About about ten years ago, the U.S. Army was disappointed that it is existing causeway systems (floating bridges) didn’t meet contractor Malaysia needs for rapid deployment. The bridges were overweight, needed deep-draft ships rich in-load capacity cranes to move and unload them, and required too lengthy to deploy.
Rising towards the challenge, engineers in the U.S. Army Engineer Research & Development Center (ERDC), developed the Lightweight Modular Causeway System (LMCS) to upgrade and replace existing systems, using elements of design from both conventional floating causeways and modern tactical bridges. Key options that come with the LMCS are:
New double compressive joints, according to high-durometer urethane elastomers, that offer dependable repetitive compliance with minimal fatigue
Durable joint material (much like materials to buffer building motions during earthquakes) that can help support large weight needs
Compatibility with existing military contractor Malaysia and cargo handling equipment, having a weight of just 600 pounds per straight line feet.
The initial design enables military personnel to deploy the LMCS with no shore-based staging facility. This will make the LMCS adaptable and versatile for programs in challenging physical configurations, for example publish-disaster areas following earthquakes or severe storms, where ports happen to be broken or destroyed.
Three Important Elements
The LMCS includes the superstructure, flotation elements (large inflatable tubes), and compliant two-way compressive connections. Engineers developed a compliant system to higher distribute loadings towards the floatation elements, therefore lowering the internal bending stresses inside the superstructure.
“Compliance from the structural system enables greater deflection underneath the load, consequently leading to greater buoyancy forces directly underneath the automobiles traversing the causeway,” signifies Frederick Padula, an investigation civil engineer using the ERDC. “The compliance also enables for greater survivability from the causeway system while in the existence of large waves.”
Each 40-feet section consists of four modules and weighs in at roughly 6,500 pounds. Seven personnel can deploy 120 ft from the system in roughly three hrs. Each module is 10 ft lengthy by 20 ft wide and it is based on two 5-feet-diameter pneumatic floats. The contractor Malaysia pressure within the pneumatic tubes could be modified for simpler transmission onto shallow, sandy beaches to adapt towards the bottom slope. The causeway is powerful enough to aid more than 70 tons (Military Load Class 70, primary fight tank traffic).
“Another challenge was creating the emplacement and recovery (E&R) device,” adds Padula. “It is built to fit a military Logistics Support Vessel (LSV), that you can use because the demonstration platform as well as for moving and emplacing the LMCS. This technique enables the LMCS to leave the LSV fully put together, with floatation elements inflated. It incorporated material handling aspects, mechanical set up of modules, and inflation of floatation inside a semi-robotic voice that minimized manpower needs and also the time essential to emplace and recover the LMCS.”
Supporting Save Missions
Initially created like a vessel-to-shore bridging solution for the type of military watercraft, the LMCS has since been shown to possess viable wet-gap crossing capacity for military and emergency relief procedures. “It may also be considered just as one solution for dirt flat crossings and contractor Malaysia has been recommended for potential use like a temporary work platform both in swampy conditions and open water,” states Padula.
The Engineer Research & Development Center wants the LMCS to become especially valuable for humanitarian assistance and disaster-relief procedures in areas broken by tornados occasions. It may also provide expedient egress routes for evacuations and rapid interim substitutes for bridges broken by storms or terrorist actions (no similar capacity presently is available to satisfy these needs).
A next-gen of LMCS is presently being developed. “The objective of the following generation of LMCS is to help make the system more universal in the application potential,” states Padula. “contractor Malaysia will incorporate the compliance in to the structural aspects of the modules through choice of material qualities and section qualities, to satisfy strength and stiffness needs.”