CN106948320B - A kind of powerhouse of hydropower station connecting plate underlying group hole rockfill grouting technique - Google Patents
A kind of powerhouse of hydropower station connecting plate underlying group hole rockfill grouting technique Download PDFInfo
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- CN106948320B CN106948320B CN201710290561.3A CN201710290561A CN106948320B CN 106948320 B CN106948320 B CN 106948320B CN 201710290561 A CN201710290561 A CN 201710290561A CN 106948320 B CN106948320 B CN 106948320B
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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
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
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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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Abstract
The present invention provides a kind of powerhouse of hydropower station connecting plate underlying group hole rockfill grouting techniques, successively by drilling, galvanized pipe is divided into hole, fill non-return valve, form " group's filling " high-voltage tube, control pressure, it is uninterruptedly in the milk using " pipe one pump ", connecting plate basis is filled closely knit, it is quiet that the invention is moved by dynamic water control inhibition and generation, pressure control prevents from lifting deformation, paste serous material application enhancing slurries cohesive strength, and abatement grouting pressure solves the problems, such as that powerhouse of hydropower station upstream water inlet connecting plate basis is seriously come to nothing.
Description
Technical field
The present invention relates to power station grouting fields, and in particular to a kind of powerhouse of hydropower station connecting plate underlying group hole rockfill grouting
Technique.
Background technique
More cloth power stations are located on the mainstream of the Linzhi Area of Tibet Aug. 1st town village the Duo Bu Buddhist nun Yanghe River, belong to the medium-sized engineering such as III.It adopts
With gate dam formula development plan.Engineering hinge is mainly by the compound dam of riverbed sand gravel, left bank sluice, left bank generating system by piloting water etc.
Building composition.Dam Site riverbed and left bank terrace are coating, and riverbed area 52.6~190m of overburden cover is whole in a left side
The thin feature of bank thickness right bank, left bank tableland cover layer thickness variation range are 251.2~359.3m, and average thickness 300.5m is
Huge thickness sand gravel coating.
Engineering uses stage diversion, and a phase completes the antiseepage system of left bank terrace edge longitudinal cofferdam (gravel stone dam) first
System, construct under longitudinal cofferdam protection sluice and generating system by piloting water, original bed overcurrent.
Power plant building is located in the soft base of more than 300 meters of left bank 7 depth of sand gravel coating, quincunx using pitch-row 2m
8 load-bearing of cement rotary churning pile of arrangement.The construction on entire power plant building basis leans on a phase cofferdam to hang 9 antiseepage of cut-pff wall, this section entirely
Cut-pff wall bottom elevation is EL3011m, and after top is cut, cut-pff wall wall top crest level EL3035m, suspension depth is 24m.Upstream into
Water river bottom protection plateau 10 is EL3062m.Workshop water inlet sectional view is detailed in lower Fig. 1.
Workshop upstream water inlet connecting plate is located at the downstream of cut-pff wall, the upstream of lock chamber.The elevation of riverbed water level is
EL3055m, the elevation of workshop water inlet upstream connecting plate are EL3035m, and height difference reaches 20m.Workshop rich groundwater, and pressure-bearing compared with
Greatly, water burst is serious when factory building foundation concrete construction, and construction period sets pump hole 11 at the connecting plate of workshop upstream and draws water.
Workshop upstream water inlet connecting plate uses concrete cast-in-situ, and dry season constructs, and connecting plate basis is in dynamic water
Under effect, before water storage is shut off, sky is washed in a pan in the gravel stone foundation of connecting plate bottom part substantially, and connecting plate phenomenon of coming to nothing is more serious,
As the major safety risks of workshop impounding and operation, the passive water in connecting plate basis empties situation and sees Fig. 2.
Grouting construction is imperative as a result, is filled at present using two methods of common slurries and the examination of two-shot grouting, due to connection
Plate basis is come to nothing seriously, gangs up seepage flow there are connecting plate stratum, and the unfavorable phenomenons such as underground water pressure-bearing is larger, and grouting method can not be
Connecting plate bottom waits clogging, therefore both processing schemes are infeasible.
Summary of the invention
The purpose of the present invention is overcoming the problems, such as that powerhouse of hydropower station upstream water inlet connecting plate basis is seriously come to nothing, one is provided
Kind powerhouse of hydropower station connecting plate underlying group hole rockfill grouting technique.
The technical solution of the present invention is to provide a kind of powerhouse of hydropower station connecting plate underlying group hole rockfill grouting techniques, at least
The following steps are included:
Step 1) more drinking-water pipe internal drillings pre-buried on connecting plate, divide into galvanized pipe, galvanized pipe top in the hole
Higher than drinking-water pipe top, and will be sealed between drinking-water pipe top and galvanized pipe；
Step 2 installs non-return valve at the top of galvanized pipe, and multiple non-return valves are connected to a grouting packet high pressure by pipeline
Pipe, grouting are wrapped on a piece high-pressure grouting pipe of connection, " group's filling " high-voltage tube of the high-pressure grouting pipe as grouting；
Step 3) extends to " group's filling " high-voltage tube in step 2 in the elevation workshop diversion plateau of upstream, and connects grouting
Pump；
Step 4) stirs evenly grouting liquid, while reducing the flow velocity of underground water, allows at the underground water under connecting plate basis
In relative static conditions, when all pumps hole of workshop upstream and downstream no longer carries out the precipitation that draws water, controlled grouting pressure guarantees connecting plate
It is not lifted, opens grouting pump, grouting liquid is filled by " group's filling " high-voltage tube into connecting plate lower part.
Drinking-water pipe internal drilling depth is to go deep into connecting plate bottom 3m hereinafter, and bottom in galvanized pipe tripping in hole in the step 1)
Portion.
Iron sheet sealing is used between the drinking-water pipe top and galvanized pipe.
Galvanized pipe lower part tube wall is equipped with multiple through-holes, and zinc-plated bottom of the tube is equipped with gauze.
The calculating of grouting pressure is as follows in the step 4):
PTable< (PWater+PConcrete)-(PColumn+PIt holds) formula 1
In formula 1, PTableFor grouting pressure, unit MPa,
PWaterFor water storage pressure at the top of connecting plate, unit MPa,
PConcreteFor concrete gravity pressure, unit MPa,
PColumnFor starch column pressure, unit MPa,
PIt holdsFor underground bearing water, unit MPa.
In the step 4) before grouting, it is first pumped into clear water, detergent line and punching, and check the sealing of grouting pipeline
Property.
Grouting liquid in the step 4) is cement slurry, and 5kg sodium bentonite is added in every 150L cement slurry, wherein water
The mass ratio of cement and water is 0.5:1 in mud.
In the step 4) in filling process, when muddy, stopping perfusion occurring in the workshop water inlet water surface.
Beneficial effects of the present invention:
(1) this powerhouse of hydropower station connecting plate underlying group hole rockfill grouting technological operation provided by the invention is convenient, passes through
Dynamic water control inhibition and generation is moved to be quiet, and pressure control prevents from lifting deformation, and paste serous material application enhancing slurries cohesive strength cuts down grouting pressure
Solve the problems, such as that powerhouse of hydropower station upstream water inlet connecting plate basis is seriously come to nothing.
(2) this powerhouse of hydropower station connecting plate underlying group hole rockfill grouting technique provided by the invention passes through in drinking-water pipe
Drilling depth be go deep into connecting plate bottom 3m hereinafter, and bottom in galvanized pipe tripping in hole, fully ensure that grouting liquid enters connecting plate
Basic infrastructure.
(3) this powerhouse of hydropower station connecting plate underlying group hole rockfill grouting technique provided by the invention by galvanized pipe and
Iron sheet sealing is used between drinking-water pipe, prevents grouting liquid when grouting from flowing out from drinking-water pipe, and weldering can be checked by pressurization of fetching water
Leakproofness is connect, it is easy to operate.
(4) this powerhouse of hydropower station connecting plate underlying group hole rockfill grouting technique provided by the invention is in galvanized pipe lower tube
Wall is equipped with multiple through-holes, forms grouting floral tube, guarantees grouting, and to prevent the fine sand blocking grouting floral tube under influence of dynamic water,
It can not be in the milk, zinc-plated bottom of the tube is equipped with gauze.
(5) this powerhouse of hydropower station connecting plate underlying group hole rockfill grouting technique provided by the invention passes through controlled grouting mistake
Pressure in journey avoids connecting plate from lifting deformation, guarantees grouting effect.
(6) this powerhouse of hydropower station connecting plate underlying group hole rockfill grouting technique provided by the invention is first pumped before grouting
Enter clear water, detergent line and punching, and checks the leakproofness of grouting pipeline.
(7) the grouting liquid system that this powerhouse of hydropower station connecting plate underlying group hole rockfill grouting technique provided by the invention uses
Standby easy, raw material is easy to get, and cost is relatively low, and grouting liquid is formed uniformly paste mixed liquor.Paste serous material big, viscosity with cohesive force
Effect that is high, can alleviating or cut down a part of grouting pressure.It is applied in this engineering to have and prevents from lifting and enhancing slurries cohesion
The effect of power.
(8) this powerhouse of hydropower station connecting plate underlying group hole rockfill grouting technique provided by the invention is in filling process,
By observing whether the workshop water inlet water surface muddiness occurs, pipeline situation is judged, construction is smooth.
(9) this powerhouse of hydropower station connecting plate underlying group hole rockfill grouting technique grouting provided by the invention finishes, and uses
Ultrasonic Nondestructive connecting plate empties whether stratum filling is closely knit, and simplicity is reliable.
(10) this powerhouse of hydropower station connecting plate underlying group hole rockfill grouting technique provided by the invention ensures group hole backfill
Grouting by by not calculating above, this group of hole grouting meter pressure controls are in 0.15Mpa or less.
The present invention is described in further details below with reference to attached drawing.
Detailed description of the invention
Fig. 1 is powerhouse of hydropower station water inlet sectional view of the present invention；
Fig. 2 is that the passive water in connecting plate basis of the present invention part empties diagrammatic cross-section；
Fig. 3 is that connecting plate group of the present invention fills erection of equipment schematic diagram；
Fig. 4 is effect schematic diagram of the various pressure on connecting plate in filling process of the present invention；
Workshop upstream water inlet connecting plate pours form figure in Fig. 5 embodiment 4.
Appended drawing reference: 1, connecting plate；2, drinking-water pipe；3, galvanized pipe；4, non-return valve；5, grouting packet；6, high-pressure grouting pipe；7,
Sand gravel coating；8, cement rotary churning pile；9, cut-pff wall；10, upstream water inlet river bottom protection plateau；11, pump hole.
Specific embodiment
Embodiment 1:
In order to overcome the problems, such as that powerhouse of hydropower station upstream water inlet connecting plate basis is seriously come to nothing, one is present embodiments provided
Kind powerhouse of hydropower station connecting plate underlying group hole rockfill grouting technique as shown in Figure 1, at least includes the following steps:
Step 1) more 2 internal drillings of drinking-water pipe pre-buried on connecting plate 1, divide into galvanized pipe 3, galvanized pipe 3 in the hole
Top is higher than 2 top of drinking-water pipe, and will seal between 2 top of drinking-water pipe and galvanized pipe 3；
Step 2 installs non-return valve 4 at the top of galvanized pipe 3, guarantees grouting liquid only import but no export, while it is unexpected to be also prevented from grouting
It pauses, grouting liquid flows back under artesian water effect, causes grouting invalid, and multiple non-return valves are connected to a grouting by pipeline and wrap
5 high-voltage tubes, grouting are wrapped and are connected on a high-pressure grouting pipe 6 on 5, " group's filling " high-voltage tube of the high-pressure grouting pipe 6 as grouting, such as
Shown in Fig. 3；
Step 3) extends to " group's filling " high-voltage tube in step 2 in the elevation workshop diversion plateau of upstream, and connects grouting
Pump；
Step 4) stirs evenly grouting liquid, while reducing the flow velocity of underground water, allows at the underground water under connecting plate basis
In relative static conditions, when all pumps hole 11 of workshop upstream and downstream no longer carries out the precipitation that draws water, controlled grouting pressure guarantees connection
Plate 1 is not lifted, and opens grouting pump, grouting liquid is filled by " group's filling " high-voltage tube into 1 lower part of connecting plate.
This powerhouse of hydropower station connecting plate underlying group hole rockfill grouting technological operation provided by the invention is convenient, by moving water
Controlization is moved to be quiet, and pressure control prevents from lifting deformation, paste serous material application enhancing slurries cohesive strength, and abatement grouting pressure solves
The problem of powerhouse of hydropower station upstream water inlet connecting plate basis is seriously come to nothing.
Embodiment 2:
On the basis of embodiment 1, a kind of powerhouse of hydropower station connecting plate underlying group hole rockfill grouting is present embodiments provided
Technique, in order to guarantee that grouting liquid enters connecting plate basic infrastructure, 2 internal drilling depth of drinking-water pipe is deeply connection in the step 1)
1 bottom 3m of plate is hereinafter, and bottom in 3 tripping in hole of galvanized pipe.
Iron sheet sealing is used between 2 top of drinking-water pipe and galvanized pipe 3, prevents grouting liquid when grouting from flowing out from drinking-water pipe,
And welded seal can be checked by pressurization of fetching water, it is easy to operate.
The 3 lower part tube wall of galvanized pipe is equipped with multiple through-holes, grouting floral tube is formed, in connecting plate casting process, to subtract
Pressure water, the pre-buried drinking-water pipe 2 of diameter 150mm in concrete.But in the grouting of group hole, in order to be in the milk, slurries are deeply connected
The gravel stone foundation of board bottom portion, more preferably filling seepage channel, stratum of coming to nothing, reach better consolidation effect, in pre-buried pumping before grouting
Gravel stone foundation 3m is goed deep into drilling in water pipe 2, but sand and gravel stratum is not easy pore-forming, so grout pipe must be divided into, divides into grouting
The sand plugging that the easily passive water of bottom of the tube washes away, slurries can not pour into, so being equipped on the 3 lower part tube wall of galvanized pipe divided into more
A through-hole, quincuncial arrangement are wrapped up to prevent sand closure using small-bore gauze, are formed such floral tube that is in the milk, are moved water stratum
Sand is not easy pipe laying, plugging, in filling process, hole wall, bottom hole pulp simultaneously, can preferably fill come to nothing, aerial stratum.
Embodiment 3:
On the basis of embodiment 2, a kind of powerhouse of hydropower station connecting plate underlying group hole rockfill grouting is present embodiments provided
Technique, the calculating of grouting pressure is as follows in the step 4):
PTable< (PWater+PConcrete)-(PColumn+PIt holds) formula 1
In formula 1, PTableFor grouting pressure, unit MPa,
PWaterFor water storage pressure at the top of connecting plate, unit MPa,
PConcreteFor concrete gravity pressure, unit MPa,
PColumnFor starch column pressure, unit MPa,
PIt holdsFor underground bearing water, unit MPa.
The grouting of group hole easily causes concrete connecting plate and lifts, therefore pressure becomes an important control parameter, the grouting of group hole
When, single connecting plate bottom receives the different pressure effect in 5 sources, and downward pressure has: water storage pressure at the top of connecting plate
PWaterWith concrete gravity pressure PConcrete；Upwarding pressure has: grouting meter pressure PTable, slurry column pressure PColumnWith underground bearing water PIt holds, grouting
Fig. 4 is shown in effect of the various pressure on connecting plate in the process, it is ensured that connecting plate is not lifted to ensure: being upwarded pressure
The sum of be less than downward the sum of pressure, can be obtained by formula 1:
(PTable+PColumn+PIt holds)-(PWater+PConcrete) 0 formula 2 of <
Act on single connecting plate bottom pressure PConcrete=F/SConcrete= mConcreteg/SConcrete, wherein mConcreteIndividually to connect board concrete matter
Amount, g 10N/kg, SConcreteFor the area of connecting plate；
Act on the water pressure P of single connecting plateWater=mWaterg/ SConcrete=ρWaterghWater/SConcrete, wherein ρWaterFor the density of water, hWaterFor factory
Room water inlet connecting plate surface elevation and thereon after water burst static level elevation height difference；
Act on the pressure P on single connecting plateColumn=mSlurryg/S=ρSlurrysColumnhSlurryg/SConcrete, wherein ρSlurryFor serum density, used because being in the milk
The slurry of 0.5:1, density 1.83g/cm3, hSlurryHeight difference for grouting platform height to bottom plate of connecting plate elevation, sColumnFor cutting for slurry pipe
Area；
Act on the pressure P of the underground bearing water on single connecting plateIt holds=ρWaterghIt holds, wherein hIt holdsTo be gushed in connecting plate built-in pipe
The maximum height of water.
In conclusion being calculated according to formula 1, be in the milk meter pressure PTableMaximum value, i.e., in filling process, meter pressure control is
When less than maximum value, it can guarantee that connecting plate is not lifted substantially.
In the step 4) before grouting, it is first pumped into clear water, detergent line and punching, and check the sealing of grouting pipeline
Property.
Grouting liquid in the step 4) is cement slurry, and 5kg sodium bentonite is added in every 150L cement slurry, wherein water
The mass ratio of cement and water is 0.5:1 in mud.Grouting liquid is formed uniformly paste mixed liquor.Paste serous material have cohesive force it is big,
Viscosity is high, can alleviate or cut down the effect of a part of grouting pressure.Being applied to have in this engineering prevents from lifting and enhancing slurries
The effect of cohesiveness.
In the step 4) in filling process, when workshop water inlet water surface appearance muddiness, show pipeline blocking, grouting liquid
It returns, it should stop perfusion at once.
Whether when grouting finishes, it is closely knit to empty stratum filling using Ultrasonic Nondestructive connecting plate.
Embodiment 4:
More cloth powerhouse of hydropower stations upstream water inlet connecting plate uses concrete cast-in-situ, is divided altogether according to workshop water inlet length
9 pieces of connecting plates, construction joint uses Copper water stop between connecting plate, and monolithic connecting plate pours the substantially long 7m of size × wide 5m × thickness
3m, the construction of factory building foundation lean on a phase cofferdam to hang cut-pff wall antiseepage entirely, this section of cut-pff wall bottom elevation is EL3011m, top chisel
After removing, cut-pff wall wall top crest level EL3035m, suspension depth is 24m, and upstream water inlet river bottom protection plateau is EL3062m, workshop upstream
Water inlet connecting plate is located at the downstream of cut-pff wall, the upstream of lock chamber, and the elevation of riverbed water level is EL3055m, on workshop water inlet
Swim connecting plate elevation be EL3035m, height difference reach 20m, workshop upstream water inlet connecting plate pour form as shown in figure 5,2# and
Each pre-buried 6 diameter 150mm steel pipes drinking-water pipes the most of two pieces of connecting plates of 7#, carry out drainage pressure-reducing as vent, using group
Hole rockfill grouting technique is in the milk, and steps are as follows:
Step 1) each 6 pre-buried drinking-water pipe internal drillings on two pieces of connecting plates of 2# and 7#, divide into galvanized pipe in the hole,
Drinking-water pipe internal drilling depth be go deep into connecting plate bottom 3m hereinafter, and bottom in galvanized pipe tripping in hole, galvanized pipe top be higher than take out
Water pipe top, galvanized pipe lower part tube wall are equipped with multiple through-holes, form grouting floral tube, and will be between drinking-water pipe top and galvanized pipe
It with iron sheet sealing, prevents grouting liquid when grouting from flowing out from drinking-water pipe, and welded seal, behaviour can be checked by pressurization of fetching water
Make easy；
Step 2 installs non-return valve at the top of galvanized pipe, guarantees grouting liquid only import but no export, while being also prevented from grouting and surprisingly stopping
, grouting liquid flows back under artesian water effect, causes grouting invalid, non-return valve connects high-voltage tube again, and 6 high-voltage tubes are connected to one
On high-pressure grouting pipe, " group's filling " high-voltage tube of the high-pressure grouting pipe as grouting, as shown in Figure 3；
Step 3) extends to two " group's filling " high-voltage tubes in the elevation workshop diversion plateau of upstream, and respectively connection grouting
Pump, grouting are uninterruptedly in the milk using " pipe one pump "；
Step 4) stirs evenly grouting liquid, while reducing the flow velocity of underground water, allows at the underground water under connecting plate basis
In relative static conditions, when all pumps hole 11 of workshop upstream and downstream no longer carries out the precipitation that draws water, workshop water inlet connecting plate is by water
Flood and rise to 20m height, relative static conditions, at this time grouting 3062 elevation of platform, by this two high-pressure grouting pipes into
Row group hole rockfill grouting, controlled grouting pressure obtain P according to formula 1TableMaximum value, control PTableMaximum value once, guarantee connect
Fishplate bar is not lifted, and opens grouting pump, grouting liquid is filled by " group's filling " high-voltage tube into connecting plate lower part.
PTableMaximum value calculating process it is as follows:
(PTable+PColumn+PIt holds)-(PWater+PConcrete) 0 formula 2 of <
P can be obtained by formula 2Table< (PWater+PConcrete)-(PColumn+PIt holds)
Act on single connecting plate bottom pressure
PConcrete=F/SConcrete= mConcreteg/SConcrete≈2.5*103*3*5*7*10/(5*7)/1000000≈0.075Mpa；
Act on the water pressure of single connecting plate
PWater=mWaterg/ SConcrete=ρWaterghWater/SConcrete1000*5*7*( 3055-3035)*10/(5*7)=0.2Mpa；
Act on the pressure on single connecting plate
PColumn=mSlurryg/S=ρSlurrysColumnhSlurryg/SConcrete
≈ 1830*(3.14*0.0252* (3062-3032)) * 10/35 ≈ 0.00003Mpa, which can be ignored；
Act on the pressure of the underground bearing water on single connecting plate
PIt holds=ρWaterghIt holds1000*10*6=0.06Mpa。
(P can be obtainedWater+PConcrete)-(PColumn+PIt holds)=(0.2+0.075)-(0.00003+0.06)=0.21 Mpa,
PTable< (PWater+PConcrete)-(PColumn+PIt holds), i.e. PTable0.21 Mpa of <, in filling process, meter pressure control is less than 0.21
When Mpa, it can guarantee that connecting plate is not lifted substantially.
7# connecting plate reaches termination condition, cement injection amount 108t, bentonite 45t in 36 minutes 21 hours in perfusion；2# connects
48 points of fishplate bar Continuous Perfusion 22 hours, cement injection 125t, bentonite 56t detects connecting plate using Ultrasonic Nondestructive
After processing, it is substantially closely knit that original empties stratum filling on basis, without biggish aerial phenomenon, reaches expected rockfill grouting effect,
It is able to satisfy power station water storage safe operation.
The foregoing examples are only illustrative of the present invention, does not constitute the limitation to protection scope of the present invention, all
It is within being all belonged to the scope of protection of the present invention with the same or similar design of the present invention.
Claims (9)
1. a kind of powerhouse of hydropower station connecting plate underlying group hole rockfill grouting technique, it is characterised in that: at least include the following steps:
Step 1) more drinking-water pipe (2) internal drillings pre-buried on connecting plate (1), divide into galvanized pipe (3), galvanized pipe in the hole
(3) top is higher than drinking-water pipe (2) top, and will seal between drinking-water pipe (2) top and galvanized pipe (3)；
Step 2 installs non-return valve (4) at the top of galvanized pipe (3), and multiple non-return valves are connected to a grouting packet (5) by pipeline
High-voltage tube, grouting are wrapped and are connected on a high-pressure grouting pipe (6) on (5), " group's filling " high pressure of the high-pressure grouting pipe (6) as grouting
Pipe；
Step 3) extends to " group's filling " high-voltage tube in step 2 in upstream water inlet river bottom protection plateau (10), and connects grouting pump；
Step 4) stirs evenly grouting liquid, while reducing the flow velocity of underground water, and the underground water under connecting plate basis is allowed to be in phase
To stationary state, when all pumps hole (11) of workshop upstream and downstream no longer carries out the precipitation that draws water, controlled grouting pressure guarantees connecting plate
(1) it is not lifted, opens grouting pump, grouting liquid is filled by " group's filling " high-voltage tube into connecting plate (1) lower part.
2. powerhouse of hydropower station connecting plate underlying group hole rockfill grouting technique as described in claim 1, it is characterised in that: the step
It is rapid 1) in drinking-water pipe (2) internal drilling depth be go deep into connecting plate (1) bottom 3m hereinafter, and bottom in galvanized pipe (3) tripping in hole.
3. powerhouse of hydropower station connecting plate underlying group hole rockfill grouting technique as described in claim 1, it is characterised in that: the pumping
Iron sheet sealing is used between water pipe (2) top and galvanized pipe (3).
4. powerhouse of hydropower station connecting plate underlying group hole rockfill grouting technique as described in claim 1, it is characterised in that: the plating
Zinc pipe (3) lower part tube wall is equipped with multiple through-holes, and galvanized pipe (3) bottom is equipped with gauze.
5. powerhouse of hydropower station connecting plate underlying group hole rockfill grouting technique as described in claim 1, it is characterised in that: the step
It is rapid 4) in grouting pressure calculating it is as follows:
PTable< (PWater+PConcrete)-(PColumn+PIt holds)
In formula, PTableFor grouting pressure, unit MPa,
PWaterFor water storage pressure at the top of connecting plate, unit MPa,
PConcreteFor concrete gravity pressure, unit MPa,
PColumnFor starch column pressure, unit MPa,
PIt holdsFor underground bearing water, unit MPa.
6. powerhouse of hydropower station connecting plate underlying group hole rockfill grouting technique as described in claim 1, it is characterised in that: the step
It is rapid 4) in front of grouting, be first pumped into clear water, detergent line and punching, and check the leakproofness of grouting pipeline.
7. powerhouse of hydropower station connecting plate underlying group hole rockfill grouting technique as described in claim 1, it is characterised in that: the step
It is rapid 4) in grouting liquid be cement slurry, and 5kg sodium bentonite, wherein cement and water in cement slurry are added in every 150L cement slurry
Mass ratio be 0.5:1.
8. powerhouse of hydropower station connecting plate underlying group hole rockfill grouting technique as described in claim 1, it is characterised in that: the step
It is rapid 4) in filling process, when the workshop water inlet water surface occurs muddy, stop perfusion.
9. powerhouse of hydropower station connecting plate underlying group hole rockfill grouting technique as described in claim 1, it is characterised in that: work as grouting
It finishes, whether empty stratum filling using Ultrasonic Nondestructive connecting plate closely knit.
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|---|---|---|---|---|
| CN109610280B (en) * | 2018-12-04 | 2020-09-04 | 上海圭目机器人有限公司 | Automatic plate lifting system for airport pavement and control method thereof |
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