Double-layer drainage ditch for green roof
By designing a double-layer drainage ditches system on the planting roof, and using blind ditches, porous bricks and other structures to introduce water on the roof into the drainage pipes, the problem of water in the planting soil being unable to be discharged in time is solved, the damage of the waterproof structure and the subsidence of the ground is prevented, and the safety and durability of the roof are improved.
Patent Information
- Application Number
- CN202421509635.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-27
- Publication Date
- 2025-04-08
- Estimated Expiration
- 2034-06-27
AI Technical Summary
The excess water stored in the planting soil in the planting roof cannot be discharged in time, resulting in problems such as waterproof structure damage, ground subsidence, roof leakage.
A double-layer drainage system is designed, including concrete roof panels, blind ditches, porous bricks, water filter packs, gravel layers and geotextiles, through these structures, water is introduced into outdoor drainage pipes to prevent water from being stored on the roof.
Effectively prevent the long-term storage of water in the planting soil, avoid damage to waterproof structures, reduce the risks of ground subsidence and roof leakage, and improve the safety and durability of roof structures.
Smart Images
Figure CN222730956U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of building construction, in particular to a double-layer drainage ditch on a planting roof. Background Art
[0002] Nowadays, in many residential constructions, underground garage roofs are generally designed as planted roofs for people to relax and entertain. The roof drainage method generally adopts ground scattered drainage plus (open / dark) drainage ditches to collect water into the outdoor drainage network and introduce it into the municipal drainage network. This method is basically effective in removing surface water, but the excess water stored in the planting (backfill) soil cannot be discharged in time. After being stored on the roof for a long time, the water will gradually damage the waterproof structure, causing ground subsidence and roof leakage, affecting the use. Over time, it will also cause the roof steel bars to rust, reducing the structural safety and durability. Therefore, we proposed a double-layer drainage ditch for the planted roof to solve the above problems. Utility Model Content
[0003] The utility model aims to provide a double-layer drainage ditch for a planting roof to solve the problem that the excess water stored in the planting soil cannot be discharged in time.
[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a double-layer drainage ditch for a planting roof, including a concrete roof panel, the concrete roof panel is used to carry the planting soil needed for the planting roof, a plurality of blind ditches are arranged on the concrete roof panel, the blind ditch includes porous bricks and a first cover plate, the porous bricks are symmetrically arranged on the surface of the concrete roof panel and piled up the left and right side walls of the blind ditch, and the holes of the porous bricks are perpendicular to the drainage direction of the blind ditch, the first cover plate is arranged on the top of the porous bricks, the outer wall of the blind ditch is wrapped with geotextile, and a water filter bag is arranged on the surface of the concrete roof panel, and the water filter bag is arranged on the two side walls of the blind ditch, the surface of the concrete roof panel is provided with a crushed stone layer, and the crushed stone layer is located on the left and right sides of the water filter bag, the surface of the water filter bag and the crushed stone layer is jointly paved with geotextile, the surface of the geotextile is paved with planting soil, and the blind ditch is connected to an outdoor drainage pipe.
[0005] The beneficial effects of this program are:
[0006] (1) By setting a blind ditch in the concrete roof panel, the water stored in the planting soil is discharged into the outdoor drainage pipe through the blind ditch, preventing the water stored in the planting soil from destroying the waterproof structure and causing ground subsidence and roof leakage.
[0007] (2) By stacking the left and right side walls of the blind ditch with porous bricks, water can flow through the holes of the porous bricks into the blind ditch and then be discharged into the outdoor drainage pipe. The geotextile wrapped around the outer wall of the blind ditch can prevent the planting soil from clogging the holes of the porous bricks. There are a large number of gaps inside the filter bag and the gravel layer, which cannot store water, thereby accelerating the discharge of water to protect the concrete panel. The geotextile laid on the surface of the filter bag and the gravel layer can prevent the planting soil from entering the filter bag and affecting the discharge of deposited water.
[0008] Preferably, as an improvement, an open ditch is provided in the planting soil, and the open ditch is located directly above the blind ditch, the open ditch includes a concrete slab, solid bricks and a second cover plate, the concrete slab is provided in the planting soil, the solid bricks are symmetrically provided on the surface of the concrete slab and piled up to form the left and right side walls of the open ditch, a smooth layer is provided on the inner wall and the top of the open ditch, the surface of the smooth layer is provided with a slope, the second cover plate is provided on the top of the solid bricks, and the second cover plate and the surface of the planting soil are on the same horizontal line, and the open ditch is connected to the outdoor drainage pipe.
[0009] The beneficial effects are: the open ditch is leveled by the concrete slab, the solid bricks can prevent the planting soil from entering the open ditch, the slope can guide the flow of water and speed up the speed of water discharge into the outdoor drainage pipe, and the smooth layer can prevent water from penetrating into the planting soil and causing erosion of the concrete roof panel.
[0010] Preferably, as an improvement, a seepage pipe is provided inside the blind ditch, a plurality of seepage holes are provided in a ring shape on the outer wall of the seepage pipe, and the outer side of the seepage pipe is wrapped with a pebble filter layer, a gravel filter layer and a coarse sand filter layer in sequence.
[0011] The beneficial effects are as follows: through the seepage holes opened on the outer wall of the seepage pipe, the moisture deposited on the concrete roof panel flows into the seepage pipe through the seepage holes, and then the seepage pipe discharges the moisture to the outdoor drainage pipe. The pebble filter layer, the gravel filter layer and the coarse sand filter layer are wrapped in sequence on the outside of the seepage pipe, which can increase the speed of moisture filtration, thereby isolating mud and sand. At the same time, the pebble filter layer, the gravel filter layer, the coarse sand filter layer and the seepage pipe can support the blind ditch and increase the strength of the blind ditch.
[0012] Preferably, as an improvement, the blind ditch is filled with a plurality of porous bricks, and the holes of the porous bricks are parallel to the drainage direction of the blind ditch.
[0013] The beneficial effect is: since the blind ditch is set at the bottom of the planting soil, porous bricks are filled inside to support the blind ditch, which can prevent the blind ditch from collapsing. At the same time, since the porous bricks themselves have holes, the method of filling the blind ditch with porous bricks is simple and low in cost without affecting drainage.
[0014] Preferably, as an improvement, a drainage board is provided on the outer wall of the joint of the seepage pipe, and the outer wall of the drainage board is wrapped with gauze.
[0015] The beneficial effects are: the drainage board is selected as a plastic drainage board, which has good strength and ductility, can adapt to the deformation capacity of the foundation without affecting the drainage performance of the seepage pipe, and can also prevent mud and sand from entering the inside of the seepage pipe through the joint of the seepage pipe, thereby preventing mud and sand from clogging the seepage holes of the seepage pipe. The gauze can further filter the mud and sand, thereby preventing the mud and sand from clogging the seepage holes.
[0016] Preferably, as an improvement, an open ditch is provided in the planting soil, and the open ditch is located directly above the blind ditch, the open ditch includes a concrete slab, a hollow brick and a third cover plate, the concrete slab is provided in the planting soil, a plurality of U-shaped tubes are symmetrically provided in the concrete slab, the two farthest ports of the symmetrically installed U-shaped tubes are provided with water pipes, the hollow bricks are symmetrically provided on the surface of the concrete slab and piled up to form the left and right side walls of the open ditch, and the water pipes are located in the holes of each hollow brick, the inner wall of the open ditch is provided with a smooth layer flush with the port of the U-shaped tube, the third cover plate is provided on the top of the hollow brick, a planting trough is provided on the surface of the third cover plate, a filter net is provided in the planting trough, a moisturizing layer is provided on the surface of the filter net, a plurality of cotton ropes are provided on the moisturizing layer, one end of the cotton rope is connected to the moisturizing layer, and the other end passes through the third cover plate and extends to the bottom of the U-shaped tube, planting soil is laid on the surface of the moisturizing layer, and the open ditch is connected to the outdoor drainage pipe.
[0017] The beneficial effects are as follows: by symmetrically arranging a number of U-shaped tubes in the concrete slab, a certain amount of water can be stored inside the U-shaped tube; a planting trough is provided on the surface of the third cover plate, and plants are planted in the planting trough, which can beautify the open ditch and increase the green coverage rate of the planting soil surface; a filter net is arranged in the planting trough to prevent planting soil and debris from entering the open ditch; since the planting trough contains less planting soil and has a poor water-locking effect, a moisturizing layer is laid on the filter net to increase the moisture in the planting soil; at the same time, the moisturizing layer is connected with a cotton rope, which is extended to the bottom of the U-shaped tube through the water pipe, so that the water stored at the bottom of the U-shaped tube is transferred to the moisturizing layer through the cotton rope, thereby maintaining the moisturizing layer in a moist state for a long time, and providing moisture for the plants in the planting trough.
[0018] Preferably, as an improvement, an open ditch is provided in the planting soil, and the open ditch is located directly above the blind ditch, the open ditch includes a concrete slab, solid bricks and a third cover plate, the concrete slab is provided in the planting soil, the solid bricks are symmetrically provided on the surface of the concrete slab and piled up to form the left and right side walls of the open ditch, a smooth layer is provided on the inner wall and the top of the open ditch, a wave slope is provided on the surface of the smooth layer, the third cover plate is provided on the top of the solid brick, a planting trough is provided on the surface of the third cover plate, a filter net is provided in the planting trough, a moisturizing layer is provided on the surface of the filter net, a plurality of cotton ropes are provided on the moisturizing layer, one end of the cotton rope is connected to the moisturizing layer, and the other end passes through the third cover plate and extends to the trough of the wave slope, planting soil is laid on the surface of the moisturizing layer, and the open ditch is connected to the outdoor drainage pipe.
[0019] The beneficial effects are as follows: a certain amount of water can be stored in the trough of the wave slope. A planting trough is provided on the surface of the third cover plate. Planting plants in the planting trough can beautify the open ditch and increase the green coverage rate of the planting soil surface. A filter net is arranged in the planting trough to prevent planting soil and debris from entering the open ditch. Since the planting soil content in the planting trough is small and the water locking effect is poor, a moisturizing layer is laid on the filter net to increase the moisture in the planting soil. At the same time, a cotton rope is connected to the moisturizing layer, and one end of the cotton rope is placed in the trough of the wave slope, so that the moisture stored in the trough of the wave slope is transported to the moisturizing layer through the cotton rope to provide moisture for the plants.
[0020] Preferably, as an improvement, the distance between the blind ditches is set to 15-20m.
[0021] The beneficial effect is: setting the distance of the blind ditch at 15-20m can not only maintain the drainage effect of the blind ditch, but also reduce the number of piled blind ditches and save construction costs.
[0022] Preferably, as an improvement, blind grooves are provided on both sides of the root of the expansion joint.
[0023] The beneficial effect is that adding blind trenches on both sides of the root of the expansion joint can reduce the time that water stays at the root of the expansion joint, thereby preventing the root of the expansion joint from being damaged and causing water leakage.
[0024] Preferably, as an improvement, both ports of each U-shaped tube are wrapped with a filter mesh.
[0025] The beneficial effect is that the filter screen can prevent sediment from entering the interior of the U-shaped pipe and then entering the open ditch to cause blockage. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present utility model;
[0027] Figure 2 This is a schematic diagram of the blind ditch structure of Example 2 of the utility model;
[0028] Figure 3 This is a schematic structural diagram of a water seepage pipe according to Embodiment 2 of the present utility model;
[0029] Figure 4 This is a schematic diagram of the blind ditch structure of Example 3 of the utility model;
[0030] Figure 5 This is a schematic diagram of the open channel structure of Example 4 of the utility model;
[0031] Figure 6 This is a schematic diagram of the open channel structure of Example 5 of the utility model. DETAILED DESCRIPTION
[0032] The following is further described in detail through specific implementation methods:
[0033] The figure marks in the drawings of the specification include: concrete roof panel 1, planting soil 2, porous bricks 3, first cover plate 4, geotextile 5, water filter bag 6, gravel layer 7, concrete plate 8, solid brick 9, second cover plate 10, slope 11, smooth layer 12, seepage pipe 13, seepage hole 14, pebble water filter layer 15, gravel water filter layer 16, coarse sand water filter layer 17, drainage board 18, hollow brick 19, third cover plate 20, U-shaped pipe 21, water pipe 22, planting trough 23, moisture retaining layer 24, cotton rope 25, wave slope 26.
[0034] Example 1
[0035] Embodiment 1 is basically as attached Figure 1 As shown, Figure 1 The double-layer drainage ditch of the planted roof shown includes a concrete roof panel 1, which includes a cast-in-place structural plate, a 1.5mm thick petroleum asphalt polyurethane waterproof coating layer, a 3mm thick self-adhesive waterproof membrane waterproof layer, a 15mm thick M5 mortar protective layer and a 40mm thick C20 fine stone concrete rigid waterproof layer from bottom to top. The concrete roof panel 1 is used to carry the planting soil 2 needed for the planted roof. A number of blind ditches are provided on the concrete roof panel 1, and the blind ditch slope is ≥2%. The distance between each blind ditch is set to 15-20m. Since water is easily accumulated at the root of the deformation joint, if water seepage occurs in the deformation joint, it will cause serious deformation or damage to the house structure. Therefore, additional blind ditches are added on both sides of the root of the deformation joint to prevent water seepage from the deformation joint. The blind ditch includes a porous brick 3 and a first cover plate 4. The specification of the porous brick 3 is 240*115*90mm. The porous brick 3 is symmetrically arranged on the surface of the concrete roof panel 1, and the left and right sides of the blind ditch are piled up with M5 cement mortar. The blind ditch has a wall, and the height of the side wall of the blind ditch is the sum of the widths of the four porous bricks 3. The distance between the symmetrically stacked porous bricks 3 is 300 mm. The holes of the porous bricks 3 are perpendicular to the drainage direction of the blind ditch. The first cover plate 4 is laid flat on the top of the porous bricks 3. The size of the first cover plate 4 is 700*500*100 mm. Of course, a 100 mm reinforced concrete slab can also be used as the first cover plate 4. The outer wall of the blind ditch is wrapped with a geotextile 5, and a filter bag is piled on the surface of the concrete roof panel 1. 6. The filter bag 6 is wrapped with stones, and the slope of the filter bag 6 is at an angle of 45° with the concrete roof panel 1, and is located on the left and right outer walls of the blind ditch. The surface of the concrete roof panel 1 is paved with a crushed stone layer 7, the thickness of the crushed stone layer 7 is 80 mm, the particle size of the crushed stone is 20-40 mm, and the crushed stone layer 7 is located on the left and right sides of the filter bag 6. The surface of the filter bag 6 and the crushed stone layer 7 is jointly paved with a geotextile 5, and the surface of the geotextile 5 is paved with planting soil 2. The blind ditch is connected to the outdoor drainage pipe.
[0036] An open ditch is provided in the planting soil 2, and the open ditch is located directly above the blind ditch. The open ditch includes a concrete slab 8, a solid brick 9 and a second cover plate 10. The concrete slab 8 is provided in the planting soil 2, and the solid bricks 9 are symmetrically arranged on the surface of the concrete slab 8. The left and right side walls of the open ditch are piled up with M5 cement mortar, and the height of the side wall of the open ditch is the sum of the heights of 8 solid bricks 9. The size of the solid bricks 9 is 240*115*53mm, and the distance between the symmetrically stacked solid bricks 9 is 250mm. A slope 11 is provided at the bottom of the open ditch, and the inclination angle of the slope 11 is 5-10°. A smooth layer 12 is provided on the inner wall and the top of the open ditch. The second cover plate 10 is laid on the top of the solid brick 9. The size of the second cover plate 10 is 700*500*100mm, and the second cover plate 10 is located on the same horizontal line as the surface of the planting soil 2. The open ditch is connected to the outdoor drainage pipe.
[0037] The specific implementation process is as follows:
[0038] When it rains heavily, part of the rainwater flows into the open ditch through the second cover plate 10 and is discharged into the outdoor drainage pipe from the open ditch, while the other part of the rainwater remains in the planting soil 2. At this time, the rainwater passes through the geotextile 5 and enters the gravel layer 7 and the water filter bag 6. The gravel layer 7 and the water filter bag 6 filter the gravel in the rainwater. Since the blind ditch is set on a certain slope, the rainwater passes through the geotextile 5 wrapped on the outside of the blind ditch, and then enters the inside of the blind ditch through the holes of the porous bricks 3. The blind ditch discharges the rainwater deposited on the concrete roof panel 1 to the outdoor drainage pipe, thereby preventing the rainwater from being stored on the concrete roof panel 1 for a long time to damage the waterproof structure, thereby preventing defects such as ground subsidence and roof leakage, and increasing the safety and durability of the structure.
[0039] Example 2
[0040] The principle of embodiment 2 is roughly the same as that of embodiment 1, except that: Figure 2 As shown, a seepage pipe 13 is provided inside the blind ditch, and the outside of the seepage pipe 13 is wrapped with a pebble filter layer 15, a gravel filter layer 16 and a coarse sand filter layer 17 in sequence. Figure 3 As shown, a plurality of seepage holes 14 are provided in a ring shape on the outer wall of the seepage pipe 13, and a drainage board 18 is wrapped on the outer wall of the joint of the seepage pipe 13. The outer wall of the drainage board 18 is wrapped with gauze and is tightened with No. 20 galvanized iron wire. The drainage board 18 is a plastic drainage board, which has good strength and ductility, and can adapt to the deformation of the foundation without affecting the drainage performance of the seepage pipe 13. At the same time, it can prevent mud and sand from entering the inside of the seepage pipe 13 through the joint of the seepage pipe 13, thereby preventing mud and sand from clogging the seepage holes 14 of the seepage pipe 13. The gauze can further filter the mud and sand, thereby preventing the mud and sand from clogging the seepage holes 14.
[0041] Through the seepage holes 14 opened on the outer wall of the seepage pipe 13, the water deposited on the concrete roof panel 1 flows into the seepage pipe 13 through the seepage holes 14, and then the seepage pipe 13 discharges the water to the outdoor drainage pipe. The pebble filter layer 15, the gravel filter layer 16 and the coarse sand filter layer 17 are wrapped in sequence on the outside of the seepage pipe 13, which can increase the speed of water filtration, thereby playing a role in isolating mud and sand. At the same time, the pebble filter layer 15, the gravel filter layer 16, the coarse sand filter layer 17 and the seepage pipe 13 can play a role in supporting the blind ditch and increase the strength of the blind ditch.
[0042] Example 3
[0043] The principle of embodiment 3 is roughly the same as that of embodiment 1, except that: Figure 4 As shown, a plurality of porous bricks 3 are filled inside the blind ditch, and the holes of the porous bricks 3 are parallel to the drainage direction of the blind ditch.
[0044] Since the blind ditch is set at the bottom of the planting soil 2, porous bricks 3 are filled inside to support the blind ditch, which can prevent the blind ditch from collapsing. At the same time, since the porous bricks 3 have holes themselves, the method of filling the blind ditch with porous bricks 3 is simple and low in cost without affecting drainage.
[0045] Example 4
[0046] The principle of embodiment 4 is roughly the same as that of embodiment 1, except that: Figure 5 As shown, the open ditch includes a concrete plate 8, a hollow brick 19 and a third cover plate 20. The concrete plate 8 is arranged in the planting soil 2. A plurality of U-shaped pipes 21 are symmetrically arranged in the concrete plate 8. The two farthest ports of the symmetrically installed U-shaped pipes 21 are both provided with water pipes 22. The hollow bricks 19 are symmetrically arranged on the surface of the concrete plate 8 and are stacked to form the left and right side walls of the open ditch. The water pipes 22 are all located in the holes of each hollow brick 19. The hollow bricks 19 are set as two-hole hollow bricks 19, and the specifications are 390*190*190mm. The inner wall of the open ditch is provided with a U-shaped pipe 21. The end of the U-shaped tube 21 is flush with the smooth layer 12, and the third cover plate 20 is arranged on the top of the hollow brick 19. The size of the third cover plate 20 is 800*700*100mm. A planting groove 23 is opened on the surface of the third cover plate 20, and a filter net is arranged in the planting groove 23. A moisturizing layer 24 is arranged on the surface of the filter net. The moisturizing layer 24 is provided with a plurality of cotton ropes 25. One end of the cotton rope 25 is connected to the moisturizing layer 24, and the other end passes through the third cover plate 20 and extends to the bottom of the U-shaped tube 21. Planting soil 2 is laid on the surface of the moisturizing layer 24, and the open ditch is connected to the outdoor drainage pipe.
[0047] By symmetrically arranging a number of U-shaped tubes 21 in the concrete slab 8, a certain amount of water can be stored inside the U-shaped tube 21. A planting groove 23 is opened on the surface of the third cover plate 20. Plants are planted in the planting groove 23, which can beautify the open ditch and increase the green coverage rate of the surface of the planting soil 2. A filter net is arranged in the planting groove 23 to prevent the planting soil 2 and debris from entering the open ditch. Since the planting soil 2 in the planting groove 23 has a small content and a poor water-locking effect, a moisturizing layer 24 is laid on the filter net to increase the moisture in the planting soil 2. At the same time, the moisturizing layer 24 is connected to the cotton rope 25, and the cotton rope 25 is extended to the bottom of the U-shaped tube 21 through the water pipe 22, so that the water stored at the bottom of the U-shaped tube 21 is transferred to the moisturizing layer 24 through the cotton rope 25, thereby maintaining the moisturizing layer 24 in a moist state for a long time, providing moisture for the plants in the planting groove 23.
[0048] Example 5
[0049] The principle of embodiment 5 is roughly the same as that of embodiment 4, except that: Figure 6 As shown, the hollow bricks 19 are replaced by solid bricks 9 , the U-shaped tube 21 is no longer arranged in the concrete slab 8 , and a wave slope 26 is arranged on the inner bottom surface of the open ditch, and the cotton rope 25 is extended to the trough of the wave slope 26 .
[0050] By arranging a wave slope 26 on the inner wall of the open ditch, the trough of the wave slope 26 can store a certain amount of water. A planting groove 23 is opened on the surface of the third cover plate 20. Planting plants in the planting groove 23 can beautify the open ditch and increase the green coverage rate of the surface of the planting soil 2. By arranging a filter net in the planting groove 23, the planting soil 2 and debris can be prevented from entering the open ditch. Since the planting soil 2 in the planting groove 23 has a small content and a poor water-locking effect, a moisturizing layer 24 is laid on the filter net to increase the moisture in the planting soil 2. At the same time, one end of the cotton rope 25 connected to the moisturizing layer 24 extends to the trough of the wave slope 26, so that the water stored in the trough of the wave slope 26 is transferred to the moisturizing layer 24 through the cotton rope 25, thereby maintaining the moisturizing layer 24 in a moist state for a long time, providing moisture for the plants in the planting groove 23;
[0051] At the same time, since the troughs of the wave slope 26 are arranged at equal distances, when the silt enters the open ditch, the silt will be dispersed to the troughs of each wave slope 26, so that the silt is divided into several small portions, thereby preventing a large amount of silt from piling up and blocking the open ditch. When water flows in the open ditch, the water flow impacts the silt accumulated in the trough under the height difference of the wave slope 26, so that the silt is discharged from the open ditch, which is easier to discharge from the open ditch than a large amount of silt piling up. The above is only an embodiment of the utility model, and the common sense such as the known specific technical schemes and / or characteristics in the scheme is not described too much here. It should be pointed out that for those skilled in the art, without departing from the technical scheme of the utility model, several deformations and improvements can be made, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The protection scope required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to explain the content of the claims.
Claims
1. The double-layer drainage ditch of the planted roof includes a concrete roof panel, which is used to carry the planting soil required for the planted roof, and is characterized by: A plurality of blind gutters are arranged on the concrete roof panel, and the blind gutters include porous bricks and a first cover plate. The porous bricks are symmetrically arranged on the surface of the concrete roof panel and are stacked to form left and right side walls of the blind ditch, and the holes of the porous bricks are perpendicular to the drainage direction of the blind ditch. The first cover plate is arranged on the top of the porous bricks. The outer wall of the blind ditch is wrapped with geotextile, and a water filter bag is arranged on the surface of the concrete roof panel, and the water filter bag is arranged on both side walls of the blind ditch. A crushed stone layer is arranged on the surface of the concrete roof panel, and the crushed stone layer is located on the left and right sides of the water filter bag. The surface of the water filter bag and the crushed stone layer is jointly paved with geotextile, and the surface of the geotextile is paved with planting soil, and the blind ditch is connected with an outdoor drainage pipe.
2. The double-layer drainage ditch for a green roof according to claim 1 is characterized by: An open ditch is provided in the planting soil, and the open ditch is located directly above the blind ditch. The open ditch includes a concrete slab, solid bricks and a second cover plate. The concrete slab is provided in the planting soil, and the solid bricks are symmetrically provided on the surface of the concrete slab and piled up to form the left and right side walls of the open ditch. A smooth layer is provided on the inner wall and the top of the open ditch, and a slope is provided on the surface of the smooth layer. The second cover plate is provided on the top of the solid bricks, and the second cover plate and the surface of the planting soil are on the same horizontal line. The open ditch is connected to the outdoor drainage pipe.
3. The double-layer drainage ditch for a green roof according to claim 1 is characterized by: A seepage pipe is arranged inside the blind ditch, a plurality of seepage holes are opened in a ring shape on the outer wall of the seepage pipe, and the outer side of the seepage pipe is wrapped with a pebble filter layer, a gravel filter layer and a coarse sand filter layer in sequence.
4. The double-layer drainage ditch for a green roof according to claim 1 is characterized by: The blind ditch is filled with a number of porous bricks, and the holes of the porous bricks are parallel to the drainage direction of the blind ditch.
5. The double-layer drainage ditch for a green roof according to claim 3 is characterized by: A drainage board is arranged on the outer wall of the joint of the seepage pipe, and the outer wall of the drainage board is wrapped with gauze.
6. The double-layer drainage ditch for a green roof according to claim 1 is characterized by: An open ditch is provided in the planting soil, and the open ditch is located directly above the blind ditch. The open ditch includes a concrete slab, a hollow brick and a third cover. The concrete slab is provided in the planting soil. A number of U-shaped tubes are symmetrically provided in the concrete slab. The two farthest ports of the symmetrically installed U-shaped tubes are provided with water pipes. The hollow bricks are symmetrically provided on the surface of the concrete slab and piled up to form the left and right side walls of the open ditch. The water pipes are located in the holes of each hollow brick. A smooth layer flush with the port of the U-shaped tube is provided on the inner wall of the open ditch. The third cover is provided on the top of the hollow brick. A planting trough is provided on the surface of the third cover. A filter net is provided in the planting trough. A moisturizing layer is provided on the surface of the filter net. A number of cotton ropes are provided on the moisturizing layer. One end of the cotton rope is connected to the moisturizing layer, and the other end passes through the third cover and extends to the bottom of the U-shaped tube. Planting soil is laid on the surface of the moisturizing layer, and the open ditch is connected to the outdoor drainage pipe.
7. The double-layer drainage ditch for a green roof according to claim 1 is characterized by: An open ditch is provided in the planting soil, and the open ditch is located directly above the blind ditch. The open ditch includes a concrete slab, solid bricks and a third cover plate. The concrete slab is provided in the planting soil, and the solid bricks are symmetrically provided on the surface of the concrete slab and piled up to form the left and right side walls of the open ditch. A smooth layer is provided on the inner wall and the top of the open ditch, and a wave slope is provided on the surface of the smooth layer. The third cover plate is provided on the top of the solid brick. A planting trough is provided on the surface of the third cover plate, and a filter net is provided in the planting trough. A moisturizing layer is provided on the surface of the filter net. The moisturizing layer is provided with several cotton ropes, one end of the cotton rope is connected to the moisturizing layer, and the other end passes through the third cover plate and extends to the trough of the wave slope. Planting soil is laid on the surface of the moisturizing layer, and the open ditch is connected to the outdoor drainage pipe.
8. The double-layer drainage ditch for a green roof according to claim 1 is characterized by: The distance between blind ditches is set to 15-20m.
9. The double-layer drainage ditch for a green roof according to claim 1 is characterized by: Blind trenches are added on both sides of the root of the expansion joint.
10. The double-layer drainage ditch for a green roof according to claim 6, characterized in that: Both ends of each U-shaped tube are wrapped with filter mesh.