Combined pile type structure and construction method for treating insufficient bearing capacity of deep foundation pit construction pile by adopting combined pile type structure

Abstract

The invention provides a combined pile type structure and a construction method for treating insufficient bearing capacity of a deep foundation pit construction pile by adopting the combined pile type structure, and relates to the technical field of buildings. The technical problem in the prior art that the effect of treating the insufficient bearing capacity of the deep foundation pit construction pile by adopting an existing method is poor is solved. The combined pile type structure comprises a steel pipe pile, grouting pipes and steel pipe sleeves, and the grouting pipes are connected to the two sides of the steel pipe pile; and the bottom sections of the grouting pipes are arranged into pressure drop nozzles, the pressure drop nozzles are sleeved with the steel pipe sleeves, the bottoms of the steel pipe sleeves are blocked, and accommodating cavities are formed between the steel pipe sleeves and the pressure drop nozzles. The steel pipe pile is directly sleeved and driven in situ, the position and the size of a bearing platform do not need to be changed, the periphery of the steel pipe pile is grouted through the grouting pipes, a soil body is reinforced, the integrity of the soil body is enhanced, the bearing capacity of the steel pipe pile is effectively guaranteed, and compared with an existing construction scheme, operation is convenient and fast, social and economic effects are remarkable, the requirements for efficient, energy-saving and green construction are met, and meanwhile, the construction cost is saved.

Description

technical field [0001] The invention relates to the technical field of construction, in particular to a combined pile structure and a construction method for dealing with insufficient bearing capacity of deep foundation pit construction piles by using the combined pile structure. Background technique [0002] At present, the traditional ways to deal with insufficient bearing capacity of PHC pipe piles in deep foundation pits and water and sand emission include: (1) backfilling the foundation pit for re-piling; (2) constructing bored piles at the base. Although the first method can solve the problem of insufficient bearing capacity of PHC due to water and sand emission, due to the influence of the original PHC pipe piles, the placement of the supplementary piles is not easy, and the caps need to be changed accordingly. Large-scale pile driving equipment cannot normally enter the excavated deep foundation pit, and the entry and exit costs of large-scale equipment are high. Du...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a combined pile type structure and a construction method using the combined pile type structure to deal with insufficient bearing capacity of deep foundation pit construction piles, so as to solve the problems existing in the prior art by using existing methods to deal with deep foundation pit construction The technical problem that pile bearing capacity is insufficient and effect is relatively poor; Many technical effects that the optimal technical scheme in many technical schemes provided by the present invention can produce (the grouting pipe bottom section is provided with a plurality of overflowing grouting holes, is used for grouting; The grout overflow hole is set in a plum blossom shape to improve the success rate of grouting. At the same time, when the construction pile is a PHC pipe pile, the foundation cavity caused by water and sand emission is dealt with, which lays a foundation for ensuring the bearing capacity of the steel pipe pile; the grout overflow hole is set There is a one-way valve to limit the flow direction of the slurry and avoid backflow; the pressure drop nozzle and the steel pipe sleeve form a housing chamber, and the interior is filled with foam, which effectively prevents the soil from blocking the pressure drop nozzle during the sinking process, and the other On the one hand, when grouting, the grouting pipe can squeeze out the styrofoam under pressure without affecting the grouting effect; the bottom of the steel pipe sleeve is provided with a steel plate plug, and the bottom of the steel plate plug is provided with a ribbed plate, which helps the grouting pipe to follow the steel pipe pile. sink into the soil; the lower sections of the two grouting pipes are respectively located on the outside and inside of the steel pipe pile, which can simultaneously reinforce the inner and outer soil of the steel pipe pile, increase the integrity of the soil, and improve the distance between the soil and the steel pipe pile. Frictional resistance; the grouting pipe is provided with a control valve for controlling grout injection, etc.); see below for details

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