Method and device for securing a support structure onto the ocean floor

Claim 2

In a method for securing a platform support structure, such as a framework in the form of a truncated pyramid, onto the ocean floor with the aid of piles, including the steps of providing said support structure at the region of the corners with guide bushings through which the piles are inserted, and driving into the ground said piles by a ram disposed on the top of the pile, and which during the process of pile driving supporting the piles transversely by guide elements provided on the corner columns of the framework, the improvement comprising providing near each pile at least one guide element for supporting the pile at the region where the chance of bending and/or collapse is most likely and that during the process of pile driving the step of moving the guide element along said region to continuously support said pile as it is driven downwardly at said region of likely bending.

Claim 3

In a device for securing a platform support structure, such as a framework in the form of a truncated pyramid, onto the ocean floor by driving piles into the ocean floor adjacent thereto, said support structure comprising a number of guide bushings secured to the foot near the corners of the support structure, at least one guide element for each pile, said guide element being secured to the support structure in line with the center line of the appertaining bushing, means for lowering a pile, and a pile hammer for driving the pile downwardly at said corner, the improvement wherein the guide element is placed saddle-shaped across a main column or corner rib of the support structure with legs, present on the support structure at either side of the column or rib with said guide element in contact with an associated pile at a region of the pile where bending is most likely, and means for displacement said guide element in a direction parallel to the center line of the column or rib in unison with said pile driving movement, whereby said pile is continuously supported at the region of likely bending as it is being driven downwardly by said pile hammer.

Claim 4

In a device for securing a platform support structure, such as a framework in the form of a truncated pyramid, onto the ocean floor by driving piles into the ocean floor adjacent thereto, said support structure comprising a number of guide bushings secured to the foot near the corners of the support structure, at least one guide element for each pile, said guide element being secured to the support structure in line with the center line of the appertaining bushing, means for lowering a pile, and a pile hammer for driving the pile downwardly at said corner, the improvement wherein the guide element is placed saddle-shaped across a main column or corner rib of the support structure with legs, present on the support structure at either side of the column or rib with said guide element in contact with an associated pile at a region of the pile where bending is most likely, and means for displacement said guide element in a direction parallel to the center line of the column or rib in unison with said pile driving movement, whereby said pile is continuously supported at the region of likely bending as it is being driven downwardly by said pile hammer.

Claim 5

The device in accordance with claim 2, further comprising tubes secured to the support structure parallel to the center line of the column or rib for guiding the legs of the guide element.

Claim 6

The device in accordance with claim 3, further comprising means on the outer ends of the legs of the guide element for embracing said tubes such that displacement of said guide elements is only possible parallel to said tubes.

Claim 7

The device in accordance with claim 2, wherein said guide elements are two in number and a pile hammer is secured to the upper guide element.

Claim 8

The device in accordance with claim 2, wherein each guide element is provided with several elements for accommodating a pile or pile hammer.

Claim 9

The device in accordance with claim 5, wherein said guide elements for the piles have V-shaped receiving elements oriented with the mouth of the V-shape in the same direction.