CN116220704A - Shield synchronous grouting slurry injection method based on PLC automatic control - Google Patents
Shield synchronous grouting slurry injection method based on PLC automatic control Download PDFInfo
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- CN116220704A CN116220704A CN202310213761.4A CN202310213761A CN116220704A CN 116220704 A CN116220704 A CN 116220704A CN 202310213761 A CN202310213761 A CN 202310213761A CN 116220704 A CN116220704 A CN 116220704A
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- 238000002347 injection Methods 0.000 title claims abstract description 56
- 239000007924 injection Substances 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 56
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 31
- 239000002002 slurry Substances 0.000 title claims abstract description 25
- 230000005641 tunneling Effects 0.000 claims abstract description 83
- 238000011084 recovery Methods 0.000 claims description 14
- 239000004570 mortar (masonry) Substances 0.000 claims description 12
- 239000011435 rock Substances 0.000 claims description 9
- 239000002689 soil Substances 0.000 claims description 7
- FFBHFFJDDLITSX-UHFFFAOYSA-N benzyl N-[2-hydroxy-4-(3-oxomorpholin-4-yl)phenyl]carbamate Chemical compound OC1=C(NC(=O)OCC2=CC=CC=C2)C=CC(=C1)N1CCOCC1=O FFBHFFJDDLITSX-UHFFFAOYSA-N 0.000 claims 1
- 230000015556 catabolic process Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 238000007667 floating Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000007569 slipcasting Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 230000033001 locomotion Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/0607—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining the shield being provided with devices for lining the tunnel, e.g. shuttering
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/093—Control of the driving shield, e.g. of the hydraulic advancing cylinders
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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Abstract
The invention provides a shield synchronous grouting slurry injection method based on PLC automatic control, which comprises the following steps: s100, a grouting system acquires a grouting mode selection signal and a tunneling state signal of a shield machine, and if the shield machine is in a tunneling state, step S300 is executed; s300, a grouting system acquires a shield tunneling management stroke, and determines a section where current tunneling is located, wherein the section is divided by a tunneling step length L; s500, calculating the grouting speed S of the section according to the tunneling condition of the previous section i . The method realizes the functions of controllable synchronous grouting time, adjustable flow, single-hole grouting proportion on-demand control and single-pipe overrun pump stop, improves the control precision of the synchronous grouting process, and ensures the sufficient, uniform and targeted injection of the synchronous grouting slurry.
Description
Technical Field
The invention relates to the technical field of shield engineering, in particular to a shield synchronous grouting slurry injection method based on PLC automatic control.
Background
The shield synchronous grouting aims to timely fill a gap behind the tunnel lining segment wall, prevent overlarge settlement of stratum, and simultaneously stabilize the lining segment and prevent overlarge floating of the segment. In the prior art, most shield operation systems are provided with synchronous grouting modules, a shield driver operates on a control panel, in general, grouting operation is started about 10cm after the shield starts tunneling, and is completely stopped about 10cm before single-ring tunneling is completed, grouting in the middle tunneling process is controlled by calculating grouting pressure and grouting amount based on a standard theory, but grouting pressure and grouting amount indexes cannot be matched at the same time, and generally after the pressure reaches a control value, if the grouting amount still does not reach the theoretical grouting amount, grouting pressure can be properly increased on site to ensure grouting plumpness. However, in the actual construction process, due to the reasons of data acquisition mode, defects of monitoring equipment and the like, the obtained grouting amount and grouting pressure data often cannot provide basis for grouting decision well, and the concrete grouting time completely depends on the experience of a shield driver. In addition, because a shield driver needs to consider a plurality of construction parameters such as shield thrust, torque, slag tapping and the like, sometimes control over synchronous grouting is neglected, grouting quality is poor due to a plurality of factors, and problems such as overlarge stratum settlement, floating of segments and the like are caused frequently.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a shield synchronous grouting slurry injection method based on PLC automatic control, which realizes the functions of controllable synchronous grouting time, adjustable flow, single-hole grouting proportion on-demand control, single-pipe overrun pump stopping and the like, improves the control precision of the synchronous grouting process, and ensures sufficient, uniform and targeted injection of synchronous grouting slurry.
The invention provides a shield synchronous grouting slurry injection method based on PLC automatic control, which comprises the following steps:
s100, a grouting system acquires a grouting mode selection signal and a tunneling state signal of a shield machine, and if the shield machine is in a tunneling state, step S300 is executed;
s300, a grouting system acquires a shield tunneling management stroke, and determines a section where current tunneling is located, wherein the section is divided by a tunneling step length L;
s500, calculating the grouting speed S of the section according to the tunneling condition of the previous section i 。
Further, the method includes step S400: judging whether the current tunneling section is the first section, if so, selecting the preset grouting speed of the first section as the grouting speed of the section according to the grouting mode, otherwise, executing the step S500.
Further, in the step S500, if the current grouting mode is the normal mode or the soft soil mode, the average tunneling speed V of the previous section is determined i-1 And the current residual mortar volume M i Calculate the grouting speed S of the section i 。
Further, the grouting speed S of the section i ＝M i /(L-K i )×V i-1 Wherein V is i-1 ＝D i-1 /T i-1 ，M i ＝M 0 -J i X Q; wherein L is tunneling step length, K i Is the current tunneling travel, D i-1 For the length of the last section, T i-1 When tunneling the last section, M 0 For the initial mortar volume, J i The accumulated stroke number for the current grouting pump and Q are the single-stroke grouting quantity.
Further, in the step S500, if the current grouting mode is the hard rock mode, the maximum grouting speed of the grouting pump is used as the grouting speed S of the section i The grouting amount of the section is Q i ，Q i Number of grouting strokes N according to the present section theory i Performing calculation, wherein Q i-1 The theoretical grouting amount corresponding to the previous section.
Further, the method includes step S600: if the current grouting mode is a general mode or a hard rock mode, judging whether the section where the current tunneling is positioned in an initial under-pressure injection section or a tail under-pressure injection section, if so, sending a reduction signal to a grouting pump, and then positioning the sectionIs set at the grouting speed S i And carrying out reduction, wherein the initial undervoltage injection section comprises first n sections in a tunneling step length L, the tail undervoltage injection section comprises last m sections in the tunneling step length L, and the tunneling step length L comprises an initial undervoltage injection section, a tail undervoltage injection section and an intermediate section arranged between the initial undervoltage injection section and the tail undervoltage injection section.
Further, step S700: the grouting system obtains the preset grouting pipeline proportion number, calculates the grouting speed of each grouting pipeline of the section according to the grouting speed of the section, respectively sends an adjusting signal to each grouting pipeline, adjusts the grouting speed of each grouting pipeline and starts grouting, wherein the grouting pipeline proportion number is the ratio of the grouting speeds of the grouting pipelines.
Further, the method for controlling the grouting pressure of the grouting pipeline comprises the following steps of: the grouting system acquires the actual grouting pressure P on each grouting pipeline in real time 1 Judgment of P 1 Whether or not it is greater than P 0 If yes, judge P 1 Maintained at greater than P 0 If the stroke count of the grouting pump is larger than b, sending an overrun discount signal to the grouting pipeline, and carrying out overrun discount on the current grouting speed of the grouting pipeline; p (P) 0 An upper pressure limit is preset for each grouting pipeline.
Further, the method of controlling grouting pressure further comprises: after the current grouting speed of a grouting pipeline is reduced by overrun, judging P after grouting of a grouting pump on the grouting pipeline completes one stroke 1 Whether or not it is greater than P 0 If yes, sending an overrun discount signal to the grouting pipeline again, and carrying out overrun discount on the current grouting speed of the grouting pipeline again: otherwise, judge P 1 Maintained at less than P 0 If the stroke count within the duration of (a) is greater than b, then sending a recovery signal to the grouting pipeline to recover the grouting speed of the grouting pipeline to the initial grouting speed.
Further, the method of controlling grouting pressure further comprises: when the grouting speed of a grouting pipeline is restored to the initial grouting speed, judging the grouting in the follow-up grouting processP of pulp pipeline 1 Whether or not it is greater than P 0 If P is detected again 1 ＞P 0 Judging P after the grouting speed of the grouting pipeline is restored to the initial grouting speed 1 Maintained at less than P 0 Whether the stroke count is less than d and P 1 Maintained at greater than P 0 If the stroke count in the duration of (a) is greater than b, sending an overrun recovery signal to the grouting pipeline, and taking the initial grouting speed of the grouting pipeline multiplied by the overrun recovery coefficient r as the new initial grouting speed of the grouting pipeline.
The beneficial effects of the invention are as follows:
1. according to the invention, the shield tunneling stroke is divided into different sections, namely, the shield tunneling stroke is divided into a plurality of sections, and for a general mode and a soft soil mode, the grouting speed of the section is calculated by utilizing the average tunneling speed of the previous section, so that on one hand, the adjusting frequency of the grouting speed can be reduced, the shortage of grouting amount caused by program confusion is prevented, and on the other hand, the sectional adjustment of grouting flow can be realized, the control precision of the synchronous grouting process is improved, and the synchronous grouting slurry of each section is sufficient and uniform.
2. According to the method, aiming at a general stratum and a hard rock stratum, a tunneling step length is divided into a head under-pressure injection section, a middle section and a tail under-pressure injection section, and synchronous grouting at under-pressure injection of a distance (the head under-pressure injection section and the tail under-pressure injection section) before and after shield shutdown is realized through a program, so that the pressure at the tail part of a shield machine is ensured not to be too large, and the protection of shield tail sealing is facilitated; the grouting system can control the grouting quantity and time of the head under-pressure injection section and the tail under-pressure injection section which are divided into a plurality of sections more accurately.
3. According to the invention, the proportion number among different grouting pipelines is set in advance according to the changes of stratum, shield posture, duct piece posture and the like, so that the grouting quantity of the different grouting pipelines is controlled as required, the targeted control of stratum settlement, duct piece and shield machine floating is facilitated, and the lining duct piece forming quality can be effectively improved.
4. The invention needs to acquire the current residual mortar volume in real time when calculating the grouting speed of the current section, and the current residual mortar volume is a real-time accurate value, thereby reducing the influence of factors such as abrasion and blockage of pumps and pipe equipment on grouting quantity.
5. According to the invention, the grouting resistance is fed back through the relative value of the grouting pressure, and when the grouting resistance exceeds a set value, the grouting speed is reduced or the pump is stopped in time, so that the condition of slurry leakage of the shield tail caused by the breakdown of the shield tail due to the overlarge pressure is avoided.
6. The invention uses the stroke count as the time judgment standard, when the limit of a grouting pipeline is reduced, the grouting pressure P 1 Restoring to less than the upper pressure limit P 0 When the stroke count in the time period of (a) is large, the slip casting speed is reduced by overrun again, so that the slip casting pressure P can be increased 1 And the normal pressure is recovered, and the breakdown of the shield tail caused by the excessive pressure exceeding duration is prevented.
7. The invention is applied to grouting pressure P 1 The grouting pressure P reappears after the normal pressure is restored 1 Rising above the upper pressure limit P 0 And is greater than P 0 If the stroke count of the grouting line is too large, determining that the initial grouting speed is too large, at the moment, performing overrun reduction on the grouting speed, wherein the grouting pressure P of the grouting line 1 After the normal grouting pipeline is recovered, the initial grouting speed of the grouting pipeline is multiplied by the overrun recovery coefficient r to be used as the new initial grouting speed of the grouting pipeline, so that the overlarge grouting pressure caused by overlarge grouting speed is prevented, and the situation that the normal pressure cannot be recovered due to repeated overrun reduction of a certain grouting pipeline is avoided.
Drawings
FIG. 1 is a schematic diagram of grouting speed control in a general mode and a soft soil mode according to the present invention;
FIG. 2 is a flow chart of the grouting method of the invention;
FIG. 3 is a flow chart of the control of the grouting opening in the general mode of the invention;
FIG. 4 is a flow chart of the grouting opening distribution of the grouting pipeline;
FIG. 5 is a flow chart of grouting pressure control of the grouting pipeline.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved by the present application more clear, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
As shown in fig. 1, the grouting speed of the grouting pump is calculated through the shield management stroke and the average tunneling speed, and the concrete grouting speed on each grouting pipeline is finally obtained through proportional distribution and grouting pressure control on different grouting pipelines, so that sufficient, uniform and targeted grouting is realized.
The invention provides a shield synchronous grouting slurry injection method based on PLC automatic control, which comprises the following steps:
s1, the grouting system acquires an operation desk control signal and judges whether the automatic control is performed, if not, a driver manually controls grouting, otherwise, the grouting system acquires a tunneling state signal of the shield machine, if the shield machine is in a tunneling state, the step S2 is executed, otherwise, grouting is closed, judging whether single-ring tunneling is finished, if yes, the current-ring tunneling is finished, and otherwise, the operation desk control signal is continuously acquired.
The single-ring tunneling refers to a tunneling step length L of the shield tunneling machine, tunnel linings are spliced and connected one by one in the tunneling process of the shield tunnel, the length of one ring is the width of the tunnel lining, the width of a common small-diameter shield tunnel single-ring lining is 1.2m and 1.5m, and the width of a large-diameter shield tunnel single-ring lining is 1.8m and 2.0m. In this embodiment, l=2m.
S2, the grouting system acquires a grouting mode selection signal, and if the current grouting mode is a general mode, the step S2.1 is executed; if the current grouting mode is a soft soil mode, executing the step S2.2; if the current grouting mode is the hard rock mode, step S2.3 is executed.
The soft soil mode is suitable for the stratum with high compressibility and poor self-stability, the hard rock mode is suitable for the stratum with high strength and good self-stability, and the general mode is suitable for the stratum with good self-stability.
S2.1, a grouting system acquires a shield tunneling management stroke, and a current tunneling section is determined, wherein the current tunneling section is divided by a tunneling step length L, and the shield tunneling management stroke is an oil cylinder management stroke of a shield machine; and judging whether the current tunneling section is the first section, if so, setting the grouting speed of the section to be zero, otherwise, executing the step S3.
S2.2, the grouting system acquires a shield tunneling management stroke, determines a current tunneling section, judges whether the current tunneling section is a first section, if so, sets the grouting speed of the section to 40% of the maximum grouting speed, and if not, executes the step S3.
S2.3, the grouting system acquires a shield tunneling management stroke, determines a current tunneling section, judges whether the current tunneling section is a first section, if so, sets the grouting speed of the section to be zero, and if not, executes the step S4.
According to the method, grouting parameters of the section are calculated according to grouting conditions of the previous section, and the grouting speed of the first section needs to be preset because the first section lacks parameters of the previous section, so that the grouting speed of the first section can be determined according to actual geological conditions for a stratum with good self stability and a stratum with high strength and good self stability without grouting the first section, and for a stratum with high compressibility and poor self stability.
The control of the grouting speed is realized by adjusting the injection frequency of the grouting pump, the grouting opening is defined as the ratio of the actual injection frequency of the grouting pump to the maximum injection frequency of the grouting pump, and the maximum grouting speed is the grouting speed when the grouting pump has the maximum grouting opening.
S3, according to the average tunneling speed V of the previous section i-1 And the current residual mortar volume M i Calculate the grouting speed S of the section i Step S5 is executed; grouting speed S of the section i ＝M i /(L-K i )×V i-1 Wherein V is i-1 ＝D i-1 /T i-1 ，M i ＝M 0 -J i X Q; wherein L is tunneling step length, K i Is the current tunneling travel, D i-1 For the length of the last section, T i-1 For driving the last sectionTime, M 0 For the initial mortar volume, J i The accumulated stroke number for the current grouting pump, Q is the single-stroke grouting amount, and i represents the ith section, namely the section.
The working principle of the shield grouting pump is similar to that of a piston, the slurry is sucked and discharged back and forth, the stroke number is the number of reciprocating motions, one reciprocating slurry sucking and discharging is one time, and the grouting quantity of each stroke is a fixed value.
In order to ensure that the slurry planned to be injected fills the excavation gap uniformly, the grouting speed is higher as the tunneling speed is higher, and the grouting speed is lower as the tunneling speed is lower, and the grouting speed are linearly related without considering correction.
In the actual construction process, the tunneling speed of the shield construction process is dynamically adjusted in real time by a shield driver, if the shield driver continuously adjusts the grouting speed according to the tunneling speed, the grouting speed is excessively high in adjusting frequency, and a grouting pump receives a new instruction when the previous program instruction is not executed, so that the program is disordered; because the condition of suspending tunneling is most likely to occur during the shield tunneling period, the time cannot be used as the dividing basis of grouting quantity, and the shield management stroke, namely the stroke of the oil cylinder, is used as the dividing basis, so that the shield management stroke is divided into a plurality of sections, and one shield management stroke corresponds to one tunneling step length L, namely one ring; in addition, the tunneling speed which is not executed in the current section cannot be obtained in the tunneling process, so that the average tunneling speed in one section is used for controlling the grouting speed of the next section, on one hand, the adjusting frequency of the grouting speed can be reduced, the defect of insufficient grouting amount caused by program confusion is prevented, on the other hand, the sectional adjustment of grouting flow can be realized, the control precision of the synchronous grouting process is improved, and the synchronous grouting slurry of each section is sufficient and uniform; and the current residual mortar volume needs to be obtained in real time when the grouting speed of the current section is calculated, and the current residual mortar volume is a real-time accurate value, so that the influence of factors such as abrasion and blockage of pumps and pipe equipment on the grouting amount is reduced.
S4, taking the maximum grouting speed as the grouting speed S of the section i Grouting quantity Q of this section i According to the sectionTheoretical grouting stroke number N i Control is performed, and step S5 is executed; n (N) i ＝Q i-1 /Q，Q i-1 ＝M i /(L-K i )×D i-1 ；
In which Q i-1 For the theoretical grouting amount, M corresponding to the previous section i Is the current remaining mortar volume.
In the case of a hard rock mode, grouting is performed on the section at a maximum grouting speed, the grouting is controlled according to the principle of 'tunneling one section and grouting one section', and Q i In practice, the theoretical grouting amount required for the previous section is set in the section to be grouting, for example, the first section is not grouting, and the second section is started to complete grouting amount Q according to the maximum grouting speed 2 Stopping grouting in the second section, waiting for entering the next section, and completing grouting according to the maximum grouting speed when the third section starts 3 And so on … ….
S5, if the grouting mode is a general mode or a hard rock mode, judging whether the section where the current tunneling is positioned in an initial under-pressure injection section or a tail under-pressure injection section, if so, sending a reduction signal to a grouting pump, and setting the grouting speed S of the section i Performing reduction, namely multiplying the grouting speed of the section by an under-pressure injection coefficient g, wherein g=50%, namely, the grouting speed of the initial under-pressure injection section or the tail under-pressure injection section is 50% of the grouting speed calculated in the step S3 or the step S4; the head undervoltage injection section comprises the first 4 sections in the tunneling step length L, the tail undervoltage injection section comprises the last 1 sections in the tunneling step length L, and the rest sections are middle sections.
For the high-compressibility soft soil stratum, sufficient grouting is needed in one tunneling step length, so that the first under-pressure injection section and the tail under-pressure injection section do not need to be divided.
In this embodiment, the division and grouting speed of each section are:
0-25 mm, which is an initial grouting opening degree of 0% for the first under-pressure injection section;
25-50 mm, namely an initial under-voltage injection section, calculating the grouting opening of the section and multiplying the grouting opening by an under-voltage injection coefficient by 50%;
50-75 mm, namely a head under-voltage injection section, calculating the grouting opening of the section and multiplying the grouting opening by an under-voltage injection coefficient by 50%;
75-100 mm, namely a head under-voltage injection section, calculating the grouting opening of the section and multiplying the grouting opening by an under-voltage injection coefficient by 50%;
100-1900 mm, dividing a section into a middle section according to 100mm, and calculating the grouting opening of the section;
1900-2000 mm, namely a tail undervoltage injection section, which is also the last section, and calculating the grouting opening of the section and multiplying the grouting opening by the undervoltage injection coefficient by 50%.
The control method for the grouting speed of each section in the general mode is shown in fig. 3.
S6, the grouting system acquires a preset grouting pipeline proportion number, calculates the grouting speed of each grouting pipeline of the section according to the grouting speed of the section, and respectively sends an adjusting signal to each grouting pipeline to adjust the grouting speed of each grouting pipeline and start grouting, wherein the grouting pipeline proportion number is the ratio of the grouting speeds of the grouting pipelines. If the grouting speed of a single pipeline or a plurality of pipelines exceeds the rated grouting speed, setting the grouting speed of the pipelines to be the maximum, and distributing the residual grouting quantity to the rest pipelines in proportion.
Specifically, each grouting pipeline is provided with a grouting speed control signal, the speed of the grouting speed (the frequency of the pump, namely the speed of the stroke) can be adjusted, the grouting speed is controlled in a percentage mode, when the grouting opening is 100%, the grouting speed is the fastest, and after the grouting opening corresponding to the grouting pipeline proportion number and the grouting speed is set, the opening of each grouting pipeline can be automatically calculated. The method aims at the problems of floating and snaking of lining segments of the shield tunnel forming tunnel, and the like, and can effectively improve the forming quality of the lining segments by locally increasing the grouting quantity and limiting the deflection space of the lining segments by adjusting the opening of each grouting pipeline.
In this embodiment, four grouting pipelines are provided, and the ratio of the four grouting pipelines is No.1: no.2: no.3: no. 4=2: 2:1:1, calculating the grouting opening of the section to be 60% according to the average tunneling speed of the previous section; assuming that the grouting opening of No.3 is x, the grouting opening of No.1 is 2x, the grouting opening of No.2 is 2x, and the grouting opening of No.4 is x, (2x+2x+x+x)/4=60, to obtain x=40, the grouting opening of No.1 is 80%, the grouting opening of No.2 is 80%, the grouting opening of No.3 is 40%, the grouting opening of No.4 is 40%, and the grouting system can perform grouting control according to the grouting opening of each grouting pipeline.
S7, controlling grouting pressure of a grouting pipeline, wherein the method for controlling grouting pressure comprises the following steps: the grouting system acquires the actual grouting pressure P on each grouting pipeline in real time 1 Judgment of P 1 Whether or not it is greater than P 0 If yes, judge P 1 Maintained at greater than P 0 If the stroke count of the grouting pump is larger than b, sending an overrun discount signal to the grouting pipeline, and carrying out overrun discount on the current grouting speed of the grouting pipeline; p (P) 0 An upper pressure limit is preset for each grouting pipeline.
It should be noted that, when the grouting speed is too high or the grouting pipe is blocked, the grouting pressure is too high. The stroke count is similar to time, with the time of a stroke being substantially fixed, the greater the stroke count, the longer the description time; each grouting pipeline is provided with a pressure sensor for monitoring grouting pressure.
Specifically, the overrun reduction is performed by multiplying the current grouting speed by an overrun reduction coefficient h, where 0< h <1, in this embodiment, b=5, and the overrun reduction coefficient h=50%.
P 1 Monitoring pressure P for pressure sensor in shield pushing process 2 With pressure P at the beginning of a ring 3 Is the difference of P 3 Refers to the pressure reading of the pressure gauge when not grouting, and the pressure sensor is easy to be influenced by mortar, so that the pressure reading of the pressure sensor cannot be zeroed, and the grouting pressure P in the actual grouting process is represented by the relative value of the pressure in the grouting process and the pressure when not grouting 1 So that the grouting pressure P 1 More accurate.
When P 1 ＞P 0 And P is 1 Maintained at greater than P 0 The stroke count of the grouting pump is greater than five for the duration of (a)That is, when P is detected 1 Rising to greater than P 0 And P is 1 Maintained at greater than P 0 The duration of (2) being greater than or equal to the time required for five strokes, indicating the grouting pressure P on the grouting line 1 In excess of P 0 The later lasting time is too long, the grouting pressure is too high, and the grouting speed of the grouting pipeline is required to be reduced by overrun, namely, the grouting speed is reduced to half, so that the grouting pressure is rapidly reduced, the grouting pressure is ensured to be maintained in a normal range, and the condition that the grouting is leaked from the tail of the shield due to the fact that the tail of the shield breaks down due to the too high pressure is avoided; if P 1 ＞P 0 And P is 1 Maintained at greater than P 0 The duration of (2) is less than the time required for five strokes, P 1 Then return to less than P 0 And (3) the normal pressure of the grouting pressure is not abnormal.
S7.1, after the current grouting speed of a grouting pipeline is subjected to overrun reduction, judging P after grouting of a grouting pump on the grouting pipeline is completed for one stroke 1 Whether or not it is greater than P 0 If yes, sending an overrun discount signal to the grouting pipeline again, and carrying out overrun discount on the current grouting speed of the grouting pipeline again: otherwise, judge P 1 Maintained at less than P 0 If the stroke count within the duration of (a) is greater than b, then sending a recovery signal to the grouting pipeline to recover the grouting speed of the grouting pipeline to the initial grouting speed.
It should be noted that, after the grouting pressure on a grouting pipeline is reduced by an overrun, the grouting pressure needs to be reduced as soon as possible and the grouting speed needs to be restored to the initial grouting speed again, so as to prevent the grouting speed from being restored to the initial grouting speed after the grouting speed is reduced by the overrun, and the time for restoring to the initial grouting speed is too long, which results in breakdown of the shield tail, and the initial grouting speed is the grouting speed of the grouting pipeline calculated in the step S6.
In this embodiment, it can be understood that, after the current grouting speed is multiplied by the overrun reduction coefficient h for overrun reduction, the grouting pressure P of the grouting pipeline is calculated in one stroke 1 Then return to less than P 0 Then the grouting pressure P is described 1 The normal recovery speed is high, and the degree of reduction is highAcceptable; otherwise, the grouting pressure P is accelerated by carrying out overrun reduction on the overrun reduced grouting speed again 1 Can prevent the breakdown of the shield tail caused by the overlong recovery time.
S7.2, judging the P of the grouting pipeline in the follow-up grouting process after the grouting speed of a certain grouting pipeline is restored to the initial grouting speed 1 Whether or not it is greater than P 0 If P is detected again 1 ＞P 0 Judging P after the grouting speed of the grouting pipeline is restored to the initial grouting speed 1 Maintained at less than P 0 Whether the stroke count is less than d and P 1 Maintained at greater than P 0 If the stroke count in the duration of (a) is greater than b, sending an overrun recovery signal to the grouting pipeline, and taking the initial grouting speed of the grouting pipeline multiplied by the overrun recovery coefficient r as the new initial grouting speed of the grouting pipeline.
Specifically, d=10, the overrun recovery coefficient r is an average value of 1 and a total coefficient of the pressure overrun to the pressure normal process, for example, if two overrun folds are made, each overrun fold is reduced by 50%, the total coefficient of the pressure overrun to the pressure normal process is 25%, and r= (25++1)/2=62.5%, i.e., the initial grouting speed of the grouting pipeline is multiplied by 62.5% to be the new initial grouting speed of the grouting pipeline.
When the grouting speed of a grouting pipeline is restored to the original grouting speed, the grouting pressure P of the grouting pipeline 1 Maintained at less than P 0 The duration of which is less than the time required for ten strokes, and the grouting pressure P of the grouting pipeline 1 Rising to greater than P 0 After that, maintain at greater than P 0 If the duration of the grouting line is longer than or equal to the time required by five strokes, the grouting speed is larger, the initial grouting speed needs to be reduced, and the overrun reduction is carried out first, and the grouting pressure P of the grouting line is reduced 1 After the normal state is recovered, the grouting speed of the grouting pipeline is recovered to the initial grouting speed multiplied by the overrun recovery coefficient d, so that the overlarge grouting pressure caused by overlarge grouting speed is prevented, and the condition that the normal pressure cannot be recovered due to repeated overrun reduction of a certain grouting pipeline is avoidedThe condition is as follows.
A concrete grouting pressure control method of each grouting pipeline is shown in fig. 5.
The above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.
Claims (10)
1. A shield synchronous grouting slurry injection method based on PLC automatic control is characterized in that: the method comprises the following steps:
s100, a grouting system acquires a grouting mode selection signal and a tunneling state signal of a shield machine, and if the shield machine is in a tunneling state, step S300 is executed;
s300, a grouting system acquires a shield tunneling management stroke, and determines a section where current tunneling is located, wherein the section is divided by a tunneling step length L;
s500, calculating the grouting speed S of the section according to the tunneling condition of the previous section i 。
2. The method for injecting the shield synchronous grouting slurry based on the automatic control of the PLC according to claim 1, which is characterized in that: comprising the step S400: judging whether the current tunneling section is the first section, if so, selecting the preset grouting speed of the first section as the grouting speed of the section according to the grouting mode, otherwise, executing the step S500.
3. The method for injecting the shield synchronous grouting slurry based on the automatic control of the PLC according to claim 1, which is characterized in that: in the step S500, if the current grouting mode is the normal mode or the soft soil mode, the average tunneling speed V of the previous section is determined i-1 And at presentResidual mortar volume M i Calculate the grouting speed S of the section i 。
4. The method for injecting the shield synchronous grouting slurry based on the automatic control of the PLC according to claim 3, wherein the method comprises the following steps: grouting speed S of the section i ＝M i /(L-K i )×V i-1 Wherein V is i-1 ＝D i-1 /T i-1 ，M i ＝M 0 -J i X Q; wherein L is tunneling step length, K i Is the current tunneling travel, D i-1 For the length of the last section, T i-1 When tunneling the last section, M 0 For the initial mortar volume, J i The accumulated stroke number for the current grouting pump and Q are the single-stroke grouting quantity.
5. The method for injecting the shield synchronous grouting slurry based on the automatic control of the PLC according to claim 1, which is characterized in that: in the step S500, if the current grouting mode is the hard rock mode, the maximum grouting speed of the grouting pump is used as the grouting speed S of the section i The grouting amount of the section is Q i ，Q i Number of grouting strokes N according to the present section theory i Performing calculation, N i ＝Q i-1 /Q，Q i-1 ＝M i /(L-K i )×D i-1 In which Q i-1 The theoretical grouting amount corresponding to the previous section.
6. The method for injecting the shield synchronous grouting slurry based on the automatic control of the PLC according to claim 1, which is characterized in that: comprising the step S600: if the current grouting mode is a general mode or a hard rock mode, judging whether the section where the current tunneling is positioned in an initial under-pressure injection section or a tail under-pressure injection section, if so, sending a reduction signal to a grouting pump, and setting the grouting speed S of the section i The method comprises the following steps of carrying out reduction, wherein the initial undervoltage injection section comprises first n sections in a tunneling step length L, the tail undervoltage injection section comprises last m sections in the tunneling step length L, and the tunneling step length L comprises an initial undervoltage injection section, a tail undervoltage injection section and a tail undervoltage injection section, wherein the initial undervoltage injection section and the tail undervoltage injection section are arranged in the initial undervoltage injection sectionAn intermediate section therebetween.
7. The method for injecting shield synchronous grouting slurry based on automatic control of PLC according to any one of claims 1 to 6, wherein the method comprises the following steps: comprising the step S700: the grouting system obtains the preset grouting pipeline proportion number, calculates the grouting speed of each grouting pipeline of the section according to the grouting speed of the section, respectively sends an adjusting signal to each grouting pipeline, adjusts the grouting speed of each grouting pipeline and starts grouting, wherein the grouting pipeline proportion number is the ratio of the grouting speeds of the grouting pipelines.
8. The method for injecting shield synchronous grouting slurry based on automatic control of PLC according to any one of claims 1 to 6, wherein the method comprises the following steps: the method for controlling the grouting pressure comprises the steps of: the grouting system acquires the actual grouting pressure P on each grouting pipeline in real time 1 Judgment of P 1 Whether or not it is greater than P 0 If yes, judge P 1 Maintained at greater than P 0 If the stroke count of the grouting pump is larger than b, sending an overrun discount signal to the grouting pipeline, and carrying out overrun discount on the current grouting speed of the grouting pipeline; p (P) 0 An upper pressure limit is preset for each grouting pipeline.
9. The method for injecting the shield synchronous grouting slurry based on the automatic control of the PLC according to claim 8, wherein the method comprises the following steps: the method of controlling grouting pressure further comprises: after the current grouting speed of a grouting pipeline is reduced by overrun, judging P after grouting of a grouting pump on the grouting pipeline completes one stroke 1 Whether or not it is greater than P 0 If yes, sending an overrun discount signal to the grouting pipeline again, and carrying out overrun discount on the current grouting speed of the grouting pipeline again: otherwise, judge P 1 Maintained at less than P 0 If the stroke count in the duration of (a) is greater than b, then sending a recovery signal to the grouting pipeline to recover the grouting speed of the grouting pipeline to the initial grouting speed。
10. The method for injecting the shield synchronous grouting slurry based on the automatic control of the PLC according to claim 9, wherein the method comprises the following steps: the method of controlling grouting pressure further comprises: after the grouting speed of a grouting pipeline is restored to the initial grouting speed, judging the P of the grouting pipeline in the subsequent grouting process 1 Whether or not it is greater than P 0 If P is detected again 1 ＞P 0 Judging P after the grouting speed of the grouting pipeline is restored to the initial grouting speed 1 Maintained at less than P 0 Whether the stroke count is less than d and P 1 Maintained at greater than P 0 If the stroke count in the duration of (a) is greater than b, sending an overrun recovery signal to the grouting pipeline, and taking the initial grouting speed of the grouting pipeline multiplied by the overrun recovery coefficient r as the new initial grouting speed of the grouting pipeline.
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| CN202310213761.4A CN116220704A (en) | 2023-03-08 | 2023-03-08 | Shield synchronous grouting slurry injection method based on PLC automatic control |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310213761.4A CN116220704A (en) | 2023-03-08 | 2023-03-08 | Shield synchronous grouting slurry injection method based on PLC automatic control |
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