KR101119195B1 - Method for excavating submarine surface and constructing submarine vertical waterway - Google Patents

Abstract

PURPOSE: A sea floor excavation and construction method is provided to prevent the subsidence of a casing due to excessive excavating load by connecting a support to the casing. CONSTITUTION: A sea floor excavation and construction method is as follows. A jack-up barge(10) is fixed to arrange a casing in a dredging side. A guide frame is established in one side of the jack-up barge. The casing is up pulled to arrange the casing on the dredging side using the guide frame. The underwater concreting is poured in the circumference of the casing. A subsidence preventive support supporting the upper side of 'the underwater concreting placed in the outer circumference of casing is established. The excavator is inserted into casing and the dredging side is out dug perpendicularly.

Description

Submarine excavation and vertical sphere construction method {METHOD FOR EXCAVATING SUBMARINE SURFACE AND CONSTRUCTING SUBMARINE VERTICAL WATERWAY}

The present invention relates to a seabed excavation and vertical sphere construction method, and more particularly to a method for excavating the seabed and to construct a vertical sphere to perform deep intake and drainage of cooling water for industrial facilities.

In general, industrial facilities require a lot of industrial water, and in particular, power generation facilities are usually constructed in coastal areas to secure sufficient water resources.

As an example of the power generation facility, the nuclear power generation facility is a power generation facility for generating electricity by using steam generated by nuclear fission of uranium to make water in a steam generator and operating a turbine by the steam power.

The steam used to operate the turbine is cooled in the condenser, made of water, and sent back to the steam generator. At this time, the cooling water used is sea water, and after the steam is sufficiently cooled, the cooling water is discharged through the vertical hole of the sea bed.

However, the reason why the warm drainage is discharged from the deep is that when the warm drainage is discharged through the sea floor, the temperature of the seawater is mixed with the deep seawater, which is relatively low.

As such, the deep intake / drainage facility is mainly applied to a thermal power plant, a steel mill, and a general industrial facility in addition to a nuclear power plant, and Patent Publication No. 10-0929482 discloses a method for constructing a marine vertical ball for deep intake / drainage.

However, even through such a construction method, there is a problem that the casing installed to excavate the sea floor using an excavation method such as reverse circulation drill (RCD) method gradually sinks during the excavation work.

And when excavating the seabed surface with a large diameter in order to construct a large seabed vertical sphere, the excavation of such a large diameter seabed at once, there is a problem that the excavator is overloaded, causing the excavator failure.

The present invention is to solve the above-mentioned problems of the prior art, the purpose of which can prevent the settlement of the casing is installed for bottom drilling, it is possible to prevent the occurrence of excavator failure due to overload during the bottom drilling It is intended to provide a subsea excavation and vertical sphere construction method.

According to the present invention for achieving the above object, a) fixing the jack-up barge (jack-up barge) so that the casing can be disposed on the dredging surface; b) installing a guide frame on one side of the jack-up pants; c) lifting the casing and placing the casing on the dredging surface through the guide frame; d) placing underwater concrete on the outer periphery of the casing; e) installing a settlement preventing support for supporting the upper surface of the underwater concrete poured on the outer peripheral surface of the casing; f) inserting an excavator into the casing to excavate the dredge surface vertically; g) manufacturing the inner casing; h) inserting the inner casing into the casing and installing on the excavated portion of the dredging surface; And i) cutting and removing the protruding portion of the casing above the underwater concrete, wherein f) comprises: f-1) primary excavation with a diameter smaller than the inner circumference of the casing; And f-2) provides a subsea excavation and vertical sphere construction method comprising the step of secondary drilling to a diameter corresponding to the inner circumference of the casing.

The present invention can support the submerged concrete by connecting the subsidence support to the casing is installed for the bottom surface excavation to prevent the settlement of the casing, by dividing the bottom surface excavation in multiple stages to prevent the overload occurs in the excavator It is possible to provide a subsea excavation and vertical sphere construction method that can prevent the excavator from failing.

Figure 1 shows the step of fixing the jack-up pants.
Figure 2 shows the step of installing the guide frame on one side of the jack-up pants.
3 to 6 show the step in which the casing is lifted.
7A and 7B show the steps of installing the casing.
8 illustrates the step of stacking the dead stone.
9A to 10 illustrate a step of digging a dredging surface.
11A and 11B are schematic diagrams showing the steps in which the inner casing is manufactured.
12 to 14 illustrate the steps in which the inner casing is lifted.
15 shows an inner casing and some enlarged views to be installed in the excavated portion of the dredging surface.
16 and 17 show the step of fixing the inner casing.
18A to 18C illustrate steps of dredging the dead stone.
19 shows the steps of cutting and removing the casing.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is "connected" to another part, this includes not only "directly connected" but also "electrically connected" with another element in between. . In addition, when a part is said to "include" a certain component, which means that it may further include other components, except to exclude other components unless otherwise stated.

Subsea excavation and vertical sphere construction method according to the present invention will be described in the order of construction with reference to the drawings.

1 shows a step of fixing a jack-up barge, and dredging the proper position of the sea bottom to form a vertical sphere, that is, the inner casing 90, to form a dredging surface 1, and dredging Position the jack-up pants 10 on the sea so that the casing 50 can be installed on the surface 1 and then fixed by connecting with the dredging surface 1.

On the other hand, the dredging surface (1) formed in the step may be formed in various forms, for example, in the embodiment of the present invention is formed so that the shape of the cross section has an inverse rhombus shape. This is to ensure the convenience of the casing 50 to be described in the steps to be described later and the safety during finishing of the installation of the underwater concrete (4).

The jack-up pants 10 are installed to allow precise construction without being affected by sea level digging or tidal difference. In the embodiment of the present invention, the jack-up pants 10 are operated by a rack and pinion hydraulic system.

2 is a step of installing the guide frame 30 on one side of the jack-up pants 10, one side of the jack-up pants 10, more precisely facing the dredging surface (1) on which the casing 60 will be installed The guide frame 30 is installed at the position. For example, in the exemplary embodiment of the present invention, the guide frame 30 is formed in a frame shape as shown in FIG. 2, but may be formed in a plate-like body.

On the other hand, the guide frame 30 is mounted with a clamp 31 that can support the casing 50 to install the casing 50 on the dredging surface (1). The clamp 31 may be fixed to the upper portion of the casing 50 to lift the casing 50, and then move the dredging surface 1 to abut the lower portion of the casing 50.

3 to 6 show the steps of lifting the casing 50 sequentially.

3 to 6, first, the casing 50 may be moved to the flat pants 20 using the floating crane 40, wherein the casing 50 may be flat pants (as shown in FIG. 3). 20 may be disposed on the flat pants 20 in a horizontal direction. The casing 50 may be disposed to support a part of the casing 50 on the lifting frame 21 rotatably provided at one side of the flat pants 20.

After the casing 50 is disposed on the flat pants 20, the hook portion 60 of the floating crane 40 is connected to the other side of the casing 50 (one side supported by the lifting frame 21 of the flat pants 20). On the opposite side), wherein the flat pants 20 and the floating crane 40 can be arranged to intersect. When the flat pants 20 and the floating crane 40 are arranged to cross each other, as shown in FIGS. 3 to 6, the hook portion 60 of the floating crane 40 lifts one side of the casing 50 vertically. The flat pants 20 can rotate the casing 50 arranged in the horizontal direction while moving backwards (moving in the opposite direction to the direction in which the casing 50 is rotated).

In particular, since the lifting frame 21 provided in the flat pants 20 supports the casing 50, one side of the casing 50 is lifted vertically by the hook portion 60 of the floating crane 40. The other side of the ground casing 50 is concentrated in the direction opposite to the direction lifted by the hook portion 60, so that the casing 50 can be rotated from the horizontal direction to the vertical direction while the lifting frame 21 is rotated. Can help.

On the other hand, the hook portion 60 may include a main hook 61 and the auxiliary hook 63, the main hook 61 may be connected to one side of the casing 50 through the hook guide frame 61a, The auxiliary hook 63 may be connected to the outer circumferential surface of the casing 50. A plurality of main hooks 61 may be provided, and a plurality of main hooks 61 may be connected to one side of the casing 50 along the circumferential direction of the casing 50.

At this time, if the plurality of main hooks 61 are not connected to the casing 50 at regular intervals, the weight of the casing 50 is distributed evenly to the main hooks 61 and is not transmitted to each main hook 61 differently. If the weight of the casing 50 can be transmitted, and if the weight of the casing 50 is not evenly transmitted to the main hook 61, the center of gravity of the main hook 61 for lifting the casing 50 is disturbed and the casing ( There may be a problem such as 50) tilting.

Therefore, when the main hook 61 is connected to one side of the casing 50 through the hook guide frame 61a as described above, the plurality of main hooks 61 are previously connected to the hook guide frame 61a at regular intervals. The weight of the casing 50 may be evenly distributed to each main hook 61.

Like the main hook 61, a plurality of auxiliary hooks 63 may be provided, and the auxiliary hooks 63 may be connected to the outer circumferential surface of the casing 50 as described above. The outer circumferential surface of the 50 may be properly spaced apart from the main hook 61.

As the main hook 61 and the auxiliary hook 63 rotate the casing 50 from the horizontal direction to the vertical direction, the ratio of the weight of the casing 50 may be varied. That is, when the casing 50 starts to rotate in the vertical direction from the horizontal direction, the auxiliary hook 63 receives more weight of the casing 50, but as the casing 50 rotates in the vertical direction from the horizontal direction, the main hook ( 61 may receive more weight of the casing 50.

Meanwhile, the casing 50 lifted through the process as described above may be disposed on the dredging surface 1 through the guide frame 30.

When the casing 50 is disposed on the dredging surface 1, as shown in FIG. 7A, the casing 50 is supported with the clamp 31 fixed to the upper portion of the casing 50, and the lower portion of the casing 50 is provided. Pour the underwater concrete (4) to a height where it can be fixed.

Referring to FIG. 7B, a steel band 51 protruding in the circumferential direction is formed on the lower outer circumferential surface of the casing 50. For example, the steel band 51 is formed when the casing 50 is manufactured on land. The steel band 51 formed below the casing 50 is attached to the underwater concrete 4, so that the casing 50 is settled. Can be effectively prevented.

After placing the underwater concrete 4 to fix the casing 50, the settlement preventing support 100 is connected to the outer circumferential surface of the casing 50 as shown in FIG. 7B.

The settlement prevention support 100 includes a connection member 140 mounted on an outer circumferential surface of the casing 50, and a support member 110 fastened to the connection member 140 and extending outward of the casing 50.

The connecting member 140 may be pre-mounted when the casing 50 is manufactured on land before the casing 50 is installed on the dredging surface 1, or after the casing 50 is installed on the dredging surface 1. It can be mounted by a diver, the connecting member 140 may be mounted by bolt fastening or welding by way of example.

The support member 110 may be installed in advance in the casing 50, but for example, the support member 110 may be formed of a plurality of unit members having an “I” beam shape. In addition, the unit member may be connected to a separate connection part 130, for example, a connection part 130 such as a hinge (plate-shaped plate) by bolting. Meanwhile, the unit member may be connected using the connection member 140 instead of the connection component 130.

In particular, since the "I" beam is a commercially available ready-made product, it is easy to obtain, and since bolting between the "I" beams can be easily performed, it is possible to increase workability when the diver connects the unit members underwater. More stable and faster work can be achieved.

For example, the connecting member 140 and the supporting member 110 may be connected by installing a casing 50 on the dredging surface 1 and then diving into the seabed to fasten the bolts. If the anti-seizure support 100 is already installed before the casing 50 is placed on the dredging surface 1, the casing 50 may be caused by the anti-sediment support 100 that protrudes radially in the outer radial direction when the casing 50 is transported. The transportation of the 50 may be disturbed, and the settlement preventing support 100 may be damaged due to an impact during transportation.

Therefore, after the casing 50 is installed on the dredging surface 1, the work of connecting the anti-sedimentation support 100 separately in this manner may facilitate the carrying of the casing 50, and the anti-seizure support 100 ) Can be installed more stably.

In addition, the steel band 51 formed on the outer circumferential surface of the lower casing 50 and the anti-sink supporter 100 are organically combined on the outer circumferential surface of the casing 50 to prevent the subsidence of the casing 50 more effectively. That is, by further improving the adhesion of the casing 50 to the underwater concrete 4 through the steel band 51, and also by supporting the upper surface of the underwater concrete 4 through the anti-sedimentation support 100 of the casing 50 The effect of preventing settlement can be greatly improved.

After placing the casing 50 on the dredging surface 1 and pouring the underwater concrete 4, a step of stacking the sandstone 5 is performed as shown in FIG. 8. The sandstone 5 stacked on the upper side of the underwater concrete 4 serves to support the casing 50 in contact with the outer circumferential surface corresponding to the middle height of the casing 50.

When it is supported to the middle height of the casing (50) by the sandstone (5), the upper side of the casing (50) is shaken under the influence of the sea wave digging or tidal difference than when only the lower portion of the casing (50) is fixed and supported Since it can be prevented in the excavation step to be described later, the operation of introducing the excavator (70, 70 ') into the casing 50 can be carried out easily.

9A and 9B illustrate a step in which the excavators 70 and 70 'vertically excavate the dredging surface 1 through the casing 50, and the excavating step is mainly a first excavation step and a second excavation step. Is made of.

FIG. 9A illustrates a first excavation step, in which the first excavation step is an excavation using an excavator 70 which is excavated to a diameter smaller than the inner circumference of the casing 50, and FIG. 9B is a second excavation step. In this case, the second excavation step is to excavate using an excavator 70 'which is excavated to a diameter corresponding to the inner circumference of the casing 50.

On the other hand, corresponding to the inner circumference of the casing 50 in the secondary excavation step, when the excavator 70 'used in the secondary excavation step is introduced into the inner circumference of the casing 50, the outer circumferential surface of the excavator 70' and the casing ( The inner circumferential surface of the 50 may contact with the casing 50 and the excavator 70 'such that friction does not occur.

As described above, when digging the dredging surface (1), by dividing into the first and second excavation step it can be prevented from overloading the excavator when digging a large diameter at a time. Accordingly, the excavator can be prevented from being broken or damaged, so that a quick and stable excavation can be made rather than a case of digging a large diameter at a time.

Excavators 70 and 70 'have a special roller bit formed on the lower side of the dredging surface 1 in contact with the dredging surface 1 to crush the rock with 360 ° rotation. The crushed excavated soil is discharged through the drill rod pipe and collected on the soil carrier. And when excavating the dredged surface with the excavator (70, 70 ') to fill the water in the casing 50 and excavation can be excavated excavated soil in the form of slime like mud.

On the other hand, if the crushing stand 3 comes out during the excavation of the dredging surface 1 in the step of excavating the dredging surface 1, the excavation is stopped for a while, and the operation for preventing the collapse of the crushing wall can be made as shown in FIG. have.

The crushing stand collapsing prevention work is performed by first making and installing the underwater formwork 81 at the position where the crushing stand 3 is located and placing the underwater concrete 83 between the underwater formwork 81 and the crushing stand 3.

At this time, the underwater formwork 81 should be installed so that the outer peripheral diameter of the underwater formwork 81 is smaller than the diameter to be excavated to pour the underwater concrete 83 between the underwater formwork 81 and the crushing stand 3 as described above. Can be.

Excavating the dredging surface 1 is carried out to pull the inner casing 90 into the excavated portion, the excavation depth is excavated to be shorter than the height of the inner casing (90).

After the excavation is completed, as described above, the step of installing the inner casing 90 on the excavated portion of the dredging surface 1 is performed. The inner casing 90 installed in the excavated portion is pre-manufactured on land and then lifted and installed.

11A and 11B are schematic diagrams schematically showing the steps in which the inner casing 90 is manufactured. The inner casing 90 may fill the inside of the steel pipe to prevent the steel pipe from falling after lifting the steel pipe and placing the steel pipe upright.

After filling the water inside the steel pipe 90 ', reinforcement concrete is poured on the outer circumference of the steel pipe 90', first, a copper bar and a scaffold are installed around the outer circumference of the steel pipe 90 ', and the reinforcing bars are assembled. . And after installing the formwork around it, the concrete is poured between the outer periphery and formwork of the steel pipe (90 '). After that, the formwork is dismantled and the concrete is cured.

The step of pouring reinforced concrete on the outer circumference of the above-described steel pipe (90 ') may be made of a repetitive process by dividing the steel pipe by layers. For example, in the embodiment of the present invention, the step of pouring concrete step by step may be made as it proceeds from 1 to 5 steps as shown in Figure 11b.

Thus, the inner casing 90 to form the precast lining while pouring reinforced concrete on the outer circumference of the steel pipe (90 ') can be manufactured. Here, the precast lining refers to manufacturing the inner casing 90 so that a circular lining is formed when the cast concrete is precast and viewed from above.

Meanwhile, a lifting step of the inner casing 90 for pulling the inner casing 90 into the excavated portion of the dredging surface 1 after the inner casing 90 is manufactured is shown in FIGS. 12 to 14. Since the step of lifting the casing 90 is the same as the step of lifting the casing 50 to install the casing 50 in the above description, a description thereof will be omitted.

On the other hand, as can be seen with reference to Figure 15, the lower surface of the inner casing 90 may be provided with a drain valve 91, the lower side of the inner casing 90 may be provided with a bottom plate 92 The bottom plate 92 may be provided with a water flow valve 95. Since the drain valve 91 is provided under the peripheral surface of the inner casing 90, the drain pipe 91 may be connected to the drain valve 91 to drain water when the water filled in the inner casing 90 manufacturing step is drained. .

The water filled in the inner casing 90 is not drained immediately after the inner casing 90 is manufactured, but immediately before the inner casing 90 is installed. The reason is that if the air casing 90 is left without filling the inner casing 90, the inner casing 90 may be shaken or fallen due to wind load or the like. That is, in order to prevent such vibrations or movements, the interior of the inner casing 90 should be filled with water when standing on land.

Therefore, as described above, when the drain valve 91 provided at the lower portion of the inner casing 90 is lifted to pull the inner casing 90 into the excavated portion of the dredging surface 1, the interior of the inner casing 90 is removed. It can be used to drain the water filled in.

When the inner casing 90 is introduced into the excavated portion of the dredging surface 1, water may be filled in the inner casing 90 while the inner casing 90 enters the sea bottom to a predetermined depth. In this way, after filling the inner casing 90 with water, when the inner casing 90 is completed, the inner casing 90 is connected to the lower main line tunnel, and the inner casing 90 is connected to the lower main tunnel. The provided bottom plate 92 can be removed. At this time, before the bottom plate 92 is removed, the water filled in the inner casing 90 may be passed through the water flow valve 95 provided in the bottom plate 92 and the bottom plate 92 may be removed. .

In addition, as shown in FIG. 15, a plurality of bottom guides 93 may be further provided below the inner casing 90 along the circumferential direction of the inner casing 90. The bottom guide 93 serves to guide the inlet position of the inner casing 90 so that the inner casing 90 can be easily inserted when the inner casing 90 is introduced into the casing 50.

Therefore, as shown in FIG. 15, the bottom guide 93 may be provided to be inclined in the inner direction of the inner casing 90 toward the lower direction from the starting point of contact with the lower end of the inner casing 90.

After inserting the inner casing 90 into the excavated portion of the dredging surface 1, as shown in FIG. 16, the mortar 80 is injected between the inner casing 90 and the casing 50 to excavate the inner casing. To the fixed part.

Meanwhile, before the mortar 80 is injected to fix the inner casing 90, a step of temporarily fixing the inner casing 90 drawn into the excavated portion is performed as shown in FIG. 17, wherein the inner casing ( The inner casing 90 may be temporarily fixed to the casing 50 by the underwater stator 97 provided in advance above the 90.

In the step of temporarily fixing the inner casing (90), the diver may enter the casing (50) and fix one side of the underwater holding bracket (97) to the underwater welding (99) on the inner circumferential surface of the casing (50). As such, temporarily fixing the inner casing 90 may facilitate the injection of the mortar 80 in the above-described mortar injection step, and may have an effect of fixing the inner casing 90 at a more accurate position.

After fixing the inner casing 90 by mortar 80 injection, a step of dredging the dead stone 5 stacked on the outside of the casing 50 is performed. As shown in Figure 18a to 18c step by step according to the size of the stacked stacking stone (5) to remove the stepping stone (5) and finally the divers are mobilized to finish the work of removing the stone.

After the dead stone 5 is removed, a work of cutting the casing 50 is performed as shown in FIG. 19. The lower part of the casing 50 is fixed by the underwater concrete 4 in the above-mentioned step. Therefore, since it is difficult to separate the casing 50 from the underwater concrete 4, the diver cuts the casing 50 by using a cutter at a position corresponding to the upper side of the underwater concrete 4. That is, after cutting the casing 50, the construction of the inner casing 90 can be completed by lifting and removing the cut casing 50. In this way, the completed inner casing 90 may be referred to as a vertical seabed.

According to the construction method of the seabed vertical sphere (inner casing) according to the present invention, the step of excavating the dredging surface consists of the first excavation step and the second excavation step, when the excavator is excavated by the overload applied to the excavator when excavating a large diameter at one time You can get the effect of preventing flying.

And by digging the dredging surface before the excavation support is provided in the casing provided for the dredging surface excavation, it is possible to prevent the casing is settled during the excavation operation.

In particular, the anti-settling support is organically combined with the steel band formed on the outer side of the casing to improve the adhesion of the underwater concrete, it is possible to more effectively prevent the settlement of the casing.

The foregoing description of the present invention is intended for illustration, and it will be understood by those skilled in the art that the present invention may be easily modified in other specific forms without changing the technical spirit or essential features of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present invention is shown by the following claims rather than the above description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

1: dredge surface 3: crushing stand
4: underwater concrete 5: sandstone
10: Jack Up Pants 20: Flat Pants
21: lifting frame 30: guide frame
31: clamp 40: floating crane
50: casing 51: steel band
60: hook portion 61: main hook
61a: hook guide frame 63: auxiliary hook
70, 70 ': Excavator 80: Mortar
81: underwater formwork 83: underwater concrete
90: inner casing 91: drain valve
92: bottom plate 93: bottom guide
95: water flow valve 97: submersible fixture
99: underwater welding 100: anti-sediment support
110: support member 130: connecting parts
140: connecting member

Claims (20)

In the seabed excavation and vertical sphere construction method,
a) fixing the jack-up barge so that the casing can be placed on the dredging surface;
b) installing a guide frame on one side of the jack-up pants;
c) lifting the casing and placing the casing on the dredging surface through the guide frame;
d) placing underwater concrete on the outer periphery of the casing;
e) installing a settlement preventing support for supporting the upper surface of the underwater concrete poured on the outer peripheral surface of the casing;
f) inserting an excavator into the casing to excavate the dredge surface vertically;
g) manufacturing the inner casing;
h) inserting the inner casing into the casing and installing on the excavated portion of the dredging surface; And
i) cutting and removing a portion protruding upward of the underwater concrete of the casing,
Step f),
f-1) first drilling to a diameter smaller than the inner circumference of the casing; And
f-2) subsea excavation and vertical sphere construction method comprising the step of secondary drilling to a diameter corresponding to the inner circumference of the casing. The method of claim 1,
The settlement prevention support
A connection member mounted on an outer circumferential surface of the casing; And
Seabed excavation and vertical sphere construction method comprising a support member coupled to the connection member and extending in the outward direction of the casing. The method of claim 2,
The support member is a seabed excavation and vertical sphere construction method that is provided by fastening a plurality of unit members so that the weight is reduced during installation. The method of claim 3,
The plurality of unit members and the connecting member is bolted to each other subsea excavation and vertical sphere construction method. The method of claim 2,
The connecting member and the support member is an "I" beam is a seabed excavation and vertical sphere construction method. The method of claim 1,
The step c)
c-1) placing the casing in a flat pants in a horizontal direction and connecting the hook portion of the floating crane to the casing;
c-2) moving the flat pants horizontally and the floating crane lifting the casing vertically, thereby rotating the casing from the horizontal direction to the vertical direction; And
c-3) lifting and placing the casing on the dredging surface,
The flat pants are hinged to one side and includes a lifting frame rotatably supporting the casing,
The flat pants are subsea excavation and vertical sphere construction method to move in a direction opposite to the direction in which the casing is rotated. The method according to claim 6,
The flat pants and the floating crane is arranged to cross the seabed excavation and vertical sphere construction method. The method according to claim 6,
The hook portion,
A main hook connected to one side of the casing through a hook guide frame; And
And a sub hook connected to the main hook and connected to an outer circumferential surface of the casing. The method of claim 1,
Step g),
g-1) lifting the steel pipes and placing them in the manufacturing site;
g-2) filling water into the steel pipe to prevent the steel pipe from falling over;
g-3) completing the production of the inner casing to form precast lining by gradually pouring reinforced concrete on the outer circumference of the steel pipe; And
g-4) subsea excavation and vertical sphere construction method comprising the step of draining the water filled through the drain pipe connected to the drain valve provided in the lower portion of the steel pipe. 10. The method of claim 9,
Step g-3),
g-31) installing clubs and scaffolding around the steel pipe;
g-32) assembling reinforcing bars on the outer circumference of the steel pipe;
g-33) installing formwork around the steel pipe;
g-34) placing concrete between the outer circumference of the steel pipe and the formwork;
g-35) dismantling the formwork and curing the concrete; And
g-36) subsea excavation and vertical sphere construction method comprising the step of repeating the steps g-31) to g-35) on the cured concrete. 10. The method of claim 9,
Step g),
g-5) lifting the inner casing to remove the drain pipe and closing the drain valve after draining the filled water is complete; And
g-6) further comprising the step of mounting a guide member around the bottom of the inner casing to guide the insertion into the casing. The method of claim 1,
The step f) is a subsea excavation and vertical sphere construction method that is performed through two reverse circulation excavation device having a different diameter. The method of claim 1,
Step f)
f-3) if there is a crushing zone in the excavated portion, the step of the seabed excavation and vertical sphere construction method further comprises the step of preventing the collapse of the crushing wall. The method of claim 13,
Step f-3),
f-31) installing an underwater formwork at the location of the shredding stand; And
f-32) subsea excavation and vertical sphere construction method comprising the step of placing underwater concrete between the underwater formwork and the crushing zone. The method of claim 1,
The step e) is a seabed excavation and vertical sphere construction method comprising the step of stacking the sandstone on the upper side of the underwater concrete. The method of claim 15,
The step i) seabed excavation and vertical sphere construction method comprising the step of dredging the sandstone. The method of claim 1,
The bottom outer circumferential surface of the casing in which the underwater concrete is poured is provided with a steel band for improving the adhesion to the underwater concrete, seabed excavation and vertical sphere construction method. The method of claim 1,
Step h),
h-1) placing the inner casing in a flat pants in a horizontal direction and connecting the hook portion of the floating crane to the inner casing;
h-2) rotating said inner casing in a vertical direction by moving said flat pants horizontally and said floating crane lifting said inner casing vertically;
h-3) temporarily pulling the inner casing after introducing the inner casing into the excavated portion; And
h-4) injecting mortar to fix the inner casing,
The flat pants are hinged to one side and includes a lifting frame rotatably supporting the inner casing,
The flat pants are subsea excavation and vertical sphere construction method is to move in the direction opposite to the direction in which the inner casing is rotated. The method of claim 18,
The flat pants and the floating crane is arranged to cross the seabed excavation and vertical sphere construction method. The method of claim 18,
The hook portion,
A main hook connected to one side of the inner casing through a hook guide frame; And
Subsea excavation and vertical sphere construction method is connected to the main hook, including an auxiliary hook connected to the outer peripheral surface of the inner casing.

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