Cau tao MSS

• PLATFORM & LADDERS• SUSPENSION GALLOW not in simple supported bridges – Accessory equipment-- Rebar cage prefabrication trolley DESCRIPTION OF MSS COMPONENTS... Dywidag suspended type

Steel Design and Construction Engineering

For the kind Attention of : Ministry of Transportation of Vietnam

MOVABLE SCAFFOLDING SYSTEM-MSS

EXCLUSIVE DISTRIBUTOR IN VIET NAM:

EID ENGINEERING COMPANY Head Office : Block 505, 5th Floor - Tranco Building - Hoan Kiem Ha noi Viet Nam Telephone : 04 9422176 / 9423265/ 0913248854 - Fax : 04 9422175 - Email : eid@fpt.vn

MSS IN BRIDGE CONSTRUCTION

OVERVIEW OF MSS

– AUTOMATIZED CONSTRUCTION METHOD COMBINING A

SUPPORT SYSTEM AND FORMWORK

– SUITABLE CONDITIONS FOR USING MSS

• CONTINUOUS GIRDER SYSTEM

• SIMPLE SUPPORTED SYSTEM

– SINGLE AND MULTIPLE CELLED BOX GIRDERS – DOUBLE T GIRDERS

– PLATE GIRDERS

TYPE OF MSS

• UNDER LANE SYSTEM

• OVER LANE SYSTEM

– SINGLE SPAN MSS (MSS)

– DOUBLE SPAN MSS (DMSS) – TRIPLE SPAN MSS (TMSS)

UNDERSLUNG MSS

A) INTERNAL FORMWORK B) EXTERNAL FORMWORK C) MAIN GIRDER

D) LAUNCHING WAGON E) PIER BRACKET

G) SUSPENSION GALLOWS

OVERHEAD MSS

A) MAIN GIRDER B) FRONT PIER SUPPORT C) TRANSVERSE GIRDER

DOUBLE T OVERHEAD MSS

DOUBLE T UNDERSLUNG MSS

SINGLE BOX UNDERSLUNG MSS

DOUBLE BOX UNDERSLUNG MSS

SINGLE BOX UNDERSLUNG MSS

DOUBLE BOX OVERHEAD MSS

DOUBLE BOX OVERHEAD MSS

MSS DESIGN CRITERIA

– Basic data required for MSS design

– Max distance between bridge piers 70 M– Min radius of curvature > 260 M– Unit weight of superstructure 21.4 Ton/M– Max longitudinal slope 5.0 %– Max transverse slope + /- 5.0 %– Max deflection 1/400

• PLATFORM & LADDERS

• SUSPENSION GALLOW (not in simple supported bridges)

– Accessory equipment Rebar cage

prefabrication trolley

DESCRIPTION OF MSS COMPONENTS

Main Girder Underslung MSS﹝ ﹞

Main Girder Underslung MSS﹝ ﹞

Main Girder, Nose Overhead MSS﹝ ﹞

– Nine main parts of MSS

NOSE

NOSE

NOSE

NOSE

Nose rear﹝ ﹞

Nose and work platform

– Nine main parts of MSS

SUPPORTING BRACKET

Dywidag suspended type Supporting Bracket

Dywidag suspended type Supporting Bracket

Steel suspended type Supporting Bracket

Overlane MSS Supporting Bracket

Overlane MSS and Supporting Bracket

– Nine main parts of MSS

TRANSVERSE BEAMS

TRANSVERSE BEAMS and adjustment device (Underlane MSS)

Supports in substitute of Transverse Beams

Transverse Beams (Overlane MSS)

Transverse Beams (Overlane MSS)

Transverse Beams (Overlane MSS)

– Nine main parts of MSS

EXTERNAL FORMWORK

TRANSVERSE BEAMS

EXTERNAL FORMWORK

External Formwork during launching﹝ ﹞

EXTERNAL FORMWORK

External Formwork and adjustable supports

External Formwork and adjustable supports

External Formwork, adjustable supports and ajustment device

External Formwork foldable﹝ ﹞

External Formwork and suspending Dywidag bars (Overlane MSS)

– Nine main parts of MSS

INTERNAL FORMWORK

INTERNAL FORMWORK

INTERNAL FORMWORK during launching﹝ ﹞

INTERNAL FORMWORK during launching﹝ ﹞

INTERNAL FORMWORK during launching﹝ ﹞

INTERNAL FORMWORK and rolling wagon

Internal Formwork rolling wagon (for double celled box girder)

INTERNAL FORMWORK and support system

Internal Formwork rolling wagon

– Nine main parts of MSS

LAUNCHING WAGON

LAUNCHING WAGON (arrival of Nose)

LAUNCHING WAGON hydraulic motor launching system

Launching Wagon with hydraulic cylinder launching system

Launching Wagon with rolling wheels

Hydraulic motor launching system (assembling & testing in workshop)

Launching Wagon with rolling wheels

– Nine main parts of MSS

PLATFORM & LADDERS

Platform and Ladders painted blue﹝ ﹞

Walkway and working platform on Nose painted blue﹝ ﹞

Working platform on front Nose and ladder

– Nine main parts of MSS

SUSPENSION GALLOW

SUSPENSION GALLOWS

– MSS accessory equipment

•Rebar cage prefabrication

trolley

REBAR CAGE TROLLY

REBAR CAGE TROLLY (during launching)

REBAR CAGE TROLLY (during launching)

REBAR CAGE TROLLY (during launching)

REBAR CAGE TROLLY (lowering into the formwork)

REBAR CAGE TROLLY (over wedge plate)

REBAR CAGE TROLLY (lowering into the formwork)

REBAR CAGE TROLLY (lowering into the formwork)

REBAR CAGE TROLLY’s accessory lifting frame

Equipment requirements

• MSS assembly and general operation

Jack for prestressing Dywidag bars : 1 set

» concrete finisher (optional)

» steam curing equipment (optional)

» prestressing jacks

» strand pushing machine

» grouting machine

Front Supporting Brackets

Releasing of forms (Underlane MSS)

Releasing of forms (Overlane MSS)

Formwork launched transversally outwards

MSS being launched to the next Supporting Bracket

Joining Transverse Beams and External Formwork

Tying bottom & web slab rebars and fixing pretressing tendon ducts

Prefabricated bottom & web slab rebars

Installation of pot bearings on pier top and fixing of forms

Releasing of forms from finished box girder

Rolling wagon carrying Internal Formwork elements to the front

Fixing of Internal Formwork supporting system

Tying of top slab rebars and preparing for concreting

Placement of concrete

Prestressing works carried out from working platform on front Nose

S ummary and  C onclusions

Clean Design Experienced Construction Team

Successful Bridge Projects

Good Construction Specifications

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