The Overview of Segmental Assembly Bridge Girder Launcher
According to field working condition in Singapore, combined with ZZHZ successful design experience of bridge girder launcher, HZQ59/80 segmental assembly bridge girder launcher is designed as honeycomb type double girder machine, which features as below:
The Fabrication Process of Bridge Girder Launcher
Launching Gantry
a. the bridge girder launcher mainly uses Q235B steels: the butt welds of cover board and web board, the outer lead weld of cover board and web board adopts Lincoln weld, other welds use CO2 gas shielded welding; welding material: welding rod of Lincoln weld H08A, and HJ431; welding rod of CO2 gas shielded welding: ER50-6; the electrode of tack welding uses J422 when the machine is assembled. The 100% ultrasonic inspection should be done for butt welding, the acceptance standard is GB11345-89, and the grade of welding quality is I grade; the welds between cover board and web board adopt melt thru weld, the 100% ultrasonic inspection is done after welded, and I grade is qualified. All of T joints do X-ray detection, the acceptance standard is GB3323-87, and the grade of welding quality is II grade.
The Checking Methods of Bridge Girder Launcher
ZZHZ has very rich experience of producing bridge girder launcher, so it can give some advice to us:
We should check geometry size, verticality, horizontality and deflection etc. after the structures are installed completely:
How to avoid the accidents of the bridge girder launcher?
The accident is easy to happen when bridge girder launcher moves from one pier to another pier. In order to finish the construction easily and guarantee the safety of workers. ZZHZ gives us some advice as following:
The Compositions of Bridge Girder Launcher
Walking bridge girder launcher is made up of main girder, lifting trolley, front legs, middle legs, rear legs, rear bracket ,electrical system and hydraulic system etc.
1)Main girder
The main girder and guiding girder is made up of bearing girder , front and rear connecting frames.
Front and rear connecting frames are made up of transverse girder, pull rod, reaming base and pin. Forming a closed stable structure with right and left main girder is their main function.
The Features of Bridge Girder Launcher
ZZHZ(zzhz.com) has very rich experience of producing?bridge girder launcher?; therefore, it can give us some advice to use it:
1?Application range and use
The bridge girder launcher is designed for highway and railway. According to the situation of present? railway with less sub grade, more bridges and tunnels which connetced too closely, our company design and manufacture the new box-girder bridge girder launcher with double girder. It is mainly used for hoisting? of concrete girder in bridge construction of general railway and highway.
Safety Measure of Bridge Girder Launcher
ZZHZ has very rich experience of producing , therefore, it can give ussome advice about the safety guarantee measures:
1. Organization measure
Set up safety leading group headed by general manager. Group leader and group members
2. Safety training measure to install the boundary beam
A. in accordance with related rule, formulate safe operation implementing regulations. Have a safety technology disclosure to construction personnel and carry out safety education
B. organize constructor to have a safety technology training and assessment before installing girders. Therein, for special type of constructor, they must be employed with the certificate, for all who participate in installing the boundary beam and access to the worksite, it is needed to wear safety protective equipment.
The Routine Maintenance of Bridge Girder Launcher
1. Regularly check whether the bridge girder launcher travel switch and hammer switch are safe and reliable, whether limit stop block can be in reliable collision.
2. Mechanical shock exists in mobile equipment, please regularly check whether connection point in the control cabinet is tight, especially screw terminals
The Advantages of Walking Type Bridge Girder Launcher
(1) After researching and analyzing current highway bridge construction machine at home and abroad, combining with our successful experience, we develop and produce the new walking type bridge girder launcher according to practical situation. The main features are following:
1. First-made honeycomb girder in China with light self weight, heavy load and strong wind resistance etc.
2. The launching crane conforms to the features of construction of present bridge which form is novel and structure is reasonable.
3. the main girder and main connecting structures adopt the mature pin connecting mechanism, it is very firm and reliable, and the assembly and disassembly are rapid and convenient.
4. It doesn?t need to pave the longitudinal rails. It not only can reduce the stress of bridge, but also can save the cost of construction. It has a wide adaptability for the box girder.
5. In order to make the bridge girder launcher can adapt the longitudinal slope and transverse slope, the machine adopts legs which can move forward by it. And the force which the bridge bears should be reasonable and safe;
6. Front and middle legs can be adjusted randomly and core plate with adjustable angle which can adapt the erection of curved bridge and Slope Bridge. According to angle of Slope Bridge, the user can adjust the front and middle legs when Slope Bridge is erected. Therefore, it can be used for 45?and less than 45? any angle slope bridge
7. Transverse trolley is added to the lifting trolley, the whole machine traverses with boundary beam which resolve the problem of installation of boundary beam.
What’re test run of hydraulic system of bridge girder launcher?
1.Test run of hydraulic systems of bridge girder launcher should follow the procedures below: connect the power supply, start the oil pump, run under the condition without load. Watch whether oil pump turning direction is correct, monitor whether oil pump runs with noise and other bad conditions, test run without load 5-10 minutes; close relief valve, each oil cylinder stretch out and back 4-5 times under the condition of total travel to eliminate air in the system as far as possible; after finishing test with load and test without load above, check whether all mechanical, institution, hydraulic and electrical parts work well, put it into use if it works normally.
