A trench wall apparatus includes a base frame held at its top end by a holding means held by at least one soil excavation means, which is positioned at a bottom end of the base frame. When soil is excavated while forming the trench, the trench wall apparatus is held by a clamping means that includes at least two clamping elements on opposite sides extended laterally by at least one actuating cylinder, whereby at least one part of the trench wall apparatus is clamped in the trench, and a pressing means applies a pressing force on the at least one soil excavation means. The clamping elements and clamping cylinder are positioned on an intermediate frame displaceably mounted along the base frame. The intermediate frame is clamped and fixed to the ground by the clamping means. The base frame having the soil excavation means is pressed downward by the pressing means.

A vehicle for producing trenches in the ground is provided. The vehicle generally includes a chassis having a motor unit, a controllable digging device mounted on the chassis to dig a trench, and a controllable suctioning and collecting device configured to suction and collect rubble produced during the digging of the trench. The vehicle may include a driver station for the movement on the ground of the vehicle during a transfer phase, and a portable and remote control unit configured to enable an operator to remotely control the digging device, the suctioning and collecting device, and the advancing of the vehicle during digging in the course of a working phase.

The disclosure relates to a boring machine for producing a trench in the ground, comprising a chassis that extends in a longitudinal direction, the chassis having a lower end, the machine including a boring device mounted at the lower end of the chassis, the boring device including: a first boring member which is rotary about a first axis of rotation; a second boring member which is rotary about a second axis of rotation, the second axis of rotation and the first axis of rotation extending in a plane perpendicular to the longitudinal direction;

wherein the first axis of rotation is inclined with respect to the second axis of rotation.

The application relates to a modular slurry wall cutter for preparing a slurry trench that is connectable to a carrier machine, said slurry wall cutter having a frame and at least one cutting tool arranged at the frame to break up soil material. The frame here comprises an upper frame part, a middle frame part, and a lower frame part that are releasably connectable to one another, with the upper and lower frame parts being releasably connectable to one another both directly and via the middle frame part that can be arranged therebetween. The application further relates to a carrier machine, such as to a cable excavator, having a slurry wall cutter in accordance with the application.

A hydraulic control for an attachment on a work vehicle. The attachment is mounted on the chassis of the work vehicle and movable between a first position and a second position. A hydraulic cylinder is operable to power movement of the attachment. A fluid circuit communicates with the hydraulic cylinder and is configured to carry hydraulic fluid. A fluid reservoir is in communication with the fluid circuit. Accumulators that are in communication with the fluid circuit automatically store and release hydraulic fluid in response to movement of the attachment. A valve assembly controls fluid communication between the fluid reservoir and the fluid circuit in response to movement of the attachment to its second position.

The application relates to an excavation machine including a cutting head with a first drum and a second drum positioned side by side, in proximity to one another, and configured to turn respectively around a first and a second axis of rotation, the first drum and the second drum including, according to their respective axis of rotation, a proximal end connected to the cutting head, and a distal end opposite to the proximal end. The application also relates to a cutting disc for an excavation machine of this type, as well as a corresponding cutting method.

A spring-loaded feeding device for a ditch digging apparatus. The spring-loaded feeding device includes a shaft rotatably mountable on a frame and rotatable in a direction of rotation, and one or more feeder paddle assemblies. each feeder paddle assembly comprises a bracket on the shaft extending radially outward, the bracket comprising a pivot axis proximate the shaft and a spring-connection point spaced apart from the pivot axis. The feeder paddle assembly also has a feeder paddle with a first end near the shaft and a second end spaced apart from the first end, the feeder paddle extending radially outward from the shaft from the first end to the second end, the feeder paddle being pivotally coupled to the bracket at the pivot axis and also coupled to the bracket by a spring positioned between the feeder paddle and the spring-connection point of the bracket.

A spring-loaded feeding device for a ditch digging apparatus. The spring-loaded feeding device includes a shaft rotatably mountable on a frame and rotatable in a direction of rotation, and one or more feeder paddle assemblies. each feeder paddle assembly comprises a bracket on the shaft extending radially outward, the bracket comprising a pivot axis proximate the shaft and a spring-connection point spaced apart from the pivot axis. The feeder paddle assembly also has a feeder paddle with a first end near the shaft and a second end spaced apart from the first end, the feeder paddle extending radially outward from the shaft from the first end to the second end, the feeder paddle being pivotally coupled to the bracket at the pivot axis and also coupled to the bracket by a spring positioned between the feeder paddle and the spring-connection point of the bracket.

A system for uncovering a trench. The system comprises several subsystems, including a work machine and a frame for providing a seal with the surface to be trenched with a saw blade contained therein. The blade is supported on a hub which is slidably movable relative to the frame by operation of a linear actuator, which may be a hydraulic cylinder or the like. The vertical location of the blade within the frame is continuously adjustable to create a deeper or shallower trench. A monitoring system is provided to monitor the vertical location from an operator station.

Provided is a cutting wheel assembly comprising: a frame having two spaced support pillars, each having an intermediate portion at an angle to upper and lower portions; a pair of outer cutting wheels arranged either side of an inner cutting wheel all supported on the lower portions of the support pillars about a common axis of rotation; each cutting wheel having a central hub portion about which an annular cutting portion is provided having a respective cutting diameter; the inner cutting wheel having a different cutting diameter to that of the outer cutting wheels, and the central hub portions of neighboring cutting wheels defining a respective gap in which the intermediate portion of a respective pillar is received; at least one of the annular cutting portions of the inner and/or the outer cutting wheels having one or more rim portion(s) that overlap each gap so the annular cutting portions provide a cutting action along a continuous line of cut.