Space Platform by Murray Leinster

For an instant, in mid-air, Joe was incongruously aware of all the noises in the Shed. The murky, girdered ceiling still three hundred feet above him. The swelling, curving, glittering surface of steel underneath. Then he struck. He landed beside the lean man, with his left arm outstretched to share his impetus with him. Alone, he would have had momentum enough to carry himself up the slope down which the man had begun to descend. But now he shared it. The two of them toppled forward together. Their arms were upon the flat surface, while their bodies dangled. The feel of gravity pulling them slantwise and downward was purest nightmare.

But then, as Joe's innards crawled, the same stocky man who had knocked the lean man back was dragging frantically at both of them to pull them to safety.