A device for helping a wheeled vehicle pass over an obstacle. The device includes a stationary frame with a bottom and two symmetrical parallel side walls; a plate provided with two ends, a first end being movable between a high position and a low position, and an assembly for driving the first end between a low position and a high position. The drive assembly includes: a linear ram mounted under the plate with a stationary end adjacent to the second end and rigidly connected to the bottom, a mobile end, and a carriage movable in horizontal translation and resting on guides mounted on the bottom of the frame. The carriage includes two tappets and a pair of arms, the arms being symmetrical, each arm resting on one of the tappets of the carriage, and each arm supporting the first end of the plate.

A cut and cover method of constructing grade separation structures includes partially burying precast substructure elements with associated trench boxes under live traffic. Once the precast substructure elements are buried, the substructure is completed and the bridge span is installed. Other methods include installing precast superstructure elements with a formwork system and forming a bridge substructure and excavating underneath the superstructure once the superstructure is formed.

A cut and cover method of constructing grade separation structures includes partially burying precast substructure elements with associated trench boxes under live traffic. Once the precast substructure elements are buried, the substructure is completed and the bridge span is installed. Other methods include installing precast superstructure elements with a formwork system and forming a bridge substructure and excavating underneath the superstructure once the superstructure is formed.

A cut and cover method of constructing grade separation structures includes partially burying precast substructure elements with associated trench boxes under live traffic. Once the precast substructure elements are buried, the substructure is completed and the bridge span is installed. Other methods include installing precast superstructure elements with a formwork system and forming a bridge substructure and excavating underneath the superstructure once the superstructure is formed.

The invention relater to a device (1) for helping a wheeled vehicle pass over an obstacle, in particular for a person with impaired mobility. It comprises: a stationary frame (2) comprising a bottom and two side walls (9, 10), a plate (3) provided with two ends, a first end being movable between a high position and a low position in which said plate constitutes a first access ramp, an assembly for driving the vertical translational movement at least of said first end supported by said assembly, a flap (4) forming a front surface of the device in the high position of the plate and forming a second access ramp in the low position of the plate, the flap (4) being pivotably mounted on the plate at the first end of said plate, and a mechanism for deploying the flap (4), comprising at least one connecting rod including a front end hingedly connected to the flap (4), the hinge being separated from the upper edge and from the lower edge of said flap (4), a rear end linked to a first slide slidably mounted in a linear guide provided in the plate, and a central portion linked to a second slide (45) slidably mounted in a guide (19) provided in one side of the frame, the connecting rod moving in a substantially vertical plane.

A loading ramp includes first and second ramp portions that are coupled by a hinge assembly such that the first and second ramp portions are movable relative to one another between an extended position and a folded position. The loading ramp also has one or more lights coupled to one of the ramp portions and a switch assembly coupled to the ramp portions such that in the extend position the switch assembly is activated to illuminate the one or more lights.

Structures, systems, and methods for vehicle-to-road technology for one or more of alignment, stopping, slowing, and slipping by electromagnetic forces are disclosed, including a road system, comprising a road having a longitudinal axis and containing ferrous material positioned in a pattern aligned with the longitudinal axis, the pattern configured to, when the ferrous material is magnetized, generate a magnetic force such that a vehicle on the road is guided by the magnetic force. In some implementations, the pattern may be configured to, when the ferrous material is magnetized, generate the magnetic force such that the vehicle on the road is guided by the magnetic force in a predetermined direction. The ferrous material may be configured to change between a magnetized state and an unmagnetized state based on application of an electrical current to the ferrous material.

Provided is a loading ramp having two or more ramp portions having progressively decreasing widths and each defining a recessed spaced. The loading ramp has an extended position where the two or more ramp portions are parallel to one another or angled relative to one another, and a folded position where one or more ramp portions are nested within another of the ramp portions such that the one or more ramp portions are disposed in the recessed spaced of the another ramp portion.

A loading device for users to move vehicles onto an elevated platform, using an inclined structure formed of a plurality of horizontal sections that are each adjustable so as to adjust the width of the inclined structure.

A method for improving the seismic performance of bridges by utilizing the beam body and an energy dissipation and seismic mitigation bridge bearing, which can effectively eliminate the harmful vibration of the bridge pier in the inherent frequency band, thus reducing the stress of the pier body and improving the seismic performance of the bridge pier without introducing external additional mass and looking for an installation space on the pier. The method includes the following steps: obtain the natural frequency fi, the equivalent modal mass Mi and the modal stiffness Ki of the pier in the longitudinal or transverse direction by numerical modal analysis or experimental modal test; determine the mass mi of the beam body; calculate the connection stiffness ki and the connection damping ci between the beam body and the pier; select the bearing system with above connection stiffness ki and the connection damping ci.