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CONCRETE PIPES

Atlantic Concrete’s culverts are produced by state of the art machinery to meet requirements in drainage systems, sanitary sewer systems and general construction.  Produced in accordance with the BS Code 5911, the concrete pipes are equipped with joint designs to provide the following performance characteristics:

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  • Resistance to infiltration of groundwater and backfill material
  • Resistance to exfiltration of sewage or storm water
  • Ability to accommodate lateral or longitudinal movements
  • Strength to handle shear or vertical movement
  • Pipeline continuity and smooth flow line
  • Allow infiltration of groundwater for subsurface drainage
  • Ease of installation
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The precast concrete pipes mix ratios include proportions of 10 mm, 14 mm, 0 – 7 mm aggregates and water to cement ratio of within 0.39 – 0.53 guaranteed to produce concrete pipes of high strength and durability.

The concrete pipes produced are categorized into two main types, according to the joint design, viz:

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  • The Spigot & Socket Joint Type
  • The Half Thickness Joint Type

The Spigot and Socket Joint Culverts

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These have a total pipe length of 2500 mm and an effective length of 2400 mm. They have opposing shoulders, the bell (socket) and the spigot, that accommodate all forms of sealing viz, rubber gaskets for effective sealing as well as preformed flexible joint sealants or mortar for lesser performance requirements. The following table spells out a few specifications:

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DIAMETER

PIPE THICKNESS

TONNAGE (tonnes)

300 mm (12”)

95 mm

0.45

450 mm (18”)

114 mm

0.73

600 mm (24”)

138 mm

1.03

1000 mm (40”)

100 mm

2.68

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The figures on the right are diagrammatic representations of a typical spigot and socket joint pipe:

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Figure 1 shows an isometric view of a typical spigot and socket joint concrete pipe

Figure 2 is a transverse section of the said pipe depicting the following:

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  • -  Total length of the pipe
  • -  Effective length of the pipe
  • -  Internal Diameter ID of the spigot and bell section of the pipe
  • -  Outer Diameter OD of the spigot and bell section of the pipe

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FIG. 1

FIG. 2

Half Thickness Joint Pipes

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These mass concrete pipes have a total length of 1000 mm. Their opposing ends, a tongue and a groove, ensure a strong joint during laying. Bituminous and butyl sealants or mortar can be employed for effective sealing and provide excellent pipe-to-pipe bond during installation.

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DIAMETER

PIPE THICKNESS

TONNAGE

450 mm (18”)

42 mm

0.17

600 mm (24”)

85 mm

0.28

900 mm (36”)

75 mm

0.53

1200 mm (48”)

90 mm

0.95

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Fig. 3 is a cross- sectional view of a typical half-thickness joint pipe exhibiting its effective length, total length as well as the inner and outer pipe diameters.

Our pipes are produced to meet the SANS 677 standard- no internal pressure applications – Class 75D. Tabulated below is information

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Nominal Diameter (mm)

Inside Diameter (mm)

Outside Diameter (mm)

Wall Thickness (mm)

Socket Depth (mm)

Mass (kg/unit)

Proof Load (kN/m)

Ultimate Load (kN/m)

300

331

339

95

13

450

22.5

28.1

450

485

491

114

15

730

33.8

42.2

600

646

659

138

24

1030

45

56.3

900

930

935

75

30

530

67.5

84.4

1000

1069

1094

100

31

2680

75

93.8

1200

1236

1240

90

33

950

90

112.5

FIG. 3