成都蜀龙五期预制装配式综合管廊拼缝橡胶密封件形式研究

Study of Rubber Seal Forms of Joint of Prefabricated Utility Tunnel of Phase Ⅴ of Shulong Street in Chengdu

为使橡胶密封件在拼缝处张开量为10 mm、错位量为12 mm以及在闭合压缩力尽可能小的情况下仍能够满足成都市蜀龙五期预制装配式综合管廊0. 21 MPa的防水要求,建立3次Ogden橡胶本构模型,对圆形孔洞和类三角形孔洞2种形式的橡胶密封件进行数值模拟,比较2种形式下橡胶密封件的装配力大小,选择装配力小的橡胶密封件进行防水性能和闭合压力试验。结果表明:1)圆形孔洞橡胶密封件能够满足蜀龙五期综合管廊的防水要求,密封件闭合压缩力为28. 55 k N/m。2)当预制块拼装间隙张开量(错位量)较小时,错位量(张开量)的增大会迅速减小橡胶密封件的耐水压力,且张开量对橡胶密封件耐水压力的影响比错位量大。3)预制块拼装间隙张开量越接近0 mm,加载等间距张开量所需装配力越大。

The waterproofing ability of 0.21 MPa of prefabricated utility tunnel of PhaseⅤof Shulong Street in Chengdu should be guaranteed under the conditions of the rubber seal opening of 10 mm,dislocation of 12 mm and low closed compressive force.Hence,2 forms of rubber seal,i.e.circular holes and quasi-triangle holes,are numerically simulated by establishing triple Ogden constitutive model of rubber;the assembly forces of the two forms of rubber seal are compared,and the rubber seal with small assembly force is selected to conduct waterproof test and closed pressure test.The test results show that:(1)The rubber seal with circular holes can meet the waterproofing requirement of the project;and the closed pressure of rubber seal is 28.55 kN/m.(2)When joint opening/dislocation of precast segment is small,the waterproofing pressure decreases rapidly with the increase of dislocation/joint opening;and the joint opening has a greater influence on waterproofing pressure of rubber seal than dislocation.(3)The smaller the joint opening,the larger the assembly forces.