JPH0441206B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Technical Field The present invention is a method of constructing a deep-water quay or seawall in the form of a pier suitable for berthing ships by using the hulls of large tankers or the like that are no longer needed. It is related to.

(b) Background technology Recently, due to the increase in the size of ships and the location, many pier-type quays are constructed offshore in deep water and on soft ground.

However, conventionally, when constructing this type of quay, a revetment is constructed using a double cofferdam structure using steel pipe sheet piles, etc., or a mound is constructed using a large amount of rubble, and then a concrete caisson is installed on top of the revetment. However, the steel pipe sheet pile construction method is uneconomical on quay walls in deep water because the cross-sectional load increases due to external forces and stress, and it is also extremely difficult to construct. In addition, the rubble mound construction method involves piling up rubble to a high height and then installing a wall-height reinforced concrete caisson on top of it.The leveling accuracy of the mound is poor in deep water, and the fabrication of wall-height concrete caissons is difficult. It was extremely troublesome and uneconomical in terms of construction costs.

(c) Disclosure of the Invention In view of the above-mentioned conventional problems, the present invention involves cutting and processing the belly of a large tanker, etc., which has been decommissioned at a factory, into a desired size, and then constructing a wharf. This paper proposes an economical method of constructing quay walls that can be installed at individual locations to form pier-style quay walls that are easy to manufacture and construct, and that can be constructed quickly.

Examples of the method of the present invention will be described below with reference to the drawings.

(D) Example 1 is a part of an abandoned large tanker whose bottom and side are relatively parallel, cut out in a factory, etc. For example, the width is 40 to 60 m, the height is 20 to 35 m, and the length is 160 m to 160 m.
The scrapped hull is a large block with a length of 240 m. On the upper surface of the scrapped hull 1, a large number of support piles 2 such as steel pipes are installed in the length direction of the scrapped hull 1, which will be moved toward the sea side when the scrapped hull 1 is sunk on the seabed. One or more rows (for example, one row on the outer edge and one row on the longitudinal bulkhead on the sea side, as shown in the figure) are erected and fixed. In addition, a sheet pile wall that will become the retaining wall 3 is erected from the center of the top surface of the scrapped hull 1 toward the land side (for example, on the longitudinal bulkhead on the land side as shown in the figure), or is cut out from a concrete caisson or the scrapped hull. Install and fix other parts.

All of the structures constructed in this way are built on land and towed to the quay construction site.

Therefore, first, depending on the condition of the seabed ground where the quay is being constructed, a low foundation 4 is constructed of rubble as necessary. Next, the above-mentioned structure is placed on the foundation 4, and the inside of the scrapped hull 1 is filled with earth and sand 5. In addition, earth and sand 6 is backfilled on the land side back of the scrapped hull 1 and on the back of the retaining wall 3 to stabilize the scrapped hull 1.

Next, reinforcing bars are erected using the support piles protruding above the sea surface, and the backfill earth 6 is placed above the scrapped hull 1.
Concrete slabs 7, etc. are constructed and installed so that they are flush with the surface, and the pier-style quay wall is completed.

8 is a cargo handling crane that runs on rails 9 laid on the slab 7. In addition, if the load of the crane 8 is extremely large, it is also possible to make the above-mentioned support piles 2 continuous.

In addition, when this structural type is used as a seawall, the above-mentioned support piles 2 are not required, and the retaining wall 3 can be placed at any position where the end pressure of the scrapped hull 1 is within the allowable bearing capacity of the foundation ground. It is also possible to reduce the construction cost of the foundation by installing it.

(e) Effects of the invention The method of the present invention is achieved as described above, and its advantages are as follows.

(a) Since support piles and retaining walls are erected on the top of the sunken large abandoned ship, the length of these support piles can be relatively short even on quays in deep water.

(b) Since the overload on the sea side of the sunken scrap hull is small, a stable quay with equalized edge pressure can be constructed, and the cost of ground improvement for the foundation can be reduced.

(c) Since the structure consisting of the scrap hull, supporting piles, and retaining walls is manufactured on land, processing accuracy is high, and compared to concrete caissons, it is less affected by sea conditions and weather, reducing the manufacturing period. The cost is low, and since a large scrap hull is used, the construction period can be significantly shortened.

(d) Even for deep-water quays, it is possible to reduce or eliminate the need for rubble on the seabed foundations, which is advantageous from the standpoint of marine pollution prevention and ship navigation.

(e) Compared to concrete caisson embankments, etc., the embankment length is longer, so it is advantageous against uneven settlement of the foundation ground, and there is no need to take measures to strengthen the overlying structures (e.g. cranes).

[Brief explanation of drawings]

The figure is an explanatory diagram showing an example of a quay constructed by the method of the present invention. Explanation of symbols: 1 - Scraped ship hull, 2 - Support pile, 3 - Retaining wall, 4 - Seabed foundation, 5 - Filling earth and sand, 6 - Back filling earth and sand, 7 - Slab, 8 - Crane, 9 - Rail.

Claims (1)

[Claims] 1. Constructed by erecting and fixing a large number of support piles in one or more rows in the length direction on the upper surface of a discarded hull of a large tanker, etc. that is no longer needed, and also erecting an earth retaining wall made of sheet piles, etc. The structure that was
After being towed to the location where the quay is to be constructed and deposited on the undersea foundation, the scrapped hull is filled with earth and sand, and then earth and sand is backfilled into the back of the scrapped hull and the back of the retaining wall, which will be on the land side. and then constructing and installing a concrete slab on the support piles protruding above the sea surface.