JP6316225B2 - On-site permeability test device and installation method thereof - Google Patents

Description

  The present invention relates to an in-situ permeability test apparatus that can measure the saturated permeability coefficient of unsaturated ground in the field without using boring, and an installation method thereof. More specifically, the present invention relates to an outer pipe and an inner pipe. Fixing a cone for driving having a larger diameter than the inner tube at the tip of the inner tube of the double tube composed of a tube, and striking the large diameter portion of the cone at the lower end surface of the outer tube, The present invention relates to an in-situ water permeability test apparatus and a method for installing the same, which are driven into the ground and then exposed to a water permeable portion provided in the lower portion of the inner pipe to measure a water permeability coefficient.

  Conventionally, as a test apparatus for measuring a water level and the like by driving a double pipe composed of an outer pipe and an inner pipe into the ground and exposing a water-permeable portion provided at the lower portion of the inner pipe, Japanese Patent Application Laid-Open No. 2009-228322 The thing of (patent document 1) is well-known.

  The measurement test apparatus described in the publication includes an outer tube that can be added to form a water level observation hole, an inner tube that can be fitted with a cylindrical hydrophilic filter on its outer peripheral surface, and can protrude from the tip of the outer tube, A distal end cone fixed to the distal end of the tube, and the distal end cone is transmitted by an outer percussion surface receiving a striking force transmitted by the outer tube and a striking rod inserted from the top of the outer tube. An inner striking surface that receives a striking force, and shields water between a lower outer periphery and an upper outer periphery of the perforated portion formed by the inner tube and the hydrophilic filter, and a lower end inner periphery of the outer tube, respectively. A ring is attached, and the water level gauge is formed so as to be inserted from the top of the outer tube to the inside of the perforated portion.

  And when installing the said measurement test apparatus, in the state which water-blocked between the lower end inner periphery of the outer tube | pipe by the O-ring of the lower outer periphery of a hole part, and the hole part obstruct | occluded in an outer pipe | tube. Apply the striking force and drive it to the top of the test section in the ground, then insert the striking rod into the tip cone and apply the striking force to leave the outer tube and project the inner tube to make the water permeable section a ground test section. Is opened, and the O-ring on the upper outer periphery of the perforated portion is in a state of shielding water from the lower end inner periphery of the outer tube, and the striking rod is pulled out and installed so that the water level gauge is inserted to the perforated portion.

  As another installation method, first, with the O-ring below the perforated portion blocking water between the lower end and the inner periphery of the outer tube, a striking force is applied to the outer tube to directly below the test section. It is also possible to employ a method in which the outer tube is driven up to the top of the test section. In this case, the tip cone and the perforated portion remain in the same position due to the frictional force between the tip cone and the ground. Accordingly, there is a method in which the perforated part is opened in the test section of the ground, and the O-ring above the perforated part is installed so as to be in a state where water is blocked from the inner periphery of the lower end of the outer tube. In the case of this installation method, since the internal striking surface provided on the tip cone is not used, the installation method does not use a part of the invention-specific matters of the measurement test apparatus described in the publication.

JP 2009-228322 A, page 1, FIG. 1 and FIG.

  However, when installing the measurement test apparatus, the outer tube and the inner tube are driven to just above the observation section, and then the outer rod is left by inserting a striking rod into the tip cone and applying striking force, Since the inner pipe projects again toward the ground, depending on the formation condition, or when the inner pipe is slightly pushed away from the vertical direction, the inner pressure is applied to the inner pipe, There is a risk that the filter or the perforated part may be damaged, or the through hole may be ablated. Further, when the ground is hard and it is difficult to drive with a small diameter striking rod, the test section may not be exposed.

  Furthermore, in the case of adopting the above other installation methods, when the water gauge is installed deep, it is often difficult to smoothly pull up the outer pipe due to friction with the formation, and in addition, the outer pipe is pulled up. At this time, the inner pipes may be pulled up together and may be out of the desired test section.

  The present invention has been made in view of the above points, and the object of the present invention is to drive the inner tube to a desired permeability test section in a state where the permeable partition portion of the inner tube is protected by the outer tube, and then to the inner tube. An in-situ permeability test apparatus and an installation method thereof that can easily pull out an outer pipe while keeping the position of the pipe in the test section.

  Another object of the present invention is to provide an on-site water permeability test apparatus and a method for withdrawing it, which can easily remove all equipment driven into the ground after the test is completed.

An in-situ permeability test apparatus according to claim 1 includes an outer tube that is driven into the ground to form an inner tube insertion hole, an inner tube that is inserted into and retracted from the outer tube, and a small diameter at a lower portion of the inner tube. A percussive force transmitted from the lower end of the outer tube, comprising a water-permeable partition portion formed by opening a plurality of water-permeable holes, and a sharp tip portion fixed to the tip portion of the inner tube. An outer peripheral striking surface for receiving the water, and a water stop portion formed to slide with respect to the water-permeable partition portion inside the lower portion of the outer tube and to prevent water from entering the outer tube. An outer tube that is a water permeability test device, includes an insertion portion through which the inner tube is inserted, and a connecting portion that is connected to a cord-like body that pulls the outer tube upward, and is detachably fixed to an upper portion of the outer tube An outer pipe mounting member for pulling up, and a connecting part connected to the cord-like body via a connecting part of the outer pipe, An inner pipe mounting member that is detachably fixed to the upper part of the inner pipe, and when the outer pipe is pulled up to expose the water permeable partition portion, the outer pipe mounting member attached to the outer pipe is The cable is positioned below the inner tube mounting member attached to the inner tube, and the cord-like body is connected to the connecting portion of the inner tube mounting member via the connecting portion of the outer tube mounting member. by pulling force pulling the Jo body upwards, a force for pulling the outer tube, and characterized in that said inner tube by generating a press under gel force downwardly generated based on the pulling force pulling the outer tube To do.

  In the in-situ permeability test apparatus according to claim 1, the inner pipe is driven to a desired permeability test section in a state in which the permeable partition portion of the inner pipe is protected by the outer pipe, and then the inner pipe is inserted into the permeable test section. The outer tube can be easily pulled out while being reliably positioned in the test section.

  The field permeation test apparatus according to claim 2 is the field permeation test apparatus according to claim 1, wherein the outer tube mounting member includes a cylindrical outer tube mounting member main body through which the inner tube can be inserted, and the outer tube. It is characterized by comprising a rope that is rotatably supported between brackets that are provided on the outer periphery of the mounting member main body so as to face each other in the radial direction.

  In the in-situ permeability test apparatus according to claim 2, since the inner tube can be inserted into the outer tube mounting member body, the outer tube mounting member is in a state where the inner tube protrudes from the outer tube. Can be attached to the outer tube, and the outer tube can be pulled up by winding a cord-like body such as a metal wire around the rope.

  The in-situ permeability test apparatus according to claim 3 is the in-situ permeability test apparatus according to claim 1 or 2, wherein the inner tube mounting member includes an inner tube mounting member body having a diameter substantially the same as the inner tube, And a connecting ring provided at the upper end of the tube mounting member.

  In the in-situ permeability test apparatus according to claim 3, since the connecting ring can be attached to the inner pipe, it is easy to connect the cord-like body to the inner pipe.

  The installation method of the on-site permeability test apparatus according to claim 4 is the installation method of the on-site permeability test apparatus according to any one of claims 1 to 3, wherein the sharpened tip is fixed to the outer pipe. In the state where the outer tube is in contact with the outer circumferential striking surface, hitting the upper portion of the outer tube and driving it into the ground to a desired depth; and the inner tube is more than the outer tube A step of fixing the outer tube mounting member and the inner tube mounting member to the outer tube and the inner tube, respectively, in a state of protruding upward, and connecting one end of the cord-like body to the connecting portion of the inner tube And connecting the other end to the connecting portion and connecting to the lifting device, and pulling up the outer tube while holding down the inner tube while pulling up the cord-like body by the lifting device, and the water permeable compartment And a step of exposing the portion.

  In the installation method of the in-situ permeability test apparatus according to claim 4, the inner pipe is driven to a desired permeability test section in a state where the permeable partition portion of the inner pipe is protected by the outer pipe, and then the inner pipe is The outer tube can be easily pulled out while being reliably positioned in the water permeability test section.

According to the in-situ permeability test apparatus according to claim 1, an outer tube that is driven into the ground to form an inner tube insertion hole, an inner tube that is inserted into and retracted into the outer tube, and a lower portion of the inner tube A permeable partition portion formed by opening a plurality of small-diameter permeable holes and a sharp tip fixed to the tip of the inner tube, and the sharp tip is transmitted from the lower end of the outer tube. An outer circumferential striking surface that receives a striking force, a water stop portion that is formed to slide against the water permeable partition portion inside the lower portion of the outer tube and to prevent water from entering the outer tube; An in-situ permeability test apparatus having an insertion portion through which the inner tube is inserted and a connecting portion connected to a cord-like body that pulls the outer tube upward, and is detachably fixed to the upper portion of the outer tube. An outer tube mounting member for pulling up the outer tube, and a connecting portion connected to the cord-like body via a connecting portion of the outer tube An outer tube mounting member that is attached to the outer tube when the upper tube is pulled up and the inner tube mounting member is detachably fixed and the outer tube is pulled up to expose the water permeable partition portion. Is positioned below the inner tube mounting member attached to the inner tube, and the cord-like body is connected to the connecting portion of the inner tube mounting member via the connecting portion of the outer tube mounting member. by pulling force pulling the cord-like body upward, raising the force pulling the outer tube, said outer tube said inner tube by generating a press under gel force downwardly generated on the basis of the pulling force Since the inner pipe is driven to the desired water permeability test section in a state where the water permeation section of the inner pipe is protected by the outer pipe, the inner pipe is then securely positioned in the water permeability test section. Easily pull out the outer tube. Can.

  According to the in-situ permeability test apparatus according to claim 2, in the in-situ permeability test apparatus according to claim 1, the outer tube mounting member includes a cylindrical outer tube mounting member main body through which the inner tube can be inserted; A cable ring rotatably supported between brackets projecting radially outwardly on the outer periphery of the outer pipe mounting member main body, so that the inner pipe is attached to the outer pipe mounting member main body. Even when the inner tube protrudes from the outer tube, the outer tube mounting member can be mounted on the outer tube, and, for example, the metal wire, etc. The outer tube can be pulled up by winding a cord-like body.

  According to the in-situ permeability test apparatus according to claim 3, in the in-situ permeability test apparatus according to claim 1 or 2, the inner tube mounting member includes an inner tube mounting member main body having a diameter substantially the same as the inner tube. And a connecting ring provided on the upper end of the inner pipe mounting member, so that the connecting ring can be mounted on the inner pipe, and the cord-like body can be easily connected to the inner pipe. .

  According to the installation method of the in-situ permeability test apparatus according to claim 4, the in-situ permeability test apparatus according to any one of claims 1 to 3, wherein the sharp tip is fixed to the outer tube. The inner tube is inserted, the upper tube hits the upper part of the outer tube with the outer tube in contact with the outer circumferential striking surface, and is driven into the ground to a desired depth; A step of fixing the outer tube mounting member and the inner tube mounting member to the outer tube and the inner tube, respectively, in a state of projecting upward from the tube, and connecting one end of the cord-like body to the inner tube Connecting the other end to the connecting portion and connecting to the pulling device, pulling the cord-like body by the pulling device, and pulling the outer tube down while holding the inner tube downward. And the step of exposing the water permeable partition part. Driving the field portion to the inner tube of the desired permeability test interval while protected by the outer tube, and then while keeping reliably position the inner tube in the permeability test section, the outer tube can be easily pulled out.

It is a perspective view of the state where the inner pipe of the field permeability test device concerning the present invention was inserted in the outer pipe. (A) is an exploded front view of an outer pipe, (b) is an exploded front view of an inner pipe. (A) is an enlarged vertical sectional view of the distal end portion of the outer tube, and (b) is an enlarged longitudinal sectional view of the distal end portion of the inner tube. (A) is a front view of the joint pipe of the outer pipe, (b) is a front view of the joint pipe of the inner pipe. (A) is a front view and a plan view of the knocking head, (b) is a front view and a plan view of the outer tube mounting member, and (c) is a front view and a plan view of the inner tube mounting member. It is the schematic which shows an example of the installation method of the on-site permeability test apparatus which concerns on this invention. It is a front view of the apparatus main body equipped with the knocking head. It is a principal part enlarged view of the 4th process (4) of FIG. It is a principal part enlarged view of the 5th process (5) of FIG. It is the schematic which shows an example of the withdrawal method of the on-site water permeability test apparatus which concerns on this invention. It is a principal part enlarged view of the 2nd process (2) of FIG. It is a front view which shows another outer pipe mounting member. It is a front view which shows another outer pipe mounting member.

  Embodiments of an on-site permeability test apparatus, its installation method and withdrawal method according to the present invention will be described below with reference to the drawings.

  FIG. 1 is a perspective view showing an apparatus main body 10 of an on-site permeability test apparatus according to the present invention. The on-site permeability test apparatus main body 10 (hereinafter referred to as “apparatus main body 10”) is an outer tube 20 (and will be described later if necessary). And an inner tube 30 that can be inserted into the outer tube (and a joint inner tube 300 that will be described later if necessary). 2 (a) is an exploded front view of the outer tube 20, FIG. 2 (b) is an exploded front view of the inner tube 30, and FIG. 3 (a) is an enlarged longitudinal sectional view of the distal end of the outer tube 20. FIG. 4B is an enlarged vertical sectional view of the distal end portion of the inner tube 30.

  As shown in FIG. 1, FIG. 2 (a) and FIG. 3 (a), the outer tube 20 has male screw portions 22 and 23 formed at the upper and lower ends, respectively, and has a length of about 950 mm, an outer diameter of about 50 mm, and an inner diameter. A long cylindrical steel pipe 21 having a size of about 40 mm and an outer pipe lower end head 24 fixed to the lower end of the steel pipe 21 are formed.

  The outer pipe lower end head 24 is provided with a female screw part 25 at the upper end of a cylindrical steel pipe body having a length of about 100 mm so as to be screwed into the male screw part of the steel pipe 21, and the lower inner peripheral wall has two upper and lower parts. The stage is formed with O-rings 26 and 26 interposed therebetween.

  As shown in FIGS. 1, 2B and 3B, the inner tube 30 has a length of about 1120 mm, an outer diameter of about 35 mm, and an inner diameter so that the inner tube 30 can be inserted into and retracted from the outer tube 20. A long cylindrical stainless steel pipe 31 having a size of about 25 mm and a sharpened tip 34 fixed to the lower end of the stainless steel pipe 31 are formed.

  The stainless steel pipe 31 is formed with male threaded portions 32 and 33 at its upper and lower ends, respectively, and a plurality of water-permeable holes 38, 38. doing.

  The tip sharpened portion 34 is formed of steel, and the tip portion 36 is formed in a conical shape, and a female screw portion 35 is formed in the upper portion. Then, when the diameter of the tip sharpened portion 34 is formed to be about 50 mm, which is larger than the diameter of the stainless steel tube 31, and inserted into the outer tube 20, the larger diameter portion is brought into contact with the lower end surface of the outer tube 20, The outer periphery is formed so as to be the outer periphery driving large diameter portion 37 to be hit.

  FIG. 4A is a front view of the joint outer tube 200 of the outer tube 20, and FIG. 4B is a front view of the joint inner tube 300 of the inner tube 30.

  The joint outer pipe 200 is a joint pipe for adding the outer pipe 20 and is formed of a steel pipe having substantially the same size as the outer pipe 20, and a male screw portion 220 is formed at one end of the steel pipe, and at the other end. An internal thread 230 is formed. Similarly, the joint inner pipe 300 is a joint pipe for adding the inner pipe 30, and is formed of a steel pipe having approximately the same size as the inner pipe 30, and is formed at one end of the steel pipe. A male screw portion 320 is formed, and a female screw 330 is formed at the other end.

  5A is a front view and a plan view of the knocking head 40, FIG. 5B is a front view and a plan view of the outer pipe mounting member 50, and FIG. 5C is a front view and a plan view of the inner pipe mounting member 60. FIG.

  The knocking head 40 is a driving member that is formed so as to be detachable from the outer pipes 20 and 200 and is used when driving the apparatus main body 10 (the outer pipes 20 and 200 and the inner pipes 30 and 300). As shown in FIG. 5 (a), a striking portion 42 formed of a solid round steel material on the upper part of a knocking head main body 41 formed of a short steel pipe having the same diameter as the outer pipes 20 and 200. A female screw portion 43 into which the male screw portions 22 and 220 of the outer pipes 20 and 200 can be screwed is formed on the lower inner periphery of the knocking head main body 41. A clearance opening 44 into which the distal ends of the inner tubes 30 and 300 can enter is formed above.

  The outer pipe mounting member 50 is formed to be detachably fixed to the outer pipes 20 and 200, and the apparatus main body 10 (the outer pipe 20 and the inner pipe 30) is driven into a predetermined water permeability test section Z. After that, it is used when only the outer pipes 20 and 200 are pulled up in order to expose the water-permeable partition part Q (see FIG. 6).

  As shown in FIG. 5B, the outer pipe mounting member 50 has male threaded portions 22 and 220 of the outer pipes 20 and 200 inside one end of the outer pipe mounting member main body 51 formed of a short steel pipe. A threadable female thread portion 52 is formed, and a pair of brackets 53 and 53 are fixed on both sides of the outer peripheral portion of the other end by fixing means such as welding so as to protrude outward in the radial direction. Yes. A bolt B is inserted between the brackets 53 and 53 from the outside and fixed with a nut N, and the rope 54 is rotated so that the bolt B inserted between the brackets 53 and 53 is an axis. Freely inserted.

  As shown in FIG. 5C, the inner pipe mounting member 60 has male threaded portions 32 and 320 of the inner pipes 30 and 300 inside one end of the inner pipe mounting member main body 61 formed of a short steel pipe. Is formed, and an annular connecting ring 63 is fixed to the upper part of the other end by a fixing means such as welding.

  The on-site permeability test apparatus according to the present invention includes the apparatus main body 10 and the outer pipe mounting member 50 and the inner pipe mounting member 60 used when the apparatus main body 10 is installed.

  Further, the on-site water permeability test apparatus may be configured to include the knocking head 40 used when the apparatus main body 10 is driven.

  When the on-site permeability test apparatus configured as described above is installed, for example, it is performed as shown in FIGS.

  FIG. 6 is a schematic view showing an example of an installation method of the on-site permeability test apparatus according to the present invention, FIG. 7 is a front view of the apparatus main body 10 to which the knocking head 40 is attached, and FIG. FIG. 9 is an enlarged view of the main part of the fourth step (4), and FIG. 9 is an enlarged view of the main part of the fifth step (5) in FIG. In the case where the on-site permeability test apparatus according to the present invention is installed on the site, for example, it may be performed as shown in FIGS. 6 (1) to (6).

  First, as a first step, as shown in FIG. 6 (1), a dynamic penetration device (miniram sounding) RS is installed at a predetermined test position (see FIG. 6 (2)), and the dynamic penetration device RS. Using the rod (not shown), the preceding penetration hole RH is formed up to the permeability test section Z while measuring the N value of the ground (the test result for obtaining the strength of the ground obtained by the standard penetration test). In addition, you may abbreviate | omit the process of creating the said advance penetration hole RH, and may start from the following 2nd process.

  Next, as a second step, as shown in FIG. 7, a device in which the knocking head 40 is screwed into the upper portion of the apparatus main body 10 and is fixed in advance as shown in FIG. 6 (2). It is driven up to the water permeability test section Z along the penetration hole RH. At that time, if necessary, placing the joint outer pipe 200 and the joint inner pipe 300 is performed until the tip of the inner pipe 30 reaches the lower end of the water permeability test section Z.

  When the distal end of the inner pipe 30 reaches the lower end of the water permeability test section Z, as a third step, the dynamic penetration device RS is removed as shown in FIG. The joint inner tube 300 is screwed and fixed so that the upper end of the inner tube 30 is positioned above the upper end of the outer tube 20 to secure a lifting allowance for the outer tube 20.

  Next, as a fourth step, as shown in FIG. 6 (4), a tripod TP is installed, a chain block CB is attached to the tripod TP, and the outer tube mounting member 50 is screwed into the upper portion of the outer tube 20. The inner tube mounting member 60 is screwed and fixed to the upper portion of the inner tube 30. Then, as shown in FIG. 8, a pair of shackles SK, SK through which the metal wire WR is passed are connected to the connection ring 63 of the inner pipe mounting member 60, and the metal wire WR is connected to the pair of ropes 54, 54 is connected to the chain block CB.

  Next, as a fifth step, the metal wire WR is pulled up by the chain block CB. At this time, as shown in detail in FIG. 9, the outer tube mounting member 50 is applied with an upward force, and the inner tube mounting member 60 is applied with a downward force. 50 is pulled upward by utilizing the reaction force of the inner tube mounting member 60. On the other hand, since a force is applied downward to the inner tube mounting member 60, the inner tube mounting member 60 is not lifted together when the outer tube mounting member 50 is pulled upward. The state located in the water permeability test section Z can be maintained.

  Then, as a sixth step, as shown in FIG. 6 (6), in the state in which the outer pipe 20 is pulled up until the water-permeable partition portion Q of the inner pipe 30 is exposed, the joint pipe that secures the lifting allowance. 300 is removed, and a predetermined test is performed by inserting a device necessary for a predetermined test, such as a water level gauge, a water injection hose, etc., up to the water permeable section Q. Examples of the test include, but are not limited to, a constant water level water injection / permeation test and a water level observation test according to the E-19 method, and the test can be used for, for example, collecting groundwater. .

  And when withdrawing the said field permeation test apparatus, it carries out as FIG.10 and FIG.11 shows, for example.

  FIG. 10 is a schematic view showing an example of a method for withdrawing the in-situ permeability test apparatus according to the present invention, and FIG. 11 is an enlarged view of a main part of the second step (2) in FIG.

  First, as shown in FIG. 10A, if necessary, the joint inner pipe 300 is added and set so that the inner pipe 30 is positioned above the outer pipe 20.

  Next, as shown in FIG. 10 (2), the inner pipe mounting member 60 is screwed and fixed to the upper part of the inner pipes 30 and 300. Then, as shown in FIG. 11, the shackle SK through which the metal wire WR is passed is connected to the connection ring 63 of the inner tube mounting member 60, and the metal wire WR is connected to the chain block CB.

  Then, as shown in FIG. 10 (3), as the third step, the metal wire WR is pulled up with the metal wire WR connected to the chain block CB. At the time of this pulling up, first, the inner pipes 30 and 300 are pulled up together with the inner pipe mounting member 60, and the driving diameter connected to the inner pipe 30 as shown in FIG. 10 (3). The metal wire WR is further pulled upward while the large portion 37 is in contact with the lower end surface of the outer tube 20, and both the inner tubes 30 and 300 and the outer tubes 20 and 200 are pulled upward.

  When the outer pipe 20 and the inner pipe 30 are connected by the joint outer pipe 200 and the joint inner pipe 300, the second step (2) and the third step (3) in FIG. 10 are performed. The operation is repeated until all of the outer tubes 20 and 200 and the inner tubes 30 and 300 are pulled up, as shown in FIG. 10 (4).

  12 is a front view showing another outer pipe mounting member 70, and FIG. 13 is a front view showing another outer pipe mounting member 80. As shown in FIG. Of the components of the outer tube mounting member 70 and the outer tube mounting member 80, the same components as those of the outer tube mounting member 50 are denoted by the same reference numerals, and description thereof is omitted.

  The outer pipe mounting member 70 shown in FIG. 12 is configured so that the knocking head 45 can be directly mounted on the outer pipe mounting member 70, and the female thread portion 43 of the knocking head 45 is placed on the upper part of the main body 71 formed of a steel pipe. A male threaded portion 72 is formed, and a cylindrical relief opening 73 is formed between the male threaded portion 72 and the female threaded portion 52 so that the distal ends of the inner tubes 30 and 300 can enter. . According to the outer pipe mounting member 70, it is only necessary to remove the knocking head 45 when pulling up the outer pipe 20 at the time of installation, and the trouble of replacing the outer pipe mounting member 70 can be saved.

  The outer tube mounting portion 80 shown in FIG. 13 includes a connecting portion 82 formed of a pair of substantially U-shaped round steel materials on the upper outer periphery of a main body 81 formed of a steel tube having the same diameter as the outer tubes 20 and 200. 82 is fixed in an annular shape so that the tip is inclined obliquely outward. The outer tube mounting member 70 has a simple structure and can be manufactured at a low cost.

  Since the on-site permeability test apparatus according to the present invention has the above-described configuration, the inner pipe 30 is driven into the desired permeability test section Z in a state where the permeability section Q of the inner pipe 30 is protected by the outer pipe 20. Then, the outer tube 20 can be easily pulled out while the inner tube 30 is securely positioned in the water permeability test section Z, and the water-permeable partition portion Q can be reliably positioned in the water permeability test section Z.

  In addition, since the inner tube 30 can be inserted into the main body 51 of the outer tube mounting member 50, the outer tube mounting member 50 ( 70, 80) can be attached to the outer tube 20, and a cord-like body such as a metal wire WR is wound around the ropes 54, 54 (linking portions 82, 82), so that the inner tube The outer wire 20, 200 can be pulled up by easily connecting the metal wire WR to the connecting ring 63 of the mounting member 60.

  Moreover, in the installation method of the on-site permeability test apparatus according to the present invention, the inner pipes 30 and 300 are connected to the desired permeability test section Z in a state in which the permeability section Q of the inner pipe 30 is protected by the outer pipe 20. Then, the outer pipes 20 and 200 are easily pulled out while the inner pipes 30 and 300 are securely positioned in the water permeability test section Z, and the water permeation section Q is surely inserted into the water permeability test section Z. Can be positioned.

  Moreover, in the withdrawal method of the on-site permeability test apparatus according to the present invention, the inner pipes 30 and 300 and the outer pipes 20 and 200 can be easily pulled out and withdrawn.

  In addition, it may replace with the connection part comprised by the said rope 54,54, and you may comprise so that connection parts, such as a guide groove formed in the curved shape etc. which guide the said metal wires WR, may be provided.

DESCRIPTION OF SYMBOLS 10 Field permeability test apparatus main body 20 Outer pipe 21 Steel pipe 22, 23 Male thread part 24 Outer pipe lower end head 25 Female thread part 26 O-ring

30 Inner pipe 31 Stainless steel pipes 32, 33 Male threaded part 34 Tip sharpened part 35 Female threaded part 36 Tip part 37 Large diameter portion for driving 38 Water-permeable hole

200 Joint outer pipe 300 Joint inner pipe

40 knocking head 41 knocking head main body 42 hitting part 43 female threaded part 44 escape opening 45 other knocking head

50 Outer pipe mounting member 51 Outer pipe mounting member main body 52 Female thread portion 53 Bracket 54 Rope

60 Inner tube mounting member 61 Inner tube mounting member main body 62 Female thread portion 63 Connecting ring

70 Other outer pipe mounting member 71 Outer pipe mounting member main body 72 Male thread portion 73 Relief opening

80 Other outer pipe mounting member 81 Outer pipe mounting member main body 82 Connecting portion

Q Permeable section Z Permeability test section RS Miniram sounding CB Chain block TP Tripod WR Metal wire

Claims (4)

An outer tube that is driven into the ground to form an inner tube insertion hole;
An inner tube that is inserted into and retracted into the outer tube, and
A plurality of small-diameter water-permeable holes formed in the lower peripheral wall of the inner pipe,
A sharp tip fixed to the tip of the inner tube,
The sharp tip is an outer percussion surface formed to receive a striking force transmitted from the lower end of the outer tube;
A water stop portion formed to slide in the lower inner side of the outer tube with respect to the water-permeable partition portion and prevent water from entering the outer tube;
An on-site permeability test device having
An outer tube mounting member for pulling up an outer tube, having an insertion portion through which the inner tube is inserted and a connecting portion that is connected to a cord-like body that pulls the outer tube upward, and is detachably fixed to an upper portion of the outer tube When,
An inner pipe mounting member fixed to the upper part of the inner pipe and detachably, having a connecting part connected to the cord-like body via the connecting part of the outer pipe;
When the outer pipe is pulled up to expose the water permeable partition portion, the outer pipe mounting member attached to the outer pipe is positioned below the inner pipe mounting member attached to the inner pipe, and The body is connected to the connecting portion of the inner tube mounting member via the connecting portion of the outer tube mounting member, and the pulling force that pulls up the cord-like body upwards, and the pulling up force field permeability testing apparatus of the inner tube which is generated on the basis of the force by generating a press under gel force downwards, characterized in that pulling the outer tube. The outer tube mounting member is
A cylindrical outer tube mounting member main body through which the inner tube can be inserted;
An in-situ water permeability test according to claim 1, further comprising: a rope that is rotatably supported between brackets that project radially outward from the outer pipe mounting member main body. apparatus.
The inner pipe mounting member is
An inner tube mounting member main body having the same diameter as the inner tube;
The on-site water permeability test apparatus according to claim 1, further comprising: a connecting ring provided at an upper end of the inner pipe mounting member.
Insert the inner tube with the sharp tip fixed to the outer tube, hit the upper part of the outer tube with the outer tube in contact with the outer striking surface, and bring it into the ground to the desired depth. The process of driving,
Fixing the outer tube mounting member and the inner tube mounting member to the outer tube and the inner tube, respectively, in a state where the inner tube protrudes upward from the outer tube;
Connecting one end of the cord-like body to the connecting portion of the inner pipe, connecting the other end to the connecting portion, and connecting to the lifting device;
The pulling device is lifted by the lifting device, and the outer tube is lifted while the inner tube is pressed downward to expose the water permeable partition portion. 5. The installation method of the in-situ permeability test apparatus described in 1.

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