The expansion joint of the bridge is the structure of satisfying the roof beam body capable of expansion and contraction, it requires the expansion joint to have good durability, comfortableness going, good waterproof, convenience of constructing, simple and convenient maintenance. In addition, it can't be ignored either that the choice of the rational structure, the precision of processing and package.

The actuating system of OVM serial expansion joints are composed of the crossbeam, elastic support and control spring being made of special material. Comparing with other like products, its main characteristic is:
a. control displacement spring has good compression and spring-back performance, it can balance expansion strength of side beam component and transmit minimum displacement resistance to roof beam, at the same time, it can reduce the momentum pressure and reduce the noise.
b. the roof beam and side beam of expansion joints in the domestic present adopt several kinds of hot-rolling, press forming and group weld. Because it adopts welding steel plates or steel sections to the bonded structure of special steel section, bulk property is relatively bad, work load of electric welding is heavy, it is easy to appear sealing-off. While sealing rubber-treated tape using battens and screws, the fastener is easy to be staining and break, lead to rubber-treated tape coming off or jumping and taking off. Yet OVM company adopts whole hot rolling, or extrusioning forming structure, and control its pass strictly, so have solved above-mentioned problems.
c. because of transmission pattern (for instance adopting oblique supporting), expansion homogeneity of the product is poor, and it is apt to self-lock. It is parallel to assign for OVM company to adopt, increase mechanical linkage at the same time, then overcome question of self-lock, and can make every joint can remain even while dilatation, reduce the impact of the walking automobile, improve the service life of the expansion joint greatly.
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plateform support	The finished product of expansion joint	Certificate of quality of the traffic engineering products

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OVM company manufacture plateform elastomeric support, tetrafluoroethylene slide plate elastomeric support, slope type elastomeric support, ball precededs round plateform elastomeric support and GPZ、QPZ、QZ、TPZ, etc. all kinds of highway bridge pot elastomeric bearings, it has the following characteristic mainly:
a. the products are complete in specifications. For the commonly used plateform elastomeric support modes GJZ, GJZF4, their load carrying strength are from 80kN to 30000kG, their specifications are from GJZ80×100×21 to GJZ1500×2000×132; for modes GYZ, GYZF4, their load carrying strength are from 200kN to 20000kG, their specifications are from GYZ100×21 to GYZ1500×253; for the highway bridge pot elastomeric bearings mode GPZ, the load carrying strength is from 800kN to 60000kG.
b. OVM company can produce according to standard ASTM, AASHO of U.S.A., JIS of Japan and products standard of European, export to such countries as Vietnam, Pakistan and Japan,etc., in the Vietnamese engineering of bridge occupies the sizable market.
c. can produce super-huge bearing, for instance large-scale plateform support of specification 2000×1550×200mm, 1500×1500×132mm, they have passed product properties measurement of Tongji University under personally supervising by the customer and firmly got the customer's trust.
d. considering influence of earthquake, OVM company has developed lead core damping elastomeric support by cooperating with Japan and highway communication university of Xi'an, filled the domestic gaps, and have succeeded in being applyed to the project of Shanxi, Japan,etc..