JP2020059985A - Chemical injection device - Google Patents

Abstract

To provide a chemical injection device capable of injecting chemical in a precise point and preventing a chemical hose and an air hose from buckling in soil improvement using a packer.SOLUTION: A chemical injection device is provided with: a head 3; an upper packer part 9 connected on a lower side of the head; a nozzle part 13 comprising a chemical discharge port 14 connected on a lower side of the upper packer; a chemical delivery passage 6 provided with a lower packer part 18 connected on a lower side of the nozzle part to deliver chemical to the chemical discharge port 14; a packer 2 provided with a pressure fluid delivery passage 7 delivering a pressure medium to inner peripheral sides of the upper packer part and a lower packer part; and a chemical supply hose 21 connected on an upper side of the head and supplying chemical in the chemical delivery passage. An air discharge tube 27, passing through from an upper end of the chemical supply hose to a lower end of the packer along a longitudinal direction, whose upper end is projected from the upper end of the chemical supply hose and whose lower end is projected downward from the lower end of the packer, is housed inside.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a chemical liquid injector used for permeating a chemical liquid such as cement milk into the ground through a sleeve pipe inserted into a boring hole formed in the ground, and more specifically, in a sleeve pipe. The present invention relates to a chemical liquid injection device that forms a closed space and discharges a chemical liquid into the closed space for soil improvement to prevent high pressure below the closed space.

  As is well known, when constructing a dam or building a huge structure, it is necessary to improve and strengthen the ground. BACKGROUND ART While releasing a chemical liquid such as cement milk into a sleeve pipe, the chemical liquid is pressed into the ground through cracks or the like on the side wall of a boring hole to penetrate into the ground to strengthen the ground.

  At this time, conventionally, as a device that seals a specific space in the borehole or the sleeve pipe inserted therein to form a closed space and injects the liquid drug into the closed space, a liquid medicine injection device called a packer is known. It is used.

  That is, in this packer, the inflatable portion which expands to the outer peripheral side by receiving the fluid pressure toward the outer peripheral side and restores the original shape when the pressure is released has an upper portion and a lower portion which are spaced apart in the longitudinal direction. It is provided at a location, and a chemical solution discharge port is provided between the expanded parts.

  And when performing ground improvement using this packer, insert the packer into the sleeve pipe inserted in the boring hole and lower it to a predetermined depth, and in that state expand the inflating section with a pressure fluid such as air. As a result, the space between the expanded parts in the sleeve pipe is sealed to form a closed space. Then, in this state, the chemical liquid is discharged from the chemical liquid discharge port into the sleeve pipe at a high pressure to fill the closed space with the chemical liquid, and thereafter, the chemical liquid is injected at a higher pressure. Then, the chemical solution can be injected and penetrated into the ground through the injection hole formed in the sleeve pipe, whereby the ground can be improved.

  Then, after the injection of the chemical solution into the ground is completed, the air is released to release the expansion of the inflatable part, the packer is raised by a certain distance, and at that position again, the ground is ground by the same method as above. Inject a chemical liquid such as cement milk into. As a result, it becomes possible to perform ground improvement even on soft ground.

  By the way, as described above, in the case of injecting the chemical solution into the ground using the packer, after forming the closed space by expanding the inflatable portion in the sleeve pipe, the chemical solution is filled in the closed space, After that, further injection of the chemical solution is performed by releasing the chemical solution from the circular hole formed in the sleeve pipe and the check valve, but it is necessary to inject the chemical solution at a high pressure in order to penetrate the underground. Therefore, when releasing the liquid medicine, the liquid medicine may leak from the inflating portion arranged at the lower part of the packer to the lower side of the closed space.

  Then, the pressure gradually rises below the closed space in the sleeve pipe, and as a result, the packer is pushed up due to the influence of this pressure, making it difficult to inject the chemical liquid to the correct location. The problem occurs.

  Further, as described above, after the injection of the chemical liquid is completed, the expansion of the expansion part is released to raise the position of the packer by a certain distance, and then the chemical liquid is injected again at a predetermined position, but the expansion of the lower part is performed. When the pressure on the lower side of the section is high, when the expansion of the expansion section is released, at the same time, the packer may be pushed by the pressure and suddenly rise. And in this case, the chemical liquid supply hose that supplies air and chemical liquid to the packer and the air hose that supplies pressure fluid such as air for expanding the expansion section are buckled and cannot be reused. There is a problem that it will end up.

  In this regard, in the past, there has been proposed a packer that is provided with a pressure adjusting tube inside and that enables the pressure below the closed space to be reduced by this pressure adjusting tube. Since the upper end of the tube is fixed near the upper end of the packer and high pressure air is discharged into the sleeve pipe, the pressure inside the sleeve pipe cannot be lowered, and the upper expansion part There is a possibility that a high pressure will be applied to the upper part of the and the packer may be pushed down.

Utility model registration No. 3065152 JP, 2009-2044, A JP, 2009-2043, A JP 2006-28943 A

  Therefore, in the ground improvement using the packer, the present invention stabilizes the position of the packer by suppressing the rise of the pressure in the sleeve pipe, and enables the chemical solution to be injected into an accurate location, and the chemical solution supply hose. It is an object of the present invention to provide a chemical injection device capable of preventing buckling of an air hose or an air hose.

The chemical injection device of the present invention is
Head and
An upper packer unit that is connected to the lower side of the head and that has an expanding portion that expands to the outer peripheral side by receiving fluid pressure toward the outer peripheral side and restores the original shape when the pressure is released,
A nozzle part, which is connected to the lower side of the upper packer and has a chemical solution discharge port for discharging the chemical solution,
A lower packer unit connected to the lower side of the nozzle unit and having an expanding portion that expands to the outer peripheral side by receiving fluid pressure toward the outer peripheral side and restores the original shape when the pressure is released. With
The upper end has an opening in the head, and the lower end has a chemical liquid transport path leading to the chemical liquid discharge port,
The upper end has an opening in the head, the lower end reaches the inner peripheral side of the inflatable part of the lower packer part, and the pressure communicated to the inner peripheral side of the inflatable part of the upper packer part and the inner peripheral side of the inflatable part of the lower packer part. A packer including a fluid transfer path,
A chemical liquid injection device comprising: a chemical liquid supply hose that is connected to the upper side of the head;
An air discharge tube that penetrates from the upper end of the chemical solution supply hose to the lower end of the packer along the longitudinal direction, the upper end projects upward from the upper end of the chemical solution supply hose, and the lower end projects downward from the lower end of the packer inside. It is characterized by having been housed.

  In the chemical injection device of the present invention, the upper packer part having the expansion part that expands to the outer peripheral side by receiving the fluid pressure toward the outer peripheral side and restores the original shape when the pressure is released is connected to the lower side of the head. The lower part of the upper packer is connected to a nozzle section having a chemical solution discharge port for discharging the chemical solution, and the lower side of the nozzle section is exposed to the fluid pressure toward the outer circumferential side to the outer circumferential side. The lower packer part, which has an inflating part that expands and restores its original shape when the pressure is released, is connected, and the upper end has an opening in the head and the lower end is the chemical liquid transfer path leading to the chemical liquid discharge port, and the upper end. Has an opening in the head, and the lower end reaches the inner peripheral side of the inflating part of the lower packer part, and also communicates with the inner peripheral side of the inflating part of the upper packer part and the inner peripheral side of the inflating part of the lower packer part. And a packer equipped with In a liquid medicine injection device equipped with a liquid medicine supply hose connected to the upper side of the liquid medicine supply passage for supplying the liquid medicine to the liquid medicine conveying path, the liquid medicine supply hose extends from the upper end of the liquid medicine supply hose to the lower end of the packer along the longitudinal direction, and the upper end supplies the liquid medicine An air discharge tube that projects upward from the upper end of the hose and projects downward from the lower end of the packer is housed inside.

  Therefore, the high-pressure air below the closed space can be discharged by the air discharge tube, so that the packer is pushed up by the high-pressure air in the lower expansion part, or the expansion of the expansion part is released. It is possible to prevent the packer from suddenly rising and buckling the air hose or the chemical liquid hose during the operation.

  Further, in the present invention, the air discharge tube is projected upward from the upper end of the chemical liquid supply hose for supplying the chemical liquid to the packer, whereby high pressure air below the closed space is discharged to the outside of the sleeve pipe. Therefore, it is possible to prevent the packer from being pushed down due to the influence of high-pressure air, and it is possible to stabilize the position of the packer and inject the chemical liquid to an accurate location.

It is a figure for explaining the packer in the example of the medical fluid pouring device of the present invention, and shows a part of structure along the longitudinal direction. It is a figure for explaining the packer in the example of the medical fluid pouring device of the present invention, and shows a part of structure along the longitudinal direction. It is a figure for demonstrating the chemical | medical solution supply hose in the Example of the chemical | medical solution injection apparatus of this invention.

  The chemical liquid injector of the present invention is used for supplying a chemical liquid to a packer, which is connected to an upper part of the packer and a packer for injecting and penetrating the chemical liquid into the ground by releasing the chemical liquid into the sleeve pipe. It is composed of a chemical supply hose.

  The packer has a head, and the upper packer unit is connected to the lower side of the head. The upper packer part has an expanding part that expands to the outer peripheral side by receiving the fluid pressure toward the outer peripheral side and restores the original shape when the pressure is released.

  Further, on the lower side of the upper packer, a nozzle section having a chemical solution discharge port for discharging a chemical solution is connected, and on the lower side of the nozzle section, a lower packer section is connected, and this lower packer section is Similar to the above-mentioned upper packer part, it has an expansion part that expands to the outer peripheral side by receiving fluid pressure toward the outer peripheral side and restores the original shape when the pressure is released.

  Further, inside the packer, a chemical liquid conveying path for conveying the chemical liquid to the chemical liquid discharge port of the nozzle portion, and a pressure fluid for supplying the pressure fluid to the inner peripheral side of the expansion portions of the upper packer portion and the lower packer portion. A transport path is provided.

  The upper end of the chemical liquid transport path has an opening in the head, and the lower end communicates with the chemical liquid discharge port of the nozzle portion. In addition, the pressure fluid transport path has an opening at the upper end at the head, and a lower end at the inner peripheral side of the inflated portion of the lower packer section, and further at the inner peripheral side of the inflated section of the upper packer section and the lower packer. It communicates with the inner peripheral side of the inflated portion of the section.

  Further, the chemical liquid injector of the present invention has an air discharge tube, and this air discharge tube penetrates from the upper end of the chemical liquid supply hose to the lower end of the packer in the longitudinal direction while penetrating in the chemical liquid injector. The upper end projects upward from the upper end of the chemical liquid supply hose, and the lower end projects downward from the lower end of the packer.

  Here, the head includes a head main body having a chemical liquid transfer path having an opening at the end of the head, and a mantle connected to the lower part of the head main body and having a chemical liquid transfer path continuous to the chemical liquid transfer path of the head main body. When connecting the upper packer section to the lower side of the head, the mantle penetrates through the upper packer section, and the chemical solution transfer path of the mantle is connected to the nozzle section in a form that leads to the chemical solution discharge port. By doing so, this makes it possible to provide the chemical liquid transport path by connecting the upper packer portion to the lower side of the head.

  Further, the chemical liquid supply hose has a connecting portion connected to the head and a receiving portion having a receiving opening for receiving the chemical liquid supplied from the chemical liquid pump, and the receiving opening may be formed on the side of the receiving portion. As a result, the head can be easily connected to the head, and the upper end of the air discharge tube can be easily protruded upward from the upper end of the chemical solution supply hose.

  Further, the air discharge tube penetrates the chemical liquid supply hose along the longitudinal direction while projecting the upper end upward from the upper end of the chemical liquid supply hose, and penetrates the chemical liquid transfer passage in the packer, and further, the pressure fluid transfer The lower end may be projected downward from the lower end of the packer through the passage so that the high pressure on the lower side of the lower packer portion can be released to the outside of the sleeve pipe.

  Explaining an embodiment of the liquid medicine injection device of the present invention, the liquid medicine injection device of the present embodiment forms a closed space in a sleeve pipe inserted into a boring hole formed in the ground, and the liquid medicine in the closed space. By discharging, the packer for injecting the chemical solution into the ground and permeating it while performing ground improvement, and the chemical solution supply hose connected to the upper part of this packer and used for supplying the chemical solution to the packer. It is configured.

  First, the packer in the present embodiment will be described with reference to the drawings. FIGS. 1 and 2 are partial cross-sectional views showing the structure of the packer in the present embodiment. 1 shows the upper part and FIG. 2 shows the lower part. In the figure, 2 is a packer. Further, reference numeral 22 in the drawing denotes a bushing for connecting the chemical solution supply hose to the upper end of the packer.

  Further, in the packer 2 of the present embodiment, the upper packer portion is connected to the lower side of the head, and the nozzle portion provided with the chemical liquid discharge port for discharging the chemical liquid is connected to the lower side of the upper packer. An intermediate hose portion is connected to the lower side of the nozzle portion, and a lower packer portion is connected to the lower side of the intermediate hose portion. Each of the upper packer portion and the lower packer has an expansion portion that expands to the outer peripheral side by receiving a fluid pressure toward the outer peripheral side and restores the original shape when the pressure is released. In addition, the packer 2 in the present embodiment is configured to supply a pressure fluid to the inner peripheral side of the chemical liquid transport path for transporting the chemical liquid to the chemical liquid discharge port of the nozzle portion and the inflating portions of the upper packer portion and the lower packer portion. A pressure fluid transport path is provided.

  That is, in the drawing, 3 is a head, and the chemical liquid supply hose 21 is connected to the upper part of the head 3 via a bushing 22. In this embodiment, the head 3 has a head body 4 and a mantle 5 connected to the lower side of the head body 4.

  That is, in the drawing, reference numeral 4 denotes a head main body, and in the present embodiment, the head main body 4 has a deformed columnar shape, and a chemical liquid transport passage 6 is formed therein, and the chemical liquid transport passage 6 has an upper end. Is opened at the upper end of the head body 4, and the lower end is opened at the lower end of the head body 4.

  Next, in the figure, reference numeral 7 is a pressure fluid transport path. That is, in the present embodiment, the head body 4 has a constricted portion 8 formed in an intermediate portion thereof, and the pressure fluid transport path 7 has an upper end opened at the constricted portion 8 and a lower end opened at the lower end of the head body 4. In this way, it is formed inside the head body 4 in a system different from that of the chemical liquid transport path 6.

  Next, in the figure, 5 is a mantle. That is, as described above, the mantle 5 is connected to the lower side of the head body 4 in this embodiment. Further, in this embodiment, the mantle 5 has a round bar-shaped outer shape.

  Further, a chemical liquid transport passage 6 is formed inside the mantle 5, and the chemical liquid transport passage 6 formed inside the mantle 5 communicates with the chemical liquid transport passage 6 formed in the head body 4. On the other hand, the outer diameter of the mantle 5 is smaller than the outer diameter of the head body 4, and the opening on the lower end side of the head body 4 in the pressure fluid transfer path 7 formed in the head body 4 is exposed to the outer peripheral side of the mantle 5. When a pressure medium such as air is supplied from the upper end opening of the pressure fluid transport passage 7 formed in the head body 4, this pressure medium is discharged to the outer circumference of the mantle 5.

  Next, in the figure, 9 is an upper packer part. That is, in this embodiment, the upper packer portion 9 is connected to the lower side of the head 3. The upper packer unit 9 has a cylindrical shape, and the mantle 5 is arranged to be inserted inside the upper packer unit 9 while having a space between the mantle 5 and the inner wall of the upper packer unit 9. An upper packer unit 9 is connected to the lower side of the head 3.

  Here, the upper packer portion 9 will be described. In the present embodiment, the upper packer 9 has a pair of substantially cylindrical metal supporting members 10, and the supporting member 10 has a substantially cylindrical expanding portion. They are connected at 11. That is, both ends of the inflatable part 11 are circumferentially provided on the opposite end sides of the supporting member 10, so that the inflatable part 11 connects the pair of supporting members 10 with each other. The packer unit 9 is configured.

  Further, the expansion part 11 is made of rubber with a steel wire built in, and expands to the outer peripheral side by receiving fluid pressure from the inner peripheral side, and can be restored to the original shape by releasing the pressure. I am trying. In the figure, reference numeral 12 is a fixing metal fitting for fixing both ends of the inflating portion 11 in the longitudinal direction to the supporting member 10.

  Further, the inner diameter of the support member 10 is larger than the outer diameter of the mantle 5, so that, as described above, a space is formed between the outer circumference of the mantle 5 and the inner wall of the upper packer unit 9. Is formed, and this space is used as the pressure fluid transfer path 7. That is, the pressure fluid transport passage 7 communicates with the opening on the lower end side of the pressure fluid transport passage 7 formed in the head body 4, and further communicates with the inner peripheral side of the inflating portion 11 via the head body 4. By supplying a pressure medium such as air to the expansion section 11, the expansion section 11 can receive fluid pressure from the inner peripheral side toward the outer peripheral side and expand to the outer peripheral side.

  Next, in the figure, 13 is a nozzle part. That is, in the present embodiment, the packer 2 has a metallic nozzle portion 13 connected to the lower side of the upper packer portion 9, and the chemical liquid transport path 6 is formed inside the nozzle portion 13.

  The chemical liquid transport path 6 formed in the nozzle portion 13 is open at the upper end and the side surface of the nozzle portion 13, and the side surface opening serves as the chemical liquid discharge port 14.

  Further, the upper end portion of the nozzle portion 13 is connected to the lower end portion of the mantle 5 on the inner peripheral side of the upper packer portion 9, and the chemical liquid transport passage 6 formed in the mantle and the chemical liquid transport passage 6 formed in the nozzle portion 13 communicate with each other. ing. Then, the chemical liquid transport passage 6 formed in the head body 4, the chemical liquid transport passage 6 formed in the mantle 5, and the chemical liquid transport passage 6 formed in the nozzle portion 13 constitute the chemical liquid transport passage 6 of the packer 2 as a whole. The packer 2 of this embodiment has an upper end having an opening in the head 3 and a lower end having a chemical liquid transport path 6 communicating with the chemical liquid discharge port 14. Therefore, by supplying the chemical liquid from the opening on the head side, the chemical liquid can be discharged from the chemical liquid discharge port 14 into the sleeve pipe outside the packer 2.

  Further, in the nozzle portion 13, a pressure medium conveying passage 7 is formed in a system different from the chemical liquid conveying passage 6, and the pressure medium conveying passage 7 has openings at the upper end and the lower end of the nozzle portion 13. The upper end opening communicates with the pressure medium transport passage 7 on the inner peripheral side of the upper packer portion 9.

  Next, in the figure, 15 is an intermediate hose portion. That is, as described above, the intermediate hose portion 15 is connected to the lower side of the nozzle portion 13. The intermediate hose portion 15 includes a pair of cylindrical metal hose support members 16 and a rubber hose. It is configured to communicate with the main body 17. That is, the upper side of the hose support member 16 is connected to the nozzle portion 13, and the hose body 17 has both side portions thereof circumferentially provided on opposite sides of the pair of hose support members 16. The hose body 17 connects the pair of hose support members 16 to form the intermediate hose portion 15 connected to the nozzle portion 13.

  Further, the intermediate hose portion 15 has a hollow cylindrical shape, and the hollow portion is a pressure medium transport passage 7 communicating with the pressure medium transport passage 7 formed in the nozzle portion 13. Further, both end portions of the hose body 17 facing in the longitudinal direction are fixed to the hose support member 16 by fixing fittings 12. It should be noted that the intermediate hose portion 15 functions to insert the packer 2 sufficiently corresponding to the curved portion when there is a locally curved portion in the boring hole or the like, but it is not always necessary.

  Next, in the figure, reference numeral 18 is a lower packer portion. That is, in this embodiment, the lower packer portion 18 is connected to the lower side of the intermediate hose portion 15. The lower packer portion 18 has a pair of substantially cylindrical metal support members 10 as with the upper packer portion 9 described above, and the support members 10 are connected by a substantially cylindrical expansion portion 11. Has been done. That is, both ends of the inflatable part 11 are circumferentially provided on the opposite end sides of the supporting member 10, so that the inflatable part 11 connects the pair of supporting members 10 with each other. The packer unit 18 is configured.

  Further, the expansion part 11 is made of rubber containing a steel wire like the above-mentioned upper packer part 9 and expands to the outer peripheral side by receiving fluid pressure from the inner peripheral side, and the pressure is released. By doing so, the original shape can be restored. In the figure, reference numeral 12 is a fixing metal fitting for fixing both ends of the inflating portion 11 in the longitudinal direction to the supporting member 10.

  The inside of the lower packer portion 18 serves as a pressure fluid carrying passage 7. The pressure fluid carrying passage 7 has an upper end communicating with the pressure medium carrying passage 7 formed in the intermediate hose portion 15, and a lower end formed by a plug 19. It is closed. As a result, the pressure medium transport passage 7 formed in the head body 4, the pressure medium transport passage 7 formed between the outer periphery of the mantle 5 and the inner wall of the upper packer portion 9, and the pressure medium transport passage 7 formed in the nozzle portion 13 are formed. The upper end has an opening in the head 3 and the lower end is the expansion part 11 of the lower packer part 18 due to the pressure medium transfer path 7 inside the intermediate hose part 15 and the pressure fluid transfer path 7 inside the lower packer part 18. A pressure fluid transport passage 7 is formed which extends to the inner peripheral side and communicates with the inner peripheral side of the inflatable portion 11 of the upper packer portion 9 and the inner peripheral side of the inflatable portion 11 of the lower packer portion 18. Therefore, by supplying a pressure medium such as high-pressure air from the opening of the pressure medium conveying path 7 formed in the head body 4, the expansion section 11 of the upper packer section 9 and the expansion section 11 of the lower packer section 18 are arranged on the inner peripheral side. It is possible to receive the fluid pressure from the outer peripheral side to expand the outer peripheral side.

  Next, the chemical liquid supply hose will be described. FIG. 3 is a partial cross-sectional view for explaining the chemical liquid supply hose in this embodiment. Further, in the figure, 21 is a chemical solution supply hose, and 23 is a chemical solution hose body. Further, in FIG. 3, 3 is the head of the packer, and 22 is a bushing for connecting the chemical solution hose to the packer 2.

  That is, in this embodiment, the chemical solution supply hose 21 has a connecting portion 24 on the lower end side, which is connected to the head 3 via the bushing 23. The bushing 23 and the connecting portion 24 have a chemical liquid transfer passage 6 communicating with the chemical liquid hose main body 23 therein, and thereby, the chemical liquid hose main body 23 and the chemical liquid transfer passage 6 of the packer 2 can be connected. There is.

  Next, at the tip of the chemical liquid supply hose 21, a receiving portion for receiving the chemical liquid and sending it to the chemical liquid hose body 23 is attached. That is, in the drawing, 25 is a receiving portion, and the receiving portion 25 has an opening at the lower end portion to which the chemical liquid supply hose 21 is connected, and the front end is closed. A reception port 26 for receiving the chemical solution supplied from the chemical solution pump is formed on the side surface, and a chemical solution hose (not shown) connected to the chemical solution pump is connected to the reception port 26.

  Next, reference numeral 27 in FIGS. 1, 2, and 3 is an air discharge tube for releasing high pressure on the lower side of the lower packer portion 18 in the sleeve pipe. That is, as described above, in the process of injecting the chemical liquid, when the chemical liquid is released into the closed space formed in the sleeve pipe by high pressure in the process of injecting the chemical liquid, the chemical liquid leaks from the lower expansion portion to the lower side. In this case, the pressure gradually rises below the closed space in the sleeve pipe, and the packer is pushed up by the influence of this pressure, so that the chemical solution is injected to the correct location. Can be difficult. Furthermore, if the expansion section is released from expansion when the pressure on the lower side of the lower expansion section is high, the packer will be pushed up by the pressure and will suddenly rise, and the chemical solution supply hose and air hose will buckle and It may become unusable. Therefore, in the chemical liquid injector 1 of the present embodiment, the air discharge tube is provided to discharge the high pressure air in the sleeve pipe to the outside of the sleeve pipe.

  Here, the air discharge tube 27 will be described. In the present embodiment, the air discharge tube 27 penetrates the entire chemical solution supply hose 21 and the entire packer 2 in the longitudinal direction. Then, the upper end thereof penetrates the receiving portion 25 and projects above the receiving portion 25. Further, its lower end penetrates the plug 19 closing the lower end of the lower packer portion 18 and projects to the lower side of the plug 19.

  That is, the air discharge tube 27 penetrates the chemical solution supply hose 21 along the longitudinal direction, and the upper end projects above the chemical solution supply hose 21. Then, in the packer 2, up to the nozzle portion 13 is inserted into the chemical liquid transport path 6, and thereafter, penetrates the nozzle portion 13, and the pressure medium on the inner peripheral side of the intermediate hose portion 15 and the lower packer portion 18. The plug 19 is inserted in the transport path 7, and then penetrates through the plug 19 that closes the lower end opening of the lower packer portion 18 and projects below the plug 19. This allows high-pressure air on the lower side of the packer 2 to be discharged to the outside of the sleeve pipe.

  Next, the operation of the chemical liquid injector 1 of the present embodiment configured as described above will be described. In the case of performing ground improvement in the ground with the chemical liquid injector 1 of the present embodiment, a boring hole filled with a seal grout. The packer 2 to which the chemical solution supply hose 21 is connected is arranged at a predetermined position in the sleeve pipe inserted therein.

  Then, high-pressure air or the like is sent to the pressure medium transport path 7 to expand the expansion parts 11 of the upper packer part 9 and the lower packer part 18 to the outer peripheral side to fix the position of the packer 2 and the upper packer part 9 as well. A closed space is formed between the lower packer portion 18 and the lower packer portion 18.

  Then, in this state, a chemical solution for ground improvement such as cement milk is fed into the chemical solution transport path 6 of the packer 1 through the chemical solution supply hose 21, and the chemical solution is discharged from the chemical solution discharge port 14 into the sleeve pipe at high pressure. The closed space is filled with a chemical solution, and the chemical solution is further discharged.By discharging the chemical solution into the seal grout through the circular hole of the sleeve pipe, it penetrates the seal grout and permeates into the ground. , This will improve the ground.

  Then, at this time, in the chemical liquid injector 1 of the present embodiment, the chemical liquid supply hose 21 penetrates from the upper end to the lower end of the packer in the longitudinal direction, the upper end projects upward from the upper end of the chemical liquid supply hose 21, and the lower end Since the air discharge tube 27 protruding downward from the lower end of the packer is housed inside, the chemical liquid leaks downward from the inflating portion 11 of the lower packer portion 18 and the lower side of the closed space in the sleeve pipe. Even if the pressure rises, this pressure can be released to the outside of the sleeve pipe.Therefore, due to high pressure air, etc., the packer is misaligned and the air hose when releasing the expansion of the expansion part It is possible to effectively prevent buckling of the chemical liquid hose.

  INDUSTRIAL APPLICABILITY The chemical injection device of the present invention is generally applicable to chemical injection devices that form a closed space in a sleeve pipe and discharge the chemical at high pressure into the closed space.

DESCRIPTION OF SYMBOLS 1 Chemical injection device 2 Packer 3 Head 4 Head main body 5 Mantle 6 Chemical liquid transfer path 7 Pressure fluid transfer path 8 Constricted part 9 Upper packer part 10 Support member 11 Expansion part 12 Fixing metal fitting 13 Nozzle part 14 Chemical liquid discharge port 15 Intermediate hose part 16 Hose support member 17 Hose body 18 Lower packer part 19 Plug 21 Chemical solution supply hose 22 Bushing 23 Chemical solution hose body 24 Connecting part 25 Receiving part 26 Receiving port 27 Air releasing tube

Claims (4)

Head (3),
An upper packer having an expansion part (11) connected to the lower side of the head (3), which expands to the outer peripheral side by receiving fluid pressure toward the outer peripheral side and restores the original shape when the pressure is released. Part (9),
A nozzle part (13) connected to the lower side of the upper packer (9), the nozzle part (13) having a drug solution discharge port (14) for discharging a drug solution;
A lower part having an expansion part (11) connected to the lower side of the nozzle part (13), which expands to the outer peripheral side by receiving a fluid pressure toward the outer peripheral side and restores the original shape when the pressure is released. And a packer part (18),
An upper end has an opening in the head (3), and a lower end has a chemical liquid transport path (6) communicating with the chemical liquid discharge port (14);
The upper end has an opening in the head (3) and the lower end reaches the inner peripheral side of the inflating part (11) of the lower packer part (18) and the inner peripheral side of the inflating part (11) of the upper packer part (9). And a packer (2) including a pressure fluid transfer path (7) communicating with the inner peripheral side of the expansion section (11) of the lower packer section (18),
A chemical injection device comprising a chemical supply hose (21) connected to the upper side of the head (3) and supplying a chemical to the chemical transfer path (6),
It penetrates from the upper end of the chemical liquid supply hose (21) to the lower end of the packer (2) along the longitudinal direction, the upper end projects upward from the upper end of the chemical liquid supply hose (21), and the lower end thereof is the lower end of the packer (2). A drug solution injector characterized in that an air discharge tube (27) protruding downward from the inside is housed inside.   The head (3) includes a head body (4) having a chemical liquid transfer path (6) having an opening at an end of the head (3), and the head body (4) connected below the head body (4). The mantle (5) having the chemical liquid transport path (6) continuous to the chemical liquid transport path (6) formed in 4) is provided, and the mantle (5) penetrates through the inside of the upper packer part (9), An upper packer part (9) is provided below the head (3) so that the chemical liquid transfer path (6) formed in (5) is connected to the nozzle part (13) so as to communicate with the chemical liquid discharge port (14). ) Are connected, The chemical | medical solution injection device of Claim 1 characterized by the above-mentioned.   The chemical liquid supply hose (21) has a connecting portion (24) connected to the head (3) and a receiving portion (25) having a receiving opening (26) for receiving the chemical liquid supplied from the chemical liquid pump. At the same time, the receiving port (26) is formed on the side of the receiving portion (25), and the chemical liquid injector according to claim 1 or 2. The air discharge tube (27) is
While penetrating the chemical liquid supply hose (21) along the longitudinal direction,
In the packer (2), the lower end of the packer (2) protrudes downward from the lower end of the packer (2), penetrating the chemical liquid transport path (6) and further penetrating the inner peripheral side of the lower packer part (18). The chemical injection device according to any one of claims 1 to 3, characterized in that.

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