JPS61162634A - Method and device of sinking steel plate cell for installation - Google Patents

Abstract

PURPOSE:To enable a steel plate cell to be easily sunk in a sea bottom ground for installation, by a method wherein the steel plate cell is contained in a cylinder body having a top cover part being vertically slidable, and water and the air in the cylinder body and the steel plate cell are exhausted. CONSTITUTION:A steel plate cell 3 is contained in a cylinder body 2, having high rigidity, which has a top cover part 1 vertically slidable, in a manner that the upper end thereof is attached to the top cover part 1. An airtight state is held by means of a peripheral part 1a of the top cover part 1 and an internal side wall surface 2a of the cylinder body 2. Water and the air in the cylinder body 2 and the steel plate cell 3 are exhausted through a hose 5, the interior of the cylinder body 2 is brought to a negative pressure state, and when the top cover 1 slides downward, the steel plate cell 3, simultaneously, is pressed in a sea bottom ground 21. After the steel plate cell 3 is sunk by press-in into the ground 21 for installation, movement of the cylinder body 2 causes completion of a sinking work of the steel plate cell 3. This enables the steel plate cell 3 to be easily sunk in the sea bottom ground 21 for installation through the utilization of the force of the top cover part 1 produced during downward movement.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method and apparatus for depositing steel plate cells in seabed soil as the main structure in the construction of bridge foundations and the like.

[Prior art and its problems]

Conventionally, this type of steel plate cell was laid using a method of transmitting vibration energy to the steel plate cell and driving it into the ground, and the equipment used for this purpose was one that synchronized multiple vibratory pile drivers. generally known.

However, when it is necessary to drive a steel plate cell into the seabed with the driving equipment such as a vibrating pile driver completely submerged in water, for example, it is necessary to drive the steel plate cell to the extent that the top end of the steel plate cell is close to the seabed surface. In this case, there are many difficulties such as the need to make the vibratory pile driver watertight, the added weight of the driving device is large, and the efficiency is significantly reduced.

In addition, in order to achieve the condition described above by pouring steel plate cells without submerging the pouring equipment in water, it is necessary to ensure that the upper end remains above the water surface even after pouring to the required depth in the ground. Another possible method would be to cast a steel plate cell with a very large height, and then cut the steel plate cell underwater near the seabed.

However, this method is not practical because it requires a large amount of work cost for transporting large steel plate cells and for rocks that are difficult to cut underwater.

In addition, by reducing the internal pressure of a highly rigid cylindrical body made of thick-walled reinforced concrete with a lid on the top and applying external pressure and external water pressure to the cylindrical body,
It is also possible to apply the vacuum submersion method, which involves press-fitting directly into the seabed soil, to steel plate cells.

However, if a lid is installed at the top of the steel plate cell to lower the internal pressure, the wall thickness is very thin, so the steel plate cell itself will buckle due to the external pressure, making it difficult to press-fit the steel plate cell into the seabed ground. It becomes impossible.

[Purpose of the invention]

This invention was devised in view of the above-mentioned circumstances, and its purpose is to provide a simple structure that does not require any special equipment.
It is an object of the present invention to provide a method for sinking a steel plate cell and an apparatus therefor, which can easily and reliably perform press-fitting work into seabed ground even underwater.

[Means for solving problems]

This invention creates a negative pressure inside the cylinder when the lower end of the cylinder, which has a canopy that can slide vertically, is brought into contact with the seabed ground surface and water and air inside the cylinder are discharged. The problems of the prior art can be solved by utilizing the phenomenon that the canopy tends to slide downward due to the external pressure of water and air.

Then, the upper end is connected to the canopy part, the steel plate cell is housed in the cylindrical body, and the steel plate cell is sunk by being press-fitted into the seabed ground by the force of the canopy part sliding downward as described above. It is something.

〔Example〕

The method of this invention will be explained below with reference to an embodiment shown in FIGS. 1 to 3.

First, the upper end is attached to the canopy part 1 in a highly rigid cylindrical body 2 having a canopy part 1 that can be slid in the vertical direction, and the steel plate cell 3 is
to store. Here, the peripheral edge 1a of the canopy 1 is the cylindrical body 2.
Airtightness is always maintained between the inner wall surface 2a and the inner wall surface 2a.

Then, the cylindrical body 2 in which the steel plate cell 3 is already housed is inserted into the steel plate cell 3.
The cylindrical body 2 and the lower ends of the steel plate cells 3 are brought into contact with the seabed ground surface 4.

(See Figure 1) After that, use the hose 5 etc. to remove the cylindrical body 2 and the steel plate cell 3.
Drain the water and air inside. In this way, the inside of the cylindrical body 2 becomes negative pressure, and external pressure of water pressure and atmospheric pressure is applied to the entire cylindrical body 2. At this time, since the canopy part 1 is slidable, it is pushed downward by an external force (air pressure in this embodiment), and at the same time, the steel plate cell 3 is press-fitted into the seabed ground 21. (See FIG. 2) At this time, the cylindrical body 2 has a thick wall and high rigidity, so it is not affected by external forces.

Further, since the wall thickness of the steel plate cell 3 is very thin, it can be easily press-fitted into the ground 21. For these reasons, the steel plate cell 3 can be reliably press-fitted into the ground 21 using the force that causes the canopy part 1 to slide downward.

After the steel plate cells 3 are press-fitted into the ground 21, the cylindrical body 2 is moved, and the work of sinking the steel plate cells 3 is completed. (
(See FIG. 3) Next, the sinking device 6 for sinking the steel plate cells 3 using the sinking method described above will be described in detail.

The sinking device 6 includes a cylindrical body 9 into which the steel plate cell 3 can be stored, an injection/discharge part 10 for injecting and discharging water and air into or from the steel plate cell 3 and the cylindrical body 9, and a canopy part. 8
and is attached to the cylindrical body 9, and water and air are injected from the injection/exhaust part 10.

It consists of a buoyancy adjustment section 12 where discharge is performed.

(See Fig. 4) A steel plate 1 is attached to the cylindrical body 9 along the circumferential direction toward the lower end thereof.
1 is installed. In addition, the buoyancy adjustment part 1 of the cylindrical body 9
2 is attached to the upper outer wall surface of the cylindrical body 9 along the circumferential direction.

Moreover, the canopy part 8 has an airtight part 13 on its periphery that can maintain airtightness with the cylindrical inner wall 9a, and can reliably discharge water and air inside the cylindrical body 9. A buoyancy adjusting section 12 is provided which is shaped like a circle with air discharged therein, and a pouring and discharging section 10 is provided on the outer upper surface.

This inlet/exhaust section 10 includes a pump 14 for injecting and discharging water, a pump 15 for injecting and discharging air, a switching valve 16 and a valve 17 provided in each pump 14 and 15, and an air vent valve 18. It has become.

Here, the pump 14 injects and discharges water into both the buoyancy adjustment parts 12.12 of the cylinder body 9 and the canopy part 8, and into the cylinder body 9 and the steel plate cell 3. Further, the pump 15 has a cylindrical body 9
and canopy part 80, buoyancy adjustment part 12.12, and cylindrical body 9
Air is injected and discharged into and out of the steel plate cell 3i.

The holding part 7 is composed of a hydraulic chuck operated by hydraulic pressure, and 19 is a pipe for supplying oil.

In order to perform the work of sinking the steel plate cell 3 using the sinking device 6 having such a configuration, first the steel plate cell 3 is manufactured on land in a yard or the like, and at the same time, a sinking device 6 that matches the dimensions of the steel plate cell 3 is installed on land. Assemble.

Then, the steel plate cell 3 is covered with the submersion device 6, and the steel plate cell 3 is held by the holding part 7 (hydraulic chuck) attached to the canopy part 8.
, and connect the sinking device 6 and the steel plate cell 3. At this time, the canopy part 8 is fixed to the upper part of the cylindrical body 9 by appropriate means.

After storing the steel plate cell 3 in the submersion device 6 in this manner, the submergence device 6 is transported to the position where the steel plate cell 3 is placed. (See Figure 5) This transportation can be carried out by transporting the entire connected submersion device 6 and steel plate cell 3 to the submerging position by suspending it by a hoist (not shown), or by transporting the entire connected submersion device 6 and steel plate cell 6 to the submersion position If the buoyancy adjustment unit 12 can provide the submersion device with a buoyancy force that exceeds its weight in water, this is done by floating the entire device to the surface of the water and towing it to the submersion position.

Next, water is injected from the pump 14 into the buoyancy adjustment section 12 attached to the cylindrical body 9 of the submersion device 60 (and into the buoyancy adjustment section 12 attached to the canopy section 8 if necessary) to make the device heavier. Then, the submersion device 6 and the steel plate cell 3 are grounded on the seabed ground surface 4 at the submerged position, and the steel plate 11 at the lower end of the cylindrical body 9 is sufficiently thickened into the ground 21. At this time, air vent valve 1
8 is left open. If the sinking device 6 is heavy enough without injecting water, the steel plate 1 should be grounded without injecting water.
1 into the ground 21. This steel plate 11 prevents water from entering the cylindrical body 9 from the periphery through the ground, and prevents the sinking device 60 from becoming insufficiently functional. (See Figure 6) Next, the fixation between the canopy part 8 and the cylindrical body 9 is released, the air vent valve 18 is closed, and the water inside the cylindrical body 9 and the steel plate cell 3 is discharged from the hose 20 by the pump 14. . At this time, the inside of the cylindrical body 9 becomes negative pressure, and the external pressure (water pressure in this embodiment) applied to the cylindrical body 9 and the canopy part 8 increases. This external pressure causes the canopy part 8 to maintain airtightness and watertightness with the cylindrical inner wall 9a by the airtight part 13, while the steel plate cell 3
At the same time, the steel plate cell 3 starts to move downward, and the steel plate cell 3 is press-fitted into the ground 21. (See FIGS. 7 and 8) Next, when the steel plate cell i is press-fitted to a predetermined depth, the connection by the holding portion 7 is released. Then, water is discharged from the buoyancy adjustment part 12 of the canopy part 8, and air or water is pumped into the cylindrical body 9.
In step 4.15, while injecting from the hose 20 and the inlet/outlet 22, the canopy is lifted up by a hoist, the canopy 8 is returned to its original position, and the canopy 8 and the cylindrical body 9 are fixed again. In addition, if sufficient buoyancy can be obtained by draining the water in the buoyancy adjustment part 12 of the canopy part 8, the canopy part 8 may be floated by buoyancy and returned to its original position without using a hoist. . (See Figure 9) Next, the water in the tank, which is the buoyancy adjustment part 12 of the cylindrical body 9 of the sinking device 6, is discharged by the pump 14 to make the device lighter, and then the sinking device is hoisted by a hoist and placed on the ground. While pulling out the lower end steel plate 11 that is joisted inside 21,
is removed, and the work of laying the steel plate cell 3 is completed. (10th
(See Figure 11) At this time, by discharging the water in the buoyancy adjustment section 12,
When sufficient buoyancy is given to the submersion device 6 and it floats above the water surface, it can be towed away while floating, as in the case where it is transported to the submergence position.

Note that when sending water from the pump 14 to each buoyancy adjustment section 12, the valve 17 is opened to exhaust air, and the pump 1
4, each buoyancy adjustment section 12 also operates valve 1 when discharging water.
7 is opened to send air.

Further, the buoyancy adjustment section 12 of the cylindrical body 9 is not limited to being attached to the outer wall surface as in this embodiment, but may be installed inside the cylindrical body 9.

FIG. 12 to FIG. 15 show the submerged state of a steel plate cell whose height is larger than the water depth.

In FIG. 12, the submersion device 6 is conveyed to the submersion position in the same manner as in the embodiment described above, and the submergence device 6 is grounded on the seabed ground surface 4.

Then, as shown in FIG. 13, the cylindrical body 9 and the steel plate cell 3
The water and air inside are discharged, and the canopy part 8 is slid downward. The external pressure at this time is atmospheric pressure.

After that, as shown in FIG. 14, when all the water is discharged, only the air is discharged, and the canopy part 8 is further slid downward, and the steel plate cell 3 is press-fitted to a predetermined depth. In this case, the water inlet of the hose 20 must always be located underwater, and it is desirable to use a sufficiently long hose as shown in Figure 12. It is preferable to use a hose that is sufficiently flexible so that it will not be damaged when the canopy part 8 slides and descends as shown in Figures 14 and 14.

Then, as shown in FIG. 15, the sinking device 6 is removed in the same manner as in the embodiment described above.

The cylindrical body 9 of the sinking device 60 and the canopy part 8 may have an integral structure as shown in FIG. 16, instead of being integrally constructed as in this embodiment. In this way, although it is necessary to maintain airtightness between the small blocks, the size of the sinking device 6 can be adjusted to the dimensions of the steel plate cell 30, and it is also easy to dismantle and store it. becomes.

Further, the pouring/discharging section 10 does not necessarily need to be attached to the canopy section 8, but may be installed on a barge or a work boat and connected to the canopy section 8 with a hose or the like.

Furthermore, although the method and apparatus for sinking of the present invention have been described in the case of sinking steel plate cells, it goes without saying that the present invention can also be applied to the sinking of similar thin-walled cylindrical steel structures, such as steel sheet pile cells. do not have.

〔Effect of the invention〕

The present invention has the above configuration and has the following effects.

A steel plate cell is housed in a cylindrical body with a canopy, and the water and air inside the cylinder are discharged to create a negative pressure.The steel plate cell is then moved using the force of the canopy to move downward due to external pressure. By press-fitting the cell into the seabed, there is no need for a driving device such as a vibrating pile driver, and the structure and operation are simple, making it possible to easily sink the steel plate cell.

Therefore, even when submerging steel plate cells in water, it is not necessary to maintain watertightness of the above-mentioned pouring device, and the work in water becomes easy.

This is particularly effective in cases where the upper end of the steel plate cell needs to be below the water surface, such as when steel plate cells are applied to bridge foundations.

Moreover, since the steel plate cell is housed in a cylindrical body with high rigidity and is submerged, it can be reliably press-fitted into the ground without being affected by external forces such as water pressure.

[Brief explanation of drawings]

Figures 1 to 3 are the root causes of the construction that show the sinking method of this invention, Figure 4 is a sectional view showing the sinking device of this invention, and Figures 5 to 1.
Fig. 1 is a process diagram showing the state of submerging steel plate cells by the submerging device of the present invention, Figs. 12 to 15 are process charts showing the submerging state of steel plate cells of different dimensions, and Fig. 16 is a cylindrical body that is the submerging device. It is a perspective view showing another aspect of. 1... Canopy part, 1a... Peripheral part, 2... Cylindrical body, 2a
...Inner wall surface, 2b...Outer wall surface, 3...Steel plate cell, 4
...Ground surface, 5..Hose, 6..Sinking device, 7..
Holding part, 8...Canopy part, 9...Cylindrical body, 9a...Inner wall,
10... Pour/exhaust part, 11... Steel plate, 12... Buoyancy adjustment part, 13... Airtight part, 14... Pump, 15... Pump, 16... Switching valve, 17... Valve, 18...
・Air vent valve, 19...Piping, 20...Hose, 21...Inside the ground, 22...Inlet/outlet. Figure 1 Figure 2 Figure 3 Figure 84 Figure 5 Figure 6 Figure 711 Figure 8 Ugly Figure 9 Figure 10 Figure 11 →------ Figure 12 Figure 13 Figure 14J Figure 15 No.

Claims (2)

[Claims] (1) After storing the steel plate cell inside a cylindrical body having a vertically slidable canopy and connecting its upper end to the canopy, the lower ends of the cylindrical body and the steel plate cell are brought into contact with the seabed ground. Then, by discharging the water and air inside the cylindrical body and the steel plate cell to create a negative pressure, the canopy part utilizes the force of sliding downward inside the cylindrical body due to the pressure of outside air and outside water. 1. A method for depositing steel plate cells, which comprises press-fitting the steel plate cells into seabed ground. (2) It is formed so that steel plate cells can be stored inside,
a highly rigid cylindrical body having a canopy part that can hold the upper end of the steel plate cell by a holding part; an inlet/exhaust part for injecting and discharging water and air into or from the steel plate cell and the cylindrical body; It consists of a canopy part and a buoyancy adjustment part attached to the cylindrical body and in which water and air are injected and discharged from the injection/drainage part, and the canopy part has an airtight part between it and the wall of the cylindrical body. The water and air inside the cylinder can be reliably discharged, and
A steel plate cell sinking device characterized in that it is configured to be able to move up and down inside a cylindrical body with water and air discharged.