Composite type combined piles and construction method thereof

Abstract

The invention provides composite type combined piles. The composite type combination piles comprise a combination of a plurality of rectangular piles, a plurality of non-prestressed piles, a plurality of bamboo joint type piles and a plurality of prestressed pipe piles. The composite type combined piles of different pile types are combined, and every two vertical piles of the composite type combined piles of each pile type are connected in a mechanical connection method. Meanwhile, the invention provides a construction method of the composite type combined piles. The composite type combined piles have the advantages that compression bearing capacity of a single pile is high, strength of pile body concrete is brought into full play, extraction resistant performance of a pile body can be greatly improved, compression bearing capacity of the pile body is greatly improved, construction has no influence on peripheral facilities, noise and air pollution are avoided, the piles are suitable for the geological condition that a pile tip bearing stratum greatly changes, particularly, the connector part of the pile body is protected by cement inside and outside the pile body, and the pile body integration is more reliable. A pile connection method is fast, safe and stable, the bearing force of a single pile is high, and the composite type combined piles have good social benefits and popularization value.

Description

technical field [0001] The invention relates to a pile and its construction process, in particular to a composite composite pile and its 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 diameter cast-in-situ pile foundations are often used in the design. [0003] Although the existing prefabricated piles are widely used in construction, there are still many disad...

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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 may cause macroscopic or microscopic damage to the pile body; the elevation of the pile top is difficult to control, and improper pile cutting may easily cause damage to the pile head or changes in the prestress of the pile body; Restrictions, can not meet the high-rise or super high-rise bearing capacity requirements and other issues

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; it is difficult to keep the site tidy; 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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