Discharge slurry volume management system for injection auxiliary water construction, and soil discharge type deep mixing method

Abstract

To perform improved soil mixing processing in which a slurry amount discharged into a ground in a pull-out construction with respect to a penetration auxiliary water amount is managed with high accuracy and to reasonably develop strength at the time of blend planning in a ground improvement.SOLUTION: A discharged slurry amount management system for a penetration auxiliary water construction comprises: a quality management unit 20A in which a planned slurry water-cement ratio, a planned slurry amount, a planned penetration auxiliary water amount, a planned penetration speed, and a planned correction water cement ratio (a sum of a planned compound water and a planned penetration auxiliary water) that are obtained in planning a construction are inputted; a construction measurement unit 20B for measuring a real construction depth, a real penetration speed, and a real penetration auxiliary water amount in constructing; a construction management unit 20C for obtaining a real correction water-cement ratio based on the real construction depth, the real penetration speed, and the real penetration auxiliary water amount measured by the construction measurement unit 20B; and a calculation unit 20D for comparing the planned correction water-cement ratio with the real correction water-cement ratio and calculating a real slurry amount and pull-out speed in a pull-out construction of a rotation rod.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a slurry discharge amount management system for intrusion auxiliary water construction, and a soil discharge type deep mixing treatment method. [Background technology]

[0002] Conventionally, ground improvement methods in urban areas have often involved close-proximity construction, and there has been a demand for displacement-reducing methods that limit the displacement of the surrounding ground. For example, a deep soil-discharge mixing method using a treatment machine with two rotating shafts, as shown in Patent Document 1, is known. Patent Document 1 describes a displacement-reducing ground improvement method in which, when penetrating two rotating shafts, an amount of soil equivalent to the amount of solidification material to be supplied is actively removed, and then, when the rotating shafts are pulled out, solidification material is supplied to the penetrated ground and mixed, thereby preventing ground expansion that accompanies the supply of solidification material and avoiding displacement of the surrounding ground. In this case, since no solidification material is supplied at the time of penetration, the soil is removed as it was in the original state without being mixed with the solidification material.

[0003] Furthermore, there are also cases where a biaxial ground improvement method is implemented that allows for large-diameter improvement by increasing the improvement area with a large-diameter mixing blade, and in this case, there is an advantage in that construction costs can be reduced. When performing penetration construction with a large-diameter mixing blade, the penetration resistance increases, so the penetration speed decreases and construction efficiency tends to decrease. Therefore, in Patent Document 2, for example, water is discharged from the lower outlet during penetration to promote fluidization, thereby reducing the penetration resistance and ensuring the construction speed, and slurry is discharged from the upper outlet during withdrawal, and the improved body is created by stirring and mixing.

[0004] In recent years, there have been cases in which the actual construction work has exceeded the planned ground resistance, requiring the discharge of a larger amount of supplementary penetration water than planned. In such cases, there has been a tendency for a larger amount of solidification material to be added to the ground during extraction, making it necessary to instantly and accurately calculate the amount of solidification material slurry. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 4885325 Summary of the Invention [Problem to be solved by the invention]

[0006] However, it is difficult to quantitatively grasp the ground resistance during penetration in advance, and it was necessary to assume many cases in which the planned auxiliary penetration water volume was exceeded, and to set the amount of slurry of the solidification material to be discharged according to the water-cement ratio of the mix test by combining the extraction speed and the amount of slurry supplied from the plant. Furthermore, the operator had to immediately make a decision regarding the auxiliary penetration water volume that exceeded the planned auxiliary penetration water volume, which created problems in terms of accuracy and difficulty in managing the amount of slurry.

[0007] In addition, the standard control system only showed the penetration speed and auxiliary penetration water volume at the construction depth at the time of penetration on the display, and the only record that could be confirmed was the total depth output as a construction record when extraction was finished and construction was completed. Therefore, it was necessary to manually record the penetration speed and the auxiliary penetration water supply volume (liters / min) from the plant when the auxiliary penetration water exceeded the planned value, and adjust the slurry supply volume from the plant and the extraction speed when the relevant depth was reached at the time of extraction construction, which created problems with accuracy. If adjustments were required at multiple depths, it was thought that it would be difficult to respond.

[0008] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a management system for the amount of slurry discharged for intrusion auxiliary water construction, which can perform improved soil mixing processing by precisely controlling the amount of slurry discharged into the ground during withdrawal construction in relation to the amount of intrusion auxiliary water, and which can rationally achieve the strength at the time of the mix planning in ground improvement, and a soil discharge type deep mixing processing method. [Means for solving the problem]

[0009] In order to achieve the above object, the present invention provides a slurry discharge amount management system for auxiliary water penetration construction, which manages improved soil by mixing a slurry produced in a plant with the ground when a rotating rod provided in a soil discharge type deep mixing machine penetrates the improved ground, and discharging auxiliary water penetration toward the ground when the rotating rod penetrates the ground, and includes a quality management unit to which a planned slurry water-cement ratio, a planned slurry amount, a planned auxiliary water penetration amount, a planned penetration speed, and a planned corrected water-cement ratio obtained at the time of construction planning is input, a construction measurement unit to measure an actual construction depth, an actual penetration speed, and an actual auxiliary water penetration amount during construction, and a construction management unit to obtain an actual corrected water-cement ratio based on the actual construction depth, the actual penetration speed, and the actual auxiliary water penetration amount measured by the construction measurement unit, During the pulling out of the rotating rod, The planned corrected water-cement ratio is compared with the actual corrected water-cement ratio, The discharge supplied from the plant so that the actual corrected water-cement ratio matches the planned corrected water-cement ratio. and a calculation unit for calculating the amount of slurry and the withdrawal speed.

[0010] In addition, the soil discharge type deep mixing method according to the present invention is a soil discharge type deep mixing method in which, when a rotating rod provided in a soil discharge type deep mixing machine is penetrated into the improved ground, a slurry produced in a plant is mixed into the ground, and when the rotating rod penetrates, penetration auxiliary water is discharged toward the ground to improve the ground. The method includes the steps of determining the planned slurry water-cement ratio, planned slurry volume, planned penetration auxiliary water volume, planned penetration speed, and planned corrected water-cement ratio obtained at the time of construction planning, which is a combination of the planned mix water and the planned penetration auxiliary water, measuring the actual construction depth, actual penetration speed, and actual penetration auxiliary water volume during construction, and obtaining the actual corrected water-cement ratio based on the previously measured actual construction depth, actual penetration speed, and actual penetration auxiliary water volume. During the pulling out of the rotating rod, The planned corrected water-cement ratio is compared with the actual corrected water-cement ratio, The discharge supplied from the plant so that the actual corrected water-cement ratio matches the planned corrected water-cement ratio. and determining the amount of slurry and the withdrawal speed.

[0011] In the present invention, the amount of slurry of the solidification material to be discharged into the ground can be automatically calculated based on the construction information of the penetration auxiliary water amount measured by the management device, and the construction speed at the time of withdrawal and the amount of slurry supplied from the plant can be efficiently supplied, and accurate strength can be achieved in the ground improvement. 。 In other words, the conditions for the planned slurry water-cement ratio, planned slurry volume, planned penetration auxiliary water volume, planned penetration speed, and planned modified water-cement ratio combining the planned mix water and planned auxiliary water, which can realize the design standard strength required by the improved soil mix test for penetration auxiliary water construction, are input. During the actual construction, the actual modified water-cement ratio is calculated from the actual construction depth, actual penetration speed, and actual penetration auxiliary water volume measured and input by the control instrument. If the actual auxiliary water volume is greater than planned and the actual modified water-cement ratio is greater than the planned modified water-cement ratio, the value of the planned modified water-cement ratio is calculated. Discharge Calculate the amount of slurry. Discharge Slurry volume can be realized, supplied from the plant Discharge The amount of slurry and the extraction speed are displayed to the operator as control values, and the state of the extraction work can be automatically read, checked, and recorded from the control instrument. As a result, in this invention, the amount of auxiliary water for penetration can be calculated based on the ground condition during the extraction work. Discharged slurry It is possible to perform improved soil mixing treatment with precisely controlled quantities, and the strength can be rationally achieved as planned in the ground improvement mix design.

[0012] In addition, in the control system for the amount of discharged slurry for the construction of auxiliary water penetration according to the present invention, when the actual auxiliary water volume becomes larger than the planned auxiliary water volume and the actual corrected water-cement ratio becomes larger than the planned corrected water-cement ratio, the calculation unit calculates the amount of discharged slurry for the auxiliary water penetration according to the present invention so that the actual corrected water-cement ratio becomes equal to the value of the planned corrected water-cement ratio. Discharge The amount of slurry may be calculated.

[0013] In addition, the soil discharge type deep mixing treatment method according to the present invention may be characterized in that, prior to construction, an improved soil mix test is conducted to test the mix of the improved soil to be applied by the soil discharge type deep mixing treatment machine, and the planned corrected water-cement ratio is determined in the improved soil mix test.

[0014] In this invention, by controlling the amount of auxiliary water based on the results obtained by the improved soil mix test method when the rotating rod penetrates, it is possible to minimize the displacement of the surrounding ground during ground improvement, and the amount of slurry at the time of drawing and discharging to achieve strength development can be automatically and instantly specified and controlled, making it suitable for displacement-reducing deep mixing treatment with soil discharge, and allowing the effective adoption of a soil discharge type biaxial deep mixing treatment method. Effect of the Invention

[0015] According to the present invention's slurry discharge amount management system for intrusion auxiliary water construction and the soil discharge type deep mixing treatment method, it is possible to perform improved soil mixing treatment with precise control of the amount of slurry discharged into the ground during withdrawal construction in relation to the amount of intrusion auxiliary water, and to rationally achieve the strength required at the time of mix planning in ground improvement. [Brief description of the drawings]

[0016] [Figure 1] 1(a) to 1(f) are diagrams showing steps of a soil discharge type deep mixing method according to a first embodiment of the present invention. [Diagram 2] FIG. 1 is a schematic diagram showing a configuration of a management system. [Diagram 3] This is a construction management item diagram showing the contents of construction management. [Figure 4] FIG. 1 is a flow chart showing the process of an improved soil mix test method and a soil discharge deep mixing treatment method according to a first embodiment of the present invention. [Diagram 5] FIG. 11 is a flow chart showing the steps of an improved soil mix test method and a soil discharge deep mixing treatment method according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, a slurry discharge amount management system for intrusion auxiliary water construction according to an embodiment of the present invention and a soil discharge type deep mixing treatment method will be described with reference to the drawings.

[0018] (First embodiment) As shown in Figures 1 and 2, the discharge slurry amount management system for auxiliary water application during penetration in this embodiment (hereinafter simply referred to as the management system 20) is intended to manage the improved soil by mixing the solidification material slurry produced in the plant with the ground G when the rotating rod 11 provided on the soil discharge type deep mixing treatment machine 1 penetrates the improved ground, and by discharging penetration auxiliary water toward the ground G when the rotating rod 11 penetrates. The soil discharge type deep mixing method of this embodiment is a construction method for performing deep mixing by using the results (actual slurry volume) obtained by the above-mentioned management system 20 and ejecting slurry during construction by pulling out the rotating rod 11 of the soil discharge type deep mixing machine 1. In the first embodiment, a first improved soil mix test method is applied for testing the mix of improved soil executed by the soil discharge type deep mixer 1.

[0019] As shown in Figures 1(a) to (f), the soil-discharge type deep mixing machine 1 is equipped with two rotating rods 11, 11 arranged in parallel and equipped with mixing blades 12 at their tips, a spiral 13 provided on the outer peripheral surface of each of these two rotating rods 11, 11, and a solidification material discharge outlet 14 that sprays solidification material from the tips of the rotating rods 11, 11 onto the ground G.

[0020] Each rotating rod 11 has an excavation blade 15 at its tip, and is driven independently by its own drive motor 16. The rotation direction of these rotating rods 11, 11 is the direction in which the spiral 13 rotates and soil is discharged when penetrating and pulling out. When pulling out, the excavated soil is discharged in a state where it is gathered in the center between the two rotating rods 11, 11.

[0021] The stirring blades 12 are provided in multiple stages (four stages in the illustrated example) on the tip side of each of the two rotating rods 11, 11. The stirring diameter of the stirring blades 12 provided on each rotating rod 11 can be, for example, 1600 mm.

[0022] The solidification material discharge port 14 is provided near the stirring blade 12 of each rotating rod 11, 11. A flow path (not shown) is provided inside the rotating rod 11 over the entire axial direction, and the solidification material supplied to the upper end of the flow path flows up to the solidification material discharge port 14. Specifically, the solidification material is discharged from the solidification material discharge port 14 on the lower side when processing the tip of the improved portion when the rod penetrates, and is discharged from the solidification material discharge port 14 on the upper side when pulling out. In the case of two-shaft rotating rods 11, 11 as in this embodiment, the solidification material discharge ports 14 on the lower side and the upper side are used by switching between them.

[0023] Next, the management system 20 for the penetration auxiliary water application will be specifically described with reference to Figs.

[0024] The management system 20 is applied to auxiliary penetration water construction in which, when the rotating rod 11 provided on the soil discharge type deep mixer 1 penetrates the improved ground, slurry produced at the plant is mixed into the ground G, and auxiliary penetration water is discharged toward the ground G when the rotating rod 11 penetrates, thereby managing the improved soil. In the management system 20, the equipment provided on the construction machine side (the soil discharge type deep mixer 1 side) is connected by wire or wirelessly to the equipment provided on the plant side and the equipment provided in the control room side.

[0025] The management system 20 includes a quality management section 20A that performs management during construction planning, and a construction measurement section 20B, a construction management section 20C, and a calculation section 20D that perform management during construction.

[0026] The quality control unit 20A receives inputs of the planned slurry water-cement ratio, planned slurry volume, planned penetration auxiliary water volume, planned penetration speed, and planned corrected water-cement ratio combining the planned mix water and planned auxiliary water, which are obtained at the time of construction planning. During penetration construction using the soil discharge type deep mixer 1, the penetration slurry is discharged based on the planned corrected water-cement ratio inputted in the quality control unit.

[0027] On the construction machine side, a system measurement panel 21 and a construction management device 22 installed in the driver's seat of the soil discharge type deep mixer 1 are provided. The system measurement panel 21 and the construction management device 22 transmit and receive data D such as measurement data detected by a construction measurement unit 20B described later.

[0028] The system measurement panel 21 collects measurement data detected by measuring instruments provided as the construction measurement section 20B. The construction measurement section 20B includes a depth / speed detector 23 for measuring the depth (actual construction depth) and elevation speed (actual penetration speed) of the tip of the rotating rod 11 constructed by the construction machine (deep soil discharge type mixer 1), a rotation detector 24 for measuring the number of rotations of the rotating rod 11, and a current detector 25 for measuring the current value of the drive motor 16 that drives the rotating rod 11. The construction measurement section 20B also includes instruments (not shown) such as a flow meter for measuring the amount of auxiliary water when the rotating rod 11 penetrates.

[0029] The measured values ​​detected by the depth / speed detector 23, the rotation detector 24, and the current detector 25 are collected in the system measurement panel 21 and sent to the construction management device 22. The construction management device 22 has a construction management section 20C and a calculation section 20D. In the construction management section 20C, an actual corrected water-cement ratio is obtained based on the actual construction depth, the actual penetration speed, and the actual penetration auxiliary water amount measured in the construction measurement section 20B.

[0030] The calculation unit 20D compares the planned modified water-cement ratio obtained by the quality control unit 20A with the actual modified water-cement ratio obtained by the construction control unit, and calculates the actual slurry volume and the pulling speed during the pulling construction of the rotating rod 11. For example, when the actual auxiliary penetration water volume is greater than the planned auxiliary penetration water volume and the actual modified water-cement ratio is greater than the planned modified water-cement ratio, the calculation unit 20D can calculate the actual slurry volume so that the actual modified water-cement ratio becomes the value of the planned modified water-cement ratio.

[0031] In the construction of auxiliary water penetration using a soil-discharge type deep layer mixer 1, the plant produces slurry to be injected from the soil-discharge type deep layer mixer 1 into the ground G when the rotating rod 11 of the soil-discharge type deep layer mixer 1 is pulled out after penetration. A pair of auxiliary water / slurry flow meters 26 (26A, 26B) are provided on the plant side. These auxiliary water / slurry flow meters 26A, 26B detect the flow rates of auxiliary water and slurry. The flow rate values ​​measured by each of the auxiliary water / slurry flow meters 26A, 26B are collected in the system measurement panel 21 on the construction machine side and sent to the construction management device 22.

[0032] The control room is provided with, for example, a computer 27 for creating daily reports and a printer 28. The computer 27 is connected to the construction control device 22, and is capable of exchanging data D. The printer 28 outputs the control results, etc., created by the computer 27.

[0033] Next, the management items and management contents of the management system 20 will be described more specifically with reference to FIG. 2 and FIG. The management system 20 of this embodiment manages the quality of the material, the finished shape of the improved body, and displacement.

[0034] As shown in Figure 3, the quality of materials is controlled by controlling the materials of the slurry used in the penetration auxiliary water construction and produced at the plant, the slurry composition, and mixing (mixing state of the slurry). The management of the slurry material involves measuring the material and inspecting it using a measuring device. The measured values ​​of the material inspected using the measuring device are sent to the computer 27, for example, in a digital printout table. The slurry mix is ​​controlled by the following: the amount of improved soil per 1 m2 detected using a penetration auxiliary water or solidification material slurry flow meter (auxiliary water / slurry flow meter 26A shown in Figure 2) and a treatment machine lifting speed meter (depth / speed detector 23 shown in Figure 2). 3 This is to confirm the amount of cement applied. The mixing state of the slurry is controlled by checking the mixing performance using the shaft revolution meter (revolution detector 24) of the soil discharge type deep bed mixer 1 (processing machine).

[0035] The finished shape of the improved body is determined by the casting position, casting depth, and bottom-settling state of the soil piles using the soil-discharging deep mixer 1. The casting position is controlled by checking the casting position of each pile using surveying equipment such as a total station. The casting depth is controlled by checking the casting depth of each pile detected by the pile depth gauge (depth / speed detector 23 shown in Figure 2). The bottom-settling state is controlled by checking that the piles have reached the specified depth, as detected by the hydraulic gauge or ammeter (current detector 25 shown in Figure 2) of the pile rotation motor and the pile lifting / lowering speed gauge (depth / speed detector 23 shown in Figure 2).

[0036] The displacement of the improvement body is controlled by checking the amount of soil discharged from each treatment pile based on the treatment machine rotation meter (rotation detector 24 shown in Figure 2) and the screw shape, etc.

[0037] In the management system 20, the managed contents, such as the quality of the materials, the finished shape of the improved body, and displacement, are sent to a computer 27 for construction evaluation, and if they are suitable for construction (= YES), a daily report is created on a personal computer (PC), and if they are not suitable (= NO), corrective construction is carried out.

[0038] Here, the concept of the water-cement ratio of the slurry managed by the management system 20 will be described below. The following five mixes were considered during construction planning. Mixed cement mass: C 配合 (kg) Blended water mass: W 配合 (kg) Water-cement ratio: W 配合 / C 配合 Designed auxiliary water volume for penetration: W 計画補助 (kg) Planned corrected water-cement ratio: (W 配合 +W 計画補助水 ) / C 配合 There are two mixes for penetration construction: Amount of auxiliary water for actual penetration: W 施工補助水 (kg)>W配合 Actual modified water-cement ratio: (W 配合 +W 施工補助水 ) / C 配合 >(W 配合 +W 計画補助水 ) / C 配合 There are three mixes for pulling construction: Actual cement mass: C 引抜 (kg)>C 配合 Actual water-cement ratio: W 引抜 / C 引抜 =W 配合 / C 配合 Extraction corrected water-cement ratio: (W 引抜 +W 施工補助水 ) / C 引抜 =(W 配合 +W 計画補助水 ) / C 配合

[0039] Next, the first improved soil mix test method and the first soil discharge type deep mixing treatment method using the above-mentioned management system 20 will be specifically described with reference to the drawings. The first soil discharge type deep mixing treatment method includes a step of determining the planned slurry water-cement ratio, planned slurry volume, planned auxiliary penetration water volume, planned penetration speed, and planned modified water-cement ratio obtained by combining the planned mix water and the planned auxiliary penetration water at the time of construction planning, a step of measuring the actual construction depth, actual penetration speed, and actual auxiliary penetration water volume at the time of construction, a step of obtaining the actual modified water-cement ratio based on the actual construction depth, actual penetration speed, and actual auxiliary penetration water volume measured in advance, and a step of comparing the planned modified water-cement ratio with the actual modified water-cement ratio to determine the actual slurry volume and withdrawal speed at the time of construction when the rotating rod 11 is withdrawn.

[0040] First, the first improved soil mix mix test method will be explained with reference to FIG. In step S1, a specified amount of sample soil is mixed with a specified amount of auxiliary water that is discharged toward the ground G when the rotating rod 11 (see FIG. 1) penetrates. After that, the sample soil mixed in step S1 and the specified amount of auxiliary water are mixed for 10 minutes (step S2) to prepare a specified amount of water content sample soil (step S3). The time required for the primary mixing is usually about 10 minutes as specified in the Geotechnical Society standard JGS0821-2009.

[0041] Next, in step S4, the hardening material is mixed with the specified amount of the water content sample soil prepared in step S3. After that, the mixed amount of the water content sample soil and the hardening material are subjected to secondary mixing for 10 minutes (step S5) to prepare an improved soil specimen (step S6). The time required for secondary mixing is usually about 10 minutes as specified in the Geotechnical Society standard JGS0821-2009. The above steps S1 to S6 constitute the work flow of the first improved soil mixture test method.

[0042] Next, the first soil discharge type deep mixing treatment method will be specifically explained. In the first soil discharge type deep mixing treatment method, first, in step S7, a strength test is carried out on the improved soil specimen prepared by the above-mentioned first improved soil mixture test method, and the mixture is analyzed. That is, a strength test is carried out by changing the mixture of the improved soil specimen prepared in step S7, and a combination of the penetration auxiliary water volume and the mixture is selected.

[0043] After that, in step S8, the auxiliary water volume for penetration is set based on the analysis results of the improved soil specimen when the rotating rod 11 of the soil discharge type deep layer mixer 1 shown in Fig. 1 penetrates the ground G, which will be described later, while controlling the auxiliary water volume (the auxiliary water volume for penetration set in step S8) for promoting fluidization by discharging water from the solidification material discharge port 14 provided on the mixing blade 12 shown in Fig. 1 toward the ground G for each excavation depth.

[0044] In specific construction, first, the construction conditions of the planned mix, that is, the planned slurry water-cement ratio, the planned slurry volume, the planned penetration auxiliary water volume, the planned penetration rate, and the planned corrected water-cement ratio which is the sum of the planned mix water and the planned auxiliary water, are input to the quality control section in the management system 20 shown in FIG. 2.

[0045] Next, as shown in Figures 1(a) and (b), after the soil discharge type deep layer mixer 1 is positioned at a predetermined construction position, the two-shaft rotating rods 11, 11 are rotated to penetrate into the ground G. At this time, the rotation amount of the rotating rods 11, 11 is appropriately controlled in consideration of the actual penetration speed, and soil is discharged by each spiral 13. At this time, water is discharged toward the ground G from the solidification material discharge port 14 provided on the mixing blade 12, and penetration is performed while controlling the penetration auxiliary water amount (the penetration auxiliary water amount set in the above step S8) for promoting fluidization for each excavation depth.

[0046] The amount of auxiliary water discharged for each excavation depth is measured by the auxiliary water / slurry flowmeter 26A on the plant side in Fig. 2 and is recorded in the construction management device at the same time as construction. Then, the actual corrected water-cement ratio is calculated from the actual construction depth, actual penetration speed, and the amount of auxiliary water discharged during construction, which are previously measured in the construction management section 20C of the construction management device 22. Thereafter, the calculation unit 20D compares the planned modified water-cement ratio with the actual modified water-cement ratio, and calculates the amount of slurry to be discharged during the drawing work so that the actual modified water-cement ratio matches that of the plan, and specifies the actual amount of slurry supplied from the plant and the drawing speed, which are managed as construction control values ​​during the drawing work.

[0047] Then, as shown in FIG. 1(c), when the tips (drilling blades 15) of the rotating rods 11, 11 reach a predetermined bottom end depth of improvement, penetration is stopped.

[0048] 1(d) and (e), the rotating rods 11, 11 are pulled out halfway into the improved area P. At this time, each rotating rod 11 discharges the above-mentioned amount of slurry of solidification material from the solidification material discharge port 14 while the rotating rods 11, 11 and the stirring blades 12 are pulled up while maintaining the rotation at the time of penetration, thereby completing ground improvement of the improved area P for one span (see FIG. 1(f)). At this time, the withdrawal speed and the amount of slurry sent from the plant are displayed on the construction management device 22 in FIG. 2, and are evaluated and judged by the construction management device 22 as the measured amounts from the construction management meters (flow meter, elevation speed meter) in FIG.

[0049] After the improvement body has been constructed to the desired depth, the entire soil discharge type deep mixer 1 is pulled above ground as shown in Figure 1(f) and moved to the next construction location. Based on the auxiliary water volume for penetration obtained by the above-mentioned improved soil mix test method, the steps in Figures 1(a) to (f) are repeated in the same manner to construct another improvement body.

[0050] As described above, in the present embodiment, the discharged slurry amount management system for the penetration auxiliary water construction and the soil discharge type deep mixing treatment method can perform improved soil mixing treatment with precise control of the amount of auxiliary water discharged into the ground G, and since the slurry amount can be instantly controlled to ensure the improvement strength is achieved, the exact strength of the ground improvement can be grasped.

[0051] (Second embodiment) Next, the discharge slurry amount management system for the supplementary water application at the time of penetration according to the second embodiment and the soil discharge type deep mixing treatment method will be described with reference to the flow chart shown in FIG. The second embodiment applies a second improved soil mix test method for testing the mix of improved soil executed by a soil discharge type deep mixer 1. The soil discharge type deep mixer 1 (see Fig. 1) for testing the mix of improved soil in this test method is the same as that in the first embodiment described above. The second embodiment will also be described with reference to Figs. 1 to 4 used in the first embodiment.

[0052] First, in step S10, a specified amount of sample soil is prepared. On the other hand, the penetration speed of the rotating rod 11 (see FIG. 1) and a predetermined amount of auxiliary penetration water to be discharged toward the ground G are set (step S11). After that, the amount of auxiliary penetration water to be added to the target soil being stirred at the penetration speed set in step S11 is calculated (step S12). Specifically, the amount of auxiliary penetration water per volume of the target soil to be improved is calculated. Then, in step S13, the soil discharge rate is set from the amount of auxiliary penetration water to be added, and the amount of soil to be discharged is calculated. Furthermore, the amount of cement to be added and the amount of water to be mixed are calculated from the specified mix ratio (water-cement ratio) for the amount of target soil to be improved after the soil is discharged (step S14).

[0053] Then, in step S15, a corrected water-cement ratio (corrected water-cement ratio) is calculated from the calculated amount of cement to be added, the amount of mixed water, and the amount of auxiliary water for penetration. A hardening material with a corrected water-cement ratio is mixed with the specified amount of sample soil prepared in step S10 (step S16). Then, the specified amount of sample soil mixed in step S10 and the hardening material with the corrected water-cement ratio are stirred for 10 minutes (step S17) to prepare an improved soil specimen (step S18). The time required for mixing at this time is usually about 10 minutes, as stipulated in the Geotechnical Society standard JGS0821-2009. Steps S10 to S18 described above constitute the work flow of the second improved soil mixture test method.

[0054] Next, in the second soil discharge type deep mixing treatment method, first, in step S19, a strength test is carried out on the improved soil specimen prepared by the second improved soil mixture test method described above, and the mixture is analyzed. Specifically, a strength test is carried out by changing the mixture of the improved soil specimen prepared in step S19, and a combination of the penetration auxiliary water volume and the mixture is selected.

[0055] After that, in step S20, the planned auxiliary water volume for penetration is set based on the analysis results of the improved soil specimen. Then, during the construction described below, water is discharged from the solidification material discharge port 14 provided on the mixing blade 12 toward the ground G to promote fluidization, and the construction is performed by controlling the auxiliary water volume (planned auxiliary water volume for penetration set in step S20) for each excavation depth. The specific implementation of slurry volume management during extraction based on the actual penetration auxiliary water volume in the actual construction is the same as in the first embodiment described above, so a detailed explanation will be omitted here.

[0056] In the second embodiment, the test can be performed with the sample soil properties as they are at the site. For the hardening material to be mixed, the amount of auxiliary water for penetration is added to the mixing water for the specified mix, and the water and cement amount is newly corrected and calculated taking into account the amount of soil discharge. An improved soil specimen is created by mixing the hardening material mixed with this corrected water and cement amount with the sample soil, and the amount of auxiliary water for penetration of the agitator blade 12 of the soil discharge type deep layer mixer 1 can be set based on the analysis results of the improved soil specimen.

[0057] In this way, in the second embodiment, it is possible to carry out a mix test in advance that reflects the change in soil properties (increase in moisture, decrease in soil particle content) due to the supplementary water, and to control it. In particular, in this embodiment, as described above, the supplementary water is discharged when the rotating rod 11 penetrates, so that mixed soil with a high moisture content is discharged, but since the amount of the supplementary water discharged is precisely controlled to an appropriate amount, it is possible to keep the displacement of the surrounding ground small during ground improvement.

[0058] In addition, the method for preparing the improved soil specimens can be according to the conventional method (Geotechnical Society Standard JGS0821-2009, "Method for preparing specimens of stabilized soil without compaction"), which allows for comparison and verification with other test results and ensures reproducibility, thereby guaranteeing the test results.

[0059] The above describes the embodiment of the discharged slurry amount management system for the intrusion auxiliary water construction according to the present invention, and the soil discharge type deep mixing treatment method. However, the present invention is not limited to the above embodiment, and can be appropriately modified within the scope of the spirit of the present invention.

[0060] For example, in the above-mentioned embodiment, in the management system 20, the calculation unit 20D manages so that when the actual penetration auxiliary water amount is greater than the planned penetration auxiliary water amount and the actual corrected water-cement ratio is greater than the planned corrected water-cement ratio, the actual slurry amount is calculated so that the actual corrected water-cement ratio becomes equal to the value of the planned corrected water-cement ratio, but the management method is not limited to this.

[0061] In addition, in this embodiment, before construction, an improved soil mix test is conducted to test the mix of the improved soil to be constructed by the soil discharge type deep mixer 1, and a method is adopted in which the planned corrected water-cement ratio is determined in the improved soil mix test, but a construction method may also be used in which the improved soil mix test is not conducted.

[0062] In this embodiment, the soil discharge type deep mixer 1 is provided with two rotating rods 11 and a large diameter mixing blade 12 with a mixing diameter of 1600 mm or more is used, but this is not limited to this, and a mixing blade with a mixing diameter of, for example, 1000 mm to 1300 mm may be used. For example, in ground where resistance to penetration is expected to be large, it is also possible to use a mixing blade with a mixing diameter of less than 1600 mm as described above.

[0063] In addition, the components in the above-described embodiments can be replaced with well-known components as appropriate without departing from the spirit of the present invention. [Explanation of symbols]

[0064] 1. Soil discharge type deep mixer 11 Rotating Rod 20 Management system (discharge slurry volume management system) 20A Quality Control Department 20B Construction Measurement Section 20C Construction Management Department 20D Calculation Department 21 System measurement panel 22 Construction management equipment 23 Depth and speed detector 24 Rotation detector 25 Current detector 26, 26A, 26B Auxiliary water / slurry flowmeter 27 Computers G. Ground

Claims

1. When the rotating rod provided in the soil discharging type deep mixing processor is penetrated into the improved ground, while mixing the slurry manufactured at the plant into the ground, a discharge slurry amount management system for penetration assisting water construction for managing the improved soil by discharging the penetration assisting water toward the ground when the rotating rod is penetrated, comprising: a quality control unit into which the planned slurry water-cement ratio, planned slurry amount, planned penetration assisting water amount, planned penetration speed, and planned corrected water-cement ratio obtained by combining the planned mixing water and the planned penetration assisting water, which are obtained during the construction planning, are input; a construction measurement unit that measures the actual construction depth, actual penetration speed, and actual penetration assisting water amount during the construction; a construction management unit that obtains the actual corrected water-cement ratio based on the actual construction depth, the actual penetration speed, and the actual penetration assisting water amount measured by the construction measurement unit; a calculation unit that compares the planned corrected water-cement ratio with the actual corrected water-cement ratio during the extraction construction of the rotating rod, and calculates the discharge slurry amount and the extraction speed supplied from the plant so that the actual corrected water-cement ratio matches the planned corrected water-cement ratio; A discharge slurry amount management system for penetration assisting water construction, characterized by comprising the above.

2. The discharge slurry amount management system for penetration assisting water construction according to claim 1, wherein in the calculation unit, when the actual penetration assisting water amount becomes larger than the planned penetration assisting water amount and the actual corrected water-cement ratio becomes larger than the planned corrected water-cement ratio, the discharge slurry amount is calculated so that the actual corrected water-cement ratio becomes the value of the planned corrected water-cement ratio.

3. An earth discharging type deep mixing method for improvement, in which when the rotating rod provided in the earth discharging type deep mixing processor is penetrated into the improved ground, while mixing the slurry manufactured at the plant into the ground, and improving by discharging the penetration assisting water toward the ground when the rotating rod is penetrated, comprising: a step of obtaining the planned slurry water-cement ratio, planned slurry amount, planned penetration assisting water amount, planned penetration speed, and planned corrected water-cement ratio obtained by combining the planned mixing water and the planned penetration assisting water, which are obtained during the construction planning; a step of measuring the actual construction depth, actual penetration speed, and actual penetration assisting water amount during the construction; a step of obtaining the actual corrected water-cement ratio based on the actually measured actual construction depth, actual penetration speed, and actual penetration assisting water amount; In the process of extracting the rotating rod, a step of comparing the planned modified water-cement ratio with the actual modified water-cement ratio and obtaining the discharge slurry amount and extraction speed supplied from the plant so that the actual modified water-cement ratio matches the planned modified water-cement ratio; A soil-excavating deep mixing method characterized by having the above.

4. Before construction, a modified soil mixture test is conducted to test the mixture of the modified soil constructed by a soil-excavating deep mixer. The soil-excavating deep mixing method according to claim 3, characterized in that the planned modified water-cement ratio is obtained in the modified soil mixture test.

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