JP2003221824A - Casing having packer function - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a casing adaptable for a device for sampling underground water or a hydraulic test of a stratum, having an expansive and contractive function and capable of transmitting a turning force or a compressive force. <P>SOLUTION: A part of a packer 2 inserted in a hole excavating underground by an excavating machine is constituted in an external packer structure provided with a plurality of metallic plates between rubber tubes. Pressure water is supplied into a packer chamber 25 of an inner packer 3 inserted into the packer 2 to press the rubber tube of the inner packer 3 and elastically deform the external packer for expansion or contraction to the excavation hole in order to prevent water intrusion of other strata and perform a water sampling or a hydraulic test in a specified stratum. The packer 2 having the external packer structure has an expansion and contraction function and can transmit a force in the radial and axial directions through a metallic plate. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a casing having a packer function, which is used for a device for collecting groundwater after excavation for a water quality survey or the like, or a hydraulic test device for a formation. More specifically, the present invention relates to a casing having a packer function for collecting only groundwater in an aquifer at a predetermined position deep in the ground or for a hydraulic test of a formation.

[0002]

2. Description of the Related Art Groundwater is sampled for each aquifer after drilling a borehole to prevent groundwater pollution and for wells.
A hydraulic test survey is being conducted on the pollution status, water quality, and water volume of each layer. In order to collect this groundwater, for example, a continuous water sampling method or a method using a water sampling capsule has been proposed, but since it involves complicated and large-scale equipment, it is mainly used for surveying deep strata. It is used, and it is not suitable for investigation of polluted soil in factory land, investigation of sites such as gas stations, and hydraulic tests.

[0003] Another method is a driving-type groundwater sampling method for investigating a relatively shallow formation such as a factory site. The conventional driving method is to drive the device of the tube body with the screen (also called a filter) closed to a predetermined depth, then pull up the outer tube to a predetermined position to expose the screen, and from this exposed portion into the tube. This is a method of taking in groundwater, collecting it, and pulling it up to the surface of the earth to investigate the quality of the water or conduct a hydraulic test of the formation.

In the former case, the steel pipe casing is used in the excavation work involving the test of groundwater in the hole by the packer or the hydraulic test of the formation, so that the packer is installed in the bare hole portion under the casing to expand the packer. Then, various tests are performed by blocking the top and bottom of the water sampling point, and after the test, the packer is shrunk and the packer is collected, and deep drilling is performed again.
When carrying out the packer test collectively after the completion of excavation, pull up the installed casing to secure the open hole part where the packer is installed.

In connection with this, the same applicant as the present invention discloses, in Japanese Patent No. 305356, a packer inner tube to which a packer rubber is attached, and an inner peripheral hole of the packer rubber arranged on the outer circumference of the packer inner tube. With a configuration consisting of a conical cam to be inserted, by expanding the diameter of the packer rubber by pressing the conical cam of the packer inner tube, blocking the inflow of groundwater other than the predetermined position, sampling the groundwater only at the predetermined position, Alternatively, we are proposing a technology to conduct a hydraulic test of the formation.

This technique is a method in which a casing is once pulled up between the divided casings and then a packer rubber or the like is attached to a predetermined water sampling position later. There are difficulties in collecting the casing after water sampling, and the hassle of having to install a packer rubber for each test. In addition, the casing is dedicated to the survey, and the driving force cannot be transmitted. Therefore, there is a problem that a casing capable of sampling water cannot be inserted while excavating, and further improvement has been required.

[0007]

These conventional methods are as follows.
The former case is for grasping the characteristics of groundwater existing in deep stratum, and the latter case is a technique known as a small-scale groundwater survey or hydraulic test. In the former case, when water sampling or a hydraulic test of the formation is performed while excavating, a water sampling device is installed in the bare hole at the bottom of the steel pipe or FRP casing to conduct the water sampling or the hydraulic test of the formation. However, if the casing is to be inserted after completion of excavation and water sampling or geological testing of the formation is to be performed, the inserted casing must be pulled out and a packer must be installed in the open hole.

[0008] However, when the casing cannot be pulled out, there is a problem that water sampling or a hydraulic test of the formation cannot be performed. In addition, environmental protection measures have become stricter in recent years,
Leaving metal objects in the ground may also be a source of groundwater pollution. In addition, the casing should not be removed during water sampling or hydrological testing of the formation, and a packer should be installed at the same location. Ideally, it should be possible to collect and collect groundwater from only the stratum at a predetermined position, or perform a hydraulic test on the stratum.

The present invention was devised under such a technical background, and is mainly applied to the former case of investigating groundwater in a deep formation, and achieves the following objects.

An object of the present invention is to collect groundwater at a predetermined position or to efficiently collect water without polluting the environment of the hydraulic test area, or a packer function of a hydraulic test apparatus for a stratum. To provide a casing having.

Another object of the present invention is to provide a groundwater sampling system capable of accurately positioning a water sampling position or a stratum position for a hydraulic test by installing a casing at a predetermined position without pulling out even in a deep stratum. It is to provide a casing having a packer function of a water device or a hydraulic test device.

[0012]

A casing having a packer function of the present invention constitutes a part of a casing which is inserted into a hole excavated in the ground by an excavating machine, and comprises a tubular elastic body. , The elastic body being arranged along the elastic body and capable of moving relative to each other, the elastic body being expandable when receiving a force, contracting and restoring when not receiving a force, and transmitting force. It is characterized by being capable of transmitting.

The elastic body is composed of a tube-shaped first elastic body and a tube-shaped second elastic body which is superposed on and in close contact with the first elastic body, and the constituent body is the first elastic body. It is preferable that the second elastic body is closely sandwiched between the second elastic body and the second elastic body.

It is preferable that the structure comprises at least one kind having different thickness and shape. The material of this structure is preferably a plate-shaped material made of a rigid body such as metal, engineering plastic, or ceramics. The shapes of the constituents are preferably intermeshed and connected to each other.

The transmission force is the rotational force of the casing,
Alternatively, it is a transmission force applied in the axial direction. It is preferable that the first elastic body and the second elastic body are integrally configured by a rubber tube. Further, the force received by the first elastic body and the second elastic body may be a force in the radial direction, the rotation direction, or the axial direction.

[0016] The casing is preferably used as a packer of a test device for collecting and inspecting groundwater in an excavated hole. Further, the casing may be used as a packer for a hydraulic test device for a formation of a drilled hole.

The plate may be provided with a plurality of holes, and the first elastic body and the second elastic body may be integrated by injecting or adhering rubber into the holes. In the axial direction of the structure, a wire rod having fixed end portions may be provided through the plate to strengthen the axial direction of the structure. The wire means a wire made of a metal having long elasticity and a non-metal material such as a piano wire and a strip.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an overall view of an excavation and water sampling apparatus 1 for a groundwater quality test or hydraulic test in which a casing having a packer function of the present invention is applied to a packer.
The excavation water sampling device 1 is composed of a packer 2 fed into the hole during or after the excavation, and an inner packer 3 inserted inside the packer 2.

As shown in FIG. 2, the packer 2 is connected to a strainer pipe 5 having a slit 4 in the pipe body, and the strainer pipe 5 is sandwiched between the two packers 6a, 6a,
As shown in FIG. 3, the inner packer 3 is provided with a water sampling pipe 7 having a plurality of small holes 7a on its outer circumference, and the inner packing 3 is connected with the water sampling pipe 7 sandwiched therebetween to form two upper and lower digging directions. Internal packers 8a and 8b are provided.

The mutual relation between the packer 2 and the inner packer 3 when inserted in the ground is such that the strainer pipe 5 and the water sampling pipe 7 face each other, and the packers 6a, 6b and the inner packers 8a, 8b face each other. Has become. In this excavation and water sampling device 1, the packer 2 is a water sampling block portion of a casing that is inserted into the ground, and can be expanded and contracted toward the excavation hole wall side. As for the excavation method in the pre-water sampling process of the excavation water sampling device 1, detailed technology is described in Japanese Patent No. 3053563 of the same applicant, and thus detailed description thereof will be omitted. An outline will be described for the understanding of the present invention.

FIG. 4 is a sectional view showing a state of excavation. This excavation is performed by the wire line method. Five wing bits 10 which can be opened and closed are attached to the lower portion of the outer tube 9. The five wing bits 10 are arranged at equal intervals around the outer tube 9. When the wing bit 10 is opened, the radius of the circumference where five bodies are lined up is enlarged. When the outer tube 9 is rotationally driven, the diameter of the excavation hole 12 excavated by the excavation bit 11 is enlarged, and a large-diameter enlarged excavation hole is formed.

A casing 13 (packer) is inserted into the enlarged excavation hole 12 concurrently with excavation in parallel with excavation. At the tip of this casing 13, a casing bit 14
Is drilled and the hole 15 further enlarged than the drilled hole 12 is dug. Light and strong as a material for casing 13 F
RP is used. A state in which the wing bit 10 is closed and the outer tube is pulled out together with the 9 inner tube 16 is shown in FIG.

The casing 13 is left in the ground. The present invention uses this casing 13 as the packer 2 described above.
It is applied by replacing. In this description, the casing 13 is inserted at the same time as the excavation, but the casing 13 for excavation may be pulled out after the excavation and a casing dedicated to water sampling may be inserted.

FIG. 1 is a sectional view showing a state in which the excavation water sampling device 1 is installed at a water sampling position after excavation. Packer 2
At the water sampling point, the slit 4 or the strainer pipe 5 provided with the small hole is provided in a state of being sandwiched by packers 6a and 6b in the front and rear direction of the digging direction, and the slit 4 or the connection without the small hole is provided at a portion other than the water sampling point. It is composed of a pipe 17. A plurality of these pipes are connected according to the excavation depth and installed in the hole.

The strainer pipe 5 is pipe-shaped, and has male screws at both ends and a screen-shaped center portion having a plurality of narrow grooves or slits 4 in the circumferential direction. The groundwater is guided to the inner packer 3 side through the strainer pipe 5, and the slit 4 serves as a filter so that dust, dirt and the like do not enter at that time. Packers 6a and 6b are attached to both ends of the strainer pipe 5 via screws. This packer 6
In a and 6b, the mounting portion 6c constitutes a female screw, and an outer packer member 18 which is expandable and contractible mainly in the rubber tubes 18a and 18b is attached to the mounting portion 6c as a part of the casing. (See Figure 6).

As the strainer pipe 5 and the connecting pipe 17, a steel pipe, FRP or the like is used. The packers 6a and 6b will be described in detail later, but
The metal structure 19 as a plurality of plates is sandwiched between two rubber tubes 18a and 18b, and can be expanded and contracted in the radial direction and the axial direction.
The material of the plate is engineering plastic,
A plate other than metal can be used as long as it is hard and has strength such as ceramics, but in the following description, the plate is exemplified as a metal. A plurality of strainer pipes 5 are provided for each aquifer in the ground where water should be collected. The slit 4 or the small hole of the strainer pipe 5 is a hole for water passage, and is for guiding ground water for testing to the inner packer 3 side for water sampling.

On the other hand, the inner packer 3 is provided with a water sampling pipe 7 at the center thereof, and internal packers 8a and 8b are provided above and below the water sampling pipe 7 in the excavation direction. The internal packers 8a and 8b are provided at two places with the water sampling pipe 7 having the small hole 7a between them interposed therebetween. Support pipes 21 are attached to both ends of the water sampling pipe 7 via connecting members 20 which are joined by screws.

The bottom end of the support pipe 21, which is the lower end, is closed by a cap 22. Two receiving members 23a and 23b are fixed on the support pipe 21,
An internal packer member 24 is provided across the receiving members 23a and 23b. The mounting portions 8c at both ends of the internal packer member 24 are fixed to the receiving members 23a and 23b. An expandable and contractible inner packer member 24 having a rubber tube in the middle is attached to the attachment portion 8c as a part of the casing.

The inner packers 8a and 8b are different from the above-mentioned packers 6a and 6b in that the inner packer member 24 is a member having only a rubber tube and no metal structure is provided. The internal packers 8a and 8b have a structure in which mounting portions 8c are mounted on both ends, and are fixed to two receiving members 23a and 23b fixed to the support pipe 21. To form the internal packer chamber 25. Two internal packers 8a, 8b
Between them, the water supply hose 2 spirally extends over the water sampling pipe 7.
6 is attached between the two receiving members 23a and 23b.

In the support pipe 21 on the ground side, the supply pipe 27 is attached to the receiving member 23a while covering the support pipe 21.
Is attached. A branch member 28 is provided on the ground side so as to straddle the support pipe 21 and the supply pipe body 27, and a water passage 27a is provided between the branch member 28, the supply pipe body 27, and the support pipe 21 as a fluid passage. . Branch member 28
A joint 29 for supplying a fluid is provided in the container 29, and the joint 29 is provided with an opening / closing valve 30, an air vent valve, and a gauge 31.

Although the fluid such as water is not shown in the drawing, the supply pipe 2 is supplied from a fluid supply device such as a pump via the opening / closing valve 30.
7 is supplied to the water passage 27a. Next, the structure of the packer will be described in detail. FIG. 6 shows the external packer member 18
FIG. 3 shows a schematic cross-sectional view in which is cut in a direction perpendicular to the axial direction. The A side of the figure shows a state in which the external packer member 18 is contracted, and the rubber tubes 18a, 1
The metal structure 19 sandwiched between 8b is the individual metal plate 1
9a and 19b are connected (see FIG. 10).

The side B of FIG. 6 shows a state in which the outer packer member 18 is expanded, and the rubber tubes 18a, 18
Due to the elastic deformation of b, the metal structure 19 sandwiched between the rubber tubes 18a and 18b becomes an individual metal plate 19
A gap 19c is formed between a and 19b. FIG. 7 is a part of a schematic development view in which the outer packer member 18 is developed in the axial direction (digging direction).

The C side of the figure shows the contracted state, and the metal structure 1
The metal plates 19a and 19b of 9 are connected. The D side of the figure shows the expanded state, and each metal plate 1
A gap 19c is formed between 9a and 19b. FIG. 8 is FIG.
In the XX cross-sectional view, the outer packer member 18 has a flat shape, and the metal plates 19a and 19b of the metal structure 19 are connected to each other. FIG. 9 is a sectional view taken along line YY of FIG. 7, in which the outer packer member 18 is curved due to expansion. Also,
Each metal plate 19 is also elastically deformed in the axial direction.
A gap 19c is also formed on the axial direction side between a and 19b.
In this way, the outer packer member 18 becomes the inner packer member 2
When a force is applied from the 4 side, as shown in FIG. 9, it elastically deforms in a curved shape and expands in the radial direction and the axial direction.

FIG. 10 is a partial plan view showing the structure of the metal structure 19. The metal structure 19 is composed of two thin metal plates 19a and 19b, and one metal plate 19a is a plate in which two opposite corners of a quadrangular shape are cut out in a concave shape. The other metal plate 19b is a plate in which rectangular convex portions are provided at two corner portions of a square shape that face each other.

This metal plate 19b and metal plate 1
9a are regularly arranged on each other, and the metal plate 19a
The convex portion of the metal plate 19b is inserted into the concave portion. The metal structure 19 composed of the two metal plates 19a and 19b has two rubber tubes 1
Sandwiched between 8a, 18b, two metal plates 19a, 1
Rubber tube 18a, so that the mutual relationship of 9b does not shift.
18b is fixed or molded and integrated.

Although the metal structure 19 has been described as being sandwiched between the two rubber tubes 18a and 18b, when the packer member is manufactured by molding, the rubber tube and the metal structure are integrated at the molding stage. It does not come in two tubular forms. In this case, the one corresponding to one of the rubber tubes (18a) is defined as the front surface side, and the one corresponding to the other rubber tube (18b) is defined as the rear surface side.

Therefore, when the rubber tubes 18a, 18b are expanded, each metal plate 19a,
19b is in a state of being pulled away from each other as the rubber tubes 18a and 18b extend. Also, the metal plate 1
Since 9a and 19b are integrated with the rubber tubes 18a and 18b, they are not separated in a separated state, and a gap 19c is formed between the metal plates 19a and 19b according to the extension length of the expansion. This expansion can be radial or axial, or radial and axial, and can accommodate any direction.

When restoring, the rubber tubes 18a, 1
8b contracts and returns to its original shape, and the metal plate 19a, 19b of the metal structure 19 also returns to its original state and is in a connected state.
In this restoration configuration, since all the metal plates 19a and 19b are in the connected state, the force can be transmitted no matter which direction the force is applied because of the metal.

In the state of FIG. 10, the rubber tubes 18a, 18 are
The state in which b is expanded is shown, and a gap 19c is formed between the metal plate 19a and the metal plate 19b.
In this way, the outer packer member 18 is configured by combining a plurality of these two metal plates 19a and 19b, and when it expands, it has the gap 19c and extends in the radial direction and the axial direction.

FIG. 11 shows the end portion 19d of the metal structure 19. This end portion 19d is also made of a thin metal plate. This end 19d has a metal plate 1 at one end.
The metal structure 19 is held in a state where a part of 9a, 19b is fitted, and the other end is fixed to the mounting portion 6c of the packer together with the rubber tubes 18a, 18b. The mounting portions 6c and 8c are the packer 6
In the case of a and 6b, the strainer pipe 5 and the connecting pipe 17
Be screwed into. In the case of the internal packers 8a and 8b, they are attached to the receiving members 23a and 23b.

The structure of the casing having the packer function applied to the structure of the packer is as described above. Next, the excavation and sampling apparatus 1 adopting the casing of the present invention is used.
The water sampling method or the hydraulic test method will be described. As described above, the packer 2 is inserted into the ground with the strainer tube 5 and the packers 6a and 6b arranged at a plurality of predetermined positions. A plurality of strainer tubes 5 are provided in advance according to the number of aquifers to be sampled. In the case of the present invention, the packer 2 is inserted at the same time as the excavation, and it is possible to leave it in the ground even after the excavation is finished. At this time, the packer 2 is fixed to the predetermined position on the ground by the fixing member 32.

After excavating and pulling up the excavator, the inner packer 3 is inserted into the packer 2. Since the inner packer 3 has only one sampling position, the position of the sampling pipe is fixed to the sampling position of a predetermined aquifer of the packer 2, that is, the predetermined strainer pipe 5 position and the inner packer 3 is fixed. To do. In this state, the positions of the packers 6a and 6b and the internal packers 8a and 8b are also aligned.

Next, pressure water is supplied from a water supply device such as a pump (not shown) through the opening / closing valve 30. The supply device may also be an air supply device, in which case the pressurized air will be sent to the joint 29. Since the joint 29 is provided with the opening / closing valve 30, the amount of water can be adjusted by opening / closing the opening / closing valve 30 by the handle. Further, since the gauge 31 is attached, the state of water pressure can be confirmed by visually observing the scale of the gauge 31. Furthermore, the air can be bleeded by the air bleeding valve. The pressure water is
It is guided to the water passage 27 a of the supply pipe body 27 through the branch member 28.

Further, the pressurized water reaches the receiving member 23a and is guided to the internal packer chamber 25 of the internal packer 8a located at the upper position of the inner packer 3 through the water passage hole 23c of the receiving member 23a. The pressure water is still sent and the receiving member 2
Water passage hole 2d of receiving member 23a of internal packer 8b located in the lower part through water passage hole 23d of 3b and water supply hose 26.
It is guided to the internal packer room 25 through 3e. The pressurized water is received in this internal packer chamber 25. If pressured water is further fed in this state, the volume of the inner packer chamber 25 increases and the upper and lower inner packer members 24 elastically deform, and the inner packer member 24 expands to expand the rubber tube 1.
Press 8a and 18b.

The pressed rubber tubes 18a and 18b also elastically deform and expand, and are pressed against the wall of the excavation hole. Since the rubber tubes 18a and 18b have a certain width, they are pressed against the wall of the excavation hole in a strip shape to prevent groundwater from entering the excavation hole from the stratum. Since the upper and lower rubber tubes 18a and 18b are elastically deformed and expanded and pressed against the wall of the drill hole, the strainer pipe 5 sandwiched between
The groundwater of the other layer does not invade, and the groundwater of only the stratum region of the strainer pipe 5 is taken in. In this way, the rubber tubes 18a and 18b have a certain width and are pressed against the wall of the borehole to maintain water absorption from other layers and perform a water sampling or hydraulic test.

Groundwater from a predetermined stratum is guided to the inner packer 3 side through the slits 4 of the strainer pipe 5 with dust and the like removed. In addition, groundwater is small hole 7
The water is introduced into the water sampling pipe 7 through a, passes through the inside of the support pipe 21 and is collected on the ground for water sampling or a hydraulic test.
Since this stratum is deep, this recovery is generally performed by pumping water using a pump or the like.

Since the cap 22 is attached to the end of the support pipe 21, the groundwater to be sampled is never returned to the stratum again. Although not shown, the collected groundwater is subjected to a water quality test or a hydraulic test by a predetermined test device. After the water sampling or hydraulic test is performed in this way and after the water quality test and the like are completed, the packer 2 is pulled up to the ground while the strainer pipe 5 and the packers 6a and 6b are directly connected. Therefore, no part of the member is left in the ground. Further, with the casing 13 installed, a hydraulic test, a groundwater sampling test, and the like can be repeatedly performed when necessary even in a deep drilling hole for a long period of time.

[Other Embodiments] The metal structure of the packer has other structures besides the above-mentioned forms, so that an example will be described below. FIG. 12 is a partial plan view of a metal structure 41 in which a plurality of metal plates 40 of one type are assembled. The metal plate 40 has a substantially crafted shape, and is a form in which a triangular convex portion 40a and a concave portion 40b are fitted into each other. Since the illustrated form shows the packer member in an expanded state, there is a gap 42 between the metal plates. If contracted, all metal plates 4
0s are connected to each other and become a united state.

Also in this embodiment, the force can be transmitted regardless of the direction in which the force is applied (for example, the rotation direction of the external water sampling pipe or the excavation direction). The effect does not change even if the form of this figure is changed 90 degrees to the side. Although not shown, the triangular protrusion 40a of the metal plate 40 is also included.
The concave portion 40b and the concave portion 40b may have a rounded R shape as long as the metal plates do not separate from each other. In this case, the concentrated stress when the metal plate 40 receives a force is reduced.

In FIG. 13, one type of substantially square metal plate 43 is provided with two triangular protrusions 43a and two recesses 43b.
FIG. 6 is a partial plan view of a metal structure 44 in which a plurality of metal plates 43, each of which is provided at a portion and in which the convex portion 43a and the concave portion 43b are fitted to each other, are assembled. In the case of this figure as well, similar to FIG. 12, when the metal structure 44 contracts, all the metal plates 43 are connected and integrated, and the force can be transmitted no matter which direction the force is applied.

FIG. 14 shows the same form as FIG. 13, but the metal structure 46 is formed as an assembly of the metal plates 45 in which the convex portions 43a and the concave portions 43b of the metal plate 43 are R-shaped. Although FIG. 15 is basically the same as FIG. 13 and FIG. 14, the metal structure 49 is composed of two kinds of metal plates, a metal plate 47 having only convex portions and a metal plate 48 having only concave portions. FIG. 3 is a partial plan view showing the form of FIG.

FIG. 16 shows two types of plates 5 having different shapes.
It is a partial plan view of a structure body 52 in which a plurality of 0, 51 are combined. These plates 50, 51
As shown in the figure, the rotational direction of the structure 52 is regulated by the mutual plates, but the axial direction is not regulated, so that it has a shape that shifts in the axial direction when a force is applied from the outside. The plate 50 is a plate fitted to the end portion 53 of the structure 52, and the plate 51 is a component forming a main part of the structure 52. After being fitted to the plate 50, they are fitted to each other by the same plate 51. Structure 52
The intermediate portion is entirely composed of this plate 51.

The two types of plates 50 and 51 are provided with holes 50a and 51a, respectively. These plates 5
0 and 51 are sandwiched between two rubber tubes as in the above-described embodiment. When the structure 52 is molded, as shown in FIG. 17, which is a partial cross-sectional view of FIG.
2 for the inner rubber tube 54 and the outer rubber tube 55
The seed plates 50 and 51 are sandwiched between the holes 50a and 5
Rubber is injected through 1a and two rubber tubes 5
4,55 become one.

Rubber may be adhered to the holes 50a and 51a. With this configuration, the plates 50 and 51 do not shift from each other. In addition, in these plates 50 and 51, along the axial direction of the structure 52,
A plurality of piano wires 56 are inserted through. The end portion 56 a of the piano wire 56 is connected to both end portions 53 of the structure 52. Therefore, by adding the piano wire, the structure 52 is reinforced not only in the radial direction but also in the axial direction by the external force, and the casing is sufficiently resistant to the resistance when excavating into the ground. Becomes However, when the packer expands, the rubber tube is deformable, so that the rubber tube swells at that position in the radial direction, but the piano wire does not extend in the axial direction, so the packer as a whole contracts.

FIG. 18 shows a modification of FIG.
Although the basic structure does not change, the shape of the plate 51 shown in FIG. 16 is symmetrical, and it is different in that it has a shape that fits into the plate 50 and has two types of plates 57 and 58. In the case of this example, as in the case of FIG.
Since it has a shape that deviates in the axial direction, the plates 57 and 58 are held through the holes 57a and 58a provided in the plates 57 and 58 as described above, and the piano wire 56 strengthens the axial direction. .

Although the embodiment of the present invention has been described above, it goes without saying that the subject of the present invention is not limited to this. A wire or a steel wire such as a piano wire may be used as an auxiliary material of a form different from that of the embodiment in the metal structure of the packer member. However, in this case, since a part of the casing inevitably shifts in the axial direction when the expansion and contraction operations are performed, the invention can be applied to the case where the casing may shift. Also in the case of this piano wire configuration, the force can be transmitted in the radial direction and the axial direction. The metal structure 19
Is configured to be sandwiched between the two rubber tubes 18a and 18b.
It is also possible to provide only one layer of b and mechanically fix the metal structure 19 thereto or adhere it with an adhesive.

[0057]

As described above, since the packer portion of the casing is made of the elastic body having a plurality of constituents,
After inserting the casing, in the case of groundwater survey, it is possible to take water from different strata by utilizing the expansion and contraction functions, and the casing draws the groundwater from the specified aquifer without removing the casing after every water sampling. Or, it became possible to conduct a hydraulic test of the formation.

Since this casing is an excavable structure, the rotating force or the pressing force can be transmitted like the integrated steel pipe, so that the casing can be inserted during excavation. Immediately after excavation, water is collected in this casing,
It is also possible to conduct hydraulic tests, etc., and it is possible to continuously collect water or conduct hydraulic tests, etc., so that the efficiency is improved, and as a result, groundwater in the stratum at the predetermined position is accurately collected or water in the stratum at the predetermined position. It became possible to perform a physical examination and perform highly accurate measurements. In addition, the structure is simple and it is possible to realize an economically low-cost device.

[Brief description of drawings]

FIG. 1 is an overall view of an excavation and water sampling device to which a casing having expansion and contraction functions is applied.

FIG. 2 is a sectional view showing only the packer of FIG.

3 is a sectional view showing only the inner packer of FIG.

FIG. 4 is a partial cross-sectional view showing a state of excavating by an excavating machine.

FIG. 5 is a partial cross-sectional view showing a state in which the excavation device is pulled out after the excavation and the casing is left in the configuration of FIG. 4;

FIG. 6 is a schematic cross-sectional view in which the packer member is cut into a circle, and the A section shows a contracted state and the B section shows an expanded state.

FIG. 7 is a developed plan view showing a metal structure array of a packer member, in which a C portion shows a contracted state and a D portion shows an expanded state.

8 is a sectional view taken along line XX of FIG.

9 is a cross-sectional view taken along line YY of FIG. 7.

FIG. 10 is a partial plan view showing a metal structure in which metal plates are fitted and assembled together.

FIG. 11 is a partial plan view of an attachment portion of a metal structure showing an end portion of a packer member.

FIG. 12 is a partial plan view showing another embodiment of the metal structure, in which the metal plate has a substantially letter-like shape.

FIG. 13 is a partial plan view showing another embodiment of the metal structure, in which the metal plate has a substantially quadrangular shape.

FIG. 14 is a partial plan view showing another embodiment of the metal structure, in which the fitting portion of the metal plate has an R shape.

FIG. 15 is a partial plan view showing another embodiment of the metal structure, in which the metal plate has a substantially quadrangular shape and is composed of two types of irregularities.

FIG. 16 is a partial plan view showing another embodiment of a metal structure, showing a configuration in which metal plates are combined in an irregular quadrangular shape.

FIG. 17 is a partial cross-sectional view of FIG.

FIG. 18 is a partial plan view showing another embodiment of the metal structure, and shows a configuration in which two kinds of symmetrical metal plates are combined.

[Explanation of symbols]

1 ... Drilling water sampling device 2 ... packer 3 ... Inner packer 5 ... Strainer tube 6a, 6b ... External packer 7 ... Water sampling pipe 8a, 8b ... Internal packer 18a, 18b ... Rubber tube 19, 41, 44, 46, 52, 59 ... Metal structure 19a, 19b ... Metal plate

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Shuji Matsumura             No. 2 Tsukutocho, Shinjuku-ku, Tokyo Co., Ltd.             Kumagai Gumi Tokyo Head Office (72) Inventor Kazuo Oshima             3-21-1, Nihonbashihamacho, Chuo-ku, Tokyo             Nihonbashi Hamacho F Tower 16th floor Mitsubishi Materials             Resource Development Co., Ltd. (72) Inventor Keiji Iwasaki             1534 Hara, Karatsu City, Saga Prefecture Wybi Co., Ltd.             -In M F-term (reference) 2D043 BA09 BB09

Claims (10)

[Claims] 1. A part of a casing to be inserted into a hole excavated in the ground by an excavating machine, the tubular elastic body and the elastic body arranged along the elastic body and capable of moving relative to each other. The elastic body is capable of expanding when a force is applied, and is capable of contracting and restoring and transmitting a transmission force when a force is not applied. A casing that has a packer function. 2. The casing having a packer function according to claim 1, wherein the elastic body is a tube-shaped first elastic body, and a tube-shaped second elastic body that is closely attached to the first elastic body. And a casing having a packer function, wherein the constituent body is closely sandwiched between the first elastic body and the second elastic body. 3. The casing having a packer function according to claim 1 or 2, wherein the structural body is composed of one or more kinds of plates, and the plates are fitted and connected to each other in a concavo-convex state. A casing that has a packer function. 4. A casing having a packer function according to claim 1 or 2, wherein the transmission force is a rotational force of the casing or an axial transmission force. 5. The packer function casing according to claim 2, wherein the first elastic body and the second elastic body are integrally configured by a rubber tube. Casing having. 6. The casing having a packer function according to claim 2, wherein the force received by the first elastic body and the second elastic body is a force in a radial direction or an axial direction. A casing with a packer function. 7. A casing having a packer function according to claim 1, which is selected from claims 1 to 6, wherein the casing serves as a packer of a test device for collecting and inspecting groundwater in the excavated hole. A casing having a packer function characterized by being used. 8. A casing having a packer function according to claim 1, which is selected from claims 1 to 6, wherein the casing is used as a packer of a hydraulic test device for a formation of the excavated hole. A casing with a characteristic packer function. 9. The casing having a packer function according to claim 3, wherein the plate is provided with a plurality of holes for integrating the first elastic body and the second elastic body. A casing with a packer function. 10. The casing having a packer function according to claim 3, wherein a wire having fixed end portions is provided through the plate in the axial direction of the structural body. Casing having.