Checking opening dimensions

Tool(s): Create coupler connection to close small opening

When small openings are closed by a coupler connection, the program checks whether the required minimum and maximum distances are complied with. These distances are defined by the selected turnbuckle, position coupler or special connection.

Opening dimensions of SAH turnbuckle

You can use turnbuckle T3105 to connect threaded bars that are not free to move lengthwise and cannot be rotated either. The required bar spacing is obtained by subtracting the minimum length of thread engagement (L1) of the coupling bar and (Lw) of the connecting bar from the length (L) of the turnbuckle. A turnbuckle consists of a tensioning coupler and a change-over coupler, which is screwed into the tensioning coupler by the value minA.

The minimum and maximum spacing of the threaded bars is calculated from the required bar spacing plus/minus a tolerance of 5mm.

Opening dimensions for LENTON couplers P13LN and P14LN

• Position and transition couplers P13LN are used to splice bars which cannot be rotated and where the ongoing bar is restricted in its axial movement. The minimum distance is therefore defined by the value Fc+B-D (or D1), which is obtained from the completely screwed bolt with lock nut.
• Position and transition couplers P14LN are used to splice bars which cannot be rotated. The ongoing bar, however, is not restricted in its axial movement. The minimum distance is therefore obtained by subtracting the difference between the length of thread engagement (D or D2) and the fivefold thread pitch of the ongoing bar from the value Fc+B-D (or D1).
  This table shows the thread pitch in relation to the diameters:

  d < 20 mm 20 mm <= d < 50 mm 50 mm <= d

  = 1.25 mm = 2.00 mm = 3.00 mm

• The maximum distance is obtained by subtracting the length values of thread engagement (D) of the coupler bar and ongoing bar from the value Fo max+B. Fo max is the maximum bolt length that can be unscrewed.

Opening dimensions for BARTEC special connection of the DGB type

The bar spacing must always be 25 mm, regardless of the diameter. This results in a clearance of +/- 25 mm. Please note that the special connection of the DGB type requires intermediate reinforcement which needs to be connected with the reinforcement around the edge of the opening to be closed. This reinforcement is not automatically created by Allplan. You do not need to take into account the special features.