用管芯内振近牵引式拉模成型机生产预应力砼多孔板工法

<正> 陕西省第四建筑工程公司研制的管芯内振近牵引式拉模成型机,与国内同类机型相比,具有不更换模具即可生产两种宽度、不同规格的预应力砼多孔板的特点,已被西北地区几十个砼构件厂采用,但至今尚无相应完整、系统的生产工艺科学管理方法。为了正确指导施工,保证构件生产质量。

渠道削模衬砌技术在泾惠渠灌区中的应用

近年来,各地对灌区水利工程建设的投入持续加大,大中型灌区对渠道衬砌的投入也在持续加大。大部分末级渠道衬砌都是以人工回填、人工削模等人工作业为主,配合U型衬砌机拉模。这种依赖人工作业的施工方式费时费力,误差也较大,断面大小不一、边角参差不齐,易产生局部渗漏及回填体不紧密的情况,以及人工回填需要为人工挖掘“让路”等问题。基于此,提出一种利用机械开挖切削的全断面回填方式,提升工作效率,可以有效防止上述问题的发生。结合工程的实际成效,论述此种技术的推广价值。以期为同类渠道衬砌作业提供实践经验。

金属塑料复合管道

本成果采用金属骨架——塑料复合管道，是以钢丝为增强体，塑料为基体，利用拉模成型工艺，在生产线上连续加工复合而成的新型防腐管道。该产品质量轻、强度高、耐腐蚀，使用寿命长。管道内壁光洁，输送介质阻力小，可广泛使用于石油、化工、船舶、通讯、市政和民用建筑等领域。与其它同类产品相比，其性价比高。

Surface borehole synthesis tension deformation fracture time-space rule

In order to release the tension and shear effect of the superjacent rock strata movement during excavation in coal mine,protect the surface borehole case from fracturing fast and make a good use of the surface borehole during goaf methane drawing,a common synthesis tension deformation fracture model was set up based on the synthesis tension effect of the rock strata,and the deformation rule of the surface borehole case with time and space was researched.The results suggest that,to reduce the deformation the surface borehole should be built between the boundary of the stope and the knee of subsidence curve.At the same time,a 3DEC simulation model and an engineering example were carried out to examine the rules of theoretical model.The result suggests that the model and the rules accord to the test and have good building and protection engineering application values to the surface borehole.