KR20060091631A - Form for footing structure using fiber reinforced composites panel of tubular profile and method for constructing footing structure using such form - Google Patents

Abstract

The present invention relates to a formwork for aquatic foundations and a method of constructing a foundation using the same, which has a polygonal or circular hollow section and is made of a fiber-reinforced composite and which can be easily assembled in a mechanical manner. .

In the present invention is configured to have a box shape or a cylindrical shape to correspond to the shape of the foundation structure by the wall 101 and the bottom plate 102 made of a fiber reinforced composite material panel, the bottom plate 102 is a pile 201 Through head 103 is inserted into the head of the head), and the bottom plate 102 is used in the water by using the formwork 100 for underwater foundations having a configuration in which the heavy concrete bedding concrete 105 is installed A method of constructing a basic structure, the method comprising: manufacturing the formwork 100 in advance; Lifting the formwork 100 previously prepared on the foundation ground 200 on which the pile 201 is installed; The formwork 100 is mounted downwardly in a state where the pile 201 is located at the top of the head so that the head of the pile 201 is inserted through the through hole 103 of the bottom plate 102 of the formwork 100; Backfilling the foundation grounds around the formwork 100 to prevent flow of the formwork 100; The anti-floating bracket 202 is installed at the head of the pile 201, and a sealing member 203 is installed at the lower portion of the bracket 202 to seal a gap between the through hole 103 and the pile 201. step; Placing concrete between the bracket 202 and the bedding concrete 105 to integrate them with each other; Manufacturing the foundation structure 300 by draining the water in the formwork 100 and pouring the foundation concrete; And removing the formwork 100 portion which is not filled with the foundation concrete, and the formwork 100 portion surrounding the foundation structure 300 is left as it is. Formwork for underwater foundations is provided for this purpose.

Fiber reinforced, composite, formwork, underwater foundation

Description

Form for Footing Structure using Fiber Reinforced Composites Panel of Tubular Profile And Method for Constructing Footing Structure using such Form}

1 is a schematic perspective view of a formwork for underwater foundations according to the present invention.

Figure 2a is a schematic perspective view showing the assembly structure of the flat composite panel unit forming the wall and the bottom plate of the formwork.

Figure 2b is a schematic perspective view showing the assembly structure of the curved composite panel unit forming the wall of the cylindrical formwork.

Figure 2c is an enlarged view of the coupling form of the protrusion coupling portion provided in the composite panel unit.

3A to 3I are schematic views showing each step of the construction method of the underwater foundation according to the present invention, respectively.

4 is a detailed view of circle A shown in FIG. 3F.

<Brief description of the main parts of the drawing>

100: formwork for foundation structure

101: wall

102: bottom plate

201: pile

300: basic structure

The present invention relates to a formwork used for constructing a foundation structure in water and a method for constructing a foundation structure using the same. Specifically, the present invention has a polygonal hollow section, is made of fiber-reinforced composite material, and is robust in a mechanical manner. The present invention relates to a formwork for underwater foundations fabricated using a panel that can be easily assembled, and a method for constructing foundations using the same.

In constructing the foundation on the lower part of the bridge structure, conventionally, the foundation is installed around the upper part of the pile to be installed with soil and sheet piles to block the water and block the water, and then install ordinary formwork and concrete Was cast in place to form a concrete foundation on top of the pile. Recently, a method of constructing a foundation by constructing a precast concrete member or a steel member on land and transporting it to the sea, mounting it on top of a pile, and pouring field concrete for foundation formwork is also proposed.

However, the base formwork made of such concrete or steel has a limitation that the degradation of concrete or corrosion of steel due to salt or erosion cannot be avoided due to the characteristics of the material. In addition, such conventional base formwork has a drawback that it is heavy in handling and on-site transportation because of its heavy weight and requires a lot of cost.

On the other hand, in recent years, hollow fiber-reinforced composite panels having light weight, high strength, and high durability have been developed, and interest in utilizing such composite panels as civil engineering and building materials has been increasing. However, in the case of a conventional composite material panel, it is custom-made to have a predetermined width in accordance with a structure such as a bottom plate, if the width and length is large, there is a disadvantage that the handling is difficult due to the weight increases, each structure size There is a limit that the generality of the structure is inferior because the special production must be made every time according to the order.

The present invention was developed to overcome the shortcomings and limitations of the prior art as described above, in the construction of the foundation structure installed in the water, based on the fiber-reinforced composite panel of hollow section is increasing interest as civil engineering, building materials It is intended to be used as formwork for structures. To this end, the present invention proposes a formwork for underwater foundations made of fiber-reinforced composite panels of hollow sections and a new method for constructing foundations in water using them.

In addition, the present invention provides a formwork for the basic structure using the fiber-reinforced composite panel, fabricated in a standard unit unit of a predetermined width and combined by a simple mechanical detachable method of the fiber-reinforced composite material The purpose of the panel is to make it easier and more economical to manufacture the formwork for underwater foundations and to construct the foundations.

In the present invention, in order to achieve the above object, as a formwork for underwater foundations installed in water, to have a box or cylindrical shape to correspond to the shape of the foundation structure by the wall and the bottom plate made of fiber reinforced composite panel. Configured; The bottom plate is provided with a formwork for underwater foundations, characterized in that the through-hole is formed is inserted into the head of the pile.

In the present invention, the fiber-reinforced composite panel constituting the wall and the bottom plate in the formwork is made of the assembly of the panel unit, the panel unit is composed of a hollow having a hollow part consisting of a top plate, a bottom plate and an abdominal plate. Become; A first downward protrusion coupling portion and a second downward protrusion coupling portion are formed on one side of the panel unit, and the first downward protrusion coupling portion is formed downward from an end portion of the upper extension portion in which the upper plate is further extended to the side surface. The second downward protrusion coupling portion is formed to protrude downward from the outer surface of the outer abdominal plate; On the other side of the panel, a first upward protrusion coupling portion and a second upward protrusion coupling portion which are mechanically coupled to the first and second downward protrusion coupling portions, respectively, are detachably formed. A protruding upward from an outer surface of the abdominal plate, and a second upwardly protruding portion provided upwardly from an end portion of the lower extension portion in which the lower plate is further extended; The projection coupling portion is formed with a projection corresponding to each other to form a mechanical coupling by biting each other, having a structure to form a composite panel by being coupled to each other by a mechanical detachment method in a direction perpendicular to the neighboring panel unit A formwork for underwater foundations is provided.

In the present invention, the bottom plate of the formwork can be installed anti-floating bedding concrete. In addition, in the form of the present invention, in the state in which the head of the pile is inserted into the through hole of the bottom plate may be integrated by placing underwater concrete between the anti-floating bracket and the bedding concrete installed on the pile head.

In the present invention, in placing underwater concrete between the bracket and the bedding concrete, after the sealing member is installed between the periphery of the through-hole and the head periphery of the pile, and between the upper periphery of the through-hole and the bottom of the bracket It is preferable to pour the underwater concrete.

In addition, in placing the underwater concrete, the transverse reinforcement reinforced to the bedding concrete is further reinforced to protrude out of the bedding concrete toward the pile head direction, and the ends of the transverse reinforcing bars are welded to the periphery of the pile head and the bracket, respectively. After connection by means, it is also preferable to pour the underwater concrete.

In the present invention, a method for constructing the foundation structure in water using the formwork, comprising: preparing the formwork in advance; Lifting the formwork prefabricated onto the foundation on which the pile is installed; Placing the formwork downwardly in the state where the formwork is located at the top of the pile head so that the pile head is inserted through the through-hole of the formwork base plate; Backfilling the foundation ground around the formwork to prevent flow of the formwork; Installing a floating prevention bracket at the head of the pile, and installing a sealing member at the lower portion of the bracket to seal a gap between the through hole and the pile; Placing concrete between the bracket and the bedding concrete to integrate each other; Manufacturing a foundation structure by draining the water in the formwork and pouring the foundation concrete; And removing the formwork portion in which the foundation concrete is not filled, and leaving the formwork portion surrounding the foundation structure as it is, wherein the construction method of the underwater foundation structure is provided.

In manufacturing the formwork in the construction method of the present invention described above, it is preferable to produce a composite panel using a panel unit using the mechanical assembly structure as described above, and to use the panel as a floor plate and a wall.

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration and embodiment of the present invention. 1 is a schematic perspective view of the formwork 100 for underwater foundations according to the present invention. As shown in the figure, the formwork 100 of the present invention is composed of a wall 101 and the bottom plate 102, the bottom plate 102 is formed with a through hole 103 into which the head of the pile is inserted. . On the inner surface of the wall 101, the braces 104 may be installed in the transverse direction for reinforcement. In FIG. 1, the through hole 103 formed in the bottom plate 102 is indicated by a dotted line for convenience.

In the present invention, the panel forming the wall 101 and the bottom plate 102 is made of a fiber-reinforced composite panel of hollow cross section, and the fiber-reinforced composite panel (hereinafter referred to as "composite panel") is made of poly It is made of a fiber-reinforced composite material composed of a resin selected from ester, vinyl ester, panol or epoxy, and reinforcing fibers and manufactured by a pultrusion molding method. In the present invention, it is preferable in many aspects to fabricate a structure using the prefabricated composite panel of the novel structure developed by the present inventor.

FIG. 2A is a schematic perspective view showing the assembling structure of the planar composite panel unit 10b constituting the wall 101 and the bottom plate 102. On the other hand, the wall 101 may be configured in the form of a cylindrical tank wall, not a box form as shown in Figure 1, Figure 2b is a schematic view of the cylindrical wall form using the curved composite panel unit (10a) A perspective view of phosphorus is shown. Figure 2c is an enlarged view of the coupling form of the protrusion coupling portion provided in the composite panel unit (10a, 10b). The curved composite panel unit 10a and the flat composite panel unit 10b have only a difference in curve and plane, but the coupling structure is the same. In the following, the structure of the composite composite panel unit 10b will be based on the flat composite panel unit 10b. Explain.

As shown in FIG. 2A, the composite panel unit 10b (hereinafter referred to as a “panel unit”) is composed of an upper plate 12, a lower plate 13, and an abdominal plate 14 and has a hollow portion 16. . The panel unit 10b is assembled such that the neighboring panel unit 10b 'and its side are integrally connected to each other. The panel unit 10b is approached and coupled in a direction perpendicular to the neighboring panel unit 10b' and is adjacent to the panel unit 10b. ') And simple yet robust mechanical detachable. To this end, a first downward protrusion coupling portion 11a and a second downward protrusion coupling portion 11b are formed on one side of the panel unit 10b, and the first and the second side protrusions are formed on the other side of the panel unit 10b. A first upward protrusion coupling portion 11a 'and a second upward protrusion coupling portion 11b' are formed to be mechanically coupled to the second downward protrusion coupling portions 11a and 11b so as to be detachable from each other. Specifically, in the exemplary embodiment shown in the drawing, one side of the panel units 10b and 10b 'includes an upper extension 17 on which the upper plate 12 extends, and a lower portion on which the lower plate 13 extends. An extension portion 18 exists, and the first downward protrusion coupling portion 11a protrudes downward from an end portion of the upper extension portion 17. In addition, on one side of the panel units 10b and 10b ', the second downward protrusion coupling portion 11b protrudes downward from the outer surface of the outer abdominal plate 14. On the other hand, on the other side surface of the panel unit (10b, 10b '), the first upward protrusion coupling portion (11a') which is engaged with the first downward protrusion coupling portion (11a) is upward from the outer surface of the outer abdominal plate (14) It is provided to protrude, and at the lower end of the lower extension portion 18 is provided with a second upward protrusion coupling portion (11b ') is fastened to the second downward protrusion coupling portion (11b).

In FIG. 2C, an enlarged view of an embodiment in which the first downward protrusion coupling portion 11a and the first upward protrusion coupling portion 11a 'are combined is shown. The first downward protrusion coupling portion 11a and the first downward protrusion coupling portion 11a' are coupled to each other. The upward protrusion coupling portions 11a 'are formed with protrusions 11c and 11c' of corresponding shapes, respectively, so that the protrusions 11c and 11c 'are bitten with each other to form a strong mechanical coupling. On the other hand, in order to increase the resistance in the horizontal direction in the state where the protrusion coupling portion is coupled with each other, the end of the first upward protrusion coupling portion (11a ') to support the rear end of the upper extension portion (17) It is preferable that the protruding support portion 19 is formed to protrude. The structure described above is equally applied to the coupling structure of the second downward protrusion coupling portion 11b and the second upward protrusion coupling portion 11b '. For reference, in FIG. 2C, an example of the arrangement of fibers inside the protrusion coupling parts 11a and 11a 'is shown as a dotted line. In the present invention, the inside of the protrusion coupling parts 11a, 11a', 11b and 11b 'is shown. Since the fibers may be arranged in the longitudinal direction as shown by the dotted lines in the figure, even if shear force is applied to the protrusion coupling portion between the panel units 10b and 10b ', sufficient rigidity can be exerted through the fiber arrangement.

When the panel unit 10b of the present invention is connected to the neighboring panel unit 10b ', the panel unit 10b is coupled to the neighboring panel unit 10b' by being placed and pressed from above as shown in FIG. 2A. The first downward protrusion coupling portion 11a of the panel unit 10b, which is positioned downward from the top, is fitted into and coupled to the first upward protrusion coupling portion 11a 'of the neighboring panel unit 10b'. The second upward protrusion coupling portion 11b 'of the 10b' is fitted to the second downward protrusion coupling portion 11b of the panel unit 10b so that both panel units 10b and 10b 'are mechanically engaged. Are firmly combined.

At this time, since the first upward protrusion coupling part 11a 'and the second downward protrusion coupling part 11b have a predetermined elasticity, when the panel unit 10b is pressed with a force of a predetermined level or more, the protrusions 11c, As the slip occurs between 11c '), the first upward protrusion coupling portion 11a' and the second downward protrusion coupling portion 11b are finely retracted to facilitate mechanical coupling of the protrusion period. After the projections 11c and 11c 'are slipped from each other, the first upward protrusion coupling portion 11a' and the second downward protrusion coupling portion 11b are returned to each other by elasticity so that the protrusions 11c and 11c 'are rotated. They are firmly inherited from one another. In particular, in the present invention is provided with a projection supporting portion 19 for supporting the end of the first upward protrusion coupling portion (11a ') and the second downward protrusion coupling portion (11b) from the rear to exert a horizontal resistance force, projections After the coupling portions are coupled to each other, the first upward protrusion coupling portion 11a 'and the second downward protrusion coupling portion 11b do not open so that the protrusion coupling portions may be coupled to each other very firmly.

On the other hand, when the panel unit 10b is drawn out with a predetermined force or the like, the slippage occurs between the protrusions 11c and 11c 'as described above, and the first upward protrusion coupling part 11a' and the second downward protrusion are similar to the above. Coupling portion 11b is finely backed to be able to easily release the coupling state between the protrusion coupling portion. Therefore, the structure can be freely assembled and disassembled, and the panel can be recycled. On the other hand, in the present invention, the protrusion coupling portion is detachably coupled mechanically, according to the user's intention in practice may be used by permanently bonding the protrusion coupling portion by applying an adhesive.

Next, a method of constructing an underwater foundation structure using the formwork 100 will be described. 3A to 3I are schematic views showing each step of the construction method of the underwater foundation according to the present invention. Formwork 100 is shown in cross section in FIGS. 3A-3I.

First, as illustrated in FIG. 3A, the foundation ground 200 is dredged to select a position where the foundation structure is to be installed. Dredge foundation ground 200 is installed with a pile 201 (Fig. 3b). The pile 201 is a cast in place and / or steel pipe pile. As described above with reference to FIGS. 2A to 2C, a formwork 100 for underwater foundations is manufactured using a composite panel (FIG. 3C). At this time, as shown in Figure 3c is installed on the bottom plate 102, anti-floating bedding concrete 105. The bedding concrete 105 is to function as a weight to prevent the formwork 100 from floating by buoyancy. In addition, the bedding concrete 103 also functions as a connecting body with the pile 201, as will be described later.

Lifting the formwork 100 manufactured as described above is mounted on the pile 201 (Fig. 3d). Specifically, if the formwork 100 is mounted downward on the head of the pile 201 as shown in Figure 3d, the head of the pile 201 to the through hole 103 formed in the bottom plate 101 Is inserted. As such, when the formwork 100 is mounted on the pile 201, the backfill work and the injury prevention bracket installation work are performed to prevent the flow of the formwork 100 and to prevent injury. That is, as shown in Figure 3e, to fill the base ground around the formwork 100 to prevent the flow of the formwork (100). Subsequently or in parallel therewith, a bracket for preventing injury of the formwork 100 is installed (FIG. 3F). FIG. 4 is a detailed view of the circle A of FIG. 3F, in which a floating prevention bracket 202 is integrally installed at a predetermined position around the head of the pile 201. In this case, a sealing member 203 made of a rubber pad or the like is installed in the lower portion of the anti-floating bracket 202 to seal a gap between the through hole 103 of the bottom plate 102 and the head of the pile 201. The bottom plate 102 abuts against the sealing member 203 installed vertically around the head of the pile 201 may be filled with concrete 106 in the bottom plate 102 at a predetermined length.

On the other hand, as shown in Figure 4, after installing the anti-floating bracket 202, the fastening underwater concrete (204) is poured between the bedding concrete 105 and the bracket 202 by placing the fastening concrete 105 and the anti-floating bracket ( Integrating the 202, it is more effective to prevent the injury of the formwork (100). At this time, as shown in the drawings, the transverse reinforcement 107 reinforced to the bedding concrete 105 is reinforced so as to protrude further out of the bedding concrete 105 toward the head 201 head direction, and the The ends may be connected to the periphery of the pile 201 and the bracket 202 by welding or the like, and then, the pour underwater concrete 204 may be poured. In this case, it is possible to achieve a more robust connection of the bedding concrete 105 and the pile 201 and the bracket 202 and the reinforcing reinforcement effect of the fastening underwater concrete 204.

Subsequently, after draining the water filled in the formwork 100 to make it dry, the foundation concrete is poured to construct the foundation structure. When placing the foundation concrete, it is preferable to pour in multiple stages as shown in Figs. 3g and 3h. That is, as shown in FIG. 3g, the first stage of the foundation concrete 301 is poured at a predetermined height, and as shown in FIG. )) When the casting and curing of the foundation concrete is completed, the unnecessary portion of the upper formwork 100 is removed, and the formwork portion 100 of the upper portion of the foundation structure 300, which is not filled with concrete, is removed and the periphery of the foundation structure 300 is removed. The formwork surrounding the lower part and 100 is left as it is. As such, in the present invention, since the formwork 100 forming the basic foundation structure 300 remains as it surrounds the outer surface of the foundation structure 300, the reinforcement effect of the restraint of the foundation structure 300 as well as the foundation concrete is It is possible to effectively prevent damage due to continuous contact with water, for example, deterioration of the foundation concrete such as salt damage by seawater.

By the formwork for the base structure and the construction method of the present invention as described above, in the construction of the base structure in water, it is possible to fully utilize the advantages (light weight, high durability, etc.) of the composite panel. In short, in the prior art, the formwork for the basic structure was manufactured using heavy precast concrete or steel, but in the present invention, since the formwork is manufactured using a composite panel having a light weight and high durability, the formwork is easily transported. As a result, the construction of the foundation structure becomes easier.

In addition, in the construction method of the present invention, even after the construction of the foundation structure is completed, it is possible to leave the outer surface of the foundation structure with the form made of composite panel, so that the underwater foundation structure installed in the seabed or the sea deteriorates in contact with water It can be effectively prevented.

On the other hand, in the present invention, since the composite panel forming the wall and the bottom plate of the formwork is manufactured using a panel unit by mechanical coupling, the panel is very easy to manufacture, and is particularly useful for panel recycling. In addition, in manufacturing the panel, since the size can be easily adjusted, it is possible to easily form the form to match the size of the base structure to be manufactured to the size of the wall and the bottom plate.

In the above described the configuration and features of the present invention based on the embodiment according to the present invention, the present invention is not limited to this and can be changed freely according to the technical idea of the present invention.

Claims (7)

Formwork for underwater foundations installed in water, The wall 101 and the bottom plate 102 made of a fiber reinforced composite panel are configured to have a box shape or a cylindrical shape so as to correspond to the shape of the basic structure; Formwork for underwater foundations, characterized in that the bottom plate 102 is formed with a through hole 103 is inserted into the head of the pile 201. The method of claim 1, Fiber reinforced composite panel constituting the wall 101 and the bottom plate 102 is composed of the assembly of the panel unit, The panel unit is composed of an upper plate (12), a lower plate (13) and an abdominal plate (14) and a hollow shape having a hollow portion (16); A first downward protrusion coupling portion 11a and a second downward protrusion coupling portion 11b are formed at one side of the panel unit, and the first downward protrusion coupling portion 11a is formed on the side of the upper plate 12. It is formed in a downward direction at the end of the upper extension portion 17 is further extended, the second downward protrusion coupling portion (11b) is formed in a shape protruding downward on the outer surface of the outer abdominal plate (14); On the other side of the panel, the first upward protrusion coupling portion 11a 'and the second upward protrusion coupling portion (11a') which are mechanically coupled to the first and second downward protrusion coupling portions 11a and 11b so as to be detachable from each other. 11b ') is formed, and the first upward protrusion coupling portion 11a' protrudes upward from the outer side of the outer abdominal plate 14, and the second upward protrusion coupling portion 11b 'is provided on the lower plate 13. It is provided upward from the end of the lower extension portion 18 which is further extended; The protrusion coupling portions 11a, 11a ', 11b, and 11b' are formed with protrusions 11c and 11c 'corresponding to each other so as to form a mechanical coupling to each other. Formwork for underwater foundations characterized in that it has a structure that is bonded to each other by a detachable method to form a composite panel. The method according to claim 1 or 2, The bottom plate 102 is a formwork for underwater foundations, characterized in that the anti-floating bedding concrete 105 is installed. The method of claim 3, Underwater concrete between the anti-floating bracket 202 installed on the head of the pile 201 and the bedding concrete 105 in the state that the head of the pile 201 is inserted into the through hole 103 of the bottom plate 102. Formwork for underwater foundations, characterized in that the 204 is poured and integrated. (Add) The method of claim 4, wherein  The underwater concrete 204 between the bracket 202 and the bedding concrete 105 is between the periphery of the through hole 103 into which the pile 201 is inserted and the periphery of the head of the pile 201 and the through hole 103. Formwork for underwater foundations, characterized in that after the sealing member 203 is installed between the upper peripheral portion and the lower surface of the bracket (202). The wall 101 and the bottom plate 102 made of a fiber reinforced composite panel are configured to have a box shape or a cylindrical shape so as to correspond to the shape of the foundation structure, and the head plate 102 has a head portion of the pile 201. The through-hole 103 is formed is inserted, the bottom plate 102 is used to form the foundation in the water by using the formwork 100 for underwater foundations having a configuration in which the heavy concrete bedding concrete 105 is installed As a method of construction, Manufacturing the formwork 100 in advance; Lifting the formwork 100 previously prepared on the foundation ground 200 on which the pile 201 is installed; The formwork 100 is mounted downwardly in a state where the pile 201 is located at the top of the head so that the head of the pile 201 is inserted into the through hole 103 of the bottom plate 102 of the formwork 100; Backfilling the foundation grounds around the formwork 100 to prevent flow of the formwork 100; The anti-floating bracket 202 is installed at the head of the pile 201, and a sealing member 203 is installed at the lower portion of the bracket 202 to seal a gap between the through hole 103 and the pile 201. step; Placing concrete between the bracket 202 and the bedding concrete 105 to integrate them with each other; Manufacturing the foundation structure 300 by draining the water in the formwork 100 and pouring the foundation concrete; And Removing the formwork portion 100 is not filled with the basic concrete, and the formwork part 100 surrounding the foundation structure 300, the construction method of the underwater foundation structure, characterized in that it comprises a step including remaining. The method of claim 6, In the step of manufacturing the formwork 100 in advance, the upper plate 12, the lower plate 13 and the abdominal plate 14 is composed of a fiber-reinforced composite panel unit composed of a hollow type having a hollow portion 16 By manufacturing a fiber reinforced composite panel constituting the wall 101 and the bottom plate 102, and comprising the process of assembling the wall 101 and the bottom plate 102 made of the panel,  The panel unit has a first downward protrusion coupling portion 11a and a second downward protrusion coupling portion 11b formed on one side thereof, and the first downward protrusion coupling portion 11a is formed by the upper plate 12. It is formed in a downward direction at the end of the upper extension portion 17 is formed extending further to the side, the second downward protrusion coupling portion (11b) is formed in a shape protruding downward on the outer surface of the outer abdominal plate 14 To be made; On the other side of the panel, the first upward protrusion coupling portion 11a 'and the second upward protrusion coupling portion (11a') which are mechanically coupled to the first and second downward protrusion coupling portions 11a and 11b so as to be detachable from each other. 11b ') is formed, and the first upward protrusion coupling portion 11a' protrudes upward from the outer side of the outer abdominal plate 14, and the second upward protrusion coupling portion 11b 'is provided on the lower plate 13. It is manufactured to be provided upward from the end of the lower extension portion 18 is formed to extend further; The protrusion coupling portions 11a, 11a ', 11b, and 11b' are formed with protrusions 11c and 11c 'corresponding to each other so as to form a mechanical coupling to each other. Construction method of the underwater basic structure, characterized in that to produce a composite panel by combining with each other by a removable method.

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