JPH073738A - Moving mound - Google Patents

Abstract

PURPOSE:To enable a moving mound to be easily set on and put away from the bottom of water, to allow easy removal of the mound during the manufacturing process of a caisson, and to enable the site of manufacture to be used as a proper harbor facility. CONSTITUTION:The inside of a cylindrical body open on its upper side is partitioned into a lower 9 and upper 9a chamber and a buoyant body 8 is provided in the lower chamber 9 and a mound material 10 on the upper portion of which a freely-floating working pontoon 2 can be installed is provided in the upper chamber 9a. The amount of the buoyant body 8 and/or that of the mound material 10 are adjusted so that the overall specific gravity is slightly greater than water or sea water, and that the mound can be set on and put away from the bottom B of the sea.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a movable mound for a work pontoon for constructing a concrete structure such as a caisson, and more particularly to a movable mound that can easily set on and off the water bottom.

[0002]

2. Description of the Related Art When constructing a concrete structure or the like using a work pontoon near a quay, generally, for example, as shown in FIG. 12, sand, gravel, rubble stones, concrete lumps, etc. are dropped on the seabed. Or, it will be sunk, and a mound 1'of a predetermined height will be built according to the depth of water, etc., and the work platform 2 will be bottomed on this mound 1'for safe and efficient construction work.
I made a good quality caisson 3 and removed the mound 1'after the completion.

[0003]

Therefore, it takes a long time to build the mound 1 ', and the function of the port facility is lost due to the built mound 1'. For example, a tsunami or a low pressure is generated. In an emergency such as when an emergency situation such as an approach occurs, even if a ship near the harbor tries to enter the harbor to evacuate, there is a mound 1 ', which reduces the number of ships that can be accommodated. There is a problem in that even if an attempt is made to remove ′, it will be time-consuming and costly, and that the removal will not be in time for the anchorage of the ship in an emergency.

The present invention has been proposed in view of the above points, and its object is to make it possible to easily remove the mound and restore the port facility to its original form in the event of an emergency. To provide an affordable, mobile mound.

[0005]

According to the present invention, the inside of a cylinder whose upper part is opened is divided into a lower chamber 9 and an upper chamber 9a, and a buoyant body 8 is provided in the lower chamber 9 and Room 9a
Is provided with a mound material 10 on which a work platform 2 that can float and sink is installed, and the buoyant body 8 and / or the mound material 10 are provided.
The total specific gravity is adjusted to be slightly larger than that of water or seawater by adjusting the amount of water, so that it can land on and off the seabed B to achieve the above object.

[0006]

According to the present invention, by adjusting the amounts of the mound material 10 and the buoyant body 8 provided above, the movable mound 1 is moved to the seabed B.
It is configured so that it can be landed on or off. Also,
Upon leaving the bottom, the mound material 10 in the upper chamber 9a is discharged,
The buoyancy of the buoyant body 8 is used to easily remove the mobile mound 1 from the seabed B. Therefore, when the necessity arises for some reason, the work site for caisson production can be easily and quickly returned to the original port facility.

[0007]

1 to 4 show one embodiment of the mobile mound of the present invention, in which FIG. 1 shows the completed mobile mound 1 of the present invention installed on a seabed B near a quay G. A work platform 2 that can float up and down is installed on the work platform 2, and a concrete structure such as a caisson 3 is manufactured on the work platform 2.

FIG. 2 is a sectional view taken along the line AA in FIG. Reference numeral 4 in these drawings denotes a rope whose one end is connected to an appropriate position on the outer wall 5 side of the movable mound 1, and an anchor 6 which is locked to the seabed B is provided at the other end of the rope 4 and thereby a wave is formed. The mobile mound 1 is fixed on the seabed B so as not to move. Further, 7 is a reinforcing material provided as needed on the outer periphery of the outer wall 5, 8 is a buoyant body provided in the lower chamber 9 inside the movable mound 1, and 10 is an upper portion on the floor slab 11 above it. Details of the movable mound 1 including the mound material provided in the chamber 9a will be described later with reference to FIG.

Further, 12 is a winch installed on the upper part of the work table 2, 13 is a pulley for guide, and 14 is a winch 1.
With a wire rope that can be wound up and down by 2,
This wire rope 14 is hung downward via a pulley 13 and its lower end is connected to the movable mound 1 side via a connecting means 18, and the work platform 2 and the movable mound 1 are shown in detail in FIG. It is connectable / separable via a connecting means 18 comprising a tool 15 and a joint tool 16 on the side of the float 17 having a detachable structure. The float 17 is slidable with respect to the wire rope 14a.

3 and 4 show an example of a method of manufacturing the movable mound 1 described above. That is, FIG. 3 is a perspective view of one mound unit 1A which is a constituent member of the movable mound 1, and the mound unit 1A has an outer wall 5 made of, for example, an iron plate or steel framed in a substantially rectangular shape when seen from a plane.
And the inner wall 5a, and the upper and lower openings are provided with a cylindrical body, and the floor slab 11 is provided at a substantially central position of each inner wall surface inside the outer wall 5 and the inner wall 5a. The interior of the cylinder is divided into a lower chamber 9 and an upper chamber 9a by. The position at which the floor slab 11 is provided varies depending on the scale. Further, the pair of outer side walls 5 that are adjacent to each other at a right angle are higher than the pair of inner side walls 5 a that are arranged to face the outer side walls 5 respectively.

Thus, the mound unit 1A manufactured in this manner is combined and integrated on the land as shown in FIG. 4 to form the movable mound 1.

That is, in the illustrated example, four mound units 1A are used, the short inner side walls 5a are joined to face each other, and the cross-section is substantially U-shaped and the overall shape is substantially cross-shaped. Each of the inner side walls 5 joined to each other in the U-shaped groove of the cover 19 made of, for example, a steel material.
The mound units 1A are integrated by inserting the upper part of a and using bolts, nuts, etc. (not shown).

Further, strip-shaped reinforcing members 7 are provided on the outer periphery of each outer wall 5, for example, in the upper and lower portions, so that the respective mound units 1A are reliably integrated. It should be noted that, as shown in FIG. 4, a plate-shaped reinforcing member 19a may be provided on the abutting surface of the outer wall 5 of each mound unit 1A, for example, as shown in FIG.
And the like, the strength is improved and the mound material 10 is provided.
It is preferable because it can prevent the leakage of

As shown in FIGS. 1 to 3, the floor slab 11
A buoyant body 8 is provided in the lower chamber 9 below. Styrofoam, for example, is used as the buoyant body 8.
As the Styrofoam, for example, a Styrofoam block of a factory standard product (2m × 1 as a commercial product at the present time)
m × is present ones 0.5 m) is used, the specific gravity of 30Kg / m ³ ~16Kg / m ³ approximately in the specific gravity of the apparent, and compressive strength 2.2~0.9Kgf / cm ²
The buoyancy body 8 is formed by stacking a predetermined number of these. Therefore, since the movable mound 1 has a suitable buoyancy, it can be easily moved, and can have sufficient durability even on a heavy object (such as a work pontoon) placed on it.

The material of the buoyant body 8 is not limited to polystyrene foam, and other substitutes may be used as long as they have the same effect. Further, the movable mound 1 has shown an example in which four mound units 1A are combined, but the mound unit 1A can be increased or decreased in advance according to the size of a large integrated mound unit or the scale. The height is selected according to the scale. The plane shape of the movable mound 1 may be circular or the like.

Next, a procedure for installing the movable mound 1 thus manufactured on the seabed B will be described. First, the completed mobile mound 1 is suspended by a crane (not shown) or the like and floated on the water. Then, the mound material 10 such as earth and sand is put into the upper chamber 9a by a crane or the like. In this case, the mound material 10 is charged and compacted on average so that the movable mound 1 does not tilt, but this work is easy because the height of the inner wall 5a is low. As the mound material 10, any one of a lightweight concrete block, a steel material such as H steel, a steel lining plate, a concrete block, or the like or a combination thereof other than earth and sand may be used. For example, sand or gravel and concrete may be used. It may be one in which plates are alternately laid in a sandwich. Then, the apparent specific gravity of the mobile mound 1 is adjusted to be slightly larger than the specific gravity of seawater or water. This can be easily adjusted by the size and number of the buoyant bodies 8, the amount of the mound material 10 charged, and the like. In addition, on land, a part of the mound material 10 such as earth and sand or sand is previously loaded in the upper chamber 9a,
Of course, it is possible to make the work on the water as easy as possible.

Next, a method for manufacturing a caisson will be described. When manufacturing a caisson, as shown in FIG. 5, a movable pontoon 2 of a general structure capable of pouring and draining water is placed on a movable mound 1, and the movable mound is used for diving work. 1. A sheet 20 is laid on the mound material 10 of 1 (see FIGS. 1 and 2), and one end of the wire rope 14 can be hoisted and unwound on a winch 12 installed on the work table ship 2. Connect the fitting 15 at the other end of the wire rope 14a to at least four sides of the movable mound 1.
The floating mound 1 is locked and fixed to a connecting means 18 composed of a fitting 16 (see FIG. 11) provided above the float 17 attached thereto, and the two are connected to each other, and the movable mound 1 is suspended on the work platform 2. Then, the vessel is towed by a towing boat such as a tugboat (not shown), and is brought to a predetermined location near the pier G of the harbor, as shown in FIGS.

Then, the winch 12 is driven, the wire rope 14 is loosened, and as shown in FIG. 6, the movable mound 1 is settled and settled on the seabed B. In this case, since the lower chamber 9 of the movable mound 1 is filled with the buoyancy body 8 and the lower part is opened and the buoyancy body 8 is in direct contact with the seabed ground, concentration force is not generated in the mound unit 1A. Its rigidity is small. Further, seawater is injected into the float 2a of the work pontoon 2 and / or the inside of the hull by a pump or the like (not shown) to increase the weight of the work pontoon 2 and land the work pontoon 2 on the movable mound 1. Fixed at the bottom.

Next, the fitting 15 provided at the tip of the wire rope 14 and the wire rope 1 on the movable mound 1 side.
The joint 16 above the float 17 of 4a is separated at sea, and the winch 12 provided on the work pontoon 2 is driven to loosen the wire rope 14. In this case, the float 17 floats on the water surface, and its location is clear. Then, the desired caisson 3 is manufactured on the work table boat 2.

Next, a launching method when the caisson 3 is completed will be described. That is, as shown in FIG. 8, the weight of the work pontoon 2 is reduced by draining the seawater inside the work pontoon 2 with a pump or the like, so that the caisson 3 is lifted above the sea.

Then, as shown in FIG. 9, the work platform 2 is towed offshore by a tug boat or the like. When it reaches a predetermined place, as shown in FIG. 10, seawater is poured into the work pontoons 2 again to allow the work pontoons 2 to sink. In this process, the sea level rises, and the caisson 3 receives a predetermined buoyancy and floats.
The caisson 3 is pulled out by a tugboat or the like and towed and installed at an installation position such as a breakwater.

Next, the seawater inside the work table 2 is drained,
After reducing the amount of water used for stiffening, the work table boat 2 is moved to the movable mound 1 again, seawater is poured into the inside, and the caisson 3 is manufactured again by installing it on the movable mound 1 as shown in FIG. , You can repeat the above work as many times as necessary.

After the work is completed and the caisson 3 is manufactured, the wire rope 1 having one end provided on the movable mound 1
When the anchor 6 at the other end of 4 is separated from the seabed B by diving and the mound material 10 is discharged by a clam shell (not shown) to reduce the weight, it floats due to the action of the buoyant body 8. Should be towed to a predetermined location and housed. Therefore, the mobile mound 1 can be reused for manufacturing other caisson, and is economical.

However, in the caisson manufacturing process, when the ship wants to enter the harbor for some reason in the state of FIGS. 6 to 8, the winch 12 of the work pontoon 2 is extended and the fitting 15 is moved to the sea surface. When the winch 12 is wound up, the movable mound 1 has an apparent specific gravity slightly larger than that of seawater, so that it can be easily detached from the seabed. it can. If the mobile mound 1 and the work pontoon 2 are moved by a tugboat or the like, the mobile mound 1 can be quickly removed from the seabed B, so that the ship can enter the port and function as a port facility. It can be demonstrated quickly.

When the work pontoon 2 is already separated, depending on the situation, the work pontoon 2 is again installed on the movable mound 1 and connected to each other, and both are simultaneously removed as described above. It is good, or only the movable mound 1 is appropriately discharged from the mound material 10 (if the movable mound 1 has sufficient buoyancy, this is not necessary), the anchor 6 is removed from the seabed, and the crane or towed. It may be removed and left floating in another place or settled on the bottom. In these cases, the movable mound 1 is normally adjusted to have a specific gravity larger than that of seawater, so that the bottom and bottom of the movable mound 1 can be easily moved with a small capacity crane or winch.

[0026]

INDUSTRIAL APPLICABILITY As described above, the movable mound according to the present invention is moved and removed from the seabed together with the work pontoon 2,
Alternatively, since the mound material 10 is discharged and can be moved / removed by a crane or the like, the function as a port facility can be easily provided and the workability of the removal is good,
It is economical. Also, in this case, the specific gravity of the whole is the buoyancy body 8
It can be adjusted by the amount of mound material 10 and is slightly heavier than water or seawater, so it can be easily landed on or off with a small capacity crane, winch, etc., good workability, and equipment cost Has the advantage of being cheaper.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing the basic configuration of an embodiment of a movable mound of the present invention.

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is a partially cutaway perspective view of a mound unit that constitutes the movable mound of the present invention.

FIG. 4 is a perspective view showing a manufacturing process of an example of the movable mound of the present invention.

FIG. 5 shows a state in which the mobile mound of the present invention is set on the bottom.

FIG. 6 shows an explanatory view in which the mobile mound of the present invention is attached to the seabed.

FIG. 7 shows a plan view of FIG.

FIG. 8 is an explanatory view showing a state in which the work pontoon is separated from the movable mound of the present invention.

FIG. 9 shows a state of towing a work pontoon.

FIG. 10 shows a state in which a work pontoon and a caisson manufactured above the work table are separated to launch the caisson.

FIG. 11 shows a structural example of a fitting and a float used in the present invention.

FIG. 12 shows a conventional example.

[Explanation of symbols]

 1 Movable Mound 1A Mound Unit 2 Work Table 2a Float 3 Caisson 4 Rope 5 Outer Sidewall 5a Inner Sidewall 6 Anchor 7 Reinforcing Material 8 Buoyant Body 9 Lower Room 9a Upper Room 10 Mound Material 11 Floor Slab 12 Winch 13 Pulley 14 Wire Rope 14a Wire rope 15 Coupling tool 16 Coupling tool 17 Float 18 Connecting means 19 Cover 20 Seat B Seabed G Quay

Claims (1)

[Claims] 1. The inside of a cylinder whose upper part is opened is divided into a lower chamber (9) and an upper chamber (9a), and a buoyant body (8) is provided in the lower chamber (9). And upper chamber (9a)
In the upper part, a mound material (10) on which a floating workbench (2) can be installed is provided, and the total specific gravity is water or seawater by adjusting the amount of the buoyant body (8) and / or the mound material (10). A mobile mound that is configured to be slightly larger and can land on and off the seabed (B).