JP2019027238A - High-pressure injection device - Google Patents

Abstract

To provide a high-pressure injection device which can expand a range of drilling and ground improvement by rotation of a plurality of rotary nozzles provided on the tip of a rod without rotation of the rod, has a simple structure, and is inexpensive.SOLUTION: A high-pressure injection device 40 that performs drilling and improvement of a ground by high-pressure injecting a fluid S of water or a cement slurry from an injection nozzle provided on a rod 30 in the ground includes the rod 30 for supplying the fluid S, and multiple rotary nozzles 41 and 42 which are provided on a tip 30a of the rod 30 and rotate by a reaction force of an injection force of the fluid S, where the multiple rotary nozzles 41 and 42 are provided respectively on injection nozzles 57 and 58 for high-pressure injecting the fluid S.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a high-pressure injection device that performs high-pressure injection of water or a solidified material into the ground to drill and improve the ground.

  An example of this type of high-pressure injection method is disclosed in Patent Document 1.

  In this high-pressure injection method, the injection rod (rotating rod) is rotated and penetrated into the ground. When a predetermined depth is reached, the cement slurry is injected in a horizontal direction from the nozzle provided at the side wall of the tip of the injection rod. Thus, it is a construction method for producing a cylindrical improvement body centering on the injection rod.

JP 2007-56477 A JP 2002-227179 A

  However, in the conventional high-pressure injection method, since cement slurry is jet-injected in one direction from a nozzle installed in a direction perpendicular to the injection rod (shaft), injection improvement can be performed only within a certain range. Further, since it is necessary to rotate the injection rod, a swivel or rod rotation mechanism is indispensable.

  Therefore, the present invention has been made to solve the above-described problems, and expands the range of drilling and ground improvement by rotating a plurality of rotating nozzles provided at the tip of the rod without rotating the rod. An object of the present invention is to provide a high-pressure injection device that is simple and inexpensive.

  A high-pressure spraying device that performs high-pressure spraying of a fluid from a spray nozzle provided on a rod in the ground of the present invention to drill and improve the ground, a rod that supplies the fluid, and a tip of the rod And a plurality of rotating nozzles that are rotated by a reaction force of the fluid injection force, and each of the plurality of rotating nozzles is provided with an injection nozzle that injects the fluid at a high pressure.

  According to the high-pressure injection device of the present invention, it is provided with a rod for supplying fluid, and a plurality of rotary nozzles that are provided at the tip of the rod and that are rotated by a reaction force of the fluid injection force, and fluid is supplied to the plurality of rotary nozzles. By providing each of the injection nozzles for high-pressure injection, the range of drilling and ground improvement can be expanded by rotating a plurality of rotating nozzles provided at the tip of the rod without rotating the rod. That is, since the pressure, flow rate, rotation direction, speed, etc. of the high pressure (jet) fluid from each injection nozzle of a plurality of rotary nozzles can be changed according to the purpose, the injection rod that rotates as before The diameter of drilling and ground improvement can be increased compared with the case of using one nozzle. Further, since the rod does not penetrate into or pull out from the ground while rotating, the swivel or the rod rotating mechanism becomes unnecessary, and accordingly, the entire structure can be simplified and the cost can be reduced.

It is sectional drawing of the high pressure injection apparatus of 1st Embodiment of this invention. (A) is explanatory drawing of the injection flow of the injection nozzle provided in the said high pressure injection apparatus, (b) is a schematic explanatory drawing which shows the relationship between the rotary body of the high pressure injection apparatus, and an injection nozzle. It is explanatory drawing which shows the rotation principle of the rotating nozzle of the said high pressure injection apparatus. It is a side view of the ground improvement apparatus provided with the said high voltage | pressure injection apparatus. It is explanatory drawing which shows the state which opened the upper chuck | zipper of the said ground improvement apparatus, closed the lower chuck | zipper, and hold | gripped the rod with the lower chuck | zipper. It is explanatory drawing which shows the state immediately before closing the said upper chuck | zipper, opening a lower chuck | zipper, retreating the piston rod of a cylinder, and penetrating a rod in a ground. It is explanatory drawing which shows the state which penetrated the said rod to the predetermined depth in the ground. It is explanatory drawing which shows the state which opened the upper chuck | zipper after closing the said rod to the predetermined depth in the ground, closed the lower chuck | zipper, and hold | gripped the rod with the lower chuck | zipper. It is explanatory drawing which shows the state which opened the upper chuck | zipper and advanced the piston rod of the cylinder and raised the upper chuck | zipper in the state which hold | gripped the said rod with the lower chuck | zipper. It is explanatory drawing which shows the state which improves the ground, pulling out a rod, after adding a plurality of the rods and penetrating them to a predetermined depth. It is sectional drawing of the high pressure injection apparatus of 2nd Embodiment of this invention. It is sectional drawing of the high pressure injection apparatus of 3rd Embodiment of this invention. It is explanatory drawing which shows the state at the time of the ground improvement by the high pressure injection apparatus of the said 3rd Embodiment. It is a perspective view which shows the principal part of the state of the ground improvement by the high pressure injection apparatus of the said 3rd Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 is a cross-sectional view of a high-pressure injection device according to a first embodiment of the present invention, FIG. 2 (a) is an explanatory view of an injection flow of an injection nozzle provided in the high-pressure injection device, and FIG. 2 (b) is the same high-pressure injection. FIG. 3 is an explanatory diagram showing the rotation principle of the rotary nozzle of the high-pressure injection device, FIG. 4 is a side view of a ground improvement device equipped with the high-pressure injection device, 5-10 is explanatory drawing which shows the ground improvement by the high pressure injection apparatus later on.

  As shown in FIGS. 1 and 2 (a), the high-pressure injection device 40 rotates (rotates) by the reaction force of the injection force of the fluid S injected from the injection nozzles 57 and 58 described later on the tip 30a side of the rod 30. 1) and 2nd rotating nozzles 41 and 42 are provided.

  As shown in FIGS. 4 to 10, the ground improvement device 10 holds the cylindrical rod 30 that supplies the fluid S and the rod 30 in a substantially vertical standing state via the pair of brackets 12 and 12. A pedestal (device main body) 11 and a pair of brackets 12, 12, a rod elevating drive mechanism 20 that penetrates and pulls into the ground 1 without rotating the rod 30, and excavation in the rod 30. A fluid supply hose 35 for supplying a fluid S of water or a cement slurry (solidifying material) for improvement, and a high-pressure injection device 40 attached to the tip 30a of the rod 30 via a lid 31; 1, the fluid S is injected at a high pressure from the injection nozzles 57 and 58 of the rotary nozzles 41 and 42 at the tip 30 a of the rod 30 to perform drilling (excavation) and improvement of the ground 1.

  That is, a fluid supply hose 35 is inserted into the cylindrical rod 30 so that a fluid S fed by pressure from a water tank or plant (not shown) via a pump is supplied. The first rotating nozzle 41 and the second rotating nozzle 42 are rotated in opposite directions by using the injection force of water or solidified material pumped by the pump, and injected from the injection nozzle 57 of the first rotating nozzle 41. The ground 1 is drilled (excavated) by the jet water generated, the rod 30 is penetrated into the ground 1, and the improved body K is formed by the cement slurry injected from the injection nozzle 58 of the second rotary nozzle 42. is there. As shown in FIG. 5, an opening hole 11 a through which the rod 30 and the high pressure injection device 40 pass is formed in the center of the base 11.

  As shown in FIGS. 4 to 10, the rod raising / lowering drive mechanism 20 includes a pair of lower chucks 21, 21 that grip the tip 30 a side of the rod 30, and an upper side (a midway portion of the rod 30). ) And a pair of hydraulic cylinders (cylinders) 23 and 23 for moving the pair of upper chucks 22 and 22 up and down.

  The pair of lower chucks 21 and 21 can be opened and closed by a pair of small hydraulic cylinders (not shown). The pair of upper chucks 22 and 22 can be opened and closed by a pair of small hydraulic cylinders (not shown). Further, the pair of hydraulic cylinders 23 and 23 is composed of a cylinder body 23a and a piston rod 23b that moves forward and backward with respect to the cylinder body 23a. The pair of hydraulic cylinders 23 and 23 are pivotally supported between the upper portions of the pair of brackets 12 and 12 via a support shaft 24 extending horizontally from the upper end side of each cylinder body 23a. The upper chuck 22 is slidably supported by a pin at the upper end of the piston rod 23b, and the upper chuck 22 is moved up and down by the forward and backward movement of the piston rod 23b with respect to the cylinder body 23a.

  As shown in FIGS. 1, 2, and 4 to 10, the high-pressure injection device 40 rotates on the tip 30 a side of the rod 30 in the reverse direction due to the reaction force of the injection force of the fluid S. Nozzles 41 and 42 are provided. That is, a cylindrical lid 31 is fixed to the tip 30 a of the rod 30. A circular hole 31a is formed in the center of the lid 31, and the first rotating in the opposite directions by the reaction force of the injection force of the fluid S supplied from the tip 30a of the rod 30 through the circular hole 31a. The high pressure injection device 40 including the second rotary nozzles 41 and 42 is attached to the lid 31 by a predetermined means.

  As shown in FIG. 1, the first rotary nozzle 41 of the high-pressure injection device 40 includes a holder 44 having a shaft portion 45 formed in the center with a first main fluid passage 46A through which the fluid S flows, and a first main fluid passage 46A. A pair of first sub-fluid passages 46 a, 46 a communicating with each other is formed, and the first rotating body 51 is rotated about the shaft portion 45 of the holder 44 by the reaction force of the injection force of the fluid S.

  As shown in FIGS. 1 and 2B, the second rotating nozzle 42 of the high-pressure injection device 40 includes a holder 44 having a shaft portion 45 formed in the center with a second main fluid passage 47A through which the fluid S flows. A pair of second sub-fluid passages 47a and 47a communicating with the second main fluid passage 47A are formed, and a second rotating body 52 that rotates by the reaction force of the injection force of the fluid S around the shaft portion 45 of the holder 44; , Is composed of.

  The holder 44 is formed in a large-diameter columnar shape, and a cylindrical shaft portion 45 having a smaller diameter than the main body of the holder 44 is integrally formed at the center of the front surface thereof. The shaft portion 45 is formed in a stepped cylindrical shape with a small-diameter shaft portion 45a on the distal end side and a medium-diameter shaft portion 45b on the base portion side, and the first diameter portion 45a is connected to the first through a pair of ball bearings 54, 54. The rotating body 51 is rotatably supported, and the second rotating body 52 is rotatably supported on the medium diameter shaft portion 45b via a pair of ball bearings 55 and 55.

  As shown in FIG. 1, the first main fluid passage 46A of the holder 44 is formed up to the center of the small diameter shaft portion 45a of the shaft portion 45, and the second main fluid passage 47A is partitioned around the first main fluid passage 46A. The shaft portion 45 is formed on the medium diameter shaft portion 45b. The holder 44 and the columnar lid 31 fixed to the tip 30a of the rod 30 are fixed by screwing or welding (predetermined means). Thereby, the fluid S such as water or cement slurry is supplied from the inside of the rod 30 to the first and second main fluid passages 46A and 47A of the holder 44 through the circular hole 31a of the lid 31.

  The first rotating body 51 is formed in a cylindrical shape having the same diameter as the outer diameter of the holder 44, and a central hole 51 a having a circular cross section into which the small diameter shaft portion 45 a of the holder 44 is inserted is formed at the center. The pair of first sub-fluid passages 46a and 46a communicated with the first main fluid passage 46A of the first rotating body 51 are formed in an L shape, and a pair of injection nozzles 57 and 57 are provided at the respective tip ends. The first sub-fluid passages 46a are attached with an inclination at a predetermined angle. The tip ends of the pair of injection nozzles 57 and 57 are exposed outside the front surface 51 c of the first rotating body 51. Further, a pair of annular recesses 51b and 51b are formed on the inner peripheral surface of the center hole 51a of the first rotating body 51 so as to sandwich each first sub-fluid passage 46a, and fitted into each annular recess 51b. The sealed ring 49 prevents the fluid S from leaking from the first auxiliary fluid passage 46a.

  Further, as shown in FIG. 1, the second rotating body 52 is formed in a columnar shape having the same diameter as the outer diameter of the holder 44, and a circular cross section through which the middle diameter shaft portion 45 b of the holder 44 is inserted at the center. The center hole 52a is formed. Further, as shown in FIG. 2B, the pair of second sub-fluid passages 47a and 47a communicated with the second main fluid passage 47A of the second rotating body 52 is formed in a straight line, and each tip thereof A pair of injection nozzles 58 and 58 are attached to the second sub-fluid passage 47a so as to be inclined at a predetermined angle. The tip ends of the pair of injection nozzles 58 and 58 are exposed outside the outer peripheral surface 52 c of the second rotating body 52. Further, a pair of annular recesses 52b and 52b are formed on the inner peripheral surface of the center hole 52a of the second rotating body 52 so as to sandwich each second sub-fluid passage 47a, and are fitted into each annular recess 52b. The sealed ring 49 prevents leakage of the fluid S from the second auxiliary fluid passage 47a.

  As shown in FIG. 3, the injection nozzle 57 of the first rotating body 51 and the injection nozzle 58 of the second rotating body 52 are inclined at a predetermined angle θ with respect to the shaft portion 45 (respective sub-fluid passages 46a and 47a). When the water or cement slurry fluid S is jetted from the jet nozzles 57 and 58 at a high pressure, the rotary bodies 51 and 52 rotate around the shaft portion 45 of the holder 44 by the jet force. That is, as shown in FIG. 3, when the injection force of the fluid S injected at high pressure from the injection nozzles 57 and 58 is F, it is a horizontal component of the injection force F in a plane orthogonal to the shaft portion 45 of the holder 44. F × sin θ = F ′ acts. The horizontal component force F ′ becomes a propulsive force (reaction force), and the rotating bodies 51 and 52 rotate about the shaft portion 45 of the holder 44.

  As shown in FIG. 2 (a), when the pair of spray nozzles 57, 57 for inclined drilling of the first rotary nozzle 41 is rotated and jets water S with a high pressure (jet), the spiral ( When the high-pressure jet water S in a spiral shape is jet-jetted, the excavation range of the ground 1 is widened, and a pair of jet nozzles 58 for ground improvement with the inclined second rotary nozzle 42 is provided. , 58 can jet and agitate the cement slurry S into the ground 1 easily and reliably, and the improved body K by jet injection of the cement slurry S can be easily obtained. Can be created.

  Next, the rod 30 with the first and second rotating nozzles 41 and 42 rotating in opposite directions by the reaction force of the spray force of the fluid S of the drilling water and the ground improvement cement slurry is attached to the tip 30a. The procedure for drilling the ground 1 and improving the ground by spraying the fluid S from the spray nozzles 57 and 58 of the rotary nozzles 41 and 42 into the ground 1 will be described with reference to FIGS.

  First, as shown in FIG. 5, the pair of upper chucks 22, 22 of the rod lifting drive mechanism 20 of the ground improvement device 10 is opened, the pair of lower chucks 21, 21 are closed, and the rod 30 is paired with the pair of lower chucks 21, 21. The high-pressure injection device 40 is set at a predetermined position on the ground 1 in the state of being gripped by.

  Next, as shown in FIG. 6, the pair of lower chucks 21, 21 of the rod lifting / lowering drive mechanism 20 of the ground improvement device 10 is opened, the pair of upper chucks 22, 22 are closed, and the rod 30 is gripped. Each piston rod 23b of the hydraulic cylinder 23 is retracted (contracted) to lower the pair of upper chucks 22 and 22, and the rod 30 is inserted into the ground 1 by the length of the piston rod 23b. When the rod 30 penetrates into the ground 1, as shown in FIG. 7, water (fluid) is supplied from a pair of spray nozzles 57, 57 for drilling the first rotary nozzle 41 attached to the tip 30 a of the rod 30. ) S is jetted and the rod 30 penetrates the length of the piston rod 23b while the ground 1 is loosened.

  Next, as shown in FIG. 8, after the rod 30 has penetrated the length of the piston rod 23b, the pair of upper chucks 22 and 22 are opened, the pair of lower chucks 21 and 21 are closed, and the rod 30 is paired with the pair of rods. Grip with the lower chucks 21, 21.

  Next, as shown in FIG. 9, in a state where the rod 30 is gripped by the pair of lower chucks 21 and 21, the piston rods 23b of the pair of hydraulic cylinders 23 are moved forward (elongated), so that the pair in the open state is opened. Only the upper chucks 22, 22 are raised by the length of the piston rod 23b. In the process of pulling out the rod 30, the excavated soil and the cement slurry S are agitated and mixed while jetting cement slurry (fluid) S from a pair of injection nozzles 59, 59 for ground improvement of the second rotary nozzle 42, and the ground. Improve.

  Next, the steps shown in FIGS. 5 to 9 are repeated until one rod 30 penetrates into the ground 1 to a predetermined depth, and a plurality of rods 30 are added to a predetermined depth as shown in FIG. After the penetration, the rod 30 is pulled out in the step of pulling out the rod 30 while the cement slurry (fluid) S is jetted from the pair of jet nozzles 59, 59 for ground improvement of the second rotary nozzle 42. The improved body K is created in the ground 1 by pulling out through the ground. When the cement slurry (fluid) S is jetted from the pair of jet nozzles 58, 58 of the first rotary nozzle 42 at the time of the formation, the excavated soil and the cement slurry S are more efficiently agitated.

  In this way, when the rod 30 is vertically penetrated into the ground 1 via the rod lifting / lowering drive mechanism 20 and pulled out, the fluid S jetted from the jet nozzles 57 and 58 of the rotary nozzles 41 and 42 is discharged. Since the drilling of the ground 1 and the formation of the improved body K are performed, the rod lifting and lowering drive mechanism 20 moves up and down in the vertical direction without requiring a large hydraulic cylinder and without rotating the rod 30. The ground improvement can be performed easily and reliably in a short time by the ultra-compact high-pressure injection device 40 to be moved. In addition, since the rod 30 is not rotated, a swivel or a rod rotation mechanism is not required, and accordingly, the overall structure can be simplified and the cost can be reduced.

  During the drilling of the ground 1 and the ground improvement, a pair of spray nozzles 57, 57 projecting from the front surface 51c of the first rotating body 51 of the first rotating nozzle 41 so as to make water for drilling. The ground 1 can be excavated by high-pressure injection of S, and the ground is improved by a pair of injection nozzles 58, 58 that are inclined and projected on the outer peripheral surface 52 c of the second rotating body 52 of the second rotating nozzle 42. Since the improved body K can be formed by jetting the fluid S of the cement slurry for high pressure, the diameter of the drilled hole and the improved body K can be increased as compared with the case where the drilling and forming are performed with one rotating nozzle. This can be further improved.

  Furthermore, the rotation direction (forward / reverse), speed (pressure and angle), and ejection direction of the first rotary nozzle 41 and the second rotary nozzle 42 can be changed according to the purpose. For example, the ground 1 can be drilled by speeding up the rotation of the first rotating nozzle 41, and the improved body K can be created by slowing down the rotation of the second rotating nozzle 42. In this way, the range of drilling and ground improvement can be expanded by rotating the first rotary nozzle 41 and the second rotary nozzle 42 provided in the tip 30a of the rod 30 in different directions without rotating the rod 30. Can do. That is, the pressure, flow rate, rotational direction, and speed of the jet injection of the fluid S from the spray nozzles 57 and 58 of the first rotary nozzle 41 and the second rotary nozzle 42 can be changed according to the purpose. Thus, it is possible to further increase the diameter of the drilling hole and the ground improvement as compared with the case of using the nozzle at one place of the injection rod that rotates.

  FIG. 11 is a cross-sectional view of the high-pressure injection device according to the second embodiment of the present invention.

  In the high pressure injection device 40 ′ of the second embodiment, the third rotating body 53 of the third rotating nozzle 43 is connected to the large diameter shaft portion 45 c on the proximal end side of the shaft portion 45 of the holder 44 with a pair of ball bearings 56, 56. It is different from the first embodiment in that it is rotatably supported via the first embodiment.

  That is, as shown in FIG. 11, the third rotating nozzle 43 of the high-pressure injection device 40 ′ includes a holder 44 having a shaft portion 45 formed in the center with a third main fluid passage 48A through which the fluid S flows, and a third mainstream. A pair of third sub-fluid passages 48a and 48a communicating with the body passage 48A are formed, and the third sub-fluid passages 48a and 48a rotate around the shaft portion 45 of the holder 44 in the same direction as the first rotating body 51 by the reaction force of the injection force of the fluid S. And three rotating bodies 53.

  The third main fluid passage 48 </ b> A of the holder 44 is formed to be partitioned around the second main fluid passage 47 </ b> A up to the distal end side of the large-diameter shaft portion 45 c of the shaft portion 45, and the circular hole of the lid body 31 from the inside of the rod 30. A fluid S such as water or cement slurry is supplied to the first, second and third main fluid passages 46A, 47A and 48A of the holder 44 through 31a.

  The third rotating body 53 is formed in a cylindrical shape having the same diameter as the outer diameter of the holder 44, and a center hole 53 a having a circular cross section through which the large diameter shaft portion 45 c of the holder 44 is inserted is formed at the center. . The pair of third sub-fluid passages 48a and 48a communicated with the third main fluid passage 48A of the third rotating body 53 are formed in a straight line, and a pair of injection nozzles 59 and 59 are provided at the respective tip ends thereof. The third sub fluid passages 48a are attached with an inclination at a predetermined angle. Further, a pair of annular recesses 53b, 53b are formed on the inner peripheral surface of the center hole 53a of the third rotating body 53 so as to sandwich each third sub-fluid passage 48a, and fitted into each annular recess 53b. The sealed ring 49 prevents the fluid S from leaking from the third auxiliary fluid passage 48a. Since other configurations are the same as those of the first embodiment, the same components as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As described above, according to the apparatus of the second embodiment, the same operation and effect as those of the first embodiment can be obtained. Further, when the ground is improved by pulling out the rod 30 from the ground 1, the rotation direction and the injection direction are different. The rotary nozzle 42 and the pair of injection nozzles 58 and 58 and the third rotary nozzle 43 and the pair of injection nozzles 59 and 59 can further pulverize and refine the excavated soil, and the excavated soil and the cement slurry S can be further refined. The stirring efficiency can be further improved.

  FIG. 12 is a cross-sectional view of the high-pressure injection device according to the third embodiment of the present invention, FIG. 13 is an explanatory view showing a state when the ground is improved by the high-pressure injection device, and FIG. It is a perspective view which shows a part.

  The high pressure injection device 40 ″ of the third embodiment includes a third rotating nozzle 43 that rotates on a large diameter shaft portion 45 c on the proximal end side of the shaft portion 45 of the holder 44 via a pair of ball bearings 56, 56. On the rear surface 53d side of the rotating body 53, a pair of injection nozzles 59 'and 59' for discharging the drilling sludge are provided so as to protrude at a predetermined angle with respect to the third sub-fluid passages 48a '. , Different from the second embodiment.

  Further, the high pressure injection device 40 ″ of the third embodiment has a small and medium diameter that expands and contracts in the horizontal direction attached to the lower end (tip) 5a of the elevating casing 5 that moves up and down along a leader of a ground improvement device (not shown). Are attached to the tip 30a of a small-diameter rod 33 on the front side of each large-diameter rod 30, 32, 33. Each rod 30, 32, 33 is slidably inserted and secured to the large-diameter rod 33. The lower end 5a of the elevating casing 5 is connected to the rod 33 having a diameter, and the large diameter rod 33 is caused by the fluid pressure of the fluid S flowing from the pipe 6 in the elevating casing 18 into each rod 30, 32, 33. On the other hand, the medium diameter and small diameter rods 32 and 30 extend, and the medium diameter and small diameter rods 32 and 30 extend with respect to the large diameter rod 33. 8 is that the medium-diameter and small-diameter rods 32 and 30 are retracted with respect to the large-diameter rod 33 and are accommodated in the large-diameter rod 33. Since the other configuration is the same as that of the second embodiment, the same components as those of the second embodiment are denoted by the same reference numerals and detailed description thereof is omitted.

  As described above, according to the high pressure injection device 40 ″ of the third embodiment, the large-diameter rod 33 attached to the lower end 5a of the elevating casing 5 is predetermined in the hole 1a formed in the ground 1 as shown in FIG. The water S as a fluid is supplied from the pipe 6 to the depth, and a large-diameter rod as shown in Fig. 13 by the water pressure when the water S is discharged from the pipe 6 into the rods 30, 32, 33. The medium diameter and small diameter rods 32 and 30 extend in the horizontal direction with respect to 33 while drilling the side wall of the hole 1a dug in the ground 1. At this time, the small diameter rod 30 is attached to the tip 30a. The pair of spray nozzles 57, 57 of the first rotary nozzle 41 of the high-pressure spray device 40 ″ sprays water S at a high pressure (jet).

  Spiral (spiral) high-pressure jet water S is jetted from a pair of jet nozzles 57, 57 provided on the front surface 51 c of the first rotary body 51 of the first rotary nozzle 41. The drilling range of the side wall of the hole portion 1a is widened. At this time, the high-pressure injection device is configured such that the fluid S such as air is jet-injected from a pair of injection nozzles 59 ′ and 59 ′ inclined and projected from the rear surface 53 d of the third rotator 53 of the third rotation nozzle 43. It is possible to facilitate the 40 ″ penetration input and promote the discharge of mud generated by drilling, and excavation can be performed easily and reliably in a short time.

  Then, after the horizontal drilling of the side wall of the hole 1 a of the ground 1, the cement slurry S as a fluid is switched and supplied from the pipe 6. In this case, since the high-pressure injection cement slurry S is jet-injected from a pair of injection nozzles 58, 58 provided to be inclined with respect to the outer peripheral surface 52 c of the second rotary body 52 of the second rotary nozzle 42, The cement slurry S can be easily and surely jetted into the cavity 3 directly under the existing structure 2 in FIG. 1, and the improved body K and the bottom surface of the existing structure 2 can be easily adhered by jetting the cement slurry S. It can be carried out. At this time, the high pressure injection cement slurry S may be jet-injected spirally (spirally) from the pair of injection nozzles 57 57 of the first rotating nozzle 41.

  And after the ground improvement just under the existing structure 2 in the ground 1, by winding the wire 8 with the electric winch 7 while removing the fluid S of the cement slurry from the elongated rods 30, 32, 33, The medium diameter and small diameter rods 32 and 30 are retracted with respect to the large diameter rod 33, and the medium diameter and small diameter rods 32 and 30 are accommodated in the large diameter rod 33. Next, by pulling up the rods 30, 32, 33 attached to the lower end 5a of the lifting casing 15 from the hole 1a of the ground 1, the lower (lower) ground improvement work is completed. Then, by repeating this ground improvement work upward (upward) sequentially, as shown in FIG. 14, the improvement body K is carried out in the form of a horizontally long dumpball to the position immediately below the existing structure 2 in the ground 1 and immediately below the existing structure 2. To improve the ground.

  As described above, the large diameter of each of the rods 30, 32, 33 that has a fluid passage through which the fluid S such as water or cement slurry flows in the lower end 5a of the elevating casing 5 of the ground improvement device and expands and contracts in the horizontal direction. The rod 33 is attached to the tip 30a of the small-diameter rod 30, and the high-pressure injection device 40 ″ provided with the rotating nozzles 41, 42, 43 rotated by the reaction force F ′ of the injection force F of the fluid S is attached. , 32 can be extended in the horizontal direction by the fluid pressure of the fluid S jetted at a high pressure from the jet nozzles 57, 58, 59 ′ of the rotary nozzles 41, 42, 43, as shown in FIGS. When there is a cavity 3 immediately below the existing structure 2 in the ground 1, drilling and ground improvement can be performed in a short time while extending the rods 30 and 32 horizontally to the cavity 3 immediately below the existing structure 2. To do It is. Accordingly, it is possible to further further expand the scope and range of ground improvement in drilling the ground 1.

  Further, a third rotating nozzle 43 is provided on the rear side of the drilling hole, and fluid S such as air is supplied from a pair of jet nozzles 59 ′ and 59 ′ that are inclined and projected on the rear surface 53 d of the third rotating body 53. By jet injection, it is possible to assist the penetration input and to discharge the mud generated by the drilling.

  In addition, according to each said embodiment, although cement slurry was used as a solidification material, a solidification material is not restricted to a cement slurry. Moreover, although a pair of injection nozzles are inclined and protruded on each rotating body, three or more injection nozzles may be inclined and protruded.

DESCRIPTION OF SYMBOLS 1 Ground 30 Rod 30a Tip 40, 40 ', 40 "High pressure injection device 41 1st rotation nozzle (rotation nozzle)
42 Second rotating nozzle (rotating nozzle)
43 3rd rotating nozzle (Rotating nozzle)
44 Holder 45 Shaft 46A First Main Fluid Passage (Main Fluid Passage)
46a First sub-fluid passage (sub-fluid passage)
47A Second main fluid passage (main fluid passage)
47a Second sub-fluid passage (sub-fluid passage)
48A Third main fluid passage (main fluid passage)
48a Third sub-fluid passage (sub-fluid passage)
51 First Rotating Body (Rotating Body)
52 Second Rotating Body (Rotating Body)
53 Third Rotating Body (Rotating Body)
57 Spray nozzle for drilling 58, 59 Spray nozzle for ground improvement 59 'Spray nozzle for discharging drilling mud S Water or cement slurry (fluid)
K improved body F injection force F 'reaction force θ inclination angle

Claims (5)

In the high-pressure injection device that performs high-pressure injection of fluid from the injection nozzle provided on the rod in the ground and performs drilling and improvement of the ground,
A rod that supplies the fluid; and a plurality of rotating nozzles that are provided at a tip of the rod and that are rotated by a reaction force of the ejection force of the fluid,
A high-pressure spraying device, wherein spray nozzles for spraying the fluid at high pressure are provided on the plurality of rotating nozzles, respectively. The high-pressure injection device according to claim 1,
A high-pressure jetting device characterized in that the rotation directions of the plurality of rotary nozzles are different. The high-pressure injection device according to claim 1 or 2,
Two high-pressure jet nozzles are provided at the tip of the rod, the jet nozzle of one rotary nozzle on the tip side is for drilling, and the jet nozzle of the other rotary nozzle is for ground improvement . The high-pressure injection device according to claim 1 or 2,
Three rotating nozzles are provided at the tip of the rod, the injection nozzle of the rotating nozzle on the tip side is for drilling, the injection nozzle of the intermediate rotating nozzle is for ground improvement, and the injection nozzle of the rear rotating nozzle is A high-pressure spraying device characterized in that it is used for ground improvement or discharge of drilling mud. The high-pressure injection device according to any one of claims 1 to 4,
The plurality of rotating nozzles are:
A holder formed up to a shaft portion in which a main fluid passage through which the fluid flows projects to the center;
A sub-fluid passage communicating with the main fluid passage, and a rotating body that rotates about the shaft portion of the holder,
The sub-fluid passage of the rotating body is provided at a predetermined angle with respect to the main fluid passage, and an injection nozzle is attached to the sub-fluid passage.
A high-pressure jetting device characterized in that the rotating body is rotatable by a reaction force of the jetting force of the fluid jetted from the jet nozzle.

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