Pavement structure layer

Abstract

The utility model discloses a pavement structure layer, which belongs to the technical field of pavement construction and comprises a subbase layer, a lower base layer, an upper base layer, a lower surface layer, a middle surface layer and an upper surface layer which are sequentially paved from bottom to top, and the subbase layer is paved on a pavement soil base layer. The pavement structure designed by the embodiment is simple to construct, and only needs to be paved, compacted and leveled layer by layer to form a double-layer sandwich structure, so that not only is the durability of a road improved, but also the drainage effect is better.

Description

Technical Field

[0001] The utility model belongs to the technical field of pavement construction, and in particular relates to a pavement structure layer. Background Art

[0002] In the prior art, a highway pavement generally includes a multi-layer structure, specifically: a road base layer and a pavement layer laid on the upper surface of the roadbed. The pavement layer can generally be paved with asphalt materials (generally high-viscosity modified asphalt, polymer-modified asphalt, rubber-modified asphalt, etc.), and then statically compacted by a roller.

[0003] Permeable asphalt pavement has environmental protection functions such as rapid water permeability and drainage, high driving safety in rainy days, and sound absorption and noise reduction. However, since its main permeability function is achieved by relying on the large pores inside it, this also causes the material to be insufficient in strength performance, especially in sections such as intersections of urban roads and bus stops. Since vehicle loads generally start and stop braking in such sections, the rubbing shear stress experienced by the road surface is much higher than that of ordinary sections. In addition, the shear resistance of permeable asphalt mixture is insufficient, so it is very easy to form early damage such as rutting, shifting and congestion, affecting its performance.

[0004] At present, the pavement layer uses two layers of polymer modified asphalt, and the underlying layers are all impermeable layers, which leads to insufficient water permeability of the pavement structure, which is easy to form road surface runoff under heavy rain and extremely heavy rain conditions, affecting the safety of the pavement. Pavement paving is to lay an impermeable layer directly on the road subgrade. Although this can prevent the water on the surface of the road from penetrating into the subgrade, surface water will still overflow from the subgrade and soak the subgrade, making the subgrade loose, affecting the stability of the upper paving structure of the subgrade, and thus affecting the service life of the road. Utility Model Content

[0005] In view of the above problems, the present application proposes a pavement structure layer, wherein the road base comprises a subbase, a lower base and an upper base. The subbase is made of graded crushed stone to form a dense reinforcement layer with good mechanical properties, and a 40cm double layer of 4.0MPa cement-stabilized crushed stone is filled thereon. The strength increases with age and quickly forms a plate body, so it has high strength, and at the same time has impermeability and frost resistance. The pavement layer is a three-layer structure consisting of a lower layer, a middle surface layer and an upper layer, and the upper layer is made of a modified asphalt horseshoe fat crushed stone mixture, and large pores are formed on the surface to accelerate the absorption speed of rainwater on the road surface. At the same time, with the two layers of asphalt concrete AC-20C and AC-25C laid from small to large particle sizes below, the accumulated water flows to the sewer along the terrain and continuously diffuses to the lower layer, thereby forming a three-dimensional diffusion state, accelerating the rapid absorption and discharge of accumulated water. The two layers of cement-stabilized crushed stone in the lower layer and the graded crushed stone in the bottom layer can avoid the situation where surface water soaks the soil base, thereby extending the service life of the road.

[0006] The technical solution adopted by the utility model is:

[0007] A pavement structure layer comprises a subbase, a lower base, an upper base, a lower layer, a middle surface layer and an upper surface layer which are laid in sequence from bottom to top, and the subbase is laid on a pavement soil base.

[0008] As a preferred method of the subbase, the subbase is filled with graded crushed stone with a thickness of 8 cm.

[0009] As a preferred method for the lower base and the upper base, both the lower base and the upper base are filled with 4.0 MPa cement-stabilized gravel, and the thickness thereof is 20 cm.

[0010] As a preferred method of the lower layer, the lower layer is filled with coarse-grained asphalt concrete AC-20C with a thickness of 7 cm, and an emulsified asphalt permeable layer is arranged between the lower layer and the upper base.

[0011] As a preferred method for the middle surface layer, the middle surface layer is filled with SBS modified medium-grained asphalt concrete AC-20C, and its thickness is 6 cm.

[0012] As a preferred mode of the upper layer, the upper layer is filled with SBS modified asphalt macadam mixture SMA-13, and the thickness thereof is 4 cm.

[0013] Furthermore, modified emulsified asphalt tack coat oil is provided between the lower layer and the middle surface layer, and between the middle surface layer and the upper layer.

[0014] Furthermore, A2 type granite curb stones are arranged on both sides of the upper base surface, the lower layer, the middle layer and the upper layer are laid between the A2 type granite curb stones, and an M7.5 mortar leveling layer is arranged at the bottom of the A2 type granite curb stones.

[0015] Furthermore, a C15 pebble concrete stopper is provided on the outer side of the A2 type granite curbstone.

[0016] Beneficial effects of the utility model:

[0017] 1. The pavement structure of this new design is composed of a subbase, a lower base, an upper base, a lower layer, a middle surface layer and an upper layer from bottom to top. The subbase adopts graded crushed stone to form a dense reinforcement layer with good mechanical properties, and the lower base and the upper base are filled with 20cm4.0MPa cement-stabilized crushed stone, with a solid surface and good impermeability and frost resistance. At the same time, an emulsified asphalt penetration layer is set between the upper base and the lower layer to seal the base layer to prevent road surface water from seeping into the roadbed, thereby extending the service life of the road.

[0018] 2. The lower layer, middle layer and upper layer are made of coarse-grained asphalt concrete, medium-grained asphalt concrete and modified asphalt horseshoe fat gravel mixture from bottom to top, and the pore sizes are also large-small-large. The modified asphalt horseshoe fat gravel mixture forms a large-pore stable structure on the road surface, which can accelerate the efficiency of road surface water absorption. The absorbed accumulated water quickly diffuses along the middle layer to the lower layer, and at the same time diffuses to the water well along the terrain, forming a three-dimensional diffusion structure, which is conducive to the rapid absorption and discharge of road surface water and improves the safety of road vehicle driving. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 This is a cross-sectional view of the pavement structure layer of this embodiment.

[0021] Among them, 1. Soil base layer; 2. Subbase layer; 3. Lower base layer; 4. Upper base layer; 5. Lower layer; 6. Middle surface layer; 7. Upper layer; 8. C15 pebble concrete block; 9. A2 granite edge stone; 10. M7.5 mortar leveling layer. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example

[0024] like Figure 1 As shown, this embodiment proposes a pavement structure layer, which includes a subbase layer 2, a lower base layer 3, an upper base layer 4, a lower layer 5, a middle surface layer 6 and an upper layer 7 laid in sequence from bottom to top, and the subbase layer 2 is laid on the pavement soil base layer 1.

[0025] The subbase 2 is paved with 8 cm thick graded gravel, and the lower base 3 and upper base 4 are paved with 20 cm thick 4.0 MPa cement stabilized gravel respectively. An emulsified asphalt penetration seal is passed between the upper base 4 and the lower layer 5, and the surface is treated with a single layer of asphalt to isolate the upper base 4 and the lower layer 5, thereby preventing water from the upper layer 5 from seeping into the base 4.

[0026] The lower layer 5 is paved with 7cm thick coarse-grained asphalt concrete AC-20C, the middle layer 6 is paved with 6cm thick SBS modified medium-grained asphalt concrete AC-20C, and the upper layer 7 is paved with 4cm thick SBS modified asphalt horseshoe fat crushed stone mixture SMA-13. Modified emulsified asphalt tack coat oil is paved between the lower layer 5 and the middle layer 6, and between the middle layer 6 and the upper layer 7 to increase the connectivity between the three layers and form an integral sandwich structure, which is conducive to the rapid absorption, diffusion and discharge of rainwater on the road surface.

[0027] A row of A2 granite curb stones 9 are laid on both sides of the surface of the upper base 4, and an M7.5 mortar leveling layer 10 is arranged at the bottom of the A2 granite curb stone 9, and is limited and fixed by a C15 pebble concrete block 8 on the outside of the A2 granite curb stone 9.

[0028] The pavement structure designed in this embodiment is simple to construct and only requires laying, compacting and leveling layer by layer to form a double-layer sandwich structure, which not only improves the durability of the road but also improves the drainage effect.

[0029] The above description is only used to illustrate the technical solution of the utility model rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the utility model by ordinary technicians in this field should be included in the scope of the claims of the utility model as long as they do not depart from the spirit and scope of the technical solution of the utility model.

Claims

1. A pavement structure layer, It is characterized in that It includes a subbase, a lower base, an upper base, a lower layer, a middle surface layer and an upper surface layer which are laid in sequence from bottom to top, and the subbase is laid on the road surface soil base; The subbase is filled with graded crushed stone with a thickness of 8cm; The lower and upper bases are filled with 4.0MPa cement-stabilized gravel, and the thickness is 20cm; The lower layer is filled with coarse-grained asphalt concrete AC-20C, with a thickness of 7 cm; An emulsified asphalt permeable layer is provided between the lower layer and the upper base layer; The middle surface layer is filled with SBS modified medium-grained asphalt concrete AC-20C, with a thickness of 6 cm; The upper layer is filled with SBS modified asphalt macadam mixture SMA-13, with a thickness of 4cm; Modified emulsified asphalt tack coat oil is provided between the lower layer and the middle surface layer, and between the middle surface layer and the upper layer; A2 granite curb stones are arranged on both sides of the upper base surface, the lower layer, the middle layer and the upper layer are laid between the A2 granite curb stones, and an M7.5 mortar leveling layer is arranged at the bottom of the A2 granite curb stones; C15 pebble concrete blocks are set on the outside of the A2 type granite edging stone.

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