DE2017737C3 - Method for producing an in-situ concrete pile with foot enlargement and device for carrying out the method - Google Patents

Description

2. Apparatus for carrying out the method. Technical progress consists in the invention according to claim 1, consisting of one with extension and one extension therein that that of the area of the dilation of the foot There is a chamber provided with a return line, corresponding load-bearing capacity even with a short shaft length characterized in that the chamber can be used by. Compared to the known an expandable cushion (3), the pile has the advantage of in-situ concrete piles, under one at the end of the return line that a tight connection to the ground is reached and ordered plate (2) is located, and with the 10 a shaft crimping is superfluous. The through Supply and return lines (1) are connected. the enlargement of the pile foot caused great earth resistance

3. Apparatus according to claim 2, characterized in that the cone is used together with the indicates that in the interior of the. Cushion (3) on the weight of the pile, the resulting from the underpressure lower end of the feed pipe arms (7) rigidly absorb forces acting upwards. The short or articulated. »5 shaft length in turn saves excavation

and concrete. With the pressing in of the pile base c

but not only an impermissible settlement is prevented, but also a test load of the

The invention relates to a method for manufacturing soil anticipated.

len an in-situ concrete pile with foot extension, at 30 The pile is in order to carry out the procedure a borehole made with foot enlargement an expandable cushion provided, and later filled with pile concrete, and not just a construction device brought in under pressure to carry out the procedure. fabric prevents in permeable soil layers or

One method with these characteristics is, for example, to migrate columns, but rather a bias of the according to the USA patent 3 365 894 in the adjacent soil. An am knows, in which the foot extension in tinem through one end of the return line arranged plate for Refrigerant made stable Both cut out- setting a reinforcement and forming one and the surrounding soil is later thawed. Domes, which completely backfills the Auspreß-Bei Such piles ensure the load-bearing capacity of the room.

Stake shaft mostly not fully stressed. Unsatisfied- 40 The narrowness of the stake shaft means that the Above all, it is digend that the load-bearing capacity of the pile-pile base extension filling pillows in part les with an enlarged foot does not have to be introduced in relation to the sole folded state. It has Magnification can be used because it has proven to be useful for disassembling Area enlargement with constant bottom folds at the lower end of the feed pipe arms denpressung are connected non-rigidly or articulated in accordance with the load plate law, with their permissible large settlements are connected. Help the pillow is spread out.

In place piles, which result from a prefabricated part and on-site exemplary embodiments of the invention

concrete (German Auslegeschrift 1 215 603), from the drawing in conjunction with the description It is known to increase the load-bearing capacity of the exercise. It shows

Set the finished pile in the borehole and then un- 50 F i g. 1 an enlargement of the pile base during insertion to carry out extrusions from the bottom of the pile. the support fluid,

For this purpose, the prefabricated pile is marked with a fig. 2 a pile base filled with concrete

chamber connected by supply and return lines,

mer provided in det the underpressing carried out F i g. 3 shows a plan of FIG. 2,

men and is checked. This method is only for 55 F i g. 4 a device with articulated very long piles appropriate because the under the senen pipe arms,
The bottom of the pile only generated pressure up to a size- F i g. 5 shows a plan 7U F i g. 4th
can be added, which the perpendicular force In F i g. 1 is at the bottom of the access

th from the weight of the pile and the occurring and return lines 1 a solid, curved corresponds to the skin friction. In the case of short piles 60, plate 2 and under this an expandable cushion 3. the permissible soil pressure cannot be used are, because the sole pressure, the pile possi-cushion 3 unfolds and over the entire pile sole would probably move up. spread out. The one ending above the inlet pipe

The object of the invention is to provide a method for the return line after the cushion 3 has been filled. After hardening of the pile concrete 4 called type to create, in which under one foot the support fluid is replaced by a hardening extension on the entire sole, even with short building material under pressure.
Cast-in-place concrete the permissible soil pressure is extensive. 2 shows an already filled with pile concrete4

th pile base. The end of the supply line is fixed here Poor5 provided. As can be seen from Figure 3, these are extended by plastic tubes 6, which stretch when pressed out.

F i g. 4 and 5 show an embodiment of the device, in the 3 tubular arms 7 are arranged in the expandable cushion, which at the lower end of the Supply line stair or articulated are connected. The star-shaped expansion of the tubular arms 7, accordingly Fi g. 5, guarantees that the entire pile base area is also included in the case of unfavorable subsoil Security is suppressed.

1 sheet of drawings

Claims (1)

going used and additionally the settlement '. Patent claims: to be reduced. Furthermore, a device is to be created with which the method is particularly favorable 1. A method for producing an in-situ concrete can be carried out, the chamber extending over the pile with foot enlargement, in which a borehole 5 should extend the entire floor area and additionally to the side Foot extension made and later with borrowed press-outs of the pile shaft not required-pile concrete is filled, are thereby marked borrowed. draws that the sole with a flexible The invention solves the problem in that the Ren device is provided, which is provided with a sole with an expandable device Support fluid is filled, and that after Einio, which is filled with a support fluid, and bring and harden the pile concrete the support that after introduction and hardening of the pile concrete liquid under pressure through a hardening the supporting liquid under pressure through a hardening Building material is replaced. tendency building material is replaced.