JP6820098B2 - High-pressure injection nozzle device and ground improvement device equipped with it - Google Patents

Description

The present invention is a high-pressure injection nozzle device provided on the side surface of a monitor which communicates with the inside of a curing material liquid supply pipe in the injection rod and is connected to the tip of the injection rod, and a ground improvement device to which the high-pressure injection nozzle device is mounted.

Conventionally, a ground improvement device that inserts an injection rod into a drilled hole in the ground and injects a hardening material liquid in a direction perpendicular to the axial direction of the injection rod from a nozzle attached to the tip side surface of the injection rod has been known. Has been done.

As shown in FIG. 32, this ground improvement device is provided with an injection port 107 on the lower end side wall 101a of an injection rod 101 having a double pipe structure including a hardening material supply pipe 108 and a compressed air supply pipe 109. The injection port 107 surrounds the discharge port of the curing material liquid injection nozzle 110 communicating with the curing material liquid supply pipe 108 of the injection rod 101 and the curing material liquid injection nozzle 110, and communicates with the compressed air pressure feeding pipe 109. It is composed of a compressed air injection nozzle 111. Then, the curing material liquid is supplied from the upper part of the injection rod 101 via the curing material liquid supply pipe 108, and the cured material liquid is injected from the curing material liquid injection nozzle 110 (for example, Patent Document 1). ). Here, FIG. 32 is a front sectional view of a conventional injection rod.

Japanese Unexamined Patent Publication No. 10-331151

However, in the conventional ground improvement device, the curing material liquid is sent from the curing material liquid supply pipe 108 in the axial direction of the injection rod 101 to the curing material liquid injection nozzle 110 substantially orthogonal to the axis of the injection rod 101, so that the curing material liquid is discharged. At the portion where the curing material liquid is sent from the supply pipe 108 to the curing material liquid injection nozzle 110, that is, at the curved portion of the pipeline, a part of the flow of the curing material liquid becomes a swirling flow, and in front of the curing material liquid injection nozzle 110. A part of the flow of the curing material liquid becomes turbulent, and the flow of the curing material liquid flowing inside the curing material liquid injection nozzle 110 is turbulent and the flow velocity difference between the inner peripheral portion and the central portion of the curing material liquid injection nozzle 110. As a result, power loss of the curing material liquid injected from the curing material liquid injection nozzle 110 is caused. As described above, when the power loss of the curing material liquid injected from the curing material liquid injection nozzle 110 occurs, the cutting ability of the curing material liquid injected from the curing material liquid injection nozzle 110 is reduced and the injection distance is shortened. was there.

As described above, in the conventional ground improvement device, the injection distance is shortened due to the power loss of the curing material liquid injected from the curing material liquid injection nozzle. In order to eliminate this, the curing material liquid is eliminated. A wide range of ground has been improved by lengthening the injection time of the curing material liquid injected from the injection nozzle and shortening the interval at which the injection rod is pulled upward. However, if a wide range of ground is improved by such a method, the construction period of the ground improvement work will be lengthened and the construction efficiency will be lowered, and as a result, the construction cost of the ground improvement work will increase. there were. Further, as a method of injecting the curing material liquid from the curing material liquid injection nozzle to a long distance, there is also a method of increasing the supply pressure of the curing material liquid supplied to the curing material liquid injection nozzle. Since the cured material liquid is supplied to the material liquid injection nozzle at a high pressure, the peripheral equipment is consumed severely, and there is a possibility that such consumption may cause a problem of ground improvement.

Further, as shown in FIG. 7, which will be described later, the outlet diameter d of the injection nozzle, the length L of the portion having the same diameter at the tip of the injection nozzle, the length LL of the total length of the injection nozzle, and the same tip of the injection nozzle from the rear end of the injection nozzle. It is known that the cured material liquid is ejected from the injection nozzle to a long distance if the following relational expression is satisfied when the aperture angle B up to the diameter portion is set. Here, FIG. 7 is a drawing of the first embodiment of the present invention, and the description here focuses only on the injection nozzle.

In recent years, there have been many requests for the formation of a large-diameter underground consolidated body, and in order to create such a large-diameter underground consolidated body, it is necessary to increase the outlet diameter d of the injection nozzle. However, when the outlet diameter d of the injection nozzle becomes large, in order to satisfy the relational expression of the above equations 1 to 3, the length L of the tip same diameter portion of the injection nozzle and the total length of the injection nozzle are inevitably long. It is necessary to increase the length of the LL, which causes a problem that the outer shape of the monitor becomes large. Furthermore, if the outer shape of the monitor becomes larger, the injection rod also becomes larger, the entire injection rod becomes heavier, and the boring machine that supports it also becomes larger, which increases the construction cost of ground improvement. The problem arises.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a high-pressure injection nozzle device capable of injecting a cured material liquid from a high-pressure injection nozzle over a long distance and a ground improvement device equipped with the high-pressure injection nozzle device. To do.

In order to solve the above problems and achieve the above object, the one according to the first aspect of the present invention communicates with the inside of the curing material liquid supply pipe formed in the axial direction in the injection rod and with the tip of the injection rod. A high-pressure injection nozzle device provided on the side surface of a connected monitor, which communicates with a tapered intermediate inner diameter portion formed by reducing the diameter of the inner peripheral surface toward the tip and the tip of the intermediate inner diameter portion, and has a diameter. Is substantially the same diameter as the tip diameter of the intermediate inner diameter portion, and communicates with the rear end of the intermediate inner diameter portion, and the diameter is substantially the same as the diameter of the rear end of the intermediate inner diameter portion, or from the same diameter. It has a nozzle body having a hollow shape consisting of a rear end inner diameter formed by expanding the diameter toward the rear end, and the rear end inner diameter of the nozzle body is formed in the axial direction in the monitor. At least about 1/3 of the cross section of the cured material liquid flow path is provided so as to project, and a flow path dividing portion for dividing the hollow cross section into a plurality of spaces is formed, and an inner diameter portion at the rear end of the nozzle body portion is formed. After the hardener liquid flowing through the water is stratified more finely in each space divided by the flow path dividing portion, the diameter is reduced in a hollow space where there is no tangible object in the middle inner diameter portion and sent toward the tip. Therefore, the cutting ability of the hardened material liquid jetted from the inner diameter portion of the tip of the nozzle main body portion is increased, and the hardened material liquid can be jetted to a longer distance.

When the curing material liquid changes direction from the direction of the curing material liquid supply pipe in the injection rod to the hollow shape direction of the nozzle body in the monitor, a part of the flow of the curing material liquid swirls at the curved part of the pipeline. At the same time, a part of the flow of the curing material liquid becomes turbulent in front of the nozzle body, but according to the present invention, the curing material liquid is caused by the flow path dividing portion of the inner diameter of the rear end of the nozzle body. By being finely divided, the turbulent flow state of the cured material liquid is disrupted, and the cured material liquid is laminarized more finely while the flow velocity distribution is made uniform in each of the divided spaces. Then, the laminarized curing material liquid greatly increases the flow velocity while being rectified at the intermediate inner diameter portion of the nozzle body formed by reducing the inner peripheral surface toward the tip, and the curing increases the flow velocity. Straightness is greatly increased at the tip inner diameter portion of the nozzle body portion where the material liquid has substantially the same diameter as the tip diameter of the intermediate inner diameter portion of the nozzle body portion. As described above, the cutting ability of the hardened material liquid ejected from the tip of the nozzle main body is further increased, so that the tissue structure of the ground can be destroyed and the hardened material liquid can be ejected to a longer distance. Further, since the inner diameter of the rear end of the nozzle body is provided so as to project inside the curing material liquid flow path in the monitor, the linear distance through which the curing material liquid flows inside the nozzle body can be long, and turbulence can occur. Is extremely reduced, the cutting ability of the cured material liquid ejected from the tip of the nozzle body is increased, and the cured material liquid can be injected over a long distance.

The second aspect of the present invention is a ground improvement device having a monitor equipped with the high-pressure injection nozzle device according to the first aspect.

According to the high-pressure injection nozzle device of the present invention, the cured material liquid is finely divided by the flow velocity dividing portion of the inner diameter of the rear end of the nozzle body, so that the turbulent flow state of the cured material liquid is disrupted and the cured material liquid is broken. Is laminarized more finely while the flow velocity distribution is made uniform in each of the divided spaces. Then, the laminarized curing material liquid greatly increases the flow velocity while being rectified at the intermediate inner diameter portion of the nozzle body formed by reducing the inner peripheral surface toward the tip, and the curing increases the flow velocity. Straightness is greatly increased at the tip inner diameter portion of the nozzle body portion where the material liquid has substantially the same diameter as the tip diameter of the intermediate inner diameter portion of the nozzle body portion. As a result, the cutting ability of the hardened material liquid jetted from the tip of the nozzle body is further increased, so that the tissue structure of the ground can be destroyed and the hardened material liquid can be jetted to a longer distance. Further, since the inner diameter of the rear end of the high-pressure injection nozzle device is provided so as to project inside the curing material liquid flow path in the monitor, the linear distance through which the curing material liquid flows inside the nozzle body can be lengthened, which is disturbed. The generation of flow is extremely reduced, the cutting ability of the cured material liquid ejected from the tip of the nozzle body is increased, and the cured material liquid can be injected over a long distance.

It is a figure which shows the construction state of the ground improvement apparatus to which the high pressure injection nozzle apparatus is mounted according to 1st Embodiment of this invention. (A) FIG. 3 is an external perspective view of a monitor equipped with the same high-pressure injection nozzle device. (B) It is a figure which shows the coupling pin which connects the injection rod and a monitor. FIG. 2 is a cross-sectional view taken along the line AA of FIG. (A) is an enlarged view of the PP portion of FIG. (B) It is a figure which shows the nozzle body part mounting hole of a monitor. It is a figure which shows the component part of the high pressure injection nozzle apparatus in 1st Embodiment of this invention. It is sectional drawing of the same component. It is a figure which shows the dimension of the high pressure injection nozzle apparatus in 1st Embodiment of this invention. FIG. 3 is a cross-sectional view taken along the line BB of FIG. FIG. 3 is a sectional view taken along the line CC of FIG. It is a figure which shows the assembly method of the high pressure injection nozzle apparatus and its peripheral apparatus in 1st Embodiment of this invention. It is a figure which shows the mounting method of the high pressure injection nozzle device. (A) It is an enlarged view of the PP portion of FIG. 3 of the high pressure injection nozzle device according to the second embodiment of the present invention. (B) It is a figure which shows the nozzle body part mounting hole of a monitor. It is a figure which shows the component part of the high pressure injection nozzle apparatus in 2nd Embodiment of this invention. It is sectional drawing of the same component. It is sectional drawing of the high pressure injection nozzle device attached to a monitor. (A) It is an enlarged view of the PP portion of FIG. 3 of the high pressure injection nozzle device according to the third embodiment of the present invention. (B) It is a figure which shows the nozzle body part mounting hole of a monitor. It is a figure which shows the component part of the high pressure injection nozzle apparatus in 3rd Embodiment of this invention. It is sectional drawing of the same component. It is sectional drawing of the high pressure injection nozzle device attached to a monitor. It is a figure which shows the nozzle body part attached to the downward nozzle body part mounting hole of the modification 1 of this invention. It is a figure which shows the nozzle body part attached to the upward nozzle body part mounting hole of the modification 2 of this invention. It is a figure which shows the flow path division part formed in the rear end inner diameter part inside the nozzle body extension part of the modification 3 of this invention. (A) It is a figure which shows the mounting position of the high pressure injection nozzle device of the modification 4 of this invention. (B) It is sectional drawing of the monitor mounting position of the high pressure injection nozzle apparatus of the modification 4 of this invention. It is a figure which shows the flow path stopper mounted in the nozzle body part mounting hole 23 of the modification 5 of this invention. (A) It is an enlarged view of the PP part of FIG. 3 of the modification 6 of this invention. (B) is a figure which shows the nozzle body part mounting hole of a monitor. It is a figure which shows the component part of the high pressure injection nozzle device in the modification 6 of this invention. It is sectional drawing of the same component. (A) It is an enlarged view of the PP part of FIG. 3 of the high pressure injection nozzle device in the modification 8 of this invention. (B) It is a figure which shows the nozzle body part mounting hole of a monitor. It is a figure which shows the component part of the high pressure injection nozzle apparatus. It is sectional drawing of the same component. It is a figure which shows the mounting method of the high pressure injection nozzle device. It is a front sectional view of the conventional injection rod.

(First Embodiment) Hereinafter, the first embodiment of the high-pressure injection nozzle device 1 of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a construction status of a ground improvement device to which a high-pressure injection nozzle device according to the first embodiment of the present invention is mounted.

As shown in FIG. 1, the monitor 3 is attached to the tip of the injection rod 2 in combination. Water (liquid) supplied from the injection rod 2 and the inside of the monitor 3 is ejected from the tip nozzle 4 provided at the tip of the monitor 3, and from the high-pressure injection nozzle device 1 provided on the side surface of the monitor 3. Is injected with cement milk (hardener liquid) and air supplied through the injection rod 2 and the monitor 3.

The working machine 5 is a machine that supports the injection rod 2 and moves, rotates, and swings the injection rod 2 up and down. As a result, the injection rod 2 and the monitor 3 can be rotated and swung as well as vertically moved by the working machine 5.

A swivel 6 is attached to the rear end of the injection rod 2. Further, the injection rod 2 is composed of a double pipe, cement milk or water (liquid) is supplied to the cement milk combined water supply path 7 inside the injection rod 2, and the outer air supply path inside the injection rod 2 is supplied. Air is supplied to No. 8 (see FIG. 3). In the first embodiment, the cement milk combined water supply path 7 is used to configure the cement milk (hardening material liquid) supply pipe and the water supply pipe as one supply pipe, but the present invention is not limited to this. The (hardening material liquid) supply pipe and the water supply pipe may be configured as separate supply pipes. Further, when the cement milk (hardening material liquid) supply pipe and the water supply pipe are configured as separate supply pipes in this way, a multiple pipe such as a triple pipe that separates the cement milk (hardening material liquid) and water. Or a perforated tube may be used. Further, in the first embodiment, the inside of the injection rod 2 composed of the double pipe is the cement milk combined water supply passage 7, and the outside is the air supply passage 8, but the present invention is not limited to this and is composed of the double pipe. The inside of the injection rod 2 to be formed may be an air supply path, and the outside may be a cement milk combined water supply path.

The monitor 3 is attached to the tip of the injection rod 2 as described above. Then, inside the monitor 3, a cement milk combined water flow path 9 communicating with the cement milk combined water supply path 7 of the injection rod 2 is formed in the axial direction, and injection is performed on the outer peripheral side of the cement milk combined water flow path 9. Four air flow paths 10 communicating with the air supply passage 8 of the rod 2 are formed in the axial direction (see FIGS. 3 and 8). Details of the air flow path 10 will be described later. In the first embodiment, the cement milk combined water flow path 9 is used to configure the cement milk (hardening material liquid) flow path and the water flow path as one flow path, but the present invention is not limited to this, and cement milk (hardening) is not limited to this. The material liquid) flow path and the water flow path may be configured as separate flow paths.

The swivel 6 includes water, air, and cement milk supply hoses 14, 15, and 16, which are supplied from the water supply source 11, the air supply source 12, and the cement milk (hardener liquid) supply source 13, respectively. In addition to being connected, water, air, and cement milk are supplied to the air supply path 8 provided in the injection rod 2 and the cement milk combined water supply path 7 (see FIG. 1). In this way, the cement milk, air, and water supplied from the water supply source 11, the air supply source 12, and the cement milk supply source 13, respectively, are the supply hoses 14, 15, 16 → swivel 6 → each. It is injected from a nozzle or the like through the supply paths 7 and 8 → each flow path 9 and 10. Here, water and cement milk are supplied to the cement milk combined water supply path 7 from the water and cement milk supply hoses 14 and 16, respectively.

Next, the configurations of the injection rod 2 and the monitor 3 will be specifically described with reference to FIGS. 2 to 9. FIG. 2A is an external perspective view of a monitor equipped with the high-pressure injection nozzle device according to the first embodiment of the present invention, and FIG. 2B is a diagram showing a coupling pin for connecting the injection rod and the monitor. 3 is a cross-sectional view taken along the line AA of FIG. 2, FIG. 4A is an enlarged view of a PP portion of FIG. 3, and FIG. 4B is a view showing a mounting hole for a nozzle body of a monitor. Is. Here, in FIG. 2A and FIG. 3, the upper side of the injection rod 2 is omitted.

As shown in FIG. 2A, the injection rod 2 is attached in combination with the monitor 3 as described above. The connection between the injection rod 2 and the monitor 3 will be described later. Here, as the injection rod 2, a double tube composed of an injection rod outer tube 17 having an outer diameter of 45 mm and an inner diameter of 37 mm and an injection rod inner tube 18 having an outer diameter of 24 mm and an inner diameter of 14 mm is used. The lower portion of the injection rod outer tube 17 has an inner diameter of 42 mm, a coupling pin insertion hole 19 is formed in the lower portion thereof, and a coupling pin injection rod recess 20a having substantially the same diameter as the semi-outer circumference of the coupling pin 36 is formed on the lower inner surface. (See FIG. 10). Further, the outer diameter of the injection rod inner pipe 18 is 22 mm from the upper end of the inner diameter 42 mm of the lower portion of the injection rod outer pipe 17 to a little lower part. Further, the monitor 3 has a maximum outer diameter DD of 68 mm, a cement milk combined water flow path 9 having a diameter of 14 mm is formed inside the monitor 3, and the monitor 3 has an outer diameter of 42 mm and an inner diameter of 37 mm. A monitor inner tube 18a having an outer diameter of 24 mm and an inner diameter of 14 mm is formed of 17a, and an air flow path 10 is formed between the monitor outer tube 17a and the monitor inner tube 18a (see FIG. 3). The air flow path 10 is composed of a flow path between the monitor outer tube 17a and the monitor inner tube 18a, and four flow paths formed inside the monitor 3 communicating with the flow path (the air flow path 10). (See FIG. 8). In this way, the air supply path 7 in the injection rod 2 and the air flow path 10 in the monitor 3 communicate with each other. As described above, a high-pressure injection nozzle device 1 for injecting cement milk and air is provided on the side surface of the monitor 3, and a coupling pin monitor recess 20b having a diameter substantially the same as the half outer circumference of the coupling pin 36 is formed on the upper portion of the side surface. (See FIG. 10). Further, a tip nozzle 4 for injecting water (liquid) is provided at the tip of the monitor 3. In the first embodiment, the injection rod 2 having a circular cross section having an outer diameter of about 45 mm is used, but the present invention is not limited to this, and an injection rod having a circular cross section having a diameter of about 50 mm to 140 mm (for example, about 75 mm) may be used. Also, when an injection rod having a circular cross section having a diameter of about 50 mm to 140 mm (for example, about 75 mm) is used, the inner diameter of the injection rod inner pipe 18 may be 14 mm to 16 mm. Here, the inner diameter of the injection rod inner pipe 18 is determined by the flow rate of cement milk flowing in the injection rod inner pipe 18. Further, an injection rod having a hexagonal cross section may be used. Further, the coupling pin 36 is composed of a spring pin 36a and a spring pin 36b (see FIG. 2B). In this coupling pin 36, the spring pin 36b is first inserted into the coupling pin insertion hole 19 at the lower part of the injection rod 2, and then the spring pin 36a is press-fitted into the hollow portion of the spring pin 36b inserted into the coupling pin insertion hole 19. To.

As shown in FIG. 3, the high-pressure injection nozzle device 1 is formed with a material liquid injection nozzle 21 for injecting cement milk and an air injection nozzle 22 for injecting compressed air. Specifically, the material liquid injection nozzle 21 is provided inside the high-pressure injection nozzle device 1, and the air injection nozzle 22 is formed outside. In this way, when cement milk and compressed air are jetted from the high-pressure jet nozzle device 1 at high pressure, cement milk is jetted from the inside of the high-pressure jet nozzle device 1, and compressed air is jetted from the outside (outer peripheral portion) of the cement. By forming a vapor layer film of compressed air around the jet of milk, the jet reach can be increased as compared with the case where there is no air layer film of compressed air.

The material liquid injection nozzle 21 is formed at the tip of the nozzle body 24 inserted into the nozzle body mounting hole 23 (see FIG. 4). Here, as described above, two nozzle main body mounting holes 23 are formed at positions where the heights of the monitors 3 in the axial direction are different, at equal intervals on the circumference. In the first embodiment, it is assumed that two nozzle main body mounting holes 23 are formed at positions where the heights of the monitor 3 in the axial direction are different at equal intervals on the circumference, but the shaft of the monitor 3 is formed. The heights in the directions may not be at different positions at equal intervals, and may not be formed at positions at equal intervals on the circumference. Further, the number of nozzle body mounting holes 23 does not have to be two, and a plurality or one of two or more (preferably four or more) such as three, four, and six is formed. It may be.

In this way, since a plurality of nozzle main body mounting holes 23 are formed at positions where the heights of the monitors 3 in the axial direction are different, the nozzle main body 24 can be mounted in different nozzle main body mounting holes 23 according to the application. As a result, consolidated bodies of various shapes can be efficiently formed in a short time.

Further, the air injection nozzle 22 is formed from an outer peripheral surface of the nozzle body 24 and an inner peripheral surface of the air cover 25. Then, compressed air is injected from the air injection nozzle 22 at high speed from the air flow path 10 in the monitor 3 through the flow path whose cross-sectional area is reduced toward the tip. In the first embodiment, the air injection nozzle 22 is formed from the outer peripheral surface of the nozzle body 24 and the inner peripheral surface of the air cover 25, but the present invention is not limited to this, and the air flow path 10 in the monitor 3 is not limited to this. If the nozzle is configured to surround the inner diameter of the tip of the nozzle body 24, the cross-sectional area is reduced from the air flow path 10 in the monitor 3 toward the tip, and compressed air is injected at high speed. , Other forms of air injection nozzles may be used.

The nozzle body 24 is composed of a nozzle body 26 and a nozzle body extension 27 (see FIG. 5). In the first embodiment, both the nozzle body 26 and the nozzle body extension 27 are molded from a high-strength material such as cemented carbide. The nozzle body 26 has a cylindrical shape with a smaller diameter at the front portion and a cylindrical shape with a slightly larger diameter at the rear portion than the front portion. The hollow interior of the nozzle body 24 is composed of a rear end inner diameter portion 28, an intermediate inner diameter portion 29, and a tip inner diameter portion 30 (see FIG. 6). Here, FIG. 5 is a diagram showing components of the high-pressure injection nozzle device according to the first embodiment of the present invention, and FIG. 6 is a cross-sectional view of the components. The intermediate inner diameter portion 29 and the tip inner diameter portion 30 are formed in the nozzle body 26, and the rear end inner diameter portion 28 is formed in the nozzle body extension portion 27. Here, in the first embodiment, the length of the rear end inner diameter portion 28 is 9 mm, the length of the intermediate inner diameter portion 29 is 15 mm, and the length L of the tip inner diameter portion 30 is 8 mm (see FIG. 7). .. The intermediate inner diameter portion 29 has a tapered surface whose inner peripheral surface is reduced in diameter at a drawing angle β of 12 degrees to 20 degrees (preferably 12 degrees to 15 degrees, more preferably 12 degrees to 13 degrees) toward the tip end. The tip inner diameter portion 30 is formed so as to communicate with the tip of the intermediate inner diameter portion 29, the inner diameter d of the hollow shape is substantially the same as the diameter of the tip of the intermediate inner diameter portion 29, and the length L is the intermediate inner diameter portion. The diameter d of the tip of 29 is 2 to 4 times (preferably 3 to 4 times) the diameter d. Here, in the first embodiment, the diameter d of the tip inner diameter portion 30 is formed to be 2 mm. Further, the rear end inner diameter portion 28 communicates with the rear end of the intermediate inner diameter portion 29, and the inner diameter of the communicating portion is formed to be substantially the same as the diameter of the rear end of the intermediate inner diameter portion 29. Here, FIG. 7 is a diagram showing the dimensions of the high-pressure injection nozzle device according to the first embodiment of the present invention. Then, when the nozzle main body 24 is attached to the monitor 3, it is in a state of protruding 7 mm into the cement milk combined water flow path 9 (curing material liquid flow path) in the monitor 3. Here, the length of the nozzle body 24 protruding into the cement milk combined water flow path 9 (hardened material liquid flow path) in the monitor 3 is the cement milk combined water flow path 9 (hardened material liquid flow path) in the monitor 3. It is half (D / 2) of the diameter (D) of (see FIGS. 7 to 9). Here, FIG. 8 is a sectional view taken along the line BB of FIG. 3, and FIG. 9 is a sectional view taken along the line CC of FIG. In the first embodiment, the total length LL (32 mm) of the nozzle body 24 is 16 times the diameter d (2 mm) of the tip of the intermediate inner diameter 29, but the present invention is not limited to this. The total length LL of the portion 24 may be formed to be 15 to 20 times the diameter of the tip of the intermediate inner diameter portion 29, and if the total length LL of the nozzle main body portion 24 cannot be increased, the nozzle main body portion The total length LL of 24 may be formed to be 10 to 20 times the diameter d of the tip of the intermediate inner diameter portion 29. Further, the rear end inner diameter portion 28 inside the nozzle body extension portion 27 is formed with a flow path dividing portion 31 that divides the cross section of the hollow rear end inner diameter portion 28 into a plurality of spaces. The flow path dividing portion 31 is formed in a cross shape having a width of 1.5 mm, a length of 5.5 mm, and a depth of 5.0 mm (see FIG. 5). The depth length of the flow path dividing portion 31 is not limited to 5.0 mm, and may be formed to a predetermined length.

The nozzle body support 32 is attached from the front outer peripheral surface of the nozzle body 26, has a hexagonal tip outer peripheral surface, and has a male screw formed on the rear outer peripheral surface. Further, the air cover 25 has a hexagonal tip outer peripheral surface, male screws are formed on the intermediate outer peripheral surface, and notches 33 are formed at the rear end portion of the intermediate outer peripheral surface at equal intervals in the circumferential direction. (See Fig. 5). The notch 33 is provided to secure a flow path for compressed air when the air cover 25 is attached to the monitor 3. Further, the hollow inside of the air cover 25 has a tapered shape formed by reducing the diameter from the notch 33 toward the tip (see FIG. 6).

The cement milk supplied via the cement milk combined water supply pipe 7 in the injection rod 2 and the cement milk combined water flow path 9 in the monitor 3 is supplied to the nozzle body 24 in the order of the nozzle body extension 27 → the nozzle body 26. It is fed into the material and injected from the material liquid injection nozzle 21 (see FIG. 8). Further, the compressed air supplied through the air supply path 8 in the injection rod 2 and the air flow path 10 in the monitor 3 is injected from the air injection nozzle 22 (see FIG. 8). Here, the air injection nozzle 22 communicates with the two air flow paths 10. As described above, the high-pressure injection nozzle device 1 in the first embodiment is composed of the nozzle body portion 24 including the nozzle body 26 and the nozzle body extension portion 27, the nozzle body portion support 32, and the air cover 25.

A differential pressure valve 34 is provided at the lower part of the monitor 3 (see FIG. 3). At the time of drilling, low-pressure water is supplied to the cement milk combined water flow path 7 of the injection rod 2, and this low-pressure water is ejected from the tip nozzle 4 via the differential pressure valve 34. After the drilling is completed, the injection rod When the cement milk is supplied to the cement milk combined water flow path 7 of No. 2, the differential pressure valve 34 is closed, and the cement milk is injected from the material liquid injection nozzle 21 (high pressure injection nozzle device 1).

Next, a method of assembling the injection rod 2, the monitor 3, and the high-pressure injection nozzle device 1 will be described with reference to FIGS. 10 and 11. Here, FIG. 10 is a diagram showing a method of assembling the high-pressure injection nozzle device and its peripheral equipment according to the first embodiment of the present invention, and FIG. 11 is a diagram showing a method of mounting the high-pressure injection nozzle device.

As shown in FIG. 10, first, the lower end of the injection rod 2 is inserted from the upper part of the monitor upper pipe 35. When inserting the injection rod 2, the semicircular injection rod protrusion 44 formed at the lower end of the injection rod outer tube 17 and the semicircular monitor upper tube inner protrusion 45 formed at the upper part of the monitor upper tube 35 are inserted. By fitting, the monitor upper tube 35 and the injection rod 2 are aligned in the circumferential direction and attached. Then, the coupling pin 36 is inserted from the coupling pin insertion hole 19 at the bottom of the injection rod 2, and the coupling pin 36 is inserted into the coupling pin injection rod recess 20a at the bottom of the injection rod inner tube 18 and the coupling pin monitor recess 20b at the top of the monitor upper tube 35. By fitting, the monitor 3 is coupled to the injection rod 2. In the first embodiment, the upper part and the lower part of the upper end of the air flow path 10 formed of four pieces in the monitor upper tube 35 have been described as one, but the present invention is not limited to this, and four pieces are formed in the monitor upper part tube 35. The upper part and the lower part of the upper end of the air flow path 10 may be configured as separate bodies. By configuring as a separate body in this way, it becomes easy to form the four air flow paths 10 in the monitor upper pipe 35.

Next, the high-pressure injection nozzle device 1 is attached to the nozzle body portion mounting hole 23 formed on the side surface of the monitor upper tube 35 (see FIG. 11). Specifically, the high-pressure injection nozzle device 1 is attached to the nozzle main body attachment hole 23 of the monitor upper tube 35 by the following procedures (1) to (3).

(1) The nozzle body extension portion 27 is inserted from the rear portion of the nozzle body 26, and the male screw formed on the outer periphery of the tip of the nozzle body extension portion 27 and the female screw formed on the inner circumference of the rear end of the nozzle body 26 are screwed. By matching, the nozzle body extension portion 27 is attached to the nozzle body 26.

(2) Next, the nozzle body support 32 is fitted from the tip direction of the nozzle body 26 to which the nozzle body extension 27 is attached, and is inserted into the nozzle body mounting hole 23 in that state. When the nozzle body support 32 is inserted into the nozzle body mounting hole 23, it is formed in the male screw formed on the outer periphery of the rear end of the nozzle body support 32 and in the nozzle body mounting hole 23 of the monitor 3. By screwing the female screw, the nozzle body support 32 (including the nozzle body 26 and the nozzle body extension 27) is attached to the monitor 3. The nozzle body extension 27 attached in this way is attached so as to project to a substantially central portion of the cement milk combined water flow path 9 (hardened material liquid flow path) in the monitor 3 (see FIG. 7). In other words, the rear end inner diameter portion 28 of the nozzle body portion 24 attached to the monitor 3 projects to the substantially central portion (D / 2) of the cement milk combined water flow path 9 (curing material liquid flow path) in the monitor 3. Can be installed. In the first embodiment, the rear end inner diameter portion 28 of the nozzle body portion 24 attached to the monitor 3 is attached so as to project to the substantially central portion of the cement milk combined water flow path 9 in the monitor 3. However, the cement milk combined water flow path 9 in the monitor 3 may be projected to at least about 1/3 of the cross section, and the height in the axial direction of the monitor 3 as in the first embodiment. When a plurality of nozzle body mounting holes 23 are formed at different positions, at least about 1/2 to about 2/3 (preferably about 2/3) of the cross section of the cement milk combined water flow path 9 in the monitor 3. ) May be projected.

(3) Next, the air cover 25 is fitted from the tip of the nozzle body 26, and the male screw formed on the outer periphery of the air cover 25 and the female screw formed in the air cover mounting hole 43 on the inner circumference of the side surface of the monitor 3 are inserted. By screwing, the air cover 25 is attached to the monitor 3.

Next, a monitor lower pipe 39 having a pressure differential valve 34 built in is attached to the lower part of the monitor upper pipe 35. Specifically, the monitor lower tube 39 is attached to the monitor upper tube 35 by screwing the male screw on the upper outer circumference of the monitor lower tube 39 and the female screw on the lower inner circumference of the monitor upper tube 35.

In this way, the rear end inner diameter portion 28 of the nozzle body portion 24 is provided so as to project to the substantially central portion of the cement milk combined water flow path 9 (hardener liquid flow path) in the monitor 3, so that the straight line inside the nozzle body portion 24 is provided. It is possible to secure a sufficiently long distance, reduce the occurrence of turbulent flow of cement milk flowing in the nozzle body 24, and increase the cutting ability of cement milk jetted from the tip of the nozzle body 24. As a result, the tissue structure of the ground can be destroyed and cement milk can be sprayed over a long distance.

Further, since the cement milk flowing through the rear end inner diameter portion 28 of the nozzle body portion 24 is divided into the respective spaces divided by the flow path dividing portion 31 and sent toward the tip end, the cement milk is divided by the flow path dividing portion 31. It is possible to make the layer flow more finely in each of the created spaces, and by increasing the cutting ability of the cement milk injected from the material liquid injection nozzle 21 at the tip of the nozzle body 24, the structure of the ground is destroyed. Cement milk can be sprayed over longer distances.

As described above, the male screw formed on the outside of the outer peripheral surface of the nozzle body 24 and the female screw formed on the inner peripheral surface of the nozzle body mounting hole 23 of the monitor 3 are screwed together to form the nozzle body. Since the 24 is detachably attached to the monitor 3, the nozzle main body 24 can be freely replaced according to the application, and the nozzle main body 24 can be attached to the monitor 3 by a simple method.

Next, the construction procedure by the ground improvement device equipped with the monitor equipped with the high-pressure injection nozzle device according to the first embodiment of the present invention will be briefly described.

First, after positioning the injection rod 2 at a position to be excavated, water (liquid) is injected from the tip nozzle 4 of the injection rod 2 at that position to drill a hole to a predetermined depth. Then, after the holes are drilled to a predetermined depth, cement milk is injected from the material liquid injection nozzle 21 and compressed air is injected from the air injection nozzle 22 while swinging the injection rod 2. Specifically, the injection rod 2 is swung by 30 degrees (predetermined angle) while injecting cement milk together with compressed air from the injection nozzles (material liquid injection nozzle 21, air injection nozzle 22).

Next, with the injection rod 2 swung 30 degrees, the injection rod 2 is pulled up by a predetermined length (for example, 5 cm or less (preferably 2.5 cm)), and the injection nozzle (material liquid injection nozzle 21, Until the injection from the air injection nozzle 22) is completed, clockwise swing injection → injection rod 2 pulling → counterclockwise swing injection → injection rod 2 pulling → clockwise swing injection → injection rod 2 pulling It is repeated. In the first embodiment, the injection rod 2 is swung, but the present invention is not limited to this, and the injection rod 2 may be rotated in one direction (clockwise or counterclockwise).

Next, the injection rod 2 is pulled up from the excavation hole by the crane and is extracted from the excavation hole. By doing so, a fan-shaped consolidated body is created in the ground.

(Second Embodiment)
Next, a second embodiment of the high-pressure injection nozzle device of the present invention will be described with reference to the drawings. Here, FIG. 12A is an enlarged view of a PP portion of FIG. 3 of the high-pressure injection nozzle device according to the second embodiment of the present invention, and FIG. 12B shows a nozzle main body mounting hole of the monitor. FIG. 13 is a diagram showing components of a high-pressure injection nozzle device according to a second embodiment of the present invention. FIG. 14 is a cross-sectional view of the same component.

The main difference between the second embodiment and the first embodiment of the present invention is that in the first embodiment, the nozzle body 26 constituting the nozzle body 24 and the nozzle body extension 27 are separately configured. On the other hand, in the second embodiment, the nozzle body constituting the nozzle body portion of the first embodiment and the nozzle body extension portion are integrally formed, and in the first embodiment, the nozzle main body is formed.

While the body portion 24 protrudes to the substantially central portion of the cement milk combined water flow path 9 in the monitor 3, in the second embodiment, the nozzle body portion 24x protrudes into the cement milk combined water flow path 9 of the monitor 3x. I'm in the process of not letting it. In the second embodiment, the differences from the first embodiment will be mainly described. Further, in the second embodiment, the same reference numerals are used for the same configurations (including approximate configurations) as those in the first embodiment, and the same effects and effects are exhibited, and the description thereof will be omitted.

In the present embodiment, the inner surface portion of the nozzle body portion 24x and the entire nozzle body rear member 48x are molded from a high-strength material such as cemented carbide. Here, the nozzle body rear member 48x has a hollow cylindrical shape whose front portion has a larger diameter than the nozzle main body portion 24x rear portion and a rear portion having a smaller diameter than the front portion. In the present embodiment, the inner surface of the nozzle body 24x is molded from a high-strength material such as cemented carbide, but the present invention is not limited to this, and the entire nozzle body 24x is made of a high material such as cemented carbide. It may be molded from a strong material. The outer shape of the nozzle body 24x is such that the front part has a substantially cylindrical shape with a smaller diameter at the tip, the middle part has a cylindrical shape with a slightly larger diameter than the front part, and the rear part has a slightly larger diameter than the middle part. It has a cylindrical shape. Further, an O-ring mounting recess 47x is formed on the rear end surface of the nozzle body 24x (see FIG. 14B).

The hollow-shaped interior of the nozzle body portion 24x is composed of a rear end inner diameter portion 28x, an intermediate inner diameter portion 29x, and a tip inner diameter portion 30x (see FIG. 14B). Here, in the second embodiment, the rear end inner diameter portion 28x has a length of 5.0 mm, the intermediate inner diameter portion 29x has a length of 5.5 mm, and the tip inner diameter portion 30x has a length of 8.0 mm. .. The intermediate inner diameter portion 29x has a tapered surface shape whose inner peripheral surface is reduced in diameter at a drawing angle β of 12 degrees to 20 degrees (preferably 12 degrees to 15 degrees, more preferably 12 degrees to 13 degrees) toward the tip end. The tip inner diameter portion 30x communicates with the tip of the intermediate inner diameter portion 29x, the inner diameter d of the hollow shape is substantially the same as the diameter of the tip of the intermediate inner diameter portion 29x, and the length L is the intermediate inner diameter. The diameter d of the tip of the portion 29x is 2 to 4 times (preferably 3 to 4 times) the diameter d. Here, in the second embodiment, the diameter of the tip inner diameter portion 30x is formed to be 4.0 mm (see FIG. 14B). In the second embodiment, the total length LL (18.5 mm) of the nozzle body portion 24x is formed to be 4.625 times the diameter d (4 mm) of the tip of the intermediate inner diameter portion 29x, but the present invention is limited to this. Instead, the total length of the nozzle body portion 24x may be formed to be 4 to 20 times the diameter of the tip of the intermediate inner diameter portion 29x. Further, the rear end inner diameter portion 28x communicates with the rear end of the intermediate inner diameter portion 29x, and the inner diameter of the communicating portion is formed to be substantially the same as the diameter of the rear end of the intermediate inner diameter portion 29x. When the nozzle body 24x is attached to the monitor 3x, the nozzle body 24x does not protrude into the cement milk combined water flow path 9 (curing material liquid flow path) of the monitor 3x, and the nozzle body mounting hole 23x of the monitor 3x It will be stored inside. Further, the rear end inner diameter portion 28x of the rear portion of the nozzle body portion 24x is formed with a flow path dividing portion 31x that divides the hollow rear end inner diameter portion 28x cross section into a plurality of spaces. The flow path dividing portion 31x is formed in a cross shape having a width of 2.0 mm, a length of 10.0 mm, and a depth of 3.5 mm (see FIG. 13B). The depth length of the flow path dividing portion 31x is not limited to 3.5 mm, and may be formed to a predetermined length. Further, the length of the nozzle body rear member 48x is 6.5 mm, which communicates with the rear end of the intermediate inner diameter portion 29x, and the inner diameter of the hollow shape is formed to be substantially the same as the diameter of the rear end of the intermediate inner diameter portion 29x. ing. Further, since the air cover 25x and the nozzle body support 32x are almost the same as those in the first embodiment, the description thereof will be omitted.

Next, a method of attaching the high-pressure injection nozzle device 1x to the monitor 3x will be described. The method different from the mounting method of the nozzle body 24 of the first embodiment will be described. Here, FIG. 15 is a cross-sectional view of a high-pressure injection nozzle device mounted on the monitor according to the second embodiment of the present invention.

First, the nozzle body rear member 48x is inserted into the nozzle body mounting hole 23x formed on the side surface of the monitor 3x (see FIGS. 12B and 15). Here, since the nozzle body extension fastening convex portion 38x is formed in the nozzle body portion mounting hole 23x formed on the side surface of the monitor 3x of the present embodiment (see FIGS. 12B and 15). The rear end of the nozzle body rear member 48x is in contact with the nozzle body extension fastening protrusion 38x, and the nozzle body rear member 48x is supported by the nozzle body extension fastening protrusion 38x.

Next, the nozzle body 24x is inserted into the nozzle body mounting hole 23x. The rear end of the nozzle body 24x comes into contact with the nozzle body rear member 48x tip side, but is sealed by the O-ring 46x inserted into the O-ring mounting recess 47x at the rear end of the nozzle body 24x. The nozzle body rear member 48x (including the nozzle body 24x) attached in this way does not protrude into the cement milk combined water flow path 9 (curing material liquid flow path) in the monitor 3x, and the nozzle body portion of the monitor 3x is attached. It is housed in the hole 23x (see FIG. 15).

Next, the high-pressure injection nozzle device 1x including the nozzle body 24x is fitted with the nozzle body mounting hole 23x in the same procedure as the mounting procedure of the first embodiment, such that the air cover 25x is fitted from the tip direction of the nozzle body 24x. Can be attached to. Unlike the first embodiment, the nozzle body rear member 48x (including the nozzle body 24x) attached in this way is attached in a state of being housed in the nozzle body attachment hole 23 formed in the monitor 3x. ing.

As described above, according to the present embodiment, the cement milk is finely divided by the flow path dividing portion 31x of the rear end inner diameter portion 28x of the nozzle main body portion 24x, so that the turbulent flow state of the cement milk is disrupted and the cement milk is broken down. Is laminarized more finely while the flow velocity distribution is made uniform in each of the divided spaces. Then, the laminarized cement milk greatly increased in flow velocity while being rectified by the intermediate inner diameter portion 29x of the nozzle body portion 24x formed by reducing the inner peripheral surface toward the tip end, and the flow velocity increased. The straightness is greatly increased at the tip inner diameter portion 30x of the nozzle body portion 24x, which is substantially the same diameter as the diameter of the tip of the intermediate inner diameter portion 29x of the nozzle body portion 24x. As a result, the cutting ability of the cement milk ejected from the nozzle body 24x tip is further increased, so that the tissue structure of the ground can be destroyed and the cement milk can be ejected to a longer distance. Here, the following modification is also applied to the second embodiment.

(Third Embodiment)
Next, a third embodiment of the high-pressure injection nozzle device 1y of the present invention will be described with reference to the drawings. Here, FIG. 16A is an enlarged view of a PP portion of FIG. 3 of the high pressure injection nozzle device according to the third embodiment of the present invention, and FIG. 16B shows a nozzle main body mounting hole of the monitor. FIG. 17 is a diagram showing components of a high-pressure injection nozzle device according to a third embodiment of the present invention. FIG. 18 is a cross-sectional view of the same component.

The difference between the third embodiment and the first embodiment of the present invention is that in the first embodiment, the nozzle body extension portion 27 is projected to the substantially central portion of the cement milk combined water flow path 9 in the monitor 3. On the other hand, in the third embodiment, the nozzle body extension 27y is not projected into the cement milk combined water flow path 9 of the monitor 3y. In the third embodiment, the differences from the first embodiment will be mainly described. Further, in the third embodiment, the same reference numerals are used for the same configurations (including the approximate configurations) as those in the first embodiment, and the same effects and effects are exhibited, and the description thereof will be omitted.

The nozzle body portion 24y of the present embodiment is composed of a nozzle body 26y and a nozzle body extension portion 27y (see FIG. 18). In the third embodiment, the inner surface portion of the nozzle body 26y and the nozzle body extension portion 27y are molded from a high-strength material such as cemented carbide. The inner surface of the nozzle body 26y is molded from a high-strength material such as cemented carbide, but the present invention is not limited to this, and the entire nozzle body 26y is molded from a high-strength material such as cemented carbide. It may be. The nozzle body 26y has a substantially cylindrical shape with a smaller diameter at the tip at the tip, a cylindrical shape with a slightly larger diameter at the middle portion than the front portion, and a cylindrical shape with a slightly larger diameter at the rear portion than the middle portion. is there. An O-ring mounting recess 47y is formed on the rear end surface of the nozzle body 26y (see FIG. 18B). Further, the nozzle body extension portion 27y has a cylindrical shape in which the front portion has a larger diameter than the rear portion of the nozzle body 26y and the rear portion has a diameter smaller than that in the front portion.

The hollow interior of the nozzle body portion 24y is composed of a rear end inner diameter portion 28y, an intermediate inner diameter portion 29y, and a tip inner diameter portion 30y (see FIG. 18). The intermediate inner diameter portion 29y and the tip inner diameter portion 30y are formed in the nozzle body 26y, and the rear end inner diameter portion 28y is formed in the nozzle body extension portion 27y. Here, in the third embodiment, the length of the rear end inner diameter portion 28y is 7.0 mm, the length of the intermediate inner diameter portion 29y is 10.0 mm, and the length of the tip inner diameter portion 30 is 8.0 mm. .. The intermediate inner diameter portion 29y has a tapered surface shape in which the inner peripheral surface is reduced in diameter at a drawing angle β of 12 degrees to 20 degrees (preferably 12 degrees to 15 degrees, more preferably 12 degrees to 13 degrees) toward the tip end. The tip inner diameter portion 30y communicates with the tip of the intermediate inner diameter portion 29y, the inner diameter of the hollow shape is substantially the same as the diameter of the tip of the intermediate inner diameter portion 29y, and the length L is the intermediate inner diameter portion. It is formed with a diameter of 2 to 4 times (preferably 3 to 4 times) the diameter d of the tip of 29y (see FIG. 18). Here, in the third embodiment, the diameter of the tip inner diameter portion 30y is formed to be 4.0 mm. In the third embodiment, the total length LL (25 mm) of the nozzle body portion 24y is formed to be 6.25 times the diameter d (4 mm) of the tip of the intermediate inner diameter portion 29y, but the present invention is not limited to this. The total length of the nozzle body portion 24y may be formed to be 6 to 20 times the diameter of the tip of the intermediate inner diameter portion 29y. Further, the rear end inner diameter portion 28y communicates with the rear end of the intermediate inner diameter portion 29y, and the inner diameter of the communicating portion is formed to be substantially the same as the diameter of the rear end of the intermediate inner diameter portion 29y. When the nozzle body 24y is attached to the monitor 3y, the nozzle body 24y does not protrude into the cement milk combined water flow path 9 (curing material liquid flow path) of the monitor 3y, and the nozzle body mounting hole 23y of the monitor 3y It will be stored inside. Further, the rear end inner diameter portion 28y inside the nozzle body extension portion 27y is formed with a flow path dividing portion 31y that divides the hollow rear end inner diameter portion 28y cross section into a plurality of spaces. The flow path dividing portion 31y is formed in a cross shape having a width of 2.0 mm, a length of 10.0 mm, and a depth of 4.5 mm (see FIG. 17). The depth length of the flow path dividing portion 31y is not limited to 4.5 mm, and may be formed to a predetermined length. Here, the nozzle body support 32y and the air cover 25y are almost the same as those in the first embodiment, and thus the description thereof will be omitted.

Next, a method of attaching the high-pressure injection nozzle device 1y to the monitor 3y will be described with reference to FIG. The method different from the mounting method of the nozzle body 24 of the first embodiment will be described. Here, FIG. 19 is a cross-sectional view of a high-pressure injection nozzle device mounted on the monitor.

First, the nozzle body extension 27y is inserted into the nozzle body mounting hole 23y formed on the side surface of the monitor 3y (see FIG. 19). Here, since the nozzle body extension fastening convex portion 38y is formed in the nozzle body portion mounting hole 23y formed on the side surface of the monitor 3y of the present embodiment (see FIGS. 16B and 19). The rear end of the nozzle body extension portion 27y is in contact with the nozzle body extension portion fastening convex portion 38y, and the nozzle body extension portion 27y is supported by the nozzle body extension portion fastening convex portion 38y.

Next, the nozzle body 26y is inserted into the nozzle body mounting hole 23y. The rear end of the nozzle body 26y comes into contact with the tip end side of the nozzle body extension 27y, and is sealed by the O-ring 46y inserted into the O-ring mounting recess 47y at the rear end of the nozzle body 26y. The nozzle body extension 27y attached in this way is housed in the nozzle body attachment hole 23y of the monitor 3y (see FIG. 19).

Next, the high-pressure injection nozzle device 1y including the nozzle body 24y is inserted into the nozzle body mounting hole 23y in the same procedure as the mounting procedure of the first embodiment, such that the air cover 25y is fitted from the tip direction of the nozzle body 26y. It is attached. Unlike the first embodiment, the nozzle body extension portion 27y attached in this way is attached in a state of being housed in the nozzle body portion mounting hole 23y in the monitor 3y.

As described above, according to the present embodiment, the cement milk is finely divided by the flow path dividing portion 31y of the rear end inner diameter portion 28y of the nozzle main body portion 24y, so that the turbulent flow state of the cement milk is disrupted and the cement milk is broken down. Is laminarized more finely while the flow velocity distribution is made uniform in each of the divided spaces. Then, the laminarized cement milk greatly increased in flow velocity while being rectified by the intermediate inner diameter portion 29y of the nozzle body portion 24y formed by reducing the inner peripheral surface toward the tip end, and the flow velocity increased. The straightness is greatly increased at the tip inner diameter portion 30y of the nozzle body portion 24y, which is substantially the same diameter as the diameter of the tip of the intermediate inner diameter portion 29y of the nozzle body portion 24y. As a result, the cutting ability of the cement milk ejected from the tip of the nozzle body 24y is further increased, so that the tissue structure of the ground can be destroyed and the cement milk can be ejected to a longer distance. Here, the following modification is also applied to the third embodiment.

It should be considered that the embodiments disclosed this time are exemplary in all respects and not restrictive. The scope of the present invention is shown by the scope of claims rather than the above description, and it is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

Hereinafter, modifications of the present invention will be described.

(Modification example 1)
The difference between the first embodiment and the first embodiment of the present invention is that in the first embodiment, the nozzle body mounting hole 23 of the monitor 3 is formed in a direction perpendicular to the axis of the monitor 3, and the nozzle body mounting hole 23 is formed. In the first modification, the nozzle body mounting hole 23a (including the air cover mounting hole 43a) of the monitor 3 is formed at 30 degrees downward, and the nozzle body mounting hole 23a is formed. The nozzle body portion 24 is mounted on the surface (see FIG. 20). Here, FIG. 20 is a diagram showing a nozzle body portion mounted in the downward nozzle body portion mounting hole of the first modification of the present invention. Hereinafter, a specific description will be given.

Since the nozzle of the monitor 3 is usually installed slightly above the tip of the monitor 3, if a structure exists in front of the tip of the monitor 3 inserted in the ground, cement milk (hardened) to the vicinity of the structure. Although it is not possible to inject the material liquid), as described above, by mounting the nozzle body 24 in the nozzle body mounting hole 23a (including the air cover mounting hole) formed at 30 degrees downward, the material liquid can be injected into the ground. Even if a structure exists in front of the tip of the inserted monitor 3 and the monitor 3 cannot be inserted below the structure, cement milk (hardening material liquid) is poured from the inner diameter of the tip of the nozzle body 24 to the vicinity of the structure. It can be sprayed and a solidified body in close contact with the structure can be created. In the present modification 1, the nozzle body mounting hole 23a is formed at 30 degrees downward, but the present invention is not limited to this, and 45 degrees downward may be formed, or another downward angle may be formed. Further, in the first modification, the nozzle main body mounting hole is formed at the tip of the monitor without mounting the tip nozzle 4 at the tip of the monitor 3, and the nozzle main body 24 or the like is injected into the nozzle main body mounting hole. The nozzle device 1 may be mounted.

(Modification 2)
The difference between the second embodiment of the present invention and the first embodiment is that in the first embodiment, the nozzle body mounting hole 23 of the monitor 3 is formed in a direction perpendicular to the axis of the monitor 3, and the nozzle body mounting hole 23 is formed. In contrast to the case where the nozzle body 24 is mounted on the monitor 3, in the modified example 2, the nozzle body mounting hole 23b (including the air cover mounting hole 43b) of the monitor 3 is formed upward, and the nozzle is formed in the nozzle body mounting hole 23b. The main body 24 has just been attached (see FIG. 21). FIG. 21 is a diagram showing a nozzle body portion mounted in the upward nozzle body portion mounting hole of the second modification of the present invention.

When high-pressure air is injected from the air injection nozzle 22 of the monitor 3, the injected high-pressure air rises to the upper part of the ground and an air layer is formed in the ground. As described above, the nozzle body 24 is mounted in the nozzle body mounting hole 23b formed upward, and cement milk (hardened material liquid) is sprayed upward from the material liquid injection nozzle 21 at the tip of the nozzle body 24. As a result, cement milk (hardening material liquid) can be sprayed over a longer distance using the air layer.

(Modification 3)
The difference between the third embodiment of the present invention and the first embodiment is that in the first embodiment, the hollow cross section of the rear end inner diameter portion 28 of the nozzle body portion 24 is divided into a plurality of spaces. While it was formed in a cross shape with a side width of 1.5 mm, a length of 5.5 mm, and a depth of 5.0 mm, the modified example 3 has a triangular shape with a width of 1.5 mm, a length of 4.5 mm, and a depth of 5.0 mm. (See FIG. 22 (a)). By forming the triangular flow path dividing portion 31a in this way, the inner circumference of the nozzle body portion 24 and each of the triangular vertices of the flow path dividing portion 31a can be connected at three points, and the flow path dividing portion 31a can be connected. The strength of the can be increased. Further, the flow path dividing portion 31v may be formed in the shapes shown in FIGS. 22 (b) to 22 (g). FIG. 22 is a diagram showing a flow path dividing portion formed in the rear end inner diameter portion in the nozzle body extension portion of the modification 3 of the present invention.

(Modification example 4)
The difference between the modified example 4 of the present invention and the first embodiment is that, in the first embodiment, two air injection nozzles 22 are provided and communicate with two air flow paths 10 corresponding to the respective air injection nozzles 22. In contrast to this, in the modified example 4, six air injection nozzles 22 are provided, and two air flow paths 10 (10a and 10b, 10b and 10c, corresponding to the respective air injection nozzles 22) are provided. 10c and 10d, 10d and 10e, 10e and 10f, 10f and 10a) may be communicated with each other. That is, the air flow paths 10 of the monitor 3 may be provided at equal intervals on the circumference to share the air flow paths 10 between the adjacent air injection nozzles 22 (see FIG. 23). By sharing the adjacent air flow paths 10 in this way, the number of air flow paths in the monitor 3 can be reduced, and many air injection nozzles 22 that inject in multiple directions can be attached to the monitor 3. Yes (see Figure 23). Here, FIG. 23 (a) is a diagram showing a mounting position of the high-pressure injection nozzle device of the modified example 4 of the present invention, and FIG. 23 (b) shows a monitor mounting position of the high-pressure injection nozzle device of the modified example 4 of the present invention. It is a sectional view.

(Modification 5)
The difference between the modified example 5 of the present invention and the first embodiment is that in the first embodiment, two (plurality) nozzle main body mounting holes 23 are formed at positions where the heights of the monitor 3 in the axial direction are different. While the nozzle body 26 is attached to each nozzle body mounting hole 23, in the modified example 5, the nozzle body mounting hole 23 is closed by using the flow path closing tool 40, and cement milk and compressed air are introduced. It has just been made impossible to inject (see FIG. 24). Here, FIG. 24 is a diagram showing a flow path closing tool mounted in the nozzle body portion mounting hole 23 of the modified example 5 of the present invention.

The flow path closing tool 40 is composed of a nozzle main body mounting hole closing tool 41 and an air flow path closing tool 42 (see FIG. 24). The nozzle body mounting hole closing tool 41 has a hexagonal tip outer peripheral surface, and a male screw is formed on the rear outer peripheral surface thereof. Further, the tip of the air flow path closing tool 42 projects slightly outward in the circumferential direction, and a male screw is formed on the rear outer peripheral surface thereof. Then, the nozzle body is mounted by screwing the male screw formed on the outer periphery of the nozzle body mounting hole closing tool 41 and the female screw formed on the inner circumference of the tip of the nozzle body mounting hole 23 of the monitor 3. The hole closure 41 is attached to the monitor 3. As a result, the flow path of cement milk from the water flow path 9 for cement milk can be closed. Further, the air flow path closing tool 42 monitors by screwing the male screw formed on the outer periphery of the air flow path closing device 42 and the female screw formed on the inner circumference of the air cover mounting hole 43 of the monitor 3. Attached to 3. As a result, the air flow path from the air flow path 10 can be closed.

In this way, by attaching the flow path closing tool 40 to the flow path of the unused cement milk and compressed air, it is possible to select the mounting position of the nozzle body 24 suitable for forming the consolidated body according to the application.

(Modification 6)
The difference between the modified example 6 of the present invention and the first embodiment is that, in the first embodiment, the nozzle body 24 is screwed to the nozzle body 26 and the nozzle body extension 27 which can be coupled to the nozzle body 26. In the modified example 6, the nozzle body 24w of the high-pressure injection nozzle device 1w is composed of a nozzle body 26w and a nozzle body extension 27w that is completely separated from the nozzle body 26w and cannot be combined. I have just made it. Here, FIG. 25A is an enlarged view of the PP portion of FIG. 3 of the modification 6 of the present invention. FIG. 25B is a diagram showing a mounting hole for a nozzle body of a monitor, FIG. 26 is a diagram showing a component of a high-pressure injection nozzle device according to a modification 6 of the present invention, and FIG. 27 is a cross section of the component. It is a figure. Hereinafter, the nozzle body portion 24w will be specifically described.

The nozzle body 26w has a cylindrical shape with a smaller diameter at the front portion and a cylindrical shape with a slightly larger diameter at the rear portion than the front portion. Further, an O-ring mounting recess 47 is formed on the rear end surface of the nozzle body 26w (see FIG. 27B). Further, the nozzle body extension portion 27w has a cylindrical shape with a larger diameter at the front portion and a cylindrical shape with a slightly smaller diameter at the rear portion than the front portion. In the sixth modification, as in the first embodiment, both the nozzle body 26w and the nozzle body extension 27w are molded from a high-strength material such as cemented carbide.

The hollow interior of the nozzle body portion 24w is composed of a rear end inner diameter portion 28w, an intermediate inner diameter portion 29w, and a tip inner diameter portion 30w (see FIG. 27). The intermediate inner diameter portion 29w and the tip inner diameter portion 30w are formed in the nozzle body 26w, and the rear end inner diameter portion 28w is formed in the nozzle body extension portion 27w. Here, in the modified example 6, the length of the rear end inner diameter portion 28w is 9 mm, the length of the intermediate inner diameter portion 29w is 15 mm, and the length L of the tip inner diameter portion 30w is 8 mm, as in the first embodiment. (See Fig. 7). The intermediate inner diameter portion 29w has a tapered surface whose inner peripheral surface is reduced in diameter at a drawing angle β of 12 degrees to 20 degrees (preferably 12 degrees to 15 degrees, more preferably 12 degrees to 13 degrees) in the tip direction. The tip inner diameter portion 30w communicates with the tip of the intermediate inner diameter portion 29w, the inner diameter d of the hollow shape is substantially the same as the diameter of the tip of the intermediate inner diameter portion 29w, and the length L is the intermediate inner diameter. The diameter d of the tip of the tip 29w is 2 to 4 times (preferably 3 to 4 times) the diameter d of the tip, and the diameter d of the tip inner diameter 30w is 2 mm. Further, the rear end inner diameter portion 28w communicates with the rear end of the intermediate inner diameter portion 29w, and the inner diameter of the communicating portion is formed to be substantially the same as the diameter of the rear end of the intermediate inner diameter portion 29w. When the nozzle body portion 24w is attached to the monitor 3, it is in a state of protruding 7 mm into the cement milk combined water flow path 9 (curing material liquid flow path) in the monitor 3. Here, the length of the nozzle body 24w protruding into the cement milk combined water flow path 9 (curing material liquid flow path) in the monitor 3 is the same as in the first embodiment, the length of the cement milk combined water flow path 9 in the monitor 3. It is half (D / 2) of the diameter (D) of (curing material liquid flow path). In the modified example 6, as in the first embodiment, the total length LL (32 mm) of the nozzle body portion 24w is formed to be 16 times the diameter d (7 mm) of the tip of the intermediate inner diameter portion 29w. The total length of the nozzle body 24w may be 15 to 20 times the diameter of the tip of the intermediate inner diameter 29w, and the total length LL of the nozzle body 24w cannot be increased. May be formed so that the total length LL of the nozzle body portion 24w is 10 to 20 times the diameter d of the tip of the intermediate inner diameter portion 29w. Further, the rear end inner diameter portion 28w inside the nozzle body extension portion 27w is formed with a flow path dividing portion 31w that divides the hollow rear end inner diameter portion 28w cross section into a plurality of spaces. Similar to the first embodiment, the flow path dividing portion 31w is formed in a cross shape having a width of 1.5 mm and a length of 5.5 mm. Further, the flow path dividing portion 31w can also be deformed into the shape of the modification example 3.

Next, the method of attaching the nozzle body 24w to the nozzle body mounting hole 23w formed on the side surface of the monitor upper tube 35 will be described, which is different from the mounting method of the nozzle body 24 of the first embodiment. Here, a nozzle body extension fastening convex portion 38 is formed in the nozzle body portion mounting hole 23w formed on the side surface of the monitor upper tube 35 of the modified example 6 (see FIG. 25 (b)).

(1) First, the nozzle body extension portion 27w is inserted into the nozzle body portion mounting hole 23w. As a result, the cylindrical shape formed at the tip of the nozzle body extension portion 27w comes into contact with the nozzle body extension portion fastening convex portion 38, and the nozzle body extension portion 27w is supported by the nozzle body extension portion fastening convex portion 38.
(2) Next, the nozzle body 26w is inserted into the nozzle body mounting hole 23w. As a result, the rear end of the nozzle body 26w comes into contact with the tip end side of the nozzle body extension 27w, but is sealed by the O-ring 46 inserted into the O-ring mounting recess 47 at the rear end of the nozzle body 26w.

(3) Next, the high-pressure injection nozzle device 1 including the nozzle body portion 24w is mounted on the nozzle body in the same procedure as the mounting procedure of the first embodiment, such that the nozzle body support 32 is fitted from the tip direction of the nozzle body 26w. It is mounted in the part mounting hole 23w. Similar to the first embodiment, the nozzle body extension portion 27w attached in this way is attached so as to project to a substantially central portion of the cement milk combined water flow path 9 (curing material liquid flow path) in the monitor 3. As in the first embodiment, the modified example 6 may also protrude to at least about 1/3 of the cross section of the cement milk combined water flow path 9 in the monitor 3, and also in the first embodiment. As described above, when a plurality of nozzle main body mounting holes 23w are formed at positions where the heights of the monitors 3 in the axial direction are different, at least about 1/2 to about 1/2 of the cross section of the cement milk combined water flow path 9 in the monitor 3 is omitted. It may be made to protrude up to 2/3 (preferably about 2/3).

(Modification 7)
The difference between the modified example 7 of the present invention and the first embodiment (including the modified examples 1 to 6) is that in the first embodiment, the rear end inner diameter portion 28 of the nozzle body portion 24 is after the intermediate inner diameter portion 29. In the modified example 7, the rear end inner diameter portion 28 of the nozzle body portion 24 is formed to have substantially the same diameter as the diameter of the rear end of the intermediate inner diameter portion 29 so as to communicate with the end. Communicating with the rear end, the diameter of the communicating portion between the rear end inner diameter portion 28 and the intermediate inner diameter portion 29 is substantially the same as the diameter of the rear end of the intermediate inner diameter portion 29, and the rear end inner diameter portion 28 and the intermediate inner diameter portion 29 The diameter has been increased from the communication portion toward the rear end of the rear end inner diameter portion 28. In this case, the same angle of the intermediate inner diameter portion of 12 degrees to 20 degrees (preferably 12 degrees to 15 degrees, more preferably 12 degrees to 13 degrees) or a larger angle of 13 degrees or more or 18 degrees or more. Then, the diameter may be increased toward the rear end of the rear end inner diameter portion 28.

By increasing the diameter from the communication portion between the rear end inner diameter portion 28 and the intermediate inner diameter portion 29 toward the rear end of the rear end inner diameter portion 28, more cement milk can be laminarized into the nozzle body portion 24. Cement milk can be ejected from the material liquid injection nozzle 21 formed at the tip of the nozzle main body 24 without degrading the cutting ability, and cement milk can be ejected to a longer distance.

(Modification 8)
The modified example 8 of the present invention has a shape in which the above-described modified example 7 is applied to the third embodiment, and the difference between the modified example 8 and the third embodiment is that in the third embodiment, the rear end of the nozzle body portion 24y The inner diameter portion 28y communicates with the rear end of the intermediate inner diameter portion 29y, and the diameter is formed to be substantially the same as the diameter of the rear end of the intermediate inner diameter portion 29y, whereas in the modified example 8, the nozzle body portion 24z The rear end inner diameter portion 28z communicates with the rear end of the intermediate inner diameter portion 29z, and the diameter of the communicating portion between the rear end inner diameter portion 28z and the intermediate inner diameter portion 29z is substantially the same as the diameter of the rear end of the intermediate inner diameter portion 29z, and then. The diameter has been increased from the communication portion between the end inner diameter portion 28z and the intermediate inner diameter portion 29z toward the rear end direction of the rear end inner diameter portion 28z (see FIGS. 28 to 31). In this case, the intermediate inner diameter portion 29z has a similar angle of 12 degrees to 20 degrees (preferably 12 degrees to 13 degrees) or a larger angle of 13 degrees or more or 18 degrees or more, and after the rear end inner diameter portion 28z. The diameter may be increased toward the end. Here, FIG. 28 (a) is an enlarged view of a PP portion of FIG. 3 of the high-pressure injection nozzle device according to the modified example 8 of the present invention, and FIG. 28 (b) is a view showing a nozzle body portion mounting hole of the monitor. 29 is a diagram showing components of the high-pressure injection nozzle device, FIG. 30 is a cross-sectional view of the components, and FIG. 31 is a diagram showing a method of mounting the high-pressure injection nozzle device.

In this way, by increasing the diameter from the communication portion between the rear end inner diameter portion 28z and the intermediate inner diameter portion 29z toward the rear end of the rear end inner diameter portion 28z, more cement milk flows into the nozzle body portion 24z. The laminar cement milk can exert a stronger injection force at the tip portion where the diameter is reduced, and the material liquid injection nozzle 21z formed at the tip of the nozzle body 24z. Cement milk can be sprayed from the nozzle without degrading the cutting ability, and cement milk can be sprayed to a longer distance.

1 High-pressure injection nozzle device 1w High-pressure injection nozzle device 1x High-pressure injection nozzle device 1y High-pressure injection nozzle device 2 Injection rod 3 Monitor 3x Monitor 3y Monitor 4 Tip nozzle 5 Working machine 6 Swivel 7 Cement milk combined water supply path 8 Air supply path +
9 Cement milk combined water flow path 10 Air flow path 11 Water supply source 12 Air supply source 13 Cement milk supply source 14 Water supply hose 15 Air supply hose 16 Cement milk supply hose 17 Injection rod outer pipe 17a Monitor outer pipe 18 Injection Rod inner tube 18a Monitor inner tube 19 Coupling pin insertion hole 20a Coupling pin injection rod recess 20b Coupling pin monitor recess 21 Material liquid injection nozzle 22 Air injection nozzle 23 Nozzle body mounting hole 23a Nozzle body mounting hole 23b Nozzle body mounting hole 23w Nozzle body mounting hole 23x Nozzle body mounting hole 23y Nozzle body mounting hole 24 Nozzle body 24w Nozzle body 24x Nozzle body 24y Nozzle body 25 Air cover 25x Air cover 25y Air cover 26 Nozzle body 26w Nozzle body 26y Nozzle body 27 Nozzle body extension 27w Nozzle body extension 27y Nozzle body extension 27z Nozzle body extension 28 Rear end inner diameter 28w Rear end inner diameter 28x Rear end inner diameter 28y Rear end inner diameter 28z Rear end inner diameter 29 Intermediate inner diameter Part 29w Intermediate inner diameter part 29x Intermediate inner diameter part 29y Intermediate inner diameter part 30 Tip inner diameter part 30w Tip inner diameter part 30x Tip inner diameter part 30y Tip inner diameter part 31 Flow path dividing part 31a Flow path dividing part 31w Flow path dividing part 31x Flow path dividing part 31y Flow path dividing part 31z Flow path dividing part 32 Nozzle body support 32x Nozzle body support 32y Nozzle body support 33 Notch 34 Differential pressure valve 35 Monitor upper tube 36 Coupling pin 37 Injection rod inner tube connection tube 38 Nozzle body Extension fastening convex 38x Nozzle body extension fastening convex 38y Nozzle body extension fastening convex 39 Monitor lower pipe 40 Flow path closure 41 Nozzle body mounting hole closure 42 Air flow path closure 43 Air cover mounting hole 43a Air cover mounting hole 43b Air cover mounting hole 44 Injection rod protrusion 45 Monitor upper pipe protrusion 46 O-ring 46x O-ring 46y O-ring 47 O-ring mounting recess 47x O-ring mounting recess 47y O-ring mounting recess 48x Nozzle body rear member

Claims (2)

A high-pressure injection nozzle device provided on the side surface of a monitor that communicates with the inside of a curing material liquid supply pipe formed in the injection rod in the axial direction and is connected to the tip of the injection rod.
A tip that communicates with the tapered intermediate inner diameter portion formed by reducing the diameter of the inner peripheral surface toward the tip and the tip of the intermediate inner diameter portion, and whose diameter is substantially the same as the diameter of the tip of the intermediate inner diameter portion. A rear end formed by communicating with the inner diameter portion and the rear end of the intermediate inner diameter portion and having a diameter substantially the same as the diameter of the rear end of the intermediate inner diameter portion, or expanding from the substantially same diameter toward the rear end. It has a nozzle body portion having a hollow shape formed of an inner diameter portion.
At least about 1/3 of the cross section of the curing material liquid flow path formed in the axial direction in the monitor is provided so as to project the inner diameter of the rear end of the nozzle body, and a plurality of hollow cross sections are provided. A flow path division part that divides into space is formed,
After the curing material liquid flowing through the inner diameter of the rear end of the nozzle body is laminarized more finely in each space divided by the flow path dividing portion, it has a hollow shape in which the tangible material of the intermediate inner diameter does not exist. Since the diameter is reduced in space and sent toward the tip, the cutting ability of the hardened material liquid ejected from the inner diameter of the tip of the nozzle body is increased, and the hardened material liquid can be injected to a longer distance. High-pressure injection nozzle device. The ground improvement device according to claim 1, wherein the monitor provided with the high-pressure injection nozzle device is provided.

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