CN1266129A

CN1266129A - Foundation grouting apparatus and method thereof

Info

Publication number: CN1266129A
Application number: CN00103371A
Authority: CN
Inventors: 岛田俊介
Original assignee: Soil Strengthening Engineering Co Ltd (jp) Tokyo Japan
Current assignee: Soil Strengthening Engineering Co Ltd (jp) Tokyo Japan; Kyokado Engineering Co Ltd
Priority date: 1999-03-09
Filing date: 2000-03-02
Publication date: 2000-09-13
Anticipated expiration: 2020-03-02
Also published as: JP2000257057A; KR20000071412A; KR100397250B1; JP3275039B2; CN1137312C

Abstract

To prevent disorder penetration of a curing agent on each stage because of blockade of a curing agent discharge port due to a cavity on a drilled hole on the outside of an outer tube, to carry out injection of the curing agent favorably in construction performance and at one time in all stages, to shorten a construction period and to reduce cost in duplex tube double packer injection construction. Bag bodies 26 provided on a plural number of stages in the axial direction of an outer tube 21 are expanded and closely fastened on a hole wall of a drilled hole 7 without interposing seal grout in the drilled hole formed on a natural ground, and the ground is consolidated. Consequently, it is possible to constantly and penetratively injecting specified quantity of a curing agent in the ground natural ground in large quantity as a whole as designed and to certainly construct a large diametrical and lengthy molded body under the ground regardless of resistance pressure and falling of the hole wall through a pressure space between each of packers from exhaust ports of exhaust nozzles on a plural number of the stages provided on an inner tube and to certainly construct a large diametrical lengthy molded body underground even when a hole wall falling phenomenon, etc., are caused.

Description

The foundation grouting device and method

The disclosed technology of the application relates to the stabilization works of ground, the construction technology of ground stabilization effect when obtaining to prevent foundation liquefaction or big degree of depth excavation, particularly relate to mode, will be used for the hardened material that the large volume ground carries out ground stabilization is filled into the technical field of ground according to the construction works that prevents to liquefy.

In the past, for because the peripheral ground of the underground construction of the foundation dredging or the big degree of depth, there is the liquefaction phenomenon that causes ground to flow because of underground water, the extensive stabilizing construction technology that adopts, be by following manner partly, or in the zone of broad, ground is reinforced, promptly, grout pipe is inserted in the hole that is formed in this ground hardened materials such as grout injection or chemical liquid agent.

People are the technology to being adopted in the construction of ground stabilization stabilizing also, carry out various exploitations and improved research, recently, practical pouring construction method has been to use as shown in Figure 7, the body 1 that has the double-deck filling mode of dual pipe of pocket 5 in the axial direction with prescribed distance, this job practices is the hole that forms regulation in the basement rock of ground, cement paste 13 is filled in the inside in this hole, above-mentioned body 1 is inserted in the formed hole, from inserting the interior pipe of outer tube, by being arranged at the outlet opening 3 ' of pocket 5 inside, open sleeve 4 ', packing materials 6 such as filling concrete slurry expand this pocket 5, after closely fixing with the hole wall of pore-forming, pipe in inserting, be arranged at outlet opening 3 on the body 1 by spacing according to the rules, the hardened material of perfusion regulation is opened the sleeve 4 that is arranged at these body 1 outlet opening 3 outsides in chimeric mode, above-mentioned sleeve mortar is split, pore-forming hole wall by in the ground pours into hardened material in ground, thereby has realized stable processing.

But, as preventing the job practices that liquefies, with the scope of broad with hardened material when 1 grout pipe is filled into the ground of relative broad range, owing to sealed by the sealing mortar around the grout pipe, it is less to be used for making hardened material to be penetrated into the opening towards ground of ground like this, thereby every batch of more hardened material of discharge rate is difficult to equably, for a long time, realizes infiltration equably continuously in relative broad range.

In addition, as shown in Figure 8, in the basement rock 7 of ground, form the pore-forming 8 of given size, inside at this pore-forming 8, pass sealing mortar 13, insert following outer tube 12, on this outer tube 12, offer specified quantity, the outlet opening 9 of the given size that forms with prescribed distance vertically, be band shape week at each outlet opening 9 upper edges ring and be provided with rubber bush 10, above-mentioned in addition outer tube 12 is provided with filter screen 11, according to have rubber filling 14 with prescribed distance, the inside that 14 mode is inserted above-mentioned outer tube 12 with interior pipe 17, between each rubber filling 14, form space 15, in addition along interior pipe 17 axially, offer a plurality of jets 16, in the space 15 between rubber filling 14, the outlet opening 9 of outer tube 12 is in the state that mutual maintenance is communicated with the jet 16 of interior pipe 17, step-by-step system by predetermined stroke, the regulation hardened material of carrying in the pressure mode from the hardened material path 18 of interior pipe 17 inside is by the jet 16 of pipe 12 in above-mentioned, pass rubber filling 14, through the outlet opening 9 of above-mentioned outer tube 12, open rubber bush 10 in space 15 between 14, the interior sleeve mortar 13 of hole wall of pore-forming 8 is split, thereby infiltration is poured in the basement rock of ground.

In addition, the path of label 19 expression hardened materials, the path of this hardened material is meant that hardened material is from hardened material path 18, through the jet 17 of interior pipe 17,, pass the outlet opening 12 of outer tube 17 by space 15, sleeve mortar 13 is split, and infiltration is poured into the interior path of basement rock of ground.

Also have, label 10 ' expression rubber bush, it was provided with on the outer tube outlet opening in 15 outsides, space between the filling 14,14 along ring week.

Yet, confirm through test, in the grout pipe 1 ' of filling mode shown in Figure 8, from interior pipe 17, hardened material path 18 in 17 is discharged, hardened material with the step-by-step system of predetermined stroke can make the sleeve mortar 13 in outer tube 12 outsides split, and be penetrated in the basement rock of ground, in addition as Fig. 9, shown in 10, even at pump pressure, promptly corresponding to the pressure in the interior pipe 17, the renitency of outlet opening outside ground takes place under the situation of various variations, because the jet 16 as aperture in being somebody's turn to do in the pipe 17 (such as, in Fig. 9, its aperture is 1.0mm, in Figure 10, its aperture is 2.5mm) reason, even in the renitency in the outside to a certain degree variation, the delivery flow of jet 16 take place, such as in Fig. 9, be 50kg/cm in the pipe internal pressure ²The time, even the renitency of ground is at 0～30kg/cm ²Scope in change, still can obtain to be roughly the emitted dose of 4.51/min, equally in Figure 10, above-mentioned flow is 91/min and not changing, and keeps constant substantially.

; for the above-mentioned method of executing down; in the work progress of reality; sleeve mortar between outer tube and pore-forming hole wall can be deposited in the pore-forming; or mixing with this soil body because of soil body slump on every side; on depth direction, fixed in heterogeneous mode, thus be difficult to realize the discharge infiltration of grouting liquid.

Have again, same in above-mentioned bilayer filling mode shown in Figure 7, owing to adopt the grouting way of sealing mortar cracking in the hardened material that makes the predetermined stroke step-by-step system, in principle, should obtain the grouting flow of homogeneous, but because when the hardened material perfusion of reality, the local concentration of sealing mortar 13, or, hole wall changes because of destroying concretion state density is changed cause, has following shortcoming like this, promptly do not meet principle, corresponding to interior pipe pressure and the homogeneous grouting of spraying the impossible acquisition of bore ormal weight.

Above-mentioned situation is meant, can not carry out the grouting of ormal weight from a plurality of outlet openings simultaneously, also can not be in the milk piecemeal with short grouting step.

Therefore, there is following shortcoming in the foundation grouting job practices of this existing mode, promptly can not prevent the construction of base fluid shapeization in large area expeditiously.

In the manner described above, the shortcoming of existing grouting way, be when grouting step is longer, because the soil property of ground changes on every side, thereby grouting liquid is poured in the bigger soil layer of penetrating fluid, in whole steps, be difficult to be penetrated on every side in the ground, for this reason, if when grout pipe forms sealing by the sleeve mortar on every side, then because the existence of sleeve mortar is arranged, the opening of ground is less again towards periphery, thereby when every batch discharge rate was big, grouting pressure can be excessive, in addition when long-time continuous is permeated, the gelation thing can stop up the opening of the sealing mortar around the grout pipe, thereby hinders grouting for a long time.

So, the inventor (the applicant) is at above-mentioned foundation grouting technique situation, as for preventing the construction such as aqueous chemical industry journey, by hardened material the soil body of larger volume is reinforced economically, building technical applications in building industry provides a kind of good foundation grouting device and job practices thereof, in this foundation grouting device and job practices thereof, be conceived to:

1. increase by 1 perfusion step;

2. increase the discharge rate of each perfusion step;

3. at per 1 step, be in the milk for a long time continuously, pour into chemical liquid agent in large quantities, realize that in relative broad range infiltration is fixed, for Fig. 7, any one job practices in 8 all is very necessary, prevent aqueousization grouting works and the hardened material of dark foundation pouring is formed in the improvement of ground above-mentioned, even the soil mass property of ground changes, under the situation about changing with the renitency that causes pore-forming hole wall slump etc. in the ground, still can under constant state, be in the milk with stable discharge rate, also can carry out large volume grouting for a long time continuously, the soil body of large volume be reinforced, in addition, in bigger grouting step, can carry out disposable grouting equably, and can realize fixedly, in ground, form the desired formed body of design.

According to above-mentioned situation, the applicant provides a kind of new job practices, this job practices is breakthrough grouting technique, it is its performance with the double-deck filling of existing dual pipe job practices, and can be in scope from sandy soil to cohesive soil, carry out reasonable consolidation by grouting corresponding to the ground performance, and can the reduction of erection time.

Below, pass through Figure 12, to new grout construction method, be briefly described with regard to its principle, shown in Figure 12 (a), in ground, embed the sleeve-shaped pore-forming, shown in Figure 12 (b) by the grouting outer tube, the grouting outer tube 21 that is equiped with pocket 26 is embedded, in these outer tube 21 inside, shown in Figure 12 (c), interior pipe 28 is inserted, at the pocket 26 inner perfusion hardened materials of filling, the pore-forming of corresponding pocket 26 forms filling, and ground around it is carried out ground compacting 26 ', shown in Figure 12 (d), pipe 28 in inserting, perfusion permeability hardened material.

In order to address the above problem, according to above-mentioned principle modes and purpose, with front the scope of the said claims is the technical scheme formation of the present invention of main contents, the 1st aspect relates to a kind of foundation grouting device, in this device, on the body of the outer tube that is provided with the pocket that can expand in chimeric mode by hardened material, offer a plurality of hardened material outlet openings vertically, portion axially offers a plurality of hardened material jets that formed by aperture along identical within it, and the interior pipe that is provided with a plurality of fillings in the mode that accompanies this jet is inserted in above-mentioned outer tube inside, between inner and outer pipes, form several sections spaces vertically by a plurality of fillings, on the sleeve pipe of above-mentioned outer tube, be provided with 1 pocket at least, pocket one side at this outer tube, at least one hardened material outlet opening and should between a plurality of fillings in the pipe, at least offer 1 hardened material outlet opening, this hardened material outlet opening and hardened material jet keep being communicated with in spaced vertically the same space mutually mutually.

The hardened material jet of pipe is formed by aperture in above-mentioned, its gross area is less than the section area of interior pipe, owing to form with less hole, thereby hardened material just sprays to above-mentioned space, in addition, the 2nd aspect that the present invention relates to, relate to a kind of provisions for grouting, this device has the interior pipe of perfusion hardened material in ground, should interior pipe insertion be provided with in the outer tube of a plurality of outlet openings, in interior pipe, hardened material can be simultaneously from following a plurality of jets ejections, these a plurality of jets are between at least 3 fillings of expanding by fluid.

In addition, in the foregoing description mode, also relate to the 3rd direction, it is the technical scheme of foundation grouting construction, in this scheme, pressure sensor is faced mutually with each insulating space, following outer tube is being inserted in the hole that forms ground, this outer tube is provided with can be by the pocket of hardened material expansion, have a plurality of hardened material outlet openings in addition, from being formed at a plurality of hardened material outlet openings on this outer tube sleeve pipe, hardened material is filled in the ground, by hardener above-mentioned pocket is expanded, above-mentioned pocket is on the hole wall that closely is fixed in above-mentioned pore-forming, and hardened material is from having the interior pipe ejection of a plurality of jets, thereby this hardened material is penetrated into the ground from the outlet opening of above-mentioned outer tube.

In addition, in such scheme, generally the filling that forms by perfusion hardened material in pocket is being carried out before the grouting in ground, but, even under the situation that pocket grouting and the grouting in ground are carried out simultaneously, because the grouting amount in pocket is seldom, the stage in the early stage, still can after forming, filling in ground, be in the milk continuously.

Also have, in such scheme, if in pocket the mortar of the rapidly solidified property of perfusion or moment consolidation fluid, just then construction can be carried out apace.

In such scheme, when the order according to construction is described, technology of the present invention forms in the following manner, this mode is: the superiority that can put the double-deck filling of dual pipe job practices more to good use, hardened material is poured in the ground, it has the interior pipe of grouting of special construction, to will with such as, 2 meters spacing is inserted in the pocket of grouting on the outer tube, the filling concrete slurry, or gel time is the hardened material of moment～long period, ground because of the pore-forming disturbance is closely contacted with the space of being in the milk between the outer tube, under the wad act of brute force, to wait the ground of constraint to pour into step as 1 according to 2 meters, the interior pipe of above-mentioned special construction is inserted in the outer tube, thereby can be from two outlet openings up and down, in the pore-forming space, be in the milk with uniform amount, this job practices relates to following breakthrough grouting technique, it keeps the performance of the double-deck filling of existing dual pipe job practices, and can be in scope from sandy soil to cohesive soil, corresponding to ground character, carry out rational consolidation by grouting, but reduction of erection time in addition.On the body of outer tube, be inserted with 1 pocket at least, and be inserted with a plurality of pockets usually, in the annular gap between this external each inner and outer pipes, filling or air type filling that rigid plastics system can be set (comprise by air, fluid expansions such as the inert gas that water or nitrogen are such and the filling that forms) etc., inside at this outer tube, the interior pipe that will have a hardened material supply passageway is fixed in the rubber on the outer tube, or air type is packed in the adjacent mutually formation space, position, interval of prescribed distance, according to the gross area of the hardened material jet of interior pipe less than the cross section of interior pipe pipeline long-pending mode, form the jet of aperture, each pocket expands because of hardened materials such as cement mortar, with the tight state of contact of hole wall of pore-forming under fixing, also with the ground compacting around the pocket, form its size in fact greater than the packing of expansion pocket, chemical liquid agent can not crossed each pocket and permeate, because the length of 1 grouting step is bigger, even like this under the situation that produces the discharge resistance that causes because of the hole wall slump in the pore-forming space around the outer tube etc., spray to above-mentioned space by making at the hardened material of discharging from the aperture jet of interior pipe, change irrelevant with hardened material and the outer renitency of pipe, hardened material still can be from a plurality of jets of outer tube, with stable ormal weight, discharge according to constant state, really in the grouting step of regulation, this hardened material is equably to ground infiltration perfusion, in the big zone of regulation, what formation had a given size grows up to body, in addition, if in each pressure space, pressure sensor is set, whether the perfusion osmotic pressure that also can detect hardened material in this pressure space on the ground works really, pocket plays fixation to the pore-forming hole wall, and with stable quantity infiltration is poured on the stratum in space continuously for a long time from the hardened material of the jet of pocket type ejection, in ground, form large-sized, long works cylindraceous, thereby prevent to produce aqueousization phenomenon, and make stable the carrying out of excavation maintenance with big degree of depth ground.

Also have, in Figure 12, being arranged on the quantity of the pocket on the outer tube is 1 group down, organize also can be set more, but be provided with 1 group at least.That is, in the short occasion of grouting bag, a side is provided with 1 pocket on the ground, on the lower side outer tube of this pocket a plurality of outlet openings is set, thereby can be from these a plurality of outlet openings, to pour into the grouting amount of regulation greater than twice number of times.

Fig. 1 is the partial cut away side views of foundation grouting device of the present invention;

Fig. 2 is the sectional view of local major part of amplifying;

Fig. 3 is half enlarged side view of cutting open of outer tube;

Fig. 4 is the explanation sectional view of the construction main points of the provisions for grouting in the insertion pore-forming;

Fig. 5 for the construction state prevent to liquefy the relevant schematic cross sectional views of construction technology;

Fig. 6 is the view sub-anatomy of other embodiment of pipe in the expression, and wherein Fig. 6 (a) and (b) are for decomposing the local longitudinal sectional view that connects;

Fig. 7 is based on prior art, the schematic cross sectional views of the double-deck filling grouting of dual pipe of the sleeve mortar by pocket is housed;

Fig. 8 is equally based on prior art, and the sectional view that the provisions for grouting of sleeve mortar is constructed to pore-forming is housed;

Fig. 9 is that nozzle keeps certain carrier pipe curve map between the flow of jet of renitency from Fig. 8 and aperture;

Carrier pipe curve map between renitency when Figure 10 is the change of aperture jet size and the flow of jet;

Figure 11 is the schematic cross sectional side view of the basic embodiment of the present invention;

Figure 12 is the schematic cross sectional side view of identical sequence of construction, Figure 12 (a) is the schematic cross sectional side view of casing pipe hole forming, Figure 12 (b) embeds schematic cross sectional side view for outer tube, Figure 12 (c) is for carrying out the schematic cross sectional side view of ground ground compacting by pocket, Figure 12 (d) is the schematic side elevation of permeability hardened material perfusion;

Figure 13 is the schematic plan sectional view of Figure 11.

Can realize form of the present invention, be described below with reference to Fig. 1～7 and Figure 11～13 as embodiment.

The part identical with accompanying drawing below Fig. 8 described with identical label.

Shown position is the hardened material pouring construction state that prevents aqueousization of ground usefulness, in the state shown in Fig. 1～4, the predetermined stroke step-by-step movement ground provisions for grouting that constitutes a key point of the present invention is adopted in label 20 expressions, as Fig. 1, shown in 2, its primary structure is by the steel or the plastic outer tube 21 of specified diameter, interior pipe 28 and a plurality of pocket 26 constitute, should be included in the axial assigned position of relative this outer tube 21 with the rigid plastics system of regulation number setting or the filling 29 of rubber system by interior pipe 28 ... the above-mentioned pocket 26 that is formed by synthetic resin is arranged on the body of this outer tube 21 with prescribed distance, the front bottom end of above-mentioned outer tube 21 covers the formation closed by lid 27, the pocket 26 of its leading section ... upper and lower side by

ring body

24,24 are fixed on the side of outer tube 21, thereby can realize the free wxpansion contraction.

In addition, offer the hardened material outlet opening 25 of regulation in the inboard of this pocket 26,, be provided with the sleeve 23 of rubber system along ring week according to the mode that this outlet opening is covered at the lateral surface of each outlet opening 25.

In addition, above-mentioned pocket 26 is installed on the body of above-mentioned outer tube 21 with prescribed distance (being not limited to identical spacing), side at the outer tube 21 of each pocket 26 inside, offer hardened material outlet opening 25 equally, and the sleeve 23 that rubber system is arranged in the arranged outside of this outlet opening 25, thereby this outlet opening can be realized freely opening and closing according to mode same as described above.

In addition, as shown in Figure 1, in outer tube 21, be provided with the joint 22 of the turnbuckle type that should be specific length, thereby the unit outer tube can connect according to preseting length.

Yet, as described above, provisions for grouting 20 relative pore-formings 8 are provided with in the following manner, this mode is: the inside of this provisions for grouting 20 is unlike existing mode shown in Figure 8, be filled with sleeve mortar 13, be that the side with each pocket 26 relative outer tube 21 of prescribed distance setting on the outer tube 21 is rugosity, or turn up shape, this provisions for grouting 20 successfully inserts in the pore-forming 8 of ground, and each section ground of pore-forming is corresponding in advance with each between each

pocket

26,26.

Between rubber system or

plastic filling

29,29, offer

jet

34,34 ... this filling 29,29 spacing according to the rules the week is arranged at along ring in the interior pipe 28 of inside of the outer tube 21 between each

pocket

26,26 of insertion, shown in the Fig. 9,10 that illustrates according to Fig. 8, can change under the irrelevant situation with the outside renitency of interior pipe 28 basically with pressure-feed hardened material 19 from the pressure delivery pump of not shown ground for the hardened material path of inside, at the stair step of each predetermined stroke, spray hardened material 19 with ormal weight.

Have, can known pressure sensor be set with respect to following space 32, these space 32 fingers are provided with prescribed distance in interior pipe 28, the space between rubber system or the plastics system filling 29,29, the inside of pipe 28 in the lead of each pressure sensor extends to.

Also have, the front end of pipe 28 is stopped up by blind bolt 27 in this, thereby forms sealing state.

Embodiment at the foundation grouting job practices of the provisions for grouting 20 of said structure is described below, whole steps is disposable perfusion infiltration hardened material, embodiment as shown in Figure 4, unlike existing mode, be filled with under the state of sleeve mortar 13, be located under the situation of outer tube 21 outsides with each pocket 26 along plugging in ring week of stipulating, above-mentioned provisions for grouting 20 successfully is inserted in the basement rock of ground, with the prescribed depth in the pore-forming 7 of setting size formation.

In addition, if pressure delivery pump by not shown ground, inwardly manage the hardened material supply passageway 18 of 28 inside with the pressure mode of movement and supply with the hardened material of stipulating 19, then this hardened material 19 is from each jet 34 ejection of interior pipe 28, each pocket 26 is expanded, each pocket 26 that expands closely contacts with the hole wall of pore-forming 7 from inboard, form stationary state, in addition because above-mentioned expansion force, As time goes on, ground around making is in the ground compacting state, keeps the insertion attitude of setting in the pore-forming 8 of the state of insertion.

The grouting liquid that is used for permeating, by the pressure delivery pump, not at pocket 26, the part that is filled with sleeve mortar 13 between 26 is respectively by respectively clogging 29 in the interior pipe 28, space 32 between 29, keep the storage pressure condition, by the outlet opening in the outer tube 21 25, under the wad act that the pressure contact that 26 pairs of pore-formings of pocket 8 carry out fixedly causes, hole wall internal penetration perfusion to pore-forming 7, at this moment, as previously described, even be the hole wall place of pore-forming 7, shown in the image pattern 4 like that, cave in 7 ' existing picture of generation, situations such as obstruction take place in the several part in the outlet opening 20, produce under the renitent situation, as above-mentioned Fig. 9, shown in 10, the hardened material of ormal weight is from the jet 34 of interior pipe 28, with the irrelevant situation of renitency under, with interior pipe 28 pressure inside (pump pressure), corresponding to the aperture of jet, according to a certain degree spraying, the hardened material of this ormal weight permeates towards periphery, thereby realize the whole relatively grouting degree of depth, hardened material pours into infiltration uniformly from the outlet opening of outer tube 21, realizes a large amount of for a long time grouting continuously, can in ground, form the columnar structure of the large-size of regulation according to design.

In addition, Figure 11,12,13 additionally represent the embodiment of basic construction, as shown in figure 11, interior pipe for special construction, interior pipe inserted with 2 meters spacings be inserted in the pocket 26 on the grouting outer tube 21, the filling concrete slurry, or the gel consolidation time be the moment～long hardened material 26 ', will be because of the ground of pore-forming 7 disturbances and the space tightly compacted 26 ' between the outer tube 21, with this filling 26 with 2 meters the ground that spacing was limited as 1 perfusion step, thereby after can inserting in the outer tubes 21 at interior pipe 28, by managing 28 in this with above-mentioned special construction, from the outlet opening of two sections, hardened material is filled in the pore-forming space with uniform amount.In order present embodiment is described further below by Figure 12, shown in Figure 12 (a), embed sleeve pipe by the grouting outer tube, pore-forming 7 in ground, shown in Figure 12 (b), embedding is inserted with the grouting outer tube 21 of pocket 26, shown in Figure 12 (c), insert interior pipe 28,, clog by the brute force that this pocket 26 forms at the pocket 26 inner perfusion hardened materials of filling, peripheral ground is carried out ground compacting 26 ', shown in Figure 12 (d), interior pipe 28 is inserted outer tube 21 inside, thus perfusion permeability hardened material.

But as the example of the design scheme of this job practices, shown in Figure 11～13, if following condition is set up, this condition refers to:

1. the square setting of burying spacing P=2m * 2m underground of grout pipe

2. filling speed f=301/min

3. the single hole of grout pipe is reinforced the long-pending Ap=2m * 2m=4m in plane ²

4. the compacted soil scale of construction (m of 1 step ³) V=2m (reinforcing height) * 4m ²=16m ³

5. grouting amount (kl) Q=V * (0.35～0.40)=50.6～6.4kl of 1 step

The grouting rate of this moment: 0.35～0.40

6. the grouting time t of 1 step ₁=6kl ÷ 0.03kl/min=200min=3.3

Hour (continuously grouting time)

7. grouting loading (l) q=60l of tamping bag

Then can carry out a large amount of for a long time grouting.

In addition, owing to after being pressed into pocket 26 hardened materials, expand, so should As time goes on be able to ground compacting by the periphery ground, form the packing of its size in fact greater than pocket 26, grouting liquid can not crossed each packing and scatter, shown in Figure 11,12 (d), this grouting liquid infiltration is poured in the whole setting ground, realizes solidifying.

In addition, fill the sealing mortar in the space between

pocket

26,26,, by above-mentioned special interior pipe,, still can pour into a certain amount of hardened material, and reach the degree of depth of regulation by outer tube even like this under the situation that pore-forming caves in.

This point is main aspect of the present invention.

Therefore, owing to there is the dilatancy filling of being located on the outer tube to exist, because unlike existing mode, be filled with sleeve mortar 13 in the pore-forming 7 that in the basement rock of ground, forms, data shown in Fig. 8,9 like this can be really uniformly under the state from the hardened material of interior pipe 28 ejections, and perfusion is permeated in whole stratum ground, can in ground, form and to meet design, have the formed body of large-size.

Have again, but the outlet opening of outer tube 21 also shown in the image pattern 2 like that, in addition, but the outlet opening of pocket 26 up and down also shown in the image pattern 2 like that, be provided with up and down a plurality ofly between the

pocket

26,26, in the mode of Fig. 4, between

pocket

26,26 up and down, can be provided with 1 at least.

In this technology, and each adjacent filling 29,29 of annular gap portion of outer tube 21 and interior pipe 28 between, the storage pressure condition in formed space 32, can pass through pressure sensor (occasion that is being provided with) detects, in the not shown determinator on the ground, detect the storage pressure condition, promptly detect the situation of being in the milk.

Also have, confirm the perfusion state of the hardened material in the space 32,, can further confirm respectively to clog the stationary state of 29 relative outer tube 21 inwalls, can guarantee the ejection of hardened material according to design by the piezometry data.

In addition, by sleeve 23, can prevent from really to produce the adverse current phenomenon from the hardened material that the hardened material outlet opening 25 of outer tube 21 is discharged.

In the manner described above, as shown in Figure 5, provisions for grouting 20 is inserted in the ground in the mode with vertical or diagonal cross, thereby can prevent the construction of liquefying really.

Also have, as the form of design alteration, obviously, filling is the filling of rubber system not only, but also can be the air type filling.

Such as, pipe grouting part in the label 28 ' expression among Fig. 6, in this, manage in the grouting portion 28 ', spacing according to the rules vertically, be provided with air filling 29 ', 29, with air, gas (such as, nitrogen) or the action stream 30 ' of the liquid of water etc. and the stream 40 of grouting liquid, they are for dual pipe or be set up in parallel and (suppose that the grout pipe stream comprises two, be 3 heavy pipes, or be 3 and tubulations), they are by air outlet 30 "; with fluid perfusion to space 29 " in, make this air filling 29 ' that forms by the rubber filling, 29 ' expands, and it is pressed against on the inwall of outer tube 21, from jet 34 jet grouting liquid, by space 32, from the jet 25 of

outer tube

21,25 pour in ground.Its effect does not have difference with the foregoing description in fact.

Have again, by the part of the grouting portion in the interior pipe 28 shown in Figure 6, or according to the rules spacing adopt the mode of flexible pipe body form flexible in pipe, even like this under the situation of outer tube 21, still can insert interior pipe at an easy rate because of the soil pressure bending.

In addition, extend in the grouting liquid of pipe grouting portion or the fluid flowing path that plays wad act can adopt dual pipe or flexible hose side by side etc.

When enforcement is of the present invention, also can be in interior pipe, according to mode shown in Figure 2, be in the milk when on grout compartment, moving, in addition, if adopt mode shown in Figure 4, then also can be in the milk to a plurality of grout compartments once, in addition can be under the state that interior pipe is fixing, the grout compartment to entire depth is in the milk once.

According to the present invention, in the engineering that prevents soft foundation liquefaction, or in the constructions such as stabilization works to the excavation on the basis of building, for in ground, adopt the double-deck filling mode of dual pipe to carry out the hardened material pouring construction, then adopt following form of construction work, this mode is: on the body of outer tube vertically, plug one or more pockets, interior pipe is inserted in the outer tube, in this pocket, be pressed into the hardened material of cement paste etc., pocket is expanded, form induration, it closely is fixed in the pore-forming, a plurality of outer tubes are set in consolidated subsoil in this manner, in curing because of consolidation fluid, after each pocket is fixed in the ground, hardened material is by the pore-forming space, hardened material outlet opening infiltration between the pocket on being opened in outer tube is poured into the ground, and in order to carry out above-mentioned construction, formed following provisions for grouting, in this provisions for grouting, between pocket, form the hardened material outlet opening of at least one outer tube, the hardened material jet of pipe in interior pipe, offering, this jet is between set a plurality of fillings, like this by hardened material outlet opening and hardened material jet are formed in the following manner, this mode is: above-mentioned outlet opening and jet are by the isolated the same space of filling that is formed in the grout pipe that is integral setting, keep mutually being communicated with, even in the hardened material outlet opening of outer tube, produce under the renitent situation that causes because of the hole of collapsing etc., even or producing under the renitent situation that causes because of the soil layer difference, still can guarantee of the hardened material jet ejection of the hardened material of ormal weight from interior pipe, even 1 grout compartment is longer, under the bigger situation of every batch of discharge rate of every section, still can be equably the hardened material of ormal weight be filled into prescribed depth, can be in the milk continuously for a long time at each step, pour into a large amount of chemical liquid agents, therefore, can obtain following excellent results, promptly really form and have by the overlength of the large-size of design, and have larger-diameter cylindrical shell formed body.

Also have,, pocket is expanded, with ground compacting on every side, the more certain extremely strong big filling effect of so just acquisition because grouting liquids such as cement paste are pressed in a plurality of pockets that are arranged on the outer tube body.

So, needn't adopt the sleeve mortar to seal around the outer tube, by 1 group of whole pore-forming space that pocket surrounds up and down, hardened material permeates in ground on every side.

Here, be used in reference to unit area axial in the grout pipe of temporary transient grouting if will be called the term of " 1 step ", then because the infiltrating area in the hardened material source of each step is very large, even like this under the bigger situation of the every batch of hardened material discharge rate, still obtain following excellent results, promptly under low pressure can realize grouting, can between soil body particle, realize infiltration grouting.

In addition, though since in continuous grouting for a long time so that hardened material is penetrated under the situation in the relative broad range once, the infiltrating area in grouting source is still wider, so also obtains the infiltration source and does not retrain the effect of sealing for gelinite.

Also have, because under the expansion of pocket, the filling periphery can be subjected to compacting widely, so also can obtain following effect, promptly has the filling effect greater than actual pocket, hardened material is difficult to cross filling and is lost in the pore-forming space, top.

Therefore, can obtain following effect, that is, even under the situation of continous pouring hardened material for a long time, hardened material still can not be lost to the system outside, can make the ground of relative broad range realize that permeability is fixed equably.

Thus, obtain following effect, promptly, can form the formed body that meets design once to all carrying out the perfusion of uniform hardened material.

In addition because the gross area diameter of the interior pipe inspection mouth in 1 step is less than the diameter of interior tube section area, shown in Fig. 9,10, guarantee like this to manage internal pressure more than authorized pressure (usually at 5kg/cm ²), even existing picture such as the hole of collapsing thus, under the situation that renitency changes, still can guarantee corresponding to the jet ejection of the hardened material of the ormal weight of outlet diameter from interior pipe, consequently, obtain following excellent results, promptly form the ground formed body that meets design at Overall Steps.

Have again, the pressure space between the filling that plugs of spacing according to the rules vertically in the annular gap of outer tube and interior pipe, pressure sensor is set, because the pressure of the hardened material of each pressure space can detect by lead on the ground, so just, obtain following excellent results, promptly press occupied state to detect, can confirm that hardened material is filled in the ground really the storage of the hardened material of pressure space.

In addition, because wad act etc. are good, above-mentioned like this provisions for grouting can adopt in ground and in the wide region, with the mode concentrated area that the time staggers grouting construction be carried out in every zone.

In addition, in ground is the wide region of conduct construction object, provisions for grouting carries out grouting construction with the mode concentrated area that while or time stagger to every zone, so just, obtain following excellent results, can be according to each the regional situation in this ground, carry out grouting construction, construction ability is good, and the duration also can change according to design.

Also have, because the sleeve mortar is not set, even in the relative renitency of the outlet opening of outer tube various variations take place like this, or the hole of collapsing now looks like, the discharge resistance changes, and then the outlet opening front of part because of the hole of collapsing now as situation about burying under, still can guarantee to eject, corresponding to a certain amount of hardened material emitted dose of pump pressure and jet diameter from the jet of the nozzle of interior pipe, thus, guarantee by the pore-forming space, in the length range of grout compartment, the hardened material infiltration of ormal weight is poured in the ground, therefore just obtain following effect, promptly, in ground, form the large-size that meets design, long formed body according to design.

The ground stabilization of Huo Deing has following effect in the manner described above, promptly not only can prevent aqueousization phenomenon, but also can obtain effect that various foundation dredging engineerings are reinforced fully, even in the construction of engineerings such as tunneling shield driving, just bring into play the effect of reinforcement material, even under the situations such as waterproof when tunnel excavation and reinforcing, still can bring into play bigger effect.

Have again, because in the pressure space that is formed between each filling, hardened material outlet opening from outer tube and the jet in the interior pipe are interconnected, so just, obtain following effect, even the outlet opening at outer tube is in closed condition, or under the bigger situation of occlusion resistance, still can guarantee of the jet ejection of a certain amount of hardened material from interior pipe, permeate grouting by pore-forming space to ground base.

In addition, it is less to be inserted into the diameter of inner pipe that the grouting liquid in the outer tube uses, and has been arranged side by side many, can obtain following excellent results like this, promptly allow the grouting liquid of biliquid formula by pipe in above-mentioned, thereby the grouting liquid of gel time that also can be by any adjusting make ground consolidation.

Because above-mentioned situation also can obtain following excellent results, promptly in the basement rock of ground, the large-size that formation is predetermined than long ground formed body.

In addition, because foundation grouting device of the present invention also can be constructed at every in ground zone in the concentrated area after realizing densification by each pocket expansion, so just, obtain following excellent results, promptly expeditiously the ground of large area region is carried out the regulation foundation stabilization construction.

Also have and since hardened material be along the vertical direction or incline direction once permeate and be filled in the ground such overall process, so just, obtain following excellent results, efficiency of construction is good, and management also is easy to, have high efficient, can shorten the construction period greatly.

Claims

1. foundation grouting device, it is characterized in that in this device, on the body that is provided with the pocket outer tube that can expand in chimeric mode by hardened material, offer a plurality of hardened material outlet openings vertically, portion axially offers a plurality of hardened material jets that formed by aperture along identical within it, and the interior pipe that a plurality of fillings are set in the mode that accompanies this jet is inserted in above-mentioned outer tube inside, a plurality of above-mentioned fillings are vertically in the space between inner and outer pipes, on the sleeve pipe of above-mentioned outer tube, be provided with 1 pocket at least, pocket lower side at this outer tube, offer at least 1 hardened material jet at least one hardened material outlet opening and in being somebody's turn to do between a plurality of fillings in the pipe, this hardened material outlet opening and hardened material jet keep being communicated with in spaced same space vertically mutually.

2. provisions for grouting, it is characterized in that this device has following interior pipe, should interior pipe insertion be provided with in the outer tube of a plurality of outlet openings, and hardened material is filled in the ground, in interior pipe, hardened material can be simultaneously from following a plurality of jet ejections, and in these a plurality of jets, at least 1 between at least 3 fillings of expanding by fluid.

3. device according to claim 1 in the space that it is characterized in that being provided with at interval, is provided with pressure sensor between above-mentioned filling.

4. foundation grouting job practices, it is characterized in that in the method, following outer tube is being inserted in the hole that is formed in the ground, this outer tube is provided with can be by the pocket of hardened material expansion, have a plurality of hardened material outlet openings in addition, a plurality of hardened material outlet openings from the body that is formed at this outer tube, hardened material is filled in the ground, by hardener above-mentioned pocket is expanded, above-mentioned pocket is on the hole wall that closely is fixed in above-mentioned pore-forming, and hardened material is from having the interior pipe ejection of a plurality of jets, thereby this hardened material is penetrated into the ground from the outlet opening of above-mentioned outer tube.