JP4099625B2 - Concrete material measuring device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an aggregate having different surface water states and a concrete material measuring device for measuring water.
[0002]
[Prior art]
When mixing concrete on site, the amount of water has a large effect on the concrete strength and so on, so it is necessary to manage it thoroughly during mixing. However, the aggregate, which is a mixed material, has a different moisture content depending on its storage conditions and climatic conditions. When the wet aggregate is used, the amount of water in the concrete increases by the amount of surface water of the aggregate, and when the aggregate in the dry state is used, the amount of water in the concrete decreases by the effective water absorption.
[0003]
For this reason, it is extremely important to maintain the quality of concrete by correcting the amount of water at the time of mixing according to the degree of dryness and wetness of the aggregate and producing concrete as indicated.
[0004]
Here, the ratio of the amount of surface water in the wet state (the amount of water adhering to the surface of the fine aggregate) divided by the mass of the fine aggregate in the surface dry state (surface dry saturated state) is called the surface water ratio. However, since stored aggregates, especially fine aggregates, are often wet, the surface water ratio is measured in advance as an indicator of the degree of dryness and wetness of the aggregates, and is mixed based on the measured values. It is common to adjust the amount of water.
[0005]
And, the measurement of such a surface water ratio is to collect a small amount of sample from a storage container called a stock bottle in which fine aggregates are conventionally stored, measure its mass and the mass in an absolutely dry state, It calculated using these measured values and the water absorption of the surface dry state measured beforehand.
[0006]
[Problems to be solved by the invention]
However, with such a measurement method, the overall surface water ratio is only estimated from a small number of samples, so there is a limit in terms of accuracy. Therefore, it has been unrealistic in terms of economy and time to collect an amount close to the amount actually used and use it as a sample.
[0007]
In addition, in order to make up for such a problem, there are cases where an operator visually confirms the mixing state or adjusts the mixing water amount by referring to the load current of the mixer, but such a method may be adopted. The method itself has low accuracy, and eventually, a large safety factor of about 20% in terms of strength has to be expected, resulting in a problem that the composition becomes uneconomical.
[0008]
The present invention has been made in consideration of the above-described circumstances, and an object of the present invention is to provide a concrete material measuring device capable of accurately measuring the mass of aggregate and water.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, a concrete material measuring apparatus according to the present invention is supplied from aggregate supply means for supplying aggregate, water supply means, and aggregate supply means as described in claim 1. A measuring tank in which an aggregate is accommodated as water-immersed aggregate together with water supplied from the water supply means, and a bottom lid capable of maintaining watertightness is attached to the bottom opening so as to be openable and closable, and water-immersed bone in the measuring tank Water immersion aggregate mass measurement means for measuring the mass of the material, water level measurement means for measuring the water level of the water immersion aggregate in the measurement tank, and the water level of the water immersion aggregate in the measurement tank to a desired water level A water level holding means for absorbing water from the measuring tank and measuring the amount of water absorbed, the water level holding means being configured to freely move up and down, and the water absorption pipe. A water absorption meter that measures the amount of absorbed water connected to a pipe To use the reservoir and reservoir for absorbing water weighing which is constituted by the communicating connected inlet means.
[0010]
In the concrete material measuring apparatus according to the present invention, the water level measuring means is composed of an electrode type sensor, and the electrode type sensor is fixed to the water absorption pipe so that the electrode type sensor can be moved up and down in conjunction with the water absorption pipe. It is comprised as follows.
[0011]
In the concrete material measuring apparatus according to the present invention, the electrode-type sensor is disposed in a hollow tube and fixed to the water absorption tube together with the hollow tube, and vertically downward low-pressure air flows in the hollow tube. Low-pressure air introduction means is provided at the upper end of the hollow tube.
[0012]
In addition, the concrete material measuring apparatus according to the present invention includes cleaning water spraying means capable of spraying cleaning water to the upper surface of the bottom cover from a cleaning nozzle attached in the vicinity of the bottom cover. The cleaning water spraying unit is connected to the cleaning water storage tank connected to the cleaning nozzle, the cleaning water supply unit connected to the cleaning water storage tank, and the cleaning water storage tank through a switching valve. And a compressor connected to the high-pressure air tank, and the switching valve is communicated with the high-pressure air tank at the first switching position. It is configured to communicate with the atmosphere at the switching position.
[0013]
Further, the concrete material measuring apparatus according to the present invention includes two different lengths so that the bottom cover and the measuring tank body rotate while the bottom cover moves to the side of the measuring tank body. It is connected with a link member, and a predetermined bottom lid opening / closing actuator is installed on the side surface of the weighing tank main body so as to be fixed at the lower end thereof. The connected lifting rod is connected to the tip of the lifting rod through a predetermined connecting member, and the connecting member is slidable along a vertical guide body protruding from the side surface of the measuring tank body. A member is fitted to the vertical guide body.
[0014]
In the concrete material measuring apparatus according to the present invention, the water level holding means includes a water absorption pipe installed to be movable up and down, a water absorption measurement storage tank connected to the water absorption pipe and measuring the water absorbed, and the water absorption measurement The intake means communicated with the storage tank, and when water and aggregate are put into the measurement tank, the water level of the water-immersed aggregate in the measurement tank The water inlet provided at the lower end of the water absorption pipe is positioned so that the height is maintained at a desired water level.
[0015]
In this way, after the water-immersed aggregate in the measuring tank reaches a desired water level, excess water exceeding the desired water level is absorbed by the intake means through the water absorption pipe, and thus the metering The volume of the water-immersed aggregate in the tank is maintained at a predetermined volume.
[0016]
In addition, it is confirmed separately by a water level measurement means whether the water level in a measuring tank is a desired water level.
[0017]
Moreover, since the water absorbed through the water absorption pipe is stored in the water absorption storage tank, if the mass is measured, the surface water ratio of the aggregate can be accurately obtained as will be described later. .
[0018]
Thus, if the surface water ratio is calculated, it can be appropriately reflected in the setting of the surface water ratio in the next measurement work.
[0019]
Although the aggregate is mainly intended for fine aggregate, it goes without saying that it can also be applied to coarse aggregate. In addition, the aggregate may be fine aggregate or coarse aggregate as described above, but the material constituting the concrete actually requires fine aggregate and coarse aggregate. As for the materials, it is assumed that a plurality of materials having different densities or different particle sizes are used. In particular, it is often important for the mixing of concrete to newly produce an aggregate having a desired particle size by mixing a plurality of aggregates having different particle sizes at an appropriate ratio.
[0020]
The concrete material measuring apparatus according to the present invention can measure not only a single type of aggregate, but also a plurality of aggregates that are mainly different from each other in at least one of density and particle size, for example, in a cumulative measurement system.
[0021]
In addition, when referring to a plurality of aggregates in the present invention, it includes all cases where all are fine aggregates, all are coarse aggregates, and cases where fine aggregates and coarse aggregates are arbitrarily included. Shall. In addition, as described above, a plurality of aggregates include those with different densities and particle sizes, as well as locality, strength, Young's modulus, durability, natural aggregate, artificial aggregate, by-product aggregate, or natural bone. The production status of whether it is sea sand or mountain sand and other classification indexes related to aggregates are different.
[0022]
For example, ΣM _i When expressed as (i = 1,2,3, ... N), the sum, ie, M ₁ + M ₂ + ... M _N . When the i-th (i = 1, 2, 3,... N) aggregate is indicated, the first aggregate, the second aggregate, the third aggregate,. Means aggregate.
[0023]
As long as the measuring tank can accommodate the water-immersed aggregate, the shape of the measuring tank is arbitrary. For example, the measuring tank may be a hollow cylindrical shape. Since the inner diameter becomes larger, there is no possibility that the water-immersed aggregate is clogged in the middle, and when the measurement is completed, the water-immersed aggregate can be freely dropped and easily taken out by simply opening the bottom cover.
[0024]
If the water-immersed aggregate cannot be completely dropped freely due to aggregate adhesion to the inner surface of the measuring tank or compaction of the aggregate, a vibration imparting device such as a vibrator or knocker should be installed on the side of the measuring tank. It is only necessary to attach it appropriately.
[0025]
Moreover, if the predetermined vibrator is set up and down freely above the measuring tank and is installed so as to be buried in the water-immersed aggregate at the lowered position, the vibrator is lowered during or after the addition of the aggregate, By operating the vibrator in such a state, the aggregate put into the measuring tank is flattened by vibration, and there is no possibility that the aggregate comes out on the water surface.
[0026]
The volume of the measuring tank is arbitrary, and may be a unit for mixing concrete, that is, the total amount required for one batch, or may be measured in several times.
[0027]
The water-immersed aggregate mass measuring means can be constituted by a load cell, for example.
[0028]
The water level measuring means may be constituted by any means as long as it can measure the water level in the measuring tank, but the water level measuring means is constituted by an electrode type sensor and the electrode type sensor is fixed to the water absorption pipe. If the electrode type sensor can be moved up and down in conjunction with the water absorption pipe, a mechanism for raising and lowering the electrode type sensor can be omitted.
[0029]
Further, such an electrode type sensor is disposed in the hollow tube and fixed to the water absorption tube together with the hollow tube, and low-pressure air is provided at the upper end of the hollow tube so that vertically downward low-pressure air flows in the hollow tube. If the introducing means is provided, the bubbles generated on the water surface in the measuring tank can be removed with a low-pressure air flow, so that the measurement accuracy of the electrode sensor can be improved. In addition, if the position was set so that the lower end of the hollow tube sinks slightly below the water surface of the water-immersed aggregate at the position where the lower end of the electrode-type sensor contacts the water surface of the water-immersed aggregate, it was once removed. There is no risk of bubbles collecting again at the lower end of the electrode sensor.
[0030]
The bottom lid may be of any structure as long as it can open and close the bottom opening of the weighing tank body and can maintain water tightness in the closed state, but the bottom lid and the weighing tank body may be connected to the bottom lid. Is connected by a predetermined link member so as to rotate while moving to the side of the weighing tank body, and a predetermined bottom lid opening / closing actuator is fixed to the side surface of the main body at its lower end. The tip of the piston rod of the bottom lid opening / closing actuator and the tip of the lifting rod pin-joined to the bottom lid are connected via a predetermined connecting member, and the connecting member protrudes from the side of the main body. If the connecting member is fitted to the vertical guide body so as to be slidable along the vertical guide body, a lower space in the height direction necessary for completely opening the bottom cover can be suppressed. Together, it is possible to stabilize the bottom cover opening and closing operation.
[0031]
That is, in the conventional opening / closing type, since the bottom lid hangs down when the bottom lid is opened, it is necessary to secure a lower space in the height direction by that amount. In the present invention, such opening / closing is required. Since the lower space in the height direction can be suppressed, the bottom opening of the measuring tank main body can be lowered by that amount, and the charging into the kneading mixer can be reliably performed.
[0032]
In addition, since the bottom lid and the measuring tank main body are connected by two link members having different lengths, the bottom lid goes around the side of the measuring tank main body when the bottom lid is pushed down by the lifting rod. However, when the bottom lid is pulled up by the lifting rod, the posture is substantially parallel to the bottom opening of the measuring tank body immediately before the bottom lid is closed. Therefore, almost equal pressure acts on the sealing material provided in the bottom opening or the bottom lid, and it is possible to ensure uniform water tightness along the bottom opening, and partial damage to the sealing material. Can also be prevented.
[0033]
Further, the apparatus includes cleaning water spraying means capable of spraying cleaning water onto the upper surface of the bottom cover from a cleaning nozzle attached in the vicinity of the bottom cover, and the cleaning water spraying means includes the cleaning water spraying means. Wash water storage tank connected to the nozzle, wash water supply means connected to the wash water storage tank, high pressure air tank connected to the wash water storage tank via a switching valve, and the high pressure air tank And the switching valve is connected to the high-pressure air tank at the first switching position and to the atmosphere at the second switching position. In such a case, the compressor is driven in advance to accumulate high-pressure air in the high-pressure air tank, and the washing water supply means supplies the washing water storage tank. Keep transferring the amount of wash water. When accumulating high-pressure air and transferring cleaning water, the switching valve is switched to the second switching position where the cleaning water storage tank does not communicate with the high-pressure air tank but communicates with the atmosphere.
[0034]
Next, after the water-immersed aggregate that has been weighed has been opened and dropped onto the mixer below, the switching valve is switched to the first position.
[0035]
In this way, the high-pressure air accumulated in the high-pressure air tank is sent to the wash water storage tank, and the wash water in the tank is ejected from the wash nozzle at that pressure.
[0036]
Therefore, even if the aggregate adheres to the upper surface of the bottom lid when the water-immersed aggregate is discharged, the aggregate is washed with the above-mentioned washing water and blown away, so that the bottom lid is closed for the next measurement. However, the aggregate is not sandwiched between the measuring tank body and the bottom lid.
[0037]
Therefore, it is possible to prevent the occurrence of errors in measurement due to water leakage from the gap generated by the aggregate being sandwiched, and also damage the sealing member provided on the measuring tank main body and the bottom cover. Absent.
[0038]
Next, a procedure for measuring a plurality of aggregates using the concrete material measuring apparatus according to the present invention will be described. In the case of a single aggregate, N may be read as 1 in the following description.
[0039]
First, the target mass M of the water-immersed aggregate at the time when the introduction of the i-th (i = 1, 2, 3... N) aggregate is completed. _di Set (i = 1,2,3 ... N).
[0040]
Next, the first aggregate and water are put into the measuring tank so that the first aggregate becomes a water-immersed aggregate that does not come out of the water surface.
[0041]
It is optional to put the aggregate and water into the measuring tank, but it is optional, but if water is put in first and then the aggregate is thrown in, it will be submerged especially in the case of fine aggregate. It becomes possible to considerably suppress the mixing of bubbles into the aggregate.
[0042]
Next, the total mass M of the water-immersed aggregate _f1 Measure. Total mass M of water-immersed aggregate _f1 Can be measured by subtracting the mass of the weighing tank alone from the mass of the weighing tank when filled with water-immersed aggregate.
[0043]
Next, the density ρ of the first aggregate in the surface dry state _a1 And water density ρ _w The total mass M of the water-immersed aggregate _f1 And the total volume V of the submerged aggregate required for the first water level, which is a preset desired water level. _f1 Together with the following formula,
M _a1 = Ρ _a1 (M _f1 −ρ _w ・ V _f1 ) / (Ρ _a1 −ρ _w (1)
The mass M of the first aggregate in the surface dry state _a1 Ask for.
[0044]
Next, in the same manner as the first aggregate, the second aggregate is put into the measuring tank so that the second aggregate becomes a submerged aggregate that does not come out of the water surface, and then the submerged aggregate. Total mass M _f2 Measure.
[0045]
Next, the density ρ of the first aggregate in the surface dry state _a1 The density ρ of the second aggregate in the surface dry state _a2 And water density ρ _w The total mass M _f2 And the total volume V of the water-immersed aggregate required for the second water level, which is a preset desired water level. _f2 Together with the following formula:
M _a2 = Ρ _a2 ((M _f2 -M _a1 ) −ρ _w (V _f2 -M _a1 / Ρ _a1 )) / (Ρ _a2 −ρ _w (2)
Substitute for the mass M of the second aggregate in the dry state _a2 Ask for.
[0046]
Thereafter, the above procedure is repeated, and the mass M of the (N-1) th aggregate in the surface dry state _{a (N-1)} Are sequentially calculated, and finally, the Nth aggregate is put into a measuring tank so that the Nth aggregate becomes a submerged aggregate that does not come out of the water surface.
[0047]
Next, as described above, the total mass M of the water-immersed aggregate _fN Measure.
[0048]
Next, the density ρ in the surface dry state of the i-th aggregate (i = 1,2,3, ... N) _ai (i = 1,2,3, ... N) and water density ρ _w The total mass M _fN And the total volume V of the submerged aggregate required for the Nth water level preset as the desired water level _fN Together with the following formula,
M _aN = Ρ _aN ((M _fN -ΣM _ai (i = 1,2,3, ... (N-1)))-ρ _w (V _fN -Σ (M _ai / Ρ _ai ) (i = 1,2,3, ... (N-1)))) / (ρ _aN −ρ _w (3)
M _w = Ρ _w (Ρ _aN (V _fN -Σ (M _ai / Ρ _ai ) (i = 1,2,3, ... (N-1)))-(M _fN -ΣM _ai (i = 1,2,3, ... (N-1)))) / (ρ _aN −ρ _w (4)
The mass M in the dry state of the Nth aggregate by substituting _aN And water mass M _w Ask for.
[0049]
Here, when the i-th (i = 1,2,3... N) aggregates are progressively charged into the weighing tank, the i-th (i = 1,2,3,.・ Total mass M of water-immersed aggregate while continuously or intermittently feeding N) aggregate _fi (i = 1,2,3... N) is measured in real time or at a predetermined time interval, and among the i-th (i = 1,2,3... N) aggregates, the j-th aggregate During the charging, the total mass M of the submerged aggregate is absorbed while absorbing excess water so that the water level of the submerged aggregate does not exceed the preset jth water level. _fj Is the target mass M _dj Is reached, the j-th aggregate charging is finished.
[0050]
On the other hand, when it is confirmed by the water level measuring means that the water level of the water-immersed aggregate at that time does not reach the preset j-th water level, the water level is replenished to the j-th water level. Total mass M of the water-immersed aggregate _fj Re-measurement, mass M of the j-th aggregate in the dry state _aj Recalculation and the mass M of the water _w Perform the recalculation.
[0051]
If there are aggregates to be successively added, that is, if there are a plurality of aggregates to be added and not the last aggregate, the (j + 1) th (j + 1) th is performed in the same manner as described above. Continue to introduce aggregates.
[0052]
In this way, if the i-th (i = 1,2,3... N) aggregate and water are weighed, other concrete materials such as cement and admixture are also weighed appropriately, and kneading mixer together with these The total mass M of the water-immersed aggregate is drained while draining excess water so that the water level of the water-immersed aggregate does not exceed the preset j-th water level. _fj Is the target mass M _dj Is reached, the surface mass M of the i-th aggregate is dry _ai (i = 1, 2, 3... N) is equal to the initially set value, so there is no need to modify the on-site recipe.
[0053]
On the other hand, when the water level of the water-immersed aggregate does not reach the preset j-th water level, water is replenished so as to reach the j-th water level. Mass M _aj Is different from the value originally set. Therefore, the measurement result is compared with the initial on-site composition set according to the indicated composition, and the on-site composition is corrected as necessary. That is, the measured aggregate mass is compared with the initially set aggregate mass of the on-site mixture, and the mixing amount of one batch is corrected according to the ratio, and the shortage of water is determined according to the ratio. Replenish as secondary water or drain the excess water, measure other concrete materials such as cement and admixtures according to the above-mentioned ratios, modify the original on-site blending, and feed them to the kneading mixer Add and knead.
[0054]
As described above, the surface water of the aggregate is the mass M of the water in a state in which the variation between the aggregates in different wet states is considered. _w The mass of the aggregate is the mass M in the surface dry state. _ai (i = 1,2,3, ... N) In other words, since the mass of aggregate and water is grasped under the same conditions as the formulation, concrete can be produced according to the formulation even if aggregates with different wet states are used.
[0055]
Also, the total mass M of the water-immersed aggregate _fj Is the target mass M _dj When the water level of the submerged aggregate is not reached the preset j-th water level, the j-th aggregate input is terminated. The total mass M of the water-immersed aggregate after replenishing _fj Re-measurement, mass M of the j-th aggregate in the dry state _aj Recalculation and the mass M of the water _w The total capacity V of the water immersion aggregate is _fi The measurement of (i = 1,2,3 ... N) does not need to be measured as a known value, and the i-th (i = 1,2,3 ... N) aggregate is input. The amount can be accurately controlled, and as a result, it is possible to produce concrete as shown.
[0056]
In addition, even in the case of multiple aggregates with different densities, particle sizes, etc., the effect of surface water due to the difference in wet conditions can be accurately grasped as part of the final water volume, This makes it possible to measure efficiently and with high accuracy.
[0057]
In this measuring method, the amount M of water supplied to the measuring tank _I Is measured in advance, the amount of water absorption M from the measuring tank measured in the storage tank for measuring water absorption. _O It is possible to accurately calculate the surface water ratio of the aggregate using the accumulated value of.
[0058]
That is, water supply amount M to the measuring tank _I , Water absorption M from the measuring tank _O And total mass M _fi (i = 1,2,3 ... N)
ΣM _awj (j = 1,2,3, ... i) = M _fi -(M _I -M _O (5)
Substituting for ΣM _awj (j = 1,2,3, ... i)
ΣM _awj (j = 1,2,3, ... i) -ΣM _awj (j = 1,2,3, ... (i-1)) (6)
And M _awi With the following formula:
(M _awi -M _ai ) / M _ai (7)
By substituting for, the surface water ratio of the i-th (i = 1, 2, 3,... N) aggregate can be obtained.
[0059]
Here, water supply amount M to the measuring tank _I The cumulative value does not always increase, and the amount of water initially added becomes the cumulative value, that is, the cumulative value may be constant without fluctuation. Also, water absorption M from the measuring tank _O Is not always absorbed, and the accumulated value may be zero.
[0060]
The amount of air in the water-immersed aggregate is a (%), and the V _fi (i = 1,2,3, ... N) instead of V _fi If (i = 1, 2, 3,... N) · (1−a / 100) is used, it is possible to measure with higher accuracy in consideration of the air amount.
[0061]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a concrete material measuring apparatus according to the present invention will be described below with reference to the accompanying drawings. Note that components that are substantially the same as those of the prior art are assigned the same reference numerals, and descriptions thereof are omitted.
[0062]
FIG. 1 is an overall view showing a concrete material measuring apparatus according to the present embodiment. As shown in the figure, a concrete material measuring apparatus 1 according to this embodiment includes an aggregate hopper 3 as an aggregate supply means for supplying fine aggregate 2 as an aggregate, and a water supply pipe 4 as a water supply means. A measuring tank 5 that houses the fine aggregate 2 supplied from the aggregate hopper 3 as a water-immersed aggregate together with water supplied from the water supply pipe 4, and measures the mass of the water-immersed aggregate in the measuring tank. The load cell 6 as the water immersion aggregate mass measurement means, the electrode type sensor 7 as the water level measurement means for measuring the water level of the water immersion aggregate in the measuring tank 5, and the water level of the water immersion aggregate in the measurement tank 5 It is generally composed of a water level holding device 8 as water level holding means for holding a desired water level.
[0063]
The aggregate hopper 3 and the load cell 6 are each attached to a gantry (not shown), and the weighing tank 5 is suspended by placing the support bracket 9 of the weighing tank 5 on the load cell, so that the mass of the weighing tank can be increased. The load cell 6 can be used for measurement. For example, it is desirable to provide the load cell 6 at three positions every 120 ° on the same horizontal plane so that the measuring tank 5 can be suspended and measured in a stable state.
[0064]
The measuring tank 5 has a bottom that closes the measuring tank body 10 formed in the shape of a hollow truncated cone so that the inner diameter increases downward and the bottom opening of the measuring tank body can be freely opened and closed while maintaining watertightness. The lid 11 is composed of a lid 11, and without dropping a vibrator or other vibration device, the bottomed lid 11 can be opened and the natural fallen by simply opening the bottom lid 11 without closing the water-immersed aggregate in the measuring tank. This can be put into a kneading mixer (not shown) together with separately weighed cement and coarse aggregate.
[0065]
The volume of the measuring tank 5 is arbitrary, and may be a unit for mixing concrete, that is, the total amount required for one batch, or may be a capacity on the premise of weighing in several times.
[0066]
At the lower end opening of the aggregate hopper 3, an elevating gate 12 that is linked to the load cell 6 is provided. By closing the elevating gate 12 according to the mass value measured by the load cell 6, the fine aggregate to the measuring tank 5 is provided. The supply of 2 can be stopped.
[0067]
A vibration feeder 13 having an electromagnetic vibrating body extending to the upper opening of the measuring tank 5 is provided immediately below the lower end opening of the aggregate hopper 3, and measurement is performed from directly below the aggregate hopper 3 using the vibration feeder. By transporting the fine aggregate 2 to the upper opening of the tank 5, the aggregate of the fine aggregate and consequently the mixing of bubbles can be prevented.
[0068]
The water supply pipe 4 is provided with a water supply valve 14, and the water supply work to the measuring tank 5 can be performed by opening and closing the valve.
[0069]
The electrode type sensor 7 is connected to a sensor control device 15 having a built-in power source, and by monitoring the change in the energized state when the lower end touches the water surface of the water-immersed aggregate contained in the measuring tank 5. The water level of the water-immersed aggregate can be measured. Here, one electrode terminal of a power source (not shown) built in the sensor control device 15 is electrically connected to the electrode type sensor 7, and the other electrode terminal is electrically connected to, for example, a steel measuring tank 5. That's fine.
[0070]
The water level holding device 8 is connected to the water absorption pipe 16 that can be moved up and down, the water absorption measurement storage tank 17 that is connected to the water absorption pipe to measure the absorbed water, and the water absorption measurement storage tank. The water intake metering storage tank 17 is configured to be able to measure the mass of water absorbed by the load cell 19.
[0071]
The water absorption pipe 16 is connected to a piston rod of a water absorption pipe raising / lowering actuator 20 attached to the side surface of the measuring tank body 10, and is configured to be movable up and down by driving the water absorption pipe raising / lowering actuator. It is desirable to employ, for example, an electric servo cylinder as the water suction pipe lifting / lowering actuator 20 in order to ensure the lifting / lowering accuracy.
[0072]
Here, the electrode sensor 7 described above is disposed in the hollow tube 21 as can be seen in FIG. 2A, and the hollow tube is fixed to the water absorption tube 16. That is, the hollow tube 21 and the electrode-type sensor 7 disposed in the hollow tube 21 are configured so as to be moved up and down by the water absorption tube lifting / lowering actuator 20 in conjunction with the water absorption tube 16.
[0073]
On the other hand, the upper end of the hollow tube 21 is connected to a low-pressure air pump 22 which is a low-pressure air introduction means via a vinyl tube, for example, and is driven vertically into the hollow tube 21 by driving the low-pressure air pump 22. Downward low-pressure air flows.
[0074]
Here, as can be seen in FIG. 3, the bottom lid 11 is connected to the side surface of the measuring tank body 10 via a link member 41 having a short length and a link member 42 longer than the link member. When the lid is pushed down, the lid can be rotated around the side of the measuring tank body 10 by a small rotation radius by the link member 41 and a large rotation radius by the link member 42.
[0075]
Further, the bottom lid opening / closing actuators 43 and 43 are installed on the side surface of the weighing tank body 10 so as to be fixed at the lower ends thereof. The tip of the pin-joined lifting / lowering rod 44 is connected via a connecting member 45, and the connecting member is slidable along a vertical guide body 46 projecting from the side surface of the measuring tank body 10. The connecting member 45 is fitted to the vertical guide body 46.
[0076]
The vertical guide body 46 can be configured by, for example, vertically welding a steel material having a T-shaped cross section to the side surface of the measuring tank body 10.
[0077]
On the other hand, the concrete material measuring apparatus 1 according to the present embodiment is provided with a cleaning water spraying device 30 as a cleaning water spraying means for spraying cleaning water on the upper surface of the bottom lid 11, and the cleaning water spraying device. 1 and 3, the cleaning nozzle 31 attached in the vicinity of the bottom lid 11, the cleaning water storage tank 33 connected to the cleaning nozzle 31 via the cleaning valve 32, and the cleaning water storage A washing water supply valve 37 as a washing water supply means connected to the tank, a flow rate adjustment valve 36, a washing water pump 35 and a washing water supply tank 34 are connected to the washing water storage tank 33 through a switching valve 38. The high-pressure air tank 39 and a compressor 40 connected to the high-pressure air tank, and the switching valve 38 connects the washing water storage tank 33 to the high-pressure air tank at the first switching position. Together to communicate with the 39 and is adapted to communicate with the atmosphere at a second switching position.
[0078]
In putting the water and fine aggregate into the measuring tank 5 in the concrete material measuring apparatus 1 according to the present embodiment, the measuring tank 5 is driven up and down in advance by driving the water-absorbing pipe raising / lowering actuator 20. The water inlet provided in the lower end of the water absorption pipe 16 is positioned so that the water level of the water-immersed aggregate inside is maintained at a desired water level. How far the water intake port of the water absorption pipe 16 should be positioned from the desired water level may be appropriately determined after performing experiments and the like.
[0079]
When the water suction port of the water suction pipe 16 is positioned in this way, when the water-immersed aggregate in the measuring tank 5 reaches a desired water level, excess water exceeding the desired water level is passed through the water suction pipe 16 through the intake fan. Thus, the volume of the water-absorbed aggregate in the measuring tank 5 is maintained at a predetermined volume.
[0080]
In addition, it is confirmed separately by the electrode type sensor 7 which is a water level measurement means whether the water level in the measuring tank 5 is a desired water level.
[0081]
As a procedure for measuring the fine aggregate 2 using the concrete material measuring apparatus 1 according to the present embodiment, the fine aggregate 2 is composed of two types of fine aggregates A and B, and these are sequentially added. An explanation will be given assuming this.
[0082]
First, the target mass M of the submerged aggregate at the time when the introduction of the fine aggregate A and the fine aggregate B is completed. _di Set (i = 1,2).
[0083]
Target mass M _di When setting (i = 1,2), first set the water-filled fine aggregate filling ratio F, which is the volume ratio of fine aggregate to the total volume of water and fine aggregate, and mix one batch. Amount N ₀ And set the water-filled fine aggregate filling rate F and the mixing amount N in one batch. ₀ The volume of the fine aggregate is set based on the above, and then the target in the dry state of the fine aggregate A and the fine aggregate B from the mixing ratio of the fine aggregate A and the fine aggregate B and the density in the dry state The input mass is determined, and then the mass in the state where the fine aggregate A is input to the first input water (primary metered water) is the target mass M of the submerged aggregate. _d1 The target mass M of the submerged aggregate is the mass of the fine aggregate B added to the submerged aggregate. _d2 Determine as The target mass M of the water-immersed aggregate _di In determining (i = 1, 2), if an appropriate surface water ratio is set as much as possible, and this is included in the primary metering water, the correction after weighing can be reduced.
[0084]
Next, the fine aggregate A and water are put into the measuring tank 5 so that the fine aggregate becomes a water-immersed aggregate that does not come out of the water surface. When the fine aggregate A and water are introduced into the measuring tank 5, it is desirable to introduce water first and then introduce the fine aggregate A in order to suppress air bubbles from entering the water-immersed aggregate. Further, if the fine aggregate A is not directly put into the measuring tank 5, but is conveyed to the measuring tank 5 using the vibration feeder 13 provided with an electromagnetic vibrator as shown in FIG. Aggregation of the material, and consequently, mixing of bubbles can be prevented.
[0085]
In addition, when throwing water and the fine aggregate A into the measuring tank 5, the water level of the water-immersed aggregate in the measuring tank 5 is set to a desired water level by appropriately raising and lowering the water absorption pipe 16 of the water level holding device 8 in advance. The water inlet provided in the lower end of the water absorption pipe 16 is positioned so that it may be hold | maintained at a certain 1st water level.
[0086]
Next, the total mass M of the water-immersed aggregate _f1 Is measured by the load cell 6. Total mass M of water-immersed aggregate _f1 Can be measured by subtracting the mass of only the measuring tank 5 from the mass of the measuring tank 5 when filled with water-immersed aggregate.
[0087]
Here, the total mass M of the water-immersed aggregate _f1 In measuring the total mass M of the water-immersed aggregate, the fine aggregate A is charged continuously or intermittently at a predetermined speed. _f1 Measurement is performed in real time or at predetermined time intervals, and the water level is maintained so that the water level of the water-immersed aggregate does not exceed the first predetermined water level as the desired water level during the introduction of the fine aggregate A Total mass M of the water-immersed aggregate while absorbing water with the device _f1 Is the target mass M _d1 When reaching the above, the introduction of the fine aggregate A is terminated.
[0088]
In addition, since the raising / lowering gate 12 provided in the lower end opening of the aggregate hopper 3 is interlocked with the load cell 6, the total mass M of the submerged aggregate M _f1 Is the target mass M _d1 Is reached, the lifting gate 12 is closed by a control signal from the load cell 6 and the fine aggregate A is automatically stopped.
[0089]
Moreover, it is confirmed separately by the electrode type sensor 7 that the water level at the end of the injection has reached the first water level, but when the water level rises by the introduction of the fine aggregate A and approaches the first water level, The low-pressure air pump 22 is operated to send low-pressure air into the hollow tube 21. In this way, as shown in FIG. 2 (b), bubbles generated on the water surface of the water-immersed aggregate escape to the periphery of the hollow tube 21, so that the water level of the water-immersed aggregate in the measuring tank 5 is When the first water level is reached, the water level can be accurately detected by the electrode sensor 7 without being disturbed by bubbles generated on the surface of the water-immersed aggregate as shown in FIG. .
[0090]
Next, the density ρ of the fine aggregate A in the surface dry state _a1 And water density ρ _w The total mass M of the water-immersed aggregate _f1 And the total volume V of the submerged aggregate required for the first preset water level. _f1 Together with the following formula,
M _a1 = Ρ _a1 (M _f1 −ρ _w ・ V _f1 ) / (Ρ _a1 −ρ _w (1)
Substitute into the mass M of fine aggregate A in the surface dry state _a1 Ask for.
[0091]
On the other hand, the total mass M of the water-immersed aggregate _f1 Is the target mass M _d1 When the electrode-type sensor 7 confirms that the water level of the water-immersed aggregate has not reached the preset first water level, water is replenished so as to reach the first water level. The total mass M of water-immersed aggregate _f1 Re-measurement and mass M of fine aggregate A in the dry state _a1 Perform the recalculation.
[0092]
Next, similarly to the fine aggregate A, the fine aggregate B is put into the measuring tank 5 so that the fine aggregate becomes a water-immersed aggregate that does not come out of the water surface.
[0093]
That is, also here, the water absorption pipe 16 is appropriately raised and lowered in advance so that the water level of the water-immersed aggregate in the measuring tank 5 is maintained at the second water level that is the desired water level. The water inlet provided at the lower end of the is positioned.
[0094]
Next, the total mass M of the water-immersed aggregate _f2 Measure. Total mass M of water-immersed aggregate _f2 Is measured, like the fine aggregate B, the total mass M of the submerged aggregate is measured while the fine aggregate B is continuously or intermittently charged at a predetermined speed. _f2 Is measured in real time or at predetermined time intervals, and the water level is maintained so that the water level of the water-immersed aggregate does not exceed the preset second water level while the fine aggregate B is being charged. The total mass M of the water-immersed aggregate while absorbing water with the device 8 _f2 Is the target mass M _d2 , The fine aggregate B is completely charged.
[0095]
As in the case of fine aggregate A, it is confirmed separately by the electrode type sensor 7 that the water level at the end of the injection has reached the second water level. When the water level approaches 2, the low-pressure air pump 22 is operated to send low-pressure air into the hollow tube 21. In this way, as described above, the water level can be accurately detected by the electrode sensor 7 without being disturbed by bubbles generated on the surface of the water-immersed aggregate.
[0096]
Next, the density ρ of the fine aggregate A in the surface dry state _a1 , Density ρ of fine aggregate B in the surface dry state _a2 And water density ρ _w The total mass M _f2 And the total volume V of the submerged aggregate required for the preset second water level. _f2 And the following formula
M _a2 = Ρ _a2 ((M _f2 -ΣM _ai (i = 1,2)) − ρ _w (V _f2 -Σ (M _ai / Ρ _ai ) (i = 1,2))) / (ρ _a2 −ρ _w (3)
M _w = Ρ _w (Ρ _a2 (V _f2 -Σ (M _ai / Ρ _ai ) (i = 1,2))-(M _f2 -ΣM _ai (i = 1,2))) / (ρ _a2 −ρ _w (4)
Substitute into the mass M of fine aggregate B in the dry state _a2 And water mass M _w Ask for.
[0097]
On the other hand, the total mass M of the water-immersed aggregate _f2 Is the target mass M _d2 When the electrode type sensor 7 confirms that the water level of the water-immersed aggregate has not reached the preset second water level, the water level is replenished to the second water level. The total mass M of water-immersed aggregate _f2 Re-measurement, mass M of fine aggregate B in the dry state _a2 And water mass M _w Perform the recalculation.
[0098]
Thus, once the fine aggregate A, fine aggregate B and water have been weighed, the measurement results are compared with the original on-site blend set according to the indicated blend, and the on-site blend is corrected as necessary. .
[0099]
That is, first, the total mass M of the submerged aggregate is absorbed while absorbing excess water so as not to exceed the first water level and the second water level. _fi (i = 1,2) is the target mass M of the submerged aggregate _d2 The total mass M of the submerged aggregate _fi (i = 1,2) and total volume of water-immersed aggregate V _fi Since (i = 1,2) is equal to the initially set value, there is no need to correct the on-site blending, and it is put into a kneading mixer together with other concrete materials and kneaded.
[0100]
On the other hand, when the water level of the water-immersed aggregate has not reached the first and second water levels set in advance, water is replenished so that the water level becomes the first and second water levels. Total mass M of material _fi (i = 1, 2) As a result, the masses of fine aggregate A and fine aggregate B in the dry state derived therefrom are also different from the initial set values.
[0101]
Therefore, in such a case, the masses of the measured fine aggregate A and fine aggregate B are compared with the masses of the initially set fine aggregate A and fine aggregate B in the field, and the set fine bone is compared. The ratio of the measured mass sum of the fine aggregates A and B to the total dry mass of the materials A and B is calculated. For example, if this is 0.9, the measured fine aggregate A is measured. , B mass is less than 10%, so 1 batch of kneading amount N ₀ 0.9% reduced by 10% ₀ Therefore, for other concrete materials such as cement and admixture, the ratio is used to modify the original on-site mix and weigh. In addition, for water, the initially set amount of water and the actually measured amount of water are compared, and the shortage is supplemented as secondary water, or the excess amount of water is drained. Then, these concrete materials are put into a kneading mixer and kneaded.
[0102]
Here, in order to open the bottom lid 11 in order to take out the water-immersed aggregate whose measurement has been completed, first, the bottom lid opening / closing actuators 43 and 43 are actuated to contract the piston rod, as described with reference to FIG.
[0103]
In this way, the connecting member 45 pin-bonded to the piston rod slides downward along the vertical guide body 46 projecting from the side surface of the measuring tank body 10, and accordingly, the connecting member 45 is pinned to the connecting member. The joined lifting rod 44 pushes down the bottom lid 11.
[0104]
On the other hand, when the pressing force by the elevating rod 44 is applied, the bottom cover 11 rotates so as to go around the side of the measuring tank body 10 as shown by the broken line in FIG. The material falls downward from the bottom opening of the weighing tank body 10.
[0105]
When the water-immersed aggregate whose measurement has been completed is put into the mixer, the bottom lid 11 is cleaned in preparation for the next measurement operation.
[0106]
That is, the compressor 40 is driven in advance to accumulate high-pressure air in the high-pressure air tank 39, and a predetermined amount of washing water is transferred from the washing water supply tank 34 to the washing water storage tank 33. When accumulating high-pressure air and transferring cleaning water, the switching valve 38 is switched to the second switching position where the cleaning water storage tank 33 does not communicate with the high-pressure air tank 39 but communicates with the atmosphere.
[0107]
Next, the water-absorbed aggregate whose measurement has been completed is opened by the procedure described above, and dropped and discharged to the lower mixer, and then the switching valve 38 is switched to the first position.
[0108]
In this way, the high-pressure air accumulated in the high-pressure air tank 39 is sent to the washing water storage tank 33, and the washing water in the tank is ejected from the washing nozzle 31 at that pressure and adheres to the upper surface of the bottom lid 11. Blow away the aggregate.
[0109]
Once the cleaning water is ejected, the switching valve 38 is switched to the second position again to accumulate high-pressure air and transfer the cleaning water to prepare for the next cleaning operation after weighing.
[0110]
As described above, according to the concrete material measuring apparatus according to the present embodiment, the surface water of the fine aggregate A and the fine aggregate B is water in a state in which variation for each aggregate having different wet states is considered. Mass M _w The mass of the aggregate is the mass M in the surface dry state. _ai (i = 1,2,3, ... N) In other words, since the mass of aggregate and water is grasped under the same conditions as the formulation, concrete can be produced according to the formulation even if aggregates with different wet states are used.
[0111]
Moreover, according to the concrete material measuring apparatus 1 according to the present embodiment, the water level of the water-immersed aggregate in the measuring tank 5 is maintained at a desired water level by appropriately raising and lowering the water absorption pipe 16 with the water level holding device 8. As described above, since the water suction port provided at the lower end of the water suction pipe is positioned, when the water-immersed aggregate in the measuring tank 5 reaches a desired water level, excess water exceeding the desired water level is Then, the water is absorbed by the intake fan 18 via the water absorption pipe 16, and thus the volume of the water-immersed aggregate in the measuring tank 5 can be held at a predetermined volume, thereby saving the labor of volume measurement. It becomes possible.
[0112]
That is, while draining excess water using the water level holding device 8 so as not to exceed the first water level and the second water level, the total mass M of the submerged aggregate M _fi (i = 1,2) is the target mass M of the submerged aggregate _d2 The total capacity of the water-immersed aggregate V _fi Not only is it unnecessary to measure (i = 1,2), but the total mass M of the water-immersed aggregate _fi (i = 1,2) and total volume of water-immersed aggregate V _fi Since (i = 1, 2) is equal to the initially set value, it is not necessary to modify the on-site blending, and it is possible to directly add it to the kneading mixer together with other concrete materials and knead.
[0113]
Moreover, according to the concrete material measuring apparatus 1 according to the present embodiment, when the water level of the water-immersed aggregate does not reach the first and second water levels set in advance, the first and second water levels are obtained. The total volume of water-immersed aggregate V _fi It is not necessary to measure (i = 1,2) as in the case described above, and the total mass M of the water-immersed aggregate _fi Re-measure (i = 1,2) to accurately control the amount of fine aggregate A and fine aggregate B and correct the on-site mix, resulting in the production of concrete as shown. Is possible.
[0114]
In addition, even in the case of multiple aggregates with different densities, particle sizes, etc., the effect of surface water due to the difference in wet conditions can be accurately grasped as part of the final water volume, This makes it possible to measure efficiently and with high accuracy.
[0115]
Further, according to the concrete material measuring apparatus 1 according to the present embodiment, the electrode type sensor 7 is disposed in the hollow tube 21 and fixed to the water absorption tube 16 together with the hollow tube 21, and Since the vertically downward low-pressure air flows, bubbles generated on the water surface in the measuring tank 5 can be removed by the low-pressure air flow, and the measurement accuracy of the electrode sensor 7 can be improved. If the position where the lower end of the hollow tube 21 is slightly submerged in the water surface of the water-immersed aggregate at the position where the lower end of the electrode-type sensor 7 is in contact with the surface of the water-immersed aggregate is removed once. There is no possibility that the bubbles again gather at the lower end of the electrode type sensor 7.
[0116]
Moreover, according to the concrete material measuring apparatus 1 according to the present embodiment, the bottom lid 11 and the measuring tank body 10 are connected by the link members 41 and 42 having different lengths, that is, rotation radii. When a pressing force is applied from the rod 44, the bottom lid 11 rotates so as to go around the side of the measuring tank body 10.
[0117]
Therefore, the lower space in the height direction necessary for completely opening the bottom lid 11 can be suppressed. That is, in the conventional opening / closing type, since the bottom lid hangs down when the bottom lid is opened, it is necessary to secure the opening / closing height of the bottom lid in the height direction accordingly. Since the lower space required for such opening and closing can be suppressed, the bottom opening of the measuring tank main body 10 can be lowered by that amount, and the charging into the kneading mixer can be reliably performed.
[0118]
Further, immediately before the bottom cover 11 is closed, the bottom cover is in a substantially parallel posture with the bottom opening of the measuring tank body 10 by the action of the two link members 41 and 42 described above. Therefore, almost equal pressure acts on the bottom opening of the weighing tank body 10 or the sealing material (not shown) provided on the bottom lid 11, and it is possible to ensure uniform water tightness along the bottom opening. In addition, it is possible to prevent partial damage to the sealing material.
[0119]
Further, according to the concrete material measuring apparatus 1 according to the present embodiment, since the cleaning water is sprayed on the upper surface of the bottom cover 11 by the cleaning water spraying apparatus 30, the bottom cover 11 of the bottom cover 11 is discharged when the water-immersed aggregate is discharged. Even if the aggregate is attached to the upper surface, the aggregate is washed with the above-mentioned washing water and blown away. Even if the bottom lid 11 is closed for the next measurement, the measuring tank body 10 and the bottom lid No aggregate is sandwiched between 11 and 11.
[0120]
Therefore, it is possible to prevent the occurrence of an error in measurement due to water leakage from the gap generated by the aggregate being sandwiched, and damage the seal member provided in the measurement tank body 10 or the bottom lid 11. There is nothing.
[0121]
Although not particularly mentioned in the present embodiment, the amount M of water supplied to the measuring tank 5 _I For example, if the load cell 6 is measured in advance, the accumulated value of the water absorbed from the measuring tank 5 can be measured by the load cell 19 of the storage tank 17 for measuring water absorption. It can measure with high accuracy.
[0122]
That is, the amount M of water supplied to the measuring tank 5 _O The amount of water absorption M from the measuring tank 5 measured by the load cell 19 _O And total mass M _fi (i = 1,2)
ΣM _awj (j = 1, ... i) = M _fi -(M _I -M _O (5)
Substituting for ΣM _awj (j = 1, ... i)
ΣM _awj (j = 1, ... i) -ΣM _awj (j = 1) (6)
And M _awi With the following formula:
(M _awi -M _ai ) / M _ai (7)
By substituting for, the surface water ratio of the fine aggregate A and the fine aggregate B can be obtained, and can be used as a set value for the next measurement.
[0123]
Although not particularly mentioned in the present embodiment, the amount of air in the water-immersed aggregate is a (%), and V _fi Instead of (i = 1,2), V _fi If (i = 1, 2) · (1−a / 100) is used, it is possible to measure with higher accuracy in consideration of the air amount.
[0124]
Although not particularly mentioned in the present embodiment, when there is a possibility that the fine aggregate put into the measuring tank 5 may come out of the water surface and not become a water-immersed aggregate, the fine aggregates A and B are added. By lowering the vibrator during or after charging and operating the vibrator in such a state, the fine aggregates A and B charged in the measuring tank 5 are leveled by vibration of the vibrator, and the fine aggregate is It can be made not to come out on the surface of the water. When measuring the mass of the water-immersed aggregate, the vibrator may be pulled up and retracted to the next measurement at the raised position.
[0125]
In the present embodiment, two types of fine aggregates have been described as examples. However, it goes without saying that the number of types of aggregates is arbitrary, and is applicable to one type of fine aggregate. Needless to say, the present invention can also be applied to only aggregates or a combination of fine aggregates and coarse aggregates.
[0126]
In the present embodiment, the load cell 6 is a compression type and the number of installation is three. However, any load cell may be used as the water immersion aggregate mass measuring means, and for example, a tension type may be used. And 4 or more may be installed. Moreover, as long as the measurement tank 5 can be stably suspended, it may be one or two.
[0127]
Further, in this embodiment, the cleaning water supply means is configured by the cleaning water supply valve 37, the flow rate adjustment valve 36, the cleaning water pump 35, and the cleaning water supply tank 34, but how the cleaning water supply means of the present invention is configured. It is optional, and instead of such a configuration, for example, a water pipe and a valve provided in the water pipe may be used.
[0128]
【The invention's effect】
As described above, according to the concrete material measuring apparatus according to the present invention, the surface water of the aggregate is the mass M of the water in a state where the variation between the aggregates in different wet states is considered. _w Can be calculated indirectly as a part of the mass, and the mass M of the aggregate in the surface dry state can be calculated. _a Can be grasped as. In other words, since the mass of aggregate and water will be grasped under the same conditions as in the indicated composition, it is possible to produce concrete with the amount of water as indicated by the indicated composition even when using aggregates with different wet conditions. .
[0129]
[Brief description of the drawings]
FIG. 1 is an overall view of a concrete material measuring apparatus according to an embodiment.
FIG. 2 is a diagram showing the operation of the electrode sensor 7, the hollow tube 21 in which the sensor is disposed, and the water absorption tube 16.
FIG. 3 is a detailed side view of the measuring tank.
[Explanation of symbols]
1 Concrete material metering device
3 Aggregate hopper (aggregate water supply means)
4 Water supply pipe (water supply means)
5 Weighing tank
6 Load cell (Measuring means for submerged aggregate mass)
7 Electrode sensor (water level measuring means)
8 Water level holding device (water level holding means)
10 Weighing tank body
11 Bottom cover
16 Water absorption pipe
17 Storage tank for water absorption measurement
18 Intake fan
19 Load cell
21 Hollow tube
22 Low pressure air pump (low pressure air introduction means)
30 Washing water spraying device (cleaning water spraying means)
31 Cleaning nozzle
33 Wash water storage tank
34 Washing water supply tank (cleaning water supply means)
38 switching valve
39 High pressure air tank
40 Compressor
41, 42 Link member
43, 43 Actuator for opening and closing the bottom cover
45 Connecting member
46 Vertical guide body

Claims (5)

Aggregate supply means for supplying aggregate, water supply means, and aggregate supplied from the aggregate supply means together with water supplied from the water supply means are accommodated as water-immersed aggregate, and the bottom opening is made watertight. A measuring tank having a bottom cover that can be held openably and closably, a water immersion aggregate mass measuring means for measuring the mass of the water immersed aggregate in the measuring tank, and a water level of the water immersed aggregate in the measuring tank Water level measuring means for measuring the water level, and in order to maintain the water level of the water-immersed aggregate in the measuring tank at a desired water level, water exceeding the desired water level is absorbed from the measuring tank and the amount of water absorption is measured. A water level holding means, wherein the water level holding means communicates with a water absorption pipe installed so as to be movable up and down, a water absorption measurement storage tank that is connected to the water absorption pipe and measures the water absorbed, and the water absorption measurement storage tank. Concrete characterized by comprising connected intake means Metering device of the door material. 2. The concrete material measurement according to claim 1, wherein the water level measuring means is constituted by an electrode type sensor and the electrode type sensor is fixed to the water absorption pipe so that the electrode type sensor can be moved up and down in conjunction with the water absorption pipe. apparatus. The electrode-type sensor is disposed in the hollow tube and fixed to the water absorption tube together with the hollow tube, and low-pressure air introduction means is provided at the upper end of the hollow tube so that vertically downward low-pressure air flows in the hollow tube. The concrete material measuring device according to claim 2. Washing water spraying means capable of spraying cleaning water onto the upper surface of the bottom cover from a cleaning nozzle attached in the vicinity of the bottom cover, the cleaning water spraying means being attached to the cleaning nozzle Connected to the wash water storage tank, wash water supply means connected to the wash water storage tank, a high pressure air tank connected to the wash water storage tank via a switching valve, and connected to the high pressure air tank The switching valve is configured to communicate the washing water storage tank to the high-pressure air tank at a first switching position and to communicate with the atmosphere at a second switching position. The metering device for concrete material according to claim 1. The bottom lid and the weighing tank main body are connected by two link members having different lengths so that the bottom lid rotates while moving to the side of the weighing tank main body, and on the side surface of the weighing tank main body. A predetermined bottom lid opening / closing actuator is installed so as to be fixed at the lower end thereof, and a tip of a piston rod of the bottom lid opening / closing actuator and a tip of a lifting rod pin-connected to the bottom lid are connected to a predetermined connecting member. And connecting the connecting member to the vertical guide body so that the connecting member is slidable along a vertical guide body projecting from a side surface of the measuring tank main body. The concrete material measuring device described.

Images