JPS58110724A - Towage and settlement of steel cell - Google Patents

Abstract

PURPOSE:To effectively tow and settle a steel large-sized cell without the use of a crane ship by a method in which an air-tight bag is packed into the steel cell and then the steel cell is towed. CONSTITUTION:Air tight bags 5a and 5b plurally divided toward the center line direction side of a steel cell at least are housed into the cylindrically formed or assembled steel cell 1. Air is then charged into the bags to float the steel cell on the water surface, and the steel cell floated while adjusting the packing rate of the air into the air-tight bags is towed and settled while controlling the attitude of the cell. Thus, the need for a large-size crane ship to install the steel cell is eliminated, and therefore, steel cells from usual size to extra-large size can be settled by using only a small-size working ship.

Description

[Detailed description of the invention] The present invention relates to a method for towing and sinking steel cells.

Generally, so-called steel cellulose is used for seawalls of reclaimed land, breakwaters, etc.

This steel cell construction method conventionally uses a single sheet of steel to form a steel sheet cell into a cylindrical shape, or a large number of steel sheet piles arranged vertically and connected to each other. Using steel cells such as steel pipe cells arranged vertically and connected to each other and assembled into a cylindrical shape, these cells are lowered to the bottom of the water using a crane, and are lined up and hammered into the desired positions one after another. It is being filled with sand to form a seawall or embankment body.

However, in recent years, reclaimed seawalls, breakwaters, and levees have been required to be constructed in deep water areas, and with this, the steel cells used for steel cells are also becoming larger, especially steel cells with a diameter of several tens of meters. The steel pipe cell developed as a steel pipe cell requires an extremely large crane to lift it, and it costs a lot of money to construct and use a crane ship, so these costs account for a large proportion of the overall construction work. There was an unavoidable drawback.

The main purpose of the present invention is to provide a method for towing and sinking such large steel cells without using a crane ship, and the gist thereof is to provide a method for towing and sinking such large steel cells without using a crane ship. Alternatively, an airtight bag divided into a plurality of parts at least in the direction of the center line of the steel cell is housed in the assembled steel cell, the airtight bag is filled with air, and the steel cell is floated on water and towed. The method for towing and sinking steel cells includes controlling the attitude of the floating steel cells by adjusting the air filling ratio in each airtight bag.

Next, an example in which the present invention is applied to the towing and sinking of steel pipe cells is shown in the drawings (I2).

This steel pipe cell 1, which is a steel pipe cell 111 in the figure, has a large number of steel pipes i12.2 arranged vertically, each connected by joints 3a and 3b, and assembled into a cylindrical shape.
are doing. Use joints 3a and 3b that can fit into the bean trough and slide to the upper F, and temporarily secure joints 3a and 3bll during moving work such as towing or sinking.
At the time of driving, the temporary d-me is released and 8 steel! 2.2
...I'm using Jl), which allows me to type in every time.

M/-1 This steel pipe cell 1 has an auxiliary guiding frame 4 at its F lower end.
a, 4b are attached to maintain the desired top surface shape of the steel pipe cell 1.

The steel pipe cell 1 configured as described above is assembled in advance on a lumen inside one nick, and then floated on water and towed. Prior to towing, an airtight bag 5a is placed inside the steel pipe cell 1.
, 5b are stored. The airtight bags 5a and 5b are formed of an airtight sheet made of rubber or synthetic resin or an airtight cloth membrane, and divide the inside of the tube 1 into two in the center contraction direction, and are filled with air to the maximum. A steel pipe formed in a size and shape that can be expanded all at once into the steel pipe cell 1 is used.

Further, an auxiliary airtight bag 6 is housed inside each steel pipe 2.2 that constitutes the steel pipe cell 1.
... is all steel! ! They are housed in two or every other steel 112 or every few steels 112 in an even arrangement over the entire circumference.

The auxiliary airtight bags 6, 6, . . . are provided by identifying a provisional bag 117 at the upper end of each steel pipe 2.degree. 2 and inserting it therein.

In this way, the airtight bag 5615b is placed inside the steel pipe cell 1.
An auxiliary airtight bag 6 is housed in the steel pipe 2, and only both airtight bags 5a and 5b are filled with air, and when they are fully inflated, they are allowed to play with water and float on the water surface.

At this time, the entire interior of the steel pipe cell 1 is covered with an airtight bag 5a.
, 5b, and since the height of the steel pipe cell 1 is larger than its diameter in most cases, it is floated horizontally as shown in FIG. The steel pipe cell 1 thus floated is towed to the installation site using a tugboat 8.

Installation! After reaching the site, first, the posture of the steel pipe cell 1 is changed from horizontal to vertical on the water surface at the installation location, but this conversion involves removing air from the airtightness 615b on the lower side.
As a result, the steel pipe cell 1 is floated by the buoyancy of the airtight bag 5a on the upper side, so that the lower side sinks and is oriented vertically.

Thereafter, the air in the upper airtight bag 5a is gradually removed and the bag is allowed to sink. At this time, air is injected into the auxiliary airtight bags 6.6... in each steel pipe 2.2..., and the air inside is adjusted for each auxiliary airtight bag 6. Adjusting the vertical inclination of the entire cell 1 will stabilize the posture at 11 o'clock.

After adjusting the posture in this way and gradually removing the air from the airtight bag 5a to lower the steel pipe cell 1 to the desired position,
The airtight bags 5a, 5b, and 6 are taken out, and each steel pipe 2.2... is placed in the bottom of the water in the same manner as before, and then filled to form a sea wall or breakwater.

In the above-described embodiment, the auxiliary airtight bag 6 is used to adjust the posture during subsidence, but instead, as shown in FIG. It is also possible to use a means for adjusting the posture that does not rely on such air injection and exhaustion, such as a crane.

In addition, although the above-mentioned embodiment describes a steel pipe cell, the airtight bags 5a and 5b can be similarly filled with i4i for towing and sinking steel cells such as so-called steel plate cells and steel sheet pile cells.
Furthermore, it is obvious that it can be used not only for the installation of particularly large steel cells, but also for installations of ordinary sizes.

The method for towing and sinking steel cells of the present invention is configured as described above, and by loading an airtight bag into the steel cell and towing it, it is particularly suitable for transporting ultra-large steel cells for deep water use. Large crane ships and large barges become unnecessary.

In addition, by controlling the attitude of the steel cell by extracting air from the airtight bag during the installation, the steel cell is placed in the W4WII, which eliminates the need for a large crane ship for installing the steel cell, eliminating the need for a small crane ship. This enabled the work to sink everything from normal-sized steel cells to superhuman-sized steel cells using only the same work boats, and the cost of sinking equipment was significantly reduced. be.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a plan view of a steel cell, FIG. 2 is a longitudinal sectional view of a steel cell with an airtight bag housed in it, and FIG. 3 is a towed state. 1 and 4 are vertical cross-sectional views of the sinking process, and FIG. 5 IA is a vertical cross-sectional view of another example of sinking. 1...Hagane II Hill, 2...Joint, 4a
, 4b auxiliary airtight bag.

Claims (1)

[Scope of Claims] 1. A plurality of divided airtight bags are housed in a steel cell formed or assembled into a cylindrical shape at least in the direction of the center line of the steel cell, and air is pumped into the airtight bag. A method for towing and sinking a steel cell, which is characterized by floating the steel cell on water, towing it, adjusting the proportion of air filling into each airtight bag, and controlling the attitude of the floating steel cell while sinking the cell. .