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Underwater double-pile-casing cast-in-place pile construction method suitable for seabed with hard rock stratum
The invention discloses a construction method of an underwater double-casing cast-in-place pile suitable for a seabed with a hard rock stratum, which belongs to the technical field of cast-in-place piles, and comprises the following steps: S1, hoisting an outer casing, drilling an outer casing hole for the outer casing to naturally sink to the hard rock stratum by adopting a punching pile driver, reaming the outer casing hole, and drilling the outer casing hole to form an outer casing hole for the outer casing to naturally sink to the hard rock stratum; the outer pile casing is supported and plugged in the reamed hole; s2, the inner pile casing is hoisted into the outer pile casing, an inner pile casing hole with the depth being 0.5-1 m is drilled through a punching pile driver, and the inner pile casing is supported and plugged; s3, an anchor rod hole is drilled through a down-the-hole drill, and an anchor rod is put down; and S4, concrete mortar is poured into the inner pile casing, after the concrete mortar reaches the preset strength, the support between the inner pile casing and the outer pile casing is withdrawn, and the concrete mortar is poured into the space between the inner pile casing and the outer pile casing. While undercut and hammer explosion of a pile hammer of the punching pile driver are avoided, the bearing capacity and stability of a pile foundation are ensured through the anchor rods, the construction progress is accelerated, and the hole forming cost is greatly reduced.
本发明公开了一种适用于具有硬岩层海床的水下双护筒灌注桩施工方法，属于灌注桩技术领域，包括以下步骤：S1、吊放外护筒，采用冲孔打桩机钻设出供外护筒自然下沉至硬岩层上的外护筒孔，对外护筒孔进行扩孔，在扩孔内对外护筒进行支护和封堵；S2、将内护筒吊放至外护筒内，采用冲孔打桩机钻设出深度为0.5m~1m的内护筒孔，对内护筒进行支护和封堵；S3、采用潜孔钻钻设出锚杆孔并下放锚杆；S4、向内护筒内灌注混凝土砂浆，待混凝土砂浆达到预设强度后，撤出内护筒和外护筒之间的支护，向内护筒和外护筒之间灌入混凝土砂浆。避免对冲孔打桩机的桩锤造成“咬边”和“爆锤”的同时，利用锚杆确保桩基的承载能力及稳定性，加快施工进度，大大减少了成孔成本。
Underwater double-pile-casing cast-in-place pile construction method suitable for seabed with hard rock stratum
The invention discloses a construction method of an underwater double-casing cast-in-place pile suitable for a seabed with a hard rock stratum, which belongs to the technical field of cast-in-place piles, and comprises the following steps: S1, hoisting an outer casing, drilling an outer casing hole for the outer casing to naturally sink to the hard rock stratum by adopting a punching pile driver, reaming the outer casing hole, and drilling the outer casing hole to form an outer casing hole for the outer casing to naturally sink to the hard rock stratum; the outer pile casing is supported and plugged in the reamed hole; s2, the inner pile casing is hoisted into the outer pile casing, an inner pile casing hole with the depth being 0.5-1 m is drilled through a punching pile driver, and the inner pile casing is supported and plugged; s3, an anchor rod hole is drilled through a down-the-hole drill, and an anchor rod is put down; and S4, concrete mortar is poured into the inner pile casing, after the concrete mortar reaches the preset strength, the support between the inner pile casing and the outer pile casing is withdrawn, and the concrete mortar is poured into the space between the inner pile casing and the outer pile casing. While undercut and hammer explosion of a pile hammer of the punching pile driver are avoided, the bearing capacity and stability of a pile foundation are ensured through the anchor rods, the construction progress is accelerated, and the hole forming cost is greatly reduced.
本发明公开了一种适用于具有硬岩层海床的水下双护筒灌注桩施工方法，属于灌注桩技术领域，包括以下步骤：S1、吊放外护筒，采用冲孔打桩机钻设出供外护筒自然下沉至硬岩层上的外护筒孔，对外护筒孔进行扩孔，在扩孔内对外护筒进行支护和封堵；S2、将内护筒吊放至外护筒内，采用冲孔打桩机钻设出深度为0.5m~1m的内护筒孔，对内护筒进行支护和封堵；S3、采用潜孔钻钻设出锚杆孔并下放锚杆；S4、向内护筒内灌注混凝土砂浆，待混凝土砂浆达到预设强度后，撤出内护筒和外护筒之间的支护，向内护筒和外护筒之间灌入混凝土砂浆。避免对冲孔打桩机的桩锤造成“咬边”和“爆锤”的同时，利用锚杆确保桩基的承载能力及稳定性，加快施工进度，大大减少了成孔成本。
Underwater double-pile-casing cast-in-place pile construction method suitable for seabed with hard rock stratum
一种适用于具有硬岩层海床的水下双护筒灌注桩施工方法
GU BOFU (author) / CHANG XU (author) / PENG JIACHENG (author) / ZOU PINGPING (author) / HUANG YINGBIN (author)
2023-09-08
Patent
Electronic Resource
Chinese
IPC:
E02D
FOUNDATIONS
,
Gründungen
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