Hydraulic and earth engineering – Foundation – Columnar structure
Reexamination Certificate
1999-07-02
2001-05-22
Bagnell, David (Department: 3673)
Hydraulic and earth engineering
Foundation
Columnar structure
C405S231000, C405S244000, C405S253000, C175S162000, C175S135000, C173S001000, C173S046000, C173S147000
Reexamination Certificate
active
06234719
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method for piling in connection with vertical or substantially vertical bore holes for base pipes drilled out into the earth, said base pipes, possibly, can be casted firmly to the surrounding hole wall. Likewise, the invention relates to devices in or relating to Aa combined drilling and piling machine or rig for the above-mentioned general objects.
2. Related Art
In order to attach a mounting plate for anchorage of a mast, it has previously been known to drill a hole and, thereafter, to lower a base pipe for the mounting plate, and it has also been known to attach such a mounting plate to a pile.
In order to make the base of the mounting plate sufficiently stable, the upper portion thereof should be constituted of a base pipe, because known piles/pile pipes do not exhibit the sufficient cross-sectional diameter.
According to prior art techniques, the piles are driven down by means of a special piling machine. It represents an obvious disadvantage having to use two separate working machines, a drilling machine and a piling machine, for carrying out two mutually associated working operations.
SUMMARY OF THE INVENTION
As known piles are cheaper than base pipes, simultaneously as piles are less expensive to install, one of the objects of the present invention is to mount piles in the continuation of a base pipe in order to prevent the base pipe from sinking.
Therefore, an essential object of the present invention has been to simplify the piling operation to a substantial degree.
By means of a drilling rig in which the bit, as known per se, is assigned a drilling hammer in order to make the drilling more efficient, a vertical or substantially vertical hole is predrilled. Prior to the positioning/casting of the base pipe, the piling is now effected, the pile with the lower end thereof being brought into contact with the lower end face of the predrilled hole, so that the piling is carried out from this lower positioned level only, as opposed to starting piling from ground level as with conventional piling.
Instead of using a separate piling machine, the piles are driven down using the same drilling rig as the one used during the drilling. During the piling, only the drilling hammer (without rotation) plus hydraulic feed pressure are used in order to ram the pile down.
The drill string with its bit is adapted to be swung about a vertical axis situated at a lateral distance from the drill string axis, so that the drill string may be swung aside of the predrilled hole, so that the pile can be lowered into the hole. During the drilling operations, a casing follows the bit/drilling hammer and becomes standing on the bottom of the predrilled hole. This casing will act as a guidance upon lowering the pile, which may be tubular in shape. The usually tubular pile may be centered in relation to the casing by means of a guiding means placed in the lower end of the casing.
During piling, when there exists a need for the reciprocating stroke-/impact-like movements only, but not for the bit, the lower end portion of the bit is externally covered by a chisel collar, whereafter the “drill string” (its drilling function being temporarily put out of operation) is swung back into alignment with the predrilled hole and the casing.
When the lower end of the pile pipe has reached firm ground, the casing is pulled up, and the base pipe is lowered and, possibly, is plastered firmly to surrounding hole wall.
An advantageous device for such a combined drilling and piling rig consists in installing an insignificantly narrower pipe than the casing between the latter and the drill string. During the pneumatically based drilling operation, pressurized air is pressed down, causing cuttings to be pressed up between the casing and said narrower, internal pipe surrounding the drill string. The insignificant difference of diameter between the casing and the narrower pipe makes the annulus therebetween small, thus requiring less capacity from the air compressor.
Base pipes in accordance with the invention are especially well suited as bases for masts, e.g. masts carrying lines for electrical traction current on railroads.
A combined drilling and piling rig according to the invention simplifies and makes more efficient building of bases positioned below ground level also in other respects in relation to prior art base positioning methods, the latter in the main consisting in digging-up, erecting a formwork and casting a base, possibly subsequent to ramming down pile(s) from ground level.
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Bagnell David
Lee Jong-Suk
Mathews, Collins Shepherd & Gould P.A.
Njal Underhaug
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