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CCTV Inspection - Underground Stormwater Pipe Drainage

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C220.12.1   WHEN IS A CCTV INSPECTION REQUIRED

 

1.         A minimum of two (2) CCTV inspections will be required to be undertaken for all installed pipe drainage infrastructure, to demonstrate to the Subdivision Works Accredited Certifier (SWAC) that the standard of the constructed drainage infrastructure is acceptable.

CCTV Inspections

2.         For stormwater infrastructure installed under road pavement, the first CCTV inspection shall be undertaken after the pavement AC seal has been placed and not more than two (2) weeks before the final, “on defects liability” (on Maintenance) inspection.

For stormwater infrastructure installed within the road reserve (but not under road pavement), the first CCTV inspection shall be undertaken within two (2) weeks of the final, “on defects liability” (on Maintenance) inspection.

For stormwater infrastructure installed outside the road reserve, the first CCTV inspection shall be undertaken after the final placement of topsoil and not more than two (2) weeks before the final, “on defects liability” (on Maintenance) inspection.

First CCTV Inspection

3.         A second CCTV inspection of all pipe drainage is required to be undertaken on or immediately after the expiration of the defects liability (maintenance) period.

Second CCTV Inspection

4.         Additional CCTV inspections are required of any remediation / repair works undertaken to the stormwater infrastructure, or as directed by the SWAC and/or Council to demonstrate that the standard of the drainage system is acceptable.

Other CCTV Inspections (as required)

5.         The CCTV assessment shall also include any existing stormwater infrastructure that is to be utilised within the design. Council will advise if any repair / upgrades to the existing system are required.

Use of existing infrastructure

C220.12.2   WHAT IS TO BE INSPECTED

 

1.         All stormwater networks with pipes up to 2000mm in diameter are to be CCTV inspected.

Pipe greater than 2000mm diameter are to be assessed by visual inspection.

CCTV up to 2000mm dia

2.         Pipes shall be inspected and reported on the following:

  1. Horizontal alignment
  2. Vertical alignment
  3. Cracks and defects
  4. Pipe joints
  5. Joints to manholes and other pipes
  6. Ovality

Assessment Criteria

C220.12.3   PRE INSPECTION CRITERIA

 

1.         All pipes are to be inspected upon delivery. A "No cracks policy" is to be adopted, giving the site supervisor the authority to reject any pipe with a crack when delivered.

Hairline cracks or crazing cracks associated with concrete shrinkage are permitted.

No cracks policy

2.         The acceptance of pipes upon delivery to the site shall be in accordance with the following table (which has been simplified from AS4058)

Acceptance criteria

Defect Description

Acceptability

Type 1 & 2

  • In pipes less than 900mm in diameter

Cracks up to 0.10mm not extending through the wall;

  • Acceptable after repair

Type 1 & 2

  • In pipes of 900mm or more in diameter

Cracks up to 0.10mm not extending through the wall;

  • Acceptable

Type 3

  • Cracks over 0.10mm or cracks extending through the wall;
  • Acceptable after repair and passes standard load test
 

Type 4

  • Dents, bulges, chips and spalls up to 2.5mm deep/high and up to 50mm long.
  • Surface blowholes less than 4mm deep and less than 10mm in diameter.
  • Acceptable
  • Acceptable

Type 5

  • Dents, bulges, chips, spalls and bony patches up to 5mm deep/high and up to 50mm long.
  • Bony patches on socket back walls less than 5mm deep:
  • Surface blowholes less than 4mm deep and more than 10mm in diameter;
  • Visible inclusions of foreign matter less than 0.1% of either the inside or outside surface with no individual area more than 400mm2 in area
  • Acceptable after repair
  • Acceptable after repair
  • Acceptable after repair
  • Acceptable after repair

Type 6

  • Dents, bulges, chips, spalls and bony patches more than 5mm deep/high and up to 50mm long.
  • Bony patches on socket back walls more than 5mm deep:
  • Surface blowholes more than 4mm deep
  • Defects as described above that are confined to the joints
  • Not acceptable
  • Not acceptable
  • Not acceptable
  • Acceptable after repair

Type 7

  • Visible inclusions of foreign matter more than 0.1% of either the inside or outside surface or with an individual area more than 400mm2 in area
  • Defects as described above that are confined to the joints
  • Not acceptable
  • Acceptable after repair
 

C220.12.4   INSPECTION CRITERIA

 

1.         The CCTV Inspection shall be carried out in accordance with the Water Services Association of Australia (WSAA) "Sewer Inspection Reporting Code of Australia" and the "Sewerage Code of Australia" (Sydney Water Edition).

CCTV Inspection Procedure

2.         CCTV surveys are to be undertaken using a camera with the ability to capture footage in colour and pan and tilt 360o.

 

3.         CCTV Field Assessors must have NATA accreditation under the Sydney Water Field Testing Services Program for CCTV inspections. Field Assessors must also have professional indemnity insurance adequate to cover the value of the works they are inspecting.

CCTV Field Assessors

4.         All pipes must be free of debris and silt at the time of inspection.

 

5.         The pipeline shall be assessed at the following speeds

Conduit Diameter

Allowable Camera Speed

Dia. < 200mm

0.1m/s *

200mm ≤ Dia. < 300mm

0.15m/s *

Dia. ≥ 300mm

0.2m/s *

* - Or as agreed by Council

Speed

6.         The camera must stop perpendicular to all cracks, defects, joints and manholes and pan 360°. Particular attention should be paid to any infiltration at joints and connections.

Stop and pan 360°

C220.12.5   ACCEPTANCE CRITERIA

 

1.         The pipe drainage will be acceptable if the SWAC is satisfied that the CCTV inspection does not reveal any defects that would constitute a departure from this specification or any other relevant Byron Shire Council Development Specification.

Acceptance of CCTV Inspection

2.         The misalignment of the lip at the inside of a joint between two connecting pipes shall not exceed 5mm.

At Joints

3.         The following criteria governs whether a crack or impact damage is acceptable without repair being required.

  1. Minor in nature - not more than 0.2mm in width
  2. No sign of displacement across the crack
  3. The edges of the crack are not crushed
  4. No sign of entry of sand or debris to the pipeline
  5. No rupture of the pipe surface at the site of a dent or bulge

Defects that defer from the above criteria are required to be repaired.

Criteria for crack or impact damage acceptance

4.         Structural Defects include;

  1. Cracks and fractures
  2. Deformed, collapsed and broken pipes
  3. Dropped inverts
  4. Displaced and open joints
  5. Surface damage
  6. Defective connections

Serviceability Defects include;

  1. Debris and silt
  2. Obstructions
  3. Infiltrations
  4. Roots
  5. Encrustation and scale

Types of Defects

5.         All cracks are to be assessed by the SWAC and / or a Council representative to determine the significance of the crack and thereby the acceptance, rejection or remedial repairs required.

It shall be at the sole discretion of the SWAC and / or the Council representative as to whether the identified defect is considered significant or not. Council may seek written advice from the Pipe Surveyor or the Pipe Manufacturer on this matter.

 

6.         All manhole and gully pit pipe connections are to be mortared flush with the walls and that no pipe reinforcement is exposed.

 

7.         The acceptance of pipes during and after installation shall be in accordance with the following table (which has been simplified from AS4058).

Construction Stage

Type of Defect

Acceptance and Remedial Action

After Installation

Type 1 & 2 Defects

Considered to be insignificant cracking and is defined as cracking that is less than or equal to 0.15mm in width

(a)   Any Circumferential Crack - No remedial action required.

(b)   Longitudinal cracks less than 300mm in length - No remedial action required.

(c)   Longitudinal cracks exceeding 300mm in length - Must be repaired, i.e. cracks to be filled and sealed to ensure a design life of 100 years is achieved. Contractor to provide written certification by a suitably qualified engineer or SWAC that the work is acceptable and has been carried out in accordance with the manufactures specification. A complete CCTV resurvey will also be required to show the condition of the repaired pipeline.

After Installation

Type 3 Defects

Considered to be significant cracking and is defined as cracking that is more than 0.15mm in width

(a)   The pipe is to be either replaced

or

(b)   Structurally Reline (liner and grout) a section of the pipeline for a minimum of 200mm each side of the crack or from manhole to manhole. The relined section must conform to the original hydraulic design criteria. Contractor to provide certification by a suitably qualified engineer or SWAC on the acceptability of any remedial works undertaken.

(b)   Resurvey will be required after the repair or replacement has been completed and all works reinstated.

During and After Installation

Type 3 Defects

(i)     Significant damage to collar or ends of pipe during installation or

(ii)    Significantly gouged or damaged through other construction activities

Pipe to be replaced, preferably at time of installation

Pipe to be replaced, preferably at time of installation

Acceptance criteria

8.         Sections of the pipeline that fail the ovality test are to be excavated and the trench and embedment replaced. Pipes that are crushed or creased are to be replaced.

 

9.         Pipes that are crushed or creased are to be replaced.

 

C220.12.6   SUBMISSION

 

1.         The Applicant must submit both a hardcopy report and an electronic report (submitted in CD or DVD medium in a format suitable to Council - as outlined below) of the CCTV inspection. The CCTV Inspection Report is a pre-requisite for issue of an Off Defects Liability Compliance Certificate.

            CD or DVD contents and format:

            a. Individual video files representing each section of pipe from node to node. (e.g. from MH 5A to MH 6A)

            b. Each video file is to be named appropriately to enable easy identification, utilising names as shown on the as-constructed or approved design drawings. (e.g. MH5A-MH6A)

            c. Video file format is to be MPG format.

            d. Copy of pipe survey report in PDF format.

 

2.         The reports must

  1. Specify the date of the inspection
  2. Specify location (including Street Name and number)
  3. Specify details of the reach being inspected( including line and structure numbers)
  4. Provide footage in colour
  5. Identify all faults, features and connections in the pipeline.
  6. Clearly show chainage along the pipeline
  7. Suggest appropriate remediation measures, as required.
 

3.         For pipes greater than 2000mm diameter a written report shall be submitted including;

  1. Certification of the pipeline by the SWAC,
  2. Digital photographs of any identified defects,
  3. Digital photographs of any remediation works undertaken.

For pipes greater than 2000mm dia

C220.12.7   IF REMEDIATION WORKS ARE REQUIRED

 

1.         Any defects identified by the inspection must be repaired or replaced in accordance with the provisions of this Specification, or as directed by the SWAC / Council.

 

2.         All costs associated with the CCTV inspection and rectification works shall be borne by the Applicant.

Costs

3.         Defects identified by the inspection requiring repair may be repaired using one of the following repair techniques;

  1. Tiger patch liner
  2. Econoliner
  3. PL Quick Sleeve System
  4. Flexi-Bond method
  5. Other such technique as approved by the SWAC and / or Council

Acceptable repair methods

4.         Circumferential cracks are to be repaired by installation of either a bandage for cracks on the outside or by Relining and Grouting for cracks on the inside or alternatively as approved by Council.

Circumferential cracks

5.         Longitudinal cracks are to be repaired by filling with an approved epoxy resin. The epoxy resin shall not be less than 1mm thick and extended at least 100mm from the crack in all directions. The repair is to be reinspected after curing is complete.

Longitudinal cracks

6.         A follow-up CCTV assessment is required of any repaired or replaced infrastructure, to demonstrate that the remediation measures undertaken are satisfactory to Council.