WO2013084610A1

WO2013084610A1 - Steel plate cell and steel plate arc installation method and steel plate cell connector structure

Info

Publication number: WO2013084610A1
Application number: PCT/JP2012/077414
Authority: WO
Inventors: 忠明土屋; 成行竹内; 文雄中西
Original assignee: 日立造船株式会社
Priority date: 2011-12-06
Filing date: 2012-10-24
Publication date: 2013-06-13
Also published as: CN103958778B; JP5769608B2; CN103958778A; TW201326516A; TWI553193B; JP2013119696A

Abstract

A cylindrical shape is retained by attaching an internal periphery rib (25U) to an upper internal periphery surface of a first shell plate (24) of a first cell (21) among the first cell (21) and a second cell (31) divided into upper and lower stages, and a head reinforcing plate (26) is attached to the upper internal periphery surface of the first shell plate (24) and extends higher than the first shell plate (24). A plurality of adjustment slits extending toward the central axis of the shell are formed in the bottom part of a second shell plate (34) of the second cell (31) to allow a bottom edge part to deflect within a certain range. A plurality of guide pieces (27) externally fitted to the head reinforcing plate (26) for guiding the bottom edge part of the second shell plate (34) are attached to the internal surface of the head reinforcing plate (26) at a certain circumferential pitch, and a root gap (R) is formed between the top edge part of the first shell plate (24) and the bottom edge part of the second shell plate (34) to allow circumferential welding from the external periphery with the head reinforcing plate (26) acting as backing material.

Description

Steel plate cell / arc arc installation method and steel plate cell connection structure

The present invention installs steel plate cells / arcs by placing them into the ground such as the seabed, coast, revetment, quay, etc., and installing them to form harbors, marine structures such as revetments and breakwaters. The present invention relates to a construction method and a connection structure of a steel plate cell.

Steel plate cells that form marine structures such as seawalls and breakwaters are formed in a cylindrical shape such as a circle, ellipse, drum shape, or polygonal shape in plan view, and the steel plate arc that connects the steel plate cells is an arc shape. Etc. are formed respectively. Thereby, the tension | tensile_strength which opposes external forces, such as a wave, a tidal current, and rain water, and the intensity | strength for hold | maintaining an insert material are hold | maintained.

Such a steel plate cell / steel plate arc is generally formed by integrally assembling a plurality of outer shell bodies into a cylindrical shape in a ground work area near the installation site. For example, as shown in Patent Document 1, these outer shells are formed by connecting flanges formed on connecting edges with bolts, and as shown in Patent Document 2, assembled by circumferential welding or vertical welding. It is done.

By the way, as construction method to install offshore structure by steel plate cell / steel plate arc, “placement type” is to place steel plate cell / steel arc upright on the foundation formed by placing concrete on the bottom of the seabed. In addition, there is a “rooting type” in which steel plate cells and steel plate arcs are directly driven into the ground of the seabed in the form of piles.

When constructing an offshore structure with a “root-in type”, steel plate cells and steel arcs are assembled in the ground work area near the installation site, and these steel plate cells and steel plate arcs are transported to a predetermined installation site using a transport carrier and crane ship. Carry it, lift it with a large crane on a crane ship, sink it in place, and place it using a high-bro hammer.

JP-A-6-306833 JP 9-268873 A

In particular, steel plate cells and arcs installed on the shores of a bay are different from small ones such as rivers in many large ones with large diameters and high heights. In addition, the conventional steel plate cell / steel arc has an outer diameter of about 15 m to 25 m. However, the recent steel plate cell / steel arc has an outer diameter of 30 m to 50 m, which is high in large-scale landfill revetments, etc. overseas. Larger ones with a length of 30 to 60 m are required.

When the outer diameter and height of the steel plate cell and steel plate arc become sufficiently large in this way, 1) when transporting by trolley, 2) when manufacturing using a crawler crane with a high lift, etc. 3) When a steel plate cell or steel plate arc using a high crane with a carrier is placed, if there are height restrictions (for example, 50 m) on the aircraft flight line, power transmission line, and bridge, there is a risk that this cannot be cleared.

The present invention solves the above problems, and by dividing the steel plate cell and steel plate arc, it is possible to clear height restrictions during transportation, production, placement, etc. It aims at providing the installation method of the steel plate cell and steel plate arc which can be assembled and installed easily and accurately in a short time, and the connection part structure of a steel plate cell.

In order to solve the above problems, the installation method of the steel plate cell / steel arc according to claim 1 is:
After a plurality of steel plate cells formed in a cylindrical shape are driven into the ground at predetermined intervals, a steel plate arc is driven into the ground between the steel plate cells, the steel plate cells are connected to each other by the steel plate arc, and at least An installation method of a steel plate cell / steel arc filling the steel plate cell with an interstitial material,
The steel plate cell is composed of a first cell and a second cell,
A cylindrical first trunk plate for forming the first cell is driven into the ground along the trunk axis direction,
A cylindrical second member that suspends the second cell from above the first cell and forms the second cell on a connection member attached to an inner peripheral surface or an outer peripheral surface at an upper end portion of the first body plate. Fit the body plate, connect the second cell on the first cell,
The upper end portion of the first body plate and the lower end portion of the second body plate are joined by circumferential welding.

The installation method of the steel plate cell / steel arc according to claim 2 is:
After a plurality of steel plate cells formed in a cylindrical shape are driven into the ground at predetermined intervals, a steel plate arc is driven into the ground between the steel plate cells, the steel plate cells are connected to each other by the steel plate arc, and at least An installation method of a steel plate cell / steel arc filling the steel plate cell with an interstitial material,
The steel plate cell is composed of a first cell, an intermediate cell, and a second cell,
The cylindrical first body plate forming the first cell is driven into the ground along the trunk axis direction,
A cylindrical intermediate body plate that forms the intermediate cell is attached to a connection member attached to an inner peripheral surface or an outer peripheral surface at an upper end portion of the first body plate, hanging above the first cell or the intermediate cell. Fitting, connecting the intermediate cell on the first cell,
The upper end portion of the first body plate and the lower end portion of the intermediate body plate are joined by circumferential welding,
An intermediate cell is formed by fitting a lower end portion of a cylindrical second body plate forming the second cell to an intermediate connection member attached to an inner peripheral surface or an outer peripheral surface of the intermediate body plate at an upper end portion of the intermediate cell. Connect the second cell to the top of
The upper end portion of the intermediate body plate and the lower end portion of the second body plate are joined by circumferential welding.

The connection structure of the steel plate cell / steel plate arc according to claim 3 is:
A plurality of cylindrical steel plate cells that are driven and penetrated into the ground along the trunk axis direction and are connected to each other by a steel plate arc,
The steel plate cell is a two-stage steel plate cell composed of a first cell penetrating into the ground at the installation site and a second cell connected to the upper end of the first cell, or the first cell penetrating into the ground at the installation site. 1 cell and an intermediate cell connected to the upper end of the first cell, and a three-stage steel plate cell consisting of the second cell connected to the upper end of the intermediate cell, the first cell and the second cell A connection portion structure of the first cell and the intermediate cell, and the connection portion structure of the intermediate cell and the second cell,
An inner peripheral rib for holding the shape of the lower-stage cell is attached to an upper inner peripheral surface of a cylindrical lower-stage body plate that forms the lower-stage cell that is the first cell or the intermediate cell, and the lower-stage cylinder A head reinforcing member is attached to the inner peripheral surface of the upper end of the plate, with the upper end protruding upward from the upper end of the lower body plate,
In the lower part of the cylindrical upper body plate forming the upper cell that is the intermediate cell or the second cell, a plurality of members in the trunk axis direction that allows the lower end portion of the upper body plate to be displaced within a predetermined range Forming slits for adjustment at a predetermined pitch in the circumferential direction;
A plurality of guide pieces that guide the lower end portion of the upper-stage body plate and externally fit to the head reinforcing member are attached to the inner surface of the upper end portion of the head reinforcing member at a predetermined pitch in the circumferential direction.
A route gap is formed between the upper end portion of the lower-stage body plate and the lower end portion of the upper-stage body plate so that the head reinforcing member faces as a backing plate and is welded from the outer peripheral side. .

The connection structure of the steel plate cell / steel plate arc according to claim 4 is:
A plurality of cylindrical steel plate cells that are driven and penetrated into the ground along the trunk axis direction and are connected to each other by a steel plate arc,
The steel plate cell is a two-stage steel plate cell composed of a first cell penetrating into the ground at the installation site and a second cell connected to the upper end of the first cell, or a first cell penetrating into the ground at the installation site. And an intermediate cell connected to the upper end of the first cell, and a three-stage joint steel plate cell consisting of a third cell connected to the upper end of the intermediate cell, the connection between the first cell and the second cell, A connection structure of at least one of a connection portion between the first cell and the intermediate cell, and a connection portion between the intermediate cell and the second cell,
An inner peripheral rib that holds the shape of the lower-stage cell is attached to an upper inner peripheral surface of a cylindrical lower-stage body plate that forms the lower-stage cell that is the first cell or the intermediate cell, and the lower-stage cylinder A head reinforcing member whose upper end is retracted downward from the upper end of the lower side body plate is attached to the inner peripheral surface of the upper end portion of the plate,
Attach a backing plate whose upper end projects upward from the upper end of the lower stage body plate on the outer peripheral surface of the upper part of the lower stage body plate,
A plurality of cylinders formed at a predetermined pitch in the circumferential direction at a lower portion of a cylindrical upper body plate forming the upper cell that is the intermediate cell or the second cell, and the lower end of the body plate can be displaced within a predetermined range. The slit for adjustment is formed along the trunk axis direction,
At the inner surface of the head reinforcing member, a plurality of guide pieces that guide the lower end portion of the upper body plate of the upper cell and fit into the backing plate are attached at a predetermined pitch in the circumferential direction,
A route gap is formed between an upper end portion of the lower-stage body plate and a lower end portion of the upper-stage body plate so as to face the backing plate and weld from the inner peripheral side.

The connection structure of the steel plate cell / steel plate arc according to claim 5 is:
In the structure of Claim 3 or 4,
A receiving piece that receives the upper end portion of the guide piece on the inner peripheral surface of the upper stage body plate and forms the route gap between the upper end portion of the lower stage body plate and the lower end portion of the upper stage body plate. Is provided.

The connection structure of the steel plate cell / steel plate arc according to claim 6 is:
In the structure of Claim 3 or 4,
A receiving piece that receives the upper end portion of the guide piece on the inner peripheral surface of the upper stage body plate and forms the route gap between the upper end portion of the lower stage body plate and the lower end portion of the upper stage body plate. Is provided.

According to the installation method of the steel plate cell and the steel plate arc according to claim 1, the second cell is joined to the first cell penetrating the ground at the installation site, and the steel plate cell is assembled in a two-stage joint. Compared to a single steel plate cell that secures the height, the height of the steel plate cell can be reduced. As a result, even if there are height restrictions on aircraft flight lines, power transmission lines, bridges, etc. during transportation, production, placement, etc., they can be cleared easily. In addition, the second body plate of the second cell is fitted to the head reinforcing member attached to the upper end portion of the first body plate, and the second cell is connected to the upper end of the first cell. It can be implemented and can be assembled in a short time by circumferential welding.

According to the installation method of the steel plate cell / steel plate arc according to claim 2, since the intermediate cell is assembled on the first cell and the second cell is sequentially connected on the intermediate cell at the installation site, each cell is assembled. The height of the steel plate cell can be further reduced, and even when there is a height restriction during transportation, production, placement, etc., transportation, production, placement, etc. of a large and high steel plate cell is facilitated. be able to.

According to the connection structure of the steel plate cell / steel plate arc according to claim 3, the guide piece is attached to the head reinforcing member attached to the upper end portion of the lower side shell plate, and the lower end portion of the upper side shell plate is connected to the head portion. In addition to guiding to the outer periphery of the reinforcing member, an adjustment slit was formed in the lower part of the upper body plate so that the lower end of the upper body plate could be displaced. By smoothly fitting to the reinforcing member, the welding work of the upper cell can be easily and quickly performed from the outer peripheral side of the steel plate cell. In addition, the head reinforcing member can be used as a backing plate in the outer periphery welding, so that members necessary for welding can be reduced and the work period can be shortened.

According to the connection structure of the steel plate cell / steel plate arc according to claim 4, the lower end portion of the upper stage body plate can be displaced by the adjustment slit formed in the lower part of the upper stage side plate, and the upper end of the lower stage body plate Since the guide piece is attached to the head reinforcing member attached to the upper part, the lower end part of the upper stage side body plate can be guided to the inner peripheral part of the backing plate above the upper end of the lower stage side body plate. Can be smoothly fitted to the inner peripheral part of the backing plate. As a result, the welding work of the lower cell and the upper cell can be performed easily and in a short time from the inside of the steel plate cell using the backing plate, and the welding operation is affected by sea conditions such as waves. Less is.

According to the connection structure of the steel plate cell / steel plate arc according to claim 5, the receiving piece that receives the guide piece on the inner surface of the upper side body plate and forms a root gap between the lower side body plate and the upper side body plate. Therefore, the joining work by welding can be performed quickly and in a short time.

According to the connection structure of the steel plate cell / steel plate arc according to the sixth aspect, since the adjustment slit is formed by opening the lower portion of the block joint, the adjustment slit can be easily formed.

It is a partial perspective view which shows Example 1 of the two-stage joint steel plate cell and steel plate arc which concerns on this invention, and shows the steel plate cell installation state. It is a fragmentary perspective view which shows the installation state of a steel plate cell and a steel plate arc. It is a perspective view which shows the installation state of a 1st cell in the installation procedure of a steel plate cell. It is a perspective view which shows the suspended state of a 2nd cell in the installation procedure of a steel plate cell. It is a perspective view which shows the connection state of the 2nd cell to a 1st cell in the installation procedure of a steel plate cell. It is a perspective view which shows the joining state of a 1st cell and a 2nd cell in the installation procedure of a steel plate cell. It is the perspective view which expanded FIG. 3A. It is an inner surface side partial perspective view which shows the connection part of a 1st cell and a 2nd cell. It is a figure explaining the connection part of a 1st cell and a 2nd cell, (A) is a longitudinal cross-sectional view which shows the connection part of a 1st cell, (B) is the state before the connection of the 2nd cell to a 1st cell. (C) is a longitudinal cross-sectional view which shows the connection state of the 2nd cell to a 1st cell, (D) It is a perspective view which shows the joining state of a 1st cell and a 2nd cell. It is a figure explaining the connection part of a 1st cell and a 2nd cell, (A) is a rear view which shows the slit for adjustment, (B) is a side view which shows the connection part of a longitudinal rib. An arc joint is shown, (A) is a top view, (B) is a rear view of a connection part. It is a top view which shows a steel plate arc. It is a perspective view which shows the installation procedure of a 2 step | paragraph steel plate arc, (A) shows the attachment state of a 1st arc, (B) shows the suspended state of a 2nd arc, (C) is the connection of a 2nd arc. Indicates the state. It is a figure explaining the connection part of a steel plate arc, (A) is a longitudinal cross-sectional view which shows the connection part of a 1st arc, (B) is a longitudinal cross-sectional view which shows the connection state of the 1st arc to a 2nd arc, (C ) Is a longitudinal sectional view showing a joining state of the first arc and the second arc, and (D) is a side view showing a connecting portion of the longitudinal rib. It is an inner surface side partial perspective view which shows the connection part of a 1st arc and a 2nd arc. Example 2 of the other connection part structure of a 1st cell and 1st arc and a 2nd cell and 2nd arc is shown, (A) is a longitudinal cross-sectional view which shows the connection part of 1st cell and 1st arc, (B ) Is a connection state of the first cell / first arc of the second cell / arc, and (C) is a longitudinal sectional view showing a joining state of the first cell / first arc and the second cell / second arc. Example 3 which shows the connection structure of the three-stage joint steel plate cell which concerns on this invention is shown, and it is a perspective view of a three-stage joint steel plate cell and a steel plate arc. It is an inner surface side partial perspective view which shows the connection part of a three-stage joint steel plate cell. It is an inner surface side partial perspective view which shows the connection part of a 3 step joint steel plate arc.

Hereinafter, the outline of the embodiment of the present invention will be described.

The installation method of the steel plate cell / steel plate arc shown in FIGS. 1 and 2 is a penetration type installation method in which the steel plate cell is directly driven into the ground 15 of the seabed for installation. A plurality of cylindrical steel plate cells having an outer diameter of 15 to 50 m and a height of, for example, 20 to 40 m, and an arc-shaped steel plate arc connecting the steel plate cells are directly driven into the ground 15 on the seabed. Then, the steel plate cell and the steel plate arc are filled with the interstitial material 16 such as earth and sand to form harbor structures such as seawalls and breakwaters and marine structures. In the steel plate cell and steel plate arc described here, the joints are formed in a watertight structure by welding or the like. In this respect, it is different from a steel plate cell / steel arc for a river which is bolted and does not secure watertightness.

The steel plate cell / steel arc described in Example 1 is a two-stage joint steel plate cell 10 that is divided into an upper first cell (lower cell) 21 and a lower second cell (upper cell) 31 vertically. And a two-stage spliced steel sheet arc 11 that is divided into an upper part of the first arc 61 and a lower part of the second arc 71 in the vertical direction.

The three-stage joint steel plate cell / steel arc described in Example 3 includes an upper first cell (lower cell) 21, an interrupted intermediate cell (upper cell, lower cell) 41, and an upper second cell ( (Upper stage side cell) 31 is provided with a three-stage joint steel plate cell 12 divided into three parts, upper, middle and lower, and a three-stage joint steel sheet arc 13 composed of a first arc 61, an intermediate arc 81 and a second arc 71. is there.

In addition, the connection part of the two-stage joint steel plate cell 10 and the two-stage joint steel sheet arc 11 and the connection part in the upper part and the lower part of the three-stage joint steel sheet cell 12 and the three-stage joint steel sheet arc 13 are formed in the same structure.
[Example 1]
The two-stage joint steel plate cell 10 and the two-stage joint steel sheet arc 11 will be described with reference to FIGS.

The first cell 21 includes a body plate block 22 that is divided into a plurality (six parts in the figure) along the trunk axis O direction at predetermined intervals in the circumferential direction. These are joined together via a block joint 23 and formed into a cylindrical shape. In the block joint 23, L-shaped beam members 23a are respectively attached to the inner surfaces of the edge portions along the trunk axis O direction of the first trunk plate (lower side trunk plate) 24 forming the trunk plate block 22. Then, after these L-shaped beam members 23a are connected to each other by a plurality of bolts 23b, the edges of the first body plates 24 of these body plate blocks 22 are welded together. A plurality of vertical ribs 28 along the trunk axis O direction are attached to the inner circumferential surface of the first trunk plate 24 at a predetermined pitch in the circumferential direction. Further, circumferential ribs (not shown) along the circumferential direction are attached at predetermined positions in the vertical direction.

The second cell 31 includes a body plate block 32 divided into a plurality (six parts in the figure) along the trunk axis O direction at predetermined intervals in the circumferential direction, and the block joint 33 is formed at each divided portion. Are joined to each other and formed into a cylindrical shape. The block joint 33 is a second trunk plate (upper side trunk plate) 34 that forms the trunk plate block 32, and an L-shaped beam member 33a is attached to the inner surface of the edge portion along the trunk axis O direction. And after connecting these L-shaped beam material 33a with the some volt | bolt 33b, the edge parts of the 2nd trunk | drum 34 of the both trunk | drum board block 32 are weld-joined. A plurality of vertical ribs 38 along the trunk axis O direction are attached to the inner circumferential surface of the second trunk plate 34 at a predetermined pitch in the circumferential direction. And the circumferential direction rib (not shown) in alignment with the circumferential direction is attached to the predetermined position in the up-down direction.

(Junction structure of first cell and second cell)
A junction structure between the first cell 21 and the second cell 31 will be described with reference to FIGS.

On the inner peripheral surface of the first body plate 24 of the first cell 21, apart from the circumferential ribs, intermediate inner peripheral ribs 25 M for holding the cylindrical shape of the first cell 21 are provided in the intermediate portion over the entire circumferential direction. The upper inner peripheral rib 25U is attached to the vicinity of the upper part over the entire circumference. Further, a head reinforcing plate (head reinforcing member) 26 for fitting the second body plate 34 of the second cell 31 on the inner peripheral surface of the first body plate 24 and on the upper part of the upper circumferential cell 25U is arranged around the entire circumference. Attached over. The upper end portion of the head reinforcing plate 26 protrudes upward from the upper end of the first body plate 24 by a protruding length: T. Further, a guide piece 27 for guiding the lower end of the second body plate 34 of the second cell 31 to the outer periphery of the head reinforcing plate 26 is attached to the inner surface of the upper end of the head reinforcing plate 26 at a predetermined pitch in the circumferential direction. It has been. These guide pieces 27 are formed in a substantially rectangular parallelepiped shape having an inclined guide surface 27 a, and are attached so as to protrude upward by a predetermined distance from the upper end portion of the head reinforcing plate 26. The inclined guide surface 27 a is formed such that the outer peripheral side surface is inclined from the upper inner periphery to the lower outer periphery in order to guide the lower end portion of the second body plate 34. A step portion 27b is formed below the inclined guide surface 27a of the guide piece 27 so that the upper end portion of the head reinforcing plate 26 is engaged. The step portion 27b effectively supports the load from above. is doing.

On the other hand, a plurality of receiving pieces 35 respectively corresponding to the guide pieces 27 are attached on the inner surface of the second body plate 34 of the second cell 31 above the lower end by a predetermined distance. When the first cell 21 and the second cell 31 are connected, the receiving piece 35 is set to abut on the upper end receiving surface 27 c of the guide piece 27. These receiving pieces 35 are constituted by a receiving plate 35a whose upper end receiving surface 27c abuts on the lower surface, and one or a plurality of reinforcing members 35b attached to the upper portion of the receiving plate 35a to support a load. The upper end receiving surface 27c of the guide piece 27 comes into contact with the lower surface of the receiving plate 35a in a state where the second upper plate 34 is fitted on the head reinforcing plate 26, and the upper end of the first upper plate 24 and the second upper plate. The upper and lower positions of the guide piece 27 and the receiving piece 35 are set so as to form a route gap R of the outer peripheral welded portion Wo shown in FIG. In FIG. 6, reference numeral 20 denotes a scaffolding bracket attached to the upper inner and outer surfaces of the upper inner peripheral rib 25 U.

Further, the second cell 31 is formed with an adjustment slit 36 which is opened by a predetermined length at least under each block joint 23 of the second body plate 34 in order to allow deformation at the time of connection. . These adjustment slits 36 are formed by removing the joint flange and the welded portion. Then, the lower end portion of the second body plate 34 guided by the guide piece 27 is deformed by the adjusting slits 36 so that the outer periphery of the head reinforcing plate 26 can be easily fitted. The adjustment slit 36 can also be formed in a region other than the block joint 23 in the direction of the trunk axis O.

Each vertical rib 28 of the first cell 21 is suspended and fixed to the inner surfaces of the first body plate 24 and the head reinforcing plate 26, and the upper end of each vertical rib 28 is slightly more than the upper end of the head reinforcing plate 26. It is in a low position. Each vertical rib 38 of the second cell 31 is suspended from the inner surface of the second body plate 34, and the upper end portion of each vertical rib 38 is at a position higher than the lower end of the second body plate 34 by a predetermined distance. . 7B, when the first cell 21 and the second cell 31 are joined, a gap d is generated between the vertical rib 28 of the first cell 21 and the vertical rib 38 of the second cell 31. Designed to be For this reason, the

vertical ribs

28 and 38 of the 1st,

2nd cells

21 and 31 do not contact. When the first and

second cells

21 and 31 are connected, the connecting plate 28a is disposed across the

vertical ribs

28 and 38, and the connecting plate 28a and the

vertical ribs

28 and 38 are connected and fixed by a plurality of bolts 28b. Thereby, both these

vertical ribs

28 and 38 can be used as an erection piece which temporarily fixes until the 1st,

2nd cells

21 and 31 are welded. Thereby, compared with attaching and temporarily fixing an erection piece separately, attachment and removal of an erection piece become unnecessary and it can reduce a number of parts.

As shown in FIG. 8, arc joints 29 are respectively attached to the joints with the steel plate arc 11 on the outer peripheral surfaces of the first cell 21 and the second cell 31. The arc joint 29 uses an inverted L-shaped joint member composed of a standing portion 29a and an overhang portion 29b. The pair of left and right joint members are attached in parallel to each other so as to form the insertion port 29c with the protruding portion 29b facing each other. The insertion holes 29c of the arc joint 29 are fitted with T-shaped joints 69 and 79 having a T-shape in a plan view formed on the side edge of the steel plate arc 50, and further, concrete or mortar is placed in the space of the arc joint 29. The filler is embedded and formed.

(Steel plate arc)
Next, a two-stage steel sheet arc 11 connecting these two-stage steel sheet cells 10 will be described with reference to FIGS. In addition, the same name is attached | subjected and demonstrated to the same structural member as the two-stage joint steel plate cell 10 demonstrated previously. The two-stage spliced steel plate arc 11 includes a pair of front and rear lower arcs 61 driven into the ground 15 of the seabed and a pair of front and rear upper arcs 71 connected to the upper end of the first arc 61. .

In the first arc 61, a body plate block 62 divided into a plurality of parts (two parts in the figure) at a predetermined interval in the circumferential direction is joined via a block joint 63 at a divided portion along the body axis O direction. It is formed in an arc shape in plan view. In the block joint 63, L-shaped beam members 63a are respectively attached to inner surfaces of both edge portions along the trunk axis O direction on the first arc barrel plate 64 of the trunk plate block 62, and a plurality of these L-shaped beam members 63a are provided. After being connected to each other by a bolt (not shown), both edges of the first arc drum plate 64 of the two drum plate blocks 62 are welded together. Although not shown, a plurality of vertical ribs along the trunk axis O direction are attached to the inner circumferential surface of the trunk plate block 62 at a predetermined pitch in the circumferential direction. Further, circumferential ribs along the circumferential direction are attached at a predetermined pitch in the vertical direction.

The second arc 71 is formed by joining a body plate block 72 divided into a plurality (two in the figure) at a predetermined interval in the circumferential direction through a block joint 73 at a divided portion along the trunk axis O direction. It has a cylindrical shape. The block joint 73 is attached to the second arc drum plate 74 of the drum plate block 72 with joint flanges 73a on the inner surfaces of both edges along the trunk axis O direction, and the joint flanges 73a are attached to a plurality of bolts (not shown). ), The both edges of the second arc drum plate 74 of the two drum plate blocks 72 are welded together. Further, a plurality of vertical ribs 78 along the trunk axis O direction are attached to the inner circumferential surface of the second arc barrel plate 74 at a predetermined pitch in the circumferential direction, and circumferential ribs (not shown) along the circumferential direction are provided. It is attached at a predetermined position in the vertical direction.

(First arc joint)
A joint structure between the first arc 61 and the second arc 71 will be described with reference to FIGS. 11 and 12.

In order to maintain the arc shape of the first arc 61 on the inner peripheral surface of the first arc 61 on the inner peripheral surface of the first arc body plate 64 in the vicinity of the intermediate portion and the upper portion separately from the circumferential rib, the intermediate inner peripheral rib 65M and An upper inner circumferential rib 65U is attached over the entire circumference. A head reinforcing plate (head reinforcing member) 66 is attached to the inner peripheral surface of the first arc barrel plate 64 at the upper part of the upper inner peripheral rib 65U. The head reinforcing plate 66 is configured such that the second arc body plate 74 of the second arc 71 is fitted on the outer peripheral side. The upper end portion of the head reinforcing plate 66 is retracted downward from the upper end of the first arc barrel plate 64 by a retreat length: U. Further, a pair of inner and

outer guide pieces

67A and 67B are attached to the upper end portions of the head reinforcing plate 66 and the first arc barrel plate 64 at a predetermined pitch in the circumferential direction. These guide pieces 67 A and 67 B can guide the lower end portion of the second arc body plate 74 of the second arc 71 to the outer peripheral portion of the head reinforcing plate 66. These guide pieces 67 A and 67 B are formed in a substantially rectangular parallelepiped shape having an inclined side on the upper facing surface, and are attached so as to protrude upward by a predetermined distance from the upper end portion of the head reinforcing plate 66. The

guide pieces

67A, 67B are each formed with an inclined guide surface 67a that is closer to each other on the upper facing surface facing each other, and the lower end portion of the inclined guide surface 67a is the upper end of the head reinforcing plate 66 in the height direction. Corresponds to the position.

(Second arc joint)
On the other hand, on the inner surface of the second arc body plate 74 of the second arc 71, the receiving piece 75 is attached facing the inner guide piece 67A, respectively, at a predetermined distance above the lower end. These receiving pieces 76 include a receiving plate 75a and a plurality of reinforcing members 75b that are attached to the upper portion of the receiving plate 75a and support a load. When the receiving plate 75a is brought into contact with the upper end receiving surface 67c of the guide piece 67 while the second arc 71 is externally fitted to the first arc 61, the upper end of the first arc barrel plate 64 and the second arc. The upper and lower positions of the guide piece 67A and the receiving piece 76 are set so that a route gap R for the outer peripheral welded portion Wo shown in FIG. 11C is formed between the lower end of the trunk plate 74.

Further, as shown in FIG. 12, an adjustment slit 76 having a predetermined length is formed in the second arc body plate 74 of the second arc 71 at least from the attachment portion of the block joint 73 to the lower portion. These adjusting slits 76 allow the deformation of the second arc drum plate 74 by removing the joint flange and the welded portion, and the lower end portion of the second arc drum plate 74 guided by the

guide pieces

67A and 67B is the head. It can be easily fitted on the outer peripheral portion of the portion reinforcing plate 66. Note that the adjustment slit 76 can be formed along the trunk axis O in a portion other than the block joint 23.

Furthermore, as shown in FIG. 11D, vertical ribs 68 project from the inner circumferential surface of the first arc 61 along the trunk axis O direction. These vertical ribs 68 are fixed to the inner surfaces of the first arc body plate 64 and the head reinforcing plate 66 so that their upper ends are slightly lower than the upper ends of the head reinforcing plate 66. Further, vertical ribs 78 project from the inner peripheral surface of the second arc 71 along the trunk axis O direction. Each vertical rib 78 of the second arc 71 has a lower end portion at a position higher than the lower end of the second arc steel plate 74 by a predetermined distance. The gap d is set between the vertical rib 68 of the first arc 61 and the vertical rib 78 of the second arc 71 when the first arc 61 and the second arc 71 are joined. For this reason, the

vertical ribs

68 and 78 of the first and

second arcs

61 and 71 do not contact each other. When the first and

second arcs

61 and 71 are connected, a connecting plate 68a is attached between the

longitudinal ribs

68 and 78, and is connected and fixed by a plurality of bolts 68b. Thereby, it can be used as an erection piece that performs temporary fixing until welding, and it is not necessary to attach and remove the erection piece, and the number of parts can be reduced as compared with the case where the erection piece is separately attached.

T-shaped joints 69 and 79 are provided on both side edges of the first arc 61 and the second arc 71 and are fitted to and connected to the arc joint 29.

(Installation method of steel plate cell and steel plate arc)
The installation method of the said steel plate cell and steel plate arc is demonstrated.

The installation method of the two-stage steel plate cell / steel plate arc is that the first cell 21 is driven into the ground 15 of the seabed until the upper end of the first shell plate 24 of the first cell 21 reaches a predetermined height on the water surface. Intrude. And, the second body plate 34 of the second cell 31 is externally fitted to the head reinforcing plate 26 attached to the inner peripheral surface of the first body plate 24, and the second cell is connected to the first cell 21, The upper end portion of the first trunk plate 24 and the lower end portion of the second trunk plate 34 are joined by circumferential welding.

Next, T-shaped joints 69 provided at both side edges of the first arc 61 are respectively fitted to the arc joints 29 of the second cells 31 so as to sink while connecting the first arc 61 and the steel plate cell 10. . Next, the first arc 61 is driven into the bottom 15 of the seabed and penetrates until the upper end of the first arc shell plate 64 reaches a predetermined height above the water surface. Further, T-shaped joints 79 provided on both side edges of the second arc 71 are fitted to the arc joints 29 of the second cells 31 to connect the second arc shell plate 74 and the steel plate cell 10 to each other. 2 The arc barrel plate 74 is lowered. Then, the lower end portion is externally fitted to the head reinforcing plate 66 attached to the inner peripheral surface of the first arc drum plate 64, and the second arc drum plate 74 is connected to the first arc drum plate 64. Further, the upper end portion of the first arc drum plate 64 and the lower end portion of the second arc drum plate 74 are joined by circumferential welding.

The details will be described below.

(1) The first cell 21 transported to the installation sea area by a crane ship is sunk at a predetermined position by a crane through a hanging tool, and the first cell 21 is placed on the seabed by a vibro hammer 17 attached to the hanging tool. Driving into the ground 15, as shown in FIG. 3A, the upper end of the first body plate 24 is stopped at a position where it is, for example, about 1 to 2 m from the water surface.

(2) As shown in FIG. 3B and FIG. 4, the second cell 31 is lifted by a crane of a crane ship via a hanging tool, and is slowly lowered from above the first cell 21. Next, the receiving piece 35 is positioned above the guide piece 27. And the lower end part of the 1st trunk plate 34 is located in the outer side of the guide piece 27, and as shown to FIG. 3C, the lower end part of the 2nd trunk plate 34 is guided using the inclination guide surface 27a, and a head reinforcement board is shown. 26 is fitted into the outer periphery. Then, as illustrated in FIG. 6C, a route gap R is formed between the lower end portion of the first trunk plate 24 and the lower end portion of the second trunk plate 34. At this time, since the adjustment slit 36 is formed in the lower part of the second body plate 34, the lower part of the second body plate 34 can be deformed to easily adjust the alignment. Therefore, even if there is a deformation due to the manufacture of the first and

second cells

21 and 31 or a deformation due to the driving of the first cell 21, the second body plate 34 can be easily and reinforced in a short time. It can be fitted on the plate 26.

(3) As shown in FIG. 7 (B), a connecting plate 28a is disposed at the connecting portion of the

longitudinal ribs

28, 38 of the first cell 21 and the second cell 31, and is coupled by a bolt 28b. The second cell 31 is connected. Thereby, the hanging tool with a crane can be detached from the second cell 31. The connecting portions of the

vertical ribs

28 and 38 are used as they are after the connection is completed.

Further, along a route gap R formed between the first body plate 24 and the second body plate 34, a traveling rail for a welding machine (not shown) is provided on the first body plate 24 and / or the second body plate 34. Install. Then, the welding machine is run along the running rail, and as shown in FIG. 6 (D), the head gap reinforcing plate 26 is used as a backing plate, the route gap R is welded from the outer periphery side, and the outer periphery welded portion Wo. Form. Further, as shown in FIG. 7A, a backing metal 36a that covers the gap including the adjustment slit 36 is attached to the joint portion of the block joints 23 and 33 of the first and

second cells

21 and 31, and the outer peripheral side. Weld from.

(4) As shown in FIG. 3D, the vibro hammer 17 drives the second and

first cells

31 and 21 into the ground 15 on the seabed to a predetermined depth.

(5) When a plurality of steel plate cells 10 are installed, then a steel plate arc 11 is installed. As shown in FIG. 10 (A), one of the first arcs 61 is lifted by a crane of a crane ship via a hanging tool and disposed between adjacent steel cells 10. Then, the T-shaped joint 69 of the first arc 61 is fitted into the arc joint 29 of the second cell 31 from above, and the first arc 61 is submerged from above to the ground 15 on the seabed. Furthermore, the first arc 61 is driven into the ground 15 on the seabed by the vibro hammer 17 attached to the hanging tool, and is stopped at a position where the upper end of the first arc barrel plate 64 is, for example, about 1 to 2 m from the water surface.

(6) The second arc 71 is lifted by the crane of the crane ship through the suspension tool, and is slowly lowered above the first arc 61. The T-shaped joint 79 of the second arc 71 is fitted to the arc joint 29 of the second arc 71 from above and lowered to adjust the posture of the second arc 71 so that the receiving piece 75 faces the guide piece 67A. Let Then, the lower end portion of the first arc barrel plate 64 is guided by the inclined guide surfaces 67a and 77a of the

guide pieces

67A and 67B, and is fitted into the outer peripheral portion of the head reinforcing plate 66. At this time, since the adjustment slit 76 is formed in the lower part of the second arc drum plate 74, the lower end portion of the second arc drum plate 74 can be easily deformed to perform alignment adjustment. Therefore, even if the first and

second arcs

61 and 74 are deformed or driven in during the manufacturing process, the second arc shell plate 74 is easily fitted on the body reinforcing plate 66 of the first arc 61 in a short time. Can be made.

(7) The connecting plates 68a are arranged on the

vertical ribs

68 and 78 of the first arc 61 and the second arc 71 and coupled by bolts. Further, although not shown, a welder is attached to the first arc drum plate 64 and / or the second arc drum plate 74 along a route gap R formed between the first arc drum plate 64 and the second arc drum plate 74. Attach the running rail. And a welding machine is made to drive | work along a running rail, and the route gap R is outer periphery welded from an outer peripheral side. Further, at the joint portion of the block joints 63 and 73 of the first and

second arcs

61 and 71, the backing metal 36a is attached to the gap including the adjustment slit 76 and welded from the outer peripheral side to form the outer peripheral welded portion Wo. .

(8) The first and

second arcs

61 and 71 are driven into the ground 15 on the seabed to a predetermined depth by the vibro hammer 17.

According to the first embodiment, the tubular second cell 31 is joined to the tubular first cell 21 with the lower part penetrating into the seabed ground 15 using the vibro hammer 17 at the installation site. Since the cell 10 is assembled, the heights of the first cell 21 and the second cell 31 can be reduced as compared with a single steel plate cell that secures a necessary height. Thereby, the height restrictions of the aircraft flight line, the power transmission line, and the bridge can be easily cleared at the time of transportation, production, placement, and the like. Further, the second body plate 34 of the second cell 31 is fitted to the outer periphery of the head reinforcing plate 26 attached to the upper end portion of the first body plate 24, and the second cell is connected to the upper end of the first cell. Therefore, it can be easily assembled at the installation site such as the Gulf, and can be assembled in a short time by circumferential welding.

A guide piece 27 is attached to the head reinforcing plate 26 attached to the upper end portion of the first body plate 24 to guide the lower end portion of the second body plate 34 to the outer peripheral portion of the head reinforcing plate 26, and Since a plurality of adjustment slits 36 are formed in the lower portion of the plate 34 so that the lower end portion of the second body plate 34 can be displaced, the lower end portion of the second body plate 34 can be easily deformed to make the head reinforcing plate. The second cell 31 can be connected easily and in a short time. Further, the head reinforcing plate 26 can be used as a backing plate in the outer periphery welding, so that members necessary for welding can be reduced and the work period can be shortened.

Further, the receiving piece 35 provided on the inner surface of the second body plate 34 is received by the guide piece 27, and a route gap R can be formed between the first body plate 24 and the second body plate 34. The joining work by welding can be carried out quickly and in a short time.

Furthermore, since the adjustment slit 36 is formed below the block joint 33, the adjustment slit 36 can be formed easily and in a short time.

Moreover, the same effect as that of the steel cell 10 can be obtained by similarly configuring the connecting portion of the two-stage spliced steel sheet arc 11.

[Example 2]
In the first embodiment, the root gap R between the first trunk plate 24 and the second trunk plate 34 is joined by outer periphery welding. However, since the work is performed at sea, there is a possibility that it is affected by sea conditions such as waves. In the second embodiment, the root gap R between the first body plate 24 and the second body plate 34 is joined by inner circumference welding, which will be described with reference to FIG. Note that the same members as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

That is, in the two-stage joint steel plate cell 10 composed of the first cell (lower cell) 21 and the second cell 31 (upper cell), on the upper inner peripheral surface of the first body plate 24 of the first cell 21, The upper inner peripheral rib circumference 25U that holds the shape of the first cell 21 is attached, and the upper end of the upper end of the first body plate 24 is retracted from the upper end of the first body plate 24 by a predetermined length L. A head reinforcing plate 26 is attached. Further, a backing plate 40 protruding upward from the upper end of the first trunk plate 24 is attached to the outer peripheral surface of the upper end portion of the first trunk plate 26 over the entire circumference.

Further, the adjustment slit 36 formed in the lower part of the second body plate 34 of the second cell 21 and the guide piece 27 attached to the inner surface of the head reinforcing plate 26 are the same as in the first embodiment.

In the above-described configuration, the second cell 31 is opposed to the receiving piece 35 above the guide piece 27 by the crane of the crane ship so that the receiving piece 35 is positioned, and is slowly lowered from above the first cell 21. And the lower end part of the 1st trunk plate 24 is guided using the inclination guide surface 27a of the guide piece 27, it fits in the inner peripheral part of the backing plate 40 by the upper end of the 1st trunk plate 24, and the 2nd trunk plate The lower end portion of the second body plate 34 is deformed and the position is adjusted by an adjustment slit 36 below the portion 34.

Further, the first cell 21 and the second cell 31 are connected to each other by a bolt 28b through a joint 28a to the connecting portion of the

vertical ribs

28 and 38 of the first cell 21 and the second cell 31.

Further, along the route gap R formed between the first body plate 24 and the second body plate 34, the inner peripheral surface of the second body plate 34 and / or the inner peripheral surface of the head reinforcing plate 26 is used for the welding machine. A traveling rail (not shown) is attached, a welding machine is traveled along the traveling rail, and welding is performed from the inner peripheral side using the backing plate 40 to form the inner peripheral welded portion Wi.

According to the second embodiment, the guide piece 27 is attached to the head reinforcing plate 26 attached to the upper end portion of the first trunk plate 24, and the lower end portion of the second trunk plate 34 is connected to the upper end portion of the first trunk plate 24. Thus, the displacement of the lower end portion of the second body plate 34 can be displaced by the adjustment slit 36 formed in the lower portion of the second body plate 31. The lower end portion of the trunk plate 34 can be smoothly fitted on the inner peripheral portion of the backing plate 40 above the upper end portion of the first trunk plate 24, and the connection work of the second cell 31 can be performed in the first and second cases. It can be carried out easily and in a short time from the inner peripheral side of the

cells

21 and 31, and the welding operation is less affected by sea conditions such as waves.

In addition, although it welded to the steel plate cell 10 from the inner peripheral side and formed the inner peripheral welding part Wi, the connection part of the 1st arc 61 of the steel plate arc 11 and the 2nd arc 71 can also be comprised similarly.

[Example 3]
A third embodiment of a three-stage steel plate cell / steel plate arc will be described with reference to FIGS.

The three-stage spliced steel plate cell / steel plate arc is divided into three parts by a first cell (lower cell) 21, an intermediate cell (upper cell, lower cell) 1 and a second cell (upper cell) 31. A stepped steel plate cell 12 and a three stepped steel plate arc 13 that is vertically divided by a first arc 61, an intermediate arc 81, and a second arc 71 are provided.

In these three-stage steel plate cells and steel plate arcs, the intermediate cell 41 has a plurality of body plate blocks 42 connected in the circumferential direction via block joints 43 in the direction of the body axis O, and is cylindrical by the intermediate body plate 44. Is formed. Further, the intermediate arc 81 is formed by connecting a plurality of body plate blocks 82 in the circumferential direction to the intermediate arc body plate 84 via a block joint 83 in the direction of the body axis O, and forming these arcs in an arc shape. Yes. The connecting portion between the first cell / steel plate arcs 21 and 61 and the intermediate cell arcs 61 and 81 has the same connecting portion structure as that of the first embodiment, and the intermediate cell arcs 61 and 81 and the second cell arc. The

connection portions

31 and 71 have the same connection portion structure as that of the first embodiment. Therefore, the lower end side of the intermediate cell arcs 41 and 81 is configured the same as the upper end side of the second cell 31, and the upper end side of the intermediate cell arcs 41 and 81 is configured the same as the upper end side of the first cell 21. Is done. For this reason, the same components as those of the first embodiment are denoted by the same reference numerals and the description thereof is omitted.

The installation method at the installation site in the third embodiment is to connect the first cell arcs 21 and 61 and the intermediate cell arcs 41 and 81 by repeating the two-stage joint connection twice to connect to the three-stage joint. Then, the same connection work of the intermediate cell arcs 41 and 81 and the second cell arcs 31 and 71 is repeated twice.

According to the above embodiment, the first cell arcs 21 and 61 are assembled on the installation site by connecting the intermediate cell arcs 41 and 81 and the intermediate cell 41 with the

second cells

31 and 81, respectively. The height of each of the intermediate,

second cells

21, 41, 31 and the first, intermediate, second arcs 61, 81, 71 can be lowered, and the transportation, production, placement, etc. Even if the height is limited, transportation, production, and placement of a large and high steel plate cell can be easily performed.

Also in the connection structure, the same effects as those of the first embodiment can be obtained.

In addition, the connection part on the 1st cell 21 and the intermediate cell 41, and the connection part of the intermediate cell 41 and the 2nd cell 31 can be comprised by the same structure as Example 2. FIG.

Further, although the

steel plate cells

10 and 12 are formed in a circular cross section, an elliptical cross section, an oval cross section, a bowl-shaped cross section, or the like may be used. Furthermore, although the steel plate arcs 11 and 13 are formed in an arcuate cross section, other curved shapes or flat plate shapes may be used. Moreover, the form which is not filled with a filling material may be sufficient.

Furthermore, in each of the above embodiments, the steel plate cell / steel plate arc is directly placed on the “sea floor ground”, but it is not limited to the sea floor, but may be land such as a revetment or quay.

Claims

After a plurality of steel plate cells formed in a cylindrical shape are driven into the ground at predetermined intervals, a steel plate arc is driven into the ground between the steel plate cells, the steel plate cells are connected to each other by the steel plate arc, and at least An installation method of a steel plate cell / steel arc filling the steel plate cell with an interstitial material,
The steel plate cell is composed of a first cell and a second cell,
A cylindrical first trunk plate for forming the first cell is driven into the ground along the trunk axis direction,
A cylindrical second member that suspends the second cell from above the first cell and forms the second cell on a connection member attached to the inner peripheral surface or the outer peripheral surface at the upper end of the first body plate. Fit the body plate, connect the second cell on the first cell,
An installation method for a steel plate cell / steel plate arc, wherein the upper end portion of the first body plate and the lower end portion of the second body plate are joined by circumferential welding.
After a plurality of steel plate cells formed in a cylindrical shape are driven into the ground at predetermined intervals, a steel plate arc is driven into the ground between the steel plate cells, the steel plate cells are connected to each other by the steel plate arc, and at least An installation method of a steel plate cell / steel arc filling the steel plate cell with an interstitial material,
The steel plate cell is composed of a first cell, an intermediate cell, and a second cell,
The cylindrical first body plate forming the first cell is driven into the ground along the trunk axis direction,
A cylindrical intermediate body plate that forms the intermediate cell is attached to a connection member attached to an inner peripheral surface or an outer peripheral surface at an upper end portion of the first body plate, hanging above the first cell or the intermediate cell. Fitting, connecting the intermediate cell on the first cell,
The upper end portion of the first body plate and the lower end portion of the intermediate body plate are joined by circumferential welding,
An intermediate cell is formed by fitting a lower end portion of a cylindrical second body plate forming the second cell to an intermediate connection member attached to an inner peripheral surface or an outer peripheral surface of the intermediate body plate at an upper end portion of the intermediate cell. Connect the second cell to the top of
An installation method for a steel plate cell / steel plate arc, wherein the upper end portion of the intermediate shell plate and the lower end portion of the second shell plate are joined by circumferential welding.
A plurality of cylindrical steel plate cells that are driven and penetrated into the ground along the trunk axis direction and are connected to each other by a steel plate arc,
The steel plate cell is a two-stage steel plate cell composed of a first cell penetrating into the ground at the installation site and a second cell connected to the upper end of the first cell, or the first cell penetrating into the ground at the installation site. 1 cell and an intermediate cell connected to the upper end of the first cell, and a three-stage steel plate cell consisting of the second cell connected to the upper end of the intermediate cell, the first cell and the second cell A connection portion structure of the first cell and the intermediate cell, and the connection portion structure of the intermediate cell and the second cell,
An inner peripheral rib for holding the shape of the lower-stage cell is attached to an upper inner peripheral surface of a cylindrical lower-stage body plate that forms the lower-stage cell that is the first cell or the intermediate cell, and the lower-stage cylinder A head reinforcing member is attached to the inner peripheral surface of the upper end of the plate, with the upper end protruding upward from the upper end of the lower body plate,
In the lower part of the cylindrical upper body plate forming the upper cell that is the intermediate cell or the second cell, a plurality of members in the trunk axis direction that allows the lower end portion of the upper body plate to be displaced within a predetermined range Forming slits for adjustment at a predetermined pitch in the circumferential direction;
A plurality of guide pieces that guide the lower end portion of the upper-stage body plate and externally fit to the head reinforcing member are attached to the inner surface of the upper end portion of the head reinforcing member at a predetermined pitch in the circumferential direction.
A route gap is formed between the upper end portion of the lower-stage body plate and the lower end portion of the upper-stage body plate so that the head reinforcing member faces as a backing plate and is welded from the outer peripheral side. Connection structure of steel plate cell.
A plurality of cylindrical steel plate cells that are driven and penetrated into the ground along the trunk axis direction and are connected to each other by a steel plate arc,
The steel plate cell is a two-stage steel plate cell composed of a first cell penetrating into the ground at the installation site and a second cell connected to the upper end of the first cell, or a first cell penetrating into the ground at the installation site. And an intermediate cell connected to the upper end of the first cell, and a three-stage joint steel plate cell consisting of a third cell connected to the upper end of the intermediate cell, the connection between the first cell and the second cell, A connection structure of at least one of a connection portion between the first cell and the intermediate cell, and a connection portion between the intermediate cell and the second cell,
An inner peripheral rib that holds the shape of the lower-stage cell is attached to an upper inner peripheral surface of a cylindrical lower-stage body plate that forms the lower-stage cell that is the first cell or the intermediate cell, and the lower-stage cylinder A head reinforcing member whose upper end is retracted downward from the upper end of the lower side body plate is attached to the inner peripheral surface of the upper end portion of the plate,
Attach a backing plate whose upper end projects upward from the upper end of the lower stage body plate on the outer peripheral surface of the upper part of the lower stage body plate,
A plurality of cylinders formed at a predetermined pitch in the circumferential direction at a lower portion of a cylindrical upper body plate forming the upper cell that is the intermediate cell or the second cell, and the lower end of the body plate can be displaced within a predetermined range. The slit for adjustment is formed along the trunk axis direction,
At the inner surface of the head reinforcing member, a plurality of guide pieces that guide the lower end portion of the upper body plate of the upper cell and fit into the backing plate are attached at a predetermined pitch in the circumferential direction,
A root gap is formed between the upper end of the lower shell plate and the lower end of the upper shell plate so as to face the backing plate and weld from the inner peripheral side. Connection structure.
A receiving piece that receives the upper end portion of the guide piece on the inner peripheral surface of the upper stage body plate and forms the route gap between the upper end portion of the lower stage body plate and the lower end portion of the upper stage body plate. The connection structure of the steel plate cell according to claim 3 or 4, wherein the structure is provided.
A receiving piece that receives the upper end portion of the guide piece on the inner peripheral surface of the upper stage body plate and forms the route gap between the upper end portion of the lower stage body plate and the lower end portion of the upper stage body plate. The connection structure of the steel plate cell according to claim 3 or 4, characterized by comprising: