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环筋中的应力振动挤压管在生产过程中,用由压力表控制的表压力P_M来张拉环筋、克服弹簧螺栓的变形和橡胶套的张力P_p。根据试验资料,表压力波动范围为0.2～0.4公斤/厘米~2。因为环筋沿圆周直径分布,所以环筋受到的压力为: P_a=P_M·(D_Y)/(D_a)-P_P (1)式中D_Y-管内径;D_a-环筋的圆周直径。在有效压力作用下,一圈环筋的绝对伸长值为: Δ_a=(P_a·2π·r_a~2)/(E_a·f_a/S) (2) Δ_a也可由下列条件算出:钢筋的刚度
In the production process of the stress vibration squeeze tube in the ring ribs, the ring ribs are stretched by the gauge pressure P_M controlled by the pressure gauge, and the deformation of the spring bolt and the tension P_p of the rubber sleeve are overcome. According to the test data, the table pressure fluctuation ranged from 0.2 to 0.4 kg/cm~2. Because the ring tendons are distributed along the circumference, the pressure on the ring tendons is: P_a = P_M · (D_Y)/(D_a) - P_P (1) where D_Y-tube inner diameter; D_a - circumferential diameter of the ring ribs. Under the effect of the effective pressure, the absolute elongation of a ring of ribs is: Δ_a=(P_a·2π·r_a~2)/(E_a·f_a/S) (2) Δ_a can also be calculated from the following conditions: