JP7388657B2 - double packer equipment - Google Patents

Description

The present invention relates to a double packer device, and more particularly to a double packer device that is housed movably along the central axis direction with respect to an outer injection tube.

Patent Document 1 describes a conventional double packer device. The double packer device described in Patent Document 1 (referred to as the "inner injection tube" in Patent Document 1) is inserted into the outer injection tube. The inner injection tube is provided with a pair of packer portions on both sides of the inner injection tube in the longitudinal direction with respect to the chemical liquid ejection hole.

The packer section is made of rubber, and is configured to expand when an injection material is supplied inside and return to its original state when the injection material inside is discharged. In the inner injection tube, the pair of packer parts expand, and the chemical liquid is ejected from the liquid injection hole with the pair of packer parts in close contact with the inner circumferential surface of the outer injection tube. After ejecting the chemical solution, the injection material in the packer section is discharged, and with the packer section restored, the inner injection tube is moved to another position within the outer injection tube, and the packer section is expanded again and the drug solution is ejected.

Japanese Patent Application Publication No. 2007-332544

By the way, to erect the outer injection pipe underground, it is done as follows. After drilling a hole in the ground using a casing pipe, the hole formed by drilling is filled with seal grout material. After this, the injection outer pipe is inserted into the casing pipe and the injection outer pipe is installed.

At this time, since the casing pipe is filled with seal grout material, when the outer injection tube is inserted, a pushing force is applied to the outer injection tube due to the action of buoyancy. For this purpose, the outer injection tube is pushed into the casing pipe while water is being injected into the outer injection tube.

In order to arrange the inner injection tube described in Patent Document 1 above in this outer injection tube, it is necessary to push the inner injection tube against the resistance of the water filled inside the outer injection tube, resulting in poor workability. There was a problem.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a double packer device that has good workability when placed inside an injection outer pipe filled with water.

A double packer device according to one aspect of the present invention is housed in an outer injection tube so as to be movable along a central axis of the outer injection tube, and is capable of discharging a drug solution from a discharge port at any position in the direction of the central axis. The double packer device includes: an injection pipe having the discharge port for discharging the chemical liquid along a direction intersecting the central axis; and an end surface formed on the injection pipe in the central axis direction of the injection pipe; and a drain passage passing through the other end surface.

The double packer device of the above aspect according to the present invention can move the water filled in the outer injection pipe from the bottom to the top through the water drainage channel, so there is resistance to water when inserting it into the outer injection pipe. This has the advantage of being easy to work with and preventing the insertion from becoming difficult.

FIG. 1 is a sectional view showing a hole drilling process of a ground injection method using a double packer device according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing the seal grout injection process of the above-mentioned ground injection method. FIGS. 3(a) and 3(b) are cross-sectional views showing the process of installing an outer pipe in the ground injection method described above. FIG. 4 is a cross-sectional view showing the chemical injection process of the ground injection method described above. FIG. 5(A) is a sectional view of a cross section perpendicular to the central axis of the double packer device according to the above embodiment. FIG. 5(B) is a cross-sectional view taken along the line X1-X1 in FIG. 5(A). FIG. 6(A) is a cross-sectional view of the double packer device perpendicular to the central axis. FIG. 6(B) is a sectional view taken along the line X3-X3 in FIG. 6(A). FIG. 7(A) is a cross-sectional view of the double packer device perpendicular to the central axis. FIG. 7(B) is a sectional view taken along the line X2-X2 of FIG. 6(A). FIGS. 8(A) and 8(B) are cross-sectional views showing the operation of the drive unit of the double packer device same as above. FIG. 9 is a flowchart showing a process diagram of the ground injection method described above. It is a sectional view of the section perpendicular to the central axis of the double packer device concerning the embodiment same as the above. FIG. 6(B) is a sectional view taken along the line X3-X3 in FIG. 6(A).

<Embodiment>
(1) Overall The double packer device 1 according to the present embodiment will be described below with reference to the drawings.

The double packer device 1 is a device that discharges a medical solution that is movably accommodated inside the outer injection tube 8 along the central axis of the outer injection tube 8 . The double packer device 1 discharges a chemical solution to the outer injection tube 8 while being fixed at an arbitrary position on the central axis of the outer injection tube 8 by a pair of packer parts.

The double packer device 1 according to this embodiment is used, for example, in the ground injection method shown in FIGS. 1 to 4. The ground injection method is a method used to improve soil strength, reduce water permeability, and suppress liquefaction. First, the outline of the ground injection method will be explained, and then the double packer device according to this embodiment will be explained in detail.

In the ground injection method, as shown in FIG. 1, a casing pipe 5 is used to drill a hole in the land where ground improvement is to be performed to form at least one hole 9 (hole drilling step). Thereafter, as shown in FIG. 2, the seal grout material 7 is injected into the hole 9 (seal grout injection step), and as shown in FIG. 3, after inserting the injection outer pipe 8 into the casing pipe 5, 5 from the hole 9 and install the outer injection pipe 8 (outer injection pipe installation process).

Thereafter, as shown in FIG. process).

In the chemical liquid injection process, in the double packer device 1, as shown in FIG. liquid can be discharged at the same time. In the conventional double pipe double packer injection method, after the primary injection of liquid A, the double packer device 1 is pulled out to the ground, the inside of the pipe of the double packer device 1 is cleaned, and then the double packer device 1 is inserted into the injection outer pipe 8 again. A secondary injection was performed by inserting it into the In contrast, in the double packer device 1 according to the present embodiment, the B liquid can be discharged without moving from the position at which the A liquid was discharged, so that the construction period can be shortened.

"Liquid A" here refers to a main agent, and examples include one or more of water glass, non-alkaline silica sol, and colloidal silica. Further, "Liquid B" is a drug that promotes caking when mixed with Liquid A, and examples thereof include one or more of cement, slag, and slaked lime.

(2) Double packer device As shown in FIG. 5(B), the double packer device 1 includes an injection pipe 10 having a discharge port 11, a pair of packer sections 2, a pair of drive sections 4, and a pair of fixed sections. 31, and a pair of connecting portions 32.

The injection pipe 10 constitutes the main body of the double packer device 1. The injection pipe 10 is formed in a cylindrical shape, and its outer diameter is smaller than the inner diameter of the outer injection pipe 8. A connecting portion 101 to which a rod 91 (described later) is connected is formed at the upper end of the injection pipe 10 in the central axis direction. The connecting portion 101 and the rod 91 will be described in detail in "(3.4) Chemical liquid injection process" below.

Inside the injection pipe 10, as shown in FIG. A channel 14, a second flow channel 15, and a drain channel 16 are formed. The hydraulic oil passages 12 and 13, the first passage 14, the second passage 15, and the water drain passage 16 extend along the circumferential direction around the central axis of the injection pipe 10 (i.e., the central axis of the outer injection pipe 8). They are lined up. Therefore, in the cross section perpendicular to the central axis, the drain passage 16, the first passage 14, and the second passage 15 are formed at different positions without overlapping centers.

The first flow path 14 is a flow path through which liquid A passes, and the second flow path 15 is a flow path through which liquid B passes. The first flow path 14 and the second flow path 15 have centers at different positions in the cross section. Discharge ports 11 are formed at the downstream end of the first flow path 14 and the downstream end of the second flow path 15, respectively.

The discharge port 11 is an opening that discharges a chemical solution. A plurality of discharge ports 11 are formed in the injection pipe 10 , and the plurality of discharge ports 11 are formed at a central portion of the injection pipe 10 in the central axis direction. However, in the present invention, the discharge port 11 may be formed at a position that is biased upward or downward in the central axis direction of the injection pipe 10. The discharge port 11 opens in a direction intersecting the axial direction of the injection pipe 10 (here, a direction along a virtual plane perpendicular to the central axis of the outer injection tube 8), and is disposed between the pair of packer parts 2. has been done.

A check valve 110 is provided at each of the plurality of discharge ports 11. The check valve 110 allows the chemical liquid (liquid A or B) to be discharged from the discharge port 11, but prevents the liquid from flowing into the discharge port 11 from the outside to the inside. The check valve 110 according to this embodiment is composed of a rubber band that covers the discharge port 11, and a slit is formed in the rubber band at a position corresponding to the discharge port 11. By providing the discharge port 11 with a check valve, it is possible to discharge only the A liquid or the B liquid, for example.

As shown in FIG. 6(B), the drain passage 16 penetrates one end surface and the other end surface of the injection pipe 10 in the central axis direction. Here, "one end surface" is the lower end surface, and "the other end surface" is the upper end surface. The water drain passage 16 reduces the resistance received from the water filled in the outer injection tube 8 when the double packer device 1 is inserted into the outer injection tube 8 in the chemical injection process described below. In the drain passage 16, a first portion 161, a second portion 162, and a third portion 163 communicate with each other along the central axis direction. The first portion 161, the second portion 162, and the third portion 163 are connected in this order from the bottom to the top, and the inner diameter becomes larger toward the bottom.

As shown in FIG. 5(B), the pair of packer parts 2 are provided on both sides of the injection pipe 10 in the central axis direction with respect to the discharge port 11. A drive section 4 is connected to each packer section 2. Each packer section 2 is switched between an inflated position and a non-inflated position by a drive section 4. The bulging position means a position where the packer portion 2 bulges out and contacts the inner circumferential surface of the outer injection tube 8 (see FIG. 8(A)). The non-bulging position means a position where the packer portion 2 is away from the inner circumferential surface of the outer injection tube 8 (see FIG. 8(B)). Therefore, when the packer part 2 is in the non-inflated position, the double packer device 1 can be moved along the central axis of the injection outer tube 8. On the other hand, when the packer section 2 is in the expanded position, the double packer device 1 is fixed to the outer injection tube 8, and thus is fixed at any position in the central axis direction of the outer injection tube 8.

As shown in FIG. 7(B), the packer portion 2 has a substantially C-shaped cross section and has a hollow portion. The packer section 2 is made of an elastic body that can be elastically deformed. Examples of the elastic body include natural rubber, thermoplastic elastomer, soft resin, thermosetting elastomer, synthetic rubber, etc. Examples of the thermosetting elastomer include silicone rubber, urethane rubber, fluororubber, etc. .

Here, in the packer section 2, the direction along the central axis of the outer injection pipe 8 is defined as the "width direction", and the direction along the outer periphery of the injection pipe 10 is defined as the "length direction". The packer portion 2 is continuous in the length direction and is formed in an endless shape. The packer section 2 has one end in the width direction fixed to the injection pipe 10 by a fixed part 31, and the other end in the width direction fixed to the movable part 42 of the drive part 4 by a connecting part 32.

The fixing part 31 is fixed to the injection pipe 10 and attaches one end of the packer part 2 (here, the outer end of the injection pipe 10 in the central axis direction) to the injection pipe 10. The fixing portion 31 is formed over the entire length of the injection pipe 10 in a direction along the outer periphery, and is formed in a ring shape. Attachment of the fixing part 31 to the injection pipe 10 is achieved by, for example, fitting, welding, screwing, screwing, hooking, pinning, etc.

The connecting portion 32 attaches an end portion of the packer portion 2 in the width direction opposite to the end portion on the fixed portion 31 side to the movable portion 42 of the drive portion 4 . The connecting part 32 is formed in a ring shape and can move in the vertical direction with respect to the injection pipe 10. The connection portion 32 and the packer portion 2 are attached by, for example, fitting, welding, adhesion, screwing, screwing, pinning, or the like.

The drive unit 4 switches the packer unit 2 between a bulging position and a non-bulging position. In the double packer device 1 according to this embodiment, as shown in FIG. 7(B), a pair of drive units 4 are provided one-to-one with respect to a pair of packer units 2. Each drive unit 4 is constituted by a hydraulic cylinder, and is connected to a pair of hydraulic oil channels 12 and 13. The pair of drive parts 4 can simultaneously switch the pair of packer parts 2 from the non-bulging position to the bulging position, and can also simultaneously switch the pair of packer parts 2 from the bulging position to the non-bulging position. Each drive section 4 includes a cylinder tube 41 and a movable section 42 that moves relative to the cylinder tube 41, as shown in FIGS. 8(A) and 8(B).

The movable part 42 can reciprocate along the central axis direction with respect to the cylinder tube 41. As shown in FIG. 8(B), the movable part 42 moves each packer part 2 from the bulging position to the non-bulging position by moving toward the center (one direction) of the injection pipe 10 along the central axis direction. Switch to Furthermore, as shown in FIG. 8(A), the movable part 42 moves each packer part 2 from the non-inflated position by moving toward the end side (the other direction) of the injection pipe 10 along the central axis direction. It can be switched to the expanded position.

The movable part 42 is formed in a cylindrical shape and can move along the outer peripheral surface of the injection pipe 10. The packer portion 2 is attached to the end of the movable portion 42 on the opposite side from the cylinder tube 41 in the central axis direction via the connecting portion 32 .

The cylinder tube 41 moves the movable part 42 as hydraulic oil flows in and out. The cylinder tube 41 is fixed to the injection pipe 10. A first pressure chamber 411 and a second pressure chamber 412 are formed inside the cylinder tube 41. The first pressure chamber 411 communicates with the first hydraulic fluid flow path 12 . The second pressure chamber 412 communicates with the second hydraulic oil flow path 13 .

As shown in FIG. 8(B), when hydraulic oil flows into the first pressure chamber 411 from the first hydraulic oil flow path 12, the first pressure chamber 411 expands, while the second pressure chamber 412 narrows, and the second pressure chamber 411 expands. Hydraulic oil is discharged from the pressure chamber 412 to the second hydraulic oil flow path 13 . Then, the movable portion 42 moves from the expanded position to the non-expanded position. On the other hand, as shown in FIG. 8(A), when hydraulic oil flows into the second pressure chamber 412 from the second hydraulic oil passage 13, the second pressure chamber 412 expands, while the first pressure chamber 411 narrows. Hydraulic oil is discharged from the first pressure chamber 411 to the first hydraulic oil passage 12 . Then, the movable portion 42 moves from the non-expanded position to the expanded position.

Therefore, when the movable part 42 moves in the direction of protruding from the cylinder tube 41, the fixed part 31 and the connecting part 32 come close to each other, as shown in FIG. The other end is close to the other end. Then, the portion between one end and the other end of the packer section 2 in the width direction swells outward in the radial direction of the injection pipe 10 and hits the inner circumferential surface of the outer injection pipe 8, so that the packer section 2 becomes non-contact. It can be switched from the inflated position to the inflated position.

On the other hand, when the movable part 42 moves in the direction of being drawn into the cylinder tube 41, the fixed part 31 and the connecting part 32 are separated, and one end of the packer part 2 in the width direction and the other end are separated. Then, the portion between one end and the other end in the width direction of the packer portion 2 becomes flat, and the portion separates from the inner circumferential surface of the outer injection tube 8. As a result, the packer portion 2 is switched from the inflated position to the non-inflated position.

In this way, according to the double packer device 1 according to the present embodiment, when the packer part 2 is switched from the inflated position to the non-inflated position, the movement of the movable part 42 is performed instead of being restored by the elastic force of the packer part 2. You can force the switch by using Therefore, even if the deformation rate of the packer portion 2 at the inflated position is greater than that at the non-inflated position, it is possible to appropriately switch to the non-inflated position. Furthermore, since the packer section 2 is switched between the non-inflated position and the inflated position by the operation of the movable section 42, the operation of the packer section 2 can be stabilized. As a result, malfunctions such as the packer section 2 not being switched to the non-inflated position when attempting to move the double packer device 1 along the central axis of the outer injection tube 8 in the chemical injection process can be avoided. I can do it.

(3) Ground injection method As shown in FIG. 9, the ground injection method includes a hole drilling process ST1, a seal grout injection process ST2, an injection outer pipe installation process ST3, and a chemical liquid injection process ST4.

(3.1) Hole Drilling Process As shown in FIG. 1, the hole drilling process is a process of drilling a hole in the ground to form at least one hole 9 (boring hole) in the ground. In the hole drilling process, a hole 9 is formed in the ground using a hole drilling machine 6. The axial direction of the hole 9 is perpendicular to the ground and approximately parallel to the vertical direction. However, in the present invention, the axial direction of the hole 9 is not limited to the vertical direction, and may be inclined with respect to the vertical direction, or may not be perpendicular to the ground.

The hole drilling machine 6 uses the casing pipe 5 to drill a hole in the ground. Examples of the drilling machine 6 include a rotary drilling machine, a backhoe drilling machine, a hanging drilling machine, a rotary percussion drilling machine, and the like.

The double packer device 1 according to the present embodiment can stably switch to the non-expanded position even if the outer diameter of the packer section 2 in the expanded position is increased, so that the casing pipe 5 for drilling holes can be stably switched to the non-expanded position. The outer diameter can be increased. The nominal diameter of the casing pipe according to this embodiment is, for example, preferably 175A or more and 300A or less, and more preferably 200A. Here, the nominal diameter 175A corresponds to an outer diameter of about 190.7 mm, the nominal diameter 300A corresponds to an outer diameter of about 318.5 mm, and the nominal diameter 200A corresponds to an outer diameter of about 216.3 mm. Therefore, in the double packer device 1 according to the present embodiment, the rigidity of the casing pipe 5 can be increased, and the accuracy of drilling can be increased.

(3.2) Seal grout injection process The seal grout injection process is a process of injecting the seal grout material 7 into the hole 9 drilled by the casing pipe 5, as shown in FIG. By inserting the injection pipe 70 into the casing pipe 5 buried in the ground and injecting the seal grout material 7, the hole 9 is filled with the seal grout material 7.

(3.3) Outer injection pipe erecting process The outer injection pipe erecting process is a process in which the outer injection pipe 8 is built into the hole 9 formed in the drilling process after the seal grout injection process. In the injection outer pipe erecting process, as shown in FIG. 3(A), the injection outer pipe 8 is inserted from above into the casing pipe 5 embedded in the hole drilling process.

At this time, since the casing pipe 5 is filled with the seal grout material 7, it is difficult to insert the outer injection pipe 8 due to buoyancy. Therefore, in the injection outer tube erecting process, the injection outer tube 8 is inserted while pouring water W1 into the inner injection outer tube 8.

After inserting the injection outer pipe 8 into the casing pipe 5, the casing pipe 5 is pulled out from the hole 9, and the casing pipe 5 is taken out from the hole 9. Thereby, the injection tube 8 can be inserted into the hole 9.

The outer injection tube 8 includes an outer tube main body 81 having a plurality of injection ports 82 and a check valve 83, as shown in FIG. 3(A). The outer tube main body 81 is a part that constitutes the main body of the outer injection tube 8, and is constituted by a pipe whose outer diameter is smaller than the inner diameter of the casing pipe 5. The outer tube body 81 is made of, for example, metal, synthetic resin, glass fiber, fiber-reinforced plastic, carbon, or the like.

A plurality of injection ports 82 are formed in the outer tube main body 81 at regular intervals along the vertical direction. The pitch of the injection ports 82 is preferably set to 0.1 or more and 1.0 m or less. Each injection port 82 penetrates the outer tube main body 81 in the radial direction. Further, a plurality of injection ports 82 are formed in the outer tube main body 81 at the same position in the axial direction and at regular intervals in the circumferential direction. Each injection port 82 may be a round hole or a slit-like hole.

Here, in this embodiment, the outer diameter of the outer tube main body 81 is, for example, 100 mm or more, and more specifically, 140 mm (VP125A). If the outer diameter of the outer tube main body 81 can be increased, the length in the circumferential direction can also be increased, so that the number of injection ports 82 arranged in the circumferential direction can be increased. When the number of injection ports 82 arranged in the circumferential direction is large, the permeation range of the chemical solution is expanded, so that the pitch of the injection ports 82 arranged in the vertical direction can be widened. Furthermore, by increasing the number of injection ports 82, the overall discharge amount can be increased while suppressing the discharge speed of the chemical solution, so that effective penetrating injection can be performed without causing split injection.

The check valve 83 prevents the flow of liquid from the outside to the inside of the inlet 82, and allows the passage of fluid from the inside to the outside. The check valve 83 is composed of a cylindrical rubber belt that covers the injection port 82. The rubber belt is attached to the outer peripheral surface of the outer tube body 81 by being wound around the outer tube body 81. A slit is formed in the rubber belt at a position corresponding to the injection port 82 (that is, a position communicating with the injection port 82). The slit opens when pressure is applied from the inside in the thickness direction (injection port 82 side), but does not open and remains closed even when pressure is applied from the outside.

(3.4) Chemical liquid injection process The chemical liquid injection process is a process of injecting a chemical liquid using the double packer device 1, as shown in FIG. In the chemical liquid injection step, as shown in FIG. 3(B), the double packer device 1 is inserted into the outer injection tube 8 after the outer injection tube erecting step.

At this time, the outer injection tube 8 is filled with water W1, but the double packer device 1 is provided with a drain passage 16. Therefore, the double packer device 1 can be arranged at the lower end of the outer injection tube 8 relatively easily.

The double packer device 1 can move along the axial direction inside the outer injection tube 8 . Therefore, the double packer device 1 is fixed to the inner circumferential surface of the outer injection tube 8 by moving from the bottom to the top of the outer injection tube 8 and switching the packer section 2 to the expanded position at a predetermined position. Ru. Then, in this state, liquid A and liquid B are discharged from the discharge port 11. Liquid A and liquid B are filled in a space surrounded by the outer injection pipe 8, the injection pipe 10, and the pair of packer parts 2, and are injected through the injection port 82 of the outer injection pipe 8 and the check valve 83. It comes out from the outer tube 8.

The chemical solution discharged from the injection outer pipe 8 cracks the seal grout material 7 and penetrates into the ground. In this embodiment, since liquid A and liquid B come out of the injection tube 8 in a mixed state, the chemical liquid can be solidified relatively quickly. The solidification time of the chemical liquid can be adjusted by adjusting the blending ratio of liquid A and liquid B, so the solidification time can be set according to the site. Therefore, according to the ground injection method according to the present embodiment, it is possible to perform construction appropriately even in places where the groundwater flow rate is high.

The double packer device 1 according to this embodiment includes a rod 91 that is removably attached to the connection portion 101 of the injection pipe 10. The rod 91 is connected separately from the piping connected to the pair of hydraulic oil passages (the first hydraulic oil passage 12 and the second hydraulic oil passage 13), the first passage 14, and the second passage 15. be done. The rod 91 has rigidity and is made of, for example, metal such as steel, stainless steel, titanium, or aluminum, ceramic, high-strength resin, or the like. According to the rod 91, the double packer device 1 can be pushed toward the lower end of the outer injection tube 8.

"Having rigidity" as used herein means having a degree of difficulty in bending that allows injection pipe 10 to be pushed into injection outer pipe 8 filled with water W1. Further, the rod may be hollow or solid.

The connection between the injection pipe 10 and the rod 91 is achieved, for example, by screwing, fitting, pinning, screwing, concave-convex fitting, or the like. The connecting portion 101 according to this embodiment is configured with a male screw.

<Modified example>
The above embodiment is only one of various embodiments of the present invention. The embodiments can be modified in various ways depending on the design, etc., as long as the object of the present invention can be achieved. Modifications of the embodiment will be listed below. The modified examples described below can be applied in combination as appropriate.

In the above embodiment, the packer part 2 is switched between the inflated position and the non-inflated position by the driving part 4, but in the present invention, the packer part is made of expandable rubber, and is injected with an injection material such as water or air. It may have a structure that expands.

In the embodiment described above, the drain passage 16 is formed so that the diameter becomes larger toward the lower side in the central axis direction, but in the present invention, the drain passage 16 may have a uniform cross section in the vertical direction. Further, in the embodiment described above, the drain passage 16 is a hole that penetrates from one end surface to the other end surface of the injection pipe 10, but in the present invention, the water drain passage 16 is a hole that penetrates from one end surface to the other end surface of the injection pipe 10. ) may also be formed in the shape of an open cutout.

In the embodiment described above, the chemical liquid discharged from the double packer device 1 is a two-part type chemical liquid, that is, a liquid A and a liquid B, but in the present invention, it may be a one-part type chemical liquid.

The injection of chemical liquid in the chemical liquid injection process uses a step-up method in which the chemical liquid is discharged sequentially from the bottom to the top, but in the present invention, a step-down method is adopted in which the chemical liquid is discharged from the top to the bottom. may be adopted.

In the embodiments described above, the check valves 110 and 83 were formed with slits, but they may be formed of rubber belts without slits. In this case, when internal pressure is applied to the rubber belt, the chemical solution is discharged from the ends in the width direction of the rubber belt.

The double packer device 1 according to the above embodiment includes a pair of hydraulic oil channels (a first hydraulic oil channel 12 and a second hydraulic oil channel 13), and piping connected to the first channel 14 and the second channel 15. Separately, a rigid rod 91 is connected, but in the present invention, the piping may be housed inside the rod 91.

In this specification, expressions accompanied by "approximately" such as "approximately parallel" or "approximately perpendicular" may be used. For example, "substantially parallel" means substantially "parallel", and includes not only a strictly "parallel" state but also an error of several degrees. The same applies to other expressions accompanied by "abbreviation".

Further, in this specification, expressions such as "end" and "end" are used that are distinguished by the presence or absence of "...part". For example, "end" means a part that has a certain range that includes the "end." The same applies to other expressions accompanied by "...part".

<Summary>
As explained above, the double packer device 1 according to the first aspect is housed in the outer injection tube 8 so as to be movable along the central axis of the outer injection tube 8, and discharges at any position in the direction of the central axis. This is a double packer device 1 capable of discharging a chemical solution from an outlet 11. The double packer device 1 includes an injection pipe 10 having a discharge port 11 for discharging a chemical liquid along a direction intersecting the central axis, and an injection pipe 10 having one end surface and the other end surface in the central axis direction of the injection pipe 10. A drain passage 16 passing through the drain passage 16 is provided.

According to this aspect, when inserting the double packer device 1 into the outer injection pipe 8, even if the outer injection pipe 8 is filled with water W1, the water drain passage 16 can reduce the resistance of the water W1. That is, since the water W1 filled in the outer injection pipe 8 can be moved from the bottom to the top through the water drain passage 16, it is difficult to insert the water into the outer injection pipe 8 due to the resistance of the water. can be prevented and workability can be improved.

In the double packer device 1 according to the second aspect, the injection pipe 10 has a plurality of discharge ports 11 in the first aspect. The injection pipe 10 has a first flow path 14 formed along the central axis direction inside the injection pipe 10 and connected to one of the discharge ports 11 among the plurality of discharge ports 11, and a first flow path 14 formed along the central axis direction inside the injection pipe 10. , and a second flow path 15 that is connected to one discharge port 11 and another discharge port 11 . Each of the drain passage 16, the first flow passage 14, and the second flow passage 15 is arranged along the circumferential direction around the central axis.

According to this aspect, the drain passage 16, the first passage 14, and the second passage 15 can be formed in the injection pipe 10.

In the double packer device 1 according to the third aspect, in the first or second aspect, the drain passage 16 is formed so that the inner diameter becomes larger toward the lower side in the central axis direction.

In the double packer device 1 according to the fourth aspect, in any one of the first to third aspects, the injection pipe 10 is formed at the upper end in the central axis direction, and the connection to which the rigid rod 91 is connected. It has a section 101.

According to this aspect, when the rod 91 is attached to the connecting portion 101, the double packer device 1 can be pushed into the injection outer tube 8 filled with water W1.

The double packer device 1 according to the fifth aspect further includes a rod 91 connected to the connecting portion 101 in the fourth aspect.

According to this aspect, the double packer device 1 can be pushed into the injection outer pipe 8 filled with water W1 by pushing using the rigid rod 91.

1 Double packer device 10 Injection pipe 101 Connection part 11 Discharge port 14 First channel 15 Second channel 16 Drain channel 2 Packer part 91 Rod

Claims (5)

A double packer device that is movably housed in an injection outer tube along a central axis of the outer injection tube and capable of discharging a drug solution from a discharge port at any position in the direction of the central axis,
an injection pipe having the discharge port that discharges the chemical liquid along a direction intersecting the central axis;
a drain passage formed in the injection pipe and passing through one end surface and the other end surface of the injection pipe in the central axis direction;
Equipped with
Double packer device. The injection pipe has a plurality of the discharge ports,
The injection pipe is
a first flow path formed along the central axis direction inside the injection pipe and connected to one of the plurality of discharge ports;
a second flow path formed along the central axis direction inside the injection pipe and connected to a discharge port different from the first discharge port;
has
Each of the drain passage, the first flow passage, and the second flow passage are arranged along a circumferential direction centering on the central axis,
The double packer device according to claim 1. The water drain passage is formed such that the inner diameter becomes larger toward the lower side in the central axis direction.
The double packer device according to claim 1 or claim 2. The injection pipe has a connection part formed at an upper end in the direction of the central axis and to which a rigid rod is connected.
The double packer device according to any one of claims 1 to 3. further comprising the rod connected to the connection part,
The double packer device according to claim 4.

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