CN210529401U

CN210529401U - Asphalt pavement structure with graded broken stone base

Info

Publication number: CN210529401U
Application number: CN201920958563.XU
Authority: CN
Inventors: 杨雪松
Original assignee: China Road and Bridge Corp
Current assignee: China Road and Bridge Corp
Priority date: 2019-06-24
Filing date: 2019-06-24
Publication date: 2020-05-15
Anticipated expiration: 2029-06-24

Abstract

The utility model discloses a graded broken stone base course bituminous pavement structure, including the symmetry set up in the barricade of road bed both sides with set up in the inside of barricade and by the cement that sets gradually from bottom to top stabilize graded broken stone base course, stress absorbing layer and close gradation asphalt mixture layer, wherein, the longitudinal section that graded broken stone base course, stress absorbing layer and close gradation asphalt mixture layer are constituteed is trapezoidal, and trapezoidal upper end and both sides are equipped with and soak the pitch geotechnological cloth layer, the top of soaking pitch geotechnological cloth layer and its and the interval of barricade are equipped with the pitch mixture layer that permeates water; and a plurality of drain holes are formed at the lower part of the retaining wall at intervals. The utility model has the advantages of can discharge the rainwater on the road surface fast, improve rainy day driving safety etc.

Description

Asphalt pavement structure with graded broken stone base

Technical Field

The utility model relates to a highway building technical field. More specifically, the utility model relates to a gradation rubble basic unit bituminous pavement structure.

Background

The asphalt pavement has become the main pavement structure form in China due to the advantages of comfortable driving, low noise, convenient maintenance and the like. In the existing asphalt pavement structure, in order to avoid water on the pavement from permeating into the base layer to cause water damage, the surface layer is mostly provided with a compact impervious asphalt mixture layer, but water is easy to accumulate in rainy days, so that water drift and water mist appear in driving, and driving safety is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a gradation rubble basic unit bituminous pavement structure, its rainwater on the ability quick discharge road surface improves rainy day driving safety.

In order to achieve the objects and other advantages according to the present invention, there is provided a graded crushed stone base asphalt pavement structure comprising retaining walls symmetrically disposed on both sides of a roadbed, and a cement stabilized graded crushed stone base, a stress absorbing layer and a dense graded asphalt mixture layer disposed inside the retaining walls in this order from bottom to top, wherein,

the longitudinal section of the graded broken stone base layer, the stress absorbing layer and the dense graded asphalt mixture layer is trapezoidal, the upper bottom and two sides of the trapezoid are provided with asphalt-saturated geotechnical cloth layers, and the top of each asphalt-saturated geotechnical cloth layer and the intervals between the asphalt-saturated geotechnical cloth layer and the retaining wall are provided with permeable asphalt mixture layers; and a plurality of drain holes are formed at the lower part of the retaining wall at intervals.

Preferably, the graded broken stone base asphalt pavement structure further comprises a reinforcing mesh which is arranged inside the retaining wall and covers the plurality of drainage holes, and the aperture of the reinforcing mesh is smaller than the particle size of the particles forming the permeable asphalt mixture layer; and the drainage pipeline is arranged outside the retaining wall, and the upper part of the drainage pipeline is communicated with the plurality of drainage holes.

Preferably, in the graded broken stone base asphalt pavement structure, any drainage hole is arranged downwards towards the outside of the retaining wall.

Preferably, the graded broken stone base course bituminous pavement structure, the barricade be L shape, including integrated into one piece's horizontal part and vertical portion, the horizontal part sets up inwards, a plurality of wash ports are located the lower part of vertical portion, just the cement is stabilized the height that graded broken stone base course is greater than the height of horizontal part.

Preferably, in the graded crushed stone base asphalt pavement structure, the stress absorption layer is an SMA-5 asphalt mixture layer, and the dense graded asphalt mixture layer is an AC-16 asphalt mixture layer.

Preferably, the graded broken stone base asphalt pavement structure is characterized in that the thickness of the cement-stabilized graded broken stone base is 12-14 cm; the thickness of the graded broken stone base layer is 18-20 cm; the thickness of the stress absorption layer is 2-4 cm; the thickness of the dense-graded asphalt mixture layer is 8-10 cm; the thickness of the asphalt-impregnated geotechnical cloth layer is 1-2 cm; the distance between the top of the asphalt-saturated geotextile layer and the retaining wall is 25-30 cm; the thickness of the permeable asphalt mixture layer above the top of the saturated asphalt geotextile layer is 6-8 cm.

The utility model has the advantages that: the graded broken stone base layer and the stress absorption layer are arranged between the cement stabilized graded broken stone base layer and the dense graded asphalt mixture layer, and the stress absorption layer can be bonded with the graded broken stone base layer and the dense graded asphalt mixture layer, so that the absorption and dissipation effects of the graded broken stone base layer on the strain energy of the cement stabilized graded broken stone base layer are improved, the upward diffusion of cracks is effectively avoided, and the generation of road surface reflection cracks is reduced and delayed; through with grading rubble basic unit, the longitudinal section that stress absorbing layer and close gradation mix bed of material are constituteed sets up to trapezoidal, and set up the saturated pitch geotechnological cloth layer at trapezoidal upper base and both sides, set up the pitch mixture bed of permeating water on the saturated pitch geotechnological cloth layer and between saturated pitch geotechnological cloth layer and the barricade, set up the wash port in the lower part of barricade, the saturated pitch geotechnological cloth layer can bond the pitch mixture bed of permeating water and grading rubble basic unit, the stress absorbing layer, close gradation mix the layer of pitch, effectively avoid the road surface layering, the bearing capacity on improvement road surface, the pitch mixture bed of permeating water can be discharged the rainwater of infiltration by the wash port fast, rainy day driving.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.

Drawings

Fig. 1 is a schematic longitudinal sectional structure view of a graded crushed stone base asphalt pavement structure according to an embodiment of the present invention.

Detailed Description

The present invention is further described in detail below with reference to the drawings so that those skilled in the art can implement the invention with reference to the description.

It is to be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials, if not otherwise specified, are commercially available; in the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

As shown in fig. 1, the utility model provides a graded broken stone base asphalt pavement structure, including the symmetry set up in retaining wall 1 of road bed 11 both sides and set up in the inside of retaining wall 1 and by the cement that sets gradually from bottom to top stabilize graded broken stone base 2, graded broken stone base 3, stress absorbing layer 4 and close graded asphalt mixture layer 5, wherein, the longitudinal section that graded broken stone base 3, stress absorbing layer 4 and close graded asphalt mixture layer 5 are constituteed is trapezoidal, and trapezoidal upper end and both sides are equipped with soakage pitch geotechnological cloth layer 6, the top of soakage pitch geotechnological cloth layer 6 and its and the intermittent type of retaining wall 1 are equipped with pervious pitch mixture layer 7; a plurality of drain holes 8 are arranged at intervals at the lower part of the retaining wall 1. The stress absorbing layer is made of SMA-5 asphalt mixture, and the oil-stone ratio of the stress absorbing layer is 6.4%; the dense-graded asphalt mixture layer is an AC-16 asphalt mixture; soaking the asphalt geotextile layer with SBS modified asphalt; the porous pervious asphalt mixture with porosity larger than 20% is selected as the pervious asphalt mixture layer.

The cement stabilized graded broken stone base is connected with the bottom of the retaining wall, so that stable support can be provided for the upper layer structure of the cement stabilized graded broken stone base; a graded broken stone base layer and a stress absorption layer are arranged between the cement stabilized graded broken stone base layer and the dense graded asphalt mixture layer, and the stress absorption layer can be bonded with the graded broken stone base layer and the dense graded asphalt mixture layer, so that the absorption and dissipation effects of the graded broken stone base layer on the strain energy of the cement stabilized graded broken stone base layer are improved, the upward diffusion of cracks is effectively avoided, the generation of reflection cracks of a road surface is reduced and delayed, and meanwhile, the bearing capacity of the road surface is improved; the graded broken stone base layer, the longitudinal section that stress absorbing layer and close-graded asphalt mixture layer are formed is set to be trapezoidal, and set up the saturated asphalt geotechnological cloth layer at trapezoidal upper end and both sides, set up the pitch mixture layer that permeates water on the saturated asphalt geotechnological cloth layer and between saturated asphalt geotechnological cloth layer and the barricade, set up the wash port in the lower part of barricade, the saturated asphalt geotechnological cloth layer can bond the pitch mixture layer that permeates water and graded broken stone base layer, the stress absorbing layer, close-graded asphalt mixture layer, effectively avoid the road surface layering, the bearing capacity on improvement road surface, the pitch mixture layer that permeates water can be discharged the rainwater that permeates by the wash port of road surface both sides fast, improve rainy.

As shown in fig. 1, the graded broken stone base asphalt pavement structure further includes a reinforcing mesh 9, which is disposed inside the retaining wall 1 and covers the plurality of water drainage holes 8, wherein the diameter of the reinforcing mesh 9 is smaller than the particle size of the particles constituting the permeable asphalt mixture layer 7, so as to prevent the particles in the permeable asphalt mixture layer 7 from blocking the water drainage holes 8, and to improve the adhesion between the permeable asphalt mixture layer and the retaining wall, so as to improve the overall stability of the pavement structure; and the drainage pipeline 10 is arranged outside the retaining wall 1, the upper part of the drainage pipeline 10 is communicated with the drainage holes, and is used for collecting rainwater drained from the drainage holes 8 and draining the rainwater or leading the rainwater into a municipal drainage pipeline in time.

As shown in fig. 1, in the graded crushed stone base asphalt pavement structure, any drainage hole 8 is arranged downwards towards the outside of the retaining wall 1, so as to improve the lateral bearing capacity of the retaining wall.

Retaining wall 1 is L shape, including integrated into one piece's horizontal part 101 and vertical portion 102, horizontal part 101 sets up inwards, a plurality of wash ports 8 are located vertical portion 102's lower part, just cement is stabilized the height that graded broken stone basic unit 2 is greater than horizontal part 101's height to make cement stabilize graded broken stone basic unit 2 with retaining wall 1 links as an organic wholely, further improves the bearing capacity on road surface.

As shown in fig. 1, in the graded broken stone base asphalt pavement structure, the thickness of the cement stabilized graded broken stone base 2 is 12-14 cm; the thickness of the graded broken stone base layer 3 is 18-20 cm; the thickness of the stress absorption layer 4 is 2-4 cm; the thickness of the dense-graded asphalt mixture layer 5 is 8-10 cm; the thickness of the asphalt-impregnated geotechnical cloth layer 6 is 1-2 cm; the distance between the top of the asphalt-saturated geotextile layer 6 and the retaining wall 1 is 25-30 cm; the thickness of the permeable asphalt mixture layer 7 positioned above the top of the asphalt-saturated geotextile layer 6 is 6-8 cm; the water-permeable pavement has the advantages that the water-permeable pavement has the water permeability, the bearing capacity of the pavement is improved, pavement cracking is reduced and delayed, and the service life of the pavement is prolonged.

While the embodiments of the invention have been described above, it is not intended to be limited to the details shown, or described, but rather to cover all modifications, which would come within the scope of the appended claims, and all changes which come within the meaning and range of equivalency of the art are therefore intended to be embraced therein.

Claims

1. The graded broken stone base asphalt pavement structure is characterized by comprising retaining walls symmetrically arranged on two sides of a roadbed, and a cement stabilized graded broken stone base, a stress absorbing layer and a dense graded asphalt mixture layer which are arranged in the retaining walls in sequence from bottom to top, wherein,

2. The graded crushed stone base asphalt pavement structure according to claim 1, further comprising a reinforcing mesh which is provided inside the retaining wall and covers the plurality of water discharge holes, the reinforcing mesh having a pore size smaller than the particle size of the particles constituting the water-permeable asphalt mixture layer; and the drainage pipeline is arranged outside the retaining wall, and the upper part of the drainage pipeline is communicated with the plurality of drainage holes.

3. The graded crushed stone base asphalt pavement structure as set forth in claim 1, wherein any of the drainage holes is provided obliquely downward toward the outside of the retaining wall.

4. The graded crushed stone base asphalt pavement structure as set forth in claim 1, wherein said retaining wall is L-shaped and includes a horizontal portion and a vertical portion which are integrally formed, said horizontal portion being disposed inward, said plurality of drain holes being provided in a lower portion of said vertical portion, and a height of said cement stabilized graded crushed stone base is greater than a height of said horizontal portion.

5. The graded crushed stone base asphalt pavement structure according to claim 1, wherein the stress absorbing layer is an SMA-5 asphalt mixture layer, and the dense graded asphalt mixture layer is an AC-16 asphalt mixture layer.

6. The graded crushed stone base asphalt pavement structure as set forth in claim 5, wherein the cement stabilized graded crushed stone base has a thickness of 12-14 cm; the thickness of the graded broken stone base layer is 18-20 cm; the thickness of the stress absorption layer is 2-4 cm; the thickness of the dense-graded asphalt mixture layer is 8-10 cm; the thickness of the asphalt-impregnated geotechnical cloth layer is 1-2 cm; the distance between the top of the asphalt-saturated geotextile layer and the retaining wall is 25-30 cm; the thickness of the permeable asphalt mixture layer above the top of the saturated asphalt geotextile layer is 6-8 cm.