A pipeline padding vehicle for supplying earth of a fine consistency to cover and pad a pipeline disposed in a trench has a longitudinal conveyor, a vibrating screen to receive earth from the conveyor, and a padding material discharge conveyor beneath the screen to receive material therefrom mounted to pivot about a vertical axis from a position in which it is longitudinally aligned with the vehicle frame to a position transverse of the frame. A sub-frame mounts the vibrating screen and discharge conveyor on the vehicle for fore and aft swinging movement about a generally horizontal axis transverse to the longitudinal extent of the vehicle frame.

A self-propelled screening apparatus (10) having a support frame (11), endless crawler tracks (15) supporting the frame (11), a hopper (13) and screen or screens (12) mounted on the support frame (11), and a discharge conveyor (14) mounted on the frame (11) and operable to discharge at least one separated portion of screened material (received from the screen) along a required deposition zone while the apparatus is moving.

A pipeline padding machine for use with a motorized carrier is mounted on a flat bed trailer adapted to be hitched to the carrier. Collector apparatus mounted beneath the screening apparatus receives the earth from a discharge at the bottom of the screening apparatus and conveys it to its discharge end which is located laterally of the carrier-trailer when the screening apparatus is in a transverse operational mode. A delivery apparatus pivotally mounted at a receiving end beneath the discharge end of the collector apparatus may in turn receive the earth discharged for delivery at greater distances from the screening apparatus. This delivery apparatus may be supported at its discharge end from the carrier or the trailer so that its discharge end may be located laterally of the carrier-trailer at a selected distance from the carrier-trailer within a variable range of distances. The screening apparatus preferably has two transverse operational modes so that undesirable objects and materials may be discharged to either side of the carrier-trailer depending on the mode selected. The collector apparatus is preferably reversible, so that relatively fine materials may be optionally discharged to either the same or the opposite side of the machine as the undesirable materials and objects. The delivery apparatus preferably is pivotally connectable beneath either end of the collector apparatus so that fine materials can be delivered to distant points from either side of the padding machine in either transverse operational mode and regardless of the direction of the collector apparatus.

Disclosed is an excavating, sieving and grading device for a working crawler arranged such that each pair of first and second right and left legs 14, 14a and 17, 17a are vertically disposed to a bucket main body 7, the first right and left legs are connected to each other by a first reinforcing member 15, the second right and left legs are connected to each other by a second reinforcing member 18, and first and second guide rollers 16, 19 for supporting and guiding a first guide rail 21 disposed on the bottom surface of a movable frame 12 are provided on the first and second reinforcing members. With this arrangement, the movable frame provided with the sieve net is stably supported and guided to the bucket main body to thereby increase the strength of the excavating, sieving and grading device.

In combination a screen, a shaker, a conveyor and carbody device which is attachable to a vehicle of choice, such as an hydraulic excavator, a backhoe, etc., and when installed thereon allows the vehicle to perform as a padding machine.