Nghiên cứu phương pháp thiết kế và thành lập lưới khống chế thi công các công trình giao thông dạng tuyến

Presentation
Organizational method and constructing techniques
Project: Upgrade and improvement of Road 39-2 (Trieu Duong –
Diem Dien segment)
Package nip/cp-14a (km64+000.00 -:- Km74+432.00)
Item: Manufacturing precast elements (culverts and
culvert head) and installing culverts
Owner: Management board of Project 02 – pmu 02
Designing
consultant:
Smec
Contractor: Joint-venture contractor: songhong – Trico – Thanh
Nam
Content
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Part 1
Constructing method and basic technical solutions
1. Foundation to develop constructing method .....4…… … … … … …
2. Introduction to constructing work items 4…… … … … … … … … …
2.1.Introduction to items .. 4…… … … … … … … … …… … …… … … … … … … … …
2.2 Work volume .. ..4…… … … … … … … … …… …… … … … … … … … …… … … … … …
2.3 Progress .. ..4…… … … … … … … … …… …… … … … … … …… …… …… … … … … …
3. Temporary works for construction .. ...4…… … … … …… …… … … … …
4. Introduction to machinery and materials for constructing
work items .................................................................................................. ...5……
4.1. Machines for casting culvert head, plate and installing
culvert.................................................................................................. ...5…… … … … …
5. Material .6…… … … … … … … … …… …… … … … … … …… …… …… … … … … … ……
5.1. Steel and iron .6…… … … … … … … … …… …… … … … … … …… …… …… … … …
5.2. Concrete .6…… … … … … … … … …… …… … … … … … …… …… …… … … … … …
5.3. Sand ...7…… … … … … … … … …… …… … … … … … …… …… …… … … … … … ……

5.4. Ballast ..7…… … … … … … … … …… …… … … … … … …… …… …… … … … … … …
5.5.Water .. 7… ……… … …… …… … … … … … …… …… …… … … … … … …… …… … … …
6. Detailed constructing method for culvert head and plate
casting.............................................................................................. ....7…… … … … … …
6.1 Constructing site preparation .7…… … … … … … … … …… …… … … …
6.2. Manpower 7…… … … … … … … … …… …… … … … … … …… …… …… … … … …
6.3. Reinforcing ..7…… … … … … … … … …… …… … … … … … …… …… …… … …
6.4. Forming ...8…… … … … … … … … …… …… … … … … … …… …… …… … … … …
6.5. Concreting ..8…… … … … … … … … …… …… … … … … … …… …… …… … … …

7. Detailed constructing method for on-site culvert installation
7.1 Prepare constructing site ...10…… … … … … … … … …… …… … … … …
7.2 . Ground handling and sand pad layer ..10…… … … … … … … … ……
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7.3 . Culvert transport and installation ..10…… …… … … … … … ……
7.4. Culvert completion .10…… … … … … … … … …… …… … … … … … …… ……
Part 2:
Organizing the management for assuring the works quality
1. Method of quality assurance .11…… … … … … … … … …… …… … … … …
1.1 Input quality control ... .11……………………………………………… ……
1.2 Selection and use of the most appropriate machineries on the work
site ....................................................................................................... ..11…………
1.3 Arrangement of the manpower for execution .11… ……………
1.4 The execution process control ..12………………………………………
2.Management of construction materials ..12………… … … … … … … …
2.1 .General Provisions .12………………………………………………………
2.2. Additives for concrete 12…………………………………………………
2.3. Organization of acceptance ...12…………………………………………
Part3
The labor safety, anti-fire, explosion and environmental

sanitation measures
1. Labor safety: .13…… … … … … … … … …… …… … … … … … …… …… …… … … …
1.1.Safety condition upon commencement. ....13…………………………
1.2.Safety condition during commencement ..13………………………
1.3.Policies for the laborers .13………………………………………………
1.4.Method of improving the labor condition, comforts for daily life
...13……………
2. Safety technique for each construction step: ..14 …… … … … … … …
2.1.Safety in organizing the works plan .14……………………………
2.2.Electrical safety on the works site ...14…………………………
2.3.Safety in using the portable tools ...15……………………………
2.4.Safety in using the motorbikes, construction
machines .................................................................................................. .15…………………
2.5.Safety in welding works 16………………………………………………
2.6.Safety in the formwork, steel reinforcement and concrete works
................................................................................................... ..16… ……………
3. Explosion and fire 17…… … … … … … … … …… …… … … … … … …… …… ……
3.1. Standard, codes for fire, explosion prevention: .17………………
3.2. Fire prevention measures on works site .18…………………………
3.3.Organization of the fire prevention system management apparatus
...................................................................................... 18… …………………
4. Environmental protection: 18…… … … … … … … … …… …… … … … … … ……
4.1. Environmental protection: ..19……………………………………………
4.2.Method of solid waste preservation 19…………………………………
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4.3.Protection of technical infrastructure works and green
trees .................................................................................... 19…………………………
5. Method of safeguards, security, social order: .19…… … … … … …
Part 4
Conclusion and recommendations

Content
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Part 1
Constructing method and basic technical
solutions
1. Foundation to develop constructing method
- Profile of constructing design
- Decree 16/2005 on Investment and Construction Management
- Decree No. 209/2005 on quality management of constructing works
- Technical standards AASHTO and technical regulations of the project
- Work site status and other supply conditions like electricity, water of the area
- Professional capacity of the Contractor and market survey information
2. Introduction to constructing work items
2.1 Introduction to items
Item: Manufacturing precast elements (culverts and culvert head) and installing culverts,
Package NIP/CP-14A: Upgrade and improvement of Road 39-2 (Trieu Duong – Diem Dien
segment)
The item is composed of main works as follows:
+ Constructing BTCT culvert head with the diameter of 1000 mm
+ Constructing precast support for BTCT culvert head with the diameter of 1000 mm
.
2.2 Work volume
Constructing volume is based on tender and constructing design drawings of the project.
2.3 Progress
Starting time: 05/2009
To ensure progress of drainage system as well as common project progress, the contractor arranges
two constructing team to carry out casting parallel structural elements: culvert head casting team and
culvert head detaching culvert team. Basing on progress, contractor shall adjust culvert head suitable
with the practical constructing condition on the site.

The elements to be cast is large and multi-type, and depend on progress in working the road, the
constructor shall adjust casting progress of elements corresponding to common progress of the
package.
3. Temporary works for construction
Site hunts and auxiliary works are constructed on the area of 3000 m
2
including: site hunts for
accommodation, material stock, element casting site, element drying site, water tank for life and
construction, drilling well, other facility to serve life on the project site (See the annex).
Table of temporary works

No.
Refuse Unit Number Note
1 Office Piece 01
2 Worker house Piece 01
3 Material stocks Piece 01
4 Element casting site m2 1500
5 Element gathering site
6 Other
4. Introduction to machinery and materials for constructing work items
4.1. Machines for casting culvert head, plate and installing culvert
- The contractor shall arrange sufficient machines and equipments to serve the construction and
ensure proposed progress.
- Machinery is gathered to the request and constructing progress corresponding to features and
volume of work items. The contractor shall make plan to avoid negative work construction.
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- Motorbikes serving the construction are always checked, maintained to ensure good operation

Equipments for craft casting work
No. Name Number Manufacturing

country
Year of
manufacturing
1. Self-moving culvert 1 piece Korea 1995
2. Excavator 0.8m3 1 Piece Japan 1995
3. Forced shaker 1 Sets China 2007
4. Mixer 350L 2 Piece China 2007
5. Compactor: 450KW 5 Piece China 2007
6. Power generator 5 KW 1 Piece Japan 2000
7. Electricity welding machine:
150KW
2 Piece Japan 2007
8. Culvert shaping form
- Culvert head D1000
- Culvert plate D1000
20 Sets
20 Sets
Vietnam 2007
9. Metal cutter 02 Piece Japan 2007
10. Concrete casting form 9x2 Sets Vietnam 2005
11. Water pump: 4,5KW 2 Piece Vietnam 2005
12. Subordinate equipments to support reinforce concrete transport to the construction site
13. Measurement like square meter, metric ruler, shrinkage level
14. Method to maintain concrete….
15. Transporting automobile: 8-ton lever, 1.25m3/bowl exacator, 110CV earth mover
5. Material
- All the materials used for the work must ensure all regulations on technical standard
described on approved design, quality certificate issued by manufacturer, sample test
certificate as well as state current regulations and approved by supervising consultant and
owner before construction.

5.1. Steel and iron
-Steel used for the work is of type approved by consultant and owner to ensure quality
according to project technical regulation and subject to AASHTO M31 (ASTM A615),
-Steel, before use, must be ensure to be non-rust, oil-free and dirt-free
- Contractor shall take test sample for each steel batch according to AASHTO T68. Steels
must have quality certificate and label as required and ensure resistance to tension, bending
and be approved by consultant.
- Contractor must submit to consultant origin certificate of each product batch transported to
the site including:
+ Manufacturing country
+ Standard governing manufacturing
+ Physico-mechanical and experiment table for each manufactured steel batch.
For each diameter, each steel grade, batch is required to be 20 tons. Each steel batch, as
transported to the site, with sufficient certificates shall be taken 9 rods for testing: 3 sample for
tension, 3 for bending, 3 for welding test
- Steel rods must be stored far from the ground, in-house or with suitable cover.
- Reinforcing must be machined according to AASHTO standard in right shape and dimensions
as specified on the drawings. all the reinforcing must be coolly bent, except for other agreement
5.2. Concrete
- The concretes used for the work are those approved by consultant and owner.
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- The concrete is regularly supplied to the request of work progress with quality certificate for
each manufacturing batch. 3 month old concrete must, before use, be subject to quality test to
ensure fulfillment to ASTMC150 standard (AASHTO M85).
5.3. Sand
- Supply must be clean, dirt-free yellow sand that follows AASHTO M6 requirements. Sand
quality check must be governed by ASTM standard. Sand sample must be submitted to the
Owner and Consultant and only used upon agreement by Consultant.
5.4.Ballast

- Ballast used for the work is carefully selected with the right dimension and design (ASHTO
M80 Standard). Quality check of ballast for concreting must follow ASTM C33.
- Ballast, before use, must be agreed by the Owner and Consultant.
5.5. Water.
- The contractor shall drill well and pump water to the tank, filter. Water for construction must
be tested to ensure specification and agreement by the Consultant.
6. Detailed constructing method for culvert head and plate casting
6.1 Constructing site preparation
- Arrange constructing site near the site
- Use earth mover combined with manual earth leveling to create constructing site
- Build site huts for workers and technical officers, yards, material and machinery stocks
- Gather materials and equipments on the site
6.2. Manpower
- Workers are arranged into 2 teams of 15 people/each
- Direct constructing workers: 15 worker/team
+Framework worker: 02 workers/team
+ Rigger: 02 workers/team
+ Iron worker: 04 workers/team
+ Wielding worker: 01 worker/team
+Other: 06/team
6.3. Reinforcing
Reinforcing is machined corresponding to ASSHTO Standard and Project Technical
regulation
+ Preparation: Ensure that the steel is clean, rust-free, dirt-free and oil-free. Before
machining, it is required to check the diameter and type of steel
+ Cutting: Basing on the approved drawings, each steel type shall be cut by cutter to ensure
sufficient volume
+ Bending: Steel shall be bent in the right shape and dimensions specified on the design
drawing. Machined steel must be bound in bundle with code and elements
+ Installation: steel is transported to the constructing site in right volume described on the

drawings. Along steel stick is grout-cast wedge with the thickness equal to that of protecting
concrete layer as designed.
+ Fixing: Steel is fixed, connected and linked together by binding or wielding according to
design.
+ Testing: The contractor is responsible to show certificates to demonstrate steel quality; and
at any time of doubt for steel quality, tested sampling is required.
- Acceptance check of reinforcing:
+Before constructing concrete, it is required to make acceptance check minute including:
Consultant and technician officer of contractor
+ Before concreting, it is required to inform Consultant 12 hours in advance for carrying
out acceptance check of reinforcing and issuing approval for construction.
6.4 Forming
Form: Form must be accurately constructed in the right shape described in the drawing to
ensure stability and resistance to deformation as concreting
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