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1. (WO2018044178) BOLT TENSIONING ASSEMBLY AND METHOD FOR TENSIONING OF A BOLT
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C l a i m s

1. Bolt tensioning assembly (4) comprising:

- a bolt (1) comprising a first end portion (11) and a second end portion (12) at an oppo- site side of the bolt (1 ), wherein the first end portion (11 ) is provided with an enlarged di- ameter to form a counter-pressure surface (13) facing the second end portion (12); and wherein the first end portion (11) is further provided with external threads to receive a lock nut (2);

- a hydraulic bolt tensioning device (3) for tensioning of the bolt (1), the hydraulic bolt ten- sioning device (3) being arranged for enclosing a portion of the bolt (1) such that it abuts the counter pressure surface (13); and

- a lock nut (2) arranged on the first end portion (11) of the bolt (1);

wherein the hydraulic bolt tensioning device (3) and the lock nut (2) are dimensioned such that upon tightening of the lock nut (2), the lock nut (2) will tighten against a portion of the hydraulic bolt tensioning device (3).

2. Bolt tensioning assembly (4) according to claim 1 , wherein the enlarged diameter of the first end portion (11 ) of the bolt (1 ) is provided by means of a nut arranged on the bolt (1 ) said nut being provided with external threads for receiving the lock nut (2).

3. Bolt tensioning assembly (4) according to claim 1 , wherein the first end portion (11 ) of the bolt (1) is an integral part of the bolt (1).

4. Bolt tensioning assembly (4) according to any one of the preceding claims, wherein the hydraulic bolt tensioning device (3) comprises a cylinder house (31), a piston (32) and a piston rod (33).

5. Bolt tensioning assembly (4) according to claim 5, wherein the piston rod (33) is a portion of the bolt (1) which is to be tensioned.

6. Bolt tensioning device (3) in the bolt tensioning assembly (4) according to any one of the preceding claims, wherein the bolt tensioning device (3) is arranged to be locked between the lock nut (2) and a structural element (5) which the second end portion (12) of the bolt (1) has been connected to.

7. Method for tensioning of a bolt (1 ) which is used for connecting two structural elements (5), the method comprising the steps of:

- providing a bolt tensioning assembly (4) according to any one of claims 1-5;

- securely connecting the second end portion (12) of the bolt (1) to the structural elements (5);

- providing hydraulic pressure to the bolt tensioning device (3) such that the bolt (1) is tensioned;

- tightening the lock nut (2); and

- removing the hydraulic pressure.