RODDING ACCESS

In areas where combined foul and surface water systems are permitted, the rainwater connections must be trapped. See Figure 21.

Concrete Floor Construction

FIGURE 21
TYPICAL LAYOUT USING RODDING
ACCESS COMPONENTS




USEFUL INSTALLATION TIPS

• Always chamfer cut pipe and lubricate all plain ended spigots for perfect joints.

• Storm water connections are invariably less critical than those in the foul system. Therefore lay the foul drain system closest to the building and lay the storm system around this wherever possible.

• Where external soil stacks are connected to the side inlet of a preformed chamber, ensure that the distance between the two is a minimum of 750mm to help prevent cross flow of solids onto the opposite benching.

• Where combined drainage systems are installed ensure each rainwater pipe is connected to a gully.

• Always use the main channel of a chamber at a change of direction of the main run.

FIGURE 22 - TYPICAL INSTALLATION (ENGLAND AND WALES) - SURFACE WATER SYSTEM


TRADITIONAL GULLY ASSEMBLY
The Low Trap Gully can be supplied in basic assembled form with a wide range of bends offering a choice of outlet. The hopper should be attached to the trap out of the ground, and the whole assembly should be placed on a ready-made concrete slab, connected to the main drain, and backfilled with a selected granular material.

If the assembly is not protected by pavings or concrete at ground level e.g. in a garden, then a concrete slab should be bedded above the outlet bend to prevent damage from garden implements, Figure 23.

FIGURE 23
TRADITIONAL GULLY ASSEMBLY


HORIZONTAL BACK INLET
ASSEMBLY
Figure 24 shows the use of the Horizontal Back Inlet Hopper when collecting waste water from inside a building.

Gully risers can be used with the whole range of square hoppers and bottle gully when extra depth is necessary. The rest of the gully assembly is as the aforementioned installation.

FIGURE 24
HORIZONTAL BACK INLET ASSEMBLY



BOTTLE GULLY ASSEMBLY

The unique round to square adaptor enables the gully outlet to be rotated leaving the grid square to the wall thus giving a more direct line of drainage.

The base design allows the gully to stand freely on a firm base of bricks or concrete without additional support.

It has three bosses all of which will accept a 110mm pipe when the need for the true back inlet arises.

Installation is completed by bedding and surrounding the gully with selected granular material, Figure 25.

FIGURE 25
BOTTLE GULLY ASSEMBLY


SOIL PIPE CONNECTION
(SHORT RADIUS)
Figures 26(a) and (b) show how to connect an
internal soil stack to an underground drainage
system using a two way knuckle bend.

FIGURE 26(a)
USUAL SOIL PIPE CONNECTION

Suitable were WC’s are connected to the soil stack, the rest bend 4131 should be used.



FIGURE 26(b)
SOIL PIPE CONNECTION (SHORT RADIUS)
Suitable were WC’s are not connected to the soil stack. The pipe is then taken to ground level and connected to the stack with a coupler.



SOIL PIPE CONNECTION
(LONG RADIUS)

Figure 27 again shows the connection of underground drain to soil by the use of a long radius bend connected together with two couplers.

It is advisable to use a long radius bend when heavy or fast flows are expected e.g. flats (multi-storey dwellings).



RAINWATER PIPE CONNECTIONS
If rainwater pipes are to be situated externally then connections can be made by fitting a rainwater pipe adaptor to a pipe and via a knuckle bend as shown in Figure 28. Should the system be combined the rainwater pipe would have to be dropped into a trap assembly similar to that shown in Figure 23.

FIGURE 28
RAINWATER PIPE CONNECTIONS



SADDLE BRANCH

BRANCH ENTRIES
To make new connections to existing 110mm and 160mm PVCu drains insert a suitable Junction and Slip Couplers.

To insert a new branch entry into larger diameter drains use a Saddle Junction, Solvent Weld is available in the Brett Martin range.

Solvent Weld Saddle Junctions are supplied in 110mm and 160mm sizes for 45° and 87 1 /2 ° Branch entries and 200mm for connection at 45º.


FIGURE 29
200mm X 110mm CONNECTIONS AT 45° USING SOLVENT WELD JUNCTION ON 200mm DRAIN




PIPE JOINTS
The Brett Martin Drainage system includes Adaptors to connect PVCu to clay or cast iron sockets or spigots. These connections are illustrated in Figures 30-33.

FIGURE 30
PVCu STANDARD CLAY ADAPTOR (3500)

FIGURE 31
PVCu SUPER CLAY ADAPTOR (3510)



FIGURE 32
S.G.ADAPTOR (SOCKET) TO FIT CLAY
SOCKET (5131/7161)



FIGURE 33
S.G.ADAPTOR (SPIGOT) TO FIT CLAY
SPIGOT (5141/7151)

CUTTING
Pipes can be cut with a hand saw having 6-8 teeth per cm, held at a shallow angle and sawing with slow steady strokes. A file should be used to remove any swarf and a chamfer should be made around the full circumference of the pipe.

PUSH-FIT JOINTING
To ensure watertight jointing the following procedure should be followed:

• Pipe ends should be cut square. Chamfer the end to approximately half the wall thickness and at an angle of about 15° using a file or rasp. Remove all swarf with a scraper or knife blade. Chamfers are moulded on spigot ends of all fittings.



• Check all seals, sockets on pipes and fittings and pipe ends, for a distance equivalent to socket depths, are clean.

• Apply Brett Martin lubricant around the pipe end or spigot end of fittings - not around the ring seals.

• Align components and push the pipe end or fitting spigot fully into the ring seal socket to the depth of entry mark; mark the pipe or fitting spigot at the socket face.



• Withdraw the pipe or spigot until the mark is 10mm away from the socket face: this creates a thermal movement allowance within the socket.



Make a subsequent check to ensure that the expansion gap is not lost during further installation work.