JP2023040533A - Discharged slurry amount management system for penetration auxiliary water construction, and soil removal type deep layer mixing method - Google Patents

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 The present invention relates to a discharge slurry amount management system for intrusion auxiliary water construction and a soil removal type deep mixing treatment method.

Conventionally, in the ground improvement method in urban areas, there are many cases of close construction, and there is a demand for a displacement reduction type construction method that suppresses the displacement of the surrounding ground. is known.
In Patent Document 1, when penetrating the two rotating shafts, the amount of soil corresponding to the supply amount of the solidifying material is positively discharged, and then the solidifying material is supplied to the ground that has penetrated when the rotating shaft is pulled out. This is a displacement-reducing ground improvement method that prevents ground expansion due to the supply of solidifying material and avoids displacement of the surrounding ground by stirring and mixing. In this case, since no solidifying material is supplied at the time of penetration, the original ground is discharged without being mixed with the solidifying material.

Furthermore, there are cases where a biaxial ground improvement method is implemented that enables large-diameter improvement by increasing the improvement area with a large-diameter stirring blade, and in this case, there is an advantage that construction costs can be reduced. When performing penetration work with a large-diameter impeller, the penetration resistance increased, so the penetration speed decreased and the work efficiency tended to decrease. Therefore, in Patent Document 2, during penetration, for example, water is discharged from the lower discharge port to promote fluidization, thereby reducing the penetration resistance and ensuring the construction speed, and at the time of withdrawal, slurry is discharged from the upper discharge port. It is also practiced to create an improved product by stirring and mixing.

In recent years, there are cases in the implementation work that exceed the ground resistance at the time of planning and require a larger amount of intrusion supplementary water to be discharged than at the time of planning. It tends to be necessary to calculate the slurry amount of the solidifying material immediately and accurately.

Japanese Patent No. 4885325

However, it is difficult to quantitatively grasp the ground resistance at the time of penetration in advance. It was necessary to set the combination of amounts according to the water-cement ratio of the blending test. In addition, it is necessary for the operator to make an immediate judgment on the amount of auxiliary water for intrusion that exceeds the planned amount of auxiliary water for intrusion, and there are problems in terms of accuracy and difficulty in managing the amount of slurry.

In addition, in the standard equipment management system, the penetration speed and penetration supplementary water amount at the construction depth at the time of penetration are only displayed on the display, and you can check the record as a construction record when the extraction is completed and construction is completed. could only output For this reason, manually record the penetration speed and the amount of penetration supplementary water supplied from the plant (liters/minute) when the penetration auxiliary water exceeds the planned value. It was necessary to adjust the amount of slurry supplied and the drawing speed, and there was a problem with accuracy. It was also thought that it would be difficult to deal with when it became necessary to adjust at multiple depths.

The present invention has been made in view of the above-mentioned problems, and it is possible to perform improved soil mixing treatment in which the amount of slurry discharged into the ground during pulling work is accurately controlled with respect to the amount of intrusion auxiliary water. It is an object of the present invention to provide a discharge slurry amount management system for penetrating auxiliary water construction and a soil removal type deep mixing treatment method that can rationally express the strength at the time of mixing planning.

In order to achieve the above object, a discharge slurry amount management system for penetrating auxiliary water construction according to the present invention is a slurry produced in a plant when penetrating a rotating rod provided in a soil removal type deep mixing treatment machine into improved ground. A discharge slurry amount management system for penetration auxiliary water construction that manages improved soil by mixing it with the ground and discharging the penetration auxiliary water toward the ground when the rotating rod penetrates, and is a planned slurry obtained at the time of construction planning. The quality control department where the water-cement ratio, planned slurry volume, planned intrusion auxiliary water quantity, planned intrusion speed, and planned modified water-cement ratio that combines planned mixed water and planned intrusion auxiliary water are input, and during construction, the execution work A construction measurement unit that measures the depth, actual penetration speed, and actual penetration auxiliary water amount, and the actual modified water cement based on the actual construction depth, the actual penetration speed, and the actual penetration auxiliary water amount measured by the construction measurement unit. a construction management unit that obtains the ratio; and a calculation unit that compares the planned corrected water-cement ratio and the actual corrected water-cement ratio to calculate the actual amount of slurry to be supplied and the drawing speed during the drawing operation of the rotating rod. , is provided.

Further, in the soil removal type deep mixing treatment method according to the present invention, when the rotating rod provided in the soil removal type deep mixing treatment machine is penetrated into the improved ground, the slurry produced in the plant is mixed into the ground, and the rotation A soil discharge type deep mixing treatment method that is improved by discharging penetration auxiliary water toward the ground when the rod penetrates, the planned slurry water cement ratio, planned slurry amount, planned penetration auxiliary water amount, plan A step of determining the penetration speed and the planned corrected water-cement ratio that combines the planned mixed water and the planned penetration auxiliary water, a step of measuring the implementation depth, the actual penetration speed, and the actual penetration auxiliary water amount at the time of construction, and in advance A step of obtaining an actual corrected water-cement ratio based on the measured working depth, the actual penetration speed, and the actual penetration auxiliary water amount, and comparing the planned corrected water-cement ratio and the actual corrected water-cement ratio , and obtaining the actual amount of slurry and the drawing speed during the drawing operation of the rotating rod.

In the present invention, the amount of slurry of the solidifying material to be discharged to the ground is automatically calculated and supplied efficiently by automatically calculating the construction speed at the time of pulling out and the amount of slurry supplied from the plant based on the construction information of the penetration auxiliary water amount measured by the management device. In other words, the planned slurry-to-cement ratio, planned slurry volume, planned intrusion supplementary water volume, and planned Enter the conditions for the intrusion rate and the planned modified water-cement ratio, which is the sum of the planned mixed water and the planned auxiliary water. In the implementation work, the actual corrected water-cement ratio is calculated from the implementation depth, actual penetration speed, and actual penetration supplementary water volume measured and input by the control instrument. When the actual auxiliary water amount is larger than the plan and the actual corrected water-cement ratio is larger than the planned corrected water-cement ratio, the actual slurry amount is calculated so as to be the value of the planned corrected water-cement ratio. The amount of slurry supplied from the plant and the withdrawal speed, which can realize the actual amount of slurry, are displayed to the operator as control values, and the state of the extraction work can be automatically read from the control instrument, checked, judged, and recorded. As a result, in the present invention, it is possible to perform an improved soil mixing process that accurately manages the amount of slurry discharged into the ground during pulling work with respect to the amount of intrusion auxiliary water, and the strength at the time of mixing planning in ground improvement can be rationally achieved. can be expressed.

Further, in the discharge slurry amount management system for intrusion auxiliary water construction according to the present invention, in the calculation unit, the actual intrusion auxiliary water amount is larger than the planned intrusion auxiliary water amount, and the actual corrected water-cement ratio is the planned corrected water If it is larger than the cement ratio, the actual slurry amount may be calculated so that the actual corrected water-cement ratio becomes the value of the planned corrected water-cement ratio.

In addition, in the soil removal type deep mixing treatment method according to the present invention, before construction, an improved soil mixing test for testing the composition of the improved soil applied by the soil removal type deep mixing treatment machine is performed, and in the improved soil mixing test , wherein the planned modified water-cement ratio is determined.

In the present invention, by managing the amount of supplementary water based on the results obtained by the improved soil composition test method when the rotating rod penetrates, it is possible to suppress the displacement of the surrounding ground during ground improvement, and the pulling that realizes strength development. Since the amount of slurry at the time of discharge can be automatically and instantaneously regulated and managed, it is suitable for soil removal type displacement reduction type deep mixing treatment, and the earth removal type biaxial deep mixing treatment method can be effectively adopted.

According to the discharged slurry amount management system for intrusion auxiliary water construction and the soil removal type deep mixing treatment method of the present invention, the amount of slurry discharged into the ground during pulling construction is accurately controlled with respect to the amount of intrusion auxiliary water Mixing improved soil It can be processed, and the strength at the time of mixing planning in ground improvement can be rationally expressed.

(a) to (f) are diagrams showing the steps of the soil removal type deep mixing treatment method according to the first embodiment of the present invention. 1 is a schematic diagram showing the configuration of a management system; FIG. It is a construction management item diagram showing the contents of construction management. FIG. 2 is a flow chart showing the working process of the improved soil mixing test method and the soil removal type deep layer mixing treatment method according to the first embodiment of the present invention. FIG. 10 is a flow chart showing the work steps of the improved soil mixing test method and the soil removal type deep layer mixing treatment method according to the second embodiment of the present invention.

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

(First embodiment)
As shown in FIGS. 1 and 2, the discharge slurry amount management system (hereinafter simply referred to as management system 20) for construction of supplementary water during penetration according to the present embodiment is a rotating rod provided in the soil removal type deep mixing treatment machine 1 When penetrating 11 into the improved ground, the slurry of the solidification material produced in the plant is mixed with the ground G, and the improved soil is managed by discharging penetration auxiliary water toward the ground G when the rotating rod 11 penetrates. It is for
In the soil removal type deep mixing treatment method of the present embodiment, the result (actual slurry amount) obtained by the above-described management system 20 is used to pull out the rotating rod 11 of the soil removal type deep mixing treatment machine 1. It is a construction method that performs deep mixing treatment by sometimes discharging slurry.
Moreover, in the first embodiment, the first improved soil mixing test method for testing the mixing of the improved soil constructed by the soil discharge type deep mixing treatment machine 1 is applied.

As shown in FIGS. 1(a) to 1(f), the soil removal type deep mixing processor 1 includes two rotating rods 11, 11 arranged in parallel with a stirring blade 12 at the tip, and these two shafts spirals 13 provided on the outer peripheral surfaces of the rotating rods 11, 11;

Each rotating rod 11 has an excavating wing 15 at its tip and is independently driven by a dedicated driving motor 16 . The direction of rotation of these rotating rods 11, 11 is the direction in which the spiral 13 is rotated and soil is discharged during penetration and extraction. At the time of extraction, the excavated soil is collected in the center of the two rotating rods 11, 11 and discharged.

The stirring blades 12 are provided in a plurality of stages (four stages in the illustrated example) on the tip end sides of the biaxial rotating rods 11 , 11 . The stirring diameter of the stirring blades 12 provided on each rotating rod 11 can be, for example, 1600 mm.

The solidifying material discharge port 14 is provided in the vicinity of the stirring blade 12 of each of the rotating rods 11 , 11 . Flow paths (not shown) are provided throughout the axial direction inside the rotating rod 11 , and the solidifying material supplied to the upper end of these flow paths flows to the solidifying material discharge port 14 . ing. Specifically, the solidifying material is discharged from the solidifying material discharge port 14 on the lower side when the tip of the improved portion is processed when the rod is inserted, and the solidifying material is discharged from the solidifying material discharge port 14 on the upper side when the rod is pulled out. ing. In the case of the biaxial rotating rods 11, 11 as in the present embodiment, the solidifying material discharge ports 14 on the lower side and the upper side are switched for use.

Next, the management system 20 for intrusion auxiliary water construction will be specifically described with reference to FIGS. 2 and 3. FIG.

The management system 20 mixes the slurry produced in the plant into the ground G when the rotating rod 11 provided in the earth removal type deep mixing treatment machine 1 is penetrated into the improved ground, and the penetration auxiliary water when the rotating rod 11 penetrates It is applied to penetrating auxiliary water construction that manages improved soil by discharging toward the ground G. In the management system 20, the equipment provided on the plant side and the equipment provided on the management room side are connected by wire or wirelessly to the equipment provided on the construction machine side (the soil removal type deep mixing treatment machine 1 side). .

The management system 20 includes a quality control section 20A that manages construction planning, a construction measurement section 20B that manages construction, a construction management section 20C, and a calculation section 20D.

In the quality control section 20A, the planned slurry water-cement ratio obtained at the time of construction planning, the planned slurry amount, the planned intrusion auxiliary water amount, the planned intrusion speed, and the planned modified water-cement ratio obtained by combining the planned mixed water and the planned auxiliary water are input. be done. At the time of penetration construction by the excavation type deep mixing treatment machine 1, penetration slurry is discharged based on the planned corrected water-cement ratio input by the quality control department.

On the construction machine side, a system measurement panel 21 and a construction management device 22 provided at the driver's seat of the soil removal type deep mixing treatment machine 1 are provided. The system measurement panel 21 and the construction management device 22 mutually transmit and receive data D such as measurement data detected by a construction measurement unit 20B, which will be described later.

The system measurement panel 21 aggregates the measurement data detected by the measurement equipment provided as the construction measurement unit 20B. The construction measurement unit 20B is a depth and speed detection that measures the depth (implementation depth) and lifting speed (actual penetration speed) of the tip of the rotating rod 11 that is constructed by the construction machine (earth removal type deep mixing treatment machine 1). a total 23 , 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 . In addition, the construction measuring unit 20B is provided with a device (not shown) such as a flow meter for measuring the intrusion auxiliary water volume when the rotating rod 11 penetrates.

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.
The construction management unit 20C obtains the actual corrected water-cement ratio based on the actual depth of work, the actual intrusion speed, and the actual intrusion auxiliary water amount measured by the construction measurement unit 20B.

The calculation unit 20D compares the planned corrected water-cement ratio obtained by the quality control unit 20A and the actual corrected water-cement ratio obtained by the construction control unit, and calculates the actual amount of slurry during the drawing construction of the rotating rod 11, and A withdrawal speed is calculated. For example, in the calculation unit 20D, when the actual intrusion auxiliary water amount is larger than the planned intrusion auxiliary water amount and the actual corrected water-cement ratio is larger than the planned corrected water-cement ratio, the actual corrected water-cement ratio becomes the planned corrected water-cement ratio. The actual slurry amount can be calculated so as to achieve the ratio value.

In the construction of penetration auxiliary water using the soil removal type deep mixing treatment machine 1, the plant removes the ground from the earth removal type deep mixing treatment machine 1 when pulling out after penetrating the rotating rod 11 of the earth removal type deep mixing treatment machine 1. Prepare slurry to be injected into G.
A pair of auxiliary water/slurry flow meters 26 (26A, 26B) are provided on the plant side. These auxiliary water/slurry flowmeters 26A and 26B detect the flow rates of auxiliary water and slurry. The flow rate values measured by the auxiliary water/slurry flowmeters 26A and 26B are collected in the system measurement panel 21 on the construction machine side and sent to the construction management device 22 .

For example, a computer 27 and a printer 28 for creating daily reports are provided on the management room side. The computer 27 is connected to the construction management device 22 so that data D can be exchanged. Also, the printer 28 outputs the management results and the like created by the computer 27 .

Next, the management items and management contents of the management system 20 will be described more specifically with reference to FIGS. 2 and 3. FIG.
The management system 20 of this embodiment manages the quality of the material, the finished shape of the improved body, and the displacement.

As shown in FIG. 3, with regard to the quality of materials, the slurry materials, slurry blending, and mixing (slurry kneading state) used in penetration auxiliary water construction and produced in the plant are managed.
The content of control of the slurry material is the weighing of the material, which is verified using a weighing machine. The test values of the material tested by the scale are sent to the computer 27 in the form of a digital printed table, for example.
Slurry blending is managed using a penetrating auxiliary water or solidifying material slurry flow meter (auxiliary water/slurry flow meter 26A shown in Figure 2) and a processor lift speed meter (depth/speed detector 23 shown in Figure 2). This is confirmation of the amount of cement per ^1m3 of improved soil detected by
The content of management of the kneading state of the slurry is confirmation of the kneading performance by the shaft rotation meter (rotation detector 24) of the soil removal type deep mixing treatment machine 1 (treatment machine).

The finished shape of the improved body is determined by the placing position, placing depth, and bottoming (bottoming state) by the earth-removing deep-layer mixer 1 . The content of management of the driving position is to confirm the driving position of each treated pile using a surveying instrument such as a total station. The content of management of the driving depth is to confirm the driving depth of each treated pile detected by the processing machine depth gauge (depth/speed detector 23 shown in FIG. 2). The content of the management of the bottoming state is detected by the oil pressure gauge or ammeter (current detector 25 shown in FIG. 2) of the processing machine rotating motor and the processing machine lifting speed meter (depth/speed detector 23 shown in FIG. 2). It is confirmation that the predetermined depth has been reached.

The content of managing the displacement of the improved body is to confirm the amount of discharged soil for each treated pile based on the processing machine tachometer (rotation detector 24 shown in FIG. 2) and the shape of the screw.

In the management system 20, the quality of the material, the finished shape of the improved body, and the displacement, which are the contents of management, are sent to the computer 27 and evaluated for construction. It is created, and if it is inappropriate (=NO), construction to correct it is performed.

Here, the concept of the slurry water-cement ratio managed by the management system 20 will be described below.
The following five formulations were used during construction planning.
Blended cement mass: C _blended (kg)
Blended water mass: W _blended (kg)
Blended water cement ratio: W _blended /C _blended
Planned intrusion supplementary water volume: W _{plan supplement} (kg)
Plan modified water cement ratio: (W _mix + W _{plan auxiliary water} )/C _mix
The following two formulations are used for penetration construction.
Actual intrusion auxiliary water amount: W _{construction auxiliary water} (kg) > W _blend
Actual modified water-cement ratio: (W _mixture + W _{construction auxiliary water} )/C _mixture > (W _mixture + W _{planning auxiliary water} )/C _mixture
The following three formulations are used for drawing construction.
Actual cement mass: C _extraction (kg) > C _mix
Actual water cement ratio: W _extraction /C _extraction = W _mixture /C _mixture
Extraction modified water-cement ratio: (W _extraction + W _{construction auxiliary water} ) / C _extraction = (W _composition + W _{planning auxiliary water} ) / C _composition

Next, the first improved soil mixing test method and the first soil removal type deep mixing treatment method using the management system 20 described above will be specifically described based on the drawings.
The first soil removal type deep mixing treatment method is a plan that combines the planned slurry water cement ratio, planned slurry amount, planned penetration auxiliary water amount, planned penetration speed, and planned mixed water and planned penetration auxiliary water obtained at the time of construction planning. The process of obtaining the corrected water-cement ratio, the process of measuring the working depth, the actual penetration speed, and the actual penetration auxiliary water amount during construction, and the previously measured working depth, the actual penetration speed, and the actual penetration auxiliary water amount. and a step of comparing the planned corrected water-cement ratio and the actual corrected water-cement ratio to determine the actual amount of slurry and the drawing speed during the drawing operation of the rotating rod 11. have.

First, the first improved soil mixing test method will be described with reference to FIG.
In step S1, a prescribed amount of sample soil is mixed with a prescribed auxiliary amount of water discharged toward the ground G when the rotary rod 11 (see FIG. 1) penetrates. After that, the sample soil mixed in step S1 and a predetermined amount of auxiliary water are subjected to primary agitation for 10 minutes (step S2) to prepare a specified amount of water content sample soil (step S3). The time required for the primary stirring at this time is usually about 10 minutes defined by the Japanese Geotechnical Society standard JGS0821-2009.

Next, in step S4, a hardening material is mixed with the specified amount of the water content ratio sample soil prepared in step S3. After that, the water content ratio sample soil and the hardening material of the mixed specified amount are subjected to secondary agitation for 10 minutes (Step S5) to prepare an improved soil specimen (Step S6). The time required for the secondary stirring at this time is usually about 10 minutes as defined by the Japanese Geotechnical Society standard JGS0821-2009.
Steps S1 to S6 up to this point constitute the work flow according to the first modified soil mixing test method.

Next, the first soil removal type deep layer mixing treatment method will be specifically described.
In the first soil removal type deep mixing treatment method, first, in step S7, a strength test is performed on the improved soil specimen prepared by the above-described first improved soil mixing test method to analyze the mixing. That is, the composition of the improved soil test piece prepared in step S7 is changed and the strength test is performed to select the combination of the intrusion auxiliary water amount and the composition.

After that, in step S8, based on the analysis result of the modified soil test piece, the penetrating supplementary water amount at the time of penetrating work of the rotating rod 11 of the earth-discharging-type deep-seating treatment machine 1 shown in FIG. 1 is set. Next, during construction, which will be described later, water is discharged from the solidifying material discharge port 14 provided on the stirring blade 12 shown in FIG. Supplementary water volume) is controlled for each excavation depth.

As a specific construction, first, in the management system 20 shown in FIG. Enter the planned modified water-cement ratio combined with water into the quality control department.

Next, as shown in FIGS. 1(a) and 1(b), after positioning the soil removal type deep mixing treatment machine 1 at a predetermined construction position, the two-axis rotating rods 11 and 11 are rotated to remove the ground G. penetrate into. At that time, the amount of rotation of the rotating rods 11, 11 is appropriately controlled in consideration of the actual intrusion speed, and the soil is discharged by each spiral 13. At this time, water is discharged from the solidifying material discharge port 14 provided in the stirring blade 12 toward the ground G, and the penetration auxiliary water amount (penetration auxiliary water amount set in step S8) for promoting fluidization is adjusted for each excavation depth. Penetrate in a controlled way.

The amount of intrusion auxiliary water discharged for each excavation depth is measured by the auxiliary water/slurry flow meter 26A on the plant side in FIG. 2 and recorded in the construction management device at the same time as the construction. Then, the construction management unit 20C of the construction management device 22 calculates the actual modified water-cement ratio from the previously measured construction depth, actual penetration speed, and actual penetration auxiliary water amount discharged during construction.
Thereafter, the calculation unit 20D compares the planned corrected water-cement ratio with the actual corrected water-cement ratio, calculates the amount of slurry to be discharged at the time of pulling construction so that the actual corrected water-cement ratio matches the time of planning, and is supplied from the plant. The actual slurry amount and the drawing speed are specified and managed as construction control values during the drawing work.

Then, as shown in FIG. 1(c), the penetration is stopped when the tips (excavation blades 15) of the rotating rods 11, 11 reach a predetermined improved bottom depth.

Next, as shown in FIGS. 1(d) and 1(e), the rotating rods 11, 11 are pulled out halfway through the improvement area P. Then, as shown in FIGS. At this time, each rotating rod 11 discharges the solidifying material in the amount of discharge slurry from the solidifying material discharge port 14, and pulls up the rotating rods 11 and 11 and the stirring blade 12 while maintaining the rotation at the time of penetration. The ground improvement of the improvement area P per span is completed (see FIG. 1(f)).
At this time, the withdrawal speed and the amount of slurry sent from the plant are shown in the construction management device 22 in FIG. do.

Then, after the improved body is constructed to the desired depth, as shown in FIG. Based on the intrusion auxiliary water amount obtained by the soil mixing test method, the steps of FIGS.

As described above, in the discharge slurry amount management system and the soil discharge type deep mixing treatment method for intrusion auxiliary water construction according to the present embodiment, improved soil mixing treatment is performed in which the auxiliary water amount discharged to the ground G is accurately controlled. Since it is possible to control the amount of slurry in order to develop the improved strength reliably, it is possible to grasp the correct strength in ground improvement.

(Second embodiment)
Next, a discharge slurry amount management system for auxiliary water construction during penetration and a soil removal type deep mixing treatment method according to the second embodiment will be described based on the flowchart shown in FIG. 5 .
In the second embodiment, the second improved soil mixing test method for testing the mixing of the improved soil constructed by the soil discharge type deep mixing treatment machine 1 is applied. The soil discharge type deep mixing treatment machine 1 (see FIG. 1) for testing the blending of improved soil in this test method is the same as that of the first embodiment described above. Also, the second embodiment will be described with reference to FIGS. 1 to 4 used in the first embodiment.

First, in step S10, a specified amount of sample soil is prepared.
On the other hand, the penetration speed of the rotary rod 11 (see FIG. 1) and the predetermined amount of auxiliary penetration water discharged toward the ground G are set (step S11). After that, the penetration auxiliary water amount to be thrown into the target soil that is agitated at the penetration speed set in step S11 is calculated (step S12). Specifically, the intrusion supplementary water volume per volume of the soil to be improved is calculated. Then, in step S13, the discharged soil amount is calculated by setting the discharged soil rate based on the amount of intrusion supplementary water that is supplied. Further, the amount of cement to be added and the amount of water to be mixed are calculated from the prescribed mixture (water-cement ratio) for the amount of soil to be improved after soil removal (step S14).

After that, in step S15, a corrected water-cement ratio (corrected water-cement ratio) is calculated from the calculated cement addition amount, mixing water amount, and intrusion supplementary water amount. A hardener having a corrected water-cement ratio is mixed with the specified amount of sample soil prepared in step S10 (step S16). Thereafter, the prescribed 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 stirring at this time is usually about 10 minutes as defined by the Japanese Geotechnical Society standard JGS0821-2009.
Steps S10 to S18 up to this point constitute the work flow according to the second improved soil mixing test method.

Next, in the second soil removal type deep mixing treatment method, first, in step S19, a strength test is performed on the improved soil specimen prepared by the above-described second improved soil mixing test method to analyze the mixing. Specifically, the composition of the improved soil test piece prepared in step S19 is changed and a strength test is performed to select a combination of penetration auxiliary water amount and composition.

After that, in step S20, based on the analysis result of the improved soil test piece, a planned intrusion supplementary water amount at the time of penetrating work of the rotary rod 11 of the soil removal type deep mixing treatment machine 1 shown in FIG. 1 is set. Next, at the time of construction, which will be described later, an auxiliary water amount (planned intrusion auxiliary water amount set in step S20) for discharging water from the solidifying material discharge port 14 provided in the stirring blade 12 toward the ground G and promoting fluidization is set. It is constructed by penetrating while controlling each excavation depth.
The specific construction of slurry amount management at the time of drawing based on the actual intrusion auxiliary water amount in the actual construction is the same as in the above-described first embodiment, so detailed description will be omitted here.

In the second embodiment, the test can be performed with the properties of the sample soil as they are at the site. For the hardening material to be mixed, add the penetration supplementary water amount at the time of penetration to the formulation water for the specified formulation, and consider the amount of discharged soil and newly correct the amount of water cement to calculate. By mixing the hardening material mixed with this corrected amount of water cement with the sample soil, an improved soil test piece was created, and based on the analysis results of analyzing the prepared improved soil test piece, the soil discharge type deep mixing treatment machine 1 It is possible to set the amount of auxiliary water when the impeller 12 is penetrated.

As described above, in the second embodiment, it is possible to conduct a mixing test in advance to reflect changes in soil properties (increase in water content, decrease in soil particle content) caused by supplementary water, and control. In particular, in the present embodiment, as described above, since the auxiliary water is discharged when the rotary rod 11 penetrates, the mixed soil with a high water content is discharged, but the auxiliary water amount of the discharged water is reduced to a suitable amount. Because it is managed with high accuracy, displacement of the surrounding ground during ground improvement can be kept small.

In addition, as for the preparation method of the improved soil specimen, it is possible to use the conventional preparation method (Geotechnical Society Standard JGS0821-2009, "Method for preparation of specimen without compaction of stabilized soil"). The test results can be compared and verified with reproducibility, and the test results can be guaranteed.

As described above, the embodiment of the discharge slurry amount management system and the soil removal type deep mixing treatment method for construction of intrusion auxiliary water according to the present invention has been described, but the present invention is not limited to the above embodiment. It can be changed as appropriate without departing from the spirit.

For example, in the above-described embodiment, in the management system 20, when the actual intrusion supplementary water amount is greater than the planned intrusion supplementary water amount and the actual corrected water-cement ratio is larger than the planned corrected water-cement ratio, the calculation unit 20D manages the amount of actual slurry so that the actual corrected water-cement ratio becomes the value of the planned corrected water-cement ratio, but is not limited to such a management method.

Further, in this embodiment, before construction, an improved soil mixing test for testing the mixing of the improved soil applied by the soil discharge type deep mixing treatment machine 1 is performed, and in the improved soil mixing test, the planned corrected water cement ratio Although a method that requires is adopted, a construction method that does not conduct an improved soil mixing test may be used.

Further, in this embodiment, as the soil discharge type deep mixing treatment machine 1, the rotary rod 11 is provided with two shafts, and the stirring blade 12 has a large diameter device with a stirring diameter of 1600 mm or more. , and a stirring diameter of, for example, 1000 mm to 1300 mm may be used. For example, it is possible to adopt the above-mentioned stirring diameter of not more than 1600 mm in the ground which is assumed to have a large resistance at the time of penetration.

In addition, it is possible to appropriately replace the components in the above-described embodiments with well-known components without departing from the scope of the present invention.

1 earth-discharging type deep mixing processor 11 rotating rod 20 management system (dispensed slurry amount management system)
20A Quality Control Department 20B Construction Measurement Department 20C Construction Management Department 20D Calculation Department 21 System measurement panel 22 Construction management device 23 Depth/speed detector 24 Rotation detector 25 Current detector 26, 26A, 26B Auxiliary water/slurry flow meter 27 Computer G Ground

Claims (4)

When the rotating rod provided in the earth-discharging type deep mixing treatment machine is penetrated into the improved ground, the slurry produced in the plant is mixed with the ground, and the penetration auxiliary water is discharged toward the ground when the rotating rod penetrates. A discharge slurry amount management system for intrusion auxiliary water construction that manages improved soil by
A quality control department that inputs the planned slurry water-cement ratio, planned slurry volume, planned intrusion supplementary water quantity, planned intrusion speed, and planned modified water-cement ratio that combines planned mixed water and planned intrusion supplementary water obtained at the time of construction planning; ,
A construction measurement unit that measures the depth of construction, the actual penetration speed, and the amount of auxiliary water for actual penetration during construction,
a construction management unit that obtains an actual modified water-cement ratio based on the actual depth of construction measured by the construction measurement unit, the actual intrusion speed, and the actual intrusion auxiliary water amount;
a calculation unit that compares the planned corrected water-cement ratio and the actual corrected water-cement ratio to calculate the actual amount of slurry and the drawing speed during the drawing operation of the rotating rod;
A discharge slurry amount management system for intrusion auxiliary water construction, characterized by comprising: In the calculation unit, when the actual intrusion auxiliary water amount is larger than the planned intrusion auxiliary water amount and the actual corrected water-cement ratio is larger than the planned corrected water-cement ratio, the actual corrected water-cement ratio is set to the planned 2. The discharge slurry amount management system for penetration auxiliary water construction according to claim 1, wherein the actual slurry amount is calculated so as to have a corrected water-cement ratio value. When the rotating rod provided in the earth-discharging type deep mixing treatment machine is penetrated into the improved ground, the slurry produced in the plant is mixed with the ground, and the penetration auxiliary water is discharged toward the ground when the rotating rod penetrates. A soil removal type deep mixing treatment method improved by
A step of obtaining a planned slurry water-cement ratio obtained at the time of construction planning, a planned slurry amount, a planned intrusion auxiliary water amount, a planned intrusion speed, and a planned modified water-cement ratio that is a combination of the planned mixed water and the planned intrusion auxiliary water;
At the time of construction, a step of measuring the actual depth of work, the actual penetration speed, and the actual penetration supplementary water volume;
a step of obtaining an actual modified water-cement ratio based on the previously measured working depth, the actual intrusion speed, and the actual intrusion auxiliary water amount;
a step of comparing the planned corrected water-cement ratio and the actual corrected water-cement ratio to determine the actual amount of slurry and the drawing speed during the drawing operation of the rotating rod;
A soil removal type deep layer mixing treatment method characterized by having Before construction, an improved soil mix test was conducted to test the mixture of the improved soil to be applied by the soil removal type deep mixing treatment machine.
4. The soil removal type deep mixing treatment method according to claim 3, wherein the planned modified water-cement ratio is obtained in an improved soil mixing test.

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