Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Construction method for jet grouting pile forming in gravel-cobble stratum
The invention discloses a construction method for jet grouting pile forming in a gravel-cobble stratum. The construction method comprises the following steps that a down-the-hole hammer leads a hole,and a steel casing follows up; a down-the-hole hammer drilling process is used for drilling, during drilling, peripheral pebbles are loosened under the impact action of a hammer head, and the whole length of the steel casing follows up; the loose pebble ring body is isolated outside a drill hole by the steel casing, so that the drill hole is prevented from collapsing; a drill bit is pulled out, and a steel branch pipe is lowered; the steel casing is lifted; the steel branch pipe replaces the steel casing to support the hole wall; the high-pressure jet grouting drill rod is lowered to the bottom of the hole, the steel branch pipe is lifted, and a jet grouting drill rod nozzle is in direct contact with the hole wall; high-pressure cement paste is sprayed out by the jet grouting drill rod, the collapsed pebbles are cut and disturbed by the high-pressure cement paste, the steel branch pipe and the jet grouting drill rod are synchronously lifted until the steel branch pipe and the jet grouting drill rod are lifted to the designed height, and a large-diameter pile body is formed after cement paste is solidified; By means of the method, the large-diameter high-perpendicularity jet grouting pile can be formed in the gravel-cobble stratum.
本申请公开了一种卵碎石地层中旋喷成桩的施工方法，包括以下步骤：潜孔锤引孔、钢护筒跟进；用潜孔锤钻孔工艺进行钻孔，钻孔时，锤头冲击作用将周边卵石松动，钢护筒全长跟进；钢护筒将松散卵石圈体隔离在钻孔外，防止钻孔坍塌；拔出钻头、下放钢支管；提升钢护筒；钢支管代替钢护筒对孔壁进行支撑；下放高压旋喷钻杆至孔底，提升钢支管，旋喷钻杆喷嘴与孔壁直接接触；旋喷钻杆喷出高压水泥浆，高压水泥浆对坍塌后的卵石进行切割扰动，同步提升钢支管与旋喷钻杆，直至提升至设计高度，水泥浆液凝固后，形成大直径桩体。本发明能够在卵碎石地层中形成大直径高垂直度的旋喷桩。
Construction method for jet grouting pile forming in gravel-cobble stratum
The invention discloses a construction method for jet grouting pile forming in a gravel-cobble stratum. The construction method comprises the following steps that a down-the-hole hammer leads a hole,and a steel casing follows up; a down-the-hole hammer drilling process is used for drilling, during drilling, peripheral pebbles are loosened under the impact action of a hammer head, and the whole length of the steel casing follows up; the loose pebble ring body is isolated outside a drill hole by the steel casing, so that the drill hole is prevented from collapsing; a drill bit is pulled out, and a steel branch pipe is lowered; the steel casing is lifted; the steel branch pipe replaces the steel casing to support the hole wall; the high-pressure jet grouting drill rod is lowered to the bottom of the hole, the steel branch pipe is lifted, and a jet grouting drill rod nozzle is in direct contact with the hole wall; high-pressure cement paste is sprayed out by the jet grouting drill rod, the collapsed pebbles are cut and disturbed by the high-pressure cement paste, the steel branch pipe and the jet grouting drill rod are synchronously lifted until the steel branch pipe and the jet grouting drill rod are lifted to the designed height, and a large-diameter pile body is formed after cement paste is solidified; By means of the method, the large-diameter high-perpendicularity jet grouting pile can be formed in the gravel-cobble stratum.
本申请公开了一种卵碎石地层中旋喷成桩的施工方法，包括以下步骤：潜孔锤引孔、钢护筒跟进；用潜孔锤钻孔工艺进行钻孔，钻孔时，锤头冲击作用将周边卵石松动，钢护筒全长跟进；钢护筒将松散卵石圈体隔离在钻孔外，防止钻孔坍塌；拔出钻头、下放钢支管；提升钢护筒；钢支管代替钢护筒对孔壁进行支撑；下放高压旋喷钻杆至孔底，提升钢支管，旋喷钻杆喷嘴与孔壁直接接触；旋喷钻杆喷出高压水泥浆，高压水泥浆对坍塌后的卵石进行切割扰动，同步提升钢支管与旋喷钻杆，直至提升至设计高度，水泥浆液凝固后，形成大直径桩体。本发明能够在卵碎石地层中形成大直径高垂直度的旋喷桩。
Construction method for jet grouting pile forming in gravel-cobble stratum
卵碎石地层中旋喷成桩的施工方法
ZHANG BINGFENG (Autor:in) / ZHU LAILEI (Autor:in) / WANG PENGFEI (Autor:in)
29.01.2021
Patent
Elektronische Ressource
Chinesisch
IPC:
E02D
FOUNDATIONS
,
Gründungen
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