JP2005133485A - Construction method of jacket structural body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction method of a jacket structural body capable of constructing the jacket structural body on the sea having the sky limitation. <P>SOLUTION: A plurality of foundation piles 3 are installed in the area 7 of the sea, outer insertion pipes 12 forming divided jacket structural bodies 11 consisting of the jacket structural bodies 1 divided into the plural number in the vertical direction are inserted and installed in the foundation piles 3, each outer insertion pipe 12 is engaged with a collar section 2 put on the outer circumference of each foundation pile 3, the outer insertion pipe 12 forming each of the remaining divided jacket structural bodies 11 is inserted and installed in the foundation pile 3, after a ring-like projected stripe 14 provided to the inside space surface of the outer insertion pile 12 or a plurality of projections 15 have been engaged with the upper surface of the foundation pile 3, a bottom form 16 is installed in the outer circumference of the foundation pile 3 of the lower end of the outer insertion pipe 12, and a space between the outer insertion pipe 12 and the foundation pile 3 is filled with a filler 4 to form the construction method connecting the foundation pile 3 to the divided jacket structural body 11. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a construction method of a jacket structure that is installed in a water area to construct a structure.

  When constructing a pier at sea, it is common to use a jacket structure. Here, the jacket structure is a three-dimensional steel pipe truss structure in which steel pipe legs covering the steel pipe pile are joined with diagonal or horizontal material, and the factory manufactured jacket structure is connected and fixed to the steel pipe pile installed on the sea floor. Built. The jacket structure has increased rigidity due to the steel pipe truss structure, and the load of the superstructure can be effectively transmitted to the foundation pile by the truss frame.

  The jacket structure is integrally formed on land and towed to the construction point on a trolley. Normally, the jacket structure is installed on the already-placed temporary receiving pile, the main foundation pile is driven through the outer tube that constitutes the jacket structure, and mortar is placed between the main foundation pile and the outer tube, for example. Fill the jacket structure and main foundation pile to integrate.

Moreover, as disclosed in Patent Document 1, there is a method in which the vertical material d constituting the jacket structure b is inserted into the head of the foundation pile a, and then the grout material is filled into the head of the foundation pile a. By providing a locking material c in advance on the outer periphery of the vertical material d, the jacket structure b is temporarily locked in a state where the vertical material d is inserted into the head of the foundation pile a having a predetermined length. (See FIG. 9).
JP 7-216844 A

The conventional method for constructing a jacket structure has the following problems.
<1> In the construction method for placing a temporary receiving pile, the construction cost and construction period required for placing the temporary receiving pile affect the overall construction cost and the overall construction period.
<2> When the integrally formed jacket structure is towed by a carriage and suspended by a hoisting ship in a water area, it may be necessary to enlarge the hoisting ship according to the scale of the jacket structure.
<3> In a water area (sea area) with an upper limit, depending on the size of the jacket structure, there may arise a problem that the jacket structure cannot be lifted on the top of the already-found foundation pile.
<4> In a split jacket structure obtained by dividing the jacket structure vertically, when extrapolated tubes that are arranged adjacent to each other in the vertical direction are joined by field welding, a lot of construction time is required for welding. If the number of extratubation tubes increases according to the scale of the jacket structure, the required time will affect the construction period.

  In order to solve the above problems, a construction method of a jacket structure of the present invention is a construction method of a jacket structure that is installed in a water area to construct a structure, and a plurality of foundation piles are installed in the water area. And inserting and installing an outer insertion tube constituting the split jacket structure formed by dividing the jacket structure into a plurality of pieces in the vertical direction into the foundation pile, and engaging the outer insertion tube with a flange provided on the outer periphery of the foundation pile. The outer insertion tube constituting the remaining split jacket structure is inserted and installed in the foundation pile, and a ring-shaped protrusion or a plurality of protrusions provided on the inner surface of the outer insertion tube is provided at the top end of the foundation pile. After locking, a bottom mold is installed on the outer periphery of the foundation pile at the lower end of the outer tube, and a filler is filled between the outer tube and the foundation pile to join the foundation pile and the split jacket structure. A construction method of a jacket structure characterized in that .

  Further, the construction method of the jacket structure of the present invention is a construction method of a jacket structure that is installed in a water area to construct a structure, and a plurality of foundation piles are installed in the water area, and at the top end of the foundation pile. An outer tube insertion guide having a widened side view is installed, and an outer tube forming a split jacket structure obtained by dividing the jacket structure into a plurality of vertical directions is inserted and installed in the foundation pile, and the outer periphery of the foundation pile After the outer tube is locked to the heel portion provided for the filler, a filler is filled between the outer tube and the foundation pile, the outer tube insertion guide is removed from the top end of the foundation pile, and the remaining split jacket structure An extratubation tube constituting the body is inserted and installed in the foundation pile, and the outer tube is inserted after a ring-shaped protrusion or a plurality of projections provided on the inner surface of the outer insertion tube is locked to the top end of the foundation pile. After installing the bottom formwork around the foundation pile at the lower end of A method for constructing a jacket structure, characterized in that by filling a filling material between the outer intubation with said foundation pile joining the divided jacket structure and the foundation pile.

  Further, the construction method of the jacket structure of the present invention is a construction method of a jacket structure that is installed in a water area to construct a structure, and a plurality of foundation piles are installed in the water area, and at the top end of the foundation pile. An outer tube insertion guide having a widened side view is installed, and an outer tube forming a split jacket structure obtained by dividing the jacket structure into a plurality of vertical directions is inserted and installed in the foundation pile, and the outer periphery of the foundation pile The outer intubation tube is locked to the collar portion provided for the outer tube, the outer tube insertion guide is removed from the top end of the foundation pile, and the outer tube constituting the remaining split jacket structure is inserted and installed in the foundation pile, and the outer intubation tube A ring-shaped protrusion or a plurality of protrusions provided on the inner surface of the foundation pile is locked to the top end of the foundation pile, and then a bottom mold is installed on the outer periphery of the foundation pile at the lower end of the outer insertion pipe, and the outer insertion pipe And a filling material between the foundation pile and the A method for constructing a jacket structure, characterized by joining the divided jacket structure and Ishizuekui.

Further, the outer insertion tube insertion guide is installed while increasing the top end level of the outer insertion tube insertion guide in the order of the plurality of foundation piles arranged in parallel, and includes the outer tube insertion guide protruding to the highest level. The construction method of the jacket structure characterized by inserting the outer tube of the split jacket structure in order from the foundation pile can be used.

The method for constructing a jacket structure according to the present invention can obtain at least one of the following effects by means for solving the above-described problems.
<1> Since no temporary support pile is required, the construction cost can be reduced and the construction period can be shortened.
<2> Since the split jacket structure formed by dividing the jacket structure into a plurality of pieces is sequentially installed on the foundation pile, it is not necessary to increase the size of the hoist ship even when the scale of the jacket structure increases.
<3> In order to sequentially install the divided jacket structure formed by dividing the jacket structure into a plurality of foundation piles, a divided jacket structure according to the restriction even in a water area (sea area) with an upper limit. By manufacturing, it is possible to construct a jacket structure.
<4> Since it is not necessary to join the externally inserted tubes of the split jacket structure disposed above and below by on-site welding, the construction time (construction period) required for on-site welding can be reduced, and the construction cost can be reduced. .

<1> Overall Configuration The present invention relates to a construction method of a jacket structure 1 that is installed in a water area 7 to construct a structure.
A split jacket structure 11 described later, which is obtained by dividing the jacket structure 1 manufactured on land into a plurality of stages in the vertical direction, is towed by a base boat and already installed in the water area 7 using a hoist ship 6 or the like. It installs in the foundation pile 3 made (refer FIG. 1). Here, the outer insertion tube 12 of the split jacket structure 11 (which constitutes the lower part of the jacket structure 1) to be installed first is inserted into the foundation pile 3 and prepared in advance on the outer periphery of the foundation pile 3 at a predetermined level of the foundation pile 3. It is good to lock it to the flange 2.
After the outer tube 12 is locked to the flange 2, the filler 4 is filled between the outer tube 12 and the foundation pile 3. The filling material 4 is filled by installing the two split jacket structures 11, 11 on the foundation pile 3, and then, at a stretch, the extrapolated pipes 12, 12 of the upper and lower split jacket structures 11, 11 and the foundation pile 3. It may be filled in between.
Next, the remaining split jacket structure 11 is installed. Here, a ring-shaped protrusion 14 or a plurality of protrusions 15, 15 are provided on the inner hollow surface of the outer tube 12 of the remaining split jacket structure 11, and the ring-shaped protrusion 14 or the protrusion 15 is provided. The top of the foundation pile 3 is locked. Thereafter, the bottom mold 16 is installed on the outer periphery of the foundation pile 3 at the lower end of the outer insertion tube 12, and the filler 4 is filled between the outer insertion tube 12 and the foundation pile 3.

The height of the split jacket structure 11 is determined in consideration of the upper limit, the overall height of the jacket structure 1, the top height of the foundation pile 3, and the like. That is, the height of each divided jacket structure 11 can be determined from the above elements.
By dividing the jacket structure 1 into a plurality of parts, it is possible to install the jacket structure 1 without being affected by the restriction on the sky. By dividing the jacket structure 1, the weight suspended by the hoist ship 6 can be increased. Since this can be reduced, the necessity of increasing the scale of the hoist ship 6 according to the scale of the jacket structure 1 is eliminated.
Moreover, in this invention, it is not set as the structure which weld-joins several division | segmentation jacket structures 11 and 11 mutually. That is, since the divided jacket structures 11 and 11 are joined to the foundation pile 3 independently to constitute the jacket structure 1 as a whole, the divided jacket structures 11 and 11 are joined to each other by field welding or the like. Not what you want. Therefore, the construction time required for field welding can be omitted, and the construction cost can be reduced.

<2> Divided Jacket Structure The divided jacket structure 11 is a divided jacket structure when the jacket structure 1 is divided into a plurality of pieces in the vertical direction, for example. Here, to divide in the vertical direction means to cut and divide the jacket structure 1 in the horizontal direction in the middle of its height. For example, when the jacket structure 1 is divided into two parts, the jacket structure 1 is divided in the horizontal direction near the center of the height of the jacket structure 1, and a plurality of extrapolated tubes 12 and horizontal members are provided for each of the upper and lower divided jacket structures 11, 11. The diagonal members are connected to form solid steel pipe truss structures.
The divided upper and lower divided jacket structures 11, 11 are configured by connecting the outer insertion tubes 12, 12 provided in the respective divided jacket structures 11, 11 to the foundation pile 3. Here, the external insertion tubes 12 and 12 of the split jacket structures 11 and 11 are not joined by field welding. This is because one of the objects of the present invention is to eliminate the field welding.

  For example, among the split jacket structure 11 divided into two, the ring-shaped protrusion 14 or a plurality of protrusions to be described later is formed on the inner surface of the outer insertion tube 12 constituting the split jacket structure 11 that is finally installed on the foundation pile 3. 15 and 15 are preferably prepared. After installing the divided jacket structure 11 to be installed first on the foundation pile 3, the outside of the divided jacket structure 11 to be installed next to the top end of the foundation pile 3 protruding from the outer tube 12 constituting the divided jacket structure 11. This is because the intubation 12 can be locked.

It is preferable to provide a plurality of suspension pieces 13 that can be suspended by the hoist ship 6 on the horizontal member disposed above the split jacket structure 11.

<3> Buttocks (Figure 3)
The eaves part 2 is a ring-shaped plate material provided on the outer periphery of the foundation pile 3 at a predetermined level of the foundation pile 3, and can be manufactured by, for example, a steel material.
The outer diameter of the collar portion 2 is manufactured to be larger than at least the inner diameter of the outer insertion tube 12. As for the attachment of the heel part 2 to the foundation pile 3, there is a method in which the foundation pile 3 is fitted to the ridge part 2 manufactured in a ring shape and welded to the surface of the foundation pile 3 at a desired level. Further, there is a method in which a half split saddle portion obtained by dividing the ring shape into two parts is brought into contact with the foundation pile 3 interposed therebetween, the contact part is welded, and the flange part 3 and the foundation pile 3 are also welded and attached.
As described above, the flange 2 is preferably welded to the surface of the foundation pile 3 and supported by a plurality of brackets 8 provided below the flange.

One of the purposes of providing the flange portion 2 is to lock the lower end of the outer tube 12 of the split jacket structure 11 to be installed first at a desired level. Another purpose is to close the gap 9 between the extratubation tube 12 and the foundation pile 3 with the flange 2, thereby serving as a bottom mold when the gap 9 is filled with a filler 4 such as mortar. That is.

<4> Extratubation Insertion Guide The extratubation insertion guide 5 is a guide installed at the top end of the foundation pile 3 in order to make it easy to insert the outer insertion tube 12 into the foundation pile 3. The outer tube insertion guide 5 is preferably manufactured such that the side view is widened toward the end. That is, a steel plate material 51 having a shape that spreads downward (triangle, trapezoid, etc.) and plate materials 52, 52 formed by dividing the steel plate material 51 into two at the center line perpendicular to both surfaces of the plate material surface. The outer tube insertion guide 5 can be manufactured by welding or the like (see FIG. 8).
Alternatively, for example, a truncated cone-shaped frame structure may be formed from L-shaped steel, and a steel plate material may be installed on the surface of the frame structure to form the extratubation insertion guide 5 (not shown).
By hooking the wire 200 on the shackle 100 provided at the top end of the outer tube insertion guide 5, it is possible to perform the refilling operation while lifting the outer tube insertion guide 5 through the wire 200 on the hoist ship 6. Become.

After the outer tube insertion guide 5 is installed at the top end of the foundation pile 3, the outer tube 12 constituting the first split jacket structure 11 is inserted and installed in the foundation pile 3 while using the outer tube insertion guide 5 as a guide.
Next, when inserting the outer insertion tube 12 of the split jacket structure 11 to be installed into the foundation pile 3, the outer insertion tube insertion guide 5 is removed from the top end of the foundation pile 3.

It is preferable to install the outer insertion tube insertion guide 5 while increasing the top end level of the outer insertion tube insertion guide 5 in the order of the plurality of foundation piles 3 and 3 arranged in parallel. When inserting and installing the plurality of outer insertion tubes 12 and 12 constituting the split jacket structure 11 into the foundation piles 3 and 3, the outer insertion tube insertion guide 5 having the highest top level (the foundation pile 3 provided with) is sequentially installed. It is because the installation of the outer intubation tube 12 to the foundation pile 3 is facilitated by performing the insertion installation of the outer intubation tube 12.

<5> Projections and projections (FIGS. 6 and 7)
Of the split jacket structures 11, 11 obtained by dividing the jacket structure 1 into two, ring-shaped protrusions 14 or 14 are formed on the inner surface of the outer insertion tube 12 constituting the split jacket structure 11 that is finally installed on the foundation pile 3. A split jacket structure 11 is manufactured with a plurality of protrusions 15.
The inner diameter of the ring-shaped protrusion 14 is manufactured so as to be at least smaller than the outer diameter of the foundation pile 3. Although the cross-sectional shape of the protrusion 14 cut perpendicularly to the ring direction can be variously selected such as a rectangle or a trapezoid, at least the lower surface thereof is preferably manufactured horizontally. This is because the purpose of installing the protrusion 14 is to lock the lower surface to the top end of the foundation pile 3.
When the plurality of projections 15 and 15 are provided on the inner space of the outer tube 12, the projection length of the projection 15 toward the inner space (the pseudo formed of the projecting tips of the plurality of projections 15 and 15 toward the inner space). The inner diameter) is manufactured so as to be at least smaller than the outer diameter of the foundation pile 3. The cross section in the ring direction of the protrusion 15 can be variously selected such as a rectangle or a trapezoid like the protrusion 14 described above, but at least the lower surface of the protrusion 15 is preferably manufactured horizontally.

After the outer insertion tube 12 of the split jacket structure 11 to be installed last is locked to the top end of the foundation pile 3, the bottom mold 16 is installed on the outer periphery of the foundation pile 3 at the lower end of the outer insertion tube 12. .
Here, for example, the bottom mold 16 may be a ring body formed by halving a ring-shaped mold and connected at the site. For example, a rubber packing may be provided on the upper surface of the ring body (the surface closing the gap 9). Furthermore, although not shown, by providing a filling hole capable of filling the filler 4 at a position that leads to the gap 9, the filler 4 can be filled via the bottom mold 16.

An example of the construction method of the jacket structure 1 of the present invention will be described below with reference to the drawings.
A plurality of foundation piles 3 and 3 are installed in a water area 7, for example, at sea. A foundation pile 3 such as a steel pipe pile can be driven at a predetermined position in the water area 7 by a pile driving boat.

  A plurality of split jacket structures 11, 11 manufactured on land are towed by a trolley, and the split jacket structures 11 are installed on the foundation pile 3 while being suspended using a hoist ship 6 (see FIG. 1). ). Here, the split jacket structure 11 is installed by inserting and installing a plurality of external insertion tubes 12 and 12 constituting the split jacket structure 11 into the foundation piles 3 and 3 and installing them at predetermined levels of the respective foundation piles 3 and 3. The extratubation tubes 12 and 12 are engaged with the flanges 2 and 2 (see FIG. 2).

Here, when installing the split jacket structure 11 on the foundation pile 3, it is preferable to install the outer insertion tube insertion guide 5 in advance at the top end of the foundation pile 3. The extratubation insertion guide 5 is preferably installed while increasing the top end level of the extratubation insertion guides 5 and 5 in the order of the plurality of foundation piles 3 and 3 arranged in parallel. For example, when 9 foundation piles 3 arranged in 3 rows and 3 columns are arranged, the top end level of the external insertion tube insertion guide 5 is gradually increased (lowered) for each row and installed at the top end of the foundation pile 3 To do.
After installing the outer tube insertion guide 5, the outer tube 12 of the split jacket structure 11 is inserted and installed in the foundation pile 3 in order from the foundation pile 3 provided with the outer tube insertion guide 5 protruding to the highest level.

  Next, the split jacket structure 11 installed above the split jacket structure 11 described above is installed on the foundation pile 3. FIG. 4 shows a situation where an upper divided jacket structure 11 obtained by dividing the jacket structure 1 into two upper and lower stages is suspended. In the installation of the split jacket structure 11 to the foundation pile 3, the top end of the foundation pile 3 protrudes from the outer tube 12.

  Here, when the external insertion tube insertion guide 5 is installed at the top end of the foundation pile 3, the external insertion tube insertion guide 5 is removed from the top end of the foundation pile 3 before the installation of the split jacket structure 11 to be installed next. Keep it.

Next, the outer tube 12 constituting the split jacket structure 11 to be installed is inserted and installed in the foundation pile 3, and the outer tube 12 is foundationed by the ridge 14 or the protrusion 15 provided on the inner surface of the outer tube 12. The top of the pile 3 is locked.
After the outer insertion tube 12 is locked to the top end of the foundation pile 3, the bottom mold 16 is installed on the outer periphery of the foundation pile 3 at the lower end of the outer insertion tube 12 (see FIG. 5).
After the installation of the bottom mold 16, the filler 4 such as mortar is filled between the outer insertion tube 12 and the foundation pile 3 (gap 9). Here, as for the filling of the filler 4, the two split jacket structures 11, 11 are filled after being installed on the foundation pile 3 (that is, after the split jacket structure 11 to be installed first is installed, the filler 4 is filled). And filling the filler 4 after the next split jacket structure 11 is installed), or after the two split jacket structures 11 and 11 are installed on the foundation pile 3, the filler 4 Can also be filled.
The filling material 4 is filled by filling from the filling hole provided in the outer insertion tube 12, the filling hole provided in the bottom mold 16, and the filling hole provided in the flange 2, and the upper divided jacket structure 11. It is also possible to perform filling from the top end of the outer tube 12. Here, since the collar part 2 with which the foundation pile 3 was equipped plays the role of the bottom formwork at the time of filling with the filler 4, the possibility that the filler 4 leaks out from the bottom becomes very low.
Curing of the filler 4 completes the joining of the jacket structure 1 composed of the plurality of divided jacket structures 11, 11 and the plurality of foundation piles 3, 3.

The side view explaining the situation which has installed the split jacket structure in a foundation pile. The side view explaining the situation where the extratubation tube of the division | segmentation jacket structure was latched to the collar part. The perspective view which expanded the collar part. The side view explaining the condition which has installed the remaining division | segmentation jacket structure in a foundation pile. The side view explaining the situation where the installation to the foundation pile and the installation of the bottom formwork of the remaining split jacket structure were completed. The perspective view explaining the protrusion provided in the division | segmentation jacket structure. The perspective view explaining the protrusion with which the division | segmentation jacket structure was equipped. The side view which expanded the external intubation insertion guide. The side view explaining the construction method of the conventional jacket structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Jacket structure 11 ... Divided jacket structure 12 ... External insertion tube 14 ... Rib 15 ... Projection 16 ... Bottom mold frame 2 ... Saddle 3 ... Foundation pile 4 ... Filler 5 ... Extratubation insertion guide 7 ... Water area

Claims (4)

A construction method of a jacket structure that is installed in a water area to construct a structure,
Multiple foundation piles in the water area,
Inserting and installing an outer tube that constitutes a divided jacket structure formed by dividing the jacket structure into a plurality of pieces in the vertical direction into the foundation pile, and locking the outer tube to a flange provided on the outer periphery of the foundation pile. ,
Inserting and installing the outer insertion tube constituting the remaining split jacket structure into the foundation pile, and locking the ring-shaped protrusion or the plurality of protrusions provided on the inner surface of the outer insertion tube to the top end of the foundation pile. After installing a bottom formwork on the outer periphery of the foundation pile at the lower end of the outer tube,
Filling a filler between the extrapolation tube and the foundation pile to join the foundation pile and the split jacket structure,
Construction method of jacket structure.
A construction method of a jacket structure that is installed in a water area to construct a structure,
Multiple foundation piles in the water area,
Install an external intubation insertion guide whose side view is widened at the top end of the foundation pile,
Inserting and installing an outer tube that constitutes a divided jacket structure formed by dividing the jacket structure into a plurality of pieces in the vertical direction into the foundation pile, and locking the outer tube to a flange provided on the outer periphery of the foundation pile. After that, a filler is filled between the outer tube and the foundation pile,
Removing the outer tube insertion guide from the top of the foundation pile;
Inserting and installing the outer insertion tube constituting the remaining split jacket structure into the foundation pile, and locking the ring-shaped protrusion or the plurality of protrusions provided on the inner surface of the outer insertion tube to the top end of the foundation pile. After the bottom mold is installed on the outer periphery of the foundation pile at the lower end of the outer insertion tube, a filler is filled between the outer insertion tube and the foundation pile to join the foundation pile and the split jacket structure. Characterized by the
Construction method of jacket structure.
A construction method of a jacket structure that is installed in a water area to construct a structure,
Multiple foundation piles in the water area,
Install an external intubation insertion guide whose side view is widened at the top end of the foundation pile,
Inserting and installing an outer tube that constitutes a divided jacket structure formed by dividing the jacket structure into a plurality of pieces in the vertical direction into the foundation pile, and locking the outer tube to a flange provided on the outer periphery of the foundation pile. ,
Removing the outer tube insertion guide from the top of the foundation pile;
Inserting and installing the outer insertion tube constituting the remaining split jacket structure into the foundation pile, and locking the ring-shaped protrusion or the plurality of protrusions provided on the inner surface of the outer insertion tube to the top end of the foundation pile. After installing a bottom formwork on the outer periphery of the foundation pile at the lower end of the outer tube,
Filling a filler between the extrapolation tube and the foundation pile to join the foundation pile and the split jacket structure,
Construction method of jacket structure.
The outer tube insertion guide according to claim 2 or 3 is installed while increasing the top end level of the outer tube insertion guide in order of the plurality of foundation piles arranged in parallel,
In order from the foundation pile provided with the outer tube insertion guide protruding to the highest level, the outer tube of the split jacket structure is inserted,
Construction method of jacket structure.

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