A dowel bar fixing structure for concrete slab expansion joints

Abstract

The application relates to a force transmission rod fixing structure for concrete slab expansion joints, and relates to the technical field of road expansion joint construction, which comprises a support frame, the inside of the support frame is provided with a sliding rod, and the surface of the sliding rod is movably connected with a sliding sleeve. The application is characterized in that the rotating shaft is driven to rotate through a knob, under the cooperation of the threaded column and the threaded pipe, the threaded pipe can drive the connecting rod to move axially along the fixed pipe, then the elastic steel sheet is driven to adaptively deform, the elastic steel sheet is accurately clamped into the positioning groove of the force transmission rod body, stable clamping is formed by using the elastic force of the elastic steel sheet, the force transmission rod body can be accurately fixed during the concrete pouring process, and the elastic steel sheet can be separated from the contact of the positioning groove by reversely rotating the knob. The components of the whole fixing structure are connected without loss, can be repeatedly used for the fixing operation of the force transmission rod of different concrete slab expansion joints, construction cost is reduced, and material waste is reduced.

Description

Technical Field

[0001] This application relates to the field of road expansion joint construction technology, and in particular to a dowel bar fixing structure for expansion joints in concrete slabs. Background Technology

[0002] Reinforced concrete pavement refers to a rigid pavement structure in which steel mesh is incorporated into the concrete surface layer to enhance its crack resistance, load-bearing capacity, and durability. It is widely used in heavy-duty traffic roads, airport runways, highway service areas, and pavements in special environments. Its core feature is that through the synergistic work of steel bars and concrete, it solves the problem of ordinary concrete pavements being prone to cracking due to temperature stress and load stress, thus extending the service life of the pavement. Currently, in the construction of reinforced concrete pavement, expansion joints are set to prevent pavement damage caused by the expansion or contraction of the pavement due to temperature changes. As an important component of expansion joints, the installation quality of dowel bars directly affects the smoothness and durability of the pavement.

[0003] However, existing devices are not convenient for precise fixing of dowel bars during concrete pouring, and cannot be reused for fixing dowel bars in expansion joints of different concrete slabs, resulting in construction costs and material waste. In order to solve the above problems, a dowel bar fixing structure for expansion joints of concrete slabs is proposed. Utility Model Content

[0004] The purpose of this application is to provide a dowel bar fixing structure for expansion joints in concrete slabs, which has the advantages of facilitating precise fixing of the dowel bar during concrete pouring and being able to be repeatedly used for fixing dowel bars in expansion joints of different concrete slabs.

[0005] This application provides a dowel bar fixing structure for expansion joints in concrete slabs, employing the following technical solution: A dowel bar fixing structure for expansion joints in concrete slabs includes a support frame, a sliding rod is provided inside the support frame, a sliding sleeve is movably connected to the surface of the sliding rod, an adjusting chamber is fixedly connected to the surface of the sliding sleeve, a bearing is fixedly connected to the surface of the adjusting chamber, a rotating shaft is rotatably connected inside the bearing, a threaded column is fixedly connected to the bottom end of the rotating shaft, a threaded tube is threadedly connected to the surface of the threaded column, a connecting rod is fixedly connected to the bottom end of the threaded tube, a fixing tube is fixedly connected to the lower surface of the adjusting chamber, the connecting rod passes through the interior of the fixing tube, an elastic steel sheet is fixedly connected to the bottom end of the connecting rod, the other end of the elastic steel sheet is fixedly connected to the surface of the fixing tube, a dowel bar body is provided below the adjusting chamber, a positioning groove is fixedly connected to the upper surface of the dowel bar body, and the positioning groove is fitted onto the surface of the elastic steel sheet.

[0006] By adopting the above technical solution, with the cooperation of the threaded column and the threaded tube, the threaded tube can drive the connecting rod to move along the axial direction of the fixed tube, thereby driving the elastic steel sheet to undergo adaptive deformation, so that the elastic steel sheet can be accurately inserted into the positioning groove of the dowel bar body. The elastic force of the elastic steel sheet forms a stable clamp, ensuring that the dowel bar body is accurately fixed during the concrete pouring process. The elastic steel sheet can be disengaged from the positioning groove by rotating the knob in the opposite direction. The components of the entire fixing structure are connected without loss, and it can be repeatedly used for dowel bar fixing operations in expansion joints of different concrete slabs, reducing construction costs and reducing material waste.

[0007] Preferably, a limiting tube is fixedly connected to the lower surface of the support frame, and a movable rod is inserted inside the limiting tube. The bottom end of the movable rod is fixedly connected to the upper surface of the sliding rod. There are two sets of the limiting tube and the movable rod, which are symmetrically arranged on the lower surface of the support frame.

[0008] By adopting the above technical solution, the two sets of symmetrically arranged limiting tubes cooperate with the movable rod to provide stable vertical guide support for the slide rod, limit the horizontal deviation of the slide rod, ensure that the slide rod always remains in a horizontal state, and thus ensure the horizontal movement accuracy of the sliding sleeve and the adjusting chamber.

[0009] Preferably, a first spring is sleeved on the surface of the limiting tube and the movable rod, the top end of the first spring rests on the lower surface of the support frame, and the bottom end of the first spring rests on the upper surface of the sliding rod.

[0010] By adopting the above technical solution, the first spring sleeved on the surface of the limiting tube and the movable rod can play an elastic buffering role. Under the vibration or construction load generated during the concrete pouring process, the first spring absorbs the impact energy through its own expansion and contraction, avoiding the vibration from causing the connection between the sliding rod and the support frame to loosen.

[0011] Preferably, a limiting groove is fixedly connected to the upper surface of the sliding sleeve, a limiting rod is inserted inside the limiting groove, and a second spring is sleeved on the surface of the limiting rod.

[0012] By adopting the above technical solution, the limiting rod in the limiting groove cooperates with the second spring to form an adjustable limiting mechanism. The elastic force of the second spring can push the limiting rod downward to apply pressure, so that the limiting rod and the slide rod are tightly fitted together, and the friction force restricts the accidental sliding of the sliding sleeve on the slide rod.

[0013] Preferably, a handle is fixedly connected to the top end of the limiting rod, and a clamping plate is fixedly connected to the bottom end of the limiting rod. An anti-slip pad is provided on the lower surface of the clamping plate.

[0014] By adopting the above technical solution, the handle at the top of the limiting rod provides the operator with a convenient point of force application, making it easy to quickly lift or press the limiting rod to adjust the position of the sliding sleeve and improve construction efficiency; the anti-slip pad on the lower surface of the clamping plate increases the coefficient of friction between the clamping plate and the sliding rod.

[0015] Preferably, the regulating chamber has a sliding groove inside, and a slider is fixedly connected to the surface of the threaded tube. There are two sets of sliders and sliding grooves, which are symmetrically arranged inside the regulating chamber.

[0016] By adopting the above technical solution, two sets of symmetrical sliding grooves and sliders cooperate to form a guiding structure, which can restrict the synchronous rotation of the threaded tube with the threaded column, so that when the threaded column rotates, the threaded tube can only make vertical linear movement along the direction of the sliding groove, ensuring that the connecting rod drives the elastic steel sheet to accurately move up and down, and avoiding the elastic steel sheet from being unable to accurately fit into the positioning groove due to offset.

[0017] Preferably, the slider is movably connected inside the groove, and a knob is fixedly connected to the top of the rotating shaft, with anti-slip textures on the surface of the knob.

[0018] By adopting the above technical solution, the sliding block is movably connected in the groove, which further enhances the reliability of the guide limit and avoids jamming when the threaded tube moves; the knob at the top of the rotating shaft and the anti-slip texture on the surface increase the friction between the hand and the knob.

[0019] Preferably, the lower surface of the support frame is fixedly connected with casters, there are two sets of casters, and they are symmetrically arranged on the lower surface of the support frame. The surface of the casters is provided with a braking mechanism.

[0020] By adopting the above technical solution, the two sets of symmetrical casters enable the support frame to move flexibly, making it easy to quickly adjust the overall position of the fixed structure according to the location of the expansion joint, thus reducing the difficulty of handling; the braking mechanism of the casters can lock the wheels after the structure is positioned to prevent the support frame from moving accidentally during construction.

[0021] In summary, this application includes at least one of the following beneficial technical effects: This is a dowel bar fixing structure for expansion joints in concrete slabs. A knob drives a rotating shaft, which, in conjunction with a threaded column and a threaded tube, causes the threaded tube to move the connecting rod axially along the fixing tube. This, in turn, causes the elastic steel sheet to deform adaptively, precisely engaging the sheet in the positioning groove of the dowel bar body. The elastic force of the steel sheet creates a stable clamping effect, ensuring the dowel bar body is accurately fixed during concrete pouring. Reversing the knob releases the elastic steel sheet from the positioning groove. The entire fixing structure features non-destructive connections between its components and can be repeatedly used for fixing dowel bars in expansion joints of different concrete slabs, reducing construction costs and material waste. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure as seen from the front in this application; Figure 2 This is a schematic diagram of the side cross-section of the regulating compartment in this application; Figure 3 This is a structural schematic diagram of the front cross-section of the sliding sleeve in this application; Figure 4 This is a three-dimensional structural diagram of the threaded pipe in this application; Figure 5 This is a three-dimensional structural diagram of the force transmission rod body of this application.

[0023] In the picture: 1. Support frame; 2. Limiting tube; 3. Movable rod; 4. First spring; 5. Sliding rod; 6. Sliding sleeve; 7. Adjustment chamber; 8. Bearing; 9. Rotating shaft; 10. Threaded column; 11. Threaded tube; 12. Connecting rod; 13. Fixing tube; 14. Elastic steel sheet; 15. Force transmission rod body; 16. Positioning groove; 17. Limiting groove; 18. Limiting rod; 19. Second spring; 20. Clamping plate; 21. Handle; 22. Universal wheel; 23. Sliding groove; 24. Sliding block; 25. Knob. Detailed Implementation

[0024] The following is in conjunction with the appendix Figure 1 - Appendix Figure 5 This application will be described in further detail below.

[0025] Example 1: A dowel bar fixing structure for expansion joints in concrete slabs, referring to... Figure 1 , Figure 2 and Figure 5The system includes a support frame 1, inside which is a slide rod 5. A slide sleeve 6 is movably connected to the surface of the slide rod 5. An adjusting chamber 7 is fixedly connected to the surface of the slide sleeve 6. A bearing 8 is fixedly connected to the surface of the adjusting chamber 7. A rotating shaft 9 is rotatably connected inside the bearing 8. A threaded column 10 is fixedly connected to the bottom end of the rotating shaft 9. A threaded tube 11 is threadedly connected to the surface of the threaded column 10. A connecting rod 12 is fixedly connected to the bottom end of the threaded tube 11. A fixed tube 13 is fixedly connected to the lower surface of the adjusting chamber 7. The connecting rod 12 passes through the interior of the fixed tube 13. An elastic steel sheet 14 is fixedly connected to the bottom end of the connecting rod 12. The other end of the elastic steel sheet 14 is fixedly connected to the surface of the fixed tube 13. A force transmission rod body 15 is located below the adjusting chamber 7. A positioning groove is fixedly connected to the upper surface of the force transmission rod body 15. 16. The positioning groove 16 is fitted onto the surface of the elastic steel sheet 14. The rotating shaft 9 is rotated by the knob 25. With the cooperation of the threaded column 10 and the threaded tube 11, the threaded tube 11 can drive the connecting rod 12 to move axially along the fixed tube 13, thereby driving the elastic steel sheet 14 to undergo adaptive deformation, so that the elastic steel sheet 14 is accurately inserted into the positioning groove 16 of the force transmission rod body 15. The elastic force of the elastic steel sheet 14 forms a stable clamp, ensuring that the force transmission rod body 15 is accurately fixed during the concrete pouring process. By rotating the knob 25 in the opposite direction, the elastic steel sheet 14 can be released from contact with the positioning groove 16. The components of the entire fixing structure are connected without loss, and it can be repeatedly used for fixing force transmission rods in expansion joints of different concrete slabs, reducing construction costs and material waste.

[0026] Please see Figure 1 , Figure 2 and Figure 3 A limiting tube 2 is fixedly connected to the lower surface of the support frame 1. A movable rod 3 is inserted inside the limiting tube 2. The bottom end of the movable rod 3 is fixedly connected to the upper surface of the slide rod 5. There are two sets of limiting tubes 2 and movable rods 3, which are symmetrically arranged on the lower surface of the support frame 1. The two sets of symmetrically arranged limiting tubes 2 and movable rods 3 cooperate to provide stable vertical guide support for the slide rod 5, restrict the horizontal displacement of the slide rod 5, and ensure that the slide rod 5 always remains horizontal, thereby ensuring the horizontal movement accuracy of the sliding sleeve 6 and the adjusting chamber 7. A first spring 4 is sleeved on the surface of the limiting tube 2 and the movable rod 3. The top end of the first spring 4 overlaps the lower surface of the support frame 1, and the bottom end of the first spring 4 overlaps the upper surface of the slide rod 5. The first spring 4 sleeved on the surface of the limiting tube 2 and the movable rod 3 can play an elastic buffering role. Under the vibration generated during concrete pouring or construction load, the first spring 4 absorbs the impact energy through its own expansion and contraction, preventing the vibration from causing the connection between the slide rod 5 and the support frame 1 to loosen.

[0027] Please see Figure 1 , Figure 2 and Figure 3A limiting groove 17 is fixedly connected to the upper surface of the sliding sleeve 6. A limiting rod 18 is inserted inside the limiting groove 17. A second spring 19 is sleeved on the surface of the limiting rod 18. The limiting rod 18 and the second spring 19 in the limiting groove 17 cooperate to form an adjustable limiting mechanism. The elastic force of the second spring 19 can push the limiting rod 18 downward to apply pressure, so that the limiting rod 18 and the sliding rod 5 are tightly fitted. The friction force restricts the accidental sliding of the sliding sleeve 6 on the sliding rod 5. A handle 21 is fixedly connected to the top of the limiting rod 18, and a clamping plate 20 is fixedly connected to the bottom of the limiting rod 18. An anti-slip pad is provided on the lower surface of the clamping plate 20. The handle 21 at the top of the limiting rod 18 provides a convenient force point for the operator, making it easy to quickly lift or press the limiting rod 18 to adjust the position of the sliding sleeve 6 and improve construction efficiency. The anti-slip pad on the lower surface of the clamping plate 20 increases the coefficient of friction between the clamping plate 20 and the sliding rod 5.

[0028] Please see Figure 1 , Figure 2 and Figure 4 The regulating chamber 7 has a sliding groove 23 inside. A slider 24 is fixedly connected to the surface of the threaded tube 11. There are two sets of sliders 24 and sliding grooves 23, which are symmetrically arranged inside the regulating chamber 7. The two sets of symmetrical sliding grooves 23 and sliders 24 cooperate to form a guide structure, which can restrict the synchronous rotation of the threaded tube 11 with the threaded column 10. When the threaded column 10 rotates, the threaded tube 11 can only move vertically in a straight line along the direction of the sliding groove 23. This ensures that the connecting rod 12 drives the elastic steel sheet 14 to move up and down accurately, and prevents the elastic steel sheet 14 from failing to accurately engage with the positioning groove 16 due to offset. The slider 24 is movably connected inside the sliding groove 23. A knob 25 is fixedly connected to the top of the rotating shaft 9. The surface of the knob 25 has anti-slip texture. The slider 24 is movably connected within the groove 23, further enhancing the reliability of the guide limit and preventing jamming when the threaded tube 11 moves. The knob 25 at the top of the rotating shaft 9 and the anti-slip texture on its surface increase the friction between the hand and the knob 25. Two sets of casters 22 are fixedly connected to the lower surface of the support frame 1, and they are symmetrically arranged on the lower surface of the support frame 1. The casters 22 are equipped with a braking mechanism. The two sets of symmetrical casters 22 enable the support frame 1 to move flexibly, making it easy to quickly adjust the overall position of the fixed structure according to the expansion joint position and reducing the difficulty of handling. The braking mechanism of the casters 22 can lock the wheel body after the structure is positioned to prevent the support frame 1 from moving accidentally during construction.

[0029] The implementation principle of this application embodiment is as follows: First, the entire structure is moved to the designed position of the concrete slab expansion joint by using the universal wheels 22 on the lower surface of the support frame 1. Then, the brake mechanism of the universal wheels 22 is operated to lock the wheels, so that the support frame 1 remains horizontal and firmly fixed, providing a stable foundation for the subsequent structure. The operator moves the limit rod 18 upward, so that the clamping plate 20 is disengaged from the surface of the slide rod 5. At this time, the sliding sleeve 6 can be slid along the slide rod 5 to move the adjustment chamber 7 to the preset position where the force transmission rod body 15 needs to be fixed. After releasing the handle 21, the second spring 19 returns to its original position and pushes the limit rod 18 downward, so that the clamping plate 20 is tightly attached to the slide rod 5 through the anti-slip pad. The position of the sliding sleeve 6 is fixed by friction. The force transmission rod body 15 is placed below the adjustment chamber 7, so that the positioning groove 16 is positioned. The elastic steel sheet 14 is fitted onto the surface of the elastic steel sheet 14. Then, the rotating shaft 9 is rotated by the knob 25. With the cooperation of the threaded column 10 and the threaded tube 11, the threaded tube 11 drives the connecting rod 12 to move upward along the inside of the fixed tube 13. The connecting rod 12 pushes one end of the elastic steel sheet 14 to move upward. After the elastic steel sheet 14 undergoes elastic deformation, it is stuck into the positioning groove 16, forming a firm fixation on the force transmission rod body 15. When the concrete solidifies, the rotating shaft 9 is rotated in the opposite direction. At the same time, the threaded column 10 drives the threaded tube 11 to move downward, so that the connecting rod 12 pulls the elastic steel sheet 14 to disengage from the positioning groove 16. Then, the sliding rod 5 is pulled upward so that the adjusting chamber 7 drives the connecting rod 12 to disengage from the force transmission rod body 15. Finally, the support frame 1 is moved. After cleaning, all parts can be recycled for subsequent construction.

Claims

1. A dowel bar fixing structure for expansion joints in concrete slabs, comprising a support frame (1), characterized in that: The support frame (1) is provided with a slide rod (5) inside. A slide sleeve (6) is movably connected to the surface of the slide rod (5). An adjustment chamber (7) is fixedly connected to the surface of the slide sleeve (6). A bearing (8) is fixedly connected to the surface of the adjustment chamber (7). A rotating shaft (9) is rotatably connected inside the bearing (8). A threaded column (10) is fixedly connected to the bottom end of the rotating shaft (9). A threaded tube (11) is threadedly connected to the surface of the threaded column (10). A connecting rod (12) is fixedly connected to the bottom end of the threaded tube (11), and a fixed tube (13) is fixedly connected to the lower surface of the adjusting chamber (7). The connecting rod (12) passes through the inside of the fixed tube (13). An elastic steel sheet (14) is fixedly connected to the bottom end of the connecting rod (12). The other end of the elastic steel sheet (14) is fixedly connected to the surface of the fixed tube (13). A force transmission rod body (15) is provided below the adjusting chamber (7). A positioning groove (16) is fixedly connected to the upper surface of the force transmission rod body (15). The positioning groove (16) is sleeved on the surface of the elastic steel sheet (14).

2. The dowel bar fixing structure for expansion joints in concrete slabs according to claim 1, characterized in that: The lower surface of the support frame (1) is fixedly connected to a limiting tube (2), and a movable rod (3) is inserted inside the limiting tube (2). The bottom end of the movable rod (3) is fixedly connected to the upper surface of the slide rod (5). There are two sets of the limiting tube (2) and the movable rod (3), which are symmetrically arranged on the lower surface of the support frame (1).

3. The dowel bar fixing structure for expansion joints in concrete slabs according to claim 2, characterized in that: The surfaces of the limiting tube (2) and the movable rod (3) are fitted with a first spring (4), the top end of the first spring (4) is attached to the lower surface of the support frame (1), and the bottom end of the first spring (4) is attached to the upper surface of the slide rod (5).

4. The dowel bar fixing structure for expansion joints in concrete slabs according to claim 1, characterized in that: The upper surface of the sliding sleeve (6) is fixedly connected to a limiting groove (17), and a limiting rod (18) is inserted inside the limiting groove (17). A second spring (19) is sleeved on the surface of the limiting rod (18).

5. A dowel bar fixing structure for expansion joints in concrete slabs according to claim 4, characterized in that: The top end of the limiting rod (18) is fixedly connected to a handle (21), and the bottom end of the limiting rod (18) is fixedly connected to a clamping plate (20). The lower surface of the clamping plate (20) is provided with an anti-slip pad.

6. The dowel bar fixing structure for expansion joints in concrete slabs according to claim 1, characterized in that: The regulating chamber (7) has a sliding groove (23) inside, and a slider (24) is fixedly connected to the surface of the threaded tube (11). There are two sets of sliders (24) and sliding grooves (23), which are symmetrically arranged inside the regulating chamber (7).

7. A dowel bar fixing structure for expansion joints in concrete slabs according to claim 6, characterized in that: The slider (24) is movably connected inside the groove (23), and a knob (25) is fixedly connected to the top of the rotating shaft (9). The surface of the knob (25) is provided with anti-slip texture.

8. A force transmission bar fixing structure for expansion joints in concrete slabs according to claim 1, characterized in that: The lower surface of the support frame (1) is fixedly connected with casters (22). There are two sets of casters (22), which are symmetrically arranged on the lower surface of the support frame (1). The surface of the casters (22) is provided with a braking mechanism.

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