A method for forming a hollow box-shaped cross section beam utilizes double walled trough that allows for prefabrication with pre-stressed concrete. The hollow box-shaped cross section precast beam is formed by filling the fabrication conduit with precast concrete. A number of tendons may be positioned within the fabrication conduit in quantities and positioned that are favorable to resist deflecting forces and provide anchoring forces within the hollow trough or box-shaped cross section precast beam formed therein. Further, a box shaped cross section bridge girder can be formed having no tensile stresses due to its own weight. The instant abstract is neither intended to define the invention disclosed in this specification nor intended to limit the scope of the invention in any way.

A method for forming a hollow box-shaped cross section beam utilizes double walled trough that allows for prefabrication with pre-stressed concrete. The hollow box-shaped cross section precast beam is formed by filling the fabrication conduit with precast concrete. A number of tendons may be positioned within the fabrication conduit in quantities and positioned that are favorable to resist deflecting forces and provide anchoring forces within the hollow trough or box-shaped cross section precast beam formed therein. Further, a box shaped cross section bridge girder can be formed having no tensile stresses due to its own weight. The instant abstract is neither intended to define the invention disclosed in this specification nor intended to limit the scope of the invention in any way.

The present invention is a support structure including elongate hollow cylinder and flat plates secured thereto. A first rigid flat plate is horizontally disposed in overlying relation to each hollow cylinder and a second rigid flat plate is horizontally disposed in underlying relation to each hollow cylinder. Stress-distributing strengthening members are circumferentially positioned about the hollow cylinder and secured to their associated rigid flat plates. A key may extend from a first end of each hollow cylinder and a mating socket may be formed in a second end of each hollow cylinder to facilitate end-to-end interconnection of a plurality of hollow cylinders.

Disclosed is a concrete box beam using a refrigeration stirrup, which may include a box beam, an evaporation pipe, a water inlet pipe, and a water removal assembly; the box beam is provided with a plurality of steel bars in a circumferential direction; the n evaporation pipe surrounds and is connected to an outer side of the plurality of steel bars and an input end of the evaporation pipe is higher than an output end of the evaporation pipe; an output end of the water inlet pipe is connected to the input end of the evaporation pipe, and the water inlet pipe is connected to a three-way valve; and the water removal assembly includes a water sealing cavity, the output end of the evaporation pipe is connected to the water sealing cavity by means of a recovery pipe, the water sealing cavity is connected to a first pipeline.

Disclosed is a concrete box beam using a refrigeration stirrup, which may include a box beam, an evaporation pipe, a water inlet pipe, and a water removal assembly; the box beam is provided with a plurality of steel bars in a circumferential direction; the n evaporation pipe surrounds and is connected to an outer side of the plurality of steel bars and an input end of the evaporation pipe is higher than an output end of the evaporation pipe; an output end of the water inlet pipe is connected to the input end of the evaporation pipe, and the water inlet pipe is connected to a three-way valve; and the water removal assembly includes a water sealing cavity, the output end of the evaporation pipe is connected to the water sealing cavity by means of a recovery pipe, the water sealing cavity is connected to a first pipeline.

A viaduct specially configured to secure and protect an international border.

A viaduct specially configured to secure and protect an international border.

A shallow single plate cold roll formed steel tub girder member is fabricated from unheated steel plate material by a cold roll-forming process which eliminates longitudinal welds and induces camber in the tub girder member.

A shallow single plate cold roll formed steel tub girder member is fabricated from unheated steel plate material by a cold roll-forming process which eliminates longitudinal welds and induces camber in the tub girder member.

A longitudinal modular system with boards (3) for underpass bridges for installation of two tracks for railway circulation in which the board (3) is placed between two consecutive piers (4) and comprises a pair of longitudinal beams (1), which themselves comprise a lower wing (2c), for supporting on the piers (4), a core (1b) and an upper wing (1a); and a plurality of transversal slabs (2) that are attached to the lower wings (2c) of the longitudinal beams (1), thus forming a

U-shaped configuration, where the length of the longitudinal beams (1) is essentially similar to the span between two piers (4), and the configuration of the board (3) has a transversal, U-shaped section such that the railway circulates inside said U shape. The invention also describes the method for constructing same.