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A platform for research: civil engineering, architecture and urbanism
Anchor hole reaming construction method capable of preventing hole collapse
The invention relates to an anchor hole reaming construction method capable of preventing hole collapse, and belongs to the technical field of anchoring. The free section adopts a common drill bit to carry out pipe-following construction and screw-in, the common drill bit is withdrawn when the free section reaches the joint position of the free section and the anchoring section, a rotary spraying drill bit is arranged below the free section, high-pressure cement paste is injected from a rotary spraying drill rod to the rotary spraying drill bit, the high-pressure cement paste is sprayed out from a drill bit guniting opening to cut the soil body of the anchoring section, the drill bit is rotated while the high-pressure cement paste is sprayed, and drilling is not carried out temporarily; drilling is conducted till the expanded part is gradually filled with cement grout in the expanded hole, drilling is strictly prohibited before the expanded part is filled with the grout, and drilling is started to be conducted into the hole when the returned cement grout is stable; the rotary jet grouting drill bit is adopted, the hole diameter of the anchoring section can be freely set, the hole diameter can be adjusted according to the grout spraying pressure, due to the fact that the hole diameter is enlarged, larger bearing capacity can be obtained, the expanded part of the section is filled with cement paste, the tension of the cement paste effectively protects the hole wall and prevents the hole wall from collapsing, meanwhile, subsidence of the ground on the outer side of a foundation pit can be avoided, and safety is high.
本发明涉及一种防止塌孔的锚孔扩孔施工方法，属于锚固技术领域；自由段采用普通钻头跟管施工旋进，到自由段与锚固段交接位置，退出普通钻头，下置入旋喷钻头，从旋喷钻杆内注入高压水泥浆至旋喷钻头，高压水泥浆从钻头喷浆口喷出切割锚固段土体，边喷射高压水泥浆液，边旋转钻头，但暂不钻进，直至扩大孔内水泥浆液逐渐充满扩大部分，并在浆液充满前，严禁钻进，待返出水泥浆液稳定，开始向孔内钻进；本发明通过采用旋喷钻头，锚固段可设置孔径较为自由，孔径可根据喷浆压力调整，由于孔径的扩大可得到更大的承载力，段扩大部分内充满水泥浆，水泥浆张力有效护住孔壁，防止孔壁坍塌，同时能够避免基坑外侧地面沉降，安全性较高。
Anchor hole reaming construction method capable of preventing hole collapse
The invention relates to an anchor hole reaming construction method capable of preventing hole collapse, and belongs to the technical field of anchoring. The free section adopts a common drill bit to carry out pipe-following construction and screw-in, the common drill bit is withdrawn when the free section reaches the joint position of the free section and the anchoring section, a rotary spraying drill bit is arranged below the free section, high-pressure cement paste is injected from a rotary spraying drill rod to the rotary spraying drill bit, the high-pressure cement paste is sprayed out from a drill bit guniting opening to cut the soil body of the anchoring section, the drill bit is rotated while the high-pressure cement paste is sprayed, and drilling is not carried out temporarily; drilling is conducted till the expanded part is gradually filled with cement grout in the expanded hole, drilling is strictly prohibited before the expanded part is filled with the grout, and drilling is started to be conducted into the hole when the returned cement grout is stable; the rotary jet grouting drill bit is adopted, the hole diameter of the anchoring section can be freely set, the hole diameter can be adjusted according to the grout spraying pressure, due to the fact that the hole diameter is enlarged, larger bearing capacity can be obtained, the expanded part of the section is filled with cement paste, the tension of the cement paste effectively protects the hole wall and prevents the hole wall from collapsing, meanwhile, subsidence of the ground on the outer side of a foundation pit can be avoided, and safety is high.
本发明涉及一种防止塌孔的锚孔扩孔施工方法，属于锚固技术领域；自由段采用普通钻头跟管施工旋进，到自由段与锚固段交接位置，退出普通钻头，下置入旋喷钻头，从旋喷钻杆内注入高压水泥浆至旋喷钻头，高压水泥浆从钻头喷浆口喷出切割锚固段土体，边喷射高压水泥浆液，边旋转钻头，但暂不钻进，直至扩大孔内水泥浆液逐渐充满扩大部分，并在浆液充满前，严禁钻进，待返出水泥浆液稳定，开始向孔内钻进；本发明通过采用旋喷钻头，锚固段可设置孔径较为自由，孔径可根据喷浆压力调整，由于孔径的扩大可得到更大的承载力，段扩大部分内充满水泥浆，水泥浆张力有效护住孔壁，防止孔壁坍塌，同时能够避免基坑外侧地面沉降，安全性较高。
Anchor hole reaming construction method capable of preventing hole collapse
一种防止塌孔的锚孔扩孔施工方法
SUN HAO (author) / LI SIQUAN (author) / SUN YANAN (author) / CHENG YUNMAO (author) / XU BINGJIE (author) / GU XIANG (author) / YAN GUANYU (author) / QIN YINGFENG (author) / ZHENG YI (author) / AI ZEHONG (author)
2023-06-27
Patent
Electronic Resource
Chinese
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