JP7451471B2 - Method for producing cavity filling material and apparatus for producing the same - Google Patents

Description

The present invention relates to a method for manufacturing a cavity filling material and an apparatus for manufacturing the same, and in particular, a method for manufacturing a cavity filling material that can use different materials to be input depending on the type of cavity filling material, and can change work efficiency as necessary. Regarding manufacturing equipment.

Various underground cavities remain underground, including the remains of mining for coal and lignite, the remains of quarries, and the remains of underground bunkers. These underground cavities may cause cave-ins or ground subsidence due to the effects of earthquakes, etc., so when constructing structures on the ground where underground cavities remain, it is necessary to fill them with filler material in advance to prevent cave-ins. It is necessary to perform cavity filling to prevent.

Underground cavities often collect groundwater or rainwater that has flowed in, so the filling material must be a material that does not cause separation of components or elution of impurities even in water. In addition, highly fluid filling materials are effective in filling underground cavities without gaps, but if the underground cavity is large, highly fluid filling materials can spread over a wide area, not just within the required area. As a result, excessive filling material is required, which increases construction costs.
Therefore, a filling method is proposed in which a filler containing ingredients that suppress fluidity is filled in advance at the outer edge of the area that requires filling, and then the inner edge is filled with a highly fluid filler. being developed.

Patent Document 1 relates to a filling method in which two types of fillers are used, and Patent Document 1 discloses that the outer periphery of the filling area of an underground cavity is filled with a gel-like material with relatively low fluidity. A method for filling an underground cavity is disclosed in which the cavity is closed by injecting an outer circumferential filler, and the inner circumferential region of the cave is filled with a filler having a relatively higher initial fluidity than the outer circumferential filler.

In the invention described in Patent Document 1, as a component of the filler, silica sand and a clay mixture whose constituent minerals are quartz, feldspar, and kaolin, which are produced as by-products in the manufacturing process of fireclay used as a raw material for ceramics such as firebricks, are used. This is fine-grained silica sand, collectively referred to as "Kira," and uses Kira sand and Kira clay, which have different mixing ratios of fine-grained silica sand and clay, water glass, a cement-based solidifying agent, and water. However, with this combination of ingredients, it was found that there was a problem in stably producing a filler with low fluidity, that is , high viscosity, using ordinary kneading equipment . A manufacturing method has been developed.

Patent Document 2 describes a method for manufacturing soil slurry material with high concentration and high specific gravity using Kira wood, and when mixing and stirring water with Kira wood, a trace amount of water glass is added to make the slurry material highly concentrated. a kneading process to produce a slurry material that maintains fluidity while maintaining fluidity, a concentration adjustment process to adjust the slurry material to the desired concentration and specific gravity, and a solidification process in which a predetermined amount of water glass necessary for gelation is added and stirred. A manufacturing method is disclosed that includes a preparation step and a mixing gelling step of conveying the material to a filling section while mixing it with a cementitious solidifying material.

The method of filling a cavity by limiting the filling area as in the invention of Patent Document 1 using a filler manufactured by the manufacturing method of Patent Document 2 has been applied to many underground cavities and has achieved good results. However, the water glass used in this construction method is relatively expensive, so there are cases where a large amount of water glass is used, such as when filling a cavity in an area with a long outer circumference, and the material cost becomes an issue. ing. As a countermeasure to this problem, technology has been developed to reduce the amount of water glass used.

Patent Document 3 describes a second end filler that has higher fluidity due to a smaller amount of water glass added than the end filler, which is filled in the outer periphery of the area that requires filling. A second end filling material is prepared before the end filling material is filled, and an end filling material is filled from above to form a partition wall surrounding the filling area, and a middle filling is performed in the partition wall. An underground cavity filling method is disclosed.

In this way, due to the need for cost reduction, the types of fillers are increasing, and filling materials are also changing toward not using water glass, so the manufacturing method and manufacturing equipment described in Patent Document 2 can be used flexibly depending on the material. There are also emerging issues that make it difficult to do so. In addition, if water glass is uniformly added during kneading as in the manufacturing method of Patent Document 2, there is a problem that sand particles and clay particles tend to precipitate once the operation is stopped and a period of time is left. There is. Therefore, there is a need to provide a method for manufacturing a cavity filler that efficiently manufactures the cavity filler by using different input materials, such as whether water glass is added or not, depending on the type of the cavity filler.

Japanese Patent Application Publication No. 2002-81054 Patent No. 4000393 Japanese Patent Application Publication No. 2019-15098

The present invention has been made in view of the above-mentioned problems in the conventional method for manufacturing cavity filling materials, and an object of the present invention is to use different materials to be input depending on the type of cavity filling material, and to An object of the present invention is to provide a method for manufacturing a cavity filling material and an apparatus for manufacturing the same, which can change work efficiency.

The method for manufacturing a cavity filling material according to the present invention, which has been made to achieve the above object , involves manufacturing different cavity filling materials by adjusting the composition of materials, including the presence or absence of water glass, depending on the type of cavity filling material to be manufactured. The method includes a kneading step of supplying clay filler, sand filler, and water to a filler material mixing tank, and kneading the supplied materials to produce a slurry material, and a cement-based solidifying agent and water. a cement milk production step of producing cement milk by kneading the mixture , and adding the cement milk or cement-based solidifying agent selected according to the type of the cavity filler to be produced to the slurry material produced in the kneading step. A concentration adjustment step in which a predetermined amount of water glass necessary for gelation by mixing and water is added and mixed to adjust to a slurry material with a desired concentration and specific gravity, and in the concentration adjustment step, the water glass is When added, a filler mixing step of supplying and mixing the slurry material obtained in the concentration adjustment step and the cement milk obtained in the cement milk production step to a continuous mixer, and the concentration adjustment step. or a filler discharging step of discharging the filler, which is a slurry material containing the cement milk obtained in the filler mixing step, into an on-site injection port, and the kneading step includes an end filler or an end filler. In the case of application as a second end filler in which the amount of water glass added is smaller than that of the raw material, if the kneading time is to be earlier than the predetermined kneading time, water glass is further added to the supplied material and kneaded , and the above-mentioned When water glass is added in the kneading step, the amount of water glass added in the concentration adjustment step is the amount obtained by subtracting the amount added in the kneading step from the predetermined amount required for gelation. .

The filling material manufacturing apparatus according to the present invention, which has been made to achieve the above object , provides a method for manufacturing the cavity filling material by adjusting the composition of the materials, including the presence or absence of water glass, depending on the type of the cavity filling material to be manufactured. This is a filler manufacturing device used for manufacturing slurry, which includes a filler mixing tank that kneads clay filler, sand filler, and water to produce slurry material, and a filler material mixing tank that kneads cement-based solidifying agent and water to produce cement. A cement milk plant that produces milk, and gelation by mixing the slurry material produced in the Kira material mixing tank with the cement milk or cement-based solidifying material selected according to the type of cavity filling material to be produced. a concentration adjustment tank that adds and mixes water and a predetermined amount of water glass required for the slurry to obtain a slurry material with a desired concentration and specific gravity ; a continuous mixer; and a continuous mixer; and a filling pump that discharges a filler, which is a slurry material containing cement milk, to an on-site injection port, and when water glass is added to the concentration adjustment tank, the continuous mixer mixes the slurry adjusted in the concentration adjustment tank. The method is characterized in that the material and the cement milk are mixed and discharged .

Each of the clear wood mixing tanks has a rectangular shape, and has a plurality of water tanks connected to each other, each of which has an outer blade extending from near the inner wall on each side toward the center of the rectangle, and a rotary blade that rotates inside the outer blade. The method includes a square water tank, and the plurality of square water tanks kneads the slurry material by sequentially repeating a process in which the kneaded slurry material is transferred to the next square water tank after the kneading process in one square water tank is completed. is preferred.

Preferably, the apparatus further includes a control unit that controls the amount of water and water glass to be supplied in accordance with the mixing ratio of materials to be added to the mixing tank and the setting input of the presence or absence of water glass.

According to the method for producing a cavity filler and the apparatus for producing the same according to the present invention, a filler that needs to be gelled by adding water glass, such as an end filler or a second end filler, and a filler that needs to be gelled by adding water glass. The middle filling material that does not contain additives is made separately, and the end filling material and second end filling material, which contains water glass and must be injected immediately on-site because it begins to gel after mixing with cement milk, are continuously mixed immediately before on-site injection. The filling material, which does not contain water glass, is mixed in a container and the filling material, which does not contain water glass, is mixed with cement milk in a concentration adjustment tank to adjust the concentration and then injected on-site, so it is possible to manufacture the appropriate filling material according to the type of injection material. It becomes possible.

Further, according to the method for producing a cavity filler according to the present invention, in the case of an end filler or a second end filler, when a large amount of filler is required at once, that is, a short kneading time is sufficient. If it is necessary to increase the amount of slurry produced as a slurry material that has been thoroughly kneaded , the efficiency of filler production can be improved by primarily adding a portion of water glass in the clear material mixing tank.

Further, according to the cavity filling material manufacturing device according to the present invention, the control unit provided in the cavity filling material manufacturing device Since the input amount of water glass and water is appropriately controlled, it is possible to produce a filler with stable quality.

1 is a diagram schematically showing the overall configuration of a filler manufacturing apparatus according to an embodiment of the present invention. FIG. 3 is a diagram for explaining the flow of manufacturing an end filler or a second end filler according to an embodiment of the present invention. FIG. 2 is a diagram for explaining the flow of manufacturing a filling material according to an embodiment of the present invention. 1 is a diagram schematically showing the structure of a kill material mixing tank according to an embodiment of the present invention. It is a flowchart for explaining the flow of manufacturing an end filler or a second end filler according to an embodiment of the present invention. It is a flow chart for explaining the flow of manufacturing a filling material according to an embodiment of the present invention.

Next, a specific example of a method for manufacturing a cavity filling material and an apparatus for manufacturing the same according to the present invention will be described in detail with reference to the drawings.
FIG. 1 is a diagram schematically showing the overall configuration of a filler manufacturing apparatus according to an embodiment of the present invention.
Referring to FIG. 1, a filler manufacturing apparatus 1 according to an embodiment of the present invention includes an earth-based slurry manufacturing line 10 and a cement solidification material manufacturing line 20.
The soil-based slurry manufacturing line 10 includes a stockyard 11 for storing materials, a solidified material feeder 12 for supplying materials, a solidified material mixing tank 13, and a concentration adjustment tank 14, and the solidifying material manufacturing line 20 includes a cement-based solidifying material. It is equipped with a silo 21 and a cement milk plant 22.

The filling material manufacturing apparatus 1 according to the embodiment of the present invention is capable of manufacturing various cavity filling materials (end filling material, second end filling material, middle filling material) whose types have been increasing due to the need to reduce costs related to cavity filling. In response to this, it is possible to create different cavity filling materials by switching the material transfer route depending on the type of cavity filling material to be produced, and it is also possible to create different types of cavity filling materials, such as edge filling materials that are filled around the outer periphery of the area to be filled. In the case of the second end filling material, the device is capable of efficiently manufacturing the cavity filling material by adjusting the blend of materials depending on whether a large amount of the cavity filling material is needed at one time.

The soil-based slurry manufacturing line 10 is a line for manufacturing a slurry-like intermediate material by mixing materials other than the cement solidifying agent for producing cement milk with water among the raw materials for the cavity filling material. Depending on the type of material, the material may be processed to the point where it is finally mixed with cement milk and used as a cavity filling material.

The stockyard 11 is a storage area that temporarily stores clay filler 101 and sand filler 102 as materials. Kira materials such as Clay Kira 101 and Sand Kira 102 are mainly made of silica sand and clay mixtures whose constituent minerals are quartz, feldspar, and kaolin, which are produced as by-products in the manufacturing process of fireclay used as raw materials for ceramics such as firebricks. It is fine-grained silica sand. The clay filler 101 and the sand filler 102 are classified based on the mixing ratio of fine silica sand and clay, and the clay filler 101 has a higher clay ratio than the sand filler 102. As an example, clay filler 101 has a clay content of about 50%, and sand filler 102 has a clay content of about 25%. The mixing ratio of fine silica sand and clay is not strict, and the mixing ratio is not limited to this.

In addition to this, dehydrated clay generated as a by-product during the sorting of mountain gravel at a gravel factory is also used as the clay filler 101. Further, the sand clearer 102 is not limited to silica sand factories, but may also be used for dehydrated clay, stone powder, etc. generated during quarry sorting in quarry factories.
In any case, the Kira material does not contain harmful substances and is produced as a by-product, so it is a safe and inexpensive material and is suitable as a material for cavity filling material. Clay Kira 101 and Sand Kira 102 have different moisture contents depending on the production area and manufacturing method. Therefore, when determining the blending amount of materials for producing various cavity fillers, the moisture content of the materials is affected, so clay filler 101 and sand filler 102 are used whose moisture content has been checked in advance.

The filler material feeder 12 is a device for supplying the clay filler 101 and the sand filler 102 stored in the stockyard 11 to the filler material mixing tank 13. Depending on the configuration of the filler manufacturing device 1, the finished material feeder 12 may be a belt conveyor provided to connect the stockyard 11 and the mixed material mixing tank 13; The feeder 12 is a backhoe. The amount of clay filler 101 and sand filler 102 required for the cavity filler manufactured by a backhoe is taken out from the stockyard 11 and supplied to the filler material mixing tank 13. At this time, instead of directly supplying the clay filler 101 and sand filler 102 to the filler material mixing tank 13, the clay filler 101 and sand filler 102 taken out before supply are mixed to some extent by a backhoe, and then the filler material mixing tank 13 It is possible to prevent imbalance due to insufficient mixing of materials.

The filler material mixing tank 13 is a device that adds water to clay filler 101 and sand filler 102 and kneads them to produce a slurry material having a predetermined concentration. Water for kneading is supplied to the filler material mixing tank 13 through a water supply pipe by a water supply tank 30 and a transfer pump 81 provided in the filler manufacturing apparatus 1. The amount of water supplied here is determined by the type of cavity filler, the amount of material to be supplied, and the water content, but is ultimately controlled by the specific gravity of the kneaded slurry material. That is, the amount of water supplied is controlled so that the specific gravity of the kneaded slurry material falls within a predetermined range.

The kill material mixing tank 13 is further connected to a water glass storage tank 40 provided in the filler manufacturing apparatus 1 and a water glass supply pipe through which water glass is supplied by a transfer pump 84 .
Water glass is composed of silicon dioxide (SiO ₂ ) and sodium oxide (Na ₂ O), and when mixed with a cement solidifying agent, a gelation reaction occurs in a relatively short time. The end filler and the second end filler, which are filled in the outer periphery of the cavity filling area in advance in the form of a wall, are used to suppress the spread of the hollow filler that is filled later. Water glass is required to have a low fluidity, and water glass is a very effective material as a material for such a cavity filler with low fluidity. However, since water glass is not a cheap material, the second end filler was devised as a material to be filled under the end filler by reducing the amount of water glass added to the end filler in order to reduce construction costs. It is something.

Water glass does not gel unless it is mixed with a cementitious solidifying agent, and when mixed when preparing a slurry material in the clearing material mixing tank 13, it has the property of reducing the viscosity of the kneaded material. Therefore, when water glass is added, the efficiency of kneading in the clear material mixing tank 13 increases, and the amount of mud produced increases. Although it depends on the composition of the materials to be kneaded , in one embodiment, the amount of water glass added in the filler material mixing tank 13 is in the range of 0.2 to 2% based on the total amount of clay filler 101 and sand filler 102. . As an example, by adding water glass, the production efficiency of the slurry material increases to about 1.5 times that in the case where water glass is not added.

However, when water glass is added and kneaded , separation of the materials after kneading tends to occur. Therefore, in the embodiment of the present invention, if the amount of slurry material to be filled at one time is small and the slurry material stagnates in the clear material mixing tank 13 for several days after work is interrupted, water glass is not added and a large amount is added at once. The slurry material is operated to increase the kneading efficiency by adding water glass when it is necessary to make the end filler or the second end filler.

The water glass added to the end filler or the second end filler is to be mixed with cement milk and gelled, but all the amount necessary for gelation is added to the clear material mixing tank. If it is added during kneading in step 13, separation of the materials will likely occur, so the amount added during kneading is such that a part of the amount required for gelation is added first. The remaining water glass is preferably added at the next stage of concentration adjustment, just before final mixing with cement milk.
The slurry material produced in the clear material mixing tank 13 is transferred to the concentration adjustment tank 14 by the transfer pump 83.

In the concentration adjustment tank 14, the slurry material is adjusted to have a predetermined concentration and specific gravity depending on the type of cavity filler. When producing the end filler or the second end filler, add a predetermined amount of water glass necessary for gelation by mixing with the cement-based solidifying material to the slurry material produced in the Kira material mixing tank 13. Mix. When kneading in the Kira material mixing tank 13, in order to make the kneading time faster than the predetermined kneading time, water glass is added and kneaded , the amount of water glass added in the concentration adjustment tank 14 is The amount is determined by subtracting the amount added in the kneading process in the filler material mixing tank 13 from the predetermined amount required for gelation. When kneading is performed in the Kira material mixing tank 13 without adding water glass, the entire predetermined amount of water glass required for gelation is added and mixed.
The amount of water glass finally added varies depending on the formulation, but for example, in the case of the end filler, it is about 10% of the total amount of clay filler 101 and sand filler 102, and the amount of water glass added as the second end filler In this case, the amount added is about 1/6 to 1/5 of the amount of end filler added.

When making a filling material, water glass is not added. Therefore, even if it is mixed with cement milk at this stage, gelation does not start immediately, and there are fewer time constraints until it is filled into underground cavities. Therefore, in the case of filling material, the slurry material produced in the clear material mixing tank 13 and the cement milk produced in the cement solidifying material production line 20 are mixed in the concentration adjustment tank 14, and a finished material that can be filled into underground cavities is prepared. A filling material is prepared in the following state.

In the concentration adjustment tank 14, water is added to adjust the concentration so as to improve the accuracy of the specific gravity of the final slurry material, whether it is an end filler, a second end filler, or a middle filler. . The specific gravity of the slurry material is managed by controlling the amount of water supplied even during the kneading stage of preparing the slurry material in the clear material mixing tank 13. It's difficult to get it out. Therefore, in one embodiment, in the initial kneading stage, the slurry material is prepared in a controlled range in which the specific gravity is slightly higher than the final target specific gravity, that is, the amount of water is slightly smaller, and the concentration in the concentration adjustment tank 14 is Water is added during the adjustment stage to adjust the specific gravity.

The slurry material for the end filler or the second end filler, to which water glass has been added in the concentration adjustment tank 14 and whose concentration and specific gravity have been adjusted, is mixed with the cement milk produced in the cement solidification material production line 20. The mixture is transferred to a continuous mixer 50 included in the filler manufacturing apparatus 1. On the other hand, the filling material mixed with cement milk in the concentration adjustment tank 14 to adjust its concentration and specific gravity is filled into the underground cavity from the on-site injection port 70 by the filling pump 80.

The cement solidifying material silo 21 of the cement solidifying material manufacturing line 20 is a container for storing the cement solidifying material, and as the cement solidifying material silo 21, a mobile vertical silo or the like is applied. A required amount of the cement solidifying material stored in the cement solidifying material silo 21 is discharged by a discharge device such as a screw feeder.

The cement milk plant 22 mixes the cement solidifying material supplied from the cement solidifying material silo 21 with water to produce cement milk. Water is supplied from the water supply tank 30 via a transfer pump 82 through a water supply pipe.

The destination of the cement milk produced in the cement milk plant 22 is changed depending on the type of cavity filling material to be combined. If the cavity filler is an end filler or a second end filler, gelation will occur and it is necessary to mix the filler immediately before filling the underground cavity to complete the filler. Supplied.
When the cavity filler is a hollow filler, the produced cement milk is transferred to the concentration adjustment tank 14 and mixed with a slurry material containing clay filler 101 and sand filler 102.

As described above, the filling material manufacturing apparatus 1 switches the transfer route and combination of materials depending on the type of cavity filling material to be manufactured, and is provided with the control section 60 in order to reduce human errors. The control unit 60 controls the filling pump 80, transfer pumps (81, 82, 83, 84, 85) and electromagnetic pumps provided in the transfer piping for material transfer that connects each component of the filler manufacturing device 1, such as the kill material mixing tank 13, etc. Controls the valve 90 and the like.
Further, the control unit 60 is configured to receive input of the blending ratio of the materials and the initial water content of the materials, automatically calculate the specific gravity, and adjust the amount of water to be supplied based on the calculation.

In one embodiment, the control unit 60 includes a control board equipped with a microcomputer, etc., and an operation panel, and the operation panel includes information on the type of cavity filling material to be created and the amount of water used during mixing in the filler material mixing tank 13. The control unit 60 is equipped with an input unit that accepts inputs such as whether glass is added or not. For example, when an end filler is selected as the type of cavity filler and whether water glass is added to the kill material mixing tank 13, the control unit 60 , determine the amount of water and water glass required for the end filling material based on the amount of the end filling material to be produced, and transfer the water to the clear material mixing tank 13 by the transfer pump 81 so that the determined supply amount is obtained. The supply of water and the supply of water glass by the transfer pump 84 are controlled.

The control unit 60 also controls the transfer pump to supply the concentration adjustment tank 14 with the remaining amount of water glass that is not supplied to the Kirin material mixing tank 13 out of the amount of water glass required for gelation. 84, and based on the amount of water to be further supplied, which is determined from the difference between the specific gravity of the slurry material produced in the clear material mixing tank 13 and the specific gravity of the final target end filler. The solenoid valve 90 and transfer pump 81 are controlled to supply the necessary amount of water.

When the control unit 60 selects the end filler and selects not to add water glass to the Kirin material mixing tank 13, the control unit 60 does not add water glass to the Kirin material mixing tank 13, and adds gelation to the concentration adjustment tank 14. The transfer pump 84 is controlled so as to supply the entire amount of water glass required. In order to adjust the concentration and specific gravity, the solenoid valve 90 and transfer pump 81 are further controlled based on the amount of water to be supplied to supply the required amount of water.

In FIG. 1, only the water supply pipe connected from the water supply tank 30 to the concentration adjustment tank 14 is a solenoid valve 90, and the other valves provided in the main parts of the transfer pipe are shown as manual on-off valves 91, but this is a one-stop valve. In this embodiment, the valves provided in each of these pipes may be either electromagnetic valves 90 or manual on-off valves 91.

FIG. 2 is a diagram for explaining the flow of manufacturing the end filling material or the second end filling material according to the embodiment of the present invention, and FIG. 3 is a diagram for explaining the manufacturing flow of the filling material according to the embodiment of the present invention FIG. 2 is a diagram for explaining the flow.
Referring to FIGS. 2 and 3, the basic configuration is the same as in FIG. 1, but in FIG. 2, parts related to the manufacture of the end filler or the second end filler are indicated by thick arrows, and in FIG. Parts related to the production of the filling material are indicated by thick arrows. Since the functions of the basic constituent elements are the same as those explained in FIG. 1, the explanation of FIGS. 2 and 3 will be omitted.

The difference between FIGS. 2 and 3 is whether or not water glass is supplied and whether or not a continuous mixer 50 is used. When the end filler or the second end filler is filled into an underground cavity, if it flows and spreads over a wide area, it will not be easy to fill the outer periphery of the area to be filled into the cavity in the form of a wall. Therefore, water glass is mixed in the end filler or the second end filler to give it the property of gelling in a short time when mixed with cement milk, thereby suppressing flow spread during filling. Since gelation starts in a short time, a continuous mixer 50 is required to mix immediately before filling the underground cavity.
In the case of manufacturing the filling material shown in FIG. 3, since water glass, which increases manufacturing costs, is not used, the continuous mixer 50 is also not used.

FIG. 4 is a diagram schematically showing the structure of the finished material mixing tank according to the embodiment of the present invention, and FIG. 4(a) is a schematic diagram showing the planar structure of the finished material mixing tank seen from the top. , FIG. 4(b) is a schematic diagram showing the internal structure seen from the side.
Referring to FIG. 4, each of the kill material mixing tanks 13 according to the embodiment of the present invention has a rectangular shape, and has outer blades 16 that extend from near the inner wall on each side toward the center of the rectangle, and rotates inside the outer blades 16. It includes a plurality of rectangular aquariums in which a plurality of rectangular aquariums 15 each having a rotating blade 17 are connected. Although FIG. 4A shows a rectangular aquarium in which three rectangular aquariums 15 are connected, the number of rectangular aquariums 15 is not limited to this, and may be more or less than three.

These plurality of rectangular water tanks 15 are equipped with drive motors 18 that independently drive the rotary blades 17, but instead of producing slurry material independently, for example, the first rectangular water tank 15 at one end, Materials such as clay filler 101, sand filler 102, water 103, and water glass 104 as needed are put in, and the materials kneaded in the first square water tank 15 overflow and are transferred to the adjacent second square water tank 15. Then, the mixture is further kneaded in the second rectangular water tank 15. The material kneaded in the second rectangular water tank 15 overflows and moves to the adjacent third rectangular water tank 15, where it is further kneaded and finally discharged as a kneaded slurry material 110. In this way, the multiple rectangular water tanks function as one continuous treatment mixing tank connected in series.

It is easy to imagine a cylindrical tank shape as a vertical mixing tank equipped with rotary blades 17 that rotate at the center, but as a result of trial production, the outer blades 16 have a rectangular outer shape and outer blades 16 extending from near the inner wall on each side toward the center of the rectangle. It has been found that when combined, a turbulent flow of slurry material is generated at each corner and the efficiency of material kneading is improved. It is designated as tank 13.

FIG. 5 is a flowchart for explaining the flow of manufacturing an end filler or a second end filler according to an embodiment of the present invention. FIG. 5 is a flowchart corresponding to FIG.
Referring to FIG. 5, in step S500, clay filler 101 and sand filler 102 are supplied from the stockyard 11 to the filler material mixing tank 13 from the filler material feeder 12 such as a backhoe, and water is supplied from the water supply tank 30 to the filler material mixing tank 13.

Next, it is determined whether a large amount of the end filler or the second end filler is needed at one time, that is, whether the kneading time needs to be shortened to improve work efficiency (step S505).
If it is determined in step S505 that it is necessary to shorten the kneading time, water glass is primarily added to the filler material mixing tank 13 in step S510, and then the supplied materials are kneaded in step S515. On the other hand, if it is determined in step S505 that it is not necessary to shorten the kneading time, the supplied material is kneaded in step S515 without performing the primary addition of water glass.
When the slurry material kneading process in the clear material mixing tank 13 is completed, the completed slurry material is transferred to the concentration adjustment tank 14 in step S520.

The total amount of water glass included in the filler produced as the end filler or the second end filler is the predetermined amount required for gelation, regardless of whether the primary addition of water glass was performed in step S510. is constant. Therefore, the amount of water glass added in the concentration adjustment tank 14 changes depending on whether or not the primary addition of water glass was performed in step S510.

Therefore, in step S525, it is checked whether water glass was primarily added when producing the slurry material. When water glass is primarily added in step S510, in step S530, water glass is added in an amount obtained by subtracting the amount initially added in the kneading process from the predetermined amount required for gelation, and the end filler is added. Alternatively, water is added so that the slurry material for the second end filler has the final required concentration and specific gravity, and the mixture is mixed in the concentration adjustment tank 14 to produce a slurry material whose concentration and specific gravity have been adjusted.

On the other hand, if water glass is not primarily added in the slurry material kneading process in the Kira material mixing tank 13, the predetermined amount of water glass necessary for gelation is added in full in step S535, and then the final Water is added to obtain the required concentration and specific gravity, and the mixture is mixed in the concentration adjustment tank 14 to produce a slurry material whose concentration and specific gravity have been adjusted.

In step S540, the slurry material whose concentration and specific gravity have been adjusted is transferred from the concentration adjustment tank 14 to the continuous mixer 50. The transfer pipe from the concentration adjustment tank 14 branches midway and is connected to the continuous mixer 50 and the on-site injection port 70, but the on-off valve 91 on the on-site injection port 70 side is closed, and the on-off valve 91 on the continuous mixer 50 side is closed. By opening the valve 91, the transfer destination is switched.

In parallel with the processing by the earth-based slurry production line 10 in steps S500 to S540, the cement treatment solidification material production line 20 uses the cement-based solidification material supplied from the cement-based solidification material silo 21 in the cement milk plant 22. Cement milk is prepared by mixing the water supplied from the water tank 30 (step S560).

Next, in conjunction with the transfer of the slurry material whose concentration and specific gravity have been adjusted in step S540, the cement milk produced in step S565 is transferred from the cement milk plant 22 to the continuous mixer 50. The transfer pipe from the cement milk plant 22 is also branched in the middle and divided into a transfer pipe that connects to the concentration adjustment tank 14 and a transfer pipe that connects to the continuous mixer 50. The on-off valve 91 is selectively opened or closed to switch the transfer destination.

The mixture of the slurry material whose concentration and specific gravity have been adjusted and the cement milk to be transferred to the continuous mixer 50 changes depending on the discharge amount of the filling pump 80 and transfer pump 85 provided in each supply pipe, so the control unit 60 adjusts the target. The discharge amounts of the filling pump 80 and the transfer pump 85 are controlled so that the blended amount is as follows.

In the continuous mixer 50, the slurry material whose concentration and specific gravity have been adjusted are mixed with cement milk to create a finished material as an end filler or a second end filler (step S545), and the on-site injection port 70 is discharged to fill an underground cavity (step S550).

FIG. 6 is a flowchart for explaining the flow of manufacturing the filling material according to the embodiment of the present invention. FIG. 6 is a flowchart corresponding to FIG. 3.
Supplying clay filler 101, sand filler 102, and water to filler material mixing tank 13 (step S600) is the same as step S500 in FIG. 5. In the case of a filling material, since water glass is not added, there is no need to judge whether or not water glass is necessary, and the supplied materials are kneaded in step S610.

In step S620, the slurry material produced by the kneading process is transferred to the concentration adjustment tank 14.
While the slurry material is produced in the kneading process, in parallel, the cement treatment solidifying material production line 20 kneads the cement-based solidifying material and water to produce cement milk (step S650).
The produced cement milk is transferred to the concentration adjustment tank 14 in step S660 in conjunction with the transfer of the slurry material to the concentration adjustment tank 14 in step S620.

In the concentration adjustment tank 14, water glass is not added, only the amount of water necessary for concentration and specific gravity adjustment is added, and the slurry material and cement milk are mixed to create a filling material (step S630). The filling material is discharged into the on-site injection port 70 by the filling pump 80 to fill the underground cavity (step S640).

As described above, the filling material manufacturing apparatus 1 according to the embodiment of the present invention is capable of producing different cavity filling materials by switching the material transfer route depending on the type of cavity filling material to be produced. This device is capable of efficiently manufacturing cavity fillers by adjusting the material composition accordingly.

Although the embodiments of the present invention have been described above in detail with reference to the drawings, the present invention is not limited to the above-described embodiments, and can be variously modified without departing from the technical scope of the present invention. It is possible to do so.

1 Filler manufacturing equipment 10 Earth-based slurry production line 11 Stockyard 12 Killer material feeder 13 Killer material mixing tank 14 Concentration adjustment tank 15 Square water tank 16 Outer blade 17 Rotating blade 18 Drive motor 20 Cement solidifying material manufacturing line 21 Cement solidifying material Silo 22 Cement milk plant 30 Water supply tank 40 Water glass storage tank 50 Continuous mixer 60 Control unit 70 On-site injection port 80 Filling pump 81, 82, 83, 84, 85 Transfer pump 90 Solenoid valve 91 Opening/closing valve 101 Clay clearer 102 Sand clearer 103 Water 104 Water glass 110 Slurry material

Claims (4)

A method for manufacturing a cavity filling material by adjusting the composition of materials including the presence or absence of water glass depending on the type of cavity filling material to be manufactured, the method comprising:
a kneading step of supplying clay filler, sand filler, and water to a filler material mixing tank and kneading the supplied materials to produce a slurry material;
A cement milk production process of producing cement milk by kneading a cement-based solidifying agent and water;
The slurry material produced in the kneading step is mixed with either the cement milk or a predetermined amount of water glass necessary for gelation by mixing with a cement-based solidifying agent , which is selected depending on the type of cavity filling material to be produced. , a concentration adjustment step of adding and mixing water to adjust the slurry material to a desired concentration and specific gravity;
When the water glass is added in the concentration adjustment step, the slurry material obtained in the concentration adjustment step and the cement milk obtained in the cement milk production step are supplied to a continuous mixer and mixed. Filler mixing step;
a filler discharge step of discharging the filler, which is a slurry material containing the cement milk obtained in the concentration adjustment step or the filler mixing step, to an on-site injection port;
The kneading step is performed when the kneading time is earlier than the predetermined kneading time in the case of application of the end filler or the second end filler with a smaller amount of water glass added than the end filler. When water glass is further added to and kneaded , and water glass is added in the kneading step, the amount of water glass added in the concentration adjustment step varies from the predetermined amount required for gelation to the amount added in the kneading step. A method for producing a cavity filling material, characterized in that the amount is obtained by subtracting the amount of the filling material. 2. A filling material manufacturing apparatus for use in the method for manufacturing a cavity filling material according to claim 1, wherein the material composition, including the presence or absence of water glass, is adjusted depending on the type of cavity filling material to be manufactured.
A clear material mixing tank for producing slurry material by kneading clay clear, sand clear, and water;
A cement milk plant that produces cement milk by kneading cement-based solidifying material and water;
Adding a predetermined amount of water glass necessary for gelation by mixing the slurry material produced in the clear material mixing tank with the cement milk or cement-based solidifying material selected according to the type of cavity filling material to be produced. and a concentration adjustment tank in which water is added and mixed to adjust the slurry material to a desired concentration and specific gravity;
a continuous mixer;
and a filling pump that discharges a filling material, which is a slurry material containing the cement milk adjusted in the concentration adjustment tank, to an on-site injection port ,
The filler manufacturing device is characterized in that, when water glass is added to the concentration adjustment tank, the continuous mixer mixes and discharges the slurry material adjusted in the concentration adjustment tank and the cement milk. Each of the clear wood mixing tanks has a rectangular shape, and has a plurality of water tanks connected to each other, each of which has an outer blade extending from near the inner wall on each side toward the center of the rectangle, and a rotary blade that rotates inside the outer blade. Including square aquarium,
A claim characterized in that the plurality of rectangular water tanks knead the slurry material by sequentially repeating a process in which the kneaded slurry material is transferred to the next rectangular water tank after the kneading process in one rectangular water tank is completed. Item 2. The filler manufacturing apparatus according to item 2. According to claim 2 or 3, further comprising a control unit that controls the amount of water to be supplied and the amount of water glass to be fed in accordance with a setting input of a blending ratio of materials to be added to the Kirin material mixing tank and the presence or absence of water glass. The filler manufacturing device described.

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