CN111364699A - Roof greening drainage structure and construction method thereof - Google Patents

Abstract

The invention relates to a roof greening drainage structure and a construction method thereof, relates to the technical field of roof drainage, and is used for solving the problem of water and soil loss caused in a roof greening drainage process; one end of the drainage groove is blocked, a water storage tank communicated with the drainage groove is arranged at the other end of the drainage groove on the roof, a filter box is detachably mounted at one end of the drainage groove close to the water storage tank, and the upper end of the filter box is opened and is lower than the bottom of the drainage groove; the stone slab has been laid along the length direction of water drainage tank above the water drainage tank, is provided with the adjustment mechanism who is used for going up and down the rose box between rose box and the water drainage tank. Through adopting above-mentioned technical scheme, be favorable to pouring sedimentary earth in the rose box into the loam layer again.

Description

Roof greening drainage structure and construction method thereof

Technical Field

The invention relates to the technical field of roof drainage, in particular to a roof greening drainage structure and a construction method thereof.

Background

At present, roof greening can be widely understood as a general name for planting trees and flowers on roofs, terraces, balcony, balconies or large artificial rockery of various ancient and modern buildings, structures, city walls, bridges (overpasses) and the like. The existence of roof greening improves the air environment in cities and beautifies the cities.

The existing roof greening waterproof or drainage structure, such as the chinese patent with publication number CN204888131U, comprises a structural shell, a shelf, a water storage layer, a drainage plate, a sandstone layer, a backfill soil layer, a water outlet, a water pump, a water pipe, and a water spray head; a shelf is arranged in the structure shell, a water storage layer is arranged at the lower part of the shelf, a water drainage plate is arranged at the upper part of the shelf, a sandstone layer is arranged at the upper part of the water drainage plate, and a backfill soil layer is arranged at the upper part of the sandstone layer; one side of the water storage layer is provided with a water outlet, a water pump is connected to the water outlet, and the other end of the water pump is connected with a water pipe. The greening layer is drained through the drainage plate and the shelf, and the water seepage is recycled and watered again through the water pump and the water pipe.

The above prior art solutions have the following drawbacks: because the greening structure of roof is including the loam layer that is used for planting the vegetation, when watering and drainage to roof greening, the loam layer easily runs off under the rivers effect for soil fertility descends, leads to vegetation growth situation on the roof greening structure to descend, and the soil and water that runs off also leads to the condition that drainage structures stopped up easily simultaneously, consequently has the improvement space.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a roof greening drainage structure which has the functions of draining water for roof greening and reducing root rot of plants, and reduces the condition of water and soil loss in the drainage process; one of the objectives of the present invention is to provide a construction method of a roof greening drainage structure, which has the function of reducing water and soil loss during drainage of the roof greening structure.

The above object of the present invention is achieved by the following technical solutions:

a roof greening drainage structure comprises a greening layer arranged above a roof and a drainage groove formed in the roof, wherein the greening layer comprises a partition plate layer provided with a plurality of through holes, a geotextile layer, a filter layer and a mud layer for planting vegetation from bottom to top, and a plurality of supporting columns for supporting the partition plate layer are arranged between the partition plate layer and the roof; one end of the drainage groove is blocked, a water storage tank communicated with the drainage groove is arranged at the other end of the drainage groove on the roof, a filter box is detachably mounted at one end, close to the water storage tank, of the drainage groove, and the upper end of the filter box is opened and is lower than the bottom of the drainage groove; a stone slab is laid above the drainage groove along the length direction of the drainage groove, and an adjusting mechanism used for lifting the filter box is arranged between the filter box and the drainage groove.

Through adopting above-mentioned technical scheme, the baffle layer cooperation through support column and rigidity separates greening layer and roof to after the vegetation waters, unnecessary moisture that can't be remain among the mud layer oozes to the roof in the through-hole on baffle layer, and in following the roof up end flow in the water drainage tank. One end of the drainage groove is communicated with a water storage tank, and the seeped irrigation water flows into the water storage tank along the drainage groove to be stored for utilization. Wherein the water drainage tank is close to the one end demountable installation of storage water tank and has the rose box, filters the infiltration that water drainage tank flowed into in the storage water tank through the rose box to hold back the soil that runs off in the infiltration, thereby after watering a period, can take out the soil of holding back in the rose box and pour into and recycle in the soil horizon, and this part earth has higher fertility, has better growth promotion effect to the vegetation in the afforestation layer. Wherein soil accumulates on the roof easily along with oozing of moisture when watering, and the setting up convenient to use person of support column can adopt instruments such as spray gun to wash the clearance between greening layer and the roof, will silt up in the deposit soil of roof terminal surface is cleared out to the water drainage tank, and then saves in the filter box, is favorable to retrieving the soil that runs off, compares the current mode through pipeline drainage and has reduced the stifled condition of pipeline silt. Wherein the stone slab is used for covering the drainage channel and allowing pedestrians to walk and view. Because the position of rose box is less than the up end of slabstone, goes up and down to the rose box through adjustment mechanism, be favorable to the user to be the rose box promotion and take out the back with the rose box on the slabstone, be convenient for pour sedimentary earth in the rose box into again in the mud layer. The whole structure has the functions of draining water and reducing rotten roots of plants for roof greening, and reduces the condition of water and soil loss in the drainage process, thereby being more favorable for the growth of vegetation.

The present invention in a preferred example may be further configured to: the drainage groove comprises two groups of side walls which are perpendicular to the plane where the roof is located and extend along the length direction of the drainage groove, a plurality of drainage holes which are flush with the roof are arranged on the side walls at intervals, and the lower end face of the stone plate is abutted to the upper end face of the side walls.

Through adopting above-mentioned technical scheme, be fixed with the lateral wall in water drainage tank both sides, lateral wall up end is higher than the roof and keeps apart the dirt bed, and the wash port on the lateral wall is used for supplying infiltration entering water drainage tank on the roof, and the lateral wall is used for supporting the slabstone, makes the slabstone have better support ability.

The present invention in a preferred example may be further configured to: the adjusting mechanism comprises a screw rod rotationally connected with the roof and a guide rod fixed with the roof, and the screw rod and the guide rod are both vertical to the plane of the roof; the screw rod and the guide rod are jointly sleeved with a support block in a sliding mode, the support block is in threaded connection with the screw rod, the filter box is connected with the support block in a clamping mode, the length of the screw rod and the length of the guide rod meet the requirement that when the support block moves to the lower limit position, the support block is lower than the bottom of the drainage groove, and when the support block moves to the upper limit position, the upper end face of the filter box is flush with the stone slab.

Through adopting above-mentioned technical scheme, the supporting shoe with screw rod threaded connection just with the guide bar cup joint slip to when the screw rod rotates, the supporting shoe is along screw rod up-and-down motion under the circumference limiting displacement of guide bar. The filter box is clamped with the supporting block, so that the filter box and the supporting block are convenient to detach. Wherein the length of screw rod and guide bar can satisfy the supporting shoe and move to the tank bottom that is less than water drainage tank and with two states of slabstone parallel and level to make the filter frame can filter and be convenient for take.

The present invention in a preferred example may be further configured to: the filter box comprises a rectangular frame and filter screens fixed on four side faces and the bottom face of the frame, a T-shaped groove is formed in one side, away from the water drainage groove, of the supporting block, the upper end of the T-shaped groove penetrates through the upper end face of the supporting block, a T-shaped block matched with the T-shaped groove is fixed to the protruding portion of the filter frame, and the T-shaped block is matched with the T-shaped groove in a clamping mode.

Through adopting above-mentioned technical scheme, the rose box passes through T type piece and T type groove and supporting shoe joint support, and frame construction makes the filter frame have certain supporting capacity, can bear the earth after holding back betterly.

The present invention in a preferred example may be further configured to: the filter box is characterized in that a holding-back box is fixed at a position close to the drainage groove in the filter box, filter holes are formed in the side wall of the holding-back box, and the filter precision of the filter screen is smaller than that of the holding-back box.

Through adopting above-mentioned technical scheme, wherein still be provided with in the rose box and hold back the case, the filter fineness who holds back the case is greater than the filter fineness of filter screen, and the cooperation through holding back case and filter screen is seeped water and is carried out twice filtration in to the water drainage tank to be favorable to holding back more earth in holding back the case, be convenient for empty earth and wash the rose box.

The present invention in a preferred example may be further configured to: the drainage channel is located the afforestation layer middle part, the roof upper end face to the drainage channel direction slope, the tank bottom of drainage channel to filter equipment direction slope.

Through adopting above-mentioned technical scheme, incline the roof up end to the water drainage tank direction to set up the tank bottom of water drainage tank for inclining to filter equipment direction, thereby be favorable to carrying out the water conservancy diversion to rivers and mud, the rivers of being convenient for flow.

The present invention in a preferred example may be further configured to: the bottom of the drainage groove is fixedly provided with a plurality of vertical stand columns, the stand columns are arranged along the length direction of the drainage groove, and the upper end faces of the stand columns are abutted to the lower end face of the stone plate.

Through adopting above-mentioned technical scheme, the setting of stand has improved the supporting role to the slabstone, makes the better load effect of slabstone again.

The present invention in a preferred example may be further configured to: the water storage tank is internally provided with a water pump, a water inlet of the water pump is communicated with the water storage tank, a water outlet of the water pump is communicated with a water supply pipe, the water supply pipe is embedded in the soil layer, and the water supply pipe is communicated with a plurality of rotary spray heads along the length direction.

Through adopting above-mentioned technical scheme, utilize the synergism of water pump and delivery pipe, reuse the waste water in the water storage tank, the delivery pipe is buried underground and is kept holistic pleasing to the eye in dirt bed to water the vegetation through the rotatory shower nozzle with the delivery pipe intercommunication, this structure is favorable to improving the utilization to watering, and also can collect the rainwater when the rainfall, thereby be favorable to improving the utilization to the water resource, more green.

A construction method for the roof greening drainage structure comprises the following steps:

the method comprises the following steps: the roof is provided with a water drainage tank and a water storage tank, the water drainage tank is arranged in the middle of the roof, and an opening is arranged above the water storage tank and is lower than the water outlet end of the water drainage tank;

step two: the renovation roof and the drainage groove form a drainage angle, the groove bottom of the drainage groove is provided with a 1-degree inclined plane towards the water storage tank, and the upper surface of the roof is provided with a 1-degree inclined plane towards the drainage groove;

step three: installing side walls, fixing the two groups of side walls in the drainage grooves, and arranging a plurality of drainage holes on the side walls, wherein the drainage holes are flush with the upper end surface of the roof;

step four: paving a greening layer, fixing support columns in matrix arrangement on the upper end faces of the roofs on two sides of the drainage channel, and paving a rigid partition plate layer provided with a plurality of through holes, a geotextile layer, a filter layer and a soil layer for planting vegetation on the upper end faces of the support columns in sequence;

step five: installing an adjusting mechanism and a filter box, rotatably connecting a screw rod of the adjusting mechanism with a roof, fixedly connecting a guide rod of the adjusting mechanism with the roof, connecting a supporting block of the adjusting mechanism with the screw rod in a threaded manner, slidably sleeving the guide rod, and clamping the filter box with the supporting block;

step six: paving a stone slab, fixing a plurality of stand columns at the bottom of the drainage groove, enabling the upper end surface of the decorative plate to be flush with the upper end surface of the soil layer, and enabling the lower end surface of the decorative plate to be abutted against the stand columns and the side walls;

the fourth step and the fifth step can be carried out simultaneously or not in sequence.

Through adopting above-mentioned technical scheme, water drainage tank and storage water tank can be through having driven or the mode of additionally setting up at the roof and construct, form the low-angle inclined plane and be favorable to rivers to flow at roof and water drainage tank bottom surface. Then the installation height is higher than the lateral wall on roof, and the lateral wall is used for separating the afforestation layer and is the region of difference except being used for carrying out the effect that supports to slabstone to separate division board layer, geotechnological cloth layer, filter layer and loam layer, thereby when installing the afforestation layer, the loam layer is difficult for shifting. Install adjustment mechanism and rose box earlier before laying the slabstone again, realize the lift of rose box through the synergism of screw rod and guide bar to be favorable to adjusting the height and the user state of rose box. At last, the vertical columns are paved in the drainage grooves, and the stone slabs are supported through the vertical columns and the side walls, so that the bearing capacity of the stone slabs is improved, and a user can trample and watch the stone slabs.

In conclusion, the invention has the following beneficial effects:

1. the green ring layer and the roof are separated by arranging the support columns for supporting the partition layer between the partition layer and the roof, and the drainage grooves are formed in the roof, so that the collection of water and lost soil seeped after irrigation is facilitated, the filtration is performed through the filter box, the lost soil is collected and then poured into a mud layer again for recycling, the water and soil loss of roof greening is reduced, the condition that roots of vegetation are rotten due to the fact that the mud layer is soaked for a long time is avoided, and the vegetation growth condition of the roof greening is better under the matching of multiple effects;

2. the filter box is arranged at one end, close to the water storage tank, of the drainage tank, so that soil in seepage water is intercepted, and a user can conveniently adjust the height position of the filter box on the stone plate through the adjusting mechanism, so that the requirement that the filter box is positioned below the drainage tank to filter seepage water is met, and meanwhile, the user can conveniently lift the filter box, and the filter box is convenient to take and use;

3. the filtered seepage water is collected by the water storage tank, and the seepage water in the water storage tank is sprayed again through the water pump and the water supply pipe, so that the utilization rate of water resources is improved, the rainwater can be collected and recycled, the green effect is achieved, the environment is friendly, and the economic value and the social value are high.

Drawings

FIG. 1 is a schematic view of the overall structure of the present embodiment;

FIG. 2 is a schematic structural view of a filter box according to the present embodiment;

FIG. 3 is an enlarged view taken at A in FIG. 2;

FIG. 4 is an enlarged view at B in FIG. 3;

FIG. 5 is a schematic view of another angle structure of the filtering box of this embodiment;

fig. 6 is an enlarged view at C in fig. 5.

Reference numerals: 1. a roof; 2. a greening layer; 21. a separator layer; 22. a geotextile layer; 23. a filter layer; 24. a layer of clay; 25. a support pillar; 3. a water discharge tank; 31. a water storage tank; 311. an overflow pipe; 32. a stone slab; 33. a side wall; 34. a drain hole; 35. a column; 4. a filter box; 41. a frame; 42. a filter screen; 43. a T-shaped block; 44. a retention tank; 51. a screw; 52. a guide bar; 53. a support block; 54. a T-shaped groove; 6. a water pump; 61. a water supply pipe; 62. the spray head is rotated.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

As shown in fig. 1 to 2, the roof greening drainage structure disclosed by the invention comprises a greening layer 2 arranged above a roof 1 and a drainage channel 3 (shown in fig. 3) arranged on the upper end surface of the roof 1, wherein a partition plate layer 21 (shown in fig. 6) provided with a plurality of through holes, a geotextile layer 22, a filter layer 23 and a mud layer 24 for planting vegetation are laid on the greening layer 2 from bottom to top at one time, and the partition plate layer 21 has certain rigidity and can be selected from a plastic plate and the like after concrete pouring. A plurality of support columns 25 (shown in fig. 5) for supporting the separator layer 21 are fixed between the separator layer 21 and the roof 1, and the support columns 25 are arranged in a matrix on the roof 1. Wherein water drainage tank 3 is located 1 middle part on roof, separates for two parts with afforestation layer 2, and the upper end on roof 1 sets up to water drainage tank 3 direction slope 1 to be convenient for moisture and earth etc. that soil layer 24 oozed along 1 water conservancy diversion on roof to water drainage tank 3 in.

Wherein 3 one ends shutoff of water drainage tank, roof 1 offer the storage water tank 31 with water drainage tank 3 intercommunication at the water drainage tank 3 other end, and storage water tank 31 one side intercommunication has overflow pipe 311, and water flows out from overflow pipe 311 when the surface of water reaches a take the altitude, and the overflow pipe 311 other end can communicate with municipal administration sewer pipe. Drain tank 3 is close to the one end demountable installation of storage water tank 31 has rose box 4, and 4 upper end openings of rose box are less than drain tank 3's tank bottom to filter the rivers that flow into storage water tank 31 in drain tank 3 through rose box 4, hold back the earth of loss. The water storage tank 31 is provided with a water pump 6, the water inlet of the water pump 6 is communicated with the water storage tank 31, the water outlet of the water pump 6 is communicated with a water supply pipe 61, the water supply pipe 61 is embedded in the soil layer 24, and the water supply pipe 61 is communicated with a plurality of rotary nozzles 62 extending out of the upper end surface of the soil layer 24 along the length direction.

As shown in fig. 3 to 4, the drainage channel 3 includes two sets of side walls 33 perpendicular to the plane of the roof 1 and extending along the length direction of the drainage channel 3, the side walls 33 are arranged on two sides of the drainage channel 3 along the length direction, the upper end surface of the side wall 33 is higher than the upper end surface of the roof 1, a plurality of drainage holes 34 aligned with the upper end surface of the roof 1 are spaced on the side walls 33, and seepage water on the roof 1 enters the drainage channel 3 from the drainage holes 34. A plurality of vertical upright columns 35 are fixed at the bottom of the drainage groove 3, and the upright columns 35 are arranged along the length direction of the drainage groove 3. Stone slab 32 has been laid along the length direction of water drainage tank 3 above water drainage tank 3, and the up end of stand 35 and the lower terminal surface butt of stone slab 32, the up end butt of the lower terminal surface of stone slab 32 and lateral wall 33 support stone slab 32 jointly through stand 35 and lateral wall 33, improve stone slab 32's bearing capacity.

As shown in fig. 3 to 4, an adjusting mechanism for lifting the filter box 4 is arranged between the filter box 4 and the drainage channel 3, the adjusting mechanism comprises a screw rod 51 rotatably connected with the roof 1 and a guide rod 52 fixed with the roof 1, wherein the top end of the screw rod 51 extends out of the stone plate 32 and is coaxially rotated with a hand wheel, and the screw rod 51 and the guide rod 52 are both vertical to the plane of the roof 1; the screw 51 and the guide rod 52 are jointly sleeved and slidably provided with a rectangular supporting block 53, the supporting block 53 is in threaded connection with the screw 51, and the supporting block 53 is in sliding connection with the guide rod 52. The filter box 4 and the supporting block 53 are clamped, the length of the screw 51 and the length of the guide rod 52 are set to be lower than the bottom of the drainage groove 3 when the supporting block 53 moves to the lower limit position, and the upper end face of the filter box 4 is flush with the stone plate 32 when the supporting block 53 moves to the upper limit position.

As shown in fig. 3 to 4, the filter box 4 includes a rectangular frame 41 and filter screens 42 fixed on four side surfaces and bottom surfaces of the frame 41, a T-shaped groove 54 vertically arranged in the length direction is formed in one side of the support block 53 away from the drainage groove 3, the upper end of the T-shaped groove 54 penetrates through the upper end surface of the support block 53, a T-shaped block 43 matched with the T-shaped groove 54 is fixed in a protruding manner on the filter frame, and the T-shaped block 43 is in clamping fit with the T-shaped groove 54. The position that is close to water drainage tank 3 in rose box 4 is fixed with and holds back case 44, and the lateral wall 33 that holds back case 44 has all seted up the filtration pore, and the filter fineness of filter screen 42 is less than the filter fineness who holds back case 44. Thereby make the earth that the infiltration runs off hold back more in holding back case 44, and then convenient to use person pours out the earth that holds back in with rose box 4 to among the soil layer 24, realizes reducing the circumstances that leads to soil erosion and water loss at the drainage in-process, more is favorable to the growth of vegetation.

The implementation principle of the embodiment is as follows:

this 1 afforestation drainage structures on roof waters the vegetation on afforestation layer 2 in the in-process that uses, and the moisture in the mud layer 24 passes filter layer 23, geotechnological cloth layer 22 and baffle layer 21 in proper order under the action of gravity after the watering, wherein can adopt current non-woven fabrics to lay and form, and geotechnological cloth and the cooperation of filter layer 23 further reduce earth and ooze from the through-hole of baffle, still has some earth to follow rivers and run off to 1 up end on roof and water conservancy diversion to water drainage tank 3 in still. Rivers and earth in the water drainage tank 3 flow to storage water tank 31 direction, and fall into rose box 4, hold back earth through rose box 4, after straining futilely, the user can rotate screw rod 51 and rise rose box 4 to slabstone 32 height, then relieve the joint between rose box 4 and supporting shoe 53, the realization is taken out rose box 4, and can pour the mud that strains futilely in the rose box 4 into soil layer 24 again, realize firm soil, thereby the circumstances of soil erosion and water loss when realizing reducing 1 afforestation structure drainage on roof.

A construction method of a roof greening drainage structure comprises the following steps:

the method comprises the following steps: a water drainage tank 3 and a water storage tank 31 are arranged on the roof 1, the water drainage tank 3 is arranged in the middle of the roof 1, an opening is formed above the water storage tank 31, and the opening is lower than the water outlet end of the water drainage tank 3;

step two: the renovation roof 1 and the drainage channel 3 form a drainage angle, the bottom of the drainage channel 3 is provided with an inclined plane of 1 degree towards the water storage tank 31, and the upper surface of the roof 1 is provided with an inclined plane of 1 degree towards the drainage channel 3;

step three: installing side walls 33, fixing the two groups of side walls 33 in the drainage channel 3, and forming a plurality of drainage holes 34 on the side walls 33, wherein the drainage holes are flush with the upper end surface of the roof 1;

step four: paving a greening layer 2, fixing support columns 25 which are arranged in a matrix manner on the upper end faces of the roofs 1 on two sides of the drainage channel 3, and paving a rigid partition plate layer 21 provided with a plurality of through holes, a geotextile layer 22, a filter screen 42 layer and a soil layer 24 for planting vegetation on the upper end faces of the support columns 25 in sequence;

step five: installing an adjusting mechanism and a filter box 4, rotatably connecting a screw 51 of the adjusting mechanism with the roof 1, fixedly connecting a guide rod 52 of the adjusting mechanism with the roof 1, connecting a supporting block 53 of the adjusting mechanism with the screw 51 in a threaded manner and slidably sleeving the guide rod 52, and clamping the filter box 4 with the supporting block 53;

step six: paving a stone plate 32, fixing a plurality of upright posts 35 at the bottom of the drainage groove 3, enabling the upper end surface of the decorative plate to be flush with the upper end surface of the soil layer 24, and enabling the lower end surface of the decorative plate to be abutted against the upright posts 35 and the side wall 33;

wherein, the step four and the step five can be carried out simultaneously or not in sequence.

The drainage channel 3 and the water storage tank 31 can be constructed in a mode of being completely opened or additionally erected on the roof 1, and a small-angle inclined surface is formed on the bottom surfaces of the roof 1 and the drainage channel 3, so that water flow is facilitated. The side walls 33 are then installed at a height higher than the roof 1, the side walls 33 serve to partition the greening layer 2 into different areas in addition to the function of supporting the slates 32, and partition the partition layers 21, the geotextile layers 22, the filter layers 23, and the soil layers 24, so that the soil layers 24 are not easily displaced when the greening layer 2 is installed. Before the stone plates 32 are laid, the adjusting mechanism and the filter box 4 are installed, and the filter box 4 is lifted and lowered through the synergistic effect of the screw 51 and the guide rod 52, so that the height and the using state of the filter box 4 can be adjusted. Finally, the upright post 35 is laid in the drainage groove 3, and the stone plate 32 is supported by the upright post 35 and the side wall 33 at the same time, so that the bearing capacity of the stone plate 32 is improved, and a user can step on the stone plate for watching.

The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims (9)

1. A roof greening drainage structure is characterized in that: the greening layer comprises a greening layer (2) arranged above a roof (1) and a drainage channel (3) arranged on the roof (1), wherein the greening layer (2) comprises a partition plate layer (21) provided with a plurality of through holes, a geotextile layer (22), a filter layer (23) and a mud layer (24) for planting vegetation from bottom to top, and a plurality of supporting columns (25) for supporting the partition plate layer (21) are arranged between the partition plate layer (21) and the roof (1); one end of the drainage groove (3) is blocked, a water storage tank (31) communicated with the drainage groove (3) is arranged at the other end of the drainage groove (3) on the roof (1), a filter box (4) is detachably mounted at one end, close to the water storage tank (31), of the drainage groove (3), and the upper end of the filter box (4) is opened and is lower than the bottom of the drainage groove (3); flagstone (32) have been laid along the length direction of water drainage tank (3) above water drainage tank (3), rose box (4) with be provided with between water drainage tank (3) and be used for going up and down the adjustment mechanism of rose box (4).

2. A roof greening drainage structure as claimed in claim 1, wherein: the drainage groove (3) comprises two groups of side walls (33) which are perpendicular to the plane where the roof (1) is located and extend along the length direction of the drainage groove (3), a plurality of drainage holes (34) which are flush with the roof (1) are formed in the side walls (33) at intervals, and the lower end face of the stone plate (32) is abutted to the upper end face of the side walls (33).

3. A roof greening drainage structure as claimed in claim 2, wherein: the adjusting mechanism comprises a screw rod (51) rotationally connected with the roof (1) and a guide rod (52) fixed with the roof (1), and the screw rod (51) and the guide rod (52) are both vertical to the plane of the roof (1); the screw rod (51) and the guide rod (52) are jointly sleeved with a supporting block (53) in a sliding mode, the supporting block (53) is in threaded connection with the screw rod (51), the filter box (4) is clamped with the supporting block (53), the lengths of the screw rod (51) and the guide rod (52) meet the requirement that when the supporting block (53) moves to the lower limit position, the length of the supporting block is lower than the bottom of the drainage groove (3), and when the supporting block (53) moves to the upper limit position, the upper end face of the filter box (4) is flush with the stone plate (32).

4. A roof greening drainage structure as claimed in claim 3, wherein: the filter box (4) comprises a rectangular frame (41) and filter screens (42) fixed to four side faces and the bottom face of the frame (41), a T-shaped groove (54) is formed in one side, away from the drainage groove (3), of the supporting block (53), the upper end of the T-shaped groove (54) penetrates through the upper end face of the supporting block (53), a T-shaped block (43) matched with the T-shaped groove (54) is fixed to the filter frame in a protruding mode, and the T-shaped block (43) is matched with the T-shaped groove (54) in a clamping mode.

5. A roof greening drainage structure as claimed in claim 1, wherein: the position that is close to water drainage tank (3) in rose box (4) is fixed with and holds back case (44), the filter hole has all been seted up in lateral wall (33) of holding back case (44), the filter fineness of filter screen (42) is less than the filter fineness of holding back case (44).

6. A roof greening drainage structure as claimed in claim 1, wherein: drainage tank (3) are located greening layer (2) middle part, roof (1) up end to drainage tank (3) direction slope, the tank bottom of drainage tank (3) to the filter equipment direction slope.

7. A roof greening drainage structure as claimed in claim 1, wherein: the tank bottom of water drainage tank (3) is fixed with a plurality of vertical stands (35), stand (35) are followed the length direction of water drainage tank (3) arranges, the up end of stand (35) with the lower terminal surface butt of slabstone (32).

8. A roof greening drainage structure as claimed in claim 1, wherein: the water storage tank (31) is internally provided with a water pump (6), a water inlet of the water pump (6) is communicated with the water storage tank (31), a water outlet of the water pump (6) is communicated with a water supply pipe (61), the water supply pipe (61) is embedded in the soil layer (24), and the water supply pipe (61) is communicated with a plurality of rotary nozzles (62) along the length direction.

9. A method of constructing a roof greening drainage structure as claimed in any one of claims 1 to 8, wherein the method comprises the steps of: the method comprises the following steps:

the method comprises the following steps: a drainage tank (3) and a water storage tank (31) are arranged on the roof (1), the drainage tank (3) is arranged in the middle of the roof (1), an opening is formed above the water storage tank (31), and the opening is lower than the water outlet end of the drainage tank (3);

step two: a drainage angle is formed between the renovated roof (1) and the drainage groove (3), a 1-degree inclined plane is arranged at the bottom of the drainage groove (3) towards the water storage tank (31), and a 1-degree inclined plane is arranged at the upper surface of the roof (1) towards the drainage groove (3);

step three: installing side walls (33), fixing the two groups of side walls (33) in the drainage groove (3), and arranging a plurality of drainage holes (34) on the side walls (33) to be flush with the upper end surface of the roof (1);

step four: paving a greening layer (2), fixing support columns (25) which are arranged in a matrix manner on the upper end surfaces of the roofs (1) on the two sides of the drainage tank (3), and paving a rigid partition plate layer (21) provided with a plurality of through holes, a geotextile layer (22), a filter layer (23) and a mud layer (24) for planting vegetation on the upper end surfaces of the support columns (25) in sequence;

step five: installing an adjusting mechanism and a filter box (4), rotatably connecting a screw rod (51) of the adjusting mechanism with the roof (1), fixedly connecting a guide rod (52) of the adjusting mechanism with the roof (1), connecting a supporting block (53) of the adjusting mechanism with the screw rod (51) in a threaded manner, slidably sleeving the guide rod (52), and clamping the filter box (4) with the supporting block (53);

step six: paving a stone plate (32), fixing a plurality of upright posts (35) at the bottom of the drainage groove (3), enabling the upper end surface of the decorative plate to be flush with the upper end surface of the soil layer (24), and enabling the lower end surface of the decorative plate to be abutted against the upright posts (35) and the side wall (33);

the fourth step and the fifth step can be carried out simultaneously or not in sequence.

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