Micro steel pipe pile-sinking pipe sand gravel pile combined foundation reinforcement construction method and structure

Abstract

The invention discloses a micro steel pipe pile-sinking pipe sand gravel pile combined foundation reinforcement construction method and structure. The combined foundation reinforcement structure comprises a plurality of reinforcement holes. Each of the reinforcement holes is internally provided with a micro steel pipe, and the micro steel pipes and the reinforcement holes are coaxially arranged. Annular sand gravel piles are arranged between the inner walls of the reinforcement holes and the outer walls of the micro steel pipes. A plurality of mortar outlet holes are formed in the pipe wall ofeach micro steel pipe. After cement mortar is injected into the micro steel pipes through grouting pipes, the cement mortar can penetrate into gaps of the annular sand gravel piles through the mortaroutlet holes. The micro steel pipes and the cement mortar therein solidify to form steel pipe piles, and the sand gravel piles outside the micro steel pipes are solidified into cement sand gravel piles through the cement mortar penetrating into the sand gravel gaps. The cement sand gravel piles and the steel pipe piles wrapped with the cement sand gravel piles jointly form combined reinforcementpiles. It can be seen that a combined reinforcement body of rigid piles and flexible piles can be formed, foundation soil can be compacted so that the characters of the foundation soil are significantly improved, the bearing capacity of the reinforcement body can be significantly improved, and the reinforcement effect is enhanced.

Description

technical field [0001] The invention relates to a foundation treatment technology and a construction method thereof, in particular to a construction method and a structure of a micro-steel pipe pile-sinking sandstone pile combined foundation reinforcement. Background technique [0002] For foundations such as loose sandy soil, miscellaneous fill, and plain fill, the soil is loose and cannot be directly used for engineering construction, and appropriate methods must be used for foundation treatment. The idea of ​​this type of foundation treatment is to increase the compactness of the foundation soil, thereby increasing the bearing capacity and reducing the settlement. Commonly used treatment methods include rolling, dynamic compaction, and compaction methods (such as gravel piles and gravel piles, etc.), among which, the treatment depth of the rolling method is relatively shallow, and the dynamic compaction method is limited by the site environment. The equal compaction meth...

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Problems solved by technology

However, since the sand and gravel piles formed by the compaction method are non-bonded strength piles, their bearing capacity is relatively low compared with bonded strength piles, especially rigid piles, and the upper load that can be shared is limited. The bearing capacity of the foundation is relatively low, and the treatment depth is also limited, which sometimes cannot meet the engineering requirements

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