北京工人体育场密实砂卵石层水泥土复合管桩设计与施工

引用文献：

王猛李欣鞠竹徐文汉. 北京工人体育场密实砂卵石层水泥土复合管桩设计与施工[J]. 建筑结构，2023，48（06）：47-52，5.

WANG Meng LI Xin JU Zhu XU Wenhan. Design and construction on cement-soil composite pipe pile in dense sand pebble layer of Beijing Workers Stadium[J]. Building Structure，2023,48（06）：47-52，5.

作者：王猛李欣鞠竹徐文汉

单位：北京建工集团有限责任公司河北省土木工程灾变控制与灾害应急重点实验室华北科技学院建筑工程学院

摘要：水泥土复合管桩一般应用于软土地基或粉土地区，在砂卵石地区应用较罕见。以北京工人体育场改造复建工程为例，通过研究水泥土桩在密实砂卵石层的成桩工艺和预制管桩静力压桩工艺，重点介绍了水泥土复合管桩在密实砂卵石层的应用。根据现场实际情况，在密实砂卵石层旋喷形成直径较大、混合均匀、强度较高的水泥土外桩，水泥土外桩完成后，在桩内同心静力压桩植入预制芯桩，形成水泥土复合管桩，解决了密实砂卵石层中水泥土外桩难以成桩的难题。通过对抗拔承载力和桩头进行设计，设计出一种桩底抗拔装置，并提出桩头钢筋后锚固技术，有效提高了单桩抗拔承载力及施工效率。对水泥土复合管桩施工技术进行了质量、经济及环境效益分析。结果表明，密实砂卵石层水泥土复合管桩施工技术避免了桩基施工中混凝土供应不及时和后期桩头大量剔凿的问题，减少了材料消耗，节能环保。

关键词：北京工人体育场；密实砂卵石层；水泥土复合管桩；预制芯桩；水泥土外桩；施工技术；

作者简介：王猛，学士，高级工程师，主要从事大型体育场馆施工技术研究，Email:13693637969@163.com。鞠竹，博士，高级工程师，主要从事大跨空间结构研究，Email:juzhu@ncist.edu.cn。

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Design and construction on cement-soil composite pipe pile in dense sand pebble layer of Beijing Workers Stadium

WANG Meng LI Xin JU Zhu XU Wenhan

(Beijing Construction Engineering Group Co., Ltd. Hebei Key Laboratory of Civil Engineering Catastrophe Control and Disaster Emergency Response Architectural Engineering College,North China Institute of Science and Technology)

Abstract: Cement-soil composite pipe pile is generally used in soft soil foundation and silty soil area, while it is rarely used in sand pebble area. Taking the reconstruction project of Beijing Workers Stadium as an example, the application of cement-soil composite pipe pile in the dense sand pebble layer was mainly introduced by studying the forming process of cement-soil pile and the static pressing pile process of precast pipe pile. According to the actual situation on site, cement-soil external pile with large diameter, uniform mixture and high strength was formed by rotary spraying in the dense sand pebble layer. After the completion of cement-soil external pile, prefabricated core pile was implanted into concentric static pile to form cement-soil composite pipe pile, which sloves the problem that cement-soil external piles is difficult to form in dense sand pebble layer. Through the design of uplife bearing capacity and pile head, a kind of pile bottom pull-out device was designed and the post-anchorage technology of pile head reinforcement was proposed, which effectively improves uplife bearing capacity and construction efficiency of the single pile. The construction technology of cement-soil composite pipe pile was analyzed in terms of quality, economy and environment. The results show that the construction technology of cement-soil composite pipe pile in dense sand pebble layer avoids the problem of not timely supply of concrete in pile foundation construction and a large number of pile head chiselling in late stage, which reduce material consumption, and save energy and helpful for environmental protection.

Keywords: Beijing Workers Stadium; dense sand pebble layer; cement-soil composite pipe pile; prefabricated core pile; cement-soil external pile; construction technology

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