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How to reconnect overhead crane main girder segments?

Apr 01, 2021

 In actual design, overhead crane main girder length(span) has to suit the width of workshop. Most of the time, its span more than 11.9m.

However, the max inner length of one 40' container is 11.9m. For convenient transportation in container, we have to implement segmented design of main girder.

For example, one overhead crane main girder has a span 20m, then we will design the main girder as 11m &9m segments. At end of segment girder, flange plate with match drill holes are welded for future connection.

After fabricating is finished, main girder segments are connected with high strength bolts.

 
How to reconnect overhead crane main girder segments?

The connection between main girder and main girder, between main girder and end girder shall use high strength bolts .  

High strength bolts pre-tightening torque shall follow below chart:

Bolts materials

Bolts type

M16

M20

M22

M24

M27

M30

8.8 grade

190

370

500

640

950

1300

10.9 grade

265

520

700

900

1350

1800

Please note:

1. In design, Kevino fully consider the camber of main girder after connection;

2. The segment connection position has to avoid mid-span, because mid-span bears the largest load in operation;

3. Bolts connection between main girder and main girder shall be M24,10.9 grade,  the pre-tightening torque value shall reach 900;

4. Bolts connection between main girder and end girder shall be M20, 10.9 grade, the pre-tightening torque value shall reach 520.

How to reconnect overhead crane main girder segments?

Above is brief introduction from Brenda in Kevino Crane.

For any more details about us, please feel free to visit our website: www.kevino-crane.com 

For any inquiry please talk with Brenda via:

Email: brenda@kevino-crane.com

Mobile/ Whatsapp: 0086-15290802640

 

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