JP2017009510A - 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 under pressure using a piping to prevent clogging of the piping before happens.SOLUTION: A pressure delivery performance evaluation system of fresh concrete evaluates a pressure delivery performance of fresh concrete and possibility of occurrence of clogging in a piping 40 by using evaluation means 30 on the basis of information acquired by measuring means 20 consisting of at least one sensor of a vibration meter, an acceleration meter, a power generation element, a piezoelectric element, a displacement meter, a strain gage, a pressure gage, a flow meter, and a speed meter with respect to the force generated when fine aggregates and coarse aggregates contained in the fresh concrete contact with the piping 40 or a cylinder 110 of a concrete pump vehicle 100.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a system for evaluating the pumping performance of fresh concrete, and more specifically, for evaluating the pumping performance of fresh concrete to be pumped using a concrete transport pipe to prevent blockage of the concrete transport pipe. It is about the system.

  In a construction where concrete must be cast away from a concrete pump car, such as a bridge superstructure, it is necessary to arrange a concrete transport pipe to the concrete placement position and pump the fresh concrete. Here, there is a possibility that the concrete transport pipe may be blocked when the extension distance of the concrete transport pipe (pipe) is long or depending on the quality of the fresh concrete to be pumped. Hereinafter, a concrete transport pipe disposed for placing concrete will be referred to as piping.

  In the construction of a concrete structure, the blockage of piping that occurs during the placement of 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 of an accident (pipe rupture) associated with a sudden blockage of the pipe. Moreover, much labor and cost are required for restoration and removal of the blocked pipe.

  In order to deal with such inconvenience, when one of the pipes is closed by arranging two pipes, the current situation is that the fresh concrete is pumped by switching to the other pipe.

  Moreover, the apparatus for monitoring the obstruction | occlusion of the piping 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 a pipe, and whether or not the material of the fresh concrete is separated by detecting a frictional sound between the fresh concrete being pumped and the inner wall of the pipe. It is a device that determines whether or not.

  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 a good state and the aggregate is covered with mortar, the fresh concrete is smoothly pumped through the pipe, and the friction sound between the fresh concrete and the 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 pipe to increase the frictional force and cause the 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, change the mixing ratio of fresh concrete and the material used to change the piping route. It is going to take measures such as making it more appropriate.

  However, such a pipe blockage management method is not practical. That is, even if the technique described in Patent Document 1 is used, engineering to deal with factors that are thought to strongly influence the frictional noise generated between the pipes, such as the mixing ratio of concrete, the pumping speed, and the pumping path. It is not enough to make a good judgment.

  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.

  The present invention has been proposed in view of the above-described circumstances, and is a fresh concrete capable of preventing the blockage of a pipe by accurately and appropriately evaluating the pumping performance of the fresh concrete pumped using the pipe. The purpose is to provide a system for evaluating the 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. In other words, 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 via a pipe, and comprises a measuring means and an evaluation means. It is a feature.

  The measuring means includes a vibration meter, an accelerometer, and a sensor that generates electricity (for example, power generation) using the force generated when fine aggregate or coarse aggregate contained in fresh concrete contacts the cylinder of a pipe or a concrete pump truck. Element or piezoelectric element), a displacement meter, a strain meter, a pressure meter, a flow meter, and a velocity meter.

  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 possibility of the blockage generation | occurrence | production of the pressure-feeding performance and piping.

  In the system for evaluating the pumping performance of fresh concrete having the above-described configuration, the measuring means performs measurement by combining two or more types of sensors, and the evaluating means uses the information measured by the measuring means to determine the pumping performance and piping of the fresh concrete. It is possible to evaluate the possibility of occurrence of occlusion.

  In the fresh concrete pumping performance evaluation system having the above-described configuration, the sensor is installed at multiple measurement positions with arbitrary separation, and the evaluation means uses information measured at the multiple measurement positions. It is possible to specify the range and position of the blockage occurring in the pipe.

  In the fresh concrete pumping performance evaluation system configured as described above, the measuring means can be attached in the vicinity of the concrete pump truck.

  Further, in the fresh concrete pumping performance evaluation system having the above-described configuration, it is possible to attach a sensor to a measurement position using a magnetic jig.

  Moreover, in the fresh concrete pressure-feeding performance evaluation system having the above-described configuration, when the sensor is attached to the pipe, the sensor is preferably attached below the horizontal position of the pipe.

  According to the pumping performance evaluation system for fresh concrete according to the present invention, the pumping performance is evaluated using information appropriate for evaluating the pumping system from various data generated in the pumping process of fresh concrete. Therefore, accurate evaluation can be performed. Moreover, the accuracy of evaluation can be further improved by performing evaluation using a plurality of data.

  Further, by attaching a measuring means 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. In addition, the sensor can be easily attached and detached by attaching the sensor to the measurement position using a magnetic jig. Furthermore, by attaching a sensor below the horizontal position of the pipe, it is possible to reliably detect information related to the pressure feeding state of fresh concrete.

  As described above, by using the fresh concrete pumping performance evaluation system according to the present invention, it is possible not only to prevent the clogging of the piping and increase the work efficiency, but also to improve the quality of the structure. 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 explaining the arrangement | positioning position of a sensor. The schematic diagram of the mounting jig of a sensor.

  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. FIGS. 1 to 3 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 illustrating the positions of sensors, and FIG. It is a schematic diagram of a sensor mounting jig.

<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 sent from a concrete pump vehicle 100 through a pipe 40 as shown in FIGS. 1 and 2. Measuring means 20 for measuring force generated when fine aggregate (sand) or coarse aggregate (gravel) contained in the fresh concrete contacts the pipe 40 or the cylinder 110 of the concrete pump truck 100; The evaluation means 30 is provided for evaluating the pumping performance of fresh concrete and the possibility of clogging in the pipe 40 based on the information measured by the above.

  For example, in a construction where concrete needs to be placed away from the concrete pump truck 100 such as a bridge superstructure, it is necessary to arrange the pipe 40 to the concrete placement position and pump the fresh concrete. is there. In this case, the fresh concrete pressure feed path includes a cylinder 110 for sending fresh concrete in the concrete pump truck 100 and a pipe 40 connected to the cylinder 110. The pipe 40 includes a straight pipe and a vent pipe. And flexible pipes. Further, as shown in FIG. 2, the fresh concrete pressure-feeding path is not constant and linear, such as horizontal, up, down, bent, and the like. 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 ways for each site, and the piping 40 is connected from the concrete pump car 100. By accurately and appropriately evaluating the pumping performance of the fresh concrete delivered through the pipe 40, it is possible to prevent the piping 40 from being blocked.

<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. Each sensor is a device for measuring a force generated when fine aggregate or coarse aggregate contained in fresh concrete contacts the pipe 40 or the cylinder 110 of the concrete pump truck 100, and the measurement information is evaluated. Used for evaluation at 30.

  In addition, the measurement by a displacement meter or a strain meter is a measurement in the circumferential direction and the axial direction of the pipe 40. 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 contacts the pipe 40 or the cylinder 110 of the concrete pump car 100. 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 information measured by the measurement unit 20 and performs evaluation according to the type of each information, thereby evaluating the pumping performance of fresh concrete and the possibility of occurrence of blockage in the pipe 40. 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, by using the displacement of the pipe 40 in addition to the voltage and the acceleration, it is possible to determine the pumping load on the pipe 40 and the pumping speed of fresh concrete.

  The evaluation means 30 can be configured by a personal computer, a microcomputer, and an application program installed on the personal computer or microcomputer. 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.

<Sensor location>
The sensor may be disposed at any position on the cylinder 110 of the concrete pump truck 100 and the pipe 40 connected to the cylinder 110. It is possible to know the pumping performance of fresh concrete pumped from the concrete pump truck 100 in stages.

  In addition, as shown in FIG. 2, by installing the measuring means 20 at multiple measurement positions with arbitrary separation, the range and position where the pipe 40 is clogged or the possibility of clogging is high. Range and position can be specified.

  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.

<Sensor mounting jig>
The cylinder 110 (covering case) and the pipe 40 of the concrete pump vehicle 100 are generally manufactured from a magnetic material such as iron. Therefore, it is possible to attach the sensor to the measurement position by using a magnetic jig 70 as shown in FIG. For example, the sensor tip can be fixed to the cylinder 110 (covering case) or the pipe 40 of the concrete pump car 100 by processing the tip of the sensor into a magnet type.

<Sensor mounting position for piping>
Since the pipe 40 is tubular, as shown in FIG. 3, when the axial direction is substantially horizontal or a direction close thereto, the pipe 40 is not completely filled with concrete, or the fresh concrete to be pumped is used. Depending on the blending, the fresh concrete is located below the horizontal position of the pipe 40 due to gravity. Therefore, when the sensor is attached to the pipe 40, it is preferable to attach the sensor below the horizontal position of the pipe 40 where the concrete is always in contact regardless of the pumping state or the composition.

<Evaluation of pumping performance>
Depending on the operating state of the pressure pump (cylinder 110), pulsation occurs in the cylinder 110 and the pipe 40, and the waveform, frequency, acceleration, amplitude, current, voltage, which are measurement information of sensors attached to the cylinder 110 and the pipe 40, Resistance, energy, displacement, strain, pressure, flow rate, and flow velocity change. In addition, by attaching sensors (measuring means 20) to a plurality of locations on pipes 40 having various shapes such as straight pipes, vent pipes, flexible pipes, etc., evaluation of the pumping performance of fresh concrete according to the situation at the site Information necessary for the acquisition can be acquired in real time.

  In addition, by combining information acquired from the above-described plurality of types of sensors, various calculations can be performed in real time to accurately evaluate the pumping performance of 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 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.

  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.

DESCRIPTION OF SYMBOLS 10 Pumping performance evaluation system 20 Measuring means 30 Evaluation means 40 Piping 50 Input means 60 Output means 70 Magnetic jig 100 Concrete pump car 110 Cylinder

Claims (6)

A system for evaluating the pumping performance of fresh concrete delivered from a concrete pump car via piping,
The force generated when fine aggregate or coarse aggregate contained in the fresh concrete comes into contact with the pipe or the cylinder of the concrete pump truck is measured by a vibration meter, accelerometer, electricity generating sensor, displacement meter, strain A measuring means for measuring using at least one type of sensor among a meter, 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. An evaluation means for evaluating the performance and the possibility of occurrence of clogging in the piping;
A system for evaluating the pumping performance of fresh concrete. 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 piping.
The fresh concrete pumping performance evaluation system according to claim 1. The sensor is installed at multiple measurement positions with arbitrary separation,
The evaluation means specifies the range and position of the blockage that occurs in the pipe, using information measured at the multiple measurement positions,
The system for evaluating the pumping performance of fresh concrete according to claim 1 or 2.   3. The fresh concrete pumping performance evaluation system according to claim 1, wherein the measuring means is attached in the vicinity of the concrete pump truck. Using a magnetic jig, attach the sensor to the measurement position,
The fresh concrete pumping performance evaluation system according to any one of claims 1 to 4. When the sensor is attached to the pipe, the sensor is attached below the horizontal position of the pipe.
The fresh concrete pumping performance evaluation system according to any one of claims 1 to 5.

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