JPS62148706A - Construction of quaywall by utilizing scrap ship - Google Patents

Abstract

PURPOSE:To make the construction of a quaywall easier by a method in which many support piles are erected on the upside of a scrap ship and also a sheathing wall of sheet piles is provided. CONSTITUTION:Many support piles 2 are erectly provided in the longitudinal direction on the upside of a scrap ship 1, and a sheathing wall 3 of sheet piles, etc., is also provided to construct a structure. A foundation 4 is then formed of rubble, filling soil 5 is packed into the scrap ship 1, and the back-filling of soil 6 is applied to the back side to be the land side of the ship 1 and also on the back side of the wall 3. Concrete slab 7 is then placed on the piles 2 and the wall 3. Since the piles 2 and the wall 3 are erectly provided on the upside of the scrap ship 1, shorter the length of the piles 2 and wall 3 can be used even for a quaywall at deeper depths, making the construction of the quaywall easier.

Description

[Detailed description of the invention] (a) Technical field The present invention is a method of constructing a pier-type deep-water quay or revetment suitable for berthing a ship by using the hull of a large tanker or the like that is no longer needed. It is related to.

(B) Background Art Recently, pier-type quays are often constructed offshore in deep water and on soft ground due to the increasing size of ships and location considerations.

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 conventional problems mentioned in 1), the present invention has been developed by cutting out the hull of a large tanker, etc., which has been decommissioned at a factory or the like, to a desired size and adjusting it. This paper proposes an economical method of constructing a quay wall that is easy to manufacture and construct and can be rapidly constructed by installing it at the location where the quay is being constructed to form a pier-type quay wall.

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

(d) In Example 1, the bottom and side of a disused large tanker were cut out in a factory, for example, with a width of 40 to 60 mm.
m, height is 20 to 35 m, and length is 160 to 240 m.The L side of the scrap hull 1 has a length that is 20 to 35 m high and 160 to 240 m long. A large number of support piles 2 such as steel pipes are arranged in one row or in multiple rows (
For example, as shown in the figure, one row on the outer edge and one row on the longitudinal bulkhead on the sea side) are installed and fixed upright. In addition, a sheet pile wall that will serve as the earth retaining wall 3 is erected closer to the land side than the center of the L-H surface of the scrapped hull (for example, on the longitudinal bulkhead on the land side as shown in the figure), or a sheet pile wall is erected from the concrete caisson or the scrapped hull. Install and fix the other cut out parts.

All the structures assembled in this way are RL
The ship was manufactured in the same building and towed to the quay construction site.

Therefore, first, depending on the condition of the seabed ground where the quay is being built, a low foundation 4 is constructed using rubble as necessary! Dear 8th,
The above structure is sunk into the foundation 4-H, and the inside of the scrapped hull 1 is filled with filler sand 5. Further, the back part of the abandoned ship 1 on the land side and the back of the earth retaining wall 3 are backfilled with earth and sand 6 to stabilize the abandoned ship 1.

Next, reinforcing bars were set up using the support piles listed in +i77 that protruded above the sea level ↓2, and a concrete slab 7 etc. was constructed and installed above the scrapped hull 1 so as to be on the same level as the backfill earth 6.
This completes the pier-style quay.

Reference numeral 8 denotes a cargo handling crane that travels on rails 9 laid on the slab 7 described in 1-. In addition, if the load of the crane 8 is extremely large, it is also possible to make the support piles 2 described in ji7 continuous.

In addition, when using the single structure type as a revetment, the above-mentioned support piles 2 are not required, and the earth 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 implemented as described in 1), and its advantages are as follows.

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

b) Since the overload on the sea side of the sunken abandoned ship 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, support piles, and earth 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 foundation, which is advantageous from the viewpoint of marine pollution prevention and ship navigation.

e) Compared to concrete caisson embankments, etc., the embankment body length is longer, so it is advantageous against uneven settlement of the foundation ground, and there is no need to take measures to reinforce the subsidence of superstructures (for example, 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. Code explanation

Claims (1)

[Claims] It is 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 disused large tanker, etc., which has been cut out from the belly of the ship, and by erecting an earth retaining wall made of sheet piles, etc. After towing the structure to the quay construction site and sinking it on the seabed foundation, filling the abandoned ship with filler earth and sand,
Next, earth and sand is backfilled on the back side of the scrapped hull on the land side and on the back of the retaining wall, and then a concrete slab or the like is constructed and installed on the support piles that protrude above the sea surface. The quay construction method used.