JPS6131515A - Method of installing hull type caisson - Google Patents

Abstract

PURPOSE:To reduce a cost, by a method wherein, after filling sand, having the same weight as that of upper concrete placed on the deck of a caisson, is charged in a hull type caisson, the caisson is sunk so that the upper concrete is submerged. CONSTITUTION:The inside of a center tank 16 and wing tanks 17 and 18 of a hull type caisson 11 is filled with a filling sand 19 for balance having the same weight as that of upper concrete intended to be placed on a deck 12. Thereafter, upper concrete 20 and breakwater concrete 21 are placed on the deck 12. Sea water is then poured into the caisson 11 through openings 13 of the deck 12 by means of openings 22 of the upper concrete 20 to seat the caisson 11 on rubble- mound 23 so that the upper concrete 20 is submerged down to lower than an average high tide waterline H.W.L. After the filling sand 19 is further charged through the openings 22 and 13 to replace sea water in the caisson 11 with the filling sand, underwater concrete 20a is placed in the openings 22.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for installing a ship's caisson, which is applied to the construction of underwater structures such as breakwaters, seawalls, seawalls, and embankments.

(Prior art) Figure 3 shows the implementation of the conventional ship caisson breakwater installation method, in which seawater is injected into the ship's caisson (1) and the ship's caisson (1) is mounted on a rubble mound on the seabed. (21
The opening (4) is then made in the deck (3).
Filling sand (5) is poured into the hull (1) to replace seawater, and then upper concrete (6) is placed on the deck (3).

(Problems to be Solved by the Invention) In the conventional construction method, the deck (6) is placed at the mean high tide water line H, W so that it is easier to place the upper concrete (6).
Since the rubble stone mount l' (2) is constructed so as to be located above the mean high tide water line in the steel hull (1), the temperature sensitive part (4) which produces the temperature sensitive part (-) near the mean high tide water line in the steel hull (1) Since the caissons corrode quickly, problems will arise in the service life of the hull caissons.

As a countermeasure for this, it is necessary to pour corrosion-preventing concrete (7) in the temperature-sensitive portion (m), resulting in high costs.

(Means for Solving the Problems) The present invention was proposed in order to solve the above problems. Add filling sand,
The method of installing a hull caisson is characterized in that an upper concrete is then placed on the deck, and then the hull caisson is sunk so that the upper concrete portion is submerged in water.

(Function) As described above, in the present invention, before the hull caisson is sunk, filling sand for balance is placed in the hull in advance in an amount corresponding to the weight of the upper concrete to be cast on the hull deck. Then, the upper concrete was placed on the deck, and then the hull caisson was sunk so that the upper concrete part was submerged in water, so a temperature-sensitive part was created in the steel hull caisson as in the conventional case. Things will go away.

Therefore, according to the present invention, it is not necessary to pour corrosion-resistant concrete into the temperature-sensing part of the hull caisson, reducing the installation cost of the hull caisson, and by eliminating the temperature-sensing part, the service life of the hull caisson is greatly extended. increase

(Example) The present invention will be described below with reference to the illustrated embodiments.

On the deck of the hull caisson (Ll), the bow of the hull,
A large number of openings (13) are provided in the stern direction, starboard direction, and port direction.

(14) is a vertical bulkhead in the hull caisson α1 supported by the intermediate frame 09, and the center tank (161) and wing tank (17+α barrels are divided by the vertical bulkhead (I) and the intermediate frame a). There is.

Fill the center tank (16) and wing tank αη with filling sand α for balance to match the weight of the upper concrete scheduled to be cast on deck α2.

Balance river sand (1
9α) is filled into the wing tank (I7) on the opposite side from where the breakwater concrete is placed.

Next, the deck (upper concrete on top of 12+) (2
0) and pour concrete aυ. At this time, an opening (c) is provided at the same location as the opening Q3+ of the deck α2.

In addition, with the conventional construction method, the breakwater concrete 0υ requires concrete, etc. to be poured into the caisson when the hull caisson is sunk on site. However, with this method, the breakwater concrete 0υ is pre-constructed before the hull caisson is sunk, so on-site construction is omitted, reducing construction costs and construction time.

Hull caisson 01) for which preliminary construction has been completed as mentioned above.
The upper conch') -) (20+ is the average high tide water line H
The ship will be towed to the sea to a rubble mound (support) on the seabed built to be submerged below 1W,L.

The hull caisson (11) thus arrived at the planned sinking location.
Inside the upper concrete (Deck α2) opening (through 221), seawater was poured into the upper concrete (Deck α2) and the hull caisson 01) was placed on top of the rubble mound (C)).
20) will be submerged below the mean high tide water line I (, W, L).

Next, seawater is poured into the opening (221 (from 131 to filling sand σ9)) to replace the seawater in the hull caisson I.

After the filling sand α9) has been added, the upper concrete 0θ
Underwater concrete (20α) is poured into the opening (2), and the hull caisson 0υ is thus allowed to sit on the rubble mound (c) without creating a temperature-sensitive part as in the past.

(Effects of the Invention) According to the present invention, as described above, prior to the sinking of the hull caisson, the same amount of filling sand as the upper concrete to be cast on the deck of the caisson is poured, and then the upper concrete is poured into the upper concrete. By placing the hull caisson and then sinking the hull caisson so that the upper concrete part is submerged in water,
There is no temperature-sensitive part in the hull caisson, and therefore, according to the present invention, it is not necessary to place corrosion-resistant concrete, and the construction period and construction cost for installing the hull caisson can be reduced. Also, by removing the temperature sensing part, the service life of the hull caisson is increased.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view of a hull caisson installed by the method of the present invention, Fig. 2 is a longitudinal sectional view showing the state of the hull caisson before sinking, and Fig. 3 is a longitudinal sectional view of the hull caisson installed by the method of the present invention. It is a longitudinal cross-sectional view showing the implementation situation. αυ...hull caisson, a...deck, (13)
Both openings, (Igl...filling sand, kiln...upper concrete, @...opening sub-agent Patent attorney Shige Okamoto 3 other people)

Claims (1)

[Claims] Packing sand of the same weight as the upper concrete to be cast on the deck of the caisson is poured into the hull caisson, and then the upper concrete is poured on the deck, and then the upper concrete part is submerged in water. A hull caisson installation method characterized by sinking the hull caisson.