Camelot Flex systems, designed to equip the expansion joints of road bridges with extensive slide, solve the technical problem of unimpeded traffic over the joints, in terms of improved variants compared to other products on the market.
The system is composed of some rectangular struts with a special profile, which ensures an end abutted by combining sliding telescopic other longerons also arranged symmetrically and at the other end is abutting through spherical joints by one frame anchored to the structure bridge in the area that borders the point.
Camelot Flex system has the following advantages:
- Simple and robust construction
- Safety in use
- Great flexibility, spatial
- High capacity permissible movement of contraction / expansion to the axis of the bridge, or another direction much different
- High capacity permissible movement in directions along any other axes
- High capacity takeover rotations around any axis
- The possibility of installing joints that present a significant deviation from the right angle, to its own axis to the longitudinal axis of the bridge
- Easy and firm anchoring in a prior installation niche
- Minimum sound impact at the contact between tires and point system
- Taking over the tasks vertical and horizontal forces traffic, sending them directly structure through a reduced number of components
- Simple waterproofing, quick flow guaranteed
- Insensitivity to aggressive environmental factors, extreme climatic conditions, dirt, ice.
Camelot Flex systems are configured individually, in small series, depending on the conditions of each site separately and the technical requirements of the recipient.
The main components of the system can be seen in figures.
The system is a constituent of some rectangular struts with a special profile, arranged symmetrically supported at each end in a mutually by sliding telescopic joint, and at the other end abutting through spherical joints frameworks, anchored to the bridge structure by ancore- loop, waterproofing is ensured by a drainage channel.
The whole surfaces of the upper horizontal struts forming the connection between adjacent sections of road being coplanar with it and assuring auto traffic over the point of expansion. Ball joint assembly of struts that connect with edges that form the point through frameworks, flexibility attribute gives the entire system.
This quality allows the system:
- Installation on joints that shows some angles to the axis of the bridge plan
- Adapting to different movements, translational along the three axes
- Adapting to movements of rotation around the three axes.
All these features allow the system to take traffic efforts in good conditions, in normal or exceptional situations.
Shortcomings and disadvantages of other products on the market:
To cover the expansion joints of bridges with large displacements are known modular expansion, consisting of a set of laminated beams that equally distributes its expansion movement, dividing it into individual gaps created between them.
This constructive solution shows in practice a number of shortcomings:
a) The more range of motion of contraction / expansion is greater, the more complicated and
heavier are modular systems. With a large number of components articulated the possibility of damage or wear is high.
b) existing modular systems have a reduced ability to tolerate large movements in other directions than the main axis of the bridge, or rotations around the three axes geometric. In practice, during the existence of a bridge manifests a multitude of unforeseen events: earthquakes, effects of extreme climate events, traffic events; However having the effect of major structural stresses and displacements of adjacent sections of the bridge, to each other, the more extensively compared to normal operating conditions - with harmful effects on road traffic safety.
c) Another drawback of modular systems classic is limited ability for them to adapt to functional requirements of an expansion joint with plans axis showing at angles - other than the right angle - to the longitudinal axis of the bridge more especially at values much different.
d) modular systems have the disadvantage of complicated construction, massive and heavy, which requires installation niches providing large, difficult transport and lengthy assembly operations.
e) reduction of noise emissions occurring at the contact between tires and laminated beams, whilst crossing the joint area can not be achieved only with relatively complicated and expensive solutions. The large number of fasteners and small parts used, present on the road surface and exposed to intense vibrations from traffic, increase the risk of accidents due to uncontrolled unscrewing and detaching.
f) Sudden braking a heavy vehicle crossing the expansion joint induces successive horizontal forces on laminated beams in a row, making a swinging motion harmonic horizontal which increases the occurrence of requests intense - like a chain reaction - the connections between the different assembly components, amplifying demands on joints anchoring system that connects the bridge structure.
g) Waterproofing assembly of a modular system - made by elastomeric profiles embedded in laminated beams - is a mounting solution difficult, laborious sealing with additional consumption of materials, water and drainage and defluirea results require laborious troubleshooting.
h) The integrity of elastomeric profiles - and waterproofing done by them - are susceptible to damage caused by the accumulation of sand, chippings, ice fragments detached from the asphalt mixture, small parts or loose metal scrap hydrocarbons spilled into the roadway.
The technical problem to be solved by Camelot Flex system is to eliminate the drawbacks described above by different design solution that better meet functional requirements, static and movement, the expansion joints between adjacent sections composing road bridges.
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