CN108301839B - Pumping decompression directional grouting equipment and method - Google Patents
Pumping decompression directional grouting equipment and method Download PDFInfo
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- CN108301839B CN108301839B CN201810071199.5A CN201810071199A CN108301839B CN 108301839 B CN108301839 B CN 108301839B CN 201810071199 A CN201810071199 A CN 201810071199A CN 108301839 B CN108301839 B CN 108301839B
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000005086 pumping Methods 0.000 title claims abstract description 12
- 230000006837 decompression Effects 0.000 title abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 119
- 238000002347 injection Methods 0.000 claims abstract description 38
- 239000007924 injection Substances 0.000 claims abstract description 38
- 239000000243 solution Substances 0.000 claims abstract description 13
- 238000012546 transfer Methods 0.000 claims abstract description 9
- 239000004568 cement Substances 0.000 claims description 75
- 238000001802 infusion Methods 0.000 claims description 32
- 239000002002 slurry Substances 0.000 claims description 26
- 230000000903 blocking effect Effects 0.000 claims description 24
- 238000011144 upstream manufacturing Methods 0.000 claims description 17
- 230000000694 effects Effects 0.000 claims description 9
- 230000009467 reduction Effects 0.000 claims description 9
- 238000005553 drilling Methods 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 238000013461 design Methods 0.000 claims description 3
- 238000011835 investigation Methods 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 230000000994 depressogenic effect Effects 0.000 claims 4
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 239000007788 liquid Substances 0.000 abstract description 16
- 238000007569 slipcasting Methods 0.000 abstract description 6
- 230000008569 process Effects 0.000 abstract description 4
- 239000011440 grout Substances 0.000 description 5
- 230000008859 change Effects 0.000 description 3
- 238000004090 dissolution Methods 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 238000003776 cleavage reaction Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000007017 scission Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000007614 solvation Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/001—Improving soil or rock, e.g. by freezing; Injections
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Soil Sciences (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a pumping decompression directional grouting device and method, and relates to the technical field of grouting processes. This directional grouting equipment of pump suction decompression, including the rich water stratum, the inside in rich water stratum is provided with the molten cavity pipeline, the well upper reaches end intercommunication of molten cavity pipeline has first transfer line, the one end intercommunication that the molten cavity pipeline was kept away from to first transfer line has first decompression pump, the upper reaches end intercommunication of molten cavity pipeline has the second transfer line, the one end that the molten cavity pipeline was kept away from to the second transfer line is connected with second decompression pump, the well lower extreme intercommunication of molten cavity pipeline has the injection pipeline. This pump suction decompression directional grouting equipment through setting up first decompression water pump and second decompression water pump, changes the interior local pressure gradient of solution cavity pipeline, and the guide slip casting liquid flows to solution cavity pipeline upper reaches to in having solved water-rich area solution cavity pipeline gushing water control, to the problem of the directional slip casting of solution cavity upper reaches direction.
Description
Technical Field
The invention relates to the technical field of grouting processes, in particular to a pumping decompression directional grouting device and method.
Background
Grouting is an engineering operation activity which utilizes a hydraulic or electrochemical principle to inject certain slurry capable of being solidified into cracks or pores of a stratum so as to improve the physical and mechanical properties of the stratum and achieve the purposes of reinforcement, water stopping and the like. Grouting construction is a common construction method in foundation treatment and reinforcement and building foundation pit curtain leakage stoppage. In the process of building a tunnel in a water-rich area, water inrush and water gushing occur, and the water inrush and water gushing are important causes of disasters in the process of building the tunnel. Grouting is one of the common methods for treating water inrush and gushing. Because the water flow channel of the water-rich stratum is complex, after the conventional grouting is implemented, grouting liquid generally flows to the downstream of the water flow channel under the action of the underground water flow field, when the grouting plugging direction is opposite to the underground water flow field direction, the grouting plugging effect is poor, and most of the grouting liquid can be flushed to the downstream by the underground water;
the existing grouting device is mainly a vacuum directional grouting device, and the prior patent discloses that the application number is: CN201521078447.7 is a vacuum directional grouting device, comprising: the grouting pipes are arranged around the vacuum pipe at intervals; the vacuum pipe and the grouting pipe are both provided with an opening at one end and a closed end, and the pipe wall of the vacuum pipe is provided with a first opening; the grouting pipe comprises an outer pipe and an inner pipe, the inner pipe is sleeved in the outer pipe, and the inner pipe can move up and down in the outer pipe; the outer sides of two ends of the inner tube are both connected with plugging air bags, and the plugging air bags can be tightly attached to the outer tube after being inflated; and the pipe wall of the outer pipe is provided with a second opening, and the pipe wall of the inner pipe is provided with a third opening. By adopting the grouting device, directional and fixed-point grouting is realized, and the problems that in the prior art, due to overlarge grouting pressure, a soil body generates a cleavage crack, and grout is lost along the cleavage crack, so that the grouting device cannot play a role in effective reinforcement or blocking are solved;
and the vacuum directional device for soil layer reinforcing grouting can not be used in the water-rich area tunnel engineering. Reason 1: the soil layer grouting does not need to resist high external water pressure, the plugging air bag can realize inflation and sealing, but the grouting pressure of tunnel engineering in a water-rich area is generally more than 3MPa and can reach more than 10MPa at most, and the plugging air bag cannot realize sealing of a grouting pipe. Reason 2: the water burst of underground engineering is high in general underground water pressure and large in flow, rapid-setting cement grout is used for grouting and plugging, after rapid-setting cement is used, the viscosity of the cement grout in a pipeline is rapidly increased, the resistance caused by the rapid-setting cement grout is also multiplied, and the inner pipe and the outer pipe of a grouting pipe in the scheme are difficult to move up and down.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a pumping decompression directional grouting device, which solves the problem of directional grouting towards the upstream direction of a dissolution cavity in water inrush treatment of a dissolution cavity pipeline in a water-rich area.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: a pumping pressure reduction directional grouting device comprises a water-rich stratum, wherein a dissolved cavity pipeline is arranged inside the water-rich stratum, a middle upstream end of the dissolved cavity pipeline is communicated with a first infusion pipe, one end, away from the dissolved cavity pipeline, of the first infusion pipe is communicated with a first pressure reduction water pump, an upstream end of the dissolved cavity pipeline is communicated with a second infusion pipe, one end, away from the dissolved cavity pipeline, of the second infusion pipe is connected with a second pressure reduction water pump, a middle lower end of the dissolved cavity pipeline is communicated with an injection pipeline, one end, away from the dissolved cavity pipeline, of the injection pipeline is communicated with a first branch pipe and a second branch pipe, one end, away from the injection pipeline, of the first branch pipe is communicated with a first cement grouting pump, one end, away from the injection pipeline, of the second branch pipe is communicated with an accelerator pump, a pressure sensor is arranged on the surface of the first branch pipe, and a flow sensor is arranged on, flow sensor's output end fixedly connected with control terminal computer, be provided with low reaches passageway blocking device in the low reaches pipeline of solution cavity pipeline, the surface of low reaches passageway blocking device is connected with the third transfer line, the one end fixedly connected with second cement grouting pump of low reaches passageway blocking device is kept away from to the third transfer line, control terminal computer respectively with pressure sensor, flow sensor, first cement grouting pump and accelerator pump electric connection.
Preferably, the surfaces of the first infusion tube, the second infusion tube, the first branch tube and the second branch tube are all provided with an electric control valve.
A method of pumping depressurized directional grouting, comprising the steps of:
s1: performing on-site investigation, measuring the water pressure and flow of the water inrush holes and the size range of the pipeline of the dissolution cavity;
s2: inputting parameters of water pressure, injection flow, designed injection distance and size range of a cavity pipeline in a control terminal computer to obtain the relation between the injection amount of the accelerator and the injection amount of the cement and the control range of the grouting pressure;
s3: connecting an injection pipeline with a first cement grouting pump and an accelerator pump, and arranging a flow sensor, a pressure sensor and an electric control valve on the pipeline;
s4: drilling holes at the upstream position of a cavity pipeline, placing a first pressure reducing water pump and a second pressure reducing water pump, and increasing or decreasing the pressure reducing water pumps according to the length of a grouting design distance;
s5: drilling a hole at the downstream position of the cavity pipeline, placing a downstream channel blocking device, opening all pressure reducing water pumps, passing through a second cement grouting pump, injecting cement slurry into the blocking device, filtering water by the device to form a cement plug, blocking a downstream direction flow channel, and then closing the second cement grouting pump;
s6: closing the second pressure reducing water pump, starting the first pressure reducing water pump, then opening the first cement grouting pump, grouting into the cavity pipeline, starting the accelerator pump when the first pressure reducing water pump discharges cement paste, and at the moment, automatically controlling the cement flow and the accelerator flow by the control terminal computer according to a set value so as to form quick setting cement paste;
s7: opening a second pressure reducing water pump, gradually closing the first pressure reducing water pump, keeping the injection flow of the quick-setting cement slurry, closing the second pressure reducing water pump when the second pressure reducing water pump discharges more viscous cement slurry or even paste, then grouting to reduce the injection flow, and keeping for a period of time to ensure that the quick-setting cement slurry is completely solidified;
s8: and removing the pressure reduction water pump, and checking the plugging effect.
Preferably, a through groove for placing the first infusion tube, the second infusion tube, the injection pipeline and the third infusion tube is formed in the water-rich stratum.
Preferably, the surface of the downstream channel obstruction means is of a water filtration material.
Preferably, the first pressure-reducing water pump and the second pressure-reducing water pump are the same pressure-reducing water pump.
(III) advantageous effects
The traditional grouting method is difficult to realize the upstream directional grouting in the cavity dissolving pipeline. The invention provides a pumping decompression directional grouting device. The method has the following beneficial effects:
(1) this pump suction step-down directional grouting equipment, through setting up first relief water pump and second relief water pump, change local pressure gradient in the solution cavity pipeline, the guide slip casting liquid flows to solution cavity pipeline upper reaches to in having solved water-rich area solution cavity pipeline and gushing water treatment suddenly, to the problem of the directional slip casting of solution cavity upper reaches direction, through setting up low reaches passageway choke device, second cement slip casting pump and third transfer line, can block low reaches passageway, thereby avoid the thick liquid to flow to low reaches.
(2) This pump suction step-down directional grouting equipment through setting up the rapid hardening cement thick liquid, makes the rapid hardening cement thick liquid of solvation chamber pipeline can solidify rapidly to avoided the thick liquid to be eroded by groundwater, through adopting control terminal computer to adjust accelerator and cement ratio, realized the quantitative control of rapid hardening cement thick liquid setting time, the concentration that makes the rapid hardening cement thick liquid reaches more accurate control, thereby makes the effect of the directional slip casting of solvation chamber upper reaches better.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
In the figure: 1 water-rich stratum, 2 solution cavity pipelines, 3 first liquid conveying pipes, 4 first pressure reducing water pumps, 5 second liquid conveying pipes, 6 second pressure reducing water pumps, 7 injection pipelines, 8 first branch pipes, 9 second branch pipes, 10 first cement grouting pumps, 11 accelerator pumps, 12 pressure sensors, 13 flow sensors, 14 control terminal computers, 15 downstream channel blocking devices, 16 third liquid conveying pipes, 17 second cement grouting pumps and 18 electric control valves.
Detailed Description
The materials, methods and apparatus used in the following examples, which are not specifically illustrated, are conventional in the art and are commercially available to those of ordinary skill in the art.
In the following description of the present invention, it is to be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and "upright", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
In the following description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; the connection may be direct or indirect via an intermediate medium, and the connection may be internal to the two components. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, in the following description of the present invention, the meaning of "plurality", and "plural" is two or more unless otherwise specified.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention provides a technical solution: a pumping decompression directional grouting device comprises a water-rich stratum 1, a cavity pipeline 2 is arranged inside the water-rich stratum 1, a first infusion tube 3 is communicated with the middle upstream end of the cavity pipeline 2, a first pressure reducing water pump 4 is communicated with one end, far away from the cavity pipeline 2, of the first infusion tube 3, a second infusion tube 5 is communicated with the upstream end of the cavity pipeline 2, a second pressure reducing water pump 6 is connected with one end, far away from the cavity pipeline 2, of the second infusion tube 5, the first pressure reducing water pump 4 and the second pressure reducing water pump 6 are the same pressure reducing water pump, the first pressure reducing water pump 4 and the second pressure reducing water pump 6 are arranged to change the local pressure gradient in the cavity pipeline 2 and guide grouting liquid to flow to the upstream of the cavity pipeline 2, so that the problem of directional grouting to the upstream direction of the cavity in the water inrush treatment of the cavity pipeline in a water-rich area is solved, wherein the pressure reducing water pump is not arranged, but a grouting pump with very high pressure is required to, the operation is difficult, the energy consumption is large, and high-voltage equipment is easy to have potential safety hazards; the middle lower end of the cavity pipeline 2 is communicated with an injection pipeline 7, one end of the injection pipeline 7, which is far away from the cavity pipeline 2, is communicated with a first branch pipe 8 and a second branch pipe 9, the first infusion pipe 3, the second infusion pipe 5, the surfaces of the first branch pipe 8 and the second branch pipe 9 are all provided with an electric control valve 18, one end of the first branch pipe 8, which is far away from the injection pipeline 7, is communicated with a first cement grouting pump 10, one end of the second branch pipe 9, which is far away from the injection pipeline 7, is communicated with an accelerator pump 11, the surface of the first branch pipe 8 is provided with a pressure sensor 12, the surface of the second branch pipe 9 is provided with a flow sensor 13, the output end of the flow sensor 13 is fixedly connected with a control terminal computer 14, the quantitative control of the setting time of the accelerator cement grout is realized by adopting the control terminal computer 14, the pressure sensor 12, the flow sensor 13, the first cement grouting, the concentration of the quick-setting cement slurry is controlled more accurately, so that the directional grouting effect in the upstream direction of the cavity is better, a downstream channel blocking device 15 is arranged in a downstream pipeline of a cavity pipeline 2, the surface of the downstream channel blocking device 15 is made of water filtering materials, a third infusion tube 16 is connected to the surface of the downstream channel blocking device 15, a second cement grouting pump 17 is fixedly connected to one end, far away from the downstream channel blocking device 15, of the third infusion tube 16, the downstream channel can be blocked by arranging the downstream channel blocking device 15, the second cement grouting pump 17 and the third infusion tube 16, so that the slurry is prevented from flowing downstream, a control terminal computer 14 is respectively and electrically connected with a pressure sensor 12, a flow sensor 13, a first cement grouting pump 10 and an accelerator pump 11, a first infusion tube 3, a second infusion tube 5 and a third infusion tube 5 are arranged in the water-rich stratum 1, The filling pipe 7 and the third infusion tube 16.
A method of pumping depressurized directional grouting, comprising the steps of:
s1: performing on-site investigation, measuring the water pressure and flow of the water inrush holes, and measuring the size range of the cavity pipeline 2;
s2: inputting parameters of water pressure, injection flow, designed injection distance and size range of the cavity pipeline 2 into a control terminal computer 14 to obtain the relation between the injection amount of the accelerator and the injection amount of the cement and the control range of the grouting pressure;
s3: connecting the injection pipeline 7 with a first cement grouting pump 10 and an accelerator pump 11, and arranging a flow sensor 13, a pressure sensor 12 and an electric control valve 18 on the pipeline;
s4: drilling holes at the upstream position of the cavity pipeline 2, placing a first pressure reducing water pump 4 and a second pressure reducing water pump 6, and increasing or decreasing the pressure reducing water pumps according to the length of the grouting design distance;
s5: drilling a hole at the downstream position of the cavity dissolving pipeline 2, placing a downstream channel blocking device 15, opening all pressure reducing water pumps, passing through a second cement grouting pump 17 and injecting cement slurry into the blocking device, forming a cement plug after water filtration of the device, blocking a downstream direction flow channel, and then closing the second cement grouting pump 17;
s6: closing the second pressure reducing water pump 6, starting the first pressure reducing water pump 4, then opening the first cement grouting pump 10, grouting into the cavity pipeline 2, starting the accelerator pump 11 when the first pressure reducing water pump 4 discharges cement slurry, and at the moment, automatically controlling the cement flow and the accelerator flow by the control terminal computer 14 according to a set value so as to form quick-setting cement slurry, and enabling the quick-setting cement slurry in the cavity pipeline 2 to be quickly solidified by setting the quick-setting cement slurry so as to avoid the slurry from being eroded by underground water;
s7: opening a second pressure reducing water pump 6, gradually closing the first pressure reducing water pump 4, keeping the injection flow of the quick-setting cement slurry, closing the second pressure reducing water pump 6 when the second pressure reducing water pump 6 discharges more viscous cement slurry or even paste, then reducing the injection flow of the grouting, and keeping for a period of time to ensure that the quick-setting cement slurry is completely solidified;
s8: and removing the pressure reduction water pump, and checking the plugging effect.
In summary, according to the pumping pressure reduction directional grouting equipment, the first pressure reduction water pump 4 and the second pressure reduction water pump 6 are arranged to change the local pressure gradient in the cavity pipeline 2 and guide grouting liquid to flow to the upstream of the cavity pipeline 2, so that the problem of directional grouting to the upstream direction of the cavity in water inrush treatment of the cavity pipeline in a water-rich area is solved, and the downstream channel can be blocked by arranging the downstream channel blocking device 15, the second cement grouting pump 17 and the third infusion tube 16, so that the grouting liquid is prevented from flowing downstream.
Meanwhile, the quick-setting cement slurry in the cavity pipeline 2 can be quickly set by arranging the quick-setting cement slurry, so that the slurry is prevented from being eroded by underground water, the setting time of the quick-setting cement slurry is quantitatively controlled by adjusting the ratio of the quick-setting agent to cement by adopting the control terminal computer 14, the concentration of the quick-setting cement slurry is controlled more accurately, and the directional grouting effect in the upstream direction of the cavity is better.
The electrical components presented in the document are all electrically connected with an external master controller and 220V mains, and the master controller can be a conventional known device controlled by a computer or the like.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A pumping depressurization directional grouting device comprising a water-rich formation (1), characterized in that: the water-rich stratum (1) is internally provided with a dissolved cavity pipeline (2), the middle upstream end of the dissolved cavity pipeline (2) is communicated with a first infusion tube (3), one end of the first infusion tube (3) far away from the dissolved cavity pipeline (2) is communicated with a first pressure reducing pump (4), the upstream end of the dissolved cavity pipeline (2) is communicated with a second infusion tube (5), one end of the second infusion tube (5) far away from the dissolved cavity pipeline (2) is connected with a second pressure reducing pump (6), the middle lower end of the dissolved cavity pipeline (2) is communicated with an injection pipeline (7), one end of the injection pipeline (7) far away from the dissolved cavity pipeline (2) is communicated with a first branch tube (8) and a second branch tube (9), one end of the first branch tube (8) far away from the injection pipeline (7) is communicated with a first cement slurry injection pump (10), one end of the second branch tube (9) far away from the injection pipeline (7) is communicated with a quick-setting agent pump (11), the surface of first branch pipe (8) is provided with pressure sensor (12), the surface of second branch pipe (9) is provided with flow sensor (13), output fixedly connected with control terminal computer (14) of flow sensor (13), be provided with low reaches passageway blocking device (15) in the low reaches pipeline of solution cavity pipeline (2), the surface of low reaches passageway blocking device (15) is connected with third transfer line (16), one end fixedly connected with second cement grouting pump (17) of low reaches passageway blocking device (15) are kept away from in third transfer line (16), control terminal computer (14) respectively with pressure sensor (12), flow sensor (13), first cement grouting pump (10) and accelerator pump (11) electric connection.
2. A pumped depressed directional grouting apparatus as claimed in claim 1, characterised in that: the surfaces of the first infusion tube (3), the second infusion tube (5), the first branch tube (8) and the second branch tube (9) are all provided with electric control valves (18).
3. A method of pump-pumped, reduced-pressure, directional grouting, comprising the steps of:
s1: performing on-site investigation, measuring the water pressure and flow of the water gushing hole, and measuring the size range of the cavity pipeline (2);
s2: inputting parameters of water pressure, injection flow, designed injection distance and size range of the cavity pipeline (2) in a control terminal computer (14) to obtain the relation between the injection amount of the accelerator and the injection amount of the cement and the control range of the grouting pressure;
s3: connecting an injection pipeline (7) with a first cement grouting pump (10) and an accelerator pump (11), and arranging a flow sensor (13), a pressure sensor (12) and an electric control valve (18) on the pipeline;
s4: drilling holes at the upstream position of the cavity dissolving pipeline (2), placing a first pressure reducing water pump (4) and a second pressure reducing water pump (6), and increasing or decreasing the pressure reducing water pumps according to the length of a grouting design distance;
s5: drilling a hole at the downstream position of the cavity dissolving pipeline (2), placing a downstream channel blocking device (15), opening all pressure reducing water pumps, injecting cement slurry into the blocking device through a second cement grouting pump (17), forming a cement plug after the device filters water, blocking a downstream flow channel, and then closing the second cement grouting pump (17);
s6: closing the second pressure reducing water pump (6), starting the first pressure reducing water pump (4), then opening the first cement grouting pump (10), grouting into the cavity pipeline (2), starting the accelerator pump (11) when the first pressure reducing water pump (4) discharges cement paste, and at the moment, automatically controlling the cement flow and the accelerator flow by the control terminal computer (14) according to a set value, so as to form quick-setting cement paste, and when the first pressure reducing water pump (4) discharges viscous cement paste, indicating that the cavity pipeline (2) between the first cement grouting pump (10) and the first pressure reducing water pump (4) is filled with the quick-setting cement paste;
s7: opening a second pressure reducing water pump (6), gradually closing a first pressure reducing water pump (4), keeping the injection flow of the quick-setting cement slurry, closing the second pressure reducing water pump (6) when the second pressure reducing water pump (6) discharges more viscous cement slurry or even paste, then reducing the injection flow by grouting, and keeping for a period of time to ensure that the quick-setting cement slurry is completely solidified;
s8: and removing the pressure reduction water pump, and checking the plugging effect.
4. A pumped depressed directional grouting apparatus as claimed in claim 1, characterised in that: a through groove for placing a first infusion tube (3), a second infusion tube (5), an injection pipeline (7) and a third infusion tube (16) is formed in the water-rich stratum (1).
5. A pumped depressed directional grouting apparatus as claimed in claim 1, characterised in that: the surface of the downstream channel blocking device (15) is made of water filtering material.
6. A pumped depressed directional grouting apparatus as claimed in claim 1, characterised in that: the first pressure reducing water pump (4) and the second pressure reducing water pump (6) are the same pressure reducing water pump.
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| CN201810071199.5A CN108301839B (en) | 2018-01-25 | 2018-01-25 | Pumping decompression directional grouting equipment and method |
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| CN201810071199.5A CN108301839B (en) | 2018-01-25 | 2018-01-25 | Pumping decompression directional grouting equipment and method |
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| US7097386B2 (en) * | 2003-11-13 | 2006-08-29 | Freeport-Mcmoran Energy Llc | Simultaneous development of underground caverns and deposition of materials |
| KR100707492B1 (en) * | 2005-05-09 | 2007-04-13 | 김진춘 | A grout carrying out mehtod for Paste Backfill Grouting at the Cave |
| CN105201448B (en) * | 2015-09-24 | 2017-09-05 | 山东大学 | Block water slip casting method for blocking in a kind of high-pressure high-flow water gushing channelway |
| CN105298518B (en) * | 2015-10-14 | 2018-06-22 | 山东大学 | A kind of profound cavern bridging of hidden-type blocks the administering method of water burst |
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