Blinding Concrete- Method Statement

CONTENTS

14.0 Repair of Damaged or Defective Concrete Surfaces 15.0 Communication

16.0 Safety

17.0 Environmental Control 18.0 Overall Programme

1.0

Scope

The statement covers methodology to be adopted for the execution of item 3.1.4/006; Outlet Channel leveling (blinding) concrete works as outlined in the Specifications and described in the Bill of Quantities or shown on the Drawings.

2.0 Reference (TOR)

 General Specifications  Technical Specifications  Construction Drawings.

3.0 Work Description

The Engineer shall inspect the finished formation surface to decide and approve appropriate thickness for each block or section.

Item No. Works Unit Quantity

(Approximate) Remarks 3.1.4/006 Concrete

Works m

3 _{2,045 Class “F”}

4.0 Equipment

The following plant and equipment will be used as and when required.

Equipment Make Model No. Specifications/

Capacity Remarks/ Purpose Batching

Plant Stetter H1 1 60m

3_{/hr Batching and}

mixing Concrete

Pump Stetter-Schwing MB 3331 KVG 34 XG 1 34M Height Truck mounted Placing Concrete Mobile

Crane Tadano 25t 1 25 Hydraulic Ton/ Lifting Placing Concrete Vibrators Various Poker 4 48 mm.

Electric/ Diesel

Compaction

Compressor Atlas Copco XAS 125 1 Diesel 125LPS Compressed air supply

Mixer

Trucks 4 7m

3 _Transporting

Concrete

5.0 Manpower

Item No. Remarks

Foreman (Formwork) 1 Foreman (Concrete) 1

Operators 4 Various Equipments Carpenter 4

Mason 10

Labourer _{3 gangs}

6.0 Working Hours

Concrete works should be performed in one shift; daytime only and working hours will be basically from 7.00 to 19.00hrs.

Night work may be required for concrete casting depending on temperature.

7.0 Preparation

Surface preparation will be done in accordance to Clause 6.1.8(2) of the Technical Specifications.

There after an inspection request will be made to the Engineer for approval and determination of blinding layer thickness for the bottom, slopes and top.

8.0 Transportation

The distance will be from the Batching Plant to Outlet Channel Sta. 0+000 ~ (Junction structure).

We will use 4 nos. concrete mixer trucks for transportation purposes. The trucks will comply with Clause 6.1.7(1) of the Technical Specifications as and when required.

9.0 Placing Concrete

Placing of concrete will only be done with the approval of the Engineer. We will inform the Engineer of the daily schedules of concrete placements. Concrete placement will not be done in rain, standing or running water.

Preparation for placing, placing and temperature of concrete will comply with Clause 6.1.8(2), (3) and (4) respectively.

All cleaning activities will be done using air compressor/blooms.

We intend to level blocks/panels with the following placement sequence:-

1) Bottom

2) side slope (Both sides) 3) Top (Both sides)

10.0 Consolidation

Consolidation will be achieved by using hand tampers. Where necessary the use of poker vibrator shall be used.

Check and control will be done to avoid honey combing, segregation, laitance or bleeding. 2,766 4,879 876 3 ,45 0 Bottom Left hand side

slope Right hand side slope

11.0 Curing and Protection of Concrete

Fresh concrete will be protected against injury or harmful effect due to sudden drying, loading, shock or vibration until it has hardened sufficiently to prevent damage.

I. Covering with dump Hessian cloth after casting to prevent direct sun rays. All concrete will be cured by water curing method.

The surface will be continuously wetted with water for 14 days in accordance with Clause 6.1.9(1) of the Technical Specifications.

We will use damp and hessian cloths or sand to protect concrete from direct sunrays with regular spraying to continuously moist them.

Water for curing will be of the same quality as that of concrete mixing. Concrete element

section Method of curing

Surfaces Water curing with sand -hessian cloth

12.0 Communication

During concrete placing, communication will be by means of 2 nos. 2-way hand-set radios and/or mobile cell phones.

Concrete grade will be on the call-off- sheet, which will be given to the batch plant operator once approved. The batch plant operator will always have a daily

programme and record for every delivery made with details of the concrete mix recipe.

The Section Manager will give a go-ahead to the batching operator by means of a radio or cell phone call.

At site, a dispatch check to the delivery note to ascertain correct Class of concrete will be done before placing.

13.0 Safety

We will prioritise all safety matters.

- Provide Personal Protective Equipments (PPE) such as helmets, safety boots, safety goggles, and safety gloves according to task at hand.

- A Safety Officer will always be on site equipped with a First-Aid-Box or a First- Aid-Attendant.

- All equipments will have banksmen in attendance during operation.

- Safety Officer will make an awareness safety meeting before the work commences.

Accident/Disaster Details Action

Heavy Equipment Accident

(Specially Crane)

Equipment trouble

Colliding with suspended Material.

Equipment falling down

Operators shall inspect the equipment before

commencement of work to ensure it is in good condition and operation reliability. To install the safety signboards Do not enter under the suspended material.

 To arrange for a watchman or barricade the working area

To make and confirm proper equipment stage for crane

Traffic Accident Over speeding

Agitator trucks overturning

To observe maximum speed.  50km/hr on temporary

access road.

 50km/hr on tarmac road To observe maximum speed. To prohibit over loading. To maintain road in good Condition.

Third Party Accident Traffic accident

Entering in the site.

To drive slowly near the school and houses.

To assign the flagmen at entrance of working areas.

To install safety signboards. To arrange watchman or Barricade the working area.

14.0 Environmental Control

(i) Metallic wastes will be stockpiled/ boxed at Site and thereafter dumped at Plant Yard as scrap.

(ii) Non-degradable materials will be properly disposed off at the disposal pit in the spoil bank.

(iii) Equipments/vehicles will be checked and maintained regularly to minimize exhaust emission during operation.

(iv) For dust control, dampening will be done in case excessive dust occurs during execution of the works. Dust control measures will be done to public roads and in all areas within the construction areas.

(v) Concrete spills from agitator trucks on transit will be collected and disposed at the nearest spoil bank.

15.0 Overall Programme.