EP3202982B1 - Ground improving method - Google Patents
Ground improving method Download PDFInfo
- Publication number
- EP3202982B1 EP3202982B1 EP15846895.9A EP15846895A EP3202982B1 EP 3202982 B1 EP3202982 B1 EP 3202982B1 EP 15846895 A EP15846895 A EP 15846895A EP 3202982 B1 EP3202982 B1 EP 3202982B1
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- Prior art keywords
- jet
- cutting fluid
- ground
- nozzle
- jet device
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/66—Mould-pipes or other moulds
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/003—Injection of material
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Description
- The present invention relates to a technology of improving ground which forms an underground consolidated body by cutting a ground to be improved by injecting a cutting fluid thereto, feeding a solidification material, mixing a cut ground, the cutting fluid and the solidification material and agitating a mixture thereof.
- One example of a method for improving ground in prior art (e.g. Patent Document 1) will be described hereinafter with reference to
Fig. 8 . - In
Fig. 8 , a rod-shaped jet device 11 is inserted into a drilling hole HD drilled in a ground G to be improved. Thejet device 11 is provided with inject nozzles N for injecting a cutting fluid jet J to a side face in order to inject a jet flow of a cutting fluid (J: a cutting fluid jet) such as high-pressure water to an underground G. A plurality of inject nozzles N are provided at a point symmetrical with respect to a central axis CL of the jet device 11 (e.g. two inject nozzles shown inFig. 8 ), and positions in a vertical direction of a plurality of the inject nozzles N (positions in upward and downward directions inFigs. 8 and11 ) are the same. - The
jet device 11 is provided with a flow passage for a cutting fluid (a pipe for a cutting fluid: not shown) inside thereof. A cutting fluid is fed from a feed device provided above the ground (not shown) to the flow passage for a cutting fluid in thejet device 11. The cutting fluid is injected as a cutting fluid jet J from the inject nozzles N in an outward radial direction (in a horizontal direction). - In
Fig. 8 , thejet device 11 is slowly pulled up above the ground (in an upward direction inFig. 8 ) by injecting the cutting fluid jet J underground and rotating thejet device 11 in e.g. an arrowed direction R. Accordingly, the ground G is cut by the cutting fluid jet J, and an in-situ soil and the cutting fluid are mixed to form a diameter-expanded cutting hole HC having an inner wall surface W. - Meanwhile, a solidification material (e.g. cement) is delivered from a discharge port (not shown) provided around a lower end portion of the
jet device 11 via a solidification material flow passage (not shown) in thejet device 11. Accordingly, the solidification material is mixed with a cut in-situ soil to form an underground consolidated body (not shown) by delivering the solidification material to said diameter-expanded cutting hole HC. Herein, cases where the solidification material is injected in an outward radial direction like the cutting fluid jet J or together therewith are considered as an example. - When the cutting fluid jet J cuts the ground G, slime is generated as a mixture of the cut in-situ soil and the cutting fluid. The slime, as shown in an arrowed direction AD, is discharged above the ground through a space S (a circular space) between the
jet device 11 and an inner wall surface of the drilling hole HD. -
Fig. 9 shows all flow lines of the cutting fluid jet J when thejet device 11 is pulled up by rotating the same a plurality of times on the same cross section in the ground G cut by the cutting fluid jet J. As shown inFig. 9 , all the flow lines of the cutting fluid jet J are expressed as a plurality of lines L extending parallel to each other at a predetermined interval of P/2 (P is a pitch defined as the amount of pulling up thejet device 11 while it is rotated one time) . InFig. 9 , since the cutting fluid jet J is injected from two nozzles N, the interval of flow lines of the cutting fluid jet J is 1/2 of the pitch P. - In
Fig. 9 , an in-situ soil (ground, bedrock, rock, etc.) found in a plurality of cutting fluid jets J extending parallel to each other at a predetermined interval (1/2 of pitch P) is cut by the jet J, the cut in-situ soil is mixed with a cut fluid and discharged above the ground as slime. - However, since the jet J is not injected to a region between a plurality of the cutting fluid jets J (at an interval of P/2), as shown in
Fig. 10 , a clod M whose representative size is large (the biggest size out of a size in a longitudinal direction, a size in a lateral direction and a size in an elevational direction) is not cut and remains in a region between a plurality of jets J ejected parallel to each other. - If the large clod M is not cut and remains in the ground, as shown in
Fig. 11 , it is difficult for the large clod M to pass a gap S (a circular space) between an inner wall surface of a drilling hole HD and thejet device 11. Accordingly, blocking of the gap S (the circular space) will prevent slime from being discharged above the ground. - Therefore, in the above described method for improving ground, a technology for preventing cutting of a clod M whose representative size is large to remain in the ground is being desired. Unfortunately, such a technology (a technology for preventing cutting of a clod M whose representative size is large to remain in the ground) has not been proposed yet.
- Patent Document 1:
JP-A-7-76821 - Documents
JP 2013 036213 A JP 2001 115442 A JP H10204875A JP H07109726 A JP 2013 036213 A second nozzle 3 are used for injecting hardening material liquid which is equivalent to the solidification material in the claimed invention. InJP 2001 115442 A JP H10204875A JP H07109726 A - Document
GB 2227 037 A - The present invention was made in view of the above situation, and has an object to provide a method for improving ground capable of preventing a clod whose representative size is large from remaining in the ground.
- The method for improving ground of the present invention comprises the steps of: cutting a ground by injecting a cutting fluid (e.g. high-pressure water or high-pressure air: including a case where a solidification material is injected) from jet devices (1, 10); feeding a solidification material; mixing a cut ground (G), the cutting fluid and the solidification material; and agitating a mixture thereof to form an underground consolidated body, wherein a plurality of nozzles (N1, N2) are located at an interval in a vertical direction in the jet devices (1, 10), and when the cutting fluid is injected, a cutting fluid (a cutting fluid jet J1) is injected from an upward nozzle (N1) in a downward skewed direction, and a cutting fluid (a cutting fluid jet J2) is injected from a downward nozzle (N2) in an upward skewed direction.
- The method for improving ground according to the present invention preferably comprises a step of adjusting the angle of the nozzles (N1, N2) (θ: the inject angle of jets J1 and J2) .
- In addition, the method for improving ground of the present invention preferably comprises a step of adjusting the interval V between the nozzles (N1, N2) in a vertical direction.
- In the present invention, it is preferable that a partition forming material (jets J1, J2) is injected from an upward direction of the jet device (10) as a cutting fluid, and a solidification material (jets J3, J4) is injected from a downward direction of the jet device (10).
- The method for improving ground of the present invention comprising the above steps can provide a construction in which a plurality of nozzles (N1, N2) are located at an interval in a vertical direction, a cutting fluid (jet J1) is injected from the upward nozzle (N1) in a downward skewed direction and a cutting fluid (jet J2) is injected from the downward nozzle (N2) in an upward skewed direction. Accordingly, the method for improving ground can provide a shape for flow lines of cutting fluids (jets J1, J2) injected for a certain period of time on a plane at an optional position (
Figs. 2 and9 : a plane containing a central axis CL of ajet device 1 and extending in a radial direction and a vertical direction: found in all directions at 360° degrees with respect to the central axis CL of the jet device 1) so that a plurality of straight lines (J1, J2) parallel to each other extending in a skewed direction intersect each other. - Therefore, even if a region (a clod G) which cannot be cut by a cutting fluid jet (J) is found instantaneously, the clod (G) is thereafter cut by another cutting fluid jet (a jet J1 or J2). In other words, even if a large clod (G) remains in the ground after it cannot be cut by a cutting fluid jet (a jet J1 or J2) instantaneously, the clod (G) is assuredly cut by any flow line of a cutting fluid jet (a jet J1 or J2).
- Thus, according to the present invention, an extensive presence of a region (a clod G) which is not cut by jet flows (jets J) of a cutting fluid is prevented. Also, the method for improving ground of the present invention prevents a clod (G) whose representative size is large from extending parallel to flow lines of the jet flow (the jets J) of the cutting fluid and remaining in the ground, and it is possible to prevent a region (a clod M) which is not cut by a cutting fluid jet (J) from becoming too large (i.e. prevent the representative size from becoming too large).
- Accordingly, the maximum size of the clod (M) which is not cut to remain in the ground becomes smaller and readily passes a gap S (a circular space) between a jet device (1) and an inner wall surface of a drilling hole (HD). Specifically, this means that the maximum size of the clod (M) which is not cut to remain in the ground does not prevent slime from being discharged above the ground.
- In a case that the method for improving ground of the present invention is constructed so as to make the angle of nozzles (N1, N2) (θ: the inject angle of jets J1 and J2) is adjustable, it is possible to cut a construction ground (G) by using an efficient cutting diameter (D) according to the type of soil on the construction ground (G).
- In the present invention, in a case it is constructed that the interval (V) in a vertical direction between the nozzles (N1, N2) is adjustable, it is possible to adjust a pitch (P) between flow lines of a jet flow (J) of a cutting fluid, and it is thus possible to adjust the maximum size of the clod (M) which is not cut by the jet flow (J) of the cutting fluid to remain in the ground according to the state of a construction site.
- In the present invention, a partition forming material (jets J1, J2) is injected from an upward nozzle of a jet device (10) as a cutting fluid, and a solidification material (jets J3, J4) is injected from a downward nozzle of the jet device (10). Accordingly, a layer of the partition forming material (a separation layer LD) obtained by mixing the partition forming material and a cut in-situ soil is formed upward, and a layer of the solidification material (LC) obtained by mixing the partition forming material, the cut in-situ soil and the solidification material is formed downward.
- Thus, only a mixture of the partition forming material and the soil in the separation layer (LD) composed of the partition forming material is discharged above the ground as slime (a mixture of the partition forming material and the cut soil), and a rich-mixed solidification material in the layer of the solidification material (LC) is hardly discharged above the ground. Since the solidification material is not discharged above the ground, waste of a solidification material is reduced and the amount of slime to be treated as an industrial waste in a dedicated plant is reduced.
- Also, since the solidification material (jets J3 and J4) is injected from the downward nozzle of the jet device (10), a mixture of the in-situ soil (clay) and the partition forming material is favorably mixed with the solidification material, even if the viscosity of the in-situ soil (e.g. clay) is high.
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Fig. 1 is a schematic view showing a first embodiment of the present invention; -
Fig. 2 is a schematic view showing the state in which a ground is cut; -
Fig. 3 is a schematic view showing an example of a structure for adjusting the inject angle of a nozzle; -
Fig. 4 is a schematic view showing an example different from a structure for adjusting the inject angle of a nozzle; -
Fig. 5 is a schematic view showing one example of a structure for adjusting the interval of a nozzle; -
Fig. 6 is a schematic view showing an example different from a structure for adjusting the interval of a nozzle; -
Fig. 7 is a schematic view showing an embodiment of the present invention; -
Fig. 8 is a schematic view showing a method for improving ground in prior art; -
Fig. 9 is a schematic view showing the state in which a ground is cut by the method for improving ground in prior art; -
Fig. 10 is a schematic view showing one example of a cut clod by the method for improving ground in prior art; and -
Fig. 11 is a schematic view showing a problem in the method for improving ground in prior art. - An embodiment of the present invention will be described hereinafter, with reference to drawings of
Figs. 1 to 7 . - First, an example will be described with reference to
Figs . 1 to 6 . - In a prior art shown in
Figs. 8 and11 , a pair of nozzles N have a common position in a vertical direction (in upward and downward directions inFigs. 8 and11 ), and a cutting fluid (e.g. high-pressure water: a jet flow (a cutting fluid jet J) that can contain a solidification material) is injected in a horizontal direction. - Meanwhile, according to an embodiment shown in
Figs. 1 to 6 , the positions of nozzles N1, N2 in a vertical direction (in upward and downward directions inFig. 1 ) are different, and a cutting fluid jet J is injected in a skewed direction with respect to a horizontal direction. - In
Fig. 1 , a rod-shapedjet device 1 for injecting a jet flow J (a cutting fluid jet) of a cutting fluid (e.g. high-pressure water) is inserted into a drilling hole HD drilled in a ground G to be improved. - The
jet device 1 is provided with nozzles N1 and N2 on a side face thereof, and cutting fluid jets J1, J2 are injected from the nozzles N1 and N2. In this description, the jets J1 and J2 are collectively referred to as a jet J. - The nozzles N1 and N2 are disposed at an interval V in a vertical direction (in upward and downward directions in
Fig. 1 ) . - In
Fig. 1 , a symbol CL represents a central axis of ajet device 1. - The cutting fluid jet J1 is injected from the upward nozzle N1 in a downward skewed direction relative to a horizontal direction, and a inject direction of the cutting fluid jet J1 is downward inclined by an angle θ with respect to a horizontal direction HO. The horizontal direction HO is a direction vertically extending with respect to a central axis CL of the
jet device 1. - On the other hand, the cutting fluid jet J2 is injected from the downward nozzle N2 in an upward direction relative to the horizontal direction, and a inject direction of the cutting fluid jet J2 is upward inclined by an angle θ with respect to the horizontal direction HO.
- In
Fig. 1 , a symbol D represents a cutting diameter of a region (a cutting hole HC) cut by jets J1 and J2, and the cut diameter of the cutting hole HC (the distance between the central axis CL of thejet device 1 and an inner wall of the cutting hole HC) is D/2. - It is possible to employ a known device for the
jet device 1, and a cutting fluid is introduced from a feed device (not shown) provided above the ground to thejet device 1, and flows through a flow passage for a cutting fluid (not shown) in thejet device 1, and cutting fluid jets J1 and J2 are injected from the nozzles N1 and N2 in an outward radial direction (underground). - The
jet device 1 injects the cutting fluid jets J1 and J2 to cut a ground G, and is rotated as shown in an arrowed direction R and pulled up toward a ground surface (upward inFig. 1 : in an arrowed direction U). - The amount of pulling up the jet device 1 (the amount of moving
jet device 1 in an arrowed U direction during one rotation) is represented by a symbol P. - The ground G is cut by the cutting fluid jets J1 and J2 to form the cutting hole HC. As the ground G is cut, a solidification material (e.g. cement fluid) is delivered from a discharge port (not shown) provided around a lower end portion of the
jet device 1 via a solidification material flow passage (not shown) in thejet device 1. Accordingly, the solidification material is mixed with an in-situ cut soil and a cutting fluid (e.g. high-pressure water) and filled in the cutting hole HC and then solidified to form an underground consolidated body (not shown). - In
Fig. 1 , slime generated when cutting the ground, as indicated by an arrowed direction AD, is discharged above the ground via a gap S (a circular space) between thejet device 1 and an inner wall surface of the drilling hole HD. - As described above, the nozzles N1, N2 are located at an interval V in a vertical direction. The cutting fluid jet J1 is injected from the upward nozzle N1 in a downward skewed direction, and the cutting fluid jet J2 is injected from the downward nozzle N2 in an upward skewed direction. For this purpose, when the
jet device 11 is rotated on a cross section (an optional identical cross section) a plurality of times and pulled up, all flow lines of the cutting fluid jets J1, J2 are shown inFig. 2 . - Specifically, according to the first embodiment, flow lines of the cutting fluid jets J1 and J2 shown in
Fig. 2 provide a shape obtained when a plurality of straight lines by the cutting fluid jet J1 (the same straight lines as the jet J1) parallel to each other extending from upper left to lower right and a plurality of straight lines by the cutting fluid jet J2 (the same straight lines as the jet J2) parallel to each other extending from lower left to upper right intersect on the right side of thejet device 1 inFig. 2 on a cross section (an optional identical cross section). - Herein, the cross section (the optional identical cross section) refers to a plane containing a central axis CL (
Fig. 1 ) of thejet device 1 inFigs. 1 and 2 and extending in a radial direction and a vertical direction (upward and downward directions inFig. 2 ), which is found in the entire circumference at 360° degrees with respect to the central axis CL of thejet device 1. - The interval P (pitch) of a plurality of cutting fluid jets J1, J1 injected from upper left to lower right, or the interval P (pitch) of a plurality of jets J2, J2 injected from lower left to upper right on a plane on the right side of e.g. the
jet device 1 inFig. 2 refers to the amount of upward moving thejet device 1 during one rotation (the amount of pulling up the same), e.g. 2.5cm in the embodiment shown in the drawings. - In
Fig. 2 , the interval in upward and downward directions of the most downward flow line of the cutting fluid jet J1 and the most downward flow line of the cutting fluid jet J2 is equal to the distance V between the nozzles N1 and N2. - In
Fig. 2 , an in-situ soil (ground, bedrock, rock, etc.) found in flow lines of a plurality of the cutting fluid jets J1, J2 extending parallel to each other at a predetermined interval (pitch P) is cut by the cutting fluid jet. - An in-situ soil in a region not found on the flow lines of the cutting fluid jets J1, J2 or in a region α surrounded by the flow lines of the cutting fluid jets J1, J2 is not cut by the cutting fluid jets J1, J2. In
Fig. 2 , only one region α surrounded by the flow lines of the cutting fluid jets J1, J2 is shown by hatching. - Since the in-situ soil found in the region α is not cut by the cutting fluid jets J1, J2, the soil may remain in the ground while a clod M found in the region α is not cut.
- However, on a cross section (an optional identical cross section) in
Fig. 2 , the largest clod which is not cut by the flow lines of a plurality of the cutting fluid jets J1, J2 on the cross section to remain in the ground corresponds to a clod M found in a rhombic region α inFig. 2 . The clod M found in the region α inFig. 2 has a smaller representative size than those of clods shown inFigs. 10 and 11 . - Since the clod M found in the region α in
Fig. 2 has a smaller representative size, the clod M can readily pass a circular space S (Fig. 1 ) between thejet device 1 and the inner wall surface of the drilling hole HD together with slime. In other words, a clod M found in the region α inFig. 2 whose representative size is small does not prevent the slime from being discharged above the ground. - Herein, main factors for determining a cutting diameter D of the cutting hole HC include the injection pressure of the cutting fluid jet J and the injection flow of the cutting fluid jet J. The number of cutting and the rotational speed of the
jet device 1 also affect the cutting diameter D. - Inventors of the present invention found that a clay ground has a cutting diameter D of 4m or more, and a sand ground has a cutting diameter D of 5m or more.
- In
Fig. 1 , the angle θ in the nozzles N1, N2 (the inject angle of jets J1, J2) is adjusted to adjust the injection pressure of said cutting fluid jet J and to determine the cutting diameter D. - As another parameter in addition to the above described parameters, the injection pressure of the cutting fluid jet J is a uniaxial compressive strength of soil in the construction ground G or more, for example, 300bar or more.
- In addition, the injection flow Q of the cutting fluid jet J is expressed by an equation Q: Q=300 (liter/min.) × the number of nozzles.
- In addition, the rotational speed of the
jet device 1 is 5rpm, and the number of cutting is 1 to 2. Specifically, each time thejet device 1 is rotated half to one time, thejet device 1 is pulled up (or stepped-up). - In the embodiment shown in the drawings, as described above, the cutting diameter D can be determined by adjusting the angle θ in the nozzles N1, N2 (the inject angle of jets J1, J2) .
- Consequently, in the embodiment shown in the drawings, the angle θ in the nozzles N1, N2 (the inject angle of jets J1, J2) can preferably be adjusted.
-
Figs. 3 and 4 show a structure for adjusting the angle θ in nozzles N1, N2 (the inject angle of jets J1, J2). - First, the structure shown in
Fig. 3 will be described. -
Fig. 3 shows that a nozzle N1 is attached with respect to a central axis CL of ajet device 1. Thejet device 1 includes a flow passage for a cuttingfluid 1A, and a cutting fluid flows through the flow passage for a cuttingfluid 1A. The cutting fluid is fed from a feed device above the ground (not shown), pressurized by a pressure device (not shown) and fed in an arrowed direction AB inFig. 3 to be injected from the nozzle N1 and a nozzle N2 in an arrowed direction AC. - In
Fig. 3 , a symbol 1B represents a notch for providing a range of motion by adjusting the inject angle of the nozzle N1 provided at thejet device 1. - The structure for adjusting the inject angle shown in
Fig. 3 is a structure for adjusting the inject angle of the nozzle N1, and includes a cover plate for adjusting a injectangle 2 and an insertion plate for adjusting a injectangle 3. - The cover plate for adjusting a inject
angle 2 is a tabular body extending in upward and downward directions placed attached to the jet device 1 (only a casing of a pipe-shapedjet device 1 is shown inFig. 3 ). Aninsertion portion 2A is provided at thejet device 1 of the cover plate for adjusting the inject angle 2 (on the left side ofFig. 3 ), and theinsertion portion 2A is constructed so that the insertion plate for adjusting a injectangle 3 can be inserted. Theinsertion portion 2A forms an inner space of the cover plate for adjusting a injectangle 2, and abottom portion 2B of theinsertion portion 2A is an outer surface (an outer wall surface) of the casing of thejet device 1. - The size of the space formed by the
insertion portion 2A in an elevational direction (a radial direction: right and left directions inFig. 4 ) gradually decreases from an inlet thereof (a lower end portion of the cover plate for adjusting a inject angle 2) in an upward direction inFig. 4 . The angle (insertion angle) formed by thebottom portion 2B of theinsertion portion 2A (the outer surface of the casing of the jet device 1) and an upper surface portion 2C of theinsertion portion 2A is represented by a symbol ϕ1. - The cover plate for adjusting a inject
angle 2 is pivotably supported with respect to asupport shaft 2D of thejet device 1 around an upper end portion thereof, and is always energized by an energizing device (e.g. a spring) (not shown) in an arrowed direction F or in a direction for pressing the cover plate for adjusting a injectangle 2 on thejet device 1. - The nozzle N1 is fixed on said cover plate for adjusting a inject
angle 2 to be integrally pivoted with thecover plate 2. Thus, when the cover plate for adjusting a injectangle 2 is pivoted from an initial position (when the cover plate for adjusting a injectangle 2 is pressed on an outer wall surface of the jet device 1: a position shown inFig. 3 ) clockwise against said energizing force F, the nozzle N1 is pivoted around thesupport shaft 2D and pivoted in a direction for decreasing the inject angle θ. - The insertion plate for adjusting a inject
angle 3 is overall a triangle pole body, comprising abottom portion 3A which contacts with the outer wall surface of thejet device 1 and anupper surface portion 3B which gradually increases the thickness from an end portion toward a backward side (from upper to lower directions inFig. 3 ). The angle of the end portion of the insertion plate for adjusting a injectangle 3 is represented by a symbol ϕ2. Herein, the relationship between the insertion angle ϕ1 of theinsertion portion 2A of the cover plate for adjusting a injectangle 2 and the end portion angle ϕ2 of the insertion plate for adjusting a injectangle 3 is expressed by an equation: angle ϕ1 < angle ϕ2. Therefore, when the insertion plate for adjusting a injectangle 3 is inserted, the cover plate for adjusting a injectangle 2 and the nozzle N1 will be pivoted clockwise. - The insertion plate for adjusting a inject
angle 3 can be inserted into theinsertion portion 2A of the cover plate for adjusting a inject angle 2 (can be moved in an arrowed direction AE). By adjusting the amount of inserting the insertion plate for adjusting a injectangle 3 into theinsertion portion 2A of the cover plate for adjusting a injectangle 2, the inject angle θ of the nozzle N1 can be adjusted when the cover plate for adjusting the injectangle 2 and the nozzle N1 are pivoted clockwise with respect to thesupport shaft 2D against an energizing force F. - Specifically, when the insertion plate for adjusting a inject
angle 3 is inserted in a direction for pressing the same on theinsertion portion 2A, the cover plate for adjusting a injectangle 2 and the nozzle N1 are pivoted clockwise to decrease the inject angle θ. Meanwhile, when the insertion plate for adjusting the injectangle 3 is moved in a direction so that it is removed from theinsertion portion 2A, the cover plate for adjusting a injectangle 2 and the nozzle N1 are pivoted counterclockwise against the energizing force F to increase the inject angle θ. - While the method for adjusting the inject angle θ in the nozzle N1 is described above, the inject angle θ in the nozzle N2 can be adjusted according to the same structure.
-
Fig. 4 shows a structure for adjusting the inject angle different from the one shown inFig. 3 . - In
Fig. 4 , the center of the nozzle N1 in a inject direction is fixed on anoutput shaft 4A of a known steppingmotor 4. Theoutput shaft 4A of the steppingmotor 4 is attached to the jet device (not shown) . An arrowed direction AC inFig. 4 represents the inject direction of a cutting fluid jet J1. - In
Fig. 4 , by subjecting the steppingmotor 4 to positive rotation or negative rotation by a proper angle, the nozzle N1 is pivoted by an optional central angle to adjust the inject angle θ of the nozzle N1. - The structure for adjusting the inject angle θ in
Fig. 4 can be applied to the nozzle N2. - In the embodiment shown in the drawings, the largest representative size of the clod M which is not cut by a cutting fluid jet J and instead is peeled off from a construction ground G is affected by the size of a pitch (a pitch for stepping up the jet device) represented by a symbol P in
Fig. 2 . - The pitch P is a parameter which varies according to the interval V in a vertical direction between the nozzles N1, N2. In other words, when the interval V in a vertical direction between the nozzles N1, N2 is adjusted, the pitch P can be adjusted.
-
Figs. 5 and 6 illustrate a structure for adjusting the interval V in a vertical direction between the nozzles N1, N2. - First, the structure in
Fig. 5 will be described. -
Fig. 5 is a schematic view showing an attaching portion of nozzles N1 and N2 of ajet device 1 viewed from a side face. Thejet device 1 is divided into halves at a predetermined position (at a predetermined position in a vertical direction) between the nozzles N1, N2, and aspacer 5 of a thickness T is placed between thejet devices - Herein, an internal structure of the
spacer 5 is the same as thejet devices jet devices spacer 5 and connecting means (e.g. a swivel joint) (not shown) . Thus, thejet devices spacer 5 serve as a jet device to inject or deliver a cutting fluid (and a solidification material). - The
jet devices spacer 5 are connected by a known technology (e.g. bonding, fastening means, etc.). - The interval V in a vertical direction between the nozzles N1, N2 can be adjusted by placing the
spacer 5 between thejet devices - If the interval V in a vertical direction between the nozzles N1, N2 is set at the minimum interval between the nozzles N1, N2 (the interval in a vertical direction) when the
spacer 5 is not placed between thejet devices spacer 5 is placed between thejet devices - Further, a plurality of
spacers 5 having a different thickness T are prepared, and the range of the interval in a vertical direction between the nozzles N1, N2 can be adjusted accordingly. -
Fig. 6 shows a structure for adjusting the interval V in a vertical direction different from the one inFig. 5 . InFig. 6 , the interval V in a vertical direction is adjusted by using a known rack and a pinion gear structure. - In
Fig. 6 , arotating shaft 7A of apinion gear 7 is attached to a jet device (not shown) to mesh with a rack 6. The rack 6 is fixed to the nozzle N1 to extend parallel to a central axis of the jet device 1 (Fig. 1 ). By subjecting thepinion gear 7 to positive rotation or negative rotation to move the rack 6 upward and downward, the nozzle N1 will move upward and downward. Accordingly, the interval in a vertical direction between the nozzles N1, N2 can be adjusted. - In
Fig. 6 , an arrowed direction AC represents a direction of a cutting fluid jet J1. - In addition, in
Fig. 6 in which only the nozzle N1 is constructed to move upward and downward, only the nozzle N2 can be fixed to a rack 6 to move upward and downward. Further, when the nozzles N1, N2 are fixed to another rack, respectively, and thepinion gear 7 is rotated, the nozzles N1, N2 will move in a direction opposite to upward and downward directions to adjust the interval V in a vertical direction between the nozzles N1, N2. - According to the first embodiment shown in the drawings, the nozzles N1, N2 of the
jet device 1 are located at an interval in a vertical direction, the cutting fluid jet J1 is injected from the upward nozzle N1 in a downward skewed direction, and the cutting fluid jet J2 is injected from the downward nozzle N2 in an upward skewed direction. Accordingly, if flow lines of the cutting fluid jets J1 and J2 are in a region on the right side of thejet device 1 inFig. 2 on an optional position plane, they provide a plurality of straight lines parallel to each other extending from upper left to lower right and a plurality of straight lines parallel to each other extending from lower left to upper right. - Thus, as shown in
Fig. 10 , a region which is not cut by a cutting fluid jet never extends parallel to flow lines of the cutting fluid jet, and flow lines of another cutting fluid jet assuredly intersects the region which is not cut thereby. - Specifically, even if a region which is not cut by a cutting fluid jet is found instantaneously, the region will thereafter be cut by intersecting any of the cutting fluid jets J1, J2. Accordingly, a larger representative size of a region which is not cut by the cutting fluid jet is prevented.
- Consequently, according to the first embodiment shown in the drawings, the largest clod M which is not cut by the cutting fluid jet to remain in the ground has a smaller representative size than the large clods M shown in
Figs. 10 and 11 , and readily passes a circular space (Figs. 1 and11 ) between thejet device 1 and an inner wall surface of a drilling hole HD. As a result, discharge of slime above the ground is not prevented. - In the embodiment shown in the drawings, since the angle θ in the nozzles N1, N2 (the inject angle of the cutting fluid jets J1, J2) can be adjusted, the cutting diameter D can efficiently be adjusted according to the type of soil in a construction ground G.
- Additionally, in the embodiment shown in the drawings, since the interval V in a vertical direction between the nozzles N1, N2 can be adjusted, the pitch P of jet flow lines shown in
Fig. 2 can be adjusted. Therefore, according to the condition of a construction site, the largest representative size of the clod M which is not cut by a jet to remain in the ground can be adjusted. - Next, an embodiment of the present invention will be described with reference to
Fig. 7 . - In
Fig. 7 , jets J1, J2 are injected from an upward nozzle N1 of ajet device 10. As described in the first embodiment shown inFigs. 1 to 6 , the jet J1 is injected from the nozzle N1 in a downward skewed direction relative to a horizontal direction, and the jet J2 is injected from the nozzle N2 in an upward skewed direction relative to the horizontal direction. - Although
Fig. 7 does not clearly show, as for the jets J1, J2, a radial direction inward (central) portion of a cross section thereof is a jet flow of a partition forming material, and its circumference is surrounded by a jet flow of a high-pressure air. However, even if the high-pressure air is not ejected, the second embodiment can be implemented. - For example, the partition forming material is a solution containing 5% by weight of a thickener (e.g. guar gum as a natural water-soluble polymer material) and 5% by weight of sodium silicate (water glass). The partition forming material is injected to the soil to be mixed with an in-situ soil to form a separation layer LD.
- Meanwhile, jets J3, J4 injected from downward nozzles N3, N4 are jet flows of a solidification material.
- By injecting the jets J3, J4, a solidification material is mixed with a mixture of the partition forming material and the cut in-situ soil.
- In order to inject the solidification material by injecting the jets J3, J4 from the
jet device 10 which is pulled up by rotating the same, even if the in-situ soil is e.g. a clay, a mixture of the in-situ soil (clay) and the partition forming material are favorably mixed with the solidification material. - Herein, a mixture of the in-situ soil (clay) and the partition forming material passes a circular space S between the
jet device 10 and an inner wall surface of a drilling hole HD as shown in an arrowed direction AD as slime to be discharged above the ground. Nevertheless, since the mixture of the in-situ soil (clay) and the partition forming material contains no solidification material, it is not necessary for the mixture to be treated as an industrial waste, thereby no deterioration of working conditions. - As shown in
Fig. 7 , by cutting a ground G by injecting the partition forming material by injecting the jets J1, J2, a separation layer LD is formed in an upward region of a space IJ cut by the jets J1, J2 (a space filled with the in-situ soil and the partition forming material) . The separation layer LD serves as a divider so that the solidification material injected from the nozzles N3, N4 does not flow into a circular space S between thejet device 10 and the inner wall surface of the drilling hole HD. - By injecting a solidification material in a downward region of the space IJ cut by the jets J1, J2 by injecting the jets J3, J4, a layer LC of a rich-mixed solidification material (having a low W/C, the ratio of water to a solidification material) is formed in a downward region of the space IJ.
- Herein, the downward jets J3, J4 collide with a cut wall W (an inner wall surface of a diameter-expanded cutting hole cut by the jets J1, J2). Then, if they are rolled up as shown in an arrowed direction AN, a solidification material might be mixed with the separation layer LD (comprising a mixture of the partition forming material and the cut soil). When the solidification material is mixed with the separation layer LD, the solidification material might be discharged above the ground as slime.
- In order to prevent from the solidification material from being discharged above the ground, it is necessary for the downward jets J3, J4 to roll down downward as shown in an arrowed direction AG when they collide with the cut wall W. Thus, as shown in
Fig. 7 , the downward jets J3, J4 face downward by an angle β with respect to a horizontal direction HO. - Inventors of the present invention experimentally found that when the injection pressure of the downward jets J3, J4 is 100bar, said inclined angle β is preferably 15°, and when the injection pressure of the jets J3, J4 is 200bar, the inclined angle β is preferably 30°. Also, mixture of a solidification material with a separation layer LD was prevented.
- According to the second embodiment in
Fig. 7 , as thejet device 10 is pulled up, the size of the layer LC of the solidification material in a vertical direction becomes larger (thicker), and the separation layer LD (the layer of the partition forming material) always moves in an upward direction of the layer LC of the solidification material. - To provide a separation layer LD composed of a partition forming material, a mixture of the partition forming material and soil is discharged above the ground as slime (a mixture of the partition forming material and the cut soil). But, a rich-mixed solidification material in the layer LC of the solidification material is hardly discharged above the ground. Since the solidification material is not discharged above the ground, waste of the solidification material is reduced, and the amount of slime to be treated as an industrial waste in a dedicated plant is reduced.
- In addition, the solidification material is injected by the jets J3, J4 from the downward nozzles N3, N4 of the
jet device 10, and thejet device 10 is pulled up by rotating the same. Consequently, even if the viscosity of an in-situ soil (e.g. clay) is high, a mixture of the in-situ soil (clay) and the partition forming material is favorably mixed with the solidification material. - Other constructions and effects of the second embodiment shown in
Fig. 7 are the same as the constructions and effects of the first embodiment shown inFigs. 1 to 6 . - It should be note that the explanations relating to the embodiments shown in the drawings are merely examples and that the technical scope covered by the present invention is not restricted by such the explanations of the embodiments shown in the drawings. The embodiments composed of substantially the same technical concept as disclosed in the claims of the present invention and expressing a similar effect are included in the technical scope of the present invention.
- In the embodiment shown in the drawings, for example, two nozzles are provided, but if nozzles are symmetrically disposed about a point with respect to a central axis CL of a jet device, 3 or more nozzles can be provided.
- In addition, in the embodiment shown in the drawings, a solidification material is delivered from a discharge port provided in a downward direction of the jet device and delivered to a mixture of a cut in-situ soil and a cut fluid. However, like a cutting fluid jet J or together therewith, the solidification material may be injected in an outward radial direction.
-
- 1, 10, 11...Jet device
- HC...Cutting hole
- HD...Drilling hole
- IJ...Cut space
- J, J1, J2...Cutting fluid jet
- LC...Layer of solidification material
- LD...Layer of partition forming material (separation layer) N, N1, N2, N3, N4...Nozzle (inject nozzle)
- S...Circular space
- W...Cut wall (inner wall surface of cutting hole)
-
- [
Fig. 1 ] - [
Fig. 2 ] - [
Fig. 3 ] - [
Fig. 4 ] - [
Fig. 5 ] - [
Fig. 6 ] - [
Fig. 7 ] - [
Fig. 8 ] - [
Fig. 9 ] - [
Fig. 10 ] - [
Fig. 11 ]
Claims (3)
- A method for improving ground comprising the steps of:cutting a ground by injecting a cutting fluid from a first nozzle (N1) and a second nozzle (N2) of a jet device (10) ;injecting a solidification material from a third nozzle (N3) and a fourth nozzle (N4) of the jet device (10); mixing a cut ground, the cutting fluid and the solidification material; and agitating a mixture thereof to form an underground consolidated body, wherein
the first nozzle (N1) is located above the second nozzle (N2) in a vertical direction on the jet device (10) ; the third (N3) and fourth nozzles (N4) are located below the second nozzle (N4) in the vertical direction; the cutting fluid is injected from the first nozzle (N1) in a downward skewed direction and from the second nozzle (N2) in an upward skewed direction; and the solidification material is injected from the third and fourth nozzles (N3, N4) at an angle downward. - The method for improving ground according to claim 1, wherein the angle downward of the third and fourth nozzles (N3, N4) is 15° or 30°.
- The method for improving ground according to the claim 2, wherein the solidification material is injected with an injection pressure of 100bar when the angle downward is 15° and 200bar when the angle downward is 30°.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2014204546A JP2016075040A (en) | 2014-10-03 | 2014-10-03 | Ground improvement method |
PCT/JP2015/065176 WO2016051858A1 (en) | 2014-10-03 | 2015-05-27 | Ground improving method |
Publications (3)
Publication Number | Publication Date |
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EP3202982A1 EP3202982A1 (en) | 2017-08-09 |
EP3202982A4 EP3202982A4 (en) | 2018-05-30 |
EP3202982B1 true EP3202982B1 (en) | 2020-07-15 |
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ID=55629914
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EP15846895.9A Active EP3202982B1 (en) | 2014-10-03 | 2015-05-27 | Ground improving method |
Country Status (7)
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US (1) | US20180112368A1 (en) |
EP (1) | EP3202982B1 (en) |
JP (1) | JP2016075040A (en) |
AU (1) | AU2015326129B2 (en) |
CA (1) | CA2963217C (en) |
SG (1) | SG11201702724XA (en) |
WO (1) | WO2016051858A1 (en) |
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JP2020076276A (en) * | 2018-11-09 | 2020-05-21 | 株式会社不動テトラ | Solidified pile forming method |
CN111074878B (en) * | 2019-12-11 | 2021-08-13 | 江苏科技大学 | Silt long type mud flat foundation reinforcing device and construction method thereof |
KR102437016B1 (en) * | 2020-11-12 | 2022-08-26 | 덴버코리아이엔씨(주) | Ground improvement system by high pressure jet grouting |
CN114247331B (en) * | 2022-01-19 | 2024-02-09 | 中煤科工集团西安研究院有限公司 | Top plate horizontal well tail end double-material mixing device, system and solidification method during filling |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH079087B2 (en) * | 1989-01-10 | 1995-02-01 | 株式会社エヌ、アイ、ティ | Ground hardening agent injection injection device |
JP2673872B2 (en) * | 1993-09-07 | 1997-11-05 | 鹿島建設株式会社 | Ground improvement method |
JPH07109726A (en) * | 1993-10-14 | 1995-04-25 | Chem Grouting Co Ltd | Adjustment method of solidified material diameter in molding of cylindrical solidified material by use of telescopic pipe and device thereof |
JPH10204875A (en) * | 1997-01-28 | 1998-08-04 | Chem Grouting Co Ltd | Method and device for controlling finish diameter of underground consolidation body |
JP3694849B2 (en) * | 1998-07-28 | 2005-09-14 | 東洋建設株式会社 | High-pressure jet stirring method |
JP2001115442A (en) * | 1999-10-14 | 2001-04-24 | Chem Grouting Co Ltd | Ground improvement method |
JP2013036213A (en) * | 2011-08-07 | 2013-02-21 | Hiroko Matsumoto | Ground division improvement method |
-
2014
- 2014-10-03 JP JP2014204546A patent/JP2016075040A/en active Pending
-
2015
- 2015-05-27 CA CA2963217A patent/CA2963217C/en active Active
- 2015-05-27 AU AU2015326129A patent/AU2015326129B2/en active Active
- 2015-05-27 US US15/516,185 patent/US20180112368A1/en not_active Abandoned
- 2015-05-27 WO PCT/JP2015/065176 patent/WO2016051858A1/en active Application Filing
- 2015-05-27 EP EP15846895.9A patent/EP3202982B1/en active Active
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CA2963217C (en) | 2022-09-27 |
JP2016075040A (en) | 2016-05-12 |
CA2963217A1 (en) | 2016-04-07 |
AU2015326129B2 (en) | 2019-12-05 |
AU2015326129A1 (en) | 2017-04-27 |
US20180112368A1 (en) | 2018-04-26 |
SG11201702724XA (en) | 2017-06-29 |
EP3202982A1 (en) | 2017-08-09 |
WO2016051858A1 (en) | 2016-04-07 |
EP3202982A4 (en) | 2018-05-30 |
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