JP7374845B2 - measuring device - Google Patents

Description

The present invention relates to a measuring device for measuring the unit water volume of a fluid containing fresh concrete or fresh mortar.

In order to ensure the quality of fresh concrete (ready-mixed concrete), civil engineering works ordered by the Ministry of Land, Infrastructure, Transport and Tourism are required to measure the unit water volume during concrete production. Measurement of unit water volume in fresh concrete is now spreading to construction projects other than those ordered by the Ministry of Land, Infrastructure, Transport and Tourism. Methods for measuring the unit water volume of fresh concrete include the air meter method, underwater mass method, high-frequency heating drying method, reduced pressure heating drying method, drying oven method, capacitance method, water concentration measurement method, and salt concentration difference method. Of these, the air meter method and high frequency heating drying method are frequently used.

In the above measurement method, a sample is taken from fresh concrete delivered to the site, for example, by a ready-mixed concrete truck (agitator truck, mixer truck), and the unit water volume of the sample is measured. This measurement method is a sampling measurement, and the result of the sample inspection is highly dependent on the sample taken, and it takes a long time to obtain the measurement result, and the unit water volume of fresh concrete to be poured can be confirmed in real time. Can not do it.

Therefore, the applicant has developed and put into practical use a method (see Patent Document 1) that makes it possible to easily measure the unit water volume of flowing fresh concrete or fresh mortar continuously, in a short time, and with high precision. . According to this method of measuring unit water volume, a moisture meter that emits electromagnetic waves to a fluid containing fresh concrete or fresh mortar and receives electromagnetic waves reflected by moisture is installed in an open space where the fluid to be poured flows. The dynamic measurement values of the flowing fluid are continuously measured.

Japanese Patent Application Publication No. 2015-021905

The agitator car is equipped with a chute shaped like a gutter through which the fluid flows. The chute has an open channel. According to the method described in Patent Document 1, a rod-shaped microwave sensor used as a moisture meter is set for a fluid flowing on a chute, and the unit water volume of the fluid is estimated. However, the measurement method described in Patent Document 1 has the problem that the microwave sensor needs to be reset every time the agitator car is replaced, which is time-consuming. Furthermore, according to the method described in Patent Document 1, there is a problem that when the flow rate of the fluid changes significantly, the peak value of the resonance frequency of the microwave changes, and the dynamic measurement value becomes unstable.

An object of the present invention is to provide a measuring device that can stably measure a unit water amount even if the flow rate of a fluid containing fresh concrete or fresh mortar changes.

In order to achieve the above object, the present invention provides a measuring device for measuring the unit water volume of a fluid containing fresh concrete or fresh mortar, in which the fluid flows and is formed into a cylindrical shape, and the properties of the fluid are Accordingly, a flow channel having an opening with an adjusted area and an adjusted gradient at the outlet, and a flow rate provided in the flow channel to continuously measure the unit water volume of the fluid flowing through the flow channel. A measuring device comprising: a meter;

According to the present invention, since the fluid is allowed to flow while filling the cylindrical channel, the unit water amount of the fluid can be stably measured. Since the area of the opening at the outlet of the flow path is adjusted according to the properties of the fluid, the flow rate of the fluid in the flow path can be adjusted. Furthermore, since the gradient of the flow path is adjusted according to the properties of the fluid, the flow rate of the fluid in the flow path can be adjusted. According to the present invention, even if the agitator wheel is changed, the unit water amount of the fluid can be stably measured.

Further, in the flow path of the present invention, the area and the slope of the opening may be adjusted depending on the slump value of the fresh concrete or the fluidity of the fresh mortar.

According to the present invention, the area of the opening of the flow path is adjusted specifically according to the slump value of fresh concrete or the fluidity of fresh mortar, and the slope of the flow path is adjusted. It is possible to discharge the fluid while receiving the fluid at the opening, thereby filling the inside of the channel with the fluid.

In addition, the flow path of the present invention may be arranged such that the gradient of the flow path is adjusted according to the properties of the fluid so that the fluid flows within a predetermined flow rate range after a predetermined time has elapsed from the start of the flow of the fluid. It may be provided with an adjustment mechanism for adjusting.

According to the present invention, the gradient is adjusted so that the fluid is received in the opening of the channel that is adjusted according to the properties of the fluid, and the fluid is filled into the channel after a predetermined time has elapsed. The fluid in the flow path can be made to flow within a predetermined flow rate range.

Further, the flowmeter of the present invention includes a microwave sensor having a detection part formed in a predetermined area, and the detection part is arranged on the bottom surface of the flow path so that the fluid in contact with the fluid reaches a certain amount. A portion may be provided on substantially the same surface as the bottom surface.

According to the present invention, since the fluid flows through the flow path at a flow rate within a predetermined range, the fluid can be brought into stable contact with the detection section of the flowmeter.

Further, in the present invention, the unit water amount of the fresh concrete or the fresh mortar may be calculated based on the detection result of the microwave sensor.

According to the present invention, since the detection value of the microwave sensor can be stably detected, the calculation result of the unit water amount of the fluid can be stabilized based on the detection result.

According to the present invention, even if the state or flow rate of the fluid containing fresh concrete or fresh mortar changes, the unit water volume of the fluid can be stably measured.

1 is a diagram showing a usage state of a measuring device according to an embodiment of the present invention. FIG. 2 is a side view showing the configuration of the measuring device. FIG. 2 is a front view showing the configuration of the measuring device. FIG. 2 is a plan view showing the configuration of a measuring device. FIG. 3 is a perspective view showing the configuration of a pedestal. FIG. 3 is a diagram showing the configuration of a flow path. It is a figure showing the composition of the adjustment mechanism which adjusts the angle of a pedestal. FIG. 2 is a side view showing the configuration of a flowmeter. FIG. 2 is a perspective view showing the configuration of a flowmeter. It is a figure showing the measurement result of a measuring device.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a measuring device according to the present invention will be described with reference to the drawings. The measuring device measures the unit water amount of a fluid containing fresh concrete or fresh mortar, such as ready-mixed concrete, which has been mixed in advance at a predetermined mixing ratio.

As shown in FIG. 1, the measuring device 1 is disposed, for example, between a chute S of an agitator vehicle A and a hopper H provided at the rear of a concrete pump vehicle B. The chute S is a channel for a fluid such as concrete formed in the shape of a gutter. The chute S receives concrete supplied from the agitator vehicle A at one end, and feeds the concrete into the moving target from the other end. The hopper H is a device configured to temporarily receive the introduced fluid and flow it to a target position. The measuring device 1 measures the unit water volume of the fluid when concrete or the like flows between the chute S and the hopper H.

As shown in FIGS. 2 to 5, the measuring device 1 includes a channel 2 through which a fluid flows, a pedestal 20 on which the channel 2 is placed, and legs 10 that support the pedestal 20. The leg portion 10 is assembled with, for example, a plurality of pipes for scaffolding and a plurality of connecting fittings. The leg portion 10 is formed so that legs provided on the front side (on the side of the input section 24 described later) and legs on the rear side (on the side of the flat plate portion 23 described later) are alternately extendable and contractible.

The pedestal 20 is formed into an inverted trapezoidal plate shape in which the downstream side is shorter than the upstream side when viewed from above. A flat plate portion 23 is rotatably connected to the upstream side of the pedestal 20. The flat plate portions 23 are connected by a hinge Q. The flat plate portion 23 includes a bottom plate 23A and a pair of side plates 23B and 23C that stand up to surround the bottom plate 23A. A pair of side plates 23B and 23C are provided to prevent concrete from leaking. The pair of side plates 23B may be formed of a metal plate or may be formed of a thick rubber plate. A charging section 24 for charging the fluid into the hopper H is attached to the downstream side of the pedestal 20. The input portion 24 is formed in the shape of a gutter with an open top surface.

The pedestal 20 is provided with a pair of guide plates 21 that guide the fluid to the upstream opening of the flow path 2 . The pair of guide plates 21 are attached such that the distance between them becomes narrower toward the upstream opening of the flow path 2 . When the fluid is introduced from above the pair of guide plates 21, the fluid flows along the pair of guide plates 21 and is guided to the opening at the upper end of the channel 2. Even if the flow rate of the fluid increases and the fluid on the upstream side of the guide plate 21 overflows, the side plates 23B and 23C catch the concrete in the flat plate portion 23, so that the concrete is prevented from spilling. The length of the guide plate 21 is adjusted as appropriate. The length of the guide plate 21 may be about half of the illustrated length. A pair of reinforcing plates 22 are provided on both sides of the pedestal 20 and erected upward. A flow path 2 is fixed on the pedestal 20.

As shown in FIG. 6, the flow path 2 is formed into a cylindrical shape with a rectangular cross section of 10 cm x 15 cm, for example. A fluid flows within the flow path 2 . For example, a tapered portion 2B is provided at the downstream opening 2A of the flow path 2. The tapered portion 2B is formed such that its cross-sectional area decreases toward the downstream side from one end. An opening 2C with a rectangular cross section is formed at the exit of the tapered portion.

The area of the opening 2C is adjusted depending on the properties of the fluid. The area of the opening 2C is adjusted depending on, for example, the slump value and fluidity of fresh concrete or fresh mortar. The opening 2C is formed such that, for example, when fresh concrete flows through the channel, the area becomes larger as the slump value becomes smaller. That is, the opening 2C is set to have an area inversely proportional to the slump value. In other words, the area of the opening 2C is formed to be large when the fluidity of fresh concrete is high, and to be small when the fluidity of fresh concrete is low.

The area of the opening 2C is, for example, 8 cm x 8 cm when the slump value of fresh concrete is about 15 cm. The area of the opening 2C is, for example, 6 cm x 6 cm when the slump value of fresh concrete is about 21 cm. For example, in the case of mortar, the area of the opening 2C is 3 cm x 3 cm. Tapered portion 2B may not be provided if the slump value of fresh concrete is 12 cm or less, and fresh concrete is discharged from the area (10 cm x 15 cm) of opening 2A.

The flow path 2 is an adjustment mechanism that adjusts the slope of the flow path 2 (pedestal 20) according to the properties of the fluid so that the fluid flows within a predetermined flow rate range after a predetermined time has elapsed from the start of the flow of the fluid. 5.

As shown in FIG. 7, the adjustment mechanism 5 is configured to, for example, adjust the slope of the pedestal 20 in multiple stages. The adjustment mechanism 5 includes an arm portion 6 provided on the bottom surface of the pedestal 20, a protrusion portion 7 provided on the bottom surface of the flat plate portion 23, and a connecting member 8 that connects the tip of the arm portion 6 and the protrusion portion 7. A hinge 9 provided on the bottom surface of the flat plate portion 23 is provided. The arm portion 6 is formed into a plate shape.

The arm portion 6 is formed by cutting out a metal plate so as to hang downward from the bottom surface of the pedestal 20 and bend in the direction of the flat plate portion 23 . A bolt hole is formed at the tip of the arm portion 6. The protruding portion 7 is formed by cutting out a metal plate so as to hang downward from the bottom surface of the flat plate portion 23 . A bolt hole is formed at the tip of the protrusion 7. The connecting member 8 is formed into a rectangular plate-like body. A plurality of bolt holes 8A are formed in the connecting member 8 along the longitudinal direction. One end side of the connecting member 8 is fixed to the protrusion 7 with a bolt and a nut.

The other end of the connecting member 8 is fixed to the arm portion 6 with bolts and nuts. In this state, the inclination of the channel 2 and the pedestal 20 is fixed to be horizontal. The connecting member 8 is fixed to the tip of the arm portion 6 with a bolt and a nut by changing the mounting position of the bolt hole from one end side to the other end side. The hinge 9 rotatably connects the pedestal 20 to the leg portion 10.

As shown in FIG. 7(A), in the adjustment mechanism 5, when the mounting position of the bolt hole in the connecting member 8 of the arm portion 6 is shifted by one position from the other end toward the one end and fixed, the pedestal 20 and the flat plate are fixed. The angle formed with the portion 23 is fixed at 15°. When the flat plate part 23 is kept horizontal and the pedestal 20 is fixed to the leg part 10, the flow path 2 is fixed at an inclination of 15 degrees.

As shown in FIG. 7(B), in the adjustment mechanism 5, the arm part 6 and the protruding part 7 are separated from each other as the mounting position of the bolt hole in the connecting member 8 of the arm part 6 moves from the other end side to the one end side. If it is further shifted by one position in the direction and fixed, the angle between the pedestal 20 and the flat plate part 23 is fixed at 30°. When the flat plate part 23 is kept horizontal and the pedestal 20 is fixed to the leg part 10, the flow path 2 is fixed at an inclination of 30 degrees.

As shown in FIG. 7(C), in the adjustment mechanism 5, the arm part 6 and the protruding part 7 are separated from each other as the mounting position of the bolt hole in the connecting member 8 of the arm part 6 moves from the other end side to the one end side. If it is further shifted by one position in the direction and fixed, the angle between the pedestal 20 and the flat plate part 23 is fixed at 45°. When the flat plate part 23 is kept horizontal and the pedestal 20 is fixed to the leg part 10, the flow path 2 is fixed at an inclination of 45 degrees. When the pair of side plates 23B of the flat plate part 23 are formed of thick rubber plates, they are connected to the pair of reinforcing plates 22 and are configured to elastically deform according to changes in the angle between the base 20 and the flat plate part 23. It's okay. The configuration of the adjustment mechanism 5 described above is an example, and other sizes and other mechanisms may be applied as long as the slope of the pedestal 20 can be adjusted.

The slope of the flow path 2 is adjusted so that the value increases in inverse proportion to the magnitude of the slump value of the concrete. For example, when the slump value of concrete is large, the slope of the flow path 2 is adjusted so that the slope becomes small. For example, when the slump value of concrete is small, the slope of the flow path 2 is adjusted so that the slope becomes large. With the above configuration, in the flow path 2, the area and slope of the opening 2C of the tapered portion 2B are adjusted according to the properties of the concrete.

For example, when the fresh concrete has a slump value of about 21 cm and has high fluidity, the flow path 2 is provided with a tapered portion 2B having an opening 2C with an area of 6 cm x 6 cm, and the slope is adjusted to 15°. For example, in the case of highly fluid mortar, the flow path 2 is provided with a tapered portion 2B having an opening 2C with an area of 3 cm x 3 cm, and the slope is adjusted to 15°.

For example, when the slump value of fresh concrete is about 15 cm, the flow path 2 is provided with a tapered portion 2B having an opening 2C with an area of 8 cm x 8 cm, and the slope is adjusted to 30°. For example, if the fresh concrete has a slump value of 12 cm or less and has low fluidity, the flow path 2 is adjusted so that the tapered portion 2B is removed, the area of the opening 2A is adjusted to 10 cm x 15 cm, and the slope is adjusted to 45°. The area and slope of the opening described above are merely examples, and the combination and numerical value of the area and slope may be adjusted as appropriate.

As shown in FIGS. 8 and 9, a flow meter 30 is provided in the middle of the bottom surface 2D of the flow path 2 to continuously measure the unit water volume of the fluid flowing through the flow path. The flow meter 30 includes a microwave sensor having a disc-shaped detection section 31 formed in a predetermined area. The detection unit 31 is provided on a portion of the bottom surface 2D of the channel on substantially the same surface as the bottom surface 2D so that a constant amount of fluid comes into contact with the detection section 31. The detection unit 31 calculates the unit water amount of fresh concrete or fresh mortar based on the detection result of the microwave sensor.

Next, detection of the unit water amount of fresh concrete or fresh mortar using the measuring device 1 will be explained. The tapered part 2B is selected depending on the properties of the fluid such as fresh concrete or fresh mortar, and is attached to the flow path 2 (see FIG. 6). The adjustment mechanism 5 is adjusted according to the properties of fresh concrete or fresh mortar to set the slope of the flow path 2 (see FIG. 7). The lower end of the chute S of the agitator car A is installed on the flat plate part 23, and the input part 24 is installed in the hopper H. The height of the measuring device is determined by adjusting the legs 10. The discharge speed of the agitator wheel A is adjusted to cause the fluid to flow through the chute S to the pair of guide plates 21 of the pedestal 20.

The fluid is received by the tapered portion 2B and discharged from the opening 2C, filling the flow path 2. After the flow path 2 is filled with the fluid, a certain amount of the fluid is discharged from the opening 2C and moves within the flow path 2 at a constant flow rate. At this time, a fixed amount of fluid flows through the detection section 31 of the flowmeter 30 per unit time.

Thereby, the flowmeter 30 measures the unit water volume of the fluid. The measuring device 1 can directly measure the unit water amount of the fluid even if the agitator car A is changed. Even if the properties of the fluid are changed, the measuring device 1 can continue measuring the unit water volume of the fluid by adjusting the taper portion 2B or the slope.

As shown in FIG. 10, the measurement results of fresh mortar by the measuring device 1 will be referred to. Until a predetermined time of about 25 seconds has elapsed from the start of the measurement, the flow path 2 is not completely filled with fresh mortar, so the measurement results are unstable. The measurement results show that after a predetermined period of time has elapsed, the discharge amount from the agitator car is 10 m ³ /h or more, and after the flow path 2 is filled with fresh mortar to the top, it is stable at any flow rate. It can be seen that dynamic measurement values are obtained.

As described above, according to the measuring device 1, even if the state or flow rate of the fluid such as fresh concrete or fresh mortar changes, the unit water amount of the fluid can be stably measured. According to the measuring device 1, the area of the opening 2C of the flow path 2 and the slope of the flow path 2 are adjusted appropriately according to the properties of the fluid, thereby controlling the flow rate of the fluid passing over the detection section 31 of the flowmeter 30. The amount of passage can be kept constant.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described one embodiment, and can be modified as appropriate without departing from the spirit thereof. For example, although a microwave sensor is used as the flowmeter, the present invention is not limited to this, and other sensors may be used as long as the unit water volume of the fluid can be estimated. Although the adjustment mechanism 5 is configured to adjust the slope of the flow path 2 in stages by changing the position of the screw hole, the present invention is not limited to this, and the adjustment mechanism 5 may be adjusted steplessly using screws, turnbuckles, etc. There may be.

1 Measuring device, 2 Channel, 2A Opening, 2B Tapered part, 2C Opening, 2D Bottom surface, 5 Adjustment mechanism, 6 Arm part, 7 Projection part, 8 Connecting member, 8A Bolt hole, 9 Hinge, 10 Leg part, 20 Pedestal , 21 guide plate, 22 reinforcing plate, 23 flat plate part, 24 input part, 30 flow meter, 31 detection part, A agitator car, B concrete pump car, H hopper, Q hinge, S chute

Claims (5)

A measuring device for measuring the unit water volume of a fluid containing fresh concrete or fresh mortar,
A channel through which the fluid flows, is formed in a cylindrical shape, and has an opening with an area adjusted at the outlet depending on the properties of the fluid, and has an adjusted gradient;
A flowmeter is provided in the flow path and continuously measures the unit water volume of the fluid flowing in the flow path.
measuring device. In the flow path, the area and the slope of the opening are adjusted according to the slump value of the fresh concrete or the fluidity of the fresh mortar.
The measuring device according to claim 1. The flow path is adjusted so that the gradient of the flow path is adjusted according to the properties of the fluid so that the fluid flows within a predetermined flow rate range after a predetermined time has elapsed from the start of the flow of the fluid. Equipped with a mechanism,
The measuring device according to claim 1 or 2. The flowmeter includes a microwave sensor having a detection portion formed in a predetermined area,
The detection unit is provided on a part of the bottom surface of the flow path on substantially the same plane as the bottom surface so that the fluid in contact with the fluid reaches a certain amount.
The measuring device according to any one of claims 1 to 3. calculating the unit water volume of the fresh concrete or the fresh mortar based on the detection result of the microwave sensor;
The measuring device according to claim 4.

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