JP2023174444A - High-pressure injection nozzle device and foundation improvement device having the same - Google Patents

Abstract

To solve problems of a conventional high-pressure injection nozzle device including the necessity of much manufacturing cost due to the use of an air cover with a plurality of inclined grooves formed on an inner peripheral surface thereof, and the necessity of replacement of the air cover every time the air cover is damaged by an injected and splashed curing liquid (including crushed solid material and foundation).SOLUTION: A high-pressure injection nozzle device can suppress a manufacturing cost and a repair and replacement cost lower as the device has protrusions 50b that are disposed on an inner peripheral surface of an outer peripheral inclined groove member 50 having inclined grooves 50a inclined obliquely in substantially the same direction toward a tip direction on an inner peripheral surface, protrude inward, and are abutted against an outer peripheral surface of a nozzle body part 24. Compressed air can be injected from a compressed air injection port on a tip of an air flow channel between the inner peripheral surface of the outer peripheral inclined groove member 50 and the outer peripheral surface of the nozzle body part 24 in a state where the outer peripheral inclined groove member 50 rotating in circumferential direction of the outer peripheral surface of the nozzle body 24 is hard to fluctuate.SELECTED DRAWING: Figure 21

Description

The present invention relates to a high-pressure injection nozzle device that communicates with the inside of a hardening material liquid supply pipe in an injection rod and is provided on the side of a monitor connected to the tip of the injection rod, and a ground improvement device equipped with the same.

BACKGROUND ART Hitherto, a high-pressure injection nozzle device that communicates with the inside of a hardening material liquid supply pipe in an injection rod and is provided on the side of a monitor connected to the tip of the injection rod, and a ground improvement device equipped with the same have been known.

In this type of high-pressure injection nozzle device 100, a material liquid injection nozzle 121 is provided inside the high-pressure injection nozzle device 100, and an air injection nozzle 122 is formed on the outside thereof (see FIG. 26). The air injection nozzle 122 is formed between the outer circumferential surface of the nozzle body 126 and the inner circumferential surface of the air cover 125, and the inner circumferential surface of the air cover 125 is inclined in substantially the same direction toward the tip. A plurality of inclined grooves 125a having substantially the same shape are formed (see FIG. 27). When the hardening material liquid is injected from the material liquid injection nozzle 121 inside the high pressure injection nozzle device 100 and compressed air is injected at high pressure from the air injection nozzle 122 outside the material liquid injection nozzle 121, the high pressure injection nozzle device A hardening material liquid is injected from the inside of the air cover 100, and compressed air is injected at high speed from the outside (outer periphery) of the air cover 125. rotate. As a result, a swirling flow of compressed air is formed around the jet of hardening material liquid injected from the material liquid injection nozzle 121, and the swirling flow of compressed air covers the jet of hardening material liquid as an air layer film, compressing Compared to the case where there is no air layer film, the cutting ability of the hardening material liquid injected from the inside of the high-pressure injection nozzle device 100 is increased, and the hardening material liquid can be sprayed over a longer distance. (For example, Patent Document 1). Here, FIG. 26 is a longitudinal sectional view of a monitor equipped with a conventional high-pressure injection nozzle device, and FIG. 27 is a diagram showing the components of the same high-pressure injection nozzle device.

Patent No. 6754914

However, the conventional high-pressure injection nozzle device uses an air cover in which a plurality of inclined grooves having the same shape that are inclined in substantially the same direction toward the tip are formed on the inner circumferential surface. When manufacturing an air cover in which an inclined groove is formed, a complicated process is required and the manufacturing cost is high. Furthermore, since the surface of the air cover is exposed on the outer peripheral surface of the high-pressure injection nozzle device, when the hardening material liquid injected from the high-pressure injection nozzle device collides with a solidified object such as a rock, the hardening material bounces off the solidified object. Liquids (including crushed solids and soil) can damage the air cover and require replacement, which increases the cost of manufacturing the air cover each time the air cover is replaced. There was a problem.

The present invention has been made in view of the above-mentioned problems, and it is possible to sufficiently increase the ejection range of the hardening material liquid injected from the high-pressure injection nozzle device, and to reduce the manufacturing cost and repair/replacement cost of the high-pressure injection nozzle device. It is an object of the present invention to provide a high-pressure injection nozzle device and a ground improvement device equipped with the same, which can be inexpensive.

In order to solve the above-mentioned problems and achieve the above-mentioned objects, the present invention relates to a first aspect of the present invention. A high-pressure injection nozzle device provided on a side surface of the monitor connected to the monitor, the intermediate inner diameter portion having a tapered surface formed by reducing the diameter of the inner peripheral surface toward the distal end, and communicating with the distal end of the intermediate inner diameter portion, a tip inner diameter portion having a diameter that is approximately the same as the diameter of the tip of the intermediate inner diameter portion; and a tip inner diameter portion that communicates with the rear end of the intermediate inner diameter portion and has a diameter that is approximately the same as the diameter of the rear end of the intermediate inner diameter portion; A nozzle main body part configured with a hollow hardening material liquid flow path consisting of a rear end inner diameter part formed by expanding from approximately the same diameter toward the rear end, and a nozzle body part that is fitted into the tip part of the nozzle main body part. , the outer circumferential surface is reduced in diameter toward the distal end, and a plurality of inclined grooves are formed on the outer circumferential surface that are inclined in substantially the same direction toward the distal end, and the inner circumferential surface and the outer circumferential surface of the nozzle main body are connected to each other. a hollow outer peripheral inclined groove member with an air flow path formed therebetween; a protrusion provided on the inner peripheral surface of the outer peripheral inclined groove member that protrudes inward and comes into contact with the outer peripheral surface of the nozzle body; an air cover in which a compressed air flow path is formed between the peripheral surface and the outer peripheral surface of the outer peripheral inclined groove member, and a protrusion on the inner peripheral surface of the outer peripheral inclined groove member contacts the outer peripheral surface of the nozzle body. By contacting the outer circumferential surface of the nozzle body, the outer circumferential inclined groove member that rotates in the circumferential direction becomes difficult to move, and the air between the inner circumferential surface of the outer circumferential inclined groove member, the nozzle main body, and the outer circumferential surface Compressed air is injected from the compressed air injection port at the tip of the flow path, and while the outer circumferential inclined groove member is being rotated, compressed air is injected from the tip between the inner circumferential surface of the air cover and the outer circumferential surface of the outer circumferential inclined groove member. As a result, the area around the cement milk jet is covered by the compressed air injected from the compressed air injection port, and the inner peripheral surface of the air cover is covered by the outer peripheral inclined groove member being rotated around the nozzle body at high speed. The compressed air is swirled and injected more strongly from the tip between the outer circumferential groove member and the outer circumferential surface of the outer circumferential inclined groove member.

According to the present invention, a compressed air injection layer is formed from the compressed air injected from the tip between the inner circumferential surface of the outer peripheral inclined groove member and the outer circumferential surface of the nozzle body, and the compressed air injection layer is formed between the inner circumferential surface of the "air cover" and the " The compressed air injected from the tip between the outer peripheral surface and the outer circumferential inclined groove member can be swirled around the hardening material liquid injected from the tip of the nozzle main body via the compressed air injection layer. This makes it difficult for the compressed air injected from the tip between the inner circumferential surface of the air cover and the outer circumferential surface of the outer circumferential inclined groove member to come into direct contact with the hardening material liquid injected from the tip of the nozzle body. The compressed air injected from the tip between the inner circumferential surface of the nozzle and the outer circumferential surface of the outer circumferential inclined groove member can be swirled with a larger swirling force, and the compressed air swirling flow can cause the compressed air injected from the tip of the nozzle body to The hardening material liquid can be more strongly pressed toward the center. Further, an air flow path is formed between the inner circumferential surface of the outer circumferential inclined groove member and the outer circumferential surface of the nozzle main body, and is provided on the inner circumferential surface of the outer circumferential inclined groove member and protrudes inward to the outer circumferential surface of the nozzle main body. Since the projection on the inner circumferential surface of the outer peripheral inclined groove member comes into contact with the outer circumferential surface of the nozzle body, the outer circumferential surface of the nozzle body can be rotated in the circumferential direction. In a state where the outer circumferential inclined groove member is difficult to move, compressed air is injected from the compressed air injection port at the tip of the air flow path between the inner circumferential surface of the outer circumferential inclined groove member, the nozzle body, and the outer circumferential surface, and Compressed air is injected from the tip between the inner circumferential surface of the air cover and the outer circumferential surface of the outer circumferential inclined groove member while the outer circumferential inclined groove member is rotated, so that cement milk is injected by the compressed air injected from the compressed air injection port. The area around the air flow is covered, and the outer circumferential inclined groove member is rotated around the nozzle body at high speed, so that compressed air is released from the tip between the inner circumferential surface of the air cover and the outer circumferential surface of the outer circumferential inclined groove member. It is possible to spray more strongly while being turned. This makes it possible to lengthen the region (potential core region) in which the speed of the hardening material liquid jetted from the tip of the nozzle body does not decrease, and the hardening material liquid can be jetted over a longer distance.

A second aspect of the present invention is the high-pressure injection nozzle device according to the first aspect, in which the inclined groove of the outer circumferential inclined groove member is formed in substantially the same shape on the outer circumferential surface of the outer circumferential inclined groove member. , in the range of 6 to 12.

According to the present invention, the inclined grooves of the outer circumferential inclined groove member are formed in the outer circumferential surface of the outer circumferential inclined groove member in substantially the same shape and are provided in the range of 6 to 12. The compressed air that has flowed along the inclined groove is strongly injected from the tip between the inner circumferential surface of the air cover and the outer circumferential surface of the outer circumferential inclined groove member by a large flow along the inclined groove, and the injected compressed air is Air can be efficiently swirled around the hardening material liquid injected from the tip of the nozzle body. The compressed air swirling around the hardening material liquid efficiently and strongly presses the hardening material liquid injected from the tip of the nozzle body towards the center, and the swirling flow of the compressed air swirling around the hardening material liquid. As the ground around the outer periphery of the swirling flow is pressed and efficiently cut, the thickness of the compressed air layer around the hardening material liquid jet can be made thicker. It is possible to make it difficult for the immediately following hardening material liquid jet flow to come into contact with the surrounding ground. As a result, the region (potential core region) in which the speed of the hardening material liquid jetted from the tip of the nozzle main body does not decrease can be maintained longer, and the hardening material liquid can be jetted over a longer distance.

A third aspect of the present invention is the high-pressure injection nozzle device according to the first aspect, which is provided on the outer circumferential surface of the outer circumferential inclined groove member, protrudes outward, and is attached to the inner circumferential surface of the air cover. The outer circumferential surface to be abutted has a curved outer circumferential surface portion formed in a curved shape, and since the curved outer circumferential surface portion is formed in a curved shape, the outer circumferential inclined groove member rotates in the circumferential direction of the outer circumferential surface of the nozzle body. When rotating, the contact area between the outer circumferential surface of the outer circumferential inclined groove member and the inner circumferential surface of the air cover is reduced, and the resistance force between the outer circumferential surface of the rotating outer circumferential inclined groove member and the inner circumferential surface of the air cover is small. Therefore, the outer circumferential inclined groove member can be rotated at a higher speed in the circumferential direction of the outer circumferential surface of the nozzle body, and the compressed air is swirled from the tip between the inner circumferential surface of the air cover and the outer circumferential surface of the outer circumferential inclined groove member. However, it is characterized by being able to spray more strongly.

According to the present invention, since the curved outer circumferential surface portion is formed in a curved shape, when the outer circumferential inclined groove member rotates in the circumferential direction of the outer circumferential surface of the nozzle body, the outer circumferential surface of the outer circumferential inclined groove member and the air cover The contact area with the inner circumferential surface is reduced, and the resistance force between the outer circumferential surface of the rotating outer circumferential inclined groove member and the inner circumferential surface of the air cover is reduced. The compressed air can be rotated at a higher speed depending on the direction, and the compressed air can be swirled and injected more strongly from the tip between the inner circumferential surface of the air cover and the outer circumferential surface of the outer circumferential inclined groove member.

A fourth aspect of the present invention is the high-pressure injection nozzle device according to the second aspect, in which the inclined groove of the outer circumferential inclined groove member is formed on the outer circumferential surface of the outer circumferential inclined groove member substantially toward the distal end. It is characterized by being inclined obliquely within the range of 13.0 degrees to approximately 56.0 degrees.

According to the present invention, the inclined groove of the outer circumferential inclined groove member is inclined obliquely within the range of about 13.0 degrees to about 56.0 degrees toward the distal end on the outer circumferential surface of the outer circumferential inclined groove member. The hardening material liquid injected from the tip of the nozzle body is efficiently and strongly pushed towards the center by the compressed air swirling around it, and also by the swirling flow of compressed air swirling around the hardening material liquid. Since the ground around the outer periphery of the swirling flow is efficiently cut while being pressed, the thickness of the compressed air layer around the hardening material liquid jet can be made thicker. This can make it difficult for the hardening material liquid jet flow to come into contact with the surrounding ground. This makes it possible to lengthen the region (potential core region) in which the speed of the hardening material liquid jetted from the tip of the nozzle body does not decrease, and the hardening material liquid can be jetted over a longer distance.

According to a fifth aspect of the present invention, there is provided a high-pressure injection nozzle device according to the first aspect, in which a flow passage dividing a hollow cross section into a plurality of spaces is provided in the inner diameter portion of the rear end of the nozzle body. The dividing portion is formed, and the total cross-sectional area of the flow path divided by the flow path dividing portion is 40% to 60% of the cross-sectional area of the hollow cross section of the inner diameter portion of the rear end near the flow path dividing portion. That is.

According to the present invention, since the total cross-sectional area of the channels divided by the channel dividing portion is 40% to 60% of the cross-sectional area of the hollow cross section of the rear end inner diameter portion near the channel dividing portion, the nozzle The hardening material liquid flowing through the inner diameter portion of the rear end of the main body is divided into the respective spaces divided by the flow path dividing portion, and is sent toward the distal end while being compressed with an appropriate compression force. Then, the hardening material liquid sent toward the tip while being compressed increases its velocity in each space divided by the flow path division part, and a turbulent boundary layer is generated on the inner circumferential surface of the intermediate inner diameter part. Thickness can be reduced and finer laminar flow can be achieved. As a result, the hardening material liquid injected from the tip of the nozzle body is jetted over almost the entire surface of the nozzle at approximately the same speed, making it possible to spray the hardening material liquid over a longer distance, and the nozzle body It is possible to increase the cutting ability of the hardening material liquid sprayed from the tip of the blade and destroy the microstructure of the ground.

According to the present invention, since the air flow path is formed between the inner peripheral surface of the outer peripheral inclined groove member and the outer peripheral surface of the nozzle main body, the air flow path is formed between the inner peripheral surface of the outer peripheral inclined groove member and the outer peripheral surface of the nozzle main body. A compressed air injection layer is formed from the compressed air injected from the tip between the inner circumferential surface of the "air cover" and the outer circumferential surface of the "outer circumferential inclined groove member". It is possible to swirl around the hardening material liquid injected from the tip of the nozzle main body via the air injection layer. This makes it difficult for the compressed air injected from the tip between the inner circumferential surface of the air cover and the outer circumferential surface of the outer circumferential inclined groove member to come into direct contact with the hardening material liquid injected from the tip of the nozzle body. The compressed air injected from the tip between the inner circumferential surface of the nozzle and the outer circumferential surface of the outer circumferential inclined groove member can be swirled with a larger swirling force, and the compressed air swirling flow can cause the compressed air injected from the tip of the nozzle body to By being able to press the hardening material liquid more strongly toward the center, it is possible to lengthen the region (potential core region) in which the speed of the hardening material jetted from the tip of the nozzle body does not decrease, and the hardening material liquid can be further It can be sprayed over long distances.

A sixth aspect of the present invention is a ground improvement device including the high-pressure injection nozzle device according to any one of the first to fifth aspects attached to a monitor.

According to the high-pressure injection nozzle device of the present invention, it is possible to sufficiently increase the ejection reach of the hardening material liquid injected from the high-pressure injection nozzle device, and the manufacturing cost and repair/replacement cost of the high-pressure injection nozzle device do not become high. You can do it like this.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the construction situation of the ground improvement device in which the high-pressure injection nozzle device in 1st Embodiment of this invention is installed. It is an external perspective view of a monitor equipped with the same high-pressure injection nozzle device. 3 is a sectional view taken along line AA in FIG. 2. FIG. 4 is a sectional view taken along line BB in FIG. 3. FIG. 1 is a diagram showing a method of assembling a high-pressure injection nozzle device and its peripheral equipment in a first embodiment of the present invention; FIG. (a) It is an enlarged view of the PP section in FIG. 3. (b) It is a figure showing the nozzle main part attachment hole of a monitor. It is a sectional view showing a method of mounting the same high-pressure injection nozzle device. FIG. 1 is a diagram showing components of a high-pressure injection nozzle device in a first embodiment of the present invention. It is a sectional view of the same component. (a) It is a front perspective view of the outer periphery inclined groove member of the high pressure injection nozzle device in 1st Embodiment of this invention. (b) It is a rear perspective view of the outer peripheral inclined groove member of the same high-pressure injection nozzle device. (c) It is a rear view of the outer peripheral inclined groove member of the same high-pressure injection nozzle device. (d) It is a side view of the outer peripheral inclined groove member of the same high-pressure injection nozzle device. (e) It is a front view of the outer peripheral inclined groove member of the same high-pressure injection nozzle device. (f) It is a DD sectional view of FIG. 10(c). It is a figure which shows the cross-sectional diameter of the inclined groove of the outer peripheral inclined groove member of the same high-pressure injection nozzle device. (a) It is a figure which shows the mounting method of the component of the high pressure injection nozzle apparatus in 1st Embodiment of this invention. (b) It is a rear view of the same high-pressure injection nozzle device. (c) It is a side view of the same high-pressure injection nozzle device. (d) It is a front view of the same high-pressure injection nozzle device. 12 is a sectional view taken along line AA to MM in FIG. 11. FIG. (a) It is a front view of the outer periphery inclined groove member of the high pressure injection nozzle device in 1st Embodiment of this invention. (b) is a sectional view taken along line FF in FIG. 14(a). (c) It is a figure which shows the recessed part diameter and the convex part diameter of the inclined groove of the outer peripheral inclined groove member rear end surface of the high pressure injection nozzle device in 1st Embodiment of this invention. (d) It is a figure which shows the recessed part diameter and the convex part diameter of the inclined groove of the outer peripheral inclined groove member front-end|tip surface of the same high-pressure injection nozzle apparatus. (e) It is a side perspective view of the outer peripheral inclined groove member of the same high-pressure injection nozzle device. (f) It is a figure which shows the calculation method of the inclination angle of the outer peripheral inclined groove member of the same high-pressure injection nozzle device. 4 is a sectional view taken along the line CC in FIG. 3. FIG. It is a figure which shows the injection state from the injection nozzle of the same high-pressure injection nozzle device. (a) It is a figure showing the state where the waste mud around the monitor is discharged to the ground. (b) It is a diagram showing a state in which waste mud around the high-pressure injection nozzle device is discharged to the ground. It is a figure which shows the "standard deviation value of the collision load" of the injection water injected from the injection nozzle of the same high-pressure injection nozzle device. It is a figure which shows the "average value of the collision load" of the injection water injected from the injection nozzle of the same high-pressure injection nozzle device. (a) It is an external perspective view of the monitor equipped with the high-pressure injection nozzle device in 2nd Embodiment of this invention. (b) It is a front view of the same high-pressure injection nozzle device. 20(b) is a sectional view taken along line JJ in FIG. 20(b). (a) It is a front view of the outer periphery inclined groove member of the high pressure injection nozzle device in 2nd Embodiment of this invention. (b) It is a KK sectional view of FIG. 22(a). It is a figure which shows the injection state from the injection nozzle of the high pressure injection nozzle apparatus in 2nd Embodiment of this invention. (a) It is a front view of the outer periphery inclined groove member of the high pressure injection nozzle device in modification 1 of the present invention. (b) It is a GG sectional view of FIG. 24(a). (c) It is a figure which shows the recessed part diameter and convex part diameter of the inclined groove of the outer peripheral inclined groove member rear end surface of the high-pressure injection nozzle apparatus in the modification 1 of this invention. (d) It is a figure which shows the recessed part diameter and the convex part diameter of the inclined groove of the outer peripheral inclined groove member front-end|tip surface of the same high-pressure injection nozzle apparatus. (e) It is a side perspective view of the outer peripheral inclined groove member of the same high-pressure injection nozzle device. (f) It is a figure which shows the calculation method of the inclination angle of the outer peripheral inclined groove member of the same high-pressure injection nozzle device. (a) It is a front view of the outer periphery inclined groove member of the high pressure injection nozzle device in modification 2 of the present invention. (b) is a sectional view taken along line HH in FIG. 25(a). (c) It is a figure which shows the recessed part diameter and convex part diameter of the inclined groove of the outer peripheral inclined groove member rear end surface of the high-pressure injection nozzle apparatus in the modification 2 of this invention. (d) It is a figure which shows the recessed part diameter and the convex part diameter of the inclined groove of the outer peripheral inclined groove member front-end|tip surface of the same high-pressure injection nozzle apparatus. (e) It is a side perspective view of the outer peripheral inclined groove member of the same high-pressure injection nozzle device. (f) It is a figure which shows the calculation method of the inclination angle of the outer peripheral inclined groove member of the same high-pressure injection nozzle device. FIG. 2 is a longitudinal cross-sectional view of a monitor equipped with a conventional high-pressure injection nozzle device. It is a figure showing the constituent parts of the same high-pressure injection nozzle device.

(First embodiment)
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A ground improvement device equipped with a high-pressure injection nozzle device according to a first embodiment of the present invention will be described below with reference to the drawings. Here, FIG. 1 is a diagram showing the construction status of a ground improvement device to which a high-pressure injection nozzle device according to a first embodiment of the present invention is installed.

As shown in FIG. 1, a monitor 3 is attached to the tip of the injection rod 2. Water (liquid) supplied through the injection rod 2 and the inside of the monitor 3 is injected from a tip nozzle 4 provided at the tip of the monitor 3, and water (liquid) is injected from a high-pressure injection nozzle device 1A provided on the side of the monitor 3. Cement milk (curing material liquid) and air are injected through the injection rod 2 and monitor 3.

The work machine 5 is a machine that supports the injection rod 2 and moves the injection rod 2 up and down, rotates, and swings it. As a result, the injection rod 2 and the monitor 3 can be moved not only up and down, but also rotated and rocked by the working machine 5.

The swivel 6 is attached to the rear end of the injection rod 2 and supplies water, air, and cement milk respectively supplied from a water supply source 11, an air supply source 12, and a cement milk (curing material liquid) supply source 13. It is connected to the supply hoses 14, 15, and 16, and supplies water, air, and cement milk to the air supply path 8 provided in the injection rod 2 and the cement milk/water supply path 7 (see Fig. (See Figures 1 to 3). Here, FIG. 2 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. 3 is a sectional view taken along line AA in FIG. 2 and 3, the upper side of the injection rod 2 is omitted.

Next, the configurations of the injection rod 2 and the monitor 3 will be specifically explained using FIGS. 2 to 4. Here, FIG. 4 is a sectional view taken along line BB in FIG.

The injection rod 2 is composed of a double pipe, and cement milk or water (liquid) is supplied to an inner cement milk/water supply path 7 inside the injection rod 2, and an outer air supply path 8 inside the injection rod 2. is supplied with air (see Figure 3). In the first embodiment, the cement milk (curing material liquid) supply pipe and the water supply pipe are configured as one supply pipe by using the cement milk water supply channel 7, but the present invention is not limited to this. The (curing material liquid) supply pipe and the water supply pipe may be configured as separate supply pipes. In addition, when configuring the cement milk (curing material liquid) supply pipe and the water supply pipe as separate supply pipes in this way, multiple pipes such as triple pipes that separate the cement milk (hardening material liquid) and water may be used. Alternatively, a perforated tube may be used. Further, in the first embodiment, the inside of the injection rod 2 made of a double pipe is used as the cement milk water supply path 7, and the outside is made of the air supply path 8, but the invention is not limited to this, and the injection rod 2 is made of a double pipe. The inside of the injection rod 2 may be used as an air supply path, and the outside may be used as a water supply path that also serves as cement milk.

Further, 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, the injection rod 2 is composed of an injection rod inner tube 2a (curing material liquid supply tube) with an outer diameter of 33 mm and an inner diameter of 23 mm, and an injection rod outer tube 2b with an outer diameter of 73 mm and a circular cross section with an inner diameter of 61 mm. A double pipe is used (see Figures 2 and 3). A coupling pin insertion port 19 is formed in the lower part of the injection rod outer tube 2b, and a coupling pin injection rod recess with approximately the same diameter as the half outer circumference of the coupling pin 36 is formed on the inner surface of the lower part so as to communicate with the coupling pin insertion port 19. 20a is formed (see FIGS. 2, 3, and 5). Further, the outer diameter of the injection rod inner tube 2a is reduced to 22 mm from slightly below the upper end of the lower part of the injection rod outer tube 2b (the position where the inner diameter is enlarged) where the inner diameter is enlarged. In the first embodiment, the injection rod outer tube 2b with a circular cross section and an outer diameter of about 73 mm is used, but the injection rod outer tube 2b is not limited to this and has a circular cross section with a diameter of about 50 mm to 140 mm (for example, approximately 73 mm). In addition, when an injection rod outer tube with a circular cross section with a diameter of about 50 mm to 140 mm (for example, about 73 mm) is used, the inner diameter of the injection rod inner tube 2a may be 14 mm to 30 mm. Here, the inner diameter of the injection rod inner tube 2a is determined by the flow rate of cement milk flowing inside the injection rod inner tube 2a. Additionally, an injection rod outer tube with a hexagonal cross section may be used. Here, FIG. 5 is a diagram showing a method of assembling the high-pressure injection nozzle device and its peripheral equipment in the first embodiment of the present invention.

The monitor 3 is attached to the tip of the injection rod 2 as described above. Inside the monitor 3, a cement milk water passage 9 is formed in the center in the axial direction and communicates with the cement milk water supply passage 7 of the injection rod 2. Four air passages 10 are formed in the axial direction that communicate with the air supply passage 8 of the rod 2 (see FIGS. 2 to 4). Details of the air flow path 10 will be described later. In this way, water, air, and cement milk respectively supplied from the water supply source 11, the air supply source 12, and the cement milk supply source 13 are supplied from each supply hose 14, 15, 16→swivel 6→each supply channel 7. , 8 → through each flow path 9, 10, and is injected from each nozzle 1, 4, etc. (see FIGS. 1 and 3). Here, the water and cement milk respectively supplied from the water supply source 11 and the cement milk supply source 13 are supplied to the cement milk water supply channel 7 via the swivel 6 from the water and cement milk supply hoses 14 and 16, respectively. be done. In the first embodiment, the cement milk (hardening material liquid) flow path and the water flow path are configured as one flow path by using the cement milk water flow path 9, but the present invention is not limited to this. The fluid flow path and the water flow path may be configured as separate flow paths.

The monitor 3 has a maximum outer diameter of 90 mm, and inside the monitor 3, a cement milk water channel 9 with a diameter of 16 mm is formed in the center, and the upper part has an outer diameter of 26 mm and a monitor inner pipe 3a with an inner diameter of 16 mm. A double tube is used, which is composed of a monitor outer tube 3b having an outer diameter of 90 mm and an inner diameter of 78 mm, and an air flow path 10 is formed between the monitor inner tube 3a and the monitor outer tube 3b. Specifically, the air flow path 10 includes a flow path between the monitor inner tube 3a and the monitor outer tube 3b that communicate with the air supply path 8 of the injection rod 2, and an inside of the monitor 3 that communicates with the flow path. It is composed of four flow channels (see FIGS. 3 and 4). In this way, the air flow path 10 inside the monitor 3 is communicated with the air supply path 8 inside the injection rod 2 by connecting the flow path between the monitor inner tube 3a and the monitor outer tube 3b that constitute the air flow path 10. communicates with the air supply path 8 within the injection rod 2. As described above, the high-pressure injection nozzle device 1A for injecting cement milk and air is provided on the side surface of the monitor 3, and the coupling pin monitor recess 20b having approximately the same diameter as the semi-inner circumference of the coupling pin 36 is provided on the upper side surface. (See Figure 5). The coupling pin monitor recess 20b is fitted with the coupling pin injection rod recess 20a of the injection rod 2, thereby forming a coupling pin insertion hole 19a that communicates with the coupling pin insertion port 19. A coupling pin 36 is inserted. Furthermore, a tip nozzle 4 for spraying water (liquid) is provided at the tip of the monitor 3.

A differential pressure valve 34 is provided at the bottom of the monitor 3 (see FIG. 3). This differential pressure valve 34 is opened by low-pressure water supplied via the cement milk water supply path 7 and the cement milk water flow path 9 in the monitor 3, and is supplied from the tip nozzle 4 through the opened differential pressure valve 34. The supplied low pressure water is injected. Then, the differential pressure valve 34 is closed by the cement milk supplied via the cement milk water supply path 7 and the cement milk water flow path 9 in the monitor 3, and as described later, the material liquid injection nozzle 21 (high pressure injection nozzle Cement milk is injected from the inside of the tip of the device 1A). Specifically, during drilling, low-pressure water is supplied through the cement milk water supply path 7 of the injection rod 2 and the cement milk water flow path 9 in the monitor 3 that communicates with the cement milk water supply path 7. Low-pressure water supplied from the tip nozzle 4 is ejected through the differential pressure valve 34 in the open state. After drilling is completed, cement milk is supplied through the cement milk water supply path 7 of the injection rod 2 and the cement milk water flow path 9 in the monitor 3 that communicates with the cement milk water supply path 7. By closing the differential pressure valve 34, the supplied cement milk is injected from the material liquid injection nozzle 21 (inside the tip of the high-pressure injection nozzle device 1A).

Next, the high-pressure injection nozzle device 1A will be specifically explained using FIGS. 8 to 10. Here, FIG. 8 is a diagram showing the components of the high-pressure injection nozzle device according to the first embodiment of the present invention, FIG. 9 is a sectional view of the components, and FIG. FIG. 10(b) is a front perspective view of the outer periphery inclined groove member of the high pressure injection nozzle device in the embodiment, FIG. 10(c) is a rear perspective view of the outer periphery inclined groove member of the high pressure injection nozzle device, and FIG. 10(d) is a side view of the outer periphery inclined groove member of the high pressure injection nozzle device; FIG. 10(e) is a rear view of the outer periphery inclined groove member of the high pressure injection nozzle device; FIG. 10(f) is a front view of the groove member, and FIG. 10(f) is a sectional view taken along line DD in FIG. 10(c).

The high-pressure injection nozzle device 1A includes a nozzle main body 24, an outer peripheral inclined groove member 32A, and an air cover 25 (see FIGS. 8 and 9).

The nozzle body portion 24 includes a nozzle body 26 and a nozzle body extension portion 27 (see FIG. 8). Specifically, the nozzle body 26 has a generally cylindrical shape with a smaller diameter at the front portion, and a generally 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 section 28, an intermediate inner diameter section 29, and a tip inner diameter section 30 (see FIG. 9). The intermediate inner diameter portion 29 and the tip inner diameter portion 30 are formed within the nozzle body 26, and the rear end inner diameter portion 28 is formed within the nozzle body extension portion 27. In this way, the hollow interior of the nozzle body 24 communicates with the tapered intermediate inner diameter section 29 formed by reducing the diameter of the inner peripheral surface toward the distal end, and the distal end of the intermediate inner diameter section 29. , a tip inner diameter portion 30 having a diameter that is approximately the same as the diameter of the tip of the intermediate inner diameter portion 29; and a tip inner diameter portion 30 that communicates with the rear end of the intermediate inner diameter portion 29 and has a diameter that is approximately the same as the diameter of the rear end of the intermediate inner diameter portion 29; and a rear end inner diameter portion 28 formed of. As a result, the cement milk supplied via the cement milk water supply pipe 7 in the injection rod 2 and the cement milk water flow path 9 in the monitor 3 that communicates with the cement milk water supply path 7 is transferred to the nozzle body extension. The material is fed into the nozzle main body 24 in the order of 27→nozzle main body 26, and is injected from the material liquid injection nozzle 21 as described later (see FIG. 15). Further, a flow path dividing portion 31 is formed in the rear end inner diameter portion 28 within the nozzle main body extension portion 27, which divides the hollow cross section of the rear end inner diameter portion 28 into a plurality of spaces. The outer diameter of the rear end inner diameter portion 28 is reduced by the flow path dividing portion 31, and the flow path dividing portion 31 within the rear end inner diameter portion 28 has an area approximately at the center that is larger than the area at the front end of the rear end inner diameter portion 28. It is formed in a shape that accounts for 2% to 20% of the outer diameter cross-sectional area (the outer diameter cross-sectional area of the reduced diameter portion of the rear end inner diameter portion 28) (see FIG. 9). In the first embodiment, the diameter of the rear end inner diameter portion 28 in the nozzle main body extension portion 27 is approximately the same as the diameter of the rear end of the intermediate inner diameter portion 29, but the diameter is not limited to this. The diameter may be expanded from approximately the same diameter as the diameter of the rear end of 29 toward the rear end. Here, FIG. 15 is a sectional view taken along the line CC in FIG.

The total cross-sectional area (9.45 mm ² ) of the flow paths divided by the flow path dividing portion 31 is equal to It occupies about 40% of the total area (23.7 mm ² ). In the first embodiment, it has been explained that the total cross-sectional area of the flow paths divided by the flow path dividing portion 31 occupies approximately 40% of the forward outer diameter cross-sectional area of the rear end inner diameter portion 28. However, the total cross-sectional area of the flow paths divided by the flow path dividing portion 31 may be 40% to 60% of the forward outer diameter cross-sectional area of the rear end inner diameter portion 28; It may be made to occupy 40% to 60% of the rear outer diameter cross-sectional area of the rear end inner diameter portion 28 instead of the front outer diameter cross sectional area of the inner diameter portion 28, and the rear end inner diameter portion 28 near the flow path dividing portion 31 It may be made to occupy 40% to 60% of the cross-sectional area of the hollow shape.

Further, the nozzle main body 24 is inserted into a nozzle main body mounting hole 23 formed on the side surface of the monitor 3. Two nozzle body attachment holes 23 are formed at equal intervals on the circumference of the monitor 3 at different axial heights. In this way, since a plurality of nozzle body mounting holes 23 are formed at different positions in the axial direction of the monitor 3, it is possible to attach the nozzle body to the nozzle body mounting holes 23 having different heights according to the application. By attaching a plurality of 24, compacts of various shapes can be efficiently created underground in a short time. In the first embodiment, two nozzle body mounting holes 23 are formed at equal intervals on the circumference at different axial heights of the monitor 3; They do not have to be at different positions, and they do not have to be formed at equal intervals on the circumference. Further, the number of nozzle body attachment holes 23 does not have to be two, but may be a plurality of two or more (preferably four or more) such as three, four, six, etc., or one. You can also do this. Here, FIG. 6(a) is an enlarged view of the PP section in FIG. 3, and FIG. 6(b) is a view showing the mounting hole of the nozzle main body of the monitor.

The outer peripheral inclined groove member 32A has a hollow shape, is fitted into the tip of the nozzle body 24, has an outer circumferential surface that reduces in diameter toward the tip, and has an inclined groove on the outer circumferential surface that is inclined diagonally substantially to the left toward the tip. Eight pieces 32a are formed (see FIGS. 8 and 10). As described above, since the inclined groove 32a is formed on the outer peripheral surface of the outer peripheral inclined groove member 32A, a complicated process is not required when manufacturing the inclined groove 32a on the outer peripheral surface of the outer peripheral inclined groove member 32A, and high pressure injection The manufacturing cost of the nozzle device 1A can be kept low. Further, when the cement milk injected from the high-pressure injection nozzle device 1A collides with a solidified object such as a rock, the rebounded cement milk (including crushed solids and ground) collides with the air cover 25, causing the air cover to 25 is damaged and needs to be replaced, but since the outer peripheral inclined groove member 32A in which the inclined groove 32a is formed is a separate member from the air cover 25, it is only necessary to replace the inexpensive air cover 25. Repair and replacement costs for the high-pressure injection nozzle device 1A can be kept lower. In the first embodiment, the outer circumferential inclined groove member 32A has an inclined groove 32a formed on the outer circumferential surface thereof, which is inclined diagonally substantially to the left toward the distal end. However, the present invention is not limited to this. An inclined groove 32a may be formed which is inclined diagonally substantially to the right. Further, in the first embodiment, the outer circumferential inclined groove member 32A has eight inclined grooves 32a formed on the outer circumferential surface of the outer circumferential inclined groove member 32A, which are inclined diagonally substantially to the left toward the distal end. However, the outer circumferential inclined groove member 32A may have a plurality of inclined grooves 32a, such as 6 to 12 (6 to 8 or 8 to 10) inclined substantially to the left toward the distal end, on the outer circumferential surface of the outer circumferential inclined groove member 32A. It may be formed individually.

Further, the outer circumferential inclined groove member 32A is formed in such a shape that the outer circumferential surface is reduced in diameter toward the distal end (see FIGS. 8 to 10), and the cross-sectional diameter becomes smaller toward the distal end (see FIG. 11). Here, FIG. 11 is a diagram showing the cross-sectional diameter of the inclined groove of the outer peripheral inclined groove member of the high-pressure injection nozzle device according to the first embodiment of the present invention. In FIG. 11, the diameter connecting the concave portion (lowest part) and the diameter connecting the convex portion (top portion) of the inclined groove 32a in each cross section of the outer peripheral inclined groove member 32A is shown. Specifically, as shown in the upper part of FIG. 11, the diameter of the recess of the inclined groove 32a on the outer periphery of the outer inclined groove member 32A (the numerical value in the upper part of FIG. ) is ``Φ16.84mm (A cross section)'', ``Φ14.47mm (K cross section)'', ``Φ14.24mm (L cross section)'', ``Φ14.0mm (M cross section)'' towards the tip. The cross-sectional diameter becomes smaller, and as shown in the lower part of FIG. 11, the "diameter of the convex portion of the inclined groove 32a on the outer periphery of the outer circumferential inclined groove member 32A" in each cross section (A cross section to M cross section) of the outer circumferential inclined groove member 32A. Also, the cross-sectional diameter increases toward the tip: "Φ28.0mm (A cross section)"... "Φ22.17mm (K cross section)" "Φ21.58mm (L cross section)" "Φ21.0mm (M cross section)" is getting smaller. In the first embodiment, the diameter of the convex portion at the tip (M cross section) of the outer peripheral inclined groove member 32A is set to Φ21.0 mm, but the present invention is not limited to this, and the amount of compressed air injected from the air injection nozzle 22 may be increased. In this case, a large outer circumferential inclined groove member 32A may be used in which the diameter of the convex portion at the tip of the outer circumferential inclined groove member 32A is within the range of Φ21.0 mm to Φ27.0 mm (preferably Φ21.0 mm to Φ24.0 mm).

The inclined groove 32a of the outer peripheral inclined groove member 32A is spirally inclined from the rear toward the tip (see FIG. 12). Specifically, the concave portion (lowest part) of the inclined groove 32a of the outer circumferential inclined groove member 32A extends from the rear end point P1 (cross section A (see FIGS. 11 and 13(a)) to the tip P2 point (cross section M (see FIG. 11, see FIG. 13(m))) and is formed while being inclined by 32.6 degrees ("twist angle") in the circumferential direction (see FIGS. 14(e) and (f)). In this way, the inclined groove 32a of the outer peripheral inclined groove member 32A is formed to be spirally inclined from the rear end toward the tip, and to be inclined at 32.6 degrees toward the tip. Here, the inclination angle of the inclined groove 32a of the outer peripheral inclined groove member 32A in the diagonal direction toward the distal end is such that the "recess point on the rear end side (point P1)" It is determined by how much of an angle it is inclined towards. Specifically, the inclination angle of the inclined groove 32a of the outer circumferential inclined groove member 32A is "from point P1 (the concave point of the inclined groove 32a at the rear end of the outer circumferential inclined groove member 32A) in a direction parallel to the central axis of the outer circumferential inclined groove member 32A. The length to the tip point P3 (the length from the rear end to the tip of the outer circumferential inclined groove member 32A (18 mm)) and the tip point P3 and P2 point (the length of the inclined groove 32a at the tip of the outer circumferential inclined groove member 32A) 11.5 mm). Here, "the length from point P1 (the concave point of the inclined groove 32a at the rear end of the outer circumferential inclined groove member 32A) to the tip point P3 lowered in a direction parallel to the central axis of the outer circumferential inclined groove member 32A (the outer circumferential inclined groove member 32A The length from the rear end to the tip) is constant, but the lateral length of the line connecting the tip point P3 and the point P2 (the concave point of the inclined groove 32a at the tip of the outer circumferential inclined groove member 32A) is constant. ” varies. In other words, the "horizontal length of the line connecting the tip point P3 and the point P2 (the concave point of the inclined groove 32a at the tip of the outer circumferential inclined groove member 32A)" determines the length of the inclined groove 32a of the outer circumferential inclined groove member 32A. The angle of inclination is determined. Further, in the first embodiment, the inclined groove 32a on the outer circumferential surface of the outer circumferential inclined groove member 32A is inclined at 32.6 degrees toward the distal end direction, but the invention is not limited to this, and the slope is approximately 13.0 degrees to approximately 56.0 degrees. It may be tilted obliquely within the range of 100°. This will be specifically explained in Modification 1, which will be described later. Here, FIG. 12(a) is a diagram showing a method of mounting components of the high-pressure injection nozzle device according to the first embodiment of the present invention, and FIG. 12(b) is a rear view of the same high-pressure injection nozzle device, FIG. 12(c) is a side view of the high-pressure injection nozzle device, FIG. 12(d) is a front view of the same high-pressure injection nozzle device, and FIG. 13 is a cross-sectional view of A to M in FIG. FIG. 14(a) is a front view of the outer peripheral inclined groove member of the high-pressure injection nozzle device according to the first embodiment of the present invention, and FIG. 14(b) is a sectional view taken along line FF in FIG. 14(a). 14(c) is a diagram showing the diameter of the concave portion and the diameter of the convex portion of the inclined groove on the rear end surface of the outer peripheral inclined groove member of the high-pressure injection nozzle device according to the first embodiment of the present invention, and FIG. 14(e) is a side perspective view of the outer periphery inclined groove member of the same high-pressure injection nozzle device; FIG. (f) is a diagram showing a method of calculating the inclination angle of the outer peripheral inclined groove member of the high-pressure injection nozzle device. Here, cross section A in FIG. 11 corresponds to FIG. 13(a), cross section B in FIG. 11 corresponds to FIG. 13(b), cross section C in FIG. 11 corresponds to FIG. 13(c), etc. The K section in FIG. 11 corresponds to FIG. 13(k), the L section in FIG. 11 corresponds to FIG. 13(l), and the M section in FIG. 11 corresponds to FIG. 13(m).

The air cover 25 has a hexagonal outer circumferential surface at the tip, a male screw is formed on the rear outer circumferential surface, and the hollow interior of the air cover 25 has a tapered shape whose diameter decreases toward the tip (FIGS. 8 and 9). reference). Furthermore, the air cover 25 is fitted into the outer circumferential inclined groove member 32A fitted to the tip of the nozzle body 24, and as described later, the inner circumferential surface of the air cover 25 and the outer circumferential surface of the outer circumferential inclined groove member 32A. An air injection nozzle 22 is formed at the tip between the two (see FIG. 15). Thereby, the compressed air supplied via the air supply path 8 in the injection rod 2 and the air flow path 10 in the monitor 3 that communicates with the air supply path 8 is injected from the air injection nozzle 22. Here, the air injection nozzle 22 communicates with the two air flow paths 10.

A material liquid injection nozzle 21 that injects cement milk and an air injection nozzle 22 that injects compressed air are formed at the tip of the high-pressure injection nozzle device 1A (see FIG. 15). Specifically, a liquid material injection nozzle 21 is provided inside the tip of the high-pressure injection nozzle device 1A, and an air injection nozzle 22 is formed on the outside. In this way, when cement milk and compressed air are injected at high pressure from the high-pressure injection nozzle device 1A, cement milk is injected from the inside of the high-pressure injection nozzle device 1A, compressed air is injected from the outside (outer periphery), and the cement The formation of a compressed air vapor coating around the milk jet allows the spray range to be increased compared to the case without the compressed air vapor coating. Specifically, this will be described later.

The liquid material injection nozzle 21 is formed at the tip of the nozzle body 24. The air injection nozzle 22 is formed from the outer peripheral surface of the outer peripheral inclined groove member 32A and the inner peripheral surface of the air cover 25, and communicates with the air flow path 10 in the monitor 3 (see FIG. 6(a)). . In the first embodiment, the air injection nozzle 22 is formed from the outer circumferential surface of the outer circumferential inclined groove member 32A and the inner circumferential surface of the air cover 25. However, the air injection nozzle 22 is not limited to this. It communicates with the flow path 10 and is configured to surround the outer diameter portion of the tip of the nozzle body 24, and has a reduced cross-sectional area from the air flow path 10 in the monitor 3 toward the tip, and injects compressed air at high speed. Any other form of air injection nozzle may be used as long as it is a nozzle.

Next, a method for assembling the injection rod 2, the monitor 3, and the high pressure injection nozzle device 1A will be described using FIGS. 5 and 7.

First, the lower end of the injection rod 2 is inserted into the upper part of the monitor upper tube 35 (see FIG. 5). When inserting the injection rod 2, insert the semicircular injection rod protrusion 2c formed at the lower end of the injection rod outer tube 2b and the semicircular inner monitor upper tube protrusion 3c formed at the upper part of the monitor upper tube 35. The monitor 3 is attached to the injection rod 2 by fitting and aligning the monitor upper tube 35 and the injection rod 2 in the circumferential direction. Then, the coupling pin 36 is inserted into the coupling pin insertion hole 19a formed by the coupling pin injection rod recess 20a at the lower part of the injection rod outer tube 2b and the coupling pin monitor recess 20b at the upper part of the monitor upper tube 35. is connected to the injection rod 2. Specifically, the coupling pin 36 is composed of a spring pin 36a and a spring pin 36b, and the spring pin 36b is first inserted into the coupling pin insertion hole 19a via the coupling pin insertion opening 19 at the bottom of the injection rod 2, and then The spring pin 36a is press-fitted into the hollow part of the spring pin 36b inserted into the coupling pin insertion hole 19a. In this way, by inserting the coupling pin 36 into the coupling pin insertion hole 19a formed by the coupling pin injection rod recess 20a at the lower part of the injection rod outer tube 2b and the coupling pin monitor recess 20b at the upper part of the monitor upper tube 35, A monitor 3 is coupled to the injection rod 2. In the first embodiment, the upper and lower parts of the upper end of the monitor upper tube 35 have been described as integral, but the present invention is not limited to this. The upper and lower parts may be constructed as separate bodies. By configuring them as separate bodies in this way, it becomes easy to form the four air flow paths 10 within the monitor upper tube 35.

Next, a monitor lower tube 39 containing a built-in differential pressure valve 34 is attached to the lower end of the monitor upper tube 35 (see FIGS. 3 and 5). Specifically, the lower monitor tube 39 is attached to the upper monitor tube 35 by screwing together a male screw on the outer periphery of the upper part of the lower monitor tube 39 and a female screw on the inner periphery of the lower end of the upper monitor tube 35 .

Next, the high pressure injection nozzle device 1A is attached to the nozzle body attachment hole 23 formed on the side surface of the monitor 3. Specifically, the high-pressure injection nozzle device 1A is attached to the nozzle body attachment hole 23 of the monitor 3 through the following steps (1) to (3). Hereinafter, the installation procedure of the high pressure injection nozzle device 1A will be explained with reference to FIG. Here, FIG. 7 is a sectional view showing a method of mounting the high-pressure injection nozzle device according to the first embodiment of the present invention.

(1) First, the nozzle body extension part 27 is inserted into the nozzle body attachment hole 23. Thereby, the nozzle body extension portion 27 is fitted into the nozzle body attachment hole 23. The nozzle body extension 27 fitted into the nozzle body attachment hole 23 is attached so as to protrude into the cement milk water flow path 9 (curing material liquid flow path) inside the monitor 3 (see FIG. 6(a)). ). In the first embodiment, the nozzle main body extension 27 was attached to protrude into the cement milk water flow path 9 (curing material liquid flow path) in the monitor 3; It may be attached in a shape that does not protrude into the (curing material liquid channel), or may be attached so as to protrude almost to the center of the cement milk/water channel 9 (curing material liquid channel) of the monitor 3.

(2) Next, the nozzle body 26 is inserted into the nozzle body attachment hole 23. When this nozzle body 26 is inserted into the nozzle body attachment hole 23, the male screw formed on the outer periphery of the rear end of the nozzle body 26 and the female screw formed in the nozzle body attachment hole 23 of the monitor 3 are connected. By screwing together, the nozzle body 26 is attached to the monitor 3.

(3) Next, the outer circumference inclined groove member 32A and the air cover 25 are fitted in order from the tip of the nozzle body 26, and the male screw formed on the outer circumference of the air cover 25 and the air cover mounting hole 43 on the inner circumference of the side surface of the monitor 3 are fitted. The air cover 25 (including the outer peripheral inclined groove member 32A) is attached to the monitor 3 by screwing together the formed female screw.

As described above, since the high-pressure injection nozzle device 1A is detachably attached to the monitor 3, the high-pressure injection nozzle device 1A can be freely replaced according to the soil quality, etc., and the high-pressure injection nozzle device 1A can be replaced by a simple method. Can be attached to monitor 3.

In this way, by providing the rear end inner diameter portion 28 of the nozzle body extension portion 27 to protrude into the cement milk water flow path 9 (curing material liquid flow path) inside the monitor 3, the linear distance inside the nozzle body portion 24 can be reduced. This can be ensured for a sufficiently long time, and the occurrence of turbulent flow of the cement milk flowing inside the nozzle main body 24 can be reduced. As a result, the cutting ability of the cement milk injected from the tip of the nozzle body 24 can be increased, the tissue structure of the ground can be destroyed, and the cement milk can be injected over a long distance. Furthermore, as described above, the total cross-sectional area of the flow paths divided by the flow path dividing portion 31 is the forward outer diameter cross-sectional area of the rear end inner diameter portion 28 (the outer diameter of the reduced diameter portion of the rear end inner diameter portion 28). Since the shape occupies 40% of the cross-sectional area (cross-sectional area), the cement milk flowing through the inner diameter portion 28 at the rear end of the nozzle body 24 is divided into the respective spaces divided by the flow path dividing portion 31, and an appropriate compression force is applied. It is compressed and sent toward the tip. The cement milk sent toward the tip while being compressed is laminarized while increasing its speed in each space divided by the flow path dividing section 31, so that the cement passes through the nozzle body 24. By making the milk a fine laminar flow and increasing the cutting ability of the cement milk injected from the tip of the nozzle body 24, the tissue structure of the ground can be destroyed and the cement milk can be injected over a longer distance. can. Regarding this, the total cross-sectional area of the flow paths divided by the flow path dividing portion 31 is equal to the forward outer diameter cross-sectional area of the rear end inner diameter portion 28 (the outer diameter cross section of the diameter-reduced portion of the rear end inner diameter portion 28). The same applies to cases where the percentage is 40% to 60%.

Further, as described above, the area of the approximately central portion of the flow path dividing portion 31 of the rear end inner diameter portion 28 is the cross-sectional area of the forward outer diameter of the rear end inner diameter portion 28 (the outer diameter of the reduced diameter portion of the rear end inner diameter portion 28). Since the cement milk is formed in a shape that occupies 2% to 20% of the diameter (diameter cross-sectional area), the cement milk flowing through the inner diameter portion 28 at the rear end of the nozzle body 24 is divided into the spaces divided by the flow path dividing portions 31. After being made into a finer laminar flow in the intermediate inner diameter portion 29, the material is reduced in diameter in the hollow space where no tangible objects exist and is sent toward the tip, so that the material liquid is sprayed into the liquid injection nozzle 21 (the tip of the nozzle body portion 24). The cutting ability of the cement milk injected from the nozzle main body 24 is increased, and the cement milk can be injected over a longer distance. 31, and the collided cement milk flows into each of the channels divided by the channel dividing section 31 and flows along the inner peripheral surface of the intermediate inner diameter section 29 whose diameter has been reduced while increasing the velocity. The thickness of the boundary layer due to turbulent flow generated on the inner peripheral surface of the intermediate inner diameter portion 29 can be reduced, and the cement milk passing through the nozzle body portion 24 is made into a finer laminar flow. The thickness of the boundary layer due to turbulence generated on the inner peripheral surface of the portion 29 can be reduced. As a result, the cement milk that is injected from the tip of the nozzle body 24 is injected at substantially the same speed over almost the entire surface of the injection port, so that the cement milk is injected from the injection port of the material liquid injection nozzle 21 at the tip of the nozzle body 24. The area where the velocity of cement milk does not decrease (potential core area) can be maintained for a longer period of time, cement milk can be injected over a longer distance, and the hardening material liquid injected from the tip of the nozzle body can be cut. It can increase the ability and destroy the tissue structure of the ground. Here, the potential core region is a region where the velocity of the cement milk injected from the liquid material injection nozzle 21 does not decrease, and in this potential core region, the time point at which the cement milk is injected from the injection port of the material liquid injection nozzle 21 is The jet pressure is maintained as it is, forming the so-called core of the jet, and the diameter of the cement milk jet flow jetted from the liquid material jet nozzle 21 is reduced.

In this way, the cement milk flowing through the inner diameter portion 28 of the rear end of the nozzle body portion 24 (nozzle body extension portion 27) is divided into the respective spaces divided by the flow path dividing portion 31 and sent toward the tip. Cement milk can be made into a finer laminar flow in each space divided by the path dividing part 31. As a result, the cutting ability of the cement milk injected from the material liquid injection nozzle 21 at the tip of the nozzle body 24 can be increased, the tissue structure of the ground can be destroyed, and the cement milk can be injected over a longer distance. .

Next, referring to FIGS. 1, 16, and 17, a construction procedure using a ground improvement device equipped with a monitor 3 equipped with a high-pressure injection nozzle device 1A according to the first embodiment of the present invention will be briefly described.

First, after determining the position where the injection rod 2 will be excavated, water (liquid) is injected from the tip nozzle 4 of the monitor 3 attached to the tip of the injection rod 2 at that position, and the hole is drilled to a predetermined depth. (See Figure 1). Here, in FIG. 1, water (liquid) is also injected from the high-pressure injection nozzle device 1A, but during ground excavation, water (liquid) is not injected from the high-pressure injection nozzle device 1A, but from the tip nozzle 4 of the monitor 3. It is injected to drill holes in the ground.

After the hole has been 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, respectively, while the injection rod 2 is rotated upward (see FIG. 16). Specifically, the injection rod 2 is rotated clockwise while simultaneously injecting cement milk and compressed air from the injection nozzles (the liquid material injection nozzle 21 and the air injection nozzle 22). In this embodiment, since the same-shaped inclined grooves 32a that are inclined in substantially the same direction toward the distal end are formed on the outer peripheral surface of the outer circumferential inclined groove member 32A, the air injection nozzle 22 (outer circumferential inclined groove member 32A The compressed air injected from the tip between the outer circumferential surface of the air cover 25 and the inner circumferential surface of the air cover 25 swirls around the cement milk injected from the material liquid injection nozzle 21 (the tip of the nozzle body 24). become. As a result, the cutting ability of the cement milk injected from the liquid material injection nozzle 21 (the tip of the nozzle body part 24) is increased, so the tissue structure of the ground is destroyed, and the cement milk can be injected over a longer distance. . Furthermore, as described above, since the inclined groove 32a is provided on the outer circumferential surface of the outer circumferential inclined groove member 32A, the compressed air injected from the air injection nozzle 22 becomes a swirling flow toward the center and flows around the hardening material liquid. A swirling flow of compressed air in the pressing direction is formed. This makes it difficult for the swirling flow of compressed air swirling around the cement milk to be dispersed, and also greatly increases the jet flow of cement milk in the radial direction immediately after the cement milk is jetted from the material liquid jet nozzle 21. This makes it possible to maintain the straightness of the cement milk jet flow and make it difficult for the speed to be decelerated. Therefore, it is possible to maintain the region (potential core region) where the speed of the cement milk jetted from the material liquid jet nozzle 21 does not decrease for a longer period of time. This allows cement milk to be sprayed over longer distances. Here, FIG. 16 is a diagram showing the state of injection from the tip nozzle of the high-pressure injection nozzle device according to the first embodiment of the present invention.

Further, in the high-pressure injection nozzle device 1A, rotational injection → pulling up of the injection rod 2 → rotational injection is repeated until the injection is completed. In this way, when the injection rod 2 is pulled up while being rotated and injected, the "mixture of soil and cement milk" that has accumulated below is mixed with the cement milk that is injected from the material liquid injection nozzle 21 (the tip of the nozzle body 24). Because it is stirred by the swirling flow of compressed air that swirls around it, the mixture of soil and cement milk rises easily, improving the air lift effect, and the stirred mixture of soil and cement milk is efficiently deposited on the ground as sludge. It can be drained well (see Figure 17).
Furthermore, even if cavitation (air bubbles) exists around the outer periphery of the cement milk injected from the material liquid injection nozzle 21, the air injection nozzle 22 (the inner circumferential surface of the air cover 25 and the outer circumference of the outer circumferential inclined groove member 32A) The compressed air injected from the tip (between the surface and the surface) swirls around the cement milk without any gaps, making it difficult for the cement milk to come into contact with the ground, and the cavities that exist around the outer periphery of the cement milk jet flow. Collapse can be prevented (see Figure 16). Thereby, the region (potential core region) in which the velocity of the cement milk injected from the material liquid injection nozzle 21 does not decrease can be maintained longer, and the cement milk can be injected over a longer distance. In other words, the compressed air injected while rotating from the air injection nozzle 22 surrounds the cement milk without any gaps, making it difficult for the cement milk to come into contact with the ground, thereby preventing the collapse of the cavity that occurs around the outer periphery of the cement milk. It can be prevented. Thereby, the region (potential core region) in which the velocity of the cement milk injected from the material liquid injection nozzle 21 does not decrease can be maintained longer, and the cement milk can be injected over a longer distance. Here, FIG. 17(a) is a diagram showing a state in which waste mud around the monitor is discharged to the ground, and FIG. 17(b) is a diagram showing a state in which waste mud around the high-pressure injection nozzle device is discharged to the ground. FIG.

Next, with the injection rod 2 rotated once, the injection rod 2 is pulled up by a predetermined length (for example, 10 cm or less (preferably 5.0 cm (more preferably 2.5 cm)). Then, the injection nozzle Until the injection from (material injection nozzle 21, air injection nozzle 22) is completed, clockwise rotational injection → pulling up injection rod 2 → clockwise rotational injection → pulling up injection rod 2 → clockwise rotational injection → injection rod 2. Pulling up is repeated. In the first embodiment, the injection rod 2 is rotated clockwise, but the invention is not limited to this, and the injection rod 2 may be rotated counterclockwise. In this case, the outer periphery The inclined groove 32a of the inclined groove member 32A is inclined diagonally substantially to the left toward the distal end.

Next, the injection rod 2 is lifted up from the excavation hole by a crane or the like and extracted from the inside of the excavation hole. Through the above construction procedure, a cylindrical solid body is created underground.

Next, regarding the jet flow of the high-pressure jet nozzle device 1A using the outer peripheral inclined groove member 32A (swivel inner C) of this embodiment, using FIGS. The jet flow will be compared with the jet flow of the high-pressure jet nozzle device 100 using a (swivel air cover B) and the high-pressure jet nozzle device using an air cover without inclined grooves (standard air cover A). In this comparative example, "cement milk" is not injected from the material liquid injection nozzle, but "jet water" is injected from the material liquid injection nozzle, and the respective jet streams are compared. Here, "standard air cover A" is "an air cover in which no inclined grooves are formed", "swivel air cover B" is "air cover 125 with inclined grooves 125a formed on the inner peripheral surface", and " The "swivel inner C" is the "outer circumferential inclined groove member 32A in which the inclined groove 32a is formed on the outer circumferential surface." Moreover, FIG. 18 is a diagram showing the "standard deviation value of collision load" of the jet water injected from the liquid material injection nozzle of the high-pressure injection nozzle device, and FIG. FIG. 3 is a diagram showing the "average value of collision load" of jetted water. Here, in FIG. 18, the horizontal axis is "nozzle-target distance (distance between high-pressure injection nozzle device and target)" and the vertical axis is "standard deviation (collision load standard deviation value)". , "the magnitude of the deflection from the target of the jet water jetted from the liquid material jet nozzle of the high-pressure jet nozzle device" is shown for each "predetermined distance interval from the high-pressure jet nozzle device to the target." In addition, in Fig. 19, the horizontal axis is the "nozzle-target distance (distance between the high-pressure injection nozzle device and the target)", the vertical axis is the "average value of collision load", and the "material liquid of the high-pressure injection nozzle device" is the vertical axis. The average value of the collision load at which the jet water jetted from the jet nozzle collides with the target is shown for each "predetermined distance interval from the high-pressure jet nozzle device to the target."

As shown in FIG. 18, at all distances from the high-pressure injection nozzle device to the target ("1600 mm, 1800 mm, 2000 mm, 2200 mm"), high-pressure injection using the outer peripheral inclined groove member 32A (swivel inner C) of this embodiment The jet water jetted from the material jet nozzle 21 of the nozzle device 1A is higher than the jet water jetted from the material jet nozzle of the high-pressure jet nozzle device using the "standard air cover A" and "swivel air cover B". , the "standard deviation value of collision load" is small.

In this way, the water injected from the material liquid injection nozzle 21 of the high-pressure injection nozzle device 1 using the outer circumferential inclined groove member 32A (swivel inner C) of the present embodiment is transferred to the "standard air cover A" and the "swivel air cover A". The standard deviation value of the collision load (movement runout from the target ("vertical reciprocating deflection" and "horizontal reciprocating deflection") The reason why the reciprocating vibration ")) is small is that the outer circumferential inclined groove member 32A (swivel inner C) of the high pressure injection nozzle device 1 of this embodiment has an outer circumferential surface that is reduced in diameter in the distal direction, and Since the inclined grooves 32a are formed to be inclined in substantially the same direction, the compressed air injected from the air injection nozzle 22 is directed toward the center by the inclined grooves 32a provided on the outer peripheral surface of the outer peripheral inclined groove member 32A. A swirling flow of compressed air is formed in a direction that presses around the jetted water, and the compressed air swirling flow swirling around the jetted water becomes difficult to disperse. It is thought that this is because it becomes difficult for the radial direction to increase significantly. As a result, the outer circumferential inclined groove member 32A (swivel inner C) of the high-pressure injection nozzle device 1 of the present embodiment is more effective than the "standard air cover A" and the "swivel air cover B" for material liquid injection of the high-pressure injection nozzle device 1. The deflection of the water ejected from the nozzle 21 from the target ("vertical reciprocating deflection" and "horizontal reciprocating deflection") is reduced.

Further, as shown in FIG. 19, the jet water jetted from the material liquid jet nozzle 21 of the high pressure jet nozzle device 1A using the outer peripheral inclined groove member 32A (swivel inner C) of this embodiment is ” and the water jetted from the material liquid injection nozzle of the high-pressure injection nozzle device using “Swirling Air Cover B”, all distances from the high-pressure injection nozzle device to the target (“1600 mm, 1800 mm, 2000 mm, 2200 mm”) ), the average value of the collision load (impact force on the target) of the jetted water jetted from the liquid material jetting nozzle is large.

In this way, the water injected from the material liquid injection nozzle 21 of the high-pressure injection nozzle device 1 using the outer circumferential inclined groove member 32A (swivel inner C) of the present embodiment is transferred to the "standard air cover A" and the "swivel air cover A". The reason why the impact force on the target of the jet water jetted from the liquid material jet nozzle 21 is larger than that of "Cover B" is that the outer circumferential inclined groove member 32A (swivel inner C) of the high pressure jet nozzle device 1 of this embodiment ), the diameter of the outer circumferential surface is reduced toward the distal end, and an inclined groove 32a is formed which is inclined in substantially the same direction toward the distal end. As a result, the compressed air injected from the air injection nozzle 22 becomes a swirling flow toward the center, forming a compressed air swirling flow that presses around the jetted water, and the compressed air swirling flow swirling around the jetted water. This is thought to be because it becomes difficult to disperse and the jet water jetted from the liquid material jet nozzle 21 becomes difficult to increase significantly in the radial direction. As a result, the outer circumferential inclined groove member 32A (swivel inner C) of the high-pressure injection nozzle device 1 of the present embodiment allows the jet to be injected from the material liquid injection nozzle more easily than the "standard air cover A" and the "swivel air cover B". The average value of the water collision load (impact force on the target) is large, and the impact force on the target of the water jetted from the liquid material injection nozzle is large.

As mentioned above, compared to the "standard air cover A" and the "swivel air cover B", the "swivel inner C" has the ability to reduce the movement of the jet water from the target from the liquid jet nozzle of the high-pressure jet nozzle device. Because the runout ("vertical reciprocating vibration vibration" and "horizontal reciprocating vibration vibration") is small, and the impact force on the target of the water jetted from the material jet nozzle is large, Even when the injected water is cement milk, the displacement of the cement milk injected from the liquid injection nozzle of the high-pressure injection nozzle device from the target is small, and the target of the cement milk injected from the material injection nozzle is small. It can be said that the impact force on the From this, the "swivel inner C" has a region (potential core region) in which the speed of cement milk injected from the liquid injection nozzle does not decrease compared to the "standard air cover A" and the "swivel air cover B". can be maintained for a longer period of time, and cement milk can be sprayed over a longer distance.

(Second embodiment)
Next, a second embodiment of the high-pressure injection nozzle device of the present invention will be described using FIGS. 20 to 23. Here, FIG. 20(a) is an external perspective view of a monitor equipped with a high-pressure injection nozzle device according to a second embodiment of the present invention, and FIG. 20(b) is a front view of the same high-pressure injection nozzle device, 21 is a sectional view taken along the line JJ in FIG. 20(b), FIG. 22(a) is a front view of the outer circumferential inclined groove member of the high-pressure injection nozzle device according to the second embodiment of the present invention, and FIG. ) is a sectional view taken along line KK in FIG. 22(a), and FIG. 23 is a diagram showing the state of injection from the injection nozzle of the high-pressure injection nozzle device according to the second embodiment of the present invention.

The difference between the second embodiment and the first embodiment is that in the first embodiment, the hollow outer peripheral inclined groove member 32A has an inner diameter that is approximately the same as the outer diameter of the nozzle body 26, and when compressed air is injected. , compressed air is injected while the outer circumferential inclined groove member 32A does not rotate in the circumferential direction of the outer circumferential surface of the nozzle body 26, whereas in the second embodiment, the outer circumferential inclined groove member 50 has an inner diameter that corresponds to the nozzle body 26. The difference is that when compressed air is injected, compressed air is injected while rotating the outer circumferential inclined groove member 50 in the circumferential direction of the outer circumferential surface of the nozzle body 26 (see FIG. 20). Specifically, this will be described later. In addition, in the second embodiment, the same reference numerals are used for the same components as in the first embodiment, the same functions and effects are achieved, and the description thereof will be omitted.

The outer circumferential inclined groove member 50 has four protrusions 50b formed on the inner circumferential surface at equal intervals on the circumference, the inner diameter of which is larger than the outer diameter of the tip of the nozzle body 26, and the outer circumferential inclined groove member 50. The outer circumferential surface (the most protruding part) is formed by a curved outer circumferential surface portion 50c whose outer circumferential surface protrudes outward and comes into contact with the inner circumferential surface of the air cover 25 in a curved shape (FIG. 20( b)). Then, when the outer circumferential inclined groove member 50 is inserted from the tip direction of the nozzle body 26, the protrusion 50b on the inner circumferential surface comes into contact with the outer circumferential surface of the nozzle main body 26, and the inner circumferential surface of the outer circumferential inclined groove member 50 and the nozzle main body There is a gap in the circumferential direction between the outer peripheral surface of 26 and the outer circumferential surface of 26. As described above, by providing a gap between the inner circumferential surface of the outer circumferential inclined groove member 50 and the outer circumferential surface of the nozzle body 26, the inclined surface of the inclined groove 50a of the outer circumferential inclined groove member 50 can be used to control the air flow inside the monitor 3. When pressed by the compressed air supplied from the passage 10, the outer peripheral inclined groove member 50 can be rotated in the circumferential direction of the outer peripheral surface of the nozzle body 26. In the present embodiment, four protrusions 50b are formed on the inner circumferential surface of the outer peripheral inclined groove member 50 at equal intervals on the circumference, but the present invention is not limited to this, and three to eight protrusions may be formed. However, they do not need to be formed at equal intervals on the circumference.

Further, since the curved outer circumferential surface portion 50c (curved outer circumferential surface (outer circumferential surface)) of the outer circumferential inclined groove member 50 is formed in a curved shape, the outer circumferential inclined groove member 50 rotates in the circumferential direction of the outer circumferential surface of the nozzle body 26. At this time, the contact area between the curved outer circumferential surface portion 50c of the outer circumferential inclined groove member 50 and the inner circumferential surface of the air cover 25 decreases, and the contact area between the curved outer circumferential surface portion 50c of the outer circumferential inclined groove member 50 and the inner circumferential surface of the air cover 25 which is rotating is reduced. Since the resistance force becomes smaller, the outer peripheral inclined groove member 50 can be rotated at a higher speed in the circumferential direction of the outer peripheral surface of the nozzle body 26, and the compressed air can be jetted more strongly from the air injection nozzle 22 while swirling. I can do it.

Furthermore, an air flow path 49 is formed between the inner peripheral surface of the outer peripheral inclined groove member 50 and the outer peripheral surface of the nozzle body 26, and a compressed air injection port 48 is formed at the tip of the air flow path 49 (see FIG. 21). Since the opening area of the compressed air injection port 48 is smaller than the opening area of the air injection nozzle 22, the compressed air injected from the compressed air injection port 48 is smaller than the compressed air injected from the air injection nozzle 22. Can be sprayed at high speed. In this way, the compressed air supplied from the air flow path 10 in the monitor 3 passes through the air flow path 49 between the inner circumferential surface of the outer peripheral inclined groove member 50 and the outer circumferential surface of the nozzle body 26. The compressed air is injected from the compressed air injection port 48 at the tip of the passage 49 at high speed.

In this way, compressed air is injected at high speed from the compressed air injection port 48 at the tip of the air flow path 49 between the inner circumferential surface of the outer peripheral inclined groove member 50 and the outer circumferential surface of the nozzle body 26, thereby causing material liquid injection. A compressed air injection layer was formed to cover the cement milk injected from the nozzle 21, and a compressed air swirl flow injected from the air injection nozzle 22 was injected from the material liquid injection nozzle 21 via the compressed air injection layer. By swirling around the cement milk, the cement milk injected from the material liquid injection nozzle 21 is more strongly pressed toward the center by the compressed air swirling flow injected from the air injection nozzle 22 via the compressed air injection layer. Therefore, it is possible to make it difficult for the cement milk jet flow immediately after jetting from the liquid material jetting nozzle 21 to come into contact with the surrounding ground (see FIG. 23). Thereby, the region (potential core region) in which the velocity of the cement milk injected from the material liquid injection nozzle 21 does not decrease can be maintained longer, and the cement milk can be injected over a longer distance.

Further, by the protrusion 50b on the inner circumferential surface of the outer circumferential inclined groove member 50 coming into contact with the outer circumferential surface of the nozzle body 26, the outer circumferential inclined groove member 50, which rotates in the circumferential direction of the outer circumferential surface of the nozzle body 26, is moved. This makes it difficult to maintain a uniform thickness of the compressed air injected from the compressed air injection port 48 at the tip of the air flow path 49 between the inner circumferential surface of the outer peripheral inclined groove member 50 and the outer circumferential surface of the nozzle body 26. can. Thereby, the compressed air injected from the compressed air injection port 48 can cover the cement milk jet flow without any gaps, making it more difficult for the cement milk jet flow to come into contact with the surrounding ground. In the second embodiment, the outer circumferential inclined groove member 50 is rotated around the nozzle body 26, but the present invention is not limited to this, and the outer circumferential inclined groove member 50 may be prevented from rotating around the nozzle main body 26. good. In this case as well, the compressed air injected from the compressed air injection port 48 forms a compressed air injection layer that covers the cement milk injected from the material liquid injection nozzle 21, and the compressed air injected from the air injection nozzle 22 The swirl flow swirls around the cement milk injected from the material liquid injection nozzle 21 via the compressed air injection layer, so that the cement milk injected from the material liquid injection nozzle 21 is injected from the air injection nozzle 22. Since the swirling flow of compressed air presses more strongly toward the center via the compressed air injection layer, it is possible to make it difficult for the cement milk injection flow immediately after injection from the material liquid injection nozzle 21 to come into contact with the surrounding ground. Thereby, the region (potential core region) in which the speed of the cement milk injected from the material liquid injection nozzle 21 does not decrease can be maintained longer, and the cement milk can be injected over a longer distance.

As described above, in this embodiment, compressed air is injected from the compressed air injection port 48 at the tip of the air flow path 49, and compressed air is injected from the air injection nozzle 22 while the outer peripheral inclined groove member 50 is rotated. Therefore, the compressed air injected from the compressed air injection port 48 covers the cement milk jet stream without any gaps, and the outer peripheral inclined groove member 50 is rotated around the nozzle body 26 at high speed, so that the air is The compressed air is swirled and injected from the injection nozzle 22 more strongly. As a result, the cement milk injected from the material liquid injection nozzle 21 is strongly pressed toward the center via the compressed air injection layer by the compressed air swirl flow injected from the air injection nozzle 22, so that the cement milk is injected from the material liquid injection nozzle 21. It is possible to maintain a region (potential core region) where the speed of the injected cement milk does not decrease for a longer time, and the cement milk can be injected over a longer distance.

Next, a modification of the high-pressure injection nozzle device of the present invention will be described. Here, the length of the high-pressure injection nozzle device is determined by the diameter of the monitor 3, and the high-pressure injection nozzle device of the present invention is used with a length of 20 mm to 40 mm. An outer peripheral inclined groove member compatible with a high pressure injection nozzle device of 20 mm to 40 mm will be described.

(Modification 1)
First, Modification 1 of the high-pressure injection nozzle device of the present invention will be described using FIG. 24. Here, FIG. 24(a) is a front view of the outer peripheral inclined groove member of the high-pressure injection nozzle device in Modification 1 of the present invention, and FIG. 24(b) is a sectional view taken along line GG in FIG. 24(a). , FIG. 24(c) is a diagram showing the diameter of the concave portion and the diameter of the convex portion of the inclined groove on the rear end surface of the outer circumferential inclined groove member of the high-pressure injection nozzle device in Modification 1 of the present invention, and FIG. 24(e) is a diagram showing the diameter of a concave portion and the diameter of a convex portion of the inclined groove on the tip surface of the inclined outer groove member of the nozzle device; FIG. 24(f) is a diagram showing a method of calculating the inclination angle of the outer peripheral inclined groove member of the same high-pressure injection nozzle device.

The difference between Modified Example 1 and the above embodiment is that in the above embodiment, the outer circumferential inclined groove member 32A has a length of 18 mm, and the recess point of the inclined groove 32a of the outer circumferential inclined groove member 32A is from the rear end P1 point to the tip P2 point. In contrast, in Modification Example 1, the outer peripheral inclined groove of 25 mm in length was inclined at 32.6 degrees (“torsion angle”) in the circumferential direction (see FIGS. In the member 32B, the concave point of the inclined groove 32b of the outer circumferential inclined groove member 32B is formed to be inclined by 13.0 degrees ("torsion angle") in the circumferential direction from the rear end PP1 point toward the distal end PP2 point. The difference is that (see FIG. 24).

That is, when the monitor 3 with a diameter of 140 mm is used, the outer circumferential inclined groove member 32B is parallel to the central axis of the outer circumferential inclined groove member 32B from the concave point (PP1 point) of the inclined groove 32b at the rear end of the outer circumferential inclined groove member 32B. The length to the tip point PP3 (the length from the rear end to the tip of the outer periphery inclined groove member 32B) is 25 mm. The horizontal length of the line connecting the concave points (PP2 points) is 5.7 mm. The inclined groove 32b of the outer circumferential inclined groove member 32B is formed such that the concave point is inclined by 13.0 degrees ("torsion angle") in the circumferential direction from the rear end toward the tip (see FIG. 24). ). That is, the inclined groove 32b of the outer peripheral inclined groove member 32B is formed to be spirally inclined from the rear end toward the tip, and to be inclined by 13.0 degrees toward the tip.

In this way, when using the outer circumferential inclined groove member 32B (length 25 mm), which is longer in length than the outer circumferential inclined groove member 32A (length 18 mm) used in the above embodiment, the outer circumferential inclined groove member 32B, considering the interval between the inclined grooves 32b of the outer circumferential inclined groove member 32B, the inclined groove 32b of the outer circumferential inclined groove member 32B has a concave point that extends in the circumferential direction from the rear end toward the tip. It can be formed while being inclined up to a "twist angle" of 13.0 degrees.

(Modification 2)
Next, a second modification of the high-pressure injection nozzle device of the present invention will be described using FIG. 25. Here, FIG. 25(a) is a front view of the outer circumferential inclined groove member of a high-pressure injection nozzle device according to modification 2 of the present invention, and FIG. 25(b) is a sectional view taken along line HH in FIG. 25(a). , FIG. 25(c) is a diagram showing the diameter of the concave portion and the diameter of the convex portion of the inclined groove on the rear end surface of the outer circumferential inclined groove member of the same high pressure injection nozzle device, and FIG. 25(d) is a diagram showing the diameter of the outer circumferential inclined groove of the same high pressure injection nozzle device. 25(e) is a side perspective view of the outer circumferential inclined groove member of the high-pressure injection nozzle device; FIG. It is a figure which shows the calculation method of the inclination angle of the outer peripheral inclined groove member of a high pressure injection nozzle device.

The difference between Modified Example 2 and the above embodiment is that in the above embodiment, the outer circumferential inclined groove member 32A has a length of 18 mm, and the concave point of the inclined groove 32a of the outer circumferential inclined groove member 32A is from the rear end P1 point to the tip P2 point. In contrast, in Modification Example 2, the outer peripheral inclined groove of 10 mm in length was inclined at 32.6 degrees (“torsion angle”) in the circumferential direction (see FIGS. In the member 32C, the concave point of the inclined groove 32c of the outer circumference inclined groove member 32C is formed to be inclined by 56.0 degrees ("torsion angle") in the circumferential direction from the rear end PPP1 point toward the tip PPP2 point. The difference is that (see FIG. 25).

That is, when the monitor 3 with a diameter of 50 mm to 60 mm is used, the outer circumferential inclined groove member 32C is moved from the recess point (PPP1 point) of the inclined groove 32c at the rear end of the outer circumferential inclined groove member 32C to the central axis of the outer circumferential inclined groove member 32C. The length from the tip point PPP3 (the length from the rear end to the tip of the outer circumferential inclined groove member 32C) lowered in the parallel direction is 10 mm. The horizontal length of the line connecting the concave points (PPP2 points) of 32c is 14.7 mm. The inclined groove 32c of this outer peripheral inclined groove member 32C is formed such that the concave point is inclined by 56.0 degrees ("torsion angle") in the circumferential direction from the rear end toward the tip (see FIG. 25). ). That is, the inclined groove 32c of the outer peripheral inclined groove member 32C is formed to be spirally inclined from the rear end toward the tip, and to be inclined 56.0 degrees toward the tip.

In this way, when using the outer circumferential inclined groove member 32C (length 10 mm) which is shorter in length than the outer circumferential inclined groove member 32A (length 18 mm) used in the above embodiment, the outer circumferential inclined groove member 32C, considering the interval between the inclined grooves 32c of the outer circumferential inclined groove member 32C, the inclined groove 32c of the outer circumferential inclined groove member 32C has a concave point that extends in the circumferential direction from the rear end toward the tip. It can be formed while being inclined up to a "twist angle" of 56.0 degrees.

From the above modifications 1 and 2, the size of the high-pressure injection nozzle device varies with the size of the monitor 3. 32c) from the concave point (PP1, PPP1) to the tip point (PP3, PPP3) lowered in a direction parallel to the central axis of the outer circumferential inclined groove member (32B, 32C)" and "the length from the tip point (PP3, PPP3) and the concave points (PP2, PPP2) of the inclined grooves (32b, 32c) at the tips of the outer circumferential inclined groove members (32B, 32C) change. The inclination angle ("torsion angle") of the inclined grooves (32b, 32c) of the outer circumferential inclined groove members (32B, 32C) varies in the range of approximately 13.0 degrees to approximately 56.0 degrees.

The embodiments disclosed this time should be considered to be illustrative in all respects and not restrictive. Furthermore, the scope of the present invention is indicated by the claims rather than the above description, and it is intended that all changes within the meaning and scope equivalent to the claims are included.

1A High pressure injection nozzle device 1B High pressure injection nozzle device 2 Injection rod 2a Injection rod inner tube 2b Injection rod outer tube 2c Injection rod protrusion 3 Monitor 3a Monitor inner tube 3b Monitor outer tube 3c Monitor upper tube inner protrusion 4 Tip nozzle 5 Working machine 6 Swivel 7 Water supply channel for cement milk 8 Air supply channel 9 Water channel for cement milk 10 Air channel 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 19 Coupling pin insertion hole 19a Coupling pin insertion hole 20a Coupling pin injection rod recess 20b Coupling pin monitor recess 21 Liquid injection nozzle 22 Air injection nozzle 23 Nozzle body attachment hole 24 Nozzle body 25 Air cover 26 Nozzle body 27 Nozzle body extension 28 Rear end inner diameter section 29 Intermediate inner diameter section 30 Tip inner diameter section 31 Channel dividing section 32A Outer circumference inclined groove member 32a Inclined groove 32B Outer circumference inclined groove member 32b Inclined groove 32C Outer circumference inclined groove member 32c Inclined groove 34 Differential pressure valve 35 Monitor upper pipe 36 Connection pin 36a Spring pin 36b Spring pin 39 Monitor lower tube 43 Air cover mounting hole 48 Compressed air injection port 49 Air flow path 50 Peripheral inclined groove member 50a Inclined groove 50b Projection part 50c Curved outer peripheral surface part

Claims (6)

A high-pressure injection nozzle device that communicates with the inside of the hardening material liquid supply pipe formed in the axial direction in the injection rod and is provided on the side of the monitor connected to the tip of the injection rod,
a tapered intermediate inner diameter portion formed by reducing the diameter of the inner peripheral surface toward the distal end; and a distal end that communicates with the tip of the intermediate inner diameter portion and has a diameter that is approximately the same as the diameter of the tip of the intermediate inner diameter portion. a rear end that communicates with the inner diameter portion and the rear end of the intermediate inner diameter portion, and has a diameter that is approximately the same as the diameter of the rear end of the intermediate inner diameter portion, or is formed by expanding from the approximately same diameter toward the rear end; a nozzle body portion configured with a hollow hardening material liquid flow path consisting of an inner diameter portion;
It is fitted into the tip of the nozzle main body, the outer peripheral surface is reduced in diameter toward the tip, and a plurality of inclined grooves are formed on the outer circumferential surface that are inclined in substantially the same direction toward the tip, and an inner groove is formed on the outer circumferential surface. a hollow outer circumferential inclined groove member having an air flow path formed between the circumferential surface and the outer circumferential surface of the nozzle main body;
a protrusion provided on the inner circumferential surface of the outer peripheral inclined groove member, protruding inward and abutting the outer circumferential surface of the nozzle main body;
an air cover in which a compressed air flow path is formed between an inner peripheral surface and an outer peripheral surface of the outer peripheral inclined groove member,
Since the protrusion on the inner circumferential surface of the outer circumferential inclined groove member comes into contact with the outer circumferential surface of the nozzle body, the outer circumferential inclined groove member that rotates in the circumferential direction of the outer circumferential surface of the nozzle body becomes difficult to move. In this state, compressed air is injected from the compressed air injection port at the tip of the air flow path between the inner circumferential surface of the outer circumferential inclined groove member, the nozzle main body, and the outer circumferential surface, and the outer circumferential inclined groove member is rotated. At the same time, compressed air is injected from the tip between the inner circumferential surface of the air cover and the outer circumferential surface of the outer circumferential inclined groove member, so that the surroundings of the cement milk jet stream are By rotating the outer circumferential inclined groove member around the nozzle body at high speed, compressed air is released from the tip between the inner circumferential surface of the air cover and the outer circumferential surface of the outer circumferential inclined groove member. A high-pressure injection nozzle device that is characterized by being able to spray more strongly while being rotated. The high pressure according to claim 1, wherein the inclined grooves of the outer circumferential inclined groove member are formed in substantially the same shape on the outer circumferential surface of the outer circumferential inclined groove member, and are provided within a range of 6 to 12. Injection nozzle device. a curved outer circumferential surface portion provided on the outer circumferential surface of the outer circumferential inclined groove member, the outer circumferential surface of which protrudes outward and comes into contact with the inner circumferential surface of the air cover is formed in a curved shape;
Since the curved outer circumferential surface portion is formed in a curved shape, when the outer circumferential inclined groove member rotates in the circumferential direction of the outer circumferential surface of the nozzle body, the outer circumferential surface of the outer circumferential inclined groove member and the inner surface of the air cover Since the contact area with the peripheral surface is reduced and the resistance force between the rotating outer peripheral surface of the outer peripheral inclined groove member and the inner peripheral surface of the air cover is reduced, the outer peripheral inclined groove member is connected to the outer peripheral surface of the nozzle body. The surface can be rotated at a higher speed in the circumferential direction, and compressed air can be swirled and injected more strongly from the tip between the inner peripheral surface of the air cover and the outer peripheral surface of the outer peripheral inclined groove member. The high pressure injection nozzle device according to claim 2. The inclined groove of the outer circumferential inclined groove member is characterized in that the inclined groove of the outer circumferential inclined groove member is inclined obliquely within the range of approximately 13.0 degrees to approximately 56.0 degrees toward the distal end on the outer peripheral surface of the outer peripheral inclined groove member. The high pressure injection nozzle device according to claim 2. A flow path dividing portion that divides the hollow cross section into a plurality of spaces is formed in the inner diameter portion of the rear end of the nozzle body,
The total cross-sectional area of the channels divided by the channel dividing portion is 40% to 60% of the cross-sectional area of the hollow cross section of the inner diameter portion of the rear end near the channel dividing portion. The high pressure injection nozzle device according to claim 1. A ground improvement device comprising the high pressure injection nozzle device according to any one of claims 1 to 5, which is attached to the monitor.

Images