JP2008106461A - Flush gate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a constitutionally simple flush gate which dispenses with external power such as hydraulic pressure and electric power under abnormal conditions, and which can be maintained without involving a risk. <P>SOLUTION: This flush gate is equipped with an attitude switching mechanism which releases a valve body 2 and a holding portion in such a manner as to be interlocked with a float 30 which moves upward and downward in accordance with a water level when reaching a flush performance water level, and which allows the valve body to be tilted and turned into a reversed attitude by the pushing force of the water. A base portion of the valve body 2 is journaled on right and left structures on or near the bottom of a water channel, so that the valve body 2 can freely swing between the raised water-sealing attitude of closing the water channel and the reversed attitude of opening the water channel. The holding portion holds the valve body 2 in the raised water-sealing attitude against the pushing force of the water until the upstream-side water level of the water channel rises up to the flush performance water level. The flush gate is also equipped with an auxiliary mechanism 70 which increases the force of releasing the holding portion by the float 30, when the water level rises. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a flush gate that periodically flushes rivers, sewage pipes, irrigation canals, and the like.

  Conventionally, it is installed in rivers, sewage pipes, irrigation canals, etc., without using a hoisting device that requires power such as hydraulic equipment or electric equipment, so that the valve body in the standing water stop posture can be autonomously overturned. There has been proposed a flush gate that performs flushing and automatically returns the valve body to a standing water posture after washing.

  For example, in Patent Document 1, the base is pivotally supported by left and right structures at or near the bottom of the water channel, and can swing between a standing water stopping posture that closes the water channel and a falling posture that opens the water channel. And a holding portion that holds the valve body in a standing water posture against the pressure of water until the upstream water level of the water channel rises to the flush execution water level when the flush execution water level is reached. A flush gate that is released in conjunction with a float that moves up and down according to the water level, and has a posture switching mechanism that allows the valve body to tilt to a fall posture due to the pressing force of the water, and periodically flushes waterways and the like Has been proposed.

Further, in Patent Document 2, when dust or the like is bitten during the closing operation, or when dust or the like accumulates on the lower side of the door body during the opening operation, it is possible to remotely operate the gate and eliminate the obstacle. For the purpose of providing floating gates with emergency operation devices, floating undulations are installed in the cross section of the locks on the river bank, and are automatically opened and closed due to fluctuations in the river water level. In a floating gate facility for preventing backflow of river water consisting of a door body, the working chamber provided on the side of the waterway is differentially coupled with a pin provided at the tip of a torque arm attached to the drive shaft for rotating the door body and an arc-shaped hole. A floating gate with an emergency operating device has been proposed in which an operating arm and a hydraulic cylinder for driving the operating arm are installed.
JP 2005-105641 A JP 2000-27165 A

  The conventional flush gate described above is for washing solid foreign matters such as earth and sand accumulated in the water channel to the downstream side by the water flow that flows out from the upstream side when the valve body falls, but there are various types that float on the water at the time of washing. As a result of the extraneous solid foreign matter adhering to the valve body and the gate part, the foreign body is clogged and locked in the holding part that holds the valve body that has returned to the standing water stop posture, and the upstream water level rises and float buoyancy increases. There is a problem that even if it acts on the holding part, there is a possibility that the release of the holding part may be hindered.

  In addition, if the valve body and the left or right structure are clogged with foreign matter, there is a problem that even if the holding portion is released due to the buoyancy of the float, the posture cannot be changed over.

  In such a case, if the worker performs maintenance work close to the flash gate, there is a risk of getting caught in the sudden water flow that occurs when the valve body falls over. Further improvement has been desired in order to switch the valve body to the falling posture.

  However, as described in Patent Document 2, when an emergency operation device using a hydraulic cylinder is provided, there is a problem in that external power is required and the structure of the flash gate is complicated and the cost is increased. there were.

  In view of the above-described problems, an object of the present invention is to provide a flash gate that does not require external power such as hydraulic pressure or electric power in an abnormal state and can be maintained without risk with a simple configuration.

  In order to achieve the above-described object, the first characteristic configuration of the flash gate according to the present invention is that the base is formed in the left and right structures at or near the bottom of the water channel as described in claim 1 of the claims. A valve body that is pivotally supported and can swing between a standing water stopping posture that closes the water channel and a falling posture that opens the water channel, and a water pusher until the water level on the upstream side of the water channel rises to the flush execution water level. The holding portion that holds the valve body in a standing water stop posture against pressure is released in conjunction with a float that moves up and down according to the water level when the flush execution water level is reached, The flash gate is provided with a posture switching mechanism that allows the valve body to tilt to the falling posture, and includes an auxiliary mechanism that raises the releasing force of the holding portion by the float when the water level rises.

  According to the above-described configuration, for example, even when the holding portion is locked due to clogging of foreign matter and the valve body is maintained in the standing water stopping posture even when the flush execution water level is reached, the releasing force of the holding portion by the float is reduced. By increasing by the auxiliary mechanism, the holding portion in the locked state can be forcibly released, and the valve body can be tilted by the upstream water pressure.

  In the second feature configuration, as described in claim 2, in addition to the first feature configuration described above, the auxiliary mechanism is attached at one end to the float side and biases the float in a floating direction. It is in the point comprised by the wire operation mechanism.

  According to the above-described configuration, the float is urged in the floating direction by pulling the wire operation mechanism, so that the locked state of the holding portion is forcibly released. By attaching one end of the wire to the float side in this way, by pulling the other end of the wire from a position away from the flash gate, the operator can be in a safe position even if it is not located near the dangerous flash gate. You will be able to work.

  In addition to the second feature configuration described above, the third feature configuration is installed such that the other end of the wire operating mechanism floats at an abnormal water level higher than the flush execution water level. Is attached to the second float.

  According to the above configuration, when the upstream water level of the valve body reaches an abnormal water level higher than the flush execution water level, the second float rises, and the float that originally rises at the flush execution water level by the wire connected to the second float. As a result of increasing the buoyancy, the release force with respect to the holding portion increases and is released. When the holding portion is released in this way, the valve body can be tilted by the upstream water pressure.

  In the fourth feature configuration, as described in claim 4, in addition to any of the first to third feature configurations described above, the auxiliary mechanism has a volume above the vicinity of the flush execution water level in the lowered position. Is formed of a float formed so as to be larger than the volume below.

  According to the above-described configuration, the buoyancy acting on the float increases as the upstream water level of the valve body becomes higher than the water level near the flush execution water level, so even if the holding part is clogged with foreign matter, As the value rises, a larger release force acts and the held state can be released.

  In the fifth feature configuration, as described in claim 5, in addition to any one of the first to fourth feature configurations described above, the auxiliary mechanism is a rocker in which the float is attached to one end side. A float interlocking mechanism that releases the holding portion by swinging of the arm, and a moving mechanism that moves the attachment position of the float to the swinging arm in a direction away from the swinging shaft as the float floats. There is in point.

  The swing arm swings due to the floating of the float accompanying the rise of the water level on the upstream side of the valve body and the holding part is released. According to the above configuration, the float to the swing arm is floated as the float floats. As the float floats, the swinging moment applied to the swinging arm increases and the release force on the holding part increases, so the holding state is released more reliably. It will be possible.

  In the sixth feature configuration, in addition to any of the first to fifth feature configurations described above, in addition to any of the first to fifth feature configurations described above, the valve body can be changed from a standing water stop posture to a fall posture. A posture return mechanism for returning the valve body from a falling posture to a standing water stop posture by the accumulated energy, and against the posture return force by the posture return mechanism when the water level abnormally rises. It is in the point provided with the forced fall mechanism which forcibly tilts toward the fall posture.

  According to the above-described configuration, even when foreign matter is clogged between the valve body and the structure body and the valve body does not fall, the forced fall mechanism forces the valve body against the posture return force by the posture return mechanism. In this way, the clogged state of the foreign matter is eliminated, and it is possible to shift to the falling posture.

  As described above, according to the present invention, it is possible to provide a flash gate that does not require external power such as hydraulic pressure or electric power in the event of an abnormality and can be maintained without risk with a simple configuration.

  Embodiments of a flash gate according to the present invention will be described below with reference to the drawings. As shown in FIGS. 1 to 4, the flash gate 1 is a left-right structure in which a swing shaft 9 provided at a base portion forms a gate portion (valve body) 7 at or near a flat bottom portion of a water channel 8. A standing water stop posture (see FIG. 4 (a)) that is pivotally attached between the gate pillars 7A, closes the water channel 8 and stores water upstream of the water channel 8, and opens the water channel 8 to pass downstream. The valve body 2 swingable around the axis P between the water-falling posture (see the solid line in FIG. 4B) and the standing water until the upstream water level of the water channel 8 rises to the flush execution water level HHWL. While maintaining the posture, the posture switching mechanism 3 that allows swinging to the fall posture when the flush execution water level HHWL is reached, and the first posture return for autonomously returning the valve body 2 in the fall posture to the standing water stop posture A mechanism 4 is provided. Here, the gate portion 7 can be made of a metal such as aluminum or SUS, and the valve body 2 can be made of a lightweight member such as aluminum or FRP.

  As shown in FIG. 2, the valve body 2 is formed with notches 27 at both lower ends in the width direction, and in the standing water stop posture, the lower end of the gate portion 7 disposed flush with the bottom of the water channel 8. As shown in FIG. 1, the seal member 2a is attached to the seal surface 7a disposed at the gate pillar 7A at both ends in the width direction of the upstream facing surface 22 as shown in FIG. The end of the notch 27 is in watertight contact with the sealing surface 7b disposed on the bulging portion 7B formed to project from the lower part of the gate pole 7A toward the center through the sealing member 2b. By hitting, it is configured to prevent the outflow of water from the upstream side to the downstream side.

  As shown in FIG. 1, a float accommodating portion 7B whose upper and lower sides are opened is defined on the left side of the upstream side of the gate portion 7, and a float 30 that moves up and down in conjunction with the upstream water level is accommodated therein. Thus, the float 30 rises in conjunction with the water level stored on the upstream side of the water channel 8 so that the flush execution water level can be detected, and the flush cleaning is performed by the wall surface of the float housing portion 7B. A situation in which an abnormal urging force acts on the float 30 due to a water flow at the time of execution or the like is avoided.

  The first posture return mechanism 4 includes a spring case 41 disposed on the left and right pivot portions of the swing shaft 9 of the valve body 2 and a pair of left and right helical springs fixed in a twisted manner in the spring case 41. 40 and a pair of ratchet mechanisms 42 for adjusting the twisting force of the helical spring 40, one end of the helical spring 40 is fixed to the shaft portion 9 of the valve body 2, and the other end is attached to the ratchet mechanism 42. Fixed, so that the return force by the elastic energy accumulated in the helical spring 40 with the posture change from the standing water stopping posture to the falling posture is applied to the vicinity of the lower end portion of the valve body 2, The valve body 2 is swung around the swing axis P so as to autonomously return from the falling posture to the standing water stopping posture. The energy accumulation body is not limited to the helical spring that accumulates elastic energy, and other energy accumulation bodies such as a compression spring and a gas damper using a compressed gas may be appropriately selected and configured.

  As shown in FIGS. 1, 2, 4, and 5, the second gate portion 7 (7 </ b> A) is applied with a return force to the standing water stop posture when the first posture return mechanism 4 is urged to return. A swing weight mechanism 5 is provided as a posture return mechanism. The swinging weight mechanism 5 includes a weight 5a and a swinging arm 5b to which the weight 5a is attached. The base end side of the swinging arm 5b is connected to the swinging shaft 9 of the valve body 2. 6 are connected. The connection mechanism 6 includes, for example, an inner shaft (not shown) that is inserted into the end portion of the swing shaft 9 that extends into the spring case 41 via a key groove and rotates integrally with the swing shaft 9. A sleeve 61 fitted to the outside of the inner shaft via a keyway, a pin 62 attached to the other end of the sleeve and projecting in the radial direction, and a connecting member 63 fitted and fixed to the sleeve 61. can do.

  The connecting member 63 is integrally formed on the base end side of the swing arm 5b, and moves around the axis P in conjunction with the swing of the valve body 2 from the standing water stopping posture to the falling posture. A long hole 63a that allows free rotation within a predetermined range with respect to the rotating pin 62 is formed. As shown in FIG. 5A, the pin 62 is positioned on the upper end side of the elongated hole 63a when the valve body 2 is in the standing water stopping posture, and the pin rotates as the valve body 2 tilts. As shown in FIG. 5B, the pin 62 is positioned on the lower end side of the long hole 63a when tilted by a predetermined angle, here, about 20 degrees, as shown in FIG. 5B. It is configured. As shown in FIG. 5C, when the valve body 2 further tilts and the pin 62 comes into contact with the lower end side of the elongated hole 63a, torque is transmitted to lift the weight 5a, and the valve body The weight 5a ascends around the pivot axis P with the swinging to the falling posture of 2. That is, the connection mechanism 63 includes the valve body 2 as a dead area in which a return moment, which will be described later, does not act on the valve body 2 during a predetermined fall angle from the standing water stop posture to the fall posture. A play mechanism is provided in which the return force does not act at the initial stage of swinging from the standing water stopping posture to the falling posture.

  Further, the swinging weight mechanism 5 can be detachably fixed by a bolt so that the mounting position of the weight 5a can be adjusted within a predetermined range along the longitudinal direction on the other end side of the swinging arm 5b. It is configured.

  As shown in FIG. 1 to FIG. 3, the posture switching mechanism 3 includes an engaging portion 32 installed on the left and right gate portions 7 (7 </ b> A) to which the valve body 2 is separated and connected, and the valve body 2 is installed on the valve body 2. A holding part 31 provided with a locking piece 33 that engages with the engaging part 32 and maintains the standing water stop posture; a mechanism that releases the holding state by the holding part 31; the float 30; and the float 30 includes a float interlocking mechanism 34 that allows the locking piece 33 to be retracted from the engaging portion 32 and allowed to swing to a falling posture when the flushing water level HHWL rises.

  The holding portion 31 further includes a holding biasing mechanism including a link mechanism 31a attached to the valve body 2 and connecting rods 31b and 31c connected to both ends of the link mechanism 31a, and the connecting rods 31b and 31c. A locking piece 33 is attached to the front end of the link mechanism 31 and the link mechanism 31a is urged in the opening direction via a spring mechanism 31d so that the locking piece 33 protrudes to the side of the valve body 2. The link mechanism 31a includes a first link 31e whose central portion is swingably fixed to the valve body 2, and a turnbuckle 31g between both ends of the first link 31e and the connecting rods 31b and 31c. The spring mechanism 31d is attached between the first link 31e and the valve body 2 so that the first link 31e is in a substantially horizontal posture. Thus, the locking piece 33 is configured to protrude laterally.

  After the flush cleaning, when the valve body 2 returns to the standing water stop posture from the fall posture by the posture return mechanism 4, the tapered surface 33a formed on the locking piece 33 comes into contact with the engaging portion 32, and the reaction force thereof. Thus, the link mechanism 31a operates in the closing direction against the urging force of the spring mechanism 31d, and after passing through the engaging portion 32, the link mechanism 31a is again urged in the opening direction to lock the engaging portion 32. The piece 33 is configured to be engaged.

  The turnbuckles 31g provided at both ends of the pair of second links 31f act as a timing adjustment mechanism, and when the flash execution water level is reached by adjusting any of the turnbuckles 31g, It is configured to be adjustable so as to be released at the same time.

  As shown in FIGS. 3A, 3B, and 3C, the float interlocking mechanism 34 includes a first arm 30a as a swing arm having one end fixed to the float 30, and the first arm 30a. Of the second arm 30c fixed to the swinging shaft 30b and swinging in conjunction with the swinging arm 30a, the "<"-shaped arm 34a interlocking with the swinging of the second arm 30c, and the "<"-shaped arm 34a. An L-shaped member 34c that pushes the connecting rod 31b by swinging and biases the pantograph mechanism 31a in the closing direction. Here, the L-shaped member 34c is fixed to the end of the connecting rod 31b.

  That is, when the stored water level on the upstream side of the water channel rises and the float 30 moves upward, the first arm 30a swings downward around the swing shaft 30b and swings downward in conjunction therewith. When the "<"-shaped arm 34a attached to the second arm 30c swings around the swing shaft 34b, the L-shaped member 34c is pressed by the tip of the "<"-shaped arm 34a. Thus, the engaged state of the engaging portion 32 and the locking piece 33 is released. At this time, the other holding portion 31 is also released through the link mechanism 31a. In other words, the urging holding mechanism is configured to function as a release mechanism that releases the other holding portion 31 simultaneously with the operation of the float interlocking mechanism 34.

  Further, as shown in FIG. 4, a water storage section 50 is provided on the upstream facing surface of the water channel 8 in the valve body 2 to temporarily store the upstream water in the falling posture and maintain the falling posture. The water reservoir 50 includes an upper end edge 50a and side end edges 50b provided on the left and right sides, and the upstream facing surface and the lower end surface of the water reservoir 50 are open to the water channel. A V-shaped drainage port 51 is formed in the upper end side edge portion 50a of the valve body 2 to allow the water stored in the water storage portion 50 to flow downstream.

  The upstream water level of the water channel 8 reaches the flush execution water level, and a part of the water stored on the upstream side in the water storage section 50 accumulates at the time of transition from the standing water stopping posture to the falling posture, and flows out from the drain port 51 little by little. To do. The valve body 2 in the fall posture is subjected to a self-recovery return force to the standing water stop posture by the posture return mechanism 4 and a return moment by the swinging weight mechanism 5, but the weight of the water stored in the water storage unit 50 Thus, the valve body 2 is configured to be surely maintained in the fall posture until the end of the flush cleaning.

  Further, a drain port area adjusting mechanism for variably adjusting the opening area of the drain port 51 is provided so that the falling posture can be reliably maintained for a predetermined time during flush cleaning in the installation environment of the flash gate. Specifically, the member at the drainage port 51 portion is detachably attached to the upper edge portion 50a of the water storage unit 50 by a fastening tool such as a bolt, and can be replaced with various drainage ports 51 having different opening areas. In addition, a plate-like body in which a plurality of V-shaped slits having different angles or gaps are formed is slidably attached to the edge portion 50a, and a central portion of the edge portion 50a is attached. You may comprise so that the shape of the slit located in opening can be variably set by a slide movement. Note that the shape, quantity, and quantity of the opening are not limited thereto.

  In addition, when the member at the drainage port 51 is made of an antibacterial metal such as copper or silver or is surface-treated with an antibacterial agent, the flash gate is installed in a sewage pipe. In addition, it is configured to avoid a situation in which a biofilm or the like adheres to and clogs a drainage port portion subjected to antibacterial treatment.

  In addition, although the above-mentioned flush gate demonstrated what was comprised so that the valve body 2 might be hold | maintained by the attitude | position holding | maintenance part in a substantially perpendicular attitude | position in the standing still water attitude | position, as shown in FIG. The posture of the valve body 2 in the posture is not necessarily a vertical posture, and is held in a posture inclined in the downstream direction of the water channel (the posture shown by a solid line in the drawing) as shown in FIG. Also good. In this case, the position of the center of gravity of the valve body 2 and the upstream water located on the horizontal projection surface of the valve body 2 in the standing water posture near the flush execution water level is the valve body 2. Since the valve body 2 receives a moment in the direction of falling by the water in the water channel 8 in the standing water stopping position in the vicinity of the flush execution water level, the valve body 2 is configured to be positioned on the downstream side of the swing axis of the valve body. It will also be subject to the falling moment due to, and will be able to quickly shift to the falling posture during the flush execution.

  According to the flash gate 1 described above, the flush execution water level is reached, the holding unit 31 is released by the posture switching mechanism 3, and the valve body 2 is turned from the standing water posture to the falling posture by the water pressure of the upstream stored water. In the initial stage of slight tilting, since the return force by the swing weight mechanism 5 does not act due to the insensitive area, the swing mechanism smoothly swings, and after the play is eliminated, the valve body 2 is swung by the swing inertia force. While lifting the weight 5a, the posture is changed to a falling posture at a stretch and flush cleaning is performed. In the falling posture, the falling posture is maintained by the weight of the water stored in the water storage section 50, and the flush cleaning is surely performed. Thereafter, when the stored water in the water storage section 50 flows out, the posture returning force to the standing water stopping posture by the posture returning mechanism 4 exceeds the weight of the valve body, and the returning operation is started. Even when the posture return force is set to be somewhat weak, it is possible to return to the standing water stop posture at once by the action of the return moment by the swinging weight mechanism 5.

  According to the flash gate 1 described above, after the ratchet gear 42b is rotated using a predetermined jig in the initial stage of installation to twist the helical spring 40 to adjust the return biasing force, Since the return urging force can be appropriately adjusted by adjusting the mounting position of 5a to the swing arm 5b, the subsequent flushing operation can be performed very smoothly.

  In the flash gate 1 described above, various solid foreign matters floating in the water at the time of flush cleaning adhere to the valve body and the gate portion, and then the foreign matter is clogged in the holding portion 31 of the valve body 2 that has returned to the standing water stop posture, In preparation for the case where the release of the holding part 31 is prevented even if the upstream water level rises again to the flush execution water level and the buoyancy of the float 30 acts, An auxiliary mechanism 70 that raises the release force is provided.

  As an example, the auxiliary mechanism 70 is attached to an attachment hole formed at one end of the float 30 side, that is, the end of the first arm 30a on the float attachment side, and urges the float 30 in the floating direction. A first wire operating mechanism including one wire 71 can be used.

  As shown in FIG. 7A, the first wire 71 is relaxed when the above-described flash gate 1 is installed in a manhole M in which the upstream sewage pipe 8A and the downstream sewage pipe 8B of the natural flow type are communicated. In this state, the other end is hooked on the locking fitting 73 provided on the side wall in the vicinity of the opening M1 of the manhole M, and when the inconvenience that the release of the holding portion 31 is prevented occurs. 7 (b), the first wire 71 is removed from the locking fitting 73 and pulled, and the first arm 30a is swung around the swing shaft 30b to release the holding portion 31. be able to.

  That is, the holding portion 31 can be released without performing dangerous work at the bottom of the manhole M in which a large amount of sewage is stored on the upstream side.

  In the present embodiment, in addition, in case the foreign body is clogged between the valve body 2 and the left or right gate pillar 7A, and the holding part 31 is released by the buoyancy of the float 30, the water level is not prepared. Forced overturning provided with a second wire 72 that forcibly tilts the valve body 2 toward the overturned posture against the posture return force by the swing weight mechanism 5 when the rise is higher than the flush execution water level. A second wire operating mechanism is provided as an example of the mechanism.

  One end of the second wire operating mechanism is attached to a mounting hole formed on the distal end side of the weight 5a or the swing arm 5b of the swing weight mechanism 5, and the swing arm 5b is pulled upward and biased. The second wire 72 is made up of.

  As shown in FIG. 7A, in a state where the second wire 72 is relaxed, the other end is hooked on the locking fitting 73, and the tilting to the fall posture is performed even if the holding portion 31 is released. 7B, when the second wire 72 is detached from the locking fitting 73 and pulled, the swing arm 5b is pulled upward. Thus, the posture of the valve body 2 can be switched to the falling posture.

  The second wire operating mechanism can also be suitably used when it is necessary to maintain the valve body 2 in a falling position continuously due to a large amount of rain, and the second wire is moved after the valve body 2 has shifted to the falling position. It is also possible to maintain the falling posture by fixing 72 to the locking metal fitting 73 in the pulled state. This makes it possible to avoid damage to the flash gate and flooding even in heavy rainfall.

  The upward pulling operation is not limited to human power, and a float for applying a tensile force may be attached to the other end of the second wire. This float may be arranged so that a tensile force is applied to the wire by buoyancy at a position above the flush execution water level. Further, the forced overturning mechanism is not limited to the one using a wire, and a rigid body having bending rigidity may be used instead of the wire or a link mechanism may be used.

  Further, as shown in FIG. 8 (a), the first wire operation mechanism 71 has a flush execution water level or a float support part 74 fixed above the flush execution water level so as to rise above an abnormal water level higher than the flush execution water level. A second float 75 may be provided, and the other end of the first wire 71 may be attached to the second float 75.

  According to the above-described configuration, when the upstream side water level rises to an abnormal water level higher than the flush execution water level when the release of the holding unit 31 is hindered even if the buoyancy of the float 30 acts as the water level rises. As shown in FIG. 8B, the second float 75 floats from the float support portion 74 and pulls up and biases the first arm 30 a through the first wire 71. At this time, since the buoyancy of both the float 30 and the second float 75 acts on the first arm 30a, the first arm 30a swings around the swing shaft 30b, and the holding portion 31 It will be released.

  Furthermore, as shown in FIG. 9, the float 30 is preferably formed such that the volume above the predetermined flush execution water level is larger than the volume below at the lowered position where the water level does not reach the float. When the first arm 30a does not swing even if the foreign matter is entangled with the holding portion 31 and the water level rises above the flush execution water level, the volume in which the float 30 is submerged rapidly increases as the water level rises. A big buoyancy will be generated. For this reason, the swinging force acting on the first arm 30a is rapidly increased, whereby the holding portion 31 is released. In order for the holding unit 31 to be released even if there is some entanglement of foreign matter, the float 30 has a volume above the flush execution water level at the lowered position that is at least 2 to 3 times the volume below the lower volume. It is preferably set.

  Moreover, it is preferable to provide a biasing mechanism that biases the release force of the holding portion 31 by the float interlocking mechanism 34 so as to increase as the float 30 rises. More specifically, as shown in FIG. 10A, a long hole 30d is formed on one end side of the first arm 30a, and the float 30 is moved through a bracket 30e that is slidable along the long hole 30d. At the same time, the urging mechanism is configured by slidably attaching the float 30 that floats with rising water level to a slit formed in the inclined guide 30f inclined obliquely upward. That is, the urging mechanism is constituted by a moving mechanism that moves the attachment position of the float 30 to the swing arm 30a away from the swing shaft 30b as the float 30 floats.

  As shown in FIGS. 10B and 10C, when the float 30 rises along the inclined guide 30f as the water level rises, the bracket 30e moves along the long hole 30d to the end of the first arm 30a. Therefore, the rotational moment around the rocking shaft 30b acting on the first arm 30a increases as the float 30 floats, and the release force on the holding portion 30 increases.

  The attachment mechanism of the float 30 to the inclined guide 30f is not limited to the above-described configuration. For example, as shown in FIGS. 11 (a), 11 (b), and 11 (c), a pair of floats 30 are provided on both sides. A rail-shaped inclined guide 30f may be installed, and the float 30 may be movably attached via a bracket 30g between the rails 30f.

  In the embodiment described above, the swing weight mechanism 5 is provided on one gate portion 7A. However, the swing weight mechanism 5 is provided on both the left and right gate portions 7A. It may be connected to both ends of the swing shaft 9. In this case, the second wire 72 may be provided on both sides.

  The above-described embodiment is an example of the present invention, and the material, size, structure, and the like of each component constituting the flash gate can be appropriately selected or changed and designed according to the specific configuration described above. However, the range is not limited.

Schematic plan view of the flash gate Schematic front view from the downstream side of the flash gate Explanatory drawing of the main part of the float interlocking mechanism Explanatory drawing of the flash gate that changes the posture of the valve body from a standing still water posture to a falling posture Operational explanation of weight function Explanatory drawing of the valve body in which the standing water stopping posture is realized in an inclined posture It is explanatory drawing of an auxiliary mechanism when a flash gate is installed in a manhole, (a) is explanatory drawing when a valve body is in a standing water stop posture, and an auxiliary mechanism is a non-operation state, (b) is a valve body Explanatory drawing when is in a fall position and the auxiliary mechanism is in the operating state Explanatory drawing when the auxiliary mechanism is configured using the second float Illustration of float shape Explanatory drawing of the moving mechanism which moves so that the releasing force of a holding part may become large as the float rises Explanatory drawing of the moving mechanism which shows another embodiment and moves so that the releasing force of a holding | maintenance part becomes large as the float raises

Explanation of symbols

1: Flash gate 2: Valve body 3: Posture switching mechanism 4: First posture return mechanism 5: Second posture return mechanism (oscillating weight mechanism)
5a: Weight 5b: Swing arm 6: Connection mechanism 30: Float 31: Holding unit 50: Water storage unit 51: Drain port 70: Auxiliary mechanism 71: First wire 72: Second wire 75: Second float

Claims (6)

A valve body pivotally supported between a standing water stopping posture for closing the water channel and a falling posture for opening the water channel, with a base portion pivotally supported by the left and right structures at or near the bottom of the water channel;
A holding portion that holds the valve body in a standing water posture against the pressure of water until the upstream water level of the water channel rises to the flush execution water level is raised or lowered according to the water level when the flush execution water level is reached. A flush gate provided with a posture switching mechanism that is released in conjunction with a moving float and allows the valve body to tilt to a falling posture due to the pressure of the water;
A flash gate provided with an auxiliary mechanism for increasing the releasing force of the holding part by the float when the water level rises.   The flash gate according to claim 1, wherein the auxiliary mechanism is configured by a wire operation mechanism that is attached at one end to the float side and urges the float in a floating direction.   The flash gate according to claim 2, wherein the other end of the wire operating mechanism is attached to a second float installed so as to float at an abnormal water level higher than the flush execution water level.   The flash gate according to any one of claims 1 to 3, wherein the auxiliary mechanism is configured by a float formed so that a volume above the vicinity of the flush execution water level is larger than a volume below the lowering position.   The auxiliary mechanism includes a float interlocking mechanism that releases the holding portion by swinging of the swing arm having the float attached to one end side, and the float is attached to the swing arm as the float floats. The flash gate according to claim 1, comprising a moving mechanism that moves in a direction away from the swing shaft.   With a posture return mechanism that returns the valve body from the falling posture to the standing water posture by the energy accumulated with the posture change from the standing water posture of the valve body to the falling posture, when the water level abnormally rises, 6. The flash gate according to claim 1, further comprising a forcible tipping mechanism that forcibly tilts the valve body toward a tipping posture against a posture returning force by the posture returning mechanism.

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