JP2016079591A - Work caisson and cut-off method for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily cut off a work caisson when forming a work space by enclosing a part of a structure with the work caisson.SOLUTION: A work caisson 30, which surrounds a part of a structure (weir column 2) to form a work space, includes a first inclined surface 32 that is inclined to get closer to the structure when getting closer to the work space at a vertically extended end attached to the structure, and first wedge-shaped cut-off packing 10.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a work box and a water stop method for the work box.

  As an example of a technique for repairing or reinforcing an existing structure in water, Patent Document 1 discloses that the entire periphery of the structure is temporarily cut off with a work box to dry around the structure. Forming a working space.

JP 2008-175059 A

However, there are cases where the entire circumference of the structure cannot be temporarily closed. As an example of such a structure, a case of a sluice weir pillar will be described. FIG. 1 is a plan view of the sluice 9, and FIG. 2 is a side view in the direction of arrow I in FIG. 1. Footing concrete 1 is provided on the bottom of the water, and weir pillars 2 are formed on the bottom at predetermined intervals. The dam pillar 2 is provided with an opening / closing mechanism 4 that slides the gate 3 provided between the dam pillars 2 adjacent to each other and slides in the vertical direction. In the case of this structure, a work box (see the broken line in FIG. 1) surrounding the entire circumference of the weir column 2 cannot be installed while the sluice 9 is in service. Therefore, as shown in FIG. 3, a work box 6 having an opening 5 on the side surface is manufactured, and the work box 6 is moved by the carriage 7 so that the weir column 2 is accommodated in the opening 5. It is conceivable to partially cut the periphery of the area. In this case, in order to prevent the end of the opening 5 from contacting the dam pillar 2 and damaging the dam pillar 2, it is necessary to make the width of the opening 5 wider than the width of the dam pillar 2, There is a problem that it is difficult to stop water in the gap between the end of the opening 5 and the weir column 2.
Therefore, the present invention provides a technique capable of easily stopping water when a work space is formed by surrounding a part of a structure with a work box.

According to the present invention, in a work box that surrounds a part of a structure to form a work space, a first inclined portion that approaches the structure as it approaches the work space at an end portion extending in a vertical direction attached to the structure. Provided is a work box comprising an inclined surface and a wedge-shaped first water stop packing.
Said structure WHEREIN: Foam rubber may be provided in the side which touches the said structure in a said 1st water stop packing.
In the above configuration, the first water-stopping packing is provided with a second inclined surface that is inclined so as to approach the bottom of the water as the working space is approached, and an upper surface that contacts the second inclined surface and a bottom surface that contacts the water bottom. And a wedge-shaped second water-stopping packing.
In the above configuration, at least one of the first water stop packing and the second water stop packing may have a substantially concave cross-sectional shape.
Said structure WHEREIN: You may have the 3rd inclined surface inclined so that it might distance from the said work space, so that the water bottom was approached in the edge part extended in the up-down direction attached to the said structure.
In addition, the present invention is any of the above-described water stop methods for a work box, wherein the first water stop packing is moved along the first inclined surface in a direction approaching the work space, There is provided a water stopping method for a work box characterized in that water is discharged by draining water pressure applied to the first water stopping packing in the horizontal direction.

  According to the present invention, water can be easily stopped when a work space is formed by surrounding a part of a structure with a work box.

The top view of a sluice. The side view in the arrow I of FIG. The figure which shows the work box 6 which has the opening part 5 in a side surface. The top view which shows the state which the temporary deadline by the work box 30 was completed. The figure which shows the work box 30. FIG. The figure which shows the 1st water stop packing. The figure which shows the 2nd water stop packing. The figure which shows a mode that the 1st water stop packing 10 is installed. The figure which shows a mode that the 2nd water stop packing 20 is installed. The figure which shows the edge part extended in the up-down direction attached to the dam pillar 2 of the work box 40. FIG. The figure which shows the 2nd water stop packing 50. FIG. The figure which shows a mode that the 2nd water stop packing 50 is installed.

<First Embodiment>
An example for carrying out the present invention will be described. The structure assumed as a target for repair or reinforcement in the present embodiment is the dam pillar 2 of the sluice 9 described above (see FIGS. 1 and 2).
FIG. 4 is a plan view showing a state where the temporary closing by the work box 30 is completed. In the following description, the direction of arrow II shown in FIG. 5A and 5B are diagrams showing the work box 30, wherein FIG. 5A is a plan view, FIG. 5B is a front view, FIG. 5C is a right side view, and FIG.

  The work box 30 is a structure for enclosing a part of the dam pillar 2 and forming a work space. In the following description, the space outside the work box 30 is referred to as an external space. The work box 30 has a shape in which a central portion of one side of the rectangle is cut out in a plan view, and the dam pillar 2 is accommodated in the cut-out portion (hereinafter referred to as an opening 31). The work box 30 includes a first inclined surface 32 that is inclined so as to approach the dam pillar 2 as it approaches the work space at an end portion extending in the vertical direction attached to the dam pillar 2. That is, the distance between the end portion on the work space side of the first inclined surface 32 and the weir column 2 is smaller than the distance between the end portion on the outer space side of the first inclined surface 32 and the weir column 2. In addition, the width of the opening 31 is wider than the width of the dam pillar 2 so that contact between the first inclined surface 32 and the dam pillar 2 can be avoided.

  The work box 30 has a hollow structure and is provided with a water inlet / outlet for water injection / drainage in the internal space (not shown). When the internal space of the hollow structure is drained, the work box 30 floats on water, and when the water is poured into the internal space, the work box 30 sinks in water. The gap between the first inclined surface 32 and the weir column 2 is stopped by the first water-stop packing 10 and the second water-stop packing 20.

  FIGS. 6A and 6B are views showing the first water-stop packing 10, wherein FIG. 6A is a plan view, FIG. 6C is a front view, FIG. 6B is a left side view, FIG. 6D is a right side view, and FIG. A rear view and (f) are bottom views. The figure shows the first water stop packing 10 on the right side shown in FIG. The left first water-stopping packing 10 has a configuration in which the right side first water-stopping packing 10 is horizontally reversed with the center of the opening 31 as the axis of symmetry. As shown to Fig.6 (a), (f), the 1st water stop packing 10 is formed in the wedge shape substantially. The angle of the wedge is substantially equal to the angle formed between the weir column 2 and the first inclined surface 32 of the work box 30. In FIG. 6, the left side surface 11 of the first water blocking packing 10 is in contact with the dam pillar 2, and the right side surface 16 is in contact with the first inclined surface 32. Foam rubber 11a is provided on the side (left side surface 11) in contact with the weir column 2 of the first water-stop packing 10.

  A second inclined surface 12 is provided at the lower end of the first water-stopping packing 10 so as to be closer to the water bottom as the working space is closer. That is, the distance between the end of the second inclined surface 12 on the working space side and the water bottom is smaller than the distance between the end of the second inclined surface 12 on the outer space side and the water bottom. As shown in FIGS. 6A, 6 </ b> E, and 6 </ b> F, a concave portion 14 extending in the vertical direction is formed on the back surface 13 of the first water blocking packing 10, and has a substantially concave cross-sectional shape in plan view. It has become.

  FIG. 7 is a view showing the second water blocking packing 20, (a) is a plan view, (c) is a front view, (b) is a left side view, (d) is a right side view, and (e) is a side view. A rear view and (f) are bottom views. The figure shows the second water stop packing 20 on the right side shown in FIG. The second water stop packing 20 on the left side has a configuration in which the second water stop packing 20 on the right side is reversed left and right with the center of the opening 31 as the axis of symmetry. As shown in FIGS. 7A and 7F, the second water blocking packing 20 is formed in a substantially wedge shape in plan view. The angle of the wedge is substantially equal to the angle formed between the weir column 2 and the first inclined surface 32 of the work box 30. In FIG. 7, the left side surface 21 of the second water blocking packing 20 is in contact with the weir pillar 2, and the right side surface 26 is in contact with the first inclined surface 32.

  As shown in FIGS. 7B and 7D, the second water blocking packing 20 is generally formed in a wedge shape in a side view. The angle of the wedge is substantially equal to the angle formed between the bottom of the water and the second inclined surface 12 of the first water blocking packing 10. In FIG. 7, the bottom surface 22 of the second water blocking packing 20 is in contact with the water bottom, and the upper surface 27 is in contact with the second inclined surface 12. As shown in FIGS. 7B, 7 </ b> C, 7 </ b> D, and 7 </ b> E, the back surface 23 of the second water-stopping packing 20 is formed with a recessed portion 24 extending in the left-right direction. It has a cross-sectional shape.

  FIG. 8 is a diagram illustrating a state in which the first water blocking packing 10 is installed. FIG. 8A illustrates a state before the first water blocking packing 10 is installed, and FIG. 8B illustrates a state after the installation. The front surface 15 of the first water-stop packing 10 is provided with a metal fitting (not shown) such as an eyebolt, and one end of the rope is connected to this metal fitting, and a diver pulls the rope with a chain block fixed to the water bottom. The first water blocking packing 10 is moved along the first inclined surface 32 in a direction approaching the work space. Thus, as shown in FIG. 8B, the first water blocking packing 10 is drawn between the dam pillar 2 and the first inclined surface 32.

  FIG. 9 is a diagram illustrating a state in which the second water blocking packing 20 is installed. FIG. 9A illustrates a state before the second water blocking packing 20 is installed, and FIG. 9B illustrates a state after the installation. As shown in FIG. 9 (a), the first water-stop packing 10 has a second seal so that a space for fitting the second water-stop packing 20 is secured between the second inclined surface 12 and the water bottom. It installs in the state which separated the inclined surface 12 from the water bottom.

  A metal fitting (not shown) such as an eyebolt is provided on the front surface 25 of the second water stop packing 20, and one end of the rope is connected to this metal fitting, and a diver pulls the rope with a chain block fixed to the water bottom. The 2nd water stop packing 20 is moved in the direction which approaches a work space along a water bottom. Thus, as shown in FIG. 9B, the second water blocking packing 20 is drawn between the water bottom and the second inclined surface 12.

  If the 1st water stop packing 10 and the 2nd water stop packing 20 are installed, the water by the side of work space will be drained with a pump. When the drainage is completed, the water pressure acts on the back surface 13 of the first water-stopping packing 10 and the back surface 23 of the second water-stopping packing 20 as shown by the arrows in FIGS. When the water pressure acts on the back surface 13 of the first water blocking packing 10 in the horizontal direction, the first water blocking packing 10 is pushed into the gap between the weir column 2 and the first inclined surface 32. Moreover, since the recessed part 14 extended in an up-down direction is formed in the back surface 13 of the 1st water stop packing 10, water pressure acts also in the direction which presses the 1st water stop packing 10 against the dam pillar 2 and the 1st inclined surface 32. To do. Moreover, since the foamed rubber 11a is deformed according to the irregularities on the surface of the weir column 2 on the side of the first water-stop packing 10 that contacts the weir column 2, even if the surface of the weir column 2 is uneven, the first stop The water packing 10 is in close contact with the weir pillar 2. On the other hand, on the back surface 23 of the second water stop packing 20, the second water stop packing 20 is pushed in between the water bottom and the second inclined surface 12 due to the water pressure acting in the horizontal direction. In the recess 24, water pressure acts in a direction in which the second water blocking packing 20 is pressed against the water bottom and the second inclined surface 12. In this way, the gap between the weir column 2 and the work box 30 is reliably stopped.

  In addition, it is possible to divert the 1st water stop packing 10 as the 2nd water stop packing 20 by changing direction so that the side which touches the weir pillar 2 of the 1st water stop packing 10 may contact a water bottom.

Second Embodiment
FIGS. 10A and 10B are views showing an end portion extending in the vertical direction attached to the weir column 2 of the work box 40, wherein FIG. 10A is a plan view, FIG. 10D is a front view, FIG. 10C is a left side view, and FIG. Is a rear view, and (e) is a bottom view. The figure shows the right end of the work box 40. The left end has a configuration in which the right end is horizontally reversed with the center of the opening 31 as the axis of symmetry. In addition to the first inclined surface 42 similar to that of the first embodiment, the work box 40 has a third inclined surface 43 that is inclined so as to move away from the working space as it approaches the water bottom at the end portion extending in the vertical direction attached to the weir column 2. Have In other words, the third inclined surface 43 is inclined so as to approach the dam pillar 2 as it approaches the water bottom. Therefore, the gap between the weir column 2 and the third inclined surface 43 becomes narrower as it approaches the water bottom.

  11A and 11B are views showing the second water-stop packing 50, where FIG. 11A is a plan view, FIG. 11C is a front view, FIG. 11B is a left side view, FIG. 11D is a right side view, and FIG. A rear view and (f) are bottom views. The figure shows the second water stop packing 50 on the right side. The left second water-stopping packing 50 has a configuration in which the right side second water-stopping packing 50 is horizontally reversed with the center of the opening 31 as the axis of symmetry. The second water-stopping packing 50 has a shape in which a member having a cross-sectional shape similar to that of the first water-stopping packing 10 is inclined to the working space side. Therefore, the 2nd water stop packing 50 inclines so that it may move away from work space, so that a water bottom is approached. In FIG. 11, the left side surface 51 of the second water blocking packing 50 is in contact with the weir column 2, and the right side surface 56 is in contact with the third inclined surface 43 of the work box 40. The bottom surface 52 of the second water blocking packing 50 is in contact with the water bottom, and the upper surface 57 is in contact with the second inclined surface 12 of the first water blocking packing 10. Foam rubber 51a is provided on the side (left side surface 51) in contact with the weir column 2 of the second water blocking packing 50.

  FIG. 12 is a diagram illustrating a state in which the second water blocking packing 50 is installed. FIG. 12A illustrates a state before the second water blocking packing 50 is installed, and FIG. 12B illustrates a state after the installation. As shown in FIG. 9 (a), the first water-stopping packing 10 has a second space so that a space for fitting the second water-stopping packing 50 is secured between the second inclined surface 12 and the water bottom. It installs in the state which separated the inclined surface 12 from the water bottom.

  A metal fitting (not shown) such as an eyebolt is provided on the front surface 55 of the second water stop packing 50, and one end of the rope is connected to the metal fitting, and a diver pulls the rope with a chain block fixed to the water bottom. The 2nd water stop packing 50 is moved in the direction which approaches a work space along a water bottom. Thus, as shown in FIG. 12B, the second water blocking packing 50 is drawn between the water bottom and the second inclined surface 12.

  If the 1st water stop packing 10 and the 2nd water stop packing 50 are installed, the water by the side of work space will be drained with a pump. When drainage is completed, water pressure acts on the back surface 13 of the first water-stopping packing 10 and the back surface 53 of the second water-stopping packing 50 as indicated by the arrows in FIG. When the water pressure acts on the back surface 13 of the first water blocking packing 10 in the horizontal direction, the first water blocking packing 10 is pushed into the gap between the weir column 2 and the first inclined surface 42. Moreover, since the recessed part 14 extended in an up-down direction is formed in the back surface 13 of the 1st water stop packing 10, water pressure acts also in the direction which presses the 1st water stop packing 10 against the dam pillar 2 and the 1st inclined surface 42. To do. Moreover, since the foamed rubber 11a is deformed according to the irregularities on the surface of the weir column 2 on the side of the first water-stop packing 10 in contact with the weir column 2, even if the surface of the weir column 2 is uneven, the first stop The water packing 10 is in close contact with the weir pillar 2. On the other hand, since the back surface 53 of the second water-stopping packing 50 is inclined so as to move away from the work space as it approaches the bottom of the water, the weir column 2, the third inclined surface 43, The second water blocking packing 50 is pushed into the gap, and the second water blocking packing 50 is pressed against the water bottom and the second inclined surface 12. Moreover, since the recessed part 54 extended in an up-down direction is formed in the back surface 53 of the 2nd water stop packing 50, water pressure acts also in the direction which presses the 2nd water stop packing 50 against the dam pillar 2 and the 3rd inclined surface 43. To do. In this way, the gap between the weir column 2 and the work box 40 is reliably stopped.

<Modification>
The above embodiment may be modified as follows. A plurality of modified examples may be combined.
The first water-stop packing 10 may not be provided with the foam rubber 11a.
The second water-stopping packing 50 may not be provided with the foam rubber 51a.
The first waterstop packing 10 may not be provided with the recess 14.
The recessed part 24 does not need to be provided in the second waterstop packing 20.
The recessed part 54 does not need to be provided in the 2nd water stop packing 50. FIG.
The 1st water stop packing 10 and the 2nd water stop packing 50 may be comprised integrally. For example, the 2nd inclined surface 12 of the 1st water stop packing 10 and the upper surface 57 of the 2nd water stop packing 50 may be connected by adhesion, welding, etc.

1 Footing concrete, 2 Weir pillar, 3 Gate door, 4 Opening / closing mechanism, 5 Opening, 6 Work box, 7 Cargo ship, 10 1st water stop packing, 20 2nd water stop packing, 30 Work box, 40 Work box, 50 2nd water seal

Claims (6)

In a work box that surrounds a part of the structure and forms a work space,
A first inclined surface that is inclined so as to approach the structure closer to the work space at an end portion extending in a vertical direction attached to the structure;
A work box comprising a wedge-shaped first water-stop packing. The work box according to claim 1, wherein foam rubber is provided on a side of the first water-stop packing that contacts the structure. The first water stop packing is provided with a second inclined surface that is inclined so as to approach the bottom of the water as it approaches the working space.
The work box according to claim 1, further comprising a wedge-shaped second water-stopping packing having a top surface in contact with the second inclined surface and a bottom surface in contact with the water bottom. The work box according to any one of claims 1 to 3, wherein at least one of the first water stop packing and the second water stop packing has a substantially concave cross-sectional shape. The work according to any one of claims 1 to 4, further comprising a third inclined surface that is inclined so as to move away from the work space as it approaches the water bottom at an end portion extending in a vertical direction attached to the structure. Box. It is the water stop method of the work box of any one of Claims 1-5,
Moving the first water stop packing along the first inclined surface in a direction approaching the work space;
A water stop method for a work box, wherein drainage from the work space is performed and water pressure is applied to the first water stop packing in a horizontal direction to perform water stop.

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