Rail sleeper prestressed BFRP tendon fixing structure

Abstract

The utility model relates to prestressed sleeper technical field, concretely relates to a kind of sleeper prestress BFRP tendon fixing structure, including tensioning rod, tensioning rod is connected with tensioning box, and a plurality of through holes of preset quantity are opened along horizontal in tensioning box, clamping tube with cavity is inserted in through hole, and clamping tube is formed by two half pipes detachably enclosed, and the internal space formed by enclosing is cavity, glue injection chamber is opened in cavity inner wall, glue injection chamber is communicated with outside by glue injection port opened in half pipe side wall, adhesive enters glue injection chamber and is wrapped in BFRP tendon outside by glue injection port, and connecting piece is provided at one end of clamping tube and passes through through hole;One of half pipe is connected with top bolt by screw thread, and top bolt inner end surface can abut on the side wall of another half pipe to open clamping tube, after use, two half pipes are opened by top bolt, it is convenient to operate, and the distribution of adhesive inside clamping tube can be directly observed, and the working efficiency of scraping is improved.

Description

Technical Field

[0001] This utility model relates to the field of prestressed railway sleeper technology, specifically to a prestressed BFRP reinforcement fixing structure for railway sleepers. Background Technology

[0002] The key technology for applying prestress to BFRP (Browser-Fiber Reinforced Plastic) bars lies in anchoring technology. Traditional mechanical clamp anchoring tensioning methods are prone to failure due to the weak shear resistance of BFRP bars and their transverse compressive strength being much lower than their longitudinal tensile strength, especially when the tension value is too high, due to the notch effect. Therefore, adhesive anchors are used for fixing, mainly composed of clamping tubes and adhesives. The main function of the clamping tubes is to constrain the adhesive and connect the anchor to the tensioning mechanism; the function of the adhesive is to form a bond with the anchor, improving its anchoring performance.

[0003] After use, the adhesive and BFRP ribs inside the fixture are usually cleaned by heating. This involves using a heat gun, blowtorch, or other heating equipment to heat the sleeve fixture. Once the adhesive softens, the excess BFRP ribs are pulled out. Then, a tool is used to carefully scrape off the adhesive from the inner wall of the sleeve. Because the space inside the sleeve is relatively small, the cleaning efficiency is slow, and it is easy to miss some ribs, affecting subsequent use. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides a prestressed BFRP reinforcement fixing structure for railway sleepers. The technical problems it solves are: the internal space of the sleeve is relatively small, resulting in low cleaning efficiency; and it is easy to miss items, affecting subsequent use. To solve the above technical problems, the technical solution adopted by this utility model is: A prestressed BFRP reinforcement fixing structure for railway sleepers, characterized in that it comprises: Tension lever; The tension box is connected to the tension rod, and the tension box has a preset number of through holes along the horizontal direction; A clamping tube with a cavity, the clamping tube is formed by two detachable half tubes, and a connector is provided at one end of the clamping tube through a through hole; The glue injection chamber is located on the inner wall of the cavity, and the glue injection chamber is recessed into the inner wall of the cavity. The glue injection port is located on the side wall of the half-pipe and is connected to the glue injection chamber. The jacking bolt is threaded to one half-pipe, and the inner end face of the jacking bolt can abut against the side wall of the other half-pipe to open the clamping tube.

[0005] Furthermore, the connector is a nut, which is connected to the clamping tube by threads.

[0006] Furthermore, the half-tube includes a half-tube body, a semi-circular connecting head, and a semi-stud that are fixedly connected in sequence. The two semi-studs form a complete stud that is threadedly connected to a nut. A groove is provided at the end of the through hole away from the nut, and the groove fits snugly against the arc-shaped sidewall of the semi-circular connecting head.

[0007] Furthermore, the opposite sidewalls on both sides of the semi-tube are provided with a male-female groove structure, which includes matching protrusions and grooves.

[0008] Furthermore, the sidewall of the semi-pipe is provided with a square welded nut through a fixed structure, and the square welded nut and the jacking bolt are engaged by threads.

[0009] Furthermore, a chamfered structure is provided at the connection between the injection chamber and the container.

[0010] Furthermore, the outer wall of the glue injection port is equipped with a glue injection nozzle.

[0011] Furthermore, the tensioning rod and the tensioning box are connected by threads.

[0012] The beneficial effects of this utility model are as follows: the clamping tube is designed as two detachable half tubes. After use, the two half tubes can be opened by using the opening bolts, which is convenient to operate and allows for a direct view of the distribution of adhesive inside the clamping tube, thus improving the efficiency of scraping.

[0013] By setting up connectors, the need for tension can be met, and the two half-tubes can be fixed into a whole.

[0014] By using the semi-circular connector to engage with the groove, the teeth of the two studs can be quickly aligned to ensure a threaded connection with the nut and improve docking efficiency. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is a schematic diagram of the exploded cross-section of the clamping tube of this utility model; Figure 3 This is a schematic diagram of an embodiment of the present utility model; In the picture: 1. Tensioning rod, 2. Tensioning box, 3. Through hole, 4. Cavity, 5. Clamping tube, 51. Half-pipe body, 52. Semi-circular connecting head, 53. Semi-stud, 6. Connecting piece, 7. Glue injection chamber, 8. Top bolt, 9. Groove body, 10. Mother-daughter groove structure, 11. Square welding nut, 12. Chamfered structure, 13. Glue injection nozzle. Detailed Implementation

[0016] 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 bronze reinforced plastic (BFRP) reinforcement fixing structure for railway sleepers includes a tension rod 1 connected to a tension box 2. The tension box 2 has a predetermined number of through holes 3 horizontally. A clamping tube 5 with a cavity 4 is inserted into each through hole 3. The clamping tube 5 is formed by two detachably enclosed halves of a tube, creating the cavity 4. The cavity 4 holds the BFRP reinforcement. An adhesive injection chamber 7 is formed on the inner wall of the cavity 4. The adhesive injection chamber 7 communicates with the outside through an injection port on the side wall of the half-tube. Adhesive enters the adhesive injection chamber 7 through the injection port and coats the BFRP reinforcement. Because the adhesive injection chamber 7 is recessed within the inner wall of the cavity 4 (i.e., its diameter is larger than the diameter of the cavity 4), the solidified adhesive is blocked from being pulled out. One end of the clamping tube 5 passes through the through hole 3 and is fitted with a connector 6, which serves two purposes: to meet the tensioning requirements and to fix the two halves of the tube into a single unit.

[0017] One half of the tube is connected to a push-opening bolt 8 by a thread. The inner end face of the push-opening bolt 8 can abut against the side wall of the other half of the tube to open the clamping tube 5. After use, the two half tubes can be opened by using the push-opening bolt 8. The operation is convenient and the distribution of adhesive inside the clamping tube can be seen directly, which improves the efficiency of scraping.

[0018] It should be noted that connector 6 is a nut, which is connected to clamping tube 5 by threads. Specifically, a groove 9 is provided at one end of the through hole 3 away from the connector 6. The groove 9 is set in a frustum structure. The half tube includes a half tube body 51, a frustum connector 52 and a stud 53 that are fixedly connected in sequence. The glue injection chamber 7 is opened in the inner wall of the half tube body 51. The arc-shaped side wall of the frustum connector 52 fits against the arc-shaped side wall of the groove 9 to ensure that the two frustum connectors 52 and the two studs 53 are coaxial, so as to connect and align the teeth of the two studs, and ensure that the two studs 53 form a complete stud and are threadedly connected to the nut, thereby improving the docking efficiency.

[0019] It should be noted that the opposite sidewalls on both sides of the semi-tube 51 are provided with a male-female groove structure 10, which includes matching protrusions and grooves. This design facilitates the fastening of the two semi-tubes 51.

[0020] Specifically, the side wall of the semi-tube 51 is provided with a square welded nut 11 by means of a fixed structure, and the square welded nut 11 and the top bolt 8 are engaged by threads.

[0021] To facilitate the cleaning of softened adhesive, a chamfered structure 12 is provided at the connection between the glue injection chamber 7 and the cavity 4. Similarly, a chamfered structure can also be provided inside the cavity 4 to reduce cleaning dead corners.

[0022] To facilitate connection with the glue injection tube, a glue injection nozzle 13 is provided on the outer wall of the glue injection port half of the tube.

[0023] Tensioning rod 1 and tensioning box 2 are connected by threads for easy adjustment.

[0024] The working principle and process of this utility model are as follows: The BFRP bar is inserted into the semi-tube 51, and then adhesive is injected into the injection chamber 7 through the injection nozzle 13. The adhesive wraps around the outside of the BFRP bar. After solidification, the tensioning machine pulls the tensioning rod 1, which pulls the tensioning box 2. Due to the obstruction of the nut 6, the tensioning box 2 can pull the clamping tube 5, which in turn pulls the BFRP bar for tensioning.

[0025] After tensioning is completed, cut the BFRP reinforcement between the sleeper mold and the clamping tube 5, unscrew the nut 6, and pull the clamping tube 5 out from one side of the through hole 3. Then rotate the jacking bolt 8 to move it inward until the inner end face of the jacking bolt 8 touches the inner wall of the other half tube, giving a push to the half tube on one side to separate the two half tubes. Then use a blowtorch to heat the clamping tube 5, soften the adhesive, and clean it.

[0026] 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 limiting 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 fixing structure for prestressed BFRP reinforcement in railway sleepers, characterized in that, include: Tensioner rod (1); Tensioning box (2), tensioning box (2) is connected to tensioning rod (1), and tensioning box (2) has a preset number of through holes (3) along the horizontal direction. A clamping tube (5) with a cavity (4) is formed by two detachable half tubes. One end of the clamping tube (5) passes through the through hole (3) and is provided with a connector (6). The injection chamber (7) is located on the inner wall of the cavity (4) and is recessed into the inner wall of the cavity (4); The glue injection port is located on the side wall of the half-pipe and is connected to the glue injection chamber (7); The opening bolt (8) is threadedly connected to one half-pipe, and the inner end face of the opening bolt (8) can abut against the side wall of the other half-pipe to open the clamping tube (5).

2. The sleeper prestressed BFRP reinforcement fixing structure according to claim 1, characterized in that: The connector (6) is a nut, which is connected to the clamping tube (5) by threads.

3. The sleeper prestressed BFRP reinforcement fixing structure according to claim 2, characterized in that: The half-pipe includes a half-pipe body (51), a semi-circular connecting head (52), and a half-stud (53) that are fixedly connected in sequence. The two half-studs (53) form a complete stud that is threadedly connected to a nut. A groove (9) is provided at one end of the through hole (3) away from the nut. The groove (9) fits well with the arc-shaped side wall of the semi-circular frustum connector (52).

4. The sleeper prestressed BFRP reinforcement fixing structure according to claim 3, characterized in that: The opposite sidewalls on both sides of the semi-tube (51) are provided with a male-female groove structure (10), which includes matching protrusions and grooves.

5. A sleeper prestressed BFRP reinforcement fixing structure according to claim 1, characterized in that: The sidewall of the half-pipe is provided with a square welded nut (11) by means of a fixed structure. The square welded nut (11) and the top bolt (8) are engaged by threads.

6. The sleeper prestressed BFRP reinforcement fixing structure according to claim 1, characterized in that: A chamfered structure (12) is provided at the connection between the glue injection chamber (7) and the cavity (4).

7. The sleeper prestressed BFRP reinforcement fixing structure according to claim 1, characterized in that: The outer wall of the half-pipe of the glue injection port is provided with a glue injection nozzle (13).

8. The sleeper prestressed BFRP reinforcement fixing structure according to claim 1, characterized in that: The tension rod (1) and the tension box (2) are connected by threads.

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