Method Statement for Dismantling Culverts, Bridges, Pavements and Other Structures

1. Purpose

The purpose of this Method Statement is to define the detailed construction methodology for dismantling culverts, bridges, pavements, kerbs, and other structures in accordance with the provisions of MoRTH Clause 202 and relevant amendments in the Technical Specifications.

2. Scope of Work

The work shall consist of removing existing culverts, bridges, pavements, kerbs, and other structures that interfere with new construction activities or are unsuitable to remain in place. The work shall also include salvaging, disposal of dismantled materials, and backfilling of resulting trenches and pits.

Existing structures located within the highway limits and designated for removal shall be dismantled up to the extent shown in the Good for Construction (GFC) drawings or as directed by the Authority Engineer.

Dismantling operations shall be carried out using suitable equipment such as backhoe loaders, excavators, dozers, graders, tractor dozers, jackhammers, or excavators fitted with rock breakers, depending upon the type of structure.

Care shall be taken to avoid disturbance or damage to adjacent pavements, structures, underground utilities, and any work intended to remain in place.

All dismantling operations that may affect new construction shall be completed before commencement of new works. Traffic diversion, safety arrangements, and traffic management measures shall be implemented as per approved methodology prior to dismantling activities.

Dismantling work shall commence only after obtaining approval from the Authority Engineer.

3. Sequence of Operations

3.1 Dismantling of Culverts and Bridges

Existing culverts and bridges shall be dismantled carefully to prevent damage to reusable materials, portions of structures to be retained, nearby properties, and adjacent structures.

Where existing culverts or bridges are to be extended or incorporated into the new work, only the required portion shall be removed as directed by the Authority Engineer.

Connecting edges shall be cut, chipped, and trimmed to the required alignment and levels without weakening the remaining structure.

Reinforcement bars intended for future connection as dowels or ties shall be protected from damage during dismantling operations.

Pipe culverts shall be dismantled carefully to avoid breakage or damage to the pipes.

3.2 Dismantling of Pavements and Other Structures

Existing pavements, kerbs, gutters, and other structures shall be dismantled as specified in the drawings and Technical Specifications.

Portions intended to remain in service shall be cut neatly along straight lines or existing joints with faces perpendicular to the pavement surface.

Sufficient dismantling shall be carried out to achieve proper grades, alignment, and connection with the proposed works.

Concrete pavements, bituminous pavements, shoulders, and base courses designated for dismantling shall be broken into pieces not exceeding 0.02 cubic metres.

Dismantled materials shall either be stockpiled at approved locations for reuse or disposed of as directed by the Authority Engineer.

Holes, depressions, and excavated areas resulting from dismantling operations shall be backfilled using approved material and compacted to the specified density.

Disposal of dismantled materials shall be carried out in accordance with the relevant Technical Specifications and environmental requirements.

4. Equipment Used

• Backhoe Loader
• Excavator
• Bull Dozer
• Tractor Dozer
• Motor Grader
• Jack Hammer
• Excavator with Rock Breaker