CN115478527B - Drainage system - Google Patents
Drainage system Download PDFInfo
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- CN115478527B CN115478527B CN202211155094.0A CN202211155094A CN115478527B CN 115478527 B CN115478527 B CN 115478527B CN 202211155094 A CN202211155094 A CN 202211155094A CN 115478527 B CN115478527 B CN 115478527B
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- wall surface
- drainage
- water
- pipe body
- hydrophilic portion
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F3/00—Sewer pipe-line systems
- E03F3/04—Pipes or fittings specially adapted to sewers
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Paleontology (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Agronomy & Crop Science (AREA)
- Civil Engineering (AREA)
- Soil Sciences (AREA)
- Health & Medical Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Treatment Of Liquids With Adsorbents In General (AREA)
- Sewage (AREA)
Abstract
The drainage system of the present invention includes: a drainage area; the water storage area is positioned below the drainage area and is positioned underground; the drain pipe, at least part of drain pipe is located underground so that the outer wall surface of drain pipe and underground ground contact, the drain pipe includes body and hydrophilic portion, the body has a plurality of wash ports, the wash port is followed the radial run-through of body the body, the body has first tip and the second tip that is opposite in its extending direction, first tip with the drainage zone links to each other, the second tip with the retaining zone links to each other, hydrophilic portion laminating is in on the inner wall surface of body, hydrophilic portion's extending direction with the extending direction of body is unanimous, hydrophilic portion is made by porous material so that hydrophilic portion adsorbable fluid. Therefore, the drainage system according to the present invention has the advantage that the water level and the water content of the area can be integrally adjusted, thereby improving the utilization rate of water resources.
Description
Technical Field
The invention relates to the technical field of underground drainage, in particular to a drainage system.
Background
The water resource utilization rate and the average water resource ownership rate of China are lower, and the water resource allocation is characterized in that the space and time allocation is insufficient, and the water resource amounts in different seasons in different areas are obviously different; in the period of high water, the water content in the earth surface or the soil adjacent to the earth surface is high, and in the period of low water, the water content in the earth surface or the soil adjacent to the earth surface is low, so that the use is difficult to satisfy. In order to ensure sustainable use of water holding resources, the usability of the water resources needs to be improved, and in the related technology, a drain pipe mainly adopts: the drainage pipes in the technologies face the problems of water leakage, difficult water retention and the like when draining, and can only drain water on the ground surface and in soil as soon as possible during draining, so that the utilization rate of water resources is not high, and the water level and the water content in the ground and the soil cannot be kept in a dead water period.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent. To this end, an embodiment of the present invention proposes a drainage system.
The drainage system of the embodiment of the invention comprises:
a drainage area;
the water storage area is positioned below the drainage area and is positioned underground;
the drain pipe, at least part of drain pipe is located underground so that the outer wall surface of drain pipe and underground ground contact, the drain pipe includes body and hydrophilic portion, the body has a plurality of wash ports, the wash port is followed the radial run-through of body the body, the body has first tip and the second tip that is opposite in its extending direction, first tip with the drainage zone links to each other, the second tip with the retaining zone links to each other, hydrophilic portion laminating is in on the inner wall surface of body, hydrophilic portion's extending direction with the extending direction of body is unanimous, hydrophilic portion is made by porous material so that hydrophilic portion adsorbable fluid.
Therefore, the drainage system provided by the embodiment of the invention has the advantage that the water level and the water content of the area can be integrally adjusted, so that the utilization rate of water resources is improved.
In some embodiments, the hydrophilic portion has a cross-sectional peripheral profile that is annular;
alternatively, the outer peripheral contour of the cross section of the hydrophilic part is in a block shape;
alternatively, the outer circumferential profile of the cross section of the hydrophilic portion is arc-shaped.
In some embodiments, the hydrophilic portion includes a first wall surface and a second wall surface opposite to each other in a radial direction of the pipe body, the first wall surface is attached to an inner wall surface of the pipe body, the second wall surface is concave, and a distance between the first wall surface and the second wall surface in an axial direction of the pipe body increases or decreases.
In some embodiments, the ratio of the first wall surface to the inner wall surface of the tube body in the circumferential direction of the tube body is (0.4-0.6): 1.
in some embodiments, the tube body ceramic tube or plastic tube, the hydrophilic portion is at least one of a sponge, a cotton-flax, a hydrophilic rubber, and a water absorbent resin.
In some embodiments, the diameter of the drain hole is greater than or equal to 0.5cm and less than or equal to 2cm, and the diameter of the tube body is greater than or equal to 5cm and less than or equal to 30cm.
In some embodiments, the drain pipe is disposed obliquely, an inclination angle of an extending direction of the pipe body of the drain pipe to a horizontal plane is 20 ° or more and 45 ° or less, and the hydrophilic portion is located on a side of an inner wall surface of the pipe body disposed obliquely away from the ground surface in an up-down direction.
In some embodiments, the drainage area is located at the surface or underground, and the first end is a predetermined distance in an up-down direction from a bottom of the drainage area.
In some embodiments, the second end extends into the water storage region a distance of 1m or less from the bottom of the water storage region.
In some embodiments, the drainage zone comprises a reservoir, an earth-surface reservoir, an underground reservoir;
the water storage area comprises an underground water storage pool, underground water holes and an underground river.
Drawings
Fig. 1 is a schematic view of a drainage system according to an embodiment of the present invention.
Fig. 2 is a schematic view of a drain pipe according to an embodiment of the present invention.
Reference numerals:
a drainage system 100;
the water draining area 1, the water storing area 2, the water draining pipe 3, the pipe body 31, the water draining hole 32, the first end 33, the second end 34, the hydrophilic part 35, the first wall surface 36 and the second wall surface 37.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
A drainage system 100 according to an embodiment of the present invention is described below with reference to the accompanying drawings. As shown in fig. 1 and 2, a drainage system 100 according to an embodiment of the present invention includes a drainage zone 1, a water storage zone 2, and a drainage pipe 3.
The water storage area 2 is positioned below the drainage area 1, and the water storage area 2 is positioned underground. At least part of the drain pipe 3 is located underground so that the outer wall surface of the drain pipe 3 is in contact with the underground rock soil. The drain pipe 3 includes a pipe body 31 and a hydrophilic portion 35, the pipe body 31 having a plurality of drain holes 32, the drain holes 32 penetrating the pipe body 31 in a radial direction of the pipe body 31, the pipe body 31 having a first end 33 and a second end 34 opposite to each other in an extending direction thereof, the first end 33 being connected to the drain region 1, and the second end 34 being connected to the water storage region 2. The hydrophilic portion 35 is attached to the inner wall surface of the tube body 31, and the extending direction of the hydrophilic portion 35 coincides with the extending direction of the tube body 31, and the hydrophilic portion 35 is made of a porous material so that the hydrophilic portion 35 can adsorb fluid.
The drainage system 100 according to the embodiment of the present invention is constructed by providing a drain pipe 3 connected to the drain region 1 and the water storage region 2, and the pipe body 1 has a drain hole 32 penetrating the pipe body 31 in a radial direction thereof. Thus, the water volume (water content) of the water drainage area 1 above the water storage area 2 is high in the water-filling period, the pipe body 1 of the water drainage pipe 3 can transport the water body in the water drainage area 1 to the water storage area 2 for storage, and a part of the water body can flow into the soil between the water drainage area 1 and the water storage area 2 from the water drainage holes 32 in the water drainage process so as to improve the water volume (water content) of the water storage area 2 and the soil between the water drainage area 1 and the water storage area 2 in the water filling period.
The drain pipe 3 of the drain system 100 according to the embodiment of the present invention includes the hydrophilic portion 35 made of a porous material so as to be capable of adsorbing fluid, and therefore, the connection of the second end portion 34 to the water storage area 2 allows water to be adsorbed by the hydrophilic portion 35 in the second end portion 34 and transported by the hydrophilic portion 35 in the second end portion 34 to the hydrophilic portion 35 on the entire inner wall surface of the pipe body 31, and the drain hole 32 in the pipe body 31 allows the hydrophilic portion 35 to communicate with soil outside the pipe body 31 so that moisture in the soil can be absorbed by the hydrophilic portion 35 after entering the pipe body 1 through the drain hole 32. So that water of the hydrophilic portion 35 in the first end portion 33 can be absorbed by the drainage region 1 having a low water amount (water content) and the soil adjacent to the drainage region 1 at the time of a dead water period, that is, the drainage region 1 located above the drainage region 2 and the water flow (water content) in the soil adjacent to the drainage region 1, and the water absorbed by the hydrophilic portion 35 in the drainage region 2 and the drainage region 1 and the soil of the drainage region 2 can be transported to the drainage region 1, thereby increasing the water amount (water content) of the drainage region 1 and the soil adjacent to the drainage region 1 at the time of a dead water period.
That is, the drainage system 100 according to the embodiment of the present invention makes it possible to increase the water content (water content) of the water storage area 2 at the time of the water rich period and the soil between the drainage area 1 and the water storage area 2 at the time of the water dry period, and to increase the water content (water content) of the drainage area 1 at the time of the water dry period and the soil adjacent to the drainage area 1 by providing the drainage pipe 3 having the drainage hole 32 and the hydrophilic portion 35 between the drainage area 1 and the water storage area 2 so that the groundwater and (adjacent) surface water can flow each other so as to be within a reasonable range of the groundwater level and the water content. Compared with the prior art, the water draining pipe has the advantages that the water draining pipe is low in cost, does not consume energy during water draining and reverse water conveying, and can dynamically adjust the groundwater level and the overall water content so as to improve the utilization rate of water resources.
Therefore, the drainage system 100 according to the embodiment of the present invention has an advantage that the water level and the water content of the area can be integrally adjusted to thereby improve the utilization rate of water resources.
As shown in fig. 1 and 2, a drainage system 100 according to an embodiment of the present invention includes a drainage zone 1, a water storage zone 2, and a drainage pipe 3.
The drainage area 1 is located at the surface or underground. Specifically, the water of the drainage area 1 is surface water or groundwater adjacent to the surface. The drainage area comprises a reservoir, an earth surface reservoir and an underground reservoir. The drainage area 1 may also be a predetermined area of a predetermined distance from the ground surface. In the water-rich period, the drainage area 1 absorbs rainwater so that the water quantity (water content) of the drainage area 1 is high. For example, the distance from the drainage area 1 to the ground surface is 100m or less.
As shown in fig. 1, the water storage area 2 is located below the drainage area 1, and the water storage area 2 is located underground. Specifically, the water storage area 2 is used for water storage, and can be used as a water source for water supply of the drainage area 1 in the dry period. The water storage area 2 comprises an underground water reservoir, an underground water pore and an underground river.
At least part of the drain pipe 3 is located underground so that the outer wall surface of the drain pipe 3 is in contact with the underground rock soil. The tubular body 31 has a first end 33 and a second end 34 opposite in the direction of extension thereof, the first end 33 being connected to the drainage zone 1 and the second end 34 being connected to the water storage zone 2. Specifically, when the drainage area 1 is located underground, the drainage pipe 3 is entirely located underground. The first end 33 is an upper end of the tube 31, and the second end 34 is a lower end of the tube 31.
In some embodiments, the first end 33 has a predetermined distance from the bottom of the drainage zone 1 in the up-down direction, so that the hydrophilic part 35 in the first end 33 can supply water to the drainage zone 1 during the dry period and the drainage zone 1 having a water level exceeding the predetermined water level can supply water to the water storage zone 2 during the high period.
The second end 34 extends into the water storage area 2 and is at a distance of 1m or less from the bottom of the water storage area 2. So that the water storage area 2 can provide sufficient moisture to the drainage area 1. For example. The second end 34 is at a distance of 0.5m from the bottom of the water reservoir 2.
As shown in fig. 2, the drain pipe 3 includes a pipe body 31 and a hydrophilic portion 35, the pipe body 31 having a plurality of drain holes 32, the drain holes 32 penetrating the pipe body 31 in a radial direction of the pipe body 31. Specifically, the pipe body 31 is a ceramic pipe or a plastic pipe, so that the pipe body 1 is durable, the pipe body 31 is provided with a plurality of drain holes 32 arranged in the axial direction and the circumferential direction, and the drain holes 32 are distributed over the entire pipe body 31. The drain holes 32 facilitate drainage of the pipe body 31 to the soil (or rock) between the drain region 1 and the water storage region 2, or absorption of moisture in the soil between the drain region 1 and the water storage region 2 through the hydrophilic portion 35.
The hydrophilic portion 35 is attached to the inner wall surface of the tube body 31, and the extending direction of the hydrophilic portion 35 coincides with the extending direction of the tube body 31, and the hydrophilic portion 35 is made of a porous material so that the hydrophilic portion 35 can adsorb fluid. The hydrophilic portion 35 is at least one of sponge, cotton, and hydrophilic rubber, and water absorbent resin. So that the hydrophilic portion 35 can adsorb moisture. For example, the tube body 31 is a ceramic tube that can be spliced, and the submerged portion 35 is made of hydrophilic rubber.
In some embodiments, the diameter of the drain hole 32 is 0.5cm or more and 2cm or less, and the diameter of the tube 31 is 5cm or more and 30cm or less. This facilitates drainage of the drain pipe 32, and prevents a large amount of soil from entering the pipe body 1. For example, the drain hole 32 has a diameter of 1cm, and the pipe body 31 has a diameter of 20cm.
As shown in fig. 1, in some embodiments, the drain pipe 3 is disposed obliquely, and the extending direction of the pipe body 31 of the drain pipe 3 is inclined at an angle of 20 ° or more and 45 ° or less from the horizontal plane, and the hydrophilic portion 35 is located on the side of the inner wall surface of the obliquely disposed pipe body 31, which is away from the ground surface, in the up-down and up-down directions. Specifically, when the drain pipe 3 is provided with a place having a slope, the extending direction of the drain pipe 3 may be set according to the slope. The hydrophilic portion 35 is provided on the side of the inner wall surface of the inclined tube body 31 away from the ground surface (lower half portion in the circumferential direction of the inner wall surface) so that the hydrophilic portion can absorb moisture.
In some embodiments, the outer peripheral profile of the cross section of the hydrophilic portion 35 is annular, and the peripheral side of the annular hydrophilic portion 35 is fitted to the inner wall surface of the tube body 31.
In some embodiments, the hydrophilic portion 35 has a cross-sectional peripheral profile that is block-shaped. The hydrophilic portion in an elongated shape (block-shaped in cross section) is provided on the side of the inner wall surface of the tube body 31 away from the ground surface (lower half portion in the circumferential direction of the inner wall surface).
In some embodiments, the outer perimeter profile of the cross section of hydrophilic portion 35 is arcuate. The hydrophilic portion 35 includes a first wall surface 36 and a second wall surface 37 facing away from each other in the radial direction of the tubular body 31, the first wall surface 36 being bonded to the inner wall surface of the tubular body 31, the second wall surface 37 being concave, and the distance between the first wall surface 36 and the second wall surface 37 in the axial direction of the tubular body 31 being increased or decreased. Specifically, the first wall 36 and the second wall 37 are connected along the edges, and when the pipe body 31 is arranged obliquely, the first wall 36 is located below the second wall 37, so that the hydrophilic portion 35 is less obstructed to water flow during water-full period drainage.
In some embodiments, the dimensional ratio of the first wall surface 36 to the inner wall surface of the tube body 31 in the circumferential direction of the tube body 31 is (0.4-0.6): 1. the small size of the first wall surface 36 (hydrophilic portion 35) relative to the inner wall surface of the pipe body 31 in the circumferential direction of the pipe body 31 makes the hydrophilic portion 35 less resistant to water flow during draining in the high water period. For example, the dimensional ratio of the first wall surface 36 to the inner wall surface of the tube body 31 in the circumferential direction of the tube body 31 is 0.5:1.
in the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While the above embodiments have been shown and described, it should be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives, and variations of the above embodiments may be made by those of ordinary skill in the art without departing from the scope of the invention.
Claims (7)
1. A drainage system, comprising:
a drainage area;
the water storage area is positioned below the drainage area and is positioned underground;
a drain pipe at least partially located under the ground so that an outer wall surface of the drain pipe contacts with the ground rock, the drain pipe including a pipe body having a plurality of drain holes penetrating the pipe body in a radial direction of the pipe body, the pipe body having a first end portion and a second end portion opposite in an extending direction thereof, the first end portion being connected to the drain region, the second end portion being connected to the water storage region, the hydrophilic portion being fitted on an inner wall surface of the pipe body, an extending direction of the hydrophilic portion being identical to an extending direction of the pipe body, the hydrophilic portion being made of a porous material so that the hydrophilic portion can adsorb a fluid;
the hydrophilic part comprises a first wall surface and a second wall surface which are opposite to each other in the radial direction of the pipe body, the first wall surface is attached to the inner wall surface of the pipe body, the second wall surface is a concave surface, and the distance between the first wall surface and the second wall surface in the axial direction of the pipe body is increased and then reduced;
the drain pipe slope sets up, the drain pipe the inclination of extension direction of body with the horizontal plane is greater than or equal to 20 and less than or equal to 45, hydrophilic portion is located the upper and lower direction the one side that is away from the earth's surface on the internal face of body that the slope set up.
2. The drainage system of claim 1, wherein a dimensional ratio of the first wall surface to the inner wall surface of the pipe body in the circumferential direction of the pipe body is (0.4-0.6): 1.
3. the drainage system of claim 1, wherein the tube body is a ceramic or plastic tube and the hydrophilic portion is at least one of a sponge, a cotton-flax, a hydrophilic rubber, and a water-absorbing resin.
4. The drainage system of claim 1, wherein the diameter of the drainage hole is 0.5cm or more and 2cm or less, and the diameter of the pipe body is 5cm or more and 30cm or less.
5. The drainage system of claim 1 wherein the drainage area is located at the surface or subsurface, and the first end is a predetermined distance in the up-down direction from the bottom of the drainage area.
6. The drainage system of claim 1 wherein the second end extends into the water storage region a distance of 1m or less from the bottom of the water storage region.
7. The drainage system of any of claims 1-6 wherein,
the drainage area comprises a reservoir, an earth surface reservoir and an underground reservoir;
the water storage area comprises an underground water storage pool, underground water holes and an underground river.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211155094.0A CN115478527B (en) | 2022-09-22 | 2022-09-22 | Drainage system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211155094.0A CN115478527B (en) | 2022-09-22 | 2022-09-22 | Drainage system |
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| Publication Number | Publication Date |
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| CN115478527A CN115478527A (en) | 2022-12-16 |
| CN115478527B true CN115478527B (en) | 2023-07-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211155094.0A Active CN115478527B (en) | 2022-09-22 | 2022-09-22 | Drainage system |
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| FR2757910A1 (en) * | 1996-12-26 | 1998-07-03 | Maurice Amsellem | Self=priming siphon, e.g. for watering plants or removing pools of |
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| CN208830456U (en) * | 2018-06-26 | 2019-05-07 | 西华大学 | Sewer Catchwork irrigation device |
| CN111305345A (en) * | 2020-01-14 | 2020-06-19 | 哈尔滨工业大学(深圳)(哈尔滨工业大学深圳科技创新研究院) | Efficient water seepage and water absorption self-circulation sinking type green land and construction method thereof |
| CN211772538U (en) * | 2019-12-20 | 2020-10-27 | 青岛腾远设计事务所有限公司 | Self-circulation seepage and storage structure of sponge urban rainwater garden |
| CN216552277U (en) * | 2021-11-22 | 2022-05-17 | 贵州公路集团第九工程有限公司 | Porous hard type permeable pipe system embedded in concave green land |
-
2022
- 2022-09-22 CN CN202211155094.0A patent/CN115478527B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2757910A1 (en) * | 1996-12-26 | 1998-07-03 | Maurice Amsellem | Self=priming siphon, e.g. for watering plants or removing pools of |
| CN106193250A (en) * | 2016-08-30 | 2016-12-07 | 北京东方利禾景观设计有限公司 | A kind of motorless water-retention water charging system |
| CN208830456U (en) * | 2018-06-26 | 2019-05-07 | 西华大学 | Sewer Catchwork irrigation device |
| CN211772538U (en) * | 2019-12-20 | 2020-10-27 | 青岛腾远设计事务所有限公司 | Self-circulation seepage and storage structure of sponge urban rainwater garden |
| CN111305345A (en) * | 2020-01-14 | 2020-06-19 | 哈尔滨工业大学(深圳)(哈尔滨工业大学深圳科技创新研究院) | Efficient water seepage and water absorption self-circulation sinking type green land and construction method thereof |
| CN216552277U (en) * | 2021-11-22 | 2022-05-17 | 贵州公路集团第九工程有限公司 | Porous hard type permeable pipe system embedded in concave green land |
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| CN115478527A (en) | 2022-12-16 |
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