JP7415829B2 - Fall prevention fence - Google Patents

Description

The present invention relates to fall prevention fences installed on embankments etc. for the purpose of preventing falls of people and cars, and in particular, the present invention relates to fall prevention fences installed on embankments etc. for the purpose of preventing falls of people and cars, and in particular, the present invention relates to fall prevention fences installed on embankments etc. for the purpose of preventing falls of people and cars. Regarding fall prevention fences installed near water outlets).

Water used at power plants is released into rivers, oceans, etc. through spillways. As shown in Fig. 18(a), when cars and people are allowed to enter close to the outlet of the waterway 56 (water outlet 54), the system shown in Fig. 18(b) is designed to prevent falling accidents. A fall prevention fence 50 as shown is installed on the ground 53 near the boundary with the river. Note that FIG. 18(a) is a diagram showing an example of a location where the fall prevention fence 50 is installed. The broken lines in the figure represent the part where the underground waterway is formed, and the small circles arranged in a row along the river represent the pillars 51 that constitute the fall prevention fence 50. Moreover, FIG.18(b) has shown the state which looked at the fall prevention fence 50 from the river side in FIG.18(a).

If the water level of a river rises due to heavy rain, etc., and the fall prevention fence is submerged in water, there is a risk that the fall prevention fence may be damaged or deformed due to collision with the flowing earth and sand or the force received from the water flow. There is. Therefore, if the water level of the river is predicted to rise due to heavy rain, etc., the fall prevention fence 50 is manually removed before the river water level rises and the fall prevention fence 50 is submerged, and the river returns to its original state. After the water level returned, the fall prevention fence 50 was installed again. However, since the fall prevention fence 50 has a structure in which a large number of pillars 51 are connected to each other via wires 52, it is not easy to remove or restore them every time heavy rain etc. occur. . As described above, the conventional fall prevention fence 50 has had the problem of requiring an extremely large amount of time and cost for its removal and restoration work.

Although it is not installed on a river embankment or the like, for example, Patent Document 1 discloses an invention called "Entry Protection Fence" that relates to a fence used for the purpose of preventing vehicles and people from entering.
The invention disclosed in Patent Document 1 connects a fence portion that protrudes above the ground, a sheath pipe that is disposed underground to cover the fence portion and is formed to be able to accommodate the fence portion. It has a structure with a chain.
According to such a structure, the fence can be buried underground when not in use.

Furthermore, Patent Document 2 discloses an idea regarding a pole, which is named "traffic regulation pole" and is installed at the entrance of a parking lot to regulate the entry of vehicles.
The invention disclosed in Patent Document 2 includes a base material that is buried in the ground and has an opening at the top, a columnar member housed inside the base material so as to be able to emerge and retract from the opening, and one end at the lower end of the columnar member. It is equipped with a string-like body connected to each other and a chain that connects the two columnar members, and the columnar member is pulled up by pulling the string-like body.
According to such a structure, the pole can be raised and lowered without using an actuator such as hydraulic pressure.

Patent Document 3 discloses an invention related to a safety fence for blocking the passage of cars and people under the name "fence post."
The invention disclosed in Patent Document 3 includes an outer cylinder that is buried underground, a mounting cylinder that is attached to the inside of the upper part of the outer cylinder, and a drawer that is smaller in diameter than the inner diameter of the mounting cylinder and that is attached to the outer cylinder. , is equipped with a column that can be inserted in a freely retractable manner, and an engagement pin is provided on the column so as to protrude outward on both sides in the radial direction, and the movement of the engagement pin in the axial direction and circumferential direction is restricted. It has a structure in which a hook-shaped locking groove is provided on the mounting cylinder.
According to such a structure, the pillar bodies that constitute the fence post can be easily buried underground.

Japanese Patent Application Publication No. 2005-42340 Utility Model Publication No. 6-4118 Utility Model Publication No. 05-87016

When the invention disclosed in Patent Document 1, which is the prior art described above, is used as a fall prevention fence installed on a river embankment, etc., the fence part is buried underground in the event of flooding, thereby preventing collisions with earth and sand, etc. However, the task of manually burying a large number of fence sections underground every time there is heavy rain, etc. is a difficult task, so there was a problem that it could not be done efficiently in a short period of time.

When the invention disclosed in Patent Document 2 is installed as a fall prevention fence on a river embankment, etc., by burying the poles underground, it is possible to prevent damage due to collision with earth and sand during flooding. . Furthermore, when the pole is to be used again, the pole is raised by pulling the string-like body, so it can be returned to its original state relatively quickly. However, since the poles must be raised and lowered by people, if there are a large number of poles, it may be difficult to bury or restore all the poles every time there is heavy rain.

The device disclosed in Patent Document 3 has a structure in which the pillar bodies constituting the fence post can be buried underground, so when the fence post is installed on a river embankment or the like and used as a fall prevention fence. By burying the columns underground before the river water level rises due to heavy rain, etc., it is possible to prevent their damage. However, when there are a large number of columns to be installed, it is not easy to bury them all underground in a short time.

The present invention has been made in response to such conventional circumstances, and is installed near the outlet (water outlet) of the spillway that discharges water used in power plants into rivers, and is installed near the outlet (water outlet) of the waterway that discharges water used in power plants into rivers. To provide a fall prevention fence that does not need to be removed even if the water level of a river rises.

In order to achieve the above object, the first invention provides a fall prevention fence installed near the outlet of a drainage channel formed underground, which has a long columnar shape and is directed perpendicularly to the central axis. A first support having a first support main body with a first locking part provided on the side surface thereof so as to protrude from the center; a second strut having a second strut body with two locking parts provided on the side surface; a fixture attached to the upper side of the first strut body and the second strut body, respectively; A connecting body that connects the first support column and the second support column via a tool, and a size that allows the first support column and the second support column to be inserted loosely therein, and the inner circumferential surface thereof has a circular shape in plan view. None, a first column insertion hole and a second column insertion hole formed parallel to the vertical direction from the ground surface, and protruding outward from the inner peripheral surface of the first column insertion hole parallel to the radial direction of the circle, and is formed parallel to the vertical direction so as to have a size that allows the first locking part to be placed inside, and the first support main body is loosely inserted into the first support insertion hole. a first guide part that guides the locking part in the vertical direction; and a second guide part that protrudes outward from the inner circumferential surface of the pillar insertion hole in parallel to the radial direction of the circle, and a second guide part that guides the second locking part inside. The second stopper is formed parallel to the vertical direction so as to have a size that allows for placement, and guides the second locking part in the vertical direction when the second support main body is loosely inserted into the second support insertion hole. The second support insertion hole is formed above the waterway so that the open lower end communicates with the waterway, and the second support is a blade member made of a flat plate material. is parallel to the radial direction of the circle formed by the edge of the second support main body, the tip side end surface projects outward from the edge, and the flat surface is parallel to the vertical direction, It is characterized in that it is installed on the lower end surface that protrudes into the waterway from the lower end of the second column insertion hole.

In the first invention, when the first column body is loosely inserted into the first column insertion hole, the first column is centered around the central axis of the first column body by the first column insertion hole. The state in which the part above the first locking part is exposed above the ground unless the first locking part is vertically aligned with the first guide part. It has the effect of maintaining the
In addition, when the second strut body is loosely inserted into the second strut insertion hole, the second strut can freely rotate around the central axis of the second strut body through the second strut insertion hole. At the same time, unless the second locking part is vertically aligned with the second guide part, the part above the second locking part remains exposed above the ground. It has an effect.

Furthermore, in the first invention, when the water level in the spillway rises due to heavy rain, etc., and the submerged blade member receives the force of the water flowing in the spillway, the second support is moved to the center of the second support main body. When the blade member rotates around the shaft and the second locking part aligns with the second guide part in the vertical direction, the second support falls due to its own weight and is exposed above the ground. This has the effect that a part of the previously used part is stored in the second column insertion hole.
In addition, the first support that is loosely inserted into the first support insertion hole with the first locking part not vertically aligned with the first guide part connects itself and the second support. If the connecting body is not parallel to the vertical plane that includes the central axis of the first pillar body and the central axis of the second pillar body, the tensile force of the connecting body that occurs as the second pillar falls When it rotates and the first locking part aligns with the first guide part in the vertical direction, it falls due to its own weight, and a part of the part that was exposed above the ground becomes the first support. It has the effect of being stored in the insertion hole.
The first support that is loosely inserted into the first support insertion hole with the first locking part not vertically aligned with the first guide part connects itself to the other first support. If the connecting body is not parallel to the vertical plane that includes the central axis of itself and the other first pillar bodies, it will rotate due to the tensile force of the connecting body that occurs as the other first pillar body falls, When the first locking part aligns with the first guide part in the vertical direction, it falls due to its own weight, and a part of the part that was exposed above the ground is stored in the first support insertion hole. It has the effect of being

A second invention is a second invention based on the first invention, which has a keyhole-shaped first through hole consisting of a first insertion hole and a first guide hole, and is installed above the first support insertion hole. A first driven gear rotatably holds a first support post loosely inserted into the first through hole, and a keyhole-shaped second through hole consisting of a second insertion hole and a second guide hole. and a first driving gear that is installed above the second pillar insertion hole and rotatably holds the second pillar that is loosely inserted into the second through hole, a first driven gear, and a first driven gear. a drive belt wound around a drive gear; the first guide hole allows the first locking portion to be loosely inserted into the first guide hole with the first support main body being loosely inserted into the first insertion hole; The second guide hole has a size that allows the second locking part to be inserted loosely in a state where the second support main body is loosely inserted into the second insertion hole. This is a characteristic feature.

In addition, in the present invention, the first driven gear having a keyhole-shaped first through hole consisting of a first insertion hole and a first guide hole is provided through an insertion hole 21a and a guide hole 21b, which will be described later in Example 3. A keyhole-shaped second through-hole consisting of a second insertion hole and a second guide hole corresponds to the first gear 21 into which the first support 5 is loosely inserted. The first drive gear has a keyhole-shaped through hole consisting of an insertion hole 21a and a guide hole 21b, which will be described later in Embodiment 3, and corresponds to the first gear 21 into which the second support 6 is loosely inserted. There is.

In the second invention having the above structure, when the support main body and the first locking part of the first support are loosely inserted into the first insertion hole and the first guide hole at the same time, the first support The first driven gear has the function of allowing the first pillar to move in the vertical direction while restricting rotation about the central axis of the pillar body.
In addition, in the second invention, when the water level in the spillway rises due to heavy rain, etc., and the submerged blade member receives the force of the water flowing in the spillway, the second support is moved from the central axis of the second support main body. When the blade member rotates with the blade member as the center, and the second locking part aligns with the second guide part in the vertical direction, the second support falls due to its own weight and is exposed above the ground. A part of the part that was previously inserted is stored in the second column insertion hole.
Then, the first driven gear, which is connected via the drive belt to the first driving gear that rotates as the second support column rotates, rotates, and together with this first driven gear, the first driven gear rotates. As a result of the rotation of the column, when the first locking part becomes aligned with the first guide part in the vertical direction, the first column falls due to its own weight, and the part that was exposed above the ground A part of the column is stored in the first column insertion hole.
In this way, in the second invention, in addition to the effect of the first invention, the rotation of the second support is transmitted to the first support through the first drive gear, the drive belt, and the first driven gear. It has the effect of being transmitted.

A third invention is the first invention or the second invention, in which a desired support is provided in a direction parallel to the vertical direction from the ground surface so as to protrude outward from the inner circumferential surface of the first pillar insertion hole in parallel with the radial direction of the circle. The first widened part is formed to a depth of , and the second pillar insertion hole is formed to a desired depth in parallel to the vertical direction from the ground surface so as to protrude outward from the inner peripheral surface in parallel to the radial direction of the circle. a second widened part, the length of the first widened part in the vertical direction is longer than the length of the first locking part in the central axis direction of the first support body; , the minimum length along the circumferential direction of the first pillar insertion hole of the first widened part is the maximum length of the first pillar insertion hole of the first guide part along the circumferential direction. and the maximum length along the circumferential direction of the first support main body of the first locking part, and The minimum length of the second guide part in the circumferential direction of the second pillar insertion hole and the second locking part in the circumferential direction of the second pillar body The first widened portion is provided above the first guide portion and has a width larger than the sum of the maximum lengths along the circumferential direction of the first support main body of the first support portion of the first locking portion on the bottom surface. A first opening having a width wider than the maximum length along is formed to communicate with the first guide part, and a second widened part is formed above the second guide part. A second opening having a width wider than the maximum length along the circumferential direction of the second support main body of the second locking portion on the bottom surface communicates with the second guide portion. It is characterized by being formed as follows.

When the first support main body is loosely inserted into the first support insertion hole and the lower end of the first locking part is engaged with the bottom surface of the first widened part, the first support is Since the first widened portion prevents downward movement, the portion above the first locking portion is exposed above the ground. At this time, the first strut can rotate about the central axis of the first strut main body within a range in which the first locking part can move inside the first widened part.

In addition, if the lower end of the second locking part is locked to the bottom surface of the second widened part with the second support main body loosely inserted into the second support insertion hole, the second support is prevented from moving downward by the second widened portion, so that the portion above the second locking portion is exposed above the ground. At this time, the second support column can be rotated about the central axis of the second support support body within a range in which the second locking part can move inside the second widened part.

That is, in the third invention, in addition to the effects of the first invention or the second invention, the first widening part stores the first locking part therein, and the central axis of the first support main body is aligned with the first widening part. The first support is held while allowing rotation around the center within a predetermined rotation angle range, and the second widened part stores the second locking part inside, and the second support supports the second support. It has the function of holding the second support column while allowing rotation about the central axis of the main body within a predetermined rotation angle range.

A fourth invention is based on the third invention, in which a first cylindrical tube having a size that allows the first support to be loosely inserted therein is installed inside the first support insertion hole, and A first wall plate is installed to cover the inner surfaces of the widened part and the first guide part, and the first cylindrical tube communicates with the first widened part and the first guide part, and A first slit having a width that allows the locking part to be placed inside is provided on the side surface, and a first space surrounded by a first wall plate in the first widened part is a first cylindrical tube. The first locking part has a size that allows it to rotate within a desired rotation angle range about the central axis when the first support main body is loosely inserted into the first guide part. The width of the second space surrounded by the first wall board is narrower than the width of the first space.
In the fall prevention fence having such a structure, in addition to the effect of the third invention, the first cylindrical tube and the first wall plate are connected to the first support insertion hole, the first widened part, and the first guide, respectively. It has the function of preventing parts from deforming and maintaining their shape.

In a fifth invention, in the third invention or the fourth invention, a second cylindrical tube having a size that allows the second support to be inserted loosely therein is installed inside the second support support hole. At the same time, a second wall plate is installed to cover the inner surfaces of the second widened part and the second guide part, and the second cylindrical tube communicates with the second widened part and the second guide part, A second slit having a width that allows the second locking part to be placed inside is provided on the side surface, and a third space surrounded by the second wall plate in the second widened part is The second locking part has a size that allows it to rotate within a desired rotation angle range about the central axis when the second support main body is loosely inserted into the second cylindrical tube, and The width of the fourth space surrounded by the second wall plate in the second guide portion is narrower than the width of the third space.
In the fall prevention fence having such a structure, in addition to the effects of the third invention or the fourth invention, the second cylindrical tube and the second wall plate are provided with the second support insertion hole and the second widened part, respectively. It also has the function of preventing deformation of the second guide part and maintaining its shape.

A sixth aspect of the present invention is that in the second aspect, the lower end of the cylindrical body is replaced with the first column insertion hole into which the first column is loosely inserted and the second column insertion hole into which the second column is loosely inserted. A first storage device that has a closed shape and has a stepped structure in which a pair of large diameter portions are provided above and below a small diameter portion, into which the first support is loosely inserted, and into which the second support is loosely inserted. a second storage device; and a first storage device insertion hole whose inner peripheral surface forms a circle in plan view, is formed parallel to the vertical direction from the ground surface, and into which the first storage device is rotatably inserted. and a second storage device insertion hole into which the second storage device is rotatably inserted, and a storage device insertion hole in place of the first drive gear and the first driven gear. and a second driven gear and a second drive gear which are fixedly installed in an extrapolated state on the upper part of the first storage device and the second storage device, respectively, and the first storage device and the second storage device The small diameter part of the storage device No. 2 has a size that allows the first support and the second support to be loosely inserted therein, and the inner circumferential surface is circular in plan view and is formed parallel to the vertical direction. A pillar insertion hole and a size that protrudes outward from the inner circumferential surface of the pillar insertion hole in parallel to the radial direction of the circle, and that allows the first locking part and the second locking part to be placed inside, respectively. A column guide groove is formed parallel to the vertical direction so that the second storage device insertion hole has an open lower end that communicates with the waterway, and a second storage device insertion hole is formed above the waterway so that the open lower end communicates with the waterway. The belt is wound around the second driven gear and the second driving gear instead of the first driven gear and the first driving gear, and the belt is wound around the second driven gear and the second driving gear instead of the first driven gear and the first driving gear. It is characterized in that a plurality of rotary blades constituting the type water turbine are installed on the lower end surface of the second storage device that protrudes into the spillway.

In the sixth invention of the above structure, in addition to the effect of the second invention, when the first pillar main body is loosely inserted into the pillar insertion hole of the first storage device, the first pillar is The first support is held rotatably about the central axis of the first support body by the insertion hole, and unless the first locking portion is vertically aligned with the support guide groove of the first storage device. This has the effect that the locking portion remains locked to the upper surface of the small diameter portion of the first storage device.
Further, when the second column main body is loosely inserted into the column insertion hole of the second storage device, the second column can freely rotate around the central axis of the second column body through the column insertion hole. and the second locking portion is locked to the upper surface of the small diameter portion of the second storage device unless the second locking portion is vertically aligned with the column guide groove of the second storage device. It has the effect of maintaining the same state.

Furthermore, in the sixth invention, when the water level in the spillway rises due to heavy rain, etc., and the submerged rotor blades receive the force of the water flowing in the spillway, the second storage device moves the second storage device to the second support main body. When the second locking part rotates with the rotor around the central axis and vertically aligns with the column guide groove of the second storage device, the second column falls due to its own weight and falls to the ground. A part of the portion exposed above is stored in the second storage device.
A second driven gear, which is connected via a drive belt to a second drive gear that rotates together with the second storage device, rotates together with the first storage device, and the second driven gear rotates together with the first storage device. When the stop part is vertically aligned with the column guide groove of the first storage device, the first column falls due to its own weight, and a part of the part that was exposed above the ground falls into the first column. Stored in a storage device.
In this way, in the sixth invention, in addition to the effect of the second invention, the rotation of the second storage device is caused by the rotation of the second storage device via the second drive gear, the drive belt, and the second driven gear. It has the effect of being transmitted to the device.

A seventh invention is a first cylindrical body and a second cylindrical body which are respectively fitted onto the first support main body and the second support main body in the invention according to any one of the first invention to the sixth invention. and a cylindrical bellows member that connects the first cylindrical body and the second cylindrical body to each other and has an inner diameter larger than the outer diameter of the first column main body and the second column main body. , the fixtures are attached to the outer peripheral surfaces of the first cylindrical body and the second cylindrical body, respectively, the first cylindrical body is fixed to the first column body and the second column body, respectively, The cylindrical body is characterized in that it is movably installed below the first cylindrical body along the central axis of the first support main body or the second support main body.

In the fall prevention fence having such a structure, in addition to the effects of any one of the first to sixth inventions, when the first support main body or the second support main body falls, the bellows member shrinks and the second cylindrical body moves along the central axis of the first strut body or the second strut body in a direction approaching the first cylindrical body, and is connected to the second cylindrical body via a fixture. The connected body also moves together with the second cylindrical body.

In the first invention, when the water level in the spillway rises due to heavy rain or the like and the blade member is submerged, the second support, which rotates under the force of the water flowing in the spillway, falls and the second support column falls. Since the first support column is stored in the support column insertion hole, and the first support column falls one after another in conjunction with the second support column and is stored in the first support column insertion hole, there is no need to remove the support support. Therefore, according to the first invention, it is possible to reduce the time and cost conventionally required for removing the support.

In addition, the length of the first support and the second support to be stored in the first support and the second support through holes due to the fall described above is determined by the length of the first support and the second support in the first guide and the second guide. determined by the depth of Therefore, according to the first invention, by setting the first guide part and the second guide part to appropriate depths, the first support pillar and the second support pillar can be inserted into the first support insertion hole and the second support pillar. The length stored in the second pillar insertion hole can be made sufficient to prevent the first pillar and the second pillar from being damaged or deformed when submerged in water.

According to the second invention, since the rotation of the second support is reliably transmitted to the first support, when the water level in the waterway rises due to heavy rain etc., the submerged blade member moves inside the waterway. The first and second columns are retracted into the first and second column insertion holes, respectively, by rotating under the force of flowing water, so removing the columns requires less work. The effect of the first invention, which is the reduction in time and cost, is more reliably achieved.

In the third invention, the first locking part and the second locking part are stored in the first widening part and the second widening part, respectively, and a person or a car can move into the first locking part or the second widening part. Since there is no risk of contact with the second locking portion, it is possible to prevent a situation where the first support pillar or the second support pillar is erroneously rotated. In this way, the third invention, in addition to the effects of the first invention or the second invention, prevents the first support or the second support from accidentally falling and causing the first support insertion hole or the second support to fall. It is not stored in the column insertion hole, and has the effect of being excellent in safety.

According to the fourth invention, in addition to the effect of the third invention, the first column insertion hole, the first widened portion, and the first guide portion are difficult to deform, so that the device can be used safely for a long period of time. This has the effect of reducing maintenance costs.

According to the fifth invention, in addition to the effects of the third invention or the fourth invention, the second support insertion hole, the second widened part, and the second guide part are difficult to deform, so that it can be used for a long period of time. It can be used safely and has the effect of reducing maintenance costs.

According to the sixth invention, since the rotation of the second storage device is reliably transmitted to the first storage device, when the water level in the spillway rises due to heavy rain etc., the submerged rotor blades are transferred to the spillway. The first and second columns are stored in the first storage device and the second storage device, respectively, as they rotate under the force of the water flowing inside, so the removal work of the columns requires less work. The effect of the first invention, which is that the time and costs that would otherwise have been incurred are reduced, is more reliably exerted.

According to the seventh invention, the connecting body is connected to the second cylindrical body with respect to the first support main body or the second support main body that descends as the first support support or the second support support falls. Therefore, in addition to the effects of any of the first to sixth inventions, by increasing the number of connecting bodies connecting the first support and the second support, it is possible to prevent people and vehicles from becoming obstacles. This has the effect of further enhancing the function of preventing people from falling.

(a) and (b) are perspective views respectively showing the appearance of a first support and a second support that constitute Example 1 of the fall prevention fence according to the embodiment of the present invention, and (c) is a It is a figure showing the place where a 1st pillar and a 2nd pillar are installed. (a) is an enlarged view of part A in FIG. 1(b), (b) is a view of the first column insertion hole and the first guide groove viewed from above, and (c) is a FIG. 3 is a perspective view schematically showing an enlarged upper part of the column insertion hole and the first guide groove. (a) and (b) are a cross-sectional view taken along the line BB and a cross-sectional view taken along the line CC in FIG. 2(a), respectively. (a) and (b) are diagrams showing the state in which the first support pillar is installed in FIG. 2 (c) and FIG. It is a figure showing the state where the pillar was installed. (a) and (b) are views of the first support column viewed from above in FIG. 4(a), and (c) and (d) are views of the second support column viewed from above in FIG. 1(b). This is a diagram. (a) is a view of the first support as seen from the side opposite to the river in Figure 1(c), and (b) is a view of the first support and wire as seen from above in Figure 1(a). (c) is a view from above of the third support and the wire installed in place of the first support in FIG. 1(b). (a) thru|or (c) are figures which showed the external appearance of a 1st support|pillar and a 2nd support|pillar. (a) and (c) are perspective views showing the appearance of a first cylindrical tube and a first wall plate, and a second cylindrical tube and a second wall plate, respectively, and (b) and (d) are It is a figure which shows the state in which the 1st cylindrical pipe and the 1st wall plate, and the 2nd cylindrical pipe and the 2nd wall plate were each installed in Fig.3 (a) and FIG.3(b). (a) and (d) are views showing the appearance of Example 2 of the fall prevention fence according to the embodiment of the present invention, and (b) is a plan view of the fixture in the same figure (a), (c) is a cross-sectional view taken along the line MM in FIG. 3(b). (a) is a sectional view showing a state where Example 3 of the fall prevention fence according to the embodiment of the present invention is installed, and (b) is a sectional view showing a toothed belt wound around the first gear and the second gear. FIG. 3 is a plan view showing a rotated state. (a) and (b) are perspective views showing the appearance of the upper block and lower block, respectively, (c) is a plan view showing the state in which the upper block is removed in Fig. 10 (a), and (d) and (e) are plan views of the upper block and the lower block, respectively. (a) is a perspective view showing a state in which the first support is loosely inserted into the first gear, and (b) and (c) are views showing the appearance of the first gear and the first gear holder, respectively. (d) is a perspective view showing a state in which the first gear is attached to the first gear holder, and (e) is a perspective view taken along line NN in FIG. FIG. (a) is a perspective view showing a state in which the second support post is loosely inserted into the first gear, and (b) and (c) are views showing the appearance of the second gear and the second gear holder, respectively. (d) is a perspective view showing a state in which the second gear is attached to the second gear holder, and (e) is a perspective view taken along the line PP in FIG. FIG. (a) and (c) are perspective views showing the external appearance of a first storage device to which a third gear is attached, and a second storage device to which a third gear and rotor are attached, respectively; ) and (d) are cross-sectional views of the first storage device insertion hole and the second storage device insertion hole, respectively. (a) is a plan view of the first storage device or the second storage device viewed from the open end side, and (b) and (c) are longitudinal cross sections of the first storage device and the second storage device, respectively. It is a diagram. (a) is a perspective view showing the appearance of the third support column, and (b) and (c) are perspective views showing the appearance of the third gear and the third gear holder, respectively. It is a sectional view showing the state where Example 4 of the fall prevention fence concerning an embodiment of the present invention was installed. (a) is a diagram showing an example of a place where a fall prevention fence is installed, and (b) is a diagram showing a state in which the fall prevention fence is viewed from the river side in the same figure (a).

The fall prevention fence of the present invention is installed on a river or sea embankment to prevent people or cars from falling. Hereinafter, the specific structure and the functions and effects exhibited thereby will be explained in detail with reference to FIGS. 1 to 17. Note that terms and the like that have already been explained using FIG. 18 are given the same reference numerals, and their explanation will be omitted as appropriate. Further, since the first support and the second support are used while being loosely inserted into the first support and second support through holes, respectively, which are formed parallel to the vertical direction. In this specification, expressions such as upper, lower, upper end, lower end, etc. are used assuming such a state.

1(a) and 1(b) show the appearance of the first support 5 and the second support 6 that constitute the fall prevention fence 1a of the present invention, and FIG. 1(c) shows the appearance of the fall prevention fence 1a of the present invention. The figure shows an example of a location where the FIG. 1(c) is a diagram corresponding to FIG. 10(a), and the small circles arranged in a row along the river represent the first support 5 and the second support 6 that constitute the fall prevention fence 1. ing. In addition, in FIG. 1(c), among the plurality of first pillars 5 and second pillars 6, one typical one is given a reference number, and the other pillars are given different numbers. Description is omitted.

The fall prevention fence 1a includes a first support 5 and a second support 6 as shown in FIGS. 1(a) and 1(b), and the wire 52 already explained using FIG. 18(b). There is. The first support 5 and the second support 6 have a support main body 2 in the shape of a long column, and a pair of fixtures 4, 4 are attached to the center axis of the support main body 2 on the top of the side surface 2a of the support main body 2. They are installed symmetrically with the two sides in between.
The first support 5 and the second support 6 have a first locking part 3a and a second locking part 3b, each having a substantially rectangular flat plate shape, located approximately in the longitudinal center of the support main body 2 and aligned with the central axis. They are provided so as to protrude in orthogonal directions. Note that the first locking portion 3a is inclined such that a lower edge 3c forms an acute angle with respect to the side surface 2a of the column main body 2.
The second support 6 has a blade member 11 made of a rectangular flat plate material in a plan view, and has a long side parallel to the radial direction of a circle formed by the edge of the support main body 2, and a short blade member 11 in a plan view. It is installed on the lower end surface 2b of the support main body 2 so that the end surface 11a (the end surface on the tip side of the blade member 11) forming the side protrudes outward from the edge and the flat surface is parallel to the vertical direction. There is.
In addition, as shown in FIG.1(c), the 2nd support column 6 is installed in the upper part of a waterway.

FIG. 2(a) is an enlarged view of section A in FIG. 1(b). However, the circles indicated by solid lines in FIG. 2(a) represent the first support insertion hole 7 and the second support support insertion hole 8 in which the first support support 5 and the second support support 6 are installed, respectively. There is. Moreover, FIG. 2(b) is a view of the first column insertion hole 7 and the first guide groove 9 seen from above, and FIG. 2(c) is a diagram of the first column insertion hole 7 and the first guide hole. FIG. 9 is a perspective view schematically showing an enlarged upper part of FIG. Further, FIGS. 3(a) and 3(b) are a sectional view taken along the line BB and a sectional view taken along the line CC in FIG. 2(a), respectively.
Note that the shapes of the second column insertion hole 8 and the second guide groove 10 when viewed from above and the shapes of their upper portions are the same as those of the first column insertion hole 7 and the first guide hole 9; 2(b) and 2(c), the symbols of the second column insertion hole 8 and the second guide groove 10 are shown in parentheses, along with the first column insertion hole 7 and the first guide hole 9. It is also listed.

As shown in FIG. 2(a), the inner diameters of the first column insertion hole 7 and the second column insertion hole 8, which form a circle in plan view, are the same as those of the column body 2 of the first column 5 and the second column 6, respectively. larger than the outer diameter of That is, the first column insertion hole 7 has a size that allows the first column 5 to be loosely inserted therein, and the second column insertion hole 8 has a size that allows the second column 6 to be loosely inserted therein. It has size. Further, the first column insertion hole 7 and the second column insertion hole 8 are formed from the ground surface to a predetermined depth in parallel to the vertical direction.

As shown in FIGS. 2(b) and 2(c), the first guide groove 9 protrudes outward from the inner circumferential surface 7a of the first column insertion hole 7 in parallel with the radial direction of the circle, and It is formed parallel to the vertical direction. Further, the length of the first guide groove 9 along the vertical direction is longer than the length of the first locking portion 3a along the central axis direction of the strut body 2, and its minimum width (first The minimum length of the insertion hole 7 along the circumferential direction) is wider than the maximum width of the first locking portion 3a (the maximum length of the column main body 2 along the circumferential direction).
Further, a slit is provided in the inner peripheral surface 7a from the upper end 7b to a predetermined depth along the longitudinal direction of the first pillar insertion hole 7 so that the first pillar insertion hole 7 and the first guide groove 9 communicate with each other. The width of 7c (the length along the circumferential direction of the first column insertion hole 7) is wider than the maximum width of the first locking portion 3a described above.
That is, the first guide groove 9 has a structure in which the first locking part 3a can be placed inside with the support main body 2 of the first support 5 being loosely inserted into the first support insertion hole 7. It has a function of guiding the first support 5 in the vertical direction while restricting rotation of the first locking part 3a about the central axis of the support main body 2.

The second guide groove 10 projects outward from the inner circumferential surface 8a of the second column insertion hole 8 in parallel to the radial direction of the circle and parallel to the longitudinal direction of the second column insertion hole 8. It is formed. Further, the length of the second guide groove 10 along the vertical direction is longer than the length of the second locking portion 3b along the central axis direction of the strut body 2, and its minimum width (second The minimum length of the insertion hole 8 along the circumferential direction) is wider than the maximum width of the second locking portion 3b (the maximum length of the column main body 2 along the circumferential direction).
Further, a slit is provided in the inner circumferential surface 8a from the upper end 8b to a predetermined depth along the longitudinal direction of the second pillar insertion hole 8 so that the second pillar insertion hole 8 and the second guide groove 10 communicate with each other. The width of 8c is wider than the maximum width of the second locking portion 3b described above.
That is, the second guide groove 10 has a structure in which the second locking portion 3b can be placed inside with the support main body 2 of the second support 6 being loosely inserted into the second support insertion hole 8. It has a function of guiding the second support 6 in the vertical direction while restricting rotation of the second locking portion 3b about the central axis of the support main body 2.

The first guide groove 9 consists of a first widened part 9a formed to a predetermined depth in the vertical direction from the ground surface, and a first guide part 9b provided below the first widened part 9a. . Note that a first opening 9d is provided in the bottom surface 9c of the first widened portion 9a, and the first guide portion 9b communicates with the first widened portion 9a through this first opening 9d. There is.
The length of the first widened portion 9a along the vertical direction is longer than the length of the first locking portion 3a described above, and the minimum width of the first widened portion 9a (circle of the first column insertion hole 7) is longer than the length of the first locking portion 3a described above. The minimum length along the circumferential direction) is the maximum width of the first guide portion 9b (the maximum length along the circumferential direction of the first column insertion hole 7) as described above. It is wider than the sum of the maximum width of the stop portion 3a.
That is, the first widened portion 9a has a structure in which the first locking portion 3a can be placed inside with the support main body 2 of the first support 5 being loosely inserted into the first support insertion hole 7. The rotation of the first locking part 3a about the central axis of the column main body 2 is restricted by the first guide part 9b, whereas this rotation is restricted in the first widened part 9a. It is allowed within a predetermined rotation angle range.

The second guide groove 10 consists of a second widened part 10a formed to a predetermined depth in the vertical direction from the ground surface, and a second guide part 10b provided below the second widened part 10a. . Note that a second opening 10d is provided in the bottom surface 10c of the second widened portion 10a, and the second guide portion 10b communicates with the second widened portion 10a through this second opening 10d. There is.
The length in the vertical direction of the second widened part 10a is longer than the length of the second locking part 3b, and the minimum width of the second widened part 10a (in the circumferential direction of the second column insertion hole 8) is longer than the length of the second locking part 3b. ) is the maximum width of the second guide portion 10b (the maximum length along the circumferential direction of the second column insertion hole 8) as described above for the second locking portion. Wider than the maximum width of 3b.
That is, the second widened part 10a has a structure in which the second locking part 3b can be placed inside with the support main body 2 of the second support 6 being loosely inserted into the second support insertion hole 8. The second guide portion 10b restricts the rotation of the second locking portion 3b about the central axis of the column main body 2, whereas this rotation is restricted in the second widened portion 10a. It is allowed within a predetermined rotation angle range.

As shown in FIG. 3(a), the first column insertion hole 7 has a bottom surface, whereas the second column insertion hole 8 does not have a bottom surface and is open at the lower end 8d. As shown in FIG. 3(b), the second column insertion hole 8 is formed above the waterway 56 so that the lower end 8d communicates with the waterway 56. Note that unless the water level of the river rises due to heavy rain or the like, the water surface 55 is at a position lower than the ceiling surface 56a of the waterway 56.

4(a) and 4(b) show a state in which the first column 5 is installed in the first column insertion hole 7 in FIGS. 2(c) and 3(a), respectively, and FIG. (c) shows a state in which the second column 6 is installed in the second column insertion hole 8 in FIG. 3(b).
Note that the state in which the second support column 6 is installed in the second support support insertion hole 8 is similar to that shown in FIG. This is almost the same as the state in which the first column 5 is installed in the first column insertion hole 7 shown in (a). In addition, in FIGS. 4(b) and 4(c), in order to easily distinguish between the first column insertion hole 7 and the second column insertion hole 8, the first column 5 and the second column 6 are The appearance is shown. Furthermore, in FIG. 4(a), only a part of the first support column 5 is shown, and in FIG. 4(b) and FIG. 4(c), illustration of the fixture 4 is omitted.

5(a) and 5(b) show the first support column 5 seen from above in FIG. 4(a), and FIG. 5(c) and FIG. 5(d) show the state shown in FIG. 1(b). ) shows the second support column 6 viewed from above. In addition, in FIGS. 5(a) and 5(b), the first support column 5 is hatched in order to easily distinguish it from the first support insertion hole 7 and the first guide groove 9. There is. Furthermore, since the state of the second support 6 installed in the second support support insertion hole 8 viewed from above is the same as the state of the first support support 5 installed in the first support support insertion hole 7, In FIGS. 5(a) and 5(b), the numbers of the second column insertion hole 8 and the second guide groove 10 are in parentheses, and the first column insertion hole 7 and the first guide hole 9 are shown in parentheses. It is also listed with. Furthermore, FIG. 5(d) corresponds to a state in which the locking portion 3b is disposed above the guide portion 10b in FIG. 5(b).

As shown in FIGS. 4(a) and 5(a), the lower end of the first locking portion 3a is in a state where the support main body 2 of the first support 5 is loosely inserted into the first support insertion hole 7. is locked to the bottom surface 9c of the first widened portion 9a of the first guide groove 9, the first support column 5 is prevented from moving downward by the first widened portion 9a, so as shown in FIG. 4(b), the portion above the first locking portion 3a is exposed above the ground 53. At this time, the first support 5 can rotate about the central axis of the support main body 2 within the range in which the first locking part 3a can move inside the first widened part 9a. .

That is, the first widened portion 9a stores the first locking portion 3a therein, and allows rotation of the support main body 2 about the central axis within a predetermined rotation angle. It has the function of holding the first support column 5.
In this way, if the first locking part 3a is stored in the first widening part 9a, there is no risk that a person or a car will come into contact with the first locking part. It is possible to prevent the situation where the Therefore, the fall prevention fence 1a prevents the first support 5 from accidentally falling and being stored in the first support insertion hole 7, and is excellent in safety.

The first support 5 rotates about the central axis of the support main body 2 as shown by the arrow in FIG. When the vertical direction coincides with the opening 9d, the locked state between the bottom surface 9c of the first widened portion 9a and the first locking portion 3a is released, so that the first support 5 does not fall due to its own weight. do.

As shown in FIG. 5(a), when the support main body 2 of the second support 6 is loosely inserted into the second support insertion hole 8, the lower end of the second locking part 3b is inserted into the second guide groove. 10, the second support column 6 is prevented from moving downward by the second widened portion 10a, as shown in FIG. 4(c). As such, the portion above the second locking portion 3b is exposed above the ground 53. At this time, the second support 6 can rotate about the central axis of the support main body 2 within the range in which the second locking part 3b can move inside the second widened part 10a. .

That is, the second widened part 10a stores the second locking part 3b inside, and allows rotation about the central axis of the column main body 2 within a predetermined rotation angle range. It has the function of holding the second support column 6.
In this way, if the second locking part 3b is stored in the second widened part 10a, there is no risk that people or cars will come into contact with the second locking part 3b, so they cannot accidentally touch the second support column. It is possible to prevent a situation in which 6 is rotated. Therefore, the fall prevention fence 1a prevents the second support 6 from accidentally falling and being stored in the second support support insertion hole 8, and is excellent in safety.

The second support 6 rotates about the central axis of the support main body 2 as shown by the arrow in FIG. When the vertical direction coincides with the opening 10d, the locked state between the bottom surface 10c of the second widened portion 10a and the second locking portion 3b is released, so that the second support 6 does not fall due to its own weight. do.

As shown in FIG. 4(c), the second support 6 has a blade installed on the lower end surface 2b of the support main body 2 in a state in which the second locking portion 3b is locked to the second widened portion 10a. The member 11 is arranged near the ceiling surface 56a of the waterway 56, and the structure is such that the blade member 11 is not submerged in water normally.
However, when the water level of the river rises due to heavy rain or the like and the water surface 55 reaches the ceiling surface 56a of the waterway 56, the blade member 11 becomes submerged. As already mentioned, when the second locking portion 3b is locked to the second widened portion 10a, the second support 6 is connected to the second locking portion inside the second widened portion 10a. Rotation about the central axis of the support column body 2 is possible within the range in which the support column 3b can move. Therefore, the second support 6 receives a force as shown by arrow D in FIG. 5(c) on the blade member 11 due to the water flowing inside the discharge channel 56, and the second support 6 receives a force as shown by arrow E in FIG. It rotates around the central axis of the support main body 2. When the state shown in FIG. 5(d) is reached, the second locking portion 3b is aligned with the second opening 10d in the vertical direction, as already explained using FIG. 5(b). As a result, the locked state between the bottom surface 10c of the second widened portion 10a and the second locking portion 3b is released, so that the second support column 6 falls due to its own weight.

FIG. 6(a) shows the first support 5 in FIG. 1(c) when viewed from the opposite side of the river, and FIG. 6(b) shows the first support 5 in FIG. 5(a). The wire 52 is shown viewed from above. Moreover, FIG. 5(c) shows a state in which a third pillar 12 according to a modification thereof is used instead of the first pillar 5 in FIG. 5(b).
Note that the state of the second support 6 seen from the river side in FIG. 1(c) is also the same as the state of the first support 5 shown in FIG. 6(a), so in FIG. The reference numeral of the column 6 is shown in parentheses together with the first column 5.

As shown in FIGS. 6(a) and 6(b), the first support 5 has its own support main body 2 in a state where the first locking portion 3a is locked to the first widened portion 9a. The wire 52 connecting the two pillar bodies 2 is not parallel to the vertical plane including the central axis and the central axis of the pillar body 2 of the adjacent other first pillar 5 or second pillar 6. A wire 52 is attached to the fixture 4. Therefore, when the wire 52 is pulled as shown by the arrow F in FIG. 6(b), the first support 5 rotates around the central axis of the support main body 2 as shown by the arrow G in FIG. 6(b). move.

In the first support column 5, the first locking part 3a is provided so as to protrude in a direction perpendicular to a vertical plane including a line connecting the widthwise centers of the pair of fixtures 4, 4. The third support 12, which is provided with the first locking part 3a so as to protrude in a direction parallel to the vertical plane including the line connecting the widthwise centers of the fixing devices 4, 4, is attached to the first support 5. Can be used instead. In this case, by attaching the wire 52 to the fixture 4 of the third support 12 as shown in FIG. When it is locked in the widened part 9a of , the wires 52 connecting the two support main bodies 2 are not parallel. Therefore, when the wire 52 is pulled as shown by the arrow H in FIG. 6(c), the third support 12 rotates around the central axis of the support main body 2 as shown by the arrow I in FIG. 6(c). move.

7(a) to 7(c) show the fall prevention fence 1a viewed from the side opposite to the river in FIG. 1(c).
As already explained using FIG. 5(c), when the water level of the river rises due to heavy rain etc., the water surface 55 reaches the ceiling surface 56a of the spillway 56, and the blade member 11 is submerged, the water flowing through the spillway 56 The second support column 6 rotates due to the force that the blade member 11 receives from the blade member 11 . When the state shown in FIG. 5(d) is reached, the second pillar 6 shown in FIG. 7(a) falls due to its own weight, and the second pillar insertion hole 8 is inserted as shown in FIG. (See FIG. 3(b)), in which most of the column body 2 is retracted. Note that the length of the second column 6 stored in the second column insertion hole 8 when the column main body 2 falls due to its own weight is determined by the depth of the second guide portion 10b. Therefore, in the fall prevention fence 1a, by setting the second guide portion 10b to an appropriate depth, the length of the portion where the second support 6 is stored in the second support insertion hole 8 can be adjusted to the length at the time of submergence. It may be sufficient to prevent damage or deformation.

As shown in FIG. 7(a), the length _L2 of the wire 52 connecting the first pillar 5 at the center and the second pillar 6 at the right end is the distance between the first pillar 5 and the second pillar 6. Almost equal. On the other hand, if the length of the wire 52 connecting the second support 6 and the first support 5 in the fallen state is _L1 , one of the two sides sandwiching the right angle as shown in FIG. 7(b) Since L _{1 is approximately equal to the length of the hypotenuse of the right-angled isosceles triangle whose length is represented by L 2 ,} L ₁ >L ₂ .

When the second support 6 falls from the state shown in FIG. 7(a) and becomes the state shown in FIG. 7(b), the wire 52 connecting the first support 5 and the second support 6 is 7(b), it will be pulled in the direction shown by arrow J. This horizontal component of the force indicated by the arrow J acts on the wire 52 as a force indicated by the arrow F in FIG. 6(b), which has already been described. As a result, the first support 5 rotates about the central axis of the support main body 2 as shown by arrow G in FIG. 6(b). When the first locking portion 3a is vertically aligned with the first opening 9d as shown in FIG. 5(b), the first support 5 shown in FIG. 7(b) is , it falls due to its own weight, and as shown in FIG. 7(c), most of the column main body 2 is stored in the first column insertion hole 7 (see FIG. 3(a)). The length by which the first support 5 is stored in the first support insertion hole 7 when the support main body 2 falls due to its own weight is determined by the depth of the first guide portion 9b. Therefore, in the fall prevention fence 1a, by setting the first guide portion 9b to an appropriate depth, the length of the portion of the first support 5 stored in the first support insertion hole 7 can be adjusted to the length at the time of submergence. It may be sufficient to prevent damage or deformation.

When the first support 5 falls from the state shown in FIG. 7(b) and becomes the state shown in FIG. 7(c), the leftmost first support 5 will be It is pulled in the direction shown by the arrow K in FIG. 7(c) by a wire 52 whose one end is connected to the first pillar 5 in the center. As a result, the first column 5 at the left end rotates in the same manner as the first column 5 at the center, and the first locking part 3a engages with the first guide part 9b as shown in FIG. When they reach a state of alignment in the vertical direction, they fall due to their own weight.
Furthermore, the next first column 5 (not shown) connected to the first column 5 at the left end via a wire 52 rotates by being pulled by the wire 52, as shown in FIG. 5(b). As described above, when the first locking portion 3a is vertically aligned with the first guide portion 9b, it falls due to its own weight in the same manner as the first support 5 at the left end.

As described above, in the fall prevention fence 1a of the present invention, when the water level of the river rises due to heavy rain or the like and the blade member 11 is submerged, the second support column 6 rotates under the force of the water flowing through the waterway 56. falls due to its own weight, and as the second support 6 falls, the first support 5 connected via the wire 52 rotates one after another and falls due to its own weight. In this case, the first strut 5 and the second strut 6 are submerged in water because most of the strut body 2 is stored inside the first strut insertion hole 7 and the second strut insertion hole 8. Even if the first support 5 and the second support 6 are subjected to force from earth and sand or water flow, the first support 5 and the second support 6 are unlikely to be damaged or deformed. Therefore, with the fall prevention fence 1a, there is no need to remove the first support 5 and the second support 6 every time heavy rain etc. occurs, reducing the time and cost required for removal work that was conventionally necessary. Ru.

Next, a modification of the fall prevention fence 1a will be described using FIG. 8. FIG. 8(a) is a perspective view showing the appearance of the first cylindrical tube 13 and the first wall plate 14, and FIG. 8(b) is a perspective view showing the appearance of the first cylindrical tube 13 and the first wall plate 14. FIG. 8(c) is a sectional view showing the state in which the second cylindrical tube 15 and the second wall plate 16 are installed in the first column insertion hole 7 and the first guide groove 9, respectively. It is a perspective view, and FIG. 8(d) is a sectional view showing a state in which the second cylindrical tube 15 and the second wall plate 16 are respectively installed in the second column insertion hole 8 and the second guide groove 10. be. Note that FIGS. 8(b) and 8(d) correspond to FIGS. 3(a) and 3(b), respectively.

As shown in FIGS. 8(a) and 8(b), the fall prevention fence 1a has a first cylindrical tube 13 installed inside the first column insertion hole 7, and a first guide groove 9. A first wall plate 14 is installed to cover the inner surface of the wall plate 14, communicates with the first guide groove 9, and has a width that allows the first locking part 3a of the first support column 5 to be placed inside. The structure may be such that the first slit 13a is provided on the inner circumferential surface 13b of the first cylindrical tube 13.

However, the first cylindrical tube 13 has an inner diameter larger than the outer diameter of the strut body 2 of the first strut 5 and a smaller outer diameter than the inner diameter of the first strut insertion hole 7. The second space surrounded by the first wall plate 14 in the guide portion 9b has a minimum width (minimum length along the circumferential direction of the first column insertion hole 7) that is equal to the first space. It shall be wider than the maximum width of the locking portion 3a (the maximum length of the support main body 2 along the circumferential direction). Furthermore, the first space surrounded by the first wall plate 14 in the first widening part 9a has a vertical length that is along the central axis direction of the support main body 2 of the first locking part 3a. The length is longer than the length of the first guide portion 9b, and its minimum width (the minimum length along the circumferential direction of the first column insertion hole 7) is the maximum width of the first guide portion 9b (the circle of the first column insertion hole 7). The maximum width of the first locking portion 3a described above is added to the maximum length of the first locking portion 3a in the circumferential direction.

That is, the first column insertion hole 7 has a size that allows the column main body 2 of the first column 5 to be loosely inserted even when the first cylindrical tube 13 is installed inside the first column insertion hole 7. Even when the first wall plate 14 is installed so as to cover the inner surface of the guide groove 9, the first widened portion 9a does not fit the support of the first support 5 into the first support insertion hole 7. It has a size that allows the first locking portion 3a to be placed inside when the main body 2 is loosely inserted. Therefore, while the first guide part 9b restricts the rotation of the first locking part 3a about the central axis of the column main body 2, the first widened part 9a restricts the rotation of the first locking part 3a. The effect of allowing the aforementioned rotation within a predetermined rotation angle range is achieved in the same manner as in the case where the first wall plate 14 is not installed in the first guide groove 9.

In the fall prevention fence 1a having the above structure, the first cylindrical tube 13 and the first wall plate 14 prevent the first column insertion hole 7 and the first guide groove 9 from deforming, respectively, and maintain their shapes. Because of this, it can be used safely for a long period of time. This reduces maintenance costs.

As shown in FIG. 8(c) and FIG. 8(d), in the fall prevention fence 1a, a second cylindrical tube 15 is installed inside the second column insertion hole 8, and a second guide groove 10 A second wall plate 16 is installed to cover the inner surface of the second wall plate 16, communicates with the second guide groove 10, and has a width that allows the second locking part 3b of the second support column 6 to be placed inside. It is also possible to adopt a structure in which the second slit 15a is provided on the inner peripheral surface 15b of the second cylindrical tube 15.

However, the second cylindrical tube 15 has an inner diameter larger than the outer diameter of the strut main body 2 of the second strut 6 and an outer diameter smaller than the inner diameter of the second strut insertion hole 8. The fourth space surrounded by the second wall plate 16 in the guide portion 10b has a minimum width (minimum length along the circumferential direction of the second column insertion hole 8) that is equal to the second space. It shall be wider than the maximum width of the locking portion 3b (the maximum length of the support main body 2 along the circumferential direction). Furthermore, a third space surrounded by the second wall plate 16 in the second widened part 10a has a vertical length that is parallel to the central axis direction of the support main body 2 of the second locking part 3b. The length of the second guide portion 10b is longer than the length of the second guide portion 10b, and its minimum width (the minimum length along the circumferential direction of the second column insertion hole 8) is the maximum width of the second guide portion 10b (the circle of the second column insertion hole 8). The maximum width of the second locking portion 3b described above is added to the maximum length of the second locking portion 3b along the circumferential direction.

That is, the second column insertion hole 8 has a size that allows the column main body 2 of the second column 6 to be loosely inserted even when the second cylindrical tube 15 is installed inside. Even when the second wall plate 16 is installed to cover the inner surface of the guide groove 10 of It has a size that allows the second locking portion 3b to be placed inside when the main body 2 is loosely inserted. Therefore, while the second guide part 10b restricts the rotation of the second locking part 3b about the central axis of the column main body 2, the second widened part 10a restricts the rotation of the second locking part 3b. The effect of allowing the aforementioned rotation within a predetermined rotation angle range is achieved in the same manner as in the case where the second wall plate 16 is not installed in the second guide groove 10.

In the fall prevention fence 1a having the above structure, the second cylindrical tube 15 and the second wall plate 16 prevent deformation of the second column insertion hole 8 and the second guide groove 10, respectively, and maintain their shapes. Because of this, it can be used safely for a long period of time. This reduces maintenance costs.

9(a) and 9(d) show a state in which a fall prevention fence 1b is installed instead of the fall prevention fence 1a in FIG. 7(a). Further, FIG. 9(b) is a plan view of the fixture in FIG. 9(a), and FIG. 9(c) is a sectional view taken along the line MM in FIG. 9(b). Note that FIGS. 9(a) and 9(d) correspond to FIGS. 7(a) and 7(c), respectively, showing the fall prevention fence 1a.
As shown in FIG. 9(a), the fall prevention fence 1b has a structure in which the fixtures 4 are attached to the support main body 2 via the fixtures 17 in the fall prevention fence 1a.

As shown in FIGS. 9(b) and 9(c), the fixture 17 is attached to a first cylindrical body 18 and a second cylindrical body 19 that are fitted onto the strut body 2, and the outer diameter of the strut body 2. It is constituted by a cylindrical bellows member 20 that has a larger inner diameter than the cylindrical body 18 and connects the first cylindrical body 18 and the second cylindrical body 19 or the second cylindrical bodies 19 to each other.
A pair of fixtures 4, 4 are respectively attached to the outer circumferential surface 18a of the first cylindrical body 18 and the outer circumferential surface 19a of the second cylindrical body 19 so as to be symmetrical with respect to their central axes. Further, the first cylindrical body 18 is fixed to the column main body 2, and the second cylindrical body 19 is movably installed below the first cylindrical body 18 along the central axis of the column main body 2. There is.

Since the first cylindrical body 18 is fixed to the first column 5 and the column main body 2 of the second column 6, the wire 52 connected to the fixture 4 attached to the first cylindrical body 18 is , functions in the same way as the wire 52 in the fall prevention fence 1a. For example, if the second support 6 shown at the right end of FIG. 9(a) falls due to its own weight, the first support 5 shown at the center of FIG. When the first locking part 3a is pulled by the wire 52 connected to the first guide part 9b and the first locking part 3a is vertically aligned with the first guide part 9b, the first locking part 3a falls due to its own weight.
At this time, the bellows member 20 shrinks and the second cylindrical body 19 moves along the central axis of the column main body 2 in a direction approaching the first cylindrical body 18, resulting in the state shown in FIG. 9(d).

In the fall prevention fence 1a, the first column 5 and the second column 6 are arranged so that they do not get in the way when the column main body 2 falls through the first column insertion hole 7 and the second column insertion hole 8. They are connected by one wire 52. On the other hand, in the fall prevention fence 1b, the first support 5 and the second support 6 are connected by three wires 52, so that it is more effective in preventing falls of people and cars than the fall prevention fence 1a. expensive.

Further, in the fall prevention fence 1b, when the support main body 2 falls through the first support insertion hole 7 or the second support support insertion hole 8, the bellows member 20 contracts and the second cylindrical body 19 moves into the first support support insertion hole 7. The wire 52 , which is connected to the second cylindrical body 19 via the fixture 4 , also moves together with the second cylindrical body 19 . Therefore, in the fall prevention fence 1b, the support main body 2 that descends inside the first support insertion hole 7 and the second support support insertion hole 8 as the first support support 5 and the second support support 6 fall, Therefore, the wire 52 connected to the second cylindrical body 19 is less likely to become an obstacle. Therefore, in the fall prevention fence 1b, it is possible to increase the number of wires 52 connecting the first support 5 and the second support 6 compared to the fall prevention fence 1a, thereby preventing people and cars from falling. The function of preventing this is further demonstrated.

FIG. 10(a) shows a state in which the fall prevention fence 1c of the present invention is installed, and FIG. 10(b) shows a state in which a toothed belt 25 is wound around the first gear 21 and the second gear 23. Indicates the condition. 11(a) and 11(b) show the appearance of the upper block 27 and lower block 28, respectively, and FIG. 11(c) shows the state in which the upper block 27 is removed from FIG. 10(a). ing. 11(d) and FIG. 11(e) are plan views of the upper block 27 and lower block 28, respectively.
In addition, in FIG. 10(a), the toothed belt 25 is shown by a broken line. Furthermore, in order to avoid complication of the drawing, the boundary line between the upper block 27 and the lower block 28 is not shown in FIG. 10(a), and the wire 52 is not shown in FIG. 11(b). .

FIG. 12(a) shows a state in which the first support column 5 is loosely inserted into the first gear 21, and FIGS. The appearance of the gear holder 22 is shown. Moreover, FIG. 12(d) is a perspective view showing the state in which the first gear 21 is attached to the first gear holder 22, and FIG. 12(e) is a perspective view showing the state where the first gear 21 is attached to the first gear holder 22. FIG.
13(a) shows a state in which the second support 6 is loosely inserted into the first gear 21, and FIGS. 13(b) and 13(c) show the second gear 23 and the second gear 21, respectively. The appearance of the gear holder 24 is shown. Moreover, FIG. 13(d) is a perspective view showing the state in which the second gear 23 is attached to the second gear holder 24, and FIG. 13(e) is a perspective view showing the state where the second gear 23 is attached to the second gear holder 24. FIG.
Note that the constituent elements shown in FIGS. 1 to 9 and 18 are given the same reference numerals, and the description thereof will be omitted as appropriate.

As shown in FIGS. 10(a) and 10(b), the fall prevention fences 1c are connected to each other via wires 52, and are inserted into the first column insertion hole 7 and the second column insertion hole 8, respectively. The first support 5 and the second support 6 that are loosely inserted, the first gear 21 and the first gear holder 22, the second gear 23 and the second gear holder 24, and the second support The present invention includes an endless toothed belt 25 wound around a first gear 21 in which the gear 6 is loosely inserted and another first gear 21 in which the first support 5 is loosely inserted. The first gear 21 is provided with a keyhole-shaped through hole consisting of an insertion hole 21a and a guide hole 21b, which form a circle in plan view. Further, the second gear 23 is provided with a shaft hole 23a (see FIG. 13(b)).

The central axis of the insertion hole 21a coincides with the central axis of rotation of the first gear 21, and the central axis of the shaft hole 23a coincides with the central axis of rotation of the second gear 23. Further, the guide hole 21b projects outward from the inner circumferential surface of the insertion hole 21a in parallel to the radial direction of the circle, and is formed parallel to the central axis of the insertion hole 21a.
The inner diameter of the insertion hole 21a is larger than the outer diameter of the first support 5 and the second support 6, and the minimum width of the guide hole 21b (the minimum length of the insertion hole 21a along the circumferential direction) is It is wider than the maximum width of the first locking portion 3a and the second locking portion 3b (the maximum length along the circumferential direction of the column main body 2). That is, the insertion hole 21a and the guide hole 21b simultaneously allow the strut body 2 and the first locking portion 3a of the first strut 5, or the strut body 2 and the second locking portion 3b of the second strut 6 to play freely. The first support 5 and the second support 6 are rotatably held by a first gear 21.

The second gear 23 is a toothed belt 25 stretched between the first gear 21 into which the first support 5 is loosely inserted and the first gear 21 into which the second support 6 is loosely inserted. By keeping the distance between the two parallel parts constant, it has a function of preventing the toothed belt 25 from rotating idle relative to the first gear 21. Therefore, if the interval between the two first gears 21 is narrow and the toothed belt 25 is unlikely to idle, the second gear 23 can be omitted.

A plurality of second gears 23 are installed between the two first gears 21 with toothed belts 25 meshing with each other, and the first gears 21 and the second gears 23 are arranged in a vertical direction. The central axes of rotation, which are parallel to each other, are arranged so that they form the same plane.
Further, above the first column insertion hole 7 and the second column insertion hole 8, a hole is provided so as to connect between the two first columns 5 or between the first column 5 and the second column 6. A cylindrical hollow part 26 is formed by an upper block 27 and a lower block 28, and in this hollow part 26, a first gear 21 and a first gear holder 22, a second gear 23 and a second gear holder are placed. A gear holder 24 and a toothed belt 25 are installed.

As shown in FIGS. 11(a) and 11(b), the upper block 27 has a pair of side walls 27b, 27b erected on both sides of the upper wall 27a so as to form a substantially inverted U-shape when viewed from the side. The lower block 28 has a structure in which a pair of side walls 28b, 28b are erected on both sides of a lower wall 28a so as to form a substantially U-shape when viewed from the side.
As shown in FIG. 11(c), the first gear 21 and the second gear 23 are installed using bolts (not shown) or the like on the lower wall portions 28a of the plurality of lower blocks 28 spread out without any gaps. A first gear holder 22 and a second gear holder 24 having a rotation shaft 24b (see FIG. 13(c)) are respectively held.

As shown in FIG. 11(d), the upper block 27 installed above the first column insertion hole 7 and the second column insertion hole 8 has the columns of the first column 5 and the second column 6. An insertion hole 27c into which the main body 2 can be loosely inserted is formed in the upper wall portion 27a. As shown in FIG. 11(e), the lower block 28 installed under the upper block 27 having the insertion hole 27c has an insertion hole 28c that is circular in plan view and whose central axis is perpendicular to the lower wall 28a. A guide hole 28d is provided. The guide hole 28d projects outward from the inner peripheral surface of the insertion hole 28c in parallel with the radial direction of the circle, and is formed parallel to the central axis of the insertion hole 28c.
The inner diameter of the insertion hole 28c is larger than the outer diameter of the first support 5 and the second support 6, and the minimum width of the guide hole 28d (the minimum length of the insertion hole 28c along the circumferential direction) is It is wider than the maximum width of the first locking portion 3a and the second locking portion 3b (the maximum length along the circumferential direction of the column main body 2). That is, the insertion hole 28c and the guide hole 28d simultaneously allow the strut body 2 and the first locking portion 3a of the first strut 5, or the strut body 2 and the second locking portion 3b of the second strut 6 to play freely. It is large enough to be inserted.
Furthermore, when the lower block 28 is placed above the first column insertion hole 7 or the second column insertion hole 8, the central axis of the insertion hole 28c of the lower block 28 is the same as that of the first column 5 or the second column. It is provided at a position that coincides with the central axis of 6. The insertion hole 27c of the upper block 27 is provided at a position where the center axis coincides with the center axis of the insertion hole 28c when the upper block 27 is installed on the upper part of the lower block 28.

As shown in FIG. 12(a), the support main body 2 and the first locking portion 3a of the first support 5 are loosely inserted into the insertion hole 21a and the guide hole 21b of the first gear 21 at the same time. In this case, the first gear 21 has the function of allowing the first support column 5 to move in the vertical direction while restricting rotation about the central axis of the support body 2 . Therefore, when the first gear 21 rotates in the state shown in FIG. .

As shown in FIG. 12(b), the first gear 21 is provided with a guide portion 21c having a substantially short cylindrical shape on one side. Note that the term "substantially short cylinder" means a state in which a part of a circle is cut out when viewed from above. Moreover, the central axis of the cylinder of the guide part 21c coincides with the central axis of rotation of the first gear 21, and the inner diameter of the guide part 21c is larger than the inner diameter of the insertion hole 21a.
On the other hand, the first gear holder 22 is made of a rectangular flat plate and has a circular shape in plan view, and is provided with an insertion hole 22a and a guide hole 22b whose central axes are perpendicular to each other. The guide hole 22b projects outward from the inner peripheral surface of the insertion hole 22a in parallel to the radial direction of the circle, and is formed parallel to the central axis of the insertion hole 22a.
The inner diameter of the insertion hole 22a is larger than the outer diameter of the first support 5 and the second support 6, and the minimum width of the guide hole 22b (the minimum length of the insertion hole 22a along the circumferential direction) is It is wider than the maximum width of the first locking portion 3a and the second locking portion 3b (the maximum length along the circumferential direction of the column main body 2). That is, the insertion hole 22a and the guide hole 22b simultaneously allow the strut body 2 and the first locking portion 3a of the first strut 5, or the strut body 2 and the second locking portion 3b of the second strut 6 to play freely. It is large enough to be inserted.

Further, a guide groove 22c having an arcuate shape in plan view is formed on one side of the first gear holder 22 so as to surround the insertion hole 22a.
That is, the guide groove 22c has a circular arc shape when viewed from above by partially cutting out a circle by the guide hole 22b.
Note that the guide groove 22c has a width that allows the guide portion 21c of the first gear 21 to be placed therein, and is formed at a position such that the center of the arc is placed on the central axis of the insertion hole 22a. .

Therefore, as shown in FIGS. 12(d) and 12(e), the first gear 21 is placed on one side of the first gear holder 22 so that the guide portion 21c is disposed inside the guide groove 22c. When installed, the insertion hole 21a of the first gear 21 and the insertion hole 22a of the first gear holder 22 are in communication with each other. At this time, the first gear holder 22 allows the first gear 21, in which the guide portion 21c is disposed inside the guide groove 22c, to rotate in a direction perpendicular to the central axis of rotation. It has the effect of regulating the movement of.

As shown in FIG. 13(a), the support main body 2 and the second locking portion 3b of the second support 6 are loosely inserted into the insertion hole 21a and the guide hole 21b of the first gear 21 at the same time. In this case, the first gear 21 has the function of allowing the second support column 6 to move in the vertical direction while restricting rotation about the central axis of the support body 2 . Therefore, when the first gear 21 rotates in the state shown in FIG. .

As shown in FIG. 13(b), the second gear 23 is provided with a short cylindrical guide portion 23b on one side. In addition, in the guide part 23b, the central axis of the cylinder coincides with the central axis of the shaft hole 23a, which is the rotation center of the second gear 23, and the inner diameter of the guide part 23b is larger than the inner diameter of the shaft hole 23a. .
On the other hand, in the second gear holder 24, a cylindrical rotation shaft 24b inserted into the shaft hole 23a of the second gear 23 is erected perpendicularly to a base 24a made of a rectangular flat plate material. It has a structure. Furthermore, a guide groove 24c having a circular shape in plan view is formed on the surface of the second gear holder 24 on which the rotation shaft 24b is provided so as to surround the rotation shaft 24b.
The guide groove 24c has a width that allows the guide portion 23b of the second gear 23 to be placed therein, and is formed at a position such that the center of the circle is located on the central axis of the rotation shaft 24b. ing.

Therefore, as shown in FIGS. 13(d) and 13(e), the second gear 23 is installed on one side of the second gear holder 24 with the rotation shaft 24b inserted into the shaft hole 23a. Then, the guide portion 23b is arranged inside the guide groove 24c. At this time, the second gear holder 24 allows rotation of the second gear 23, in which the rotation shaft 24b is inserted into the shaft hole 23a and the guide portion 23b is disposed inside the guide groove 24c. At the same time, it has the effect of restricting movement in a direction perpendicular to the central axis of rotation.

In the fall prevention fence 1c having the above structure, as already explained using FIGS. 4(a) and 5(a), the post body 2 of the first post 5 is loosely inserted into the first post insertion hole 7. When the lower end of the first locking part 3a is locked to the bottom surface 9c (see FIG. 4(a)) of the first widened part 9a of the first guide groove 9, the first support 5 is prevented from moving downward by the first widened portion 9a, so that the portion above the upper block 27 constituting the hollow portion 26 is exposed above the ground as shown in FIG. 10(a). It has become.
At this time, the first support 5 can rotate about the central axis of the support main body 2 within the range in which the first locking part 3a can move inside the first widened part 9a. .

Further, as shown in FIG. 5(a), when the support main body 2 of the second support 6 is loosely inserted into the second support insertion hole 8, the lower end of the second locking portion 3b is inserted into the second support When locked to the bottom surface 10c (see FIG. 5(a)) of the second widened portion 10a of the guide groove 10, the second support 6 is prevented from moving downward by the second widened portion 10a. Therefore, as shown in FIG. 10(a), a portion of the hollow portion 26 above the upper block 27 is exposed above the ground. At this time, the second support 6 can rotate about the central axis of the support main body 2 within the range in which the second locking part 3b can move inside the second widened part 10a. .

In the state shown in FIG. 10A, when the water level of the river rises due to heavy rain or the like and the water surface 55 reaches the ceiling surface 56a of the waterway 56, the blade member 11 is submerged. When the blade member 11 receives a force as shown by the arrow D in FIG. 5(c) due to the water flowing inside the discharge channel 56, the second support column 6 receives the force shown by the arrow E in FIG. 5(c). It rotates around the central axis of the support main body 2 as shown in FIG. At this time, the second locking portion 3b of the second support 6 is loosely inserted into the through hole 21a of the first gear 21, so the first gear 21 is connected to the second support 6. Rotate as one.
Due to the rotation of the second support 6, as already explained using FIG. When the locked state between the bottom surface 10c of the support 10a and the second locking portion 3b is released, the second support 6 falls due to its own weight.

When the first gear 21 rotates together with the second support 6, all the other gears connected to the first gear 21 via the toothed belt 25 and into which the first support 5 is loosely inserted are connected to the first gear 21 via the toothed belt 25. The gear 21 of No. 1 rotates. At this time, since the first locking part 3a of the first support column 5 is loosely inserted into the through hole 21a of the first gear 21, the first locking part 3a is integrated with the first gear 21. The pillar 5 of No. 1 also rotates.
Due to the rotation of the first support 5, the first locking part 3a aligns with the first opening 9d in the vertical direction, and the first widening part When the locked state between the bottom surface 9c of the support 9a and the first locking portion 3a is released, the first support 5 falls due to its own weight.

In addition, in the fall prevention fence 1c, as the first gear 21 into which the second support 6 is loosely inserted rotates, all the other first gears 21 into which the first support 5 is loosely inserted rotate. As the second column 6 rotates, the second column 6 and all the first columns 5 fall almost simultaneously, so that the first column 5 is pulled by the wire 52 to the falling second column 6, and the first column 5 is pulled by the falling second column 6. There is no need to worry about the first support 5 being prevented from falling, or the next first support 5 being pulled by the falling first support 5 by the wire 52, which will prevent the first support 5 from falling. do not have.

As described above, in the fall prevention fence 1c of the present invention, when the water level of the river rises due to heavy rain or the like and the blade member 11 is submerged, the second support column 6 rotates under the force of the water flowing through the waterway 56. falls due to its own weight, and the first gear 21 into which the second support column 6 is loosely inserted also rotates. Then, the rotation of the first gear 21 is transmitted to all the other first gears 21 into which the first support column 5 is loosely inserted, via the toothed belt 25, and the first gear 21 is loosely inserted into the first gear 21. All the first columns 5 rotated together with the first gear 21, and the first columns 5 fall one after another due to their own weight.
That is, according to the fall prevention fence 1c, the rotation of the second support post 6 is reliably transmitted to the first support post 5 via the first gear 21, the second gear 23, and the toothed belt 25. As the submerged blade member 11 rotates under the force of the water flowing inside the discharge channel 56, the first strut 5 and the second strut 6 are inserted into the first strut insertion hole 7 and the second strut insertion hole, respectively. Since it is stored in the column insertion hole 8, the effect of reducing the time and cost required for removing the column is more reliably achieved than in the case of the fall prevention fences 1a and 1b.

14(a) and 14(c) show the external appearance of the first storage device 29 to which the third gear 33 is attached, and the second storage device 30 to which the third gear 33 and rotor blade 34 are attached, respectively. FIG. 14B and FIG. 14D are cross-sectional views of the first storage device insertion hole 31 and the second storage device insertion hole 32, respectively. Note that FIGS. 14(c) and 14(d) are views corresponding to FIGS. 3(a) and 3(b) in the fall prevention fence 1a described in Example 1, respectively.

FIG. 15(a) is a plan view showing the first storage device 29 or the second storage device 30 viewed from the open end side, and FIGS. 15(b) and 15(c) are respectively This figure shows a longitudinal section of the storage device 29 and the second storage device 30, and corresponds to the cross-sectional view taken along the line Q--Q in FIG. 15(a). FIG. 16(a) shows the external appearance of the third support 35 according to a modification of the second support 6, and FIGS. 16(b) and 16(c) show the appearance of the third gear 33 and the third support, respectively. The appearance of the gear holder 34 is shown. Moreover, FIG. 17 shows a state in which the fall prevention fence 1d of the present invention is installed, and is a diagram corresponding to FIG. 10(a) of the fall prevention fence 1c described in the third embodiment.
In addition, in FIG. 17, the toothed belt 25 is shown by a broken line. Further, in order to avoid complication of the drawing, illustration of the boundary line between the upper block 27 and the lower block 28 is omitted in FIG. 17. Further, the constituent elements shown in FIGS. 1 to 13 and 18 are designated by the same reference numerals, and the description thereof will be omitted as appropriate.

As shown in FIGS. 14(a) to 14(d), in the fall prevention fence 1d (see FIG. 17), in the fall prevention fence 1c, the first support 5 and the second support 6 are inserted into the first support. Instead of being loosely inserted into the hole 7 and the second column insertion hole 8, it is inserted into the first storage device insertion hole 31 and the second storage device insertion hole 32, whose central axes are parallel to the vertical direction, respectively. The first support 5 and the third support 35 are loosely inserted into the first storage device 29 and the second storage device 30, respectively, and the first storage device 29 replaces the first gear 21. and a third gear 33 installed on the upper part of the second storage device 30, and a third gear holder 39 for holding the third gear 33, and further installed on the second support 6. The present invention is characterized in that, instead of the blade member 11, a plurality of rotary blades 34 are installed on the lower end surface of the second storage device 30 protruding into the discharge channel 56.

The plurality of rotary blades 34 constitute a cross-flow water turbine whose rotation center is the central axis of the cylinder of the second storage device 30. Further, the second storage device insertion hole 32 is provided at the upper part of the water discharge channel 56.
Furthermore, as shown in FIG. 14(b), the first storage device insertion hole 31 has a bottom surface, whereas the second storage device insertion hole 32 has no bottom surface and has a lower end 32a. It's open. The second storage device insertion hole 32 is formed above the water discharge channel 56 such that a lower end 32a communicates with the water discharge channel 56.

As shown in FIGS. 15(a) to 15(c), the first storage device 29 and the second storage device 30 have a shape in which the lower end of a cylindrical body is closed, and a large diameter portion is formed above and below a small diameter portion 36b. It has a stepped structure in which portions 36a, 36a are provided. Note that the central axes of the large diameter portions 36a and 36a coincide with the central axes of the first storage device 29 and the second storage device 30. The inner diameter of the large diameter portion 36a of the first storage device 29 is the sum of the radius of the first support 5 and the width of the first locking portion 3a (the length parallel to the radial direction of the first support 5). The inner diameter of the large diameter portion 36a of the second storage device 30 is larger than the radius of the third support 35 and the width of the second locking portion 3b (the length parallel to the radial direction of the third support 35). greater than the sum of

The small diameter portions 36b of the first storage device 29 and the second storage device 30 are provided with a pillar insertion hole 37 and a pillar guide groove 38 that are circular in plan view. The center axis of the column insertion hole 37 coincides with the center axis of the large diameter portion 36a, and the column guide groove 38 protrudes outward from the inner peripheral surface of the column insertion hole 37 in parallel with the radial direction of the circle, and It is formed parallel to the central axis of the column insertion hole 37.
Further, the inner diameter of the column insertion hole 37 of the first storage device 29 is larger than the outer diameter of the first column 5, and the minimum width of the column guide groove 38 of the first storage device 29 (circumference of the column insertion hole 37) is larger than the outer diameter of the first column 5. The minimum length along the direction) is wider than the maximum width of the first locking portion 3a (the maximum length along the circumferential direction of the strut body 2). Further, the inner diameter of the column insertion hole 37 of the second storage device 30 is larger than the outer diameter of the third column 35, and the minimum width of the column guide groove 38 of the second storage device 30 (circumference of the column insertion hole 37) is larger than the outer diameter of the third column 35. The minimum length along the direction) is wider than the maximum width of the second locking portion 3b (the maximum length along the circumferential direction of the strut body 2).

As shown in FIG. 16(a), the third support 35 has the same structure as the second support 6 in which the blade member 11 is not installed. Further, as shown in FIGS. 16(b) and 16(c), the third gear 33 has a circular shape in plan view and an inner diameter that is outside the first storage device 29 and the second storage device 30. An insertion hole 33a larger than the diameter is provided. On one side of the third gear 33, a guide portion 33b, which is a short cylinder and has an inner diameter larger than the inner diameter of the insertion hole 33a, is provided such that the center axis of the cylinder coincides with the center axis of the insertion hole 33a. Note that the central axis of the insertion hole 33a coincides with the central axis of rotation of the third gear 33.
Note that the third gear 33, which has the insertion hole 33a and is fixedly installed in the first storage device 29 in an externally inserted state, is a second driven gear having the storage device insertion hole in the sixth invention. Correspondingly, the third gear 33, which has the insertion hole 33a and is fixedly installed in the second storage device 30 in an externally inserted state, is a second drive gear having the storage device insertion hole in the sixth invention. It corresponds to

On the other hand, the third gear holder 39 is made of a rectangular flat plate material, has a circular shape in plan view, and has an insertion hole 39a whose inner diameter is larger than the outer diameter of the first storage device 29 and the second storage device 30. It is provided so that its central axis is orthogonal to the flat plate material. Furthermore, a guide groove 39b having a circular shape in plan view is formed on one side of the third gear holder 39 so as to surround the insertion hole 39a. Note that the guide groove 39b has a width that allows the guide portion 33b of the third gear 33 to be placed therein, and is formed at a position such that the center of the circle is placed on the central axis of the insertion hole 39a. .

Therefore, when the third gear 33 is installed on one side of the third gear holder 39 so that the guide portion 33b is disposed inside the guide groove 39a, the insertion hole 33a of the third gear 33 and the The insertion hole 39a of the gear holder 39 of No. 3 is in a communicating state. At this time, the third gear holder 39 allows the third gear 33, in which the guide portion 33b is disposed inside the guide groove 39b, to rotate in a direction perpendicular to the central axis of rotation. It has the effect of regulating the movement of.

As shown in FIGS. 14(a) and 14(b) and FIG. It is fixed to the first storage device 29 or the second storage device 30 which is inserted into the insertion hole 33a (see FIG. 16(a)) in a state where it is aligned with the central axis of the device 30.
The first storage device 29 and the second storage device 30 are arranged such that the third gear 33 is rotatably held by the third gear holder 39 around the central axis of the insertion hole 33a. They are loosely inserted into the first storage device insertion hole 31 and the second storage device insertion hole 32, respectively. That is, the first storage device 29 and the second storage device 30 are rotatably inserted into the first storage device insertion hole 31 and the second storage device insertion hole 32, respectively. .

In the fall prevention fence 1d having the above structure, when the support main body 2 of the first support 5 is loosely inserted into the support insertion hole 37 of the small diameter part 36b, the lower end of the first locking part 3a is connected to the upper surface of the small diameter part 36b. 17, the first support 5 is prevented from moving downward by the small diameter portion 36b, so that the portion above the upper block 27 constituting the hollow portion 26 is suspended as shown in FIG. It is exposed above the ground.
Also, when the lower end of the second locking part 3b is locked to the upper surface of the small diameter part 36b with the support main body 2 of the third support 35 loosely inserted into the support insertion hole 37 of the small diameter part 36b. Since the third support column 35 is prevented from moving downward by the small diameter portion 36b, the portion above the upper block 27 forming the hollow portion 26 is exposed above the ground as shown in FIG. ing.

As shown in FIG. 17, the second storage device 30 has a structure in which the rotor blades 34 installed on the lower end surface are arranged near the ceiling surface 56a of the spillway 56, but the rotor blades 34 are not submerged in water. It becomes. However, when the water level of the river rises due to heavy rain or the like and the water surface 55 reaches the ceiling surface 56a of the spillway 56, the rotor 34 becomes submerged. At this time, the water flowing inside the discharge channel 56 generates a force that rotates the rotor blade 34 around the central axis of the cylinder of the second storage device 30 . As a result, the rotor blade 34 rotates together with the second storage device 30 about the central axis of the cylinder.
Due to the rotation of the second storage device 30, the second locking portion 3b aligns with the column guide groove 38 in the vertical direction, and the locked state between the upper surface of the small diameter portion 36b and the second locking portion 3b is released. Then, the third support 35 falls due to its own weight.

When the third gear 33 rotates together with the second storage device 30, all other components connected to the third gear 33 via the toothed belt 25 and fixedly attached to the first storage device 29 The third gear 33 rotates together with the first storage device 29.
Due to this rotation of the first storage device 29, the first locking portion 3a aligns with the column guide groove 38 in the vertical direction, and the locked state between the upper surface of the small diameter portion 36b and the first locking portion 3a is released. Then, the first support 5 falls due to its own weight.

In addition, in the fall prevention fence 1d, as the second storage device 30 in which the third support column 35 is loosely inserted rotates, all other first storage devices in which the first support column 5 is loosely inserted are rotated. As the device 29 rotates, the third support 35 and all the first supports 5 fall almost simultaneously, so the first support 5 is pulled by the wire 52 by the falling third support 35. The fall of the first support 5 may be inhibited, or the first support 5 next to the falling first support 5 may be pulled by the wire 52, thereby preventing the first support 5 from falling. No worries.

As described above, in the fall prevention fence 1d of the present invention, when the water level of the river rises due to heavy rain or the like and the rotor blades 34 are submerged, the rotor blades 34 and the rotor blades 34 are retracted into the second retractable position under the force of the water flowing through the waterway 56. When the device 30 rotates and the second locking portion 3b is no longer locked to the upper surface of the small diameter portion 36b, the third support 35 falls due to its own weight. The third gear 33, which rotates integrally with the second storage device 30, is connected to the third gear 33 via the toothed belt 25, and all other third gears fixed to the first storage device 29 The gear 33 rotates together with the first storage device 29, and the first locking portion 3a is released from the upper surface of the small diameter portion 36b, so that the column insertion hole 37 of the first storage device 29 is released. All the first columns 5, into which the column bodies 2 are loosely inserted, fall one after another due to their own weight.
That is, according to the fall prevention fence 1d, the rotation of the second storage device 30 is reliably transmitted to the first storage device 29 via the third gear 33, the second gear 23, and the toothed belt 25. Therefore, when the submerged rotor blade 34 rotates under the force of the water flowing inside the spillway 56, the first support 5 and the second support 6 move into the first storage device 29 and the second storage device 29, respectively. Since the pillars are stored in the storage device 30, the time and cost required for removing the pillars can be reduced more reliably than in the case of the fall prevention fences 1a and 1b.

Although wires 52 are used in the fall prevention fences 1a to 1d, metal chains or ropes may also be used instead of the wires 52. That is, the operation and effect of the present invention described above can be achieved not only by the wire 52 but also when the first support 5 and the second support 6 or the third support 35 are connected by a connecting body. be done. Note that the term "connecting body" refers to a member that has strength and can connect the first support 5 and the second support 6 or the third support 35, such as a metal wire or chain. Therefore, a rope made of synthetic fibers may be used as long as it has the same strength.

In the fall prevention fences 1c and 1d, the first support 5 controls the rotation of the first gear 21 into which the second support 6 is loosely inserted or the third gear 33 fixed to the second storage device 30. A toothed belt 25 is used as a drive belt for transmitting power to the loosely inserted first gear 21 or the third gear 33 fixed to the first storage device 29. Without limitation, a roller chain can also be used as the drive belt instead of the toothed belt 25. In this case as well, the functions and effects of the fall prevention fences 1c and 1d described in Examples 3 and 4 are similarly exhibited.

Further, in the fall prevention fences 1c and 1d, a slit wider than the wire 52 may be provided in the center of the upper wall portion 27a of the upper block 27 in the width direction, parallel to the side wall 27b. According to such a structure, when the first support 5 and the second support 6 or the third support 35 fall due to their own weight, the wire 52 passes through the slit of the upper block 27, and finally the wire 52 Since the wire 52 is stored inside the hollow portion 26, there is an advantage that the wire 52 is not easily damaged.
Furthermore, in the fall prevention fence 1d, instead of the rotary blades 34 constituting the cross-flow water turbine, paddle-type or Savonius-type rotary blades can also be used.
Furthermore, the fall prevention fences 1c and 1d may have a structure in which the fixture 4 is attached to the support main body 2 via the attachment 17 on the fall prevention fence 1b.

The present invention is applicable to the case where a fence is installed near the outlet (water outlet) of a waterway that discharges water used in a power plant into a river to prevent accidents involving people or vehicles from falling.

1a to 1d... Fall prevention fence 2... Support main body 2a... Side surface 2b... Lower end surface 3a... First locking part 3b... Second locking part 3c... Lower edge 4... Fixture 5... First support post 6... Second pillar 7... First pillar insertion hole 7a... Inner peripheral surface 7b... Upper end 7c... Slit 8... Second pillar insertion hole 8a... Inner peripheral surface 8b... Upper end 8c... Slit 8d... Lower end 9... First Guide groove 9a...first widened part 9b...first guide part 9c...bottom surface 9d...first opening part 10...second guide groove 10a...second widened part 10b...second guide part 10c...bottom surface 10d...Second opening 11...Blade member 11a...End face 12...Third support column 13...First cylindrical tube 13a...First slit 13b...Inner peripheral surface 14...First wall plate 15...Second Cylindrical tube 15a... Second slit 15b... Inner peripheral surface 16... Second wall plate 17... Mounting tool 18... First cylindrical body 18a... Outer circumferential surface 19... Second cylindrical body 19a... Outer circumferential surface 20... Bellows member 21... First gear 21a... Insertion hole 21b... Guide hole 21c... Guide portion 21d... Inner peripheral surface 22... First gear holder 22a... Insertion hole 22b... Guide hole 22c... Guide groove 23... Second gear 23a ...Shaft hole 23b...Guide part 24...Second gear holder 24a...Base 24b...Rotation shaft 24c...Guide groove 25...Toothed belt 26...Hollow part 27...Upper block 27a...Top wall part 27b...Side wall part 27c ...Insertion hole 28...Lower block 28a...Lower wall part 28b...Side wall part 28c...Insertion hole 28d...Guide hole 29...First storage device 30...Second storage device 31...First storage device insertion hole 32... Second storage device insertion hole 32a...Lower end 33...Third gear 33a...Through hole 33b...Guide part 34...Rotary blade 35...Third support column 36a...Large diameter portion 36b...Small diameter portion 37...Strut insertion hole 38 ...Strut guide groove 39...Third gear holder 39a...Insertion hole 39b...Guide groove 50...Fall prevention fence 51...Strut 52...Wire 53...Ground 54...Water outlet 55...Water surface 56...Waterway 56a...Ceiling surface

Claims (7)

A fall prevention fence installed near the outlet of a spillway formed underground,
a first column having a first column body having a long cylindrical shape and having a first locking portion on a side surface thereof so as to protrude in a direction perpendicular to the central axis;
a second column having a second column body having a long cylindrical shape and having a second locking portion provided on the side surface so as to protrude in a direction perpendicular to the central axis;
a fixture attached to the upper side of the first support main body and the second support main body, respectively;
A connecting body that connects the first support and the second support through the fixture;
A first support support having a size that allows the first support support and the second support support to be loosely inserted therein, an inner circumferential surface of which has a circular shape in a plan view, and is formed parallel to a vertical direction from the ground surface. a hole and a second pillar insertion hole;
Projects outward from the inner circumferential surface of the first column insertion hole parallel to the radial direction of the circle, and parallel to the vertical direction so as to have a size that allows the first locking part to be placed inside. a first guide portion formed to guide the first locking portion in the vertical direction when the first support main body is loosely inserted into the first support insertion hole;
Projects outward from the inner circumferential surface of the second column insertion hole in parallel to the radial direction of the circle, and is parallel to the vertical direction so as to have a size that allows the second locking part to be placed inside. a second guide portion that is formed in a shape and guides the second locking portion in the vertical direction when the second support main body is loosely inserted into the second support insertion hole;
The second pillar insertion hole is formed above the waterway so that the open lower end communicates with the waterway,
The second support has a blade member made of a flat plate material that is parallel to the radial direction of a circle formed by the edge of the second support main body, and a tip side end surface that protrudes outward from the edge. and a fall prevention fence installed on a lower end surface of the second column insertion hole protruding from the lower end into the waterway so that the flat surface is parallel to the vertical direction. The first through-hole has a keyhole shape and includes a first through-hole and a first guide hole, and the first through-hole is installed above the first support through-hole and is loosely inserted into the first through-hole. a first driven gear rotatably holding the first support;
The second through-hole has a keyhole shape and includes a second through-hole and a second guide hole, and the second through-hole is installed above the second support through-hole and is loosely inserted into the second through-hole. a first drive gear rotatably holding the second support;
comprising the first driven gear and a drive belt wound around the first drive gear,
The first guide hole has a size that allows the first locking part to be inserted loosely in a state where the first support main body is loosely inserted into the first insertion hole, and
The second guide hole has a size that allows the second locking part to be inserted loosely in a state where the second support main body is loosely inserted into the second insertion hole. The fall prevention fence according to claim 1. a first widened portion formed to a desired depth in parallel to the vertical direction from the ground surface so as to protrude outward from the inner circumferential surface of the first column insertion hole in parallel to the radial direction of the circle;
a second widened portion formed to a desired depth in parallel to the vertical direction from the ground surface so as to protrude outward from the inner circumferential surface of the second column insertion hole in parallel to the radial direction of the circle; Equipped with
The length of the first widened portion along the vertical direction is longer than the length of the first locking portion along the central axis direction of the first support main body,
The minimum length of the first pillar insertion hole of the first widened part along the circumferential direction is the length of the first pillar insertion hole of the first guide part along the circumferential direction. larger than the sum of the maximum value of the length and the maximum value of the length of the first locking part along the circumferential direction of the first support main body,
The minimum length of the second pillar insertion hole of the second widened part along the circumferential direction is equal to the minimum length of the second pillar insertion hole of the second guide part along the circumferential direction. larger than the sum of the maximum value of the length and the maximum value of the length of the second locking part along the circumferential direction of the second support main body,
The first widened portion is provided above the first guide portion, and has a width larger than the maximum length along the circumferential direction of the first support main body of the first locking portion on the bottom surface. A first opening having a wide width is formed to communicate with the first guide part,
The second widened portion is provided above the second guide portion, and has a bottom surface that is larger than the maximum length of the second locking portion along the circumferential direction of the second support main body. 3. The fall prevention fence according to claim 1, wherein a second opening having a wide width is formed to communicate with the second guide part. A first cylindrical tube having a size that allows the first support pillar to be loosely inserted therein is installed inside the first support support insertion hole, and
A first wall plate is installed to cover the inner surfaces of the first widened part and the first guide part,
The first cylindrical tube has a first slit on a side surface that communicates with the first widened part and the first guide part and has a width that allows the first locking part to be placed inside. It is provided,
A first space surrounded by the first wall plate in the first widened part is
The size is such that the first locking portion can rotate within a desired rotation angle range about the central axis when the first support main body is loosely inserted into the first cylindrical tube. have,
The width of the second space surrounded by the first wall plate in the first guide part is:
The fall prevention fence according to claim 3, characterized in that the width is narrower than the width of the first space. A second cylindrical tube having a size that allows the second support support to be loosely inserted therein is installed inside the second support support insertion hole, and
A second wall plate is installed to cover the inner surfaces of the second widened part and the second guide part,
The second cylindrical tube has a second slit on a side surface that communicates with the second widened part and the second guide part and has a width that allows the second locking part to be placed inside. It is provided,
A third space surrounded by the second wall plate in the second widened part is
The size is such that the second locking portion can rotate within a desired rotation angle range about the central axis when the second support main body is loosely inserted into the second cylindrical tube. have,
The width of the fourth space surrounded by the second wall plate in the second guide part is:
The fall prevention fence according to claim 3 or 4, characterized in that the width is narrower than the width of the third space. Instead of the first column insertion hole into which the first column is loosely inserted and the second column insertion hole into which the second column is loosely inserted,
A first storage device having a stepped structure in which the lower end of a cylindrical body is closed and a pair of large diameter portions above and below a small diameter portion, into which the first support is loosely inserted; a second storage device into which a support column is loosely inserted;
a first storage device insertion hole whose inner peripheral surface has a circular shape in plan view, is formed parallel to the vertical direction from the ground surface, and into which the first storage device is rotatably inserted; a second storage device insertion hole into which the storage device is rotatably inserted;
Instead of the first driving gear and the first driven gear,
A second driven gear and a second drive gear are fixedly installed in an extrapolated state on top of the first storage device and the second storage device, respectively,
The small diameter portions of the first storage device and the second storage device include:
a strut insertion hole having a size that allows the first strut and the second strut to be loosely inserted therein, an inner circumferential surface of which is circular in plan view, and formed parallel to the vertical direction;
Projects outward from the inner circumferential surface of the strut insertion hole in parallel with the radial direction of the circle, and has a size that allows the first locking part and the second locking part to be placed inside, respectively. A column guide groove is provided that is parallel to the vertical direction.
The second storage device insertion hole is
The open lower end is formed above the waterway so that it communicates with the waterway,
The drive belt is wound around the second driven gear and the second drive gear instead of the first driven gear and the first drive gear,
Instead of the blade member being installed on the second support, a plurality of rotary blades constituting a cross-flow water turbine are installed on the lower end surface of the second storage device that protrudes into the spillway. The fall prevention fence according to claim 2, characterized in that: a first cylindrical body and a second cylindrical body, which are respectively inserted into the first support main body and the second support main body;
A fitting that connects the first cylindrical body and the second cylindrical body to each other and includes a cylindrical bellows member having an inner diameter larger than an outer diameter of the first column main body and the second column main body. Equipped with
The fixture is
attached to the outer peripheral surfaces of the first cylindrical body and the second cylindrical body, respectively,
The first cylindrical body is fixed to the first support main body and the second support main body, respectively,
The second cylindrical body is installed below the first cylindrical body so as to be movable along the central axis of the first support main body or the second support main body. The fall prevention fence according to any one of claims 1 to 6.

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