CN108775011A - A kind of controlled diameter high pressure jet grouting device and its grouting process - Google Patents
A kind of controlled diameter high pressure jet grouting device and its grouting process Download PDFInfo
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- CN108775011A CN108775011A CN201810711082.9A CN201810711082A CN108775011A CN 108775011 A CN108775011 A CN 108775011A CN 201810711082 A CN201810711082 A CN 201810711082A CN 108775011 A CN108775011 A CN 108775011A
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- 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
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
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- General Engineering & Computer Science (AREA)
- Soil Sciences (AREA)
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- Agronomy & Crop Science (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
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Abstract
The invention discloses a kind of controlled diameter high pressure jet grouting device and its grouting process, which includes a slip casting component for being fixed on drilling tool bottom end, and slip casting component is followed successively by from top to bottom：Water cut section, return slurry section, press test section, whitewashing section and drill bit；It is provided at least one set of nozzle sets in whitewashing section, nozzle sets include positioned at upper end and the nozzle that tilts down and being located at lower end and acclivitous nozzle, and the two is located in same vertical lines；It is upper carry drilling tool while, each nozzle in drilling tool whitewashing section is set to be obliquely installed direction with the outside gunite of the flow of the pressure of 35-45MPa, 85-100L/min along it respectively and be intersected at design radial, to form the churning pile body of controlled diameter around drilling tool.It is an advantage of the invention that：The churning pile body that cement mortar injection can get controlled diameter is carried out by the nozzle sets being obliquely installed, and reservoir pressure coefficient can keep stable in the construction process, the influence for surrounding enviroment is smaller.
Description
Technical field
The invention belongs to foundation construction technical fields, and in particular to a kind of controlled diameter high pressure jet grouting device and its note
Sizing process.
Background technology
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 drilling rod at ultra-deep increases with pressure in the ground of high pressure spray loophole surrounding, frequently can lead to spray
Efficiency declines, and therefore, consolidation effect and reliability reduce.In addition, in the construction process, pressure increases in ground, surrounding can be caused
Surface uplift.
MJS engineering methods (Metro Jet System) are also known as comprehensive high-pressure injection engineering method, and MJS engineering methods are sprayed in conventional high-tension
On the basis of grouting process, uses unique antipriming pipe and device (custom is referred to as Monitor) is caused in front end, realize 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 pressure stability in ground is made, and has also just reduced the possibility for occurring 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 churning technique,
MJS engineering methods reduce influence of the construction 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 larger soil block, sometimes
It also be easy to cause mud suction mouth blocking since mud density is larger, causes spoil disposal unsmooth, influences construction quality and construction speed.Thus
It needs to provide a kind of super-large diameter superhigh pressure jetting grouting construction method of efficient spoil disposal, effectively controls the stabilization of pressure in ground,
Spoil disposal is set to reach optimum efficiency.
Invention content
According to the deficiencies of the prior art described above, It is an object of the present invention to provide a kind of controlled diameter high pressure jet groutings
Device and its grouting process, the grouting device by during drilling tool above carries using the nozzle sets that are obliquely installed of at least one set to
Outer gunite realizes applying for the churning pile body of controlled diameter to realize that cement mortar is intersected in design radial position.
The object of the invention realization is completed by following technical scheme：
A kind of controlled diameter high pressure jet grouting device, it is characterised in that the grouting device includes a slip casting component, the note
Slurry component is fixedly installed on the bottom end of a drilling tool, and the slip casting component is followed successively by from top to bottom：Water cut section, return slurry section, press
Test section, whitewashing section and drill bit；Be provided at least one set of nozzle sets in the whitewashing section, the nozzle sets include positioned at upper end and
The nozzle that tilts down and it is located at lower end and acclivitous nozzle, the two is located in same vertical lines.
Cutting nozzle and gas cap are provided on the lateral wall of the water cut section, the cutting nozzle is the same as in the segment of cutting
The annular groove and segment of cutting water channel in portion are sequentially connected, and the gas cap is connected with the air flue inside the segment of cutting.
It is described return slurry section in be provided with a vacuum return slurry channel, it is described return slurry section lateral wall on be provided with a pulp returning port,
A netted baffle plate is provided on the pulp returning port, the pulp returning port returns slurry channel with the vacuum and is connected to；It is logical that the vacuum returns slurry
Road connects a mud transmission pipeline, and the mud transmission pipeline is also connected with a mud conditioning pond.
Be provided in the whitewashing section whitewashing channel, it is described whitewashing channel one end be connected with the nozzle, the other end
It is connected with cement mortar high-pressure delivery pipeline；Correspond to the installation position of each nozzle on the whitewashing section side wall, respectively
It is provided with gas cap, the gas cap is connected with the air flue being set in the whitewashing section.
A kind of grouting process being related to any controlled diameter high pressure jet grouting device, is related to a diameter of 2000mm-
The churning pile body of 2600mm applies, it is characterised in that the grouting process includes the following steps：It will be under the drilling tool of churning machinery
It puts to a bottom hole, runs the churning machinery, while revolution above carries the drilling tool, make in the drilling tool bottom end whitewashing section
Each nozzle be obliquely installed direction along it with the outside gunite of the flow of the pressure of 35-45MPa, 85-100L/min respectively
And be intersected at design radial, to form the churning pile body of controlled diameter around the drilling tool.
In the whitewashing section, the outer edge of each nozzle is provided with the gas cap of connection air flue, outside in the nozzle
While gunite, each gas cap is outward with the pressure of 0.7-1.2MPa and 1.0~2.0m3The flow of/min is outside
High-pressure injection air.
While revolution above carries the drilling tool, make the cutting nozzle in the drilling tool bottom end water cut section with 5-
The pressure of 30MPa sprays high pressure water flow to carry out cutting to the soil body around the drilling tool and dilution forms mud outward, and makes
Gas cap in the water cut section sprays pressure-air with to the soil body around the drilling tool outward with the pressure of 0.7-1.2MPa
It is cut.
While revolution above carries the drilling tool, the slurry section of returning of the drilling tool bottom end is made to carry out vacuum suck-back mud, suck-back
Mud pressure is 0~20MPa, and suck-back mudflow amount is 0~60L/min.
During revolution above carries the drilling tool, make the ground of the drilling tool bottom end that test section be pressed to monitor the brill in real time
Reservoir pressure coefficient around having, if reservoir pressure coefficient between 1.3-1.6, returns the suck-back mud pressure of slurry section described in holding
Power and suck-back mudflow amount parameter constant；If reservoir pressure coefficient is more than 1.6, the slurry section of returning improves suck-back mud pressure and suck-back
Mudflow amount is to improve the pump drainage rate of mud；If reservoir pressure coefficient is less than 1.3, it is described return slurry section reduce suck-back mud pressure and
Suck-back mudflow amount is to reduce the pump drainage rate of mud.
By the inclination for controlling spacing and the nozzle in the nozzle sets in the whitewashing section between two nozzles
To control the position that crosses when cement mortar injection, calculation formula is angle：；Wherein, D sprays for the nozzle sets
Jetting mud is formed by the diameter of the churning pile body at the position that crosses；L is between two nozzles in the nozzle sets
Spacing；Angles of the α between the nozzle and vertical direction.
It is an advantage of the invention that：（1）Whitewashing section on drilling tool is provided at least one set of nozzle with angle of inclination, passes through
Cement mortar injection is carried out during drilling tool above proposes, and cement mortar can be made to be intersected at design radial, it is ensured that the diameter of churning pile body
Controllably, ensure whitewashing quality and efficiency while the stabilization of pressure in effectively control ground, obtain the churning pile body of reliable in quality；
（2）Cutting can be carried out to the soil body by using the water cut section on drilling tool and forms mud, and carries out vacuum pump drainage using slurry section is returned
Mud so that mud contamination is few, while the regulation and control of interior pressure over the ground, decreases mud " altering " and enters soil, water body or underground
The phenomenon that pipeline；（3）The high pressure jet grouting work progress of influence in to(for) surrounding enviroment is smaller, and ultra-deep construction is guaranteed.
Description of the drawings
Fig. 1 is the structure composition schematic diagram of each functional section in drilling tool lower end in the present invention；
Fig. 2 is water cut segment structure schematic diagram 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 for being provided with single group nozzle sets in the present invention in whitewashing section；
Fig. 6 is the structural schematic diagram for being provided with double group nozzle sets in the present invention in whitewashing section；
Fig. 7 is the construction procedure schematic diagram for carrying out pilot hole in the present invention using pilot hole drilling machine；
Fig. 8 is the status diagram that drilling tool carries out initial gunite work using single group nozzle sets in the present invention；
Fig. 9 is the status diagram that drilling tool carries out initial gunite work using double group nozzle sets in the present invention；
Figure 10 using single group nozzle sets whitewash for drilling tool in the present invention applies the construction schematic diagram to form churning pile body；
Figure 11 using double group nozzle sets whitewash for drilling tool in the present invention applies the construction schematic diagram to form churning pile body；
Figure 12 is the schematic diagram that churning pile body applies completion in the present invention.
Specific implementation mode
The feature of the present 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. 1-12, respectively label 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, nozzle sets 403, nozzle 403a, nozzle 403b, air flue 404, gas cap 405；Drill bit 5；Pilot hole drilling machine
6, churning mechnisiam, mud pit 8, drilling tool 9, thin-walled pilot hole pipe 10, sludge pipe 11, compressed air 12, cement mortar 13, cutting air
14, cutting water 15, churning pile body 16.
Embodiment：As shown in figs. 1-12, the present embodiment more particularly to a kind of controlled diameter high pressure jet grouting device and its
Grouting process, the grouting device are a slip casting component for being fixed on 9 bottom end of drilling tool, include successively from top to bottom water cut section 1,
Return slurry section 2, press test section 3, whitewashing section 4 and drill bit 5；The grouting process mainly carries out water by 1 pair of soil body of water cut section
It cuts and carries out vacuum pump drainages using 2 pairs of mud of slurry section are returned, while using the nozzle sets 403 being obliquely installed in whitewashing section 4 to brill
The peripheral gunite of tool simultaneously makes it be intersected in formation churning pile body at design radial position, to reach control churning pile body diameter
Purpose.
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
Be provided at least two cutting nozzles 105 in 101 outside wall surface, above-mentioned each cutting nozzle 105 in water cut section ontology 101
Annular groove 104 is connected, and annular groove 104 is then connected with water cut section water channel 103, and in practical applications, high pressure water is from A mouthfuls
Squeeze into, and successively through water cut section water channel 103 and annular groove 104, finally from cutting 105 mesohigh of nozzle eject to the soil body into
Row water cut.In addition, the position for corresponding to cutting nozzle 105 in the outside wall surface of water cut section ontology 101 is provided with gas cap
106, gas cap 106 is connected with air flue 102, and in practical applications, pressure-air is squeezed into after air flue 102 from B mouthfuls from gas cap 106
In it is spouting cutting is constituted to the soil body with assisted machining water, and ring protection is formed to cutting water and is enclosed in around water column.
As shown in Figure 1,3, it includes returning slurry section ontology 203 in cylindrical shape to return slurry section 2, returns the outer wall of slurry section ontology 203
On offer a pulp returning port 201, the pulp returning port 201 and vacuum return slurry channel 202 and are connected, in order to prevent the soil block of major diameter or
Stone is inhaled into vacuum and returns within 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, in order into one promoted vacuum return slurry channel 202 in for
The transportation performance of mud, the top portion that slurry channel 202 is returned in vacuum are provided with a suck-back water opening valve 206, which opens
Spray nozzle face vacuum in valve 206 returns slurry channel 202, and the 206 same high pressure aquaporin 205 of suck-back water opening valve is connected
Logical, the conveying direction that suck-back water opening valve 206 can be by the high pressure water in high pressure aquaporin 205 along mud sprays, to improve mud
It starches and returns the mobility in slurry channel 202 in vacuum.
As shown in Figure 1, ground pressure test section 3 is mainly used for testing the pressure of its surrounding soil and thus calculating obtaining accordingly
Reservoir pressure coefficient returns slurry section 2 and adjusts it in real time and return slurry rate according to the size of reservoir pressure coefficient.
As shown in Fig. 1,5,6, whitewashing section 4 includes the whitewashing section ontology 401 in cylindrical shape, on whitewashing section ontology 401
One group or two groups of nozzle sets 403 are set, and nozzle sets 403 include being set to the nozzle 403a on 401 top of whitewashing section ontology and setting
It is placed in the nozzle 403b of 401 lower part of whitewashing section, wherein nozzle 403a tilts down setting, and nozzle 403b is obliquely installed upwards, and
Nozzle 403a and nozzle 403b in same group should be located in same vertical lines, and nozzle 403a and nozzle 403b is logical with whitewashing
Road 402 is connected and by 402 conveying high-pressure cement mortar of channel of whitewashing；In addition, the corresponding position of nozzle 403a or 403b also
It is provided with gas cap 405, gas cap 405 is connected with air flue 404, can be open-top simultaneously by gas cap 405 when air flue 404 exports compressed air
Conveying 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 drilling tool 9 is transferred to pilot hole
It is oriented to or creeps into.
As shown in figs. 1-12, in the present embodiment the grouting process of controlled diameter high pressure jet grouting device specifically include it is following
Step：
（1）As shown in fig. 7, determining the center of slip casting point, pilot hole is carried out using pilot hole drilling machine 6, pilot hole diameter is in 200-
Between 300mm, the drilling rod of pilot hole drilling machine 6 is pulled out after pilot hole to projected depth；
During pilot hole, premium mud retaining wall, mud viscosity >=20s, proportion 1.20-1.25 should be used；
During pilot hole, collapse hole may occur when if encountering layer of sand, rubble stratum or boulder bed, therefore to these stratum
It carries out that cylinder-wall protecting rather than mud off above-mentioned need to be arranged when pilot hole；And these may be caused with the hole of collapse hole, it is pulling out
Thin-walled pilot hole pipe 10 is set after the drilling rod of pilot hole drilling machine 6 in hole, and e.g. Thin-Wall PVC pipe, above-mentioned thin-walled pilot hole pipe 10 is answered
It can be crushed under the impact of high pressure cutting water, to not influence subsequent water cut and cement mortar injection；
（2）As shown in Figure 8,9, after pilot hole to be done, churning mechnisiam is moved in place, according to the required churning pile body 16 applied
Design diameter（The design diameter of churning pile body 16 is chosen to be 2200mm in the present embodiment）, adjust each nozzle sets 403 on drilling tool 9
Spacing between middle nozzle 403a and nozzle 403b and respective angle of inclination, both to enable in gunite 13
The radial location of design is enough met at, specific calculation formula is：；
Wherein, D is the diameter that 403 gunite 13 of nozzle sets is formed by churning pile body 16 at the position that crosses；L is nozzle
Spacing in group 403 between nozzle 403a and nozzle 403b；Angles of the α between nozzle 403a or 403b and vertical direction, i.e.,
Angle of inclination；
After complete each nozzle sets 403 to be regulated, by the decentralization of drilling tool 9 of churning mechnisiam to bottom hole；
（3）As shown in Fig. 1-6,8-12, runs churning mechnisiam and drilling tool 9 is above carried with the rotation of the rotating speed of 3-4rpm, on drilling tool 9
During carrying, the water cut section 1 for being located at 9 slip casting component topmost of drilling tool is high outward first through cutting nozzle 105 and gas cap 106
Pressure injection cutting water 15 and cutting air 14, wherein the injection pressure of cutting water 15 is 5-30MPa, cuts the spray of air 14
Injection pressure is 0.7-1.2MPa, is cut in advance to the soil body of 9 periphery of drilling tool by high pressure cutting water 15, formation one is larger
Cylinder cut range, reduce the loss of the spray operation cutting soil body, and the soil body can be diluted to mud by cutting water 15, when
So, the cutting diameter of cutting water 15 controls within the scope of the design diameter of churning pile body 16；Air 14 is cut to assist cutting
It cuts water 15 and cutting is constituted to the soil body, and ring protection is formed to cutting water 15 and is enclosed in around flow；Wherein, the cutting water of high pressure
15 are squeezed by A mouthfuls and are ejected outward through segment of cutting water channel 103, annular groove 104 and cutting nozzle 105 successively；High pressure is cut
Air 14 is cut to be squeezed by B mouthfuls and spouting from gas cap 106 through air flue 102；
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
Vacuum pump drainage is carried out, suck-back mud pressure is 0~20MPa, and suck-back mudflow amount is 0~60L/min；That is, under vacuum suction effect,
Mud returns slurry channel 202 through pulp returning port 201 into vacuum, and the suck-back water opening valve 206 that vacuum returns slurry 202 top portion of channel utilizes
Its spray nozzle returns injection water in slurry channel 202 to vacuum and further increases the upward mobility of mud, is returned into vacuum
After starching channel 202, mud enters the mud pit 8 resting on the ground through 11 pump drainage of sludge pipe, to carry out further mud conditioning；
In the process, pressure test section 3 in ground monitors the ground pressure of 9 surrounding soil of drilling tool and is thus scaled strata pressure system in real time
Number；（a）When reservoir pressure coefficient around drilling tool 9 is between 1.3-1.6, show that the soil body around drilling tool 9 is in one
Equilibrium state keeps returning suck-back mud pressure and suck-back mudflow amount parameter constant in slurry section 2；（b）Ground lamination around drilling tool 9
When force coefficient is less than 1.3, show that the pressure of 9 surrounding soil of drilling tool is too small, reduces the suck-back mud pressure and suck-back mud returned in slurry section 2
Flow parameter makes reservoir pressure coefficient gradually go up between 1.3-1.6 to reduce mud pump drainage rate；（c）When drilling tool 9 weeks
When the reservoir pressure coefficient enclosed is more than 1.6, show that the pressure of 9 surrounding soil of drilling tool is excessive, improves the suck-back mud pressure returned in slurry section 2
Power and suck-back mud flow parameter make reservoir pressure coefficient be gradually decrease between 1.3-1.6 to improve mud pump drainage rate；
At the same time, during drilling tool 9 above carries, whitewashing section 4 is simultaneously outward with the pressure of 35-45MPa, 85-100L/min
Flow gunite 13, and with the pressure and 1.0~2.0m of 0.7-1.2MPa3The flow of/min sprays compressed air
12, impingement mix is carried out to the soil for being mixed with water quality under 12 collective effect of cement mortar 13 and compressed air, it is mixed to be formed
Heshui mud；The cement mortar 13 that nozzle 403a and nozzle 403b in nozzle sets 403 are inclined outwardly injection is intersected in design radial
Position（As illustrated in figs. 8-11）, and two strands of cement mortars 13 dissipate no longer in the rear impact to cross generation of cancelling out each other to extending out
It dissipates, therefore the cement mortar 13 that nozzle sets 403 are sprayed outward can be effectively controlled at design radial position, and since drilling tool 9 is
It is carried in revolution, therefore high-speed rotating drilling tool 9 can form churning pile body 16 during outside gunite 13；So
Back and forth, it until mentioning ground in the revolution of drilling tool 9, finally applies to form churning pile body 16 as shown in figure 12.
In order to verify the reasonability of the used operations parameter in mortar depositing construction in the present embodiment, carry out below
Effect compares：
（A）The design diameter of churning pile body 16 is 2200mm in the present embodiment, under different operation parameter, reservoir pressure coefficient
It is as follows：
It can be seen that when the injection pressure by the injection pressure control of cutting water in 5-30MPa, cutting air is controlled in 0.7-
Between 1.2MPa, suck-back mud pressure is controlled in 0-20MPa, suck-back mud flow control between 0-60L/min, cement mortar is sprayed
Between 85-100L/min, the injection pressure control of compressed air is existed in 35-45MPa, injection flow control for injection pressure control
0.7-1.2MPa, injection flow control are in 1.0~2.0m3When between/min, reservoir pressure coefficient can be controlled in 1.3-1.6
Normal value between, avoid the soil body around drilling tool 9 from occurring unbalance；
And best grouting operation technological parameter is：The injection pressure of cutting water is 20MPa, and the injection pressure for cutting air is
1.0MPa, suck-back mud pressure is 15MPa, suck-back mudflow amount is 28L/min, and well sprays pressure 40MPa, injection flow are
90L/min, the injection pressure of compressed air is 1.0MPa, injection flow 2.0m3/min。
（B）The design diameter of churning pile body 16 is that 2200mm applies acquisition under different operation parameter in the present embodiment
Churning pile body actual diameter it is as follows：
It can be seen that when the injection pressure by the injection pressure control of cutting water in 5-30MPa, cutting air is controlled in 0.7-
Between 1.2MPa, suck-back mud pressure is controlled in 0-20MPa, suck-back mud flow control between 0-60L/min, cement mortar is sprayed
Between 85-100L/min, the injection pressure control of compressed air is existed in 35-45MPa, injection flow control for injection pressure control
0.7-1.2MPa, injection flow control are in 1.0~2.0m3When between/min, it can obtain churning pile body diameter by practical and set
It counts diameter deviation and is no more than 20mm；
And best grouting operation technological parameter is：The injection pressure of cutting water is 20MPa, and the injection pressure for cutting air is
1.0MPa, suck-back mud pressure is 15MPa, suck-back mudflow amount is 28L/min, and well sprays pressure 40MPa, injection flow are
90L/min, the injection pressure of compressed air is 1.0MPa, injection flow 2.0m3/min。
（C）The design diameter of churning pile body 16 is 2200mm in the present embodiment, under different operation parameter, surrounding formation
It is as follows by shock wave：
It can be seen that when the injection pressure by the injection pressure control of cutting water in 5-30MPa, cutting air is controlled in 0.7-
Between 1.2MPa, suck-back mud pressure is controlled in 0-20MPa, suck-back mud flow control between 0-60L/min, cement mortar is sprayed
Between 85-100L/min, the injection pressure control of compressed air is existed in 35-45MPa, injection flow control for injection pressure control
0.7-1.2MPa, injection flow control are in 1.0~2.0m3It, can will be for surrounding formations during slip casting when between/min
Disturbing influence be applied to minimum level；
And best grouting operation technological parameter is：The injection pressure of cutting water is 20MPa, and the injection pressure for cutting air is
1.0MPa, suck-back mud pressure is 15MPa, suck-back mudflow amount is 28L/min, and well sprays pressure 40MPa, injection flow are
90L/min, the injection pressure of compressed air is 1.0MPa, injection flow 2.0m3/min。
The present embodiment has the beneficial effect that：（1）Two nozzles for having angle of inclination are set in whitewashing section, can effectively ensure to spray
Radius is starched, ensures whitewashing quality and efficiency while the stabilization of pressure in effectively control ground；（2）It can " comprehensive " progress height
Press jet groutinl construction；（3）It is big that a diameter is effectively ensured, pile quality is good；（4）Small on surrounding enviroment influence, ultra-deep construction has guarantor
Card；（5）There is special sludge pipe to carry out concentration plasma discharge so that mud contamination is few, while the regulation and control of interior pressure over the ground, decreases
The phenomenon that mud " altering " enters soil, water body or underground piping.
Claims (10)
1. a kind of controlled diameter high pressure jet grouting device, it is characterised in that the grouting device includes a slip casting component, described
Slip casting component is fixedly installed on the bottom end of a drilling tool, and the slip casting component is followed successively by from top to bottom：Water cut section, return slurry section,
Press test section, whitewashing section and drill bit；At least one set of nozzle sets are provided in the whitewashing section, the nozzle sets include being located at upper end
And the nozzle that tilts down and it is located at lower end and acclivitous nozzle, the two is located in same vertical lines.
2. a kind of controlled diameter high pressure jet grouting device according to claim 1, it is characterised in that the water cut section
Lateral wall on be provided with cutting nozzle and gas cap, the cutting nozzle is the same as the annular groove and segment of cutting water inside the segment of cutting
Road is sequentially connected, and the gas cap is connected with the air flue inside the segment of cutting.
3. a kind of controlled diameter high pressure jet grouting device according to claim 1, it is characterised in that described to return in slurry section
It is provided with a vacuum and returns slurry channel, be provided with a pulp returning port on the lateral wall for returning slurry section, one is provided on the pulp returning port
Netted baffle plate, the pulp returning port return slurry channel with the vacuum and are connected to；The vacuum returns slurry channel and connects a mud transmission pipeline,
The mud transmission pipeline is also connected with a mud conditioning pond.
4. a kind of controlled diameter high pressure jet grouting device according to claim 1, it is characterised in that in the whitewashing section
It is provided with whitewashing channel, the one end in the whitewashing channel is connected with the nozzle, the other end and cement mortar high-pressure delivery pipeline
It is connected；The installation position for corresponding to each nozzle on the whitewashing section side wall, is respectively arranged with gas cap, the gas cap with
The air flue being set in the whitewashing section is connected.
5. a kind of grouting process being related to any controlled diameter high pressure jet grouting device in claim 1-4 is related to straight
Diameter is applying for the churning pile body of 2000mm-2600mm, it is characterised in that the grouting process includes the following steps：By rotary jetting apparatus
The drilling tool of tool is transferred to a bottom hole, and run the churning machinery makes the drilling tool bottom end while revolution above carries the drilling tool
It is outside with the flow of the pressure of 35-45MPa, 85-100L/min that each nozzle in portion's whitewashing section is obliquely installed direction along it respectively
Gunite is simultaneously intersected at design radial, to form the churning pile body of controlled diameter around the drilling tool.
6. a kind of grouting process of controlled diameter high pressure jet grouting device according to claim 5, it is characterised in that
In the whitewashing section, the outer edge of each nozzle is provided with the gas cap of connection air flue, in the outside gunite of the nozzle
While, each gas cap is outward with the pressure of 0.7-1.2MPa and 1.0~2.0m3The outside high-pressure injection of flow of/min is empty
Gas.
7. a kind of grouting process of controlled diameter high pressure jet grouting device according to claim 5, it is characterised in that
While carrying the drilling tool in revolution, make the cutting nozzle in the drilling tool bottom end water cut section with the pressure of 5-30MPa to
Outer injection high pressure water flow and is made in the water cut section with carrying out cutting to the soil body around the drilling tool and dilution forms mud
Gas cap pressure-air is sprayed to cut the soil body around the drilling tool with the pressure of 0.7-1.2MPa outward.
8. a kind of grouting process of controlled diameter high pressure jet grouting device according to claim 5, it is characterised in that
While carrying the drilling tool in revolution, make the drilling tool bottom end return slurry section carry out vacuum suck-back mud, suck-back mud pressure be 0~
20MPa, suck-back mudflow amount are 0~60L/min.
9. a kind of grouting process of controlled diameter high pressure jet grouting device according to claim 8, it is characterised in that
During carrying the drilling tool in revolution, make the ground of the drilling tool bottom end that test section be pressed to monitor the ground around the drilling tool in real time
It is laminated force coefficient, if reservoir pressure coefficient between 1.3-1.6, returns the suck-back mud pressure and suck-back mud of slurry section described in holding
Flow parameter is constant；If reservoir pressure coefficient is more than 1.6, the slurry section of returning improves suck-back mud pressure and suck-back mudflow amount to carry
The pump drainage rate of high mud；If reservoir pressure coefficient is less than 1.3, the slurry section of returning reduces suck-back mud pressure and suck-back mudflow amount
To reduce the pump drainage rate of mud.
10. a kind of grouting process of controlled diameter high pressure jet grouting device according to claim 5, it is characterised in that logical
The angle of inclination for controlling spacing and the nozzle in the nozzle sets in the whitewashing section between two nozzles is crossed to control
The position that crosses when cement mortar sprays, calculation formula are：；Wherein, D is that the nozzle sets gunite exists
It crosses and is formed by the diameter of the churning pile body at position；L is the spacing between two nozzles in the nozzle sets；α is
Angle between the nozzle and vertical direction.
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| CN201810711082.9A CN108775011A (en) | 2018-07-03 | 2018-07-03 | A kind of controlled diameter high pressure jet grouting device and its grouting process |
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| CN201810711082.9A CN108775011A (en) | 2018-07-03 | 2018-07-03 | A kind of controlled diameter high pressure jet grouting device and its grouting process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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