For neoprene bridge bearings, ptfe sliding bearings, pot bearings
Wednesday, June 21, 2006
Welcome to www.pretread.com, home page for neoprene bridge bearing, laminated elastomeric bearing pads, ptfe sliding bearings, moulded rubber products, high damping bearings, plain ptfe, bridge steel bearings, pretread, from Dubai in UAE.
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Bridge Bearings - Frequently Asked Questions.
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Many of the 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)
1. What are Laminated Neoprene Elastomeric Bridge bearings?
2. Explain further on advantages of Neoprene Elastomeric bearings to block of rubber.
3. Explain on neoprene bridge bearing specifications to AASHTO and other specifications.
4. Explain on Manufacturing procedure - Compression moulding:
5. Explain on Internal Laminates or MS Shim?
6. What is Bearing Acceptance Tests?
7. Do you manufacture Mechanical Bridge Bearings or Pot Bearings?
8. Do you carry out Testing of Neoprene Bridge Bearings?
9. Which is the Polymer( rubber) specified in AASHTO Specification?
10. Which is the Polymer( rubber) specified in BS 5400?
11. Advantages in sourcing Bearings and other rubber products from pretread.com?
12. Can we get help from www.pretread for Bearing Load Calculations
13. Does www.pretread.com manufacture and supply ptfe -teflon sliding bearings ?
14. What are the advantages on ptfe sliding bearing .?
15. Can we get help from www.pretread for PTFE-TEFLON sliding bearing designing?
16. Does www.pretread.com manufacture pot bearings, does you have in house facility for pot bearing designing?
17. Does www.pretread.com provide additional accessories and fixtures for installation of pot bearings like temporary bearings, ptfe sliding bearings, studs, base plates, masonry plates etc ?.
18. Does www.pretread.com design and manufacture ptfe-TEFLON sliding bearings ?.
19. What are the advantages of ptfe-sliding beairngs ?
20. Does www.pretread.com carry out testing on Laminated Bearings?
21. Does www.pretread.com carry out testing on Teflon Sliding Bearings?
22.Explain on Shear Modules of Rubber Compound - value used for bearing design and relation with result obtained from Stress Strain Tests?
23.Can these tests be witnessed by Client.
1. What are Laminated Neoprene Elastomeric Bridge bearings?
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.
2. Explain further on advantages of Neoprene Elastomeric bearings against block of rubber.
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 deflect ion of the 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.
3. Explain on neoprene bridge bearing specifications to AASHTO and other specifications.
The material specifications for the elastomeric bearing shall meet all the current requirements of AASHTOM 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 the 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 the original physical properties is allowed.
4. Explain on Manufacturing procedure - Compression moulding:
Elastomeric bearings shall be composed of multiple laminates of elastomeric material separated by steel reinforcing. The overall size of the bearing, the number of laminate and thickness of laminates are designed in accordance to the 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.
5. Explain on Internal Laminates or MS Shim?
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 the elastomeric layers will be completely bonded by vulcanization to the 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.
6. What is Bearing Acceptance Tests?
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.
7. Do you manufacture Mechanical Bridge Bearings or Pot 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
8. Do you carry out Testing of Neoprene Bridge 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 180kN can be carried out in our facility.
9. Which is the Polymer( rubber) specified in AASHTO Specification?
Neoprene or Polychloroprene Rubber Compounds are used where Laminated Elastomeric bearings are designed, manufactured and tested in accordance to requirements with AASHTO M 251 .
10. Which is the Polymer( rubber) specified in BS 5400?
Natural Rubber Compounds are used where Laminated Elastomeric bearings are designed, manufactured and tested in accordance to requirements with BS 5400 Part 9.
11. What are the advantages in sourcing Neoprene Bearings and other rubber products from www.pretread.com?
www.pretread.com you have your single relayable 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.
12. Can we get help from www.pretread for Bearing Load Calculations
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
13. Does www.pretread.com manufacture and supply ptfe -teflon sliding bearings ?
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.
14. What are the advantages on ptfe sliding bearing ?
When horizontal movements are expected at high values over 50 mm and the vertical shear is low instead of using a thicker lamianted bearing, it would be ideal to use a ptfe sliding bearing with SS 316 mirror finish for a smoother long term application.
15. Can we get help from www.pretread for PTFE-TEFLON sliding bearing designing?
Yes, we will be happy to do designing of ptfe sliding bearings for you, and please send us the details.
16. Does www.pretread.com manufacture pot bearings, does you have in house facility for pot bearing designing?
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.
17. Does www.pretread.com provide additional accessories and fixtures for installation of pot bearings like temporary bearings, ptfe sliding bearings, studs, base plates, masonry plates etc ?.
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.
18. Does www.pretread.com manufacture ptfe-TEFLON sliding bearings ?.
Yes we do design,manufacture and support in installations of ptfe -TEFLON sliding bearings.
19. What are the advantages of ptfe-sliding bearings ?
When the 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 and the friction coefficient between ptfe and Stainless Steel surface is less than 0.05 the service life of the bearings will be normally over 50 years.
20. Does www.pretread.com carry out testing on Laminated Bearings?
Yes, we are the only manufacturer in Middle East who has in-house facility to test Laminated Bearings / Pot Bearings applying Vertical Load and Lateral Shear to confirm that Shear Modules confirms to specified for bearing designing.
21. Does www.pretread.com carry out testing on Teflon Sliding Bearings?
Yes on our in-house Bearing Testing Machine can be used to test Teflon Sliding Bearing to note lateral sliding on required vertical loads.
22.Explain on Shear Modules of Rubber Compound - value used for bearing design and relation with result obtained from Stress Strain Tests?
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.
23.Can these tests be witnessed by Client.
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 and a lateral movement of 100 mm.
To view: List of Plain Neoprene Bridge Bearing manufactured by us, Plain Elastomeric Bearings: Sizes and physical properties
To view: List of Laminated Elastomeric Bearings manufactured by us Laminated Elastomeric Bearings: Sizes and physical properties in .pdf printable format
To view: List of Laminated Neoprene Bridge Bearing manufactured by us to DIN 4141 Part 14 Laminated Elastomeric Bearings to DIN 4141 Part 14: Sizes and physical properties
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
Thank you very much for visiting us.
Welcome to www.pretread.com, home page for neoprene bridge bearing, laminated elastomeric bearing pads, ptfe sliding bearings, moulded rubber products, high damping bearings, plain ptfe, bridge steel bearings, pretread, from Dubai in UAE.
www.pretread.com
PTFE_Teflon PadsPTFE Sliding Bearings
Welcome to www.pretread.com, home page for neoprene bridge bearing, laminated elastomeric bearing pads, ptfe sliding bearings,pot bearings,ptfe high damping rubber bearings, lead rubber bearings, moulded rubber products, bearing, bearings, rubber,bridge,elastomer,elastomeric,laminated,sliding, neoprene,ptfe,pads,pad, products from Dubai in UAE.
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Welcome to Pretread.com, your relayable source for ..neoprene bridge bearing, bearing pads, laminated elastomeric bearing, elastomeric bearing,.. moulded rubber products, precure tread rubber, molded rubber products, rubber gaskets, and rubber marine fenders. Our home page and connected links provide information on a wide range of rubber products.
Why use laminated rubber bearings for Bridges and buildings ?
A bridge basically consists of bridge deck supported by piers. In order to avoid over stressing and damage by movements of vehicle and loading to the piers, bridge bearings are used to accommodate these movements so as to reduce reaction forces and bending movement to within safety limits of structure. Neoprene as well as Natural Rubber is an ideal engineering material for bridge bearings as it is highly elastic and sufficiently soft to accommodate these movements without transmitting harmful stress and also it can absorb and isolate energies from impacts and vibrations. Bridge bearings are devices for transferring loads and movements from the deck to the piers.
Pretread.com is direct manufacturer of Neoprene Bridge Bearings and Laminate Elastomeric Bearings. We at pretread.com, manufacture neoprene bridge bearings, elastomeric, pads, high damping rubber bearing, expansion joints, PTFE sliding bearing, sliding bearings to AASHTO / BS / DIN specifications for the first time in the Middle East U.A.E. Laminated elastomeric bearings, bridge bearings, bridge bearing pads high damping bearing pads are manufactured mostly in neoprene elastomeric compounds.
Types of Bearings manaufactured by us.
Plain Bearing strips
Laminated Elastomeric Bearings.
High Damping Bearings.
Lead Rubber Bearings.
Pot Bearings.
PTFE-Teflon sliding Bearings.
Plain and Laminated elastomeric bridge bearings
We manufacture plain and laminated elastomeric bearings for construction industry in neoprene and natural rubber compound confirming to BS/AASHTO/DIN standards. Bridge bearings and bridge bearing pads are manufactured in ..neoprene rubber compounds,.. unless other wise specified for natural rubber compound. Our specialization is in neoprene bridge bearings, elastomeric, pads, high damping rubber bearing are from our years of experience, and with support from our technical and marketing partners.
Catalogue- Laminated Bearings.
Please download our colored catalogue on Laminated Bearings in pdf format
Catalogue Laminated Bearings
Testing - Laminated Bearing.
Laminated Elastomeric Bearing Tesing.Please click to visit
Laminated Elastomeric Bearing Testing.
High Damping Rubber Bearing (HDRB)
As an alternative to the lead rubber bearing,we offer high damping rubber bearing (HDRB) which is ideal for seismic isolation with one device - supporting the structure, providing the elastic restoring force and also the required amount of damping up to a maximum of 10-15% of critical. Moderate damping is achieved with this type of the bearing.
The HDRB isolation bearings are vertically stiff, capable of supporting vertical gravity loads, while being laterally flexible, capable of allowing large horizontal displacements. In effect, the ground is allowed to move back and forth under a base isolated during an earthquake, while leaving the building to remain "stationary." By means of its flexibility and energy absorption capability, with HDRB rubber bearings isolation system partially reflects and partially absorbs some of the earthquake input energy before this energy can be transmitted to the structure. The net effect is a reduction of energy dissipation demand on the structural system, resulting in an increase in its survisability.
Significantly reductions of structural and non-structural damage may be achieved through the use of HDRB rubber bearings seismic isolation. Reduction in elastic-force reductions by factors of 5- to 10- are possible. Expressed in simple terms with regard to building performance, this is roughly equivalent to a reduction of a Richter-magnitude-8 event to an event in the 5-to-6 magnitude range. Clearly, this is a very significant reduction. These potential benefits are greatest for stiff structures fixed rigidly to the ground, such as low- and medium-rise buildings, nuclear power plants, bridges and many types of equipment. Some of the heady duty bearings supplied by us and installed in structures in Pakistan has helped to minimize damages to the structure as will as human life.
Recent disasters caused in many parts of the world have due to earthquake has made many structural designer to start using with HDRB rubber bearings base isolation systems to building and structures. We have few Projects in hand are very keen to work on such Projects and you are requested to contact us.
Ptfe sliding bearings.
We offer both ptfe (Teflon) sliding pads as well as sliding bearings. Ptfe Sliding bearing pads can be used for lower loads and Sliding Bearings ( with laminated bearing )for higher loads. Both Sliding bearings as well as sliding bearing pads are supplied with appropriate thickness SS 316 L plates with mild steel backing plates.
Ptfe sliding bearings can be manufactured both in rectangular and disc type. Modern day construction requires large span movements for buildings and www.pretread.com has the solution for you. Especially in constructing Shopping Malls where spans are very wide and movements are over 100 mm movements, effective and economical solution is to use our ptfe sliding bearing combination with laminated neoprene elastomeric bearing.
ARP-NEOSLIDEPAD
Building structural design has taken a considerable change over the last decade. The sizes of spans have grown bigger, difference of internal and external temperature has become greater and global warming has changed climatic changes. These factors have exerted great demand on elastomeric bearing design and requirements. New polymer types and combinations with Stainless Steel have paved way for new designs. Thus we offer a combination of elastomeric bearing with ptfe known as ARP-NEOSLIDEPAD for PTFE sliding bearing requirements.
ARP-NEOSLIDEPAD - (PTFE Sliding bearing system with Stainless Steel Top and Neoprene Protective Seal) are specially designed, manufactured and assembled with a combination of polyamide or steel reinforced neoprene bearing pad with PTFE top and a SS 316 L plate sliding over top as a whole unit protected with a soft neoprene seal.
Lead Rubber Bearings LRB
A lead rubber bearing is a bigger laminated bearing manufactured from layers of rubber, sandwiches together with layers of steel, except for that in middle of bearing there will be a solid lead "plug." Top and bottom of the bearing is fitted with steel plates, which are used to attach bearing to building through its foundation.
These lead rubber bearings are designed in such a way that bearing is very stiff and strong in vertical direction, but flexible in horizontal direction. Lead, inserted as center core of bearing dissipates the energy of earthquake while the rubber, reinforced with steel plates, provides stability, supports structure and isolates vibrations.
Other rubber products manufactured by us.
In addition to bridge bearings, laminated elastomeric bearings,bearing pads, we also manufacture and supply precure tread rubber, tire retreading equipment, moulded rubber products, molded rubber, shock absorber mountings, moulded rubber products etc.
For truck tire retreading we offer camelback, precure tread rubber, moldcure rubber etc from our Middle East Plant, situated in Seif-Zone Sharjah, Dubai, U.A.E.
Our quality assurance.
We are the first and only laminated bearing manufacturing facility in the Middle East to have an in-house bearing 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 up to Vertical load of 4200 kN with horizontal shear load up to 400kN and movement up to 100 mm.
Under one roof with stringent quality control, with technical and marketing support from our Technical Partner we manufacture neoprene bridge bearings, laminate elastomeric bearings, bearing pads, pot bearings, PTFE sliding bearing, etc to AASHTO / BS / DIN specifications.
This web site has a wealth of information on our product lines and general information which we try to updated quite often. We hope you will find our site very informative and will contact us for further details and inquires.Click on below link, to obtain regular archive on our site.
We have newly added a site map to our site and click on below link, it will be easy to navigate around.SITE MAP
Thank you very much for visiting us.
Country Managers
we are seeking enterprising individuals with strong regional experiences to represent us in your country or area for our products. Please contact us with your product of interests.
Expansion Projects
For our up coming new expansion Project we are seeking partnership with any renowned Elastomeric Bearing or other rubber products manufacturer. Interested manufacturers please contact us.
June 21 - 2006
Bearing Load Testing.
We are the first and only laminated bearing manufacturing facility in Middle East to have an in-house bearing 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 movement to 100 mm.
Bearing Testing
Bearing Load Calculations
Let us verify ..load calculations.. for your bearings. On receipt of corbel size, and load details of your requirements, and we can provide calculations and bearings sizes based on results on design parameters compared to AASHTO LRFD - FREE.
Click to see sample
Dealer-ship
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 elastomeric bearings to requirement
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Installed Bridge Bearing
Installed Bridge Bearing View Photo.
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900x900x190mm Laminated Elastomeric Bearing
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