FREE SAMPLE METHOD STATEMENT FOR RETAINING WALL CONSTRUCTION.

Stage 1.

1.       Before proceed with any works, survey and setting out shall be conducted to 

       provide the guide on levels and alignment for the construction of the Reinforce 

       concrete Retaining Walls.

2.       Survey and setting out shall be done in the present of Resident Engineer or his 

       representative.

3.       Request for inspection shall be submitted prior to start the works.

Stage 2.: Earthworks (Excavation)

1.       Earthworks can only commence after the setting out was done and accepted by 

       Resident Engineer.

2.       The sequence of the Earthworks is as the following Diagram 1.

Diagram 1.

3.       The excavation at Sequence 1 will be done until it reaches the proposed platform level 

       where it will provide wider temporary diversion during the construction of the Retaining

       wall structure.

4.       The excavation work at sequence 2 will only commence after the completion of sequence 1.

5.       The sequence 2 will provide access for existing traffic during the excavation work 

       activities at sequence 1.

6.       The Layout after completion of earthworks activities for both sequences will be as the 

       following Diagram 2.

 Diagram 2

Stage 3: Construction of RC Retaining Wall Structure.

Level  1: Piling Works

1.       Piling works will commence after the completion of first half of the sequence 2 

       earthworks.

2.       The sequence of the piling works will be done starting form the end Chainage 

       of the Retaining wall progressing to the front Chainage.

3.       The excess of drive R.C pile will be cut as soon as the Piling works reaches 

       practical numbers of piling points to enable the pile cut off activities.

Level 2 : construction of the R.C Retaining wall Base.

1.       The construction of the base will commence as soon as after the preparation of the

       pile head reaches the practical length of the standard steel bar supply length or 

       available safe working area. (eg. Standard steel bar supply length / pcs = 12m )

2.       All of the installed reinforcement must be free from rust, properly tied and being 

      installed according to construction drawings and specifications.

Level 3: Concreting works.

1.       Concreting works will only commence after the installed reinforcement being 

       inspected and accepted and approved for next sequence of works by Resident Engineer 

      or his or her representative.

2.       The sequence of concreting activities will also start from the end chainage of the R.C 

      Retaining Wall base.

3.       Concreting works will commence as soon as the installed reinforcement for the base 

      reaches the possible delivery concrete volume to site per day and practical output of

      the concreting works.

4.       Prior to concreting activities, all installed formworks for the base shall be properly secure 

      to avoid formwork failure.

5.       During concreting activities, test cube and numbers of the cube to be prepared shall be 

      as per directed by Resident engineer or his or her representative.

6.       There shall be no concreting activities during raining day.

7.       The flow of the installation of the reinforcements and concreting activities shall be as 

       per diagram 3.

Diagram 3

Level 4: Construction or R.C Wall.

1.       The construction of the R.C concrete wall shall proceed as soon as the Concreted base 

       is ready to accept the next sequence of the works.

2.       Construction of the wall shall start for both side of the retaining wall concurrently. 

      However some section of the wall might need to be left open to suite the site condition and 

      the movement of machineries.

3.       R.C wall construction activities shall start from end chainage of the retaining wall.

4.       The height of each wall that is ready for concreting shall not exceed 2.4 meter high. This is 

       to avoid the formwork failure.

5.       Prior to fully erect the formwork, wall reinforcement must be inspecting by Resident engineer 

       or his representative for acceptance and approval for next sequence of work.

6.       Prior to concreting activities formwork shall be properly secured to avoid formwork failure 

      during concreting activities.

7.      There shall be no concreting activities conducted during raining day.

8.       Flow of the R.C Wall Construction is as shown in the following Diagram 4.

 

Diagram 4

Stage 4: Backfilling to completed Retaining Wall.

1.       Backfilling activities will commence as soon as the fully completed section of the 

      retaining wall is ready to received backfill material and also practically safe for the 

      other on-going construction activities for remaining Retaining wall structure.

2.       Each layer of backfill shall be not more than 500mm thick and shall be properly 

      compacted before laying of subsequence layer of backfill. This process is repeated 

      until the whole height of the retaining wall if filled.

3.       Backfill activities will commence from the end chainage of the retaining wall towards

     the CH 6 + 200.

Stage 5: Miscellaneous works.

1.       Miscellaneous works will commence upon completion of the whole retaining wall 

      structure inclusive of backfilling works.

2.       The miscellaneous works are the flexible pavement, drains and  road furniture.

Overall sequence of the stages:

STANDARD FORM OF CONTRACT

Contract document is a very important document that every personal cannot afford to missed out. Failure to understand the content of this document can lead to essential legal aspect of a contract which in the end will lead to major financial losses. In view of this consequence, it is good to first familiarised ourselves with the standard form of contract. The reason why this is important mainly due to that all contract will be prepared base on standard form of contract. Any extra requirement or specification normally will be added in as special condition of contract.

Base on my observation, most of the personal especially contractor, always neglect this aspect during the tendering process. This missing stage in tendering always resulted to contractor under price or under estimated the actual construction cost. If only this practice had not been skip, there will be lots of unnecessary losses to bare by parties involved. Under priced or under estimated always happened with the lump sum contract where bill of quantity is not provided in the tender document. Usually lump sum contract will only mention on the major works that need to be completed. for example, there is item describe as preliminaries and general, however it was not been elaborate further. For instance, there is no detail item spell out in the bill of quantity such as compliance to DOSH (Department of Occupational Safety and Health) act or environmental act or also compliance to local statutory and regulatory. In actual fact all of this had been spelled out in the standard form of contract.

As construction personal all of the standard form of contract contents and also special condition of contract just cannot been separate from the tendering process. For our further reference please refer to our respective nation or department that we deal with for the standard form of contract. The standard form of contract link that I include here might be useful to us.

STANDARD FORM OF CONTRACT.

JKR SARAWAK STANDARD FORM OF CONTRACT.

MALAYSIA JKR STANDARD FORM OF CONTRACT 203A(REV.2007)

MALAYSIA JKR STANDARD FORM OF CONTRACT FORNOMINATED SUPPLIER 203P

MALAYSIA PAM STANDARD FORM OF CONTRACT 2006(WITH BQ)

ROAD CONSTRUCTION SCOPE OF WORKS

Road construction is a Simple construction works compare to building work. This is mainly due to the reasons that in road construction there is not so many component of works that need to be done.

The major component of the Roadworks are only as listed below.

1. Survey and setting Out.
2. Site clearing
3. Earthwork.
4. Preparation of the Sub-grade.
5. Sub-base
5. Road-Base
6. Laying of Binder course
7. Laying of Wearing course
8. Road marking.
9. Drainage works
10. Road furniture( Signage/Guardrail & etc.)
11. Road marking
12. Bridge (if required under contract)
13.Traffic Lights (if required under contract).

However for building works, there is lots of components that need to be done in order to complete a building. The major component works are as follows;

1. Survey and setting out
2.Earthwork
3.Piling works.
4.Foundation works.
5. Stump
6. Beam
7. Slab
8.Slab
9.Wall
10.Staircase
11. Roof truss
12. Roofing
13. Internal cold water system
14. External water reticulation
15. Sewerage system
16. Internal electrical wiring System
17. External electrical wiring System.
18. Ventilation system
19. Finishing work ( Painting & Tiling )
20. Fencing & gate.
21. Door and windows.
22. Landscaping.
23. ect....

Building work consists of many trades compare to roadwork. For more detail list for the roadworks, please navigate here. This Roadworks scope of work list can be download for free.

Setting Out of Column Vertical Alignment

Column Vertical Alignment is very important in order to construct a straight vertical building. Now a days, setting out of the vertical alignment had been made easy with the advance technology such as leaser beam device. However in the event that the device that you are using is found faulty, do you know how to continue doing your work without the aid of that technology? In order for you to construct a true vertical column, the first thing that you need to get it right is the formwork itself

In view of this kind of situation, it is always good that we know the primitive way of doing it. All that you need are;
1. Measuring tape,
2. string,
3. timber and
4. Plumbob or heavy material that can pull the string straight (downward)

This primitive way does not even require any usage of Spirit Level.

All you need to do is assemble those. The picture below is how you need to assemble all that basic equipment as mention above. As mention earlier, to get a straight vertical column, first you need your formwork to set correctly. Hence from the picture shown, you can always replace the reinforce concrete column with your fabricated formwork. Once you get your vertical alignment correct, you can secure your formwork from moving. The same goes if you are installing timber type column.

How do you know that your column is vertically straight? What you need to know is the measurement of X1 is the same measurement for X2 and measurement for Y1 having the same measurement value as Y2.