CN109853477A - Change the concentrative seepage plugging structure and method that dynamic water is hydrostatic in gallery - Google Patents
Change the concentrative seepage plugging structure and method that dynamic water is hydrostatic in gallery Download PDFInfo
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- CN109853477A CN109853477A CN201811573007.7A CN201811573007A CN109853477A CN 109853477 A CN109853477 A CN 109853477A CN 201811573007 A CN201811573007 A CN 201811573007A CN 109853477 A CN109853477 A CN 109853477A
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 104
- 239000010959 steel Substances 0.000 claims abstract description 104
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 65
- 239000004567 concrete Substances 0.000 claims abstract description 22
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- 238000007689 inspection Methods 0.000 claims abstract description 17
- 230000000903 blocking effect Effects 0.000 claims abstract description 10
- 238000007789 sealing Methods 0.000 claims abstract description 8
- 238000005422 blasting Methods 0.000 claims abstract description 6
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- 239000004568 cement Substances 0.000 claims description 9
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Abstract
The present invention builds (reinforcing bar) concrete walls using existing gallery liner structure, in leakage near exit upstream and downstream respectively, and partial closure space is formed in gallery；Installation draining (grouting) steel pipe, percolating water ejectment is gone out outside gallery, dry work condition is created；Control draining steel pipe exports gate valve, forms the reversed grouting construction condition of hydrostatic, carries out reversed grout sealing using variable diameter grouting pipeline.Gallery is if any traffic requirement, then after blocking successfully and on inspection qualification, to occluding body drillhole blasting perforation upstream and downstream gallery.The present invention provides a kind of to carry out the method for blocking processing under narrow gallery, hydrostatic conditions, has many advantages, such as strong operability, safe and reliable.
Description
Technical field
Hydraulic and hydroelectric engineering technical field of the present invention, and in particular to change the concentrative seepage that dynamic water is hydrostatic in a kind of gallery and seal
Bridging structure and method.
Background technique
In hydraulic and hydroelectric engineering construction, high water head, large flow pipe channel type concentrative seepage problem happen occasionally, especially
In the karst area of complex geologic conditions, high pressure water breakdown gallery lining cutting is more universal there is a situation where leaking, such as: Hubei is clear
River every the power station He Yan, water cloth a strip of land between hills power station；The flat stockaded village's key water control project of three Cha He of Guizhou Wujiang River mainstream；The Suofengying water power in the Wujiang River
It stands, more serious concentrative seepage occurs in the gallery during water storage such as Goupitai Hydropower Station and Jia Lingjiang River pavilion saliva power station
Problem seriously affects the performance of construction phase of project progress and runtime benefit.Guizhou reservoir Left Hill Mass gallery concentrative seepage,
Leakage reaches 800L/s~1000L/s, and the normal water storage of reservoir is severely impacted.
For the concentrative seepage problem in narrow gallery, compared with multiple-project using dynamic water process mode.It is arranged according to leakage plugging
The position of implementation is applied, dynamic water process mode can be subdivided into again and infiltrate mouth closure, intermediate channel blocks and outlet blocks.Infiltrate mouth envelope
It is stifled or to build Temporary Cofferdam mainly by blocking leakage passage to infiltrating area and jettisoning Impervious Materials, it is found out simultaneously after draining ponding
It is handled again after blocking leakage passage.Intermediate channel plugging method is generally using cobble or the gradation of jettisoninging that drill on leakage passage
The modes such as material, concrete perfusion or mortar, cement slurry form continuous seepage proof curtain together, to realize the closure to leakage passage.
Outlet block it is general is directly reversely in the milk after leakage near exit drilling, be aided with small-sized antipriming, using cement grout or
Chemical grout blocks crack passage, realizes sealing purpose.
Engineering practice shows that the concentrative seepage in hydraulic and hydroelectric engineering in gallery belongs to pipeline type leakage, leakage passage more
It is connected to mostly with river or library water, infiltrates mouth and be normally at underwater even profundal zone, find out and infiltrate mouthful quantity and position difficulty
It is very big；Intermediate channel plugging method also needs to find out the development trend of leakage passage and position, but is limited to complicated topographic and geologic
Condition is often also difficult to find out.Limited by above-mentioned objective condition, infiltrate mouth or intermediate channel blocked it is how infeasible or useless
When useless power, therefore directly carry out reversed grout sealing in leakage outlet compared with multiple-project.According to engineering factual survey, low water head,
Using the method for directly carrying out grout sealing (being aided with small-sized antipriming) in outlet in the case of small flow (30L/s~100L/s)
It is feasible, and poor operability under the conditions of high water head (100m grades), big flow (1000L/s), failure case are more.
Summary of the invention
The purpose of the present invention is to the defect of the prior art, provides and change the concentration that dynamic water is hydrostatic in a kind of gallery and seep
Plugging structure and method are leaked, can be used for narrow gallery, hydrostatic conditions, has many advantages, such as strong operability, safe and reliable.
The present invention provides change the concentrative seepage plugging structure that dynamic water is hydrostatic in a kind of gallery, it is characterised in that including upper
Swim block wall, downstream block wall, the small cofferdam in upstream, the small cofferdam in downstream, draining steel pipe, draining grouting steel pipe and backfill steel pipe；On
Trip block wall and downstream block wall be respectively arranged at leakage outlet two sides and with concrete corridor crown and concrete corridor bottom
Plate and concrete corridor side wall cooperatively form closed cavity body structure；The small cofferdam in the small cofferdam in upstream and downstream, which is set to, to be leaked out
The two sides of mouth, the small cofferdam of middle and upper reaches are located between upstream block wall and leakage outlet；The small cofferdam in downstream is located at downstream block wall
Between leakage outlet；Draining steel pipe and draining grouting steel pipe one end are set to inside cavity body structure and close to leakage outlets, separately
One end passes through the small cofferdam in downstream and downstream block wall and the outside for being set to downstream block wall；Backfill steel pipe one end is located at cavity knot
Top inside structure, the other end pass through the outside that downstream block wall is set to downstream block wall.
In above-mentioned technical proposal, backfill rock ballast in upstream is provided on the outside of the block wall of upstream；It is provided on the outside of the block wall of downstream
Downstream backfills rock ballast.
In above-mentioned technical proposal, wall top, periphery, bottom and the gallery periphery of upstream block wall and downstream block wall are embedded
There is waterstop, and be drilled with joint bar, is fixedly connected with gallery liner structure.
In above-mentioned technical proposal, draining steel pipe frame is set on the first precast concrete buttress, first precast concrete
Buttress is set on concrete corridor bottom plate；Steel pipe is drained along the extending direction horizontal extension of gallery；Drain each section steel of steel pipe
Pipe is connected using ring flange；The outside that draining steel pipe is located on the outside of the block wall of downstream is equipped with draining control gate valve, it is desirable that it is pressed
Power grade is more than or equal to 15.0MPa.
In above-mentioned technical proposal, backfills outside of the steel pipe on the outside of the block wall of downstream and backfill control gate valve is installed；Backfill
Steel pipe is supported on downstream block wall wall；Two ports of backfill steel pipe are close in the two sides metope of downstream block wall wall.
In above-mentioned technical proposal, draining grouting steel pipe be set up on the second precast concrete buttress, described second pay in advance it is mixed
Solidifying soil buttress is set on concrete corridor bottom plate；Grouting steel pipe is drained along the extending direction horizontal extension of gallery；Draining grouting
Each section steel pipe of steel pipe is connected using ring flange；Draining grouting steel pipe is located at the outside on the outside of the block wall of downstream and is equipped with grouting control
Check valve, draining grouting steel pipe are located at the reducer union being provided with for connecting grouting pipeline on the outside of the block wall of downstream.
The present invention provides change the concentrative seepage method for blocking that dynamic water is hydrostatic in a kind of gallery, comprising the following steps:
The first step, the small cofferdam in landfill upstream on the gallery bottom plate of leakage outlet upstream；
Second step, in leakage near exit installation draining steel pipe and draining grouting steel pipe, draining steel pipe and draining grouting steel
One end of pipe downstream extends close to leakage outlet, the other end；
Third step, the small cofferdam in landfill downstream on the gallery bottom plate of leakage outlet downstream；
4th step, in masonry upstream block wall on the gallery bottom plate of the small cofferdam upstream in upstream；
5th step builds downstream block wall on the gallery bottom plate in the small cofferdam downstream in downstream；.
6th step backfills rock ballast after the block wall of upstream, keeps out head jointly with upstream block wall；After the block wall of downstream
Rock ballast is backfilled, keeps out head jointly with downstream block wall, and also serves as backfill plugging construction platform；
7th step, in the embedded backfill steel pipe in downstream block wall top；
8th step, by backfilling steel pipe, backfill pours into sand gravel, and filling is formed by upstream and downstream block wall and gallery lining cutting
Cavity body structure, until cavity body structure backfill is full；
9th step fastens the backfill control gate valve of tail end after the completion of sand gravel backfill, then gradually fastens the of draining steel pipe
Second control gate valve of one control gate valve and draining grouting steel pipe, makes cavity body structure become Lentic environment；
Tenth step installs reducer union outside the second control gate valve, after connecting grouting pipeline, the second control gate valve of unlatching,
Grouter, carries out reversed cementing operations using draining grouting steel pipe, and cement grout or cement underflow are reversely poured into leakage outlet
Leakage passage；After grouting to design grouting quantity or non-midge, stop grouting, and close the second control gate valve；
11st step opens whether grouting pipeline inspection draining grout pipe also seeps water after coagulating and being more than or equal to 72 hours,
Multiple filling is carried out if any infiltration, until constructing without reversed fill is terminated after infiltration；
12nd step arranges 3~5 inspection holes on the concrete block wall of downstream, water inspection is seeped water and pressed, if having
Infiltration, then grouting is until the not permeable leak of inspection hole；If inspection hole is impermeable, grout sealing inspection hole；
It is further comprising the steps of in above-mentioned technical proposal:
13rd step is penetrated through if gallery has traffic requirement using blasting method；
14th step, after gallery perforation, arrangement drilling carries out supplementary grouting on leakage near exit hole wall.
In above-mentioned technical proposal, draining steel pipe radical is determined according to water amount of seepage size, drains length of steel pipe to meet hole
Room length of drainage is principle；When necessary, using plastic drain-pipe assisted drainage, so as to the landfill in the small cofferdam in downstream.
In above-mentioned technical proposal, the small bank material in the small cofferdam in upstream and downstream is packed sand, the small cofferdam in upstream and downstream
Small cofferdam both ends contact closely with gallery two sides side wall；The small cofferdam weir height in the small cofferdam in upstream and downstream do not crossed with percolating water for
It is quasi-.
Present invention is particularly suitable for processing gallery or tunnel Intermediate High Pressures, big flow concentrative seepage problem.Water conservancy and hydropower work
Concentrative seepage in journey in gallery belongs to pipeline type leakage more, and leakage passage is connected to river or library water mostly, and it is general to infiltrate mouth
Positioned at even profundal zone under water, finds out and infiltrate mouthful quantity and position difficulty is very big；Intermediate channel is limited to complicated landform
Geological conditions is often also difficult to find out.Therefore, the present invention in leakage passage outlet, to utilize existing gallery lining cutting to form closing empty
Between, dry work and hydrostatic grouting condition are created, it is with strong points.The reversed plasma pouring constructing skill that the present invention uses is mature.Reversely
Grouting construction is in the milk regulation enforcement by existing industry, and construction technology is mature and has rule can be according to.Grouting quantity and grouting pressure etc.
It is optimized and revised according to live practice of construction situation, grouting quality is controllable, and anti-seepage effect is good.It searches and seeps the invention avoids tradition
Mouth and leakage passage are leak into, a large amount of drilling, grouting, blocks that project amount brought by processing method is big, processing is long in time limit etc. and lacks
Point.The upstream and downstream cofferdam Dui Zhu little, block wall are built, installation draining steel pipe, reversely grouting, Blasting Excavation, drilling etc. belong to often
Project under construction is advised, project amount is little, and total construction period greatly shortens compared with traditional treatment method.Such as Geheyan Hydropower Station on Qingjiang River, clearly
River Bu Ya power station concentrative seepage blocks processing as constructed using conventional grout method, and the duration needs 5~6 months, and uses this
The new method of secondary research and development can complete construction in 30d~45d.The present invention overcomes due to avoiding a large amount of drilling, grouting construction
Slurries wasting phenomenons, construction investment are greatly decreased, remarkable in economical benefits.The invention dry work and hydrostatic are in the milk item
Part, treatment effect is obviously better than the plugging effect under the conditions of dynamic water flowing, safer reliable.
Detailed description of the invention
Fig. 1 is longitudinal profile of the invention；
Fig. 2 is floor map of the invention.
Wherein, 1- leakage outlet, the small cofferdam in the upstream 2-, the small cofferdam in the downstream 3-, the upstream 4- block wall, the downstream 5- block wall,
6- backfill steel pipe, 7- draining grouting steel pipe, 71- ring flange, the second control valve of 72-, 73- reducer union, 74- grouting pipeline,
75- the second precast concrete buttress；8- drains steel pipe, the first control valve of 81-, 82- the first precast concrete buttress, the upstream 9-
Backfill sandstone, the downstream 10- backfill sandstone, 11- gallery bottom plate, 12- roof arch of gallery, 13- waterstop, 14- joint bar, 15- gallery,
16- gallery side wall.
Specific embodiment
The following further describes the present invention in detail with reference to the accompanying drawings and specific embodiments, convenient for this hair is well understood
It is bright, but they limiting the invention.
As shown in Figure 1, the present invention provides the concentrative seepage plugging structure that dynamic water is hydrostatic is changed in a kind of gallery, including it is upper
Swim block wall 4, downstream block wall 5, the small cofferdam 2 in upstream, the small cofferdam 3 in downstream, draining steel pipe 8, draining grouting steel pipe 7 and backfill steel
Pipe 6；Upstream block wall 4 and downstream block wall 5 be respectively arranged at leakage outlet 1 two sides and with concrete corridor crown 12 and mix
Solidifying soil gallery bottom plate 11 and concrete corridor side wall 16 cooperatively form closed cavity body structure, are as closed water storage space
Subsequent hydrostatic grout sealing creates conditions；
The small cofferdam 3 in the small cofferdam 2 in upstream and downstream is set to the two sides of leakage outlet 1, and the small cofferdam 2 of middle and upper reaches is located at upstream
Between block wall 4 and leakage outlet 1；The small cofferdam 3 in downstream is located between downstream block wall 5 and leakage outlet 1；Drain 8 He of steel pipe
Draining 7 one end of grouting steel pipe is set to inside cavity body structure and close to leakage outlet 1, and the other end once passes through the small cofferdam 3 in downstream
With downstream block wall 5 and be set to the outside of downstream block wall 5, drain steel pipe 8 by the percolating water of big flow along gallery ejectment extremely
Outside gallery, dry work operating environment in gallery is created；Backfill 6 one end of steel pipe is located at the top inside cavity body structure, the other end
The outside of downstream block wall 5 is set to across downstream block wall 5, top backfill steel pipe 6 reversely fills out (filling) and enters sand gravel and cement
Mortar gradually fills enclosure space.
In above-mentioned technical proposal, backfill rock ballast 9 in upstream is provided on the outside of upstream block wall 4；It is arranged on the outside of downstream block wall 5
There is downstream to backfill rock ballast 10, the backfill rock ballast in downstream also serves as operation platform.
In above-mentioned technical proposal, wall top, periphery, bottom and the gallery periphery of upstream block wall 4 and downstream block wall 5 are buried
Equipped with waterstop 13, and it is drilled with joint bar 14, is fixedly connected with gallery liner structure.
In above-mentioned technical proposal, draining steel pipe 8 is set up on the first precast concrete buttress 82, first concrete
Native buttress is set on concrete corridor bottom plate 11；Steel pipe 8 is drained along the extending direction horizontal extension of gallery；Drain steel pipe 8
Each section steel pipe is connected using ring flange 71；The outside that draining steel pipe 8 is located at 5 outside of downstream block wall is equipped with draining control lock
Valve, it is desirable that its pressure rating is more than or equal to 15.0MPa.
In above-mentioned technical proposal, backfill steel pipe 6 is equipped with backfill control gate valve in the outside in 5 outside of downstream block wall；It returns
It fills out steel pipe 6 and is supported on 5 wall of downstream block wall；Two ports of backfill steel pipe 6 are close in the two sides of 5 wall of downstream block wall
Metope.
In above-mentioned technical proposal, draining grouting steel pipe 7 be set up on the second precast concrete buttress, described second pay in advance it is mixed
Solidifying soil buttress 75 is set on concrete corridor bottom plate 11；Grouting steel pipe 7 is drained along the extending direction horizontal extension of gallery；Draining
Each section steel pipe of grouting steel pipe 7 is connected using ring flange 71；Draining grouting steel pipe 7 is located at the external peace in 5 outside of downstream block wall
Equipped with grouting control gate valve, draining grouting steel pipe 7 is located at being provided with for connecting grouting pipeline 74 on the outside of downstream block wall 5
Reducer union 73.
The present invention provides the concentrative seepage method for blocking that dynamic water is hydrostatic is changed in a kind of gallery, following step is specifically included
It is rapid:
1, the small cofferdam 2 in landfill upstream
The small cofferdam 2 in landfill upstream on the gallery bottom plate 11 of 1 upstream of leakage outlet, material are packed sand, small cofferdam two
End contacts closely with the left and right side wall of gallery.Weir height is subject to percolating water and does not cross small cofferdam.
2, installation draining steel pipe 8 and draining grout pipe 7
Leakage outlet 1 (nearby) installation draining steel pipe 8 and draining grout pipe 7, draining the general Φ 800mm of 8 caliber of steel pipe
~Φ 1200mm, draining 8 radical of steel pipe determine that length of steel pipe is to meet cavern's length of drainage for original according to water amount of seepage size
Then.When necessary, using plastic drain-pipe assisted drainage, so as to the landfill in the small cofferdam 3 in downstream.Draining steel pipe 8 is set up in prefabricated mixed
On solidifying soil buttress, each steel pipe that saves is connected using ring flange 71.First control gate valve 81 is installed outside draining steel pipe 8, it is desirable that pressure
Power grade is more than or equal to 15.0MPa.
3, the small cofferdam 3 in landfill downstream
The small cofferdam 3 in landfill downstream on the gallery bottom plate 11 in 1 downstream of leakage outlet, material are packed sand, and downstream is small to enclose
3 both ends of weir contact closely with the left and right side wall of gallery.Weir height is subject to percolating water and does not cross the small cofferdam 3 in downstream.Cofferdam structure form
It is identical as the small cofferdam 2 in upstream.The percolating water of big flow through draining steel pipe 8 along gallery ejectment to gallery outside, create gallery in do ground
Construction operation environment
4, upstream and downstream block wall 5 are built
In building 1.0m~1.5m thickness concrete walls on the gallery bottom plate 11 of 1 upstream of leakage outlet as upstream block wall 4,
Specific wall thickness is estimated according to head and grouting pressure.Wall is wide, high size is identical as gallery size.4 top of upstream block wall, periphery,
13 waterproof of waterstop is buried on bottom and gallery periphery, and is drilled with joint bar 14, and it is firm to connect with gallery liner structure.
1.0m~1.5m thickness concrete walls are built on the gallery bottom plate 11 in 1 downstream of leakage outlet as downstream block wall 5,
It is required that identical as upstream block wall 4.
Rock ballast is backfilled on the outside of upstream block wall 4, keeps out head jointly with upstream block wall 4.It is backfilled on the outside of downstream block wall 5
Rock ballast keeps out head with downstream block wall 5 jointly, and also serves as backfill plugging construction platform.
Upstream and downstream block wall 5 and gallery periphery liner structure form closing water storage space, for subsequent hydrostatic grouting envelope
It is stifled to create conditions.
5, installation backfill steel pipe 6
The embedded backfill steel pipe 6 in 5 top of block wall in downstream, high range request are higher than in closing pond under the conditions of dynamic water flowing
Pressure gate valve is installed in the water surface, the general Φ 600mm~Φ 800mm of caliber, outer end, and pressure rating is more than or equal to 15.0MPa.
6, sand gravel is backfilled
It is done in gallery under ground operating condition, upstream and 5 concreting of downstream block wall are completed and reaches design strength
Afterwards, by the backfill steel pipe 6 on downstream block wall 5, backfill pours into sand gravel, fills by upstream and downstream block wall 5 and gallery lining cutting
The closing pond of formation, until cavity body structure backfill is full.
7, water hydrostatic variable environment is moved
The backfill control gate valve of backfill 6 tail end of steel pipe is fastened after the completion of sand gravel backfill, then gradually fastens draining steel pipe 8
First control gate valve 81 creates the grouting construction condition of still pool, anti-to carry out from the outlet of the second control gate valve 72
To grouting, concentrated leakage passage is blocked.
8, reversed grouting
Reducer union 73 is installed outside the second control gate valve 72, after connecting grouting pipeline 74, opens control gate valve, grouter
Anti- filling operation is carried out, main purpose is cement grout or cement underflow reversely pouring into leakage passage.Grouting is general to be used
0.5:1 concentrated water mud or cement mortar perfusion, the control pressure of grouting pressure table generally press leakage water pressure+0.05MPa~
0.1MPa control, when conditions permit, can suitably increase.It is in the milk using draining grout pipe to design grouting quantity or non-midge, is stopped
Grouting, and close the second control gate valve 72.
After solidifying be more than or equal to 72 hours, open reversed grout pipe check grout pipe whether there are also seeping water, if any seep water into
Row is multiple to be filled, until without terminating reversely to fill construction after infiltration.
9, borehole inspection
3~5 Φ 56m~Φ 76m inspection holes are arranged on downstream block wall 5 along hole is axial, are seeped water and water is pressed to examine
It looks into, if there is inspection hole infiltration, opens the grouting of the second control gate valve 72 until not permeable leak, if impermeable, grout sealing
Inspection hole.So far, closing water blockoff entity ultimately forms.
10, Blasting Excavation
If gallery has traffic requirement, penetrated through using blasting method.It is bored on closing water blockoff solid wall along hole axis
If 8~10 pre- ceasmas of Φ 110m~Φ 130m explosion, small diameter hole is then bored again, installs small pit goaf explosive, and explosion blocks
Body penetrates through upstream and downstream gallery.
11, reinforce grouting
To ensure that leakage passage is effectively blocked, after gallery perforation, is exported in leakage and arrange Φ 56m near 1 on the wall of hole
~Φ 76m drilling carries out supplementary grouting, and pouring material is generally ordinary cement slurries, pressure with leak head+0.5MPa~
1.0MPa control.
The content that this specification is not described in detail belongs to the prior art well known to professional and technical personnel in the field.
Claims (10)
1. changing the concentrative seepage plugging structure that dynamic water is hydrostatic in a kind of gallery, it is characterised in that including upstream block wall, downstream
Block wall, the small cofferdam in upstream, the small cofferdam in downstream, draining steel pipe, draining grouting steel pipe and backfill steel pipe；Upstream block wall and downstream
Block wall be respectively arranged at leakage outlet two sides and with concrete corridor crown and concrete corridor bottom plate and concrete corridor
Road side wall cooperatively forms closed cavity body structure；The small cofferdam in the small cofferdam in upstream and downstream is set to the two sides of leakage outlet, wherein
The small cofferdam in upstream is located between upstream block wall and leakage outlet；The small cofferdam in downstream is located at downstream block wall and leaks outlet
Between；Draining steel pipe and draining grouting steel pipe one end are set to inside cavity body structure and close to leakage outlets, and the other end once passes through
The small cofferdam in downstream and downstream block wall and the outside for being set to downstream block wall；Backfill steel pipe one end is located inside cavity body structure
Top, the other end pass through the outside that downstream block wall is set to downstream block wall.
2. changing the concentrative seepage plugging structure that dynamic water is hydrostatic in gallery according to claim 1, it is characterised in that: upstream
Backfill rock ballast in upstream is provided on the outside of block wall；Backfill rock ballast in downstream is provided on the outside of the block wall of downstream.
3. changing the concentrative seepage plugging structure that dynamic water is hydrostatic in gallery according to claim 2, it is characterised in that upstream
The wall top of block wall and downstream block wall, periphery, bottom and gallery periphery are embedded with waterstop, and are drilled with joint bar, with corridor
Road liner structure is fixedly connected.
4. changing the concentrative seepage plugging structure that dynamic water is hydrostatic in gallery according to claim 3, it is characterised in that draining
Steel pipe frame is set on the first precast concrete buttress, and the first precast concrete buttress is set on concrete corridor bottom plate；
Steel pipe is drained along the extending direction horizontal extension of gallery；Each section steel pipe for draining steel pipe is connected using ring flange；Drain steel pipe position
Outside on the outside of the block wall of downstream is equipped with draining control gate valve, it is desirable that its pressure rating is more than or equal to 15.0MPa.
5. changing the concentrative seepage plugging structure that dynamic water is hydrostatic in gallery according to claim 4, it is characterised in that backfill
Outside of the steel pipe on the outside of the block wall of downstream is equipped with backfill control gate valve；Backfill steel pipe is supported on downstream block wall wall；It returns
Two ports for filling out steel pipe are close in the two sides metope of downstream block wall wall.
6. changing the concentrative seepage plugging structure that dynamic water is hydrostatic in the gallery according to claim 4, feature exists
It is set up on the second precast concrete buttress in draining grouting steel pipe, described second, which pays concrete buttress in advance, is set to concrete corridor
On road bottom plate；Grouting steel pipe is drained along the extending direction horizontal extension of gallery；Each section steel pipe for draining grouting steel pipe utilizes flange
Disk connection；Draining grouting steel pipe is located at the outside on the outside of the block wall of downstream and is equipped with grouting control gate valve, drains grouting steel pipe position
The reducer union being provided with for connecting grouting pipeline on the outside of the block wall of downstream.
7. changing the concentrative seepage method for blocking that dynamic water is hydrostatic in a kind of gallery, it is characterised in that the following steps are included:
The first step, the small cofferdam in landfill upstream on the gallery bottom plate of leakage outlet upstream；
Second step is installed in leakage near exit and drains steel pipe and draining grouting steel pipe, draining steel pipe and draining grouting steel pipe
One end downstream extends close to leakage outlet, the other end；
Third step, the small cofferdam in landfill downstream on the gallery bottom plate of leakage outlet downstream；
4th step, in masonry upstream block wall on the gallery bottom plate of the small cofferdam upstream in upstream；
5th step builds downstream block wall on the gallery bottom plate in the small cofferdam downstream in downstream；.
6th step backfills rock ballast after the block wall of upstream, keeps out head jointly with upstream block wall；It is backfilled after the block wall of downstream
Rock ballast keeps out head with downstream block wall jointly, and also serves as backfill plugging construction platform；
7th step, in the embedded backfill steel pipe in downstream block wall top；
8th step, by backfilling steel pipe, backfill pours into sand gravel, fills the chamber formed by upstream and downstream block wall and gallery lining cutting
Body structure, until cavity body structure backfill is full；
9th step, fastens the backfill control gate valve of tail end after the completion of sand gravel backfill, then gradually fastens the first control of draining steel pipe
Second control gate valve of check valve and draining grouting steel pipe, makes cavity body structure become Lentic environment；
Tenth step installs reducer union outside the second control gate valve, after connecting grouting pipeline, opens the second control gate valve, grouting
Machine carries out reversed cementing operations using draining grouting steel pipe, cement grout or cement underflow is reversely poured into the infiltration of leakage outlet
Leak channel；After grouting to design grouting quantity or non-midge, stop grouting, and close the second control gate valve；
11st step opens grout pipe inspection draining grout pipe whether there are also seeping water, if any infiltration after solidifying be more than or equal to 72 hours
Water carries out multiple filling, until constructing without reversed fill is terminated after infiltration；
12nd step arranges 3~5 inspection holes on the concrete block wall of downstream, water inspection is seeped water and pressed, if there is infiltration
Water, then grouting is until the not permeable leak of inspection hole；If inspection hole is impermeable, grout sealing inspection hole.
8. changing the concentrative seepage method for blocking that dynamic water is hydrostatic in gallery according to claim 7, it is characterised in that also wrap
Include following steps:
13rd step is penetrated through if gallery has traffic requirement using blasting method；
14th step, after gallery perforation, arrangement drilling carries out supplementary grouting on leakage near exit hole wall.
9. changing the concentrative seepage method for blocking that dynamic water is hydrostatic in gallery according to claim 7, it is characterised in that draining
Steel pipe radical is determined according to water amount of seepage size, drains length of steel pipe to meet cavern's length of drainage as principle；When necessary, it uses
Plastic drain-pipe assisted drainage, so as to the landfill in the small cofferdam in downstream.
10. changing the concentrative seepage method for blocking that dynamic water is hydrostatic in gallery according to claim 7, it is characterised in that upstream
The small bank material in small cofferdam and downstream is packed sand, and the small cofferdam both ends in the small cofferdam in upstream and downstream are contacted with gallery two sides side wall
Closely；The small cofferdam weir height in the small cofferdam in upstream and downstream is subject to percolating water and is not crossed.
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| CN109853477B (en) | 2024-02-02 |
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