Plain Bridge Bearing Pad:

The Elastomeric Plain Bridge Bearing Pad is currently utilized in Scaffolds, Flyovers, Structures, Railroads, and Atomic Power Reactor Plants because of their unrivaled working exhibitions. According to client requests and the necessities of tasks, we can convey Elastomeric Heading in state of chamber, squares or square shape. Our Elastomeric Heading are outmatch in every single viewpoint as per the norms of AASHTO M-251, EN-1337-3, BS-5400, KS-4420, Noise 4141 to meet the necessities of our clients.

 

DESIGN PATTERN

Elastomeric plain Bridge Bearing pad are planned in layers and manufactured in Water driven trim machine. They are made out of CR (Chloroprene Elastic) regularly known as Neoprene Elastic or NR (Normal Elastic). In the assurance of the shape factor utilized in the calculation cycle, a wellbeing factor is consolidated to guarantee a sensible connection between’s the determined compres-sive firmness esteem and the genuine test esteem. The CR bearing cushion is appropriate for conditions where the temperature goes from – 25 °C to 60 °C. Assuming the functioning temperature goes from – 40 °C to 60 °C, you can pick the NR for natural substance.

HOLES

Openings can be given according to necessity of planner. Uniquely formed modules with subset or counter drilled openings are likewise accessible on exceptional solicitation. These are once in a while utilized as a way to hold upward orientat-ed cradle bearing cushions ready. In the event that requiring openings in heading if it’s not too much trouble, obviously aspect these on the undertaking cross segment drawings.

 

TOLERANCES

Hardness Shore A 50, 60, 70 Duro     +/- 5 Points  Length      +/- 5mm

Width  +/- 3mm

Thickness         +/- 1mm

Standard Thicknesses

Standard Thicknesses Standard thicknesses are – 3, 6, 10, 13, 20, & 25mm.

Other thicknesses are available but by special demand only

 

ELASTOMER PHYSICAL AND MECHANICAL PROPERTIES

 

DESIGN LIFE

Natural Rubber (NR) or Chloroprene Rubber (CR) commonly k

nown as Neoprene Rubber Elastomeric Bearings have a reliable proven design life of at least 50 years with no need of maintenance

FRICTION CO-EFFICIENT VALUES

RUBBER AGAINST INTERFACE (INDICATIVE)

Wood Floated Concrete	0.35
Steel Floated Concrete	0.30
Concrete cast in situ against elastomer	0.25
Hot-dipped galvanized surfaces	0.08

 

Part Number	Cross Section (mm)	Maximum Working load (kN/m) SLS	Maximum Shear Deformation (mm)	Compressive Stiffness (kN/mm per metre of strip)	Shear Stiffness (kN/mm per metre of strip)	Rotation (Rads.) Maximum #
EBS-50-3/…… *	50 x 3	250	1.5	1278	15.0	0.011
EBS-75-3/…… *	75 x 3	375	1.5	2750	22.5	0.005
EBS-100-3/…… *	100 x 3	500	1.5	4778	30.0	0.003
EBS-125-3/…… *	125 x 3	625	1.5	7361	37.5	0.002
EBS-150-3/…… *	150 x 3	750	1.5	10500	45.0	0.001
EBS-50-6/…… *	50 x 6	200	3	347	7.5	0.036
EBS-75-6/…… *	75 x 6	375	3	750	11.3	0.020
EBS-100-6/…… *	100 x 6	500	3	1278	15.0	0.011
EBS-125-6/…… *	125 x 6	625	3	1944	18.8	0.007
EBS-150-6/…… *	150 x 6	750	3	2750	22.5	0.005
EBS-75-10/…… *	75 x 10	280	5	281	6.8	0.040
EBS-100-10/…… *	100 x 10	500	5	500	9.0	0.030
EBS-125-10/…… *	125 x 10	625	5	750	11.3	0.020
EBS-150-10/…… *	150 x 10	750	5	1050	13.5	0.014
EBS-200-10/…… *	200 x 10	1000	5	1800	18.0	0.008
EBS-75-13/…… *	75 x 13	215	6.5	166	5.2	0.052
EBS-100-13/…… *	100 x 13	385	6.5	296	6.9	0.039
EBS-125-13/…… *	125 x 13	600	6.5	462	8.7	0.031
EBS-150-13/…… *	150 x 13	750	6.5	648	10.4	0.023
EBS-200-13/…… *	200 x 13	1000	6.5	1101	13.8	0.013
EBS-100-20/…… *	100 x 20	250	10	125	4.5	0.060
EBS-125-20/…… *	125 x 20	390	10	195	5.6	0.048
EBS-150-20/…… *	150 x 20	560	10	281	6.8	0.040
EBS-200-20/…… *	200 x 20	1000	10	500	9.0	0.030
EBS-250-20/…… *	250 x 20	1250	10	750	11.3	0.020
EBS-100-25/…… *	100 x 25	200	12.5	80	3.6	0.075
EBS-125-25/…… *	125 x 25	310	12.5	125	4.5	0.060
EBS-150-25/…… *	150 x 25	450	12.5	180	5.4	0.050
EBS-200-25/…… *	200 x 25	800	12.5	320	7.2	0.037
EBS-250-25/…… *	250 x 25	1250	12.5	500	9.0	0.030
EBS-300-25/…… *	300 x 25	1500	12.5	696	10.8	0.021

 

 

Examples:

EBS-300-25/8000 = 8 meter long run of 300mm wide x 25mm thick elastomeric bearing strip module set start to finish. EBS-250-20/638 = single elastomeric Plain Bridge Bearing pad cushion 638mm long x 250mm wide x 20mm thick. Plan sizes beyond the table aspects are likewise generally speaking promptly accessible,

for instance:

EBS-400-13/400 = single elastomeric bearing Pad 400mm long x 400mm wide x 13mm thick.

VERTICAL LOADS

The loads displayed in the table represent the maximum suggested operating/functionality loads, at the maximum shear deformation shown. We choose elastomeric orientations based on workability loads rather than extreme design loads. Elastomeric course can endure huge over-burdening during extreme cutoff state cases without hurt thus this models doesn’t administer.

COMPRESSIVE STIFFNESS

The values displayed in the table represent hypothetical determined values. They are considered sensible normal values for determining the rotational limit. Frictional attributes of the contact surfaces against which the cushion/strip is placed, such as rough concrete or galvanized steel, will impact the actual values achieved in support. The expansion of a hole(s) into the cushion or strips will cause a huge expansion in compressive diversion at the evaluated load togeth-er with a comparing decline in load limit.

SHEAR DEFORMATION / MOVEMENT

Shear solidness values shown are +/ – from unbiased position. One might expect that a strip/pad with dowel pin openings, and therefore not exposed to shear distortion, has a load-carrying capacity determined by values presented in the table for the considered bearing strip/pad bearing.

 

ROTATION

Referring to the shifting of the load-bearing surfaces relative to each other as revolution. The models for rotational limit is that the following edge of the pad doesn’t go into strain, ie. No hole, yet that it is dependably under a level of pressure. Rotational limit recorded in the table is that appropriate at suggested greatest burden.

The relationship Burden/ROTATIONAL Limit is sensibly direct. Furthermore, when determining the required rotational limit of the strip/pad, one should consider constructional mistakes of the seating and/or camber, hoard, and so on, of shafts. While with covered elastomeric course it is unfortunate to have lift-off or loss of full contact because of rotational impacts, with plain elastomeric heading a level of takeoff, if it is negligible, won’t harm the item.

 

INSTALLATION

Non-built up strips/pads will spread when stacked. In this way, the help region should be more noteworthy than the ostensible arrangement size of the strip/ pads. We would suggest a base worth of 25mm on all edges of the strips/pads, especially in the event that the construction is steel. In the event that substantial, the suggestion is 25mm all around. If you’re using a mortar cushion, we propose a minimum thickness of 10mm along with a 45° chamfer on the sides of the mortar pad. On the off chance that the mortar platform is more prominent than 25mm, support might be vital. It would be ideal for surfaces to be level, liberated from depressions/projections, and ideally harsh wood float finish in.

 

PROPERTIES OF ELASTOMER

Temperature Impact – Inside the scope of – 20°C to +80°C no critical variety in execution will happen.

Ozon” – Ozone breaking in any elastomer will happen where there are surface tractable powers. In the case of breaking happens, it is regularly innocuous. It is just easing the surface strains and further, further, breaking is impossible.

Due in part to their small surface area to volume ratio, and particularly the limited exposure to the environment during use, bearing strips/pads made of high-quality natural rubber will typically provide a very long lifespan—often exceeding that of the structure itself.

Imperviousness to fire – Blocks of normal elastic don’t consume without any problem. However, in the event that imperviousness to fire is viewed as fundamental, to dispose of mellowing issues, sheathing with a reasonable fire retardant, or insulat-ing material, froth and so on, is proposed. On the other hand, plan to limit any settlement on the off chance that annihilation by fire would lead to underlying issues.