CN108914940A - A kind of multiple superhigh pressure jetting grouting construction method of super-large diameter - Google Patents
A kind of multiple superhigh pressure jetting grouting construction method of super-large diameter Download PDFInfo
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- CN108914940A CN108914940A CN201810712889.4A CN201810712889A CN108914940A CN 108914940 A CN108914940 A CN 108914940A CN 201810712889 A CN201810712889 A CN 201810712889A CN 108914940 A CN108914940 A CN 108914940A
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- whitewashing
- drilling tool
- mud
- slurry
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/003—Injection of material
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0053—Production methods using suction or vacuum techniques
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a kind of multiple superhigh pressure jetting grouting construction methods of super-large diameter, include the following steps：Pilot hole is being carried out using pilot hole drilling machine to slip casting point；After pore-forming, the drilling tool of whirl spraying machinery is transferred to bottom hole, there are two section of whitewashing, respectively upper whitewashing section and lower whitewashing sections for the lower end tool of drilling tool；Run that whirl spraying is mechanical, it is upper mention drilling tool while so that upper whitewashing section thereon and lower whitewashing section is distinguished outside gunite, with the formation whirl spraying pile body around drilling tool.It is an advantage of the invention that：Using section and the lower whitewashing section of whitewashing in setting on drilling tool, by carrying out cement slurry injection during drilling tool above proposes, the cement slurry of injection can be made to carry out cutting dilution to mud, while forming the whirl spraying pile body of reliable in quality around drilling tool, the stabilization of pressure, guarantees whitewashing quality and efficiency effectively in control ground.
Description
Technical field
The invention belongs to foundation construction technical fields, and in particular to a kind of multiple superhigh pressure jetting mortar depositing construction of super-large diameter
Method.
Background technique
In existing High-Pressure Grouting Method work progress, mud is naturally drained on the ground by the gap on drilling rod periphery.
But it is highly difficult for the spoil disposal operation of ground depths, because of the drilling rod at ultra-deep and pressure increasing in the ground of high pressure spray loophole surrounding
Greatly, it frequently can lead to ejection efficiency decline, therefore, consolidation effect and reliability reduce.In addition, in the construction process, ground internal pressure
Power increases, and will lead to peripheral ground protuberance.
MJS engineering method (Metro Jet System) is also known as comprehensive high-pressure injection engineering method, and MJS engineering method is in existing high pressure spray
It penetrates on the basis of grouting process, causes device to execute using antipriming pipe and front end and force pressure monitoring in plasma discharge and ground in hole, and
By adjusting forcing plasma discharge amount to control pressure in ground, controls pressure in depths spoil disposal and ground rationally, make pressure in ground
Stablize, reduce and occur a possibility that earth's surface deformation in construction, the influence to environment is greatly reduced, and in ground pressure drop
It is low also to further ensure expanded diameter.
But in actual site operation, it is easy to be blocked by biggish soil block during spoil disposal, since mud density is larger
Also it be easy to cause mud suction mouth to block, causes spoil disposal unsmooth, influence construction quality and construction speed.
It needs to provide a kind of multiple superhigh pressure jetting grouting construction method of super-large diameter thus, effectively controls pressure in ground
Stablize, spoil disposal is made to reach optimum efficiency.
Summary of the invention
According to the deficiencies of the prior art described above, It is an object of the present invention to provide a kind of multiple super-pressure sprays of super-large diameter
Grouting construction method is penetrated, which carries out cement slurry injection simultaneously by upper whitewashing section and lower whitewashing section, to reach dilute
Mud density around is released, avoids biggish soil block to the influence of construction, so that spoil disposal is reached optimum efficiency, while effectively in control ground
The stabilization of pressure, to form whirl spraying pile body around drilling tool.
The object of the invention realization is completed by following technical scheme：
A kind of multiple superhigh pressure jetting grouting construction method of super-large diameter, includes the following steps：It is being bored to slip casting point using pilot hole
Machine carries out pilot hole；After pore-forming, the drilling tool of whirl spraying machinery is transferred to bottom hole, whitewashing section that there are two the lower end tools of the drilling tool,
Respectively upper whitewashing section and lower whitewashing section；Run that the whirl spraying is mechanical, it is upper mention the drilling tool while make on thereon described
Section of whitewashing and the lower whitewashing section distinguish outside gunite, to form whirl spraying pile body around the drilling tool.
During the pilot hole of the pilot hole drilling machine, steel pile casting is set at layer of sand, rubble stratum or the boulder bed encountered and is carried out
Retaining wall.
After the pilot hole drilling machine completes pilot hole and the drilling rod of extraction thereon, thin-walled pilot hole Guan Zhishe is set in the hole
Depth is counted, the thin-walled pilot hole pipe can be crashed to pieces under the cement slurry jet-action of the two whitewashing sections.
During the drilling tool above mentions, the upper whitewashing section horizontally outward gunite with by drilling tool periphery
Mud be diluted and mud be discharged, postinjection cement slurry continues remaining mud to the lower whitewashing section horizontally outward
Discharge, so that the cement slurry that whirl spraying goes out forms whirl spraying pile body around the drilling tool.
Above mentioned in the drilling tool and while gunite horizontally outward, using be located at the upper whitewashing section with it is described under
Slurry section of returning between whitewashing section carries out vacuum spoil disposal slurry.
It is using the method for returning slurry section progress vacuum spoil disposal slurry：It is provided with a vacuum in the drilling tool and returns to starch and leads to
Road, the vacuum return the pulp returning port opened up on slurry channel and the drilling tool outer wall and are connected, and the vacuum returns slurry channel for mud
Slurry is through in the pulp returning port pump drainage to the mud conditioning pond resting on the ground.
The vacuum return slurry channel pump drainage mud during, be set to vacuum return slurry channel in a spray nozzle to
The conveying direction of its interior mud is sprayed water, to improve the mobility of mud.
The upper whitewashing section and the lower whitewashing section during horizontal-jet cement slurry, the upper whitewashing section with it is described
Lower whitewashing segment sync sprays pressure-air horizontally outward, to carry out cutting and crushing to the soil body around the drilling tool.
It is above mentioned in the drilling tool and while gunite horizontally outward, the soil body around the drilling tool is pressed with carrying out
Test.
It is provided with horizontally nozzle A in the upper whitewashing section, is provided with the nozzle tilted upward in the lower whitewashing section
B adjusts the upward tilt angle of the nozzle B according to the design diameter of the required whirl spraying pile body applied in advance；Described
During being mentioned on drilling tool, the upper whitewashing section by the nozzle A horizontally outward gunite to cut the dilution soil body, institute
It states lower whitewashing section and gunite is tilted upward by the nozzle B, two strands of cement slurries are intersected at design diameter position,
To form the whirl spraying pile body of design diameter around the drilling tool.
It is an advantage of the invention that：（1）Whitewash in setting on drilling tool section and lower whitewashing section, by during drilling tool above mentions into
The injection of row cement slurry, can make the cement slurry of injection carry out cutting dilution to mud, while forming reliable in quality around the drilling tool
Whirl spraying pile body, effectively control the stabilization of pressure in ground, guarantee whitewashing quality and efficiency；（2）By utilizing the upper spray on drilling tool
Slurry section can carry out cutting to the soil body and form mud, and carry out vacuum pump drainage mud using slurry section is returned, so that mud contamination is few, simultaneously
The regulation of interior pressure over the ground decreases the phenomenon that mud " altering " enters soil, water body or underground piping；（3）High-pressure injection note
The influence starched in work progress for surrounding enviroment is smaller, and ultra-deep construction is guaranteed.
Detailed description of the invention
Fig. 1 is the structure composition schematic diagram of each functional section in drilling tool lower end in the present invention；
Fig. 2 is the structural schematic diagram of upper whitewashing section in the present invention；
Fig. 3 is that direct absorbing type returns slurry segment structure schematic diagram in the present invention；
Fig. 4 is that flush-type returns slurry segment structure schematic diagram in the present invention；
Fig. 5 is the structural schematic diagram of lower whitewashing section in the present invention；
Fig. 6 is the construction procedure schematic diagram for carrying out pilot hole in the present invention using pilot hole drilling machine；
Fig. 7 is the status diagram that drilling tool carries out initial gunite work in the present invention；
Fig. 8 carries out whitewashing for drilling tool in the present invention and applies the construction schematic diagram to form whirl spraying pile body；
Fig. 9 is the schematic diagram that whirl spraying pile body applies completion in the present invention.
Specific embodiment
Feature of the invention and other correlated characteristics are described in further detail by embodiment below in conjunction with attached drawing, with
Convenient for the understanding of technical staff of the same trade：
Such as Fig. 1-9, figure acceptance of the bid note is respectively：Upper whitewashing section 1；Whitewashing section ontology 101；Whitewashing channel 102；Nozzle 103, upper whitewashing
The nozzle 103a of section；The nozzle 103b of lower whitewashing section；Air flue 104；Gas cap 105；Return slurry section 2；Pulp returning port 201；It is logical that vacuum returns slurry
Road 202；Return slurry section ontology 203；Day word baffle 204；High pressure aquaporin 205；Suck-back water opening valve 206；Press test section 3 in ground；Under
Whitewashing section 4；Drill bit 5；Pilot hole drilling machine 6；Whirl spraying mechnisiam；Mud pit 8；Drilling tool 9；Sludge pipe 10；Whirl spraying pile body 11；Compressed air
12；Cement slurry 13.
Embodiment：As shown in figs 1-9, the present embodiment is specifically related to a kind of multiple superhigh pressure jetting mortar depositing construction of super-large diameter
Method, the construction method mainly pass through 1 pair of soil body of upper whitewashing section set by 9 lower end of drilling tool and carry out cutting and mud dilution simultaneously
Vacuum pump drainage is carried out using slurry 2 pairs of mud of section are returned, while being sprayed using the outside gunite of lower whitewashing section 4 with whitewashing section 1 is closed
Cement slurry out around drilling tool to form whirl spraying pile body 11.Above-mentioned gunnite method can guarantee whitewash quality and efficiency, have
Effect ground constructs stable whirl spraying pile body 11 around and below drilling tool 9.
As illustrated in figures 1 and 7, before construction method in the present embodiment, prepare to need to be installed on 9 lower end of drilling tool at that time in advance
The multi-function head in portion, the multi-function head from top to bottom successively include upper whitewashing section 1, return starch section 2, press test section 3, lower whitewashing section
4 and drill bit 5.
As shown in Figure 2 and Figure 5, the structure of upper whitewashing section 1 and lower whitewashing section 4 is essentially identical, and difference is only that nozzle 103
Eject position it is not identical.The structure of upper whitewashing section 1 and lower whitewashing section 4 is all made of whitewashing section ontology 101, in whitewashing section ontology
Nozzle 103 is set on 101, and horizontally outward, the nozzle 103b of lower whitewashing section 4 is tilted upward the nozzle 103a of upper whitewashing section 1, upper spray
The nozzle 103b of the nozzle 103a and lower whitewashing section 4 that starch section 1 are located in same vertical lines, and nozzle 103 is with setting respective
The whitewashing channel 102 whitewashed in section ontology 101 connects, to spray conveying high-pressure cement slurry to construction target, in addition, whitewashing section
The corresponding position of each nozzle 103 on ontology 101 is additionally provided with gas cap 105, and gas cap 105 is connected with air flue 104, in gas
Gas cap 105 can be opened when exporting compressed air 12 and convey compressed air 12 outward by road 104.Above-mentioned upper whitewashing section 1 is under
In practice of construction operation, high pressure water mud 13 is input to from nozzle 103 from the external world by channel 102 of whitewashing section 4 of whitewashing, and is passed through
The constraint of nozzle 103 sprays high pressure water mud with preset injection direction.Upper whitewashing section 1 sprays 13 level of high pressure water mud
It penetrates, effect is cut the soil block in construction environment for mud, while diluting already present mud, in reduction construction environment
Concentration of hydraulic mixture improves the concentration of cement slurry 13, improves the formation efficiency of whirl spraying pile body 11.Lower whitewashing section 4 is by high pressure water mud
The high pressure water mud 13 of 13 upward injections and upper whitewashing section 1 mutually crosses, and increases the output quantity of cement slurry, further improves
The formation efficiency of whirl spraying pile body 11.The compressed air 12 conveyed at gas cap 105 further cuts soil, improves whitewashing
Shear action of the section main body 101 to soil, while also there is the injection direction of constraint high pressure water mud 13, enhance cement slurry 13
Actual ejection effect.It should be noted that according to the actual situation, set nozzle 103b is also possible in lower whitewashing section 4
It is horizontally disposed.
As shown in figure 3, returning slurry section 2 includes returning slurry section ontology in cylindrical shape, returns and offered on the outer wall of slurry section ontology
One pulp returning port 201, the pulp returning port 201 return slurry channel 202 with vacuum and are connected, and the soil block or stone of major diameter are inhaled in order to prevent
Enter vacuum return slurry channel 202 within, a day word baffle 204 is additionally provided at pulp returning port 201, naturally it is also possible to be latticed or its
It limits the structure of large-size particles.Vacuum returns the pulp returning port 201 opened up on slurry channel 202 and drilling tool outer wall and is connected, very
Sky returns slurry channel 202 for mud through in 201 pump drainage of pulp returning port to the mud conditioning pond 8 resting on the ground.Return the water that slurry section 2 sucks
Mud is by upper whitewashing section 1 and lower whitewashing section 4 treated mud, and it is suitable in pipeline which, which has better mobility,
Middle flowing.
As shown in figure 4, returning the transportation performance starched in channel 202 for mud to promote vacuum into one, returned in vacuum
The top portion in slurry channel 202 is provided with a suck-back water opening valve 206, and the spray nozzle face in the suck-back water opening valve 206 is true
Sky returns slurry channel, and the same high pressure aquaporin 205 of suck-back water opening valve 206 is connected, and suck-back water opening valve 206 can be by high pressure
High pressure water in aquaporin 205 is sprayed along the conveying direction of mud, returns the flowing in slurry channel 202 in vacuum to improve mud
Property.
As shown in Figs. 1-5, underground test section 3 is mainly used for testing the pressure of its surrounding soil, and the soil that will be monitored
Body pressure signal is transmitted to ground by signal transmssion line.The control device on ground is according to the pressure of the real-time soil body to upper whitewashing
Section 1 and it is lower whitewashing section 4 cement slurry injection pressure and return slurry 2 ground vacuum of section return starch channel 202 suction and suck-back water open
The water flow for opening valve 206 is adjusted in real time.When the pressure of the soil body is bigger than normal, injection pressure and the suction to mud are increased,
With the water flow for increasing the injection of suck-back water opening valve 206；Conversely, reducing injection pressure and to mud when the pressure of the soil body is less than normal
Suction, reduce suck-back water opening valve 206 spray water flow.
As shown in Fig. 1, Fig. 7-9, drill bit 5 is set to the front end of drilling tool 9, is mainly used for transferring in drilling tool 9 to pilot hole mistake
Guiding or drilling in journey.
As shown in figs 1-9, controlled diameter high pressure jet grouting construction method specifically includes following steps in the present embodiment：
（1）As shown in fig. 6, determining the center of slip casting point, pilot hole is carried out using pilot hole drilling machine 6, to pilot hole to projected depth
The drilling rod of pilot hole drilling machine 6 is pulled out afterwards；It may collapse during pilot hole, when if encountering layer of sand, rubble stratum or boulder bed
Hole, therefore cylinder-wall protecting need to be set when carrying out pilot hole to these stratum；And these may cause with the hole of collapse hole, it is pulling out
Thin-walled pilot hole pipe, e.g. Thin-Wall PVC pipe are set in hole after the drilling rod of pilot hole drilling machine, and above-mentioned thin-walled pilot hole Guan Yingke is in height
It presses and is crushed under the impact of cutting water, to not influence subsequent water cut and mud injection；
（2）As Figure 7-8, after pilot hole to be done, whirl spraying mechnisiam is mobile in place, according to the required whirl spraying pile body 11 applied
Design diameter, the angle for adjusting the nozzle 103b of the lower whitewashing section 4 on drilling tool 9 to whitewash section 1 and lower whitewashing section 4 spray
Cement slurry is intersected at design diameter position, to form the whirl spraying pile body 11 of design diameter around drilling tool 9.Complete lower spray to be regulated
After the nozzle 103b for starching section 4, by the decentralization of drilling tool 9 of whirl spraying mechnisiam to bottom hole；
（3）As Figure 8-9, it runs whirl spraying mechnisiam and rotates and above mention drilling tool 9, during drilling tool 9 above mentions, be located at drilling tool 9
The upper whitewashing section 1 of multi-function head topmost sprays high pressure water mud 13 and compressed air 12 outward first, to the soil of 9 periphery of drilling tool
Body is cut in advance, reduces the loss of the spray operation cutting soil body, and cement slurry 13 is diluted the mud in the soil body,
Drilling tool ambient earth, water, ratio shared by soil in cement slurry are reduced when its dilution effect.Wherein, high pressure water mud 13 and pressure
Effective sprayed fiber concrete of contracting air 12 controls within the scope of the design diameter of whirl spraying pile body 11.
After soil cutting is diluted to mud by upper whitewashing section 1,2 pairs of section of slurry is returned positioned at upper 1 lower section of whitewashing section
Mud carries out vacuum pump drainage, that is, under vacuum suction effect, mud returns slurry channel 202, vacuum into vacuum through pulp returning port 201
Return slurry 202 top portion of channel suck-back water opening valve 206 using its spray nozzle to vacuum return slurry channel 202 in injection water into
One step improves the upward mobility of mud, and after returning slurry channel 202 into vacuum, mud enters to be located at ground through 10 pump drainage of sludge pipe
Mud pit 8 on face, to carry out further mud conditioning.
In the process, the ground pressure of ground pressure 3 real-time monitoring drilling tool surrounding soil of test section, locality pressure test section 3 monitor
In ground when hypertonia, adjusts the suck-back water opening valve 206 returned in slurry section 2 and improves suck-back water pressure, increase the plasma discharge amount of mud,
Make pressure reduction in ground, and the injection pressure for controlling the cement slurry of whitewash section 1 and lower whitewashing section 4 increases, and improves mud dilution
Efficiency；Conversely, then adjusting the suck-back water opening valve 206 returned in slurry section 2 when local pressure test section 3 monitors hypotony in ground
Suck-back water pressure is reduced, the plasma discharge amount of mud is reduced, and controls the injection pressure of the cement slurry of whitewash section 1 and lower whitewashing section 4
Reduce, avoid cement slurry from wasting, thus effectively retentively in pressure balance；
At the same time, during drilling tool 9 above mentions, lower whitewashing section 4 while outward gunite 13 and compressed air 12,
Impingement mix is carried out to mud under the collective effect of cement slurry 13 and compressed air 12, to form mix cement slurry；While with
The cement slurry convergence of upper whitewashing section 1, in conjunction with the drilling tool 9 that above mentions of revolution, rotatably gunite 12 around drilling tool 9, herein
The formation whirl spraying cement object within the scope of design diameter is realized in the process；And so on, until mentioning ground in the revolution of drilling tool 9, most
It applies to form whirl spraying pile body 11 as Figure 8-9 eventually.
The present embodiment has the beneficial effect that：（1）Whitewashing section 1 and lower whitewashing section 4 on being arranged on drilling tool 9, by drilling tool 9
Cement slurry injection is carried out during proposing, and the cement slurry of injection can be made to carry out cutting dilution to mud, while forming matter around drilling tool
Reliable whirl spraying pile body 11 is measured, the stabilization of pressure in ground is effectively controlled, guarantees whitewashing quality and efficiency；（2）By utilizing drilling tool 9
On upper whitewashing section 1 can carry out cutting to the soil body and form mud, and using the slurry progress vacuum pump drainage mud of section 2 is returned, so that mud
Pollution is few, while the regulation of interior pressure over the ground, decreases the phenomenon that mud " altering " enters soil, water body or underground piping；（3）
The high pressure jet grouting work progress of influence in to(for) surrounding enviroment is smaller, and ultra-deep construction is guaranteed.
Claims (10)
1. a kind of multiple superhigh pressure jetting grouting construction method of super-large diameter, it is characterised in that the construction method includes following step
Suddenly：Pilot hole is being carried out using pilot hole drilling machine to slip casting point；After pore-forming, the drilling tool of whirl spraying machinery is transferred to bottom hole, the drilling tool
Lower end tool there are two section of whitewashing, respectively upper whitewashing section and lower whitewashing sections；It is mechanical to run the whirl spraying, mentions the brill upper
The upper whitewashing section and the lower whitewashing section thereon is set to distinguish outside gunite while tool, around the drilling tool
Form whirl spraying pile body.
2. the multiple superhigh pressure jetting grouting construction method of a kind of super-large diameter according to claim 1, it is characterised in that
During the pilot hole of the pilot hole drilling machine, steel pile casting is set at layer of sand, rubble stratum or the boulder bed encountered and carries out retaining wall.
3. the multiple superhigh pressure jetting grouting construction method of a kind of super-large diameter according to claim 1, it is characterised in that
After the pilot hole drilling machine completes pilot hole and the drilling rod of extraction thereon, thin-walled pilot hole pipe is set in the hole to projected depth, institute
Stating thin-walled pilot hole pipe can be crashed to pieces under the cement slurry jet-action of the two whitewashing sections.
4. the multiple superhigh pressure jetting grouting construction method of a kind of super-large diameter according to claim 1, it is characterised in that
During the drilling tool above mentions, the upper whitewashing section horizontally outward gunite with by the mud of the drilling tool periphery carry out
It diluting and mud is discharged, remaining mud is continued to be discharged the lower whitewashing section by postinjection cement slurry horizontally outward, so that
The cement slurry that whirl spraying goes out forms whirl spraying pile body around the drilling tool.
5. the multiple superhigh pressure jetting grouting construction method of a kind of super-large diameter according to claim 4, it is characterised in that
The drilling tool above mention and horizontally outward gunite while, using between the upper whitewashing section and the lower whitewashing section
Return slurry section carry out vacuum spoil disposal slurry.
6. the multiple superhigh pressure jetting grouting construction method of a kind of super-large diameter according to claim 5, it is characterised in that benefit
It is with the slurry section method that carries out vacuum spoil disposal slurry of returning：It is provided with a vacuum in the drilling tool and returns slurry channel, the vacuum
The pulp returning port opened up on slurry channel and the drilling tool outer wall is returned to be connected, the vacuum return starch channel by mud pass through described in return slurry
In mouth pump drainage to the mud conditioning pond resting on the ground.
7. the multiple superhigh pressure jetting grouting construction method of a kind of super-large diameter according to claim 6, it is characterised in that
The vacuum return slurry channel pump drainage mud during, be set to vacuum return slurry channel in a spray nozzle into it mud
Conveying direction is sprayed water, to improve the mobility of mud.
8. the multiple superhigh pressure jetting grouting construction method of a kind of super-large diameter according to claim 1, it is characterised in that institute
Whitewashing section and the lower whitewashing section are stated during horizontal-jet cement slurry, the upper whitewashing section and the lower whitewashing section are same
Step sprays pressure-air horizontally outward, to carry out cutting and crushing to the soil body around the drilling tool.
9. the multiple superhigh pressure jetting grouting construction method of a kind of super-large diameter according to claim 1, it is characterised in that
The drilling tool above mention and horizontally outward gunite while, to around the drilling tool the soil body carry out press test.
10. the multiple superhigh pressure jetting grouting construction method of a kind of super-large diameter according to claim 1, it is characterised in that institute
It states and is provided with horizontally nozzle A in whitewashing section, the nozzle B tilted upward is provided in the lower whitewashing section, according to required
The design diameter of the whirl spraying pile body applied adjusts the upward tilt angle of the nozzle B in advance；It is above mentioned in the drilling tool
In the process, the upper whitewashing section by the nozzle A horizontally outward gunite to cut the dilution soil body, the lower whitewashing section
Gunite is tilted upward by the nozzle B, two strands of cement slurries are intersected at design diameter position, in the brill
The whirl spraying pile body of design diameter is formed around tool.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111305196A (en) * | 2020-03-18 | 2020-06-19 | 河北建设勘察研究院有限公司 | Construction method of deep-hole high-pressure jet grouting pile in gravel soil layer |
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