Complex geological karst hole pile foundation construction process
A technology for foundation construction and complex geology, applied in foundation structure engineering, sheet pile walls, buildings, etc., can solve the problems of unguaranteed construction safety, increased construction cost, loss of mud and wall instability, etc. The effect of increasing the porosity, increasing the controllability of the construction period and reducing the construction cost
Pending Publication Date: 2021-09-28
CHINA RAILWAY NO 8 ENG GRP CO LTD
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The most prominent problem in bridge construction under karst geological conditions is the construction of pile foundations. Under normal conditions, rotary drilling rigs or percussion drilling are used to form holes in the retaining wall of pile foundations, and concrete is poured underwater to form piles. However, due to karst geological conditions The karst caves are developed, and the hole pile foundation basically has to pass through the karst caves with complex geological karst to form the karst cave pile foundation. The above method is used for the construction of the karst cave pile foundation, which is very prone to mud loss and instability of the retaining wall, so that the construction safety cannot be guaranteed. The construction period is seriously delayed, and the construction cost investment is greatly increased
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[0084] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0085] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying...
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The invention discloses a complex geological karst hole pile foundation construction process. The complex geological karst hole pile foundation construction process comprises the steps that a concrete backfilling karst cave pile foundation construction method or a double-steel-casing all-casing follow-up pile foundation construction method is adopted to perform hole pile foundation construction; when the karst cave where the karst cave pile foundation is located is a small karst cave, hole pile foundation construction is carried out through a concrete backfilling karst cave pile foundation construction method; and when the karst cave where the karst cave pile foundation is located is a large karst cave or a communicating type bead string karst cave group, hole pile foundation construction is carried out through the double-steel-casing all-casing follow-up pile foundation construction method. The conditions of mud loss, wall protection instability and the like of a traditional construction method can be effectively avoided, the construction safety can be effectively guaranteed, the construction period is guaranteed, and meanwhile, the construction cost can be reduced.
Description
technical field [0001] The invention belongs to the technical field of bridge hole pile foundation construction, and in particular relates to a construction technology of complex geological karst hole pile foundations. Background technique [0002] In the area covered by karst landforms, the complexity and diversity of geological factors have greatly affected the progress and investment of engineering construction. The most prominent problem in bridge construction under karst geological conditions is the construction of pile foundations. Under normal conditions, rotary drilling rigs or percussion drilling are used to form holes in the retaining wall of pile foundations, and concrete is poured underwater to form piles. However, due to karst geological conditions The karst caves are developed, and the hole pile foundation basically has to pass through the karst caves with complex geological karst to form the karst cave pile foundation. The above method is used for the construc...
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IPC IPC(8): E02D5/38E02D27/12
CPCE02D5/38E02D27/12
Inventor 刘佳银王智勇赵志彭建伟汤建和王杰邓存俊田波席利萍龚斯昆赵代强
Owner CHINA RAILWAY NO 8 ENG GRP CO LTD
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