JP4746394B2 - Valve device for preventing floating of underground objects - Google Patents

Description

  The present invention is attached to the peripheral wall of a buried object in order to prevent the buried object such as a manhole for a sewer or a common ditch from floating due to the liquefaction phenomenon of the ground at the time of an earthquake, and is always attached from the inside of the buried object to the outside of the buried object. The present invention relates to a valve device that shuts off the flow of water to the underground side and flows water from the underground side into the buried object when the soil pore water pressure on the underground side increases.

In the event of an earthquake, buried objects such as manholes may rise due to the liquefaction phenomenon of the ground, and when the manholes rise, the sewer pipes cannot be graded and the functions of the sewer pipes may be lost. As one of means for preventing a buried object such as a manhole from being lifted due to an earthquake or the like, Patent Document 1 below discloses that a water passage hole is formed in the peripheral wall of the manhole, and the water passage hole is connected to the manhole from the outside of the manhole. A technique is disclosed in which a check valve capable of passing water is provided, water in the ground around the manhole is taken into the manhole through a water hole, and the water content of the surrounding ground is lowered to prevent liquefaction.
JP-A-8-170349

  The conventional technology described above cannot be applied to existing manholes and other buried objects, and there is a possibility that earth and sand may flow into the buried objects from the outside, and there is still room for improvement in this respect. It was. Therefore, in Japanese Patent Application No. 2004-318818, a water passage hole is formed in the peripheral wall of an existing buried object such as a manhole, and water flow from the underground side outside the buried object to the buried object is allowed to the water passage hole. However, it is proposed to install a check valve that always shuts off the flow of water from the inside of the buried object to the outside of the buried object, and Japanese Patent Application No. 2005-209798 filed earlier by the present applicant includes Various structures for the check valve have been proposed, but this check valve still has room for improvement.

  The present invention opens when the soil pore water pressure on the underground side outside the buried object reaches a set pressure, and allows water contained in the underground side to flow into the buried object at once and in large quantities through the opening. An object of the present invention is to provide a valve device that can be used.

  The invention according to claim 1 is mounted so as to be extrudable in a water guide hole opened in a peripheral wall of a buried object such as a manhole or a joint groove or a cylindrical case fixed to the water guide hole. A valve device that opens the water guide hole or case when the water is pushed out of the water guide hole or case and allows the water to flow in from the water guide hole or case. A lock means for releasably fixing to the case and a lock release means for releasing the lock by the lock means when the underground water pressure outside the buried object reaches a set value are provided.

  The invention according to claim 2 is a fixture in which the locking means of the invention according to claim 1 is detachably locked to the water guide hole or the case, and the fixing release means is turned on when the water pressure reaches a set value. A pressure detection switch, and an actuator such as an electromagnet, solenoid, air cylinder, or electric motor that is excited or activated when the pressure detection switch is turned on to release the fixture from the water guide hole or case. To do.

  As a fixture used in the present invention, for example, as shown in FIG. 1, the valve device 1 protrudes and can be raised and lowered, and is engaged and disengaged in the fitting groove 4 of the water guide hole 3 formed in the peripheral wall 2 of the buried object. 2, a fixing pin 7 which is attached to the valve device 1 so as to be able to protrude and retract and is fitted and locked in the fitting groove 4 of the water guide hole 3 formed in the peripheral wall 2 of the embedded object when protruding. Can be illustrated.

  There are two types of pressure detection switches, one that can adjust the set pressure, and one that can adjust the set pressure. The pressure detection switch of the present invention may be of any type that can or cannot adjust the set pressure.

  The invention according to claim 3 outputs, when the pressure reaches a set value, instead of the pressure detection switch of the invention according to claim 2, or a pressure sensor for detecting the pressure and an output signal of the pressure sensor. Control means comprising a microcomputer for exciting an electromagnet or activating an actuator is provided.

  In each of the above inventions, a power source is required to excite an electromagnet or a solenoid or to activate an actuator. For this power source, a dry battery or a storage battery provided inside the valve device can be used, and an external power source can be used. A power source or a rectified AC current can be used. When an external power source is used, the external power source and the valve device are connected by a lead wire.

The invention according to claim 4 is characterized in that the valve device of the invention according to claims 1 to 3 has a cannonball shape with a tapered rear portion so that the valve device can be easily pushed out and removed from the cylindrical case.
The invention according to claim 5 is characterized in that the valve device of the invention according to claims 1 to 4 is connected to an embedded object by a wire or a chain.

  According to the first aspect of the present invention, when the water pressure outside the peripheral wall reaches a set value, the locking by the locking means is released, whereby the valve device is pushed out of the water guide hole or case into the peripheral wall by the water pressure, and the water guide hole or case Opens on the entire surface. Then, a large amount of water outside the peripheral wall can be discharged into the buried object without being blocked by the valve device from the opened water guide hole or case, thereby preventing the buried object from floating.

  Further, as in the inventions according to claims 2 and 3, by using the pressure detection switch and the pressure sensor, the valve device can be unfixed with high accuracy.

  With respect to the pressure detection switch that can adjust the set pressure, the operating pressure can be adjusted according to the depth of the buried object, the amount of groundwater, the strength of the ground, and the like, thereby improving the anti-floating effect. With a fixed pressure detection switch in which the set pressure cannot be adjusted, the same effect as that of the adjustment type can be obtained by selecting from several types of pressure detection switches having different operating pressures according to the conditions of the installation location.

According to the invention which concerns on Claim 4, a valve apparatus will be extruded from a water guide hole or a case, and will become easy to detach | leave.
According to the invention which concerns on Claim 5, a valve apparatus is extruded from a water conveyance hole or a case, and even if water flows in, it will not be pushed away and will be lost, but it can mount | wear with a water conveyance hole or a case, and can be reused.

Hereinafter, a valve device according to an embodiment of the present invention will be described with reference to the drawings.
A valve device 11 shown in FIG. 3 has a cylindrical main body 14 whose rear portion is tapered and closed at both ends with lids 12 and 13, and a peripheral wall 16 outside a manhole which is an embedded object through a hole 15 in the lid 13. Turns ON when the water pressure on the ground side reaches a set value, and can be moved in and out of the pressure detection switch 17 with adjustable operating pressure, the dry battery 20 used as a power source (FIG. 4), the electromagnet 18 and the main body 14. 4 includes a fixing pin 19 as a fixing tool that protrudes from the main body 14 by excitation of the electromagnet 18. The pressure detection switch 17, the dry battery 20, and the electromagnet 18 are provided in the main body 14. The electromagnet 18 is excited when the pressure detection switch 17 is turned on, and the fixing pin 19 is thereby drawn into the main body 14.

  The valve device 11 is detachably attached to a cylindrical case 21 and is connected to the case 21 and a wire 22 at an end, and the case 21 is fixed by being pushed into a water guide hole 23 formed in the peripheral wall 16 of the manhole. It can be installed in the state.

  The case 21 is also formed with a fitting hole 24 in which the above-described fixing pin 19 is releasably locked by protruding and retracting, and a fracture fitting 25 is attached to the tip. The former fitting hole 24 is shown in FIG. 5, it can be replaced with an annular groove 26 formed on the inner wall surface of the case 21 in the inner circumferential direction. The latter fracture metal fitting 25 is formed by fixing a core 25b having a cross-shaped cross section as shown in FIG. 6 and one end formed in a mountain shape to a steel pipe 25a cut obliquely. When attaching the valve device 11 to the manhole peripheral wall 16, first, a hole slightly shallower than the thickness of the manhole peripheral wall is formed in the manhole peripheral wall 16 by a core drill (not shown). Next, the lid 12 or 13 of the valve device 11 was opened, and the operating pressure of the pressure detection switch 17 was adjusted in consideration of the set depth of the valve device 11, the amount of groundwater, the strength of the ground, etc., and then the lid 12 or 13 was closed. After that, the valve device 11 is inserted into the case 21 to which the breaking metal fitting 25 is attached, and the fixing pin 19 is fitted and locked in the fitting hole 24 of the case 21 to integrally connect the valve device 11 to the case 21.

  After that, a driving device (not shown) is connected to the case 21 and the breaking metal fitting 25 is pressed into a hole formed in the manhole peripheral wall 16 to press fit, and the thin peripheral wall remaining in the hole is broken by the breaking metal fitting 25 at the tip. FIG. 3 shows a state in which the valve device 11 is mounted with the case 21 in the water guide hole 23 formed in this way.

  In the figure, 27 is an O-ring that is mounted in an annular groove 28 on the outer periphery of the main body and seals between the case 21, and 29 is a sealing material that seals between the case 21 and the water guide hole 23 of the manhole peripheral wall 16. is there.

  The valve device of the present embodiment is configured as described above, and when the water pressure outside the peripheral wall rises with the water guide hole 23 of the manhole peripheral wall 16 mounted and reaches the operating pressure of the pressure detection switch 17, the pressure detection switch 17 is The fixing pin 19 is pulled in and is removed from the fitting hole 24 of the case 21. Then, since the water pressure acts on the lid 13 of the valve device 11 through the fractured fitting 25, the valve device 11 is pushed and moved in the case 21 (FIG. 7) and is pushed out from the case 21 into the manhole (FIG. 8). At the same time, water outside the peripheral wall is discharged through the fractured fitting 25 and the opened case 21 and flows into the manhole at a stretch. The valve device 11 pushed together with water in the manhole is not lost because it is connected to the water guide hole 23 by the case 21 and the wire 22 that are fixedly attached.

  In the embodiment shown in FIG. 9, a sensor 31 for detecting the water pressure outside the manhole peripheral wall is provided instead of the pressure detection switch 17, and the pressure detected by the pressure sensor 31 by the control device 32 configured by a microcomputer becomes the set value. When it reaches, it outputs to the control circuit of the electromagnet 18 to excite the electromagnet 18.

Sectional drawing which shows the state which fixed the valve apparatus to the water conveyance hole of the embedded surrounding wall with the latching claw. Sectional drawing which shows the state which fixed the valve apparatus to the water conveyance hole of the embedded surrounding wall with the fixing pin. Sectional drawing of the valve apparatus which concerns on this invention with which the water guide hole of the embedded surrounding wall was mounted | worn. The schematic diagram which shows the cancellation | release mechanism of fixation by a fixing pin. Sectional drawing which shows another aspect of a case. The side view of a fracture metal fitting. The figure which shows the state by which the valve apparatus was pushed and moved within the case. The figure which shows the state by which the valve apparatus was extruded from the case. The block diagram which shows another releasing mechanism of fixation by a fixing pin.

Explanation of symbols

1, 11 ..Valve device 2 .. buried object 3, .. water guide hole 4 .. fitting groove 5 .. locking claw 7, 19 .. fixing pin 12, 13 .. lid 14. · Hole 16 · · Manhole peripheral wall 17 · Pressure detection switch 18 · Electromagnet 20 · Dry cell 21 · Case 22 · Wire 24 · Fitting hole 25 · Breaking metal fittings 26 and 28 · Annular groove 27 ·・ O-ring 29 ・ ・ Sealing material 31 ・ ・ Pressure sensor 32 ・ ・ Control device

Claims (5)

  Attached to a water guide hole opened in the peripheral wall of a buried object such as a manhole or a joint groove or a cylindrical case fixed to the water guide hole so that it can be pushed out. A valve device that opens the water guide hole or case when it is pushed out of the hole or case and allows water to flow in from the case, and fixes the valve device to the water guide hole or case so as to be unlocked. A valve device comprising: a lock unit; and a lock release unit that releases the lock by the lock unit when the underground water pressure outside the buried object reaches a set value.   The lock means is a fixture that is removably locked to the water guide hole or the case, and the fixation release means is energized by a pressure detection switch that is turned on when the water pressure reaches a set value, and the pressure detection switch being turned on. 2. The valve device according to claim 1, further comprising an actuator such as an electromagnet, a solenoid, an air cylinder, an electric motor, or the like that is activated to detach the fixing tool from the water guide hole or the case.   A pressure sensor that outputs when the pressure reaches a set value instead of the pressure detection switch, or a pressure sensor that detects the pressure, and a control means that excites the electromagnet by the output signal of the pressure sensor or activates the actuator. The valve device according to claim 2, wherein the valve device is provided.   The valve device according to any one of claims 1 to 3, wherein the valve device is formed in a cannonball shape having a tapered rear portion so that the valve device can be easily pushed out and removed from the cylindrical case.   The valve device according to any one of claims 1 to 4, wherein the valve device is connected to an embedded object by a wire, a chain, or the like.

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