JPS61286417A - Cofferdam structure - Google Patents

Abstract

PURPOSE:To shorten the term of construction and need no sea-bottom dredging after a cofferdam is removed, by a method wherein a ballast can be contained in a floating body, and wherein piles are housed on the side sections of the floating body, and wherein the cofferdam is constructed to be hung from the piles. CONSTITUTION:A floating body 1 is taken in tow to the site of a cofferdam, and a ballast is contained in the floating body 1 there, and the floating body 1 is sunk. After that, piles 2, 2a are supported by the side sections of the floating body 1, and at the same time, the piles are driven to the sea-bottom, and the floating body 1 is served as a supporting guide when the piles are driven. When removed, the piles 2, 2a are respectively taken out of the ends in order, and after the work for taking out is completed, the floating body 1 is made to float and is moved to the following construction site. As a result, the construction is facilitated, and the term of the construction is shortened, and the removal can be facilitated, and so the piles can be used repeatedly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a temporary coffering structure such as an embankment that dams water around the structure or foundation prior to construction of the structure or foundation underwater.

[Conventional technology]

Conventionally, temporary cofferdam structures such as embankments installed on the sea surface are
As shown in the cross-sectional view, the steel sheet piles (10
2) It is constructed by burying earth and sand (103) between (xoza).

[Problem that the invention seeks to solve]

However, as for the construction work, first the steel sheet pile (102)
(xoza) and these steel sheet piles (10
2) After putting a certain amount of earth and sand (103) between (102m) and fixing the tie rod (101) between them,
It is constructed by further adding earth and sand (103).

On the other hand, when removing the temporary cofferdam, the steel sheet pile (102)
After digging out the earth and sand (103) between (xoza) and removing the tie rod (101),
oa) and then the steel sheet pile (102) (lo
2a) Remove - and finally remove the temporary cofferdam (100
) The remaining soil (103) was dredged and completed.

In this way, conventional civil engineering work related to the enforcement and removal of temporary cofferdams involves many construction procedures and requires a long construction period. There were also problems such as the risk of marine pollution.

The present invention has been made to solve the above problems, and it is possible to significantly reduce the civil engineering work and shorten the construction period when constructing a temporary cofferdam underwater, and also eliminate the need for seabed dredging after the temporary cofferdam is removed. The aim is to provide a new temporary cofferdam structure that is capable of

[Means for solving problems]

FIG. 1 shows the structure of a temporary cofferdam structure according to the present invention, and the structure has a floating body (1) and a pile (2) (2a).

The floating body 11) is a structure capable of accommodating ballast such as seawater, and preferably has an appropriate length depending on the area in which the temporary cofferdam is to be attached.

The pile (2) (2a) is a steel pile such as a steel sheet pile that is supported and stored on the side of the floating body (1) so as to be able to rise and fall, and is suspended from there and driven into the seabed.

[Function] The above temporary cofferdam structure is used as follows. First, the floating body (1) is towed to the temporary cofferdam site, and there the floating body (1) is towed to the temporary cofferdam site.
1) Place the ballast inside and let it sink. Then, while supporting the pile (2) (21L) on the side of the floating body (1), these are driven toward the seabed. Pile like this (
2) The floating body (1) located between the piles (2a)
) It can be used to transport C2 &>, and it will support and guide them during driving, and after driving is completed, it will become the same content as earth and sand packed between piles (2) (2Jk). be. However.

When removing these, the procedure described above is reversed, and after the floating body (1) has surfaced, it will be moved to the next construction site.

〔Example〕

FIG. 3 shows an embodiment of the temporary cofferdam structure of the present invention. In the figure i, the present invention consists of a floating body αq and a pile (E)
It is composed of η.

The floating body uses the hull of a ship that is no longer needed, and is equipped with a ballast tank that can store a large amount of seawater and a system for absorbing and draining seawater. In addition, the pile (7) (goods) is stored on both sides of the floating body αO, and a storage guide part αla is installed to serve as a guide when driving the pile mQη. .

Said pile (ho)? Each of these is made of steel sheet piles, and a plurality of these sides are connected so that they can slide relative to each other. These piles (1) 91 are stored in a hanging state on both sides of the floating body part by the storage guide parts α1) and (6).

The structure of this embodiment is towed while floating to the temporary cofferdam site, and there, seawater is filled as last water into the ballast tank of the floating body αG using suction and drainage equipment,
The floating part is allowed to sink to the bottom. After the inside of the ballast tank is completely filled with seawater, a pile driver is installed on both sides of the floating uG, and the pile (7) stored in (2) is installed in the storage guide section α as shown in Figure 4. ? Starting from the end, the bottom of the ocean (loo
) When driving in the pile to complete the construction or remove it, pull out the pile ferrules (property) one by one from each end, and after completing this pulling out, drain the seawater from the ballast tank and remove the floating structure. Let αO float. Then move it to the next construction site.

〔Effect of the invention〕

As explained above, according to the structure of the present invention, when attaching it to the seabed, only the steps of driving/pulling out parasting and piles are required, so construction is easy (
This has the excellent effect of shortening the construction period and also eliminating the problem of marine pollution. Furthermore, as mentioned above, it is easy to install and can be moved easily, so it has the advantage of being able to be used many times.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing the configuration of the present invention, Fig. 2 is a schematic diagram showing the attached state of a conventional temporary cofferdam structure, Fig. 3 is a perspective view showing an embodiment of the present invention, and Fig. 4 is FIG. 2 is a schematic diagram showing an attached state of this embodiment. In the figure, (1) (10) are floating bodies, (2) (2a) (
20) (21) indicates pile, (11) (12) indicates storage guide section, (100) indicates seabed percentage, (101) indicates tie rod, (102) (10mm) indicates steel sheet pile, and (103) indicates earth and sand. . Patent applicant Nippon Kokan Co., Ltd. No. 1 Fig. 12 Fig. 3 Fig. 4

Claims (1)

[Claims] A floating body that can accommodate ballast inside and a floating body that can accommodate ballast inside. Stored on the side of the floating body and suspended from it A temporary cofferdam characterized by having a pile Structure.