JPH0694669B2 - Method of constructing foundation for underwater structure and foundation unit used for this construction - 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 for constructing a foundation for an underwater structure and a foundation unit used for this construction, and more particularly to an underwater ground (seabed ground).
For example, a method of constructing a foundation to be used for structures such as artificial reefs, submerged dikes, breakwaters, beach nourishment, gentle slope revetments, breakwaters, breakwaters, foundation rubble mounds, and even quays. And the basic units used for this construction.

[0002]

2. Description of the Related Art Generally, artificial reefs, submerged levees, breakwaters, beach nourishments, gently sloping revetments, breakwaters, breakwaters, foundation rubble mounds, and even underwater structures such as quays. When constructing on the underwater ground, it is necessary to form a foundation for this structure on the constructed ground (underwater ground) for stabilization and reinforcement.

As a method for stabilizing or strengthening the underwater ground, a simple method such as directly discarding rubble stones on the underwater ground is widely adopted.
Subsidence and runoff often occur due to scouring with wave water.

In order to solve this problem, some measures have been taken, such as excavating the underwater ground and then throwing away rubble stones. However, not only is there a great deal of rework and lack of certainty, but diving workers and other workers also use manual methods. Since it was necessary to finish and level the top surface of the rubble, it was pointed out that there were various problems to be solved, such as low work efficiency, prolonged construction, and huge costs.

[0005]

In view of the above, according to the present invention, a large number of base units each of which is composed of a box-shaped frame whose inside is filled with a filling material and whose top is closed by a lid, are then suspended and held. It is placed on the underwater ground for constructing the structure in the state, and the floor material corresponding to the bottom of the base unit is removed by injecting high-pressure fluid from the corner bottom of the box-shaped frame or sucking the underwater ground. By substituting the foundation unit to a predetermined depth to construct a foundation for underwater structures, it is intended to eliminate the floor excavation of the underwater ground and the leveling work of rubble.

When the high-pressure fluid is jetted from the corner bottom of the box-shaped frame or when the underwater ground is sucked, if the floor material is removed by adjusting the jetting direction of the high-pressure fluid or the suction direction of the underwater ground, The unit can be securely and easily sunk.

Further, as a base unit used for constructing the foundation for the underwater structure, it is arranged at a corner portion of a box-shaped frame body in which a filling material is filled inside and a top is closed by a lid. It is preferable that the column member is provided with a fluid passage, the upper end of the fluid passage is provided with a connection portion with a high-pressure fluid supply device or a fluid suction device, and the lower end is provided with a fluid injection port or a fluid suction port. , Again,
It is preferable that the ejection direction of the fluid ejection port or the suction direction of the fluid suction port disposed at the lower end of the fluid passage be adjustable.

Further, as an alternative to the basic unit, a column member disposed at the corner of a box-shaped frame body which is filled with a filling material and whose top is closed by a lid is provided. It is also possible to adopt a configuration in which a through hole is provided in the through hole, and the fluid injection pipe of the high-pressure fluid supply device or the fluid suction pipe of the fluid suction device is detachably inserted into the through hole.

[0009]

According to the present invention, the base unit corresponding to the bottom of the base unit is removed by jetting a high-pressure fluid from the corner bottom of the base unit consisting of a box-shaped frame or by sucking the underwater ground. Since it is submerged at a predetermined depth, it not only can prevent inconvenience due to scouring etc.
It is possible to efficiently construct a flat foundation for underwater structures, and thus it is possible to omit the work of excavating the floor of the underwater and leveling the rubble.

[0010]

EXAMPLES Next, with reference to the attached drawings, a preferred example of a method for constructing a foundation for an underwater structure according to the present invention will be described.
The details will be described below.

That is, in the method of constructing a foundation for an underwater structure according to the present invention, a foundation unit 10 as shown in FIGS. 1 and 2, for example, is used.

The basic unit 10 connects an upper beam member 12 and a lower beam member 14 made of, for example, a steel material via four pillar members 16 and between the upper and lower beam members 12, 14 and the bottom portion. The screen material 18 at predetermined intervals
Is stretched to form a rectangular parallelepiped box-shaped frame body 20.

In this case, it is preferable to connect the lower beam member 14 to a position slightly above the lower end of each column member 16 so that a space is formed at the bottom of the box-shaped frame 20.

The box-shaped frame body 20 is filled with an appropriate filling material 22 such as rubble stones, concrete blocks and waste materials, and the top of the frame body 20 is used as a cover material for the screen material 1.
8 to form a flat surface (see FIG. 2).

Each column member 16 of the box-shaped frame 20 has a fluid passage 24 extending therethrough along its longitudinal direction. A connecting coupler 26 for connection with a fluid actuating mechanism such as a high-pressure fluid generating device or a fluid suction device, which will be described later, is provided at the upper end of each fluid passage 24, and the lower end thereof is obliquely below the inner center of the box-shaped frame 20. The pointing opening 28 is opened.

In the present embodiment, the lower end of the fluid passage 24 is formed as an opening 28 which is directed obliquely downward. However, a nozzle equipped with, for example, a universal joint is attached to the opening 28. It is preferable that the injection direction of the fluid ejected from the opening or the suction direction of the fluid sucked is adjusted.

When constructing a foundation for an underwater structure using the foundation unit 10 thus constructed, as is apparent from FIG. 3, first, a box-shaped frame filled with the filling material 22. A large number of base units 10 formed by closing the top of the body 20 with the screen material 18 are appropriately accumulated on the land near the construction site of the underwater structure.

Next, the suspending means of the crane 30 is attached to the top of the box-shaped frame 20 at a proper position to lift the base unit 10, and the fluid supply pipe 34 of the high-pressure fluid generating / supplying device 32 is connected to the connecting coupler 26 of each pillar member 16. Connect. Next, the crane 30 is operated to move and mount the base unit 10 on the underwater ground G for constructing an underwater structure,
High-pressure fluid generation and supply device 3 while being held by the crane 30
Activate 2. In this case, the holding state of the crane 30 is appropriately adjusted so that the base unit 10 stands upright on the underwater ground G.

The high pressure fluid generated by the operation of the high pressure fluid generator 32 is supplied to the fluid supply pipe 34 and the base unit 1.
Although it is injected from the openings 28 through the fluid passages 24 provided in each column member 16 of 0, since each opening 28 is directed obliquely downward from the inner center of the box-shaped frame 20, the underwater ground G Is blown upward, and the bottom side of the box-shaped frame 20 is removed as if the bottom was dug.

At this time, it is preferable that the injection direction of the high-pressure fluid injected from the opening 28 is appropriately adjusted according to the bottom quality and topography of the underwater ground G. In this case, the opening 28 is For example, a nozzle provided with a universal joint or the like may be mounted and the pointing direction of the nozzle may be adjusted by remote control or manual control. Needless to say, the injection pressure and injection amount of the high-pressure fluid are appropriately adjusted depending on the depth of the underwater ground G and the condition of the bottom sediment.

In this way, while removing the bottom sediment of the underwater ground G, the crane 30 is operated to sink the base unit 10 as it is and set it at a predetermined position, and then the fluid of the high-pressure fluid generator 32 is fed from the connection coupler 26. The supply pipe 34 is removed. Then, another foundation unit 10 is successively deposited at a position adjacent to the deposited foundation unit 10 in the same procedure as described above to construct the underwater structure foundation 36.

Since the underwater structure foundation 36 constructed in this manner is submerged in the underwater ground G and is stable, inconvenience such as scouring due to waves or the like can be prevented as much as possible. become.

In the present embodiment, the injection of high-pressure fluid was used as a means for removing the bottom sediment of the underwater ground G. However, the fluid intake pipe of the fluid suction device is connected to the connection cover 26 of the pillar member 16 in the basic unit 10. Then, the bottom material of the underwater ground G may be removed by suction, and in this case also, it is preferable that the suction direction of the bottom material can be adjusted.

The foundation 36 for the underwater structure constructed
Since the top end is formed as a flat surface, it is possible to build an underwater structure on the foundation 36 without the need for leveling work by a diver. Specifically, when the underwater structure is an artificial leaf 38 as shown in FIG. 4, a base unit 40 having the same taper as the base unit 10 is laid at the front and rear ends of the underwater structure base 36, The wave-dissipating block 42 and the covering block 44 may be appropriately arranged on these upper surfaces.

When the underwater structure is a breakwater 46 as shown in FIG. 5, a large quarry stone mound 48 is provided on the offshore side of the underwater structure foundation 36, and a medium quarry stone mound is provided on the coastal side. 50, the iron frame reef 52 is disposed at the front end of the mound 50, and a wave breaking block or the like is layered on the mounds 48, 50 to form the bank body 54.

Further, FIG. 6 shows a box-shaped frame body 20 in which a filling material 22 filled inside is closed by a screen material 18.
Another through-hole 56 is provided in the column member 16 disposed in the corner portion of the column, and the fluid supply pipe 34 of the high-pressure fluid generation / supply device 32 is detachably inserted into the through-hole 56. In the case of the base unit 58, in this case, not only the manufacturing cost of the base unit 58 can be reduced, but also the handling work at the construction site can be facilitated.

[0027]

As described above, according to the present invention, a basic unit consisting of a box-shaped frame body filled with a filling material such as rubble is placed on the underwater ground, and high-pressure fluid is supplied from the corner bottom of this basic unit. The floor material corresponding to the bottom of the base unit is removed by jetting or sucking the underwater ground, and the base unit is sequentially sunk to a predetermined depth to build the foundation for the underwater structure. Not only can floor excavation be omitted, inconveniences due to scouring can be prevented, and a flat foundation for underwater structures can be efficiently constructed, so the total cost can be reduced by shortening the construction period.

Further, the basic unit used for constructing the foundation for the underwater structure has a simple structure, and since the top is formed as a flat surface, the leveling work by the diver after the installation can be omitted and the ground can be surely secured. It has various advantages such as strong strengthening and stabilization.

Although the preferred embodiment of the method of constructing a foundation for an underwater structure and the foundation unit used for this construction according to the present invention has been described above, the present invention is not limited to this embodiment. When removing the bed material of the underwater ground by jetting the high-pressure fluid, a granular material such as sand in the vicinity is mixed with the high-pressure fluid to improve the efficiency of the removal work, etc. within the scope of the present invention. Of course, various changes can be made within.

[Brief description of drawings]

FIG. 1 is a perspective view of a box-shaped frame body that constitutes a base unit that is preferably used in a method of constructing a foundation for an underwater structure according to the present invention.

FIG. 2 is a perspective view of a base unit configured by using the box-shaped frame body shown in FIG.

FIG. 3 is a process explanatory diagram in the case of constructing a foundation for an underwater structure using the foundation unit shown in FIG.

FIG. 4 is an explanatory view of an artificial leaf constituted by the method for constructing a foundation for an underwater structure according to the present invention.

FIG. 5 is an explanatory view of a breakwater constructed by the method for constructing a foundation for an underwater structure according to the present invention.

FIG. 6 is a perspective view of another base unit used in the method for constructing a substructure for an underwater structure according to the present invention.

[Explanation of symbols]

10 Base unit, 12 Upper beam, 14
Lower beam members, 16 pillar members, 18 screen members, 20 box frame members, 22 filling materials, 24
Fluid passage, 26 connection coupler, 28 opening, 30 crane, 32 high pressure fluid generating and supplying device, 34 fluid supply pipe, 36 foundation for underwater structure, 38 artificial leaf, 40 foundation unit, 42 wave-dissipating block,
44 Covered block, 46 Breakwater, 48
Mound, 50 mound, 52 Wave-dissipating block, 54 Embankment, 56 Through hole, 58
Base unit,

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masaaki Hayasaka 2-7-1, Nishi-Shinjuku, Shinjuku-ku, Tokyo Japan Tetrapod Co., Ltd. (72) Inventor Takeshi Meguro 2-31, Gamohigashi-cho, Koshigaya, Saitama Prefecture ) Inventor Naoto Iwasa 4442-2 Uehongo, Matsudo-shi, Chiba (72) Inventor Kengo Hori 2-6-1 Shiomi, Isogo-ku, Yokohama-shi, Kanagawa

Claims (5)

[Claims] 1. A plurality of base units each having a box-shaped frame whose inside is filled with a filling material and whose top is closed by a lid are prepared, and then the structure is constructed by suspending and holding the base units. The base unit is placed on the submerged ground for the purpose of removing the floor material corresponding to the bottom of the base unit by jetting high-pressure fluid from the bottom of the corner of the box-shaped frame or by sucking the submersible ground to the base unit to a predetermined depth. A method of constructing a foundation for an underwater structure, which is characterized in that 2. When the high-pressure fluid is jetted from the bottom of the corner of the box-shaped frame or when the underwater ground is sucked, the jetting direction of the high-pressure fluid or the suction direction of the underwater ground is adjusted to remove the floor material. The method for constructing a foundation for an underwater structure according to claim 1. 3. A box-shaped frame body having an inside filled with a filling material and having a top closed by a lid, and a fluid passage is provided in a column member arranged at a corner of the box-shaped frame. A base unit for an underwater structure, characterized in that a connection portion with a high-pressure fluid supply device or a fluid suction device is provided at an upper end of the fluid passage, and a fluid injection port or a fluid suction port is provided at a lower end thereof. 4. The base unit for an underwater structure according to claim 3, wherein the jetting direction of the fluid jetting port or the suctioning direction of the fluid suction port arranged at the lower end of the fluid passage is adjustable. 5. A box-shaped frame body having an inner part filled with a filling material and a top portion closed by a lid body, and a through hole is provided in a column member arranged at a corner portion of the box-shaped frame body. A base unit for an underwater structure, wherein a fluid injection pipe of a high-pressure fluid supply device or a fluid suction pipe of a fluid suction device is detachably inserted and arranged in the through hole.