JP3876114B2 - Ground improvement rod structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The disclosed technology belongs to the technical field of a nozzle structure for promoting mud discharge of a rod for ground cutting used for ground improvement work.
[0002]
[Prior art]
As is well known, in Japan, where the land is narrow and many terrain conditions are close to the long coastline where many mountainous forests are intricately complicated, not only for agricultural and livestock, but also for residential housing and various industrial facilities Therefore, the effective use of the national land has been an important issue for a long time, and therefore ground improvement work has been researched and developed in various ways, and the fruits are effectively used practically. Have been shared.
[0003]
Thus, in the ground improvement work, as shown in FIG. 5, like the jet grout, the ground 1 is preliminarily drilled with the guide casing 8 and the hole 6 is inserted into the drilling hole 6 via the guide casing 8. A double-pipe or triple-pipe rod 2 (a double-pipe rod or a triple-pipe rod) is inserted, the guide casing 8 is slightly pulled out, and the guide casing 8 is pulled out. And the rod 2 are ejected while being pulled out together (the guide casing 8 may be entirely ejected and ejected).
[0004]
Then, cutting water 5 (further, there is an aspect such as surrounding compressed air) is sprayed from the nozzle 4 of the tip monitor 3 of the rod 2 to cut the ground 1, and the hardening material 5 ′ is discharged from the nozzle 4 ′ on the opposite side. Construction methods such as jet grouting method for jetting and filling are widely used.
[0005]
Thus, in the above-described jet grout method or the like, the soil cut by the cutting water 4 ejected from the tip monitor 3 becomes the slime 7 and is lifted from the bore 6 and discharged into a pit (not shown) provided on the ground. Then, it is transported to a predetermined disposal facility by a dump truck or the like and disposed of in a predetermined manner.
[0006]
However, the lifted slime 7 has a disadvantage that it cannot be discharged smoothly when its viscosity is high, etc., and there is also a disadvantage that the improved diameter becomes smaller or the improved quality is lowered.
[0007]
Even when the drilling hole 6 is vertical, if the slime 7 has a high viscosity, stickiness or the like is generated and smooth drainage is difficult to be performed. However, depending on the construction mode, the drilling hole 6 may have a large inclination angle. In these cases, the air lift effect does not work, and it has been pointed out that the slime 7 is not easily drained more smoothly. In addition, the air lift effect may not be fully expected.
[0008]
[Problems to be solved by the invention]
The purpose of the invention of this application is a technical problem that is necessary for ground improvement such as jet grout construction based on the above-mentioned prior art, and that the problem of unsmooth waste mud treatment should be solved,
The purpose is to more smoothly drain the slime generated by the jet grout method, etc. , and to improve the ground as designed .
[0009]
[Means for Solving the Problems]
Such an object is achieved by the ground improvement rod structure described in the following (1) to (3).
[0010]
(1) In the ground improvement rod structure which has the nozzle for ground cutting in the tip monitor,
A ground cutting nozzle for injecting cutting water for ground cutting;
A water supply path for supplying cutting water to the ground cutting nozzle;
Provided to communicate with the water supply passage, and has a nozzle for assisting mud discharge for injecting a part of cutting water passing through the water supply passage in the slime discharge direction,
The ground improvement is characterized in that the water sprayed by the drainage assist nozzle imparts fluidity in the drainage direction to the slime generated by the cutting by the ground cutting nozzle. Rod structure.
[0011]
(2) In a ground improvement rod structure having a ground cutting nozzle on the tip monitor,
A ground cutting nozzle for injecting cutting water for ground cutting;
A water supply path for supplying cutting water to the ground cutting nozzle;
A branching from the water channel, and a nozzle for assisting mud discharge for injecting a part of the cutting water passing through the water channel in the direction of slime mud,
The waste sludge assist for water injected by the nozzle, Ground against slime occurring I accompanied the cutting with the nozzle for ground cutting, characterized in that is adapted to impart a waste sludge direction liquidity Improved rod structure.
[0012]
(3) In the ground improvement rod structure which has the nozzle for ground cutting in the tip monitor,
It is configured by connecting a tip monitor, one or more unit rods, and at least one backflush monitor,
The tip monitor has a ground cutting nozzle for injecting cutting water for ground cutting,
The unit rod has a water supply path for supplying cutting water to the ground cutting nozzle,
The backflush monitor has a water supply passage communicating with the water supply passage of the unit rod, and a nozzle for assisting mud discharge for injecting water toward the slime mud discharge direction,
A nozzle for assisting sludge discharge in the backflush monitor is provided so as to communicate with the water supply passage, and a part of the cutting water passing through the water supply passage is jetted in the slime discharge direction to discharge the slime. A soil-improving rod structure characterized by imparting fluidity in the mud direction.
[0013]
That is, in order to solve the above-mentioned problems, the structure of the invention of the present application, which is summarized in the scope of the above-mentioned claims along with the above-mentioned object, is a ground improvement rod having a cutting nozzle at a tip monitor, Based on the fact that a backflush monitor provided with a nozzle for draining mud is provided in the water supply passage for the nozzle for the nozzle, therefore, the required number of backflush monitors are provided in the rod joint part, The assisting back flash monitor is provided behind the rod and inclined with respect to the circumferential direction, and further, the assisting nozzle is provided within the outer peripheral surface of the rod. It has taken technical measures.
[0014]
[Action]
At a predetermined depth in the drilled hole, the soil is cut with cutting water from a ground cutting nozzle provided in the tip monitor, and slime generated in the hole is discharged. At that time, cutting water is ejected from the nozzle of the tip monitor, and assisting water ejected from the exhaust mud assist nozzle (back nozzle) of the back flash monitor is used to assist the exhaust mud . Therefore, regardless of the depth and inclination (which may be horizontal) of the drilling hole, the slime is smoothly drained regardless of its viscosity, and the ground improvement as designed is performed.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an example of an embodiment of the invention of this application will be described with reference to FIGS.
In addition, the same aspect part as FIG. 5 shall be demonstrated using the same code | symbol.
[0016]
Aspect of the illustrated embodiment Ru der intended application of jet grouting.
To ground 1, in forming a drilling 6 through the guide casing 8, to insert the rod 2 into該削hole 6, it fills the cured material 5'.
[0017]
The rod 2 of the present invention has an inner tube 11 for pumping the hardened material 5 '. A sheath-like outer tube 12 is externally provided on the outer side of the inner tube 11 via a predetermined gap. A water supply path 15 is formed between the inner pipe 11 and the outer pipe 12. The cutting water pumped at a predetermined pressure passes through the water supply passage 15 and is sent to the tip monitor 3 provided on the tip side of the rod 2.
[0018]
Further, the required number of back flash monitors (auxiliary monitors) 9 as shown in FIGS. 2 and 3 are connected to the rod 2 of the present invention at the necessary locations as shown in FIG. This back flushing monitor 9 have a unit joint 13 screw 14 for coupling is formed. In addition, a water supply path 15 is formed between the inner tube 11 and the outer tube 12 of the back flash monitor 9 so that cutting water having a predetermined pressure is sent to the tip monitor 3.
[0019]
In addition, although the aspect of the rod to show in figure is a thing of a double pipe, the triple pipe of air supply may be sufficient.
[0020]
A back nozzle (a mud assisting nozzle) 16 constituting a discharge nozzle for assisting mud discharge is connected to each unit joint 13 of each back flash monitor 9, and the back nozzle 16 communicates with the water supply path 15. Is provided. As shown in FIGS. 2 and 3, the back nozzle 16 is provided in a state of being inclined rearward so that the front end is in the outer peripheral surface of the outer tube 12 . An inclined surface 17 is formed on the outer tube 12 of the backflash monitor 9 so as to avoid being worn with time by a back jet for assisting from the back nozzle 16 .
[0021]
Of course, the swivel joint of the implementation content provided in the main part of the rod 2 is pumped by a pumping amount corresponding to the amount of water sprayed from the back nozzle 16 for assisting the drainage of each unit rod. The amount of water jetted from the back nozzle 16 provided on the flash monitor 9 and the amount of water jetted from the cutting nozzle 4 provided on the tip 3 for cutting the ground are designed so that their nozzle diameters correspond to the required jet amount. And fed by pressure.
[0022]
Depending on the design, it may be inclined to a direction out spouting the back nozzle 16 for assisting in the circumferential direction of the outer tube 12. Thereby , the jet for assistance to eject gives spiral-like fluidity to the slime in the drilling hole 6 so that the mud can be discharged more smoothly .
[0023]
In addition, the water channel is not limited to one single water channel 15 as shown in FIG. 2, but can be designed to be pipe-shaped mutually independent water channels 15 ′ as shown in FIG. It is.
[0024]
When carrying out the jet grout construction, each unit rod of the rod 2 is connected to a length of a predetermined depth, and the cutting water 5 is pumped into the water supply path 15 from the swivel joint at the base end. Cutting water 5 having reached the front end monitor 3 via the water channel 15 feed is ejected from the cutting nozzles 4 provided at the tip monitor 3 into the soil, cutting the ground 1 by its ejection energy to form a drilling 6 its slime 7 was waste sludge, discharged into the pit (not shown) formed on the surface of the ground 1 or the like with. However, when the viscosity of the soil 1 is high, a so-called sticky state or the like may occur and smooth drainage may not be performed (conventional case).
[0025]
Therefore, in the present invention, the joint of the rod 2 having a predetermined length reaching a predetermined depth (not necessarily each joint, for example, one or any number of points, and every rod 2 or every other number) boosting water for waste sludge assistance from the back nozzle 16 for assisting provided also be) at the point is back ejected, so as to assist the waste sludge slime 7 in drilling 6.
In addition, since the back nozzle 16 of the back flash monitor 9 having a predetermined number of stages is assisted, the generated slime is smoothly drained as designed even if it is highly viscous, and is discharged into the pits on the ground 1. The
Further, as described above, when the back nozzle 16 is provided so as to be inclined in the rearward direction of the outer tube 12, the assisting jet water sprayed from the back nozzle 16 of the backflash monitor 9 is spiral with respect to the slime 7. The fluidity is added to assist the rise of the mud and the mud is discharged more smoothly.
[0026]
Incidentally, a rod structure according to the present invention may be a double tube type as described above, have good even triple tube type air feed combination. Further, in the double tube type illustrated in FIG. 2, the curing material 5'the inner tube 11, but so as to pump the cutting water 5 to the outer tube 12, the inner pipe 11 on the contrary The aspect which pumps the hardening material in the outer tube | pipe 12 with the cutting water 5 may be sufficient.
[0027]
Further, embodiments of the invention of this application is not limited to the above examples of course, for example, backflushing monitor 9 is not limited to one, by interposing the joint each such rod 2, a plurality of stages Ru can be provided back nozzle 16 for assisting the. Further, various modes such as providing two or more back flash monitors 9 for assisting and arranging a plurality of units, or providing a single base for each rod 2 can be adopted.
[0028]
Further, the target drilling hole 6 is not limited to the “perpendicular” one with respect to the base, but can also perform “inclined” or “horizontal” drilling.
[0029]
Further, the water supply path 15 outside the inner pipe 11 is not limited to a single one as shown in FIG. 2, but is mutually independent for each water supply path 15 ′ as shown in FIG. Various modes such as a shape may be adopted.
[0030]
In the above configuration, when jet grout construction is performed in which the drilling hole 6 is formed in the ground 1 and the hardened material is filled, the pressure is accumulated in the water supply path 15 from the one-side cutting nozzle 4 provided in the tip monitor 3. The drilled water is ejected into the ground 1 and cut, and at that time, the back nozzle 16 is ejected backward to assist the mud discharge of the slime 7. In addition, a predetermined hardening material 5 ′ is fed into the inner tube 11, and is fed from the nozzle 4 ′ on the opposite side of the cutting water nozzle 4 of the tip monitor 3 to be filled .
[0031]
In this case, even when the viscosity of the slime 7 is high, even drilling 6 how the depth is deep is assisted hydro smoothly can be waste sludge, without hindrance to the waste sludge, Moreover, the viscosity of the slime 7 to be discharged is lowered to provide fluidity, and the discharged mud is performed more smoothly.
[0032]
Meanwhile, cured material 5'is pumped through the inner tube 11, is filled with ground in from the opposite side of the nozzle 4 'of the monitor 3, it is possible to achieve the intended purpose.
[0033]
In this way, the backflush monitor 9 is inserted in the rod joint in a desired number of steps, so that even if the slime generated along the cutting hole is highly viscous regardless of the depth, Since mud action is assisted in multiple stages, slime drainage is performed smoothly as designed.
[0034]
Further, the cutting water nozzle 4 of the tip monitor 3 can be used not only for the cutting water 5 but also for the type of construction in which air or the like is wrapped and ejected.
[0035]
In addition to the double pipe type outer pipe 12, a mode of using a plurality of outer pipes equal to or more than a triple pipe can be adopted as the water supply channel.
[0036]
Further, depending on the design, it is possible to replace the back nozzle 16 for assisting, and it is also possible to change the diameter of the back nozzle 16 according to the amount of drilling water to be supplied according to the construction mode.
[0037]
Further, the water for assisting the back nozzle 16 not only causes the water pressure fed to the water supply passage 15 to be ejected in a kind of reverse flow, but also provides a water supply passage provided independently of the cutting nozzle 4 of the tip monitor. It is also possible.
[0038]
【The invention's effect】
As described above, according to the invention of this application, a high-viscosity slime generated during ground cutting can be smoothed by providing a back flush monitor having a back nozzle for drainage assistance at a joint to a rod used for jet grout construction or the like. The excellent effect of being able to drain mud is achieved .
[0039]
Further, since the back flash monitor need only be interposed at the joint portion of the rod joint or the like, the assembling work is completed only by interposing the back flash monitor prepared in advance at the factory . Therefore, assembly, maintenance, inspection , and the like are simple, and as a result, an effect that leads to cost reduction is achieved .
[0040]
Above all, the efficiency in improving the ground is good because the construction can be performed as designed, and an excellent effect is achieved that the ground improvement with high reliability is performed.
[Brief description of the drawings]
FIG. 1 is an overall schematic side sectional view of an embodiment of the invention of this application.
FIG. 2 is a partially enlarged cross-sectional view of a backflash monitor.
FIG. 3 is a schematic front view of a backflash monitor.
4 is a sectional view taken along the line IV-IV in FIG.
FIG. 5 is a cross-sectional view of a general embodiment of jet grouting.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Ground 2 Rod 3 Tip monitor 4 Nozzle 4 'Nozzle 5 Cutting water 5' Hardened material 6 Drilling hole 7 Slime 8 Guide casing 9 Back flash monitor 10 Inner tube screw 11 Rod inner tube 12 Rod outer tube 13 Unit joint 14 Outer tube screw 15 Water supply path 16 Back nozzle (nozzle for assisting mud discharge)
17 Inclined surface

Claims (3)

A ground improvement rod structure having a ground cutting nozzle on the tip monitor , wherein the slime generated by cutting by the ground cutting nozzle is discharged through a gap existing outside the rod. In the rod structure ,
A ground cutting nozzle for injecting cutting water for ground cutting;
A water supply path for supplying cutting water to the ground cutting nozzle;
The nozzle is provided so as to communicate with the water supply passage , and the nozzle tip is provided so as to face the gap outside the rod, and a part of the cutting water passing through the water supply passage is sprayed in the slime sludge direction outside the rod. And a nozzle for assisting mud discharge for facilitating drainage ,
The water sprayed by the drainage assist nozzle reduces the viscosity of the slime generated along with the cutting by the ground cutting nozzle , and imparts fluidity in the drainage direction to the slime . A ground improved rod structure characterized in that the slime is drained through a gap outside the rod. A ground improvement rod structure having a ground cutting nozzle on the tip monitor , wherein the slime generated by cutting by the ground cutting nozzle is discharged through a gap existing outside the rod. In the rod structure ,
A ground cutting nozzle for injecting cutting water for ground cutting;
A water supply path for supplying cutting water to the ground cutting nozzle;
The provided branched from the water supply passage, and has the nozzle tip is provided so as to face the gap of the rod outer injects a part of the cutting water through the feed water channel in the slime waste sludge direction of the rod outer A drainage assist nozzle for facilitating drainage, and
The water sprayed by the drainage assist nozzle reduces the viscosity of the slime generated along with the cutting by the ground cutting nozzle , and imparts fluidity in the drainage direction to the slime . A ground improved rod structure characterized in that the slime is drained through a gap outside the rod. A ground improvement rod structure having a ground cutting nozzle on the tip monitor , wherein the slime generated by cutting by the ground cutting nozzle is discharged through a gap existing outside the rod. In the rod structure ,
It is configured by connecting a tip monitor, one or more unit rods, and at least one backflush monitor,
The tip monitor has a ground cutting nozzle for injecting cutting water for ground cutting,
The unit rod has a water supply path for supplying cutting water to the ground cutting nozzle,
The backflush monitor has a water supply channel communicating with the water supply channel of the unit rod and a nozzle for assisting mud discharge for facilitating mud discharge by injecting water toward the slime mud discharge direction outside the rod. And
The nozzle for assisting mud discharge of the backflush monitor is provided so as to communicate with the water supply passage , and the tip of the nozzle is provided so as to face the gap outside the rod,
The nozzle for assisting mud discharge injects a part of the cutting water passing through the water supply passage of the backflush monitor in the slime mud discharge direction outside the rod to reduce the viscosity of the slime, and in the mud discharge direction with respect to the slime. The ground improvement rod structure characterized by giving the fluidity of, and as a result, the slime is drained through the gap outside the rod.

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