JP6927165B2 - How to remove joint structures, pile-type structures and pile-type structures - Google Patents

Description

The present invention relates to a method for removing a joint structure, a pile-type structure, and a pile-type structure, and more particularly, a joint structure that enables easy removal work of the pile-type structure and a pile that is easy to remove. The present invention relates to a type structure and a method for removing the pile type structure. In particular, the present invention is suitably applicable to offshore wind power generation equipment and offshore wind condition observation equipment installed for business feasibility evaluation in offshore wind power generation.

In recent years, wind power generation has been attracting attention from the viewpoint of eco-energy, and from the viewpoint of the obtained wind power and location conditions, wind power generation at sea is particularly attracting attention.

As a structure used for offshore wind power generation and offshore wind condition observation, which is the evaluation of the project in the previous stage, a pile-type structure in which a jacket is supported by a steel pipe pile driven into the submerged ground is well known.

Here, the jacket is a structure in which the legs (legs) of the steel pipes covering the steel pipe piles are three-dimensionally connected by diagonal members or horizontal members, and is a structure having a skeleton structure mainly composed of steel members. Including, for example, a structure in which the skeleton structure is completed in the underwater part and becomes a monopole (one pillar) in the water surface part (for example, a three-pile type tripot structure) is included.

In Patent Document 1, as a method of constructing a structure using a jacket, the following construction method, that is, a method of constructing a jacket structure for constructing a structure by installing in a water area, which is a plurality of methods for constructing a structure in a water area. A foundation pile is installed, and an external steel pipe constituting the divided jacket structure formed by dividing the jacket structure into a plurality of pieces in the vertical direction is inserted and installed in the foundation pile, and the flange portion provided on the outer periphery of the foundation pile is provided. A ring-shaped ridge or a plurality of protrusions provided on the inner air surface of the external steel pipe by locking the external steel pipe and inserting and installing the external steel pipe constituting the remaining divided jacket structure into the foundation pile. Is locked to the top end of the foundation pile, a bottom mold is installed on the outer periphery of the foundation pile at the lower end of the external steel pipe, and a filler is filled between the external steel pipe and the foundation pile. A method for constructing a jacket structure has been proposed, which comprises joining the foundation pile and the divided jacket structure.

In the method for constructing the jacket structure described in Patent Document 1, since the divided jacket structure formed by dividing the jacket structure into a plurality of pieces in the vertical direction is sequentially installed on the foundation pile, the jacket structure is enlarged. In some cases or even in water areas with limited sky, it may be possible to construct a jacket structure.

On the other hand, it may be assumed that the offshore wind power generation equipment will be removed after about 20 years of service, and the offshore wind condition observation equipment will be removed after about 2 years of service, but in principle, the removal will be carried out to restore the status quo. In principle, all of them, including the steel pipe piles in the soil, should be removed.

For this reason, it is preferable that the structure used for the offshore wind power generation facility not only pursues advantages in construction but also considers convenience in the situation of removal.

However, the method for constructing the jacket structure described in Patent Document 1 does not consider the convenience in the scene of removing the constructed jacket structure.

Japanese Unexamined Patent Publication No. 2005-133485

The present invention has been made in view of the above points, and is a joint structure between a steel pipe pile and a jacket that enables easy removal work of a pile-type structure, a pile-type structure that is easy to remove, and a pile-type structure. An object of the present invention is to provide a method for removing a pile-type structure.

The present invention solves the above-mentioned problems by the following joint structure of a steel pipe pile and a jacket and a method of removing a pile-type structure and a pile-type structure.

That is, the first aspect of the joint structure according to the present invention includes a steel pipe pile and an external steel pipe externally inserted into the steel pipe pile and partially formed with a connection portion with a jacket. A joint structure in which the gap between the externally inserted steel pipe and the steel pipe pile is filled with grout and joined, and the grout in the gap between the externalized steel pipe and the steel pipe pile is the external insertion. It is a joint structure characterized in that it is filled only above a predetermined position above the upper end of the connection portion of the steel pipe.

A second aspect of the joint structure according to the present invention includes a steel pipe pile and an external steel pipe externally inserted into the steel pipe pile and partially formed with a connection portion with a jacket, and the steel pipe is provided. It is a joint structure in which a grout is filled in the gap between the pile and the external steel pipe to be externally inserted and joined, and the grout in the gap between the external steel pipe to be externalized and the steel pipe pile is the grout of the external steel pipe. A joint structure is provided between the upper end of the connection portion and the predetermined position where the grout is filled, which is filled only above the predetermined position above the upper end of the connection portion. The joint structure is such that the gap between the external steel pipe portion joined by the grout filled in the gap with the steel pipe pile and the steel pipe pile is not filled with grout and is not joined by the grout. It is a joint structure characterized in that it is separably connected to a portion of an external steel pipe.

The joint structure may be configured to have a flange portion in which flange surfaces orthogonal to the longitudinal direction of the extrapolated steel pipe are connected by bolts.

The joint structure is a first and second connection in which an intermediate member forming a part of the external steel pipe and another part of the external steel pipe located above and below the intermediate member are connected to the intermediate member. The intermediate member has a structure and is composed of a plurality of members joined by bolts to cover the outer peripheral surface of the steel pipe pile, and the outer peripheral surface of the steel pipe pile can be exposed by removing the intermediate member. In addition, the intermediate member and each of the first and second connecting structures are connected by bolts to the flange surfaces orthogonal to the longitudinal direction of the external steel pipe, and the intermediate member and the first connecting structure are connected to each other. The intermediate member may be made removable from the steel pipe pile by releasing the bolt connection with the second connecting structure and releasing the bolt connection of the intermediate member.

The pile-type structure according to the present invention comprises a first or second aspect of the joint structure according to the present invention and a jacket connected via a connecting member connected to a connecting portion of the external steel pipe. It is a pile-type structure characterized by having.

The jacket is provided with a leg extending downward, and a ground contact surface that can be installed on the bottom ground is formed at the end of the leg, and a part of the leg and the connection portion of the extrapolated steel pipe are the above. The jacket may be configured to be erected by being connected via a connecting member.

In the first aspect of the method for removing a pile-type structure according to the present invention, a jacket, a steel pipe pile, and a connecting portion externally attached to the steel pipe pile and connected to the jacket via a connecting member are partially formed. The external steel pipe is provided, and the grout in the gap between the external steel pipe to be externalized and the steel pipe pile is filled only upward from a predetermined position above the upper end of the connection portion of the external steel pipe. In the method of removing the pile-type structure, the portion of the external steel pipe between the upper end of the connecting portion and the predetermined position filled with grout is cut in the transverse direction to form the steel pipe pile. A method for removing a pile-type structure, which comprises an external steel pipe cutting step for separating the jacket connected to the connecting portion via the connecting member.

In the first aspect of the method for removing a pile-type structure according to the present invention, the jacket is provided with a leg extending downward, and a ground plane that can be installed on the bottom ground is formed at the end of the leg. The part of the leg and the connecting portion of the extrapolated steel pipe may be connected via a connecting member so that the jacket is erected.

In the first aspect of the method for removing a pile-type structure according to the present invention, a steel pipe pile that cuts a portion of the steel pipe pile between the upper end of the connection portion and the predetermined position filled with grout in the transverse direction. After the cutting step, the external steel pipe cutting step, and the steel pipe pile cutting step, the portion of the external steel pipe to which the jacket is connected via the connecting member is pulled out from the cut steel pipe pile, and the said It may have a jacket removing step of removing the jacket.

After the jacket removing step, there may be a steel pipe pile removing step of pulling out and removing the portion of the steel pipe pile which is at least partially embedded in the ground from the ground.

The external steel pipe cutting step and the steel pipe pile cutting step are continuous cutting steps in which the external steel pipe and the steel pipe pile portion are continuously cut in the transverse direction with a wire saw to separate the steel pipe pile and the jacket. It may be.

In the first aspect of the method for removing a pile-type structure according to the present invention, after the external steel pipe cutting step, the steel pipe pile is pulled out from the ground together with the portion of the external steel pipe to be ground-joined and removed. It may have a steel pipe pile removing step and a jacket removing step of removing the jacket after the steel pipe pile removing step.

In the second aspect of the method for removing a pile-type structure according to the present invention, a jacket, a steel pipe pile, and a connecting portion externally inserted into the steel pipe pile and connected to the jacket via a connecting member are partially formed. The external steel pipe is provided, and the grout in the gap between the external steel pipe to be externalized and the steel pipe pile is filled only upward from a predetermined position above the upper end of the connection portion of the external steel pipe. The portion of the external steel pipe joined by the grout filled in the gap with the steel pipe pile between the upper end of the connecting portion and the predetermined position filled with the grout, and the steel pipe pile. A pile-type structure having a joint structure that separably connects the external steel pipe portion in which the connection portion is formed, while the gap is not filled with the grout and is not joined by the grout. It has an external steel pipe separating step of separating the steel pipe pile and the jacket connected to the connecting portion via the connecting member by releasing the connection by the joint structure. This is a method for removing a pile-type structure, which is characterized in that.

The joint structure may have a flange portion in which flange surfaces orthogonal to the longitudinal direction of the external steel pipe are connected by bolts. In this case, the external steel pipe separation step is performed on the bolt of the joint structure. May be carried out by removing the above and disengaging the connection at the flange portion.

After the external steel pipe separation step, the steel pipe pile removing step of pulling out the steel pipe pile together with the portion of the external steel pipe joined by grout from the ground and removing the steel pipe pile, and after the steel pipe pile removing step, the jacket is removed. It may have a jacket removing step of removing.

After the steel pipe pile cutting step of cutting the steel pipe pile from the inside in the transverse direction between the upper end of the connection portion and the predetermined position filled with the grout, the external steel pipe separation step, and the steel pipe pile cutting step. After the jacket removing step of pulling out the portion of the external steel pipe to which the jacket is connected via the connecting member and removing the jacket from the cut steel pipe pile, and at least one after the jacket removing step. It may have a steel pipe pile removal step of pulling out a portion of the steel pipe pile whose portion is embedded in the ground from the ground and removing the portion.

In the second aspect of the method for removing a pile-type structure according to the present invention, the joint structure comprises an intermediate member forming a part of the external steel pipe and the external steel pipe located above and below the intermediate member. It has a first and second connecting structure in which the other part is connected to the intermediate member, and the intermediate member is composed of a plurality of members joined by bolts and forms an outer peripheral surface of the steel pipe pile. The outer peripheral surface of the steel pipe pile can be exposed by covering and removing the steel pipe pile, and the intermediate member and each of the first and second connecting structures are orthogonal to the longitudinal direction of the external steel pipe. The flange surfaces may be connected to each other by bolts. In this case, the external steel pipe separation step releases the bolt connection between the intermediate member and the first and second connecting structures, and the intermediate member. The intermediate member may be removed from the steel pipe pile by releasing the bolt connection of the plurality of members constituting the above.

After the steel pipe pile cutting step of removing the intermediate member in the external steel pipe separation step and then cutting the portion of the outer peripheral surface of the steel pipe pile covered by the intermediate member in the transverse direction, and after the steel pipe pile cutting step. It has a jacket removing step of removing the jacket, and a steel pipe pile removing step of pulling out and removing a portion of the steel pipe pile in a state of being embedded in the ground at least partly after the jacket removing step. You may do so.

A steel pipe pile removing step of removing the intermediate member in the external steel pipe separation step and then pulling out the steel pipe pile together with a grout-joined portion of the external steel pipe from the ground to remove the steel pipe pile, and a steel pipe pile removing step. After that, it may have a jacket removing step of removing the jacket.

Further, in the second aspect of the method for removing a pile-type structure according to the present invention, the portion of the steel pipe pile between the upper end of the connection portion and the predetermined position filled with the grout is cut in the transverse direction. After the steel pipe pile cutting step, the external steel pipe separation step, and the steel pipe pile cutting step, the portion of the external steel pipe to which the jacket is connected is pulled out from the cut steel pipe pile via the connecting member. , A jacket removing step of removing the jacket may be provided.

After the jacket removing step, the steel pipe pile removing step may be provided in which a portion of the steel pipe pile in a state of being embedded in the ground at least partially is pulled out from the ground and removed.

According to the present invention, it is possible to facilitate the work of removing the pile-type structure.

Front view of the offshore wind power generation facility 90 constructed by using the joint structure of the steel pipe pile and the jacket according to the first embodiment of the present invention. Front view showing an enlarged part of a pile-type structure 28 (pile-type structure 28 according to the first embodiment of the present invention) which is a substructure of an offshore wind power generation facility 90. Front view showing the part of the joint structure of the pile type structure 28 in a further enlarged manner. The figure which shows typically one step of the procedure of constructing the joint structure of a steel pipe pile and a jacket which concerns on 1st Embodiment of this invention. The figure which shows typically one step of the procedure of constructing the joint structure of a steel pipe pile and a jacket which concerns on 1st Embodiment of this invention. The figure which shows typically one step of the procedure of constructing the joint structure of a steel pipe pile and a jacket which concerns on 1st Embodiment of this invention. The figure which shows typically the typical state about one step of each step in the method of removing the pile-type structure which concerns on 1st Embodiment of this invention, and the modification thereof. The figure which shows typically the typical state about one step of each step in the method of removing the pile-type structure which concerns on 1st Embodiment of this invention, and the modification thereof. The figure which shows typically the typical state about one step of each step in the method of removing the pile type structure which concerns on 1st Embodiment of this invention. The figure which shows typically the typical state about one step of each step in the method of removing the pile type structure which concerns on 1st Embodiment of this invention. The figure which shows typically the typical state about one step of each step in the method of removing the pile type structure which concerns on 1st Embodiment of this invention. The figure which shows typically the typical state about one step of each step in the method of removing the pile type structure which concerns on 1st Embodiment of this invention. The figure which shows typically the typical state about one step of each step in the modification of the method of removing a pile-type structure which concerns on 1st Embodiment of this invention. The figure which shows typically the typical state about one step of each step in the modification of the method of removing a pile-type structure which concerns on 1st Embodiment of this invention. A front view showing an enlarged portion of a joint structure between a steel pipe pile and a jacket according to a second embodiment of the present invention. Front view schematically showing one step of the procedure for constructing a joint structure of a steel pipe pile and a jacket according to a second embodiment of the present invention. Front view schematically showing one step of the procedure for constructing a joint structure of a steel pipe pile and a jacket according to a second embodiment of the present invention. Front view schematically showing one step of the procedure for constructing a joint structure of a steel pipe pile and a jacket according to a second embodiment of the present invention. Front view schematically showing a typical state for one step of each step in the method for removing a pile-type structure according to a second embodiment of the present invention. Front view schematically showing a typical state for one step of each step in the method for removing a pile-type structure according to a second embodiment of the present invention. Front view schematically showing a typical state for one step of each step in the method for removing a pile-type structure according to a second embodiment of the present invention. Front view of the offshore wind power generation facility 96 constructed by using the joint structure of the steel pipe pile and the jacket according to the third embodiment of the present invention. Front view showing an enlarged part of the pile type structure 50 which is the substructure of the offshore wind power generation facility 96. Front view showing the part of the joint structure of the pile type structure 50 in a further enlarged manner. FIG. 24 is a cross-sectional view taken along the line XXV-XXV. The figure which shows typically one step of the procedure of constructing the joint structure of a steel pipe pile and a jacket which concerns on 3rd Embodiment of this invention. The figure which shows typically one step of the procedure of constructing the joint structure of a steel pipe pile and a jacket which concerns on 3rd Embodiment of this invention. The figure which shows typically one step of the procedure of constructing the joint structure of a steel pipe pile and a jacket which concerns on 3rd Embodiment of this invention. The figure which shows typically the typical state about one step of each step in the method of removing the pile-type structure which concerns on 3rd Embodiment of this invention, and the modification thereof. The figure which shows typically the typical state about one step of each step in the method of removing the pile type structure which concerns on 3rd Embodiment of this invention. The figure which shows typically the typical state about one step of each step in the method of removing the pile type structure which concerns on 3rd Embodiment of this invention. The figure which shows typically the typical state about one step of each step in the method of removing the pile type structure which concerns on 3rd Embodiment of this invention. The figure which shows typically the typical state about one step of each step in the method of removing the pile type structure which concerns on 3rd Embodiment of this invention. The figure which shows typically the typical state about one step of each step in the modification of the method of removing a pile-type structure which concerns on 3rd Embodiment of this invention. The figure which shows typically the typical state about one step of each step in the modification of the method of removing a pile-type structure which concerns on 3rd Embodiment of this invention. A front view showing an enlarged portion of a joint structure between a steel pipe pile and a jacket according to a fourth embodiment of the present invention. FIG. 36 is a cross-sectional view taken along the line XXXVII-XXXVII. Exploded view seen from the side schematically showing the state before mounting the joint structure 68

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(1) First Embodiment (1-1) Joint structure of steel pipe pile and jacket according to the first embodiment FIG. 1 uses the joint structure of the steel pipe pile and the jacket according to the first embodiment of the present invention. It is a front view of the constructed offshore wind power generation facility 90, and FIG. 2 is a pile type structure 28 (pile type structure 28 according to the first embodiment of the present invention) which is a substructure of the offshore wind power generation facility 90. It is a front view which shows the part enlarged, and FIG. 3 is a front view which shows the part of the joint structure of the pile type structure 28 further enlarged. 4 to 6 are views schematically showing a procedure for constructing a joint structure of a steel pipe pile and a jacket according to the first embodiment of the present invention, and are vertical cross-sectional views showing an enlarged portion of the joint structure (FIG. 4 to 6). It is a cross-sectional view cut in a vertical plane passing through the central axis of the extrapolated steel pipe 12.

The joint structure 11 according to the first embodiment of the present invention includes a steel pipe pile 100 and an extrapolated steel pipe 12 extrapolated to the steel pipe pile 100, and the extrapolated steel pipe 12 is a connecting steel material welded to a jacket 92. It has a connection portion 13 with 94. The joint structure 11 according to the first embodiment is formed between the steel pipe pile 100 and the external steel pipe through the grout 14 (see FIG. 6) filled in the gap 16 (see FIG. 5) between the steel pipe pile 100 and the external steel pipe 12. It is a joint structure to which 12 is joined.

The extrapolated steel pipe 12 is connected to the leg 92A of the jacket 92 via the connecting steel material 94. Specifically, the connecting steel material 94 is welded to the outer peripheral surface of the lower part of the extrapolated steel pipe 12 and the outer peripheral surface of the lower part of the leg 92A, and the extrapolated steel pipe 12 is connected to the leg 92A of the jacket 92 via the connecting steel material 94. The extrapolated steel pipe 12 is a member different from the jacket 92 (a member not included in the jacket 92). The connecting steel material 94 is composed of three steel plates, and more specifically, the upper flange 94A, the lower flange 94B, and the web 94C. The "connection portion" of the extrapolated steel pipe 12 here refers to a region where the connecting steel material 94 is welded, and here, the height position of the upper flange 94A coincides with the "upper end of the connection portion". There is.

Then, when the grout 14 is filled in the gap 16 between the steel pipe pile 100 and the extrapolated steel pipe 12 from above, the filling of the grout 14 is stopped up to a predetermined position above the "upper end of the connection portion". When removing the jacket 92, the portion below the region filled with the grout 14 and above the "upper end of the connection portion" without worrying about interference with the connecting steel material 94 or the like with the jacket 92. The extrapolated steel pipe 12 and the steel pipe pile 100 inside the extrapolated steel pipe 12 can be easily cut.

In the first embodiment, the region below the region filled with the grout 14 to the upper end of the connecting portion is the cut portion 20 at the time of removal, that is, the portion that can be easily cut at the time of removal.

Regarding the shape (size) of the extrapolated steel pipe 12 in the cross-sectional direction, the distance between the inner surface of the extrapolated steel pipe 12 and the outer surface of the steel pipe pile 100 (width of the gap 16) allows appropriate grout filling. If the width is set so that the force transmission after the grout is hardened (the force transmission between the inner surface of the extrapolated steel pipe 12 and the outer surface of the steel pipe pile 100 via the grout 14) is good. good. When both the extrapolated steel pipe 12 and the steel pipe pile 100 have a cylindrical shape, the distance (width of the gap 16) between the inner surface of the extrapolated steel pipe 12 and the outer surface of the steel pipe pile 100 is usually It will be about 5 cm.

The length of the extrapolated steel pipe 12 is the filling range of the grout 14 (the range of the grout filling portion 18 in the longitudinal direction of the extrapolated steel pipe 12) and the cutting portion 20 at the time of removal, which are necessary to obtain the joint strength required for the design. It may be appropriately determined according to the arrangement range. The range of the grout filling portion 18 (the length in the longitudinal direction of the extrapolated steel pipe 12 in the range) is determined by design calculation, but it is usually about three times as long as the pile diameter of the steel pipe pile 100. .. The steel pipe pile 100 is driven into the bottom ground 102. Further, a mud mat 92B is attached to the lower end of the leg 92A of the jacket 92 and the lower end of the extrapolated steel pipe 12 by welding so that the jacket 92 can be stably grounded to the bottom ground 102. Further, a spacer 12A is provided on the inner surface of the lower portion of the extrapolated steel pipe 12 so that the distance between the inner surface of the extrapolated steel pipe 12 and the outer surface of the steel pipe pile 100 is not biased. The spacer 12A may be arranged on the inner surface of the lower portion of the extrapolated steel pipe 12 at a predetermined interval in the circumferential direction. It may be arranged at a position where it can be divided.

In the joint structure 11 according to the first embodiment, a grout seal 22 (see FIGS. 4 to 6) is provided at the lower end of the grout filling portion 18, and the range of the grout filling portion 18 and the cutting portion at the time of removal are provided. The range of 20 is clearly separated. As the grout seal 22, a grout seal made of rubber or the like can be used. Since each grout seal has a limit of the casting pressure that can be sealed, an appropriate grout seal may be appropriately selected in consideration of the casting pressure.

In the grout filling portion 18, shear keys 18A (see FIGS. 4 to 6) are provided on the inner surface of the extrapolated steel pipe 12 at predetermined intervals, and shear keys 18B (see FIGS. 4 to 6) are provided on the outer surface of the steel pipe pile 100 at predetermined intervals. 5 and FIG. 6) are provided so that the force can be satisfactorily transmitted between the extrapolated steel pipe 12 and the steel pipe pile 100 via the grout 14. The shapes of the shear keys 18A and 18B are not particularly limited, and welded bead type, square steel type, round steel type and the like can be appropriately used.

The grout 14 to be filled in the gap 16 between the steel pipe pile 100 and the extrapolated steel pipe 12 has a high filling performance so that the force can be transmitted well between the steel pipe pile 100 and the extrapolated steel pipe 12. It is preferable to use, and specifically, it is preferable to use an expanded mortar or a cloth-separable mortar in water.

As shown in FIG. 6, the cut portion 20 at the time of removal is formed in a region between the grout seal 22 and the upper flange 94A (upper end of the connecting portion 13) of the connecting steel material 94, that is, the upper end of the connecting portion 13 and the grout above this. It is an area including a portion to be cut at the time of removal between the seal 22 position (predetermined position). When the extrapolated steel pipe 12 of the cut portion 20 at the time of removal is cut in the transverse direction, the connection between the portion of the extrapolated steel pipe 12 (the portion below the cutting position) connected to the connecting steel material 94 and the grout filling portion 18 is released. Therefore, the steel pipe pile 100 and the jacket 92 are separated from each other.

By recording the position of the grout seal 22 for each extrapolated steel pipe 12, the upper end position (lower end position of the grout seal 22) of the cut portion 20 at the time of removal is inspected other than visually after the joint structure 11 is completed. It can be recognized without it. Further, the lower end position of the cut portion 20 at the time of removal is the position where the upper flange 94A of the connecting steel material 94 is connected on the outer surface of the extrapolated steel pipe 12, and the upper flange 94A of the connecting steel material 94 is the joint structure 11. Since it is visible from the outside even after completion, the position of the lower end of the cut portion 20 at the time of removal can be recognized without performing an inspection other than visual inspection after completion of the joint structure 11.

Therefore, in the joint structure 11 according to the first embodiment, even after the joint structure 11 is completed, the range of the cut portion 20 at the time of removal can be recognized without performing an inspection other than visual inspection.

Here, the inspection other than visual inspection is an inspection using an instrument, for example, a non-destructive inspection using an instrument.

Even if the extrapolated steel pipe 12 of the grout filling portion 18 is cut in the transverse direction, the inner surface of the portion of the extrapolated steel pipe 12 that is connected to the connecting steel material 94 (the portion below the cutting position). Since the grout 14 remains between the steel pipe pile 100 and the outer surface (because a part of the grout filling portion 18 remains below the cutting position), the steel pipe pile 100 and the jacket 92 cannot be separated from each other. Further, even if the portion of the extrapolated steel pipe 12 below the upper flange 94A of the connecting steel material 94 is cut in the transverse direction, it is connected to at least a part of the upper flange 94A and the web 94C of the connecting steel material 94. Since the connection between the portion of the extrapolated steel pipe 12 (the portion above the cutting position) and the grout filling portion 18 is not released, the steel pipe pile 100 and the jacket 92 are not separated.

Further, at least a part of the region of the cut portion 20 at the time of removal is located above the bottom ground 102, and the extrapolated steel pipe 12 of the cut portion 20 at the time of removal is positioned at a height above the bottom ground 102. By making it possible to cut in the transverse direction, it is possible to eliminate the work of digging up the bottom ground 102, and it is possible to improve the workability at the time of cutting work at the time of removal.

(1-2) Structure of Pile-type Structure According to First Embodiment The pile-type structure 28 according to the first embodiment of the present invention is a substructure of the offshore wind power generation facility 90 as shown in FIG. ..

As shown in FIGS. 1 and 2, the pile-type structure 28 according to the first embodiment includes a joint structure 11 in which an external steel pipe 12 and a steel pipe pile 100 are joined by a grout 14 (see FIG. 6). It has a jacket 92, and the jacket 92 and the joint structure 11 are connected via a connecting steel material 94.

(1-3) Method for constructing a joint structure between a steel pipe pile and a jacket according to the first embodiment FIGS. 4 to 6 show a procedure for constructing a joint structure between a steel pipe pile and a jacket according to the first embodiment of the present invention. Is a diagram schematically showing

Hereinafter, the method for constructing the joint structure according to the first embodiment of the present invention will be described in steps with reference to FIGS. 4 to 6, etc., but FIGS. 4 to 6 are representative of the main steps. It is a diagram schematically showing only the states, and does not necessarily represent all the states in each step.

<Step S1>
The jacket 92 (see FIGS. 1 and 2) is transported to the planned installation point by a pontoon (not shown).

<Step S2>
If necessary, level the jacket 92 on the bottom ground 102 at the planned installation point, and then lift the jacket 92 with a crane (not shown) on the pontoon (not shown) on the bottom ground 102 at the planned installation point. The jacket 92 is sunk at a predetermined position of (see FIG. 4). An extrapolated steel pipe 12 is attached to the leg 92A of the jacket 92 in advance via a connecting steel material 94 (upper flange 94A, lower flange 94B, web 94C) at the factory. Is also placed in place.

<Step S3>
After the jacket 92 is sunk at a predetermined position at the planned installation point, the steel pipe pile 100 is placed in the extrapolated steel pipe 12 connected to the jacket 92, and the steel pipe pile 100 is driven into the submerged ground 102 to a predetermined depth. (See FIG. 5). Since the extrapolated steel pipe 12 connected to the jacket 92 also serves as a template, it is not necessary to use the template when arranging the steel pipe pile 100.

<Step S4>
The grout 14 is filled in the gap 16 between the inner surface of the extrapolated steel pipe 12 and the outer surface of the steel pipe pile 100 (see FIG. 6). The grout 14 is filled in the gap 16 above the grout seal 22. Further, the grout 14 is filled in the gap 16 until the grout 14 flows out from the discharge pipe (not shown) arranged above the extrapolated steel pipe 12, and the grout 14 is sufficiently filled up to the upper end of the extrapolated steel pipe 12. Therefore, the range of the grout filling portion 18 is the range from the upper end of the grout seal 22 to the upper end of the extrapolated steel pipe 12. As described above, the adjustment of the position of the grout filling portion does not necessarily require the use of the grout seal. That is, it is possible to empirically fill the grout to a desired position without using a grout seal by controlling the filling such as the viscosity of the grout to be filled and the grout filling speed and pressure in the filling step.

When the cured grout 14 is cured and a predetermined strength is developed, the construction of the bonded structure according to the first embodiment is completed.

In the method for constructing the joint structure between the steel pipe pile and the jacket according to the first embodiment described above, the jacket 92 is sunk in step S2 and then the steel pipe pile 100 is driven in step S3. Or the like, the steel pipe pile 100 may be driven first, and then the jacket 92 may be sunk.

(1-4) Method for constructing pile-type structure according to the first embodiment For all of the external steel pipes 12 connected to the jacket 92, the above-mentioned "(1-3) Steel pipe pile and jacket according to the first embodiment". By carrying out the procedure of steps S1 to S4 of "Method for constructing a joint structure of the above", the pile-type structure 28 (see FIGS. 1 and 2) according to the first embodiment can be constructed.

(1-5) Method for Removing Pile-type Structure According to First Embodiment The method for removing the pile-type structure according to the first embodiment of the present invention is the joint structure 11 according to the first embodiment of the present invention. This is a method of removing the pile-type structure 28 provided.

7 to 12 are diagrams schematically showing a typical state of each step in the method for removing the pile-type structure according to the first embodiment of the present invention. It is a front view drawn so that the entire jacket 92 fits in, and the figure (B) is a vertical cross-sectional view showing an enlarged part of the joint structure (cross-sectional view cut in a vertical plane passing through the central axis of the extrapolated steel pipe 12). Is. Further, in each of the views of FIGS. 7 to 12, in the figure of (A), a cross section cut in a vertical plane passing through the central axis of the extrapolated steel pipe 12 is drawn for the portion of the joint structure.

Hereinafter, the method for removing the pile-type structure according to the first embodiment of the present invention will be described in steps with reference to FIGS. 7 to 12, etc., and FIGS. 7 to 12 are representative of the main steps. It is a diagram schematically showing only a typical state, and does not necessarily represent all the states in each step.

<Step S11>
FIG. 7A is a schematic front view showing the state of the pile-type structure 28 before the start of the removal work, and FIG. 7B is a joint structure of the pile-type structure 28 before the start of the removal work. It is a vertical cross-sectional view (cross-sectional view cut in a vertical plane passing through the central axis of the external steel pipe 12) showing the portion of. As shown in FIGS. 7A and 7B, the pile-type structure 28 is fixed to the bottom ground 102 in a stable state.

<Step S12>
As shown in FIGS. 8A and 8B, the portion of the cut portion 20 at the time of removal of the extrapolated steel pipe 12 is cut in the transverse direction, and the extrapolated steel pipe upper portion 12B and the extrapolated steel pipe lower portion 12C are cut. As a result, the edge of the extrapolated steel pipe lower portion 12C connected to the jacket 92 via the connecting steel material 94 is cut off from the grout filling portion 18, and the edge between the steel pipe pile 100 and the jacket 92 is cut off.

The cutting method used for this cutting is not particularly limited, and any cutting method capable of safely performing cutting work can be adopted. For example, low-cost fusing can be used.

Further, since the cutting portion 20 at the time of removing the joint structure according to the first embodiment is located above the bottom ground 102, the cutting operation can be performed without digging up the bottom ground 102.

As described above, since the edge of the grout filling portion 18 with the jacket 92 is cut by the completion of this step S12, it is possible to pull out the steel pipe pile 100 together with the grout filling portion 18 and remove it at this stage. be. This removal method will be described in "(1-6) Modification of the removal method of the pile-type structure according to the first embodiment" as a modification of the removal method of the pile-type structure according to the first embodiment.

<Step S13>
The portion of the steel pipe pile 100 at the same height position corresponding to the portion of the extrapolated steel pipe 12 cut in step S12 is cut with a cutter from the inner surface side of the steel pipe pile 100 (see FIGS. 9A and 9B). As a result, the pile head 100A of the steel pipe pile 100, together with the grout filling portion 18, is the main body portion of the steel pipe pile 100 embedded in the bottom ground 102 (the portion of the steel pipe pile 100 other than the pile head 100A. , It will be referred to as the steel pipe pile main body 100B).

The reason for cutting the steel pipe pile 100 from the inner surface side of the steel pipe pile 100 with a cutter is that when the external steel pipe 12 is cut by fusing in step S12, the width of the cut portion 12D is only about 5 to 10 mm in the vertical direction, and the external insertion. This is because it is difficult to cut the steel pipe pile 100, which is about 5 cm inside the steel pipe 12, by fusing.

In step S12, the portion of the cut portion 20 at the time of removal of the external steel pipe 12 is cut in the transverse direction by fusing, and in step S13, the portion of the steel pipe pile 100 at the same height position corresponding to the cut portion 12D is cut. Although the steel pipe pile 100 was cut from the inner surface side with a cutter, the external steel pipe 12 and the steel pipe pile 100 can be cut at once with a wire saw if the environment allows the use of a wire saw.

Further, when cutting the steel pipe pile 100 from the inner surface side of the steel pipe pile 100 with a cutter, the cut portion of the steel pipe pile 100 needs to be within the area of the cut portion 20 at the time of removal, but the cut portion 20 at the time of removal of the extrapolated steel pipe 12 is not necessarily the same. It does not have to be the same height as the part. Further, the steel pipe pile 100 may be cut before the extrapolated steel pipe 12 is cut.

<Step S14>
With the completion of step S13, the pile head 100A including the grout filling portion 18 is separated from the steel pipe pile main body 100B embedded in the jacket 92 and the bottom ground 102 (see FIGS. 9A and 9B). Therefore, it is in a state where it can be easily removed. Therefore, as shown in FIGS. 10A and 10B, the pile head 100A including the grout filling portion 18 is removed in this step S14.

<Step S15>
After completing the removal of the pile head 100A including the grout filling portion 18 in step S14, as shown in FIGS. 11A and 11B, in the step S15, the jacket 92 is raised upward and removed. do.

<Step S16>
With the completion of step S15, the removal of the jacket 92 is completed, and only the portion of the steel pipe pile main body 100B excluding the pile head 100A is left in the bottom ground 102. Therefore, as shown in FIGS. 12A and 12B, in this step S16, the steel pipe pile main body 100B left on the bottom ground 102 is pulled out from the bottom ground 102 and removed.

Since the cut portion 20 at the time of removal of the joint structure according to the first embodiment is located above the bottom ground 102, the cut position of the steel pipe pile 100 is above the bottom ground 102 and remains in the bottom ground 102. The upper end of the steel pipe pile main body 100B is in a state of protruding from the bottom ground 102. Therefore, in this step S16, when the steel pipe pile main body 100B left in the bottom ground 102 is pulled out from the bottom ground 102, chucking is easy to be performed, and the pulling work is easy to be performed.

(1-6) Modification Example of Removal Method of Pile-type Structure According to First Embodiment A modification of the removal method of pile-type structure according to the first embodiment of the present invention is described in "(1-5)" above. As described in the final paragraph of step S12 of "Method for removing pile-type structure according to the first embodiment", after step S12 of the method for removing pile-type structure according to the first embodiment, the steel pipe pile 100 is grouted. It is a removal method in which the filling portion 18 is pulled upward and removed, and is a removal method in which the steel pipe pile 100 is not cut. Further, it is a method of removing the jacket 92 after pulling out and removing the steel pipe pile 100, and the order of removing the steel pipe pile 100 and the jacket 92 is opposite to the method of removing the pile type structure according to the first embodiment. It has become.

7, FIG. 8, FIG. 13, and FIG. 14 are diagrams schematically showing typical states of each step in the modified example of the method for removing the pile-type structure according to the first embodiment of the present invention. In both figures, the figure (A) is a front view drawn so that the entire jacket 92 fits in, and the figure (B) is a vertical cross-sectional view (the central axis of the extrapolated steel pipe 12) showing an enlarged portion of the joint structure. It is a cross-sectional view cut in a vertical plane through which it passes. Further, in each of the views of FIGS. 7, 8, 13, and 14, in the figure of (A), a cross section cut in a vertical plane passing through the central axis of the extrapolated steel pipe 12 is described for the portion of the joint structure. doing. Further, FIGS. 7 and 8 are views used in the explanation of the method for removing the pile-type structure according to the first embodiment, and the description of a modified example of the method for removing the pile-type structure according to the first embodiment. It is also used in.

Hereinafter, a modified example of the method for removing the pile-type structure according to the first embodiment of the present invention will be described in steps with reference to FIGS. 7, 8, 13, 14, and the like. 8, 13, and 14 are diagrams schematically showing only typical states in the main steps, and do not necessarily represent all the states in each step.

<Step S21>
FIG. 7A is a schematic front view showing the state of the pile-type structure 28 before the start of the removal work, and FIG. 7B is a joint structure of the pile-type structure 28 before the start of the removal work. It is a vertical cross-sectional view (cross-sectional view cut in a vertical plane passing through the central axis of the external steel pipe 12) showing the portion of. As shown in FIGS. 7A and 7B, the pile-type structure 28 is fixed to the bottom ground 102 in a stable state.

<Step S22>
As shown in FIGS. 8A and 8B, the portion of the cut portion 20 at the time of removal of the extrapolated steel pipe 12 is cut in the transverse direction, and the extrapolated steel pipe upper portion 12B and the extrapolated steel pipe lower portion 12C are cut. As a result, the force for pulling out the steel pipe pile 100 upward is not transmitted to the jacket 92. Therefore, even if the steel pipe pile 100 is pulled out together with the grout filling portion 18 and removed, the force is not transmitted to the jacket 92.

The cutting method used for this cutting is not particularly limited, and any cutting method capable of safely performing cutting work can be adopted. For example, low-cost fusing can be used.

Further, since the cutting portion 20 at the time of removing the joint structure according to the first embodiment is located above the bottom ground 102, the cutting operation can be performed without digging up the bottom ground 102.

<Step S23>
With the completion of step S22, the force for pulling out the steel pipe pile 100 upward is not transmitted to the jacket 92. Therefore, in the modified example of the method for removing the pile type structure according to the first embodiment, in step S23, As shown in FIG. 13, the steel pipe pile 100 is pulled upward together with the grout filling portion 18 to be removed.

Since the cut portion 20 at the time of removal of the joint structure according to the first embodiment is located above the bottom ground 102, the heads of the grout filling portion 18 and the steel pipe pile 100 are above the bottom ground 102. The heads of the grout filling portion 18 and the steel pipe pile 100 are in a state of protruding from the bottom ground 102. Therefore, in this step S23, when the grout filling portion 18 and the steel pipe pile 100 are pulled out from the bottom ground 102, chucking is easy to be performed, and the pulling out work is easy to be performed.

<Step S24>
After completing the removal of the grout filling portion 18 and the steel pipe pile 100 in step S23, the jacket 92 is lifted upward and removed in this step S24 as shown in FIGS. 14A and 14B.

(1-7) Effect of First Embodiment In the joint structure 11 according to the first embodiment, the connected jacket 92 can be easily cut by cutting the cut portion 20 at the time of removal of the extrapolated steel pipe 12. Can be removed.

Therefore, the method for removing the joint structure 11 according to the first embodiment, the pile-type structure 28 according to the first embodiment, and the pile-type structure according to the first embodiment (the first embodiment of the present invention). According to the method for removing the pile-type structure 28 including the joint structure 11 according to the above), it is possible to facilitate the removal work of the pile-type structure.

(2) Second Embodiment (2-1) Joint structure of steel pipe pile and jacket according to the second embodiment FIG. 15 shows a portion of the joint structure between the steel pipe pile and the jacket according to the second embodiment of the present invention. It is an enlarged front view. 16 to 18 are front views schematically showing a procedure for constructing a joint structure of a steel pipe pile and a jacket according to a second embodiment of the present invention.

The joint structure according to the second embodiment is an embodiment in which the joint structure 38 is provided in the removal separation portion 36, which is a portion corresponding to the removal cut portion 20 of the joint structure according to the first embodiment. The points other than the matters related to the above are the same as those of the joint structure according to the first embodiment. Therefore, in the joint structure according to the second embodiment, in principle, the same reference numerals and names are used for the members and parts corresponding to the members and parts of the joint structure according to the first embodiment and having the same function. , The explanation is omitted in principle.

The joint structure 31 according to the second embodiment of the present invention includes a steel pipe pile 100 and an extrapolated steel pipe 32 extrapolated to the steel pipe pile 100, and the extrapolated steel pipe 32 is a connecting steel material welded to a jacket 92. It has a connection portion 33 with 94. The joint structure 31 according to the second embodiment is formed between the steel pipe pile 100 and the external steel pipe via the grout 14 (see FIG. 18) filled in the gap 16 (see FIG. 17) between the steel pipe pile 100 and the external steel pipe 32. It is a joint structure to which 32 is joined.

The joint structure 31 according to the second embodiment includes a grout filling portion 34, which is a region where the gap 16 between the steel pipe pile 100 and the external steel pipe 32 is filled with the grout 14, and the steel pipe pile 100 and the external steel pipe 32. The gap 16 is not filled with grout 14, and is larger than the outer surface portion of the external steel pipe 32 connected to the upper flange 94A of the connecting steel material 94 (the upper end of the connecting portion 33 of the external steel pipe 32). It has a removal part 36 which is a region between the upper side and the lower end of the grout filling part 34 which is filled with grout. Then, a joint structure 38 is provided in the separation portion 36 at the time of removal. The joint structure 38 includes a portion of the external steel pipe 32 (upper steel pipe 32A) that is joined to the steel pipe pile 100 by grout filling and a portion of the external steel pipe 32 that is not grout-filled and is not joined to the steel pipe pile 100. (Lower steel pipe 32B) is separably connected. By disconnecting the joint structure 38, the jacket 92 connected to the portion of the extrapolated steel pipe 32 (lower steel pipe 32B) that is not joined to the steel pipe pile 100 can be separated from the steel pipe pile 100. ..

In the joint structure 31 according to the second embodiment, as in the first embodiment, a grout seal 22 (see FIGS. 16 to 18) is provided at the lower end of the grout filling portion 34, and the grout filling portion 34 is provided. And the range of the separation part 36 at the time of removal are clearly separated. As shown in FIGS. 16 to 18, the grout seal 22 is provided slightly above the joint structure 38, and the joint structure 38 is included in the region of the separation portion 36 at the time of removal.

The joint structure 38 has a flange portion 38A having flange surfaces 38A1 and 38A2 orthogonal to the longitudinal direction of the external steel pipe 32 so as to face each other, and a bolt 38B so as to cover the outer peripheral surface of the steel pipe pile 100 from the outside. The flange surfaces 38A1 and 38A2 that face each other are in contact with each other and are connected by bolts 38B.

The joint structure 38 is released from the connection by removing the bolt 38B. When the bolt 38B is removed, the joint structure 38 cannot transmit the vertical force applied in the direction of separating the opposing flange surfaces 38A1 and 38A2. Therefore, even if the steel pipe pile 100 is pulled out together with the grout filling portion 34 and removed, the steel pipe pile 100 cannot be removed. No force is transmitted to the jacket 92.

Therefore, by removing the bolt 38B of the joint structure 38, the steel pipe pile 100 can be pulled out together with the grout filling portion 34 and removed, and then the jacket 92 can be removed in sequence.

As a matter of course, since the joint structure 38 is visible from the outside, even after the joint structure of the steel pipe pile and the jacket according to the second embodiment is completed, no inspection other than visual inspection is performed. , The joint structure 38 can be recognized.

(2-2) Configuration of Pile-type Structure According to Second Embodiment The pile-type structure according to the second embodiment of the present invention is the same as the first embodiment in the pile-type structure 28 according to the first embodiment. It is a structure in which the joint structure 11 is replaced with the joint structure 31 according to the second embodiment. Illustration is omitted.

(2-3) Method for constructing a joint structure between a steel pipe pile and a jacket according to a second embodiment FIGS. 16 to 18 show a procedure for constructing a joint structure between a steel pipe pile and a jacket according to the second embodiment of the present invention. Is a diagram schematically showing

Hereinafter, the method for constructing the joint structure according to the second embodiment of the present invention will be described in steps with reference to FIGS. 16 to 18, etc., but FIGS. 16 to 18 are representative of the main steps. It is a diagram schematically showing only the states, and does not necessarily represent all the states in each step.

<Step S31>
The jacket 92 (see FIGS. 1 and 2) is transported to the planned installation point by a pontoon (not shown).

<Step S32>
If necessary, level the jacket 92 on the bottom ground 102 at the planned installation point, and then lift the jacket 92 with a crane (not shown) on the pontoon (not shown) on the bottom ground 102 at the planned installation point. The jacket 92 is sunk at a predetermined position of (see FIG. 16). An extrapolated steel pipe 32 is attached to the leg 92A of the jacket 92 in advance via a connecting steel material 94 (upper flange 94A, lower flange 94B, web 94C) at the factory. Is also placed in place. The extrapolated steel pipe 32 is in a state of being connected by the joint structure 38.

<Step S33>
After the jacket 92 is sunk at a predetermined position at the planned installation point, the steel pipe pile 100 is placed in the extrapolated steel pipe 32 connected to the jacket 92, and the steel pipe pile 100 is driven into the submerged ground 102 to a predetermined depth. (See FIG. 17). Since the extrapolated steel pipe 32 connected to the jacket 92 also serves as a template, it is not necessary to use the template when arranging the steel pipe pile 100.

<Step S34>
The grout 14 is filled in the gap 16 between the inner surface of the extrapolated steel pipe 32 and the outer surface of the steel pipe pile 100 (see FIG. 18). The grout 14 is filled in the gap 16 above the grout seal 22. Further, the grout 14 is filled in the gap 16 until the grout 14 flows out from the upper part of the extrapolated steel pipe 32, and the grout 14 is sufficiently filled up to the upper end of the extrapolated steel pipe 32. Therefore, the range of the grout filling portion 34 is the range from the grout seal 22 to the upper end of the extrapolated steel pipe 32.

When the cured grout 14 is cured and a predetermined strength is developed, the construction of the bonded structure according to the second embodiment is completed.

As described in the first embodiment, the adjustment of the position of the grout filling portion does not necessarily require the use of the grout seal.

(2-4) Method for constructing pile-type structure according to the second embodiment For all of the external steel pipes 32 connected to the jacket 92, the above-mentioned "(2-3) Steel pipe pile and jacket according to the second embodiment". By carrying out the procedure of steps S31 to S34 of "Method for constructing a joint structure of the above", a pile-type structure (not shown) according to the second embodiment can be constructed.

(2-5) Method for Removing Pile-type Structure According to Second Embodiment The method for removing the pile-type structure according to the second embodiment of the present invention is the joint structure 31 according to the second embodiment of the present invention. This is a method of removing the pile-type structure to be provided.

18 to 21 are front views schematically showing a typical state of each step in the method of removing the pile-type structure (pile-type structure including the joint structure 31) according to the second embodiment of the present invention. Is. In each figure, a cross section of the joint structure is drawn in a vertical plane passing through the central axis of the extrapolated steel pipe 32.

Hereinafter, the method for removing the pile-type structure according to the second embodiment of the present invention will be described in steps with reference to FIGS. 18 to 21 and the like. FIGS. 18 to 21 are representative of the main steps. It is a diagram schematically showing only a typical state, and does not necessarily represent all the states in each step. Further, FIG. 18 is a diagram used in the explanation of the method of constructing the joint structure of the steel pipe pile and the jacket according to the second embodiment, and also in the explanation of the method of removing the pile type structure according to the second embodiment. I am using it.

<Step S41>
FIG. 18 is a front view schematically showing the state of the pile-type structure (pile-type structure including the joint structure 31) before the start of the removal work, and is a front view schematically showing the pile-type structure (joint structure) before the start of the removal work. It is a vertical sectional view (cross-sectional view cut in the vertical plane passing through the central axis of the external steel pipe 32) which shows the part of the joint structure of the pile type structure provided with thing 31 in an enlarged manner. As shown in FIG. 18, the pile-type structure to be removed (the pile-type structure including the joint structure 31) is fixed to the bottom ground 102 in a stable state.

<Step S42>
As shown in FIG. 19, in the joint structure 38 of the pile type structure including the joint structure 31, the bolt 38B is removed. As a result, the joint structure 38 cannot transmit the vertical force applied in the direction of pulling the opposing flange surfaces 38A1 and 38A2 apart. Even if the steel pipe pile 100 is pulled out together with the grout filling portion 34 and removed, the force is not transmitted to the jacket 92.

<Step S43>
With the completion of step S42, the force for pulling out the steel pipe pile 100 upward is no longer transmitted to the jacket 92. Therefore, in the method for removing the pile-type structure according to the second embodiment, in step S43, FIG. As shown, the steel pipe pile 100 is pulled out from the bottom ground 102 together with the grout filling portion 34 and removed.

Since the separation portion 36 at the time of removal of the joint structure according to the second embodiment is located above the bottom ground 102, the heads of the grout filling portion 34 and the steel pipe pile 100 are above the bottom ground 102. The heads of the grout filling portion 34 and the steel pipe pile 100 are in a state of protruding from the bottom ground 102. Therefore, in this step S43, when the grout filling portion 34 and the steel pipe pile 100 are pulled out from the bottom ground 102, chucking is easy to be performed, and the pulling out work is easy to be performed.

<Step S44>
After completing the removal of the grout filling portion 34 and the steel pipe pile 100 in step S43, the jacket 92 is lifted upward and removed in this step S44 as shown in FIG. 21.

(2-6) Modification Example of Removal Method of Pile Type Structure According to Second Embodiment A modification of the removal method of pile type structure according to the second embodiment of the present invention is a modification of the pile type structure according to the second embodiment. Before step S42 (step of removing the bolt 38B of the joint structure 38) of the structure removing method, the portion of the steel pipe pile 100 corresponding to the separation portion 36 at the time of removal is cut from the inside of the steel pipe pile 100 in the transverse direction. After that, in step S42, the bolt 38B of the joint structure 38 is removed, the head of the steel pipe pile 100 and the upper steel pipe 32A of the external steel pipe 32 are separated from the portion of the steel pipe pile 100 embedded in the submerged ground 102, and the separated steel pipe pile is separated. The head of 100 and the upper steel pipe 32A of the external steel pipe 32 are removed. Then, after that, the jacket 92 is raised upward and removed. After removing the jacket 92, the portion of the steel pipe pile 100 remaining on the bottom ground 102 is pulled out from the bottom ground 102 and removed.

In the modification described above, before step S42 (the step of removing the bolt 38B of the joint structure 38), the portion of the steel pipe pile 100 located at the separation portion 36 at the time of removal was cut from the inside of the steel pipe pile 100 in the transverse direction. , This order is reversed, and after step S42 (step of removing the bolt 38B of the joint structure 38), the portion of the steel pipe pile 100 located at the separation portion 36 at the time of removal is cut from the inside of the steel pipe pile 100 in the transverse direction. You may.

(2-7) Effect of Second Embodiment In the joint structure 31 according to the second embodiment, extrapolation is performed by releasing the bolt connection of the joint structure 38 of the separation portion 36 at the time of removal of the extrapolated steel pipe 32. The upper steel pipe 32A and the lower steel pipe 32B of the steel pipe 32 can be easily separated, and the connected jacket 92 can be easily removed.

Therefore, the method for removing the joint structure 31 according to the second embodiment, the pile-type structure according to the second embodiment, and the pile-type structure according to the second embodiment (in the second embodiment of the present invention). According to the method for removing the pile-type structure including the joint structure 31), it is possible to facilitate the removal work of the pile-type structure.

(3) Third Embodiment (3-1) Joint structure of steel pipe pile and jacket according to the third embodiment FIG. 22 uses the joint structure of the steel pipe pile and the jacket according to the third embodiment of the present invention. It is a front view of the constructed offshore wind power generation facility 96, and FIG. 23 is a view of a pile type structure 50 (a pile type structure 50 according to a third embodiment of the present invention) which is a substructure of the offshore wind power generation facility 96. It is a front view which shows the part enlarged, FIG. 24 is a front view which shows the part of the joint structure of the pile type structure 50 further enlarged, and FIG. be. 26 to 28 are views schematically showing a procedure for constructing a joint structure of a steel pipe pile and a jacket according to a third embodiment of the present invention, and are vertical cross-sectional views showing an enlarged portion of the joint structure (FIG. 26 to 28). It is a cross-sectional view cut in a vertical plane passing through the central axis of the extrapolated steel pipe 42).

The joint structure according to the third embodiment is an embodiment in which the joint structure 48 is provided in the removal separation portion 46, which is a portion corresponding to the removal cut portion 20 of the joint structure according to the first embodiment. The points other than the matters related to the above are the same as those of the joint structure according to the first embodiment. Therefore, in the joint structure according to the third embodiment, in principle, the same reference numerals and names are used for the members and parts corresponding to the members and parts of the joint structure according to the first embodiment and having the same function. , The explanation is omitted in principle.

The joint structure 41 according to the third embodiment of the present invention includes a steel pipe pile 100 and an extrapolated steel pipe 42 extrapolated to the steel pipe pile 100, and the extrapolated steel pipe 42 is a connecting steel material welded to a jacket 92. It has a connection portion 43 with 94. The joint structure 41 according to the third embodiment is formed between the steel pipe pile 100 and the external steel pipe through the grout 14 (see FIG. 28) filled in the gap 16 (see FIG. 27) between the steel pipe pile 100 and the external steel pipe 42. It is a joint structure to which 42 is joined.

The joint structure 41 according to the third embodiment includes a grout filling portion 44, which is a region where the gap 16 between the steel pipe pile 100 and the external steel pipe 42 is filled with the grout 14, and the steel pipe pile 100 and the external steel pipe 42. The gap 16 is not filled with grout 14, and is larger than the outer surface portion of the external steel pipe 42 connected to the upper flange 94A of the connecting steel material 94 (the upper end of the connecting portion 43 of the external steel pipe 42). It has a removal part 46 which is a region between the upper side and the lower end of the grout filling part 44 which is filled with grout. Then, a joint structure 48 is provided in the separation portion 46 at the time of removal. The joint structure 48 includes a portion of the external steel pipe 42 (upper steel pipe 42A) that is joined to the steel pipe pile 100 by grout filling and a portion of the external steel pipe 42 that is not grout-filled and is not joined to the steel pipe pile 100. (Lower steel pipe 42B) is separably connected. By disconnecting the joint structure 48, the jacket 92 connected to the portion of the extrapolated steel pipe 42 (lower steel pipe 42B) that is not joined to the steel pipe pile 100 can be separated from the steel pipe pile 100. ..

In the joint structure 41 according to the third embodiment, a grout seal 22 (see FIGS. 26 to 28) is provided at the lower end of the grout filling portion 44, and the range of the grout filling portion 44 and the separation portion at the time of removal are provided. The range of 46 is clearly separated. As shown in FIGS. 26 to 28, the grout seal 22 is provided slightly above the joint structure 48, and the joint structure 48 is included in the region of the separation portion 46 at the time of removal. As described in the first and second embodiments, the adjustment of the position of the grout filling portion does not necessarily require the use of the grout seal.

The joint structure 48 has a longitudinally orthogonal flange portion 48A as a first connecting structure having flange surfaces 48A1 and 48A2 orthogonal to the longitudinal direction of the external steel pipe 42 so as to face each other, and is below the longitudinally orthogonal flange portion 48A. The longitudinal orthogonal flange portion 48B and the longitudinal orthogonal flange portion 48A as a second connecting structure having flange surfaces 48B1 and 48B2 arranged at the above positions and orthogonal to the longitudinal direction of the external steel pipe 42 so as to face each other. It has an intermediate member 48C which is a portion between the and 48B, and is arranged so as to cover the outer peripheral surface of the steel pipe pile 100 from the outside.

In the longitudinal orthogonal flange portion 48A, the opposing flange surfaces 48A1 and 48A2 are in contact with each other and are connected by bolts 48A3, and in the longitudinal orthogonal flange portion 48B, the opposing flange surfaces 48B1 and 48B2 are in contact with each other. It is connected by bolts 48B3.

The intermediate member 48C has two circumferentially orthogonal flange portions 48D having flange surfaces 48D1 and 48D2 orthogonal to the circumferential direction of the extrapolated steel pipe 42 at two positions at intervals in the circumferential direction of the extrapolated steel pipe 42. In each of the two circumferentially orthogonal flange portions 48D, the flange surfaces 48D1 and 48D2 facing each other are in contact with each other and are connected by bolts 48D3. As described above, the intermediate member 48C is composed of two semicircular members 48C1 and 48C2 having a semicircular cross section as a plurality of members joined by bolts 48D3 at two circumferential orthogonal flange portions 48D. (See FIG. 25).

The intermediate member 48C can be removed, and the outer peripheral surface of the steel pipe pile 100 covered by the intermediate member 48C can be exposed by removing the intermediate member 48C. The intermediate member 48C can be removed by removing the bolt 48A3 of the longitudinal orthogonal flange portion 48A, removing the bolt 48B3 of the longitudinal orthogonal flange portion 48B, and removing the bolt 48D3 of the two circumferential orthogonal flange portions 48D. ..

By removing the intermediate member 48C, the connection by the joint structure 48 is released. When the intermediate member 48C is removed, the force for pulling out the steel pipe pile 100 upward is not transmitted to the jacket 92. Therefore, even if the steel pipe pile 100 is pulled out together with the grout filling portion 44 and removed, the force is not transmitted to the jacket 92.

Therefore, by removing the intermediate member 48C of the joint structure 48, the steel pipe pile 100 can be pulled out together with the grout filling portion 44 and removed, and then the jacket 92 can be removed in sequence.

Further, when the intermediate member 48C of the joint structure 48 is removed, the outer peripheral surface of the steel pipe pile 100 is exposed to the outside, so that the exposed outer peripheral surface of the steel pipe pile 100 can be easily cut in the transverse direction. be able to. By cutting the exposed outer peripheral surface of the steel pipe pile 100 in the transverse direction, the jacket 92 can be raised and removed before the steel pipe pile 100 embedded in the bottom ground 102 is pulled out and removed. It will be possible.

(3-2) Structure of Pile-type Structure According to Third Embodiment The pile-type structure 50 according to the third embodiment of the present invention is a substructure of the offshore wind power generation facility 96 as shown in FIG. 22. ..

As shown in FIGS. 23 and 24, the pile-type structure 50 according to the third embodiment includes a joint structure 41 in which an external steel pipe 42 and a steel pipe pile 100 are joined by a grout 14 (see FIG. 28). The jacket 92 and the joint structure 41 are connected to each other via a connecting steel material 94.

(3-3) Method for constructing a joint structure between a steel pipe pile and a jacket according to a third embodiment FIGS. 26 to 28 show a procedure for constructing a joint structure between a steel pipe pile and a jacket according to a third embodiment of the present invention. Is a diagram schematically showing

Hereinafter, the method for constructing the joint structure according to the third embodiment of the present invention will be described in steps with reference to FIGS. 26 to 28 and the like. FIGS. 26 to 28 are representative of the main steps. It is a diagram schematically showing only the states, and does not necessarily represent all the states in each step.

<Step S51>
The jacket 92 (see FIGS. 22 and 23) is transported to the planned installation point by a pontoon (not shown).

<Step S52>
If necessary, level the jacket 92 on the bottom ground 102 at the planned installation point, and then lift the jacket 92 with a crane (not shown) on the pontoon (not shown) on the bottom ground 102 at the planned installation point. The jacket 92 is sunk at a predetermined position of (see FIG. 26). An extrapolated steel pipe 42 is attached to the leg 92A of the jacket 92 in advance via a connecting steel material 94 (upper flange 94A, lower flange 94B, web 94C) at the factory. Is also placed in place. The extrapolated steel pipe 42 is in a state of being connected by the joint structure 48.

<Step S53>
After the jacket 92 is sunk at a predetermined position at the planned installation point, the steel pipe pile 100 is placed in the extrapolated steel pipe 42 connected to the jacket 92, and the steel pipe pile 100 is driven into the submerged ground 102 to a predetermined depth. (See FIG. 27). Since the extrapolated steel pipe 42 connected to the jacket 92 also serves as a template, it is not necessary to use the template when arranging the steel pipe pile 100.

<Step S54>
The grout 14 is filled in the gap 16 between the inner surface of the extrapolated steel pipe 42 and the outer surface of the steel pipe pile 100 (see FIG. 28). The grout 14 is filled in the gap 16 above the grout seal 22. Further, the grout 14 is filled in the gap 16 until the grout 14 flows out from the upper part of the extrapolated steel pipe 42, and the grout 14 is sufficiently filled up to the upper end of the extrapolated steel pipe 42. Therefore, the range of the grout filling portion 44 is the range from the upper end of the grout seal 22 to the upper end of the extrapolated steel pipe 42.

When the cured grout 14 is cured and a predetermined strength is developed, the construction of the bonded structure is completed.

(3-4) Method for constructing pile-type structure according to the third embodiment For all of the external steel pipes 42 connected to the jacket 92, the above-mentioned "(3-3) Steel pipe piles and jacket according to the third embodiment". By carrying out the procedure of steps S51 to S54 of "Method of constructing the joint structure of the above", the pile type structure 50 (see FIGS. 22 and 23) according to the third embodiment can be constructed.

(3-5) Method for Removing Pile-type Structure According to Third Embodiment The method for removing the pile-type structure according to the third embodiment of the present invention is the method for removing the pile-type structure according to the third embodiment of the present invention. Is a way to remove.

28 to 33 are diagrams schematically showing a typical state of each step in the method for removing the pile-type structure according to the third embodiment of the present invention, and in each diagram, the portion of the joint structure is enlarged. It is a vertical cross-sectional view (cross-sectional view cut in a vertical plane passing through the central axis of the extrapolated steel pipe 42).

Hereinafter, the method for removing the pile-type structure according to the third embodiment of the present invention will be described in steps with reference to FIGS. 28 to 33 and the like. FIGS. 28 to 33 are representatives of the main steps. It is a diagram schematically showing only a typical state, and does not necessarily represent all the states in each step. Further, FIG. 28 is a diagram used in the explanation of the method of constructing the joint structure of the steel pipe pile and the jacket according to the third embodiment, and also in the explanation of the method of removing the pile type structure according to the third embodiment. I am using it.

<Step S61>
FIG. 28 is a vertical cross-sectional view (cross-sectional view cut in a vertical plane passing through the central axis of the extrapolated steel pipe 42) showing an enlarged portion of the joint structure of the pile-type structure 50 before the start of the removal work. As shown in FIG. 28, the pile type structure 50 is fixed to the bottom ground 102 in a stable state.

<Step S62>
As shown in FIG. 29, the intermediate member 48C of the joint structure 48 is removed.

Since the separation portion 46 at the time of removal of the joint structure according to the third embodiment is located above the bottom ground 102, the intermediate member 48C of the joint structure 48 can be removed without digging up the bottom ground 102. be able to.

With the completion of this step S62, the force for pulling out the steel pipe pile 100 upward is not transmitted to the jacket 92. Therefore, even if the steel pipe pile 100 is pulled out together with the grout filling portion 44 and removed, the force is not transmitted to the jacket 92. Therefore, at this stage, the steel pipe pile 100 can be pulled out upward together with the grout filling portion 44 and removed. This removal method will be described in "(3-6) Modification of the removal method of the pile-type structure according to the third embodiment" as a modification of the removal method of the pile-type structure according to the third embodiment.

<Step S63>
By removing the intermediate member 48C of the joint structure 48 in step S62, the outer peripheral surface of the steel pipe pile 100 at that portion is exposed to the outside. In this step S63, the exposed outer peripheral surface of the steel pipe pile 100 is cut in the transverse direction (see FIG. 30).

As a result, the pile head 100C of the steel pipe pile 100, together with the grout filling portion 44, is the main body portion of the steel pipe pile 100 embedded in the bottom ground 102 (the portion of the steel pipe pile 100 other than the pile head 100C. , It will be referred to as the steel pipe pile main body 100D).

The cutting method used for this cutting is not particularly limited, and any cutting method capable of safely performing cutting work can be adopted. For example, low-cost fusing can be used. It is also possible to cut with a wire saw if the environment allows the use of a wire saw.

<Step S64>
With the completion of step S63, the pile head 100C including the grout filling portion 44 is separated from the steel pipe pile main body 100D embedded in the jacket 92 and the bottom ground 102 (see FIG. 30), so that the pile head 100C can be easily removed. It is in a state of being. Therefore, as shown in FIG. 31, in this step S64, the pile head 100C including the grout filling portion 44 is removed.

<Step S65>
After completing the removal of the pile head 100C including the grout filling portion 44 in step S64, the jacket 92 is lifted upward and removed in this step S65 as shown in FIG. 32.

<Step S66>
With the completion of step S65, the removal of the jacket 92 is completed, and only the portion of the steel pipe pile main body 100D excluding the pile head 100C is left in the bottom ground 102. Therefore, as shown in FIG. 33, in this step S66, the steel pipe pile main body 100D left in the bottom ground 102 is pulled out from the bottom ground 102 and removed.

Since the separation portion 46 at the time of removal of the joint structure according to the third embodiment is located above the bottom ground 102, the cutting position of the steel pipe pile 100 is above the bottom ground 102 and is left in the bottom ground 102. The upper end of the steel pipe pile main body 100D is in a state of protruding from the bottom ground 102. Therefore, in this step S66, when the steel pipe pile main body 100D left in the bottom ground 102 is pulled out from the bottom ground 102, chucking is easy to be performed, and the pulling work is easy to be performed.

(3-6) Modification example of the method for removing the pile-type structure according to the third embodiment A modification example of the method for removing the pile-type structure according to the third embodiment of the present invention is described in "(3-5)". As described in the final paragraph of step S62 of "Method for removing pile-type structure according to the third embodiment", after step S62 of the method for removing pile-type structure according to the third embodiment, the steel pipe pile 100 is grouted. It is a removal method in which the filling portion 44 is pulled upward and removed, and is a removal method in which the steel pipe pile 100 is not cut. Further, it is a method of removing the jacket 92 after pulling out and removing the steel pipe pile 100, and the order of removing the steel pipe pile 100 and the jacket 92 is opposite to the method of removing the pile type structure according to the third embodiment. It has become.

28, 29, 34, and 35 are diagrams schematically showing typical states of each step in a modified example of the method for removing a pile-type structure according to a third embodiment of the present invention. Both views are vertical cross-sectional views (cross-sectional views cut in a vertical plane passing through the central axis of the extrapolated steel pipe 42) showing a portion of the joint structure in an enlarged manner. In addition, FIGS. 28 and 29 are views used in the description of the method for removing the pile-type structure according to the third embodiment, and the description of a modified example of the method for removing the pile-type structure according to the third embodiment. It is also used in.

Hereinafter, a modified example of the method for removing the pile-type structure according to the third embodiment of the present invention will be described in steps with reference to FIGS. 28, 29, 34, 35 and the like. 29, 34, and 35 are diagrams schematically showing only typical states in the main steps, and do not necessarily represent all the states in each step.

<Step S71>
FIG. 28 is a vertical cross-sectional view (cross-sectional view cut in a vertical plane passing through the central axis of the extrapolated steel pipe 12) showing an enlarged portion of the joint structure of the pile-type structure 50 before the start of the removal work. As shown in FIG. 28, the pile type structure 50 is fixed to the bottom ground 102 in a stable state.

<Step S72>
As shown in FIG. 29, the intermediate member 48C of the joint structure 48 is removed.

Since the separation portion 46 at the time of removal of the joint structure according to the third embodiment is located above the bottom ground 102, the intermediate member 48C of the joint structure 48 can be removed without digging up the bottom ground 102. be able to.

With the completion of this step S72, the force for pulling out the steel pipe pile 100 upward is not transmitted to the jacket 92. Therefore, even if the steel pipe pile 100 is pulled out together with the grout filling portion 44 and removed, the force is not transmitted to the jacket 92.

<Step S73>
With the completion of step S72, the force for pulling out the steel pipe pile 100 upward is no longer transmitted to the jacket 92. Therefore, in the modified example of the method for removing the pile type structure according to the third embodiment, in step S73, As shown in FIG. 34, the steel pipe pile 100 is pulled out from the bottom ground 102 together with the grout filling portion 44 and removed.

Since the separation portion 46 at the time of removal of the joint structure according to the third embodiment is located above the bottom ground 102, the heads of the grout filling portion 44 and the steel pipe pile 100 are above the bottom ground 102. The heads of the grout filling portion 44 and the steel pipe pile 100 are in a state of protruding from the bottom ground 102. Therefore, in this step S73, when the grout filling portion 44 and the steel pipe pile 100 are pulled out from the bottom ground 102, chucking is easy to be performed, and the pulling out work is easy to be performed.

<Step S74>
After completing the removal of the grout filling portion 44 and the steel pipe pile 100 in step S73, the jacket 92 is lifted upward and removed in this step S74 as shown in FIG. 35.

(3-7) Effect of Third Embodiment In the joint structure 41 according to the third embodiment, the bolt connection of the joint structure 48 of the separation portion 46 at the time of removal of the extrapolated steel pipe 42 is released, and the intermediate member 48C is released. By removing the above, the outer peripheral surface of the steel pipe pile 100 can be easily exposed. Thereby, the connected jacket 92 can be easily removed.

Therefore, the method for removing the joint structure 41 according to the third embodiment, the pile type structure 50 according to the third embodiment, and the pile type structure according to the third embodiment (third embodiment of the present invention). According to the method for removing the pile-type structure 50 including the joint structure 41 according to the above), it is possible to facilitate the removal work of the pile-type structure.

(4) Fourth Embodiment (4-1) Joint structure of steel pipe pile and jacket according to the fourth embodiment FIG. 36 shows a portion of the joint structure between the steel pipe pile and the jacket according to the fourth embodiment of the present invention. It is an enlarged front view, and FIG. 37 is a cross-sectional view taken along the line XXXVII-XXXVII of FIG. 36. FIG. 38 is an exploded view viewed from the side schematically showing a state before mounting the joint structure 68 of the joint structure according to the fourth embodiment.

The joint structure according to the fourth embodiment is an embodiment in which the joint structure 68 is provided in the removal separation portion 66, which is a portion corresponding to the removal cut portion 20 of the joint structure according to the first embodiment. The points other than the matters related to the above are the same as those of the joint structure according to the first embodiment. Therefore, in the joint structure according to the fourth embodiment, in principle, the same reference numerals and names are used for the members and parts corresponding to the members and parts of the joint structure according to the first embodiment and having the same function. , The explanation is omitted in principle.

Further, since the joint structure according to the fourth embodiment is an embodiment in which the joint structure 48 of the joint structure according to the third embodiment is replaced with the joint structure 68, only the configuration of the joint structure 68 will be described in principle. , A pile-type structure provided with a joint structure 61 according to the fourth embodiment, a method for constructing a joint structure between a steel pipe pile and a jacket according to the fourth embodiment, and a joint structure 61 according to the fourth embodiment. The method for constructing the pile-type structure provided with the above, the method for removing the pile-type structure provided with the joint structure 61 according to the fourth embodiment, and the effect of the fourth embodiment will be described in the third embodiment. It will be replaced with the corresponding explanation of.

The joint structure according to the fourth embodiment of the present invention includes an external steel pipe 62 extrapolated to the steel pipe pile 100, and a grout 14 filled in the gap 16 between the steel pipe pile 100 and the external steel pipe 62. It is a joint structure in which the steel pipe pile 100 and the external steel pipe 62 are joined via the grout 14.

The joint structure 61 according to the fourth embodiment of the present invention includes a steel pipe pile 100 and an extrapolated steel pipe 62 extrapolated to the steel pipe pile 100, and the extrapolated steel pipe 62 is a connecting steel material welded to a jacket 92. It has a connection portion 63 with 94. The joint structure 61 according to the fourth embodiment is a joint structure in which the steel pipe pile 100 and the extrapolated steel pipe 62 are joined via a grout 14 filled in the gap 16 between the steel pipe pile 100 and the extrapolated steel pipe 62. Is.

The joint structure according to the fourth embodiment is a gap between the grout filling portion 64, which is a region where the grout 14 is filled in the gap 16 between the steel pipe pile 100 and the external steel pipe 62, and the steel pipe pile 100 and the external steel pipe 62. 16 is a region where the grout 14 is not filled, and is above the outer surface portion of the external steel pipe 62 connected to the upper flange 94A of the connecting steel material 94 (the upper end of the connecting portion 63 of the external steel pipe 62). It has a removal part 66 which is a region between the grout filling part 64 and the lower end of the grout filling part 64. Then, a joint structure 68 is provided in the separation portion 66 at the time of removal. The joint structure 68 includes a portion of the external steel pipe 62 (upper steel pipe 62A) that is joined to the steel pipe pile 100 by grout filling and a portion of the external steel pipe 62 that is not grout-filled and is not joined to the steel pipe pile 100. (Lower steel pipe 62B) is separably connected. By disconnecting the joint structure 68, the jacket 92 connected to the portion of the extrapolated steel pipe 62 (lower steel pipe 62B) that is not joined to the steel pipe pile 100 can be separated from the steel pipe pile 100. ..

The joint structure 68 is an outer fitting that fits the steel pipe side fitting portions 68A and 68B provided on the outer peripheral surfaces of the upper steel pipe 62A and the lower steel pipe 62B of the external steel pipe 62 and the steel pipe side fitting portions 68A and 68B. It includes an outer tightening member 68C provided with portions 68D and 68E, and a wire 68G for tightening the outer tightening member 68C by inserting a through hole 68F provided on a side surface of the outer tightening member 68C.

As shown in FIG. 37, the outer tightening members 68C are arranged at positions that divide the extrapolated steel pipe 62 into eight equal parts in the circumferential direction, and the joint structure 68 includes eight outer tightening members 68C. The eight outer tightening members 68C are arranged so that their respective outer fitting portions 68D and 68E are fitted to the steel pipe side fitting portions 68A and 68B. The upper steel pipe 62A and the lower steel pipe 62B of the extrapolated steel pipe 62 are formed by eight outer steel pipes 62B by tightening the eight outer steel pipes 68C by the wires 68G through which the through holes 68F of the eight outer tightening members 68C are arranged. They are connected via a tightening member 68C.

The outer tightening member 68C can be removed by loosening the wire 68G.

By removing the outer tightening member 68C, the connection by the joint structure 68 is released. When the outer tightening member 68C is removed, the force for pulling out the steel pipe pile 100 upward is not transmitted to the jacket 92. Therefore, even if the steel pipe pile 100 is pulled out together with the grout filling portion 64 and removed, the force is not transmitted to the jacket 92. ..

Therefore, by removing the outer tightening member 68C of the joint structure 68, the steel pipe pile 100 can be pulled out together with the grout filling portion 64 to be removed, and then the jacket 92 can be removed in sequence.

Further, when the outer tightening member 68C of the joint structure 68 is removed, the outer peripheral surface of the steel pipe pile 100 is exposed to the outside, so that it is easy to cut the exposed outer peripheral surface of the steel pipe pile 100 in the transverse direction. It can be carried out. By cutting the exposed outer peripheral surface of the steel pipe pile 100 in the transverse direction, the jacket 92 can be raised and removed before the steel pipe pile 100 embedded in the bottom ground 102 is pulled out and removed. It will be possible.

(5) Supplement In the present invention, the grout filled in the gap between the steel pipe pile and the extrapolated steel pipe is located at a predetermined position or higher above the upper end of the connection portion of the extrapolated steel pipe extrapolated to the steel pipe pile. Only substantially filled. That is, even if the grout is filled below the predetermined position, the filling is small and the joining required to join the steel pipe pile and the extrapolated steel pipe is from the predetermined position. It does not exclude a mode that does not substantially affect the effect of the present invention, such as a case where it is substantially obtained at the upper portion. Of course, in the process of filling the grout from above to the predetermined position, a mode in which the grout slightly leaks below the predetermined position is also not excluded.

11, 31, 41, 61 ... Joined structure 12, 32, 42, 62 ... External steel pipe 12A ... Spacer 12B ... External steel pipe upper part 12C ... External steel pipe lower part 12D ... Cutting part 13, 33, 43, 63 ... Connection Part 14 ... Flange 16 ... Gap 18, 34, 44, 64 ... Grout filling part 18A, 18B ... Sheer key 20 ... Cutting part at the time of removal 22 ... Flange seal 28, 50 ... Pile-type structure 32A, 42A, 62A ... Upper steel pipe 32B , 42B, 62B ... Lower steel pipes 36, 46, 66 ... Separation part at the time of removal 38, 48, 68 ... Joint structure 38A ... Flange part 38A1, 38A2, 48A1, 48A2, 48B1, 48B2, 48D1, 48D2 ... Flange surface 38B, 48A3, 48B3, 48D3 ... Bolts 48A, 48B ... Longitudinal orthogonal flange portion 48C ... Intermediate member 48C1, 48C2 ... Semi-circular member 48D ... Circumferential orthogonal flange portion 68A, 68B ... Steel pipe side fitting portion 68C ... Outer tightening member 68D , 68E ... Outer fitting 68F ... Through hole 68G ... Wire 90, 96 ... Offshore wind power generation equipment 92 ... Jacket 92A ... Leg 92B ... Mad mat 94 ... Connecting steel 94A ... Upper flange 94B ... Lower flange 94C ... Web 100 ... Steel pipe Flange 100A, 100C ... Pile head 100B, 100D ... Steel pipe Pile body 102 ... Underwater ground

Claims (21)

It has a steel pipe pile and an extrapolated steel pipe that is extrapolated to the steel pipe pile and a connection portion with a jacket is formed in a part thereof, and grout in the gap between the extrapolated steel pipe and the steel pipe pile to be extrapolated. It is a joint structure that is filled and joined.
A joint structure characterized in that the grout in the gap between the extrapolated steel pipe and the steel pipe pile is filled only upward from a predetermined position above the upper end of the connection portion of the extrapolated steel pipe. It has a steel pipe pile and an extrapolated steel pipe extrapolated to the steel pipe pile and partially formed with a connection portion with a jacket, and grout in the gap between the steel pipe pile and the extrapolated steel pipe. It is a joint structure that is filled and joined.
The grout in the gap between the extrapolated steel pipe and the steel pipe pile is filled only upward from a predetermined position above the upper end of the connection portion of the extrapolated steel pipe.
Further, a joint structure is provided between the upper end of the connection portion and the predetermined position where the grout is filled, and the joint structure is joined by the grout filled in the gap with the steel pipe pile. A joint characterized by separably connecting the portion of the external steel pipe and the portion of the external steel pipe in which the gap between the steel pipe pile is not filled with grout and is not joined by grout. Structure. The joint structure according to claim 2, wherein the joint structure has a flange portion in which flange surfaces orthogonal to the longitudinal direction of the extrapolated steel pipe are connected by a bolt. The joint structure is a first and second connection in which an intermediate member forming a part of the extrapolated steel pipe and another part of the extrapolated steel pipe located above and below the intermediate member are connected to the intermediate member. Has a structure and
The intermediate member is composed of a plurality of members joined by bolts and covers the outer peripheral surface of the steel pipe pile, and the outer peripheral surface of the steel pipe pile can be exposed by removing the intermediate member. The member and each of the first and second connecting structures are connected by bolts to the flange surfaces orthogonal to the longitudinal direction of the extrapolated steel pipe.
The intermediate member is detachably configured to be removable from the steel pipe pile by releasing the bolt connection between the intermediate member and the first and second connecting structures and releasing the bolt connection of the intermediate member. The joined structure according to claim 2. A pile-type structure comprising the joint structure according to any one of claims 1 to 4 and a jacket connected via a connecting member connected to a connecting portion of the extrapolated steel pipe. The jacket has a leg that extends downward, and the end of the leg is formed with a ground plane that can be installed on the bottom ground.
The pile-type structure according to claim 5, wherein a part of the leg and a connecting portion of the extrapolated steel pipe are connected via the connecting member, and the jacket is erected. The external insertion having a jacket, a steel pipe pile, and an external steel pipe extrapolated to the steel pipe pile and partially formed with a connecting portion connected to the jacket via a connecting member. A method for removing a pile-type structure in which the grout in the gap between the steel pipe and the steel pipe pile is filled only upward from a predetermined position above the upper end of the connection portion of the external steel pipe.
A portion of the extrapolated steel pipe between the upper end of the connecting portion and the predetermined position filled with grout is cut in the transverse direction, and the steel pipe pile is connected to the connecting portion via the connecting member. A method for removing a pile-type structure, which comprises an extrapolated steel pipe cutting step for separating the jacket from the above-mentioned jacket. The jacket has a leg that extends downward, and the end of the leg is formed with a ground plane that can be installed on the bottom ground.
The removal of the pile-type structure according to claim 7, wherein a part of the leg and a connecting portion of the extrapolated steel pipe are connected via a connecting member, and the jacket is erected. Method. A steel pipe pile cutting step of cutting a portion of the steel pipe pile between the upper end of the connection portion and the predetermined position filled with grout in the transverse direction.
After the external steel pipe cutting step and the steel pipe pile cutting step, the portion of the external steel pipe to which the jacket is connected via the connecting member is pulled out from the cut steel pipe pile, and the jacket is removed. Jacket removal process and
The method for removing a pile-type structure according to claim 7 or 8, wherein the pile-type structure is provided. The pile type according to claim 9, further comprising a steel pipe pile removing step of pulling out and removing a portion of the steel pipe pile that is at least partially embedded in the ground after the jacket removing step. How to remove the structure. The external steel pipe cutting step and the steel pipe pile cutting step are continuous cutting steps in which the external steel pipe and the steel pipe pile portion are continuously cut in the transverse direction with a wire saw to separate the steel pipe pile and the jacket. The method for removing a pile-type structure according to claim 9 or 10, wherein the pile-type structure is removed. After the extrapolated steel pipe cutting step, the steel pipe pile removing step of pulling out the steel pipe pile from the ground together with the portion of the extrapolated steel pipe to be grout-joined and removing the steel pipe pile.
After the steel pipe pile removing step, the jacket removing step of removing the jacket and the jacket removing step
The method for removing a pile-type structure according to claim 7 or 8, wherein the pile-type structure is provided. The external insertion having a jacket, a steel pipe pile, and an external steel pipe extrapolated to the steel pipe pile and partially formed with a connecting portion connected to the jacket via a connecting member. The grout in the gap between the steel pipe and the steel pipe pile is filled only upward from a predetermined position above the upper end of the connection portion of the external steel pipe, and the upper end of the connection portion and the grout are filled with the predetermined position. The gap between the external steel pipe portion joined by the grout filled in the gap with the steel pipe pile and the steel pipe pile is not filled with grout and is not joined by grout. On the other hand, it is a method for removing a pile-type structure having a joint structure for separably connecting the external steel pipe portion on which the connection portion is formed.
A pile type having an extrapolated steel pipe separation step for releasing the connection by the joint structure and separating the steel pipe pile and the jacket connected to the connecting portion via the connecting member. How to remove the structure. The joint structure has a flange portion in which flange surfaces orthogonal to the longitudinal direction of the external steel pipe are connected by bolts, and in the external steel pipe separation step, the bolt of the joint structure is removed and the flange portion is formed. The method for removing a pile-type structure according to claim 13, wherein the method is performed by breaking the connection in the above. After the extrapolated steel pipe separation step, the steel pipe pile removing step of pulling out the steel pipe pile from the ground together with the portion of the extrapolated steel pipe joined by grout and removing the steel pipe pile.
After the steel pipe pile removing step, the jacket removing step of removing the jacket and the jacket removing step
14. The method for removing a pile-type structure according to claim 14. A steel pipe pile cutting step of cutting the steel pipe pile from the inside in the transverse direction between the upper end of the connection portion and the predetermined position where the grout is filled.
After the external steel pipe separation step and the steel pipe pile cutting step, the portion of the external steel pipe to which the jacket is connected via the connecting member is pulled out from the cut steel pipe pile, and the jacket is removed. Jacket removal process and
After the jacket removing step, a steel pipe pile removing step of pulling out a part of the steel pipe pile in a state of being embedded in the ground from the ground and removing the steel pipe pile,
14. The method for removing a pile-type structure according to claim 14. The joint structure is a first and second connection in which an intermediate member forming a part of the external steel pipe and another part of the external steel pipe located above and below the intermediate member are connected to the intermediate member. The intermediate member has a structure and is composed of a plurality of members joined by bolts to cover the outer peripheral surface of the steel pipe pile, and the outer peripheral surface of the steel pipe pile can be exposed by removing the intermediate member. Further, each of the intermediate member and the first and second connecting structures has a structure in which flange surfaces orthogonal to the longitudinal direction of the external steel pipe are connected by bolts.
In the extrapolated steel pipe separation step, the intermediate member is disengaged by releasing the bolt connection between the intermediate member and the first and second connecting structures and releasing the bolt connection of the plurality of members constituting the intermediate member. The method for removing a pile-type structure according to claim 13, wherein the pile-type structure is removed from the steel pipe pile. A steel pipe pile cutting step of removing the intermediate member in the extrapolated steel pipe separation step and then cutting a portion of the outer peripheral surface of the steel pipe pile covered by the intermediate member in the transverse direction.
After the steel pipe pile cutting step, the jacket removing step of removing the jacket and the jacket removing step
After the jacket removing step, a steel pipe pile removing step of pulling out a part of the steel pipe pile in a state of being embedded in the ground from the ground and removing the steel pipe pile,
The method for removing a pile-type structure according to claim 17, wherein the pile-type structure is provided. A steel pipe pile removing step of removing the intermediate member in the extrapolated steel pipe separation step and then pulling out the steel pipe pile from the ground together with a grout-joined portion of the extrapolated steel pipe.
After the steel pipe pile removing step, the jacket removing step of removing the jacket and the jacket removing step
The method for removing a pile-type structure according to claim 17, wherein the pile-type structure is provided. A steel pipe pile cutting step of cutting a portion of the steel pipe pile between the upper end of the connection portion and the predetermined position filled with grout in the transverse direction.
After the external steel pipe separation step and the steel pipe pile cutting step, the portion of the external steel pipe to which the jacket is connected via the connecting member is pulled out from the cut steel pipe pile, and the jacket is removed. Jacket removal process and
The method for removing a pile-type structure according to any one of claims 13, 14 and 17. The pile type according to claim 20, further comprising a steel pipe pile removing step of pulling out and removing a portion of the steel pipe pile in a state of being embedded in the ground after the jacket removing step. How to remove the structure.

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