JP4979624B2 - Vertical pipe floating prevention device and drainage structure provided in vertical pipe floating prevention device - Google Patents

Description

  The present invention relates to a vertical pipe levitation prevention device that prevents the vertical pipe from rising due to liquefaction of the ground, and a drainage structure provided in the vertical pipe levitation prevention device.

  In recent years, with the occurrence of earthquakes, the phenomenon of floating vertical pipes (for example, manholes) embedded in the ground caused by liquefaction of the ground has become a problem.

  Therefore, conventionally, as a means for preventing the manhole floating phenomenon, for example, a vertical pipe floating prevention device (hereinafter, a conventional example) disclosed in Japanese Patent Application Laid-Open No. 2007-63977 has been proposed.

  In this conventional example, an inflow hole for muddy water accompanying liquefaction is provided in the middle of the side wall of the manhole, and a riser pipe having an inflow hole at the lower end and an upper end at the groundwater level along the inner wall surface of the manhole is provided. When groundwater accompanying liquefaction is concentrated on the surrounding ground directly under the manhole due to an earthquake, etc., the groundwater is raised by the riser and diffused into the manhole from the upper end. The structure is adapted to changes in water level (normal and emergency).

  In other words, it is necessary to eliminate the water that fills the lower side of the manhole that causes the manhole to rise, so that the inflow hole is naturally below the manhole. However, in this case, it is usually necessary to maintain the minimum groundwater level required for the ground, as well as excessive groundwater inflow to the mains. As a result, the inflow hole cannot be provided on the lower side of the manhole, and therefore the groundwater level changes only when the inflow hole is provided (normal and emergency). It is because it cannot respond to.

  In this respect, the conventional example can cope with the above-described change in the groundwater level (normal time and emergency time) by providing a rising pipe that raises the groundwater flowing from the inflow hole provided below the manhole.

JP 2007-63977 A

  However, since the conventional example has a riser pipe, it is installed in a wide range in the vertical direction in the manhole, and the devices existing in the wide range may obstruct people in and out of the manhole.

  Although this point can be made difficult to get in the way by making the diameter of the riser pipe small, it can not be easily done because the drainage capacity of the core will decrease by making the small diameter pipe Currently.

  As a result of repeatedly conducting various experiments and researches in view of the current situation of such conventional vertical pipe levitation prevention devices, the present inventor can maintain the normal groundwater level as in the conventional example, and the liquid of the ground due to the earthquake. Drainage provided in epoch-making vertical tube levitation preventive devices and vertical tube levitation preventive devices that can exhibit high drainage capacity in addition to being able to be miniaturized and are not obstructive in vertical tubes such as manholes Succeeded in developing the structure.

  The gist of the present invention will be described with reference to the accompanying drawings.

  A groundwater inflow hole 3 is provided in a vertical pipe 2 embedded in the ground 1, and a groundwater introduction portion 4 for introducing groundwater from the groundwater inflow hole 3 is provided in the vertical pipe 2. When groundwater rises, groundwater is introduced from the groundwater inlet 3 to the groundwater inlet 4, and a lower drainage port 6 is provided at a position below the groundwater inlet 3 of the groundwater inlet 4. An opening / closing part 5 is provided to close the mouth 6 so that the water can be opened and closed, and the groundwater introduction amount to the groundwater introduction part 4 reaches a predetermined amount or the water pressure of the groundwater introduced to the groundwater introduction part 4 is a predetermined pressure. An opening / closing mechanism 7 that opens the opening / closing part 5 when it is detected that the drainage from the lower drainage port 6 opened by the opening / closing action mechanism 7 is detected. Open action Those of the vertical tube floating preventing apparatus characterized by comprising an open operating holding mechanism 8 allowed to hold.

  The opening / closing part 5 is provided below the lower drainage port 6 and is provided so as to be movable up and down with respect to the lower drainage port 6, and the lower drainage port 6 is closed by the upward movement of the opening / closing part 5. Then, the lower drainage port 6 is opened by moving downward, and the opening / closing operation mechanism 7 receives the water pressure of the groundwater introduced into the groundwater introduction part 4 so that the opening / closing part 5 moves downward and moves downward. 2. The vertical pipe levitation preventing device according to claim 1, wherein the drain port is opened.

  Further, the opening / closing operation mechanism 7 includes urging means 9 that urges the opening / closing part 5 upward to close the lower drainage port 6, and the water pressure of groundwater larger than the urging force of the urging means 9 is open / closed. 3. The opening and closing part 5 moves downward when acting on 5 and the lower drainage port 6 is opened, and the biasing means 9 is configured to be able to adjust the biasing force. This relates to a vertical tube levitation prevention device.

  Further, the opening operation holding mechanism 8 is configured to receive the weight of groundwater drained from the lower drainage port 6 and hold the opening operation state of the opening / closing part 5. The present invention relates to the vertical tube levitation preventing device described in any one of the items.

  The open operation holding mechanism 8 includes a water receiver 10 disposed below the lower drainage port 6 for receiving groundwater drained from the lower drainage port 6, and a drainage portion provided in the water receiver 10. 11. An operation body 12 that receives groundwater exceeding a drainage amount from 11 and operates when the water receiving body 10 becomes heavier than a predetermined weight, and opens and closes the opening / closing section 5. It concerns on the vertical pipe rising prevention apparatus of any one of 1-4.

  Further, the opening / closing part 5 and the opening / closing operation mechanism 7 are provided below the lower drainage port 6, and the opening operation holding mechanism 8 is provided below the opening / closing part 5. The present invention relates to the vertical tube levitation preventing device described in any one of the items.

  Further, in a pipe P connected to the groundwater inflow hole 3 and suspended in the vertical pipe 2, the groundwater introduction part 4 having the lower drainage port 6, the opening / closing part 5, and the opening / closing The operation mechanism 7 and the opening operation holding mechanism 8 are provided, and the vertical tube levitation preventing apparatus according to any one of claims 1 to 6 is provided.

  The vertical tube floating prevention device according to claim 7, wherein the tubular body P is configured to be detachably separated into a plurality of bodies.

  Further, a groundwater inflow hole 3 is provided in the vertical pipe 2 embedded in the ground 1, and a groundwater introduction part 4 for introducing groundwater from the groundwater inflow hole 3 is provided in the vertical pipe 2, and the ground 1 is liquefied. When the groundwater level rises, groundwater is introduced from the groundwater inlet 3 to the groundwater inlet 4, and a lower drainage port 6 is provided below the groundwater inlet 3 of the groundwater inlet 4. An opening / closing part 5 is provided to close the lower drainage port 6 so that the water can be opened and closed, and the amount of groundwater flowing into the groundwater introduction part 4 reaches a predetermined amount or the water pressure of the groundwater introduced into the groundwater introduction part 4 is predetermined. An open / close operation mechanism 7 that opens the open / close unit 5 when it is detected that the pressure has reached the pressure is provided so that the amount of groundwater introduced into the groundwater introduction unit 4 reaches a predetermined amount or the groundwater pressure of the groundwater introduction unit 4 is predetermined. Reach pressure A structure in which groundwater is drained from the lower drainage port 6 opened by the opening / closing operation mechanism 7 and when the drainage from the lower drainage port 6 is detected, the opening operation state of the opening / closing unit 5 is maintained. While the open operation holding mechanism 8 is provided, and the drainage of groundwater from the lower drainage port 6 continues, the open / close operation holding mechanism 8 keeps the open / closed portion 5 open, and the groundwater is discharged from the lower drainage port 6. The present invention relates to a drainage structure provided in a vertical pipe levitation prevention device, characterized in that the structure continues to be drained.

  Since the present invention is configured as described above, sufficient drainage is performed when the ground liquefies while maintaining the necessary groundwater level, and the vertical pipe can be prevented from rising as much as possible. Since the riser tube as in the conventional example is not required, the device can be miniaturized, and it can be installed in a vertical space such as a manhole in a space-saving manner that does not interfere with people entering or leaving. The epoch-making vertical pipe floating prevention device and the vertical pipe floating prevention device are provided with a drainage structure.

  Further, in the invention of claim 2, it is possible to easily design and implement an opening / closing operation mechanism that reliably exhibits the above-mentioned functions and effects, and the opening / closing part simply receives the amount of groundwater or groundwater pressure and opens the lower drainage port. Therefore, the vertical tube levitation preventing device has a configuration that is more practical, such that it does not require any extra large power and can be realized at a low cost.

  Further, in the invention according to claim 3, in a situation where the groundwater introduced into the groundwater introduction part is less than a predetermined amount or a predetermined pressure, the lower drainage port can be kept closed and the groundwater pressure can be reliably maintained, In addition, since it is possible to adjust and set the water pressure when the opening and closing part is opened, it is possible to adjust the timing of groundwater drainage and the groundwater level, etc. It becomes.

  Further, in the invention according to claim 4, the drainage function can be continued by receiving the drainage from the lower drainage port and surely maintaining the lower drainage port in an open state, and the opening / closing operation of the opening / closing part is maintained. However, because it is constructed using the weight of groundwater drained from the lower drainage port, no special power is required, and this open operation holding mechanism can be realized at low cost, making it more practical. It becomes a vertical tube floating prevention device with an excellent configuration.

  In addition, in the invention according to claim 5, in addition to a very efficient structure using the force of groundwater falling, a structure that can reliably move the opening and closing portion open and movable using the weight of the groundwater is obtained, Moreover, by appropriately setting the amount of water that flows out from the drainage section, even if the amount of groundwater introduced into the groundwater introduction section does not reach a predetermined amount or the water pressure of the groundwater does not reach a predetermined pressure, Since drainage can be performed continuously, it is an epoch-making vertical pipe anti-floating device that exhibits unprecedented effects such as high drainage capability.

  Moreover, in invention of Claim 6, by having arrange | positioned the underground water introduction part provided with the lower drain outlet, the opening-and-closing part, the opening-and-closing operation mechanism, and the opening operation holding mechanism to the vertical direction, it is the apparatus structure which is not bulky in a horizontal direction. Therefore, the vertical tube levitation preventing device can be easily reduced in size and has a more practical configuration.

  In addition, in the invention according to claim 7, it is possible to realize a compact apparatus having a tube size as a whole, and when the level of sewage or the like rises in the vertical pipe, the sewage or the like enters the pipe. Since it is prevented as much as possible, it becomes a vertical tube levitation preventing device having a configuration more excellent in practicality, such as being less likely to cause malfunction due to dust and the like being clogged in the device.

  Further, in the invention described in claim 8, it is possible to easily perform repairs and inspections, and to provide a vertical tube levitation preventing device having a more practical configuration that exhibits excellent maintainability. .

  Embodiments of the present invention that are considered suitable (how to carry out the invention) will be briefly described with reference to the drawings, illustrating the operation of the present invention.

  When the groundwater level in the ground 1 rises and reaches the groundwater introduction hole 3 provided in the vertical pipe 2 such as a manhole, the groundwater level flows into the groundwater introduction hole 3 and flows into the groundwater introduction part 4 in the vertical pipe 2. However, as long as the amount of groundwater introduced into the groundwater introduction part 4 reaches a predetermined amount or the water pressure of the groundwater introduced into the groundwater introduction part 4 does not reach a predetermined pressure, the groundwater in the groundwater introduction part 4 remains as it is. Will be stored.

  That is, since the groundwater is not drained by a slight rise in the groundwater level during normal times, the minimum groundwater level in the ground 1 is maintained, and there is no excessive inflow of groundwater into the sewer pipe.

  On the other hand, when the ground 1 is liquefied by the earthquake, the groundwater level in the ground 1 is remarkably increased, and a large amount of groundwater is introduced from the groundwater introduction hole 3 to the groundwater introduction part 4.

  When the amount of groundwater introduced into the groundwater introduction unit 4 reaches a predetermined amount or the water pressure of the groundwater introduced into the groundwater introduction unit 4 reaches a predetermined pressure, the opening / closing operation mechanism 7 detects this and opens the opening / closing unit 5. In operation, the lower drainage port 6 of the groundwater introduction unit 4 is opened, and the groundwater introduced into the groundwater introduction unit 4 from the lower drainage port 6 is drained.

  At this time, since the lower drainage port 6 is located below the groundwater inlet 3, the groundwater introduced from the groundwater inlet 3 to the groundwater introduction part 4 naturally flows to the lower drainage 6 below. The drainage from the lower drainage port 6 is very good.

  At this time, since the open operation holding mechanism 8 detects the drainage from the lower drainage port 6 and holds the opening / closing part 5 in the open operation state, as long as drainage from the lower drainage port 6 continues (to the groundwater introduction unit 4) As long as groundwater continues to be introduced), even if the amount of groundwater introduced into the groundwater introduction section 4 does not reach a predetermined amount or the water pressure of the groundwater introduced into the groundwater introduction section 4 does not reach a predetermined pressure, the drainage of groundwater Is done continuously.

  Accordingly, when the groundwater level rises due to liquefaction of the ground 1 (emergency), drainage is performed extremely effectively, and the vertical phenomenon of the vertical pipe 2 is effectively prevented.

  Further, unlike the conventional example (Patent Document 1), since the riser pipe is unnecessary, the apparatus can be miniaturized and does not interfere with the entrance and exit of a person in the vertical pipe 2 such as a manhole. Space-saving installation is possible.

  Further, for example, the opening / closing part 5 is provided below the lower drainage port 6 and is provided so as to be movable up and down with respect to the lower drainage port 6. And the lower opening 6 is opened by moving downward, and the opening / closing operation mechanism 7 receives the water pressure of the groundwater introduced into the groundwater introduction part 4 so that the opening / closing part 5 moves downward. If the lower drainage port 6 is configured to be opened, it is possible to easily design and implement the opening / closing operation mechanism 7 that detects the amount of groundwater introduced into the groundwater introduction section 4 or the groundwater pressure and reliably opens and closes the opening / closing section 5. Moreover, since the opening / closing part 5 simply moves downward (opens the lower drainage port 6) in response to the amount of groundwater or groundwater pressure, no extra power is required and the design can be realized at low cost. To become .

  In addition, for example, the opening / closing operation mechanism 7 includes urging means 9 that urges the opening / closing part 5 upward to close the lower drainage port 6, and the groundwater pressure is larger than the urging force of the urging means 9. When the opening / closing part 5 moves downward to act on the opening / closing part 5 and the lower drainage port 6 is opened, the urging means 9 can be introduced into the groundwater introduction part if the urging force can be adjusted. In a situation where the amount of groundwater is less than a predetermined amount or a predetermined pressure, the lower drainage port 6 can be kept closed by the biasing means 9 and the groundwater pressure can be reliably maintained. Since it is possible to adjust and set the water pressure during the opening operation, it becomes more practical, such as the adjustment of drainage timing and groundwater level of groundwater.

  For example, if the open operation holding mechanism 8 receives the weight of groundwater drained from the lower drainage port 6 and holds the open operation state of the opening / closing part 5, the drainage from the lower drainage port 6. The lower drainage port 6 can be reliably maintained in an open state and the drainage function can be continued, and the opening / closing operation of the opening / closing part is performed using the weight of the groundwater drained from the lower drainage port. Because of this structure, no extra power is required, and the opening operation holding mechanism 8 can be designed and realized at a low cost.

  For example, if the opening / closing part 5 and the opening / closing operation mechanism 7 are provided below the lower drainage port 6 and the opening operation holding mechanism 8 is provided below the opening / closing unit 5, the lower drainage port 6 is provided. Since the groundwater introduction part 4, the opening / closing part 5, the opening / closing operation mechanism 7, and the opening operation holding mechanism 8 can be arranged in the vertical direction, the apparatus can be configured not to be bulky in the lateral direction and can be easily downsized.

  Further, for example, in a pipe P that is connected to the groundwater inflow hole 3 and is suspended in the vertical pipe 2, a groundwater introduction part 4 having the lower drainage port 6, the opening / closing part 5, If the opening / closing operation mechanism 7 and the opening operation holding mechanism 8 are provided, a compact apparatus having a large tube P can be realized, and the level of sewage or the like is increased in the vertical pipe 2. In this case, the air remaining in the tubular body P prevents the entry of sewage and the like into the tubular body P as much as possible. More practical.

  In addition, for example, if the tubular body P is configured to be detachable and separable into a plurality of bodies, the tubular body P can be easily disassembled and repaired or inspected, and excellent maintainability can be exhibited. Become.

  A first embodiment of the present invention will be described with reference to FIGS.

  In the present embodiment, a groundwater inflow hole 3 is provided in a vertical pipe 2 embedded in the ground 1, and a groundwater introduction portion 4 into which groundwater flows from the groundwater inflow hole 3 is provided in the vertical pipe 2. When the groundwater level rises due to liquefaction, groundwater is introduced from the groundwater inlet 3 to the groundwater introduction part 4, and a lower drainage port 6 is provided in the groundwater introduction part 4. The groundwater introduced into the groundwater introduction section 4 is drained into the vertical pipe 2 so as to prevent the vertical pipe 2 from floating.

  Specifically, in this embodiment, a bottomed cylindrical manhole in which a main pipe 13 (sewer pipe 13) is connected to a lower part is adopted as the vertical pipe 2 embedded in the ground 1. The vertical tube 2 is not limited to a manhole, and can be appropriately adopted as long as it has a configuration that exhibits the characteristics of this embodiment.

  In addition, as shown in FIG. 1, for example, three groundwater inflow holes 3 are installed in a horizontal state in the lower part of the vertical pipe 2 (lower part than the central part) at equal intervals in the radial direction, for example. Each of the groundwater inflow holes 3 projects substantially horizontally outward from the outer wall surface of the vertical pipe 2. In addition, the number and position of this groundwater inflow hole 3 can be changed suitably.

  The groundwater inflow hole 3 of the present embodiment is configured by adopting a cylindrical pipe component (for example, a PVC pipe), and the groundwater inflow hole 3 is inserted and disposed in a hole formed through the peripheral wall of the vertical pipe 2. It protrudes from the outer wall surface substantially horizontally outward, and is configured such that the inside of the vertical pipe 2 and the outside (the ground 1) are in communication with each other through the groundwater inflow hole 3.

  In addition, a cylindrical water inlet portion 14 that is inserted into the ground water is projected from the tip of the ground water inflow hole 3. The water inlet 14 is a part for allowing groundwater in the ground 1 around the vertical pipe 2 to flow into the groundwater introduction part 4, and a filter 15 is provided therein. In addition, it is good also as a structure which provides a through-hole in the surrounding surface of the inflow part 14, and covers this inflow part 14 with a planar filter, and the point is the function to filter the groundwater mixed with the mud which is going to flow into the underground water introduction part 4. It only has to have.

  Further, the groundwater introduction part 4 is connected to the respective base ends of the respective groundwater inflow holes 3.

  Specifically, as shown in FIGS. 1 to 3, one end of a cylindrical elbow pipe 16 (for example, a polyvinyl chloride pipe) is connected to the base end of the groundwater inflow hole 3, and the other end of the elbow pipe 16 is connected. One end of a short cylindrical relay pipe 17 (for example, a vinyl chloride pipe) is connected, this relay pipe 17 is attached to the inner wall surface of the vertical pipe 2 and is suspended downward. As a configuration including the shielding plate 18 in the middle part of the interior, the space portion in the relay pipe 17 and the space portion in the elbow pipe 16 which are above the shielding plate 18 are used as the groundwater introduction portion 4.

  Further, a lower drainage port 6 for draining groundwater introduced into the groundwater introduction part 4 from the groundwater inflow hole 3 is formed through the lower end of the groundwater introduction part 4, that is, the shielding plate 18.

  The lower drainage port 6 of the present embodiment is formed in a circular through-opening portion having a relatively large diameter, and has a ring plate-like flexibility on the entire circumference of the opening peripheral edge portion of the lower drainage port 6 (for example, rubber) 6) A close contact member 6A is provided.

  In addition, the lower drainage port 6 is provided with an openable / closable portion 5 that closes the lower drainage port 6 and stops water.

  The opening / closing part 5 of the present embodiment is provided below the lower drainage port 6 and is provided so as to be movable up and down relative to the lower drainage port 6. The lower drainage port 6 is opened by closing and moving downward.

  The opening / closing portion 5 is made of a synthetic resin having flexibility such as rubber, and is formed in a conical shape having a smaller diameter on the upper side as shown in FIGS. When the opening / closing portion 5 moves upward, the peripheral side surface portion on the upper side of the opening / closing portion 5 comes into close contact with the close contact member 6A of the lower drainage port 6 and can seal water tightly. It is configured to prevent the muddy water rising inside from flowing into the groundwater introduction part 4.

  In addition, the lifting / lowering moving structure of the opening / closing part 5 includes a rod-like actuating body 12 attached to the opening / closing part 5 so as to pass through the center of the opening / closing part 5 and project both ends above and below the opening / closing part 5. The other end (lower end) of the relay pipe 17 is connected to one end of a short cylindrical drain pipe 19 (for example, a vinyl chloride pipe), and the middle position of the drain pipe 19 is shown in FIGS. The upper and lower parts of the operating body 12 are slidably guided by the guide part 21 provided in the middle position of the relay pipe 17 so that the opening / closing part 5 can be moved up and down relative to the lower drainage port 6. The structure is as follows.

  In the present embodiment, an opening / closing operation mechanism 7 is provided that opens the opening / closing portion 5 when it is detected that the water pressure of the groundwater introduced into the groundwater introduction portion 4 has reached a predetermined pressure.

  Specifically, the opening / closing operation mechanism 7 receives the water pressure of the groundwater introduced into the groundwater introduction part 4 by the upper surface of the opening / closing part 5, so that the opening / closing part 5 naturally moves downward and the lower drainage port 6 opens. It is configured.

  In addition, an urging means 9 is provided for energizing the opening / closing part 5 to close the lower drainage port 6, and the opening / closing part 5 opens and closes when a groundwater pressure greater than the urging force of the urging means 9 acts on the opening / closing part 5. The urging means 9 is configured to be capable of adjusting the urging force while the portion 5 is moved downward to open the lower drainage port 6.

  The biasing means 9 of the present embodiment is provided with an upper spring receiver 9A at the lower end of the operating body 12, and on the other hand, a mounting member 22 is projected from the inner wall surface of the drain pipe 19 toward the center of the drain pipe 19. At the same time, the attachment member 22 is provided with a lower spring receiver 9B, the lower spring receiver 9B and the upper spring receiver 9A are provided in a vertically arranged state, and the opposed upper spring receiver 9A and lower spring receiver 9A are provided. An elastic body (coil spring) 9D having an anti-contraction elasticity is disposed between 9B and 9B, and the urging force of the elastic body 9D constantly urges the opening / closing part 5 to close the lower drainage port 6. Yes.

  The lower spring receiver 9B is screwed to the mounting member 22 so as to be capable of moving up and down, and an operation portion 9C (hexagonal head) projecting from the lower end of the lower spring receiver 9B is provided. By rotating, the lower spring receiver 9B can be adjusted up and down to adjust the urging force of the elastic body 9D. That is, the opening timing of the opening / closing part 5 is determined by the strength of the elastic body 9D, but the groundwater draining timing and the groundwater level can be adjusted by adjusting the strength of the elastic body 9D.

  The opening / closing operation mechanism 7 is not limited to this embodiment, and is configured to open the opening / closing unit 5 by detecting that the amount of groundwater introduced into the groundwater introduction unit 4 has reached a predetermined amount. May be.

  In the present embodiment, an opening operation holding mechanism 8 is provided that holds the opening operation state of the opening / closing portion 5 when the drainage from the lower drainage port 6 opened by the opening / closing operation mechanism 7 is detected.

  Specifically, the opening operation holding mechanism 8 is configured to receive the weight of the groundwater drained from the lower drain port 6 and hold the opening operation state of the opening / closing part 5.

  More specifically, the amount of water drainage from the water receiver 10 disposed below the lower drainage port 6 for receiving the groundwater drained from the lower drainage port 6 and the drainage portion 11 provided in the water receptor 10 is as follows. The water receiving body 10 is activated by receiving excess ground water and becomes heavier than a predetermined weight, so that the opening / closing portion 5 is opened.

  As shown in FIGS. 4 to 9, the water receiving body 10 is formed of an appropriate metal container of an upper opening type, and is attached to an operating body 12 penetrating through the opening / closing portion 5.

  Further, the water receiving body 10 is provided below the opening / closing part 5 at a distance from the opening / closing part 5, and is configured to move up and down together with the opening / closing part 5 via the operating body 12.

  Further, in this embodiment, when the opening / closing part 5 moves downward to open the lower drainage port 6, the groundwater flowing down along the inclined outer peripheral surface of the opening / closing part 5 is also stored in the lower water receiver 10. It is composed.

  Specifically, an annular plate-shaped running water guiding portion 20 is provided around the lower inner peripheral surface of the relay pipe 17, and once the lower drainage port 6 is opened, the outer surface is once transmitted along the inclined outer peripheral surface of the opening / closing portion 5. The groundwater guided to the inside is guided inward by the flowing water guiding portion 20 and is satisfactorily dropped and stored in the water receiver 10. In addition, the shape of the flowing water guiding portion 20 is formed into a shape that is more likely to fall into the water receiving body 10 as the drainage flow rate from the lower drainage port 6 increases, and to fall downward as it is. is doing.

  The water receiver 10 is provided so as to store a predetermined amount of water, and the energizing force is applied when a weight of a predetermined amount or more is applied to the water receiver 10 (when a predetermined amount or more of water enters). The water receiving body 10 moves downward against the return biasing force of the means 9 (elastic body 9C), and at the same time, the opening / closing part 5 also moves downward to open the lower drainage port 6.

  Further, the water receiving body 10 is provided with a draining portion 11, and water is drained from the draining portion 11 so that the water receiving body 10 becomes lighter than a predetermined weight. The receiver 10 is configured to move upward.

  The drainage portion 11 is provided in the drainage channel 11A at the bottom of the water receiving body 10, and a bolt rod 11B is screwed onto the middle portion of the drainage channel 11A so as to be able to advance and retract. The water drainage path 11A is configured to be adjustable in width by advancing and retreating, and the amount of water drainage can be adjusted by this width adjustment.

  Therefore, the adjustment of the drainage amount in the drainage part 11 makes it possible to adjust the operation timing of the open operation holding mechanism 8 easily and reliably, and even if the groundwater pressure in the groundwater introduction part 4 becomes a predetermined pressure or less. It becomes possible to keep the lower drainage port 6 open.

  Further, when the ground water received by the water receiver 10 is drained from the drain part 11 and the water receiver 10 becomes lighter than a predetermined weight, the actuating force of the biasing means 9 raises the operating body 12. The opening / closing part 5 is configured to be closed.

  That is, in this embodiment, in the pipe P composed of the elbow pipe 16, the relay pipe 17, and the drain pipe 19, the groundwater introduction section 4 provided with the lower drainage port 6, the opening / closing section 5, The opening / closing operation mechanism 7 and the opening operation holding mechanism 8 are provided to provide a compact device configuration having a large tubular body P as a whole.

  Further, in the present embodiment, the connection structure of the elbow pipe 16, the relay pipe 17, and the drain pipe 19 is a screwed structure, so that each pipe 16, 17, 19 can be easily detached and separated. In the figure, reference numeral 25 denotes a male screw portion, and 26 denotes a female screw portion. Therefore, the present apparatus is configured so that it can be easily repaired and repaired. In addition, you may comprise the pipe body P by one thing.

  The operation of the vertical tube levitation preventing apparatus according to this embodiment having the above-described configuration will be described.

  When the groundwater level in the ground 1 rises and reaches the groundwater introduction hole 3 provided in the manhole 2, the groundwater level flows into the groundwater introduction hole 3 and is introduced into the groundwater introduction part 4 in the manhole 2.

  However, as long as the water pressure of the groundwater introduced into the groundwater introduction part 4 does not reach a predetermined pressure, the opening / closing part 5 keeps the lower drainage port 6 closed by the urging force of the urging means 9. The groundwater inside will be stored as it is.

  That is, to the extent that the groundwater level in the normal state has risen, the state of FIG. 5 is maintained and drainage into the sewer pipe of groundwater is not performed.

  When a large amount of groundwater is introduced into the groundwater introduction part 4 from the groundwater introduction hole 3 (in an emergency), that is, when the ground 1 is liquefied due to an earthquake, the amount of groundwater in the groundwater introduction part 4 suddenly increases. Since it increases, the water pressure in the groundwater introduction part 4 also increases. When this water pressure exceeds a predetermined pressure, the opening / closing part 5 is pushed down against the urging force of the urging means 9 and the water stop state of the lower drainage port 6 is released. The groundwater in the groundwater introduction part 4 is drained from the lower drainage port 6 (see FIG. 6).

  At this time, the water receiver 10 also moves downward together with the opening / closing part 5. However, the drainage from the lower drainage port 6 is accommodated in the water receptor 10 by the flowing water guiding part 20, and groundwater enters the water receptor 10. Becomes heavier than a predetermined weight, that is, when the weight exceeds the urging force of the urging means 9 (elastic body 9D), the water receiving body 10 is held in the lowered state, and the opening operation state of the opening portion 5 is held. (See FIG. 7). Then, as long as the drainage from the lower drainage port 6 continues and the weight of the water receiver 10 becomes a predetermined weight or more (as long as groundwater continues to be introduced into the groundwater introduction part 4), the groundwater introduced into the groundwater introduction part 4 Even if the water pressure of the water does not reach the predetermined pressure, the groundwater is continuously drained.

  When the amount of groundwater in the groundwater introduction part 4 decreases and the amount discharged from the lower outlet 6 decreases, groundwater is gradually not guided from the flowing water guiding part 20 and the amount of groundwater stored in the water receiver 10 also decreases. (See FIG. 8). Then, when a predetermined amount of water has escaped from the drainage part 11 and the weight of the water receiver 10 becomes lighter than a predetermined weight, and the water pressure of the groundwater introduced into the groundwater introduction part 4 becomes equal to or lower than the predetermined pressure, Due to the return bias of the elastic body 9D of the biasing means 9, the water receiving body 10 moves upward, and the opening / closing part 5 also moves upward to close the lower drainage port 6 and enter a water stop state (see FIG. 9).

  In the present embodiment configured as described above, the opening / closing operation mechanism 7 is configured such that the opening / closing part 5 is opened by receiving the water pressure directly from the groundwater, so that the opening / closing part 5 is opened instantly and reliably. .

  Moreover, since the lower drainage port 6 has a large diameter, the drainage capacity is high, and mud and sand accumulated in the groundwater introduction part 4 can be discharged at once, so that it is not necessary to perform frequent cleaning or the like.

  In addition, since the groundwater introduction part 4 (lower drainage port 6), the opening / closing part 5, the opening / closing operation mechanism 7 and the opening operation holding mechanism 8 are provided on the same vertical line, the apparatus is not bulky in the lateral direction and has a compact structure. It is possible to Further, in the present embodiment, since the device structure is entirely constituted by a pipeline (pipe body P), the screw attachment / detachment structure can be easily designed and realized, and maintenance work can be easily performed. Further, when the level of sewage or the like rises in the vertical pipe 2, the air remaining in the pipe P prevents the entry of sewage or the like into the pipe P as much as possible. Is difficult to cause malfunction due to clogging in the apparatus (see FIG. 10).

  Further, in the present embodiment, since the opening operation holding mechanism 8 that holds the opening operation of the opening / closing portion 5 is performed using the weight of the groundwater drained from the lower drainage port 6, any special large power (for example, The power of the motor, engine, etc. is not necessary, and the cost can be reduced (manufacturing cost and running cost can be reduced), and the structure can be made compact.

  Further, the opening operation holding mechanism 8 according to the present embodiment is configured to operate by receiving the weight of the groundwater that has been drained and dropped from the lower drainage port 6 at the lower end of the groundwater introduction section 4 so that the opening / closing section 5 can be opened and moved. Since there is a very efficient structure using the groundwater falling force, the cost is further reduced.

  Further, the biasing means 9 of the present embodiment includes a biasing means for the opening / closing portion 5 to keep the lower drainage port 6 closed, and a biasing force for returning the lightened water receiver 10 to its original position. Since the configuration also serves as the means, the configuration can be simplified, cost-effective and space-saving compared to a configuration in which separate urging means are provided.

  Further, in this embodiment, since the lower drainage port 6 is provided at a lower position than the groundwater inflow hole 3 at the lower end of the groundwater introduction part 4, the groundwater introduced into the groundwater introduction part 4 can be drained well. .

  A second embodiment of the present invention will be described with reference to FIG.

  The present embodiment shows a case where a plurality of groundwater inflow holes 3 are connected to one groundwater introduction part 4 in the first embodiment.

  Further, in this embodiment, a case is shown in which the tube A is configured by adopting a straight tube 16A instead of the elbow tube 16.

  Other configurations are the same as those of the first embodiment.

  A specific third embodiment of the present invention will be described with reference to FIG.

  The present embodiment shows a case where, in the first embodiment, the three groundwater introduction portions 4 are connected to each other by the connecting pipe 24.

  This embodiment also shows a case where the straight tube 16A is used instead of the elbow tube 16 to configure the tube body A.

  Other configurations are the same as those of the first embodiment.

  A fourth embodiment of the present invention will be described with reference to FIG.

  The present embodiment shows a case in which the water intake section 14 of the groundwater introduction section 4 is extended to collect more water around the vertical pipe 2 in the first embodiment.

  Other configurations are the same as those of the first embodiment.

  A specific embodiment 5 of the present invention will be described with reference to FIG.

  The present embodiment shows a case where the water inlet 14 is arranged below the foundation of the building 23 so as to prevent the building 23 from rising as well as the vertical pipe 2.

  Other configurations are the same as those of the first embodiment.

  In addition, this invention is not restricted to Examples 1-5, The concrete structure of each component can be designed suitably.

FIG. 3 is an explanatory front sectional view showing a usage state of the first embodiment. FIG. 3 is an explanatory perspective view illustrating a usage state of the first embodiment. 1 is an exploded perspective view showing Example 1. FIG. FIG. 3 is a schematic operation explanatory diagram in the usage state of the first embodiment. FIG. 3 is a partially enlarged front sectional view showing a normal time in a use state of Example 1. It is operation | movement explanatory drawing which showed a mode that the groundwater pressure in a groundwater introduction part became more than predetermined pressure by the liquefaction of the ground in the use condition of Example 1, and an opening-and-closing part opened and the groundwater was drained from a lower drainage port. . FIG. 7 is an operation explanatory diagram showing a state in which drainage from the lower drainage is stored in the water receiving body following the state of FIG. 6. Following the state of FIG. 7, even when the groundwater pressure in the groundwater introduction part becomes equal to or lower than the predetermined pressure, the state that the opening / closing part is kept open by the weight of the water receptor and the drainage from the lower drainage port continues. It is operation | movement explanatory drawing shown. FIG. 9 is an operation explanatory view showing a state in which the drainage from the lower drainage port is stopped following the state of FIG. 8, the water in the water receiving body is also drained, and the opening / closing part is automatically closed to enter a water-stopped state. FIG. 3 is a partially enlarged explanatory view showing a state in which infiltration of sewage or the like into the pipe is prevented by air remaining in the pipe when the water level of the sewage rises in the vertical pipe in the usage state of the first embodiment. . FIG. 6 is an explanatory perspective view showing Example 2. FIG. 6 is an explanatory plan sectional view in a use state of Example 3. FIG. 6 is an explanatory front sectional view in a use state of Example 4. FIG. 6 is an explanatory front sectional view in a use state of Example 5.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ground 2 Vertical pipe 3 Groundwater inflow hole 4 Groundwater introduction part 5 Opening and closing part 6 Lower drainage port 7 Opening and closing operation mechanism 8 Opening operation holding mechanism 9 Energizing means
10 Water receptor
11 Drainage section
12 Actuator P Tube

Claims (9)

  A groundwater inflow hole is provided in a vertical pipe buried in the ground, and a groundwater introduction part for introducing groundwater from the groundwater inflow hole is provided in the vertical pipe, and when the groundwater level rises due to liquefaction of the ground, An opening / closing part configured to introduce groundwater into the groundwater introduction part, and to provide a lower drainage port at a position below the groundwater inflow hole of the groundwater introduction part and to close the lower drainage port so as to be openable and closable. Opening and closing that opens and closes the opening and closing unit when detecting that the amount of groundwater introduced into the groundwater introduction unit has reached a predetermined amount or the pressure of groundwater introduced into the groundwater introduction unit has reached a predetermined pressure Provided with an open mechanism for holding the open / close state of the opening / closing part when drainage from the lower drainage port opened by the open / close operation mechanism is detected. Vertical tube floating preventing apparatus according to claim.   The opening / closing portion is provided below the lower drainage port, and is provided so as to be movable up and down relative to the lower drainage port. When the opening / closing portion moves upward, the lower drainage port is closed and moved downward. The opening and closing mechanism is configured to open the opening and closing of the opening and closing part by receiving the water pressure of the groundwater introduced into the groundwater introduction part. The vertical tube floating prevention device according to claim 1.   The opening / closing operation mechanism includes an urging means that urges the opening / closing part to close the lower drainage port, and the opening / closing part is activated when a groundwater pressure higher than the urging force of the urging means acts on the opening / closing part. The vertical pipe ascent prevention device according to claim 2, characterized in that the lower drainage port is opened by moving downward and the biasing means is configured to adjust the biasing force.   4. The structure according to claim 1, wherein the opening operation holding mechanism is configured to hold the opening operation state of the opening / closing portion in response to the weight of groundwater drained from the lower drainage port. The vertical pipe ascent prevention device as described.   The open operation holding mechanism includes a water receptor disposed below the lower drainage port and receiving groundwater drained from the lower drainage port, and groundwater exceeding a drainage amount from a drainage portion provided in the water receptor. In response, the water receiving body is activated by becoming heavier than a predetermined weight, and is configured with an operating body that opens the opening / closing portion. Vertical pipe levitation prevention device.   6. The opening / closing operation mechanism and the opening / closing operation mechanism are provided below the lower drainage port, and the opening operation holding mechanism is provided below the opening / closing portion. Vertical pipe levitation prevention device.   In a pipe body connected to the groundwater inflow hole and suspended in the vertical pipe, a groundwater introduction part having the lower drainage port, the opening / closing part, the opening / closing operation mechanism, and the opening operation holding mechanism, The vertical tube levitation preventing device according to claim 1, wherein the vertical tube levitation preventing device is provided.   The vertical tube floating prevention device according to claim 7, wherein the tube body is configured to be detachable and separable into a plurality of bodies.   A groundwater inflow hole is provided in a vertical pipe buried in the ground, and a groundwater introduction part for introducing groundwater from the groundwater inflow hole is provided in the vertical pipe, and when the groundwater level rises due to liquefaction of the ground, An opening / closing part configured to introduce groundwater into the groundwater introduction part, and to provide a lower drainage port at a position below the groundwater inflow hole of the groundwater introduction part and to close the lower drainage port so as to be openable and closable. Opening / closing operation that opens and closes the opening / closing part when it is detected that the amount of groundwater flowing into the groundwater introduction part has reached a predetermined amount or the pressure of groundwater introduced into the groundwater introduction part has reached a predetermined pressure Provided with a mechanism, and when the groundwater introduction amount to the groundwater introduction part reaches a predetermined amount or the groundwater pressure of the groundwater introduction part reaches a predetermined pressure, the lower drainage opened by the opening / closing operation mechanism And a structure for draining groundwater from the lower drainage port, and an open operation holding mechanism for holding the open operation state of the opening and closing unit when it is detected that the drainage is discharged from the lower drainage port. While drainage continues, the open / close operation holding mechanism maintains the open state of the open / close section, and the ground pipe continues to drain from the lower drainage port. Drainage structure.

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