Welcome to www.pretread.com, home page for neoprene bridge bearing, laminated elastomeric bearing pads, ptfe Teflon sliding bearings,pot bearings,ptfe Teflon high damping
rubber bearings, lead rubber bearings,installation of bearings, moulded rubber products, bearing, bearings, rubber,bridge,elastomer,elastomeric,laminated,sliding, neoprene,ptfe,
laminated,pads,pad,bearing installation, installation of bearings, products from Dubai in UAE.
Our laminated elastomeric bearings have been approved and used as Temporary bearings for launching pads as well as Permanent bearings for rail tracks. Click
images to get more details on Dubai Rail Project
Palm Jumerah Mono Rail Project
Another feather on our hat
Laminated Elastomeric Bearings and sound proofing elastomer floorings for Palm Jumerah Mono Rail Project were supplied by us.
Many of general Frequently Asked Questions (FAQ) on laminated bearings, slide bearings and pot bearings are answered in this page. Your suggestions and
comments about this page will be highly appreciated so we could serve you better. Please email us comments and suggestions. (use the right side task bar to go to
next Question)
We reguest you to feel free to send any other questions on lamainted elastomeric bearings, pot bearings as well as ptfe teflon sliding bearings to us and will
be glad to answer you or assit you in your requirements
Neoprene bridge bearings - plain or laminated - elastomeric bearings are much easier to install in a bridge than compared to other types of bearing used and
elastomeric bearings require nil maintenance. Unlike most other elastomer, Neoprene rubber under-goes no marked stiffening at low temperature when the thermal
contraction of the bridge deck is at maximum. Such stiffening could be deleterious to bearing and / or structure. Correctly-designed and suitably-compounded
laminated Neoprene Rubber bridge bearings can be confidently expected to function efficiently for at least a decade even at different high variances of
temperature.
As efficient bearing plates for pre-cast, pre-stressed concrete or steel beams in bridges and buildings, Neoprene Pads - plain and laminated - manufactured by
us permits a smooth and uniform transfer of load from the beam to the substructure and allow beam rotation at the bearing due to deflection of beam under load.
They further allow lateral and longitudinal movement of the beam caused by thermal forces. Neoprene Pads have no movable parts and thermal expansion and
contraction are absorbed by the pad's ability to give and take in shear. There is no sliding motion between pad and beam or between pad and abutment.
The material specifications for the elastomeric bearing shall meet all current requirements of AASHTO M 251.Bearing pads and elastomeric bearings will comply
with Articles 18.2.3 through 18.2.6 of Section 18, Bearing Devices, Division II, Construction, of the AASHTO Standard Specifications for Highway Bridges. Bearing
pads and laminated bearings shall be of compound known as neoprene and shall be cast in molds under pressure and heat. A plain elastomeric bearing pad and steel
load distribution plate combination shall be classified as a laminated elastomeric bearing. Test specimens shall be in accordance with ASTM D 3182 or D 3183. Where
test specimens are cut from the finished product, a 20 percent variation from original physical properties is allowed.
Elastomeric bearings shall be composed of multiple laminates of elastomeric material separated by steel reinforcing. The overall size of the bearing, number of
laminate and thickness of laminates are designed in accordance to requirement of Load to be Transferred. Bearings having steel plates as reinforcement shall be
cast/compression moulded/vulcanized as a single unit in a mould under pressure and heat.
Internal plates shall be ASTM A 36/A 36M or A 570/A 570M, Grade 36 or Grade 40. All plates shall be deburred. The internal plates shall not be less than 1.88
mm (0.074 inch) thick. The steel plates separating elastomeric layers will be completely bonded by vulcanization to elastomeric material on all surfaces
using special metal to rubber bonding adhesive. All external load bearing steel plate(s) if present, shall be factory vulcanized to the elastomeric bearings during
the primary molding process through hot vulcanization.
Acceptance Tests of the pads and bearings shall be according to Level I acceptance criteria of Article 18.2.5. This testing shall be included in the price bid
for the bearings.
Yes, Mechanical bearings are also manufactured and supplied by us and further investments for plant up-gradation is under way. Please send us your requirement
for Pot Bearings
In house Quick Production Test of all bearings shall be done at Clients/Representative presence. Tests confirming to AASHTO specification in accordance with
Acceptance Testing on either Level I or Level II or Short/Long-Duration Compression Test up to 3400 kN with horizontal shear up to 300 kN can be carried out in our
facility.
Neoprene or Polychloroprene Rubber Compounds are used where Laminated Elastomeric bearings are designed, manufactured and tested in accordance to requirements
with AASHTO M 251 .
Natural Rubber Compounds are usually used where Laminated Elastomeric bearings are designed, manufactured and tested in accordance to requirements with
BS 5400 Part 9 as well as EN 1337 unless otherwise specified by Client / Consultant.
www.pretread.com you have your single reliable source for all your requirements of sliding bearing,expansion joints neoprene pads, manufactured from
Polychloroprene. Even for building bearings, expansion joints, elastomeric bearings, shock absorber mountings,and custom bridge bearings, manufactured to your
specification, with approval from American Association of State Highway and Transportation Officials. Our PTFE laminated elastomeric bearings,bridge bearings,
isolation pads,seismic isolators, and pot bearings are manufactured complying to US road transportation authority specifications.
Yes, we could assist you in verify load calculations for your bearings. Send us sizes, construction and load details of your bearings and we will send results
on design parameters compared to AASHTO LRFD. Click to
see sample report
Yes, we are the first manufacture to produce ptfe -TEFLON sliding bearings successfully in the middle east. Various projects have been supplied with our ptfe
-Teflon sliding bearings and will be glad to provide references on these Projects.
When horizontal movements are expected at high values over 50 mm and the vertical shear is low instead of using a thicker laminated bearing, it would be ideal
to use a ptfe sliding bearing with SS 316 mirror finish for a smoother long term application.
Yes we have in house facility to design and manufacture pot bearings,Fixed pot bearings, Guided Sliding pot bearings and Free Sliding pot bearings. These are
designed and manufactured to AASHTO standards.
Yes we can supply you with additional accessories and fixtures for installation of pot bearings like temporary bearings, ptfe sliding bearings, studs, base
plates, masonry plates etc to AASHTO specifications as well as bearing instaltion methodology meeting AASHTO / BS / EN 1337 norms.
Due to sesemic design requirements, when lateral movements required for structure are of greater values than the height of bearing it would be ideal to
use a ptfe-TEFLON sliding bearing which provide a very low friction coefficient between ptfe and Stainless Steel surface which will be less than
0.05 .Also ptfe - teflon bearing provide a service life over 50 years.
Yes, we are the only manufacturer in Middle East who has in-house facility to test Laminated Bearings / Pot Bearings by applying Vertical Load and
Lateral Shear to confirm that Shear Modules confirms to specified for bearing designing. In our test facility bearings can be tested to any higher values and this
facility provides structure designes more confidence on their own bearing designs.
Internal Lamination construction of Elastomeric Bearings are designed based on required Vertical Load /Lateral Shear, keeping Shear Modules value of rubber
compound as required by Client / Bearing designer. Only through results obtained from Stress Strain Tests and graph plotted will prove that bearing manufactured
meets the required values for Lateral Shear under vertical load. We are the only manufacturer in Middle East who has in-house facility to carry out these tests and
confirm that Laminated Bearings manufactured by us meets the design parameters.
Clients / Consultants are welcomed to witness these tests and see our facility to test Laminated Bearings up to 3400 kN Vertical Load and Lateral Shear Load of
180 kN ( which can be increased to 300 kN) and a lateral movement of 100 mm.
To be qualified as an approved and caipable manufacturer of laminated elastomeric bearings meeting EN 1337 norms effective from 2004, every lamianted
elastomeric bearing manufacturer have to manaufacture and test certain sizes of bearings winessed by an accredited 3rd party independent agency . The
largest size as per EN 1337 requirement is 700x600x160 mm.
Yes, pretread.com have manaufactured and tested laminated elastomeric bearings meeting EN 1337 norms and these bearings manaufactured by us have been
tested and certified by tests winessed by an accredited 3rd party independent agency in UAE and Spain in 2007.
Yes, pretread.com will be glad to provide copy of approvel of laminated elastomeric bearings tested to meet EN 1337 norms certified by tests winessed by an
accredited 3rd party independent agency from UAE and Spain.
Let us help you to design your requirements of elastomeric
bearings. Please click on the links to
visit our form fill up page and we can design bearings to
your requirement
To our competitors.
it is noticed that contents from our site has been printed and circulated, please refrain from copying information
from this site, today what we are is from years of our dedicated services to construction industry... buildings and bridges are not only profit making
business, but part of infra structural growth of human lives, which has to be taken care by us.
Disclaimer.
The data and commentary contained within this website is for general information purposes only and is provided without warranty of any kind.
www.pretread.com shall not be held responsible for any errors, omissions, or misuse of any enclosed information and hereby disclaims any and all liability
resulting from ability or inability to use information contained herein. Anyone making use of this material does so at his or her risk. In no event will
www.pretread.com. be held liable for any damages including lost profits, lost savings, or other incidental or consequential damages arriving from the use or
inability to use information contained within. www.pretread.com suggests to contact us for suitability for a particular application in rubber products.
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Bearing Load Testing.
Ours is the first and only laminated bearing manufacturing facility in Middle East to have an in-house
laminated bearing load testing facility to carry out tests confirming to AASHTO specification in accordance with Acceptance Testing on either
Level I or Level II as well as Short/Long-Duration Compression Test. Our bearing testing machine can test bearings to Vertical load of 4200 kN with
horizontal shear load up to 400kN and at lateral shear movement to 100 mm.
Laminated Elastomeric Bearings manufactured by us have passed Initial Type Test as mandatory to Europan Norms meeting EN 1337-3: 2005 on Bearings
I, II, & III sizes equaling to CE Certification in Middle East. 3rd Party witnessed Certification is available on request.
Bearing Load Calculations
We could verify ..load calculations.. for your bearings. On receipt of corbel size, load and
movement details of your requirements, calculations and bearings sizes can be provided based on results on design parameters compared to AASHTO LRFD
and well as EN 1337;3-2005. Laminated Elastomeric Bearing sizes are ..permuted.. to find right bearing
for your application. We do not just follow a typical catalogue.
Dealer ship and agency offered, please contact us with details on your organization,current activities and area of interest. Send us an email to:
pretread@eim.ae
Bearing Design
Let us help you to design your requirement of elastomeric bearings click on the links to visit Design a
Bearing Form- - we can support you to design laminated elastomeric bearings to requirement
Thank you very much for visiting www.pretread.com home page for neoprene bridge bearings, manufacturer, elastomeric bridge bearing, pads, high
damping rubber bearing, molded products, bearing installation, bearing installation, PTFE sliding bearing pads ptfe Teflon sliding,laminated,
pipe supports, from Dubai in UAE and we suggests to contact us for your particular application.
