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Nguyen Duy Manh

UNIVERSITY OF TRANSPORT AND COMMUNICATIONS

DEPARTMENT OF CIVIL ENGINEERING

Division of Urban Transport and coastal engineering

ENGINEERING PRACTICE REPORT

Name: Nguyen duy Manh

Code of student : 1221051

Class: Vietnam – Japan urban transport engineering K53

Nguyen Duy Manh

TABLE OF CONTENT:

I, The Journey for The Practice.

First Day : (1/4/2015)

To learn about safety of site and searching theory……………………………..

Second Day : (2/4/2015)

1. Visit Cau Giay interchange……………………………………….

2. Visit Buoi – Hoang Quoc Viet interchange……………………

3. Visit Nhat Tan Bridge interchange…………………………….

4. Visit new Highway 5 interchange…………………………….

5. Visit Dong Tru Bridge…………………………………………

6. Visit Overbridge of Thanh Tri bridge ’s segment……………

Third Day : (3/4/2015)

1. Visit Highway 2 interchange………………………………..

2. Visit Viet Tri Bridge…………………………………………

3. Visit colecter way, trench, underpass on the Lang Hoa Lac

Freeway……………………………………………………….

Fourth Day : (4/4/2015)

1. Visit the Walk Trench under Nga Tu So interchange……….

II, Technology in building bridge……………………………………..

III, Summarizing after engineering practice………………………...

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Detail report:

First Day : (1/4/2015).

Students have to learn about safety of contrucsion before going and visiting

direcly on the site by Dr Dao Duy Lam. The lession was useful and essential for

student because it help student easy to understand and imagine the base

principle of safety and working on the site. Moreover, Providing the information

about secure epuiment such as hat, clothes, gloves, shoes…

Second Day : (2/4/2015)

- Cau Giay interchange:

This bridge is reinfocered concrete bridge with 7 continuous spans was built

casted in place concrete method on the scaffold system. To reduce stress for the

ground, the contructor used reinforced concrete plate to support for scaffold.

The bridge has seven couple piers and two abutment with two main spans were

used fix bearing support, other maining used elastomeric bearings (steel core

rubber bearings). During building, at the pier using temporary bearings like fix

bearings for stability.

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The formwork for casting the girder.

Summary:

Type of bridge : reinforced concrete bridge.

Type of structure: continuous hollow slab girder.

Type of foundation: bored pile.

Buiding method: casted in place concrete on formwork and scaffolding systems

combined prestressed steel after casting.

Contructor : Dragons Company.

One abutment and scaffolding system.

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2.Visit Buoi – Hoang Quoc Viet interchange

The bridge is reinforced concrete bridge with mutiple spans was built casted in

place concrete method on the scaffold system. To reduce stress for the ground,

the contructor used reinforced concrete plate to support for scaffold. Prestressed

steel after casting step by step. This bridge used some of bearings support

differently such as fix bearings, elastomeric bearings, pot bearings… it is

depend on working state of bridge.

Under the bridge.

The bridge is located on ring road 2 of Ha Noi capital and builded by 12 Bridge

Contractor , CIENCO 1 Company. That bridge is similar to Cau Giay

interchange about structure and building method.

Type of bridge : reinforced concrete bridge.

Type of structure: continuous hollow slab girder.

Type of foundation: bored pile.

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Buiding method: casted in place concrete on formwork and scaffolding systems

combined prestressed steel after casting.

The expansion joint between abutment and girder.

Pot bearings.

This is one in type of bearing are used for that bridge.

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The worker is making a steel cage and positioning member before pouring

concrete

.

Anchor blook and duct for prestressing steel.

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Steel for central median will make by method of assembling the casted in place

concrete plates together.

3.Visit the clover leaf interchange near Nhat Tan Bridge on new Highway 5

Next station is clover leaf interchange on new highway 5 . We went up the

walking bridge near the junction and the teacher introduced about characteristic of

type’s intersection and showed the way to go from some point to different point .

After visiting that point, I recongized some thing like that :

This intersection is shaped asterick.

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- about advantage :

Its advantages are not creating conflict traffic, large sight distance for driver. It

can be planted tree along roadsides making aesthetic. There are suitable

condition for creating a special point of the road segment.

- about disadvantage :.

Features of this intersection is easy to confuse the road for driver and turn right

so long (if you want to turn left,then turn right before).Large area for

interchange, cost of construction and clearance site is quite big .This kind of

interchange has two bridges crossing the road, the continuous beams. That kind

of interchange not suitable for central of city because its area is large so its just

for suburban.

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4.Visit underpass on interchange of highway.

Using back fill behind to reinforce for abutment.

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Retaining wall to hold the soil and clearance the road.

5. Visit Dong Tru Bridge.

Dong Tru bridge is impotant bridge located on highway 5 , this bridge is focal

point of highway 5 with total length is 1140m and crossing Duong river to link

Dong Anh and Long Bien. Beside, reducing trffic volume for some province to

Ha Noi such as Hai Phong, Quang Ninh… and back again.

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Dong Tru Bridge has three main spans with total length approximate 500 meter ,

its width is 55 meter.

This is the first bridge used new technology in Viet Nam at that time. It is steel pile

filled with concrete.

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This structure have some advantage comparing with nomal structure. For

example: stability and durability of concrete – steel pile more higher. Because

inside the steel pile was filled full of concrete so it was protected well inside .

The steel pile don’t rust inside, so it is stable and strong during working time or

even have a hitting by verhicle.

Displacement ,deformation and creep fllow longitudinal and lateral is lower

because stell pile like a ahell to cover tightly. Therefore, the concrete inside

steel pile less destructived than nomal reinforced concrete.

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6.Visit Overbridge of Thanh Tri bridge ’s segment.

The last station in that day is overbride of Thanh Tri bridge’s segment. This is

reinforced concrete bridge.

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The girder was built by casted in place method on scaffold – formwork system.

Althought the height of pier is tall but the contractor still using casted in place

method with hollow slab girder combined prestressing cable after pouring the

concrete.

The steel cage is lowered on the site for peparing to pour concrete (bored pile).

Third Day : (3/4/2015)

1.Visit Highway 2 interchange

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This interchange linking Ha Noi – Noi Bai with Phuc Yen and National Highway

14. There are two bridge crossing national highway 2 and specialy, both of bridge

using pre-baem structure for main sapan. Kind of structure have used only this

bridge in Viet Nam up to now.

The drainage system of the bridge.

This bridge was used pre-beam structure for main span and I beam for other

maining spans. Pre- Beam is special beam because its structure have I steel

member inside and covering by concrete.

I saw main span which used pre-beam structure, depth of beam is lower than I

beam structure and having more beam than orther spans.

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Pre – beam structure for main spans.

2.Visit Viet Tri Bridge

Viet Tri bridge is project include main bridge that crossing Lo river , rail overpass

and approach bridge. The contractor is CIENCO 1 Company.

This project located on national highway 2 .

The supervision consultants for the bridge is TEDI company.

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Main Bridge is reinforced concrete with three spans . its structure is box girder,

method of building was used cantilever technology and moverble casting.

This technology applied a few years ago in Viet Nam and nowadays cantilever

technology had controlled by big building company as CIENCO 1... We don’t

depend on forein building company.

The middle span is waiting for closer joint day of building. I think the building

progess ’s project are on time.

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Picture of general view .

At that moment, the next approach bridge was craning and assembling the beam.

This type of beam is supper -T beam with its long is 38m.

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The appoach bridge and the railway overpass bridge are used Supper T beam and

craning – assembling deam method. This method have many advantage such as:

save money, save time because produced and contructed simultaneously.

Continuous slab deck.

Steel net between two spans. After pouring concrete, It called continuous heat

slab. This slab hold stably for deck of bridge.

End of beam before and after was coved concrete to protect anchorage block.

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Here is casting beam area.

The casting beam is located about 600m to bridge. End of beam have a lot of steel

bar. Its funtion is conect horizontally all of beam. To increse roughness for

conection, they made scabrous surface area linking.

This is expansion joint member to assemble expansion jiont and the

transition slab below.

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The left side is pre-stressing jack for post-tentioning .

The right side is pre-stressing bed for pre-tentioning.

PC bar .

PC bar is high strength steel . This member keeping stable the box girder and the

pier during building time. Because at that point, it have negative moment.

Therefore the box girder easy to overturn down. To resistant that moment, need to

use pc bar to connect girder and pier togerther.

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This is movable casting.

Moverble casting is epuiment for casting by stage in cantilever technology.

The Railway overpass is used stopper block for the beam. It is special member.

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This is special pier with big footing because lacking of railway and building on the

trench.

3.Visit colecter way, trench ,railway underpass on the Lang Hoa Lac Freeway.

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The Railroad underpass on free way.

The expansion joint and light system inside the underpass.

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The interchange on free way with hollow slab girder which used fix bearing for

some middle of span and movable bearing for side spans.

II, Technology in building bridge.

During fieldwork time, I have seen a lot of impression about building technologies

on the site. There are construction technology of bored pile, cantilever girder,pre

beam,super T ... I’m interested in the Super-T girders technology.

Super-T girders is the modern prestressed concrete girders, hollowed inside,

simple structure. Super-T girders has some important advantages compared to

other types of beam current, which leads to advantages for lower costs and saving

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time. Moreover, this method is optimal measure for producing amount of beam

with large number.

Here is casting beam ground.

End of beam have a lot of steel bar. Its funtion is conect horizontally all of beam.

To increse roughness for conection, they made scabrous surface area linking.

It is depent on terain or building contruction to decide assemble method.

There are two main method to build. It is move from casting ground to the site by

crane or dedicated verhical.

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The left side is pre-stressing jack for pressing high strength cable after.

The right side is pre-stressing bed for pressing high strength cable before.

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Speed construction is fast because do not need scaffolding for construction of the

deck. Time to assemble supper T beam is fast and esay.

Summary advantages of Super-T beam.

- Saving cost,saving time for the project

- Istalling,producting easier and more synchronous

- Safety in Construction

- Speed construction is fast

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