JP2002348897A - Cut-off method of working box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cut-off method of a working box unnecessary for measurement of a working objective or the like in advance and a mechanism for forcedly pushing a cut-off packing against the working objective. SOLUTION: The cut-off method of the working box is so constituted that the underwater working objective 7 is surrounded by the upper opened working box 1 formed in a plane circular shape by connecting at least a pair of hollow units 2 and, at the same time, that an underwater unseparable concrete 15 is cast in a space section 9 after the front end of a bottom plate 4 of the working box 1 is approached to the underwater working objective 7 at the proper space section 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for stopping water in a work box.

[0002]

2. Description of the Related Art In recent years, there has been an urgent need for maintenance, inspection, repair, reinforcement, and the like of structures constructed underwater such as rivers.
In these operations, as shown in FIG. 8A, a work box 21 is installed so as to surround the work object 20, and water inside the work box 21 is discharged to dry the work space 22.
Had formed. As shown in (2) and (3) of the figure, the water stop for forming the work space 22 is as follows.
A waterproof packing 23 such as hard rubber and a seal rubber 24 are installed between the bottom plate 25 and the work 20.

[0003]

However, in the above-mentioned water stopping method, after a detailed measurement of a portion where a water stop packing or a seal rubber is in contact, a work box is fitted to a work object or work is performed on a work box. It was necessary to perform processing to match the object. In addition, a forced pressing force was required to bring the waterproof packing, seal rubber, etc. into close contact with the work object.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to measure a work object in advance and to provide a mechanism for forcibly pressing a watertight packing against the work object. An object of the present invention is to provide a method of stopping water for a work box which is not required.

[0005]

Means for achieving the above object are to provide a method for stopping water in a work box according to the first aspect of the present invention, wherein at least a pair of hollow units are joined to form an upper opening having a planar annular shape. While surrounding the work object underwater with the work box of the mold, the tip of the bottom plate of the work box is brought close to the work object underwater with an appropriate gap, and then concrete that is inseparable in water is poured into the gap. The water stopping method for a work box according to claim 2 is characterized in that, in claim 1, the tip surface of the bottom plate of the work box is inclined downward and outward toward the lower side. Inclined surface inclined inward,
The water stopping method of the work box according to the third aspect of the present invention is characterized in that the water stopping method is a vertical surface.
The method according to any one of claims 1 to 3, wherein a release material is provided on a tip end surface of the bottom plate. A water stopping material is installed on at least one of the end surfaces of the bottom plate of the present invention. Characterized in that anchor walls are provided on the wall surface.

[0006] Even if the gap between the work box and the work is different from the design value, the work can be performed without any problem. In the case where the bottom surface of the bottom plate is inclined downward and outward, if the work box is pushed down and the underwater concrete is poured, the water stopping performance is increased by the wedge effect. In the case where the tip end surface of the bottom plate is an inclined surface that is inclined inward toward the lower side, when the work box is pushed up, the water stopping performance is increased by the same wedge effect as described above. In addition, when the bottom surface of the bottom plate is a vertical surface, the work box is pressed against the work object and the underwater concrete is poured, so that the water stopping performance is increased. Also, since the concrete box which is inseparable in water is poured into the gap after the work box is installed on the work object, the water can be reliably stopped. Moreover, the work box can be easily removed from the work object by the release material provided on the tip end face of the bottom plate of the work box. In addition, the water stoppage material increases the water stoppage. In addition, the anchor bars provided on the work object can prevent floating of the inseparable concrete underwater. Since there is no need to provide a watertight packing in the work box, maintenance for reuse of the work box can be simplified.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for stopping water in a work box will be described below with reference to the drawings. Further, in each embodiment, the same configuration is denoted by the same reference numeral, and a different configuration is denoted by a different reference numeral.

FIGS. 1 to 3 show a method for stopping water in a work box according to the first embodiment. The work box 1 used in this water stopping method has semicircular hollow units 2 joined by hinges 3, which can be opened and closed around the hinges 3, and the bottom plate 4 is shaped to surround the work object. Further, the tip end surface of the bottom plate 4 is an inclined surface 5 inclined outward toward the lower side, and a water-stopping rubber 6 is provided on the inclined surface 5 to increase the water-stopping property. The operation of raising and lowering the work box 1 is performed by pouring and draining water into and out of the hollow unit 2.

[0009] Such a work box is submerged by pouring water into the hollow unit 2, and is installed so as to surround the column base 7, and a cutting beam 8 is erected. At this time, the bottom plate 4 surrounds the footing 10 with a slight gap 9, and a release material 11 such as a release sheet or a release agent and a waterproof rubber 6 are provided on the inclined surface 5 by land work. On the other hand, an anchor bar 13 and a waterproof rubber 6 are provided on a wall surface 12 of the footing facing the inclined surface 5 before the work box 1 is sunk.

Next, when the work box 1 is pushed down, underwater inseparable concrete 15 is poured into the gap 9 whose lower surface is closed by the plate 13, and the concrete 15 is pressed by the anchor bar 14 so as not to float. Water stoppage is also enhanced by the wedge effect. Thus concrete 15
After the bottom plate 4 is brought into close contact with the footing 10, water inside the work box 1 is discharged by a pump to form a dry work space 16. Next, this dry work space 16
To repair the work, and after the work is completed, the work box 1 is raised. At this time, the bottom plate 4 is easily separated from the concrete 15 by the release material 11 on the inclined surface 5.

FIG. 4 shows a method of stopping water in a work box according to the second embodiment, which is the same as the first embodiment except that only the waterproof rubber 6 is provided on the footing 10. Is the way. As described above, even if the anchor streak 14 is not provided, the concrete 15 can be prevented from rising, and the waterproofness of the waterproof rubber 6 can be enhanced.

FIG. 5 shows a method of stopping water in a work box according to a third embodiment, in which an inclined surface 5 of a bottom plate and a footing 10 are provided.
The method is the same as that of the first embodiment, except that the waterproof rubber 6 is removed from the base and the anchor bar 14 is provided only on the footing 10. Concrete 15
Can be prevented from rising.

FIG. 6 shows a method for stopping water in a work box according to a fourth embodiment, in which a work box 1 having a slope 17 in which the tip of a bottom plate is inclined inward toward the lower side is used. is there. In this method, underwater concrete 15 is poured into the gap portion 9 while pushing down the work box 1 so as to increase the waterproofness by a wedge effect.
This is the same method as the method for stopping water in the work box of the third to third embodiments.

FIG. 7 shows a method for stopping water in a work box according to a fifth embodiment, in which a work box 1 having a vertical surface 18 at the tip of a bottom plate is used. In this method, underwater inseparable concrete 15 is poured into the gap 9 while the work box 1 is pressed against the work object to increase the water stoppage in the same manner as described above. This is the same method as the water stopping method of the work box of the first to third embodiments.

[0015]

As described above, even if the gap between the work box and the work object is different from the design value, the work can be performed without any problem.

Since the tip of the bottom plate is an inclined surface which is inclined outward toward the lower side, if the work box is pushed down and underwater concrete is poured, the water stopping performance can be increased by the wedge effect.

Since the tip of the bottom plate is an inclined surface which is inclined inward toward the lower side, when the work box is pushed up and underwater concrete is poured, the waterproofness can be increased by the wedge effect.

Since the tip of the bottom plate is a vertical surface, the waterproofness can be improved by pressing the work box against the work object and casting the underwater concrete.

After the work box is installed on the work object, concrete that is inseparable in water is poured into the gap, so that the water can be reliably stopped.

The work box can be easily removed from the work object by the release material provided on the tip end surface of the bottom plate of the work box.

The water stopping material can enhance the water stopping performance.

The anchor bars provided on the work object can prevent floating of the concrete that is inseparable in water.

Since it is not necessary to provide a watertight packing in the work box, maintenance for reusing the work box can be simplified.

[Brief description of the drawings]

FIG. 1 is a plan view showing a method for stopping water in a work box according to a first embodiment, in which the work box is installed on a work object.

FIG. 2 shows a method of stopping water in a work box according to the first embodiment;
It is sectional drawing which installed the work box on the work object.

FIG. 3 is an enlarged sectional view of a bottom plate.

FIG. 4 is a cross-sectional view illustrating a method for stopping water in a work box according to a second embodiment.

FIG. 5 is a sectional view showing a method for stopping water in a work box according to a third embodiment.

FIG. 6 is a sectional view showing a method for stopping water in a work box according to a fourth embodiment.

FIG. 7 is a sectional view showing a method of stopping water in a work box according to a fifth embodiment.

8 (1) to 8 (3) are cross-sectional views showing a method of stopping water in a work box according to a conventional embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 21 Work box 2 Hollow unit 3 Hinge 4 Bottom plate 5, 17 Inclined surface 6 Waterproof rubber 7 Column base 8 Cut beam 9 Gap part 10 Footing 11 Peeling material 12 Wall 13 Plate 14 Anchor 15 Concrete 16 Work space 18 Vertical plane

Claims (5)

[Claims] 1. An underwater work object is surrounded by an open-top work box formed by joining at least a pair of hollow units into a planar annular shape, and a tip of a bottom plate of the work box is attached to the underwater work object. After approaching appropriately with a gap,
A method for stopping water in a work box, comprising casting concrete that is inseparable in water in the gap. 2. The tip surface of the bottom plate of the work box is any one of a slope inclined downward and outward, a slope inclined inward and downward, and a vertical surface. The method for stopping water in a work box according to claim 1. 3. The method for stopping water in a work box according to claim 1, wherein a release material is provided on a tip end surface of the bottom plate. 4. The stop of a work box according to claim 1, wherein a water-stopping material is installed on at least one of a wall surface of the work object or a tip end surface of a bottom plate of the work box. Water method. 5. The method for stopping water in a work box according to claim 1, wherein an anchor bar is provided on a wall surface of the work object.