CN110499740A - The safe method for blocking of diversion tunnel under a kind of hydroelectric project high water head unfavorable geological condition - Google Patents
The safe method for blocking of diversion tunnel under a kind of hydroelectric project high water head unfavorable geological condition Download PDFInfo
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- CN110499740A CN110499740A CN201910707131.6A CN201910707131A CN110499740A CN 110499740 A CN110499740 A CN 110499740A CN 201910707131 A CN201910707131 A CN 201910707131A CN 110499740 A CN110499740 A CN 110499740A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 84
- 238000000034 method Methods 0.000 title claims abstract description 29
- 230000000903 blocking effect Effects 0.000 title claims abstract description 21
- 238000010276 construction Methods 0.000 claims abstract description 47
- 239000011435 rock Substances 0.000 claims abstract description 46
- 238000007596 consolidation process Methods 0.000 claims abstract description 10
- 230000008569 process Effects 0.000 claims abstract description 8
- 238000011144 upstream manufacturing Methods 0.000 claims description 27
- 238000007789 sealing Methods 0.000 claims description 26
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- 238000003973 irrigation Methods 0.000 claims description 9
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- 238000010008 shearing Methods 0.000 claims description 6
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
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- 238000011010 flushing procedure Methods 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 4
- 239000008267 milk Substances 0.000 claims description 4
- 210000004080 milk Anatomy 0.000 claims description 4
- 235000013336 milk Nutrition 0.000 claims description 4
- 239000004570 mortar (masonry) Substances 0.000 claims description 4
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- 230000008901 benefit Effects 0.000 description 2
- 230000015271 coagulation Effects 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 230000008676 import Effects 0.000 description 2
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- 238000000465 moulding Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/16—Sealings or joints
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- Civil Engineering (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
It the invention discloses the safe method for blocking of diversion tunnel under a kind of hydroelectric project high water head unfavorable geological condition, including lower lock, draws water and blocks, wherein blocking includes the construction of security protection plug, bad geological section surrounding rock consolidation construction and permanent plug construction.The method of the present invention is directed to diversion tunnel under hydroelectric project high water head unfavorable geological condition and blocks feature; it takes security protection plug and bad geological section country rock is reinforced; the risk of unstability under effectively avoiding bad geological section country rock high water head from acting on by twice guarantee; it greatly improves lock under diversion tunnel and blocks safety guarantee rate; security protection plug can also stop unexpected water burst in hole, protection plugging construction operating personnel safety when inlet of diversion tunnel gate destroys simultaneously.The present invention implements strong operability, security protection bulkhead concrete pour with bad geological section consolidation grouting simple process, plugging effect is good, short construction period, and construction cost is low, has good application value.
Description
Technical field
The invention belongs to Hydraulic Structure Engineering technical field of construction, and in particular to a kind of hydroelectric project high water head unfavorable geology
Under the conditions of the safe method for blocking of diversion tunnel.
Background technique
Diversion tunnel is hydroelectric project after upstream and downstream builds cofferdam water retaining, the river water for water conservancy diversion and shunting hot work in progress
Stream, to guarantee dam engineering in dry work, diversion tunnel belongs to temporay building, builds in hydroelectric project water diverting structure and flood discharge
After the completion of building object, function will be lost, need to be blocked, diversion tunnel closure indicates that hydroelectric project starts water storage, is that reservoir stores
Can the crucial control condition of water and the important milestone event of construction of hydropower plant, diversion tunnel closure smoothly be completed in time,
Playing benefit on schedule to entire engineering has extremely important effect, in practice it has proved that, repeatedly there is water conservancy diversion in domestic and international hydroelectric project
Hole blocks failure accident, causes heavy economic losses, causes great public safety dangerous situation and great public sentiment, therefore, diversion tunnel
Closure must accomplish ten thousand different mistakes.
The position that diversion tunnel blocks plug need to be located on hydroelectric project seepage proof curtain position, and impervious body is formed in conjunction with curtain
A part of system, so that entire water retaining structure seepage prevention system becomes an entirety, otherwise, regardless of blocking plug in seepage proof curtain
After preceding or seepage proof curtain, it is likely to so that diversion tunnel and its country rock become penetrating passage, therefore, antiseepage curtain in Practical Project
There is typically further a distances with upstream inlet of diversion tunnel for curtain, and after diversion tunnel blocks, reservoir level rapid increase, this section of distance is led
High water head effect will be born by flowing hole country rock, and since diversion tunnel is temporay building, geological conditions is often compared to main body permanent works
Want poor, unstability risk will be present in this section of diversion tunnel country rock under high water head, this will determine that diversion tunnel blocks success or failure, in addition, if forever
Upstream inlet gate destroys during long plugging construction, and unexpected water burst also will generate huge peace to plug construction personnel in hole
Full blast danger, therefore the safe method for blocking of diversion tunnel under a kind of hydroelectric project high water head unfavorable geological condition need to be studied.
Summary of the invention
The purpose of the present invention is to overcome the shortcomings of the existing technology, provides a kind of for hydroelectric project high water head unfavorable geology
Under the conditions of diversion tunnel safe method for blocking.
The purpose of the present invention is achieved through the following technical solutions: being led under a kind of hydroelectric project high water head unfavorable geological condition
Flow the safe method for blocking in hole, comprising the following steps:
S1. descend lock: port strobe carries out lower lock to inlet of diversion tunnel gate and out；
S2. draw water: after lower lock, the draining that installation suction pump is respectively called on the inside of inlet of diversion tunnel gate and out port strobe is floating
Ship draws water simultaneously, and water in diversion tunnel is drained；
S3. it blocks: including the construction of security protection plug, bad geological section surrounding rock consolidation construction and permanent plug construction；
Wherein, the security protection plug construction is to repair between bad geological section upstream and inlet of diversion tunnel in diversion tunnel
Security protection plug is built, security protection plug size section is consistent with the diversion tunnel cross-section of river, and computational length；Security protection is stifled
Head keeps out upstream high water level, to protect bad geological section country rock and permanent plug to construct.
The bad geological section surrounding rock consolidation construction is to be consolidated by diversion tunnel drainage hole to bad geological section country rock
Consolidation by grouting improves Surrounding Rock Strength；
The permanent plug construction blocks permanent to build permanent plug at diversion tunnel seepage proof curtain as diversion tunnel
Water retaining structure, permanent plug size section is consistent with diversion tunnel section, and computational length；
Wherein, the security protection plug and permanent plug length are calculated according to Shear Strength formula:
L-plug length in formula；K-safety coefficient；P-design head gross thrust；The friction system of f-concrete and country rock
Number；A-cross-sectional area；γ-concrete density；The Shear cohesiveness of C-concrete and country rock contact surface；λ-removes crown
Outside, the effective area coefficient of plug bottom surface, side and country rock contact surface, it is main to consider that joint grouting is ineffective and concrete is received
Contracting etc. influences, and bottom surface takes λ=1, and side λ value determines as the case may be, and security protection plug only considers plug bottom surface when calculating
It is contacted with country rock, considers that plug bottom surface, side are contacted with country rock simultaneously when permanent plug calculates；S-is in addition to crown, plug bottom
Face, side and country rock or concrete contact section perimeter.
Further, to inlet of diversion tunnel and gone out in step S1 using opening and closing hoisting system, door machine or automobile crawler crane
Port strobe carries out lower lock.Gate slot dredging is carried out before lower lock, guarantees that gate can smoothly descend lock, and diver can be used and cooperate mud
Pump, high-pressure air hose are cleared up.
Further, security protection plug described in step S3 uses C20 normal concrete placement layer by layer, with rapid construction
It completes to be principle, be not required to consider Concrete temperature controlling and carry out grouting treatment, allow to have certain sliding deformation and infiltration.
Further, the permanent plug construction include tooth excavation, lining concrete surface dabbing, concreting,
Water flowing is cooling and is in the milk, specifically: multiple tracks shearing resistance tooth socket is set in permanent plug section diversion tunnel tunnel floor plate first, in diversion tunnel
Deep dabbing, the shallow dabbing of side wall 3m range above, diversion tunnel arch carry out high pressure water flushing within the scope of bottom plate and side wall bottom 3m, together
When in permanent plug Upstream section diversion tunnel side, one of sealing piece is respectively set, it is embedded using pre contract mortar groove pattern, then carry out
Permanent bulkhead concrete pours；And longitudinal irrigation gallery is set in permanent plug, then carry out water flowing cooling, water flowing cooling tube
One layer is arranged every 1~2m along plug short transverse, is buried in concreting process, when concrete water flowing is cooled to river
Rockfill grouting is carried out between permanent plug crown position and former lining cutting using irrigation gallery after temperature, permanent plug is respectively segmented seam
Joint grouting is carried out between gap.
Further, the sealing piece is red copper sealing piece, and first of sealing piece is arranged apart from permanent plug upstream face
At 55~65cm, the horizontal distance between twice sealing piece is 75~85cm, and sealing piece groove width and depth are 40cm.
Further, the strength grade of concrete is C20, and seepage-resistant grade W12, freeze proof grade is F200.
Further, permanent plug carries out segmentation and every section of construction in layer by length.
Since security protection plug is temporay building in the present invention, function is only construction time temporary water dash, therefore stifled
Head concreting is not required to consider the influence of Temperature Controlling of Mass Concrete cracking, is not required to lay water flowing cooling tube, while being also not required to
Grouting treatment is carried out, can directly be poured on diversion tunnel bottom plate in work progress, with prestissimo pouring molding, when water blocking allows
There are certain sliding deformation and infiltration.Permanent plug is permanent water retaining structure, and construction quality requires height, and bulkhead concrete, which pours, to be needed
Temperature control measures are taken, guarantee that concreting does not generate crack, need to arrange water flowing cooling tube, while resisting to improve permanent plug
High water head ability, plug in diversion tunnel bottom plate and abutment wall are carved tooth socket before pouring, are carried out to diversion tunnel bottom plate and abutment wall a certain range
Dabbing increases the anti-friction coefficient of permanent plug and diversion tunnel.Furthermore upstream high water enters permanent plug and leads in order to prevent
Hole contact surface is flowed, contact surface shearing resistance mechanics parameter is reduced, sealing piece is set in permanent plug upstream side.
The invention has the following advantages that diversion tunnel under a kind of hydroelectric project high water head unfavorable geological condition provided by the invention
Safe method for blocking, compared with conventional plugging processes, the method for the present invention is directed under hydroelectric project high water head unfavorable geological condition and leads
It flows hole and blocks feature, take security protection plug and bad geological section country rock is reinforced, effectively avoided by twice guarantee
Bad geological section country rock high water head acts on the risk of lower unstability, greatly improves lock under diversion tunnel and blocks safety guarantee rate, pacifies simultaneously
Full protection plug can also stop unexpected water burst in hole, protection plugging construction operating personnel peace when inlet of diversion tunnel gate destroys
Entirely.The present invention implements strong operability, and security protection bulkhead concrete pours and bad geological section consolidation grouting simple process, closure
Effect is good, short construction period, and construction cost is low, has good application value.
Detailed description of the invention
Fig. 1 is experimental example diversion tunnel floor plan of the present invention；
Fig. 2 is experimental example security protection plug vertical section of the present invention and schematic cross section；
Fig. 3 is experimental example bad geological section surrounding rock consolidation schematic diagram of the present invention；
Fig. 4 is the permanent plug vertical section of experimental example of the present invention and schematic cross section；
In figure, 1- entrance gate, 2- goes out port strobe, 3- security protection plug, 4- bad geological section country rock, and 5- is permanently blocked up
Head, 6- drainage hole, 7- lining cutting, 8- shearing resistance tooth socket, 9- sealing piece, 10- irrigation gallery.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings and embodiments, protection scope of the present invention be not limited to
It is lower described:
Embodiment:
The safe method for blocking of diversion tunnel under a kind of hydroelectric project high water head unfavorable geological condition, comprising the following steps:
S1. descend lock: port strobe 2 carries out lower lock to inlet of diversion tunnel gate 1 and out；Using opening and closing hoisting system, door machine or
To inlet of diversion tunnel gate 1 and out, port strobe 2 carries out lower lock to person's automobile crawler crane.Gate slot dredging is carried out before lower lock, guarantees lock
Door can smoothly descend lock, diver can be used, slush pump, high-pressure air hose is cooperated to clear up；
S2. it draws water: after lower lock, the draining for installing suction pump is respectively called in inlet of diversion tunnel gate 1 and out 2 inside of port strobe
Pontoon draws water simultaneously, and water in diversion tunnel is drained；
S3. it blocks: constructing including the construction of security protection plug 3,4 strengthening construction of bad geological section country rock and permanent plug 5；
Wherein, the security protection plug 3 construction is in diversion tunnel between bad geological section upstream and inlet of diversion tunnel
Security protection plug 3 is built, fast pouring is carried out by length segmentation, every section of layering using C20 normal concrete.Security protection is stifled
First 3 size section is consistent with the diversion tunnel cross-section of river, and computational length；Security protection plug 3 blocks trip high water level, to protect not
Good geology section country rock 4 and permanent plug 5 are constructed.
4 strengthening construction of bad geological section country rock is to be consolidated by diversion tunnel drainage hole 6 to bad geological section country rock 4
Consolidation by grouting is tied, Surrounding Rock Strength is improved；
The construction of permanent plug 5 blocks forever to build permanent plug 5 at diversion tunnel seepage proof curtain as diversion tunnel
Long water retaining structure, permanent 5 size section of plug is consistent with diversion tunnel section, and computational length；
Wherein, the security protection plug and permanent plug length are calculated according to Shear Strength formula:
K-safety coefficient in formula；P-design head gross thrust；L-plug length；The friction system of f-concrete and country rock
Number；A-cross-sectional area；γ-concrete density；The Shear cohesiveness of C-concrete and country rock contact surface；S-removes crown
Outside, plug bottom surface, side and country rock or concrete contact section perimeter；In addition to crown, plug bottom surface, side and country rock connect λ-
The effective area coefficient of contacting surface.
The permanent construction of plug 5 includes tooth excavation, lining concrete surface dabbing, concreting, water flowing is cooling and fills
Slurry, specifically: multiple tracks shearing resistance tooth socket 8 is set in 5 sections of 7 bottom plates of diversion tunnel lining cutting of permanent plug first, in diversion tunnel bottom plate and side
Deep dabbing, the shallow dabbing of side wall 3m range above, diversion tunnel arch carry out high pressure water flushing within the scope of the 3m of wall bottom, while permanent
One of sealing piece 9 is respectively arranged in 5 Upstream section diversion tunnel side of plug, and sealing piece 9 is red copper sealing piece, and first of sealing piece setting exists
At permanent 5 55~65cm of upstream face of plug, the horizontal distance between twice sealing piece is 75~85cm, and sealing piece 9 is opened
Groove width and depth are 40cm, embedded using pre contract mortar groove pattern, then carry out permanent 5 concreting of plug, coagulation
Native strength grade is C20, and seepage-resistant grade W12, freeze proof grade is F200, and permanent plug 5 carries out segmentation and every section point by length
Layer construction；And longitudinal irrigation gallery 10 is set in permanent plug 5, then carry out water flowing cooling, water flowing cooling tube is along plug height
It spends direction and arranges one layer every 1~2m, buried in concreting process, it is sharp after concrete water flowing is cooled to river temperature
Rockfill grouting is carried out between permanent 5 crown position of plug and former lining cutting 7 with irrigation gallery 10, permanent plug 5 is respectively segmented gap
Between carry out joint grouting.
Experimental example:
As shown in Figure 1, Figure 2, Figure 3 and Figure 4, which is disposed with 5 diversion tunnels, i.e. left bank 1#、2#Diversion tunnel and the right side
Bank 3#、4#、5#Diversion tunnel, wherein left bank 1#、2#With right bank 3#、4#The diversion tunnel cross-section of river is having a size of 16.5m × 24.0m, right bank 5#
The diversion tunnel cross-section of river is gateway opening shape having a size of 12.0m × 16.0m, 5 diversion tunnel sectional forms；On the diversion tunnel closure phase
Trip design water blocking head is 108.88m, and upstream design head is 172m after the operation of power station, according to diversion tunnel geological conditions, lower lock
Closure sequence is followed successively by 4#→3#→1#→2#→5#Diversion tunnel need to complete (7 months) a dry season, and diversion tunnel blocks process
Middle water level gradually rises, and 5#Upstream reaches closure phase upstream design head when diversion tunnel blocks；In Diversion Tunnel excavation work progress
In, field geology, which discloses right bank diversion tunnel upstream, one section of about 200m bad geological section country rock 4 (V class), as seen from Figure 1,
If the bad geological section country rock 4 is 5#Diversion tunnel, which permanently blocks, is not finished into preceding unstability, and upstream river water will directly pour in 5#Water conservancy diversion
Hole will lead to entire engineering diversion tunnel and block failure, for this purpose, 4#It is anti-that safety is built in 4 upstream of diversion tunnel bad geological section country rock
It protects plug 3 and resists reservoir high water head, 4 unstability risk of bad geological section country rock can be effectively reduced, while can also be 4#Water conservancy diversion
Stop unexpected water burst in hole, protection plugging construction operating personnel safety and the construction of permanent plug 5 when hole entrance gate 1 destroys.This
Invention is with right bank 4#For diversion tunnel blocks, illustrate diversion tunnel safety closure side under hydroelectric project high water head unfavorable geological condition
Method, it the following steps are included:
S1. it descends lock: gate slot sediment etc. is cleared up, according to inspection result, utilized when siltation using diver on a small quantity high
Pressure ventilation pipe is cleared up along gate slot bottom sill siltation area, and slush pump pump drainage is largely used when siltation.Entrance gate is solid using 2 × 4000KN
Determine lock under hoist engine, port strobe 2 is using lock under built door machine out.
S2. it draws water: under gate after lock water blocking, pontoon being hung in hole, and is fixed with gate, then be successively centrifuged
Then suction pump installation carries out drainage pipeline installation, drainage pipeline is drawn from gate slot on the inside of gate, every 2m and gate fix tightly
It leans on.When import is drained to diversion tunnel Bottom Altitude, import pontoon is drawn to outfall drain, water discharge time is accelerated.
S3. it blocks: constructing including the construction of security protection plug 3,4 strengthening construction of bad geological section country rock and permanent plug 5；
Security protection plug 3 is constructed: 3 section of security protection plug and 4#The diversion tunnel cross-section of river is consistent, having a size of 16.5m
× 24.0m, length are calculated according to Shear formula, and safety coefficient K takes 1.1, coefficient of friction f to take 0.7, and Shear cohesion force C takes
0.6MPa, calculated value 24m.3 concrete of security protection plug is not segmented using C20 normal concrete since length is shorter,
Whole section of concreting without longitudinal joint, three layers of height point pour, and every layer height is 8m, and 3 concrete construction of security protection plug is with quick, easy
Principle does not consider temperature control measures, is not required to be in the milk；
4 strengthening construction of bad geological section country rock: by 4#(diameter 42mm is arranged by 3m × 3m, is stretched diversion tunnel drainage hole 6
Enter 2m in country rock) as grout hole, consolidation grouting reinforcing is carried out to bad geological section country rock 4, improves the intensity of country rock, while
5#4 region of diversion tunnel bad geological section increases drainage hole 6, reduces country rock seepage pressure, 6 specification of drainage hole and 4#Diversion tunnel is consistent,
Diameter is 42mm, is arranged by 3m × 3m, protrudes into 2m in country rock and arranges.
The permanent construction of plug 5 includes tooth excavation, concrete surface dabbing, concreting, water flowing is cooling and is in the milk, forever
Long 5 section of plug and 4#The diversion tunnel cross-section of river is consistent, and having a size of 16.5m × 24.0m, length is calculated according to Shear formula,
Safety coefficient K takes 7, coefficient of friction f to take 0.7, and Shear cohesion force C takes 0.6MPa, and side effective area coefficient λ value takes 0.75,
Calculated value is 77m, and scene is constructed by 80m length.
Multiple tracks shearing resistance tooth socket 8, tooth socket 8 is arranged in 5 sections of 7 bottom plates of diversion tunnel lining cutting of permanent plug first in the permanent construction of plug 5
Bottom width 200cm, deep about 10cm, tooth socket spacing 600cm, in diversion tunnel bottom plate and side wall bottom 3.0m range depth dabbing, side wall
The shallow dabbing of 3.0m range above, crown carries out high pressure water flushing, while twice red copper sealing piece 9, sealing piece 9 is arranged in upstream end
Embedded using fluting pattern, first of upstream sealing piece 9 is apart from 5 upstream face 60cm of plug, 9 horizontal space of twice sealing piece
80cm, sealing fluting is wide, is deeply 40cm, and red copper sealing piece 9 is embedded using pre contract mortar, then carries out permanent 5 coagulation of plug
Soil pours, strength grade of concrete C20, seepage-resistant grade W12, and freeze proof grade is F200, and permanent plug 5 divides three sections to pour,
Every section is divided into four layers, and section length is respectively 30m, 30m, 20m, layer height 6m, 6.5m, 5.5,6.0m, in permanent plug 5
Longitudinal irrigation gallery 10 is set, for convenient for 5 placement layer by layer of plug and grouting construction, section is the gateway opening shape of 3m × 4.2m, corridor
Road upstream end thereof then carries out water flowing cooling, cooling water pipe is managed using Ф 25PVC, along plug away from 5 upstream upstream face 12m of plug
Short transverse arranges one layer every 1.5m, buries in concreting process, last concrete water flowing is cooled to design requirement
(22 DEG C) carry out rockfill grouting, plug 5 between crown position plug 5 and former lining cutting 7 using irrigation gallery 10 after river temperature
Joint grouting is carried out between each section of parting.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, is all included within the scope of the present invention.
Claims (7)
1. the safe method for blocking of diversion tunnel under a kind of hydroelectric project high water head unfavorable geological condition, which is characterized in that including following
Step:
S1. descend lock: port strobe (2) carries out lower lock to inlet of diversion tunnel gate (1) and out；
S2. it draws water: after lower lock, the draining of installation suction pump is respectively called on the inside of inlet of diversion tunnel gate (1) and out port strobe (2)
Pontoon draws water simultaneously, and water in diversion tunnel is drained；
S3. it blocks: being applied including security protection plug (3) construction, bad geological section country rock (4) strengthening construction and permanent plug (5)
Work；
Wherein, security protection plug (3) construction is to repair between bad geological section upstream and inlet of diversion tunnel in diversion tunnel
It builds security protection plug (3), security protection plug (3) size section is consistent with the diversion tunnel cross-section of river, and computational length；
Bad geological section country rock (4) strengthening construction is to be carried out by diversion tunnel drainage hole (6) to bad geological section country rock (4)
Consolidation grouting is reinforced, and Surrounding Rock Strength is improved；
To build at diversion tunnel seepage proof curtain permanent plug (5), permanent plug (5) size is disconnected for permanent plug (5) construction
Face is consistent with diversion tunnel section, and computational length；
Wherein, the security protection plug and permanent plug length are calculated according to Shear Strength formula:
L-plug length in formula；K-safety coefficient；P-design head gross thrust；The coefficient of friction of f-concrete and country rock；
A-cross-sectional area；γ-concrete density；The Shear cohesiveness of C-concrete and country rock contact surface；λ-is blocked up in addition to crown
The effective area coefficient of head bottom surface, side and country rock contact surface；S-is in addition to crown, plug bottom surface, side and country rock or concrete
Contact section perimeter.
2. the safe method for blocking of diversion tunnel under a kind of hydroelectric project high water head unfavorable geological condition as described in claim 1,
It is characterized in that, using opening and closing hoisting system, door machine or automobile crawler crane to inlet of diversion tunnel gate (1) and outlet in step S1
Gate (2) carries out lower lock.
3. the safe method for blocking of diversion tunnel under a kind of hydroelectric project high water head unfavorable geological condition as described in claim 1,
It is characterized in that, security protection plug (3) described in step S3 uses C20 normal concrete placement layer by layer.
4. the safe method for blocking of diversion tunnel under a kind of hydroelectric project high water head unfavorable geological condition as described in claim 1,
It is characterized in that, permanent plug (5) construction is cold including tooth excavation, lining concrete surface dabbing, concreting, water flowing
But it and is in the milk, specifically: multiple tracks shearing resistance tooth socket (8) are set in permanent plug (5) section diversion tunnel lining cutting (7) bottom plate first, are being led
It flows deep dabbing, the shallow dabbing of side wall 3m range above, diversion tunnel arch within the scope of hole bottom plate and side wall bottom 3m and carries out high pressure water flushing
It washes, while one of sealing piece (9) is respectively set in permanent plug (5) Upstream section diversion tunnel side, buried using pre contract mortar groove pattern
If then carrying out permanent plug (5) concreting；And longitudinal irrigation gallery (9) is set in permanent plug (5), then open
It is cooling to open up water flowing, water flowing cooling tube arranges one layer every 1~2m along plug short transverse, it is buried in concreting process,
After concrete water flowing is cooled to river temperature using irrigation gallery (9) permanent plug (5) crown position and former lining cutting (7) it
Between carry out rockfill grouting, permanent plug (5) respectively carries out joint grouting between segmentation gap.
5. the safe method for blocking of diversion tunnel under a kind of hydroelectric project high water head unfavorable geological condition as claimed in claim 4,
It is characterized in that, the sealing piece (9) is red copper sealing piece, and first of sealing piece is arranged apart from permanent plug (5) upstream face 55
At~65cm, the horizontal distance between twice sealing piece is 75~85cm, and sealing piece (9) groove width and depth are
40cm。
6. the safe method for blocking of diversion tunnel under a kind of hydroelectric project high water head unfavorable geological condition as claimed in claim 4,
It is characterized in that, the strength grade of concrete is C20, and seepage-resistant grade W12, freeze proof grade is F200.
7. the safe method for blocking of diversion tunnel under a kind of hydroelectric project high water head unfavorable geological condition as claimed in claim 4,
It is characterized in that, permanent plug (5) carries out segmentation and every section of construction in layer by length.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910707131.6A CN110499740B (en) | 2019-08-01 | 2019-08-01 | Safe blocking method for diversion tunnel under unfavorable geological condition of high water head in hydroelectric engineering |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910707131.6A CN110499740B (en) | 2019-08-01 | 2019-08-01 | Safe blocking method for diversion tunnel under unfavorable geological condition of high water head in hydroelectric engineering |
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| CN110499740A true CN110499740A (en) | 2019-11-26 |
| CN110499740B CN110499740B (en) | 2021-06-08 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110985041A (en) * | 2019-12-31 | 2020-04-10 | 中铁隧道局集团有限公司 | Construction method for processing sudden surge of separated double-hole tunnel |
| CN112211161A (en) * | 2020-10-27 | 2021-01-12 | 中水北方勘测设计研究有限责任公司 | Method for plugging diversion bottom hole of concrete dam in severe cold area |
| CN115262499A (en) * | 2022-06-22 | 2022-11-01 | 中国水利水电第七工程局有限公司 | Diversion tunnel plugging construction method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110985041A (en) * | 2019-12-31 | 2020-04-10 | 中铁隧道局集团有限公司 | Construction method for processing sudden surge of separated double-hole tunnel |
| CN110985041B (en) * | 2019-12-31 | 2021-04-20 | 中铁隧道局集团有限公司 | Construction method for processing sudden surge of separated double-hole tunnel |
| CN112211161A (en) * | 2020-10-27 | 2021-01-12 | 中水北方勘测设计研究有限责任公司 | Method for plugging diversion bottom hole of concrete dam in severe cold area |
| CN115262499A (en) * | 2022-06-22 | 2022-11-01 | 中国水利水电第七工程局有限公司 | Diversion tunnel plugging construction method |
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