JPH0813468A - Sliding packer - Google Patents

Abstract

PURPOSE:To easily restore a sliding packer to the state before expansion even when an injection material has been charged to the nearby position of the end of downstream side of the packer. CONSTITUTION:A slide pipe 16 is fixed at the outer surface 12S of a metal fitting 12 of rubber at the downstream side, in a sliding packer 10. And a plug member 18 fixed to a pipe 3 for an injection material is arranged in the inside of the slide pipe 16. The plug member 18 and the inner wall face of slide pipe 16 can slide mutually and they are sealed against the injection material. A circular space 30 is constituted of the pipe 3 for the injection material, the metal fitting 12 of the downstream rubber, the plug member 18, and the slide pipe 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packer used for filling an injection material with a pipe for injection material to a predetermined depth of a drilling hole, and more particularly to a packer arranged at a predetermined position of the injection material pipe. A rubber packer that can be expanded and contracted by filling and discharging a fluid inside, an upstream rubber fixing metal member that is fixed to the upstream end portion of the rubber packer and is fixed to the injection material pipe, and a downstream end portion of the rubber packer. And a downstream side rubber fixing metal fitting that is fixed to the portion and is slidable with respect to the injection material pipe.

[0002]

2. Description of the Related Art Packers of the type that expand and contract with a fluid, for example, air packers, are roughly classified into fixed-type packers shown in FIG. 5 and slide-type packers as shown in FIG.

In FIG. 5, a boring hole (drilling hole) 1
A pipe 3 for an injecting material, which is provided with a packer 2 fixed at both ends, is inserted therein, and the excavating hole 1 is filled with the injecting material (indicated by an arrow A) by the pipe 3. The packer 2 is fixed to the injection material pipe 3 by an upstream (right side in FIG. 5) rubber fixing fitting 4 and a downstream (right side in FIG. 5) rubber fixing fitting 5.

A communication passage 6 is bored in the upstream rubber fixing member 4, and air (indicated by an arrow B in FIG. 5) is supplied to the space I in the packer 2 through the communication passage 6. Alternatively, air is discharged from the space I. And packer 2
The air (arrow B) may be supplied when the packer 2 is expanded, and the air in the packer 2 may be discharged through the communication path 6 when the packer 2 is contracted.

On the other hand, in the slide type packer shown in FIG. 6, the downstream side rubber fixing fitting 5A is slidable with respect to the pipe 3. Then, when air is supplied from the contracted state of the packer 2 (the state shown by the dotted line in FIG. 6) through the communication passage 6, the packer 2 expands to the state shown by the solid line in FIG. Here, the packer 2 is the pipe 3
When expanded in the radial direction (vertical direction in FIG. 6), the pipe 3 contracts in the longitudinal direction. However, since the downstream rubber fixing fitting 5A is slidable with respect to the pipe 3,
The packer 2 contracts in the longitudinal direction of the pipe 3 and slides toward the upstream rubber fixing fitting 4 side. As a result of such sliding movement, the elasticity of the packer is prevented from acting as a resistance at the time of expansion / contraction, and displacement accompanying expansion / contraction is easier than that of the double-end fixed type packer. Further, since the stress generated by such expansion and contraction is reduced, the life of the packer 3 is improved.

As described above, the slide type packer has a long product life and good durability as compared with the both end fixed type packer.

[0007]

However, in the case of using the slide type packer, when the pouring material is completely filled up to the downstream end of the packer, when the pouring material shrinks after the pouring material solidifies. Due to the solidified injection material, the flow-side rubber fixing metal fitting (indicated by reference numeral 5A in FIG. 6) may not be restored to the position before the expansion of the packer, and the backer may not return to the state before the expansion. If the packer is not restored to the state before expansion, the packer cannot be recovered after the injection material is solidified.

[0008] Such inconvenience becomes remarkable especially when high pressure resistance of rubber is required, for example, when a packer is arranged deep in the ground for construction.

On the other hand, it is possible to cope with this by increasing the restoring force of the packer to restore the position before expansion. However, such technology has not been proposed yet.

The present invention has been proposed in view of the above-mentioned problems of the prior art. Even when the injection material is filled up to the vicinity of the downstream end of the packer, the present invention can be easily restored to the state before expansion. The purpose is to provide a sliding packer that can be restored.

[0011]

SUMMARY OF THE INVENTION A slide type packer of the present invention is a rubber packer which is arranged at a predetermined position of an injection material pipe and is expandable / contractible by filling / discharging a fluid therein, and an upstream of the rubber packer. An upstream rubber fixing metal fitting fixed to a side end portion and fixed to the injection material pipe, and a downstream rubber fixing metal fitting fixed to a downstream end portion of the rubber packer and slidable with respect to the injection material pipe. In the slide type packer including, and, a slide pipe is fixed to an outer surface of the downstream rubber fixing metal fitting, and a plug member fixed to the injection material pipe is arranged inside the slide pipe. The plug member and the inner wall surface of the slide pipe are relatively slidable and sealed with respect to the injection material, and the injection material pipe, the downstream rubber fixing fitting, and the plug Annular space is constituted by the member and the slide pipe.

Here, in the present invention, when air, gas or other working fluid enters, fills and discharges into the annular space, the space inside the rubber packer and the annular space are provided in the downstream rubber fixing fitting. It is preferable that a communication passage communicating with the above is formed.

It is also preferable that the annular space is a closed space and the inside thereof is maintained in a vacuum state. In this case, in order to maintain the above-mentioned annular space in a vacuum state, the downstream rubber fixing metal fitting and the plug member should have a sufficiently slidable contact with the injection material pipe or the slide pipe. Must be sealed.

In carrying out the present invention, the slide pipe can be applied to any material as long as the injection material (for example, mortar) does not easily adhere thereto. For example, a so-called "steel pipe" or a resin pipe can be used as the slide pipe. Further, when it is necessary to perform boring again after the injection material is cured, it is preferable that the injection material is made of a material that is easily broken by the drilling equipment.

[0015]

When the slide type packer of the present invention having the above-mentioned structure is used for construction, air, gas, and other working fluids are filled in the rubber packer to expand the same, thereby making the rubber packer the excavation hole. To close it. As a result, similar to the prior art, the injection material is injected into the area below the expanded rubber packer, but the injection material does not enter the excavation hole in the area above the rubber packer. The plug member also prevents the injectant from entering the inside of the slide pipe.

When the rubber packer contracts, the downstream rubber fixing fitting fixed to the downstream end of the rubber packer is slidable with respect to the injection material pipe and fixed to the downstream rubber fixing fitting. The inner wall surface of the slide pipe is slidable relative to the plug member. Therefore, even if the injection material is filled up to the vicinity of the plug member, the downstream rubber fixing metal fitting can be moved extremely easily to the downstream side (the side filled with the injection material).
The contraction of the rubber packer is not hindered. That is, even if the downstream rubber fixing metal fitting moves to the injection material filling side (downstream side), only the slide pipe portion penetrates into the injection material, and the slide pipe has a radius larger than that of other members. The extremely thin directional wall allows very easy penetration into the filled injectate.

Here, the annular space (the annular space constituted by the injection material pipe, the downstream rubber fixing fitting, the plug member, and the slide pipe) is moved if the downstream rubber fixing fitting moves along with the contraction of the packer. Compressed. But,
When a communication passage that connects the space inside the rubber packer and the downstream rubber fixing fitting is formed, the working fluid (air, gas, etc.) compressed through the communication passage moves from the annular space to the rubber packer side. Since it escapes, the working fluid in the annular space is prevented from being compressed, and the reaction force or elastic repulsion force of the compressed working fluid moves the downstream rubber fixing metal fitting to the downstream side (filling material filling side). It will no longer be disturbed.

On the other hand, instead of providing the above-mentioned communication passage,
When the annular space is configured as a closed space and the inside of the closed space is maintained in a vacuum state, the negative pressure in the annular space causes the downstream side rubber fixing metal fitting to be constantly maintained when the rubber packer expands. This is convenient because it is urged to the downstream side (filling side of the injection material). Further, even if the downstream side rubber fixing metal fitting moves during the contraction of the rubber packer, there is no working fluid in the annular space, so there is no reaction force due to compression.

[0019]

EXAMPLES Examples of the present invention will be described below with reference to FIGS. The same members as those shown in FIGS. 5 and 6 are designated by the same reference numerals, and the duplicated description will be omitted.

1 and 2 show a first embodiment of the present invention. A sliding type packer of the present invention, which is generally indicated by reference numeral 10, is a rubber packer 2 which is arranged at a predetermined position of an injecting material pipe 3 and is expandable / contractible by filling / exhausting a fluid (for example, air) therein. An upstream rubber fixing member 4 fixed to the upstream end (direction indicated by arrow U) of the rubber packer 2 and fixed to the injection material pipe 3, and the downstream end (direction indicated by arrow D) of the rubber packer 2. And a downstream side rubber fixing fitting 12 fixed to the. The downstream side rubber fixing fitting 12 is provided with a sliding means 14 such as an O-ring.
It is configured to be slidable with respect to the injection material pipe 3.

Outer surface 1 of the downstream rubber fixing fitting 12
A slide pipe 16 is fixed to the 2S, and a plug member 18 is arranged inside the slide pipe 16 (inward in the radial direction). The plug member 18 is fixed to the downstream end of the injection material pipe 3, and is configured to be slidable with respect to the inner wall surface 16S of the slide pipe 16 by a sliding means such as an O-ring 20. There is. The space inside the slide pipe 16 in the radial direction is sealed against the injection material by the plug member 18.

An annular space 30 is constituted by the injection material pipe 3, the downstream rubber fixing fitting 12, the plug member 18, and the slide pipe 16. Then, in the downstream side rubber fixing fitting 12, a space I inside the rubber packer 2 and
A communication passage 32 that communicates with the annular space 30 is formed, and constitutes a flow path when a working fluid such as air enters, fills, and discharges from the internal space I of the rubber packer 2 into the annular space 30. To do.

In operating the embodiment of FIGS.
From the state (contracted state) indicated by (1) to the internal space of the rubber packer 2 through a working fluid supply pipe (not shown) (for example, a pipe arranged through the upstream rubber fixing fitting 4; not shown). If supplied, packer 2 as shown in FIG.
Expands and closes the boring hole 1 (expanded state). At that time, the downstream rubber fixing metal fitting 12 slides on the surface of the injection material pipe 3 and moves to the upstream side (arrow U side). In this expanded state, the injection material pipe 3 fills the injection material in the region of the boring hole 1 on the downstream side (arrow D side) of the slide-type packer 10 (not shown). At this time, the injected filling material is prevented from entering the slide pipe 16 by the plug member 18.

After the injection material filling operation is completed, the working fluid is discharged from the internal space I of the packer 2 through the working fluid supply pipe (not shown), and the packer 2 returns to the contracted state. Then, when the downstream rubber fixing metal fitting 12 moves to the downstream side U (filling material filling side), it slides with respect to the injection material pipe 3 by the O-ring 14, and the downstream rubber fixing metal fitting 12
Since the slide pipe 16 fixed to the slide member slides on the plug member 18, the downstream rubber fixing fitting 14 moves toward the downstream U without moving the plug member 18.

Here, even if the injection material is filled up to the vicinity of the plug member 18 in the expanded state of FIG. 2, the plug member 18 does not move to the downstream side D (the injection material filling side), and the downstream side. Since the rubber fixing member 12 moves to the downstream side D and the packer 2 contracts, the filled injection material does not interfere with the downstream rubber fixing member 12 to prevent the contraction of the packer 2. The slide pipe 16 is the only member that may enter the filled injectate, but the slide pipe 16 has a much smaller wall thickness than the other members, so it is extremely difficult to enter the inside of the injectate. Can easily enter. Therefore, the problem as in the prior art, that is, the movement of the downstream rubber fixing fitting 12 is obstructed by the presence of the filled injection material is prevented.

In other words, when the packer 2 contracts from the state shown in FIG. 2 to the state shown in FIG. 1, the downstream rubber fixing metal fitting 12 moves to the downstream side D, but comes into contact with the filled injection material and enters. Is a slide pipe 16 with a small radial wall thickness.
Only, and the presence of the injection material causes the downstream side rubber fixing bracket 1
2 is not prevented from moving to the flow side U.

When the downstream rubber fixing member 12 moves to the downstream side D, the annular space 30 also shrinks and the working fluid therein is compressed. However, through the communication passage 32, the annular space 30
The working fluid therein is discharged from the packer internal space I through a piping system (not shown). Therefore, it is completely prevented that the working fluid in the annular space 30 is compressed and the elastic repulsive force of the compressed working fluid prevents the downstream rubber fixing member 12 from moving to the downstream side D.

3 and 4 show a second embodiment of the present invention. The slide-type packer according to the second embodiment, which is generally indicated by reference numeral 40, has substantially the same configuration as the slide-type packer shown in FIGS. Therefore, in FIGS. 3 and 4, the same members as those in FIGS. 1 and 2 are denoted by the same reference numerals.

In the second embodiment, no communication passage (a flow path indicated by reference numeral 30 in FIGS. 1 and 2) which connects the annular space 30 and the internal space I of the packer 2 is provided, and the annular space 30 is formed. The pressure has been reduced to a vacuum. The annular space 30 is hermetically sealed by a seal member (not shown). That is, in the second embodiment, the annular space 30 is a closed space, and the inside thereof is maintained in a vacuum state. And
In order to maintain the annular space 30 in a vacuum state, the plug member 18 and the slide pipe 16 are slidably brought into contact with each other, where the downstream rubber fixing fitting 12 and the pouring material pipe 3 are slidably brought into contact with each other. The part that is covered is well sealed.

When the working fluid is supplied to the internal space I of the packer 2 from the contracted state shown in FIG. 3 by the working fluid supply system (not shown), the expanded state shown in FIG. 4 is obtained. At this time, the downstream side rubber fixing member 12 moves to the upstream side U, so that the annular space 30 is expanded. Here, since the annular space 30 is depressurized to a substantially vacuum state as described above, when the expanded state shown in FIG. 4 is reached, the pressure difference between the upstream side U and the downstream side U of the downstream side rubber fixing fitting 12 (see FIG. 4 causes a left-right pressure difference), and the downstream side rubber fixing member 12 is constantly urged to the downstream side D (right side in FIG. 4) due to the pressure difference. Therefore, when the packer is contracted, it becomes easier to move the downstream rubber fixing fitting 12 to the downstream side D.

With respect to other constitutions and action hardening, there is no difference between the first embodiment and the second embodiment.
Overlapping description is omitted.

It should be noted that the illustrated embodiment is merely an example and is not intended to limit the technical scope of the present invention.

[0033]

The effects of the present invention are listed below. (1) When the packer is moved from the expanded state to the contracted state, the downstream side rubber fixing metal fitting can be extremely easily moved to the side filled with the injection material, so that the contraction of the rubber packer is not hindered. (2) When a communication passage that connects the space inside the rubber packer and the downstream rubber fixing fitting is formed, the working fluid compressed through the communication passage escapes from the annular space to the rubber packer side. It is prevented that the reaction force or the elastic repulsion force of the working fluid compressed in the annular space hinders the movement of the downstream side rubber fixing member to the downstream side. (3) When the annular space is configured as a closed space and the inside of the closed space is maintained in a vacuum state, when the rubber packer expands, the negative pressure in the annular space fixes the downstream rubber. The metal fitting is constantly urged toward the injection material filling side. Therefore, it becomes easier to move the downstream rubber fixing fitting to the downstream side.

[Brief description of drawings]

FIG. 1 is a sectional front view showing a contracted state of a first embodiment of the present invention.

FIG. 2 is a sectional front view showing an expanded state of the first embodiment of the present invention.

FIG. 3 is a sectional front view showing a contracted state of the second embodiment of the present invention.

FIG. 4 is a sectional front view showing an expanded state of a second embodiment of the present invention.

FIG. 5 is a sectional front view showing a conventional technique.

FIG. 6 is a sectional front view of a conventional technique different from that shown in FIG.

[Explanation of symbols]

 1 ... Boring hole (drilling hole) 2 ... Both ends fixed type packer (rubber packer) 3 ... Injection material pipe A ... Injection material 4 ... Upstream rubber fixing metal fitting 5, 5A, 12 ... ..Downstream rubber fixing fittings 6, 32 ... Communication passage I ... Internal space of packer B ... Air 10,40 ... Sliding packer of the present invention U ... Upstream side 12S ... Outer surface of downstream rubber fixing bracket 14, 20 ... Sliding means (O-ring) 16 ... Slide pipe 16S ... Outer surface of slide pipe 18 ... Plug member 30 ... Annular space

Claims (3)

[Claims] 1. A rubber packer which is arranged at a predetermined position of an injection material pipe and is expandable / contractible by filling / discharging a fluid inside, and an injection material pipe fixed to an upstream end portion of the rubber packer. A slide-type packer including a fixed upstream rubber fixing fitting and a downstream rubber fixing fitting fixed to a downstream end of the rubber packer and slidable with respect to the injection material pipe. A slide pipe is fixed to the outer surface of the fixing member, and a plug member fixed to the injection material pipe is arranged inside the slide pipe. It is slidable relative to the wall surface and is sealed against the injected material, and an annular space is formed by the injected material pipe, the downstream rubber fixing fitting, the plug member, and the slide pipe. A sliding packer that is characterized by being 2. The slide-type packer according to claim 1, wherein a communication passage that connects the space inside the rubber packer and the annular space is formed in the downstream rubber fixing member. 3. The slide packer according to claim 1, wherein the annular space is a closed space, and the inside thereof is maintained in a vacuum state.