JP3184752B2 - Injection inner pipe used for double pipe double packer method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inner filling pipe used in a ground improvement method, particularly a double pipe double packer filling method which is one of chemical liquid filling methods.

[0002]

2. Description of the Related Art One of the ground improvement methods for improving the properties of the ground is a chemical liquid injection method. The chemical injection method is performed by drilling the ground and injecting cement, bentonite, water glass, and other chemicals into the ground from the excavation hole, and various methods have been developed.

One of the chemical liquid injection methods is a double pipe double packer injection method. Double pipe double packer injection method,
In recent years, it has achieved many construction results because it can reliably improve the target ground layer and can be repeatedly injected.

[0004] The double-pipe double-packer pouring method is to first drill a target ground with a casing, and then install an outer pouring pipe having a pouring hole at a predetermined interval in an axial direction in the casing. Insert the injection inner tube with a double packer, which has a chemical solution ejection hole at the tip end and a packer above and below the ejection hole in the axial direction, into the outer injection tube, and move the inner injection tube in the axial direction to perform injection. In this method, the injection hole of the inner tube is made to coincide with the injection hole of the outer tube, and the chemical solution is injected into the ground at each step while sequentially stepping up from the innermost injection hole.

[0005] Various types of such injection inner tubes have been developed and provided. Among them, typical ones are (1)
There are O-ring double packers and (2) hydraulic double packers.

(1) The O-ring type double packer is such that a ring is fitted around the outer periphery of a solid packer so that a chemical solution to be injected into the ground does not leak from between the packers.

(2) The hydraulic double packer is of a type in which a balloon-like packer is inflated with high-pressure water and sealed.

[0008]

However, the prior art has the following problems.

(1) The O-ring type double packer includes:
(A) The packer according to the O-ring type double packer cannot be contracted because it is solid, and the friction between the outer periphery of the O-ring and the inner surface of the outer injection tube causes much labor for inserting and extracting the inner injection tube. Requires,

(B) Since the inner tube is made of steel, it cannot be inserted if the outer tube is bent;

(C) Since the inner pipe is made of steel, there is a problem that a lot of labor and time are required for adding and releasing the pipe.

(2) 'The hydraulic double packer can perform the work by contracting the packer at the time of insertion and withdrawal, so that the work can be performed very easily.

However, since (a) the inner tube of injection has a double tube structure composed of a system for injecting a chemical solution and a system for expanding and contracting the packer, the disassembling and assembling work at the time of cleaning the inner tube for injection, etc. It takes a lot of time to clean (chemicals (chemicals) solidify without cleaning, making subsequent use impossible)

(B) The diameter of the injection inner tube becomes large, and it is impossible to cope with a small diameter injection outer tube.

(C) Increasing the diameter of the outer injection tube in accordance with the diameter of the inner injection tube increases the amount of the drug solution to be injected, resulting in poor economic efficiency.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to reduce the labor required for insertion and withdrawal operations of the injection inner tube and to make the outer injection tube bent. Another object of the present invention is to provide an infusion tube used in the double-tube double-packer method, which can be inserted even if it is used, and can simplify the structure and improve the economic efficiency.

[0017]

The gist of the present invention is to provide an ejection hole provided at a tip end portion, and an upper and lower expandable rubber and a lower packing which are respectively provided above and below the ejection hole. After drilling the ground with a casing, the ground is inserted into an injection outer pipe having an injection hole at predetermined intervals in the axial direction, which is built in the casing, and is moved in the axial direction to eject the injection hole. To the injection hole of the outer injection tube, and inject the drug solution into the ground from each injection hole, the injection inner tube used in the double pipe double packer method, the outer surface of the portion where the ejection hole exists, this A sleeve is provided so that a chemical solution can be ejected from between the outer side surface and the lower plunger. The lower plunger is slidably fitted in a lower cylinder communicating with the inside of the lower packer rubber. Oil is sealed in a space surrounded by the lower packer rubber and the lower cylinder so that the rubber expands and contracts, and communicates with the inside of the upper packer rubber, the ejection hole, and the lower cylinder so that the lower plunger can be pressed. The present invention resides in an injection inner pipe used in a double pipe double packer method, in which a chemical liquid injection flow path through which a chemical liquid pumped from the ground flows is formed. Claim 2
The gist of the described invention is that an ejection hole provided at a tip portion,
It has an upper and lower expandable rubber and a lower rubber, which are respectively provided above and below the ejection hole. After drilling the ground with a casing, the ground is built in the casing, and a predetermined interval is set in the axial direction. A double pipe double packer method, in which the injection hole is inserted into the injection outer tube having an injection hole, and is moved in the axial direction so that the ejection hole matches the injection hole of the injection outer tube, and the chemical solution is injected into the ground from each injection hole. A sleeve is provided on an outer surface of a portion where the ejection hole is present, so that a chemical solution can be ejected from between the outer surface and the inside of the upper cylinder that communicates with the inside of the upper packer rubber. The upper plunger is slidably fitted, and the oil is sealed in a space surrounded by the upper packer rubber and the upper cylinder so that the upper packer rubber expands and contracts as the upper plunger slides. The inside of the lower packer rubber, the ejection hole, and the upper cylinder so as to be able to press the upper plunger, and a chemical liquid injection flow path through which the chemical liquid pumped from the ground flows is formed inside. Characterized in that the inner tube used for the double tube double packer method. The gist of the invention according to claim 3 is to have an ejection hole provided at a tip portion, and upper and lower expandable rubber and lower packer rubber respectively provided above and below the ejection hole. After being drilled by this, it is inserted into an injection outer tube having an injection hole at predetermined intervals in the axial direction, which is built in this casing, and is moved in the axial direction to match the injection hole with the injection hole of the injection outer tube. Injecting the chemical solution into the ground through each injection hole, this is an injection inner tube used for the double pipe double packer method, and ejects the chemical solution from the outer surface of the part where the ejection hole exists to the outside surface The upper plunger is slidably inserted in an upper cylinder communicating with the inside of the upper packer rubber, and the upper pack is expanded and contracted by sliding of the upper plunger. Oil is sealed in a space surrounded by the car rubber and the upper cylinder, and the lower plunger is slidably inserted in the lower cylinder communicating with the inside of the lower packer rubber, and the lower plunger rubber is slid by sliding the lower plunger. Oil is sealed in a space surrounded by the lower packer rubber and the lower cylinder so as to expand and contract, and presses the upper cylinder and the lower plunger so as to be able to press the inside of the upper packer rubber, the ejection hole, and the upper plunger. Injection inner pipe used for the double pipe double packer method, characterized in that a chemical injection path is formed inside, which communicates with the lower cylinder as much as possible and through which the chemical pumped from the ground flows. Exists.

Since the packer for the infusion tube according to the present invention can be expanded and contracted, the labor required for inserting and lifting the infusion tube can be reduced. Also, insertion is possible even if the outer injection tube is bent.

In addition, since it is not a double tube structure, it is possible to reduce the diameter. Therefore, the injection amount of the drug solution is reduced,
Enables improved economic efficiency.

Further, since the structure can be simplified, the disassembly and assembly work can be facilitated.

[0021]

Embodiments of the present invention will be described below in detail with reference to the drawings.

(Embodiment 1) The injection inner tube 100 according to Embodiment 1 is used for a double tube double packer method. As shown in FIG. 1, the inner pipe main body 10, a sleeve assembly 130 having an ejection hole 131 b, and an upper packer assembly 110 and a lower packer assembly 120 connected vertically above and below the sleeve assembly 130 in the axial direction. I have. FIG. 1 shows only a half of the inner tube 100 as a cross section.
Arrows in the figure indicate the flow of the chemical solution.

The inner tube body 10 is a hollow flexible tube extending to the ground. The base end of the inner tube main body 10 on the ground side is connected to a press-fitting device for a chemical solution, and the front end is connected to the upper packer assembly 110.

The upper packer assembly 110 includes an upper packer pipe 111 serving as a base, packer nipples 112 respectively attached to upper and lower ends thereof, a packer cap 113 attached outside each packer nipple 112, and a packer nipple 112. And a packer rubber 114 fixed to the packer cap 113.

The upper packer pipe 111 is a steel tubular body in which an upper chemical liquid passage 111a penetrating in the axial direction is formed. A spanner hook 111b is formed on an outer surface of the upper part in the installed state. A joint portion 111c is formed at the upper end. A male screw is cut into the joint portion 111c, and the joint portion 111c is screwed with a female screw cut at the tip of the inner tube main body 10.

The packer nipple 112 is, as shown in FIG. 2, a substantially cylindrical body made of steel having a wrench hook 112a formed at one end. The tubular parts face each other when attached to the upper packer pipe 111. ing. The inner diameter of the packer nipple 112 is equal to the outer diameter of the upper packer pipe 111, and is fitted to the outer surface of the upper packer pipe 111. Spanner hook 112a on the outer surface of the cylindrical part
The flange 112b is formed at a slight interval from the flange 112b. With this flange 112b, a spanner hook 112a
A groove 112c is formed between the two. The flange 113a of the packer cap 113 is fitted in such a groove 112c.

The packer cap 113 is a substantially cylindrical body made of steel with the above-mentioned flange 113a formed at one end thereof toward the inside in the radial direction. The packer cap 113 is attached to the packer nipple 112 with the flanges 113a facing in opposite directions. Installed. The inner diameter is larger than the outer diameter of the packer nipple 112, and a cylindrical gap is formed in the mounted state. The both ends of the packer rubber 114 are fixed by being sandwiched in this gap.

The packer rubber 114 is a straight cylindrical body which can expand and contract.

A sleeve assembly 130 is connected to a lower end of the upper packer assembly 110.

The sleeve assembly 130 includes a sleeve pipe 131, a sleeve rubber 132 attached to the outer periphery of the sleeve pipe 131, and a joint 133 for connecting to the lower packer assembly 120.

The sleeve pipe 131 is a steel tubular body in which a middle chemical liquid passage 131a penetrating in the axial direction is formed. An ejection hole 131b, which communicates with the middle chemical liquid flow path 131a and jets a chemical liquid, is opened at a substantially central side in the axial direction. As shown in FIG. 1, the ejection hole 131b is a small hole in the vicinity of the inner surface, and is enlarged in the vicinity of the outer surface to form a T-shaped vertical section. At the upper part, a joint part 131c having a spanner hook formed on the outer surface is formed. A female screw is cut inside the joint,
It is screwed into a male screw cut at the lower end of the upper packer pipe 111.

The sleeve rubber 132 is a rubber cylindrical body whose inner diameter is smaller than the outer diameter of the sleeve pipe 131. The sleeve rubber 132 is formed so that a chemical solution can be ejected from the outer surface of the sleeve pipe 131. Fitted on the outside surface.

The joint 133 is a cylindrical body whose inner surfaces at both ends are internally threaded. It penetrates in the axial direction, and the upper chemical liquid flow path 131 a and the lower chemical liquid flow path 12
0a. Internal threads are cut on the inner peripheral surfaces at both upper and lower ends. Sleeve pipe 1 for female screw at upper end
The lower packer pipe constituting the lower packer assembly 120 is screwed to a female screw at the lower end.

The lower packer assembly 120 has substantially the same structure as the upper packer assembly 110. However, the lower end of the lower packer pipe is closed, and a lower chemical liquid flow path 120a is formed inside. Also,
A tip cap 121 is screwed to the outer surface of the lower end. In the figure, the same components as those of the upper packer assembly 110 are denoted by the same reference numerals.

In the drawings, reference numerals 150 to 154 denote O-rings for sealing a chemical solution.

As shown in FIG. 1, the upper packer pipe 11
In a state where the first chemical solution passage 1, the sleeve pipe 131, and the lower packer pipe are connected, a chemical solution injection channel 140 is formed by the upper chemical solution channel 111a, the middle chemical solution channel 131a, and the lower chemical solution channel 120a.

Next, a construction method will be described.

After drilling the ground with a casing, the outer pipe for injection 1 shown in FIG. 3 is built in the casing.

Next, the injection inner tube 10 with a double packer
0 is inserted into the outer tube 1 for injection.

Next, the inner injection tube 100 is moved in the axial direction so that the ejection hole 131b of the inner injection tube 100 coincides with the deepest injection hole 2 of the outer injection tube 1.

Next, the chemical is pumped from the ground into the chemical injection channel 140 to expand the packer rubbers 114 and 114, and the chemical M is injected into the ground G through the injection hole 2.

Next, the injection hole 131b is aligned with the injection hole immediately above by moving the injection inner tube 100 upward,
The chemical M is injected into the ground G from the injection hole.

This process is sequentially performed up to the uppermost injection hole, and the chemical solution M is injected into the ground G from each injection hole.

Next, the operation of the inner tube 100 will be described.

The chemical liquid injection flow path 140 through the inner pipe main body 10
When the chemical solution is press-fitted into the upper packer assembly 110 and the lower packer rubber 114 as shown in FIG.
Is inflated, and both packer rubbers 114 are brought into contact with the inner surface of the outer injection tube 1 to close the gap between the outer injection tube 1 and the inner injection tube 100.

Further, the press-fitted chemical solution is supplied to the middle chemical solution flow path 1.
31a flows into the ejection hole 131b, and the sleeve rubber 13
2 and from the outer surface of the sleeve pipe 131. If the elasticity of the sleeve rubber 132 is set to be greater than the elasticity of the two rubbers 114, the closing by the two rubbers 114 can be completed.

When the press-in of the chemical is stopped, the upper packer and the lower packer contract due to the contraction force of the upper packer and the lower packer, and the ejection of the chemical from the sleeve rubber 132 also stops.

By such an operation, it is possible to inject the chemical from the deepest injection hole to the shallowest injection hole.

Next, the effect of the injection inner tube 100 will be described.

Since the inner pipe used for the double pipe double packer method can be expanded and contracted, the labor required for inserting and lifting the inner pipe 100 can be reduced. Further, even if the outer injection tube 1 is bent, it can be inserted.

Further, since there is no need to provide a flow path for pressurizing the packer separately from the chemical liquid injection flow path 140, the injection inner pipe 10
0 can be simplified. Therefore, it is possible to cope with the small-diameter outer injection tube 1. As a result, it is possible to reduce the hole diameter of the inner injection pipe 100 and the outer injection pipe 1, reduce the injection amount of the chemical solution, and reduce the construction cost.

Further, since the structure can be simplified, the manufacturing cost of the injection inner tube 100 can be reduced. Also,
Assembly, disassembly, cleaning, and the like can be easily performed. As a result, the construction period can be shortened, and the construction cost can be reduced.

Further, since the packer can be expanded by the chemical solution, a fluid for expanding the packer and a pressurizing device for pressurizing the fluid are not required. Therefore,
It is possible to reduce the cost and running cost of the whole liquid injector including the pressurizing device and the like installed on the ground, thereby reducing the construction cost .............

Further, the injection of the chemical and the packing rubber 11
4 can be performed simultaneously, so that the construction time can be shortened.

(Embodiment 2) As shown in FIG. 4, an injection inner tube 200 according to Embodiment 2 includes an inner tube main body 10, a sleeve assembly 220 having an ejection hole 221b, and
It is roughly composed of an upper packer assembly 210 and a lower packer assembly 240 which are connected vertically in the axial direction of the sleeve assembly 220, and has substantially the same configuration as that of the first embodiment. However, in the first embodiment, the packer rubber of the upper packer assembly and the packer rubber of the lower packer assembly have a structure in which they are expanded by a chemical solution. In contrast, in the second embodiment, the lower packer assembly 240 Is expanded by the oil O. The arrows in the figure indicate the flow of the chemical.

The upper packer assembly 210 has a pair of packer nipples 211 located at both upper and lower ends thereof,
A packer cap 212 attached to the outside of each packer nipple 211, and an upper packer rubber 2 fixed to the packer nipple 211 and the packer cap 212
13 is provided.

As shown in FIG. 5, the packer nipple 211 is a nipple having a spanner hook 211a formed at the center and having the same inner diameter in any longitudinal section. An external thread 211b is formed at one end, and a flange 211c is formed at a slight distance from the external thread 211b. With this flange 211c, a spanner hook 211a
A groove 211d is formed between the two. The flange 212a of the packer cap 212 is fitted into the groove 211d.

The packer nipple 211 is attached to the packer cap 212 with the flanges 212a facing in opposite directions.
It is a substantially cylindrical body made of steel attached to the. Tsuba 212a
Is formed at one end toward the inside in the radial direction. A female screw 212b is cut on the inner peripheral surface. The inner diameter is larger than the outer diameter of the packer nipple 211, and a cylindrical gap is formed between the male screw 211 b and the female screw 212 b of the packer nipple 211 when attached to the packer nipple 211. Both ends of the upper packer rubber 213 are fixed by being screwed into this gap.

As shown in FIG. 4, the upper packer rubber 213 is a straight cylindrical body which can be expanded and contracted. The pair of packer nipples 211 is formed by the upper packer rubber 213.
Is connected.

An upper chemical liquid passage 214 is formed inside the packer nipple 211 and the upper packer rubber 213.

The sleeve assembly 220 is connected to the lower end of the upper packer assembly 210 via the connector 215.
Is connected.

The sleeve assembly 220 includes a sleeve pipe 221 and a sleeve rubber 222 attached to the outer periphery of the sleeve pipe 221.

The sleeve pipe 221 is a steel tubular body in which a middle chemical liquid flow path 221a penetrating in the axial direction is formed. An ejection hole 221b for ejecting a chemical solution, which communicates with the middle chemical solution flow path 221a, is opened at a substantially central side in the axial direction. The ejection hole 221b is a small hole near the inner side surface, has a larger diameter near the outer side surface, and has a T-shaped vertical cross section as shown in FIG. At the upper part, a joint part 221d having a spanner hook 221c formed on an outer surface thereof
Are formed. A female screw is cut inside the joint portion 221d, and is screwed to a male screw cut at the lower end of the upper packer nipple 211.

The sleeve rubber 222 is a rubber cylindrical body whose inner diameter is smaller than the outer diameter of the sleeve pipe 221. The sleeve rubber 222 is formed so that a chemical solution can be ejected from the outer surface of the sleeve pipe 221. Fitted on the outside surface.

A lower packer assembly 240 is connected to a lower end of the sleeve pipe 221 via a lower plunger assembly 230.

The lower plunger assembly 230 includes a lower cylinder 231 and a lower plunger 232 into which the lower cylinder 231 is inserted.

The lower cylinder 231 is a steel cylindrical body, and has an air vent hole 231a at the lower part. Female threads are cut at both ends and a sleeve pipe 2
The lower end of 21 is screwed, and the lower end is screwed with an upper packer nipple 241.

The lower plunger 232 has an upper head 232a and a lower head 232b formed at both ends, and has a circular cross section. Upper head 232a
Slides in the lower cylinder 231. The inner diameter of the upper packer nipple 241 is smaller than that of the lower cylinder 231, and the lower head 232 b slides inside the upper packer nipple 241. Therefore, the diameter of the lower head 232b is smaller than the diameter of the upper head 232a. The lower head 232b is urged upward by a return spring 233 abutting on the lower surface thereof. The lower end of the return spring 233 is in contact with the tip cap 270. The diameter of the upper head 232a is
Since the diameter is larger than the diameter of the lower end of the sleeve pipe 221, the upper head 232 a
Is in contact with the lower end of the sleeve pipe 221.

The lower packer assembly 240 includes a pair of packer nipples 241, 242, a packer cap 243, and a lower packer rubber 244.

The upper packer nipple 241 is similar to the packer nipple 211 of the upper packer assembly 210. The lower packer nipple 242 is connected to the packer nipple 211 of the upper packer assembly 210.
Is similar to The lower end is closed by a tip cap 270.

The packer cap 243 and the lower packer rubber 244 are the same as the packer cap 212 and the upper packer rubber 213 of the upper packer assembly 210.

The lower end face of the lower head 232b, the upper packer nipple 241 and the lower packer nipple 242
234 surrounded by the lower packer rubber 244
Is filled with oil O. Therefore, when the lower plunger 232 is pushed down by the chemical, the lower packer rubber 244 is expanded by the oil O.

As described above, the upper packer assembly 2
10, the sleeve assembly 220 and the lower packer assembly 240 are connected to each other,
14 and a middle chemical liquid flow path 221 communicating with the ejection hole 221b.
a and the lower cylinder 231 so that the lower plunger 232 can be pressed, thereby forming a chemical solution injection channel 250 therein. In the figure, reference numerals 260, 261, 26
Reference numerals 2 and 263 denote O for sealing the chemical or oil O.
It is a ring.

The construction method is the same as in the first embodiment.

Next, the operation of the injection inner pipe used in the double pipe double packer method will be described.

As shown in FIG. 6, when the chemical is press-fitted into the chemical injection channel 250 through the inner pipe main body 10, the chemical flows into the upper packer rubber 213 to expand it, and the Make contact with the inner surface. Also, the chemical solution is in the upper head 2
32a is pressed, and the lower plunger 232 is pressed down.
At this time, the lower head 232b transmits the pressure to the oil O, causing the oil O to flow into the lower packer rubber 244,
It is expanded and brought into contact with the inner surface of the outer injection tube 1. As a result, a closed space is formed between the upper packing rubber 213 and the lower packing rubber 244.

On the other hand, the press-fitted chemical solution is supplied to the middle chemical solution flow path 2.
21a flows into the ejection hole 221b, and the sleeve rubber 22
2 is injected into the space from between the inner surface of the inner tube 2 and the outer surface of the injection inner tube 200.

The diameter of the upper head 232a is
Since it is larger than the diameter of 32b, the lower packer rubber 244 can be expanded with a small injection pressure of the chemical solution. A specific example of such an operation will be described with reference to a design example of the inventor.

D ₁ = 16 mm, D ₂ = 10 mm, A ₁ =
2.01 cm ² , A ₂ = 0.79 cm ² D ₁ : diameter of upper head 232 a, D ₂ : lower head 2
Diameter of 32b, A ₁ : area of upper head 232a,
A ₂ : Area of lower head 232b P ₁ : Rightward pressure applied to upper head 232a (chemical solution injection pressure) P ₂ : Leftward pressure applied to lower head 232b (pressure for expanding the packer rubber)

In consideration of the equilibrium state, from the principle of Pascal, P ₁ A ₁ = P ₂ A _{2 In} consideration of the reaction force of the return spring 233 and the sliding resistance, P ₁ A ₁ = P ₂ A ₂ + ( Reaction force of return spring 233 +
Sliding resistance)

[0081] _{Therefore, P 2 = (A 1 /} A 2) ( reaction force + sliding resistance of the return spring 233) P ₁ over / reaction force + sliding resistance of A ₂ = 2.54P ₁ over (return spring 233 ) / A ₂ .

Here, if P ₂ > P ₁ , the packer rubber can be expanded by a small injection pressure.

In the above equation, assuming that the right side is 2.54 P _1- (reaction force of return spring 233 + sliding resistance) / A ₂ = XP ₁ , if X> 1, then P ₂ > P ₁ Becomes

[0084] When the sliding resistance is constant, the spring constant of the return spring 233, (reaction force + sliding resistance of the return spring 233) 2.54P ₁ over _{/ A 2> 1P 1 1.54P 1} > ( return spring If the adjustment is made so that the reaction force of 233 + the sliding resistance) / A ₂ (1), P ₂ > P ₁ .

On the other hand, assuming that the plunger is movable, the reaction force of the return spring 233 must be greater than the sliding resistance (2). Therefore, if the spring constant of the return spring 233 is determined so as to satisfy the above equations (1) and (2), (P ₃ >)> P ₂ > P ₁ and it becomes movable. P ₃ is the actual injection pressure in consideration of the loss due to fluid resistance, friction and the like.

As described above, if the spring constant of the return spring 233 is determined, it is possible to sufficiently close the packer rubber.

When the press-fitting of the chemical is stopped, the upper packer rubber 213 and the lower packer rubber 244 are contracted by the upper packer rubber 213 and the lower packer rubber 244.
4 shrinks, while the ejection of the chemical solution from the sleeve rubber 222 also stops.

The biased return spring 23
3, the lower plunger 232 is returned to the position before the injection of the chemical.

With this operation, it is possible to inject the chemical from the deepest injection hole to the shallowest injection hole.

The inner pipe 200 according to the second embodiment is different from the inner pipe according to the first embodiment in that the lower plunger 23
Although the structure is slightly complicated in that the second embodiment is used, the effects described in the first embodiment can be obtained since the single tube is used.

Further, the injection inner tube 20 according to the second embodiment
In the case of 0, the packer rubber of the lower packer assembly 240 is expanded by the oil O, so that a failure due to solidification of the chemical does not occur. Therefore, the disassembly and assembly work of the lower packer assembly 240 can be eliminated.

(Embodiment 3) As shown in FIG. 7, an injection inner tube 300 according to Embodiment 3 has an inner tube main body 10, a sleeve assembly 330 having an ejection hole 332, and a shaft of this sleeve assembly 330. The upper packer assembly 310 and the lower packer assembly 340, which are connected in the vertical direction, have a configuration substantially similar to that of the first embodiment. Embodiment 1 has a structure in which the upper packer rubber and the lower packer rubber are expanded with a chemical. On the other hand, in the third embodiment, the upper packer rubber 314 is expanded by oil O. The arrows in the figure indicate the flow of the chemical.

The upper packer assembly 310 is connected to the inner pipe main body 10 via the upper plunger assembly 320.
Is connected to

The upper plunger assembly 320 includes an upper cylinder 321 and an upper plunger 322 inserted into the upper cylinder 321.

The upper cylinder 321 is a substantially cylindrical body made of steel, is internally threaded at both ends, an adapter 301 is screwed at the upper end, and an upper packer nipple 311 is screwed at the lower end. ing.

The upper plunger 322 has a short tubular shape as shown in FIGS. As shown in FIG. 8, a thin portion 322a having a small outer diameter is formed at an upper portion, and a thin portion 322b is formed at a boundary with other portions. It is urged upward by a return spring 323 that contacts the lower surface. As shown in FIG. 7, the lower end of the return spring 323 is in contact with the upper end surface of the upper packer nipple 311. When no pressure is applied to the chemical solution, the thin portion 322a is connected to the adapter 301 as shown in FIG.
(Not shown in FIG. 8) and a gap between a lower end of a flow path pipe 325 to be described later,
1 comes into contact with the lower end surface.

The upper packer assembly 310 is substantially the same as the lower packer assembly according to the second embodiment except that the lower end is not closed by the tip cap. However, as shown in FIG. 7, the upper packer nipple 311 has a thinner external thread than the lower wall of the lower packer nipple 312. Therefore, an oil passage 313 shown in FIG. 11 is formed between the oil passage 313 and the passage pipe 325 described below.

As shown in FIG. 7, the flow pipe 325 is
The upper chemical liquid flow path 326 is formed by a straight steel pipe. Upper plunger 322 and lower packer nipple 3
12. Therefore, the upper plunger 3
22 slides in the gap between the upper cylinder 321 and the flow path pipe 325. Further, an oil O to be described later is provided between the lower packer nipple 312 and the flow pipe 325.
Is not leaked. As shown in FIG. 10, a cylindrical space equal to the thickness of the upper plunger 322 is formed between the upper plunger 321 and the inner surface thereof. A space is also formed between the upper packing rubber 314 and the upper packing rubber 314. Both spaces communicate with each other via an oil flow path 313.

Oil O is sealed in both spaces and the oil flow path 313. Therefore, the upper plunger 32
When 2 is pushed down by the chemical, the upper packer rubber 314 is expanded by the oil O.

The sleeve assembly 330 has the same configuration as the sleeve assembly according to the second embodiment.

The lower packer assembly 340 has the same configuration as the lower packer assembly according to the second embodiment. However, no oil is sealed inside and no return spring is inserted. The inside is a lower chemical liquid flow path 341. In the drawing, reference numeral 342 denotes a lower packer rubber.

As described above, the upper packer assembly 3
10, the sleeve assembly 330, and the lower packer assembly 340 are connected, the upper cylinder 321 capable of pressing the upper plunger 322, the upper chemical liquid flow path 326, the middle chemical liquid flow path 331, and the lower chemical liquid flow path 34
By this, the chemical solution injection channel 350 is formed inside.

In the figure, reference numerals 360 to 364 denote O-rings for sealing a chemical or oil O.

The construction method is the same as in the first embodiment.

Next, the operation of the injection inner pipe used in the double pipe double packer method will be described.

As shown in FIG. 12, when a chemical is press-fitted into the chemical injection flow path 350 via the inner pipe main body 10, the chemical M flows into the lower packer rubber 342 to expand it, and the injection outer pipe 1 Abut the inner surface of the Further, the chemical solution M pushes down the upper plunger 322. At this time, the pressure is transmitted to the oil O, and the oil O is caused to flow into the upper packer rubber 314, expanded, and brought into contact with the inner surface of the outer filling tube 1. As a result, a closed space is formed between the upper packer rubber 314 and the lower packer rubber 342.

On the other hand, the press-fitted chemical liquid flows into the ejection hole and is ejected into the space from between the inner surface of the sleeve and the outer surface of the injection inner tube 300.

Further, when the injection of the chemical solution M is continued, the chemical solution M is injected into the ground G through the injection hole 2.

Since the inner injection tube 300 according to the third embodiment is configured as described above, the same effect as the inner injection tube according to the second embodiment can be obtained.

(Embodiment 4) As shown in FIG. 13, an injection inner tube 400 according to Embodiment 4 comprises an inner tube main body 10 and
A sleeve assembly 400 having an ejection hole 431;
It is roughly composed of an upper packer assembly 410 and a lower packer assembly 430 connected vertically in the axial direction of the sleeve assembly, and has substantially the same configuration as that of the first embodiment. However, Embodiment 1 has a structure in which the upper packer rubber and the lower packer rubber are expanded by a chemical. On the other hand, in the fourth embodiment, the upper packer rubber 411 and the lower packer rubber 441 are expanded with oil O. The arrows in the figure indicate the flow of the chemical.

The upper packer assembly 410 and the upper plunger assembly 420 connected thereto have the same configuration as the upper packer assembly and the plunger assembly according to the third embodiment.

The sleeve assembly 430 has the same configuration as the sleeve assembly according to the first embodiment.

The lower packer assembly 440 and the lower plunger assembly 450 connected to it have the same configuration as the lower packer assembly and the plunger assembly according to the second embodiment.

FIG. 14 shows the operation of the inner injection tube 400 configured as described above. This operation is also described in Embodiments 1 to 3.
Is the same as the above operation.

Further, the same effects as those described in the first to third embodiments can be obtained.

The number, position, shape, and the like of the above-mentioned constituent members are not limited to those of the first to fourth embodiments. ,
It can be shaped and the like.

Further, as the chemical solution, for example, cement milk or the like, which is suitable for carrying out the present invention, can be used.

Further, as the method of fixing the packer rubber, a method of fixing by sandwiching as shown in FIG. 1 and a method of screwing as shown in FIGS. 3 to 6 are preferable in the present invention. The packer rubber can be fixed by the method.

The number of return springs, wire diameter, etc.
It can be made suitable for carrying out the present invention.
Further, it is not necessary to provide a return spring.

In each of the drawings, the same components are denoted by the same reference numerals.

[0121]

Since the present invention is configured as described above, the following effects can be obtained. Since the packer for the infusion tube according to the present invention can be expanded and contracted, the labor required for the insertion and lifting operations of the infusion tube can be reduced. Further, even if the outer injection tube is bent, it can be inserted.
In addition, since it is not a double pipe structure, it is possible to reduce the diameter. Therefore, the hole diameter can be reduced and the injection amount of the chemical solution can be reduced, so that the economic efficiency can be improved. Further, since the structure can be simplified, the disassembling and assembling work can be facilitated. The labor required for the insertion and withdrawal operations of the inner injection tube can be reduced, and the insertion can be performed even if the outer injection tube is bent.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional side view of an inner injection tube according to Embodiment 1.

FIG. 2 is an enlarged view of a packer nipple in a connected state.

FIG. 3 is a partial cross-sectional side view showing the operation of the infusion tube according to the first embodiment.

FIG. 4 is a partial cross-sectional side view of an inner injection tube according to a second embodiment.

FIG. 5 is an enlarged view of a packer nipple in a connected state.

FIG. 6 is a partial cross-sectional side view showing the operation of the infusion tube according to the second embodiment.

FIG. 7 is a partial cross-sectional side view of an inner injection tube according to a third embodiment.

FIG. 8 is an enlarged view of the packer nipple in a connected state.

FIG. 9 is a sectional view taken along line S1-S1 of FIG. 7;

FIG. 10 is a sectional view taken along line S1-S1 of FIG. 7;

11 is a sectional view taken along line S1-S1 of FIG.

FIG. 12 is a partial cross-sectional side view showing the operation of the infusion tube according to the third embodiment.

FIG. 13 is a partial cross-sectional side view of an inner injection tube according to Embodiment 4.

FIG. 14 is a partial cross-sectional side view showing the operation of the infusion tube according to the fourth embodiment.

[Explanation of symbols]

 G Ground M Chemical O Oil 1 Injection Outer Pipe 2 Injection Hole 10 Inner Pipe Main Body 100 Injection Inner Pipe 110 Upper Packer Assembly 111 Upper Packer Pipe 111a Upper Chemical Flow Path 111b Spanner Hanging 111c Joint Part 112 Packer Nipple 112a Spanner Hook 112b Flange 112c Groove 113 Packer cap 113a Collar 114 Packer rubber 120 Lower packer assembly 120a Lower chemical liquid flow path 121 Tip cap 130 Sleeve assembly 131 Sleeve pipe 131a Middle chemical liquid flow path 131b Spout hole 131c Joint section 132 Sleeve rubber 133 Joint 140 Chemical liquid injection flow path 150, 151 , 152, 153, 154 O-ring 200 Injection inner pipe 210 Upper packer assembly 211 Packer nip Pull 211a Spanner hook 211b Male screw 211c Flange 211d Groove 212 Packer cap 212a Flange 212b Female screw 213 Upper packer rubber 214 Upper chemical liquid flow path 215 Connector 220 Sleeve assembly 221 Sleeve pipe 221a Middle chemical liquid flow path 221b Spout hole 221c Sleeve joint 221d Rubber 230 Lower plunger assembly 231 Lower cylinder 231a Air vent hole 232 Lower plunger 232a Upper head 232b Lower head 233 Return spring 234 Space 240 Lower packer assembly 241 Upper packer nipple 242 Lower packer nipple 243 Packer cap 244 Lower chemical liquid rubber 250 Channels 260, 261, 2 2,263 O-ring 270 Tip cap 300 Injection inner pipe 301 Adapter 310 Upper packer assembly 311 Upper packer nipple 312 Lower packer nipple 313 Oil flow path 314 Upper packer rubber 320 Upper plunger assembly 321 Upper cylinder 322 Upper plunger 322a Thin step 322b Part 323 Return spring 325 Flow pipe 326 Upper chemical flow path 330 Sleeve assembly 331 Middle chemical liquid flow path 332 Jet hole 340 Lower packer assembly 341 Lower chemical liquid flow path 342 Lower packer rubber 350 Chemical liquid injection flow path 360, 361, 362, 363, 364 O-ring 400 Injection inner tube 410 Upper packer assembly 411 Upper packer rubber 420 Upper plunger assembly 430 sleeve assembly 431 ejection holes 440 lower packer assembly 441 lower packer rubber 450 plunger assembly

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-48518 (JP, A) JP-A-50-138607 (JP, A) JP-A-55-142818 (JP, A) JP-A 52-14881 113506 (JP, A) Hira 3-36024 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) E02D 3/12

Claims (3)

(57) [Claims] 1. An exhaust hole provided at a tip end portion, and upper and lower expander rubbers and lower and lower packer rubbers respectively provided above and below the exhaust hole, and after the ground is drilled by a casing. Being built in the casing,
The injection hole is inserted into the injection outer tube having an injection hole at a predetermined interval in the axial direction, and is moved in the axial direction to match the ejection hole with the injection hole of the injection outer tube. An injection inner pipe used for the double pipe double packer method for injecting, a sleeve is provided on an outer surface of a portion where the ejection hole exists, so as to be able to eject the chemical solution from between the outer surface, A lower plunger is slidably fitted in a lower cylinder communicating with the inside of the lower packer rubber, and the lower packer rubber and the lower cylinder are moved so that the lower packer rubber expands and contracts by sliding of the lower plunger. Oil is sealed in a space surrounded by the above, and communicates with the inside of the upper packer rubber, the ejection hole, and the lower cylinder so as to be able to press the lower plunger. Wherein the Luo pumped been the chemical liquid chemical injection channel that circulates in the interior formed therein, infusion inner tube for use in double pipe double packer method. 2. A fuel cell system comprising: a spout hole provided at a tip portion; and upper and lower packer rubbers, which are provided above and below the spout hole, respectively, and are capable of expanding and contracting. Being built in the casing,
The injection hole is inserted into the injection outer tube having an injection hole at a predetermined interval in the axial direction, and is moved in the axial direction to match the ejection hole with the injection hole of the injection outer tube. Injecting, a double-pipe inner packing used for the double-packer method, a sleeve is provided on an outer surface of a portion where the ejection hole exists, so that the chemical solution can be ejected from between the outer surface, An upper plunger is slidably fitted in an upper cylinder communicating with the inside of the upper packer rubber, and the upper packer rubber and the upper cylinder are expanded and contracted by sliding of the upper plunger. Oil is sealed in a space surrounded by the above, and communicates with the inside of the lower packer rubber, the ejection hole, and the upper cylinder so as to be able to press the upper plunger, Wherein the Luo pumped been the chemical liquid chemical injection channel that circulates in the interior formed therein, infusion inner tube for use in double pipe double packer method. 3. An exhaust hole provided at a tip end portion, and upper and lower expandable rubbers and a lower packer rubber which are respectively provided above and below the exhaust hole. Being built in the casing,
The injection hole is inserted into the injection outer tube having an injection hole at a predetermined interval in the axial direction, and is moved in the axial direction to match the ejection hole with the injection hole of the injection outer tube. Injecting, a double-pipe inner packing used for the double-packer method, a sleeve is provided on an outer surface of a portion where the ejection hole exists, so that the chemical solution can be ejected from between the outer surface, An upper plunger is slidably fitted in an upper cylinder communicating with the inside of the upper packer rubber, and the upper packer rubber and the upper cylinder are expanded and contracted by sliding of the upper plunger. The lower plunger is slidably fitted in a lower cylinder communicating with the inside of the lower packer rubber, and the lower plunger is fitted therein. Oil is sealed in a space surrounded by the lower packer rubber and the lower cylinder so that the lower packer rubber expands and contracts due to sliding of the upper packer rubber, the ejection hole, and the upper plunger. The upper cylinder so as to be able to press,
A double-pipe double packer, characterized in that a chemical injection path is formed in the lower cylinder, which communicates with the lower cylinder so that the lower plunger can be pressed, and in which the medical liquid pumped from the ground flows inside. Inner tube used for the construction method.