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为克服传统预应力管桩施工过程中引起的挤土效应、噪音等消极影响,扩大预应力管桩的适用范围,研究开发了新型的中掘预应力管桩施工技术。通过现场足尺试验,对同一场地相同规格的中掘预应力管桩、锤击法管桩进行静载荷试验,并通过桩身应力量测设备研究其桩身荷载传递规律,对比分析得出中掘预应力管桩的竖向抗压承载性能以及荷载传递规律。试验结果表明,中掘预应力管桩竖向荷载传递规律与其他桩型相似;中掘预应力管桩施工过程中对桩侧摩阻力产生了一定的削弱,实测得出的极限侧摩阻力值小于锤击桩,但其桩端旋喷注浆技术可以有效提高桩身承载能力;中掘预应力管桩的单桩极限承载力与同一场地的锤击桩较为接近,具有一定的推广应用价值。
In order to overcome the negative effect of squeezing effect and noise caused by the construction of traditional prestressed pipe piles and to expand the application range of prestressed pipe piles, a new type of construction technology of middle-digging prestressed pipe piles was researched and developed. Through on-the-spot full-scale test, static load test is carried out for middle-pitched prestressed pipe pile and percussive pipe pile with the same specifications in the same site and the load transfer rule of pile body is studied through pile stress measuring equipment. Excavation of vertical prestressed pipe pile bearing capacity and load transfer law. The test results show that the vertical load transfer law of the prestressed pipe piles in medium excavation is similar to that of other piles. During the construction of the prestressed pipe piles, the friction on the pile side is weakened. The measured ultimate frictional resistance But less than the hammer pile, but its end of the jet grouting technology can effectively enhance the pile bearing capacity; in the prestressed pipe pile single pile ultimate bearing capacity and the same site of the hammer pile is closer to a certain value of popularization and application .