MICROPILE PIPES
MICROPILE PIPE
The use of the micropile pipe, massively, occurred in the 80s of the last century. This construction technique allowed the entire repertoire of construction activities to be resolved in a very favorable way. A micropile, technically, is a small diameter pile. Since the usual piles until the date of their appearance were concrete piles, the reference diameter is therefore 30 cm, a diameter widely used in the machinery of the “in situ” construction technique of concrete piles.
Since the micropiloting technique derives from the oil prospecting, the discarded pipes, were reused for another purpose, such as the possibility of underpinning foundations, or even the execution of new foundations.
When it comes to steel pipes, of good quality, the micropile, has the ability to work in tension and compression, which surpasses, with advantage, the usual reinforced concrete pile, which is basically designed to work in
compression, not excluding a certain capacity to work in traction, but, logically with much less capacity than the metal pipe micropile. But where the micropile far exceeds its operational capacity is the possibility of working at different inclinations, including vertically and against gravity.
MOST COMMON USES
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Special foundations
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Screen walls in small spaces
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Road slope stabilization
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Building rehabilitation
La técnica de perforación, más propia de la construcción de los tirantes de acero para la estabilización de muros, se ha aplicado a la construcción de micropilotes, consiguiendo por hibridación una nueva tecnología, muy potente que permite una gran variedad de soluciones estructurales. Así, cuando la tubería de acero, se coloca en el interior de una perforación, si se inyecta mortero líquido a presión, permite quedar rodeado de mortero que, al endurecer, queda en contacto con el terreno. Si la tubería trabaja a compresión, al formar una unidad estructural rígida, se comporta como un pilote convencional.
Description of the different types of injection
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(UI) “Unique Global”: it is injected in one phase from the lower base of the reinforcement tube, from where the filling material rises between the walls of the latter and that of the jacket if there is one, or of the ground if there is none. The injection pressure must be greater than half the limit pressure of the ground and less than said limit pressure. It would be suitable for more or less sound rocks, very hard cohesive soils and granular soils.
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(IR) “Single repeat”: the injection is carried out in two phases, the first as in the IU case and later through grids made along the length of the tube. Once the process is finished, a final injection of filler of the tubular reinforcement is made. The pressure in the mouth of the drill must comply with the same as in the IU type. The injection is carried out between 500 kPa and half the limit pressure of the ground. Suitable for soft and fissured rocks and coarse granular materials of medium compactness.
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(IRS) “Selective Representative or Repetitive”:through non-return valves arranged along the reinforcement pipe. It can be injected more than twice, depending on the grout intake. The injection pressure is high, between 1000 kPa and half the limit pressure of the ground. Once the process is finished, a final filler injection of the tubular reinforcement is carried out. It would be suitable for not very hard cohesive soils, soils of low or medium consistency and granular soils where you are trying to create a bulb.
TECHNICAL SPECIFICATIONS
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Steel type N-80
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API 5 CT Regulations
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Yield strength ≥552 Mpa
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Breaking limit ≥689 Mpa
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Outside Ø tolerance of ±1%
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Length between 10-12 meters
TUBE DIMENSION
UNION THREADS AND VALVES
We prepare the rocks according to the characteristics required in each project:
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Round
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Rotopercussion round
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Square
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