小口径排泥管输送加气技术现场试验研究

Field test of aeration technology for small-diameter dredging pipe transportation

小型疏浚工程通常采用小型绞吸船进行施工,小型绞吸船由于泥泵功率较小,导致输送排距无法满足需求,本文探讨小口径排泥管加气技术对管道排距的影响。现场试验依托石门澳蓄滞浚清淤吹填工程,在吹填管上相距300 m的2个位置进行试验,分别使用空压机直接加气和射流器混合加气两种方式。试验结果表明,管道加气技术能够有效提升输送排距。空压机直接加气效果比射流器混合加气效果更好,加气点靠近船端位置效果最好,平均增加排距22.2%,射流器混合加气平均增加排距12%。现场试验验证了疏浚排泥管加气技术的可行性,为疏浚工程排距问题提供了新的解决思路。

Small-scale dredging projects usually adopt small cutter suction dredgers for construction. Nevertheless, the transportation and discharge distance of such dredgers fail to meet the demands due to the small power of their dredge pump. This paper explores the impact of the aeration technology for small-diameter dredging pipes on the pipeline’s discharge distance. The field test relies on the Shimen’ao storage, retention, dredging and reclamation project and takes place at two positions 300 m apart on the reclamation pipe in two modes, namely direct aeration with an air compressor and mixed aeration with a jet aerator. The test results show that the proposed pipeline aeration technology can effectively improve the transportation and discharge distance. Specifically, direct aeration with an air compressor produces a better result than that of mixed aeration with a jet aerator, especially when the aeration point is close to the end of the ship, and achieves an average increase of 22.2% in discharge distance, while mixed aeration with a jet aerator increases the discharge distance by 12% on average. The field test verifies the feasibility of the aeration technology for dredging pipes and provides a new solution to the discharge distance problem in dredging engineering.