Dual-Injection Smart Auger Apparatus for Constructing a Soil Cement Wall Cutoff Wall of an Underground Water Storage Dam, and Control Method Thereof

Abstract

The present invention relates to a dual-injection type smart auger device for constructing a SCW cutoff wall of a groundwater storage dam and a control method thereof. The auger device according to the present invention is provided with an inner injection passage for supplying material for forming a core layer and an outer injection passage for supplying material for forming a shell layer, and is provided with an inner injection nozzle and an outer injection nozzle at the ends of the inner injection passage and the outer injection passage, respectively. In addition, the auger device includes a sensor module for detecting torque, rotational speed, injection pressure, injection amount, and position, and a control module for controlling an inner injection pressure P1, an outer injection pressure P2, a pressure ratio P2 / P1, an injection amount ratio, rotational speed, and a differential injection condition Δt based on the detection data of the sensor module. The above control module can form a core-shell structured SCW cutoff wall including a core layer in the center and a shell layer in the outer part by performing at least one of controlling the outer injection pressure P2 to be greater than or equal to the inner injection pressure P1 and controlling the outer injection to be performed after a set time difference Δt following the inner injection. In addition, the present invention can improve the strength, water impermeability, and construction quality of a groundwater storage dam cutoff wall by storing and verifying quality data detected during construction.

Description

Technology Field

[0001] The present invention relates to a construction technique for a cutoff wall of a groundwater storage dam. More specifically, it relates to a technique for forming an SCW cutoff wall by excavating the ground using an auger and mixing a cementitious injection material with soil. In particular, the present invention relates to a dual-injection type smart auger device and a control method thereof, which can form a core-shell structured SCW cutoff wall including a core layer in the center and a shell layer on the outer part by independently forming an inner injection passage and an outer injection passage inside the auger device and dual-injecting materials of different compositions or different injection conditions through the inner injection nozzle and the outer injection nozzle.

[0002] In addition, the present invention relates to a smart construction control technology capable of securing homogeneous cutoff wall quality in response to changes in ground conditions by detecting torque, rotational speed, injection pressure, injection amount, and position data through a sensor module, and by a control module comparing the detected values ​​with target conditions to control an auger device, a rotary drive unit, a core pump, a shell pump, a compressor, a flow control valve, and a pressure control valve in real time. Background Technology

[0003] A groundwater storage dam is a structure designed to store water resources underground by blocking groundwater flow or suppressing groundwater outflow. Such groundwater storage dams can be installed in river areas, alluvial deposits, permeable ground, sections with active groundwater flow, or underground areas where securing water resources is required.

[0004] To ensure the performance of a groundwater storage dam, it is important to form a continuous cutoff wall underground. The SCW method can be applied to form such a cutoff wall. The SCW method is a method of forming a soil-cement mixed wall underground by excavating the ground using an auger while injecting cement milk or cement slurry, and mixing the injected material with the original ground soil.

[0005] Conventional SCW methods were generally performed by injecting a grout of the same composition at a constant pressure through a single injection channel and a single nozzle. While this single injection method has the advantage of a simple structure, it presents a problem in that the degree of mixing between the grout and soil can become uneven depending on soil particle size, moisture content, clay content, the presence of a gravel layer, excavation resistance, changes in auger rotation speed, and fluctuations in injection pressure.

[0006] In particular, SCW cutoff walls applied to groundwater storage dams must maintain watertightness while in contact with groundwater for a long period, so it is important to ensure homogeneous strength and a low permeability coefficient throughout the entire wall. However, conventional single injection structures have limitations in that it is difficult to design the functions of the center and outer parts of the wall separately, and it is difficult to simultaneously optimize strength and watertightness because materials of the same composition are applied to the entire wall.

[0007] Furthermore, conventional construction methods often rely on the operator's experience to control injection pressure, injection volume, rotational speed, and penetration speed. Consequently, immediate control corrections are difficult in sections where ground conditions change rapidly, and there are limitations in securing data to objectively verify the quality of the wall after construction.

[0008] Therefore, there is a need for an apparatus and method capable of forming an SCW cutoff wall with improved strength and water impermeability of a core-shell structure by simultaneously performing excavation and injection while controlling the material properties of the center and outer parts differently, and controlling the inner injection pressure, outer injection pressure, injection amount, rotational speed, and injection timing in real time. The problem to be solved

[0009] The objective of the present invention is to provide a dual-injection type smart auger device and a control method thereof that can form a core-shell structured water barrier with functionally separated strength and water barrier by forming a core layer having relatively high strength and shape retention in the center and a shell layer having relatively low permeability and high water barrier in the outer part when constructing a SCW water barrier of a groundwater storage dam.

[0010] Another objective of the present invention is to provide an auger device capable of controlling a core layer forming material and a shell layer forming material at different pressures, flow rates, viscosities, and injection timings by forming an inner injection passage and an outer injection passage inside the auger device and independently arranging an inner injection nozzle and an outer injection nozzle at the ends of the inner injection passage and the outer injection passage, respectively.

[0011] Another objective of the present invention is to provide a smart control method capable of maintaining homogeneous cutoff wall quality even with changes in ground conditions by detecting torque, rotational speed, injection pressure, injection amount, and position data in real time, and automatically correcting the inner-outer injection pressure ratio, injection amount ratio, rotational speed, and differential injection conditions by comparing the detected values ​​with target conditions.

[0012] Another objective of the present invention is to improve the recordability, verifiability, and manageability of construction quality by storing quality data generated during construction in a data storage unit and displaying real-time construction status and quality judgment results through a user monitoring interface. means of solving the problem

[0013] To solve the above problem, the dual injection type smart auger device for constructing a cutoff wall of a groundwater storage dam SCW according to the present invention may include an auger device rotatably installed, a rotary drive unit for rotating the auger device, a screw blade formed on the outer surface of the auger device, an inner injection passage formed inside the auger device and supplying material for forming a core layer, an outer injection passage formed outside the inner injection passage inside the auger device and supplying material for forming a shell layer, an inner injection nozzle connected to the end of the inner injection passage, an outer injection nozzle connected to the end of the outer injection passage, a sensor module for detecting the construction state of the auger device, and a control module for independently controlling the injection conditions of the inner injection nozzle and the outer injection nozzle based on data detected by the sensor module.

[0014] The inner injection passage may be positioned at the center of the auger device, and the outer injection passage may be positioned as an annular channel or a plurality of independent channels surrounding the outer side of the inner injection passage. Accordingly, the core layer forming material and the shell layer forming material may be supplied through channels separated from each other within the auger device.

[0015] The inner injection nozzle is positioned at the center of the tip of the auger device or at an adjacent location and can inject the core layer forming material in an axial, downward, or radial auxiliary direction. Multiple outer injection nozzles may be arranged along the circumferential direction on the outer side of the inner injection nozzle, and the multiple outer injection nozzles may be arranged to have at least one of different injection angles, different installation heights, or different injection directions.

[0016] According to one embodiment, an air hammer that assists in ground penetration may be installed at the tip of the auger device, and an air hole that sprays compressed air may be formed at the air hammer or an adjacent part thereof. In this case, the control module may control at least one of the supply pressure, supply amount, and operating time of a compressor that supplies compressed air to the air hole.

[0017] The sensor module may include at least one of a torque sensor for detecting rotational resistance of the auger device, a rotational speed sensor for detecting rotational speed of the auger device, an injection pressure sensor for detecting injection pressure of the inner injection passage and the outer injection passage, an injection amount sensor for detecting the injection amount of material for forming the core layer and material for forming the shell layer, and a position sensor for detecting the penetration depth or construction position of the auger device.

[0018] The control module can compare at least one of the torque, rotational speed, injection pressure, injection amount, and position data detected by the sensor module with a target condition, and adjust at least one of the rotational speed of the auger device, inner injection pressure, outer injection pressure, inner injection amount, outer injection amount, injection amount ratio, and differential injection conditions according to the comparison result. In addition, the control module can control at least one of a rotary drive unit that rotates the auger device, a core pump that supplies material for forming a core layer to the inner injection passage, a shell pump that supplies material for forming a shell layer to the outer injection passage, a flow control valve, and a pressure control valve.

[0019] The control module can control at least one of the inner injection pressure P1 of the inner injection nozzle, the outer injection pressure P2 of the outer injection nozzle, the pressure ratio P2 / P1 of the outer injection pressure P2 and the inner injection pressure P1, the injection amount ratio of the inner injection amount and the outer injection amount, and the difference in injection timing between the inner injection nozzle and the outer injection nozzle.

[0020] The control module can control the external injection pressure P2 of the external injection nozzle to be greater than or equal to the internal injection pressure P1 of the internal injection nozzle, or to maintain the pressure ratio P2 / P1 of the external injection pressure P2 and the internal injection pressure P1 within a set target range. Accordingly, the material for forming the shell layer can be controlled to be distributed on the outside of the material for forming the core layer.

[0021] In addition, the control module may control the injection of the core layer forming material to be injected first, followed by the injection of the shell layer forming material, by applying a time difference Δt between the injection start time of the inner injection nozzle and the injection start time of the outer injection nozzle. The time difference Δt may be variably set according to at least one of ground conditions, injection material viscosity, injection pressure, injection amount, auger rotation speed, or penetration depth.

[0022] The core layer forming material may be a material in which at least one of strength development, shape retention, solid content, and viscosity is adjusted differently from the shell layer forming material. The shell layer forming material may be a material in which at least one of water impermeability, low permeability, fluidity, and ground contact is adjusted differently from the core layer forming material. The core layer forming material and the shell layer forming material may include at least one of a cementitious binder, a slag-based binder, a fly ash-based material, a gypsum-based reactive agent, a bentonite-based material, an expansive agent, a viscosity modifier, a strength development promoter, and a water impermeability enhancer.

[0023] The dual-spray smart auger device according to the present invention may further include a data storage unit connected to the control module to store construction quality data. The data storage unit may store depth-specific data, location-specific data, and time-specific data in correspondence with at least one of the inner injection pressure P1, outer injection pressure P2, pressure ratio P2 / P1, injection amount ratio, rotational speed, and differential injection condition Δt. Additionally, the control module may use the data stored in the data storage unit to perform at least one of quality verification of the SCW cutoff wall, construction history management, or setting construction conditions for subsequent sections.

[0024] In addition, the dual injection type smart auger device according to the present invention may further include a user monitoring interface connected to the control module to display at least one of a real-time construction status, an inner injection pressure P1, an outer injection pressure P2, a pressure ratio P2 / P1, an injection amount ratio, a rotational speed, a differential injection condition Δt, and a quality judgment result.

[0025] Additionally, the sensor module may include a position sensor, and the control module may calculate at least one of the center gap between a preceding construction body and a succeeding construction body, the overlap width, or the overlap rate based on construction position data or penetration position data detected by the position sensor. The control module may correct the construction position or penetration position of the auger device so that the preceding construction body and the succeeding construction body overlap each other at a set overlap portion.

[0026] In addition, a control method for a dual-injection type smart auger device for constructing a SCW cutoff wall for a groundwater storage dam according to the present invention may include the steps of: rotating the auger device to penetrate into the ground; supplying a material for forming a core layer through an inner injection passage and injecting the material for forming a core layer through an inner injection nozzle; supplying a material for forming a shell layer through an outer injection passage and injecting the material for forming a shell layer through an outer injection nozzle; detecting at least one of torque, rotational speed, injection pressure, injection amount, and position through a sensor module; comparing the detected value of the sensor module with a target condition by a control module; and adjusting at least one of an inner injection pressure P1, an outer injection pressure P2, a pressure ratio P2 / P1, an inner injection amount, an outer injection amount, an injection amount ratio, a rotational speed, and a time-difference injection condition Δt according to the comparison result to form a core-shell structured SCW cutoff wall including a core layer in the center and a shell layer in the outer part.

[0027] In the step of forming the SCW cutoff wall of the core-shell structure above, at least one of controlling the outer injection pressure P2 to be greater than or equal to the inner injection pressure P1 and introducing a time difference Δt between the injection start time of the inner injection nozzle and the injection start time of the outer injection nozzle may be performed. Effects of the invention

[0028] According to the present invention, different injection materials can be supplied independently through the inner injection passage and the outer injection passage, thereby forming a double-layer water barrier including a core layer in the center and a shell layer in the outer part.

[0029] In addition, since a material advantageous for securing strength can be applied to the core layer and a material advantageous for securing water resistance can be applied to the shell layer, strength and water resistance can be simultaneously improved compared to conventional single-material SCW walls.

[0030] In addition, since rotational speed, torque, injection pressure, injection amount, and position can be detected and controlled in real time through the sensor module and control module, variations in construction quality due to changes in ground conditions can be reduced and a homogeneous cutoff wall can be formed.

[0031] In addition, by controlling the pressure ratio so that the outer injection pressure is maintained above the inner injection pressure, or by performing differential injection control that delays the outer injection after the inner injection, disorderly mixing of the boundary between the core layer and the shell layer can be suppressed and a stable core-shell structure can be formed.

[0032] Furthermore, since quality data by depth, location, and time can be stored in the data storage unit, the quality of the cutoff wall after construction can be verified based on data. In addition, real-time construction status, injection pressure, injection volume, rotation speed, and quality assessment results can be checked through the user monitoring interface.

[0033] In addition, according to one embodiment, a low-cement or high-slag material can be applied as a material for forming a shell layer, so that the amount of cement used can be reduced while securing the required water impermeability and strength. Brief explanation of the drawing

[0034] FIG. 1 is a cross-sectional view schematically showing the overall configuration of a dual-spray type smart auger device according to the present invention. Figure 2 is a cross-sectional view showing an enlarged view of the lower excavation unit and nozzle section of Figure 1. FIG. 3 is a cross-sectional view showing the concentric arrangement structure of the inner injection passage and the outer injection passage inside the auger device. FIG. 4 is a diagram showing the operating state of an auger device according to the present invention forming a core layer and a shell layer while rotating and penetrating. Figure 5 is a block diagram showing the control relationships of the sensor module, the control module, and each driving part. FIG. 6 is a flowchart showing the sequence of the SCW cutoff wall construction control method according to the present invention. Figure 7a is a timing diagram showing the differential injection control concept of inner core injection and outer shell injection. FIG. 7b is a conceptual diagram showing the state in which a core layer is formed by core injection through an inner injection passage. FIG. 7c is a conceptual diagram showing the state in which a shell layer is formed on the outer side of the core layer by shell injection through an outer injection channel. FIG. 7d is a conceptual diagram showing the pressure ratio control of the inner injection pressure P1 and the outer injection pressure P2 and the core-shell cross-sectional structure. FIG. 8 is a conceptual plan view showing a state in which multiple core-shell construction bodies overlap each other to form a continuous SCW cutoff wall. Figure 9 is a drawing showing an example of a modified arrangement of an inner injection nozzle and an outer injection nozzle. Figure 10 is a conceptual diagram showing the data flow structure for storing and verifying construction quality data. Specific details for implementing the invention

[0035] Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings. However, the following embodiments are examples to aid in understanding the present invention and are not limited to the scope of the present invention.

[0036] As illustrated in FIG. 1, the dual-spray smart auger device according to the present invention includes an auger device (100) for penetrating into the ground (200) to form an SCW cutoff wall (300). The auger device (100) may be rotatably installed by a rotary drive unit (230), and the rotary drive unit (230) may adjust the rotational speed, rotational torque, or penetration conditions of the auger device (100) according to a control signal transmitted from a control module (170).

[0037] Screw blades (120) are formed on the outer surface of the auger device (100). The screw blades (120) perform the function of excavating the ground (200) as the auger device (100) rotates, and mixing the material injected through the inner injection nozzle (131) and the outer injection nozzle (141) with the original ground soil. The screw blades (120) may be formed in a spiral shape, and the pitch, outer diameter, blade thickness, and angle of inclination may be adjusted according to ground conditions, excavation diameter, target cutoff wall thickness, and viscosity of the injection material.

[0038] An excavation unit (110) may be formed at the lower end of the auger device (100). The excavation unit (110) provides a space where the injection material can be mixed with soil while cutting or crushing the ground at the tip of the auger device (100). The excavation unit (110) may be configured to support an inner injection nozzle (131), an outer injection nozzle (141), an air hammer (150), and an air ball (151).

[0039] An inner injection passage (130) and an outer injection passage (140) are formed inside the auger device (100). The inner injection passage (130) is a passage for supplying a core layer forming material to form a core layer (210). The outer injection passage (140) is a passage for supplying a shell layer forming material to form a shell layer (220).

[0040] As illustrated in FIG. 3, the inner injection passage (130) may be positioned in the center of the auger device (100). The outer injection passage (140) may be arranged as an annular channel or a plurality of independent channels surrounding the outer side of the inner injection passage (130). Through this concentric double injection passage structure, the material for forming the core layer can be supplied to the center, and the material for forming the shell layer can be supplied separately to the outer side.

[0041] As illustrated in FIGS. 1 and 2, an inner injection nozzle (131) is provided at the end of the inner injection passage (130). The inner injection nozzle (131) is positioned at the tip center of the auger device (100) or at an adjacent location to inject a core layer forming material toward the center of the ground. The inner injection nozzle (131) may be configured as a downward injection type, an axial injection type, or a radiation-assisted injection type.

[0042] An outer injection nozzle (141) is provided at the end of the outer injection passage (140). The outer injection nozzle (141) is positioned outside the inner injection nozzle (131) and sprays a material for forming a shell layer in a radial or diagonal direction. Multiple outer injection nozzles (141) may be arranged along the circumferential direction of the auger device (100), and the spraying direction may be set so that the shell layer (220) uniformly surrounds the outside of the core layer (210).

[0043] As illustrated in FIG. 2, an air hammer (150) may be installed at the tip of the auger device (100). The air hammer (150) performs the function of improving excavation efficiency by applying impact force or vibration during ground penetration. Additionally, an air hole (151) may be formed on the air hammer (150) or in an adjacent area. The air hole (151) can spray compressed air to improve material fluidity around the excavation area, suppress clogging around the nozzle, or assist in the diffusion of the injection material within the ground.

[0044] As illustrated in FIG. 1, a core material supply line (180), a shell material supply line (190), and a compressed air supply line (191) may be connected to the auger device (100). The core material supply line (180) is connected to an inner injection passage (130). The shell material supply line (190) is connected to an outer injection passage (140). The compressed air supply line (191) is connected to an air hammer (150) or an air ball (151).

[0045] In the present invention, the core layer (210) is a layer formed in the center of the SCW cutoff wall (300). The core layer (210) may be configured to have relatively high strength and shape retention. The material for forming the core layer may include cement milk, high-concentration cement slurry, cement-slag-based binder, gypsum-based reactant, expansive agent, viscosity modifier, or a combination thereof. The material for forming the core layer may have a relatively high solid content, high viscosity, or high initial strength development compared to the material for forming the shell layer.

[0046] The shell layer (220) is a layer that surrounds the outer side of the core layer (210). The shell layer (220) may be formed on the outer part that is in direct contact with groundwater or in contact with the ground. The material for forming the shell layer may be a slag-based, fly ash-based, gypsum-based, bentonite-based, or low-cement-based slurry that is advantageous for securing low permeability. The material for forming the shell layer may have a relatively low cement content, high fluidity, or low permeability coefficient compared to the material for forming the core layer.

[0047] In the present invention, the core-shell structure is not limited to a structure in which the core layer (210) and the shell layer (220) are completely separated by a clear physical boundary. The core-shell structure may include a structure in which the material distribution ratio or physical property distribution of the center and the outer part is differentiated by the difference in composition, injection pressure, injection amount, injection direction, and injection timing of the materials supplied separately through the inner injection passage (130) and the outer injection passage (140).

[0048] As illustrated in FIG. 4, the auger device (100) is inserted into the ground (200) while rotating. At this time, the inner injection nozzle (131) sprays material for forming the core layer, and the outer injection nozzle (141) sprays material for forming the shell layer. The screw blade (120) mixes the injection material and the soil, and the control module (170) can control the rotation speed and injection conditions so that the core layer (210) and the shell layer (220) are not excessively mixed. The control module (170) can control the rotation speed of the auger device (100), the inner injection amount, the outer injection amount, the inner injection pressure P1, the outer injection pressure P2, the pressure ratio P2 / P1, and the differential injection condition Δt by adjusting at least one of these so that the material for forming the core layer and the material for forming the shell layer are mixed with the soil, while maintaining the difference in material distribution between the center and the outer part, and maintaining the mixing range of the two materials within a set range. Accordingly, a cylindrical core-shell construction body is formed within the ground (200), comprising a core layer (210) in the center and a shell layer (220) in the outer part.

[0049] As illustrated in FIG. 5, the smart control system according to the present invention may include a sensor module (160), a control module (170), an auger device (100), a rotary drive unit (230), a core pump (241), a shell pump (251), a compressor (260), a flow control valve (270), a pressure control valve (271), a data storage unit (280), and a user monitoring interface (290).

[0050] The sensor module (160) may include a torque sensor (161), a rotational speed sensor (162), an injection pressure sensor (163), an injection amount sensor (164), and a position sensor (165). The torque sensor (161) detects rotational resistance or ground resistance of the auger device (100). The rotational speed sensor (162) detects the rotational speed of the auger device (100). The injection pressure sensor (163) detects the injection pressure of the inner injection passage (130) and the outer injection passage (140). The injection amount sensor (164) detects the supply amount of material for forming the core layer and material for forming the shell layer. The position sensor (165) can detect the penetration depth, construction position, or movement position of the auger device (100).

[0051] The control module (170) analyzes data received from the sensor module (160) and compares it with target conditions. The control module (170) controls the auger device (100), rotary drive unit (230), core pump (241), shell pump (251), compressor (260), flow control valve (270), and pressure control valve (271) according to the comparison result. For example, if the torque increases above a reference value, the control module (170) may decrease the rotational speed or increase the injection amount. Additionally, if the external injection pressure becomes lower than the target pressure ratio, the control module (170) may increase the discharge pressure of the shell pump (251) or adjust the pressure control valve (271).

[0052] The control module (170) can compare the inner injection pressure P1 and the outer injection pressure P2 to control the outer injection pressure P2 to be greater than or equal to the inner injection pressure P1. Accordingly, the material for forming the outer shell layer stably wraps around the outer edge of the material for forming the core layer, and the core layer (210) can be suppressed from spreading excessively outward.

[0053] As illustrated in FIG. 7a, the control module (170) can perform time-difference injection control. Specifically, the control module (170) can initiate core injection through the inner injection nozzle (131) at time t0 and initiate shell injection through the outer injection nozzle (141) at time t0+Δt, after a set time difference Δt has elapsed. The time difference Δt can be set according to ground conditions, injection material viscosity, injection pressure, and auger rotation speed. Through this time-difference injection control, a structure can be formed in which the material for forming the core layer is first placed in the center, and then the material for forming the shell layer surrounds the outside.

[0054] The above time difference Δt can be set as a fixed value, but can be variably corrected according to at least one of ground conditions, injection material viscosity, injection pressure, injection amount, auger rotation speed, penetration depth, or target core-shell shape.

[0055] FIG. 7b illustrates a state in which a core layer (210) is formed by core injection through an inner injection passage (130). The inner injection nozzle (131) injects a core layer forming material downward or axially from the front center of the auger device (100). The injected core layer forming material is mixed with the excavated ground to form a central core layer (210).

[0056] FIG. 7c illustrates a state in which a shell layer (220) is formed by shell injection through an outer injection passage (140) and an outer injection nozzle (141). The outer injection nozzle (141) injects a shell layer forming material in a radial or diagonal direction from the outside of the inner injection nozzle (131). The injected shell layer forming material is distributed on the outer edge of the core layer (210) to form a shell layer (220).

[0057] As illustrated in FIG. 7d, the present invention can control the pressure ratio of the inner injection pressure P1 and the outer injection pressure P2. The control module (170) can control the pressure to satisfy the condition P2 ≥ P1 and, if necessary, can set a target range of P2 / P1. When the outer injection pressure P2 is maintained at or greater than the inner injection pressure P1, the outer distribution or outer covering of the material for forming the shell layer is improved, and a continuous shell layer (220) can be formed on the outer side of the core layer (210). At this time, the control module (170) can control the pressure ratio P2 / P1 to be maintained at 1 or greater and can variably set the target range of the pressure ratio P2 / P1 according to ground conditions, injection material viscosity, target shell layer thickness, or auger rotation speed.

[0058] As illustrated in FIG. 8, construction using the auger device (100) according to the present invention can be performed by sequentially forming a preceding construction body (310) and a subsequent construction body (320) along the direction of construction progress. Each construction body includes a core layer (210) in the center and a shell layer (220) in the outer part. A continuous SCW cutoff wall (300) can be formed by constructing parts of adjacent construction bodies so that they overlap each other in an overlapping section (330). The overlapping section (330) is an area for ensuring the continuity and watertightness of the cutoff wall. The control module (170) can calculate the center spacing, overlapping width, or overlapping rate of the preceding construction body (310) and the subsequent construction body (320) based on construction position data or penetration position data detected by the position sensor (165), and correct the construction position of the auger device (100) so that the set overlapping section (330) is formed.

[0059] FIG. 9 shows a modified arrangement of the inner injection nozzle (131) and the outer injection nozzle (141). In the basic form, the inner injection nozzle (131) is positioned at the center of the tip, and the outer injection nozzle (141) can be positioned on both sides or in the circumferential direction. In the multi-directional arrangement, the outer injection nozzle (141) can be positioned at different angles to enhance the radial diffusion of the material for forming the shell layer. In the height difference arrangement, the installation heights of the outer injection nozzle (141) can be different so that the material for forming the shell layer is dispersed in the depth direction. According to these modified examples, optimal injection tailored to the soil type, target wall width, target shell layer thickness, and fluidity of the injection material is possible. The outer injection nozzle (141) can be positioned in multiple numbers along the circumferential direction, and the multiple outer injection nozzles (141) can be positioned to have different injection angles, different installation heights, or different injection directions. Accordingly, the material for forming the shell layer can be uniformly distributed on the outer edge of the core layer (210).

[0060] As illustrated in FIG. 10, the present invention may include a function for storing and verifying construction quality data. A sensor module (160) transmits torque data, rotational speed data, injection pressure data, injection amount data, and location data to a control module (170). The control module (170) generates a control command by comparing the data with target conditions and can store depth-specific data, location-specific data, and time-specific data in a data storage unit (280). A user monitoring interface (290) can display real-time construction status, injection pressure, injection amount, rotational speed, and quality judgment results. After construction is completed, the quality data stored in the data storage unit (280) can be used to verify the quality of the SCW cutoff wall (300). In addition, the quality data stored in the data storage unit (280) can be stored in correspondence with the core layer formation conditions by depth, shell layer formation conditions by depth, pressure ratio P2 / P1, injection amount ratio and differential injection condition Δt, and can be used as data for setting construction conditions for subsequent sections, managing construction history, and verifying quality.

[0061] As illustrated in FIG. 6, the SCW cutoff wall construction control method using a dual-injection smart auger device according to the present invention may include a device preparation and penetration initiation step (S10), an auger rotation and ground excavation step (S20), a core material supply step through an inner injection passage (S30), a shell material supply step through an outer injection passage (S40), a detection step through a sensor module (S50), a detection value and target condition comparison step (S60), an inner-outer injection pressure ratio and injection amount adjustment step (S70), a selective staggered injection control and rotation speed correction step (S80), a core-shell cutoff body formation step (S90), and a quality data storage and construction completion step (S100).

[0062] In the device preparation and penetration start step (S10), the auger device (100) is placed at the construction site, and the operating status of the rotary drive unit (230), core pump (241), shell pump (251), compressor (260), sensor module (160), and control module (170) is checked.

[0063] In the auger rotation and ground excavation step (S20), the rotary drive unit (230) rotates the auger device (100), and the screw blade (120) excavates the ground (200). At this time, the position sensor (165) can detect the penetration depth or construction position of the auger device (100).

[0064] In the core material supply step (S30) through the inner injection passage, the core pump (241) supplies the core layer forming material through the inner injection passage (130), and the inner injection nozzle (131) sprays the core layer forming material into the center of the ground.

[0065] In the shell material supply step (S40) through the outer injection passage, the shell pump (251) supplies the shell layer forming material through the outer injection passage (140), and the outer injection nozzle (141) sprays the shell layer forming material in the direction of the outer core layer. At this time, the control module (170) may, if necessary, provide a time difference Δt between the injection start time of the inner injection nozzle (131) and the injection start time of the outer injection nozzle (141).

[0066] In the detection step (S50) through the sensor module, the torque sensor (161), rotational speed sensor (162), injection pressure sensor (163), injection amount sensor (164), and position sensor (165) each detect torque, rotational speed, injection pressure, injection amount, and position.

[0067] In the step of comparing the detected value and the target condition (S60), the control module (170) compares the detected value with the target condition. The target condition may include at least one of a target rotational speed, a target torque range, a target inner injection pressure P1, a target outer injection pressure P2, a target pressure ratio P2 / P1, a target injection amount ratio, an injection amount per target depth, and a construction body overlap rate per target location.

[0068] If the target conditions are not satisfied, the control module (170) may perform the step (S70) of adjusting the inner and outer injection pressure ratio and injection amount. For example, if the outer injection pressure is low, the control module (170) may increase the discharge pressure of the shell pump (251) or adjust the pressure control valve (271). Additionally, if the inner injection amount is excessive, the control module (170) may reduce the discharge amount of the core pump (241).

[0069] Additionally, the control module (170) can perform selective staggered injection control and rotational speed correction step (S80). In this step, the control module (170) can adjust the injection timing difference between the inner injection nozzle (131) and the outer injection nozzle (141), or increase or decrease the rotational speed of the auger device (100) to correct the formation state of the core layer (210) and the shell layer (220).

[0070] If the target condition is satisfied, a double-layer water barrier including a core layer (210) in the center and a shell layer (220) in the outer part is formed in the core-shell water barrier formation step (S90).

[0071] In the quality data storage and construction completion stage (S100), the control module (170) stores quality data detected during construction in the data storage unit (280) and displays the construction status and quality judgment results through the user monitoring interface (290). The stored data can be used for quality verification after construction, construction history management, and setting construction conditions for subsequent sections. Explanation of the symbols

[0072] 100: Auger device 110: Excavation Unit 120: Screw blade 130: Internal injection site 131: Internal injection nozzle 140: Lateral infusion channel 141: External injection nozzle 150: Air Hammer 151: Air ball 160: Sensor module 161: Torque sensor 162: Rotational speed sensor 163: Injection pressure sensor 164: Injection volume sensor 165: Position sensor 170: Control Module 180: Core material supply line 190: Shell material supply line 191: Compressed air supply line 200: Ground 210: Core layer 220: Shell layer 230: Rotary drive unit 241: Core pump 251: Shell pump 260: Compressor 270: Flow control valve 271: Pressure control valve 280: Data storage unit 290: User Monitoring Interface 300: SCW cutoff wall 310: Preceding construction body 320: Subsequent construction body 330: Overlapping part

Claims

Claim 1 A dual-injection type smart auger device for constructing a SCW cutoff wall of a groundwater storage dam comprises: an auger device rotatably installed; a rotary drive unit for rotating the auger device; a screw blade formed on the outer surface of the auger device; an inner injection passage formed inside the auger device and supplying material for forming a core layer; an outer injection passage formed outside the inner injection passage inside the auger device and supplying material for forming a shell layer; an inner injection nozzle connected to the end of the inner injection passage; an outer injection nozzle connected to the end of the outer injection passage; a sensor module for detecting the construction state of the auger device, comprising an injection pressure sensor for detecting the injection pressure of the inner injection passage and the outer injection passage, and a position sensor for detecting the construction position or penetration position of the auger device; and a control module for independently controlling the injection conditions of the inner injection nozzle and the outer injection nozzle based on data detected by the sensor module.The control module includes, wherein the control module initiates the injection of the core layer forming material through the inner injection nozzle at time t0, and initiates the injection of the shell layer forming material through the outer injection nozzle at time t0+Δt after a set time difference Δt has elapsed, wherein the time difference Δt is variably set according to at least one of ground conditions, injection material viscosity, injection pressure, injection amount, rotational speed of the auger device, or penetration depth, and in a dual injection section where injection through the inner injection nozzle and the outer injection nozzle is performed simultaneously, the control module compares the inner injection pressure P1 of the inner injection nozzle and the outer injection pressure P2 of the outer injection nozzle detected by the injection pressure sensor, and controls the outer injection pressure P2 to be greater than or equal to the inner injection pressure P1 so that the shell layer forming material is distributed to the outside of the core layer forming material, and based on construction position data or penetration position data detected by the position sensor, the preceding construction body and the succeeding A dual-injection type smart auger device for constructing a SCW cutoff wall for a groundwater storage dam, comprising calculating at least one of the center spacing, overlap width, or overlap ratio of the construction bodies, correcting the construction position or penetration position of the auger device so that the preceding construction body and the subsequent construction body overlap each other at a set overlap portion, and controlling the separate supply of materials of different compositions or materials with different injection conditions through the inner injection passage and the outer injection passage so that a core layer in the center is formed through the inner injection nozzle and a shell layer surrounding the outer edge of the core layer is formed through the outer injection nozzle. Claim 2 A dual injection type smart auger device according to claim 1, wherein the inner injection passage is disposed in the center of the auger device, and the outer injection passage is disposed as an annular channel or a plurality of independent channels surrounding the outer side of the inner injection passage. Claim 3 A dual-injection smart auger device according to claim 1, wherein the inner injection nozzle is positioned at the tip center of the auger device or at an adjacent position to inject the core layer forming material in an axial direction, a downward direction, or a radial auxiliary direction, and the outer injection nozzle is positioned in a plurality along the circumferential direction on the outer side of the inner injection nozzle, and the plurality of outer injection nozzles are positioned to have at least one of different injection angles, different installation heights, or different injection directions. Claim 4 A dual-spray smart auger device according to claim 1, wherein an air hammer for assisting ground penetration is installed at the tip of the auger device, an air hole for spraying compressed air is formed at the air hammer or an adjacent part thereof, and the control module is configured to control at least one of the supply pressure, supply amount, and operating time of a compressor that supplies compressed air to the air hole. Claim 5 A dual injection type smart auger device according to claim 1, wherein the sensor module further comprises, in addition to the injection pressure sensor and the position sensor, at least one of a torque sensor for detecting the rotational resistance of the auger device, a rotational speed sensor for detecting the rotational speed of the auger device, and an injection amount sensor for detecting the injection amount of the core layer forming material and the shell layer forming material. Claim 6 A dual injection type smart auger device according to claim 1, wherein the control module is configured to compare at least one of torque, rotational speed, injection pressure, injection amount, and position data detected by the sensor module with a target condition, and to adjust at least one of the rotational speed, inner injection pressure, outer injection pressure, inner injection amount, and outer injection amount of the auger device according to the comparison result. Claim 7 delete Claim 8 delete Claim 9 A dual-spray smart auger device according to claim 1, wherein the core layer forming material is a material in which at least one of strength development, shape retention, solid content, and viscosity is adjusted differently from the shell layer forming material, and the shell layer forming material is a material in which at least one of water impermeability, low permeability, fluidity, and ground contact is adjusted differently from the core layer forming material, and the core layer forming material and the shell layer forming material comprise at least one of a cementitious binder, a slag-based binder, a fly ash-based material, a gypsum-based reactive material, a bentonite-based material, an expansive agent, a viscosity modifier, a strength development promoter, and a water impermeability enhancer. Claim 10 A dual injection type smart auger device according to claim 1, wherein the control module controls at least one of a rotary drive unit for rotating the auger device, a core pump for supplying material for forming a core layer to the inner injection passage, a shell pump for supplying material for forming a shell layer to the outer injection passage, a flow control valve, and a pressure control valve. Claim 11 A dual-injection type smart auger device according to claim 1, further comprising a data storage unit connected to the control module for storing construction quality data, wherein the data storage unit stores depth-specific data, location-specific data, and time-specific data in correspondence with at least one of the inner injection pressure P1, outer injection pressure P2, pressure ratio P2 / P1, injection amount ratio, rotational speed, and differential injection condition Δt, and wherein the control module is configured to perform at least one of quality verification of the SCW cutoff wall, construction history management, or setting construction conditions for a subsequent section using the data stored in the data storage unit. Claim 12 A dual-injection smart auger device according to claim 1, further comprising a user monitoring interface connected to the control module and displaying at least one of a real-time construction status, an inner injection pressure P1, an outer injection pressure P2, a pressure ratio P2 / P1, an injection volume ratio, a rotational speed, a differential injection condition Δt, and a quality judgment result. Claim 13 delete Claim 14 A control method for a dual-injection type smart auger device for constructing an SCW cutoff wall of a groundwater storage dam, comprising: a step of rotating the auger device to penetrate into the ground; a step of detecting an inner injection pressure P1 of an inner injection nozzle and an outer injection pressure P2 of an outer injection nozzle through an injection pressure sensor of a sensor module, and detecting the construction position or penetration position of the auger device through a position sensor of the sensor module; a step of supplying a core layer forming material through an inner injection passage and initiating the injection of the core layer forming material through the inner injection nozzle at time t0; a step of initiating the supply and injection of a shell layer forming material through the outer injection passage and the outer injection nozzle at time t0+Δt, after a set time difference Δt has elapsed, wherein the time difference Δt is variably set according to at least one of ground conditions, injection material viscosity, injection pressure, injection amount, rotation speed of the auger device, or penetration depth; and through the inner injection nozzle and the outer injection nozzle A control method for a dual-injection type smart auger device, comprising: a step in which, in a dual injection section where injection is performed together, a control module compares the inner injection pressure P1 and the outer injection pressure P2, and controls the outer injection pressure P2 to be greater than or equal to the inner injection pressure P1; a step of calculating at least one of the center gap between a preceding construction body and a succeeding construction body, the overlap width, or the overlap rate based on construction position data or penetration position data detected by the position sensor, and correcting the construction position or penetration position of the auger device so that the preceding construction body and the succeeding construction body overlap each other in a set overlap section; and a step of separately supplying materials of different compositions or materials with different injection conditions through the inner injection passage and the outer injection passage, and distributing the shell layer forming material to the outside of the core layer forming material by the pressure control and the time difference control, thereby forming a core-shell structure SCW cutoff wall that includes a core layer in the center and a shell layer in the outer part, and in which adjacent construction bodies overlap in the set overlap section.

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