CN110258457B - Dam structure for overhauling full hole section of diversion tunnel of hydroelectric engineering in canyon area - Google Patents
Dam structure for overhauling full hole section of diversion tunnel of hydroelectric engineering in canyon area Download PDFInfo
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- CN110258457B CN110258457B CN201910561948.7A CN201910561948A CN110258457B CN 110258457 B CN110258457 B CN 110258457B CN 201910561948 A CN201910561948 A CN 201910561948A CN 110258457 B CN110258457 B CN 110258457B
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- 238000010276 construction Methods 0.000 claims abstract description 68
- 239000004927 clay Substances 0.000 claims abstract description 65
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 50
- 238000000034 method Methods 0.000 claims abstract description 24
- 239000002893 slag Substances 0.000 claims abstract description 17
- 239000004575 stone Substances 0.000 claims abstract description 15
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 12
- 230000002265 prevention Effects 0.000 claims abstract description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 71
- 239000010959 steel Substances 0.000 claims description 71
- 238000012423 maintenance Methods 0.000 claims description 25
- 238000013461 design Methods 0.000 claims description 4
- 229940036057 clearcanal Drugs 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 4
- 230000000903 blocking effect Effects 0.000 abstract description 2
- 238000013459 approach Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
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- 230000002035 prolonged effect Effects 0.000 description 1
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- 239000011435 rock Substances 0.000 description 1
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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
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B7/00—Barrages or weirs; Layout, construction, methods of, or devices for, making same
- E02B7/02—Fixed barrages
- E02B7/04—Dams across valleys
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- Environmental & Geological Engineering (AREA)
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Abstract
The invention discloses a retaining dam structure for repairing a full hole section of a diversion tunnel of a hydro-electric engineering in a canyon area and a repairing method thereof, belongs to the field of hydraulic and hydro-electric engineering, and provides a retaining dam structure for repairing the full hole section of the diversion tunnel suitable for construction of the hydro-electric engineering in the canyon area and the repairing method thereof. The invention can adapt to the water retaining water level height in different periods in the construction process: firstly, a lower stone slag dam structure is formed, and the water retaining requirement in the construction period is met; by arranging the clay bag dam structure, the water blocking level requirement in the overhaul period is further improved, so that the overhaul of the full hole section of the diversion tunnel and the internal lock chamber is possible; and the clay bag dam structure can further adjust the water retaining elevation according to the actual upstream water, and is flexible and convenient and high in adaptability. The invention has the advantages of simple structure construction, low cost, safe and reliable structure and good seepage prevention effect.
Description
Technical Field
The invention relates to the field of water conservancy and hydropower engineering, in particular to a retaining dam structure for overhauling a full hole section of a diversion tunnel in a canyon area hydropower engineering and an overhauling method thereof.
Background
At present, large and medium-sized hydroelectric projects with multiple dams are being constructed and planned in southwest areas of China, such as 312m of double river mouths, 295m of two river mouths, such as 315m of America, she Batan m of America, 210m of Margaret and the like. As is well known, the large and medium-sized hydroelectric engineering is positioned in the mountain canyon, side slopes at two sides of the riverbed are steep, the riverway is narrow, and the construction diversion adopts a tunnel diversion scheme of digging corresponding diversion tunnels in mountain bodies, so that an upstream riverway is diverted to flow into a downstream riverway through the diversion tunnels.
The large and medium hydropower engineering diversion tunnel operation in the canyon area has the following characteristics: (1) the river valley is narrow, the elevation of the entrance of the diversion tunnel is low, and the arrangement space is very limited; (2) the engineering scale is large, the diversion tunnel has long running time, the running time can be as long as 6 years or longer, and the long-term running diversion tunnel is greatly risked to be scoured and damaged; (3) the guide hole inlet approach channel is usually low in height, and the front of the guide hole is basically blocked without storage capacity. In addition, the river bed load of the river basin in the southwest area is larger, more slag fields and living camps are arranged at the upstream of the diversion tunnel in the construction period, and slag falling along the river is likely to occur, so that the diversion tunnel is extremely easy to be eroded and destroyed, great potential safety hazards are brought to the engineering, and once the diversion tunnel has an accident, the loss to the engineering is extremely large. Therefore, if the full-hole section maintenance can be carried out on the diversion tunnel, the method has important significance for ensuring the safety of hydroelectric engineering construction, and the design and construction of the retaining dam structure for the full-hole section maintenance of the diversion tunnel becomes a key problem for the full-hole section maintenance of the diversion tunnel in order to ensure the dry land maintenance condition of the full-hole section of the diversion tunnel.
At present, under the condition that the diversion tunnel inlet is provided with arrangement conditions, a large number of earth-rock cofferdam retaining dams are used. However, the river channel in the water-electricity engineering construction area in the canyon area is narrow, the diversion tunnel inlet approach channel is designed short, the available arrangement space is very small, and if the traditional retaining dam structure is adopted, more problems exist: (1) the diversion tunnel inlets are arranged in a large space, so that the diversion tunnel inlets are difficult to arrange and even cannot be arranged (such as a double river mouth 1# diversion tunnel), the narrow river channel is serious, the water level of the river channel is correspondingly raised, and the construction difficulty is increased; (2) the construction of the traditional retaining dam structure needs to adopt seepage-proofing treatment measures with larger difficulty, so that the construction difficulty is increased, and the construction period is prolonged; (3) because the structural body type of the traditional retaining dam is larger, the later-stage dismantling difficulty of the retaining dam is also great, and the dismantling is incomplete.
In conclusion, the research on the retaining dam structure for overhauling the full hole section of the diversion tunnel, which is suitable for the hydro-electric engineering construction of the canyon area, has important significance.
Disclosure of Invention
The invention solves the technical problem of providing a retaining dam structure for overhauling the full hole section of a diversion tunnel, which is suitable for the construction of the hydro-electric engineering in the canyon area, and effectively overcomes the defects of large arrangement space, high seepage prevention construction difficulty, high dismantling difficulty and the like of the traditional retaining dam structure.
The technical scheme adopted for solving the technical problems is as follows: the dam structure for overhauling the full hole section of the diversion tunnel in the water-electricity engineering in the canyon area comprises a frame-type steel caisson structure, a clay bag dam structure, a gravel clay structure and a ballast dam structure; the frame type steel caisson structure is arranged in an open channel section of an inlet of the diversion tunnel, and clay bags are filled in the frame type steel caisson structure; the clay bag dam structure is positioned at the top of the frame-type steel caisson structure; the ballast dam structure is positioned at the upstream of the frame-type steel caisson structure; the gravel clay structure is filled between the ballast dam structure and the lattice steel caisson structure.
Further is: and laying a geomembrane layer on the water diversion surface of the frame type steel caisson structure to the top of the frame type steel caisson structure.
Further is: the top elevation of the gravel clay structure is the same as the top elevation of the ballast dam structure, and is H s And H is s ＝H 1 +0.5m; wherein H is 1 And taking the front design water level of the hole corresponding to the flood flow in five years in the construction time period corresponding to the construction period of the whole retaining dam structure.
Further is: the top elevation of the frame-type steel caisson structure is H k And meet H k ＝H 2 +0.5m; the top elevation of the clay bag dam structure is H n And meet H n ＝H 3 +0.5m; wherein: h 2 Taking a designed water level in front of a hole corresponding to flood flow in five years in the whole overhaul construction time period; h 3 Taking a designed water level in front of a hole corresponding to the flood flow in eight years in the whole overhaul construction time period, and H 1 <H 2 <H 3 。
Further is: the ratio of upstream slope to downstream slope of the ballast dam structure is set to be 1:1.5, and a hoisting platform of a frame-type steel caisson structure is arranged at the top of the ballast dam structure.
In addition, the invention also provides a method for overhauling the full hole section of the diversion tunnel of the hydro-power engineering in the canyon area, which adopts the dam structure for overhauling the full hole section of the diversion tunnel of the hydro-power engineering in the canyon area, and comprises the following steps:
A. the gate of the lower gate diversion tunnel is used for enabling river water to flow through the drainage channel in the overhaul period;
B. backfilling stone slag in front of a diversion tunnel to form a stone slag dam structure, and constructing a hoisting platform for forming a frame-type steel caisson structure on the top of the stone slag dam structure;
C. placing a crane on a hoisting platform at the top of the ballast dam structure, hoisting the frame-type steel caisson structure into an inlet clear channel section of a diversion tunnel by using the crane, and then throwing a clay bag into the frame-type steel caisson structure for filling; then piling up clay bags on the top of the frame-type steel caisson structure to form a clay bag dam-piling structure;
D. laying a geomembrane layer on the water diversion surface of the frame type steel caisson structure to the top of the frame type steel caisson structure, and then filling gravel clay between the ballast dam structure and the frame type steel caisson structure for seepage prevention treatment, so as to form a gravel clay structure;
E. b, constructing the steps A to D to form a retaining dam structure, and then opening a gate of the diversion tunnel to pump and drain water in the tunnel; then, carrying out maintenance operation on the full hole section of the diversion tunnel;
F. after the maintenance operation is finished, closing a gate of the diversion tunnel, and sequentially removing the clay bag dam structure, the frame type steel caisson structure, the gravel clay structure and the ballast dam structure.
Further is: in the step F, firstly removing the clay bag dam structure by using a crane, and then removing and recovering the frame-type steel caisson structure; and then removing the gravel clay structure and the ballast dam structure by adopting a long-arm backhoe excavator.
Further is: the overhaul construction of the diversion tunnel can be arranged in the withering period time period of one year before the diversion tunnel gate-off plugging construction.
The beneficial effects of the invention are as follows:
(1) the dam structure for overhauling the full hole section of the diversion tunnel in the canyon area hydropower engineering can adapt to water retaining water level heights in different periods in the construction process: firstly, the construction of the ballast dam is carried out in a relatively dry period of the dry period, the water level is relatively low in the period, a relatively low ballast dam structure is formed, and the water retaining requirement in the construction period is met. In addition, as the height of the ballast dam with a slower slope is lower, the space for structural arrangement is obviously saved, the whole retaining dam structure does not occupy the plane position of the inlets of the excessive diversion holes, the construction of the ballast dam structure is convenient, and meanwhile, the construction operation platform condition is provided for further hoisting the frame format steel caisson structure, so that the hoisting construction difficulty of the frame format steel caisson structure is greatly reduced.
(2) The top elevation of the formed frame type steel caisson structure is higher than the designed water level in front of a hole corresponding to flood flow in five years in the whole overhaul construction time period, the water retaining water level requirement of the overhaul period is met by arranging the clay bag dam structure and further increasing, so that overhaul of the diversion tunnel full-hole section and an internal lock chamber is possible, the water retaining assurance is high, the water retaining elevation can be adjusted by the clay bag dam structure according to actual upstream water supply, and the method is flexible and convenient, and high in adaptability.
(3) By paving a geomembrane layer on the drainage surface side of the frame-type steel caisson structure and building a gravel clay structure between the frame-type steel caisson structure and the ballast dam structure, the seepage prevention effect of the whole retaining dam structure is remarkably enhanced;
(4) according to the cofferdam structure dismantling method provided by the invention, the body type of each part is smaller, the dismantling difficulty is low, and the frame format steel caisson is easy to dismantle and recover.
In a word, the hydraulic diversion tunnel has the advantages of simple structure construction, low manufacturing cost, safe and reliable structure and good seepage prevention effect, realizes the blocking and interception of the hydraulic diversion tunnel in the canyon area, and provides maintenance operation conditions for the maintenance of the full tunnel section of the diversion tunnel and the internal lock chamber.
Drawings
FIG. 1 is a schematic diagram of a dam structure for maintenance of a full hole section of a diversion tunnel in a canyon area hydropower engineering according to the invention;
marked in the figure as: the soil-block type soil-block caisson comprises a frame-type steel caisson structure 1, a clay bag dam structure 2, a gravel clay structure 3, a ballast dam structure 4, an inlet clear channel section 5, a geomembrane layer 6 and a crane 7.
Detailed Description
The invention is further described below with reference to the drawings and the detailed description.
As shown in fig. 1, the retaining dam structure for overhauling the full hole section of the diversion tunnel in the canyon area hydropower engineering comprises a frame-type steel caisson structure 1, a clay bag dam structure 2, a gravel clay structure 3 and a ballast dam structure 4; the frame-type steel caisson structure 1 is arranged in an open channel section 5 of the diversion tunnel, and a clay bag is filled in the frame-type steel caisson structure 1; the clay bag dam structure 2 is positioned at the top of the frame-type steel caisson structure 1; the ballast dam structure 4 is positioned at the upstream of the frame-type steel caisson structure 1; the gravel clay structure 3 is filled between the ballast dam structure 4 and the lattice steel caisson structure 1.
More specifically, the invention can further lay a geomembrane layer 6 on the water diversion surface of the frame type steel caisson structure 1 to the top of the frame type steel caisson structure 1. Better anti-seepage effect can be achieved through the geomembrane layer 6. The laying of the geomembrane layer 6 is particularly shown with reference to the drawings, the upper end of which, after extending to the top of the lattice steel caisson structure 1, may further cover the top of the lattice steel caisson structure 1 completely.
More specifically, for the top elevation of each structure, the present invention is further configured according to the following dimensions:
the top elevation of the gravel clay structure 3 and the top elevation of the ballast dam structure 4 may be set to the same dimension H s And are all H s ＝H 1 +0.5m, where H 1 And taking the front design water level of the hole corresponding to the flood flow in five years in the construction time period corresponding to the construction period of the whole retaining dam structure. The advantages of this arrangement are: and the dry condition of the construction of the subsequent frame-type steel caisson structure 1 and the gravel clay structure 3 is effectively ensured. The construction time period corresponding to the construction period of the whole retaining dam structure refers to the construction time period corresponding to the construction period of the retaining dam structure for overhauling the full hole section of the diversion tunnel in the hydro-power engineering in the canyon area; in particular to maintenance of the full hole section of the diversion tunnel in the canyon area hydropower engineeringAnd (3) constructing time periods corresponding to the steps A to D in the method.
More specifically, in the invention, the top elevation of the frame-type steel caisson structure 1 is preferably H k And meet H k ＝H 2 +0.5m; the top elevation of the clay bag dam structure 2 is H n And meet H n ＝H 3 +0.5m; wherein: h 2 Taking a designed water level in front of a hole corresponding to flood flow in five years in the whole overhaul construction time period; h 3 And taking the designed water level in front of the hole corresponding to the flood flow in eight years in the whole overhaul construction time period. The advantages of this arrangement are: the dry condition in the diversion tunnel in the overhaul period is effectively ensured, so that the overhaul of the whole diversion tunnel is smoothly carried out, and the water retaining assurance is further improved by adding the clay bag dam structure 2. The whole maintenance construction period refers to a construction period corresponding to steps A to F in the method for maintaining the full hole section of the diversion tunnel in the hydro-power engineering in the canyon area.
More specifically, the requirements for the above elevation parameters are further satisfied in the present invention: h 1 <H 2 <H 3 The method comprises the steps of carrying out a first treatment on the surface of the The advantages of this arrangement are: the method can fully combine the front water level of the hole in the construction process of the retaining dam structure for overhauling the full hole section of the diversion tunnel of the water project in the canyon area, control the masonry top elevation of each structure, reduce the whole engineering quantity as much as possible, shorten the construction period and reduce the construction cost.
More specifically, in the invention, the upstream and downstream slope ratios of the ballast dam structure 4 are set to be 1:1.5, and the hoisting platform of the frame-type steel caisson structure 1 is arranged at the top of the ballast dam structure 4. Wherein the hoisting platform is used for placing a corresponding crane 7 so as to facilitate hoisting construction of the frame-type steel caisson structure 1 through the crane 7, thereby facilitating construction.
The clay bag stacking dam structure 2 in the present invention is a water retaining dam structure formed by stacking clay bags, and may have a trapezoid structure after stacking as shown in fig. 1. And because the clay bag dam structure 2 is formed by piling clay bags, the piling construction and the disassembly are relatively convenient, and the height of the clay bag dam structure 2 can be adjusted according to the water coming from the actual upstream in the actual construction process, so that the total water retaining height of the whole water retaining dam structure can be adjusted within a certain height range.
The invention also provides a method for overhauling the full hole section of the diversion tunnel of the hydro-power engineering in the canyon area, which comprises the following steps:
A. the gate of the lower gate diversion tunnel is used for enabling river water to flow through the drainage channel in the overhaul period;
B. backfilling stone slag in front of a diversion tunnel to form a stone slag dam structure 4, and constructing a hoisting platform of the frame-type steel caisson structure 1 on the top of the stone slag dam structure 4;
C. placing a crane 7 on a hoisting platform at the top of the ballast dam structure 4, hoisting the frame-type steel caisson structure 1 into an inlet clear canal section 5 of a diversion tunnel by using the crane 7, and then throwing a clay bag into the frame-type steel caisson structure 1 for filling; then piling up clay bags on the top of the frame-type steel caisson structure 1 to form a clay bag stacking dam structure 2;
D. laying a geomembrane layer 6 on the water diversion surface of the frame type steel caisson structure 1 to the top of the frame type steel caisson structure 1, and then filling gravel clay between the ballast dam structure 4 and the frame type steel caisson structure 1 for seepage prevention treatment, and forming a gravel clay structure 3;
E. b, constructing the steps A to D to form a retaining dam structure, and then opening a gate of the diversion tunnel to pump and drain water in the tunnel; then, carrying out maintenance operation on the full hole section of the diversion tunnel;
F. after the maintenance operation is finished, the gate of the diversion tunnel is closed, and the clay bag dam structure 2, the frame type steel caisson structure 1, the gravel clay structure 3 and the ballast dam structure 4 are removed.
In the construction method, after the gate of the diversion tunnel is opened, the overflow is needed to be carried out by means of the overhaul period drainage channel, so that the corresponding overhaul period drainage channel is needed to be built in a matched mode. In addition, after the shutoff diversion tunnel is completely plugged, during maintenance construction, upstream inflow water is required to be discharged through the maintenance period discharge channel, so that the discharge capacity of the corresponding maintenance period discharge channel is required to meet the discharge flow in the corresponding period. Specifically, in order to reduce the requirement on the drainage flow rate of the drainage channel in the maintenance period, the maintenance construction time period of the whole diversion tunnel is preferably arranged in the dead period time period of one year before the diversion tunnel gate plugging construction.
According to the overhaul method disclosed by the invention, after the gate of the diversion tunnel is closed, water flow is approximately in a still water condition before the diversion tunnel, so that the interception construction is facilitated. The first intercepting construction is to backfill the stone slag in front of the hole of the diversion tunnel to form the stone slag dam structure 4, the construction is more convenient, meanwhile, the formed stone slag dam structure 4 can also provide construction operation conditions for further hoisting the frame format steel caisson structure 1, namely, after the construction of the stone slag dam structure 4 is completed, a hoisting platform is formed at the top of the stone slag dam structure 4, then a crane 7 is placed on the hoisting platform, and after that, the crane 7 can be utilized for carrying out subsequent construction, such as the construction of the subsequent frame format steel caisson structure 1, the crane 7 can be adopted for carrying out hoisting construction, so that the construction is more convenient, and meanwhile, the construction efficiency can be effectively improved.
The dam structure for overhauling the full hole section of the diversion tunnel of the canyon area hydropower engineering can be constructed and formed through the steps A to D, and then a gate of the diversion tunnel can be opened to pump and drain water in the tunnel; and then overhauling the full hole section of the diversion tunnel. Wherein, the maintenance operation of the full hole section of the diversion tunnel generally comprises full-section maintenance of the body section of the diversion tunnel, and maintenance of a gate slot, a sill and the like in a lock chamber of the diversion tunnel.
After the maintenance operation of the full hole section of the diversion tunnel is completed, the clay bag dam structure 2, the frame type steel caisson structure 1, the gravel clay structure 3 and the ballast dam structure 4 can be removed; after the demolition is completed, the gate of the diversion tunnel can be restarted, so that the diversion tunnel can be restarted.
More specifically, the specific removal in step F may be performed in the following manner: firstly removing the clay bag dam structure 2 by using a crane 7, and then removing and recovering the frame grid type steel caisson structure 1; and then removing the gravel clay structure 3 and the ballast dam structure 4 by adopting a long-arm backhoe excavator. The long-arm backhoe is arranged on the shore, and the gravel clay structure 3 and the ballast dam structure 4 are removed by using the relatively long shovel arm so as to prevent corresponding ballast from entering the diversion tunnel.
Claims (4)
1. Dam structure is used in maintenance of full hole section of canyon district hydroelectric engineering diversion tunnel, its characterized in that: comprises a frame-type steel caisson structure (1), a clay bag dam structure (2), a gravel clay structure (3) and a ballast dam structure (4); the frame-type steel caisson structure (1) is arranged in an open channel section (5) of an inlet of the primary diversion tunnel and the middle diversion tunnel, and clay bags are filled in the frame-type steel caisson structure (1); the clay bag dam structure (2) is positioned at the top of the frame-type steel caisson structure (1); the ballast dam structure (4) is positioned at the upstream of the frame-type steel caisson structure (1); the gravel clay structure (3) is filled between the ballast dam structure (4) and the lattice steel caisson structure (1); laying a geomembrane layer (6) on the water diversion surface of the frame type steel caisson structure (1) to the top of the frame type steel caisson structure (1), wherein the top elevation of the gravel clay structure (3) is the same as the top elevation of the ballast dam structure (4), and the two elevations are H s And H is s =H 1 +0.5m; wherein H is 1 Taking a pre-hole design water level corresponding to flood flow in five years in a construction time period corresponding to the construction period of the whole retaining dam structure; the top elevation of the frame-type steel caisson structure (1) is H k And meet H k =H 2 +0.5m; the top elevation of the clay bag dam structure (2) is H n And meet H n = H 3 +0.5m; wherein: h 2 Taking a designed water level in front of a hole corresponding to flood flow in five years in the whole overhaul construction time period; h 3 Taking a designed water level in front of a hole corresponding to the flood flow in eight years in the whole overhaul construction time period, and H 1 < H 2 < H 3 The method comprises the steps of carrying out a first treatment on the surface of the The upstream and downstream slope ratios of the ballast dam structure (4) are respectively set to be 1:1.5, and a hoisting platform of the frame-type steel caisson structure (1) is arranged at the top of the ballast dam structure (4).
2. The method for overhauling the full hole section of the diversion tunnel of the hydro-power engineering in the canyon area adopts the dam structure for overhauling the full hole section of the diversion tunnel of the hydro-power engineering in the canyon area, which is characterized in that: the method comprises the following steps:
A. a gate of the diversion tunnel in the early and middle stages of the gate-down, and river water flows through a drainage channel in the overhaul period;
B. backfilling stone slag in front of a diversion tunnel in the early-middle stage to form a stone slag dam structure (4), and constructing a hoisting platform for forming a frame-type steel caisson structure (1) on the top of the stone slag dam structure (4);
C. placing a crane (7) on a hoisting platform at the top of the ballast dam structure (4), hoisting the frame-type steel caisson structure (1) into an inlet clear canal section (5) of a diversion tunnel in the early-middle stage by using the crane (7), and then throwing a clay bag into the frame-type steel caisson structure (1) for filling; then piling up clay bags on the top of the frame-type steel caisson structure (1) to form a clay bag stacking dam structure (2);
D. laying a geomembrane layer (6) on the water diversion surface of the frame-type steel caisson structure (1) to the top of the frame-type steel caisson structure (1), and then filling gravel clay between the ballast dam structure (4) and the frame-type steel caisson structure (1) for seepage prevention treatment, so as to form a gravel clay structure (3);
E. b, constructing the steps A to D to form a retaining dam structure, and then opening a gate of the diversion tunnel in the early and middle stages to pump and drain water in the tunnel; then, the maintenance operation of the full hole section of the diversion tunnel in the early and middle stages is carried out;
F. after the maintenance operation is finished, the gate of the primary and middle diversion tunnel is closed, and the clay bag dam structure (2), the frame type steel caisson structure (1), the gravel clay structure (3) and the ballast dam structure (4) are removed in sequence.
3. The method for overhauling the full hole section of the diversion tunnel in the hydro-power engineering in the canyon area as claimed in claim 2, wherein the method comprises the following steps: in the step F, firstly removing the clay bag dam structure (2) by using a crane (7), and then removing and recovering the frame-type steel caisson structure (1); and then removing the gravel clay structure (3) and the ballast dam structure (4) by adopting a long-arm backhoe excavator.
4. The method for overhauling the full hole section of the diversion tunnel in the hydro-power engineering in the canyon area as claimed in claim 2, wherein the method comprises the following steps: the overhauling construction of the primary and middle diversion tunnel is arranged in the withered period of one year before the gate plugging construction of the primary and middle diversion tunnel.
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| CN201910561948.7A CN110258457B (en) | 2019-06-26 | 2019-06-26 | Dam structure for overhauling full hole section of diversion tunnel of hydroelectric engineering in canyon area |
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