摘要:
A line and level determination system for a trenchless construction apparatus has a block assembly which is attached by welding to a lead casing to be installed with the trenchless construction apparatus. The block assembly has a water inlet, a water outlet, a tilt sensor and a light emitting device disposed within the water outlet. A water hose has a first end attached to the water inlet and a second end attached to a water source. The line and level determination system has a controller connected to the tilt sensor and the light emitting device. The controller selectively energizes the tilt sensor and the light emitting device. Data from the tilt sensor is displayed on a screen of the controller. A surveying instrument, such as a theodolite, may be utilized to determine line from the illumination of the light emitting device into the casing.
摘要:
The invention provides a trenching apparatus and a method of using a trenching apparatus. The trenching apparatus (100) may include a main body portion (10), trench cutting equipment (50) depending from the main body portion, at least two ground contacting units (16) arranged on opposed sides of the main body portion and on which the main body portion is supported, each of the ground contacting units being connected to the main body portion by a respective independently operable suspension assembly (20), the respective suspension assemblies being configured to compensate for unevenness of the ground thereby to maintain the trench cutting equipment in a desired angular orientation with respect to the vertical.
摘要:
A jetting system for an undersea trencher has jetting conduits extending onward of its trench-cutting jetting swords. Jetting conduit nozzles direct liquid radially from their jetting conduits into the trench after the trench is excavated by the jetting sword cutting nozzles. The jetting conduits direct sufficient liquid into the trench to maintain the mix of trenched soil and water in the trench along the length of the conduits at not more than a super-critical density, extending the distance in which the product being laid in the trench is able to descend in the trench and increasing the likelihood that the product will be buried at the intended trench depth.
摘要:
The present invention provides a means by which an underwater plow can avoid large obstacles that otherwise would prevent the plow from executing its desired path. The underwater plow is released into the water, drops to the sea floor, orients itself, and begins to deploy the sensor array along a pre-programmed path. If the plow encounters a sea floor obstacle, the plow 10 automatically maneuvers to overcome the obstacle and continues deployment of the sensor array. The buoyancy shifting apparatus 110 allows the plow to automatically maneuver. The present invention shifts the center of buoyancy of the underwater plow, thereby allowing the plow to float over obstructions.
摘要:
A fluidified inert material spreading device configured to bury a pipeline in a body of water is configured to travel in the body of water in a travelling direction along and over the pipeline, and has a hull, which extends along a longitudinal axis, houses at least one expansion chamber for fluidified inert material, is connected to at least one feed port to feed the fluidified inert material to the expansion chamber, and has a quantity or number of outlet ports configured to release the fluidified inert material from the expansion chamber, close to the pipeline, and which as a whole define a flow cross section greater than the flow cross section of the feed port.
摘要:
A method of forming a trench in the bed of a body of water, the bed having an initial undisturbed upper surface, comprises suspending a pressure line from a vessel floating on the body of water, the pressure line terminating downwardly in a downwardly directed nozzle. The nozzle is positioned a small distance above the bed, and water is pumped under pressure on board the vessel and is discharged via the pressure line and nozzle downwardly against the bed surface with the water pumped at an overpressure between 0.01 bar and 20 bar and at a flow rate of 0.25 to 20.0 cm per second. The distance of the nozzle above the surface of the bed is not more than ten times the diameter of the water jet defined by the nozzle, preferably about six times the diameter of that water jet.
摘要:
A submarine plough is disclosed comprising a plough share 216 having a cutting edge 207. A heel 220 is arranged rearwardly of the cutting edge 207, and a plough beam 205 has an attachment portion for enabling a towing means 209 to tow the plough to cut a trench in the sea floor. The plough share 216 is pivotable relative to the plough beam 205 to adjust the vertical separation between the cutting edge 207 and the attachment portion. Front skids 204 are arranged adjacent a forward end of the plough beam 205 and hydraulic rams 219 pivot the plough share 216 relative to the plough beam 205. A cable is passed in an arcuate path into the trench rearwardly of the cutting edge 207 and heel 220.
摘要:
A dredging system for removing material from a submerged ground surface includes a dredge head housing having an enclosed, pressurized agitation chamber into which the material to be removed is received from an intake opening. Connected to the housing is a feed line that supplies pressurized fluid, such as water, air or both, to a fluid manifold connected to the housing and within the agitation chamber. The fluid manifold contains cutting outlets for discharging the pressurized fluid onto the material to liquefy the material and lifting outlets for discharging the pressurized fluid so as to urge the liquefied material towards a riser chute. The riser chute is connected to a top cover of the housing and extends above the housing and upwardly discharges the liquefied material into the water column of the body of water.
摘要:
A wear resistant and impact tolerant plow blade comprising a plurality of ternate layers of wear resistant and impact resistant materials. Each layer extends from the leading edges of the plow blade rearwardly and is fabricated of a homogeneous material. Each layer has substantially parallel sides and abuts an adjacent layer or layers to form a substantially seamless plow.
摘要:
A self-guided system for trenching water bottoms for the installation of a pipeline. The preferred embodiment of the present invention teaches a system which is configured to be mounted about the pipeline to be buried, and which further contemplates a uniquely configured, forward mounted trenching/drive mechanism incorporating a cutter wheel generally about the width of the desired trench, the mechanism configured to propel the system as well as trench the desired area. The trenching/drive mechanism of the present invention further includes a high pressure spray array mounted about the frontal cutter wheel area, and a suction/mud pump assembly to the rear of the cutter wheel. The high pressure spray array provides the dual purpose function of loosening the area to be trenched, as well as cleaning and removing the trenched matter from the cutter wheel. The present invention further includes first and second buoyancy chambers which are configured to be uniformly lowered to the lower periphery of the unit frame, to provide skids for utilization of the present system in shallow water. An alternative embodiment of the present invention teaches the incorporation of a framed system similar to that as taught in the present invention, but without the trenching/drive mechanism, and with the addition of a pipe cutter mounted to the rear of the unit frame, for utilization of pipeline recovery and dismemberment operations.