JP2002088779A - Jacket structure and method for setting jacket structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a jacket structure which facilitates sheathing and connecting work of a pile guide member forming the jacket structure onto a pile driven into the subaqueous ground, in a short time, to thereby improve the efficiency of setting work of the jacket structure, and to provide a method for setting the jacket structure. SOLUTION: The plurality of pile guide members 13 and 14 are connected together in one body by means of joint members 12 to construct the jacket structure 11, and a plurality of installation pieces 51 are circumferentially installed on an internal peripheral surface of a lower portion of each pile guide member 13, as a guide means for guiding an upper end of a straight pile 19 having been driven into the subaqueous ground G into the pile guide member 13. Each installation piece 51 has a bearing portion 51c at which a guide portion 5b having been bent from an installation portion 51a in an upper inward direction, is fitted onto an upper end of the straight pile 19, and the installation piece 51 is radially movable by means of an adjusting bolt 52.

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 the underwater ground when constructing a structure such as a pier standing on the water, and to install this jacket structure on the underwater ground. Regarding the installation method.

[0002]

2. Description of the Related Art In general, direct foundations, cast-in-place pile foundations, steel pipe pile foundations, caisson foundations and the like are conventionally known as bridge foundations. For example, in a pier constructed with pile foundations, multiple piles penetrate the soft ground of the submarine ground and are driven into the supporting ground, a footing is constructed with reinforced concrete on each pile, and a pier is mounted on this footing. The pier is erected, and the pier is connected to an anchor frame previously embedded in the footing by an anchor bolt. In addition, in the pier constructed by the caisson foundation, the support ground on the sea floor is leveled by a predetermined area, and a caisson with concrete poured inside is installed on this ground leveling ground,
A pier is erected on the caisson, and the pier is connected to an anchor frame previously embedded in the caisson by an anchor bolt.

However, in the case of such a pile foundation, there is a problem 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 foundations, there is no problem if the seabed is at a depth of about several tens of meters, but if it is deeper than the seabed, large-scale offshore work is required to form the ground level, and high cost is required. Therefore, there is a problem in that the construction period becomes longer, the route must be restricted during that time, and furthermore, if there is soft ground above the supporting ground, ground improvement work will also be required.

In view of the above, construction of footings made of reinforced concrete on the seabed or the need to install a caisson in which concrete is cast inside is unnecessary, thereby facilitating construction work and reducing costs. There is a technology using a jacket-type foundation. FIG. 10 schematically shows a pier constructed with a conventional jacket-type foundation.

In a pier constructed by a conventional jacket-type foundation, as shown in FIG.
A jacket structure 004 composed of a number of guide pipes 002 connected by a connecting member 003 to 001 is installed, and each guide pipe 002 is driven by a pile driver (not shown).
Are used to drive a plurality of piles 005 into the support ground 001. A footing 006 is constructed on the jacket structure 004 by reinforced concrete. An anchor bolt 007 and an anchor frame 008 are embedded in the footing 006 in advance, and a pier 009 is erected and joined on the footing 006.

[0006] Such a technique is disclosed in, for example, Japanese Patent Application Laid-Open No. 61-57721, entitled "Method of Underwater Foundation Construction with Multipile Jacket Structure".

[0007]

In the case of the above-mentioned conventional jacket-type foundation, the jacket structure 004 is constituted by connecting a number of guide pipes 002 by connecting members 003,
Each guide pipe 002 is fixed to the supporting ground 001 using a pile 005. In this case, a plurality of straight piles 005 are previously set on a predetermined supporting ground 001 on which the jacket structure 004 is installed, and the jacket structure 004 is settled for each of the straight piles 005. After positioning the horizontal direction by inserting the lower end of the vertical guide pipe 002 corresponding to the upper end of the guide pipe 002, after joining the lower part of the guide pipe 002 and the upper part of the straight pile 005 at a predetermined height position, In addition, the inclined structure 004 is installed on the supporting ground 001 by driving and connecting the inclined pile 005 to the supporting ground 001 using the inclined guide pipe 002.

However, it is difficult to simultaneously insert each guide pipe 002 into a plurality of straight piles 005 while submerging the jacket structure 004 in water using a large crane ship. And workability is not good. In addition, when the straight pile 005 placed at a predetermined position on the support ground 001 is displaced, it becomes difficult to insert the guide pipe 002 into the straight pile 005.

The present invention is intended to solve such a problem, and can easily and quickly insert and connect a pile guide member constituting a jacket structure to a pile driven into the underwater ground. An object of the present invention is to provide a jacket structure and an installation method of the jacket structure, which improve the workability of the installation work of the jacket structure.

[0010]

According to a first aspect of the present invention, there is provided a jacket structure for constructing a structure by installing the structure on an underwater ground.
A plurality of pile guide members are connected by a connecting member, and a guide means for guiding an upper end of a pile driven into the underwater ground into the pile guide member is provided below the pile guide member. It is.

Further, in the jacket structure according to the second aspect of the present invention, the guide means has a fitting portion with which an upper end of the pile is fitted.

Further, in the jacket structure according to the third aspect of the present invention, the guide means is a plurality of radially movable attachment pieces provided along a circumferential direction on a lower inner peripheral surface of the pile guide member. It is characterized by:

Further, in the jacket structure according to the present invention, the plurality of mounting pieces can be moved radially inward of the pile guide member by bolts so as to hold the upper end of the pile. And

Further, in the jacket structure according to the invention of claim 5, the guide means is a skirt member fixed to a lower end of the pile guide member and having a diameter larger than an outer diameter of the pile guide member. Features.

According to a sixth aspect of the present invention, in the jacket structure, the guide means is an adjust ring provided inside the lower portion of the pile guide member and expandable and contractable by a bolt.

Further, in the jacket structure according to the present invention, the guide means may be a plurality of support ribs along the axial direction fixed along the circumferential direction on the inner peripheral surface at the lower end portion of the pile guide member. It is characterized by.

According to the eighth aspect of the present invention, there is provided a method for installing a jacket structure, wherein a plurality of cylindrical pile guide members are integrally connected by a connecting member, and the jacket structure is cast at a predetermined position on the underwater ground. The plurality of piles are lowered, and the upper end of the pile is guided into the pile guide member by guide means provided at a lower portion of the pile guide member, and is fitted thereto. The lower part of the guide member and the upper part of the pile are coupled to fix the jacket structure to the underwater ground.

[0018]

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

FIG. 1 schematically shows a pier constructed by the method for installing a jacket structure according to the first embodiment of the present invention.
FIG. 2 schematically illustrates the jacket structure according to the present embodiment, FIG. 3 schematically illustrates a joint between the pile guide member and the straight pile, and FIGS. 4 and 5.
FIG. 6 shows an outline of a pier construction operation using the installation method of the jacket structure, and FIG. 6 shows an outline of an operation of inserting and connecting a pile guide member to a straight pile.

As shown in FIG. 1, the jacket structure 11 of the present embodiment is installed on a not-shown underwater ground composed of an upper soft ground and a lower supporting ground, and is provided with a bridge girder 31 as a structure. It is for constructing the pier 32. That is, the jacket structure 11 is
Pile guide members (legs) 13, connected by
14 and a hollow footing 15 attached to the upper end gathering portion of each of the pile guide members 13, 14.

The jacket structure 11 will be described in detail. As shown in FIGS.
5 is an upper steel plate 16, a lower steel plate (not shown), and four outer steel plates 1
8, the upper ends of the four pile guide members 13 for straight piles penetrate near the center and the upper ends of four pile guide members 14 for slant piles penetrate outside. are doing. The pile guide members 13 and 14 have a cylindrical shape with a predetermined length, and the pile guide member 1 is
4 has a lower portion extending outward, and each pile guide member 13,
The fourteen members are integrally connected by a plurality of connecting members 12. The guide member 13 is connected to the jacket structure 11.
Is placed on a straight pile 19 previously placed on the underwater ground to position it in the horizontal direction when it is placed on the underwater ground. On the other hand, the guide member 14 is used for positioning the jacket structure 11. After the is positioned on the underwater ground, the slant pile 20 is driven into the underwater ground as a guide.

The upper end of each of the pile guide members 13 and 14 penetrates the upper steel plate 16 and the lower steel plate of the footing 15 and opens upward. Inside the footing 15, a plurality of vertical beam members (not shown) are provided. Arranged in a lattice pattern, pile guide member 1
3 and 14 are connected and supported on the inner surface of the footing 15. The lower part of the pier 32 penetrates into the footing 15 and is connected and supported by a vertical beam member (not shown).
The pier 32 will be erected from 5 upward.
In addition, when this jacket structure 11 is installed on the underwater ground, the footing 15 is configured to be located in the splash zone, and the outer peripheral portion of the footing 15 is subjected to anticorrosion treatment. For example, a high corrosion-resistant metal such as a titanium alloy is fixed on the surface, or a sacrificial steel plate is fixed via coated concrete.

When the jacket structure 11 is installed, as described above, the pile guide member 13 is inserted into the straight pile 19 previously set in the underwater ground to perform horizontal positioning. Since it is difficult to simultaneously insert the respective pile guide members 13 into the plurality of straight piles 19 while the body 11 is settling in the water, the work of inserting the pile guide members 13 into the straight piles 19 can be easily performed. A straight pile 1 placed on the underwater ground below each pile guide member 13
Guide means for guiding the upper end of the pile 9 into the pile guide member 13 is provided.

That is, as shown in FIG.
A plurality (four in this embodiment) of mounting pieces 51 are attached to the lower portion of the inner peripheral surface 3 along the circumferential direction on the inner peripheral surface as guide means. The mounting piece 51 has a lower end mounting portion 51a fixed to the inner peripheral surface of the pile guide member 13 by welding, and an upper end portion of the straight pile 19 via a guide portion 51b bent upward and inward from the mounting portion 51a. Support portion 5 as a fitting portion where
1c is integrally formed, and the support portion 51c is movable in the radial direction of the pile guide member 13 by the elastic force of the mounting piece 51 itself. An adjusting bolt 52 is screwed into the pile guide member 13 from the outside corresponding to the mounting piece 51, and the tip of the adjusting bolt 52 is in contact with the support portion 51c. Accordingly, when each of the adjustment bolts 52 is loosened (moved outward), each of the mounting pieces 51 is moved outward by the elastic force, and is inserted into the space formed inside each of the support portions 51c.
When the adjustment bolts 52 are tightened (moved inward), the mounting pieces 51 are pressed and moved inward, and the support portions 51c hold the upper end of the straight pile 19. It is possible.

Here, the construction method of the bridge girder 31 and the pier 32 using the above-described jacket structure 11 will be described with reference to FIG.
This will be described with reference to FIGS.

As shown in FIG. 4 (a), the jacket structure 11 is manufactured at a dock 41 in a predetermined factory. When the manufacture is completed, seawater is put into the dock 41 and the jacket structure 11 is raised. Let it. On the other hand, as shown in FIG.
Of the plurality of straight piles 19 from the pile driving
Is installed. Then, as shown in FIG. 4 (c), the jacket structure 11 obtains buoyancy by the footing 15 having a hollow shape, and supplies (pressurizes) pressurized air into the respective pile guide members 13 and 14 from the upper end. With the buoyancy, the jacket structure 11 is floated on the sea 42 to balance the whole, towed by the pair of front and rear tugboats 43, and transported to the installation location.

When the jacket structure 11 is towed to the installation location, as shown in FIG.
14, the jacket structure 11 is sunk while maintaining the balance of the jacket structure 11, and each pile guide member 13 is inserted into a plurality of straight piles 19 already set in the underwater ground G, thereby forming the jacket structure 11. The body 11 is positioned in the horizontal direction and settles to a predetermined depth. At this time, as shown in FIG. 6A, when the pile guide member 13 is lowered with respect to the straight pile 19, the upper end of the straight pile 19 is inserted into the pile guide member 13 and each mounting piece 51 While being guided by the guide portion 51b, the support portion 51c can be loosely fitted in the inner space portion of each support portion 51c. When the diver fastens each adjustment bolt 52 from the outside at a predetermined lowering position of the pile guide member 13, FIG.
(b) As shown in (c), each support part 51c is pressed and moves inward, and the pile guide member 13 and the straight pile 19 are joined by sandwiching the upper end of the straight pile 19, thereby forming a jacket. Structure 1
1 can be positioned on the underwater ground G. In addition, by changing the fastening amount (movement amount) of each adjustment bolt 52,
The connection position of the pile guide member 13 with respect to the straight pile 19 in the horizontal direction can be adjusted.

When the jacket structure 11 is positioned at a predetermined position on the underwater ground G in this way, as shown in FIG. 5B, a pile driving hammer 44 mounted on the upper portion of the jacket structure 11 is used. The slant pile 20 is inserted into the pile guide member 14 of the jacket structure 11 and the pile hammer 4
The slant pile 20 is driven into the underwater ground G by 4 and both are connected and fixed by welding or the like. Thus, the existing straight pile 1
9 and the pile guide member 13 is inserted and coupled,
When the slanted pile 20 is driven into the underwater ground G via the pile guide member 14 and coupled therewith, seawater and earth and sand in each of the pile guide members 13 and 14 and each of the piles 19 and 20 are discharged, and then concrete is introduced into the inside. The jacket structure 1
1 can be fixed to the underwater ground G.

Then, the pile guide members 13, 14 and the pile 1
Jacket structure 11 to underwater ground G using 9, 20
When the installation work of the bridge girder is completed, as shown in FIG.
To build.

As described above, in the installation work of the jacket structure 11 of the present embodiment, the jacket structure 11 is constructed by integrally connecting the plurality of pile guide members 13 and 14 having a cylindrical shape by the connection member 12. At the lower part of the pile guide member 13, a plurality of attachments are provided along the circumferential direction on the inner peripheral surface as guide means for guiding the upper end of the straight pile 19 already installed on the underwater ground G into the pile guide member 13. A piece 51 is mounted, and a guide part 51b bent upward and inward from the mounting part 51a and a support part 51c to which the upper end of the straight pile 19 is fitted are formed on the mounting piece 51, and the adjusting bolt 52 is used to adjust the radial direction. It is possible to move.

Therefore, when the jacket structure 11 is settled, the upper end of the existing straight pile 19 is inserted into the pile guide member 13 while being guided by the guide portion 51b of each mounting piece 51, and the predetermined position of the pile guide member 13 is determined. By tightening the adjusting bolts 52 at the lower position, each support portion 51c moves inward to clamp the upper end of the straight pile 19, and connects the pile guide member 13 and the straight pile 19 to form a jacket structure. Body 11 underwater ground G
, And as a result, the workability of the installation work of the jacket structure can be improved.

In the above-described embodiment, the footing 15 of the jacket structure 11 is formed in a rectangular box shape. However, the shape is not limited to a hollow box shape, and may be a circular box shape. Also, as shown in detail in FIG. 1, two jacket structures 11 are installed side by side,
Although the bridge-shaped pier 32 is supported, a single jacket structure 11 may be provided to support the I-shaped pier.

FIG. 7 is a schematic diagram showing an operation of inserting and connecting a pile guide member to a straight pile according to a method for installing a jacket structure according to a second embodiment of the present invention, and FIG. 8 is a jacket structure according to a third embodiment of the present invention. FIG. 9 is a schematic diagram illustrating an operation of inserting and coupling a pile guide member to a straight pile according to a method of installing a body, and FIG. 9 illustrates an operation of inserting and coupling a pile guide member to a straight pile according to a method of installing a jacket structure according to a fourth embodiment of the present invention. An outline is shown. Note that members having the same functions as those described in the above-described embodiment are denoted by the same reference numerals, and redundant description will be omitted.

In the second embodiment, as shown in FIG. 7, a skirt member 61 is mounted at the lower end of the pile guide member 13 as a guide means. This skirt member 61
Is a cylindrical supporting portion 61a as a fitting portion having substantially the same diameter as the outer diameter of the straight pile 19, and a guide having a conical shape larger than the outer diameter of the pile guide member 13 from the lower end of the supporting portion 61a. The guide portion 61b is fixed to the lower end portion of the pile guide member 13 by welding.

Therefore, the pile guide member 1 is
3, while the upper end of the straight pile 19 is guided by the guide 61 b of the skirt member 61,
a, and by connecting the pile guide member 13 (skirt member 61) and the straight pile 19 at a predetermined lower position of the pile guide member 13, the jacket structure 11 can be positioned on the underwater ground G. it can.

As described above, in this embodiment, even if the existing straight pile 19 and the pile guide member 13 are largely displaced in the horizontal direction, the pile guide member 13 can be easily moved by the skirt member 61. Can be inserted.

In the third embodiment, as shown in FIG. 8, an adjust ring 71 is attached to the lower end of the pile guide member 13 as guide means. The adjust ring 71 is a ring having a diameter slightly larger than the outer diameter of the straight pile 19, a plurality of adjustment bolts 72 are screwed from the inner side, and a tip end thereof is in contact with the inner peripheral surface of the pile guide member 13. .

Therefore, the pile guide member 1 can be
3, the upper end of the straight pile 19 is inserted from the lower end of the pile guide member 13, and the adjust ring 71 is further inserted.
When the adjusting bolt 72 is fastened at a predetermined lower position of the pile guide member 13, the inner diameter of the adjust ring 71 is reduced, and the outer peripheral surface of the straight pile 19 is clamped. By combining with the stake 19,
The jacket structure 11 can be positioned on the underwater ground G.

As described above, in the present embodiment, the worker guides the pile guide member 13 and the straight pile 1 inside the pile guide member 13.
9 to supply air from the upper end portion of the pile guide member 13 and discharge seawater from the lower end portion, so that the worker becomes a work in a working space under atmospheric pressure, and the working environment is reduced. Can be improved.

Further, in the fourth embodiment, as shown in FIG. 9, at the lower end of the pile guide member 13, a plurality of support ribs 81 are provided along the axial direction on the inner peripheral surface thereof as guide means along the circumferential direction. Guide part 8 fixed at the lower end
1a is formed. A hollow seal rubber ring 82 is mounted on the support rib 81, and an on-off valve 84 and a hydraulic pump 85 are connected to the seal rubber ring 82 via a hose 83.

Therefore, the pile guide member 1 is
3, the upper end of the straight pile 19 is attached to each support rib 8.
While being guided by the first guide portion 81a, the pile guide member 13 is inserted into the pile guide member 13. At a predetermined lower position of the pile guide member 13, the on-off valve 84 is opened, and the seal rubber ring is opened from the hydraulic pump 85 via the hose 83. When air is supplied to and inflated 82, the pile guide member 13 and the straight pile 19 are tightly sealed. Thereafter, by discharging the seawater in the pile guide member 13 and supplying grout, the pile guide member 13 and the straight pile 19 are connected, and the jacket structure 11 can be positioned on the underwater ground G.

As described above, in the present embodiment, the worker can perform the fastening work between the pile guide member 13 and the straight pile 19 without entering the inside of the pile guide member 13, thereby improving workability. it can.

In each of the above embodiments, a plurality of mounting pieces 51 and adjustment bolts 52, a skirt member 61, an adjust ring 71 and an adjustment bolt 72 as guide means,
Although the support ribs 81 are applied, they may be used in combination, and the present invention is not limited to these structures.

[0044]

As described in detail in the above embodiment, according to the jacket structure of the first aspect of the present invention, a plurality of pile guide members are connected by the connecting member.
Since a guide means for guiding the upper end of the pile driven into the underwater ground into the pile guide member is provided below the pile guide member,
When the jacket structure is settled, the upper end of the existing pile is guided by the guide means and inserted into the pile guide member, and the pile guide member constituting the jacket structure for the pile driven into the underwater ground By easily performing the insertion and coupling work in a short time, the workability of the installation work of the jacket structure can be improved.

According to the jacket structure of the second aspect of the present invention, since the guide means is provided with the fitting portion to which the upper end of the pile is fitted, the position of the pile guide member with respect to the existing pile is easily regulated. Accordingly, the joining operation between the jacket structure and the pile can be easily performed in a short time.

According to the jacket structure of the third aspect of the present invention, the guide means is a plurality of radially movable mounting pieces provided along the circumferential direction on the lower inner peripheral surface of the pile guide member. The work of inserting and positioning the pile guide member into the pile driven into the underwater ground can be easily performed.

According to the jacket structure of the fourth aspect of the present invention, since the plurality of mounting pieces are moved inward in the radial direction of the pile guide member by the bolts, the upper end of the pile can be clamped.
The work of adjusting the position of the pile guide member with respect to the existing pile can be easily and accurately performed.

According to the jacket structure of the fifth aspect of the present invention, since the guide means is fixed to the lower end of the pile guide member and is a skirt member whose diameter is larger than the outer diameter of the pile guide member, the existing skirt member is provided. Even if the pile and the pile guide member are largely displaced in the horizontal direction, the pile guide member can be easily inserted into the pile by the skirt member.

According to the jacket structure of the sixth aspect of the present invention, since the guide means is an adjuster ring provided inside the lower portion of the pile guide member and can be expanded and contracted by bolts, an operator can work inside the pile guide member. The work environment can be improved by performing the fastening work with the pile.

According to the jacket structure of the seventh aspect of the present invention, the guide means is a plurality of support ribs along the axial direction fixed along the circumferential direction on the inner peripheral surface of the lower end portion of the pile guide member. With such a configuration, the work of inserting and positioning the pile guide member into the existing pile can be easily performed.

Further, according to the jacket structure installation method of the invention, the jacket structure in which the plurality of cylindrical pile guide members are integrally connected by the connecting member is placed at a predetermined position on the underwater ground. The pile is lowered with respect to the plurality of cast piles, and the upper end of the pile is guided into the pile guide member by the guide means provided at the lower part of the pile guide member, and is fitted. By connecting the lower part of the pile and the upper part of the pile, the jacket structure is fixed to the underwater ground. By easily performing the operation in a short time, the workability of the installation work of the jacket structure can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic view of a pier constructed by a method for installing a jacket structure according to a first embodiment of the present invention.

FIG. 2 is a schematic view of a jacket structure according to the embodiment.

FIG. 3 is a schematic diagram showing a joint between a pile guide member and a straight pile.

FIG. 4 is a schematic diagram showing a construction work of a pier using an installation method of a jacket structure.

FIG. 5 is a schematic view illustrating a construction work of a pier using an installation method of a jacket structure.

FIG. 6 is a schematic view showing an operation of inserting and connecting a pile guide member to a straight pile.

FIG. 7 is a schematic view illustrating an operation of inserting and connecting a pile guide member to a straight pile by a method for installing a jacket structure according to a second embodiment of the present invention.

FIG. 8 is a schematic view illustrating an operation of inserting and connecting a pile guide member to a straight pile by a method for installing a jacket structure according to a third embodiment of the present invention.

FIG. 9 is a schematic view illustrating an operation of inserting and connecting a pile guide member to a straight pile by a method for installing a jacket structure according to a fourth embodiment of the present invention.

FIG. 10 is a schematic view of a pier constructed by a conventional jacket-type foundation.

[Explanation of symbols]

 Reference Signs List 11 jacket structure 12 connecting member 13, 14 pile guide member 15 footing 19 straight pile 20 inclined pile 31 bridge girder 32 pier (structure) 41 dock 42 marine 43 tugboat 51 mounting piece (guide means) 51a mounting section 51b guide section 51c support Part (fitting part) 52 Adjusting bolt 61 Skirt member (guide means) 61a Support part (fitting part) 61b Guide part 71 Adjust ring 72 Adjusting bolt 81 Support rib 81 (guide means) 81a Guide part G Underwater ground (support ground) )

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Akinobu Kishi 1-1-1 Wadazakicho, Hyogo-ku, Kobe-shi, Hyogo F-term in Mitsubishi Heavy Industries, Ltd. Kobe Shipyard 2D046 CA07 DA03 DA62

Claims (8)

[Claims] 1. A jacket structure for constructing a structure by being installed on the underwater ground, wherein a plurality of pile guide members are connected by a connecting member, and a lower part of the pile guide member is provided with a pile installed on the underwater ground. A jacket structure provided with guide means for guiding an upper end portion into the pile guide member. 2. The jacket structure according to claim 1, wherein said guide means has a fitting portion into which an upper end of said pile is fitted. 3. The jacket structure according to claim 1, wherein the guide means is a plurality of radially movable attachment pieces provided along a circumferential direction on a lower inner peripheral surface of the pile guide member. A jacket structure characterized by the following. 4. The jacket structure according to claim 3, wherein the plurality of mounting pieces can be moved inward in a radial direction of the pile guide member by bolts to hold an upper end of the pile. Jacket structure. 5. The jacket structure according to claim 1, wherein the guide means is a skirt member fixed to a lower end of the pile guide member and having a diameter larger than an outer diameter of the pile guide member. And the jacket structure. 6. The jacket structure according to claim 1, wherein said guide means is an adjust ring provided inside a lower portion of said pile guide member and expandable and contractable by bolts. 7. The jacket structure according to claim 1, wherein the guide means is a plurality of support ribs along the axial direction fixed along the circumferential direction on the inner peripheral surface at the lower end of the pile guide member. A distinctive jacket structure. 8. A pile structure in which a plurality of cylindrical pile guide members are integrally connected by a connecting member is moved down to a plurality of piles cast at a predetermined position on the underwater ground, and the pile guide is formed. The upper end of the pile is guided into the pile guide member by a guide means provided at the lower part of the member, and fitted, and the lower part of the pile guide member and the upper part of the pile are connected at a predetermined fitting position. And fixing the jacket structure to the underwater ground.