Construction method of composite foundation

Abstract

The object of the present invention is to provide a construction method of composite foundation, through which the material of the pile body and the soil around the pile can be fully mobilized to participate in the stress, and the compactness around the pile body can be kept uniform by adjusting the construction parameters, and the foundation can be improved. bearing capacity and effectively solve uneven settlement. The construction method includes the following steps: ①Insert the inner ramming pipe with a diesel hammer on the upper end into the large-diameter outer pipe; ②The outer pipe and the inner ramming pipe sink to the design depth at the same time through the up and down work of the diesel hammer; ③Propose Internally ramming the pipe, filling the inside of the outer pipe with filler, and then making the inner ramming pipe ram the filler and gradually knock out the outer pipe; ④ Take the penetration of the diesel hammer as the hammer closing standard to control the reinforcement and compaction ⑤Through the external connection device of the outer pipe, lift the outer pipe to a certain height, and at the same time raise the inner ramming pipe; ⑥Repeat the above steps ③ to ⑤ until the ground level is reached.

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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Problems solved by technology

However, there is no precedent for the reinforcement of composite foundation with diesel hammer equipment.

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