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This invention discloses an antibacterial and antistatic cellulose blended yarn. The raw materials for preparing the blended yarn include natural fibers, deodorizing hemp pulp fibers, antistatic carbon fibers, mineral-modified fibers, and an antistatic agent. The raw materials, by weight, include the following components: 20-30 parts natural fibers, 10-12 parts deodorizing hemp pulp fibers, 10-20 parts antistatic carbon fibers, and 6-8 parts mineral-modified fibers. The natural fibers include bamboo fibers, cotton fibers, and hemp fibers, and possess inherent antibacterial components. The mineral-modified fiber raw materials are nano-zinc oxide and nano-titanium dioxide particles. The advantages of this invention compared to existing technologies are: the antibacterial and antistatic cellulose blended yarn of this invention has a soft and smooth hand feel and improved weaving performance; it retains the unique antibacterial and moisture-wicking functions of hemp fibers, while inheriting the comfortable and skin-friendly characteristics of cotton and viscose regenerated cellulose fibers; and it improves the antistatic performance of the blended yarn.

The application relates to a construction method for ensuring the safety of a shield tunnel underpassing a pipeline, which comprises the following steps: determining the maximum tensile strain increment [Delta epsilon t ] of the pipeline bottom at the intersection position of the shield tunnel and the pipeline plane projection; excavating the foundation, making a turning platform and a tensioning pedestal; installing and fixing a steel strand after forming a working face and providing a pre-tightening force through a jack; pasting a bottom strain gauge for measuring the pipeline longitudinal strain on the pipeline bottom at the intersection position of the shield tunnel and the pipeline plane projection; stopping the shield machine when the strain change cumulative value epsilon t is greater than 0.5 times [Delta epsilon t ]; eliminating epsilon t by gradually tensioning the steel strand through the jack; stopping the strain observation when epsilon t is less than 0.05 times [Delta epsilon t ] within three days; and restoring the ground after grouting in the pipeline longitudinal axis direction for 7-10 days. The application forms an efficient and low-cost construction method for effectively ensuring the safety of the pipeline, and the construction method is unique in process, mature in technology and beneficial to popularization.