CN101343988B - Deep layer cement-soil mixing pile grouting water-blocking method for artesian area - Google Patents
Deep layer cement-soil mixing pile grouting water-blocking method for artesian area Download PDFInfo
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Abstract
The invention discloses a slurry filling and water stopping method of a deep soil cement agitating pile in a confined water area. The method comprises the following steps: curtains are formed on a construction soil cement deep agitating pile around the water outflow points of a drill hole, the pile curtains are designed into two to four rows, and the pile rows are closely contacted; after the curtains are formed, a deep groove is excavated on the top of the pile, reinforced steel bars are evenly distributed in the groove and are bent towards the centre of the curtains, so as to form a radiated reinforced steel bar net, then concrete is poured to form a cover plate; the slurry pouring is performed in the curtains to solidify stratums; a valve of a flow guiding pipe is tried to be closed, when no infiltration outside the flow guiding pipe appears, the water stopping is completed. By adopting the method, the problem that the confined water outflows heavily can be effectively solved, the potential risk to the existing buildings possibly caused by the outflow can be eliminated, the water stopping effect is good, the construction is simple, and the method is easy to be carried out.
Description
Technical field the invention belongs to geotechnical investigation and construction technology in geotechnical engineering field, a kind of water-stop technology when being specifically related to water burst occur in artesian area's geotechnical investigation or the work progress.
When background technology is constructed in the artesian area,, must adopt an effective measure and carry out sealing the water burst disaster that may occur.Usually when handling the water burst disaster, generally adopt first pressure head (reduction water level) again shutoff get final product; Or adopt the round pool outside the well head pipe, dig certain depth under the Horizon, and successively insert clay or cement mortar, and jolt ramming is to the face of land, shutoff well head pipe blocks each exhalant canal then.But if the initial stage is dealt with improperly, particularly the face of land is a scall, and well head is damaged, and former well head is difficult to find, and underground water yield is bigger, so that become artesian water disease when regulation by general artesian water processing events, conventional sealing method for blocking is difficult to prove effective.
Summary of the invention the object of the present invention is to provide a kind of artesian area deep water earth agitation pile to add the slip casting water-stopping method, this method can effectively solve artesian area's water burst disease problem, and can eliminate the threat that may cause existing structure, realize rapidly the effectively purpose of sealing.
For achieving the above object, the technical scheme taked of the present invention is:
A kind of artesian area deep water earth agitation pile adds the slip casting water-stopping method, and this method may further comprise the steps:
(1) curtain construction: the cement soil deep agitation pile of constructing around the boring issue forms curtain, and the stake curtain is designed to two to four rows, and campshed is tangent closely;
(2) cover plate construction: after curtain forms, back down in stake and to dig a deep trouth, evenly lay reinforcing bar in the groove, and to the bending of curtain center, form radial steel mesh reinforcement, fluid concrete forms cover plate then, guarantee that pile crown closely is connected with concrete;
(3) carry out in the curtain slip casting and solidify the stratum: before the cast cover plate, in concrete cover, reserve Grouting Pipe, treat that cover plate reaches expection intensity after, punching slip casting adopts cement, single water glass liquid, biliquid or mixed liquid grout to solidify the soil body in the curtain;
(4) the mozzle valve is closed in examination, and when not having infiltration outside the mozzle, sealing is finished; If mozzle still has a small amount of infiltration outward, then deepen the water shutoff point;
(5) deepen the water shutoff point: but from mozzle the cement paste of extruding maximum pump concentration, in mozzle, during no water burst, close dead valve immediately, thereby reach the sealing purpose.
Infiltration still appears in further perfect as technique scheme after closing dead valve, then take on the cover board to punch once more slip casting, after closing valve, do not have infiltration or infiltration few till.
In the described curtain construction, take 2～3 multiple sprays to guarantee pile quality to the big superficial part location of pile influence.
In the described curtain construction, the stake footpath is Φ 400mm～800mm, and stake is long decides agitation pile cement mixed weight 150～240kg/m on water burst processing region stratum concrete condition
3, and press 2%～4% of cement weight and add fast coagulating early strength agent.
Slip casting is solidified in the construction of stratum in the described curtain, reserve on the cover board in the injected hole that to inject water/binder ratio be the cement paste of 1:0.5～0.8, the ratio by cement weight 2%～4% adds water glass simultaneously, with the soil body in the curing curtain, when grouting pressure reaches 1.5Mpa～2Mpa, stop slip casting.
In the construction of described intensification water shutoff point, the water of compaction gray scale is the cement paste of 1:0.5～1 in the mozzle.
Above-mentioned artesian area provided by the invention deep water earth agitation pile adds the slip casting water-stopping method, and fully water of hydration earth deep-mixed pile curtain adds the advantage of slip casting water-stop technology.The cement soil deep agitation pile at first is set, because the cutting stirring action of Mixing Machine makes soil structures destroy around issue, after admixing cement, to form the big and water stability of intensity cement stone district preferably, thereby form curtain, the lateral flow of prevention water.By the reservation Grouting Pipe in the cover plate, the cement paste of extruding high concentration makes the soil body compacted at the slip casting point, and forms " slurry bubble " near the Grouting Pipe end then.When slurry bubble is outwards expanded, will in the soil body, cause complicated radially with the shear stress system, with subject to severe risks of damage and shearing, and form the plastically deforming area near the soil body at slurry bubble place, this moment, soil structures was destroyed, what combine with cement paste is more abundant, increases soil strength; Elastic deformation takes place because of squeezing action in the syneresis bubble soil body far away, become more closely knit, increased and stake between interaction force, the water shutoff system that cement soil deep agitation pile, the soil body and cover plate are formed connects into integral body more closely, forms " a calculus body " that structure is new, intensity is big, water resistance is good and chemical stability is good.Deep water earth agitation pile provided by the invention adds the slip casting water-stopping method, through facts have proved: can solve effectively that artesian water is a large amount of outer to be gushed, and the elimination potential threat that existing structure are caused that may cause thus, stagnant water effect is good, and construction is simple, easy to implement the method.
Description of drawings Fig. 1 is for curtain pile of the present invention and reserve injected hole plan-position schematic diagram
Specific embodiment artesian area provided by the invention deep water earth agitation pile adds the slip casting water-stopping method, successfully is applied to the right 30m artesian water of western ruling K548+516 disease and speedily carries out rescue work in the emergency processing engineering.Increase in the process of building in lattice two wires, Qinghai-Tibet Railway west, because of needs must be worn one of overpass bridge under the k548+516 place sets up, when carrying out geological mapping, execute the rig group and when being drilled into underground 29.6m, expose the artesian aquifer top board at the bridge site place, the artesian water face of land that gushes out, water yield is about 5000m
3/ d and head pressure are big.In-situ processing unit once actively took measures, (operating personnel has extracted sleeve pipe in holing but because processing method is not proper, employing is pressed into the method for obstruction delivery ports such as the concrete stake and the lumps of wood and counts out from the aperture, reason is because the artesian water head pressure is big and top board is soft with overlying strata, be mainly mud matter silty clay and silty clay, near causing becoming around the boring by single water outlet in the hole phenomenon of water burst is arranged all, problem is very complicated.) fail shutoff successfully; and the underground water of constantly gushing out from the aperture; limited by site condition; it is not smooth to drain channel; converged on the existing railway right side and be the long strip type pool, the ponding volume will produce emollescence to existing railway roadbed body also in continuous expansion; the operation security of serious crisis Qinghai-Tibet Railway west lattice section existing railway and newly-increased two wires, character becomes the artesian water disease emergency processing engineering of speedily carrying out rescue work by artesian water shutoff processing events in the general hole.
By to artesian water disease worker point place nature geography characteristic, earth formation, hydrogeological conditions and early stage governance process and at present present situation etc. carried out intensive researching and analysing, comprehensive more multiple sealing scheme adopts cement soil deep agitation pile curtain to add the slip casting technology at last and has successfully solved this difficult problem.
Cement soil deep agitation pile curtain provided by the invention adds the slip casting water-stopping method, its main innovate point is as shown in Figure 1: promptly design the cement soil deep agitation pile and form curtain around issue, the integrative consolidation resolution of slip casting in curtain then, the stake curtain 1 be designed to two to four row and campshed tangent, after curtain pile forms, back down in stake and to dig a cannelure, evenly lay reinforcing bar, and, forming radial steel mesh reinforcement to the bending of curtain center, fluid concrete forms cover plate then, guaranteed that pile crown and concrete cover can closely link together, form the monolithic concrete cover plate, and before cast, in concrete cover, reserve Grouting Pipe 2, the punching slip casting of cast back, when not having infiltration in the center mozzle 3, close mozzle 3 valves, thereby reach the sealing purpose.
Concrete construction sequence is as follows:
First step curtain construction: dig out aqua region 30cm under before the construction, thin layer cement and bury drainage tube underground, concentrate and discharge underground water burst, be convenient to construction; Equipment and personnel march into the arena then, and Installation and Debugging equipment also carries out on-the-spot test pile, determine to adopt the dry sprayig process construction according to the test pile situation at last, and three campshed curtains are adopted in decision simultaneously, designing pile length 15m, spacing 0.5m, stake footpath Φ 500mm, curtain diameter 14m.In work progress, consider that 0～7m section ground disturbance is seriously big to the pile influence, therefore in this segment limit, take 3 multiple sprays to guarantee pile quality; After finishing a circle, for can make second circle and the 3rd circle interlock more closely, be more conducive to water shutoff, take second to enclose and the 3rd enclose the operation of crossed construction together; Agitation pile cement mixed weight 150kg/m
3, multiple spray section cement mixed weight 240kg/m
3, and take in cement, to add fast coagulating early strength agent to reach better effect, the adding proportion of fast coagulating early strength agent is 4% of a cement weight.
Second step cover plate construction: at first clear up about the empty pile crown 0.5m in top, remove curtain internal upper part earth and discarded charges.Do progressively each EXIT POINT of shutoff of 30～40cm base plate then earlier, guarantee that the construction of follow-up cover plate carries out under the environment of drying; Wait it to reach after certain intensity the cover plate of continuous pouring construction residual thickness again.Non-leakage for guaranteeing to close valve back shroud periphery, campshed stake top in the centre is picked out dark about 1 meter, the cannelure of wide about 0.45m, and by every 50cm spacing emphasis laying Φ 16mm reinforcing bar, and to the bending of curtain center, form the radial steel mesh reinforcement of Φ 16mm, cast C20 concrete cover, simultaneously cover plate is extended to the outsourcing pile crown, the about 15m of cover plate diameter, thick about 1m (cover sheet thickness generally needs to design according to the concrete condition of construction in scenes such as cement strength, head pressure).
The 3rd step was carried out slip casting curing stratum in the curtain: after waiting cover plate to reach expectation intensity, on the cover board reserve and make a call to 10 injected holes in the injected hole, injecting water/binder ratio is the cement paste of 1:0.5, the water glass that adds cement weight 4% simultaneously, solidify the soil body in the curtain, when grouting pressure reaches 1.6Mpa, stop slip casting.
The 4th step was closed the mozzle valve: at first the mozzle valve is closed in examination, because concrete cover plate intensity does not also reach design strength, compression resistance is not enough, also do not close when dead at valve, concrete capping 1/3rd places are promptly by pressure break, how high along the crack water 1m of emerging, the measure of slip casting so take on the cover board to punch once more, block little exhalant canal, thereby wider increase cover plate, stake and stratum interconnect area, make press water to the effect of cover plate concentrate on mozzle around, reduce the active force of artesian water to cover plate integral body.Carry out closing the second time valve then, at this moment, no longer leak though cover plate is handled the crack, back, but infiltration appears in the powder spray piling outside, opens valve immediately and excavate the rises to occur, finds to have the fracture of 6 piles, water spills from the crack, so preloading supercharging on the concrete cover plate when handling broken pile.Close valve when concrete condenses for the third time after reaching intensity, effect is very obvious, has only the minute quantity infiltration, and a day water yield is not more than 12m
3, only around mozzle, reach the local cracks place and ooze out.
The 5th step was deepened the water shutoff point: after the water of compaction gray scale is the about 5000kg of cement paste of 1:1 from mozzle, does not have water burst in the mozzle, and the suck-back phenomenon occurs, illustrate that cement paste is slowly sinking along exhalant canal, close dead valve immediately, all infiltrations stop.
Conclusion:
1. it is simple that deep water earth agitation pile curtain adds slip casting technology work progress, shorten the improvement cycle and reduced expense, successful assurance the normal operation of Qinghai-Tibet Railway west lattice section, a large amount of losses of Caidamu Basin groundwater resources have been avoided, just retrieve nearly 2,000,000 yuan of groundwater resources by water yield calculating half a year, obtained huge economic benefit.
2. successfully solved a large amount of outer the gushing of artesian water, and eliminated the potential threat that causes thus, guaranteed the unimpeded of Qinghai-Tibet Railway west lattice section, obtained the huge social benefit railway along the line.Water sealing operation has been finished more than a year now, and the test of having passed through the four seasons does not have artesian water to ooze out yet, and the effect of harnessing the river is fine.
3. because construction is simple and expense is low, this technology has good prospects for application in the artesian water of the highlands of awful weather, circumstance complication is administered, provide new improvement thinking for handling similar problem simultaneously.
Claims (6)
1. artesian area's deep water earth agitation pile adds the slip casting water-stopping method, it is characterized in that this method may further comprise the steps:
(1) curtain construction: the cement soil deep agitation pile of constructing around the boring issue forms curtain, and the stake curtain is designed to two to four rows, and campshed is tangent closely;
(2) cover plate construction: after curtain forms, back down in stake and to dig a deep trouth, evenly lay reinforcing bar in the groove, and to the bending of curtain center, form radial steel mesh reinforcement, fluid concrete forms cover plate then, guarantee that pile crown closely is connected with concrete;
(3) carry out in the curtain slip casting and solidify the stratum: before the cast cover plate, in concrete cover, reserve Grouting Pipe, treat that cover plate reaches expection intensity after, punching slip casting adopts cement, single water glass liquid, biliquid or mixed liquid grout to solidify the soil body in the curtain;
(4) the mozzle valve is closed in examination, and when not having infiltration outside the mozzle, sealing is finished; If mozzle still has a small amount of infiltration outward, then deepen the water shutoff point;
(5) deepen the water shutoff point: but from mozzle the cement paste of extruding maximum pump concentration, in mozzle, during no water burst, close dead valve immediately, thereby reach the sealing purpose.
2. artesian area according to claim 1 deep water earth agitation pile adds the slip casting water-stopping method, it is characterized in that infiltration still occurring after closing dead valve, then takes on the cover board to punch once more slip casting, till nothing infiltration or infiltration behind the valve of pass are few.
3. artesian area according to claim 1 deep water earth agitation pile adds the slip casting water-stopping method, it is characterized in that in the described curtain construction, takes 2～3 multiple sprays to guarantee pile quality to the big superficial part location of pile influence.
4. artesian area according to claim 1 deep water earth agitation pile adds the slip casting water-stopping method, it is characterized in that in the described curtain construction, the stake footpath is Φ 400mm～800mm, and stake is long decides agitation pile cement mixed weight 150～240kg/m on water burst processing region stratum concrete condition
3, and press 2%～4% of cement weight and add fast coagulating early strength agent.
5. artesian area according to claim 1 deep water earth agitation pile adds the slip casting water-stopping method, it is characterized in that slip casting is solidified in the construction of stratum in the described curtain, reserve on the cover board in the injected hole that to inject water/binder ratio be the cement paste of 1:0.5～0.8, ratio in cement weight 2%～4% adds water glass simultaneously, to solidify the soil body in the curtain, when grouting pressure reaches 1.5Mpa～2Mpa, stop slip casting.
6. artesian area according to claim 1 deep water earth agitation pile adds the slip casting water-stopping method, it is characterized in that in the construction of described intensification water shutoff point, and the water of compaction gray scale is the cement paste of 1:0.5～1 in the mozzle.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102155241A (en) * | 2011-05-10 | 2011-08-17 | 广州市城市规划勘测设计研究院 | Karst grouting reinforcement water-stop constructing method |
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| CN102606175A (en) * | 2012-03-12 | 2012-07-25 | 山东新阳能源有限公司 | Method for plugging confined water in underground coal mine sandstone crack |
| CN103498644A (en) * | 2013-09-29 | 2014-01-08 | 中国矿业大学 | Outburst prevention method in rock cross-cut coal uncovering and gas outburst coal seam double-curtain grouting |
| CN107227958B (en) * | 2017-07-25 | 2023-07-04 | 马钢(集团)控股有限公司 | Well wall structure of vertical well neck section high-spraying curtain pile, construction device and construction method |
| CN107246267B (en) * | 2017-07-25 | 2023-07-04 | 马钢(集团)控股有限公司 | Vertical shaft wall structure in bad stratum, construction device and construction method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102155241A (en) * | 2011-05-10 | 2011-08-17 | 广州市城市规划勘测设计研究院 | Karst grouting reinforcement water-stop constructing method |
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