CN114278317A - Slurry preparation-injection integrated method for synchronous double-liquid grouting in shield tunnel - Google Patents
Slurry preparation-injection integrated method for synchronous double-liquid grouting in shield tunnel Download PDFInfo
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- CN114278317A CN114278317A CN202111444673.2A CN202111444673A CN114278317A CN 114278317 A CN114278317 A CN 114278317A CN 202111444673 A CN202111444673 A CN 202111444673A CN 114278317 A CN114278317 A CN 114278317A
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Abstract
The invention discloses a slurry preparation-injection integrated method for synchronous double-liquid grouting in a shield tunnel, which adopts a stirring device and a grouting device which are connected with each other, and comprises the following steps: s1, additionally arranging a trolley on the shield tunneling machine; s2, preparing a solution A; mixing the S3 and S A, B solutions at the tail of the shield to form a mixed solution; s4, monitoring A, B real-time flow of the liquid by a monitoring unit, controlling the mixed liquid to reach a gelling state, and synchronously injecting the mixed liquid into a shield tail gap through a grouting pipeline along with the propulsion of the shield machine; and S5, washing the grouting pipeline through high-pressure water. On one hand, the invention realizes the short-distance transportation of the liquid A, reduces the performance loss, ensures the grouting quality, greatly reduces the construction amount of pipelines, reduces the labor intensity and the construction cost, enhances the cooperativity of pulping and grouting, and effectively improves the construction efficiency; on the other hand, the accurate control and adjustment of the mixing ratio and the injection amount of the liquid A and the liquid B are realized, and the precision of the double-liquid synchronous grouting is improved.
Description
Technical Field
The invention belongs to the technical field of tunnel construction, and particularly relates to a slurry preparation-injection integrated method for synchronous double-liquid grouting in a shield tunnel.
Background
In the shield tunneling process, the outer diameter of a cutter head of a shield is larger than the outer diameter of a lining segment, and a shield shell has certain thickness, in addition, the phenomena of overexcavation and the like exist in the tunneling process, after a shield tail is separated from the segment, an annular gap can appear between the segment and a stratum, and the shield tail gap is usually filled by adopting a synchronous grouting technology in the actual shield tunnel engineering. The grouting slurry commonly used in shield tunnel construction at present can be roughly divided into two types, namely a single-fluid grouting material and a double-fluid grouting material. The double-fluid slurry is prepared by pumping A, B fluid from two pipelines, mixing in the slurry injection hole of the shield tail and injecting into the gap of the shield tail. The liquid A is cement-based material, and the liquid B is usually water glass material as a hardening agent. In the actual shield tunnel engineering, the mixing proportion of the double-fluid slurry is properly adjusted, so that the stone body has higher early strength, the shield tail is effectively filled, and the ground surface settlement is controlled. Therefore, the double-fluid slurry is often applied to the water-rich environment of tunnel shield construction, the synchronous grouting of soft soil layers and the secondary grouting of conventional shield construction.
At present, the liquid B is a water glass material and does not need to be specially stirred, so the stirring of the liquid A is mainly required to be implemented on a construction site, wherein the traditional stirring and transporting construction technology of the liquid A mainly comprises the following steps: mixing the solution A in a ground mixing station for production, and transporting the slurry into a tunnel by a mortar truck for grouting; meanwhile, in the synchronous grouting process, the actual mixing ratio, the actual grouting pressure and the actual flow rate of the A, B liquid are adjusted mainly by controlling the flow rate of the A, B liquid.
However, the above process has the following defects in the actual construction process:
1. the transport distance of the mixed A liquid pipeline is long, the problems of low construction efficiency and high pipeline failure rate exist along with the tunneling of a shield machine, and due to the long-distance transportation of the pipeline, the homogeneity of a cement-based material is easily reduced, the synergy with a grouting process is poor, and the construction quality is influenced;
2. if the open cut section from the initial working well to the ground is not constructed, the mortar vehicle for conveying the liquid A can not enter the tunnel through the existing road, the mixed liquid A needs to be vertically conveyed to enter the tunnel through the upper part and the lower part of the shield initial working well, the construction amount is large, and the cost is high;
3. during grouting, A, B liquid is difficult to adjust through flow rate control, the precision is poor, flow statistics is inaccurate, the mix proportion of A, B liquid cannot be accurately controlled, and therefore the actual mix proportion and the theoretical mix proportion of the liquid A and the liquid B are easy to have large differences, so that synchronous grouting slurry cannot be quickly cemented and fill pores, the situations of floating, damage, deformation, weakening of water-stopping sealing effect and the like of a duct piece are easy to cause, and the service life cycle and the safety of the whole project are greatly adversely affected.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an improved slurry preparation-injection integrated method for synchronous double-liquid grouting in a shield tunnel.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a slurry preparation-injection integrated method for synchronous double-liquid injection in a shield tunnel adopts a stirring device and an injection device which are connected, wherein the stirring device is positioned in the shield tunnel and moves synchronously with a shield machine, and the stirring device comprises a tail trolley synchronously connected with the shield machine; the liquid A stirring unit and the powder supply unit of the liquid A are arranged on the tail trolley; a clear water supply unit; a liquid B supply unit;
the grouting equipment comprises a liquid A supply pipeline, a liquid B supply pipeline, a mixer, a grouting pipeline, a monitoring unit and a control system, wherein the liquid A supply pipeline, the liquid B supply pipeline and the grouting pipeline are respectively communicated with the mixer, the monitoring unit monitors the real-time flow of the liquid A and the liquid B in real time, the control system is used for setting various grouting parameters of the liquid A and the liquid B and automatically controlling and adjusting according to the real-time flow,
the integration method comprises the following steps:
s1, adding a trolley on the shield tunneling machine, designing the equipment sizes of the liquid A stirring unit and the powder supply unit according to the reasonable space layout of the trolley, and respectively installing the liquid A stirring unit and the powder supply unit on the trolley;
s2, firstly, adding clear water and bentonite into a stirring tank for stirring bentonite liquid, so that the bentonite and the clear water are mixed and stirred to prepare the bentonite liquid; secondly, adding a stabilizer, clear water, bentonite liquid and cement powder into a stirring tank for stirring the liquid A, and mixing and stirring to prepare liquid A;
s3, respectively setting grouting pressure, grouting speed and grouting mixing proportion of A, B liquid, and conveying the liquid A and the liquid B prepared in the S2 to mix A, B liquid at the tail of the shield to form mixed liquid;
s4, monitoring A, B real-time flow of the liquid by a monitoring unit, feeding the result back to a control system, automatically adjusting the flow of the liquid A and the flow of the liquid B after the feedback is received by the control system, and controlling the actual mixing ratio of A, B liquid to be basically consistent with the theoretical mixing ratio, wherein the mixed liquid can reach a gelling state and is synchronously injected into a shield tail gap through a grouting pipeline along with the propulsion of the shield tunneling machine;
s5, after grouting with A, B liquid is completed, flushing a grouting pipeline through high-pressure water, observing discharged sewage, and completing cleaning when the sewage is clear.
Preferably, the blending apparatus has a manual mode, a semi-automatic mode, and a fully automatic mode. The manual mode is set in such a way that constructors can conveniently carry out equipment debugging, cleaning and other operations; the semi-automatic mode and the full-automatic mode can be selected and operated by workers according to needs, and the flexibility is high.
Preferably, in S3, the mixing ratio of the solution A to the solution B is 14-16: 1. By the arrangement, the mixed liquid of the liquid A and the liquid B is in a gelled state before reaching the stratum, and the injection property is better.
Preferably, in S3, the a liquid supply line is opened first, and the B liquid supply line is opened again while the grouting pressure of the a liquid is kept stable. So set up, A, B liquid can the homogeneous mixing, and it is stable to guarantee to mix the liquid velocity of flow, improves the slip casting quality.
Preferably, the tail trolley comprises a bearing platform and a frame arranged on the bearing platform, wherein the powder supply unit is arranged at the top of the frame, and the liquid A stirring unit is arranged on the bearing platform. The mixing system is arranged in a narrow tunnel space, the utilization rate of the space is improved, the mixing system can move along with a vehicle, and the construction efficiency is improved.
Specifically, the powder supply unit comprises a bentonite powder tank, a cement powder tank, a dust collecting tank, a stabilizer tank and a plurality of powder conveying components, wherein the bentonite powder tank and the cement powder tank are horizontal storage tanks and can be used for the shield tunneling machine to tunnel the grouting amount required by 11-13 rings; the dust collecting tank is arranged between the bentonite powder tank and the cement powder tank and is communicated to the tops of the inner cavities of the bentonite powder tank and the cement powder tank through pipelines respectively. By the arrangement, the storage quantity is reasonably designed, and the construction requirement is met; meanwhile, the dust collecting effect of the dust collecting tank on the cement powder tank and the bentonite powder tank is improved.
Further, the liquid A stirring unit comprises a first stirring tank, a second stirring tank, a third stirring tank communicated with the first stirring tank and a fourth stirring tank communicated with the second stirring tank, wherein the bentonite powder tank and the cement powder tank are respectively communicated with the first stirring tank and the second stirring tank, the first stirring tank and the second stirring tank are high-speed stirring tanks and are respectively used for high-speed stirring of bentonite liquid and liquid A, and the third stirring tank and the fourth stirring tank are low-speed stirring tanks and are respectively used for premixing operation of the bentonite liquid and the liquid A; the second stirring tank and the fourth stirring tank form a group of liquid A stirring groups, and the liquid A stirring groups are two groups and are respectively arranged on two opposite sides of the bearing platform. By the arrangement, after the bentonite liquid and the slurry A are stirred, the bentonite liquid and the slurry A can be stored and premixed through the low-speed stirring tank, so that the precipitation is avoided, and the homogeneity of the bentonite liquid and the slurry A is conveniently maintained; meanwhile, the two groups of slurry stirring groups A work simultaneously, the slurry making capacity can be further increased, and the running of vehicles is not influenced.
Preferably, the mixer is arranged 2-5 m away from a liquid outlet of the grouting pipeline, and a three-way automatic valve is further arranged between the liquid outlet of the mixer and a liquid inlet of the grouting pipeline. By the arrangement, the grouting distance is short, the grouting efficiency is high, the A, B liquid mixing effect can be ensured, the phenomenon of condensation in the grouting pipeline is reduced, and the working strength of cleaning the pipeline at the later stage is reduced; meanwhile, the three-way automatic valve is convenient for realizing automatic back flushing by high-pressure water.
Preferably, the liquid A supply pipeline, the liquid B supply pipeline, the mixer, the grouting pipeline and the monitoring unit form a grouting group, and the grouting equipment comprises a plurality of grouting groups. By the arrangement, multi-point synchronous grouting is realized, the uniform distribution of slurry in the stratum is ensured, and the soil strength and bearing capacity after grouting are ensured.
In addition, the grouting equipment also comprises a liquid A grouting tank, a liquid B grouting tank, a liquid A grouting pump correspondingly arranged on each liquid A supply pipeline and a liquid B grouting pump correspondingly arranged on each liquid B supply pipeline, wherein each liquid A grouting pump and each liquid B grouting pump can be independently controlled; the monitoring unit is an electromagnetic flowmeter arranged at each liquid A grouting pump and each liquid B grouting pump. The setting like this, be convenient for as required, nimble control slip casting volume, and the monitoring adjustment precision of A, B liquid is high.
Due to the implementation of the technical scheme, compared with the prior art, the invention has the following advantages:
on one hand, the invention realizes the short-distance transportation of the liquid A by additionally arranging a section of shield machine trolley and synchronously moving the pulping equipment of the liquid A along with the shield machine, reduces the performance loss, ensures the grouting quality, greatly reduces the construction amount of pipelines, reduces the labor intensity and the construction cost, promotes the cooperativity of pulping and grouting and effectively improves the construction efficiency; on the other hand, through the monitoring and control of the real-time flow of the liquid A and the liquid B, the accurate control and adjustment of the mixing proportion and the injection amount of the liquid A and the liquid B are realized, and the precision of the double-liquid synchronous grouting is improved.
Drawings
FIG. 1 is a schematic view of a mixing apparatus used in the present invention;
FIG. 2 is a schematic left side view of FIG. 1 (without the first agitator tank);
FIG. 3 is a schematic top view of the powder supply unit of FIG. 1;
FIG. 4 is an enlarged schematic view of the first agitator tank of FIG. 1;
FIG. 5 is an enlarged schematic view of the second agitator tank of FIG. 1;
FIG. 6 is a schematic view of the piping assembly of FIG. 1;
wherein: 1. a tail trolley; 10. a load-bearing platform; 11. a frame;
2. a powder supply unit; 20. a bentonite powder tank; 21. a cement powder tank; j. a support frame; 22. a powder conveying component; 23. a dust collection tank;
3. a liquid A stirring unit; 31. a first agitator tank; 32. a second stirred tank; 33. a third stirred tank; 34. a fourth agitator tank; 35. and an operation chamber.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and that modifications may be made by one skilled in the art without departing from the spirit and scope of the application and it is therefore not intended to be limited to the specific embodiments disclosed below.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
In the slurry preparation-injection integrated method for synchronous double-fluid injection in the shield tunnel of the embodiment, the stirring equipment and the injection equipment are used for stirring the solution A in the shield tunnel, and the stirred solution A and the solution B are synchronously injected into the gap at the tail of the shield along with the propulsion of the shield machine, wherein the solution A in the embodiment adopts slurry, and the solution B adopts water glass.
As shown in fig. 1, the mixing device is located in a shield tunnel and moves synchronously with the shield machine, and the mixing device comprises a tail trolley 1 synchronously connected with the shield machine; a liquid A stirring unit 3 and a powder supply unit 3 of the liquid A which are arranged on the tail trolley 1; and a B liquid supply unit.
Specifically, the tail trolley 1 comprises a bearing platform 10 and a frame 11 installed on the bearing platform 10, wherein the frame 11 is formed by splicing H-shaped steel and steel plates, and an operation area with a square cross section is formed between the frame 11 and the bearing platform 10.
The powder supply unit 2 includes a bentonite powder tank 20, a cement powder tank 21, a stabilizer tank, a powder transport part 22, and a dust tank 23.
Specifically, the bentonite powder tank 20 has a volume of 23m3The cement powder tank 21 adopts a horizontal storage tank with the volume of 80m3The horizontal storage tank can be used for the shield tunneling machine to tunnel 12 rings. The arrangement is reasonable in storage amount, and construction requirements are met.
Meanwhile, when the bentonite powder tank 20 and the cement powder tank 21 need to be supplemented, they are delivered by a horizontal transport vehicle. Is simple and convenient.
The bentonite powder tank 20 and the cement powder tank 21 are distributed at intervals side by side along the length direction of the tail trolley 1 and are installed at the center of the top of the frame 11 through a support frame j, and the bentonite powder tank 20 and the cement powder tank 21 are respectively provided with a discharge hole from the bottom.
Referring to fig. 2 and 3, one bentonite powder tank 20 is provided, and two cement powder tanks 21 are provided and arranged side by side along the width direction of the loading platform 10.
In this example, the dust collection tank 23 is provided between the bentonite powder tank 20 and the cement powder tank 21, and is used for collecting dust generated by feeding cement and bentonite. By the arrangement, the dust overflow during charging is reduced, and the construction environment quality is improved; meanwhile, the collected powder can be separated for use, so that the waste is reduced, and the cost is reduced.
Specifically, two dust tanks 23 are arranged side by side along the width direction of the loading platform 10, and each dust tank 23 is communicated to the tops of the inner cavities of the bentonite powder tank 20 and the cement powder tank 21 through pipelines. By the arrangement, the dust collection effect of the dust collection tank on the cement powder tank and the bentonite powder tank is improved.
Meanwhile, each dust collection tank 23 is thin-walled and 6m in volume.
In this example, there were two stabilizer tanks, where each stabilizer tank had a volume of 0.5m ethanol.
In this example, each powder conveying member 22 is a screw conveyor and is disposed at the discharge port at the bottom of the bentonite powder tank 20 and the cement powder tank 21.
In this example, the liquid a stirring unit 3 includes a first stirring tank 31 for stirring the bentonite liquid, and a second stirring tank 32 communicated with the first stirring tank 31 for stirring the liquid a, wherein the bentonite powder tank 20 is communicated to the first stirring tank 31 through a corresponding powder conveying component 22, the stirred bentonite liquid is conveyed from the first stirring tank 31 to the second stirring tank 32, and the cement powder tank 21 and the stabilizer tank are communicated to the second stirring tank 32 through a corresponding powder conveying component 22.
Specifically, the first agitation tank 31 and the second agitation tank 32 are installed on the bearing platform 10 and are correspondingly located below the bentonite powder tank 20 and the cement powder tank 21. Set up like this, rationally distributed in constrictive tunnel space, improve the utilization ratio in space, realize mixing system equipment and can follow the car and go together, improve the efficiency of construction.
Referring to fig. 4, first agitator tank 31 adopts the high-speed agitator tank that volume is 1.2m and educes, and this embodiment still includes third agitator tank 23 that sets up in first agitator tank 31 below and be linked together with first agitator tank 31, and wherein third agitator tank 23 adopts the low-speed agitator tank that the volume is 3.2m and educe the year for the ready-mixing operation of bentonite liquid. Set up like this, the bentonite liquid stirring is accomplished the back, stores and the premixing through low-speed agitator tank, avoids taking place to deposit, is convenient for keep the homogeneity of bentonite liquid.
Referring to fig. 5, second drum 32 adopts a high speed drum with a volume of 1.2m for cultivation, and the present embodiment further includes a fourth drum 24 disposed below second drum 32 and communicating with second drum 32, wherein fourth drum 24 adopts a low speed drum with a volume of 3.2m for liquid a pre-mixing operation. Set up like this, the back is accomplished in the stirring of A liquid, stores and the premixing through low-speed agitator tank, avoids taking place the sediment, is convenient for keep the homogeneity of A liquid, the performance of A liquid when guaranteeing the slip casting.
Specifically, the second agitation tank 32 and the fourth agitation tank 24 constitute a group of liquid a agitation groups, wherein the two groups of liquid a agitation groups are respectively disposed on two opposite sides of the carrying platform 10. By the arrangement, the pulping capacity is further increased, and the running of the vehicle is not influenced.
In this embodiment, the present embodiment further includes a clean water supply unit for providing the slurry making water for the first stirring tank 31 and the second stirring tank 32, and the clean water supply unit includes a clean water tank, a clean water pump, and a monitoring module for detecting the liquid level of the clean water tank and replenishing water.
Referring to fig. 6, the clean water tank pumps clean water to the bentonite liquid agitator tank and the two liquid a high-speed agitator tanks through clean water pumps.
Specifically, the automatic water supply amount of the clear water supply unit needs to reach 1000L/min.
Meanwhile, the liquid A stirring unit 3 further comprises two operation chambers 35, wherein the two operation chambers 35 are arranged on two opposite sides of the bearing platform 10, the two operation chambers 35 are correspondingly connected with the two liquid A stirring groups one by one, and the main functions of the liquid A stirring unit are to realize the preparation of bentonite liquid, the transfer of the bentonite liquid, the mixing of a stabilizer and water after mixing and stirring, the mixing of cement powder and a mixture and the like through panel operation during the pulping operation, so that the pulping operation is completed.
Specifically, each of the operation chambers 35 has a manual mode, a semi-automatic mode, and a full-automatic mode, and is mainly composed of a power supply box, a mortar operation panel, a pump operation panel, and a liquid a supply panel, and two stabilizer tanks are respectively placed in the two operation chambers 35.
Meanwhile, each of the operation rooms 35 is also communicated with a shield driver operation room. By the arrangement, the liquid A can be conveniently supplied during grouting.
In this example, the liquid B supply unit comprises a liquid B storage tank arranged on the tail trolley 1 and arranged at 30m length and a hose pump for pumping the liquid B.
Of course, the liquid B storage tank can also be arranged on the ground and used for pumping the liquid B to the underground storage tank through a hose pump.
In this example, the grouting equipment includes a liquid A slurry storage tank, a liquid A grouting pump, a liquid A supply pipeline, a liquid B slurry storage tank, a liquid B grouting pump, a liquid B supply pipeline, a mixer, a grouting pipeline, a monitoring unit, and a control system.
For convenience, each of the liquid supply pipeline a, the liquid supply pipeline B, the mixer, the grouting pipeline, and the monitoring unit form a grouting group, and the grouting equipment of the embodiment includes eight grouting groups. By the arrangement, multi-point synchronous grouting is realized, the uniform distribution of slurry in the stratum is ensured, and the soil strength and bearing capacity after grouting are ensured.
Specifically, A liquid pulp storage tank has two, and wherein every A liquid pulp storage tank volume is 25m dry year, and every A liquid pulp storage tank's bottom evenly distributed still has four weighing sensor, when A liquid surplus is not enough in the A liquid pulp storage tank, fourth agitator tank 24 passes through the pipeline and in time supplements A liquid to A liquid pulp storage tank. The residual amount of the liquid A in the pulp storage tank can be accurately known so as to facilitate the pulp supplement in time.
Eight A liquid grouting pumps are respectively connected below the A liquid slurry storage tank through gate valves, flushing ports for cleaning grouting pumps are further arranged at the joints, each A liquid grouting pump is of a hydraulic double-plunger type and can be controlled independently, and the load of each A liquid grouting pump is kept to be more than 50% when the A liquid grouting pump works. The setting is convenient for control the grouting amount flexibly according to the requirement.
Meanwhile, through the test of the applicant, when the load of the liquid A grouting pump is kept above 50%, the flow deviation is +/-5L/min, and the liquid A grouting pump is in a relatively ideal state.
Eight A liquid supply pipelines are correspondingly connected to each A liquid grouting pump.
Liquid B stores up thick liquid jar and has one, wherein this liquid B stores up thick liquid jar volume is 10m, and bottom evenly distributed has four weighing sensor, when liquid B surplus is not enough in the liquid B stores up thick liquid jar, liquid B stores up the jar and in time supplyes liquid B in the liquid B stores up thick liquid jar through the pipeline.
Eight B liquid grouting pumps are connected below the B liquid slurry storage tank through gate valves respectively, wherein each B liquid grouting pump is an electric screw pump and can be controlled independently. The setting is convenient for control the grouting amount flexibly according to the requirement.
Eight B liquid supply pipelines are correspondingly connected to each B liquid grouting pump.
In this example, the mixer is located 3m from the corresponding outlet of the grouting pipe. By the arrangement, the grouting distance is short, and the grouting efficiency is high; simultaneously, guarantee A, B liquid mixing effect, and reduce the phenomenon that condenses in the slip casting pipeline, reduce the working strength that later stage washd the pipeline.
In this example, each grouting pipeline set includes a mixed liquid pipe with specification DN50, a high-pressure water pipe with specification DN25, and a lubricating oil pipe with specification DN10, wherein during synchronous grouting, the mixer is communicated with the mixed liquid pipe, and during cleaning, the mixer is communicated with the high-pressure water pipe.
Specifically, a nozzle of the high-pressure water pipe is provided with a three-way piston, the middle part of the high-pressure water pipe is provided with a traction oil cylinder, the three-way piston is sealed by elastic polyurethane, and a three-way automatic valve is arranged between a liquid outlet of the mixer and a liquid inlet of the grouting pipeline. The device has the functions of double-liquid mixing, outlet non-return, bypass pressure relief, cleaning backflow and the like.
In this example, the monitoring unit is an electromagnetic flowmeter correspondingly arranged at each of the liquid A grouting pump and the liquid B grouting pump, and forms the real-time flow of A, B liquid as feedback. The A, B liquid flow can be monitored in real time, and the precision is high.
In this example, the control system is a PLC control system, wherein sensors for detecting pressure and flow rate, and electronic components such as a valve group controller are respectively disposed on the liquid a supply pipeline, the liquid B supply pipeline, and the grouting pipeline, the PLC control system is designed integrally according to the grouting process requirements, can receive the feedback of each sensor, and can control the liquid a and the liquid B in a linkage manner by compiling an automatic control program, and an operation terminal in the form of a touch screen is disposed in the shield driver operation room. The grouting device is comprehensive in information, convenient for constructors to master the state of the whole grouting process, high in control precision and simple and convenient to operate.
In summary, the slurry preparation-injection integration method of the embodiment includes the following steps:
1. adding a section of tail trolley on the shield tunneling machine, designing the sizes of the bentonite powder tank and the cement powder tank according to the space of the tail trolley, and carrying out reasonable layout and installation;
2. firstly, clear water is pumped into a first stirring tank by a clear water pump, secondly, bentonite is conveyed into the first stirring tank from a bentonite powder tank by a powder conveying component, the first stirring tank is started to be fully stirred and made into bentonite liquid, and the stirred bentonite liquid is conveyed into a third stirring tank to be premixed;
the operation room controls the stabilizer to be input into the second stirring tank, then the clean water pump pumps clean water into the second stirring tank, the second stirring tank is started to be mixed and stirred at a high speed, bentonite liquid is conveyed into the second stirring tank from the third stirring tank through the conveying pump to be mixed and stirred, finally the powder conveying component conveys cement powder into the second stirring tank to be fully stirred and made into liquid A, at the moment, the liquid A is input into the fourth stirring tank to be premixed, pulping of the liquid A is completed, and the stirred liquid A is conveyed to the liquid A pulp storage tank to be stored according to actual construction requirements;
3. respectively setting the grouting pressure, the grouting speed and the grouting mix proportion of A, B liquid on a control system according to working conditions, wherein the theoretical mix proportion of the liquid A and the liquid B is 15.8: 1;
4. firstly, opening a liquid A grouting pump to enable a liquid A supply pipeline to start to supply liquid, when the grouting pressure of the liquid A is kept stable, opening a liquid B grouting pump to enable a liquid B supply pipeline to start to supply liquid, and mixing the liquid A and the liquid B in a mixer to form mixed liquid;
5. the monitoring unit monitors A, B real-time flow of liquid, and feeds back the result to the control system, the control system automatically adjusts the flow of liquid A and liquid B after receiving the feedback, the actual mixing ratio of liquid A, B is controlled to be basically consistent with the theoretical mixing ratio, the mixed liquid can reach a gelling state, and is synchronously injected into a shield tail gap through a grouting pipeline along with the propulsion of the shield machine;
6. after the slip casting of A, B liquid is completed, the slip casting pipeline is washed by high-pressure water, the discharged sewage is observed, and when the sewage is clear, the cleaning is completed.
In summary, the present embodiment has the following advantages:
1. the trolley is additionally arranged on the shield machine and synchronously moves along with the shield machine, so that short-distance transportation of the liquid A is realized, and synchronous grouting is implemented, and therefore, the liquid A can be conveyed from the ground to the shield machine without a mortar vehicle, so that the construction risk is reduced, the material transportation cross operation is reduced, the performance loss of the liquid A is reduced, and the grouting quality is ensured;
2. the construction amount of the conveying pipeline is greatly reduced, the labor intensity and the construction cost are reduced, and the construction efficiency is effectively improved;
3. the pulping process and the grouting process are closely matched, the cooperativity is good, and the high-efficiency integrated construction is realized;
4. by monitoring and controlling the real-time flow of the liquid A and the liquid B, the precise control and adjustment of the mixing ratio and the injection amount of the liquid A and the liquid B are realized, so that the slurry can be injected into the shield tail gap in the optimal state;
5. a ground mixing station is not required to be built, so that the occupied construction area is reduced, and the method is flexible and suitable for different construction environments;
6. the slip casting control of A, B liquid is integrated to the PLC control system, and the automation degree of slip casting process is high, and control accuracy is high, guarantees construction quality, improves the efficiency of construction.
The present invention has been described in detail in order to enable those skilled in the art to understand the invention and to practice it, and it is not intended to limit the scope of the invention, and all equivalent changes and modifications made according to the spirit of the present invention should be covered by the present invention.
Claims (10)
1. A slurry preparation-injection integrated method for synchronous double-liquid grouting in a shield tunnel is characterized in that: the integrated method adopts a mixing device and a grouting device which are connected with each other, wherein the mixing device is positioned in a shield tunnel and moves synchronously with a shield machine, and the mixing device comprises a tail trolley synchronously connected with the shield machine; the liquid A stirring unit and the powder supply unit of the liquid A are arranged on the tail trolley; a clear water supply unit; a liquid B supply unit;
the grouting equipment comprises a liquid A supply pipeline, a liquid B supply pipeline, a mixer, a grouting pipeline, a monitoring unit and a control system, wherein the liquid A supply pipeline, the liquid B supply pipeline and the grouting pipeline are respectively communicated with the mixer, the monitoring unit monitors the real-time flow of the liquid A and the liquid B in real time, the control system is used for setting various grouting parameters of the liquid A and the liquid B and automatically controlling and adjusting according to the real-time flow,
the integration method comprises the following steps:
s1, adding a trolley on the shield tunneling machine, designing the equipment sizes of the liquid A stirring unit and the powder supply unit according to the reasonable space layout of the trolley, and respectively installing the liquid A stirring unit and the powder supply unit on the trolley;
s2, firstly, adding clear water and bentonite into a stirring tank for stirring bentonite liquid, so that the bentonite and the clear water are mixed and stirred to prepare the bentonite liquid; secondly, adding a stabilizer, clear water, bentonite liquid and cement powder into a stirring tank for stirring the liquid A, and mixing and stirring to prepare liquid A;
s3, respectively setting grouting pressure, grouting speed and grouting mixing proportion of A, B liquid, and conveying the liquid A and the liquid B prepared in the S2 to mix A, B liquid at the tail of the shield to form mixed liquid;
s4, monitoring A, B real-time flow of the liquid by the monitoring unit, feeding the result back to the control system, automatically adjusting the flow of the liquid A and the liquid B after the feedback is received by the control system, controlling A, B actual mixing ratio of the liquid to be basically consistent with theoretical mixing ratio, enabling the mixed liquid to reach a gelled state, and synchronously injecting the mixed liquid into a shield tail gap through a grouting pipeline along with the propulsion of the shield tunneling machine;
s5, after grouting with A, B liquid is completed, flushing a grouting pipeline through high-pressure water, observing discharged sewage, and completing cleaning when the sewage is clear.
2. The integrated slurry preparation-injection method for synchronous double-fluid injection in the shield tunnel according to claim 1, which is characterized in that: the mixing device has a manual mode, a semi-automatic mode, and a fully-automatic mode.
3. The integrated slurry preparation-injection method for synchronous double-fluid injection in the shield tunnel according to claim 1, which is characterized in that: in S3, the mixing ratio of the liquid A to the liquid B is 14-16: 1.
4. The integrated slurry preparation-injection method for synchronous double-fluid injection in the shield tunnel according to claim 1, which is characterized in that: in S3, the liquid a supply line is first opened, and when the grouting pressure of the liquid a is kept stable, the liquid B supply line is opened again.
5. The integrated slurry preparation-injection method for synchronous double-fluid injection in the shield tunnel according to claim 1, which is characterized in that: the tail trolley comprises a bearing platform and a frame arranged on the bearing platform, wherein the powder supply unit is arranged at the top of the frame, and the liquid A stirring unit is arranged on the bearing platform.
6. The integrated slurry preparation-injection method for synchronous double-fluid injection in the shield tunnel according to claim 5, characterized in that: the powder supply unit comprises a bentonite powder tank, a cement powder tank, a dust collecting tank, a stabilizer tank and a plurality of powder conveying components, wherein the bentonite powder tank and the cement powder tank are both horizontal storage tanks and can be used for the shield tunneling machine to tunnel the grouting amount required by 11-13 rings; the dust collecting tank is arranged between the bentonite powder tank and the cement powder tank and is communicated to the tops of the inner cavities of the bentonite powder tank and the cement powder tank through pipelines respectively.
7. The integrated slurry preparation-injection method for synchronous double-fluid injection in the shield tunnel according to claim 5, characterized in that: the liquid A stirring unit comprises a first stirring tank, a second stirring tank, a third stirring tank communicated with the first stirring tank and a fourth stirring tank communicated with the second stirring tank, wherein the bentonite powder tank and the cement powder tank are respectively communicated with the first stirring tank and the second stirring tank, the first stirring tank and the second stirring tank are high-speed stirring tanks and are respectively used for high-speed stirring of bentonite liquid and liquid A, and the third stirring tank and the fourth stirring tank are low-speed stirring tanks and are respectively used for premixing operation of the bentonite liquid and the liquid A;
the second agitator tank with the fourth agitator tank constitutes a set of A liquid stirring group, A liquid stirring group has two sets ofly and sets up respectively bearing platform's relative both sides.
8. The integrated slurry preparation-injection method for synchronous double-fluid injection in the shield tunnel according to claim 1, which is characterized in that: the blender sets up apart from slip casting pipeline liquid outlet 2~5m department, just still be provided with the tee bend automatic valve between the liquid outlet of blender and the inlet of slip casting pipeline.
9. The integrated slurry preparation-injection method for synchronous double-fluid injection in the shield tunnel according to claim 1, which is characterized in that: the liquid A supply pipeline, the liquid B supply pipeline, the mixer, the grouting pipeline and the monitoring unit form a group of grouting groups, and the grouting equipment comprises a plurality of groups of grouting groups.
10. The integrated slurry preparation-injection method for synchronous double-fluid injection in the shield tunnel according to claim 9, characterized in that: the grouting equipment also comprises an A liquid grouting tank, a B liquid grouting tank, an A liquid grouting pump correspondingly arranged on each A liquid supply pipeline and a B liquid grouting pump correspondingly arranged on each B liquid supply pipeline, wherein each A liquid grouting pump and each B liquid grouting pump can be independently controlled; the monitoring unit is an electromagnetic flowmeter arranged at each of the liquid A grouting pump and the liquid B grouting pump.
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| CN114278317B (en) | 2022-12-13 |
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