A kind of frp combined micropile and manufacturing method

Abstract

The invention discloses an FRP composite micro pile and a manufacturing method and relates to the technical field of engineering pile foundations. The FRP composite micro pile comprises an FRP pipe, an FRP rib and a concrete foundation; a through hole is formed in the FRP pipe; the FRP rib is arranged in the through hole and penetrates the FRP pipe; the FRP rib is connected with the FRP pipe through a positioning ring; the top end of the FRP pipe is connected with the concrete foundation; the FRP pipe is used for being vertically installed in a cavity of a pile hole; and the cavity of the pilehole and the through hole of the FRP pipe are used for casting grouting. According to the FRP composite micro pile and the manufacturing method, an FRP material is used for replacing a traditional rebar or structural steel, and the FRP material and cured cement-based slurry form a pile body; and the FRP material has extremely high corrosion resistant capacity, excellent mechanical performance andgood machinability, the FRP material has similar deformation modulus with the cement-based slurry, the FRP material and the cement-based slurry can achieve collaborative work, the respective performance is given full play to, and the corrosion resistant performance and the bearing performance of the pile foundation are remarkably improved.

Description

technical field [0001] The invention relates to the technical field of engineering pile foundations, in particular to an FRP composite micro pile and a manufacturing method thereof. Background technique [0002] Micro-piles refer to bored piles with a diameter of no more than 300mm and built-in reinforcing materials. Usually, pressure grouting is required to improve their bearing performance. At present, there are two main methods of manufacturing micro piles at home and abroad. One is to build a single large-diameter high-strength steel bar or section steel in the borehole, and then perform pressure grouting in the hole. The grouting fluid is mostly cement grout. The method is common in foreign countries; the other is to use multiple steel bars to form a steel cage instead of the above-mentioned single steel bar or section steel, and then cast stones in the holes for grouting or directly pour fine stone concrete (including grouting materials), this method is commonly used i...

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Problems solved by technology

[0004] However, since the two materials that make up the micropile are steel and cement paste / concrete, steel is a corrosive material with poor corrosion resistance, while cement-based paste and concrete are both brittle materials that are prone to cracking when subjected to tension and are difficult to install. Form effective protection for steel bars or section steel; in addition, the deformation moduli of the two materials are quite different, so that there is a problem of deformation inconsistency between the two when they are deformed by force, and the performance of the two materials has not been fully utilized; again , increasing the cross-sectional area of ​​steel or section steel can neither fundamentally solve the corrosion problem, but also increase the cost; while coating the surface of steel bar or section steel with an anti-corrosion layer, or wrapping a corrosion-resistant polymer sheath, increases the cost of corrosion at the same time. Technical difficulty and engineering cost, and once the protective layer is damaged during construction, it cannot be repaired on site

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