CN214460826U - Bottom grid barrier and upstream surface seepage flow perforated pipe water collecting gallery water taking system - Google Patents
Bottom grid barrier and upstream surface seepage flow perforated pipe water collecting gallery water taking system Download PDFInfo
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- CN214460826U CN214460826U CN202120471015.1U CN202120471015U CN214460826U CN 214460826 U CN214460826 U CN 214460826U CN 202120471015 U CN202120471015 U CN 202120471015U CN 214460826 U CN214460826 U CN 214460826U
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Abstract
The utility model belongs to the technical field of hydraulic engineering, relate to diversion water intaking technique in hydraulic engineering, specifically be end check barrier and upstream surface seepage flow floral tube collecting corridor water intaking system, midstream water intaking district include barricade, entity overflow dam section, collecting corridor cavity overflow dam section and end check barrier water intaking dam section, end check barrier water intaking dam section set up between entity overflow dam section, collecting corridor cavity overflow dam section; the part of the midstream water taking area, which is higher than the upstream seepage-proofing paving area and the downstream flat protecting area, is divided into an upstream surface, an interlayer part and a revetment; the interlayer part of the bottom grid water intake dam section is a grid and a cavity to form a bottom grid water collecting gallery, and the interlayer part of the cavity overflow dam section of the water collecting gallery is a cover plate and a cavity to form a cavity overflow dam section water collecting gallery; the bottom grid barrier water collecting gallery is communicated with the cavity overflow dam section water collecting gallery, is in a longitudinal slope structure from high to low, and is guided into a water conduit arranged at the retaining wall; not only can ensure water getting in winter, but also can save investment.
Description
Technical Field
The utility model belongs to the technical field of hydraulic engineering, a diversion water intaking technique among the hydraulic engineering is related to, specifically be bottom grating and upstream surface seepage flow floral tube corridor water intaking system that catchments.
Background
In the severe cold regions of the southwest mountain area, the stream ditch has high altitude, the river bed is narrow, the water depth is shallow, the longitudinal slope of the river bed is large, the bed load is more, the flow is unstable, and the ice easily occurs in winter. Wherein end check barrier water intaking shortcoming: firstly, in alpine mountain areas, the flow of rivers in winter is small in the dry season, and grids of the bottom grid dam are easy to freeze and cannot take water; secondly, the barrier is easy to be blocked by the pusher mass or the suspended matter. The drawback of water intaking in the infiltration canal: the water yield in the dry period is about 50-60% or even less of that in the rich period, and the water intake is extremely unstable; the infiltration channel water taking is suitable for rivers or creeks with clear mud content, but the mountainous rivers in alpine mountainous areas have larger seasonal change, the water quality of the rivers in flood seasons has larger mud content, and the infiltration channels on the creek ditches in the mountainous areas are often required to be additionally provided with erosion resistant rock due to shallow burying and weak erosion resistant capacity, so that the possibility of silting is increased, and even the required water cannot be taken; the water intake of the infiltration channel is reduced along with the increase of the service life, the designed water consumption can be obtained by the infiltration channel, the infiltration channel must be cleaned regularly and irregularly, a filter material is replaced, and the later operation cost of the infiltration channel is higher. The water taking hub for taking the small flow of the alpine mountain stream water in winter becomes a technical problem which needs to be solved urgently in local.
SUMMERY OF THE UTILITY MODEL
In order to solve the prior art problem, the utility model discloses a bottom grating and upstream surface seepage flow floral tube corridor water intaking system that catchments has been researched and developed, can guarantee the water intaking in winter, can practice thrift the investment again.
The utility model adopts the technical scheme that the bottom lattice barrier and upstream seepage flower pipe water collecting gallery water taking system comprises an upstream seepage-proofing covering area, a midstream water taking area and a downstream flat protecting area which are arranged along the water flow direction, wherein the midstream water taking area comprises an entity overflow dam section, a water collecting gallery cavity overflow dam section and a bottom lattice barrier water taking dam section, and the bottom lattice barrier water taking dam section is arranged between the entity overflow dam section and the water collecting gallery cavity overflow dam section;
the part of the midstream water taking area, which is higher than the upstream seepage-proofing paving area and the downstream apron area, is of a right-angle trapezoidal structure with a narrow upper part and a wide lower part, the rectangular part of the right-angle trapezoidal structure is divided into an upstream surface and an interlayer part along the water flow direction, and the triangular part is a revetment;
the interlayer part of the bottom grid water intake dam section is a grid and a cavity to form a bottom grid water collecting gallery,
the interlayer part of the cavity overflow dam section of the water collection gallery is a cover plate and a cavity to form a cavity overflow dam section water collection gallery; the bottom grid barrier water collecting gallery is communicated with the cavity overflow dam section water collecting gallery to form a longitudinal slope from high to low at the bottom of the water collecting gallery and is led into a water conduit arranged at the retaining wall;
the upstream surface of end grid barrier water intaking dam section and catchment corridor cavity overflow dam section has buried catchment seepage flow pipe underground, catchment seepage flow pipe lay the scope do, the minimum one deck catchment seepage flow pipe tube bottom elevation is higher than maintenance phase silt siltation elevation, the highest one deck catchment seepage flow pipe tube crest elevation is less than below the ice cap layer.
The water collecting seepage pipes are arranged in a quincunx shape, and sand gravel is graded at the inlet of each water collecting seepage pipe.
The inner diameter of the outlet of the water collecting seepage pipe is 1.2-1.5 times of the inner diameter of the inlet of the pipe.
The other end of the water conduit is provided with a grit chamber, and two branch pipelines led out from the grit chamber are respectively a blow-down pipe and a water delivery pipe.
A gate valve well is arranged in front of the grit chamber, and a manual ball valve or a hydraulic remote control ball float valve is arranged in the gate valve well.
And a gate valve well is arranged at the joint of the grit chamber and the water conveying pipe, and a manual ball valve or a hydraulic remote control ball cock is arranged in the gate valve well.
The bottom of the grit chamber is obliquely provided with a spiral sand discharge pipe, and the included angle between the spiral sand discharge pipe and the side edge of the grit chamber is 30-60 degrees; the cross section of the spiral sand discharge pipe is open, the front edge is low, the rear edge is high, and the two edges are respectively flush with the bottom surface of the grit chamber and divide the grit chamber into two parts.
The opening angle of the spiral sand discharge pipe is 80-100 degrees, the included angle between the back edge and the horizontal line is 70-90 degrees, and the inner diameter is 500-700 mm.
And a gate valve well is arranged at the joint of the spiral sand discharge pipe and the emptying pipe, and a manual ball valve or a hydraulic remote control ball cock is arranged in the gate valve well.
An overflow pipe is arranged above the water level of the grit chamber.
The utility model has the advantages that:
the bottom lattice barrier and upstream water collecting seepage pipe is adopted to comprehensively take water, and an entity overflow dam section, a bottom lattice barrier water taking dam section and a water collecting gallery cavity overflow dam section are sequentially arranged from a right bank to a left bank in consideration of the aspects of topographic geology, water taking opening arrangement, hydraulic conditions, engineering quantity, construction diversion, construction conditions, operation conditions and the like, the upstream is provided with a protective seepage cover, and the downstream is provided with a protective flat. In order to prevent the grids of the bottom grid water taking dam section from freezing and being incapable of taking water in winter, part of overflow dam sections are designed into internal cavities to form a water collecting gallery, the water collecting seepage pipes are embedded in upstream water-facing surfaces of the bottom grid water taking dam section and the water collecting gallery cavity overflow dam section together with the water collecting gallery of the bottom grid dam section, the bottom elevation of the lowest layer of water collecting seepage pipe is higher than the sediment accumulation elevation in the overhaul period, and the sediment accumulation is prevented from blocking the inlet of the water collecting seepage pipe; the top height of the highest layer of the water collecting seepage pipe is lower than that of the ice cover layer, so that the water collecting seepage pipe can take water below the ice cover layer in winter.
The water taking hub has the advantages of simple form, convenient construction, long service life, high water taking guarantee rate and small investment. The problem of the water pivot of getting water winter of high and cold mountain stream river trickle water intaking difficult is solved. The optimized design of the scheme prolongs the maintenance time period, solves the problems of siltation and blockage in the water taking process from multiple aspects, automatically discharges sand through the spiral sand discharge pipe, and has small self-body size and low investment of the water taking hub structure in the construction period; the physical labor of management personnel is reduced during the operation period, and the management cost during the operation period is reduced.
The present invention will be described in detail with reference to the accompanying drawings.
Drawings
Fig. 1 is a plan view of the present invention;
FIG. 2 is an upstream elevation view of the present invention;
FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;
FIG. 4 is a cross-sectional view taken along line B-B of FIG. 2;
FIG. 5 is a cross-sectional view taken along line C-C of FIG. 2;
fig. 6 is a schematic structural view of the grit chamber 12 and the spiral sand discharging pipe 16 in fig. 1;
fig. 7 is a cross-sectional view taken along line M-M in fig. 6.
In the attached drawing, 1 is an upstream seepage-proofing covering area, 2 is a longitudinal slope at the bottom of a water collecting gallery, 3 is a downstream flat protecting area, 4 is a solid overflow dam section, 5 is a water collecting gallery cavity overflow dam section, 6 is a bottom grid water taking dam section, 7 is a retaining wall, 8 is a bottom grid water collecting gallery, 9 is a cavity overflow dam section water collecting gallery, 10 is a water guide pipe, 11 is a water collecting seepage pipe, 12 is a grit chamber, 13 is an emptying pipe, 14 is a water conveying pipe, 15 is a sluice well, 16 is a spiral sand discharging pipe, 17 is an overflow pipe, 18 is a grid, 19 is gravel backfilling, and 20 is a lining steel plate.
Detailed Description
As shown in fig. 1-5, the bottom lattice barrier and upstream seepage flower pipe water collecting gallery water taking system comprises an upstream seepage-proofing covering area 1, a midstream water taking area and a downstream protecting area 3 which are arranged along the water flow direction, wherein the midstream water taking area comprises a retaining wall 7, an entity overflow dam section 4, a water collecting gallery cavity overflow dam section 5 and a bottom lattice barrier water taking dam section 6, the bottom lattice barrier water taking dam section 6 is arranged between the entity overflow dam section 4 and the water collecting gallery cavity overflow dam section 5, and sand gravel is backfilled 19 between the retaining wall 7 and the river bank;
the part of the midstream water taking area, which is higher than the upstream seepage-proofing paving area 1 and the downstream apron area 3, is of a right-angle trapezoid structure with a narrow upper part and a wide lower part, the rectangular part of the right-angle trapezoid is divided into an upstream surface and an interlayer part along the water flow direction, and the triangular part is a revetment;
the interlayer part of the bottom grid barrier water intake dam section 6 is a barrier 18 and a cavity to form a bottom grid barrier water collecting gallery 8, and the interlayer part of the water collecting gallery cavity overflow dam section 5 is a cover plate and a cavity to form a cavity overflow dam section water collecting gallery 9; the bottom grid barrier water collecting gallery 8 is communicated with a cavity overflow dam section water collecting gallery 9 to form a longitudinal slope 2 at the bottom of the water collecting gallery from high to low, and the longitudinal slope is led into a water conduit 10 arranged at the retaining wall 7;
bottom grid barrier water intaking dam section 6 and catchment corridor cavity overflow dam section 5 the upstream face have buried catchment and ooze the flow pipe 11 underground, catchment and ooze the flow pipe 11 and lay the scope and do, 11 socle elevations of the lowest one deck catchment and ooze the flow pipe are higher than maintenance phase silt siltation elevation, 11 socle elevations of the highest one deck catchment and ooze the flow pipe are less than below the cap layer, 11 pipe diameters of catchment and ooze the flow pipe and the radical is confirmed through hydraulic calculation according to the inflow.
The water collecting seepage pipes 11 are arranged in a quincunx shape, and sand gravel is graded at the inlet of each water collecting seepage pipe 11 for primary filtration.
The inner diameter of the outlet of the water collecting seepage pipe 11 is 1.2-1.5 times of the inner diameter of the inlet of the water collecting seepage pipe, so that impurities such as pebbles and the like can be prevented from being blocked in the water collecting seepage pipe 11 due to the structure with gradually changed pipe diameters.
The shape of the barrier 18 is a trapezoid barrier, because the trapezoid barrier is equivalent to an expanded cylindrical nozzle, vacuum caused by outflow contraction of the nozzle has suction capacity, and as a result, the flow rate of water flowing through the barrier gap is increased, so that the flow rate of the trapezoid barrier under the same barrier gap is larger; the width range of the grid bars is 1.2-2.5cm, the width of the grid bars must ensure the transverse rigidity of the grid bars, and the deformation caused by grid clamping cannot occur; the height of the grid bars is 3-4 times of the width of the grid bars so as to ensure that the nozzle outflow is approximately formed during overcurrent, thereby increasing the overcurrent.
The gate gap of the gate 18 is 1-2cm, the width of the gate gap depends on the size of the sand grain size which limits the sand entering the corridor, and the gate gap can limit about 80% of the total amount of the incoming sand in the natural river channel. Too large grid gaps are large in amount of gravels entering the water diversion gallery, large water quantity and high flow rate are needed for flushing away the gravels, and too small grid clamping probability is increased, so that trouble is brought to operation management.
From the angle that sound construction, overflow smoothly, the operation is reliable, the management is convenient, 18 mounted positions of barrier be provided with L type groove, it is all very convenient to the installation of grid, maintenance and dismantlement, can guarantee moreover that to overflow smoothly, the operation is reliable.
The other end of the water conduit 10 is provided with a grit chamber 12, and two branch conduits led out from the grit chamber 12 are a blow-down pipe 13 and a water conduit pipe 14 respectively.
A gate valve well 15 is arranged in front of the grit chamber 12, and a manual ball valve or a hydraulic remote control ball float valve is arranged in the gate valve well 15.
A gate valve well 15 is arranged at the joint of the grit chamber 12 and the water conveying pipe 14, and a manual ball valve or a hydraulic remote control ball float valve is arranged in the gate valve well 15.
The bottom of the grit chamber 12 is obliquely provided with a spiral sand discharge pipe 16, the included angle between the spiral sand discharge pipe and the side edge of the grit chamber 12 is 30-60 degrees, the included angle is too large, so that the accumulation of silt is easily caused, the included angle is too small, the sand discharge speed is slow, and the sand discharge efficiency is influenced; the cross section of the spiral sand discharge pipe 16 is open, the front edge is low, the rear edge is high, and the two edges are respectively flush with the bottom surface of the grit chamber 12 and divide the grit chamber 12 into two parts.
The opening angle of the spiral sand discharge pipe 16 is 80-100 degrees, and the opening is too small, so that the sand and the mud are easy to enter the pipe orifice and block and mutually impact with each other; the silt discharged when the opening is too large and the flow velocity is small directly falls back to the spiral silt discharging pipe 16, so that the silt is deposited. The included angle between the rear edge and the horizontal line is 70-90 degrees, the opening angle is unchanged, the included angle is too small, the central point of the opening falls, and the spiral sand discharge pipe 16 is buried deeper, so that the removal of silt is not facilitated; the contained angle is too big, and the opening central point rises, and spiral sediment outflow pipe 16 buries shallowly, and the route that silt was got rid of becomes long, and the velocity of flow that needs is great, is unfavorable for the low discharge water intaking.
The inner diameter is 500-700mm according to the flow velocity, the grain diameter of the sediment, the width of the grit chamber 12 and the like.
The junction of the spiral sand discharge pipe 16 and the emptying pipe 13 is provided with a gate valve well 15, and a manual ball valve or a hydraulic remote control ball float valve is arranged in the gate valve well 15.
The inner layer of the spiral sand discharge pipe 16 is provided with a lining steel plate 20.
An overflow pipe 17 is arranged above the water level of the grit chamber 12.
The utility model discloses when specifically using, adopt end check barrier and upstream face catchment seepage flow tube to synthesize the water intaking, arrange, hydraulic condition, engineering volume, construction water conservancy diversion, construction condition and running condition etc. aspect comprehensive consideration from topography, intake, arrange entity overflow dam section 4, end check barrier water intaking dam section 6, catchment corridor cavity overflow dam section 5 in proper order from right bank to left bank, the upper reaches are set up defences and are oozed the blanket, and the low reaches are established and are protected the flat.
According to the flow, the width of the corridor and the silt starting flow speed, the water depth, the head loss and the elevation of each point at the bottom of each segment can be obtained. And connecting the elevations of all the points to obtain the longitudinal slope 2 at the bottom of the water collecting gallery. The slope of the beginning end of the common water collecting gallery is steeper, and the end of the common water collecting gallery is gradually reduced to form an arc-shaped longitudinal slope. For the convenience of construction, can simplify the pitch arc into the broken line longitudinal gradient to the conduit 10 direction, be directed water to grit chamber 12 by conduit 10 (grit chamber 12 is intake pond effect concurrently), establish sluice valve well 15 in the front of grit chamber 12, establish manual ball valve or hydraulic remote control ball cock in the well, be used for controlling inflow, fine particle such as grit is automatic discharges grit chamber 12 through the bottom spiral sand discharge pipe 16 of grit chamber 12, overflow pipe 17 is established to grit chamber 12 above the design water level, spiral sand discharge pipe 16 is the emptying action concurrently, spiral sand discharge pipe 16 communicates with blow-down pipe 13, preliminary filterable water is carried to the water purification plant by raceway 14, each pipe export all establishes sluice valve well 15, control outflow is so that operation and maintenance.
When the river overflows from the top of the dam, part or all of the water flows into the water collecting gallery through the gaps of the barriers 18 and then flows into the water conduit 10 from one end of the gallery. The bed ballast in the river, except the sand and stone and other fine particles enter the water collecting gallery along with the water flow, the rest of the gravel and the pebbles are flushed to the downstream along with the water flow from the top of the barrier 18 or the top of the weir. In order to prevent the grids 18 of the bottom grid water taking dam section from being frozen and incapable of taking water in winter, part of overflow dam sections are designed into internal cavities to form a water collecting gallery, the water collecting seepage pipes 11 are embedded in upstream water-facing surfaces of the bottom grid water taking dam section 6 and the water collecting gallery cavity overflow dam section 5 together with the water collecting gallery of the bottom grid dam section, the water collecting seepage pipes 11 are arranged in a quincunx shape, the pipe bottom elevation of the lowest layer of water collecting seepage pipe 11 is higher than the sediment accumulation elevation in the overhaul period, and the sediment accumulation is prevented from blocking the inlets of the water collecting seepage pipes; the height of the top of the highest layer of the water collecting seepage pipe 11 is lower than that of the ice cover layer so as to realize that the water collecting seepage pipe 11 takes water below the ice cover layer in winter, and the pipe diameter and the number of the water collecting seepage pipes 11 are determined by hydraulic calculation according to the inflow rate. The water in the water collecting gallery is led to a grit chamber 12 by a water conduit 10, a spiral sand discharging pipe 16 is arranged at the bottom of the grit chamber 12, fine particles such as sand and stone are automatically discharged out of the grit chamber 12 through the spiral sand discharging pipe 16, the spiral sand discharging pipe 16 has a emptying function, the spiral sand discharging pipe 16 is communicated with a vent pipe 13, a water inlet valve can be closed when the grit chamber needs to be overhauled, and the water in the grit chamber 12 is emptied for overhauling.
Claims (10)
1. The bottom lattice barrier and upstream seepage flow perforated pipe water collecting gallery water taking system comprises an upstream seepage-proofing covering area (1), a midstream water taking area and a downstream flat protecting area (3) which are arranged along the water flow direction, wherein the midstream water taking area comprises an entity overflow dam section (4), a water collecting gallery cavity overflow dam section (5) and a bottom lattice barrier water taking dam section (6), and the bottom lattice barrier water taking dam section (6) is arranged between the entity overflow dam section (4) and the water collecting gallery cavity overflow dam section (5);
the parts of the midstream water taking area, which are higher than the upstream seepage-proofing paving area (1) and the downstream apron area (3), are of right-angle trapezoid structures with narrow tops and wide bottoms, the rectangular parts of the right-angle trapezoids are divided into an upstream surface and an interlayer part along the water flow direction, and the triangular parts are revetments;
the sandwich portion of end check barrier water intaking dam section (6) be barrier (18) and cavity, form end check barrier corridor (8) that catchments, its characterized in that:
the interlayer part of the cavity overflow dam section (5) of the water collection gallery is a cover plate and a cavity to form a cavity overflow dam section water collection gallery (9); the bottom grid barrier water collecting gallery (8) is communicated with a cavity overflow dam section water collecting gallery (9) to form a longitudinal slope (2) from high to low at the bottom of the water collecting gallery and is led into a water guide pipe (10) arranged at the retaining wall (7);
bottom grid barrier water intaking dam section (6) and the upstream face of collecting corridor cavity overflow dam section (5) buried underground catchment seepage pipe (11), catchment seepage pipe (11) lay the scope and do, the one deck catchment seepage pipe (11) pipe bottom elevation of minimum is higher than maintenance phase silt siltation elevation, the highest one deck catchment seepage pipe (11) pipe crest elevation is less than below the ice sheet.
2. The bottom grating and upstream surface seepage floral tube water collection gallery water intake system of claim 1, characterized in that: the water collecting seepage pipes (11) are arranged in a quincunx shape, and sand gravel is graded at the inlet of each water collecting seepage pipe (11).
3. The bottom grating and upstream surface seepage floral tube water collection gallery water intake system of claim 1, characterized in that: the inner diameter of the outlet of the water collecting seepage pipe (11) is 1.2-1.5 times of the inner diameter of the inlet of the pipe.
4. The bottom grating and upstream surface seepage floral tube water collection gallery water intake system of claim 1, characterized in that: the sand basin (12) is arranged at the other end of the water conduit (10), and two branch pipelines led out of the sand basin (12) are respectively a blow-down pipe (13) and a water delivery pipe (14).
5. The bottom grating and upstream surface seepage floral tube water collection gallery water intake system of claim 4, wherein: a gate valve well (15) is arranged in front of the grit chamber (12), and a manual ball valve or a hydraulic remote control ball float valve is arranged in the gate valve well (15).
6. The bottom grating and upstream surface seepage floral tube water collection gallery water intake system of claim 4, wherein: a gate valve well (15) is arranged at the joint of the grit chamber (12) and the water delivery pipe (14), and a manual ball valve or a hydraulic remote control ball cock is arranged in the gate valve well (15).
7. The bottom grating and upstream surface seepage floral tube water collection gallery water intake system of claim 4, wherein: a spiral sand discharge pipe (16) is obliquely arranged at the bottom of the grit chamber (12), and the included angle between the spiral sand discharge pipe and the side edge of the grit chamber (12) is 30-60 degrees; the cross section of the spiral sand discharge pipe (16) is open, the front edge is low, the rear edge is high, and the two edges are respectively flush with the bottom surface of the grit chamber (12) and divide the grit chamber (12) into two parts.
8. The bottom grating and upstream surface seepage floral tube water collection gallery water intake system of claim 7, wherein: the opening angle of the spiral sand discharge pipe (16) is 80-100 degrees, the included angle between the back edge and the horizontal line is 70-90 degrees, and the inner diameter is 500-700 mm.
9. The bottom grating and upstream surface seepage floral tube water collection gallery water intake system of claim 7, wherein: the junction of the spiral sand discharge pipe (16) and the emptying pipe (13) is provided with a gate valve well (15), and a manual ball valve or a hydraulic remote control ball cock is arranged in the gate valve well (15).
10. The bottom grating and upstream surface seepage floral tube water collection gallery water intake system of claim 4, wherein: an overflow pipe (17) is arranged above the water level of the grit chamber (12).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120471015.1U CN214460826U (en) | 2021-03-04 | 2021-03-04 | Bottom grid barrier and upstream surface seepage flow perforated pipe water collecting gallery water taking system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120471015.1U CN214460826U (en) | 2021-03-04 | 2021-03-04 | Bottom grid barrier and upstream surface seepage flow perforated pipe water collecting gallery water taking system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114351654A (en) * | 2021-11-26 | 2022-04-15 | 中国电建集团西北勘测设计研究院有限公司 | Three-layer filtering bottom barrier dam structure |
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2021
- 2021-03-04 CN CN202120471015.1U patent/CN214460826U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114351654A (en) * | 2021-11-26 | 2022-04-15 | 中国电建集团西北勘测设计研究院有限公司 | Three-layer filtering bottom barrier dam structure |
| CN114351654B (en) * | 2021-11-26 | 2023-12-01 | 中国电建集团西北勘测设计研究院有限公司 | Three-layer filtering bottom barrier dam structure |
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