(1). General Overview

HZQ50/150 walking type launching gantry is a new type bridge construction crane developed by ZZHZ to meet the market demand, according to practical working condition in Bangladesh combining successful experience of ZZHZ and other companies, main features of the launching gantry are as follows:

1. Unique honeycomb girder is firstly made by ZZHZ, featuring light self-weight, large load and high wind resistance;

2. New type and reasonable structure, the launching gantry takes construction characteristics of modern bridges into account, use CAXA to design the model, so it has a more extensive adaptability;

3. The launching gantry uses ANSYS finite element software to optimize the structure, making the bridge girder launcher has a light weight and high stiffness;

4. Middle support legs do not move on the bridge deck, it is unnecessary to lay longitudinal sliding rails, which reduces the pressure on the bridge deck as well as saves construction cost, thus the bridge girder launcher has a larger adaptability to the box type precast girder.

5. The launching gantry uses support legs to move forward by itself, so it can better adapt to longitudinal and lateral slope in the actual working condition as well as make the bridge deck bear safer and more reasonable force;

6. Front support legs and middle support legs can be adjusted at random, core plate has adjustable angle, which make the launching gantry better adapt to construct curved bridge and skew bridge; as constructing the skew bridge, the position of front support legs and middle support legs can be changed according to the angle of skew bridge, the machine can construct skew bridge with angle below 45°.

7. Adding transverse moving trolley as the lifting trolley, the complete machine can move transversely to the right place with boundary beam, safe, reliable, simple and fast;

8. Main girder and main connection structures of the complete machine adopt mature pin connection structure, stable, reliable as well as fast assembly and disassembly (striking a pin only needs several minutes).

 

(2). Technical regulation and design standard

1) Road bridge reinforced concrete and prestressed concrete structure design codes                      TB1002.3

2) Crane design standard                            GB3811

3) Crane test standards and procedures                 GB5905

4) Hoisting machinery safety codes                    GB6067

5)Design code for steel structure                     GB50017

6) Technical safety standards for special equipments       TSG Q7002, Q0002

7) General assembly technology requirements            JB/ZQ400.9

8) General technology requirements on weld assembly     JB/ZQ400.3

9) Fasteners mechanical properties                     GB3098

10) Low-voltage apparatus basic standard                GB1497

11) General technical specification for hydraulic system     GB/T3766

 

(3). Main technical parameters

Model                                                  HZQ50/150

Span                                                        50m

Rated lifting capacity                            150t

Applicable gradient                Longitudinal gradient ≤±3%

                                                   Lateral gradient      ≤±4%

Skew bridge angle                                                       0-45

launching gantry longitudinal moving speed          4.6m/min

launching gantry  transverse moving speed             3.31m/min

Trolley longitudinal moving speed                             4.6m/min

Trolley transverse moving speed                               1.6m/min

Lifting  speed                                                                    0.8m/min

Moving way                                                                       walking type

Centre distance between two main girders           5m

Allowable wind force at working                                  ≤6

Power                                                                             about 90kw

Total weight                                                                  about 180t