Reflection crack preventing structure at expansion joint of white-to-black pavement

Abstract

The utility model relates to a structure for preventing a reflection crack at a white-to-black pavement expansion joint, which is characterized in that a slope for guiding the expansion joint is arranged at the top of a cement concrete pavement slab, the cement concrete pavement slabs are connected through a dowel bar, a joint filling material is poured into the expansion joint, and a steel cover plate is arranged above the expansion joint; and the bottom of the steel cover plate is matched with the cement concrete pavement slab in shape. And the anti-crack patch covers the upper parts of the steel cover plate and the cement concrete pavement. The anti-reflection crack structure at the expansion joint of the white-to-black pavement can enhance the tensile property of the bottom of an asphalt surface layer under the conditions of temperature and vehicle load; the use function of the expansion joint is prevented from being influenced by broken stone clamping caused by expansion joint expansion; the vertical displacement change of the steel plate caused by transverse expansion of the expansion joint can be greatly reduced, and the influence on an asphalt concrete surface layer is reduced.

Description

Technical Field

[0001] The present application relates to a structure for preventing reflective cracks at expansion joints of a white-to-black road surface, and belongs to the technical field of reinforcement of existing building structures. Background Art

[0002] In the process of converting white roads to black roads, reflective cracks are one of the main forms of cracks in the asphalt concrete surface layer. Reflective cracks provide a channel for moisture to enter the internal structure of the road, which will affect the strength and stability of the roadbed. More importantly, under the influence of vehicle loads and temperature loads, cracks will quickly expand to the surrounding areas, greatly shortening the service life of the overlay layer.

[0003] There are three main methods to mitigate reflective cracks: improving the performance of the asphalt overlay, setting a crack-blocking interlayer between the asphalt overlay and the old cement concrete pavement, and graveling the old pavement.

[0004] Expansion joints are set at the cement concrete pavement near bridges or other fixed structures, or at the intersection with other roads. The width is generally 20-25mm, and a caulking plate and a slidable force transmission rod are set in the joint. Its main purpose is to provide space for the expansion of the concrete slab. At present, the anti-reflective crack treatment at the expansion joint is mainly through the first two methods, especially the setting of crack-blocking interlayers, such as anti-crack stickers, geotextiles, and stress absorption layers. However, there are several problems:

[0005] If crack-resistant interlayers such as anti-crack stickers, geotextiles, and crushed stone stress absorption layers are used, these materials directly above the expansion joint will fall down as the expansion joint contracts due to their inherent flexibility. And because the expansion joint is wide, even with a crack-resistant interlayer between them, crushed stone can still be easily embedded in it.

[0006] If a covering member is provided on the upper part of the expansion joint, the current non-transversely telescopic rigid covering member will be lifted up due to the contraction of the expansion joint, and gravel will be easily embedded in the bottom, making it impossible to fall back; the transversely telescopic rigid covering member will be easily stuck in the joint by gravel due to the existence of telescopic channels on the surface, making it impossible to expand and contract; and the flexible covering member will be easily embedded in the expansion joint by gravel.

[0007] 3. The paving temperature of asphalt mixture is generally not lower than 125℃~140℃, and ordinary crack-blocking or seam-covering materials cannot withstand high temperatures.

[0008] Therefore, in order to solve the above technical problems, it is necessary to provide a structure for preventing reflective cracks at expansion joints of white-to-black pavement to overcome the above defects in the prior art. Utility Model Content

[0009] The utility model aims to provide a structure for preventing reflective cracks at expansion joints of white-to-black road surfaces which can prevent reflective cracks.

[0010] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: it includes a cement concrete road panel and an asphalt surface layer, the cement concrete road panel is provided with an expansion joint, the top of the cement concrete road panel is provided with a slope surface for guiding the expansion joint, a filler is provided in the expansion joint, the cement concrete road panels are connected by force transmission rods, a steel cover plate is provided above the expansion joint, and the bottom of the steel cover plate is adapted to the shape of the cement concrete road panel.

[0011] By adopting the above technical solution, the steel cover can greatly reduce the impact on the asphalt surface layer during the lifting process of the steel cover, and the setting of the steel cover can prevent gravel from entering the expansion joint from the front.

[0012] The utility model provides a structure for preventing reflective cracks at expansion joints of a white-to-black road surface, which is further configured to include an anti-cracking sticker which covers the steel cover plate.

[0013] By adopting the above technical solution, the anti-crack sticker is set on the steel cover plate and adhered to the water concrete panels on both sides, so that no matter what the expansion joint expansion state is, it will be in a tension state. At the same time, the setting of the anti-crack sticker can prevent gravel from entering the expansion joint from the side.

[0014] The structure for preventing reflective cracks at expansion joints of a white-to-black road surface of the utility model is further configured such that the ratio of the vertical height to the horizontal length of the slope surface is 1:20 to 1:8.

[0015] By adopting the above technical solution, even if the expansion joint is completely closed, it will only cause a maximum vertical displacement of 1.57mm.

[0016] By adopting the above technical solution, the setting of the steel cover plate and the anti-cracking sticker covering can prevent the gravel from entering the expansion joint from the front and getting stuck in the steel cover plate from the side.

[0017] The structure for preventing reflective cracks at expansion joints of a white-to-black road surface of the utility model is further arranged such that the ratio of the vertical height to the horizontal length of the slope surface is 1:10.

[0018] By adopting the above technical solution, even if the expansion joint is completely closed, it will only cause a maximum vertical displacement of 1.25 mm.

[0019] The utility model provides a structure for preventing reflective cracks at expansion joints of a white-to-black road surface, which is further configured as follows: the joint filling material is asphalt.

[0020] The utility model provides a structure for preventing reflective cracks at expansion joints of a white-to-black road surface, which is further configured as follows: the surface of the steel cover plate is flush with the cement concrete road surface plate.

[0021] By adopting the above technical solution, the smoothness of the asphalt surface layer can be maintained.

[0022] The structure of the anti-reflective crack at the expansion joint of a white-to-black road surface of the utility model is further set as follows: the length of the steel cover plate extending from both sides of the anti-cracking sticker is 15cm to 20cm. The structure of the anti-reflective crack at the expansion joint of a white-to-black road surface of the utility model is further set as follows: the length of the steel cover plate extending from both sides of the anti-cracking sticker is 15cm to 20cm.

[0023] The utility model provides a structure for preventing reflective cracks at expansion joints of a white-to-black road surface, which is further configured as follows: the cross section of the steel cover plate is triangular.

[0024] Compared with the prior art, the utility model has the following beneficial effects:

[0025] 1. The anti-cracking sticker in the utility model is arranged on the steel cover plate and is pasted to the water concrete panels on both sides, so that no matter what the expansion joint expansion and contraction state is, it will be in a tensioned state.

[0026] 2. The arrangement of the steel cover plate covered with anti-cracking stickers in the utility model can prevent the crushed stones from entering the expansion joint from the front and getting stuck in the steel cover plate from the side.

[0027] 3. The setting of the steel cover plate and the anti-cracking sticker covering in the utility model can greatly reduce the impact of the steel cover plate on the asphalt surface layer during the lifting process.

[0028] 4. The slope of the slope in the utility model will only cause a maximum vertical displacement of 1.57 mm even if the expansion joint is completely closed. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the structure for preventing reflective cracks at expansion joints of white-to-black pavement.

[0030] Figure 2 It is a schematic diagram of cement concrete road slab and dowel bar;

[0031] Figure 3 This is a schematic diagram of the steel cover.

[0032] Explanation of numbers: expansion joint 1, cement concrete road panel 2, force transfer rod 3, filler 4, steel cover plate 5, anti-cracking sticker 6, asphalt surface layer 7. DETAILED DESCRIPTION

[0033] Please refer to the instruction manual Figure 1 To Attachment Figure 3 As shown, the utility model is a structure for preventing reflective cracks at an expansion joint 1 of a white-to-black road surface, comprising a cement concrete road panel 2, the cement concrete road panel 2 having an expansion joint 1 on the road panel, an asphalt surface layer 7 located above the cement concrete road panel 2, the cement concrete road panels 2 being connected by a force transfer rod 3, the force transfer rod 3 being slidably connected in the cement concrete road panel 2, a filler 4 being poured inside the expansion joint 1, and as a preferred embodiment, the filler 4 is made of asphalt to reduce the cost of filling.

[0034] A slope for guiding the expansion joint 1 is provided on the top of the cement concrete road panel 2. A steel cover plate 5 is provided above the expansion joint 1. The bottom of the steel cover plate 5 is adapted to the shape of the cement concrete road panel 2. The vertical height of the slope is c, the horizontal length of the slope is a, and the horizontal length of the expansion joint 1 is b. The ratio of the vertical height to the horizontal length of the slope is 1:20 to 1:8. As a preferred embodiment, the ratio of the vertical height to the horizontal length of the slope is 1:10. The cross section of the steel cover plate 5 is triangular. The setting of the steel cover plate 5 can prevent the gravel from entering the expansion joint 1 from the front. The steel cover plate 5 can greatly reduce the impact of the steel cover plate 5 on the asphalt surface layer 7 during the lifting process. If the slope is 1:10, even if the expansion joint 1 is completely closed, it will only cause a maximum vertical displacement of 1.25 mm. The surface of the steel cover plate 5 is flush with the cement concrete road panel 2 to maintain the stability of the asphalt surface layer 7.

[0035] The anti-crack sticker 6 covers the steel cover plate 5, and the length of the two sides of the anti-crack sticker 6 extending out of the steel cover plate 5 is 15 cm to 20 cm. As a preferred embodiment, the length of the two sides of the anti-crack sticker 6 extending out of the steel cover plate 5 is 15 cm. The anti-crack sticker 6 is set on the steel cover plate 5 and adhered to the cement concrete road panel 2. No matter what the expansion joint 1 is in the expansion and contraction state, it will be in a tensioned state, and the anti-crack sticker 6 covering setting can prevent the gravel side from getting stuck in the steel cover plate 5.

[0036] The principle of the anti-reflective crack structure at the expansion joint of the white-to-black road surface of the utility model is as follows:

[0037] When the expansion joint 1 needs to be treated to prevent reflective cracks, first remove the filler inside the expansion joint 1 and the debris that falls into the joint, use the bending and sinking method to investigate the hollowing condition of the bottom of the cement concrete road panel 2 on both sides of the expansion joint 1. If it is hollowing, it is necessary to use grouting to treat it. Secondly, use the bending and sinking method to investigate the force transmission performance of the cement concrete road panel 2 on both sides of the expansion joint. If it does not meet the standard, the position of the force transmission rod 3 needs to be reset until it meets the standard requirements, and then the cement concrete road panel 2 on both sides of the expansion joint is processed into a slope surface, and the slope c:a=1:10; the filler 4 poured into the expansion joint 1 is asphalt, and the surface of the steel cover plate 5 and the slope surface of the cement concrete road panel 2 are covered with asphalt, and then the steel cover plate 5 is placed on the expansion joint 1. The surface of the steel cover plate 5 needs to be flush with the cement concrete road panel 2, and the anti-cracking sticker 6 is installed. The anti-cracking sticker 6 extends 15cm on each side of the steel cover plate. Add asphalt surface layer 7 according to the design plan.

[0038] The above specific implementation methods are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A structure for preventing reflective cracks at expansion joints of a white-to-black road surface, comprising a cement concrete road slab and an asphalt surface layer, wherein the cement concrete road slab has expansion joints, and is characterized in that: A slope surface for guiding expansion joints is provided on the top of the cement concrete road slab, a filler is provided in the expansion joint, the cement concrete road slabs are connected by force transmission rods, a steel cover plate is provided above the expansion joint, and the bottom of the steel cover plate is adapted to the shape of the cement concrete road slab.

2. The structure for preventing reflective cracks at expansion joints of white-to-black pavement according to claim 1 is characterized in that: It also includes anti-cracking stickers, which cover the steel cover.

3. The structure for preventing reflective cracks at expansion joints of white-to-black pavement according to claim 1 is characterized in that: The ratio of the vertical height to the horizontal length of the slope is 1:20 to 1:

8.

4. The structure for preventing reflective cracks at expansion joints of white-to-black road surfaces according to claim 3 is characterized in that: The ratio of the vertical height to the horizontal length of the slope is 1:

10.

5. The structure for preventing reflective cracks at expansion joints of white-to-black road surfaces according to claim 1 is characterized in that: The caulking material is asphalt.

6. The structure for preventing reflective cracks at expansion joints of white-to-black road surfaces according to claim 1 is characterized in that: The surface of the steel cover is flush with the cement concrete road slab.

7. The structure for preventing reflective cracks at expansion joints of white-to-black road surfaces according to claim 2 is characterized in that: The length of the anti-cracking stickers extending out of the steel cover plate on both sides is 15 cm to 20 cm.

8. The structure for preventing reflective cracks at expansion joints of white-to-black road surfaces according to claim 7 is characterized in that: The length of the anti-cracking stickers extending out of the steel cover plate on both sides is 15 cm.

9. The structure for preventing reflective cracks at expansion joints of white-to-black road surfaces according to claim 1, characterized in that: The cross section of the steel cover is triangular.

Images