| 摘要 |
A method and apparatus for inserting joint strip material in a slab of plastic concrete or the like. The apparatus includes an elongated frame for orientation transversely of the slab and transportable in successive movements longitudinally of the slab. The frame mounts a cart adapted to be driven along the frame and carrying a strip guide or tube movable through the plastic concrete to embed the joint strip material. The cart also carries a pan which rides upon the concrete surface behind the strip guide to sense the height of the concrete, initiate operation of a means to adjust the height of the strip guide accordingly, and also smooth the concrete surface. This controls the depth of insertion of the strip material ans smooths the surface of the concrete disrupted by the insertion. The frame includes side forms engageable with the side edges of the concrete slab to preserve their integrity during the insertion operation, the forms being automatically retractable out of such engagement immediately upon longitudinal movement of the main frame. The joint strip material is unwound from a reel upon a strip unreeling traverse of the cart, held in position by clamping arms during an opposite insertion traverse of the cart, and severed upon completion of the insertion traverse. In a second embodiment feed wheels are used instead of the clamping arms. |
