CN219157314U - A zero-waste low-carbon pavement structure for current road renovation - Google Patents

Abstract

The utility model relates to a zero-waste low-carbon pavement structure for current road reconstruction, which includes an in-situ recycling base layer, a leveling layer, a multi-functional layer, a surface layer and a blind ditch, and an in-situ recycling base layer, a leveling layer, and a multi-functional layer. Layers and surface layers are stacked in sequence from bottom to top. Blind ditches are arranged on the road surface and the edge of the road surface along the horizontal and/or vertical directions of the route, and are located below the in-situ recycling base. The blind ditch is connected to the original drainage system. Utilize the waste materials after in-situ crushing treatment on the current pavement as the in-situ recycling base, and lay a leveling layer of graded gravel on it, and set up a multi-functional layer, which can stabilize the loose layer on the top surface of the graded gravel, Protect the base layer from being damaged by construction vehicles, prevent rainwater from penetrating into the base layer and the following structural layers, and strengthen the combination between the surface layer and the base layer. When the existing pavement structure is reconstructed, all the composite pavement can be used as recycled materials to realize Zero waste, greatly reducing carbon emissions, and significant economic and social benefits.

Description

A zero-waste low-carbon pavement structure for current road renovation

technical field

The utility model relates to the technical field of road traffic, in particular to a zero-waste low-carbon pavement structure for existing road reconstruction.

Background technique

In recent years, highways and urban roads have used a large number of cement concrete + asphalt concrete composite pavement structures. The formation is mainly due to the following two reasons. One is that the early road pavement structure is dominated by cement pavement, and later upgrades may improve road comfort. The second is to directly build a new composite pavement structure in order to improve road stiffness and durability. With the increase of service life, rutting, reflective cracks and other structural damages appear in the composite pavement structure, which must be reconstructed and upgraded. Removing all asphalt concrete and cement concrete and building new ones will generate a lot of waste, which is economical, and the new pavement structure will also generate a lot of carbon emissions. If all the existing pavement structures are used as recycled materials, carbon will be greatly reduced. Emissions are conducive to the realization of the country's "double carbon" goal. Aiming at this, a zero-waste low-carbon pavement structure system is proposed.

Contents of the invention

The technical problem to be solved by the utility model is to provide a zero-waste low-carbon pavement structure for the current road reconstruction, which reduces the waste amount of the current compound pavement structure type road reconstruction, and effectively reduces the road construction process. carbon emissions in .

The technical solution of the utility model to solve the above technical problems is as follows: a zero-waste low-carbon pavement structure for current road reconstruction, including in-situ recycling base, leveling layer, multi-functional layer, surface layer and blind ditch, the in-situ Recycling base layer, leveling layer, multi-functional layer, and surface layer are stacked sequentially from bottom to top, and the blind ditch is arranged on the edge of the road surface along the lateral and/or longitudinal direction of the road surface, and is located below the in-situ recycling base layer , the blind ditch is connected with the original drainage system.

The beneficial effects of the utility model are: the zero-waste low-carbon pavement structure of the current road reconstruction of the present utility model uses the waste material after the in-situ crushing treatment of the current pavement as the in-situ recycling base, and paves the graded pavement on it. For the leveling layer of gravel, a multi-functional layer is set, which can stabilize the loose layer on the top surface of the graded gravel, protect the base layer from being damaged by construction vehicles, prevent rainwater from seeping into the base layer and the structural layer below, and strengthen the gap between the surface layer and the base layer. The pavement structure can use all the composite pavement as recycled materials during the reconstruction of the existing pavement structure, realize zero waste, greatly reduce carbon emissions, and have significant economic and social benefits.

On the basis of the above-mentioned technical solution, the utility model can also be improved as follows:

Further: the in-situ recycling base is formed by milling the asphalt mixture of the existing composite pavement, and recycling the existing cement concrete pavement after in-situ crushing treatment.

The beneficial effect of the above further scheme is: after milling the asphalt mixture of the existing composite road surface, and recycling the existing cement concrete pavement after in-situ crushing treatment, on the one hand, carbon emissions can be reduced, which is beneficial to environmental protection, On the other hand, it can reduce the amount of construction, reduce costs, and shorten the construction period.

Further: the multi-functional layer is made of crushed stone, and is made by surface treatment, slurry sealing or crushed stone sealing by layer paving method, and the thickness of the multi-functional layer is 0.6cm--2cm.

The beneficial effects of the above-mentioned further scheme are: by adopting crushed stones, and adopting the layer paving method for surface treatment, slurry sealing layer or crushed stones sealing layer, the top surface loose layer of crushed stones and the protective base layer can be graded in the leveling layer. It has multiple functions such as not being damaged by construction vehicles, preventing rainwater from seeping into the base layer and the structural layer below, and strengthening the combination between the surface layer and the base layer.

Further: the surface layer includes a lower layer, a middle layer and an upper layer, and the lower layer, the middle layer and the upper layer are sequentially stacked on the multifunctional layer from bottom to top.

Further: the upper layer is warm-mix asphalt mixture, the middle surface layer is factory-mixed hot-mixed asphalt mixture, and the lower layer is recycled hot-mix asphalt mixture.

Further: the lower layer adopts the remaining reclaimed material of the factory-mixed hot recycled asphalt mixture of the middle surface layer.

Further: the blind ditch is provided with porous pipes, reverse filter fabrics and single-graded crushed stones, the reverse filter fabric is arranged around the outer wall of the porous pipe, and the single-graded crushed stones are backfilled in the reverse filter within the outer voids of the fabric.

Description of drawings

Fig. 1 is the structural representation of the zero-waste low-carbon pavement structure of the existing road reconstruction of an embodiment of the utility model;

Fig. 2 is a schematic structural diagram of a blind ditch according to an embodiment of the present invention.

In the accompanying drawings, the list of parts represented by each label is as follows:

A-1, in-situ recycling base layer, A-2, leveling layer, A-3, multi-functional layer, A-4, lower layer, A-5, middle layer, A-6, upper layer, B- 1. Porous tube, B-2, reverse filter fabric, B-3, single-stage gravel.

Detailed ways

The principles and features of the present utility model are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the utility model, and are not used to limit the scope of the utility model.

As shown in Figure 1, a zero-waste low-carbon pavement structure for current road reconstruction includes in-situ recycling base A-1, leveling layer A-2, multi-functional layer A-3, surface course and blind ditch. The above-mentioned in-situ recycling base layer A-1, leveling layer A-2, multi-functional layer A-3, and surface layer are stacked sequentially from bottom to top, and the blind ditch is arranged on the road surface and The edge of the pavement is located below the in-situ recycling base A-1, and the blind ditch is connected to the original drainage system.

The zero-waste low-carbon pavement structure of the current road reconstruction of the present utility model uses the waste material after the in-situ crushing treatment of the current pavement as the in-situ recycling base A-1, and paves the leveling graded gravel on it Layer A-2, set multi-functional layer A-3, which can stabilize the loose layer on the top surface of graded crushed stone, protect the base layer from being damaged by construction vehicles, prevent rainwater from seeping into the base layer and the following structural layers, and strengthen the surface layer and the base layer With the combination of these materials, the pavement structure can use all the composite pavement as recycled materials during the reconstruction of the existing pavement structure, realize zero waste, greatly reduce carbon emissions, and have significant economic and social benefits.

In one or more embodiments of the present invention, the in-situ recycling base A-1 is milled from the asphalt mixture of the existing composite road surface, and the existing cement concrete pavement is crushed and then regenerated Take advantage of formation. By milling the asphalt mixture of the existing composite pavement, and recycling the existing cement concrete pavement after in-situ crushing treatment, on the one hand, it can reduce carbon emissions and help protect the environment; on the other hand, it can reduce the amount of construction. Reduce costs and shorten construction periods.

In practice, firstly, the asphalt mixture of the existing composite pavement is milled, and the existing cement concrete pavement is crushed on-site with recycling as the base layer. The on-site crushing can be carried out by multi-hammer crushing and resonance crushing After crushing, a test pit should be excavated for inspection. The top surface should be thin and the bottom surface should be thick, and the top surface should not be too thin.

In one or more embodiments of the present utility model, the leveling layer A-2 is located on the in-situ recycled base layer A-1 formed after the in-situ crushing of the existing cement concrete pavement, so as to meet the requirements of the longitudinal slope of the road. and cross slope requirements, if the requirements can be met after crushing, this layer can be cancelled.

In one or more embodiments of the present utility model, the multi-functional layer A-3 is made of crushed stones, and is made by layer paving method surface treatment, slurry sealing layer or crushed stone sealing layer, and the multi-functional layer A-3 The thickness of the functional layer A-3 is 0.6cm--2cm. By adopting crushed stones, surface treatment by layer laying method, slurry sealing layer or crushed stones sealing layer, the loose layer on the top surface of crushed stones can be distributed in the leveling layer A-2, and the base layer can be protected from being damaged by construction vehicles. , Prevent rainwater from penetrating into the base layer and the lower structural layer, and strengthen the combination between the surface layer and the base layer and other multiple functions.

In one or more embodiments of the present utility model, the surface layer includes the lower layer A-4, the middle layer A-5 and the upper layer A-6, the lower layer A-4, the middle layer A- 5 and the upper layer A-6 are sequentially stacked on the multifunctional layer A-3 from bottom to top.

In one or more embodiments of the present utility model, the upper layer A-6 is a warm-mix asphalt mixture, the middle surface layer A-5 is a factory-mixed hot recycled asphalt mixture, and the lower layer A- 4 is recycled hot mix asphalt mixture.

Specifically, the upper layer A-6 is warm-mix asphalt mixture WMA, located on the uppermost layer, using recycled aggregates formed after construction waste is damaged, sieved, and sorted, without basically changing the mix ratio and In the case of construction technology, technical means are adopted to make the mixing temperature of asphalt mixture lower than that of similar hot-mix asphalt mixture, and can meet the road performance requirements of hot-mix asphalt mixture.

The middle surface layer A-5 is factory-mixed hot recycled asphalt mixture, which is located under the upper layer A-6. After milling the asphalt surface layer in the current composite pavement, the recycled mixed material RAP is crushed and screened in the mixing plant, and then heated and mixed with new recycled aggregate, new asphalt, and asphalt regeneration agent RA in a certain proportion of the mixture.

The lower layer A-4 is 100% recycled hot mix asphalt mixture, which is located under the middle layer A-5. Use the remaining recycled materials of the middle surface layer A-5 factory-mixed hot recycled asphalt mixture, and the binder is not for the purpose of restoring the performance of the old asphalt, and uses polyurethane, epoxy resin, curing agent and other modified asphalt binders with better performance The recycled materials are connected to realize the recycled mixture. Due to the change of the basic characteristics of asphalt materials, the road performance of the recycled mixture is no longer sensitive to indicators such as aggregate gradation, asphalt, and void ratio, and the road performance is stronger.

Optionally, in one or more embodiments of the present utility model, the lower layer (A-4) adopts the remaining reclaimed material of the factory-mixed hot recycled asphalt mixture of the middle surface layer A-5.

As shown in Figure 2, in one or more embodiments of the present utility model, the blind ditch includes a longitudinal blind ditch and a transverse blind ditch arranged on the edge of the road slab, and porous pipes are arranged in the longitudinal blind ditch and the transverse blind ditch B-1, reverse filter fabric B-2 and single-stage crushed stone B-3, the diameter of the porous tube B-1 should not be less than 10cm, and the reverse filter fabric B-2 surrounds the outside of the porous tube B-1 The single-graded crushed stone B-3 is backfilled in the external void of the filter fabric B-2, the filling height should not be less than 25cm, and the rest is backfilled with permeable materials. Here, the longitudinal blind ditch runs along the route and is at the edge of the road surface, and the horizontal blind ditch runs through the road surface at intervals of 20-40m.

The utility model proposes a zero-waste low-carbon pavement structure transformation system based on the fact that the existing road is a composite pavement structure. First, the existing asphalt mixture is milled, and the existing cement concrete is crushed by means of multi-hammer crushing and resonance crushing. The on-site gravel treatment of the pavement uses recycling as the base layer, on which a leveling layer of graded gravel is paved, which is a loose layer on the top surface of stable graded gravel, protecting the base layer from being damaged by construction vehicles, and preventing rainwater from seeping into the base layer And in the structural layer below, and strengthen the combination between the surface layer and the base layer, set up surface treatment, slurry seal layer or crushed stone seal layer. The surface layer adopts a three-layer structure, the upper layer uses recycled construction waste aggregate warm-mix asphalt mixture, the middle surface layer uses factory-mixed hot-mixed asphalt mixture, and the lower layer uses 100% recycled material hot-mix asphalt mixture. And set longitudinal blind ditch and horizontal blind ditch on the edge of road slab, and connect with the original drainage system. The pavement structure system can use all the composite pavement as recycled materials during the reconstruction of the existing pavement structure, realize zero waste, greatly reduce carbon emissions, and have significant economic and social benefits.

The zero-waste low-carbon pavement structure of the existing road reconstruction of the present utility model is based on the zero-waste and low-carbon concept, and is mainly used for roads with composite pavement structures that are seriously damaged and need to be overhauled and reconstructed. Pavement gravelization A-1 is used as the base layer, and graded crushed stone leveling layer A-2 is set to meet the requirements of longitudinal and transverse slopes of the road. Sealing layer A-3 is set on it as a multi-functional layer. The layer utilizes the current milling material to realize recycling, and the construction waste recycled aggregate warm-mix asphalt mixture is set as the upper layer, which has broad application prospects.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (7)

1. A zero-waste low-carbon pavement structure for existing road reconstruction, characterized in that: it includes an in-situ recycling base (A-1), a leveling layer (A-2), a multifunctional layer (A-3), a surface Layer and blind ditch, the in-situ recycling base layer (A-1), leveling layer (A-2), multifunctional layer (A-3), and surface layer are stacked sequentially from bottom to top, and the blind ditch is along The horizontal and/or vertical direction of the route is set on the road surface and the edge of the road surface, and is located below the in-situ recycling base (A-1), and the blind ditch is connected to the original drainage system. 2. The zero-waste low-carbon pavement structure for current road reconstruction according to claim 1, characterized in that: the in-situ recycled base (A-1) is milled from the asphalt mixture of the current composite pavement, and The existing cement concrete pavement is crushed and recycled on site. 3. The zero-waste low-carbon pavement structure for current road reconstruction according to claim 1, characterized in that: the multi-functional layer (A-3) is made of gravel, and surface treatment and slurry sealing are adopted by layer paving method or made after sealing the gravel, and the thickness of the multifunctional layer (A-3) is 0.6cm--2cm. 4. The zero-waste low-carbon pavement structure for existing road reconstruction according to claim 1, characterized in that: the surface layer comprises a lower layer (A-4), a middle layer (A-5) and an upper layer (A-5). -6), the lower layer (A-4), the middle layer (A-5) and the upper layer (A-6) are sequentially stacked on the multifunctional layer (A-3) from bottom to top. 5. The zero-waste low-carbon pavement structure for existing road reconstruction according to claim 4, characterized in that: the upper layer (A-6) is a warm-mix asphalt mixture, and the middle layer (A-5) It is factory-mixed hot recycled asphalt mixture, and the lower layer (A-4) is recycled hot-mixed asphalt mixture. 6. The zero-waste low-carbon pavement structure for current road reconstruction according to claim 5, characterized in that: the lower layer (A-4) adopts the factory-mixed heat regenerated asphalt of the middle surface layer (A-5) The remainder of the mix. 7. The zero-waste low-carbon pavement structure for current road reconstruction according to any one of claims 1-6, characterized in that: porous pipes (B-1), filter fabrics (B-1) are arranged in the blind ditch 2) and single-stage gravel (B-3), the reverse filter fabric (B-2) is set around the outer wall of the porous pipe (B-1), and the single-stage gravel (B-3 ) backfill in the external void of the reverse filter fabric (B-2).

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