CN112879090A - Anti-seismic anti-blocking separation drainage structure for tunnel decontamination - Google Patents
Anti-seismic anti-blocking separation drainage structure for tunnel decontamination Download PDFInfo
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- CN112879090A CN112879090A CN202110134027.XA CN202110134027A CN112879090A CN 112879090 A CN112879090 A CN 112879090A CN 202110134027 A CN202110134027 A CN 202110134027A CN 112879090 A CN112879090 A CN 112879090A
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- drainage structure
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- 238000000926 separation method Methods 0.000 title claims abstract description 28
- 238000005202 decontamination Methods 0.000 title claims abstract description 13
- 230000003588 decontaminative effect Effects 0.000 title claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 81
- 238000009825 accumulation Methods 0.000 claims abstract description 15
- 239000002689 soil Substances 0.000 claims abstract description 15
- 239000004744 fabric Substances 0.000 claims abstract description 13
- 239000011150 reinforced concrete Substances 0.000 claims abstract description 9
- 230000005540 biological transmission Effects 0.000 claims description 45
- 230000008595 infiltration Effects 0.000 claims description 13
- 238000001764 infiltration Methods 0.000 claims description 13
- 238000001914 filtration Methods 0.000 claims description 8
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 239000010865 sewage Substances 0.000 abstract description 5
- 230000000903 blocking effect Effects 0.000 abstract description 4
- 230000002265 prevention Effects 0.000 description 6
- 230000035939 shock Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F16/00—Drainage
- E21F16/02—Drainage of tunnels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/62—Regenerating the filter material in the filter
- B01D29/64—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element
- B01D29/6469—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element scrapers
- B01D29/6484—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element scrapers with a translatory movement with respect to the filtering element
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
- E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
- E21D11/383—Waterproofing; Heat insulating; Soundproofing; Electric insulating by applying waterproof flexible sheets; Means for fixing the sheets to the tunnel or cavity wall
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B13/00—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B3/00—Machines or engines of reaction type; Parts or details peculiar thereto
- F03B3/12—Blades; Blade-carrying rotors
-
- 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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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Architecture (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Civil Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Sewage (AREA)
Abstract
The invention discloses an anti-seismic and anti-blocking separation drainage structure for tunnel decontamination, which comprises a top water seepage tank and a filter frame, wherein the inner surface of the top water seepage tank is provided with the outer surface of a soil cloth layer, the inner surface of the soil cloth layer is provided with the outer surface of a waterproof layer, the inner surface of the waterproof layer is provided with the outer surface of a reinforced concrete layer, one end of the bottom of the top water seepage tank is arranged at one end of a water pipe, the other end of the water pipe penetrates through one side of the water accumulation tank, the other end of the bottom of the top water seepage tank penetrates through the top end of the water accumulation tank, the water accumulation tank is arranged inside the ground, the filter frame penetrates through the ground and extends into the water accumulation tank, the inner surface of the filter frame is provided with the upper end of an anti-blocking mechanism, and the surface. The separation drainage structure can be convenient for prevent from blocking, is convenient for utilize sewage productivity, is convenient for reduce resource consumption, and ensures that the separation drainage structure can prevent from blocking and reduce resource consumption.
Description
Technical Field
The invention relates to the technical field of separation drainage structures, in particular to an anti-seismic and anti-blocking separation drainage structure for tunnel decontamination.
Background
Separation drainage structure is a drainage mechanism who effectively separates impurity and sewage, and it is often used for the drainage in places such as tunnel, road and garage, can be effectively quick with ponding discharge, avoids causing the unnecessary loss.
But present separation drainage structures can not be convenient for prevent to block up, and the sewage productivity of not being convenient for utilize reduces the resource consumption not for separation drainage structure not only blocks up easily and causes a large amount of ponding, and the energy of utilizing sewage output of not being convenient for moreover reduces the consumption of resource, leads to it to be difficult to satisfy the market demand.
The existing urgent need is to improve the function of the separation drainage structure, improve the service efficiency of the separation drainage structure, make it exert the maximum value, both conveniently prevent the jam, can improve the utilization ratio again, can be better reflect the value of the separation drainage structure, have guaranteed the convenient use of the separation drainage structure.
Disclosure of Invention
The invention aims to provide an anti-seismic and anti-blocking separation drainage structure for tunnel decontamination, which aims to solve the problem that the existing separation drainage structure in the background art cannot prevent blockage and reduce resource consumption.
In order to achieve the purpose, the invention provides the following technical scheme: a separation drainage structure for tunnel decontamination with shock resistance and blockage prevention comprises a top water seepage tank and a filter frame, wherein the inner surface of the top water seepage tank is provided with the outer surface of a soil cloth layer, the inner surface of the soil cloth layer is provided with the outer surface of a waterproof layer, the inner surface of the waterproof layer is provided with the outer surface of a reinforced concrete layer, one end of the bottom of the top water seepage tank is arranged at one end of a water pipe, the other end of the water pipe penetrates through one side of the water seepage tank, the other end of the bottom of the top water seepage tank penetrates through the top end of the water accumulation tank, the water accumulation tank is arranged inside the ground, the filter frame penetrates through the ground and extends into the water accumulation tank, the inner surface of the filter frame is provided with the upper end of a blockage prevention mechanism, the surface of the blockage prevention mechanism extends out of the bottom of the water accumulation tank through the bottom of the filter frame, and the bottom of ponding groove stretches into the inside of kerve, the internal surface of kerve one side is connected with one side of drive mechanism through the second axostylus axostyle, and drive mechanism's opposite side is provided with the one end of first axostylus axostyle, and the other end of first axostylus axostyle is connected with the internal surface of kerve opposite side through hydroelectric generator, the surface of first axostylus axostyle is provided with the lower extreme of fixed block, and the upper end of fixed block is provided with the blade, the lower extreme of kerve runs through and is provided with the delivery port.
Preferably, the top infiltration tank, the soil cloth layer, the waterproof layer and the reinforced concrete soil layer are arranged by penetrating through the upper surface of the ground at two ends.
Preferably, the shape of the top water seepage groove is isosceles trapezoid, and a water seepage port is arranged on the wider top surface of the top water seepage groove in a penetrating mode.
Preferably, the arrangement of the water pipe is horizontally inclined by 15 degrees, and the inner surface of the water pipe is arranged to be a flat and smooth surface.
Preferably, prevent that stifled mechanism contains foraminiferous plug, connecting block and carriage release lever, and the side of foraminiferous plug sets up in the internal surface of filtering the frame, the bottom surface of foraminiferous plug is provided with the upper end of connecting block, and the lower extreme of connecting block runs through the upper end that is provided with the carriage release lever, the bottom of stretching out to the ponding groove in the bottom of filter frame is passed through to the surface of carriage release lever, and the upper portion of lower extreme through the kerve of carriage release lever runs through the top that stretches into drive mechanism.
Preferably, drive mechanism contains shell, transmission shaft and transmission piece, and transmission shaft and transmission piece all set up in the inside of shell, the upper end setting of transmission piece one side is run through at the both ends of transmission shaft, and the surface of transmission shaft runs through the lower extreme that is provided with the carriage release lever, and the lower extreme of carriage release lever sets up between 2 transmission pieces, 2 the lower extreme of transmission piece opposite side is connected with first axostylus axostyle and second axostylus axostyle respectively.
Compared with the prior art, the invention has the beneficial effects that: the separation drainage structure can be convenient for prevent from blocking, is convenient for utilize sewage productivity, is convenient for reduce resource consumption, and ensures that the separation drainage structure can prevent from blocking and reduce resource consumption.
Drawings
FIG. 1 is a schematic cross-sectional view of the present invention;
FIG. 2 is a schematic side view of the present invention;
FIG. 3 is a schematic cross-sectional view of the present invention 1 and 4;
FIG. 4 is a partial cross-sectional structural schematic of the present invention;
FIG. 5 is a schematic structural view of the anti-blocking mechanism of the present invention;
fig. 6 is a schematic structural diagram of the transmission mechanism of the present invention.
In the figure: 1. a top water seepage tank; 2. a soil cloth layer; 3. a waterproof layer; 4. a reinforced concrete layer; 5. a water pipe; 6. a filter frame; 7. an anti-blocking mechanism; 701. a rubber plug with a hole; 702. connecting blocks; 703. a travel bar; 8. a transmission mechanism; 801. a housing; 802. a drive shaft; 803. a transmission block; 9. a blade; 10. a fixed block; 11. a first shaft lever; 12. a water outlet; 13. a hydroelectric generator; 14. a bottom groove; 15. a water accumulation tank; 16. a second shaft lever; 17. and (4) the ground.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-6, the present invention provides a technical solution: a separation drainage structure for tunnel decontamination with shock resistance and blockage prevention comprises a top water seepage tank 1, a soil cloth layer 2, a waterproof layer 3, a reinforced concrete layer 4, a water pipe 5, a filter frame 6, a blockage prevention mechanism 7, a perforated rubber plug 701, a connecting block 702, a moving rod 703, a transmission mechanism 8, a shell 801, a transmission shaft 802, a transmission block 803, a blade 9, a fixed block 10, a first shaft rod 11, a water outlet 12, a hydroelectric generator 13, a bottom tank 14, a water accumulation tank 15, a second shaft rod 16 and a ground 17, wherein the inner surface of the top water seepage tank 1 is provided with the outer surface of the soil cloth layer 2, the inner surface of the soil cloth layer 2 is provided with the outer surface of the waterproof layer 3, the inner surface of the waterproof layer 3 is provided with the outer surface of the reinforced concrete layer 4, one end of the bottom of the top water seepage tank 1 is arranged at one end of the water pipe 5, the other end of the water pipe 5 penetrates one, the water accumulating tank 15 is arranged inside the ground 17, the filtering frame 6 penetrates through the ground 17 and extends into the water accumulating tank 15, the inner surface of the filtering frame 6 is provided with the upper end of an anti-blocking mechanism 7, the surface of the anti-blocking mechanism 7 extends out to the bottom of the water accumulating tank 15 through the bottom end of the filtering frame 6, the lower end of the anti-blocking mechanism 7 penetrates through the upper part of the bottom tank 14 and extends into the top end of the transmission mechanism 8, the bottom of the water accumulating tank 15 extends into the bottom tank 14, the inner surface of one side of the bottom tank 14 is connected with one side of the transmission mechanism 8 through a second shaft lever 16, the other side of the transmission mechanism 8 is provided with one end of a first shaft lever 11, the other end of the first shaft lever 11 is connected with the inner surface of the other side of the bottom tank 14 through a hydraulic generator 13, the surface of the first shaft lever 11 is provided with the lower end of a fixed block 10, the upper, and the bottom groove 14 and the water outlet 12 are both arranged inside the ground 17.
Both ends of top infiltration groove 1, soil cloth layer 2, waterproof layer 3 and reinforced concrete soil layer 4 all run through the upper surface setting on ground 17, and the both ends of top infiltration groove 1 run through the inside that stretches into ponding groove 15 and water pipe 5 through ground 17, and the bottom of ponding groove 15 runs through there is concentrated outlet, can be convenient for four lower extremes all fix on ground 17.
The shape of top infiltration groove 1 sets up to isosceles trapezoid, and the top surface of 1 broad of top infiltration groove is run through and is provided with the infiltration mouth, can be convenient for collect water and drainage.
The water pipe 5 is horizontally inclined for 15 degrees, the inner surface of the water pipe 5 is a flat and smooth surface, and water can be conveniently and intensively collected in the water collecting tank 15.
Prevent that stifled mechanism 7 contains foraminiferous plug 701, connecting block 702 and carriage release lever 703, and the side of foraminiferous plug 701 sets up in the internal surface of filtering frame 6, the bottom surface of foraminiferous plug 701 is provided with the upper end of connecting block 702, and the lower extreme of connecting block 702 runs through the upper end that is provided with carriage release lever 703, the bottom of crossing filtering frame 6 is stretched out to the bottom of ponding groove 15 in the surface of carriage release lever 703, and the upper portion that the lower extreme of carriage release lever 703 passes through kerve 14 runs through the top of stretching into drive mechanism 8, can be convenient for accomplish drainage and decontamination through the structure of preventing stifled mechanism 7.
The working principle is as follows: leading to earlier with the inside of water from top infiltration groove 1 and 5 flow direction ponding grooves 15 of water pipe, make water pass through the concentrated outlet discharge impact of ponding groove 15 bottom on blade 9, it rotates to drive first axostylus axostyle 11 through the rotation of blade 9, make the transmission block 803 that first axostylus axostyle 11 one end is connected rotate, drive the carriage release lever 703 through the transmission shaft 802 between 2 transmission blocks 803 and remove, make carriage release lever 703 drive foraminiferous plug 701 through connecting block 702 and reciprocate, make the jam that blocks up on moving foraminiferous plug 701 surface extruded, the completion prevents to block up, when separation drainage structures prevents to block up, accessible following mode operation:
according to fig. 1 and 5, water is firstly flowed from the top seeping tank 1 and the water pipe 5 to the interior of the water collecting tank 15, so that the water is discharged through a centralized water outlet at the bottom of the water collecting tank 15 and impacts on the blades 9;
the blades 9 rotate to drive the first shaft rod 11 to rotate, so that the transmission blocks 803 connected to one end of the first shaft rod 11 rotate, and the moving rod 703 is driven to move by the transmission shafts 802 between 2 transmission blocks 803;
finally, the moving rod 703 drives the rubber plug 701 with the hole to move up and down through the connecting block 702, so that the garbage blocked on the surface of the rubber plug 701 with the hole is extruded out, and the blockage prevention is finished;
when the resource consumption is reduced by the separation drainage structure, the adjustment mode is as follows:
according to the figures 1 and 2, water flows from the top water seepage tank 1 and the water pipe 5 to the interior of the water accumulating tank 15, so that the water is discharged through the centralized water outlet at the bottom of the water accumulating tank 15 and impacts on the blades 9, the blades 9 rotate to drive the first shaft rod 11 to rotate, and the hydraulic generator 13 connected to the other end of the first shaft rod 11 works to store electric quantity, so that the electric quantity can be supplied to electric facilities in the tunnel.
It is to be understood that the terms "central," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for the purpose of convenience and simplicity of description, and do not indicate or imply that the referenced devices or components must be in a particular orientation, constructed and operated in a particular orientation, and are not to be considered limiting of the scope of the present invention.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The utility model provides a tunnel of antidetonation preventing blockking up is decontaminated and is used separation drainage structures, includes top infiltration groove (1) and filter frame (6), its characterized in that: the inner surface of the top infiltration tank (1) is provided with the outer surface of a soil cloth layer (2), the inner surface of the soil cloth layer (2) is provided with the outer surface of a waterproof layer (3), the inner surface of the waterproof layer (3) is provided with the outer surface of a reinforced concrete layer (4), one end of the bottom of the top infiltration tank (1) is arranged at one end of a water pipe (5), the other end of the water pipe (5) penetrates through one side of a water accumulation tank (15), the other end of the bottom of the top infiltration tank (1) penetrates through the top end of the water accumulation tank (15), the water accumulation tank (15) is arranged inside the ground (17), the filter frame (6) penetrates through the ground (17) and extends into the inside of the water accumulation tank (15), the inner surface of the filter frame (6) is provided with the upper end of an anti-blocking mechanism (7), the surface of the anti-blocking mechanism (7) extends out of the bottom of the water accumulation tank (15) through the bottom end, the lower end of the anti-blocking mechanism (7) penetrates through the upper portion of the bottom groove (14) and extends into the top end of the transmission mechanism (8), the bottom of the water collecting groove (15) extends into the bottom groove (14), the inner surface of one side of the bottom groove (14) is connected with one side of the transmission mechanism (8) through the second shaft lever (16), the other side of the transmission mechanism (8) is provided with one end of the first shaft lever (11), the other end of the first shaft lever (11) is connected with the inner surface of the other side of the bottom groove (14) through the hydraulic generator (13), the surface of the first shaft lever (11) is provided with the lower end of the fixing block (10), the upper end of the fixing block (10) is provided with the blade (9), the lower end of the bottom groove (14) penetrates through the water outlet (12), and the bottom groove (14) and the water outlet (12) are both arranged inside the ground (17).
2. The anti-seismic and anti-clogging separation drainage structure for tunnel decontamination according to claim 1, characterized in that: the both ends of top infiltration groove (1), soil cloth layer (2), waterproof layer (3) and reinforced concrete dirt bed (4) all run through the upper surface setting on ground (17), and the both ends of top infiltration groove (1) run through ground (17) and stretch into the inside of ponding groove (15) and water pipe (5), and the bottom of ponding groove (15) runs through there is the concentrated outlet.
3. The anti-seismic and anti-clogging separation drainage structure for tunnel decontamination according to claim 1, characterized in that: the shape of the top water seepage tank (1) is isosceles trapezoid, and a water seepage port is arranged on the wider top surface of the top water seepage tank (1) in a penetrating mode.
4. The anti-seismic and anti-clogging separation drainage structure for tunnel decontamination according to claim 1, characterized in that: the arrangement of the water pipe (5) is horizontally inclined by 15 degrees, and the inner surface of the water pipe (5) is a flat and smooth surface.
5. The anti-seismic and anti-clogging separation drainage structure for tunnel decontamination according to claim 1, characterized in that: prevent stifled mechanism (7) and contain foraminiferous plug (701), connecting block (702) and carriage release lever (703), and the side of foraminiferous plug (701) sets up in the internal surface of filtering frame (6), the bottom surface of foraminiferous plug (701) is provided with the upper end of connecting block (702), and the lower extreme of connecting block (702) runs through the upper end that is provided with carriage release lever (703), the bottom of stretching out to ponding groove (15) through the bottom of filtering frame (6) in the surface of carriage release lever (703), and the upper portion that the lower extreme of carriage release lever (703) passes through kerve (14) runs through the top that stretches into drive mechanism (8).
6. The anti-seismic and anti-clogging separation drainage structure for tunnel decontamination according to claim 1, characterized in that: drive mechanism (8) contain shell (801), transmission shaft (802) and transmission piece (803), and transmission shaft (802) and transmission piece (803) all set up in the inside of shell (801), the upper end setting of transmission piece (803) one side is run through at the both ends of transmission shaft (802), and the surface of transmission shaft (802) runs through the lower extreme that is provided with carriage release lever (703), and the lower extreme of carriage release lever (703) sets up between 2 transmission pieces (803), 2 the lower extreme of transmission piece (803) opposite side is connected with first axostylus axostyle (11) and second axostylus axostyle (16) respectively.
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| CN202110134027.XA CN112879090B (en) | 2021-02-01 | 2021-02-01 | Anti-seismic anti-blocking separation drainage structure for tunnel decontamination |
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| CN202110134027.XA CN112879090B (en) | 2021-02-01 | 2021-02-01 | Anti-seismic anti-blocking separation drainage structure for tunnel decontamination |
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