Installation Procedure FP McCann DN1050 Easi-Pit

Transcription

1 Installation Procedure FP McCann DN1050 Easi-Pit This document describes the recommended procedure for the installation of FP McCann Easi- Pit DN1050 Precast Concrete Catch-Pit, used in manhole construction (with particular use in highways construction). For information on manhole construction see Recommended Site work Practice Manhole Chambers FP McCann Easi-Pit PLANNING Receipt and Handling of Easi-Pits on Site 1. Time and place of off-loading should be agreed before units arrive at site. For safety, all Easi-Pits are delivered in chimney fashion and must be placed on level ground (ideally on timber support skids but not necessary), with Easi-Pits stacked no more that 2 no. in height. 2. Off-loading must be carried out using appropriate lifting equipment. It is recommended that clamp grabs fitted to a spreader beam are used to off-load Easi-Pits thus to avoid having to climb onto the trailer. F P McCann Ltd Easi-Pit Instal lation Procedure Issue date: Jan 2010 Next review d ate: Jan 2014 V ersion 1.0 Page 1 of 12

2 Off-loading the FP McCann Easi-Pit Spreader Bar Clamp Grab 3. Off-loading should take the place at the nearest hard road to the point of installation. The Easi-Pit must be stored vertically on firm flat ground with the concrete base at the bottom. 4. Carefully inspect units during off-loading to verify that products are undamaged and comply with order placed. Two types of check are required: Visual: Inspect the Easi-Pit for any sign of damage, including cracked or chipped concrete, or damage to the inlet / outlet anything that could affect the performance. Design: Check that the item received is the one ordered. Please note; Easi-Pits are generally ordered in accordance with the Predl Clock system or as specified by the contractor or engineer. Positions are generally specified in degrees either from 0 to 270. (A copy of PREDL Clock is included in Appendi x A). Easi-Pits are generally a bespoke product and are labeled with site references, to include: Client / Site Name, Site reference (e.g. MH 5), Outlet Position Production date Issue date: Jan 2010 Next review date: Jan 2014 Page 2 of 12

3 5. Any Easi-Pits rejected should be labelled and stored separately with the discrepancies for each noted on the delivery docket and reported for further action. CONSTRUCTION The Easi-Pit is manufactured to a height of 1000 mm with a grooved joint which faces upward. Precast concrete manhole chambers using the tongue and groove system are laid directly on top of the Easi-Pit unit and constructed as normal. Inlets and outlets within standard units are at an invert level of 300mm above sump as specified for catch pits in the highways specification (however other inlet heights are available upon request). A standard drain hole is provided in line with highways specification. Catchpits are constructed in accordance to BS EN 1917 and BS Issue date: Jan 2010 Next review date: Jan 2014 Page 3 of 12

4 FP McCann Easi-Pit Dimensions To ensure that the Easi-Pit and subsequent manhole structure remains vertical, accurate levelling of the formation and preparation of the manhole foundation is essential. Bedding and sidefill materials must comply with the requirements of Water Industry Specification BS EN F P McCann Ltd Easi-Pit Instal lation Procedure Issue date: Jan 2010 Next review d ate: Jan 2014 V ersion 1.0 Page 4 of 12

5 Sequence of Operations 1. Excavate to formation level ensuring that sides of excavation are adequately supported. Trench Supports Bedding as per paragraph 3 2. Trim and compact formation. 3. Place suitable bedding material (in accordance with BS EN 13242, as above) over the base of the excavation to a thickness of not less than 150mm. The bedding material should compose of 14 mm 5 mm graded aggregate; 10 mm nominal single size aggregate; concrete blinding; or as specified by local undertaker. 4. Level and compact bedding material. The bedding (if aggregate) should be laid in 2 layers with a whacker plate passed over each layer at least twice to compact. 5. Check that the correct DN1050 Easi-Pit has been brought to the installation point. Cross reference and check pipe connection orientation with that of the catchpit. The movement of Easi-Pit on site must be undertaken in a manner that is safe and will not cause any damage to the unit in any way the use of clamp grabs fitted to a spreader beam or alternatively standard lifting pins is recommended. 6. Place the Easi-Pit unit onto the bedded surface. The outlet and manhole reference is clearly marked on each unit. The unit should be lowered into position. It is essential that the Easi-Pit with all pre-fabricated orientations is positioned according to the site layout plan. Issue date: Jan 2010 Next review date: Jan 2014 Page 5 of 12

6 7. When placed check all pipe inlet and outlet levels and ensure that the surface of the Easi-Pit is level by checking the rim at the top of the base (using appropriate equipment). This will ensure the unit has been installed fit for purpose. Jointing to Pipeline The Easi-Pit has rubber seals which connect directly to any form of pipe. Perform joint as follows: Ensure that the rubber seal is in position at the connection port of catchpit and pipe; Lubricate the connection port on the manhole and pipe using an approved FP McCann pipe lubricant; Push the pipe into the connection port until fully inserted; Check that the seal is water tight and that the gradient and line of the pipe is acceptable. To allow for any differential settlement between manhole and pipeline, short rocker pipes should be used, and in the case of upvc a slip collar is then used to connect the Easi-Pit to the pipeline. (Refer to Appendix C for a table of Seal Connectors used with Easi-Pit). Jointing to Manhole Chamber Sections Easi-Pit sections (as with manhole chambers) are provided with a tongue and groove joint formed within the wall section (groove facing upward). These are sealed with cement / sand mortar in accordance with SHW series 2400 or alternatively with proprietary non-shrink mastic sealant or as specified by local undertaker. As with precast concrete manholes, well jointed Easi-Pits provide an adequate seal under normal conditions. Pipe connections should be made before installation of manhole chamber ring risers. Erect the required number of manhole chamber rings (standard components) and seal the joints as appropriate; all in accordance with the design. Check that subsequent rings remain vertical. Issue date: Jan 2010 Next review date: Jan 2014 Page 6 of 12

7 Place a reinforced concrete manhole cover slab on top. If required place a corbel slab and then add the appropriate number of adjusting units. Fit the manhole top for access from the ground. Adjusting Unit Manhole Cover Slab Bitumen Sealer Reinstatement Sidefill / in-situ concrete surround to be placed in accordance with the specified requirements of the particular project. All sidefill material to comply with the requirements of WIS Testing Testing to be carried out in accordance with the specified requirements of the particular project, or as specified by the local undertaker. Issue date: Jan 2010 Next review date: Jan 2014 Page 7 of 12

8 Appendix A DN1050 Catchpit Highways Specification Issue date: Jan 2010 Next review date: Jan 2014 Page 8 of 12

9 Appendix B PREDL Clock Issue date: Jan 2010 Next review date: Jan 2014 Page 9 of 12

10 F910 Seals for Twinwall Pipes Appendix C - Table of Seal Connectors Pipe DN Pipe Material Supplier Pipe OD Hole OD Universal Seals 150 Twinwall Twinwall Wavin x 16.0 Polypipe x 16.0 Twinwall JFC / MAJO / CHERRY x Twinwall Twinwall Wavin x 20.0 Polypipe x 20.0 Twinwall JFC / MAJO / CHERRY x Twinwall Twinwall Wavin x 20.0 Polypipe x 20.0 Twinwall 375 Twinwall JFC / MAJO / CHERRY Universal Seal x x 20.0 Issue date: Jan 2010 Next review date: Jan 2014 Page 10 of 12

11 F910 Seals for upvc Pipes Pipe DN Pipe Material Supplier Pipe OD Hole OD Seal 110 PVC ALL X PVC ALL X PVC ALL X PVC ALL X PVC ALL X 20 F910 Seals for Clay Pipes Pipe DN Pipe Material Supplier Pipe OD Hole OD Seal 150 Supersleeve Hepworth x Supersleeve Hepworth x Supersleeve Hepworth x 20 Issue date: Jan 2010 Next review date: Jan 2014 Page 11 of 12

12 F910 Seals for Ductile Iron Pipe Pipe DN Pipe Material Supplier Pipe OD Hole OD Seal 100 Ductile Iron ALL X Ductile Iron ALL X 20 Issue date: Jan 2010 Next review date: Jan 2014 Page 12 of 12