CN104060613B - The directed slip casting structure of interlocking pile and interlocking pile directed grouting and reinforcing soil body method - Google Patents
The directed slip casting structure of interlocking pile and interlocking pile directed grouting and reinforcing soil body method Download PDFInfo
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- CN104060613B CN104060613B CN201310093407.9A CN201310093407A CN104060613B CN 104060613 B CN104060613 B CN 104060613B CN 201310093407 A CN201310093407 A CN 201310093407A CN 104060613 B CN104060613 B CN 104060613B
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Abstract
The invention discloses the directed slip casting structure of a kind of interlocking pile, comprise the A stake for constructing interlocking pile piling wall and B stake, described B stake is built-in with circular reinforcing cage; Also comprise filling system, described filling system comprises grouting pump for exporting slurries, for carrying the grouting pipe of slurries and for direct slip casting efferent duct surrounding soil being carried out to compacting grouting and reinforcing, described grouting pump connects described slip casting efferent duct by described grouting pipe, some described slip casting efferent ducts are arranged in the circumferential lateral surface of the described reinforcing cage of described B stake, described slip casting efferent duct is provided with some slurry outlets, described slurry outlet, towards the side soil body that need reinforce, carries out grouting and reinforcing to the side soil body.The invention also discloses a kind of interlocking pile directed grouting and reinforcing soil body method.It is simple that the present invention has construction technology, and cost is low, easy to operate, easily reaches the feature of design effect, is specially adapted to periphery existing structure clear distance narrow and small, and the base pit engineering that conventional soil stabilization machinery cannot be constructed.
Description
Technical field
The present invention relates to the technical field of building foundation construction, particularly relate to the directed slip casting structure of a kind of interlocking pile and interlocking pile directed grouting and reinforcing soil body method.
Background technology
Continually developing and utilizing along with urban underground space, the underground space is faced with the situation of an inch of land is an inch of gold equally.In order to make underground space development maximize, the excavation of foundation pit degree of depth of construction work is more and more darker, and area is increasing.When underground space planning, the newly-built underground space is the existing underground space or adjacent foundation with periphery usually, and the soil body between the two is usually subject to the disturbance of engineering construction or weak soil that inherently mechanical property is not good, becomes the weak link of newly-built underground space bracing engineering.
For guaranteeing the safety of work progress, usually before excavation of foundation pit, need reinforce the affected soil body of adjacent structure periphery, soil stabilization generally adopts the construction technologies such as cement mixing method, but this mode adds cost and duration virtually.In recent years, the underground space maximizes to realize, and goes along with sb. to guard him and is often close to existing underground, superstructure, be even less than 1m.In narrow space like this, the construction equipment of soil stabilization is difficult to construction drill safety to stretch into the soil body that need reinforce, and more cannot organize work, become the hidden danger of engineering safety.
On the other hand, hole-drilling interlocking pile is the Construction Technology of Retaining Structure of a comparative maturity at home.Two pile center's distances that hole-drilling interlocking pile is adjacent are less than Single Pile footpath, and after therefore existing, the stake of construction is engaged the stake of first constructing.Interlocking pile divides square reinforcing cage (or plain concrete) A stake and circular reinforcing cage B stake.Sequence of construction is, A stake of first constructing, and B pile driving construction, rear, cut the concrete of A stake part and forms occlusion structure.After the concrete final set of interlocking pile appears at the occlusion of stake, become seamless continuous print " piling wall ".When interlocking pile is constructed, certain disturbance can be produced to the periphery soil body, make the soil body between interlocking pile and contiguous existing structure weaker, threaten safety during excavation of foundation pit, now need to reinforce the soil body part (i.e. the outer circumferential side soil body part of foundation ditch) between newly-built piling wall and existing structure.
Therefore, those skilled in the art is devoted to exploitation always a kind ofly can effectively reinforce the soil body between newly-built piling wall and existing structure, and the directed slip casting structure of interlocking pile that structure is simple, simple operation, required construction space are little, with low cost and interlocking pile directed grouting and reinforcing soil body method.
Summary of the invention
Because above-mentioned the deficiencies in the prior art, the present invention proposes a kind of can realization and carries out the directed slip casting structure of interlocking pile that slip casting effectively reinforces and interlocking pile directed grouting and reinforcing soil body method to the side soil body, and the present invention is especially applicable to reinforcing the long and narrow soil body between newly-built interlocking pile piling wall and existing underground structure.
For achieving the above object, the invention provides the directed slip casting structure of a kind of interlocking pile, comprising: for constructing A stake and the B stake of interlocking pile piling wall, described B stake is built-in with reinforcing cage.Wherein also comprise: for the filling system of directed slip casting, described filling system comprises grouting pump for exporting slurries, for carrying the grouting pipe of slurries and for direct slip casting efferent duct surrounding soil being carried out to compacting grouting and reinforcing, described grouting pump connects described slip casting efferent duct by described grouting pipe, some described slip casting efferent ducts are arranged in the circumferential lateral surface of the described reinforcing cage of described B stake, described slip casting efferent duct is provided with some slurry outlets, and described slurry outlet is towards the side soil body that need reinforce.
Adopt technique scheme, when soil stabilization, slurries pressurize from grouting pump to slurries, slurries lead to slip casting efferent duct by grouting pipe, slurries flow out from the slurry outlet slip casting efferent duct, to surrounding soil compacting grouting and reinforcing, the long and narrow soil body between very applicable reinforcing newly-built interlocking pile piling wall and existing structure, and structure is simple, simple operation, required construction space are little, with low cost.
As a further improvement on the present invention, described slip casting efferent duct is arc flexible pipe, described grouting pipe is communicated with arc flexible pipe described in each simultaneously, some described arc flexible pipe horizontal arrangement at described reinforcing cage towards in the circumferential lateral surface need reinforcing the side soil body, the two-port of described arc flexible pipe is closed, and described slurry outlet is arranged on described arc flexible pipe towards on the tube wall need reinforcing the side soil body.Adopt arc flexible pipe multiple-layer horizontal to arrange, can better and reinforcing cage adaptation, and can realize carrying out reinforcing operation to the multiple section of the side soil body.
As a further improvement on the present invention, described grouting pipe is provided with and makes slurries can only the grouting valve of one-way flow, described grouting valve can adopt non retern valve, further increases structural reliability of the present invention.
The present invention also proposes a kind of interlocking pile directed grouting and reinforcing soil body method, comprises the following steps:
Step one: the reinforcing cage of prefabricated B stake.
Step 2: be provided with for carrying the grouting pipe of slurries and for direct some slip casting efferent ducts surrounding soil being carried out to compacting grouting and reinforcing in the circumferential lateral surface of described reinforcing cage, described grouting pipe is connected with the conducting of described some slip casting efferent ducts, and the tube wall of described slip casting efferent duct is provided with some slurry outlets.
Step 3: construct A stake, completes the construction of B stake stake holes simultaneously.
Step 4: hung in described B stake stake holes by the reinforcing cage being provided with described grouting pipe and described slip casting efferent duct, makes described slurry outlet towards the side soil body that need reinforce.
Step 5: build B stake, after B stake reaches predetermined strength, at the grouting port access grouting pump of described grouting pipe, starts grouting pump, slurries is delivered to slurry outlet and directly carries out compacting grouting and reinforcing to the side soil body that need reinforce.
Therefore, carry out construction according to above-mentioned steps and can construct out the directed slip casting structure of described interlocking pile, and complete the consolidation grouting operation to the side soil body.There is operating process simple and convenient, required with low cost, the advantage that consolidation effect is good.
As a further improvement on the present invention, the slurry outlet of described slip casting efferent duct is coated with the covering layer preventing sand from pouring in down a chimney, further raising reliability of the present invention.
As a further improvement on the present invention, described grouting pipe connects slip casting efferent duct described in conducting by grouting valve, further increases reliability of the present invention and operability.
As a further improvement on the present invention, described slurries are P.042.5 class g cement slurries, the water/binder ratio of described slurries is 0.55-0.6, and the slurries configured are before injection through wet milk micronization processes and through strainer filtering, described filter screen mesh is less than 40 μm, further increases construction effect of the present invention.
As a further improvement on the present invention, described step 5 is the current of 0.8-1.2MPa at the grouting port cut-in pressure of described grouting pipe in also comprising 7-8 hour after building B stake pile, carries out clear water and opens plug, stop water filling after opening plug.Above-mentionedly open plug operation and can slurry outlet be avoided timely and effectively to be blocked by sandstone, and action can be broken to covering layer, be convenient to follow-up slip casting operation, improve operating efficiency and functional reliability further.
As a further improvement on the present invention, described step 5 carries out slip casting operation in after should not being later than pile 30 days at B stake pile after 2 days, and grouting pressure is 0.2-0.3MPa, injection speed is 10-15L/min.
As further supplementary notes of the present invention, the directed slip casting structure of interlocking pile of the present invention and interlocking pile directed grouting and reinforcing soil body method, can according to the character of required soil mass consolidation and reinforcing area, when designing, the arrangement of slip casting efferent duct, spacing and grouting amount being adjusted, after reinforcing, reaching the designing requirement of soil strength.Slip casting efferent duct pre-buried in B stake, reserved and under hang time should strictly carry out according to Design Orientation, the slurry outlet of the grouting behind shaft or drift lining efferent duct that prevents from misplacing is closed in interlocking pile A stake, cannot pulp.For improving the success rate of mud jacking, can at A stake pile after 12 hours, to the splitting of grouting equipment clear water.
In sum, the directed slip casting structure of interlocking pile of the present invention and interlocking pile directed grouting and reinforcing soil body method, when soil stabilization, slurries pressurize from grouting pump to slurries, slurries lead to slip casting efferent duct by grouting pipe, slurries flow out from the slurry outlet slip casting efferent duct, to surrounding soil compacting grouting and reinforcing, the long and narrow soil body between very applicable reinforcing newly-built interlocking pile piling wall and existing structure, effectively can overcome the defect of soil body weakness between interlocking pile and contiguous existing structure, can soil mass consolidation easily and effectively by applying slip casting structure of the present invention and soil mass consolidation method, improve security reliability during excavation of foundation pit greatly, and structure of the present invention is simple, simple operation, required construction space is little, with low cost.
Be described further below with reference to the technique effect of accompanying drawing to design of the present invention, concrete structure and generation, to understand object of the present invention, characteristic sum effect fully.
Accompanying drawing explanation
Fig. 1 is the floor map of the directed slip casting structure of interlocking pile.
Fig. 2 is the A-A sectional schematic diagram of the directed slip casting structure of Fig. 1 interlocking pile.
Fig. 3 is the schematic process flow diagram of interlocking pile directed grouting and reinforcing soil body method.
Detailed description of the invention
Embodiment one:
Fig. 1 is the floor map of the directed slip casting structure of interlocking pile.The present embodiment proposes the directed slip casting structure of a kind of interlocking pile, comprises the reinforcing cage 3 being built-in with circle for the A stake 1 and B stake 2, B stake 2 of constructing interlocking pile piling wall shown in Fig. 1.
Fig. 2 is the A-A sectional schematic diagram of the directed slip casting structure of Fig. 1 interlocking pile.Shown in composition graphs 1 and Fig. 2, the directed slip casting structure of interlocking pile of the present embodiment, also comprise the filling system for directed slip casting, described filling system comprises the grouting pump 4 for exporting slurries, for carrying the grouting pipe 5 of slurries and for the direct slip casting efferent duct 6 surrounding soil being carried out to compacting grouting and reinforcing, grouting pump 4 connects slip casting efferent duct 6 by grouting pipe 5, some slip casting efferent ducts 6 are arranged in the circumferential lateral surface of reinforcing cage 3 of B stake 2, slip casting efferent duct 6 is provided with some slurry outlet (not shown)s, described slurry outlet is towards the side soil body that need reinforce, namely towards existing structure 7 side, exemplary, slurries can spray to by slurry outlet the soil body that existing structure 7 side need reinforce along the direction of arrow in Fig. 1 and Fig. 2.
As the further detailed description of the invention of the present embodiment, slip casting efferent duct 6 is arc flexible pipe, grouting pipe 5 is communicated with arc flexible pipe described in each simultaneously, some described arc flexible pipe horizontal arrangement at reinforcing cage towards in the circumferential lateral surface need reinforcing the side soil body (namely towards existing structure 7 side), the two-port of described arc flexible pipe is closed, and described slurry outlet is arranged on described arc flexible pipe towards on the tube wall need reinforcing the side soil body (namely towards existing structure 7 side).Exemplary, the present embodiment can adopt three arc flexible pipes and circular reinforcing cage to carry out three interlayers and arrange every same level, well achieves and carries out grouting and reinforcing operation to the side soil body three sections.Of course, in other embodiments, also can adopt slip casting efferent duct 6 and the grouting pipe 5 of other types and quantity, carry out suitable layout as required simultaneously.
As the further detailed description of the invention of the present embodiment, for further increasing structural reliability of the present invention, grouting pipe 5 is also provided with and makes slurries can only the grouting valve (not shown) of one-way flow, exemplary, the grouting valve described in the present embodiment be non retern valve.Concrete, described grouting valve can be one, is arranged between grouting pipe and grouting pump; Also can be that each root slip casting efferent duct 6 adaptive configures a described grouting valve, described grouting valve one end connects grouting pipe 5, and the other end connects slip casting efferent duct 6.Of course, in other embodiments, also can adopt the grouting valve of other types and quantity, carry out suitable layout as required simultaneously.
Adopt the directed slip casting structure of the interlocking pile of the present embodiment, when soil stabilization, slurries pressurize from grouting pump to slurries, slurries lead to slip casting efferent duct by grouting pipe, slurries flow out from the slurry outlet slip casting efferent duct, realize surrounding soil compacting grouting and reinforcing, are especially applicable to reinforcing the long and narrow soil body between newly-built interlocking pile piling wall and existing structure, and structure is simple, simple operation, required construction space are little, and greatly reduce difficulty of construction and cost.Due to the Construction Technology of Retaining Structure that hole-drilling interlocking pile is a comparative maturity at home, for A stake and B stake specifically build and the moulding process of piling wall is the general prior art in this area, those of ordinary skill in the art can apparently construct, and do not repeat them here.
Embodiment two:
Fig. 3 is the schematic process flow diagram of interlocking pile directed grouting and reinforcing soil body method.The present embodiment proposes a kind of interlocking pile directed grouting and reinforcing soil body method, as Figure 1-3, comprises the following steps:
Step S1: the reinforcing cage 3 of prefabricated B stake 2.
Step S2: be provided with for carrying the grouting pipe 5 of slurries and for the direct some slip casting efferent ducts 6 surrounding soil being carried out to compacting grouting and reinforcing in the circumferential lateral surface of reinforcing cage 3, grouting pipe 5 is connected with the conducting of some slip casting efferent ducts 6, and the tube wall of slip casting efferent duct 6 is provided with some slurry outlets.
Step S3: construct A stake 1, completes the construction of B stake stake holes simultaneously.
Step S4: hung in described B stake stake holes by the reinforcing cage 3 being provided with grouting pipe 5 and slip casting efferent duct 6, makes described slurry outlet towards the side soil body that need reinforce (namely towards existing structure 7 side).The grouting port of grouting pipe 5 is arranged on described B stake stake holes outer (namely basset, facilitate follow-up connection grouting pipeline) simultaneously.
Step S5: build B stake 2, after B stake 2 reaches predetermined strength, at the grouting port access grouting pump 4 of grouting pipe 5, start grouting pump 4, slurries are delivered to slurry outlet and directly compacting grouting and reinforcing (as indicated by arrows in fig. 1 and fig. 2, carrying out grouting and reinforcing to the soil body long and narrow between interlocking pile piling wall and existing structure) are carried out to the side soil body that need reinforce.
Therefore, to carry out constructing the directed slip casting structure of interlocking pile can constructing out as depicted in figs. 1 and 2 described in embodiment one according to above-mentioned steps, and slurries complete the consolidation grouting operation to the side soil body along the direction of arrow in Fig. 1 and Fig. 2.Because the occlusal position of A stake and B stake can not permeate slurries, therefore slurries all enter the side soil body that need reinforce, and decrease running pulp, alter the possibility of slurry, reduce waste.The quality control of slip casting can take the method for grouting amount and grouting pressure dual control, and usual mud jacking amount is main, and pumping pressure is auxiliary.Therefore operating process is simple and convenient, required with low cost, consolidation effect is good.The soil mass consolidation method of the present embodiment directly can adopt the directed slip casting structure of the interlocking pile described in embodiment one, it is a kind of embody rule of embodiment one, constructing whole piling wall, and after between piling wall and existing structure, the grouting and reinforcing intensity of the long and narrow soil body reaches designing requirement, can the relieved excavation carrying out foundation ditch 8.
As the further detailed description of the invention of the present embodiment, the slurry outlet of slip casting efferent duct 6 also can be coated with the covering layer (not shown) preventing sand from pouring in down a chimney, exemplary, covering layer in the present embodiment can adopt adhesive plaster or rubber parcel to cover slurry outlet, slurry outlet is made to be in closed state, prevent sand from being poured in down a chimney in slip casting efferent duct 6 by outside, and covering layer can be washed when pulp open by slurries and recover conducting state, further raising reliability of the present invention.
As the further detailed description of the invention of the present embodiment, the present embodiment is at reinforcing cage 3 circumferential lateral surface horizontal arrangement three slip casting efferent ducts 6 be parallel to each other of circle, a grouting valve is configured again for each root slip casting efferent duct 6, grouting pipe 5 connects conducting slip casting efferent duct 6 by grouting valve, be specially grouting valve one end and connect grouting pipe 5, the other end connects slip casting efferent duct 6, and exemplary, the grouting valve of the present embodiment is non retern valve.Of course, in other embodiments, also can adopt the grouting valve of other types and quantity, carry out suitable layout as required simultaneously.
As the further detailed description of the invention of the present embodiment, the slurries that the present embodiment adopts are P.042.5 class g cement slurries, and the water/binder ratio of described slurries is 0.55-0.6, and exemplary water/binder ratio can adopt 0.55 or 0.58 or 0.6.And the slurries configured are before injection through wet milk micronization processes and through strainer filtering, described filter screen mesh is less than 40 μm, and exemplary described filter screen mesh used heat diameter can adopt 10 μm or 20 μm or 30 μm or other sizes being less than 40 μm.
As the further detailed description of the invention of the present embodiment, in described step S5 also comprises 7-8 hour after building B stake 2 pile, be that (exemplary adopts in 7 or 8 hours after building B stake pile for the current of 0.8-1.2MPa at the grouting port cut-in pressure of grouting pipe 5, the grouting port cut-in pressure of grouting pipe 5 be 0.8 or the current of 1.2MPa carry out clear water and open plug), stop water filling after opening plug.Above-mentionedly open plug operation and can slurry outlet be avoided timely and effectively to be blocked by sandstone, and action can be broken to covering layer, be convenient to follow-up slip casting operation, improve operating efficiency and functional reliability further.
Within after pile should not being later than 30 days, slip casting operation is carried out after 2 days again at B stake 2 pile, parameters: grouting pressure is 0.2-0.3MPa, injection speed is that 10-15L/min(is exemplary, after 2 days or 15 days or 30 days, can carry out slip casting operation at B stake pile, arranging grouting pressure is 0.2 or 0.3MPa, injection speed be 10 or 15L/min), finally start grouting pump 4, slurries are delivered to slurry outlet and directly compacting grouting and reinforcing are carried out to surrounding soil, complete soil mass consolidation operation.
The present embodiment, after A stake 1 and B stake 2 are engaged pile, carries out one-sided directed cement injection by slip casting efferent duct 6 to the soil body that existing structure 7 side need reinforce, and cement grout infiltrates the hole in soil layer, reaches the effect improving soil strength.The present embodiment according to soil layer situation and reinforcement criteria, by the increase and decrease vertical spacing of slip casting efferent duct and grouting amount, can realize designing requirement.It is simple that the present embodiment has construction technology, and cost is low, easy to operate, easily reaches the feature of design effect, is specially adapted to periphery existing structure clear distance narrow and small, and the base pit engineering that conventional soil stabilization machinery cannot be constructed.
More than describe preferred embodiment of the present invention in detail.Should be appreciated that those of ordinary skill in the art just design according to the present invention can make many modifications and variations without the need to creative work.Therefore, all technician in the art, all should by the determined protection domain of claims under this invention's idea on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (9)
1. the directed slip casting structure of interlocking pile, comprise the A stake for constructing interlocking pile piling wall and B stake, described B stake is built-in with reinforcing cage; It is characterized in that, also comprise: for the filling system of directed slip casting, described filling system comprises grouting pump for exporting slurries, for carrying the grouting pipe of slurries and for direct slip casting efferent duct surrounding soil being carried out to compacting grouting and reinforcing, described grouting pump connects described slip casting efferent duct by described grouting pipe, some described slip casting efferent ducts are arranged in the circumferential lateral surface of the described reinforcing cage of described B stake, described slip casting efferent duct is provided with some slurry outlets, and described slurry outlet is towards the side soil body that need reinforce;
Described slip casting efferent duct is arc flexible pipe, described grouting pipe is communicated with arc flexible pipe described in each simultaneously, some described arc flexible pipe horizontal arrangement at described reinforcing cage towards in the circumferential lateral surface need reinforcing the side soil body, the two-port of described arc flexible pipe is closed, and described slurry outlet is arranged on described arc flexible pipe towards on the tube wall need reinforcing the side soil body.
2. the directed slip casting structure of interlocking pile as claimed in claim 1, is characterized in that: described grouting pipe is provided with and makes slurries can only the grouting valve of one-way flow.
3. the directed slip casting structure of interlocking pile as claimed in claim 2, is characterized in that: described grouting valve is non retern valve.
4. an interlocking pile directed grouting and reinforcing soil body method, is characterized in that: comprise the following steps:
Step one: the reinforcing cage of prefabricated B stake;
Step 2: be provided with for carrying the grouting pipe of slurries and for direct some slip casting efferent ducts surrounding soil being carried out to compacting grouting and reinforcing in the circumferential lateral surface of described reinforcing cage, described grouting pipe is connected with the conducting of described some slip casting efferent ducts, and the tube wall of described slip casting efferent duct is provided with some slurry outlets;
Step 3: construct A stake, completes the construction of B stake stake holes simultaneously;
Step 4: hung in described B stake stake holes by the reinforcing cage being provided with described grouting pipe and described slip casting efferent duct, makes described slurry outlet towards the side soil body that need reinforce;
Step 5: build B stake, after B stake reaches predetermined strength, at the grouting port access grouting pump of described grouting pipe, starts grouting pump, slurries is delivered to slurry outlet and directly carries out compacting grouting and reinforcing to the side soil body that need reinforce.
5. interlocking pile as claimed in claim 4 directed grouting and reinforcing soil body method, is characterized in that: the slurry outlet of described slip casting efferent duct is coated with the covering layer preventing sand from pouring in down a chimney.
6. interlocking pile as claimed in claim 4 directed grouting and reinforcing soil body method, is characterized in that: described grouting pipe connects slip casting efferent duct described in conducting by grouting valve.
7. interlocking pile as claimed in claim 4 directed grouting and reinforcing soil body method, it is characterized in that: described slurries are P.042.5 class g cement slurries, the water/binder ratio of described slurries is 0.55-0.6, and the slurries configured are before injection through wet milk micronization processes and through strainer filtering, described filter screen mesh is less than 40 μm.
8. interlocking pile as claimed in claim 5 directed grouting and reinforcing soil body method, it is characterized in that: in described step 5 also comprises 7-8 hour after building B stake pile, be the current of 0.8-1.2MPa at the grouting port cut-in pressure of described grouting pipe, carry out clear water and open plug, after opening plug, stop water filling.
9. the directed grouting and reinforcing soil body of the interlocking pile as described in claim as arbitrary in claim 4-8 method, it is characterized in that: described step 5 carries out slip casting operation in after should not being later than pile 30 days at B stake pile after 2 days, grouting pressure is 0.2-0.3MPa, and injection speed is 10-15L/min.
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| CN201310093407.9A CN104060613B (en) | 2013-03-22 | 2013-03-22 | The directed slip casting structure of interlocking pile and interlocking pile directed grouting and reinforcing soil body method |
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| CN201310093407.9A CN104060613B (en) | 2013-03-22 | 2013-03-22 | The directed slip casting structure of interlocking pile and interlocking pile directed grouting and reinforcing soil body method |
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| CN104060613B true CN104060613B (en) | 2016-04-20 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106480879A (en) * | 2016-02-15 | 2017-03-08 | 王郁东 | A kind of prestressed concrete Quincunx tubular pile |
| CN109518698B (en) * | 2018-12-20 | 2023-11-17 | 中铁二院工程集团有限责任公司 | Water-rich deep foundation pit support structure close to operating high-iron sand pebble layer and construction method thereof |
| CN112538850B (en) * | 2020-12-03 | 2022-10-04 | 中建市政工程有限公司 | Device and method suitable for advanced grouting of pipe gallery for tree protection |
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| DE4013801A1 (en) * | 1990-04-28 | 1991-11-07 | Keller Grundbau Gmbh | Consolidation of loose soil - by injecting liq. cement into soil with aid of compressed air |
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