CN106337424A - Cofferdam semi-enclosed type foundation pit without interrupting water conveying during canal lining restoration and method - Google Patents
Cofferdam semi-enclosed type foundation pit without interrupting water conveying during canal lining restoration and method Download PDFInfo
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- CN106337424A CN106337424A CN201610916319.8A CN201610916319A CN106337424A CN 106337424 A CN106337424 A CN 106337424A CN 201610916319 A CN201610916319 A CN 201610916319A CN 106337424 A CN106337424 A CN 106337424A
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- cofferdam
- water
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/02—Restraining of open water
- E02D19/04—Restraining of open water by coffer-dams, e.g. made of sheet piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B5/00—Artificial water canals, e.g. irrigation canals
- E02B5/02—Making or lining canals
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- General Engineering & Computer Science (AREA)
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- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
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Abstract
The invention discloses a cofferdam semi-enclosed type foundation pit without interrupting water conveying during canal lining restoration and a method. The foundation pit is characterized in that a water canal (1) comprises lining plates (2) laid in the water conveying direction and oblique canal slopes (3) symmetrically arranged along the lining plates (2); a cofferdam (4) is arranged on the water canal (1); the cofferdam (4) is located on one side of the water canal (1) and fixed to the canal slopes (3); the lower portion of the cofferdam (4) and the water canal (1) form a fastland foundation pit body (5); the cofferdam (4) is of a modular buoyancy tank steel structures; and exhaust and water drainage structures (4.1) are arranged in the cofferdam (4). The defect that in the prior art, cofferdams can cause damage to canal structures is overcome, and the foundation pit has the advantages of being greatly reducing flood peak in the foundation pit and effectively reducing uplift pressure borne by lining in the foundation pit.
Description
Technical field
The invention belongs to Construction for Hydroelectric Project diversion technology field, it is more specifically during canal lining is repaired not
Cofferdam semi-wrapped style foundation ditch and method under the conditions of disconnected water delivery.
Background technology
For solving the imbalance of regional water, the water diversion project of China gets more and more.Build up operation with engineering, defeated
Water channel road is affected by many factors such as channel SEA LEVEL VARIATION, drainage system operation conditions, freeze thawing, construction qualities, may go out
The damage of the forms such as existing concrete lining plate ftractures, subsides, anti-floating unstability, can lead to channel local head to damage to a certain extent
Lose increase, seepage prevention system destroy, serious when lead to slope instability, have influence on the safe operation of channel.
At present channel reparation is generally cut off the water supply reparations, but for large-sized water transfer project, as the south water to north having put into operation
Work centerline, is responsible for Beijing, Tianjin and Hebei, Henan Province's Yan Qu line large- and-medium size cities resident living and industrial confession
Water task, once supply water interrupting, affects social influence that is wide, causing big.Accordingly, it would be desirable to not interrupt channel hydraulic pipeline condition
Under, foundation ditch is formed using cofferdam, carries out canal lining under the protection in cofferdam and do ground repairing construction, continuously supply to user as far as possible
Water, improves water services quality.
Conventional bank material is generally native stone, concrete, stone-laying, steel sheet pile etc..Concrete, stone-laying cofferdam are difficult under water
Construction；Earth rock cofferdam section is larger, forms foundation ditch arrangement relative difficulty in limited canal cross section, and soil erosion may lead to
Water delivery inverted-siphon along the line and canal silting, affect channel hydraulic pipeline ability, water quality in pollution channel；Steel sheet-pile cofferdam typically will insert
Weir base certain depth keeps stable, or basic casting concrete, and channel structure can be caused damage.After cofferdam forms foundation ditch, by
Connect in the drainage blanket that canal liner plate and impervious barrier bottom are typically provided, keeping at a certain distance away in bed course, it is dark to be disposed with draining
Pipe, the Water penetrative flexible pipe end in liner plate is provided with the measures such as non-return valve, when the outer channel hydraulic pipeline water level of foundation ditch is higher, foundation ditch
Very high head can be born in inside lining plate bottom, occurs uplift pressure to destroy.
In addition canal for water conveyance is longer, and position to be repaired is likely distributed in multiple different places along the line, applies in the urgent need to one kind
The prosthetic device that work is quick, convenient, can be recycled.
Content of the invention
The first object of the present invention is to overcome the weak point of above-mentioned background technology, and proposes in canal lining reparation not
Semi-wrapped style foundation ditch in cofferdam under the conditions of disconnected water delivery.
The first object of the present invention is implemented by following scheme: cofferdam under the conditions of water delivery is not interrupted in canal lining reparation
Semi-wrapped style foundation ditch, water flowing channel is included along the liner plate of water delivery direction laying with along the described symmetrically arranged inclination of liner plate
Canal slope；
Cofferdam is provided with water flowing channel, described cofferdam is located at the described side of water flowing channel and is fixed with canal slope
Together；The bottom in described cofferdam and described water flowing channel form dry foundation pit,
Described cofferdam is modular buoyancy tank steel construction, is internally provided with aerofluxuss, discharge structure in the cofferdam told, in institute
The bottom in the cofferdam stated is provided with valve rubber, and described valve rubber is close on described liner plate；
It is made up of several casings in described cofferdam, each casing is directly connected by lock, and in adjacent casing
Between be provided with water sealing structure；
It is provided with drainage blanket in the bottom of described liner plate and impervious barrier, be equidistantly provided with described drainage blanket
Water tube hose, is provided with non-return valve in the end of each described Water penetrative flexible pipe, places and remove outside described dry foundation pit
Non-return valve on obturator is installed, the non-return valve between the edge in described obturator and described cofferdam is mounted on
Immersible pump.
In technique scheme: described cofferdam is in " [" type structure in canal for water conveyance.
In technique scheme: described obturator is arranged on second or some rows of described dry foundation pit periphery
The aperture of the non-return valve of dismounting on.
In technique scheme: between described dry foundation pit and described water flowing channel, the drainage blanket of setting is protected all the time
Hold connection.
In technique scheme: described water flowing channel for inverted trapezoidal structure.
In technique scheme: the opposite side of described dry foundation pit remains water flowing.
In technique scheme: the non-return valve in cofferdam described in keeping keeps opening-wide state.
In technique scheme: in described dry foundation pit, immersible pump is installed.
The second object of the present invention is to propose a kind of construction method and is under the conditions of canal lining reparation do not interrupt water delivery
The method of cofferdam semi-wrapped style foundation ditch.
The second object of the present invention is implemented by following scheme: cofferdam under the conditions of water delivery is not interrupted in canal lining reparation
The method of semi-wrapped style foundation ditch, comprises the steps；
1., obturator is installed: the side of described water flowing channel is provided with cofferdam, the lining cutting of described cofferdam and bottom
Form dry foundation pit, described dry foundation pit does not carry out draining in advance, remove dry foundation pit periphery second or some row's checks
After valve, then remove, removing non-return valve, the in the hole installation obturator staying, described obturator blocks the water in water flowing channel
Water stream channel with bottom drainage blanket；
2., installing submersible pump: interior and dry foundation pit border between in the range of the obturator obstruction outside dry foundation pit
It is respectively mounted immersible pump on the aperture of non-return valve；
3., do foundation pit internal drainage to process: the non-return valve in dry foundation pit region described in keeping opens wide all the time；
4., cofferdam demolition: after the completion of channel is repaired, cofferdam is dismantled as several buoyancy tanks, by tractor tug by buoyancy tank water
Fortune or disembarkation land transportation are repaired to next point to be repaired.
In technique scheme: if a large amount of infiltrations occur in described dry foundation pit, can be in described dry foundation pit peace
Dress immersible pump.
The present invention has following technological merit: 1, cofferdam of the present invention adopts modular buoyancy tank steel construction, is easy to deposit, fortune
Defeated, rise and fall in water in achievable cofferdam, is conducive to underwater construction and the dismounting in cofferdam, ditch water flow will not be polluted, and
Repeatable utilization, cost-effective.
2nd, cofferdam of the present invention bottom sets one layer of valve rubber, prevents it with central line tunnel concrete lining in south plate directly contact and causes two
Secondary destruction, plays certain sealing effect under steel cofferdam working condition simultaneously.
3rd, cofferdam of the present invention be arranged as in channel " [" type simultaneously forms semi-wrapped style foundation ditch, by restraint narrow after channel hydraulic pipeline,
Channel still has higher conveyance power of water, and Middle Line Project For Transferring Water From South To North general main canal conveyance power of water be can reach with the 75%- of designed capacity
90% about.
4th, the present invention can be greatly reduced the head in foundation ditch, effectively reduce the uplift pressure that foundation ditch inside lining is born, make base
The uplift pressure that hole inside lining is undertaken is within the scope of structure can be born, it is to avoid lining cutting occurs uplift pressure to destroy.
5th, the present invention solves channel under not interrupting water supply conditions and repairs problem, has larger social benefit and economic effect
Benefit.
Brief description
Fig. 1 horizontal layout of the present invention schematic diagram.
Fig. 2 a-a of the present invention face drawing in side sectional elevation.
In figure: water flowing channel 1, liner plate 2, canal slope 3, cofferdam 4, aerofluxuss, discharge structure 4.1, dry foundation pit 5, impervious barrier
6th, drainage blanket 7, Water penetrative flexible pipe 8, non-return valve 9, obturator 10, immersible pump 11.
Specific embodiment
Describe the performance of the present invention below in conjunction with the accompanying drawings in detail, but they do not constitute limitation of the invention, only
For example, simultaneously by illustrate advantages of the present invention will become clearer from easy to understand.
Technical research is carried out to one phase of Middle Line Project For Transferring Water From South To North general main canal, this engineering adopts trapezoidal cross-section, tunneling boring is cast-in-place
Concrete lining thickness of slab 8cm-10cm, liner plate bottom adopts impermeable composite geomembrane, and channel drainage system is typically by draining pad
Layer, the composition such as closed drain (Water penetrative flexible pipe), non-return valve, have the representativeness of long distance water transfer channel.
Canal lining reparation of the present invention do not interrupt cofferdam semi-wrapped style foundation ditch under the conditions of water delivery it is characterised in that: water flowing channel 1
Canal slope 3 including the liner plate 2 laid along water delivery direction with along the described symmetrically arranged inclination of liner plate 2；
Cofferdam 4 is provided with water flowing channel 1, described cofferdam 4 be located at the described side of water flowing channel 1 and with canal slope
3 are fixed together；The described bottom in cofferdam 4 and described water flowing channel 1 form dry foundation pit 5,
Described cofferdam 4 is modular buoyancy tank steel construction, is internally provided with aerofluxuss, discharge structure in the cofferdam 4 told
4.1, the bottom in described cofferdam 4 is provided with valve rubber, described valve rubber is close on described liner plate 2；Prevent from enclosing
Secondary injury is caused to central line tunnel concrete lining in south in weir 4；
It is made up of several casings in described cofferdam 4, each casing is directly connected by lock, and in adjacent casing
Between be provided with water sealing structure；Casing end and both sides setting sealing, module is bolted together to combine and forms overall cofferdam, is easy to
Transport and Fast Installation.
It is provided with drainage blanket 7 in the bottom of described liner plate 2 and impervious barrier 6, equidistantly install in described drainage blanket 7
There is Water penetrative flexible pipe 8, be provided with non-return valve 9 in the end of each described Water penetrative flexible pipe 8, in described dry foundation pit 5 periphery
On obturator 10 is installed on the non-return valve 9 of dismounting, inverse between the edge in described obturator 10 and described cofferdam 4
Only it is mounted on immersible pump 11 on valve 9, immersible pump 11 draws water and discharges to outside hole on the spot.
Described cofferdam 4 is in that " [" type structure forms semi-wrapped style foundation ditch, safeguards channel side, pass through in canal for water conveyance 1
Channel hydraulic pipeline after bundle is narrow.
Described obturator 10 is arranged on the dismounting on the described second row of dry foundation pit 5 periphery or some rows
(it is not each row's non-return valve 9 removed after second row, simply removes a certain row's check after second row on non-return valve 9
Valve 9, including second row non-return valve 9).
Described water flowing channel 1 for inverted trapezoidal structure or rectangular configuration, described dry foundation pit 5 and described water flowing canal
Between road 1, the drainage blanket 7 of setting remains connection.
The opposite side of described dry foundation pit 5 remains water flowing, by channel hydraulic pipeline after narrow for the bundle；Keep described enclosing
Non-return valve 9 in weir 4 keeps opening-wide state.
If a large amount of infiltrations occur in described dry foundation pit 5, can be in described dry foundation pit 5 installing submersible pump 11.
Canal lining reparation of the present invention do not interrupt cofferdam semi-wrapped style foundation ditch under the conditions of water delivery method it is characterised in that: bag
Include following steps；
1., obturator is installed: the side of described water flowing channel 1 is provided with cofferdam 4, described cofferdam 4 and bottom
Lining cutting forms dry foundation pit 5, and described dry foundation pit 5 does not carry out draining in advance, removes dry foundation pit 5 periphery second or some
After row's non-return valve 9, then remove, removing non-return valve 9, the in the hole installation obturator 10 staying, described obturator 10 blocks logical
Water in water channel road 1 and the water stream channel of bottom drainage blanket 7；
2., installing submersible pump: in the range of obturator 10 obstruction outside dry foundation pit 5 and dry foundation pit 5 border between
It is respectively mounted immersible pump 11 on the interior aperture of non-return valve 9；
3., do foundation pit internal drainage to process: the non-return valve 9 in dry foundation pit 5 region described in keeping opens wide all the time；
4., cofferdam demolition: after the completion of channel is repaired, cofferdam 4 is dismantled as several buoyancy tanks, by tractor tug by buoyancy tank water
Fortune or disembarkation land transportation are repaired to next point to be repaired.
One phase of Middle Line Project For Transferring Water From South To North general main canal is carried out with technical research: the canal dike of analytical calculation channel bankets infiltration coefficient
For 1 × 10-4Cm/s, ground is the infiltration coefficient of uniform aquiclude is 1 × 10-5Cm/s, channel water level is 7.2m, even if
Phreatic high is the situation of 10m, is 0-1.6m head using the uplift pressure that canal liner plate in the technical program foundation ditch bears；
Arrange micro-drainage pump using the technical program in foundation ditch to draw water, the uplift pressure that in foundation ditch, canal liner plate bears is 0m simultaneously
Head.
Using the technical program, in foundation ditch, water percolating capacity is obviously reduced, foundation ditch internal drainage and liner plate construction interfere little,
Be conducive to the repairing construction of foundation ditch inside lining plate.Analytical calculation shows to arrange special obstruction outside foundation ditch using the technical program
Device, special micro-drainage pump draw water, and level of ground water is that during 0m, foundation ditch extracardiac pumping amount is 134m3/ d, interior water percolating capacity is only 0.3m3/d；
The technical program arranges micro-drainage pump in foundation ditch simultaneously and draws water, and level of ground water is that during 10m, foundation ditch extracardiac pumping amount is 140m3/
D, in foundation ditch, water percolating capacity is 4.3m3/d.
Claims (10)
1. canal lining reparation do not interrupt cofferdam semi-wrapped style foundation ditch under the conditions of water delivery it is characterised in that: water flowing channel (1) includes edge
The liner plate (2) of water delivery direction laying and the canal slope (3) along the described symmetrically arranged inclination of liner plate (2)；
Cofferdam (4) is provided with water flowing channel (1), described cofferdam (4) be located at the described side of water flowing channel (1) and with
Canal slope (3) is fixed together；The described bottom in cofferdam (4) and described water flowing channel (1) form dry foundation pit (5),
Described cofferdam (4) is modular buoyancy tank steel construction, is internally provided with aerofluxuss, discharge structure in described cofferdam (4)
(4.1), the bottom in described cofferdam (4) is provided with valve rubber, and described valve rubber is close on described liner plate (2)；
Be made up of several casings in described cofferdam (4), each casing is directly connected by lock, and adjacent casing it
Between be provided with water sealing structure；
It is provided with drainage blanket (7) in the bottom of described liner plate (2) and impervious barrier (6), in described drainage blanket (7) equidistantly
Water penetrative flexible pipe (8) is installed, is provided with non-return valve (9) in the end of each described Water penetrative flexible pipe (8), described dry
Place outside foundation ditch (5) and obturator (10) is provided with the non-return valve (9) of dismounting, enclose with described in described obturator (10)
It is mounted on immersible pump (11) on non-return valve (9) between the edge on weir (4).
2. cofferdam semi-wrapped style foundation ditch under the conditions of water delivery is not interrupted in canal lining reparation according to claim 1, and its feature exists
In: described cofferdam (4) is in " [" type structure in canal for water conveyance (1).
3. cofferdam semi-wrapped style foundation ditch under the conditions of water delivery, its feature are not interrupted in canal lining reparation according to claim 1 and 2
It is: described obturator (10) is arranged on the inverse of the described second row of dry foundation pit (5) periphery or some rows dismounting
Only on the aperture of valve (9).
4. cofferdam semi-wrapped style foundation ditch under the conditions of water delivery is not interrupted in canal lining reparation according to claim 3, and its feature exists
In: between described dry foundation pit (5) and described water flowing channel (1), the drainage blanket (7) of setting remains and connects.
5. cofferdam semi-wrapped style foundation ditch under the conditions of water delivery is not interrupted in canal lining reparation according to claim 4, and its feature exists
It is inverted trapezoidal structure in: described water flowing channel (1).
6. cofferdam semi-wrapped style foundation ditch under the conditions of water delivery, its feature are not interrupted in the canal lining reparation according to claim 4 or 5
It is: the opposite side of described dry foundation pit (5) remains water flowing.
7. cofferdam semi-wrapped style foundation ditch under the conditions of water delivery is not interrupted in canal lining reparation according to claim 6, and its feature exists
In: the non-return valve (9) in cofferdam (4) described in keeping keeps opening-wide state.
8. cofferdam semi-wrapped style foundation ditch under the conditions of water delivery is not interrupted in canal lining reparation according to claim 7, and its feature exists
In: in described dry foundation pit (5), immersible pump (11) is installed.
9. under the conditions of water delivery is not interrupted in the canal lining reparation according to any claim in claim 1-8, cofferdam is partly enclosed
The method of formula foundation ditch it is characterised in that: comprise the steps；
1., obturator is installed: the side of described water flowing channel (1) is provided with cofferdam (4), described cofferdam (4) and bottom
Lining cutting (2) form dry foundation pit (5), described dry foundation pit (5) does not carry out draining in advance, removes dry foundation pit (5) periphery
Second or some row's non-return valves (9) after, then removing non-return valve (9) and removing the in the hole that stays, obturator (10), institute are installed
The obturator (10) stated blocks the water stream channel of the water in water flowing channel (1) and bottom drainage blanket (7)；
2., installing submersible pump: in the range of the outer obturator (10) of dry foundation pit (5) blocks with dry foundation pit (5) border it
It is respectively mounted immersible pump (11) on the interior aperture of non-return valve (9)；
3., do foundation pit internal drainage to process: the non-return valve (9) in dry foundation pit (5) region described in keeping opens wide all the time；
4., cofferdam demolition: after the completion of channel is repaired, cofferdam (4) are dismantled as several buoyancy tanks, by tractor tug by buoyancy tank water transport
Or disembarkation land transportation repaired to next point to be repaired.
10. the method that cofferdam semi-wrapped style foundation ditch under the conditions of water delivery is not interrupted in canal lining reparation according to claim 9, its
It is characterised by: if a large amount of infiltrations occur in described dry foundation pit (5), can be in described dry foundation pit (5) installing submersible pump
(11).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610916319.8A CN106337424B (en) | 2016-10-20 | 2016-10-20 | Cofferdam semi-wrapped style foundation pit and method under the conditions of water delivery are not interrupted in canal lining reparation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610916319.8A CN106337424B (en) | 2016-10-20 | 2016-10-20 | Cofferdam semi-wrapped style foundation pit and method under the conditions of water delivery are not interrupted in canal lining reparation |
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| CN106337424A true CN106337424A (en) | 2017-01-18 |
| CN106337424B CN106337424B (en) | 2018-06-15 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108775020A (en) * | 2018-07-05 | 2018-11-09 | 哈尔滨工业大学 | Self-balancing steel sheet-pile cofferdam and its method for repairing underwater concrete liner plate |
| CN110409378A (en) * | 2019-09-02 | 2019-11-05 | 黄河勘测规划设计研究院有限公司 | Repair method of not cutting off the water for large channel |
| CN110424333A (en) * | 2019-08-12 | 2019-11-08 | 长江勘测规划设计研究有限责任公司 | Canal lining structure repairs cofferdam equipment and assembling method dryly under water delivery state |
| CN110453706A (en) * | 2019-09-18 | 2019-11-15 | 河南省水利勘测设计研究有限公司 | Underwater canopy cofferdam for channel side slopes reparation |
| CN110565665A (en) * | 2019-09-18 | 2019-12-13 | 河南省水利勘测设计研究有限公司 | Construction method for repairing channel side slope without water cut based on canopy type cofferdam |
| CN111648311A (en) * | 2020-05-29 | 2020-09-11 | 中国葛洲坝集团第一工程有限公司 | Enclosure device for maintaining connecting seam of aqueduct without water interruption |
| CN111648312A (en) * | 2020-05-29 | 2020-09-11 | 中国葛洲坝集团第一工程有限公司 | Construction method for maintaining connecting joint of aqueduct without water interruption |
| CN113356147A (en) * | 2021-06-21 | 2021-09-07 | 山东省水利科学研究院 | Water-blocking construction device |
| CN114635440A (en) * | 2022-04-18 | 2022-06-17 | 中水北方勘测设计研究有限责任公司 | Cofferdam assembly for water channel overhaul with water |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108775020B (en) * | 2018-07-05 | 2020-04-28 | 哈尔滨工业大学 | Self-balancing steel sheet pile cofferdam and method for repairing underwater concrete lining plate by using same |
| CN108775020A (en) * | 2018-07-05 | 2018-11-09 | 哈尔滨工业大学 | Self-balancing steel sheet-pile cofferdam and its method for repairing underwater concrete liner plate |
| CN110424333B (en) * | 2019-08-12 | 2024-04-02 | 长江勘测规划设计研究有限责任公司 | Cofferdam repairing equipment and assembly method for canal lining structure in water delivery state |
| CN110424333A (en) * | 2019-08-12 | 2019-11-08 | 长江勘测规划设计研究有限责任公司 | Canal lining structure repairs cofferdam equipment and assembling method dryly under water delivery state |
| CN110409378A (en) * | 2019-09-02 | 2019-11-05 | 黄河勘测规划设计研究院有限公司 | Repair method of not cutting off the water for large channel |
| CN110453706A (en) * | 2019-09-18 | 2019-11-15 | 河南省水利勘测设计研究有限公司 | Underwater canopy cofferdam for channel side slopes reparation |
| CN110565665A (en) * | 2019-09-18 | 2019-12-13 | 河南省水利勘测设计研究有限公司 | Construction method for repairing channel side slope without water cut based on canopy type cofferdam |
| CN110453706B (en) * | 2019-09-18 | 2024-06-04 | 河南省水利勘测设计研究有限公司 | Underwater awning type cofferdam for repairing side slope of channel |
| CN111648311A (en) * | 2020-05-29 | 2020-09-11 | 中国葛洲坝集团第一工程有限公司 | Enclosure device for maintaining connecting seam of aqueduct without water interruption |
| CN111648311B (en) * | 2020-05-29 | 2021-12-03 | 中国葛洲坝集团第一工程有限公司 | Enclosure device for maintaining connecting seam of aqueduct without water interruption |
| CN111648312A (en) * | 2020-05-29 | 2020-09-11 | 中国葛洲坝集团第一工程有限公司 | Construction method for maintaining connecting joint of aqueduct without water interruption |
| CN113356147A (en) * | 2021-06-21 | 2021-09-07 | 山东省水利科学研究院 | Water-blocking construction device |
| CN114635440A (en) * | 2022-04-18 | 2022-06-17 | 中水北方勘测设计研究有限责任公司 | Cofferdam assembly for water channel overhaul with water |
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|---|---|
| CN106337424B (en) | 2018-06-15 |
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