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With the development of our national economy, the construction of high speed railway reaches unprecedented upsurge. For 10 years, ZZHZ has been involved in manufacturing construction machinery and hoisting machinery. Therein, bridge girder launcher and gantry crane are widely used in high speed railway construction, being awarded the national patent. Featuring reasonable design, convenient installation and dismounting, especially high safety, they are highly praised by our customers and make great contribution to safe construction of high speed railway. Construction project of Beijing-Shanghai high speed railway will be one of the biggest projects.
According to design construction specification of Beijing-Shanghai railway and hoisting machinery design specification, ZZHZ designed HZQ series bridge girder launcher for China high speed railway, combined advantages of bridge girder launchers of home and abroad. Made up of main girder, front launching nose, O type support legs, front support legs, bottom launching nose, auxiliary overhead crane, auxiliary support leg of main girder, lifting trolley, winch and lifting system, the bridge girder launcher can install 900t precast girder with span from 24m to 32m.
Steps to construct bridge:
(1). After finishing installation on the abutment, the bridge girder launcher will move longitudinally from one pier to next pier
1. Two lifting trolleys move to the end part of the main girder, then lift auxiliary support legs of main girder, the bridge girder launcher begins to move forward.
2. After front support legs moves to certain position, lift its cylinder and fix the leg
3. Front lifting trolley lifts the end of the bottom launching nose to move forwards about half distance of main girder, auxiliary overhead crane under the front launching nose lifts the bottom launching nose to the front abutment, the longitudinal movement is finished.
(2). Transport girders and Feed girders
1. Two gantry cranes lift one precast girder at the same time
2. The transporter carrys the girder to the end of the bride girder launcher, then take back its cylinder. Trolley to move girders on the transporter carrys the precast girder to somewhere below the front lifting trolley of the bridge girder launcher
3. The front lifting trolley lifts the precast girder to move forwards until the rear lifting trolley can lift the rear part of the precast girder, then they move forwards together
4. Put the girder down into designated location
(3). When the bridge girder launcher installs the last girder,
1. Fold up the bottom part of the front leg, then longitudinally move forwards,
2. Support the support leg, then disassemble the rear support leg of the bottom launching nose and remove the launching nose, put down the last girder to finish constructing the whole bridge.
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Which is more economical for movable support system and bridge girder launcher?
Definition from China ZZHZ company Movable support system is a kind of construction machinery to install bridge girders by way of cast-in-place with its own formwork, supported by box girder. Bridge girder launcher realizes bridge construction if the girder carrier transports the prefabricated concrete girder to the rear part of the launcher. Difference between movable support system and bridge girder launcher 1. Without prefabricating concrete girder in the precast girder yard, the movable support system adopts cast-in-place and field maintenance. Averagely it finishes one piece of girder every 12 days. While for the bridge girder launcher, it needs to prefabricate concrete girder, then transport them to be installed on the bridge floor 2. The movable support system has a longer cycle to finish the project but with low investment and high benefit; the bridge girder launcher with a short completion time but high investment 3. With low investment and short preparation time, the movable support system can be fast put into use. While the bridge girder launcher needs a long time to prepare for other equipments such as girder carrier and gantry crane. 4. With less land occupation, the material cost of the movable support system is relatively low. 5. The movable support system is widely used in the mountain area that can not build large-sized precast girder yard, while the bridge girder launcher is popular in large-sized precast girder yard To sum up, it depends on the practical situation. But generally, the movable support system is more economical and more suitable for constrictive economy environment at present and in the future.
What type of bridge is the golden state bridge a i beam girder or a box girder?
beam girder
What type of bridge is th banpo bridge?
The Banpo Bridge is a Girder Bridge.
What type of bridge is a namihaya bridge?
The superstructure is steel box girder
What are the pros and cons of a girder bridge?
pro: you can get over the bridge, con: it breaks if your obese
Which is more economical for movable support system and bridge girder launcher?
Definition from China ZZHZ company Movable support system is a kind of construction machinery to install bridge girders by way of cast-in-place with its own formwork, supported by box girder. Bridge girder launcher realizes bridge construction if the girder carrier transports the prefabricated concrete girder to the rear part of the launcher. Difference between movable support system and bridge girder launcher 1. Without prefabricating concrete girder in the precast girder yard, the movable support system adopts cast-in-place and field maintenance. Averagely it finishes one piece of girder every 12 days. While for the bridge girder launcher, it needs to prefabricate concrete girder, then transport them to be installed on the bridge floor 2. The movable support system has a longer cycle to finish the project but with low investment and high benefit; the bridge girder launcher with a short completion time but high investment 3. With low investment and short preparation time, the movable support system can be fast put into use. While the bridge girder launcher needs a long time to prepare for other equipments such as girder carrier and gantry crane. 4. With less land occupation, the material cost of the movable support system is relatively low. 5. The movable support system is widely used in the mountain area that can not build large-sized precast girder yard, while the bridge girder launcher is popular in large-sized precast girder yard To sum up, it depends on the practical situation. But generally, the movable support system is more economical and more suitable for constrictive economy environment at present and in the future.
What does cause a bridge girder launcher accident?
As a professional manufacturer and seller of bridge girder launcher in China, ZZHZ has witnessed many tragedies: devastating accidents caused by the derail and overturn of the bridge girder launcher. Once it happens, the repair will not only cost a long time and a lot of money, but seriously affect the progress of bridge construction and rail construction. With a rapid development of high speed railway, bridge girder launcher will be used more frequently, if there happens an accident, there will have bigger losses and casualties. 1. Artificial factor Each accident is caused by some artificial factors. Actually, if the construction company builds the roadbed and constructs the bridge with high quality by strictly following related regulations, the accident will not happen. Sometimes in order to drive time limit, related construction company neglects safety measures and work standards, leaving hidden trouble to an accident 2. Roadbed and line factors The main reason to cause an overturn accident of bridge girder launcher is roadbed and railway line with bad quality. In the new line and on existing line, there are some hidden troubles more or less such as grave, arc stone pit, local backfilling, ponding immersing, undercurrents transfusion and so on. Especially the filled soil between bridge abutment and bridge head is not solid, which can cause an accident easily. Railway line with bad quality and with unsmooth slope will lead to overturn and skid of the bridge girder launcher 3. Factors from bridge girder launcher Cantilever type bridge girder launcher need to pass through roadbed of bridge head, lifting precast girder. With a high centre of gravity and large axle load as moving forward, the overturn can happen easily. At present, we mainly adopt single girder (or double girder) type bridge girder launcher. Even though they are more advanced, they still have unreasonable structures such as long body, large self weight, large axle load, higher centre of gravity and no protection device, once the accident happens, we can not find an effective solution. 4. Bad maintenance of equipment Bridge girder launcher is of large-sized and complicated equipment with many operation procedures. Some key position breaks down or some critical process is operated incorrectly, which can cause overturn accident. For example: because of a bad maintenance of a bridge girder launcher,No.2 brake breaks down at work which leads to a crash between No.2 transporter and main engine, then the main engine derails immediately, cause a big trouble. The accident of bridge girder launcher threaten people's lives and property safety, so ZZHZ will learn the lesson, follow the standard instruction to decline the accident rate to the smallest.
What type of bridge is the golden state bridge a i beam girder or a box girder?
beam girder
How is the girder bridge built?
A girder bridge is built by placing girders on bridge abutments and foundation piers. Girder bridges can carry pedestrians, automobiles, trucks, light rail, and heavy rail.
Is the Banpo Bridge a beam bridge?
The Banpo Bridge is a girder bridge.
What type of bridge is th banpo bridge?
The Banpo Bridge is a Girder Bridge.
Where would you find a truss-girder bridge?
Names of famous trus-girder bridges
What type of bridge is a namihaya bridge?
The superstructure is steel box girder
What are the advantages and disadvantages of plate girder bridge?
write it properly here
Why does honeycomb girder gantry crane have a potential market?
Zhengzhou Huazhong Construction Machinery Co., Ltd. (ZZHZ). Thanks for asking the question about honeycomb girder on Answers, because it is one of our patents. Honeycomb girder developed for gantry crane and bridge girder launcher by our company -----Zhengzhou Huazhong Constrution Machinery Co., Ltd ( short for ZZHZ ), which is a new type of main girder and has been widely used in crane fields. The reason why increasing people are looking for honeycomb girder type cranes because they are unique and reliable.Brief introduction on honeycomb girder gantry crane and bridge girder launcher are as following.1. Why we called it honeycomb girder?The main girder is honeycomb girder.For honeycomb girder, it means many hexagonal holes which looks like honeycombs in the main girder, with which the air current could pass through the hole when the launcher works high above the ground. Then it greatly reduces wind impact on the gantry crane, so it is quite safe.2. What are Advantages of honeycomb girder?a. compared with truss girder, safer!Steel plate welded with steel plate (honeycomb girder) is safer than point to point welding (truss girder). If there is an occasional bad welding, the honeycomb girder will not be affected too much, while if it happens on truss girder crane, the whole girder may lose stability and cause an accident.b. Compared with box girder, safer!When box girder crane works high above the ground, the heavy wind will have a great impact on it and make it unsafe. While the honeycomb girder launching gantry has reasonable design(honeycomb hole) to reduce wind impact. Besides, it has a light self weight and cost lower.3. Featuresa. quite safeb. high wind-resistance, high stiffness and low deflectionc. light self weightd. flexible legse. unique and reliable pin connection, easy installation and disassemblyf. high quality imported electrical elements are used4. LimitationAt present, if material to be lifted is less than 250t, a honeycomb girder can be used.Generally speaking, with its own characteristics, the new style honeycomb type gantry crane and bridge girder launcher from ZZHZ will be the flavor of the market.Please find more information about honeycomb girder on website of Zhengzhou Huazhong Construction Machinery Co.,Ltd.
How was the london bridge constructed?
London Bridge is a pre-stressed concrete box girder bridge.
What is the longest girder bridge?
new river gorge
