In accordance with the various shapes of girder, heavy lifting capacity and high precision of erection of the passenger dedicated railway, the HZQ550t launching gantry designed by our company can be applied to the double parallel lines, single line, changing spans and curved erection. It enjoys the following characteristics.
Firstly,good stability of hoisting of the girder:two trolleys cooperate with each other in three-dimensional motion with the girder, meeting the requirements of the girder erection.The hoisting beam body adopts the method of lifting in four points of the object with three points in balance, the beam body bearing stress in good state.
Secondly,Low height of the whole crane: the hoist withdraws and then keeps away from the trolley,efficiently reducing the height of the crane;
Thirdly, high efficiency of operation:the processes of beam supporting and transporting are separated to increase the efficiency of operation;
Fourthly, simple leg: the flexible front leg and the rigid back O leg support the main girder, making the stress bearing more clear;
Fifthly, convenience of span adjusting: the subsidiary leg and the front leg help each other to meet the needs of the span adjusting of the launching gantry;
Sixth, easy operation: the exclusive driver’s cab and operating devices of wireless remote control are set up, especially the remote control supervising the field with a good view, easy operation, safety and reliability.
Seventh, horizontal trimming function of the girder: the error of the counterpoint is not more than 2mm.
Eighth, stability and reliability: the hoisting device is equipped with video and monitoring alarms,emergency brake, lower and upper limit’ switch,overload protection device,the double braking of hoist and wind measurement device of working environment,etc.

1.Introduction

THQ bridge girder launcher for tunnels is a kind of new high-speed rail bridging machine to address the problems of many tunnel in the construction of high-speed rail. The whole machine can go through the tunnel carried by the beam-conveying vehicle, not only saving the cost for disassembly and installation of bridge erecting and transport, but also ensuring the construction safety. It can be applied to the bridge erecting in the construction field continually.

2.Features

It can be used for the construction between the bridge and the tunnel, saving the cost for disassembly and installation and improving the efficiency.

The guide beam and the bridge girder launcher direct each other to vertically pierce the hole;easy operation, safety and reliability.

Analysis of the Reason of Launching Gantry Accident

     With the development of railway construction, the use of launching gantry for railway is increasingly frequent, as a result of which, the overturning accident of launching gantry for railway happens a lot, causing the destruction of machinery and the death of people. Once the accidents happened, the repair of the launching gantry takes a long time and much money; also, the accidents impact the progress of launching gantry as well as the railway construction. The reasons of launching gantry accidents can be concluded as follows:

1. human error

    Some staff of the construction companies are of low quality and not responsible, even poor in technology. In addition, some unit leaders are not strict with the implementing of the institution, fail to guide correctly and manufacture product without referring to the normal standard.

2. Subgrade and line

    The low quality of subgrade and line are the main reasons of launching gantry overturning. There are more or less hidden troubles of the subgrade. And the quality of the line is too low. For example, if the line slope is not even causing the launching gantry skidding and thus overturning.

3. The launching gantry itself

    The launching gantry needs to find its proper place through the one end of the bridge with lifting the bridge girder. When it travels, its high center of gravity is easy to causing its overturning. The launching gantry currently used has a long body, heavy weight and high center of gravity.

4. Lacking proper maintenance

The launching gantry belongs to the large equipment and has lots of process, each of which may cause the overturning of the launching gantry. If the launching gantry is not properly maintained, even a small part may bring in serious consequence.

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1. Long-term overeating
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The Ceremony of The First Erection of HZQ900 Bridge-erecting Crane
On November 9, 2006, the ceremony of the first erection of HZQ900 bridge-erection crane held by Wuhan Railway Bureau took placed in Wuhan Tianxingzhou Bridge. The Chief of technical supervision bureau of Hubei province, vice mayor of Wuhan Railway Bureau and leaders of each Engineering Bureau of Railway were invited to visit the field.
At 9 a.m., the director of China Railway No.7 Engineering Group Co., Ltd delivered a speech. After cutting the ribbon, the bridge girder was to be erected. The concrete precast girder of 900t was placed on the bridge pier of 10 meters in half an hour, which signifies that the construction of passenger special line from Wuchang to Guangzhou entering an entirely new stage. With the erection fished, the field was filled with joy and cheer, which was reported by the central television station, Hubei television station and Wuhan television station etc.

Now I would like to share with you the most boring and exotic work in the world. For example, the helper of panda, caretaker of island and hotel critics, that is to say, people living in hotels and then commenting the service, environment, price, hygiene and catering etc of hotels. With time going by, there are some exotic jobs appearing in our life. Those jobs seems relaxing, interesting and high paid, winning other people’s admiration, envy as well as hate.
Also, according to one report of July 11 on the website odditycentral of America, observing the drying process of paint, which seams the most boring job in the world. However, there indeed exist some people who are interested in it. For 4 months,the 34-year-old Doctor Thomas Curwen spends a few hours observing the paint drying and the color changing. He said this job is meaningful. What’s your opinion?
Launching gantry is one of the key products of Zhengzhou Huazhong Construction Machinery Co., Ltd. The launching gantries including HZQ Series Launching Gantry for Highspeed Railway, HZQ Series Honeycomb Girder Launching Gantry, HZQ Launching Gantry for Highway and Railway, HZQ Series of Launching Gantry Integrating Carrying and Erecting, Upstroke movable support system and Downstroke Movable Support System.The professionally designed launching gantry carefully manufactured by the engineer is of high quality and safety.The purchased components are excellent foreign and domestic brands.The launching gantry is sold both at home and abroad,including these countries in southeast Asia,middle East, south America, Africa, etc., and widely used in the beam field, yard, plant,port etc. The launching gantry enjoys good reputation among customers for the high quality and sound service.

1.Introduction
MGx-box girder gantry crane is the patented product designed for bridge construction. Its structure is the first one worldwide. In accordance with the bridge construction featuring small batches, heavy weight of single object, power supply tension and frequent site moving, Zhengzhou Huazhong Construction Machinery Co.,Ltd strives to attach the following targets,namely simple structure,easy accessibility and operation as well as energy saving.
2.Features
The design of MGx-box girder gantry crane gives top priority to the safety, catering to large-tonnage hoisting and frequent operation.Its features are as follows:
First, adopting the box girder as the main structure intensities the crane’s strength.
Second, the operating scope is enlarged with the two ends owning cantilevers.
Third, high working level, high operating speed and high efficiency.

3.Main Technical Parameters
The cranes produced by our company are designed according to the customer’s requirements.The example of specific type is as follows:
项目Item/数据Data/型号Type MGx20 MGx35 MGx120
起重量(t)
Lifting capacity(t) 20 35 120
净空高(m)
Net height(m) 8 10 20
跨度(m)
Span(m) 26 36 28
悬臂长度 (m)
Cantilever length (m) 3 4 0
大车移动速度 (m/min)
Crane traveling speed(m/min) 20 20 0-15
小车移动速度 (m/min)
Trolley traveling speed(m/min) 0-8 0-15 0-8

Zhengzhou Huazhong Construction Machinery Co.,Ltd produced a series of gantry cranes covering various modes of different sizes,including large girder gantry crane(MGHZ1200,the lifting capacity of 1200t),high-speed rail girder gantry crane,honeycomb beam gantry crane, box girder gantry crane,electric hoist single girder gantry crane,shipbuilding gantry crane,L type gantry crane,rail type container gantry crane,rubber-tyred container gantry crane,etc.The professionally designed gantry crane carefully manufactured by the engineer is of high quality and safety.The purchased components are excellent foreign and domestic brands.The gantry crane is sold both at home and abroad,including these countries in southeast Asia,middle East, south America, Africa, etc., and widely used in the beam field, yard, plant,port etc. The gantry crane enjoys good reputation among customers for the high quality and sound service.
Then, let’s take the bridge girder launcher for high speed railway as an example.
The bridge girder launcher for high speed railway of passenger railwayss is manufactured and developed for the various types of main beam,heavy weight of hook and the high precision of erection,adapting to the changing of tracks and the curve erection. The bridge girder launcher online slots for high speed railway has the following advantages:
Firstly,good stability of hoisting of the girder:two trolleys cooperate with each other in three-dimensional motion with the girder, meeting the requirements of the girder erection.The hoisting beam body adopts the method of lifting in four points of the object with three points in balance, the beam body bearing stress in good state.
Secondly,Low height of the whole crane: the hoist withdraws and then keeps away from the trolley,efficiently reducing the height of the crane;
Thirdly,high efficiency of operation:the processes of beam supporting and transporting are separated to increase the efficiency of operation.

The bridge girder launcher for high speed railway of passenger railwayss is manufactured and developed for the various types of main beam,heavy weight of hook and the high precision of erection,adapting to the changing of tracks and the curve erection. The bridge girder launcher for high speed railway has the following advantages:

Firstly,good stability of hoisting of the girder:two trolleys cooperate with each other in three-dimensional motion with the girder, meeting the requirements of the girder erection.The hoisting beam body adopts the method of lifting in four points of the object with three points in balance, the beam body bearing stress in good state.

Secondly,Low height of the whole crane: the hoist withdraws and then keeps away from the trolley,efficiently reducing the height of the crane;

Thirdly,high efficiency of operation:the processes of beam supporting and transporting are separated to increase the efficiency of operation;

Fourthly,stability and reliability: the hoisting device is equipped with video and monitoring alarms,emergency brake,lower and upper limit’ switch,overload protection device,the double braking of hoist and wind measurement device of working environment,etc.

Fifthly,easy operation: the exclusive driver’s cab and operating devices of wireless remote control are set up, especially the remote control supervising the field with a good view, easy operation, safety and reliability.

熔焊fuse welding

单悬臂门式起重机 gantry crane with cantilever

双悬臂门式起重机gantry crane with cantilevers

手拉葫芦chain hoist

载重小车式龙门起重机gantry crane with crab trolley

气焊gas welding

轨距 gauge distance

轨隙 gauge play

计量杆 gauge stick

吊钩起升速度 hook hoisting speed

吊钩起重量 hook lifting capacity

吊钩作业hook operation

起吊载荷 hook load

吊钩速度 hook speed

空载试验 load test

公称直径 nominal diameter

公称偏差nominal deviation

额定负载nominal load
额定参数nominal parameter

K型支架 K support

横向变形 later deformation

横向载荷 lateral load

侧视图 lateral plan

横断面图 lateral profile

横截面 lateral section 

横向应力 lateral stress

超长货物 length cargo

长度因素length factor

皮软垫 leather gasket

杠杆作用 level action

起重附件 lift accessories

升降臂 lift arm

提升装置 lifting apparatus

卷扬机 winch

主梁 boom

支腿 outrigger

a sedentary lifestyle

安全保护装置 safe and protective devices

安全工作载荷 safe working load

安全界限 dead line/ safe limit

安全开关 protective switch

安全联轴节 safe coupling

安全区 safe area

安全容许载荷 safe allowable load

安全条列 safety rules

安全载荷 safe load

安装应力 erection stress

安装载荷 setting load

半成品 half-finished product

半封闭式驾驶室 semienclosed crab

With two engineers’, Wang Changsong and Shi Changfu ,installation and test for nearly a month, Huazhong Overhead Crane stands in the plant of blue and white.

Totally six overhead cranes are purchased by the customers from Indonesia. And the red and yellow appearance of the overhead crane is designed in accordance with the requirements of customers, which is the first attempt and performs well, attracting people’s attention. All the festivals and joyful occasions adopt the red color to display happiness and good luck from ancient times. The red color exerts strong effect on people’s view and shows the positive spirit and image of one enterprise; and yellow color symbols wealth and brilliance like the sun.

In addition, to meet the customer’s individual satisfaction, based on the climate features of Southeast Asian,the operating system and other systems are designed more locally by Huazhong Construction Machinery Co.,Ltd, providing sound service for customers.Since Huazhong Construction Machinery Co.,Ltd opened up overseas market in 2010, it forges head stably in the overseas market for its details,high-quality products as well as sound after-sale service.