Singapore Punggol Bridge Project

What are wind resistance measures for HZQ59/80 bridge launching girder machine?

FAQ 七 11, 2012 No Comments

Wind resistance measures for HZQ59/80 bridge launching girder machine

Safe wind resistance is also an important daily job as operating the HZQ59/80 bridge launching girder machine, professionals to monitor and check is necessary.

launching girder machine on the bridge piers

launching girder machine on the bridge piers

Operator must learn the structure of bridge girder launcher and wind resistance operation tips, strictly follow operation regulations, then the job can be done well. Wind resistance can be divided into daily wind resistance and typhoon resistance, see the table below:



Working condition

工 况

Max wind speed


Wind resistance types


1 Complete machine crosses piers and moves laterally


16 Daily wind resistance日常防风
2 Normal working condition


22 Daily wind resistance日常防风
3 Additional safety measures are not necessary in the non-working condition


40 Daily wind resistance日常防风
4 Adopt additional safety anchoring measures in the typhoon condition台风情况下采取附加安全锚固措施 50 Typhoon resistance台风防风

Different measures for different wind resistance types, check the following to find details:

A daily wind resistance

In the daily working condition (such as the complete machine crosses piers, moves laterally and installs girder segment), because the bridge girder launcher is fixed with piers or pier top block by support legs, an the same time working anchors are set up for support legs, the bridge girder launcher can still install girder segments and construct with suspended girders with the wind speed < 22m/s; the complete machine can still cross piers and moves laterally with wind speed <16m/s, for special working condition, the machine must work in the limit condition for safety. Electromagnetic hydraulic iron wedge is set up inside of trolley wheels of the bridge girder launcher, when emergency brake is needed because of gust, immediately stop lifting work (or dropping the heavy objects) and moving, cut off power supply for wind resistance iron wedge and stop all operations for the machine. As going off work, move the bridge girder launcher to the crane ground anchor point, trolley stops at the fixed ground anchor point, lock them with Home Drug Methods. corresponding anchors.

When the wind speed > 22m/s, the bridge girder launcher should stop working, check whether general anchoring system is in place, move the lifting trolley to the corresponding anchoring points at the front and rear support legs, anchor lifting trolley, other special wind resistance measures for the bridge girder launcher are not necessary.

B typhoon resistance

When catching a powerful typhoon (wind speed reaches 50m/s), besides daily wind resistance measures, thoroughly anchor the bridge girder launcher. According to the actual condition, pull the wind cable to fix some parts of the lifting trolley. Before the typhoon is coming, replay the original support condition for the front and rear middle support leg whatever condition the bridge girder launcher is. Front and rear middle support legs should be put and fixed on the pier top, lateral connection trusses are respectively set up at front, middle and rear part of the main frame, bottom flange of main frame is stuck on bearing surface of front and rear middle support leg, only allow main frame in vertical plane to turn lightly around horizontal shaft of front and rear middle support leg caused by stiffness. Lifting trolley should move back to the gantry crane support leg point and be anchored.

Besides ways above mentioned, take actual condition into consideration.













Comments are closed.