CN114790716A - Reservoir gate sand control method based on movable guide pile group - Google Patents
Reservoir gate sand control method based on movable guide pile group Download PDFInfo
- Publication number
- CN114790716A CN114790716A CN202210466097.XA CN202210466097A CN114790716A CN 114790716 A CN114790716 A CN 114790716A CN 202210466097 A CN202210466097 A CN 202210466097A CN 114790716 A CN114790716 A CN 114790716A
- Authority
- CN
- China
- Prior art keywords
- pile
- flow
- guide
- water
- sand
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
- E02B3/02—Stream regulation, e.g. breaking up subaqueous rock, cleaning the beds of waterways, directing the water flow
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/24—Prefabricated piles
- E02D5/30—Prefabricated piles made of concrete or reinforced concrete or made of steel and concrete
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
- E02D7/24—Placing by using fluid jets
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D9/00—Removing sheet piles bulkheads, piles, mould-pipes or other moulds or parts thereof
- E02D9/02—Removing sheet piles bulkheads, piles, mould-pipes or other moulds or parts thereof by withdrawing
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Mechanical Engineering (AREA)
- Barrages (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses a reservoir gate sand control method based on a movable guide pile group, which comprises the following steps of: the first step is to drive the guide piles; two rows of guide piles are drilled at the intersection of the main flow and the branch flow of the reservoir, and the diameter D of each guide pile is the same; each guide pile and two adjacent guide piles form an equilateral triangle, and the side length of the triangle is less than or equal to 3D, so that a pile group forms a water retaining structure; the second step is to measure the flow rate; and the third step is pile pulling, and a guide pile at the position with the maximum flow velocity is pulled out by using a pile pulling device. By adopting the treatment method, the dam and the gate which consume huge capital are not required to be modified, the sand digging operation is not required to be carried out, only the piling, the speed measurement and the pile pulling are required, the cost is very low compared with the dam construction and the sand digging operation, the operation is very simple and convenient, the operation is not required to be carried out after the proper water level is waited, the operation can be carried out at any time, and the problem of timeliness of the treatment of the blocking gate sand is solved.
Description
Technical Field
The invention relates to the technical field of river channel treatment.
Background
Part of the main flow of the reservoir has a side flow. When the reservoir stores water, the water level of the main flow in the reservoir continuously rises, and the water level difference between the main flow and the branch flow is reduced or even disappears after the water level of the main flow rises. Therefore, at the junction of the branch flow and the main flow, the flow of water flowing from the branch flow to the main flow inevitably slows down and even flows backwards, and the silt carried by the main flow of water is deposited at the junction with the branch flow to form a silt body, which is called reservoir gate sand (as shown in fig. 2).
The reservoir gate sand can block the relation between the main stream and the branch stream, so that water in the branch stream cannot flow into the main stream, the effective storage capacity of the reservoir is greatly reduced, and the reservoir needs to be treated.
In the prior art, two main methods are used for treating reservoir gate sand.
Firstly, a dam and a gate are modified at the junction of a main flow and a branch flow, and the phenomenon of blocking gate sand is prevented through an artificial structure. The defects of the method are that the investment is huge, the engineering construction period is long, the method is only suitable for key engineering, and the method cannot be comprehensively popularized.
And secondly, after the gate sand appears, using a sand digging mechanical device to dig the sand to clean the gate sand. The defect of doing so is that the operation needs to be carried out in the season when the water level is lower, because the deep water level does not have the effective sand digging condition; and the sand digging site is the intersection of the branch flow and the main flow, so that the soil is soft, the sand digging amount is large, the operation difficulty is large, and the equipment cost and the labor cost are high (certainly, the cost is far less than the dam building cost).
Disclosure of Invention
The invention aims to provide a reservoir gate blocking sand treatment method based on a movable guide pile group, which is simple, convenient and feasible, has low cost and does not need to wait for operation time.
In order to achieve the purpose, the method for treating the reservoir gate sand based on the movable guide pile group comprises the following steps:
the first step is piling, and the pile is called a guide pile;
two rows of guide piles are drilled at the intersection of the main flow and the branch flow of the reservoir, and the straight lines where the two rows of guide piles are respectively located are parallel to each other and seal the intersection of the main flow and the branch flow of the reservoir; the two rows of guide piles are respectively a main flow side row pile and a branch flow side row pile, and the main flow side row pile and the branch flow side row pile form a pile group;
the extension direction of the straight line where the main flow side row pile and the branch flow side row pile are located is called the pile arranging direction, and the diameters D of the guide piles are the same; two rows of guide piles are alternately arranged in the pile arrangement direction;
each guide pile and two adjacent guide piles form an equilateral triangle, and the side length of the triangle is less than or equal to 3D, so that a pile group forms a water retaining structure;
the second step is to measure the flow rate;
when the water flow path needs to be cleaned at the gate blocking sand, measuring the water flow speed at each guide pile of the piles arranged at the side of the main flow;
the third step is pile pulling, a guide pile at the position with the maximum flow velocity is pulled out by using a pile puller, a pile group forms an opening at the pile pulling position after the guide pile is pulled out, because the position is the position with the maximum flow velocity of the pile group, main flow water flows gush into a branch flow from the opening and forms a water jet effect, a gully is punched on the gate sand, the gully is continuously enlarged and extends towards the branch flow direction under the continuous flushing of the water flow, and finally the main flow is communicated with the branch flow.
And if the condition that the intersection of the main flow and the branch flow is blocked by the gate sand occurs again when the reservoir stores water again, pile driving is carried out in situ at the pile pulling position when the gate sand is treated last time, and then the second step and the third step are carried out again.
When the intersection of the main flow and the branch flow does not need to treat the gate sand any more, all the guide piles are pulled out by using the pile pulling device, and the guide piles are recycled.
In the first step, jet flow piling is carried out, and a flow guide pile is a tubular pile;
when piling, a hydraulic hoisting crane is adopted to hoist the tubular pile, and the bottom of the tubular pile is provided with a nozzle with a water spraying direction vertically downward; the water inlet end of the high-pressure water pump is connected with a water source, the water outlet end of the high-pressure water pump is connected with a nozzle through a high-pressure hose, the high-pressure water pump is positioned on the ground or on a ship, and the high-pressure hose extends into the pipe pile from top to bottom and is connected with the nozzle; and starting the high-pressure water pump when the pile is driven, punching a pile hole on the gate sand or the riverbed below the tubular pile by using water jet, and punching the tubular pile while driving the tubular pile until the tubular pile is driven to a preset depth, and closing the high-pressure water pump to finish the pile driving operation.
The invention has the following advantages:
the main innovation points of the invention are as follows: the inventor researches and discovers that when adjacent guide piles in a pile group (a guide pile group, namely a pile group) are arranged in an equilateral triangle and the distance between the adjacent guide piles is less than or equal to 3 times of the diameter, the water flow is blocked most by the pile group, and the pile group is equivalent to a wall and blocks the water flow flowing fast. At the moment, even if no blocking sand exists, the water flow can only slowly pass through the pile group (the pile group cannot block the slow water flow); therefore, the pile group arranged in this way has a strong water blocking effect. The invention utilizes the water retaining effect, and then the flow velocity of each guide pile in the row piles at the side of the main flow is measured, the guide pile with the maximum flow velocity is pulled out, namely, an opening is formed on the water retaining wall, when the gate sand is treated, the water flow passing through the whole pile group in the main flow is guided to intensively wash the opening, so that the water power passing through the pile group is centralized at the pile pulling position, and punching holes are punched on the gate sand at the opening. The treatment method can be carried out at any time without waiting for the low water level operation time, is simple and easy to implement, does not need manual participation in the punching process after pile pulling, depends on the water retaining and flow guiding effects of the pile group, enables the main flow hydraulic power to naturally complete the task of communicating the main flow and the branch flow through punching, and has stronger timeliness (can be carried out at any time) and very low cost compared with the construction of dams and sand excavation.
In short, by adopting the treatment method, the dam and the gate which are high in cost are not required to be modified, the sand digging operation is not required, only piling, speed measuring and pile pulling are required, the cost is very low compared with that of dam construction and sand digging operation, the operation is very simple and convenient, the operation is not required to be carried out after a proper water level is waited, the operation can be carried out at any time, and the problem of timeliness of gate blocking sand treatment is solved (in the past, no matter the dam is modified or the sand digging operation is carried out, the operation time of waiting for a low water level is needed).
Although the two sides of the gully are still provided with the gate blocking sand, at the moment, the main stream is communicated with the branch stream, and the water of the branch stream can supply water to the reservoir when the water level of the reservoir is reduced (the water level of the main stream is reduced when the reservoir discharges water), so that the reservoir capacity of the reservoir is restored, and the aim of controlling the gate blocking sand is achieved. And, in the period of time that the branch water volume is big, the gully will be bigger and bigger under the action of water flow.
When the barrier sand is treated again, the second step and the third step are carried out again because the position of the maximum flow velocity position of the row piles on the main flow side can be changed after the barrier sand is formed again, so that the velocity measurement needs to be carried out again.
The jet flow piling operation is not restricted by the water level of the main flow, so that the piling time does not need to be selected, and the jet flow piling can be implemented at any time no matter the water level is high or low, thereby being very convenient.
Drawings
Fig. 1 is a schematic plan view of a pile group according to the present invention; in FIG. 1, the arrows indicate the water flow direction; the broken circle in fig. 1 represents the pulled-out guide pile;
FIG. 2 is a schematic plan view of a screen sand;
FIG. 3 is a schematic view of a water jet piling configuration;
FIG. 4 is a simulation diagram of a flow field at the junction of a main flow and a branch flow when a pile group is complete;
fig. 5 is an enlarged simulation diagram of a flow field at the intersection of a main flow and a branch flow after a guide pile is pulled out.
Detailed Description
As shown in fig. 1 to 3, the method for treating the reservoir gate sand based on the movable guide piles 2 comprises the following steps:
the first step is piling, which is called guide pile 2;
two rows of guide piles 2 are drilled at the intersection of the main flow 7 and the branch flow 8 of the reservoir, the guide piles 2 can be drilled before the formation of the gate sand 12 or after the formation of the gate sand 12, and the straight lines of the two rows of guide piles 2 are parallel to each other and seal the intersection of the main flow 7 and the branch flow 8 of the reservoir; the two rows of guide piles 2 are respectively a main flow side row pile 9 and a branch flow side row pile 10, and the main flow side row pile 9 and the branch flow side row pile 10 form a pile group;
the extension direction of the straight line where the main flow side row pile 9 and the branch flow side row pile 10 are located is called the row pile direction, and the diameters D of the guide piles 2 are the same; two rows of guide piles 2 are alternately arranged in the pile arrangement direction;
each guide pile 2 and two adjacent guide piles 2 enclose an equilateral triangle (the guide pile 2 in one main flow side row pile 9 and the guide piles 2 in two branch flow side row piles 10, or the guide pile 2 in two main flow side row piles 9 and the guide piles 2 in one branch flow side row pile 10), and the side length of the triangle is less than or equal to 3D, so that a pile group forms a water retaining structure;
the second step is to measure the flow rate;
when the water outlet flow path needs to be cleaned at the gate blocking sand 12, measuring the water flow speed at each guide pile 2 of the main flow side row piles 9, wherein the water flow speed is measured by the conventional technology and is not described again;
the third step is pile pulling, a guide pile 2 with the maximum flow velocity is pulled out by using a pile pulling device, a pile group forms a notch at the pile pulling position after the guide pile 2 is pulled out, because the position is the position with the maximum flow velocity of the pile group, the main flow 7 flows into a branch flow 8 from the notch to form a water jet effect, a gully 11 is punched on the gate blocking sand 12, the gully 11 is continuously enlarged and extends towards the branch flow 8 under the continuous flushing of the water flow, and finally the main flow is communicated with the branch flow 8. Pile pulling using pile extractors is conventional in the art and will not be described in detail.
By adopting the treatment method, the dam and the gate which consume huge capital do not need to be modified, the sand digging operation does not need to be carried out, and only piling, speed measuring and pile pulling are needed, so that the cost is very low compared with the dam construction and sand digging operation, the operation is very simple and convenient, the operation does not need to be carried out after waiting for proper water level, the operation can be carried out at any time, and the problem of timeliness of treating the blocking door sand 12 is solved (in the past, no matter whether the dam is modified or the sand digging operation is carried out, the operation needs to wait for proper low water level operation opportunity).
Although the gate sand 12 is still arranged on the two sides of the gully 11, because the main stream 7 and the branch stream 8 are communicated at the moment, when the water level of the reservoir is reduced (when the reservoir discharges water, the water level of the main stream 7 is reduced), the water of the branch stream 8 can be supplied to the reservoir, the reservoir capacity of the reservoir is recovered, and the purpose of treating the gate sand 12 is achieved. In addition, when the amount of water in the branch flow 8 is large, the gully 11 is also enlarged by the water flow.
If the situation that the intersection of the main flow 7 and the branch flow 8 is blocked by the gate sand 12 occurs again when the reservoir stores water again, pile driving is carried out in situ at the pile pulling position when the gate sand 12 is treated last time, and then the second step and the third step are carried out again.
When the barrier sand 12 is treated again, the second step and the third step are carried out again because the position where the flow velocity of the piles 9 on the main flow side is maximum may be changed after the barrier sand 12 is formed again, and thus the velocity measurement needs to be carried out again.
When the intersection of the main flow 7 and the branch flow 8 does not need to treat the gate sand 12 any more, all the guide piles 2 are pulled out by using the pile pulling device, so that the guide piles 2 are recycled.
In the first step, jet flow piling is carried out, and the guide pile 2 is a reinforced concrete pipe pile;
when piling, a hydraulic hoisting crane 1 is used for hoisting the reinforced concrete pipe pile, and the bottom of the reinforced concrete pipe pile is provided with a nozzle (the nozzle is the prior art and is not shown) which sprays water vertically downwards; the water inlet end of the high-pressure water pump 3 is connected with a water source (the water source is not shown in the figure), the water outlet end of the high-pressure water pump 3 is connected with a nozzle through a high-pressure hose 5, the high-pressure water pump 3 is positioned on the ground or on a ship, and the high-pressure hose 5 extends into the reinforced concrete pipe pile from top to bottom and is connected with the nozzle; and starting the high-pressure water pump 3 when the pile is driven, punching a pile hole 6 on the gate sand 12 or the riverbed below the reinforced concrete pipe pile by using water jet, putting the pipe pile down while punching until the pipe pile is lowered to a preset depth, and closing the high-pressure water pump 3 to finish the pile driving operation.
The jet flow piling operation is not restricted by the water level of the main flow 7, so that the piling time does not need to be selected, and the jet flow piling can be implemented at any time no matter the water level, and is very convenient.
The applicant simulates the flow velocity distribution at the junction of the main flow and the branch flow when the distances between the guide piles are different, as shown in fig. 4 and 5.
According to the simulation result, when the pile group is complete and the main flow velocity is 4m/s (meter/second), the maximum flow velocity in the branch is shown in table 1 when the distances between the guide piles are different:
TABLE 1
As can be seen from table 1, when the distance between the guide piles is 3D, the maximum flow velocity (the main flow flows to the branch flow) in the branch flow at the junction of the main flow and the branch flow is only 10% of the main flow, and it can be seen that the blocking effect of the guide pile group on the main flow is good at this time. When the distance between the guide piles is 4D, the maximum flow velocity in the branch flow rises to 42.5 percent of the flow velocity of the main flow, and the blocking effect is not obvious at the moment. When the distance between the guide piles is 2D, the distance between the guide piles is small, the piling cost is high, and the piling difficulty is increased, so that when the blocking effect is achieved, the distance between the guide piles is preferably 3D.
When the distance between the guide piles is 3D, one guide pile is removed, the flow field at the junction of the main flow and the branch flow is shown in figure 5, high flow velocity (see a red circle) is formed between the two guide piles at the branch flow side of the pile pulling position and reaches 3.1m/s, and the flow velocity is enough to punch a channel on the gate sand body, so that the main flow and the branch flow are communicated. This proves that a gully for communicating the main flow and the branch flow can be formed at the position of the barrier sand after the pile group is driven first and then a diversion pile is pulled out.
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention any modifications and equivalents.
Claims (4)
1. A reservoir gate sand control method based on a movable guide pile group is characterized by comprising the following steps:
the first step is piling, which is called guide pile;
two rows of guide piles are arranged at the intersection of the main flow and the branch flow of the reservoir, and the straight lines of the two rows of guide piles are parallel to each other and seal the intersection of the main flow and the branch flow of the reservoir; the two rows of guide piles are respectively a main flow side row pile and a branch flow side row pile, and the main flow side row pile and the branch flow side row pile form a pile group;
the extension direction of the straight line where the main flow side row pile and the branch flow side row pile are located is called the pile arrangement direction, and the diameters D of all the guide piles are the same; two rows of guide piles are alternately arranged in the pile arrangement direction;
each guide pile and two adjacent guide piles form an equilateral triangle, and the side length of the equilateral triangle is less than or equal to 3D, so that the pile group forms a water retaining structure;
the second step is to measure the flow rate;
when the water outlet flow passage needs to be cleaned at the gate sand, measuring the water flow speed at each guide pile of the piles arranged on the side of the main flow;
the third step is pile pulling, a guide pile at the position with the maximum flow velocity is pulled out by using a pile pulling device, a pile group forms a notch at the pile pulling position after the guide pile is pulled out, because the position is the position with the maximum flow velocity of the pile group, main flow water flows gush into a branch flow from the notch to form a water jet effect, a gully is punched on the gate sand, the gully is continuously enlarged and extends towards the branch flow direction under the continuous flushing of the water flows, and finally the main flow is communicated with the branch flow.
2. The method for governing the sediment in the dam of the reservoir based on the movable guide pile group, according to claim 1, is characterized in that: and if the intersection of the main flow and the branch flow is blocked by the gate sand again when the reservoir stores water again, piling in situ at the pile pulling position when the gate sand is treated last time, and then performing the second step and the third step again.
3. The method for governing the sediment in the dam of the reservoir based on the movable guide pile group as claimed in claim 1 or 2, wherein: when the intersection of the main flow and the branch flow does not need to treat the gate sand any more, all the guide piles are pulled out by using the pile pulling device, so that the guide piles are recycled.
4. The method for treating the sediment at the gate of the reservoir based on the movable guide pile group as claimed in claim 1 or 2, wherein: in the first step, jet flow piling is carried out, and a flow guide pile is a tubular pile;
when piling, a hydraulic hoisting crane is adopted to hoist the tubular pile, and the bottom of the tubular pile is provided with a nozzle with a water spraying direction vertically downward; the water inlet end of the high-pressure water pump is connected with a water source, the water outlet end of the high-pressure water pump is connected with a nozzle through a high-pressure hose, the high-pressure water pump is positioned on the ground or on a ship, and the high-pressure hose extends into the pipe pile from top to bottom and is connected with the nozzle; and starting the high-pressure water pump when the pile is driven, punching a pile hole on the gate sand or the riverbed below the tubular pile by utilizing water jet, and punching the tubular pile while driving the tubular pile until the tubular pile is driven to a preset depth, and closing the high-pressure water pump to finish the pile driving operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210466097.XA CN114790716B (en) | 2022-04-29 | 2022-04-29 | Reservoir barrage sand treatment method based on movable diversion pile group |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210466097.XA CN114790716B (en) | 2022-04-29 | 2022-04-29 | Reservoir barrage sand treatment method based on movable diversion pile group |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114790716A true CN114790716A (en) | 2022-07-26 |
| CN114790716B CN114790716B (en) | 2023-09-01 |
Family
ID=82461667
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210466097.XA Active CN114790716B (en) | 2022-04-29 | 2022-04-29 | Reservoir barrage sand treatment method based on movable diversion pile group |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114790716B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101824810A (en) * | 2010-04-08 | 2010-09-08 | 重庆交通大学 | Method for protecting river bank by sand-river pile group and flexible mattresses |
| JP2013002086A (en) * | 2011-06-14 | 2013-01-07 | Kenji Ishikura | Pile frame structure and structure of the same |
| CN104912027A (en) * | 2015-06-03 | 2015-09-16 | 四川大学 | Method for mitigating silt blockage of confluence of main stream and tributary of mountain river |
-
2022
- 2022-04-29 CN CN202210466097.XA patent/CN114790716B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101824810A (en) * | 2010-04-08 | 2010-09-08 | 重庆交通大学 | Method for protecting river bank by sand-river pile group and flexible mattresses |
| JP2013002086A (en) * | 2011-06-14 | 2013-01-07 | Kenji Ishikura | Pile frame structure and structure of the same |
| CN104912027A (en) * | 2015-06-03 | 2015-09-16 | 四川大学 | Method for mitigating silt blockage of confluence of main stream and tributary of mountain river |
Non-Patent Citations (3)
| Title |
|---|
| 耿明全 ， 张成 ， 张汝印: "黄河下游移动式导流坝研究与应用", 工程建设与管理, vol. 22, pages 42 - 45 * |
| 蒋思奇，张俊华，马怀宝，闫振峰: "利用支流蓄水冲刷拦门沙坎试验研究", 中国水运, vol. 15, no. 10, pages 213 - 218 * |
| 蒋思奇等: "小浪底水库畛水支流库容恢复试验研究", 人民黄河, vol. 43, pages 235 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114790716B (en) | 2023-09-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2008061415A1 (en) | A hydraulic sliding insertion panel and its using method | |
| JP5867918B2 (en) | A device that pumps and discharges deep water from a dam lake | |
| CN111305141B (en) | Drainage method for underground comprehensive pipe gallery in dry season canal penetrating | |
| CN103114553B (en) | Earth and rockfill dam piping burst field test method | |
| CN102767155A (en) | Reservoir dredging pipe system and layout method thereof | |
| CN114790716A (en) | Reservoir gate sand control method based on movable guide pile group | |
| CN207392285U (en) | A kind of grid type gas disturbs river mouth mud scum dredger | |
| CN111254910B (en) | Construction process for drainage pipe of tailing dam | |
| CN208604552U (en) | For the stake woods dam under complex geological condition | |
| CN111945654A (en) | Structure of predetermineeing of early processing of dammed lake | |
| CN106400807A (en) | Maritime work barge grouting method and device thereof | |
| CN215630060U (en) | Reusable precipitation well casing | |
| CN206752413U (en) | A kind of extra large work barge implement | |
| CN112031811B (en) | Cliff water injection plugging system and method | |
| US3858398A (en) | Method of and apparatus for making sand drains | |
| CN101122124A (en) | Steel sheet row pile embankment-protecting river-dredging method | |
| CN111305172A (en) | Diversion and drainage bidirectional pressure tunnel | |
| CN115045239B (en) | River reservoir tributary barrier sand natural ditch breaking system | |
| CN1176272C (en) | Method for lowering seepage line of body of dam by adopting osyris wightiana guide filtration | |
| CN206655180U (en) | A kind of piled estabilishing revetment structure suitable for lock approach | |
| CN206328759U (en) | Extra large work barge grouting equipment | |
| CN108677880A (en) | For the stake woods dam under complex geological condition | |
| CN104234037A (en) | Octagonal secant water-stop square pile for supporting | |
| CN219315637U (en) | River course bank protection retaining plate installation device | |
| CN115030114A (en) | Natural trench digging and breaking method for river reservoir tributary gate blocking sand |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |