JP2000017644A - Installation method of underwater structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an installation method capable of shortening an installation period and simplifying an initial stable measure by inserting the fixing embedment part of an underwater structure into an installation hole excavated in a water bottom and injecting a solidifying agent for foot protection. SOLUTION: An erection working base is constructed on a planned jobsite to excavate installation holes 21 in a water bottom 2, and an underwater guide forming a taper face so as to be lowered toward the installation hole 21 is arranged on the periphery of the opening part of each installation hole 21. A jacket 5 is composed so as to make steel pipes and steel materials framework structure, and each leg 51 is composed of a pile single body. The jacket 5 assembled on a land is transported on water to be installed on the water bottom 2, a solidifying agent 10 such as concrete is placed in the installation hole 21 for foot protection. An installation leg part integrally providing a plurality of the legs projected downward on a concrete-made bottom board may be integrally mounted. Thereby the jacket is made lightweight, a large-sized working ship for transportation on water is made unnecessary, and jobsite working hours can be shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for installing an underwater structure.

[0002]

2. Description of the Related Art Pile foundations and jacket foundations are known as underwater foundations for constructing structures on water. The pile foundation has a structure in which the pile penetrates into the water floor by hitting and the pile is fixed by the adhesive force with the ground. As shown in FIG. 11, the jacket foundation is formed by inserting a middle pile b into an outer pile a and hitting it with a hammer or the like, or excavating from the outer pile when it is difficult to penetrate the pile by hitting. The pile will be penetrated by using an auxiliary construction method such as a pile or a weight, and in some cases, it will be a triple pipe structure (pin pile). In addition, the outer pile of the jacket foundation described above needs to be hollow and have a uniform cross section, because the bottom of the water is excavated from the inside by a known excavator.

[0003]

The construction of the pile foundation described above has the following problems. In the case of construction on hard ground, it is difficult to penetrate the pile by hitting which is usually adopted, and a known auxiliary construction method is required. The construction of the jacket foundation has the following problems. Jackets and the like lack stability against external forces until the completion of pile driving, so that initial stability measures are required, and the time required for on-site work for pile driving is prolonged. As shown in FIG. 12, since the water bottom is excavated from the inside of the outer pile a, reinforcement of the point c cannot be performed from the inside of the outer pile a but hitting the point c to reinforce the point c. It is necessary to form a thickened reinforcing portion d outside the outer pile a at a predetermined position of the outer pile a. Therefore, all points c of the outer pile a
If this structure is adopted, the jacket becomes heavy.

The present invention has been made to solve the above problems, and an object of the present invention is to make it possible to shorten the installation period of underwater structures, and in particular, to shorten the period during initial stability measures. An object of the present invention is to provide a method for installing an underwater structure.

[0005]

SUMMARY OF THE INVENTION According to the present invention, an installation hole is excavated in a water bottom, an anchoring portion of an underwater structure is inserted into the installation hole, and a solidifying material is inserted between the anchoring portion and the installation hole. This is a method for installing an underwater structure, characterized by injecting and solidifying. Further, the present invention is the method for installing an underwater structure, wherein the anchoring portion is constituted by a single pile in the above-described method for installing an underwater structure. Further, the present invention is a method for installing an underwater structure, characterized in that in the above-described method for installing an underwater structure, the fixing root portion is formed to protrude from the bottom surface of the bottom plate of the underwater structure. The present invention also provides
The method for installing an underwater structure according to any one of the above-described methods for installing an underwater structure, wherein an underwater guide having a tapered surface descending toward the installation hole is disposed around an entrance of the installation hole. . Furthermore, the present invention, in any of the above-described method of installing an underwater structure, a pedestal whose installation height is adjusted on the underwater structure is arranged on the underwater surface, and the underwater structure is installed on the pedestal. This is a method for installing an underwater structure.

[0006]

[Embodiment 1] An example of a method for installing an underwater structure according to the present invention will be described below.

<A> Excavation of Installation Hole As shown in FIG. 2, a known temporary work table 1 is constructed on the water at the site where the underwater structure is to be installed, and the bottom is excavated from the temporary work table 1. First, a pipe 3 serving as a guide for a drilling machine is made to reach from the temporary work table 1 to the water bottom 2, and this pipe 3
The drilling machine 4 is arranged inside the inside, and the installation hole 21 is excavated in the water bottom 2. At this time, it is conceivable to employ a known EM machine or a reverse machine as the drilling machine 4. The installation holes 21 are constructed at the intervals at which the legs 51 are arranged by the number of the legs 51 which are root fixing portions of the jacket 5 to be described later by the above-described method.

<B> Arrangement of Underwater Guide Around the openings of the installation holes 21 of the water bottom 2, as shown in FIG. 3, there is provided an underwater guide 6 which serves as a guide when the legs 51 of the jacket 5 are inserted. Deploy. The underwater guide 6 is a member having a tapered surface 61 formed so as to descend toward the installation hole 21. In addition, the shape and arrangement position of the underwater guide 6 can be appropriately changed within a range having the above-described functions.

<C> Arrangement of Installation Base Around each opening of the installation hole 21 of the water bottom 2, an installation base 7 for installing the jacket 5 in a stable state may be arranged as shown in FIG. Conceivable. The mounting base 7 is
It is a member for adjusting and supporting the height of the installation so that the jacket 5 itself in which each leg 51 is inserted into the installation hole 21 is installed, for example, without being inclined, and is disposed between the installation holes 21 as shown in FIG. It is possible to do. In addition, the shape and arrangement position of the mounting base 7 can be appropriately changed within a range having the above-described functions.

<D> Jacket Structure As the jacket 5 used in the present invention, as shown in FIG. 1, a steel pipe or a steel material (not shown) may be constructed to have a frame structure. It is conceivable that each leg 51 of the jacket 5 which is a root fixing part is constituted by a single pile.

<E> Installation of Jacket In accordance with the completion of drilling of the water bottom 2, the jacket 5 assembled on land is transported to the site by water transport, and the jacket 5 is installed.
Is installed on the water bottom 2. As shown in FIG.
Is suspended by a known crane ship 8 or a hoist ship and submerged in the water bottom 2. Since the underwater guides 6 are arranged around the opening of the installation hole 21, each leg 51, which is a fixing root portion of the jacket 5, is easily installed by the tapered surface 61 of the underwater guide 6 shown in FIG. It is inserted into the hole 21.

<F> Rooting of Jacket As shown in FIG. 5, rooting of the jacket 5 installed on the water bottom 2 is performed. At this time, for example, a concrete block 9 or the like is installed on the jacket 5 as an initial stabilization measure, or an iron column 91 is arranged in the jacket 5 to increase the weight of the jacket 5 and counter the external force such as wave force. It is possible. As shown in FIGS. 5 and 6, the roots of the jacket 5 are fixed by pulling a hose 82 from a known concrete plant ship 81 or the like into the installation hole 21 into which each leg 51 is inserted, and placing a solidified material 10 such as concrete. Do it. An outer peripheral surface of each leg 51 of the jacket 5 is provided with, for example, a projection (not shown) or a wavy shape (not shown) to increase a contact surface with the solidified material 10 to fix the solidified material 10. It is conceivable to improve the performance.

[0013]

Second Embodiment In the first embodiment of the present invention, an example has been described in which the leg 51 which is the anchoring portion of the jacket 5 is constituted by a single pile which is the leg of the jacket 5. In the present embodiment, an example will be described in which a bottom plate is provided on a jacket and a fixing root portion is provided so as to protrude from the bottom surface of the bottom plate. As shown in FIG. 7, an installation leg 53 is integrally attached to the bottom of the jacket 52. Mounting leg 53
The bottom plate 531 is a ballast of the jacket 52. The bottom plate 531 is made of, for example, concrete, and a plurality of legs 532, which are integrally formed with the bottom plate 531 and are protruding downward from the bottom surface of the bottom plate 531. Leg 532
Four may be provided as shown in FIG. 7, or five or more may be provided as needed. Then, the jacket 52 is installed in the excavated installation hole in accordance with the position of the leg 532 of the installation leg 53, and the installation hole is filled with a solidifying material and solidified.
As described above, the jacket 52 can obtain the effect of the gravity type by the bottom plate 531 described above, and also can obtain the effect of fixing each leg 532 to the ground.

In this embodiment, an underwater guide is provided around the opening of the installation groove, an installation base is provided, and a projection (not shown) is provided on the outer peripheral surface of the leg 532. Forming is the same as in the first embodiment. It is also conceivable to improve the gravity-type installation effect by constructing a layer of concrete or the like that becomes a ballast on the upper surface of the installation leg 53 at the same time as the rooting of the jacket 52.

[0015]

[Embodiment 3] The jacket used in the method for installing an underwater structure according to the present invention does not excavate from the inside of the outer pile of the jacket, so that the outer pile must be formed straight to the water bottom as shown in FIG. Absent. Therefore, a multi-section jacket 5 as shown in FIG. 1 or a curved jacket 5 as shown in FIG.
4, etc., the jacket can be of various shapes.

[0016]

[Fourth Embodiment] Further, as described above, since the excavation is not performed from the inside of the outer pile, it is possible to reinforce the inside of the outer pile even when reinforcing the point portion of the jacket. This makes it possible to perform a lightweight and reliable reinforcing work as compared with the conventional method of increasing the thickness of the outer pile. As an example of the reinforcing work, a method of arranging the reinforcing material 55 inside the outer pile as shown in FIG. 9 to reinforce or a frame type jacket as shown in FIG. A method using the connecting structure 56 is conceivable.

[0017]

Fifth Embodiment In each of the first to fourth embodiments described above, by forming a basic footing at the fixing root portion of each form of the jacket, the effects of both the fixing structure by the rooting and the gravity type structure can be obtained. It is also possible to get.

[0018]

As described above, the present invention has the following effects. <B> Unlike the conventional double or triple structure of the jacket foundation, the superstructure is framed and lightweight. Furthermore, since it is possible to provide reinforcement inside the pile, it is not necessary to make the pile thicker to reinforce the point, so the jacket is lighter and a large workboat is not required for water transport etc. . <B> Installation work is completed only by installing a frame structure and solidifying it, so that the on-site work period becomes very short. <C> Since the on-site work period can be shortened, initial stability measures can be made by a simple method. <D> By attaching the installation legs to the bottom of the jacket, a gravity type installation effect can be obtained. <E> By providing a basic footing on each leg of the jacket to be laid and a portion corresponding thereto, it is possible to implement an installation method having both advantages of the fixing structure and the gravity type. <F> Since the outer pile is not excavated from the inside of the outer pile, the outer pile does not need to be formed straight to the water bottom, and the jacket can be formed in various shapes.

[Brief description of the drawings]

FIG. 1 is a side view of a jacket installed by an underwater structure installation method.

FIG. 2 is an explanatory view at the time of excavating a mounting hole according to the first embodiment.

FIG. 3 is a top view of a water bottom on which the jacket according to the first embodiment is installed.

FIG. 4 is an explanatory view when the jacket according to the first embodiment is installed.

FIG. 5 is an explanatory view when the jacket is consolidated according to the first embodiment.

6 is an enlarged view of VI in FIG.

FIG. 7 is an explanatory view of an installation leg according to the second embodiment.

FIG. 8 is a side view of the curved jacket according to the third embodiment.

FIG. 9 is a longitudinal sectional view 1 of a point portion according to the third embodiment.

FIG. 10 is a longitudinal sectional view 2 of a point portion according to the third embodiment.

FIG. 11 is an explanatory view of a conventional jacket installation operation.

FIG. 12 is a vertical cross-sectional view of a point portion of a conventional jacket.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Takayoshi Tsunoya, Inventor, Takayoshi Kazuya 3-2-2 Nakanoshima, Kita-ku, Osaka-shi Kansai Electric Power Co., Inc. (72) Inventor Kiyoshi Nishimoto 3-chome, Nakanoshima, Kita-ku, Osaka, Osaka 22 Kansai Electric Power Co., Inc. (72) Inventor Ryuji Noda 3-3-1 Nakanoshima, Kita-ku, Osaka-shi, Osaka Prefecture 22-Kansai Electric Power Co., Ltd. (72) Koichi Ota 3-3-1, Nakanoshima, Kita-ku, Osaka, Osaka 22 Kansai Electric Power Co., Inc. (72) Inventor Masayoshi Matsukida 1-25-1, Nishi Shinjuku, Shinjuku-ku, Tokyo Taisei Construction Co., Ltd. (72) Inventor Kiyomi Ueno 1-25-1, Nishi-Shinjuku, Shinjuku-ku, Tokyo No. Taisei Construction Co., Ltd. (72) Inventor Norihiro Akisato 25-1, Nishi-Shinjuku, Shinjuku-ku, Tokyo Inside Taisei Construction Co., Ltd. (72) Inventor Kazuhiro Murayama, Shinjuku-ku, Tokyo Chome 25th No. 1 Taisei Construction Co., Ltd. inn

Claims (5)

[Claims] An excavation hole is drilled in a water bottom, an anchoring portion of an underwater structure is inserted into the installation hole, and a solidifying material is injected between the anchoring portion and the installation hole to consolidate the soil. Characteristic, installation method of underwater structures. 2. The method for installing an underwater structure according to claim 1, wherein the anchoring portion is formed by a single pile. 3. The installation method for an underwater structure according to claim 1, wherein the anchoring portion is configured to protrude from a bottom surface of a bottom plate of the underwater structure.
How to install underwater structures. 4. The underwater structure installation method according to claim 1, wherein an underwater guide having a tapered surface descending toward the installation hole is arranged around the entrance of the installation hole. A method for installing an underwater structure, characterized in that: 5. The underwater structure installation method according to claim 1, wherein a pedestal whose installation height of the underwater structure is adjusted is arranged on the underwater surface, and the underwater structure is mounted on the pedestal. A method for installing an underwater structure, comprising installing an object.