Ecological permeable pavement structure and construction method for collapsible loess green land

Abstract

The present application relates to an ecological permeable pavement structure and a construction method thereof for collapsible loess green land, and belongs to the technical field of park green land garden roads, which includes a plain soil rolling layer, a gray soil base layer and a reinforced concrete layer are laid on the plain soil rolling layer, two drainage ditches are arranged on the reinforced concrete layer, a drainage layer is arranged on the reinforced concrete layer, a sandless macroporous concrete cushion layer is arranged on the drainage layer, the sandless macroporous concrete cushion layer is located between the two drainage ditches, a plurality of infiltration tubes are arranged on the sandless macroporous concrete cushion layer, a plurality of permeable tubes are opened on the outer wall of the infiltration tube, a non-woven fabric is wrapped on the outer wall of the infiltration tube, a protective layer and an adhesive layer are arranged on the upper part of the infiltration tube, a permeable surface layer is arranged on the upper part of the adhesive layer, one end of the infiltration tube is inserted into one of the drainage ditches, and the other end of the infiltration tube is inserted into another drainage ditch. The present application has the effect of effectively avoiding water accumulation on the road and delaying runoff on the road surface.

Description

Technical Field

[0001] The present application relates to the technical field of park green space and road construction, and in particular to an ecological permeable pavement structure and a construction method thereof for use in collapsible loess green space. Background Art

[0002] Collapsible loess is a special type of soil with relatively uniform texture and loose structure. When not soaked in water, it is generally strong. When soaked in water under moving pressure, the soil structure will be quickly destroyed, resulting in large additional settlement, and the strength will decrease rapidly, which can easily lead to foundation collapse.

[0003] Collapsible loess is widely distributed in my country, and urban waterlogging disasters in collapsible loess areas are very serious. Therefore, how to effectively apply permeable concrete pavement in this area is an urgent problem. For example, the Chinese utility model patent with publication number CN208792083U discloses a permeable brick road in collapsible loess areas, including a plain soil rammed layer, a gray soil cushion layer, a plain concrete cushion layer, a crushed stone layer, a permeable concrete layer, a bonding layer and a permeable brick layer. The plain soil rammed layer is formed by ramming the collapsible loess, and the gray soil cushion layer and the plain concrete cushion layer are laid on the plain soil rammed layer in sequence. The crushed stone layer, the permeable concrete layer, the bonding layer and the permeable brick layer are laid on the plain concrete cushion layer in sequence. The bonding layer includes medium-coarse sand, and a diversion pipe is provided in the crushed stone layer, and the diversion pipe is surrounded by a permeable layer.

[0004] When it rains, the accumulated water in the diversion pipe is discharged into the outer soil layer, which will cause the soil layer around the foundation to sink after being soaked by water, thus causing the foundation to collapse. Summary of the invention

[0005] In order to reduce the occurrence of water accumulation on roads and subsidence of foundations, the present application provides an ecological permeable pavement structure and a construction method thereof for use in collapsible loess green spaces.

[0006] On the one hand, the ecological permeable pavement structure provided in the present application for collapsible loess green space adopts the following technical solution:

[0007] An ecological permeable pavement structure used in collapsible loess green space, comprising a plain soil compaction layer, a gray soil base layer laid on the plain soil compaction layer, a reinforced concrete layer poured on the gray soil base layer, two drainage ditches arranged on the reinforced concrete layer, a drainage layer arranged on the reinforced concrete layer, the drainage layer comprising a drainage board, a sandless macroporous concrete cushion layer arranged on the drainage layer, the sandless macroporous concrete cushion layer being located between the two drainage ditches, a plurality of infiltration tubes arranged on the sandless macroporous concrete cushion layer, a plurality of permeation tubes being opened on the outer wall of the infiltration tubes, the outer wall of the infiltration tubes being wrapped with non-woven fabric, an adhesive layer arranged on the upper part of the infiltration tubes, a permeable surface layer arranged on the upper part of the adhesive layer, one end of the infiltration tube being inserted into one of the drainage ditches, and the other end of the infiltration tube being inserted into the other drainage ditch.

[0008] By adopting the above technical solution, two drainage ditches are set above the reinforced concrete layer, and multiple infiltration pipes are set above the sandless macroporous concrete cushion layer. When it rains, rainwater will infiltrate into the base layer under the surface through the permeable surface layer. Part of the rainwater enters the infiltration pipe through the pores of the infiltration pipe, and then flows into the drainage ditches on both sides through the infiltration pipe. The other part of the rainwater that has not yet entered the infiltration pipe will continue to infiltrate, pass through the sandless macroporous concrete, and then pass through the filter layer to infiltrate to the drainage board, and finally be discharged to the end rainwater collection area through the drainage board; the rainwater that has not yet infiltrated through the surface layer will flow through the cross slope of the road surface to the precast concrete drainage ditches on both sides. The drainage ditches can collect rainwater and reuse it again. At the same time, when the rainwater is too heavy, the water in the green space on both sides of the road can also pass through the permeable panel into the drainage ditches on both sides, thereby preventing the green space from backflowing onto the road. A gray soil base layer is set above the plain soil rolling layer, and a reinforced concrete layer is laid above the gray soil base layer. The reinforced concrete layer can increase the strength of the road. When the plain soil rolling layer partially collapses, it will not affect the road. The setting of the drainage board can quickly drain the water that has penetrated into the sand-free large-pore concrete cushion layer. The drainage board can drain water in an organized manner and prevent rainwater from penetrating into the reinforced concrete layer, increasing the overall stability of the road. Compared with plain concrete, reinforced concrete has stronger stability and strength. The plain concrete layer shrinks under low temperature conditions in winter, and the internal water freezes, causing frost heave and cracks, which will affect the strength of the concrete.

[0009] Optionally, the drainage layer further includes an anti-filtration geotextile, the drainage board is located above the reinforced concrete layer, the anti-filtration geotextile is laid above the drainage board, and a medium sand filter layer is laid above the anti-filtration geotextile.

[0010] By adopting the above technical solution, anti-filtration geotextile and medium sand filter layer are laid above the drainage board, which can reduce the possibility of impurities entering the drainage channel on the drainage board and make the drainage board drain smoothly.

[0011] Optionally, a reserved groove is provided in the reinforced concrete layer, the bottom of the drainage ditch is inserted into the reserved groove, and cement mortar is provided at the bottom of the reserved groove and the bottom of the drainage ditch.

[0012] By adopting the above technical solution, when installing the drainage ditch, the drainage ditch is placed in the reserved groove and fixed by cement mortar.

[0013] Optionally, the two drainage ditches are provided with concrete corners on the sides away from each other, and the concrete corners are installed above the medium sand filter layer. An installation groove is opened on the side of the concrete corner close to the drainage ditch, and a curbstone is arranged in the installation groove. Cement mortar is arranged between the bottom of the curbstone and the bottom wall of the installation groove.

[0014] By adopting the above technical solution, after the concrete corner is installed above the medium sand filter layer, the curb is installed in the installation groove, thereby increasing the stability of the curb.

[0015] Optionally, the bonding layer is permeable mortar, the permeable surface layer is permeable concrete bricks, a grate plate is installed on the permeable concrete bricks directly above the drainage ditch, and coral stone or gravel is arranged inside the drainage ditch.

[0016] By adopting the above technical solution, the bonding layer is a permeable mortar, and the cement mortar plays a protective role on the permeable pipe. The permeable concrete bricks directly above the drainage ditch are all installed with grate plates, and rainwater can more easily enter the drainage ditch through the grate plates, which can avoid the water infiltration on the green land to the greatest extent, causing the soil on both sides of the garden road to collapse and deform, thereby affecting the roadbed. Coral stone or gravel can filter impurities in rainwater and reduce the possibility of clogging the drainage ditch.

[0017] On the other hand, the present application also provides a construction method for an ecological permeable pavement structure in a collapsible loess green space, comprising the following steps:

[0018] Dig and process the foundation pit, and compact the raw soil layer;

[0019] Laying the lime soil base;

[0020] pouring reinforced concrete layer;

[0021] Install finished drainage ditches;

[0022] Laying drainage layer;

[0023] Laying of sand-free macroporous concrete cushion;

[0024] Laying of infiltration pipes;

[0025] Lay the bonding layer and permeable surface layer.

[0026] By adopting the above technical solution, the gray soil base and reinforced concrete layer can increase the overall stability of the road. When the soil under the reinforced concrete layer collapses, the road will not be affected. After raining, rainwater will enter the infiltration pipe through the permeable surface layer and then flow into the drainage ditch. Some rainwater will be discharged in the drainage layer through the sand-free large-pore concrete cushion layer. Rainwater will not enter the reinforced concrete, protecting the soil under the reinforced concrete layer. This method can effectively avoid water accumulation on the road and delay runoff on the road surface; it can effectively prevent surface water from infiltrating into the roadbed and causing damage to the foundation structure and soil, ensuring the stability of the road; it can avoid pollution to the foundation soil to the greatest extent; through orderly drainage, it can fully store, collect and utilize road seepage water.

[0027] Optionally, during the process of excavating and treating the foundation pit, the compaction degree of the bare soil rolling layer is greater than or equal to 0.93, and a ring knife sampling test is carried out on the soil bulk density after compaction.

[0028] Optionally, during the process of pouring the reinforced concrete layer, the steel bars are required to be firmly tied, premixed concrete is selected, and pouring is carried out by two methods: continuous pouring and block pouring. The joints need to be treated as construction joints, and manual and vibrator methods are used to ensure that the concrete is dense and the surface is smooth.

[0029] Optionally, during the installation of the finished drainage ditch, drainage ditches of different specifications are set up in combination with the overall sponge requirements of the park, and pipe holes are opened on the side of the drainage ditch close to the road for the infiltration pipe to pass through; during the laying of the drainage layer, the drainage boards are tightly fastened and overlapped, and anti-filtration geotextile and medium sand filter layer are laid above the drainage boards.

[0030] Optionally, during the process of laying the infiltration pipe, wrap the outside of the infiltration pipe with non-woven fabric, and place the infiltration pipe according to the designed drainage slope, with the middle of the infiltration pipe high and the two ends low.

[0031] By adopting the above technical solution, the non-woven fabric filters rainwater and reduces the possibility of bare soil entering the infiltration pipe. The infiltration pipe is high in the middle and low at both ends, which facilitates rainwater to flow into the drainage ditch.

[0032] In summary, the present application includes at least one of the following beneficial technical effects:

[0033] 1. It can effectively prevent water accumulation on the road and runoff on the road surface; it can effectively prevent surface water from seeping into the roadbed and damaging the foundation structure and soil, thus ensuring the stability of the road; it can avoid pollution of the foundation soil to the greatest extent; through orderly drainage, it can fully store, collect and utilize the seepage water on the road surface;

[0034] 2. Laying anti-filter geotextile and medium sand filter layer on the drainage board can reduce the possibility of plain soil entering the drainage channel on the drainage board, making the drainage of the drainage board smooth;

[0035] 3. Grate plates are installed on the permeable concrete bricks directly above the drainage ditch, so that rainwater can enter the drainage ditch more easily through the grate plates, thus minimizing the possibility of water infiltration into the green space causing soil collapse and deformation on both sides of the garden path, thereby affecting the roadbed. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the permeable pavement structure of the present application.

[0037] Figure 2 It is a schematic diagram of the structure of the grate plate in this application.

[0038] Explanation of the reference numerals: 1. Compacted soil layer; 2. Lime soil base layer; 3. Reinforced concrete layer; 31. Reserved groove; 32. Drainage ditch; 4. Drainage layer; 41. Drainage board; 42. Anti-filtration geotextile; 43. Medium sand filter layer; 5. Sandless large-pore concrete cushion layer; 6. Infiltration pipe; 61. Pipe hole; 7. Concrete corner filling; 71. Installation groove; 72. Curbstone; 73. Cement mortar; 8. Permeable mortar; 9. Permeable concrete brick; 91. Grate plate. DETAILED DESCRIPTION

[0039] The following is combined with Figure 1 -Attached Figure 2 This application is described in further detail.

[0040] Reference Figure 1 and Figure 2 The embodiment of the present application discloses an ecological permeable pavement structure for use in collapsible loess green space, including a plain soil rolling layer 1, which is compacted by equipment such as a rammer and a roller to ensure that the compaction degree of the plain soil is greater than or equal to 0.93.

[0041] A lime soil base layer 2 is laid on the plain soil rolling layer 1. The thickness of the lime soil base layer 2 is 150 mm. The lime soil base layer 2 is laid on the plain soil rolling layer 1. The lime soil base layer 2 is compacted in time after laying, and the compaction coefficient is greater than or equal to 0.93. The ratio of lime to soil in the lime soil base layer 2 is 3:7.

[0042] A 150 mm thick C20 reinforced concrete layer 3 is laid above the ash soil base layer 2. Two drainage ditches 32 are arranged above the reinforced concrete layer 3. A reserved groove 31 is arranged in the reinforced concrete layer 3. Cement mortar 73 is arranged at the bottom of the reserved groove 31. The thickness of the cement mortar 73 is 30 mm. The bottom of the drainage ditch 32 is located in the reserved groove 31.

[0043] A drainage layer 4 is arranged above the reinforced concrete layer 3, and the drainage layer 4 includes a drainage board 41, a filter geotextile 42 and a medium sand filter layer 43 arranged in sequence from bottom to top. The filter geotextile 42 and the medium sand filter layer 43 can reduce the entry of impurities such as plain soil into the drainage channel of the drainage board 41, and can ensure smooth drainage of the drainage layer 4.

[0044] A 150mm thick C20 sandless macroporous concrete cushion layer 5 is arranged above the drainage layer 4. The sandless macroporous concrete cushion layer 5 is located between the two drainage ditches 32. The sandless macroporous concrete cushion layer 5 can increase the bearing capacity of the roadbed. The laying thickness depends on the bearing requirements of the pavement. The laying requirements can refer to the laying requirements of the reinforced concrete layer 3.

[0045] A permeable pipe 6 is arranged above the sand-free macroporous concrete cushion layer 5, and a plurality of perforations are provided on the outer wall of the permeable pipe 6. The outer wall of the permeable pipe 6 is wrapped with non-woven fabric, and rainwater can enter the permeable pipe 6 through the perforations through the non-woven fabric. The permeable pipe 6 is placed according to the designed drainage slope angle, with the middle of the permeable pipe 6 being high and the two sides being low. A permeable pipe hole 61 is provided on the side wall of the drainage ditch 32, and one end of the permeable pipe 6 close to the drainage ditch 32 passes through the permeable pipe hole 61 and is inserted into the drainage ditch 32.

[0046] A concrete corner 7 is provided on the side of the two drainage ditches 32 away from each other. A mounting groove 71 is provided on the side of the concrete corner 7 close to the drainage ditch 32. A curbstone 72 is provided in the mounting groove 71. A 30 mm thick cement mortar 73 is provided between the bottom of the curbstone 72 and the bottom wall of the mounting groove 71.

[0047] The concrete corner 7 is located above the medium sand filter layer 43, and a bonding layer and a protective layer are provided above the sandless macroporous concrete cushion layer 5, and both the bonding layer and the protective layer are permeable mortar 8. A permeable surface layer is provided above the bonding layer, and the permeable surface layer is located between two curbstones 72, and the permeable surface layer is a permeable concrete brick 9. The upper surface of the curbstone 72 is flush with the upper surface of the permeable surface layer, and planting soil is provided on the side of the two curbstones 72 away from each other.

[0048] A grate plate 91 is provided on the permeable concrete brick 9 directly above the drainage ditch 32, so that the water in the road and the water in the green space on both sides of the road can be discharged into the drainage ditch 32 in time. The water in the road passes through the permeable concrete brick 9 into the permeable mortar 8, then enters the permeable pipe 6 from the pipe hole 61, and enters the drainage ditch 32 from the permeable pipe 6. The drainage ditch 32 can collect the water on the road surface for reuse.

[0049] Coral stones or gravel are placed at the bottom of the drainage ditch 32 to purify large particles of impurities in rainwater and reduce the possibility of clogging of the drainage ditch.

[0050] The present application also discloses a construction method for an ecological permeable pavement structure in a collapsible loess green space, comprising the following steps:

[0051] S1. Dig and treat the foundation pit for paving. Dig the foundation pit for paving the garden road according to the design drawings, clean up the garbage in the pit, and ensure that the surface of the pit is clean and does not contain large particles of gravel. Use tamping machines, rollers and other equipment to compact the existing soil layer to ensure that the compaction degree of the bare soil is greater than or equal to 0.93, and perform a ring knife sampling test on the bulk density of the compacted soil. This step should not be carried out in the rainy season.

[0052] S2. Lay the lime soil base layer 2. After the soil compaction meets the requirements, lay the lime soil base layer 2 according to the thickness requirements of the drawing (150-200mm for pedestrians and 300mm for vehicles). The sand and gravel ratio and particle requirements must meet the ratio requirements. After laying, compact it in time, and the compaction coefficient is greater than or equal to 0.93.

[0053] S3, pouring reinforced concrete layer 3. The steel bars are required to be firmly tied, and premixed concrete is selected. The pouring adopts two methods: continuous pouring and block pouring. The joints need to be treated as construction joints, and manual and vibrating methods are used to ensure that the concrete is dense and the surface is flat. It should be noted that the concrete pouring should be carried out between 5-35 degrees. Insulation treatment is required for winter construction, and expansion joints are made at intervals of 6 meters.

[0054] S4. Install the finished drainage ditch 32 (brick-built ditch). Drainage ditches 32 of different specifications are set according to the overall sponge requirements of the park, and a pipe hole 61 is reserved on the side of the road to collect the seepage water of the permeable garden road and drain the seepage water to the designated location in an orderly manner through the drainage ditch 32 to prevent surface water from infiltrating the soil layer and causing deformation.

[0055] S5, laying the drainage layer 4. Select qualified drainage materials, overlap adjacent drainage boards tightly, and lay anti-filter geotextile 42 and medium sand filter layer 43 on the upper part to prevent raw soil from entering the drainage channel and blocking the drainage layer 4 from draining smoothly.

[0056] S6. Lay the sand-free macroporous concrete cushion layer 5. This step is to ensure the bearing capacity of the road base, and the laying thickness depends on the bearing requirements of the paving. The laying requirements can refer to the reinforced concrete laying requirements in S3.

[0057] S7, laying HDPE infiltration pipe 6. Select qualified products, cover with non-woven filter layer, place the pipe according to the designed drainage slope, connect with the drainage ditch 32, and protect the finished product.

[0058] S8. Lay the bonding layer and the permeable surface layer. The bonding layer uses permeable mortar 8, and the permeable surface layer can use permeable concrete bricks 9 (exposed aggregate) and other high-permeability paving surface layers.

[0059] This construction method of permeable pavement structure for collapsible loess areas has the following advantages:

[0060] It can effectively avoid water accumulation on the road and delay the runoff on the road surface; it can effectively prevent surface water from seeping into the roadbed and causing damage to the foundation structure and soil, thereby ensuring the stability of the road; it can avoid pollution to the foundation soil to the greatest extent possible; through orderly drainage, it can fully store, collect and utilize road seepage water; purify large particles of impurities in the surface water to avoid clogging of the drainage systems on both sides by impurities in the surface water; collect surface water in the green spaces on both sides of the road, and avoid the infiltration of green space water to the greatest extent possible, causing the soil on both sides of the garden road to wet and deform, thereby affecting the roadbed.

[0061] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. Ecological permeable pavement structure used in collapsible loess green land, characterized by: The invention comprises a plain soil compaction layer (1), a lime soil base layer (2) is laid on the plain soil compaction layer (1), a reinforced concrete layer (3) is poured on the lime soil base layer (2), two drainage ditches (32) are arranged on the reinforced concrete layer (3), a drainage layer (4) is arranged on the reinforced concrete layer (3), the drainage layer (4) comprises a drainage board (41), a sand-free macroporous concrete cushion layer (5) is arranged on the drainage layer (4), and the sand-free macroporous concrete cushion layer (5) is located between two drainage ditches (32) and a drainage board (41) is arranged on the drainage layer (4). Between the drainage ditches (32), a plurality of permeable tubes (6) are arranged above the sandless macroporous concrete cushion layer (5), a plurality of permeable tubes (6) are provided on the outer wall of the permeable tubes (6), a non-woven fabric is wrapped on the outer wall of the permeable tubes (6), an adhesive layer is arranged above the permeable tubes (6), a permeable surface layer is arranged above the adhesive layer, one end of the permeable tube (6) is inserted into one of the drainage ditches (32), and the other end of the permeable tube (6) is inserted into another of the drainage ditches (32).

2. The ecological permeable pavement structure for collapsible loess green space according to claim 1 is characterized in that: The drainage layer (4) further comprises a reverse filter geotextile (42); the drainage board (41) is located above the reinforced concrete layer (3); the reverse filter geotextile (42) is laid above the drainage board (41); and a medium sand filter layer (43) is laid above the reverse filter geotextile (42).

3. The ecological permeable pavement structure for collapsible loess green space according to claim 2 is characterized in that: A reserved groove (31) is provided in the reinforced concrete layer (3), the bottom of the drainage ditch (32) is inserted into the reserved groove (31), and cement mortar (73) is provided at the bottom of the reserved groove (31) and the bottom of the drainage ditch (32).

4. The ecological permeable pavement structure for collapsible loess green space according to claim 2 or 3, characterized in that: Concrete corners (7) are provided on the sides of the two drainage ditches (32) that are away from each other. The concrete corners (7) are installed above the medium sand filter layer (43). A mounting groove (71) is provided on the side of the concrete corners (7) close to the drainage ditches (32). A curbstone (72) is provided in the mounting groove (71). Cement mortar (73) is provided between the bottom of the curbstone (72) and the bottom wall of the mounting groove (71).

5. The ecological permeable pavement structure for collapsible loess green land according to claim 1, characterized in that: The bonding layer is a permeable mortar (8), the permeable surface layer is a permeable concrete brick (9), a grate plate (91) is installed on the permeable concrete brick (9) directly above the drainage ditch (32), and coral stone or gravel is arranged inside the drainage ditch (32).

6. A construction method for an ecological permeable pavement structure in collapsible loess green space as claimed in claim 1, characterized in that: The steps include: Excavating and treating the foundation pit, and compacting the raw soil rolling layer (1); Laying the lime soil base (2); pouring reinforced concrete layer (3); Installing finished drainage ditch (32); Laying of drainage layer (4); Laying a sand-free macroporous concrete cushion layer (5); Laying of infiltration pipes (6); Lay the bonding layer and permeable surface layer.

7. The construction method of the ecological permeable pavement structure for collapsible loess green space according to claim 6, characterized in that: During the process of excavating and treating the foundation pit, the compaction degree of the plain soil rolling layer (1) is greater than or equal to 0.93, and a ring knife sampling test is performed on the bulk density of the compacted soil.

8. The construction method of the ecological permeable pavement structure for collapsible loess green space according to claim 6 or 7, characterized in that: During the pouring of the reinforced concrete layer (3), the steel bars are required to be firmly tied and premixed concrete is selected. The pouring method is continuous pouring and block pouring. The joints need to be treated as construction joints and manual and vibrating methods are used to ensure that the concrete is dense and the surface is smooth.

9. The construction method of the ecological permeable pavement structure for collapsible loess green space according to claim 8, characterized in that: During the installation of the finished drainage ditch (32), drainage ditches (32) of different specifications are set in combination with the overall sponge requirements of the park. A pipe hole (61) is opened on the side of the drainage ditch (32) close to the road, and the pipe hole (61) is used for the penetration pipe (6) to pass through. During the laying of the drainage layer (4), the drainage boards (41) are tightly overlapped and fastened with each other, and an anti-filtration geotextile (42) and a medium sand filter layer (43) are laid above the drainage boards (41).

10. According to the construction method of ecological permeable pavement structure for collapsible loess green space as described in claim 6, during the process of laying the infiltration pipe (6), the outside of the infiltration pipe (6) is wrapped with non-woven fabric, and the infiltration pipe (6) is placed according to the designed drainage slope, with the middle of the infiltration pipe (6) being high and the two ends being low.

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