Asphalt concrete pavement with embedded part device arranged at corner damage position
By setting up arc-shaped embedded parts with spokes at the turn of mountain roads, the disease problems arising from heavy loads on asphalt concrete pavement are solved, and the shear strength and service life of the pavement are improved.
Patent Information
- Application Number
- CN202421322017.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-11
- Publication Date
- 2025-03-04
- Estimated Expiration
- 2034-06-11
AI Technical Summary
The asphalt concrete pavement at the turn of the mountainous road is prone to ruts, waves and large-area cracks due to the load of heavy-loaded vehicles, which affects the driving quality and safety of the road. The application of the existing technology in mountainous road projects is limited.
Arc embedded parts are arranged at the turn, and spokes are provided at intervals of the arc embedded parts. By fixing the arc embedded parts on the base layer and placing them in the asphalt layer, the integrity of the road surface is enhanced, forming a reinforced concrete structure similar to that of the arc embedded parts, and improving the shear strength.
It effectively prevents the displacement of asphalt pavement at the turn, improves the shear strength, reduces the shear damage to the road by heavy-duty vehicles, and extends the normal service life of the road.
Smart Images
Figure CN222557366U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of road engineering, in particular to an asphalt concrete pavement provided with embedded parts at defective places at turning places. Background Art
[0002] Roads in mountainous areas are generally relatively narrow, and the defects at lane turns are diverse. When heavy-loaded vehicles frequently travel on roads with a small turning radius, it is easy to cause rutting and waves on the asphalt pavement, which will affect the driving quality and safety of the road. After the defect occurs, rainwater can easily penetrate into the asphalt pavement, leading to the further development of pavement defects (such as large-scale cracks, potholes, etc.), thereby reducing the performance and service life of the road. Frequent braking, starting and turning of vehicles are the main causes of road defects. Under the combined effect of horizontal wheel load and vertical load, the asphalt pavement will cause the shear stress generated in the pavement structure layer to exceed the shear strength of the material itself, or produce shear fatigue under the action of vehicle cyclic load, causing the shear plastic deformation of the pavement material to accumulate continuously, thus causing the pavement to have defects.
[0003] The root cause of the prevention and treatment of such diseases lies in improving the shear strength of the lanes at the turns. The common method is to replace the pavement material at the turns with cement concrete with better bearing capacity, especially shear strength; or reduce the pavement load, that is, by limiting the load and speed or increasing the turning radius, to reduce the horizontal shear stress applied to the pavement when the vehicle turns. However, mountain roads are often designed with small adjustable space for flat curves, and usually need to meet the requirements for heavy-loaded vehicles to pass. Therefore, the above measures often have many application restrictions in mountain road projects. Utility Model Content
[0004] In view of the above-mentioned defects in the prior art, an asphalt concrete pavement is provided with embedded parts at defective parts at turning points, so as to improve the deformation resistance of the asphalt pavement and ensure its normal service life.
[0005] The technical solution adopted by the utility model to solve the above technical problems is:
[0006] An asphalt concrete pavement with embedded parts installed at defective parts at a bend, wherein the asphalt concrete pavement at the bend includes a first straight segment, an arc segment, and a second straight segment; the characteristic is that it also includes an arc-shaped embedded part, a plurality of spokes are arranged at intervals in the arc-shaped embedded part, and the spokes are arranged along a radial direction; in the arc segment of the asphalt concrete pavement, one or more layers of arc-shaped embedded parts are arranged according to the width of the pavement and the width of the arc-shaped embedded parts; the starting point of the arc-shaped embedded part is located at the first straight segment, and the end point of the arc-shaped embedded part is located at the second straight segment.
[0007] According to the above technical scheme, the asphalt pavement includes a base layer and an asphalt layer. The arc-shaped embedded parts are fixed on the base layer, and the arc-shaped embedded parts are placed in the asphalt layer. The height of the arc-shaped plate embedded parts is designed according to the thickness of the asphalt layer. The height difference between the upper surface of the asphalt layer and the top of the arc-shaped embedded parts is d, and the value range of d is 3cm to 7cm.
[0008] According to the above technical solution, the center of the arc-shaped embedded part coincides with the center of the arc-shaped area at the turning point.
[0009] According to the above technical scheme, the arc-shaped embedded parts include multiple layers of arc plates arranged along the width direction of the road surface, spoke plates connected between the arc plates, and fixed supports. The multiple layers of arc plates, spoke plates and fixed supports are fixedly connected to each other to form a whole, presenting an arc-shaped belt structure; the arc-shaped embedded parts are fixed to the base layer through the fixed supports.
[0010] According to the above technical solution, the spacing between the arc plates of the arc-shaped embedded parts is b, and the road surface width of the arc section at the turning point is a; the width of the embedded parts needs to be set to 0.6a~0.8a, and the number of arc plates needs to be set to 0.6a / b+1~0.8a / b+1.
[0011] According to the above technical solution, the arc plates are all made of one piece, the spoke plates are fixedly connected between two adjacent layers of arc plates, and a plurality of fixed supports are fixedly connected on the arc plates, the spoke plates, or the arc plates and the spoke plates.
[0012] According to the above technical solution, the arc plates are assembled by fixing and connecting multiple sections of small-sized standard parts, the spoke plates are fixedly connected between two adjacent layers of arc plates, and multiple fixed supports are fixedly connected to the arc plates, the spoke plates, or the arc plates and the spoke plates.
[0013] According to the above technical solution, the fixed support adopts a latch structure, which is composed of a socket and an expansion screw fixed on the arc plate or the spoke plate, and the height of the socket is 1 / 3 to 1 / 2 of the height of the spoke plate.
[0014] According to the above technical solution, the distance between two adjacent spokes at the connection of the inner arc plate is in the range of 0.8m to 1.5m; the thickness of the arc plate and the web plate is not less than 4mm.
[0015] According to the above technical solution, the starting point and the end point of the arc-shaped embedded part are switched from the first straight line segment and the second straight line segment to the ends of the arc segment close to the first straight line segment and the second straight line segment.
[0016] The utility model has the following beneficial effects:
[0017] 1. After the road base is paved, rolled and maintained, one or more layers of arc-shaped embedded parts are set at the bends of the road according to the flat curve design, where it is pre-determined that the asphalt surface layer may be damaged by vehicle loads. The arc-shaped embedded parts are used to enhance the integrity of the surface asphalt in this area, forming a structure similar to reinforced concrete; when the road surface in this area is subjected to horizontal shear loads and vertical extrusion loads from wheels, the presence of the internal spokes of the arc-shaped embedded parts effectively prevents the displacement of the asphalt pavement along the circular curve direction at the bend of the road. The arc-shaped embedded parts effectively prevent the displacement of the asphalt pavement along the radius of the circular curve at the bend of the road. By improving the overall shear strength of the asphalt pavement at the bend, the shear damage to the asphalt surface layer of the road caused by frequent driving, braking, starting and turning of heavy-loaded vehicles is effectively reduced, thereby improving the normal service life of the road.
[0018] 2. Set the arc-shaped embedded parts at 60% to 80% of the outermost width of the lane, and set multiple layers of arc plates according to the specific width. The multiple layers of arc plates cooperate with the spoke plates between adjacent arc plates to divide the easily damaged asphalt surface layer into multiple sector-shaped grids, thereby effectively resisting the shear damage to the road asphalt surface layer caused by frequent driving, braking, starting and turning of heavy-loaded vehicles.
[0019] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiment of the utility model with the accompanying drawings. The specific implementation method of the utility model is given in detail by the following embodiments and their drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present application. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.
[0021] Figure 1 It is the area where the asphalt pavement is easily damaged by load at the bend of a certain road section;
[0022] Figure 2 It is a schematic diagram of the first embodiment of the utility model providing a fixed arrangement of an arc-shaped embedded part on a roadbed at a turning point;
[0023] Figure 3 It is a structural schematic diagram of the arc-shaped embedded part of the first embodiment provided by the utility model;
[0024] Figure 4 It is a structural schematic diagram of an arc-shaped embedded part of a second embodiment provided by the utility model;
[0025] In the figure, 1, first straight segment; 2, arc segment; 3, second straight segment; 4, arc embedded part; 4-1, spoke plate; 4-2, arc plate; 4-3, fixed support; 5, base layer; 6, asphalt layer. DETAILED DESCRIPTION
[0026] The following is combined with Figure 1-4 The principles and features of the present invention are described, and the examples given are only used to explain the present invention, and are not used to limit the scope of the present invention. The present invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become clearer according to the following description and claims. It should be noted that the drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.
[0027] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a component centered. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a component centered. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a component centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.
[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.
[0029] Reference Figure 1 to Figure 4 As shown, the utility model provides an asphalt concrete pavement with embedded parts arranged at the defective parts at the turning point.
[0030] Example 1
[0031] The asphalt concrete pavement at the turning point includes a first straight segment 1, an arc segment 2, and a second straight segment 3; it also includes an arc-shaped embedded part 4, in which a plurality of spokes 4-1 are arranged at intervals, and the spokes are arranged along the radial direction; in the arc segment of the asphalt concrete pavement, one or more layers of arc-shaped embedded parts are arranged according to the width of the pavement and the width of the arc-shaped embedded parts; the starting point of the arc-shaped embedded part is located in the first straight segment, and the end point of the arc-shaped embedded part is located in the second straight segment.
[0032] In this embodiment, after the road base is paved, rolled and maintained, one or more layers of arc-shaped embedded parts are set at the places where the asphalt surface layer may be damaged by vehicle loads according to the flat curve design of the road. The arc-shaped embedded parts are used to enhance the integrity of the surface asphalt in this area, forming a structure similar to reinforced concrete; when the road surface in this area is subjected to horizontal shear loads and vertical extrusion loads from wheels, the presence of the internal spokes of the arc-shaped embedded parts effectively prevents the displacement of the asphalt pavement along the direction of the circular curve at the road bend, and the presence of the arc-shaped embedded parts effectively prevents the displacement of the asphalt pavement along the radius of the circular curve at the road bend. By improving the overall shear strength of the asphalt pavement at the bend, the shear damage to the asphalt surface layer of the road caused by frequent driving, braking, starting and turning of heavy-loaded vehicles is effectively reduced, thereby improving the normal service life of the road.
[0033] In Example 1, the asphalt pavement generally includes a base layer 5 and an asphalt layer 6, the arc-shaped embedded parts are fixed on the base layer, and the arc-shaped embedded parts are placed in the asphalt layer; the height of the arc-shaped plate embedded parts is designed according to the thickness of the asphalt layer, and the height difference between the upper surface of the asphalt layer and the top of the arc-shaped embedded parts is d, and the value range of d is 3cm to 7cm, and 5cm is selected in this embodiment. Asphalt pavement can also adopt other structural forms.
[0034] Example 2
[0035] The structure and principle of Example 2 are similar to those of Example 1, except that in order to better exert the effect of the present invention at the bend of the asphalt pavement, the center of the arc-shaped embedded part coincides with the center of the arc-shaped area at the bend.
[0036] In Examples 1 and 2, the arc-shaped embedded parts include a plurality of arc plates 4-2 arranged along the width direction of the road surface, spoke plates connected between the arc plates, and fixed supports 4-3. The plurality of arc plates, spoke plates and fixed supports are fixedly connected to each other to form a whole, presenting an arc-shaped belt-like structure; the arc-shaped embedded parts are fixed to the base layer through the fixed supports.
[0037] In Example 2, as road vehicles are traveling at a bend and are affected by centrifugal force, the asphalt pavement as a whole will have a displacement effect in the direction of increasing the turning radius. Therefore, it is believed that the pavement near the edge of the pavement is more likely to deform and damage under load, so the lane close to the outside of the bend is regarded as an area where embedded parts need to be prevented from protecting the pavement. The range in which embedded parts need to be placed is 60% to 80% of the outermost width of the lane, that is, the outermost width of the lane is a, and the protected area is 0.6a to 0.8a; if the spacing between the arc plates of the arc-shaped embedded parts is b, the number of arc plates required is 0.6a / b+1 to 0.8a / b+1. If the spacing between each layer of arc plates of the embedded parts is 1m, then (0.7a) / 1 is the number of layers of the embedded parts. For example, if the lane width is 3m, the width of the protected area is 2.1m, and the number of embedded parts layers is 3.
[0038] Example 3
[0039] The structure and principle of Example 3 are similar to those of Example 1 or 2, except that: a structural form of an arc plate is provided, the arc plates are all made of one piece, the spoke plates are fixedly connected between two adjacent layers of arc plates, and a plurality of fixed supports are fixedly connected to the arc plates, the spoke plates, or the arc plates and the spoke plates. The fixed connection method is mostly a welding or bolted fixed connection method.
[0040] Example 4
[0041] The structure and principle of Example 4 are similar to those of Example 1 or 2, except that another arc plate structure is provided, wherein the arc plates are assembled by fixing and connecting multiple small-sized standard parts, the spoke plates are fixedly connected between two adjacent layers of arc plates, and multiple fixed supports are fixedly connected to the arc plates, the spoke plates, or the arc plates and the spoke plates. The fixed connection method is mostly a welding or bolted fixed connection method.
[0042] In Examples 1-4, the fixed support adopts a latch structure, which consists of a socket and an expansion screw fixed on the arc plate or the spoke plate, and the height of the socket is 1 / 3 to 1 / 2 of the height of the spoke plate. Taking the cement stabilized gravel base as an example, the curve line shape and number of the arc plate, as well as the number and spacing of the spoke plates are designed according to the flat curve at the turning point. After the arc embedded parts are made, they are placed at the position where the asphalt surface layer is prone to damage, and the arc embedded parts are fixed to the cement stabilized gravel base with expansion bolts, and the two form a rigid connection. In the embodiment in the figure, the socket is fixed at the connection between the spoke plate and the arc plate.
[0043] In Examples 1-4, the spacing between two adjacent spokes at the connection point of the inner arc plate is in the range of 0.8m to 1.5m, and 1m is selected in this example; the thickness of the arc plate and the web plate is not less than 4mm, and 5mm is selected in this example.
[0044] Example 5
[0045] The structure and principle of Example 5 are similar to those of Example 1 or 2, except that: if the turning point is a multi-segment continuous curve and the first straight line segment and the second straight line segment do not exist; the starting point and the end point of the arc-shaped embedded part are switched from the first straight line segment and the second straight line segment to the end of the arc segment close to the first straight line segment and the second straight line segment.
[0046] Working process and principle of this utility model:
[0047] (1) According to the road design parameters, determine the weak areas of the road surface and design arc-shaped embedded parts
[0048] The present invention is aimed at the area where the road turning radius is small and the asphalt pavement is easily sheared under heavy load. According to the specific size of the area, the arc plate curve radius and length in the arc embedded part and the length of the spoke are designed accordingly. The plate thickness is 5mm, the height is the thickness of the asphalt surface layer minus 5cm, and the spacing of the spokes is 1m (the distance between adjacent spokes along the inner arc plate is the spacing value).
[0049] (2) Normal paving of the road base
[0050] Paving and maintenance of road base
[0051] (3) Install embedded parts
[0052] The arc-shaped embedded parts are placed on the base layer according to the position of the weak area of the asphalt pavement, fixed through the bolt holes with expansion bolts, and the embedded part device is fixed as a whole on the upper part of the pavement base layer with a rigid connection method.
[0053] (4) Asphalt pavement is laid normally
[0054] After the asphalt pavement is laid, normal rolling and maintenance are carried out, the embedded parts can play a role in improving the overall shear strength of the asphalt surface layer.
[0055] Taking the cement stabilized gravel base as an example, after the base is paved, rolled and maintained, the flat curve design of the road is used to pre-judge the places where the asphalt surface layer may be damaged by vehicle load at the bends of the road, and the curve line shape of the arc plate and the number and spacing of the spokes are designed according to the flat curve at the specific location. After the arc embedded parts are made, they are placed at the location where the asphalt surface layer is prone to damage, and the device is fixed to the cement stabilized gravel base with expansion bolts, forming a rigid connection between the two. Subsequently, the asphalt surface layer is paved and rolled on the base of the preset device, and finally the maintenance is completed.
[0056] Under the action of the arc-shaped embedded device, the surface asphalt in this area has stronger integrity, similar to a reinforced concrete structure. When the road surface in this area is subjected to horizontal shear load and vertical extrusion load from the wheels, the presence of the radial plate effectively prevents the displacement of the asphalt pavement along the circular curve direction at the road bend, and the presence of the inner arc plate effectively prevents the displacement of the asphalt pavement along the circular curve radius direction at the road bend. By improving the overall shear strength of the asphalt pavement at the bend, the shear damage to the asphalt surface layer of the road caused by frequent driving, braking, starting and turning of heavy-loaded vehicles is effectively reduced, thereby improving the normal service life of the road.
[0057] The above description is only a preferred embodiment of the utility model and does not impose any form of limitation on the utility model. Any ordinary technician in the industry can smoothly implement the utility model as shown in the drawings of the specification and described above. However, any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the utility model using the technical content disclosed above are all equivalent embodiments of the utility model. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the utility model are still within the protection scope of the technical solution of the utility model.
Claims
1. An asphalt concrete pavement with embedded parts installed at a defective part at a turning point, wherein the asphalt concrete pavement at the turning point comprises a first straight segment, an arc segment, and a second straight segment; characterized in that: It also includes an arc-shaped embedded part, in which a plurality of spoke plates are arranged at intervals, and the spoke plates are arranged in a radial direction; in the arc section of the asphalt concrete pavement, one or more layers of arc-shaped embedded parts are arranged according to the width of the pavement and the width of the arc-shaped embedded part; the starting point of the arc-shaped embedded part is located at the first straight line segment, and the end point of the arc-shaped embedded part is located at the second straight line segment.
2. The asphalt concrete pavement with embedded parts installed at the defective part at the turning point according to claim 1, characterized in that: The asphalt pavement includes a base layer and an asphalt layer. The arc-shaped embedded parts are fixed on the base layer and placed in the asphalt layer. The height of the arc-shaped plate embedded parts is designed according to the thickness of the asphalt layer. The height difference between the upper surface of the asphalt layer and the top of the arc-shaped embedded parts is d, and the value range of d is 3 cm to 7 cm.
3. The asphalt concrete pavement with embedded parts installed at the defective part of the turning point according to claim 2, characterized in that: The center of the arc-shaped embedded part coincides with the center of the arc-shaped area at the turning point.
4. The asphalt concrete pavement with embedded parts installed at the defective part of the turning point according to claim 1 or 2, characterized in that: The arc-shaped embedded parts include multiple layers of arc plates arranged along the width direction of the road surface, spoke plates connected between the arc plates, and fixed supports. The multiple layers of arc plates, spoke plates and fixed supports are fixedly connected to each other to form a whole, presenting an arc-shaped belt structure; the arc-shaped embedded parts are fixed on the base layer through the fixed supports.
5. The asphalt concrete pavement with embedded parts installed at defective parts at turning points according to claim 4, characterized in that: The spacing between the arc plates of the arc-shaped embedded parts is b, and the road surface width of the arc section at the turning point is a; the width of the embedded parts needs to be set to 0.6a~0.8a, and the number of arc plates needs to be set to 0.6a / b+1~0.8a / b+1.
6. The asphalt concrete pavement with embedded parts installed at defective parts at turning points according to claim 4, characterized in that: The arc plates are all made of one piece, the spoke plates are fixedly connected between two adjacent layers of arc plates, and a plurality of fixed supports are fixedly connected on the arc plates, the spoke plates, or the arc plates and the spoke plates.
7. The asphalt concrete pavement with embedded parts installed at defective places at turning points according to claim 4, characterized in that: The arc plates are all assembled by fixedly connecting multiple sections of small-sized standard parts. The spoke plates are fixedly connected between two adjacent layers of arc plates. A plurality of fixed supports are fixedly connected on the arc plates, the spoke plates, or the arc plates and the spoke plates.
8. The asphalt concrete pavement with embedded parts installed at defective places at turning points according to claim 4, characterized in that: The fixed support adopts a latch structure, which is composed of a socket and an expansion screw fixed on the arc plate or the spoke plate. The height of the socket is 1 / 3 to 1 / 2 of the height of the spoke plate.
9. The asphalt concrete pavement with embedded parts installed at defective places at turning points according to claim 4, characterized in that: The spacing between two adjacent spokes at the connection point of the inner arc plate is in the range of 0.8m to 1.5m; the thickness of the arc plate and the web plate shall not be less than 4mm.
10. The asphalt concrete pavement with embedded parts installed at defective parts at turning points according to claim 1, characterized in that: The starting point and the end point of the arc-shaped embedded part are switched from the first straight line segment and the second straight line segment to the ends of the arc segment close to the first straight line segment and the second straight line segment.