Archive for "FAQ"

What is single girder launching gantry?

FAQ Sep 18, 2015 No Comments

As one of bridge construction machinery, the single girder launching gantry is set with one box girder suspension arm extending forward and one folded column (made up of left and right support legs)at its front.


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How to lift and lower the precast girders for launching gantry?

FAQ Sep 14, 2015 No Comments

Below steps will teach you lifting and lowering the precast girders :


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What is the history of honeycomb girder?

FAQ Sep 10, 2015 No Comments

Infrastructure construction projects in the world are on the rising at late 20th century, all kinds of bridges appear. And gantry crane and launching gantry provides convenience for smooth construction.

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Welcome to visit our booth E2557 in BICES 2015

FAQ Sep 09, 2015 No Comments

ZZHZ will take part in Beijing International Construction Machinery Exhibition & Seminar held at September 21-25, 2015 in Beijing, China. Welcome to visit our booth E2557.

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How about connecting bolts of overhead launching girder?

FAQ Aug 28, 2015 No Comments

As all parts of overhead launching girder are produced, they need to be connected together by connecting bolts as below:

bridge building crane


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What should you do before using one launching girder?

FAQ Aug 27, 2015 No Comments

When a bridge will be constructed, one launching girder comes out in my mind natually, which may be professional sense.


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What are common bridge construction methods?

FAQ Aug 25, 2015 No Comments

In my 4 years of work, I learn below common bridge construction methods:

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About honeycomb girder made by ZZHZ

FAQ Aug 24, 2015 No Comments

It is in the worksite operation that we realize a launching gantry between truss girder and box girder is needed, it is better if we can combine high stiffness of box girder and high wind resistance of truss girder, so we deign the honeycomb girder. The honeycomb hole allows wind to go through, and the web plate ensures a higher stiffness, as for why it is a honeycomb hole, it is a kind of craftmanship and it does not cost much.


Metal processing equipments and heat treatment equipments in ZZHZ?

FAQ Aug 21, 2015 No Comments

Main metal processing equipments

No Item Model Quantity Main technical specification
1 Center lathe C61125A 1 φ1250×8000
2 vertical type gear hobbing machine ZS7Z25 1 φ1
3 Boring machine T6216 1 φ160×4000
4 Structural steel sawing machine H650HD 1 Max cutting capacityφ300mm

Heat treatment equipment

No Item Model Quantity Main technical specification
1 Heat treatment equipment   1 Table model heat treatment
2 Weld joint heat treatment R-500 2 Track heater


How about Rivet weld and smooth cutting equipment for fabrication of launching gantry?

FAQ Aug 20, 2015 No Comments

Rivet weld and smooth cutting equipment

main girder

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