JPS6151255B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the invention of a method and apparatus for testing the injectability of mixed fluids, and the present invention relates to the invention of a method and apparatus for testing the injectability of mixed fluids, and the present invention relates to the invention of a method and apparatus for testing the injectability of mixed fluids, and the present invention relates to the invention of a method and apparatus for testing the injectability of mixed fluids. It is an object of the present invention to provide a method and apparatus that can appropriately clarify the injectability into the gap.

Conventionally, a resistor such as coarse aggregate is filled in the injection area such as in a formwork or in an excavated borehole, and mortar or paste is injected into the gaps between the resistor particles to form the mold. Some proposals have been made. However, when a mixed fluid is injected into the gaps between such resistor particles, if the mixed fluid exhibits the properties of a Newtonian fluid that flows in an orderly manner with a certain proportional relationship, the viscosity of the fluid It is already known that the injectability can be elucidated from the coefficients and resistance length of the resistor particles, such as the flow rate, density, etc., and the size, porosity, shape, arrangement state, etc. of the resistor particles. However, the behavior of fluids that do not exhibit Newtonian fluid properties, such as Bingham fluids and non-Bingham fluids, is complex, and there are many aspects that remain unclear. wide. That is, although cement-based mortar or paste containing cement particles or sand particles is widely used in construction and civil engineering today, the mixed fluid is generally treated as a Bingham fluid or a non-Bingham fluid. showing the nature,
Regarding the actual situation when this material is injected under conditions where it is pre-filled with coarse aggregate as described above, only its apparent viscosity has attracted attention, and sufficient elucidation has not been made. In particular, the injection area is filled with one or both of gravel, other coarse aggregate, fibrous materials, etc. (hereinafter simply referred to as coarse aggregate, etc.) in advance with such a mixed fluid according to the prepacked method or grouting method. When injected under certain conditions, it exhibits various changes, and the actual state of its injectability cannot be elucidated using simple viscosity or flow rate. In other words, these measurements are only for the injected fluid, and even if only the flow velocity is determined as in the P funnel, or the shear stress yield value as in the rotational viscometer, the shear stress yield value and viscosity are combined. In any case, it is not possible to elucidate the actual state of the injection operation as described above, since the measured values can only be obtained as measured values. Moreover, in the prepacked method and grouting method described above, accurate evaluation of the injectability of the mixed fluid is not only necessary to ensure smooth injection, but also to be a factor that has a decisive influence on the strength of the resulting product. It is clear that this is the most important measurement item when carrying out specific construction work. In view of the above-mentioned circumstances, the present invention has been devised based on repeated studies and conjectures, in accordance with specific injection conditions, and in a manner that allows for analytical examination. In other words, the present inventors have conducted numerous experiments and studies regarding concrete injection using various types of coarse aggregates in practice regarding the prepacked method as described above. As mentioned above, it has been confirmed that the injectability of plastic fluids that do not exhibit the properties of Newtonian fluids, such as mortar or paste, cannot be solved by simple viscosity. For example, mortar used for such pouring can be made by mixing sand in an amount of 0.8 to 2.0 times the amount of cement commonly used in the past, with a water-to-cement ratio of 40 to 60%. and about these mortar
The relationship between the flow value using a P funnel according to the JASS5T-701 pouring mortar test method for pre-packed concrete and the pouring pressure to achieve a preferable pouring in a certain pouring area within the formwork has been studied and summarized. It is not always possible to obtain an orderly relationship between It was almost the same thing. Therefore, as a result of considering and estimating the reasons why the injectability of mixed fluids that show the same flow value differs, the first thing that comes to mind is that the initial shear stress yield value due to the fact that the fluid in question is Bingham fluid. However, under the flow conditions during actual injection, the particles in the mixed fluid may get caught between particles of the resistor such as prepacked coarse aggregate, or settle and accumulate, thereby increasing the resistance. In fact, even with the same mixed fluid, the resistance in the injection zone slightly increases and fluctuates between the initial and final stages of injection, and therefore the same injection rate It was confirmed that in order to obtain this, it is necessary to increase the injection pressure to a certain degree over time.

That is, the basic invention of the present invention is to continuously and quantitatively feed a mixed fluid such as cement mortar, paste, etc. from one side of the cylinder into a cylinder filled and fixed with aggregate in a predetermined length range. The method is characterized in that the pressure increase state on the injection side after the completion of almost complete injection into the aggregate packed bed is measured to determine the sedimentation resistance, and the sedimentation and sedimentation resistance of the mixed fluid as described above is determined. This type of sedimentation resistance is a new proposal by the present inventors, and is indispensable on-site when injecting a mixed fluid using cement, etc. as described above. By doing so, the actual situation during actual injection can be appropriately elucidated.

In addition, a second aspect of the invention is to continuously and quantitatively feed a mixed fluid such as cement mortar, paste, etc. from one side of the cylinder into a cylinder filled and fixed with aggregate in a predetermined length range, and to absorb the mixed fluid into the bones. The viscosity or initial shear stress yield value of the mixed fluid is determined from the state of pressure increase on the injection side until the completion of almost complete injection into the aggregate packed bed. After the injection is completed, the pressure increase state on the injection side is continuously measured to determine the sedimentation resistance, and in addition to the sedimentation resistance as described above, the viscosity or initial shear stress yield value of the mixed fluid is also determined. It is something to seek;
By providing both such measured values together, a practical injection plan etc. can be appropriately obtained analytically.

Furthermore, the third invention is provided with a pressure feeding mechanism for continuously and quantitatively pumping the mixed fluid from one side of the cylindrical body filled and fixed with aggregate in a predetermined length range,
Moreover, it is characterized in that a pressure measuring device is provided between such a pressure feeding mechanism and the aggregate filling area, and it is a relatively compact mechanism for appropriately carrying out the basic invention as described above. This allows the method of the present invention to be carried out accurately.

To explain a specific embodiment of the present invention as shown in the attached drawings, the present inventors first used a device as shown in FIG. A cross-sectional form including other shapes, preferably a cylindrical shape, with one end of the cylinder 1 serving as an open outlet 2, and a support part 9 being disposed inside thereof, as well as a standard for ensuring a constant filling length. The rod 10 is set as necessary, such as at the center of the cylinder 1 (such a reference rod 10 is particularly suitable for a test device for injecting into reinforcement tissue), and the wire mesh materials 8, 8 are placed on both sides. An aggregate filling area 11 is formed and the aggregate filling area 11 is filled with an appropriate aggregate 12, and an inlet 13 is provided on the inlet side opposite the outlet 2 as described above. A cover plate 3 having a
3 is provided with a pressure measuring device 4 for measuring air pressure or earth pressure, and a pumping mechanism 5, preferably a screw pump, which pumps the mixed fluid steadily without pulsation through a connecting pipe 6. are connected. In addition, as mentioned above, the open outlet 2 has a receiver 7 equipped with a scale for measuring the discharge amount.
is configured to be set.

Although this illustration shows a type in which the cylindrical body 1 is set horizontally as described above, the device according to the present invention is not limited to the case where the cylindrical body 1 is horizontally set. As shown in the figure, the cylindrical body 1 is set vertically, and the cylinder body 1 is press-fitted from the lower part through the hemispherical lid body 3 having the inlet 13 in the same manner as described above, and branches into this inlet 13. At least a pressure measuring device 4 may be provided, and a spout 2' may be formed on one side of the outlet 2 at the top of the cylindrical body 1 to receive the outflow into a receiver 7. Also, contrary to the case shown in FIG. 2, as shown in FIG. 3, a hemispherical lid body 3 having an injection port 13 is provided on the upper part of the cylinder body 1, and a pressure feeding mechanism is attached to this lid body 3. The connecting pipe 6 from 5 is bent as shown in the figure to introduce the mixed fluid, and the cylinder body 1 is provided with another lid body 14 having a discharge port 2 formed on one side at the bottom thereof. , a receiver 7 may be used to receive the outflow from the discharge port 2.

Furthermore, as shown in FIG. 4, it is possible to use a device having the same configuration as that shown in FIG. 2 described above, but with the same configuration as that shown in FIG. Of course, in the inclined type shown in Fig. 4, a configuration similar to that shown in Fig. 3 is adopted, and instead of the bottom injection method shown in Fig. 4, a top injection method is used. can do.

In this way, the cylindrical body 1, which forms the main body of the device, may be of a horizontal type, a vertical type, or even an inclined type, and the relationship between the inlet and the discharge port may be of a bottom pouring type or a top pouring type. As to which method to follow, it is practically preferable to select one that matches the concrete injection area or injection state of the mixed fluid into the mold according to the mode of injection construction. That is, according to the results of measurement operations carried out by the present inventors using various measuring devices, it is possible to use cylindrical bodies 1 with the same inner diameter and aggregate filling regions 11 with the same length within the cylindrical bodies 1.
Even when the same mixed fluid such as mortar is injected into a cylindrical body formed with It has been confirmed that the specific measurement results obtained differ depending on whether the inlet or the outlet is located at the top when the configuration is set as above. This is based on the fact that the behavior of the particles contained in the mixed fluid when passing through the aggregate filling area inevitably changes to a certain extent in relation to the flow direction of the mixed fluid, and the above-mentioned first ~4 If the type shown in Figure 4 is used as an indicator, it is important to know whether the intended mold or injection area is vertical or horizontal. Depending on whether the injection method is a top pouring method or a bottom pouring method, it is preferable to adopt a type of measuring device that meets these conditions. However, without particularly using the measured value itself as an indicator,
When simply comparing and determining the injectability between multiple types of mixed fluids, or when making corrections for the type of injection region or injection method that is different from the type of the measuring device, for the measured value obtained with the measuring device itself. It is clear that a single type of device can be sufficiently adapted to any injection area and type of injection in cases where the values are determined in advance; There is no need to prepare equipment.

In any of the above devices, the pressure measuring device 4 can be set at any position between the aggregate filling area 11 and the pumping mechanism 5, but if the measured value itself is important, is selected as close to the aggregate filling area 11 as possible, and can therefore be set in the chamber 15 formed on the inlet side of the cylinder 1.

To carry out a specific measurement operation using the above-mentioned device, a mixed fluid such as mortar is fed into the cylinder 1 having the aggregate filling area 11 by the pressure feeding mechanism 5, and in this case, pressure measurement is performed. The measured pressure values obtained in the device 4 generally form a curve as shown in FIG. That is, part a is the pressure change until the mixed fluid reaches the aggregate filling area 11, and in this range, the pressure changes while the mixed fluid reaches the aggregate filling area 11 formed in the cylinder 1 through the injection port 13. As shown in the figure, the pressure increases in approximately direct proportion to the tube wall resistance. In this way, the mixed fluid enters the aggregate filling area 11.
After reaching , the pressure increases due to the resistance when the mixed fluid passes through the aggregate filling area 11, taking a sharp curve as shown in part b of FIG. 5.
If the pressure increases in this way and the mixed fluid completely passes through the aggregate filling area 11, the mixed fluid will be discharged from the discharge port 2 and received by the receiver 7. After the material filling region 11 is completely filled and the material is discharged, there are no factors that increase the resistance, at least as shown in the figure, and therefore, from this point on, the pressure measuring device 4 does not As a result, the measured values are completely flat, and if the pumping conditions by the pumping mechanism 5 are constant, no increase in pressure should be observed. In fact, even with this device of the present invention, in the case of a Newtonian fluid, a completely flat state is shown as indicated by the dotted line e in FIG. However, in the case of a non-Newtonian fluid, especially a mixed fluid such as mortar, which is a Bingham fluid as described above, even after the discharge is obtained from the discharge port 2 as described above, the pressure does not increase relatively slowly. As shown in part c in Figure 5, even with Bingham fluid, the pressure increase after discharge is generally proportional to time when the pumping amount is constant, and part c, which forms a straight line in the diagram, is obtained. . Furthermore, after the pressure of the mixed fluid, which is Bingham fluid, increases linearly, the pressure gradually increases again depending on the mixed fluid, but the timing differs depending on the mixed fluid, but the pressure increases again. Generally, the value fluctuates widely.

FIG. 6 also shows various changes in the various measurement results obtained through the measurement process shown in FIG. 5. That is, A, B,
Even though the measurement results obtained using a mixed fluid of three types of Bingham fluids exhibiting a curve like C are somewhat different in their specific behavior, the measurement results up to the point of passing through the aggregate filling area 11 in FIG. In the first stage, the appearance is almost the same, and in this first stage, the pressure increase occurs as the aggregate flows through the gaps between the aggregates, so this pressure increase has some relationships as will be explained later, but generally speaking. can be considered to be approximately equal to the distance resistance, and therefore, by dividing such pressure by the distance of the aggregate filling area 11, the resistance per unit length of the aggregate filling area 11 can be found. , this value varies depending on the properties of the filled aggregate 12, the viscosity of the mixed fluid, and the initial shear stress yield value. That is, according to the present invention, such a first
From the measured values at this stage, it is also possible to determine, for example, the approximate initial shear stress yield value for the filler aggregate.

The second stage in FIG. 6 is the basic measurement area in the present invention, and if the injected fluid is a Newtonian fluid, the respective measurement results will be A', B', and C in this second stage. As mentioned above with reference to Fig. 5, the pressure remains completely flat as shown in ', but in the case of a mixed fluid that is Bingham fluid, pressure increases are also observed in the second stage as shown in A, B, and C, respectively. , it will be different depending on the front of each mixed flow. In other words, in the case shown in Fig. 6, even though the mixed fluids A and B exhibit linear pressure increases, A enters this second stage at a relatively low pressure value, and moreover, the pressure rises more rapidly than B. In contrast, although B entered the second stage at a relatively high pressure value, the subsequent pressure increase was low. On the other hand, C shows a rapid pressure increase again with almost no direct proportional increase period in the second stage. In the case of C fluid with a lid, its injectability is unstable, and in fact, even if coarse aggregate is injected into the prepacked formwork using a mixed fluid that shows such measurement results, there will be some injectability. No matter how carefully the injection is carried out, it is impossible to perform an injection in which difficulty or occlusion occurs and a long injection distance is required. In the case of A and B as described above, even though B has lower fluidity in the aggregate and lower injection rate, it is significantly more stable in terms of injection properties, which are the basic measurement objectives of the present invention. In this way, even if a linear pressure increase is shown in direct proportion at the second stage, the one with a smaller degree of pressure increase will have more stable injection performance and will not inject properly even over a long distance. It's something you get.

To explain this in relation to a specific mixed fluid, for example, when cement paste is injected by filling the aggregate filling area 11 with glass marbles with a diameter of 17 mm, the apparent softness of the cement paste is similar to that of the P funnel described above. It is approximately proportional to the measured value by
However, this apparent softness (P funnel measurement value) appears as a pressure increase state in the first stage in FIG. 6, and the softer it is, the smaller the pressure increase state is. However, the pressure increase in the second stage varies in various ways depending on the conditions for adjusting the cement paste, and it is difficult to find a general relationship between the pressure increase and the behavior in the first stage. This is almost the same in the case of mortar, and it is assumed that the behavior in the second stage changes depending on the conditions of the paste as described above as well as the properties of the sand (fine aggregate) mixed in. . However, the three types such as A, B, and C shown in Fig. 6 summarize the modes of change exhibited by each mixed fluid. For example, in Figure 5, the b process has a steep rise, a gentle slope, and an intermediate one, and the c process in Figure 5 has a steep slope, a gentle slope, and an intermediate one. Various combinations are possible.

It should be noted that the sedimentation resistance itself does not suddenly appear at a specific point in time when the mixed fluid is injected into the aggregate layer, such as at part C in Figure 5 or at the second stage in Figure 6, but rather during the injection process. Although it is certain that it exists from the beginning of the injection head, this sedimentation resistance that exists from the beginning of the injection head is combined with other resistance factors in parts a and b in Figure 5 or in the first stage in Figure 6. shown, so these a, b
It is technically very difficult to measure this sedimentation resistance itself in the section or in the first stage. In contrast, in FIG. It is clear that only this sedimentation resistance appears in part c and the second stage in FIG. 6, and therefore it can be clearly understood and measured. In addition, if the sedimentation resistance can be clearly determined in this way, such as in the second stage of Figure 6, it can be estimated even if the sedimentation resistance in the first stage is particularly required. This will greatly contribute to the elucidation of the relationship between injection resistance in the first stage.

Furthermore, in the case of measurement using the measurement mechanism shown in Figs. 1 to 4 as described above, if the measured values obtained by the pressure measuring device 4 during periods a and b in Fig. 5 are used, it is actually possible to For a selected injection zone having a fairly long injection distance, it is possible to predict the injection conditions based on the injection pressure at the end of the injection zone in relation to the filling aggregate.
That is, FIG. 7 shows such a relationship, and in each process of a, b, and c obtained as shown in FIG. 5, at the inflection point between b and c on the vertical axis, The pressure value is P ₁ , and a line drawn parallel to the horizontal axis from the intersection point P' of the extension line that extends the slope of process c and the straight line drawn parallel to the vertical axis from the inflection point between a and b. Let P ₂ be _the pressure value found at the intersection with
The pressure value obtained using the same method as when calculating P ₃
Moreover, the time of the b process found by each perpendicular line drawn on the horizontal axis (time) from the inflection point between a and b and the inflection point between b and c, respectively, is set as t ₁ and is actually injected. If n is the value (an integer value) obtained by dividing the distance L of the injection zone by the distance L injected within this time _t1 , then the injection pressure at the end of the injection zone as described above is (Final pressure) P is determined by the following formula.

However, in the above equation, k is a pressure effect coefficient, which is 1 under normal pressure, and changes slightly depending on the pressure conditions when the pressure is reduced or increased. Further, i is an integer from 0 to n-1 in the series. Of course, it is obvious that the end of the injection region in terms of a bolt can also be found as a position in the middle of the injection region, which is the position before reaching the end, depending on the case. It is possible to elucidate the details of the injection conditions. It goes without saying that detailed elucidation of the injection conditions required in this manner will be an important factor in predicting and estimating the strength and other performance of the injection molded product obtained by such injection.

A specific measurement example of the above-mentioned product according to the present invention will be explained as follows.

Measurement example 1 Using a measuring device as shown in Fig. 1, that is, using a cylinder 1 of the measuring device with an inner diameter of 105 mm and a length of 500 mm, the length of the aggregate filling area is 450 mm, and the filling area is The crushed stone ranges from 20 to 25mm with a porosity of 46.5%
In addition, an air pressure measuring device is attached to the upper part of the inlet 13 as the pressure measuring device 4 to measure the pressure, and the air sealed in the lower part of the measuring device 4 is pumped by a snake pump. It now measures pressure.

Portland cement as mixed fluid 791Kg/
water to 826 kg/m ^{3 of} river sand with a coarse grain fraction (FM) of 1.71.
Mortar (water-cement ratio, ie, W/C: 54.4, cement-sand ratio, ie, C/S: approximately 1.0) was prepared with a blending ratio of 430 Kg/m ³ .

The flow value of this mortar through the above-mentioned P funnel is 16.4 seconds, and the result of measuring this with the above-mentioned device of the present invention shows that the injection speed from the pumping mechanism 5 is approximately 22.5 cm/min in the aggregate filling area 11. In the case where the pressure is approximately constant in minutes, the pressure enters the second stage as shown in Figure 6 at 0.117Kg/ ^cm2 , and then the injection continues for 15 minutes.The measurement results show that the pressure increases linearly until the injection time is 10 minutes. The pressure rose to 0.236Kg/cm ² , but after that the pressure rose sharply and reached 0.313Kg/cm 2 with an injection time of 13.5 minutes.
Kg/cm ² , and after that the measured value becomes sharp like a sawtooth.
It showed repeated pressure fluctuations within the range of 0.264-0.873 Kg/ ^cm2 .

According to the results of a pouring test using this mortar into a pre-packed formwork, there was a high possibility of occurrence of blockage, and smooth pouring could not be achieved.

Measurement Example 2 Using the same equipment as in Measurement Example 1, 791Kg/m ³ of Portland cement and 818Kg/m ³ of river sand with a coarse grain ratio of 1.66 were measured.
Mortar (W/C: 53.8, C/S: approximately 1.0) was prepared by mixing water at a ratio of 426 kg/m ³ .

The flow value of this mortar was measured and was 15.8.
The injection rate was approximately the same as in Measurement Example 1, and the difference was almost within the measurement error range. However, when this mortar was measured with the device of the present invention, the injection speed was the same as in Measurement Example 1. When the display is approximately constant at 24.8 cm/min, the second stage in Figure 6 is entered at 0.104 Kg/cm ² , and the measurement results over the subsequent 15 minute injection time show a completely proportional pressure increase of 0.147 Kg/
^cm2 , confirming that the mortar has low pressure rise and good pourability.

Of course, the concrete injection results using this mortar were extremely stable, and the injection over long distances could be carried out smoothly.

Measurement example 3 To be measured using the same equipment as measurement example 1, Portland cement 794Kg/m ³ and river sand 842Kg/m ³ (coarse particle ratio 1.75)
The flow value was 21.1 seconds when water was mixed at a ratio of 432 kg/m ³ with a W/C of 54.4% and a C/S of 1.0. The measurement results are as shown in measurement example 1, and when the injection rate is approximately constant at 25.5 cm/min, it enters the second stage in Figure 6 at 0.157 Kg/ ^cm2 ,
The measurement results for 15 minutes from the second stage showed a pressure increase in approximately direct proportion as in Measurement Example 2, and the measurement results for 20 minutes also showed 0.229 Kg/cm ² . That is, it was confirmed that this mortar exhibited stable pourability as in Measurement Example 2, and had good pourability.

However, using this mortar, concrete measurement example 2
As a result of the injection test under the same conditions as the above, the flow value exceeded 20 seconds, and the injection performance was not necessarily favorable for this flow value. However, it was confirmed that it had stable and favorable injection properties similar to those of Measurement Example 2.

Measurement example 4 Portland cement 1495.2Kg/m ³ , water 516.1
W/C mixed at a ratio of Kg/m ³ and dispersant 7.47Kg/m ³
The paste containing 35% was kneaded for about 3 minutes using a mortar mixer with a rotation speed of 300 rpm. The flow value was 54.8 seconds, and this was measured using the device of measurement example 1.
The measurement results were obtained by forming an aggregate-filled area with glass marbles with a diameter of 17 mm inside the interior.The injection rate was 0.209 Kg/min when the injection rate was approximately constant at 25.7 cm/min, which is the same indication as in measurement example 1.
cm ² and enters the second stage in Figure 6, and then the injection time for 7 minutes showed a proportional linear increase, but after this injection time of 8 minutes showed 0.294Kg/cm ² , the pressure increased. was disturbed, and the injection time became 0.716 Kg/cm ² or more at 12.5 minutes, making injection difficult.

In contrast, Portland cement 1493.8Kg/
Cement paste was mixed with a mortar mixer with a rotation speed of 600 rpm for about 3 minutes after mixing in the ratio of 515.6 Kg/m ³ of water, 7.46 Kg/m ³ of water, and 7.46 ^Kg /m 3 of dispersant.
Even though it is 35% and has the same composition as above, the flow value is 43.9 seconds, and the result of testing with the same device is that the injection speed is 25.7 cm/min, which is the same indication as measurement example 1, and is approximately constant. Entering the second stage in Figure 6 at 0.179Kg/cm ² , the injection test results for 15 minutes showed a completely linear pressure increase gradient of 0.224Kg/cm 2 .
^cm2 , and the same trend was observed thereafter.

The present invention as described above is applicable not only to mortar and paste, but also to sludge, sludge, bentonite, coal dust-containing fluids, and other particles that are generally solid or semi-solid relative to water or other liquids.
It can be applied to any case where the injectability of a fluid containing a species or a mixed fluid containing two or more species is to be determined, and therefore it cannot necessarily be determined by a conventional P funnel or rotational viscometer or any other measuring means. It has been confirmed through many practical studies that the injectability of this type of mixed fluid, especially into coarse aggregate or fine aggregate structure, can be clearly determined.

According to the basic invention of the present invention as explained above, cement mortar, paste, or other mixed fluid is continuously applied from one side of the cylinder to a cylinder filled and fixed with aggregate within a predetermined length range. By quantitatively feeding the mixed fluid and measuring the pressure rise state on the injection side after the completion of almost complete injection of the mixed fluid into the aggregate filling area, it is possible to calculate the settling resistance in accordance with the actual injection conditions of the mixed fluid. In other words, it provides accurate injection characteristic factors that could not be properly elucidated using conventional methods, and enables desirable control or planning for this type of injection operation, which is an invention with great industrial effects. .

According to the second invention, the viscosity or initial shear stress yield value of both the mixed bodies can be determined from the actual value by the pressure increase relationship on the injection side during the measurement of the above-mentioned basic invention and until almost complete pouring is completed. These are determined together in accordance with the injection conditions, and the sedimentation resistance and viscosity or initial shear stress yield value are actually inseparable injection characteristic factors, and by elucidating them together, the injection It is highly effective industrially because it allows for stable control and planning at certain times.

Furthermore, in the third invention, a pressure feeding mechanism for continuously and quantitatively pumping the mixed fluid from one side of the cylinder is provided in front of the cylinder filled and fixed with aggregate in a predetermined length range, Moreover, since a pressure measuring device is provided between such a pressure feeding mechanism and the aggregate filling area, the measurement operations of the basic invention to the second invention as described above can be performed relatively simply and easily. Measurement operations can be carried out at any time, such as when adjusting plastic fluids or at construction sites, and this invention is also highly effective industrially.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention, and FIG. 1 is a cross-sectional view showing one basic example of the device according to the invention, and FIGS. 2, 3, and 4 show modified examples thereof. 5 is a chart showing standard examples of measurement results according to the present invention, FIG. 6 is a chart showing typical measurement results according to the present invention, and FIG.
The figure is an explanatory diagram of a method of determining the final injection pressure from the measurement results obtained according to the present invention. In these drawings, 1 is a cylinder, 2 is a discharge port, 3 is a lid, 4 is a pressure measuring device, 5 is a pumping mechanism, 6 is a connecting pipe, 7 is a receiver, 8 is a wire mesh, and 9 is a wire mesh. Support part, 10 is a reference rod, 11 is an aggregate filling area, 1
2 is the aggregate, 13 is the injection port, 14 is the lid body for discharging from below, 15 is the chamber formed on the inlet side, and a is the space in which the mixed fluid reaches the aggregate filling area. The pressure change state, b is the pressure change state during the injection of the aggregate filling area, c and d are the pressure change state after the aggregate filling area injection is completed, and e is the pressure change state after the aggregate filling area injection is completed in Newtonian fluid. This shows that.

Claims (1)

[Claims] 1. A mixed fluid such as cement mortar, paste, etc. is continuously and quantitatively fed into a cylindrical body filled and fixed with aggregate in a predetermined length range from one side of the cylindrical body, and the mixed fluid is A method for testing the injectability of a mixed fluid, characterized in that the pressure rise state on the injection side is measured after substantially complete injection into the aggregate packed bed is completed, and settling resistance is determined. 2. A mixed fluid such as cement mortar, paste, etc. is continuously and quantitatively fed into a cylindrical body filled and fixed with aggregate in a predetermined length range from one side of the cylindrical body, and the mixed fluid is applied to the aggregate filled layer. The viscosity or initial shear stress yield value of the mixed fluid is determined from the state of pressure increase on the injection side until the completion of almost complete injection, and after the completion of almost complete injection of the aggregate filling layer. A method for testing the injectability of a mixed fluid, which is characterized by successively measuring the pressure increase state on the injection side and determining the sedimentation resistance. 3 A pressure-feeding mechanism for continuously and quantitatively pumping a mixed fluid from one side of the cylindrical body to a cylindrical body filled and fixed with aggregate in a predetermined length range, and such a pressure-feeding mechanism and the above-mentioned 1. A mixed fluid injection test device, characterized in that a pressure measuring device is provided between the aggregate filling area and the aggregate filling area.