JPH07207640A - Manufacturing of underwater structure - Google Patents

Abstract

PURPOSE:To promote durability so that there is no gap in a connecting section by pouring asphalt compound in the connecting section between asphalt mats monolithically provided to the lower surface of a caisson unit body to fill. CONSTITUTION:For a caisson unit body 2 manufactured by welding iron plates, etc., after asphalt mats 10 and 10a are monolithically provided to the lower surface of iron plate members 6 and 6a, a plurality of caisson unit bodies 2 are connected to each other. When the asphalt mats 10 and 10a are connected, asphalt compound is poured into a gap made in a connecting section 20 between two caisson unit bodies 2 to fill. After that, concrete coatings 9 are formed on the surfaces of side steel plates of a caisson main body, and treatment for promoting durability against sea water is made.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing an undersea structure such as a caisson in which a steel caisson body is constructed by covering the surface of the body with concrete, and an asphalt mat is integrally provided so as to cover the bottom part. In particular, the present invention relates to the construction of an asphalt mat provided in each caisson unit when connecting a plurality of caisson units to construct a structure such as a large caisson body, and a method for connecting the asphalt mat.

[0002]

2. Description of the Related Art Generally, when constructing a breakwater, a seawall, a quay, etc., a foundation is constructed by rubble stones on the ground of the seabed,
A construction method in which a caisson made of concrete is installed on it is used. Since the caisson made of concrete is very heavy, the caisson has, for example, a length of 1
By making it as a handleable size such as a block of 0 to 30 m and arranging those blocks,
A method of constructing a breakwater of a predetermined length is used. However, when constructing a breakwater using concrete caisson as described above, a large number of caisson blocks must be manufactured, and those caisson blocks must be transported over the sea and installed at the construction site. There is a problem that the period becomes long and the process management becomes troublesome.

Therefore, in order to solve the problem of the caisson made of concrete, it has been proposed to use a caisson made of steel. The steel caisson is configured, for example, as disclosed in Japanese Patent Application Laid-Open No. 4-176913, etc., and a caisson as a box-shaped block is manufactured by combining steel materials at a shipyard or the like. A large caisson body is manufactured by connecting a large number of them, and the surface of the body is coated with concrete to form the caisson body as a structure that can withstand seawater.

By installing the caisson on a foundation constructed on the seabed in the same manner as in the case of a concrete caisson, a breakwater, a seawall, etc. can be easily constructed. Further, since the caisson can be configured as a very large one having a length of, for example, about 50 to 100 m, the number of operations such as transportation of the caisson by sea is reduced, and the process control of the construction is facilitated. It is possible to exert advantages such as being possible. However, the caisson as described above is lighter than the one made of concrete, and since the bottom plate part is an iron plate, there is a problem that it is slippery on the rubble of the foundation, etc. There is a problem that it is easily corroded by seawater. Therefore, in order to solve the problems of slippage and corrosion of the bottom plate, it has been proposed to integrally provide an asphalt mat on the lower surface of the bottom plate of the caisson body.

[0005]

In the conventional example described above, the bottom plates of adjacent caisson units are connected by means such as welding, and when connecting the asphalt mats provided in the respective caisson units, It has been necessary to connect reinforcing members such as reinforcing bars provided in the caisson unit body to each other to form an asphalt layer. Further, since the connection portion of the asphalt mat is formed with a very narrow width in the entire width direction of the caisson body, after the lower structure of the caisson unit is created, the connection portion of the adjacent asphalt mat is formed. On the other hand, it is very troublesome to construct asphalt, and there is a problem that it requires a lot of labor.

However, when the caisson body is constructed in the sea, the whole lower part of the caisson body is in contact with the seabed, and if the seawater directly contacts the iron plate of the bottom plate of the caisson body, the iron plate is corroded. Therefore, it is necessary to prevent a gap from being formed in the connection portion of the asphalt mat. Further, the surface around the caisson body is provided with a concrete coating with a predetermined thickness, and by preventing seawater from contacting the side plates of the caisson body, the durability of the caisson body is improved. Is improving. On the other hand, if the asphalt construction of the connection part of the asphalt mat to be placed on the bottom surface of the caisson body is incomplete, if the caisson body moves even slightly to the seabed ground due to the influence of waves. , There is a concern that a gap is formed in the connection part of the asphalt mat, and seawater directly contacts the iron plate.

[0007]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned drawbacks of the conventional construction method, and injects and fills the asphalt into the space of the connecting portion of the asphalt mat integrally provided in the caisson unit. A first object is to provide a method, and a second object is to provide a method capable of preventing bubbles and the like from entering the inside of the connection portion of the asphalt mat when the asphalt is filled. .

[0008]

According to the present invention, concrete is coated on the surface of an undersea structure body such as a caisson made of steel,
An asphalt mat is integrally provided on the lower part of the bottom plate of the main body, and the caisson main body is formed by connecting a plurality of caisson units and installed on the seabed to construct a breakwater, a seawall, etc. of a harbor. Regarding the caisson. In the present invention, when making the caisson body, the lower structure of the caisson unit is first inverted and manufactured, and the stud members are attached to the upper surface of the bottom plate at predetermined intervals to reinforce the reinforcing bars and other reinforcements. A state in which a step of integrally constructing an asphalt mat having members arranged therein, a step of reversing the caisson unit body to return to a use state, and another caisson unit body to be connected are arranged with a predetermined gap therebetween. Then, through the process of filling the asphalt between the asphalt mats arranged on the lower surface of the bottom plate of the adjacent caisson units to form a mat connection part, the asphalt mats provided under the plurality of caisson units are connected to each other. A step of connecting the lower structures of the plurality of caisson units to each other, and then constructing an upper structure corresponding to each caisson unit, And, by applying a bitumen filling portion between adjacent caisson unit body, sequentially construction and constructing a caisson body. And in the present invention, when the plurality of caisson units are connected to form the caisson body, the bottom plate members of the adjacent caisson units are connected to each other, and the space portion formed between the adjacent asphalt mats is formed. A connecting member such as an asphalt sheet is placed in the lower part, and the space between the asphalt mat and the bottom plate member on both sides and the asphalt sheet is filled with asphalt having the same composition as the asphalt mat, and the asphalt is integrally attached to the lower surface of the caisson body. After the process of constructing the mat, a method of forming the caisson body by integrally providing the asphalt mat on the bottom surface is used.

Further, in the present invention, a space portion is arranged between the asphalt mats of the adjacent caisson units so as to be surrounded by the bottom plate member and the asphalt sheet,
Filling the space with asphalt is provided at both ends of the space with an asphalt injection means, an injection box and a check box, and holes are formed at predetermined intervals in the bottom plate member above the space. In doing so, confirm that the asphalt is filled with the hole provided in the bottom plate member, while filling the corresponding hole, perform the filling work into the space portion of the asphalt, the asphalt to the other end of the space portion. After filling and curing the asphalt, a method is used to remove the injection cells and confirmation cells placed on both sides of the space.
Furthermore, in the present invention, a plurality of caisson units are connected to each other, and an asphalt mat is integrally provided on the lower surface of the caisson body, and then an upper structure is constructed above the lower structure of the caisson unit. While connecting the caisson unit, fill the gap under the bottom plate of the caisson unit with asphalt to configure the caisson body as an integral unit, and cover the side of the caisson body that contacts seawater with concrete of a specified thickness. It is also possible to use the construction method configured as described above.

[0010]

In order to connect the asphalt mats arranged on the lower surface of the caisson unit body of the present invention to each other, a large number of air vent holes are provided in the space, and holes are sequentially opened from the portion where it is confirmed that the asphalt is filled. It is possible to prevent air bubbles, etc. from remaining inside the space filled with asphalt by using the method of closing the asphalt, and without directly connecting reinforcing bars or reinforcing members between adjacent asphalt mats. In addition, it is possible to prevent the formation of gaps between the asphalts, and by firmly connecting the bottom plate members of the adjacent caisson units, no gaps are formed between the asphalt mat and the connecting portion, and the bottom plate is not formed. A covering means for the member can be configured.

[0011]

EXAMPLE A method for manufacturing an undersea structure according to the present invention will be described with reference to the illustrated example. In the embodiment of the present invention, the case of manufacturing a steel caisson body will be described as an example,
As the undersea structure, not only the caisson body, but also other structures that stand on their own such that they are in contact with the rubble mound on the seabed, such as breakwaters, revetments, and quays. The asphalt mat can be integrally provided. The example shown in FIG. 1 shows a case of a caisson body 1 used for a breakwater, a seawall, a quay, etc. When the caisson body 1 is prepared, a plurality of caisson units 2, 2a ... It is configured by connecting. The caisson unit constituting the caisson body is manufactured by combining steel materials, and the asphalt mat 10 is integrally attached to the bottom plate member 6 arranged on the lower surface of the caisson unit so that the caisson body is a rubble mound on the seabed. The asphalt mat bears the role of preventing the bottom plate member from sliding directly and protecting the bottom plate member from direct contact with seawater. Also, FIG.
As shown in FIG. 3, leg members 5 and 5a are provided at the lower portion of the caisson body 1 on both sides in the width direction to improve the self-sustaining stability of the caisson body, and the entire periphery is covered with a concrete coating 9 Is provided to constitute a protection means for the steel plate around the caisson body.

As shown in FIG. 2, the caisson unit body 2 constituting the caisson body shown in FIG. 1 has a concrete coating 9 on the surface of a steel plate with respect to both sides in the width direction of the caisson body. , 9a, and the bottom plate member 6
An asphalt mat 10 is integrally attached to the lower surface of the. In addition, the concrete coating provided on the side surface of the caisson unit has a large number of studs, etc. attached in the vertical and horizontal directions in order to improve the adhesion holding performance of the concrete to the steel plate, as in the case where concrete is applied to the surface of a general steel plate. Can be constructed by using a means for supporting concrete rebar, constructing a formwork, and constructing concrete to a predetermined thickness.

When manufacturing the caisson body shown in FIG. 1, as shown in FIG. 3, the caisson unit body 2 is used.
The lower structure 4 is first manufactured in an inverted state, the asphalt mat 10 is applied to the bottom plate member 6, and the lower structure 4 on which the asphalt mat 10 has been applied is inverted again, so that the asphalt mat is ground. Try to return it to the normal position in contact with 19. Then, a plurality of the caisson units 2 are arranged side by side, and as shown in FIG. 4, the work of connecting the bottom plate members 6 and 6a on the lower surface of the caisson units is performed by means such as welding, and Mat connection part 20 between the asphalt mat 10 and 10a
Place so that there is no gap under the caisson unit.

[0014]

[Manufacturing sequence of caisson body and asphalt mat construction] When manufacturing the caisson body 1 as shown in FIG. 1, as shown in FIGS. 5 to 11 below,
The asphalt mat 10 is installed on the caisson unit 2. First, the lower structure 4 of the caisson unit body as shown in FIG. 5 is manufactured. The lower structure 4 shown in FIG. 5 is manufactured in a state in which the lower structure 4 of the caisson unit is inverted by combining steel materials or the like in accordance with the width and length of the caisson unit incorporated in the caisson body. . After that, the bottom plate member 6 of the caisson unit is turned upward, and the steel form frame 18 is temporarily fixed to the side portion of the lower structure by welding or the like, and is integrally provided. The length by which the steel frame 18 projects to the side portion of the bottom plate member 6 is set arbitrarily.

As shown in FIG. 5, after the steel form is attached to both sides of the bottom of the lower structure, as shown in FIG. 6, the stud members 15 ... Are attached to the bottom plate member 6. A means for supporting the asphalt mat and the reinforcing member at a predetermined interval is constructed. The stud member 15 ...
Is attached to the surface of the bottom plate member 6 by means such as welding, and the rising height of the stud member is configured to correspond to the thickness of the upper layer of the asphalt mat. In the example of asphalt mat construction shown below,
The upper layer of the mat indicates a layer adjacent to the bottom plate member 6, and the lower layer of the mat indicates a layer to be constructed thereon. However, when the caisson body is actually constructed on site, the lower part of the mat is placed on the rubble mound on the seabed ground. With the layers positioned on top of the mat top layer, the caisson body is supported.

After the stud members 15, 15a ... Are arranged on the bottom plate member 6 at a predetermined interval as described above, the reinforcing bars 14, 14a ... Are arranged vertically and horizontally as shown in FIG. , Fix the intersection of the reinforcing bars to the head of the stud member. The rebar can be a rebar having an arbitrary diameter, but generally, a rebar having a thickness of about 10 mm is used. After assembling the reinforcing bar on the bottom plate member as shown in FIG. 7, the rubber asphalt primer 16 or the like is applied to the surface of the bottom plate member 6 as shown in FIG. To improve the adhesiveness of the. As the primer,
Any material such as a conventionally known asphalt primer can be used because it promotes adhesion between metal and asphalt.

Next, as shown in FIG. 9, the lower structure 4
A mat upper layer 12 of an asphalt mat is applied on the mat upper layer 12. The thickness of the mat upper layer 12 is up to the height of the stud member, and the mat upper layer is provided with a uniform thickness. Then, as shown in FIG. 10, a reinforcing member 13 such as an asphalt-treated glass fiber net or a welded wire net is arranged on the mat upper layer 12, and the reinforcing member 13 is attached to a stud member 15 or a reinforcing bar 14. On the other hand, they are integrally connected by means such as tying with a wire. Furthermore, FIG.
As shown in FIG. 10, after the reinforcing member is attached in the state of FIG. 10, the mat lower layer 11 is applied, and the mat upper layer 12 and the mat lower layer 11 have a predetermined thickness (for example, about 10 cm). Thickness) asphalt mat is installed integrally on the bottom of the caisson unit. As described above, after the asphalt mat is integrally provided on the bottom plate member of the caisson unit body, the steel form 18 is removed from the side portion of the caisson unit body, and the caisson unit body is inverted again to make the caisson body. It will correspond to the assembly work of.

[0018]

[Processing of connection part of caisson unit] FIG. 5 to FIG.
As shown in FIG. 1, after the asphalt mat is provided on the lower surface of the caisson unit, the caisson unit is returned to the use state, and the caisson body 1 is manufactured by connecting the plurality of caisson units to each other. When assembling the caisson units, as shown in FIG. 12, the connecting portions 6A of the bottom plate members 6 and 6a of the lower structure are attached to the asphalt mat 1
The bottom plate members 6 and 6a are connected to each other by a welded portion 6A. In the example shown in FIG. 5, the leg member 5 of the caisson unit body is used.
The steel form frame 18 arranged at the end portion on the side is provided so as to project outside the end portion of the bottom plate member. However, in the connecting direction of the caisson unit, the steel form frame should be attached to the inside of the bottom plate member 6. As a result, as shown in FIG. 12, in the portion where the caisson unit bodies are connected to each other, the protruding portion of the bottom plate member without the asphalt mat is provided corresponding to the connecting portion.

In the example shown in FIG. 12, before fixing the connecting portions of the two bottom plate members 6 and 6a to each other by welding, an asphalt sheet 17 is laid under the connecting portions of the asphalt mats 10 and 10a. . As the asphalt sheet, it is possible to use glass cloth impregnated with asphalt, asphalt roofing, or any other sheet-shaped member, and a predetermined size for the asphalt mat 10, 10a provided on the lower surface of the caisson unit. The asphalt sheet 17 is arranged with a width of. Therefore, the asphalt mats 10 and 10 on both sides
A space portion 20A defined by the asphalt sheet 17 and the bottom plate members 6 and 6a at the upper portion is formed between a, and the space portion 20A is filled with an asphalt mixture to integrally form the asphalt mat. Can be The asphalt mixture to be filled in the space 20A has improved fluidity compared to that used to form an asphalt mat, and the asphalt is in a good state in a relatively long and narrow space. So that it will flow and be filled.

Before filling the space 20A with the asphalt mixture, in the present invention, as shown in FIG. 13, the air vent holes 2 are formed at predetermined intervals with respect to the bottom plate member.
2 is provided, and a nut or the like is welded and attached to the hole 22. The air vent hole 22 is, for example,
Means such as providing at predetermined intervals along the connecting portion 6A formed by welding the bottom plate member is used. Then, when it is confirmed that the asphalt is filled even in the hole, the bolt 23 is attached to the nut attached to the hole to close the air vent hole as shown in FIG. The mat connection portion 20 is formed by filling 20A with an asphalt mixture.

As described above, when the space portion formed in the connection portion of the asphalt mat is filled with the asphalt mixture material, the asphalt mixture material is, for example,
By using a material having the same properties as the asphalt used for the asphalt mat, it is possible to maintain good adhesion to the asphalt mat. Further, when filling the space portion 20A with asphalt, an auxiliary material for improving the adhesiveness with the asphalt is applied to the bottom surface of the bottom plate member, both end portions of the asphalt mat, and the surface of the asphalt sheet. If so, the adhesiveness between each member and asphalt can be improved. Then, as described above, by connecting the asphalt mat between the two caisson units to be connected, a gap is not formed in the mat connection portion of the asphalt mat, and the caisson unit is protected against the bottom plate member. Can be performed in good condition. To provide said mat connection, for example, FIG.
A means as shown in 5 can be used. Figure 15
In the example shown in FIG. 2, the charging hoppers 26, 26 as the pouring boxes are provided on both sides of the space portion arranged in the connection portion of the caisson unit body.
a is arranged to form a device for supplying asphalt with the bucket 25, and confirmation cells 27, 27a which are configured as rising parts are arranged at the central part of the connection part, with respect to the space part 20A of the connection part. Make sure to inject asphalt from both sides. Further, a partition is provided in the central portion in the lengthwise direction of the space portion 20A of the connecting portion so that the range in which asphalt injected from the charging hoppers on both sides flows can be shortened. Further, by arranging air vent holes at a predetermined interval with respect to the space portion, as shown in FIG. 14, by sequentially closing the holes by bolts from the portion filled with asphalt, The bolts 23 having a predetermined length are arranged in rows on the upper surfaces of the bottom plate members 6 and 6a.

[0022]

[Manufacturing Caisson Body] When manufacturing the caisson body of the present invention, as described above, the lower structures of a plurality of caisson units are laterally connected to each other to form an integral body, The upper structure 3 is constructed with respect to the structure.
In the case of configuring the upper structure 3, as in the case of manufacturing a general steel structure, an iron plate or an internal reinforcing member is incorporated on the lower structure by means such as welding or riveting, A caisson unit with a predetermined height is manufactured.

As described above, the work of providing the concrete coating 9 on the iron plate of the caisson body is carried out after the iron plate is exposed on the surface to form the caisson body in a state where only the bottom surface is covered with the asphalt mat. , Figure 1
The caisson body 1 as shown in FIG. When the surface of the caisson body is coated with the concrete coating 9, as described above, the means for attaching the concrete to the iron plate is applied, and then the concrete is constructed. For that purpose, for example, as in the case of concrete construction on the surface of a general steel plate, a large number of stud members etc. are fixed and attached to the surface of the steel plate, the stud members are made to support vertical and horizontal reinforcing bars, and a formwork is assembled. The concrete can be constructed using a means for constructing the concrete to a predetermined thickness.

The caisson body 1 constructed as described above is hoisted from a manufacturing site on land to a construction site on the sea by a hoist ship or the like, towed and carried to the construction site, and submerged in the sea at the construction site. Use such means to ensure proper positioning at the installation location. after,
The caisson body is filled with seawater, stuffed sand, stones, etc. to increase the weight of the caisson body and to prevent it from moving under the influence of waves, it is used as a marine structure such as a breakwater, seawall, and quay. Install.

The caisson body constructed as described above can be used not only as an undersea structure such as a breakwater but also as an arbitrary undersea structure. Can also be used as a member for supporting a structure without being affected by waves. Therefore, when the caisson body of the present invention is manufactured in a factory, it is not necessary to have a very large weight like a concrete structure, and the caisson unit body forming the caisson body can be moved. It can be done easily. Further, when the caisson body of the present invention is manufactured in a dock or the like of a shipyard, the caisson body is completed in the same manner as when manufacturing a ship or the like. After the caisson body is completed, it is lifted by a hoist ship or the like and transported to the construction site. After the caisson body is submerged at the installation site, the asphalt mat provided at the bottom of the caisson body increases the coefficient of friction between the relatively lightweight caisson body and the supporting rubble mound on the seabed, Problems such as the caisson body moving under the influence of waves will not occur.

[0026]

As described above, in the method for manufacturing an undersea structure of the present invention, since the asphalt mat is arranged on the lower surface of the caisson body without a gap as described above, the caisson body is not affected by waves after it is installed on site. Can be prevented from moving. Further, since the work of attaching the asphalt mat to the lower structure of the caisson unit is performed with the lower structure inverted, the asphalt mat can be easily attached. When connecting the caisson units, the asphalt can be poured into the connection space so that work can be performed efficiently and easily, and the bonding between the asphalt mat attached to the caisson units and the mat connection part. The goodness can be maintained. Furthermore, when connecting the asphalt mats arranged on the lower surface of the caisson unit body of the present invention to each other, a large number of air vent holes are provided in the space portion, and the holes are sequentially opened from the portion where it is confirmed that the asphalt is filled. Since it uses a method of blocking the air bubbles, it becomes possible to prevent air bubbles and the like from remaining inside the space filled with asphalt.
Even without directly connecting reinforcing bars or reinforcing members between adjacent asphalt mats, it is possible to prevent gaps from being formed between the asphalts, and by firmly connecting the bottom plate members of adjacent caisson units. It is possible to configure the covering means for the bottom plate member without forming a gap or the like between the asphalt mat and the connecting portion.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a configuration of a caisson body of the present invention.

FIG. 2 is a sectional view of a caisson unit body that constitutes a caisson body.

FIG. 3 is a cross-sectional view showing a state where assembly of the caisson unit is completed.

FIG. 4 is an explanatory diagram showing a configuration of a connecting portion at the bottom of two caisson unit bodies.

FIG. 5 is an explanatory diagram of a state before the asphalt mat is applied to the lower structure of the caisson unit.

FIG. 6 is an explanatory view showing a state where a stud member is attached to the bottom plate member of the lower structure.

FIG. 7 is an explanatory diagram showing a state in which a reinforcing bar is arranged on a stud member.

FIG. 8 is an explanatory diagram of a work for applying a primer.

FIG. 9 is an explanatory diagram of a work for constructing a mat upper layer.

FIG. 10 is an explanatory diagram of a work of constructing a reinforcing member on the mat upper layer.

FIG. 11 is an explanatory diagram of a work for constructing a lower mat layer.

FIG. 12 is an explanatory diagram of a state in which a space portion is formed in a connection portion of two caisson units.

FIG. 13 is an explanatory diagram of a state in which an air vent hole is provided in the space portion.

FIG. 14 is an explanatory diagram of a work of attaching a bolt to a position where asphalt is filled.

FIG. 15 is an explanatory diagram showing a configuration of a mat connection portion forming device of the present invention.

[Explanation of symbols]

1 caisson body, 2 caisson unit, 3
Upper structure, 4 lower structure, 6 bottom plate member,
9 concrete coating, 10 asphalt mat, 11 mat lower layer, 12 mat upper layer,
13 Reinforcement member, 15 Stud member, 16
Asphalt primer, 17 asphalt sheet, 18 steel formwork, 20 mat connection part, 2
0A space part, 22 air vent hole.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toru Tanada 2-10-9 Akasaka, Minato-ku, Tokyo Nihon Kaisetsu Co., Ltd.

Claims (3)

[Claims] 1. An underwater structure body made of steel such as caisson is coated with concrete, and an asphalt mat is integrally provided under a bottom plate of the body, and the caisson body is composed of a plurality of caisson unit bodies. In the caisson used to construct the caisson main body, the lower structure of the caisson unit is inverted first when the caisson body is constructed. The stud members are attached to the upper surface of the bottom plate at predetermined intervals, and the asphalt mat with reinforcing bars and other reinforcing members placed inside is integrally installed, and the caisson unit is turned upside down. The process of returning to the state of use and the other caisson units to be connected are placed side by side with a predetermined space between them, and they are placed under the bottom plate of the adjacent caisson units. Connecting the asphalt mats provided under the plurality of caisson units to each other through a step of filling asphalt between the mats to form a mat connection portion, and connecting the lower structures of the plurality of caisson units to each other. After connecting to the caisson unit, the process of constructing the upper structure corresponding to each caisson unit and the process of constructing the caisson body by constructing the asphalt filling part between adjacent caisson units are performed sequentially. When connecting the plurality of caisson units to form a caisson body, the bottom plate members of adjacent caisson units are connected to each other, and an asphalt sheet or the like is formed under the space formed between the adjacent asphalt mats. Place the connecting members and place the asphalt in the space between the asphalt mat on both sides and the bottom plate member, asphalt sheet. The undersea structure is characterized by filling the asphalt with the same components as the matte and then constructing the asphalt mat integrally with the bottom surface of the caisson body, and then constructing the caisson body with the asphalt mat integrally provided on the bottom surface. Method of manufacturing things. 2. A space portion is arranged between the asphalt mats of the adjoining caisson units in a state of being surrounded by a bottom plate member and an asphalt sheet, and asphalt injection means, injection boxes and confirmations are provided at both ends of the space portion. In addition to providing a measure, holes are provided at predetermined intervals in the bottom plate member that is the upper part of the space part, and when filling the space part with asphalt, it is provided that the bottom plate member is filled with asphalt. Check the holes, fill the asphalt space while closing the corresponding holes, fill the asphalt to the other end of the space, and after the asphalt has hardened, fill the pouring boxes on both sides of the space. The method for manufacturing an undersea structure according to claim 1, wherein the confirmation box is removed. 3. A plurality of caisson units are connected to each other,
After providing the asphalt mat integrally on the lower surface of the caisson body, build the upper structure on the upper part of the lower structure of the caisson unit, connect the caisson unit, and in the gap under the bottom plate of the caisson unit. The undersea structure according to claim 1, wherein the caisson body is integrally formed by filling with asphalt, and a concrete coating having a predetermined thickness is provided on a side surface of the caisson body which is in contact with seawater. Method of manufacturing things.