Bridge bearing displacement,equipment vibration reduction failure and substandard isolation layer performance—these engineering hazards usually stem not from rubber pads themselves,but poor control over construction details.Installing rubber pads is far more than simply laying them in place.From material selection matching,bearing pad preparation,positioning and installation to post-construction re-inspection,every procedure follows clear technical specifications and contains easily overlooked pitfalls.Rigorous construction workmanship forms the true guarantee of engineering quality.
Material Selection:The First Barrier for Construction Quality
Rubber pad construction quality begins at the material selection stage.Material type sets the upper limit of performance.Natural rubber delivers excellent resilience and suits most general applications;nitrile rubber features outstanding oil resistance for oily workshop environments;neoprene offers superior weather resistance and works well for outdoor or humid working conditions.Hardness selection is equally critical.Insufficient hardness causes excessive equipment shaking,while overly high hardness leads to full compression of rubber and loss of elasticity,transmitting vibration straight to the base structure.Thickness is not positively correlated with performance.Thinner pads fit light-duty equipment,while thickened or multi-layer assemblies are required for heavy-duty equipment.With over 40 years of technical expertise in this sector,Jingdong Rubber Co.,Ltd.supplies a complete product range covering natural rubber,nitrile rubber,EPDM and other materials.We select suitable rubber grades tailored to operating conditions such as oil contamination,temperature and humidity to secure quality starting from raw material matching.
Bearing Pad Treatment:The Overlooked Foundation
Bearing pads serve as the load-bearing base for rubber pads.Improper bearing pad preparation renders even high-grade rubber pads ineffective.The top surface of bearing pads shall be chiselled and cleared of loose sand to ensure a clean and flat surface.Bearing pads should be roughly 10 cm larger than the bearings,with a height over 6 cm to reserve adequate space for jack operation.The top surfaces of multiple bearing pads under a single beam must lie on the same plane.Otherwise,eccentric compression and initial shear stress will occur,drastically shortening the service life of rubber pads.
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Positioning and Installation:Precision Governs Performance
Precision control in installation directly determines whether rubber pads can function as designed.Bearing positions must be measured and inspected before installation.The parallelism deviation between the mounting plane and sliding plane shall not exceed 2‰.After installation,rolling and sliding planes shall remain horizontal,and the centring deviation of upper and lower plates shall also be kept within 2‰.To guarantee flat installation,a 20–50 mm thick dry non-shrinkage mortar bedding shall be cast between the bearing base and the top of the bearing pad.
Multi-layer Stacking:Lateral Stability Must Not Be Neglected
Multi-layer stacked rubber pads are adopted for certain heavy-duty equipment.Thin metal sheets shall be inserted between each layer.The overall height shall not exceed the pad width;otherwise,lateral stability will decline markedly.
Subsequent Re-inspection:Rubber’s Viscoelastic Deformation Property
Engineers need to recognise the viscoelastic deformation characteristic of rubber materials.Under sustained load,vibration isolation pads gradually produce permanent deformation.Equipment levelling recalibration is generally needed roughly two weeks after installation.This is not a product defect but an inherent property of rubber.Jingdong Rubber optimises this characteristic at the formulation stage.By adjusting crosslink density and filler systems,we minimise long-term compression set while preserving resilience.All products are tested for dynamic-static stiffness ratio prior to delivery,ensuring performance attenuation stays within an acceptable range both at initial installation and after prolonged service.
Rubber pad construction technology may appear simple,yet each step underpins engineering quality.Matching materials to working conditions,preparing flat and qualified bearing pads,maintaining precise installation and carrying out timely re-inspection—these four interconnected steps allow rubber pads to reliably withstand every load and vibration.Jingdong Rubber Co.,Ltd.has specialised in this industry for more than 40 years.We have participated in drafting multiple national and industrial standards including Industrial Rubber Sheets and Electrical Insulating Rubber Sheets,and hold ISO9001,ISO45001 and ISO14001 certifications.Leveraging our technical capability as a standard formulator,we deliver reliable product support throughout every construction stage.
Jingdong Rubber Co., Ltd. is a professional rubber sheet manufacturer, producing silicone rubber sheet, natural rubber sheet, fluorine rubber sheet, neoprene rubber sheet, insulating rubber sheet,EPDM rubber sheets, oil-resistant rubber sheets, anti-static rubber sheets, flame-retardant rubber sheets, conductive rubber sheets, anti-slip rubber sheets, and cowshed mats, etc. with over 40 years of industry experience, are popular both at home and abroad. If you need any of our products,please send emails to sales@jingdongrubber.com.