JP2009097155A - Opening cut-off device, elastic body for the opening cut-off device, and manufacturing method for the elastic body for the opening cut-off device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an elastic body for the opening cut-off device capable of not only achieving excellent workability but also preventing the deterioration of water cut-off effect due to its breakage. <P>SOLUTION: This elastic body 20 is incorporated into the opening cut-off device to cut off water by sealing a section between a hole drilling rod 50 for drilling a hole in the ground and an opening of an external pipe 51 guiding the hole drilling rod 50. This elastic body 20 has a cylindrical shape allowing the hole drilling rod 50 to pass through it, has an upper face 21a and a lower face 21b which are gradually and downward inclined toward an inner peripheral side, protrudes onto the inner peripheral side when it is pressed from above, and is pressed on an outer peripheral face of the hole drilling rod 50. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a mouth water stop device, an elastic body for a mouth water stop device, and a method for manufacturing an elastic body for a mouth water stop device. More specifically, a mouth water stop device for preventing earth, sand, water, and the like from being ejected from the hole mouth during drilling or drawing, an elastic body incorporated in the mouth water stop device, and the elastic body It relates to a manufacturing method.

  In anchor construction such as ground anchors, drilling with a drilling machine is performed to build anchors. Further, in the case of horizontal excavation such as tunnel excavation, for the purpose of stabilizing the face and reducing water permeability, drilling is performed by a drilling machine in order to improve the ground in front of or around the tunnel face by injecting chemicals. Further, in order to eliminate the influence on the surrounding buildings in the root cutting work, drilling by a drilling machine is also performed in order to improve the ground by injecting a chemical solution into the back portion of the retaining sheet pile or retaining wall.

  Conventionally, when drilling with a drilling rod through an outer tube in the ground under the influence of underwater pressure, that is, under the influence of groundwater pressure, there has been a problem that water, earth and sand, etc. are ejected from the drilling hole. . In order to prevent the ground condition of the target ground from deteriorating due to the eruption of soil and the like, and the adjacent injecting agent already injected from flowing out, a mouth water stopping device that stops water at the mouth of the outer pipe is proposed. (For example, refer to Patent Document 1).

  This mouth water stop device is provided with an annular packing holding frame having an inner peripheral portion opened at the mouth of an outer pipe, and a water stopping packing made of an annular soft elastic material is loaded in the packing holding frame. The outer peripheral portion is pressurized with a fluid such as air or liquid and bulges toward the inner peripheral side, whereby the outer peripheral portion is pressed against the drilling rod to stop water.

  However, in the above invention, air, water, oil or other fluid directly presses the outer peripheral portion of the water-stop packing, so that the airtightness is low. In the case of air, the density in the packing holding frame changes and is difficult to adjust. For this reason, there is a problem that the water-stopping property is poor, and it is difficult to arbitrarily adjust the pressing force with liquids such as water and oil, and the workability is poor.

  In view of this, the present inventor, as shown in Patent Document 2, allows a cylinder part to be supplied with air or liquid and a drilling rod to be penetrated, and from above and / or below by a piston member of the cylinder part. An annular elastic body that is pressed and has a hollow portion formed therein, and a holding portion that holds the elastic body, and the pressed elastic body bulges toward the inner peripheral side and the outer peripheral surface of the drilling rod The mouth water stop device characterized by the fact that it is configured to be crimped to the water is proposed. According to this water stop device at the mouth, water stoppage can be improved and the adjustment of the pressing force is easy, so the workability is excellent, and in particular, since the hollow portion is formed inside the elastic body, the pressing force Even if it is small, the elastic body can be easily bulged to the inner peripheral side, and this point also has the advantage of excellent workability.

However, this mouth water stop apparatus examined further improvement about the cyclic | annular elastic body integrated in the said apparatus.
That is, the elastic body is excellent in workability in the above-mentioned meaning because the hollow portion is formed inside, but the strength is relatively weak compared to the case where the hollow portion is not formed, and the usage frequency Depending on, for example, there is a possibility that the water stop effect cannot be obtained due to breakage during pressing. In addition, it is not easy to manufacture the hollow portion inside the annular elastic body.
JP 2001-20700 A JP 2007-169893 A

  The main problem to be solved by the present invention is that there is no fear that the water stop effect is not obtained due to breakage while being excellent in workability, and it is preferably easy to manufacture the elastic body for a water stop device, its manufacturing method, and the elasticity The object is to provide a mouth water stop device incorporating a body.

The present invention that has solved this problem is as follows.
[Invention of Claim 1]
A mouth water stop device for sealing water between a drilling rod for drilling a target ground and a mouth of an outer pipe that guides the drilling rod,
An upper elastic body that has a cylindrical shape that allows the drilling rod to pass therethrough and that has an upper surface and a lower surface that both incline downward toward the inner peripheral side, and a cylindrical shape that allows the drilling rod to pass through and has an upper surface and a lower surface. A lower elastic body that slopes upward as it goes toward the inner periphery, and
The upper elastic body and the lower elastic body are:
Arranged in a state where the inner peripheral portion of the lower surface of the upper elastic body and the inner peripheral portion of the upper surface of the lower elastic body are in contact with each other, and when pressed from at least one of the upper and lower sides, both protrude toward the inner peripheral side It is configured to be crimped to the outer peripheral surface of the drilling rod,
Mouth water stop device characterized by that.

[Invention of Claim 2]
A mouth water stop device for sealing water between a drilling rod for drilling a target ground and a mouth of an outer pipe that guides the drilling rod,
An upper elastic body that has a cylindrical shape that allows the drilling rod to pass therethrough and that has an upper surface and a lower surface that both incline downward toward the inner peripheral side, and a cylindrical shape that allows the drilling rod to pass through and has an upper surface and a lower surface. A lower elastic body that inclines upward as it goes toward the inner peripheral side, an upper holding member that has an upper flat plate portion and holds the upper elastic body, and a lower flat plate portion that holds the lower elastic body A lower holding member, and means for changing the distance from the lower holding member to the upper holding member,
The upper elastic body and the lower elastic body are:
A first inner portion between the lower surface of the upper elastic body and the upper surface of the lower elastic body as the inner peripheral portion of the lower surface of the upper elastic body comes into contact with the inner peripheral portion of the upper surface of the lower elastic body and toward the outer peripheral side. The gap widens, the outer peripheral portion of the upper surface of the upper elastic body and the lower surface of the upper flat plate portion abut, and the second gap between the upper surface of the upper elastic body and the lower surface of the upper flat plate portion becomes closer to the inner peripheral side. The third outer surface of the lower elastic body lower surface and the lower flat plate portion upper surface come into contact with the lower elastic plate lower surface and the lower flat plate upper surface, and the inner elastic surface is formed between the lower elastic body lower surface and the lower flat plate upper surface. When the gap is widened and the distance from the lower holding member to the upper holding member is shortened, the first to third gaps are narrowed, and both the upper elastic body and the lower elastic body are inside. It is configured to protrude to the peripheral side and to be crimped to the outer peripheral surface of the drilling rod.
Mouth water stop device characterized by that.

[Invention of Claim 3]
A drilling rod for drilling a target ground, and an elastic body incorporated in a mouth water stop device that seals between the mouth of an outer pipe that guides the drilling rod and stops water,
It is a cylindrical shape that can penetrate the drilling rod, and the upper surface and the lower surface are both inclined downward or upward as they go to the inner peripheral side, and when pressed from at least one of the upper and lower sides, the inner periphery It is configured to protrude to the side and crimp to the outer peripheral surface of the drilling rod,
An elastic body for a mouth water stop device.

[Invention of Claim 4]
A method for producing an elastic body incorporated in a mouth water stop device for sealing water between a drilling rod for drilling a target ground and a mouth of an outer pipe that guides the drilling rod. ,
Prepare a cylindrical member capable of penetrating the drilling rod, and cut the upper and lower surfaces of this member so as to incline to the lower side or to the upper side as they go to the inner peripheral side. And when pressed from at least one of the lower side, it projects to the inner peripheral side and is configured to be crimped to the outer peripheral surface of the drilling rod,
The manufacturing method of the elastic body for mouth water stop apparatuses characterized by the above-mentioned.

  According to the present invention, while having excellent workability, there is no fear that the water stop effect will not be obtained due to breakage, and the elastic body for a mouth water stop device that is easy to manufacture, its manufacturing method, and the mouth water stop incorporating the elastic body It becomes a device.

Next, an embodiment of the present invention will be described.
The mouth water stop device according to this embodiment has an outer pipe 51 that guides a drilling rod 50 that drills a target ground, as shown in FIG. 1 in a non-water stop state and in FIG. 2 in a water stop state. It attaches to the mouth part of this, and seals between the hole part of the drilling rod 50 and the outer pipe | tube 51, and aims at water stop. This mouth water stop device includes a cylinder portion 10 that is a means for changing a distance from a lower holding member 32 to an upper holding member 31 described later, an elastic body 20 that is pressed by the cylinder portion 10, and the elastic body 20. Holding part 30 to hold.

  The cylinder portion 10 has an annular shape that allows the drilling rod 50 to pass therethrough, and an inner peripheral wall 11 provided with a flange 11A at the upper end, and an outer peripheral portion of the flange 11A that is coaxially disposed on the outer peripheral side of the inner peripheral wall 11 And an outer peripheral wall 12 connected to. In addition, a cylindrical cylindrical body 33 is provided on the inner peripheral side of the outer peripheral wall 12, and a cylinder chamber 13 is formed between the cylindrical body 33 and the inner peripheral wall 11. An annular piston member 14 is slidably provided in the cylinder chamber 13 in the vertical direction.

  The flange 11 </ b> A of the inner peripheral wall 11 constitutes the upper wall of the cylinder chamber 13. A supply pipe 16 that communicates with the cylinder chamber 13 and supplies fluid such as air or liquid such as water or oil is attached to the flange 11A of the inner peripheral wall 11 via a connector 16A. (Not shown) or a fluid supplied from a pump (not shown) is sent from the supply pipe 16 into the cylinder chamber 13 through a pipe line (not shown), and the piston member 14 is pushed downward by the fluid. As shown in FIG. 2, an elastic body 20 to be described later is pressed downward.

  In the conventional mouth water stop device, it was necessary to always apply pressure with a compressor or a pump during drilling work due to low airtightness, etc. In addition, it is easy to adjust the pressing force and is excellent in workability. In particular, by providing a highly airtight cylinder chamber 13 and pressing the elastic body 20 with the piston member 14, during drilling work, a valve (not shown) provided in the middle of the pipeline can be tightened. Therefore, it is not necessary to always apply pressure with a compressor or a pump, and the elastic body 20 can be pressure-bonded to the outer peripheral surface of the drilling rod 50, so that workability is excellent.

  The piston member 14 is an annular member, and as shown in FIGS. 1 and 2, the annular cross section has a substantially inverted L shape, and the reduced outer diameter portion 14 </ b> A is formed on the flange 11 </ b> A of the inner peripheral wall 11. It comes to contact.

  The elastic body 20 of this embodiment is composed of a cylindrical upper elastic body 21 and a lower elastic body 22 that can penetrate the drilling rod 50. As shown in (1) of FIG. 3, the upper elastic body 21 is inclined downward as the upper surface 21a and the lower surface 21b move toward the inner peripheral side. Further, the lower elastic body 22 is inclined upward as the upper surface 22a and the lower surface 22b move toward the inner peripheral side.

  On the other hand, the holding unit 30 of this embodiment includes an upper holding member 31 that holds the upper elastic body 21 and a lower holding member 32 that holds the lower elastic body 22. The upper holding member 31 circumscribes the upper end portion of the upper elastic body 21 and is inscribed in the cylindrical body 33 described above, and a record board extending from the upper end portion of the upper cylindrical portion 31B to the inner peripheral side The upper plate portion 31A has a substantially L-shaped cross section. The lower holding member 32 circumscribes the lower end portion of the lower elastic body 22 and is inscribed in the cylindrical body 33 described above, and the lower cylindrical portion 32B from the lower end portion to the inner peripheral side. And a lower flat plate portion 32A extending in the form of a record board, and having a substantially L-shaped cross section.

In the mouth water stop device of the present embodiment configured as described above, the upper elastic body 21 and the lower elastic body 22 are incorporated in a state of being arranged as described below.
That is, as shown in FIG. 3, first, the inner peripheral portion of the upper elastic body lower surface 21b and the inner peripheral portion of the lower elastic body upper surface 22a are in contact with each other, and the upper elastic lower surface 21b and the lower side are moved toward the outer peripheral side. It arrange | positions so that the 1st clearance gap C1 between the elastic body upper surfaces 22a may be in the widened state. Further, the outer peripheral portion of the upper elastic body upper surface 21a and the lower surface 31a of the upper flat plate portion 31A are in contact with each other, and the second gap C2 between the upper elastic body upper surface 21a and the upper flat plate portion lower surface 31a as it goes toward the inner peripheral side. Are arranged so as to be spread. Further, the outer peripheral portion of the lower elastic body lower surface 22b and the upper surface 32b of the lower flat plate portion 32A are in contact with each other, and the second elastic body lower surface 22b and the lower flat plate portion upper surface 32b are moved toward the inner peripheral side. 3 is arranged so that the gap C3 of 3 is widened.

  When the upper elastic body 21 and the lower elastic body 22 are pressed from at least one of the upper side and the lower side, particularly in this embodiment, the cylinder part 10 is operated as described above (fluid is supplied to the piston member). 14), when the distance from the lower holding member 32 to the upper holding member 31 decreases as the upper holding member 31 moves downward, it is shown in FIG. 2 or (2) in FIG. Thus, the first to third gaps C1 to C3 are narrowed, and preferably the first to third gaps C1 to C3 are not present, so that both of the upper elastic body 21 and the lower elastic body 22 have an inner circumference. It protrudes to the side and is configured to be crimped to the outer peripheral surface of the drilling rod 50. This pressure bonding provides a water stop effect.

  In this embodiment, since the hollow portion is not formed inside the elastic body 20 and the strength does not become relatively weak, there is a problem that the water stop effect cannot be obtained due to breakage caused by a decrease in strength. Does not occur. Moreover, even if one of the upper elastic body 21 and the lower elastic body 22 is damaged, the water stop effect is maintained by the other upper elastic body 21 or the lower elastic body 22, so that the water stop effect may not be obtained. Sex is extremely small. Furthermore, in this embodiment, even if the hollow portion is not formed inside the elastic body 20, since the first to third gaps C1 to C3 are provided, the elastic bodies 21 and 22 can be easily inserted with a small pressing force. It can be protruded to the circumferential side. In particular, if the first to third gaps C1 to C3 do not exist by pressing, the density change at the time of pressing disappears, and the elastic bodies 21 and 22 protruding to the inner peripheral side and the drilling rod 50 Adhesion is improved. In addition, in this embodiment, since it is not necessary to form a hollow part inside the elastic body 20, it is easy to manufacture. Specifically, for example, a cylindrical member (elastic body) capable of penetrating the drilling rod 50 is prepared, and the upper surface and the lower surface of this member are both lowered toward the inner peripheral side, or both Manufacture can be performed only by notching so as to incline upward. In the mouth water stop device of the present embodiment, the only difference between the upper elastic body 21 and the lower elastic body 22 is that the arrangement direction is upside down. Therefore, the elastic body manufactured by the manufacturing method is appropriately turned upside down. If incorporated, the upper elastic body 21 or the lower elastic body 22 is obtained.

[Others]
(1) In this embodiment, the upper side 21a and lower side 21b of the upper elastic body 21 and the lower side or upper side of the upper side 22a and lower side 22b of the lower elastic body 22 are also referred to as tilt angles (hereinafter also simply referred to as “tilt angles”). ) Is not particularly limited. However, taking the case of the upper elastic body 21 as an example, as shown in FIG. 3 (1), it is preferable that the inclination angle α of the upper surface 21a and the inclination angle β of the lower surface 21b are the same. If the inclination angle α and the inclination angle β are the same, the stability when the upper elastic body 21 is pressed and pressed against the outer peripheral surface of the drilling rod 50 is excellent.

(2) In this embodiment, if the inclination angle such as the inclination angle α or the inclination angle β is increased, the amount of protrusion of the elastic bodies 21 and 22 toward the inner peripheral side increases. Therefore, the adhesion strength of the elastic bodies 21 and 22 to the drilling rod 50 can be adjusted by appropriately adjusting the inclination angle.

(3) In the present embodiment, the elastic body 20 is configured by one upper elastic body 21 and one lower elastic body 22, but the present invention is not limited to this form. A plurality of upper elastic bodies 21 and lower elastic bodies 22 may be prepared, and the upper elastic bodies 21 or the lower elastic bodies 22 may be alternately arranged in the vertical direction. However, from the viewpoint of stability of the incorporated elastic body 20, it is preferable that there is one upper elastic body 21 and one lower elastic body 22.

(4) In the present embodiment, the material of the elastic bodies 21 and 22 is not particularly limited as long as the elastic bodies 21 and 22 are elastic enough to be in close contact with the drilling rod 50 and obtain a water stop effect. Specifically, for example, a soft resin such as rubber or a plastic resin such as urethane or Teflon (registered trademark) can be used.

(5) In this embodiment, the inner peripheral surfaces of the elastic bodies 21 and 22 can be deformed into various shapes. Specifically, for example, a tooth-shaped groove or a saw-shaped groove can be formed on the inner peripheral surface, or a gentle depression (concave portion) can be formed. With these deformed shapes, the pressure-bonding area with the drilling rod 50 can be reduced, the frictional resistance caused by the rotation of the drilling rod 50 can be reduced, and the water can be stopped without deteriorating the drilling efficiency.

(6) The mouth water stop device of the present embodiment has a configuration in which the cylinder portion 10 is located at the upper portion and the holding portion 30 that holds the elastic body 20 is located therebelow. However, the holding portion 30 is positioned at the upper portion, the cylinder portion 10 is positioned therebelow, a fluid is supplied from below to raise the piston member 14, and the elastic body 20 is pressed from below to project to the inner peripheral side. It may be configured. Moreover, the cylinder part 10 may be provided above and below the holding part 30, respectively, and the elastic body 20 may be pressed from above and below.

(7) The mouth water stop device of the present embodiment can be used both when the drilling direction is the downward direction and when it is the horizontal direction. Therefore, in this specification, “upper” means the front side in the drilling direction, and “lower” means the rear side in the drilling direction.

  The present invention relates to a mouth water stop device for preventing discharge of earth, sand, water, and the like from a hole opening at the time of drilling or drawing, an elastic body incorporated in the mouth water stop device, and the elastic body It is applicable as a manufacturing method.

It is sectional drawing of a mouth water stop apparatus (at the time of non-water stop). It is sectional drawing of a mouth water stop apparatus (at the time of water stop). It is a figure for demonstrating a motion of an elastic body.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Cylinder part, 11 ... Inner peripheral wall, 11A ... 鍔, 12 ... Outer peripheral wall, 13 ... Cylinder chamber, 14 ... Piston member, 16 ... Supply pipe, 20 ... Elastic body, 21 ... Upper elastic body, 22 ... Lower elastic body Body, 30 ... holding part, 31 ... upper holding member, 31A ... upper flat plate part, 32 ... lower holding member, 32A ... lower flat plate part, 50 ... drilling rod, 51 ... outer tube.

Claims (4)

A mouth water stop device for sealing water between a drilling rod for drilling a target ground and a mouth of an outer pipe that guides the drilling rod,
An upper elastic body that has a cylindrical shape that allows the drilling rod to pass therethrough, and that has an upper surface and a lower surface that both incline downward as it goes toward the inner periphery. A lower elastic body that slopes upward as it goes toward the inner circumference side,
The upper elastic body and the lower elastic body are:
Arranged in a state where the inner peripheral portion of the lower surface of the upper elastic body and the inner peripheral portion of the upper surface of the lower elastic body are in contact with each other, and when pressed from at least one of the upper and lower sides, both protrude toward the inner peripheral side. It is configured to be crimped to the outer peripheral surface of the drilling rod,
Mouth water stop device characterized by that. A mouth water stop device for sealing water between a drilling rod for drilling a target ground and a mouth of an outer pipe that guides the drilling rod,
An upper elastic body that has a cylindrical shape that allows the drilling rod to pass therethrough, and that has an upper surface and a lower surface that both incline downward as it goes toward the inner periphery. A lower elastic body that inclines upward as it goes toward the inner peripheral side, an upper holding member that has an upper flat plate portion and holds the upper elastic body, and a lower flat plate portion that holds the lower elastic body A lower holding member, and means for changing the distance from the lower holding member to the upper holding member,
The upper elastic body and the lower elastic body are:
A first inner portion between the lower surface of the upper elastic body and the upper surface of the lower elastic body as the inner peripheral portion of the lower surface of the upper elastic body comes into contact with the inner peripheral portion of the upper surface of the lower elastic body and toward the outer peripheral side. The gap widens, the outer periphery of the upper surface of the upper elastic body and the lower surface of the upper flat plate portion abut, and the second gap between the upper surface of the upper elastic body and the lower surface of the upper flat plate portion becomes closer to the inner peripheral side. The third outer surface of the lower elastic body lower surface and the lower flat plate portion upper surface come into contact with the lower elastic plate lower surface and the lower flat plate upper surface, and the inner elastic surface is formed between the lower elastic body lower surface and the lower flat plate upper surface. When the gap is widened and the distance from the lower holding member to the upper holding member is shortened, the first to third gaps are narrowed, and both the upper elastic body and the lower elastic body are inside. It is configured to protrude to the peripheral side and be crimped to the outer peripheral surface of the drilling rod.
Mouth water stop device characterized by that. A drilling rod for drilling a target ground, and an elastic body incorporated in a mouth water stop device that seals between the mouth of an outer pipe that guides the drilling rod and stops water,
It is a cylindrical shape that can penetrate the drilling rod, and the upper surface and the lower surface are both inclined downward or upward as they go to the inner peripheral side, and when pressed from at least one of the upper and lower sides, the inner periphery It is configured to protrude to the side and crimp to the outer peripheral surface of the drilling rod,
An elastic body for a mouth water stop device. A method for producing an elastic body incorporated in a mouth water stop device for sealing water between a drilling rod for drilling a target ground and a mouth of an outer pipe that guides the drilling rod. ,
Prepare a cylindrical member capable of penetrating the drilling rod, and cut the upper and lower surfaces of this member so as to incline to the lower side or to the upper side as they go to the inner peripheral side. And when pressed from at least one of the lower side, it projects to the inner peripheral side and is configured to be crimped to the outer peripheral surface of the drilling rod,
The manufacturing method of the elastic body for mouth water stop apparatuses characterized by the above-mentioned.

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