Construction method for non-prestressed centrifugal high-strength concrete pile planted pile

Abstract

The invention provides a non-prestressed centrifugal high-strength concrete pile planted pile structure and a construction method thereof. The method comprises the construction steps that a pile planting machine is in place, the hole guiding operation is conducted, a bearing stratum is determined, base expansion is carried out, pile end cement paste is injected, pile periphery cement paste is injected and drill stems are pulled out, pile connection of pre-drilled holes is conducted, and non-prestressed centrifugal high-strength concrete piles are planted into pile holes. The pile planting construction method has the effects that damage to pile bodies is effectively reduced; the ductility of the pile bodies is improved more than 30%; the pile body cracking phenomenon is avoided; the whole performances of the pipe piles are improved more than 20%; the technique is simple, the cost is low and the cost performance is high; the centrifugal concrete piles which are high in vertical bearing capacity and horizontal pile foundation bearing capacity and capable of meeting the anti-seismic requirement can penetrate through a hard middle layer and a thick solidified layer and can be widely applied to foundation construction of various soil textures; it is ensured that the requirement of housing industrialization for quality is met; the pile planting construction method has good social benefits and popularization value.

Description

technical field [0001] The invention relates to a pile structure and a construction method thereof, in particular to a non-prestressed centrifugal high-strength concrete pile construction method. Background technique [0002] With the rapid development of urban construction, the land resources available for construction are becoming less and less, so housing construction is developing towards high-rise buildings, and various high-rise and super high-rise buildings have become the current construction dominance. For the foundation engineering of high-rise and ultra-high-rise buildings, the requirements for foundation bearing capacity are getting higher and higher, and the requirements for building settlement deformation are also getting higher and higher. In order to meet the bearing capacity and deformation requirements, deep and long pile foundations are often used in the design. [0003] Although the existing prefabricated piles are widely used in construction, there are ...

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Problems solved by technology

[0003] Although the existing prefabricated piles are widely used in construction, there are still many disadvantages: for example: in soft soil foundation, the resistance around the pile is not fully exerted; the strength of the pile body cannot be fully exerted under the vertical compressive load in soft soil foundation; When the construction is improper, the pile body is prone to tilt, causing damage to the pile body; when the welding construction is improper and the pile head structure is not handled properly, the pull-out bearing capacity cannot meet the requirements; the deformation performance is not high enough, and it is easy to be brittle and damaged.

[0004] Existing prefabricated piles are generally dominated by hammering pile sinking and static pressure pile sinking, and there is often soil extrusion, which affects surrounding facilities (underground structures, pipelines) during construction; construction consumes high energy, generates noise and air Pollution; it is difficult to penetrate various interlayers; improper construction can easily cause macro or micro damage to the pile body; the elevation of the pile top is difficult to control

In addition, the existing cast-in-situ piles also have the following problems: neck shrinkage, mud discharge has become a social problem; sediment at the bottom of the pile occurs from time to time, and the quality of the pile body fluctuates greatly and is not stable enough; It is very difficult; the site is difficult to keep clean; the construction speed is slow and the efficiency is low; the converted bearing capacity of unilateral concrete is only 30% to 40% of PHC piles, and the limited resources are not fully utilized, etc.

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