CIVIL WORK METHOD STATEMENT REV 2 (APPROVAL)

CIVIL WORK METHOD STATEMENT

9769-22-TNF-PWK-3-007-P

REV.2 REPAIR OF EXPOSED 30" PIPELINE AT RCB- TNF 565 & 563

CONTRACT No. 4600009769

PAGE 1 of 12 Status : C

REVISION LIST

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CONTENTS

C1. TITLE PROCEDURE............................................................................................................... 0

C2. REVISION LIST ....................................................................................................................... 1

C3. CONTENTS .............................................................................................................................. 2

1. INTRODUCTION ............................................................................................................ 3

2. REFERENCE DOCUMENTS ......................................................................................... 3

3. BACKFILLING PROCEDURE ....................................................................................... 3

3.1 SCOPE...................................................................................................................... 3

3.2 PERSONNEL ............................................................................................................ 3

3.3 EQUIPMENT ............................................................................................................. 3

3.4 EXECUTION ............................................................................................................. 4

3.5 SAFETY .................................................................................................................... 4

4. INSTALLATION GEOTEXTILE PROCEDURE ............................................................. 5

4.1 SCOPE...................................................................................................................... 5

4.2 PERSONNEL ............................................................................................................ 5

4.3 EQUIPMENT ............................................................................................................. 5

4.4 EXECUTION ............................................................................................................. 5

4.5 SAFETY .................................................................................................................... 6

5. INSTALLATION GABION MATTRESS PROCEDURE ................................................ 7

5.1 SCOPE...................................................................................................................... 7

5.2 PERSONNEL ............................................................................................................ 7

5.3 EQUIPMENT ............................................................................................................. 7

5.4 EXECUTION ............................................................................................................. 7

5.5 SAFETY .................................................................................................................... 9

6. ATTACHMENT ............................................................................................................... 9


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1. INTRODUCTION

Repair of Exposed in the project 30-inch pipeline at RCB-TNF 565 & 563, contract no.

4600009769 very closely related to the elements of civil works, the work purpose is:

1. Protect and strengthen the soil and slope of the river cliff.

2. Maintaining the stability of the river bank soil.

Civil works is that Backfilling, installation of Geotextile, and installation Gabion Mattress.

The following description of the Civil works.

2. REFERENCE DOCUMENT

- ISO 9001 : 2008.

- Writing Document Procedure No. 9769-22-TNF-PWK-3-001-P.

- Procedure Control of Nonconformance Product No. 9769-22-TNF-PWK-3-015-P.

- Project Execution Plan No. 9769-22-TNF-PWK-3-004-P.

3. BACKFILLING PROCEDURE

3.1 SCOPE

Backfilling works for the improvement of soil conditions on this project. This procedure

defines the requirements Backfilling procedure, element of Repair of Exposed 30 inch

Pipeline at RCB-TNF 565 & 563, contract no. 4600009769.

3.2 PERSONNEL

Supervisor : 1 person

Technician : 2 persons

QC : 1 person

Helper : 2 persons

3.3 EQUIPMENT

Tools :

Crane barge and Clamshell

Tug boat

Sea truck

Material :

Soil

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3.4 EXECUTION

Make sure areas to be backfilled to be free from debris, steel, wood, etc.

Pipeline protection to anticipate for any dropped object.

Backfilling be carried up evenly on both sides of the pipeline and under pipeline.

Finished, surface of filled areas level with the ground existing.

Figure 1. Backfilling

3.5 SAFETY

Where multiple activities are scheduled, the general contractor is to review in advance

the priority of work and schedule the appropriate time frame to allow each to complete

their scope of work.

Prior to any work commencing supervisors must conduct a hazard assessment of all

applicable work areas. Any hazards that are found during the hazard assessment must

be addressed prior to any work commencing.

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4. INSTALLATION GEOTEXTILE PROCEDURE

4.1 SCOPE

This procedure defines the requirements Geotextile installation, this Procedure covers

for Repair of Exposed 30 inch Pipeline at RCB-TNF 565 & 563, contract no.

4600009769. Construction using high strength geotextile as reinforcement structure of

soil, the material is made from high molecular weight, high tenacity polyester

multifilament yarns.

4.2 PERSONNEL



QC : 1 person

Helper : 5 persons

4.3 EQUIPMENT

Tools :

Standard Safety Equipment (gloves, goggles, safety helmet, etc.)

Material:

Geotextile

4.4 EXECUTION

a. SITE PREPARATION

Unsuitable soil must be cleared from the site and the foundation soil shall be

excavated or filled and leveled to the designer’s requirements. Sharp objects i.e.

stumps, boulders or construction material that can puncture the Geotextile shall be

removed from the site.

b. PLACING OF GEOTEXTILE

Geotextile to be used is NILEX 4553 (Attachment 6.1).

Geotextile shall be manually unrolled over the soft soil. Care should be taken

during unrolling to avoid wrinkles and to prevent damage to the Geotextile.

Connection geotextile overlapping each sheet mounted on the next sheet.

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In the curved mounting area (e.g. street corner), geotextile installed follow the

direction of the curve.

If the geotextile is installed to direct sunlight then used black geotextile.

Figure 2. Installation Geotextile

4.5 SAFETY

Observe the site owners established safety policy at all times and obey all written and

verbal instructions from site managers and representatives. Wear all personal

protective equipment at all times including hard hat, safety glasses, boots, gloves,

supplied air respirators and masks as required. When preparing and applying coatings

and chemical materials all personal protective equipment must be worn including:

gloves, safety glasses, supplied air respirators and protective paper masks as required.

When using high pressure plural component spray equipment, all personnel working in

the application area must wear double filter breathers or supplied air respirators.


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5. GABION MATTRESS PROCEDURE

5.1 SCOPE

This procedure defines the requirements Gabion mattress procedure, element of

Repair of Exposed 30 inch Pipeline at RCB-TNF 565 & 563, contract no. 4600009769.

The function to maintain of soil stability.

5.2 PERSONNEL



QC : 1 person

Helper : 5 persons

5.3 EQUIPMENT

Tools :

Welding machine

Standard Safety Equipment (gloves, goggles, safety helmet, etc.)

Material:

Wire galvanized assemblies (by Vendor)

Wire ties and connectors

Gravel

5.4 EXECUTION

a. FOUNDATION PREPARATION

The foundation on which the gabions are to be placed shall be cut or filled and

graded to the lines and grades shown on the drawings. Surface irregularities, loose

material, vegetation, and all foreign matter shall be removed from foundation

surface area. When fill is required, it shall consist of materials conforming to the

specified requirements. Gabions and bedding or specified geotextiles shall not be

placed until the foundation preparation is completed, and the subgrade surfaces

have been inspected and approved by the engineer or the engineer’s

representative. Compaction of bedding or filter material will be required per plans

and specifications. The surface of the finished material shall be to grade and free of


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mounds. Extra care should be taken with foundation preparations in order to ensure

a level and smooth surface. Geotextile shall be installed in accordance with the

requirements of the plans and specifications.

b. PLACEMENT

Place the empty gabions on the foundation and interconnect the adjacent gabions

along the top, bottom, and vertical edges using lacing wire or spirals. Wrap the wire

with alternating single and double half hitches at intervals between 100 mm and

150 mm. Spiral fasteners are commonly used for the assembly and interconnection

of welded mesh gabions. Spirals are screwed down at the connecting edges then

each end of the spiral is crimped to secure it in place. Lacing may be used as

needed to supplement the interconnection of welded mesh gabions, and the closing

of lids. Interconnect each layer of gabions to the underlying layer of gabions along

the front, back, and sides. Stagger the vertical joints between the gabions of

adjacent rows and layers by at least one-half of a cell length.

c. FILLING OPERATION

After adjacent empty wire gabion units are set to line and grade and common sides

properly connected, they shall be placed in straight-line tension to gain a uniform

alignment. Staking of the gabions may be done to maintain the established proper

alignment prior to the placement of rock. Connecting lacing wire and other

fasteners (as allowed) shall be attached during the filling operation to preserve the

strength and shape of the structure. Internal connecting cross-tile wires shall be

placed in each unrestrained gabion cell greater than 500mm in height, including

gabion cells left temporarily unrestrained. Two internal connecting wires shall be

placed concurrently with rock placement, at each 300 mm interval of depth. In

welded mesh gabions these crossties or stiffeners will be placed across the corners

of the gabions (at 300 mm from the corners) providing diagonal bracing. Lacing

wire or preformed wire stiffeners may be used. The gabions shall be carefully filled

with rock, either hand methods, ensuring alignment, avoiding bulges, and providing

a compact mass that minimizes voids.


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Figure 3. Installation Gabion Mattress

5.5 SAFETY

Where multiple activities are scheduled, the general contractor is to review in advance

the priority of work and schedule the appropriate time frame to allow each to complete

their scope of work.

Prior to any work commencing supervisors must conduct a hazard assessment of all

applicable work areas. Any hazards that are found during the hazard assessment must

be addressed prior to any work commencing.

6. ATTACHMENT

6.1 Specification geotextile

6.2 Specification gabion wire

6.3 Specification Rock materials (filler)

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6.1 Specification geotextile


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6.2 Specification gabion wire


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6.3 Specification Rock materials (filler)

Rock Class

Rock Size (m) *

Approximate Rock Mass

(kg)

Percentage of Rock Larger than Rock Size in the Second Column

Typical Use (Examples Only)

Type A 0.20 0.10

0.075

0 50 90

Catch pit Surrounds

Type B1 0.30 0.20 0.10

0

50 90

Culvert Outlets

Type B (Facing)

0.40 0.30 0.15

100 35 2.5

0 50 90

Culvert Outlets

Light 0.55 0.40 0.20

250 100 10

0 50 90

Floodway Batters

Quarter Tonne

0.75 0.55 0.30

500 250 35

0 50 90

Floodway Batters

One Tonne

1.15 0.90 0.55

2000 1000 250

0 50 90

Floodway Batters

Two Tonne

1.45 1.15 0.75

4000 2000 500

0 50 90

Floodway Batters

Rock Pitching

0.40 x 0.40 x 0.20

0.15 x 0.15 x 0.15

60

100

Landscaped Slopes (Typically Limestone)

CIVIL WORK METHOD STATEMENT REV 2 (APPROVAL)

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