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Steel to Steel Connections: BoxBolt vs Traditional Methods

28 August 2018

The BoxBolt® blind fixing solution is an alternative to traditional steel to steel fixing methods which could help you to make major savings on both cost and design time.

BoxBolt® is fully tested and approved, suitable for use with rectangular, square and even circular hollow sections, and simple to install using our BoxSok® installation tool thanks to the hexagonal head design. BoxBolt® is perfect for when installation time needs to be kept to a minimum.

Not only is BoxBolt® simple to install, it also requires no special knowledge or permits, meaning you can also save money by using it over more common solutions.

As an example, we’ve compared the costs of traditional opposite connection solutions with our BoxBolt® blind fixings, to show just how much you could save.

 

 

The opposite connection is a very common connection for steel hollow sections and below are the costings for various solutions including BoxBolt®.

 

Drilled, tapped and bolted detail (M16 high tensile bolts)

Connection Requirements Rate/hr (£) Time (hrs) Step Cost (£) Details of each step
Engineering 46 0.5 23 Detailing the positions and checking the integrity of the exiting steel after adding holes
Marking of steel 26 0.5 13 The time required to mark the steel on site to ensure alignment with secondary member
Site set up 40 0.25 20 The time required to access power, get the drilling machine into position
Drilling time on site 40 1 40 Based on a steel thickness of 12mm and 1/4 hr per hole
Tapping on site 40 0.5 20 Half the time to tap
Tightening of bolts 40 0.2 8 High torques required so allowing for 5 mins per bolt and nut
Drill bits/taps NA NA 20 1 drill bit and 1 tap at £10 each
Material costs NA NA 10 Four bolts, butts and washers at £2.50 each
         
Totals   2.8 £154  

 

Welded detail (fully fillet welded connection to red oxide or galvanised steel)

Connection Requirements Rate/hr (£) Time(hrs) Step Cost (£) Details of each step
Engineering 45 0.25 11.25 Not much design work required apart from highlighting the position of holes
Apply for hot work permit 35 0.50 17.50 The issue time is set at 30 mins which can be much longer
Marking of steel 30 0.25 7.50 The marking of the steel is at a minimum for a welded connection
Site set up 30 0.50 15 Time to move equipment, power cords and get machinery ready
Removal of corrosion protection 40 1.0 40 The whole area for the weld needs to be removed by grinding and is time consuming
Performing of weld (inc equipment) 70 1.0 70 Based on a certified welder and equipment to make the connection
Fire watch during and after welding 30 2.0 60 Fire watches can be over longer periods but this is set at 2 hours after welding
Touch up of galv/paint 30 0.33 10 Replacement of the galv/paint will not be as good as the original finish
Non destructive testing 40 0.33 13.2 Testing of the weld required to prove load capabilities
         
Totals   6.16 £244.45  


BoxBolt® connection (four m16 BoxBolts connecting into 12.5mm)

Connection Requirements Rate/hr (£) Time (hrs) Step cost (£) Details of each step
Engineering 45 0.25 10 Detailing the positions and checking the integrity of the exiting steel after adding holes
Marking of steel 26 0.25 6.5 The time required to mark the steel on site to ensure alignment with secondary member
Site set up 40 0.25 10 The time required to access power, get the drilling machine into position
Drilling time on site 40 0.25 10 Based on a flange thickness of 12.5mm and 1/4 hr per hole (see cutting speed rates)
Tightening of bolts 40 0.20 10 High torques required so allowing for 5 mins per bolt and nut
Material costs (bolts) NA NA 39.96 Four BoxBolts® (BQ1G16) @ £9.99 each
         
Totals   1 £86.46  

 

As you can see from the above tables, not only is BoxBolt® the clear favourite in terms of cost savings, but also in time and effort.

BoxBolt® provides the same secure connection as traditional solutions with greater benefits for architects and installers.

For more information, click here, or to talk to us about a quote call 020 8874 6566 or use our online contact form.