The Cantilever Form Traveller
Cantilever Form Traveler is the main equipment in the cantilever construction, which can be divided into truss type, cable-stayed type, steel type and mixed type according to the structure. According to concrete cantilever construction process requirements and design drawings of Form Traveler,compare the various form of Form Traveler characteristics,weight, the type of steel , construction technology etc., Cradle design principles: light weight, simple structure,strong and stable, easy assembly and dis-assembly forward , strong re-usability ,the force after deformation characteristics, and plenty of space under the Form Traveler , large construction jobs surface, conducive to steel formwork construction operations.
Lianggong Formwork design and manufacture of Form Traveler products , consisting mainly of part at the bottom of the main truss system, a bearing support system ,walking and anchorage system, suspension lifting system, formwork and scaffold system .
Lianggong Formwork in a diamond structure Form Traveler main products, its products through three generations of innovation:BY-1 bolt type Form Traveler structure；BY-2 screw connection type Form Traveler structure ;BY-3 Plug-pin connection type hydraulic walking Form Traveler structure.
The Form Traveller can be customized to meet clients’ requirements and designed to comply with international codes . The equipment is self launching with back launching option for dismantling .
The Cantilever Form Traveler Load design
(1) Load factor
According to highway bridge design and construction specification issued by the Ministry of Transportation, the load coefficient are as following :
The overload coefficient of expansion mode and other factors when the box girder concrete is poured :1.05;
Dynamic coefficient of pouring concrete :1.2
Impact factor of Form Traveler Moving with no load:1.3;
Stability coefficient of resistance to overturning when pouring concrete and Form Traveler:2.0;
The safety factor for the normal use of the Form Traveler is 1.2.
(2) Load on the main truss of the Form Traveler
The Box girder load:Box girder load to take the most massive calculation, the weight is 411.3 tons.
Construction equipment and crowd load:2.5kPa;
Load caused by dumping and vibrating of concrete:4kpa;
(3) Load combination
Load combination of stiffness and strength checking :Concrete weight+Form Traveler weight+construction equipment+crowd load +vibration force when the basket moves: the weight of the Form Traveler+the impact load(0.3*the weight of the Form Traveler)+the wind load.
Refer to technical specification for construction of highway bridges and culverts provisions:
(1) The weight control of the Form Traveler is between 0.3 and 0.5 times of the concrete weight of th pouring concrete.
(2) Maximum allowable deformation (including the sum of sling deformation):20mm
(3) Safety factor of anti overturning during construction or moving :2.5
(4) Safety factor of self anchored system:2
Introduction to the overall structure of the Form Traveler
Form Traveler products designed by Lianggong formwork, its main components are:
1. Main Truss System
The main truss system mainly includes:
Upper chord,bottom chord ,anterior oblique rod posterior oblique rod , a vertical rod , doorframe etc.
2. Bearing bottom supporting system
The bottom bracket bearing system mainly comprises bottom system, front support beam, rear support beam, oist hangers etc.
3. Formwork and support system
The formwork and support system are the main components of the Form traveler
4. Waling and anchor system
Walking and anchoring system mainly comprises
Rear anchor , Buckle wheel fixed , walking track, steel pillow , walking attachment etc.
5. Suspension lifting system
Project example of suspension lifting system
The connection of the upper and lower hangers.