A railroad sleeper (1) for fixation of at least a pair of rails (2,2′) of a railroad network is provided, including a contact surface (3), wherein each rail of the pair of rails (2,2′) is fixed spaced apart from each other, the railroad sleeper (1) being configured by including a hollow sector (4) delimited by association of the contact surface (3) with the anchorage walls (5,5′), thus establishing a free portion (17) adjacent to the anchorage walls (5,5′) and opposite the contact surface (3). An embodiment in which the hollow sector (4) of the railroad sleeper is delimited by a support surface and the process of manufacturing a railroad sleeper is also provided.

The present invention discloses an assembled bamboo sleeper, which is obtained by using a bamboo unit as a raw material, dried and modified at the temperature of 110-180° C., undergone coating treatment using a dopamine solution, adhesive dipping, curing and solidifying, assembling and gluing, further solidifying, further treatment using a dopamine solution, and anti-mildew and/or anti-corrosion and/or anti-insect treatment, and then fastened. The present invention further provides a preparation method for the foregoing bamboo sleeper. The bamboo sleeper prepared in the present invention is green and environmentally friendly, and applicable for ballasted tracks of railways and urban rail transit systems.

The present invention discloses a one-step integrally-formed bamboo sleeper. For the one-step integrally-formed bamboo sleeper, a bamboo unit is used as a raw material, to be dried and modified at the temperature of 110-180° C., and then subject to adhesive dipping, adhesive throwing, solidification, dopamine solution treatment, anti-mildew and/or anti-corrosion and/or anti-insect treatment, and fastening, to obtain the one-step integrally-formed bamboo sleeper with a density of 0.9-1.5 g/cm.sup.3. The present invention further provides a preparation method for the foregoing bamboo sleeper. The bamboo sleeper prepared in the present invention has a suitable elastic modulus, and applicable for ballasted tracks of railways and urban rail transit systems.

An enhanced wood product includes a wooden board or plank having a length and at least three sides, the sides defining a polygonal cross section along the length of the wooden board or plank. A polyurethane-urea coating on at least two of the sides very substantially increases the strength of the wood product and various products made with coated wood.

The present invention relates to a railroad sleeper (1) for fixation of at least a pair of rails (2,2′) of a railroad network, comprising a contact surface (3), wherein each rail of the pair of rails (2,2′) is fixed spaced apart from each other, the railroad sleeper (1) being configured by comprising a hollow sector (4) delimited by association of the contact surface (3) with the anchorage walls (5,5′), thus establishing a free portion (17) adjacent to the anchorage walls (5,5′) and opposite the contact surface (3). The present invention further discloses an embodiment in which the hollow sector (4) of the railroad sleeper is delimited by a support surface and the process of manufacturing a railroad sleeper.

The present invention relates to a railroad sleeper (1) for fixation of at least a pair of rails (2,2′) of a railroad network, comprising a contact surface (3), wherein each rail of the pair of rails (2,2′) is fixed spaced apart from each other, the railroad sleeper (1) being configured by comprising a hollow sector (4) delimited by association of the contact surface (3) with the anchorage walls (5,5′), thus establishing a free portion (17) adjacent to the anchorage walls (5,5′) and opposite the contact surface (3). The present invention further discloses an embodiment in which the hollow sector (4) of the railroad sleeper is delimited by a support surface and the process of manufacturing a railroad sleeper.

The invention relates to a sleeper for the track superstructure, which is manufactured in one piece from a plastic material, with the sleeper having an elongated base shape with two end sections, which are connected by a middle section of the sleeper and held at a distance and on their upper side in each case one contact surface is provided for in each case one rail to be supported on the respective end section with a reinforcement extending in the longitudinal direction of the sleeper being embedded into the middle section. In order to design such a plastic sleeper such that it has optimised strength and can be reliably manufactured even using cost-effective plastic/sand mixtures having a high proportion of sand, the invention proposes that the reinforcement extends over the length of the middle section, that the reinforcement is in each case anchored in the respective end section an edge region of the end sections assigned to the middle section and in that the reinforcement is wholly or partially arranged in the upper quarter of the height of the sleeper.

A molded composite cross tie and two molded, non-metallic composite tie plates are molded into a single molded railroad composite cross tie unit. The molded railroad composite cross tie unit is fully assembled and ready for laying a ballast and accepting railroad track. The molded, non-metallic composite tie plates are molded with a cant onto which railroad track may be laid. The railroad track is secured by either traditional spikes or screws. When secured by screws, holes are molded with thread that is compatible with the screws used to hold the railroad track in place. One molded, non-metallic composite tie plate is molded into each end of the molded composite cross tie. The separation between the two molded, non-metallic composite tie plates is determined by the gauge of the railroad track.

A molded composite cross tie and two molded, non-metallic composite tie plates are molded into a single molded railroad composite cross tie unit. The molded railroad composite cross tie unit is fully assembled and ready for laying a ballast and accepting railroad track. The molded, non-metallic composite tie plates are molded with a cant onto which railroad track may be laid. The railroad track is secured by either traditional spikes or screws. When secured by screws, holes are molded with thread that is compatible with the screws used to hold the railroad track in place. One molded, non-metallic composite tie plate is molded into each end of the molded composite cross tie. The separation between the two molded, non-metallic composite tie plates is determined by the gauge of the railroad track.

An under sleeper pad (1) to be fastened to an underside (3) of a sleeper (4), on the opposite side from the tracks (2). The under sleeper pad (1) has at least one elastic layer (5) having cork grains (6) of a cork granulate distributed throughout. In addition, the elastic layer (5) has at least one cellular synthetic elastomer (7).