What is Repeated Welding Method for Crane Main Girder Deformation?
Principle for repeated welding method: weld repeatedly with heavy current main girder weld joint, correct original deformation by welding deformation generated by repeated welding. If it is needed to increase main girder camber, start a repeated welding on two fillet weld joints between bottom cover plate and web plate of main girder. The pressure caused by cooling shrinkage of weld joint will increase camber. If it is needed to reduce horizontal bending, start a repeated welding on two fillet weld joints between web plate at convex side and top, bottom cover plates. Weld current and length should be decided according to correction degree. Repeated correction caused by out of limits should be avoided.
LDhz20t single girder bridge crane
What is Pre-stressing Force Method for Crane Main Girder Deformation?
Principle for using pre-stressing force method to correct main girder down-warp: use pre-stressing force to stretch-draw many steel bars or steel wire ropes at two ends of main girder bottom cover plate by fixed support, make main girder bear a bending moment (main girder upper half bears tensile stress, lower half press stress), and main girder recovers up-warp influenced by the bending moment. When main girder bears loads, working pressure is rightly opposite to the steel bar pre-stressing force which at the same time can counterbalance part of working press stress, thus improve load capacity of main girder.
double girder bridge crane
What is Flame Straightening Method for Crane Main Girder Deformation?
Sometimes ZZHZ will use flame straightening method to correct crane main girder deformation. Flame straightening method refers to that local heating on the metal structure produces plastic compression on some places and remained local shrinkage stress can correct the bend after cooling.
gantry crane
What is THQ900t Bridge Girder Launcher for Tunnels?
1. Range of application and purpose
ZZHZ develops THQ900 bridge girder launcher for tunnels and THY900B girder transporter to solve construction technical problems below:
a. High speed railway bridges and tunnels are connected frequently
b. The bridge girder launcher and girder transporter need to smoothly pass the tunnel to install girders
THQ900 bridge girder launcher in tunnels and THY900B girder transporter can meet the demand to install double track whole span box girder32m, 24m, 20m for passenger special line, as well as meet the demand of span shift, tunnel entrance and exit 6m abutment and erecting curved bridge.
THQ900t Bridge Girder Launcher for Tunnels
Emergency Plan 2 for Gantry Crane Dismantling, Transportation and Installation
?Preventions and Emergency measures
1. Work out relevant accidents emergency plan according to provisions and actual conditions of gantry crane installation project and report to the leading group
2. Accident emergency plan should include the followings:
1) fault type and signs which appears in daily operation and could cause an accident, and their solutions
2) Organization management network and rescue personnel for special equipment accidents emergency rescue
3) Responsibilities to deal with the accident for corresponding equipment operators, maintenance workers and duty officer for safe production
HZQ30/80 bridge crane
Emergency Plan 1 for Gantry Crane Dismantling, Transportation and Installation
(1) The general provisions
1 In order to prevent, control and eliminate the hazards of the sudden accident in the process of gantry crane installation effectively and timely; minimizing the losses caused by the accident; safeguarding the interests of the society and enterprises; protecting the safety of the personnel and property, we make the emergency plan combining with the actual circumstances of the project and according to the requirements of the <<Regulation on safety supervision for special equipment>> and << Safe Production Act>>
Lifting equipment
What are Safety Operation Specifications for Bridge Construction Crane?
Bridge construction?crane is used as lifting machinery equipment in the?bridge construction.? How to operate the overhead crane safely is as follows:
HZQ32-165 bridge construction crane
What is the brief introduction of R&D centre of ZZHZ?
ZZHZ isChinaleading manufacturer and exporter for hoisting machinery and construction machinery such as: Gantry crane, overhead crane, bridge construction crane, concrete spraying system, concrete batching plant, backhoe loader and other machinery.
ZZHZ R&D CENTRE
The Overview of Segmental Assembling Launching Gantry
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 Hydraulic System of Bridge Girder Launcher
The bridge girder launcher is equipped with 7 sets hydraulic systems which are provided by authorized and qualified manufacturers
and are made up of hydraulic station, hydro-cylinder, oil way and other parts; one set hydraulic systems is respectively set up on the
front support leg, front middle support leg and rear middle support leg, convenient operation and independent control; one set hydraulic
system is respectively set up at left and right side of the gantry crane 90?rail change turning system, convenient operation and independent
control; one set hydraulic system is respectively set up for lifting trolley lateral moving system and vertical and horizontal leveling system
of the sling, remote operation and integrated control.
Launching Gantry
