CN219621517U - Cement concrete pavement structure - Google Patents

Abstract

The utility model discloses a cement concrete pavement structure, which is applied to a traveling road and relates to the technical field of road construction, wherein the cement concrete pavement structure comprises: the subbase layer is paved by graded steel slag; the middle base layer is formed by paving cement stable steel slag; the sand cushion is formed by laying sand grains; the surface layer is paved by cement concrete; the subgrade layer is paved on the roadbed, the middle base layer is paved on the subgrade layer, the sand cushion layer is paved on the middle base layer, and the surface layer is paved on the sand cushion layer. The cement concrete pavement structure provided by the utility model can improve the pavement structural strength, treat waste steel slag in an environment-friendly way and improve the resource utilization rate.

Description

Cement concrete pavement structure

Technical Field

The utility model relates to the technical field of road construction, in particular to a cement concrete pavement structure utilizing steel slag.

Background

At present, cement concrete pavement is mostly adopted for plant and mine roads, and the plant and mine roads have the advantages of high rigidity, high bearing capacity, long fatigue life, low manufacturing cost and the like compared with asphalt pavement. Along with technological progress, the traffic vehicle load of factory and mine is increasing, and the frequency that the road surface crossed the traffic vehicle increases simultaneously, and the road surface of current structure can't satisfy the bearing requirement, and the road surface damages more and more seriously, seriously influences factory transportation ability, and the factory and mine is urgently needed a road surface structure that bearing capacity is strong.

Meanwhile, a large amount of waste steel slag is generated in the process of producing steel in the steel plant, the existing utilization rate of the waste steel slag occupying a large amount of space in the plant is low, and secondary utilization treatment is also urgently needed for the waste steel slag in the plant.

Disclosure of Invention

The utility model aims to provide a cement concrete pavement to solve the problems of insufficient pavement bearing and steel slag accumulation in factories in the prior art.

In order to solve the technical problems, the utility model adopts the following technical scheme:

a cement concrete pavement structure comprising:

the subbase layer is paved by graded steel slag;

the middle base layer is formed by paving cement stable steel slag;

the sand cushion is formed by laying sand grains;

the surface layer is paved by cement concrete;

the subgrade layer is paved on the roadbed, the middle base layer is paved on the subgrade layer, the sand cushion layer is paved on the middle base layer, and the surface layer is paved on the sand cushion layer.

In an alternative embodiment of the utility model, the grain content of the graded steel slag of the base layer is less than or equal to 5% and the grain diameter of the graded steel slag of the base layer is less than or equal to 31.5mm, the thickness of the graded steel slag of the base layer is 30-40 cm, the compactness is more than or equal to 0.97, and the unconfined compressive strength base layer of 7d is more than or equal to 2.5MPa.

In an alternative embodiment of the utility model, the subbing layer comprises a plurality of subbing layers, the subbing layers having a thickness of 20cm or less.

In an alternative embodiment of the utility model, the cement content of the cement stabilized slag of the middle base layer is 3% -5.5%, the particle diameter of the cement stabilized slag is less than 31.5mm, and the particle content of the cement stabilized slag of the middle base layer is less than or equal to 2% and less than 0.075%.

In an alternative embodiment of the utility model, the cement stabilized slag forms a preliminary middle base layer after the initial setting time, the preliminary middle base layer forms a middle base layer after the final setting time, the compaction degree of the middle base layer is more than or equal to 0.98, and the unconfined compressive strength base layer of 7d is more than or equal to 4MPa.

In an alternative embodiment of the present utility model, the middle base layer includes an upper base layer and a lower base layer, the cement content of the upper base layer is 4.5% -5.5%, the cement content of the lower base layer is 3% -4%, and the thickness range of the upper base layer and the lower base layer is 16-20 cm.

In an alternative embodiment of the utility model, the thickness of the sand cushion ranges from 2 cm to 3cm, the grain size of the sand cushion is less than 10mm, and the content of the sand cushion with the grain size of > 2mm is more than 55%.

In an alternative embodiment of the utility model, the thickness of the surface layer is 25-35 cm, the cement concrete of the surface layer comprises coarse aggregate, fine aggregate and cement, the coarse aggregate is broken stone or pebble, the mud content of the coarse aggregate is less than or equal to 2%, the water absorption rate is less than or equal to 3%, the los Angeles abrasion loss is less than or equal to 35%, the fine aggregate is natural sand or machine-made sand, the mud content of the fine aggregate is less than or equal to 3%, the water absorption rate is less than or equal to 2%, and the chloride ion content is less than or equal to 0.06%.

In an alternative embodiment of the utility model, the cement concrete pavement structure further comprises:

the curb layer is made of cement concrete standing stones, is arranged on two sides of the surface layer and is higher than the surface layer;

the curb backrest is made of cement concrete and is provided with a containing groove for containing a curb layer, the curb layer is arranged in the containing groove, and the curb backrest is connected with the middle base layer.

In an alternative embodiment of the utility model, the accommodating groove comprises a groove bottom and a groove back, the curb layer is connected with the groove back, the curb layer and the groove bottom are provided with a mortar cushion layer, and the mortar cushion layer is made of cement mortar.

The cement concrete pavement structure disclosed by the utility model has the beneficial effects that: the cement concrete is adopted to lay the surface layer, so that the bearing capacity and the service life of the surface layer are improved. The sand cushion layer paved by sand grains is arranged between the surface layer and the middle base layer, so that the load transmission effect between the surface layer and the middle base layer can be buffered, the stress between the surface layer and the middle base layer is uniform, and the surface layer is effectively prevented from being broken. The subbase layer paved by the graded steel slag plays a role in avoiding the groundwater from corroding the middle base layer to reduce the performance of the middle base layer, plays a role in stress buffering between the middle base layer and the ground roadbed, avoids the middle base layer from reflecting to the surface layer due to cracks, and improves the overall durability. The middle base layer is paved by cement stabilized slag, the middle base layer forms a semi-rigid structure, the cement stabilized slag replaces the traditional cement stabilized macadam, the exploitation and the utilization of natural nonrenewable stone are reduced, the utilization rate of waste slag is improved, the effects of saving materials and treating the waste slag in an environment-friendly way are achieved, in the aspect of mechanical properties, the molding strength of the cement stabilized slag is higher than that of the cement stabilized macadam, the bonding performance is better, and the overall bearing capacity and durability can be greatly improved. Through the structure of subbase layer, well basic unit, sand bed course and surface course, has greatly promoted holistic bearing capacity and durability to replace traditional cement stabilized macadam through cement stabilized slag and laid well basic unit, rationally and the environmental protection has utilized old and useless slag, has avoided the pollution of old and useless slag to the environment, has promoted resource utilization.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural view of a cement concrete pavement structure according to the present utility model.

Reference numerals: 10. a base layer; 20. a middle base layer; 21. a lower base layer; 22. an upper base layer; 30. a sand cushion layer; 40. a surface layer; 50. a curb layer; 60. a curb backrest; 61. a receiving groove; 611. a groove bottom; 612. a slot back; 70. a mortar cushion layer; 80. ground roadbed.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

The terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", or a third "may explicitly or implicitly include one or more such feature.

In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments may be embodied in many forms and should not be construed as limited to the examples set forth herein; rather, these example embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus a repetitive description thereof will be omitted.

The preferred embodiments of the present disclosure are further elaborated below in conjunction with fig. 1 of the present specification.

Referring to fig. 1, an embodiment of the present utility model provides a cement concrete pavement structure, which can be applied to pavement transportation in a steel plant area. Through the setting of subbase 10, well basic unit 20, sand bed course 30 and surface course 40, subbase 10 plays the effect of separation groundwater infiltration, well basic unit 20 plays main bearing action to well basic unit 20 utilizes cement stable slag to replace cement stable rubble, when carrying out environmental protection to old and useless slag and handling, practiced thrift the use amount of non-renewable resource rubble, promote resource utilization and environmental protection performance, sand bed course 30 plays the load-carrying effect between buffering surface course 40 and the well basic unit 20, and make atress between surface course 40 and the well basic unit 20 even, effectively avoid surface course 40 fracture, greatly promoted holistic bearing capacity and durability.

In an embodiment of the present utility model, a cement concrete pavement structure includes:

the subbase layer 10 is paved by graded steel slag;

the middle base layer 20 is paved by cement stable steel slag;

a sand cushion 30 paved by sand grains;

a facing layer 40 laid out of cement concrete;

the subbase layer 10, the middle base layer 20, the sand cushion 30 and the surface layer 40 are paved from bottom to top, the subbase layer 10 is paved on the roadbed, the middle base layer 20 is paved on the subbase layer 10, the sand cushion 30 is paved on the middle base layer 20, and the surface layer 40 is paved on the sand cushion 30.

The base course 10 separates groundwater erosion and goes out basic unit 20, guarantee the stability of well basic unit 20 that is used for bearing, well basic unit 20 replaces cement stabilized macadam through cement stabilized slag, effectively promote the stability of well basic unit 20, cohesiveness and bearing capacity, the fine effect that plays the buffer load of sand bed course 30, atress equipartition, and the fracture of well basic unit 20 can not upwards conduct to surface course 40 through sand bed course 30, sand bed course 30 plays the effect of protection surface course 40, surface course 40 adopts cement concrete to lay, the bearing capacity and the life of surface course 40 have been improved, through the interact between each layer, holistic bearing capacity and durability have effectively been promoted.

The grain content of the graded steel slag of the base layer 10 is less than or equal to 5 percent, the grain diameter of the graded steel slag of the base layer 10 is less than 31.5mm, the thickness is 30-40 cm, and the 7d unconfined compressive strength base layer is more than or equal to 2.5MPa. The graded steel slag adopts a heavy compaction standard design, the compactness is more than or equal to 0.97%, and the CBR value is more than or equal to 80%. The grading ranges of the grading steel slag mixture used for the subbase 10 are shown in table 1,

TABLE 1 Graded Range of Graded slag mixtures for the underlayment

The subbase layer 10 is paved by the graded steel slag and is used for preventing the groundwater of the ground roadbed 80 from penetrating upwards to the middle base layer 20, so that the performance stability of the cement stable steel slag of the middle base layer 20 is ensured. The subbase layer 10 also replaces broken stone by the graded steel slag, effectively utilizes the waste steel slag, improves the utilization rate of resources of the waste steel slag and achieves the effect of environmental protection treatment.

The subbing layer 10 comprises a plurality of subbing layers, and the thickness of the subbing layers is less than or equal to 20cm. The subbase layer 10 is compacted in a layering manner through subbase layering, so that the compactness of the subbase layer 10 is stronger, and the performance stability of the subbase layer 10 grade steel slag is improved.

The cement content of the cement stabilized slag of the middle base layer 20 is 3% -5.5%, the particle diameter of the cement stabilized slag is less than 31.5mm, and the particle content of the cement stabilized slag of the middle base layer 20, which is less than 0.075, is less than or equal to 2%. The cement content of the cement stabilized slag of the middle base layer 20 is 3% -5.5%, the cohesiveness skill among the cement stabilized slag is guaranteed, the particle diameter of the cement stabilized slag is in a set range, the cement stabilized slag is guaranteed to have good fluidity when being paved to form the middle base layer 20, and the smoothness after paving and compacting is improved.

The cement stable steel slag forms a preliminary middle base layer after the initial setting time, the preliminary middle base layer forms a middle base layer 20 after the final setting time, the compactness of the middle base layer 20 is more than or equal to 0.98, and the unconfined compressive strength base layer of 7d is more than or equal to 4MPa. The initial setting time is set to be 3-5 h, the cement stabilized slag forms a preliminary middle base layer after 3-5 h, the preliminary middle base layer has a certain hardness, but the cement is not completely solidified, the cement stabilized slag also has a certain fluidity, and the preliminary middle base layer is easy to deform under the heavy pressure state. The initial setting final setting time is 6-10 h, at this time, the cement is completely set, the cement stabilized steel slag has no fluidity, and the hardness reaches the maximum. The cement stable steel slag is subjected to initial setting and then final setting, so that the formed middle base layer 20 is higher in overall hardness and higher in stability.

The middle base layer 20 comprises an upper base layer 22 and a lower base layer 21, wherein the cement content of the upper base layer 22 is 4.5-5.5%, the cement content of the lower base layer 21 is 3-4%, and the thickness range of the upper base layer 22 and the lower base layer 21 is 16-20 cm. The thickness of the upper base layer 22 is 16-20 cm, and the thickness of the lower base layer 21 is 16-20 cm. The middle base layer 20 is layered through the upper base layer 22 and the lower base layer 21, so that the compaction strength of the middle base layer 20 paved when the thickness of the middle base layer 20 is large is effectively improved, and the overall strength of the middle base layer 20 is improved. The cement content of the upper base layer 22 is high, the solidification is high, the cracking resistance is high, the upper base layer 22 is prevented from being broken, the upper base layer 22 is prevented from being conducted to the surface layer 40, and the overall durability is improved.

The cement stabilized slag composition of the upper base layer 22 is shown in table 2,

table 2 cement stabilized slag grading table of the upper base layer

The cement stabilized slag composition of the lower base layer 21 is shown in table 3:

table 3 cement stabilized slag grading table of lower base

The cement stabilized slag compositions of the upper base layer 22 and the lower base layer 21 are the same, so that the upper base layer 22 and the lower base layer 21 have good cohesiveness, and the strength of the middle base layer 20 formed by the upper base layer 22 and the lower base layer 21 is enhanced.

The thickness range of the sand cushion 30 is 2-3 cm, the grain size of sand grains of the sand cushion 30 is smaller than 10mm, the content of the sand grains of the sand cushion 30 which are larger than 2mm is larger than 55%, the grain size of the sand grains is small and average, the fluidity of the sand cushion 30 is improved, the thickness of the sand cushion 30 is 2-3 cm, and on the premise of guaranteeing the buffering effect of the sand cushion 30, the integral stability weakening caused by the excessive thickness of the sand cushion 30 is avoided. The sand particles have a mud content of less than 4% and the mud can impede the flow of sand particles, and the low mud content can ensure the mobility of the sand bed 30, thereby improving the force uniformity of uniformly distributing the load of the face layer 40 to the midsole layer 20.

The thickness of the surface layer 40 is 25-35 cm, the cement concrete of the surface layer 40 comprises coarse aggregates, fine aggregates and cement, wherein the coarse aggregates are gravels or pebbles, the mud content of the coarse aggregates is less than or equal to 2%, the water absorption rate is less than or equal to 3%, the los Angeles abrasion loss is less than or equal to 35%, the fine aggregates are natural sand or machine-made sand, the mud content of the fine aggregates is less than or equal to 3%, the water absorption rate is less than or equal to 2%, and the chloride ion content is less than or equal to 0.06%. The surface layer 40 is used as a structure contacting a carried object, and needs to have stable carrying performance, the surface layer 40 is formed by mixing primary aggregate, fine aggregate and cement, and the fluidity during paving is ensured, so that good flatness is ensured after paving is completed, and the strength of the surface layer 40 is improved.

The cement concrete pavement structure further comprises:

the curb layer 50 is made of cement concrete standing stones, the strength grade is more than or equal to C40, the height of the curb layer 50 higher than that of the surface layer 40 is 5-15 cm, the curb layer 50 is arranged on two sides of the surface layer 40 and higher than the surface layer 40, the curb layer 50 plays a role in protecting the surface layer 40, and the problem that the side surface of the surface layer 40 is directly exposed to cause side surface cracking of the surface layer 40 to influence the integral strength of the surface layer 40 is avoided. Meanwhile, the curb layer 50 is higher than the surface layer 40, so that the curb layer can also prevent roadside sand and stone from invading the surface layer 40 in a large area, the cleanliness of the surface layer 40 is improved, and the influence of sharp sand and stone on the strength of the surface layer 40 caused by damage to the surface layer 40 can be avoided.

The curb backrest 60 is made of cement concrete, the strength grade is equal to or greater than C25, the storage groove 61 for storing the curb layer 50 is formed, the curb layer 50 is arranged in the storage groove 61, the curb backrest 60 is connected with the middle base layer 20, the curb backrest 60 plays a supporting role on the curb layer 50, the curb layer 50 is abutted against the side edge of the surface layer 40, and the stability of the curb layer 50 is improved.

The accommodating groove 61 comprises a groove bottom 611 and a groove back 612, the curb layer 50 is connected with the groove back 612, the curb layer 50 and the groove bottom 611 are provided with a mortar cushion layer 70, the mortar cushion layer 70 is made of cement mortar, and the groove bottom 611 of the accommodating groove 61 of the curb backrest 60 is connected with the curb layer 50 through the mortar cushion layer 70, so that the fixing firmness of the curb layer 50 is enhanced. The thickness of the mortar cushion layer 70 is 2-3 cm, the mass ratio of cement to sand is 1:3, the part with the grain diameter smaller than 2mm is larger than 45%, and the mud content is less than or equal to 4%.

The construction process of the cement concrete pavement structure is as follows:

and S10, building a test section to determine construction parameters such as the paving thickness, the compaction pass number, the sedimentation difference and the like of the ground roadbed 80, the subbase layer 10 and the middle base layer 20.

And S20, layering and rolling the bottom surface by adopting a vibratory roller to form a ground roadbed 80 so as to achieve the required compactness and rebound modulus.

S30, layering and rolling the graded steel slag to form a subbase layer 10, so that the compactness of each layer is more than 0.97, and the compaction operation is light before heavy, slow before fast, edge before middle, and the ultra-high section of the ramp and the curve needs to be from the inner side to the outer side, and low before high. The tracks of two adjacent compaction steps should overlap 1/3 of the wheel width, so as to keep uniform compaction and prevent leakage, and the corners which cannot be compacted should be tamped by manpower or a small machine.

S40, carrying out layered paving and rolling on the mud stabilization steel slag to form the middle base layer 20, wherein the degree of solidity of each layer is more than 0.98, and the middle base layer 20 needs to be maintained after the primary setting time and the primary setting final setting time.

S50, uniformly spreading 2-3 cm sand grains to form the sand cushion 30 after the middle base layer 20 is cured.

S60, layering and rolling cement concrete to form a surface layer 40, adding transverse seams, longitudinal seams and construction seams to increase the surface friction force of the surface layer 40, setting the transverse seam spacing to be 4-6 m, the joint filling width to be 3-8 m and the depth to be 10-12 mm, setting a pull rod according to the standard requirement, setting the aspect ratio value of the surface layer 40 to be not more than 1.35, setting the plane area to be not more than 25m < 2 >, setting the longitudinal seam spacing to be 3-4.5 m, the joint filling width to be 3-8 m and the depth to be 6-7.5 mm, and setting the pull rod according to the standard requirement.

S70, after the curing strength of the cement concrete surface layer 40 meets the requirement, arranging the curb backrest 60 on two sides of a road, arranging the accommodating groove 61, paving the mortar cushion layer 70 with the thickness of 2-3 cm on the groove bottom 611 of the accommodating groove 61, constructing and fixing the curb on the accommodating groove 61 to form the curb layer 50, wherein the curb roof line is smooth, gaps among the curbs are uniform, compact and flat, and the top surface of the curb is smooth and straight and meets the height requirement.

In combination, the cement concrete is adopted to lay the surface layer 40, so that the bearing capacity and the service life of the surface layer 40 are improved. The sand cushion layer 30 paved by sand grains is arranged between the surface layer 40 and the middle base layer 20, so that the load transmission effect between the surface layer 40 and the middle base layer 20 can be buffered, the surface layer 40 and the middle base layer 20 are uniformly stressed, and the surface layer 40 is effectively prevented from being broken. The subbase layer 10 paved by the graded steel slag plays a role in avoiding the groundwater from corroding the middle base layer 20 to reduce the performance of the middle base layer 20, plays a role in stress buffering between the middle base layer 20 and the ground roadbed 80, avoids the middle base layer 20 from generating cracks and reflecting to the surface layer 40, and improves the overall durability. The middle base layer 20 is paved by cement stabilized slag, the middle base layer 20 forms a semi-rigid structure, the cement stabilized slag replaces the traditional cement stabilized macadam, so that the exploitation and utilization of natural nonrenewable stone are reduced, the utilization rate of waste slag is improved, the effects of saving materials and treating the waste slag in an environment-friendly way are achieved, in the aspect of mechanical properties, the molding strength of the cement stabilized slag is higher than that of the cement stabilized macadam, the bonding performance is better, and the overall bearing capacity and durability can be greatly improved. Through the structure of the subbase layer 10, the middle base layer 20, the sand cushion 30 and the surface layer 40, the overall bearing capacity and durability are greatly improved, and the cement stabilized slag is used for replacing the traditional cement stabilized macadam paving middle base layer 20, so that the waste slag is reasonably and environmentally friendly utilized, the pollution of the waste slag to the environment is avoided, and the resource utilization rate is improved.

In the description of the above embodiments, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

While the present disclosure has been described with reference to several exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration rather than of limitation. As the present disclosure may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.

Claims (10)

1. A cement concrete pavement structure, comprising:

the subbase layer is paved by graded steel slag;

the middle base layer is formed by paving cement stable steel slag;

the sand cushion is formed by laying sand grains;

the surface layer is paved by cement concrete;

the subgrade layer is paved on the roadbed, the middle base layer is paved on the subgrade layer, the sand cushion layer is paved on the middle base layer, and the surface layer is paved on the sand cushion layer.

2. The cement concrete pavement structure according to claim 1, wherein the grain diameter of the graded steel slag of the subbase layer is less than 31.5mm, the thickness is 30-40 cm, the compactness is more than or equal to 0.97, and the 7d unconfined compressive strength base layer is more than or equal to 2.5MPa.

3. A cement concrete pavement structure according to claim 2, wherein said underlayment comprises a plurality of underlayments, said underlayments having a thickness of 20cm or less.

4. A cement concrete pavement structure according to claim 1, wherein the particle diameter of the cement stabilized slag of the midsole layer is < 31.5mm.

5. The cement concrete pavement structure according to claim 4, wherein the cement stabilized slag forms a preliminary middle base layer after an initial setting time, the preliminary middle base layer forms a middle base layer after an initial setting time, the compaction degree of the middle base layer is more than or equal to 0.98, and the unconfined compressive strength base layer of 7d is more than or equal to 4MPa.

6. A cement concrete pavement structure according to claim 5, wherein said middle base layer comprises an upper base layer and a lower base layer, said upper and lower base layers having a thickness in the range of 16-20 cm.

7. A cement concrete pavement structure according to claim 1, wherein the thickness of the sand bedding layer is in the range of 2-3 cm, and the grain size of the sand bedding layer is less than 10mm.

8. The cement concrete pavement structure according to claim 1, wherein the thickness of the surface layer is 25-35 cm, the cement concrete of the surface layer comprises coarse aggregate, fine aggregate and cement, the coarse aggregate is broken stone or pebble, the los Angeles abrasion loss of the coarse aggregate is less than or equal to 35%, and the fine aggregate is natural sand or machine-made sand.

9. A cement concrete pavement structure according to any one of claims 1-8, further comprising:

the curb layer is made of cement concrete standing stones, is arranged on two sides of the surface layer and is higher than the surface layer;

the curb backrest is made of cement concrete and is provided with a containing groove for containing a curb layer, the curb layer is arranged in the containing groove, and the curb backrest is connected with the middle base layer.

10. The cement concrete pavement structure of claim 9, wherein the receiving groove comprises a groove bottom and a groove back, the curb layer is connected with the groove back, the curb layer and the groove bottom are provided with mortar cushion layers, and the mortar cushion layers are made of cement mortar.