JP5953040B2 - High-pressure jet stirring method - Google Patents

Description

  The present invention relates to a high-pressure swivel and a high-pressure jet agitation method (so-called jet grout method) using the high-pressure swivel. Specifically, the injection rod is inserted to the target depth of the ground to be improved and connected to the tip of the rod. The invention relates to a ground improvement method in which a columnar improvement body is formed in the ground by laterally injecting an ultra-high pressure hardened material from an injection nozzle of a monitor and pulling up the rod while rotating, and a high-pressure swivel used for this.

  For example, as shown in Figs. 4 (A) to 4 (D), the ground is improved by discharging the drilling water from the monitor at the tip of the injection rod and drilling to the target depth. And a method of injecting an ultra-high pressure hardened material from the monitor and gradually raising the injection rod while rotating the injection rod around its axis to form a columnar improvement body made of cutting soil and liquid hardened material around the rod. Are known.

  In this type of ground improvement work, a swivel 8 is connected to the head of the injection rod 6 as shown in FIG. A high-pressure hose and an air hose (not shown) are connected to the intake ports 81 and 82 of the swivel 8, respectively. On the other hand, a self-drilling hole monitor 9 for discharging the drilling water at the time of drilling and drilling the ground at the tip side of the injection rod 6 and for injecting a hardened material into the ground at high pressure at the time of construction is provided. It is connected.

  The swivel 8 is connected to the head of the injection rod 6 and has a liquid channel 83 for pumping the drilling water and the hardening material and an air channel 84 for pumping the compressed air. The liquid flow path 83 and the air flow path 84 communicate with the flow paths 95 and 96 of the self-cutting hole monitor 9 through the injection rod 6, respectively.

  The self-cutting hole monitor 9 has a drilling bit 91 and a drilling water discharge port 92 at the lower end, and has a hardening material nozzle 93 and an air nozzle 94 at the side. Further, the monitor 9 has a liquid channel 95 for pumping the hole water and the hardener, and an air channel 96 for pumping the compressed air. The liquid channel 95 serves as both a drilled water channel and a hardener channel.

  In the case of drilling, as shown in FIG. 5A, the drilling water is pumped through the liquid flow paths 83 and 95, and the ground below the monitor is discharged while discharging the drilling water from the drilling water discharge port 92. The injection rod 6 is inserted to the target depth by cutting.

  When the drilling to the target depth is completed, the swivel 8 is cut off from the injection rod 6 as shown in FIG. 5 (B), and the steel ball 2 is introduced into the inner tube from the top of the injection rod. As a result, the drilling water path 97 in the monitor leading to the drilling water discharge port 92 is closed by the steel ball 2, and the spray path of the monitor is switched to the curing material spray path.

  When the introduction of the steel ball 2 is completed, the swivel 8 is connected again as shown in FIG. 5 (C), the hardening material is pumped into the liquid flow paths 83 and 95, and the hardening material is introduced into the ground from the hardening material nozzle 93. High pressure injection. At the same time, the self-cutting hole monitor 9 is gradually lifted while rotating around its axis together with the injection rod 6, whereby a columnar improvement body made of a hardening material and cutting soil is formed around the injection rod.

Japanese Utility Model Publication No. 48-63512 JP 2000-303445 A JP 2008-095442 A

  As shown in Fig. 5 (B), switching the injection path of the monitor by inserting the steel ball required disconnecting and connecting the swivel, but the conventional self-drilling method is a small diameter such as CCP method, JSG method, etc. Because it was limited to jets, it did not require much effort to disconnect and connect the swivel to insert the steel ball. However, when the swivel becomes large and heavy in order to cope with the increased diameter, it takes a lot of labor to disconnect and connect the swivel, but no effective countermeasure has been conceived so far. . In addition, since such a swivel disconnection / connection operation is performed with the hard high-pressure hose and air hose connected, the handling is extremely bad, and improvement in workability has been strongly desired.

  In the jet grout method, except for the CCP method, the swivel and rod are disconnected and connected using a crane or the like as shown in FIG. In the case of the JSG method, the weight of the swivel and hose that are routed when the swivel is disconnected and connected is about 30 kg, and no great effort is required. However, the swivel and hose, which became large and heavy in response to the increased diameter, exceeded 100 kg, and the swiveling and connecting work when the steel ball was inserted was a cumbersome and difficult task. In other words, when handling large and heavy swivels, the weight and resistance (hardness) of high-pressure hoses and air hoses that are still connected increase, and the rotational resistance increases due to the increased size of packings. Workability has been significantly reduced due to an increase in the weight of a tool such as a pipe wrench. Under such conditions, handling is bad and dangerous, so ensuring safety when throwing steel balls has been an issue.

  In order to cope with the problem of disconnection and connection of the swivel when the steel ball is inserted, a method of temporarily disconnecting the high-pressure hose connected to the swivel and inserting the steel ball and pushing it away with a hardener was also examined. However, this method has a problem in that the steel ball is caught in the middle and cannot be swept away, so that certainty is lacking. Further, as can be seen from FIG. 6, the connecting portion of the high-pressure hose is high and the scaffold is unstable, so that the disconnecting and connecting work is highly dangerous. Furthermore, when the swivel becomes larger as the improved diameter increases, the high-pressure hose connected to the swivel becomes heavier and harder, making it difficult and difficult to disconnect and connect the high-pressure hose.

As a method of switching the monitor from the drilling state to the injection state, in addition to the method of switching to the ultra-high pressure injection path by closing the drilling water path by inserting the steel ball described above into the monitor, a patent The method of switching the path by the pressure difference between the two liquids as in Reference 1 and the one that discharges water downward during drilling without switching the ultrahigh pressure injection path as in Patent Documents 2 and 3. Sometimes, a method of switching the path so as to inject air in a lateral direction has been proposed.
However, there is a problem with the durability of the mechanical working part and the stability of the operation in the jet grout monitor that passes the super high pressure hardener, and an effective route switching method that replaces the steel ball method has not yet been found. Is the reality.
Therefore, in spite of the wide use of the steel ball method, separation of large swivels and measures for connection still remain a major issue.

  Further, in the prior art, as shown in FIG. 5B, when the swivel is cut off, the flow path of the injection rod is released, and as a result, earth and sand flow back into the air nozzle of the monitor, causing clogging. It was. When such clogging occurs in the air nozzle, effective measures to prevent clogging of the air nozzle are still proposed, although the clogging of the nozzle cannot be removed unless the rod part is pulled up and the nozzle part is disassembled. Absent.

  In recent jet grouts, the formation diameter has been increased, and it is strongly desired to prevent clogging of the air nozzle. That is, it is necessary to increase the discharge amount of the hardened material in order to construct the formed diameter large and quickly, and at the same time, it is necessary to increase the amount of air in order to ensure a long cutting length of the jet. In order to increase the amount of air in this way, it is necessary to increase the diameter of the air nozzle. However, if the nozzle diameter increases, large soil particles (sand and gravel) can easily enter the air nozzle when the swivel is disconnected. Therefore, the nozzle is easily clogged. Therefore, an effective countermeasure that can prevent clogging of the air nozzle is also strongly desired in order to cope with an increase in the formed diameter.

  Therefore, in view of the above-mentioned problems of the prior art, the object of the present invention is to enable a steel ball to be introduced more easily and reliably in a high-pressure jet agitator using a self-cutting hole monitor, and to provide an air nozzle for the monitor. An object of the present invention is to provide a high-pressure swivel and a high-pressure jet stirring method that can prevent clogging.

The above purpose is
An air flow path for sending compressed air to the air nozzle of the self-drilling hole monitor, a liquid flow path for pressure-feeding one of the drilling water and hardened material to the self-drilling hole monitor, and an injection path for the self-drilling hole monitor A high-pressure jet agitation method using a swivel having an inlet for introducing a spherical valve body to be switched into the liquid channel, and a closing member for closing the inlet ,
Pumping the drilling water through a swivel connected to the head of the injection rod, drilling while discharging the drilling water from the drilling water discharge port of the self-drilling monitor connected to the tip of the rod,
When a post-drilling switching the injection path of the self-drilling monitor, while spraying the air from the air nozzle of the self drilling monitor, a spherical valve body by introducing self-cutting in the valve body from the swivel inlet blocking the drilling for water path holes monitor switches the injection path of the self-drilling monitor injection path curing material,
After the valve body is inserted, the inlet is closed, the curing material is pumped through the swivel, and the curing material is sprayed from the curing material nozzle of the self-cutting hole monitor.
This is achieved by a high-pressure jet stirring method characterized in that.

In the above high-pressure jet agitation method, a nozzle plug that can be pushed out to the hardened material nozzle of the self-cutting hole monitor is provided, and air is blown from the surrounding air nozzle paired with the hardened material nozzle, and a spherical valve is inserted from the swivel inlet. Put your body in.

According to the present invention, the inlet dedicated to the steel ball (spherical valve body) used for switching the injection path of the self-cutting hole monitor is formed in the swivel. Thereby, a steel ball can be thrown in without separating a swivel from an injection rod. That is, the injection path switching operation of the self-cutting hole monitor can proceed while the swivel is connected to the injection rod and the high pressure hose is connected to the swivel.
Therefore, since it is possible to omit the swivel disconnection / connection work that is conventionally required each time the injection path of the monitor is switched, the time and labor for that can be reduced. As a result, the injection route switching work of the self-cutting hole monitor can be completed easily and quickly, the construction time is shortened, and the construction efficiency is dramatically improved.
In addition, since the steel ball can be thrown in by simply opening the slot and throwing in the valve body, regardless of the size and weight of the swivel used, it is extremely easy to switch the injection path of the monitor.
Moreover, the risk of loosening of the swivel during construction can be avoided by reducing the number of times the swivel is connected and disconnected in the whole construction.
In addition, when a large swivel is handled by increasing the diameter of the improved body to be created, safety is improved by removing and connecting the large swivel when switching the injection path of the self-cutting hole monitor.
In addition, since the work is simplified and the safety is improved, the steel ball throwing method with high reliability can be used more easily as the injection path switching means of the monitor.
In addition, since the insertion port is designed to be closed with a closing member such as a screw-in type plug or an open / close valve except when a steel ball is introduced, it does not hinder the pumping of drilling water and ultra-high pressure hardened material. Absent.

Further, according to the present invention, it is not necessary to separate the swivel from the injection rod in the work for throwing in the steel ball, so that the work can be advanced without stopping the supply of compressed air through the swivel.
Therefore, a nozzle plug is provided in advance on the hardener nozzle of the monitor, and while the compressed air is jetted from the air nozzle around the hardener nozzle, the blocking member is removed (or opened) from the inlet of the swivel and the steel ball is removed. By inserting it, it is possible to prevent clogging of the air nozzle of the monitor. At this time, since the nozzle plug is provided in advance in the curing material nozzle surrounded by the air nozzle, no backflow occurs in the curing material nozzle even if air is continuously jetted.
Therefore, the clogging of the air nozzle can be prevented by two characteristics: (1) a characteristic in which a nozzle plug is provided on the curing material nozzle, and (2) a characteristic in which compressed air is injected from the air nozzle during the injection path switching operation.

  Moreover, since the clogging of the air nozzle can be prevented as described above, even if the air nozzle diameter is increased, the backflow of large soil particles or the like when the swivel is cut off can be prevented. Therefore, even in a large-diameter formation that requires a large-diameter air nozzle, a long cutting length of the jet can be secured, so that it is possible to reliably cope with an increase in the generation diameter.

It is sectional drawing which shows the high pressure swivel used for the high pressure injection stirring method of this invention, and a self-cutting hole monitor. It is sectional drawing which shows the function effect | action of the nozzle plug provided in the hardening material nozzle of a self-cutting hole monitor. It is a figure which shows the functional effect | action of the high pressure swivel and the self-cutting hole monitor in the high pressure jet stirring method of this invention. It is a figure which shows the outline | summary of the general high-pressure jet stirring method. It is a figure which shows the high pressure swivel used for the conventional high pressure injection stirring method, and a self-cutting hole monitor. It is a figure which shows a mode that the swivel is cut | disconnected for steel ball insertion.

The present invention relates to a high-pressure jet stirring method and a high-pressure swivel used in the method.
First, each configuration of the high-pressure swivel and the self-cutting hole monitor will be described with reference to FIG.

(High pressure swivel)
A swivel 1 shown in FIG. 1 is a high-pressure swivel used in a high-pressure jet stirring method using a self-cutting hole monitor.
The swivel 1 includes a suspension unit 11 that can be suspended by a crane or the like, a liquid channel 13 for pumping one of the drilling water and the ultra-high pressure hardened material, and an air flow for pumping compressed air. Connected in a screwed manner to the injection path 3, a loading port 3 for loading a steel ball 2 that forms a spherical valve body (water stopcock), a screwed plug 4 that is a closing member for closing the loading port, and an injection rod 6 And a connecting portion 17 to be connected.

  The air flow path 15 communicates with the air flow path 52 of the monitor 7 via the injection rod 6. The intake port 16 at the upstream start end of the air flow path 15 is connected to a compressed air supply device via an air hose (not shown).

  The liquid flow path 13 communicates with the liquid flow path 51 of the monitor 7 via the injection rod 6. The liquid channel 13 serves as a drilling water channel for pumping the drilling water to the drilling water discharge port 61 of the monitor and a curing material channel for pumping the curing material to the curing material nozzle 62 of the monitor. It is a shared passage. The intake port 14 at the upstream start end of the liquid flow path 13 is connected to a high-pressure hardener supply device and a high-pressure water supply device via a high-pressure-resistant high-pressure hose (not shown). The injection path of the monitor 7 is set to the drilling water path or the curing material injection path according to the progress of the construction, and the drilling water or the curing material is pumped through the liquid flow paths 13 and 51.

  The inlet 3 is a steel ball-only inlet formed in the top housing of the swivel 1 and communicates with the liquid flow path 13 through a guide hole at the back thereof. The insertion port 3 is closed with a removable plug 4 during construction except when the steel ball 2 is introduced. The plug 4 is attached to the input port 3 so that it does not come off even when it receives the drilling water passing through the liquid flow path 13 and the pressure of the hardened material. In the present embodiment, a screw-in type plug 4 in which an external screw is formed is employed as a closing member that closes the insertion port 3. When the steel ball 2 is inserted, the handle outside the plug is grasped and turned in the direction in which the screw is loosened, and the plug 4 is manually removed from the insertion port 3 as shown in FIG.

  When switching the injection path of the monitor 7 to be described later (switching from the drilling water path to the hardening material injection path), as shown in FIG. . The thrown steel ball 2 falls through the liquid flow path 13 in the swivel 1 and the flow path in the injection rod 6 that leads to it, and a ball valve seat 58 at the entrance of the drilled water path 57 in the monitor 7. Sit on. The seated steel ball 2 functions as a closing member that closes the drilling water path 57 of the monitor 7. When the steel ball 2 is seated on the ball valve seat 58, the injection path of the monitor 7 is switched from the drilling water path to the hardening material injection path.

(Self-cutting hole monitor)
The self-cut hole type ground improvement monitor 7 is an injection device that is used by being screwed to the tip of the injection rod 6.
The monitor 7 has a monitor main body 53 in which a liquid flow path 51 and an air flow path 52 are formed, and a drill bit 54 provided at the lower end of the monitor main body. Further, the monitor 7 includes a drilling water discharge port 61 at the lower end portion thereof, a curing material nozzle 62 at the side portion thereof, and an air nozzle 63 disposed around the curing material nozzle. Hole water is discharged downward from the hole water discharge port 61. From the curing material nozzle 62, an ultra-high pressure liquid curing material is sprayed in the rod radial direction, and from the air nozzle 63 that forms a pair with the curing material nozzle 62, compressed air accompanying the ultra-high pressure curing material is sprayed.

The air flow path 52 leads to an air nozzle 63 provided at the downstream end thereof.
The liquid flow channel 51 communicates with both the drilled water discharge port 61 and the hardener nozzle 62. The liquid channel 51 is a dual-purpose passage that also serves as a drilling water channel for pumping the drilling water to the drilling water discharge port 61 and a curing material channel for pumping the curing material to the curing material nozzle 62. is there. Depending on the progress of the construction, one of the drilling water and the hardener is pumped through the liquid channel 51.

  The hole water discharge port 61 communicates with the upstream side liquid channel 51 via a hole water channel 57. A check valve 56 is provided between the hole water discharge port 61 and the hole water channel 57 to prevent backflow of earth and sand. A ball valve seat 58 on which the dropped steel ball 2 can be seated is formed at the inlet of the drilling water passage 57. The steel ball 2 thrown in from the inlet 3 of the swivel 1 falls and passes through the injection rod 6 and is seated on the ball valve seat 58 of the monitor 7 so that the drilling water path 57 is closed. 7 injection path switches from the drilling water path to the curing material injection path. When it is set to the “drilling water path”, it can be discharged from the drilling water discharge port 61, and when it is set to the “curing material injection path”, it can be injected from the curing material nozzle 62.

  The air nozzle 63 is provided in the monitor main body 53 so as to surround the periphery of the curing material nozzle 62, and is arranged so that the air nozzle 63 and the curing material nozzle 62 are concentric in a front view. The super hard curing material nozzle 62 is configured to be detachable from the monitor main body 53, and is fixed to the monitor main body by screwing. An outer screw for screw connection is formed on the outer peripheral surface of the base end side of the hardening material nozzle 62.

  The hardening material nozzle 62 is provided with a nozzle plug 65 that closes the inside thereof. The nozzle plug 65 is formed of an elastic member such as rubber or plastic, and has a columnar portion and a conical portion. When attaching the curing material nozzle 62 to the monitor main body 53, as shown in FIG. 2A, a nozzle plug 65 is inserted in advance from the proximal end side of the curing material nozzle 62 and fitted into the nozzle. The curing material nozzle 62 is screwed into the monitor main body 53.

In the case of drilling, the nozzle plug 65 configured as described above receives a feed pressure (for example, about 2 MPa) of drilling water flowing through the liquid flow channel 51 as shown in FIG. Therefore, even if it receives the pressure, it is not pushed out of the curing material nozzle 62. Further, since the conical portion is brought into close contact with the inner wall of the surrounding nozzle by receiving the pressure of the drilling water, the drilling water does not leak from the hardening material nozzle 62 during drilling. Further, since the high pressure in the pushing direction always acts on the nozzle plug 65 during the pumping of the drilling water, it is not pushed into the monitor even if it receives a hydrostatic pressure from the outside of the nozzle.
On the other hand, when the drilling is completed and the pumping of the hardened material is started, the nozzle plug 65 receives an ultra-high pressure (for example, about 20 to 40 MPa) from the hardened material in the liquid flow channel 51, so that the conical portion is reduced in diameter. As a result of elastic deformation, the nozzle plug 65 is pushed out from the curing material nozzle 62 in the ejection direction as shown in FIG.
In this way, the nozzle plug 65 maintains the state in which the curing material nozzle 62 is closed even when receiving the pressure of the drilling water during drilling, and receives the pressure of the curing material after switching the spraying path of the monitor. It is pushed out from the nozzle 62.

  By providing such a nozzle plug 65 in the hardener nozzle 62, it is possible to prevent the drilling water from being discharged from the hardener nozzle 62 when drilling. In addition, since the nozzle plug 65 functions as a means for preventing clogging of the hardener nozzle 62, even if compressed air is continuously jetted to prevent clogging of the air nozzle 63, backflow of earth and sand to the hardener nozzle 62 is prevented. it can.

In the monitor 7 having the above-described configuration, the path through which the liquid (the drilled water or the hardened material) flowing through the liquid flow path 51 is discharged / injected is determined by the setting condition of the injection path in the monitor.
At the time of drilling, the injection path of the monitor 7 is set to “drilling water path”. In this set state, as described above, since the hardening material nozzle 62 is blocked by the nozzle plug 65, the drilling water passing through the liquid flow channel 51 passes from the drilling water discharge port 61 through the drilling water path 57. Discharged.
After the drilling is completed, the injection path of the monitor 7 is set to the “curing material injection path”. In this set state, since the steel ball 2 is seated on the ball valve seat 58 and closes the drilling water path 57, the ultra-high pressure hardened material passing through the liquid flow path 51 pushes out the nozzle plug 65 and is sprayed from the hardener nozzle 62. Is done.
Switching from the drilling water path to the hardening material injection path is performed by removing the plug 4 from the insertion port 3 of the swivel 1 and introducing the steel ball 2.

(High-pressure jet stirring method)
Next, a self-cutting hole type high-pressure jet stirring method (jet grout) using the high-pressure swivel 1 and the self-cutting hole monitor 7 will be described.

  First, as shown in FIG. 2A, the nozzle plug 65 is inserted into the curing material nozzle 62, and the proximal end side of the curing material nozzle is screwed and fixed to a predetermined position of the monitor main body 53.

  Next, as shown in FIG. 3A, a self-cutting hole monitor 7 is connected to the distal end side of the injection rod 6, and the swivel 1 is connected to the head of the rod. A high pressure water supply device and a high pressure hardener supply device are connected to the liquid flow path 13 of the swivel 1 via a high pressure hose, and a compressed air supply device is connected to the air flow path 15 via an air hose. The inlet 3 of the swivel 1 is closed with a plug 4.

  Subsequently, drilling is started using a boring machine, drilling is performed while adding the injection rod according to the drilling depth, and the injection rod 6 is inserted to the target depth. In this drilling step, the monitor 7 is pushed into the ground while rotating with the injection rod 6 to drill holes. At the same time, the drilling water is pumped through the swivel 1 and the injection rod 6, and the drilling water is discharged from the drilling water discharge port 61 at the lower end of the monitor.

  As shown in FIG. 3A, compressed air is supplied through the swivel 1 between the holes, and the compressed air is continuously ejected from the air nozzle 63 of the monitor 7. Thereby, clogging of the air nozzle 63 at the time of drilling can be prevented. Note that the hardener nozzle 62 surrounded by the air nozzle 63 is prevented from being clogged by a nozzle plug 65 provided in advance.

  When the drilling to the target depth is completed, as shown in FIG. 3 (B), the plug 4 is removed from the inlet 3 of the swivel while the swivel 1 is connected to the injection rod 6, and the steel ball 2 is inserted. . When removing the plug 4, it can be easily removed manually by holding the handle of the plug from the outside and continuing to turn the screw in the loosening direction. When the plug 4 is removed and the steel ball 2 is inserted, it is not necessary to disconnect the swivel 1 from the injection rod 6 and it is not necessary to disconnect the high-pressure hose connected to the swivel 1.

  During the loading operation of the steel ball 2, the compressed air is continuously sent through the swivel 1, and the plug 4 is removed and the steel ball 2 is loaded while jetting air from the air nozzle 63.

  The steel ball 2 introduced from the insertion port 3 enters the liquid flow path 13 of the swivel 1 and falls, passes through the liquid flow path in the injection rod 6 and the liquid flow path 51 of the monitor 7, and is substantially mortar of the ball valve seat 58. Sit on the seat.

  When the steel ball 2 is seated on the ball valve seat 58, the drilled water path 57 is blocked from the liquid flow path 51 thereabove. As a result, the injection path of the monitor 7 is switched from the drilling water path to the curing material injection path, and the cured material to be pumped subsequently can be ejected from the curing material nozzle 62.

  When the introduction of the steel ball 2 is completed, the insertion port 3 of the swivel 1 is closed again with the plug 4 as shown in FIG. 3C, and the feeding of the hardened material via the swivel is started. The hardened material pumped at a pressure far higher than the water supply pressure of the drilling water pushes out the nozzle plug 65 that closes the hardener nozzle 62 and opens the hardener nozzle. On the other hand, since the steel balls 2 are pressed against the ball valve seat 58 by the pressure of the hardened material, the injection path of the monitor 7 is maintained as the hardener injection path.

  Subsequently, the super high pressure curing material and the compressed air are continuously ejected from the curing material nozzles 62 and 83 of the monitor 7 and gradually lifted while rotating the monitor 7 together with the injection rod 6. In this process, the ground is cut over a predetermined region by the swirling jet of the super-high pressure hardened material and compressed air that are continuously jetted, and the cut earth and sand and the jetted hardened material are agitated. Thereby, the substantially cylindrical improvement body which consists of cutting soil and a liquid hardening | curing material around the injection | pouring rod is created in the ground.

  According to the above-described present invention, since the inlet 3 dedicated to the steel ball is formed in the swivel 1, the steel ball 2 can be inserted without separating the swivel 1 from the injection rod 6 when the injection path of the monitor 7 is switched. That is, the injection path switching work of the self-cutting hole monitor 7 can be advanced until the swivel 1 is connected to the injection rod 6 and the high pressure hose is connected to the swivel 1. Therefore, since the swivel disconnection / connection work that has been conventionally required every time the injection path of the monitor is switched can be omitted, the construction time is shortened and the construction efficiency is dramatically improved. Moreover, the risk of loosening of the swivel during construction can be avoided by reducing the number of times the swivel is connected and disconnected in the whole construction. Further, even when handling a large swivel, safety is improved by eliminating the work of disconnecting and connecting the large swivel when switching the injection path of the self-cutting hole monitor.

  In addition, since it is not necessary to separate the swivel 1 from the injection rod 6 in the work for throwing the steel ball, the work can be performed without stopping the supply of compressed air through the swivel as shown in FIG. Can proceed. Accordingly, a nozzle plug 65 is provided in advance on the hardener nozzle 62 of the monitor 7, and the plug 4 is removed from the inlet 3 of the swivel while jetting compressed air from the air nozzle 63 around the hardener nozzle, and the steel ball 2 Can prevent clogging of the air nozzle 63 of the monitor. At this time, since the nozzle plug 65 is provided in advance in the curing material nozzle 62 surrounded by the air nozzle 63, no backflow occurs in the curing material nozzle 62 even if air is continuously jetted.

  Furthermore, since the clogging of the air nozzle 62 can be prevented as described above, even if the air nozzle diameter is increased, backflow of large soil particles and the like when the swivel 1 is cut off can be prevented. Therefore, even in a large-diameter formation that requires a large-diameter air nozzle, a long cutting length of the jet can be secured, so that it is possible to reliably cope with an increase in the generation diameter.

(Modification)
The above-described embodiment is an example of an embodiment of the present invention, and various modifications are included in the technical scope of the present invention.

  For example, in the embodiment illustrated in FIG. 1, the positions of the inlet 3 and the plug 4 of the swivel 1 are illustrated on the opposite side of the high-pressure hose connection port in order to facilitate understanding, but this is not necessarily the optimum mode. . That is, the positions and angles of the insertion port 3 and the plug 4 are not limited to those shown in the figure, and may be provided at any position of the swivel as long as the function of the swivel can be maintained and the steel ball can be inserted.

  For example, in consideration of the structure or operability of the swivel, the insertion port and the plug may be provided at a position that is easy to use. Alternatively, the inlet and the plug may be provided at appropriate positions in consideration of the workability of the swivel and the manufacturing cost.

  In the above-described embodiment, the screw-in type plug 4 is used as a closing member that closes the insertion port 3, but the mode of the closing member is not limited to this, as long as the insertion port can be opened and closed from the outside of the swivel. Anything can be used. For example, in addition to the screw-type plug, a detachable or open / close lid, an open / close valve or the like may be employed as the closing member.

  Further, in the above-described embodiment, the double-tube type high-pressure jet agitator is given as a representative example, but the application range of the high-pressure swivel of the present invention is not limited to this, for example, a triple-tube type high-pressure jet agitator It is also possible to use it.

1 High-pressure swivel 2 Steel ball (spherical valve body)
3 Input port 4 Plug (blocking member)
6 Injection rod 7 Self-cutting hole monitor 8 Swivel 9 Self-cutting hole monitor 11 Hanging part 13 Liquid flow path 14 Intake port 15 Air flow path 16 Intake port 17 Connection part 51 Liquid flow path 52 Air flow path 53 Monitor body 54 Drilling bit 56 Check Valve 57 Drilling Water Path 58 Ball Valve Seat 61 Drilling Water Discharge Port 62 Curing Material Nozzle (Ultra High Pressure Curing Material Injection Nozzle)
63 Air nozzle (Compressed air injection nozzle)
65 Nozzle plug 81 Inlet port 82 Inlet port 83 Liquid channel 84 Air channel 91 Drilling bit 92 Drilling water discharge port 93 Hardener nozzle 94 Air nozzle 95 Liquid channel 96 Air channel 97 Channel for drilling water

Claims (2)

An air flow path for sending compressed air to the air nozzle of the self-drilling hole monitor, a liquid flow path for pressure-feeding one of the drilling water and hardened material to the self-drilling hole monitor, and an injection path for the self-drilling hole monitor A high-pressure jet agitation method using a swivel having an inlet for introducing a spherical valve body to be switched into the liquid channel, and a closing member for closing the inlet ,
Pumping the drilling water through a swivel connected to the head of the injection rod, drilling while discharging the drilling water from the drilling water discharge port of the self-drilling monitor connected to the tip of the rod,
When a post-drilling switching the injection path of the self-drilling monitor, while spraying the air from the air nozzle of the self drilling monitor, a spherical valve body by introducing self-cutting in the valve body from the swivel inlet blocking the drilling for water path holes monitor switches the injection path of the self-drilling monitor injection path curing material,
A high-pressure jet agitation method characterized in that after the valve body is inserted, the inlet is closed, the hardener is pumped through a swivel, and the hardener is sprayed from a hardener nozzle of a self-cutting hole monitor. A nozzle plug is provided on the curing material nozzle of the self-cutting hole monitor.
2. The high-pressure jet agitation method according to claim 1 , wherein a spherical valve body is introduced from an inlet of a swivel while injecting air from an air nozzle paired with the hardener nozzle.