CN105951853A - Improved tetrahedron throwing material for closure work - Google Patents
Improved tetrahedron throwing material for closure work Download PDFInfo
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- CN105951853A CN105951853A CN201610343703.3A CN201610343703A CN105951853A CN 105951853 A CN105951853 A CN 105951853A CN 201610343703 A CN201610343703 A CN 201610343703A CN 105951853 A CN105951853 A CN 105951853A
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- tetrahedron
- jettisoninging
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- jettisoning
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- 239000000463 material Substances 0.000 title claims abstract description 103
- 230000001186 cumulative effect Effects 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 22
- 239000007787 solid Substances 0.000 abstract description 11
- 230000000149 penetrating effect Effects 0.000 abstract 1
- 238000010276 construction Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000002379 ultrasonic velocimetry Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 230000000977 initiatory effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000035515 penetration Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 230000007306 turnover Effects 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000021186 dishes Nutrition 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- FWQHNLCNFPYBCA-UHFFFAOYSA-N fluoran Chemical compound C12=CC=CC=C2OC2=CC=CC=C2C11OC(=O)C2=CC=CC=C21 FWQHNLCNFPYBCA-UHFFFAOYSA-N 0.000 description 1
- ZZUFCTLCJUWOSV-UHFFFAOYSA-N furosemide Chemical compound C1=C(Cl)C(S(=O)(=O)N)=CC(C(O)=O)=C1NCC1=CC=CO1 ZZUFCTLCJUWOSV-UHFFFAOYSA-N 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2200/00—Geometrical or physical properties
- E02D2200/16—Shapes
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Revetment (AREA)
Abstract
The invention belongs to the field of river closure of hydraulic engineering, and provides an improved tetrahedron throwing material for closure work. The material comprises a tetrahedron body; through holes communicated with each other and penetrating through each surface of the tetrahedron body are formed in the tetrahedron body; and the density of the tetrahedron body is 2400-3700 kg/m3. Compared with a traditional solid regular tetrahedron throwing material, the improved tetrahedron throwing material is lower in suffered water meeting resistance, higher in stability in water currents and lower in loss rate in the water currents, and can reduce the closure difficulty.
Description
Technical field
The invention belongs to hydraulic engineering river cut-off field, jettisoning material particularly to a kind of modified model tetrahedron for dam project.
Background technology
Dam project is within the shortest time, current in former river course are blocked at barrage building future insufficiency (Longkou) place, the current in river course are allowed to be led off by other place or to retain the foundation ditch of formation construction at dry land, being a key issue in construction of hydro project, it is the item controlled affecting construction speed.During blocking current, the current in river course are disorderly, underwater topography and in an opposite direction dike shape constantly change with the difference attacking and occupying the period, be easily caused cut-off material loss and in an opposite direction dike cave in, increase closure difficulty.
Many experimentatioies and case history show, the dike loss with cut-off material of caving in is all relevant with material stability after jettisoninging of jettisoninging in an opposite direction, jettisoning material can one-time-reach-place, steady statue can be reached in relatively short distance seem most important.Artificial prefabricated material of jettisoninging is easier to put in place in torrent, there is preferable stability, can effectively protect dike closure dyke end slump in an opposite direction, material of jettisoninging is stoped to run off, alleviate closure difficulty, the dam projects such as such as Three Gorges Diversion channel closure, Xi Luo Du reservoir engineering dam and Ge Zhou Ba hydroelectric pivotal project dams all employ artificial prefabricated material of jettisoninging.Existing artificial prefabricated material of jettisoninging mainly has solid concrete tetrahedron (see Fig. 1), solid concrete hexahedron (solid concrete square) and reinforced gabion string.Substantial amounts of experimentation shows with case history, owing to solid concrete tetrahedron and the hexahedron fluoran stream surface in water is relatively big, center of gravity is higher, the resistance to water-flow effect being subject to is obvious, influence of dynamic water lasts longer, poor stability, and reinforced gabion string there is also, and stability of material is the best and losing issue, thus existing solid concrete tetrahedron, hexahedron and reinforced gabion string are unsatisfactory in the effect of difficulty period of damming, it is necessary existing artificial prefabricated material of jettisoninging is optimized, to obtain effect of preferably damming.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art, there is provided and jettisoning material for the modified model tetrahedron of dam project, to reduce the resistance that meets water that material of jettisoninging is subject in current, improve material stability in current of jettisoninging, reduce material turnover rate in current of jettisoninging, thus reduce closure difficulty.
The modified model tetrahedron for dam project that the present invention provides is jettisoninged material, including tetrahedron body, is provided with the through hole being mutually communicated and running through each face of tetrahedron body in described tetrahedron body, and the density of tetrahedron body is 2400kg/m3～3700kg/m3。
Above-mentioned modified model tetrahedron jettisoning material technical scheme in, at least one face of tetrahedron body is provided with the groove in this face through, preferably scheme is to be equipped with the groove in this face through on each face of tetrahedron body, when at least two face of tetrahedron body is provided with the groove in this face through, groove on adjacent two faces is the most through, in order to obtain superior technique effect, described groove preferably connects with through hole, discharges from groove with the current in through hole after being conducive to this material of jettisoninging to jettisoning.
Above-mentioned modified model tetrahedron jettisoning material technical scheme in, when tetrahedron body is provided only with described through hole, the volume of through hole is the 5%～35% of tetrahedron body cumulative volume, when tetrahedron body is provided with described through hole and groove, the cumulative volume of through hole and groove is the 5%～35% of tetrahedron body cumulative volume.
Above-mentioned modified model tetrahedron jettisoning material technical scheme in, the difference of tetrahedron body each bar rib length be less than 15%, above-mentioned tetrahedron body is preferably positive triangular pyramid or positive tetrahedron.
Above-mentioned modified model tetrahedron jettisoning material technical scheme in, the rib length of tetrahedron body determines according to physical conditions such as scale, current and the landform of dam project, the rib a length of 2～4.5m of usual tetrahedron body.
Above-mentioned modified model tetrahedron material of jettisoninging generally is formed by concreting, in order to increase the density of material of jettisoninging, can add iron block when pouring in concrete, metal material that lead isodensity is bigger than concrete.
Compared with prior art, the method have the advantages that
1. the material of jettisoninging for dam project that the present invention provides is the material of jettisoninging of a kind of new structure, this material of jettisoninging is formation after the through hole arranging in tetrahedron body and being mutually communicated and run through each face of tetrahedron body, after jettisoninging, current can flow through from the through hole of material of jettisoninging, thus reduce the resistance that meets water that material of jettisoninging is subject in current, improve material stability in current of jettisoninging, reduce material turnover rate in current of jettisoninging, and, the existence of through hole adds the water penetration of material of jettisoninging, and then increase the leakage of dike in an opposite direction, reduce the flow at Longkou of damming and water levels of upstream and downstream drop, it is thus possible to reduction closure difficulty.
2. the modified model tetrahedron be applicable to dam project that the present invention provides is jettisoninged material, on the basis of in tetrahedron body, setting is mutually communicated and runs through the through hole in each face of tetrahedron body, on at least one face of tetrahedron body, also it is provided with the through groove being somebody's turn to do, groove can increase the water penetration of material of jettisoninging further, the setting of groove is not only advantageous to current and passes through, and the engaging each other of the material that is conducive to jettisoninging, thus synthetically promote material stability in current of jettisoninging.
3. model experiment shows, the present invention provide modified model tetrahedron jettisoning material whether by meet stream or the back of the body stream in the way of jettisoning, stop flow velocity in current is all higher than the positive tetrahedron of existing solid construction and jettisonings material, and material stability in current of jettisoninging of the present invention is more preferable.
4. the flow during the closure of dam project Longkou is mainly from water conservancy diversion building shunting, but the scale of water conservancy diversion building is easily subject to the restriction of landform and cost, when the scale of water conservancy diversion building is less, easily cause Longkou flow when damming and flow velocity is excessive, and then cause dam difficulty and material loss of jettisoninging, material of jettisoninging of the present invention is provided with through hole, or it is simultaneously provided with through hole and groove, there is certain water penetration, this material of jettisoninging is used can suitably to increase the leakage of dike in an opposite direction, thus share part Longkou flow to reduce Longkou flow and Longkou flow velocity in difficulty section of damming, thus reduce closure difficulty, reduce material of jettisoninging to run off.
Accompanying drawing explanation
Fig. 1 is the structural representation of the material of jettisoninging of existing solid positive tetrahedron structure；
Fig. 2 is the structural representation of the material of jettisoninging of the first version of the present invention；
Fig. 3 is the structural representation of the material of jettisoninging of the second version of the present invention；
Fig. 4 is the structural representation of the material of jettisoninging of the third version of the present invention；
Fig. 5 is the structural representation of the material of jettisoninging of the 4th kind of version of the present invention；
Fig. 6 is the left surface of the tetrahedron body of the material of jettisoninging in Fig. 5 and bottom surface upper groove and via openings position view；
Fig. 7 is the right flank of the tetrahedron body of the material of jettisoninging in Fig. 5 and trailing flank upper groove and via openings position view；
Fig. 8 is to use tank measurement apparatus to measure the schematic diagram of material stop flow velocity in current of jettisoninging in embodiment 5；
In figure, 1 through hole, 2 grooves, 3 tetrahedron bodies, 4 solid positive tetrahedrons jettisoning material, 5 tanks, 6 disappear wave grid, 7 probes, 8 signal processors, 9 data lines, 10 computers, 11 jettisoning material, the h depth of water, L1The rib length of positive tetrahedron, L2The positive length of side of triangular pyramid equilateral triangle bottom surface, L3The waist of positive three isosceles triangle sides of triangular pyramid is long.
Detailed description of the invention
Combine accompanying drawing below by embodiment and the modified model tetrahedron for dam project of the present invention is jettisoninged material and using effect is described further.
Embodiment 1
In the present embodiment, the jettisoning structural representation of material of modified model tetrahedron for dam project is shown in Fig. 2, and including tetrahedron body 3, described tetrahedron body 3 is positive tetrahedron, tetrahedron body is provided with the through hole 1 being mutually communicated and running through each face of tetrahedron body, the long L of rib of positive tetrahedron1=2.0m, through hole 1 is made up of the cylindrical hole that four shapes are identical, the aperture, one end in the hole of each cylinder is positioned at the center in each face of tetrahedron body, other end aperture is positioned at the center of tetrahedron body, and be mutually communicated in the center of tetrahedron body, the cumulative volume of through hole 1 accounts for the 35% of tetrahedron body cumulative volume, and this material of jettisoninging is formed by concreting, and the density of tetrahedron body is 2400kg/m3。
Embodiment 2
In the present embodiment, the jettisoning structural representation of material of modified model tetrahedron for dam project is shown in Fig. 3, including tetrahedron body 3, described tetrahedron body 3 is positive triangular pyramid, tetrahedron body is provided with the through hole 1 being mutually communicated and running through each face of tetrahedron body, length of side L of positive triangular pyramid equilateral triangle bottom surface2=3.2m, the long L of waist of positive three isosceles triangle sides of triangular pyramid3=2.8m, through hole 1 is made up of the hole that cross section is triangle that four shapes are identical, each cross section is the center that the aperture, one end, hole of triangle is positioned at each face of tetrahedron body, other end aperture is positioned at the center of tetrahedron body, and be mutually communicated in the center of tetrahedron body, the cumulative volume of through hole 1 accounts for the 5% of tetrahedron body cumulative volume, and this material of jettisoninging is formed by concreting, and the density of tetrahedron body is 2500kg/m3。
Embodiment 3
In the present embodiment, the jettisoning structural representation of material of modified model tetrahedron for dam project is shown in Fig. 4, and including tetrahedron body 3, described tetrahedron body 3 is positive tetrahedron, tetrahedron body is provided with the through hole 1 being mutually communicated and running through each face of tetrahedron body, the long L of rib of positive tetrahedron1=4.5m, through hole 1 is made up of the cylindrical hole that four shapes are identical, the aperture, one end in the hole of each cylinder is positioned at the center in each face of tetrahedron body, other end aperture is positioned at the center of tetrahedron body, and be mutually communicated in the center of tetrahedron body, arranging one on the bottom surface of tetrahedron body and have through bottom recesses 2, described groove 2 and through hole open communication on tetrahedron body bottom surface, the cumulative volume of described through hole 1 and groove 2 accounts for the 15% of tetrahedron body cumulative volume.Described material of jettisoninging is formed by concreting, in order to increase the density of material of jettisoninging, placed lead in this jettisonings material when pouring, and the density of tetrahedron body is 3700kg/m3。
Embodiment 4
In the present embodiment, the jettisoning structural representation of material of the modified model tetrahedron for dam project is shown in Fig. 5, and including tetrahedron body 3, described tetrahedron body 3 is positive tetrahedron, the long L of rib of positive tetrahedron1=2.9m, through hole 1 is made up of the cylindrical hole that four shapes are identical, and the aperture, one end in the hole of each cylinder is positioned at the center in each face of tetrahedron body, and other end aperture is positioned at the center of tetrahedron body, and is mutually communicated in the center of tetrahedron body.
As shown in Figure 5, it is equipped with three on the left surface of the tetrahedron body of this material of jettisoninging and bottom surface (on the basis of the angle of Fig. 5) to be parallel to each other and the groove 2 of through left surface and bottom surface, and second groove on left surface and bottom surface and through hole open communication on left surface and bottom surface, left surface and bottom surface upper groove and via openings position are shown in Fig. 6, it is equipped with two on the right flank of the tetrahedron body of this material of jettisoninging and trailing flank (on the basis of the angle of Fig. 5) to be parallel to each other and the groove 2 of through right flank and trailing flank, right flank and trailing flank upper groove and via openings position are shown in Fig. 7.
The cumulative volume of through hole 1 and groove 2 accounts for the 35% of tetrahedron body cumulative volume.This material of jettisoninging is formed by concreting, in order to increase the density of material of jettisoninging, placed iron block in this jettisonings material when pouring, tetrahedron body density be 3000kg/m3。
Embodiment 5
In the present embodiment, investigate existing jettisoning material and material of jettisoninging of the present invention jettisoning after stability in current.
The first type is the material 4 of jettisoninging of the solid positive tetrahedron structure of existing concrete material, is 1-1# by this material number of jettisoninging, a length of 8cm of rib of this material of jettisoninging, and quality is 156.72g.
The second type material of jettisoninging of the present invention, the structure of the material of jettisoninging being similar to that in embodiment 1, including tetrahedron body 3, described tetrahedron body 3 is positive tetrahedron, tetrahedron body is provided with the through hole 1 being mutually communicated and running through each face of tetrahedron body, through hole 1 is made up of the cylindrical hole that four shapes are identical, the aperture, one end in the hole of each cylinder is positioned at the center in each face of tetrahedron body, the other end eats dishes without rice or wine to be positioned at the center of tetrahedron body, and is mutually communicated in the center of tetrahedron body.Including 4 kinds of specifications altogether, respectively numbered 2-1#, 2-2#, 2-3#, 2-4#, the rib length of material of jettisoninging, quality, through hole cumulative volume account for the situation of tetrahedron body cumulative volume and are shown in Table 1.
Jettisoning rib length, quality and the pore volume of material of table 1 the second type accounts for tetrahedron body cumulative volume situation
Tank measurement apparatus as shown in Figure 8 is used to measure the material 11 stop flow velocity under two kinds of operating modes of 35L/s and 55L/s of jettisoninging of above two type.Described tank measurement apparatus is made up of Rectangular Water Trough 5 and acoustic Doppler velocimetry (ADV current meter), described Rectangular Water Trough is made up of Rectangular Concrete base plate and transparent organic glass sidewall, the a length of 10.0m of tank, width is 0.39m, the degree of depth is 0.35m, floor level is arranged, and the roughness of base plate is 0.012, is mounted with the wave grid 6 that disappear at distance tank initiating terminal 2.4m.Described ADV current meter is made up of pop one's head in 7, signal processor 8, data line 9 and computer 10, and the probe 7 of described ADV current meter is arranged on the support above tank, and can move on support.
To tank, it is passed through current according to given flow rate from the initiating terminal of tank, the outlet that current flow through after tank through tank end is discharged, after the flow rate of water flow in tank is stable, in tank, one block of material 11 of jettisoninging is added at distance tank initiating terminal 5.0m, feed postition includes meeting stream and back of the body stream two kinds, material meeting after adding in tank of jettisoninging with current direction tank end movement and is finally stopped motion, jettisoninged material move distance in the sink by the steel ruler measurement of precision 1mm scale, the flow rate of water flow in tank is measured by ADV Flow speed measurer, when measuring flow rate of water flow, a flow velocity is measured every 5.0cm from tank bottom surface to the water surface, each section survey is left, in, at right three, take the meansigma methods of these flow velocitys as average current flow velocity.The distance moved in the sink according to flow rate of water flow and material of jettisoninging calculates the stop flow velocity of material of jettisoninging, and result is as shown in table 2.
Jettisoning under the different operating mode of table 2 the stop flow velocity of material
As shown in Table 1, the material of jettisoninging that the present invention provides is whether to meet streamStill stream is carried on the backMode jettisoning, the stop flow velocity in current is all higher than the positive tetrahedron of existing solid construction and jettisonings material, and material stability in current of jettisoninging the most of the present invention is more preferable.
Claims (10)
1. jettisoning material for the modified model tetrahedron of dam project, including tetrahedron body (3), it is characterised in that tetrahedron this
Being provided with the through hole (1) being mutually communicated and running through each face of tetrahedron body in body, the density of tetrahedron body is 2400
kg/m3～3700kg/m3。
Jettisoning material for the modified model tetrahedron of dam project the most according to claim 1, it is characterised in that tetrahedron body
At least one face be provided with the groove (2) in this face through.
Jettisoning material for the modified model tetrahedron of dam project the most according to claim 2, it is characterised in that described groove (2)
Connect with described through hole (1).
4. jettisoning material for the modified model tetrahedron of dam project according to described in any claim in claims 1 to 3, its
It is characterised by that, when tetrahedron body is provided only with described through hole (1), the volume of through hole is the 5%～35% of tetrahedron body cumulative volume,
When tetrahedron body is provided with described through hole (1) and groove (2), the cumulative volume of through hole (1) and groove (2) is tetrahedron
The 5%～35% of body cumulative volume.
5. jettisoning material for the modified model tetrahedron of dam project according to described in any claim in claims 1 to 3, its
It is characterised by that the difference of tetrahedron body each bar rib length is less than 15%.
Jettisoning material for the modified model tetrahedron of dam project the most according to claim 4, it is characterised in that tetrahedron body
The difference of each bar rib length is less than 15%.
7. jettisoning material for the modified model tetrahedron of dam project according to described in any claim in claims 1 to 3, its
It is characterised by that tetrahedron body is positive triangular pyramid or positive tetrahedron.
Jettisoning material for the modified model tetrahedron of dam project the most according to claim 4, it is characterised in that tetrahedron body
For positive triangular pyramid or positive tetrahedron.
Jettisoning material for the modified model tetrahedron of dam project the most according to claim 5, it is characterised in that tetrahedron body
For positive triangular pyramid or positive tetrahedron.
Jettisoning material for the modified model tetrahedron of dam project the most according to claim 6, it is characterised in that tetrahedron this
Body is positive triangular pyramid or positive tetrahedron.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610343703.3A CN105951853B (en) | 2016-05-20 | 2016-05-20 | Modified tetrahedron for dam project is jettisoninged material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610343703.3A CN105951853B (en) | 2016-05-20 | 2016-05-20 | Modified tetrahedron for dam project is jettisoninged material |
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| CN105951853A true CN105951853A (en) | 2016-09-21 |
| CN105951853B CN105951853B (en) | 2017-11-14 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113089571A (en) * | 2021-04-01 | 2021-07-09 | 长江水利委员会长江科学院 | Assembled water-permeable energy-dissipating tetrahedral embankment plugging member and construction method thereof |
| CN114215084A (en) * | 2021-12-17 | 2022-03-22 | 中国十九冶集团有限公司 | Water flow adjusting device, steel cofferdam bulkhead device and steel cofferdam positioning pile construction method |
| CN115233709A (en) * | 2022-05-17 | 2022-10-25 | 中国水利水电第九工程局有限公司 | Closure device and closure method for closure gap of riverbed cofferdam |
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| CN2088125U (en) * | 1991-03-20 | 1991-11-06 | 彭方山 | Multi-functional high-efficient sinking block |
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| CN102330434A (en) * | 2010-07-13 | 2012-01-25 | 长江水利委员会长江科学院 | Throwing material for lightening interception difficulty and protecting dikes of rivers |
| CN202559296U (en) * | 2012-04-11 | 2012-11-28 | 苏州大学 | Hollow triangular cone of river dyke shore closure |
| CN203144966U (en) * | 2013-04-17 | 2013-08-21 | 中国葛洲坝集团股份有限公司 | Precast concrete for closure casting |
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2016
- 2016-05-20 CN CN201610343703.3A patent/CN105951853B/en not_active Expired - Fee Related
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| CN2088125U (en) * | 1991-03-20 | 1991-11-06 | 彭方山 | Multi-functional high-efficient sinking block |
| US20080286045A1 (en) * | 2005-07-11 | 2008-11-20 | Josep Ramon Medina Folgado | Element Used to Form Breakwaters |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113089571A (en) * | 2021-04-01 | 2021-07-09 | 长江水利委员会长江科学院 | Assembled water-permeable energy-dissipating tetrahedral embankment plugging member and construction method thereof |
| CN114215084A (en) * | 2021-12-17 | 2022-03-22 | 中国十九冶集团有限公司 | Water flow adjusting device, steel cofferdam bulkhead device and steel cofferdam positioning pile construction method |
| CN115233709A (en) * | 2022-05-17 | 2022-10-25 | 中国水利水电第九工程局有限公司 | Closure device and closure method for closure gap of riverbed cofferdam |
| CN115233709B (en) * | 2022-05-17 | 2024-06-21 | 中国水利水电第九工程局有限公司 | Closure device and closure method for closure of riverbed cofferdam tap |
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| Publication number | Publication date |
|---|---|
| CN105951853B (en) | 2017-11-14 |
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