管道修复用涤纶-苎麻非织造物/环氧树脂复合材料厚度设计

管状涤纶-苎麻非织造物/环氧树脂复合材料的厚度大小对管道修复后的介质过流能力、内衬材料强度会产生一定的影响，本文根据曼宁方程和复合材料管道设计原则建立了厚度、过流能力及强度的计算公式。采用响应曲面法优化涤纶-苎麻非织造物的制备工艺，在单因素试验的基础上，根据Box-Behnken试验设计原理，选取混杂比、纤网定量、针刺密度3个因素，依据回归分析方程来确定各制备工艺的主要影响因素，以涤纶-苎麻混杂非织造物的厚度和强度为响应值作响应面和等高线图，得出涤纶-苎麻非织造物制备的最优工艺条件（混杂比为0.8，纤网定量为600 g/m2，针刺密度为300 needle/cm2）。在该工艺下，涤纶-苎麻非织造物的厚度为4.14 mm，纵向拉伸强度为2.81 MPa，横向拉伸强度为1.72 MPa，接近理论值，表明响应曲面法具有实际应用价值；结合涤纶-苎麻非织造物/环氧树脂复合材料厚度、强度来验证厚度、过流能力及强度等计算公式的合理性，发现满足管道修复后过流能力的前提下，较薄的涤纶-苎麻非织造物/环氧树脂复合材料的强度能达到翻衬修复排水或排污管道工作压力的需求。 

Thickness design of polyester-ramie/epoxy nonwoven composite applied on pipeline rehabilitation

The thickness of tubular polyester-ramie/epoxy nonwoven composites has a certain influence on the flow capacity and strength of the lining material after pipeline rehabilitation. Therefore, the calculation formulas of thickness and overcurrent capability were established based on manning equation and the design criterion of composite pipe. The formula for calculating the strength was also established. The response surface method was used to optimize the preparation process of polyester-ramie nonwovens. Based on the single factor, according to the Box-Behnken test design principle, the three factors of hybrid ratio, fiber web quantification and needle density were selected according to the regression analysis equation. To determine the influencing factors of each process, the thickness and strength of the polyester-ramie nonwovens were used as the response surface and the contour map. The optimum process conditions for the preparation of polyester-ramie nonwovens are as follows:the hybrid ratio is 0.8, the fiber web quantification is 600 g/m2 and the needle density is 300 needle/cm2. Under the process, the polyester-ramie nonwovens have a thickness of 4.14 mm, a longitudinal tensile strength of 2.81 MPa, and a transverse tensile strength of 1.72 MPa, which is close to the theoretical value, indicating that the response surface method has practical value. Combined with polyester-ramie/epoxy nonwoven composites, the thickness and strength were used to verify rationality of the calculation formulas such as thickness, overcurrent capability and strength. It is found that the strength of the thinner polyester-ramie/epoxy nonwoven composites can meet the pressure requirements of the lining for repairing the drainage or sewage pipeline under the premise of the over-flow capability of the pipeline after repair.