JP2017009596A - Pressure delivery performance evaluation system of fresh concrete - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately and adequately evaluate a pressure delivery performance of fresh concrete fed from a concrete pump vehicle to prevent clogging of a piping before happens.SOLUTION: A pressure delivery performance evaluation system of fresh concrete comprises a detector tube 120 including: a load unit which is arranged on a pressure delivery passage (transport piping 40 etc.) for fresh concrete to apply load for the pressure delivery of the fresh concrete; and a low load unit which is applied with a lower load compared with the load unit. Measuring means 20 is attached to the detector tube 120. Measurement is performed based on information acquired by the measuring means 20 consisting of at least one kind of sensor of an acceleration meter, a power generation element, a piezoelectric element, a displacement meter, a strain gage, a pressure gage, a speed meter, and a flow meter with respect to the force generated when fine aggregates and coarse aggregates contained in the fresh concrete contact with the pressure delivery passage. A pressure delivery performance of fresh concrete and possibility of occurrence of clogging in the pressure delivery passage is evaluated by evaluation means 30.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a system for evaluating the pumping performance of fresh concrete, and more particularly, to a system for preventing blockage of a pumping path by evaluating the pumping performance of fresh concrete delivered from a concrete pump car. is there.

  In construction where concrete must be cast away from the concrete pump car, such as a bridge superstructure, it is necessary to arrange a transport pipe to the concrete placement position and pump the fresh concrete. Here, when the extension distance of the transport pipe is long, the transport pipe may be blocked depending on the quality of the fresh concrete to be pumped.

  In the construction of a concrete structure, the blockage of the transport pipe that occurs during the placement of the concrete increases the risk of causing defects (unfilled or cold joints) in the structure, which is a major factor that causes a deterioration in quality. In addition, there is a risk that an accident accompanying a sudden blockage of the transport pipe may occur (the transport pipe may burst). In addition, much effort and cost are required to restore and remove the blocked transport pipe.

  In order to cope with such inconvenience, when one of the transport pipes is blocked by arranging two transport pipes, it is currently switched to the other transport pipe to pump the fresh concrete. It is.

  Moreover, the apparatus for monitoring the obstruction | occlusion of the transport pipe which pumps fresh concrete is proposed (for example, refer patent document 1). In the technique described in Patent Document 1, an acoustic emission sensor is attached to the outer wall side of the transport pipe, and the frictional sound between the fresh concrete being pumped and the inner wall of the transport pipe is detected, so that the material of the fresh concrete is separated. It is a device that determines whether or not there is.

  Specifically, the concrete material separation judgment means judges whether or not the fresh concrete material is separated based on the friction sound detected by the acoustic emission sensor, and outputs the judgment result to the monitoring result output means. It has become.

  When the fresh concrete is in good condition and the aggregate is covered with mortar, the fresh concrete is smoothly pumped through the transport pipe, and the friction sound between the fresh concrete and the transport pipe is small. On the other hand, when the aggregate and the mortar are separated, it can be determined that the aggregate may collide with the inner wall of the transport pipe to increase the frictional force and cause the transport pipe to be blocked.

JP-A-9-218183

  In the technique described in Patent Document 1 described above, when the material separation of concrete (separation of aggregate and mortar) is judged, a place where a blockage is likely to occur (for example, a connection part of a bent pipe and a straight pipe, a flexible hose Frictional noise is collected by a sensor provided at the connecting part of the straight pipe) and sorted in descending order of volume. Then, the administrator investigates whether or not a clogging trouble has occurred, and if a clogging trouble has actually occurred, the route of the transport pipe can be changed by changing the blending ratio of fresh concrete and the material used. Measures such as making it more appropriate.

  However, such a method for managing the blockage of the transport pipe is not realistic. That is, even if the technique described in Patent Document 1 is used, it seems that the friction noise generated between the transport pipe and the concrete is strongly influenced when the concrete is fed, such as the mixing ratio of concrete, the pumping speed, and the pumping path. It is not enough to make an engineering decision on how to deal with the factors.

  Even if it is possible to detect a blockage at a position away from the pump truck, such as a connection part between a vent pipe and a straight pipe, or a connection part between a flexible hose and a straight pipe, it is already unsuitable for pumping. It is easily guessed that it is extremely difficult to resume pumping after detection because the transport pipe is filled with high concrete).

  The present invention has been proposed in view of the above-described circumstances, and is capable of preventing obstruction of the pumping path by accurately and appropriately evaluating the pumping performance of fresh concrete delivered from a concrete pump car. The purpose is to provide a system for evaluating the concrete pumping performance.

  The fresh concrete pumping performance evaluation system of the present invention has the following features in order to achieve the above-described object. That is, the fresh concrete pumping performance evaluation system of the present invention is a system for evaluating the pumping performance of fresh concrete delivered from a concrete pump car, and includes a detection pipe disposed in the fresh concrete pumping path, and a detection pipe. It is characterized in that it is provided with a measuring means attached to and an evaluation means.

  The detection tube has a load portion that applies a load to the pumping of the fresh concrete and a low load portion that has a smaller load applied to the pumping of the fresh concrete than the load portion.

  The measuring means is attached to the detection tube, and the force generated when the fine aggregate or coarse aggregate contained in the fresh concrete comes into contact with the transport tube is converted into a vibration meter, an accelerometer, and a sensor that generates electricity (for example, A power generation element or a piezoelectric element), a displacement meter, a strain gauge, a pressure gauge, a flow meter, and a speedometer.

  The evaluation means uses information measured by the measurement means, and uses at least one of waveform, frequency, acceleration, amplitude, current, voltage, resistance, energy, displacement, strain, pressure, flow rate, flow velocity, and fresh concrete. It is a means for evaluating the pumping performance and the possibility of occurrence of clogging in the transport pipe.

  In the pumping performance evaluation system for fresh concrete having the above-described configuration, the load portion of the detection tube includes a reduced diameter portion whose inner diameter gradually decreases in the pressure feeding direction of the fresh concrete. The ratio of the inner cross-sectional area of the widest section to the narrowest section is preferably 45% or more and 95% or less, and the ratio of the inner diameter of the widest section to the length of the reduced diameter portion is preferably 25 or less. .

  In the system for evaluating the pumping performance of fresh concrete having the above-described configuration, the measuring unit performs measurement by combining two or more types of sensors, and the evaluating unit uses the information measured by the measuring unit to pump the fresh concrete. It is possible to evaluate the possibility of blockage occurring in the route.

  In the fresh concrete pumping performance evaluation system having the above-described configuration, the detection tube is preferably attached in the vicinity of the concrete pump truck.

  In the fresh concrete pumping performance evaluation system having the above-described configuration, it is preferable that a sensor is attached below the horizontal position of the detection tube.

  According to the pumping performance evaluation system for fresh concrete according to the present invention, there is provided a detector tube having a load portion that applies a load to the pumping of fresh concrete, and a low load portion that has a smaller load applied to the fresh concrete than the load portion. By providing, in the actual fresh concrete pumping path, it is possible to create a state in a short section that is the same as the location where the pumping load is different.

  In addition, by providing the detection tube, it is possible to create different situations of the pumping load at arbitrary locations regardless of the type and combination of the pumping paths. In addition, a pressure feed route is a cylinder of a concrete pump truck, piping and a boom part connected to the cylinder, a transport pipe for transporting fresh concrete to a place separated from the concrete pump truck, and the like.

  Since the pumping performance can be evaluated using information appropriate for evaluating the pumping system from various data generated in the detection tube, an accurate evaluation can be performed. Moreover, the accuracy of evaluation can be further improved by performing evaluation using a plurality of data. Further, by specifying the specifications of the reduced diameter portion in the detection tube, more accurate measurement can be performed.

  In addition, by attaching a detection pipe in the vicinity of the concrete pump truck, it is possible to know the pumping performance of fresh concrete pumped from the concrete pump truck at an early stage of the pumping. Moreover, the information regarding the pressure feeding state of fresh concrete can be reliably detected by attaching a sensor below the horizontal position of the detection tube.

  As described above, by using the fresh concrete pumping performance evaluation system according to the present invention, it is possible not only to prevent blockage of the pumping path composed of transport pipes and the like, but also to improve work efficiency as well as the quality of the structure. Can be increased. In addition, the safety of the pressure feeding operation can be improved.

The block diagram of the functional means which comprises the pumping performance evaluation system of the fresh concrete which concerns on this invention. Explanatory drawing which shows the pumping path | route of fresh concrete. The schematic diagram which shows the structure of a detection tube. Explanatory drawing which shows the shape of a reduced diameter part. Explanatory drawing of the test result of a mixing | blending of fresh concrete and a fresh property. The graph which shows the relationship between the mixing | blending of the fresh concrete in a detection tube, and the peak value of an acceleration amplitude. The graph which shows the relationship between the mixing | blending of fresh concrete in a taper pipe, and the peak value of an acceleration amplitude. The graph which shows the evaluation regarding the difference of the acceleration amplitude in a detection tube and a horizontal tube. The graph which shows the relationship between a tamping frequency | count and a flow value. The graph which shows the relationship of the frequency with respect to the peak value of the acceleration in a vent pipe and a horizontal pipe. The graph which shows the relationship of the frequency with respect to the peak value of the acceleration in a taper tube and a horizontal tube. The graph which shows the relationship of the frequency with respect to the peak value of the acceleration in a detection tube and a horizontal tube. The graph which shows evaluation of time passage by the difference in the acceleration in a vent pipe and a horizontal pipe. The graph which shows evaluation of time passage by the difference in the acceleration in a taper pipe and a horizontal pipe. The graph which shows evaluation of time passage by the difference in the acceleration in a detection tube and a horizontal tube. Explanatory drawing which shows the relationship between the mixing | blending and pumping speed of fresh concrete, and the voltage amount per 1 stroke of a cylinder.

  Hereinafter, an embodiment of a fresh concrete pumping performance evaluation system (hereinafter abbreviated as a pumping performance evaluation system) according to the present invention will be described with reference to the drawings. 1 to 4 illustrate a pumping performance evaluation system according to an embodiment of the present invention. FIG. 1 is a block diagram of the pumping performance evaluation system, FIG. 2 is an explanatory diagram showing a pumping path of fresh concrete, and FIG. FIG. 4 is an explanatory diagram showing the shape of the reduced diameter portion.

  FIG. 5 is an explanatory diagram of the test results of fresh concrete mix and fresh properties, FIG. 6 is a graph showing the relationship between the mix of fresh concrete in the detector tube and the peak value of the acceleration amplitude, and FIG. 7 is the graph of fresh concrete in the taper tube. FIG. 8 is a graph showing the relation between the acceleration amplitude difference between the detection tube and the horizontal tube, FIG. 9 is a graph showing the relationship between the number of tampings and the flow value, and FIG. FIG. 11 is a graph showing the relationship of the frequency with respect to the acceleration peak value in the tapered tube and the horizontal tube, and FIG. 12 is a graph showing the relationship of the frequency with respect to the acceleration peak value in the tapered tube and the horizontal tube. FIG. 13 is a graph showing the relationship of frequency to value, and FIG. FIG. 14 is a graph showing the evaluation of time lapse due to the difference in acceleration between the tapered tube and the horizontal tube, and FIG. 15 is a graph showing the evaluation of time lapse due to the difference in acceleration between the detection tube and the horizontal tube. FIG. 16 is an explanatory diagram showing the relationship between the blending and pumping speed of fresh concrete and the amount of voltage per stroke of the cylinder.

<Outline of pumping performance evaluation system>
A pumping performance evaluation system 10 according to an embodiment of the present invention is a system for evaluating the pumping performance of fresh concrete delivered from a concrete pump truck 100 as shown in FIGS. The detection tube 120 is provided having a load portion that is disposed in the path and applies a load to the pumping of fresh concrete, and a low load portion that has a smaller load applied to the pumping of fresh concrete than the load portion.

  The fresh concrete pumping path is a path from the cylinder 110 of the concrete pump truck 100 to the driving position, and the cylinder 110 of the concrete pump truck 100, piping connected to the cylinder 110 and a boom part (not shown). Various devices and members such as a transport pipe 40 that transports fresh concrete to a place separated from the concrete pump truck 100 serve as a pressure feeding path.

  Further, based on the measurement means 20 for measuring the force generated when fine aggregate (sand) or coarse aggregate (gravel) contained in fresh concrete contacts the detection tube 120, and information measured by the measurement means 20. Evaluation means 30 for evaluating the pumping performance of the fresh concrete and the possibility of occurrence of blockage in the pumping route such as the transport pipe 40.

  In general building construction, fresh concrete is often driven directly from the concrete pump truck 100, and blockage occurs in the pressure-feeding route such as piping and boom parts (not shown) installed in the concrete pump truck 100. It is necessary to evaluate the possibility. In this case, the detection tube 120 is attached to the cylinder 110, the piping, and the boom portion.

  Further, in a construction where concrete needs to be placed at a place away from the concrete pump truck 100 such as a bridge superstructure, the transport pipe 40 is disposed to the concrete placement position, and the fresh concrete is pumped. In this case, there are a cylinder 110 for delivering fresh concrete from the concrete pump truck 100 and a transport pipe 40 connected to the cylinder 110 as a pressure feed path for the fresh concrete, and the detection pipe 120 is connected to such a pressure feed path. Install.

  Moreover, there are straight pipes, vent pipes, flexible pipes, and the like as the types of transport pipes 40, and the fresh concrete pumping path is not constant and straight, such as horizontal, up, down, bent. Furthermore, the fresh concrete to be pumped has different frictional resistance values in the pumping path depending on the blending ratio of cement, water, fine aggregate, coarse aggregate, and other additives.

  The pumping performance evaluation system 10 according to the embodiment of the present invention is a system that can cope with the actual situation that concrete must be placed in various manners for each site. By creating a state similar to a pipe, a vent pipe, a flexible pipe, etc., and using the measurement information measured in the detection pipe 120, accurately and appropriately evaluating the pumping performance of fresh concrete sent from the concrete pump car 100 Further, it is possible to prevent obstruction in the pressure feeding path of the transport pipe 40 or the like.

<Detector tube>
The detection tube 120 has a load portion that applies a load to the pumping of fresh concrete, and a low load portion that has a smaller load applied to the fresh concrete than the load portion. That is, as shown in FIGS. 3A to 3E, the detection tube 120 has a diameter-reduced portion 121 whose inner diameter gradually decreases along the pressure feeding direction of fresh concrete, and the inner diameter gradually increases. The enlarged diameter portion 123 is a low load portion, and the reduced diameter portion 121 is a load portion.

  Further, between the reduced diameter portion 121 and the enlarged diameter portion 123, there may be provided a reduced diameter continuous portion 122 in which the same inner diameter as the portion with the smallest inner diameter continues (a), or the reduced diameter portion 121. And the enlarged diameter portion 123 may be continuous (b), and in the pumping direction of the fresh concrete, the same inner diameter as the portion with the largest expanded inner diameter is continuous on the front side or the rear side of the enlarged diameter portion 123. An enlarged diameter continuous portion 124 may be provided (c, d), and the same inner diameter as that of the portion with the largest expanded inner diameter is continuous on the front side and the rear side of the enlarged diameter portion 123 in the pressure feeding direction of the fresh concrete. An enlarged diameter continuous portion 124 may be provided (e).

  As described above, the load portion of the detection tube is a reduced diameter portion in which the inner diameter gradually decreases in the direction of pumping of fresh concrete, and the reduced diameter portion has the widest cross section and the largest cross section as shown in FIG. It is preferable that the ratio of the internal cross-sectional area to the narrow cross section is 45% or more and 95% or less, and the ratio of the inner diameter of the widest cross section to the length of the reduced diameter portion is 25 or less.

<Measuring means>
The measurement means 20 includes a vibration meter, an accelerometer, a sensor that generates electricity (for example, a sensor that generates electricity in connection with vibration, such as a power generation element or a piezoelectric element), a displacement meter, a strain gauge, a pressure gauge, and a flow rate. One type or two or more types of speedometers (sensors related to deformation and pressure) are used. In each sensor, fine aggregates and coarse aggregates contained in fresh concrete contact the transport pipe 40, the cylinder 110 of the concrete pump truck 100, and the piping and boom parts (not shown) installed in the concrete pump truck 100. The measurement information is used for evaluation in the evaluation means 30. In the present embodiment, in particular, the measuring unit 20 is attached to the detection tube 120, but the accuracy of the evaluation in the evaluation unit 30 can be further increased by attaching the measuring unit 20 to other places (appropriate places in the pumping path).

  In addition, the measurement by a displacement meter or a strain meter is the measurement in the circumferential direction and axial direction of the transport pipe 40, for example. The information measured by the measuring means 20 relates to the force generated when the fine aggregate or coarse aggregate contained in the fresh concrete comes into contact with the transport pipe 40 or the cylinder 110, piping, or boom part of the concrete pump truck 100. Is. In evaluating the information measured by the measuring means 20, information such as temporal changes and shapes may be used in addition to the measured value itself.

<Evaluation means>
The evaluation unit 30 acquires the information measured by the measurement unit 20 and performs evaluation according to the type of each information, so that the pumping performance of fresh concrete and the possibility of occurrence of clogging in the pumping route such as the transport pipe 40 are obtained. evaluate. The measuring means 20 is composed of at least one type or a combination of two or more types of the above-described sensors, and information used for evaluation includes waveforms, frequencies, accelerations, amplitudes, currents, voltages, resistances acquired by these sensors, Energy, displacement, strain, pressure, flow rate, flow velocity.

  By measuring information obtained from a plurality of types of sensors in combination, it is possible to realize high measurement accuracy and evaluation accuracy. For example, in addition to the voltage value and the acceleration, by using the displacement amount of the pumping path such as the transport pipe 40, the pumping load on the pumping path such as the transport pipe 40 and the pumping speed of the fresh concrete can be determined.

  The evaluation means 30 can be configured by a personal computer, a microcomputer, a tablet-type portable terminal, and an application program installed therein. Since the personal computer or microcomputer can be connected with input means 50 such as a keyboard and mouse and output means 60 such as a display device, a printer, an amplifier and a speaker as accessory devices, it is possible to input and evaluate instruction signals. Data can be output.

  Furthermore, information output from the sensor may change depending on the usage time, usage location, and the like. Therefore, it is preferable to correct the information by appropriately performing calibration according to the usage status of the sensor constituting the evaluation unit 30.

  In addition, each sensor constituting the measuring unit 20 and the evaluation unit 30 may be connected by wire using an electric cable, or may be connected wirelessly by using radio waves, infrared rays, and a relay device. The wired connection or the wireless connection may be appropriately selected according to the connection state between the sensor mounting position and the evaluation means 30, that is, the distance, the presence or absence of a shielding object, and the like.

<Detection tube placement position>
The arrangement position of the detection tube 120 is not particularly limited, but is preferably in the vicinity of the concrete pump vehicle 100 as shown in FIG. By attaching the detection tube 120 in the vicinity of the concrete pump truck 100, it is possible to know the pumping performance of the fresh concrete pumped from the concrete pump truck 100 at an early stage in the initial stage of pumping.

  Here, when attempting to obtain a highly accurate waveform using each sensor, the amount of data can be reduced in the region where the frequency (frequency) is low, and handling as information processing is improved. If the amount of data is reduced, data can be collected remotely by wireless communication. Further, there is an advantage that a sensor having a low frequency band can be easily obtained.

<Evaluation of pumping performance>
Depending on the operating state of the pressure pump (cylinder 110), pulsation occurs in the fresh concrete pressure-fed in the pressure-feed path such as the cylinder 110 and the transport pipe 40, and the waveform, frequency, Acceleration, amplitude, current, voltage, resistance, energy, displacement, strain, pressure, flow rate, and flow velocity change. Moreover, by attaching the measuring means 20 to the detection tube 120 having a load portion and a low load portion with different pumping loads of fresh concrete and acquiring various information, various shapes such as a straight tube, a vent tube, a flexible tube, etc. It is possible to simulate a pressure feeding route such as a certain transport pipe 40 or the like. Therefore, information necessary for evaluating the pumping performance of fresh concrete can be acquired in real time according to the situation at the site.

  Further, by combining information acquired from the above-described multiple types of sensors, various calculations can be performed in real time, and the pumping speed of the fresh concrete can be accurately evaluated in consideration of the pumping speed of the fresh concrete.

  As described above, the waveform, frequency, acceleration, amplitude, current, voltage, resistance, energy, displacement, strain, pressure, flow rate, and flow velocity, which are measurement information of the sensor, are used for evaluation. For example, when the pumping speed of fresh concrete increases, the pumping pressure in the pumping path such as the transport pipe 40 increases, and the acceleration value tends to increase. Furthermore, in the case of fresh concrete with a composition that tends to cause clogging, the shape of acceleration tends to show irregular shapes with much disturbance compared to a composition that is less likely to clog and is smoothly pumped.

  Further, when the pumping speed of fresh concrete is increased, the acceleration and amplitude tend to increase. Furthermore, in the case of fresh concrete with a composition that tends to cause clogging, the acceleration and amplitude tend to be higher as compared to a blend that is less likely to clog and is being pumped smoothly. In addition, acceleration and amplitude tend to decrease as the slump increases.

  In addition, by using the difference or ratio of peak values measured in the straight pipe part and the vent pipe part (by comparing the data obtained in different pumping load situations), the pumping performance of fresh concrete is evaluated. You can also. In the present embodiment, by providing the detection tube 120, a situation in which the pumping load is different is created at an arbitrary place regardless of the type and combination of the transport tube 40 and the like in the pumping route.

  As described above, since there is a correlation between the waveform, frequency, acceleration, amplitude, current, voltage, resistance, energy, displacement, strain, pressure, flow rate, flow velocity, and pumping performance of fresh concrete, from one type of sensor By combining the acquired information or information acquired from a plurality of types of sensors, the pumping performance of fresh concrete can be accurately and appropriately evaluated.

<Evaluation of pumping performance of fresh concrete>
The test result regarding the pumping performance evaluation of fresh concrete using the pumping performance evaluation system 10 according to the present embodiment will be described with reference to FIGS. FIG. 5 to FIG. 9 show the difference in the type of fresh concrete by the detection pipe and the performance difference between the detection pipe and other pipes. FIGS. 10 to 14 show the effectiveness of the detector tube and the blockage management method (evaluation of the passage of time). FIG. 16 shows the relationship between the composition and the electrical energy obtained by converting the resistance during pumping into a voltage amount.

  As apparent from FIGS. 5 to 16, the pumping performance of fresh concrete can be accurately evaluated by using the pumping performance evaluation system 10 according to the present embodiment. Therefore, according to the pumping performance evaluation system 10 according to the present embodiment, it is possible to prevent the pumping path from being blocked and improve the work efficiency. Furthermore, since the pumping performance of fresh concrete is accurately evaluated, the quality of the structure using the fresh concrete can be improved.

DESCRIPTION OF SYMBOLS 10 Pumping performance evaluation system 20 Measuring means 30 Evaluation means 40 Transport pipe 50 Input means 60 Output means 100 Concrete pump car 110 Cylinder 120 Detector pipe 121 Diameter reduction part 122 Diameter reduction continuous part 123 Diameter expansion part 124 Diameter expansion continuous part

Claims (5)

A system for evaluating the pumping performance of fresh concrete delivered from a concrete pump car,
A detector tube that is disposed in the pumping path of the fresh concrete and has a load portion that applies a load to the pumping of the fresh concrete, and a low load portion that has a lower load applied to the pumping of the fresh concrete than the load portion. With
The force generated when the fine aggregate or coarse aggregate contained in the fresh concrete is in contact with the detection tube, vibrometer, accelerometer, electricity generating sensor, displacement meter, A measuring means for measuring using at least one sensor of a strain gauge, a pressure gauge, a flow meter, and a speedometer;
Pumping the fresh concrete using at least one of the waveform, frequency, acceleration, amplitude, current, voltage, resistance, energy, displacement, strain, pressure, flow rate, and flow velocity, which is information measured by the measuring means. Evaluation means for evaluating performance and the possibility of occurrence of blockage in the pumping path;
A system for evaluating the pumping performance of fresh concrete. The load portion of the detection tube includes a reduced diameter portion whose inner diameter gradually decreases toward the pumping direction of the fresh concrete,
In the reduced diameter portion, the ratio of the inner cross-sectional area of the widest cross section to the narrowest cross section is 45% or more and 95% or less, and the ratio of the inner diameter of the widest cross section to the length of the reduced diameter portion is 25. The fresh concrete pumping performance evaluation system according to claim 1, wherein: The measurement means performs measurement by combining two or more types of the sensors,
The evaluation means uses information measured by the measurement means to evaluate the pumping performance of the fresh concrete and the possibility of occurrence of clogging in the pumping path.
The system for evaluating the pumping performance of fresh concrete according to claim 1 or 2.   4. The fresh concrete pumping performance evaluation system according to claim 1, wherein the detection pipe is attached in the vicinity of the concrete pump car. 5. Mounting the sensor below the horizontal position of the detector tube;
The fresh concrete pumping performance evaluation system according to any one of claims 1 to 4.

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