Abstract:
An assembly (1) for trenching underwater cables, comprising a cutting and lifting device (7) for cutting and lifting at least one seabed clod (11) from the seabed (4) avoiding this seabed clod (11) from separating from the remaining part of the seabed (4) but freeing up an excavation path (P) adapted to create a trench (6); an excavation device (5) for excavating the seabed (4) where the at least one seabed clod (11) has been cut and lifted to form said trench (6) producing excavated material; a depression device (19), adapted to guide a cable (13) which is to be trenched in said trench (6) for laying it in said trench (4); a suction device (18) for sucking up said excavated material; a diffusion device (20) for distributing said excavated material and filling said trench (6) once said cable (13) has been laid on the bottom; a recirculation device (39) which collects the excavated material from said suction device (18) and sends it to said diffusion device (20) so as to isolate said excavated material inside said trench (6) forming a closed circuit for the excavated material which, having been collected in the formation of the trench (6), returns to the trench (6); a device for restoring the at least one seabed clod (11) in the site thereof by closing said trench (6) at the top and preserving the area above said seabed clod (11) avoiding the dispersion of said excavated material outside said trench (6).
Abstract:
A pipe laying plow (100), for operating by moving it forward while pipe (201) is fed therethrough to be laid at a pipe laying depth (D). The plow has a boom (15) held by an above-ground structure (16), and includes a substantially linear pipe feeding tube (3) defining a longitudinal axis (33) in a vertical plane; and a plurality of substantially identically shaped, planar blades (2) attached at regular intervals (BSp) along the tube; a blade length (BL) line intersecting the longitudinal axis (33) at an attachment angle (B), and blade width (BW) lines extending laterally perpendicular to the longitudinal vertical plane; wherein, when the boom is held in operating position, the tube (3) extends longitudinally downward and rearward at a boom angle (C) relative to ground level, and the blades extend lengthwise downward and forward at a plowing angle (A) relative to ground level.
Abstract:
A system and method for increasing friction between cables and surrounding soil is disclosed. In particular, a cable apparatus for use in a sub-surface protective network of intertwined cables is provided which comprises an elongate reinforced polymer cable body having a length. The cable apparatus also includes a plurality of elongate barbs provided along the length of the cable body. The barbs extend from the cable body to a respective free end in both a lengthwise direction and radially. Additionally, the barbs are spaced apart in one or more of the lengthwise direction along the length of the cable body and circumferentially about the cable body. Moreover, according to a further aspect, a plurality of such cables can be provided underground and intertwined to define a protective network cables for protecting buried assets.
Abstract:
Die Erfindung betrifft eine Grabenfräse (10) zum parallelen Einbringen von wenigstens zwei Leitungen (11), insbesondere Kabeln oder Rohren, in den Untergrund, umfassend wenigstens zwei Verlegeeinheiten (12), wobei jede Verlegeeinheit (12) je eine Fräseinrichtung (13) zur Bildung einer Erdrinne (14) im Untergrund und eine Leitungsführung (15) zum Einlegen einer Leitung (11) in die durch die Fräseinrichtung (13) gebildete oder bildbare Erdrinne (14) umfasst, und ein Zugfahrzeug (16) zum Ziehen der Verlegeeinheiten (12) durch den Untergrund entlang einer vorgesehen Fahrtrichtung (F).
Abstract:
A method for offshore installing of power cables or tubes (17) for power cables for wind turbine installations (2, 3), wherein an end of an incoming power cable and an end of an outgoing power cable or an end (33) of an incoming tube (31) and an end (34) of an outgoing tube (32) are pulled (S4) into an offshore wind turbine installation (2) simultaneously. By pulling both ends of the incoming and outgoing power cables/tubes into the offshore wind turbine installation simultaneously, the ends of the incoming and outgoing power cables/tubes can be pulled into the offshore wind turbine installation in a single process step.
Abstract:
The present invention provides an improved pipeline burying apparatus that uses specially configured jetting nozzles that intake sea water surrounding the nozzle. The apparatus provides a frame supporting spaced apart left and right inclined pipe sections that are configured to be placed on opposing sides of the pipeline to be buried. Each inclined pipe section is fitted with a plurality of jetting nozzles that are positioned on one of the inclined pipe sections, in vertically spaced apart positions and in horizontally spaced apart positions. At least some of said jetting nozzles include a nozzle body having an outer surface and a main, central longitudinal fluid flow channel with a central channel axis. A fluid inlet end portion of the nozzle body has an externally threaded portion that enables connection to an internally threaded portion of a selected one of the inclined pipe sections. A discharge end portion of the nozzle body extends outwardly from an inclined pipe and the threaded portion. A plurality of lateral channels each intersect the main channel at an acute angle. In one embodiment, the main central longitudinal channel has an inlet section with an inlet section diameter, a discharge section having an outlet section diameter and a connecting section that is in between the inlet section and the outlet section.
Abstract:
An apparatus (2) for forming a trench in a sea floor and/or displacing material on the sea floor is disclosed. The apparatus comprises a body (4 ) and front skids (12) mounted to the body for engaging the sea floor and supporting the body. The front skids are adjustable between a first mode, in which the front skids engage the sea floor, and a second mode, in which the front skids engage the sea floor adjacent the trench and at the trench walls.
Abstract:
The present invention relates to a system and a corresponding method for installing ducts/cables in micro trenches. Said system (100) being arranged for sawing micro trenches (1) and placing ducts/cables (29) in micro trenches (1) in a continuous process; said system (100) comprising a sawing machine (8) including a saw blade (14) and a stabilizing device (13), said stabilizing device (13) being arranged directly behind said saw blade (14) and being arranged to stabilise the sides of said micro trench (1), said stabilizing device (13) comprising guiding means (17) arranged for guiding said ducts/cables (29) into said micro trench (1); said system (100) further comprising: -at least one drum (28) for holding ducts/cables (29); -a duct guiding device (30) arranged to guide said ducts/cables (29) from said at least one drum (28) to said stabilizing device (13); -a marking device (23) arranged to mark each of said ducts/cables (29) so that each of said duct/cable is given a unique identity; and wherein the stabilizing device (13) further is arranged to: -install said marked ducts/cables (29) in said micro trench (1) by means of said guiding means (17) based on said unique identity.
Abstract:
A seabed trenching plow (40) has a chassis (10), a sled (30) and a towing assembly (70). The towing assembly (70) has a pair of wings (71) extending laterally from each side of the chassis (10). The wings (71) are aligned on an axis (75) transverse to the chassis (10) and adapted for connection to a towing line "L". The transverse axis (75) is forward of the center of gravity (81) of the plow (40) and rearward of the sled (30), affording an over the stern releasable and retrievable trenching plow of sufficient weight and strength to excavate a three meter trench in a single pass. To assess the protective capabilities of the trench, a threshold signal indicative of a desired composition of seabed-trench soil is compared with a real-time data signal indicative of the actual to produce an alarm signal when the real-time data signal is not protective-capability compliant with the threshold signal.
Abstract:
A remotely operated submersible vehicle for preparing a trench in a subsea bottom is disclosed. The vehicle comprises a frame, hoisting and control cables for suspending the vehicle from a surface vessel, thrusters for manoeuvring the vehicle, and an elongated mechanical excavating tool extending across the width of the trench and connected to conveying means for carrying excavated seabed material to a position outside the trench. A method of preparing a trench using the vehicle is also described.