Double Wire Rope Loop Boxes

Features of HULK Metal Wire Loop Box:

• Design Principles of HULK Metal Wire Loop Box:

  

  l The capacities presented in the tables below are calculated for static loads. Our wire rope loops are not designed to be used for dynamic loading or for lifting. For the capacities to be achieved, there should be no cracks or deformations in the joints.

  l The capacities of the wire rope loops are calculated for a joint as presented in the diagram with seam thickness and reinforcement as outlined in the following sections. The steel boxes and the seam must be fully filled with concrete.

  l The capacities given are the resistances in the ultimate limit state, so please compare them to design loads.

  l The resistance is defined by the weakest concrete in the joint (element/joint concrete). Resistances are calculated for concrete classes C25/30, C30/37, and C40/50.

  Longitudinal Shear Capacity:

  Boxes Centre to Centre	Design Value of Longitudinal Shear Resistance, VRd (kN/m)
  	Standard
  	HM-A, -B, -C, -D		HM-E
  	C25/30	C40/50	C25/30	C40/50
  250	125	159	-	-
  300	117	148	-	-
  350	101	128	182	230
  400	89	112	163	207
  450	79	100	146	184
  500	72	91	131	166
  550	66	83	120	152
  600	60	76	110	139
  650	56	71	102	129
  700	52	66	95	120
  750	49	62	-	-

  The resistance is defined by the weakest concrete in the system, either to fill the joint or the concrete used to make the precast element.

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• Tensile Capacity of HULK Metal Wire Loop Box:

  
  Capacities are shown here per box.

  Box Type	Part No.	Design Value of Tensile Resistance, FRd (kN)
  		C25/30	C40/50
  Standard	HM-A	12.9	12.9
  	HM-B
  	HM-C
  	HM-D
  	HM-E	23.1	23.1

  The resistance is defined by the weakest concrete in the system, either to fill the joint or the concrete used to make the precast element. The distance between wire loop boxes must be as defined later in this section.

  
  

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  Transversal Shear Force:

  Capacities are shown here per box.

  Box Type	Part No.	Design Value of Horizontal Shear Resistance, NRd (kN)
  		C25/30	C40/50
  Standard	HM-A	4.6	5.8
  	HM-B	8.2	10.3
  	HM-C
  	HM-D
  	HM-E

  The resistance is defined by the weakest concrete in the system, either to fill the joint or the concrete used to make the precast element. The distance between wire loop boxes must be as defined later in this section.

  
  

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  Combined Forces:

  For circumstances where there is a combination of forces on the wire loop joints, the following must apply:

   

  VApplied / VRd    =    FApplied /  FRd   =   NApplied / NRd < = 1 

  
  

                                        

  
  

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• Installation of HULK Metal Wire Loop Box:

  The wall elements must be reinforced according to the wall element design.

  
  

  Seam Thickness:

  The size of the wire rope loops must be chosen according to the thickness of the joint to enable the vertical ribbed steel bar in the joint to pass through the wire rope loops on both sides of the joint.

  
  

  Box Type	Part No.	Recommended Thickness of Rope Loop Seam (mm)
  Standard	HM-A	70-90
  	HM-B	90-110
  	HM-C	110-140
  	HM-D	140-190
  	HM-E	160-220

  
  

  
  

  
  
  
  

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  Minimum Edge Distance and Spacing:

  Centre to center Emin = minimum distance between wire rope loops at the same side of the joint.

  Centre to center Cmax = minimum distance between wire rope loops at opposite sides of the joint.

  Minimum width Bmin = minimum total wall width.

  Box Type	Part No	Centre to Centre Emin	Edge Distance Dmin	Centre to Centre Cmax	Minimum Width Bmin
  		mm
  Standard	HM-A	250	100	20	120
  	HM-B
  	HM-C
  	HM-D
  	HM-E	350	200	25	150

  
  

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• Reinforcement of the joint of HULK Metal Wire Loop Box:

  When using wire rope loops, a vertical ribbed steel bar must always be installed through the wire loops as shown here.

  Box Type	Part No	Recommended thickness of rope loop seam (mm)
  Standard	HM-A	12
  	HM-B	12
  	HM-C	12
  	HM-D	12
  	HM-E	16

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  Case 1 – Where wire loops are used to transfer forces.

  When HM wire rope loops are used to transfer forces in the joint, the anchorage of the wire rope loop must be secured by overlapping the wire rope loop sufficiently with the reinforcement of the concrete element. This should be done according to the engineer’s design depending on your precise arrangement.

  Where the wire loop is used in a corner joint a reinforcing bar should be installed into the inner edge of the fold of the RVL wire rope loop, the diameter of this bar should be the same as the reinforcement installed in the joint.

  
  

  
  

  
  

  
  

  
  

  
   

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  Case 2 – Where HM wire loops are not used to transfer forces.

  When wire rope loops are used to limit cracking of the seam or to tie elements together without defining the required force, additional reinforcement in the wall is recommended as shown here, including 2 No 10mm diameter additional bars in each piece.

  
   

  Attachment to the formwork:

  The wire rope loop box must be attached securely so it cannot move during the casting of the concrete. At the wire rope loop, the concrete must be compacted carefully as the loop cannot be vibrated. The wire rope loop boxes may be fastened to formwork with nails or by magnets.

  The part of the wire rope that enters the concrete element is installed amidst the reinforcement and does not need to be tied to the reinforcement.

  
  

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