WO1982001732A1

WO1982001732A1 - Prefabricated split and rammed pile made with steel tube,of square,rectangular or round shape

Info

Publication number: WO1982001732A1
Application number: PCT/CH1981/000126
Authority: WO
Inventors: Anton Styger
Original assignee: Anton Styger
Priority date: 1980-11-13
Filing date: 1981-11-12
Publication date: 1982-05-27
Also published as: EP0064517A1; CH653724A5

Abstract

This rammed pile is intended for falling away and spongy grounds, with no resistance, where normal foundation piles made of concrete and wood as well as adherence steel piles sink. The tubular pile with different dimensions has cut out flaps (a, e) in series, as well as a steel point (d) at the front portion. The driving in is carried out conventionnally by means of a diesel ram, but is quicker due to the small cross-section of the tube with respect to that used with adherence piles. After having reached the desired depth, a controlled explosion distributed on the entire length of the pile is set off. To this effect, the prepared flaps (h) are pushed outwardly and big holes (h) are dug in the ground. The tubular pile is then filled with fluid concrete (g). After the hardening a surprisingly high bearing force is obtained due to the large indented surface in contact with the subsoil.

Description

Prefabricated ramming and explosion piles made of tubular steel in square, rectangular and round shape

The present invention relates to a novel method in the deep foundation area. The area of application is primarily in the area where normal wood, concrete and sheet pile piles are no longer used economically. cannot be loaded enough.

The most important goal of the invention was to construct an optimal, fast, ready-to-use support post in the so uneconomical substrates, which despite its lightness could achieve a not yet achieved gearing (Fig. 2h + 3h) with the underlying substrate.

Conventional in-situ concrete pile processes require a complex and time-consuming excavation process as well as a relatively large machine park that not every pile driver can muster, which can automatically be deduced from the high costs per prefabricated pile.

Another disadvantage of the in-situ concrete piles is the relatively high dead weight, especially where the soil is so bad that it threatens to sink without actually loading.

The desired goal with the explosion rammed pile is achieved by ramming the already prefabricated steel pipe with the (Fig. 4 a + e) incised folding flaps like a conventional pile (Fig. 1). Depending on your preference or the requirements placed on him, he can extend or be welded together.

After the completed ramming procedure to the desired depth, a metered, distributed explosive charge coordinated with the subsurface is triggered (Fig. 2). The prepared flaps are opened by this strong explosion pressure (Fig. 2a + h) and even larger holes and depressions are made in the extremely soft underground. Immediately the pile with flowing concrete (Fig. 3g) with event. Poured out additives.

The process, also suitable for underwater foundations, is carried out without an explosive charge. After driving in, the concrete is poured in layers and driven with a plug or. displaced, so that optimal interlocking (Fig. 2h + 3h) is also achieved with this system.

For the civil engineer with this invention, a wide range is available, but for any difficult reason, the desired pipe thicknesses, respectively. Pipe sizes can be equipped with the explosion flaps.

With this invention it is also possible to equip an in-situ concrete pile with the excellent properties of prestressed concrete (Fig. 4c).

The prestressing cables (Fig. 4c) can be inserted beforehand in the corners of the steel pipes. They are fixed to the inner corners with a plastic spacer to ensure a compact concrete coating in the event of an event. later corrosion of the steel outer wall.

By this invention, the goals set are achieved. In particular, a major step is being taken again, which entails rational prefabrication in the deep foundation area and thus actively helps to reduce construction times.

Claims

PATENT CLAIMS

1. Prefabricated tubular steel pile (4) in square, rectangular and round shape for ramming in conventional form and type (1). The steel pipe is characterized by flap-shaped (4a) cutouts on the four flat sides, which remain closed when inserted, opened in the rammed condition by a metered (2) explosion and subsequently concreted (3g).

2. In the second possible process, a driven-in steel pile becomes a strongly toothed in-situ concrete pile by pouring the concrete in layers and pressing or hitting with a plug.

3. The steel tube pile according to claim 1 available in square and (4) rectangular and round shape is designed for all commercial dimensions, since this new method is possible on all flat-walled tubes. The cross-sectional dimensioning (4) is determined by the required load-bearing capacity and the statics.

4. The tubular steel pole is characterized by the additional tension reinforcement (c) in the four corners and the smooth, pyramid-shaped welded-on point (d).

5. The tubular steel pole characterized by in the claim

1 mentioned flap-shaped cutouts (a). This claim encompasses all possible variants of flaps, such as all angular, semi-circular and round shapes (e) that allow optimal spreading (2h) from the mother post in the different floor materials.

6. The steel tube pile is characterized by flat ends that allow coupling or welding (f) with the next tube element.