JP2020051086A - Method and device for producing fluidized soil - Google Patents

Abstract

To provide a method and a device for producing a fluidized soil to solve a new problem in which: simplification of a conventionally required production facility is aimed in order to enable the use of a fluidized soil even in a small amount and to produce a fluidized soil efficiently at low cost.SOLUTION: In a method for producing a fluidized soil in which a raw material soil 10 in a wet state and cement milk are mixed and agitated at a predetermined ratio, the ratio between the raw material soil 10 in the wet state and the cement milk is determined by a volume ratio of the fluidized soil to be produced to a production volume.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a method and an apparatus for producing fluidized soil, particularly a fluidized soil produced by mixing and stirring wet raw material soil and cement milk.

  Fluidized soil is highly evaluated for its usefulness as a resource-recycling type backfill material with high fluidity and self-hardening. As shown in FIG. 5, the composition of the fluidized soil 1 is dry soil 15, water 30 and cement 20, and the dry soil 15 is supplied from the raw soil 10 composed of construction-generated soil such as excavated soil, Numeral 30 is supplied from two systems: water 33 contained in the wet raw material soil 10, and additional water 35 newly added according to the composition of the fluidized soil 1. Therefore, the composition of the fluidized soil 1 is supplied as a raw material in a state of being combined with another composition such as the dry soil 15 and the contained water 33, or separated from the other composition such as the cement 20 and the additional water 35. Supplied as raw material.

When determining the blending of the fluidized soil 1, the moisture content of the raw soil 10 was measured, a blending test was performed, a slump flow test and a breathing rate test were performed on the test-kneaded sample, and a uniaxial compressive strength test was performed. The combination of the dry soil 15, water 30, and cement 20 that satisfies the required quality is determined. Since the composition of the fluidized soil 1 is controlled by the ratio of the solid components (dry soil 15 and cement 20) to water 30 as shown in the following equation, the wet raw soil 10, the additional water 35, It is necessary to measure the cement 20 according to the respective formulations.
Formulation of fluidized soil (% by weight) = weight of water / (weight of dry soil + weight of cement) × 100

  Conventionally, the fluidized soil 1 is blended by weighing the raw soil 10, the additional water 35, and the cement 20. As shown in FIG. 6, the required weight of the cement 20 stored in the cement silo 22 is measured by a silo measuring bottle 25 (load cell) and supplied to the cement milk solution tank 45, and the water is stored in the fresh water tank 37 by the flow meter 38. The required additional water 35 is weighed by a required amount and supplied to the cement milk solution tank 45 by the submersible pump 39, and the two are mixed and stirred, whereby the weight of the cement milk 40 based on the composition of the fluidized soil 1 is increased. Make a liquid. After that, the liquid cement milk 40 is supplied to the biaxial mixer 9 by the cement milk pump 48.

  On the other hand, the raw soil 10 is supplied to the measuring tank 5 by the belt conveyor 3 from the raw soil storage place in a wet state, and the weight of the raw soil 10 in the measuring tank 5 is measured by the load cell 7 to mix the fluidized soil 1. When the base weight is reached, the bottom of the measuring tank 5 is opened and supplied to the twin-screw mixer 9 and kneaded together with the cement milk 40 to produce the fluidized soil 1.

  Therefore, the cement 20 is weighed by the silo measuring bottle 25 (load cell) attached to the cement silo 22 and the raw soil 10 is weighed by the load cell 7 provided in the measuring tank 5 based on the composition of the fluidized soil 1. doing. In addition, since the specific gravity of the additional water 35 is 1, the weight is measured by measuring the flow rate with the flow meter 38 in the illustrated example. It is also possible to use a weight measuring device such as a load cell instead of the flow meter 38.

  As described above, in the production of the conventional fluidized soil 1, the mixing of the raw soil 10, the additional water 35, and the cement 20 as the raw materials is performed by weight measurement using the load cell 7, the flow meter 38, and the silo measuring bottle 25, respectively. . For example, Patent Literature 1 describes that the amount of water injected as a raw material, the weight of earth and sand, and the weight of a solidified material are measured by a load cell.

JP 2000-257109 A

Fluidized soil is gaining attention as a resource-recycling backfill material, and demand is high in urban areas, and shipments commensurate with its capacity can be expected. Even if it prepares, the cost has little influence on the production cost of the fluidized treated soil. However, in regions where demand for fluidized soil is to be stimulated, the amount of shipment is still unpredictable and the quantity is not stable. The availability is unclear. The production of fluidized soil requires special machinery and equipment, and the investment costs, transportation, assembly, and demolition costs to the construction site are directly reflected in the price of fluidized soil. Therefore, if the production amount of the fluidized treated soil is below a certain amount, for example, less than about 2000 m ³ , the production unit price will increase, losing competitiveness with other backfill materials such as poorly mixed ready-mixed concrete, and construction It is difficult to reuse the generated soil.

  The loss of competitiveness of the fluidized soil with respect to other backfill materials has made it difficult to invest in equipment costs required for the production of the fluidized soil, and as a result, the supply of the fluidized soil itself Will become unstable and fall into a negative spiral, which will negatively affect its spread. The rise in the production price of the fluidized soil 1 is mainly caused by the cost of the production equipment and the transportation, assembly and disassembly costs.

  Further, in the conventional manufacturing apparatus shown in FIG. 6, since the raw soil 10 is supplied by the belt conveyor 3, the control is also required, and the measuring tank 5 is filled with the raw soil 10 of about 80% of a predetermined weight. When the load cell 7 detects that, the speed of the belt conveyor 3 is reduced, and when the load cell 7 measures a predetermined weight, control to stop the belt conveyor 3 is required.

  Therefore, the present invention has been conventionally required for the widespread use of fluidized soil, especially for the use of fluidized soil even in a small amount, in order to efficiently manufacture fluidized soil at low cost. It is an object of the present invention to set a simplified manufacturing facility as a new problem and to provide a method and an apparatus for manufacturing fluidized soil to solve the new problem.

  In order to solve the above-mentioned new problem, the present inventor reviewed the conventional method and apparatus for manufacturing fluidized soil at each stage of the manufacturing process. As a result, the composition of the raw soil 10 as the raw material, the additional water 35, and the cement 20 is measured by weight measurement, and in particular, the weight of the raw soil 10 is measured by a combination of the belt conveyor 3, the measuring tank 5, and the load cell 7. I noticed that. These machinery and equipment require not only a considerable capital investment but also a considerable expense for transportation, assembly and disassembly for each site, and the production cost of the fluidized soil 1, especially when the production volume is small. This is because the ratio to the manufacturing cost is large. In addition, as for the cement 20, a silo measuring bottle (load cell) is often attached to the cement silo 22, and the weight (flow rate) of the additional water 35 is measured by the flow meter 38. Excluded from.

  Therefore, the present invention provides a measuring tank 5 and a load cell 7 for measuring the weight of the raw soil 10 which is indispensable for the production of the fluidized soil, and further a feed tank 10 for supplying the raw soil 10 to the measuring tank 5. If the belt conveyor 3 becomes unnecessary and these manufacturing facilities can be replaced with other simple facilities, the necessary manufacturing facilities can be simplified and the fluidized soil cannot be manufactured at low cost. As a result of diligent research based on the idea of heels, the present inventors have arrived at the present invention.

  In order to solve the problems of the present invention, according to claim 1, in a method for producing a fluidized treated soil in which a wet raw material soil and a cement milk are mixed and stirred at a predetermined ratio, the ratio of the wet raw material soil and the cement milk is determined. Is provided on the basis of a method for producing a fluidized soil determined by a volume ratio of the fluidized soil to the production capacity. According to claim 2, cement milk having a capacity corresponding to the production capacity of the fluidized soil is stored in the deflocculation tank, and thereafter, the raw material soil in a wet state is stored in the deflocculation tank. And a method of mixing and stirring the cement milk and the raw material soil in a wet state in a deflocculation tank.

  According to claim 3, the weight and the amount of cement contained in the fluidized soil are determined based on the composition and the production capacity of the fluidized soil, and the amount of water contained in the raw material soil is excluded from the determined water amount. Water as the additional water, a cement milk is prepared with the cement of the determined weight as the additional water and stored in the deflocculation tank, and the raw material soil wet in the cement milk in the clarifier is disintegrated. And a method of mixing and stirring cement milk and wet raw material soil in a deflocculation tank.

  Further, according to the fourth aspect, there is provided a method of supplying the raw material soil in a wet state to the level of the liquid level of the sludge tank corresponding to the production capacity of the fluidized treated soil. The method of detecting the liquid level position of the raw material soil in the wet state by a liquid level control meter installed in a deflocculation tank according to claim 6, wherein the production capacity of the fluidized soil, the blending of the fluidized soil, and the addition of cement. A method for determining the weight of cement and the amount of additional water for producing cement milk based on the amount, the moisture content of the raw soil in the wet state, the true specific gravity of the raw soil, and the true specific gravity of the cement.

  According to a seventh aspect of the present invention, there is provided a fluidized soil production apparatus for mixing and stirring a wet raw material soil and a cement milk at a predetermined ratio, wherein a cement milk having a capacity corresponding to a production capacity of the fluidized treated soil is stored. A liquid level control meter that manages the liquid level in the dewatering tank for the wet raw material soil supplied to the dewatering tank storing cement milk by the production capacity of the fluidized treated soil, Provided is an apparatus for producing fluidized treated soil, comprising mixing and stirring means for mixing and stirring cement milk and wet raw material soil in a mud tank.

  Claim 8 is an apparatus for producing a fluidized treated soil for mixing and stirring a wet raw material soil and cement milk at a predetermined ratio, wherein the cement silo stores cement and the silo weighs the weight of cement. A bottle, a fresh water tank for storing additional water, a flow meter for measuring the flow rate of the additional water, a cement milk liquid tank for producing cement milk, and a demug tank for producing fluidized soil. And a liquid level control meter for detecting the liquid level in the deflocculation tank, and means for mixing and stirring the inside of the deflocculation tank, corresponding to the production capacity of the fluidized treated soil produced in the cement milk producing tank. A volume of cement milk is stored in the deflocculation tank, and the wet raw material soil having a capacity corresponding to the production capacity of the fluidized soil is converted to a capacity corresponding to the production capacity of the fluidized soil. Until it is detected by the liquid level controller, Cement milk and raw soil material in a wet state in the solutions mud tank are stirred together in a total stirring means to provide a manufacturing apparatus for fluidizing treated soil to produce a fluidizing treated soil.

  According to the present invention having the above-described configuration, since the measurement of the raw soil performed by the combination of the belt conveyor, the measuring tank, and the load cell is performed by the capacity of the raw soil, the mechanical device for measuring the raw soil (the belt conveyor and the measuring tank). And load cells), so that these investment costs, transportation, assembly, and disassembly costs to the construction site are not required, and the cost of the fluidized soil can be reduced accordingly. In addition, instead of the measuring tank and the load cell, to detect the volume of the raw soil by detecting the position of the liquid level of the raw soil supplied into the mud tub by the liquid level control meter installed in the mud tub. In addition, the manufacturing process of the fluidized soil can be significantly simplified. Furthermore, it is not necessary to use a belt conveyor, which required drive control in accordance with the weight measurement of the raw soil, and the raw soil can be supplied to the deflocculation tank without the need for weighing and control with a backhoe or the like. .

  Therefore, according to the method and the apparatus for producing fluidized soil according to the present invention, it is possible to efficiently produce fluidized soil at low cost even in a small amount.

Explanatory drawing which shows the composition of a fluidization treatment soil, and a manufacturing method. Process explanatory drawing which shows the manufacturing process of fluidization treatment soil. The whole block diagram of the manufacturing apparatus of fluidization processing soil. The basic block diagram of the manufacturing apparatus of fluidization processing soil. Explanatory drawing which shows the composition of the conventional fluidization treatment soil, and the manufacturing method. The basic block diagram of the manufacturing apparatus of the conventional fluidization processing soil.

  The fluidized treated soil produced in the present invention is a fluid produced by mixing and stirring a raw material soil composed of construction excavated soil such as excavated soil and cement milk, and is mainly used as a backfill material. The fluidized soil has fluidity that can be pumped and poured, and hardens over time to wrap up the underground structure and have a water stopping effect. In addition, it has an excellent advantage as a backfill material in which uneven settlement can be prevented and re-excavation is also possible. In addition, it is possible to promote the reuse of construction soil and to reduce the volume.

The quality standard of fluidized soil varies depending on its use, and is determined by uniaxial compressive strength, slump flow, breathing rate, and specific gravity. Therefore, the method for producing fluidized soil needs to satisfy required quality standards using raw soil actually used as a raw material. For example, the quality standard of fluidized soil that can be used as a backfill material in Tokyo is as follows, and the present invention adopts this standard as the quality standard of fluidized soil to be manufactured.
Uniaxial compressive strength: 1.3 to 5.6 kgf / cm ² (after 28 days)
Slump flow: 180-300mm (cylinder method)
Breathing rate: less than 1% Specific gravity: 1.5 or more

  Hereinafter, an embodiment of a method and an apparatus for manufacturing a fluidized soil that satisfies the above-described quality standard will be described with reference to the drawings. The same components as those of the conventional example shown in FIGS. 5 and 6 are denoted by the same reference numerals and described. FIG. 1 is an explanatory view showing the composition and manufacturing method of the fluidized soil 1, FIG. 2 is a process explanatory view showing the manufacturing process, FIG. 3 is an overall configuration diagram of an apparatus for manufacturing the fluidized soil, and FIG. It is a block diagram. As shown in FIG. 1, the composition of the fluidized soil 1 is a dry soil 15, water 30 and cement 20. The dry soil 15 is supplied from a raw soil 10 made of construction-generated soil such as excavated soil, Numeral 30 is supplied from two systems: water 33 contained in the raw material soil 10 in a wet state, and additional water 35 newly added in accordance with the composition 52 of the fluidized soil. Therefore, the composition of the fluidized soil 1 is supplied as a raw material in a state of being combined with another composition such as the dry soil 15 and the contained water 33, or separated from the other composition such as the cement 20 and the additional water 35. Supplied as raw material.

  The raw material soil 10 is intended for all types of soil such as gravel soil, sandy soil, and cohesive soil, and there is no limitation on the type and generation cause. In particular, it mainly targets wet construction soil and construction sludge generated in large quantities in various construction works and civil engineering works, for example, excavation work of cast-in-place piles and underground continuous walls. As shown in FIG. 3, the raw material soil 10 is stored in a predetermined facility such as a raw material storage place 60 or a raw material storage tank (not shown).

  In order to reuse the raw soil 10 made of construction soil or construction sludge as a raw material of the fluidized soil 1, it is necessary to remove rubble of a certain size or more from the raw soil 10 in advance. The quality standard of the fluidized soil 1 specifies that the general backfill material is 40 mm or less gravel, and the backfill material around the buried pipe is 13 mm or less gravel. Therefore, the raw soil 10 stored in the raw soil storage 60 is supplied to a known classification device 62 by a backhoe 61 or the like, and the classified raw soil storage 63 or raw material tank ( (Not shown) or the like. 3 and 4, reference numeral 22 denotes a cement silo, which stores a cement 20 and has a silo measuring bottle 25 (load cell) for measuring the weight of the cement 20 attached thereto. Reference numeral 37 denotes a fresh water tank, which stores additional water 35 for producing a cement milk 40. Reference numeral 45 denotes a cement milk preparation tank for preparing a cement milk 40 from the cement 20 and the additional water 35.

In the fluidized soil 1 according to the present invention, the mixing ratio of the raw material soil 10 in the wet state and the cement milk 40 (a liquid produced from the cement 20 and the additional water 35) is adjusted with respect to the production volume 50 of the fluidized soil (see FIG. 2). It is characterized by being determined by the capacity ratio. As shown in FIG. 2, the production capacity 50 (for example, 5 m ³ or the like) of the fluidized soil and the composition 52 (for example, 40% by weight) of the fluidized soil are determined. When determining the blending 52 of the fluidized treated soil, the moisture content 12 of the raw material soil was measured and a blending test was performed, and a slump flow test and a breathing rate test of the trial kneaded sample were performed in the same manner as before. After the uniaxial compressive strength test, the composition 52 of the fluidized treated soil consisting of the weight ratio of the dry soil 15, the water 30, and the cement 20 that satisfies the required quality is determined. The composition 52 of the fluidized soil is controlled by the weight ratio of the solid components (the dry soil 15 and the cement 20) to the water 30 as shown in the following formula. , Cement 20 must be weighed in accordance with the respective formulations.
Mixing of fluidized soil (% by weight)
= Amount of water 30a / (weight of dry soil 15a + weight of cement 20a) × 100

Based on the formulation 52 of the fluidization process soil described above, to determine the cement addition amount 47 (for example 1 m ³ per 100 Kg). The cement addition amount 47 can be determined by determining the blending 52 of the fluidized soil and setting the weight of the dry soil 15 based on the water content 12 of the raw soil 10.

Next, the weight 20a of the cement corresponding to the production volume 50 of the fluidized soil is weighed by a silo measuring bottle (load cell) 25 (see FIG. 4) attached to the cement silo 22, and the weighed amount is stored in the cement milk solution tank 45. Supply. For example, if the cement addition amount 47 to 1 m ³ per 100Kg, when the fluidizing treated soil 1 5 m ³ production, amount 47 of the cement becomes 500 Kg.

  At the same time, water having a flow rate corresponding to the amount of water 30a contained in the fluidized soil 1 excluding the amount 33a of contained water contained in the raw material soil 10 is defined as the amount of additional water 35a. The liquid is supplied to the cement milk liquid preparation tank 45 by the pump 39 and kneaded with the cement 20 to form the cement milk 40. Since the specific gravity of water is 1, the flow rate of the additional water 35 is measured by the flow meter 38.

  Although the amount of the cement 20 and the additional water 35a as the raw materials of the cement milk 40 are measured by weight, the capacity 40a of the cement milk produced in the cement milk production tank 45 using these raw materials is a fluidization treatment. It is nothing but the capacity of the cement milk 40 contained in the soil 1. Therefore, the capacity obtained by subtracting the capacity 40a of the liquid cement fluid from the production capacity 50 of the fluidized treated soil to be produced is the capacity of the wet raw material soil 10 in the production capacity 50 of the fluidized treated soil. Focusing on this point, in the present invention, the raw soil 10 is cemented without measuring the weight of the raw soil 10, that is, without using the measuring tank 5 or the load cell 7 conventionally required for measuring the weight. It is characterized in that it is supplied by the volume ratio to the milk 40.

  In the present invention, a cement milk volume 40a corresponding to the production volume 50 of the fluidized soil to be produced is produced in the cement milk production tank 45, and supplied to the predetermined volume of the mud thawing tank 55 by the cement milk pump 48. A liquid level control meter 57 is installed in the deflocculation tank 55, and detects the position of the liquid level in the deflocculation tank 55, which becomes the production capacity 50 of the fluidized soil to be produced. For this reason, the position of the liquid level of the mud tank 55 detected by the liquid level controller 57 is determined according to the production volume 50 of the fluidized soil to be produced.

  Next, the wet soil 10 stored in a predetermined facility such as a raw soil storage yard 63 or a raw soil tank (not shown) by removing the gravels of a predetermined size is previously mixed with the cement milk 40 by a backhoe 65 or the like. It is sequentially charged into the supplied mud tank 55. At this time, it is not necessary to measure the weight or volume of the raw soil 10, and it is determined that the charging of the raw soil 10 causes the liquid level in the mud-removing tank 55 to become the liquid level of the production capacity 50 of the fluidized treated soil. It is only necessary to put the raw material soil 10 into the mud-removing tank 55 until the surface management meter 57 detects it. When the liquid level management meter 57 detects that the liquid level in the deflocculating tank 55 has reached the liquid level of the production capacity 50 of the fluidized soil, the charging of the raw material soil 10 is stopped. The raw material soil 10 having a capacity corresponding to the production capacity 50 of the fluidized soil is supplied to 55.

  Therefore, the cement milk 40 and the raw soil 10 in the demulsification tank 55 are demulsified by using a bucket or the like of a backhoe 65 used for charging the raw soil 10 and mixed and stirred 56 to obtain fluidized soil 1. Can be manufactured. Alternatively, the mixture may be further supplied from the sludge tank 55 to the agitator 67 and mixed and stirred. The manufactured fluidized soil 1 is supplied from the agitator 67 via the loading pump 58 to the mixer 70 from the loading device 59 and transported to the casting site. In addition, you may make it supply from the loading device 59 to the mixer truck 70 etc. from the sludge tank 55 via the loading pump 58 without using the agitator 67.

After measuring the water content 12 of the raw material soil 10 to be used, performing a blending test, performing a slump flow test or a breathing rate test on a sample that has been trial-kneaded, and performing a uniaxial compressive strength test to obtain a weight satisfying required quality. Based on the ratio, the composition 52 of the fluidized soil composed of the dry soil 15, the water 30, and the cement 20 and the production capacity 50 of the fluidized soil were determined as follows.
Production capacity of fluidized soil 50: 5 m ³ (5000 liters) ... Condition 1
Water content of raw soil 12: 20% by weight… Condition 2
Water content of raw soil 10 / weight of raw soil 10 × 100
True specific gravity of soil: 2.65
Cement addition amount: 100 kg / 1 m ³
Cement weight: 100 kg x 5 = 500 kg
True specific gravity of cement: 3.04
Composition of fluidized soil 52: 40% by weight
Amount of water 30a ÷ (weight of cement 20a + weight of dry soil 15 15a) × 100
Amount of water 30a in fluidized soil: amount of contained water 33a + amount of additional water 35a

The contents of the symbols used in the present embodiment are as follows.
Amount of contained water 33a: W ₀ (Kg, liter)
Amount of additional water 35a: W ₁ (Kg, liter)
Amount of water in fluidized soil 30a: W (Kg, liter) (= W ₀ + W ₁ )
Weight of dry soil contained in raw soil 15a: N (Kg)
True specific gravity of soil: γ (= 2.65)
Weight of cement: C (= 500 kg)
True specific gravity of cement: γ _C (= 3.04)
Cement capacity: C ÷ γ _C (liter)
Volume of dry soil contained in raw soil: N ÷ γ (liter)
Formulation 52 of fluidized soil: W ÷ (C + N) (= 0.4) (1)

5000 liters, which is the production capacity 50 of the fluidized soil shown in the condition 1, is obtained by the following equation.
N ÷ γ + W ₀ + W ₁ + C / γ _C = 5000 Equation (2) → (weight 15a of dry soil contained in raw material soil ÷ true specific gravity of soil + amount of water of fluidized soil 30a + weight of cement 20a ÷ cement True specific gravity)

As shown in Condition 2, since the water content 12 of the raw material soil is 20% by weight, W ₀ (the content of water 33a) can be converted into N (the weight 15a of the dry soil contained in the raw material soil) by the following calculation. .
W ₀ ÷ (N + W ₀ ) = 0.2
→ W ₀ = 0.2 × (N + W ₀ )
→ W ₀ = 0.25N (3)

From equation (1), W ₁ (the amount of additional water 35a) can be converted to the sum of N (weight 15a of dry soil contained in the raw material soil) and C (weight 20a of cement).
W ÷ (C + N) = 0.4
→ W = W ₀ + W ₁ = 0.4 × (C + N)
→ W ₁ = 0.4 × (C + N) −W ₀
(3) substituting _W 0 = 0.25 N shown in Formula _{→ W 1 = 0.4 × (C} + N) -0.25N = 0.15N + 0.4C ... (4) equation

When equations (3), (4) and actual data are input to equation (2),
N / γ + W ₀ + W ₁ + C / γ _C = 5000 Equation (2) N ÷ 2.65 + 0.25N + 0.15N + 0.4 × 500 + 500 ÷ 3.04 = 5000
→ 0.7774N = 4635.5
→ N = 5963Kg

From the above calculation, the amount 35a of the additional _water, because the W 1 = 0.15N + 0.4C, and numerical 5963Kg weight 15a of the dry soil contained in the raw soil material (N), numerical values of the cement weight 20a (C) By substituting 500 kg, the numerical value of the amount of additional water 35a (W ₁ ) is
W becomes _{1 = 0.15 × 5963 + 0.4 ×} 500 = 1094Kg. Therefore, 1094 Kg of additional water 35 as the amount of additional water 35 a is measured by the flow meter 38 and supplied from the fresh water tank 37 to the cement milk preparation tank 45, and 500 Kg of the cement 20 is measured by the silo measuring bottle 25. The cement milk 40 is supplied from the cement silo 22 to the cement milk preparation tank 45 and kneaded to form the cement milk 40, thereby reducing the capacity 40a of the cement milk in the production volume 50 (5000 liters) of the fluidized soil. Obtainable.

  The obtained volume 40a of the cement milk is supplied to the mud tank 55, and then the raw soil 10 is put into the mud tank 55 without measuring its weight, and the liquid level of the mud tank 55 is fluidized. Supply is continued until the liquid level control meter 57 detects that the soil production capacity has reached 50 (5000 liters), and the cement milk 40 and the raw material soil 10 are mixed and stirred 56 in the mud-removing tank 55 to fluidize. The fluidized treated soil 1 based on the composition 52 of the treated soil can be manufactured.

  According to the present invention having the above-described configuration, since the measurement of the raw soil performed by the combination of the belt conveyor, the measuring tank, and the load cell is performed by the capacity of the raw soil, the mechanical device for measuring the raw soil (the belt conveyor and the measuring tank). And a load cell), so that these investment costs, transportation, assembly, and disassembly costs to the construction site are not required, and the cost of the fluidized soil can be reduced accordingly. In addition, instead of the measuring tank and the load cell, to detect the volume of the raw soil by detecting the position of the liquid level of the raw soil supplied into the mud tub by the liquid level control meter installed in the mud tub. In addition, the manufacturing process of the fluidized soil can be significantly simplified. Furthermore, it is not necessary to use a belt conveyor that required drive control in accordance with the weight measurement of the raw soil, and the raw soil need only be supplied to the deflocculation tank without the need for weighing and control with a backhoe or the like. .

  Therefore, according to the method and the apparatus for producing fluidized soil according to the present invention, it is possible to efficiently produce fluidized soil at low cost even in a small amount.

DESCRIPTION OF SYMBOLS 1 ... Fluidized soil 3 ... Belt conveyor 5 ... Measuring tank 7 ... Load cell 9 ... Biaxial mixer 10 ... Raw material soil 10a ... Capacity of wet raw material soil 12 ... Water content of raw material soil 15 ... Dry soil 15a ... Dry soil 20 ... Cement 20a ... Cement weight 22 ... Cement silo 25 ... Silo measuring bottle 30 ... Water 30a ... Water amount 33 ... Contained water 33a ... Contained water amount 35 ... Additional water 35a ... Additional water amount 37 ... Clean Water tank 38 Flow meter 39 Submersible pump 40 Cement milk 40a Cement milk capacity 45 Cement milk preparation tank 47 Cement addition 48 Cement milk pump 50 Manufacturing capacity of fluidized treated soil 52 Fluidization Mixing of treated soil 55 ... Mud tank 56 ... Mixing and stirring 57 ... Liquid level control meter 60, 63 ... Raw material storage site 61, 65 ... Backhoe 62 ... Classifier 67 ... Jiteta

In order to solve the problems of the present invention, according to claim 1, in a method for producing a fluidized treated soil in which a raw material soil in a wet state and cement milk are mixed and stirred at a predetermined ratio, the mixing and production capacity of the fluidized treated soil are determined. Based on the weight of the cement and the amount of water contained in the fluidized treated soil are determined based on the amount of water obtained by subtracting the amount of water contained in the raw material soil from the determined amount of water as additional water. Cement milk is made with cement and stored in a mud tank, and wet soil is supplied to the cement milk in the mud tank until the capacity of the mud tank reaches the production capacity of fluidized treated soil. the method for producing a fluidized treated soil for mixing and stirring the cement milk and raw soil material in a wet state in a bath that provides basis.

According to the second aspect of the present invention, there is provided a method for supplying a raw material soil in a wet state to a mud-removing tank up to the liquid level position of the mud-removing tank corresponding to the production capacity of the fluidized soil .

Furthermore , a third aspect of the present invention provides a method for detecting a liquid level position of a wet raw material soil in a deflocculation tank by a liquid level control meter installed in the deflocculation tank.

According to a fourth aspect of the present invention, there is provided a fluidized soil production apparatus for mixing and stirring a wet raw material soil and cement milk at a predetermined ratio, the cement fluid having a capacity corresponding to the production capacity of the fluidized treated soil. A liquid level control meter that manages the liquid level in the dewatering tank for the wet raw material soil supplied to the dewatering tank storing cement milk by the production capacity of the fluidized treated soil, Provided is an apparatus for producing fluidized treated soil, comprising mixing and stirring means for mixing and stirring cement milk and wet raw material soil in a mud tank.

According to a fifth aspect of the present invention, there is provided a fluidized soil production apparatus for mixing and stirring a wet raw material soil and cement milk at a predetermined ratio, wherein the cement silo stores cement and the silo weighs the weight of cement. A bottle, a fresh water tank for storing additional water, a flow meter for measuring the flow rate of the additional water, a cement milk liquid tank for producing cement milk, and a demug tank for producing fluidized soil. And a liquid level control meter for detecting the liquid level in the deflocculation tank, and means for mixing and stirring the inside of the deflocculation tank, corresponding to the production capacity of the fluidized treated soil produced in the cement milk producing tank. A volume of cement milk is stored in the deflocculation tank, and the wet raw material soil having a capacity corresponding to the production capacity of the fluidized soil is converted to a capacity corresponding to the production capacity of the fluidized soil. Until it is detected by the liquid level controller, Cement milk and raw soil material in a wet state in the solutions mud tank are stirred together in a total stirring means to provide a manufacturing apparatus for fluidizing treated soil to produce a fluidizing treated soil.

Claims (8)

In the method for producing a fluidized treated soil in which the raw material soil in a wet state and cement milk are mixed and stirred at a predetermined ratio,
A method for producing a fluidized soil, wherein the ratio between the wet raw material soil and the cement milk is determined by a volume ratio to the production capacity of the fluidized soil.   A volume of cement milk corresponding to the production capacity of the fluidized soil is stored in the deflocculation tank, and then the wet raw material soil is supplied into the deflocculation tank until the production capacity of the fluidized soil is reached. The method for producing a fluidized soil according to claim 1, wherein the cement milk and the raw material soil in a wet state are mixed and stirred in a mud tank. Based on the composition and production capacity of the fluidized soil, determine the weight and amount of cement contained in the fluidized soil,
The amount of water obtained by subtracting the amount of water contained in the raw material soil from the determined amount of water is used as additional water, and the additional water and the determined weight of cement are used to make a liquid cement milk and stored in a deflocculation tank.
Supply the wet raw material soil to the cement milk in the deflocculation tank until the inside of the deflocculation tank reaches the production capacity of the fluidized treated soil, and mix and stir the cement milk and the wet raw material soil in the deflocculation tank. Item 4. The method for producing a fluidized soil according to Item 1.   The method for producing a fluidized soil according to claim 2 or 3, wherein the raw material soil in a wet state is supplied to the deflocculating tank up to a liquid level position of the deflocculating tank corresponding to the production capacity of the fluidized treated soil.   The method for producing a fluidized soil according to claim 4, wherein the liquid level position of the raw material soil in the wet state in the deflocculation tank is detected by a liquid level control meter installed in the deflocculation tank.   Cement for producing cement milk based on production capacity of fluidized soil, blending of fluidized soil, amount of cement added, moisture content of raw soil in wet state, true specific gravity of raw soil, true specific gravity of cement 6. The method for producing a fluidized soil according to claim 3, wherein the weight of the water and the amount of additional water are determined. A fluidized treated soil manufacturing apparatus that mixes and agitates a wet raw material soil and cement milk at a predetermined ratio,
The liquid level in the mud tank for storing the cement milk with the capacity corresponding to the production capacity of the fluidized treated soil and the liquid state in the mud tank for the wet raw material supplied to the mud tank storing the cement milk And a mixing and stirring means for mixing and stirring the cement milk and the wet raw material soil in the deflocculation tank. . A fluidized treated soil manufacturing apparatus that mixes and agitates a wet raw material soil and cement milk at a predetermined ratio,
A cement silo for storing cement, a silo weighing bottle for measuring the weight of cement, a fresh water tank for storing additional water, a flow meter for measuring the flow rate of additional water, and a cement milk preparation for preparing cement milk. A liquid tank, a deflocculation tank for producing fluidized soil, a liquid level control meter for detecting the liquid level in the deflocculation tank, and means for mixing and stirring the inside of the deflocculation tank,
A volume of cement milk corresponding to the production capacity of fluidized soil produced in the cement milk production tank is stored in the mud crushing tank, and the raw material soil in a wet state corresponding to the production capacity of fluidized soil is stored. Supply until the liquid level in the mud tank reaches the volume corresponding to the production capacity of the fluidized treated soil by the liquid level controller, and mix with the cement milk in the mud tank and the wet raw material soil by the mixing and stirring means. For producing fluidized treated soil by mixing and stirring.

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