The bridge erectioncraneis also divided into different types, including highway type, railway type, Highway railway dual purposetype, segment assembled typeand transportatingand erecting type. It is a walking typegirder launcherand is one of our newly developed products. Its main girder is designed with a truss structure, and is welded using structural steel and steel plates to provide a lightweight and strong wind resistance. This productis designed to suit the building of high gradient, small radius curved bridges, 45 degree inclined bridges and bridges near tunnels. It also makes construction on plains areas much easier.
Highway bridge girder erection machine is used in the erection of precast beam bridges for span by span method of construction for precast beam girders like U-beam,T-beam,box-beam,etc. It's very suitable for bridge construction over river, valley and highway construction.
Our company can produce highway bridge erection crane, railway bridge erection crane, bridge erection crane for highway & railway, U-beam bridge erection crane, segmental assembling bridge erection crane. The product is suitable for highway, railway construction in mountainous areas, to meet the requirements of bridge erection in large slope, small radius curved bridge, inclined bridge and tunnel portal. Similarly, it is more convenient in good construction conditions in plains.
Bridge erection crane can be also called girder launcher, launching gantry or bridge building machine.
The girder launcher produced by our company has a conventional tonnage of 30-900t and span of 0-60 meters, but also can be non-standard design at the request of customer.
Main structures and functions
The main structure of the bridge erection crane is connected by pins and flanges, for convenience of transportation and on-site installation. See the structure in the general assembly diagram. By structure, the crane can be divided into main beam, lifting trolley, front legs, middle legs, anti-bracket, back legs, walking track, hydraulic and electrical parts, which constitute a complete structural system.
Main characteristics of highway bridge erection crane, bridge erection crane for highway & railway, U-beam bridge erection crane
(1) The main girder is in truss-type structure, welded by section steel and steel plate, with advantages of light structure, rigid and reliable, strong wind resistance capacity, convenient for installation, beautiful look. For transportation concern, main beam of each row is divided into several segment, not more than 12m each, connected by pin roll.
The distance between the middle of the main beam is 6.5-7m, so the global reliability is better and can meet the requirements in work conditions of small curve and skew bridge.
(2) The passing hole and the launching beam with slow speed, has the advantage of small impact, good stability, and more secure.
(3) The trolley lifting, in the form of self-made national standard trolley, without outsourced winch, has big brake torque and good brake performance. The drum is equipped with a rope groove to prevent chaos rope. The baffle on both sides of the drum is extra high and thick, to increase the safety factor. The safety performance is 1.5 times higher than the hoist type car.
(4) The walking motor, from a well-known domestic supplier, has current overload protection that allows self-protection in case of unstable voltage without damage motor and delivers good brake results.
(5) Transverse rail is long, which can fulfill the requirements for erection of double amplitude bridge.
(6) Speed of passing through holes and bridge erection is fast. The construction record is achieved: two span erection and two span pass in one day.
(7) The bridge erection crane production standard is one level higher than national standard:
▸Lifting wire rope safety factor ≥ 5
▸Structural strength calculation safety factor ≥1.5
▸Mechanical transmission parts safety factor ≥ 1.5
▸Over-hole anti-overturning safety factor ≥ 1.5
(8) Side beam is installed in place at one time, which is safe and reliable.
(9) Girder launcher is two-way, for which front and back legs are interchangeable. Do not have to turn the reverse beam.
(10) Main beam has safety pathway, which is very rare.
(11) Erection for small curve beam (curve radius 100m) and big slope beam (7%) can be customized. There is successful reference. Common bridge erection crane can only meet 300m curve radius and 5% slope.
Railway Bridge Ecrection Machine Girder Launcher
Bridge Girder Erection Machine