JPX30 balanced cantilever segmental launch gantry for precast bridge construction

JPX30 balanced cantilever segmental launch gantry for precast bridge construction

Summary

Segmental?Launching?Gantry?is?generally?used?in?the?erection?of?the?Highway?Bridge?and?Subway?Bridge,?

using?the?precast?segmental?pre-stress?concrete?box?beam?(PC?beam)?assembly.?The?main?feature?is?the

?high?efficiency?of?construction?and?self-travelling.?Generally?it?is?composed?of?the?main?beam,?

leg?and?winch?trolley,?the?main?girder?is?used?for?bearing,?the?leg?is?to?execute?machine?transverse?moving,

?longitudinal?moving,?leveling,?support,?cross?span,?cross?scale?and?other?functions,?and?the?winch?trolley?

used?for?lifting?the?precast?girder.

Working?Principle

Use?girder?transport?trolley?or?beam?transport?ship?to?feed?girder?(two?beam?feeding?type?as?under-bridge?and?rear?feeding),Segmental?Launching?Gantry?in?turn?lifts?each?segment?girder?and?suspend?

on?the?main?beam?and?then?accurate?contraposition,?gumming?and?pushing?into?the?whole?girder,?

Segmental?Launching?Gantry?unloads?and?places?on?the?bridge?pier,?and?connect?the?adjacent?bridges

?by?wet?seam,?this?completes?the?single?span,?and?then?the?Segmental?Launching?Gantry?self-crosses?to?

the?next?erecting.

Equipment?Type?

According?to?the?assembly?mode?of?the?present?section?beam?design?(mainly?to?see?the?wet?joint?position),

it?can?be?divided?into:

1?Full?symmetry?assembly:

From?the?pier?sides?to?the?bridge?center,?the?wet?joint?is?in?the?middle?of?the?span.?

Side?span?uses?temporary?support?erection?without?using?the?segmental?launching?gantry.?

Generally?it?is?equipped?with?1-2?hoisting?crane.?Full?symmetry?assembly?is?more?special?and?it?

is?generally?used?for?large?span?bridge.

2?Symmetrical?cantilevers?+?half?span?cantilever:

The?design?of?the?bridge?is?that?4-5?piers?as?a?section?of?continuous?beam,

?then?disconnect?the?expansion?joint.?Therefore,?the?segmental?launching?gantry?should?not?only?

have?symmetrical?cantilever?function,?but?also?need?to?have?the?ability?of?half?span?assembly?in

?each?section?of?the?continuous?beam?pendulous.?This?machine?needs?to?prepare?1-2?cranes,?

and?it?is?more?widely?used?in?the?box?girder?bridge?with?large?span.

3?Segmental?Launching?Gantry?of?full?span?cantilever?assembling:

The?wet?joint?and?expansion?joint?are?on?the?piers.?Erect?the?full?span?in?the?middle?of?the?two?adjacent piers.?It?is?used?for?medium?span?bridge,?only?equipped?with?1?set?of?hoisting?crane.

The?specific?way?is?divided?into?high?cantilever?and?low?cantilever.

According?to?the?travelling?system?and?erection?methods,?it?can?be?divided?into?the?upper?bearing?and?the?lower?bearing?type

1.?Upper?type:

Segmental?Launching?Gantry?travels?on?the?upper?deck?(or?at?the?top?of?pier)?,

?segmental?beam?erects?suspending?under?the?main?girder.?It?has?shifting?over?amplitude?function.?

Scope?of?application:?①Totally?symmetric?cantilever?②Symmetrical?cantilever?+?Half?span?cantilever?

③full?span?cantilever?④water?or?obstacles?under?the?bridge

2.?Lower?type:

Segmental?Launching?Gantry?walks?on?the?pier?cap?under?the?bridge?deck,?

segment?beam?erects?on?the?main?girder.?It?does?not?have?the?traversing?over?amplitude?function.

?Scope?of?application:?①full?span?lower?cantilever?project?②lower?pier?③heavy?segmental?beam

Type?Selection?Requirements

Type?selection?design?needs?to?provide?the?bridge?design?drawings?and?other?technical?requirements?of?

Client,?including?bottom?bridge?structure,?upper?girder?design?and?site?working?environment,?the?main?

technique?parameters?needed?to?be?clear:

1.?Maximum?segment?beam?lifting?weight;

2.?Maximum?suspension?weight;

3.?Bridge?span;

4.?Segmental?block?section?size?and?lifting?point?position;

5.?Pier?section?size,?height?and?bending?bearing?capacity;

6.?Deck?longitudinal?slope?and?transverse?slope;

7.?Minimum?curve;

8.?Type?of?beam?feeding.

Basic?Info.

Model?NO.:JPX30?

Type:?Segmental?Launching?Gantry?

Sling?Type:?Wire?Rope

Power?Source:?Electric?

Certification:?ISO9001:?2000?

Export?Markets:?Global

Feature:?
(1)?Reasonable?structure
(2)?Favorable?performance
(3)?Smooth?starting?and?stopping
(4)?Safe?and?reliable?traveling
(5)?Low?noise,?commodious?cabin?and?wide?view
(6)?Convenient?maintenance,?exchangeable?parts?
(7)?Saves?electricity?

Safety?feature:?
(1)?Weight?overload?protection?device
(2)?Lifting?height?limit?device
(3)?Low?Voltage?protection?function
(4)?Phase?sequence?protection?function
(5)?Emergency?stop?function

Con