JP4509812B2 - Dry work box and installation method - Google Patents

Description

  The present invention relates to a dry work box and an installation method thereof.

The temporary closing method, which is carried out when performing seismic reinforcement of underwater bridge piers, etc., surrounds the underwater structure with steel sheet piles, etc., and then drains the inside to create the same dry work space as on land Is to make. As another temporary closing method, for example, there is an invention disclosed in Japanese Patent Laid-Open No. 2003-232044.
JP 2003-232044 A

  However, the temporary closing method as described above has a problem that a steel sheet pile cannot be placed in a place where there is little space under the girder.

  The present invention has been made in view of the problems as described above, and the purpose thereof is a dry work that can make the underwater structure around the underwater structure the same dry work space as the land even when there is little under the space. It is to provide a box and its installation method.

  The dry working box of the present invention has a blade edge portion formed on the bottom with an inner side inclined downward, and an injection nozzle for injecting high-pressure water and a lower edge surface of the blade edge portion. A flat concave and hollow box with an up-and-down movable adjustment plate that comes out is formed to face each other and merge. In addition, the boxes are joined to each other by a joint on the side surface of the joint end, and the joint is provided with a fitting portion provided on one case and a fitting protrusion provided on the other case fitted to the fitting portion. And the fitting protrusion is formed so as to gradually spread from the front end toward the rear end, and the fitting portion is formed so as to gradually spread from the rear end toward the front end.

  In addition, a dry working box is installed by forming a blade edge portion whose inner surface is inclined downward toward the outside at the bottom, and an injection nozzle for injecting high-pressure water to the blade edge portion and extending from the tip of the blade edge portion. A flat work box with an up-and-down moveable unevenness adjustment plate installed and a hollow work box made by combining hollow boxes facing each other and floating in the water, in the underwater ground After enclosing the pier standing on the buried footing foundation, the dry work box is submerged to allow the blade edge to settle on the water bottom ground, and the gap formed between the edge of the water bottom ground and the blade edge Is closed with the unevenness adjustment plate extending from the tip of the blade mouth, the water level inside the dry work box is lowered from the outside, the bottom of the water is ground, and the high pressure from the spray nozzle directly under the dry work box blade is The earth and sand are removed by jetting water, the dry work box is sunk, and the cutting edge is the footing foundation In the position enclosed, characterized by pouring the water concrete in the gap portion formed between the footing foundation.

  By using a dry work box, even a pier with little under-girder space can be surrounded easily. Moreover, the gap formed between the blade edge portion due to the unevenness of the water bottom ground can be closed with the unevenness adjusting plate. In addition, the amount of dredged soil can be reduced because it is only necessary to dredge the water bottom ground inside the dry work box. Moreover, since the water level inside the dry work box is made lower than the outside and the bottom of the bottom is dredged, the diffusion of polluted water inside can be prevented. In addition, since the blade edge part surrounds the footing foundation and water is stopped by placing underwater concrete in the gap formed between the footing foundation, uneven adjustment on the upper surface of the footing foundation becomes unnecessary. . Since the cross-sectional shape of the underwater concrete is trapezoidal, water can be reliably stopped.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a dry work box and its installation method according to the present invention will be described below with reference to the drawings. First, a dry work box will be described, and then this installation method will be described. In each embodiment, the same components are described with the same reference numerals, and only different components are described with different reference numerals. To do.

  FIG. 1 shows a dry work box 1. The dry work box 1 is constituted by two boxes 2 and 3 facing each other and joined together by a joint tool 4. Since this dry work box 1 is installed on the peripheral surface of the footing foundation, it has a size to enclose it.

  A plurality of, for example, three assembly units 5, 6, and 7 are joined up and down with bolts via packings, and the box 2 and 3 are formed in a plane concave shape, that is, a U-shape. The assembly units 5, 6, 7 are formed in a hollow shape, the inside thereof is partitioned into a plurality of chambers 9 by partition walls 8, and a valve 10 is provided in the chamber 9 into which ballast water is poured. Further, at the lower part of the lowermost assembly unit 7, a blade edge portion 12 is formed by an inclined plate 11 whose inner surface is inclined outwardly downward, and an injection nozzle 13 and an unevenness adjustment plate 14 are formed in the blade edge portion 12. Are installed at appropriate intervals. The boxes 2 and 3 are not formed by joining the assembly units 5, 6, and 7 as described above, but can be formed from the beginning.

  As shown in FIG. 2, the spray nozzle 13 sprays high-pressure water that removes the sediment immediately below the blade edge of the dry work box 1, and is installed at appropriate intervals over the entire length of the inclined plate 11. . The injection nozzle 13 is installed at a predetermined angle with respect to the inclined plate 11, the tip projects outward, and a hose 16 from a ground pump (not shown) is connected to the rear end. Further, the installation angle of the injection nozzle 13 can be freely changed and can be made vertical. Therefore, high-pressure water is jetted in a range from the obliquely lower side inside the blade edge portion 12 to just below, and an insertion groove into which the blade edge portion 12 is inserted is excavated in the water bottom ground.

  The unevenness adjusting plate 14 closes a gap formed between the blade edge 12 and the bottom edge of the water bottom, and is installed at the tip of the rod 18 of the hydraulic cylinder 17 so as to extend from the tip of the blade 12. It extends to the outside. The unevenness adjusting plate 14 has an appropriate width, is installed without a gap over the entire length in the lateral direction of the blade portion 12, and can be closed at any gaps formed anywhere.

  In addition, as shown in FIG. 3, the joint 4 is installed at each joint end 20 on each side of the box, that is, each joint end of each assembly unit 5, 6, 7. The joint 4 includes a fitting portion 21 and a fitting projection 22. The fitting portion 21 is installed on the inner and outer surfaces of the joining end portion 20 of one box 2, and the fitting projection 22 is on the other side. Are installed on the inner and outer surfaces of the joint end 20 of the box 3.

  Moreover, the fitting part 21 installed in the inner and outer surface in the joining end part 20 of one box 2 becomes two guide pieces 23 facing up and down, and becomes gradually wide from the rear end toward the front end. It is formed, and is also formed so as to gradually spread from the front end to the rear end in plan view.

  Further, the fitting protrusion 22 inserted into the fitting portion 21 is installed on the inner and outer surfaces of the joint end portion 20 of the other box 3, and the front end portion protruding forward is directed from the front end to the rear end in the front view. The width gradually increases and also gradually widens from the rear end toward the front end in plan view.

  Therefore, as shown in FIG. 4, when one box 2 and the other box 3 are pulled together by a rope 24, a fitting protrusion 22 is inserted into the fitting portion 21, and the joining bracket 25 is joined by a bolt 26. The boxes 2 and 3 are joined together to form a cylindrical box work box 1.

  Note that one of the boxes 2 and 3 is joined by a hinge, and can be opened and closed around this.

  Next, the installation method of said dry-type work box is demonstrated based on FIGS. As shown in FIG. 6, the dry work box 1 is installed on a pier 31 having a small space under the girders (distance from the underside of the girder to the water surface) in which the footing foundation 29 is buried in the water bottom ground 30 or a footing. It is a bridge pier with little under-girder space where earth and sand are accumulated on the upper surface of the foundation 29. The dry work box 1 is installed in order to provide seismic reinforcement or the like to the bridge pier 31 having a small space under the girder.

  In this installation method, as shown in FIG. 5, first, the boxes 2 and 3 are individually attached to the fixed mount 33 of the outfitting table ship 32 and towed to the work site. Then, after arriving at the work site, as shown in FIG. 6, the boxes 2 and 3 face each other with the pier 31 interposed therebetween, and a guide spacer 34 is installed inside.

  Next, when one box 2 is drawn to the other box 3 by a rope 24, the fitting protrusion 22 is fitted to the fitting portion 21, and the joined joint bracket 25 is joined by the bolt 26, FIG. As shown in FIG. 2, the dry work box 1 surrounding the pier 31 is formed. Since the dry work box 1 is installed on the peripheral surface of the footing foundation 29, the dry work box 1 has a size for enclosing it.

  Next, ballast water is injected from the valve 10 into the hollow chamber 9 in the boxes 2 and 3, and the dry work box 1 is sunk along the pier 31 to be settled on the water bottom ground 30. At this time, when a gap 35 is formed between the bottom edge 30 and the blade edge portion 12 due to unevenness, the unevenness adjusting plate 14 closes the gap 35. This extends the unevenness adjusting plate 14 in which the gap 35 is located from the tip of the blade edge, and pushes the tip against the water bottom ground 30 to close it. In this way, the dry work box 1 surrounds the water bottom ground 30 on the footing foundation so that the polluted water does not leak to the outside.

  Next, as shown in FIG. 8, the inside of the dry work box 1 is dripped, but before that, the inner water 36 is pumped up to be lower than the outside water level, so that the polluted water is removed from the dry work box 1. To prevent leakage. The reason why the water level can be lowered is that the gap 35 can be closed by the unevenness adjusting plate 14.

  Next, the bottom ground 30 inside the dry work box 1 is excavated with a sand pump, and high pressure water is injected from the injection nozzle 13 to excavate the insertion groove 37 below the blade edge part 12 to dry the dry work box. Sink 1 When this dry work box 1 does not sink due to its own weight alone, it is pushed down by a press-fitting device 39 installed between the girder 38.

  Next, as shown in FIG. 9, when the blade edge 12 sinks to a position surrounding the peripheral surface of the footing foundation 29, an underwater concrete 41 is placed between the footing foundation 40 and water is stopped. The space 40 between the footing foundations is formed in a trapezoidal shape with a wide lower side by the blade edge portion 12, so that the underwater concrete 41 can be easily placed from the inside.

  After the water is stopped by the underwater concrete 41, as shown in the figure, a cutting beam is installed inside the dry work box 1 to discharge the water 36, thereby forming the same dry space as the land.

It is a dry-type work box, (1) is a plan view and (2) is a front view. It is sectional drawing of a dry-type work box. It is a joining tool, (1) is a plan view and (2) is a front view. (1) is a plan view of the box facing each other, (2) is a plan view of a connector comprising a fitting portion and a fitting projection, (3) is a plan view of the joint portion, and (4) is a front view of the same. It is. (1) is a side view of an outfitted carriage with a dry work box, and (2) is a plan view thereof. A box is installed around the pier, (1) is a plan view, and (2) is a cross-sectional view. It is sectional drawing of the dry-type work box which extended the unevenness adjustment board. It is sectional drawing which is rubbing the inside of a dry-type work box. (1) is a sectional view in which a dry work box is installed on a pier, and (2) is a sectional view in which underwater concrete is placed between the footing foundation.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Dry work box 2, 3 Box 4 Joiner 5, 6, 7 Assembly unit 8 Bulkhead 9 Room 10 Valve 11 Inclined plate 12 Blade part 13 Injection nozzle 14 Non-landing adjustment plate 16 Hose 17 Hydraulic cylinder 18 Rod 20 Joint end Part
DESCRIPTION OF SYMBOLS 21 Fitting part 22 Fitting protrusion 23 Guide piece 24 Rope 25 Joint bracket 26 Bolt 29 Footing foundation 30 Submarine ground 31 Bridge pier 32 Fitting base ship 33 Fixed mount 34 Guide spacer 35 Crevice 36 Water 37 Insertion groove 38 Girder 39 Press fitting device 40 Footing Between the foundations 41 Underwater concrete

Claims (3)

  A blade edge portion whose inner surface is inclined downward toward the outside is formed at the bottom portion, and an injection nozzle that injects high-pressure water to the blade edge portion, and a vertically movable uneven adjustment plate that extends from the tip of the blade edge portion. A dry work box characterized in that a flat concave and hollow box in which the and are installed are combined to face each other.   Boxes are joined with a joint on the side surface of the joint end, and the joint is provided with a fitting part provided on one box and a fitting protrusion provided on the other box fitted to the fitting part. The front end of the fitting protrusion is formed to gradually expand from the front end to the rear end, and the fitting portion is formed to gradually expand from the rear end to the front end. The dry work box described.   A blade edge portion whose inner surface is inclined downward toward the outside is formed at the bottom portion, and an injection nozzle that injects high-pressure water to the blade edge portion, and a vertically movable uneven adjustment plate that extends from the tip of the blade edge portion. A dry-type work box that is a flat concave shape with two hollow boxes facing each other and united with each other was placed on a footing foundation buried in the bottom of the ground while floating in water. After enclosing the pier, the dry work box was sunk to allow the blade edge to settle on the bottom of the ground, and the gap formed between the blade edge and the edge of the water bottom was extended from the edge of the edge. After plugging with a non-landing adjustment plate, the water level inside the dry work box is lowered from the outside to dredge the bottom of the bottom, and the earth and sand are removed by jetting high pressure water from the spray nozzle directly under the dry work box blade mouth. At the position where the dry work box is lowered and the blade edge surrounds the footing foundation, the footing Installation of dry working box making, characterized by pouring the water concrete in the gap portion formed between the foundation.

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