JPS58199280A - Method of manufacturing steel caisson with deep draft - Google Patents

Abstract

PURPOSE:To enhance efficiency, by manufacturing a steel caisson with such draft in a dock that the caisson can be towed out of the dock and by thereafter towing the caisson to the sea, anchoring it and then assembling remaining parts on the caisson. CONSTITUTION:The lower section of a steel caisson 1 is assembled in a dock 2 to have such draft that the lower section can be towed out of the dock. After the assembly, water is powred in the dock 2 to float the caisson's lower section and tow it out. The towed-out section is put on a semi-submerged barge 4. The barge is then gradually flated upwards to complete the loading of the caisson's lower section. The section is then towed to the sea and coupled by an anchoring chain 6 to a sinker 7 placed on the sea bottom. Remaining blocks 9 are sequentially supplied and assembled to complete the caisson 1. According to this method, the caisson 1 is accurately and efficiently manufactured.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for making a steel cane with deep water.
It is an object of the present invention to provide a method for safely and efficiently operating and economically manufacturing submerged steel caissons that cannot be completed due to the depth of the water in docks and the like.

Steel caissons are installed on the sea, in lakes, rivers, etc., and as they become larger, they tend to become deeper. Conventionally, two methods have been adopted: one is to complete the work at a dock and then be towed to the sinking site, and the other is to temporarily install a simple dock near the sinking site and tow and sink it. The former method is a common manufacturing method, but as mentioned above, it is difficult to make steel caissons in large scale. When the stagnant water is deep, a floater is attached to the steel caisson, and the d-floater becomes quite large, and the d-floater becomes quite large.
1ρ) Floater - floating on the open ocean etc.'f tens of kilos
It is undesirable for safety to tow the vessel over a distance of m or even several hundred km (also, it is not economical because the towing resistance increases steadily). It is also possible to do this with a foreshadowing line suspended from the ground, but this can only be applied at a manufacturing site with well-equipped manufacturing facilities and equipment or fairly close to the submersion site, and the manufacturing site is limited. On the other hand, the latter method of temporarily constructing a simple dock is to construct a temporary dock near the sinking site. equipment costs would be uneconomical and close to land.
As desired, there are few places with deep water, and special underwater excavation work has to be carried out for simple docks, which increases costs, and it is difficult to maintain 4 locations for simple dock facilities in any case. .

In addition, in order to avoid the disadvantages of the conventional method mentioned above (2), for example, as in Japanese Patent Publication No. 5B-36767, it is necessary to construct a semi-finished water tank that can be discharged in a dock, and then to store it in the form of a steel caisson offshore near the sinking site. Then, by using the floating chips of the steel caisson and adjusting the ground reaction force on the seabed and the amount of parast water, the reaction force was reduced by 1. It has also been announced that when the steel caisson is large and the caisson depth is large as mentioned above, it is not easy to move the steel caisson to a deeper water point during its manufacture. Not only is it difficult to transport the materials at the outer site, but the process at the burial site is also unique to Kuniiso.

The present invention was devised after careful consideration in view of the circumstances described above. Caisson 1 is so deep that it would be impossible to discharge it from the dock 2 if it were completed in its dock 2.Therefore, as shown in Figure 1, the above-mentioned steel caisson 1 was discharged from the bottom st dock 2. Assemble it in the dock 2 to the extent that it can stanch. After completing this assembly, water is poured into the dock 2, and the caisson 1 is floated.
Tugboat 3 and other docking equipment as shown in Figure 2? The individual caissons that have been towed out using the caissons are transferred to the semi-submersible deck barge 4 as shown in Fig. Dive to a specified depth and secure it.
In this state, when the 1-ton caisson floating crane is used to lift the caisson from dock 2, the buoyancy of the caisson 1 and the auxiliary lifting of the 70-prong crane will cause the caisson 1 to become shallow and be sufficiently loaded onto the deck barge 4, making it possible for the caisson to become stagnant. be done. That is, the caisson 1 lifted by the floating crane 5 can be easily lifted onto the deck barge 4 in its lifted state, and then the load 31v lifted by the floating crane 5 is gradually lowered. -Caisson;
At the same time, the deck barge 4 is gradually floated to the top of the deck barge 4, and the loading is completed. To the flat noodles of the sea,
The steel caisson was towed by tugboat 3 and unloaded from dock 4 by a method reversing that shown in Figure 3 above. The sinker 1, which is floating on the seabed, is suspended by the VA trade chain 6, and the trade is safely carried out. By this S trade floating crane 5, the remaining blocks 9Y to the caisson 1 are sequentially After preparing and assembling it, - Goonon '76 was completed.

As explained above, by eliminating a series of construction methods based on our uninvented invention, we will be able to install sufficient equipment and equipment at a remote location from the site where the steel caisson is to be deposited. It is clear that it can be manufactured accurately and efficiently since it can be manufactured in 1 piece.Moreover, when transporting this item to the sinking site, it must be taken out of the dock or loaded onto a semi-submersible deck barge and transported at sea. Because it is something that causes a cough, it is difficult to clean it. IIJ1. It is easy to operate, safe to transport at sea, and operates with a purge shaped structure that allows it to be towed, so it is advantageous for efficient transport by tugboat, and is therefore quite remote from the dock and the π-submersion site. It is now possible to transport IAs to construction sites at low cost and without the need for large-scale temporary equipment, and the construction of IAs can be completed at the construction site using a floating crane. In any case, deep steel caissons are economical and safe, and can be produced in a relatively short period of time, so they are industrially highly effective.
It is A.

[Brief explanation of drawings]

The drawings are illustrative of how the present invention is carried out, and are 811
The figure is a slope view showing the steel caisson being constructed at the dock according to the invention, and Figure 2 is a side view of the steel caisson in the docking state.
Figure 43 is a side view of the loading work on the semi-submersible deck purge, Figure 4 is a front view of the ocean towing corridor, Figure 5 is a side view of the moored condition at the sinking site, and Figure 6 is the loading operation by the floating crane. In these drawings, 1 is a steel caisson, 2 is a dock, 3 is a tugboat, 4 is a half-water deck barge, 5 is a floating crane, 6 is a tow rope, and 7 is a sinker. Y indicates. Author: Nippon Kokan Co., Ltd. Inventor: Mura Constitutional procedural amendment (1 negative winter) Showa stomach, June 82, Japan Patent Office Commissioner Kazu Wakasugi Failure 1, case indication 1987 patent application No. 7qt; 4t9 No. 2, invention ζ
Name 01 "Muden...Reikan Cason Kensaku Kasimi 3, Person making the amendment Name of patent applicant related to the case (name) Nippon Steel Tube Co., Ltd. - 1r Company 4, Attorney Uchitani for amendment as per attached sheet

Claims (1)

[Claims] Steel caisson T4 up to the dock I ■ Capable of drinking water at the dock
After the ship is built, it enters the dock and leaves the dock, then a floating crane is used to load the Sunko caisson onto a semi-submersible deck barge, the deck barge tows the ship offshore, the floating crane unloads the ship, and the ship is moored using a sinker. Complete the assembly of the remaining copper caisson.