Hydraulic and earth engineering – Foundation – Columnar structure
Patent
1984-01-13
1987-01-27
Corbin, David H.
Hydraulic and earth engineering
Foundation
Columnar structure
405 50, 405233, 405243, 405267, E02D 310, E02D 538
Patent
active
046391681
DESCRIPTION:
BRIEF SUMMARY
FIELD AND BACKGROUND OF THE INVENTION
The invention relates to a hollow foundation body of substantially constant cross-section, consisting of concrete, which is downwardly extended by a water-pervious layer. A filter pipe is arranged in the water-pervious layer from which entering water can be removed through a pipe extending through the foundation body.
It has repeatedly been suggested to arrange drainage piles, which are generally used for lowering ground water in the region of foundation piles or walls, in a direction other than laterally with respect to the foundation structure. On the contrary, a pipe is passed through the foundation body into the underground, into which the ground water enters from a water-pervious layer located below the foundation body, whereupon it is pumped or sucked upwardly. Statically the filter layer located below the foundation body does not form part of the foundation body in known facilities of this kind see Austrain Patents Nos. 186,197 and 225,629.
SUMMARY OF THE INVENTION
It is the object of the present invention, compared with the afore-mentioned, to design a foundation body of the above-outlined kind, in particular a foundation pile, such that it first acts as a drainage pile in a manner known per se, but is at the same time statically effective over its full length. This result is obtained by forming the water-pervious layer of filtering concrete, in particular uniform grained concrete which is known per se.
Filtering concrete, and in particular uniform or like-grained materials, have been produced and were used for pre-fabricating filtering stones which were then arranged as required. When the like-grained material was introduced into the ground water region, as described in Austrian Patent No. 358,997, provisions had to be made to seal, on the one hand, the wall of the drilling hole and, moreover, to make the like-grained concrete impervious to ground water by admixing sufficient amounts of binding agent.
The resistance to pressure of the filtering concrete used according to the invention is greater than that of natural water-pervious layers or of a gravel jacket arranged around the filter pipe.
It is further possible to provide the whole foundation body with a continuous reinforcement. As soon as the ground water level has been sufficiently lowered the filtering concrete can, further, be injected under pressure with a hardenable injection material. This has already been suggested see Austrian Patent No. 168,946 to make a filter layer impervious to water. In conjunction with the invention this further results in the fact that the lower end of the foundation body is better able to absorb pressures transmitted from the upper part thereof.
BRIEF DESCRIPTION OF THE DRAWINGS
Details of the invention will be described below with reference to the drawing, in which:
FIG. 1 shows a cross-section through a drainage pile;
FIGS. 2a to 2g illustrate the steps of making the pile of FIG. 1;
FIGS. 3a to 3d show the use of the described piles during the construction of a building and;
FIGS. 4a to 4c show the invention being applied with a drainage wall.
DESCRIPTION OF PREFERRED EMBODIMENTS
The drainage pile illustrated in FIG. 1 comprises a lower part of filtering concrete 1 and an upper part of water-impervious normal concrete 7. It is continuously provided with longitudinally extending reinforcing irons 2 which are held together by helical reinforcing irons extending in circumferential direction. Pipes 6 and 4 extend along the axis of the pile surrounded by the soil 8. The pipe surrounded by the filtering concrete 1 is designed as water-pervious filter pipe 4 and, accordingly, provided with slots or the like. A bottom plate 3 with a swamp pipe 5 welded thereto prevents washing-out of the soil below the drainage pile. 9 indicates a removable rubber packer which prevents the concrete from entering inside the filter pipe 4 while the layer of filtering concrete 1 is made. The pile is vertically elongated and has a constant transverse cross-section.
The illustrated drainage
REFERENCES:
patent: 2622683 (1952-12-01), Silitch et al.
patent: 3277962 (1966-10-01), Flickinger et al.
patent: 3442089 (1969-05-01), Sollay
patent: 3512365 (1970-05-01), Muller
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