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
  • E02D7/10—Power-driven drivers with pressure-actuated hammer, i.e. the pressure fluid acting directly on the hammer structure
• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
  • E02D11/00—Methods or apparatus specially adapted for both placing and removing sheet pile bulkheads, piles, or mould-pipes
• • E—FIXED CONSTRUCTIONS
  • E21—EARTH OR ROCK DRILLING; MINING
  • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
  • E21B7/00—Special methods or apparatus for drilling
  • E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes

Definitions

• the invention relates to a hammering device comprising a body, from which the device can be connected, for instance, to a working machine, a stroke-transmitting piece in the body taking the strokes of a moving and hammering mass and transmitting the strokes to a pile or similar to be hammered into or pulled up from the ground, or to a tool, in which device between the piece and the pile and the tool a clamp is applied, by means of which the pile or tool is grasped.
• the hammering device as per the invention is characterized in that the device includes mass moving motion cylinders, by means of which the mass back motion can be carried out conducting liquid pressure to have an effect on the cylinder piston on the primary side of the cylinders, and by means of which cylinders the mass impact motion can be carried out compress sing the gas on the secondary side of the cylinders to wanted pressure by means of fluid pressure conducted to the primary side, whereby striking motion can be produced in discharging the liquid pressure from the primary side- of the cylinders.
• the advantage of the hammering device as per this invention is t hat the hammering energy is easily regulated to a wanted value. Regulation is possible even by remote control. Acceleration of mass takes place optimally. Into the cylinder that causes the striking motion no medium at all is conducted, so the motion gets fast, when in the cylinder swelling of high-pressure gases only takes place during back motion. The inconvenient vibrations of the device can be made reduced, when the cylinder piston is by the force of primary side liquid pressure forced to compress the gas space into a smaller size and to increase its pressure. In the final stage of compression it easy to make the piston motion slower by valve control and not only the slowing due to this in the final stage of back motion does hardly lengthen the time spent for back motion. There are hammering tools easily attachable to the clamping means instead of piles.
• Figure 1 shows the device cross-cut from one side hammering a pile into the ground.
• Figure 2 shows the device cross-cut from one side hammering a pile up from the ground.
• Figure 3 shows increase of pressure on cylinder secondary side as function of the piston.
• Figure 4 shows a secondary mass moving inside the piston.
• Figure 1 is a hammering device fixed to the boom head of an excavator, which assembly is made by means of fixing components 12 included in the device.
• the hammering device comprises a body 1 and inside it a hammer gear is arranged by means of damping/flexible elements 3.
• the hammering machine has a mass 2 and cylinders 8 moving it.
• the other cylinder ends are fixed to the body connection beam 21 and the other ends to mass 2.
• In the other mass end there- is a striking surface 18 hammering striking surface 19 of counter piece 5.
• Counter piece 5 has a clamping device 6 working by wedge principle in a manner known per se, which tightens around pile 7.
• Clamping device 6 can, for instance, be opened and tightened by a hydraulic arrangement, whereby change of grip in the pile, detachments and fixings can be easily done from the cabin.
• piece 5 has a clamping device 6 working by wedge principle in a manner known per se, which tightens around pile 7.
• Clamping device 6 can, for instance, be opened and tightened by a hydraulic arrangement, whereby change of grip in the pile, detachments and fixings can be easily done from the cabin.
• a steering pipe 9 is placed between parts 21 and 5.
• To the primary side 20 of the cylinders medium is conducted along line 14 in order to lift up the mass after stroke.
• the gas filling is, for instance, nitrogen and compressed to high pressure depending on distance s, which the piston travels.
• control unit 17 it has, for instance, been possible to determine beforehand to what pressure the primary side is restricted during back motion, where by a certain pressure is formed even on the secondary side of the cylinders. Pressure can be measured even from the secondary side and information transmitted to control unit 17. From valve arrangement
• control unit 17 control or by means of pressure measured from secondary side.
• control unit 17 it is possible to choose how far (distance s) the mass is returned for stroke.
• Pressure produced by hammering to the secondary side of cylinder is determined on basis of the return travel s length. According to figure 3 pressure P on secondary side grows as the travel gets longer. Filling beforehand (e.g. nitrogen) on secondary side is Pe. Wanted hammering energy is received defining how far the mass is conducted by means of pressure fluid.
• the pressure to be fed to primary side can be allowed to rise before the mass back motion is stopped.
• an exit for pressure fluid is opened, where by the secondary side gas pressure suddenly pushes piston 16 and then also the piston rod out, while mass 2 moves the same distance.
• the impact energy is E.
• control centre 17 By means of control centre 17 the position of mass 2 is observed and manipulated by means of detectors 10 and 11 and by the pressure detector in line 14, which is the pressure to be fed to primary side 20 and equal also to the primary side pressure when it's not the question of stroke motion. It is possible to check from line 14 pressure prevailing on primary side.
• control unit 17 gives valve an impulse to change direction of flow for the stroke.
• Pressure valve is most suitably set from the cabin by remote control, whereby the size of stroke is easy to choose for each situation.
• Figure 2 shows a hammering device in an alternative way i.e. turned 180°, for instance in an excavator boom, whereby piles are hammered up from the ground. It is possible to manage with one clamping piece and clamping component arrangement 6. By means of the excavator boom it is possible to maintain pre-pressure in the pile by lifting the device upward by means of the boom with proper force uninterruptedly. Likewise pre-pressure downward is maintained in hammering piles into the ground. Pre-pressure force is transmitted over damping rubbers 3,4 and its size must be restricted in order to avoid leakage of rubbers. If intensification of strokes is required, it is possible to arrange inside mass 2 a moving mass 17 and for it a space for moving greater than the volume required by mass 17.
• mass 17 has distance d, and after having done it, it dashes against the end of its space. This collision takes place with minor delay of in regard to the collision with mass 2 counterpart 5.
• the double stroke intensifies the stroke effect of the mass.
• Mass 17 can be in solid form, liquid or heavy granulate. Double stroke takes place with the device hammering both downward and upward.
• cylinders 8 are on mass outside, they can also be closer to steering pipe 9 and from their other end fixed to mass 2 end. Then the device becomes as to its diameter clearly smaller if body 1 is, for instance, a pipe. Indeed, the structural height grows a little.

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• Engineering & Computer Science (AREA)
• Life Sciences & Earth Sciences (AREA)
• Mining & Mineral Resources (AREA)
• General Life Sciences & Earth Sciences (AREA)
• General Engineering & Computer Science (AREA)
• Civil Engineering (AREA)
• Paleontology (AREA)
• Structural Engineering (AREA)
• Geology (AREA)
• Physics & Mathematics (AREA)
• Environmental & Geological Engineering (AREA)
• Fluid Mechanics (AREA)
• Geochemistry & Mineralogy (AREA)
• Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
• Earth Drilling (AREA)

Applications Claiming Priority (3)

Publications (1)

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• 2002
  • 2002-05-17 FI FI20020931A patent/FI115759B/fi not_active IP Right Cessation
• 2003
  • 2003-05-19 AU AU2003232865A patent/AU2003232865A1/en not_active Abandoned
  • 2003-05-19 JP JP2004505451A patent/JP4485352B2/ja not_active Expired - Fee Related
  • 2003-05-19 KR KR10-2004-7018509A patent/KR20050008719A/ko not_active Ceased
  • 2003-05-19 WO PCT/FI2003/000385 patent/WO2003097945A1/en not_active Ceased
  • 2003-05-19 US US10/514,633 patent/US20050199405A1/en not_active Abandoned
  • 2003-05-19 EP EP03752779A patent/EP1513986A1/de not_active Withdrawn

Non-Patent Citations (1)

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