KR20160107431A - Underwater structure construction apparatus and construction method - Google Patents

Abstract

Disclosed is a construction device for an underwater structure. The construction device for an underwater structure is to construct an underwater structure which is a foundation constructed to strongly support a structure on an underwater bedrock. According to the embodiment of the present invention, the construction device for an underwater structure includes: a cylindrical cutting casing vertically installed under the water and cutting the ground or the bedrock under the water in a circular form while a driven gear and a bit are mounted on an upper end and a lower end and rotate; at least one grouting unit installed along the outer circumference of the cutting casing by being formed in the shape of a hollow pipe; and a driving unit providing a rotation force to the cutting casing and driving the cutting casing. The cutting casing receives a driving force of the driving unit through the upper end as the driven gear of the upper end is connected to the driving unit. The cutting casing also has a space capable of working by being formed in the shape of the hollow pipe.

Description

[0001] UNDERWATER STRUCTURE CONSTRUCTION APPARATUS AND CONSTRUCTION METHOD [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underwater structure construction apparatus and a construction method using the same, and more particularly, to an underwater structure construction apparatus for constructing an underwater structure that is a foundation for firmly supporting a structure on a underwater rocky region, .

In general, underwater structures are bases for constructing structures such as wind turbines, bridges and the like to be firmly supported on underwater rocky areas. As an example of constructing such an underwater structure, a reverse circulation drill (RCD) .

This reverse circulation excavation method is capable of drilling large-scale ground excavation while greatly reducing noise, and is one of the representative large-scale site-cast concrete pile construction methods together with earth drill method.

According to the above-described reverse circulation drilling method, compressed air is supplied to the drill bit through a drill string and a drill rod pipe immersed in water, and when compressed air is lifted through a pipe The resulting buoyancy is used to discharge excavated soil or fragmented rock fragments.

An equipment that excavates underwater rock masses through such a series of operations to enable the construction of reinforced concrete column-like foundations on the rock is called RCD Machine or RCD Rig.

In addition, the above-mentioned reverse circulation drilling method uses the RCD equipment to protect the pneumatic wall by hydrostatic pressure, to drill a drill hole in the ground by rotating a special drill bit mounted on the end of the drill rod pipe, This is a construction method in which a concrete pile, that is, an underwater structure, is applied to an underwater rock bed by inserting and pouring concrete.

In addition, in this reverse circulation excavation method, contrary to the circulation of water in the rotary boring method, the circulating water and the excavated soil are sucked together by the drill rod pipe and discharged to the ground, and the discharged circulating water is re- Repeat the circulation process sent to the ball.

However, according to the above-mentioned reverse circulation excavation method, since the complex structure concentrated on the upper mast of the RCD equipment, the entire apparatus is heavy, which makes it difficult to move and install it in the sea.

Particularly, the above-mentioned reverse circulation excavation method using RCD equipment has a limitation that the diameter of excavation holes drilled in underwater rocks can not exceed a maximum of 3,000 mm.

Such an underwater structure installed on a drilling hole having a diameter not exceeding 3,000 mm has a drawback that it can not firmly support a structure having a high weight such as a wind power generator or a bridge.

Therefore, in order to support a structure having such a high weight as mentioned above, it is essential to separate the rock structure through the sheet pile and then to excavate the underwater rock mass to install the underwater structure having the large diameter You must proceed.

These disadvantages are important factors to extend the construction period according to the construction of underwater structures with large diameter in underwater rock mass and increase the construction cost excessively.

The matters described in the background section are intended to enhance the understanding of the background of the invention and may include matters not previously known to those skilled in the art.

Korean Patent No. 10-0693285 (2007.03.05)

An embodiment of the present invention is to provide a construction apparatus for an underwater structure and a construction method using the same, which can shorten a construction period and reduce a construction cost when an underwater structure having a large diameter in a rocky underwater is constructed.

The apparatus for constructing an underwater structure according to an embodiment of the present invention includes: a cylindrical cutting casing installed vertically in water, having a driven gear and a bit mounted on an upper end and a lower end thereof and cutting the ground or rock in a circular shape while rotating; A grouting unit in the form of a hollow tube and provided at least one along the periphery of the cutting casing; And a drive unit for providing and rotating a cutting force to the cutting casing; Wherein the cutting casing has a space in which a driving gear of an upper end portion is connected to the driving unit to receive a driving force of the driving unit through an upper end portion and is formed in the shape of a hollow tube so as to be able to work therein.

Also, in the underwater structure construction apparatus according to the embodiment of the present invention, the drive unit may include at least one drive gear that rotates while being engaged with the driven gear of the cutting casing and rotates the cutting casing together with the driven gear; And a driving motor for driving the driving gear.

Further, in the apparatus for constructing an underwater structure according to an embodiment of the present invention, the drive gear may include a first drive gear engaged at one of outer sides of the driven gear; And a second drive gear engaged with the driven gear in a state of being separated from the first drive gear.

In the underwater structure construction apparatus according to an embodiment of the present invention, the first drive gear and the second drive gear may face the driven gear with respect to the driven gear.

In the apparatus for constructing an underwater structure according to an embodiment of the present invention, the drive gear is spaced apart from the first drive gear and the second drive gear, and between the first and second drive gears, A third driving gear engaged with the third driving gear; The driving gear may further include a fourth driving gear that is engaged with the driven gear while facing the third driving gear about the driven gear.

Further, in the underwater structure construction apparatus according to the embodiment of the present invention, the drive unit may further include a frame provided with an insertion hole into which the drive gear is mounted and the cutting casing is inserted inward.

In the apparatus for constructing an underwater structure according to an embodiment of the present invention, the grouting unit is composed of a plurality of pipes, an inlet through which the grout is injected is disposed below the drive unit, May be placed above the bit.

According to another aspect of the present invention, there is provided a method of constructing an underwater structure, the method comprising: setting an excavation point by measuring an excavation point; A float installing step of installing a float at the set excavation point; A jack-up pants installation step of installing at least one jack-up pants adjacent to the float; A cutting casing installation step of installing a cylindrical cutting casing for cutting a ground or rock in water at the excavation point with the float as a center; A driving unit mounting step of installing a driving unit for providing driving force to the cutting casing to rotate the jacking up pants; A cutting casing press-in step of rotating the cutting casing through the drive unit to cut the ground or rock in the water into a cylindrical shape and press-fitting the cutting casing into the underwater; A drainage step of draining the seawater stored in the cutting casing to the outside; An order step of taking outside of the cutting casing so that external seawater does not flow into the cutting casing; A rock removing step of removing a rock on the ground exposed inside the cutting casing; And a foundation forming step of forming a foundation on the excavation hole.

In addition, in the method of constructing an underwater structure according to an embodiment of the present invention, the jack-up pants installation step may be provided with jack-up pants separated from both sides of the float.

Further, in the method of constructing an underwater structure according to an embodiment of the present invention, the drive unit installation step installs the drive unit before the cutting casing installation step, and the drive unit is installed through at least one clamp, Up pants.

Further, in the method of constructing an underwater structure according to an embodiment of the present invention, the order step is a step of filling grout between the cutting casing and the cut underwater rock through a plurality of pipes provided outside the cut casing Lt; / RTI >

Further, in the method of constructing an underwater structure according to an embodiment of the present invention, the drilling operation can be performed through the breaker in the excavation step.

Further, in the method of constructing an underwater structure according to an embodiment of the present invention, a pipe is installed vertically in the water in the step of installing the cutting casing, and a pipe through which at least one grout is injected and discharged along the periphery, A cylindrical cutting casing may be provided in which the driven gear and the bit are mounted on the lower end to cut the ground or the rock in a circular shape while rotating.

Further, in the method of constructing an underwater structure according to an embodiment of the present invention, at the driving unit installing step, at least one driving gear rotated with the driven gear while being engaged with the driven gear of the cutting casing and rotating the cutting casing And a drive motor for driving the drive gear may be provided.

In the embodiment of the present invention, a breaker or a small excavator is put into a working space inside a cutting casing instead of performing an excavation work through the RCD equipment, which is a standardized equipment used in the prior art, You can puncture the ball.

That is, according to the embodiment of the present invention, it is possible to excavate the diameter of the excavation hole to a maximum extent by manual operation, thereby facilitating the installation of an underwater structure having a large diameter. Particularly, The underwater structure can be installed by pouring concrete.

Further, according to the embodiment of the present invention, since the excavation work is performed inside the cutting casing, it is possible to eliminate the use of the RCD equipment used in the prior art, The construction cost can be reduced.

In addition, effects obtainable or predicted by the embodiments of the present invention will be directly or implicitly disclosed in the detailed description of the embodiments of the present invention. That is, various effects to be predicted according to the embodiment of the present invention will be disclosed in the detailed description to be described later.

1 is a cross-sectional view of a construction apparatus for an underwater structure according to an embodiment of the present invention.
2 is a plan view of a construction apparatus for an underwater structure according to an embodiment of the present invention.
3 is an operational view of a construction apparatus for an underwater structure according to an embodiment of the present invention.
4 is a flowchart of a method of constructing an underwater structure according to an embodiment of the present invention.
5A to 5F are construction diagrams of a method of constructing an underwater structure according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

It is to be understood, however, that the present invention is not limited to the illustrated embodiments, and that various changes and modifications may be made without departing from the spirit and scope of the invention. .

In order to clearly illustrate the embodiments of the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the entire specification.

In the following description, the names of the components are denoted by the first, second, etc. in order to distinguish them from each other because the names of the components are the same and are not necessarily limited to the order.

And throughout the specification, when an element is referred to as " comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

Also, the term " unit " in the description means a unit of a comprehensive configuration that performs at least one function or operation.

FIG. 1 is a cross-sectional view of a construction apparatus for an underwater structure according to an embodiment of the present invention, and FIG. 2 is a plan view of a construction apparatus for an underwater structure according to an embodiment of the present invention.

Referring to FIGS. 1 and 2, a construction apparatus 1 for an underwater structure according to an embodiment of the present invention includes a cutting casing 10 and a part of a cutting casing 10 penetrating a central portion thereof, And a grouting unit (G).

The cutting casing 10 has a cylindrical shape and is vertically installed in the water. The driven gear 11 is mounted on the upper end of the upper casing and the bit 12 is mounted on the lower end of the cutting casing 10, Cut into a circle.

The cutting casing 10 preferably has a diameter (between 3,000 mm and 10,000 mm) larger than 3,000 mm, which is the diameter of the maximum drilling hole of the RCD equipment used in the prior art, ).

The bit 12 is applicable to various types of bits 12, and in the embodiment of the present invention, it is preferable that the bit 12 is made of a diamond bit having excellent hardness.

Further, the cutting casing 10 is connected to the driven unit 11 at the upper end of the driving unit 20 to receive the driving force of the driving unit 20 and is formed in the form of a hollow tube, And has a work space S capable of work.

The drive unit 20 is composed of a drive gear and a drive motor M. The drive gear meshes with the driven gear 11 of the cutting casing 10 and rotates together with the driven gear 11 in the cutting casing 10 ).

At this time, the driving gear includes first and second driving gears G1 and G2 opposed to each other around the driven gear 11, and driven gears 11 and 12 between the first and second driving gears G1 and G2. And second and fourth driving gears G3 and G4 which are opposed to each other with respect to the first and second driving gears G1 and G2.

The first to fourth driving gears G1, G2, G3 and G4 are engaged with the driven gear 11 in a state of being spaced apart from the outer side of the driven gear 11, ).

In the above description, the driving gear is composed of the first to fourth driving gears G1, G2, G3 and G4. However, the present invention is not limited thereto, and a larger number of driving gears or a smaller number of driving gears may be applied will be.

Further, the first to fourth driving gears G1, G2, G3, G4 and the driven gear 11 are applicable to various types of gears. For example, a gear having a cycloid tooth profile and an involute tooth profile may be mentioned.

The driving motor M drives the first to fourth driving gears G1, G2, G3 and G4 so as to vertically correspond to the first to fourth driving gears G1, G2, G3 and G4, And the first to fourth driving gears G1, G2, G3 and G4 are provided through the respective rotary shafts 21, respectively.

At this time, it is preferable that the driving motor M is composed of a hydraulic motor having a large torque, being easy to operate remotely, and having an advantage of easy adjustment, stop, and reverse rotation of the speed.

The drive unit 20 can be installed inside the frame 23 provided with the insertion hole 22 into which the cutting casing 10 is inserted inward. The frame 23 protects the driving unit, that is, the first to fourth driving gears G1, G2, G3 and G4, and the driving motor M from the outside, and makes it easy to install the driving unit on the outside.

The grouting unit G is formed in at least one shape along the circumference of the cutting casing 10 in the form of a hollow tube.

The grouting unit G may be formed of a plurality of pipes provided along the longitudinal direction of the cutting casing 10, and the upper end of the pipe comprises an inlet I into which the grout GT is injected.

At this time, the inlet is disposed below the driven gear 11 of the drive unit 20, and the lower end of the pipe is formed with a discharge port O through which the grout GT into which the injected grout is discharged, 12).

3 is an operational view of a construction apparatus for an underwater structure according to an embodiment of the present invention.

3, in a construction apparatus 1 for an underwater structure according to an embodiment of the present invention having such a construction, first, in order to install an underwater structure 30 in an underwater rock block 51, And the drive unit 20 is fixed to the jackup barge (40) through the frame (23).

In this case, it is preferable that the frame 23 is provided with two jack-up pants 40 spaced apart from each other and then fixed on both sides of the frame 23 while the jack-up pants 40 are used This is because, as is well known, there is a feature that the position change due to the elevation of the sea level or the wave does not occur.

Thereafter, the cutting casing 10 is vertically passed through the insertion hole 22 of the frame 23 using a crane or the like. At this time, the cutting casing 10 has a position when it is inserted into the insertion hole 22 so that the driven gear 11 and the first to fourth driving gears G1, G2, G3 and G4 of the drive unit 20 are engaged with each other Throttled while making fine adjustment.

When the cutting casing 10 and the drive unit 20 are engaged as described above, the drive unit 20 is driven. At this time, as the first to fourth driving gears G1, G2, G3 and G4 are rotated, the bit 12 cuts the ground surface F in the cutting casing 10.

At the same time, the cutting casing 10 is pressed into the underwater floor F by its own weight.

Here, the depth of the cut casing 10 in which the cutting casing 10 is press-fitted into the underwater surface F is preferably between 0.8 m and 1.5 m, and in the embodiment of the present invention, it is preferable that the depth is 1 m.

If this value is not reached or exceeded, the cutting casing 10 may be tilted under the influence of seawater by being pressed into the underwater floor F more than necessary.

When the cutting casing 10 is pressed into the underwater surface F as described above, the seawater SW stored in the cutting casing 10 is drained to the outside.

Subsequently, the grout GT is charged through the grouting unit G into the space between the cutting casing 10 and the cutting hole 50 formed in accordance with the cutting of the cutting casing 10, so that the manual work is performed.

The worker and the equipment are put into the internal work space S of the cutting casing 10 to excavate the underwater floor F exposed on the work space S.

Here, the excavation has a comprehensive meaning including the drilling of the underwater floor F to a certain depth and the operation of removing the rocks of the exposed ground.

Finally, concrete or the like is laid on the exposed water surface F as described above to provide an underwater structure 30 as a foundation for supporting a structure having a high weight such as a wind power generator, a bridge, or the like.

At this time, the underwater structure 30 is filled with a breaker or a small excavator into the internal work space S of the cutting casing 10, so that the RCD equipment used in the prior art can be eliminated.

In particular, when the cutting casing 10 having a diameter of 3,000 mm or more is used, it is easy to install the underwater structure 30 having a larger diameter than the RCD equipment having the excavated diameter of 3,000 mm or less at maximum.

In addition, even if a drilling operation is carried out, the diameter of the excavation hole can be maximally excavated as it proceeds manually by using a breaker or a small excavator or the like, so that it is easy to install the underwater structure 30 having a large diameter.

Accordingly, the construction apparatus 1 for an underwater structure according to an embodiment of the present invention can remove the use of a high-priced RCD apparatus, which is an expensive apparatus used in the prior art, So that the underwater structure 30 having a large diameter can be easily installed.

Furthermore, the construction apparatus (1) for an underwater structure according to the embodiment of the present invention can shorten the entire construction period and reduce the construction cost by eliminating the RCD equipment and the waste film construction.

Although not shown in the drawing, a separate adapter (not shown) may be provided between the cutting casing 10 and the drive unit 20. These adapters are provided for fitting the cutting casing 10 having various outer diameter sizes into the drive unit 20. [

Hereinafter, a construction method of an underwater structure 30 using the construction apparatus 1 for an underwater structure according to an embodiment of the present invention will be described in detail with reference to the drawings and the accompanying drawings.

FIG. 4 is a flowchart of a method of constructing an underwater structure according to an embodiment of the present invention, and FIGS. 5A to 5F are construction diagrams of a method of constructing an underwater structure according to an embodiment of the present invention.

Referring to FIGS. 4 and 5A to 5F together with the drawings, a method of constructing an underwater structure according to an embodiment of the present invention includes an excavation point setting step S1, a float installing step S2, a jack- (S3), and a cutting casing installation step (S4).

It also includes a drive unit installation step S5, a cutting casing press-in step S6, a drainage step S7, an order step S8, a rock removal step S9, and a basic molding step S10.

The excavation point setting step S1 is a step of measuring and setting an excavation point C to be excavated in order to construct a water turbine 30 having a large diameter on the sea.

The float installing step S2 is a step of installing a float at the excavation point C set in the excavation point setting step S1.

The jack-up pants installing step S3 is a step of installing at least one jack-up pants 40 in a state adjacent to the float installed in the float installing step S2.

At this time, it is preferable that the jack-up pants 40 to be installed face each other with a float therebetween, and the two jack-up pants 40 are provided in a spaced apart state.

The cutting casing installation step S4 is a step of installing a cylindrical cutting casing 10 for cutting a ground F or a rock in the water at the excavation point C around the float installed in the float installing step S2 .

At this time, the provided cylindrical casing 10 is vertically installed in the water and has a pipe-shaped grouting unit G in which at least one grout GT is injected and discharged along the periphery.

The cut casing 10 has a driven gear 11 mounted on the outer circumferential surface of the upper end portion and a bit 12 mounted on the lower end of the cut casing 10 to cut the ground surface F and the rock in a circular shape while rotating.

Here, the bit 12 is applicable to various types of bits 12, and it is preferable that the bit 12 is made of a diamond bit in the embodiment of the present invention.

The cutting casing 10 is in the form of a hollow tube and has a work space S in which work, that is, worker or equipment, can be put into operation.

The drive unit installation step S5 includes moving the drive unit 20 for providing a driving force to the cutting casing 10 installed in the cutting casing installation step S4 to rotate the jacket up pants 40 installed in the jack- As shown in FIG.

The drive unit 20 is provided with at least one drive gear for rotating the cutting casing 10 together with the driven gear 11 while being engaged with the driven gear 11 of the cutting casing 10, And a drive motor M for driving the gear.

More specifically, the drive unit 20 includes a drive gear and a drive motor M. The drive gear meshes with the driven gear 11 of the cutting casing 10 and rotates together with the driven gear 11, Thereby rotating the casing (10).

At this time, the driving gear includes first and second driving gears G1 and G2 opposed to each other around the driven gear 11, and driven gears 11 and 12 between the first and second driving gears G1 and G2. And second and fourth driving gears G3 and G4 which are opposed to each other with respect to the first and second driving gears G1 and G2.

The first to fourth driving gears G1, G2, G3 and G4 are engaged with the driven gear 11 in a state of being spaced apart from the outer side of the driven gear 11, ).

In the above description, the driving gear is composed of the first to fourth driving gears G1, G2, G3 and G4. However, the present invention is not limited thereto, and a larger number of driving gears or a smaller number of driving gears may be applied will be.

Further, the drive gear and the driven gear 11 are applicable to various types of gears, for example, gears having a cycloid tooth profile and an involute tooth profile.

The driving motor M drives the first to fourth driving gears G1, G2, G3 and G4 so as to vertically correspond to the first to fourth driving gears G1, G2, G3 and G4, And the first to fourth driving gears G1, G2, G3 and G4 are provided through the respective rotary shafts 21, respectively.

At this time, it is preferable that the driving motor M is composed of a hydraulic motor having a large torque, being easy to perform automatic remote control, and having an advantage that the speed can be adjusted, stopped and reversed easily.

The driving unit 20 may be installed inside the frame 23 provided with the insertion hole 22 into which the cutting casing 10 is inserted inward. This frame 23 protects the drive unit 20, that is, the first to fourth drive gears G1, G2, G3 and G4 and the drive motor M from the outside, .

The frame 23 may also be fixed on the jack-up pants 40 through at least one clamp 41 to be securely fastened to the jack-up pants 40. Various types of clamps 41 are applicable to the clamp 41, which is a well-known technique widely used in the art, and a detailed description thereof will be omitted.

On the other hand, it is preferable that the driving unit mounting step S5 is performed before the cutting casing mounting step S4.

That is, the frame 23 provided with the drive unit 20 is first installed in the jack-up pants 40, and the cutting casing 10 is vertically placed in the insertion hole 22 of the frame 23 using a crane or the like Through.

At this time, the cutting casing 10 is positioned at the position (position) when the driven gear 11 is inserted into the insertion hole 22 so that the first to fourth driving gears G1, G2, G3, G4 of the drive unit 20 are engaged with each other. .

When the cutting casing 10 and the drive unit 20 are engaged as described above, the cutting casing pressing-in step S6 is performed.

The cutting casing press-in step S6 is performed by rotating the cutting casing 10 engaged with the drive unit 20 so as to cut the ground surface F in the water or the rock into a cylindrical shape, .

That is, when the drive unit 20 is driven, the first to fourth drive gears G1, G2, G3 and G4 rotate to rotate the cutting casing 10, And the cutting casing 10 is press-fitted into the underwater rocking block 51 simultaneously with cutting by its own weight.

At this time, the depth of the cut casing 10 to be press-fitted into the underwater rocking block 51 is suitably adjusted to a depth of between 0.8 m and 1.5 m, and in the embodiment of the present invention, it is preferable that the cutting casing 10 is press-

If the numerical value is not exceeded or less than this value, the cutting casing 10 may be press-fitted into the ground F more than necessary, or the cutting casing 10 may be tilted under the influence of seawater.

When the cutting casing 10 is press-fitted into the underwater rocking block 51 as described above, the drainage step S7 is performed.

The drainage step S7 drains the seawater SW stored in the inside of the cutting casing 10 by using a drain pump (not shown) or the like so that the inside of the cutting casing 10 can be operated .

The order step S8 is an order step for preventing the external seawater from flowing into the internal work space S of the cutting casing 10.

This order step S8 is performed through a grouting unit G in the form of a hollow tube and provided along at least one circumferential surface of the cutting casing 10.

The grout unit G is composed of a plurality of pipes and the inlet I into which the grout GT is injected is disposed below the driven gear 11 of the drive unit 20, Is disposed above the bit (12).

Accordingly, in the step S8, the grout GT is filled in the space between the cutting casing 10 and the cutting hole 50 formed along the cutting of the cutting casing 10 through the grouting unit G We go hand-in-hand.

Meanwhile, in the step S8, a plurality of drilling operations may be performed toward the underwater rocking block 51 within the cutting casing 10, and a step of infiltrating the drilling material into the drilled holes may be performed manually.

 Accordingly, the cutting casing 10, which is press-fitted into the ground surface F in the water, has an environment in which the worker and equipment can be put in the internal work space S, Can be deleted.

The rock removing step S9 is a step of removing rocks on the ground surface F exposed on the inner work space S of the cutting casing 10 finished by the manual work in the order step S8.

At this time, in the rock removing step S9, the removal of the rocks and the exposed ground surface F may be excavated to a predetermined depth to form excavation holes.

Further, the rock removing step S9 may proceed before the order step S8. That is, the rocks generated during the operation can be finely crushed and discharged to the outside through the grouting unit G made of pipes.

At this time, the external discharge of the rock can supply the compressed air to the inside of the pipe through the compressor or the like, and can be discharged to the outside using the pressure of the compressed air supplied.

In the foundation forming step S10, concrete or the like is placed on the underground floor F through the rock removing step S9 to install an underwater structure 30 as a foundation for supporting a structure having a high weight such as a wind power generator, a bridge, .

At this time, the underwater structure 30 may be installed by drilling the underwater floor F to a certain depth and placing concrete or the like in the perforated hole.

This basic molding step S10 is a step in which a breaker or a small excavator is put into the internal work space S of the cutting casing 10 and is used for the excavation when the underwater structure 30 is installed in the prior art It is possible to delete the RCD device.

Particularly, when the cutting casing 10 having a diameter of 3,000 mm or more is used, the installation of the underwater structure 30 having a larger diameter can be facilitated compared to an RCD machine in which the excavated diameter is excluded only up to 3,000 mm or less .

Further, even if the digging operation is performed on the underwater floor F, the diameter of the excavation hole can be maximized by manual operation using a breaker or a small excavator, so that it is easy to install the underwater structure 30 having a large diameter .

The method of constructing an underwater structure according to an embodiment of the present invention can eliminate the construction of the RCD equipment and the caulking membrane used in the prior art through the steps described above, thereby reducing the entire construction period and construction cost have.

Further, in the method of constructing an underwater structure according to an embodiment of the present invention, the underwater structure 30 having a larger diameter than the prior art can be easily installed on the underwater floor F through the above steps.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, And all changes to the scope that are deemed to be valid.

1: Construction apparatus for underwater structure 10: Cutting casing
11: driven gear 12: bit
S: Workspace F: Floor
SW: Seawater 20: Drive unit
21: rotation shaft 22: insertion hole
23: frame M: drive motor
G1: first drive gear G2: second drive gear
G3: third drive gear G4: fourth drive gear
30: underwater structure 40: jack-up pants
41: Clamp 51: Underwater rock mass
52: injection material C: excavation point
G: Grouting unit GT: Grout
I: inlet O: outlet

Claims (14)

A cylindrical cutting casing vertically installed in the water and having a driven gear and a bit mounted on the upper and lower ends thereof to cut the ground or rock in the water into a circular shape while rotating;
A grouting unit in the form of a hollow tube and provided at least one along the periphery of the cutting casing; And
A drive unit for providing a rotational force to the cutting casing to drive the cutting casing; / RTI >
The cutting casing
Wherein the drive unit is connected to a driven gear at an upper end thereof to receive a driving force of the drive unit through an upper end thereof and is formed in the shape of a hollow tube and has a space in which it can be operated. The method according to claim 1,
The drive unit
At least one drive gear engaged with the driven gear of the cutting casing to rotate the cutting casing together with the driven gear; And
A driving motor for driving the driving gear;
And a plurality of projections. 3. The method of claim 2,
The drive gear
A first drive gear engaged at one of the outer sides of the driven gear; And
A second driving gear engaged with the driven gear in a state of being separated from the first driving gear;
And a plurality of projections. The method of claim 3,
The drive gear
Wherein the first drive gear and the second drive gear are opposed to each other about the driven gear. 5. The method of claim 4,
The drive gear
A third drive gear spaced from the first drive gear and the second drive gear and meshing with the driven gear between the first and second drive gears; Further comprising:
The drive gear
A fourth drive gear which is meshed with the driven gear and faces the third drive gear about the driven gear; Further comprising: a support structure for supporting the underwater structure. 3. The method of claim 2,
The drive unit
A frame having an insertion hole to which the driving gear is mounted and the cutting casing is inserted inward; Further comprising: a water supply device for supplying water to the underwater structure. The method according to claim 1,
The grouting unit
A plurality of pipes,
Wherein an inlet through which the grout is injected is disposed below the drive unit and a lower outlet through which the injected grout is discharged is disposed above the bit. An excavation point setting step of measuring excavation points to set excavation points;
A float installing step of installing a float at the set excavation point;
A jack-up pants installation step of installing at least one jack-up pants adjacent to the float;
A cutting casing installation step of installing a cylindrical cutting casing for cutting a ground or rock in water at the excavation point with the float as a center;
A driving unit mounting step of installing a driving unit for providing driving force to the cutting casing to rotate the jacking up pants;
A cutting casing press-in step of rotating the cutting casing through the drive unit to cut the ground or rock in the water into a cylindrical shape and press-fitting the cutting casing into the underwater;
A drainage step of draining the seawater stored in the cutting casing to the outside;
An order step of taking outside of the cutting casing so that external seawater does not flow into the cutting casing;
A rock removing step of removing a rock on the ground exposed inside the cutting casing; And
A base forming step of forming a base on the exposed surface; The method comprising the steps of: 9. The method of claim 8,
The jack-up pants installation step
And jack-up pants are provided on both sides of the float in a spaced-apart manner. 9. The method of claim 8,
The driving unit installing step
Characterized in that the drive unit is installed before the cutting casing installation step, characterized in that the drive unit is installed on the jack-up pants through at least one clamp 9. The method of claim 8,
The order step
And filling the grout between the cutting casing and the cut underwater rock through a plurality of pipes provided on the outside of the cutting casing. 9. The method of claim 8,
In the rock removal step
And removing the rock through the breaker. 9. The method of claim 8,
In the cutting casing installation step
A pipe provided vertically in the water and provided with at least one grout along the circumference of the outer circumferential surface thereof for injecting and discharging the grout; a driven gear and a bit disposed at the upper and lower ends thereof for rotating the water- Characterized in that a cutting casing is provided. 14. The method according to claim 8 or 13,
In the driving unit installing step
At least one drive gear which is engaged with the driven gear of the cutting casing to rotate the cutting casing together with the driven gear while being rotated, and a drive unit including a drive motor for driving the drive gear, .

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