KR102108110B1 - How to apply optimal blade rotation number for high quality DCM construction - Google Patents

Abstract

The present invention relates to a method for applying, to a deep-mixing-processing method, an optimal blade rotation number (BRN) of a rod used in a deep-mixing-processing apparatus so as to increase construction quality. More specifically, disclosed is a technical field relating to a method for applying an optimal BRN for high-quality DCM construction, which rotates a multi-axis rod penetrated into the ground and drawn therefrom and calculates the BRN of the rod by using the number of mixing blades provided on the rod, the speed at which the rod is penetrated or drawn, and the rotational speed at which the rod is penetrated or drawn to determine the number of mixing blades, the rotational speed during the penetration or drawing, and the penetrating or drawing speed so that the BRN can be applied at a management level or higher, thereby maximizing the construction quality of an underground structure to be constructed.

Description

How to apply optimal blade rotation number for high quality DCM construction}

The present invention relates to a method for applying the optimal rotation number (BRN: Blade Rotation Number) of the rod used in the deep mixing processing equipment to the deep mixing processing method to improve the construction quality of the soft ground improvement, in more detail If it is, rotate the multi-axis rod that is inserted and drawn into the ground of the soft ground, but the number of stirring blades provided on the rod, the speed at which the rod is penetrated or drawn, and the number of revolutions at the time of intrusion or extraction of the rod. By calculating the number of rotations (BRN) of the rod, the number of stirring blades, the number of intrusion or drawing rotations, the intrusion or the extraction speed, so that the number of rotations (BRN) can be applied above the management standard This is a technical field on how to apply optimal rotation speed (BRN) for high-quality DCM construction that can maximize the construction quality of the underground structure.

In particular, the present invention, when constructing an underground structure that is a collection of a plurality of single holes, the number of stirring blades, intrusion or drawing rotation speed, intrusion or drawing speed to be applied within the management standard, the shaft spacing between the rod and the rod and stirring By determining the number of revolutions (BRN) according to the wing diameter including the length of the wings and the applied layer, the optimal number of revolutions (BRN) above the management standard is applied to the in-depth mixing processing method, and the construction of the underground structure is applied to the soft ground. This is a technical field on how to apply optimal rotation speed (BRN) for high-quality DCM construction that can maximize quality.

In general, the Deep Cement Mixing (DCM) method uses the slurry mainly composed of cement and water as the soft ground (viscous soil, sandy soil, organic soil) or the ground with high permeability coefficient (sand gravel layer, weathered soil). It is intended to improve the soft ground by chemically solidifying by mixing with stirring while injecting with a discharge pressure and a constant pressure. In particular, a physically and chemically solidified underground structure (pile) through a hydration reaction that occurs when the soft ground (seawater) and slurry are mixed To be constructed, and to strengthen the soft ground by the above-described underground structure.

This in-depth mixing treatment method was developed and promoted by the Japan Port Authority's Port Research Institute since 1976, and the method using limestone, cement, and other slurry has been put into practical use since the 1970s, and is currently widely used as a method for improving soft ground in Korea. Is being constructed.

The deep mixing treatment method as described above is a process of intrusing a rod into the ground, a process of drawing a rod penetrated to a design depth upward, and a process of mixing with the soft ground while injecting a slurry at the same time as drawing or intrusion of the rod. Is done.

At this time, the deep mixing process as described above, as shown in Figures 1 and 2, the leader (11,21) is installed in the vertical direction, and the intrusion into the ground while ascending and descending along the leader (11,21) and It is installed on the lower part of the rods 13, 23 and the rods 13, 23 provided with an inlet passage so that the slurry can be moved to the ground by being pulled but rotated by the drive motors 12, 22 formed on the upper portion. In-depth mixing processing equipment consisting of a stirring part injected into the ground is used.

However, the conventional deep mixing treatment method does not take into account the characteristics of the soft ground, but the stirring casing having a uniform rotational speed, that is, the stirring part is installed at the bottom of the rod to perform the intrusion and drawing process, but the initial intrusion process of the soft ground Since the starting load generated in the course does not take into account the overload of friction between the rotating stirring part and the soil that changes depending on the depth of the ground, the driving means must be started to have a uniform number of revolutions at the initial start-up. There is a problem that the efficiency is lowered to provide the cause of the secondary construction.

In addition, the soft ground has a number of geological layers with various soft hardness characteristics depending on the depth of the ground, but the conventional deep mixing treatment method simply performs an intrusion and drawing process using a stirring unit having a uniform rotational speed. In the soft silt or buried layer, the slurry is easily scattered to the surroundings due to the rotational force of the stirring part, as well as providing a cause of deteriorating construction quality due to disturbance of the ground. In addition, in the ground layer with high hardness, the penetration efficiency of the stirring part is limited and uniform. Since it is impossible to construct a continuous underground structure, it has the disadvantage of deteriorating construction quality.

In addition, in the conventional deep mixing treatment method, the slurry was injected only from the lower portion in the process of mixing with the soft ground while injecting the slurry into the ground at the same time as the intrusion or drawing of the rod, and thus, the lower portion of the underground structure during the drawing process, that is, the underground structure. There is a problem that the construction quality is not deteriorated because stirring of the tip of the end is not sufficiently performed, and a technique for injecting a slurry from the upper and lower portions of the stirring unit has been developed to solve the problem.

In addition, the conventional deep mixing treatment method improves the construction quality by injecting the slurry from the upper and lower portions of the stirring portion and the softness characteristics of the soft ground as described above, but the number of stirring blades and the stirring portion provided in the stirring portion. By simply adjusting the number of revolutions in consideration of the softness of the soft ground without considering the penetration and extraction speed of the stirring section and the speed of penetration of the stirring section, there is a problem that the construction quality is deteriorated due to insufficient stirring of the slurry. Did.

In particular, in the conventional deep mixing treatment method, when constructing an underground structure consisting of a collection of single holes, the distance between the rods made of multiple axes is not taken into consideration, so that the stirring efficiency is reduced as well as the diameter of the rod including the stirring blades, that is, The diameter of the stirring part including the length of the stirring blade is also not considered, and the stirring efficiency is increased only by the uniform rotational speed or the soft hardness of the soft ground and the method of injecting the upper and lower slurries. There is a need for a method for applying the optimum rotational speed (BRN) beyond the management standard in consideration of the blade diameter of the stirring portion including the interval and the length of the stirring blade.

Republic of Korea Registered Patent No. 0820844 (2008.04.02)

The present invention is a technique devised to solve the problems according to the above-described prior art, and uses a stirring blade number, an intrusion or drawing rotation speed, an intrusion or drawing speed, and a rotation speed exceeding a management standard (BRN: Blade Rotation Number, below) It is referred to as 'BRN'.) In addition to calculating and applying it, the optimal rotational speed (BRN) is applied by considering the rods made of multi-axes, that is, the axial spacing between the stirring parts and the blade diameter including the length of the rod and the stirring blades. By doing so, the main purpose is to provide through a method of applying the optimum rotational speed (BRN) for high-quality DCM construction that can improve the construction quality of the deep mixing treatment method.

The present invention is to be installed on the ground or offshore dedicated equipment to realize the purpose of the scavenging as described above, and is installed on the lower part of the rod and a plurality of rods which are rotated and penetrated or drawn into the ground, and are provided with a plurality of stirring wings, the lower part In the method for applying the rotational speed (BRN) for agitation of the slurry of the deep mixing treatment method using a deep mixing processing equipment comprising a stirring portion in which a lower inlet and an upper inlet are respectively formed on the outer periphery and the upper outer periphery, We propose the optimal rotation speed application method for high-quality DCM construction, which is characterized by applying the BRN to the deep mixing processing method by calculating the following calculation formula.

[formula]

BRN (T) = ΣM × ｛(N1 ÷ V1) + (N2 ÷ V2)｝

ΣM: Number of stirring blades

N1: Intrusion speed

V1: Intrusion speed

N2: The number of drawing revolutions

V2: Drawing speed

In addition, the present invention is characterized in that when constructing a single column, the slurry is injected through the lower injection port during the intrusion process, and the injection of the slurry is blocked during the drawing process, and the slurry injection is blocked between the intrusion process and the drawing process. Characterized in that the stirring with a stirring portion.

In addition, the present invention, when constructing the jangju, the first drawing process after the first intrusion process to the position of the upper inlet, and then injecting the slurry through the lower inlet during the second intrusion process, the upper inlet during the second drawing process Characterized in that the slurry is injected through the third drawing process and the third drawing process, and the third drawing process and the third drawing process are performed in a state in which the injection of the slurry from the ground surface is blocked after the second drawing process. It is characterized by stirring with a stirring unit in a state in which slurry injection is blocked between processes.

In addition, the BRN of the present invention is characterized in that it rises in proportion to the inter-axial spacing between the rods, and increases in proportion to the blade diameter including the length of the rod and the stirring blade.

In addition, in the BRN of the present invention, when the interaxial spacing between the rods is 900 to 1000 mm, and the wing diameters including the lengths of the rods and the stirring blades are 1000 to 1200 mm, when the applied layer is the upper 1 to 2 m layer, it is 400 or more. , It is characterized in that the applied layer is 350 or more when it is in the middle and 400 or more when the applied layer is 1-5 m in the lower layer.

In addition, the BRN of the present invention has an interaxial spacing between rods of 1000 to 1100 mm, and a blade diameter of 1200 to 1400 mm, including the length of the rod and the stirring blade, is 500 or more when the applied layer is the upper 1 to 2 m layer. , It is characterized in that the applied layer is 400 or more when it is in the middle, and 500 or more when the applied layer is 1-5 m in the lower layer.

In addition, when the BRN of the present invention has an interaxial spacing between rods of 1100 to 1200 mm, and a wing diameter of 1200 to 1600 mm including the length of the rod and the stirring blade, when the applied layer is the upper 1 to 2 m layer, it is 600 or more. , It is characterized in that the applied layer is more than 400 when it is in the middle, and more than 600 when the applied layer is 1-5 m in the lower layer.

The optimum rotational speed (BRN) application method for high-quality DCM construction according to the present invention as presented above is an intrusive and drawn rod, that is, the number of stirring blades of the stirring unit installed at the bottom of the rod, and the number of intrusion or drawing revolutions of the stirring unit. And by applying the optimum rotational speed (BRN) in the depth mixing process using the intrusion or drawing speed of the stirring portion, it is possible to obtain an effect that can improve the construction quality of the soft ground improvement.

In addition, the present invention calculates the number of rotations (BRN) in consideration of the blade diameter between the rods of the multi-axis, that is, the inter-axial spacing between the rods and the stirring portions including the rotary blades, and the length of the rods and the stirring blades including the length of the stirring blades. By applying to the construction method, an effect capable of further improving the construction quality of the soft ground improvement can be obtained.

In addition, the present invention is an in-depth mixing treatment method, which is optimal for efficient stirring at the bottom of the underground structure, that is, at the top of the tip and the underground structure, that is, during the construction of a long column that serves as a support pillar as well as a single column construction acting as a plate. By applying the number of revolutions (BRN) of can obtain the effect to maximize the construction quality.

1 is a side view showing a general in-ground deep mixing processing equipment.
Figure 2 is a side view showing a general deep sea mixing processing equipment.
Figure 3 is a cross-sectional view showing a long, short column construction according to a preferred embodiment of the present invention.
Figure 4 is a plan view showing the installation of the stirring unit according to a preferred embodiment of the present invention.
Figure 5 is a front view showing the installation of the stirring unit according to a preferred embodiment of the present invention.
6 is a graph showing a single column construction in accordance with a preferred embodiment of the present invention.
7 is a graph showing a short-term construction on land according to a preferred embodiment of the present invention.
Figure 8 is a graph showing the maritime construction of the sea according to a preferred embodiment of the present invention.
9 is a graph showing the construction of a long-term land according to a preferred embodiment of the present invention.

The present invention relates to a method for applying the optimal rotation number (BRN: Blade Rotation Number) of the rod 100 used in the deep mixing processing equipment to improve the construction quality in the depth mixing processing method, in more detail , It is installed in the lower portion of the rod 100 that is penetrated and drawn into the ground, and is applied to a deep mixing treatment method using a deep mixing processing equipment comprising a stirring unit 200 having a plurality of stirring blades 210. By using the number of stirring blades 210 and the number of intrusion or drawing revolutions of the stirring unit 200 and the intrusion or drawing speed of the stirring unit 200, the optimum rotational speed is calculated and applied to the slurry. This is a technique for applying the optimal rotational speed for high-quality DCM construction, which can improve the construction quality by increasing the stirring efficiency of.

In particular, the present invention, when constructing an underground structure that is a collection of a plurality of single holes, the number of stirring blades, intrusion or drawing rotation speed, intrusion or drawing speed, as well as between the rod 100, that is, the shaft spacing between the stirring unit 200 and By increasing the BRN in proportion to the wing diameter of the stirring unit 200 including the length of the stirring blade 210, the stirring efficiency of the slurry can be increased, and accordingly, the BRN above the management standard is applied to the depth mixing processing method. It is characterized by further increasing the stirring efficiency of the slurry to maximize the construction quality.

The configuration for achieving the present invention as described above is installed on the ground or offshore equipment and rotates and is installed on the lower part of the rod 100 and the plurality of rods 100 that are penetrated or drawn into the ground, and a plurality of stirring wings ( 210) is provided, the lower outer peripheral edge and the upper outer peripheral edge of the in-depth mixing processing method using a deep mixing processing equipment comprising a stirring unit 200, the lower inlet 230 and the upper inlet 220 is formed, respectively In the method for applying the rotational speed (BRN) for stirring the slurry, it is characterized in that the BRN is calculated by the following calculation formula and applied to the depth mixing method.

[formula]

BRN (T) = ΣM × ｛(N1 ÷ V1) + (N2 ÷ V2)｝

ΣM: Number of stirring blades

N1: Intrusion speed

V1: Intrusion speed

N2: The number of drawing revolutions

V2: Drawing speed

In addition, the present invention, when performing a single column 300, the slurry is injected through the lower injection port 230 during the intrusion process, blocking the injection of the slurry during the drawing process, calculated by the above formula for the intrusion process and the drawing process It characterized in that each of the BRN is applied to the in-depth mixing treatment method, and after the intrusion process, the injection of the slurry is blocked, and the BRN calculated by the calculation formula during the intrusion process is applied and stirred for 2 minutes.

In addition, the present invention, when the construction of the jangju 400, after the first intrusion process, the first drawing process as much as the position of the upper inlet 220, and then injecting the slurry through the lower inlet 230 during the second intrusion process , Injecting the slurry through the upper injection port 220 during the second drawing process, characterized in that each BRN calculated by the calculation formula during the second and second drawing processes is applied to the depth mixing process, After the second drawing process, a third intrusion process and a third drawing process are performed in a state where the injection of the slurry from the ground surface is blocked, and the BRN calculated by the above calculation formula is deeply mixed during the third and third drawing processes. It is characterized in that it is applied to the treatment method, and after the second intrusion process, the injection of the slurry is blocked and the BRN calculated by the above formula is applied to the deep mixing treatment method and stirred for 2 minutes. .

In addition, the BRN of the present invention is characterized in that it is proportionally raised according to the inter-axial spacing between the rods 100, and proportionally raised according to the wing diameter including the length of the rod 100 and the stirring blade 210.

In addition, in the BRN of the present invention, when the interaxial spacing between the rods 100 is 900 to 1000 mm, and the wing diameters including the lengths of the rods 100 and the stirring blades 210 are 1000 to 1200 mm, the applied layer is It is characterized by 400 or more when the upper 1 ~ 2m layer, 350 or higher when the applied layer is the middle layer, and 400 or higher when the applied layer is the lower 1 ~ 5m layer.

In addition, in the BRN of the present invention, when the interaxial spacing between the rods 100 is 1000 to 1100 mm, and the blade diameters including the lengths of the rods 100 and the stirring blades 210 are 1200 to 1400 mm, the applied layer is It is characterized by 500 or more when the upper 1 ~ 2m layer, 400 or higher when the applied layer is the middle layer, and 500 or higher when the applied layer is the lower 1 ~ 5m layer.

In addition, in the BRN of the present invention, when the inter-axial spacing between the rods 100 is 1100 to 1200 mm, and the wing diameters including the lengths of the rods 100 and the stirring blades 210 are 1200 to 1600 mm, the applied layer is It is characterized by more than 600 when the upper 1 ~ 2m layer, 400 or higher when the applied layer is the middle, and 600 or higher when the applied layer is the lower 1 ~ 5m layer.

Hereinafter, the present invention will be described in detail with reference to FIGS. 1 to 9 showing an embodiment of the present invention.

First, the in-depth mixing processing equipment applied to the present invention is a multi-axis rod for constructing an underground structure by mixing soft underground soil and injected slurry while intruding and drawing along a leader installed vertically on land or marine equipment. 100), a driving motor for rotating the rod 100 and a lower portion of the rod 100, provided with a plurality of stirring blades 210, the lower inlet and the lower outer periphery, respectively 230) and the upper injection port 220 is formed, characterized in that it comprises a stirring unit to inject the slurry into the ground.

That is, the deep mixing processing method to which the BRN of the present invention is applied is constructed using the deep mixing processing equipment as described above, forms an underground structure that is an aggregate of single holes, and has a deep support column, a long columnar 400 Construction of the short column 300 that serves as a plate, but the number of stirring blades of the stirring unit 200 described later, the number of intrusion or drawing rotations of the stirring unit 200, the penetration of the stirring unit 200, or It is characterized in that it is possible to improve the construction quality by applying an optimal rotational speed by calculating and applying a BRN using a drawing speed.

In addition, in the deep mixing treatment method to which the BRN of the present invention is applied, when a single column 300 is installed, the slurry is injected through the lower injection port 230 at the same time as intrusion, and by blocking the injection of the slurry during drawing, the construction quality It is characterized in that it can be made to improve the.

In addition, in the deep mixing treatment method to which the BRN of the present invention is applied, when a long column 400 is constructed, after intrusion, it is drawn again as much as the upper inlet port 220, and then the slurry is injected through the lower inlet port 230, and lowered during drawing. By injecting the slurry through the upper inlet 220 while the inlet 230 is blocked, it is characterized in that it is possible to improve the construction quality of the tip of the underground structure, that is, the lower portion.

At this time, the deep mixing treatment method to which the BRN of the present invention is applied is applied by drawing once again in a state in which the injection of the slurry from the base plate is blocked, and then drawn out by drawing the slurry of the coffee beans more efficiently during the construction of the long column 400. It is characterized by being able to improve the construction quality of the head of the structure, that is, the upper part.

That is, the present invention applies the optimum rotational speed (BRN) to the depth mixing process using a deep mixing processing equipment having a stirring part 200 having an upper injection port 220 and a lower injection port 230 to improve stirring efficiency. By increasing, the construction quality is improved, and in particular BRN according to the blade diameter of the stirring unit 200 including the length of the stirring blade 210 and the inter-axial spacing of the rod 100, that is, the stirring unit 200 made of multiple axes. By proportionally increasing the BRN above the management standard, that is, by applying the optimal rotation speed, it is characterized in that the construction quality can be maximized.

The rotational speed (BRN) referred to in the present invention corresponds to the total rotational speed of the rod 100 per m, that is, the stirring unit 200, and it is clear that the stirring efficiency of the slurry is determined by the rotational speed (BRN). something to do.

In addition, the number of stirring blades referred to in the present invention means the total number of the plurality of stirring blades 210 provided on the upper and lower parts of the outer periphery of the stirring unit 200, and the number of intrusion or drawing rotations is the stirring unit 200 It means the RPM per m of the stirring part 200 which is initially set at the time of intrusion or drawing into the soft ground (not applicable to seawater in the case of sea), and the intrusion or drawing speed is 100 loads per m, that is, It means the speed at which the stirring unit 200 descends or rises.

In addition, the jangju 400 referred to in the present invention is an underground structure generally constructed mainly in the deep mixing treatment method, and refers to an underground structure having a deep depth, and the short column 300 is generally a jangju (400) in the deep mixing treatment method. ) After construction means an underground structure having a depth lower than that of the long column 400 for strengthening the surface layer.

As a result, the present invention allows the total number of revolutions per m of the rod 100 used in the depth mixing process to be maintained above the management standard by using the number of stirring blades, the number of intrusion or drawing revolutions, and the intrusion or drawing speed. By increasing the agitation efficiency, it is intended to improve the construction quality, which is characterized in that it can be installed while maintaining an optimized BRN by adjusting any one or more of the intrusion or drawing rotation speed, intrusion or drawing speed.

In particular, the present invention by increasing the BRN in proportion to the diameter included up to the length of the rod 100 made of a multi-axis, that is, the stirring portion 200 and the length of the stirring blade 210, the spacing of the stirring portion 200 It is possible to prevent the stirring efficiency from being lowered by the length of the stirring blade 210, thereby obtaining an effect of maximizing the stirring efficiency.

In connection with the above, the BRN of the present invention is calculated by the following calculation formula and applied at the time of intrusion or drawing of the deep mixing treatment method.

[formula]

BRN (T) = ΣM × ｛(N1 ÷ V1) + (N2 ÷ V2)｝

ΣM: Number of stirring blades

N1: Intrusion speed

V1: Intrusion speed

N2: The number of drawing revolutions

V2: Drawing speed

When the calculation formula is specifically described, the BRN of the present invention is proportional to the number of stirring blades and the number of intrusion or drawing revolutions, and increases or decreases in inverse proportion by the intrusion or drawing speed, which increases the number of stirring blades and increases the number of rotations (BRN). , The number of revolutions (BRN) increases as the number of intrusion or extraction speeds increases, and as the intrusion or extraction speed increases, the agitation of the slurry contained per m decreases at one point, that is, the number of revolutions (BRN) decreases.

In addition, since the number of stirring blades is determined by the number of stirring blades 210 installed in the stirring unit 200, the number of stirring blades is not changed and is applied to the calculation formula. It is applied to the calculation formula, and the intrusion or extraction speed is applied to the calculation formula as an input value initially set, such as the intrusion or extraction rotation speed.

In addition, the application method of the present invention, when performing a single column 300, as shown in Figures 6 and 7, injecting the slurry through the lower injection port 230 in the state in which the upper injection port 220 is closed during the intrusion process In the drawing process, the lower injection port 230 is closed to block the injection of the slurry, and the BRN calculated by the above-mentioned calculation formula is applied to the depth mixing process during the drawing process and drawing process. At this time, it will be apparent that each of the calculated BRNs is calculated to be maintained above the management standard.

In addition, in the application method of the present invention, when the single column 300 is installed, the injection of the slurry after the intrusion process is blocked, and the intrusion process, that is, the calculated BRN during intrusion, is maintained without intrusion or drawing for 2 minutes. It is characterized by agitating the slurry more efficiently by rotating it to be possible.

In addition, the construction of the single column 300 as described above increases the stirring efficiency by maintaining the sum of the number of rotations (BRN) of 600 or more during the intrusion process and the drawing process when the BRN of the management standard is 600, for example. It is possible to improve the construction quality.

On the other hand, the application method of the present invention, when the construction of the jangju 400, as shown in Figures 8 and 9, the first intrusion process, that is, through the first penetration process to the design depth through the design of the stirring unit 200 The first drawing process is carried out as much as the position of the upper inlet 220, and then the slurry is injected through the lower inlet 230 in the state where the upper inlet 220 is closed during the second intrusion process, that is, the lower end of the underground structure, that is, the lower part. It is characterized in that the slurry is stirred efficiently, but in the second intrusion process, that is, in the intrusion injection, BRN calculated by the above-mentioned calculation formula is applied to the deep mixing treatment method.

In addition, the application method of the present invention, when the construction of the long column 400, as in the construction of the short column 300, the second injection process after the second intrusion process in a state in which the injection of the slurry is blocked for 2 minutes without intrusion or drawing Intrusion process, that is, by rotating the slurry so that the calculated BRN can be maintained more efficiently during intrusion, it is characterized by stably solidifying the tip of the underground structure, that is, the lower portion.

In addition, the application method of the present invention, when the construction of the jangju 400, stirred for 2 minutes after the second intrusion process, the slurry through the upper inlet 220 in the state of closing the lower inlet 230 during the second drawing process By injecting, the leading end of the underground structure, that is, the slurry injected at the bottom and the slurry injected during drawing have continuity, so that the middle part of the underground structure is continuously formed. By applying the calculated BRN to the in-depth mixing treatment method calculated by the calculated formula, the agitation efficiency is increased to realize the effect of improving the construction quality.

In addition, in the application method of the present invention, the third intrusion process and the third intrusion process in a state in which the injection of the slurry is blocked by closing the upper inlet port 220 on the ground surface after the second extraction process when the long column 400 is constructed. This is done, and in the third intrusion process and the third drawing process, each BRN calculated by the above-mentioned calculation formula is applied to the in-depth mixing process, so that the solidification of the ground layer, that is, the surface layer, which is the upper part of the underground structure, is stable and By making it solid, it is possible to realize the effect of not only increasing the stirring efficiency, but also improving the maximized construction quality.

In addition, in the application method of the present invention, the efficiency in which the soft ground is agitated with the slurry according to the depth is different, and in order to induce solidification of the underground structure through sufficient agitation, the position of the soft ground, that is, the applied ground layer to form a high-strength underground structure Accordingly, by maintaining the rotational speed (BRN) above the management standard, it is possible to realize an effect of forming an underground structure with improved construction quality.

Specifically, the BRN of the present invention, as shown in Table 1 below, the interaxial spacing between the rods 100 is 900 to 1000 mm, and the wing diameters including the lengths of the rods 100 and the stirring blades 210 are 1000 to 1200. In the case of ㎜, it is characterized in that the applied layer is 400 or more when the upper 1 ~ 2m layer, 350 or more when the applied layer is the middle part, and 400 or more when the applied layer is the lower 1 ~ 5m layer, and the shaft spacing between the rods 100 If this is 1000 to 1100 mm, and the wing diameter including the length of the rod 100 and the stirring blade 210 is 1200 to 1400 mm, when the applied layer is the upper 1 to 2 m layer, it is 500 or more, and the applied layer is the middle part When it is 400 or more, and when the applied layer is the lower 1 ~ 5m layer, it is characterized in that it is 500 or more, and the shaft spacing between the rods 100 is 1100 ~ 1200 mm, including the length of the rod 100 and the stirring blade 210. When the wing diameter is 1200 ~ 1600㎜, it is more than 600 when the applied layer is the upper 1 ~ 2m layer, and more than 400 when the applied layer is the middle part. Characterized in that the resin layer is not less than 600 when the lower layer 1 ~ 5m.

NO Interval
(mm) Wing diameter
(mm) Applied strata Designed revolutions per m
(BRN) Remark One 900 ~ 1000  1000 ~ 1200 Upper part (1 ~ 2m) 400 or more Middle part More than 350  Lower part (1-5m) 400 or more 2 1000 ~ 1100  1200 ~ 1400 Upper part (1 ~ 2m) 500 or more Middle part 400 or more  Lower part (1-5m) 500 or more 3 1100 ~ 1200  1200 ~ 1600 Upper part (1 ~ 2m) More than 600 Middle part 400 or more  Lower part (1 ~ 5m) More than 600

As a result, the optimal rotational speed application method for high-quality DCM construction of the present invention is the optimum rotational speed (BRN) due to the above-mentioned calculation formula using the number of stirring blades, intrusion or extraction rotational speed, intrusion or extraction speed, and deep mixing In addition to being applied to the processing method, taking into account the spacing between the rods 100, that is, the axial spacing between the stirring units 200, the blade diameter including the lengths of the rods 100 and the stirring blades 210 and the position of the applied layer The optimum rotational speed (BRN) can be applied to maximize the stirring efficiency to obtain the effect of promoting the formation of an underground structure with excellent construction quality with improved soft ground.

The above has been described with reference to the preferred embodiment of the present invention, and is not limited to the above embodiment, and the person having ordinary knowledge in the technical field to which the present invention belongs through the above embodiment does not depart from the gist of the present invention It can be implemented with various changes in.

100: load
200: stirring unit
210: stirring wing
220: upper inlet
230: lower inlet
300: Danju
400: Jangju

Claims (10)

It is installed on the ground or offshore equipment and rotates and is installed on the lower part of the rod 100 and the plurality of rods 100 that are penetrated or drawn into the ground, and provided with a plurality of stirring blades 210, the lower outer periphery and the upper part. The rotational speed (BRN) for slurry agitation of the deep mixing treatment method using the deep mixing processing equipment, which includes a stirring part 200 in which the lower injection port 230 and the upper injection port 220 are formed on the outer periphery, respectively, is applied. In the method for
Calculate the BRN by the following calculation formula and apply it to the deep mixing process,
When constructing Danju (300),
Slurry is injected through the lower injection port 230 during the intrusion process, and the slurry is blocked during the drawing process,
Stirring with the stirring unit 200 in a state in which slurry injection is blocked between the intrusion process and the drawing process,
The BRN is
Optimal rotational speed for high-quality DCM construction (BRN), characterized in that it rises in proportion to the inter-axial spacing between the rods 100 and increases in proportion to the wing diameter including the length of the rods 100 and the stirring blades 210 Method of application.
[formula]
BRN (T) = ΣM × ｛(N1 ÷ V1) + (N2 ÷ V2)｝
ΣM: Number of stirring blades
N1: Intrusion speed
V1: Intrusion speed
N2: The number of drawing revolutions
V2: Drawing speed
delete delete It is installed on the ground or offshore equipment and rotates and is installed on the lower part of the rod 100 and the plurality of rods 100 that are penetrated or drawn into the ground, and provided with a plurality of stirring blades 210, the lower outer periphery and the upper part. The rotational speed (BRN) for slurry agitation of the deep mixing treatment method using the deep mixing processing equipment, which includes a stirring part 200 in which the lower injection port 230 and the upper injection port 220 are formed on the outer periphery, respectively, is applied. In the method for
Calculate the BRN by the following calculation formula and apply it to the deep mixing process,
When constructing Jangju 400,
After the first intrusion process, the first drawing process is performed to the position of the upper inlet 220, and then the slurry is injected through the lower inlet 230 during the second intrusion process, and the slurry through the upper inlet 220 during the second intrusion process. And inject
After the second drawing process, a third intrusion process and a third drawing process are performed in a state where the injection of slurry from the ground surface is blocked.
While the slurry injection is blocked between the third intrusion process and the third draw process, the mixture is stirred with the stirring unit 200,
The BRN is
Optimal number of revolutions for high-quality DCM construction (BRN), characterized in that it rises in proportion to the inter-axle spacing between the rods 100 and increases in proportion to the blade diameter including the length of the rods 100 and the stirring blades 210. Method of application.
[formula]
BRN (T) = ΣM × ｛(N1 ÷ V1) + (N2 ÷ V2)｝
ΣM: Number of stirring blades
N1: Intrusion speed
V1: Intrusion speed
N2: The number of drawing revolutions
V2: Drawing speed
delete delete delete The method of claim 1 or 4,
The BRN is
When the shaft spacing between the rods 100 is 900 to 1000 mm, and the blade diameters including the lengths of the rods 100 and the stirring blades 210 are 1000 to 1200 mm,
When the applied layer is the upper 1 ~ 2m layer, it is more than 400,
When the applied layer is in the middle, it is more than 350,
Optimal rotation speed (BRN) application method for high-quality DCM construction, characterized in that the applied layer is 400 or more when the lower 1 ~ 5m layer is located.
The method of claim 1 or 4,
The BRN is
When the shaft spacing between the rods 100 is 1000 to 1100 mm, and the wing diameters including the lengths of the rods 100 and the stirring blades 210 are 1200 to 1400 mm,
When the applied layer is the upper 1 ~ 2m layer, it is more than 500,
When the applied layer is the middle part, it is more than 400,
Optimal rotational speed (BRN) application method for high-quality DCM construction, characterized in that the applied layer is 500 or more when the lower 1 ~ 5m layer.
The method of claim 1 or 4,
The BRN is
When the shaft spacing between the rods 100 is 1100 to 1200 mm, and the blade diameters including the lengths of the rods 100 and the stirring blades 210 are 1200 to 1600 mm,
When the applied layer is the upper 1 ~ 2m layer, it is over 600,
When the applied layer is the middle part, it is more than 400,
Optimal rotational speed (BRN) application method for high-quality DCM construction, characterized in that the applied layer is more than 600 when the lower 1 ~ 5m layer.

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