Reinforcement and Minimum Thickness for Sockets with Cross Hole, Flat End and Long Wavy Rebar

Reinforcement and Minimum Thickness for Sockets with Cross Hole, Flat End and Long Wavy Rebar

Lifting System with Sockets

When using lifting inserts, precast elements must be provided with a minimum surface reinforcement (cf. table 1) and concrete must have a minimum strength of 15 MPa at first time of lifting.

Existing static-structural reinforcement may be taken into account. The user is personally responsible for further transmission of load into the unit.

Table 1: Minimum reinforcement

Minimum reinforcement
ReferenceLongitudinal reinforcement FeE500
[mm]
Longitudinal reinforcement FeE500
[mm]
Surface reinforcement FeE500
[cm2/m]
12∅ 108501.31
14∅ 108501.31
16∅ 108501.31
18∅ 128501.88
20∅ 128501.88
24∅ 128501.88
30∅ 1610001.88
36∅ 1610001.88
42∅ 1610001.88
52∅ 2012001.88

This minimum reinforcement can be replaced by comparable stirrups with longitudinal reinforcement. Diagonal tension requires additional reinforcement (table 3).

For transmission of load into the concrete, a reinforcement stirrup of FeE500 is inserted through the cross hole of the lifting socket.

Contact of reinforcement and insert has to be ensured in suitable manner (binding wire, but no welding).

Lifting sockets must be used in units with minimum dimensions according to table 2.

Table 2: Minimum axis distance, edge distance, minimum thickness of unit

ReferenceMinimum axis distance
(a)
[mm]
Minimum edge distance
(b)
[mm]
Minimum thickness of unit
(c)
[mm]
1230015060
1440020060
1640020080
18500250100
20550275100
24600300120
30650350140
36800400200
421000500240
521200600275

In case of lateral and diagonal tension, minimum reinforcement (table 1) must be strengthened by additional reinforcement (table 3 and 4).

Additional reinforcement must have pressure contact with the insert. Diagonal tension reinforcement is arranged in the opposite direction of that of tensile force.

Table 3: Additional reinforcement on diagonal tension (necessary if β ≥ 12,5°)

Additional reinforcement on diagonal tension (necessary if β ≥ 12,5°)
Additional reinforcement on diagonal tension (necessary if β ≥ 12,5°)
Additional reinforcement on diagonal tension (necessary if β ≥ 12,5°)
Referencerebar ∅
FeE500
[mm]
L

[mm]
∅ Bending Diameter
dbr
[mm]
12615024
14620024
16820032
18825032
20830032
241030040
301240048
361455056
421660064
5220750140


Table 4: Additional reinforcement on lateral tension (necessary if γ ≥ 7°)

Additional reinforcement on lateral tension (necessary if γ ≥ 7°)
Additional reinforcement on lateral tension (necessary if γ ≥ 7°)
Referencerebar ∅
FeE500
[mm]
L

[mm]
H

[mm]
∅ Bending Diameter
dbr
[mm]
1262703524
1483504232
16124204932
18124605548
20124906448
24125207548
30165709264
361669011864
421683014364
5220930174140


Tilt-up of slabs can lead to simultaneous diagonal and lateral tensions. Those cases request only lateral reinforcement and also cover diagonal tension.

 

Repeated tilt-down or tilt-up of the unit during installation requires a taking into account of lateral reinforcement.

 

 

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