Scan for more information Hynds Manhole System Technical Guide D4.1 The Hynds Manhole System consists of precast concrete and iron components designed to offer proven manhole performance giving the installer flexibility onsite. 07.17 DRAINAGE D4.1 Hynds Manhole System Applications Stormwater manholes Drop manholes Pipeline junctions Pipeline direction changes Catchment inlet structures Off-take risers Caisson chambers Product Attributes Proven performance Durability Strength Versatility Different wall thicknesses available Lid and cover options to suit various load requirements Approvals/Standards Manufactured to AS/NZS 4058, Precast Concrete Pipes NZS 3109, Concrete Construction Quality ISO 9001:2008 Quality Management Standard The go to organisation for civil and rural water product solutions
Our new range of concrete lids are designed for specific loadings to give you more assurance in your manhole system design and performance. The system includes a range of manhole diameters and riser heights, various concrete lid options, ductile and cast iron covers and frames, step types, galvanised landing platforms, joint sealants, clamps and manhole base options. Flanged base and riser sections are steel reinforced so there is no need for preformed holes or knockouts making alignment very easy and flexible. Entry and exit cut outs can be made wherever and to whatever size required, just before installation. Applications Stormwater manholes Drop manholes Pipeline junctions Pipeline direction changes Catchment inlet structures Ductile and Cast Iron Streetware Lid Adjustment Ring D4.1 Hynds Manhole System DRAINAGE PG 2 Soakholes Off-take risers Caisson chambers Features Proven performance Strong and durable Versatility - able to be adjusted on site to suit design conditions Complete range of diameters and riser heights available off the shelf at branches throughout NZ Wall thickness options (standard, thick wall and extra thick wall) Lid and cover options manufactured to the geometric tolerances of AS/NZS 4058 Lids are designed for specific load ratings Manhole Lid Manhole Riser Section Manhole Steps Design Requirements When designing a Hynds Manhole System consideration should be given to the diameter, height, riser and lid strengths, connections, installation and accessory options. The Local Council Authority should be contacted to determine regional requirements for manhole construction. If no conditions are available then the following factors may be used (as a guide only): Minimum manhole diameter of 1050 mm. Single entry/single exit manholes typically have a diameter 1.6-2.0 times the diameter of the larger pipe connecting into it. Multiple entry/single exit manholes are larger and dependent upon structural restrictions and flow limitations. 150 mm 150 mm or 200 mm Precast Flanged Base Fig. 1 Schematic elevation of Hynds Manhole System.
Manhole Lids The Hynds Manhole Lid range includes lids rated for pedestrian to highway loads, with 530 mm or 600 mm offset openings as standards. Other options are available. Manhole Risers The Hynds Manhole System includes nominal internal riser diameters from 1050 mm to 3200 mm. Note: Refer to Table 2 for a range of standard sizes. Connections Pipe connections fitted into the riser wall are made onsite using striking or cutting tools. All Hynds Manhole Risers are reinforced with fabricated steel cages which require removal with bolt cutters only after all holes are cut out. Working from outside the flanged base, punch the smallest possible hole diameter (pipe O.D. + 50 mm). d d Riser Strength Hynds Manhole Risers are manufactured using high strength concrete and fabricated circular steel reinforcement to achieve a Standard strength manhole suitable for most installations. For manholes with high axial load requirements, or where extra wall thickness is required for durability purposes, a thicker wall option (Type TW) is available. Type TW risers will typically have a 20-25 mm internal sacrificial layer to provide the thicker wall and will include a standard 200 mm thick base to acommodate for the load of the thicker wall. Where a manhole is subjected to high horizontal loads on one side, such as those arising from extreme wheel loads, a higher strength manhole (Type ETW) may be required. For more details on loads for precast concrete manhole chambers, download the Guidance Note for loads on Circular Precast Concrete Manholes and Access Chambers from the Concrete Pipe Association of Australasia s website. Manhole Base Options Hynds Pipe Systems manufacture riser sections cast into flanged bases to form a single precast unit. Standard flanged bases usually rely on the site benching to ensure watertightness between the riser section and the flanged/internal base. Where watertightness is critical such as deep manholes, sewer manholes and sewer pump stations, special flanged/internal bases incorporating a hydrophilic waterstop are available on request. Note: Refer to D4.2 Hynds Hyseal Sealed Manhole System Technical Guide for further details. Fig. 2 Manhole/Pipe selection and minimum distance between pipes 1. Manhole and pipe selection Maximum opening or pipe O.D. = 0.65 x MH I.D. 2. Minimum distance between pipes (d) When equal sized pipes: 300 mm or d = 0.75 x pipe O.D. (whichever is greater) Example: Ø1050 pipe O.D.= 1218 mm; d = 0.75 x 1218 mm = 914 mm Therefore the required minimum distance in the horizontal plane between pipes is the max between 914 mm and 300 mm; i.e. 914 mm. When un equal sized pipes: 300 mm or d = 0.65 x largest pipe O.D. (whichever is greater) Example: Ø675 pipe O.D.= 779 mm and Ø1050 pipe O.D.= 1218 mm; d = 0.65 x 1218 mm = 792 mm Therefore the required minimum distance in the horizontal plane between pipes is the max between 792 mm and 300 mm; i.e. 792 mm. D4.1 Hynds Manhole System DRAINAGE PG 3 Fig. 3 Manhole Connectors
D4.1 Hynds Manhole System DRAINAGE PG 4 For connection of rigid pipe materials (vitrified clay and spun concrete) epoxy or cement mortar should be used. For connection of PVC pipe materials, Hynds Pipe Systems supply purpose made manhole connectors in 100 mm and 150 mm diameters. These sealed units are made up of a BS EN 295 vitrified clay pipe short coupled to a PVC short and then held together with a patented heat shrink process to ensure that the connectors cannot come apart when being installed. The clay pipe short is epoxied to the concrete manhole riser wall. Manhole structures installed in regions prone to settlement should be fitted with pipe shorts prior to installing the connected pipeline. Manhole shorts are not recommended for pipes above 675 mm internal diameter. Manhole Concrete Lids Hynds manufacture a wide range of precast concrete manhole lids to suit manholes from 1050 mm Ø to 3200 mm Ø that are designed for the following specific load ratings: 5kN LD20 HD60 HN-HO-72 Pedestrian (1050 Ø only) Lightly Trafficked Areas Roads where specific bridge rating design is not required Bridge Manual loading. Majority of residential and secondary roads. The lids vary in thickness from 100 mm to 225 mm depending on the manhole size and load rating. All lids are clearly marked with their item code which will designate their design loading. Depending on the local authority requirements, your local Hynds branch should have the common sizes with the standard lid openings of 530 mm Ø and 600 mm Ø available ex stock. For these lid opening sizes, the distance from the inside wall of a standard Manhole Riser to the lid opening edge is approximately 100 mm. Special design manhole lids, and lids with cast in covers, grates and frames are also available to order. Note: Refer to the Hynds Manhole product guide for a full listing of the various concrete lids available. Access Steps and Platforms Safety steps may be used to fit standard holes set at 300 mm intervals within the riser sections, with the first step placed 150 mm down from the top of the riser. Steps are available in galvanised steel, stainless steel or plastic encapsulated steel. Steps are fitted to preformed holes and the nuts tightened from the outside to compress rubber pads between washers. Steps should be positioned to allow safe access to and from the manhole invert (refer to Local Authority) and to avoid hydraulic obstruction. Note: Refer to Table 4 for list of step lengths to fit Hynds manhole riser sections. Fixed galvanised steel ladders complete with lift up sections are available for pump stations or manhole off takes. Hynds galvanised landing platforms are designed for bolting to the internal riser wall and are recommended for positioning every 3-5 metres of depth (depending upon service procedures and fall arrest requirements). Hynds galvanised grills and scruffy domes are designed for bolting on top of the riser to prevent unauthorised entry. Fig. 4 Light Duty Cast Iron Manhole Cover and Frame 540 mm Manhole Covers and Frames Standard manhole covers and frames are manufactured from strong and durable cast and ductile iron. The cast iron cover and frame is coated with a bituminons protective compound, and the ductile iron cover and frame with a water based non toxic paint. Types include LD (Light Duty) for pedestrian and domestic vehicle use, HD (Heavy Duty) for light commercial up to 7 Tonne wheel load, Extra Heavy Duty for Industrial and Carriageway use. Note: For the full range of access safety grilles, covers and frames please contact your local Hynds Branch. Fig. 5 Heavy Duty Ductile Iron Maestro 600 mm Class D 400 kn
Installation Hynds precast manholes are installed using modern excavation equipment and techniques. Manholes are generally installed prior to the pipelines connecting into them. The manhole foundation should be prepared with compacted hardfill to prevent excessive settlement. A manhole structure may be constructed as follows: 3. Consider site specific health and safety requirements (check flanged/internal base does not contain water or any other items, which may increase the weight of the unit). 4. Bolt steps into riser components. 5. Prepare punch outs (see connections) and lower flange base unit into place using a spreader beam and appropriate lifting equipment. 6. Place appropriate joint sealing compound continuously around the joint circumference (collar end). 7. Place the next riser section (using a spreader beam and appropriate lifting equipment). 8. Make and seal pipeline connections. 9. Bench invert as required. 10. Place and seal the manhole lid. 11. Place and mortar seal lid adjustment rings to required level. 12. Position access frame and cover. Joint Sealing Hynds Manholes allow sealing at the riser joints and the lid/riser joint. Sealing occurs between the female collar and male spigot end. Sealing compounds are available from Hynds Sales Branches for even application between the mating surfaces. Options include: 1. Grey Butyl Manhole Sealant - Hynds (SM9020). This product does not have a memory and provides a flexible joint. It has a moderate amount of surface tack making it easier to pull the joint apart, if required. 2. Black Butyl Mastic Manhole Sealant - Hynds (MSR). This has memory and provides a more flexible joint. It has a stronger bond to the concrete faces, making it more difficult to pull the joint apart. Hynds recommends this sealant for installations with high water tables. 3. Epoxy Mortar - Hynds (Hybond). This is a two part epoxy mortar which will result in a rigid joint. It is commonly used for patching concrete as well as to joint concrete components such as in bends and off-takes. Fig. 6 Onsite Manhole Sealant Application To help prevent joint leakage through manhole settlement, optional galvanised steel manhole clamp sets (three per joint) are available. (Holes for the clamps will need to be drilled on site). The clamps offer additional transfer of load between joints. Where watertightness is critical such as deep manholes, sewer manholes and sewer pump stations, extra care is required in selecting and installing the appropriate joint sealant. Manhole risers, without preformed step holes, are available for use in situations where step irons are not required. As an extra assistance in preventing water infiltration a barrier material such as Aquawrap can be used to cover the external part of the joint. Refer to D10.16 Aquawrap Technical Guide. Large diameter risers in the range 1950-3050 mm are also available with rubber ring joints for use in deep manholes and pump stations. Testing The pressure testing of installed manhole components is normally required for foul sewers only. This test typically follows the requirements set out in NZS 4452, with water tests being the only accurate way to determine leakage rates. D4.1 Hynds Manhole System DRAINAGE PG 5
Table 1 Standard Manhole Riser Range Specifications Nominal Internal Diameter (mm) 1050 1200 1400 1500 1650 1800 2050 2300 2550 3000 3200 Internal Diameter (mm) External Barrel Diameter (mm) (*) Standard Wall Thickness (mm) Weight per metre (kg) (**) Lifting Anchor Load Group 1066 1207 1372 1524 1676 1829 2032 2300 2550 3008 3200 1194 1347 1524 1677 1842 2007 2236 2580 2850 3308 3520 64 70 76 77 83 89 102 140 150 150 160 583 727 900 1010 1200 1430 1742 2736 3240 3832 4339 1.3 2.5 2.5 2.5 2.5 5 5 10 10 10 10 Note: (*) Thick wall and Extra thick wall versions may be available. (**) The load group specifies the maximum lifting capacity or Working Load Limit (WLL) of the lifting clutch expressed in tonnes. For additional information please refer to Reid Concrete Lifting Systems Design Guide. Table 2 Standard Riser Mass in Kg D4.1 Hynds Manhole System DRAINAGE PG 6 Nominal Riser Height (mm) Nominal Internal Diameter (mm) 1050 1200 1400 1500 1650 1800 2050 2300 2550 3000 (NI) 300 176 218 270 303 360 418 522 400 1296 450 261 327 405 454 540 628 785 500 1368 1620 600 349 436 540 604 720 837 1047 2300 700 1915 900 525 654 810 909 1080 1255 1569 2916 3450 1000 3832 4339 1200 700 872 1080 1212 1440 1673 2091 3284 1500 874 1091 1350 1515 1800 2092 2616 4859 5750 3000 (SI) 3200 1700 4652 1800 1050 1309 1620 1818 2160 2510 3139 6900 1900 5199 6155 2000 6479 2100 1225 1527 1890 2121 2520 3003 3661 2400 1399 1745 2160 2424 2880 3427 4186 6567 7775 9018 NI= only available in North Island SI= only available in South Island All dimensions are nominal Table 3 Step lengths to fit Hynds manhole riser sections Nominal Internal Diameter 1050 1200 1400 1500 1650 1800 2050 2300 2550 3000 3050 3200 Step length for bolting Standard Short Short Short Short Short Short Short Short Short Short Short Short Class TW Class Long Long Long Long Long Long Long Short Short Short Short Short
Table 4 Standard Flanged Base with Riser Mass in Kg Nominal Base Height (mm) Nominal Internal Diameter (mm) 1050 1200 1400 1500 1650 1800 2050 2300 2550 3000 (NI) 3000 (SI) 3200 (NI) 300 847 1033 1260 1460 2460 400 5345 500 4718 5671 600 1020 1251 1530 1763 2084 2439 2985 6319 700 5265 900 1197 1469 1800 2066 2444 2868 3507 6965 8856 1000 7840 10270 1200 1373 1687 2070 2369 2804 3297 4029 6634 7938 1500 1545 1906 2340 2672 3164 3726 4554 8908 11156 1700 8002 1800 1720 2124 2610 2975 3524 4155 5077 12306 1900 8549 10204 2000 10528 2100 1896 2342 2880 3278 3884 4584 5599 2400 2070 2560 3150 3581 4244 5008 6124 9917 11824 14603 NI= only available in North Island SI= only available in South Island Standard Flanged Base thickness is 150 mm For a listing of the many concrete lids available, please refer to the Hynds Manhole product guide. Correct On site Handling and Jointing of Pipes Optional 200 mm thick base with Hydrophilic sealant in sizes 1050 1800 mm Standard 200 mm thick base with Hydrophilic sealant in size 2050 3200 mm Standard 200 mm thick base for thick wall and extra thick wall versions D4.1 Hynds Manhole System DRAINAGE PG 7 Shock loads resulting from travelling with suspended risers or flanged bases over rough terrain and uneven ground may exceed designed safety factor load of the lifting systems. It is critical that care is taken during lifting and transporting as additional stresses could result in anchor failure. Do not lift the risers or flanged bases by one anchor during loading, unloading, transportation or in the yard. Lifting in this way could potentially bend the anchor and cause failure. All risers or flanged bases must be lifted in accordance to the correct on site handling using spreader beams. Damaged Lifting Anchor Correct method Note: Use a lifting beam or spreader bar to avoid damage to the riser. Using a Spreader Beam between two chains will ensure no damage to top edge of the manhole riser. Component Lifting Hynds precast concrete manholes are delivered with lifting anchors cast into the concrete walls. Note: Refer to Table 1 for details of the lifting anchors. Anchors are cast into set positions to accept a static vertical lifting force without dynamic forces. Use a spreader beam and appropriate lifting equipment to avoid overstressing a particular anchor, ensure that all anchors are securely held to provide an even vertical load passing through each point.
Safe Handling How Swiftlift lifting clutches work The lifting clutch is attached to the Swiftlift anchor by lowering the clutch slot over the anchor and rotating the clutch tab until it rests on the concrete surface. The tab is located on the side that will be uppermost when lifting. When the load is raised the anchor takes the full load in tension. As the load rotates or is lifted with the anchor in shear, the clutch comes into contact with the concrete. This transfers the lifting force into the concrete and the anchor prevents the clutch slipping out of the recess. Appropriate clutches for anchor sizes should always be used (Table 1). Tail is rotated over to sit on surface Lift Creates tension in anchor Lift direction D4.1 Hynds Manhole System DRAINAGE PG 8 Effective Rigging and Sling Angles The larger the sling angle the higher the load on the chains. For example at an included angle of 170º the load on each sling is six times the weight of the actual load being lifted. Do not put more than the recommended safe working load on equipment. Hynds manhole components are fitted with Swiftlift inserts, thus providing a safety factor which is well over the industry standard of three, when slung in the correct manner. However, care still needs to be taken when lifting the Hynds manhole components, especially over uneven surfaces as shock loading may exceed the designed safety factor. Please note: An insert with a nominal clutch size rating stamped on the head does not necessarily have the same safe working load limit because of the various insert lengths available. Also refer to: D4.2 Hynds Hyseal Sealed Manhole System D4.6 Hynds Hyseal Manhole Connecting Seals D4.7 Caliber Safety Grille D4.12 Large Hinged Manhole Covers D4.17 Accio 600 mm Clear Opening Manhole Cover and Frame D4.23 Impact Safety Grille D5.14 Scruffy Domes D10.2 Hybond Two Epoxy Mortar D10.1 Lifting Equipment D10.16 Aquawrap Fig. 7 Swiftlift Clutch Operation Don t sling in this orange area. Fig. 8 Sling Angles Note: Always aim to make sling length greater than the distance between two anchors. Branches Nationwide Support Office & Technical Services 09 274 0316 Disclaimer: While every effort has been made to ensure that the information in this document is correct and accurate, users of Hynds product or information within this document must make their own assessment of suitability for their particular application. Product dimensions are nominal only, and should be verified if critical to a particular installation. No warranty is either expressed, implied, or statutory made by Hynds unless expressly stated in any sale and purchase agreement entered into between Hynds and the user.