5 and 6, this ram head is provided with guiding
beams 128 mounted on thebody 122 of said ram head and strengthened by welding to thebottom plate 125, extending downwardly around the pile which is secured by thecontact pieces 129, as clearly apparent from Figure 4. These lateral guides secure the pile so that it can neither be displaced laterally nor rotate about its longitudinal axis, said lateral guides acting on contact faces on the pile sides 102 in distance from the side edges of the pile and in distance from the top edges of the pile. Practical experiments have shown extremely good results with this construction, as damaging of the pile edges and the pile as a whole can be avoided during driving. Thecontact pieces 129 are secured to the guide beams 128 by means ofsimple bolts 130, so that the contact pieces may be removed and for example be replaced by contact pieces of other dimensions, so that the guide may be adjusted to different pile dimensions. - The ram head of this embodiment is made in two parts, i.e. a stationary part 111 (see Figure 6) and a
part 112 being rotatable about the vertical, central axis. Thestationary part 111 is firmly secured in relation to the hammer assembly (not shown) by appropriate securing of a projectingcollar 113. The stationary part continues from thecollar 113 downwards into acylindrical body 116 having a supportingplate 114 mounted below. The entire stationary part is constructed in such a manner that it is dividable in a plane containing the longitudinal axis for ease of mounting and dismantling, and the two parts are held together by means of fish-plates 115. Therotatable part 112 is guided by slidingrings 119 and is supported by the supportingplate 114. As mentioned in connection with the embodiment of Figure 3, the rotatable part also here comprises atop section 120 with animpact plate 121 on which the hammer acts. The top section is welded to thecylindrical body part 122. - Just below the top section 120 a number of radially projecting
fins 124 are provided (see Figure 7) and below these fins a horizontal supportingflange 123 is mounted by means of which the rotatable part is supported on the supportingplate 114. The fins which are welded to thetop section 120 and to the supportingflange 123 serve the purpose of partly supporting these parts and partly fixing the rotary orientation of the rotatable part in relation to thestationary part 111. As shown in Figure 7, eight fins define between themselves seven grooves having equal intervals, shown here with a pitch of 15° between them. In the stationary part twobushings 117 are provided at a mutual positional distance of 22,5°. In these bushings aguide pin 118 with conical point may optionally be inserted and secured, said pin fitting into the interval between the fins. As appears from Figure 7, the rotatable part may thus by means of the twobushings 117 alternately be turned and fixed in a total of fourteen positions at intervals of each 7,5°, over an angular region of totally 105°. Of course, a further possibility of rotation can be achieved by raising the ram head from the pile and turn the rotatable part 90° in relation to the pile top and lower it again. The arrangement has in practice been found to be able to perfectly endure the impact actions, which is supposed to be due to the possibility of longitudinal displacement of the rotatable part in relation to the stationary part, so that the impact impulse is not transferred to theguide pin 118 or to the fins. - The ram head is suitably made of steel of low hardness and preferably of steel type 37-2 according to DIN 17100 or ISO 630.
Claims (10)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DK1733/89 | 1989-04-11 | ||
DK173389A DK165797C (en) | 1989-04-11 | 1989-04-11 | PROCEDURE FOR FRAMING THE PAEL AND FRAME HEAD FOR FIXING THE HAMMER MECHANISM IN RELATION TO A PAEL |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0392311A1 true EP0392311A1 (en) | 1990-10-17 |
EP0392311B1 EP0392311B1 (en) | 1994-08-10 |
Family
ID=8107623
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90106281A Expired - Lifetime EP0392311B1 (en) | 1989-04-11 | 1990-04-02 | A method for pile-driving and a ram head for fixation of a hammer assembly in relation to a pile |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0392311B1 (en) |
AT (1) | ATE109849T1 (en) |
DE (1) | DE69011383T2 (en) |
DK (2) | DK165797C (en) |
ES (1) | ES2021567T3 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0984105A1 (en) | 1998-08-31 | 2000-03-08 | Per Aarsleff A/S | Positioning assembly for a ram head |
WO2010072772A1 (en) | 2008-12-23 | 2010-07-01 | Centrum Paele A/S | Pile extension |
WO2012010131A3 (en) * | 2010-06-09 | 2013-06-06 | Schletter Gmbh | Impact piece for a pile driver |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL9101294A (en) * | 1991-07-24 | 1993-02-16 | Waal Technology & Consultancy | METHOD AND APPARATUS FOR DRIVING PIPES |
EP0777018A1 (en) | 1995-12-01 | 1997-06-04 | Per Aarsleff A/S | A method of producing a concrete encasing in the ground, an apparatus for producing a concrete encasing within a hole in the ground, and a concrete encasing provided within a hole in the ground |
AT17067U1 (en) * | 2020-03-05 | 2021-04-15 | European Trans Energy Gmbh | Driven pile |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB191126073A (en) * | 1911-11-22 | 1912-07-25 | Yorkshire Hennebique Contracti | Improvements in Helmets for use in the Driving of Reinforced Concrete Piles. |
DE659274C (en) * | 1938-04-29 | Demag Akt Ges | Ramming device | |
US2931186A (en) * | 1958-02-05 | 1960-04-05 | Mckiernan Terry Corp | Pile drive cap |
GB1409188A (en) * | 1973-10-31 | 1975-10-08 | Foundations Patent Investment | Pile hood for vibratory pile driving |
US4479552A (en) * | 1983-03-08 | 1984-10-30 | Conmaco, Inc. | Pile driving cap block cushion |
US4653595A (en) * | 1985-08-28 | 1987-03-31 | Soloco, Inc. | Method and apparatus for remote release of hammer and follow block chain connection |
WO1988005844A1 (en) * | 1987-02-04 | 1988-08-11 | Delmag Maschinenfabrik Reinhold Dornfeld Gmbh & Co | Silencer for pile rammers |
-
1989
- 1989-04-11 DK DK173389A patent/DK165797C/en not_active IP Right Cessation
-
1990
- 1990-04-02 EP EP90106281A patent/EP0392311B1/en not_active Expired - Lifetime
- 1990-04-02 DK DK90106281.0T patent/DK0392311T3/en active
- 1990-04-02 ES ES90106281T patent/ES2021567T3/en not_active Expired - Lifetime
- 1990-04-02 DE DE69011383T patent/DE69011383T2/en not_active Expired - Fee Related
- 1990-04-02 AT AT90106281T patent/ATE109849T1/en not_active IP Right Cessation
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE659274C (en) * | 1938-04-29 | Demag Akt Ges | Ramming device | |
GB191126073A (en) * | 1911-11-22 | 1912-07-25 | Yorkshire Hennebique Contracti | Improvements in Helmets for use in the Driving of Reinforced Concrete Piles. |
US2931186A (en) * | 1958-02-05 | 1960-04-05 | Mckiernan Terry Corp | Pile drive cap |
GB1409188A (en) * | 1973-10-31 | 1975-10-08 | Foundations Patent Investment | Pile hood for vibratory pile driving |
US4479552A (en) * | 1983-03-08 | 1984-10-30 | Conmaco, Inc. | Pile driving cap block cushion |
US4653595A (en) * | 1985-08-28 | 1987-03-31 | Soloco, Inc. | Method and apparatus for remote release of hammer and follow block chain connection |
WO1988005844A1 (en) * | 1987-02-04 | 1988-08-11 | Delmag Maschinenfabrik Reinhold Dornfeld Gmbh & Co | Silencer for pile rammers |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0984105A1 (en) | 1998-08-31 | 2000-03-08 | Per Aarsleff A/S | Positioning assembly for a ram head |
WO2010072772A1 (en) | 2008-12-23 | 2010-07-01 | Centrum Paele A/S | Pile extension |
EP2204498A1 (en) | 2008-12-23 | 2010-07-07 | Centrum Pæle A/S | Pile extension |
WO2012010131A3 (en) * | 2010-06-09 | 2013-06-06 | Schletter Gmbh | Impact piece for a pile driver |
Also Published As
Publication number | Publication date |
---|---|
ES2021567A4 (en) | 1991-11-16 |
DK165797B (en) | 1993-01-18 |
EP0392311B1 (en) | 1994-08-10 |
DK165797C (en) | 1993-06-21 |
DE69011383D1 (en) | 1994-09-15 |
DK173389D0 (en) | 1989-04-11 |
DK173389A (en) | 1990-10-12 |
ES2021567T3 (en) | 1994-11-01 |
DE69011383T2 (en) | 1994-12-15 |
DK0392311T3 (en) | 1994-10-03 |
ATE109849T1 (en) | 1994-08-15 |
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