Construction method of composite foundation

Abstract

The invention aims to provide a construction method of composite foundation, pile-body material and earth body around the pile can be fully transferred to bear force through the method, and the intensity around the pile body can be kept uniform through regulating construction parameters, thereby ensuring the bearing capacity of foundation and effectively solving the problem of uneven deposition. The construction method comprises the following steps: (1) inserting an inner tamping tube the upper end of which is provided with a diesel hammer into an outer tube with a larger diameter; (2) simultaneously submerging the outer hammer and the inner tamping tube down to the design depth through the up and down work of the diesel hammer; (3) raising the inner tamping tube, and then filling stuffing to the inside of the outer tube, and then tamping the stuffing by the inner tamping tube and gradually tamping the stuffing out of the outer tube; (4) taking the set penetration of the diesel hammer as a hammer stopping standard to control the intensity of reinforcement and compaction; (5) lifting the outer tube to a certain height through an outer connection device of the outer tube and simultaneously lifting the inner tamping tube; and (6) repeating the operations in steps (3)-(5) until reaching ground level.

Description

technical field

[0001] The invention relates to the field of civil engineering, in particular to foundation reinforcement treatment. Background technique

[0002] In the foundation reinforcement treatment of buildings, such geological conditions are often encountered: the building is located on the newly filled soil layer or the weak undisturbed soil layer (hereinafter referred to as the weak soil layer), and the bearing capacity of the weak soil layer is low, which cannot meet the requirements. The requirements of the upper load and deformation, but there is undisturbed soil that meets the strength and deformation requirements of the upper load at a certain depth under the soft soil layer, and in most cases, the depth of the filling layer is different due to geological changes. Under this geological condition, the commonly used composite foundation treatment methods, such as dynamic compaction method, deep mixing method, CFG pile, compaction pile, etc., although the bearing...

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