CN105780793A - Emergency treatment method for sudden gushing of high confined water stratum foundation pit - Google Patents
Emergency treatment method for sudden gushing of high confined water stratum foundation pit Download PDFInfo
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- CN105780793A CN105780793A CN201610208832.1A CN201610208832A CN105780793A CN 105780793 A CN105780793 A CN 105780793A CN 201610208832 A CN201610208832 A CN 201610208832A CN 105780793 A CN105780793 A CN 105780793A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
Abstract
The invention discloses an emergency treatment method for sudden gushing of a high confined water stratum foundation pit. The method is characterized by comprising the steps that the water gushing condition is proved, a steel casing is arranged on the water gushing point in a covering manner to serve as an energy-releasing relief well, a simple back pressure platform is arranged at the bottom of the steel casing, the height of the steel casing should be 1 m above the static water level, water gushing kinetic energy can be guided into the steel casing, then, the water head pressure is released, and the water level in the steel casing depends on the pressure difference to be balanced; and meanwhile, the top face of the casing is sealed, communication of internal gas pressure and external gas pressure of the casing is prevented, the backpressure backfilling sealing grouting condition is simulated, a WSS double-tube non-shrinkage two-fluid grouting technology is adopted for carrying out advancing type segmented grouting, and therefore the aims of rapidly controlling water gushing of the foundation pit and reducing the risks of the foundation pit are achieved. According to the method, the number of emergency treatment materials and machine tools is small, the source is convenient, a construction technology is simple, the workload is small, and the construction cost is low; the emergency treatment time is short, and the dangerous omen can be rapidly controlled; and the method is suitable for treating water gushing of the foundation pit in various foundation pit excavation processes, and is particularly best in sudden gushing treatment effect of the high confined water head stratum foundation pit.
Description
Technical field
The present invention relates to a kind of underground structure, the especially processing method of high artesian stratum Foundation Pit Pouring water.
Background technology
Nanning rail transit Line 2 engineering, when building way station station main body foundation ditch 6～7 axle, is excavated to broke-out diseases during more than design of foundation pit bottom surface absolute altitude about about 1m, and water yield reaches about 300/h.This section of station main body design of foundation pit cutting depth 17.817m, mainly passes through silty, and substrate is underlied middle air slaking breccia.Silty is half diagenesis being consolidated into rock-like, and core major part is in column, and rock matter is softer, hammering celostomia, and continuous-stable is distributed, for impermeable stratum.Middle air slaking breccia is formed by argillaceous siltstoue, limestone and marl are cementing, rock crushing, and core major part is block in rubble, a small amount of short cylinder, developmental joint fissure, and karst water enriches, and water penetration is strong, belongs to high artesian, artesian head about 8-10m.After analysis project geology and hydrogeology data, the reason of station pit broke-out diseases is ground cytoplasmic mutation, the middle air slaking breccia generation local crowning that i.e. substrate is underlied, and it is bigger to compose the artesian water head pressure deposited in dust rock stratum, excavation along with foundation ditch, foundation ditch bottom impermeable stratum thickness is more and more thinner, when under excavation face, the deadweight of impermeable stratum and adhesion strength are less than bottom artesian water head pressure, artesian water head pressure bursting hole end impermeable stratum generation Foundation Pit Pouring.Similar stratum Foundation Pit Pouring water was the most repeatedly run in other engineering construction.
Currently for the processing method of foundation ditch retention of excessive fluid, main by Foundation Pit Pouring Stability Checking in advance, before the design and excavation of foundation pit of foundation pit enclosure and water sealing structure, precipitation is solved；For the emergency processing method of broke-out diseases, main employing backfill back-pressure, slip casting block, mend the modes such as well precipitation and combinations thereof mode.These Tunnel gushing treatment methods, are respectively arranged with its pluses and minuses.
Handle before happening is main Foundation Pit Pouring processing mode, compares the most comprehensively engineering for engineering geology with hydrogeologic data grasp, by foundation pit enclosure water sealing structure the most reliably, or base pit dewatering, substantially can avoid generation Foundation Pit Pouring.But the deficiency due to ground cytoplasmic mutation, recognized stratum artesian water, geological mapping borehole sealing is bad, unreasonable, the implementation result of the water-stop curtains such as diaphragm wall, interlocking pile, rotary churning pile or dewatering design the best, and the disturbance that excavation of foundation pit is to stratum, it is likely to cause broke-out diseases after excavation of foundation pit, the risk of Foundation Pit Pouring can not be evaded completely.Once Foundation Pit Pouring, it is necessary to carry out emergency processing immediately.
Backfill back-pressure is that modal dashing forward gushes emergency processing method; its technological principle is that retention of excessive fluid initial stage issue and neighboring area heap thereof in foundation ditch presses sand pocket, earth bag and back-pressure of banketing; while weakening water yield; prevent retention of excessive fluid from flowing out with sand grains; guarantee deep pit monitor; tamp substrate substantially without in the case of substantially shoving to foundation ditch internal drilling slip casting closure level of ground water to certain depth under substrate, or cheat outer complement dewatering well lowering of watertable to certain depth under substrate, excavation of foundation pit can be re-started.The advantage of the method is that water blockoff is fast, can implement immediately, shortcoming be backfill and secondary excavation workload big, and can not fundamentally solve Foundation Pit Pouring problem, it is necessary to combine slip casting or mend well precipitation and just can prevent that secondary is prominent to be gushed.Although and slip casting closure the duration short, but shortcoming is effect be not easy ensure, particularly with high artesian；The advantage mending well precipitation is effective, but long in time limit, and well location selects easily to be restricted, and displacement is big, is unfavorable for protecting groundwater resources, and huge discharge precipitation easily causes surrounding formations to settle, produce secondary disaster.
In view of this, find that a kind of duration is short, instant effect, low cost, safe and reliable Foundation Pit Pouring emergency processing method, particularly with high artesian stratum, problem in the urgent need to address during with regard to becoming Foundation Pit Pouring.
Summary of the invention
For the emergency processing of high artesian stratum Foundation Pit Pouring, owing to artesian head pressure is big, backfill back-pressure quantities is very big, and scene may not have a large amount of sand pocket, and the method must be aided with slip casting closure or mend well precipitation.Slip casting closure just can must be carried out in the case of the most substantially shoving, and otherwise, grouting serous fluid dilution of being shoved is run off, and it is the most long in time limit to mend well precipitation, is especially limited by site condition, issue periphery can well spacing, by strong influence dewatering effect.Accordingly, it is capable to no on the premise of not complement dewatering well precipitation, on the one hand can reduce issue artesian water head pressure, and not backfill back-pressure, or backfill back-pressure less；On the other hand, foundation ditch is created without the condition substantially shoved, in order to slip casting blocks；Additionally, choose rational ejection for water plugging technique, it is ensured that the effect of closure, these are all the key technical problems needing to solve.
It is an object of the invention to provide that a kind of duration is short, instant effect, low cost and safe and reliable high artesian stratum Foundation Pit Pouring emergency processing method.
For reaching above-mentioned purpose, the technical scheme is that
A kind of high artesian stratum Foundation Pit Pouring emergency processing method, it is characterised in that comprise the following steps:
(1), verify retention of excessive fluid situation, accurately verify the position of retention of excessive fluid, the distribution of issue, the retention of excessive fluid correlation circumstance of water yield size；
(2), issue upper cover set steel pile casting, according to the retention of excessive fluid situation verified, set the steel pile casting more than issue in issue upper cover；Steel pile casting bottom is provided with discharge opening and installs valve, also serves as inspection socket, in order to releases and can reduce pressure and subsequent operation；
(3), back-pressure platform is set, after steel pile casting covers in issue, for fixing steel pile casting, the rapid landfill of steel pile casting exterior bottom periphery a small amount of sand pocket formation back-pressure platform bottom steel pile casting；Meanwhile, the discharge opening draining of steel pile casting bottom is on the one hand opened；On the other hand, arranging suction pump in steel pile casting and strengthen draining, the pump delivery that draws water should be greater than water yield, discharges artesian head pressure, and reducing dashes forward gushes the impact to casing bottom periphery；After steel pile casting bottom periphery is without substantially shoving, outside back-pressure platform sand pocket, hangs reinforced mesh and casting concrete constitutes armored concrete confining bed；
(4), connect high steel pile casting, realize releasing the purpose that can reduce pressure for reaching steel pile casting, after first paragraph steel pile casting fixes, along with the rising of retention of excessive fluid position, connect high steel pile casting piecemeal, until the above 1m of static level；Then removing pumping equipment in steel pile casting, stop steel pile casting draining, in steel pile casting, water level relies on pressure balance, creates hydrostatic execution conditions；
(5), closing steel pile casting, after steel pile casting height meets requirement, steel pile casting end face uses steel plate to close welding, and weld seam should be the most closely knit, prevents casing inner and outer air pressure from connecting, and creates closing slip casting condition, prevents serosity from rising with liquid level in cylinder and leaking；
(6), slip casting closure, in the present situation excavation face of steel pile casting and sand pocket periphery, retention of excessive fluid fracture belt or substrate weak area scope extend out more than 2m, bore multiple injected hole；The layout of injected hole is according to slip casting effective range, and should be overlapped, make to be reinforced the soil body in plane and depth bounds, be linked to be what an overall principle determined, pattern uses 2m × 2m blossom type cloth hole, the degree of depth is no less than 5m to the absolute altitude of foundation ditch bottom surface, and concrete grouting and reinforcing impermeable layer thickness should be not determined for principle by substrate artesian head bursting；Use WSS double pipe ungauged regions two fluid grouting technique to carry out protrusive slip casting by injected hole, inject closure serosity and build grouting and reinforcing water barrier.Grouting sequence ecto-entad, advances to issue from periphery, and grouting pressure controls 2～3 times at retention of excessive fluid pressure, and serosity controls at 30s setting time；
(7), water plugging effect inspection, after water barrier is set up in slip casting, to idle running district, i.e. foundation ditch residue soil layer carries out core detection, in order to make comparisons slip casting closure water proof effect definite evaluation, it is judged that whether slip casting water barrier reaches requirement；
(8), excavation of foundation pit, through core detection, evaluate and judge water barrier effect inspection, after confirming that slip casting closure water proof meets and requires, the discharge opening opening steel pile casting discharges water, and observes and has without exception, can recover excavation of foundation pit if without exception.
The present invention use high artesian stratum foundation ditch retention of excessive fluid steel pile casting release can reduce pressure+advantage of emergency processing method of slip casting closure is as follows:
(1) emergency processing material is few with facility, convenient sources, construction technology are simple, workload is few, construction cost is low.On-the-spot needs standby a small amount of sand pocket, steel pile casting and water pump, it is not necessary to employs a large amount of personnel and facility, just can control retention of excessive fluid, it is to avoid produces big foundation ditch risk；
(2) the emergency processing time is short, can control the dangerous circumstances rapidly.Owing to using steel pile casting to release the mode look-ahead retention of excessive fluid that can reduce pressure, it is to avoid substantial amounts of foundation ditch backfills back-pressure, workload is few and to process the time short；Simultaneously, it is to avoid mend the well location selection restriction suffered by well precipitation separately, long in time limit, displacement big, be unfavorable for fwaater resources protection and thus produces the risk of surrounding enviroment secondary disaster etc.；
(3) high treating effect.Use steel pile casting release can reduce pressure+slip casting block mode, first control and control afterwards, two combine, and treatment effect intuitively can be sentenced, and steel pile casting can also serve as water level observation well, it is to avoid process not in place and back and forth.
Accompanying drawing explanation
Fig. 1 is the structural representation that the present invention implements；
In the drawings, sand pocket 1, reinforced mesh concrete enclosing layer 2, sealing plate 3, static level absolute altitude 4, steel pile casting 5, discharge opening 6, present situation excavation face 7, foundation ditch bottom surface absolute altitude 8, injected hole 9, issue 10, grouting and reinforcing water barrier 11, idle running district 12.
Detailed description of the invention
Below in conjunction with the accompanying drawings, the invention will be further described.
Shown in Fig. 1, it is the structural representation implemented of the present invention, as can be seen from FIG., when Excavation Process runs into high pressure-bearing issue 10, for reducing artesian water head, and don't performs dewatering well, use for reference the principle of relief well in dewatering project；Meanwhile, for controlling rapidly retention of excessive fluid, it is to avoid retention of excessive fluid floods foundation ditch, can directly issue arrange steel pile casting as release can relief well, create foundation ditch without the execution conditions substantially shoved be convenient for slip casting closure.According to this emergency processing thinking, high artesian stratum Foundation Pit Pouring emergency processing method comprises the following steps:
(1), verify retention of excessive fluid situation, accurately verify the position of retention of excessive fluid, the distribution of issue 10, the retention of excessive fluid correlation circumstance of water yield size；
(2), issue upper cover set steel pile casting, according to the retention of excessive fluid situation verified, steel pile casting 5 is set at issue 10, steel pile casting 5 can use steel pipe, it would however also be possible to employ Plate Welding becomes water tank.The diameter of steel pile casting 5 should be greater than the distribution of issue, and not less than 1m；Meanwhile, steel pile casting 5 bottom is reserved discharge opening 6 and installs valve, also serves as inspection socket, in order to releases and can reduce pressure and subsequent operation；
(3), setting back-pressure platform bottom steel pile casting, after steel pile casting 5 covers in issue 10, for fixing steel pile casting 5, a small amount of sand pocket of the rapid landfill of steel pile casting exterior bottom periphery 1 forms back-pressure platform.Meanwhile, discharge opening 6 draining of steel pile casting bottom is on the one hand opened；On the other hand, arranging suction pump in steel pile casting 5 and strengthen draining, the pump delivery that draws water should be greater than water yield, discharges artesian head pressure, and reducing dashes forward gushes the impact to casing bottom periphery；Sand pocket 1 back-pressure is fixed, until after steel pile casting bottom periphery is without substantially shoving, hangs reinforced mesh at steel pile casting bottom periphery parcel sand pocket 1 and steel pile casting 5 and pours a concrete layer 2 and close.The purpose of pouring reinforcement concrete confining bed 2 is partly in order to confining surface, it is to avoid seep water, fixing steel pile casting 5, prevents grouting pressure from making platform swell；On the other hand it is to disclosure satisfy that the requirement closing slip casting when hydrostatic slip casting；
(4), high steel pile casting is connect, can realize releasing the purpose that can reduce pressure for reaching steel pile casting 5, after first paragraph steel pile casting fixes, along with the rising of retention of excessive fluid position, connect high steel pile casting piecemeal, until the above 1m of static level, then pumping equipment in steel pile casting 5 is removed, stopping steel pile casting draining, in steel pile casting, water level relies on pressure balance, creates hydrostatic execution conditions.To this end, should weld closely knit between every section of steel pile casting, prevent from leaking；
(5), closing steel pile casting, after steel pile casting 5 highly meets requirement, steel pile casting 5 is used above steel plate 3 and seals welding, weld seam should be the most closely knit, sealing steel plate 3 can prevent casing inner and outer air pressure from connecting, and creates and closes slip casting condition, prevents serosity from rising with liquid level in cylinder and leaking；
(6), slip casting closure, in the present situation excavation face 7 of steel pile casting 6 and sand pocket 1 periphery, retention of excessive fluid fracture belt or substrate weak area scope extend out more than 2m, pass through downwards foundation ditch residue soil layer i.e. idle running district 12, foundation ditch residue soil layer interval bore multiple injected holes 9.Wherein, the i.e. foundation ditch in idle running district residue soil layer.The layout of injected hole 9 is according to slip casting effective range, and should be overlapped, make to be reinforced the soil body in plane and depth bounds, be linked to be what an overall principle determined, pattern uses 2m × 2m blossom type cloth hole, the degree of depth is to foundation ditch bottom surface absolute altitude less than 8 no less than 5m, and concrete grouting and reinforcing water barrier 11 thickness should be not determined for principle by substrate artesian head bursting.
Using WSS double pipe ungauged regions two fluid grouting technique to carry out protrusive slip casting by injected hole 9, inject closure serosity from each injected hole 9 and build grouting and reinforcing water barrier 11, it has the effect of quick sealing and soil stabilization.Grouting sequence ecto-entad, advances to issue 10 from periphery, and grouting pressure controls 2～3 times at retention of excessive fluid pressure.
Closure serosity divides solution-type (A, B liquid) and two kinds of suspended type (A, C liquid).Injecting paste material A liquid uses 30Be ' waterglass, and B liquid is made up of acid and additive；C liquid uses P.O42.5 ordinary cement serosity, and the ratio of mud is 1:1, and mixes a certain amount of additive, and serosity controls at 30s setting time, and grout coordinate ratio is as follows:
WSS double pipe ungauged regions two fluid grouting construction proportioning list
WSS double pipe ungauged regions two fluid grouting technique uses double pipe to bore note, and integrally drill hole of drilling machine is to desired depth or place, by the direct slip casting of double pipe drilling rod.If water yield is very big, take protrusive segmenting slip casting construction method, implement to bore one section, note one section, then bore one section, the brill of note one section, note over-over mode carry out bored grouting construction again.A, B liquid or A, C liquid are sufficiently mixed by the slurry mixer of double pipe drilling rod termination, in the case of unchanged layer forms, the water existed between formation particles is forced extrusion, void among particles is made to be full of serosity, and consolidate the purpose reaching to improve soil layer character, after particulate interspaces is filled with the serosity not flowed and consolidate, soil layer water penetration is made to reduce, and form relative water resisting layer 11, as shown in diagonal line, the thickness of grouting and reinforcing water barrier 11 should be not determined for principle by substrate artesian head bursting；
(7), water plugging effect inspection, after water barrier 11 is set up in slip casting, idle running district 12 is carried out core detection, in order to slip casting closure water proof effect is made comparisons definite evaluation, it is judged that whether slip casting water barrier reaches requirement；
Drill hole sampling quantity is not less than the 3% of slip casting hole count, and no less than 3, cloth hole it is important that the bad location of geological conditions and grouting quality is poor or injected hole arranges more difficult position, drilling depth is to substrate elevation location.Pass through drill hole sampling, original state sample is taken out in injecting cement paste, and send test chamber detection to obtain several the important physical and mechanical property indexs (density, set strength, slurry pack completeness, residual pore rate, permeability, unconfined compressive strength) of sample, and observe tube sample boring with or without appreciable current, it is judged that whether slip casting closure reaches requirement；
(8), excavation of foundation pit, through core detection, evaluate and judge water plugging effect inspection, after confirming that slip casting closure meets and requires, the discharge opening opening steel pile casting discharges water, and observes and has without exception, can recover excavation of foundation pit if without exception.
The present invention is through repeatedly putting into practice, and in the Foundation Pit Pouring emergency processing of high artesian stratum, effect is notable, have accumulated invaluable experience for processing stratum Foundation Pit Pouring water from now in engineering construction.
Claims (9)
1. a high artesian stratum Foundation Pit Pouring emergency processing method, it is characterised in that comprise the following steps:
(1), verify retention of excessive fluid situation, accurately verify the position of retention of excessive fluid, the distribution of issue, the retention of excessive fluid correlation circumstance of water yield size；
(2), issue upper cover set steel pile casting, according to the retention of excessive fluid situation verified, set the steel pile casting more than issue in issue upper cover；Steel pile casting bottom is provided with discharge opening and installs valve, also serves as inspection socket, in order to releases and can reduce pressure and subsequent operation；
(3), back-pressure platform is set, after steel pile casting covers in issue, for fixing steel pile casting, the rapid landfill of steel pile casting exterior bottom periphery a small amount of sand pocket formation back-pressure platform bottom steel pile casting；Meanwhile, the discharge opening draining of steel pile casting bottom is on the one hand opened；On the other hand, arranging suction pump in steel pile casting and strengthen draining, the pump delivery that draws water should be greater than water yield, discharges artesian head pressure, and reducing dashes forward gushes the impact to casing bottom periphery；After steel pile casting bottom periphery is without substantially shoving, outside back-pressure platform sand pocket, hangs reinforced mesh and casting concrete constitutes armored concrete confining bed；
(4), connect high steel pile casting, realize releasing the purpose that can reduce pressure for reaching steel pile casting, after first paragraph steel pile casting fixes, along with the rising of retention of excessive fluid position, connect high steel pile casting piecemeal, until the above 1m of static level；Then removing pumping equipment in steel pile casting, stop steel pile casting draining, in steel pile casting, water level relies on pressure balance, creates hydrostatic execution conditions；
(5), closing steel pile casting, after steel pile casting height meets requirement, steel pile casting end face uses steel plate to close welding, and weld seam should be the most closely knit, prevents casing inner and outer air pressure from connecting, and creates closing slip casting condition, prevents serosity from rising with liquid level in cylinder and leaking；
(6), slip casting closure, in the present situation excavation face of steel pile casting and sand pocket periphery, retention of excessive fluid fracture belt or substrate weak area scope extend out more than 2m, bore multiple injected hole；Use WSS double pipe ungauged regions two fluid grouting technique to carry out protrusive slip casting by injected hole, inject closure serosity and build grouting and reinforcing water barrier；Grouting sequence ecto-entad, advances to issue from periphery, and grouting pressure controls 2～3 times at retention of excessive fluid pressure, and serosity controls at 30s setting time；
(7), water plugging effect inspection, after water barrier is set up in slip casting, water barrier is carried out core detection, in order to slip casting closure water proof effect is made comparisons definite evaluation, it is judged that whether slip casting water barrier reaches requirement；
(8), excavation of foundation pit, through core detection, evaluate and judge water barrier effect inspection, after confirming that slip casting closure water proof meets and requires, the discharge opening opening steel pile casting discharges water, and observes and has without exception, can recover excavation of foundation pit if without exception.
Emergency processing method the most according to claim 1, it is characterised in that:
Described issue upper cover sets steel pile casting, should arrange steel pile casting according to the retention of excessive fluid situation verified at issue, and steel pile casting can use steel pipe, it would however also be possible to employ Plate Welding becomes water tank.The diameter of steel pile casting should be greater than the distribution of issue, and not less than 1m；Meanwhile, steel pile casting bottom is reserved discharge opening and installs valve, also serves as inspection socket, in order to releases and can reduce pressure and subsequent operation；Steel pile casting is alternatively arranged as water level observation well, it is to avoid process not in place and back and forth.
Emergency processing method the most according to claim 1, it is characterised in that:
Fixing of described steel pile casting, uses the steel pile casting exterior bottom periphery a small amount of sand pocket of rapid landfill to form back-pressure platform, and hangs reinforced mesh casting concrete composition armored concrete confining bed outside back-pressure platform sand pocket.So can not only fix steel pile casting, the problem solving steel pile casting bottom periphery seepage, and steel pile casting bottom periphery tentatively can be reinforced, so as to bear the grouting pressure of follow-up slip casting closure.
Emergency processing method the most according to claim 1, it is characterised in that:
Described releasing, for realizing steel pile casting, the purpose that can reduce pressure, connect high steel pile casting to the above 1m of static level, in steel pile casting, water level relies on pressure balance.Use steel pile casting to release the mode that can reduce pressure can to reduce rapidly issue artesian water head pressure, and do not backfill back-pressure, or backfill back-pressure less on the premise of not beating dewatering well precipitation with look-ahead retention of excessive fluid.For high artesian head, it is to avoid the backfill of substantial amounts of foundation ditch, workload is few and the emergency processing time is short, can control the dangerous circumstances rapidly.
Emergency processing method the most according to claim 1, it is characterised in that:
Described steel pile casting end face uses steel plate to close welding, weld seam should be the most closely knit, prevents casing inner and outer air pressure from connecting, simulation backfill back-pressure operating mode, create and close mortar depositing construction condition, prevent serosity from rising with liquid level in cylinder and leaking, in order to carry out closing slip casting closure, thus reach to control rapidly foundation ditch retention of excessive fluid, reduce foundation ditch risk, and then closure water gushing channelway, reinforce soil mass of foundation pit, it is to avoid the generation again of Foundation Pit Pouring.
Emergency processing method the most according to claim 1, it is characterised in that:
The layout of described injected hole is according to slip casting effective range, and should be overlapped, make to be reinforced the soil body in plane and depth bounds, be linked to be what an overall principle determined, pattern uses 2m × 2m blossom type cloth hole, the degree of depth is no less than 5m to the absolute altitude of foundation ditch bottom surface, and concrete grouting and reinforcing impermeable layer thickness should be not determined for principle by substrate artesian head bursting.
Emergency processing method the most according to claim 1, it is characterised in that:
Described slip casting plugging technology uses WSS double pipe ungauged regions two fluid grouting technique to carry out protrusive segmenting slip casting.By double pipe brill note one drill hole of drilling machine to desired depth or place, the direct slip casting of double pipe drilling rod.If water yield is very big, implement to bore one section, note one section, then bore one section, the brill of note one section, note over-over mode carry out bored grouting construction again.Grouting sequence ecto-entad, advances to issue from periphery, and grouting pressure controls 2～3 times at retention of excessive fluid pressure.
Emergency processing method the most according to claim 1, it is characterised in that:
Described grouting serous fluid has solution-type and two kinds of suspended type, solution-type i.e. A, B liquid, suspended type i.e. A, C liquid.A liquid uses 30Be ' waterglass, and B liquid is made up of acid and additive；C liquid uses P.O42.5 ordinary cement serosity, and the ratio of mud is 1:1, and mixes a certain amount of additive, and serosity controls at 30s setting time.A, B liquid or A, C liquid are sufficiently mixed by the slurry mixer of double pipe drilling rod termination by 1:1 consumption, in the case of unchanged layer forms, the water existed between formation particles is forced extrusion, void among particles is made to be full of serosity, and consolidate the purpose reaching to improve soil layer character, after particulate interspaces is filled with the serosity not flowed and consolidate, make soil layer water penetration reduce, and forming relative water resisting layer, the thickness of grouting and reinforcing water barrier should be not determined for principle by substrate artesian head bursting.
Emergency processing method the most according to claim 1, it is characterised in that:
Described water plugging effect inspection, is after water barrier is set up in slip casting, and idle running district is carried out core detection, in order to definite evaluation of making comparisons slip casting closure water proof effect, it is judged that whether slip casting water barrier reaches requirement；Drill hole sampling quantity is not less than the 3% of slip casting hole count, and no less than 3, cloth hole it is important that the bad location of geological conditions and grouting quality is poor or injected hole arranges more difficult position, drilling depth is to substrate elevation location.Through core detection, evaluating and judge water plugging effect inspection, after confirming that slip casting closure meets requirement, the discharge opening opening steel pile casting discharges water, and observation has without exception, can recover excavation of foundation pit if without exception.
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| CN114150686B (en) * | 2021-10-26 | 2023-02-07 | 中国铁工投资建设集团有限公司 | Deep foundation pit plugging device and application method thereof |
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