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明斯克КПД第二振动挤压钢筋混凝土压力管厂的生产经验证实,管子试压时,一般在承口部分出现裂缝。其原因是生产和试压管子的特殊工艺所决定。众所周知,管子承口的成型靠的是承口橡胶模,它具有一定的弹性和刚度,从而使承口模范围内环筋或斜筋的应力不足,因而与管身相比,承口部分的抗裂性偏低。充水挤压时,承口模变形类似于在内压力P_1和外压力P_2共同作用下厚壁管的变形。P_1为挤压力,由压力表控制;P_1P_2。
The production of the КПД second vibratory-squeezing reinforced concrete pressure pipe plant in Minsk confirmed that when the pipe is pressure-tested, cracks generally appear in the socket section. The reason for this is determined by the special process of producing and testing the tubes. As we all know, the formation of the tube socket is based on the socket rubber mold, which has a certain degree of elasticity and rigidity, so that the stress of the ring ribs or oblique ribs in the socket mold area is insufficient. Therefore, compared with the pipe body, the socket part Crack resistance is low. During water-filled extrusion, the deformation of the socket die is similar to the deformation of the thick-walled pipe under the combined action of the internal pressure P_1 and the external pressure P_2. P_1 is a squeeze force and is controlled by a pressure gauge; P_1P_2.