A high-strength short subway sleeper and a preparation method thereof

Abstract

The invention discloses a high-strength short subway sleeper and a preparation method thereof, and relates to the technical field of subway sleepers. The technical key points include a steel plate base, three large steel bar frames are horizontally welded to the top of the steel plate base, four groups of small steel bar frames are welded together on the inner sides of the three large steel bar frames, a concrete platform sleeper is cast at the top of the steel plate base and at positions corresponding to the large steel bar frames and the small steel bar frames, fixing holes are provided at the diagonal positions of the top of the concrete platform sleeper, the fixing holes are passed through to the bottom of the steel plate base, a sleeve is cast and fixed on the inner side of the fixing hole, an external thread groove is provided below the outer wall of the sleeve, and a steel sleeve is threadedly sleeved on the lower end of the sleeve. The technical effect is that a short sleeper is obtained through the improved design, which overcomes the problem that the sleeve pull-out force cannot reach the stress pull-out requirement of 100kN due to the insufficient size and height of the sleeper, and solves the problem that the connecting line cannot be normally connected due to the height misalignment.

Description

Technical Field

[0001] The invention relates to the technical field of subway sleepers, in particular to a high-strength short subway sleeper and a preparation method thereof. Background Art

[0002] In urban rail transit systems, subway sleepers are key components of the track structure.

[0003] In the early days of subway construction, some sleepers were built using traditional railway sleeper technology. Traditional railway wooden sleepers were once widely used, and they have certain elasticity and insulation properties, but they gradually exposed many problems in the subway environment. For example, wooden sleepers are prone to decay and wear, and need to be replaced frequently, which not only increases maintenance costs, but also affects the normal operation of the subway. In addition, the strength and stability of wooden sleepers are insufficient when subjected to the high frequency and heavy loads of subway trains for a long time, which may cause changes in the geometric dimensions of the track and affect driving safety.

[0004] With the development of technology, concrete sleepers have begun to be used in subways. Concrete sleepers have high strength and stability, and can better maintain the geometry of the track. They have a long service life and reduce the maintenance work caused by sleeper damage. However, ordinary concrete sleepers have poor elasticity and cannot effectively buffer vibrations during the operation of subway trains, causing vibrations to be transmitted to the surrounding soil and buildings through the track structure, which may cause noise pollution and adverse effects on the surrounding environment. At the same time, this vibration will also aggravate the wear of vehicle and track components and reduce their service life.

[0005] At present, when subway sleepers reach the specified size, their tensile pull-out force can meet the requirement of 100kN. However, when the height of the railway track bed is seriously insufficient, the height of the sleepers needs to be compressed. After the compression, the sleepers cannot meet the corresponding tensile pull-out force requirements, which will pose a safety hazard. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides a high-strength short subway sleeper and a preparation method thereof, which can still meet the corresponding tensile strength requirements after the sleeper height is compressed.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a high-strength subway short sleeper and a preparation method thereof, comprising a steel plate base, three large steel bar frames are horizontally welded to the top of the steel plate base, four groups of small steel bar frames are welded together on the inner sides of the three large steel bar frames, concrete sleepers are cast at the top of the steel plate base and corresponding to the large steel bar frames and the small steel bar frames, fixing holes are opened at the diagonal points of the top of the concrete sleeper, the fixing holes are passed through to the bottom end of the steel plate base, a sleeve is cast and fixed on the inner side of the fixing hole, an external thread groove is opened at the lower part of the outer wall of the sleeve, and a steel sleeve is threadedly sleeved on the lower end of the sleeve.

[0008] Preferably, the outer diameter is larger than the inner diameter, the outer diameter of the steel sleeve is larger than the inner diameter of the fixing hole, a plurality of threaded holes are provided at the top of the steel plate base and on the outside of the concrete pillow, the thickness of the concrete pillow is 80 mm, the thickness of the steel plate base is 20 mm, and the top of the sleeve is 4 mm higher than the top of the concrete pillow.

[0009] Preferably, the concrete pillow specifically includes the following raw materials: cement, mineral powder, silica fume, quartz sand 1, quartz sand 2, admixture, steel fiber, and water.

[0010] Preferably, the raw materials are mixed in a weight ratio of 31.5:9.3:6.3:27.6:18.4:1:5.2:7.8.

[0011] Preferably, the preparation steps of the high-strength short subway sleeper are as follows:

[0012] S1, dry-mixing cement, mineral powder, silica fume, quartz sand 1 and quartz sand 2, and mixing them evenly to obtain a mixture;

[0013] S2, adding the admixture into water to obtain a mixed solution, and stirring evenly;

[0014] S3, adding the mixed liquid to the mixed material and stirring for 5 minutes;

[0015] S4, adding steel fibers, and continuing stirring for 5-10 minutes until the steel fibers are evenly distributed to obtain casting raw materials;

[0016] S5. Pour the casting material onto the steel plate base through a casting mold, and cure it in a natural environment for 28 days to fully solidify it to obtain a short rail sleeper.

[0017] Compared with the prior art, the present invention provides a high-strength short subway sleeper and a preparation method thereof, which has the following beneficial effects: the short sleeper obtained by the improved design of the present invention overcomes the problem that the casing pull-out force cannot reach the stress pull-out requirement of 100kN due to the insufficient height of the sleeper, and solves the problem that the connecting line cannot be connected normally due to the height misalignment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention;

[0019] Figure 2 It is a schematic diagram of the disassembled structure of the present invention.

[0020] In the figure: 1. Steel plate base; 11. Large steel frame; 12. Small steel frame;

[0021] 2. Concrete pillows;

[0022] 3. Casing; 31. Fixing hole; 32. External thread groove; 33. Steel sleeve. DETAILED DESCRIPTION

[0023] In the present invention, unless otherwise specified, the directions used, such as "up" and "down", usually refer to the directions shown in the drawings, or to the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the drawings; "inside" and "outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directions are not used to limit the present invention.

[0024] The following is a further detailed description of this application;

[0025] Table 1 shows the raw materials and manufacturers

[0026]

[0027] See also Figure 1-2 The present invention provides a technical solution for a high-strength short subway sleeper and a preparation method thereof:

[0028] Embodiment, a high-strength subway short sleeper and a preparation method thereof, comprising a steel plate base 1, three large steel bar frames 11 are welded transversely to the top of the steel plate base 1, four groups of small steel bar frames 12 are welded together on the inner sides of the three large steel bar frames 11, a concrete sleeper 2 is cast at the top of the steel plate base 1 and corresponding to the large steel bar frames 11 and the small steel bar frames 12, fixing holes 31 are opened at the diagonal points of the top of the concrete sleeper 2, the fixing holes 31 pass through to the bottom end of the steel plate base 1, a sleeve 3 is cast and fixed on the inner side of the fixing hole 31, an external thread groove 32 is opened at the lower part of the outer wall of the sleeve 3, and a steel sleeve 33 is threadedly sleeved on the lower end of the sleeve 3.

[0029] The outer diameter of the steel sleeve 33 is larger than the inner diameter of the fixing hole 31. A plurality of threaded holes are also provided at the top of the steel plate base 1 and on the outside of the concrete pillow 2. The thickness of the concrete pillow 2 is 80 mm, the thickness of the steel plate base 1 is 20 mm, and the top of the sleeve 3 is 4 mm higher than the top of the concrete pillow 2. When casting the concrete pillow 2, a forming mold is required. The forming mold belongs to the prior art and can be made according to the casting needs, so it will not be described in detail here.

[0030] The concrete pillow 2 specifically includes the following raw materials: cement, mineral powder, silica fume, quartz sand 1, quartz sand 2, admixture, steel fiber, and water;

[0031] The weight ratio of the raw materials is 31.5:9.3:6.3:27.6:18.4:1:5.2:7.8. It should be noted that the specific ratio is not limited to this ratio, and can also be other ratios that meet the requirements. This application will not go into details one by one.

[0032] The preparation steps of high-strength short subway sleepers are as follows:

[0033] S1, dry-mixing cement, mineral powder, silica fume, quartz sand 1 and quartz sand 2, and mixing them evenly to obtain a mixture;

[0034] S2, adding the admixture into water to obtain a mixed solution, and stirring evenly;

[0035] S3, adding the mixed liquid to the mixed material and stirring for 5 minutes;

[0036] S4, adding steel fibers, and continuing stirring for 5-10 minutes until the steel fibers are evenly distributed to obtain casting raw materials;

[0037] S5. Pour the casting raw material onto the steel plate base 1 through a casting mold, and cure it in a natural environment for 28 days to fully solidify it to obtain a short rail sleeper.

[0038] Experiment 1: Three samples were randomly selected from the short sleepers prepared in the embodiment as specimens, and the samples were numbered as BG-RPCDZ-20241013-1, BG-RPCDZ-20241013-2 and BG-RPCDZ-20241013-3, and the specimens were subjected to tensile pull-out test (tensile pull-out test equipment name: anchor tensile gauge, equipment model: ZY-300kN, manufacturer: Zhejiang Tuozhan Instrument Equipment Co., Ltd., for specific tensile pull-out test methods, see GB∕T 38695-2020 Technical Conditions for Ballastless Track of Urban Rail Transit P51-P52), and the specific test results are shown in Table 2:

[0039] Table 2 Pullout Test Report of Pre-embedded Casing in Sleepers

[0040]

[0041] It can be seen from the experimental results that the short sleeper prepared by the present invention can still meet the tensile strength requirement of 100 kN after the sleeper height is compressed.

[0042] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent replacements or modifications made based on the present invention to solve basically the same technical problems and achieve basically the same technical effects are all included in the protection scope of the present invention.

Claims

1. A high-strength short subway sleeper, characterized in that: The invention comprises a steel plate base (1), wherein three large steel bar frames (11) are welded transversely to the top of the steel plate base (1), and four groups of small steel bar frames (12) are welded together on the inner sides of the three large steel bar frames (11). A concrete platform pillow (2) is cast at the top of the steel plate base (1) and at the positions corresponding to the large steel bar frames (11) and the small steel bar frames (12). A fixing hole (31) is provided at the diagonal positions of the top of the concrete platform pillow (2), and the fixing hole (31) passes through to the bottom of the steel plate base (1). A sleeve (3) is cast and fixed on the inner side of the fixing hole (31), and an external thread groove (32) is provided at the lower part of the outer wall of the sleeve (3), and a steel sleeve (33) is threadedly sleeved on the lower end of the sleeve (3).

2. A high-strength short subway sleeper according to claim 1, characterized in that: The outer diameter of the steel sleeve (33) is greater than the inner diameter of the fixing hole (31); a plurality of threaded holes are provided at the top of the steel plate base (1) and on the outside of the concrete pillow (2); the thickness of the concrete pillow (2) is 80 mm; the thickness of the steel plate base (1) is 20 mm; and the top of the sleeve (3) is 4 mm higher than the top of the concrete pillow (2).

3. A high-strength short subway sleeper according to claim 1, characterized in that: The concrete pillow (2) specifically comprises the following raw materials: cement, mineral powder, silica fume, quartz sand 1, quartz sand 2, admixture, steel fiber, and water.

4. A high-strength short subway sleeper according to claim 3, characterized in that: The weight ratio of the raw materials is 31.5:9.3:6.3:27.6:18.4:1:5.2:7.

8.

5. The method for preparing a high-strength short subway sleeper according to any one of claims 1 to 4, characterized in that: The preparation steps of the high-strength short subway sleeper are specifically as follows: S1, dry-mixing cement, mineral powder, silica fume, quartz sand 1 and quartz sand 2, and mixing them evenly to obtain a mixture; S2, adding the admixture into water to obtain a mixed solution, and stirring evenly; S3, adding the mixed liquid to the mixed material and stirring for 5 minutes; S4, adding steel fibers, and continuing stirring for 5-10 minutes until the steel fibers are evenly distributed to obtain casting raw materials; S5. Casting the casting material onto the steel plate base (1) through a casting mold, curing in a natural environment for 28 days to fully solidify, and obtaining a short rail sleeper.

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