JP2008063909A - Scaffolding and method of allowing person to move on screen using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To shorten working time for removing dust or the like on a screen. <P>SOLUTION: A scaffolding 1 is provided with a plate shaped tread member 2 which can hold person's feet and at least two supporting members 3 engaged with a screen 20 as well as supporting the tread member 2. Each supporting member has a bottom 4, a longitudinal direction part 5 and a hook-shaped engaging part 6. The bottom 4 is fixed to the rear surface of the tread member 2 and at least one part of the bottom 4 exists at a base end side edge part 7 (edge part) which is a rear surface of the tread member 2. The longitudinal direction part 5 stretches toward the surface side direction of the tread member 2 from the part existing at the base end side edge part 7 which is the rear surface of the tread member 2 in the bottom 4. The engaging part 6 continuously stretches to the longitudinal direction part 5 at the opposite side of the bottom 4 of the longitudinal direction part 5 and can be freely engageable/disengageable with/from the screen 20. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a scaffold used for human work and movement on a screen and a method of moving a person on a screen using the scaffold.

  In hydroelectric power generation facilities, intakes for taking in water used for power generation are provided in rivers and reservoirs. A grid-like screen is installed at the intake port to prevent inflow of dust (such as driftwood and branches) into the intake port. In addition, a similar screen is installed in a sand basin, a water tank, a water outlet, etc. provided between the water intake and the hydroelectric power generation facility in order to prevent the inflow of dust from the water channel. These screens require periodic inspections and repairs in order to maintain and manage the equipment.

  Conventionally, the entire screen has been scaffolded to perform inspections and repairs. However, if a scaffold is built over the entire screen, the scaffolding fee, installation and removal costs will be high. Furthermore, in order to perform these operations, it is necessary to stop the inflow of water and stop the water. For this reason, it is necessary to install a scaffold on the entire surface of the screen, perform inspections, repairs, etc., and stop the water for a period until the scaffold is removed. The longer the period of water stoppage, the lower the amount of power generation.

On the other hand, as a scaffold, a small scaffold that is large enough for an operator to ride is known (see, for example, Patent Documents 1 to 3). The scaffolds of Patent Documents 1 to 3 include a pair of engaging portions that are hooked and fixed to the upper end of a building wall or a building structural member such as a beam, a ladder, and the like, and a rod-shaped pole member supported by the engaging portion, And a long plate that spans over the pole member. When using these scaffolds, first, the engaging portion is hooked and fixed to a desired position such as a wall body. Next, a long plate is bridged on the pole member and fixed by screwing or the like to assemble the scaffold. An operator works on the long plate of the assembled scaffold. After the work, after removing the long plate from the pole member, the engaging portion is removed from the wall pair or the like, and the scaffold is removed.
Japanese Utility Model Publication No. 4-55948 JP 2001-303877 A JP-A-6-146571

  However, even if the scaffolds of Patent Documents 1 to 3 are used for the screen, the scaffold must be assembled by engaging the engaging portion with the screen and attaching the long plate to the pole member at the work location on the screen. When moving to the next work site, it is necessary to remove the long plate, dismantle the scaffold, and then remove the scaffold. For this reason, it is necessary to assemble and dismantle the scaffolds at each work location, and there is a problem that the work time becomes long in order to repair and inspect the entire screen.

  The present invention has been made in view of such points, and an object of the present invention is to shorten the work time for inspection and repair of the screen.

  A scaffold according to the present invention is a scaffold used for human work and movement on a grid-like screen installed in a water intake, a sand basin, a water tank, a water outlet, etc. And a plate-like tread member, and at least two support members that support the tread member and engage with the screen, and each of the support members is fixed to the back surface of the tread member and at least partially A bottom portion of the bottom surface of the tread member, a bottom portion of the bottom portion extending from the portion of the bottom surface of the tread member toward the front side of the tread member, and the bottom portion of the long portion. On the opposite side to the side, the scaffold has a hook-like engagement portion that extends continuously from the longitudinal portion and is detachable from the screen.

  According to the above scaffold, since the tread member is fixed to the bottom of the support member, the scaffold installation is completed simply by moving the scaffold with the tread member and hooking the engaging portion on the screen. Furthermore, when the scaffold is removed, the engagement between the engaging portion and the screen can be released simply by lifting the tread member. For this reason, since a scaffold can be easily installed and removed at each work location, the overall work time can be shortened.

  The method of moving a person on the screen according to the present invention is a method of moving a person on the screen in a grid-like screen installed in a water intake, a sand basin, a water tank, a water outlet, etc. A step of preparing a plurality of scaffolds, a foot on one of the scaffolds having an engagement portion engaged with the screen, and a foot on the other tread member of the scaffold with one hand A step of engaging an engaging portion of the other scaffold with the screen, a step of moving a foot from a tread member of the one scaffold to a tread member of the other scaffold, and a tread member of the other scaffold A person moves on a screen provided with the step of holding the tread member of the one scaffold with one hand and disengaging the engaging portion of the one scaffold from the screen while the foot is on Is the method.

  According to the method of moving a person on the screen, a person rides on one scaffold engaged with the screen, holds the body on the screen with one hand and supports the body on the screen, and the other scaffold with the other hand. It has a tread member. And the engaging part of another scaffold is hooked in the arbitrary locations of a screen. A foot is moved from the tread member of one scaffold to the tread member of the other scaffold one by one through the screen, and moved to the other scaffold. Thereby, it can move to the location of the screen which installed the other scaffold from the location of the screen which installed one scaffold. Further, while riding on another scaffold, the tread member of one scaffold engaged with the screen is lifted with one hand to disengage the engaging portion from the screen. One scaffold is further engaged with an arbitrary screen location and moved from the other scaffold to the one scaffold. By repeating these series of operations, it is possible to move to any location on the screen. For this reason, even if it does not install a scaffold in the whole screen surface, it can move, engaging / disengaging a several scaffold to the arbitrary locations of a screen.

  According to the present invention, it is possible to shorten work time for screen inspection, repair, and the like.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 1, a scaffold 1 according to an embodiment of the present invention is used when a person works on a screen 20 or moves.

  The screen 20 is installed at a water intake in a hydroelectric power generation facility. The intake port is provided in a river or a reservoir to take in water used for power generation. A sand basin is a facility installed near or in the middle of a waterway in order to prevent earth and sand flowing from the water intake from flowing down the waterway and damaging water turbines. The sand basin has a structure in which the sediment is naturally settled by reducing the flow velocity by enlarging the cross section of the flowing water, and has a waste sand facility. In addition, the water tank is provided to adjust the flow rate of the hydraulic pipe line and the flow rate of the water conduit along with the load fluctuation of the power plant, and to finally remove earth and sand and dust. The screen 20 is for preventing inflow into dust, for example, a water intake such as driftwood or branches. As shown in FIG. 2, the screen 20 includes a bar-like horizontal member 21 provided in the horizontal direction and a plate-like vertical member 22 provided perpendicular to the horizontal member 21, and these are assembled in a lattice shape. ing. The cross section of the horizontal member 21 is, for example, a circle having a diameter a of 19 mm. For example, the horizontal members 21 are arranged so that the interval b between them is 350 mm. The vertical members 22 are arranged, for example, so that the distance c between them is 80 mm. The horizontal member 21 and the vertical member 22 are welded and combined so that the horizontal member 21 penetrates substantially the center in the width direction of the vertical member 22. The overall size of the screen 20 is determined according to the size of the water intake, the sand basin, the water tank, the water outlet, and the like to be attached.

  The scaffold 1 used for human work and movement on the screen 20 is used by being attached to the screen 20 as shown in FIG.

  As shown in FIG. 4, the scaffold 1 includes a plate-shaped tread member 2 and at least two support members 3 that support the tread member 2 and engage the screen 20.

  The tread member 2 is a member on which a person's foot is placed. Here, the surface of the tread member 2 is a surface on the upper side when the scaffold 1 is engaged with the screen 20.

  The support member 3 has a bottom portion 4, a longitudinal portion 5, and an engagement portion 6 that can be freely engaged with and disengaged from the screen 20. The bottom 4 is fixed to the back surface of the tread member 2. At least a part of the bottom portion 4 exists at the edge of the back surface of the tread member 2. The bottom 4 is a rod-shaped member, and it is only necessary that one end be present at the edge that contacts the screen 20 on the back surface of the tread member 2. The longitudinal portion 5 extends from a portion of the bottom portion 4 at the edge of the back surface of the tread member 2 toward the front surface side of the tread member 2. The longitudinal portion 5 is continuous from one end of the bottom portion 4 so as to bend substantially perpendicularly from the back surface to the surface of the tread member 2 along the edge of the tread member 2. The engaging portion 6 extends continuously from the longitudinal portion 5 on the side opposite to the bottom 4 side of the longitudinal portion 5. The engaging portion 6 has a hook shape, and is engaged with the horizontal member 21 of the screen 20 to be engaged therewith. Specifically, it extends in parallel with the bottom portion 4 from the longitudinal portion 5 in the opposite direction to the tread member 2, and further extends in parallel with the longitudinal portion 5 toward the bottom portion 4.

  According to the scaffold 1 described above, since the tread member 2 is fixed to the bottom 4 of the support member 3, the scaffold 1 can be simply moved by holding the tread member 2 and hooking the engaging portion 6 on the screen 20. Installation is completed. Furthermore, when the scaffold 1 is removed, the engagement between the engaging portion 6 and the screen 20 can be released simply by lifting the tread member 2. For this reason, since the scaffold 1 can be easily installed and removed at each work location, the overall work time can be shortened.

  As shown in FIGS. 5A to 5C, the tread member 2 is formed in a rectangular shape. FIG. 5B is a side view showing an example of the scaffold 1 having a long longitudinal part 5, and FIG. 5C is a side view showing an example of the scaffold 1 having a short longitudinal part 5. Each of the tread members 2 has a rectangular shape in which the base end side edge portion 7 that is a side closer to the longitudinal portion 5 is a long side. Here, the base end side edge portion 7 is a portion that contacts the screen 20 of the tread member 2 when the scaffold 1 is attached to the screen 20.

  In this case, it is preferable that the length d of the base end side edge part 7 which is a long side of the tread member 2 is 20 cm or more and 50 cm or less. When d is less than 20 cm, when both feet of a person are put on, the feet protrude and the person is not stably supported. Moreover, when d is longer than 50 cm, the scaffold 1 becomes large, and it becomes inconvenient to carry.

  The length e of the side 11 which is a pair of parallel sides of the tread member 2 and is a short side perpendicular to the base side edge 7 is preferably 15 cm or more and 30 cm or less. When e is less than 15 cm, the portion of the person's foot that rides on the tread member 2 becomes small, and it becomes easier for the person to step on the foot. Moreover, when e is longer than 30 cm, the scaffold 1 becomes large and it becomes inconvenient to carry. The scaffold 1 is preferably small in order to be easily carried. By setting the tread member 2 to the above-described size, it is possible to provide a small scaffold 1 that is easy to carry and attach while ensuring a size that a person can ride.

  The base end side edge portion 7 of the tread surface member 2 is preferably formed with a base end side flange portion 9 extending to the surface side of the tread surface member 2 over the entire area. The support member 3 is such that at least a part of the bottom portion 4 exists at the base end side edge portion 7, is bent toward the surface side of the tread member 2 along the base end side edge portion 7, and is continuous with the longitudinal portion 5. It has become. Furthermore, a side opposite to the base end side edge 7 of the tread member 2, and a front end side edge 8 parallel to the base end side edge 7, extends to the surface side of the tread member 2 over the entire area. It is preferable that the front end side flange portion 10 is formed. Specifically, the base end side flange portion 9 and the front end side flange portion 10 are formed by bending the ends of the plates constituting the tread member 2.

  When a person gets on the tread member 2, a toe of a person's foot is usually placed on the proximal end side and a heel on the distal end side. If the proximal end side flange portion 9 and the distal end side flange portion 10 are formed on the proximal end side and the distal end side of the tread member 2, a person checks the edge of the tread member 2 by hitting these feet. be able to. For this reason, the fall from the scaffold 1 by a person stepping off the tread member 2 can be suppressed. These flange portions 9 and 10 are preferably formed to have a width of 0.5 cm or more and 3 cm or less so that a person can check with his / her feet and place his / her feet thereon. If the width of the flange portions 9 and 10 is less than 0.5 cm, it will be difficult for a person to check the flange portions 9 and 10 from above the shoe, or if the width is larger than 3 cm, either one of the flange portions This is because the body inclination becomes large and the work becomes difficult.

  Each support member 3 is composed of a single rod-shaped member. One end side of the support member 3 is a bottom portion 4 fixed to the back surface of the tread member 2, is bent along the edge of the tread member 2, and a central portion is formed as a longitudinal portion 5. The other end side of the support member 3 is configured as an engagement portion 6.

  It is preferable that two of the bottom parts 4 are respectively provided in the peripheral part of the side 11 of the tread member 2. Since both ends of the tread member 2 are supported by the support member 3, the tread member 2 is stably supported, and the work and movement on the scaffold 1 can be performed safely.

  It is desirable that the scaffold 1 be lighter in order to facilitate carrying. For this reason, it is preferable that there are two support members 3. If there are two support members 3, the tread member 2 can be stably supported.

  The longitudinal portion 5 of the scaffold 1 is formed on a side perpendicular to the side 11 which is a pair of parallel sides of the tread member 2, that is, on the base side edge 7 side and perpendicular to the bottom 4. Preferably it is. The scaffold 1 is preferably attached to the screen 20 so that the tread member 2 is horizontal so that a person on the tread member 2 can easily work or move. The scaffold 1 is attached such that the engaging portion 6 is engaged with the transverse member 21 and the longitudinal portion 5 is along the screen 20. Therefore, if the longitudinal portion 5 is formed perpendicular to the bottom portion 4, the scaffold 1 can be attached to the screen 20 so that the tread member 2 becomes horizontal or nearly horizontal. Here, the term “vertical” does not mean strict vertical, but means within a range including a slight inclination.

  The length f of the longitudinal portion 5 of the support member 3 is, for example, f = 250 mm as shown in FIG. 5B or f = 150 mm as shown in FIG. 5C.

  The scaffold 1 is preferably made of stainless steel and can be carried by a person with one hand. Specifically, when the scaffold 1 is made of stainless steel, the mass of the scaffold 1 can be 4 kg or less. This is because a mass larger than 4 kg makes it difficult for a person to carry with one hand. For this reason, a person can carry the scaffold 1 with one hand, and the screen 20 can be engaged and disengaged with one hand. Further, by making the scaffold 1 made of stainless steel, it is possible to secure the strength that can be supported when a person gets on, and to make the scaffold 1 excellent in corrosion resistance and durability.

  Next, a method for manufacturing the scaffold 1 according to the embodiment of the present invention will be described.

  First, a stainless steel plate is formed in a rectangular shape. The flanges 9 and 10 are formed by bending the vicinity of the edge on the long side of the plate in the same direction. In this way, the tread member 2 is formed.

  Next, two rod members of the same length made of stainless steel are prepared. From one end of the rod-shaped member, a portion having substantially the same length as the length e of the side 11 of the tread member 2 is bent vertically. This one end side is configured as the bottom portion 4. A portion from the bottom 4 to the length f toward the other end is configured as a longitudinal portion 5. A portion having a length f from the bottom portion 4 of the rod-shaped member is bent in a direction opposite to the bottom portion 4 in parallel with the bottom portion 4 and further in a direction toward the bottom portion 4 in parallel with the longitudinal portion 5. This other end side is configured as the engaging portion 6. In this way, the support member 3 is formed.

  Next, the support member 3 is welded to the surface opposite to the direction in which the flange portions 9 and 10 of the tread member 2 are bent, that is, the back surface side. Specifically, the side on which the longitudinal portion 5 of the bottom portion 4 exists is welded to the side edge 11 side edge portion of the back surface of the tread member 2.

  The scaffold 1 can be easily manufactured by welding two members, a tread member 2 and a support member 3 formed into a predetermined shape.

Next, a description will be given of a method of moving a person on the screen 20 using the scaffold 1 according to the embodiment of the present invention. A plurality of scaffolds 1 are prepared. The scaffold 1 may be at least two, and is composed of a mass and a size that can be carried by a person with one hand.

  The engaging portion 6 of one of the scaffolds 1 is engaged with the transverse member 21 at an arbitrary position of the screen 20. At this time, the scaffold 1 may be engaged after climbing up to an arbitrary height by the ladder 23 (shown only in FIG. 1).

  Then, the user puts his / her foot on the tread member 2 of the one scaffold 1 and holds it on the screen 20 to support the body.

  Next, while holding the screen 20 with one hand, the tread member 2 of the other scaffold 1 of the scaffold 1 is held with the other hand. The engaging part 6 of the other scaffold 1 is engaged with the lateral member 21 at an arbitrary position of the screen 20.

  Next, one of the legs is moved from the tread member 2 of one scaffold 1 to the tread member 2 of the other scaffold 1 while being held by the screen 20, and moved from one scaffold 1 to the other scaffold 1. Thereby, it can move to the location of the screen 20 in which the other scaffold 1 was installed from the location of the screen 20 in which the one scaffold 1 was installed.

  Further, in a state where the foot is placed on the tread member 2 of the other scaffold 1, the tread member 2 of the one scaffold 1 engaged with the screen 20 is lifted with one hand, and the engagement portion 6 and the screen 20 are engaged. Remove the match. One scaffold 1 is further engaged with 20 arbitrary screens and moved from the other scaffold 1 to the one scaffold 1.

  By repeating these series of operations, it is possible to move to an arbitrary location on the screen 20. Since the scaffold 1 can be easily detached from the screen 20 with one hand, the installation and removal time of the scaffold 1 is short, and the working time can be shortened. Furthermore, even if a scaffold is not installed on the entire surface of the screen 20, it is possible to move the scaffold 1 to an arbitrary location on the screen 20 while sequentially disengaging the scaffold 1. In particular, when it is desired to move sideways at the height of the screen 20, the movement time is shorter than when the ladder 23 is once lowered, the ladder 23 is moved, and the ladder 23 is moved up again. Time can be shortened.

  In addition, the above-mentioned embodiment is an illustration of this invention, Comprising: This invention is not limited to this example.

  For example, in the scaffold 1 according to the present embodiment, the support member 3 is a rod-shaped member, but may be a plate-shaped member.

  Moreover, in the scaffold 1 which concerns on this embodiment, although the supporting member 3 shall be comprised by one rod-shaped member, the bottom part 4, the longitudinal part 5, and the engaging part 6 are comprised by a separate member. It may be.

  Moreover, in the scaffold 1 which concerns on this embodiment, although the tread member 2 is formed in the rectangular shape, it is not limited to this shape, For example, you may be formed in the ellipse shape.

  Moreover, in the scaffold 1 which concerns on this embodiment, although the support member 3 was two, three or more may be sufficient. However, in order to reduce the weight of the scaffold 1, two are preferable.

  Moreover, although the scaffold 1 according to the present embodiment is made of stainless steel, it may be made of iron. However, in order to reduce the weight of the scaffold 1 and the like, it is preferably made of stainless steel.

  In the present embodiment, the scaffold 1 is used on a screen installed at a water intake or the like in a hydroelectric power generation facility, but is installed at a water intake or a water discharge port of a thermal power plant or a nuclear power plant. It can also be used for screen inspection and repair work.

  As described above, the scaffold according to the present invention can reduce the working time, and thus is useful when a person moves on the screen.

It is a figure which shows a mode that a person works on a screen using the scaffold which concerns on embodiment of this invention. It is a front view which shows a part of screen. It is a perspective view which shows a screen and the scaffold engaged with this. It is a perspective view which shows the scaffold which concerns on embodiment of this invention. The scaffold is shown, (a) is a plan view seen from the surface side of the tread member, (b) is an example of a side view, (c) is another example of a side view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Scaffold 2 Tread surface member 3 Support member 4 Bottom part 5 Longitudinal part 6 Engagement part 7 Base end side edge part 8 Front end side edge part 9 Base end side flange part (flange part)
10 Tip side flange (flange)
20 screens

Claims (6)

In a grid-like screen installed in a water intake, a sand basin, a water tank, a water outlet, etc., a scaffold used for human work and movement on the screen,
A plate-shaped tread member on which a person's foot can be placed;
Including at least two support members that support the tread member and engage the screen;
Each of the support members is
A bottom portion fixed to the back surface of the tread member, and at least a portion of which is located at an edge of the back surface of the tread member;
A longitudinal portion extending from the portion of the bottom portion located on the edge of the back surface of the tread member toward the front side of the tread member;
A hook-like engagement portion that extends continuously from the longitudinal portion on the side opposite to the bottom side of the longitudinal portion and is detachable from the screen;
Scaffold with. The scaffold of claim 1,
The tread member is rectangular,
A flange portion extending in the surface side direction is formed on a base end side edge portion that is a side closer to the longitudinal portion of the tread member and a front end side edge portion that is a side facing the base end side edge portion. Has been a scaffold. The scaffold of claim 1,
The tread member is rectangular,
Two of the bottom parts are respectively provided in the periphery of a pair of parallel sides of the tread member,
The longitudinal portion is a scaffold formed on a side perpendicular to the pair of parallel sides of the tread member and perpendicular to the bottom. The scaffold of claim 1,
The tread member is rectangular, and the side close to the longitudinal portion is a long side,
The short side of the tread member is 15 cm or more and 30 cm or less,
A long side of the tread member is a scaffold of 20 cm or more and 50 cm or less. The scaffold of claim 1,
Scaffolding made of stainless steel that can be carried with one hand. In a grid-like screen installed in a water intake, a sand basin, a water tank, a water outlet, etc., a method in which a person moves on the screen,
Preparing a plurality of scaffolds according to any one of claims 1 to 5;
A foot is placed on the tread member of one scaffold of which the engaging portion is engaged with the screen of the scaffold, the tread member of the other scaffold is held with one hand among the scaffolds, and the engaging portion of the other scaffold Engaging the screen with the screen;
Moving the foot from the tread member of the one scaffold to the tread member of the other scaffold;
With one foot holding the tread member of the one scaffold with one foot on the tread member of the other scaffold, releasing the engagement between the engaging portion of the one scaffold and the screen;
To move people on the screen with

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