CN216999144U - Pavement structure suitable for uneven settlement disease of soft foundation road section bituminous pavement - Google Patents

Abstract

The utility model provides a pavement structure suitable for uneven settlement diseases of asphalt pavements on soft foundation road sections, which comprises a prefabricated panel layer and is characterized in that: the prefabricated panel layer is laid in an excavated road groove corresponding to the uneven settlement disease, an action layer for reinforcing waterproof and interlayer combination is arranged between the prefabricated panel layer and the road groove, and a surface layer is laid on the prefabricated panel layer; the method has the advantages that the road grooves are reasonably excavated in the range of uneven settlement diseases at the soft foundation road section, the construction operation area is reduced to the maximum extent, the roadbed is not required to be reinforced by the rotary jet grouting piles in advance, the construction is rapid, and the construction period is greatly shortened; the action layer arranged between the prefabricated panel layer and the road groove can strengthen the water resistance and strengthen the interlayer combination; the pavement structure has high bearing capacity, good integrity and strong deformation resistance; the combination between each layer of the pavement structure and between the pavement structure and the roadbed is firm and reliable, and is not easy to damage.

Description

Pavement structure suitable for uneven settlement disease of soft foundation road section bituminous pavement

Technical Field

The utility model relates to the field of rapid treatment of uneven settlement diseases of pavements, in particular to a pavement structure suitable for uneven settlement diseases of asphalt pavements of soft foundation road sections.

Background

With the rapid development of economic society, the requirements of the people on the road running quality are higher and higher. In the soft soil road section, due to unstable subgrade settlement, insufficient bearing capacity and other reasons, uneven pavement settlement diseases of different degrees often exist, the running quality of the pavement is seriously reduced, and the operation safety and the road capacity of the highway are influenced. At present, the traditional method for quickly treating the differential settlement diseases of the road surfaces mainly comprises an asphalt mixture adding and paving method and an aggregate pile method, wherein the asphalt mixture adding and paving method can only temporarily maintain the flatness of the road surfaces because the road surfaces of the subgrade are not reinforced, and the aggregate pile method is not suitable for difficulty in punching holes in the subgrade filled with the slag. Therefore, the problem which is urgently needed to be solved at present is to fill the slag in the road base sections with heavy traffic and high road sealing pressure, particularly the expressway and the road base sections with communicated turns thereof, quickly treat the uneven settlement of the pavement, improve the running quality of the pavement and reduce the influence on the trip of people.

For example, a chinese utility model patent of patent No. ZL202022690872.9 (No. CN214831566U) discloses a road structure of prefabricated panels, and this road structure needs to adopt the jet grouting pile to reinforce the road foundation in advance, and the construction process is many, the construction period is long, and is big to the operation highway lane sealing pressure, is not suitable for the demand of quick construction, and this road structure is applicable to newly-built road surface, can not be used for handling the road surface that has taken place to subside the disease.

Disclosure of Invention

The utility model aims to solve the technical problem of providing a pavement structure suitable for uneven settlement of an asphalt pavement on a soft foundation road section, in particular to a slag-filled asphalt pavement on a road foundation section with high road sealing pressure.

The technical scheme adopted by the utility model for solving the technical problems is as follows: this pavement structure suitable for soft base highway section bituminous paving uneven settlement disease, including prefabricated panel layer, its characterized in that: the prefabricated panel layer is paved in an excavated road groove corresponding to the uneven settlement diseases, an action layer for reinforcing the combination of the prefabricated panel layer and the road groove is arranged between the prefabricated panel layer and the road groove, and the surface layer is paved on the prefabricated panel layer.

In order to strengthen the combination between the prefabricated panel layer and the surface layer, an anti-slip layer which can avoid interlayer slippage is preferably arranged between the prefabricated panel layer and the surface layer.

In order to improve the load stress diffusion capacity of the prefabricated panel layer and avoid uneven vertical deformation of a pavement and quick construction caused by load stress concentration, preferably, the prefabricated panel layer comprises at least two steel bar prefabricated plates, and the adjacent steel bar prefabricated plates are connected through wet joints. The prefabricated panel layer with the overlapped wet joints has good integrity and strong deformation resistance, so that the uneven settlement of the roadbed below the semi-rigid base layer or the flexible base layer cannot penetrate through the prefabricated panel layer to act on the surface layer of the pavement, and the quick-hardening UHPC is cast in situ on the wet joints, thereby realizing the rapid construction of the prefabricated panel layer, and the prefabricated panel forms the rigid integral base layer by combining the UHPC wet joints through the overhanging reinforcing steel bars, thereby avoiding the problems of settlement and the like of the flexible pavement caused by the uneven settlement of the soft bases.

In order to facilitate the construction of laying the steel precast slabs in the road grooves, the steel precast slabs are preferably provided with hoisting holes for hoisting.

Further, the action layer is a modified emulsified asphalt permeable sealing layer suitable for semi-rigid base layer pavement or a modified asphalt lower sealing layer suitable for asphalt binder base layer pavement. When the semi-rigid base layer pavement is processed, in order to strengthen the combination between the prefabricated panel layer and the roadbed and block water, preferably, the action layer is a modified emulsified asphalt permeable sealing layer suitable for the semi-rigid base layer pavement; when the asphalt binder base layer pavement is processed, in order to strengthen the combination of the prefabricated panel layer and the pavement, the active layer is a modified asphalt lower sealing layer suitable for the asphalt binder base layer pavement.

In order to strengthen the combination of the prefabricated panel layer and the surface layer, the anti-skid layer is preferably a modified asphalt adhesive layer.

Furthermore, the surface layer comprises two asphalt concrete layers, the lower layer is an SBS modified AC-20 type asphalt concrete layer, and the upper layer is an SBS modified AC-13 type asphalt concrete layer.

Compared with the prior art, the utility model has the advantages that: (1) the road grooves are reasonably excavated in the range of uneven settlement diseases on the soft foundation road section, the construction operation area is reduced to the maximum extent, and compared with a comparison file, the foundation is not required to be reinforced by a jet grouting pile in advance, so that the pavement structure of the utility model is quick in construction, and the construction period is greatly shortened; (2) because the water content of the soft soil in the soft foundation road section is high, the action layer arranged between the prefabricated panel layer and the road groove can strengthen the water resistance and strengthen the interlayer combination; (3) the pavement structure has high bearing capacity, good integrity and strong deformation resistance; (4) the combination between each layer of the pavement structure and between the pavement structure and the roadbed is firm and reliable, and is not easy to damage.

Drawings

FIG. 1 is a schematic plan view of a pavement structure according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of a pavement structure in an embodiment of the utility model;

FIG. 3 is a schematic plan view of a wet seam in an embodiment of the utility model;

FIG. 4 is a schematic cross-sectional view of a wet seam in an embodiment of the utility model.

Detailed Description

The utility model is described in further detail below with reference to the following examples of the drawings.

As shown in FIGS. 1 to 4, the preferred embodiment of the present invention is shown. The pavement structure suitable for uneven settlement diseases of the asphalt pavement of the soft foundation road section comprises a prefabricated panel layer, the prefabricated panel layer is paved in an excavation road groove corresponding to the uneven settlement diseases 5, an action layer 1 used for reinforcing interlayer combination is arranged between the prefabricated panel layer and the road groove, and a surface layer is paved on the prefabricated panel layer. In order to strengthen the combination between the prefabricated panel layer and the roadbed and block moisture when the semi-rigid base layer pavement is processed, the action layer 1 is a modified emulsified asphalt permeable sealing layer; when the asphalt binder type base course pavement is treated, in order to strengthen the combination of the prefabricated panel layer and the roadbed, the action layer 1 is a modified asphalt lower sealing layer. In order to strengthen the combination between the prefabricated panel layer and the surface layer, an antiskid layer 3 capable of avoiding interlayer slippage is arranged between the prefabricated panel layer and the surface layer, the antiskid layer 3 is preferably a modified asphalt adhesive layer, the surface layer can be designed according to the existing technical specification for road asphalt pavement construction (JTG F40), and comprises two asphalt concrete layers, wherein the lower layer is a 6cm SBS modified AC-20 type asphalt concrete layer 41, and the upper layer is a 4cm SBS modified AC-13 type asphalt concrete layer 42.

Meanwhile, in order to improve the load stress diffusion capacity of the prefabricated panel layer and avoid uneven vertical deformation and quick construction of the pavement caused by load stress concentration, the prefabricated panel layer comprises at least two steel bar prefabricated plates 21, the adjacent steel bar prefabricated plates are connected through a wet joint 22 of 10cm, the prefabricated panel layer lapped through the wet joint 22 is good in integrity and strong in deformation resistance, so that the roadbed under a semi-rigid base layer or a flexible base layer is unevenly settled and cannot penetrate through the prefabricated panel layer to the surface layer of the pavement, and the wet joint 22 cast-in-place rapid hardening type UHPC enables the construction of the prefabricated panel layer to be rapid. In order to facilitate the construction of laying the steel prefabricated panels in the corresponding excavated grooves, each steel prefabricated panel 21 is provided with a hoisting hole 211 for hoisting.

The construction method of the pavement structure comprises the following steps:

(1) division of pavement range needing treatment and prefabrication of steel bar prefabricated slab

Dividing the range of the pavement to be treated, drawing the shape and the size of the plate of the steel reinforced precast slab 21 according to the range of the pavement to be treated, and finishing the plate plane layout of the steel reinforced precast slab 21, wherein the plate types are required to be as few as possible, and the prefabrication and the site pavement are convenient;

the steel bar precast slab has the following requirements: the technical standard of the concrete adopted by the steel reinforced precast slabs shall meet the design specifications of reinforced concrete and prestressed concrete bridges and culverts for highways (JTG 3362-; the concrete coarse aggregate should adopt the continuous gradation, the rubble should adopt the broken production of hammering type; the concrete sand can not adopt sea sand and desalinated sea sand; the hot-rolled HPB300 and HRB400 steel bars adopted by the steel bar precast slab respectively conform to the 1 st part of steel for reinforced concrete: hot rolled plain steel (GB/T1499.1-2017), steel for reinforced concrete part 2: hot rolling ribbed steel bars (GB/T1499.2-2018), and when the welded steel needs to meet the weldability requirement, the supplied steel is subjected to material tests according to the specification after entering the field, and the steel can be used when the requirement is met; meanwhile, checking and checking the load fatigue stress, the temperature fatigue stress and the structural limit state of the steel bar precast slab according to the current design specification of the highway concrete pavement according to a stress analysis method of the concrete slab under the asphalt adding layer;

(2) milling and leveling treatment for road groove

Milling a road groove according to a designed elevation, milling the road groove of the semi-rigid base layer road surface by using a milling machine, compacting and leveling by using a road roller after milling, and arranging an action layer 1 such as a modified emulsified asphalt permeable sealing layer on an inorganic binder stable layer of an old road to strengthen waterproof and interlayer bonding; milling the road grooves of the asphalt binder base layer pavement by using a milling machine, blowing dust and removing the dust after milling, and spreading a modified asphalt lower seal layer, so that interlayer bonding is enhanced, and interlayer slippage is avoided;

(3) hoisting and paving of steel bar precast slab 21

Hoisting the steel bar precast slabs 21, paving the steel bar precast slabs into the road channel according to the slab plane layout, and reserving wet joints 22 among the steel bar precast slabs 21;

(4) wet seam 22 lap joint

After the steel prefabricated plates 21 are paved, adopting a quick-hardening UHPC cast-in-place wet joint 22 to lap each steel prefabricated plate; the performance indexes of UHPC concrete are shown in the following table 1;

TABLE 1 UHPC Performance index

(5) Paving antiskid layer 3 and surface layer

After the wet joint 22 is lapped, a modified asphalt bonding layer is firstly sprayed on the steel bar precast slab 21 to serve as an anti-skid layer 3, so that interlayer combination is strengthened, and interlayer slippage is avoided; paving a surface layer, wherein the surface layer sequentially comprises an SBS modified AC-20 type asphalt concrete layer with the thickness of 6cm and an SBS modified AC-13 type asphalt concrete layer with the thickness of 4cm from bottom to top;

the pavement requirements of the surface layer are as follows: the minimum pavement thickness of the expressway and the first-level highway is 10cm, and the minimum pavement thickness of other grades of highways is 8 cm; the composition design of the asphalt concrete mixture of the surface layer is carried out according to the existing technical specification for the construction of the asphalt pavement of roads (JTG F40).

Claims (7)

1. The utility model provides a pavement structure suitable for soft base highway section bituminous paving uneven settlement disease, includes prefabricated panel layer, its characterized in that: the prefabricated panel layer is paved in an excavated road groove corresponding to the uneven settlement diseases (5), an action layer (1) used for combining the prefabricated panel layer and the road groove is arranged between the prefabricated panel layer and the road groove, and a surface layer is paved on the prefabricated panel layer.

2. The pavement structure suitable for the uneven settlement disease of the asphalt pavement of the soft foundation section as claimed in claim 1, wherein: an anti-slip layer (3) capable of avoiding interlayer slippage is arranged between the prefabricated panel layer and the surface layer.

3. The pavement structure suitable for the uneven settlement disease of the asphalt pavement of the soft foundation section as claimed in claim 2, wherein: the prefabricated panel layer comprises at least two steel bar prefabricated plates (21), and adjacent steel bar prefabricated plates (21) are connected through wet joints (22).

4. The pavement structure suitable for the uneven settlement disease of the asphalt pavement of the soft foundation section as claimed in claim 3, wherein: and hoisting holes (211) for hoisting are formed in the steel bar precast slabs (21).

5. The pavement structure suitable for the uneven settlement disease of the asphalt pavement of the soft foundation section as claimed in claim 4, wherein: the action layer (1) is a modified emulsified asphalt permeable sealing layer suitable for semi-rigid base layer pavements or a modified asphalt lower sealing layer suitable for asphalt binder base layer pavements.

6. The pavement structure suitable for the differential settlement diseases of the asphalt pavement of the soft foundation section as claimed in claim 4 or 5, wherein: the anti-skid layer (3) is a modified asphalt adhesive layer.

7. The pavement structure suitable for the uneven settlement disease of the asphalt pavement of the soft foundation section as claimed in claim 6, wherein: the surface layer comprises two asphalt concrete layers, the lower layer is an SBS modified AC-20 type asphalt concrete layer (41), and the upper layer is an SBS modified AC-13 type asphalt concrete layer (42).

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