Coupling for anchor bars

Details Coupling for anchor bars Coupling for anchor bars

E - Fixed Constructions

21

B

E21B 17/042 (2006.01)

Patent

CA 2204544

For coupling anchor bars (2) of injection anchors, the anchor bars are screwed with their outer threads (4) into a coupling sleeve (1) provided with a corresponding inner thread (5). One of the two anchor bars (2) screwed into the coupling sleeve (1) has a chamfered surface (8) formed by an end chamfer and lies on a break (6) of the inner thread (5) of the coupling sleeve (1). The second anchor bar (2) is screwed into the coupling sleeve (1) until its end face (9) lies completely on the end face (9) of the other anchor bar (2). This ensures an advantageous transmission of forces during drilling and prevents the coupling sleeve (1) from turning during drilling.

Afin d'accoupler des tiges d'ancrage (2) d'ancres de forage par injection, les tiges d'ancrage (2) sont pourvues de filetages extérieurs (4) qui permettent de les visser dans un filetage intérieur correspondant (5) d'un manchon d'accouplement (1). Une des deux tiges d'ancrage (2) vissées dans le manchon d'accouplement est pourvue d'une surface chanfreinée (8) formée par un chanfrein à son extrémité. Cette surface chanfreinée (8) s'appuie sur une interruption (6) du filetage intérieur (5) du manchon d'accouplement (1). La deuxième tige d'ancrage (2) est vissée dans le manchon d'accouplement (1) jusqu'à ce que sa surface d'extrémité (9) s'appuie entièrement sur la surface d'extrémité (9) de l'autre tige d'ancrage (2). On assure ainsi une transmission avantageuse des forces pendant le forage et on empêche le manchon d'accouplement (1) de tourner pendant le forage.

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