JPH02229301A - Spacing timber made of compound concrete - Google Patents

Abstract

PURPOSE:To improve strength and wear resistance property of a spacing timber by placing ordinary concrete to the intermediate layer and high strength concrete to the upper and lower layers, and constituting them so as to form a harmonious whole at respective boundary faces. CONSTITUTION:A spacing timber 20 is constituted so that the intermediate layer is made of ordinary concrete 21 and the upper and lower layers are made of high strength concrete 22 such as resin concrete or polymer cement concrete. Further consolidation is performed so as to form a harmonious whole at respective boundary faces, by using a vibrator or the like in the formwork, and at the end high temperature curing or the like is performed. Hereby, the long life of it can be maintained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to concrete sleepers constituting railway and crane tracks. Conventional technology and its issuesIn recent years, sleepers made of concrete have been increasingly used to accommodate the increase in train weight and speed. Sleepers are generally used depending on the weight of the train passing on the rails (approximately 8 tons per car). Repeated illumination transformation,
A tensile force acts on the top surface of the sleeper, and a compressive force acts on the bottom surface. Furthermore, the sleepers used at level crossings are subject to compressive force on the upper surface and tensile force on the lower surface due to the weight of passing cars, etc. However, in general, concrete has a property of being strong in compressive force but weak in tensile force, and measures for tensile strength are desired. Further, as shown in Fig. 113, when the sleepers are used for a long period of time, they wear out due to friction with the lower surface 10a and the bed crushed stones G near both ends, creating a gap S between the lower surface 10a and the bed crushed stones G. There are many things. For this reason, each time a train passes, both ends of the sleeper 10 sink by this gap S, the top surface warps, tensile force acts on the top surface, cracks appear on the top surface, and rainwater intrudes. The present invention provides a composite concrete structure in which high-strength concrete layers are arranged above and below a normal concrete layer. The above-mentioned problem was solved by using manufactured sleepers.The lower surface of the sleeper that comes into contact with the crushed stones of the working roadbed and the upper surface on which the rails are installed are covered with a high-strength concrete layer, and the central part of the sleeper in the thickness direction Since the sleeper is made of a normal concrete layer, the wear resistance and tensile strength of the sleeper are improved overall.Examples Examples of the present invention will be explained below based on the drawings.Sleepers 20 are , The central part in the thickness direction is an ordinary concrete layer 21, and high-strength concrete layers 22 and 22 are arranged above and below this ordinary concrete layer 21.The Australian rail R is installed on the upper surface 20b, Underneath 2
0a is in contact with road bed crushed stone G. High-strength concrete 22 includes resin concrete that uses liquid plastic as a binder instead of cement,
Polymer cement concrete made by adding several tens of percent plastic solution to cement, fiber-reinforced concrete made by mixing cement with glass fiber steel fiber cut into appropriate lengths, carbon fiber, etc. Non-woven fabric made from plastic or natural fibers. There are non-woven reinforced concretes made by laminating one or more sheets in a sandwich-like manner inside cement. The manufacturing procedure for this sleeper 20 is as follows. First of all,
Place the formwork shaped like an upside-down sleeper on a horizontal table. Next, pour the appropriate amount of fluid high-strength concrete. If the high-strength concrete uses non-woven fabric, add the non-woven fabric and concrete alternately. After pouring, smooth the entire top surface. Next, pour regular concrete and level the top surface. Furthermore, high-strength concrete is poured on top of this and the top surface is leveled. Afterwards, when consolidation is performed using a pibrator, etc., the areas near each interface between ordinary concrete and high-strength concrete, which have different properties, become one. Finally, the sleepers are completed by high-temperature curing and other necessary processes. During this process, if necessary, it is possible to incorporate reinforcing reinforcing bars or tensioning steel rods (or wires) to make the concrete even stronger. It is of course possible to make so-called pre-stressed concrete by adding additional processes. The composite mancrete sleeper 20 manufactured in this way has high-strength concrete layers 22, 22 at the top and bottom.
Since it has a three-layer structure with a normal concrete layer 21 placed in the middle, it strengthens the normal concrete, which is inherently weak against tension, and improves wear resistance, thereby preventing the occurrence of cracks. This will extend the service life. Moreover, since ordinary concrete is used for the center, it is possible to suppress increases in manufacturing costs. Effects of the Invention As explained above, the composite concrete sleeper of the present invention combines an ordinary concrete layer and a high-strength concrete layer, so it can be made relatively inexpensive and has improved wear resistance and tensile strength of the sleeper. This has the effect of improving strength and extending service life. ``Therefore, it is also possible to reduce the weight and volume of sleepers that were previously required in order to provide the required strength and wear resistance.

[Brief explanation of the drawing]

Figure 1 is a front view of the composite concrete sleeper of the present invention, and Figure 2 is a right side view of Figure 1. Figure 3 is a front view of a conventional concrete sleeper. 20...Composite concrete sleepers 21...Normal concrete layer 22...High strength concrete layer Diagram 2 G Diagram 3 Procedure amendment

Claims (1)

[Claims] Composite concrete sleepers with high-strength concrete layers placed above and below ordinary concrete layers.