Rockbolt made of steel pipe

E - Fixed Constructions – 21 – D

Patent

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Details

E21D 20/00 (2006.01) C23C 2/06 (2006.01)

Patent

CA 2564941

A pressurized fluid injecting sleeve (10) to be mounted on a lock bolt main body (1) is composed of a cylindrical large-diameter projection (11) and a small-diameter washer holder (12), the outer diameter of the washer holder (12) being smaller than the hole diameter of a washer (6). It is desirable that the large-diameter projection (11) and washer holder (12) be equal in inner diameter. With the lock bolt main body (1) embedded in bedrock or ground, the washer (6) is seated on the edge of a lock bolt insertion hole, while the washer holder (12) extends into the lock bolt insertion hole. Therefore, the members projecting from a sprayed concrete layer disposed on the bedrock or ground are only the washer (6) and large-diameter projection (11). The height of projection is restrained, and thereby, the placing of lining concrete can be easily done to make reinforcing work of high reliability possible.

Un manchon d'injection de fluide sous pression (10) destiné à être monté sur le corps principal (1) d'un boulon de blocage est constitué d'une saillie (11) cylindrique de diamètre élevé et d'un support de rondelle (12) de faible diamètre, le diamètre externe du support de rondelle (12) étant inférieur au diamètre du trou d'une rondelle (6). Il est souhaitable que la saillie (11) de diamètre élevé et que le support de rondelle (12) possèdent un diamètre interne égal. Lorsque le corps principal (1) du boulon de blocage est noyé dans un substrat rocheux ou dans le sol, la rondelle (6) repose sur le bord d'un trou d'insertion de boulon de blocage, tandis que le support de rondelle (12) s'étend dans le trou d'insertion de boulon de blocage. Par conséquent, la rondelle (6) et la saillie (11) de diamètre élevé sont les seuls éléments qui font saillie à partir d'une couche de béton pulvérisé disposée sur le substrat rocheux ou le sol. La hauteur de la saillie est restreinte, ce qui facilite la mise en place du béton de revêtement et permet donc un travail de renforcement de grande fiabilité.

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