Abstract: A structure for a high-speed chain trencher permitting entrapment of trenched soil and conveyance thereof to a lateral position away from the trench leaving a clean trench so that drainage tubing and compacted sand fill may be installed in the trench free of loose soil and without the necessity of additional trench preparation after passage of the trenching machine. The conditions of usage of the present invention are particularly useful in installing drainage beside highways for enhancing pavement life.

Abstract: An apparatus for laying elongated, flexible tubing in a trench and adapted to be secured to a trenching boom carried by a vehicle. The apparatus includes an upwardly open hopper having a forward end adapted to be secured to the trenching boom in trailing relation thereto, and a trailing end. A first partition is adjacent the forward end and defines a flexible tubing tunnel, the tunnel opening to the top and bottom of the hopper so that flexible tubing may enter the top of the hopper and exit the bottom thereof behind the trenching boom. A second partition is located in the hopper rearwardly of the first partition and defines first and second fill receiving compartments. The compartments open upwardly to receive fill material such as sand, and downwardly to release fill material rearwardly of the tunnel.