Rapid slurry preparation system for shield synchronous double-liquid grouting construction

Abstract

The invention discloses a rapid slurry preparation system for shield synchronous double-liquid grouting construction, which is used for rapidly preparing cement-water glass slurry (C-S slurry) based on a four-step combination mode of jet impact, double-paddle stirring, closed pipeline reciprocating circulation and double-helix high-speed rotational flow powerful mixing. The preparation of slurry required in the shield synchronous double-liquid grouting construction process can be quickly realized with high quality, the requirements of quick tunneling synchronous grouting construction of a shield tunnel can be well met, and the high efficiency and safety of shield tunnel construction are effectively promoted; the device has the remarkable advantages of simple structure, reliable performance, safety and convenience in operation, low comprehensive cost and the like.

Description

Technical Field

[0001] The present invention belongs to the technical field of shield tunneling construction, and particularly relates to a rapid slurry preparation system for shield synchronous double-fluid grouting construction. Background Art

[0002] Shield synchronous grouting is an indispensable key technical link in shield tunneling construction, mainly used to fill the gap between the segment and the surrounding strata during the process of the shield machine advancing forward to excavate the tunnel. This gap is caused by the fact that the excavation radius of the shield machine cutter head is larger than the outer diameter of the segment. If not filled in time, it may cause a series of problems such as ground settlement (deformation), uneven stress on the segments, and instability of the tunnel structure, and even affect the safety of surrounding buildings (structures). Synchronous grouting is to inject a slurry with coagulation and hardening characteristics into the gap between the segment at the shield tail and the strata while the shield machine is advancing forward to excavate the tunnel, in order to quickly fill the gap. After the slurry is solidified, it forms a stone body with a certain strength, which can ensure the close combination of the segment and the strata, enhance the integrity and waterproofness of the shield tunnel, and has multiple functions such as supporting and stabilizing the strata, controlling ground settlement (deformation), stabilizing the segments, forming a waterproof barrier outside the segments, and preventing groundwater leakage.

[0003] Generally speaking, the grouting materials used in synchronous grouting usually include cement, bentonite, stabilizer, accelerator, retarder, etc., and can be divided into two categories: single-fluid slurry and double-fluid slurry according to engineering requirements. Among them, the single-fluid slurry is mainly composed of cement-based materials, while the double-fluid slurry is a cement-sodium silicate slurry (C-S slurry) formed by mixing two different liquids (such as cement slurry and sodium silicate) in a certain ratio. The double-fluid slurry has the characteristics of short gelling time and high early strength, and is particularly suitable for soft soil strata and water-rich strata. It should be said that the double-fluid synchronous grouting technology is an important application and development direction in shield tunnel construction in recent years, and its main characteristics include: (1) Rapid curing. After the A liquid (cement-based slurry) and the B liquid (chemical slurry such as sodium silicate) in the double-fluid slurry are mixed, they can quickly undergo a chemical reaction to form a high-strength solidified body, which can effectively prevent slurry leakage and ground settlement. (2) Strong adaptability. The gelling time and strength of the double-fluid slurry can be adjusted according to engineering requirements, and it is suitable for different geological conditions, especially performing excellently in water-rich strata with a large permeability coefficient. (3) Environmental protection. Compared with the traditional grouting process, the double-fluid synchronous grouting technology can effectively reduce the generation of waste and reduce the impact on the environment, meeting the requirements of green construction.

[0004] At present, when preparing the required cement-sodium silicate slurry (C-S slurry), two sets of slurry mixing devices are often used, as well as a special double-fluid grouting pump and mixer to mix the two. The slurry preparation process is often cumbersome, slow (low efficiency), and time-consuming. The stirring and mixing degree of the prepared double-fluid slurry does not meet the standard (is not sufficient), making it difficult to meet the actual needs of rapid tunneling construction of shield tunnels. This is particularly evident in the working conditions of complex geological conditions and rapid tunneling construction of shields, where it is necessary to synchronously and rapidly prepare slurry for long-term continuous grouting. Based on this, the present invention proposes a rapid preparation system for cement-sodium silicate slurry (C-S slurry) under a quadruple composite mode of "jet impact + double paddle stirring + closed pipeline reciprocating circulation + double helix high-speed swirling and strong mixing". Summary of the Invention

[0005] In order to solve the technical problems existing in the background technology, the purpose of the present invention is to provide a rapid preparation system for slurry used in synchronous double-fluid grouting construction of shields.

[0006] In order to solve the technical problems, the technical solution of the present invention is as follows:

[0007] A rapid preparation system for slurry used in synchronous double-fluid grouting construction of shields, the system includes: a cement slurry preparation device, a three-stage mixing tank, a spiral jet type double-fluid mixer, and a circulation pump II; the three-stage mixing tank is connected to the circulation pump II and then connected to the inlet pipe of the spiral jet type double-fluid mixer to transport sodium silicate together, and the cement slurry preparation device is connected to the second inlet pipe of the spiral jet type double-fluid mixer to transport cement slurry; the spiral jet type double-fluid mixer is used to fully mix the cement slurry and sodium silicate and spray it outwards.

[0008] Among them, the cement slurry preparation device is driven by compressed air or pumped by a circulation pump.

[0009] Further, the cement slurry preparation device driven by compressed air includes: a first-stage mixing tank, a dry powder storage and transportation tank, a second-stage mixing tank, an air compressor, a stop valve, a Venturi injector, a circulation pump I, and a three-way reversing valve;

[0010] The air compressor is connected to the first-stage mixing tank, the main inlet end of the Venturi injector is installed at the outlet end of the stop valve, the outlet end of the first-stage mixing tank is connected to the stop valve and the Venturi injector and then connected to the inlet end of the second-stage mixing tank, the dry powder storage and transportation tank is connected to the secondary inlet end of the Venturi injector, the outlet end of the second-stage mixing tank is sequentially connected to the circulation pump I, the three-way reversing valve and then connected to the return liquid port of the first-stage mixing tank, and the three-way reversing valve is connected to the second inlet pipe of the spiral jet type double-fluid mixer.

[0011] Furthermore, the cement slurry preparation device based on circulation pump suction pumping comprises: a primary mixing tank, a dry material powder storage and transportation tank, a secondary mixing tank, a stop valve, a venturi ejector, a circulation pump 1, a three-way reversing valve and a circulation pump 3;

[0012] The main inlet end of the venturi ejector is installed at the outflow end of the stop valve, the outflow end of the first-level stirring tank is connected to the circulation pump 3, the stop valve and the venturi ejector, and then connected to the inflow end of the second-level stirring tank, the dry material powder storage and transportation tank is connected to the secondary inflow end of the venturi ejector, the outflow end of the second-level stirring tank is connected to the circulation pump 1, the three-way reversing valve in sequence, and then connected to the liquid return port of the first-level stirring tank, and the three-way reversing valve is connected to the liquid inlet pipe 2 of the spiral jet type two-liquid mixer.

[0013] Furthermore, the first-stage stirring tank comprises: a first-stage cover plate, a first-stage tank body, a first-stage tank bottom built-in paddle, a first-stage variable frequency motor and a first-stage liquid outlet;

[0014] The primary cover plate is provided with a primary handle, a primary air / liquid inlet for injecting compressed air or water into the primary tank body, a liquid return port for returning cement slurry to form a closed cycle, and an exhaust valve for releasing the compressed air residing in the primary tank body;

[0015] The first-level cover plate is sealed and connected to the first-level tank body, the first-level tank bottom built-in paddle is arranged at the bottom inside the first-level tank body, the first-level variable frequency motor is arranged at the bottom outside the first-level tank body, the first-level tank bottom built-in paddle responds to the first-level variable frequency motor, the first-level liquid outlet is arranged at the bottom of the first-level tank body, and a stop valve is also provided at the first-level liquid outlet, which can realize the opening / closing of the first-level liquid outlet according to actual needs.

[0016] Furthermore, the dry material powder storage and transportation tank is used to add powder dry material for quickly preparing cement slurry, and the dry material powder storage and transportation tank includes: an aggregate cone, a tank body, a tank bottom, a feed chamber, a rotating shaft wing plate, telescopic legs and spiral blades;

[0017] Among them, the aggregate cone is an inverted cone structure, the aggregate cone, the tank body and the tank bottom are internally connected, the feed chamber is obliquely intersected with the tank bottom and internally connected, the feed chamber and the tank bottom are flexibly connected and sealed, the spiral blade is coaxially arranged in the feed chamber, one end of the spiral blade extends into the bottom of the tank bottom, and the other end is close to the secondary inflow end of the venturi ejector, the shaft wing is arranged under the outer wall of the feed chamber, and the telescopic legs are hinged to the shaft wing; when the dry material powder is poured downward from the top of the aggregate cone, through the tank body to the tank bottom, the rotating spiral blade transports the dry material powder obliquely upward through the feed chamber to the secondary inflow end of the venturi ejector.

[0018] Furthermore, the secondary stirring tank comprises: a secondary cover plate, a secondary tank body, a secondary liquid inlet pipe, a nozzle, a built-in paddle at the bottom of the secondary tank, a secondary variable frequency motor and a secondary liquid outlet;

[0019] A secondary handle is installed on the secondary cover plate. The secondary cover plate is hermetically connected to the secondary tank body. The secondary liquid inlet pipe is horizontally installed on the side of the secondary tank body, and a part of the secondary liquid inlet pipe extends into the interior of the secondary tank body. The nozzle is connected to one end of the secondary liquid inlet pipe that extends into the interior of the secondary tank body, and the other end of the secondary liquid inlet pipe communicates with the circulation pipeline. A paddle is built into the bottom of the secondary tank body and is arranged at the bottom of the secondary tank body and is driven to rotate by a secondary variable-frequency motor. A secondary liquid outlet for discharging the slurry stored inside the secondary tank body is also provided at the bottom of the secondary tank body, and a stop valve is also provided at the secondary liquid outlet, and the opening / closing of the secondary liquid outlet can be realized according to actual needs.

[0020] Furthermore, the tertiary mixing tank is used to prepare sodium silicate required for double-fluid synchronous grouting. According to a preset ratio, the required sodium silicate and water are respectively added into the tertiary mixing tank. In the tertiary mixing tank, a hand-held or fixed mixer is used to stir until the sodium silicate is fully dissolved to form sodium silicate solution. An outlet is provided on the side of the bottom of the tertiary mixing tank, and a stop valve is provided at the outlet, and the opening / closing of the outlet can be realized according to actual needs.

[0021] Furthermore, the screw jet type double-fluid mixer includes: a primary mixing chamber, a first spiral flow channel, a second spiral flow channel, a secondary mixing chamber, and a tertiary mixing chamber;

[0022] The sodium silicate solution prepared in the tertiary mixing tank is pumped to the first inlet pipe by a second circulation pump and then flows into the first spiral flow channel. The cement slurry prepared in the secondary mixing tank is pumped along the circulation pipeline by a first circulation pump to a three-way reversing valve, then flows along the circulation pipeline into the second inlet pipe, and then flows into the second spiral flow channel. The sodium silicate solution and the cement slurry respectively flow in a spiral shape at a high speed in the primary mixing chamber along the first spiral flow channel and the second spiral flow channel. When the two fluids flow through the primary mixing chamber, they enter the secondary mixing chamber with an inverted cone contraction shape, and the two fluids are spirally wound together for strong mixing. Then the mixed liquid of the two fluids flows into the tertiary mixing chamber with a small inner diameter and is strongly mixed again to form the required cement-sodium silicate C-S slurry, which is finally sprayed outwards.

[0023] Furthermore, in the first working process of the system, compressed air output by an air compressor is used as the primary power to drive the reciprocating circulation of the fluid, specifically including:

[0024] Based on the preset water-cement ratio and quality of the cement slurry, water required for preparing the cement slurry is added to the primary tank, and the air compressor is started to output compressed air to the outside, which flows into the primary air / liquid inlet through the circulation pipeline and then flows into the primary tank. The stop valve set at the primary liquid outlet is opened, and the water in the primary tank flows through the primary liquid outlet and along the circulation pipeline to the stop valve under the drive of compressed air. The spiral blade is started to transport the cement dry material powder for preparing the required cement slurry to the secondary inlet end of the Venturi ejector. The stop valve is opened, and the fast-flowing water driven by compressed air generates a strong negative pressure suction when passing through the Venturi ejector. The cement slurry is sucked up by the force, and the water flows into the secondary liquid inlet pipe together with the cement slurry, and then sprays out from the nozzle at a high speed to form a cement slurry jet. The cement slurry jet hits the inner wall of the secondary tank body, rebounds, splashes around and falls back to the bottom of the secondary tank body, and the secondary variable frequency motor is started to drive the built-in paddles at the bottom of the secondary tank to rotate, further stirring the cement slurry at the bottom of the secondary tank body, accelerating the preparation of the required cement slurry and preventing the solid phase precipitation in the cement slurry. The stop valve set at the secondary liquid outlet is opened, and the circulation pump is started to suck and pump the cement slurry in the secondary tank body out of the secondary liquid outlet, and flows along the The circulation pipeline flows through the circulation pump and the three-way reversing valve and then flows into the return liquid port, so that the cement slurry flows into the first-stage tank body, starts the first-stage variable frequency motor, drives the built-in paddle at the bottom of the first-stage tank, stirs the cement slurry in the first-stage tank body, accelerates the preparation of the required cement slurry, and prevents the solid phase precipitation in the cement slurry. Driven by compressed air, the cement slurry in the first-stage tank body flows again through the first-stage liquid outlet and along the circulation pipeline to the stop valve and the Venturi ejector. Under the action of the strong negative pressure suction force, the prepared cement slurry again entrains the cement dry material powder transported by the spiral blades and flows into the circulation pipeline together. The secondary liquid inlet pipe then sprays outward at high speed from the nozzle to form a cement slurry jet. The cement slurry jet hits the inner wall of the secondary tank body, rebounds, splashes around and falls back to the bottom of the secondary tank body. The rotating paddles built into the bottom of the secondary tank further stir the cement slurry at the bottom of the secondary tank body, accelerate the preparation of the required cement slurry, and prevent the solid phase precipitation in the cement slurry. The circulation pump suction pumps the cement slurry in the secondary tank body to flow out from the secondary liquid outlet, flows along the circulation pipeline through the circulation pump, the three-way reversing valve, and then flows into the return liquid port. The cement slurry flows into the primary tank body, and the cycle is repeated until the required cement slurry is quickly prepared.

[0025] Then, according to the ratio and quality of sodium silicate required in the preparation of C-S slurry, the required sodium silicate and water are respectively added to the three-stage stirring tank, and stirred until the sodium silicate is fully dissolved to form the required sodium silicate; the stop valve at the bottom side outlet of the three-stage stirring tank is opened, the second circulation pump is started, and the sodium silicate staying in the three-stage stirring tank is sucked and pumped along the circulation pipeline into the first inlet pipe; meanwhile, the passage of the three-way reversing valve is adjusted so that the prepared cement slurry sucked and pumped by the first circulation pump from the secondary tank flows along the circulation pipeline through the three-way reversing valve and then into the second inlet pipe; at this time, the sodium silicate and the cement slurry will respectively flow forward rapidly in a spiral shape along the first spiral flow path and the second spiral flow path in the primary mixing chamber. When the two fluid streams flow through the primary mixing chamber and enter the secondary mixing chamber, the two fluid streams are wound around each other in a spiral shape for strong mixing, and then the mixed liquid of the two fluid streams flows into the tertiary mixing chamber with a small inner diameter for strong mixing again, and finally sprays outwards.

[0026] Further, in the second working process of the system, the third circulation pump is used to suck and pump the fluid in the primary tank as the primary power for driving the fluid to reciprocate and circulate, specifically including:

[0027] Based on the preset water-cement ratio and quality of the cement slurry, water required for preparing the cement slurry is added to the primary tank through the primary air / liquid inlet, and the circulation pump 3 is started to pump the water stored in the primary tank. The stop valve set at the primary liquid outlet is opened, and the water in the primary tank flows through the primary liquid outlet and along the circulation pipeline to the stop valve under the suction pumping of the circulation pump 3. The spiral blade is started to convey the cement dry material powder for preparing the required cement slurry to the secondary inlet end of the Venturi ejector. The stop valve is opened, and the fast-flowing water driven by the suction pumping of the circulation pump 3 generates a strong negative pressure suction force when passing through the Venturi ejector, The cement dry material powder is sucked up, and the water carries the cement dry material powder into the secondary liquid inlet pipe, and then sprays out from the nozzle at a high speed to form a cement slurry jet. The cement slurry jet hits the inner wall of the secondary tank body, rebounds, splashes around and falls back to the bottom of the secondary tank body, starts the secondary frequency conversion motor, drives the built-in paddles at the bottom of the secondary tank to rotate, further stirs the cement slurry at the bottom of the secondary tank body, accelerates the preparation of the required cement slurry, and prevents the solid phase precipitation in the cement slurry. The stop valve set at the secondary liquid outlet is opened, and the circulation pump is started to suck and pump the cement slurry in the secondary tank body out of the secondary liquid outlet, and flows along the circulation pump. The pipeline flows through the circulation pump 1 and the three-way reversing valve and then flows into the return liquid port, so that the cement slurry flows into the first-stage tank body, starts the first-stage variable frequency motor, drives the built-in paddle at the bottom of the first-stage tank, stirs the cement slurry residing in the first-stage tank body, accelerates the preparation of the required cement slurry, and prevents the solid phase precipitation in the cement slurry. The cement slurry residing in the first-stage tank body is pumped by the circulation pump 3, and flows through the first-stage liquid outlet again, along the circulation pipeline to the stop valve and the Venturi ejector. Under the action of the strong negative pressure suction force, the prepared cement slurry is again entrained with the cement dry material powder transported by the spiral blades, and flows into the first-stage tank body together along the circulation pipeline. The secondary liquid inlet pipe then sprays outward at high speed from the nozzle to form a cement slurry jet. The cement slurry jet hits the inner wall of the secondary tank body, rebounds, splashes around and falls back to the bottom of the secondary tank body. The rotating paddles built into the bottom of the secondary tank further stir the cement slurry at the bottom of the secondary tank body, accelerate the preparation of the required cement slurry, and prevent the solid phase precipitation in the cement slurry. The circulation pump suction pumps the cement slurry in the secondary tank body to flow out from the secondary liquid outlet, flows along the circulation pipeline through the circulation pump, the three-way reversing valve, and then flows into the return liquid port. The cement slurry flows into the primary tank body, and the cycle is repeated until the required cement slurry is quickly prepared.

[0028] Then, according to the ratio and mass of water glass required in the preparation of CS slurry, the required sodium silicate and water are added to the three-stage mixing tank respectively, and stirred until the sodium silicate is fully dissolved to form the required water glass; the stop valve at the bottom side liquid outlet of the three-stage mixing tank is opened, and the circulation pump 2 is started to suck and pump the water glass residing in the three-stage mixing tank, and flow into the liquid inlet pipe 1 along the circulation pipeline; at the same time, the passage of the three-way reversing valve is adjusted so that the prepared cement slurry sucked and pumped from the secondary tank body by the circulation pump 1 flows through the three-way reversing valve along the circulation pipeline and flows into the liquid inlet pipe 2; at this time, the water glass and cement slurry will flow forward rapidly in a spiral shape along the spiral flow channel 1 and the spiral flow channel 2 in the primary mixing chamber respectively, and when the two fluids flow through the primary mixing chamber and enter the secondary mixing chamber, the two fluids are entangled with each other in a spiral shape for strong mixing, and then the mixed liquid of the two fluids flows into the three-stage mixing chamber with a small inner diameter, and is strongly mixed again, and finally sprayed outward.

[0029] Compared with the prior art, the advantages of the present invention are:

[0030] It can solve the problem that the preparation process of the slurry required in the current shield synchronous double-liquid grouting construction process is cumbersome, slow (low efficiency), and time-consuming, which is difficult to meet the needs of shield rapid excavation construction, and the prepared slurry is not sufficiently stirred and mixed, resulting in the problem that the slurry performance does not meet the standards. Utilizing the present invention, the rapid preparation of the slurry required in the shield tunnel synchronous double-liquid grouting construction process can be achieved, and the required slurry can be continuously and high-quality provided for the shield rapid excavation construction, thereby effectively assisting the efficiency and safety of shield tunnel construction, and has many significant advantages such as simple structure, reliable performance, safe and convenient operation, and low comprehensive cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] FIG1 is a schematic diagram of the overall three-dimensional model of the present invention; wherein a is a schematic diagram of the overall three-dimensional model of the present invention when an air compressor is used to provide compressed air to achieve rapid preparation of cement slurry; b is a schematic diagram of the overall three-dimensional model of the present invention when a circulating pump is used to pump and deliver cement slurry;

[0032] Figure 2 It is a schematic diagram of a three-dimensional model of a primary stirring tank of the present invention;

[0033] Figure 3 It is a schematic diagram of a three-dimensional model of a dry material powder storage and transportation tank of the present invention;

[0034] Figure 4 It is a schematic diagram of a three-dimensional model of a two-stage stirring tank of the present invention;

[0035] Figure 5 It is a schematic diagram of a three-dimensional model of the spiral jet two-liquid mixer of the present invention.

[0036] Reference numerals

[0037] 11. Air compressor; 12. Stop valve; 13. Venturi injector; 14. Circulation pump I; 15. Three-way reversing valve; 16. Circulation pump II; 17. Circulation pump III

[0038] 2. Primary mixing tank; 21. Primary cover plate; 211. Primary handle; 212. Primary air / liquid inlet; 213. Return liquid port; 214. Exhaust valve; 22. Primary tank body; 23. Primary paddle inside the tank bottom; 24. Primary variable-frequency motor; 25. Primary liquid outlet; 26. Primary adaptive support leg

[0039] 3. Dry material powder storage and transportation tank; 31. Aggregate cone; 32. Tank body; 33. Tank bottom; 34. Feeding chamber; 341. Rotating shaft wing plate; 342. Telescopic support leg; 35. Screw blade; 36. Adaptive support leg

[0040] 4. Secondary mixing tank; 41. Secondary cover plate; 411. Secondary handle; 42. Secondary tank body; 43. Secondary liquid inlet pipe; 44. Nozzle; 45. Secondary paddle inside the tank bottom; 46. Secondary variable-frequency motor; 47. Secondary liquid outlet; 48. Secondary adaptive support leg

[0041] 5. Tertiary mixing tank

[0042] 6. Screw jet type dual-liquid mixer; 61. Liquid inlet pipe I; 62. Liquid inlet pipe II; 63. Primary mixing chamber; 631. Spiral flow channel I; 632. Spiral flow channel II; 64. Secondary mixing chamber; 65. Tertiary mixing chamber Specific embodiments

[0043] The specific embodiments of the present invention will be described below in conjunction with the embodiments

[0044] It should be noted that the structures, ratios, sizes, etc. shown in this specification are only used to cooperate with the content disclosed in the specification for those who are familiar with this technology to understand and read, and are not used to limit the implementable conditions of the present invention. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present invention

[0045] At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of narration and are not used to limit the implementable scope of the present invention. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the implementable scope of the present invention

[0046] Example 1

[0047] The present invention relates to a rapid slurry preparation system for shield synchronous double-fluid grouting construction, comprising: an air compressor 11, a stop valve 12, a Venturi injector 13, a first circulation pump 14, a three-way reversing valve 15, a second circulation pump 16, a third circulation pump 17, a primary mixing tank 2, a dry material powder storage tank 3, a secondary mixing tank 4, a tertiary mixing tank 5, a spiral jet double-fluid mixer 6 and a circulation pipeline. The circulation pipeline mentioned here is a closed pipeline that connects all components of the present invention and can be made of high-pressure rubber hoses, steel wire-reinforced pressure-resistant plastic pipes, stainless steel pipes, etc. The circulation and flow of fluids such as compressed air, water, cement slurry, and water glass involved in the present invention are all carried out in the circulation pipeline.

[0048] Among them, the primary mixing tank 2 is the primary equipment for rapidly preparing the required cement slurry, mainly including: a primary cover plate 21, a primary tank body 22, an impeller built into the bottom of the primary tank 23, a primary variable-frequency motor 24, a primary liquid outlet 25 and a primary adaptive support leg 26. At both ends of the upper surface of the primary cover plate 21, there are respectively a pair of primary handles 211 that facilitate personnel to lift and carry the primary cover plate 21, a primary air (liquid) inlet 212 for injecting compressed air or water into the primary tank body 22, a return liquid port 213 for the return flow of cement slurry to form a closed loop, and an exhaust valve 214 for releasing the compressed air staying in the primary tank body 22. The primary cover plate 21 and the primary tank body 22 can be fixedly connected by a flange or other suitable means, and at least one sealing gasket should also be provided between them to ensure that the compressed air, water, slurry, etc. injected into the primary tank body 22 will not leak. The impeller built into the bottom of the primary tank 23 is arranged at the bottom inside the primary tank body 22, and the primary variable-frequency motor 24 is arranged at the bottom outside the primary tank body 22. The impeller built into the bottom of the primary tank 23 can be driven by the primary variable-frequency motor 24 to rotate, and the range covered by the rotation of the impeller built into the bottom of the primary tank 23 should be adapted to the specifications of the bottom inside the primary tank body 22, so that when the impeller built into the bottom of the primary tank 23 rotates, it can stir the slurry stored in the primary tank body 22 as evenly as possible, thereby effectively accelerating the pulp-making process and preventing the solid phase in the slurry from precipitating. At the bottom of the primary tank body 22, there is also a primary liquid outlet 25 as a channel for discharging the slurry stored inside the primary tank body 22, and a stop valve that can be automatically controlled or manually controlled is also provided at the primary liquid outlet 25, and the opening and closing of the primary liquid outlet 25 can be automatically or manually realized according to actual needs. In addition, the primary adaptive support leg 26 is composed of at least 3 equally spaced ones, fixedly connected to the bottom of the primary tank body 22, and supports the primary mixing tank 2 at a certain height above the ground. The dynamic adaptive telescopic adjustment of the primary adaptive support leg 26 can be automatically realized by an internal motor or a servo hydraulic system according to the actual working conditions during pulp making to ensure the stability of the primary mixing tank 2.

[0049] The dry material powder storage and transportation tank 3 is used to add dry materials such as cement powder for quickly preparing cement slurry. It is mainly composed of an aggregate cone 31, a tank body 32, a tank bottom 33, a feeding chamber 34, a rotating shaft wing plate 341, a telescopic support leg 342, a spiral blade 35, and an adaptive support leg 36. Among them, the aggregate cone 31 is an inverted conical structure with a larger upper part and a smaller lower part, so that when dry material powders such as cement are poured downward from above the aggregate cone 31, they are not easily scattered. The interiors of the aggregate cone 31, the tank body 32, and the tank bottom 33 are connected. The feeding chamber 34 intersects obliquely with the tank bottom 33 and is internally connected. The connection between the feeding chamber 34 and the tank bottom 33 is a sealed flexible connection, that is, the inclined angle between the feeding chamber 34 and the tank bottom 33 can be adjusted without affecting the stability of the aggregate cone 31, the tank body 32, and the tank bottom 33. The spiral blade 35 is coaxially arranged inside the feeding chamber 34. The spiral blade 35 can be driven to rotate by a motor or other suitable means. One end of the spiral blade 35 extends into the bottom of the tank bottom 33, and the other end of the spiral blade 35 approaches the Venturi injector 13. The rotating shaft wing plate 341 is arranged below the outer wall of the feeding chamber 34. The telescopic support leg 342 is rotatably connected to the rotating shaft wing plate 341, and the length of the telescopic support leg 342 can be automatically or manually adjusted according to actual needs, so as to achieve the purpose of adjusting the inclination angle of the feeding chamber 34. When dry material powders such as cement are poured downward from above the aggregate cone 31, they pass through the tank body 32 to the tank bottom 33, and then the rotating spiral blade 35 conveys the dry material powder obliquely upward through the feeding chamber 34 to the Venturi injector 13.

[0050] The secondary stirring tank 4 is a secondary device for rapidly preparing cement slurry, mainly composed of a secondary cover plate 41, a secondary tank body 42, a secondary liquid inlet pipe 43, a nozzle 44, an internal paddle at the bottom of the secondary tank 45, a secondary variable-frequency motor 46, a secondary liquid outlet 47, and a secondary self-adaptive support leg 48, etc. Among them, at both ends of the upper surface of the secondary cover plate 41, a pair of secondary handles 411 are respectively provided to facilitate personnel to lift and carry the secondary cover plate 41. The secondary cover plate 41 and the secondary tank body 42 can be fixedly connected by a flange or other suitable means, and at least one sealing gasket should also be provided between them to ensure that compressed air, water, slurry, etc. flowing into the secondary tank body 42 will not leak. The horizontal secondary liquid inlet pipe 43 is arranged on the side of the secondary tank body 42 slightly above the middle. The longer end of the secondary liquid inlet pipe 43 extends into the secondary tank body 42. The nozzle 44 is threadedly connected to the longer end of the secondary liquid inlet pipe 43. After the connection, the outlet end face of the nozzle 44 is 10 - 80 cm away from the inner wall surface of the secondary tank body 42. The shorter end of the secondary liquid inlet pipe 43 is exposed outside the secondary tank body 42 and is connected to the circulation pipeline. The nozzle 44 can select nozzle types with different internal flow channel structures. Different nozzle types result in different jet types ejected from their outlets; the selectable nozzle types include but are not limited to: ① cylindrical nozzles, conical nozzles, cone-straight nozzles, streamline nozzles, etc. that generate linear continuous jets; ② rotary jet nozzles that generate rotary jets; ③ pulsed jet nozzles that generate pulsed jets; ④ cavitation jet nozzles that generate cavitation jets; ⑤ fan-shaped nozzles that generate fan-shaped jets. The internal paddle at the bottom of the secondary tank 45 is arranged at the bottom inside the secondary tank body 42, and the secondary variable-frequency motor 46 is arranged at the bottom outside the secondary tank body 42. The internal paddle at the bottom of the secondary tank 45 can be driven by the secondary variable-frequency motor 46 to rotate. The coverage range when the internal paddle at the bottom of the secondary tank 45 rotates should be adapted to the specifications of the bottom inside the secondary tank body 42, so that when the internal paddle at the bottom of the secondary tank 45 rotates, it can stir the slurry stored in the secondary tank body 42 as evenly as possible, thus effectively accelerating the pulping process and preventing solid-phase precipitation in the slurry. A secondary liquid outlet 47 for discharging the slurry stored inside the secondary tank body 42 is also provided at the bottom of the secondary tank body 42. A stop valve that can be automatically controlled or manually controlled is also provided at the secondary liquid outlet 47, and the opening and closing of the secondary liquid outlet 47 can be realized according to actual needs. In addition, the secondary self-adaptive support leg 48 is composed of at least 3 equally spaced ones, fixedly connected to the bottom of the secondary tank body 42, and supports the secondary stirring tank 4 at a certain height above the ground. The dynamic self-adaptive telescopic adjustment of the secondary self-adaptive support leg 48 can be automatically realized by an internal motor or a servo hydraulic system according to the actual working conditions during pulping to ensure the stability of the secondary stirring tank 4.

[0051] The three-stage mixing tank 5 is used to prepare sodium silicate required for double-fluid synchronous grouting. According to the pre-designed ratio, the required sodium silicate and water are respectively added into the three-stage mixing tank 5. In the three-stage mixing tank 5, a handheld or fixed mixer can be used to stir them until the sodium silicate is fully dissolved to form sodium silicate solution. A liquid outlet is provided on the side of the bottom of the three-stage mixing tank 5, and a stop valve that can be automatically controlled or manually controlled is provided at the liquid outlet, and the opening and closing of the liquid outlet can be realized according to actual needs.

[0052] The spiral jet type double-fluid mixer 6 is used for the full mixing and outward jetting of cement slurry and sodium silicate solution, and is mainly composed of a first inlet pipe 61, a second inlet pipe 62, a first-stage mixing chamber 63, a first spiral flow channel 631, a second spiral flow channel 632, a second-stage mixing chamber 64, a third-stage mixing chamber 65, etc. Among them, the sodium silicate solution prepared in the three-stage mixing tank 5 is sucked and pumped to the first inlet pipe 61 by the second circulating pump 16, and then flows into the first spiral flow channel 631. The cement slurry prepared in the second-stage mixing tank 4 is sucked and pumped by the first circulating pump 14 and flows along the circulating pipeline to the three-way reversing valve 15, and then flows along the circulating pipeline into the second inlet pipe 62, and then flows into the second spiral flow channel 632. At this point, the sodium silicate solution and the cement slurry respectively flow rapidly in a spiral shape along the first spiral flow channel 631 and the second spiral flow channel 632 in the first-stage mixing chamber 63. When the two fluid streams flow through the first-stage mixing chamber 63, they enter the second-stage mixing chamber 64 with an inverted cone contraction shape, and the two fluid streams are strongly mixed with each other in a spiral shape at a relatively high flow rate. Then, the mixed liquid (cement-sodium silicate double slurry) of the two fluid streams flows into the third-stage mixing chamber 65 with a smaller inner diameter, and is strongly mixed again, and finally jets out at a relatively fast speed.

[0053] After the above rapid slurry preparation process is completed, it is also necessary to perform a replacement and cleaning operation on the rapid slurry preparation device and the circulating pipeline of the present invention to avoid the situation that the slurry remaining in the circulating pipeline and the slurry preparation device hardens and causes pipe blockage or the slurry preparation device is difficult to work normally again.

[0054] Example 2:

[0055] Using the rapid slurry preparation system for shield synchronous double-fluid grouting construction of the present invention, the double slurry refers to the cement-sodium silicate slurry (i.e., C-S slurry) mixed by cement slurry and sodium silicate solution. In addition to cement, sodium silicate and water, according to the actual situation at the shield tunnel construction site, appropriate amounts of accelerating agents, retarding agents and other additives can be added specifically to appropriately modify the C-S slurry to meet the actual needs of double-fluid synchronous grouting at the shield tunnel construction site.

[0056] In the present invention, the preparation of cement slurry and water glass is carried out separately, and then the two are mixed to prepare the required cement-sodium silicate (C-S) slurry. Among them, the present invention is based on the rapid preparation process of cement slurry under the triple composite mode of "jet impact of nozzle 44 + double paddle stirring (inner paddle 23 at the bottom of the first-stage tank and inner paddle 45 at the bottom of the second-stage tank) + reciprocating circulation in a closed pipeline", which can be divided into the following two sets of rapid preparation schemes for cement slurry:

[0057] (1) Scheme 1 (using the compressed air output by the air compressor 11 as the primary power to drive the fluid to reciprocate and circulate):

[0058] First, connect each component of the device of the present invention and the circulation pipeline as shown in Fig. 1(a). The first-stage adaptive support leg 26 and the second-stage adaptive support leg 48 can automatically expand and contract according to the flatness of the site surface to ensure the stability of the first-stage mixing tank 2 and the second-stage mixing tank 4. Close the stop valve provided at the first-stage liquid outlet 25, and inject the water required for preparing the cement slurry in the C-S slurry according to the water-cement ratio and quality pre-designed for the C-S slurry through the first-stage air (liquid) inlet 212, or the return liquid port 213 or the exhaust valve 214 into the first-stage tank body 22. At the same time, according to the position of the Venturi injector 13 installed on site, adjust the elongation of the telescopic support leg 342 to make the feeding chamber 34 rotate around the rotating shaft wing plate 341, so as to adjust the inclination angle of the feeding chamber 34, so that the outlet of the feeding chamber 34 is directly opposite to the secondary inflow end of the Venturi injector 13. The adaptive support leg 36 can automatically expand and contract according to the flatness of the site surface to ensure the stability of the dry material powder storage and transportation tank 3. Pour the dry material powders such as cement required for preparing the cement slurry in the C-S slurry from the aggregate cone 31 downward according to the water-cement ratio pre-designed for the C-S slurry (if it is necessary to add accelerating agents, setting retarders, etc., their powders can also be poured in the required amounts according to the ratio by imitating the cement powder). The dry material powders such as cement reach the bottom 33 of the tank after passing through the tank body 32, start the spiral blade 35, and the continuously rotating spiral blade 35 can continuously convey the dry material powders such as cement staying at the bottom 33 of the tank obliquely upward along the feeding chamber 34 to approach the secondary inflow end of the Venturi injector 13. In addition, start the air compressor 11 to output compressed air outward. The compressed air continuously injects into the first-stage tank body 22 along the circulation pipeline through the first-stage air / liquid inlet 212. Open the stop valve provided at the first-stage liquid outlet 25, and the water in the first-stage tank body 22 flows to the stop valve 12 along the circulation pipeline through the first-stage liquid outlet 25 under the drive of the compressed air.

[0059] Secondly, when the stop valve 12 is opened, water flows into the venturi ejector 13 at a high flow rate driven by compressed air. At this time, a strong negative pressure suction force will be generated at the secondary inflow end of the venturi ejector 13, which can easily suck up cement and other dry powder from the feeding chamber 34 and mix them with water. Then, water entrains cement and other dry powder to form cement slurry (the cement slurry is not mixed and stirred sufficiently at this time), and flows into the secondary liquid inlet pipe 43 at a high speed, and then sprays out from the nozzle 44 at high speed to form a cement slurry jet. The cement slurry jet hits the inner wall surface of the secondary tank body 42, rebounds, splashes around, and falls back to the bottom of the secondary tank body 42. Start the secondary variable frequency motor 46 to drive the built-in paddle 45 at the bottom of the secondary tank to rotate continuously, so that the cement slurry residing in the secondary tank body 42 can be further stirred, which can accelerate the mixing of cement and other dry powder with water and prevent the solid phase precipitation in the cement slurry, thereby effectively accelerating the preparation of the required cement slurry.

[0060] Next, the stop valve at the secondary liquid outlet 47 is opened, and the circulation pump 14 is started to pump the cement slurry in the secondary tank 42 out of the secondary liquid outlet 47, and flows along the circulation pipeline through the circulation pump 14 and the three-way reversing valve 15, and then flows into the return liquid port 213 and into the primary tank 22. The primary variable frequency motor 24 is started to drive the paddle 23 built in the bottom of the primary tank to stir the cement slurry in the primary tank 22 (at this time, the mixing degree of the cement slurry is already good), which can further accelerate the preparation of the required cement slurry and prevent the solid phase precipitation in the cement slurry. The cement slurry in the primary tank 22 is driven by compressed air and flows at a relatively fast flow rate through the primary liquid outlet 25 and along the circulation pipeline to the stop valve 12. After quickly flowing through the venturi ejector 13, the cement slurry that has been prepared again entrains the cement and other dry material powders transported by the spiral blades 35 and flows into the secondary liquid inlet pipe 43 along the circulation pipeline. Then, it is ejected outward at a high speed from the nozzle 44 to form a cement slurry jet. The cement slurry jet impacts the inner wall surface of the secondary tank 42, rebounds, splashes around, and falls back to the bottom of the secondary tank 42. The paddles 45 built into the bottom of the secondary tank that rotate continuously further stir the cement slurry in the secondary tank 42, further accelerate the preparation of the required cement slurry, and prevent the solid phase precipitation in the cement slurry. The cement slurry in the secondary tank 42 is sucked and pumped by the circulation pump 14 to flow out from the secondary liquid outlet 47, flows along the circulation pipeline through the circulation pump 14 and the three-way reversing valve 15, and then flows into the return liquid port 213, and flows into the primary tank 22, ... and so on, until the performance index of the required cement slurry is reached, thereby completing the rapid preparation of the required cement slurry. Slowly open the exhaust valve 214 to gradually release the compressed air in the primary tank 22 and the circulation pipeline into the surrounding atmosphere. At this point, the rapid preparation of the cement slurry required for the shield synchronous double-liquid grouting construction has been completed.

[0061] (2) Solution 2 (using the circulation pump III 17 to suction and pump the fluid in the primary tank 22 as the primary power to drive the reciprocating circulation of the fluid):

[0062] The main difference between Solution 2 and Solution 1 is that the air compressor 11 in Solution 1 is replaced by the circulation pump III 17, so that the fluid staying in the primary tank 22 driven by the compressed air output by the air compressor 11 is changed to be suctioned and pumped by the circulation pump III 17, and then the rapid preparation process of the cement slurry under the triple composite mode of "nozzle 44 jet impact + double paddle stirring (paddle 23 built in the bottom of the primary tank and paddle 45 built in the bottom of the secondary tank) + closed pipeline reciprocating circulation" is realized. For other processes, Solution 2 is similar to Solution 1.

[0063] Then, according to the pre-designed ratio and quality of the sodium silicate required in the C-S slurry, the required sodium silicate and water are respectively added to the tertiary mixing tank 5, and then a hand-held or fixed mixer is used to stir them until the sodium silicate is fully dissolved to form the required sodium silicate. There is a liquid outlet on the side of the bottom of the tertiary mixing tank 5. Open the stop valve provided there, start the circulation pump II 16, suction and pump the sodium silicate staying in the tertiary mixing tank 5, and flow along the circulation pipeline into the inlet pipe I 61. At the same time, adjust the passage of the three-way reversing valve 15 so that the prepared cement slurry suctioned and pumped by the circulation pump I 14 from the secondary tank 42 flows along the circulation pipeline through the three-way reversing valve 15 and then into the inlet pipe II 62. At this time, the sodium silicate and the cement slurry will respectively flow forward rapidly in a spiral shape along the spiral flow path I 631 and the spiral flow path II 632 in the primary mixing chamber 63. When the two fluids flow through the primary mixing chamber 63 and enter the secondary mixing chamber 64 in an inverted cone contraction shape, the two fluids are strongly mixed together in a spiral shape at a higher flow rate. Then, the mixed liquid of the two fluids (i.e., the required prepared cement-sodium silicate double slurry) flows into the smaller-diameter tertiary mixing chamber 65 at a faster speed, and the two are strongly mixed again and finally ejected outward at a faster speed. According to the actual situation of the shield construction site, a special grouting pipeline can be connected to the outlet of the tertiary mixing chamber 65, so that the prepared C-S slurry is injected into the target position along this grouting pipeline; or, the C-S slurry jet ejected at a high speed from the outlet of the tertiary mixing chamber 65 can also be directly injected into the target position. Thus, the rapid preparation of the cement-sodium silicate slurry (C-S slurry) under the quadruple composite mode of "nozzle 44 jet impact + double paddle stirring (paddle 23 built in the bottom of the primary tank and paddle 45 built in the bottom of the secondary tank) + closed pipeline reciprocating circulation + double spiral high-speed swirling and strong mixing (spiral flow path I 631, spiral flow path II 632, secondary mixing chamber 64 and tertiary mixing chamber 65)" can be realized by using the present invention.

[0064] Finally, it is also necessary to perform a slurry replacement and cleaning operation on the entire rapid pulping device of the present invention to avoid the situation where the slurry remaining in the circulation pipeline and the pulping device hardens after coagulation, resulting in pipe blockage or the pulping device being difficult to work properly again. Specifically, after the shield synchronous double-fluid grouting operation is completed, continuously inject clean water into the first-stage tank body 22, so that the clean water rapidly and continuously reciprocates and flows in the device and the circulation pipeline of the present invention for a period of time. After the slurry remaining in the device and the circulation pipeline of the present invention is cleaned up, the slurry replacement and cleaning operation can be completed.

[0065] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge scope of those skilled in the art.

[0066] Many other changes and modifications can be made without departing from the concept and scope of the present invention. It should be understood that the present invention is not limited to specific embodiments, and the scope of the present invention is defined by the appended claims.

Claims

1. A slurry rapid preparation system for shield synchronous double-fluid grouting construction, characterized in that The system includes: a cement slurry preparation device, a three-stage mixing tank (5), a spiral jet double-fluid mixer (6), and a second circulation pump (16); the three-stage mixing tank (5) is connected to the second circulation pump (16) and then connected to the first liquid inlet pipe (61) of the spiral jet double-fluid mixer (6) to convey sodium silicate, and the cement slurry preparation device is connected to the second liquid inlet pipe (62) of the spiral jet double-fluid mixer (6) to convey cement slurry; the spiral jet double-fluid mixer (6) is used to fully mix the cement slurry and sodium silicate and spray it outwards. Among them, the cement slurry preparation device is driven by compressed air or pumped by a circulation pump.

2. The slurry rapid preparation system for shield synchronous double-fluid grouting construction according to claim 1, wherein, The cement slurry preparation device driven by compressed air includes: a first-stage mixing tank (2), a dry powder storage and transportation tank (3), a second-stage mixing tank (4), an air compressor (11), a stop valve (12), a Venturi injector (13), a first circulation pump (14), and a three-way reversing valve (15). The air compressor (11) is connected to the first-stage mixing tank (2), the main inlet end of the Venturi injector (13) is installed at the outlet end of the stop valve (12), the outlet end of the first-stage mixing tank (2) is connected to the stop valve (12) and the Venturi injector (13) and then connected to the inlet end of the second-stage mixing tank (4), the dry powder storage and transportation tank (3) is connected to the secondary inlet end of the Venturi injector (13), the outlet end of the second-stage mixing tank (4) is sequentially connected to the first circulation pump (14), the three-way reversing valve (15) and then connected to the liquid return port (213) of the first-stage mixing tank (2), and the three-way reversing valve (15) is connected to the second liquid inlet pipe (62) of the spiral jet double-fluid mixer (6).

3. The slurry rapid preparation system for shield synchronous double-fluid grouting construction according to claim 1, characterized in that, The cement slurry preparation device pumped by a circulation pump includes: a first-stage mixing tank (2), a dry powder storage and transportation tank (3), a second-stage mixing tank (4), a stop valve (12), a Venturi injector (13), a first circulation pump (14), a three-way reversing valve (15), and a third circulation pump (17). The main inlet end of the Venturi injector (13) is installed at the outlet end of the stop valve (12), the outlet end of the first-stage mixing tank (2) is connected to the third circulation pump (17), the stop valve (12) and the Venturi injector (13) and then connected to the inlet end of the second-stage mixing tank (4), the dry powder storage and transportation tank (3) is connected to the secondary inlet end of the Venturi injector (13), the outlet end of the second-stage mixing tank (4) is sequentially connected to the first circulation pump (14), the three-way reversing valve (15) and then connected to the liquid return port (213) of the first-stage mixing tank (2), and the three-way reversing valve (15) is connected to the second liquid inlet pipe (62) of the spiral jet double-fluid mixer (6).

4. A rapid slurry preparation system for shield synchronous double-fluid grouting construction according to claim 2 or 3, characterized in that, The first-stage mixing tank (2) includes: a first-stage cover plate (21), a first-stage tank body (22), a first-stage bottom built-in paddle (23), a first-stage variable-frequency motor (24), and a first-stage liquid outlet (25). On the first-level cover plate (21), there are provided a first-level handle (211), a first-level air / liquid inlet (212) for injecting compressed air or water into the first-level tank body 22, a liquid return port (213) for the return of cement slurry to form a closed loop, and an exhaust valve (214) for releasing the compressed air remaining in the first-level tank body (22); The first-level cover plate (21) is hermetically connected to the first-level tank body (22). The first-level bottom-mounted impeller (23) is arranged at the bottom inside the first-level tank body (22). The first-level variable-frequency motor (24) is arranged at the bottom outside the first-level tank body (22). The first-level bottom-mounted impeller (23) responds to the first-level variable-frequency motor (24). The first-level liquid outlet (25) is arranged at the bottom of the first-level tank body (22). A stop valve is also provided at the first-level liquid outlet (25) to enable the opening / closing of the first-level liquid outlet (25) according to actual needs.

5. A rapid slurry preparation system for shield synchronous double-fluid grouting construction according to claim 2 or 3, characterized in that, The dry powder storage and transportation tank (3) is used for adding the powder dry material for quickly preparing cement slurry. The dry powder storage and transportation tank (3) includes: an aggregate cone (31), a tank body (32), a tank bottom (33), a feeding chamber (34), a rotating shaft wing plate (341), a telescopic support leg (342), and a spiral blade (35); Among them, the aggregate cone (31) is of an inverted conical structure. The interiors of the aggregate cone (31), the tank body (32), and the tank bottom (33) are connected. The feeding chamber (34) intersects obliquely with the tank bottom (33) and is internally connected. The feeding chamber (34) is flexibly connected and sealed with the tank bottom (33). The spiral blade (35) is coaxially arranged inside the feeding chamber (34). One end of the spiral blade (35) extends into the bottom of the tank bottom (33), and the other end abuts against the secondary inflow end of the Venturi injector (13). The rotating shaft wing plate (341) is arranged below the outer wall of the feeding chamber (34). The telescopic support leg (342) is hinged to the rotating shaft wing plate (341). When the dry powder is poured downward from above the aggregate cone (31), it passes through the tank body (32) to the tank bottom (33), and then the rotating spiral blade (35) conveys the dry powder obliquely upward through the feeding chamber (34) to the secondary inflow end of the Venturi injector (13).

6. A rapid slurry preparation system for shield synchronous double-fluid grouting construction according to claim 2 or 3, characterized in that, The second-level stirring tank (4) includes: a second-level cover plate (41), a second-level tank body (42), a second-level liquid inlet pipe (43), a nozzle (44), a second-level bottom-mounted impeller (45), a second-level variable-frequency motor (46), and a second-level liquid outlet (47); A secondary handle (411) is installed on the secondary cover plate (41). The secondary cover plate (41) is hermetically connected to the secondary tank body (42). The secondary liquid inlet pipe (43) is horizontally installed on the side of the secondary tank body (42), and a part of the secondary liquid inlet pipe (43) extends into the secondary tank body (42). The nozzle (44) is connected to one end of the secondary liquid inlet pipe (43) that extends into the secondary tank body (42). The other end of the secondary liquid inlet pipe (43) is communicated with the circulation pipeline. The paddle (45) built in the bottom of the secondary tank is arranged at the bottom inside the secondary tank body (42) and is driven to rotate by a secondary variable-frequency motor (46). A secondary liquid outlet (47) for discharging the slurry stored inside the secondary tank body (42) is also provided at the bottom of the secondary tank body (42). A stop valve is also provided at the secondary liquid outlet (47), and the opening / closing of the secondary liquid outlet (47) can be realized according to actual needs.

7. A rapid slurry preparation system for shield synchronous double-fluid grouting construction according to claim 2 or 3, characterized in that, The tertiary mixing tank (5) is used to prepare sodium silicate required for double-fluid synchronous grouting. According to a preset ratio, the required sodium silicate and water are respectively added into the tertiary mixing tank (5). In the tertiary mixing tank (5), a hand-held or fixed mixer is used to stir until the sodium silicate is fully dissolved to form sodium silicate solution. An outlet is provided on the side of the bottom of the tertiary mixing tank (5), and a stop valve is provided at the outlet, and the opening / closing of the outlet can be realized according to actual needs.

8. A rapid slurry preparation system for shield synchronous double-fluid grouting construction according to claim 2 or 3, characterized in that, The spiral jet type double-fluid mixer (6) includes: a primary mixing chamber (63), a spiral flow channel one (631), a spiral flow channel two (632), a secondary mixing chamber (64) and a tertiary mixing chamber (65). The sodium silicate solution prepared in the tertiary mixing tank (5) is pumped to the liquid inlet pipe one (61) by the circulation pump two (16), and then flows into the spiral flow channel one (631). The cement slurry prepared in the secondary mixing tank (4) is pumped along the circulation pipeline to the three-way reversing valve (15) by the circulation pump one (14), and then flows into the liquid inlet pipe two (62) along the circulation pipeline and then into the spiral flow channel two (632). The sodium silicate solution and the cement slurry respectively flow rapidly in a spiral shape along the spiral flow channel one (631) and the spiral flow channel two (632) in the primary mixing chamber (63). When the two fluids flow through the primary mixing chamber (63), they enter the secondary mixing chamber (64) with an inverted cone contraction shape, and the two fluids are strongly mixed with each other in a spiral shape. Then the mixed liquid of the two fluids flows into the tertiary mixing chamber (65) with a small inner diameter and is strongly mixed again to form the required cement-sodium silicate (C-S) slurry, which is finally sprayed outwards.

9. A rapid slurry preparation system for shield synchronous double-fluid grouting construction according to claim 2, characterized in that, In the first working process of the system, compressed air output by the air compressor (11) is used as the primary power to drive the fluid to reciprocate and circulate, specifically including: Based on the preset water-cement ratio and mass of the cement slurry, water required for preparing the cement slurry is added to the primary tank (22), the air compressor (11) is started to output compressed air to the outside, which flows into the primary air / liquid inlet (212) through the circulation pipeline and then flows into the primary tank (22). The stop valve arranged at the primary liquid outlet (25) is opened, and the water in the primary tank (22) flows through the primary liquid outlet (25) and along the circulation pipeline to the stop valve (12) under the drive of the compressed air. The spiral blade (35) is started to transport the cement dry material powder for preparing the required cement slurry to the secondary inlet end of the venturi ejector (13). The stop valve (12) is opened, and the water flowing rapidly under the drive of the compressed air generates a relatively large amount of water when passing through the venturi ejector (13). The strong negative pressure suction force sucks up the cement dry material powder, and the water entrains the cement dry material powder and flows into the secondary liquid inlet pipe (43), and then sprays outward from the nozzle (44) at a high speed to form a cement slurry jet. The cement slurry jet hits the inner wall surface of the secondary tank body (42), rebounds, splashes around, and falls back to the bottom of the secondary tank body (42). The secondary variable frequency motor (46) is started to drive the built-in paddle (45) at the bottom of the secondary tank to rotate, further stirring the cement slurry residing at the bottom of the secondary tank body (42), accelerating the preparation of the required cement slurry and preventing the solid phase precipitation in the cement slurry. The stop valve arranged at the secondary liquid outlet (47) is opened, and the circulation pump 1 (14) is started to suck and pump the cement slurry residing in the secondary tank body (42) from the secondary liquid outlet (47). 7) flows out, flows along the circulation pipeline through the circulation pump 1 (14), the three-way reversing valve (15), and then flows into the return liquid port (213), so that the cement slurry flows into the first tank body (22), starts the first frequency conversion motor (24), drives the built-in paddle (23) at the bottom of the first tank, stirs the cement slurry in the first tank body (22), accelerates the preparation of the required cement slurry, and prevents the solid phase precipitation in the cement slurry. Driven by the compressed air, the cement slurry in the first tank body (22) flows again through the first liquid outlet (25), along the circulation pipeline to the stop valve (12), and the Venturi ejector (13). Under the action of the strong negative pressure suction force, the prepared cement slurry again entrains the cement dry material powder transported by the spiral blade (35). Finally, the cement slurry flows into the secondary liquid inlet pipe (43) along the circulation pipeline, and then is ejected outward at a high speed from the nozzle (44) to form a cement slurry jet. The cement slurry jet hits the inner wall surface of the secondary tank body (42), rebounds, splashes around, and falls back to the bottom of the secondary tank body (42). The rotating paddles (45) built into the bottom of the secondary tank further stir the cement slurry at the bottom of the secondary tank body (42), accelerate the preparation of the required cement slurry, and prevent the solid phase precipitation in the cement slurry. The circulation pump 1 (14) sucks and pumps the cement slurry in the secondary tank body (42) to flow out from the secondary liquid outlet (47), flows through the circulation pump 1 (14) and the three-way reversing valve (15) along the circulation pipeline, and then flows into the return liquid port (213). The cement slurry flows into the primary tank body (22).Repeat the above process in a cycle until the rapid preparation of the required cement slurry is completed; Then, according to the ratio and quality of sodium silicate required in preparing the C-S slurry, add the required sodium silicate and water into the three-stage stirring tank (5) respectively, and stir until the sodium silicate is fully dissolved to form the required sodium silicate; open the stop valve at the bottom side outlet of the three-stage stirring tank (5), start the second circulation pump (16), suck and pump the sodium silicate staying in the three-stage stirring tank (5), and flow it into the first inlet pipe (61) along the circulation pipeline; at the same time, adjust the passage of the three-way reversing valve (15) so that the prepared cement slurry sucked and pumped by the first circulation pump (14) from the second tank body (42) flows into the second inlet pipe (62) along the circulation pipeline after flowing through the three-way reversing valve (15); at this time, the sodium silicate and the cement slurry will flow forward rapidly in a spiral shape in the first mixing chamber (63) along the first spiral flow channel (631) and the second spiral flow channel (632) respectively. When the two fluids flow through the first mixing chamber (63) and enter the second mixing chamber (64), the two fluids are intertwined in a spiral shape for strong mixing, and then the mixed liquid of the two fluids flows into the third mixing chamber (65) with a small inner diameter for strong mixing again, and finally sprays outwards.

10. A rapid slurry preparation system for shield synchronous double-fluid grouting construction according to claim 3, characterized in that The second working process of the system is to use the third circulation pump (17) to suck and pump the fluid in the first tank body (22) as the primary power for driving the fluid to reciprocate and circulate, specifically including: Based on the preset water-cement ratio and quality of the cement slurry, water required for preparing the cement slurry is added to the primary tank (22) through the primary air / liquid inlet (212), the circulation pump three (17) is started to pump the water stored in the primary tank (22), the stop valve arranged at the primary liquid outlet (25) is opened, and the water in the primary tank (22) flows through the primary liquid outlet (25) and along the circulation pipeline to the stop valve (12) under the suction and pumping of the circulation pump three (17), the spiral blade (35) is started to transport the cement dry material powder for preparing the required cement slurry to the secondary inlet end of the venturi ejector (13), the stop valve (12) is opened, and the water flowing rapidly under the suction and pumping drive of the circulation pump three (17) flows through the venturi ejector (13) and flows into the stop valve (12). 3) generates a strong negative pressure suction force to suck up the cement dry material powder, and the water carries the cement dry material powder into the secondary liquid inlet pipe (43), and then sprays outward from the nozzle (44) at a high speed to form a cement slurry jet. The cement slurry jet hits the inner wall surface of the secondary tank body (42), rebounds, splashes around and falls back to the bottom of the secondary tank body (42), and the secondary variable frequency motor (46) is started to drive the built-in blade (45) at the bottom of the secondary tank to rotate, further stirring the cement slurry residing at the bottom of the secondary tank body (42), accelerating the preparation of the required cement slurry and preventing the solid phase precipitation in the cement slurry. The stop valve arranged at the secondary liquid outlet (47) is opened, and the circulation pump 1 (14) is started to suck and pump the cement slurry residing in the secondary tank body (42). The cement slurry flows out from the secondary liquid outlet (47), flows along the circulation pipeline through the circulation pump 1 (14), the three-way reversing valve (15), and then flows into the return liquid outlet (213), so that the cement slurry flows into the primary tank body (22), and the primary variable frequency motor (24) is started to drive the built-in paddle (23) at the bottom of the primary tank to stir the cement slurry in the primary tank body (22), accelerate the preparation of the required cement slurry, and prevent the solid phase precipitation in the cement slurry. The cement slurry in the primary tank body (22) is pumped by the circulation pump 3 (17) and flows again through the primary liquid outlet (25), along the circulation pipeline to the stop valve (12), and the Venturi ejector (13). Under the action of the strong negative pressure suction force, the prepared cement slurry is again entrained by the spiral blades. The cement dry material powder transported by the plate (35) flows into the secondary liquid inlet pipe (43) along the circulation pipeline, and then is ejected outward at a high speed from the nozzle (44) to form a cement slurry jet. The cement slurry jet hits the inner wall surface of the secondary tank body (42), rebounds, splashes around, and falls back to the bottom of the secondary tank body (42). The rotating paddles (45) built into the bottom of the secondary tank further stir the cement slurry residing at the bottom of the secondary tank body (42), accelerate the preparation of the required cement slurry, and prevent the solid phase precipitation in the cement slurry. The circulation pump 1 (14) sucks and pumps the cement slurry residing in the secondary tank body (42) to flow out from the secondary liquid outlet (47), flows through the circulation pump 1 (14) and the three-way reversing valve (15) along the circulation pipeline, and then flows into the return liquid port (213).The cement slurry flows into the first-stage tank body (22), and this reciprocating cycle continues until the rapid preparation of the required cement slurry is completed; Then, according to the ratio and quality of sodium silicate required in preparing the C-S slurry, add the required sodium silicate and water into the three-stage stirring tank (5) respectively, and stir until the sodium silicate is fully dissolved to form the required sodium silicate; open the stop valve at the bottom side outlet of the three-stage stirring tank (5), start the second circulation pump (16), suck and pump the sodium silicate staying in the three-stage stirring tank (5), and flow it into the first inlet pipe (61) along the circulation pipeline; at the same time, adjust the passage of the three-way reversing valve (15) so that the prepared cement slurry sucked and pumped by the first circulation pump (14) from the second tank body (42) flows into the second inlet pipe (62) along the circulation pipeline after flowing through the three-way reversing valve (15); at this time, the sodium silicate and the cement slurry will flow forward rapidly in a spiral shape in the first mixing chamber (63) along the first spiral flow channel (631) and the second spiral flow channel (632) respectively. When the two fluids flow through the first mixing chamber (63) and enter the second mixing chamber (64), the two fluids are intertwined in a spiral shape for strong mixing, and then the mixed liquid of the two fluids flows into the third mixing chamber (65) with a small inner diameter for strong mixing again, and finally sprays outwards.

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