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.

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:

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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.

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As a professional manufacturer and seller of bridge girder launching gantry 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.

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?1. Design technical conditions

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)

	material	Safety factor?n?	pull?press?bend???	Shear force???	Pressure-bearing??cd??
?type load combination	Q235	1.33	177	102	265
	Q345	1.33	259	150	386
?type load combination	Q235	1.15	205	118	308
	Q345	1.15	300	173	450

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;

 

Lay rails of the bridge girder launcher (suggest P43 or P43 rails above)

1. Lateral sliding rail layout

2. It is unnecessary to lay longitudinal sliding rail for the bridge girder launcher, it is needed to lay lateral sliding rails for front and middle support legs, sleeper layout should be stable and reliable, use spike to fix outside rail on the sleeper, inside use spikes to buckle symmetrically with edges of two rails; cushion block is used between rail connections, outside is connected by rail splint and long bolt.

3. Lay trolley rail on the bridge girder launcher

4. Rails are directly fixed on the main longitudinal girder, rail connections are connected firmly by rail splint, set up limit switch and rail stop iron at both ends of rail.

5. Rail layout above demands smooth rail joint, correct rail distance, solid support. Distance and size should be strictly controlled to be paralleled between two lateral rails (front, middle support legs) (see table below)

Table??????? Rail Layout Requirements

 

(1). Main technical parameters

Model HZQ30/80
Span （m） 30
Lifting capacity（T） 80
Total weight（T） about 105
Main girder honeycomb girder
Min curve radius（m） ≥400
Max allowable gradient（%）
longitudinal gradient≤±3%，
transverse gradient≤±4%
central distance between two girders（m） 7.0
lifting speed （m/min） 1.0
launcher longitudinal moving speed（m/min） 4.6
launcher transverse moving speed（m/min） 3.0
trolley longitudinal moving speed（m/min） 4.6
trolley transverse moving speed（m/min） 1.7
power（KW） about 75

(2). Configuration for HZQ30/80 bridge girder launcher (1 set)

item specification origin quantity remark
main girder: Steel structure ZZHZ 2 parts One side girder about 50m
Front support： Steel structure ZZHZ 1 set
Middle support： Steel structure ZZHZ 1 set
Rear bracket： Steel structure ZZHZ 1 set
Rear support： Steel structure ZZHZ 1 set
trolley： Steel structure ZZHZ 2 sets 40t×2=80t
Downstroke reducer of front support： XLED63-2.2KW China 2 sets Tapered spline brake
Downstroke reducer of middle support： XLED63-2.2KW China 2 sets Tapered spline brake
Lifting reducer： ZQ500-11KW China 2 sets Tapered spline brake
Longitudinal movement reducer of trolley： XLED63-2.2KW China 4 sets Tapered spline brake
Transverse movement reducer of trolley： XLED63-0.5KW China 4 sets Tapered spline brake
Driving hang reducer of support leg： GKF37- Y0.8-4P China 4 sets Tapered spline brake
Roller walking reducer： XLED63-2.2KW China 4 sets Tapered spline brake
Hydraulic station： ZZHZ 2 sets
Hydro-cylinder of front support： HSGK160-750 China 2 units With hydraulic lock
Hydro-cylinder of rear bracket： HSGK200-600 China 2 units With hydraulic lock
Electric element： Schneider 1 set

(3). About after-sales service

1.Quotation: USD 175,000 per set FOB Tianjin
2.Terms of payment: T/T, L/C
3.Quality warranty : 1 year quality warranty
4. Installation and commissioning
Our responsibility: We will send two technicians to guide you how to install and commission the bridge girder launcher, and they also help train your staff with free charges.
Your responsibility: you are responsible for their food and accommodation, salary and round trip tickets.
5.Time arrangement:Lead time: 65 days

HZQ59/80 bridge girder launching gantry  is of non-standard equipment in worksite, some temporary works should be done in worksite in service process, which is important. Pier cap fixed block and lateral moving plan satisfy demands of the first site. In the later use, construction companies should make corresponding pier cap fixed block and lateral moving plans according to practical situation of bridge and pier caps. It demands the pier cap fixers must be stable and reliable, and piers plan can meet the demand of crossing piers for the bridge girder launcher.

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(1) Brief  introduction

Scope of application and purpose

1. can bridge full span box-type prestressed concrete girder for double track special railway passenger line with straight line, curve line(radius >2500m),longitudinal gradient 20‰,32m,24m,20m equal span or changing span
2. erect bridge girder at the beginning and at the end
3. cross one pier to another pier by automatic shifting
4. two ways to shift between bridges: carried by girder transporter and automatic transfer

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(1) Installation and test run

The bridge girder launcher is of heavy bridge construction equipment, to ensure its normal work, it is necessary to operate the machine in accordance with operation instruction manual and current related rules.

● Install the bridge girder launcher

A. Personnel and equipment

a. personnel: 8-10

As a large-sized special equipment for constructing a bridge, only with clear, definite division of labor and uniform command, only with full-time operator, full-time electrician, full-time safety inspector, the bridge girder launcher can work normally. To ensure construction safety, there must have strict construction organization and measures. The basic personnel conditions are as follows:

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