CN211772517U

CN211772517U - Asphalt road paving base block and asphalt road structure

Info

Publication number: CN211772517U
Application number: CN202020255069.XU
Authority: CN
Inventors: 姚彬; 蔡强; 钟明续
Original assignee: China 22MCC Group Corp Ltd
Current assignee: China 22MCC Group Corp Ltd
Priority date: 2020-03-04
Filing date: 2020-03-04
Publication date: 2020-10-27
Anticipated expiration: 2030-03-04

Abstract

The utility model provides an asphalt road paving base block, which is a precast concrete block with the thickness equal to the thickness of a road designed water stabilization layer; the left side surface and the right side surface of the base block are tangent planes inclined towards the middle of the base block, the upper part of each tangent plane is provided with a bevel angle, and the lower part of each tangent plane is provided with a groove; the front side face and the rear side face of the base block are tangent planes inclined towards the outer side of the base block, and the upper part of each tangent plane is provided with a bevel angle. Still provide an asphalt road structure, including the basic unit, the water is steady layer and pitch surface course, the water is steady layer and is become by geogrid and prefabricated concrete base block group, the base block is with X axial, Y axial, X axial crisscross laying in geogrid surface, establish the expansion joint between the base block, base block bottom edge sets up triangular groove, the netted expansion joint of triangular groove constitution, netted expansion joint is filled with concrete grout material, the prefabricated base block compactness of this scheme is high, the base block is under the road surface course, the difference in temperature influence is little, reducible crack and the reflection crack that produce because of shrinkage, the temperature shrinkage, guarantee road quality, still accelerate construction speed.

Description

Asphalt road paving base block and asphalt road structure

Technical Field

The utility model belongs to the technical field of the town road, concretely relates to base block and pitch road structure are laid to road.

Background

The asphalt pavement is a high-grade pavement which is most widely adopted in road construction, and the asphalt binder improves the capability of the paving aggregate for resisting driving and damages of natural factors to the pavement, so that the pavement is smooth, less in dust and durable. The construction method of the existing road comprises the following steps: 1) after the base layer is processed, stacking various graded materials according to the mixing proportion; 2) stirring until the mixture is uniform, and adjusting the graded water content of the cement and the stone at any time according to the requirement in the process; 3) after the materials are stirred, the materials are transported to the site for paving, compacted by a road roller, assisted by manual finishing, and subjected to height compensation for at least three times; 4) and (5) sprinkling water to the concrete layer for maintenance so as to enable the water-stable layer to reach the maximum dry density. 5) And (3) paving a layer of the concrete material on the first water stable layer which is well maintained, finishing rolling and performing water spraying maintenance for one period again after the compaction degree is checked to be qualified. 6) And paving an asphalt surface layer on the water-stable layer.

The water stabilization layer is particularly important in road engineering construction. Usually, mix proportion trial-matching is carried out in a laboratory according to the characteristics of engineering per se so as to determine the cement mixing amount and the coarse-fine aggregate proportion and simultaneously determine the maximum dry density. The method of stabilizing the water layer twice is adopted for the road base layer in the traditional process, under the condition of the same amount of water, the construction of the water layer for one time takes about 7 days, and the construction of the water layer for two times takes 14 days, so that the construction period of most of the time is occupied.

Disclosure of Invention

The utility model discloses aim at improving bituminous paving's construction speed, mainly shorten the engineering time of road bed.

In order to achieve the above purpose, the solution provided by the invention is as follows:

the invention provides an asphalt road paving base block, which is a precast concrete block with the thickness equal to the thickness of a road designed water stabilization layer, and the length and the width of the base block are 1015 multiplied by 995 mm; the left side surface and the right side surface of the base block are tangent planes inclined towards the middle of the base block, the upper part of each tangent plane is provided with a bevel angle, and the lower part of each tangent plane is provided with a groove; the front side face and the rear side face of the base block are tangent planes inclined towards the outer side of the base block, and the upper part of each tangent plane is provided with a bevel angle.

The prefabricated base block is mechanically and numerically controlled maintained in a factory to reach the designed strength, the compactness is higher, the standardized control of the prefabricated base block uses a shaping steel die, and the standardized control of the prefabricated base block is well ensured.

The asphalt road structure comprises a base layer, a water-stable layer and an asphalt surface layer, wherein the base layer comprises a soil base layer, a hill-skin stone cushion layer and a gravel leveling layer; the water stabilization layer consists of geogrids and prefabricated concrete base blocks, the base blocks are alternately paved on the surfaces of the geogrids in an X axial direction, a Y axial direction and an X axial direction, expansion joints are arranged among the base blocks, triangular grooves are arranged on the edges of the bottoms of the base blocks, the triangular grooves form netted expansion joints, and the netted expansion joints are filled with concrete grouting materials; the asphalt surface layer is formed by overlaying and paving a petroleum asphalt sticky layer and a medium-particle asphalt layer which are sprayed on the surface of the base block.

The base layer in the road structure is formed by combining a plurality of base blocks, the base blocks are subjected to dry shrinkage deformation when being assembled, the size of slurry filled in gaps of the base blocks is small, the influence after the dry shrinkage is small, and the influence of temperature difference is small because the base blocks are arranged below a road surface layer, so that cracks and reflection cracks caused by the dry shrinkage and the temperature shrinkage can be reduced.

The road construction method provided by the invention has the advantages that the precast block is paved to replace concrete cast-in-place construction of the water stabilization layer of the road, the maintenance time is reduced, the construction time of the water stabilization layer is shortened from the original 7 days to 1-2 days, the middle time is shortened by 12 days, and the construction period is extremely favorable for rush repair and construction shortening of urban main roads.

Drawings

FIG. 1 is a front shape view of a base block;

FIG. 2 is a side view of the base block;

FIG. 3 is a road block diagram of the present invention;

fig. 4 is a view showing a road surface structure after the base block is laid.

In the figure: the asphalt pavement comprises a base layer 1, a water stabilization layer 2, an asphalt surface layer 3, a foundation block 4, an oblique angle 5, a groove 6 and an expansion joint 7.

Detailed Description

The technical scheme of the invention is explained in detail with reference to the accompanying drawings, as shown in fig. 1 and 2, the invention firstly provides an asphalt road paving base block, the base block is a precast concrete block with the thickness equal to the thickness of a designed water stabilization layer of a road, and the length and the width of the base block are 1015 multiplied by 995 mm; the left side surface and the right side surface of the base block are tangent planes inclined towards the middle of the base block, the upper part of each tangent plane is provided with a bevel angle 5, and the lower part of each tangent plane is provided with a groove 6; the front side face and the rear side face of the base block are tangent planes inclined towards the outer side of the base block, and the upper part of each tangent plane is provided with a bevel angle 5.

The asphalt road paving base block is used for road water stabilization layer construction, can be mechanically and numerically controlled maintained in a factory to well achieve the design strength, has higher compactness, and is directly paved on a road after the precast blocks are intensively transported to a road construction site. This prefabricated base block standardized control can use the design steel mould, the standardized control of fine assurance prefabricated base block.

The groove at the lower part of the base block can be one layer or a plurality of layers, and is used for containing concrete slurry to realize the adhesion between the base block and the base block.

Based on the application of the prefabricated base block, the invention provides an asphalt road structure which comprises a base layer 1, a water stabilization layer 2 and an asphalt surface layer 3, wherein the soil base layer 1 comprises a soil base layer, a hill-skin stone cushion layer and a gravel leveling layer; the water stabilization layer 2 consists of geogrids and prefabricated concrete base blocks 4 laid in rows according to a certain rule, the base blocks 4 are alternately laid on the surfaces of the geogrids in the X axial direction, the Y axial direction and the X axial direction, expansion joints 7 are arranged among the base blocks 4, triangular grooves 6 are arranged at the bottom edges of the base blocks 4, the triangular grooves 6 form mesh expansion joints 7, and the mesh expansion joints 7 are filled with concrete grouting materials; the asphalt surface layer is formed by overlaying and paving a petroleum asphalt sticky layer and a medium-particle asphalt layer which are sprayed on the surface of the base block.

The road structure cement stabilized layer is formed by directly laying foundation blocks, a small amount of concrete grouting materials are poured on site, the maintenance time for waiting concrete drying is greatly reduced compared with the time for cast-in-place maintenance of cement stabilized layer integral concrete in the prior art, and great help is provided for accelerating the construction speed. The concrete cast in situ between the base blocks is filled in a groove designed at the bottom of the base block, a reticular boss is formed at the bottom of the base block layer, and the bottom is wrapped by combining the two-way tension geogrid composite surface at the bottom layer of the base block, so that a multiple redundancy stabilizing system is established.

The precast concrete water stable layer stabilizing measures and principles are as follows:

the precast concrete foundation blocks 4 are specifically arranged as shown in fig. 4, and are staggered in the positive and negative directions according to X, Y axis, after arrangement, concrete filling holes are formed at the edges of the foundation blocks 4 due to the length and width difference of the foundation blocks, and after the concrete grouting material is grouted, the concrete grouting material reaches the grooves 6 at the bottom of the foundation blocks 4.

The invention designs a three-way embedding and extruding stable water stabilizing layer, establishes mutual embedding and extruding of the base blocks in X, Y, Z three directions, has good load diffusion effect, increases the stress area of the water stabilizing layer, and avoids the sinking of a single base block. The water stabilization layer is formed by laying a base block, the base block is subjected to dry shrinkage deformation during assembly, the size of slurry poured into a gap of the base block is small, and the influence after dry shrinkage is small. Because the base block is arranged below the road surface layer, the influence of temperature difference is small, and cracks and reflection cracks generated by dry shrinkage and temperature shrinkage can be reduced.

The invention reasonably designs the gaps, disperses the gaps, avoids large deformation of a single gap through micro deformation of each gap, reduces the stress concentration phenomenon, is more suitable for northern roads, and effectively avoids road grout turning. The edge of the foundation block is provided with a triangular groove area, concrete grouting material is filled in the triangular groove area, the self-adaptive characteristic of the material is fully utilized, the crack development route is blocked, and the occurrence of reflection cracks is avoided. Set up multiple redundant stable system, for the stability that improves the water stabilization layer, set up horizontal slot, perpendicular groove in the base block side, set up square grid form boss in the base block bottom surface, combine techniques such as the comprehensive parcel of two-way pulling force geogrid to establish multiple redundant stable system.

The construction method of the asphalt road comprises the following steps:

1) grooving a road soil base layer, compacting the soil base, paving a mountain skin stone cushion layer on the surface, and then leveling by using broken stones;

2) rolling and leveling the laid soil base layer;

3) laying a fixed soil grid;

4) calculating the section area according to the road width, calibrating the unloading section distance of the base blocks, and stacking the base blocks with the required number in one section;

5) paving the base blocks on a road in an X-axial direction, a Y-axial direction and an X-axial direction in a staggered manner, wherein a 3-millimeter interval is reserved between adjacent base blocks, and triangular grooves at the bottoms of the base blocks are interconnected to form a reticular expansion joint;

6) building long vertical kerbs, and sealing edges of two sides of a road with concrete;

7) filling concrete grouting materials into the reticular expansion joints among the foundation blocks;

8) spraying a petroleum asphalt sticky layer and a medium-particle asphalt layer on the surface of the base block;

9) and spraying a petroleum asphalt sticky layer and a medium asphalt layer on the medium asphalt layer obtained in the step 8.

After construction according to the method, according to the comparison of engineering effects, the quality guarantee rate of the prefabricated base blocks is high, so that the bearing capacity of the road is guaranteed, and the maintenance cost of the whole service life of the road is greatly reduced. The construction road occupation time is reduced, the traditional road construction generally needs 45-60 days, and the 1/3 time of the construction period of the traditional process is only used by adopting the technology.

The invention has the beneficial effects that: 1. by shortening the construction period of the water stabilization layer and reducing the construction occupying time, the gradual completion is really realized, and the traffic is opened as soon as possible. 2. The water stabilization layer quality is guaranteed, the service life of the road is prolonged, the annual maintenance road area of the municipal road is reduced, the road rebuilding period is prolonged, and the maintenance cost of the whole life of the road is substantially reduced. 3. The road construction season can be prolonged, and the road construction requirements in early spring, early winter and plum rain seasons are met. 4. The prefabricated assembly type base block adopts a factory production mode, so that construction waste on a construction site is greatly reduced, and the prefabricated assembly type base block is more environment-friendly.

Claims

1. An asphalt road paving base block is characterized in that: the base block is a precast concrete block with the thickness equal to the thickness of a designed water stabilization layer of a road, and the length and the width of the base block are 1015 multiplied by 995 mm; the left side surface and the right side surface of the base block (4) are tangent planes inclined towards the middle of the base block, the upper part of each tangent plane is provided with a bevel angle (5), and the lower part of each tangent plane is provided with a groove (6); the front side face and the rear side face of the base block are tangent planes inclined towards the outer side of the base block (4), and the upper part of each tangent plane is provided with a bevel angle (5).

2. The utility model provides an asphalt road structure, includes basic unit (1), water stable layer (2) and pitch surface course (3), characterized by: the base layer (1) comprises a soil base layer, a hill-stone cushion layer and a gravel leveling layer; the water stabilization layer (2) consists of geogrids and prefabricated concrete base blocks (4), the base blocks (4) are alternately laid on the surfaces of the geogrids in the X axial direction, the Y axial direction and the X axial direction, expansion joints (7) are arranged among the base blocks, triangular grooves (6) are arranged on the edges of the bottoms of the base blocks, the triangular grooves (6) form netted expansion joints (7), and the netted expansion joints are filled with concrete grouting materials; the asphalt surface layer is formed by overlaying and paving a petroleum asphalt sticky layer and a medium-particle asphalt layer which are sprayed on the surface of the base block (4).