JPH1096241A - Jacket structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain lightening by connecting a plurality of pile guide members by a connecting member and installing a jacket, in which a ballast tank is mounted at a central section, on the bottom of the water. SOLUTION: The jacket structure 11 is composed of connecting members 12, pile guide members 13, a ballast tank 14 and a pier lower section 51a. The structure 11 manufactured in a factory is floated on the sea and towed up to the place of installation, the inside of the tank 14 is supplied with water, and the Jacket structure 11 is sunk while being positioned by beforehand driven temporary piles 23 for the execution of works. Inserting pipes 15 are inserted into the guide members 13 and penetrated to a soft ground 42, piles 16 are driven to a bearing ground 43 through the pipes 15, and a pier 51 is elongated from the lower section 51a. The pier 51 is constructed, water is drained from the tank 14 and the weight of the pier 51 is absorbed, and load working to the pile 16 is decreased while overturning moment is lowered. Accordingly, since no large-sized floating crane is required in transport, lifting works, etc., cost can be reduced, and the number of the piles can be diminished, and no footing can be needed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jacket structure which is used by being installed on a submarine ground when a structure such as a pier is constructed.

[0002]

2. Description of the Related Art In general, direct foundations, pile foundations, caisson foundations, steel pipe foundations, jacket-type foundations, and the like have been conventionally known as bridge foundations. FIG. 7 shows an outline of a pier constructed by a conventional pile foundation, FIG. 8 shows an outline of a pier constructed by a conventional caisson foundation, and FIG. 9 shows an outline of a pier constructed by a jacket type foundation.

[0003] In a pier constructed with a conventional pile foundation, as shown in FIG. 7, a soft ground 102 is formed on a submarine ground on a support ground 101, and a plurality of piles 103 are formed by a pile driver (not shown). Are penetrated through the soft ground 102 to the support ground 101, and a footing 104 is constructed on each of the piles 103 by reinforced concrete.
An anchor bolt 105 and an anchor frame 106 are embedded in the footing 104 in advance.
A pier 107 is erected on 04 and joined. Therefore,
The load acting on the pier 107 is supported via the anchor bolt 105, the anchor frame 106, the footing 104, and the pile 103.
It is transmitted to 01 and received.

In a conventional pier constructed by a caisson foundation, as shown in FIG.
The upper surface of the ground 111 is leveled to form a ground level ground 112 having a predetermined area, and a caisson 114 in which concrete 113 is cast is set in the ground level ground 112. An anchor bolt 115 and an anchor frame 116 are embedded in the caisson 112 in advance, and a pier 117 is erected on the caisson 114 to be joined. Therefore, the load acting on the pier 117 is the anchor bolt 115, the anchor frame 116, the caisson 114.
Is transmitted to the supporting ground 111 via the base and received.

Further, in a pier constructed by a conventional jacket-type foundation, as shown in FIG. 9, a large number of guide pipes 122 are connected to a connecting member 12 with respect to a seabed supporting ground 121.
A jacket structure 124 constituted by being connected by 3 is installed, and each guide pipe 12 is
A plurality of piles 125 are driven into the support ground 121 by using 2. A footing 126 is constructed on the jacket structure 124 by reinforced concrete. An anchor bolt 127 and an anchor frame 128 are embedded in the footing 126 in advance.
A pier 129 is erected and connected to the pier. Therefore, the load acting on the pier 129 is the anchor bolt 127, the anchor frame 128, the footing 126, the jacket structure 124, the pile 1
It is transmitted to the support ground 121 via 25 and received.

[0006]

However, the above-described conventional method of constructing a pier by using each foundation has the following problems. That is, in the case of a pile foundation, there is a problem in that when a pier is constructed on the seabed having a relatively large water depth, technical difficulty is involved and the cost becomes high. In the case of caisson foundation, there is no problem if the seabed is up to a depth of about 50 mm, but if it is deeper than the seabed, large-scale offshore construction is required to form the ground level ground 112, which is expensive. The construction period will be prolonged, during which the route must be restricted. Further, if there is soft ground on the upper layer of the supporting ground, there is a problem that ground improvement work is also required. Further, in the case of a jacket type foundation, it is usually applied for oil drilling in deep sea waters. Therefore, when the load applied to the upper part of the jacket structure 124 is large, such as a pier of a large bridge, it is necessary to increase the number of piles 125 driven into the support ground 121,
Increasing the number of guide pipes 122 increases the size of the jacket structure 124 and the footing 126. Also, after the jacket structure 124 is manufactured at the factory, it is carried on a barge or the like, transported to the sea to the installation position, and lifted and installed by a crane ship. There are problems that the size of the crane ship is increased, the cost is increased, and the working period is lengthened.

An object of the present invention is to solve such a problem, and an object of the present invention is to provide a jacket structure in which the workability of construction work of a structure is improved by reducing the size and weight and reducing the cost. And

[0008]

According to the present invention, there is provided a jacket structure for installing a structure on a submerged ground, wherein a plurality of pile guide members are connected by connecting members. The ballast tank is attached to a central portion thereof.

Accordingly, the jacket structure is mounted on the underwater ground by placing the jacket structure on the underwater ground and driving a predetermined number of piles into the underwater ground using the pile guide member. In this case, the ballast tank is provided. Buoyancy is acting on the upper part of the jacket structure, so even if a heavy object is joined to the upper part of the jacket structure, part of the load of this heavy object will be received by the buoyancy of the ballast tank. A large load does not act on the structure, and the size and weight of the jacket structure can be reduced and the cost can be reduced by reducing the number of pile guide members.

[0010] The jacket structure of the present invention is characterized in that the legs of the structure are integrally provided.

Therefore, when the jacket structure is installed on the underwater ground, the structure can be easily constructed by extending the legs of the structure integrally provided with the jacket structure, and the concrete structure can be formed. Footing is not required.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a front view of a pier constructed by a jacket structure according to an embodiment of the present invention, FIG. 2 is a side view of the pier, FIG. 3 is a plan view of the jacket structure, FIG.
FIG. 6 to FIG. 6 schematically show the construction work of the pier by the jacket structure.

As shown in FIGS. 1 to 3, the jacket structure 11 of the present embodiment comprises a submarine ground 41 (soft ground 4).
2. Bridge pier 5 as a structure installed on supporting ground 43)
1 to build one. That is, the jacket structure 11 includes a plurality of pile guide members 13 connected by a connecting member 12, a ballast tank 14 mounted at the center, and a lower portion 51a of a pier 51 provided integrally with the ballast tank 14. It is composed of

The pile guide member 13 has a cylindrical shape with a predetermined length, and is integrally connected by the connecting member 12 in a state of being arranged in a plurality of squares on the outer peripheral portion. Upright, the pile guide members 13 on both sides are inclined at a predetermined angle. The guide member 13 is for driving the pile 16 into the underwater ground 41 via the insertion pipe 15 when the jacket structure 11 is installed on the underwater ground 41. The ballast tank 14 serves to balance the weight of the jacket structure 11 by supplying and draining water to the inside. The pier lower part 51a is for constructing the pier 51 using the pier lower part 51a after the jacket structure 11 is installed.

Here, a method of constructing the pier 51 on the underwater ground 41 using the above-described jacket structure 11 will be described with reference to FIGS.

The jacket structure 11 is manufactured at a predetermined factory. First, the jacket structure 11 is transported from the factory to an installation location. As shown in FIG. 4, the ballast tank 14 is
By supplying a small amount of water into the inside, the jacket structure 11
The whole is balanced. Then, the jacket structure 11 floating on the sea 21 by the tugboat 22 is towed,
Transport to the installation location. On the other hand, in the installation location, the construction temporary pile 23 for positioning the jacket structure 11 on the underwater ground 41 (soft ground 42) is previously driven. Then, when the jacket structure 11 is transported to the installation location, the water is further supplied into the ballast tank 14 so that the jacket structure 11 sinks while being balanced, and is positioned and mounted by the construction temporary pile 23.

When the jacket structure 11 is positioned at the installation place by the temporary pile 23 for construction,
As shown in FIG. 5, the pile construction machine 24 is mounted on the upper part of the jacket structure 11, and the insertion pipe 15 is inserted into the pile guide member 13 of the jacket structure 11 using the pile construction machine 24. The insertion tube 15 is penetrated into the soft ground 42,
Subsequently, the pile 16 is driven into the support ground 43 via the insertion pipe 15. This pile driving operation using the pile construction machine 24 is performed for each of the pile guide members 13 and the jacket structure 1
1 is fixed to the supporting ground 43. When the underwater ground 41 is not the soft ground 42 but the support ground 43, the insertion pipe 15 may be omitted and the pile 16 may be directly driven into the support ground 43 using the pile guide member 13.

As described above, when the pile driving operation is completed and the jacket structure 11 is installed on the underwater ground 41 by the large number of piles 16, the pier 5 is used by using the jacket structure 11.
Build one. As shown in FIG.
A tower crane 25 is mounted on the upper part of the bridge 1, and the pier 51 is extended from the pier lower part 51 a using the tower crane 25. In this way, as shown in FIGS. 1 and 2, when the pier 51 is constructed on the upper part of the jacket structure 11, the bridge girder 53 is erected by using the plurality of cables 52 on the plurality of piers 51, The cable-stayed bridge is completed. After the pier 51 is constructed, the water in the ballast tank 14 is drained to give buoyancy, thereby absorbing the weight of the pier 51 and reducing the load acting on each pile 16 supporting the jacket structure 11. .

In the present embodiment, the ballast tank 14 is provided in the jacket structure 11, so that the marine vessel 21 is towed by the buoyancy when transported from the factory to the installation location, and is provided with water to sink. In addition, a large-sized crane ship for transportation is not required, and lifting and hanging work at the time of installation is not required, so that the cost can be reduced, and the working efficiency can be improved by shortening the working time. In addition, jacket structure 1
When transporting the pier 1, a small amount of water is supplied to the ballast tank 14 to maintain balance, and when installing the pier 51, the pier 51 is drained and buoyant after construction by supplying a large amount of water. Can be reduced. Therefore, the number of piles 16 that support the jacket structure 11 is reduced, and the size and weight of the jacket structure 11 can be reduced.

Also, in this embodiment, by providing the pier lower part 51a integrally with the jacket structure 11, footing is not required and the size and weight of the jacket structure 11 can be reduced. Weight is reduced and the overturning moment is reduced.

[0022]

According to the jacket structure of the present invention, as described in detail in the above embodiments, a plurality of pile guide members are connected by a connecting member, and a ballast tank is mounted at a central portion. At the time of transporting the body, at the time of installation, by using the buoyancy by supplying and draining water to the ballast tank after installation, it is possible to reduce the number of pile guide members and reduce the size and weight of the jacket structure and reduce the cost, It is possible to shorten the work time and simplify the work in the work of transporting and installing the jacket structure and the structure, and to improve the workability of the construction work of the structure.

Further, according to the jacket structure of the present invention, since the legs of the structure are provided integrally, the legs of the structure can be easily extended by installing the jacket structure on the underwater ground and then extending the legs of the structure. The structure can be constructed, and the footing made of concrete or the like becomes unnecessary, so that the size and weight of the jacket structure can be reduced and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a front view of a pier constructed by a jacket structure according to an embodiment of the present invention.

FIG. 2 is a side view of a pier constructed by a jacket structure.

FIG. 3 is a plan view of a jacket structure.

FIG. 4 is a schematic view illustrating a transport operation of the jacket structure as a bridge pier construction operation using the jacket structure.

FIG. 5 is a schematic view showing a pile driving operation as a pier construction operation using a jacket structure.

FIG. 6 is a schematic diagram illustrating a pier extension operation as a pier construction operation using a jacket structure.

FIG. 7 is a schematic view of a pier constructed by a conventional pile foundation.

FIG. 8 is a schematic view of a pier constructed from a conventional caisson foundation.

FIG. 9 is a schematic view of a pier constructed with a jacket-type foundation.

[Explanation of symbols]

 Reference Signs List 11 jacket structure 12 connecting member 13 pile guide member 14 ballast tank 15 insertion pipe 16 pile 41 underwater ground 42 soft ground 43 supporting ground 51 bridge pier (structure) 51a bridge pier lower part

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshihiro Oishi 2-1-1, Shinhama, Arai-machi, Takasago City, Hyogo Prefecture Inside the Takasago Research Laboratory, Mitsubishi Heavy Industries, Ltd. No. 1-1, Kobe Shipyard, Mitsubishi Heavy Industries, Ltd. (72) Inventor Yasuyuki Tanji 1-1-1, Wadazakicho, Hyogo-ku, Kobe, Hyogo Prefecture, Japan Inside Kobe Shipyard, Mitsubishi Heavy Industries, Ltd. 1-1-1 Wadazakicho, Hyogo-ku, Kobe-shi Mitsubishi Heavy Industries, Ltd.Kobe Shipyard (72) Inventor Hiroyuki Kamei 1-1-1, Wadazakicho, Hyogo-ku, Hyogo-ku, Kobe-shi, Hyogo 72) Inventor Takeshi Ushio 7-14, Wadamiya-dori, Hyogo-ku, Kobe-shi, Hyogo Pref.

Claims (2)

[Claims] 1. A jacket structure for constructing a structure by installing it on a submarine ground, wherein a plurality of pile guide members are connected by a connecting member, and a ballast tank is mounted at a central portion. . 2. The jacket structure according to claim 1, wherein legs of the structure are provided integrally.