CH683197A5 - Basket for concrete pile mfr. - has permeable stocking around rigid basket members to prevent dispersion of sand and cement into surrounding ground and water - Google Patents

Abstract

A longitudinal support basket, to make a concrete pile, has a flexible stocking (6) round the rigid components (1-5) for the longitudinal and lower contour of the basket. The stocking (6) is a woven material of polyethylene and polypropylene, in a water permeable material. USE/ADVANTAGE - The basket is for the prodn. of concrete piles. The stocking prevents sand or cement, or other components, dispersing into the surrounding ground and any water.

Description

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The invention relates to an elongated support basket for the production of a concrete pile. The invention further relates to a method for producing this support basket.

If you want to produce a concrete pile with in-situ concrete in a deepening of the ground at a construction site, you can do this in different ways. A hole can be sunk (with a rotary drill or gripper); however, a hollow pile can also be placed as a displacement pile (displacing the soil). In both cases, the recess made in the ground is then filled with in-situ concrete. If the concrete pile to be manufactured is a load-bearing element, it is reinforced and an elongated reinforcement basket is inserted into the recess made in the ground.

A pouring pipe is then introduced into the recess made in the ground and thin, flowing concrete is poured into the recess via this pouring pipe, and concreting is carried out from the bottom of the recess. Here, the pouring pipe and the drill pipe (when making the recess using a rotary drill or gripper) or the hollow pile (when producing the recess by displacing) are successively pulled upwards. When manufacturing the concrete pile in this way, it cannot be avoided that cement and filler material (sand) are washed out into the surrounding water (flowing or standing). This should be avoided for reasons of environmental pollution and, in addition, this prevention of flooding would also make the cement more economical to use. The object underlying the invention is therefore to avoid the above-mentioned flushing out of the cement and the filler material. For this purpose, the reinforcement cage mentioned at the outset is specially designed, but the reinforcement cage can also be designed in such a way that it does not have to perform a reinforcement function in the concrete pile to be produced and is therefore referred to by the superordinate term “support cage”.

The inventive design of the elongated support cage, which can therefore also serve as a reinforcement cage, results from the characterizing part of patent claim 1.

It is therefore assumed that the so-called support cage is made up of rigid components, since otherwise it cannot have any function as a support or even as a reinforcement.

In the drawing, an embodiment of the subject of the invention is shown, wherein the support cage according to the invention is designed as a reinforcement cage, and wherein the concrete pile to be produced is to be formed by means of a drill pipe (with a rotary drill or gripper) and not by displacement by means of a hollow pile. Show it:

Fig. 1 shows a vertical section through the lower part of a hole made in the ground, with an inserted, designed as a reinforcing cage support basket, and

FIG. 2 shows a cross section along the line II-II in FIG. 1.

The elongated support cage according to the invention has rigid components 1-5, which are surrounded radially and axially below by a flexible stocking 6. The rigid components 1-4 represent reinforcing irons, and the rigid components 5 serve as spacers for the stocking 6 and are designed as plastic tubes running parallel to one another. By means of these plastic tubes 5 serving as spacers, the leg part 7 of the stocking 6 is held at a radial distance from the reinforcing bars 2 and 3, so that these reinforcing bars 2, 3 and, of course, also the reinforcing bars 1 are embedded in the concrete when concreting later. In addition to its leg part 7, the stocking 6 also has a foot end face 8. The plastic tubes 5 serving as spacers for the stocking 6 can be connected to the reinforcing bars 3, wherein the reinforcing bars 1-4 made of structural steel can be welded to one another. 1 and 2 that the stocking 6 with its leg part 7 is located radially outside the plastic tubes 5.

The stocking 6 consists of a plastic fabric or is essentially made up of a plastic fabric, and could therefore also contain portions of other materials. In practice, a plastic fabric made of polyethylene and polypropylene has proven itself. It is advantageous if a "throttling stocking" is used so that this stocking should be permeable to water, so that water can pass through in a throttled manner. In practice, a plastic fabric was used for the stocking, which has a water permeability in the range of 30-50 liters / m2 • s. The stocking 6 can be in the form of a seamless cylindrical tube to which a rondelle forming the foot end face 8 can be sewn on. The stocking thus formed can then be pulled upwards from the lower end of the rigid components 1-5, as can be seen from FIG. 1. In another embodiment, the leg part 7 of the stocking 6 could also be formed from a web-shaped material which is connected to one another at two opposite ends to form a tube, whereupon the roundel forming the foot end face 8 is then attached to this tube.

The circumference of the leg part 7 from the stocking 6 is somewhat larger than the circumference of the rigid support basket parts 1-5, this meaning being explained later.

The manufacture of a concrete pile will be explained below, the drilling of the borehole being carried out by means of a gripper (not shown) within a drill pipe 9. During the drilling of the borehole, the borehole 10 to be produced is continuously flooded. The sinking by means of a gripper creates a radial oversize 11, which is therefore radially outside of the drill pipe 9, which is lowered approximately parallel to the gripper. The reinforcement cage has been completed outside the borehole 10

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that which consists of the rigid components 1-5 and the flexible stocking 6 pulled over them. This reinforcing cage is now lowered into the flooded borehole 10, the water permeability of the stocking 6 mentioned being expedient. In practice, this lowering of the reinforcement cage can e.g. extend over a period of 10 minutes, during which time the water in the borehole 10 is exchanged from the outside through the stocking to the inside. If the stocking were impermeable to water, the water would have to be pumped out of the borehole during the insertion of the reinforcement cage and pumped back into the interior of the stump. During this insertion of the reinforcement cage into the borehole 10, the drill pipe 9 is still in the borehole. If the reinforcement cage has been inserted completely into the borehole 10 within the drill pipe 9, a pouring pipe, not shown, is inserted through the reinforcement cage and also fills with water. The water is then expelled from the pouring tube by means of a piston guided in the pouring tube, this fluid being followed by the low-viscosity flow concrete and concreted upwards from the bottom of the borehole 10, the aforementioned pouring tube and the drilling tube 9 being successively pulled upwards. When the drill pipe 9 is pulled upwards, the flexible stocking 6 nestles against the soil 12, as can be seen in FIG. 1 below the drill pipe 9. For this reason, the leg part 7 of the stocking has a larger circumference than the drill pipe 9. When concreting, neither cement nor filler material (sand) can now be washed out, since the cement and filler material are retained by the water-permeable stocking. Gradually, the tissue of the stocking becomes completely blocked by the retained cement and the retained filling material and therefore also becomes impermeable to water. When the concrete pile has thus been produced, the stocking has also become almost impermeable to water, so that the finished concrete pile remains virtually unaffected by the flowing or standing water later on. If the stocking is impermeable to water right from the start, the finished concrete pile remains unaffected by the flowing or standing water.

Since the stocking is held at a radial distance outside of the reinforcing bars 2 and 3 by the spacers 5, these have been surrounded by the concrete during the manufacture of the concrete pile and are embedded within the concrete pile.

If a concrete pile is to be produced without reinforcement, the reinforcing irons 1-4 are not required, so that only a support basket is required to support the throttle stocking 6. Such a support cage must therefore be self-supporting and in turn has rigid components, e.g. the plastic tubes 5, which are held by means not shown on the circular path shown in FIG. 2 to form a support for the flexible stocking 6 put on.

Claims (14)

Claims 1. Elongated support cage for the production of a concrete pile, characterized in that the outer contour in the longitudinal direction and at the bottom of that body which is formed by the rigid components (1-5) of the support cage is encompassed by a flexible stocking (6). 2. Elongated support cage according to claim 1, with reinforcing irons (1-4), characterized in that the reinforcing irons (2, 3) determining the outer contour of the support cage are surrounded radially from the flexible stocking (6) by means of spacers (5), for embedding these reinforcing bars (2, 3) in the concrete. 3. Elongated support basket according to claim 1 or 2, characterized in that the stocking (6) is constructed from a plastic fabric. 4. Elongated support basket according to claim 3, characterized in that the plastic fabric consists of polyethylene and polypropylene. 5. Elongated support basket according to one of claims 1-4, characterized in that the stocking (6) is permeable to water. 6. Elongated support basket according to claim 5, characterized in that the water permeability is in the range of 30-50 liters / m2 • s. 7. Elongated support basket according to claim 1, characterized in that it has plastic tubes (5) which run parallel to one another and are intended to extend along the borehole (10), and in that the stocking (6) extends radially outside of these plastic tubes (5 ) is located. 8. Elongated support basket according to claim 2, characterized in that the spacers (5) are formed as mutually parallel plastic pipes which are intended to extend along the borehole (10). 9. Elongated support basket according to claim 2 or 8, characterized in that the spacers (5) on the reinforcing iron (3) are connected. 10. Elongated support basket according to one of claims 1-9, characterized in that the stocking (6) has a foot end face (8). 11. A method for producing the support cage according to claim 1 or 2, characterized in that the flexible stocking (6) in the form of a tube is pulled upwards from the lower end of the rigid components (1-5). 12. Flexible stocking for an elongated support basket according to claim 1, characterized in that it consists of a water-permeable material and comprises a leg part (7) and a foot part (8). 13. Stocking according to claim 12, characterized in that it is present as a seamless cylindrical tube (7) to which a rondelle forming the foot face surface (8) is sewn on. 14. Stocking according to claim 12, characterized in that it has been formed from web material which is connected to one another at two opposite ends to form a tube. 5 10th 15 20th 25th 30th 35 40 45 50 55 60 65 3rd