FIBER-REINFORCED PRESTRESSED REINFORCED CONCRETE SLEEPER

Abstract

A fiber-reinforced prestressed reinforced concrete sleeper is integrally cast and includes a sleeper body and two rail bearing regions. A rail clamping base is arranged on a surface of the each rail bearing region. The two rail bearing regions are located under rails on both sides of the sleeper and the two rail bearing regions are located above the sleeper body. A reinforcing fiber is mixed into the two rail bearing regions only, and a reinforcing rib is arranged in the sleeper body. The reinforcing fiber is concentrated in a main stress region under the surface of the rail bearing regions. The reinforcing fiber arranged in a region with a large stress is more than the reinforcing fiber arranged in a region with a small stress.

Claims

1. A fiber-reinforced prestressed reinforced concrete sleeper, comprising a sleeper body and two rail bearing regions, wherein the fiber-reinforced prestressed reinforced concrete sleeper is integrally cast; a rail clamping base is arranged on a surface of the each rail bearing region of the two rail bearing regions; the two rail bearing regions are located under rails on both sides of the fiber-reinforced prestressed reinforced concrete sleeper, respectively, and the two rail bearing regions are located above the sleeper body; a reinforcing fiber is mixed into the two rail bearing regions only, and a reinforcing rib is arranged in the sleeper body; the reinforcing fiber is concentrated in a main stress region under the surface of the each rail bearing region.

2. The fiber-reinforced prestressed reinforced concrete sleeper according to claim 1, wherein, the reinforcing fiber is unevenly arranged according to a stress on the fiber-reinforced prestressed reinforced concrete sleeper, and the reinforcing fiber arranged in a region with a large stress is more than the reinforcing fiber arranged in a region with a small stress.

3. The fiber-reinforced prestressed reinforced concrete sleeper according to claim 1, wherein, an under-rail cross section of the fiber-reinforced prestressed reinforced concrete sleeper is 230-250 mm in height, a middle cross section of the fiber-reinforced prestressed reinforced concrete sleeper is 190-210 mm in height, and a bottom surface of the fiber-reinforced prestressed reinforced concrete sleeper is 270-320 mm in width.

4. The fiber-reinforced prestressed reinforced concrete sleeper according to claim 1, wherein, the reinforcing fiber is a basalt fiber or a steel fiber.

5. The fiber-reinforced prestressed reinforced concrete sleeper according to claim 1, wherein, the reinforcing rib is an ordinary steel bar or a prestressed steel wire.

6. The fiber-reinforced prestressed reinforced concrete sleeper according to claim 1, wherein, each of the rails is directly placed on the surface of the each rail bearing region, and the rails are clamped by the rail clamping base.

7. A method for manufacturing the fiber-reinforced prestressed reinforced concrete sleeper according to claim, comprising: employing two pouring pipelines, wherein a first pouring pipeline of the two pouring pipelines is configured to pour a pure concrete, and a second pouring pipeline of the two pouring pipelines is configured to pour a mixture with a maximum reinforcing fiber ratio; connecting the two pouring pipelines to a discharge port, respectively, wherein a stirrer is arranged at the discharge port; simultaneously pouring by the two pouring pipelines to form the sleeper body; and simultaneously pouring by the two pouring pipelines to form the two rail bearing regions according to preset reinforcing fiber ratios of different regions, wherein discharging speeds of the two pouring pipelines are controlled to realize the preset reinforcing fiber ratios.

8. The method according to claim 7, wherein, the preset reinforcing fiber ratios of the different regions are obtained as follows: determining a stress distribution through a finite element analysis (FEA) software; determining the preset reinforcing fiber ratios according to the stress distribution, wherein the reinforcing fiber arranged in a region with a large stress is more than the reinforcing fiber arranged in a region with a small stress.

9. The method according to claim 7, wherein, the reinforcing fiber is unevenly arranged according to a stress on the fiber-reinforced prestressed reinforced concrete sleeper, and the reinforcing fiber arranged in a region with a large stress is more than the reinforcing fiber arranged in a region with a small stress.

10. The method according to claim 7, wherein, an under-rail cross section of the fiber-reinforced prestressed reinforced concrete sleeper is 230-250 mm in height, a middle cross section of the fiber-reinforced prestressed reinforced concrete sleeper is 190-210 mm in height, and a bottom surface of the fiber-reinforced prestressed reinforced concrete sleeper is 270-320 mm in width.

11. The method according to claim 7, wherein, the reinforcing fiber is a basalt fiber or a steel fiber.

12. The method according to claim 7, wherein, the reinforcing rib is an ordinary steel bar or a prestressed steel wire.

13. The method according to claim 7, wherein, each of the rails is directly placed on the surface of the each rail bearing region, and the rails are clamped by the rail clamping base.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0018] FIG. 1 is a vertical view of a sleeper of the present invention.

[0019] FIG. 2 is a side view of the sleeper of the present invention.

[0020] FIG. 3 is a plan view of the sleeper of the present invention.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The present invention is described in detail hereinafter with reference to the drawings and embodiments. However, it should not be construed that the scope of the present invention is limited to the following embodiments. Instead, technologies implemented based on the content of the present invention shall fall within the scope of the present invention.

[0022] As shown in FIGS. 1-3, a fiber-reinforced prestressed reinforced concrete sleeper is integrally cast and includes the sleeper body 3 and the rail bearing regions 2. A rail clamping base is arranged on the surface of the rail bearing regions 2; There are two rail bearing regions 2, and the two rail bearing regions 2 are located under rails on both sides of the sleeper, respectively, and are located above the sleeper body. The reinforcing fiber is mixed into the rail bearing regions 2 only, and the reinforcing rib 1 is arranged in the sleeper body. The reinforcing fiber is concentrated in a main stress region under the surface of the rail bearing regions.

[0023] Further, the reinforcing fiber is unevenly arranged according to a stress on the sleeper, that is, the reinforcing fiber arranged in a region with a large stress is more than the reinforcing fiber arranged in a region with a small stress.

[0024] Further, an under-rail cross section of the concrete sleeper is 230-250 mm in height, a middle cross section of the concrete sleeper is 190-210 mm in height, and a bottom surface of the concrete sleeper is 270-320 mm in width.

[0025] Further, the reinforcing fiber is a basalt fiber or a steel fiber. Further, the reinforcing rib 1 is an ordinary steel bar or a prestressed steel wire. Further, the rails are directly placed on the surface of the rail bearing regions, and are clamped by the rail clamping base.

[0026] A method for manufacturing the fiber-reinforced prestressed reinforced concrete sleeper mentioned above includes the following steps. Two pouring pipelines are employed, wherein one pouring pipeline is configured to pour a pure concrete, and the other pouring pipeline is configured to pour a mixture with a maximum reinforcing fiber ratio. The two pouring pipelines are connected to a discharge port, respectively, and a stirrer is arranged at the discharge port. First, the two pouring pipelines simultaneously pour to form the sleeper body. Then, the two pouring pipelines simultaneously pour to form the rail bearing regions according to preset reinforcing fiber ratios of different regions, wherein discharging speeds of different pouring pipelines are controlled to realize the preset ratios. The rail bearing regions are divided into N segments for multi-segment pouring according to stress distribution, wherein N≥3. Mixtures with different fiber ratios are poured in different segments. Because the stress distribution of sleepers on the same road segment is similar, large-scale continuous production can be achieved by means of multi-segment pouring.

[0027] Further, the preset reinforcing fiber ratios of the different regions are obtained as follows. A stress force distribution of the overall stress force born by a sleeper during operation on a heavy haul railway is determined through a finite element analysis (FEA) software. The reinforcing fiber ratios are determined according to the stress distribution, wherein the reinforcing fiber arranged in a region with a large stress is more than the reinforcing fiber arranged in a region with a small stress. The present invention uses the FEA software to determine stress distribution and divide the rail bearing regions into N segments based on the stress distribution for multi-segment pouring. Mixtures with different fiber ratios are poured in different segments.

[0028] For the purposes of promoting an understanding of the principles of the invention, specific embodiments have been described. It should nevertheless be understood that the description is intended to be illustrative and not restrictive in character, and that no limitation of the scope of the invention is intended. Any alterations and further modifications in the described components, elements, processes or devices, and any further applications of the principles of the invention as described herein, are contemplated as would normally occur to one skilled in the art to which the invention pertains.