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本文以三明市支于粒状土层沉管夯扩桩的使用情况与检测结果为依据,对技术经济问题进行讨论。实践证明,该桩型具有穿透能力强、施工速度快、单桩负荷大、工程造价低等优点。该桩型不仅在沿海沉积地层适用,对山区埋藏粒状土层的河流阶地及山前冲洪积扇地带尤其适用.按照三明已有的设计,取单桩承载力标准值R_k=750KN时,桩基造价,对多层住宅约为沉管灌注桩的3/4、砼预制桩的2/3、人工挖孔桩的1/2.根据检测结果,可望进一步降低。因而该桩型具有较高的推广价值。
In this paper, the technical and economic issues are discussed based on the use and test results of the rammed piles in Sanming City. Practice has proved that the pile type has the advantages of strong penetration, fast construction speed, large single pile load, and low construction cost. This type of pile is not only suitable for use in sedimentary strata in the coastal area, but is also particularly suitable for river terraces and mountain piedmont alluvial fan belts where mountainous areas are buried. In accordance with Sanming’s existing design, when the standard value of single pile bearing capacity is R_k=750 KN, piles The base construction cost is about 3/4 of the immersed cast-in-place piles, 2/3 of the prefabricated piles, and 1/2 of the artificially excavated piles for multi-storey houses. Based on the test results, it is expected to be further reduced. Therefore, the pile type has a higher promotion value.