CN115762076A - Concrete diaphragm wall pouring process control and early warning system and method - Google Patents
Concrete diaphragm wall pouring process control and early warning system and method Download PDFInfo
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Abstract
The invention discloses a concrete impervious wall pouring process control and early warning system and a method, wherein the system comprises a controller, a concrete liquid level detector, a display and an alarm, wherein the concrete liquid level detector is communicated with the controller and is used for detecting the liquid level height of concrete of a distributing hopper, the display and the alarm are used for displaying data in the concrete impervious wall pouring process, the alarm is used for early warning that the total concrete pouring time and the accumulated pouring pause time are about to reach the upper limit, and a timer, a counter and a processor are arranged in the controller; the processor collects the signals of the concrete liquid level detector, outputs the signals to control the work of the timer, the counter and the alarm, and outputs the height value of the concrete liquid level of the distributing hopper, the continuous pouring time, the pouring pause time and the pouring times of the distributing hopper to the display for displaying. The invention realizes the analysis and early warning of the total concrete pouring time, the real-time concrete pouring elevation of the groove section and the pouring pause time, thereby realizing the in-situ control of the concrete pouring process.
Description
Technical Field
The invention relates to the field of pouring of concrete impervious walls, in particular to a management and control and early warning system and method for a pouring process of a concrete impervious wall.
Background
The concrete impervious wall is an important means for foundation treatment of the current water conservancy and hydropower engineering, and is an important measure for engineering seepage prevention particularly when a dam is built on a deep covering layer. At present, the impervious wall of each project reaches more than 100 meters. The construction quality of the impervious wall is directly related to the operation safety and the engineering benefit of the engineering, however, the construction of the impervious wall belongs to hidden engineering and is difficult to control the construction process by adopting an intuitive means. The concrete pouring process is a core link of the diaphragm wall construction process, however, the current concrete pouring process mainly adopts a manual control mode, the concrete pouring speed and the pipe pulling speed are mainly controlled according to construction experience, the problems of mud clamping, cold joint and the like are easily caused, and the pouring speed is difficult to accurately control. Therefore, it is necessary to research an intelligent and dynamic feedback-integrated concrete cut-off wall pouring process monitoring method to realize in-situ analysis and feedback control of the concrete cut-off wall pouring process, which has very important significance in ensuring the cut-off wall construction quality, improving the first-time qualified rate of the cut-off wall construction quality, improving the concrete cut-off wall construction efficiency and ensuring the seepage safety of the hydraulic and hydro-power engineering.
At present, the construction quality of the concrete impervious wall is mainly controlled in the process of combining design indexes and controlling partial parameters, for example, CN113062324A discloses a concrete type selection and pouring process control method for the concrete pouring process of the impervious wall, so as to prevent the problem of initial setting of the top surface of the concrete; "discussing how to control the construction quality of the plastic concrete impervious wall" compiled by the Ministry of Ministry, which is published in the Low carbon world of 2021, analyzes the control key points of the construction process of the plastic impervious wall and the important measures of the construction quality control; CN111042061B discloses a construction method of an ultra-deep impervious wall, which discusses the grooving process, the hole cleaning process and the concrete pouring process in detail and realizes the construction of the impervious wall in a deep covering layer with the deepest depth of more than 180 meters, and the like; the 'technology for forming grooves by grab buckets for ultra-deep cut-off wall construction steel wire ropes in shallow-out high-altitude areas' edited by Liudianzhong et al is published in 'Sichuan water conservancy' in 2020 edition, and summarizes the construction experience of the grab bucket grooving method for the water conservancy cut-off wall engineering steel wire ropes in Tibet high-altitude areas with extremely complicated geological conditions. However, the above measures are mainly to design the body type of the concrete cut-off wall and to control the construction process by combining the construction experience, and no research has been made on analyzing and feedback controlling the actual construction state of the concrete cut-off wall.
Aiming at the aspect of concrete impervious wall pouring process control, the 'shallow analysis of concrete impervious wall pouring quality control' compiled by castanea henryi and the like 2011 is published in the northwest hydropower, and the text explains the quality control measures of concrete impervious wall pouring from the aspects of pouring time, conduit configuration and arrangement, pouring process and the like; : CN105155545A discloses a method for fixing a guide pipe by using a fixed guide pipe device aiming at the process of pouring an impervious wall groove section; CN112627246A discloses an intelligent analysis method for concrete filling effect by analyzing dielectric constant of substances in a tank by using a resistivity method;
CN113062324A discloses a novel impervious wall concrete pouring method. However, no analysis method aiming at the concrete pouring time exists in the existing research, the real-time feedback of the concrete pouring process parameters of the impervious wall is difficult to realize, and the construction quality analysis effect is reduced.
In summary, in the existing research aiming at the concrete pouring quality control method of the diaphragm wall of the hydraulic and hydroelectric engineering, the existing research mainly adopts a field manual control mode for control, so that the in-situ control of the construction process of the concrete diaphragm wall is difficult to realize, and the construction quality control effect is reduced.
Disclosure of Invention
The invention provides a concrete impervious wall pouring process control and early warning system and method for solving the technical problems in the prior art.
The technical scheme adopted by the invention for solving the technical problems in the prior art is as follows: a concrete diaphragm wall pouring process control and early warning system comprises a controller, a concrete liquid level detector, a display and an alarm, wherein the concrete liquid level detector, the display and the alarm are all communicated with the controller;
the concrete liquid level detector is used for detecting the height of the concrete liquid level of the distributing hopper;
the timer is used for timing the continuous pouring time and the pouring intermittent time of the concrete;
the counter is used for accumulating the pouring times of the branch hopper;
the display is used for displaying data of the concrete impervious wall pouring process;
the alarm is used for early warning that the total concrete pouring time and the accumulated pouring pause time are about to reach the upper limit;
the processor collects signals of the concrete liquid level detector, outputs the signals to control the work of the timer, the counter and the alarm, and outputs the height value of the concrete liquid level of the distributing hopper, the continuous pouring time, the pouring intermittent time and the pouring times of the distributing hopper to the display for displaying.
Further, the concrete liquid level detector comprises a distance measuring sensor.
Furthermore, the distance measuring sensor is an infrared distance measuring sensor or a laser distance measuring sensor.
Further, the controller is a programmable controller.
Further, the display is a human-machine interface.
The controller outputs the height value of the concrete level of the distributing hopper, the continuous pouring time, the pouring intermittent time and the pouring times of the distributing hopper to the upper computer, and the upper computer analyzes and processes the input signals and sends the processed signals to the controller.
The invention also provides a concrete diaphragm wall pouring process control and early warning method, which is provided with a controller, a concrete liquid level detector, a display and an alarm, wherein the concrete liquid level detector, the display and the alarm are all communicated with the controller;
a concrete liquid level detector is adopted to detect the height of the concrete liquid level of the distributing hopper;
timing the continuous pouring time and the pouring intermittent time of the concrete by using a timer;
the pouring times of the distributing hopper are accumulated by adopting a counter;
displaying data of the concrete impervious wall pouring process by using a display;
an alarm is adopted to early warn that the total concrete pouring time and the accumulated pouring pause time are about to reach the upper limit;
the processor is used for collecting signals of the concrete liquid level detector, outputting the signals to control the work of the timer, the counter and the alarm, and outputting the height value of the concrete liquid level of the distributing hopper, the continuous pouring time, the pouring intermittent time and the pouring times of the distributing hopper to the display for displaying.
Further, the method comprises the following steps:
step A, mounting a concrete liquid level detector on a concrete distributing hopper, and acquiring signals of the concrete liquid level detector by a controller to obtain a concrete liquid level height time sequence in the distributing hopper;
step B, setting the concrete liquid level height to be H when the material distributing hopper is empty 0 When the hopper is full, the concrete level is H f (ii) a The controller compares the time sequence of the concrete liquid level height, when the concrete liquid level height of the material distributing hopper is from H 0 When the concrete begins to gradually increase, judging that the current time is the concrete pouring starting time; when the concrete liquid level of the material distributing hopper is changed from H f When the concrete begins to gradually decrease, the concrete pouring time is the time for beginning to pour the concrete; when the concrete liquid level of the hopper is changed from H f Down to H 0 Then, the pouring completion time is the pouring completion time; when the concrete liquid level of the material separating hopper is changed from H 0 To H f From H f Down to H 0 When the counter is started, the counter is increased by 1; when the continuously measured variable quantity of the concrete liquid level height is lower than a set threshold value, considering that the concrete pouring is suspended in the period;
step C, calculating by the controller according to the depth of the groove section and the required minimum concrete rising speed to obtain the maximum value of the total concrete pouring time; the timer starts to time from the pouring starting time, the current pouring time is calculated in real time, when the pouring time is more than or equal to 90% of the maximum value of the total pouring time, the controller outputs a total pouring time early warning signal to the alarm and the display, and the alarm sends out the total pouring time early warning signal;
step D, obtaining real-time groove entering concrete volume according to the groove entering starting time, the groove entering finishing time, the counting value of the counter and the concrete volume of the branch hopper; according to the structure of the impervious wall groove body, the real-time concrete pouring height in the groove body is obtained;
and E, accumulating the pouring pause time length, comparing the accumulated pouring pause time length with the required maximum allowable pouring pause time length, outputting a pouring pause accumulated time length early warning signal to an alarm and a display by the controller when the pouring pause accumulated time length is more than or equal to 90% of the maximum allowable pouring pause time length, and sending out the pouring pause accumulated time length early warning signal by the alarm.
Further, an upper computer is arranged, so that the controller sends the height value of the concrete level of the distributing hopper, the continuous pouring time, the pouring intermittent time and the pouring times of the distributing hopper to the upper computer, and a concrete total pouring time early warning model, a concrete pouring height analysis model in the groove section and a concrete pouring pause time early warning model are established in the upper computer; and tracking the real-time concrete pouring height, the total pouring time and the pouring pause accumulated time in the groove body in real time through the model.
Further, the method for establishing the concrete total pouring time early warning model, the concrete pouring height analysis model in the groove section and the concrete pouring pause time early warning model in the upper computer comprises the following steps:
step 1: enabling a controller to collect a concrete liquid level height time sequence H, H = (H, t) in a distribution hopper according to the same sampling time interval, and sending the concrete liquid level height time sequence H, H = (H, t) to an upper computer, wherein H is a height value, and t is a sampling time;
step 2: and setting delta t as a liquid level measurement time interval, and analyzing and calculating the concrete pouring starting time, the concrete pouring starting time of each tank, the concrete pouring ending time and the concrete pouring interruption time by the upper computer on the basis of H as follows:
setting the initial time as 0, wherein no material exists in the hopper at this time, h (0) is the initial height value of the concrete liquid level, and calculating the pouring starting time of the first tank of concrete according to the following formula:
h(t+(c+1)Δt)-h(t+cΔt)>h s (1)
T s ＝t (2)
in the formula, delta t is a liquid level measurement time interval; c =1,2,3 t ，c t The number of sampling times at the moment t is; h is s The method comprises the following steps of (1) setting a liquid level difference threshold value of two adjacent sampling; when c is continuous t The difference of the liquid level heights of two times of adjacent sampling is larger than the threshold value h s When the concrete is discharged, the concrete is considered to be discharged into the material distributing hopper from the interior of the concrete transport vehicle; t is s Beginning pouring time;
and (3) calculating the current discharging end time of the ith tank and the concrete starting time of the next tank according to the following formula:
h(t+cΔt)-h(t+(c+1)Δt)>h s (3)
wherein
When the concrete pouring of the ith tank is finished, when the negative value of the difference of the liquid level heights of two consecutive samples is more than a threshold value h s Then the concrete pouring of the tank is finished;
c is the smallest positive integer satisfying formula (5) s The minimum value of the rise of the liquid level is measured twice;
represents the intermediate time interval from the end of the ith tank to the start of the (i + 1) th tank;
the concrete placement pause time is calculated according to the following formula:
h(t+(c p +1)Δt)＝h(t+c p Δt) (7)
T p for the time of pause, show in
If the concrete liquid level does not change in the time period, the concrete pouring is suspended in the time period;
and step 3: establishing a concrete pouring total duration early warning model as shown in the following formula:
T a ＝D/v (9)
T b ＝T-T s (10)
T a -T b <T w (11)
where D is the groove section depth, v is the minimum rise velocity for the design requirement hour, T s For the start of casting, T is the current time, T b For the poured time, T a The maximum allowable pouring time; when T is a And T b The difference between them is less than threshold T w ，T w >0, carrying out early warning on the total pouring time;
and 4, step 4: establishing a concrete pouring height analysis model in the cut-off wall groove section as shown in the following formula:
wherein V n The volume of the concrete in the nth tank, m is the total number of tanks, d is the casting height in the groove section, A d The area of the horizontal section of the groove section at the height of d;V m the concrete volume is real-time entering the tank;
and 5: establishing a concrete pouring pause time analysis model shown as the following formula:
wherein
Early warning threshold value T for concrete pouring pause duration p And when the concrete pouring pause duration exceeds a threshold value, early warning is carried out.
The invention has the advantages and positive effects that: according to the method, the concrete liquid level height in the concrete pouring process is monitored, so that the analysis of the concrete pouring starting time, the concrete pouring starting and pouring completion time of each tank and the concrete pouring pause time is realized, the analysis and early warning of the total concrete pouring time, the real-time concrete pouring elevation of the groove section and the pouring pause time are further realized, the in-process control of the concrete pouring process is realized, the adverse phenomena of cold joint, top layer solidification and the like of the concrete impervious wall are prevented, and the concrete pouring quality is effectively ensured. The method can control the construction process in the concrete cut-off wall pouring stage, realize the in-situ analysis and feedback control of the construction process, solve the problem that the real-time feedback in the concrete pouring process is difficult to realize in the traditional method, and realize the change of the construction quality of the concrete cut-off wall from the post control to the in-situ control.
Drawings
Fig. 1 is a schematic structural view of a concrete diaphragm wall pouring process control and early warning system of the invention.
Fig. 2 is a schematic view of the working flow of the management and control and early warning method for the pouring process of the concrete diaphragm wall.
Detailed Description
For further understanding of the contents, features and effects of the present invention, the following embodiments are enumerated in conjunction with the accompanying drawings, and the following detailed description is given:
referring to fig. 1 to 2, a concrete diaphragm wall casting process control and early warning system includes a controller, a concrete liquid level detector, a display and an alarm, all of which are in communication with the controller, wherein a timer, a counter and a processor are arranged in the controller;
the concrete liquid level detector is used for detecting the height of the concrete liquid level of the distributing hopper;
the timer is used for timing the concrete continuous pouring time and the pouring intermittent time;
the counter is used for accumulating the pouring times of the branch hopper;
the display is used for displaying data of the concrete impervious wall pouring process;
the alarm is used for early warning that the total concrete pouring time and the accumulated pouring pause time are about to reach the upper limit;
the processor collects the signals of the concrete liquid level detector, outputs the signals to control the work of the timer, the counter and the alarm, and outputs the height value of the concrete liquid level of the distributing hopper, the continuous pouring time, the pouring pause time and the pouring times of the distributing hopper to the display for displaying.
Preferably, the concrete level detector may comprise a distance measuring sensor.
The distance measuring sensor can be installed at the top of the distributing hopper or above the distributing hopper, a measuring reference surface is taken at the top of the distributing hopper, and the height between the measuring reference surface at the top of the distributing hopper and the bottom of the distributing hopper is a fixed value, so that the liquid level height of the concrete liquid level of the distributing hopper relative to the bottom of the distributing hopper is obtained by detecting the height difference between the concrete liquid level height of the distributing hopper and the top reference surface height of the distributing hopper. Other concrete level detectors can be installed according to the working principle and the specification.
Preferably, the ranging sensor may be an infrared ranging sensor or a laser ranging sensor.
Preferably, the controller may be a programmable controller.
Preferably, the display may be a human machine interface.
Preferably, the alarm can be an audible and visual alarm, and the total concrete pouring time and the accumulated pouring pause time can be early warned to reach the upper limit through lights or sounds with different colors.
Preferably, the system also comprises an upper computer, the controller outputs the height value of the concrete level of the distributing hopper, the continuous casting time, the casting pause time and the casting times of the distributing hopper to the upper computer, and the upper computer analyzes and processes the input signals and sends the signals to the controller after processing.
The invention also provides a concrete diaphragm wall pouring process control and early warning method, which is characterized in that a controller, a concrete liquid level detector, a display and an alarm are arranged, wherein the concrete liquid level detector, the display and the alarm are all communicated with the controller, and a timer, a counter and a processor are arranged in the controller;
detecting the height of the concrete liquid level of the distributing hopper by adopting a concrete liquid level detector;
timing the continuous pouring time and the pouring intermittent time of the concrete by using a timer;
the pouring times of the distributing hopper are accumulated by adopting a counter;
displaying data of the concrete impervious wall pouring process by using a display;
early warning that the total pouring time length of the concrete and the accumulated pouring pause time length are about to reach the upper limit by adopting an alarm;
the processor is adopted to collect the signal of the concrete liquid level detector, output the signal to control the work of the timer, the counter and the alarm, and output the height value of the concrete liquid level of the distributing hopper, the continuous pouring time, the pouring intermittent time and the pouring times of the distributing hopper to the display for displaying.
Preferably, the method may comprise the steps of:
step 1, a concrete liquid level detector can be installed on a concrete distributing hopper, a controller collects signals of the concrete liquid level detector, and a concrete liquid level height time sequence in the distributing hopper can be obtained;
step 2, the concrete liquid level height can be set to be H when the material distributing hopper is empty 0 The concrete level is H when the hopper is full f (ii) a The controller compares the time sequence of the concrete liquid level height whenThe height of the concrete liquid level of the distributing hopper is H 0 When the concrete begins to gradually increase, judging that the current time is the concrete pouring starting time; when the concrete liquid level of the material separating hopper is changed from H f When the concrete begins to gradually decrease, the time for pouring the concrete is the beginning time; when the concrete liquid level of the hopper is changed from H f Down to H 0 Then, the pouring completion time is the pouring completion time; when the concrete liquid level of the material separating hopper is changed from H 0 To H f From H f Down to H 0 When the counter is 1, the counter is increased; when the continuously measured variable quantity of the concrete liquid level height is lower than a set threshold value, considering that the concrete pouring is suspended in the period;
step 3, the controller can calculate and obtain the maximum value of the total concrete pouring time according to the depth of the groove section and the required minimum concrete rising speed; the timer starts timing from the pouring starting time, the current pouring time is calculated in real time, when the pouring time is more than or equal to 90% of the maximum value of the total pouring time, the controller outputs a total pouring time early warning signal to the alarm and the display, and the alarm sends out the total pouring time early warning signal;
step 4, obtaining real-time concrete volume of the feeding hopper according to the concrete feeding starting time, the concrete feeding completion time, the counting value of the counter and the concrete volume of the feeding hopper; the real-time concrete pouring height in the groove body can be obtained according to the structure of the groove body of the impervious wall;
and 5, accumulating the pouring pause time length, comparing the accumulated pouring pause time length with the required maximum allowable pouring pause time length, outputting a pouring pause accumulated time length early warning signal to an alarm and a display by the controller when the pouring pause accumulated time length is more than or equal to 90% of the maximum allowable pouring pause time length, and sending the pouring pause accumulated time length early warning signal by the alarm.
Preferably, an upper computer can be further arranged, the controller can send data such as the height value of the concrete liquid level of the distributing hopper, the continuous pouring time, the pouring intermittent time, the pouring times of the distributing hopper and the like to the upper computer, and a concrete total pouring time early warning model, a concrete pouring height analysis model in the groove section and a concrete pouring pause time early warning model can be built in the upper computer; the real-time concrete pouring height, the total pouring time length and the pouring pause accumulated time length in the groove body can be tracked in real time through the model.
Preferably, the method for establishing the concrete total pouring time early warning model, the concrete pouring height analysis model in the groove section and the concrete pouring pause time early warning model in the upper computer comprises the following steps:
step 1: the controller can collect the time sequence H, H = (H, t) of the concrete liquid level height in the distribution hopper according to the same sampling time interval, and sends the time sequence H, H = (H, t) to the upper computer, wherein H is a height value, and t is a sampling time.
Step 2: the Δ t can be set as a liquid level measurement time interval, and the upper computer can analyze and calculate the concrete pouring starting time, the concrete pouring starting time of each tank, the concrete pouring ending time and the concrete pouring interruption time as follows on the basis of the concrete liquid level height time sequence H, H = (H, t) in the branch hopper:
setting the initial time as 0, no material exists in the hopper at this time, h (0) is the initial height value of the concrete liquid level, and calculating the pouring starting time of the first tank of concrete according to the following formula:
h(t+(c+1)Δt)-h(t+cΔt)>h s (1)
T s ＝t (2)
in the formula, delta t is a liquid level measurement time interval; c =1,2,3 t ，c t The number of sampling times at the moment t is; h is a total of s The method comprises the following steps of (1) setting a liquid level difference threshold value of two adjacent sampling; when c is continuous t The difference of the liquid level heights of two times of adjacent sampling is larger than the threshold value h s When the concrete transportation vehicle is used, the concrete transportation vehicle begins to unload materials into the material distribution hopper; t is a unit of s To begin the casting campaign.
And calculating the current discharging end time of the ith tank and the concrete starting time of the next tank according to the following formulas:
h(t+cΔt)-h(t+(c+1)Δt)>h s (3)
wherein
When the concrete pouring end time of the ith tank is the time when the negative value of the difference of the liquid level heights of two consecutive samples is greater than the threshold value h s Then the concrete pouring of the tank is finished;
c is the smallest positive integer satisfying formula (5) s The minimum value of the rise of the liquid level is measured twice;
indicating an intermediate time interval from the end of the ith tank to the start of the (i + 1) th tank.
Concrete placement pause time was calculated as follows:
h(t+(c p +1)Δt)＝h(t+c p Δt) (7)
T p For the time of pause, show in
And if the concrete liquid level is not changed in the time period, the concrete pouring in the time period is considered to be suspended.
And step 3: establishing a concrete pouring total duration early warning model as shown in the following formula:
T a ＝D/v (9)
T b ＝T-T s (10)
T a -T b <T w (11)
wherein D is the groove section depth, v is the minimum raising speed when the design requirement is small, and T s For the start of casting, T is the current time, T b For the poured time, T a The maximum allowable casting time; when T is a And T b The difference between them is less than threshold T w ，T w >And 0, carrying out early warning on the total pouring time.
And 4, step 4: establishing a concrete pouring height analysis model in the groove section of the impervious wall as shown in the following formula:
wherein V n The volume of concrete in the nth tank, m is the total number of tanks, d is the casting height in the groove section, A d The area of the horizontal section of the groove section at the height of d; v m The concrete volume is measured in real time.
And 5: establishing a concrete pouring pause time analysis model shown as the following formula:
wherein
Early warning threshold value T for concrete pouring pause duration p And when the concrete pouring pause duration exceeds a threshold value, early warning is carried out.
A material distributing hopper: is a transfer device for pouring concrete into the impervious wall groove body. The concrete tank truck pours the concrete into the material distributing hopper, and the material distributing hopper slowly discharges the concrete into the impervious wall groove body for pouring.
First tank concrete: the concrete is poured into the distributing hopper for the first concrete tank truck.
The concrete liquid level detector, the controller, the upper computer, the display and the alarm are arranged in the controller, and the timer, the counter, the processor, the distance measuring sensor, the infrared distance measuring sensor, the laser distance measuring sensor and the like can be constructed by adopting applicable components and functional modules in the prior art or by adopting applicable components and functional modules in the prior art and adopting conventional technical means.
The concrete total pouring time early warning model, the concrete pouring height analysis model in the groove section, the concrete pouring pause time early warning model and the like can all adopt applicable functional modules in the prior art, or adopt software and hardware in the prior art, and are constructed by adopting conventional technical means according to a programming manual.
The communication connection method of the concrete liquid level detector, the controller, the upper computer, the display, the alarm and the like can adopt the method in the prior art to connect and communicate, for example, the communication is realized through a field bus or a wireless WIFI (wireless fidelity) mode. The connection communication can be specifically carried out according to the model selection of the pouring site condition and the component specification.
The above-mentioned embodiments are only for illustrating the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to carry out the same, and the present invention shall not be limited to the embodiments, i.e. the equivalent changes or modifications made within the spirit of the present invention shall fall within the scope of the present invention.
Claims (10)
1. A concrete diaphragm wall pouring process control and early warning system is characterized by comprising a controller, a concrete liquid level detector, a display and an alarm, wherein the concrete liquid level detector, the display and the alarm are all communicated with the controller;
the concrete liquid level detector is used for detecting the height of the concrete liquid level of the distributing hopper;
the timer is used for timing the concrete continuous pouring time and the pouring intermittent time;
the counter is used for accumulating the pouring times of the distributing hopper;
the display is used for displaying data of the concrete impervious wall pouring process;
the alarm is used for early warning that the total pouring time length and the accumulated pouring pause time length of the concrete are about to reach the upper limit;
the processor collects signals of the concrete liquid level detector, outputs the signals to control the work of the timer, the counter and the alarm, and outputs the height value of the concrete liquid level of the distributing hopper, the continuous pouring time, the pouring intermittent time and the pouring times of the distributing hopper to the display for displaying.
2. The system for managing, controlling and early warning the pouring process of the concrete diaphragm wall according to claim 1, wherein the concrete level detector comprises a distance measuring sensor.
3. The system for managing, controlling and early warning the pouring process of the concrete impervious wall according to claim 2, wherein the distance measuring sensor is an infrared distance measuring sensor or a laser distance measuring sensor.
4. The system for managing, controlling and early warning the pouring process of the concrete diaphragm wall according to claim 1, characterized in that the controller is a programmable controller.
5. The system for managing, controlling and early warning the pouring process of the concrete diaphragm wall according to claim 1, wherein the display is a human-machine interface.
6. The system for managing, controlling and early warning the pouring process of the concrete diaphragm wall according to claim 1, further comprising an upper computer, wherein the controller outputs the height value of the concrete level of the sub hopper, the continuous pouring time, the pouring pause time and the pouring times of the sub hopper to the upper computer, and the upper computer analyzes and processes the input signals and sends the processed signals to the controller.
7. A control and early warning method for a pouring process of a concrete diaphragm wall is characterized in that a controller, a concrete liquid level detector, a display and an alarm are arranged, wherein the concrete liquid level detector, the display and the alarm are all communicated with the controller;
a concrete liquid level detector is adopted to detect the height of the concrete liquid level of the distributing hopper;
timing the continuous pouring time and the pouring intermittent time of the concrete by using a timer;
the pouring times of the distributing hopper are accumulated by adopting a counter;
displaying data of the concrete impervious wall pouring process by using a display;
an alarm is adopted to early warn that the total concrete pouring time and the accumulated pouring pause time are about to reach the upper limit;
the processor is adopted to collect the signal of the concrete liquid level detector, output the signal to control the work of the timer, the counter and the alarm, and output the height value of the concrete liquid level of the distributing hopper, the continuous pouring time, the pouring intermittent time and the pouring times of the distributing hopper to the display for displaying.
8. The management and control and early warning method for the pouring process of the concrete impervious wall according to claim 7, characterized by comprising the following steps of:
step A, mounting a concrete liquid level detector on a concrete distributing hopper, and acquiring signals of the concrete liquid level detector by a controller to obtain a concrete liquid level height time sequence in the distributing hopper;
step B, setting the concrete liquid level height to be H when the material distributing hopper is empty 0 The concrete level is H when the hopper is full f (ii) a The controller compares the time sequence of the concrete liquid level height, and when the concrete liquid level height of the material separating hopper is from H 0 When the concrete begins to gradually increase, judging that the current time is the concrete pouring starting time; when the concrete liquid level of the material distributing hopper is changed from H f When the concrete begins to gradually decrease, the concrete pouring time is the time for beginning to pour the concrete; when the concrete liquid level of the hopper is changed from H f Down to H 0 Then, the pouring completion time is the pouring completion time; when the concrete liquid level of the material separating hopper is changed from H 0 To H f From H f Down to H 0 When the counter is 1, the counter is increased; when the continuously measured variable quantity of the concrete liquid level height is lower than a set threshold value, the concrete pouring is suspended in the period;
step C, calculating by the controller according to the depth of the groove section and the required minimum concrete lifting speed to obtain the maximum value of the total concrete pouring time; the timer starts to time from the pouring starting time, the current pouring time is calculated in real time, when the pouring time is more than or equal to 90% of the maximum value of the total pouring time, the controller outputs a total pouring time early warning signal to the alarm and the display, and the alarm sends out the total pouring time early warning signal;
step D, obtaining real-time groove entering concrete volume according to the groove entering starting time, the groove entering finishing time, the counting value of the counter and the concrete volume of the branch hopper; according to the structure of the impervious wall groove body, the real-time concrete pouring height in the groove body is obtained;
and E, accumulating the pouring pause time, comparing the accumulated time with the required maximum allowable pouring pause time, outputting a pouring pause accumulated time early warning signal to an alarm and a display by the controller when the pouring pause accumulated time is more than or equal to 90% of the maximum allowable pouring pause time, and sending the pouring pause accumulated time early warning signal by the alarm.
9. The method for managing, controlling and early warning the pouring process of the concrete diaphragm wall according to claim 7, characterized in that an upper computer is further arranged, so that the controller sends the height value of the concrete level of the branch hopper, the continuous pouring time, the pouring pause time and the pouring times of the branch hopper to the upper computer, and a concrete total pouring time early warning model, a concrete pouring height analysis model in the groove section and a concrete pouring pause time early warning model are established in the upper computer; and tracking the real-time concrete pouring height, the total pouring time and the pouring pause accumulated time in the groove body in real time through the model.
10. The control and early warning method for the pouring process of the concrete diaphragm wall according to claim 9, characterized in that the method steps of establishing a concrete total pouring time early warning model, a concrete pouring height analysis model in the groove section and a concrete pouring pause time early warning model in the upper computer comprise the following steps:
step 1: enabling a controller to collect a concrete liquid level height time sequence H, H = (H, t) in a distribution hopper according to the same sampling time interval, and sending the concrete liquid level height time sequence H, H = (H, t) to an upper computer, wherein H is a height value, and t is a sampling time;
step 2: and setting delta t as a liquid level measurement time interval, and analyzing and calculating the concrete pouring starting time, the concrete pouring starting time of each tank, the concrete pouring ending time and the concrete pouring interruption time by the upper computer on the basis of H:
setting the initial time as 0, no material exists in the hopper at this time, h (0) is the initial height value of the concrete liquid level, and calculating the pouring starting time of the first tank of concrete according to the following formula:
h(t+(c+1)Δt)-h(t+cΔt)>h s (1)
T s ＝t (2)
in the formula, delta t is a liquid level measurement time interval; c =1,2,3 t ，c t The number of sampling times at the moment t is; h is s The method comprises the following steps of (1) setting a liquid level difference threshold value of two adjacent sampling; when c is continuous t The difference of the liquid level heights of two times of adjacent sampling is larger than the threshold value h s When the concrete is discharged, the concrete is considered to be discharged into the material distributing hopper from the interior of the concrete transport vehicle; t is s Beginning pouring time;
and calculating the current discharging end time of the ith tank and the concrete starting time of the next tank according to the following formulas:
h(t+cΔt)-h(t+(c+1)Δt)>h s (3)
wherein
When the concrete pouring end time of the ith tank is the time when the negative value of the difference of the liquid level heights of two consecutive samples is greater than the threshold value h s Then the concrete pouring of the tank is finished;
c is the smallest positive integer satisfying formula (5) s The minimum value of the rise of the liquid level is measured twice;
represents the intermediate time interval from the end of the ith tank to the start of the (i + 1) th tank;
concrete placement pause time was calculated as follows:
h(t+(c p +1)Δt)＝h(t+c p Δt) (7)
T p for the time of pause, show in
If the concrete liquid level does not change in the time period, the concrete pouring in the time period is considered to be suspended;
and step 3: establishing a concrete pouring total duration early warning model shown as the following formula:
T a ＝D/v (9)
T b ＝T-T s (10)
T a -T b <T w (11)
where D is the groove section depth, v is the minimum rise velocity for the design requirement hour, T s For the start of casting, T is the current time, T b For the poured time, T a The maximum allowable pouring time; when T is a And T b The difference between them is less than threshold T w ，T w >0, carrying out early warning on the total pouring time;
and 4, step 4: establishing a concrete pouring height analysis model in the cut-off wall groove section as shown in the following formula:
wherein V n The volume of concrete in the nth tank, m is the total number of tanks, d is the casting height in the groove section, A d The area of the horizontal section of the groove section at the height of d; v m The concrete volume is real-time entering the tank;
and 5: establishing a concrete pouring pause time analysis model shown as the following formula:
wherein
Early warning threshold value T for concrete pouring pause duration p And when the concrete pouring pause time exceeds a threshold value, early warning is carried out.
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