CN112647893A - Construction method for drilling and pouring by adopting double-slurry mixer - Google Patents
Construction method for drilling and pouring by adopting double-slurry mixer Download PDFInfo
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- CN112647893A CN112647893A CN202011444145.2A CN202011444145A CN112647893A CN 112647893 A CN112647893 A CN 112647893A CN 202011444145 A CN202011444145 A CN 202011444145A CN 112647893 A CN112647893 A CN 112647893A
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- 235000019353 potassium silicate Nutrition 0.000 claims abstract description 64
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- 238000000034 method Methods 0.000 claims abstract description 21
- 238000007789 sealing Methods 0.000 claims abstract description 16
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Classifications
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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
- E21B33/138—Plastering the borehole wall; Injecting into the formation
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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
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
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- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The application discloses a construction method for drilling and pouring by adopting a double-slurry mixer, which comprises the following steps: step ST100 tool in place; ST200 geological survey is carried out to determine the mixing ratio of the double pulps; step ST300, system docking; respectively communicating the double-liquid-slurry mixer with a drill rod, a water glass slurry pipe and a water pressure plug pipe, and discharging the double-liquid-slurry mixer to a depth of 1-2 meters above the firstly found water inrush or leakage; step ST400 hole sealing; step ST500 double slurry injection; step ST600 closes the system and takes out the tool. The double-slurry pouring construction method provided by the invention can be suitable for effectively blocking water gushing or leakage phenomena in the depth of each stratum in the drilling process of various geology. When a hole with larger preset depth is constructed, the invention can block water gushing layers or leakage layers at different depths without being influenced by depth limitation and water gushing degree.
Description
Technical Field
The invention relates to the technical field of geological grouting, in particular to the technical field of water burst and leaking hole wall plugging grouting in a grouting and drilling process, and particularly relates to a construction method for performing drilling and grouting by adopting a double-liquid-slurry mixer.
Background
The double-slurry pouring plugging is mainly applied to a mode of plugging the leakage or water inrush at a specific depth section under the condition of large leakage or large water inrush. The double-slurry pouring construction is not equal to geological grouting, drilling is needed before geological grouting construction is carried out on a target area, and a channel for slurry to enter is used for subsequent grouting operation. In the drilling process, because the geological environment of difference probably runs into and gushes water, hole collapse phenomenons such as, especially gushes water appears in the drilling process, then very big be unfavorable for going on of driller's construction, then can carry out the hole wall shutoff through two thick liquids and solve the problem of gushing water or leaking out this moment for drilling work can continue to go on. The water gushing problem is not effectively controlled and solved, and the preset drilling depth can not be achieved, and even underground hole collapse can be caused. In order to avoid the problem that the drilling cannot be continued due to water burst in the drilling process, in the prior art, slurry is mostly adopted and added to be matched with the drilling construction, so that the underground pressure is balanced, meanwhile, the slurry can form wall protection in the drilling process, and the problems of water burst and hole collapse are avoided. However, when severe gushing conditions are encountered, then conventional muds have been unable to read the gushing water to effect plugging, requiring the cooperation of water glass grout and cement slurry for downhole plugging gushing water to avoid hole collapse and enable continued drilling to the specified depth.
However, in order to realize plugging under the condition of large water burst, the water glass slurry and the cement slurry are required to be sent to a specified depth according to a specified proportion, so that effective plugging on water burst can be realized, and a specific construction process or method is required to realize the effective plugging. In the prior art, various construction grouting methods adopting double-grouting plugging are not known, such as: the invention patent application with the publication number of CN106639973A discloses a grouting structure for surface ultra-deep hole double-liquid grouting and a grouting method thereof, and provides a double-liquid grouting structure. The basic principle of the method is that cement paste and water glass slurry are independently delivered into a hole with a specified depth, a stopper is used for taking a limited section of hole space as a mixing cavity, and the independent cement paste and the independent water glass slurry are delivered into the mixing cavity to realize mixing. Although the above prior art can reach a hole with a larger depth, the drawbacks are also very obvious and mainly appear as follows: first, the water glass slurry and the cement slurry, which are manually fed, cannot be mixed in a predetermined ratio due to various slurry impurities in the pores, which are mixed in the pores. Secondly, the natural mixing of the inner space of the hole is adopted, and no control mechanism for ensuring the uniformity of the double-slurry mixing is provided, so that the uneven mixing is easily caused, and the advantage of double-slurry filling is lost.
Disclosure of Invention
In order to solve the defects of the existing double-slurry pouring technology, the application provides a construction method for pouring by adopting a double-liquid slurry mixer, which aims to overcome the defects of the existing double-slurry pouring, achieve accurate slurry control and accurate slurry delivery, implement pertinence and accurate quick plugging on gushing water or a leakage layer, and solve the problems of discrete leakage and/or gushing water in the drilling of particularly difficult and complicated stratum.
In order to achieve the purpose, the technical scheme adopted by the application is as follows:
a construction method for drilling and pouring by adopting a double-slurry mixer comprises the following steps:
step ST100 tool in place; assembling a double-slurry mixer comprising a mixer body and a hydraulic plug for later use;
ST200 geological survey is carried out to determine the mixing ratio of the double pulps; carrying out hole sweeping, crack flushing and water pressing tests on the target hole, and determining the mixing ratio of cement paste and water glass according to the conditions of the water pressing tests;
step ST300, system docking; respectively communicating the double-liquid-slurry mixer with a drill rod, a water glass slurry pipe and a water pressure plug pipe, and discharging the double-liquid-slurry mixer to a depth of 1-2 meters above the firstly found water inrush or leakage;
step ST400 hole sealing; injecting water into the water pressure plug pipe and pressurizing to enable the water pressure plug to expand until a stable clamping structure is formed between the water pressure plug and the hole wall, wherein the whole space in the hole is divided into an upper open cavity and a lower closed cavity;
step ST500 double slurry injection; simultaneously injecting cement slurry with preset concentration into the drill rod and injecting water glass slurry into the water glass slurry pipe, wherein the injection amount and the grouting pressure are executed according to a preset scheme until grouting is finished;
step ST600, closing the system and taking out the tool; closing the cement slurry pipeline, the water glass slurry pipeline and the water pressure plug pipeline in sequence, taking out and cleaning the double-liquid-slurry mixer, and completing the current drilling and filling; and (6) continuing hole sweeping and drilling after the hole wall is blocked by leakage gushing water, and repeating the step ST100 to the step ST600 when secondary gushing water or leakage points are found.
In order to ensure that the construction method provided by the application can directly obtain the expected technical effect, the application also carries out a series of optimized settings on the double-slurry mixer playing a key role in the whole construction method, and specifically adopts the following various optimized structural design schemes: the double-liquid-slurry mixer is composed of a mixer body for mixing cement slurry and water glass and a water pressure plug for fixing the mixer body in the hole at a specified depth and detachably connecting the mixer body below the mixer body.
Preferably, the mixer body comprises an outer shell, and a reverse valve fixedly arranged in the outer shell and used for dividing an inner cavity of the outer shell into a first channel and a second channel which are independent and closed, wherein the reverse valve is provided with a valve core which conducts the first channel in a one-way manner, the tail ends of the first channel and the second channel are communicated through a mixing cavity arranged at the tail part of the outer shell, the mixing cavity is provided with an expansion structure, and the axial section of the mixing cavity gradually converges along the flowing direction of the fluid; the inlet end of the first channel is connected with a cement slurry inlet pipe, and the outlet end of the first channel is close to the mixing cavity and is arranged in a converging manner along the axial section of the fluid flowing direction; the inlet end of the second channel is connected with a water glass slurry inlet pipe, the outlet end of the second channel is provided with a wire drawing nozzle, and the mixing cavity is connected with a mixed slurry outlet pipe. As for the principle of cement slurry conveying in the first channel, cement slurry is pressurized by the slurry conveying pump and then sequentially reaches the valve core position from the cement slurry inlet pipe and the reverse valve, and the valve core has the function of blocking the cement slurry from entering, when the pressure of the cement slurry conveyed by the slurry conveying pump is greater than the pressure of the valve core, the cement slurry overcomes the resistance of the valve core and enters the valve core and then enters the mixing cavity. Meanwhile, the water glass is pressurized and conveyed into the water glass slurry inlet pipe through the slurry conveying pump so as to enter the second channel, and finally the water glass is conveyed into the mixing cavity through the wire drawing nozzle according to a preset form and mixed with the cement slurry in the first channel. The wire drawing nozzle has the function of preventing backflow, and the problem that the water glass pipeline is blocked due to the fact that cement slurry flows back into the wire drawing nozzle after pressurization of the water glass pipeline is stopped is avoided. Because the hybrid chamber has the structure of expanding, can reduce the velocity of flow after grout gets into the structure of expanding and fully mix with the sodium silicate thick liquid after the wire drawing, moreover, the hybrid chamber is the convergence structure setting along fluid circulation direction, further forms the extrusion to the thick liquid after the mixture, changes the misce bene state of mixed thick liquid, further promotes thick liquid misce bene degree. The double-slurry is fully mixed in the mixing cavity and then enters the preset depth section in the hole through the slurry mixing outlet pipe to be used for plugging the hole wall of the water burst hole section.
It is worth noting that the proportion of the double-slurry mixing is irrelevant to the mixer provided by the present application, and the preset proportion is determined by the delivery flow rates of the delivery pumps respectively providing the cement slurry and the water glass slurry. Regarding the depth of delivery, the grout pipe is advanced with the drilling rod defeated thick liquid pipeline intercommunication to the grout of the blender that this application provided, can be according to actual construction demand down to the mixed double thick liquid of appointed degree of depth, is not restricted to shallow surface layer and mixes thick liquid and send thick liquid. In order to improve the stability, the mixer can be fixed by matching with the existing water pressure plug pipe, so that the effect of accurate plugging can be better exerted.
Still further preferably, the first channel is composed of a cement slurry inlet pipe, a valve core and a slurry shooting pipe communicated with the mixing cavity, which are sequentially connected, the valve core comprises a high-pressure spring and a steel ball which is in abutting contact with the high-pressure spring and used for preventing cement slurry from flowing back, the inner part of the slurry shooting pipe gradually converges along the flowing direction of the cement slurry, and the critical surface intersected with the mixing cavity is the minimum cross section; and the side wall of the grout injection pipe is provided with a plurality of through holes for absorbing water glass grout. The spherical steel ball is adopted as the valve element member, so that the effects of reliable sealing and backflow prevention can be provided in cement slurry containing granular impurities, the steel ball is sealed by a line, particles in the cement slurry can be naturally avoided, and the valve element has better practicability and environmental adaptability compared with a one-way valve with a sealed surface. The inner channel is arranged to form the convergent grout injection pipe, so that the grout can be accelerated when flowing in the grout injection pipe, the cross section of the grout leaving the grout injection pipe and passing through the grout injection pipe at the moment is the smallest, the flow rate of the grout is the fastest at the moment, when the grout enters the mixing cavity at the maximum speed, local negative pressure can be formed, the grout is sucked into the side of the grout injection pipe at the moment to form local rotational flow, the internal rotational flow is similar to the Venturi effect, and the grout injection pipe can play a positive promoting role in fully mixing the grout and the cement grout. After the rotational flow, the mixing cavity is expanded compared with the slurry injection pipe and can be rapidly decelerated, a limited turbulence effect is formed in the mixing cavity, and the slurry is further uniformly mixed by matching with the mixing cavity with the convergent tail section. The side wall of the shooting pipe is communicated with the second channel through the plurality of through holes, and the effect of the communication between the cement paste and the water glass paste is realized for the first time. Because the grout spraying pipe is the convergence setting, the whole flow that grout flows in the grout spraying pipe is equal, because the cross-sectional area constantly reduces, then the velocity of flow of grout just constantly increases, then based on the venturi principle, the water glass that is located the second passageway can be adsorbed and get into in the grout spraying pipe under the negative pressure that the grout that flows at a high speed formed, realizes that the two thick liquid of small part mix. Because the uniform degree of the double-slurry mixing directly influences the plugging effect, the setting time and the stability of the hole wall leakage layer and the water inrush layer, the more uniform the slurry is, the closer the plugging and setting time is, the curing stability is to an expected theoretical value, and the technical effect of improving the double-slurry mixing uniformity as much as possible is pursued by any mixer, which is not exceptional in the application.
In conclusion, the two-stage mixing can be realized by adopting the structure, namely the primary mixing of water glass sucked through the through hole arranged on the grout injection pipe and the secondary mixing of the double grout in the mixing cavity, so as to ensure the uniformity of the double grout mixing. It should be noted that, the convergent structure inside the shooting pot is necessary, and if an expansion pipe or a flat pipe is adopted, the structure matched with the through hole can not achieve the expected mixing effect, and the Venturi effect can not occur.
Preferably, the outer shell comprises a first shell section and a second shell section, the first shell section and the second shell section are connected through a detachable and fixedly connected connecting sleeve, the connecting sleeve is provided with a plurality of through holes for communicating the first shell section and the second shell section, and one end of any through hole, which is close to the mixing cavity, is provided with the wire drawing nozzle; the second channel consists of an annular space formed between the inner wall of the first shell section and the outer side wall of the first channel and a plurality of through holes; the first channel and the second channel are intersected in a mixing cavity arranged in the second shell section; a plurality of groups of spiral deflectors are alternately arranged on the pipe wall of the second shell section at the downstream of the mixing cavity along the flow direction of the fluid, and the guiding directions of two adjacent groups of spiral deflectors are opposite; any group of the spiral guider at least consists of three spiral blades which are positioned at the same axial position and are uniformly distributed on the inner wall of the second shell section. After the double slurry is mixed by the mixing cavity, when the double slurry flows through the downstream pipe wall, the mixed double slurry flows along the guide of the spiral guide due to the contact with the spiral guide; however, the spiral guider is provided with a plurality of groups, and the guiding directions between two adjacent groups are opposite, namely the front group of spiral guider is used for guiding clockwise, the rear group of spiral guider is used for guiding anticlockwise, and so on. The circulation of the forward flow → the turbulent flow → the reverse flow → the turbulent flow → the forward flow is repeated while the mixed slurry flows, and the mixed slurry is mixed more uniformly after a plurality of circulations. The guide direction of any helical blade of the same group is the same, and each helical blade is fixedly arranged on the pipe wall. The structure is compact, simple and reliable without any movable component.
In order to reliably fix the mixer, preferably, a mixed slurry inlet pipe detachably and fixedly connected with the mixed slurry outlet pipe through a wire connector penetrates through the hydraulic plug; fixed and relative set up in mix thick liquid advances a pair of fixed joint on the thick liquid circumference lateral wall, connect two fixed joint's rubber tube to and set up arbitrary be used for the intercommunication on the fixed joint the rubber tube inner wall advances the water pressure stopper pipe in the space between the thick liquid outer wall with mixed thick liquid.
In order to improve the adaptability and compatibility of the hydraulic plug to different geological environments, preferably, a fixed joint which is not provided with a hydraulic plug pipe is replaced by a movable joint which is fixedly connected with the rubber pipe, and the movable joint is in sliding and sealing connection with the outer side wall of the night slurry inlet pipe; the inner side wall of the movable joint is provided with a plurality of sealing rings attached to the mixed slurry inlet pipe.
In order to improve the better plugging effect on the hole wall after the double-slurry mixed slurry is injected, the mixing ratio of the cement slurry to the water glass is 17: 0.9-1.1.
Advantageous effects
The double-slurry pouring construction method provided by the invention can be suitable for effectively blocking water gushing or leakage phenomena in the depth of each stratum in the drilling process of various geology. When a hole with larger preset depth is constructed, the invention can block water gushing layers or leakage layers at different depths without being influenced by depth limitation and water gushing degree.
The double-slurry mixer provided by the invention can fix the mixer at the position of the specified depth section, so that the pertinence and the accuracy of double-slurry plugging water burst are higher. The mixer adopts near the target area to mix the cement paste and the water glass paste, can solve simultaneously and solidify in advance and lead to stifled pipe and the downthehole inhomogeneous problem of mixing of two thick liquid, the targeted solution is two thick liquid and is poured the industry pain point and the technological difficulty in the shutoff technique.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1 is a schematic flow chart of the present application;
FIG. 2 is a schematic perspective view of the dual slurry mixer of the present application;
FIG. 3 is an axial cross-sectional view of the mixer of FIG. 2;
FIG. 4 is an enlarged view of the structure of region A in FIG. 3 (schematic of slurry mixing by Venturi principle);
FIG. 5 is an enlarged view of the structure of region A of FIG. 3 (another embodiment);
FIG. 6 is an enlarged view of the structure in area B of FIG. 3;
FIG. 7 is an axial cross-sectional view of the hydraulic plug of FIG. 2;
FIG. 8 is a schematic structural view of a hydraulic plug in a fixed state;
FIG. 9 is a schematic view of the structure of the hole after separation by the hydraulic plug;
FIG. 10 is a schematic structural view of example 4;
fig. 11 is an enlarged view of the structure of region C in fig. 10.
In the figure: 1-an outer shell; 2-water pressure plugging; 3-cement slurry inlet pipe; 4-a water glass slurry inlet pipe; 5-water pressure plug pipe; 6-a reverse valve; 7-steel ball; 8-a high-pressure spring; 9-connecting sleeves; 10-a through via; 11-a wire drawing nozzle; 12-a mixing chamber; 13-pair wire connectors; 14-slurry inlet pipe for mixed slurry; 15-fixing the joint; 16-a rubber tube; 17-a sealing ring; 18-a movable joint; 19-upper open cavity; 20-lower sealed cavity; 21-a slit; 22-ball check valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. 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 application.
In order to better illustrate the construction method claimed in the present application, and the double slurry mixer which plays a major role in the method, it is explained in detail in the following in the form of a practical case.
Example 1:
the embodiment is described by combining the actual construction case of the filtration hydropower station, and aims to clearly and thoroughly express the construction method and the obtained technical effects.
The Luding hydropower station is located in Luding county, Sichuan, and is a 12 th-level power station of the major river main stream. The normal water storage level of the reservoir is 1378.00m, the total reservoir capacity is 2.195 hundred million m3, the installed capacity is 920MW, and the project is a large-scale second-class project. The power station dam is a clay core rock-fill dam, is built on a covering layer, and has a dam crest elevation of 1385.50m and a maximum dam height of 79.50 m; the dam site riverbed covering layer is deep, the general thickness is 120 m-130 m, and the maximum thickness is 148.6 m. The riverbed part: 0+105.50m to 0+250.30m, wherein the dam foundation seepage-proofing system consists of three rows of grouting curtains connected with the lower part of a vertical concrete seepage-proofing wall, the thickness of the concrete seepage-proofing wall is 1m, the maximum depth is 110m, and the depth of a covering layer grouting curtain is about 40 m; the dam foundation seepage-proofing system at the two bank positions consists of a vertical concrete seepage-proofing wall and bedrock curtain grouting.
And 3, 31 days in 2013, water seepage is found at about 186m downstream of the water measuring weir on the right bank, the coordinate X of a water inrush point is 3313814.9, Y is 521975.9, the elevation is about 1306m, the water inrush point is positioned at 448m downstream of the dam axis, and the water inrush point is about 209m away from the dam toe. The initial flow of the water burst is about 5L/s, the ground of the water burst area collapses in 4 and 15 months in 2013, the flow is increased to about 200L/s, more fine particles of gray and black are gushed out, and the later flow is 188L/s-212L/s. Deformation such as ground cracking, riverbed collapse and the like occurs near the water burst point.
The engineering geology is explored as follows:
the dam site area valley covering layer is deep, the hierarchical structure is complex, the thickness is generally 120-. According to the material composition, distribution, cause, formation time and the like, the material is mainly divided into the following four seven sub-layers from bottom to top:
layer one: the boulder layer of floating (block) ovum (broken) is accumulated by ice water, the thickness is 51.85-75.31m, and the buried depth of the top plate is 62.2-81.8 m. The particle components mainly comprise weakly weathered granite and amphibole, and belong to strong to medium water permeability.
② -1 sublayer: the thickness of the boulder layer is 26.25-28.06m, the buried depth of the top plate is 46.2-56.8m, and the boulder layer belongs to strong-medium water permeability.
② 2, sublayer: crushed gravel soil layer with thickness of 8.2-79.45m and top plate buried depth of 1.85-68.2 m. The granular components are amphibole and granite, and the angular minor form is the main one, and belongs to strong to medium water permeability.
② -3 sublayers: the fine sand and the silt layer are spread on the middle lower part of the valley of the upper dam site in a lenticular shape, the thickness is 6.52-32.8m, and the top plate burial depth is 29.68-39.36 m. The water-permeable brick is mainly made of powder and fine sand, and has a silt layer at the bottom, and belongs to strong-medium water permeability.
③ 1, forming a sublayer: the soil layer containing floating (block) ovum (broken) gravel is spread on the first-level terrace of the dam site area and the right bank of the valley of the upper dam site, the thickness is 5.0-39.36m, and the top plate burial depth is 0-39.36 m. The coarse grain components mainly comprise weakly weathered granite and amphibole, and belong to strong-weak water-permeable soil.
And lens bodies of the layer III-1 b are silt in the mud-containing breccia and coarse sand which are distributed in a lens shape and belong to soil with weak water permeability.
③ 2, forming a sublayer: the gravel sand layer has the thickness of about 8.3m, mainly comprises medium and coarse sand, and belongs to medium water permeability.
Fourth layer: the bouldered boulder layer is distributed on the modern riverbed and the flood plain in the dam site area, and the thickness is 5.6-25.5 m. The granular components mainly comprise weakly weathered amphibole and granite, and belong to strong water permeability.
Because the sand layer is arranged in the part of the stratum, the hole collapse condition in the drilling process is very common, the influence on the construction progress is great, and the difficulty and the key point are how to treat the hole collapse. In order to solve the current technical problem, through repeated research, the applicant invents a brand-new double-slurry mixer and performs double-slurry filling by using the double-slurry mixer so as to solve the technical problems of water gushing, hole collapse, leakage and the like.
The construction method for drilling and pouring by using the double-slurry mixer shown in fig. 1 comprises the following steps:
step ST100 tool in place; assembling a double-slurry mixer comprising a mixer body and a hydraulic plug 2 for later use; see the structure shown in figure 2 for details.
ST200 geological survey is carried out to determine the mixing ratio of the double pulps; carrying out hole sweeping, crack flushing and water pressing tests on the target hole, and determining the mixing ratio of cement paste and water glass according to the conditions of the water pressing tests; the concrete hole sweeping construction sequence is as follows:
1, firstly, adopting a phi 60 composite sheet to lead a hole;
2, reaming by using a phi 75 composite sheet;
3 reaming by adopting a phi 91 composite sheet;
4, repairing the hole by adopting a short drilling tool with the diameter of 91 and the length of 1 m;
5, a long drilling tool with the diameter of 91 mm and the length of 2m is adopted for repairing the hole, so that the sleeve valve pipe can be smoothly arranged downwards.
Step ST300, system docking; respectively communicating the double-liquid-slurry mixer with a drill rod, a water glass slurry pipe and a water pressure plug pipe, and discharging the double-liquid-slurry mixer to a depth of 1-2 meters above the firstly found water inrush or leakage; in this embodiment, the distance between the double slurry mixer and the leakage/gush point is controlled to be 1 meter +/-0.2 meter. It is worth to be noted that the distance between the water burst point and the lower end part of the double-liquid-slurry mixer is controlled to be as small as possible, but the distance cannot be negative, otherwise, the water burst point is blocked, and double-slurry blocking cannot be realized; the maximum length is not more than 2 meters, when the distance is larger, the capacity of double grout contained in the hole is larger, grout is wasted, and meanwhile, the double grout is easy to solidify in the hole and cannot continue grouting, so that the hole wall plugging effect is poor, and even good plugging cannot be realized. Moreover, the difficulty of subsequent hole sweeping is obviously increased by excessive slurry residues in the hole, and the total amount of the double slurry penetrating into the hole wall is reduced. When leakage and water burst are found in the drilling process, the drilling is stopped immediately and the step is started.
Step ST400 hole sealing; injecting water into the water pressure plug pipe and pressurizing to make the water pressure plug 2 expand until a stable clamping structure is formed between the water pressure plug 2 and the hole wall, wherein the whole hole space is divided into an upper open cavity 19 and a lower closed cavity 20, as shown in fig. 9;
step ST500 double slurry injection; simultaneously injecting cement slurry with preset concentration into the drill rod and injecting water glass slurry into the water glass slurry pipe, wherein the injection amount and the grouting pressure are executed according to a preset scheme until grouting is finished;
step ST600, closing the system and taking out the tool; closing the cement slurry pipeline, the water glass slurry pipeline and the water pressure plug pipeline in sequence, taking out and cleaning the double-liquid-slurry mixer, and completing the current drilling and filling; continuing hole sweeping and drilling after the hole wall is blocked by leakage gushing water, and repeating the step ST100 to the step ST600 when secondary gushing water or leakage points are found; therefore, no matter what kind of complex stratum has water gushing and leakage to what degree, the hole wall can be plugged according to the construction method, secondary hole sweeping is carried out after plugging, if the hole sweeping resistance is small, the hole sweeping can be stopped for 5 minutes until the hole sweeping resistance or the hole sweeping drilling speed is normal. It is worth explaining that the hole can not be swept after the double-slurry mixed slurry stays at the bottom of the hole and is excessively dry-set after the double-slurry mixed slurry is cut for a long time, and the difficulty of secondary hole sweeping is increased.
In the above, it should be noted that the butt joint of the cement slurry pipes refers to the reliable and airtight connection of the cement slurry pipes for circulating the cement slurry, and the cement slurry pipes refer to the whole pipe through which the cement slurry flows alone, not to a certain structural member, but do not include the pipe through which the double-fluid slurry flows after being mixed.
The butt joint of the water glass slurry pipes refers to the airtight and reliable connection of water glass slurry pipelines for circulating water glass slurry, and the water glass slurry pipelines refer to pipelines through which the whole water glass slurry flows independently, do not refer to a certain structural part, but do not contain pipelines through which double-slurry is mixed.
The butt joint of the water pressure plug pipelines refers to the fact that the water pressure plug pipelines used for circulating clean water are connected in a sealed and reliable mode, the water pressure plug pipelines refer to the pipelines through which the whole clean water flows independently, do not refer to a certain structural part, and do not contain any other pipelines.
In this embodiment, the pressure parameters collected in the water pressure test in step ST200 are used to better select the specific gravity of the cement slurry and the ratio between the cement slurry and the water glass slurry, and through the trial and error of the applicant, the mixing ratio of the cement slurry and the water glass is controlled to be 17: 0.9-17: 1.1. Of course, as can be derived by those skilled in the art from the above, if the gushing water in the actual application scenario is more suitable for the weighted fiber slurry to be used with the water glass slurry, the technical content disclosed in the present application should be understood as well.
Example 2:
in order to better illustrate the originality of the present invention, and the principle and effect of the dual slurry mixer for achieving precise plugging, the dual slurry mixer is further explained based on the construction steps of embodiment 1.
First, the structure of the dual slurry mixer provided in this embodiment is as follows:
specifically, as shown in fig. 2-7, the double-fluid mixer includes an outer casing 1, and a reverse valve 6 fixedly disposed in the outer casing 1 and used for dividing an inner cavity of the outer casing 1 into a first passage and a second passage which are independent and closed, wherein the reverse valve 6 has a valve core for conducting the first passage in a one-way manner, ends of the first passage and the second passage are communicated with each other through a mixing chamber 12 disposed at a tail portion of the outer casing 1, and the mixing chamber 12 has an expanded structure and an axial cross section gradually converges in a fluid flowing direction;
the inlet end of the first channel is connected with a cement slurry inlet pipe 3, and the outlet end of the first channel is close to the mixing cavity 12 and is arranged in a converging manner along the axial section of the fluid flowing direction; the inlet end of the second channel is connected with a water glass slurry inlet pipe 4, the outlet end of the second channel is provided with a wire drawing nozzle 11, and the mixing cavity 12 is connected with a mixed slurry outlet pipe. The first channel is advanced the thick liquid pipe 3, case and intercommunication by the grout that connects gradually the penetrating pipe of hybrid chamber 12 is constituteed, the case includes high-pressure spring 8, and with high-pressure spring 8 supports to lean on the steel ball 7 that the contact is used for preventing the grout backward flow, penetrate the thick liquid intraduct along grout flow direction convergent gradually and with the crossing critical plane of hybrid chamber 12 is minimum cross section. The outer shell 1 comprises a first shell section and a second shell section, the first shell section and the second shell section are connected through a connecting sleeve 9 which is detachably and fixedly connected, the connecting sleeve 9 is provided with a plurality of through holes 10 which are communicated with the first shell section and the second shell section, and one end of any through hole 10, which is close to a mixing cavity 12, is provided with the wire drawing nozzle 11; the second channel consists of an annular space formed between the inner wall of the first shell section and the outer side wall of the first channel and a plurality of through holes 10; the first and second channels intersect in a mixing chamber 12 provided in the second housing section. The pipe wall of the second shell section located at the downstream of the mixing cavity 12 is alternately provided with a plurality of groups of spiral deflectors along the fluid flow direction, and the guiding directions of the two adjacent groups of spiral deflectors are opposite. Any group of the spiral guider at least consists of three spiral blades which are positioned at the same axial position and are uniformly distributed on the inner wall of the second shell section.
A mixed slurry inlet pipe 14 detachably and fixedly connected with the mixed slurry outlet pipe through a screw connector 13 penetrates through the water pressure plug 2; the fixed and relative setting in mix thick liquid advances a pair of fixed joint 15 on the thick liquid pipe 14 circumference lateral wall, connect two the rubber tube 16 of fixed joint 15 to and set up arbitrary fixed joint 15 is last to be used for the intercommunication the water pressure stopper pipe 5 in the space between the thick liquid pipe 14 outer wall is advanced to the rubber tube 16 inner wall and the mixed thick liquid.
The working principle is as follows:
when drilling construction is carried out, the slurry turning amount is found to be increased or obviously reduced, the phenomenon of water burst or leakage in the current stratum is shown, and drilling is stopped immediately according to standard construction steps. The following steps are carried out in sequence:
step ST100 tool in place; assembling a double-slurry mixer comprising a mixer body and a hydraulic plug 2 for later use; see the structure shown in figure 2 for details.
ST200 geological survey is carried out to determine the mixing ratio of the double pulps; carrying out hole sweeping, crack flushing and water pressing tests on the target hole, and determining the mixing ratio of cement paste and water glass according to the conditions of the water pressing tests;
step ST300, system docking; respectively communicating the double-liquid-slurry mixer with a drill rod, a water glass slurry pipe and a water pressure plug pipe, and discharging the double-liquid-slurry mixer to a depth of 1-2 meters above the firstly found water inrush or leakage; in this embodiment, the distance between the double slurry mixer and the leakage/gush point is controlled to be 1 meter +/-0.2 meter.
Step ST400 hole sealing; injecting water into the water pressure plug pipe and pressurizing to make the water pressure plug 2 expand until a stable clamping structure is formed between the water pressure plug 2 and the hole wall, wherein the whole hole space is divided into an upper open cavity 19 and a lower closed cavity 20, as shown in fig. 9;
step ST500 double slurry injection; simultaneously injecting cement slurry with preset concentration into the drill rod and injecting water glass slurry into the water glass slurry pipe, wherein the injection amount and the grouting pressure are executed according to a preset scheme until grouting is finished;
in the process of pouring, cement slurry is pressurized by a slurry conveying pump and then sequentially reaches the valve core position from the cement slurry inlet pipe 3 and the reverse valve 6, and as the valve core has the function of blocking the cement slurry from entering, when the pressure of the cement slurry conveyed by the slurry conveying pump is greater than the pressure of the valve core, the cement slurry overcomes the resistance of the valve core and enters the mixing cavity 12 after entering the valve core. Meanwhile, the water glass is pressurized and conveyed to the water glass slurry inlet pipe 4 through the slurry conveying pump, enters the second channel, and is finally conveyed into the mixing cavity 12 through the wire drawing nozzle 11 according to a preset form to be mixed with the cement slurry in the first channel. Because mixing chamber 12 has the structure of expanding, can reduce the velocity of flow after grout gets into the structure of expanding and fully mix with the sodium silicate thick liquid after the wire drawing, moreover, mixing chamber 12 is the convergence structure setting along the fluid circulation direction, further forms the extrusion to the thick liquid after the mixture, changes the misce bene state of mixed thick liquid, further promotes thick liquid misce bene degree. The double slurry is fully mixed in the mixing cavity 12 and then enters the hole through the slurry outlet pipe of the mixed slurry to form a preset depth section for plugging the hole wall of the water gushing hole section. The steel ball that this embodiment adopted the sphere is as case component purpose can provide reliable sealed and prevent the effect of backflowing in the grout that contains granular impurity, and the steel ball is sealed for the line seal, can avoid the particulate matter in the grout naturally, compares in the sealed check valve of face and has better practicality and the adaptability to the environment. The inner channel is arranged to form the convergent grout injection pipe, so that the grout can be accelerated when flowing in the grout injection pipe, the cross section of the grout leaving the grout injection pipe and passing through the grout injection pipe at the moment is the smallest, the flow rate of the grout is the fastest at the moment, when the grout enters the mixing cavity 12 at the maximum speed, local negative pressure can be formed, the grout sucking the side of the grout injection pipe at the moment forms local rotational flow, the internal rotational flow is similar to the Venturi effect, and the grout injection pipe can play a positive promoting role in fully mixing the grout injection pipe and the grout injection pipe. After the rotational flow, the mixing cavity 12 is expanded compared with the shooting pipe and then rapidly decelerated, a limited turbulent flow effect is formed in the mixing cavity 12, and then the mixing cavity 12 with a convergent tail section is matched, so that the slurry is further uniformly mixed. Still be provided with the through-hole that sets up along fluid flow direction slope on shooting the thick liquid pipe, because the grout in shooting the arrow pipe is more and more fast along flow direction, then according to the venturi principle, be close to shooting the setting of thick liquid pipe end portion more the through-hole, the water glass that lies in the side space can be easier gets into shooting thick liquid pipe and grout mix, in grout and the water glass thick liquid mixes back and jets out together and get into mixing chamber 12, repeats like the secondary mixing process that fig. 4 shows for two thick liquids mix more fully. After the double slurry is mixed by the mixing cavity 12, when the double slurry flows through the downstream pipe wall, the mixed double slurry flows along the guide of the spiral guide due to the contact with the spiral guide; however, the spiral guider is provided with a plurality of groups, and the guiding directions between two adjacent groups are opposite, namely the front group of spiral guider is used for guiding clockwise, the rear group of spiral guider is used for guiding anticlockwise, and so on. The circulation of the mixed slurry flow → the forward flow → the turbulent flow → the reverse flow → the turbulent flow → the forward flow is repeated as shown in fig. 6, and the arrow in fig. 6 indicates the spiral direction of the slurry flow, and the mixed slurry is mixed more uniformly after a plurality of circulations. In this embodiment, the mixed slurry will undergo a maximum of three times of mixing, the first primary mixing being by suction mixing according to the venturi principle through the through-holes provided in the shooting pipe as shown in fig. 5; the second mixing is mixing in the mixing chamber 12, as shown in FIG. 4; the third mixing is mixing through a spiral guider, as shown in fig. 6, so that the sufficiency of double-slurry mixing can be ensured, the effectiveness of gushing water plugging is ensured, and the problem of poor plugging or secondary gushing water is solved.
Step ST600, closing the system and taking out the tool; closing the cement slurry pipeline, the water glass slurry pipeline and the water pressure plug pipeline in sequence, taking out and cleaning the double-liquid-slurry mixer, and completing the current drilling and filling; and when the hole wall is leaked and gushed, water is blocked, and hole sweeping and drilling are continued.
Example 3:
in this embodiment, the hole sealing step in step ST400 is described in detail with reference to the structure of the hydraulic plug 2, and in addition to embodiment 2, with reference to fig. 7 to 9, a mixed slurry inlet pipe 14 detachably and fixedly connected to the mixed slurry outlet pipe through a screw connector 13 is disposed through the hydraulic plug 2; the fixed and relative setting in mix thick liquid advances a pair of fixed joint 15 on the thick liquid pipe 14 circumference lateral wall, connect two the rubber tube 16 of fixed joint 15 to and set up arbitrary fixed joint 15 is last to be used for the intercommunication the water pressure stopper pipe 5 in the space between the thick liquid pipe 14 outer wall is advanced to the rubber tube 16 inner wall and the mixed thick liquid.
The working principle is as follows: after the mixer is sent to a specified depth, clear water is conveyed into the water pressure plug pipe 5 through a pipeline by ground pressurization equipment, the rubber pipe 16 is continuously stressed and expanded with the increase of clear water injection, and the rubber pipe 16 is continuously expanded and enlarged under the action of water pressure until the rubber pipe is contacted with the hole wall because a closed structure is arranged between the fixed structure 15 and the mixed slurry inlet pipe 14. As shown in fig. 8, at this time, as the rubber tube 16 continuously increases, the outer surface of the rubber tube 16 collides with the hole wall to form a large extrusion force, so that the rubber tube 16 and the hole wall are stationary due to a large static friction force to perform a fixing function. At this time, the slurry mixed by the mixer enters the hole with the designated depth section through the slurry mixing inlet pipe 14 to implement water gushing blocking. Due to the action of the water pressure plug pipe 5, the hole is divided into an upper open cavity 19 and a lower closed cavity 20, specifically, as shown in fig. 9, when the lower closed cavity 20 is plugged, the mixed slurry cannot enter the hole of the upper open cavity 19, and therefore the pertinence and accuracy of plugging are achieved. By adopting the operation, the plugging technical effect is obvious, and the consumed slurry amount can be minimized. When deep hole construction is needed, when water gushes from the porous section, a section can be constructed and blocked up to a preset depth. The method of the embodiment can meet the requirements of the existing drilling holes with various large depths and various difficult and complicated geological conditions.
The embodiment is based on the same inventive concept, and provides another independent optimization scheme, namely, a fixed joint 15 which is not provided with the water pressure plug pipe 5 in the structure is replaced by a movable joint 18 which is fixedly connected with the rubber pipe 16, and the movable joint 18 is connected with the outer side wall of the night soil inlet pipe 14 in a sliding and sealing mode through the mixing pipe.
In order to meet the back-and-forth sliding requirement of the movable structure 18 and better realize the sealing effect, preferably, the inner side wall of the movable joint 18 is provided with a plurality of sealing rings 17 attached to the mixed slurry inlet pipe 14. The mode that sets up sealing washer 17 can be further reduce the surface roughness requirement and the fit tolerance requirement between the movable joint 18 internal diameter and the mixed thick liquid advance thick liquid pipe 14 external diameter for the processing degree of difficulty is lower, and the convenient degree of follow-up maintenance is higher, and the maintenance cost is cheaper, and is convenient. The use of the movable joint 18 enables the pressure increase in the hydraulic plug tube 5 to be significantly reduced for the same fixed effect. Due to the adoption of the movable joint 18, after the rubber tube 16 is pressurized, the rubber tube 16 radially expands and becomes larger, and the axial length is further shortened, so that the deformation of the rubber tube 16 is facilitated, and the problem that the rubber tube 16 cannot be reliably abutted and fastened due to the fact that the hole wall of the rubber tube 16 is loose in geology and can only be caused by radial expansion because the rubber tube 16 cannot be axially shortened is greatly reduced. During the continuous pressurization process, the rubber tube 16 is subjected to a pressure exceeding the expansion limit and bursts. After the fixed joint 15 is replaced by the movable joint 18, the rubber tube 16 with the same material and size can obviously enlarge the effective radial expansion range while shortening the axial length, is more effective in dealing with loose geological conditions, and avoids the problem of explosion due to over-expansion. Meanwhile, after the movable joint 18 is adopted, the requirement on ground supercharging equipment is also obviously reduced, so that the requirement on a pipeline connected with the water pressure plug pipe 5 is also reduced, the investment on material cost is obviously reduced, and the service life is prolonged.
Example 4:
the present embodiment is a technical solution parallel to embodiment 2, and specifically, as shown in fig. 10 and 11, the upper end of the connecting sleeve 9 is provided with a plurality of through holes 10, the lower end of the connecting sleeve is provided with a plurality of annularly arranged slits 21 communicated with any through hole 10, the slits 21 may be concentrically arranged in multiple layers to meet different water glass flow requirements, but any layer of slits 21 is communicated with the through holes 10 and used for discharging water glass slurry to the mixing chamber 12. The design using the slit 21 has advantages over the wire drawing nozzle 11 of embodiment 2: firstly, the cross section area of the end face of the same connecting sleeve 9 can have larger flow, and the limited maximum flow limit caused by the adoption of the wire-drawing nozzle 11 is avoided; secondly, the design of the slit 21 can be in a micron level, so that the backflow of cement slurry is prevented, and the problem of coagulation and blockage in the connecting sleeve 9 is caused. When the minimum distance of the slits 21 is smaller than the particle size of cement paste particles, the backflow of the cement paste can be effectively blocked, and the occurrence of pipe blockage is avoided. When the design of the slits 21 with small pitches is adopted, the problem that the flow demand of the water glass slurry cannot be met can be solved by increasing the number of the stages of the slits 21 or expanding the pitches of the slits 21; when the distance between the slits 21 is enlarged to increase the flow rate of the water glass slurry, the spherical check valve 22 is required to be arranged at the upper end of the connecting sleeve 9 for performing a check function, so that the cement slurry is blocked at the downstream of the connecting sleeve 9, and further pipe blockage is avoided. Of course, as a person skilled in the art, when the dual-fluid slurry mixer of the present embodiment is used, the cement slurry pressurization pipeline must be turned off first, and then the water glass slurry pressurization pipeline must be turned off, so as to further avoid the occurrence of pipe blockage due to backflow mixing caused by the fact that the pressure of the cement slurry conveying pipeline is higher than the pressure of the water glass slurry conveying pipeline. Thus, triple insurance is formed to avoid pipe blockage.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (9)
1. A construction method for drilling and pouring by adopting a double-slurry mixer is characterized by comprising the following steps: the method comprises the following steps:
step ST100 tool in place; assembling a double-slurry mixer comprising a mixer body and a hydraulic plug (2) for later use;
ST200 geological survey is carried out to determine the mixing ratio of the double pulps; carrying out hole sweeping, crack flushing and water pressing tests on the target hole, and determining the mixing ratio of cement paste and water glass according to the conditions of the water pressing tests;
step ST300, system docking; respectively communicating the double-liquid-slurry mixer with a drill rod, a water glass slurry pipe and a water pressure plug pipe, and discharging the double-liquid-slurry mixer to a depth of 1-2 meters above the firstly found water inrush or leakage;
step ST400 hole sealing; injecting water into the water pressure plug pipe and pressurizing to enable the water pressure plug (2) to expand until a stable clamping structure is formed between the water pressure plug (2) and the hole wall, wherein the whole space in the hole is divided into an upper open cavity (19) and a lower closed cavity (20);
step ST500 double slurry injection; simultaneously injecting cement slurry with preset concentration into the drill rod and injecting water glass slurry into the water glass slurry pipe, wherein the injection amount and the grouting pressure are executed according to a preset scheme until grouting is finished;
step ST600, closing the system and taking out the tool; closing the cement slurry pipeline, the water glass slurry pipeline and the water pressure plug pipeline in sequence, taking out and cleaning the double-liquid-slurry mixer, and completing the current drilling and filling; and (6) continuing hole sweeping and drilling after the hole wall is blocked by leakage gushing water, and repeating the step ST100 to the step ST600 when secondary gushing water or leakage points are found.
2. The construction method for drilling and pouring by using the double-slurry mixer as claimed in claim 1, wherein: the double-liquid-slurry mixer is composed of a mixer body for mixing cement slurry and water glass and a water pressure plug (2) for fixing the mixer body in a hole at a specified depth and detachably connected below the mixer body.
3. The construction method for drilling and pouring by using the double-slurry mixer as claimed in claim 2, wherein: the mixer body comprises an outer shell (1), and a reverse valve (6) fixedly arranged in the outer shell (1) and used for dividing an inner cavity of the outer shell (1) into a first independent and closed channel and a second independent and closed channel, wherein the reverse valve (6) is provided with a valve core for conducting the first channel in a one-way mode, the tail ends of the first channel and the second channel are communicated through a mixing cavity (12) arranged at the tail part of the outer shell (1), the mixing cavity (12) is provided with an expanded structure, and the axial section of the mixing cavity is gradually converged along the flowing direction of a fluid; the inlet end of the first channel is connected with a cement slurry inlet pipe (3), and the outlet end of the first channel is close to the mixing cavity (12) and is arranged in a converging manner along the axial section of the fluid flowing direction; the inlet end of the second channel is connected with a water glass slurry inlet pipe (4), the outlet end of the second channel is provided with a wire drawing spray head (11), and the mixing cavity (12) is connected with a mixed slurry outlet pipe.
4. The construction method for drilling and pouring by using the double-slurry mixer as claimed in claim 3, wherein: the first channel consists of a cement slurry inlet pipe (3), a valve core and a slurry shooting pipe communicated with the mixing cavity (12), wherein the cement slurry inlet pipe, the valve core and the slurry shooting pipe are sequentially connected, the valve core comprises a high-pressure spring (8) and a steel ball (7) which is abutted against and contacted with the high-pressure spring (8) and used for preventing cement slurry from flowing back, the inner part of the slurry shooting pipe gradually converges along the flowing direction of the cement slurry, and the cross critical surface of the slurry shooting pipe and the mixing cavity (12) is the minimum cross section; and the side wall of the grout injection pipe is provided with a plurality of through holes for absorbing water glass grout.
5. The construction method for drilling and pouring by using the double-slurry mixer as claimed in claim 4, wherein: the outer shell (1) comprises a first shell section and a second shell section, the first shell section and the second shell section are connected through a detachable and fixedly connected connecting sleeve (9), the connecting sleeve (9) is provided with a plurality of through holes communicated with the first shell section and the second shell section, and one end of any through hole, close to the mixing cavity (12), is provided with the wire drawing nozzle (11); the second channel consists of an annular space formed between the inner wall of the first shell section and the outer side wall of the first channel and a plurality of through holes; the first channel and the second channel are intersected in a mixing cavity (12) arranged in the second shell section; a plurality of groups of spiral deflectors are alternately arranged on the pipe wall of the second shell section at the downstream of the mixing cavity (12) along the flow direction of the fluid, and the guiding directions of two adjacent groups of spiral deflectors are opposite; any group of the spiral guider at least consists of three spiral blades which are positioned at the same axial position and are uniformly distributed on the inner wall of the second shell section.
6. The construction method for drilling and pouring by using the double fluid-slurry mixer as claimed in any one of claims 1 to 5, wherein: a mixed slurry inlet pipe (14) detachably and fixedly connected with the mixed slurry outlet pipe through a screw connector (13) penetrates through the water pressure plug (2); fixed and relative set up in mix thick liquid advances a pair of fixed joint (15) on thick liquid pipe (14) circumference lateral wall, connect two rubber tube (16) of fixed joint (15) and set up arbitrary be used for the intercommunication on fixed joint (15) rubber tube (16) inner wall and mix thick liquid and advance water pressure cock pipe (5) in the space between thick liquid pipe (14) outer wall.
7. The construction method for drilling and pouring by using the double-slurry mixer as claimed in claim 6, wherein: replacing a fixed joint (15) which is not provided with a water pressure plug pipe (5) with a movable joint (18) which is fixedly connected with the rubber pipe (16), wherein the movable joint (18) is connected with the outer side wall of the mixing night milk inlet pipe (14) in a sliding and sealing manner; the inner side wall of the movable joint (18) is provided with a plurality of sealing rings (17) which are attached to the mixed slurry inlet pipe (14).
8. The construction method for drilling and pouring by using the double-slurry mixer as claimed in claim 1, wherein: the mixing ratio of the cement paste to the water glass is 17: 0.9-1.1.
9. The construction method for drilling and pouring by using the double-slurry mixer as claimed in claim 4, wherein: the outer shell (1) comprises a first shell section and a second shell section, the first shell section and the second shell section are connected through a detachable and fixedly connected connecting sleeve (9), the connecting sleeve (9) is provided with a plurality of through holes (10) which are communicated with the first shell section and the second shell section, and one end, close to the mixing cavity (12), of each through hole (10) is communicated through at least one annular slit (21); the second channel consists of an annular space formed between the inner wall of the first shell section and the outer side wall of the first channel and a plurality of through holes (10); the upper end of the through hole (10) is detachably connected with a ball-shaped one-way valve (22) for preventing backflow.
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