Economical and laborsaving reinforcing bar coupler

摘要: A coupling device is disclosed for rapidly and ecnomically mechanically joining a pair of elongated structural elements such as reinforcing bars in the field. The cylindrical couplingdevice includes an outer annular chamber containing porous substance which can be made to react exothermically, mixture aluminum iron oxide powder releases molten material, e.g. iron, upon being activated. mass exothermic material air quantity determined by material's porosity when packed into chamber. When react, it heats contained causes expand act propellant, from exotheric reaction propelled interior or chambers contain ends bars. flow speed amount deposited gap are regulated by: dimensions passageways between inner chambers, radial clearance inside surfaces length chambers. these parameters properly adjusted, especially size number then solidifies therein produce solid masses funtcion keying join coupler.