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Concrete Ring Manhole Chambers

JDP offers a complete range of precast concrete rings from DN 900 to DN 4000 in varying depths with tongue and groove joints manufactured to meet Design Chemical Class 4 as defined in BRE Special digest 1 'Concrete in aggressive ground' Part 4 : Design guides for specific precast products’.

Manufacturers Quality Assurance scheme in accordance with the European Standard enabling products in the range DN 900-3000 to be kitemarked.

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Concrete Manhole Rings

A constructed precast concrete manhole is a strong, durable structure with its own inherent strength and does not require a concrete surround.

DN Available Depth of Section Approx. Wall Thickness (mm) Approx. Weight/m Depth (kg)
0.25m 0.5m 0.75m 1.0m
900 70 530
1050 80 710
1200 90 912
1350* - 95 1080
1500 - 105 1330
1800 - 115 1760
2100 - 125 2140
2400 - 140 2740
2700 - 150 3400
3000 - 165 4140
3660* - - 185 5300
4000* - - 200 6360
* Not Kitemarked, but comply with all the relevant provisions of the European Standard. DN 4000 is supplied in 2 halves.

Polypropylene coated mild steel double steps to BS EN 13101:2004 are fitted to manhole sections when required. Stainless steel steps available upon request.

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Manhole chamber sections are supplied with nominal 50mm diameter holes for lifting purposes:

  • 2 no. holes in DN 1800 sections and below
  • 3 no. holes in DN 2100 sections and above

Shaft/chamber sections can be supplied:

  • with or without fixed double steps
  • perforated with 75mm diameter holes for use as in soakaways
  • with holes or cut outs
  • with bases cast in
Recommended minimum chamber diameters

Consult the table below to consider the recommended minimum chamber diameters to suit the pipe size.

Largest Pipe DN Chamber DN
< 375 1200
375 - 450 1350
500 - 700 1500
750 - 900 1800

Manhole Cover Slabs

Chamber DN Depth (mm) Overall DN Standard Access Sizes Weight (kg)
600 x 600 675 x 675 750 x 750 750 x 600 1200 x 675
900 150 1060 C C - - - 130
1050 150 1230 E E C To Order - 235
1200 150 1400 E E C E To Order 355
1350* 150 1560 E E To Order E C 475
1500 150 1730 E E To Order E C 790
1800 175 2050 E E To Order E E 1210
2100 180 2370 E E To Order E E 1745
2400 180 2700 E E To Order E E 2375
2700 205 3020 E E To Order E E 3335
3000 225 3350 E E To Order E E 4585
3660* 275 3960 To Order E To Order To Order To Order 7760
4000* 275 4500 To Order E To Order To Order To Order 10040
* Not Kitemarked, but comply with all the relevant provisions of the European Standard
Weights shown above reference 675 x 675 access products
C = Central Position    E = Eccentric Position    As defined in the British Standard
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Note:
  1. DN 900 and DN 1050 are the only slabs in which a 600x600 access complies with the European Standard
  2. All slabs detailed are Type 2
  3. Weights available on request as they are dependant on the access size
  4. Non standard slabs and accesses can be designed and supplied to order
  5. DN 3660 cover slab is supplied in 3 sections
  6. DN 4000 cover slabs can be supplied in 2 or 3 sections dependant on the opening required
  7. All accesses have 75 x 75 corner chamfers
  8. All cover slabs are "heavy duty" and are suitable for use in main roads

Reducing Slabs

Standard reducing slabs are available and supplied to suit the various chamber sections, from DN 1050 to DN 3000, and have a 900, 1050 or 1200mm diameter circular access. DN 3660 and 4000 reducing slabs are also available but are not covered by the European Standard.

Landing Slabs

Landing slabs to suit DN 1500 chamber section and above can be supplied with a 900mm circular access.

Preformed Chambers

Reducing construction time and resources required on site is a continual challenge and opportunity to manufacturers and distributors. JDP strive to be involved in the latest advances in new and existing materials and technologies which offer engineers solutions.

Preformed Manholes

Provides a sealed system for waste water management in mahole construction, replacing the need for the groundworker to form on site. Can also be used for surface water.

Features & Benefits
  • Creates an immediate watertight structure
  • Clean access for inspection, reduces maintenance and running costs
  • Accommodates all combinations and variations in entry / exit pipes
  • Reduced labour activity in manhole, improves safety
  • Eliminates material wastage associated with in-situ method
  • Eliminates effects of poor site practice and weather conditions
  • HDPE version can be made bespoke to full chamber height for a complete off site solution
  • Concrete version accepts manhole rings to create chamber

Preformed Catchpit

This chamber provides a sealed sump manhole which can be connected with adaptors to uPVC, twinwall, clay, ductile iron and concrete pipes.

Features & Benefits
  • Creates an immediate watertight structure
  • Limited wet trades required in manhole construction
  • Accommodates all types of pipes used in manhole construction
  • Reduced labour activity in manhole
  • Eliminates material wastage associated with in-situ method
  • HDPE version can be made bespoke to full chamber height for a complete off site solution
  • Concrete version accepts manhole rings to create chamber