CN114960483B - Diversion tail water hole reconstruction plugging head upstream permanent drainage structure and drainage method - Google Patents
Diversion tail water hole reconstruction plugging head upstream permanent drainage structure and drainage method Download PDFInfo
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- CN114960483B CN114960483B CN202210432348.2A CN202210432348A CN114960483B CN 114960483 B CN114960483 B CN 114960483B CN 202210432348 A CN202210432348 A CN 202210432348A CN 114960483 B CN114960483 B CN 114960483B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 297
- 238000011144 upstream manufacturing Methods 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000005086 pumping Methods 0.000 claims abstract description 35
- 238000007689 inspection Methods 0.000 claims description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 238000012423 maintenance Methods 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 230000002159 abnormal effect Effects 0.000 claims description 7
- 229910001335 Galvanized steel Inorganic materials 0.000 claims description 4
- 239000008397 galvanized steel Substances 0.000 claims description 4
- 239000011435 rock Substances 0.000 claims description 4
- 239000002893 slag Substances 0.000 claims description 3
- 239000004746 geotextile Substances 0.000 claims description 2
- 230000005484 gravity Effects 0.000 claims description 2
- 238000010276 construction Methods 0.000 description 6
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 238000009933 burial Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F5/00—Draining the sub-base, i.e. subgrade or ground-work, e.g. embankment of roads or of the ballastway of railways or draining-off road surface or ballastway drainage by trenches, culverts, or conduits or other specially adapted means
- E01F5/005—Culverts ; Head-structures for culverts, or for drainage-conduit outlets in slopes
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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
- E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
- E02B3/10—Dams; Dykes; Sluice ways or other structures for dykes, dams, or the like
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B9/00—Water-power plants; Layout, construction or equipment, methods of, or apparatus for, making same
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B9/00—Water-power plants; Layout, construction or equipment, methods of, or apparatus for, making same
- E02B9/02—Water-ways
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B9/00—Water-power plants; Layout, construction or equipment, methods of, or apparatus for, making same
- E02B9/02—Water-ways
- E02B9/06—Pressure galleries or pressure conduits; Galleries specially adapted to house pressure conduits; Means specially adapted for use therewith, e.g. housings, valves, gates
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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
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- General Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Architecture (AREA)
- Environmental & Geological Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention provides a diversion tail water hole reconstruction plugging head upstream permanent drainage structure and a drainage method, wherein the structure comprises a plurality of diversion holes and diversion tail water holes respectively corresponding to the diversion holes, and the diversion tail water holes are connected with a tail water tunnel after arranging tail water reconstruction plugs; the diversion tunnel is provided with a water retaining wall at the downstream side of the diversion tunnel plug; two adjacent diversion holes are respectively provided with a self-flow drainage channel communicated with each other at the diversion hole plug position and the tail water reconstruction plug position, and two ends of the self-flow drainage channel at the diversion hole plug position are respectively communicated with diversion hole parts between the diversion hole plugs and the water retaining wall; one diversion tunnel is provided with a water collecting well at the upstream side of the tail water reconstruction plug; and permanent pumping equipment is arranged in the water collecting well and a water retaining wall of the diversion tunnel which is positioned in the same water collecting well. The invention has lower implementation cost, saves engineering investment, has good social benefit and economic benefit, and can be widely popularized and applied in the technical field of water conservancy and hydropower engineering.
Description
Technical Field
The invention belongs to the technical field of water conservancy and hydropower engineering, and particularly relates to a permanent drainage structure and a drainage method for reconstructing an upstream of a plugging head of a diversion tail water tunnel.
Background
In the existing hydraulic and hydroelectric engineering, in order to save engineering investment, a scheme of combining and arranging the diversion tunnel with the tail water tunnel needs to be researched during design of the diversion tunnel. The diversion tunnel is plugged after the diversion drainage task is completed, at present, the diversion tunnel plug mainly adopts a concrete structure and is mainly arranged at the impervious curtain position of the dam engineering, meanwhile, in order to ensure the safe and stable operation of the tail water tunnel at the later stage, the tail water reconstruction plug is required to be arranged at the upstream section of the junction part of the diversion tunnel and the tail water tunnel, and in general, the diversion tunnel plug is positioned at the upstream section of the tail water reconstruction plug.
According to the inspection requirements of the current dam in the operation period, the permanently plugged water retaining building needs to be inspected periodically, the implemented engineering of combining and arranging the diversion tail water holes is combined, under the current condition, a permanent drainage structure does not exist in a hole section between the diversion hole plugs and the tail water reconstruction plugs, the drainage of water in the hole section can not be realized under the condition that a self-flow drainage channel is not built, and if water seepage and water collection occur behind the diversion hole plugs, the inspection in the operation period is influenced, and meanwhile, the inspection is not convenient for the safety maintenance after the diversion hole plugs are in abnormal water retaining condition.
Therefore, there is a need to study a diversion tail water tunnel reconstruction plug head upstream permanent drainage structure and drainage method.
Disclosure of Invention
The first aim of the invention is to provide a diversion tail water tunnel reconstruction plugging head upstream permanent drainage structure aiming at the defects existing in the prior art.
For this purpose, the above object of the present invention is achieved by the following technical solutions:
the diversion tail water hole reconstruction plug head upstream permanent drainage structure comprises a plurality of diversion holes and diversion tail water holes corresponding to the diversion holes respectively, wherein the diversion tail water holes are connected with a tail water tunnel after tail water reconstruction plugs are arranged;
a diversion tunnel plug is arranged on the diversion tunnel, and a tail water reconstruction plug is arranged at the joint of the diversion tunnel and the diversion tail water tunnel;
the second half section of the diversion tunnel is combined with the tail water tunnel, the diversion tunnel is required to be plugged after the engineering is subjected to sluice water storage, and the plug is called as a diversion tunnel plug; the joint of the diversion tunnel and the tail water tunnel is required to be plugged so as to be beneficial to discharging tail water, and the plug is called a tail water reconstruction plug; the diversion tunnel plugs are positioned at the upstream side of the tail water reconstruction plug, and the structure causes the tunnel section between the two plugs not to have self-flowing drainage capacity;
the diversion tunnel is provided with a water retaining wall at the downstream side of the diversion tunnel plug;
two adjacent diversion holes are respectively provided with a self-flow drainage channel communicated with each other at the diversion hole plug position and the tail water reconstruction plug position, and two ends of the self-flow drainage channel at the diversion hole plug position are respectively communicated with diversion hole parts between the diversion hole plugs and the water retaining wall;
the diversion tunnel is provided with a water collecting well at the upstream side of the tail water reconstruction plug, and one end of the gravity drainage channel at the position of the tail water reconstruction plug is positioned in the water collecting well;
and permanent pumping equipment is arranged in the water collecting well and a water retaining wall of the diversion tunnel which is positioned in the same water collecting well.
The invention can also adopt or combine the following technical proposal when adopting the technical proposal:
as a preferable technical scheme of the invention: the drainage steel pipe is laid along the cavity by the diversion tail water hole reconstruction plug head upstream permanent drainage structure, and is communicated with permanent pumping equipment arranged in the water retaining wall and the water collecting well.
As a preferable technical scheme of the invention: and arranging a pre-buried sleeve on a water retaining wall of the permanent drainage device to arrange the permanent drainage device comprising a channel steel foundation, a water pump control box and a drainage pipeline.
As a preferable technical scheme of the invention: the water retaining walls are all of C20 concrete structures, and a row of phi 22 dowel bars with the interval of 1 m are distributed at the bottoms of the water retaining walls.
As a preferable technical scheme of the invention: the water collecting well adopts a C20 concrete structure, a phi 16 reinforcing steel bar net is arranged on the central axis of the wall body of the water collecting well, a row of phi 22 dowel bars with the interval of 1 m are required to be arranged at the bottom of the water collecting well, one end of each dowel bar is in rock, and the other end of each dowel bar is exposed and welded with the reinforcing steel bar net.
As a preferable technical scheme of the invention: phi 75 drain pipes with a distance of 0.5 m are embedded in the water collecting well from the bottom surface of 1.2 m.
As a preferable technical scheme of the invention: the port of the drain pipe positioned outside the water collecting well is provided with geotextile wrapping.
As a preferable technical scheme of the invention: proper slag padding and road hardening of the diversion tunnel bottom plate between the water retaining wall and the tail water reconstruction plug, and constructing water collecting and draining channels on two sides of the road, wherein the water collecting and draining channels flow from the diversion tunnel bottom plate to the tail water reconstruction plug and are arranged in the water collecting well on the upstream side of the tail water reconstruction plug, so that daily diversion tunnel bottom plate and water seepage around the tunnel automatically flow into the water collecting well.
As a preferable technical scheme of the invention: and a water measuring weir structure is built at the end point of the self-flow drainage channel and the drainage end point of the permanent pumping equipment, which are arranged between adjacent diversion tunnels, so that the water seepage condition of each catchment and drainage section can be monitored in real time, and the risk can be timely checked when the diversion tunnel plugs are abnormal in water retaining.
The second object of the present invention is to provide a drainage method for reconstructing a permanent drainage structure upstream of a plugging head based on the diversion tail water tunnel described above, aiming at the defects existing in the prior art.
For this purpose, the above object of the present invention is achieved by the following technical solutions:
the drainage method for reconstructing the permanent drainage structure at the upstream of the plugging head of the diversion tail water tunnel comprises the following steps:
(1) Building drainage holes of diversion tunnels: according to the actual engineering conditions, reconstructing the elevation of the bottom plate of each diversion tunnel plug and tail water to select one diversion tunnel from among a plurality of diversion tunnels as a main tunnel for water collection and permanent drainage equipment layout;
(2) Building a water retaining wall and a water collecting well: building a water retaining wall behind a diversion tunnel plug in the main diversion tunnel, building a water collecting well on the upstream side of a tail water reconstruction plug, and collecting water seepage at a tunnel section between the diversion tunnel plug and the tail water reconstruction plug;
(3) And (3) arranging permanent pumping equipment: arranging permanent pumping equipment in a signed water retaining wall and a water collecting well, wherein equipment selection is carried out by combining the water seepage condition in a hole section, or the water seepage estimation result in a combined hole is connected with pumping equipment to supply a manufacturer to form a matched selection, respectively arranging the starting points of the selected equipment in the water retaining wall and the water collecting well, laying galvanized steel pipes along a hole line (arranging along the hole wall and arranging a local crossing section by attaching a vault), and combining engineering to actually guide water catchments to an outward drainage catchment area (such as a drainage gallery or a drainage well) along an existing road;
(4) And (3) arranging and implementing a water measuring weir: in combination with engineering practice, a water measuring weir structure is required to be built at the end point of a self-flow drainage channel and the drainage end point of permanent pumping equipment which are arranged between adjacent diversion tunnels, so that the water seepage condition of each water collecting drainage section can be monitored in real time, and if the drainage condition of a diversion tunnel plug is abnormal, an abnormal area can be found more conveniently;
(5) And (3) regularly pumping and draining accumulated water in the hole: after the steps are implemented, after the water seepage and catchment in the hole section in the period to be operated are accumulated for a certain time, when the water level of the catchment area (inside the water retaining wall and inside the water collecting well) in the hole reaches a certain set water level, the pumping equipment is automatically started, accumulated water is pumped out, the water level is reduced to the set water level, the dry environment of the road surface passing through the hole section is ensured, and the maintenance and regular inspection are facilitated.
The invention provides a diversion tail water tunnel tail water reconstruction plugging head upstream permanent drainage structure and a drainage method, wherein the diversion tail water tunnel is a building with a diversion tunnel and a permanent flood discharge tunnel part combined, the diversion tunnel is required to be plugged in the engineering operation period, and the upstream section of the combined part of the diversion tunnel and the flood discharge tunnel is required to be plugged; the permanent drainage structure comprises a water retaining wall arranged behind the diversion tunnel plug and a water collecting well at the upstream side of the tail water reconstruction plug, wherein a drainage sleeve is embedded in the water retaining wall, and permanent drainage equipment is arranged near the water retaining wall and the water collecting well; the permanent drainage method comprises the following steps: (1) Water seepage at the rear of the diversion tunnel plug is blocked and collected by a water retaining wall; (2) The water collecting well at the upstream side of the tail water reconstruction plug head is responsible for collecting diversion tunnel bottom plates between diversion tunnel plugs and the tail water reconstruction plug head and water seepage around the diversion tunnel bottom plates; (3) Arranging permanent pumping equipment near a water collecting well at the rear of a diversion tunnel plug and at the upstream side of a tail water reconstruction plug, and pumping and draining water seepage of a plug section in the operation period to an engineering drainage area (such as a drainage gallery) by an automatic pumping and draining method to ensure that the plug section is dried; (4) In order to facilitate the study of the water seepage condition of the plug section in the operation period, a water measuring weir can be arranged in a permanently pumping drainage area to observe the water seepage in plugs in different periods in the operation period. The method is mainly aimed at the projects that the hydropower station diversion tunnel has larger size, more quantity (generally more than 1), deeper burial depth, combined arrangement with the flood discharge tunnel and difficult realization of self-flow drainage, and the method has simple and easy construction procedures, small changes to the original structure and convenient popularization and implementation; meanwhile, the water seepage drainage in the diversion tunnel plug and the tail water reconstruction plug can be well realized, and the dry inspection and the plug overhaul of the diversion tunnel plug in the later period are facilitated; the distribution of the water measuring weir in the water collecting and draining area can also realize real-time monitoring on the water seepage of the diversion tunnel plug, the water seepage of the bottom plate between the diversion tunnel plug and the tail water reconstruction plug and the water seepage around the tunnel, thereby providing a brand new solution for the subsequent safe and stable operation and maintenance of the engineering and providing references for other engineering of the same type.
Specifically, compared with the prior art, the invention has the following beneficial effects:
1) Under the current technical conditions, as most of diversion tunnels are deeper, the permanent drainage method of the operation period of the tunnel section between the diversion tunnel plug and the tail water reconstruction plug in the diversion tail water tunnel is basically free from systematic consideration and layout, and the permanent drainage structure and the drainage method in the tunnel section are specifically provided, so that the permanent drainage problem is solved, and the periodic inspection and the safety maintenance of the diversion tunnel plug in the operation period are greatly facilitated;
2) The invention has strong universality, and the permanent drainage method is suitable for permanent drainage of the hole section between the upper plug and the lower plug when most diversion tail water holes are combined and arranged. Through the arrangement of the permanent pumping equipment, when the water level of the catchment area (inside the water retaining wall and inside the water collecting well) in the hole reaches a certain set water level, the pumping equipment is automatically started to pump accumulated water, the water level is reduced to the set water level, the dry environment of the road surface passing through the hole section is ensured, and the maintenance and regular inspection are facilitated.
3) The arrangement of the automatic pumping equipment avoids the need of adopting a manual pumping method in the operation period under the original technical condition, improves the drainage efficiency, further reduces the labor cost and is beneficial to the management and maintenance of the hole section in the operation period.
4) The invention has simple construction process, lower implementation cost and less engineering investment, has good social benefit and economic benefit, and can be widely popularized and applied in the technical field of water conservancy and hydropower engineering.
Drawings
FIG. 1 is a plan view of a permanent drainage structure upstream of a diversion tail water tunnel reconstruction plug provided by the invention;
FIG. 2 is 1 # A plan layout diagram of a water retaining wall behind the diversion tunnel plug;
FIG. 3 is 2 # A plan layout diagram of a water retaining wall behind the diversion tunnel plug;
FIG. 4 is a typical cross-sectional view of a water wall;
FIG. 5 is 1 # Reconstructing a plan layout diagram of the water collecting well at the upstream of the blocking head by using tail water of the diversion tunnel;
FIG. 6 is a typical cross-sectional view of a water collection well;
in the figure: 1-diversion tunnel (for the convenience of follow-up brief description, the one where the pumping equipment is arranged is called 1# diversion tunnel, the other is called 2# diversion tunnel), 2-tail water tunnel (section not combined with diversion tunnel), 3-diversion tail water tunnel (section combined with diversion tunnel), 4-1 # Diversion tunnel plug, 5-2 # Diversion tunnel plug, 6-phi 200 drain hole, 7-galvanized steel pipe (permanent drain steel pipe layout line), 8-1 # Water-retaining wall, 9-2 # Water-retaining wall, 10-1 # ~2 # The system comprises a diversion tunnel traffic hole (diversion tunnel blocking construction period traffic hole), an 11-water collecting well, a 12-tail water reconstruction plug, a 13-pre-buried DN150 sleeve, a 14-channel steel foundation, a 15-water pump control box, a 16-water pumping and draining pipeline, 17-C20 concrete, 18-phi 22 dowel bars, a 19-phi 16 reinforcing steel bar net, a 20-pre-buried phi 75 drain pipe and 21-geotechnical cloth.
Detailed Description
The invention will be described in further detail with reference to the drawings and specific embodiments.
Referring to fig. 1, the present invention provides a diversion tail water tunnel reconstruction plug head upstream permanent drainage structure and a drainage method, which mainly solves the problem of drainage in the operation period of the upstream section of a junction section (namely, a diversion tail water tunnel 3) of a diversion tunnel 1 and a tail water tunnel 2, mainly in the diversion tunnel plug 8/9 and a tail water reconstruction plug 12.
Firstly, two diversion tunnels exist as shown in the figure, and a diversion tunnel traffic tunnel 10 needs to be built after the engineering is subjected to gate water storage so as to facilitate the diversion tunnel blocking construction. Is required to be 1 # Diversion tunnel plugs 4 and 2 # Respectively arranging 1 at the position 3-5 m behind the diversion tunnel plug 5 # Retaining walls 8 and 2 # And a water retaining wall 9, and a phi 200 water drain hole 6 is punched between two diversion tunnel plugs. 1 # The water collecting well 11 is built on the upstream of the diversion tunnel tail water reconstruction plug 12, and two tail water reconstruction plugs 12 are shown in the figure, and a phi 200 water drain hole 6 is formed on the upstream side of the tail water reconstruction plug 12 in a punching mode. In addition, water collecting drainage ditches (not shown in the figure) which are constructed on the two sides of the bottom surface of the cavity in the two diversion tunnels and flow from the diversion tunnel plugs to the tail water reconstruction plugs on the upstream side of the plugs are mainly used for collecting water seepage on the bottom plate of the diversion tunnel and the periphery of the cavity. The catchment in the diversion tunnel can be automatically collected into a diversion tunnel through the drain holes, the catchment area is mainly positioned in a water retaining wall behind the diversion tunnel plugs in the diversion tunnel and in a water collecting well at the upstream side of the tail water reconstruction plug, the water retaining wall mainly collects diversion tunnel plug seepage, and the water collecting well mainly collects diversion tunnel bottom plates and water seepage around the diversion tunnel from the downstream of the water retaining wall to the tail water reconstruction plug.
Through the arrangement, 1 # 、2 # Catchment in the diversion tunnel plug and the tail water reconstruction plug in the diversion tunnel are respectively collected to 1 # The water collecting well 11 on the upstream side of the diversion tunnel plug and the tail water reconstruction plug is arranged in the water retaining wall 8 behind the diversion tunnel plug, then a galvanized steel pipe 7 is erected along the grotto route by adopting permanent pumping equipment to guide the catchment drainage to the downstream river channel (the drainage and guide route is required to be combined with engineering to be practically guided to an outer drainage catchment area such as a drainage gallery or a drainage well along the original passing road, and the implementation is supported by construction due to different engineering implementation routesThe holes direct water into the plunge pool drain gallery, not shown in detail).
Referring to fig. 2, DN150 sleeve 13 is pre-buried in water-retaining wall 8, and permanent pumping and draining equipment is arranged therein, including channel steel foundation 14, water pump control box 15, pumping and draining pipeline 16, etc. (water pump and other equipment such as pressure gauge, gate valve, controller, connector, etc. are not shown in detail, and may be provided by supply manufacturer).
Referring to fig. 3 and 4,1 # Retaining walls 8 and 2 # The water retaining wall 9 has a height of 1.6 m and adopts a C20 concrete 17 structure, a row of phi 22 dowel bars 18 with a spacing of 1 m are arranged at the bottom, the dowel bars have a length of 1 m, the rock is put into 0.5 m, and 0.5 m is exposed.
Referring to fig. 5, DN150 sleeves 13 are pre-embedded in the side walls of the water collection well 11, and permanent pumping and draining equipment is arranged therein, including a channel steel foundation 14, a water pump control box 15, a pumping and draining pipeline 16 and the like (water pumps and other matched equipment such as pressure gauges, gate valves, controllers, connectors and the like are not shown in detail and can be provided by a supply manufacturer in a matched manner).
Referring to fig. 6, the water collecting well 11 is 3-m in height, adopts a C20 concrete 17 structure, and is provided with a phi 16 reinforcing steel bar net 19 at the central axis of the wall body; a row of phi 22 dowel bars 18 with a spacing of 1 m are arranged at the bottom, the dowel bar length is 1 m, the rock is 0.5 m, the exposed space is 0.5 m, and the dowel bars are welded with the reinforcing mesh 19; the phi 75 drain pipe 20 with the interval of 0.5 m is pre-buried at the distance of 1.2 m from the ground, and the pipe orifice at the outer side of the water collecting well is wrapped by geotechnical cloth 21; the phi 75 drain pipe 20 tends to have a slope of 5% in the sump.
In addition to the above description, the drawings should not be shown in detail: the water weir structures are constructed at the end points of the self-flow drainage channels and the drainage end points of the permanent pumping equipment, which are actually arranged between the adjacent diversion tunnels, in combination with engineering, so that the water seepage condition of each catchment drainage section can be monitored in real time; in the figure, proper slag filling and road hardening of the bottom plate are carried out between the diversion tunnel plug and the tail water reconstruction plug, so that the inspection of later period inspection is facilitated, meanwhile, a water collecting and draining channel from the diversion tunnel plug to the water collecting well at the upstream side of the tail water reconstruction plug is required to be built on two sides of the road, and the water collecting and draining channel is used for automatically flowing water from the bottom plate of the daily diversion tunnel and the periphery of the diversion tunnel into the water collecting well.
Finally, when the engineering enters the operation period, the water seepage and water collection in the hole section between the diversion hole plug and the tail water reconstruction plug are accumulated and finally collected into the water retaining wall and the water collecting well, when the water level in the water retaining wall and the water collecting well reaches a certain set water level, the pumping equipment is automatically started, accumulated water is pumped out, the water level is reduced to the set water level, the dry environment of the road surface passing through the hole section is ensured, and the follow-up maintenance and regular inspection are facilitated.
In summary, the diversion tail water hole reconstruction blocking head upstream permanent drainage structure and the drainage method thereof can systematically solve the problem of the upstream permanent drainage of the diversion tail water hole in the operation period, greatly facilitate the regular inspection and the safe maintenance of the diversion hole plugs in the operation period, and simultaneously, the technical scheme has simple construction process, lower implementation cost and good social benefit and economic benefit; meanwhile, compared with the traditional manual drainage scheme, the drainage efficiency of the hole section in the operation period can be improved, the labor cost is further reduced, and management and maintenance are facilitated. In general, the invention has strong universality and can be widely popularized and applied in the technical field of hydraulic and hydroelectric engineering.
Claims (8)
1. The utility model provides a water conservancy diversion tail water hole rebuilds stifled first upper reaches permanent drainage structures which characterized in that: the diversion tail water hole reconstruction plug head upstream permanent drainage structure comprises a plurality of diversion holes and diversion tail water holes corresponding to the diversion holes respectively, wherein the diversion tail water holes are connected with the tail water tunnel after the diversion tail water holes are provided with tail water reconstruction plugs;
a diversion tunnel plug is arranged on the diversion tunnel, and a tail water reconstruction plug is arranged at the joint of the diversion tunnel and the diversion tail water tunnel;
the diversion tunnel is provided with a water retaining wall at the downstream side of the diversion tunnel plug;
two adjacent diversion holes are respectively provided with a self-flow drainage channel communicated with each other at the diversion hole plug position and the tail water reconstruction plug position, and two ends of the self-flow drainage channel at the diversion hole plug position are respectively communicated with diversion hole parts between the diversion hole plugs and the water retaining wall;
the diversion tunnel is provided with a water collecting well at the upstream side of the tail water reconstruction plug, and one end of the gravity drainage channel at the position of the tail water reconstruction plug is positioned in the water collecting well;
permanent pumping equipment is arranged in the water collecting well and a water retaining wall of the diversion tunnel which is positioned in the same water collecting well;
the drainage steel pipe is laid along the cavity by the permanent drainage structure at the upstream of the diversion tail water hole reconstruction plugging head and is communicated with the permanent drainage equipment arranged in the water retaining wall and the water collecting well;
and arranging a pre-buried sleeve on a water retaining wall of the permanent drainage device to arrange the permanent drainage device comprising a channel steel foundation, a water pump control box and a drainage pipeline.
2. The diversion tail water tunnel reconstruction plug upstream permanent drainage structure according to claim 1, wherein: and a row of phi 22 dowel bars with the interval of 1 m are distributed at the bottom of the water retaining wall.
3. The diversion tail water tunnel reconstruction plug upstream permanent drainage structure according to claim 1, wherein: the wall body of the water collecting well is provided with a phi 16 steel bar net at the central axis, the bottom of the water collecting well is provided with a row of phi 22 dowel bars with the interval of 1 m, one end of each dowel bar is put into rock, and the other end of each dowel bar is exposed and welded with the steel bar net.
4. The diversion tail water tunnel reconstruction plug upstream permanent drainage structure according to claim 1, wherein: phi 75 drain pipes with a distance of 0.5 m are embedded in the water collecting well from the bottom surface of 1.2 m.
5. The diversion tail water tunnel reconstruction plug upstream permanent drainage structure according to claim 4, wherein: the port of the drain pipe positioned outside the water collecting well is provided with geotextile wrapping.
6. The diversion tail water tunnel reconstruction plug upstream permanent drainage structure according to claim 1, wherein: proper slag padding and road hardening of the diversion tunnel bottom plate between the water retaining wall and the tail water reconstruction plug, and constructing water collecting and draining channels on two sides of the road, wherein the water collecting and draining channels flow from the diversion tunnel bottom plate to the tail water reconstruction plug and are arranged in the water collecting well on the upstream side of the tail water reconstruction plug, so that daily diversion tunnel bottom plate and water seepage around the tunnel automatically flow into the water collecting well.
7. The diversion tail water tunnel reconstruction plug upstream permanent drainage structure according to claim 1, wherein: and a water measuring weir structure is built at the end point of the self-flow drainage channel and the drainage end point of the permanent pumping equipment, which are arranged between adjacent diversion tunnels, so that the water seepage condition of each catchment and drainage section can be monitored in real time, and the risk can be timely checked when the diversion tunnel plugs are abnormal in water retaining.
8. The drainage method for reconstructing a permanent drainage structure at the upstream of a plugging head based on the diversion tail water tunnel as claimed in claim 1, which is characterized by comprising the following steps: the drainage method comprises the following steps:
(1) Building drainage holes of diversion tunnels: according to the actual engineering conditions, reconstructing the elevation of the bottom plate of each diversion tunnel plug and tail water to select one diversion tunnel from among a plurality of diversion tunnels as a main tunnel for water collection and permanent drainage equipment layout;
(2) Building a water retaining wall and a water collecting well: building a water retaining wall behind a diversion tunnel plug in the main diversion tunnel, building a water collecting well on the upstream side of a tail water reconstruction plug, and collecting water seepage at a tunnel section between the diversion tunnel plug and the tail water reconstruction plug;
(3) And (3) arranging permanent pumping equipment: arranging permanent pumping equipment in the water retaining wall and the water collecting well, wherein the equipment selection is carried out by combining the water seepage condition in the hole section, or combining the water seepage estimation result in the hole to connect pumping equipment to supply the matched selection of manufacturers, respectively arranging the starting points of the selected equipment in the water retaining wall and the water collecting well, laying galvanized steel pipes along the hole line, and combining engineering to actually guide catchments to an outward drainage catchment area along the existing road;
(4) And (3) arranging and implementing a water measuring weir: in combination with engineering practice, a water measuring weir structure is required to be built at the end point of a self-flow drainage channel and the drainage end point of permanent pumping equipment which are arranged between adjacent diversion tunnels, so that the water seepage condition of each water collecting drainage section can be monitored in real time, and if the drainage condition of a diversion tunnel plug is abnormal, an abnormal area can be found more conveniently;
(5) And (3) regularly pumping and draining accumulated water in the hole: after the steps are implemented, after the water seepage and catchment in the hole section in the period to be operated are accumulated for a certain time, when the water level of the catchment area in the hole reaches a certain set water level, the pumping equipment is automatically started to pump accumulated water, the water level is reduced to the set water level, the dry environment of the road surface passing through the hole section is ensured, and the maintenance and regular inspection are facilitated.
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