Retaining Solutions

Precast Concrete Retaining Walls

For more than 60 years Bell & Webster have designed and manufactured an enviable range of products for prestigious clients in civil engineering, commercial, industrial, agricultural and utilities sector.

Early 1970’s saw the introduction to our Retaining Solutions sector, and today Bell & Webster is still a market leader in a wide range of concrete products. All of our retaining wall units are designed in accordance with Eurocode 2.

Bell and Webster Retaining Wall dimensions

Typical Corner Unit Sections
1000mm - 2500mm	1 piece
3000mm	2 piece
3750mm	4 piece

For corner configurations please refer to our technical brochure.

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Standard Sizes

Height mm	Width mm straight unit	Width mm corner unit(s)		Weight straight unit	Weight corner unit(s)
1000	1000	1000		394kg	686kg
1500	1000	1000		631kg	1046kg
1750	1000	1000		761kg	1230kg
2000	1000	1000		890kg	1400kg
2500	1000	1250		1316kg	2600kg
3000	1000	1500 sections 1 & 2		1740kg	2070kg sections 1 & 2
3750	1000	sections 1 & 2	1000 sections 3 & 4	2596kg	sections 1 & 2	2532kg sections3 & 4

The loading 18 kN/m3 is approximately a bulk density of 1800 kg/m3

Design Criteria

Designed in accordance with Eurocode: Basis of structural design (BS EN 1990:2002) and Eurocode 2: Design of concrete structures (BS EN 1992-1-1:2004) as well as BS 8110-1:1997. Concrete grade C35/45 to BS 8500-1:2006. Nominal cover to reinforcement is 45mm (minimum cover = 40mm + ΔC_dev = 5mm). Units designed to retain adequately drained material with a bulk density of 18kN/m³ on either or both sides – either level with the top of the wall with a maximum surcharge of 10kN/m² or at a maximum incline of 32.5º to the wall. If required weepholes can be formed during casting. It is usual to allow a 10mm joint as tolerance between units to absorb creep. Non standard angles and reduced width closer units can be supplied, consultation at design stage is recommended. Customised units can be manufactured within the range of standard sizes to suit specific applications.

Anchors for Standard Conditions

Unit	Minimum Embedment		Anchor Size
	Foundation (mm)	Unit (mm)	No. Type	Length (mm)
1000	125	115	2No. T.20	275
1500	125	124	2No. T.20	275
1750	125	130	2No. T.20	290
2000	125	133	2No. T.20	290
2500	200	151	2No. T.20	400
3000	200	165	2No. T.20	400
3000	200	165	2No. T.20	430
3750	200	195	2No. T.20	430
3750	200	195	2No. T.20	475

Stability

Anchors comprise of T.20 high yield deformed bar and two part polyester resin mortar e.g. Fosroc Lokset S. or equal used in accordance with the manufacturer’s instructions. Position the retaining wall units onto the concrete foundation and align using a mortar bed and shims as required. Using the 30mm diameter holes in the unit base as a guide drill into the foundation to the required depth. Pour sufficient mixed resin into the hole first then insert the T.20 bar so that it is just below the surface of the unit and completely encapsulated in resin. Important points to remember. Drill sufficient holes to allow the use of a complete batch of mixed resin; The mortar is placed in the hole first; Follow the resin manufacturer’s instructions for placing the anchor bars into the resin; When correctly fitted the bars should finish below the surface of the wall unit completely encapsulated in resin.

Foundations

The foundation requirements should be determined by a qualified engineer. Units placed on a concrete foundation should be bedded on mortar and wedged to attain correct alignment.