Method Statement for Laying Kerbs , Precast Concrete Barriers, & Paver Interlock Blocks Installation

This Method Statement for Laying Kerbs, Precast Concrete Barriers, & Paver Interlock Blocks Installation defines the sequence, quality procedures, and health, safety & environment (HSE) requirements to be followed for the implementation of the activity.

References

Project Specifications (Vehicle Crash Barriers)
Project Specifications (Kerbs, Footways, and Paved Areas)
Health, Safety, and Environment (HSE) Plan
Construction Environmental Management (CEMP) Plan
Concrete Specifications
Method Statement for Concrete Works
Barriers and Kerbs Setting Out

Responsibilities

Project Manager

Responsible for accomplishing the stated project objectives which include creating clear and attainable project objectives, building the project requirements, and managing the constraints of the project management triangle, which are cost, time, scope, and quality.
The Project Manager shall be responsible for ensuring that the Project Quality Plan and the Inspection and Testing procedures, Method Statement for Laying Kerbs, Precast Concrete Barriers, & Paver Interlock Blocks Installation, HSE safety, and all contractual documentation are maintained up to date and accessible to all parties.

Construction Manager

Responsible for overall construction activities ensuring that all method statements, quality, and safety procedures are implemented and required approval permits are obtained.

Site Engineer

Supervise operations in accordance with the approved Method Statement for Laying Kerbs, Precast Concrete Barriers, & Paver Interlock Blocks Installation, shop drawings, specifications, material submittals, and schedules to achieve the acceptance of the project deliverables.

Site Supervisor

Supervise closely, the activities designated to them and ensure that all instructions and safety procedures are followed and strictly adhered to.
Supervise the work to ensure that technical, quality, safety, and purchase order requirements are met.
Attend daily site meetings and communicate his daily report with the Project/Site Engineer.
Participate in the training and development of his subordinates; Organize with the Project/Site Engineer to ensure the availability of plant, equipment, and labor to his designated work activities; Closely monitor the usage of
consumables and materials by his crew in order to minimize wastage.
Assess the craftsmanship of subordinates under his control.

Chief Surveyor /Land Surveyor

Carry out a pre-construction survey to fix the locations and corresponding elevations as per the approved shop drawings.
Ensure quality and compliance during phases of surveying works and the regular checking of the surveying equipment or periodic calibration from the third party.
Ensure the validity and the serial number of calibration certificates is available and posted in the survey equipment.
Ensure proper safety guarding of surveying equipment.
Maintain the records of all surveying equipment handled.

Survey Aide

Maintain the surveying equipment.
Assist Surveyors in taking measurements, record measurements manually or electronically, and peg out boundaries.

HSE Manager

Health, safety, and environmental (HSE) managers generally plan, coordinate and implement issues and directives within the organization.
They ensure safe environmental working conditions for all employees.

HSE Engineer

Ensure enforcement of safety procedures in accordance with the approved HSE Plan.
Closely monitoring the site engineer’s strict implementation of the Method Statement for laying Kerbs, Precast Concrete Barriers, & Paver Interlock Blocks Installation and Risk Assessment, the use of proper tools and equipment to maintain safety, certifications of equipment and their adherence to safety regulations, reporting of any unsafe work or stopping work that does not comply with ES&H procedures.

Resources

• Plant and Equipment

Leica TS 15m Total Station
Transit Mixer
Mobile / Tower Crane
Boom Truck
Trucks and Lorries
Plate Compactor
Trowelling Tools

• Work Force

Site Engineer
Site Supervisor
QA/QC Engineer
HSE Engineer

• Light Tools

Hand Tools
Power Tools

Materials

Approved project materials:
Precast Concrete Barriers
Precast Kerbs
Precast Paver Interlock Blocks
Cork/Filler Boards
Sealant
Backer Rod

Methodology

Installation of Concrete Barriers

1. Concrete barriers shall come in precast element and shall be mass concrete of grade C25. Surface shall be applied with anti-carbonation paint with white color.
2. The Surveyor will mark the layout of the installation.
3. The precast element will be lifted and installed using 25mm thick sand-cement mixture (3:1 mortar bed).
4. At the location of 50mm Ø Drain Pipe @ 10m c/c, a 300mm x 300mm x 300mm of 50mm Ø single size gravel wrap with geotextile will be provided.
5. In between the installed concrete barriers which are the median will be filled with sand fill and on top, paving blocks will be placed.
6. The concrete barriers will have a 20 mm gap to each other and the same 20 mm gap for expansion joints location. On this gap, a joint filler will be installed and at the joint surface, an approved joint sealant will be applied on top of inserted approved backing rod.
7. After installation, any defects shall be repaired using approved repair materials compatible with the original surface finish of the precast barriers.

Laying Kerbs

1. Kerbs shall be precast and come in 2 types, Flushed Kerbs and Upstand Kerbs with polished finish color as per project specifications. Kerbs shall have a mixture containing not less than 400 kg/m³ of sulfate-resisting Portland cement.
2. The 28-day compressive strength shall be not less than 30 N/mm² determined on 150mm cube specimens, and not less than 75% of this figure after 7 days.
3. Testing of concrete kerb shall be carried out in accordance with the requirements of BS EN 1340.
4. The Surveyor will mark the layout of the installation.
5. Both flushed kerbs and upstand kerbs shall be installed using 25 mm thick sand-cement mixture (3:1 mortar bed) with a ±3 mm tolerance at each end of the element.
6. After kerb units have been laid, a contiguous backing of concrete shall be poured for the elements using steel forms and well cured.
7. Joints between kerbs shall have a width of 4 mm filled completely with fluid sand cement mortar approved by the Engineer. The joints shall be formed again.
8. At every 10 m interval, a movement joint shall be formed to the concrete bed and backing with bitumen-impregnated cork/filler board. The filler shall extend through the kerb, bed, and backing, and shall be trimmed to the finished shape of the kerb.
9. The thickness of 10 m interval movement joints shall be 20 mm.
10. At the termination of any kerb run, the end kerb section shall be sloped down to ground level and angled away from the road at 30 degrees in accordance with BS 7533.
11. Flushed kerbs shall be installed and flushed with the level of 60mm thick Paver Blocks and 60mm thick wearing course.
12. Kerb elements shall be set on to the designated lines and grades. Under no circumstances shall it be permitted for levels to be set by direct measurement from pavement layers.
13. In between the upstand kerbs and the drainage trench, an approved sealant will be applied.
14. Immediately after any concrete is in place and for seven days thereafter, the kerbs base and backing shall be fully cured and protected from drying out and against the harmful effects of weather (Such as rain and rapid temperature changes). Concrete not properly cured and protected will be rejected and shall be removed from the site.

Installation of Paver Interlocking Blocks

1. Standard rectangular precast concrete paving interlocking blocks shall have a work size length of 200 mm and a work size width of 100 mm and the preferred work size thickness is 60 mm.
2. The actual size of the paving blocks as determined in accordance with BS EN 1338 shall not deviate from the work size dimensions by more than the following tolerances:
   1. Length ±2 mm
   2. Width ±2 mm
   3. Thickness ±3 mm
3. The average crushing strength of 16 paving blocks shall not be less than 49 N/mm² and the crushing strength of any individual block shall not be less than 40 N/mm².
4. The paving blocks shall be laid generally in accordance with BS 7533-3 and to a pattern approved by the Engineer.
5. Paver interlock blocks with 60 mm thickness shall be laid on a laying course consisting of fine aggregates (sand setting bed). The fine aggregates shall be placed in a moist but not saturated condition and shall be compacted so that a laying course thickness of 50 mm approximately is formed.
6. The paving blocks shall be laid on the laying course and compacted using a plate compactor with a plate area of not less than 0.25 m².
7. A maximum deviation for the block paving from design levels of ±6 mm shall be maintained.
8. The joints between the paving blocks shall be filled with dry jointing sand by spreading it over the surface and brushing it into the joints. The block paving shall be vibrated by tapping using a rubber mallet to ensure that the joints have been completely filled.

Safety Requirements-Method Statement for Laying Kerbs, Precast Concrete Barriers, & Paver Interlock Blocks Installation

1. Protective and Safety Equipment
   All workers Involved shall be equipped with adequate PPE as stated below:
   a. Safety Helmet with Company Logo
   b. Safety Boots
   c. High Visibility Vest
   d. Safety Goggles
   e. Hand Gloves
   f. Coveralls
2. Information to Personnel
   a. Safety Induction
   b. Job training
   c. Superintendents Notices/Memos
   d. Toolbox talks
   e. STARRT Card
3. Special Safety Requirements
   a. All necessary personal/protective equipment (PPE), as well as harness, be provided.
   b. Banksman, wearing distinctive vests, shall be assigned to help operators maneuver their equipment.
   c. The equipment operators shall possess the required licenses and certificates.
   d. Generated dust shall be controlled by periodic water spraying.
   e. The project safety officer is responsible along with the project zone site engineer for ensuring that all operations are carried out with due regard to the safety of all project personnel & property.
   f. All working activity shall comply with Client Safety Procedure.
   g. First Aid Material.
   h. General management of protection/operation hazards is to be observed.

Environment Issues

1. Precautionary Measure-
   All precautionary measures shall be briefed to all workers prior to commencing activity.
2. Disposal Requirements-
   All waste shall be disposed of as per the Construction and Environmental Management Plan, (CEMP) and as per Government approved disposal areas.

Quality Requirements

1. Inspection, Test, and Sampling-
   Request for Inspection and Testing will be submitted prior to and after execution of works as per the Inspection and Test Plan (ITP).
2. Quality Assurance Requirements-
   Project Specifications
   Project Quality Plan