现浇大直径基坑支护能量蓄水管桩技术研发

夏京 胡庄 张皖湘 汪磊 胡俊

摘 要：為充分利用环境设施、节约资源和能量，综合考虑基坑支护系统、地温交换系统和雨水调蓄系统形成大直径基坑支护能量蓄水管桩新技术。该技术是将大直径管桩运用到基坑支护中，该管桩作为支撑结构可提高基坑安全性能;同时其空心管状结构可实现利用地下浅层地温能对上部建筑空间进行供暖或制冷;另外其空心管状结构也可储存雨水，符合海绵城市理念。通过施工工艺介绍和技术对比，主要得出：该技术可大幅提高支护体抗弯能力，节约造价，可利用地下浅层地温能对建（构）筑物进行供暖或制冷，同时符合海绵城市的理念;以直径2 000 mm、壁厚200 mm管桩和直径1 200 mm实心桩进行基坑支护方案比较，直径2 000 mm、壁厚200 mm管桩的抗弯刚度（惯性矩）提高了3.6倍，造价节省1/3;当基坑面积为100 m×100 m时，降低二氧化碳排放量22.7 t;降温效果对比中，加冰情况下，能量交换系统降温效果与空调运行时差别不大，但用电量仅为空调系统的1/6。所得结果可为今后类似工程提供技术参考依据。

关键词：基坑支护;地温交换;海绵城市;大直径管桩

中图分类号：TU46    文献标识码：A   文章编号：1006-8023（2021）01-0095-10

Abstract：In order to make full use of environmental facilities， save resources and energy， a new technology of large-diameter foundation pit retaining and retaining energy storage pipe pile is formed by comprehensive consideration of foundation pit retaining system， ground temperature exchange system and rainwater storage system. This technology is to apply large-diameter pipe pile to foundation pit retaining. As a supporting structure， the pipe pile can improve the safety performance of foundation pit. At the same time， the hollow tubular structure can make use of underground shallow ground temperature to heat or cool the upper building space. In addition， its hollow tubular structure can also store rainwater， in line with the sponge city concept. Through the introduction of the construction technology and the comparison of the technologies， it is concluded that the technology can greatly improve the bending resistance of the support body， save the cost， and can use the underground shallow ground temperature energy to heat or cool the building （structure）， at the same time in line with the concept of sponge city. Comparing the foundation pit support schemes with pipe piles with a diameter of 2 000mm and a wall thickness of 200mm and solid piles with a diameter of 1 200mm， the bending rigidity （moment of inertia） of pipe piles with a diameter of 2 000mm and a wall thickness of 200mm was increased by 3.6 times and the cost was saved by one third. When the foundation pit area is 100 m×100 m， carbon dioxide emission is reduced by 22.7 t. In the comparison of cooling effect， the cooling effect of the energy exchange system with ice is not different from that of the air conditioning system， but the electricity consumption is only 1/6 of that of the air conditioning system. The results can provide technical reference for similar projects in the future.

Keywords：Foundation pit support; geothermal exchange; sponge city; large diameter pipe pile

0 引言

为充分利用环境设施、节约资源和能量，综合考虑基坑支护系统、地温交换系统和雨水调蓄系统，利用上述3个系统形成大直径基坑支护能量蓄水管桩新技术。

众所周知，基坑支护结构一般是在坑底下有一定插入深度的桩、板和墙结构，常用材料为混凝土、钢筋混凝土及钢材等，可以是钢板桩、柱列式灌注桩、水泥土搅拌桩和地下连续墙等[1-2]。……