Patent
1977-01-31
1978-07-18
Taylor, Dennis L.
F16L 102, E02D 2910
Patent
active
041007514
ABSTRACT:
A machine for laying continuous concrete pipe in an open trench. The machine has interior and exterior pipe forming molds about which fresh concrete is poured. Reciprocating flexible diaphragms compact concrete poured in the trench adjacent the trench bottom to prevent the formation of voids without causing vibrations. The exterior mold has surfaces in continuous contact with side walls of the trench to thereby guide the mold aong and center them with respect to the trench. The interior mold includes a plurality of arcuate forms which remain in place after the pipe has been formed until the concrete has hardened. The forms are spread apart so that the finished pipe is slightly oblong in a horizontal plane. Pipe spreaders support the forms in their spread configuration while the concrete hardens and spreaders contact an inside of the forms at multiple contact points arranged so that the spreader can be pivoted into a position in which it contacts the form at no more than two points to facilitate the removal of the spreaders from the finish hardened pipe. Variable speed concrete tampers are positioned below a concrete intake hopper to facilitate the feeding of fresh concrete from the hopper to the bottom of the trench. A rocker arm reciprocates the tampers and is positioned beneath the exterior mold means. The hopper is removable and when done the high point of the pipe laying machine protrudes less than 4 inches above the top surface of the exterior mold, allowing the pipe laying machine to pass beneath utility lines and the like crossing the trench provided the clearance between the line and the top of the exterior mold does not exceed 4 inches or that such clearance can be gained by a temporary deviation of not more than 4 inches from the established grade of the pipe line.
REFERENCES:
patent: 2406025 (1946-08-01), Moor
patent: 2731698 (1956-01-01), Tunsen
patent: 2937429 (1960-05-01), Livingston
patent: 3106760 (1963-10-01), Tunsen
patent: 3113364 (1963-12-01), Blixt
patent: 3205550 (1965-09-01), Martin
patent: 3252198 (1966-05-01), Fuller
patent: 3785759 (1974-01-01), Johnson et al.
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