PROBLEM TO BE SOLVED: To secure in-pipe resistance required to force-feed in a filled state over the whole length of a force-feed pipe without making aggregate in concrete go too far ahead by forming a concrete force-feed pipe of front and rear horizontal curved parts of a spiral part, and straight pipe parts at the tips of both horizontal curved parts. ;SOLUTION: A spiral part 1 is formed in a state of a pipe of specified length being wound once so that its boundary faces to front and rear horizontal curved parts 2, 2' are opposed parallelly, that is, in a state of being wound by 360°. The horizontal curved parts 2, 2' with straight pipe parts 3, 3' formed continuously at the tips are curved in such a way that an angle formed by the boundary faces to the straight pipe parts 3, 3' and the boundary faces to a spiral part 1 is 45°, and the axes of the straight pipe parts 3, 3' form a straight line C. This constitution results in securing in-pipe resistance required to force-feed in a filled state over the whole length of a force-feed pipe without making the aggregate in concrete go too far ahead.;COPYRIGHT: (C)1997,JPO
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