CN108385627A - Power station diversion tunnel plugging construction method based on karst landform - Google Patents
Power station diversion tunnel plugging construction method based on karst landform Download PDFInfo
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- CN108385627A CN108385627A CN201810167192.3A CN201810167192A CN108385627A CN 108385627 A CN108385627 A CN 108385627A CN 201810167192 A CN201810167192 A CN 201810167192A CN 108385627 A CN108385627 A CN 108385627A
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- 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
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B7/00—Barrages or weirs; Layout, construction, methods of, or devices for, making same
- E02B7/20—Movable barrages; Lock or dry-dock 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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Abstract
The present invention provides the power station diversion tunnel plugging construction methods based on karst landform, it includes the following steps：S1：It designs diversion tunnel and blocks scheme, formulate based on being blocked in hole, the principle outside hole supplemented by antiseepage adds the closure scheme of permanent plug using interim plug again；S2：The interim plug construction of diversion tunnel：S21：Build construction channel and scaffold work platform；S22：Water blocking steel plate gate is installed；S23：Stoplog gate is installed；S24：It makes and draining steel pipe is installed；S25：Pour the concrete of interim plug first segment；S26：Interim plug first segment grouting leak-stopping and consolidation process；S27：Close butterfly valve；S28：Pour the concrete of interim plug second segment；S3：The construction of permanent plug.By using above-mentioned power station diversion tunnel plugging construction method, it can effectively ensure that and diversion tunnel is blocked, and then ensure that the safety of dam.
Description
Technical field
The invention belongs to hydraulic engineering technical field of construction more particularly to a kind of power station water conservancy diversion based on karst landform
Hole plugging construction method.
Background technology
Ten thousand openning Hydropower Project dam sites are located on the leather Xianghe of the north mainstreams Pan Jiang upstream, are the hydroelectric developments of the northern mainstreams Pan Jiang
The 4th grade, project scale is big（2）Type, based on power generation, key construction has：Rolled concrete arch dam, dam crest weir meter
Hole, energy dissipating cushion pool, dam body sand surfing mesoporous, diversion system, ground power house and switchyard etc..
1450 m of reservoir operation scheme elevation, dam top elevation 1452.50m, 167.5 m of maximum height of dam, is current
Building highest RCC double curvature arch dam, 2.793 × 108m3 of total reservoir storage, installed capacity of power station 180MW（2×90
MW）, 7.1 hundred million KW.h of Mean annual energy production.Diversion tunnel is located at left bank, and section configuration is gateway opening shape, and hole diameter is generally 4.5 ×
6.0m（It is wide × high）, plug section hole 5.5 × 7.2m of diameter maximum（It is wide × high）, import floor elevation 1300.10m, outlet bottom plate height
Journey 1297.10m, barrel overall length 893.10m.
On 2 9th, 2017 lower locks of inlet of diversion tunnel gate, diversion tunnel barrel country rock seeps water within 11 days 2 months, and 0+080~
0+120 sections occur that issue, issue is concentrated to be located on RightWall and crown at 3, and water yield raises continuous increasing with reservoir level
Add, March 23 maximum stream flow about 14.1m3/ s, mean flow rate about 0.895m/s, hereafter, with the fluctuation of upstream reservoir level, leakage
Water is in 13~14.1m3Between/s, the depth of water about 3m in hole, exit water level elevation about 1300m.The water is deep and the current fast in diversion tunnel, applies
Work faciostenosis, plug block there are considerable safety construct hidden danger, while face transport of materials, interim guide water, concreting,
Many construction difficult problems such as stopper structure stabilization, block extremely difficult.
Invention content
The big severe situation of security risk protrusion, short time limit, difficulty of construction is blocked in face of diversion tunnel, is analysing in depth water conservancy diversion
In hole monolithic stability problem, hole after flow velocity changing rule, formulate with the original in " based on being blocked in hole, outside hole supplemented by antiseepage "
Then, it determines to add the closure scheme of permanent plug using interim plug, interim plug is entire blocks the most key one in work
Ring, the interim plug arrangement and method for construction of primary study.It, can be effective by using above-mentioned power station diversion tunnel plugging construction method
Guarantee blocks diversion tunnel, and then ensure that the safety of dam.
In order to realize above-mentioned technical characteristic, the object of the present invention is achieved like this：Water power based on karst landform
It stands diversion tunnel plugging construction method, it includes the following steps：
S1：It designs diversion tunnel and blocks scheme, formulate based on being blocked in hole, the principle outside hole supplemented by antiseepage, using interim plug
Again plus the closure scheme of permanent plug；
S2：The interim plug construction of diversion tunnel：
S21：Build construction channel and scaffold work platform；
S22：Water blocking steel plate gate is installed；
S23：Stoplog gate is installed；
S24：It makes and draining steel pipe is installed；
S25：Pour the concrete of interim plug first segment；
S26：Interim plug first segment grouting leak-stopping and consolidation process；
S27：Close butterfly valve；
S28：Pour the concrete of interim plug second segment；
S3：The construction of permanent plug.
Interim plug section is located at pile No. 0+384.5~0+408.5 in the S1, and the permanent plug uses permanent curtain
Be in the milk plug, is located at pile No. at 0+408.5~0+438.5；
The water retarding standard of the interim plug was met flood frequency by least 100 years one and is calculated, temporary water dash peak level
1436.47m, interim plug are made of upstream water blocking steel plate gate, Stoplog gate, draining steel pipe and plug ontology, and interim plug is vertical
To being divided into two sections of constructions, including interim plug first segment and interim plug second segment；
Water burst maximum flow is 14.1m in the diversion tunnel3/ s, using draining steel pipe ejectment, the draining steel pipe divides laminates
It sets, upper layer 1 drains steel pipe one butterfly valve of every outlet setting, and the every outlet of lower layer's draining steel pipe sets at least two butterfly valves；
The water retarding standard of the Stoplog gate is up to that 70m heads calculate by gear, and temporary water dash peak level 1370m meets low water
Phase flood control requires, and setting is being led 0+384.5 at, demarcates for diversion tunnel lining cutting Duan Yuwei lining cutting sections at this, concrete lining protrusion
At bank, more drum steel are vertically installed as column in Kan Chu, lateral stitch welding drum steel before column forms closed work steel wall；
Take covering of jettisoninging, a underwater closure, the diversion tunnel of infiltrating by one system of river side curtain in inlet of diversion tunnel to big monolith bank slope
Row antiseepage ancillary measure.
The concrete construction method of the S21 is that apart from water conservancy diversion hole outlet 550m, construction road considers to be set interim plug
Standby transport of materials, pipeline laying and safe escape channel factor determine；Required equipment and materials is manually carried in hole, walkway
It is provided separately with prevailing traffic channel；Full hall steel pipe support is set up from from hole to interim plug, left width leads to as transport channel
Road is higher by the water surface at least 50cm, is completely laid with steel form, guarantees to carry the larger materials of weight such as steel pipe, shaped steel using trolley
Expect equipment；Right width completely spreads bamboo pedal, and arrangement air duct, pump line, centre are used as walkway in the wide a certain range of abutment wall；
The scaffold work platform, which is arranged in, leads the holes 0+379~0+420 section, sets up three layers of scaffold construction platform：First layer
Platform is used as draining steel pipe platform for lining, and flat surface is higher by the water surface at least 0.5m, and the second layer is used as concrete warehousing platform, platform
Face is higher by first layer flat surface at least 1.5m, and third layer is as reinforcing platform.
The concrete construction method of the S22 is：
S221：Installation limit channel steel, two abutment walls erect two channel steels at 0+383.5, as water blocking steel plate gate guide；
S222：The fixed fixed pulley of installation, one fixed pulley of installation among the places 0+383.5 crossbeam, pulley wire rope steel pipe every
From protection, steel pipe lower exit sets a minor valve, and steel pipe passes through interim plug first segment, downstream to be fixed on right side abutment wall；
S223：The fabrication and installation of water blocking steel plate gate, water blocking steel plate gate uses steel plate proximate matter, in handing on one side for steel plate proximate matter
Ribs is pitched, is welded and fixed triangle hanger at the top of steel plate proximate matter, and be connected with the suspension hook of fixed pulley.
The concrete construction method of the S23 is：
Portal frame is first installed, cucurbit is hung on crossbeam, intermediate more root posts and laterally pad cast steel welding are integral, use cucurbit
Hand fit is in place, limits shaped steel away from Stoplog gate is welded at water surface certain altitude, Stoplog gate assembly is carried out above limit shaped steel, is folded
Liangmen divides upstream and downstream two parts to make, and two parts are respectively stacked with more shaped steel, and shaped steel seam takes full weld；After draining steel pipe is in place,
Trip first part Stoplog gate is first put with cucurbit, makes Stoplog gate in draining steel pipe top closing-type under hydraulic thrust and human assistance
Steel column, reinforcement of weld, then downstream side second part Stoplog gate is put, two parts welding is integral, last residue vacancy shaped steel
It is stacked at the top of hole.
The concrete construction method of the S24 is：
S241：The platform for lining for building draining steel pipe, using full framing, standpipe is accurately positioned according to draining steel pipe spacing, is arranged
Frame pipe vertically divides three layers, and framed bent pipe is welded with both sides abutment wall joint bar, is paved with steel form, as draining steel pipe platform for lining；
S242：Steel pipe assembly is drained, two layers of arrangement of draining steel pipe point is assembled according to underwater design position when draining steel pipe assembly,
It avoids that after the completion of assembly position movement can not be carried out, levels upstream end position is 0+383.7, and lower layer's pipe downstream is 0+
399.1, upper layer pipe downstream is 0+396.1；Draining steel pipe upstream and downstream respectively sets one of steel plate for sealing water, and flange connections weldering is reinforced
Rib；
S243：Lifting is in place, and upper, middle and lower sets three hoisting gate frames before lifting, and top is longitudinal to be connected with more shaped steel, and bottom plate is lateral
Put three type steel support draining steel pipes so that draining steel pipe bottom upstream and downstream is on a horizontal line；
S244：After draining steel pipe assembly, it is welded into entirety with shaped steel, with cucurbit integral lifting, all removes platform cross bar
Afterwards, will draining steel pipe integrally to enter water in place.
The concrete construction method of the S25 is：
S251：Basic surface treatment first carries out the above lining concrete surface of the water surface and uses electric hammer artificial chiseling before concreting
Processing keeps cleaning, no dirt, ponding or flowing water；
S252：Cofferdam is made in sealing and template installation, upstream end using Stoplog gate, is spaced between draining steel pipe and film bag is first used in two sides
Grout sealing, grouting material are starched with cream, and film bag grouting pressure terminates grouting after reaching 0.3MP, then uses geotextiles and cotton stopper
Seam, downstream Side Template use combined steel formwork, and film bag is installed at interval between drain steel pipe before template, with cotton-wool stuff up a crack, with geotechnique
Cloth bedding piles up bagged cement and makees downstream cofferdam, and slurries loss is excessive in concreting process in order to prevent, is filled out before cofferdam
Build graded broken stone；
S253：Being in the milk, pipeline is pre-buried, and on the peripheries Dong Bi, pre-buried rockfill grouting and joint grouting pipeline, pipeline are fixed on using dowel
Hole wall, rockfill grouting pipe are evenly arranged more along crown contour line, and one branch pipe of setting spaced apart, branch pipe enters rock insertion
Rock mass is responsible for apart from crown certain distance, is fixed using dowel, the pre-buried contact filling in trigonum between bottom plate and levels draining steel pipe
Starch pipeline；
S254：Concreting after base surface, sealing and template, pre-embedment grouting pipe are inspected for acceptance, carries out concreting, adopts
With a grading fine-expansion pumping concreting, underwater concrete is irrigated using conduit, and conduit selects steel pipe, and lower part is the bottom of far from
Plate face certain distance, top connect material-collecting funnel, and concrete waterborne is pumped directly into storehouse；When pouring, promoted from downstream toward upstream, really
It protects and forms opposite Lentic environment as early as possible, appropriate accelerator is added in underwater concrete at aggregate bin, puts in storage after conduit mouth mixing
It is automatic closely knit, vibration compacting after above water pumping is put in storage.
The concrete construction method of the S26 is：
After the completion of interim plug first pours section, backfill and surface grouting processing are carried out, underwater portion concrete carries out grouting benefit
Strength is managed, and inclined hole is beaten at interval between draining steel pipe, and inclined hole depth is subject into underplate concrete, reinforcing scope covering draining steel
Pipe lower part all areas, it is ensured that bulkhead concrete meets design requirement with bottom plate frictional force, draining steel pipe bond stress；Interim plug
First segment pours completion, to breakthrough special disposal, then carries out coring, packer permeability test.
The concrete construction method of the S27 is：
S271：Preparation examines diversion tunnel gas vent, pulley steel cable, draining steel pipe, valve and other attachmentes and safety devices
Examination is received, and relevant design requirement is ensured compliance with；
S272：Water blocking steel-slag sand to be closed, is computed, draining steel pipe butterfly valve closes water level harmony up to top in ten minutes or so holes,
It being connected to upper pond, butterfly valve will bear the head of nearly 70m, in the case of whole butterfly valves cannot be simultaneously closed off, the butterfly finally closed
Valve bears maximum water pressure, can lead to not close, and therefore, first closes upstream water blocking steel-slag sand, water leakage drains steel after reducing
Pipe butterfly valve exposes the surface, then is closed rapidly；
S273：Draining steel pipe butterfly valve is closed, pulley wire rope is cut off, water blocking steel plate gate slides along guide rail, completely cuts off most of water
Stream, downstream water are reduced rapidly, and lower layer's draining steel pipe butterfly valve exposes the surface, and simultaneously closes off levels butterfly valve.
The concrete construction method of the S28 is：
Draining steel pipe butterfly valve is closed, after carrying out water plugged by grouting processing, interim plug first segment is taken and drawn there is also a small amount of percolating water
The small cofferdam of twice is done in row's measure in storehouse, and more than upstream cofferdam catchment cavity, and profile steel frame is installed in the cavity that catchments, system
Make pipe canopy, lay end template, drainpipe, pumping of diving under water are installed in storehouse, arrange in a row water cavity percolating water, concrete concreting without longitudinal joint, from
Downstream is poured toward upstream, using a grading fine-expansion pumping concreting；
After concrete strength is met the requirements, top is first carried out with grouting, surface grouting processing is filled out, is then shut off draining steel pipe lock
Door is fully completed interim plug construction to cavity rockfill grouting processing of catchmenting.
The construction concrete operations of permanent plug are after the completion of interim plug construction, to have dry work condition in the S3,
Permanent bulkhead concrete engineering is carried out by following process：Basement rock surface treatment, reinforcing bar system peace, template installation, installation of embedded parts, cooling
Water pipe laying, maintenance, forms irrigation gallery, consolidation grout curtain, backfill gallery concrete, water flowing cooling, connects concreting
Seam grouting, concrete use a grading fine-expansion pumping concreting.
The method have the advantages that：
1, ten thousand interim plug construction risks of openning power station diversion tunnel are very big, in conjunction with ten thousand openning power station diversion tunnel landform
Matter, hydrologic condition feature study interim plug arrangement and method for construction, in maximum stream flow about 14.1m3/ s, mean flow rate about 0.895m/s,
In the case of the depth of water about 3m, the closing of water blocking steel-slag sand cooperation butterfly valve is had studied, shaped steel Stoplog gate also serves as sealing again as safety guarantee
With template and the interim plug arrangement and method for construction of underwater concreting, it ensure that interim plug blocks successfully, applied for permanent plug
Work creates dry ground condition, and diversion tunnel blocks engineering and all completes at present, and plugging effect is good.
2, the present invention is based on the characteristics of karst landform, have studied and defined the such topography and geomorphology power station diversion tunnel envelope of adaptation
Stifled construction method, ensure that the safety of construction, and good technological guidance is provided for follow-up such diversion tunnel closure.
3, above-mentioned diversion tunnel plugging construction method, construction cost is low, short construction period, and safe.
Description of the drawings
The invention will be further described with reference to the accompanying drawings and examples.
Fig. 1 is interim stopper structure schematic diagram of the invention.
Fig. 2 is water blocking steel-slag sand structural schematic diagram of the present invention.
Fig. 3 is Stoplog gate structural schematic diagram of the present invention.
In figure：Water blocking steel plate gate 1, Stoplog gate 2, draining steel pipe 3, column 4, interim plug first segment 5, interim plug the
Two section 6, permanent plug 7, pulley wire rope 8, former concrete lining 9, empty stomach template 10, reserved cavity rockfill grouting 11, diving
Pump 12, piles up bag 14, diversion tunnel body 15, butterfly valve 16 at drainpipe 13；
It limits channel steel 101, fixed pulley 102, steel plate proximate matter 103, intersect ribs 104, triangle hanger 105.
Specific implementation mode
Embodiments of the present invention are described further below in conjunction with the accompanying drawings.
Referring to Fig. 1-3, the power station diversion tunnel plugging construction method based on karst landform, it includes the following steps：
S1：It designs diversion tunnel and blocks scheme
The big severe situation of security risk protrusion, short time limit, difficulty of construction is blocked in face of diversion tunnel, diversion tunnel is whole analysing in depth
In body stable problem, hole after flow velocity changing rule, formulate with the principle in " based on being blocked in hole, outside hole supplemented by antiseepage ",
Determine that the closure scheme for adding permanent plug using interim plug, interim plug are entirely to block a ring the most key in work,
The interim plug arrangement and method for construction of primary study.Interim plug section is located at pile No. 0+384.5~0+408.5, long 24m；Permanent curtain
Grouting plug section is located at pile No. at 0+408.5~0+438.5, and long 30m is shown in Fig. 1.
Interim plug water retarding standard was met flood frequency by 100 years one and is calculated, temporary water dash peak level 1436.47m, temporarily
Plug is made of upstream water blocking steel-slag sand 1, Stoplog gate 2, draining steel pipe 3 and plug ontology, and interim plug is longitudinally divided into two sections and applies
Work, interim plug first segment 5 pour that length is 10m, to pour length be 14m to interim plug second segment 6.
Water burst maximum flow about 14.1m in hole3/ s need to arrange 8 using draining 3 ejectment of steel pipe by flooding stream calculation
φ 800mm drain steel pipe, and point two layers of arrangement, four every layer, lower layer drains the long 15.4m of steel pipe, and upper layer drains the long 12.4m of steel pipe,
Thickness of steel pipe 10mm is drained, upper layer drains steel pipe one butterfly valve 16 of every outlet setting, and the every outlet of lower layer's draining steel pipe sets 2
Butterfly valve, butterfly valve nominal pressure are 1.6MPa.
2 water retarding standard of Stoplog gate is calculated by gear 70m heads, temporary water dash peak level 1370m, is met dry season flood control and is wanted
It asks, setting is being led 0+384.5 at, protrudes " bank " for the boundary of diversion tunnel lining cutting Duan Yuwei lining cutting sections, concrete lining at this,
5 32 steel of work are vertically installed as column 4 at " bank ", lateral 32 shaped steel of stitch welding work, forms closed " work steel wall " before column.
At 0+383.5, draining steel pipe valve needs before closing steel plate gate locating, puts down steel plate gate, reduces draining
Flow in steel pipe solves underwater 12 butterfly valves difficulty closing problem.
In order to reduce water amount of seepage in diversion tunnel, reduce flow velocity, create safe execution conditions, inlet of diversion tunnel extremely
Big monolith bank slope takes covering of jettisoninging, a underwater closure, the diversion tunnel of infiltrating by a series of antiseepage ancillary measures such as river side curtains.
S2：The interim plug construction of diversion tunnel
S21：Build construction channel and scaffold work platform
Interim plug is apart from water conservancy diversion hole outlet about 550m, and quickly to reach working face, construction road considers equipment and materials fortune
The factors such as defeated, pipeline laying and safe escape channel determine.
Required equipment and materials is manually carried entirely in hole, and walkway is provided separately with prevailing traffic channel, to improve work
Make efficiency.Full hall steel pipe support is set up from from hole to interim plug, left width is as transport channel, wide 1.5m, the water outlet of bridge floor height
Face about 50cm is completely laid with steel form, and the larger material installations of weight such as steel pipe, shaped steel are carried convenient for trolley；Right width about 3m is full
Bamboo pedal is spread, by the wide 1.5m ranges arrangement air duct of abutment wall, pump line, centre is used as walkway.
Scaffold work platform, which is arranged in, leads the holes 0+379~0+420 section, sets up three layers of scaffold construction platform：First layer
Platform is used as draining steel pipe platform for lining, and flat surface is higher by water surface 0.5m, and the second layer is used as concrete warehousing platform, and flat surface is high
Go out first layer flat surface 1.5m, third layer is as reinforcing platform.
S22：Water blocking steel plate gate 1 is installed
S221：Installation limit channel steel.Two abutment walls erect two 10# channel steels, channel steel height 6m, as steel plate lock at 0+383.5
Door guide rail.
S222：The fixed fixed pulley of installation.One fixed pulley is installed, fixed pulley steel wire rope is used at the 0+383.5 among crossbeam
Steel pipe insulation blocking, steel pipe lower exit set a minor valve, and steel pipe passes through the interim plug of first segment, and right edge is fixed in downstream
Wall.
S223：Steel plate manufacture of gate is installed.Steel plate gate specification 5.4m × 2.1m does intersection ribs, steel plate gate top
A triangle hanger is made in portion, is caught on convenient for fixed pulley, and steel plate gate initial position is shown in Fig. 2 at the high 3.0m of the water surface.
S23：Stoplog gate 2 is installed
The purpose of installation Stoplog gate is to create security context for the installation of draining steel pipe manufacturing and concrete construction.Implement such as lower section
Case：Portal frame is first installed, cucurbit is hung on crossbeam, intermediate 3 root posts and laterally pad cast steel welding are integral, with cucurbit people
Work cooperation is in place, and Stoplog gate overall structure is shown in Fig. 3.Away from water surface 1.0m weld Stoplog gate limit shaped steel, limit shaped steel above into
Row Stoplog gate is assembled, and column, Stoplog gate are all made of 32# work steel.In order to improve producing efficiency, accelerate construction progress, Stoplog gate point
Upstream and downstream two parts make, and two parts are respectively stacked with 8 shaped steel, height 1.02m, and shaped steel seam takes full weld.It is in place to drain steel pipe
Afterwards, trip first part Stoplog gate is first put with cucurbit, makes Stoplog gate tight in draining steel pipe top under hydraulic thrust and human assistance
Shaped steel column, reinforcement of weld are pasted, then puts downstream side second part Stoplog gate, two parts welding is integral, and last residue vacancy is used
Shaped steel is stacked at the top of hole.
S24：It makes and draining steel pipe 3 is installed
S241：Drain steel pipe platform for lining.Using full framing, standpipe is accurately positioned according to draining steel pipe spacing, between framed bent pipe
Away from 1.1m × 1.1m, vertical point three layers, framed bent pipe is welded with both sides abutment wall joint bar, is paved with steel form, assembled as draining steel pipe
Platform.
S242：It is assembled to drain steel pipe.Two layers of arrangement of draining steel pipe point, four every layer, pipe spreading 1.5m, caliber φ 800mm,
Wall thickness 10mm, lower layer drain the long 15.4m of steel pipe, and upper layer drains the long 12.4m of steel pipe, and upper layer drains every outlet setting one of steel pipe
Butterfly valve, the every outlet of lower layer's draining steel pipe set 2 butterfly valves, every steel pipe outlet setting pressure gauge.When draining steel pipe assembly, according to
Underwater design position is assembled, avoids that after the completion of assembly position movement can not be carried out.Levels upstream end position is 0+383.7, under
Layer pipe downstream is 0+399.1, and upper layer pipe downstream is 0+396.1.Draining steel pipe upstream and downstream respectively sets one of steel plate for sealing water, flange
Weld ribs in junction.
S243：Lifting is in place.Upper, middle and lower sets three hoisting gate frames before lifting, and top is longitudinal to be connected with 3 shaped steel, and bottom plate is horizontal
Steel pipe is drained to three type steel supports are put so that draining steel bottom upstream and downstream is on a horizontal line.
After four draining steel pipe assembly, it is welded into entirety with shaped steel, with cucurbit integral lifting, all removes platform cross
After bar, it is in place that four draining steel pipes are integrally entered into water.
S25：Pour the concrete of interim plug first segment 5
S251：Basic surface treatment.The above lining concrete surface of the water surface is first carried out before concreting uses electric hammer artificial chiseling
Processing keeps cleaning, no dirt, ponding or flowing water.
S252：Sealing and template installation.Make cofferdam, to be spaced between draining steel pipe and two sides are first used using Stoplog gate in upstream end
Film bag grout sealing, grouting material are starched with cream, and film bag grouting pressure terminates grouting after reaching 0.3MP, then uses geotextiles and cotton
Wadding stuff up a crack.Downstream Side Template uses combined steel formwork, is spaced installation film bag between draining steel pipe before template, with cotton-wool stuff up a crack, uses
Geotextiles bedding piles up bagged cement and makees downstream cofferdam, and slurries loss is excessive in concreting process in order to prevent, in cofferdam
Before fill graded broken stone.
S253：The pipeline that is in the milk is pre-buried.Pre-buried rockfill grouting and joint grouting pipeline on the peripheries Dong Bi.Pipeline is solid using dowel
Due to hole wall.Rockfill grouting pipe is evenly arranged 3 along crown contour line, and 1 branch pipe is arranged in interval 3.0m, and branch pipe enters rock 10cm,
Supervisor is fixed apart from crown 10cm using dowel, the pre-buried contact grouting pipeline in trigonum between bottom plate and levels draining steel pipe.
S254：Concreting.After base surface, sealing and template, pre-embedment grouting pipe are inspected for acceptance, carries out concrete and pour
It builds.Using a grading C40W8 fine-expansion pumping concretings, underwater concrete is irrigated using conduit, and conduit selects φ
150 steel pipes, from base surface 0.3m, top connects material-collecting funnel for lower part, and concrete waterborne is pumped directly into storehouse.When pouring, from downstream
It is promoted toward upstream, it is ensured that form opposite Lentic environment as early as possible.Appropriate accelerator is added in underwater concrete at aggregate bin, in conduit
It puts in storage after mouth mixing automatic closely knit, vibration compacting after above water pumping is put in storage.
S26：Interim 5 grouting leak-stopping of plug first segment and consolidation process
After the completion of interim plug first pours section, backfill and surface grouting processing are carried out, underwater portion concrete carries out grouting benefit
Strength is managed, and inclined hole is beaten at interval between draining steel pipe, and inclined hole depth is subject into underplate concrete, reinforcing scope covering draining steel
Pipe lower part all areas, it is ensured that bulkhead concrete meets design requirement with bottom plate frictional force, draining steel pipe bond stress.Interim plug
First segment pours completion, to breakthrough special disposal, then carries out coring, packer permeability test.
S27：Close butterfly valve
S271：Preparation.To diversion tunnel gas vent, pulley steel cable, draining steel pipe, valve and other attachmentes and safety devices inspection
Examination is received, and relevant design requirement is ensured compliance with.
S272：Close water blocking steel-slag sand.It is computed, draining steel pipe butterfly valve is closed water level harmony in ten minutes or so holes and up to pushed up
Portion is connected to upper pond, and butterfly valve will bear the head of nearly 70m, in the case of cannot simultaneously closing off whole butterfly valves, is finally closed
Butterfly valve bears maximum water pressure, can lead to not close.Therefore, upstream water blocking steel-slag sand is first closed, water leakage drains after reducing
Steel pipe butterfly valve exposes the surface, then is closed rapidly.
S273：Close draining steel pipe butterfly valve.Pulley wire rope is cut off, water blocking steel plate gate slides along guide rail, completely cuts off big portion
Flow, downstream water is divided to reduce rapidly, lower layer's draining steel pipe butterfly valve exposes the surface, and simultaneously closes off 8 butterfly valves of levels.
S28：Pour the concrete of interim plug second segment 5
Draining steel pipe butterfly valve is closed, after carrying out water plugged by grouting processing, the interim plug part of first segment is adopted there is also a small amount of percolating water
Take ejectment measure.The small cofferdam of twice is done in storehouse, more than upstream cofferdam catchment cavity, and shaped steel steel is installed in the cavity that catchments
Frame makes pipe canopy, lays end template, and 2 500 steel pipes of φ are installed in storehouse, 2 diving pumpings, arrange in a row water cavity percolating water.Coagulation
Native concreting without longitudinal joint, pours from downstream toward upstream, using a grading C40W8 fine-expansion pumping concretings.
After concrete strength is met the requirements, top is first carried out with grouting, surface grouting processing is filled out, is then shut off draining steel pipe
Gate lasts 35 days and is fully completed interim plug construction to cavity rockfill grouting processing of catchmenting.
S3：The construction of permanent plug 7
After the completion of interim plug construction, has dry work condition, permanent bulkhead concrete engineering is carried out by following process：Basement rock
Surface treatment, template installation, installation of embedded parts, cooling water pipe laying, concreting, maintenance, forms grouting corridor at reinforcing bar system peace
Road, consolidation grout curtain, backfill gallery concrete, water flowing cooling, joint grouting, concrete use a grading C40W8 microdilatancies
Pump concrete pours.
The above embodiments are only the preferred technical solution of the present invention, and are not construed as the limitation for the present invention, this hair
Technical characteristic in the technical solution that bright protection domain should be recorded with claim, including the technical solution of claim record
Equivalents are protection domain.Equivalent replacement i.e. within this range is improved, also within protection scope of the present invention.
Claims (10)
1. the power station diversion tunnel plugging construction method based on karst landform, which is characterized in that it includes the following steps：
S1：It designs diversion tunnel and blocks scheme, formulate based on being blocked in hole, the principle outside hole supplemented by antiseepage, using interim plug
Again plus the closure scheme of permanent plug；
S2：The interim plug construction of diversion tunnel：
S21：Build construction channel and scaffold work platform；
S22：Water blocking steel plate gate is installed（1）；
S23：Stoplog gate is installed（2）；
S24：It makes and draining steel pipe is installed（3）；
S25：Pour interim plug first segment（5）Concrete；
S26：Interim plug first segment（5）Grouting leak-stopping and consolidation process；
S27：Close butterfly valve；
S28：Pour interim plug second segment（5）Concrete；
S3：Permanent plug（7）Construction.
2. the power station diversion tunnel plugging construction method based on karst landform according to claim 1, which is characterized in that institute
It states interim plug section in S1 to be located at pile No. 0+384.5~0+408.5, the permanent plug（7）It is stifled using permanent grout curtain
Head is located at pile No. at 0+408.5~0+438.5；
The water retarding standard of the interim plug was met flood frequency by least 100 years one and is calculated, temporary water dash peak level
1436.47m, interim plug is by upstream water blocking steel plate gate（1）, Stoplog gate（2）, draining steel pipe（3）It constitutes, faces with plug ontology
When plug be longitudinally divided into two sections of constructions, including interim plug first segment（5）With interim plug second segment（6）；
Water burst maximum flow is 14.1m in the diversion tunnel3/ s, using draining steel pipe（3）Ejectment, the draining steel pipe（3）Divide more
Layer arrangement, upper layer 1 drain steel pipe one butterfly valve of every outlet setting（16）, the every outlet of lower layer's draining steel pipe sets at least two butterflies
Valve；
The Stoplog gate（2）Water retarding standard by gear be up to that 70m heads calculate, temporary water dash peak level 1370m meets withered
The flood control of water phase requires, and setting is being led 0+384.5 at, demarcates for diversion tunnel lining cutting Duan Yuwei lining cutting sections at this, and concrete lining is dashed forward
Go out Cheng Kan, more drum steel are vertically installed as column in Kan Chu（4）, column（4）Preceding transverse direction stitch welding drum steel, forms closed work
Steel wall；
Take covering of jettisoninging, a underwater closure, the diversion tunnel of infiltrating by one system of river side curtain in inlet of diversion tunnel to big monolith bank slope
Row antiseepage ancillary measure.
3. the power station diversion tunnel plugging construction method based on karst landform according to claim 1, which is characterized in that institute
The concrete construction method for stating S21 is that for interim plug apart from water conservancy diversion hole outlet 550m, construction road considers equipment and materials fortune
Defeated, pipeline laying and safe escape channel factor determine；Required equipment and materials is manually carried in hole, walkway and main fortune
Defeated channel is provided separately；Full hall steel pipe support is set up from from hole to interim plug, left width is as transport channel, the water outlet of channel height
Face at least 50cm is completely laid with steel form, guarantees to carry the larger material installations of weight such as steel pipe, shaped steel using trolley；
Right width completely spreads bamboo pedal, and arrangement air duct, pump line, centre are used as walkway in the wide a certain range of abutment wall；
The scaffold work platform, which is arranged in, leads the holes 0+379~0+420 section, sets up three layers of scaffold construction platform：First layer
Platform is used as draining steel pipe platform for lining, and flat surface is higher by the water surface at least 0.5m, and the second layer is used as concrete warehousing platform, platform
Face is higher by first layer flat surface at least 1.5m, and third layer is as reinforcing platform.
4. the power station diversion tunnel plugging construction method based on karst landform according to claim 1, which is characterized in that institute
The concrete construction method for stating S22 is：
S221：Installation limit channel steel（101）, two abutment walls erect two channel steels at 0+383.5, as water blocking steel plate gate（1）
Guide rail；
S222：The fixed fixed pulley of installation（102）, a fixed pulley is installed among crossbeam at the 0+383.5（102）, pulley wire
Rope（8）With steel pipe insulation blocking, steel pipe lower exit sets a minor valve, and steel pipe passes through interim plug first segment（5）, downstream is solid
Due to right side abutment wall；
S223：Water blocking steel plate gate（1）Fabrication and installation, water blocking steel plate gate（1）Using steel plate proximate matter（103）, in steel plate type
Material（103）Do intersection ribs on one side（104）, steel plate proximate matter（103）Top is welded and fixed triangle hanger（105）, and with
Fixed pulley（102）Suspension hook be connected.
5. the power station diversion tunnel plugging construction method based on karst landform according to claim 1, which is characterized in that institute
The concrete construction method for stating S23 is：
Portal frame is first installed, cucurbit is hung on crossbeam, intermediate more root posts and laterally pad cast steel welding are integral, use cucurbit
Hand fit is in place, limits shaped steel away from Stoplog gate is welded at water surface certain altitude, Stoplog gate assembly is carried out above limit shaped steel, is folded
Liangmen divides upstream and downstream two parts to make, and two parts are respectively stacked with more shaped steel, and shaped steel seam takes full weld；Drain steel pipe（3）In place
Afterwards, trip first part Stoplog gate is first put with cucurbit, makes Stoplog gate in draining steel pipe under hydraulic thrust and human assistance（3）Top
Closing-type steel column, reinforcement of weld, then downstream side second part Stoplog gate is put, two parts welding is integral, last residue vacancy
It is stacked at the top of hole with shaped steel.
6. the power station diversion tunnel plugging construction method based on karst landform according to claim 1, which is characterized in that institute
The concrete construction method for stating S24 is：
S241：Build draining steel pipe（3）Platform for lining, using full framing, standpipe according to draining steel pipe spacing be accurately positioned,
Framed bent pipe vertically divides three layers, and framed bent pipe is welded with both sides abutment wall joint bar, is paved with steel form, as draining steel pipe platform for lining；
S242：It is assembled to drain steel pipe, drains steel pipe（3）Divide two layers of arrangement, when draining steel pipe assembly, spelled according to underwater design position
Dress avoids that after the completion of assembly position movement can not be carried out, and levels upstream end position is 0+383.7, and lower layer's pipe downstream is 0+
399.1, upper layer pipe downstream is 0+396.1；Draining steel pipe upstream and downstream respectively sets one of steel plate for sealing water, and flange connections weldering is reinforced
Rib；
S243：Lifting is in place, and upper, middle and lower sets three hoisting gate frames before lifting, and top is longitudinal to be connected with more shaped steel, and bottom plate is lateral
Put three type steel support draining steel pipes（3）So that draining steel pipe（3）Bottom upstream and downstream is on a horizontal line；
S244：Drain steel pipe（3）After assembly, it is welded into entirety with shaped steel, with cucurbit integral lifting, all removes platform cross
After bar, steel pipe will be drained（3）It is in place that entirety enters water.
7. the power station diversion tunnel plugging construction method based on karst landform according to claim 1, which is characterized in that institute
The concrete construction method for stating S25 is：
S251：Basic surface treatment first carries out the above lining concrete surface of the water surface and uses electric hammer artificial chiseling before concreting
Processing keeps cleaning, no dirt, ponding or flowing water；
S252：Sealing and template installation, upstream end utilize Stoplog gate（2）Make cofferdam, drains steel pipe（3）Between be spaced and two sides are first
With film bag grout sealing, grouting material is starched with cream, and film bag grouting pressure, which reaches, terminates grouting after 0.3MP, then use geotextiles and
Cotton-wool stuff up a crack, downstream Side Template use combined steel formwork, and film bag is installed at interval between drain steel pipe before template, with cotton-wool stuff up a crack,
With geotextiles bedding, bag is piled up（14）Dress cement makees downstream cofferdam, and slurries loss is excessive in concreting process in order to prevent,
Graded broken stone is filled before cofferdam；
S253：Being in the milk, pipeline is pre-buried, and on the peripheries Dong Bi, pre-buried rockfill grouting and joint grouting pipeline, pipeline are fixed on using dowel
Hole wall, rockfill grouting pipe are evenly arranged more along crown contour line, and one branch pipe of setting spaced apart, branch pipe enters rock insertion
Rock mass is responsible for apart from crown certain distance, is fixed using dowel, the pre-buried contact filling in trigonum between bottom plate and levels draining steel pipe
Starch pipeline；
S254：Concreting after base surface, sealing and template, pre-embedment grouting pipe are inspected for acceptance, carries out concreting, adopts
With a grading fine-expansion pumping concreting, underwater concrete is irrigated using conduit, and conduit selects steel pipe, and lower part is the bottom of far from
Plate face certain distance, top connect material-collecting funnel, and concrete waterborne is pumped directly into storehouse；When pouring, promoted from downstream toward upstream, really
It protects and forms opposite Lentic environment as early as possible, appropriate accelerator is added in underwater concrete at aggregate bin, puts in storage after conduit mouth mixing
It is automatic closely knit, vibration compacting after above water pumping is put in storage.
8. the power station diversion tunnel plugging construction method based on karst landform according to claim 1, which is characterized in that institute
The concrete construction method for stating S26 is：
After the completion of interim plug first pours section, backfill and surface grouting processing are carried out, underwater portion concrete carries out grouting benefit
Strength is managed, and inclined hole is beaten at interval between draining steel pipe, and inclined hole depth is subject into underplate concrete, reinforcing scope covering draining steel
Pipe lower part all areas, it is ensured that bulkhead concrete meets design requirement with bottom plate frictional force, draining steel pipe bond stress；Interim plug
First segment pours completion, to breakthrough special disposal, then carries out coring, packer permeability test.
9. the power station diversion tunnel plugging construction method based on karst landform according to claim 1, which is characterized in that institute
The concrete construction method for stating S27 is：
S271：Preparation examines diversion tunnel gas vent, pulley steel cable, draining steel pipe, valve and other attachmentes and safety devices
Examination is received, and relevant design requirement is ensured compliance with；
S272：Water blocking steel-slag sand to be closed, is computed, draining steel pipe butterfly valve closes water level harmony up to top in ten minutes or so holes,
It being connected to upper pond, butterfly valve will bear the head of nearly 70m, in the case of whole butterfly valves cannot be simultaneously closed off, the butterfly finally closed
Valve bears maximum water pressure, can lead to not close, and therefore, first closes upstream water blocking steel-slag sand, water leakage drains steel after reducing
Pipe butterfly valve exposes the surface, then is closed rapidly；
S273：Draining steel pipe butterfly valve is closed, pulley wire rope is cut off, water blocking steel plate gate slides along guide rail, completely cuts off most of water
Stream, downstream water are reduced rapidly, and lower layer's draining steel pipe butterfly valve exposes the surface, and simultaneously closes off levels butterfly valve.
10. the power station diversion tunnel plugging construction method based on karst landform according to claim 1, which is characterized in that
The concrete construction method of the S28 is：
Close draining steel pipe butterfly valve, after carrying out water plugged by grouting processing, interim plug first segment（5）There is also a small amount of percolating waters, adopt
Ejectment measure is taken, the small cofferdam of twice is done in storehouse, more than upstream cofferdam catchment cavity, and shaped steel steel is installed in the cavity that catchments
Frame makes pipe canopy, lays end template, drainpipe is installed in storehouse（13）, immersible pump（12）It takes out, arrange in a row water cavity percolating water, coagulation
Native concreting without longitudinal joint, pours from downstream toward upstream, using a grading fine-expansion pumping concreting；
After concrete strength is met the requirements, top is first carried out with grouting, surface grouting processing is filled out, is then shut off draining steel pipe lock
Door is fully completed interim plug construction to cavity rockfill grouting processing of catchmenting；
Permanent plug in the S3（7）Construction concrete operations be after the completion of the construction of interim plug, to have dry work condition,
Permanent bulkhead concrete engineering is carried out by following process：Basement rock surface treatment, reinforcing bar system peace, template installation, installation of embedded parts, cooling
Water pipe laying, maintenance, forms irrigation gallery, consolidation grout curtain, backfill gallery concrete, water flowing cooling, connects concreting
Seam grouting, concrete use a grading fine-expansion pumping concreting.
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| 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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