KR102557752B1 - Pre-drilling and positioning method for installation of jacket foundation - Google Patents

Abstract

The present invention relates to a pre-drilling installation method for a jacket foundation structure and a jacket foundation structure using the same. To this end, in the jacket foundation structure installed at a specific installation location on the seabed, before the penetration portion is inserted, a plurality of perforations are pre-drilled to correspond to the penetration portion at the installation location; The penetration portion is inserted into the perforation portion to provide that the jacket portion is mounted at the installation location.

Description

Pre-drilling and positioning method for installation of jacket foundation

The present invention relates to a pre-drilling installation method for a jacket foundation structure and a jacket foundation structure using the same.

In general, offshore structures refer to various structures that can be installed on the sea with foundations fixed to the seabed. Representative examples include offshore wind power generators, oil and gas production structures such as offshore oil drilling platforms, marine science base structures, and harbor structures. Such an offshore structure is seated and fixed on a foundation structure fixed to the seabed, and the foundation structure is usually fixed to the seabed to form a foundation structure and a deck for installing an upper structure on top of the foundation structure. An upper structure is installed on the deck. 1 is a schematic diagram showing an example of a basic structure of offshore wind power generation. As shown in FIG. 1, the foundation structure is classified into a monopile type, a tripod type, a dolphin type, a jacket type, a floating structure, and the like according to its shape. Among them, the jacket type has a relatively stable structure against the wave force acting horizontally on the foundation structure, requires minimal ground clearance, and can be constructed with small-diameter piles, so it corresponds to a highly preferred type.

Regarding the jacketed foundation structure, FIG. 2 is a schematic diagram showing the jacketed foundation structure. As shown in FIG. 2, the foundation structure to which a general jacket-type foundation structure is applied is a type in which legs made of steel pipes are erected on the sea floor, brace members are installed between legs to form a three-dimensional truss structure, and piles are additionally installed to fix the legs to the sea floor. A jacketed foundation structure is generally composed of four legs and a plurality of braces connecting between the legs, and these legs may be configured to be supported on the ground by piles.

The construction of a general jacket type foundation structure proceeds in the following steps: ground preparation at the installation location, transportation of the jacket foundation structure using a barge, etc., installation of the jacket at the intended location, pile driving, welding and grouting of the jacket-pile connection.

Republic of Korea Patent Publication No. 10-2015-0077787, Offshore wind power jacket basic structure construction method using buoyancy tank, POSCO E&C Republic of Korea Patent Publication No. 10-2015-0077748, construction method of jacket foundation structure with vertical legs formed, POSCO E&C Co., Ltd.

In general, since there is a layer of soil on the seabed, it is possible to secure stability against external forces to a level that allows subsequent work by immediately installing piles after passing through the jacket. However, under conditions where bedrock is exposed on the seabed or soil layer of sufficient thickness does not exist (typically in Korea, conditions such as the coastal area of Jeju Island), piles cannot be installed immediately after the jacket is mounted, and work such as bedrock excavation must be performed. Therefore, the period until the installation of the pile is completed increases, and there is a problem that the jacket foundation structure is overturned by external force (wave force, tidal force, wind load, etc.) or the risk of activity increases. Existing methods to secure stability during the temporary standing period of the jacket foundation structure before the pile installation is completed include installing a separate fixing jig or pouring cast-off concrete on the floor.

Specifically, FIG. 3 is a schematic diagram showing a construction method using a jig for fixing a jacket among existing temporary mounting methods. As shown in FIG. 3 , the existing temporary mounting method has a problem in that time and construction costs increase due to the addition of the process of installing and removing the jig for fixing the jacket. In addition, FIG. 4 is a schematic diagram showing a method of dredging a sedimentary layer and pouring abandoned concrete among existing temporary mounting methods. As shown in FIG. 4, when applying the existing method, pouring concrete is required to the lower end of the leg can of the jacket foundation structure to fix the pile, but since the EL (Elevation Level) of the seabed ground is irregular, different construction is required for each jacket unit. There was a problem that the workability was somewhat lowered.

Therefore, an object of the present invention is to reduce the construction difficulty for minimizing installation position construction errors, to eliminate additional jig installation/removal processes in the case of seabed rock layers, and to provide a pre-drilled installation method for jacket foundation structures in which workability constraints according to EL are resolved, and a jacket foundation structure using the same.

Hereinafter, specific means for achieving the object of the present invention will be described.

An object of the present invention is to provide a jacket foundation structure installed at a specific installation location on the seabed, comprising: a jacket portion including braces and legs as a main body of the jacket foundation structure; a penetrating portion disposed at a lower portion of the leg and extending in a longitudinal direction downward of the jacket portion; And before the penetration portion is inserted, a plurality of perforations are pre-drilled to correspond to the penetration portion at the installation position, wherein the penetration portion is inserted into the perforation portion and the jacket portion is mounted at the installation position.

Alternatively, the seafloor ground may be characterized in that it means a bedrock layer.

Alternatively, a first grouting part, which is a grout installed in a space between the inside of the perforation part and the penetration part, may be further included, and the first grouting part may be constructed after the penetration part is inserted into the perforation part and temporarily held.

Alternatively, a first grouting part that is a grout applied to the space between the inside of the perforation part and the intrusion part; A pin file that penetrates the penetration portion and is poured on the bottom surface of the perforation portion; and a second grouting part including grout applied to the inner space of the fin pile, grout applied to the space between the outside of the fin pile and the seafloor ground, or grout applied to the space between the outside of the fin pile and the inside of the penetrating part, wherein the first grouting part is constructed after the penetrating part is inserted into the perforation and temporarily held, the fin pile is constructed after the first grouting part is constructed, and the fin pile is constructed after the fin pile is constructed. It may be characterized in that the second grouting part is constructed.

Alternatively, a reinforcing material configured to surround the penetration portion outside the penetration portion and composed of reinforcing bar reinforcement or reinforcing bar line casting reinforcement composed of spiral strip reinforcement and column main bars; and a first grouting part, which is a grout applied to a space between an inside of the perforation part and the penetration part, wherein the first grouting part is constructed after the penetration part is inserted into the perforation part and temporarily held, and the penetration part, the reinforcing material, and the perforation part are integrated.

Alternatively, the penetration part is first partially inserted into the perforation constructed at the highest elevation level (EL) of the seabed ground among the installation positions, and the jacket part is rotated in the transverse direction to the perforation. After the position is adjusted to match the perforation part in the vertical direction, the penetration part is inserted into the perforation part, and the jacket part is installed at the installation position.

In addition, the flange portion configured to protrude in the vertical direction of the penetration portion on the outside, inside or bottom of the penetration portion; and an elevating module having an upper side vertically fastened to the flange portion, a lower side configured to support the lower ground of the perforation portion, and configured to extend or contract in length in the longitudinal direction of the penetration portion. The elevational position of the penetration portion relative to the lower ground of the perforation portion is adjusted by extension or contraction of the elevating module, and the flange portion and the elevating module are configured such that an internal space of the penetration portion is opened in a longitudinal direction.

In addition, the perforation part is over-drilled to a depth greater than the length of the penetration part, and further includes a detailed adjustment part in which backfilling or abandoned concrete is poured into the ground below the perforation part.

Another object of the present invention is to provide a jacket foundation structure installed at a specific installation location on the seabed, as a main body of the jacket foundation structure, comprising: a jacket portion including braces and legs; and a penetrating part formed at the lower part of the leg and having a longitudinal direction below the jacket part; and including, wherein the penetrating part is inserted into a plurality of pre-drilled perforated parts to correspond to the penetrating part at the installation position before the penetrating part is inserted, and the jacket part is mounted at the installation position.

Another object of the present invention is a main body of a jacket foundation structure installed at a specific installation location on the seabed ground, comprising: a jacket portion including braces and legs; and a penetrating portion formed at a lower portion of the leg and having a lengthwise direction lower than the jacket portion, wherein a plurality of pre-drilling is performed to correspond to the penetrating portion at the installation location to create a perforated portion; It can be achieved by providing a pre-drilled mounting construction method for a jacket foundation structure, including; and a temporary mounting step of inserting the penetration part into the perforation part and mounting the jacket part at the installation position.

Alternatively, the seafloor ground may be characterized in that it means a bedrock layer.

Alternatively, the method may further include a first grouting step of constructing a first grouting part in a space between the inside of the perforation part and the intrusion part after the temporary mounting step.

Alternatively, after the temporary mounting step, a first grouting step of constructing a first grouting part in the space between the inside of the perforation part and the intrusion part; A pile construction step of pouring a pin pile through the penetration part to the bottom surface of the perforation part; and a second grouting step of constructing a second grouting part in a space inside the fin pile, a space between the outside of the fin pile and the seafloor ground, or a space between the outside of the fin pile and the inside of the penetration part.

Alternatively, prior to the temporary installation step, a reinforcing step of configuring a reinforcing material composed of reinforcing bars composed of spiral strip reinforcing bars and column main bars or reinforcing bar line casting reinforcement to surround the intrusion portion outside the intrusion portion; and a first grouting step of constructing a first grouting part in a space between the inside of the perforation part and the penetration part after the temporary mounting step, wherein the first grouting part integrates the penetration part, the reinforcing material, and the perforation part.

Alternatively, the temporary mounting step may include first partially inserting the penetration part into the perforation constructed at the highest elevation level (EL) of the seafloor ground among the installation positions, rotating the jacket part in the horizontal direction, adjusting the position of the penetration part to match the perforation part in the vertical direction, and then inserting the penetration part into the perforation part to mount the jacket part at the installation position.

Alternatively, the jacket base structure may include a flange portion protruding in a vertical direction of the penetration portion at an outer side, an inside side, or a lower end of the penetration portion; and an elevating module, the upper side of which is vertically fastened to the flange portion, the lower side of which is configured to support the lower ground of the perforation portion, and the elevating module configured to extend or contract in the longitudinal direction of the penetration portion, wherein the flange portion and the elevating module are configured to open the internal space of the penetration portion in the longitudinal direction, and after the temporary mounting step, the elevating module is extended or contracted to adjust the vertical position of the penetration portion with respect to the lower ground of the perforation portion. It may be characterized in that it further comprises; verticality fine-adjustment step of fine-tuning the verticality.

In addition, the perforation part of the jacket foundation structure is over-drilled to a depth greater than the length of the penetration part, and further includes a detailed adjustment part in which backfilling or discarded concrete is poured into the ground below the perforation part. After the pre-piercing step, a detailed adjustment step of leveling or adjusting the verticality of the penetration part through the construction of the detailed adjustment part in the ground below the perforation part; may be characterized in that it further comprises.

As described above, the present invention has the following effects.

First, according to one embodiment of the present invention, since the position of the penetration part of the jacket base structure is adjusted after penetration into the perforation part, the effect of reducing the construction difficulty for minimizing the installation position construction error occurs.

Second, according to one embodiment of the present invention, when constructing the jacket foundation on the seabed rock layer, an additional jig installation/removal process is excluded.

Thirdly, according to one embodiment of the present invention, the effect of dissolving the constructability constraints according to the EL (Elevation Level) of the seabed ground is generated. When applying the existing method to the seabed rock layer, it is necessary to pour cast concrete to fix the pile, but there is a problem that the workability is somewhat lowered because the EL of the seabed ground is irregular. According to one embodiment of the present invention, since the grout of the perforation part fixes the pile, additional fixing work is unnecessary, and thus, the effect of solving the workability restriction according to the EL of the seabed ground occurs.

Fourth, according to one embodiment of the present invention, when the jacket is temporarily mounted after the pre-drilling of the seabed bedrock layer, the stability of the jacket base structure during construction can be ensured, and the structure can be mounted at the correct position.

Fifth, according to one embodiment of the present invention, since the outside of the leg of the jacket foundation structure is pre-grouted with the surrounding bedrock, an effect of preventing outflow of grouting around the pile is generated. 5 is a schematic diagram showing a sealing operation between the bottom of a leg and a bedrock according to a conventional general method. As shown in FIG. 5, according to the existing general method, in order to prevent the leakage of grout between the bottom of the leg of the jacket foundation structure and the bedrock, rubber pad (Fig. 5a), hemispherical rubber (Fig. 5b), rubber packing (Fig. 5c), and grout leakage minimization work (Fig.

Sixth, according to one embodiment of the present invention, the stability of the jacket foundation structure can be secured even in the stage before pile construction, and the jacket foundation structure can be mounted and fixed in an accurate position through the minimum drilling of the rock layer, and the drilling operation is performed in the manufacturing or transportation stage of the jacket foundation structure, so that the construction can be performed so as not to affect the air.

On the other hand, the effects obtainable in the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description below.

The following drawings attached to this specification illustrate preferred embodiments of the present invention, and together with the detailed description of the invention serve to further understand the technical idea of the present invention, the present invention is limited to those described in the drawings. It should not be construed.
1 is a schematic diagram showing an example of a basic structure of offshore wind power generation;
2 is a schematic diagram showing a jacket basic structure;
3 is a schematic diagram showing a construction method using a jig for fixing a jacket among existing temporary mounting methods;
4 is a schematic diagram showing a sedimentary dredging and discarded concrete pouring method among existing temporary mounting methods;
Figure 5 is a schematic diagram showing the sealing operation between the lower leg and the bedrock according to the existing general method;
6 is a flow chart showing a pre-drilling installation method for a jacket foundation structure according to an embodiment of the present invention;
7 is a schematic diagram showing a pre-piercing step (S10) according to an embodiment of the present invention;
8 is a schematic diagram showing the construction of the detailed adjustment part (backfill construction or abandoned concrete pouring construction) of the pre-drilling step (S10) according to an embodiment of the present invention;
9 and 10 are schematic diagrams showing the temporary mounting step (S20) according to an embodiment of the present invention;
11 is a schematic diagram showing the configuration of an outer flange and an elevating module according to a first modified example of the present invention;
Figure 12 is a schematic diagram of the configuration of the lower or inner flange and the lifting module according to the second modified example of the present invention
13 is a schematic diagram showing a perforation grouting step (S30) according to an embodiment of the present invention;
14 is a schematic diagram showing a pile construction step (S40) according to an embodiment of the present invention;
15 shows a pile grouting step (S50) according to an embodiment of the present invention;
16 illustrates a reinforcement step according to an embodiment of the present invention.

Hereinafter, an embodiment in which a person skilled in the art can easily practice the present invention will be described in detail with reference to the accompanying drawings. However, in the detailed description of the operating principle of the preferred embodiment of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted.

In addition, the same reference numerals are used for parts having similar functions and actions throughout the drawings. Throughout the specification, when a specific part is said to be connected to another part, this includes not only the case where it is directly connected but also the case where it is indirectly connected with another element interposed therebetween. In addition, including a specific component does not exclude other components unless otherwise stated, but means that other components may be further included.

Pre-drilled installation method for jacket foundation structure

6 is a flow chart showing a method for installing pre-drilling of a jacket foundation structure according to an embodiment of the present invention. As shown in FIG. 6, the pre-drilling installation method for the jacket base structure according to an embodiment of the present invention may include a pre-drilling step (S10), a temporary mounting step (S20), a jacket penetration grouting step (S30), a pile construction step (S40), and a pile grouting step (S50).

The pre-drilling step (S10) is a step of pre-drilling the installation position of the jacket base structure 10 to create the perforated part 1. 7 is a schematic diagram showing a pre-piercing step (S10) according to an embodiment of the present invention. As shown in FIG. 7 , the perforation part 1 may be created by performing pre-drilling with a diameter wider than the diameter of the penetration part 13 at the installation position of each penetration part 13 of the jacket base structure 10 . For example, the diameter w of the perforation part 1 may be 1.1 to 2 times the diameter of the penetration part 13, and the depth h of the perforation part 1 may be deeper than the length of the penetration part 13. At this time, it is also possible that the depth (h) of the perforation (1) is configured to be shallower than the length of the penetration part (13) according to the construction environment or construction conditions. The pre-perforated construction of the perforation part 1 according to an embodiment of the present invention has the effect of greatly increasing the stability during jacket mounting. In particular, the effect of securing sufficient stability when mounting the jacket is generated only by the pre-drilling construction of the shallow perforation part 1 having a depth below a certain level compared to the height of the structure. At this time, when the diameter (w) of the perforation part (1) is excessively wide, the bonding force between the jacket leg and the grout is lowered, resulting in a decrease in stability, and when the depth (h) of the perforation part (1) is too deep, a problem in that the air for rock excavation becomes long occurs.

Regarding the depth (h) of the perforation part (1), when the pre-drilling part (1) is constructed deeper than the length of the penetration part (13) (over-drilling), it can be configured to perform leveling (level fine adjustment) or verticality fine adjustment of the jacket structure by constructing a detailed adjustment part including backfilling or discarding concrete pouring in the lower ground. 8 is a schematic diagram showing the construction of the detailed adjustment part (backfill construction or abandoned concrete pouring construction) of the pre-drilling step (S10) according to an embodiment of the present invention. As shown in FIG. 8, during the pre-drilling construction of the perforation part 1, after the construction (over-drilling, H1, H2, EL(-)d) deeper than the length of the penetration part 13, the lower ground is backfilled or discarded. It can be configured to perform leveling (level fine adjustment) or verticality fine adjustment of the jacket structure by constructing the detailed adjustment unit 100 including concrete pouring construction, etc. According to this, since it is possible to fine-tune the depth of the perforation part 1 at low cost after pre-drilling, cost, time, and construction difficulty compared to the method of elaborately constructing the depth h of the perforation part 1 only by excavation There is an effect of generating a relative benefit in terms of difficulty.

In addition, the depth h of the perforation part 1 constructed at the installation position where the EL is the highest among the perforation part 1 may be configured to be the deepest. Even if the EL (Elevation Level) of the seafloor ground is different from EL (-)a and EL (-)b at the installation location corresponding to each penetration part 13, the bottom surface water depth (EL (-)c) of the perforation part 1 is the same. The construction position of the perforation unit 1 may be configured to perforate an accurate position using equipment such as GPS so that an error of more than a certain level does not occur in the installation position of the jacket basic structure 10. In the existing general construction method, there was a problem in that the jacket foundation structure 10 should be accurately placed on the installation position when mounting the jacket foundation structure 10 on the sea floor, so there was a difficulty in construction.

The temporary mounting step (S20) is a step of inserting each penetration part 13 of the jacket basic structure 10 into the perforation part 1 and temporarily placing it thereon. 9 and 10 are schematic diagrams showing the temporary mounting step (S20) according to an embodiment of the present invention. As shown in FIGS. 9 and 10 , in the temporary mounting step (S20) according to an embodiment of the present invention, each inlet portion 13 of the jacket base structure 10 is inserted into the perforated portion 1 to be temporarily installed. FIG. 9 shows a case where the intrusion part is formed extending from the leg of the jacket foundation structure, and FIG. 10 shows a case where the penetration part is formed in the form of a pile sleeve on the side of the leg of the jacket foundation structure. As shown in FIGS. 9 and 10, the scope of the present invention may include a construction method for a jacket base structure having various intrusion shapes, but for convenience of description, the following intrusion portion 13 is extended from the end of the leg 12. It has been described based on the form. In the existing general construction method, there was a problem in that the jacket foundation structure must be accurately placed on the installation position when mounting the jacket foundation structure on the sea floor, so there was difficulty in construction. A setting barge, such as a crane barge for temporary support of the jacket foundation structure 10, may be utilized.

In particular, in the temporary mounting step (S20) according to an embodiment of the present invention, a specific penetration part 13 of the jacket basic structure 10 is first partially inserted into the perforation part 1 at the installation position where the elevation level (EL) of the seabed ground is highest, and the jacket basic structure 10 is rotated in the transverse direction around the inserted specific penetration part 13 to adjust the position of each penetration part 13 to each perforation part 1 in the vertical direction. After that, it may be configured to insert each penetration part 13 into each perforation part 1. According to this, when the jacket base structure 10 is mounted on the sea floor, the difficulty of mounting the jacket base structure 10 at the correct installation position is greatly reduced.

In addition, in relation to the modified example of the present invention for fine adjustment of the verticality when the jacket foundation structure 10 is temporarily mounted, FIG. 11 is a schematic diagram in which the outer flange and the elevating module are configured according to the first modified example of the present invention, and FIG. 12 is a schematic diagram showing the lower or inner flange and the lifting module configured according to the second modified example of the present invention. As shown in FIGS. 11 and 12, according to the configuration of the penetration part 13 according to the modified example of the present invention, the flange part 130 and the elevating module 131 can be configured at the lower end of each penetration part 13. The flange portion 130 may be configured to protrude from the outside, inside, or bottom of the penetration portion 13 in the vertical direction of the penetration portion to support the upper side of the elevating module 131 . The elevating module 131 is vertically fastened to the flange portion 130 so that the upper side supports the penetration portion 13 through the flange portion 130, and the lower side is configured to support the lower ground of the perforation portion 1. The length of the penetration portion 13 may be extended or contracted in the longitudinal direction to adjust the vertical position of the penetration portion 13 with respect to the lower ground of the perforation portion 13. In addition, the flange portion 130 and the elevating module 131 may be configured such that the internal space of the penetrating portion 13 is opened in the longitudinal direction so that the pin file 30 is inserted into the penetrating portion 13 and penetrates in the longitudinal direction. At this time, the lifting module 131 may be composed of lifting means such as a hydraulic jack, a pneumatic jack, a mechanical jack, and a bolt. According to the flange portion 130 and the elevating module 131 according to the modified example of the present invention, when more fine verticality adjustment is required, or in the case of terrain where verticality adjustment is difficult due to backfilling, etc., the jacket base structure 10 After temporary installation, precise verticality adjustment is possible. According to this, since the precision of the process for the depth (h) is not required during the pre-drilling construction of the perforation part (1), the process difficulty is reduced and the period is shortened.

Grouting the perforation part ( S30 ) is a step of creating the first grouting part 20 by grouting between the inside of the perforation part 1 and the penetration part 13 to temporarily fix the jacket base structure 10 . 13 is a schematic diagram showing a perforation grouting step (S30) according to an embodiment of the present invention. As shown in FIG. 13, according to the grouting step (S30) of the perforation part according to an embodiment of the present invention, the first grouting part 20 may be created by grouting between the perforation part 1 and the penetration part 13 to temporarily fix the jacket base structure 10. According to this, since the outside of the penetration part 13 of the jacket base structure 10 is pre-grouted with the surrounding bedrock, the effect of preventing the outflow of grout around the piles without additional work in the pile grouting step (S50) is generated.

In the pile construction step (S40), the inlet of the pin pile 30 is excavated, the pin pile 30 is inserted through the penetration part 13 or the leg 12 of the jacket foundation structure 10, and the pin pile 30 is driven using a hammer. When the penetration part 13 of the jacket base structure 10 is configured on the side of the leg 12 in the form of a pile sleeve, the pin pile 30 is inserted through the penetration part 13, and when the penetration part 13 of the jacket base structure 10 is configured to extend from the leg 12, the pin pile 30 may be inserted through the leg 12 and the penetration part 13. 14 is a schematic diagram showing a pile construction step (S40) according to an embodiment of the present invention. As shown in FIG. 14, according to the pile construction step (S40) according to an embodiment of the present invention, the fin pile 30 can be poured immediately without any additional process such as jig installation after the temporary mounting of the jacket foundation structure. The effect of shortening the air is generated.

The pile grouting step (S50) is a step of generating the second grouting portion 21 by grouting the inside of the pin pile 30 constructed in the pile construction step (S40), the space between the pin pile 30 and the seabed ground (mainly rock mass), and the space between the pin pile 30 and the penetration part 13 of the jacket foundation structure 10. 15 illustrates a file grouting step (S50) according to an embodiment of the present invention. As shown in FIG. 15, the pile grouting step (S50) is the inside of the pin pile 30, the space between the pin pile 30 and the seabed ground (mainly rock mass), and the pin pile 30 and the jacket foundation structure. It may be configured to grout the space between the penetration part 13 of 10.

Additionally, the method for mounting the pre-drilled jacket base structure according to an embodiment of the present invention may further include a reinforcement step when manufacturing the jacket base structure 10 . The reinforcing step is a step of reinforcing reinforcing materials 40 such as pre-assembled reinforcing bars to the outside of the penetration part 13 of the jacket basic structure 10. 16 illustrates a reinforcement step according to an embodiment of the present invention. As shown in FIG. 16, according to the reinforcing step according to an embodiment of the present invention, since the reinforcing material 40 such as pre-assembled reinforcing bars is configured in the space between the penetration part 13 and the perforation part 1 of the jacket basic structure 10, even when the area of the perforation part is wide, the effect of securing stability by improving resistance to pulling out during grout occurs. The reinforcing material 40 according to an embodiment of the present invention may be composed of reinforcing bars composed of spiral strip reinforcing bars and column main bars or reinforcing bars/line casting reinforcement.

Jacket foundation structure using pre-drilled mounting

As shown in FIG. 16, the jacket basic structure 10 using pre-drilling mounting according to an embodiment of the present invention includes a perforation part 1, a jacket part, a penetration part 13, a pin pile 30, and a first grouting part 20 and a second grouting part 21. For convenience of description, descriptions of components such as a transition piece, a work platform, and a boat landing included in the jacket basic structure are omitted, but the scope of the present invention is not limited.

The drilling part 1 means an excavation part configured by performing pre-drilling with a diameter wider than the diameter of the penetrating part 13 at the installation position of each penetrating part 13 of the jacket basic structure 10. For example, the diameter w of the perforation part 1 may be 1.1 to 2 times the diameter of the penetration part 13, and the depth h of the perforation part 1 may be deeper than the length of the penetration part 13. At this time, it is also possible that the depth (h) of the perforation (1) is configured to be shallower than the length of the penetration part (13) according to the construction environment or construction conditions.

Regarding the depth (h) of the perforation part (1), when the pre-drilling part (1) is constructed deeper than the length of the penetration part (13) (over-drilling, H1, H2, EL(-)d), it is possible to perform leveling (level fine adjustment) or verticality adjustment of the jacket structure by constructing the detailed adjustment part 100 including backfilling or abandonment concrete pouring in the lower ground to the planned height (h1, h2, EL(-)c). .

In addition, the depth h of the perforation part 1 constructed at the installation position where the EL is the highest among the perforation part 1 may be configured to be the deepest. In addition, even if the EL (Elevation Level) of the seafloor ground is different from EL (-)a and EL (-)b at the installation location corresponding to each penetration part 13, the bottom surface water depth (EL (-)c) of the perforation part 1 The depths h1 and h2 of each perforation part 1 can be constructed differently.

The jacket portion refers to the main body of the jacket basic structure 10 composed of braces 11 and legs 12 . A transition piece, a work platform, a boat landing, and the like may be configured in the jacket portion, and an offshore structure may be installed on the upper portion of the jacket portion.

The penetrating part 13 is formed in the lower part of the leg of the jacket base structure 10, and the longitudinal direction is formed in the lower part of the jacket part and penetrates into the perforated part 1.

The pin pile 30 means a pile that is poured through the penetration part 13 of the jacket base structure 10. Excavate the inlet part of the pin pile 30, insert the pin pile 30 through the leg or penetration part 13 of the jacket base structure 10, and drive the pin pile 30 to the bottom surface of the perforation part 1. It can be configured by pouring the pin pile 30. When the penetration part 13 of the jacket base structure 10 is configured on the side of the leg 12 in the form of a pile sleeve, the pin pile 30 is inserted through the penetration part 13, and when the penetration part 13 of the jacket base structure 10 is configured to extend from the leg 12, the pin pile 30 may be inserted through the leg 12 and the penetration part 13.

The first grouting part 20 may refer to grout applied to a space between the inside of the perforation part 1 and the penetration part 13 . According to the first grouting part 20, the penetration part 13 and the perforation part 1 can be integrated, and furthermore, the reinforcing material 40 can also be integrated together.

The second grouting part 21 may mean grout applied to the inner space of the pin pile 30, grout applied to the space between the outside of the pin pile 30 and the seabed ground (rock), and grout applied to the space between the outside of the pin pile 30 and the inside of the penetration part 13 of the jacket foundation structure 10.

Additionally, the jacket base structure 10 using the pre-drilling installation according to an embodiment of the present invention may further include a reinforcing material 40 outside the penetration part 13 . The reinforcing material 40 according to an embodiment of the present invention may be composed of reinforcing bars composed of spiral strip reinforcing bars and column main bars or reinforcing bars/line casting reinforcement. According to one embodiment of the present invention, since the reinforcing material 40, such as pre-assembled reinforcing bars, is configured in the space between the penetration part 13 and the perforation part 1 of the jacket basic structure 10, even when the area of the perforation part is wide, resistance to pulling out during grout is improved to ensure stability.

As described above, those skilled in the art to which the present invention pertains will be able to understand that the present invention can be embodied in other specific forms without changing its technical spirit or essential features. Therefore, the above-described embodiments should be understood as illustrative in all respects and not restrictive. The scope of the present invention is indicated by the claims to be described later rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and equivalent concepts should be construed as being included in the scope of the present invention.

1: perforation
10: jacket substructure
11: Brace
12: leg
13: penetration
20: first grouting part
21: second grouting part
30: pin file
40: stiffener
100: detailed adjustment unit
130: flange part
131: lifting module

Claims (17)

In the jacket foundation structure installed at a specific installation location on the seabed ground,
As a main body of the jacket basic structure, the jacket portion including braces and legs;
a penetrating portion disposed at a lower portion of the leg and extending in a longitudinal direction downward of the jacket portion; and
Before the inlet is inserted, a plurality of pre-drilled constructions to correspond to the inlet at the installation location, and a perforation having a diameter 1.1 to 2 times the diameter of the inlet;
a first grouting part, which is a grout applied to the space between the inside of the perforation part and the penetration part;
A pin file that penetrates the penetration portion and is poured on the bottom surface of the perforation portion; and
A second grouting unit including grout applied to the inner space of the fin pile, grout applied to the space between the outside of the fin pile and the seabed ground, and grout applied to the space between the outside of the fin pile and the inside of the penetration part;
including,
The first grouting part is constructed after the penetrating part is inserted into the perforation part and temporarily held,
The fin pile is constructed after the first grouting part is constructed, and the second grouting part is constructed after the pin pile is constructed,
The penetration part is inserted into the perforation part and the jacket part is installed at the installation position, but the penetration part is first partially inserted into the perforation part constructed at the highest elevation level (EL) of the seafloor ground among the installation positions, and the jacket part is rotated in the transverse direction around the inserted penetration part to adjust the position of the penetration part to the perforation part in the vertical direction. Characterized in that the depth of the perforation constructed at the highest position is the deepest,
Jacket foundation structure using pre-drilled mounting.
According to claim 1,
Characterized in that the seabed ground means a bedrock layer,
Jacket foundation structure using pre-drilled mounting.
According to claim 1,
The pin pile passing through the penetration part and being poured on the bottom surface of the perforation part,
When the penetration part is formed on the side of the leg in the form of a pile sleeve, it penetrates the penetration part and is poured into the bottom surface of the perforation part,
When the penetration part is configured to extend from the leg, the leg and the penetration part are poured into the bottom surface of the perforation part.
Jacket foundation structure using pre-drilled mounting.
delete According to claim 1,
A reinforcing material configured to surround the penetration portion outside the penetration portion and composed of reinforcing bar consisting of spiral strip reinforcing bars and column main bars or reinforcing bar line casting reinforcement
Including more,
The first grouting part is constructed after the penetration part is inserted into the perforation part and temporarily held, and the penetration part, the reinforcing material, and the perforation part are integrated.
Jacket foundation structure using pre-drilled mounting.
delete According to claim 1,
A flange portion configured to protrude in a vertical direction of the inlet portion on the outside, inside, or bottom of the inlet portion; and
an elevating module having an upper side vertically fastened to the flange unit, a lower side supporting the lower ground of the perforation unit, and extending or contracting in length in the longitudinal direction of the penetration unit;
Including more,
The vertical position of the penetration part with respect to the lower ground of the perforation part is adjusted by extension or contraction of the elevating module,
Characterized in that the flange portion and the elevating module are configured such that the internal space of the intrusion portion is opened in the longitudinal direction.
Jacket foundation structure using pre-drilled mounting.
According to claim 1,
The perforation is over-perforated at a depth greater than the length of the penetration,
A detailed adjustment unit for backfilling or discarding concrete pouring in the lower ground of the perforation unit;
Including more,
Characterized in that the leveling or verticality adjustment of the penetration part is performed through the construction of the detailed adjustment part.
Jacket foundation structure using pre-drilled mounting.
delete A main body of a jacket foundation structure installed at a specific installation location on the seabed ground, comprising: a jacket portion including braces and legs; In the construction method of the jacket foundation structure including;
Before the inlet is inserted, a pre-drilling step of constructing a plurality of pre-drilled holes corresponding to the inlet at the installation location to create a perforation having a diameter 1.1 to 2 times the diameter of the inlet;
a temporary mounting step of inserting the penetration part into the perforation part and placing the jacket part at the installation position;
a first grouting step of constructing a first grouting part in a space between an inner side of the perforation part and the penetration part;
A pile construction step of pouring a pin pile through the penetration part to the bottom surface of the perforation part; and
a second grouting step of constructing a second grouting part in a space inside the fin pile, a space between the outside of the fin pile and the seafloor ground, and a space between the outside of the fin pile and the inside of the penetration part;
Including,
In the temporary mounting step, the penetration part is first partially inserted into the perforation constructed at the highest elevation level (EL) of the seafloor ground among the installation positions, and the jacket part is rotated in the transverse direction around the inserted penetration, so that the position of the penetration part is aligned with the perforation in the vertical direction. characterized in that it consists of
Pre-drilled installation method of jacket foundation structure.
According to claim 10,
Characterized in that the seabed ground means a bedrock layer,
Pre-drilled installation method of jacket foundation structure.
According to claim 10,
In the pile construction step, the pin pile,
When the penetration part is formed on the side of the leg in the form of a pile sleeve, it penetrates the penetration part and is poured into the bottom surface of the perforation part,
When the penetration part is configured to extend from the leg, the leg and the penetration part are poured into the bottom surface of the perforation part.
Pre-drilled installation method of jacket foundation structure.
delete According to claim 10,
Prior to the temporary mounting step,
A reinforcing step of configuring a reinforcing material composed of reinforcing bars composed of spiral strip reinforcing bars and column main bars or reinforcing bar line cast reinforcement to surround the intrusion portion outside the intrusion portion;
Including more,
The first grouting part is characterized in that the penetration part, the reinforcing material and the perforation part are integrated.
Pre-drilled installation method of jacket foundation structure.
delete According to claim 10,
The jacket base structure includes a flange portion protruding in the vertical direction of the penetration portion at the outer, inner side, or lower end of the penetration portion; And an elevating module having an upper side vertically fastened to the flange portion, a lower side configured to support the lower ground of the perforated portion, and configured to extend or contract in length in the longitudinal direction of the penetration portion, wherein the flange portion and the elevating module are configured such that the internal space of the penetration portion is opened in the longitudinal direction,
After the temporary mounting step,
a verticality fine-adjustment step of finely adjusting the verticality of the jacket foundation structure by performing an extension or contraction of the elevating and descending module to adjust the vertical position of the penetration part with respect to the lower ground of the perforation part;
Characterized in that it further comprises,
Pre-drilled installation method of jacket foundation structure.
According to claim 10,
The perforation of the jacket foundation structure further includes a detailed adjustment unit in which the perforation is over-perforated to a depth greater than the length of the penetration, and the ground under the perforation is backfilled or abandoned concrete is poured,
After the pre-perforation step,
A detailed adjustment step of performing leveling or verticality adjustment of the penetration part through the construction of the detailed adjustment part in the ground below the perforation part;
Characterized in that it further comprises,
Pre-drilled installation method of jacket foundation structure.