JP5866309B2 - Floating type temporary cut-off construction - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a floating prevention structure for a floating body type cutoff construction that is formed by installing a provisional cutoff structure that is constituted by a bottom portion and a side wall portion and that is open on a part of a side surface on a wall surface of a levee body.

  Conventionally, when underwater objects such as dams are constructed from the underwater side, a temporary closing structure is installed on the object, and the space surrounded by the object and the temporary closing structure is drained to create a work space. May form.

  FIG. 8 is a side view of the temporary cutoff structure 102. The temporary cutoff structure 102 is formed by installing the temporary cutoff structure 101 on the bank body 103 and installing the support frame 105 above the temporary cutoff structure 101. An anti-lifting material 107 is installed between the support frame 105 and the top end of the temporary cutoff structure 101. A suspended object 109 is installed between the support frame 105 and the bottom 111 of the temporary cut-off structure 101 (see, for example, Patent Document 1).

JP-A-2005-139865

  However, in the temporary cutoff structure, if the anti-lifting material 107 and the hanging object 109 are installed by a conventional method, the space above the temporary cutoff structure 1 cannot be effectively used.

  The present invention has been made in view of the above-described problems, and the object of the present invention is to provide a floating temporary structure that can be formed in a limited work space and can effectively utilize the space above the temporary cut-off structure. It is to provide a structure to prevent the lifting work from being lifted.

  In order to achieve the above-described object, the present invention provides a floating temporary cofferer that is formed by installing a temporary coffering structure, which is composed of a bottom part and a side wall part and is open on a part of its side surface, on a wall surface of a dam body. A lift prevention structure, the lift prevention anchor fixed to the wall surface of the levee body, a flange portion disposed between the lift prevention anchor and the top end of the temporary fastening structure, and the flange portion, A floating-type temporary fastening structure provided with a lifting prevention mechanism provided between the top end of the temporary fastening structure and a sliding plate that enables the temporary fastening structure to move horizontally. This is a structure to prevent the lifting.

  In the present invention, by disposing the collar portion between the lift prevention anchor and the top end of the temporary cutoff structure, the temporary cutoff structure can be prevented from rising when the water level rises. Further, by providing a sliding plate between the collar and the top end of the temporary cutoff structure, the horizontal movement of the uppermost block of the temporary cutoff structure is not constrained.

It is desirable that the ridge portion is disposed along the wall surface of the levee body, and the formation length of the ridge portion from the wall surface is shorter than the length from the wall surface to the floating center of the temporary cutoff structure.
Thereby, the space above the temporary cutoff structure can be effectively utilized.

In the present invention, a suspension member that connects the top end of the temporary cutoff structure and the anti-lift anchor may be further provided.
By providing the suspension member, the provisional cutoff structure can be prevented from sinking when the water level is lowered.

  ADVANTAGE OF THE INVENTION According to this invention, it can form in the limited work space and can provide the floating prevention structure of the floating-type temporary cutoff which can utilize the space above the temporary cutoff structure effectively.

The figure which shows the outline | summary of the temporary cutoff structure 1 The figure which shows the assembly method of the temporary cutoff structure 1 The figure which shows the detail of the connection structure 11 and the water stop structure 13 The figure which shows the outline of the rubber gasket 21 The figure which shows the attachment method of the rubber gasket 21 The figure which shows the outline of temporary cut-off structure 2 The figure which shows the details of temporary deadline structure 2 Side view of conventional temporary cut-off structure 102

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram showing an outline of a temporary cutoff structure 1. FIG. 1A is a front view of the temporary cutoff structure 1. FIG. 1B is a side view of the temporary cutoff structure 1. FIG.1 (b) is the figure seen from the direction of the arrow A shown to Fig.1 (a). FIG. 1C is a rear view of the temporary cutoff structure 1. FIG.1 (c) is the figure seen from the direction of the arrow C shown in FIG.1 (b). FIG. 1D is a horizontal cross-sectional view of the block 3 constituting the temporary cutoff structure 1. FIG.1 (d) is sectional drawing by the arrow BB shown to Fig.1 (a).

  As shown in FIG. 1A and FIG. 1B, the temporary cutoff structure 1 includes a bottom portion 5, a side wall portion 7, a movable lid 6, and the like. The side wall part 7 consists of a plurality of blocks 3 stacked one above the other. A water stop structure 13 is formed at the abutting portion between the lower block 3 and the upper block 3. Details of the water stop structure 13 will be described later. Further, the lower block 3 and the upper block 3 are connected by a connecting structure 11 that is connected so as to allow a predetermined amount of movement in the horizontal direction. Details of the connection structure 11 will be described later.

  As shown in FIG.1 (d), the temporary cutoff structure 1 is a shape by which a part of side surface was open | released. The block 3 constituting the temporary cutoff structure 1 is provided with a plurality of partitions 25 inside. The interior of the block 3 is divided into a plurality of spaces 23 by a partition 25.

  As shown in FIG. 1A and FIG. 1B, a pouring / draining valve 9 is provided in a block 3 having a predetermined number of lower steps among the blocks 3 constituting the temporary closing structure 1. The drainage valve 9 is arranged for each space 23 of the block 3.

  As shown in FIGS. 1A and 1B, the movable lid 6 is provided at the top end 18 of the temporary cutoff structure 1. The movable lid 6 is provided with a rotation support portion in the vicinity of the end portion 17 of the top end 18. The movable lid 6 is a flap-type lid that opens and closes as indicated by an arrow E.

  As shown in FIGS. 1 (c) and 1 (d), a wood 19, a U-shaped rubber gasket 21, and an end 17, which is a portion facing the wall surface of the bank body, of the temporary closing structure 1 The water stop structure 15 which consists of is formed. Details of the water stop structure 15 will be described later.

  FIG. 2 is a diagram illustrating an assembly method of the temporary cutoff structure 1. The temporary cutoff structure 1 shown in FIG. 1 is assembled, for example, between a base boat 27 and a base boat 29 floating on the water surface 37, as shown in FIG. On the carriage 27, a structure support frame 31 having a chain block 33 is installed. A crawler crane 35 is installed on the carriage 29.

  In order to assemble the temporary cut-off structure 1, first, the bottom block 3-1 is connected to the upper portion of the bottom portion 5 in a state where the bottom portion 5 is floated on the water surface 37, and is submerged to a predetermined depth. Thereafter, the operation of connecting the upper block 3 above the lower block 3 and sinking it to a predetermined depth is repeated a plurality of times until the connection of the n-stage block 3 is completed.

  FIG. 2A to FIG. 2C show a process of connecting the block 3-4 to the block 3-3. Hereinafter, a method of connecting the blocks 3 will be described using FIGS. 2A to 2C as an example of the blocks 3-3 and 3-4. In the step shown in FIG. 2A, the upper block 3-4 is suspended above the lower block 3-3 suspended by the chain block 33 using the crawler crane 35. And the lower block 3-3 and the upper block 3-4 are connected by the connection structure 11 (FIG. 1). Water is stopped between the lower block 3-3 and the upper block 3-4 by the water blocking structure 13 (FIG. 1).

  After connecting the lower block 3-3 and the upper block 3-4 in the step shown in FIG. 2A, the chain block 33 and the crawler crane 35 are simultaneously unwound in the step shown in FIG. 2B. . Then, the temporary cutoff structure 1 being assembled is lowered to a predetermined depth (position where the weight and the buoyancy including the ballast water weight are suspended).

  In the step shown in FIG. 2 (c), ballast water is injected into a predetermined space 23 (FIG. 1 (d)) in the lower blocks 3-1, 3-2,. The block 33 and the crawler crane 35 are simultaneously wound down. Then, the temporary cutoff structure 1 being assembled is lowered to a predetermined depth (position where the weight and the buoyancy including the ballast water weight are suspended), and the chain block 33 is changed from the block 3-3 to the block 3-4.

  FIG. 3 is a diagram illustrating details of the connection structure 11 and the water stop structure 13. Below, the connection structure 11 which connects the lower block 3 and the upper block 3 and the water stop structure 13 between the lower block 3 and the upper block 3 are demonstrated using FIG.

  FIG. 3A is a diagram showing a state before connection of the butted portions of the upper block 3 and the lower block 3. As shown in FIG. 3 (a), in the block 3, the connection hardware 41a is fixed to the upper side surface 43a and the inner side surface 43b of the temporary cutoff structure 1 above a predetermined distance 39a from the lower surface 45a. The In the block 3, the connecting hardware 41b is fixed below the upper surface 45b at a predetermined distance 39b. The connecting hardware 41a, 41b includes a horizontal connecting plate 42a and a vertical rib 41b.

  As shown in FIG. 3A, the block 3 is provided with a supporting plate 47 on the lower surface 45a and the upper surface 45b, respectively. The block 3 is provided with a watertight rubber 49 having a P-shaped cross section on the entire length of the lower edge portion of the outer side surface 43a of the temporary cutoff structure 1. The watertight rubber 49 is arranged such that a small amount of the P-shaped circular portion protrudes from the lower surface 45a of the block 3. The block 3 is provided with a rubber contact portion 51 along the entire length of the upper edge portion of the side surface 43a.

  FIG. 3B is a diagram illustrating a state after the connection of the butted portions of the upper block 3 and the lower block 3. As shown in FIG. 3 (b), the connection structure 11 has a bolt 53 inserted through a first connection metal 41 b provided in the lower block 3 and a second connection metal 41 a provided in the upper block 3. The bolt 53 is fixed at the position of the connecting plate 41a. In the connection structure 11, the first connection metal 41 b and the second connection metal 41 a are arranged at a predetermined interval, and the bolt 53 is disposed between the first connection metal 41 b and the second connection metal 41 a. It can be deformed. As a result, the lower block 3 and the upper block 3 are allowed to move by a predetermined amount in the horizontal direction.

  As shown in FIG. 3B, the water stop structure 13 is formed by contacting a circular portion of a P-type watertight rubber 49 while deforming it into a rubber contact portion 51. The bearing plate 47 on the lower surface 45a of the upper block 3 and the bearing plate 47 on the upper surface 45b of the lower block 3 are in contact with each other.

  FIG. 2 (d) is a diagram showing a process of attaching the rubber gasket 21 to the temporary cutoff structure 1 that has completed the connecting operation of the blocks 3. FIG. 4 is a diagram showing an outline of the rubber gasket 21, and FIG. 5 is a diagram showing a method for attaching the rubber gasket 21. Below, the outline | summary of the rubber gasket 21 and the attachment method to the temporary cutoff structure 1 are demonstrated using FIG.2 (d), FIG.4, FIG.5.

  4A is a cross-sectional view of the rubber gasket 21, and FIG. 4B is an elevation view of the rubber gasket 21. FIG. 4A is a cross-sectional view taken along the arrow FF shown in FIG. As shown in FIG. 4B, the rubber gasket 21 is U-shaped. As shown in FIG. 4A, the rubber gasket 21 includes a main body 21a and a fixing portion 21b. The main body 21a has a single nose 21c in the center of the upper surface. The compression amount 57 of the main body 21a is the nose height 55 + α of the nose 21c, and is preferably about 50 to 60 mm. The fixing portion 21b is provided so as to protrude in the direction of both sides from the lower surface of the main body 21a. The fixing portion 21 b has a hole 59.

  5A and 5B show a process of aligning the rubber gasket 21. FIG. FIG.5 (b) is sectional drawing by the arrow HH shown to Fig.5 (a). FIGS. 5C to 5E are views showing a state where the rubber gasket 21 is attached. FIG.5 (d) is sectional drawing by the arrow II shown in FIG.5 (c). FIG. 5E is an enlarged view of the range G shown in FIG.

  When assembling the temporary cut-off structure 1, all the blocks 3 are connected by the method described with reference to FIGS. 2A to 2C to form the side wall portion 7, and then FIG. As shown, the rubber gasket 21 is suspended in water using the crawler crane 35. The rubber gasket 21 is suspended from the end 17 side of the temporary cutoff structure 1. It is desirable to attach a balance weight 91 to the lower end of the rubber gasket 21 in order to maintain the shape and posture of the rubber gasket 21.

  As described above, the wood 19 is disposed at the end 17 of the temporary cutoff structure 1. As shown in FIG. 5A, the timber 19 is disposed on both sides of the end 17 of each block 3. A long bolt 61 is disposed between the timbers 19. Moreover, as shown in FIG.5 (b), the short volt | bolt 63 is also arrange | positioned. The long bolt 61 and the short bolt 63 are fixed to the block 3.

  The rubber gasket 21 suspended in water as shown in FIG. 2 (d) is aligned so that the hole 59 overlaps the tip of the long bolt 61 as shown in FIGS. 5 (a) and 5 (b). . And the long volt | bolt 61 is inserted in the hole 59, and the rubber gasket 21 is attached between the timbers 19 of each block 3 as shown in FIG.5 (c). The wood 19 is assumed to be thinner than the rubber gasket 21. When the long bolt 61 of the block 3 is inserted into the hole 59 of the rubber gasket 21, the positions of the remaining holes of the rubber gasket 21 and the short bolt 63 of the block 3 as shown in FIGS. 5 (d) and 5 (e). The rubber bolts 21 can be easily attached to the temporary fastening structure 1 by aligning and inserting the short bolts 63 into the remaining holes at the same time.

  FIG. 6 is a diagram showing an outline of the temporary cutoff structure 2. 6A is an elevation view of the temporary cutoff structure 2, FIG. 6B is a side view of the temporary cutoff structure 2, and FIG. 6C is a horizontal sectional view of the temporary cutoff structure 2. FIG. FIG.6 (c) is sectional drawing by the arrow LL shown in FIG.6 (b).

  FIG. 7 is a diagram illustrating details of the temporary cutoff structure 2. FIG. 7A is a front view of the lifting prevention mechanism 65. Fig.7 (a) is an enlarged view of the range J shown to Fig.6 (a). FIG. 7B is a side view of the lifting prevention mechanism 65. FIG. 7B is an enlarged view of the range K shown in FIG. FIG. 7C is a horizontal sectional view near the stopper 85. FIG.7 (c) is an enlarged view of the range M shown in FIG.6 (c).

  The temporary cutoff structure 2 is formed by draining the interior 89 surrounded by the temporary cutoff structure 1 and the wall surface 68 of the dam body 69 after the temporary cutoff structure 1 is installed on the dam body 69. As shown in FIG. 6, in the temporary cut-off structure 2, a door stop 67 is installed in a frame shape on the wall surface 68 of the bank body 69. As shown in FIG. 7C, the door stop 67 is fixed to the wall surface 68 of the dam body 69 using the anchor hardware 87a and the anchor hardware 87b. It is desirable to install the door stopper 67 on the wall surface 68 of the dam body 69 in parallel with the assembly of the temporary shut-off structure 1.

  In order to install the temporary cutoff structure 1 on the dam body 69, the temporary cutoff structure 1 assembled by the respective steps shown in FIG. 2 is floated in a standing state and towed to the vicinity of the planned installation position of the dam body 69. . Then, as shown in FIG. 6B, the end portion 17 of the temporary closing structure 1 is arranged in accordance with the door stop 67 of the wall surface 68 of the dam body 69. As shown in FIGS. 6A and 6B, a lifting prevention mechanism 65 is installed between the top end 18 of the temporary closing structure 1 and the wall surface 68 of the bank body 69. As shown in FIG. 6C, a stopper 85 is installed between the side wall portion 7 of the temporary cutoff structure 1 and the wall surface 68 of the bank body 69.

  As shown in FIGS. 7A and 7B, the lift prevention mechanism 65 is formed of a lift prevention anchor 73, a flange 71, a sliding plate 77, a suspension rod 75, and the like. The floating prevention anchor 73 is a plate-like member having a lattice-shaped reinforcing material 83. The lift prevention anchor 73 is fixed to the wall surface 68 of the dam body 69 by an anchor bolt 79. The collar portion 71 is disposed between the lower end surface 81 of the lifting prevention anchor 73 and the top end 18 of the temporary cutoff structure 1. The flange portion 71 is disposed along the wall surface 68 of the dam body 69, and the formation length 76 of the flange portion 71 from the wall surface 68 is a length 80 from the wall surface 68 to the floating center 78 of the temporary cutoff structure 1 (see FIG. 6 (b)). The sliding plate 77 is provided between the flange portion 71 and the top end 18 of the temporary cutoff structure 1. The flange 71 only needs to be in contact with the top end 18 of the temporary cutoff structure 1 via the sliding plate 77, and does not need to be connected to the top end 18. The suspension rod 75 connects the top end 18 of the temporary cutoff structure 1 and the lift prevention anchor 73. The end of the suspension rod 75 on the lift prevention anchor 73 side is connected to a reinforcing member 83, for example.

  In the lifting prevention mechanism 65, the flange portion 71 supports the buoyancy of the temporary cutoff structure 1 and prevents the lifting. As described above, the formation length 76 of the flange portion 71 is shorter than the length 80 from the wall surface 68 to the floating center 78 of the temporary cutoff structure 1, but the rotational moment generated in the temporary cutoff structure 1 is thereby caused by water pressure. Since it is canceled out, the temporary cut-off structure 1 will not be lifted (away from the wall). The sliding plate 77 enables the horizontal movement of the uppermost block 3 of the temporary cutoff structure 1. The hanging rod 75 prevents the temporary cutoff structure 1 from sinking when the water level drops abnormally.

  As shown in FIG. 7C, one end of the stopper 85 is connected to the side surface 43 b inside the side wall portion 7 of the temporary cutoff structure 1. The other end of the stopper 85 is connected to the anchor hardware 87a of 67 per door. The stopper 85 prevents the temporary cutoff structure 1 from separating from the dam body 69 due to earthquake motion or the like.

When the temporary cut-off structure 1 is installed on the wall surface 68 of the dam body 69, as shown in FIG. 7C, the rubber gasket 21 compressed and deformed to the same thickness as the wood 19 and the wood 19 contacts the door stop 67. Thus, the water stop structure 15 is formed. In the water stop structure 15, the wood 19 prevents the position of the temporary cutoff structure 1 from being displaced by friction with the door stop 67. Further, the rubber gasket 21 prevents water from moving between the inside and the outside of the temporary cutoff structure 1.

  In the temporary closing structure 2, the temporary closing structure 1 is installed on the wall surface 68 of the bank body 69 as shown in FIGS. 6 and 7, and then the movable lid 6 is installed on the top end 18. Then, the interior 89 surrounded by the temporary cutoff structure 1 and the wall surface 68 of the bank 69 is drained to complete the temporary cutoff.

  As described above, in the present embodiment, the provisional cutoff structure 1 formed by repeating the operation of connecting the upper block 3 above the lower block 3 and sinking it to a predetermined depth a plurality of times in an upright state. Towed after floating, and installed on the wall surface 68 of the embankment 69. Thereby, the temporary cutoff structure 1 can be assembled and the temporary cutoff structure 2 can be formed in a limited space on the water without performing a diving operation under a deep water condition.

  In the temporary cut-off structure 1, a rubber gasket 21 having a predetermined compression allowance is installed on the end portion 17 facing the wall surface 68 of the dam body 69 as a water-stopping member and having a U-shape matched to the end portion 17. . Even when the door stop 67 has unevenness, the rubber gasket 21 is compressed and deformed while following the unevenness, so that the water-stopping structure 15 between the end 17 of the temporary closing structure 1 and the door stop 67 is surely secured. You can do it.

  In the temporary cut-off structure 1, the butted portions of the lower block 3 and the upper block 3 are connected by a connection structure 11 that allows a predetermined amount of movement in the horizontal direction. Therefore, even when the door stop 67 is uneven, each block 3 can be horizontally moved independently to bring the wood 19 and the rubber gasket 21 into contact with the door stop 67.

  In the temporary cutoff structure 1, the watertight rubber 49 provided along the lower edge of the upper block 3 and the upper edge of the lower block 3 are provided at the abutting portion between the lower block 3 and the upper block 3. The water stop structure 13 is provided in which the rubber contact portion 51 is brought into contact with the watertight rubber 49 while being deformed. Thereby, the water-stopping property of the abutting part of the lower block 3 and the upper block 3 is ensured reliably.

  In the temporary cutoff structure 1, a flap-type movable lid 6 is provided at the top end 18. Thereby, it can prepare for the dam water level rise by abnormal water discharge.

  In the provisional cutoff structure 2, by installing the lifting prevention mechanism 65, the collar 71 of the lifting prevention mechanism 65 can prevent the provisional cutoff structure 1 from rising when the water level rises. The sliding plate 77 enables the horizontal movement of the uppermost block 3 of the temporary cutoff structure 1. The suspension rod 75 can prevent the temporary cutoff structure 1 from sinking when the water level is lowered.

  In addition, the horizontal cross-sectional shape of the temporary cutoff structure 1 is not restricted to what was shown in FIG.1 (d). The temporary cut-off structure 1 may be constituted by a bottom part and a side wall part composed of a plurality of blocks, and a part of the side face is opened. In addition, instead of the wood 19, steel materials may be disposed on both sides of the rubber gasket 21 of the water stop structure 15. In the suspension / lifting prevention mechanism 65, a suspension rope may be used instead of the suspension rod 75 as the suspension member.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

DESCRIPTION OF SYMBOLS 1 ......... Temporary cutoff structure 2 ......... Temporary cutoff structure 3 ......... Block 5 ......... Bottom part 6 ......... Moveable lid 7 ......... Side wall part 9 ......... Drainage valve 11 ......... Connection structure 13, 15 ......... Water stop structure 17 ......... End 18 ......... Top 19 ......... Wood 21 ...... Rubber gaskets 41a, 41b ......... Connecting hardware 42a, 42b ......... Connecting plate 43a, 43b ......... Side 45a ......... Lower surface 45b ......... Upper surface 49 ......... Watertight rubber 51 ...... Rubber contact part 53 ......... Bolt 55 ......... Nose height 57 ......... Compression amount 65 ......... Floating Prevention mechanism 67 ......... Per door 68 ......... Wall surface 69 ......... Bill body 71 ......... Bridge 73 ......... Anti-floating prevention anchor 75 ......... Hanging rod 76 ......... Formation length 77 ......... Slide plate 85 ......... Stopper 89 ... …… Inside

Claims (3)

It is a structure for preventing floating of a floating temporary cut-off work formed by installing a temporary cut-off structure formed of a bottom portion and a side wall portion on a wall surface of a levee body, wherein a part of the side surface is opened,
An anti-lift anchor anchored to the wall of the levee body,
A collar portion disposed between the anti-lift anchor and the top end of the temporary cutoff structure;
A sliding plate that is provided between the flange and the top end of the temporary cutoff structure, and that allows the horizontal movement of the temporary cutoff structure;
A floating prevention structure for a floating body type temporary cut-off, characterized in that a floating prevention mechanism is provided.   The flange is disposed along the wall surface of the levee body, and the formation length of the flange from the wall surface is shorter than the length from the wall surface to the floating center of the temporary cutoff structure. The floating prevention structure for a floating temporary cut-off according to claim 1.   The floating prevention structure for a floating-type temporary fastening construction according to claim 1 or 2, further comprising a suspension member that connects the top end of the temporary fastening structure body and the lift prevention anchor.

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