CN104514216B - A kind of canal on embankment frost heaving resistant leakage preventing structure and construction method - Google Patents
A kind of canal on embankment frost heaving resistant leakage preventing structure and construction method Download PDFInfo
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- CN104514216B CN104514216B CN201310443467.9A CN201310443467A CN104514216B CN 104514216 B CN104514216 B CN 104514216B CN 201310443467 A CN201310443467 A CN 201310443467A CN 104514216 B CN104514216 B CN 104514216B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B13/00—Irrigation ditches, i.e. gravity flow, open channel water distribution systems
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/16—Sealings or joints
Abstract
The invention discloses a kind of canal on embankment frost heaving resistant leakage preventing structure and construction method, it is characterised in that：There is gutter channel both sides；There is aeolian accumulation sand bedding course canal bottom and Qu Di both sides；There is plastic film on aeolian accumulation sand bedding course；Canal bottom and Qu Di junctions toe are cast-in-place concrete；Precast concrete block is laid on plastic film；There is the concrete slab that bears down on one in canal levee crown portion.Its construction method includes excavating surface water channel, clears up Canal Base soil, fill canal dike, laying aeolian sand, lay plastic film, cast-in-place arc canal base concrete, build concrete precast block by laying bricks or stones, lay the technical steps such as concrete slab that bear down on one.Seepage, frost heaving failure in being designed this invention removes conven-tional channels, the problems such as quality is not easy to ensure, change under channel bottom and both sides canal dike and fill out aeolian accumulation sand bedding course, improve foundation bearing capacity, mitigate frost heave；Polyethylene plastic film is equipped with aeolian accumulation bed course, prevents canal seepage；Concrete is built by laying bricks or stones on polyethylene plastic film, prevents from washing away and seepage；Cast-in-place concrete arc canal bottom, stress condition is good, prevents stress concentration；Surface water channel, underground hydropexis is prevented, eliminate frost heave.
Description
Technical field
The invention belongs to Hydraulic Structure Engineering technical field, more particularly to hydraulic engineering canal on embankment frost heaving resistant leakage preventing structure
And construction method.
Background technology
Agricultural water is that China uses water rich and influential family, according to statistics, China's Water Consumption in Agriculture account for the 70% of national year water total amount with
On, and China at present oneself build dry, branch canal and there is substantial amounts of channel there is no antiseepage, water efficiency of canal system is very low, substantial amounts of irrigation water
It has lost during channel hydraulic pipeline, the especially such a water resource assignment in China is uneven, and again very deficient area, canal
Road seepage is the immediate cause for causing water efficiency of canal system not high.After the anti-seepage of channels, the profit of water on the one hand can be improved
With rate, alleviate agricultural water imbalance between supply and demand, the water of saving can bring more land under irrigation, and promote the development of agricultural production；The opposing party
Face can be prevented and improved salt-soda soil and marshland with lowering of watertable, be advantageous to ecological environment and modernization construction.Cause
This, further development and channels seepage control project technology, persistently send out alleviating China's the contradiction of supply and demand for the water resource and national economy
Exhibition has important strategic importance.
The anti-seepage of channels is China's most widely used water-saving engineering technology at present, commonly uses earth material, soil cement, stone-laying, coagulation
The material such as soil, bituminous concrete and coating materials is used as anti-seepage of channels layer, reaches the purpose for preventing canal seepage, country's promulgation《《Canal
Road seepage control project technical specification》》(GB/T 50600-2010) just the design to various method for preventing leakage canal and construction propose will
Ask.In the design of the common anti-seepage of channels, plastic film antiseepage is generally adopted by, is having the area washed away, is also having using concrete
Plate and the double anti-methods of plastic film, concrete slab can not only resist current scour, and the effect of joint antiseepage can be played with plastic film
Fruit.
But for the channel of cold district, except there is the requirement of the requirement of antiseepage, also frost heaving resistant.Above-mentioned plastic film is prevented
Blending concrete slab antiseepage has the advantages that good seepage-proof property, erosion resistibility are strong, but its frost heaving resistant performance is not satisfactory.If
Frost heaving resistant issue handling is bad, does not have the effect of antiseepage not only, and may make concrete slab and plastic film jacking due to frost heave
Destroy, waste of resource and fund.
So the Open Channel Construction for some ruthless area has not only required antiseepage, had antiscour again, more require
There is the technology of freeze proof requirement but specific and clearly provide, limit and constrain to a certain extent these canal in area lining cutting
The development and popularization of technology, therefore there is an urgent need to one kind can play antiseepage, protection against erosion again in the channel building of cold district
The economically viable construction technology of energy frost heaving resistant.
The content of the invention
It is an object of the invention to provide a kind of canal on embankment frost heaving resistant leakage preventing structure, existing channel seepage technique is overcome not
The defects of anti-impact prevents blending frost heaving resistant requirement can be taken into account simultaneously.
To achieve these goals, technical scheme is as follows：A kind of canal on embankment frost heaving resistant leakage preventing structure, it is special
Levy and be to be equipped with aeolian accumulation sand bedding course in channel bottom and Qu Di sides, plastic film is provided with aeolian accumulation sand bedding course；Set on plastic film
It is equipped with concrete.Wherein canal bottom and canal bottom and Qu Di junctions are cast-in-place concrete, and precast concrete, canal are set on the inside of canal dike
There is the concrete block that bears down on one in levee crown portion.In channel both sides, gutter is set.
The concrete slab and antiseepage plastic film of use not only can be very good to play the function of composite anti-penetrating and protection against erosion, and
The aeolian accumulation sand bedding course laid on channel bottom and canal dike, drainage is preferable, and cuts off the capillary water of ground, eliminates to be formed
The water level condition of frost heave, while the aggregation of soil salt is prevented, there is the swollen effect of preventing and treating salt, ensure that canal lining structure
Safety and stability；Construction at the cast-in-place arc canal bottom of channel toe, substantially improves the frost heave stress condition of liner structure, subtracts
The small possibility of frost heave, while factory of the precast concrete block system seriation generation that Qu Di both sides are set, ensure that concrete
Compactness and intensity, reduce the possibility of freeze-thaw damage, the shape of six prismatics of use also improves stress condition, maximum limit
The mitigation frost heave of degree.All aeolian accumulation sand bedding courses and concrete block are all according to channel on the sunny side and above and below in the shade face and channel water level
Using different thickness, quantities, investment reduction are not only reduced, and the thickness used all combines meteorology, the hydrology, geology
Determined etc. environmental condition so that method is more reliable and safe.
Another object of the present invention is to provide a kind of channel frost heaving resistant leakage preventing structure construction method, existing channel is overcome to prevent
The technology of oozing can not take into account the defects of anti-impact prevents blending frost heaving resistant requirement simultaneously.
To achieve these goals, technical scheme is as follows：A kind of channel frost heaving resistant leakage preventing structure construction party
Method, it is technically characterized in that：A, the gutter of trapezoidal cross-section is excavated in channel both sides；B, sandy loam is laid in canal dike to go forward side by side
Row rolls；C, along channel longitudinal direction casting concrete partition wall；D, in the clean aeolian sand in canal bottom and the backfill of Qu Di both sides；E, laying
Good aeolian accumulation sand bedding course upper berth, which is set up defences, oozes plastic film, and canal levee crown portion plastic film excavates groove embedment, and top is filled with aeolian sand；F, in canal
Making cement mortar bedding cushion and cast-in-place concrete on the partial barrier plastic film of bottom；G, in Qu Di and canal bottom junction making cement bonded sand
Starch bed course and cast-in-place concrete；H, making cement mortar and precast concrete block is built by laying bricks or stones on Qu Di sides antiseepage plastic film；I, exist
Canal levee crown portion is cast-in-place or lays prefabricating coping concrete block, and the parting between concrete slab is tamped with fines concrete.
The canal bottom and the cast-in-place concrete of Qu Di junctions are arc；The canal dike precast concrete block is six prismatics；Institute
It can be polyethylene, polyvinyl chloride or composite geo-membrane to state antiseepage plastic film material.
Advantages of the present invention and effect are：Backfilled, can played very using aeolian accumulation sand bedding course at canal bottom and Qu Di both sides
Good freeze proof, heat insulation effect, while also prevent the swollen effect of salt；Seepage by geo-textile plastic film has that adaptive deformation ability is strong, construction
The advantages that convenient, low cost, can not only separate capillary water on invade, and the downward seepage of channel water can be prevented, effectively
Improve water efficiency of canal system；The concrete block of prefabrication ensure that the intensity and compactness of concrete, and six prismatics have
Good stress condition, while concrete block can not only prevent seepage, and also extraordinary anti-impact brushing effects；Canal dike and
Cast-in-place concrete arc-shaped canal bottom is used between canal base concrete block, solves asking for conventional trapezoidal section canal stress condition difference
Topic, increase the ability of freeze proof bulging deformation；Being excavated on the outside of canal dike has gutter, can effectively reduce level of ground water, mitigates canal
The inducement of road frost heaving failure.Working procedure of the present invention is concise, on the basis of traditional construction technology, using aeolian accumulation sand bedding course, soil
The structure of work antiseepage plastic film, precast concrete block and gutter composition serves the effect of swollen compound anti-freezing, antiseep and protection against erosion
Fruit, easy to operate, facility is simple, economical and efficient.
Brief description of the drawings
Fig. 1 is drawing in side sectional elevation of the present invention.
Fig. 2 is plan of the present invention.
Fig. 3 is precast concrete block drawing of the present invention.
Fig. 4 is I-I profiles of the present invention.
Fig. 5 is that canal dike of the present invention bears down on one drawing.
In figure：1. canal levee foundation is native；2. gutter；3. canal dike；4. aeolian accumulation sand bedding course；5. seepage by geo-textile plastic film；6. cement
Mortar bed；7. concrete canal bottom；8. precast concrete block；9. arc concrete toe；10. bear down on one concrete block；11.
Concrete partition；12. asphalt polyurethane；13. fines concrete.
Embodiment
Below in conjunction with technical scheme and accompanying drawing describe in detail the present invention embodiment, such as Fig. 1, Fig. 2, Fig. 3, Fig. 4,
Shown in Fig. 5.Protection scope of the present invention is not limited only to the description of present embodiment.
As shown in Fig. 1,2,3,4 and 5, a kind of channel frost heaving resistant leakage preventing structure and construction method, by aeolian accumulation sand bedding course 4, soil
Work antiseepage plastic film 5, precast concrete block 8, arc concrete toe 9 and gutter 2 form, in seepage by geo-textile plastic film 5, concrete
Cement mortar bedding cushion 6 is provided between canal bottom 7, precast concrete block 8 and arc concrete toe 9.
A kind of channel frost heaving resistant leakage preventing structure and construction method, its construction procedure are：
(1) the canal levee foundation soil 1 in the range of canal cross section is cleaned out with bull-dozer, cleaning thickness is according to geological conditions
It is determined that not less than 20cm, until the fresh soil body；
(2) gutter 2 of trapezoidal cross-section is excavated in channel both sides, not only canal frost heave can be prevented with lowering of watertable,
It is also prevented from Pedotransfer function.
(3) native 1 surface of loose canal levee foundation and suitably watering moistening are dug, is transported to satisfactory sandy loam with dump truck
The opening position of canal dike 3, every layer of paving soil thickness are not more than 20cm, and earth material must not contain weeds, and the duplex of 5-7 tons is drawn with construction machinery
Sheep-foot roller rolls, and machine travel speed is not more than 3km/h, and dry density is not less than 1.65t/m3, compactness is not less than 0.98, canal dike
3 laying width are respectively more than on the inside of channel and outside is not less than 50cm；
(4) channel longitudinal direction sets concrete partition 11 one every 8 ~ 10m, wide to be not less than 300mm, is more than 500mm deeply and buries
Enter the soil body and be not less than 200mm, directly excavate the soil body in Qu Di and canal bottom and erect template, cast-in-place intensity is not less than 250# coagulation
Soil.Permanent expansion joint of the concrete partition 11 as channel, if lining canal has destruction to be easy to R and M.
(5) the canal dike 3 rolled is manually cut into slope to design section, clean aeolian accumulation is backfilled from canal bottom to the both sides of canal dike 3
Sand bedding course 4, granule content of the particle diameter less than 1mm are not more than 5%, and clay content must not exceed 5%, while carry out artificial watering and by people
Work uses plate vibrator vibration compacting, and compacting factor is not less than 0.96.The wherein canal base thickness degree of aeolian accumulation sand bedding course 4 is not less than
Thickness is not less than 6cm on 15cm, sunny slope and water level, and thickness is not less than 8cm under in the shade face and water level.Aeolian accumulation sand bedding course 4 can be cut
The capillary water of disconnected ground, eliminates the water level condition for forming frost heave, while prevents the aggregation of soil salt, has the swollen work of preventing and treating salt
With；
(6) seepage by geo-textile plastic film 5 is laid on the aeolian accumulation sand bedding course 4 of acceptance(check), thickness is not less than 0.25mm, geotechnique
Antiseepage plastic film 5 answers view picture to lay, and reduces joint as far as possible, should be laid from upstream toward downstream, the bank of channel one to another bank, in lap-joint
Swim a width to cover on the width of downstream, the lap of splice is not less than 30cm, is bonded using heated bitumen, and workmen must wear no shoe tack
Walking shoes operation, must not pay attention to and trample on seepage by geo-textile plastic film 5, have breakage part to repair in time, the seepage by geo-textile modeling subsidized
Film 5 should be greater than hole area more than one times.Seepage by geo-textile plastic film 5 should be close to aeolian sand, and bubble should discharge in time；Seepage by geo-textile is moulded
Film 5 should be bonded when running into concrete partition 11, and be bent downwards, it is ensured that and the lap of splice is not less than 200mm, while in Qu Di
Triangular groove section is excavated at top, and antiseepage plastic film is close into section embedment, aeolian sand is embedded on plastic film and is tamped；
(7) branch founds the template of cast-in-place concrete on the seepage by geo-textile plastic film 5 of canal bottom laying, and template should have necessarily just
Degree, it is ensured that will not positioning when pouring.Seepage by geo-textile plastic film 5 must not be trampled in construction, the piecemeal length at cast-in-place concrete canal bottom 7
Depending on canal cross section size, generally higher than 1m.Checking template and confirming to want the seepage by geo-textile at casting concrete canal bottom 7
Making intensity is not less than 100# cement mortar bedding cushion 6 on plastic film 5；
(8) concrete material mixed is vibrated after putting in storage with plate vibrator by chute Secondary Transport to canal bottom,
Manually wipe one's face.Prevent that separation, bleeding and slump reduce in concreting process, the construction of storehouse method, concrete are jumped using piecemeal
Label is not less than 200#, and canal base concrete thickness is not less than 8cm；
(9) after reaching prescribed strength at cast-in-place concrete canal bottom 7, vertical concrete canal bottom 7 and Qu Di junctions arc are propped up
The template of concrete toe 9, also using the method for piecemeal supporting module, piecemeal length is not less than 1m, and template is to process in advance
Standard arc template, it is ensured that arc formwork consolidates, and must not trample on seepage by geo-textile plastic film 5 in construction.Check arc concrete
The template of toe 9 it is reliable it is errorless after, making intensity is not on seepage by geo-textile plastic film 5 in the arc concrete toe 9 to be poured
Cement mortar bedding cushion 6 less than 100#；
(10) by the concrete material mixed by chute Secondary Transport to the concrete arc-shaped toe 9 for having propped up template,
Adjacent modular arc plank sheathing bracing wire ensures cambered surface elevation, is vibrated with plate vibrator, and shaping of manually wiping one's face, concrete grade is not
Less than 200#.Prevent that separation, bleeding and slump reduce in concreting process, method construction in storehouse is jumped using piecemeal；Concrete
Arc toe 9 solves the problems, such as the easy frost heaving failure of rectangular canal toe, has preferable stress performance, can be very good to fit
Frost-heaving deformation is answered, the concrete thickness thinnest part of arc toe is not less than 7cm；
(11) it is the mechanical transport of precast concrete block 8 being pre-installed in factory for prefabrication is standby to canal top, prefabricated section six
Prismatic, the wherein thickness of sunny slope and waterline above concrete precast block 8 are not less than 5cm, are mixed below in the shade face and waterline
The thickness for coagulating native prefabricated section 8 is not less than 7cm.It is bottom-up in canal after the base plate strength of arc concrete toe 9 reaches 70%
Making intensity is not less than 100# cement mortar bedding cushion 6 on dike seepage by geo-textile plastic film 5.To manually the prefabricated mixed of canal top be placed on
Solidifying soil block 8 is carried at construction, the making precast concrete block 8 on cement mortar, a width of 2.5cm of parting between six rib blocks,
Ensure that 8 slurries of precast concrete block are full, consolidate.Six prismatic mechanical characteristics are good compared with rectangle, while piecemeal is smaller, can fit well
Answer frost-heaving deformation；
(12) it is the parting between precast concrete block 8 is unified by manually filling recessed joint with 100# fines concretes 13, stretch
Before contracting seam filling with air compressor will stitch in debris, dust remove clean, keep drying in seam.Concrete partition 11 it is permanent
Before the filling of expansion joint also with air compressor will stitch in debris, dust remove clean, keep dry in seam, bottom is gathered using pitch
Urethane 12, top 1-2cm use the joint filling of fines concrete 13.
(13) parting between the cast-in-place or prefabricated concrete block 10 that bears down on one in Qu Di upper berths, the concrete block 10 that bears down on one is used
Fines concrete 13 tamps, and prevents rainwater etc. from penetrating into the rear portion of lining canal, causes the anti-seepage of channels and freeze proof failure.
Claims (4)
1. a kind of canal on embankment frost heaving resistant leakage preventing structure, it is characterised in that be equipped with aeolian sand pad in channel bottom and Qu Di sides
Layer, it is provided with plastic film on aeolian accumulation sand bedding course；Concrete is provided with plastic film, gutter, wherein canal bottom are set in channel both sides
And canal bottom and Qu Di junctions are cast-in-place concrete, set precast concrete on the inside of canal dike, there is the concrete that bears down on one in canal levee crown portion
Block, canal bottom and the toe cast-in-place concrete of Qu Di junctions are arc, and canal dike precast concrete block is six prismatics, channel longitudinal direction every
8 ~ 10m sets one of concrete partition, wide to be not less than 300mm, it is deep be more than 500mm and be embedded to the soil body be not less than 200mm, concrete every
Permanent expansion joint of the wall as channel, the permanent expansion joint bottom of concrete partition use asphalt polyurethane, and top 1-2cm is used
Fines concrete joint filling, aeolian accumulation sand bedding course canal base thickness degree are not less than 15cm, and thickness is not less than 6cm on canal dike sunny slope and water level,
Thickness is not less than 8cm under the canal levee back back and water level, and the thickness of sunny slope and waterline above concrete precast block is not less than
The thickness of 5cm, in the shade face and the following concrete precast block of waterline is not less than 7cm.
A kind of 2. canal on embankment frost heaving resistant leakage preventing structure according to claim 1, it is characterised in that：Antiseepage plastic film material is
Polyethylene, polyvinyl chloride or composite geo-membrane.
3. a kind of channel frost heaving resistant leakage preventing structure construction method, it is technically characterized in that：The construction method comprises the following steps：
A, the gutter of trapezoidal cross-section is excavated in channel both sides；
B, sandy loam is laid in canal dike and is rolled, every layer of paving soil thickness is not more than 20cm, and 5-7 tons are drawn with construction machinery
Duplex sheep-foot roller roll, machine travel speed is not more than 3km/h, and dry density is not less than 1.65t/m3, compactness is not less than
0.98, canal dike laying width is respectively more than on the inside of channel and outside is not less than 50cm；
C, along channel longitudinal direction casting concrete partition wall, channel longitudinal direction sets one of concrete partition every 8 ~ 10m, wide to be not less than
300mm, depth, which is more than 500mm and is embedded to the soil body, is not less than 200mm；
D, it is not more than 5% in the clean aeolian sand in canal bottom and the backfill of Qu Di both sides, granule content of the particle diameter less than 1mm, clay content is not
Must be more than 5%, while carry out artificial watering and by manually using plate vibrator vibration compacting, compacting factor is not less than 0.96；
E, set up defences on the aeolian accumulation sand bedding course upper berth laid and ooze plastic film, canal levee crown portion plastic film excavates groove embedment, top aeolian accumulation
Sand fills；
F, cement mortar bedding cushion of the making intensity not less than 100# and cast-in-place concrete, coagulation on the partial barrier plastic film of canal bottom
Prevent that separation, bleeding and slump reduce in native casting process, method construction in storehouse is jumped using piecemeal, concrete grade is not less than
200#, canal base concrete thickness are not less than 8cm；
G, at the cement mortar bedding cushion of Qu Di and canal bottom junction making intensity not less than 100# and cast-in-place concrete, the canal bottom
Be arc with the cast-in-place concrete of Qu Di junctions, prevent that separation, bleeding and slump reduce in concreting process, using point
Block jumps the construction of storehouse method, and concrete grade is not less than 200#, and the concrete thickness thinnest part of arc toe is not less than 7cm；
H, making cement mortar and build precast concrete block by laying bricks or stones on Qu Di sides antiseepage plastic film, treat arc concrete toe bottom plate
After intensity reaches 70%, the bottom-up making intensity on canal dike seepage by geo-textile plastic film is not less than 100# cement mortar pad
Layer, the making precast concrete block on cement mortar, a width of 2.5cm of parting between six prismatic precast concrete blocks, it is ensured that pre-
Concrete block slurry processed is full, consolidates；
I, it is cast-in-place or laying prefabricating coping concrete block, the parting between concrete slab are filled out with fines concrete in canal levee crown portion
Real, the permanent expansion joint bottom of concrete partition uses asphalt polyurethane, and top 1-2cm uses fines concrete joint filling.
A kind of 4. channel frost heaving resistant leakage preventing structure construction method according to claim 3, it is characterised in that：The antiseepage modeling
Membrane material is polyethylene, polyvinyl chloride or composite geo-membrane.
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| CN201310443467.9A CN104514216B (en) | 2013-09-26 | 2013-09-26 | A kind of canal on embankment frost heaving resistant leakage preventing structure and construction method |
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| CN201310443467.9A CN104514216B (en) | 2013-09-26 | 2013-09-26 | A kind of canal on embankment frost heaving resistant leakage preventing structure and construction method |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104846851B (en) * | 2015-05-26 | 2016-10-05 | 中国化学工程第三建设有限公司 | The construction method of side of the base plate non-frost heave layer |
| CN106759123B (en) * | 2017-01-06 | 2018-11-20 | 石河子大学 | The method for eliminating the canal for water conveyance frost heaving failure effect that Frozen Area winter runs without ice sheet, high water level |
| CN106906796B (en) * | 2017-02-28 | 2019-11-26 | 水利部交通运输部国家能源局南京水利科学研究院 | A kind of method and structure for anti-seepage of channels anti-freeze expansion |
| CN108166455B (en) * | 2017-12-21 | 2020-03-03 | 水利部交通运输部国家能源局南京水利科学研究院 | Construction method and structure for preventing frost heaving of excavation channel in high and cold area |
| CN109281299B (en) * | 2018-10-22 | 2020-10-30 | 浙江水利水电学院 | Construction method of water conservancy agricultural irrigation seepage-proofing channel |
| CN109723043A (en) * | 2019-01-11 | 2019-05-07 | 中灌顺鑫华霖科技发展有限公司 | Irrigation and drainage Open Channel Construction method |
| CN109853469A (en) * | 2019-01-31 | 2019-06-07 | 深圳春沐源控股有限公司 | Antiseepage dykes and dams |
| CN111945671B (en) * | 2020-07-27 | 2021-07-09 | 中电建十一局工程有限公司 | Construction method of concrete tooth wall at channel toe |
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| CN2079113U (en) * | 1990-05-17 | 1991-06-19 | 湖南省防水材料厂 | Anti-freezing anti-leaking laminated composite plate |
| CN2536646Y (en) * | 2001-12-27 | 2003-02-19 | 刘庆华 | Anti-penetrating canal with composite coated tiles |
| CN1482304A (en) * | 2002-09-09 | 2004-03-17 | 新疆西龙土工新材料股份有限公司 | Method of laying, welding and construction of canal seepage proof film |
| CN101967811A (en) * | 2009-07-27 | 2011-02-09 | 北京仁创科技集团有限公司 | Hydraulic structure |
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