JPS60144425A - Caisson for multi-stage stacking work - Google Patents

Abstract

PURPOSE:To quickly and exactly control a caisson by using a system in which water is separately charged to or discharged from spaces chambers provided at the four corners of the caisson body and many compartments leading to each other in the central part. CONSTITUTION:A caisson body 20 is settled to a given depth by charging water into each compartment 25 through a water supply and discharge pipe 29. When settlement work for emergency refuge and setting during the bad weather is made, water is charged into each of enclosed chambers A-D through a water supply and discharge pipe 27 for fine regulation of boyancy, and the caisson body 20 is settled to a given depth. When the caisson body 20 is inclined or restored to the original attitude, the amounts of water in the chambers A-D are separately adjusted. When the caisson body 20 is refloated, the water in the chambers A-D is discharged to float it up to the depth intially set.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a multi-stacked caisson which is mainly used in the lower stage of a multi-stacked caisson embankment, and which has an improved structure for controlling its buoyancy and attitude.

(Prior art) Generally, the lower caisson of a multi-tiered caisson embankment is installed submerged in water, and in recent years a technology has been developed in which it is connected to the upper caisson while suspended in water. It has become necessary to accurately control the buoyancy and attitude.

As shown in Fig. 1, the conventional caisson for multi-tiered stacking has a cylindrical float 11 protruding from the upper surface of the hollow caisson body 10, and water is injected into the caisson body 10 to increase buoyancy. Adjustments are being made to keep the float 11 horizontal.

However, in such conventional multi-tiered caissons, there is no partition wall in the caisson body 10, or even if there is a partition wall, water holes are formed in the partition wall, and the buoyancy can be adjusted by injecting water into the entire caisson body. As a result, the movement of water inside the caisson made it unstable, making it difficult to control its attitude using floats alone, and even if it could be stabilized, the diameter of the float would be significantly large, making it impractical.

(Object of the Invention) The present invention has been made to solve the problems of the prior art as described above, and aims to provide a multi-tiered caisson that can be stably controlled underwater.

(Structure of the invention) However, the structure of the present invention for achieving the above object is as follows.
In a multi-stacked caisson comprising a caisson body having a plurality of interconnected compartments separated by grid-like partitions and a float disposed on the upper part of the caisson body, the caisson body has four corners of the caisson body. The part is provided with a sealed chamber separate from the central part, and the floats are respectively disposed on the upper surface of the sealed chamber, and an inlet and drain pipe for supplying water to the sealed chamber is inserted into the float, and the caisson is connected to the caisson. Rough adjustment of buoyancy is performed by injecting water into the compartments other than the sealed chambers at the four corners of the main body, and fine adjustment of buoyancy and attitude control are performed by injecting water into each of the compartments at the four corners. This is a multi-tiered caisson.

(Example) Next, an example of implementing the present invention will be described with reference to the drawings from FIG. 2 onwards.

FIG. 2 is a longitudinal sectional view of a caisson according to the present invention, and FIG. 3 is a sectional view taken along the line II in FIG. This caisson body 20 has a plurality of substantially parallel spaces arranged vertically and horizontally! 1121, a plurality of compartments 25 are connected in a rectangular shape by a lower concrete plate 22, an upper concrete plate 23, and a surrounding wall 24.

The partition walls between these compartments 25, 25..., except for the four corners of the caisson body, have communication holes 26, 26...
... are formed, but the four compartments 25a, 25a, etc. located at each of the four corners are different from the other compartments 25.
．． 25 Sealed rooms A, B, C, D isolated from...
It consists of Note that 26a in the figure is a communication hole formed in the partition wall within the sealed chamber A-D.

3- The upper surface of the four corners of this caisson body 20, that is, each sealed chamber A-
At the top of D, floats 28°28...
・is installed. This float 28, . 28・
.
The lower ends of the caissons pass through the upper concrete plate 23 of the caisson body 20 and hang down to the bottoms of the sealed chambers A to D.

On the other hand, on the upper surface of both edges of the caisson body 20, a water injection pipe 29 for water injection into the compartments 25, 25, . 23 and hangs down from the bottom.

In order to control the buoyancy and attitude of the multi-stacked caissons constructed in this manner, the compartments 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25 , .
Water is poured into the tank using the water filling pipe 29, and the water is submerged to a certain depth.

When performing sedimentation work such as sedimentation evacuation in bad marine weather conditions or sedimentation due to tiered loading, water is injected into each sealed room A-D using the water injection pipe 4-27 to increase buoyancy. Make fine adjustments and let it sink to the desired depth as shown in Figure 4 (b). Also, if you want to tilt your posture or return a tilted object to a horizontal position, you can do this by adjusting the amount of water in each sealed chamber A to D separately.

To further re-float, the water in each of the sealed chambers A to D is drained to float to the initially set depth.

(Effects of the Invention) The present invention is constructed as described above, and has a closed chamber isolated from other parts formed in the four corners of the caisson body, and a large number of compartments in the central part that communicate with the closed chamber. By making it possible to separately inject water into the central part, the buoyancy is adjusted to a certain level by injecting water into the center, and then by injecting a small volume of water into each sealed chamber, sinking/floating and attitude control are performed. These controls can be performed quickly and accurately, and since the sealed chambers in the center and four corners are isolated, there is no significant movement of water within the caisson body, improving stability. was achieved.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a conventional multi-tiered caisson, FIG. 2 is a vertical cross-sectional view of an embodiment of the present invention, and FIG.
4(a) and 4(b) are longitudinal sectional views for explaining the operation of this embodiment. 20... Caisson body, 21... Bulkhead, 22... Lower concrete plate, 23...
・・Upper concrete plate, 24・・・・Surrounding wall, 2
5.25a... Compartment room, 26.26a...
...Communication hole, 27...Filling and draining pipe, 28...
...Float, A, B, C, D... Sealed room. Patent applicant: Pentayo Construction Co., Ltd. 7-

Claims (1)

[Claims] A caisson for multi-tier stacking comprising a caisson body having a plurality of interconnected compartments separated by lattice-like partition walls and a float disposed on the upper part of the caisson body, the caisson body having four corners. The section is equipped with a sealed chamber separate from the central section, and the flow 1 is provided on the upper surface of the sealed chamber.
. . . , respectively, and insert an inlet and drain pipe for injecting water into the closed chamber into the float, and inject water into the compartment except for the closed chambers at the four corners of the caisson body to roughly estimate the buoyancy. A caisson for multi-tiered stacking, characterized in that fine adjustment of buoyancy and attitude control are carried out by adjusting and injecting water into each compartment at the four corners.