A kind of sealing agent and its application method for foundation pit campshed enclosure wallTechnical field
The present invention relates to building material technical fields, more specifically to a kind of leak stopping for foundation pit campshed enclosure wallAgent and its application method.
Background technique
In recent years, urbanization process quickening promotes skyscraper and Underground Rail Transit demand to increase, and foundation pit is more diggingDeep, the utilization of the underground space is more and more abundant.Deep basal pit belongs to the biggish part-to-item project of risk, retaining design relationshipTo the safety of entire excavation of foundation pit.Currently, the common deep foundation pit support form in China has campshed (bored concrete pile, deep-mixed pile) branchShield, diaphram wall, steel sheet pile enclosure structure, the forms such as SMW.In numerous deep footing groove enclosing structures, campshed supporting constructionTechnical maturity, project cost is reasonable, and support form multiplicity is used widely in China.However, in some Engineering Projects,Due to reconnoitre, design it is improper cause a spacing excessive or Excavation Process in Yield rainfall relation improper measures, and by the hydrology,Geology, rainy season in winter etc., factor complicated and changeable influenced, and often occurred the phenomenon that leak, quicksand and piping between stake, once outside campshedSide severe water and soil erosion will cause engineering accident, schedule delays.
When building enclosure infiltration, the form of bored grouting is mostly used to block seepage point in engineering, but for water yieldThe effect of biggish leakage point, bored grouting is poor.Therefore, it for the leakage point of larger size (100mm-300mm), improves and boresThe effect of hole grouting for water plugging has engineering significance.
Common bored grouting material is sealing agent, mainly there is three classes: quick-hardening cement, portland cement-waterglass biliquid notePulp material and organic aquation expanding material.Chinese patent CN201810478699 disclose it is a kind of by sulphoaluminate cement clinker,The sealing agent of cement clinker and macromolecule hydration swelling material composition, although the sealing agent rate of set is fast, valenceLattice are expensive and preparation of construction is complicated.Portland cement-silicate double solution grouting material condensation setting rate is fast, the rapid sealing of energy, butPortland cement is reacted with waterglass also generates a large amount of Na (OH) while generating hydrated calcium silicate2, Na (OH)2Easily by undergroundWater is dissolved out, and Behavior of Hardened Cement Paste durability is caused to decline, and building enclosure may seep water again.In addition, sealing agent on the market is also depositedIt is low in intensity, the bad disadvantage with the goodness of fit of basal plane.
Summary of the invention
In order to overcome above-mentioned defect existing in the prior art and deficiency, the present invention provides one kind to enclose for foundation pit campshedThe sealing agent of revetment, goal of the invention of the invention are that the intensity for solving sealing agent in the prior art is low, price is high, kiss with basal planeRight bad disadvantage；The present invention provides a kind of cheap, excellent durability sealing agents.
In order to solve above-mentioned problems of the prior art, the present invention is achieved through the following technical solutions:
A kind of sealing agent for foundation pit campshed enclosure wall, it is characterised in that: including following raw material by mass percentage:
Aluminate cement clinker 50 ~ 64%；Aluminate cement clinker basicity factor 0.85 ~ 0.9, calcium aluminate than coefficient 2.5 ~ 3.0,C2AS content is less than 25%；500 ~ 600m of aluminate cement clinker specific surface area2/kg；
Anhydrite 6 ~ 10%, anhydrite specific surface area are greater than 500m2/kg；
Stalk fibre 2-16%, stalk fibre length < 3mm；
Bentonite 4 ~ 16%；
Walnut shell bits 12 ~ 20%, walnut shell consider 0.15mm standard screen screen over-size to be worth doing less than 25%.
The stalk be one of rice straw, wheat stalk, broomcorn straw, rape stalk, cotton stalk,
The bentonite is sodium bentonite, and wherein smectite content is greater than 90%.
The sealing agent meets following index: the presetting period is no earlier than 5min, and final setting time must not be later than 30min；1h is strongDegree is not less than 5MPa, and 2h is not less than 13MPa, and 28d intensity is not less than 45MPa.
The sealing agent performance indicator is tested referring to GB23440-2009 " inorganic leak-stopping material ".
It is provided by the invention stifled the present invention also provides a kind of application method of sealing agent for foundation pit campshed enclosure wallThe goal of the invention for leaking the application method of agent is to solve foundation pit campshed supporting leak crack and/or the larger (100mm- of holeWhen 300mm), the problem of simple bridge joint plugging material and cement injection are unable to satisfy leak stopping demand, sealing agent of the inventionApplication method, constructing operation is simple, does not increase project amount and construction machinery, and leak stopping is at low cost；In addition, walnut bits and staple fiber are logicalIt crosses " bridge formation ", blocking and insertion, diafiltration and " card larynx " to act on, hinders the outflow of sealing agent, plugging effect significantly improves.
In order to solve above-mentioned problems of the prior art, the present invention is achieved through the following technical solutions:
A kind of application method of the sealing agent for foundation pit campshed enclosure wall, it is characterised in that: the following steps are included:
Step A cleans out the clod of leak discharge surface and stone, leak chisels is big at outer openings, inside opening is smallFunnel-form scupper；Meanwhile loading clod and/or stone are spare in gunnysack；
Step B fills in scupper after the rope made of hemp limit and the fluffy processing of cotton limit mixing in 200-1000mm length rangeIn；
Step C, after filling in fiber, scupper is blocked with the gunnysack equipped with stone and/or soil；
Step D, using the axle center of scupper as the center of circle, on the circular arc that radius is 500-1000mm, at least four is symmetrically opened upInclined hole, the axis of inclined hole and the axis of scupper are in 45 ° of angles, aperture 25mm-35mm, and inclined hole is connected to scupper, InHigh pressure pouring pipe is installed in inclined hole, the sealing agent is perfused into scupper by high pressure pouring pipe；
Step E, slurry and slip casting are prepared, according to sealing agent: water=1:0.7 ~ 0.9 mass ratio prepares slurry, logical with high-pressure grout injectorIt crosses high pressure intrusion pipe sealing agent is pressed into scupper, completes leak stopping processing.
Compared with prior art, technical effect beneficial brought by the present invention is shown:
1, the aluminate cement clinker setting time that the present invention uses is short, and hour intensity is high, suitable for the preparation of sealing agent, but itsThe product CAH formed after aquation10And C2AH8, C can be changed under certain temperature and damp condition3AH6, crystal phase transition causesPetrifying water mudstone volume change causes intensity to decline.In order to avoid the reduction of leak stopping slurry later strength, there is the case where leaking again, InAnhydrite, anhydrite and aluminium mineral material (CA, CA are mixed in sealing agent2) reaction generation acicular crystal entringite (AFt), with aluminiumThe water mudrock structure that glue weave in is formed is fine and close, and intensity will not retraction.But excessive anhydrite can cause hardened cementStone late expansion, causes structure crack, so anhydrite should have a moderate dosage.
2, the basicity factor of aluminate cement clinker refers to forming monocalcium aluminate (CA) and calcium dialuminate in clinker(CA2) CaO amount required when all CA of calcium aluminate in CaO amount and clinker.Basicity factor is higher, and the CA amount in clinker that represents is got overMore, aluminate cement hardening is rapider, but CA content is too high, and intensity concentrates on early stage, institute unobvious to later strength enhancement rateConcentrating on 0.85 ~ 0.9 with basicity factor is more suitable for.
3, calcium aluminate is the ratio between CA and CA2 content in clinker than coefficient, and calcium aluminate is higher than coefficient, and early strength is higher,But clinkersintering temperature range is narrower；This is lower than coefficient for aluminic acid, and early strength is low, but sintering range is wide.Comprehensively consider aluminic acidCalcium is 2.5-3.0 than coefficient.And C2AS mineral do not have the hydraulicity in aluminate clinker, and inertia is presented in water, so to limitIts content.
4, the aluminate cement clinker and anhydrite specific surface area that the present invention uses are greater than 500m2/ Kg can both to block upLeakage agent obtains higher early strength, but also can avoid increasing the later period dangerous expansion of tool, leads to the wind of structure crackDanger.
5, staple fiber (length < 3mm) is added in sealing agent, Behavior of Hardened Cement Paste anti-bending strength not only can be improved, but also can leak" lacing wire ", " bridging " at water improve plugging effect.The application middle short fiber length < 3mm, can be to avoid use of time plugging feelingsThe appearance of condition.Common fiber has steel fibre, polymer fiber or glass fibre.Cementitious material is aluminic acid in this sealing agentSalt cement clinker, basicity is low after aquation, and steel fibre cannot form passivating film, and corrosion expansion is easy to appear at leakage point, is causedLeakage stop cracking；And polymer fiber and glass fibre production technology are both not environmentally or uneconomical.Stalk fibre with above-mentioned three kindsStaple fibre is compared, cheap, from a wealth of sources, environmental-friendly.Studies have shown that stalk fibre is used for ordinary cement sillIn, cement bending strength and shock resistance can be improved, but stalk fibre is for unavoidably there is tension in high alkalinity environmentIntensity decline and fiber mineralising problem, therefore the contradiction between stalk fibre and ordinary cement matrix high alkalinity environment is in recent yearsResearch hotspot.And under the room temperature of the application, the mineral of aluminate cement generate drated calcium aluminate and aluminium glue after meeting water, have gypsum to depositIn the case that generate entringite, no Ca(OH) 2 generate, so after aluminate cement aquation alkalinity it is low.Stalk fibre is used for aluminiumIn acid salt cement sill, it can avoid that there is novelty because of the problem of Behavior of Hardened Cement Paste basicity height causes fiber durability to decline.
4, bridge joint plugging material is commonly used in drilling engineering, solves the part petroleum leakage problems as caused by hole and crack,The leak stopping principle of bridge joint plugging material has " bridge formation ", blocking and insertion, diafiltration, " lacing wire ", expansion blockage and " card larynx " to act on.It willWalnut shell considers the preparation that a kind of this typical graininess bridge material is used for architectural engineering sealing agent to be worth doing, yet there are no related report, corePeach shell bits.
5, foundation pit campshed supporting leak crack and hole are larger, and simple bridge joint plugging material and cement injection material can not expireSufficient leak stopping requirement.Sealing agent of the present invention is used for the construction method of foundation pit campshed enclosure wall leak stopping, in scupper inside plugFull length range uses sack closure after the rope made of hemp fiber and cotton fiber of 200-1000mm, by scupper become leak hole andCrack；The conventional method of bored grouting is recycled to inject sealing agent of the invention.This construction method is easy to operate, does not increase engineeringAmount and construction machinery, leak stopping are at low cost；In addition, walnut bits with staple fiber by " bridges formation ", blocking with insertion, be percolated and " card larynx "Effect, hinders the outflow of sealing agent, plugging effect significantly improves.
Detailed description of the invention
Fig. 1 is foundation pit campshed enclosure wall and scupper schematic diagram；
Fig. 2 is scupper pretreatment A-A local cutting enlarged drawing；
Fig. 3 is that scupper fills in the A-A local cutting enlarged drawing after fiber；
Fig. 4 is the A-A local cutting enlarged drawing of scupper bored grouting；
Appended drawing reference: 1, campshed, 2, scupper, 3, ground, 4, gutter, 5, foundation pit, 6, soil layer, 7, leak paths, 8, fillingFiber, 9, gunnysack, 10, inclined hole.
Specific embodiment
Further details of elaboration is made to technical solution of the present invention with reference to the accompanying drawings of the specification.
Embodiment 1
As a preferred embodiment of the present invention, present embodiment discloses:
A kind of sealing agent for foundation pit campshed enclosure wall, including following raw material by mass percentage: aluminate cement is ripeMaterial 50%, anhydrite 6%, rice fibers 16%, sodium bentonite 16%, walnut shell bits 12%.
After mixing by above-mentioned four kinds of materials, it tests, obtains referring to GB23440-2009 " inorganic leak-stopping material "The performance indicator of the present embodiment sealing agent: presetting period 8min, final setting time 21min, 1h compression strength 6MPa, 2h compression strength16.5MPa, 28d compression strength 48MPa.
Aluminate cement clinker basicity factor 0.9 in the present embodiment, calcium aluminate is than coefficient 3.0, C2AS content 7%, chamotte powderGrind specific surface area 600m2/kg。
The specific surface area of anhydrite is 500m in the present embodiment2/kg。
Stalk is rice straw in the present embodiment, and stalk fibre length is less than 3mm.
Sodium bentonite smectite content is 93% in the present embodiment.
It is 20% that walnut shell bits 0.15mm standard screen, which tails over, in the present embodiment.
Embodiment 2
As another preferred embodiment of the present invention, referring to Figure of description 1-4, present embodiment discloses:
Using the sealing agent in embodiment 1, the scupper 2 of 300mm on 1 enclosure wall of campshed is blocked, as shown in Figure 1, the base of ground 3Campshed 1 and enclosure wall are set in hole 5, have scupper 2 on enclosure wall, specifically used method is:
Step A, by the clod on 2 surface of scupper, stone is cleaned out, and scupper 2 is dug funneling, is reduced and is exported at leakHydraulic pressure；Meanwhile it is spare that stone is packed into gunnysack 9；
Step B, it after rope made of hemp fiber and cotton fiber being mixed fluffy processing, is filled in scupper 2 with pliers；Machine passes through enclosure wallOn scupper 2, in the leak paths 7 in soil layer 6 after fiberfill fibers 8 to be tucked into enclosure wall, to block leak paths 7；For convenience of draining, gutter 4 generally is dug in the enclosure wall bottom of foundation pit 5；
Step C, after filling in fiber, the gunnysack 9 equipped with stone is blocked into scupper 2 at once, prevents fiber from largely being gone out by water；
Step D, using leakage point as the center of circle, on the circular arc that radius is 1000mm, 10 inclined holes 10, inclined hole 10 are symmetrically opened upIt is arranged in 45 °, aperture is about 30mm, and inclined tube is connected to leak paths 7.It is embedded to high pressure pouring pipe, in inclined hole 10 with remarksEnter sealing agent；
Step E, slurry and slip casting are prepared.According to sealing agent: water=1:0.8 mass ratio prepares slurry, logical with high-pressure grout injectorIt crosses intrusion pipe sealing agent is pressed into inside leak paths 7, completes leak stopping processing, 20 minutes after slip casting, anhydrous exudation.
Embodiment 3
As another preferred embodiment of the present invention, present embodiment discloses:
A kind of sealing agent for foundation pit campshed enclosure wall, including following raw material by mass percentage: aluminate cement is ripeMaterial 64%, anhydrite 10%, stalk fibre 2%, sodium bentonite 4%, walnut shell bits 20%.
After mixing by above-mentioned four kinds of materials, it tests, obtains referring to GB23440-2009 " inorganic leak-stopping material "The performance indicator of the present embodiment sealing agent: presetting period 7min, final setting time 18min, 1h compression strength 7.3MPa, 2h pressure resistanceSpend 17.6MPa, 28d compression strength 54MPa.
Aluminate cement clinker basicity factor 0.85 in the present embodiment, calcium aluminate is than coefficient 2.5, C2AS content 15%, clinkerGrinding specific surface area 600m2/kg。
The specific surface area of anhydrite is 500m in the present embodiment2/kg。
Stalk is corn stover in the present embodiment, and stalk fibre length is less than 3mm.
Sodium bentonite smectite content is 93% in the present embodiment.
It is 25% that walnut shell bits 0.15mm standard screen, which tails over, in the present embodiment.
Embodiment 4
As another preferred embodiment of the present invention, referring to Figure of description 1-4, present embodiment discloses:
Using the sealing agent of embodiment 3, the scupper 2 of 200mm on 1 enclosure wall of campshed is blocked, as shown in Figure 1, setting in foundation pit 5Campshed 1 and enclosure wall have scupper 2 on enclosure wall, and specifically used method is:
Step A, by the clod on 2 surface of scupper, stone is cleaned out, and scupper 2 is dug funneling, is reduced and is exported at leakHydraulic pressure；Meanwhile it is spare that stone is packed into gunnysack 9；
Step B, it after rope made of hemp fiber and cotton fiber being mixed fluffy processing, is filled in scupper 2 with pliers；Machine passes through enclosure wallOn scupper 2, in the leak paths 7 in soil layer 6 after fiberfill fibers 8 to be tucked into enclosure wall, to block leak paths 7；For convenience of draining, gutter 4 generally is dug in the enclosure wall bottom of foundation pit 5；
Step C, after filling in fiber, the gunnysack 9 equipped with stone is blocked into scupper 2 at once, prevents fiber from largely being gone out by water；
Step D, it is the center of circle with scupper 2, on the circular arc that radius is 800mm, symmetrically opens up 4 inclined holes 10, inclined hole 10It is arranged in 45 °, aperture is about 30mm, and inclined tube is connected to leak paths 7.It is embedded to high pressure pouring pipe, in inclined hole 10 with remarksEnter sealing agent；
Step E, slurry and slip casting are prepared.According to sealing agent: water=1:0.7 mass ratio prepares slurry, logical with high-pressure grout injectorIt crosses intrusion pipe sealing agent is pressed into inside leak paths 7, completes leak stopping processing, 20 minutes after slip casting, anhydrous exudation.
Embodiment 5
As another preferred embodiment of the present invention, present embodiment discloses:
A kind of sealing agent for foundation pit campshed enclosure wall, including following raw material by mass percentage: aluminate cement is ripeMaterial 60%, anhydrite 10%, stalk fibre 14%, sodium bentonite 4%, walnut shell bits 12%.
After mixing by above-mentioned four kinds of materials, it tests, obtains referring to GB23440-2009 " inorganic leak-stopping material "The performance indicator of the present embodiment sealing agent: presetting period 7.5min, final setting time 19min, 1h compression strength 7.1MPa, 2h resistance to compressionIntensity 18.6MPa, 28d compression strength 52.3MPa.
Aluminate cement clinker basicity factor 0.9 in the present embodiment, calcium aluminate is than coefficient 3.0, C2AS content 7%, chamotte powderGrind specific surface area 500m2/kg。
The specific surface area of anhydrite is 500m in the present embodiment2/kg。
Stalk is broomcorn straw in the present embodiment, and stalk fibre length is less than 3mm.
Sodium bentonite smectite content is 98% in the present embodiment.
It is 10% that walnut shell bits 0.15mm standard screen, which tails over, in the present embodiment.
Embodiment 6
As another preferred embodiment of the present invention, referring to Figure of description 1-4, present embodiment discloses:
Using the sealing agent in embodiment 5, the scupper 2 of 200mm on 1 enclosure wall of campshed is blocked, as shown in Figure 1, setting in foundation pit 5Campshed 1 and enclosure wall are set, there is scupper 2 on enclosure wall, specifically used method is:
Step A, by the clod on 2 surface of scupper, stone is cleaned out, and scupper 2 is dug funneling, is reduced and is exported at leakHydraulic pressure；Meanwhile it is spare that stone is packed into gunnysack 9；
Step B, it after rope made of hemp fiber and cotton fiber being mixed fluffy processing, is filled in scupper 2 with pliers；Machine passes through enclosure wallOn scupper 2, in the leak paths 7 in soil layer 6 after fiberfill fibers 8 to be tucked into enclosure wall, to block leak paths 7；For convenience of draining, gutter 4 generally is dug in the enclosure wall bottom of foundation pit 5；
Step C, after filling in fiber, the gunnysack 9 equipped with stone is blocked into scupper 2 at once, prevents fiber from largely being gone out by water；
Step D, using leakage point as the center of circle, on the circular arc that radius is 800mm, 6 inclined holes 10 are symmetrically opened up, inclined hole 10 is in45 ° of settings, aperture is about 30mm, and inclined tube is connected to leak paths 7.High pressure pouring pipe is embedded in inclined hole 10, in case injectionSealing agent；
Step E, slurry and slip casting are prepared.According to sealing agent: water=1:0.8 mass ratio prepares slurry, logical with high-pressure grout injectorIt crosses intrusion pipe sealing agent is pressed into inside leak paths 7, completes leak stopping processing, 20 minutes after slip casting, anhydrous exudation.
Embodiment 7
As another preferred embodiment of the present invention, present embodiment discloses:
A kind of sealing agent for foundation pit campshed enclosure wall, including following raw material by mass percentage: aluminate cement is ripeMaterial 58%, anhydrite 8%, stalk fibre 10%, sodium bentonite 10%, walnut shell bits 14%.
After mixing by above-mentioned four kinds of materials, it tests, obtains referring to GB23440-2009 " inorganic leak-stopping material "The performance indicator of the present embodiment sealing agent: presetting period 6.5min, final setting time 17min, 1h compression strength 7.2MPa, 2h resistance to compressionIntensity 18.4MPa, 28d compression strength 52.3MPa.
Aluminate cement clinker basicity factor 0.9 in the present embodiment, calcium aluminate is than coefficient 3.0, C2AS content 7%, chamotte powderGrind specific surface area 600m2/kg。
The specific surface area of anhydrite is 600m in the present embodiment2/kg。
Stalk is rape stalk in the present embodiment, and stalk fibre length is less than 3mm.
Sodium bentonite smectite content is 98% in the present embodiment.
It is 8% that walnut shell bits 0.15mm standard screen, which tails over, in the present embodiment.
Embodiment 8
As another preferred embodiment of the present invention, referring to Figure of description 1-4, present embodiment discloses:
Using the sealing agent of above-described embodiment 7, the scupper 2 of 300mm on 1 enclosure wall of campshed is blocked, as shown in Figure 1, in foundation pit 5Campshed 1 and enclosure wall are set, have scupper 2 on enclosure wall, specifically used method is:
Step A, by the clod on 2 surface of scupper, stone is cleaned out, and scupper 2 is dug funneling, is reduced and is exported at leakHydraulic pressure；Meanwhile it is spare that stone is packed into gunnysack 9；
Step B, it after rope made of hemp fiber and cotton fiber being mixed fluffy processing, is filled in scupper 2 with pliers；Machine passes through enclosure wallOn scupper 2, in the leak paths 7 in soil layer 6 after fiberfill fibers 8 to be tucked into enclosure wall, to block leak paths 7；For convenience of draining, gutter 4 generally is dug in the enclosure wall bottom of foundation pit 5；
Step C, after filling in fiberfill fibers 8, the gunnysack 9 equipped with stone is blocked into scupper 2 at once, prevents fiber from largely being rushed by waterOut；
Step D, using leakage point as the center of circle, on the circular arc that radius is 1000mm, 8 inclined holes 10, inclined hole 10 are symmetrically opened upIt is arranged in 45 °, aperture is about 30mm, and inclined tube is connected to leak paths 7.It is embedded to high pressure pouring pipe, in inclined hole 10 with remarksEnter sealing agent；
Step E, slurry and slip casting are prepared.According to sealing agent: water=1:0.8 mass ratio prepares slurry, logical with high-pressure grout injectorIt crosses intrusion pipe sealing agent is pressed into inside leak paths 7, completes leak stopping processing, 20 minutes after slip casting, anhydrous exudation.
Embodiment 9
As another preferred embodiment of the present invention, present embodiment discloses:
A kind of sealing agent for foundation pit campshed enclosure wall, including following raw material by mass percentage: aluminate cement is ripeMaterial 53%, anhydrite 7%, stalk fibre 8%, sodium bentonite 13%, walnut shell bits 19%.
After mixing by above-mentioned four kinds of materials, it tests, obtains referring to GB23440-2009 " inorganic leak-stopping material "The performance indicator of the present embodiment sealing agent: presetting period 10min, final setting time 26min, 1h compression strength 5.1MPa, 2h resistance to compressionIntensity 13.0MPa, 28d compression strength 56.5MPa.
Aluminate cement clinker basicity factor 0.85 in the present embodiment, calcium aluminate is than coefficient 2.5, C2AS content 20%, clinkerGrinding specific surface area 500m2/kg。
The specific surface area of anhydrite is 500m in the present embodiment2/kg。
Stalk is cotton stalk in the present embodiment, and stalk fibre length is less than 3mm.
Sodium bentonite smectite content is 93% in the present embodiment.
It is 25% that walnut shell bits 0.15mm standard screen, which tails over, in the present embodiment.
Embodiment 10
As another preferred embodiment of the present invention, referring to Figure of description 1-4, present embodiment discloses:
Using the sealing agent in the present embodiment, the scupper 2 of 100mm on 1 enclosure wall of campshed is blocked, as shown in Figure 1, in foundation pit 5Campshed 1 and enclosure wall are set, have scupper 2 on enclosure wall, specifically used method is:
Step A, by the clod on 2 surface of scupper, stone is cleaned out, and scupper 2 is dug funneling, is reduced and is exported at leakHydraulic pressure；Meanwhile it is spare that stone is packed into gunnysack 9；
Step B, it after rope made of hemp fiber and cotton fiber being mixed fluffy processing, is filled in scupper 2 with pliers；Machine passes through enclosure wallOn scupper 2, in the leak paths 7 in soil layer 6 after fiberfill fibers 8 to be tucked into enclosure wall, to block leak paths 7；For convenience of draining, gutter 4 generally is dug in the enclosure wall bottom of foundation pit 5；
Step C, after filling in fiber, the gunnysack 9 equipped with stone is blocked into scupper 2 at once, prevents fiber from largely being gone out by water；
Step D, it is the center of circle with scupper 2, on the circular arc that radius is 500mm, symmetrically opens up 10 inclined holes 10, inclined hole 10It is arranged in 45 °, aperture is about 30mm, and inclined tube is connected to leak paths 7.It is embedded to high pressure pouring pipe, in inclined hole 10 with remarksEnter sealing agent；
Step E, slurry and slip casting are prepared.According to sealing agent: water=1:0.8 mass ratio prepares slurry, logical with high-pressure grout injectorIntrusion pipe is crossed by the channel interior of sealing agent indentation scupper 2, completes leak stopping processing, 30 minutes after slip casting, anhydrous exudation.
The above is only presently preferred embodiments of the present invention, not does limitation in any form to the present invention, it is all according toAccording to technical spirit any simple modification to the above embodiments of the invention, equivalent variations, protection of the invention is each fallen withinWithin the scope of.