JP7450463B2 - Radial gate installation method and radial gate support structure - Google Patents

Description

Application of Article 30, Paragraph 2 of the Patent Act Kyushu Electric Power Co., Inc., in “Electric Power Civil Engineering July 2019 issue”, published “Radial gate installation method and radial gate support structure” invented by Yui Takamasa et al. A paper titled "Design and Construction of Large Spillway Gate Facility with Sand Passage Function" was published.

The present invention relates to a method for installing a radial gate used in a crest gate of a dam, and a support structure for the radial gate.

Conventionally, when replacing a radial gate on a dam, a gate assembly method involves assembling a new radial gate after removing the existing radial gate in the vicinity of the installation location where the replacement gate is installed. is known (for example, see Patent Document 1).

Japanese Patent Application Publication No. 2015-190185

However, in the radial gate installation method as in Patent Document 1, the radial gate is assembled on a gate cradle on an auxiliary rail installed directly on the embankment body through which water flows during water discharge, so during the installation work There is a problem in that even if there is an urgent need to spray water, it is not easy to do so.

The present invention has been made in view of these points, and its purpose is to enable radial gate installation work to be carried out in a state where water can be sprayed even during the installation of the radial gate in the event of a typhoon, etc. be.

In order to achieve the above object, the present invention enables installation work to be carried out while maintaining the radial gate in an open state where water can be released.

Specifically, in the first invention, a radial gate is installed that is rotatably supported by a pair of piers around a horizontal rotation axis and can adjust the flow rate of water flowing between the pair of piers. A method,
A door that supports the radial gate in an open state where the door body of the radial gate allows water flow to pass between the pair of piers when performing reinforcement for concrete placement of the pair of piers. a step of installing embedded metal fittings for fixing the body temporary stage in parallel at opposing positions on opposing surfaces of the pair of piers;
and a concrete pouring step of pouring concrete with the embedded metal fittings in place.

According to the above configuration, when forming the pier, the embedded metal fittings can be provided at appropriate positions so that the radial gate can be assembled while supporting it in an open state at an appropriate angle. Even while the door is being assembled on the temporary stage, it is possible to spray water below it.

In the second invention, in the first invention,
In the above embedded metal fitting installation process,
A vertical plate is positioned in front of a vertically extending reinforcing bar closest to the door body that constitutes the pier, and the embedded metal fitting is placed in the form of a frame on the surface of the door body side of the pier on the front side of the vertical plate. a container-shaped container with the door body side open, having a plurality of side plates between the frame-shaped body and the vertical plate so that the body can be positioned;
A plurality of anchor bolts are inserted into the vertical plate, extending further back than the vertically extending reinforcing bars closest to the door body, and capable of fastening the door body support beams constituting the temporary door stage on the front side. composition.

According to the above configuration, the embedded metal fitting can be made highly rigid and able to withstand the weight of the radial gate. Additionally, it is possible to install a somewhat large embedded metal fitting that can withstand the weight of the radial gate while maintaining the concrete cover thickness.

In the third invention, in the second invention,
Fasten a bracket for fixing the temporary stage of the door body to the anchor bolt,
Both ends of the door support beam are fixed to the opposing brackets, respectively.

According to the above configuration, since the embedded metal fitting is embedded in advance at a predetermined position of the pier, by fastening the bracket to the anchor bolt, it is possible to fix the door support beam extremely easily.

In a fourth invention, in any one of the first to third inventions,
The radial gate is installed while discharging water below the temporary gate stage.

According to the above configuration, the temporary gate stage is provided to support the radial gate in the open state, so there is no need to remove the temporary stage for the gate body, etc. when a typhoon occurs while the radial gate is being installed. Water can be sprayed below it.

In a fifth invention, in any one of the first to fourth inventions,
Assemble the radial gates one after another on the temporary stage of the gate body,
After installing the rotating means for rotating the radial gate,
The door temporary stage is removed while the radial gate is rotated upward by the rotation means.

According to the above configuration, since the radial gate can be rotated upward by the power of the rotating means, the door temporary stage can be removed without lifting the radial gate with a crane or the like.

In the sixth invention, in the fifth invention,
After the door temporary stage is removed, the frame-like body of the embedded metal fitting is closed and sealed.

According to the above configuration, the anchor bolts of the embedded fittings are sealed, so they will not look bad or rust.

In the seventh invention, a radial gate is rotatably supported on a pair of vertically erected piers around a horizontal rotation axis, and is capable of supporting a radial gate that can adjust the amount of water flowing between the pair of piers. Targeting the support structure of the temporary cradle of the radial gate,
The above support structure is
An embedded metal fitting for fixing a gate temporary stage that supports the radial gate in an open state where the gate body of the radial gate is kept open to allow water flow to pass between the pair of piers. They are buried in concrete in parallel at opposite positions on opposite sides of the pier.

According to the above configuration, when forming the pier, the embedded metal fittings can be provided at appropriate positions so that the radial gate can be assembled while supporting it in an open state at an appropriate angle. Even while the door is being assembled on the temporary stage, it is possible to spray water below it.

In the eighth invention, in the seventh invention,
The above embedded metal fittings are
a vertical plate buried in front of a vertically extending reinforcing bar closest to the door body that constitutes the pier;
a frame-shaped body provided on the surface of the door body side of the pier;
The door body side is open and has a plurality of side plates connecting the frame-like body and the vertical plate, and is in the shape of a container;
The vertical plate has a plurality of brackets that extend further back than the vertically extending reinforcing bars closest to the door body, and to which brackets can be fastened to the front side for fixing the door support beams that constitute the temporary door stage. It is buried in concrete with anchor bolts inserted.

According to the above configuration, the embedded metal fitting can be made highly rigid and able to withstand the weight of the radial gate. In addition, it is possible to obtain a somewhat large embedded metal fitting that can withstand the weight of the radial gate while maintaining the concrete cover thickness.

In the ninth invention, in the eighth invention,
The pair of opposing embedded metal fittings are configured to be able to span over the door body supporting beams, which are bolted together.

According to the above configuration, since the embedded metal fitting is embedded in advance at a predetermined position of the pier, by fastening the bracket to the anchor bolt, it is possible to fix the door support beam extremely easily.

In the tenth invention, in the eighth invention,
After the door body is installed, the frame-shaped body of the embedded metal fitting is covered with a lid so that the door body can be closed in a watertight manner.

According to the above configuration, the anchor bolts of the embedded fittings are sealed, so they will not look bad or rust.

In an eleventh invention, in any one of the seventh to tenth inventions,
The embedded metal fittings are arranged in parallel so that the door temporary stage can hold the door at a predetermined height higher than the water surface of the designed flood water volume.

According to the above configuration, even if the water level suddenly rises due to a typhoon or the like, water can be appropriately sprayed while the temporary stage of the door body, etc. remains in place, so safety is greatly improved.

As described above, according to the present invention, it is possible to install a radial gate in a state where water can be sprayed even during the installation of the radial gate in the event of a typhoon or the like.

FIG. 2 is a perspective view of a dam in which a radial gate is installed, viewed from the downstream side. It is a perspective view corresponding to FIG. 1 showing a state in which a bracket and a door support beam are fixed to an anchor pad of a pier. FIG. 2 is a perspective view corresponding to FIG. 1 showing a state in which the legs are assembled on the door temporary stage. FIG. 2 is a perspective view corresponding to FIG. 1 illustrating a state in which a hydraulic cylinder is attached to a leg on a temporary door stage. FIG. 2 is a perspective view corresponding to FIG. 1 showing a state in which the door mounting portion is attached to the legs on the temporary door stage. FIG. 2 is a perspective view corresponding to FIG. 1 showing a state in which the door body is attached to the door body mounting portion on the door temporary stage. FIG. 3 is a side view showing a pier provided with an anchor pad. FIG. 3 is a schematic side view showing the positional relationship between the temporary door stage and the radial gate. It is a sectional view showing a pier to which a door body temporary stage is attached. It is a sectional view showing an anchor pad closed with a sealing lid and its surroundings.

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a perspective view of a dam in which a radial gate 10 according to an embodiment of the present invention is installed, viewed from the downstream side. Although not shown in detail, the dam includes a dam body 2 made of concrete or the like, and at least one pair of piers (concrete piers) 3 are provided perpendicularly to the dam body 2. That is, when a plurality of gates are provided, a plurality of pairs of peers 3 are provided. Water in the reservoir can be discharged beyond the embankment body 4. A support structure 1 for a radial gate 10 is provided on these pairs of piers 3. Note that the right pier 3 is omitted in FIGS. 1 to 7.

Specifically, a radial gate 10 is supported by the illustrated pair of piers 3 so as to be rotatable about a horizontal rotation shaft 10a (see FIGS. 1, 8, etc.). The radial gate 10 is configured such that the flow rate of water flowing between the pair of piers 3 can be adjusted by vertically rotating the radial gate 10 by expanding and contracting a pair of hydraulic cylinders 13 as rotating means.

The radial gate 10 includes, for example, a pair of legs 11 that are horizontally spaced apart and have a triangular shape in side view, and a gate body that is fixed to the upstream side of the pair of legs 11 and whose outer peripheral surface has an arc-shaped cross section. 12. Rod tips 13a of a pair of hydraulic cylinders 13 are connected to a pedestal (boss portion) 11a on the lower side of the door body 12. For example, when the hydraulic cylinder 13 is contracted, the door body 12 is rotated upward about its rotation axis 10a, and water in the reservoir can be discharged onto the embankment body 4. Conversely, when the pair of hydraulic cylinders 13 are extended, the lower end of the door body 12 comes into contact with the upper surface of the embankment body body 4, and water in the reservoir cannot be discharged.

In the embodiment of the present invention, as shown in FIGS. 7 and 8, a plurality of anchor pads 20 as embedded fittings are arranged in parallel at opposing positions on opposing surfaces of a pair of piers 3. It is buried in concrete 3a. These anchor pads 20 fix a temporary gate stage 40 that supports the door body 12 of the radial gate 10 in an open state where the gate body 12 allows water flow to pass between the pair of piers 3. It is provided for.

Specifically, as illustrated in an enlarged cross-section in FIG. 9, these anchor pads 20 are embedded in the surface of the concrete 3a on the radial gate 10 side of each pier 3 so that the surface side is open. In other words, the anchor pad 20 consists of a vertical plate 22 buried in front of the vertically extending reinforcing bar 3b closest to the door body 12 that constitutes the pier 3, and a frame-shaped plate provided on the surface of the pier 3 on the door body 12 side. It has a container shape with the door body 12 side open, which has a body 21 and a plurality of (four) side plates 23 that connect the frame body 21 and the vertical plate 22. Then, a bracket 30 is fastened to the vertical plate 22, extending further back than the vertically extending reinforcing bars 3b closest to the door body 12, and fixing the door support beam 41 that constitutes the temporary door stage 40 on the front side. A plurality of anchor bolts 26 are inserted through which nuts 27 are provided. For example, the lower side of the side plate 23 is thicker than the upper side, where loads are easily applied, and is firmly reinforced by reinforcing ribs 24 connected to the frame-shaped body 21. Further, the base end sides of the four anchor bolts 26 are fixed to a bearing plate 25 made of a relatively thick steel plate and arranged on the back side. A bracket fixing bolt 31 for fixing the bracket 30 to the nut 27 can be fastened.

The pair of opposing anchor pads 20 are configured to be able to span over the door support beams 41 in a state where they are bolted together via the brackets 30.

As shown in FIGS. 7 and 8, the anchor pads 20 are arranged in such a way that the temporary door stage 40 can hold the door 12 at a predetermined height (for example, 1.5 m) higher than the water surface of the design flood water level. It is set up.

As shown in FIG. 10, after the door body 12 is installed and the door temporary stage 40 is removed, the frame body 21 of the anchor pad 20 is sealed watertightly by the airtight lid 28, so the anchor The presence of the pad 20 can be visually confirmed only by the sealing lid 28 that closes off the anchor pad 20 and the frame-shaped body 21.

-How to install a radial gate-
Next, a method for installing the radial gate 10 according to this embodiment will be explained.

First, a pair of peers 3 are provided. These pair of piers 3 may be newly provided in a part of the existing dam body 2, or when forming a new dam, they may be provided together with the dam body 4 and the like.

As shown in FIG. 9, in the anchor pad installation process, a plurality of anchor pads 20 are provided in the reinforcing process when forming the pier 3 by pouring concrete. A plurality of container-shaped anchor pads 20 with the door body 12 side open are arranged in parallel around reinforcing bars 3b and 3c extending vertically and horizontally at opposing positions on opposing surfaces of a pair of piers 3.

Then, on the vertical plate 22, there is a nut 27 extending further back than the vertically extending reinforcing bar 3b closest to the door body 12, and for fastening the door support beam 41 that constitutes the temporary door stage 40 on the front side. A plurality of provided anchor bolts 26 are inserted. A bearing plate 25 is fixed to the back side of the anchor bolt 26.

Next, in a concrete pouring step, concrete 3a is poured with the anchor pads 20 and anchor bolts 26 arranged. As shown in FIG. 7, anchor pads 20 are arranged in parallel on the pier 3 after pouring. By doing so, the anchor pad 20 can be made highly rigid to withstand the weight of the radial gate 10. Furthermore, it is possible to install a somewhat large anchor pad 20 that can withstand the weight of the radial gate 10 while maintaining the cover thickness of the concrete 3a. Furthermore, since the anchor pad 20, including the bearing plate 25, is buried in the concrete 3a, the compressive load applied to the anchor pad 20 can be supported by the concrete 3a over a wide range.

Next, as shown by the two-dot chain line in FIG. 9, a bracket 30 for fixing the temporary door stage 40 is fastened to the anchor bolt 26 of the anchor pad 20. At this time, for example, an aerial work vehicle is installed on the embankment main body 4, the brackets 30 are fitted into the recesses of each anchor pad 20, and the bracket fixing bolts 31 are fastened to the nuts 27. As shown in FIG. 8, brackets 30 are arranged in parallel to match the shape of the legs 11 of the radial gate 10 so that the radial gate 10 is kept open.

Next, both ends of the door support beam 41 are fixed to the opposing brackets 30, respectively. For example, the gate supporting beam 41 is lifted up by a crane provided on the dam body 2, and the engaging portions 42 at both ends thereof are fitted. At this time, since the bracket 30 has been fastened to a predetermined position on the pier 3 in advance, the door support beam 41 can be fixed very easily. As shown in FIGS. 2 and 8, both ends of the door support beams 41 corresponding to all the brackets 30 are engaged. The shapes of the door support beams 41 do not all have to be the same, and may differ depending on the installation location. After connecting the pair of brackets 30 with the door support beam 41, a scaffold (not shown) for the work is assembled.

Next, the radial gates 10 are assembled one after another on the temporary gate stage 40. For example, as shown in FIG. 3, the pedestal 11a supported by the rotation shaft 10a is first installed, the lower leg 11b is installed so as to straddle the plurality of door support beams 41, and then the lower lateral Assemble the main girder 11c, etc. At this time, as shown in FIG. 8, a jack 43 may be provided on the door support beam 41 as appropriate to support the load of the radial gate 10 via the jack 43. The door support beam 41 without the jack 43 may be used to support the weight of the scaffolding. Note that the door body 12 is rotatable along a fan-shaped locus 12a shown in FIG.

Next, as shown in FIG. 4, a pair of hydraulic cylinders 13 are installed as rotating means for rotating the radial gate 10. For example, the cylinder support shafts 13c extending from the tube intermediate portions 13b of the pair of hydraulic cylinders 13 are swingably supported by the pair of piers 3, respectively.

Next, as shown in FIG. 5, the vertical main girder 11d arranged on the back side of the arcuate outer peripheral surface, the remaining horizontal main girders, etc. are assembled. A working scaffold 44 may be provided at the radial gate 10 as needed.

Next, as shown in FIG. 6, skin plate panels are laminated to complete the door body 12 having an arcuate outer peripheral surface. Around this time, the rod tip 13a is rotatably connected to a boss provided near the lower horizontal main girder 11c. Although not shown in detail, a hydraulic unit for driving the hydraulic cylinders 13 is installed at the top of the dam body 2, and by operating the control valve of this hydraulic unit from the operation panel, the pair of hydraulic cylinders 13 can be operated. Expansion and contraction operations are possible. Thereby, when the pair of hydraulic cylinders 13 are expanded or contracted, the radial gate 10 is rotated up and down about the rotation axis 10a. Therefore, after the hydraulic cylinder 13 is connected, the weight of the radial gate 10 may be supported by the hydraulic cylinder 13. The opening degree of the radial gate 10 is maintained by a pilot check valve installed in the hydraulic unit to prevent oil from the head side of the hydraulic cylinder from returning to the tank.

As a feature of the present invention, as shown in FIG. 8, even during this work, the radial gate 10 can be installed while discharging water below the temporary gate stage 40.

Next, while the radial gate 10 is rotated upward by the hydraulic cylinder 13, the temporary door stage 40 is removed. At this time, since the radial gate 10 can be rotated upward by the power of the hydraulic cylinder 13, the door temporary stage 40 can be removed without lifting the radial gate 10 with a crane or the like.

After removing the gate temporary stage 40, as shown in FIG. 1, when the lower end of the gate 12 is brought into contact with the upper surface of the embankment main body 4, the radial gate 10 will be in a closed state.

Next, as shown in an enlarged view in FIG. 10, the frame-shaped body 21 of the anchor pad 20 is closed and sealed with a rectangular plate-shaped sealing lid 28. For example, the surface of the sealing lid 28 is welded to the frame-shaped body 21, and then the surface heights are made equal. In this case, the anchor bolts 26 of the anchor pad 20 are sealed, so they will not look bad or rust.

In this way, in this embodiment, when forming the pier 3, the anchor pad 20 can be provided at an appropriate position so that the radial gate 10 can be assembled while supporting it in an open state at an appropriate angle. Even while the radial gate 10 is being assembled on this temporary gate stage 40, water can be sprayed below it.

In other words, since the temporary door stage 40 is provided to support the radial gate 10 in the open state, there is no need to remove the temporary stage 40 etc. when a typhoon occurs while the radial gate 10 is being installed. Water can be sprayed easily and quickly below it.

Therefore, according to the method for installing the radial gate 10 according to the present embodiment, the radial gate 10 can be installed in a state where water can be sprayed even during the installation of the radial gate 10 in the event of a typhoon or the like.

(Other embodiments)
The present invention may have the following configuration for the above embodiment.

That is, in the above embodiment, the radial gate 10 is provided between a pair of piers 3 in a dam, but it can also be applied to a case where the radial gate 10 is provided between a pair of piers in a water gate provided in a river.

Further, in the above embodiment, an example is shown in which the embedded metal fitting is the anchor pad 20, but the shape of the embedded metal fitting is not limited to this, and may be any shape as long as it can support the door temporary stage 40. For example, a pedestal-like structure capable of supporting the door support beam 41 without using the anchor bolt 26 may be embedded in the concrete 3a.

Note that the above embodiments are essentially preferable examples, and are not intended to limit the scope of the present invention, its applications, or uses.

1 Support structure
2 Dam body
3 Peer
3a concrete
3b, 3c reinforcing bar
4 Embankment body body
10 Radial gate
10a Rotation axis
11 Legs
11a Pedestal
11b Lower leg
11c Lower horizontal main girder
11d Vertical main girder
12 Door body
12a Fan-shaped trajectory
13 Hydraulic cylinder (rotating means)
13a Rod tip
13b Tube middle part
13c Cylinder support shaft
20 Anchor pad (embedded metal fitting)
21 Frame-shaped body
22 Vertical plate
23 Side plate
24 Reinforcement rib
25 Bearing plate
26 Anchor Bolt
27 Nut
28 Sealing lid (lid)
30 bracket
31 Bracket fixing bolt
40 Temporary door stage
41 Door support beam
42 Engagement part
43 Jack
44 Work scaffolding

Claims (11)

A method of installing a radial gate rotatably supported by a pair of piers around a horizontal rotation axis and capable of adjusting the flow rate of water flowing between the pair of piers, the method comprising:
A door that supports the radial gate in an open state where the door body of the radial gate allows water flow to pass between the pair of piers when performing reinforcement for concrete placement of the pair of piers. a step of installing embedded metal fittings for fixing the body temporary stage in parallel at opposing positions on opposing surfaces of the pair of piers;
A method for installing a radial gate, comprising the step of pouring concrete with the embedded metal fittings in place. The radial gate installation method according to claim 1,
In the above embedded metal fitting installation process,
A vertical plate is positioned in front of a vertically extending reinforcing bar closest to the door body that constitutes the pier, and the embedded metal fitting is placed in the form of a frame on the surface of the door body side of the pier on the front side of the vertical plate. a container-shaped container with the door body side open, having a plurality of side plates between the frame-shaped body and the vertical plate so that the body can be positioned;
A nut for fastening a bracket to the vertical plate, which extends further back than the vertically extending reinforcing bar closest to the door body, and to which a door support beam constituting the temporary door stage is fixed to the front side; A radial gate installation method characterized by inserting a plurality of provided anchor bolts. The radial gate installation method according to claim 2,
Fasten a bracket for fixing the temporary stage of the door body to the anchor bolt,
A method for installing a radial gate, comprising fixing both ends of the gate support beam to the opposing brackets. The method for installing a radial gate according to any one of claims 1 to 3,
A method for installing a radial gate, comprising installing the radial gate while discharging water below the temporary gate stage. The method for installing a radial gate according to any one of claims 1 to 4,
Assemble the radial gates one after another on the temporary stage of the gate body,
After installing the rotating means for rotating the radial gate,
A method for installing a radial gate, comprising removing the temporary door stage while the radial gate is rotated upward by the rotation means. The radial gate installation method according to claim 5,
A method for installing a radial gate, characterized in that after removing the temporary stage of the gate body, the frame-like body of the embedded metal fitting is closed and sealed. A temporary holder for a radial gate that is rotatably supported by a pair of vertically erected piers around a horizontal rotation axis and that can support a radial gate that can adjust the amount of water flowing between the pair of piers. a support structure for
An embedded metal fitting for fixing a gate temporary stage that supports the radial gate in an open state where the gate body of the radial gate is kept open to allow water flow to pass between the pair of piers. A support structure for a radial gate, characterized in that the support structure is embedded in concrete in a state in which they are arranged in parallel at opposite positions on opposite sides of a pier. The radial gate support structure according to claim 7,
The above embedded metal fittings are
a vertical plate buried in front of a vertically extending reinforcing bar closest to the door body that constitutes the pier;
a frame-shaped body provided on the surface of the door body side of the pier;
The door body side is open and has a plurality of side plates connecting the frame-like body and the vertical plate, and is in the shape of a container;
The vertical plate has a plurality of brackets that extend further back than the vertically extending reinforcing bars closest to the door body, and to which brackets can be fastened to the front side for fixing the door support beams that constitute the temporary door stage. A radial gate support structure characterized by being buried in concrete with anchor bolts inserted through it. The radial gate support structure according to claim 8,
A support structure for a radial gate, wherein the pair of opposing embedded fittings are configured such that the door support beam can be spanned with the bracket being bolted. The radial gate support structure according to claim 8,
A support structure for a radial gate, characterized in that, after the door body is installed, the frame-like body of the embedded metal fitting can be covered in a watertight manner. The radial gate support structure according to any one of claims 7 to 10,
A support structure for a radial gate, wherein the embedded metal fittings are arranged in parallel so that the door temporary stage can hold the door at a predetermined height higher than the water surface of the designed flood water volume.

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