Pavement system for road in electric power engineering booster station

Abstract

The utility model discloses a pavement system, particularly discloses a pavement system for a road in a booster station of electric power engineering, and belongs to the technical field of design and construction of structures of electric power engineering. The pavement system for the road in the electric power engineering booster station is good in permeable effect and relatively low in construction cost. The road surface system comprises a roadbed, and further comprises a water-resisting layer, a water-permeable structure layer and a water-permeable collecting and discharging structure, and the water-resisting layer and the water-permeable structure layer are sequentially laid on the roadbed upwards in the vertical direction; under the cooperation of the permeable structure layer and the water-resisting layer, the collected downward seeping water is discharged out of the pavement system through the permeable water collecting and discharging structure, the permeable coefficient of the permeable structure layer is not lower than 0.3 cm / s, and the effective void ratio is not lower than 12%.

Description

Technical Field

[0001] The utility model relates to a pavement system, in particular to a pavement system for roads in a power engineering booster station, and belongs to the technical field of design and construction of electric engineering structures. Background Art

[0002] Explanation of terms

[0003] Void ratio: Void ratio refers to the percentage of voids in the binder to the total volume of the binder, and the voids in the binder refer to the remaining part after deducting the volume occupied by the skeleton and cement from the total volume. In the binder, voids generally exist in three forms: connected voids, closed voids, and semi-connected voids. Effective voids include connected voids and semi-connected voids that can discharge free water, and invalid voids are closed voids.

[0004] Water permeability coefficient: also known as hydraulic conductivity coefficient, it is defined as the unit flow rate under unit hydraulic gradient, which represents the difficulty of fluid passing through the gaps between skeletons during the seepage process. The water permeability coefficient is closely related to the water permeability of the pavement. This indicator directly represents the drainage capacity of the pavement. The larger the water permeability coefficient, the less likely the pavement is to accumulate water and the better the water permeability.

[0005] In the design and construction of power projects, traditional substation roads are paved with hardened impermeable pavement. The use of a large number of impermeable pavements in the station means that rainwater often cannot be drained in time during rainy seasons. Rainwater accumulates quickly on the road surface and cannot seep in quickly, causing waterlogging on the road surface that can only be drained naturally through the cross slope of the road.

[0006] Sun Tianyin systematically studied the types of drainage pavement structures suitable for the construction of porous cement gravel base, and made a detailed classification of drainage pavement structures according to different conditions. Finally, he proposed the adoption range of porous cement gravel grading, but did not take into account the traffic volume within the station, and the pavement structure investment was relatively large.

[0007] Lv Wenjiang systematically studied the structural form, component materials and construction technology of the internal drainage system of the pavement structure, and recommended two types of aggregate gradations for treatment with asphalt and cement respectively. The experimental results finally showed that both mixes had good strength and drainage performance, but did not propose specific pavement structure forms and void ratio requirements suitable for traffic within booster stations.

[0008] Generally speaking, the greater the porosity of the permeable pavement structure, the better the drainage performance, but the greater the porosity, the lower the structural strength. The cement dosage of the permeable base will also affect the porosity of the cement-stabilized gravel base. Too much cement dosage will block the voids in the formed skeleton void structure, but too little cement dosage will not meet the requirements. It should have the largest possible permeability coefficient while meeting the minimum structural strength requirements. At present, there are few applications of permeable pavement structure combinations suitable for traffic in booster stations, and the cost is high, which leads to increased project costs. At present, the relevant standards and specifications formulated and promulgated by relevant national departments for the special mix ratio of permeable cement-stabilized gravel base are too broad, and there is no drainage pavement structure that can be applied to the construction of roads in booster stations. Therefore, it is of great significance to study new pavement materials that meet the requirements of road construction in booster stations in terms of structural stability and permeability, so that a large amount of rainwater collected in the rainy season can be quickly discharged from the road surface through the permeable pavement, rather than gathering on the road surface to form road surface runoff, thereby effectively reducing the step voltage and increasing the safety of booster station operation and maintenance.

[0009] In summary, most of the traditional pavement structures are impermeable pavements. In the rainy season, rainwater will accumulate quickly on the pavement and cannot penetrate quickly, resulting in waterlogging on the road. Existing research on permeable pavements has problems such as inaccurate research and high construction costs. Utility Model Content

[0010] The technical problem to be solved by the utility model is to provide a pavement system for roads in power engineering booster stations with good water permeability and relatively low construction cost.

[0011] The technical solution adopted to solve the above technical problems is: a pavement system for roads in power engineering booster stations, including a roadbed, the pavement system also includes a water-proof layer, a permeable structural layer and a permeable collection and discharge structure, the water-proof layer and the permeable structural layer are successively laid on the roadbed in a vertical direction upward; the seepage water collected by the cooperation of the permeable structural layer and the water-proof layer is discharged from the pavement system through the permeable collection and discharge structure,

[0012] Among them, the water permeability coefficient of the permeable structural layer is not less than 0.3cm / s, and the effective porosity is not less than 12%.

[0013] Furthermore, the roadbed is formed by rolling and compacting the foundation in the booster station.

[0014] A preferred embodiment of the above scheme is that the waterproof layer is a HDPE waterproof geomembrane layer which is laid on a rolled and compacted foundation at a prescribed inclination angle.

[0015] Furthermore, a three-dimensional geogrid is provided between the HDPE waterproof geomembrane layer and the rolled and compacted foundation, and the inclination angle of the HDPE waterproof geomembrane layer is limited by the three-dimensional geogrid.

[0016] The preferred embodiment of the above scheme is that the water-permeable structural layer at least comprises an upper water-permeable surface layer, a lower water-permeable surface layer and a water-permeable base layer, and the upper water-permeable surface layer, the lower water-permeable surface layer and the water-permeable base layer are sequentially laid on the water-proof layer from top to bottom in the vertical direction.

[0017] Among them, the permeability coefficient of the upper permeable surface layer shall not be less than 0.3cm / s, and the effective porosity shall not be less than 12%; the permeability coefficient of the lower permeable surface layer shall not be less than 0.3cm / s, and the effective porosity shall not be less than 18%; the permeability coefficient of the permeable base layer shall not be less than 0.5cm / s, and the effective porosity shall not be less than 22%.

[0018] Furthermore, the upper permeable surface layer is composed of a permeable asphalt concrete layer with a water permeability coefficient of 0.3cm / s-0.4cm / s, an effective void ratio of 12%-14%, and a thickness of 4-5cm.

[0019] The preferred embodiment of the above scheme is that the lower permeable surface layer is composed of permeable asphalt concrete with a water permeability coefficient of 0.3cm / s-0.4cm / s, an effective void ratio of 18%-20%, and a thickness of 8-10cm.

[0020] Furthermore, the permeable base layer is composed of a permeable cement-stabilized gravel layer, the thickness of the permeable cement-stabilized gravel layer is 18-20 cm, the effective void ratio is 22%-24%, and the water permeability coefficient is 0.5 cm / s-0.6 cm / s.

[0021] The preferred embodiment of the above scheme is that the permeable collecting and discharge structure includes a ditch and a drainage pipe. The waterproof layer is arranged inclined to both sides along the width direction with the longitudinal center line of the road surface as the symmetry center. A ditch is provided under the shoulders on both sides of the road. The bottom surface of each ditch is composed of the waterproof layer on the outside of the permeable base layer. The seepage water collected by the ditch is discharged to the outside of the ditch with the cooperation of the drainage pipe.

[0022] Furthermore, the interval between the drainage pipes arranged along the length direction is 2-3m.

[0023] The beneficial effect of the utility model is as follows: the technical solution provided by the present application is based on the roadbed in the existing booster station, and the pavement system of the present application is formed by adding a waterproof layer, a permeable structural layer and a permeable collecting and discharging structure, and the waterproof layer and the permeable structural layer are successively laid on the roadbed in the vertical direction upward, and then during the construction process, the permeability coefficient of the permeable structural layer is made not less than 0.3cm / s, and the effective porosity is not less than 12%; in this way, the pavement system in the booster station of the present application can make the rainwater falling on the road surface collected by the cooperation of the permeable structural layer and the waterproof layer when the amount of rainfall is large in the rainy season, and the seepage water discharged from the pavement system through the permeable collecting and discharging structure. Since the pavement system of the present application ensures the stability of the roadbed through a waterproof layer, and then achieves the required drainage rate by controlling the permeability coefficient and effective porosity of the permeable structural layer, it solves the technical problem in the prior art that there is no reference for pavement permeability coefficient and porosity in the substation of the electric power construction project. It is particularly suitable for the operation of roads in substations, and provides reference and guidance for the design and construction of drainage roads in substations, thereby improving the permeability effect of the pavement system provided by the present application and reducing construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the arrangement structure of the permeable collection and discharge structure, the waterproof layer and the permeable structure layer involved in the pavement system of the road in the power engineering booster station of the utility model;

[0025] Figure 2 The utility model is a schematic diagram of the arrangement structure of the waterproof layer and the permeable structural layer involved in the pavement system of the road in the power engineering booster station.

[0026] Marked in the figure are: roadbed 1, waterproof layer 2, geogrid 3, upper permeable surface layer 4, lower permeable surface layer 5, permeable base layer 6, drainage ditch 7, drainage pipe 8, shoulder 9. DETAILED DESCRIPTION

[0027] like Figure 1 , Figure 2The present invention provides a pavement system for roads in power engineering booster stations with good water permeability and relatively low construction cost. The pavement system includes a roadbed 1, a water-proof layer 2, a water-permeable structural layer and a water-permeable collection and discharge structure. The water-proof layer 2 and the water-permeable structural layer are successively laid on the roadbed 1 in a vertical direction upward; the collected seepage water under the cooperation of the water-permeable structural layer and the water-proof layer 2 is discharged from the pavement system through the water-permeable collection and discharge structure, wherein the water permeability coefficient of the water-permeable structural layer is not less than 0.3 cm / s, and the effective porosity is not less than 12%. The technical solution provided by the present application is based on the roadbed in the existing booster station, and the pavement system of the present application is formed by adding a waterproof layer, a permeable structural layer and a permeable collecting and discharging structure, and the waterproof layer and the permeable structural layer are successively laid on the roadbed in the vertical direction upward, and then during the construction process, the permeability coefficient of the permeable structural layer is made not less than 0.3cm / s, and the effective porosity is not less than 12%; in this way, the pavement system in the booster station of the present application can make the rainwater falling on the road surface collected by the cooperation of the permeable structural layer and the waterproof layer when the rainfall volume is large during the rainy season, and the seepage water discharged from the pavement system through the permeable collecting and discharging structure. Since the pavement system of the present application ensures the stability of the roadbed through the waterproof layer, and then achieves the required drainage rate by controlling the permeability coefficient and effective porosity of the permeable structural layer, it solves the technical problem that there is no reference to the pavement permeability coefficient and porosity in the booster station of the electric power construction project in the prior art, and is particularly suitable for the operation of roads in the booster station, and provides reference and guidance for the design and construction of drainage roads in the booster station, thereby improving the permeability effect of the pavement system provided by the present application and reducing the construction cost. Combined with the actual conditions in the booster station and the actual conditions during the construction process, the roadbed 1 of the present application is composed of a rolled and compacted foundation in the booster station; the waterproof layer 2 is a HDPE waterproof geomembrane layer laid on the rolled and compacted foundation at a specified inclination angle. At the same time, in order to prevent the cracking of the roadbed to the greatest extent, a three-way geogrid 3 is also provided between the HDPE waterproof geomembrane layer and the rolled and compacted foundation, and the inclination angle of the HDPE waterproof geomembrane layer is limited by the three-way geogrid 3.

[0028] Accordingly, as the key structure of the present application, in order to maximize the water permeability of the pavement system of the present application, improve the stability of the roadbed, and then minimize the step voltage and increase the safety of the operation and maintenance of the booster station, the water permeable structural layer of the present application at least includes an upper water permeable surface layer 4, a lower water permeable surface layer 5 and a water permeable base layer 6, and the upper water permeable surface layer 4, the lower water permeable surface layer 5 and the water permeable base layer 6 are laid on the waterproof layer 2 in a vertical direction from top to bottom. According to the requirements, the water permeability coefficient of the upper water permeable surface layer 4 of the present application should not be less than 0.3cm / s, and the effective porosity should not be less than 12%; the water permeability coefficient of the lower water permeable surface layer 5 should not be less than 0.3cm / s, and the effective porosity should not be less than 18%; the water permeability coefficient of the water permeable base layer 6 should not be less than 0.5cm / s, and the effective porosity should not be less than 22%. Combined with the existing materials and the construction process level, the upper permeable surface layer 4 of the present application is composed of a permeable asphalt concrete layer with a water permeability coefficient of 0.3cm / s-0.4cm / s, an effective porosity of 12%-14%, and a thickness of 4-5cm; the lower permeable surface layer 5 is composed of a permeable asphalt concrete layer with a water permeability coefficient of 0.3cm / s-0.4cm / s, an effective porosity of 18%-20%, and a thickness of 8-10cm; the permeable base layer 6 is composed of a permeable cement stabilized gravel layer, the thickness of the permeable cement stabilized gravel layer is 18-20cm, the effective porosity is 22%-24%, and the water permeability coefficient is 0.5cm / s-0.6cm / s, wherein the cement dosage used in the cement stabilized gravel mixture is 6%-8%, and the aggregate 4.75mm sieve hole pass rate is between 6% and 10%. Furthermore, the permeable collection and discharge structure described in the present application includes a water collection ditch 7 and a drainage pipe 8. The water-blocking layer 2 is arranged obliquely to both sides along the width direction with the longitudinal center line of the road surface as the symmetric center. A water collection ditch 7 is arranged below the shoulders 9 on both sides of the road. The bottom surface of each water collection ditch 7 is composed of the water-blocking layer 2 outside the permeable base layer. The seepage water collected by the water collection ditch 7 is discharged to the outside of the water collection ditch 7 with the cooperation of the drainage pipe 8. The spacing between each drainage pipe 8 arranged along the length direction is 2-3m.

[0029] In summary, the present application provides a structural combination suitable for the construction of drainage pavement of roads in booster stations. The permeable pavement structure features the following from top to bottom: permeable surface layer, permeable base layer, impermeable layer, roadbed; the impermeable layer adopts HDPE waterproof geomembrane to prevent rainwater from penetrating into the roadbed, and a three-way geogrid is arranged between the roadbed and the impermeable layer to prevent the roadbed from cracking. This drainage pavement structure enables the road to quickly drain the road surface water in the rainy season, reduce the step voltage, and increase the safety of booster station operation and maintenance;

[0030] Accordingly, a rainwater seepage comprehensive drainage method is proposed. The rainwater drainage system relies on the water seepage performance of the surface layer and the base layer to collect rainwater seeping from the drainage road surface into the longitudinal drainage ditch filled with permeable materials, and then discharge the collected rainwater into the road through the horizontal PVC outlet pipes arranged at a certain interval. This drainage system can effectively prevent dust and other debris from clogging the drainage outlet, and the outlet spacing is 2 to 3 meters.

[0031] In summary, this pavement structure and drainage method can provide a reference for the design and construction of roads within booster stations.

Claims

1. A pavement system for a road in a power engineering booster station, comprising a roadbed (1), characterized in that: The pavement system further comprises a waterproof layer (2), a permeable structural layer and a permeable collection and discharge structure. The waterproof layer (2) and the permeable structural layer are successively laid on the roadbed (1) in a vertical direction upward; the seepage water collected by the permeable structural layer and the waterproof layer (2) is discharged from the pavement system through the permeable collection and discharge structure. Among them, the water permeability coefficient of the permeable structural layer is not less than 0.3cm / s, and the effective porosity is not less than 12%.

2. The pavement system for roads in power engineering booster stations according to claim 1, characterized in that: The roadbed (1) is formed by rolling and compacting the foundation in the booster station.

3. The pavement system for roads in power engineering booster stations according to claim 2 is characterized in that: The waterproof layer (2) is a HDPE waterproof geomembrane layer which is laid on the compacted foundation at a prescribed inclination angle.

4. The pavement system for roads in power engineering booster stations according to claim 3 is characterized in that: A three-dimensional geogrid (3) is also provided between the HDPE waterproof geomembrane layer and the rolled and compacted foundation, and the inclination angle of the HDPE waterproof geomembrane layer is limited by the three-dimensional geogrid (3).

5. The pavement system for roads in power engineering booster stations according to claim 1, 2, 3 or 4, characterized in that: The water-permeable structural layer at least comprises an upper water-permeable surface layer (4), a lower water-permeable surface layer (5) and a water-permeable base layer (6), wherein the upper water-permeable surface layer (4), the lower water-permeable surface layer (5) and the water-permeable base layer (6) are sequentially laid on the water-proof layer (2) from top to bottom in the vertical direction. The water permeability coefficient of the upper permeable surface layer (4) is not less than 0.3 cm / s, and the effective porosity is not less than 12%; the water permeability coefficient of the lower permeable surface layer (5) is not less than 0.3 cm / s, and the effective porosity is not less than 18%; the water permeability coefficient of the permeable base layer (6) is not less than 0.5 cm / s, and the effective porosity is not less than 22%.

6. The pavement system for roads in power engineering booster stations according to claim 5, characterized in that: The upper permeable surface layer (4) is composed of a permeable asphalt concrete layer with a water permeability coefficient of 0.3cm / s-0.4cm / s, an effective void ratio of 12%-14% and a thickness of 4-5cm.

7. The pavement system for roads in power engineering booster stations according to claim 6, characterized in that: The lower permeable surface layer (5) is composed of permeable asphalt concrete with a water permeability coefficient of 0.3cm / s-0.4cm / s, an effective void ratio of 18%-20%, and a thickness of 8-10cm.

8. The pavement system for roads in power engineering booster stations according to claim 7, characterized in that: The permeable base layer (6) is composed of a permeable cement-stabilized gravel layer, the thickness of which is 18-20 cm, the effective void ratio is 22%-24%, and the water permeability coefficient is 0.5 cm / s-0.6 cm / s.

9. The pavement system for roads in power engineering booster stations according to claim 8, characterized in that: The permeable collection and discharge structure comprises a water collection ditch (7) and a drainage pipe (8). The water-blocking layer (2) is arranged symmetrically with the longitudinal center line of the road surface and is inclined toward both sides along the width direction. A water collection ditch (7) is arranged below the road shoulders (9) on both sides of the road. The bottom surface of each water collection ditch (7) is formed by the water-blocking layer (2) outside the permeable base layer. The seepage water collected by the water collection ditch (7) is discharged to the outside of the water collection ditch (7) in cooperation with the drainage pipe (8).

10. The pavement system for roads in power engineering booster stations according to claim 9, characterized in that: The distance between the drainage pipes (8) arranged along the length direction is 2-3 m.

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