JP5139388B2 - Air mortar quality confirmation management method - Google Patents

Description

  The present invention relates to an air mortar quality confirmation management method, and more particularly to an air mortar quality confirmation management method after being kneaded by a kneading apparatus and then pumped by a pumping apparatus and placed at a placement site.

  Air mortar is a mixture of mortar formed by kneading at least cement, sand, and water with a predetermined composition, for example, foaming agent diluted water obtained by diluting a foaming agent with dilution water, together with air sent from a compressor. Is further manufactured as a lightweight mortar with a specific gravity of about 0.8 to 1.3 containing a large amount of air bubbles inside, such as backfill material and embankment in various civil engineering and construction works. It is used as a material and cavity filling material.

  When such an air mortar is used as a backfill material, embankment material, cavity filling material, etc., it is necessary to maintain a predetermined quality designed in advance, and therefore there are various methods and systems for managing the quality of the air mortar. It has been proposed (see, for example, Patent Document 1 and Patent Document 2).

Japanese Patent Laid-Open No. 6-144953 JP 2004-123876 A

  The method and system for controlling the quality of the above-mentioned air mortar can control the flow rate of the foaming agent and dilution water when adjusting the foaming agent dilution water, or blend the bubble-containing liquid into the mortar to adjust the air mortar. At the time of preparation, by controlling the supply flow rate of the foaming agent-containing liquid, air, and mortar, the blending amount of cement, sand, foaming agent, water, etc. constituting the air mortar becomes a certain ratio. However, if the quality of the air mortar is to be managed with higher accuracy, it may be insufficient to manage these blending amounts alone.

  That is, the quality of air mortar, such as specific gravity, flow value, air volume, and uniaxial compressive strength, kneading time even when the blending amount of cement, sand, foaming agent, water, etc. constituting the air mortar is constant. For example, if the flow value is insufficient, the generation of air becomes insufficient and the flow value becomes small, resulting in excessive kneading time. The generated air disappears and the flow value becomes small. For example, regarding the amount of air, if the kneading time is insufficient, the generation of air is insufficient and the amount of air decreases, and if the kneading time is excessive, the generated air disappears and the amount of air decreases. Further, for example, regarding the uniaxial compressive strength, if the kneading time is insufficient, the dispersion of air tends to be uneven and the strength tends to vary, and if the kneading time is excessive, the generated air disappears and the strength increases.

  The present invention provides an air mortar quality confirmation management method capable of confirming the change in fluidity of the air mortar accompanying a change in the length of the kneading time and managing the quality of the air mortar more accurately. Objective.

The present invention relates to a quality confirmation management method for an air mortar that is kneaded by a kneading device and then pumped by a pumping device and placed at a placement site, where the mortar stays between the kneading device and the pumping device. A rotary stirring blade is provided in the mortar staying portion, and the rotational stirring blade is rotated inside the air mortar staying in the mortar staying portion to detect the rotational resistance , whereby the pressure feeding is performed. The specific gravity of the air mortar immediately before being pumped to the placement site by the device is measured, and the air mortar is pumped while confirming the measured specific gravity immediately before being pumped, and the air kneaded by the kneading device The mortar is mixed with a predetermined composition set in advance, and the specific gravity of the air mortar immediately before being pumped to the placement site is mixed with a predetermined composition set in advance. For the amortar, the correlation between the rotational resistance by the rotary stirring blade and the specific gravity is obtained in advance, and the rotational resistance detected by rotating the rotary stirring blade inside the air mortar retained in the mortar retaining portion, By achieving a quality confirmation management method for air mortar that is designed to be measured by applying a correlation between the rotational resistance and specific gravity obtained by the rotary stirring blade obtained in advance , the above object is achieved. is there.

In the air mortar quality confirmation management method according to the present invention, the rotary stirring blade is disposed in the stirring blade installation chamber partitioned from the main body portion of the mortar retention portion by a baffle plate, and fills the stirring blade installation chamber. It is preferable that the rotation resistance is detected by rotating inside the air mortar .

In the air mortar quality confirmation management method according to the present invention, the rotary stirring blade is connected to a computer, and the detected rotational resistance and the measured specific gravity are managed by the computer. When the measured rotational resistance or measured specific gravity reaches a preset control value, a warning is issued and measures are taken early, or it is reflected in the kneading time of the air mortar in the next batch, or the pressure feeding It is preferable that the pumping of the air mortar by the pump is stopped so that the batch of air mortar can be discarded .

According to the quality confirmation management method of the air mortar of the present invention, it is possible to confirm the change in the fluidity and specific gravity of the air mortar accompanying the change in the kneading time, and to manage the quality of the air mortar more accurately. .

1 is a configuration diagram of an air mortar placement plant in which an air mortar quality confirmation management method according to a preferred embodiment of the present invention is employed. It is a schematic sectional drawing of the mortar retention part provided with the rotary stirring blade for implementing the quality confirmation management method of the air mortar which concerns on preferable one Embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic perspective view illustrating a system configuration for implementing an air mortar quality confirmation management method according to a preferred embodiment of the present invention.

  In the air mortar quality confirmation management method according to a preferred embodiment of the present invention, as shown in FIG. 1, for example, in an agricultural water use project, a construction for newly laying a piping material 21 inside an existing open channel 20 In order to fix the piping material 21 to the open channel 20 in a stable state, the air mortar 10 is manufactured as a backfill material in an air mortar placing plant and is placed around the piping material 21 installed in the open channel 20. This is employed as a method for accurately managing the quality of the air mortar 10 by confirming the change in fluidity of the air mortar 10 to be placed.

  That is, in this embodiment, the existing open channel 20 is installed on, for example, soft ground. If the specific gravity of the air mortar 10 backfilled around the piping material 21 becomes too large, the piping material 21 is shared. There is a risk that consolidation will occur later, the buoyancy applied to the piping material 21 in the open channel 20 when the air mortar 10 is placed will increase, and the fixing jig of the piping material 21 may be damaged. If the specific gravity of the mortar 10 becomes too small, there is a possibility that the air mortar 10 and the pipe material 21 as the backfill material will float together by buoyancy inside the open channel 20 when flooding after sharing, The specific gravity of the air mortar 10 needs to be managed with high accuracy so as to be, for example, 1.03 ± 0.02.

  Further, for example, regarding the uniaxial compressive strength of the air mortar 10, if the uniaxial compressive strength is low, a problem occurs in the strength as a structure, and if the uniaxial compressive strength is high, a problem occurs in the piping material 21 and the like. In this case, it becomes difficult to re-dig the air mortar 10 as the backfill material.

  Furthermore, it is known that the specific gravity of the air mortar 10 has a correlation with the fluidity of the air mortar 10 when the blending amount of cement, sand, foaming agent, water, etc. constituting the air mortar 10 is constant. It is known that the flow value, air amount, and uniaxial compressive strength of the air mortar 10 can be managed by the specific gravity of the air mortar.

  And the quality confirmation management method of the air mortar of this embodiment is made | formed based on the knowledge that the specific gravity of the air mortar 10 has a correlation with the fluidity | liquidity of the air mortar 10, and the change of the length of kneading | mixing time is carried out. Is a method for appropriately grasping the change in fluidity of the air mortar 10 and accurately controlling the quality of the air mortar 10, and after being kneaded by the agitator wheel 11 as the kneading device, the pressure feeding as the pressure feeding device. The fluidity of the air mortar 10 that is pumped by the pump 12 and is placed at the placement location is detected via the rotational resistance of the rotary stirring blade 13 (see FIG. 2). That is, in the air mortar quality confirmation management method according to the present embodiment, a mortar hopper 14 as a mortar staying part is interposed between the agitator wheel 11 and the pressure feed pump 12, and a rotating stirring blade 13 is provided in the mortar hopper 14. 2 and 3, the specific gravity of the air mortar 10 is measured by detecting the rotational resistance by rotating the rotating stirring blade 13 inside the air mortar 10 retained in the mortar hopper 14. The air mortar 10 is pumped while confirming the quality of the air mortar 10 through the measured specific gravity.

  In the present embodiment, the air mortar 10 mixed with a predetermined composition is preliminarily obtained by calibrating the correlation between the rotational resistance of the rotating stirring blade 13 and the specific gravity and is retained in the mortar hopper 14. By applying the rotational resistance detected by rotating the rotary stirring blade 13 inside the mortar 10 to the correlation between the rotational resistance of the rotary stirring blade 13 and the specific gravity determined in advance, the predetermined resistance retained in the mortar hopper 14 is obtained. The specific gravity of the air mortar 10 mixed by the formulation is measured.

  In the present embodiment, an air mortar placement plant is provided at the construction site in order to manufacture the air mortar 10 and place it in the open channel 20. This air mortar placing plant includes an agitator wheel 11, a foaming agent tank 15, a diluting water tank 16, a compressor 17, a bubble generating device 18, a pressure feed pump 12, and the like in substantially the same manner as known ones. In the present embodiment, the air mortar placing plant is provided between the agitator wheel 11 and the pressure feed pump 12, and the mortar hopper 14 is disposed below the discharge chute 11 a of the agitator wheel 11. The mortar hopper 14 is provided with a fluidity sensor unit 19 in an integrated state.

  The agitator wheel 11 constituting the air mortar placing plant is a known mixer wheel capable of producing mortar by putting cement, sand, water and the like into a rotatable mixer portion 11b and kneading. It has a function of controlling the rotation speed and rotation time of the mixer section 11b and appropriately adjusting the kneading speed and kneading time. In addition, the mortar produced by the mixer section 11b of the agitator wheel 11 is a foaming agent in which the foaming agent in the foaming agent tank 15 sent through the bubble generating device 18 is diluted with the dilution water in the dilution water tank 16. After the bubble-containing liquid for air mortar preparation obtained by mixing the foaming agent dilution water and the air sent from the compressor 17 via the gas flowmeter 22 is mixed, the mixer unit 11b is further rotated for a predetermined time to knead. Thus, the air mortar 10 in which air is generated in the mortar is manufactured.

  Here, in the present embodiment, a predetermined amount of cement, sand, water, etc., which has been measured in advance in a mortar manufacturing factory or the like, is charged into the mixer unit 11b of the agitator wheel 11 for each batch, and a mortar having a predetermined composition is obtained. The mixed mortar is transported to the construction site via the agitator wheel 11. Moreover, in the air mortar placing plant provided at the construction site, the air mixed with the mortar in the mixer unit 11b or the air mortar preparation by the gas flow meter 22 or the measuring unit of the bubble generating device 18 is used. The mixing amount of the bubble-containing liquid can be controlled to be a predetermined composition. Furthermore, in this embodiment, the agitator wheel 11 is provided with a kneading time timer and the like, and can control the kneading speed and kneading time. When the amount of air mortar to be placed is large, a kneading apparatus for mortar production is directly provided in the air mortar placement plant, and a predetermined amount of cement, sand, It is also possible to produce air mortar by adding water or the like for each batch to mix and form the mortar and mixing the foam-containing liquid for air mortar preparation of a predetermined blending with the formed mortar.

  In the present embodiment, the fluidity sensor unit 19 is integrally attached to the mortar hopper 14. As shown in FIGS. 2 and 3, the fluidity sensor unit 19 is disposed inside the stirring blade installation chamber 24 and the stirring blade installation chamber 24 partitioned from the main body portion of the mortar hopper 14 by the baffle plate 23. The motor sensor 26 is composed of a rotary stirring blade 13 and a drive motor unit 25 disposed outside the stirring blade installation chamber 24. The drive motor unit 25 of the motor sensor 26 is connected to a personal computer 27. Yes.

  Here, as the motor sensor 26 including the rotary stirring blade 13 and the drive motor unit 25, various known rotation sensors including a torque detection unit can be used. By using a rotation sensor having a torque detection unit as the motor sensor 26, the rotational resistance when the rotary stirring blade 13 is rotated in the air mortar 10 filled in the stirring blade installation chamber 24 is determined as the drive motor unit 25. Thus, the fluidity of the air mortar 10 can be accurately detected by the detected rotational torque.

  In the present embodiment, the drive motor unit 25 of the motor sensor 26 is connected to a personal computer 27, and the personal computer 27 has the air mortar 10 mixed in a predetermined composition set in advance. The correlation by the calibration of the rotational torque and specific gravity by the rotary stirring blade 13 of the same motor sensor 26 is taken in. Then, as will be described later, after being put into the mortar hopper 14 from the mixer section 11 b of the agitator wheel 11, the rotary stirring blade 13 of the air mortar 10 immediately before being pumped by the pumping pump 12 to the open channel 20 as a placement site. Is detected by the motor sensor 26, and the detection result is sent to the personal computer 26 as a current value signal, and is applied to the correlation between the predetermined rotational torque and the specific gravity, so that the air just before being pumped is sent. While measuring the specific gravity of the mortar 10, it is possible to check continuously and manage the rotational torque and specific gravity.

  Furthermore, in this embodiment, management values are set in advance as primary management values, secondary management values, and the like for the rotational torque and specific gravity managed by the personal computer 26. For example, the detected rotational torque and measured values are measured. When the specific gravity reaches the primary control value from the normal range, for example, a warning is issued via the warning light 28 so that measures can be taken early, and such a tendency can be taken in the next batch. This can be reflected in the kneading time of the air mortar 10. When the detected rotational torque and measured specific gravity reach the secondary control value, the pumping of the air mortar 10 by the pumping pump 12 is immediately stopped and the air mortar 10 of the batch is discarded. It can be done.

  Furthermore, in the present embodiment, the personal computer 26 is connected to the gas flow meter 22 and the bubble generating device 18 so as to be able to manage the supply amount of the air mixed in the mortar and the bubble-containing liquid for air mortar preparation. Alternatively, the mixing time timer of the agitator wheel 11 may be connected. As a result, the detection result of the rotational torque and specific gravity of the air mortar 10 detected by the mortar hopper 14 via the motor sensor 26 may be fed back, and the mixing speed and time of the mixing of the air mortar 10 by the mixer unit 11b. You may enable it to control these appropriately, reflecting a detection result.

  In the present embodiment, before the air mortar 10 is pumped by the pumping pump 12 toward the open channel 20 as a placement site, the mortar hopper 14 is charged from the mixer portion 11b of the agitator wheel 11 via the discharge chute 11a. The fluidity of the air mortar 10 after kneading is detected as rotational torque by rotating the rotary stirring blade 13 of the motor sensor 26.

  Here, in the present embodiment, the rotary stirring blade 13 is disposed in the stirring blade installation chamber 24 partitioned from the main body portion of the mortar hopper 14 by the current plate 23, and the air filled in the stirring blade installation chamber 24 is filled. The rotation resistance is detected by rotating inside the mortar 10. Since the rotary stirring blade 13 is configured to rotate inside the air mortar 10 filled in the stirring blade installation chamber 24, the air mortar 10 when being introduced into the mortar hopper 14 from the mixer portion 11b of the agitator wheel 11 is used. It is possible to accurately detect the rotational resistance without being affected by the flow of the current.

  Further, if the rotary stirring blade 13 is rotated only in one rotation direction, there is a possibility that a specific tendency may occur in the flow of the air mortar 10 in the stirring blade installation chamber 24. It is possible to evaluate the fluidity of the air mortar 10 with higher accuracy by detecting the rotational resistance by rotating it in the direction and calculating the average value with the rotational resistance when reversed.

  And according to the quality confirmation management method of the air mortar of this embodiment, the change of the fluidity | liquidity of the air mortar 10 accompanying the change of the length of kneading | mixing time is confirmed, and the quality of the air mortar 10 is managed more accurately. It becomes possible.

  That is, in the air mortar quality confirmation management method of this embodiment, the mortar hopper 14 having the rotary stirring blades 13 is interposed between the agitator wheel 11 and the pressure pump 12, and the air mortar retained in the mortar hopper 14 is used. The specific gravity of the air mortar 10 is measured by detecting the rotational resistance by rotating the rotary stirring blade 13 in the interior 10, and the air mortar 10 is pumped while confirming the quality of the air mortar 10 through the measured specific gravity. Therefore, in addition to managing the blending amount of cement, sand, foaming agent, water, etc. at a certain ratio, the change in the fluidity of the air mortar 10 with the change in the kneading time length This makes it possible to manage the quality of the air mortar 10 with higher accuracy.

  The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, the construction site of the air mortar to which the quality confirmation management method of the present invention is adopted is not limited to the construction site where new piping material is laid inside the existing open channel, It can be employed in various other air mortar construction sites where high accuracy is required for quality.

  Also, even if the air mortar kneading time is the same, the quality will change depending on the weather conditions such as temperature and humidity, the specifications of the kneader, etc. It is difficult to uniformly determine and manage the correlation between resistance and specific gravity. Therefore, for air mortars of various formulations, multiple correlations between rotational resistance and specific gravity when using different weather conditions and kneaders with different specifications are obtained in advance, and an appropriate correlation is determined from these multiple correlations. It is preferable to select the relationship as appropriate so that the quality of the air mortar in the predetermined composition, weather conditions, kneading apparatus, etc. can be accurately controlled.

10 Air mortar 11 Agitator car (kneading equipment)
11a Discharge chute 11b Mixer part 12 Pressure feed pump (pressure feed device)
13 Rotating stirring blade 14 Mortar hopper (mortar retention part)
DESCRIPTION OF SYMBOLS 15 Bubble agent tank 16 Dilution water tank 17 Compressor 18 Bubble generator 19 Fluidity sensor part 22 Gas flow meter 23 Rectifier plate 24 Stirring blade installation chamber 25 Drive motor part 26 Motor sensor 27 Personal computer 28 Warning light

Claims (3)

After being kneaded by a kneading device, it is a quality confirmation management method for air mortar that is pumped by a pumping device and placed at a placement site,
A mortar staying part is interposed between the kneading device and the pumping device, and a rotary stirring blade is provided in the mortar staying part, and the rotating stirring blade is placed inside the air mortar retained in the mortar staying part. By detecting the rotational resistance by rotating , the specific gravity of the air mortar immediately before being pumped to the placement site is measured by the pumping device, and the air mortar is pumped while checking the specific gravity immediately before the pumping is measured. And
The air mortar kneaded by the kneading device is mixed with a predetermined composition set in advance, and the specific gravity of the air mortar immediately before being pumped to the placement site is mixed with the predetermined composition set in advance. The rotational resistance detected by rotating the rotary stirring blade in the air mortar retained in the mortar staying portion in advance, with the correlation between the rotational resistance by the rotary stirring blade and the specific gravity determined in advance. Is applied to the correlation between the rotational resistance of the rotary stirring blade determined in advance and the specific gravity, and the quality confirmation management method for air mortar. The rotating stirring blade is disposed in a stirring blade installation chamber partitioned by a baffle plate from the main body portion of the mortar staying portion, and rotates inside the air mortar filled in the stirring blade installation chamber to detect rotational resistance. The quality confirmation management method of the air mortar of Claim 1 adapted to do . The rotary stirring blade is connected to a computer, and the detected rotational resistance and the measured specific gravity are managed by the computer, and the detected rotational resistance and the measured specific gravity are preset management values. When a warning is reached, a warning is issued so that measures can be taken as soon as possible, or it is reflected in the kneading time of the air mortar in the next batch, or the pumping of the air mortar by the pump is stopped, and The quality confirmation management method for air mortar according to claim 1 or 2, wherein the air mortar can be discarded .

Images