CN107313785B - Lining structure of blocking section of ecological water supply hole of high dam - Google Patents
Lining structure of blocking section of ecological water supply hole of high dam Download PDFInfo
- Publication number
- CN107313785B CN107313785B CN201710731369.3A CN201710731369A CN107313785B CN 107313785 B CN107313785 B CN 107313785B CN 201710731369 A CN201710731369 A CN 201710731369A CN 107313785 B CN107313785 B CN 107313785B
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- lining
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- water supply
- straight hole
- concrete
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/08—Lining with building materials with preformed concrete slabs
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Abstract
The invention discloses a high dam ecological water supply hole plugging section lining structure in the field of hydraulic and hydroelectric engineering, which comprises an upper straight hole section lining, a lower block lining and a lower straight hole section lining which are sequentially arranged from the upstream to the downstream of a water supply hole, wherein the bottom of the lower block lining is provided with a downward sunken stone slag area, and the surface of the stone slag area is provided with a concrete plate. The beneficial effects of the invention are as follows: the side wall and the top arch of the traditional wedge-shaped body lining structure are expanded and excavated to be only expanded and excavated to the bottom, the construction difficulty is greatly reduced, the stone slag area and the fiber concrete slab are arranged, the overflow condition of the bottom plate in the reservoir water storage period is met, the difficulty of concrete crushing and stone slag cleaning during later plugging is reduced, the defect that the leakage capacity is reduced due to sudden expansion and sudden shrinkage of the traditional lining structure is avoided, the construction quality of the plugging structure is improved, and the defect that the construction difficulty of the upper layer concrete of the traditional wedge-shaped body plug structure is high, and the gap is formed after the concrete is contracted so as to leak water is effectively overcome.
Description
Technical Field
The invention relates to the field of water conservancy and hydropower engineering, in particular to a lining structure of a blocking section of an ecological water supply hole of a high dam and a blocking method thereof.
Background
The construction of the high dam is carried out in the deep mountain canyon area, the cofferdam is cut off all the year round, the construction diversion mode of draining through diversion tunnel is most applied, and after the large diversion tunnels are used, the large diversion tunnels are plugged by adopting a concrete permanent plug structure, and water storage power generation can be carried out in the later stage. However, the elevation difference between the diversion tunnel and other drainage buildings in the high dam engineering is large, and according to the water resource demonstration standard requirements of the water conservancy division, the requirement that the downstream water supply is not less than a certain ecological flow during initial water storage is met, and the ecological water supply tunnel is required to be arranged to be connected with the water supply so as to ensure that the downstream river is not cut off. After the downstream water supply function is finished, the water storage requirement of the reservoir is met by plugging, so that the lining structure type of the plugging section of the ecological water supply hole has great significance for plugging construction, engineering safety and power generation benefit of a power station.
At present, the most used wedge-shaped body structure in the plugging section lining of the water and electricity high dam engineering tunnel has better structural stability, but the structure has the following defects:the sudden expansion and the sudden contraction of the lining structure can reduce the leakage flow rate coefficient of the tunnel, so that the leakage capacity is reduced, and the flow state is poor; />The construction difficulty of the upper layer concrete of the plug structure is high, the compactness of the concrete is difficult to ensure, and gaps are easy to appear after shrinkage so as to leak water; />The grouting arrangement difficulty in the later construction period is high, and the grouting effect is poor.
Disclosure of Invention
In order to overcome the defects of the lining of the plugging section of the tunnel of the existing high dam engineering, the invention aims to solve the technical problems that: the lining structure of the blocking section of the ecological water supply hole of the high dam and the blocking method thereof are stable in drainage, simple in construction and convenient for subsequent blocking.
The technical scheme adopted for solving the technical problems is as follows:
the utility model provides an ecological water supply hole shutoff section lining structure of high dam, includes last straight hole section lining, lower block lining and the straight hole section lining that sets gradually down from the water supply hole upper reaches, the bottom of lower block lining is equipped with the stone sediment district of undercut, the surface in stone sediment district is equipped with concrete slab.
Further, the concrete slab is a fiber concrete slab, the thickness of the fiber concrete slab is the same as that of the lining of the upper straight hole section, and the water diversion surface is smoothly connected with the water diversion surfaces of the lining of the upper straight hole section and the lining of the lower straight hole section and is positioned on the same horizontal plane.
Furthermore, at least one layer of annular water stop sheet is required to be arranged between the concrete slab and the lower block lining contacted with the concrete slab.
Further, the starting point of the lower block lining is located 1-2 m behind a dam curtain line, the lining is carried out on the lower block lining immediately after the upper straight hole section, the length of the stone slag area is 8-18 m, and the deepest depth of the lower block lining is 1.5-2.5 m.
Further, the ballast area of the lower block lining is sequentially provided with a lower expansion section lining with gradually increased depth, a straight hole section lining and a shrinkage section lining with gradually reduced depth from the upstream to the downstream of the water supply hole, and the lengths of the lower expansion section lining are equal to or less than the straight hole section lining and less than the shrinkage section lining.
Further, the lining of the upper straight hole section is positioned on a curtain line of the dam, the length is controlled to be 5-10 m, and the section type and the section size are kept unchanged.
Further, the lining of the lower straight hole section is identical to the lining of the upper straight hole section in section type and size, and the length is controlled to be 4-9 m.
The blocking method for the lining structure of the blocking section of the ecological water supply hole of the high dam comprises the following steps:
A. performing gate opening on the ecological water supply hole gate;
B. performing the preparation work construction of pouring plugs such as an ecological water supply hole outlet cofferdam, a hole entering road and the like;
C. crushing the concrete slab, and removing the ballast in the ballast area after the crushing;
D. pouring a first layer of concrete for plugging the plug, wherein the thickness of the layer is 0.5-1.5 m more than the embedding depth;
E. and after the first layer of concrete is constructed, carrying out a subsequent concrete pouring construction procedure, and finally forming a lower embedded type blocking plug structure to meet the reservoir water storage condition.
The beneficial effects of the invention are as follows:
1. the structure of the upper straight hole section lining, the lower embedded lining and the lower straight hole section lining is adopted, the expansion and excavation of the side wall and the top arch of the traditional wedge-shaped body lining structure is changed into the expansion and excavation of the bottom, and the construction difficulty is greatly reduced;
2. the arrangement of the stone slag area and the fiber concrete slab not only meets the condition of overflow of the bottom plate in the water storage period of the reservoir, but also reduces the difficulty of concrete crushing and stone slag cleaning in the later plugging period, and simultaneously avoids the defect that the overflow capacity is reduced due to sudden expansion and sudden contraction of the traditional lining structure;
3. the structure of the plugging plug of the hole section is embedded, so that the safety and stability of the plug under the condition of high water content are greatly improved, meanwhile, the size of a top arch type is kept unchanged, the pouring and later grouting of the plug are more convenient, the construction quality of the plugging structure is improved, and the defect that the construction difficulty of the upper layer concrete of the wedge-shaped plug structure is high and water leakage occurs due to gaps after shrinkage of the concrete is effectively overcome.
Drawings
FIG. 1 is a schematic illustration of the lining structure of a plugging section according to the present invention.
FIG. 2 is a schematic view of the structure of the plugging segment wedge body of the present invention.
The figures are marked as 1-upper straight hole section lining, 2-lower block lining, 3-lower straight hole section lining, 4-ballast zone, 5-concrete slab, 6-water stop, 7-dam curtain line, 41-lower expansion section lining, 42-straight hole section lining, 43-shrinkage section lining, 8-plug structure, 81-first layer concrete structure, 82-subsequent concrete structure.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1, the high dam ecological water supply hole plugging section lining structure comprises an upper straight hole section lining 1, a lower block lining 2 and a lower straight hole section lining 3 which are sequentially arranged from the upstream to the downstream of a water supply hole, wherein the bottom of the lower block lining 2 is provided with a downward sunken stone slag area 4, and the surface of the stone slag area 4 is provided with a concrete slab 5. The conventional water supply hole plugging section is generally of a wedge structure which is required to expand and dig the side wall and the top arch of the hole body and is of a wedge structure which gradually reduces from upstream to downstream. The lining structure only needs to carry out certain expansion digging on the bottom of the tunnel body, and the pattern sizes of the side wall and the vault are kept unchanged, so that the construction difficulty is greatly reduced.
The concrete slab 5 is a fiber concrete slab, the thickness of the fiber concrete slab is the same as that of the upper straight hole section lining 1, and the drainage surface is smoothly connected with the drainage surfaces of the upper straight hole section lining 1 and the lower straight hole section lining 3 and is positioned on the same horizontal plane. The adoption of the fiber concrete slab can improve the scouring resistance of the water supply hole lining, the drainage surface of the fiber concrete slab is smoothly connected with the drainage surfaces of the upper straight hole section lining 1 and the lower straight hole section lining 3, and the drop impact of water flow caused by fluctuation can be reduced, so that a certain protection effect is achieved on the lining.
Furthermore, at least one layer of annular water stop sheet 6 is required to be arranged between the concrete slab 5 and the lower block lining 2 contacted with the concrete slab. The water stop sheet 6 has the function of avoiding adverse effects of water flow brushing and the like caused by water flow entering the stone slag area 4 so as to prolong the service life of the lining.
The starting point of the lower block lining 2 is positioned 1-2 m behind the dam curtain line 7, the lower block lining is directly connected with the upper straight hole section lining 1, the length of the stone slag area 4 is 8-18 m, and the deepest embedding depth is 1.5-2.5 m. The starting point of the lower block lining 2 is arranged behind the dam curtain line 7 for 1-2 m, so that the influence of a rock mass water system on the structure can be reduced, and the whole lower block lining 2 is more stable in structure. The length and depth of the ballast zone 4 are designed mainly according to the size and geological conditions of the water supply hole, so that the subsequent plugs can be ensured to be completely stable and play a role in plugging.
In order to construct the stone slag zone 4 with the bottom of the lower block lining 2 recessed downwards more normally, the stone slag zone 4 of the lower block lining 2 is sequentially divided into a lower expansion section lining 41 with gradually increased depth, a straight hole section lining 42 and a shrinkage section lining 43 with gradually reduced depth from the upstream to the downstream of a water supply hole, and the length relationship among the lower expansion section lining 41 is that the straight hole section lining 42 is less than or equal to the shrinkage section lining 43, and the lower expansion section lining 41 is arranged according to the structure, so that the construction and the plugging effect of a subsequent plug are facilitated.
The upper straight hole section lining 1 is positioned on a dam curtain line 7, the length is controlled to be 5-10 m, and the section type and the section size are kept unchanged. The section types and the dimensions of the lower straight hole section lining 3 and the upper straight hole section lining 1 are the same, and the length is controlled to be 4-9 m. The upper straight hole section lining 1 and the lower straight hole section lining 3 mainly play roles in drainage and plugging transition, the section types and the section sizes of the upper straight hole section lining 1 and the lower straight hole section lining 3 are the same and are kept unchanged, and the defect that the drainage capacity is reduced due to sudden expansion and sudden shrinkage of the traditional lining structure can be avoided.
The method for plugging the lining structure of the plugging section of the ecological water supply hole of the high dam comprises the following steps:
A. performing gate opening on the ecological water supply hole gate;
B. performing the preparation work construction of pouring plugs such as an ecological water supply hole outlet cofferdam, a hole entering road and the like;
C. crushing the concrete slab, and removing the ballast in the ballast area after the crushing;
D. pouring a first layer of concrete for plugging the plug, wherein the thickness of the layer is 0.5-1.5 m more than the embedding depth;
E. and after the first layer of concrete is constructed, carrying out a subsequent concrete pouring construction procedure, and finally forming a lower embedded type blocking plug structure to meet the reservoir water storage condition.
As shown in fig. 2, the whole plug structure 8 is divided into a first layer of concrete structure 81 and a subsequent concrete structure 82, the first layer of concrete structure 81 is filled in the stone slag area 4 of the original lower block lining 2, and forms a stable clamping structure with the lower block lining 2, so that the safety and stability of the plug under the condition of high external water are greatly improved, meanwhile, the size of the top arch type is kept unchanged, the construction of the subsequent concrete structure 82 is obviously more convenient, the construction quality of the plug structure 8 is improved, and the defect that the construction difficulty of the upper layer of concrete of the wedge-shaped plug structure is large, and gaps appear after shrinkage of the concrete to leak water in the past is effectively overcome.
Compared with the traditional wedge-shaped body structure, the embedded lining structure is simpler in structure and more convenient to construct, ensures convenience of subsequent plug construction and stability of plugging while ensuring ecological water supply and drainage capacity, and has good practicability and application prospect.
Claims (6)
1. High dam ecology water supply hole shutoff section lining structure, characterized by: the water supply tunnel comprises an upper straight hole section lining (1), a lower block lining (2) and a lower straight hole section lining (3) which are sequentially arranged from the upstream to the downstream of the water supply tunnel, wherein the bottom of the lower block lining (2) is provided with a downward sunken stone slag area (4), and the surface of the stone slag area (4) is provided with a concrete slab (5); the concrete slab (5) is a fiber concrete slab, the thickness of the concrete slab (5) is the same as that of the upper straight hole section lining (1), the drainage surface is smoothly connected with the drainage surfaces of the upper straight hole section lining (1) and the lower straight hole section lining (3) and is positioned on the same horizontal plane, and at least one layer of annular water stop sheet (6) is required to be arranged between the concrete slab (5) and the lower block lining (2) which is contacted with the concrete slab.
2. The lining structure of the blocking section of the ecological water supply tunnel of the high dam according to claim 1, which is characterized in that: the starting point of the lower block lining (2) is positioned 1-2 m behind a dam curtain line (7), the straight hole section lining (1) is arranged next, the length of the stone slag area (4) is 8-18 m, and the deepest depth of the lower block lining is 1.5-2.5 m.
3. The lining structure of the blocking section of the ecological water supply tunnel of the high dam according to claim 2, which is characterized in that: the stone slag area (4) of the lower block lining (2) is sequentially provided with a lower expansion section lining (41), a straight hole section lining (42) and a shrinkage section lining (43) with gradually reduced depth from the upstream to the downstream of the water supply hole, wherein the lengths of the lower expansion section lining (41) are less than or equal to the length of the straight hole section lining (42) and less than the length of the shrinkage section lining (43).
4. The lining structure of the blocking section of the ecological water supply tunnel of the high dam according to any one of claims 1 to 3, which is characterized in that: the upper straight hole section lining (1) is positioned on a dam curtain line (7), the length is controlled to be 5-10 m, and the section type and the section size are kept unchanged.
5. The lining structure of the blocking section of the ecological water supply tunnel of the high dam according to claim 4, which is characterized in that: the section types and the dimensions of the lower straight hole section lining (3) and the section types and the dimensions of the upper straight hole section lining (1) are the same, and the length is controlled to be 4-9 m.
6. The blocking method of the lining structure of the blocking section of the ecological water supply hole of the high dam according to any one of claims 1 to 5, comprising the following steps:
A. performing gate opening on the ecological water supply hole gate;
B. performing the preparation work construction of pouring plugs such as an ecological water supply hole outlet cofferdam, a hole entering road and the like;
C. crushing the concrete slab, and removing the ballast in the ballast area after the crushing;
D. pouring a first layer of concrete for plugging the plug, wherein the thickness of the layer is 0.5-1.5 m more than the embedding depth;
E. and after the first layer of concrete is constructed, carrying out a subsequent concrete pouring construction procedure, and finally forming a lower embedded type blocking plug structure to meet the reservoir water storage condition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710731369.3A CN107313785B (en) | 2017-08-23 | 2017-08-23 | Lining structure of blocking section of ecological water supply hole of high dam |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710731369.3A CN107313785B (en) | 2017-08-23 | 2017-08-23 | Lining structure of blocking section of ecological water supply hole of high dam |
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| CN107313785A CN107313785A (en) | 2017-11-03 |
| CN107313785B true CN107313785B (en) | 2023-08-22 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107724351A (en) * | 2017-11-14 | 2018-02-23 | 长江勘测规划设计研究有限责任公司 | A kind of diversion tunnel vertical cyclindrical shape stopper structure pattern and method |
| CN108547642A (en) * | 2018-06-15 | 2018-09-18 | 中国电建集团成都勘测设计研究院有限公司 | Diversion Tunnel excavation liner structure |
| CN108952810A (en) * | 2018-08-06 | 2018-12-07 | 中国电建集团华东勘测设计研究院有限公司 | A kind of tunnel blocks stopper structure construction method and tunnel and tunnel blocks plug |
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