JP2002180775A - Packer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packer having a simple structure and being difficult to damage. SOLUTION: A cylindrical expanding body 43 expansible by working fluid pressure is fitted on the outer circumferential side of a liquid-passing cylindrical body 42, into which a liquefied substance can be passed, and both end sections of the expanding body 43 are clamped and fixed to the liquid-passing cylindrical body 42 by clamps 44. Reinforced fibers 48 are mounted into the expanding body 43. An inner tube 45 is inserted into the internal space section of the liquid-passing cylindrical body 42, and a section between the cylindrical body 42 and the expanding body 43 is supplied with working fluid pressure from the inner tube 45 to expand the expanding body 43. The expanding body 43 is stuck fast onto the interior wall of a boring-excavated excavated pit, and the inside of the excavated pit is partitioned and sealed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packer provided with an inflatable body which can be inflated by a working fluid pressure.

[0002]

2. Description of the Related Art As shown in FIG. 7, a packer inserted through a pipe 12 into a borehole 11 formed by drilling.
13 expands as shown in the drawing by air pressure or water pressure supplied by a hose 14 disposed outside the pipe 12, closely adheres to the inner wall of the hole 11, and maintains the hole 11 even in the collapsed soft formation. Meanwhile, the inside of the hole 11 can be sealed.

A nozzle 15 is inserted into the lower hole space sealed from the upper hole space by the packer 13 through the pipe 12.
The grout 16 supplied to the tip of is supplied. It can be used for other purposes, such as injecting water and using it for a permeability test.

[0004] As shown in FIG.
A cylindrical rubber member 22 that can be expanded by pneumatic or hydraulic working fluid pressure is fitted on the outer peripheral side of the pipe member 21, and a connection fitting 23 fixed to the upper end of the rubber member 22
A connection fitting 26 fixed to the lower end of the rubber member 22 is screwed to a lower end member 28 via a ring 27, and the lower end member 28 is
Is slidably fitted to the pipe member 21 via the. Pipe member
The lower end of 21 is the nozzle 15.

Further, a gap between the pipe member 21 and the rubber member 22 is communicated through a hole 31 formed in the upper end member 25 with a nipple 32 screwed into the upper surface of the upper end member 25.
The hose 14 is connected to 32.

When the working fluid pressure is supplied from the hose 14 to the gap between the pipe member 21 and the rubber member 22, the rubber member 22 expands as shown in FIG. At that time, the lower end member
28 moves upward.

[0007]

As described above, since the conventional packer 13 receives the supply of the working fluid pressure from the hose 14 provided outside, the passage of the working fluid pressure from the nipple 32 to the inside of the rubber member 22 is provided. Inevitably, the structure must be complicated.

Further, if the hose 14 drawn out from the packer 13 gets caught on an external obstacle, it may be damaged.

In some cases, a plurality of packers 13 are connected in series in correspondence with a plurality of strata. In such a case, the holes 31 and the nipples 32 of the upper end member 25 are also provided in the lower end member 28. A hole and a nipple similar to those described above must be provided so that the lower nipple of the upper packer and the upper nipple of the lower packer must be sequentially connected by a hose. Therefore, it is not possible to make individual adjustments for each packer according to the hardness of the formation.

As described above, since a uniform working fluid pressure is supplied to a plurality of packers, the collapsed soft stratum may be destroyed, causing problems such as inability to seal and inability to insert a measuring instrument.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a packer which has a simple structure and is hard to be damaged, and further provides a packer which can perform a plurality of individual adjustments. It is intended for.

[0012]

According to the first aspect of the present invention, there is provided a fluid passage cylinder through which a liquid material can pass, and an inflatable cylinder which is fitted on an outer peripheral side of the fluid passage cylinder and can be expanded by a working fluid pressure. Cylindrical inflatable body, a fastener for tightening and fixing both ends of the inflatable body to the liquid cylinder, and between the liquid passage cylinder and the inflatable body inserted into the inner space of the liquid passage cylinder. An inner pipe for supplying a working fluid pressure to expand the expansion body, and the inner pipe is used to tighten and fix both ends of the expansion body to the liquid cylindrical body with a fastener.
Since the structure is simple and easy to manufacture, and since the inner tube for supplying the working fluid pressure between the liquid passage cylinder and the expansion body to expand the expansion body is inserted into the inner space of the liquid cylinder, There is no danger of the inner pipe getting caught in an external obstacle and it is hard to break.

According to a second aspect of the present invention, in the packer according to the first aspect, the inflatable body is a cylindrical rubber body having reinforcing fibers provided therein. Since the reinforcing fibers can withstand the high working fluid pressure that cannot be tolerated by the reinforcing fiber, the sealing material can be more reliably sealed by contacting the hard stratum with a high pressure.

According to a third aspect of the present invention, there is provided the packer according to the first or second aspect, wherein the outer diameter of the expander when no pressure is applied is formed to be equal to or less than the outer diameter of the fastener. As a result, there is a margin in the expansion allowance when the expandable body is expanded by receiving the supply of the working fluid pressure, and the corner portion located on the outer diameter side of the end of the fastener is prevented from biting into the expandable body. And prevent the expansion body from being damaged.

According to a fourth aspect of the present invention, there is provided the packer according to any one of the first to third aspects, wherein the clamp has an arc-shaped cross section at an end facing the enlarged diameter portion of the expansion body. With this configuration, when the expanding body expands its diameter by receiving the supply of the working fluid pressure, even if the expanding body comes into contact with the end of the clamp, the arcuate cross section of the end prevents the expansion body from being damaged. .

According to a fifth aspect of the present invention, there is provided the packer according to any one of the first to fourth aspects, wherein the fastener is provided on the inner peripheral surface of the end portion facing the enlarged diameter portion of the inflatable body. With this, a margin is provided for a swelling allowance when the expandable body is expanded by receiving the supply of the working fluid pressure, and an expandable body at a corner located on the inner diameter side of the end of the clamp is provided. Relieves intrusion into the body and prevents damage to the inflatable body.

According to a sixth aspect of the present invention, in the packer according to any one of the first to fifth aspects, a plurality of fluid passage cylinders are connected in series, and inner pipes are individually provided in the respective fluid passage cylinders. Connected, so that the supply of working fluid pressure can be selected or adjusted for each of a plurality of packers by a plurality of inner pipes, and a plurality of packers can be selectively expanded according to use or non-use, By individually adjusting the working fluid pressure in accordance with the hardness of the ground, the collapse of the collapsed soft stratum is prevented.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 4, another embodiment will be described with reference to FIG. 5, and a usage example will be described with reference to FIG. I will explain it.

FIG. 1 shows a fixed end packer 41, which includes a liquid passing cylinder 42 through which a liquid material can pass.
A cylindrical inflatable body 43 fitted on the outer peripheral side of the liquid passing cylinder 42 and expandable by a working fluid pressure;
And a working fluid pressure supplied between the liquid passing cylinder 42 and the expansion body 43 inserted into the inner space of the liquid passing cylinder 42 to expand the expansion body 43. A tube 45 is provided.

The liquid passage cylinder 42 has a large number of locking grooves 46 formed on the outer peripheral surfaces of the upper and lower portions in which the expander 43 is fitted so as to prevent relative expansion of the expander 43 in the axial direction. , And also an inflatable body
Screw grooves 47 for pipe connection are formed on the outer peripheral surfaces of the upper and lower ends protruding from 43.

The inflatable body 43 is a cylindrical rubber body having reinforcing fibers 48 provided therein. The reinforcing fibers 48 are made of chemical fibers or the like, and a reinforcing layer is arranged only in the vertical direction to form a rubber bulge. And a structure that effectively acts on peeling of the reinforcing layer.

The fastening fitting 44 is a sleeve-shaped fitting that is swaged to fix the inflatable body 43 to the liquid cylinder 42 and has an outer diameter larger than the outer diameter of the inflatable body 43 when there is no pressure. It has a special shape so as not to damage the expansion body 43 against the expansion of the expansion body 43, and there is room for pressure resistance and expansion allowance. This will be described in detail later.

The inner pipe 45 is a pipe including a metal pipe and a hose for supplying a working fluid pressure such as a pneumatic pressure or a hydraulic pressure. It is welded to the passage cylinder 42. A pipe joint 49 is provided at an upper end of the inner pipe 45, and a pipe (not shown) for supplying a working fluid pressure from the ground is connected via the pipe joint 49.

As shown in FIG. 2, the outer diameter of the expansion body 43 at the time of no pressure is formed to be equal to or less than the outer diameter of the clamp 44,
A step 51 is set, and as shown in FIG.
The outer diameter of the pressurized 43 is larger than the outer diameter of the clamp 44,
The protrusion amount 52 is ensured, but the outer diameter of the expansion body 43 when there is no pressure is
Since the outer diameter of the clamp 44 is equal to or smaller than the outer diameter of the inflatable body 43, a margin is provided for the inflatable body 43 when the inflatable body 43 is expanded by receiving the supply of the working fluid pressure. It is possible to prevent the corner portion 54 located on the outer diameter side of the end portion 53 facing the enlarged diameter portion 43 from biting into the inflatable body 43 and prevent the inflatable body 43 from being damaged.

As shown in FIGS. 2 to 4, the fastening member 44 includes an outer diameter side corner portion 54 and an inner diameter side corner portion 55 of the end portion 53 facing the enlarged diameter portion of the expansion body 43. Is formed in an arc-shaped cross section, whereby, when the expanding body 43 expands its diameter by receiving the supply of the working fluid pressure, even if the expanding body 43 comes into contact with the end 53 of the clamp 44, The arcuate cross section of the corners 54 and 55 of the end 53 can prevent the expansion body 43 from being damaged.

Further, as shown in FIG.
A concave groove 56 for preventing the expansion body 43 from slipping is formed on an inner peripheral surface of the expansion body 43, and an inner peripheral surface of an end 53 of the fastener 44 facing the enlarged diameter portion of the expansion body 43. And a clearance allowance groove 57 serving as a clearance allowance for the expansion body 43 when the fastening fitting 44 is swaged. As a result, there is a margin in the expansion allowance when the expansion body 43 expands its diameter by receiving the supply of the working fluid pressure, and the end portion 53 of the clamp 44 is provided.
Of the corner 55 located on the inner diameter side of the inflatable body 43 can be reduced, and the inflatable body 43 can be prevented from being damaged.

FIG. 5 shows another embodiment, in which a packer 41a is provided with screw grooves 47 formed at both ends of a liquid passing cylinder 42.
The connecting cylinder 59 is screwed via a ring 58, and the other structure and operation are the same as those of the packer 41 shown in FIG.

FIG. 6 shows a borehole 61 that has been drilled.
A plurality of packers 41 shown in FIG. 1 are connected in series via pipes 62 screwed to the liquid passing cylinders 42, and individually inserted into the liquid passing cylinders 42, respectively. This is a usage example in which the working fluid pressure is individually supplied to the inside of each expansion body 43 via the connected inner pipes 45 and the pipes 63 connected to these inner pipes 45.

Next, the operation of these embodiments will be described.

As shown in FIG. 6, the packing is carried out through a pipe 62 to a predetermined depth of a borehole 61 which has been bored.
After fixing the installation level by inserting 41, the space between the liquid passing cylinder 42 and the expansion body 43 is passed through the pipe 62 and the inner pipe 45 and the pipe 63 disposed inside the liquid passing cylinder 42. By supplying the working fluid pressure of pressure or water pressure, the expansion body 43 expands and expands in diameter as shown in FIGS. 2 and 3, and is brought into close contact with the inner wall of the borehole 61. Thereby, the excavation hole 43 is maintained by the inflatable body 43 while maintaining the excavation hole 61 even in the collapsed soft stratum.
61 can be section sealed.

A hole is formed in the pipe 62, and grout or the like is spouted from this hole to form each of the packers 41.
To selectively inject grout etc. into the space inside the excavation hole that is sectioned and sealed, or to detect and collect the pressure and flow rate of groundwater, and to be able to individually extract as needed To

In such a packer 41, both ends of the expansion body 43 are fastened and fixed to the liquid cylinder 42 by the fastening fittings 44.
The structure is simple and easy to manufacture.
Since the inner pipe 45 for supplying the working fluid pressure between the expansion body 43 and expanding the expansion body 43 is inserted into the inner space of the liquid cylinder 42,
There is no fear that the inner tube 45 is caught by an external obstacle, and the inner tube 45 is hardly damaged.

Further, since the expansion body 43 can withstand the high working fluid pressure which the rubber body alone cannot withstand by the reinforcing fiber 48, the expansion body 43 comes into contact with a hard ground layer at a high pressure and can be sealed more reliably.

Further, as described above, when the inflatable body 43 expands its diameter by receiving the supply of the working fluid pressure, the clamp 44
Even if the inflatable body 43 comes into contact with the end 53 of the
The arcuate cross sections of 54 and 55 can prevent the expansion body 43 from being damaged.
Also, by setting the step 51 and forming the escape allowance groove 57,
When the expansion body 43 expands its diameter by receiving the supply of the working fluid pressure, there is a margin in the expansion allowance, and the expansion bodies of the corners 54 and 55 located on the outer diameter side and the inner diameter side of the end 53 of the clamp 44. The bite to the inflatable body 43 can be reduced and damage to the inflatable body 43 can be prevented.

In addition, as shown in FIG. 6, when a plurality of packers 41 connected to a drilled hole 61 that has been drilled are inserted, a plurality of inner pipes 45 and pipes 63 are used for each packer. It is possible to select or adjust the supply of working fluid pressure for each 41, use multiple packers 41, selectively expand according to non-use, and adjust working fluid pressure individually according to hardness of the formation etc. Thus, destruction of the collapsible soft stratum can be prevented.

Lastly, the upper end and the lower end of the inflatable body 43 are fixed to the liquid passage cylinder 42 by the clamps 44, so that the axial displacement of the inflatable body 43 when the inflated and expanded diameter of the inflatable body 43 is increased. No, even if multiple packers 41 are connected in multiple
Accurate positioning within 61

[0037]

According to the first aspect of the present invention, both ends of the expansion body are fastened and fixed to the liquid cylinder by the fastening fitting.
Since the structure is simple and easy to manufacture, and since the inner tube for supplying the working fluid pressure between the liquid passage cylinder and the expansion body to expand the expansion body is inserted into the inner space of the liquid cylinder, There is no danger of the inner tube being caught by an external obstacle, and damage can be prevented.

According to the second aspect of the present invention, the expansion body is
Since the reinforcing fibers can withstand the high working fluid pressure that cannot be tolerated by the rubber body alone, the reinforcing fiber comes into contact with a hard ground layer or the like at a high pressure, and more reliable sealing can be performed.

According to the third aspect of the present invention, there is a margin in the expansion allowance when the expander expands its diameter by receiving the supply of the working fluid pressure, and the corner located on the outer diameter side of the end of the clamp is provided. It is possible to prevent the portion from biting into the inflatable body and prevent the inflatable body from being damaged.

According to the fourth aspect of the present invention, when the expanding body expands its diameter by receiving the supply of the working fluid pressure, even if the expanding body comes into contact with the end of the clamp, the arcuate section of the end is used. This can prevent the expansion body from being damaged.

According to the fifth aspect of the present invention, there is a margin in the amount of expansion when the expanding body expands its diameter by receiving the supply of the working fluid pressure, and the corner located on the inner diameter side of the end of the clamp is provided. Of the inflatable body can be reduced, and the inflatable body can be prevented from being damaged.

According to the present invention, the supply of the working fluid pressure can be selected or adjusted for each of the plurality of packers by the plurality of inner tubes, and the plurality of packers can be selectively expanded according to use or non-use. Also, by individually adjusting the working fluid pressure according to the hardness of the formation, etc., it is possible to prevent the destruction of the collapsed soft formation.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a packer according to the present invention.

FIG. 2A is a front view of the same packer when there is no pressure,
(B) is an enlarged view showing a boundary portion between the expansion body and the fastening fitting at that time.

FIG. 3A is a front view of the same packer when pressurized,
(B) is an enlarged view showing a boundary portion between the expansion body and the fastening fitting at that time.

FIG. 4 is a sectional view showing a fastener in the packer.

FIG. 5 is a sectional view showing another embodiment of the packer according to the present invention.

FIG. 6 is an explanatory diagram showing an example of use of the packer according to the present invention.

FIG. 7 is an explanatory diagram showing an example of use of a conventional packer.

FIG. 8 is a sectional view showing a conventional packer.

[Explanation of symbols]

 41 Packer 42 Fluid cylinder 43 Inflatable body 44 Clamping fitting 45 Inner pipe 48 Reinforcement fiber 53 End 57 Relief allowance groove

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masaki Kawahara 2-9-5 Taito, Taito-ku, Tokyo Inside NLC Co., Ltd. (72) Inventor Takemi Ito 3-1-1 Higashi 3-chome, Komaki City, Aichi Prefecture Tokai Rubber Industries Co., Ltd. Inside the company (72) Inventor Shinichi Hosoya 2-272-3 Yoshino-cho, Omiya-shi, Saitama Prefecture Inside Dia-dia consultant (72) Inventor Mitsuhiko Nakata 2-272-3, Yoshino-cho, Omiya-shi, Saitama Diamond Co., Ltd. Inside the consultant

Claims (6)

[Claims] 1. A liquid passage cylinder through which a liquid material can pass, a cylindrical expansion body fitted on the outer peripheral side of the liquid passage cylinder and expandable by a working fluid pressure, and both ends of the expansion body. A clamp for tightening and fixing to the fluid passage cylinder; and an inner pipe inserted into the inner space of the fluid passage cylinder and supplying the working fluid pressure between the fluid passage cylinder and the expander to expand the expander. A packer comprising: 2. The packer according to claim 1, wherein the inflatable body is a cylindrical rubber body having reinforcing fibers provided therein. 3. The packer according to claim 1, wherein an outer diameter of the expansion body when no pressure is applied is formed to be equal to or less than an outer diameter of the fastener. 4. The fastener according to claim 1, wherein an end of the inflatable body facing the enlarged diameter portion has an arcuate cross section.
4. The packer according to any one of items 3 to 3. 5. The packer according to claim 1, wherein the fastening member has a relief groove for the inflatable body on an inner peripheral surface of an end of the inflatable body opposed to the enlarged diameter portion. 6. The packer according to claim 1, wherein a plurality of fluid passage cylinders are connected in series, and an inner pipe is individually connected to each fluid passage cylinder.