This post will discuss the Method Statement for Pipe Culvert. Learn everything you need to know about pipe culvert planning, construction, and maintenance.
Table of Contents
Purpose
This work will consist of supplying and installing reinforced cement concrete pipes of the kind, diameter, and length specified in the design and details, and at the places indicated on the drawings.
Scope
The following are included in the scope of work:
Excavation
Headwall Construction
Pipe Laying Bedding
Backfilling Jointing
Resources
Excavator/backhoe loader
Transit Formwork Mixer
Dewatering Pump, Vibrator Batching Plant, and Dumpers as needed
Material
All materials used in pipe culvert construction must conform to the project specifications.
Before being included in the work, each consignment of cement concrete pipes must be examined and tested to conform to IS 458.
Responsibility
The department in charge will be in handling quality control for the Kerb construction team. He will be assisted by more field engineers, surveyors, supervisors, and lab technicians.
See Related: Method Statement for Box Culvert
Methodology
Excavation
The foundation bed for the pipe culverts and the headwall must be excavated in accordance with the lines and grades indicated on the drawings.
The HeadWall
As per the approved drawing, Portland Cement Concrete PCC of the specified grade and thickness shall be placed to the specified dimension and level for leveling course below headwalls.
The layout of the Headwall shall be made on the Portland Cement Concrete (PCC) in accordance with the approved drawing.
The formwork must be rigid and suitably braced both horizontally and vertically, and must be secured to true lines, levels, plumb, and so on. Form joints must be as tight as possible and must not allow any slurry to escape from concrete.
According to the site circumstances, head wall construction must be carried out in two stages.
The first stage should be completed all the way to the bottom of the hume pipe.
The second stage of concreting must be carried out. Following the placement and alignment of all pipes.
Bedding for Pipes
The bedding must be sand or granular material that passes through a 5.6 mm sieve. A specified thickness of granular material bedding shall be installed beneath the pipes in accordance with the approved drawing. The bed must be compacted/rammed with sufficient water.
In the case of high embankments where the height of fill exceeds three times the external diameter of the pipe, the embankment should be built first to an elevation above the top of the pipe equal to the external diameter of the pipe, and to a width on each side of the pipe not less than five times the diameter of the pipe, before excavating a trench for pipe bedding.
Pipe Laying
The arrangement for lowering the pipes in the bed must be done carefully so that no damage or undue strain is caused to the pipes; preferably, it should be done using a tripod, manual labor, or cranes for loading, unloading, and placing the pipes.
For new culverts, the spacing between two rows of pipes must be at least 450 mm or half the diameter of the pipe, whichever is greater, and the existing gap must be maintained for culvert widening.
The laying of NP4 pipes shall begin at the outlet end and end at the inlet end to the specified lines and grades as specified in the approved drawing.
Jointing
The pipes must be connected with a flush joint. The ends of the pipes are precisely designed to provide a self-centering junction with a 13mm wide jointing area.
The jointing space must be filled with cement mortar 1:2 that is sufficiently dry to stay in place. The jointing must be made with care so that the internal surface is smooth and consistent with the inside surface of the pipe. The joints must be kept wet for at least four days until they have hardened sufficiently.
The existing headwalls must be demolished to the level and dimensions specified in the approved drawing. The new pipe must be joined to the existing pipe in the manner described in the approved drawing.
Encasing of Pipes
Pipe encasing, if required, must be carried out in accordance with the approved drawings.
Backfilling
Following the completion of jointing and encasing, trenches must be backfilled.
The backfill dirt must be devoid of rocks, huge roots, organic soil, and any other harmful material, and it must be approved by the Engineer.
Backfilling up to 300 mm above the top of the pipe should be done with caution; the earth should be thoroughly rammed, tamped, or vibrated in layers not exceeding 150 mm, and great care should be used when consolidating the materials under the pipe haunches. This can be accomplished using approved mild mechanical techniques or tamping equipment.
Filling the trench should be carried out simultaneously on both sides of the pipe to avoid unequal pressures.
In the case of a high embankment, after filling the trench to the top of the pipe, a loose fill of a depth equal to the pipe’s external diameter should be laid over the pipe, and then additional layers should be added and compacted.
Testing and Acceptance for Quality Control
Quality control tests must be performed in accordance with the project specifications of the Quality Control Tests and Acceptance Criteria.
Environment & Safety for Method Statement for Pipe Culvert
While operating, the approved EHS Manual must be followed for safety and environmental procedures.
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