JP5424978B2 - Temporary deadline construction method and provisional deadline - Google Patents

Description

  The present invention relates to a provisional deadline as a structure installed on the surface of the upstream side (reservoir side) of a dam body during the redevelopment of a concrete dam.

  When redeveloping a dam while operating a concrete dam, it is known to provide a temporary deadline upstream of the dam as a countermeasure against floods. A method for constructing such a temporary deadline by, for example, stacking U-shaped members is known (see Patent Document 1). Moreover, the method of constructing a temporary deadline using a sheet pile is also known (see Patent Document 2).

JP 2000-336631 A JP-A-9-88044

However, in the method of building a temporary deadline by stacking U-shaped members, U-shaped members with dimensions that match the width dimensions of the construction target part are required, and each dimension corresponds to the size of the construction target part. Different U-shaped members must be prepared. In addition, when a U-shaped member having a large lateral width is used, it is difficult in terms of cost and structure to increase the strength of the U-shaped member. Even if the strength of the U-shaped member can be increased, the weight and size of the U-shaped member will increase, so handling of the U-shaped member will be difficult, and large heavy machinery will be required. At the dam site, there is often no space to install large heavy machinery and large heavy machinery cannot be used. That is, in the method of building the temporary deadline by stacking the U-shaped members, there is a problem in cost, workability, etc., when building the temporary deadline corresponding to the construction target part having a long width.
In addition, in the method of building a temporary deadline by building sheet piles, etc., in the bottom of the reservoir, work to build sheet piles, etc., work to construct a water barrier by placing concrete inside the sheet piles, etc. It requires laborious work such as removal of sheet piles in water and the like, and difficult work in water, which is difficult in terms of cost and workability.
The present invention provides a provisional deadline construction method and provisional deadline that can be easily coped with even when the construction target portion is wide and is excellent in cost and workability.

The temporary deadline construction method according to the present invention blocks water intrusion from the upstream side of the dam body between the upstream surface of the dam body (the upstream surface of the dam body) during the redevelopment of the concrete dam. A method for constructing a temporary deadline to form a water blocking space, which is arranged in a lateral direction so that cantilever members that are opposed to the surface with a space and extend in the vertical direction and whose lower end portion is fixed to the surface are arranged in the horizontal direction. Since the water blocking space is formed by installing multiple in the space, even if the construction target part is wide sideways, it can be easily handled by increasing the number of cantilever members used, and it is a temporary deadline with excellent cost and workability. A construction method can be provided.
The provisional deadline according to the present invention is a provisional deadline that forms a water blocking space for blocking water intrusion from the upstream side of the levee body between the upstream surface of the dam body during the redevelopment work of the concrete dam. The water blocking space is formed by providing a plurality of cantilever members that are opposed to the surface with a gap and that extend in the vertical direction and have a lower end fixed to the surface so as to be arranged in the horizontal direction. The opposing wall, the floor provided to block between the lower end side of the opposing wall and the surface, and the left wall provided to block between the left side of the opposing wall and the surface to the floor Part and the right wall part of the opposite wall part and the right wall part so as to close the space between the surface and the floor part. Can provide a temporary deadline with excellent workability and workability.
Watertight performance members are provided between the floor and the surface, between the left wall and the surface, and between the right wall and the surface, preventing water from entering the water blocking space more effectively. Can provide a temporary deadline.
Since the opposing wall portion is composed of a plurality of cantilever members provided so as to be arranged at intervals in the lateral direction, and a wall member provided so as to block between adjacent cantilever members, The number of cantilever members used can be reduced, and the cost of temporary closing can be reduced.
Since the cantilever member is fixed to the surface at a plurality of fixed positions spaced at the top and bottom at the lower end, it can relieve stress concentration on the levee body, and the cantilever member is stably fixed and has a stable structure. Can provide a temporary deadline.

The perspective view which shows the external appearance of the temporary deadline installed in the dam body. The figure which shows the longitudinal cross-section of the temporary deadline installed in the dam body (the AA cross-section equivalent figure of FIG. 1). The disassembled perspective view which decomposes | disassembles and shows a temporary deadline. The perspective view which isolate | separates and shows the cantilever member and the member attached to a cantilever member. The perspective view which looked at the joining relationship of a cantilever member, a wall member, and a floor board from the water blocking space side. The perspective view which looked at the joining relationship of a cantilever member, a wall member, and a floor board from the outer side. The figure which shows the construction of a floor part. The figure which shows construction of an opposing wall part.

  As shown in FIG. 1, during the redevelopment of the concrete dam 50, the surface (hereinafter referred to as the upstream surface of the dam body) 52 on the upstream side (reservoir 54 (see FIG. 2) side) of the concrete dam body 51. The provisional deadline 1 that forms a water blocking space 53 that blocks water intrusion from the upstream side of the dam body 51 between them creates, for example, an overflow section (weir) in the dam body 51 while operating the concrete dam 50. In order to protect the construction target part from flooding during construction, such as when making a gate in the levee body 51, or when making a water intake in the dam body 51 for taking drinking water or water for use in a power plant, etc. This is a temporary structure installed on the upstream surface 52 of the dam body in order to prevent damage in the downstream area of the dam due to overflow from the construction target part.

The water blocking space 53 is defined by being surrounded by the dam body upstream surface 52 and the temporary cutoff 1. That is, the water blocking space 53 includes the dam body upstream surface 52, the opposing wall portion 2 of the temporary cutoff 1 formed to face the dam body upstream surface 52, and the left wall portion 3 of the temporary cutoff 1. These are formed by a rectangular space which is closed by a five-sided block surrounded by the right wall portion 4 of the temporary deadline 1 and the floor portion 5 of the temporary deadline 1.
The opposing wall part 2, the left wall part 3, the right wall part 4, and the floor part 5 are formed of a metal material such as a steel material, for example.

The opposing wall portion 2 of the temporary cut-off 1 closes a space between a plurality of cantilever members 6 fixed to the dam body upstream surface 52 so as to form a cantilever and the adjacent cantilever members 6; And a plurality of wall members 7 provided on the wall.
The cantilever member 6 includes a vertical member 10, a support beam portion 11 and an attachment portion 12 provided at the lower end portion 8 of the vertical member 10.
The lower end portion 8 of the cantilever member 6 extends so that the vertical member 10 extends in the vertical direction and faces the upstream surface 52 of the bank body with an interval (for example, about several tens cm to several m). It is fixed to the dam body upstream surface 52. The plurality of cantilever members 6 are arranged so as to be arranged at intervals (for example, about several tens of centimeters) in the lateral direction of the dam body upstream surface 52.

The support beam portion 11 includes, for example, an end support beam 11A provided on a side closer to one end of the vertical member 10 at one end portion of the vertical member 10 extending straight, and closer to the center side of the vertical member 10 than the end support beam 11A. And a support beam 11B closer to the center provided at the position. One end of the end support beam 11A and one side surface of the vertical member 10 are connected to each other by connection means such as welding, and one end of the center support beam 11B and one side surface of the vertical member 10 are connected to each other by connection means such as welding. Is done.
The end support beam 11 </ b> A and the center support beam 11 </ b> B are provided so as to extend in the same direction perpendicular to the extension direction of the vertical member 10 from one side surface of the vertical member 10.

The attachment portion 12 includes an attachment reinforcing member 15 and an attachment plate 16.
The attachment reinforcing member 15 is formed of a vertical member that connects the other end of the end support beam 11A and the other end of the center support beam 11B.
The attachment plate 16 is provided on one end side and the other end side of the attachment reinforcing member 15. The two mounting plates 16; 16 form two fixed positions spaced apart from each other at the lower end portion 8 of the cantilever member 6, and the cantilever member 6 has the two mounting plates 16; 16 is fixed to the dam body upstream surface 52 through 16. One mounting plate 16 is provided on an extension line of the end support beam 11A, and the other mounting plate 16 is provided on an extension line of the center support beam 11B. In this way, the cantilever member 6 is fixed to the dam body upstream surface 52 at two fixed positions separated by the two mounting plates 16; 16 above and below the dam body upstream surface 52. Since the stress concentration can be alleviated and the mounting plate 16 is provided on the extension line of the support beams 11A and 11B, the cantilever member 6 is stably fixed to the surface 52 on the upstream side of the dam body, so that the temporary structure is stable. Deadline 1 can be obtained.

The vertical member 10, the support beam portion 11, and the attachment reinforcing member 15 of the cantilever member 6 are formed of a shape steel such as an H-shaped steel or an I-shaped steel, for example. Specifically, for example, as shown in FIG. 4, the surface of the flange of the H-section steel constituting the longitudinal member 10 and the surface of the flange of the H-section steel constituting the support beam 11 </ b>A; 11 </ b> B are orthogonal to each other. The surface of one flange of the H-shaped steel constituting the vertical member 10 and the H-shaped end edge surface of the H-shaped steel constituting the supporting beams 11A and 11B are connected by a connecting means such as welding. Further, the H-shaped steel of the H-shaped steel constituting the mounting reinforcing member 15 is so arranged that the surface of the H-shaped steel flange constituting the mounting reinforcing member 15 and the surface of the H-shaped steel flange constituting the support beams 11A; The other flange face and the H-shaped other end face of the H-section steel constituting the support beams 11A and 11B are connected by a connecting means such as welding.
For example, the vertical member 10 has a length of 8 m, the support beam portion 11 has a length of 1.2 m, and the attachment reinforcing member 15 has a length of about 3 m.

  For example, as shown in FIG. 1, the mounting plate 16 is a flat plate made of metal or the like that is fixed to the mounting reinforcing member 15 so that the other plate surface can come into surface contact with the upstream surface 52 of the bank body 51. It is formed. The attachment reinforcing member 15 and the attachment plate 16 are fixed by connecting means such as welding so that the other plate surface of the attachment plate 16 and the surface of one flange of the H-shaped steel constituting the attachment reinforcement member 15 are in contact with each other. The As the mounting plate 16, for example, a rectangular flat plate whose one side is longer than the lateral width of the flange surface of the mounting reinforcing member 15 is used, and this rectangular flat plate straddles between the left and right side edges of the flange surface. The rectangular flat plate is attached so that the left and right side edges protrude left and right from the positions of the left and right side edges of the flange surface. Thereby, fixation of the attachment plate 16 with respect to the bank body upstream surface 52 can be performed stably. It is preferable to provide a reinforcing plate 17 for reinforcing the mounting plate 16 on the mounting reinforcing member 15.

That is, in the cantilever member 6, the vertical member 10 extends in the vertical direction of the dam body upstream surface 52 with one end portion (end portion serving as the lower end portion 8) provided with the support beam portion 11 facing down. In addition, the surfaces of the flanges of the supporting beams 11A and 11B are horizontal so that the surface of one flange of the longitudinal member 10 and the upstream surface 52 of the bank body face each other with a space therebetween. In this state, the fixing plate 16; 16 and the anchor bolt 18 and the nut 19 are fixed to the dam body upstream surface 52 by a fixture (see FIG. 2).
For example, an anchor bolt 18 such as a chemical anchor is fixed at a predetermined position on the dam body upstream surface 52 of the dam body 51, and the anchor bolt 18 is projected from the dam body upstream surface 52, and formed on the mounting plate 16. The fixing plate 16; 16 of the cantilever member 6 is fixed to the dam body upstream surface 52 by fastening the nut 19 to the anchor bolt 18 through the anchor bolt 18 through the bolt through hole 20. It should be noted that the installation work of the anchor bolt 18 and the fixing work of the cantilever member 6 are performed with a temporary scaffold.
That is, the cantilever member 6 is attached to the dam body upstream surface 52 so as to form a cantilever having a lower end 8 as a fixed end and an upper end as a free end.

  As shown in FIG. 7, the floor portion 5 of the temporary cutoff 1 is a surface of a flange on the upper side of each central support beam 11 </ b> B so as to block between the central support beams 11 </ b> B: 11 </ b> B of adjacent cantilever members 6; Provided on top. That is, the floor part 5 provided so that the space | interval between the lower end side of the opposing wall part 2 and the dam body upstream surface 52 may be comprised using several rectangular plate-shaped floor boards 5A. The floor plate 5A has, for example, a dimension a of a pair of sides of a rectangle such that the center lines of the flange surfaces of the cantilever members 6; The dimension of the other pair of sides of the rectangle is formed in a dimension corresponding to the length between the bank body upstream surface 52 and one flange of the vertical member 10 facing the bank body upstream surface 52 in parallel. A rectangular plate having a dimension corresponding to the length between the surfaces is used. And the vertical member 10 of the several cantilever members 6 is attached so that the floor board 5A may be spanned on the surface of the flange of each center supporting beam 11B; 11B of adjacent cantilever members 6; 6. The floor portion 5 is formed between the dam body upstream surface 52 and a space where the dam body upstream surface 52 and the vertical members 10 of the plurality of cantilever members 6 face each other is provided above the floor portion 5. In addition, the floor board 5A located at the left and right ends of the floor part 5 uses a floor board having a dimension a larger than the floor board 5A located on the center side of the floor part 5. And it is comprised so that the left end surface of floor board 5A located in the left end part of the floor part 5 and the side end surface of one flange of the vertical member 10 located in the left end may be located on the same plane, and the right end of the floor part 5 The right end surface of the floor plate 5A positioned at the portion and the side end surface of one flange of the vertical member 10 positioned at the right end are configured to be positioned on the same plane.

  An angle member 25 is attached along the one end edge of the floor portion 5 by a fixing tool, welding, or the like not shown in the drawing on the plate surface on the one end edge surface side along the dam body upstream surface 52 in the floor portion 5. The angle member 25 has a configuration in which a cross section perpendicular to the longitudinal direction is formed in an L shape by processing a long plate member in one direction. And between the dam body upstream surface 52 and the angle member 25, a watertight performance member 26 such as a water swelling rubber that expands when water is absorbed is fitted (see FIG. 2; FIG. 5 and the like). ). Thereby, the watertight performance between the floor 5 and the dam body upstream surface 52 is maintained. In addition, when the unevenness | corrugation of the dam body upstream surface 52 is large and the clearance gap between the dam body upstream surface 52 and the angle member 25 becomes large, the watertight performance member 26 like foaming rubber is engage | inserted in the said clearance gap. Provided.

  An angle member 27 is also attached along the other end edge of the floor portion 5 by a fixing tool or welding not shown in the figure on the plate surface on the other end edge surface side facing the one end edge of the floor portion 5. Then, the angle member 27 and one flange of the vertical member 10 are connected by connecting means such as welding or mounting screws.

  The floor portion 5 is used as a floor when assembling a work scaffold for attaching the wall member 7 between the vertical members 10; 10 adjacent to each other, and the space above the floor portion 5 is adjacent to the vertical members 10; 10 adjacent to each other. It is used as a work space 29 when the wall member 7 is mounted therebetween.

  As shown in FIG. 8, the wall member 7 is attached by, for example, suspending the wall member 7 from above the dam body 51 with a crane or the like and positioning it between the adjacent vertical members 10; The worker who performs the work connects the wall member 7 to the vertical members 10; For example, as shown in FIG. 4, screw holes 30 that penetrate the plate surface are formed on the left and right edge sides of the wall member 7, and the flange plate surface penetrates one flange of an H-shaped steel as a vertical member. Bolt through holes 31 to be formed are formed. Then, one plate surface on the left and right side edges of the wall member 7 (the plate surface opposite to the other plate surface to which a reinforcing bar 36 described later is attached) and the dam body upstream surface 52 side of the vertical member 10 In a state where the web side surface (flange inner surface) of one of the flanges located on the flange is faced, the screw hole 30 of the wall member 7 and the bolt through hole 31 of the vertical member 10 are aligned so that the worker can work in the work space. The vertical member 10 and the wall member 7 are connected by fastening the bolt 32 from the 29 side to the screw hole 30 through the bolt through hole 31. In this way, the opposing wall portion 2 composed of the vertical member 10 and the wall member 7 is formed.

Between one flange and the other flange of the vertical member 10, a reinforcing plate 35 is located on the same plane as the flanges of the support beams 11A and 11B and connects the one flange and the other flange of the vertical member 10 to each other. Is provided by connecting means such as welding.
Since the lower end of the wall member 7 is provided so as to abut against the surface of the reinforcing plate 35 provided so as to be positioned on the same plane as the flange of the central support beam 11B on which the floor plate 5A is placed, Since a gap corresponding to the thickness of one flange of the vertical member 10 is formed between the angle member 27 of the portion 5 and one surface of the lowermost end portion of the wall member 7, the above-described water swelling is also generated in this gap. A watertight performance member 26 such as rubber or foam rubber is fitted and provided (see FIG. 2).

The left wall portion 3 of the temporary deadline 1 closes the space between the left side portion of the cantilever member 6 located at the left end constituting the left side portion of the opposing wall portion, the left end portion of the floor portion 5, and the dam body upstream surface 52. It is formed by the left wall plate 3A.
The right wall portion 4 of the temporary cutoff 1 closes the space between the right side portion of the cantilever member 6 positioned at the right end constituting the left side portion of the opposing wall portion, the right end portion of the floor portion 5 and the dam body upstream surface 52. It is formed by the right wall plate 4A.

The left wall plate 3A can be attached by, for example, the left end of the floor plate 5A located on one plate surface opposite to the other plate surface provided with the reinforcing bar 36 of the left wall plate 3A and the left end portion of the floor portion 5. The left wall plate in a state where the left end surface of one flange of the vertical member 10 located at the surface and the left end is abutted and one side end surface of the left wall plate 3A and the dam body upstream surface 52 face each other. The plate surface on the other side end surface side of 3A and the flange of the vertical member 10 located at the left end are connected using an angle member 37, and the plate surface on the lower end side of the left wall plate 3A and the floor portion 5 are connected to the angle member 37. Are connected using an angle material outside the figure similar to the above, and an angle material outside the figure similar to the above is provided along the one side edge on the plate surface on one side edge side of the left wall plate 3A. A watertight performance member such as the above-mentioned water-swelling rubber or foamed rubber is fitted between the material and the dam body upstream surface 52. Nde provided. The right wall plate 4A is also mounted in the same manner as the left wall plate 3A.
As the wall member 7, the left wall plate 3 </ b> A, and the right wall plate 4 </ b> A, for example, a configuration in which a reinforcing bar 36 is provided on the other surface of the flat plate material is used. Further, the wall portion formed by the wall member 7, the left wall plate 3 </ b> A, and the right wall plate 4 </ b> A may be composed of a plurality of plate materials provided so as to be continuous in the vertical direction, as shown in each drawing, You may be comprised with the board material of 1 sheet extended up and down.

As described above, a rectangular water blocking space 53 having an open top and a five-sided block surrounded by the opposing wall portion 2, the left wall portion 3, the right wall portion 4, and the floor portion 5 is formed.
That is, at least the gap between the undulating upstream surface 52 and the left wall 3, the unevenness between the undulating upstream surface 52 and the left wall 3, and the upstream dam body upstream Since the watertight performance member 26 is fitted and provided in the gap between the surface 52 and the floor portion 5 and the gap between the wall member 7 and the floor portion 5, the water blocking space 53 in which the watertight performance is maintained is formed. . In addition, between the left wall part 3 and the opposing wall part 2, between the left wall part 3 and the floor part 5, between the right wall part 4 and the opposing wall part 2, and between the right wall part 4 and the floor part 5. In the meantime, a watertight performance member 26 is provided to improve the watertight performance.

  And the connection reinforcement which connects the outer surface of the other flange of the some vertical member 10 attached so that it might mutually adjoin is attached. For example, the lower connection reinforcing member 38 is provided so as to be positioned on the same plane as the central support beam 11B, the upper connection reinforcing member 39 for connecting the upper end side of the vertical member 10 is provided, and the connection reinforcing member is provided. A brace connecting reinforcing member 40 is provided for connecting the connecting member 38 and the connecting reinforcing member 39.

  Thus, the temporary deadline 1 is constructed. Thereby, it is possible to prevent water from the upstream side from entering the construction target portion during the construction of creating a overflow portion or the like by destroying a part of the dam body 51 facing the opposing wall portion 2 of the temporary cutoff 1.

According to the first embodiment, the cantilever member 6 that is opposed to the dam body upstream surface 52 with an interval and extends in the vertical direction and whose lower end portion 8 is fixed to the dam body upstream surface 52 is disposed in the lateral direction. Since a plurality of water blocking spaces 53 are formed so as to be arranged at intervals, even when the construction target portion is wide horizontally, it can be easily dealt with by increasing the number of cantilever members 6 used. Further, since the cantilever member 6 is combined, the cantilever member 6 can be miniaturized and the cantilever member 6 can be easily handled. Therefore, the construction method of the temporary deadline 1 and the temporary deadline 1 excellent in cost and workability can be provided.
Further, since the watertight performance member 26 for improving the watertight performance is provided between the floor portion 5 and the left and right wall portions 3; 4 and the dam body upstream surface 52, the watertight performance can be sufficiently maintained, and the water blocking space 53 is provided. Water can be effectively prevented from entering.
In addition, since the angle member is provided on the member facing the dam body upstream surface 52 to increase the space where the watertight performance member 26 can be installed, the watertight performance can be further improved.
Moreover, the opposing wall part 2 is provided with a plurality of cantilever members 6 provided so as to be arranged at intervals in the lateral direction, and a plurality of wall members 7 provided so as to block between adjacent cantilever members 6. Therefore, the number of cantilever members 6 used can be reduced and the cost can be reduced. Moreover, the cantilever member 6 can be reduced in size, and the handling of the cantilever member 6 becomes easy. Therefore, the temporary deadline 1 excellent in cost and workability can be obtained.
Further, the cantilever member 6 is fixed to the dam body upstream surface 52 at two fixed positions via the two attachment plates 16; The stress concentration can be alleviated, and the cantilever member 6 can be stably fixed, so that the temporary cutoff 1 having a stable structure can be obtained.
Moreover, cost can be reduced by using the cantilever member 6 formed by combining ready-made shaped steel.

In addition, without using the wall member 7, when the side end surfaces of one flange of the adjacent cantilever members 6; It is good also as the temporary cutoff 1 of the structure formed by one flange of the vertical member 10 of this cantilever member 6.
Further, the length of the vertical member 10 of the cantilever member 6, the spacing between the support beams 11A and 11B, the number of mounting plates 16 provided on the cantilever member 6, and the spacing between the mounting plates 16 and 16 are particularly limited. Not.

1 Temporary deadline 2 Opposite wall 3 Left wall 4 Right wall 5 Floor
6 cantilever member, 7 wall member, 8 lower end, 16 mounting plate (fixed position),
26 Watertight performance members, 50 concrete dams, 51 dams,
52 Embankment upstream surface (upstream surface of embankment), 53 Water blocking space.

Claims (5)

A method for constructing a temporary deadline that forms a water blocking space for blocking water ingress from the upstream side of the levee body between the upstream surface of the dam body during the redevelopment of the concrete dam,
A plurality of cantilever members which are opposed to the surface with a gap and extend in the vertical direction and whose lower end portion is fixed to the surface are provided in a row so as to form a water blocking space. How to build a temporary deadline. A temporary cutoff that forms a water blocking space that blocks water from the upstream side of the dam body between the upstream surface of the dam body during the redevelopment of the concrete dam,
Opposite formed by providing a plurality of cantilever members, each having a water blocking space facing the surface at a distance and extending vertically and having a lower end fixed to the surface. A wall, a floor provided so as to block between the lower end side of the opposing wall and the surface, and a left provided so as to block between the left side of the opposing wall and the surface and the floor. A temporary cutoff comprising a wall portion, a right side portion of the opposing wall portion, and a right wall portion provided so as to block between the surface and the floor portion.   The watertight performance member is provided between the floor portion and the surface, between the left wall portion and the surface, and between the right wall portion and the surface. .   The opposing wall portion is constituted by a plurality of cantilever members provided so as to be arranged at intervals in the lateral direction, and a wall member provided so as to block between adjacent cantilever members. The provisional deadline according to claim 2.   3. The provisional deadline according to claim 2, wherein the cantilever member is fixed to the surface at a plurality of fixing positions spaced apart vertically at a lower end portion.

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