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Products > CCP > Installation Techniques

 

[Features] [Pipe Designs] [Fittings] [Manufacturing] [Fittings Production] [Installation][Special Provisions] [Dimensions] [Deflections/Bevels] [Typical Designs] [References]

 

 

Unloading at Site 

Pipe is unloaded at the job site using a suitable equipment such as a crane. Handling equipment should be padded or otherwise designed to avoid damaging the pipe. Pipe may be strung along the trench side or in a temporary storage yard but should be properly supported along the bottom and blocked to prevent accidental rolling.

 
Trench Excavation 

Trenches shall be excavated to the line and grade shown on the layout drawing. In general, where no profile is provided, the trench shall be excavated to a depth which will be able to provide a minimum of one meter earth cover over the top of the pipe. Trench width should allow for proper densification of pipe zone bedding and backfill materials.

Sub-grade  

After trench excavation, the pipe laying contractor shall prepare a sub-grade which will provide continuous uniform support under the haunches of the pipe after bedding and backfilling. To accomplish this, the trenches shall be excavated to a depth not less than 25 mm below the established grade line of the outside bottom of the pipe, filled with loose bank run material, and graded uniformly to the established grade line for the full length of the pipe. To accomplish this, the trenches shall be excavated to a depth not less than 25 mm below the established grade line of the outside bottom of the pipe, filled with loose bank run material and graded uniformly to the established grade line for the full length of the pipe.  

Lowering Pipe onto Trench

Pipes are lowered onto the trench using devices which should provide protection to the pipe in general and to the pipe coating in particular. Pipe should be laid to the lines and grades shown on the contract drawing. Pipe laying should be scheduled, as far as practicable, in such a way that the bell end of the pipe faces the direction of laying.

Cleaning and Lubricating

Before jointing the spigot into the bell of the pipe previously laid, the spigot groove and bell shall be thoroughly cleaned, and lubricated with soft vegetable soap. The first 50 mm of the bell shall also be lubricated.

Placing Rubber Gasket

The rubber gasket shall then be positioned in the spigot grooves so that the rubber is distributed uniformly around the circumference. This can be accomplished by passing a smooth round steel under the rubber ring and up onto opposite edge of spigot groove, then moving the rod in this position around the entire circumference of the spigot.

Joining Pipes

After the pipe ends have been prepared, the pipes are now ready to be joined. The spigot end of the pipe is inserted into the bell end of the pipe already in place and given a strong steady push. Metal or wood spacers can be placed against the inside shoulder of the bell to provide proper space between abutting ends of the pipe.

Fitting and Short Assembly

Here we see shorts and fitting joined together.

Field Welding of Joints 

To restrain thrust forces, pipe ends (bell and spigot of adjoining pipes) may be welded.

Interior Grouting 

The inside joint recess between adjacent pipe is filled with a stiff mortar and then smoothed and finished flush with the adjacent pipe surfaces.

Exterior Joint Recess 

The exterior joint recess between two adjacent pipe shall also be filled with mortar. To accomplish this, a foam-lined plastic band, called diaper, is centered over the joint recess and secured by the use of steel strapping. Except for an opening near the top of the pipe, the diaper shall completely and tightly encase the outside joint. After the Diaper is properly secured, the joint recess is moistened with water and completely filled with mortar around the complete circumference of the joint. The opening is then closed, a mortar weight placed on top of the diaper, and the mortar allowed to set before bedding and backfilling at the joint.

Bedding and Backfilling 

Bedding and backfilling materials shall be clean and free from solid unyielding chucks, and shall not be dropped directly on the pipe. The materials shall be placed and densified in layers of the same elevation on both sides of the pipe to prevent unequal loading and displacement of the pipe. Backfilling above the pipe bedding may be placed as soon as densification of the pipe bedding material is completed. Backfill shall be placed to a minimum depth of one meter above the top of the pipe before any power-operated hauling or rolling equipment is used over the pipe.

 

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