KR20150121514A - Construction method of trench underwater - Google Patents

Abstract

Disclosed is a method of constructing a trench underwater. The method of constructing a trench underwater includes: (a) a step of arranging a guide structure forming a straight band area by having a plurality of holes formed on one side of a barge ship continuously in a line to be overlap with each other at a position corresponding a trench construction intended spot; and (b) a step of forming a straight band-shaped trench corresponding to the straight band area by performing ground excavation with an excavation unit of excavation equipment inserted into the holes.

Description

CONSTRUCTION METHOD OF TRENCH UNDERWATER [0002]

The present invention relates to a method of constructing an underwater trench.

Generally, in the underwater ground of the river and the sea floor, various cables such as a communication cable, a power line, etc., or underwater digging having a predetermined depth and width of about 1 m to 5 m in order to form a trench for installation of various pipes such as an oil pipeline, Can be achieved.

Such underwater excavation is usually performed by an underwater drilling apparatus disposed in water, an excavating equipment provided in the submersible, or the like. However, such a conventional underwater excavation is inefficient because the underwater excavation apparatus, submersible vessel, etc. are dropped by the submerged ground and the work is required for this purpose. Accordingly, the construction period is lengthened, ), Labor costs, and the like.

In addition, when the rocks appear early in the shallow depth of the ground during the excavation work, it is necessary to add equipment for crushing the rock in order to crush the rock in a limited space such as underwater, so that additional cost and time are required.

In addition, underwater drilling apparatuses, submersibles, and the like perform work in water. In order to accurately check whether the trenches are formed according to the planned route and scale, it is necessary to periodically communicate with the ground or perform surveying.

It is an object of the present invention to provide an underwater trench construction method capable of securing efficiency and economical efficiency in the construction of a trench in water.

According to a first aspect of the present invention, there is provided a method of constructing an underwater trench according to the first aspect of the present invention, comprising: (a) a plurality of holes partially overlapping each other on one side of a barge corresponding to a trench construction expected point, Disposing a guide structure which is formed by a plurality of grooves and which forms a straight strip region; And (b) forming an excavation portion of the excavation equipment by inserting into each of the plurality of holes to perform ground excavation, thereby forming a straight strip-shaped trench corresponding to the straight strip region.

Meanwhile, the guide structure according to the second aspect of the present invention includes a guide structure used for underwater trench construction, wherein a plurality of holes are partially overlapped and formed continuously to form a straight band region, May have a size and shape corresponding to the drilling bore of the drilling rig.

According to the above-mentioned problem solving means of the present invention, the excavation portion of the excavation equipment is inserted into each of the plurality of holes forming the rectilinear band region to perform the ground excavation, so that the trench corresponding to the rectilinear band region can be formed. It is possible to easily perform the trench construction while reducing the labor cost and the time cost by using the drilling equipment disposed.

That is, according to the task solution of the present application, underwater trench construction can be carried out by using a small-sized excavating equipment such as a guide structure disposed in an aquarium and a PRD excavating equipment commonly used on the land, that is, a commercial excavating equipment, The accuracy, efficiency, and economical efficiency of the system can be improved. Also, since the excavating equipment is disposed on a barge (jack-up pants) rather than underwater, and excavation is performed by using the guide structure 1, it is free from the restriction of working time and weather conditions due to the use of a diver, a submersible, And the construction period can be shortened.

Particularly, even if a trench is built in the ground where rocks appear early at the depth where the trench is formed during excavation, the small and medium excavation equipment used for rock crushing excavation in the land such as PRD excavation equipment is used. It can be smoothly performed without any limitations.

In addition, the drilling rig placed on the barge is guided exactly through the straight strip zone of the guide structure disposed in the aqueduct, and the trench is excavated. If only the vertical digging of the drilling rig is set correctly, Since the position (route) under construction is vertically projected to the linear strip region of the guide structure, the trench can be accurately installed along the planned path, and the confirmation of the position of the straight strip region of the guide structure exposed to the water .

1 is a flowchart of a water trench construction method according to an embodiment of the present invention.
FIG. 2 is a flowchart of a step of forming a straight strip-shaped trench according to an embodiment of the present invention.
3 is a flow chart of steps for forming a straight strip-shaped trench according to another embodiment of the present application.
4 is a schematic perspective view showing a guide structure according to one embodiment of the present invention mounted on a barge;
5 is a schematic plan view showing a barge on which a guide structure according to an embodiment of the present invention is mounted.
6 is a schematic diagram for explaining a water trench construction method according to an embodiment of the present invention.
7 is a schematic diagram for explaining a process of forming a straight strip-shaped trench using a sand filling part.
8 is a schematic conceptual view showing a part of the ground to explain a change in the state of the ground when the step of forming the straight strip-shaped trench according to one embodiment of the present invention is performed using the guide casing.
FIG. 9 is a schematic conceptual diagram showing a part of the ground to explain a change in the ground state when performing the step of forming a straight strip-shaped trench according to one embodiment of the present invention by using the sand filling part.
10 is a schematic diagram for explaining a state change of the ground when performing the step of forming a straight strip-shaped trench according to another embodiment of the present invention by using a guide casing.
11 is a schematic perspective view for explaining a guide casing according to an embodiment of the present invention;
12 is a schematic perspective view for explaining a guide casing according to another embodiment of the present invention;
13 is a flowchart of a step S100 of arranging a guide structure on one side of a barge corresponding to a trench construction scheduled point 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 so that those skilled in the art can easily carry out the present invention. It should be understood, however, that the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In the drawings, the same reference numbers are used throughout the specification to refer to the same or like parts.

Throughout this specification, when a part is referred to as being "connected" to another part, it is not limited to a case where it is "directly connected" but also includes the case where it is "electrically connected" do.

Throughout this specification, when a member is " on " another member, it includes not only when the member is in contact with the other member, but also when there is another member between the two members.

Throughout this specification, when an element is referred to as "including " an element, it is understood that the element may include other elements as well, without departing from the other elements unless specifically stated otherwise. The terms "about "," substantially ", etc. used to the extent that they are used throughout the specification are intended to be taken to mean the approximation of the manufacturing and material tolerances inherent in the stated sense, Accurate or absolute numbers are used to help prevent unauthorized exploitation by unauthorized intruders of the referenced disclosure. The word " step (or step) "or" step "used to the extent that it is used throughout the specification does not mean" step for.

The present invention relates to a method of constructing an underwater trench.

First, an underwater trench construction method (hereinafter referred to as " underwater trench construction method ") according to one embodiment of the present application will be described.

Referring to FIG. 1, the submerged trench construction method includes a step (S100) of arranging a guide structure 1 on one side of a barge corresponding to a trench construction scheduled point.

6 (a) and 6 (b), the guide structure may be disposed on one side of the barge 900 that has been set. Barge 900 may be, for example, a jackup barge. 6 and 7, the barge line 900 can be fixed to the hull by a jack-up leg fixed to the seabed ground. Accordingly, the influence of the difference in wave height or sea level acting on the barge 900 can be minimized, so that the construction can be finely and stably performed.

Further, the trench construction expected point can be determined by the construction plan and can be measured by a GPS (Global Positioning System) by way of example.

13, in step S100, the guide structure 1 is installed on the barge 900 in a direction perpendicular to the straight band zone 19, and at least two of the plurality of fastening holes 931 formed at intervals along the first horizontal direction And placing the barge 900 on one side of the barge 900 (step S110).

As described above, the first horizontal direction is a direction parallel to the linear direction in which the straight band region 19 is formed, and corresponds to the direction of 12 o'clock -6 o'clock in FIG. That is, the plurality of fastening holes 931 may be arranged at intervals of 12 to 6 o'clock as viewed in Fig.

Referring to FIG. 4, the guide structure 1 may have a fastening portion that can be fastened to at least two of the plurality of fastening holes 931. Illustratively, as shown in FIG. 4, both sides of the guide structure 1 may be fastened to two or more of the plurality of fastening holes 931, respectively. Further, the fastening holes 931 to which the guide structure 1 is fastened can be changed if necessary.

5, when the arrangement position of the guide structure 1 is grasped by a survey or the like that there is an error with respect to the trench construction expected point with respect to the direction of 12 o'clock -6 o'clock, that is, the first horizontal direction, The structure 1 can be moved to the fastening holes 931 where the error can be further reduced and fastened. In other words, it is possible to adjust the position of the guide structure 1 in the first horizontal direction according to the method of coupling the guide structure 1 to the plurality of fastening holes 931 arranged in the direction in which the straight strips are formed.

In other words, the selective fastening of the guide structure 1 to two or more of the plurality of fastening holes 931 can be achieved by a plurality of fastening holes 931 provided in the guide structure 1 It is possible to select the fastening hole 931 to be fastened.

13, step S100 may include a step S130 of selectively positioning the guide structure 1 disposed at one side of the barge line 900 along a direction approaching or departing from the barge line 900 . Here, the direction in which the barge line 900 is moved closer to or away from the barge line 900 may be, for example, a second horizontal direction orthogonal to the first horizontal direction side by side with the straight band region 19. [ Specifically, referring to FIG. 5, the second horizontal direction may be a 9: 3-o'clock direction.

Selective position adjustment of the guide structure 1 along the direction approaching the barge 900 and the direction away from the barge 900 (e.g., the second horizontal direction) can be accomplished by a linear drive unit. Illustratively, the linear drive unit may be, but is not limited to, a drive unit such as a hydraulic cylinder.

At least one of the steps S110 and S130 may be repeated until the positional error between the position of the guide structure 1 and the trench construction expected point is reduced to within a predetermined tolerance.

For example, if the position error in the second horizontal direction is reduced by performing step S110 after performing step S110, if the position error is not decreased within the preset tolerance, step S110 is performed again, 1 can be fixed to the other fastening holes 931 by adjusting the position in the first horizontal direction.

Alternatively, only the step S110 may be repeatedly performed to continuously adjust the position of the guide structure 1 with respect to the first horizontal direction. Alternatively, only the step S130 may be repeatedly performed to guide the guide structure 1 with respect to the second horizontal direction, May be continuously adjusted.

The background in which steps S110 and S130 are performed is as follows.

Since the survey work in the maritime work is sensitive to weather factors such as wind and waves and the maritime conditions, precise surveying work is required. Even if the surveying work is done more precisely than the predetermined work, the surveying error often occurs more than the tolerance.

Therefore, a process for minimizing such a measurement error is required, and the processes may be steps S110 and S130. That is, the position of the guide structure 1 can be adjusted by moving the position of the guide structure 1 in the horizontal direction (combination of the first horizontal direction and the second horizontal direction) through steps S110 and S130.

Further, the guide structure 1 may include the following configuration.

Referring to FIGS. 4 and 5, the guide structure 1 includes a guide portion which partially overlaps a plurality of holes and is continuously formed in a row to form a straight strip region 19. As shown in FIG.

Referring to FIG. 5, each of the plurality of holes may have a size and shape corresponding to the bore of the excavation equipment 910. As will be described later, the excavation portion of the excavation equipment 910 is inserted into each hole to perform the ground excavation, and each of the plurality of holes may have a size and shape such that insertion, removal and excavation of the excavation portion can be easily performed.

For reference, the minimum width of the overlapping portions of the plurality of holes can correspond to the minimum width of the trench to be constructed. The trenches to be constructed according to the construction plan have a width that can be formed for the installation of various pipes such as communication cables, power lines, etc., or pipelines such as oil pipelines, water pipes, etc. The minimum width of the overlapping portions of the plurality of holes is the minimum width Or may be within an error range.

In addition, the guide structure may include a separate connecting unit (not shown in the drawings) for mounting to the barge 900 (see Figs. 4 and 5).

6 (c), the present underwater trench construction method may include a step in which the excavation equipment 910 is set. The step of setting the excavation equipment 910 may be performed before the step S300 of forming the straight strip-like trench described below.

Referring to FIGS. 1 and 6 (d), the underwater trench construction method is characterized in that the excavation portion of the excavation equipment 910 is inserted into each of the plurality of holes to perform ground excavation, And forming a strip-shaped trench (S300).

In the step S300, forming the straight strip-shaped trench corresponding to the straight strip region 19 may mean forming a trench having a shape matching the straight strip region 19. [ Here, the shape of the trench matched with the straight strip region 19 means the shape of the trench which can be formed when the excavation portion is guided and inserted in a state of being vertically inserted into each hole of the straight strip region 19 do. Therefore, the shape of the trench may be formed to be substantially the same as that of the straight band region 19, or to be somewhat expanded than the straight band region 19 due to the nature of the ground excavation.

Illustratively, the straight band region 19 shown in Fig. 5 has a straight band shape in which a plurality of holes are partially overlapped and continuously formed. In Figs. 8 (d), 9 (d) and 10 ), The straight line-shaped trench formed on the ground may also be in the form of a straight strip formed by successively overlapping a plurality of basic holes. 8 (d), 9 (d) and 10 (e) are schematic conceptual diagrams showing a part of a straight band-shaped trench formed on the ground.

The excavation equipment 910 may also be a commercial excavation equipment, such as a small to medium excavation equipment. That is, according to the underwater trench construction method, a trench is constructed by using a commercially available excavation equipment such as underwater underground excavation equipment, submersible equipment, etc., can do. Illustratively, PRD excavation equipment may be applied to the excavation equipment 910.

One implementation of step S300 may be as follows.

Referring to FIGS. 2, 8A and 9A, in step S300, the excavated part is inserted into each of the odd-numbered holes of the guide structure to perform ground excavation, 91 (S311).

The fact that the excavation section is inserted in each odd-numbered hole to perform the ground excavation can mean that the excavation section is skipped by one hole to perform the ground excavation. Illustratively, the excavation unit may be inserted into one hole to perform the ground excavation, then skip the adjacent second hole, insert it into the third hole adjacent to the second hole, and perform ground excavation. Accordingly, a plurality of preceding holes 91 formed in the ground can be formed at a certain distance from each other as shown in Figs. 8A and 9A.

Referring to FIG. 2, step S300 may include a step S312 of forming a trailing excavation guide (to be described later) for each of a plurality of preceding preceding holes 91 formed.

Illustratively, a plurality of preceding holes 91 having a trailing excavation guide section may be as shown in Figs. 8 (b) and 9 (b). 8 (b) shows the case where the trailing excavation guide portion is the guide casing 8, and FIG. 9 (b) shows the case where the trailing excavation guide portion is the sand-filled portion.

Referring to FIG. 2, step S300 may include a step S313 of forming a plurality of trailing basic holes 93 in the ground by performing ground excavation by inserting the excavator into every even-numbered hole among a plurality of holes.

In step S311 that the excavation section is inserted every even-numbered hole, it means that the excavation section is inserted in every skipped hole in which the excavation section is not inserted. 8 (c) (the case where the trailing excavation guide portion is the guide casing 8), and Fig. 9 (c) (when the trailing excavation guide portion is the sand-filled portion), the ground after the steps S311- ). ≪ / RTI >

At this time, the preceding base hole 91 and the trailing base hole 93 are partially overlapped with each other and formed continuously to form a straight-line-shaped trench.

Referring to FIG. 2, step S300 may include a step S314 of removing a trailing excavation guide portion after forming a plurality of trailing holes 93.

By performing steps S311 to S314, a part of the formed straight-line-shaped trench may be as shown in Figs. 8 (d) and 9 (d).

According to one embodiment of the above-described step S300, the trailing excavation guide portion is disposed in the preceding trajectory 91 before the trailing trajectory 93 is formed, so that the soil formed at the time of forming the trailing trajectory 93 becomes the preceding trajectory 91). Thus, the present underwater trench construction method can be easily performed.

Meanwhile, the trailing excavation guide unit according to one embodiment of the present invention may be a guide casing 8. As described above, the preceding basic hole 91 in which the guide casing 8 is disposed may be, for example, as shown in FIG. 8 (b).

The outer circumferential surfaces on both sides of the guide casing 8 can be recessed and recessed so as to guide excavation of the trailing base air, as shown in Figs. 8 (b) and 11.

As shown in Figs. 8 and 11, the outer circumferential surfaces on both sides of the guide casing 8 can be concavely curved in an arcuate shape so that the trailing trajectory 93 overlaps with the preceding trajectory 91 partially.

The guide casing 8 may be provided with a flow preventing protrusion (not shown in the drawing) along the height direction on the outer peripheral surface thereof so as to prevent the flow in the preceding base hole 91. [ Referring to Fig. 11, by way of example, the flow preventing protrusion may be provided in a portion of the outer circumferential surface of the guide casing 8 which is not recessed. Accordingly, when the guide casing 8 is disposed in the preceding basic hole 91, the flow prevention protrusion supports the guide casing 8 with respect to the inner wall of the preceding basic hole 91, 8 can be prevented from flowing in the preceding basic hole 91, such as a diaphragm.

Further, a hook (not shown in the figure) may be formed on the upper end of the guide casing 8. Accordingly, when the guide casing 8 is removed, the rope or the like can be easily connected to the guide casing 8 through the hook, so that the guide casing 8 can be easily removed.

Alternatively, the trailing excavation guide portion may be a sand-filled portion. The preceding basic hole 91 formed with the sand-filled portion may be illustratively shown in Fig. 9 (b).

In the case where the trailing excavation guide portion is a sand-filled portion, when the step S313 is performed, the sand can be introduced into the trailing basic hole 93, and the ground (straight line-shaped trench interior) It may be as shown in FIG. 9 (c).

In the case where the trailing excavation guide portion is a sand-filled portion, step S314 may be to perform air lifting after injecting fluid into a plurality of preceding leading air holes 91 and a plurality of trailing air holes 93 that have been excavated.

Illustratively, when a plurality of trailing basic holes 93 are formed, a fluid is injected into a plurality of preceding leading holes 91 and a plurality of trailing holes 93 after excavation to mix the fluid and the sand filling portion into a slime state , An air lifting pump or an underwater pump to remove the sand filled portion by drawing the sand filled portion together with the fluid.

That is, in the case where the trailing excavation guide portion is the sand-filled portion, in step S300, excavation is performed to form the preceding foundation hole 91 as shown in Fig. 7 (a) 7 (c), excavation is carried out to form the trailing basic hole 93, and as shown in Fig. 7 (d), a sand filling portion is formed in the formed preceding foundation hole 91, , And air lifting can be performed.

Another implementation of step S300 may be as follows.

Referring to FIG. 3, step S300 may include a step (S331) of inserting the excavation part into one of the plurality of holes to perform the ground excavation to form one foundation hole 95 in the ground. The state of the ground on which the step S331 is performed may be exemplarily shown in Fig. 10 (a).

3, the step S300 may include the step S332 of placing the guide casing 8 in one of the base holes 95. As shown in FIG. The state of the ground on which the step S331 and the step S332 are performed may be exemplarily shown in Fig. 10 (b).

3, in step S300, the excavation unit is inserted into a hole adjacent to one of the plurality of holes to perform a ground excavation, thereby forming a foundation hole 95 and an adjacent foundation hole 96 in the ground (S333).

At this time, as shown in Figs. 10 (a) to 10 (d), one basic hole and an adjacent basic hole may partially be overlapped with each other and formed continuously.

The state of the ground in which the steps S331 to S333 are performed may be exemplarily shown in Fig. 10 (c).

3, step S300 may include a step S334 of disposing the guide casing 8 on the adjacent foundation hole 96. In this case, as shown in FIG. The state of the ground in which the steps S331 to S334 are performed may be exemplarily shown in Fig. 10 (d).

Referring to FIG. 3, step S300 may include a step S335 of forming straight line-shaped trenches by repeating steps S331 to S334.

That is, the excavating portion is inserted in each of the plurality of holes in one direction to form the base hole in one direction, and the guide casing 8 can be disposed on the base hole, and then a new basic hole can be formed. The straight-line-shaped trench formed by performing the steps S331 to S335 may be as shown in FIG. 10 (e) by way of example.

According to another embodiment of the above-described step S300, since the guide casings 8 are disposed on the formed base holes and adjacent base holes are formed, it is possible to prevent the gravels formed at the time of forming the adjacent base holes from being introduced into the base holes already formed . Thus, the present underwater trench construction method can be easily performed.

Referring to FIGS. 10 and 12, the guide casing 8 may be formed such that the adjacent outer circumferential surface of the basic air hole is recessed so as to guide the excavation of the adjacent excavation section.

As shown in FIGS. 10 and 12, one of the outer circumferential surfaces of the both sides of the guide casing 8 is formed such that one of the outer circumferential surfaces of the guide casing 8 is curved concavely in an arcuate shape so that the adjacent basic hole 96 is partially overlapped with one of the base holes 95 have.

In addition, the guide casing 8 may be provided with a flow preventing protrusion (not shown in the drawing) along the height direction on the outer circumferential surface thereof so as to prevent the flow in the basic hole. Referring to Fig. 12, by way of example, the flow preventing protrusion may be provided on a portion of the outer circumferential surface of the guide casing 8 which is not recessed. Accordingly, when the guide casing 8 is disposed in the basic hole, the flow prevention protrusion supports the guide casing 8 with respect to the inner wall of the basic hole. By the flow prevention protrusion, And the like can be prevented.

Further, a hook (not shown in the figure) may be formed on the upper end of the guide casing 8. Accordingly, when the guide casing 8 is removed, the rope or the like can be easily connected to the guide casing 8 through the hook, so that the guide casing 8 can be easily removed.

Conventionally, submerged trenches have been constructed using underwater excavation equipment, submersibles, and the like. However, such conventional underwater excavation requires expensive equipments such as an underwater excavator, a submersible vessel, and the like for a small scale underwater excavation having a predetermined depth and width of about 1m to 5m, and an underwater excavator, , It is inefficient and requires a long construction period. Further, there is a problem in that a considerable cost is incurred in equipment manufacturing (rental) expenses, personnel expenses, and the like.

In addition, when the rocks appear early in the shallow depth of the ground during the excavation work, it is necessary to add equipment for crushing the rock in order to crush the rock in a limited space such as underwater, so that additional cost and time are required.

In addition, underwater drilling apparatuses, submersibles, and the like perform work in water. In order to accurately check whether the trenches are formed according to the planned route and scale, it is necessary to periodically communicate with the ground or perform surveying.

However, according to the underwater trench construction method, underwater trench construction can be carried out by using a small-sized excavation equipment such as a guide structure disposed in an aquarium and a PRD excavation equipment commonly used on land, that is, a commercial excavation equipment, The accuracy, efficiency, and economical efficiency of the system can be improved. In addition, since the excavation equipment 910 is disposed on the barge 900 rather than underwater, and excavation is performed using the guide structure 1, work by the diver is unnecessary, and the construction period can be shortened.

Particularly, according to this underwater trench construction method, even if a trench is built in the ground where the rock is early appeared at the depth where the trench is formed at the time of excavation, the small and medium excavation equipment commonly used in excavation of rocks in the ground such as PRD excavation equipment is used , Rock fracture for trench formation can be smoothly performed without any restriction.

The excavation equipment 910 disposed on the barge 900 is precisely guided and excavated through the straight band zone 19 of the guide structure 1 disposed in the aquarium, The position (route) where the trench is installed in the ground in the water is vertically projected to the straight band region 19 of the guide structure 1, so that the trench is accurately installed along the planned path And the confirmation can also be easily made by checking the position of the straight band zone 19 of the guide structure 1 exposed to the water.

That is, this underwater trench construction method can be applied more specifically in the trench construction in the aquifer, particularly in the trench construction in the ground environment where the rocks appear early in a shallow depth of about 1 m to 5 m in which the trench is formed.

In addition, the method of the present invention for piercing large pile files may include the step of removing the guide structure. In the step of removing the guide structure, the guide structure can be removed from the barge 900, illustratively. Alternatively, the barge 900 on which the guide structure is mounted can be removed by moving to the expected construction site of another large-diameter file base. Further, illustratively, the step of removing the guide structure may be performed after step S300. However, the present invention is not limited thereto, and the step of removing the guide structure may be performed at an appropriate time so that the construction by the underwater trench construction method can be easily performed.

Further, the excavation equipment 910 can be disposed on the barge 900 so as to be movable in the direction in which the straight band region of the guide structure 1 is formed. Illustratively, rails (not shown in the figure) can be formed on the barge 900 in a direction parallel to the straight strip zone and the excavation equipment 910 can be moved on the rails, And the excavation can be performed by inserting each hole. The movement of the rails of the excavation equipment 910 can be accomplished through a hydraulic device or the like.

Hereinafter, a guide structure according to an embodiment of the present invention (hereinafter referred to as " guide structure ") will be described. It should be noted, however, that the same reference numerals are used for the same or similar components as those of the foregoing embodiment, and a duplicate description will be simplified or omitted.

Referring to FIGS. 4 and 5, the guide structure 1 includes a guide portion which partially overlaps a plurality of holes and is continuously formed in a row to form a straight strip region 19. As shown in FIG.

Referring to Figure 5, each of the plurality of holes has a size and shape corresponding to the bore of the drilling rig 910.

Each of the plurality of holes may have a size and a shape such that insertion, removal, and excavation of the excavation portion can be easily performed, by inserting the excavation portion of the excavation equipment 910 into each hole.

The minimum width of the overlapping portions of the plurality of holes can correspond to the minimum width of the trench to be constructed.

The minimum width of the overlapping portions of the plurality of holes may be equal to or less than the minimum width of the trench.

In addition, the guide structure may include a separate connecting unit (not shown in the drawings) for mounting to the barge 900 (see Figs. 4 and 5).

It will be understood by those of ordinary skill in the art that the foregoing description of the embodiments is for illustrative purposes and that those skilled in the art can easily modify the invention without departing from the spirit or essential characteristics thereof. 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 entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

1: Guide structure 8: Guide casing
91: Preliminary basic work 93: Trailing basic work
95: one foundation 96: adjacent foundation
900: Barge 910: Excavation equipment
19: straight strip region 931: fastening hole

Claims (11)

As an underwater trench construction method,
(a) disposing a guide structure having a plurality of holes partially overlapping each other on one side of a barge line in correspondence with a trench construction expected point, the guide structure having a guide portion continuously formed in a row to form a straight strip region; And
(b) forming a straight strip-like trench corresponding to the straight strip region by performing a ground excavation by inserting an excavation portion of the excavation equipment into each of the plurality of holes. The method according to claim 1,
The step (b)
(b1) forming a plurality of preceding holes on the ground by performing the excavation of the ground by inserting the excavating portion into every odd-numbered hole among the plurality of holes;
(b2) forming a trailing excavation guide portion for each of the plurality of preceding traverse holes;
(b3) forming a plurality of trailing basic holes in the ground by performing the excavation of the ground by inserting the excavating portion into every even-numbered hole among the plurality of holes; And
(b4) removing the trailing excavation guide after forming the plurality of trailing holes,
Wherein the preliminary foundation hole and the trailing foundation hole are partially overlapped and formed continuously to form the straight strip-like trench. 3. The method of claim 2,
Wherein the trailing excavation guide portion is a guide casing,
Wherein the outer circumferential surfaces on both sides of the guide casing are concave and recessed to guide excavation of the trailing basic air of the excavating portion. 3. The method of claim 2,
In the step (b2)
Wherein the trailing excavation guide portion is a sand filled portion,
The step (b4)
Wherein the plurality of preceding holes and the plurality of trailing holes are filled with fluid and then air lifted. The method according to claim 1,
The step (b)
(b1) inserting the excavation part into one of the plurality of holes to perform ground excavation to form a single ground hole in the ground;
(b2) disposing a guide casing on the one basic hole;
(b3) inserting the excavating section into a hole adjacent to the one hole among the plurality of holes to perform ground excavation to form a ground hole adjacent to the one ground hole on the ground;
(b4) disposing a guide casing on the adjacent initial hole;
(b5) repeating the steps (b1) to (b4) to form the straight stripe-shaped trench; And
(b6) removing the guide casing inserted into the trench after forming the straight strip-shaped trench,
Wherein the one basic hole and the one basic hole and the adjacent basic hole partially overlap each other and are formed continuously. 6. The method of claim 5,
Wherein the guide casing is recessed and formed with the adjacent outer circumferential surface adjacent to the outer circumferential surface so as to guide the excavation of the adjacent excavator. The method according to claim 1,
The step (a)
(a1) selectively fastening the guide structure to at least two of a plurality of fastening holes spaced along the first horizontal direction in parallel with the linear band zone on the barge line, and arranging the guide structure on one side of the barge line; And
(a2) selectively positioning the guide structure disposed at one side of the barge line along a direction approaching or departing from the barge line. 8. The method of claim 7,
Wherein at least one of the step (a1) and the step (a2) is repeated until a positional error between a position of the guide structure and a trench construction expected point is reduced to within a predetermined tolerance. 8. The method of claim 7,
Wherein the direction in which the barge is brought closer to or away from the barge is a second horizontal direction orthogonal to the first horizontal direction. 8. The method of claim 7,
In the step (a2)
Wherein the adjustment of the position of the guide structure along the direction approaching the barge line and the direction away from the barge is performed by a linear drive unit. 9. The method of claim 8,
Wherein the linear drive unit is a hydraulic cylinder.

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