Hydraulic and earth engineering – Foundation – Columnar structure
Patent
1988-03-18
1990-03-06
Corbin, David H.
Hydraulic and earth engineering
Foundation
Columnar structure
405237, 405256, E02D 530
Patent
active
049061410
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates essentially to a method of anchoring a prefabricated pile into the ground.
It is also directed to a pile for carrying out this method.
It is already known to make prefabricated piles comprising a base enlarged with respect to the shaft of the pile. Thus, when the pile is located in the ground, the base allows the pile to bear very heavy loads.
When it is desired to arrange piles into a light soil, it is possible to use piles with previously-made integral bases, since such piles would easily penetrate into the soil.
This will obviously not be the case with hard soils, where the base would prevent the pile from being driven in, and the pile may besides become broken under the effect of the driving operation.
It was therefore necessary to provide a pile which may easily penetrate into any types of soils and which may nevertheless comprise a base making it capable of withstanding heavy loads as well pulling forces.
SUMMARY OF THE INVENTION
The present invention is precisely aiming at accomplishing the aforementioned objects.
For that purpose, the invention provides a method of anchoring a prefabricated pile into the ground and which is of the kind inserting this pile into the ground through a driving operation or into a previously bored hole, characterized in that, after that insertion, a substantially radial deformation of the lower portion of the pile is provided to form a base imparting to the pile an increased strength against tensile or compressive stresses.
According to another characterizing feature of this method, the aforesaid deformation is carried out by inflating a bladder or the like incorporated into the lower portion of the pile, such an inflating step being performed by means of a hardenable compound such for instance as cement mortar or concrete.
It should further be pointed out that the deformation of the lower portion of the pile is carried out in a controlled manner on the inner walls of this lower portion which contains the bladder.
The invention is also directed to a pile for carrying out the method and meeting either of the aforesaid characterizing features, this pile being essentially characterized in that it comprises at its lower portion a recess containing at least one bladder or the like connected to a source of fluid under pressure through the agency of at least one pipe-line extending along the axis of the pile.
The aforesaid pipe-line comprises an end portion formed with ports which extends inside the recess and about which the bladder is arranged.
The pile according to the invention is further characterized in that the aforesaid end portion is removably connected, through screwing means for instance, to the pipe-line extending along the axis of the pile.
According to still another characterizing feature of the invention, the pile comprises longitudinal reinforcing bars which extend down into the wall of the aforesaid recess.
It should also be specified here that the bladder housed within the recess comprises a wall formed of parts foldable towards the axis of this bladder.
It is also possible to provide failure-initiating notches located on the outer periphery of the lower portion of the pile.
A plate for closing the recess may further be provided at the bottom end of the pile.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be better understood and further characterizing features and advantages thereof will appear more clearly as the following detailed description proceeds with reference to the accompanying drawings given by way of example only and wherein:
FIG. 1 is a view in vertical section of a hole formed into the ground and containing a prefabricated pile according to the principle of the invention;
FIG. 2 is a cross-sectional view taken upon the line II--II of FIG. 1;
FIG. 3 is a sectional view similar to FIG. 1 but showing the pile base made by inflating the bladder incorporated into the lower portion of the pile;
FIG. 4 is a cross-sectional view taken upon the line IV--IV of FIG. 2; and
FIG. 5 is a v
REFERENCES:
patent: 1026144 (1912-05-01), Bignell
patent: 3492823 (1970-02-01), Lamberton
patent: 4060994 (1977-12-01), Chitis
patent: 4547106 (1985-10-01), Upsker
Companie Internationale des Pieux Armes Frankinoul
Corbin David H.
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