Method of manufacturing a flexible pipe

摘要

PCT No. PCT/SU80/00153 Sec. 371 Date May 12, 1981 Sec. 102(e) Date May 6, 1981 PCT Filed Sep. 1, 1980 PCT Pub. No. WO81/00746 PCT Pub. Date Mar. 19, 1981.A flexible pipe comprises an inner supporting pipe (1) made from an elastic material, onto which inner supporting pipe a shaped strip (2) is wound. Said strip (2) has a cross-section profile formed by two stepwise conjugated quadrangular flanges (3) and (4), the height of each of the flanges being equal to a half of the height of the profile. The adjacent turns of the strip (2) partially overlap each other so that the upper flange (3) of one turn is superimposed onto the lower flange (4) of the other flange, and the ends of the flanges (3) and (4) are aligned. An interlayer (5) made from an elastic material is superimposed onto the power frame formed by the strip (2). At least one pair of reinforcing layers (6) and (7) formed by groups of power filaments (8) and (9) is disposed on said interlayer (5), said filaments being parallel to one another and wound in contrary at angles of from 0 DEG to 20 DEG to the axis of the pipe. A protective shell (10) made from an elastic material is superimposed onto the pair of the reinforcing layers (8) and (9). A method of manufacturing a modification of a flexible pipe having an interlayer (5) with a helical expansion (15) comprises the steps of: superimposing a shaped strip (2) onto the inner supporting pipe (1). Said strip (2) is fixed to the supporting pipe (1), whereupon the pipe is stretched along the axis thereof. Then the power frame formed by the strip (2) is covered with the interlayer (5) from an elastic material and fixed to the strip (2). Thereafter, the reinforcing layers (6) and (7) are wound, the protective shell is superimposed thereon, and the supporting pipe (1) is released from the action of the axial tensile load.