Hydraulic and earth engineering – Foundation – Columnar structure
Patent
1996-07-08
1998-11-10
Graysay, Tamara L.
Hydraulic and earth engineering
Foundation
Columnar structure
405242, E02D 534
Patent
active
058333991
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to apparatus for use in forming piles.
BACKGROUND OF THE INVENTION
Conventional methods for driving piles, or pile formers, into the ground, comprise either hammering the pile or pile former, or vibrating the pile or pile former, into the ground.
The disadvantages of such techniques are that damage can be caused to nearby buildings by the hammering, or the vibration, particularly if the buildings are old and unstable, and the techniques are noisy.
A prior proposal disclosed in NL (A) 7 712 013 is a concrete pile formed with a projecting helical threaded protrusion which is inserted into the ground by means of applying a torque thereto in the manner of a screw.
Such piles are relatively complicated and consequently expensive to manufacture and the torque required to drive them is high due to the large surface area in contact with the ground during the insertion procedures.
SUMMARY OF THE INVENTION
It is an object of this invention to obviate and/or mitigate the disadvantages.
According to one aspect of this invention there is provided apparatus for use in forming a pile, said apparatus comprising an elongate member, a helical flight on the elongate member, and a transmission device to transmit torque to the elongate member and flight, whereby the apparatus can be inserted into the ground by torque applied through said transmission device to form at least part of the pile, the transmission device being of greater diameter than the elongate member whereby as the elongate member is inserted into the ground, the transmission device is pulled downwardly through the ground by the elongate member, thus creating a hole in the ground which is of substantially the same width as the transmission device.
Preferably, the elongate member has a first flight arranged towards its free end and a second flight spaced from the first flight. Advantageously, the second flight is so arranged on said elongate member that it follows substantially the path of the first flight when said elongate member is inserted into the ground. Further intermediate flights may be provided between the first and second flight.
Preferably a removable connecting member connects the transmission device to the torque applying means.
One or more elongate extension members are fixable between the connecting member and the torque applying, device.
Preferably, the transmission device is open topped, includes an outer cylinder surrounding an end of the elongate member and having an end converging towards said elongate member and a diametrically extending drive bar.
Preferably the elongate member is a steel tube, the free end of which is closed or flattened into a spade formation. Preferably the transmission, device is welded to the elongate member at the smaller end of the converging portion.
Preferably the connecting member has an outer diameter substantially equal to that of the transmission device and a projecting spigot for insertion into the transmission device, said spigot having a longitudinally extending surface thereon to engage the drive bar to transmit torque to the elongate member and helical flight(s).
Preferably two diametrically opposed longitudinally extending surfaces are provided each having an inclined surface leading thereto such that when the direction of torque application is reversed the connecting member disconnects from the transmission means.
Preferably a further helical flight is formed on the outer surface of the connecting member. Said further helical flight preferably extends for a full revolution, is of a diameter less than the first, second and intermediate flights, but of the same pitch. Alternatively the flights may be of substantially the same diameter.
Preferably the said extension members are hollow.
Each extension member is also provided with appropriate connecting formations to connect one end of the extension member to a further extension member.
Preferably, the connecting formations are in the form of threads.
Preferably the-or-each extension member has at least one
REFERENCES:
patent: 2008521 (1935-07-01), Takechi
patent: 3345826 (1967-10-01), Hignite
patent: 3512316 (1970-05-01), Turzillo
patent: 3690109 (1972-09-01), Turzillo
patent: 3962879 (1976-06-01), Turzillo
patent: 4738568 (1988-04-01), Steding
patent: 4790689 (1988-12-01), Henn et al.
Global Innovations, LLC
Graysay Tamara L.
Lagman Frederick L.
LandOfFree
Apparatus for use in forming piles does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus for use in forming piles, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for use in forming piles will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1510474