A METHOD OF PERMANENTLY IMPROVING THE SURFACE DRAINAGE FROM GROUND FIELDS, PREFERABLY GRASS-COVERED FIELDS, AS WELL AS AN APPARATUS FOR USE BY THE METHOD

摘要

By a method of permanently improving the surface drainage from a playing field, the ground is cut in a network of narrow, vertical trenches, which are filled with a porous material whereafter the ground cut up is divided into fine particles and distributed across the trenches and in the spaces therebetween. In this manner it is possible in a simple manner to improve essentially the surface drainage. An apparatus for use by the method comprises a framework (1) which can be suspended in the tree-point suspension of a tractor. A horizontal, transverse, rotatable main shaft (4) is mounted on the framework. One or more parallel cutting wheels (5) displaceable to the side are unpivotably mounted on the main shaft, and each cutting wheel comprises a plurality of cutting shovels (6) mounted thereon. The cutting wheel furthermore comprises power transferring means (7) for the transfer of the movement of the power take-off of the tractor for the rotation of the main shaft (4) with cutting wheels (5). The apparatus comprises furthermore two supporting wheels (11) connected to the framework, a scraper (12) situated behind each cutting wheel (5), and a gravel spreader (13) located above said cutting wheels. This gravel spreader is also driven by the tractor through the power transferring means (7) and releases the gravel to the rear above a transverse releasing roller. Subsequently, the gravel is transferred to a hopper unit (15) mounted on the gravel spreader, said hopper opening on to a jointed, horizontally and vertically movable double hopper (16) associated with each cutting wheel (5), whereby said double hopper can release the gravel in the trenches cut up. The framework (1) includes a detachable screening (20) secured above the cutting wheels (5) and the power transferring means (7). The entire framework with associated parts mounted thereon can be raised and lowered in such a manner that cutting wheels, scrapers, hoppers, and supporting wheels are raised from the ground, or so that cutting wheels, scrapers, and hoppers are lowered into said ground while the supporting wheels rest on the ground. As a result, an apparatus is obtained which implies that it is possible in an easy and quick manner to produce some trenches filled with porous material on a grass-covered playing field, said trenches improving the surface drainage.