JP2018150774A - High pressure injection device and high pressure injection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a super-compact type high pressure injection device which dispenses with a swivel and a rod rotary mechanism, and can be constructed even on a narrow place or a slope surface where a foothold is not installed.SOLUTION: A high pressure injection device 10 which excavates and improves a ground 1 by high pressure injecting water or a fluid of a cement slurry from injection nozzles 48, 55 and 58 provided on a rod 30 in the ground 1 includes: a device body 11 which holds the rod 30 in a standing state; and a rod lifting/driving mechanism 20 which is mounted on the device body 11 and intrudes/pulls out the rod 30 to/from the ground 1 without rotation of the rod, where a rotary nozzle 40 rotating by a reaction force of an injection force of the fluid is provided on a tip 30a of the rod 30, the rod 30 is intruded into the ground 1 through the rod lifting/driving mechanism 20, and when the rod is pulled out, the ground 1 is excavated and improved through the fluid high-pressure injected from the injection nozzles 48, 55 and 58 of the rotary nozzle 40.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an ultra-compact high-pressure injection device and a high-pressure injection method for excavating and improving the ground by high-pressure injection of water and a solidified material into 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 is rotated and penetrated into the ground, and when a predetermined depth is reached, a cement slurry is injected at a high pressure from a nozzle provided at the side wall of the tip of the rod to form a cylindrical improvement body. This is a construction method.

JP 2007-56477 A JP 2002-227179 A

  However, in the conventional high-pressure injection method, it is necessary to rotate the injection rod, so a swivel and rod rotation mechanism is indispensable, and even a small one uses a boring machine, and a boring machine is installed. In addition, it needed a space where the fence can be assembled. Furthermore, preparation steps such as leveling of scaffolding were indispensable for installing construction machines.

  Accordingly, the present invention has been made to solve the above-described problems, and does not require a swivel or a rod rotating mechanism, and can be applied to a narrow area or a slope where a scaffold is not maintained, and can be applied to an ultra-compact high-pressure jet. An object is to provide an apparatus and a high-pressure injection method.

  A high-pressure jetting apparatus for excavating and improving a ground by jetting a fluid from a jet nozzle provided on the rod in the ground of the present invention includes a rod for supplying the fluid, and a device for holding the rod in an upright state A rotation mechanism that is attached to the apparatus body and includes a rod lifting / lowering drive mechanism that penetrates and pulls out of the ground without rotating the rod, and rotates at the tip of the rod by the reaction force of the fluid injection force A nozzle is provided, and an injection nozzle that injects the fluid at a high pressure is provided on the rotary nozzle, and the rod is penetrated into the ground via the rod lifting / lowering drive mechanism, and is ejected from the rotary nozzle at a high pressure when the rod is pulled out. The gist is that the ground is excavated and improved via a fluid.

  Further, in the high pressure injection method of excavating and improving the ground by injecting the fluid from the injection nozzle provided on the rod into the ground of the present invention, the rotating nozzle that rotates by the reaction force of the fluid injection force is provided at the tip. When the rod is inserted into the ground via the rod lifting / lowering drive mechanism, the rod is fixed while the drilling fluid is sprayed from the spray nozzle of the rotating nozzle to loosen the ground. The gist is to penetrate to a depth, and then pull out the rod through the rod lifting / lowering drive mechanism while ejecting the fluid for improvement from the spray nozzle of the rotating nozzle to create an improved body in the ground. .

  According to the high-pressure injection device of the present invention, a rotary nozzle that rotates by the reaction force of the fluid injection force is provided at the tip of the rod, and when the rod penetrates into the ground via the rod lifting / lowering drive mechanism, Since the excavation and improvement of the ground is performed through the fluid jetted from the high-pressure jet nozzle, the swivel and the rod rotation mechanism become unnecessary because the rod does not penetrate into or pull out from the ground while rotating. In addition, construction can be performed easily and reliably even on narrow slopes or slopes where scaffolds are not provided.

  Furthermore, according to the high pressure injection method of the present invention, when using a rod attached to the tip of a rotating nozzle that rotates by the reaction force of the fluid injection force, when penetrating the rod into the ground via the rod lifting drive mechanism, The rod is penetrated to a predetermined depth while discharging the drilling fluid from the injection nozzle of the rotary nozzle to loosen the ground, and then the rod is driven up and down while the fluid for improvement is injected from the injection nozzle of the rotary nozzle By pulling out through the base and creating an improved body in the ground, the ground can be improved easily and reliably in a short time by the ultra-compact high-pressure injection device that moves up and down without rotating the rod. In addition, since the rod does not rotate, a swivel or a rod rotation mechanism is not required, so that the cost can be reduced, and construction can be performed easily and reliably even in narrow spaces or slopes where scaffolding is not maintained. It can be carried out.

It is a side view of the high-pressure injection device of a 1st embodiment of the present invention. It is sectional drawing of the rotating nozzle attached to the front-end | tip of the rod of the said high pressure injection apparatus. It is a front view of the said rotation nozzle. It is sectional drawing which follows the XX line in FIG. It is explanatory drawing which shows the rotation principle of the said rotation nozzle. (A) is explanatory drawing of the injection flow of the injection nozzle provided in the front of the said rotation nozzle, (b) is explanatory drawing of the injection flow of the injection nozzle provided in the outer peripheral surface of the rotation nozzle. It is explanatory drawing which shows the state which opened the upper chuck | zipper of the said high voltage | pressure injection 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 a side view which shows the state before constructing, after mounting the said high voltage | pressure injection apparatus on the fork of a forklift and drive | working a public road. It is a side view which shows the state before attaching and constructing | attaching the said high pressure injection apparatus to the arm of a backhoe. It is a top view which shows the state which constructs the narrow space between structures with the said backhoe. It is a side view which shows the state which constructs an inclined ground with the said backhoe. It is a side view which shows the state which constructs the ground underwater or the sea with the said backhoe. It is a side view of the high pressure injection device of a 2nd embodiment of the present invention. It is a side view which shows the state before attaching and constructing the high pressure injection apparatus of the said 2nd Embodiment to the arm of a backhoe.

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

  1 is a side view of a high-pressure injection device according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view of a rotary nozzle attached to the tip of a rod of the high-pressure injection device, and FIG. 3 is a front view of the rotary nozzle. 4 is a cross-sectional view taken along line XX in FIG. 2, FIG. 5 is an explanatory view showing the rotation principle of the same rotating nozzle, and FIG. 6A is an explanation of the injection flow of the injection nozzle provided in front of the same rotating nozzle. FIG. 6 and FIG. 6B are explanatory views of the injection flow of the injection nozzle provided on the outer peripheral surface of the same rotating nozzle, and FIGS. 7 to 12 are explanatory views sequentially showing the high-pressure injection method by the high-pressure injection device. .

  As shown in FIG. 1, the high-pressure injection device 10 has a rotating nozzle 40 that rotates (rotates) due to a reaction force of the injection force of the fluid S injected at a high pressure from the injection nozzles 48, 55, and 58, which will be described later, attached to the tip 30 a. The rod 30 is mounted between the pair of brackets 12 and 12 and the pedestal (device main body) 11 that holds the rod 30 in a substantially vertical standing state via the pair of brackets 12 and 12, and rotates the rod 30. And a rod raising / lowering drive mechanism 20 that penetrates and withdraws into the ground 1 without fluid, and a fluid supply hose 33 that supplies excavating water and a fluid S for improving cement slurry (solidifying material) into the rod 30. The micro 1 is excavated (drilled) and improved by injecting the fluid S into the ground 1 from the injection nozzles 48, 55, 58 of the rotary nozzle 40 at the tip 30a of the rod 30 by high pressure. It is intended. That is, a fluid supply hose 33 is inserted into the cylindrical rod 30 to supply a fluid S that is pumped from a water tank or plant (not shown) via a pump. Using the injection force of the water pumped by this pump and the solidified material, the rotary nozzle 40 is rotated, and the ground 1 is excavated by jet water injected from the injection nozzles 48, 55, 58 of the rotary nozzle 40, The rod 30 is penetrated into the ground 1 and the improved body K is formed by cement slurry injected from the injection nozzles 48, 55 and 58. As shown in FIG. 7, an opening hole 11 a through which the rod 30 and the rotary nozzle 40 pass is formed in the center of the base 11.

  As shown in FIG. 1, the rod lifting / lowering drive mechanism 20 grips a pair of lower chucks 21, 21 that grip the tip 30 a side of the rod 30, and the upper side (the middle part of the rod 30) from the tip 30 a side of the rod 30. A pair of upper chucks 22 and 22 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.

  The tip 30a of the rod 30 is provided with a rotating nozzle 40 that rotates due to the reaction force of the injection force of the fluid S. That is, as shown in FIG. 2, a cylindrical lid 31 is fixed to the tip 30 a of the rod 30. A screw hole 31a is formed in the center of the lid body 31, and a rotating nozzle 40 that is rotated by the reaction force of the jetting force of the fluid S is attached to the tip 30a of the rod 30 through the screw hole 31a. Yes.

  As shown in FIGS. 2 to 4, the rotary nozzle 40 includes a holder 41 formed up to a shaft portion 42 projecting from the main fluid passage 43 through which the fluid S flows, and a sub-fluid passage communicating with the main fluid passage 43. 53 is formed of a rotating body 51 that rotates around the shaft portion 42 of the holder 41 by the reaction force of the jetting force of the fluid S.

  The holder 41 is formed in a large-diameter columnar shape, and a small-diameter columnar shaft portion 42 is integrally formed at the center of the front surface thereof. A rotating body 51 is rotatably supported on the shaft portion 42 via a ball bearing 45 and a pair of dry bearings 46 and 46.

  The main fluid passage 43 of the holder 41 includes a large-diameter surface portion 43a in which a screw hole is formed on the inner peripheral surface from the bottom surface side of the holder 41, a conical surface portion 43b, and a small-diameter surface portion 43c formed on the shaft portion 42 side. ing. And the screw part 47a formed in the front side of the outer peripheral surface of the cylindrical connection cylinder 47 is screwed together by the screw hole of the large diameter surface part 43a. Further, as shown in FIG. 2, the screw portion 47 b formed on the rear side of the outer peripheral surface of the cylindrical connecting cylinder 47 is screwed into the screw hole 31 a of the lid 31. Thus, water or cement slurry fluid S is supplied from the rod 30 to the main fluid passage 43 of the holder 41.

  Further, as shown in FIGS. 2 and 4, in the middle of the small diameter surface portion 43 c of the main fluid passage 43, four communication passages 44 communicating with the sub fluid passage 53 of the rotating body 51 are formed in a cross shape. As shown in FIG. 2, a tip end 43d as a screw hole is formed at the tip of the main fluid passage 43 formed up to the shaft portion 42, and an injection nozzle 48 is attached to the tip end 43d. It has been.

  The rotating body 51 is formed in a cylindrical shape having the same diameter as the outer diameter of the holder 41, and a central hole 52 having a circular cross section through which the shaft portion 42 of the holder 41 is inserted is formed at the center.

  As shown in FIGS. 2 to 4, the sub-fluid passage 53 of the rotating body 51 includes an annular passage 53 a that communicates with the main fluid passage 43 of the holder 41 through four communication passages 44, and an outer peripheral side from the annular passage 53 a. And three branch passages 53b formed radially toward the surface. As shown in FIG. 2, a pair of annular recesses 52a and 52a are formed in the center hole 52 of the rotating body 51 so as to sandwich the annular passage 53a of the sub-fluid passage 53, and each annular recess 52a The fitted seal ring 54 prevents the fluid S from leaking from the annular passage 53a. Further, an injection nozzle 55 is attached to the tip end of each branch passage 53b.

  As shown in FIGS. 2 and 3, the rotating body 51 has injection holes (fluid passages) 56 communicating with the respective branch passages 53 b of the sub-fluid passage 53 in a three-dimensional manner with respect to the main fluid passage 43. Three are formed radially from the respective branch passages 53b of the sub-fluid passage 53 toward the outer peripheral side by inclining the angle θ. As shown in FIG. 4, the base end port 56b of the injection hole 56 is connected to the branch passage 53b.

  As shown in FIG. 2, since the injection hole 56 of the rotating body 51 is inclined by a predetermined angle θ, water or cement slurry fluid S is injected from the injection nozzle 58 attached to the tip end port 56 a of the injection hole 56 at a high pressure. When this is done, the rotating body 51 is rotated about the shaft portion 42 of the holder 41 by this injection force. That is, as shown in FIG. 5, when the injection force of the fluid S injected at high pressure from the injection nozzle 58 is F, F × which is a horizontal component of the injection force F in the plane orthogonal to the shaft portion 42 of the holder 41. sin θ = F ′ acts. The horizontal component force F ′ becomes a propulsive force (reaction force), and the rotating body 51 rotates about the shaft portion 42 of the holder 41. Further, as shown in FIG. 6B, the injection force of the fluid S from a plurality of (for example, three) injection nozzles 55 attached to the outer peripheral surface 51a of the rotary body 51 of the rotary nozzle 40 at equal intervals is also a rotary body. 51 is a driving force when rotating around the shaft portion 42 of the holder 41.

  As shown in FIGS. 2 and 3, each of the tip openings 56a of the three injection holes 56 of the rotating body 51 is a screw hole, and an injection nozzle 58 is attached to one of the tip openings 56a. A blocking plug 59 is attached to the distal end port 56 a of the remaining other injection holes 56.

  Further, as shown in FIG. 2, a rotation sensor 60 that detects the rotation state of the rotating body 51 is provided on the front surface 41 a side of the holder 41 and the rear surface 51 b side of the rotating body 51 facing the front surface 41 a. The rotation sensor 60 includes a proximity switch 61 made of a semiconductor MR element or the like attached to the rear surface 51b side of the rotating body 51, and a plurality of sheet-like magnets (permanent magnets) attached to the front surface 41a side of the holder 41 at equal intervals. 62). The rotation sensor 60 detects whether the rotating body 51 is rotating or stopped, so that the rotating state of the rotating body 51 during ground improvement can be easily and reliably confirmed.

  As shown in FIG. 6A, when the water S is jetted at a high pressure (jet) while the jet nozzles 48 and 58 of the rotary nozzle 40 rotate, the jet nozzle of the shaft portion 42 of the holder 41 of the rotary nozzle 40. The linear high-pressure jet water S1 is jet-injected from 48 and spiral (spiral) from the jet nozzle 58 inclined to the outer peripheral side of the rotating body 51 of the rotary nozzle 40 around the straight high-pressure jet water S1. The high-pressure jet water S2 is jet-jetted, so that the tip of the linear high-pressure jet water S1 functions like the tip of a so-called twist drill, and the spiral high-pressure jet water S2 is a so-called twist drill spiral. Therefore, the ground 1 can be excavated in a straight and round shape easily and reliably. Further, the high-pressure jet water S1 is jetted spirally while the inclined jet nozzle 58 rotates, so that the excavation range of the ground 1 is widened.

  Further, when the cement slurry S as a fluid is jetted from the rotary nozzle 40 at a high pressure, the linear high-pressure jet cement slurry S1 is jet-jetted from the jet nozzle 48 at the center of the rotary nozzle 40, and this linear high-pressure jet is used. Since the spiral high-pressure injection cement slurry S2 is jet-injected from the injection nozzle 58 inclined to the outer peripheral side of the rotary nozzle 40 with the cement slurry S1 as the center, the cement slurry S can be easily and surely jetted into the ground 1. The improved body K by jet injection of the cement slurry S can be easily created.

  Next, the injection nozzle 48 of the rotation nozzle 40 is inserted into the ground 1 by using the rod 30 having the rotation nozzle 40 that is rotated by the reaction force of the injection force of the water S for excavation and the fluid S of the cement slurry for improvement. , 55 and 58, a high-pressure injection method for excavating (boring) and improving the ground 1 by high-pressure injection of the fluid S will be sequentially described with reference to FIGS.

  First, as shown in FIG. 7, the pair of upper chucks 22, 22 of the rod lifting / lowering drive mechanism 20 is opened, the pair of lower chucks 21, 21 is closed, and the rod 30 is gripped by the pair of lower chucks 21, 21. The high pressure injection device 10 is set at a predetermined position on the ground 1.

  Next, as shown in FIG. 8, the pair of lower chucks 21, 21 of the rod lifting / lowering drive mechanism 20 is opened, the pair of upper chucks 22, 22 are closed, and the rod 30 is gripped. Each piston rod 23b 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 penetrating the rod 30 into the ground 1, as shown in FIG. 9, water (fluid) S for excavation is supplied from the injection nozzles 48, 55, 58 of the rotary nozzle 40 attached to the tip 30 a of the rod 30. The jet 30 is jetted to penetrate the rod 30 by the length of the piston rod 23b while loosening the ground 1.

  Next, as shown in FIG. 10, after inserting the rod 30 by 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. 11, in a state where the rod 30 is gripped by the pair of lower chucks 21, 21, the piston rods 23 b of the pair of hydraulic cylinders 23 are moved forward (elongated) to open the pair in the open state. Only the upper chucks 22, 22 are raised by the length of the piston rod 23b.

  Next, each process shown in FIGS. 7 to 11 is repeated until one rod 30 penetrates into the ground 1 to a predetermined depth. As shown in FIG. 12, a plurality of rods 30 are added to a predetermined depth. After the penetration, the rod 30 is pulled through the rod lifting / lowering drive mechanism 20 while jetting the cement slurry (fluid) S for improvement from the jet nozzles 48, 55, 58 of the rotary nozzle 40 in the step of pulling out the rod 30. Pull out to create an improved body K in the ground 1.

  Thus, when the rod 30 is vertically penetrated into the ground 1 through the rod lifting / lowering drive mechanism 20 and pulled out, the fluid S is jetted from the ejection nozzles 48, 55, 58 of the rotary nozzle 40. The excavation of the ground 1 and the creation of the improved body K do not require a large hydraulic cylinder, and the rod is lifted up and down in the vertical direction by the rod lifting drive mechanism 20 without rotating the rod 30. Ground improvement can be performed easily and reliably in a short time with the small high-pressure injection device 10. Further, since the rod 30 is not rotated, a swivel or a rod rotating mechanism is not required, and the cost can be reduced accordingly.

  Further, as shown in FIG. 13, if a fork 71 for loading the load of the forklift 70 is inserted into the lateral hole 11 b formed in the base 11 of the ultra-compact high-pressure injection device 10, it can be transported by traveling on a public road. It is possible to carry out excavation of the ground 1 and creation of the improved body K by simply transporting it to the place where it is constructed.

  Furthermore, as shown in FIGS. 14 to 17, the ultra-compact high-pressure injection device 10 can be used by being attached to the tip 81 a of the arm 81 of the backhoe 80 via a pair of attachments 13 and 13. In this case, a column 14 that guides the fluid supply hose 33 into the cylindrical rod 30 is erected in the center of the base 11 of the high-pressure injection device 10. Further, a reel 15 that winds up or feeds out the fluid supply hose 33 is attached between the pair of attachments 13 and 13 of the base 11.

  Thereby, as shown in FIG. 15, a narrow space between the structures 5 and 5 can be constructed by the ultra-compact high-pressure injection device 10 attached to the tip 81 a of the arm 81 of the backhoe 80. That is, since the ultra-compact high-pressure injection device 10 is about the width of the bucket attached to the tip 81a of the arm 81 of the backhoe 80, construction in a confined area where a boring machine could not be placed is possible. It becomes.

  Further, as shown by the one-dot chain line in FIG. 16, the arm 81 of the backhoe 80 can be installed with the base 11 of the ultra-compact high-pressure injection device 10 suspended in the air. Then, the improved body K ′ can be created without constructing a scaffold on the middle of the slope of the slope 2. Further, as shown by a two-dot chain line in FIG. 16, by operating the arm 81 so as to incline the base 11 of the ultra-compact high-pressure injection device 10 attached to the tip 81 a of the arm 81 of the backhoe 80, An oblique improvement K ″ can be created.

  Further, as shown in FIG. 17, the improved body K can be created on the ground 3 underwater or underwater by the ultra-compact high-pressure injection device 10 attached to the tip 81 a of the arm 81 of the backhoe 80.

  FIG. 18 is a side view of the high-pressure injection device according to the second embodiment of the present invention, and FIG. 19 is a side view showing a state before the high-pressure injection device is attached to the arm of the backhoe.

  As shown in FIG. 18, the high-pressure injection device 10 'rotates (rotates) by the reaction force of the injection force of the fluid S injected at high pressure from the injection nozzles 48, 55, 58 to the tip 30a, as in the first embodiment. ) Between the pair of brackets 12 and 12, the rod 30 to which the rotating nozzle 40 is attached, the pedestal (device main body) 11 that holds the rod 30 in a substantially vertical standing state via the pair of brackets 12 and 12. A rod lifting / lowering drive mechanism 20 ′ that is attached and penetrates / withdraws into the ground 1 without rotating the rod 30, and supplies water S for excavation and a cement slurry (solidification material) for improvement into the rod 30. And a fluid supply hose 33.

  The rod lifting / lowering drive mechanism 20 ′ is rotatably supported between a pair of racks 25, 25 provided on both sides of the outer peripheral surface of the rod 30 and the pair of brackets 12, 12. Hydraulic motors (motors) that rotate a pair of upper and lower pinions 26, 26, 27, 27 that are meshed with each other and one pinion 27 of the lower pair of pinions 27, 27 via an intermediate gear 29. 28. That is, the drive gear 28 a of the hydraulic motor 28 is meshed with one pinion 27 of the pair of lower pinions 27, 27 via the intermediate gear 29.

  Thus, the same operation and effect as in the first embodiment can be obtained, and the rod 30 can be vertically penetrated into the ground 1 via the rod lifting / lowering drive mechanism 20 'and can be pulled out. Since it does not penetrate or withdraw in the vertical direction into the ground 1 while being rotated, a swivel or a rod rotating mechanism becomes unnecessary, and the cost can be reduced correspondingly.

  Further, as shown in FIG. 19, if an ultra-compact high-pressure injection device 10 ′ is attached to the tip 81a of the arm 81 of the backhoe 80 via a pair of attachments 13 and 13 and used, as in the first embodiment. In addition, construction can be performed easily and reliably even on narrow slopes or slopes of slopes where scaffolding is not provided.

  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. In addition, an ultra-small high-pressure injector was attached to the tip of the backhoe arm instead of the bucket, but an ultra-small high-pressure injector was attached to the tip of the small excavator arm instead of the backhoe. May be.

1 Ground 10, 10 'High-pressure injection device 11 Base (device body)
20, 20 'Rod lifting drive mechanism 21 Lower chuck 22 Upper chuck 23 Hydraulic cylinder (cylinder)
25 rack 26, 27 pinion 28 hydraulic motor (motor)
30 Rod 30a Tip 40 Rotating nozzle 41 Holder 42 Shaft 43 Main fluid passage 43d Tip port 48 Injection nozzle 51 Rotating body 51a Outer peripheral surface 53 Sub fluid passage 55 Injection nozzle 56 Injection hole 56a Tip port 58 Injection nozzle 58c Tip port 59 Blocking plug 70 Forklift 71 Fork 80 Backhoe 81 Arm 81a Tip S Water or cement slurry (fluid)
K, K ', K "Improved body F Injection force F' Reaction force θ Inclination angle

Claims (8)

In a high-pressure injection device that excavates and improves the ground by injecting a high-pressure fluid from an injection nozzle provided on a rod in the ground,
A rod that supplies the fluid; a device main body that holds the rod in an upright state; and a rod lifting and lowering drive mechanism that is attached to the device main body and penetrates and pulls into the ground without rotating the rod.
A rotary nozzle that rotates by a reaction force of the fluid jet force is provided at the tip of the rod, and a jet nozzle that jets the fluid at a high pressure is provided at the rotary nozzle, and the rod is inserted into the ground via the rod lifting drive mechanism. The high-pressure jetting apparatus is characterized by excavating and improving the ground through the fluid jetted at a high pressure from the jet nozzle of the rotary nozzle when penetrating into and pulling out. The high-pressure injection device according to claim 1,
The rotating nozzle is
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,
In the rotating body, a plurality of injection holes communicating with the sub-fluid passage are inclined at a predetermined angle with respect to the main fluid passage and radially formed from the sub-fluid passage toward the outer peripheral side,
Attaching an injection nozzle to at least one of the front end ports of the plurality of injection holes and attaching a closing plug to the front end port of the other injection hole,
Further, a tip opening is formed at the tip of the shaft portion of the main fluid passage of the holder, an injection nozzle is attached to the tip opening, and injection is performed from the injection nozzle attached to the tip opening of the injection hole around the injection nozzle. A high-pressure jetting device characterized in that the rotating body is made rotatable by a reaction force of the jetting force of the fluid. The high-pressure injection device according to claim 2,
At least one pair of said injection nozzle is attached to the outer peripheral surface of the said rotary body at predetermined intervals, The high pressure injection apparatus characterized by the above-mentioned. The high-pressure injection device according to claim 1,
The rod raising / lowering drive mechanism is composed of a lower chuck for gripping the tip end side of the rod, an upper chuck for gripping the upper side from the tip end side of the rod, and a cylinder for raising and lowering the upper chuck holding the rod. A high pressure injection device characterized by that. The high-pressure injection device according to claim 1,
The rod raising / lowering drive mechanism comprises a rack provided on an outer peripheral surface of the rod, a pinion that meshes with the rack and rotates, and a motor that rotates the pinion. . It is a high-pressure injection device given in any 1 paragraph of Claims 1-5,
A high-pressure jetting device characterized in that the device main body is placed on a fork for loading a load of a forklift. It is a high-pressure injection device given in any 1 paragraph of Claims 1-5,
A high-pressure spraying device characterized in that the device main body is attached to the tip of a backhoe arm. In the high-pressure injection method of excavating and improving the ground by injecting a high-pressure fluid from the injection nozzle provided on the rod in the ground,
When a rod having a rotating nozzle that is rotated by a reaction force of the fluid jet force is attached to the tip of the rod and penetrating into the ground via a rod lifting drive mechanism, the jet nozzle of the rotary nozzle is used for excavation. The rod is penetrated to a predetermined depth while the ground is loosened by jetting the fluid, and then the rod is pulled out via the rod lifting / lowering driving mechanism while jetting the fluid for improvement from the jet nozzle of the rotary nozzle. A high-pressure injection method characterized in that an improved body is created in the ground.

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