Prestressed BFRP reinforced concrete sleeper mold

Abstract

This utility model relates to the field of railway sleeper mold technology, specifically to a prestressed BFRP reinforced concrete railway sleeper mold, comprising a frame enclosed by a longitudinal beam, a tensioning end beam, and a fixed end beam. A tensioning mechanism is connected to the tensioning end beam, and a tensioning hanger is provided at the fixed end beam. A longitudinal mold is provided inside the frame. The key feature is that end plates are provided at both ends of the longitudinal mold. The end plates are assembled from an upper plate, a middle plate, and a lower plate. Arc-shaped grooves are formed on the adjacent end faces of the upper and middle plates, and arc-shaped grooves are also formed on the adjacent end faces of the middle and lower plates. The two opposing arc-shaped grooves form a through hole for the BFRP reinforcement to pass through. In use, the upper and middle plates are opened to place the corresponding BFRP reinforcements layer by layer without bending the BFRP reinforcements, thus effectively preventing fiber breakage and ensuring product quality.

Description

Technical Field

[0001] This utility model relates to the field of railway sleeper mold technology, specifically to prestressed BFRP reinforced concrete railway sleeper molds. Background Technology

[0002] Chinese utility model patent application number 202322758348.4—a prestressed railway sleeper mold—comprises longitudinal beams, tensioning end crossbeams, fixed end crossbeams, a tensioning mechanism, and a mold. The mold is positioned between two longitudinal beams, with tensioning end crossbeams and fixed end crossbeams at both ends. The tensioning mechanism is located at the tensioning end crossbeams for tensioning the reinforcing bars. The mold is equipped with a tensioning hanging plate and a grout-blocking diaphragm. Lifting holes are provided on the grout-blocking diaphragm for demolding via hoisting. The tensioning hanging plate and the grout-blocking diaphragm with lifting holes facilitate demolding. A longitudinal reinforcing beam is installed inside the mold to enhance its longitudinal strength. The lower ends of the longitudinal reinforcing beam are flush with the lower ends of the longitudinal beams and are in contact with the vibrating plate of the track slab vibration table to transmit vibration force, enabling the prestressed railway sleeper mold to adapt to the track slab production line.

[0003] This patent describes a method where the reinforcing bar is bent at a certain arc and its two ends are inserted into the through holes of a grout-blocking diaphragm. The reinforcing bar is then tensioned using a tensioning mechanism. Existing basalt fiber reinforced polymer (BFRP) bars, due to their high tensile strength, fatigue resistance, low density, and corrosion resistance, have become highly promising alternative materials for railway sleeper reinforcement. However, the bending strength of BFRP bars, i.e., their resistance to failure, is limited. If the bending angle is too large or the stress is improper when passing through the through hole, fiber breakage or matrix cracking may occur, affecting the quality of the railway sleeper. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a prestressed BFRP reinforced concrete sleeper mold. The technical problem it solves is that existing BFRP reinforcement has limited bending strength; if the bending angle is too large or the stress is improper when passing through the through-hole, fiber breakage or matrix cracking may occur, affecting the quality of the sleeper. To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: A prestressed BFRP reinforced concrete sleeper mold includes a frame enclosed by longitudinal beams, tensioning end beams, and fixed end beams. A tensioning mechanism is connected to the tensioning end beams, and a tensioning hanger is provided at the fixed end beams. A longitudinal mold is installed within the frame. The longitudinal mold is characterized by having: The end plate is composed of an upper plate, a middle plate and a lower plate. The adjacent end faces of the upper plate and the middle plate are provided with arc grooves, and the adjacent end faces of the middle plate and the lower plate are provided with arc grooves. The two opposite arc grooves form a through hole for the BFRP reinforcement to pass through. The connecting structure connects the upper plate, middle plate, and lower plate into a single end cap plate. Support plate, the support plate is set on the inner side of the longitudinal beam outside the end cap plate; The top block is installed between the support plate and the end plate by means of plugging and unplugging.

[0005] Furthermore, the lower edge of the upper plate and the upper edge of the middle plate are provided with a male-female groove insertion structure, and the lower edge of the middle plate and the upper edge of the lower plate are provided with a male-female groove insertion structure, which includes a protrusion and a groove.

[0006] Furthermore, the connecting structure includes a lug and a connecting plate, with the connecting plate connected to the lug by bolts; The three lugs are fixedly connected to the upper plate, middle plate and lower plate respectively.

[0007] Furthermore, the support plate is arranged in a mountain-shaped structure, and a reinforcing plate is provided between the middle of the support plate and the tensioning end crossbeam and the fixed end crossbeam.

[0008] Furthermore, the tensioning mechanism includes a tension rod, a tensioning box, and a sleeve A, with the tension rod connected to the sleeve A via the tensioning box; Sleeve B is hooked at the tensioning plate.

[0009] Furthermore, a support beam for supporting the longitudinal mold is fixedly installed between the two longitudinal beams.

[0010] Furthermore, a pad is fixedly installed on the upper end face of the longitudinal beam.

[0011] Furthermore, a slot is provided inside the pad, and a protrusion that engages with the slot is fixedly provided on the lower end face of the longitudinal beam.

[0012] Furthermore, both the slots and the protrusions are designed with a frustum structure.

[0013] Furthermore, both the slots and the protrusions are designed with a frustum structure.

[0014] The beneficial effects of this utility model are as follows: the end plate is composed of an upper plate, a middle plate and a lower plate. When in use, the upper plate and the middle plate are opened and the corresponding BFRP ribs are placed layer by layer. There is no need to bend the BFRP ribs, which can effectively prevent fiber breakage and ensure product quality.

[0015] By setting up connection structures and interlocking structures, cement slurry or mortar can be effectively prevented from leaking from the joints of the upper, middle and lower slabs, ensuring the density of the concrete.

[0016] By setting slots and bumps, it is convenient to stack molds while preventing them from slipping, which can reduce space occupation and improve safety. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is an exploded view of the end cap plate and connecting structure of this utility model; Figure 3 This is a top view of the structure of this utility model; Figure 4 This is a schematic diagram of the longitudinal mold, end plate, support plate, and top block of this utility model. In the picture: 1. Longitudinal beam, 2. Tensioning end crossbeam, 3. Fixed end crossbeam, 4. Tensioning mechanism, 41. Tensioning rod, 42. Tensioning box, 43. Sleeve A, 5. Tensioning hanging plate, 51. Sleeve B, 6. End plate, 61. Upper plate, 62. Middle plate, 63. Lower plate, 7. Arc groove, 8. Connecting structure, 9. Support plate, 10. Top block, 11. Protrusion, 12. Reinforcing plate, 13. Support beam, 14. Pad block, 15. Slot, 16. Protrusion, 17. Longitudinal mold. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the utility model will now be described in further detail with reference to the accompanying drawings and the following embodiments, so that the public can better understand the implementation method of this utility model. The specific implementation scheme of this utility model is as follows: A prestressed BFRP reinforced concrete sleeper mold includes a frame formed by a longitudinal beam 1, a tensioning end beam 2, and a fixed end beam 3. A tensioning mechanism 4 is connected to the tensioning end beam 2, and a tensioning hanging plate 5 is provided at the fixed end beam 3. A longitudinal mold 17 is provided inside the frame. The longitudinal mold 17 is characterized by having end plates 6 at both ends. The end plates 6 are assembled from an upper plate 61, a middle plate 62, and a lower plate 63. The adjacent end faces of the upper plate 61 and the middle plate 62 are provided with arc-shaped grooves 7, and the adjacent end faces of the middle plate 62 and the lower plate 63 are also provided with arc-shaped grooves 7. The two opposing arc-shaped grooves 7 form a through hole for the BFRP reinforcement to pass through. In use, the upper plate and the middle plate are opened to place the corresponding BFRP reinforcement layer by layer without bending the BFRP reinforcement, thereby effectively preventing fiber breakage and ensuring product quality.

[0019] The upper plate 61, middle plate 62 and lower plate 63 are connected into a whole end plate 6 by a connecting structure 8. The connecting structure 8 includes a lug 81 and a connecting plate 82. The connecting plate 82 is connected to the lug 81 by bolts. The three lugs 81 are fixedly connected to the upper plate 61, middle plate 62 and lower plate 63 respectively. That is, the upper plate 61, middle plate 62 and lower plate 63 are all fixedly connected with lugs 81. The lugs 81 are connected to the connecting plate 82 by bolts and nuts to ensure that the relative positions of the upper plate 61, middle plate 62 and lower plate 63 are fixed and to reduce splicing gaps.

[0020] Furthermore, the lower edge of the upper plate 61 and the upper edge of the middle plate 62 are provided with a tongue-and-groove interlocking structure, and the lower edge of the middle plate 62 and the upper edge of the lower plate 63 are also provided with a tongue-and-groove interlocking structure. The tongue-and-groove interlocking structure includes a protrusion 11 and a groove 12. The protrusion 11 and the groove 12 are stepped and can be interlocked after being spliced, which can effectively prevent cement slurry or mortar from flowing out of the splice joint and ensure the density of the concrete.

[0021] A support plate 9 is provided on the inner side of the longitudinal beam 1 on the outer side of the end plate 6. A top block 10 is provided between the support plate 9 and the end plate 6 to hold the end plate 6 in place and prevent the end plate 6 from being squeezed and displaced by the concrete.

[0022] It should be noted that the support plate 9 is arranged in a mountain-shaped structure, and a reinforcing plate 12 is provided between the middle of the support plate 9 and the tension end crossbeam 2 and the fixed end crossbeam 3 to improve the structural stability.

[0023] Specifically, the tensioning mechanism 4 includes a tensioning rod 41, a tensioning box 42, and a sleeve A43. The tensioning rod 41 is connected to the sleeve A43 through the tensioning box 42. A sleeve B51 is hooked at the tensioning hanging plate 5. Adhesive is injected into the sleeve A43 and the sleeve B51 to connect the BFRP bar with the sleeve A43 and the sleeve B51, ensuring that the BFRP bar is stretched during tensioning.

[0024] In order to support the longitudinal mold 17, a support beam 13 is fixedly installed between the two longitudinal beams 1.

[0025] Based on the above embodiments, in another embodiment, a pad 14 is fixedly provided on the upper end face of the longitudinal beam 1. In order to reduce space occupation and facilitate steam passage during mold stacking and curing.

[0026] It should be noted that the pad block 14 has a slot 15, and the lower end face of the longitudinal beam 1 is fixedly provided with a protrusion 16 that engages with the slot 15. When two or more layers are stacked, the protrusion 16 of the upper mold can be inserted into the slot 15 of the lower mold to prevent slippage and improve safety.

[0027] For ease of insertion, both slot 15 and protrusion 16 are designed as a truncated pyramid structure, or both slot 15 and protrusion 16 are designed as a frustum structure.

[0028] The working principle and process of this utility model are as follows: First, place the lower BFRP reinforcement in the slot 7 of the lower plate 63, then fasten the middle plate 62 onto the upper part of the lower plate 63, then place the upper BFRP reinforcement in the slot 7 of the middle plate 62, and finally fasten the upper plate 61 onto the upper part of the middle plate 62. Then, use bolts to connect the lug 81 and the connecting plate 82; place the top block 10 between the support plate 9 and the end plate 6.

[0029] The two ends of the BFRP bar extend into sleeves A41 and B51, and adhesive is injected into sleeves A41 and B51.

[0030] After the adhesive has solidified, when tensioning is performed, the tensioning machine pulls the tension rod 41, while the other end of the tensioning machine presses against the tensioning end beam 2. The tension rod 41 pulls the sleeve A43 through the tensioning box 42, thereby achieving the tensioning of the BFRP reinforcement.

[0031] After tensioning is completed, the molds are stacked together using a forklift. The protrusions 16 of the upper mold can be inserted into the slots 15 of the lower mold to prevent slippage and improve safety.

[0032] In the description of this utility model, it should be understood that the terms "center," "upper," "lower," "left," "right," "front," "rear," "lower left," "upper right," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Although this utility model has been described according to a limited number of embodiments, those skilled in the art should understand from the above description that other embodiments can be conceived within the scope of this utility model described herein.

Claims

1. A prestressed BFRP reinforced concrete sleeper mold, comprising a frame enclosed by a longitudinal beam (1), a tensioning end beam (2), and a fixed end beam (3), wherein a tensioning mechanism (4) is connected to the tensioning end beam (2), a tensioning hanging plate (5) is provided at the fixed end beam (3), and a longitudinal mold (17) is provided inside the frame, characterized in that, The longitudinal mold (17) has the following at both ends: The end plate (6) is composed of an upper plate (61), a middle plate (62) and a lower plate (63). The adjacent end faces of the upper plate (61) and the middle plate (62) are provided with slots (7), and the adjacent end faces of the middle plate (62) and the lower plate (63) are provided with slots (7). The two opposite slots (7) form a through hole for the BFRP reinforcement to pass through. The connecting structure (8) connects the upper plate (61), the middle plate (62) and the lower plate (63) into a whole end plate (6). Support plate (9) is set on the inner side of the longitudinal beam (1) outside the end cap plate (6); Top block (10) is installed between support plate (9) and end plate (6) in a plug-in manner.

2. The prestressed BFRP reinforced concrete sleeper mold according to claim 1, characterized in that: The lower edge of the upper plate (61) and the upper edge of the middle plate (62) are provided with a male-female groove insertion structure, and the lower edge of the middle plate (62) and the upper edge of the lower plate (63) are provided with a male-female groove insertion structure. The male-female groove insertion structure includes a protrusion (11) and a groove (12).

3. The prestressed BFRP reinforced concrete sleeper mold according to claim 1, characterized in that: The connecting structure (8) includes a lug (81) and a connecting plate (82), and the connecting plate (82) is connected to the lug (81) by bolts; The three lugs (81) are fixedly connected to the upper plate (61), middle plate (62) and lower plate (63) respectively.

4. The prestressed BFRP reinforced concrete sleeper mold according to claim 1, characterized in that: The support plate (9) is set in a mountain-shaped structure, and a reinforcing plate is set between the middle of the support plate (9) and the tension end crossbeam (2) and the fixed end crossbeam (3).

5. The prestressed BFRP reinforced concrete sleeper mold according to claim 1, characterized in that: The tensioning mechanism (4) includes a tensioning rod (41), a tensioning box (42), and a sleeve A (43). The tensioning rod (41) is connected to the sleeve A (43) through the tensioning box (42). A sleeve B (51) is hooked at the tensioning plate (5).

6. The prestressed BFRP reinforced concrete sleeper mold according to claim 1, characterized in that: A support beam (13) for supporting the longitudinal mold (17) is fixedly installed between the two longitudinal beams (1).

7. The prestressed BFRP reinforced concrete sleeper mold according to claim 1, characterized in that: A pad (14) is fixedly installed on the upper end face of the longitudinal beam (1).

8. The prestressed BFRP reinforced concrete sleeper mold according to claim 7, characterized in that: The pad (14) has a slot (15) inside, and the lower end face of the longitudinal beam (1) is fixedly provided with a protrusion (16) that is inserted into the slot (15).

9. The prestressed BFRP reinforced concrete sleeper mold according to claim 8, characterized in that: Both the slot (15) and the bump (16) are set with a quadrangular frustum structure.

10. The prestressed BFRP reinforced concrete sleeper mold according to claim 8, characterized in that: Both the slot (15) and the protrusion (16) are set with a frustum structure.

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