CN117188469B - Constant-flow grouting control method for cement-soil mixing pile - Google Patents
Constant-flow grouting control method for cement-soil mixing pile Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 53
- 239000002689 soil Substances 0.000 title claims abstract description 22
- 239000004568 cement Substances 0.000 claims abstract description 88
- 239000002002 slurry Substances 0.000 claims abstract description 87
- 238000013461 design Methods 0.000 claims abstract description 83
- 238000005070 sampling Methods 0.000 claims abstract description 54
- 230000000737 periodic effect Effects 0.000 claims abstract description 16
- 238000004364 calculation method Methods 0.000 claims abstract description 13
- 238000001914 filtration Methods 0.000 claims abstract description 7
- 238000012937 correction Methods 0.000 claims description 65
- 238000010276 construction Methods 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 7
- 239000000654 additive Substances 0.000 claims description 6
- 230000000996 additive effect Effects 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 5
- 241000537371 Fraxinus caroliniana Species 0.000 claims description 4
- 235000010891 Ptelea trifoliata Nutrition 0.000 claims description 4
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 230000009191 jumping Effects 0.000 claims description 3
- 238000004537 pulping Methods 0.000 description 9
- 238000005507 spraying Methods 0.000 description 7
- 230000001276 controlling effect Effects 0.000 description 4
- 238000010348 incorporation Methods 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000009430 construction management Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 239000011378 shotcrete Substances 0.000 description 1
- 238000007569 slipcasting Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention discloses a constant-flow grouting control method for a cement-soil mixing pile, which comprises the steps of determining design flow through calculation according to design indexes; setting sampling period time, and calculating period design flow in a sampling period; setting the allowable deviation of the periodic design flow; setting sampling times in a sampling period; sampling and calculating the period effective flow and the period effective pressure in one sampling period through a sampling data filtering algorithm, and simultaneously, collecting the period effective frequency of the grouting motor; calibrating the period effective flow, measuring a setting constant K, and calculating to obtain the setting effective flow; judging whether the set effective flow is in the allowable deviation range or not; if not, the frequency of the grouting motor is adjusted; if yes, maintaining the frequency operation of the grouting motor; and continuing the next sampling period until grouting is finished. The invention can automatically and rapidly perform feedback control according to the change of the pipeline flow, and realize the accurate output of the cement slurry pipeline flow.
Description
Technical Field
The invention relates to the technical field of foundation treatment, in particular to a constant-flow grouting control method for a cement-soil mixing pile.
Background
Cement-soil mixing pile is made up by using cement as main material of solidifying agent, using stirring machine to forcedly stir solidifying agent and foundation soil, and utilizing a series of physical-chemical reactions produced between solidifying agent and foundation soil to make soil body be coagulated into pile body with integrity, water stability and a certain strength. According to different cement spraying states, powder spraying stirring piles (powder spraying piles) and wet spraying stirring piles (wet spraying piles) are divided, and currently, the wet spraying piles are widely applied to foundation and foundation engineering. The quality detection index of the cement-soil mixing pile is mainly the strength, the integrity and the uniformity of a pile body of the cement-soil mixing pile formed after construction. In order to ensure pile forming quality, indexes such as equal pile length, pile diameter, cement mixing amount, guniting lifting speed, stirring rotating speed and the like in the construction process must meet design and standard requirements, otherwise, unqualified piles are judged. Among the above construction quality control indexes, the cement admixture is the most difficult index to control, and is also the index for important monitoring in construction management. The cement incorporation amount, sometimes expressed as cement incorporation ratio in the design, refers to the mass ratio of cement to the soil body to be reinforced (natural state), and for example, the design requires 15% cement incorporation ratio, assuming that the density of the reinforced soil body is 1800kg/m 3 The cement incorporation amount was 1800×15+=270 kg/m 3 . Assuming that the diameter of the designed pile is 0.5m and the sectional area of the pile body is 0.19625m 2 The cement consumption per linear meter pile body is about 270× 0.19625 =53 kg, which requires that 53kg of cement can be uniformly mixed within the range of 1 linear meter pile body by a stirring machine in the construction process.
For wet-spraying piles, the cement mixing amount is controlled in the construction process, the prior art is realized by controlling the flow of cement paste, and the concrete method comprises the following steps: the operator firstly mixes cement with water according to the designed water-cement ratio to prepare cement slurry at the pulping background, then the grouting pressure of the grouting pump is adjusted in real time according to the display value of the pipeline flowmeter with the design flow as a target, so that the display value of the pipeline flowmeter is kept near the design flow. Although the current cement mixing pile monitoring technology based on the Internet of things is relatively mature, the method for manually controlling the flow of the cement slurry pipeline by manpower is also purely insufficient in the actual construction process:
(1) The cement mixing pile monitoring system is generally arranged on a pile machine, a pile machine operator can monitor in real time, a flowmeter is generally arranged close to the pile machine and even directly arranged on the pile machine for management, a pulping station is often tens of meters away from the pile machine, when the flow is deviated, the pile machine operator informs the pulping operator through an interphone, and the indirect feedback mode is purely time hysteresis; in addition, from the current situation of the cement mixing pile industry, the number of field operators is required to be compressed, the pile machine operators pay attention to the running condition of the pile machine at all times, and the pulping operators pay attention to all the works of a background pulping station, so that the operators are difficult to pay attention to the change of the pipeline flow at all times actively; this actual situation makes it difficult for the pulping operator to adjust the grouting pressure in real time.
(2) Because the wet-jet pile grouting adopts the reciprocating plunger pump, grouting pressure fluctuation is severe, peak-valley pressure difference is relatively large, so that pipeline flow is severely fluctuated, and distortion phenomenon exists in pipeline flow data acquisition, a grouting operator adjusts the pressure of the grouting pump by adjusting the motor frequency of the grouting pump according to own experience, and therefore the experience of the grouting operator and familiarity degree of the grouting pump performance can influence the accuracy of grouting quantity to a certain extent.
In practice, the change of the soil quality of the stratum and the change of the depth of the stirring head will require the corresponding change of the grouting pressure, otherwise, the flow of the pipeline will fluctuate, and the strength and uniformity of the pile body are further affected, so that a cement slurry constant flow grouting control method suitable for wet-jet piles needs to be developed.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a constant flow grouting control method for the cement-soil mixing pile, which automatically adjusts grouting pressure of a grouting pump in real time and automatically controls constant output of grouting flow through monitoring data feedback of on-line grouting management flow, thereby realizing accuracy and uniformity of cement mixing quantity within a pile length range.
In order to solve the technical problems, the invention provides a constant flow grouting control method for a cement-soil mixing pile, which is characterized by comprising the following steps:
the first step, according to the design index, determining the design flow Q through calculation d ；
Setting a sampling period T, and calculating a period design flow Q in the sampling period T dT ；
Thirdly, setting sampling times m in a sampling period T; setting a period design flow rate Q dT Allowable deviation AD of (a) QT ；
Fourth, through sampling data filtering algorithm, in one sampling period T, the instantaneous flow q of the measurement signal of the flow rate is measured i Sampling at intervals of m times continuously, and taking arithmetic average to obtain periodic effective flow Q Ti Collecting the frequency of the corresponding grouting motor, and recording the frequency as the period effective frequency F Ti ；
Fifth step, the effective flow Q of the calibration period Ti Measuring a setting constant K, and calculating to obtain a setting effective flow Q KTi ；
Sixth, judge and set the effective flow Q Tki Whether or not it is at the periodic design flow rate Q dT Allowable deviation AD of (a) QT Within the range;
if not, the period effective frequency F of the grouting motor is adjusted Ti And jumping to a fourth step;
if yes, the effective flow Q is set KTi Is collected as the actual flow meeting the requirement and maintains the periodic effective frequency F of the grouting motor Ti Unchanged, entering the next step;
step seven, jumping to the fourth step to enter the next sampling period T; and (5) until grouting is finished.
Further, in the sixth step, when judging to set the effective flow rate Q Tki At a periodic design flow rate Q dT Allowable deviation AD of (a) QT When the range is in, the density of grouting slurry is obtained, and the effective flow Q is regulated by adjusting the frequency of the grouting motor according to the density feedback KTi Adjusting, and setting the adjusted effective flow Q KTi The actual flow meeting the requirements is collected to control the ash mixing amount of the pile body.
Further, the density of grouting slurry is obtained by collecting pulping parameters, and the ash mixing amount of the pile body is controlled by adopting the following steps:
A. to design the water-cement ratio R d Based on the raw materials, different design water-cement ratios R are adopted according to the material mixing requirements d Preparing trial slurry, measuring the corresponding density, drawing a relation curve of water-cement ratio and slurry density, fitting to obtain a relation formula of water-cement ratio and slurry density, and designing a water-cement ratio R d The density in the corresponding "cement ratio-slurry density relation" is the design density ρ d ；
B. Setting the design density ρ d Allowable deviation AD of (a) ρ And setting the design density ρ d Is a correction limit value LD of (1) ρ ；
C. According to the design water-cement ratio R in the current construction requirement d Preparing grouting slurry, collecting current water adding amount L1, current cement amount L2, current additive A amount L3 and current additive B amount L4 of the grouting slurry, and calculating current water-cement ratio R on ；
D. The current water-cement ratio R on Substituting into the relation formula of the water-cement ratio and the slurry density to obtain the current density rho on ；
E. Calculating the current density ρ on And design density ρ d Is the difference D of (2) ρ ；
F. When the difference D ρ Beyond the allowable deviation AD ρ Range, and current density ρ on At the correction limit LD ρ In the range, at the current density ρ on Calculating a corresponding density correction flow Q based on ρ The method comprises the steps of carrying out a first treatment on the surface of the When the difference D ρ Beyond the allowable deviation AD ρ Range, and current density ρ on Exceeding correction limit LD ρ At the time of correction ofPositive limit LD ρ Calculating a corresponding density correction flow Q based on ρ The method comprises the steps of carrying out a first treatment on the surface of the Correcting flow rate Q according to density ρ Adjusting the frequency of the grouting motor;
when the current density ρ on And design density ρ d Is the difference D of (2) ρ At the allowable deviation AD ρ When the frequency of the grouting motor is in the range, the frequency of the grouting motor is not adjusted.
Further, a density correction flow rate Q is calculated ρ The formula of (2) is:；
when the difference D ρ Beyond the allowable deviation AD ρ When in range, the system sends out a density overrun alarm signal, and the current density rho on Exceeding correction limit LD ρ And when the range is in the range, the system sends out a density correction flow overrun alarm signal.
Further, the grouting slurry in the grouting pipeline is collected through a densimeter, the density of the grouting slurry is obtained, and the ash mixing amount of the pile body is controlled by adopting the following steps:
A. to design the water-cement ratio R d Based on the raw materials, different design water-cement ratios R are adopted according to the material mixing requirements d Preparing trial slurry, measuring the density of the corresponding trial slurry, drawing a relation curve of water-cement ratio and slurry density, fitting to obtain a relation formula of water-cement ratio and slurry density, and designing a water-cement ratio R d The density in the corresponding "cement ratio-slurry density relation" is the design density ρ d ；
B. Setting the design density ρ d Allowable deviation AD of (a) ρ And setting the design density ρ d Is a correction limit value LD of (1) ρ ；
C. The instantaneous density ρ of the signal is measured for the densitometer in one sampling period T by a sampling data filtering algorithm i Continuously sampling m times at intervals, taking arithmetic average to obtain effective density in current sampling period T, and recording as effective density ρ of pipeline period Ti ；
D. Calibrating the pipeline cycle effective density ρ Ti Determination of effective Density of pipe cycleThe correction coefficient lambda is calculated to obtain the effective density rho of the pipeline correction λTi ；
E. Calculating the effective density ρ of the pipeline correction λTi And design density ρ d Is the difference D of (2) λρ ；
F. When the difference D λρ Beyond the allowable deviation AD ρ Range, and current pipeline correction effective density ρ λTi At the correction limit LD ρ When in range, correct the effective density ρ with the current pipeline λTi Calculating the corresponding pipeline density correction flow Q based on the calculation λTi The method comprises the steps of carrying out a first treatment on the surface of the When the difference D λρ Beyond the allowable deviation AD ρ Range, and current pipeline correction effective density ρ λTi Exceeding correction limit LD ρ At the time, the limit LD is corrected ρ Calculating the corresponding pipeline density correction flow Q based on the calculation λρi The method comprises the steps of carrying out a first treatment on the surface of the Correcting flow Q based on pipeline density λρ Adjusting the frequency of the grouting motor;
when the difference D λρ At the allowable deviation AD ρ When the frequency of the grouting motor is in the range, the frequency of the grouting motor is not adjusted.
Further, calculating the corresponding pipeline density correction flow Q λTi ：
The effective density ρ of the pipeline is corrected first λTi Substituting the relation formula of the water-cement ratio and the slurry density to calculate the current water-cement ratio R on ；
Calculating the pipeline density correction flow through a formula；
When the difference D λρ Beyond the allowable deviation AD ρ When in range, the system sends out a density overrun alarm signal, and the current density rho on Exceeding correction limit LD ρ And when the range is in the range, the system sends out an over-limit alarm signal for correcting the flow of the pipeline density.
Further, the design indexes include ash mixing amount, water-ash ratio and lifting or dropping speed of gunite.
Further, the allowable deviation AD QT For a fixed value interval [ Q ] α ,Q β ]Or as perSet percentage times period design flow Q dT Is calculated for the obtained value interval.
Further, the frequency adjustment method of the grouting motor comprises the following steps: firstly, setting preset equiamount frequency, and according to the preset equiamount frequency, setting the period effective frequency F of the current grouting motor Ti Stepwise decreasing or increasing is performed and performed once in one sampling period T.
Further, the preset equifrequency is a fixed frequency value or is multiplied by the effective frequency F of the period of the grouting motor according to a preset percentage Ti Is calculated.
The invention has the beneficial effects that:
according to the method, through detection data acquisition feedback of online grouting management flow, the frequency of the grouting motor is automatically adjusted in real time to adjust grouting pressure, constant output of automatic grouting flow control is achieved, and accordingly accuracy and uniformity of cement mixing amount in a pile length range are achieved.
The primary grouting flow is judged through one sampling period, the judging frequency is high, the adjusting precision is high, when the flow is deviated, the adjustment can be carried out at the first time, the method is a direct feedback and adjustment mode, no hysteresis exists in time, and the effect of real-time adjustment is achieved; and the operator is not required to interfere and adjust, the number of operators is not required, and the labor cost is greatly reduced.
By introducing the grouting slurry density, the grouting flow is further adjusted, and the inclusion of the system on the grouting density deviation is further improved, so that the pile body ash mixing amount can still be ensured to meet the design requirement under the condition of moderate grouting density deviation, and the construction quality and the construction efficiency are greatly improved.
Drawings
FIG. 1 is a flow chart of a control method of the present invention;
FIG. 2 is a flow chart of the present invention for measuring pulp density to correct flow;
FIG. 3 is a flow chart of the present invention for measuring slurry density in a grouting pipe to correct flow;
FIG. 4 is a graph of the relationship between cement ratio and slurry density in accordance with the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific examples, which are not intended to be limiting, so that those skilled in the art will better understand the invention and practice it.
Referring to fig. 1, in an embodiment of the method for controlling constant flow grouting of a cement mixing pile according to the present invention, in a sampling period, a comparison and judgment are performed between a design data value and an actual data value, and a frequency of a grouting motor is adjusted according to a judgment result, so as to realize constant output of automatic control grouting flow, and the specific method is as follows:
firstly, calculating and determining design flow Q according to the ash mixing amount, the water-ash ratio and the lifting speed in the design index d The unit is L/min;
examples are as follows: the drilling speed of the guniting is 70-100cm/min, the ash mixing amount is 60kg/m according to 0.8m, the guniting is carried out for 1 time, and the water-ash ratio is 0.55;
the water weight: 60×0.55=33 kg; per linear meter slurry volume calculation: 33+60++3.15= 52.05L; when lifting grouting per linear meter, the following steps are adopted: 60×1++0.8=75s; design flow: 52.05 ≡75=0.694L/s, 0.694×60=41.64L/min.
Then setting sampling period T, which can be 2s, 1s, 0.5s or 0.2s, etc., as adjustable parameter to select proper sampling period, calculating period design flow Q in the sampling period T dT ，Q dT =TQ d ；
The cycle design flow Q is then set dT Allowable deviation AD of (a) QT The method comprises the steps of carrying out a first treatment on the surface of the Setting sampling times m in a sampling period T; wherein the flow rate Q is preferably designed periodically dT Allowable deviation AD of (a) QT For a set fixed value interval [ Q α ,Q β ]For example, [ -0.014,0.035]Or to design flow rate Q by multiplying a predetermined percentage by a period dT For example, [ -Q) d ×2%, Q d ×5%]；
According to the setting, referring to the designed grouting pressure range, adjusting the frequency of the grouting motor, and selecting proper grouting pressure as the initial power of the grouting motor;
by samplingData filtering algorithm, which is used for measuring instantaneous flow q of signal measured by flow rate in one sampling period T i Sampling at intervals of m times continuously, and taking arithmetic average to obtain periodic effective flow Q Ti The frequency of the corresponding grouting motor is collected at the same time, and the frequency of the grouting motor is not regulated in one sampling period, so that the frequency of the grouting motor is unique, can be directly read and obtained and recorded as the period effective frequency F Ti The method comprises the steps of carrying out a first treatment on the surface of the And when arithmetic average is taken, eliminating maximum and minimum values in the sampled data can be removed.
Calibration period effective flow Q Ti Measuring a setting constant K, and calculating to obtain a setting effective flow Q KTi The method comprises the steps of carrying out a first treatment on the surface of the And (3) a setting coefficient measurement formula:
from the following components
And (3) export:
Q KTi =KQ Ti
V n actual grouting total amount measured in n sampling periods, K-setting constant, T-sampling period, such as 0.5s,2s Q Ti -ith periodic effective flow; q (Q) KTi -effective flow Q corresponding to the ith period Ti Effective flow rate is set.
Sixth, judge and set the effective flow Q Tki Whether or not it is at the periodic design flow rate Q dT Allowable deviation AD of (a) QT Within the range; specifically, to set the effective flow rate Q KTi Subtracting the period design flow Q dT Obtaining a difference D KQ The difference D is KQ And cycle design flow Q dT Allowable deviation AD of (a) QT Comparing when the difference D KQ At the allowable deviation AD QT When the range is in the range, the current grouting meets the requirement, and the period effective frequency F of the grouting motor is maintained Ti The frequency of the grouting motor is unchanged, and the sampling and calculation judgment of the next sampling period are continued; when the difference D KQ Beyond the allowable deviation AD QT In the range, at presentPeriod effective frequency F of grouting motor Ti Adjusting the frequency of the grouting motor for an initial value, i.e. adjusting the effective frequency F of the period Ti : if the difference D KQ Greater than allowable deviation AD QT Upper limit of the range, the period effective frequency F is reduced Ti If the difference D KQ Beyond the allowable deviation AD QT The lower limit of the range increases the period effective frequency F Ti ；
The method for adjusting the frequency comprises the following steps: firstly, setting preset equiamount frequency, and according to the preset equiamount frequency, setting the period effective frequency F of the current grouting motor Ti Stepwise decreasing or increasing is performed and performed once in one sampling period T. The preset equifrequency is a fixed frequency value or is multiplied by the effective frequency F of the grouting motor period according to a preset percentage Ti Preferably, the fixed frequency value is 1.+ -. 1Hz and the predetermined percentage is 2.+ -. 1%.
At the periodic effective frequency F of the grouting motor Ti After one time of adjustment, continuing to sample and calculate and judge the next sampling period;
with this circulation, until stopping the slip casting, in cyclic process, along with the change of pipeline flow, can be automatic, quick feedback control, realize the accurate output of cement paste pipeline flow, real-time, right amount and even with the cement paste transport entering to consolidate the soil body.
In one embodiment, the density of the grouting slurry is also considered, and the actual pile body is deviated from the designed ash amount due to the fact that the grouting slurry is not completely consistent with the design requirement when the grouting slurry is prepared manually, so as to reduce the deviation and set the effective flow rate Q Tki Based on the method, the density of grouting slurry is obtained by collecting the pulping parameters, and the flow is corrected again according to the density of grouting slurry;
specifically, when judging to set the effective flow rate Q Tki At a periodic design flow rate Q dT Allowable deviation AD of (a) QT When the range is in, the density of the grouting slurry is obtained, the correction flow is calculated according to the density feedback, the frequency of the grouting motor is adjusted through the correction flow, and the deviation AD is calculated QT Setting effective flow rate Q in range KTi AdjustingA section for adjusting the regulated effective flow Q KTi The actual flow meeting the requirements is collected to control the ash mixing amount of the pile body.
In the process of obtaining the density of grouting slurry, the application provides two schemes, namely, directly measuring the density of grouting slurry in a slurry tank and measuring the density of grouting slurry in a grouting pipeline.
Referring to fig. 2, based on the acquisition of the density of grouting slurry in the direct measurement slurry tank, the following steps are adopted to control the ash mixing amount of the pile body:
firstly, designing a water-cement ratio R d Based on the raw materials, different design water-cement ratios R are adopted according to the material mixing requirements d Preparing trial slurry, measuring the corresponding density, drawing a relation curve of water-cement ratio and slurry density, referring to FIG. 4, fitting to obtain a relation formula of water-cement ratio and slurry density, and designing a water-cement ratio R d The density in the corresponding "cement ratio-slurry density relation" is the design density ρ d ；
Setting the design density ρ d Allowable deviation AD of (a) ρ And setting the design density ρ d Is a correction limit value LD of (1) ρ ；
According to the design water-cement ratio R in the current construction requirement d Preparing grouting slurry, namely, grouting slurry in a slurry tank, collecting the current water adding amount L1, the current cement amount L2, the current additive A amount L3 and the current additive B amount L4 of the grouting slurry, obtaining the parameters according to actual values generated during construction of workers, and calculating the current water-cement ratio R on ；
The current water-cement ratio R on Substituting into the relation formula of the water-cement ratio and the slurry density to obtain the current density rho On The method comprises the steps of carrying out a first treatment on the surface of the Calculating the current density ρ On And design density ρ d Is the difference D of (2) ρ ；
When the difference D ρ Beyond the allowable deviation AD ρ Range, and current density ρ on At the correction limit LD ρ In the range, at the current density ρ on Calculating a corresponding density correction flow Q based on ρ The method comprises the steps of carrying out a first treatment on the surface of the When the difference D ρ Beyond the allowable deviation AD ρ RangeAnd the current density ρ on Exceeding correction limit LD ρ At the time, the limit LD is corrected ρ Calculating a corresponding density correction flow Q based on ρ Correction limit LD ρ The range is divided into a range section, and thus, when the range section is smaller than the lower limit value, the lower limit value is used as a basis, and when the range section is higher than the upper limit value, the upper limit value is used as a basis. Correcting flow rate Q according to density ρ Adjusting the frequency of the grouting motor, i.e. the effective periodic frequency F Ti The method comprises the steps of carrying out a first treatment on the surface of the When the current density ρ on And design density ρ d Is the difference D of (2) ρ At the allowable deviation AD ρ When the range is in, the frequency of the grouting motor is not adjusted, namely the effective flow Q is set Tki No change occurs.
Calculating the Density correction flow Q ρ The formula of (2) is:the method comprises the steps of carrying out a first treatment on the surface of the When the difference D ρ Beyond the allowable deviation AD ρ When the range is in the range, the system sends out a density overrun alarm signal for warning whether the problem of wrong configuration of grouting slurry exists or not, and the current density rho on Exceeding correction limit LD ρ When in range, the system can also send out a density correction flow overrun alarm signal.
The effective flow rate Q can be further regulated by measuring the density of grouting slurry in the slurry tank Tki The grouting quantity is adjusted, so that the actual ash mixing quantity of the pile body meets the design requirement while the grouting quantity meets the requirement, and the grouting precision and quality are further improved.
Referring to fig. 3, the density of grouting slurry in a grouting pipeline is adjusted based on measurement, the grouting slurry in the grouting pipeline is directly and real-timely collected by a densimeter, the density of the grouting slurry is obtained and is used for controlling the ash mixing amount of a pile body, the density of grouting slurry in the grouting pipeline is measured more accurately, the problem of density change during slurry outlet caused by external interference is avoided, and the ash mixing amount of the pile body is controlled by adopting the following steps:
to design the water-cement ratio R d Based on the raw materials, different design water-cement ratios R are adopted according to the material mixing requirements d Preparing trial slurry and measuring the density of the corresponding trial slurryDrawing a relation curve of water-cement ratio and slurry density, fitting to obtain a relation formula of water-cement ratio and slurry density, and designing a water-cement ratio R d The density in the corresponding "cement ratio-slurry density relation" is the design density ρ d Reference is made to fig. 4.
Setting the design density ρ d Allowable deviation AD of (a) ρ And setting the design density ρ d Is a correction limit value LD of (1) ρ ；
The instantaneous density ρ of the signal is measured for the densitometer in one sampling period T by a sampling data filtering algorithm i Continuously sampling m times at intervals, taking arithmetic average to obtain effective density in current sampling period T, and recording as effective density ρ of pipeline period Ti ；
Calibrating the pipeline cycle effective density ρ Ti Measuring the effective density correction coefficient lambda of the pipe period, lambda=design density ρ d According to the designed water-cement ratio R d Period effective density ρ during pulping Ti And calculate the effective density ρ of the pipe correction λTi The method comprises the steps of carrying out a first treatment on the surface of the Subsequently calculate the pipeline correction effective density ρ λTi And design density ρ d Is the difference D of (2) λρ ；
When the difference D λρ Beyond the allowable deviation AD ρ Range and pipeline correction effective density ρ λTi Greater than or equal to correction limit LD ρ When the effective density rho is corrected by the pipeline λTi Calculating the corresponding pipeline density correction flow Q based on the calculation λTi The method comprises the steps of carrying out a first treatment on the surface of the When the difference D λρ Beyond the allowable deviation AD ρ Range and pipeline correction effective density ρ λTi Exceeding correction limit LD ρ At the time, the limit LD is corrected ρ Calculating the corresponding pipeline density correction flow Q based on the calculation λTi The method comprises the steps of carrying out a first treatment on the surface of the Correcting flow Q based on pipeline density λTi Correction limit LD ρ The range is divided into a range section, and thus, when the range section is smaller than the lower limit value, the lower limit value is used as a basis, and when the range section is higher than the upper limit value, the upper limit value is used as a basis. Adjusting the frequency of the grouting motor, i.e. the effective periodic frequency F Ti The method comprises the steps of carrying out a first treatment on the surface of the When the difference D λρ At the allowable deviation AD ρ When the frequency of the grouting motor is within the range, the frequency of the grouting motor is not regulatedSetting, i.e. setting, the effective flow rate Q Tki No change occurs.
The pipeline density correction flow Q corresponding to the calculation λTi When the effective density rho is corrected by the pipeline λTi Substituting the relation formula of the water-cement ratio and the slurry density to calculate the current water-cement ratio R on The method comprises the steps of carrying out a first treatment on the surface of the And calculating the pipeline density correction flow through a formula:
；
when the difference D λρ Beyond the allowable deviation AD ρ When the grouting slurry is in the range, the system sends out a density overrun alarm signal for warning whether the grouting slurry is wrong in configuration. The above-mentioned allowable deviation AD QT For a fixed value interval [ Q ] α ,Q β ]Preferably [ -0.035,0.035]Or to design flow rate Q by multiplying a predetermined percentage by a period dT Preferably [ - ρ α =-ρ d ×2%，ρ β =ρ d ×2%]。
The density change of grouting slurry in the grouting pipeline can be accurately measured in real time, so that the effective flow Q can be further regulated Tki The grouting quantity is adjusted, so that the actual ash mixing quantity of the pile body meets the design requirement while the grouting quantity meets the requirement, and the grouting precision and quality are further improved. In addition, in the correction process, the density of the grouting slurry in the slurry tank is not affected by the change of the density of the grouting slurry in the slurry tank, so that the density of the grouting slurry in the slurry tank is not required to be measured again when new grouting slurry is added into the slurry tank, the intelligent degree is higher, and the operation is more convenient.
The above-described embodiments are merely preferred embodiments for fully explaining the present invention, and the scope of the present invention is not limited thereto. Equivalent substitutions and modifications will occur to those skilled in the art based on the present invention, and are intended to be within the scope of the present invention. The protection scope of the invention is subject to the claims.
Claims (6)
1. The constant-flow grouting control method for the cement-soil mixing pile is characterized by comprising the following steps of:
the first step, according to the design index, determining the design flow Q through calculation d The method comprises the steps of carrying out a first treatment on the surface of the Design indexes comprise ash mixing amount, water-ash ratio and lifting or dropping speed of guniting;
setting a sampling period T, and calculating a period design flow Q in the sampling period T dT ；
Thirdly, setting sampling times m in a sampling period T; setting a period design flow rate Q dT Allowable deviation AD of (a) QT The method comprises the steps of carrying out a first treatment on the surface of the Allowable deviation AD QT For a fixed value interval [ Q ] α ,Q β ]Or to design flow rate Q by multiplying a predetermined percentage by a period dT Is calculated for the obtained value interval;
fourth, through sampling data filtering algorithm, in one sampling period T, the instantaneous flow q of the measurement signal of the flow rate is measured i Sampling at intervals of m times continuously, and taking arithmetic average to obtain periodic effective flow Q Ti Collecting the frequency of the corresponding grouting motor, and recording the frequency as the period effective frequency F Ti ；
Fifth step, the effective flow Q of the calibration period Ti Measuring a setting constant K, and calculating to obtain a setting effective flow Q KTi ；
Sixth, judge and set the effective flow Q KTi Whether or not it is at the periodic design flow rate Q dT Allowable deviation AD of (a) QT Within the range;
if not, the current period effective frequency F of the grouting motor is used Ti Adjusting the frequency of the grouting motor for the initial value; the frequency adjustment method of the grouting motor comprises the following steps: setting preset equiamount frequency, and setting the effective frequency F of the current grouting motor period according to the preset equiamount frequency Ti Stepwise decreasing or increasing is performed and is performed once in one sampling period T; the preset equifrequency is a fixed frequency value or is multiplied by the effective frequency F of the grouting motor period according to a preset percentage Ti Is calculated as a result of the calculation of (a);
if yes, the effective flow Q is set KTi Is collected as the actual flow meeting the requirement and maintains the periodic effective frequency F of the grouting motor Ti Unchanged, entering the next step;
step seven, jumping to the fourth step to enter the next sampling period T; and (5) until grouting is finished.
2. The method for constant flow grouting control of soil cement mixing pile according to claim 1, wherein in the sixth step, when judging the setting effective flow Q KTi At a periodic design flow rate Q dT Allowable deviation AD of (a) QT When the range is in, the density of grouting slurry is obtained, and the effective flow Q is regulated by adjusting the frequency of the grouting motor according to the density feedback KTi Adjusting, and setting the adjusted effective flow Q KTi The actual flow meeting the requirements is collected to control the ash mixing amount of the pile body.
3. The constant flow grouting control method of the cement-soil mixing pile according to claim 2, wherein the density of grouting slurry is obtained by collecting grouting parameters, and the ash mixing amount of the pile body is controlled by adopting the following steps:
A. to design the water-cement ratio R d Based on the raw materials, different design water-cement ratios R are adopted according to the material mixing requirements d Preparing trial slurry, measuring the corresponding density, drawing a relation curve of water-cement ratio and slurry density, fitting to obtain a relation formula of water-cement ratio and slurry density, and designing a water-cement ratio R d The density in the corresponding "cement ratio-slurry density relation" is the design density ρ d ；
B. Setting the design density ρ d Allowable deviation AD of (a) ρ And setting the design density ρ d Is a correction limit value LD of (1) ρ ；
C. According to the design water-cement ratio R in the current construction requirement d Preparing grouting slurry, collecting current water adding amount L1, current cement amount L2, current additive A amount L3 and current additive B amount L4 of the grouting slurry, and calculating current water-cement ratio R on ；
D. The current water-cement ratio R on Substituting into the relation formula of the water-cement ratio and the slurry density to obtain the current density rho on ；
E. Calculating the current density ρ on And design density ρ d Is the difference D of (2) ρ ；
F. When the difference D ρ Beyond the allowable deviation AD ρ Range, and current density ρ on At the correction limit LD ρ In the range, at the current density ρ on Calculating a corresponding density correction flow Q based on ρ The method comprises the steps of carrying out a first treatment on the surface of the When the difference D ρ Beyond the allowable deviation AD ρ Range, and current density ρ on Exceeding correction limit LD ρ At the time, the limit LD is corrected ρ Calculating a corresponding density correction flow Q based on ρ The method comprises the steps of carrying out a first treatment on the surface of the Correcting flow rate Q according to density ρ Adjusting the frequency of the grouting motor;
when the current density ρ on And design density ρ d Is the difference D of (2) ρ At the allowable deviation AD ρ When the frequency of the grouting motor is in the range, the frequency of the grouting motor is not adjusted.
4. The method for constant flow grouting control of cement-soil mixing pile according to claim 3, wherein the density correction flow Q is calculated ρ The formula of (2) is:；
when the difference D ρ Beyond the allowable deviation AD ρ When the density is in the range, the system sends out a density overrun alarm signal, when the current density rho on Exceeding correction limit LD ρ And when the range is in the range, the system sends out a density correction flow overrun alarm signal.
5. The constant flow grouting control method of the cement-soil mixing pile according to claim 2, wherein grouting slurry in a grouting pipeline is collected through a densimeter to obtain the density of the grouting slurry, and the ash mixing amount of the pile body is controlled by adopting the following steps:
A. to design the water-cement ratio R d Based on the raw materials, different design water-cement ratios R are adopted according to the material mixing requirements d Preparing trial slurry, measuring the density of the corresponding trial slurry, and drawing a relation curve of water-cement ratio and slurry density"and fitting to obtain a relation formula of water-cement ratio-slurry density, and designing a water-cement ratio R d The density in the corresponding "cement ratio-slurry density relation" is the design density ρ d ；
B. Setting the design density ρ d Allowable deviation AD of (a) ρ And setting the design density ρ d Is a correction limit value LD of (1) ρ ；
C. The instantaneous density ρ of the signal is measured for the densitometer in one sampling period T by a sampling data filtering algorithm i Continuously sampling m times at intervals, taking arithmetic average to obtain effective density in current sampling period T, and recording as effective density ρ of pipeline period Ti ；
D. Calibrating the pipeline cycle effective density ρ Ti Measuring the effective density correction coefficient lambda of the pipeline period, and calculating to obtain the effective density rho of the pipeline correction λTi ；
E. Calculating the effective density ρ of the pipeline correction λTi And design density ρ d Is the difference D of (2) λρ ；
F. When the difference D λρ Beyond the allowable deviation AD ρ Range, and when the pipeline corrects for effective density ρ λTi At the correction limit LD ρ Within the range, correct the effective density ρ with the pipeline λTi Calculating the corresponding pipeline density correction flow Q based on the calculation λTi The method comprises the steps of carrying out a first treatment on the surface of the When the difference D λρ Beyond the allowable deviation AD ρ Range, and when the pipeline corrects for effective density ρ λTi Exceeding correction limit LD ρ At the time, the limit LD is corrected ρ Calculating the corresponding pipeline density correction flow Q based on the calculation λTi The method comprises the steps of carrying out a first treatment on the surface of the Correcting flow Q based on pipeline density λTi Adjusting the frequency of the grouting motor;
when the difference D λρ At the allowable deviation AD ρ When the frequency of the grouting motor is in the range, the frequency of the grouting motor is not adjusted.
6. The method for constant flow grouting control of a soil cement stirring pile according to claim 5, wherein the corresponding Q is calculated λTi ：
The effective density ρ of the pipeline is corrected first λTi Substituting the relation formula of the water-cement ratio and the slurry density to calculate the current water-cement ratio R on ；
Calculating the pipeline density correction flow through a formula；
When the difference D λρ Beyond the allowable deviation AD ρ When the range is over, the system sends out a density overrun alarm signal, and when the effective density rho is corrected by the pipeline λTi Exceeding correction limit LD ρ And when the range is in the range, the system sends out an over-limit alarm signal for correcting the flow of the pipeline density.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101831909A (en) * | 2010-05-11 | 2010-09-15 | 河海大学 | Cement mixing pile construction slurry flow real-time control device |
| CN103031809A (en) * | 2011-09-29 | 2013-04-10 | 李跃军 | Prestress hole channel grouting quality control method based on double parameters of flow and density |
| CN105113499A (en) * | 2015-10-23 | 2015-12-02 | 河海大学 | Test system and method for detecting cement content of pile body of cement stirring pile in real time |
| CN107246269A (en) * | 2017-07-13 | 2017-10-13 | 合肥引力波数据科技有限公司 | A kind of tunnel shield-tunneling construction and its data collecting system |
| CN114840044A (en) * | 2022-05-10 | 2022-08-02 | 浙江坤德创新岩土工程有限公司 | Intelligent pulping and pulp supplying control device and using method thereof |
| CN115898845A (en) * | 2022-12-08 | 2023-04-04 | 刘倩倩 | Large-proportion double-liquid grouting automatic control system |
-
2023
- 2023-11-06 CN CN202311461346.7A patent/CN117188469B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101831909A (en) * | 2010-05-11 | 2010-09-15 | 河海大学 | Cement mixing pile construction slurry flow real-time control device |
| CN103031809A (en) * | 2011-09-29 | 2013-04-10 | 李跃军 | Prestress hole channel grouting quality control method based on double parameters of flow and density |
| CN105113499A (en) * | 2015-10-23 | 2015-12-02 | 河海大学 | Test system and method for detecting cement content of pile body of cement stirring pile in real time |
| CN107246269A (en) * | 2017-07-13 | 2017-10-13 | 合肥引力波数据科技有限公司 | A kind of tunnel shield-tunneling construction and its data collecting system |
| CN114840044A (en) * | 2022-05-10 | 2022-08-02 | 浙江坤德创新岩土工程有限公司 | Intelligent pulping and pulp supplying control device and using method thereof |
| CN115898845A (en) * | 2022-12-08 | 2023-04-04 | 刘倩倩 | Large-proportion double-liquid grouting automatic control system |
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