Mega piles

Technology of mega piles

Mega piles are used to strengthen and rehabilitate the foundations of existing buildings, as well as when there is no possibility of access to the pile drilling machine, which was the case in Szeged, Hungary.

Since the broken piles had to be done on in the place where the new facility will be located, as well as in the places where the feet for the access poles to the new facility will be located, a steel barbecue construction with ballasts lined up on it was used as a substitute for counter-cargo.

The steel grill structure consisted of 2 IPE500 profiles 4.0 m long, on which 6 IPE300 profiles were placed, at an equidistant distance. All profiles were connected via welds.

After determining the position of the piles, concrete feet measuring 1.0x1.0x0.25m are placed one on top of the other and next to each other, 1.0 m high and 4.0 m long, from one and with on the other hand, on which the steel grill structure is placed.
After mounting the steel structure, ballasts are placed on it to the required weight for counter-load.
In this case, the required force in the pile was 40 tons, where 70 to 90 tons of cargo were used for counter-load, depending on the position of the pile in relation to the steel structure.

The steel elements that were pressed into the ground were 273 mm in diameter and sheet metal thickness 5 , 0mm. The embossing was done in segments, where the segments were 1.0 m and 0.85 m high, due to the free space under the steel structure, so that uninterrupted work and maneuvering could take place.
A 100-ton press was used to emboss the piles. and a two-foot (IPE600) bearing (goat), which is positioned above the embossed pile and which served as a support against which the press resisted, in order to achieve the required force in the pile.
> The first segment is processed and made in the shape of a spike for easier penetration into the ground. After each embossed segment, a second segment is placed from above and their joint is welded to achieve the continuity of the pile, as well as to prevent water penetration inside the pipe, which is later contracted and connected to the overhead beam or foundation foot.

Depending on the stroke of the piston, a partial indentation of pipe segments is performed, where after one indentation a stump (steel pipe filled with wood) of a certain height is placed, and the action is repeated until the steel segment is pressed on ~ 15 cm from the ground, which is enough height for the welder to be able to easily connect the next element.

In order to achieve the required force, ~ 13 segments were pressed, so the depth of the piles was ~ 11.0 m. The obtained force in the pile is checked via a manometer located on the press pump, and depending on the required force and the diameter of the press piston, the required pressure in bars is determined in order to achieve the required force. In this particular case, the diameter of the press piston was 180 mm, so the required pressure was 160 bar = 40 tons. The number of required elements that is injected depends on the geomechanical characteristics of the soil and the required force in the pile, so the connection and indentation of the segments is performed until the required force in the pile is obtained.

Geomechanical team

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