JP3614211B2 - Injection device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides a solidified pile in the ground by the combined use of a high-pressure jet jet and mechanical agitation, and is provided on a stirring blade attached at intervals in the longitudinal direction of a pipe inserted into the ground, and a hardener or Using at least two nozzle devices for ejecting a high-pressure jet of water and an air jet covering the high-pressure jet, these nozzle devices are adjustable in the injection angle, depending on the finished pile diameter of the consolidated pile to be built The present invention relates to an injection device for controlling the finished pile diameter by adjusting and intersecting the injection angle of a nozzle device.
[0002]
[Prior art]
A construction method for improving the ground by forming a consolidated pile in the ground by using a combination of high-pressure jet jet and mechanical stirring is known.
[0003]
In such a construction method, several stages of stirring blades are provided around the pipe without directly jetting the high-pressure jet jet from the pipe inserted into the ground, and a low-pressure hardening material is discharged from the vicinity of the center of the pipe. Agitation at a certain distance is agitated by mechanical agitation, and further, a high-pressure jet of water or a hardened material is sprayed from the tip or middle of the agitating blade to form a consolidated pile, that is, a circular pile.
[0004]
In the above-described construction method, a circular tubular pile having a predetermined thickness is added to the outside of the pile formed by the stirring blade, but it is desirable that the predetermined thickness can be selected according to the situation. For this reason, it is necessary to control the reach of the jet.
[0005]
By the way, when injecting a high-pressure jet jet into the ground, the reach of the jet jet differs depending on the soil and soil properties (strength, water content ratio, gap ratio), so conventionally water or hardener is injected with excessive power, There was a tendency to prioritize ensuring a large finished pile diameter. For this reason, there existed problems, such as loss of material and a large amount of slime outflow.
[0006]
Therefore, in the Japanese Patent Application No. Hei 6-39986, the present applicant can easily control the reach distance of the jet jet, and can select the predetermined thickness of the created pile according to the situation. A control method of finished pile diameter in solid pile making to solve the inconvenience such as loss of steel was proposed.
[0007]
According to the proposal, when a consolidated pile is formed in the ground by using both a high-pressure jet jet and mechanical stirring, it is provided on a stirring blade attached with a space in the longitudinal direction of a pipe to be inserted into the ground. Or at least two nozzles that eject a high-pressure jet of water and an air jet covering the high-pressure jet, these nozzles are adjustable in injection angle, and the injection angle of the nozzle is adjusted according to the reach distance, The feature is that the finished pile diameter is controlled by reliably crossing the jets ejected from these nozzles.
[0008]
[Problems to be solved by the invention]
The above proposal itself is effective, but it is necessary to adjust the nozzle injection angle with high accuracy in order to cause the jet jets to collide with each other with certainty. Such high-precision adjustment or fine adjustment is a very complicated operation, which leads to an increase in work labor. On the other hand, when the precision of fine adjustment is low and jets do not collide, the finished pile diameter of the underground consolidated pile to be created is adversely affected.
[0009]
In addition, when the fluid ejected from the nozzle passes through the flow path inside the injection device, cavitation and vortex flow occur in the tapered taper tube and the bent vent tube, and the portion is damaged. The problem, or the problem of causing disturbance in the jet itself, has been found.
[0010]
The present invention has been proposed in view of the problems of the prior art as described above, and an object thereof is to provide an injection apparatus capable of finely adjusting the injection angle of the nozzle.
[0011]
[Means for Solving the Problems]
Here, in order to ensure that the jets jetted from the nozzles collide with each other so that the energy of the jets beyond the collision point is zero, precise control of the drilling diameter by the jet jet is possible. In addition, it is necessary that the jet jets are sufficiently converged and the jet jets jetted from the upper and lower nozzles are similar to each other. For example, even if one jet is sharp and sufficiently converged, if the other is not sufficiently converged, it cannot be said that the jets intersect, and the energy of the jet is far from the collision point. But it will exist. That is, precise control of the excavation diameter becomes impossible.
[0012]
And in order to satisfy the above-mentioned two conditions, a taper pipe, a vent pipe, and a nozzle are required. Further, the finishing of the flow path through which the fluid ejected as a jet flows is made into a precision finish, so that it is possible to configure so that vortex is not generated and cavitation hardly occurs.
[0013]
The injection device of the present invention is made on the basis of such knowledge, and when the consolidated pile is formed in the ground by the combined use of the high-pressure jet jet and the mechanical stirring, the longitudinal direction of the pipe inserted into the ground is At least two nozzle devices that are provided on the stirring blades that are attached at intervals and that eject a high-pressure jet of a hardening material or water and an air jet covering the periphery of the high-pressure jet are used, and these nozzle devices are adjustable in injection angle. Yes, the finished pile diameter is controlled by adjusting the jetting angle of the nozzle device according to the finished pile diameter of the consolidated pile to be formed, and reliably crossing the jets jetted from the two nozzle devices. In the injection device, the nozzle device includes a substantially horizontal main body tube portion and a nozzle portion, and the nozzle portion is configured by connecting a tapered tube, a vent tube, and a nozzle in this order, and the nozzle portion includes a rotary joint member. Through It mounted freely and fixable pivot relative to said body Te, the tapered tube and the vent tube are formed of a material having a cavitation resistance.
[0014]
According to the injection device of the present invention configured as described above, before the injection device is inserted into the ground, the high-pressure jet is ejected (on the ground) so that the high-pressure jet (cross jet) is reliably The two joints are rotated and finely adjusted by the rotary joint member so that they collide and the crossing angle becomes a predetermined angle in a range of 30 ° to 90 °, for example. When the fine adjustment is completed, the rotary joint member is operated to fix the nozzle part to the main body pipe part.
[0015]
Further, according to the present invention, since the tapered tube and the vent tube are made of a material having anti-cavitation properties, cavitation is generated in the tapered portion and the vent portion of the flow path in the injection device by the fluid ejected as a jet jet from the nozzle. Even if it occurs, the flow path has durability and problems such as breakage are prevented.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0017]
1 and 2 show an injection apparatus equipped with a nozzle device embodying the present invention. In these drawings, 1 is a generator, 2 is a high-pressure pump driven by the generator 1, 3 is piping, 4 is a swivel joint that connects a pipe inserted into the piping 3 into the ground, and 5 is a stirring process. Machine 6 is a pipe inserted into the ground, 7a, 7b and 7c are stirring blades 10a, 10b and 10c which are provided in the pipe 6 at several intervals in the longitudinal direction thereof, and stirring blades 7a, 7b and 7c As shown in FIG. 2, the nozzle devices 10a, 10b, and 10c are provided with a high-pressure multi-layer jet J comprising a high-pressure jet J1 of a hardening material or water and an air jet J2 covering the periphery of the high-pressure jet J7. The crossing angle α can be adjusted by spraying. The nozzle device 10a will be described as an example with reference to FIGS. The nozzle device 10 a is schematically configured from a main body pipe portion 11, a nozzle portion 20, and a cap nut 16 that connects both the portions 11 and 20.
[0018]
The main body tube portion 11 is configured as a double tube with an outer tube 12 having a flange portion 13 formed at one end and a screw portion 14 formed at the other end, and an inner tube 15.
[0019]
A nozzle portion outer tube 22 is coupled to the nozzle block 21 of the nozzle portion 10 a by a flange portion 23 and a bolt 24. The other end of the nozzle portion outer tube 22 is fastened and fixed to the main body tube portion 11 by a flange portion 25 and a cap nut 16 screwed into the screw portion 14. Therefore, the nozzle part 20 is attached to the main body pipe part 11 so as to be rotatable and fixed.
[0020]
In other words, a rotary joint is configured by the end portion on the main body tube portion 11 side of the nozzle portion 20, the end portion on the nozzle portion 20 side of the main body tube portion 11, and the cap nut 16. And the nozzle part 20 is attached to the main body pipe part 11 so as to be rotatable and fixed by this rotary joint.
[0021]
Inside the nozzle portion 20, a tapered tube 26, a vent tube 28 having a spray angle β of 22.5 °, for example, and a nozzle 29 are continuously provided from the main body tube portion 11 side. The vent pipe 28 is fixed to the taper pipe 26 by a fixing cap 27 screwed to the taper pipe 26, and the taper pipe 26 is fastened and fixed to the nozzle block 21 by a flange portion 23 and a bolt 24.
[0022]
The nozzle 29 is screwed into an inner hole of the nozzle block 21, and an air cap 30 that covers the nozzle 29 with a gap is screwed to the nozzle block 21. The inner pipe 15, the tapered pipe 26, the vent pipe 28, and the inner holes of the nozzle 30 form a high-pressure jet stream J <b> 1. On the other hand, a pipe line a between the outer pipe 12 and the inner pipe 15, a pipe line b between the nozzle part outer pipe 22 and the taper pipe 26, a pipe between the nozzle block 21, the fixed cap 27 and the vent pipe 28. A passage for the air jet J2 is formed by the passage c, the plurality of through holes d formed in the nozzle block 21, and the passage e between the air cap 30 and the nozzle 29.
[0023]
The pipe-side portions 26a and 28a indicated by the hatched portions of the taper pipe 26 and the vent pipe 28 are formed of a hardened alloy material such as tungsten carbide, which is a material having cavitation resistance. Reference numerals 31, 32, 33 and 34 in the figure are O-rings.
[0024]
Next, the operation will be described.
[0025]
Water or a hardener is sprayed from the high pressure pump 2 through the swivel joint 4 and from the nozzle devices 10a, 10c provided on the stirring blades 7a, 7c. Here, it is assumed that a curing material is sprayed, and examples of the curing material include cement milk, mortar, and medicine. The nozzle devices 10a and 10c are adjustable in angle, and the injection angles of the respective nozzle devices 10a and 10c are set so that the intersecting jet S is established (so as to meet). The injection angle is set by loosening both the nozzle devices 10a and 10c and the cap nut 16, and finely adjusting the nozzle portion 20 by rotating it in one direction. It fixes to the part 11. The intersection angle α is set to an angle determined in advance according to the reach distance.
[0026]
The jetting timing of the jet is determined depending on the construction status at that time, and it may be either jetted when the pipe 6 is penetrated or jetted when the pipe 6 is pulled out.
[0027]
The mechanical stirring by the stirring blades 7a and 7c is performed, for example, by discharging the hardened material M at a low pressure from the vicinity of the tip of the tube 6 to form the stirring pile B-1. At the same time, when the pipe 6 is rotated while jetting the high-pressure multi-layer jet J from the nozzles 10a and 10c and the position of the processing machine 5 moves in either the upper or lower direction, the point T where the cross jet S meets as shown in the figure. The column-shaped pile B-2 having the outermost edge R as the outermost edge R is integrally finished in the ground A.
[0028]
Further, the crossing angle α is preferably 30 ° to 90 °. If the angle is 90 ° or more, the jet reaching distance is too short, and if it is 30 ° or less, it is not preferable because the collision mode of the jet needs to be controlled with extremely high accuracy. Accordingly, in the illustrated example, the vent angle β of the vent pipe 28 is set to 22.5 °, for example, and the crossing angle α is set to 45 °.
[0029]
Further, cavitation occurs in the hardened material flowing through the taper pipe 26 and the vent pipe 28 due to shrinkage and bending of the pipe line, but the pipe side parts 26a and 28a are formed of a material having anti-cavitation, so Increases the durability and durability.
[0030]
【The invention's effect】
Since the present invention is configured as described above, it is possible to finely adjust the injection angle of the nozzles so that the jets collide with each other reliably and to obtain an accurate finished pile diameter. Further, the cavitation resistance of the tapered pipe and the vent pipe can be increased and the durability can be improved.
[Brief description of the drawings]
FIG. 1 is a side view showing an injection apparatus equipped with a nozzle device embodying the present invention.
FIG. 2 is an enlarged view showing a main part of FIG.
FIG. 3 is a side sectional view showing an embodiment of the present invention.
4 is a view taken in the direction of arrow X in FIG. 3;
[Explanation of symbols]
A ... Ground B1 ... Agitation pile B2 ... Building pile J ... High-pressure cross jet J1 ... Hardening material or water jet J2 ... Air jet M ... Hardening material S ... Intersection Jet α ... Crossing angle β ... Vent angle 1 ... Generator 2 ... High-pressure pump 3 ... Pipe 4 ... Swivel joint 5 ... Stir processing machine 6 ... Pipe 7a ~ 7c ... stirring blades 10a to 10c ... nozzle device 11 ... main body pipe part 12 ... outer pipe 13 ... flange part 14 ... screw part 15 ... inner pipe 16 ... bag Nut 20 ... Nozzle part 21 ... Nozzle block 22 ... Nozzle part outer cylinder 23, 25 ... Flange part 24 ... Bolt 26 ... Tapered tube 26a, 28a ... Passage side portion 27・ ・ ・ Fixed cap 28 ・ ・ ・ Vent pipe 29 ・ ・ ・ Nozzle 30 ・ ・ ・ Air cap 31 ~ 34 ... O-ring

Claims (1)

When constructing consolidated piles in the ground by using a combination of high-pressure jet jet and mechanical stirring, a high-pressure jet of hardener or water is provided on the stirrer blades installed at intervals in the longitudinal direction of the pipe inserted into the ground. And at least two nozzle devices for jetting an air jet covering the high-pressure jet, and these nozzle devices are adjustable in jetting angle, and the nozzle device jets according to the finished pile diameter of the consolidated pile to be formed. In the injection apparatus for controlling the finished pile diameter by adjusting and intersecting the angle, the nozzle apparatus includes a substantially horizontal main body pipe section and a nozzle section, and the nozzle section includes a taper pipe, a vent pipe, and a nozzle. The nozzle portion is rotatably and fixedly attached to the main body via a rotary joint member, and the tapered tube and the vent tube are cavitation resistant. Injection apparatus characterized by being formed of a material having a.

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