Back-insert steel reinforcement cage cement-flyash-gravel pile and pile-forming method thereof

Abstract

The invention discloses a back-insert steel reinforcement cage cement-flyash-gravel pile. The back-insert steel reinforcement cage cement-flyash-gravel pile comprises a cement-flyash-gravel mixture filled layer, and is characterized by comprising a cage-shaped framework which is mainly formed by fixedly connecting a plurality of main bars with hoopings, and the cement-flyash-gravel mixture filled layer is densely filled in the cage-shaped framework, extends and is covered on the periphery of the cage-shaped framework. According to the back-insert steel reinforcement cage cement-flyash-gravel pile disclosed by the invention, the cage-shaped framework is arranged in the cement-flyash-gravel mixture filled layer, so that the back-insert steel reinforcement cage cement-flyash-gravel pile disclosed by the invention can be used for reinforcement treatment of high-speed railway foundations, such as slope foundations, semi-filled and semi-excavated foundations, mucky soil layers and the like, which are easy to produce greater horizontal force and very strict to control sedimentation after working, greatly enhance the horizontal shearing strength of the cement-flyash-gravel pile composite foundations and ensure that the sedimentation and the stability of the high-speed railway foundations can meet the requirements. In addition, the back-insert steel reinforcement cage cement-flyash-gravel pile disclosed by the invention has obvious social effects and economic benefits. Compared with a small drilled pile (the diameter is 60cm), the cost of the back-insert steel reinforcement cage cement-flyash-gravel pile can be saved by nearly 1 / 3 under the same conditions.

Description

technical field [0001] The invention relates to the technical field of foundation reinforcement for railways, highways, water conservancy and civil buildings, in particular to a post-inserted steel cage cement fly ash macadam pile and a method for forming the pile. technical background [0002] High-speed railway subgrade engineering has high requirements for settlement, especially uneven settlement. For weak foundations such as slope foundations, half-filled and half-dug foundations, silt, and muddy soils, bored piles, pipe piles, etc. are used because they are prone to generate large horizontal forces. Processing technology, processing cost is high. Cement fly ash gravel piles, as a conventional composite foundation treatment method, are widely used in railway engineering because of their simple construction, easy quality control, and low cost. Quality problems often occur when the foundation is weak such as soil. Contents of the invention [0003] The purpose of the p...

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Problems solved by technology

[0002] High-speed railway subgrade engineering has high requirements for settlement, especially uneven settlement. For weak foundations such as slope foundations, half-filled and half-dug foundations, silt, and muddy soils, bored piles, pipe piles, etc. are used because they are prone to generate large horizontal forces. Processing technology, high processing cost

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