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Collapsible foundation immersed tube pile forming treatment method
The invention belongs to the technical field of foundation treatment construction, and relates to a collapsible foundation immersed tube pile forming treatment method. When a collapsible loess foundation is treated through immersed tube compaction piles, when shrinkage cavities occur after immersed tubes are pulled out, a long spiral drilling machine is adopted for conducting rotary excavating on retracted soil in holes for secondary soil discharging, and the beneficial effects of being good in hole forming effect and high in construction work efficiency are achieved. Meanwhile, due to secondary soil discharging after shrinkage cavity treatment, the compaction degree of soil between the piles is reduced, foundation soil is wet and soft and large in water content, and in order to make up for the compaction effect of the soil between the piles and improve the water content of the foundation soil, a filler ramming scheme of the next procedure is adjusted into a pile forming construction method including lime soil backfilling, heavy hammer ramming, layered filler filling and layered ramming. Due to the fact that lime is used for filler adding, the cost of the pile forming method is properly increased compared with a plain soil backfilling ramming pile forming scheme, the construction efficiency of the pile forming method is the same as that of the plain soil backfilling ramming pile forming scheme, and meanwhile the beneficial effects of being good in pile forming effect and effectively improving the foundation soil property are achieved. Compared with the scheme I, the scheme II and the scheme III in the prior art in the third part of the invention, the secondary hole forming and pile forming scheme has the beneficial effects of being economical, efficient, safe, environment-friendly and applicable.
本发明专利属于基础设地基处理施技术领域，涉及一种湿陷性地基沉管成桩处理方法。本发明是在沉管挤密桩处理湿陷性黄土地基时沉管完成拔管后出现缩孔时，再采用长螺旋钻机对孔内回缩土进行旋挖二次出土，具有成孔效果好、施工工效高的特点。同时因缩孔后的二次出土降低了桩间土的挤密程度，且地基土湿软、含水率较大，为弥补桩间土的挤密效果，同时改善地基土的含水率，对下道工序的填料夯击方案调整为回填灰土、重锤夯击、分层填料、分层夯击的成桩施工方法，因填料增加使用了石灰，此成桩方法较回填素土夯击成桩方案适当增加了成本，但其施工效率相同，同时具有成桩效果好、有效改善地基土性质的优点。上述二次成孔、成桩方案相较本文第3部分现有技术的方案一、二、三均具有经济、高效、安全、环保、适用的特点。
Collapsible foundation immersed tube pile forming treatment method
The invention belongs to the technical field of foundation treatment construction, and relates to a collapsible foundation immersed tube pile forming treatment method. When a collapsible loess foundation is treated through immersed tube compaction piles, when shrinkage cavities occur after immersed tubes are pulled out, a long spiral drilling machine is adopted for conducting rotary excavating on retracted soil in holes for secondary soil discharging, and the beneficial effects of being good in hole forming effect and high in construction work efficiency are achieved. Meanwhile, due to secondary soil discharging after shrinkage cavity treatment, the compaction degree of soil between the piles is reduced, foundation soil is wet and soft and large in water content, and in order to make up for the compaction effect of the soil between the piles and improve the water content of the foundation soil, a filler ramming scheme of the next procedure is adjusted into a pile forming construction method including lime soil backfilling, heavy hammer ramming, layered filler filling and layered ramming. Due to the fact that lime is used for filler adding, the cost of the pile forming method is properly increased compared with a plain soil backfilling ramming pile forming scheme, the construction efficiency of the pile forming method is the same as that of the plain soil backfilling ramming pile forming scheme, and meanwhile the beneficial effects of being good in pile forming effect and effectively improving the foundation soil property are achieved. Compared with the scheme I, the scheme II and the scheme III in the prior art in the third part of the invention, the secondary hole forming and pile forming scheme has the beneficial effects of being economical, efficient, safe, environment-friendly and applicable.
本发明专利属于基础设地基处理施技术领域，涉及一种湿陷性地基沉管成桩处理方法。本发明是在沉管挤密桩处理湿陷性黄土地基时沉管完成拔管后出现缩孔时，再采用长螺旋钻机对孔内回缩土进行旋挖二次出土，具有成孔效果好、施工工效高的特点。同时因缩孔后的二次出土降低了桩间土的挤密程度，且地基土湿软、含水率较大，为弥补桩间土的挤密效果，同时改善地基土的含水率，对下道工序的填料夯击方案调整为回填灰土、重锤夯击、分层填料、分层夯击的成桩施工方法，因填料增加使用了石灰，此成桩方法较回填素土夯击成桩方案适当增加了成本，但其施工效率相同，同时具有成桩效果好、有效改善地基土性质的优点。上述二次成孔、成桩方案相较本文第3部分现有技术的方案一、二、三均具有经济、高效、安全、环保、适用的特点。
Collapsible foundation immersed tube pile forming treatment method
一种湿陷性地基沉管成桩处理方法
ZHANG YUBO (author) / WEI SANMING (author) / LI YUAN (author)
2021-06-25
Patent
Electronic Resource
Chinese
IPC:
E02D
FOUNDATIONS
,
Gründungen
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