Pavement structure with modified water permeability and pollutant removal functions suitable for transformer substation

Abstract

The utility model discloses a modified permeable and pollutant-removing pavement structure suitable for a transformer substation, which comprises a soil base layer, a secondary filter layer, a primary filter layer, geotechnical cloth, a leveling layer and a modified permeable concrete pavement surface layer which are sequentially arranged from bottom to top, the modified pervious concrete pavement surface layer is formed by pouring modified pervious concrete, an anti-crack fiber net is arranged at the top of the modified pervious concrete pavement surface layer, meanwhile, expansion joints are arranged at certain intervals in the length direction, and the expansion joints are filled with neutral weather-proof silicone to form a buffer layer; the leveling layer adopts medium-coarse sand with the particle size of 4-8 mm, the primary filter layer adopts a graded recycled aggregate cushion layer with the particle size of 10-15 mm, the secondary filter layer adopts a graded recycled graded broken stone cushion layer with the particle size of 25-30 mm, the soil base layer is formed by compacting undisturbed soil, and the compaction coefficient is not smaller than 0.95. The road is excellent in water permeability, can intercept pollutants in rainwater, and is suitable for being used as an operation and maintenance road of a transformer substation.

Description

Technical Field

[0001] This utility model relates to road surface structures, specifically to a road surface structure suitable for substations with modified permeability and pollutant removal capabilities. Background Technology

[0002] Permeable pavement is a crucial component of "sponge city" construction, effectively reducing urban surface runoff, accelerating rainwater infiltration, and to some extent reducing pollutant concentrations during rainwater runoff, thus mitigating the harm rainwater poses to groundwater. Currently, substation main roads are primarily concrete and asphalt roads, while internal plazas and patrol paths are mainly concrete and permeable brick plazas. Cases of permeable pavement application in substations are very rare. Furthermore, the maintenance technology for permeable brick plazas within substations is not mature, especially in areas with frequent dust and sandstorms like Xinjiang. Permeable brick pavements are easily clogged by dust and sand, causing a significant decline in permeability over time. In addition, the removal of pollutant concentrations during rainwater runoff is not considered for roads within substations. This could lead to large amounts of polluted rainwater entering the ground or flowing into municipal stormwater pipes during extreme rainstorms, causing rainwater runoff pollution. Utility Model Content

[0003] Purpose of the utility model: The purpose of this utility model is to provide a pavement structure with modified permeability and pollutant removal for substations, so as to solve the problem of poor permeability and inability to remove pollutants from rainwater in current substation roads, and to provide a solution for the application of "sponge city" in substations.

[0004] Technical solution: This utility model provides a pavement structure for substations with modified permeability and pollutant removal, comprising, from bottom to top, a soil base layer, a filter layer, a geotextile, a leveling layer, and a modified permeable concrete pavement surface layer, wherein the modified permeable concrete pavement surface layer is formed by pouring modified permeable concrete.

[0005] Furthermore, a crack-resistant fiber mesh is installed on top of the modified permeable concrete pavement surface layer.

[0006] Furthermore, the modified permeable concrete pavement surface layer has expansion joints at regular intervals along its length, and a buffer layer is installed inside the expansion joints.

[0007] Furthermore, the buffer layer is formed by filling with neutral weather-resistant silicone.

[0008] Furthermore, the filter layer is configured as two layers, including a primary filter layer and a secondary filter layer, wherein the primary filter layer adopts a 10-15mm graded recycled aggregate pad layer, and the secondary filter layer adopts a 25-30mm graded recycled graded crushed stone pad layer.

[0009] Furthermore, the leveling layer uses medium-coarse sand with a particle size of 4-8mm.

[0010] Furthermore, the soil base layer is formed by compacting the original soil, with a compaction coefficient of not less than 0.95.

[0011] Beneficial effects: Compared with the prior art, this utility model has the following advantages:

[0012] The road structure proposed in this invention can serve as a maintenance road for substations. Utilizing the permeability of the modified permeable concrete pavement and geotextile, rainwater can infiltrate smoothly, preventing water accumulation on the road surface. A filter layer effectively intercepts and purifies the rainwater by removing suspended solids (SS), carbon dioxide (COD), total nitrogen (TN), and total phosphorus (TP), thereby reducing pollution of subsequent water bodies by the substation's rainwater drainage system. Compared to traditional road structures in substations, this invention reduces the manpower and resources required for road cleaning by substation maintenance personnel, lowering maintenance costs. Attached Figure Description

[0013] Figure 1 This is a cross-sectional view of the road structure provided in an embodiment of this utility model. Detailed Implementation

[0014] The present invention will be further described below with reference to the accompanying drawings.

[0015] Appendix Figure 1 The accompanying figure labels are as follows:

[0016] 1. Modified permeable concrete pavement surface layer; 2. Leveling layer; 3. Geotextile; 4. Primary filter layer; 5. Secondary filter layer; 6. Soil base layer; 7. Crack-resistant fiber mesh; 8. Buffer layer.

[0017] like Figure 1 As shown, this utility model embodiment provides a pavement structure suitable for substations with modified permeability and pollutant removal, including a soil base layer 6, a secondary filter layer 5, a primary filter layer 4, a geotextile 3, a leveling layer 2, and a modified permeable concrete pavement surface layer 1 arranged sequentially from bottom to top.

[0018] The modified permeable concrete pavement surface layer 1 is formed by pouring modified permeable concrete. The modified permeable concrete is made of PO42.5 grade ordinary Portland cement, single-grade recycled aggregate with a particle size of 2-5mm, ultrafine slag powder S140, and polycarboxylate high-performance water-reducing agent, and is prepared according to a water-cement ratio of 3:10 and an aggregate-cement ratio of 3:7.

[0019] The modified permeable concrete pavement surface layer 1 is topped with a crack-resistant fiber mesh 7, which can improve the crack resistance of the pavement.

[0020] The modified permeable concrete pavement layer 1 has expansion joints at regular intervals along its length, and a buffer layer 8 is installed inside the expansion joints. The buffer layer 8 is formed by filling with neutral weather-resistant silicone.

[0021] Leveling layer 2 uses medium-coarse sand with a particle size of 4-8mm.

[0022] The primary filter layer 4 uses a 10-15mm graded recycled aggregate subbase. This subbase provides the first filtration of infiltrated rainwater, effectively reducing the levels of suspended solids (SS), carbon dioxide (COD), total nitrogen (TN), and total phosphorus (TP). The secondary filter layer 5 uses a 25-30mm graded recycled graded crushed stone subbase. This subbase provides a second filtration of infiltrated rainwater. Due to its larger particle size and correspondingly larger specific surface area, it can further remove TN and TP from the rainwater. In addition, the recycled graded crushed stone subbase effectively disperses the load from the upper pavement, reducing the impact of equipment transportation on the road and ensuring the stability of the roadbed.

[0023] Geotextile 3 has the characteristics of isolation, filtration, drainage, reinforcement, protection and puncture resistance. It can prevent rainwater impurities and the medium and coarse sand of leveling layer 2 from clogging the voids of recycled aggregate cushion layer (primary filter layer 4) and affecting rainwater infiltration.

[0024] The soil base course 6 is formed by compacting the original soil with a compaction coefficient of not less than 0.95, in order to prevent the modified permeable pavement structure and the pavement structure that removes pollutants from settling.

[0025] The road structure construction method provided in this embodiment of the utility model is as follows:

[0026] During construction, the foundation pit is excavated according to the depth of the road structure, and then the soil at the bottom of the foundation pit is compacted with a compaction coefficient of not less than 0.95 to form a soil base layer 6.

[0027] Next, a 25-30mm graded recycled crushed stone cushion layer is laid on top of the soil base layer 6 to form a secondary filter layer 5. A 10-15mm graded recycled aggregate cushion layer is then laid on top of the secondary filter layer 5 to form a primary filter layer 4. Geotextile 3 is then laid on top of the primary filter layer 4, followed by a 4-8mm medium-coarse sand layer on top of the geotextile 3 to form a leveling layer 2. The top of the leveling layer 2 is adjusted to a uniform elevation.

[0028] Then, modified permeable concrete is poured on top of the leveling layer 2 to form the modified permeable concrete pavement layer 1. Simultaneously, crack-resistant fiber mesh 7 is added to the top of the modified permeable concrete pavement layer 1. At the same time, expansion joints are set at regular intervals along the length of the modified permeable concrete pavement layer 1, and each expansion joint is filled with neutral weather-resistant silicone to form a buffer layer 8. This completes the construction.

Claims

1. A pavement structure suitable for substations with modified permeability and pollutant removal capabilities, characterized in that, The structure includes, from bottom to top, a soil base layer (6), a filter layer, a geotextile (3), a leveling layer (2), and a modified permeable concrete pavement surface layer (1), wherein the modified permeable concrete pavement surface layer (1) is formed by pouring modified permeable concrete; the filter layer is configured as two layers, including a primary filter layer (4) and a secondary filter layer (5), wherein the primary filter layer (4) adopts a 10-15mm graded recycled aggregate cushion layer, and the secondary filter layer (5) adopts a 25-30mm graded recycled graded crushed stone cushion layer.

2. The road structure according to claim 1, characterized in that, The modified permeable concrete pavement surface layer (1) is topped with crack-resistant fiber mesh (7).

3. The road structure according to claim 1, characterized in that, The modified permeable concrete pavement (1) has expansion joints at regular intervals along its length, and a buffer layer (8) is provided inside the expansion joints.

4. The road structure according to claim 3, characterized in that, The buffer layer (8) is formed by filling with neutral weather-resistant silicone.

5. The road structure according to claim 1, characterized in that, The leveling layer (2) uses medium-coarse sand with a particle size of 4-8mm.

6. The road structure according to claim 1, characterized in that, The soil base layer (6) is formed by compacting the original soil, with a compaction coefficient of not less than 0.95.

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