(MS) Slope Protection For Slope
(MS) Slope Protection For Slope
(MS) Slope Protection For Slope
METHOD STATEMENT
FOR
SOIL NAILING/ROCK BOLTING
1. PURPOSE
2. SCOPE OF WORKS
3. REFERENCE
4. PERSONNEL / RESPONSIBILITY
6.2.4 Shotcrete
7. QUALITY MANAGEMENT
※ Attachment
1) JHA _ Slope Protection for LNTP Work
2) Drawings for Slope Protection for LNTP Work
3) Shop drawing for Crane working area for LNTP No.1 slope
Page 1 of 14
METHOD OF STATEMENT
1.0 PURPOSE
This method statement covers the activities for slope protection such as soil nailing, rock bolt,
horizontal drainage and shotcrete works after (or along with) final slope cutting works.
3.0 REFERENCE
Responsible for the organization and coordination of the entire work based on the
recommendation through the procedure mentioned in this method statement
Responsible for the day-to-day implementation and supervision to prepare the activities
of slope protection in accordance with face mapping result and construction drawings.
Responsible in the implementation of safety measures following the approved HSE Plan
and methodology. Also check and ensure that their subcontractor(s) provide proper and
safe access to the mountain cutting area.
Page 2 of 14
METHOD OF STATEMENT
Responsible to assist the construction team to develop safe methods of working and to
ensure the compliance and implementation of HSSE plans and procedures.
Responsible for the execution of the works relayed by the Site Superintendent.
3.10 Spotter/Flagman
Responsible for ensuring the control of traffic specially the interaction between the heavy
and light vehicles
5.1 Material
5.3 Equipment
Page 3 of 14
METHOD OF STATEMENT
6.1.1 Slope protection from top to elevation (+) 30m for the area of LNTP No.1 to be
performed using 160 ton Hydro crane since the slope cutting already
commenced the final slope cutting. Please find attached Shop drawing for
Crane working area for LNTP No.1 slope
6.1.2 Slope protection activities for the area below elevation (+) 30m of LNTP No.1
and the area of LNTP No.2 will be followed the work sequence mentioned in
chapter 6.2.
Page 4 of 14
METHOD OF STATEMENT
1st Grouting
2nd Grouting
6.2.1.2 Drilling
1) Grouting shall be injected from end of the hole which is the lowest
part of the nailing hole.
2) Material of the grouting
✓ PC type 1
✓ Less than 45% of W/C ratio to be applied
✓ Mix Design for Reference
Strength W/C Unit Quantity of Material (kg)
(MPa) (%) Water Cement Inflating
21 45 586 1,303 13.03
4) Injection of Grouting
Page 6 of 14
METHOD OF STATEMENT
6.2.2.1 Drilling
Page 7 of 14
METHOD OF STATEMENT
Drilling
Grouting
6.2.3.2 Drilling
1) All material for rock bolt shall be comply with the requirement
which mentioned in the drawings and related applicable
specifications.
2) To prevent partial erosion in the hole, it shall be installed with
same angle of drilling. If it is not easy to insert due to partial
erosion in the hole, then the nailing shall be pulled out
immediately and cleaning of the hole shall be performed.
6.2.3.4 Grouting
1) Grouting shall be injected from end of the hole which is the lowest
part of the nailing hole.
2) Material of the grouting
✓ PC type 1
✓ Less than 45% of W/C ratio to be applied
Page 8 of 14
METHOD OF STATEMENT
6.2.4 Shotcrete
Shotcrete Pouring
Cleaning
Wire mesh will be installed after soil nailing including grouting. Slope surface
preparation shall be flat. Protruding rocks, tree stumps, and other obstructions
along the slope shall be removed so that the wire mesh can be properly laid
and closely attached.
Page 9 of 14
METHOD OF STATEMENT
Shotcreting
6.2.3.4 Material for Shotcrete
Page 10 of 14
METHOD OF STATEMENT
✓ PC type 1
✓ More than 65% of Fine Aggregate/Aggregate to be
applied
✓ Course Aggregate combined gradation
Aggregate 13 10 4.75 2.36 1.118 600µm
(m/m)
Passing 100 90- 70- 60- 40-60 20-40
Ratio (%) 100 75 70
✓ Accelerator : 5~12% of Cement
✓ Mix Design for Reference (one (1) cubic meter)
Strength W/C Unit Quantity of Material (kg)
(MPa) (%) Water Cement Aggregate Accelerator
21 45 192 L 400kg 1718kg 4L
6.2.1.5 Curing
7.1 Material
Page 11 of 14
METHOD OF STATEMENT
8.1.1 Personnel Protection Equipment (PPE) such as safety helmet, safety shoes, full
body harness, dust mask, gloves, safety vast (or luminous band), safety
glasses, and etc. should be equipped to all persons who works in the Site. It
shall be comply with approved HSE procedure.
8.1.2 Access to the work area shall be controlled by using hard barricade.
8.1.3 Properly certified and insulated tools should be utilized for the work with
electricity.
Page 12 of 14
METHOD OF STATEMENT
8.1.4 Protective facility for electrical and rotary machines shall be installed properly in
order to avoid any accident and/or incident to the workers.
8.1.5 Proper Permit to Work should be secured before commencing any activities,
and Job Safety Analysis shall be displayed at the work area.
8.2.1 If any Overhead Power Cable (OHPC) and/or Electrical Pole (EP) are located
near the work area, supervisor and/or safety officer shall be dispatched to
monitor and supervise the work in order not to touch the facilities.
8.2.2 Loader and rod of Drilling equipment shall be installed and placed under the
height of EP and OHPC.
8.2.3 The equipment parking area shall be reasonably away from the OHPC and EP
Page 13 of 14
METHOD OF STATEMENT
Page 14 of 14