Method for capturing and storing carbon dioxide contained in exhaust gas at foundation construction sites, carbon dioxide capture and storage device, and foundation constructed using said method

Abstract

To provide a method and an apparatus for recovering and storing carbon dioxide in exhaust gas at a foundation construction site, which can recover and store exhaust gas discharged at a foundation construction site for civil engineering, and a foundation constructed using the method.SOLUTION: This method includes an exhaust gas supply step S1 of supplying exhaust gas discharged from at least one motor into ground to be excavated or a pile hole formed in the ground to be excavated so as to mix an excavation liquid or a curable material supplied into the ground or the pile hole, at a foundation construction site. The method may further include an exhaust solidification step S11 of adding a solidification material to an exhaust such as surplus soil and an overflow liquid discharged from the pile hole, and solidifying the exhaust.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to a method for capturing and storing carbon dioxide contained in exhaust gas at a foundation construction site, a carbon dioxide capture and storage device, and a foundation constructed using the method. [Background technology]

[0002] Conventionally, technological development has been conducted to suppress emissions of carbon dioxide, a greenhouse gas. For example, in the field of civil engineering and construction, a technology has been developed to absorb carbon dioxide into a concrete structure as disclosed in Patent Document 1, and a technology has been developed to produce carbonated concrete by reacting carbon dioxide with gamma belite as disclosed in Patent Document 2. The former is a technology to absorb carbon dioxide in the air into a concrete structure, and the latter is a technology to react carbon dioxide contained in the exhaust gas from a thermal power plant with gamma belite. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 4829017 [Patent Document 2] Patent No. 4822373 Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, the need to reduce carbon dioxide emissions has been increasing due to the social spread of the SDGs (Sustainable Development Goals) adopted by the United Nations. In particular, in the civil engineering and construction sector, large amounts of carbon dioxide are emitted during the manufacturing process of clinker, the raw material for cement, so there is great significance in developing technology to reduce carbon dioxide emissions. In view of the above circumstances, an object of the present invention is to provide a method for capturing and storing carbon dioxide in exhaust gas at a foundation construction site for civil engineering and building, a carbon dioxide capture and storage device, and a foundation constructed using said method for capturing and storing carbon dioxide in exhaust gas emitted at the foundation construction site. [Means for solving the problem]

[0005] (1) At least one embodiment of the method for capturing and storing carbon dioxide in exhaust gas from a foundation construction site according to the present invention comprises: The method includes a step of supplying exhaust gas discharged from at least one prime mover into the ground or into a pile hole formed in the ground at a foundation construction site in order to mix the exhaust gas with a drilling fluid or hardening material supplied thereto. 、 In the exhaust gas supplying step, the exhaust gas is supplied to a supply pipe for supplying the drilling fluid or cement milk as the hardenable material into the ground or into the pile hole.

[0006] According to the above configuration (1), by supplying the exhaust gas discharged from the prime mover into the ground or into the pile hole, the carbon dioxide in the exhaust gas is dissolved and reacted with the drilling fluid or hardening material and absorbed. The drilling fluid that has absorbed the carbon dioxide is mixed with the excavated soil or permeates into the ground, and the hardening material that has absorbed the carbon dioxide hardens in the ground or in the pile hole. In this way, the carbon dioxide in the exhaust gas discharged from the prime mover at the foundation construction site is collected and stored in the ground, and as a result, it is possible to suppress the release of the carbon dioxide in the exhaust gas into the atmosphere.

[0007] In addition, at foundation construction sites, the surplus soil, which is a mixture of excavation fluid and excavated soil, is discharged to the ground, and some of the hardening materials including the excavated soil may flow out to the ground as overflow liquid. The surplus soil and overflow liquid are solidified using a solidification material and disposed of as industrial waste. At this time, some of the exhaust gas supplied to the ground or into the pile hole is absorbed by the surplus soil or overflow liquid and discharged to the ground, and is disposed of as included in the industrial waste. If the discharged materials such as the surplus soil and overflow liquid discharged from the pile hole are solidified and treated in this way, it is possible to suppress the carbon dioxide in the exhaust gas from being released into the atmosphere. On the other hand, when a hardening material whose main component is cement absorbs carbon dioxide and becomes carbonated, it becomes stronger than when it is not carbonated, improving the performance of the foundation. In addition, by supplying exhaust gas to the supply pipe of the drilling fluid or cement milk, the drilling fluid or cement milk and the exhaust gas can be efficiently mixed. As a result, the carbon dioxide in the exhaust gas can be efficiently dissolved and reacted with the drilling fluid or cement milk, and the carbon dioxide in the exhaust gas can be prevented from being released into the atmosphere.

[0008] (2) In some embodiments, in the above configuration (1), One of the at least one prime mover is a prime mover of a pile driver or a prime mover of a generator mounted on the pile driver. do.

[0009] According to the above configuration (2), the exhaust gas discharged from the prime mover of the pile driver or the prime mover of the generator mounted on the pile driver is supplied to the supply pipe of the drilling fluid or the cement milk, so that the configuration of the path for supplying the exhaust gas can be simplified. 。

[0010] (3) In some embodiments, in the above configuration (1) or (2), One of the at least one prime movers is a prime mover of a generator that supplies power to a cement milk plant for mixing water and cement to prepare cement milk as the hardenable material; The method further includes an exhaust gas mixing step of mixing exhaust gas discharged from a prime mover of the generator with the water, a mixture of the water and the cement, or the cement milk.

[0011] According to the above configuration (3), the exhaust gas discharged from the prime mover of the generator supplying power to the cement milk plant is mixed with water, a mixture of water and cement, or cement milk, so that the carbon dioxide in the exhaust gas dissolves and reacts with the water, the mixture of water and cement, or the cement milk and is absorbed. Here, the carbon dioxide dissolved and reacted with the water is dissolved and reacted with the cement by mixing the water and cement, and is absorbed by the cement milk. Therefore, the carbon dioxide in the exhaust gas mixed with the water is dissolved and reacted with the cement milk and is absorbed in the same manner as when it is mixed with the cement milk, and the exhaust gas is supplied to the ground or pile hole in a state contained in the cement milk. Then, the cement milk that has absorbed the carbon dioxide is mixed with the excavated soil and hardened, and the carbon dioxide in the exhaust gas discharged from the generator at the foundation construction site is collected and stored in the ground. As a result, it is possible to suppress the carbon dioxide in the exhaust gas from being released into the atmosphere.

[0012] (4) In some embodiments, in any one of the above configurations (1) to (3), One of the at least one prime mover is a prime mover of a pile driver or a prime mover of a generator mounted on the pile driver; The method includes a stirring and mixing process for stirring and mixing the excavated soil from the ground and the cement milk using the pile driver.

[0013] According to the above configuration (4), by stirring and mixing the excavated soil and the cement milk, the exhaust gas is dispersed, and a decrease in the strength of the soil cement formed by the excavated soil and the cement milk can be suppressed.

[0014] (5) At least one embodiment of the carbon dioxide capture device for exhaust gas at a foundation construction site according to the present invention is In a foundation construction site, in order to mix the exhaust gas discharged from at least one prime mover with the drilling fluid or hardening material supplied into the ground to be excavated or into a pile hole formed in the ground to be excavated, the exhaust gas supplying means supplies the exhaust gas into the ground or into the pile hole. 、 The exhaust gas supplying means has a pump for supplying the exhaust gas to a supply pipe for supplying the drilling fluid or cement milk as the hardenable material into the ground or into the pile hole.

[0015] According to the above configuration (5), the exhaust gas supply means supplies the exhaust gas discharged from the prime mover into the ground or into the pile hole, whereby the carbon dioxide in the exhaust gas dissolves in and reacts with the drilling fluid or the hardening material and is absorbed, and the exhaust gas is supplied to the ground or the pile hole in a state contained in the drilling fluid. Then, the drilling fluid that has absorbed the carbon dioxide is mixed with the excavated soil or permeates into the ground, and the hardening material that has absorbed the carbon dioxide hardens in the ground or in the pile hole. In this way, the carbon dioxide in the exhaust gas discharged from the prime mover at the foundation construction site is collected and stored in the ground, and as a result, it is possible to suppress the release of the carbon dioxide in the exhaust gas into the atmosphere.

[0016] In addition, at foundation construction sites, the surplus soil, which is a mixture of excavation fluid and excavated soil, is discharged to the ground, and some of the hardening materials including the excavated soil may flow out to the ground as overflow liquid. The surplus soil and overflow liquid are solidified using a solidification material and disposed of as industrial waste. At this time, some of the exhaust gas supplied to the ground or into the pile hole is absorbed by the surplus soil or overflow liquid and discharged to the ground, and is disposed of as included in the industrial waste. If the discharged materials such as the surplus soil and overflow liquid discharged from the pile hole are solidified and treated in this way, it is possible to suppress the carbon dioxide in the exhaust gas from being released into the atmosphere. On the other hand, when a hardening material whose main component is cement absorbs carbon dioxide and becomes carbonated, it becomes stronger than when it is not carbonated, improving the performance of the foundation. Furthermore, by supplying the exhaust gas to the supply pipe for the drilling fluid or the cement milk by means of a pump, the configuration of a path for supplying the exhaust gas can be simplified. In addition, by supplying exhaust gas to the supply pipe of the drilling fluid or cement milk, the drilling fluid or cement milk and the exhaust gas can be efficiently mixed. As a result, the carbon dioxide in the exhaust gas can be efficiently dissolved and reacted with the drilling fluid or cement milk, and the carbon dioxide in the exhaust gas can be prevented from being released into the atmosphere.

[0017] (6) In some embodiments, in the above configuration (5), One of the at least one prime movers is a prime mover of a pile driver or a prime mover of a generator mounted on the pile driver. be .

[0019] (7) In some embodiments, in the above configuration (5) or (6), One of the at least one prime movers is a prime mover of a generator that supplies power to a cement milk plant for mixing water and cement to prepare cement milk as the hardenable material; The apparatus further includes an exhaust gas mixing means for mixing exhaust gas discharged from a prime mover of the generator with the water, the mixture of the water and the cement, or the cement milk.

[0020] According to the above configuration (7), the exhaust gas discharged from the generator is mixed with water, a mixture of water and cement, or cement milk, so that the carbon dioxide in the exhaust gas dissolves and reacts with the water, the mixture of water and cement, or the cement milk and is absorbed. Here, the carbon dioxide dissolved and reacted with the water is dissolved and reacted with the cement by mixing the water and cement, and is absorbed by the cement milk. Therefore, the carbon dioxide in the exhaust gas mixed with the water is dissolved and reacted with the cement milk and absorbed, similar to when it is mixed with the cement milk, and the exhaust gas is supplied to the ground or pile hole in a state contained in the cement milk. Then, the cement milk that has absorbed the carbon dioxide is mixed with the excavated soil and hardened, and the carbon dioxide in the exhaust gas discharged from the generator at the foundation construction site is collected and stored in the ground. As a result, it is possible to suppress the carbon dioxide in the exhaust gas from being released into the atmosphere. Effect of the Invention

[0023] According to the present invention, there is provided a method for capturing and storing carbon dioxide contained in exhaust gas at a foundation construction site for civil engineering and building, a carbon dioxide capture and storage device, and a foundation constructed using said method. [Brief description of the drawings]

[0024] [Figure 1] FIG. 1 is a schematic diagram for explaining an example of a foundation construction site. [Diagram 2](a) shows the process of excavating the ground to form pile holes, (b) shows the process of supplying pile fixing fluid and stirring and mixing the excavated soil to form soil cement for the pile fixing part, (c) shows the process of supplying foot fixing fluid and stirring and mixing the excavated soil to form soil cement for the foot fixing part, (d) shows the process of pulling up the drill, (e) shows the process of sinking a prefabricated pile into the pile hole where soil cement is stored with a pile driver, (f) shows the process of sinking the prefabricated pile into the pile hole, and (g) shows the process of adding solidification material to the discharged soil, such as the mixture of excavated soil and excavated soil that overflowed from the pile hole, and the overflow of the pile fixing fluid containing excavated soil, and then stirring and mixing it to solidify it. [Diagram 3] 1 is a flowchart showing a schematic procedure of a method for capturing and storing carbon dioxide in exhaust gas at a foundation construction site according to one embodiment of the present invention. [Figure 4] FIG. 1 is a schematic diagram for explaining a carbon dioxide capture and storage method. [Diagram 5] FIG. 2 is a schematic diagram illustrating a method for capturing and storing carbon dioxide according to another embodiment of the present invention. [Figure 6] FIG. 2 is a schematic diagram illustrating a carbon dioxide capture and storage method according to yet another embodiment of the present invention. [Figure 7] FIG. 2 is a diagram illustrating a schematic configuration of an exhaust gas supply means according to an embodiment of the present invention. [Figure 8] FIG. 10 is a diagram illustrating a schematic configuration of an exhaust gas supply means according to another embodiment of the present invention. [Figure 9] FIG. 10 is a diagram illustrating a schematic configuration of an exhaust gas supply means according to another embodiment of the present invention. [Figure 10] FIG. 1 is a schematic diagram for explaining an example of a ground improvement construction site. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of components described as the embodiments or shown in the drawings are merely illustrative examples and are not intended to limit the scope of the present invention.

[0026] Fig. 1 is a schematic diagram for explaining an example of a foundation construction site. The foundation construction site in Fig. 1 is a pile foundation construction site, and is a construction site of a pre-boring method using prefabricated piles. At the foundation construction site, a pile driver (excavator) 1, a drilling fluid mixer (not shown), a cement milk plant 3, a generator 5, a water tank 7, a silo 8, etc. are installed.

[0027] The pile driver 1 includes a pile driver body 9, a mast 11, and a motor 13. The pile driver body 9 is self-propelled, and the mast 11 is attached to the pile driver body 9, and the motor 13 is attached to the mast 11 so that it can rise and fall. A swivel 15 and a drilling drill 17 are connected to the motor 13. The pile driver 1 is also equipped with a generator 19 for supplying power to the motor 13, and the drilling drill 17 can be rotated by the motor 13. Meanwhile, the drilling drill 17 has an internal flow path, and drilling fluid and cement milk (pile periphery fixing fluid and foot protection fluid) can be supplied to the internal flow path of the drilling drill 17 from a drilling fluid mixer and a cement milk plant 3 via the swivel 15. The drilling fluid and cement milk supplied to the internal flow path are discharged from the tip (lower end) of the drilling drill 17.

[0028] 2(a)-(g) are schematic diagrams showing the construction process of a pile foundation using a pile driver 1. FIG. 2(a) shows the state where the ground is excavated to form a pile hole 21, and FIG. 2(b) shows the state where the pile periphery fixing liquid is supplied and the pile periphery fixing liquid and the excavated soil are stirred and mixed to generate soil cement 23 that will be the pile periphery fixing portion. FIG. 2(c) shows the state where the foot fixing liquid and the excavated soil are stirred and mixed to generate soil cement 25 that will be the foot fixing portion while the foot fixing liquid is supplied, and FIG. 2(d) shows the state where the excavation drill is pulled up. FIG. 2(e) shows the state where the prefabricated pile 27 is sunk into the pile hole 21 in which the soil cements 23 and 25 are stored by the pile driver 1, and FIG. 2(f) shows the state where the prefabricated pile 27 is sunk into the pile hole 21. The construction of the pile foundation is completed when the soil cements 23 and 25 harden to form the pile periphery fixing portion and the foot fixing portion, respectively. Figure 2(g) shows how solidification material 28 is added to the discharged material, such as the mixture of excavation fluid and excavated soil overflowing from the pile hole, and the overflow of the pile surrounding fixation fluid containing the excavated soil, and the solidification is performed by stirring and mixing. The solidified material is treated as industrial waste.

[0029] Fig. 3 is a flow chart showing a schematic procedure of a method for capturing and storing carbon dioxide contained in exhaust gas at a foundation construction site (hereinafter, also simply referred to as a storage method) according to one embodiment of the present invention that can be applied to the above-mentioned pile foundation construction method. Fig. 4 is a schematic diagram for explaining the storage method. As shown in Figure 3, it has an exhaust gas supply process S1, and the pile foundation construction method includes an excavation process S3 (Figure 2(a)), a pile surrounding fixing liquid injection / stirring and mixing process S5 (Figure 2(b)), a root protection liquid injection / stirring and mixing process S7 (Figure 2(c)), a prefabricated pile installation process S9 (Figure 2(e)), and an exhaust solidification process S11 (Figure 2(g)).

[0030] At a foundation construction site, a hardening material such as drilling fluid or cement milk is supplied into the ground to be excavated or into a pile hole 21 formed in the ground to be excavated. Referring to Fig. 4, in an exhaust gas supplying step S1, exhaust gas is supplied into the ground or into the pile hole 21 in order to mix exhaust gas discharged from at least one of the prime movers 29, 31, 33 such as the pile driver 1 and the generators 5, 19 with the hardening material such as drilling fluid or cement milk.

[0031] According to the above-mentioned configuration, by supplying the exhaust gas discharged from the prime movers 29, 31, 33 into the ground or into the pile hole 21, the carbon dioxide in the exhaust gas dissolves in, reacts with, and is absorbed by the drilling fluid or hardening material such as cement milk. The drilling fluid that has absorbed the carbon dioxide is mixed with the excavated soil or permeates into the ground, and the hardening material such as cement milk that has absorbed the carbon dioxide hardens in the ground or in the pile hole 21. In this way, the carbon dioxide in the exhaust gas discharged from the prime movers 29, 31, 33 at the foundation construction site is collected and stored in the ground, and as a result, it is possible to suppress the release of the carbon dioxide in the exhaust gas into the atmosphere.

[0032] In addition, at the foundation construction site, the surplus soil, which is a mixture of the excavation fluid and the excavated soil, is discharged to the ground, and some of the hardening materials, such as the pile circumference fixing liquid containing the excavated soil, may flow out to the ground as overflow liquid. The surplus soil and overflow liquid are solidified using the solidification material 28 and disposed of as industrial waste. At this time, some of the exhaust gas supplied to the ground or the pile hole 21 is absorbed by the surplus soil or overflow liquid and discharged to the ground, and is disposed of as included in the industrial waste. If the discharged materials such as the surplus soil and overflow liquid discharged from the pile hole 21 are solidified and treated in this way, it is possible to suppress the carbon dioxide in the exhaust gas from being released into the atmosphere. On the other hand, when a hardening material whose main component is cement absorbs carbon dioxide and becomes carbonated, it becomes stronger than when it is not carbonated, improving the performance of the foundation.

[0033] On the other hand, when the cement milk reacts with carbon dioxide, the fluidity of the cement milk decreases in a relatively short time. Therefore, the cement milk can be prevented from escaping from the pile hole 21.

[0034] In addition, by supplying exhaust gas into the pile hole 21, the soil cement can be cured at high temperature and pressure using the soil cement's own weight, the heat of the exhaust gas, the heat of the reaction between the cement milk and carbon dioxide, and geothermal heat, and the soil cement can be cured at high temperature and pressure, allowing it to achieve the specified strength quickly. Furthermore, the greater the moisture content, the greater the amount of carbon dioxide absorbed. Therefore, if there is groundwater at the excavation depth of the pile foundation construction site, more carbon dioxide can be absorbed and stored.

[0035] The absorption of carbon dioxide by hardening materials such as cement milk is thought to be expressed by the following general reaction formula: xCaO ySiO 2 is tricalcium silicate or dicalcium silicate (belite, γC 2 S), and the consistency of the number of moles on the left and right sides of the formula is ignored. As shown in the formula, calcium silicate, water, and carbon dioxide react to produce calcium carbonate. xCaO ySiO 2 +H 2 O → vCaO wSiO 2 H 2 O+Ca(OH) 2 Ca(OH) 2 +CO 2 →CaCO 3 +H 2 O The absorption of carbon dioxide by drilling fluid is represented by the following general reaction formula: As shown in the formula, carbon dioxide reacts with water to produce carbonic acid. CO 2 +H 2 O→H 2 CO 3

[0036] In some embodiments, as shown in FIG. 4, one of the at least one prime movers is a prime mover 29 of the pile driver 1 or a prime mover (diesel engine) 31 of a generator 19 mounted on the pile driver 1, and in the exhaust gas supply step S1, supplies exhaust gas to a supply pipe 35 for supplying drilling fluid or cement milk as a hardening material into the ground or into the pile hole 21.

[0037] According to the above configuration, exhaust gas discharged from the prime mover 29 of the pile driver 1 or the prime mover 31 of the generator 19 mounted on the pile driver 1 can be supplied to the drilling fluid or cement milk supply pipe 35, thereby simplifying the configuration of the path for supplying the exhaust gas. In addition, the drilling fluid or cement milk can be efficiently mixed with the exhaust gas by supplying the exhaust gas to the drilling fluid or cement milk supply pipe 35. As a result, the carbon dioxide in the exhaust gas can be efficiently dissolved and reacted with the drilling fluid or cement milk, and the carbon dioxide in the exhaust gas can be prevented from being released into the atmosphere.

[0038] Fig. 5 is a schematic diagram for explaining a storage method according to another embodiment of the present invention, and Fig. 6 is a schematic diagram for explaining a storage method according to yet another embodiment of the present invention. In some embodiments, the exhaust gas supply step S1 includes an exhaust gas mixing step. In the exhaust gas mixing step, as shown in Fig. 5 and Fig. 6, one of the at least one prime mover is a prime mover 33 of a generator 5 that supplies power to a cement milk plant 3 for mixing water and cement to prepare cement milk as a hardening material, and the exhaust gas discharged from the prime mover 33 of the generator 5 is mixed with water, a mixture of water and cement, or cement milk. Note that the mixture of water and cement refers to a mixture in the process of being mixed, and a mixture that is sufficiently mixed is referred to as cement milk.

[0039] According to the above configuration, the exhaust gas discharged from the prime mover 33 of the generator 5 that supplies power to the cement milk plant 3 is mixed with water, a mixture of water and cement, or cement milk, so that the carbon dioxide in the exhaust gas dissolves and reacts with the water, the mixture of water and cement, or the cement milk and is absorbed. Here, the carbon dioxide dissolved and reacted with the water is dissolved and reacted with the cement by mixing the water and cement, and is absorbed by the cement milk. Therefore, the carbon dioxide in the exhaust gas mixed with the water is dissolved and reacted with the cement milk and is absorbed in the same manner as when it is mixed with the cement milk, and the exhaust gas is supplied to the ground or the pile hole 21 in a state contained in the cement milk. Then, the cement milk that has absorbed the carbon dioxide is mixed with the excavated soil and hardened, and the carbon dioxide in the exhaust gas discharged from the generator 5 at the foundation construction site is collected and stored in the ground. As a result, it is possible to suppress the carbon dioxide in the exhaust gas from being released into the atmosphere.

[0040] In some embodiments, the storage method includes a stirring and mixing step of stirring and mixing the excavated soil of the ground and the cement milk by the pile driver, with one of the at least one prime mover being the prime mover 29 of the pile driver 1 or the prime mover 31 of the generator 19 mounted on the pile driver 1. In this embodiment, the stirring and mixing step corresponds to the pile circumference fixing liquid injection / stirring and mixing step S5 and the foot protection liquid injection / stirring and mixing step S7, respectively.

[0041] According to the above configuration, by stirring and mixing the excavated soil and cement milk, exhaust gas is dispersed and the strength of the soil cement formed by the excavated soil and cement milk, i.e., the pile perimeter fixing portion and the root reinforcement portion, can be suppressed from decreasing.

[0042] Hereinafter, an apparatus for capturing carbon dioxide contained in exhaust gas at a foundation construction site (hereinafter, simply referred to as a capture apparatus) according to one embodiment of the present invention that is suitable for the above-mentioned storage method will be described. As shown in Figures 4 to 6, the recovery device is equipped with an exhaust gas supplying means for supplying exhaust gas into the ground or into the pile hole 21 formed in the ground to be excavated at a foundation construction site, in order to mix the drilling fluid or hardening material supplied into the ground to be excavated or into the pile hole 21 formed in the ground to be excavated with exhaust gas discharged from at least one of the prime movers 29, 31, and 33.

[0043] According to the above configuration, the exhaust gas discharged from the prime mover is supplied into the ground or into the pile hole by the exhaust gas supply means, whereby the carbon dioxide in the exhaust gas is dissolved and reacted with the drilling fluid or the hardening material and absorbed. The drilling fluid that has absorbed the carbon dioxide is mixed with the excavated soil or permeates into the ground, and the hardening material that has absorbed the carbon dioxide hardens in the ground or in the pile hole 21. In this way, the carbon dioxide in the exhaust gas discharged from the prime mover at the foundation construction site is collected and stored in the ground, and as a result, it is possible to prevent the carbon dioxide in the exhaust gas from being released into the atmosphere.

[0044] In some embodiments, one of the at least one prime mover is a prime mover 29 of the pile driver 1 or a prime mover 31 of a generator 19 mounted on the pile driver 1, and the exhaust gas supply means includes a pump 37, 39 for supplying exhaust gas to a supply pipe 35 for supplying drilling fluid or cement milk as a hardenable material into the ground or into the pile hole 21.

[0045] According to the above configuration, by supplying exhaust gas to the supply pipe 35 for the drilling fluid or cement milk by the pumps 37, 39, the configuration of the path for supplying the exhaust gas can be simplified. In addition, the drilling fluid or cement milk can be efficiently mixed with the exhaust gas by supplying the exhaust gas to the drilling fluid or cement milk supply pipe 35. As a result, the carbon dioxide in the exhaust gas can be efficiently dissolved and reacted with the drilling fluid or cement milk, and the carbon dioxide in the exhaust gas can be prevented from being released into the atmosphere.

[0046] In some embodiments, one of the at least one prime mover is a prime mover 33 of a generator 5 that supplies power to a cement milk plant 3 for mixing water and cement to prepare cement milk as a hardenable material, and the exhaust gas supplying means includes an exhaust gas mixing means that mixes exhaust gas discharged from the prime mover 33 of the generator 5 with water, a mixture of water and cement, or cement milk. The exhaust gas mixing means is, for example, a pump 41 that supplies exhaust gas to a water supply pipe or a water tank 7 to the cement milk plant 3, as shown in Figures 5 and 6.

[0047] According to the above configuration, the exhaust gas discharged from the generator 5 is mixed with water, a mixture of water and cement, or cement milk, so that the carbon dioxide in the exhaust gas dissolves and reacts with the water, the mixture of water and cement, or the cement milk and is absorbed. Here, the carbon dioxide dissolved and reacted with the water is dissolved and reacted with the cement by mixing the water and cement, and is absorbed by the cement milk. Therefore, the carbon dioxide in the exhaust gas mixed with water is dissolved and reacted with the cement milk and is absorbed, similar to the case where the exhaust gas is mixed with the cement milk. Then, the cement milk that has absorbed the carbon dioxide is mixed with the excavated soil and hardened, and the carbon dioxide in the exhaust gas discharged from the generator 5 at the foundation construction site is collected and stored in the ground. As a result, it is possible to suppress the carbon dioxide in the exhaust gas from being released into the atmosphere.

[0048] In some embodiments, as shown in Fig. 5, one of the at least one prime mover is a prime mover 33 of a generator 5 that supplies power to a drilling fluid mixer 43 for mixing water and bendonite to prepare drilling fluid, and the exhaust gas supplying means includes an exhaust gas mixing means for mixing exhaust gas discharged from the prime mover 33 of the generator 5 with water, a mixture of water and bendonite, or drilling fluid. The exhaust gas mixing means is a water supply pipe to the drilling fluid mixer 43 or a pump 45 for supplying exhaust gas to the water tank 7. Note that the mixture of water and bendonite refers to a mixture in the process of being mixed, and a mixture that is sufficiently mixed is referred to as drilling fluid.

[0049] According to the above configuration, the exhaust gas discharged from the generator 5 is mixed with water, a mixture of water and bendonite, or drilling fluid, and the carbon dioxide in the exhaust gas dissolves in and reacts with the water, the mixture of water and bendonite, or the drilling fluid, and is absorbed. The drilling fluid that has absorbed the carbon dioxide is then mixed with the excavated soil or permeates the ground. This allows the carbon dioxide in the exhaust gas discharged from the prime mover 33 at the foundation construction site to be collected and stored in the ground, and as a result, it is possible to prevent the carbon dioxide in the exhaust gas from being released into the atmosphere.

[0050] FIG. 7 is a diagram showing a schematic configuration of an exhaust gas supply means according to one embodiment of the present invention. 7, in some embodiments, the exhaust gas supplying means has an ultrasonic nozzle 47 having an ultrasonic transducer, and supplies the exhaust gas to the drilling fluid or soil cement supply pipe 35 via the ultrasonic nozzle 47. By using the ultrasonic nozzle 47, the exhaust gas can be supplied in the form of microbubbles, and thus the drilling fluid or soil cement and the exhaust gas can be efficiently mixed and reacted with each other.

[0051] FIG. 8 is a diagram showing a schematic configuration of an exhaust gas supply means according to one embodiment of the present invention. 8, in some embodiments, the exhaust gas supplying means has an ultrasonic nozzle 49 having an ultrasonic vibrator, and supplies the exhaust gas to a tank 51 storing water via the ultrasonic nozzle 49. By using the ultrasonic nozzle 49, the exhaust gas can be supplied in the form of microbubbles, and thus the water and the exhaust gas can be efficiently mixed and reacted with each other.

[0052] FIG. 9 is a diagram illustrating a schematic configuration of an exhaust gas supplying means according to still another embodiment of the present invention. In some embodiments, as shown in Fig. 9, the exhaust gas supplying means has a high-pressure tank 53 and a spray 55. In this case, water is sprayed via the spray 55 into the high-pressure tank 53, which is filled with exhaust gas and has a pressure higher than normal, to mix the water and the exhaust gas. By spraying water under a pressure higher than normal, the water and the exhaust gas can be efficiently mixed and reacted with each other.

[0053] Thus, in the foundation according to one embodiment of the present invention constructed using the above-mentioned storage method or recovery device, the soil cement formed from the excavated soil and cement milk absorbs carbon dioxide. The soil cement carbonated by absorbing carbon dioxide in this way has a higher strength than conventional soil cement that is not carbonated, improving the performance of the foundation.

[0054] Finally, the present invention is not limited to the above-described embodiments, but also includes modifications to the above-described embodiments and appropriate combinations of these modifications. For example, in the above-described embodiment, the exhaust gas is supplied into the pile hole 21 through the internal flow passage of the drill 17. However, a supply passage for supplying the exhaust gas into the ground or the pile hole 21 may be provided separately from the above. The type of precast pile 27 is not particularly limited, and concrete piles and steel pipe piles such as SC piles (concrete piles with outer steel shell), PC piles (prestressed concrete piles), PHC piles (prestressed high-strength concrete piles), and PRC piles (prestressed reinforced concrete piles) can be used. In addition, the piles to which the present invention is applied are not limited to precast piles, but may be cast-in-place piles. In the case of cast-in-place piles, the hardening material is concrete produced by mixing water, cement, and aggregate. Furthermore, the foundation to which the present invention is applied is not limited to a pile foundation, but may be a direct foundation or ground improvement (columnar improvement). In the case of ground improvement, as shown in Fig. 10, instead of drilling pile holes, cement milk is injected and mixed while drilling the ground with a drilling drill 57, forming a columnar body 59 in the ground. A prefabricated pile may be further sunk into the columnar body 59. The hardening material is not limited to cement milk or concrete, but may be mortar, so long as it contains calcium silicate. [Explanation of symbols]

[0055] 1. Pile driver (excavator) 3. Cement Milk Plant 5. Generator 7. Aquarium 9 Pile driver body 11 Mast 13 Motor 15 Swivel 17 Drilling 19. Generator 21 Pilehole 23 Soil cement (pile perimeter fixing part) 25 Soil cement (foot protection section) 27 Prefabricated piles 28 Solidification material 29, 31, 33 Prime mover 35 Supply pipe 37, 39, 41, 45 Pump 43 Drilling Fluid Mixer 47,49 Ultrasonic nozzle 51 Tank 53 High Pressure Tank 55 Spray 57 Drill 59 Columnar body

Claims

1. At a foundation construction site, an exhaust gas supplying step is provided for supplying exhaust gas discharged from at least one prime mover into the ground to be excavated or into a pile hole formed in the ground to be excavated, in order to mix the exhaust gas with drilling fluid or hardening material supplied thereto; In the exhaust gas supplying step, the exhaust gas is supplied to a supply pipe for supplying the drilling fluid or the cement milk as the hardening material into the ground or into the pile hole. A method for capturing and storing carbon dioxide contained in exhaust gas at a foundation construction site.

2. One of the at least one prime movers is a prime mover of a pile driver or a prime mover of a generator mounted on the pile driver.

2. A method for capturing and storing carbon dioxide contained in exhaust gas at a foundation construction site according to claim 1.

3. One of the at least one prime movers is a prime mover of a generator that supplies power to a cement milk plant for mixing water and cement to prepare cement milk as the hardenable material; The exhaust gas supplying step includes an exhaust gas mixing step of mixing the exhaust gas discharged from the prime mover of the generator with the water, a mixture of the water and the cement, or the cement milk.

3. A method for capturing and storing carbon dioxide contained in exhaust gas at a foundation construction site according to claim 1 or 2.

4. one of the at least one prime mover is a prime mover of a pile driver or a prime mover of a generator mounted on the pile driver; The method includes a mixing and stirring process for mixing the excavated soil and the cement milk by the pile driver. A method for capturing and storing carbon dioxide contained in exhaust gas at a foundation construction site according to any one of claims 1 to 3.

5. At a foundation construction site, in order to mix the exhaust gas discharged from at least one prime mover with the drilling fluid or hardening material supplied into the ground to be excavated or into a pile hole formed in the ground to be excavated, an exhaust gas supplying means is provided for supplying the exhaust gas into the ground or into the pile hole; The exhaust gas supplying means has a pump for supplying the exhaust gas to a supply pipe for supplying the drilling fluid or the cement milk as the hardenable material into the ground or into the pile hole. A carbon dioxide capture and storage device for exhaust gas at a foundation construction site.

6. One of the at least one prime movers is a prime mover of a pile driver or a prime mover of a generator mounted on the pile driver.

6. The carbon dioxide capture and storage device according to claim 5, which is contained in exhaust gas at a foundation construction site.

7. One of the at least one prime movers is a prime mover of a generator that supplies power to a cement milk plant for mixing water and cement to prepare cement milk as the hardenable material; The exhaust gas supplying means includes an exhaust gas mixing means for mixing the exhaust gas discharged from the prime mover of the generator with the water, the mixture of the water and the cement, or the cement milk.

7. The carbon dioxide capture and storage device according to claim 5 or 6, which is contained in exhaust gas at a foundation construction site.

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