1. Table of contents
1. General.
2. Management Organization Chart
3. Sequence of works.
4. Formwork design.
5. Construction joint treatment.
6. Re bars fabrication & setting.
7. Installation of embed item.
8. Placing of concrete.
9. Compaction of concrete.
10.Removal of formworks
11.Curing
12.Protecting against raining
13.Electricity
14.Equipment & Manpower
Appendix
A. First floor plan
B. Typical formworks & Scaffolding arrangement.
1. General
2. This method statement describes how we carry out the concrete works of column in
building works.
Concrete class shall be approved ready-mix concrete B25 (Grade 35NM/m2)
Please refer to Appendix A for first floor plan of three main building.
2. Management Organization Chart
Mr. N.N.Hai
HSE Manager
Mr. Tran Thanh Minh
Site Engineer
Mr. Hoang Hung
Site Engineer
Sub Contractor Sub Contractor
2.1 Project Manager
Mr. T. UCHIDA
Project Manager
Mr. A . IKEGAMI
Construction
Manager
Mr. A.M. Cabonce
QA/QC Manager
Mr. K.Miyara
Chief Engineer
Mr. P. C. TRUNG
Chief site Engineer
Mr. Dang Trong Dung
Site Engineer
Sub Contractor
· To oversee and control all aspects of the Piling activities, and dictate schedule
requirements
· To ensure that all field staff are fully aware of the requirements of this method
statement, and that these requirements, in all respects, are fully implemented.
· To ensure that Safety and Environmental procedures, particularly, are in place
before activity commences, and strictly complied with, throughout the duration
of concreting works.
3. 2.2 Construction Managers, directly reports to Project Manager.
· To oversee all construction works, with respect to schedule.
· To ensure that all field staff follow the requirements of this method statement,
including quality control and HSE.
2.3 Chief Engineer, reports to Construction Manager
· To ensure that all relevant preparations have been made.
· To ensure that all provisions of this method statement are followed.
· To ensure that all quality inspection is carried out and record taken, if
required.
· To ensure that all necessary safety and environmental precautions are in
place and that all workers under their direct control are fully aware of all
procedure requirements
· To control execution of the entire activity
2.4 Site Engineer
· To assist Chief Engineer to control the Subcontractor for all activities relative
to this method statement.
· To ensure safe working environment at all times, during Subcontractor
execution of concreting works.
2.5 Surveyor
· To give control points & grid line to Subcontractor for concreting works.
· To supervise Subcontractor and conduct survey checks from time to time.
· To carry out all surveying work and to ensure all required records are taken
and maintained.
2.6 QA/QC department
· To oversee construction activity with respect to quality control.
· To ensure quality procedures has been followed.
4. · To ensure that all required inspections have been carried out and that
records, if required have been taken and properly stored.
· Advise the laboratory and Site Engineers to control the quality of works.
2.7 Health, Safety & Environmental department
· To monitor that all the working activities are executed in accordance with site
Construction Joint
treatment
safety procedures.
· To ensure that precautions with respect to Environmental matters have been
implemented on site.
3. Sequence of works.
Assembling re bar
Inspection of re bar
Setting Formwork & Form oil
sheathing
Setting Temporary Staging for
casting
Inspection for casting
concrete
Placing Concrete
5. Stripping of form works
Curing for Concrete
4. Formworks Design
Formwork shall be set in correct position following specification and the approved
structure drawing. Temporary opening will be provided at bottom & middle of column for
cleaning, inspection & casting purpose.
Please refer to Appendix B for detail of formworks for each building.
Approved form oil will be applied to form surface prior to installation of form.
5. Construction joint treatment
All construction joints will be chipped to remove cement sand surface to make rough
surface.
In some cases, approved retarder for concrete surface will be used as another method
to make construction joint properly.
6. Rebar fabrication & setting
Approved re-bar type will be delivered to site and it will be inspected & tested prior to
use.
Re-bar shall be cut and bent according to the approved schedule at the site workshop
and transport to site by truck. After delivery to the site re-bars shall be fixed according to
specification and approved drawings by Engineer or Consultant.
Rebar shall be inspected by Engineer or Consultant before setting of formworks.
Approved concrete spacer shall be used; its concrete grade shall be 35 MN/m2.
6. 7. Installation of embed item
All the embed item showing in the drawings shall be firmly installed in correct position.
8. Placing of Concrete
Approved ready-mix concrete will be transported from batching plant to the site by mixer
truck. During transportation & waiting time the concrete shall be kept continuously
agitated.
From mixer truck concrete will be poured to casting location by concrete pump or by
bucket. The height from discharge position to casting level shall not be over 1.5m.
On each concreting day and for each grade of concrete mix, samples shall be taken.
When samples are taken at sites, samples shall be taken for every 24m3 of concrete or
part thereof, of each grade of concrete.
Minimum requirement of sample
- Each concreting day
- Each part of structure (each building)
- After filling above condition, samples shall be taken for every four mixer or
agitating truck (20~24m2).
9. Compaction of Concrete.
Concrete after pouring to position shall be compacted by immersion vibrator. Proper
staging for vibration works will be arranged.
Wooden or rubber hammer also will be used as external vibrator.
Please refer to Appendix B for scaffolding arrangement.
10. Removal of formworks
Form works removal shall be accordance with specification.
All tie rod holes & defects on surface will be repaired following approved method.
7. 11. Curing.
After removal of form works, concrete shall be cured minimum of 6 days according to
TCXDVN 391:2007– Requirements for Natural Moist Curing, apply for Area C of Viet
Nam.
Curing of concrete will be carried out by spraying water periodically to the surface of the
newly placed concrete. Jute bag or nylon sheet shall be used to cover the concrete
surface for keeping wet.
Water to be used for curing and cleaning works is portable water from local authority.
Approved curing compound also can be used in several cases.
12. Protecting against raining.
Against raining, plastic sheet shall be prepared to cover over the concrete area before
concreting.
13. Electricity
Electricity will be supplied by generators on site.
14. Equipment & Manpower
a)Equipment
Equipment Unit Quantity
Mixer truck Nos 04
Vibrator Nos 03
Concrete Pump No 01
Water Pump 2 HP No 01
Water Pump 1HP No 01
Generator 15KVA No 01
Generator 10KVA Nos 02
Bucket Nos 10
Showel Nos 05
Trowel Nos 05
b)Manpower
Description Unit Quantity
Supervisor No 01
8. Surveyor Nos 02
Foreman No 01
Electrician No 01
Worker Nos 10
APPENDIX A
FIRST FLOOR PLAN
