JP2014219014A - Water stop device for expansion pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water stop device for an expansion pipe, which is enabled to retain a predetermined water stop function by a simple construction.SOLUTION: A water stop device 1 for stopping water between the inner face of a building frame water passage 5 formed in the side wall 3 of a game chamber G and the end part outer face of an extendible pipe 12 to be inserted from the gate chamber G into the building frame water passage 5. The water stop device 1 comprises: a flange 15 formed at the end part of the extendible pipe 12; a water stop member 16 interposed between the inner face of the building frame water passage 5 and the outer face of the extendible pipe 12; and pressing means 17 composed of a rod driving part 20 or the like for pushing the water stop member 16 onto the flange 15. The water stop member 16 is elastically deformed by receiving a pressing reaction force from the flange 15, thereby to cut off the water between the inner face of the building frame water passage 5 and the outer face of the extendible pipe 12.

Description

  The present invention relates to a water stop device for an expansion tube.

  When installing a new gate in a gate room or replacing a gate in a sewer, etc., a technique for connecting an upstream body water channel and a downstream body water channel facing the gate room with an extension pipe is known (for example, Patent Documents). 1).

  Patent Document 1 describes a technique of providing a sealing member for water stop between each inner surface of an inlet (upstream housing water channel) and an outlet (downstream housing water channel) and an outer surface of an expansion tube. It is described that this sealing member is constituted by an airbag.

JP 2001-323444 A

  However, the technique described in Patent Document 1 requires a compressor to inflate the airbag. In addition, since air bags are likely to cause air leakage even with a few scratches, there is a problem that usability is slightly inferior, for example, sufficient care is required for handling in field work.

  The present invention was created to solve the above-described problems, and is not limited to a conventional water-stop method using an air bag. The object is to provide a device.

  In order to solve the above-mentioned problem, the present invention provides a water stop for stopping water between an inner surface of a housing water channel perforated in a side wall of a gate chamber and an outer surface of an end portion of a telescopic pipe inserted from the gate chamber into the housing water channel. An apparatus, a flange formed at an end of the expansion tube, a water stop member made of an annular elastic body provided between an inner surface of the housing water channel and an outer surface of the expansion tube, and the water stop member Pressing means for pressing the flange against the flange, and the water stop member elastically deforms in response to the pressing reaction force from the flange, whereby the water stop between the inner surface of the enclosure water channel and the outer surface of the telescopic tube is stopped. It is characterized by being.

  According to this water stop device, there is no problem of air leakage due to scratches as in the conventional water stop method using an air bag, and the water stop device has a simple structure. The water stop function can be secured.

  In the present invention, the expansion / contraction portion of the expansion / contraction tube has a double tube structure, and includes an expansion / contraction portion water stop mechanism for stopping water between the inner surface of the outer tube of the expansion / contraction portion and the outer surface of the inner tube. The water stop mechanism includes a stretchable portion flange formed at an end of the inner tube, a stretchable portion waterstop member made of an annular elastic body provided between the inner surface of the outer tube and the outer surface of the inner tube, An expansion / contraction portion pressing means that presses the expansion / contraction portion water-stopping member against the expansion / contraction portion flange, and is configured to elastically deform the expansion / contraction portion water-stopping member in response to a pressing reaction force from the expansion / contraction portion flange. The space between the inner surface of the outer tube and the outer surface of the inner tube in the expansion / contraction part is characterized by being stopped.

  According to the water stop device provided with the expansion / contraction part water stop mechanism, the water stop function can be secured with a simple structure even in the expansion / contraction part of the expansion / contraction tube.

  According to the present invention, the pressing means includes a pressing rod disposed along the axial direction of the expansion / contraction tube outside the expansion / contraction tube, and an annular pressing tip that is provided at one end of the pressing rod and is in contact with the water stop member. It is characterized by comprising a member and a rod drive part for advancing and retracting the pressing rod.

  According to this water stop device, the water stop function can be secured by elastically deforming the water stop member with a simple structure and without much labor.

  Further, the present invention is characterized by including an expansion / contraction device for expanding / contracting the expansion / contraction tube, and the expansion / contraction device also serves as the pressing means.

  According to this water stop device, since the expansion / contraction device that expands / contracts the expansion / contraction tube also serves as the pressing means for water stop, the number of parts is reduced, the water stop work is simplified, and the production cost can be reduced.

  According to the present invention, water can be stopped with a simple structure between the inner surface of the housing water channel and the outer surface of the end of the telescopic tube inserted into the housing water channel.

It is a side view of the water stop apparatus concerning a 1st embodiment. It is the external appearance perspective view of a part of water stop device concerning a 1st embodiment, and the external appearance perspective view of an expansion and contraction multiple tube. It is an effect | action figure of the water stop apparatus which concerns on 1st Embodiment. It is a side view of the water stop apparatus which concerns on 2nd Embodiment. It is an effect | action figure of the water stop apparatus which concerns on 2nd Embodiment. It is a side view of the water stop apparatus which concerns on 3rd Embodiment. It is an effect | action figure of the water stop apparatus which concerns on 3rd Embodiment.

“First Embodiment”
In FIG. 1, the gate chamber G is formed as a substantially rectangular space by a frame 2 constructed of concrete or the like. On the opposite side walls 3 and 4 of the gate chamber G, for example, skeleton water channels 5 and 6 made of a sewer are perforated. The cross-sectional shape of the housing water channels 5 and 6 is, for example, a square shape or a circular shape. A gate (water control door) 7 is attached to one side wall 3. The gate 7 includes, for example, a square frame-like door-to-door frame 8 attached to the housing 2 and a door body 9 that is guided by the door-to-door frame 8 and opens and closes depending on the degree of opening and closing of the door body 9. This is a gate having a known structure for adjusting the flow rate, and a detailed description thereof is omitted from the gist of the present invention.

  The telescopic tube 12 is used for communicating between the body water channels 5 and 6. While draining sewage through the telescopic pipe 12, the gate 7 is newly installed after draining the sewage remaining in the gate chamber G with a drain pump (not shown) or the like, or the existing gate 7 Replace or inspect.

  The telescopic tube 12 includes an outer tube 13 and an inner tube 14. The telescopic tube 12 is made of a tube material such as resin or metal, and its cross-sectional shape is appropriately selected according to the cross-sectional shape of the housing water channels 5 and 6. In this embodiment, since the cross-sectional shape of the housing water channels 5 and 6 is a square shape, as shown in FIG. 2, the outer tube 13 and the inner tube 14 are each comprised from the square tube.

  The water stop device 1 according to the present invention includes at least one inner surface of the housing water channels 5 and 6 perforated in the side walls 3 and 4 of the gate chamber G, and the telescopic tube 12 inserted from the gate chamber G into the housing water channels 5 and 6. Water is stopped between the outer surfaces. The water stop device 1 of the present embodiment also includes an expansion / contraction portion water stop mechanism 10 that stops water between the inner surface of the outer tube 13 of the expansion / contraction portion of the expansion tube 12 and the outer surface of the inner tube 14. The water stop device 1 of the present embodiment stops water “(1) between the inner surface of the housing water channel 5 and the outer surface of the inner tube 14” and “(2) the outer tube 13 by the expansion / contraction portion water stop mechanism 10. Between the inner surface of the inner tube 14 and the outer surface of the inner tube 14.

“(1) Water stop structure between the inner surface of the enclosure water channel 5 and the outer surface of the inner pipe 14”
The water stop device 1 includes a flange 15 formed at an end of the inner pipe 14, a water stop member 16 formed of an annular elastic body provided between the inner surface of the housing water channel 5 and the outer surface of the inner pipe 14, Pressing means 17 for pressing the water member 16 against the flange 15.

  The flange 15 extends in the radially outward direction at the end of the inner pipe 14 inserted into the housing water channel 5. The water stop member 16 is disposed so as to be fitted onto the inner tube 14 before the flange 15. The water stop member 16 is made of a rubber material or the like, and is attached to a pressing tip member 19 described later. The pressing means 17 includes a pressing rod 18 disposed along the axial direction of the inner tube 14 outside the inner tube 14, an annular pressing tip member 19 provided at one end of the pressing rod 18 and in contact with the water stop member 16. And a rod driving unit 20 for moving the pressing rod 18 back and forth. A plurality of pressing rods 18 (two in this embodiment as shown in FIG. 2) are arranged. The rod drive unit 20 may be a known actuator such as a cylinder.

“(2) Water stop structure between the inner surface of the outer tube 13 and the outer surface of the inner tube 14”
The expansion / contraction portion water stop mechanism 10 includes an expansion / contraction portion flange 22 formed at the end of the inner tube 14, and an expansion / contraction portion stop formed of an annular elastic body provided between the inner surface of the outer tube 13 and the outer surface of the inner tube 14. A water member 23 and expansion / contraction portion pressing means 21 for pressing the expansion / contraction portion water stop member 23 against the flange 22 are provided.

  The expansion / contraction portion flange 22 extends radially outward at the end of the inner tube 14 inserted into the outer tube 13. The expansion / contraction part water stop member 23 is disposed so as to be fitted on the inner tube 14 in front of the expansion / contraction part flange 22. The expansion / contraction part water stop member 23 is made of a rubber material or the like, and is attached to a pressing tip member 26 described later. The expansion / contraction portion pressing means 21 is provided on the outer side of the inner tube 14 along the axial direction of the inner tube 14, and at an end of the pressing rod 25, and is an annular pressure contact with the expansion / contraction portion water stop member 23. The distal end member 26 and a rod driving unit 27 for moving the pressing rod 25 forward and backward are provided. A plurality of pressing rods 25 (two in this embodiment as shown in FIG. 2) are arranged. As the rod driving unit 27, for example, the rod driving unit 20 is used. The pressing tip member 26 is formed with a rod connecting piece 28 extending in the radially outward direction. In FIG. 2, the rod connecting piece 28 is a plate-like piece, but it may be annular.

  Next, the telescopic device 29 that expands and contracts the telescopic tube 12 will be described. A flange 30 is formed at one end of the outer tube 13 so as to extend radially outward. On the outer surface of the outer tube 13, a main body of an actuator 31 as an extension device 29 is attached. The actuator 31 is, for example, a cylinder or the like, and is arranged such that its rod 32 advances and retreats along the axial direction of the telescopic tube 12. The tip of the rod 32 is connected to the rod connecting piece 28 of the pressing tip member 26. The flange 30 is applied to the side wall 4 of the gate chamber G through a water stop member 33 made of a rubber material or the like.

"Action"
First, as shown in FIG. 3A, the telescopic tube 12 in a state where the rod 32 of the actuator 31 is retracted and contracted is carried into the gate chamber G using a crane or the like. Next, as shown in FIG. 3B, the actuator 31 is driven to advance the rod 32, and the telescopic tube 12 is expanded. The outer pipe 13 communicates with the housing water channel 6 with the flange 30 being applied to the side wall 4 via the water stop member 33. One end of the inner tube 14 is inserted into the housing water channel 5 via the pressing means 17 when the rod connecting piece 28 is pressed by the rod 32.

  Up to this point, the pressing tip members 19 and 26 are not pressed with such a strong force that the water stop member 16 and the expansion / contraction portion water stop member 23 are deformed into the flange 15 and the expansion / contraction portion flange 22, respectively. 16. The expansion / contraction portion water-stop member 23 has not yet undergone predetermined elastic deformation. Therefore, the water stop member 16 and the expansion / contraction portion water stop member 23 do not rub against the inner surface of the housing water channel 5 and the inner surface of the outer tube 13, respectively, and the inner tube 14 extends smoothly with respect to the outer tube 13.

  Next, as shown in FIG. 3C, the rod driving unit 20 is driven to move the pressing rod 18 and the pressing rod 25 in directions away from each other. As a result, the pressing tip member 19 presses the water stop member 16 against the flange 15 on the pressing rod 18 side. The water-stop member 16 is pressed against the outer surface of the inner tube 14 by being elastically deformed toward the inner side of the inner tube 14, that is, the outer surface of the inner tube 14 in response to the pressing reaction force from the flange 15. By being elastically deformed toward the inner surface of the water channel 5, it is pressed against the inner surface of the housing water channel 5. Thereby, the space between the inner surface of the enclosure water channel 5 and the outer surface of the inner pipe 14 is stopped.

  On the side of the pressing rod 25, the pressing tip member 26 presses the expansion / contraction part water stop member 23 against the expansion / contraction part flange 22. The expansion / contraction portion water stop member 23 receives the pressing reaction force from the expansion / contraction portion flange 22 and is elastically deformed toward the inner side of the annular tube, that is, the outer surface of the inner tube 14. By being elastically deformed toward the outer side, that is, the inner surface of the outer tube 13, it is pressed against the inner surface of the outer tube 13. As a result, water is stopped between the inner surface of the outer tube 13 and the outer surface of the inner tube 14.

  Further, when the water stop member 16 is elastically deformed and is brought into pressure contact with the inner surface of the housing water passage 5, the inner pipe 14 is positioned in the axial direction with respect to the housing water passage 5 by the frictional force thereof. Therefore, when the pressure rod 18 and the pressure rod 25 are moved away from each other by the drive of the rod driving unit 20, the flange 30 of the outer cylinder 13 is pressed against the side wall 4, and the water stop member 33 is compressed. Thus, water is stopped between the housing water channel 6 and the outer pipe 13.

  When the predetermined work is finished and the telescopic tube 12 is removed from the housing water channel 5, the rod driving unit 20 is driven in the opposite direction to move the pressing rod 18 and the pressing rod 25 in the directions close to each other to stop the water stop member 16. The elastic deformation of the expansion / contraction water stop member 23 is loosened. When the rod 32 of the actuator 31 is retracted, the rod connecting piece 28 is pulled by the rod 32, whereby the inner tube 14 is inserted into the outer tube 13 through the expansion / contraction water stop mechanism 10, and the expansion / contraction tube 12. Can be removed from the body waterway 5.

  According to the water stop device 1 of the present invention, there is no problem that air leaks due to scratches as in the conventional water stop method using an air bag, and a predetermined water stop function is ensured even if handled somewhat on site. it can.

  Further, if the pressing means 17 includes the pressing rod 18, the pressing tip member 19, and the rod driving unit 20, the water stop member 16 can be elastically deformed with a simple structure and without much labor.

  In FIG. 1, the cross-sectional shape of the water stop member 16 and the expansion / contraction portion water stop member 23 is substantially U-shaped, but the cross-sectional shape of the water stop member 16 and the expansion / contraction portion water stop member 23 is not limited to this, Other shapes may be used as long as they can be elastically deformed by receiving the pressing reaction force from the stretchable portion flange 22.

Each cylinder may be expanded and contracted, and may be constituted by a hydraulic cylinder, an air cylinder, an electric cylinder or the like.
Further, the telescopic device 29 is not particularly limited to the actuator 31. For example, a seat plate is protruded from the outer surface of each of the outer tube 13 and the inner tube 14, and the outer tube 13 and the inner tube 14 are manually stretched, and then stretched by passing through between both seat plates and fixing them with nuts. You may make it hold | maintain a state.

“Second Embodiment”
With reference to FIG. 4, 2nd Embodiment of the water stop apparatus 1 is described. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. In the first embodiment, “(1) Between the inner surface of the enclosure water channel 5 and the outer surface of the inner tube 14” and “(2) Between the inner surface of the outer tube 13 and the outer surface of the inner tube 14” In addition to this, in the second embodiment, “(3) Between the inner surface of the housing water channel 6 and the outer surface of the outer pipe 13” is also stopped.

“(3) Water stop structure between the inner surface of the enclosure water channel 6 and the outer surface of the outer pipe 13”
The water stop device 1 includes a flange 30 formed at an end of the outer pipe 13, a water stop member 34 formed of an annular elastic body provided between the inner surface of the housing water channel 6 and the outer surface of the outer pipe 13, Pressing means 17 for pressing the water member 34 against the flange 15.

  The water stop member 34 is disposed so as to be fitted onto the outer tube 13 before the flange 30. The water stop member 34 is made of a rubber material or the like, and is attached to a pressing tip member 37 described later. The pressing means 17 includes a pressing rod 36 disposed along the axial direction of the outer tube 13 outside the outer tube 13, an annular pressing tip member 37 provided at one end of the pressing rod 36, and in contact with the water stop member 34. And a rod driving unit 38 for moving the pressing rod 36 back and forth. A plurality of pressing rods 36 are arranged. The rod drive unit 38 may be a known actuator such as a cylinder, like the rod drive unit 20. The base end of the rod 40 is attached to a seat plate 41 protruding from the outer surface of the outer tube 13. The expansion / contraction device 29 for expanding / contracting the expansion / contraction tube 12 includes an actuator 31 as in the first embodiment, and the main body of the actuator 31 is attached to a seat plate 41.

"Action"
As shown in FIG. 5A, the telescopic tube 12 in a state where the rod 32 of the actuator 31 is retracted and contracted is carried into the gate chamber G using a crane or the like. Next, as shown in FIG. 5B, the actuator 31 is driven to advance the rod 32, and the telescopic tube 12 is expanded. The outer tube 13 is inserted into the housing water channel 6, and the inner tube 14 is inserted into the housing water channel 5.

  Up to this point, the pressing tip members 19 and 26 are not pressed with such a strong force that the water stop member 16 and the expansion / contraction portion water stop member 23 are deformed into the flange 15 and the expansion / contraction portion flange 22, respectively. 16. The expansion / contraction portion water-stop member 23 has not yet undergone predetermined elastic deformation. Further, the pressing tip member 37 is not pressed with a force strong enough to deform the water stop member 34 into the flange 30, and the water stop member 34 has not yet undergone predetermined elastic deformation. Therefore, the water stop members 16 and 34 and the expansion / contraction portion water stop member 23 are not rubbed against the inner surface of the housing water channel 5, the inner surface of the housing water channel 6, and the inner surface of the outer tube 13, respectively. Stretches smoothly.

  Next, as shown in FIG. 5C, the rod driving unit 20 is driven to move the pressing rod 18 and the pressing rod 25 in directions away from each other. As a result, the pressing tip member 19 presses the water stop member 16 against the flange 15 on the pressing rod 18 side. The water-stop member 16 is pressed against the outer surface of the inner tube 14 by being elastically deformed toward the inner side of the inner tube 14, that is, the outer surface of the inner tube 14 in response to the pressing reaction force from the flange 15. By being elastically deformed toward the inner surface of the water channel 5, it is pressed against the inner surface of the housing water channel 5. Thereby, the space between the inner surface of the enclosure water channel 5 and the outer surface of the inner pipe 14 is stopped.

  On the side of the pressing rod 25, the pressing tip member 26 presses the expansion / contraction part water stop member 23 against the expansion / contraction part flange 22. The expansion / contraction portion water stop member 23 receives the pressing reaction force from the expansion / contraction portion flange 22 and is elastically deformed toward the inner side of the annular tube, that is, the outer surface of the inner tube 14. By being elastically deformed toward the outer side, that is, the inner surface of the outer tube 13, it is pressed against the inner surface of the outer tube 13. As a result, water is stopped between the inner surface of the outer tube 13 and the outer surface of the inner tube 14.

  Moreover, the rod drive part 38 is driven and the press rod 36 and the rod 40 are moved in the direction away from each other. As a result, the pressing tip member 37 presses the water stop member 34 against the flange 30. The water stop member 34 receives the pressing reaction force from the flange 30 and is elastically deformed toward the annular inner side, that is, the outer surface of the outer tube 13, thereby being pressed against the outer surface of the outer tube 13, and the annular outer side, that is, the casing. By being elastically deformed toward the inner surface of the water channel 6, it is pressed against the inner surface of the housing water channel 6. Thereby, the space between the inner surface of the enclosure water channel 5 and the outer surface of the inner pipe 14 is stopped.

  When the predetermined work is completed and the telescopic tube 12 is removed from the housing water channels 5 and 6, the rod driving unit 20 is driven in the opposite direction to move the pressing rod 18 and the pressing rod 25 in directions close to each other to stop the water. The elastic deformation of the member 16 and the expansion / contraction part water stop member 23 is loosened. Further, the rod driving unit 38 is driven in the opposite direction to move the pressing rod 36 and the rod 40 in directions close to each other, thereby loosening the elastic deformation of the water stop member 34. When the rod 32 of the actuator 31 is retracted, the rod connecting piece 28 is pulled by the rod 32, whereby the inner tube 14 is inserted into the outer tube 13 through the expansion / contraction water stop mechanism 10, and the expansion / contraction tube 12. Shrinks. Thereby, the expansion-contraction tube 12 can be removed from the housing water channels 5 and 6.

“Third Embodiment”
With reference to FIG. 6, 3rd Embodiment of the water stop apparatus 1 is described. In FIG. 6, the same components as those in the first embodiment or the second embodiment are denoted by the same reference numerals. The third embodiment is mainly characterized in that an expansion / contraction device 29 that expands / contracts the expansion / contraction tube 12 also serves as the pressing means 17 for stopping water.

  The water stop device 1 of the present embodiment is “(1) between the inner surface of the housing water channel 5 and the outer surface of the inner tube 14”, “(2) between the inner surface of the outer tube 13 and the outer surface of the inner tube 14”, Water is stopped at three locations “between (3) the inner surface of the enclosure water channel 6 and the outer surface of the outer tube 13”.

“(1) Water stop structure between the inner surface of the enclosure water channel 5 and the outer surface of the inner pipe 14”
The water stop device 1 includes a flange 15 formed at an end of the inner pipe 14, a water stop member 16 formed of an annular elastic body provided between the inner surface of the housing water channel 5 and the outer surface of the inner pipe 14, Pressing means 17 for pressing the water member 16 against the flange 15. The pressing means 17 includes a pressing rod 18 disposed along the axial direction of the inner tube 14 outside the inner tube 14, an annular pressing tip member 19 provided at one end of the pressing rod 18 and in contact with the water stop member 16. And a rod driving unit 51 for moving the pressing rod 18 back and forth. An engagement piece 56 that engages with a stopper 57 attached to the outer surface of the inner tube 14 when the telescopic tube 12 is contracted is attached to the pressing rod 18. The stopper 57 is provided, for example, locally or annularly on the outer surface of the inner tube 14. The engaging piece 56 is also provided on the pressing rod 18 in an annular shape, for example, locally or along the circumference of the inner tube 14. The rod drive unit 51 is composed of a cylinder that expands and contracts, and may be composed of a hydraulic cylinder, an air cylinder, an electric cylinder, or the like. Further, as shown in FIG. 6, the motor 52 may include a pinion gear 53. In this case, a gear is formed on the other end side of the pressing rod 18, and the gear meshes with the pinion gear 53. ing.

“(2) Water stop structure between the inner surface of the outer tube 13 and the outer surface of the inner tube 14”
The expansion / contraction portion water stop mechanism 10 includes an expansion / contraction portion flange 22 formed at the end of the inner tube 14, and an expansion / contraction portion stop formed of an annular elastic body provided between the inner surface of the outer tube 13 and the outer surface of the inner tube 14. The water member 55 and the expansion / contraction part pressing means 21 for pressing the expansion / contraction part water stop member 55 against the expansion / contraction part flange 22 are provided. The expansion / contraction portion pressing means 21 includes an annular stopper piece 54 that protrudes from the inner surface of the outer tube 13 and contacts the expansion / contraction portion water stop member 55 and the rod driving portion 51.

“(3) Water stop structure between the inner surface of the enclosure water channel 6 and the outer surface of the outer pipe 13”
The water stop device 1 includes a flange 30 formed at an end of the outer pipe 13, a water stop member 34 formed of an annular elastic body provided between the inner surface of the housing water channel 6 and the outer surface of the outer pipe 13, Pressing means 17 that presses the water member 34 against the flange 30. The pressing means 17 includes a pressing rod 36 disposed along the axial direction of the outer tube 13 outside the outer tube 13, an annular pressing tip member 37 provided at one end of the pressing rod 36, and in contact with the water stop member 34. And a rod driving part 51 for moving the pressing rod 36 back and forth.

"Action"
As shown in FIG. 7A, the telescopic tube 12 in a state in which the pressing rods 18 and 36 are both retracted and contracted is carried into the gate chamber G using a crane or the like. Next, as shown in FIG. 7B, when the rod driving unit 51 is driven to advance the pressing rods 18 and 36, the pressing rod 18 pushes the flange 15 through the pressing tip member 19 and the water stop member 16. The pressing rod 36 pushes the flange 30 through the pressing tip member 37 and the water stop member 34, so that the telescopic tube 12 is extended, the inner tube 14 is inserted into the housing water channel 5, and the outer tube 13 is connected to the housing water channel. 6 is inserted. The expansion and contraction flange 22 of the inner tube 14 is restricted by the stopper piece 54 with the expansion and contraction water-stopping member 55 interposed therebetween, and thus the expansion limit of the expansion and contraction tube 12 is reached.

  When the push rods 18 and 36 are further advanced by a certain amount by driving the rod driving portion 51 from the time when the expansion tube 12 reaches the extension limit, the pressing tip member 19 flanges the water stop member 16 on the pressure rod 18 side. Press to 15 The water-stop member 16 is pressed against the outer surface of the inner tube 14 by being elastically deformed toward the inner side of the inner tube 14, that is, the outer surface of the inner tube 14 in response to the pressing reaction force from the flange 15. By being elastically deformed toward the inner surface of the water channel 5, it is pressed against the inner surface of the housing water channel 5. Thereby, the space between the inner surface of the enclosure water channel 5 and the outer surface of the inner pipe 14 is stopped.

  Similarly, on the pressing rod 36 side, the pressing tip member 37 presses the water stop member 34 against the flange 30. The water stop member 34 receives the pressing reaction force from the flange 30 and is elastically deformed toward the annular inner side, that is, the outer surface of the outer tube 13, thereby being pressed against the outer surface of the outer tube 13, and the annular outer side, that is, the casing. By being elastically deformed toward the inner surface of the water channel 6, it is pressed against the inner surface of the housing water channel 6. Thereby, the space between the inner surface of the enclosure water channel 6 and the outer surface of the outer tube 13 is stopped.

  Further, when the push rods 18 and 36 further move forward from the time when the expansion tube 12 reaches the expansion limit, the expansion / contraction portion water stop member 55 is also elastically deformed by receiving the pressing reaction force from the expansion / contraction portion flange 22. As a result, water is stopped between the inner surface of the outer tube 13 and the outer surface of the inner tube 14.

  When the telescopic pipe 12 is removed from the housing water channels 5 and 6 after the predetermined operation is completed, the rod driving portion 51 is driven in the reverse direction to retract the pressing rods 18 and 36, thereby elastically deforming the water stop members 16 and 34. Then, the engaging piece 56 attached to the pressing rod 18 pushes the stopper 57, whereby the inner tube 14 is inserted into the outer tube 13 and the telescopic tube 12 is contracted. Thereby, the expansion-contraction tube 12 can be removed from the housing water channels 5 and 6.

  According to the water stop device 1 of the present embodiment, the expansion / contraction device 29 that expands / contracts the expansion / contraction tube 12 also serves as the water stop pressing means 17. Become.

  The preferred embodiments of the present invention have been described above, but the present invention is not limited to those described in the drawings, and various design changes can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Water stop device 2 Housing 3, 4 Side wall 5, 6 Housing water channel 7 Gate 10 Telescopic part water stop mechanism 12 Telescopic tube 13 Outer tube 14 Inner tube 15 Flange 16 Water stop member 17 Press means 18 Press rod 19 Press tip member 20 Rod Drive unit 29 Telescopic device G Gate chamber

Claims (4)

A water stop device for stopping water between an inner surface of a housing water channel perforated in a side wall of a gate chamber and an outer surface of an end of an expansion tube inserted into the housing water channel from the gate chamber,
A flange formed at an end of the telescopic tube;
A water stop member comprising an annular elastic body provided between the inner surface of the enclosure water channel and the outer surface of the telescopic tube;
Pressing means for pressing the water stop member against the flange;
With
The water stop of the expansion tube is characterized in that the water stop member is elastically deformed in response to the pressing reaction force from the flange, thereby stopping water between the inner surface of the enclosure water channel and the outer surface of the expansion tube. apparatus. The expansion / contraction portion of the expansion / contraction tube has a double tube structure, and includes an expansion / contraction portion water stop mechanism for stopping water between the inner surface of the outer tube of the expansion / contraction portion and the outer surface of the inner tube,
The expansion / contraction part water stop mechanism
A telescopic flange formed at the end of the inner tube;
An expansion / contraction water stop member made of an annular elastic body provided between the inner surface of the outer tube and the outer surface of the inner tube;
Expansion / contraction part pressing means for pressing the expansion / contraction part water stop member against the expansion / contraction part flange;
Configured with
The stretchable portion water-stopping member is elastically deformed in response to a pressing reaction force from the stretchable portion flange, whereby water is stopped between the inner surface of the outer tube and the outer surface of the inner tube in the stretchable portion. The water stop device for the expansion tube according to claim 1. The pressing means is
A pressing rod disposed along the axial direction of the telescopic tube outside the telescopic tube;
An annular pressing tip member provided at one end of the pressing rod and in contact with the water stop member;
A rod driving unit for moving the pressing rod back and forth;
The water stop device for an expansion / contraction tube according to claim 1, wherein the water stop device is provided.   The water stop device for an expansion / contraction tube according to any one of claims 1 to 3, further comprising an expansion / contraction device that expands / contracts the expansion / contraction tube, and the expansion / contraction device also serves as the pressing unit.

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