JP2668184B2 - How to launch a submerged box - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of launching a submerged box for use mainly in a submarine tunnel.

[0002]

2. Description of the Related Art Conventionally, a submerged box, which is submerged on the seabed to form a tunnel, is formed from a length of several tens of meters to a hundred and several tens of meters by using a dock for shipbuilding, a dry dock, etc., and is integrally formed. The boat is towed off the water and submerged at a predetermined launch position.

[0003] There is an example in which a submerged box is manufactured as a composite structure, which is a structure that is considered as a strength member integrating a steel plate and concrete on the outer periphery.
A steel plate is attached to the outer peripheral surface, and the thickness is a concrete structure. Then, the method of manufacturing is performed by turning the opening of the buried box in the horizontal direction, casting concrete between the steel plate on the outer surface and the inner form, and integrating them.

[0004]

According to the above-mentioned conventional method for manufacturing a buried box, a large buried box requires a large manufacturing yard, and a dock for shipbuilding or a dry dock is required on land. And construction in an area where these facilities cannot be reused is extremely expensive.

It is also conceivable to manufacture a submerged box on the sea using a workboat such as a sinking barge. However, in this case, the service life of the workboat becomes extremely long, resulting in high costs. In addition, there is a problem that the work efficiency is poor because the area of the work floor is limited.

Further, when manufacturing an embedded steel box of a steel-concrete composite structure, the bottom floor slab and both side walls can be designed as a composite structure in which steel plate and concrete are combined. Because of the accumulation of breathing water, the integration of concrete and steel plate cannot be achieved, and therefore, there has been a problem that an RC structure having reinforcing bars must be designed instead of a composite structure.

[0007] The present invention has been made to solve these various problems.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the gist of the present invention is to provide a plurality of units each having a shape obtained by dividing a submerged box having a desired length to be manufactured into a plurality of sections. In the production yard on land with the opening facing up and down, placing each of the units on a workbench with a launching function and connecting them sequentially, and tightening the whole with PC steel to complete the buried box Thereafter, the present invention is directed to a method for launching a submerged box, characterized in that the vessel is floated on the surface of the water by the launching function from the workbench and launched.

[0009]

According to the method of launching a submerged box according to the present invention, since a ring-shaped unit is manufactured with its opening facing up and down, the unit between the vertically oriented steel plate and the inner mold parallel to this is formed. Concrete will be cast into the unit, and concrete latencies and breathing will accumulate at the opening end face of the unit. It is complete, and the entire circumference can be designed as a steel plate / concrete composite structure.

In addition, since small units are manufactured in the manufacturing yard, handling by a crane becomes possible, and it is not necessary to provide a large launching facility as in the case where the whole is integrally formed, and the manufacturing yard is dispersed. Even if it does, manufacturing becomes possible.

Further, since the working barge is used only for assembling and launching the buried box, the working time of the barge is significantly shorter than when the entire buried box is manufactured from the beginning.

It is to be noted that a lift barge, a sinking barge, a self-elevating type work boat (SEP), or the like can be used as the work boat.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

1 to 3 show a submerged box unit manufactured in a manufacturing yard. This unit 1 has a shape in which a submerged box to be manufactured is divided into a width of about 3 to 10 m, a steel plate 2 is integrally stretched on an outer peripheral surface, and an RC wall 3 is integrally formed inside the unit. ing. The RC wall 3 is provided with PC steel material insertion holes 4, 4,. Also, on the top and bottom slabs and the end faces of both side walls,
Shear key protrusions and depressions 5 and 6 having a shape that fits each other are provided.

As shown in FIG. 4, the unit 1 is manufactured by turning the end face opening upward, forming the steel plate 2 for the outer steel plate into a tubular shape on the bottom die plate 7 and setting it up as an outer die frame.
An inner formwork 8 is assembled on the inside thereof, and necessary reinforcing bars and a sheath for the PC steel material insertion hole 4 are inserted between them, and then concrete 9 is cast. After the predetermined strength is developed, the inner mold 8 is removed, and the inner mold 8 is lifted and moved together with the bottom mold plate 7 by the bogie 10 with a jack, as shown in FIG. Rotate it by 90 ° and move it to the temporary storage yard 12 to stock it. Note that rotation and movement after removal from the mold may be performed using a crane.

A large number of units 1 are manufactured in this way, and assembled on a workbench having a launching function, for example, a lift barge 13. At the time of this assembling, as shown in the figure, each of the units 1, 1... Is placed on a movable table 14, 14 with a sliding shoe or roller one by one, and 10 to 10 are placed between the units 1, 1,. Line up with about 30 joint intervals. Then, as shown in FIG. 8, a connecting sheath 17 for covering the outer surface except the upper surface of the joint interval with a seam steel plate 15 for the outer shell, applying the template 16 to the inner surface, and connecting the PC steel material insertion hole 4. Is installed so as to straddle the two opposing holes 4 and 4, and concrete 18 is poured into the joint space. Seam steel plate 1 on the upper surface
No. 5 is fixed after the PC steel material 19 is tensioned.

In this way, the predetermined number of units 1, 1 ...
Are connected, the PC steel 19 is inserted into each PC steel insertion hole 4, 4,. A PC steel rod or a PC stranded wire is used for the PC steel material 19. Then, the end of each PC steel material 19 is supported and tensioned by the units 1, 1,... At both ends, and a compressive stress is applied to the whole to strengthen the integration between the units.
This is made up of the individual submerged boxes A.

Next, as shown in FIG. 7, the lift barge 13
Is sunk to a desired depth, the sinking vessel A is launched and floated on the water surface, towed to a desired launching position, and sunk in the same manner as in the past to construct a sunk tunnel.

[0019]

The method for launching a submerged box according to the present invention having the above-described structure has the following various effects. (1) The required production yard can be reduced by dividing the submerged box and producing repeatedly. Further, even when a large-scale yard cannot be obtained due to the situation at the site, the unit production yard can be distributed and manufactured in several small-scale yards, so that the construction period can be shortened. (2) Since the units can be assembled on a work boat such as a lift barge on the sea, dry docks and shipbuilding docks for ships are unnecessary. In addition, these work vessels require only the period from assembling the box to launch, and the restraint period is short,
There is a cost advantage. This restraint period is about one-third of the time required to manufacture all the boxes on the work boat. (3) By manufacturing the unit in a horizontal position,
Temporary scaffolding and support work will be small. In addition, since the entire circumference of the unit and the entire circumference of the joint can be surrounded by a steel plate, it is possible to manufacture a submerged box having excellent water stopping performance. (4) Since the weight of the unit can be adjusted by appropriately setting the width of the unit, handling with a land crane is also possible with a relatively small cross section. (5) In the case of the conventional steel plate structure, concrete latencies and breathing water accumulate below the upper steel plate, and there is a problem in the quality of the concrete after completion. For this reason, only the upper floor slab is designed as an RC structure, but by cutting the box into sections and manufacturing it sideways, all such latency water can be removed and a high quality box can be manufactured In the case of a steel plate / concrete composite structure, the upper floor can be designed as a composite structure. (6) Even if there is no large-scale dry dock in the vicinity or there is no dock for shipbuilding, it is possible to manufacture buried boxes, so the range of location conditions for buried tunnels will be widened.

[Brief description of the drawings]

FIG. 1 is a plan view of an example of a submerged box unit according to the present invention.

FIG. 2 is a front view of the same.

FIG. 3 is a side view of the same.

FIG. 4 is a longitudinal sectional view showing a state of manufacturing the unit.

FIG. 5 is a side view showing a turning and moving process after the unit is manufactured.

FIG. 6 is a side view showing a state where the respective units are assembled in a buried box on a workbench.

FIG. 7 is a side view showing a launch state of the above.

FIG. 8 is an enlarged cross-sectional view showing a connection structure between units.

[Explanation of symbols]

 A submerged box 1 submerged box unit 2 steel plate 3 RC wall 4 PC steel material insertion hole 5,6 unevenness for shear key 7 bottom template 8 inner formwork 9,18 concrete 10 truck with jack 11 rotating device 12 temporary yard 13 lift barge 14 Movable stand with roller 15 Seam steel plate 16 Template 17 Connecting sheath 19 PC steel

Claims (1)

(57) [Claims] 1. A plurality of units each having a shape obtained by dividing a submerged box of a desired length to be manufactured into a plurality of slices are manufactured in a production yard on land with their opening portions turned up and down, and each unit is advanced. Placed on a workboat with water function and connected sequentially, the whole is tightened and tightened with PC steel material to complete the buried box, and then floated up on the water surface by the launching function from the workboat and launched. A method of launching a submerged box which is characterized by: