| 摘要 |
FIELD: construction. ^ SUBSTANCE: in method to remove grass coat and to return it into initial position, consisting in displacement of grass coat relative to rigid base with the help of driving mechanisms, substrate of grass coat is arranged directly on rigid base, which is equipped with systems of drainage and heating. To remove grass coat from stadium field, one of end edges of grass coat substrate is fixed with the help of arched pads to rollers with cylindrical shape of shells. Rollers are fixed on axes with flanges at the ends and are arranged with gaps between each other parallel to end edge of coat. Axes of rollers are joined to each other by means of intermediate axes with similar flanges at the ends. Ends of axes of extreme rollers are arranged with lugs. Both lugs are connected with trailer accessories of traction units, which are moved with identical speeds along side edges of football field to its opposite end with provision of swinging of joined rollers and winding of substrate on them with a grass coat fixed on it. At the end of field the rolled substrate with grass coat is placed on trolley, on which specified roll is taken outside the stadium and is again rolled with the help of traction units. Returning grass coat into initial position is done in a similar manner, but in a reverse order. At the same time maximum diametre D0 of roll from rollers with wound grass coat substrate is determined according to the following formulas: D0=D+2(n-1)a,n=[0.25(D/a-1)2+L/(Ça)]0.5-0.5(D/a-1), where Ç - number of grass coat substrate turns on rollers, D - diametre of rollers, m, a - average thickness of coat in wound condition, m, L - length of coat, m. ^ EFFECT: simplification and cheapening of method, reduced labour intensiveness and time required to do operations of football field extension and returning in initial position. ^ 1 cl, 1 dwg |
