Civil Engineering: kerb stone | Type of kerbs | desgin of kerbs

TOLERANCES

1). Different type of kerbs and dimension

2). Desgin of Kerbs

Tolerances:

All kerbing shall be placed within 20mm of its true plan position on the ground, and the rate of deviation from its true line shall not exceed 1 in 300. The road face and the back face of the finished kerbing shall be parallel.

Kerb Depth:

The profile of finished kerbing shall not be less than that shown in the Drawings.

Top surface:

The top surface shall be parallel to the ruling grade of the pavement and shall be free from depressions exceeding 5mm when measured from a 3m long straight edge.

BACKFILLING:

Material:

Where required, the area behind kerbs shall be backfilled with suitable select fill quality material or as directed by the Superintendent and compacted in accordance with the Specification 302 EARTHWORKS. The surface shall be constructed to the finished lines and levels shown in the Drawings.

Damage:

Any kerb sections dislodged during backfilling or otherwise misaligned shall be removed and re-laid at no cost to the Principal. Care shall be taken in backfilling to ensure that no damage, defacement or staining is caused to the kerbs and that the compaction requirements of the Specification are achieved.

TRAFFIC ISLANDS

1. In-Situ

Merging noses, approach noses, ramps, traffic island infill slabs, and other areas of medians and traffic islands as shown in the Drawings shall be constructed of in-situ concrete.

2. Thickness

The thickness of concrete shall exceed 100mm, except where otherwise detailed in the Drawings. The level of concrete infill shall be within +5mm and -0mm of the surrounding surface level.

3. Backfill

Select fill material shall be placed following the installation and setting of associated kerbing prior to placing of concrete slab, except where otherwise detailed in the Drawings, in accordance with Specification 302 EARTHWORKS. The backfill material shall be supplied, placed, levelled and compacted by the Contractor.

4. Finish

The finished surface of the concrete shall true and even without projections or irregularities and shall have a deep brush textured finish.

5. Expansion

An expansion joint 10mm wide shall be constructed between the extruded kerbing and the concrete infill. Approved joint filler shall be forced into the joint such that a 12mm deep groove remains. This groove shall be filled, after cleaning, with an approved joint sealant.

6. Contraction

Immediately after placing concrete, tooled contraction joints shall be formed at 2m maximum intervals. Joint edges shall be neatly pointed.

7. Sleeves

Grabrail and bollard sleeves, where required, shall be cast into ramps or concrete infill in accordance with the Drawings.

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KERB REPAIRS

1. Damaged Kerbing

Broken or damaged kerbing shall be removed and disposed of to the Contractor’s spoil site at no cost to the Principal.

2. Repair

The exposed concrete repair surface shall be roughened to remove all laitance and expose the aggregate to provide a thorough bond with concrete cast subsequently. The roughened surface shall be cleaned with water to remove loose chips and foreign material.

3. Wetting

Immediately before fresh concrete is cast against the existing surface, the existing surface shall be thoroughly wetted.

4. Placement

Class N20 concrete or rapid setting concrete products of like strength, shall be placed and compacted.

1). Different type of kerbs and dimension

2). Desgin of Kerbs