JPH10237874A - Cofferdam box and construction method for structure using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily execute a work by providing a through-hole extended in one direction within a shell material, and penetrating the shell material in a prescribed length so that the through-hole of the shell material allows a river bottom or sea bottom to communicate with the water surface. SOLUTION: Four steel plates 11a, 11b, 12a, 12b are connected by welding to form a cofferdam box 10 having openings 13, 14 on both ends. When a cofferdam is constructed, the lower opening 14 of the cofferdam box 10 is placed on a river bottom 21 or a groove bottom. Further, a pressure is loaded from above the cofferdam box 10 to press fit a penetrating part having a prescribed length into the ground to close the water of the river by the upper sections of the steel plates 11a, 11b, 12a, 12b, the water within the cofferdam is removed to form a constructing space for constructing a structure. Thus, the setting work and removing work of the cofferdam can be easily executed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temporary deadline box for constructing a structure at the bottom of a river or the sea floor, and a method of constructing a structure using the same.

[0002]

2. Description of the Related Art Conventionally, when a structure such as a continuous underground wall is constructed on a river, the construction exclusive use water surface is limited due to a decrease in cross-sectional area of the river flow due to ship navigation and a temporary deadline for construction work. The area was divided into a plurality of sections, and each time, a temporary deadline was formed with steel sheet piles and the like to shut off the water, the water in the deadline was eliminated, and a continuous underground wall was built inside.

[0003]

In the above-mentioned conventional temporary cut-off work, since the cut-off is formed by a plurality of steel sheet piles, the assembling work and the removing work are troublesome and the workability is poor. .

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks of the prior art, and an object thereof is to provide a temporary deadline box capable of easily performing installation work and removal work of a temporary deadline. Is to do.

Another object of the present invention is to provide a method of constructing a structure that does not require installation and removal of temporary deadlines when constructing a structure in a river or sea.

Another object of the present invention is to provide a temporary deadline box capable of promptly securing a required cross-sectional area of flowing water and reducing a blocking rate of flowing water even when a river suddenly increases in water during construction. .

[0007]

In order to solve the above-mentioned problems, according to the present invention, there is provided a shell material which forms a closed space as a through hole extending in one direction inside, and the through hole of the shell material is a river. From the bottom of the sea or from the sea floor to the water,
A temporary deadline box is provided in which the shell material is inserted into a predetermined length, whereby the inside of the through hole can be used as a construction space for constructing a structure.

Further, in the present invention, a temporary closing box having a closed space as a through-hole in a shell material is inserted into a bottom of a river or a seabed for a predetermined length, and water in the closed space is shut off. And a method for constructing a structure, wherein the method is used as a construction space for constructing a structure on a river or sea floor.

[0009] In the temporary closing box of the present invention, the shape of the shell material is not particularly limited as long as it can form a closed space as a through hole extending in one direction in the inside thereof. It may be formed in a sectional shape.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments will be described below with reference to the accompanying drawings, but the present invention is not limited to these embodiments. FIG. 1 is a perspective view showing a temporary deadline box of the present invention, FIG. 2 is a cross-sectional view showing the temporary deadline box installed at the bottom of a river, and FIG. 3 is a continuous ground being constructed in the temporary deadline box. FIG. 4 is a plan view of the inner wall, FIG. 4 is a cross-sectional view taken along dashed-dotted line IV-IV in FIG. 3, and FIG. is there.

In FIG. 1, a temporary closing box 1 of the present invention is shown.
No. 0 has openings 13 and 14 at both ends, respectively, so that four steel plates 11a and 11a are formed so that a through hole is formed in the Y-axis direction in the figure.
11b, 12a, and 12b are formed by welding. This temporary deadline box 10 is, for example, L × W × H = 600
It can be formed to a size of about 0 × 2000 × 2500 mm, but this size can be appropriately determined as needed.

The temporary deadline box 10 is installed on the seabed or riverbed as shown in FIG. 2, and forms a temporary deadline.
That is, one of the openings (that is, the lower opening 14) of the temporary closing box 10 is placed on the river bottom 21 and pressure is applied from above, so that the root portion 16 having a predetermined length is pressed into the ground, Four steel plates 11a, 11b, 12a, 12b
The upper section 15 cuts off the water of the river and removes the water in the cutoff, so that a construction space for constructing a structure is formed here.

Next, a method of constructing a continuous underground wall using the temporary closing box 10 will be described with reference to FIGS. First, the work pier 41 is constructed in the construction area,
From here, the predetermined length of the temporary closing box 10 is driven into the river bottom 21 using a vibro hammer (not shown) or the like. Next, water in the temporary closing box 10 is removed to form a work space therein, and the drilling machine 40 is arranged at a predetermined position on the work pier 41. Then, the river bottom 21 surrounded by the temporary deadline box 10 is sequentially drilled by the auger 40a of the drilling machine 40 to form a plurality of continuous soil cement columns. A steel section is erected to form the leading portion 30 of the continuous underground wall. The leading portion 30 is formed such that its upper end is located deeper than the lower end of the root portion 16 as shown in FIG. After constructing the preceding part 30, a dotted line 1 in FIG.
The temporary closing box 10 is moved to the position indicated by 0. At this time, one end of the leading part 30 is located in an area to be closed by the moved temporary closing box 10. Then, a trailing portion 31 of the continuous underground wall is formed inside the temporary closing box 10 in the same manner as the preceding portion 30, and its end is placed in the leading portion 3.
0 and joined together. A continuous underground wall can be constructed by sequentially repeating the step of moving the temporary deadline box 10 and the step of constructing the elements of the continuous underground wall. In addition, the upper end of the constructed continuous underground wall may be appropriately protected with a dowel 32 so as not to be damaged.

[0014]

The temporary closing box according to the present invention comprises a shell material forming a closed space as a through hole extending in one direction therein, and the shell material is formed so that the through hole communicates from the riverbed or the seabed to the water surface. When a predetermined length is inserted into the through hole, a temporary closing work can be formed, whereby the inside of the through hole can be used as a construction space for constructing a structure. Therefore, it has become possible to greatly reduce the time and labor for constructing a temporary closing work, which has conventionally been performed by laying steel sheet piles one by one.

In the method for constructing a structure according to the present invention, a temporary closing box having a closed space as a through hole in a shell material is inserted into the bottom of a river or the seabed for a predetermined length, and water in the closed space is removed. The deadline is to use the closed space as a construction space for constructing structures on the bottom of the river or the sea. Therefore, in the construction of a structure in a river or the sea, the amount of work for installing and removing temporary deadlines can be significantly reduced as compared with the conventional case.

Furthermore, the temporary deadline box of the present invention can be easily removed quickly, so that even if the river suddenly increases in water at the time of construction, if the temporary deadline box is removed, the required cross-sectional area of the flowing water can be reduced. Can be secured promptly, and the flow inhibition rate can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a temporary closing box of the present invention.

FIG. 2 is a cross-sectional view showing a temporary deadline box installed at the bottom of a river.

FIG. 3 is a plan view of a continuous underground wall being built in a temporary deadline box.

FIG. 4 is a sectional view taken along a dashed line IV-IV in FIG.

FIG. 5 is a side view showing a construction state of a continuous underground wall construction using a temporary deadline box.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Temporary cut-off box 11a, 11b, 12a, 12b Steel plate (shell material) 16 Root portion 20 Water surface 21 River bottom 30, 31 Continuous underground wall (structure)

Claims (2)

[Claims] 1. A shell material that forms a closed space as a through hole extending in one direction therein, and the shell material is connected so that the through hole of the shell material communicates from the bottom of a river or the seabed to the surface of water. A temporary deadline box wherein a predetermined length of root is inserted, whereby the inside of the through hole can be used as a construction space for constructing a structure. 2. A temporary deadline box having a closed space as a through-hole inside a shell material is inserted into a bottom of a river or a seabed for a predetermined length, and water in the closed space is shut off. A method for constructing a structure, wherein the method is used as a construction space for constructing the structure on the bottom or the sea floor.