Step 1:

1. after stretching the box girder, remove scattered formwork and side formwork equipments at top of the pier
2. remove vertical, horizontal connection bolts in the boom, bottom formwork and lateral formwork, remove transverse joint bolts in the formwork
3. hydro-cylinder in the auxiliary support leg stretches out to the bridge, cylinder in the rear support leg takes back and moves forward to a certain place, hanging in the air
4. support cylinders in the auxiliary support leg and front support leg take back to make the whole machine fell 0.27m
5. bottom formwork moves transversely to start and be locked temporarily, preparing for moving from one pier to next pier first time

MZ900S upstroke movable support system bridge making machine

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During the process to install precast concrete box girder for bridge girder launcher, there exists a lot of dangers. Only solve them, we can smoothly finish erecting the bridge and ensure the life and property safety of our employees.

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HZQ32-165t bridge girder launcher

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The launching gantry belongs to heavy-duty machinery equipment, a small mistake can cause serious accident. Therefore , the operator must operate the machine seriously according to the safe operating rules. ZZHZ has very rich experience of producing bridge girder launching gantry, therefore, it tells us what are dangerous operations:

1)?lifting goods without supervising (precast box girder and guiding girder etc.)
2)?the bridge girder launching gantry lifts persons
3)?the person who operates? launching crane without license
4)?lift goods which is heavier than rated lifting capacity or the goods with unsure weight
5)?lift unbalanced load, or the goods are bound on the earth.
6)?Swing the load or lifting tools when the machine is traveling longitudinaly.
7)?The lifting tools are used as support for load.
8)?The steel rope is used as lifting rope for load
9)?The steel rope is used as grounding line when it is welded.

launching gantry

(1)Advantages

1. Honeycomb-girder (patented product) is first-made by Huazhong which enjoys a good fame in industry inside and outside

2. Light self-weight, large load, high wind-resistance and high rigidity, low deflection, so it is quite safe

3. Flexible legs, easy to transfer to another site

4. Reliable and unique pin connection, short-time installation

5. Imported and high-quality electronic components also ensure the safety of hand operation

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(1) General arrangements

1.Motor of HZY900 girder transporter is placed in rear part, frame girder in middle parts with 2 columns 16 axis, 2 wheels for each wheel set, 64 wheels in total;

HZY900T Girder Carrier

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(1) Introduction

.Product name : HZY 900 girder transporter

Product model: HZY900

HZY—girder transporter series of ZZHZ(Zhengzhou Huazhong Construction Machinery Co., Ltd)

900—rated lifting capacity 900t

C—stands for engineering vehicles

1—26.5R25 tyre series

HZY900T girder transporter

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ZZHZ logo

Zhengzhou Huazhong Construction Machinery Co.?Ltd(ZZHZ) lies in Shangjie district of Zhengzhou city, Henan Province, China, Which enjoys convenient transportation and superior geography position. It was established Nov., 1992. Up to now, it has become a united running production corporation of China?s Construction Machinery Co., Ltd.
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?1. Design technical conditions

launching gantry

Rated lifting capacity????????????? 160t

Utilization grade????????????????? U5

Load condition??????????????????? Q2

Complete machine working level??????? A5

Institutions working level????????????? M4

Trolley track gauge?????????????????? 6.0

Trolley lifting speed with full load?????? ?0.9m/min

Trolley moving speed with full load????? ?2.75m/min

Moving speed for the complete machine to cross piers??? ?2.75m/min

Max wind pressure in working condition???? 250N/m²

Max wind pressure in non-working condition ^{??????????????????????}800N/m²

2. Safety factor and admissible casino spiele stress

Take load combination based on present national standard crane design code GB3811-83

Table 1????? material safety factor and admissible stress (MPa)

Note: if thickness of rimmed steel and structural steel > 15mm and thickness of steel plate > 20mm, the admissible stress should be multiplied by 0.95 to be reduced.

3. Allowable static deflection of bridge girder launcher frame [ f ]

Span L= 43m, middle span: [f]?43000/700?61.43mm

Span L= 30m, middle span: [f]?30/700?42.85mm

According to clause 3.8.1.1, crane design code GB3811-83, working level of bridge crane is A5 or below A5, Y_L?L/700;

honeycomb girder

Bridge construction crane produced by ZZHZ accesses to national patent with isosceles triangle honeycomb type main girder, it features light self-weight, high stiffness, low deflection and high wind resistance. The main longitudinal girder keeps load-bearing steel plates at two sides of box girder, removes non-load-bearing steel plates at upper and bottom parts, directly welds two sides steel plates together, replaces U-steel at bottom parts, thus the honeycomb girder structure is designed, it keeps the advantages of box girder and overcomes its shortcoming: too heavy.

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HZP140 segment assembly bridge construction crane is specifically developed by ZZHZ and MBEC of China, featuring installing full span box girder segment, combining with the feature of prestressed concrete beam of Yellow River Bridge in Taohuayu, Henan, China. It is prevailing to use prefabricated segment assembly bridge construction crane to construct elevated highways overseas and in Hong Kong and Macao, but the construction technology above mentioned is firstly adopted in Henan, China.

segmental assembly bridge girder launcher

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