JP5014202B2 - Temporary deadline box and installation method - Google Patents

Description

  The present invention relates to a temporary closing work box used when repairing a pier constructed underwater or the like in the same dry work space as the land, and an installation method thereof.

In recent years, maintenance, inspection, repair and reinforcement of bridge piers constructed in water such as rivers have become urgent. As shown in FIGS. 9 (1) and (2), these operations are performed by installing a temporary closing work box 33 so as to surround the pier 32, and then discharging the water inside the temporary closing work box 33 to land The same dry work space 34 was formed. As shown in FIG. 9 (3), the water stoppage between the temporary closing work box 33 and the pier 32 for forming the work space 34 is performed by connecting the water stop tube 35 to the temporary closing work box 33, the pier 32, and the like. It was set up in between. Further, as another temporary closing work box, there is an invention of JP-A-2006-249585.
Japanese Patent Laid-Open No. 2006-249585

  However, since the above-mentioned temporary closing work box has stopped water by pressing the water stop tube with water pressure, it is necessary to always manage the water pressure, and when the water depth is deep, sufficient water stopping ability cannot be secured. There was a point.

  This invention is made | formed in view of the above problems, and the objective is to provide the temporary closing work box which can ensure the management of water pressure, and sufficient water stop capability, and its installation method.

A temporary closing work box for solving the above problems is a temporary closing work box in which a pair of assembly units are joined in a state of facing each other and formed into a planar ring shape, and a fitting recess is formed at the bottom of the assembly unit. A plate-like water-proof packing is installed on the front wall of the fitting recess, the water-proof packing is bent downward with the bent portion on the upper side, and the bent piece is bent from the bottom. It is characterized by being pressed down by a pressing plate. It also includes that the bent piece is formed thicker than the other parts. In addition, a stopper is provided on the lower part of the inner surface of the assembly unit, and the stopper includes a temporary closing work box that is installed at a predetermined height so as to have an appropriate gap with the work object.
In addition, the temporary closing box is installed in a state where a pair of assembly units face each other and are formed into a planar ring shape, a fitting recess is formed at the bottom of the assembly unit, and a front wall of the fitting recess is formed. The plate-shaped water-stopping packing is installed, the water-stopping packing is bent downward with the bent part up, and the bent piece is pressed by a pressing plate from the bottom. And surrounding the work object in water with the temporary deadline work box, and lowering the temporary deadline work box and fixing it with an appropriate gap between the front wall of the fitting recess and the work object After that, the holding plate is removed and a part of the bent piece is brought into contact with the side surface of the work object by the repulsive force to close the gap, and then the water inside the temporary closing work box is drained and stopped. Water pressure is applied from the lower side of the water packing. It also includes that the bent piece is formed thicker than the other parts. Further, a stopper protrudes from the inner surface lower portion of the assembly unit, and the stopper includes that the temporary closing work box is installed at a predetermined height so as to have an appropriate gap portion with the work object.

  With the plate-shaped water-stopping packing installed on the front wall of the fitting recess at the bottom of the assembly unit, water-stopping that does not require water pressure management can be performed. Further, since the bent piece is formed thicker than the other parts, the bent piece comes out from the gap when the bent piece is brought into contact with the side surface of the work object to close the gap. Can be prevented. In addition, since the stopper is projected at the lower part of the inner surface of the assembly unit, the temporary closing work box is set at a predetermined height so that a gap can be appropriately formed between the front wall of the fitting recess and the work object. be able to. Also, remove the holding plate from the bent piece of the water-stopping packing, close the gap by bringing a part of the bent piece into contact with the side of the work object by the repulsive force of the bent piece, and When the water is drained, the water stopping capability is improved because water pressure acts on the water stopping packing from below.

  Hereinafter, embodiments of a temporary closing box and its installation method according to the present invention will be described in detail with reference to the drawings. First, the provisional deadline work box will be explained, and then the installation method of the temporary deadline work box will be explained. In each embodiment, the same components are described with the same reference numerals, and only different components are given different reference numerals. To explain. This temporary deadline work box surrounds work objects built underwater, such as piers, and after fitting the bottom part to the work objects and stopping water, draining the inner water, the same work space as on land Is formed.

  1 to 3 show an embodiment of a temporary closing work box 1. The temporary closing work box 1 is configured by forming a planar rectangular annular body having a U-shaped assembly unit 2 facing each other and joined together so that the upper part is opened.

  This assembly unit 2 is constructed by vertically joining a U-shaped hollow unit 5 and a lower unit 6 each having a back surface portion 3 and projecting portions 4 protruding on both sides of the back surface portion 3. Each of these units 5 and 6 is provided with a float tank (not shown), and is provided with an inlet / outlet (not shown) for pouring and draining ballast water into the float tank.

  In addition, when a waterproof seal 7 is installed on the upper and lower joint surfaces of the units 5 and 6 and the joint surface of the projecting portion 4, and the assembly unit 2 is joined with the joint bolt 8 to form the temporary closing work box 1. , To prevent water from entering the interior.

  A hollow bottom portion 9 is provided in the lower unit 6 of the assembly unit 2, and a flat semicircular fitting recess 10 that is fitted to the footing of the pier is formed in the bottom portion 9, and the front wall of the fitting recess 10 is formed. 11 is provided with a water-stop packing 12. The bottom portion 9 may not be hollow, and the fitting recess 10 is not limited to a flat semicircular shape, and may be a flat rectangular shape or a rectangular shape.

  As shown in FIG. 2 (2), the water-stopping packing 12 is formed by connecting a hard rubber plate 12b via a soft material 12a, and one of them is attached to the front wall 11 for mounting angle (or bolt). 13, and the other bent piece 14 is in a half-folded state in which the bent portion 15 is positioned on the upper side and is bent downward. The bent piece 14 is always pressed upward by a repulsive force (elasticity) of the hard rubber (leftward in the drawing), and is therefore pressed by a pressing plate 16 extending downward from the bottom upper surface. The pressing plate 16 is installed at appropriate intervals, and a horizontal fixing piece 17 is bolted to the flange piece 18. Accordingly, when all of the pressing plate 16 is removed, the bent piece 14 is rotated upward.

  Further, the flange 18 on the upper surface of the bottom covers the bent portion 15, and the water-stopping packing 12 is stored in the storage portion 19 formed by the flange 18 and the front wall 11, and the storage is pressed by the pressing plate 16. It has been. Since the water-stop packing 12 is formed in a semicircular shape for each assembly unit 2, when the assembly unit 2 faces and is joined to each other, it forms a planar circular ring shape, which corresponds to deformation in the extension direction. In addition, if the fitting recessed part 10 becomes a plane rectangle, as shown to (3) of FIG. 2, the water stop packing 12 will also become a rectangle. In addition, foamed rubber can be provided outside the bent piece 15.

  The reason why the bent piece 14 of the water-stopping packing 12 is thicker than the other is that the bent piece 14 comes out of the gap when the bent piece 14 is brought into contact with the side surface of the work object to close the gap. Is to prevent.

  In addition, on the upper side of the bottom portion 9 on the inner surface of the assembly unit 2, a stopper 20 extending inwardly projects from the opposing surface of the assembly unit 2, that is, the inner surface central portion of the assembly unit 2 and near the joint portion. This stopper 20 is installed on the work object so that the assembly unit 2 does not sink more than a certain amount, and an appropriate gap, that is, a water-stop packing 12 is fitted between the front wall of the fitting recess 10 and the work object. It is installed on the upper surface of the footing so that a gap portion can be formed. The assembly unit 2 can be fixed to the work object by means other than the stopper 20 described above.

  Next, the installation method of said temporary deadline work box is demonstrated based on FIGS. The work object on which the temporary closing work box 1 is installed is the pier 21 constructed underwater, and the footing 22 is a plane circle.

  First, two assembly units 2 in which a plurality of hollow units 5 and a lower unit 6 are joined together on the land are assembled and formed. Then, these assembly units 2 are carried on the carriage 23 one by one and transported to the site.

  Next, the assembly unit 2 is lifted by the crane 24, lowered from the carriage 23 into the water 25 and floated, and then the pier 21 is sandwiched with the concave portions facing each other. Then, when the projecting portions 4 of the assembly unit are brought into contact with each other and joined with the joining bolt 8, as shown in FIG. 4, the planar rectangular (or rectangular) temporary closing work box 1 having an open upper portion surrounds the pier 21. The joint is formed and water is stopped by a water-stop packing 7.

  Next, ballast water is poured into the float tank in each assembly unit 2 from the drainage port, and the temporary closing work box 1 is lowered. When the temporary closing work box 1 is lowered, as shown in FIG. 5, a stopper 20 projecting from the inner surface of each assembly unit 2 is installed on the upper surface of the footing 22, and the fitting recess 10 and the footing 22 on the bottom portion 9. A gap portion 26 is formed over the entire circumference between which the waterstop packing 12 is fitted. The interval between the gap portions 26 is adjusted by a cut beam 27 installed between the bridge piers 21 so as to be uniform over the entire circumference.

  Next, as shown in FIG. 6, when the pressing plate 16 is removed by a diver, the bent piece 14 of the water-stopping packing 12 rotates upward due to the repulsive force, and a part thereof abuts against the side surface of the footing 22. As a result, the gap 26 is closed.

  Next, as shown in FIG. 7, a crane 24 and a diver on the carriage 23 construct a cut beam 27 between the temporary closing work box 1 and the pier 21, and install a lift prevention device 28. The temporary deadline work box 1 is fixed.

  Next, as shown in FIG. 8, when the water 29 inside the temporary closing work box 1 is drained to form a dry work space 30, the stop fitted in the gap 26 between the footing 22 and the front wall 11 is stopped. Water pressure acts on the water packing 12 from the lower side to deform the bent piece 14 into an inverted U shape and press it against the footing 22, so that the gap 26 is closed and the water is stopped. Further, since the bent piece 14 is made thicker than the others, it can be prevented from coming out of the gap portion 26.

(1) is a sectional view of a temporary closing work box, and (2) is a front view thereof. (1) is sectional drawing of the principal part of a temporary closing work box, (2) and (3) are top views of a water stop packing. It is sectional drawing of a bottom part and a water stop packing. (1) is a plan view of installing a temporary closing work box on a pier, and (2) is a front view of the same. It is sectional drawing of the principal part which installed the temporary deadline work box in the pier. It is sectional drawing which fitted the water stop packing to the gap | interval part. It is the top view which fixed the temporary closing work box to the bridge pier. (1) is sectional drawing which drained the water inside a temporary closing work box, (2) is sectional drawing of the principal part. (1) is a longitudinal sectional view of a conventional temporary closing work box, (2) is a sectional view in the lateral direction, and (3) is a sectional view of a water stop tube.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 33 Temporary cut-off work box 2 Assembly unit 3 Back surface part 4 Protrusion part 5 Hollow unit 6 Lower unit 7 Packing 8 Joint bolt 9 Bottom part 10 Fitting recessed part 11 Front wall 12 Water stop packing 12a Soft material 12b Plate body 13 Mounting angle 15 Bending piece 16 Bending portion 17 Fixed piece 18 Fence piece 19 Storage portion 20 Stopper 21, 32 Bridge pier 22 Footing 23 Base boat 24 Crane 25 Underwater 26 Gap portion 27 Cross beam 28 Lifting prevention device 29 Inside the temporary closing work box Water 30, 34 Work space 35 Water stop tube

Claims (4)

  In the temporary closing work box formed by joining a pair of assembly units facing each other to form a flat ring shape, a fitting recess is formed at the bottom of the assembly unit, and a plate-like wall is formed on the front wall of the fitting recess. A water-stopping packing is installed, the water-stopping packing is bent downward with the bent portion positioned on the upper side, and the bent piece is pressed by a pressing plate from the bottom. Temporary deadline work box.   The temporary closing operation box according to claim 1, wherein the bent piece is formed to be thicker than other portions.   A stopper is projected from the lower part of the inner surface of the assembly unit, and the stopper is installed at a predetermined height so that the temporary cutoff work box has an appropriate gap between the work unit and the work object. Item 3. A temporary deadline work box according to item 1 or 2.   An underwater work object is surrounded by the temporary deadline work box according to any one of claims 1 to 3, and the temporary deadline work box is sunk to appropriately place a gap between the front wall of the fitting recess and the work object. After fixing the holding plate, remove the holding plate and bring the part into contact with the side of the work object by the repulsive force of the bent piece to close the gap, and then drain the water inside the temporary closing work box. A method for installing a temporary closing work box characterized by draining water pressure from below the water-stopping packing.

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