CN108914939A - A kind of major diameter ultra-deep high pressure jet grouting construction method - Google Patents
A kind of major diameter ultra-deep high pressure jet grouting construction method Download PDFInfo
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- CN108914939A CN108914939A CN201810712144.8A CN201810712144A CN108914939A CN 108914939 A CN108914939 A CN 108914939A CN 201810712144 A CN201810712144 A CN 201810712144A CN 108914939 A CN108914939 A CN 108914939A
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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
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- 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
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- 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)
- Earth Drilling (AREA)
Abstract
The invention discloses a kind of major diameter ultra-deep high pressure jet grouting construction methods, it is characterised in that the construction method includes 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, the lower end of the drilling tool has a water cut section and whitewashing section, and the water cut section is located at the top of the whitewashing section；It is mechanical to run the whirl spraying, while revolution above mentions the drilling tool, the water cut section sprays high pressure water flow outward to carry out cutting into mud to the soil body around the drilling tool, and the outside gunite of the whitewashing section around the drilling tool to form whirl spraying pile body.It is an advantage of the invention that：Surrounding mud density can be diluted by setting water cut section, and the anti-slurry section of synchronous setting carries out concentration plasma discharge using special sludge pipe, and the pressure in ground can be effectively controlled while efficient spoil disposal, thus guarantee the quality of whitewashing pile, it is small to surrounding environment influence.
Description
Technical field
The invention belongs to foundation construction technical fields, and in particular to a kind of major diameter ultra-deep high pressure jet grouting construction party
Method.
Background technique
In the construction of conventional high-tension slip casting method, mud is naturally drained on the ground by the gap on drilling rod periphery.But depths
Spoil disposal it is highly difficult because pressure increases in drilling rod at ultra-deep and the ground of high pressure spray loophole surrounding, frequently can lead to spray
Efficiency decline, therefore, consolidation effect and reliability reduce.In addition, in the construction process, pressure increases in ground, surrounding will lead to
Surface uplift.
MJS engineering method (Metro Jet System) is also known as comprehensive high-pressure injection engineering method, and MJS engineering method is sprayed in conventional high-tension
On the basis of grouting process, device (habit is referred to as Monitor) is caused using unique antipriming pipe and front end, realizes hole
Pressure monitoring in interior pressure plasma discharge and ground, and by adjusting forcing plasma discharge amount to control pressure in ground, make in depths spoil disposal and ground
Pressure is rationally controlled, and is stablized pressure in ground, has also just been reduced and occurred a possibility that earth's surface deformation in construction, substantially
Degree reduces the influence to environment, and the reduction of pressure also further ensures expanded diameter in ground.It is compared with traditional whirl spraying technique,
MJS engineering method reduces the influence constructed to surrounding enviroment.
But it is found by the actual conditions of a large amount of site operation：Spoil disposal suction inlet is easy to be blocked by biggish soil block, sometimes
Also mud suction mouth is be easy to cause to block since mud density is larger, causes spoil disposal unsmooth, influence construction quality and construction speed.Therefore
It is badly in need of a kind of super-large diameter superhigh pressure jetting slip casting method of efficient spoil disposal, effectively controls the stabilization of pressure in ground, reach spoil disposal
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 major diameter ultra-deep high-pressure injections to infuse
Construction method is starched, which cut and be diluted mud to ambient earth by setting water cut section, and
The synchronous anti-slurry section of setting carries out concentration plasma discharge using special sludge pipe, and the pressure in ground can be effectively controlled while efficient spoil disposal
Power, to guarantee the quality of whitewashing pile.
The object of the invention realization is completed by following technical scheme：
A kind of major diameter ultra-deep high pressure jet grouting construction method, it is characterised in that the construction method includes the following steps：?
Pilot hole is 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 lower end of the drilling tool
Portion has a water cut section and whitewashing section, and the water cut section is located at the top of the whitewashing section；It is mechanical to run the whirl spraying,
While mentioning the drilling tool in revolution, the water cut section sprays high pressure water flow outward to carry out to the soil body around the drilling tool
Mud is cut into, the outside gunite of the whitewashing section around the drilling tool to form whirl spraying pile body.
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
Carry 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 high pressure water flow jet-action of the water cut section.
It is additionally provided between the water cut section and the whitewashing section and returns slurry section and ground pressure test section, returned in the drilling tool
Turn during above mentioning, presses the ground pressure value size around drilling tool described in test section real-time monitoring describedly, the slurry section of returning is to institute
It states water cut section and cuts the mud to be formed progress vacuum pump drainage；If test section is pressed to monitor the ground pressure around the drilling tool describedly
Value is greater than ground pressure equilibrium valve, then the mud pump drainage speed of slurry section is returned described in increasing；If test section is pressed to monitor the brill describedly
Ground pressure value around having is less than ground pressure equilibrium valve, then the mud pump drainage speed of slurry section is returned described in reduction.
It is using the method for returning slurry section progress vacuum pump drainage mud：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.
During the vacuum returns slurry channel pump drainage mud, it is set to the water spray that the vacuum is returned in slurry channel and sprays
Mouth conveying direction of mud into it is sprayed water, to improve the mobility of mud.
There is horizontally disposed cutting nozzle in the water cut section, there is horizontally disposed cement slurry in the whitewashing section
Nozzle, during drilling tool revolution above mentions, the cutting nozzle level sprays high pressure water flow, the cement slurry spray outward
Mouth gunite horizontally outward.
There is the cutting nozzle being arranged diagonally downward in the water cut section, have in the whitewashing section and tilt upward setting
Cement slurry nozzle, angle is obliquely installed by adjusting the cutting nozzle and the cement slurry nozzle respectively, to control
It states the cement slurry that cement slurry nozzle sprays outward and the high pressure water flow that the cutting nozzle sprays outward is intersected in design diameter position
Place is set, to form the whirl spraying pile body of design diameter around the drilling tool.
Also there is cutting nozzle of the row of horizontal to setting in the water cut section.
It is an advantage of the invention that：Surrounding mud density, and the anti-slurry Duan Li of synchronous setting can be diluted by the way that water cut section is arranged
Concentration plasma discharge is carried out with special sludge pipe, the pressure in ground can be effectively controlled while efficient spoil disposal, to guarantee to whitewash
The quality of pile is small to surrounding environment influence.
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 water cut segment structure schematic diagram in the present invention with horizontal cutting nozzle；
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 whitewashing segment structure schematic diagram in the present invention with horizontal cement slurry nozzle；
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 using two horizontal cement slurry nozzles in the present invention；
Fig. 8 whitewash using two horizontal cement slurry nozzles for drilling tool in the present invention applies the construction to form whirl spraying pile body signal
Figure；
Fig. 9 is the schematic diagram that whirl spraying pile body applies completion in the present invention；
Figure 10 is the whitewashing segment structure schematic diagram of the cement slurry nozzle in the present invention with inclination angle；
Figure 11 is the drilling tool structure schematic diagram of the cutting nozzle and cement slurry nozzle in the present invention with inclination angle；
Figure 12 is the cutting nozzle with the setting of horizontal and inclination angle in the present invention and the cement slurry nozzle with inclination angle
Drilling tool structure schematic diagram；
Figure 13 be the inclination angle that nozzle and cement slurry nozzle are cut in the present invention, between the two at a distance from and whirl spraying pile body diameter
Relation schematic diagram.
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. 1-13, label 1-18 is respectively in figure：Water cut section 1, water cut section ontology 101, air flue 102, segment of cutting water channel
103, annular groove 104, cutting nozzle 105, gas cap 106；Slurry section 2, pulp returning port 201, vacuum is returned to return slurry channel 202, return slurry section sheet
Body 203, day word baffle 204, high pressure aquaporin 205, suck-back water opening valve 206；Press test section 3 in ground；Whitewashing section 4, whitewashing section sheet
Body 401, whitewashing channel 402, cement slurry nozzle 403, air flue 404, gas cap 405；Drill bit 5；Pilot hole drilling machine 6, whirl spraying mechnisiam, mud
Starch case 8, drilling tool 9, thin-walled pilot hole pipe 10, sludge pipe 11, compressed air 12, cement slurry 13, cutting air 14, cutting water 15, rotation
Spray pile body 16, cutting mud 17, jet face 18.
Embodiment 1：As shown in figs 1-9, the present embodiment is specifically related to a kind of major diameter ultra-deep high pressure jet grouting construction party
Method, the construction method mainly pass through 1 pair of soil body of water cut section set by 9 lower end of drilling tool and carry out water cut and utilize to return slurry section
2 pairs of mud carry out vacuum pump drainage, while the periphery rotation using horizontally disposed cement slurry nozzle 403 in whitewashing section 4 to drilling tool 9
Gunite forms whirl spraying pile body 16, the pressure in ground can be effectively controlled while reaching efficient spoil disposal, to guarantee to whitewash
The quality of pile.
As shown in Figure 1, 2, water cut section 1 includes the water cut section ontology 101 in cylindrical shape, in water cut section ontology
Being horizontally disposed in 101 outside wall surface has at least one to cut nozzle 105, may also set up two, three or more cutting spray certainly
Mouth 105, above-mentioned cutting nozzle 105 is connected with the annular groove 104 in water cut section ontology 101, and annular groove 104 is then cut with water
It cuts section water channel 103 to be connected, in practical applications, high pressure water is squeezed into from A mouthfuls, and successively through water cut section water channel 103 and annular
Slot 104 finally carries out water cut to the soil body from cutting 105 mesohigh of nozzle is spouting.In addition, in water cut section ontology 101
Outside wall surface on correspond to cutting nozzle 105 position be provided with gas cap 106, gas cap 106 is connected with air flue 102, in reality
In, pressure-air is squeezed into from B mouthfuls, and after air flue 102 from 106 mesohigh of gas cap it is spouting with assisted machining water to soil
Body is cut, and to cutting water formed ring protection be enclosed in around water column, with reduce cutting water in course of injection by
Air drag, guarantee the cutting hardness of cutting water.
As described in Fig. 1,3, returning slurry section 2 includes returning slurry section ontology 203 in cylindrical shape, returns the outer wall of slurry section ontology 203
A pulp returning port 201 is offered on face, which returns slurry channel 202 with vacuum and be connected, in order to prevent the soil block of major diameter
Or stone is inhaled into vacuum and returns in slurry channel 202, a day word baffle 204 is additionally provided at pulp returning port 201, naturally it is also possible to be net
The structure of trellis or other limitation major diameter particles.
As shown in figure 4, returning slurry channel 202 to the transportation performance and efficiency of mud, in vacuum in order to further enhance vacuum
The top portion for returning slurry channel 202 is provided with a suck-back water opening valve 206, the spray nozzle face in the suck-back water opening valve 206
Vacuum returns slurry channel 202, and the same high pressure aquaporin 205 of suck-back water opening valve 206 is connected, and passes through suck-back water opening valve
206 can spray the high pressure water in high pressure aquaporin 205 along the conveying direction that vacuum returns mud in slurry channel 202, to improve
Mud returns the mobility in slurry channel 202 in vacuum and mud is discharged faster by high pressure water force.
As shown in Figure 1, ground pressure test section 3 is mainly used for testing the pressure of its surrounding soil, and the stratum that will be monitored
Pressure signal is transmitted to ground by signal transmssion line.
As shown in Figure 1,5, whitewashing section 4 includes the whitewashing section ontology 401 in cylindrical shape, the water on whitewashing section ontology 401
It is flat to be provided at least one cement slurry nozzle 403, it may also set up two, three or more cement slurry nozzle 403, cement slurry certainly
Nozzle 403 is connected with whitewashing channel 402 and by 402 conveying high-pressure cement slurry of channel of whitewashing；In addition, in cement slurry nozzle 403
Corresponding position is additionally provided with gas cap 405, and gas cap 405 is connected with air flue 404, and compressed air is transported to gas by air flue 404
It can be opened when at cap 405 and convey compressed air outward.
As shown in Figure 1, drill bit 5 is set to the front end of drilling tool 9, it is mainly used for during the decentralization of drilling tool 9 to pilot hole
Guiding or drilling.
As shown in figs 1-9, major diameter ultra-deep high pressure jet grouting construction method includes the 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 section of collapse hole, it is pulling out
Except thin-walled pilot hole pipe 10, e.g. Thin-Wall PVC pipe, above-mentioned thin-walled pilot hole pipe 10 is arranged in the drilling rod of pilot hole drilling machine 6 in hole later
It should can be crushed under the impact of high pressure cutting water, to not influence subsequent water cut and mud injection；
（2）As shown in Figure 7,8, after pilot hole to be done, whirl spraying mechnisiam is mobile in place, decentralization drilling tool 9 to bottom hole is then run
Whirl spraying mechnisiam and high speed rotation upper body drilling tool 9, during drilling tool 9 above mentions, positioned at the water of 9 multi-function head topmost of drilling tool
Segment of cutting 1 is cut the high-pressure injection cutting water 15 outside first of nozzle 105, and empty by the outside high-pressure injection of gas cap 106 cutting
Gas 14 carries out cutting early period by the peripheral soil body of the high pressure cutting water 15 to drilling tool 9, forms a biggish cylinder cutting region
Domain reduces the loss of the spray operation cutting soil body, and cutting water 15 cuts the soil mixed diluting to get off with it and forms cutting
Mud 17, certainly, the cutting diameter of cutting water 15 control within the scope of the design diameter of whirl spraying pile body 16；Wherein, high pressure
Cutting water 15 is squeezed by A mouthfuls and is successively ejected outward through segment of cutting water channel 103, annular groove 104 and cutting nozzle 105；
After soil cutting is diluted to mud by water cut section 1, slurry 2 pairs of mud of section are returned positioned at 1 lower section of water cut section
Carry out vacuum pump drainage, that is, under vacuum suction effect, mud returns slurry channel 202 into vacuum through pulp returning port 201, and vacuum returns slurry
The suck-back water opening valve 206 of 202 top portion of channel using its spray nozzle to vacuum return slurry channel 202 in injection water it is further
The upward mobility of mud is improved, after returning slurry channel 202 into vacuum, mud enters to rest on the ground through 11 pump drainage of sludge pipe
Mud pit 8, 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 stratum
When hypertonia, adjusts the suck-back water opening valve 206 returned in slurry section 2 and improve suck-back water pressure, increase the plasma discharge amount of mud, make ground
Stressor layer reduces；Conversely, then adjusting the suck-back water returned in slurry section 2 when local pressure test section 3 monitors that strata pressure is too low and opening
Valve 206 reduces suck-back water pressure, reduces the plasma discharge amount of mud, to effectively keep the pressure balance on stratum；
At the same time, during drilling tool 9 above mentions, whitewashing section 4 while outward gunite 13 and compressed air 12, in water
Impingement mix is carried out to the soil for being mixed with water quality under 12 collective effect of mud 13 and compressed air, to form blended cement
Slurry；And above mentioned since drilling tool 9 turns round, high-speed rotating drilling tool 9 can during outside gunite 13 shape
At whirl spraying pile body 16；And so on, it until mentioning ground in the revolution of drilling tool 9, finally applies to form whirl spraying pile body as shown in Figure 9
16。
The present embodiment has the beneficial effect that：（1）It can " comprehensive " progress high pressure jet grouting construction；（2）It is effectively ensured
Stake diameter is big, and pile quality is good；（3）Small on surrounding enviroment influence, ultra-deep construction is guaranteed；（4）There is special sludge pipe to be collected
Middle plasma discharge decreases mud " altering " and enters soil, water body or ground so that mud contamination is few, while the regulation to strata pressure
The phenomenon that lower pipeline.
Embodiment 2：As shown in Figure 10,11,13, the present embodiment is the difference from embodiment 1 is that cut spray in the present embodiment
Mouth 105 tilts down setting, and cement slurry nozzle 403 is then obliquely installed upwards, and the two is on same vertical line, and the two is sprayed
The cutting water 15 and cement slurry 13 shot out is intersected on jet face 18, is sprayed by adjusting cutting nozzle 105 and cement slurry respectively
Mouth 403 is obliquely installed angle, can control the position of the jet face 18 of intersection, that is, is intersected at setting diametrical position, from
And the whirl spraying pile body 16 of design diameter is formed around drilling tool 9.
In practical applications, it according to the design diameter of the required whirl spraying pile body 16 applied, adjusts and cuts nozzle on drilling tool 9
Spacing and respective tilt angle between 105 and cement slurry nozzle 403, to make the two in injection cutting water 15 and cement
The position that crosses when starching 13 is in the design radial position of whirl spraying pile body 16, and specific calculation formula is：；
Wherein, D is that 403 gunite 13 of cement slurry nozzle and cutting nozzle 105 spray cutting water 15 at the position that crosses
It is formed by the diameter of whirl spraying pile body 16；L is the spacing cut between nozzle 105 and cement slurry nozzle 403；α is cutting nozzle
Angle between 105 or cement slurry nozzle 403 and vertical direction, i.e. tilt angle.
The present embodiment has the beneficial effect that：（1）The diameter of whirl spraying pile body can be effectively controlled according to construction requirement；（2）It can be with
" comprehensive " progress high pressure jet grouting construction；（3）It is good that pile quality is effectively ensured；（4）Small on surrounding enviroment influence, ultra-deep is applied
Work is guaranteed；（5）There is special sludge pipe to carry out concentration plasma discharge, so that mud contamination is few, while the regulation of interior pressure over the ground,
Reduce the phenomenon that mud " altering " enters soil, water body or underground piping.
Embodiment 3, as shown in figure 12, the present embodiment is the difference from example 2 is that in the present embodiment in water cut section 1 also
Increase has horizontally disposed cutting nozzle 105, which can carry out more the soil body around drilling tool 9
It also can ensure that whirl spraying pile body 16 is straight while can effectively control whirl spraying pile body diameter according to construction requirement for strong cutting
Diameter is sufficiently large.
Claims (9)
1. a kind of major diameter ultra-deep high pressure jet grouting construction method, it is characterised in that the construction method includes 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, under the drilling tool
End has a water cut section and whitewashing section, and the water cut section is located at the top of the whitewashing section；It is mechanical to run the whirl spraying,
Revolution above mention the drilling tool while, the water cut section spray outward high pressure water flow with to the soil body around the drilling tool into
Row cuts into mud, and the outside gunite of the whitewashing section around the drilling tool to form whirl spraying pile body.
2. a kind of major diameter ultra-deep high pressure jet grouting construction method according to claim 1, it is characterised in that described
During the pilot hole of 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. a kind of major diameter ultra-deep high pressure jet grouting construction method according to claim 1, it is characterised in that described
After pilot hole drilling machine completes pilot hole and the drilling rod of extraction thereon, setting thin-walled pilot hole pipe is described thin to projected depth in the hole
Wall pilot hole pipe can be crashed to pieces under the high pressure water flow jet-action of the water cut section.
4. a kind of major diameter ultra-deep high pressure jet grouting construction method according to claim 1, it is characterised in that described
It is additionally provided between water cut section and the whitewashing section and returns slurry section and ground pressure test section, the process above proposed is turned round in the drilling tool
In, the ground pressure value size around drilling tool described in test section real-time monitoring is pressed describedly, and the slurry section of returning cuts the water cut section
It cuts the mud to be formed and carries out vacuum pump drainage；If test section is pressed to monitor that the ground pressure value around the drilling tool flattens with being greater than describedly
Weighing apparatus value then returns the mud pump drainage speed of slurry section described in increasing；If test section is pressed to monitor the ground pressure around the drilling tool describedly
Value is less than ground pressure equilibrium valve, then the mud pump drainage speed of slurry section is returned described in reduction.
5. a kind of major diameter ultra-deep high pressure jet grouting construction method according to claim 4, it is characterised in that utilize institute
Stating the method for returning slurry section progress vacuum pump drainage mud is：It is provided with a vacuum in the drilling tool and returns slurry channel, the vacuum is returned
The pulp returning port opened up on slurry channel and the drilling tool outer wall is connected, and the vacuum returns slurry channel for mud through the pulp returning port
In pump drainage to the mud conditioning pond resting on the ground.
6. a kind of major diameter ultra-deep high pressure jet grouting construction method according to claim 5, it is characterised in that described
Vacuum return slurry channel pump drainage mud during, be set to the vacuum return slurry channel in a spray nozzle into it mud
Conveying direction is sprayed water, to improve the mobility of mud.
7. a kind of major diameter ultra-deep high pressure jet grouting construction method according to claim 1, it is characterised in that the water
There is horizontally disposed cutting nozzle on segment of cutting, there is horizontally disposed cement slurry nozzle in the whitewashing section, in the brill
During tool revolution above mentions, the cutting nozzle level sprays high pressure water flow outward, and the cement slurry nozzle level sprays outward
Jetting mud.
8. a kind of major diameter ultra-deep high pressure jet grouting construction method according to claim 1, it is characterised in that the water
There is the cutting nozzle being arranged diagonally downward on segment of cutting, there is the cement slurry nozzle for tilting upward setting in the whitewashing section,
Be obliquely installed angle by adjusting the cutting nozzle and the cement slurry nozzle respectively, with control the cement slurry nozzle to
The high pressure water flow that the cement slurry of outer injection and the cutting nozzle spray outward is intersected at design diameter position, in the brill
The whirl spraying pile body of design diameter is formed around tool.
9. a kind of major diameter ultra-deep high pressure jet grouting construction method according to claim 8, it is characterised in that the water
Also there is cutting nozzle of the row of horizontal to setting on segment of cutting.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110409434A (en) * | 2019-06-25 | 2019-11-05 | 浙江省建工集团有限责任公司 | A kind of the high-pressure rotary jet grouting pile technique and its drill bit of combination pvc pipe |
| CN113186930A (en) * | 2021-04-28 | 2021-07-30 | 建基建设集团有限公司 | Improved MJS construction machine and construction method |
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Application publication date: 20181130 |