CN107761753B - A kind of foundation pit water burst rapid rescue slip casting method for blocking - Google Patents
A kind of foundation pit water burst rapid rescue slip casting method for blocking Download PDFInfo
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- CN107761753B CN107761753B CN201710977510.8A CN201710977510A CN107761753B CN 107761753 B CN107761753 B CN 107761753B CN 201710977510 A CN201710977510 A CN 201710977510A CN 107761753 B CN107761753 B CN 107761753B
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Abstract
The invention discloses a kind of foundation pit water burst rapid rescue slip casting method for blocking, comprising the following steps: dangerous situation carries out the placement of timely back-pressure and relief tube after occurring；It determines foundation pit EXIT POINT position, surface drilling construction is carried out at bored concrete pile certain position, that is, rotary churning pile axial location in foundation pit side-wall, at drilling construction to conduit pipe position, at lower certain length casing and lower pvc pipe to conduit pipe position；Slip casting pump conduit is connect with pvc pipe, grouting pump is opened and pumps cement slurry list liquid；When having observed cement slurry outflow from relief tube, start to infuse rapid hardening plasmoid humor, slurries in conduit pipe harden rapidly by condensation, until relief tube no longer there are flowing out, so far realizes the complete closure to conduit pipe.This method can realize the quick blocking of foundation pit side-wall water burst, play a significant role to the processing of foundation pit side-wall discharge disaster emergency.
Description
Technical field
The present invention relates to a kind of foundation pit water burst rapid rescue slip casting method for blocking, belong to foundation pit, tunnel and other underground works
The anti-field of harnessing the river of journey.
Background technique
In Excavation Process, since geological conditions is poor, the lateral runoff of underground water or rotary churning pile pile quality are bad,
It frequently results in foundation pit side-wall and the percolating water even high hydraulic pressure water burst of big flow occurs, easily cause foundation pit side-wall not in time due to handling
Landslide, causes serious accident, for such situation, realizes rapid rescue, reduces loss as far as possible and be necessary, slip casting
Effective means of the method as water reinforcement is applied to always in the improvement of underground engineering water disaster, but is still faced at present very much
Technical problem, conduit pipe can not determine effectively, and slurries are spread in vain etc. makes rescue can not be successfully development, delay danger
In the best improvement period of feelings, cause serious accident.Therefore a kind of foundation pit water burst rapid rescue slip casting method for blocking is needed
Change current condition.
Summary of the invention
The purpose of the invention is to overcome the shortcomings of above-mentioned existing salvage of foundation pits method, it is quick to provide a kind of foundation pit water burst
It speedily carries out rescue work slip casting method for blocking.
To achieve the above object, the present invention adopts the following technical solutions:
A kind of foundation pit water burst rapid rescue slip casting method for blocking, comprising the following steps:
Step 1: after water burst occurs in foundation pit side-wall, taking back-pressure measure rapidly, sandbag and anti-is accumulated on the inside of foundation pit side-wall
Firming layer, and embedding relief tube；
Further, the relief tube inner end is placed in EXIT POINT position, and external port binds one layer of strainer, and outer end passes through anti-
Firming layer exposes to outside back-pressure soil layer；Or spiral stainless steel filtering net is used, and set sandbag in relief tube near ports pad, prevent
Stopping leak pressure pipe position is mobile；
Step 2: vertical range of the measurement EXIT POINT apart from foundation pit side-wall edge, then rational drilling scheme, drills
Position selects at the central axes of the rotary churning pile on the outside of bored concrete pile, at drilling depth to EXIT POINT position；
Step 3: after the completion of hole to be drilled, lower certain length casing simultaneously carries out sealing to casing using injecting paste material, and sealing is complete
Cheng Hou carries out cleaning bottom of hole and is simultaneously tested by filling the water to casing sealing quality, after the assay was approved, by pvc pipe down toward designated depth,
I.e. and at EXIT POINT parallel position；
Step 4: after slip casting pump conduit is connect with pvc pipe, clear water is pumped, checks pipeline closure and connectivity,
After all prepare it is errorless after, open cement slurry inlet pipe road, carry out cement slurry single fluid grouting, while keep a close eye on foundation pit side-wall and
Back-pressure layer situation, prevents running pulp, generates certain influence to foundation pit side-wall and back-pressure layer；And observe relief tube pipeline water quality
Whether situation of change has cement grout outflow；
Step 5: to be seen to change note rapid hardening plasmoid humor to after there is cement grout outflow, setting time controls in a certain range
It is interior, allow slurries to reside in conduit pipe as far as possible.After relief tube no longer there are flowing out, i.e., entire conduit pipe is by whole
After closure, slip casting terminates.
Further, in the step 1, back-pressure is had in time, depending on the circumstances, when soil body back-pressure is unable to reach
When effect, it is proposed that use concrete back-pressure；The embedding of relief tube will be as far as possible near EXIT POINT, pressure release length of tube and filter
Screen distance is depending on specific stratum particle size.
Further, in the step 3, bore diameter, casing length and pvc pipe diameter depending on Specific construction situation,
This method is to this without particular/special requirement.It is more accurate to drilling depth and Grouting Pipe length requirement, it is determined depending on EXIT POINT position.
Further, in the step 4, the purpose of cement injection is the search procedure of conduit pipe, passes through cement slurry
Whether the position for judging conduit pipe can be flowed out from relief tube with underground water.The cement injection list liquid time does not limit specifically
Fixed, view is in relief tube subject to cement slurry outflow, if grouting pump hypertonia (theoretically no more than 1.5 times of hydraulic pressure) or foundation pit
Side wall, which running pulp phenomenon occurs then, should stop infusing single slurry；After waiting for a period of time, new bore slip casting again is bored or opened again.
Further, in the step 5, the selection of rapid hardening plasmoid humor without limitation, generally cement-sodium silicate double liquid
Or chemical plasmoid humor, if selecting cement-sodium silicate double liquid, under normal conditions, ratio of mud 1:1, cement slurry and waterglass
The ratio between also be 1:1, wherein strength of cement grout grade be not less than be P.O32.5, density 1.69g/cm3, modulus of water glass is in 2-3
Between, Baume degrees Be is between 35-40；If selecting chemical plasmoid humor, should be avoided as far as possible in principle to underground water and surrounding ring
The pollution in border；Slip casting blocking time is specifically determined by field technician depending on relief tube no longer there are flowing out.
The invention mainly relates to method, how grouting pump, high-voltage tube, injecting paste material etc. are excessively repeated using not doing.
Beneficial effects of the present invention are as follows:
The present invention has studied a kind of foundation pit water burst rapid rescue slip casting method for blocking, realizes slip casting method in foundation pit side-wall water
Effective use in evil improvement, compared with currently existing method, this method is successfully realized the accurate determination of conduit pipe, slurries
Effective diffusion, to related rescue have certain exemplary role.
The present invention realizes a kind of foundation pit water burst rapid rescue slip casting method for blocking, has the advantage that
1, the accurate determination that conduit pipe is realized by the mobility of cement grout reduces unnecessary lookup underground
The work in water source.
2, rapid hardening plasmoid humor setting time is controllable, it can be achieved that effective diffusions of slurries, had both reduced slurries due to solidifying
The knot time is excessively slow and is lost in vain with underground water, in turn avoids slurries because setting time is too fast, and leads to the blocking of Grouting Pipe.
3, a kind of foundation pit water burst rapid rescue slip casting method for blocking of the present invention is realized in conduit pipe determination and note
The saving on blocking time is starched, and guarantees the water blockoff quality of rescue, it can be achieved that foundation pit dangerous situation quickly controls.
4, it reduces and speedily carries out rescue work and schedule delays bring economic loss.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present application, and the application's shows
Meaning property embodiment and its explanation are not constituted an undue limitation on the present application for explaining the application.
Fig. 1 is foundation pit conduit pipe Groundwater Flow schematic diagram；
Fig. 2 is that cement list liquid spreads schematic diagram in conduit pipe；
Fig. 3 is that rapid hardening plasmoid humor realizes that conduit pipe blocks schematic diagram completely；
In figure: 1 --- the outer stratum of foundation pit；2 --- rotary churning pile；3 --- bored concrete pile；4 --- soil nail wall；5 --- water guide is logical
Road；6 --- back-pressure soil layer；7 --- relief tube；8 --- loaded filter；9 --- direction of groundwater flow；10 --- support sandbag；
11 --- stratum is not excavated in foundation pit；12 --- phreatic line；13 --- underground water；14 --- cement slurry list liquid；15——
Grouting Pipe；16 --- rapid hardening plasmoid humor.
Specific embodiment
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
As background technique is introduced, exist in the prior art in Excavation Process, due to geological conditions is poor,
It is lauched lateral runoff or rotary churning pile pile quality is bad, frequently result in the foundation pit side-wall generation percolating water even high hydraulic pressure of big flow and gush
Water easily causes foundation pit side-wall landslide due to handling not in time, causes serious accident, for such situation, realizes quick
It speedily carries out rescue work, reduces loss as far as possible and be necessary, effective means of the slip casting method as water reinforcement is applied to always underground engineering
In the improvement of water disaster, but many technical problems are still faced at present, conduit pipe can not effectively determine that slurries are spread in vain
Deng so that rescue can not be successfully development, it is delayed the best improvement period of dangerous situation, causes serious accident.Therefore one is needed
Foundation pit rapid rescue method is planted to change current condition.
In order to solve technical problem as above, present applicant proposes a kind of foundation pit water burst rapid rescue slip casting method for blocking.
In a kind of typical embodiment of the application, as shown in Figure 1, providing a kind of foundation pit water burst rapid rescue slip casting
Method for blocking, specific as follows:
Step 1: after water burst occurs in foundation pit side-wall, taking back-pressure measure rapidly, and embedding in back-pressure soil layer 6 in advance let out
Pressure pipe 7 makes relief tube inner end be placed in EXIT POINT position, and external port sets loaded filter 8, the soil body is prevented to be largely lost with underground water, therefore
One layer of strainer should be bound, or uses spiral stainless steel filtering net, sandbag 10 is supportted in relief tube near ports advance expenditure, prevents relief tube
Position is mobile, and when underground water is flowed out along conduit pipe from relief tube, and there is no compared with big yield at back-pressure layer other positions
Water outflow, then back-pressure reaches effect；
Step 2: vertical range of the measurement EXIT POINT apart from foundation pit side-wall edge, to guarantee vertically optional starting point end binding
The tape measure of plummet.Then rational drills scheme, bore position selection on the outside of the bored concrete pile at the central axes of rotary churning pile,
At drilling depth to EXIT POINT position.The reason is as follows that: 1, apart from foundation pit side-wall edge certain distance, prevent because of drilling and later period
Foundation pit side-wall caused by slip casting destroys；2, leakage water disaster occurs for foundation pit side-wall is made since rotary churning pile pile-forming effect is bad mostly
At, drilling, which is arranged at rotary churning pile central axes, realizes the reinforcement to rotary churning pile to greatest extent；
Step 3: after construction hole to be drilled, lower certain length casing simultaneously carries out sealing to casing using rapid hardening plasmoid humor,
After the completion of sealing, carries out cleaning bottom of hole and tested by water filling to casing sealing quality, after the assay was approved, by pvc pipe down toward finger
Depthkeeping degree, i.e., and at EXIT POINT parallel position；
Step 4: after slip casting pump conduit is connect with pvc pipe, opening junction pressure relief pipe valve and pump clear water, inspection
The closure for testing grouting pipeline connection after no problem to be checked, opens cement slurry inlet pipe road, carries out cement slurry single fluid grouting,
Foundation pit side-wall and back-pressure layer situation are kept a close eye on simultaneously, prevents from generating certain shadow to foundation pit side-wall and back-pressure layer because of running pulp
It rings.Relief tube pipeline variation of water is observed at the same time, it may be assumed that whether has cement grout outflow；
Step 5: to be seen to change note rapid hardening plasmoid humor to after there is cement grout outflow, setting time controls in a certain range
It is interior, allow slurries to reside in conduit pipe as far as possible.After relief tube no longer there are flowing out, i.e., entire conduit pipe is by whole
After closure, slip casting terminates.
Step 6: after water disaster is disposed, carrying out the follow-up works such as pressure release and the cleaning of grouting pipeline.
Further, in the step 1, back-pressure is had in time, depending on the circumstances, when soil body back-pressure is unable to reach
When effect, it is proposed that use concrete back-pressure；The embedding of relief tube will be as far as possible near EXIT POINT, pressure release length of tube and filter
Screen distance is depending on specific stratum particle size.
Further, in the step 3, bore diameter, casing length and pvc pipe diameter depending on Specific construction situation,
This method is to this without particular/special requirement.It is more accurate to drilling depth and Grouting Pipe length requirement, it is determined depending on EXIT POINT position.
Further, in the step 4, the process for starting cement injection is the search procedure of conduit pipe, passes through water
Whether mud can flow out the position for judging conduit pipe from relief tube with underground water.The cement injection list liquid time is not made to have
Body limits, and view is in relief tube subject to cement slurry outflow, if grouting pump hypertonia 1.5 times of hydraulic pressure (theoretically no more than) or
Foundation pit side-wall, which running pulp phenomenon occurs then, should stop infusing single slurry, after waiting for a period of time, bore or open again new bore slip casting again.
Further, in the step 5, the selection of rapid hardening plasmoid humor without limitation, generally cement-sodium silicate double liquid
Or chemical plasmoid humor, if selecting cement-sodium silicate double liquid, under normal conditions, ratio of mud 1:1, cement slurry and waterglass
The ratio between also be 1:1, wherein strength of cement grout grade be not less than be P.O32.5, density 1.69g/cm3, modulus of water glass is in 2-3
Between, Baume degrees Be is between 35-40；If selecting chemical plasmoid humor, should be avoided as far as possible in principle to underground water and surrounding ring
The pollution in border；Slip casting blocking time is specifically determined by field technician depending on relief tube no longer there are flowing out.
Embodiment:
The Qingdao region R3 line Lingshan defends 195 meters of station length, is two layers of underground station；Big mileage open cut segment length 322
Rice is single-storeyed frame structure.Locating landforms are strand accumulation area, mostly littoral sediment, river deposit composition, show as shore
Extra large marsh band landforms.Station original ground absolute altitude+5.0m, stratum is from top to bottom successively are as follows: plain fill 3m, the 3m of medium coarse sand containing mud,
Silty clay 3m, medium coarse sand 6m (clay content 8%), the 2.2m of gravelly sand containing cohesive soil, severely-weathered tufa stone 2.6m.Substrate is located at gravelly sand
Layer and severely-weathered layer junction.
When the May in 2016 of the morning 8 on the 23rd, when extremely -3.5m is tried to dig downwards in the western end of foundation pit, water burst at side wall discovery two, along stake
Between pour in foundation pit, total flow about 40m3/ h, average water pressure reach 1.3MPa.Back-pressure is backfilled immediately, and uses relief tube pressure release, and
For EXIT POINT position everywhere, the method is drilled and carries out slip casting closure according to the present invention at earth's surface, complete from back-pressure
At the complete closure to final realization foundation pit side-wall percolating water, total used time 4h.Using cement slurry list liquid and cement soluble glass paste
Slip casting is starched, amounts to and uses 10 tons of cement, waterglass 1.2t.Salvage of foundation pits is realized on the basis of reducing engineering cost to the greatest extent
Quickly processing, effectively improves construction speed.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention
The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
Claims (10)
1. a kind of foundation pit water burst rapid rescue slip casting method for blocking, which comprises the following steps:
Step 1: after water burst occurs in foundation pit side-wall, taking back-pressure measure rapidly, back-pressure soil layer and sand are accumulated on the inside of foundation pit side-wall
Bag, and embedding relief tube；
Step 2: measuring vertical range of the EXIT POINT apart from foundation pit side-wall edge, then rational drilling scheme, bore position
At the central axes for selecting the rotary churning pile on the outside of bored concrete pile, at drilling depth to EXIT POINT position；
Step 3: after the completion of hole to be drilled, lower certain length casing simultaneously carries out sealing to casing using injecting paste material, after the completion of sealing,
Carry out cleaning bottom of hole simultaneously by fill the water test to casing sealing quality, after the assay was approved, by pvc pipe down toward designated depth, i.e., with
At EXIT POINT parallel position；
Step 4: after slip casting pump conduit is connect with pvc pipe, pumping clear water, pipeline closure and connectivity are checked, to one
Cut prepare it is errorless after, open cement slurry inlet pipe road, carry out cement slurry single fluid grouting, while keeping a close eye on foundation pit side-wall and back-pressure
Layer situation, prevents running pulp, generates certain influence to foundation pit side-wall and back-pressure layer；And observe relief tube pipeline change of water quality
Whether situation has cement grout outflow；
Step 5: to be seen to change note rapid hardening plasmoid humor to after there is cement grout outflow, setting time controls in a certain range, allows
Slurries reside in conduit pipe as far as possible, and after relief tube no longer there are flowing out, i.e., entire conduit pipe is all blocked
Afterwards, slip casting terminates.
2. a kind of foundation pit water burst rapid rescue slip casting method for blocking as described in claim 1, which is characterized in that the step 1
In, the relief tube inner end is placed in EXIT POINT position, and outer end passes through back-pressure soil layer, exposes to outside back-pressure soil layer；External port is tied up
It pricks one layer of strainer or uses spiral stainless steel filtering net.
3. a kind of foundation pit water burst rapid rescue slip casting method for blocking as described in claim 1, which is characterized in that the relief tube
Near ports pad sets sandbag, prevents relief tube position mobile.
4. a kind of foundation pit water burst rapid rescue slip casting method for blocking as described in claim 1, which is characterized in that when in step 1
The soil body and sandbag back-pressure when being unable to reach effect, using concrete back-pressure.
5. a kind of foundation pit water burst rapid rescue slip casting method for blocking as described in claim 1, which is characterized in that relief tube buries
Setting will be as far as possible near EXIT POINT, and pressure release length of tube and aperture of filter screen are depending on specific stratum particle size.
6. a kind of foundation pit water burst rapid rescue slip casting method for blocking as described in claim 1, which is characterized in that the step 3
In, bore diameter, casing length and pvc pipe diameter are depending on Specific construction situation, to drilling depth and Grouting Pipe length requirement
It is relatively accurate, it is determined depending on EXIT POINT position.
7. a kind of foundation pit water burst rapid rescue slip casting method for blocking as described in claim 1, which is characterized in that the step 4
In, the cement injection list liquid time is subject in relief tube cement slurry and flows out, if grouting pump hypertonia or foundation pit side-wall are run
Slurry phenomenon should then stop infusing single slurry；After waiting for a period of time, new bore slip casting again is bored or opened again.
8. a kind of foundation pit water burst rapid rescue slip casting method for blocking as described in claim 1, which is characterized in that the step 5
In, rapid hardening plasmoid humor is chemical plasmoid humor.
9. a kind of foundation pit water burst rapid rescue slip casting method for blocking as claimed in claim 8, which is characterized in that the step 5
In, the selection principle of the chemical plasmoid humor is the pollution that should be avoided as far as possible to underground water and ambient enviroment.
10. a kind of foundation pit water burst rapid rescue slip casting method for blocking as described in claim 1, which is characterized in that the step 5
In, if selecting cement-sodium silicate double liquid, under normal conditions, ratio of mud 1:1, the ratio between cement slurry and waterglass are also 1:
1, it is P.O32.5, density 1.69g/cm that wherein strength of cement grout grade, which is not less than,3, modulus of water glass is between 2-3, Baume
Be is spent between 35-40, and slip casting blocking time is specifically determined by field technician depending on relief tube no longer there are flowing out.
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| CN108999195B (en) * | 2018-08-22 | 2019-10-29 | 山东大学 | It is a kind of block the larger water burst of deep-foundation side wall stratum in the safe grouting construction process of step heap weir formula |
| CN109098197A (en) * | 2018-09-04 | 2018-12-28 | 中电建南方建设投资有限公司 | One kind being based on mud jackstone stratum water gushing in pit emergency processing construction method |
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