A splicable roadbed structure

Abstract

The utility model discloses a kind of splicing type roadbed structures, it is related to roadbed construction technical field, including old roadbed and widened roadbed, and multiple reinforcing steels crossing widened roadbed are embedded in widened roadbed;One end of reinforcing steel is fixed on inlay board, and the other end is fixed on tensioning device;Inlay board is fixed on old roadbed;Tensioning device includes fixed frame, sliding frame slidingly installed on fixed frame and sliding drive device for driving sliding frame to slide;Fixed frame is located at one side of widened roadbed and is fixed on ground, and sliding frame is located at the side of fixed frame away from widened roadbed;Reinforcing steel is fixed on sliding frame;Sliding drive device is fixed between fixed frame and sliding frame, and drives sliding frame to slide away from fixed frame direction.In the pouring widened roadbed before reinforcing steel is applied tension, the connecting strength between new and old roadbed is enhanced, effectively reduce the probability and speed that longitudinal joint of widened road surface is formed, improve the load capacity and durability of road surface.

Description

Technical Field

[0001] This utility model relates to the field of roadbed construction technology, and in particular to a splicable roadbed structure. Background Technology

[0002] With the rapid development of road construction, the widening and reconstruction of old roads is becoming increasingly common. However, the uneven settlement of the old and new roadbeds makes it difficult to completely solve the problem of longitudinal joints at the joints, especially for old cement concrete pavements, where the splicing is even more difficult. The current "Highway Subgrade Design Specification" adopts a method of open-cut treatment combined with geogrid paving. This method has many shortcomings. It is not suitable for the connection of cement concrete pavements, the connection strength between the old and new pavement structures is poor, and it cannot effectively reduce the probability and speed of longitudinal joint formation after widening. As the cracks continue to expand, the load-bearing capacity and durability of the pavement will be severely adversely affected. Utility Model Content

[0003] The purpose of this invention is to provide a splicable roadbed structure that applies tension to the reinforcing steel before pouring the widened roadbed, thereby enhancing the connection strength between the old and new roadbeds, effectively reducing the probability and speed of longitudinal joint formation in the widened road surface, and improving the load-bearing capacity and durability of the road surface.

[0004] To achieve the above objectives, this utility model provides a splicable roadbed structure, including an old roadbed and a widened roadbed disposed on at least one side of the old roadbed and spliced ​​with it. Multiple reinforcing bars are embedded within the widened roadbed, arranged parallel to each other with their length direction perpendicular to the extension direction of the old roadbed. One end of each reinforcing bar is fixed to an inner plate, and the other end is fixed to a tensioning device. The inner plate is fixed to the old roadbed. The tensioning device includes a fixed frame, a sliding frame slidably mounted on the fixed frame, and a sliding drive device for driving the sliding frame to slide. The fixed frame is located on one side of the widened roadbed and fixed to the ground, while the sliding frame is located on the side of the fixed frame away from the widened roadbed. The reinforcing bars are fixed to the sliding frame. The sliding drive device is fixed between the fixed frame and the sliding frame and drives the sliding frame to slide away from the fixed frame.

[0005] With the above structure, before pouring, the inner plate is fixed to the old roadbed, one end of the steel bar is fixed to the inner plate, and the other end is fixed to the sliding frame. Then, the sliding frame is driven to slide by the sliding drive device, thereby applying tension to the steel bar, so that the steel bar is in a tensile state before pouring the widened roadbed. After the pouring is completed and dried and solidified, the steel bar is cut, thereby releasing the tension. The pre-stressing counteracts the tensile stress generated by the external load, enhances the connection strength between the new and old roadbeds, effectively reduces the probability and speed of crack formation, and improves the load-bearing capacity and durability of the pavement.

[0006] Preferably, the side where the old roadbed and the widened roadbed intersect is designated as the splicing side, and this splicing side is designed with a stepped structure. The side where the widened roadbed and the old roadbed intersect also features an inverted stepped structure adapted to the stepped structure. The fixed ends of the reinforcing bars are fixed to the uppermost stepped structure. This stepped splicing increases the contact surface and improves shear resistance.

[0007] Preferably, the stepped structure is roughened. Roughening enhances adhesion, reduces interlayer slippage, and increases friction at the joint surface between the old and new roadbeds, thereby improving connection strength.

[0008] Preferably, the stepped structure includes a horizontally arranged stepped surface and a connecting surface connecting the upper stepped surface. The connecting surface is inclined, with its inclination direction from the old roadbed direction downwards towards the widened roadbed direction. This inclined connecting surface design can better guide the bonding of the widened roadbed casting material with the old roadbed, further improving the splicing quality. The inclined connecting surface helps stress diffusion and reduces stress concentration.

[0009] Preferably, the connecting surface of the uppermost step structure has an recessed groove that curves inward toward the old roadbed; the recessed plate is fixed in the recessed groove by anchor bolts. This design enhances the connection stability between the recessed plate and the old roadbed, thereby better securing the reinforcing steel.

[0010] Preferably, multiple fixed supports are evenly fixed along the extension direction on one side of the widened roadbed, and the fixing frame abuts against the side of the fixed supports away from the widened roadbed. This structure enhances the stability of the fixing frame and ensures that the tensioning device can function properly.

[0011] Preferably, the bottom of the sliding frame is fixed with a track parallel to the reinforcing bar; rollers that slide along the track are also fixedly installed at the bottom of the sliding frame. This design reduces friction during sliding, allowing the sliding frame to slide more smoothly and ensuring stable application of the reinforcing bar tension.

[0012] Preferably, an isolation sleeve is fitted onto one end of the reinforcing bar located within the inner plate, with adjacent reinforcing bars having different sleeve lengths; a spiral reinforcement is fitted onto the reinforcing bar, located at the end of the isolation sleeve furthest from the inner plate. The different sleeve lengths disperse the tensile stress at the fixed end of the roadbed during prestressing retraction after the roadbed is completed; when the concrete encases the spiral reinforcement, the tensile stress at the concrete end is relatively high, making it prone to cracking. The spiral reinforcement provides crack resistance.

[0013] Preferably, a sliding rod is fixed on the sliding frame, one end of the sliding rod passes through the fixed frame and is detachably connected to the reinforcing bar, and the other end is fixedly connected to the sliding frame.

[0014] Preferably, the fixing frame has a through hole, and the sliding rod is slidably installed in the through hole. An anti-retraction structure is fixedly installed on one side of the through hole. This anti-retraction structure controls the sliding rod to be tensioned in only one direction, preventing retraction. The anti-retraction structure ensures that the reinforcing steel will not retract due to external factors after tension is applied, guaranteeing the continuous stability of the tension and effectively maintaining the connection strength between the old and new roadbeds. The anti-retraction structure can be referenced from the anchor bolt locking structure.

[0015] After adopting the above technical solution, the beneficial effects of this utility model are: This utility model provides a splicable roadbed structure that solves the technical problem in the prior art where the connection strength between the old and new concrete spliced ​​roadbeds is poor, affecting the load-bearing capacity and durability of the road surface. This utility model applies tension to the steel bars before pouring the widened roadbed, enhancing the connection strength between the old and new roadbeds, effectively reducing the probability and speed of longitudinal joint formation in the widened road surface, and improving the load-bearing capacity and durability of the road surface. Attached Figure Description

[0016] Figure 1 This is an installation diagram of a splicable roadbed structure according to the present invention; Figure 2 This is an isometric schematic diagram of a splicable roadbed structure according to the present invention; Figure 3 This is a top view of a splicable roadbed structure according to this utility model; Figure 4 This is a partially enlarged view of the tensioning device of this utility model; Figure 5 This is a schematic diagram of the structure of the present invention for installing the isolation sleeve and spiral reinforcement; Figure 6 yes Figure 5 A magnified view of part A in the image.

[0017] In the diagram, 1 is the old roadbed, 11 is the embedded groove, 2 is the widened roadbed, 3 is the reinforcing bar, 41 is the embedded plate, 411 is the anchor bolt, 42 is the tensioning device, 421 is the fixing frame, 422 is the sliding frame, 423 is the sliding drive device, 424 is the sliding rod, 425 is the track, 426 is the roller, 43 is the fixed pier, 44 is the isolation sleeve, 45 is the spiral reinforcement, and 46 is the anti-retraction structure. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings.

[0019] The orientations mentioned in this specification are based on the orientation of the modular roadbed structure of this utility model when it is working normally, and do not limit its orientation during storage and transportation. They only represent relative positional relationships and do not represent absolute positional relationships.

[0020] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, a splicable roadbed structure includes an existing roadbed 1 and a widened roadbed 2 disposed on at least one side of the existing roadbed 1 and spliced ​​with it. Multiple reinforcing bars 3 are embedded within the widened roadbed 2, spanning across it. The reinforcing bars 3 are arranged parallel to each other, with their length direction perpendicular to the extension direction of the existing roadbed 1. One end of each reinforcing bar 3 is fixed to an inner plate 41, and the other end is fixed to a tensioning device 42. The inner plate 41 is fixed to the existing roadbed 1.

[0021] Specifically, the side where the old roadbed 1 and the widened roadbed 2 intersect is called the splicing side, and the splicing side is designed with a stepped structure; the side where the widened roadbed 2 intersects with the old roadbed 1 is provided with an inverted stepped structure adapted to the stepped structure; the fixed ends of the reinforcing bars 3 are fixed to the uppermost stepped structure. The stepped structure is roughened to increase the friction between the new and old roadbed splicing surfaces and improve the connection strength. The stepped splicing increases the contact surface and improves shear resistance; the roughening treatment enhances adhesion and reduces interlayer slippage.

[0022] The stepped structure includes horizontally arranged stepped surfaces and connecting surfaces that connect to the upper stepped surfaces. The connecting surfaces are inclined, with the inclination direction from the old roadbed 1 downwards towards the widened roadbed 2. This inclined connecting surface design can better guide the casting material of the widened roadbed 2 to bond with the old roadbed 1, further improving the splicing quality. The inclined connecting surface helps stress diffusion and reduces stress concentration.

[0023] Furthermore, the uppermost step structure has an inset groove 11 recessed into the old roadbed 1 on its connecting surface; the inset plate 41 is fixed in the inset groove 11 by anchor rods 411. This design can enhance the connection stability between the inset plate 41 and the old roadbed 1, thereby better fixing the reinforcing steel 3.

[0024] The tensioning device 42 includes a fixed frame 421, a sliding frame 422 slidably mounted on the fixed frame 421, and a sliding drive device 423 for driving the sliding frame 422 to slide. The fixed frame 421 is located on one side of the widened roadbed 2 and fixed to the ground. Specifically, multiple fixed blocks 43 are evenly fixed along the extension direction on one side of the widened roadbed 2, and the fixed blocks 43 are fixed to the ground by ground anchors. The fixed frame 421 abuts against the side of the fixed blocks 43 away from the widened roadbed 2 to enhance the stability of the fixed frame 421 and ensure that the tensioning device 42 can work normally.

[0025] The sliding frame 422 is located on the side of the fixed frame 421 away from the widened roadbed 2; the reinforcing bars 3 are fixed on the sliding frame 422; the sliding drive device 423 is fixed between the fixed frame 421 and the sliding frame 422, and drives the sliding frame 422 to slide away from the fixed frame 421. Multiple sliding frames 422 can be slidably installed on one fixed frame 421, and each sliding frame 422 is driven to slide by multiple sliding drive devices 423; in this embodiment, three sliding frames 422 are slidably installed on one fixed frame 421, and each sliding frame 422 is driven to slide by two sliding drive devices 423, thereby ensuring tensile stability. Multiple adjacent reinforcing bars 3 can be fixed on the same sliding frame 422; in this embodiment, four reinforcing bars 3 are fixed on the same sliding frame 422. In this embodiment, the sliding drive device 423 is a hydraulic cylinder. A hydraulic system and control system are required on the construction site to ensure the normal synchronous operation of the hydraulic cylinder. In practical applications, other lifting structures can also be used.

[0026] The sliding frame 422 is driven to slide by the sliding drive device 423, which applies tension to the steel bar 3, so that the steel bar 3 is in a taut state before the widened roadbed 2 is poured, thereby enhancing the connection strength between the old and new roadbeds 1.

[0027] The bottom of the sliding frame 422 is fixed with a track 425 that is parallel to the reinforcing bar 3; the bottom of the sliding frame 422 is fixed with a roller 426 that slides along the track 425. This design can reduce the friction when the sliding frame 422 slides, so that the sliding frame 422 can slide more smoothly and ensure the stable application of tension of the reinforcing bar 3.

[0028] After the pouring is completed and the concrete has dried and solidified, the steel bar 3 needs to be cut from the side of the fixing frame 421 near the widened roadbed 2 to release the tension. However, this operation will result in the waste of the steel bar 3. In order to avoid waste, further improvements are made to the above structure.

[0029] A sliding rod 424 is fixed on the sliding frame 422. One end of the sliding rod 424 passes through the fixed frame 421 and is detachably connected to the reinforcing bar 3, while the other end is fixedly connected to the sliding frame 422. This design avoids the waste of the reinforcing bar 3, and only requires locking the reinforcing bar 3 to one end of the sliding rod 424 with a buckle, thus facilitating disassembly.

[0030] like Figure 5 and Figure 6As shown, an isolation sleeve 44 is fitted onto one end of the inner plate 41 on the reinforcing bar 3, and the lengths of the isolation sleeves 44 on adjacent reinforcing bars 3 are different. The isolation sleeve 44 is a PVC plastic pipe. By setting the isolation sleeve 44, when concrete is poured, the concrete and the reinforcing bar 3 are isolated, rendering the isolated section ineffective. The different lengths of the isolation sleeves 44 disperse the tensile stress at the fixed end of the subgrade during prestressing shrinkage after the subgrade is completed. A spiral reinforcement 45 is fitted onto the reinforcing bar 3, and the spiral reinforcement 45 is located at the end of the isolation sleeve 44 away from the inner plate 41. When the concrete wraps around the spiral reinforcement 45, the tensile stress at the end of the concrete is relatively large, making it prone to cracking. The spiral reinforcement 45 plays a role in crack resistance.

[0031] Furthermore, a through hole is provided on the fixing frame 421, and the sliding rod 424 is slidably installed in the through hole. An anti-retraction structure 46 is fixedly installed on one side of the through hole. The anti-retraction structure 46 controls the sliding rod 424 to be tensioned in only one direction, preventing retraction. The anti-retraction structure 46 can ensure that the reinforcing bar 3 will not retract due to external factors after tension is applied, ensuring the continuous stability of tension, thereby effectively maintaining the connection strength between the old and new roadbeds 1. The anti-retraction structure 46 can refer to the anchor bolt locking structure.

[0032] This invention enhances the connection strength between the old and new roadbeds by embedding steel bars 3 inside the widened roadbed 2 and applying tension to the steel bars 3 before pouring, thereby offsetting the tensile stress generated by external loads through pre-compression stress, effectively reducing the probability and speed of crack formation, and improving the load-bearing capacity and durability of the road surface.

[0033] Of course, the above description is not intended to limit the present utility model, and the present utility model is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model should also fall within the protection scope of the present utility model.

Claims

1. A splicable roadbed structure, comprising an existing roadbed and a widened roadbed disposed on at least one side of the existing roadbed and spliced ​​with the existing roadbed, characterized in that: The widened roadbed is embedded with multiple reinforcing bars that cross the widened roadbed. The multiple reinforcing bars are arranged in parallel and their length direction is perpendicular to the extension direction of the old roadbed. One end of the reinforcing bar is fixed to the embedded plate, and the other end is fixed to the tensioning device. The insert plate is fixed to the old roadbed; The tensioning device includes a fixed frame, a sliding frame slidably mounted on the fixed frame, and a sliding drive device for driving the sliding frame to slide. The fixed frame is located on one side of the widened roadbed and fixed to the ground, and the sliding frame is located on the side of the fixed frame away from the widened roadbed; the reinforcing bar is fixed on the sliding frame; the sliding drive device is fixed between the fixed frame and the sliding frame and drives the sliding frame to slide away from the fixed frame.

2. The modular roadbed structure according to claim 1, characterized in that: The side where the old roadbed and the widened roadbed are spliced ​​together is called the splicing side, and the splicing side is set as a stepped structure; the side where the widened roadbed and the old roadbed are spliced ​​together is provided with an inverted stepped structure adapted to the stepped structure; the fixed end of the steel bar is fixed on the uppermost stepped structure.

3. The modular roadbed structure according to claim 2, characterized in that: The stepped structure is roughened.

4. The modular roadbed structure according to claim 2, characterized in that: The step structure includes a horizontally arranged step surface and a connecting surface connecting the upper step surface. The connecting surface is inclined, with its inclination direction from the old roadbed direction downwards towards the widened roadbed direction.

5. A modular roadbed structure according to claim 4, characterized in that: The uppermost stepped structure has an embedded groove recessed into the old roadbed on its connecting surface; the embedded plate is fixed in the embedded groove by anchor rods.

6. The modular roadbed structure according to claim 1, characterized in that: Multiple fixed piers are evenly fixed along the extension direction on one side of the widened roadbed, and the fixing frame abuts against the fixed pier on the side away from the widened roadbed.

7. The modular roadbed structure according to claim 1, characterized in that: The bottom of the sliding frame is fixed with a track parallel to the reinforcing bar; the bottom of the sliding frame is fixed with rollers that slide along the track.

8. The modular roadbed structure according to claim 1, characterized in that: An isolation sleeve is fitted on one end of the inner plate of the steel bar, and the lengths of the isolation sleeves on adjacent steel bars are different. The reinforcing bar is fitted with a spiral bar, which is located at the end of the isolation sleeve away from the inner plate.

9. A modular roadbed structure according to claim 1, characterized in that: A sliding rod is fixed on the sliding frame. One end of the sliding rod passes through the fixed frame and is detachably connected to the reinforcing bar, while the other end is fixedly connected to the sliding frame.

10. A modular roadbed structure according to claim 9, characterized in that: The fixing frame has a through hole, and the slide rod is slidably installed in the through hole. An anti-retraction structure is fixedly installed on one side of the through hole. The anti-retraction structure controls the slide rod to be tensioned in only one direction to avoid retraction.

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