JP3024932B2 - Dry work method and work box used for it - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dry work method and a work box used for inspection, repair, corrosion protection and reinforcement of underwater constructed structures such as piers under the same conditions as on land. It is.

[0002]

2. Description of the Related Art Piers and piers constructed by placing steel pipes or concrete piles or the like in water, if left unattended, will significantly corrode and reduce their functions.
It may become unusable. Particularly, underwater and the like are severely corroded by seawater, so that maintenance and repair thereof are urgently required.

[0003] In this maintenance and repair work, as shown in FIG. 16, a water stop sheet pile 31 is driven around a pier 32 as a work object by using a pile driving boat 30 or the like, and the water inside the pier 32 is drained. As a result, the same dry work space 33 is formed on land.

[0004]

However, the above-mentioned working method has the following problems. Large-scale earth retaining work had to be implemented because the piles were driven into the area around the work using a piled ship or the like. Since the earth retaining work is to cover a wide range of work, narrowing the navigation routes of navigating vessels in rivers and canals,
Or was restricted. It was difficult to remove the cut-off sheet piles for a short time during flooding or flooding. When there is a structure above the construction site, the height of the pile driver was limited, or a short sheet pile had to be added along the way.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a dry working space similar to that on land in a narrow range by a simple method without using a pile driver or the like. An object of the present invention is to provide a dry work method and a work box used therefor which can be formed, can be easily removed, and can be adapted to any environment.

[0006]

Means for solving the above problems are as follows. In the dry working method, a water stop guide is erected at the bottom so as to surround a work object constructed underwater. A work box is sunk along the water stop guide to surround the entire periphery of the work object, and water is stopped between the bottom of the work box and the water stop guide by a water stop jig. The enclosed inner water is drained to form a dry work space, the work box is set down along the inside or outside of the water stop guide, and the work box has a plurality of assembly units. The water stopping jig is an inflatable and contractible tube. In addition, the work box is composed of multiple assembly units that can be split
An annular box having a working space is formed inside thereof, and a water stop jig that can be expanded and contracted is provided on the outer periphery of a lower part of the box. The assembly unit is provided with a float tank. The float tank is provided with a pouring / draining port, and the water stopping jig is an inflatable and contractible tube.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. 1 is a perspective view of a work box of the present invention, FIG. 2 is a sectional view of the same, FIG. 3 is a plan view before assembling, FIG. 4 is a plan view after assembling, and FIG. It is sectional drawing.

As shown in FIG. 1, a work box 1 of the present invention is formed in a ring shape by connecting a pair of semicircular assembly units 2 with hinges 3 and rotating the hinges 3 as a center to combine them. It is attached so as to surround a work object such as a bridge or a pier.

[0009] These assembly units 2 are provided with a float tank 4 at the top and can be floated on the water surface, and can be laid down by pouring water into the inside from a top injection port 5. A waterproof material 6 such as rubber is provided on the joint surface of the assembly unit 2.
Is attached to prevent water from flowing inward from the joint when assembled as the work box 1.

A water stop jig 7 such as a rubber tube is provided on the outer periphery of the lower portion of the float tank 4, and an air supply pipe 10 from a compressor 9 is connected to an air inlet 8 of the jig 7. It is designed to swell.
It should be noted that the liquid can be injected into the water stoppage jig 7 by a pump instead of the compressor 9 and expanded. One end of the rubber tube is fixed to the assembly unit 2 with a mounting screw 11, but the other end is extended so as to overlap one end of the rubber tube of the other assembly unit 2.

FIG. 6 shows a rubber tube water-stopping jig 7 having a mounting screw 11 provided on an upper portion thereof, and an air supply pipe 10 from a compressor 9 to an air inlet 8 of an expansion section 12. Is connected.

Although the work box 1 is composed of a pair of assembly units 2, this is not limited to a pair, and it may be composed of two or more assembly units 2.

Next, a dry work method using the work box of the present invention will be described with reference to FIGS. The work object is a concrete pier 13 constructed underwater. First, as shown in FIG.
The upper sedimentary soil 14 is dredged using the dredger 15.

The dredged basic footing 13a
The water stop guide 16 is constructed in an annular shape so as to surround the pier 13 above. In this method, formwork 18 is erected on both sides of an L-shaped steel plate 17 buried upside down on a base footing 13a,
Concrete 19 is poured between the shaped steel plate 17 and the formwork 18 to level the upper surface, and after the concrete has hardened, the formwork 18 is removed.

Next, as shown in FIG. 9, the pier 13 is positioned at the center of the work box 1 in a state where the work box 1 including the pair of assembly units 2 is towed by the work boat 20 and floated on the water surface. assemble.

Then, as shown in FIG. 10, a pump 21
Pour concrete inside the water stop guide 16
Sink on 9 When the water stop guide 16 is set inside, the gap 22 is appropriately formed between the outer periphery of the lower part of the work box 1 and the inside of the water stop guide 16, but the water stop jig 7 is expanded by the copressor 9 to stop the water. By pressing against the inside of the guide 16 to make it watertight, water does not enter from here. In addition, the displacement at the time of submerging the work box 1 is corrected by the expansion force that the water stop jig 7 expands evenly, and the pier 13 is always installed at the center position of the work box 1. The work box 1 is provided with concrete 19 on the outside of the water stop guide 16.
In this case, the water stop jig 7 is attached to the lower inner periphery of the assembly unit. Further, the work box 1 can be installed on the foundation footing 13a inside or outside the water stop guide 16.

Next, as shown in FIG. 12, water is drained from the inside of the work box 1 by a drain pump 23 to form a dry work space 24 as on land. Perform repairs or inspections.

When the repair or inspection work is completed,
As shown in FIG. 13, water is injected into the work box 1 by the water supply pump 25, and air is extracted from the water stop jig 7 and contracted.

Next, as shown in FIG. 14, the water in the float tank 4 is drained by a drain pump 23 and air is injected to float the work box 1.

In this floating state, the work box 1 is divided into two parts, disassembled and removed from the pier 13, and then towed by the work boat 20 and diverted to another pier. In this embodiment, the dry work method using the work box 1 of the pair of assembly units 2 has been described. However, the work method is the same for a work box of two or more assembly units. .

[0021]

According to the present invention, a water stop guide is erected at the bottom so as to surround a work object built in water, and a work box is sunk along the water stop guide to cover the entire circumference of the work object. enclosure,
By stopping the water between the bottom of the work box and the water stop guide with a water stop jig and draining the water enclosed by the work box to form a dry work space, a simple method is used. Dry work can be performed under the same environment as on land, and work objects of any shape can be handled.

By disposing the work box along the inside or outside of the water stop guide, the work box can be installed on both sides of the water stop guide.

Since the work box is formed by combining a plurality of assembly units, a large work box can be easily formed, and installation and removal from and to a work object can be performed easily and quickly.

Since the water stopping jig is a tube that can be expanded and contracted, it can be easily attached to the work box, and the displacement of the installation position when the work box is sunk can be corrected.

A plurality of assembling units are divided and combined to form an annular box having a working space inside, and a water stop jig which can be expanded and contracted is provided on a lower outer periphery of the box. Thus, any work target can be handled.

By injecting and draining water into and from the float tank of the assembly unit, the work box can be easily transported and settled, so that a hoist ship or the like is not required.

[0027]

[Brief description of the drawings]

FIG. 1 is a perspective view of a work box.

FIG. 2 is a sectional view of a work box.

FIG. 3 is a plan view of a work box before assembling.

FIG. 4 is a plan view of the work box after assembly.

5A is a cross-sectional view taken along line AA of FIG. 2, and FIG. 5B is an enlarged view of a joint of FIG.

6 (1) is a front view of a rubber tube, (2) is a side view of the same, (3) is a side view of an expanded rubber tube,
(4) is the same sectional view.

FIG. 7 is a sectional view showing dredging on a foundation footing.

FIG. 8 is a cross-sectional view in which a water stop guide is installed on a basic footing.

FIG. 9 is a sectional view of towing a work box to a pier.

FIG. 10 is a sectional view in which a work box is installed around a pier.

FIG. 11 is a sectional view of draining water inside the work box.

FIG. 12 is a cross-sectional view in which water inside the work box is drained.

FIG. 13 is a cross-sectional view of pouring water into the inside of the work box.

FIG. 14 is a sectional view in which the work box is floated.

FIG. 15 is a sectional view of towing a work box.

16 (1) and (2) are sectional views showing a conventional dry working method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Work box 2 Assembly unit 3 Hinge 4 Float tank 5 Injection / drainage port 6 Water stop material 7 Water stop jig 16 Water stop guide 24, 33 Work space

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-9-242080 (JP, A) JP-A 54-61414 (JP, U) JP-A 62-103846 (JP, U) (58) Investigation Field (Int.Cl. ⁷ , DB name) E02D 19/04

Claims (7)

(57) [Claims] 1. A water stop guide is erected at the bottom so as to surround a work object built in water, and a work box is sunk along the water stop guide to cover the entire circumference of the work object. enclosure,
A dry work space in which water is stopped between a bottom portion of the work box and a water stop guide by a water stop jig, and water inside the work box is drained to form a dry work space. Method. 2. The dry work method according to claim 1, wherein the work box is provided along the inside or outside of the water stop guide. 3. The dry work method according to claim 1, wherein the work box is formed by combining a plurality of assembly units. 4. The dry working method according to claim 1, wherein the water stopping jig is a tube that can be expanded and contracted. 5. A plurality of assembling units are separably combined to form an annular box having a working space inside thereof, and a water-stopping jig which is inflatable and contractible on a lower outer periphery of the box. A work box characterized by being provided with. 6. The work box according to claim 5, wherein the assembly unit is provided with a float tank, and the float tank is provided with a pouring and discharging port. 7. The work box according to claim 5, wherein the water stopping jig is a tube that can be expanded and contracted.