CN103266614A - Sublevel retreating type two-fluid composite grouting construction method for deep foundation pit of sandy gravel stratum - Google Patents
Sublevel retreating type two-fluid composite grouting construction method for deep foundation pit of sandy gravel stratum Download PDFInfo
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- CN103266614A CN103266614A CN2013101799093A CN201310179909A CN103266614A CN 103266614 A CN103266614 A CN 103266614A CN 2013101799093 A CN2013101799093 A CN 2013101799093A CN 201310179909 A CN201310179909 A CN 201310179909A CN 103266614 A CN103266614 A CN 103266614A
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Abstract
The invention discloses a sublevel retreating type two-fluid composite grouting construction method for a deep foundation pit of a sandy gravel stratum. The method comprises the steps of determining a grouting reinforcement scheme; conducting field measuring and setting-out; drilling holes, placing double grouting pipes downwards after the holes are formed, then installing pipe pulling devices, and pulling out drill pipes; preparing grouting fluids; conducting grouting in every other hole, conducting two-fluid composite grouting of the cement-water glass grouting fluid and the modified water glass grouting fluid, and comprehensively considering conversion of the grouting fluids according to changes of the grouting pressure, the flow and grouting positions, wherein the grouting pressure reaches 2MPa or exceeds 3MPa at the same time when the grouting quantity exceeds 80% of the designed value; and after the double pipes are lifted, repeating the grouting process till grouting is finished. The method has the advantages that the phenomenon that the grouting pipes can not be installed due to hole collapse can be avoided; advantages of the two grouting fluids are integrated by composite grouting of the two grouting fluids, waterproof curtains are achieved, meanwhile, the permeability coefficient is low, and the setting strength is high; and the problem that the pipes are pulled difficultly due to grouting fluid backflow is solved.
Description
Technical field
The invention belongs to the base pit engineering technical field, relate to a kind of job practices of the segmentation retrusive biliquid combined casting at sand-pebble layer deep foundation ditch grouting and water-proof stabilization works.
Background technology
With regard to the present situation of the tunnel of present China and underground construction slip casting, at two fluid grouting, bimetallic tube drilling rod slip casting method and sleeve valve pipe slip casting method are to adopt more, slip casting effect construction preferably at present.
General dual pipe bit bar, the blender in the mounting pipe of termination of adopting of existing dual pipe mortar depositing construction.Creep into and adopt clear water as circulation fluid, when reaching projected depth or position, the sealing end points carries out transverse injection and switches.Respectively two kinds of slurries are pressed into outer tube and interior pipe with grouting pump then, slurries mix in the blender of the termination of double pipe, carry out injection in the horizontal direction by filter screen, and slurries are injected the stratum.Slip casting adopts segmentation to retreat slip casting, reaches the soil layer consolidation effect.The shortcoming of this worker's method is to adopt drilling rod slip casting, will inevitably have the gap between drilling rod and the injected hole, very easily causes slurry reflux during slip casting, and the slurries high for consolidation strength cause difficulty in decannulation, and the construction period is longer.
The slip casting of sleeve valve pipe retrusive is after slurries are through the grouting pump pressurization, enter Grouting Pipe by tube connector, gather sleeve valve pipe slip casting pipeline section, then the pvc pipe (the valve pipe of namely tucking inside the sleeve) by being drilled with slurry discharging hole, under pressure, will be wrapped in pvc pipe other places rubber ring distending.When pressure increases to a certain degree gradually, pressurized slurries will produce filling, infiltration, densification, splitting along earth formation and flow, and slurries form induration in the stratum, thereby reach the increase formation strength, reduce the purpose of stratum permeability.The shortcoming of this worker's method is to meet sand-pebble layer, and pore-forming is difficulty relatively, and after drilling rod was extracted, sleeve valve pipe can't be installed in the hole of collapsing easily.
Existing slip casting project adopts single slurries of planting to inject usually, but comparatively speaking can there be the high-lighting shortcoming in single slurries of planting usually, as cement-sodium silicate slurries concrement transmission coefficient greatly, the property annotated is relatively poor, acidic water glass slurries concrement intensity is low.
At the prior art above shortcomings, the present invention is proposed.
Summary of the invention
In order to overcome long shortcoming of existing dual pipe slip casting construction method slurry reflux, difficulty in decannulation, duration, the slip casting of sleeve valve pipe retrusive collapse easily the hole, can't install the deficiency of sleeve valve pipe, and single outstanding shortcoming of planting the existence of slurries, the invention provides a kind of sand-pebble layer deep foundation ditch segmentation retrusive biliquid combined casting worker method.
For achieving the above object, sand-pebble layer deep foundation ditch segmentation retrusive biliquid combined casting worker method of the present invention, concrete steps are:
1, determines the grouting and reinforcing scheme
Determine the position of injected hole, arrangement, pitch of holes, hole array pitch and the drilling depth in hole, determine rig model, grouting pump model.Wherein, double employing hole quincuncial arrangement has formed certain thickness water-stop curtain to realize the purpose of water sealing consolidation.
2, in-site measurement unwrapping wire
Mainly locate work according to SURVEYING CONTROL NETWORK with total powerstation, carried out the setting-out work of thin portion size again by unwrapping wire class by drawing.
3, boring
At the characteristics of sand-pebble layer pore-forming difficulty, boring use import RPD-130C all-hydraulic drill and Korea S SH5000, SH6000, SH8000 rig pore-forming, this rig has the hydraulic pressure full automatic working, the operation moment of torsion is big, can overcome various stratum, the pore-forming efficiency height, the location is quick, accurately.
Behind the pore-forming, transfer dual Grouting Pipe, pipe extractor is installed then, extract drilling rod.
Need before the boring to be hardened in ground in the wide 2m scope around the boring, C20 concrete, thickness 30cm are adopted in sclerosis.
4, slurries preparation
A liquid: cement grout, adopt normal silicate P.O42.5 cement, add water, the water intaking gray scale is 0.8-1.3.
B liquid: the water glass slurries, adopt concentration 42Be ' water glass to mix with water 1:1.
C liquid: phosphoric acid solution, add water, getting solution concentration is 3%-8%.
A, B, C liquid stir respectively, the concentration that the consolidation time that requires according to slurries is regulated each slurries.Wherein equal-volume mixes back formation cement-sodium silicate slurries than A liquid with B liquid, and the A liquid of equal-volume ratio mixes formation acidic water glass slurries with B liquid.
5, slip casting
(a) whether the grouting amount on stratum is suitable is the embodiment of stratum consolidation and stagnant water effect, adopts every the hole injection mode, so both avoids injected hole to interact, and makes the back orifice play the effect that replenishes first orifice again, guarantees the diffusion of soil body slurries evenly.With cement-sodium silicate slurries and the compound injection of modified water glass slurries biliquid, be specially: during slip casting, annotate modified water glass slurries, cementing again-water glass slurries earlier; Two kinds of slurries mixing slip castings in the slip casting process, interior row's injected hole injects modified water glass slurries (B liquid and C liquid), effluxes and then injects cement-sodium silicate slurries (A liquid and B liquid); Want the Real Time Observation grouting pressure during slip casting, but cementing-water glass biliquid slurry (A liquid and B liquid) when pressure is big, and pressure hour can be annotated modified water glass slurries (B liquid and C liquid) with rapid filling;
The conversion of slurries is taken all factors into consideration according to the variation of grouting pressure, flow and slip casting position, and the valve switch change slurries by pulp-absorbing pipe can carry out at any time.
(b) grouting pressure control is that 60L/min, slip casting section length are to control at 20s-90s 5-10cm, slurry consolidation time at 1.5-3MPa, injection speed;
(c) when grouting amount surpass design load 80% simultaneously grouting pressure reach 2MPa, perhaps grouting pressure surpasses 3MPa, after carrying on the dual pipe, repeats above-mentioned slip casting process, finishes up to slip casting.
The present invention contrasts prior art and has the following advantages:
1, transfers Grouting Pipe earlier and pull out drilling rod again, can prevent that the phenomenon that can't install Grouting Pipe because collapsing the hole from taking place.
2, the compound injection of two kinds of slurries can realize the advantage of the comprehensive two kinds of slurries of slip casting concrement overcoming the phenomenon that occurs difficulty in decannulation because of slurry reflux, does not influence grouting quality simultaneously again.
3, the synchronous intersection of boring and slip casting carries out, and shortened the duration.
Description of drawings
When considered in conjunction with the accompanying drawings, by the reference following detailed, can more completely understand the present invention better and learn wherein many attendant advantages easily, but accompanying drawing described herein is used to provide further understanding of the present invention, constitute a part of the present invention, illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not constitute to improper restriction of the present invention, wherein:
Fig. 1 is construction flow chart of the present invention;
Fig. 2 is filling system arrangement diagram of the present invention.
The specific embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
Sand-pebble layer deep foundation ditch segmentation retrusive biliquid combined casting worker method of the present invention, its construction technology process and key points for operation are as shown in Figure 1.
1) determines the grouting and reinforcing scheme
Position, injected hole hole is distributed in the middle of the fender post and the outside, totally two arrange, pitch of holes 900mm, two row's spacing 600mm blossom types are laid staggeredly, and adopt the hole quincuncial arrangement to form certain thickness water-stop curtain to realize the purpose of water sealing consolidation, establish 1138 of injected holes altogether, φ 89mm drilling rod pore-forming, the drilling depth 0.5m that is present situation ground elevation (46.65m) to the boulder bed, the boulder bed absolute altitude is 10.62m, the dark 36.53m that holes, total boring amount is 41572m.The slip casting degree of depth be present situation water level 21.89 above 2m to the following 0.5m of boulder bed, the slip casting degree of depth is 13.77m.
2) in-site measurement unwrapping wire
Mainly locate work according to SURVEYING CONTROL NETWORK with total powerstation, carried out the setting-out work of thin portion size again by unwrapping wire class by drawing.Can use after measuring apparatus is must be after testing qualified.
3) boring
At the characteristics of sand-pebble layer pore-forming difficulty, boring use import RPD-130C all-hydraulic drill and Korea S SH5000, SH6000, SH8000 rig pore-forming, this rig has the hydraulic pressure full automatic working, the operation moment of torsion is big, can overcome various stratum, the pore-forming efficiency height, the location is quick, accurately.
This engineering adopts the boring of φ 89 drilling rods, the same drilling rod of bore diameter.Need before the boring to be hardened in ground in the wide 2m scope around the boring, C20 concrete, thickness 30cm are adopted in sclerosis.
The boring safeguard measure:
1), should hole in strict accordance with design parameters.Boring position, hole and angular deviation meet the related specifications regulation, if on-the-spot boring position, hole should be shifted and calculate definite parameter because the objective condition restriction can not meet design requirement, should carry out perforations adding in case of necessity.
2), will stablize rig in the drilling construction process, creep into steadily, the rig hand that requires to have wide experience is operated, and stops inexperienced new hand and operates rashly.
3), plant equipment is checked before per tour working, forbid machinery operation in spite of illness; Simultaneously drilling tool is checked that the well behaved drilling rod of service property (quality) and drill bit forbid to use defective drilling tool.
Behind the pore-forming, transferring diameter is the dual Grouting Pipe of 42mm, after finishing, pipe extractor is installed, and extracts drilling rod.
4, slurries preparation
Control slurries time of setting be the cement-sodium silicate slurries at 30-90s, the modified water glass slurries are controlled in the 2-10s scope.
A liquid: cement grout, adopt normal silicate P.O42.5 cement, match ratio is water: cement=1:1.2.
B liquid: the water glass slurries, adopt Baume degrees 42Be ' water glass, match ratio is water: water glass=1:1.
C liquid: accelerating admixture phosphoric acid solution, match ratio are water: phosphoric acid=1:0.05.
In order to satisfy the purpose of grouting reinforcement, need carry out the slurries preparation according to certain order.For example, the cement paste dilution should add the required water yield by each stirring body in agitator, start mixer, adds cement again and stirs more than 3 minutes.
5, slip casting
The grouting pump test running
After determining that the connection of filling system each several part is errorless, start the grouting pump packer permeability test, check grouting pump hydraulic pressure situation, system pipeline has not spillage, and whether pipeline is unimpeded.
Slurries inject
After system is ready, as shown in Figure 2, the A liquid that proportioning is good is connected to grouting pump 4 by pulp-absorbing pipe 1, and the B liquid that proportioning is good is connected to grouting pump 4 by pulp-absorbing pipe 2, the C liquid that proportioning is good is connected to grouting pump 4 by pulp-absorbing pipe 3, and grouting pump 4 is delivered to Grouting Pipe 6 by feed pipe for mortar 5 with slurries.
At first open pulp-absorbing pipe 2, pulp-absorbing pipe 3, close pulp-absorbing pipe 1 simultaneously, slurries are pressed in the stratum by dual pipe.Finish behind the design grouting amount of 100L or grouting pressure when increasing suddenly, open pulp-absorbing pipe 1, pulp-absorbing pipe 2, close pulp-absorbing pipe 3, slurries are pressed in the stratum by dual pipe, along with pulling out on the Grouting Pipe 6, grouting pressure repeats the operation of opening pulp-absorbing pipe 2, pulp-absorbing pipe 3, closing pulp-absorbing pipe 1 when reducing suddenly.Employing so both avoided injected hole to interact every the hole injection mode, made the back orifice play the effect that replenishes first orifice again, guaranteed the diffusion of soil body slurries evenly.
Pressure, grouting amount control
Observe grouting pressure by pressure meter 7, check the increase with grouting amount, pressure changing.Adopt pressure control in the slip casting process, grouting pressure control is 60L/min at 1.5-3MPa, injection speed, when the slip casting time reaches 15 minutes grouting pressure reaches 2.0Mpa simultaneously, perhaps grouting pressure surpasses 3MPa, after dual pipe is up carried 0.1m, continue slip casting, finish up to slip casting.
Though the present invention with preferred embodiment openly as above; but it is not to limit the present invention; any those skilled in the art without departing from the spirit and scope of the present invention; can make possible change and modification, so protection scope of the present invention should be as the criterion with the scope that claim of the present invention was defined.As mentioned above, embodiments of the invention are explained, but as long as not breaking away from inventive point of the present invention and effect in fact can have a lot of distortion, this will be readily apparent to persons skilled in the art.Therefore, such variation also all is included within protection scope of the present invention.
Claims (2)
1. a sand-pebble layer deep foundation ditch segmentation retrusive biliquid combined casting job practices is characterized in that, may further comprise the steps:
1) determines the grouting and reinforcing scheme, determine the position of injected hole, arrangement, injected hole spacing, injected hole array pitch and the drilling depth of injected hole, determine rig model, grouting pump model; Wherein, position, injected hole hole is distributed in the middle of the fender post and the outside, totally two arranges, and injected hole adopts quincuncial arrangement;
2) in-site measurement unwrapping wire is mainly located work according to SURVEYING CONTROL NETWORK with total powerstation, is carried out the setting-out work of thin portion size again by drawing by unwrapping wire class;
3) boring behind the pore-forming, is transferred dual Grouting Pipe, and pipe extractor is installed then, extracts drilling rod;
4) slurries preparation,
A liquid: cement grout, adopt normal silicate P.O42.5 cement, add water, the water intaking gray scale is 0.8-1.3;
B liquid: the water glass slurries, adopt concentration 42Be ' water glass to mix with water 1:1;
C liquid: phosphoric acid solution, add water, getting solution concentration is 3%-8%;
A liquid, B liquid, C liquid stir respectively, the concentration that the consolidation time that requires according to slurries is regulated each slurries; Wherein equal-volume mixes back formation cement-sodium silicate slurries than A liquid with B liquid, and the B liquid of equal-volume ratio mixes formation modified water glass slurries with C liquid;
5) slip casting,
(a) mode of injecting every the hole is adopted in slip casting, with cement-sodium silicate slurries and the compound injection of modified water glass slurries biliquid, is specially: during slip casting, annotate modified water glass slurries, cementing again-water glass slurries earlier; Two kinds of slurries mixing slip castings in the slip casting process, interior row's injected hole injects modified water glass slurries (B liquid and C liquid), effluxes and then injects cement-sodium silicate slurries (A liquid and B liquid); Want the Real Time Observation grouting pressure during slip casting, but cementing-water glass biliquid slurry (A liquid and B liquid) when pressure is big, and pressure hour can be annotated modified water glass slurries (B liquid and C liquid) with rapid filling;
(b) grouting pressure control is that 60L/min, slip casting section length are to control at 20s-90s 5-10cm, slurry consolidation time at 1.5-3MPa, injection speed;
(c) when grouting amount surpass design load 80% simultaneously grouting pressure reach 2MPa, perhaps grouting pressure surpasses 3MPa, after carrying on the dual pipe, repeats above-mentioned slip casting process, finishes up to slip casting.
2. a kind of sand-pebble layer deep foundation ditch segmentation retrusive biliquid combined casting job practices according to claim 1, it is characterized in that, in the step 3), need before the boring to be hardened in ground in the wide 2m scope around the boring, C20 concrete, thickness 30cm are adopted in sclerosis.
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| CN103485345A (en) * | 2013-09-26 | 2014-01-01 | 葛洲坝集团基础工程有限公司 | Construction method for covering layer closed porthole high-pressure curtain grouting |
| CN104533448A (en) * | 2014-11-06 | 2015-04-22 | 海南大学 | Construction method for stopping water and reinforcing end of shield tunnel in lithosphere |
| CN104674831A (en) * | 2015-02-11 | 2015-06-03 | 中国水利水电第四工程局有限公司 | Water-stopping curtain construction method |
| CN105155541A (en) * | 2015-08-21 | 2015-12-16 | 中铁城建集团第三工程有限公司 | Double-slurry closing construction method for sump |
| CN105155544A (en) * | 2015-08-04 | 2015-12-16 | 中铁建大桥工程局集团第五工程有限公司 | Grouting construction method for radius-controllable deep holes |
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| CN105971638A (en) * | 2015-03-12 | 2016-09-28 | 中铁隆工程集团有限公司 | Application of WSS construction method in shield tool changing reinforcement of water-rich sand layer |
| CN106677190A (en) * | 2017-01-24 | 2017-05-17 | 中交第二公路工程局有限公司 | Grouting construction method for underwater pebble bed foundation pit curtain |
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| CN108797621A (en) * | 2018-07-20 | 2018-11-13 | 中铁十八局集团有限公司 | A kind of water sealing structure and its construction method in rich water depth ovum gravel erratic boulder stratum front pre-grouting |
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| CN110529155A (en) * | 2019-09-26 | 2019-12-03 | 中铁隧道局集团有限公司 | A kind of drill bit only starches drilling rod and is segmented retrusive grouting method |
| CN111036660A (en) * | 2019-12-31 | 2020-04-21 | 北京高能时代环境技术股份有限公司 | In-situ curing method for heavy metal polluted sandy gravel soil layer |
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| CN103485345A (en) * | 2013-09-26 | 2014-01-01 | 葛洲坝集团基础工程有限公司 | Construction method for covering layer closed porthole high-pressure curtain grouting |
| CN104533448A (en) * | 2014-11-06 | 2015-04-22 | 海南大学 | Construction method for stopping water and reinforcing end of shield tunnel in lithosphere |
| CN104674831A (en) * | 2015-02-11 | 2015-06-03 | 中国水利水电第四工程局有限公司 | Water-stopping curtain construction method |
| CN105971637A (en) * | 2015-03-12 | 2016-09-28 | 中铁隆工程集团有限公司 | Application of WSS construction method in shield end reinforcement of water-rich sand layer |
| CN105971638A (en) * | 2015-03-12 | 2016-09-28 | 中铁隆工程集团有限公司 | Application of WSS construction method in shield tool changing reinforcement of water-rich sand layer |
| CN105155544A (en) * | 2015-08-04 | 2015-12-16 | 中铁建大桥工程局集团第五工程有限公司 | Grouting construction method for radius-controllable deep holes |
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| CN107795021A (en) * | 2016-08-30 | 2018-03-13 | 盛世安泰建筑工程（北京）有限公司 | Minimally invasive leak stopping system and its construction technology |
| CN106677190A (en) * | 2017-01-24 | 2017-05-17 | 中交第二公路工程局有限公司 | Grouting construction method for underwater pebble bed foundation pit curtain |
| CN107288658A (en) * | 2017-08-04 | 2017-10-24 | 河北天理环保科技有限公司 | Underground concrete water-proof engineering connects the casting method of stubble seam |
| CN107288658B (en) * | 2017-08-04 | 2019-04-26 | 中煤第一建设有限公司 | Underground concrete water-proof engineering connects the casting method of stubble seam |
| CN108797621A (en) * | 2018-07-20 | 2018-11-13 | 中铁十八局集团有限公司 | A kind of water sealing structure and its construction method in rich water depth ovum gravel erratic boulder stratum front pre-grouting |
| CN109723468A (en) * | 2019-01-14 | 2019-05-07 | 北京建工土木工程有限公司 | The method that slip casting is carried out to power shallow-buried tunnel engineering based on remote control slip casting trolley |
| CN110529155A (en) * | 2019-09-26 | 2019-12-03 | 中铁隧道局集团有限公司 | A kind of drill bit only starches drilling rod and is segmented retrusive grouting method |
| CN110529155B (en) * | 2019-09-26 | 2020-11-06 | 中铁隧道局集团有限公司 | Drill bit grout stopping drill rod sectional retreating type grouting method |
| CN111036660A (en) * | 2019-12-31 | 2020-04-21 | 北京高能时代环境技术股份有限公司 | In-situ curing method for heavy metal polluted sandy gravel soil layer |
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| CN112963158A (en) * | 2021-05-18 | 2021-06-15 | 北京城建道桥建设集团有限公司 | Double-liquid grouting method and slurry for pore stratum |
| CN112963158B (en) * | 2021-05-18 | 2021-10-08 | 北京城建道桥建设集团有限公司 | Double-liquid grouting method and slurry for pore stratum |
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Application publication date: 20130828 Assignee: Beijing Geotechnical Engineering Association Assignor: Beijing hanshilian Trading Co., Ltd.|Beijing municipal construction Refco Group Ltd|Beijing Jiaotong University Contract record no.: 2015990000893 Denomination of invention: Sublevel retreating type two-fluid composite grouting construction method for deep foundation pit of sandy gravel stratum Granted publication date: 20150429 License type: Exclusive License Record date: 20151026 |
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