Tensioning device of rib material and laying method of rewrapping reinforcement layer

Abstract

The invention discloses a tensioning device of a rib material and a laying method of a wrapped reinforced layer, belongs to the technical field of reinforced retaining walls, and is used for solving the problem that in the prior art, due to insufficient tensioning of the rib material in an opposite-pulling type reinforced retaining wall, the self deformation control capability of the opposite-pulling type reinforced retaining wall is low. According to the tensioning device, a clamping roller set comprises an upper clamping roller, a lower clamping roller, an upper roller support and a lower roller support, a long-strip-shaped upper roller groove is formed in the upper roller support, a roller shaft of the upper clamping roller is inserted into the upper roller groove and is rotationally connected with the upper roller groove, a long-strip-shaped lower roller groove is formed in the lower portion of the lower roller support, and the upper roller support is rotationally connected with the lower roller support. A roller shaft of the lower clamping roller is inserted into the lower roller groove and is rotationally connected with the lower roller groove; the connecting end of the upper roller support and the connecting end of the lower roller support are both connected with the connecting end of the tensioning belt, and the winding end of the tensioning belt is wound on the tensioning rolling shaft. The device can be used for tensioning the rib material.

Description

Technical Field

[0001] This invention belongs to the technical field of reinforced retaining walls, and in particular, a tensioning device for reinforcing bars and a method for laying a reinforcing layer. Background Technology

[0002] With the rapid development of my country's transportation infrastructure, the contradiction between the requirements for engineering safety and stability and the constraints of land resources has become increasingly prominent. As an important branch of double-sided reinforced soil structures, the tie-bar reinforced soil retaining wall relies on a bidirectional reinforcement mechanism through which reinforcement materials penetrate the cross-section of the structure. This mechanism anchors the nearly vertical wall panels on both sides and balances the lateral earth pressure on the fill material. This structure achieves highly safe fill support in confined spaces and has become a key technology for alleviating land resource constraints.

[0003] However, the traditional tension-reinforced soil retaining wall system lacks a pre-tensioning process during reinforcement installation, resulting in the reinforcement being in a relaxed state upon completion of the filling. This relaxed state gradually tightens as the height of the overlying soil increases. This passive tensioning of the reinforcement after construction prevents it from immediately providing effective constraint, ultimately reducing the deformation control capability of the tension-reinforced soil retaining wall. Summary of the Invention

[0004] Based on the above analysis, the embodiments of the present invention aim to provide a tensioning device for reinforcing bars and a method for laying a back-reinforcing layer, in order to solve the problem that insufficient tensioning of reinforcing bars in tie-reinforced soil retaining walls leads to low deformation control capability of tie-reinforced soil retaining walls in the prior art.

[0005] The objective of this invention is mainly achieved through the following technical solutions.

[0006] The present invention provides a tensioning device for reinforcing bars in reinforced soil retaining walls, comprising a tensioning roller, a tensioning belt, and a set of clamping rollers for clamping the ends of the reinforcing bars; The clamping roller assembly includes an upper clamping roller, a lower clamping roller, an upper roller bracket, and a lower roller bracket. The upper roller bracket has an elongated upper roller groove, and the roller shaft of the upper clamping roller is inserted into the upper roller groove and rotatably connected to the upper roller groove. The lower roller bracket has an elongated lower roller groove, and the roller shaft of the lower clamping roller is inserted into the lower roller groove and rotatably connected to the lower roller groove. Both the connecting ends of the upper roller bracket and the lower roller bracket are connected to the connecting end of the tensioning belt, and the winding end of the tensioning belt is wound around the tensioning roller.

[0007] Furthermore, the distance between the upper roller groove and the lower roller groove gradually decreases along the direction that moves away from the connecting end of the upper roller bracket and / or the connecting end of the lower roller bracket.

[0008] Furthermore, the outer walls of both the upper and lower clamping rollers are provided with friction layers.

[0009] Furthermore, the tensioning device also includes a fixing plate for fixing two adjacent layers of reinforcing bars.

[0010] Furthermore, the tensioning device also includes a transition connector, which includes a connecting bracket and a connecting ring. One end of the connecting bracket is fixedly connected to the connecting end of the upper roller bracket, and the other end of the connecting bracket passes through the connecting ring radially and is fixedly connected to the connecting end of the lower roller bracket. The connecting end of the tensioning belt is fixedly connected to the connecting ring.

[0011] Furthermore, the upper roller bracket, lower roller bracket, and connecting bracket are formed as a single unit.

[0012] Furthermore, the tensioning device also includes a mounting plate and a mounting bracket; The mounting plate is located on the outside of the composite panel of the reinforced soil retaining wall; One end of the mounting bracket is fixedly connected to the mounting plate, and the other end is rotatably connected to the tensioning roller.

[0013] Furthermore, the tensioning device also includes a stress display and a resistive strain gauge. The resistive strain gauge is located on or inside the tensioning belt and deforms synchronously with the tensioning belt. The stress display is connected to the resistive strain gauge.

[0014] The present invention also provides a method for laying a back-wrapped tension reinforcement layer, using the above-mentioned tensioning device for the reinforcement material, and the laying method includes the following steps: Step 1: Lay the lower layer of reinforcing bars and form a wrap-around structure at both ends of the lower layer of reinforcing bars; Step 2: Lay a foundation fill layer between the upper surface of the lower reinforcement and the back-wrap structure at both ends, with the upper surface of the foundation fill layer lower than the upper surface of the back-wrap structure; Step 3: Lay the upper layer of reinforcing material; Step 4: Set up the tensioning device, place the end of the upper layer of reinforcement between the upper clamping roller and the lower clamping roller, and make the upper clamping roller and the lower clamping roller contact with the reinforcement; Step 5: Rotate the tensioning roller to increase the length of the tensioning belt wound on the tensioning roller. The upper roller support and the lower roller support move away from the center of the upper reinforcement under the drive of the tensioning belt. The upper clamping roller and the lower clamping roller move closer to each other to clamp the ends of the upper reinforcement. Step 6: Continue to rotate the tensioning roller to increase the length of the tensioning strip wound on the tensioning roller. Driven by the clamping roller group, the end of the upper reinforcement moves towards the tensioning roller. The upper reinforcement is suspended above the foundation fill layer, completing the tensioning of the upper reinforcement. Step 7: After completing the tensioning of the upper layer of reinforcement, use a fixing plate to connect and fix the upper and lower layer of reinforcement, and remove the tensioning device of the reinforcement through the drainage holes of the composite panel.

[0015] Step 8: Between the upper reinforcement and the foundation fill layer, the surface fill layer is laid through the gaps of the upper reinforcement or directly compacted on top of the upper reinforcement. The surface fill layer and the foundation fill layer constitute the interlayer fill layer of the back-wrapped tie reinforcement layer.

[0016] Furthermore, in step 2, the height difference between the upper surface of the foundation fill layer and the upper surface of the backfill structure is 4 cm to 5 cm.

[0017] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects: A) The tensioning device for reinforcing bars provided by this invention allows engineers to fully tension the reinforcing bars during the laying process, applying lateral prestress so that the reinforcing bars are in a taut state in the early stages of filling. This effectively avoids the problem of passive tension caused by the relaxation of reinforcing bars in traditional construction methods. This active tensioning mechanism can significantly improve the initial stability of the tension-reinforced soil retaining wall. By allowing the reinforcing bars to undergo elastic strain in advance, prestress is established in the reinforcing bars, enhancing the overall ability of the structure to resist lateral deformation.

[0018] B) The tensioning device for reinforcing bars provided by the present invention can achieve precise control and dynamic adjustment of tension force through the synergistic effect of mechanical clamping and roller transmission, providing a reliable technical guarantee for high-stability filling projects under narrow space conditions.

[0019] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the description or be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained through the embodiments described and the accompanying drawings, which are particularly pointed out. Attached Figure Description

[0020] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts. Figure 1 This is a schematic diagram of the tensioning device for reinforcing bars provided in Embodiment 1 of the present invention; Figure 2 This is a front view of the tensioning device for reinforcing bars provided in Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the structure of the fixing plate in the tensioning device for reinforcing bars provided in Embodiment 1 of the present invention; Figure 4This is a schematic diagram of the tensioning device for reinforcing bars provided in Embodiment 2 of the present invention.

[0021] Figure label: 1-Tensioning roller; 2-Tensioning belt; 3-Upper clamping roller; 4-Lower clamping roller; 5-Upper roller bracket; 6-Lower roller bracket; 7-Upper roller groove; 8-Lower roller groove; 9-Plate body; 10-Connecting hook; 11-Protrusion; 12-Connecting bracket; 13-First half ring; 14-Second half ring; 15-First pull ring; 16-Second pull ring; 17-Mounting plate; 18-Mounting bracket; 19-Stress indicator; 20-Composite panel; 21-Reinforcing bar. Detailed Implementation

[0022] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0023] Example 1 This embodiment provides a tensioning device for reinforcing bars, used for tensioning the reinforcing bars 21 in a reinforced soil retaining wall. See [link / reference]. Figures 1 to 2 It includes a tensioning roller 1, a tensioning belt 2 (e.g., a polyethylene tensioning belt), and a clamping roller assembly for clamping the ends of the reinforcing bar 21; wherein, the clamping roller assembly includes an upper clamping roller 3, a lower clamping roller 4, an upper roller bracket 5, and a lower roller bracket 6. The upper roller bracket 5 has an elongated upper roller groove 7, the roller shaft of the upper clamping roller 3 is inserted into the upper roller groove 7 and rotatably connected to the upper roller groove 7, and the lower roller bracket 6 has an elongated lower roller groove 8, the roller shaft of the lower clamping roller 4 is inserted into the lower roller groove 8 and rotatably connected to the lower roller groove 8.

[0024] The connecting ends of the upper roller bracket 5 and the lower roller bracket 6 are both connected to the connecting ends of the tension belt 2, and the winding end of the tension belt 2 is wound around the tension roller 1.

[0025] Along the direction that moves further away from the connecting end of the upper roller bracket 5 and / or the connecting end of the lower roller bracket 6, the distance between the upper roller groove 7 and the lower roller groove 8 gradually decreases.

[0026] During implementation, with Figure 2For example, the end of the reinforcing bar 21 is placed between the upper clamping roller 3 and the lower clamping roller 4. The upper clamping roller 3 and the lower clamping roller 4 are in contact with the reinforcing bar 21, but do not yet have a clamping force on the reinforcing bar 21. At this time, the upper clamping roller 3 and the lower clamping roller 4 are close to the connecting end of the upper roller bracket 5 and the connecting end of the lower roller bracket 6. The tensioning roller 1 is rotated counterclockwise, which increases the length of the tensioning belt 2 wound on the tensioning roller 1. The upper roller bracket 5 and the lower roller bracket 6 move to the right under the drive of the tensioning belt 2. However, due to the friction between the upper clamping roller 3 and the lower clamping roller 4 and the reinforcing bar 21, they do not move synchronously with the upper roller bracket 5 and the lower roller bracket 6. Instead of moving to the right, the upper roller rotates counterclockwise and the lower roller rotates clockwise, moving to the left relative to the upper roller groove 7 and the lower roller groove 8. As the distance between the upper roller groove 7 and the lower roller groove 8 gradually decreases, the upper clamping roller 3 and the lower clamping roller 4 move closer to each other under the guidance of the upper roller groove 7 and the lower roller groove 8, and the distance gradually decreases, thereby achieving effective clamping of the reinforcing bar 21. After the reinforcing bar 21 is effectively clamped, the tensioning roller 1 continues to rotate counterclockwise, which increases the length of the tensioning belt 2 wound on the tensioning roller 1. Driven by the clamping roller group, the end of the reinforcing bar 21 moves closer to the tensioning roller 1, thereby achieving tensioning of the reinforcing bar 21.

[0027] Compared with the prior art, the tensioning device for the reinforcing bars provided in this embodiment allows engineers to fully tension the reinforcing bars 21 during the laying process, applying lateral prestress so that the reinforcing bars 21 are in a taut state in the early stage of filling. This effectively avoids the problem of passive tension caused by the relaxation of the reinforcing bars 21 in traditional construction methods. This active tensioning mechanism can significantly improve the initial stability of the tension-reinforced soil retaining wall. By pre-stressing the reinforcing bars by allowing them to undergo elastic strain, the overall ability of the structure to resist lateral deformation is enhanced.

[0028] In addition, the tensioning device of the above-mentioned reinforcement material, through the synergistic effect of mechanical clamping and roller transmission, can achieve precise control and dynamic adjustment of tension force during filling, providing a reliable technical guarantee for high-stability filling projects under narrow space conditions.

[0029] To improve the clamping stability of the upper clamping roller 3 and the lower clamping roller 4 on the reinforcing bar 21, a friction layer is provided on the outer wall of both the upper clamping roller 3 and the lower clamping roller 4. This friction layer significantly enhances the friction between the upper clamping roller 3 and the lower clamping roller 4 and the reinforcing bar 21, effectively preventing slippage or detachment of the reinforcing bar 21 during tensioning and ensuring the stability and reliability of the tensioning operation.

[0030] It is worth noting that after the reinforcing bar 21 is tensioned, it will have a rebound force due to elastic deformation. In order to ensure that it is always in a tensile state and does not rebound in the early stage of filling, the tensioning device of the reinforcing bar also includes a fixing plate for fixing two adjacent layers of reinforcing bar 21.

[0031] In a pair of adjacent reinforcing bars 21, the upper reinforcing bar 21 is defined as the upper layer reinforcing bar, and the lower reinforcing bar 21 is defined as the lower layer reinforcing bar. The fixing plate includes the plate body 9 and the connecting hook 10. See [link / reference]. Figure 3 The connecting hook 10 has an arc greater than or equal to 180° and a downward rotation angle of not less than 180°. A first through hole and a second through hole are provided on the plate 9. The end of the connecting hook 10 with the protrusion 11 is the protruding end, and the end of the connecting hook 10 without the protrusion 11 is the insertion end. The plate 9 is placed on the surface of the upper reinforcement. The insertion end of the connecting hook 10 passes through the first through hole, the upper reinforcement, and the horizontal section of the back-wrapped portion of the lower reinforcement in sequence, and then exits through the second through hole. The protruding end is engaged with the opening of the first through hole. For example, there are multiple connecting hooks 10, such as 5 to 8, evenly arranged along the length of the plate 9. In this way, through the cooperation of the connecting hooks 10 and the plate 9, the upper and lower reinforcements can be firmly connected together, effectively resisting the rebound force of the reinforcement 21, ensuring that the reinforcement 21 remains taut during the initial filling stage, significantly improving the overall stability of the tension-reinforced soil retaining wall, and ensuring the quality and safety of the project.

[0032] For example, the thickness of the plate 9 is not greater than 10 mm, for example, 6 mm to 8 mm, the height of the connecting hook 10 is not less than 20 mm, for example, 22 mm to 25 mm, and the thickness is not greater than 2 mm, for example, 1.5 mm to 1.8 mm.

[0033] To achieve synchronous movement of the upper roller support 5 and the lower roller support 6, and to simultaneously clamp the ends of the reinforcing bar 21 with the upper clamping roller 3 and the lower clamping roller 4, the tensioning device further includes a transition connector. This transition connector comprises a connecting bracket 12 and a connecting ring. One end of the connecting bracket 12 is fixedly connected to the connecting end of the upper roller support 5, and the other end of the connecting bracket 12 passes radially through the connecting ring and is fixedly connected to the connecting end of the lower roller support 6. For example, the upper roller support 5, the lower roller support 6, and the connecting bracket 12 are integrally formed, and the connecting end of the tensioning belt 2 is fixedly connected to the connecting ring. Thus, when the tensioning roller 1 rotates, the tensioning belt 2 drives the connecting ring to move. Since both ends of the connecting bracket 12 are fixedly connected to the upper roller support 5 and the lower roller support 6 respectively, and are linked through the connecting ring, the synchronous movement of the upper roller support 5 and the lower roller support 6, as well as the stability and reliability of the tensioning process, can be ensured.

[0034] To achieve a stable connection between the tensioning band 2 and the connecting bracket 12, the connecting ring structure includes a first half-ring 13 and a second half-ring 14, symmetrically arranged and detachably connected by pins. The tensioning band 2 is positioned between the first half-ring 13 and the second half-ring 14, and the connecting bracket 12 passes through the first half-ring 13, the tensioning band 2, and the second half-ring 14. Thus, during tensioning, the tensioning band 2 and the connecting bracket 12 are tightly connected through the connecting ring, forming a stable mechanical system. Because the first half-ring 13 and the second half-ring 14 of the connecting ring are detachably connected by pins, the structural integrity is maintained during tensioning, preventing the connecting ring from separating due to excessive tension.

[0035] It should be noted that, in order to achieve the connection between the fixing plate and the clamping roller assembly, the aforementioned transition connector also includes a first pull ring 15 and a second pull ring 16 that are interconnected. The first pull ring 15 is located on the side wall of the plate 9, and the second pull ring 16 is located between the first half-ring 13 and the second half-ring 14. The connecting bracket 12 passes through the second pull ring 16. Thus, after the tensioning operation of the reinforcing bar 21 is completed by the clamping roller assembly, the first pull ring 15 of the fixing plate can be connected to the second pull ring 16 on the transition connector. This connection method allows the fixing plate and the clamping roller assembly to form a detachable whole, facilitating the removal and recycling of the clamping roller assembly after construction, thereby reducing project costs.

[0036] Understandably, in order to achieve the connection of the tensioning roller 1, the aforementioned tensioning device for the reinforcing material also includes a mounting plate 17 and a mounting bracket 18. The mounting plate 17 is located on the outer side of the composite panel 20 of the reinforced soil retaining wall. One end of the mounting bracket 18 is fixedly connected to the mounting plate 17, and the other end is rotatably connected to the tensioning roller 1. In this way, the installation of the mounting plate 17 and the mounting bracket 18 ensures the stability and reliability of the tensioning roller 1 during rotation, thereby avoiding the impact of shaking or displacement on the tensioning effect.

[0037] For example, the mounting plate 17 is rectangular in shape, and the side length of the mounting plate 17 is not less than 150 mm, for example, 160 mm to 180 mm.

[0038] Example 2 This embodiment provides a tensioning device for reinforcing bars, the structure of which is basically the same as that of the tensioning device for reinforcing bars provided in Embodiment 1, the difference being: See Figure 4The tensioning device for the reinforcing bar in this embodiment also includes a stress display 19 and a resistance strain gauge. The resistance strain gauge is disposed on or inside the tensioning belt 2 and deforms synchronously with the tensioning belt 2. The stress display 19 is connected to the resistance strain gauge. In this way, the strain change of the tensioning belt 2 during the tensioning process can be sensed in real time by setting the resistance strain gauge. In practical applications, engineers only need to observe the value on the stress display 19 to accurately understand the current stress on the tensioning belt 2 and adjust the rotation speed of the tensioning roller 1 in a timely manner to ensure that the tension force is always kept within the design range, thereby achieving precise tensioning of the reinforcing bar 21.

[0039] It should be noted that, since the resistance value of the resistance strain gauge changes accordingly with the deformation of the tension belt 2, and this change is proportional to the stress borne by the tension belt 2, the stress display 19 receives and processes the electrical signal transmitted by the resistance strain gauge, converts it into an intuitive stress value and displays it.

[0040] For example, a rectangular groove is formed on the mounting plate 17, and the side length of the rectangular groove is not less than 20 mm, for example, 22 mm to 22 mm. The stress display 19 is installed in the rectangular groove and is located above the tensioning roller 1.

[0041] Example 3 This embodiment provides a method for laying a back-wrapped tension reinforcement layer, using the tensioning device for the reinforcement provided in Embodiment 1. The laying method includes the following steps: Step 1: Lay the lower layer of reinforcing bars and form a wrap-around structure at both ends of the lower layer of reinforcing bars; Step 2: Lay a foundation backfill layer between the upper surface of the lower reinforcement and the back-wrapping structure at both ends. The upper surface of the foundation backfill layer is lower than the upper surface of the back-wrapping structure to facilitate the subsequent tensioning of the upper reinforcement. For example, the height difference between the two is 4cm~5cm. Step 3: Lay the upper layer of reinforcing material; Step 4: Set up the tensioning device and place the end of the upper reinforcement between the upper clamping roller 3 and the lower clamping roller 4, with the upper clamping roller 3 and the lower clamping roller 4 in contact with the reinforcement 21. Step 5: Rotate the tensioning roller 1 to increase the length of the tensioning belt 2 wound on the tensioning roller 1. The upper roller support 5 and the lower roller support 6 move away from the center of the upper reinforcement under the drive of the tensioning belt 2. The upper clamping roller 3 and the lower clamping roller 4 move closer to each other to clamp the end of the upper reinforcement. Step 6: Continue to rotate the tensioning roller 1, so that the length of the tensioning strip 2 wound on the tensioning roller 1 increases. Driven by the clamping roller group, the end of the upper reinforcement moves towards the tensioning roller 1. The upper reinforcement is suspended above the foundation fill layer, and the tensioning of the upper reinforcement is completed. Step 7: After completing the tensioning of the upper layer of reinforcement, use the fixing plate to connect and fix the upper and lower layer of reinforcement, and remove the tensioning device of the reinforcement through the drainage hole of the composite panel 20.

[0042] Step 8: Between the upper reinforcement and the foundation fill layer, the surface fill layer is laid through the gaps of the upper reinforcement or directly compacted on top of the upper reinforcement. The surface fill layer and the foundation fill layer constitute the interlayer fill layer of the back-wrapped tie reinforcement layer.

[0043] Compared with the prior art, the method for laying the reinforcing layer of the back-wrapping tie layer provided in this embodiment has basically the same beneficial effects as the tensioning device of the reinforcing material provided in Embodiment 1, and will not be described in detail here.

[0044] Understandably, in order to ensure that the filling remains under tension during the initial stage and to prevent rebound, the following steps are included after step 8 above: Step 9: Insert the connecting hook 10 through the horizontal section of the wrapping structure of the first through hole, the upper reinforcement, and the lower reinforcement in sequence, and then through the second through hole. The protruding end is engaged with the opening of the first through hole, thus completing the connection between the upper reinforcement and the lower reinforcement.

[0045] This step utilizes the connecting effect of the fixing plate to firmly connect the upper and lower reinforcing bars together, effectively resisting the rebound force of the reinforcing bar 21 and ensuring that the reinforcing bar 21 remains taut during the initial filling stage, thereby significantly improving the overall stability of the tension-reinforced soil retaining wall.

[0046] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A tensioning device for reinforcing bars, used for tensioning reinforcing bars in reinforced soil retaining walls, characterized in that, Includes tensioning rollers, tensioning belts, and clamping roller assemblies for holding the ends of the reinforcing bars; The clamping roller assembly includes an upper clamping roller, a lower clamping roller, an upper roller bracket, and a lower roller bracket. The upper roller bracket has an elongated upper roller groove, and the roller shaft of the upper clamping roller is inserted into the upper roller groove and rotatably connected to the upper roller groove. The lower roller bracket has an elongated lower roller groove, and the roller shaft of the lower clamping roller is inserted into the lower roller groove and rotatably connected to the lower roller groove. Both the connecting ends of the upper roller bracket and the lower roller bracket are connected to the connecting end of the tensioning belt, and the winding end of the tensioning belt is wound around the tensioning roller.

2. The tensioning device for reinforcing bars according to claim 1, characterized in that, The distance between the upper roller groove and the lower roller groove gradually decreases along the direction that moves away from the connecting end of the upper roller bracket and / or the connecting end of the lower roller bracket.

3. The tensioning device for reinforcing bars according to claim 1, characterized in that, The outer walls of both the upper and lower clamping rollers are provided with friction layers.

4. The tensioning device for reinforcing bars according to claim 1, characterized in that, The tensioning device also includes a fixing plate for fixing two adjacent layers of reinforcing bars.

5. The tensioning device for reinforcing bars according to claim 1, characterized in that, The tensioning device further includes a transition connector, which includes a connecting bracket and a connecting ring. One end of the connecting bracket is fixedly connected to the connecting end of the upper roller bracket, and the other end of the connecting bracket passes through the connecting ring radially and is fixedly connected to the connecting end of the lower roller bracket. The connecting end of the tensioning belt is fixedly connected to the connecting ring.

6. The tensioning device for reinforcing bars according to claim 5, characterized in that, The upper roller bracket, lower roller bracket, and connecting bracket are formed as a single unit.

7. The tensioning device for reinforcing bars according to claim 1, characterized in that, The tensioning device also includes a mounting plate and a mounting bracket; The mounting plate is located on the outside of the composite panel of the reinforced soil retaining wall; One end of the mounting bracket is fixedly connected to the mounting plate, and the other end is rotatably connected to the tensioning roller.

8. The tensioning device for reinforcing bars according to claim 1, characterized in that, The tensioning device also includes a stress display and a resistive strain gauge. The resistive strain gauge is disposed on or inside the tensioning belt and deforms synchronously with the tensioning belt. The stress display is connected to the resistive strain gauge.

9. A method for laying a back-wrapped tie-reinforced layer, characterized in that, The laying method, employing the tensioning device for reinforcing bars as described in any one of claims 1 to 8, comprises the following steps: Step 1: Lay the lower layer of reinforcing bars and form a wrap-around structure at both ends of the lower layer of reinforcing bars; Step 2: Lay a foundation fill layer between the upper surface of the lower reinforcement and the back-wrap structure at both ends, with the upper surface of the foundation fill layer lower than the upper surface of the back-wrap structure; Step 3: Lay the upper layer of reinforcing material; Step 4: Set up the tensioning device and place the end of the upper layer reinforcement between the upper clamping roller and the lower clamping roller, wherein the upper clamping roller and the lower clamping roller are in contact with the reinforcement. Step 5: Rotate the tensioning roller to increase the length of the tensioning belt wound on the tensioning roller. The upper roller support and the lower roller support move away from the center of the upper reinforcement under the drive of the tensioning belt. The upper clamping roller and the lower clamping roller move closer to each other to clamp the end of the upper reinforcement. Step 6: Continue to rotate the tensioning roller to increase the length of the tensioning strip wound on the tensioning roller. Driven by the clamping roller group, the end of the upper reinforcement moves towards the tensioning roller. The upper reinforcement is suspended above the foundation fill layer, completing the tensioning of the upper reinforcement. Step 7: After completing the tensioning of the upper layer of reinforcement, use a fixing plate to connect and fix the upper layer of reinforcement to the lower layer of reinforcement, and remove the tensioning device of the reinforcement through the drainage holes of the composite panel. Step 8: Between the upper reinforcement and the foundation fill layer, the surface fill layer is laid through the gaps of the upper reinforcement or directly compacted on top of the upper reinforcement. The surface fill layer and the foundation fill layer constitute the interlayer fill layer of the back-wrapped tie reinforcement layer.

10. The method for laying the back-wrapped tie-reinforced layer according to claim 9, characterized in that, In step 2, the height difference between the upper surface of the foundation fill layer and the upper surface of the backfill structure is 4 cm to 5 cm.

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