FP McCann Jacking Pipes
FP McCann provides an extensive range of concrete pipes and fittings. All products are manufactured from high quality raw materials and are sulphate resistant.
FP McCann’s jacking pipes enable pipe installation where the opening of trenches is neither practical nor cost-effective.
FP McCann’s jacking pipes are made from dense, durable reinforced concrete. The mix provides a design chemical class 4 (DC4), with a minimum 28 day characteristic cube strength of 50N/mm2. They are manufactured in accordance with BS EN 1916 and BS 5911-1 and certified by Quality Assessment under the kitemark scheme and ISO 9001.
Features of FP McCann Jacking Products Include:
• Self-lubricating joint gasket
• Built-in handling system with an extensive range to suit most machines and shields
Lead pipes are located at the front of the drive. It is standard practice to fit a steel shield over the lead pipe in every hand dug drive, providing protection to miners and facilitating steering. Machine dug drives do not usually require a lead pipe as the contractor can adapt the machine to fit over a standard pipe spigot.
• A flat end instead of a spigot - 600mm long by 20mm deep rebate
• Joint gaskets are not supplied as standard with lead
Grout Sockets or Lubrication Holes
Designed to reduce friction during jacking, lubricating or grout sockets can be cast into standard pipes to suit customer requirements. They are normally 1 1/4”BSP steel sockets fitted with plugs. Conical non-return valves are supplied as standard. The ratio of pipes with grout sockets to standard pipes varies, depending on ground conditions. As a guide, it can be one pipe in every three or one in every five.
It is important that suitable packing material is used between adjacent pipes to ensure even stress distribution and load transfer. We recommend medium density fibre board (MDF). FP McCann can supply and fix packers at works, although the contractor usually supplies and fixes them on site prior to pipe installation. It is important that packers are fitted in the correct position.
Intermediate Jacking Stations (Interjacks)
lnterjacks are frequently installed on drives where the jacking forces required exceed the capability of the pipe or the jacks. Installing interjacks relieves pressure on the whole drive length by first pushing the section of pipes in front of the interjack using jacks installed within the interjack itself; the rear section of pipes is then pushed by the main jacks. Each interjack station comprises two pipes, a lead and a trail, with a steel can or shield which is either cast integrally with the lead pipe - a fixed can, or fitted round the pipe separately - a loose can. The interjack trail pipe is common to both fixed and loose can types. The choice of interjack type is usually left to the contractor’s preference.
Fixed Can Interjacks
These are used with steel collar pipes. FP McCann provides the lead pipe with the can already fitted. It then becomes the contractor’s responsibility to fit suitable steel thrust rings, packers and jacks inside the can.
Loose Can Interjacks
Generally used with in-wall jointed pipes and have a lead pipe with a short 300mm by 20mm recess in place of the socket. The contractor provides the can as well as the thrust rings, packers and jacks.
Interjack Trail Pipes
Recognisable by their long 1400mm by 20mm rebate instead of the normal spigot. Two recesses are located towards the end of the rebate to take special sealing rings provided by FP McCann. Lubrication points are positioned between the recesses.
To assist the contractor in adopting a safe working method for lowering heavy pipes into deep, confined spaces, the FP McCann Easi-lift handling system is available for pipes from DN 900 to DN 2400. Galvanized lifting anchors are cast into the pipe wall and are used in conjunction with certified lifting shackles and chains to provide a safe, speedy and accurate system of off-loading, stacking and placing. Anchors are positioned below the outside diameter of the pipe to avoid any potential to snag or plough.
Benefits of Jacking Pipes
Safe - Easi-lift ensures a positive horizontal lift every time, no weight balancing is required.
Accurate - pipes can be lowered down deep shafts and onto the jacking cradle in one smooth, easy operation.
Time saving - lifting eyes are engaged and disengaged by rotation in a few seconds.
Cost saving - eliminates the purchase of cumbersome slings and reduces the risk of damage to pipes.
No leaks - through lifting holes which need sealing.
Lamell is a fast, efficient, easy-to-fit pipe joint seal. Incorporating an innovative, self-lubricating SBR gasket, the Lamell seal is ideal for use in wet conditions. Lamell provides a reliable, flexible, water-resistant seal requiring no additional lubrication.
Pipes for Special Requirements
FP McCann’s jacking pipes are designed to meet all normal in-service conditions. However, there are situations which demand special consideration. FP McCann can offer a number of options to help combat more extreme conditions, such as:
• Additional cover for reinforcement beyond the British Standard minimum 15mm. This acts as a sacrificial layer where aggressive effluent or attrition is anticipated, so prolonging the life of the pipe
• Stainless steel collars to suit ground or effluent conditions
• Alternative mix designs to suit ground or effluent conditions
• Protective coatings or linings to suit ground or effluent conditions
• Special strength pipes with increased reinforcement
• Secondary seals can be provided, if requested
Note: special requirements or non-standard products should be ordered in advance of their anticipated delivery dates.