摘要:
The sleeper block unit (1) for railway track systems consists of a sleeper block (2) and of a sleeper shoe (3) that partly surrounds the sleeper block (2). The sleeper block (2) has a head portion (4) and a base portion (6), the head portion (4) extending beyond the base portion (6) in length and in width, thus forming a step (10). At the upper edge of the sleeper shoe (3), a surrounding, upwardly and outwardly extending sealing lip (14) that lies against the step (10) is arranged. As a result, during vertical movements of the sleeper block (2) in the sleeper shoe (3), the sealing lip (14) is deformed substantially vertically in the elastic range rather than rubbing against an outer wall of the sleeper block as in known sleeper block units. In this manner the sealing lip is subject to reduced wear so that the sealing effect is maintained for a longer period and the sleeper block unit (1) has a longer lifetime.
摘要:
A monoblock concrete crosstie for railway tracks that achieves a high performance in operation includes a steel structure that is formed from ultra-resistant high strength steel plates embedded in a concrete element and having pre-stressed cold rolled wires with ends that form button head knots which are anchored to the steel plates. A faceted geometry allows optimal material usage and in turn increases the crosstie-ballast interlocking and stability with respect to the support surface.
摘要:
Disclosed is a heavyweight concrete composition using slag byproducts, including: ground granulated blast furnace slag; slow-cooled electric-arc-furnace oxidizing slag or atomized steel slag used as a fine aggregate; a coarse aggregate; water; and a chemical admixture based on 100 parts by weight high-early-strength cement. Thus, the heavyweight concrete composition contains a large quantity of steel slag and blast-furnace slag that are byproducts in iron-making and steel-making processes, thereby remarkably reducing an amount of emission of carbon dioxide and maximizing the recycling of waste resources for preserving the natural environment. As a result, an eco-friendly heavyweight concrete product can be made.
摘要:
A railbed comprises a supporting element in the form of a sleeper, plate or the like of a cast compound such as concrete and an insert preferably of electrically insulating material which is grouted or embedded therein.
摘要:
A rail-mounting arrangement includes a crosstie provided with a rail-receiving platform including a longitudinal recess therein to accommodate a clip-type rail anchor thereby precluding rail creep in either direction. Rail gage clips are removably attached to the crosstie on both sides of the rail base to maintain the prescribed gage and include means to prevent displacement thereof during the inherent rail wave motion.
摘要:
An electronic tag (Radio-frequency identification) device for a rail traffic concrete prefabricated parts is disclosed, which comprises a bracket. A column is on a top of the bracket. There is a groove on a top end of the column. The electronic tag is inside groove. The electronic tag device further comprises a waterproof end cap which is put on the top of the column. The pressure relief holes, the release-proof clasps, the rebar clamps, the groove on the column, etc. ensure a stable fixation of the electronic tag inside the concrete railroad sleeper. The waterproof end cap is able to protect and fix the electronic tag.
摘要:
Method of design and manufacturing concrete structures subjected to relevant cyclic loads along their service lives, as wind towers, and a fatigue testing machine. The method consists on the design of concrete structures conditioned by cyclic loads considering a fatigue strength value specified by the project as one of the main design parameters, which will be verified during the manufacturing phase as one of the control parameters of the quality assurance plan by performing fatigue strength test on concrete samples representative of the concrete structural elements produced on said manufacturing phase. The method allows to decouple the concrete fatigue strength from the compressive strength of the material, which is why includes a verification of the fatigue strength as a part of a quality assurance plan of production according to a new developed procedure.
摘要:
Described herein are methods of improving the durability of concrete by the infusion of the concrete with a low-viscosity oligomeric solution, and subsequent curing of the oligomeric solution to form a high toughness polymer. Also described herein are compositions containing concrete and high toughness polymers, and formed articles made from concrete and high toughness polymers. The methods and compositions are useful for improving the durability of concrete roads and structures, as well as the durability of repairs to concrete roads.
摘要:
The invention relates to a sleeper (1) for a gravel-mounted structure in railways, which has a cross member (4) extending along a sleeper longitudinal axis (6) and two longitudinal members (5) spaced apart from one another by the cross member (4), and each longitudinal member (5) has a bearing (9) extending on a top face for mounting a rail element (10) above the longitudinal member (5). Each longitudinal member (5) has one or more mounting devices (26) for a rail fixing element (28) each for retaining a rail element (10) on the longitudinal member (5) and at least one of the mounting devices (6) is disposed transversely offset from the sleeper longitudinal axis (6) on at least one of the two longitudinal members (5). The invention further relates to a sleeper (1) of this type which is of a stepped or recessed design at the ends of the longitudinal members (5) , to enable connecting elements (56) to be fitted in these regions in order to secure two rail elements (10) lying end to end.