JP2012180678A - Replacement method of water elevated structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly perform replacement work of a water elevated structure.SOLUTION: When replacing a water elevated structure 16 including piles 12 placed to water bottom ground G and a floor slab 14 supported by them, the existing floor slab 14 is bored to form an opening 18 in the extending direction of the existing water elevated structure 16, a new pile 20 is placed so as to be projected from the opening 18 onto the existing floor slab 14 or be the same height as the existing floor slab 14, and the new pile 20 is utilized as an installation location of a bridge type crane 24. While moving the bridge type crane 24 so as to transfer the new piles 20, new piles 20 are carried in and placed further and the existing floor slab 14 and the existing piles 12 are dismantled and carried away by using the bridge type crane 24. Thereafter, while moving the bridge type crane 24 so as to transfer the new piles 20, a new floor slab is installed onto the new piles 20 and the water elevated structure is reconstructed.

Description

  The present invention relates to a method for replacing a water elevated structure.

  Conventionally, when constructing an elevated structure including a pile placed on the ground and a floor slab supported by the pile, a pile driving device on the pile is used as a method of placing a plurality of piles in the extending direction. A method is proposed in which the pile driving device is transferred to a newly placed pile as the pile driving progresses by the pile driving device (for example, Patent Documents 1 and 2).

In addition, as a method of constructing an elevated structure above the railway track installed on the ground, the pile is placed on the ground and the floor slab installed on the pile is separated from the floor slab in the horizontal direction. The slab installed by using a pile driving machine capable of setting a pile on the ground at a position, a first step of mounting a crane, and a pile driving machine mounted on the installed floor slab A second step of driving a pile to function as a pillar a portion protruding upward from the ground at a predetermined position on the ground that is spaced apart from the extension direction of the elevated structure, and using the crane, A third step of laying a new floor slab on the pile placed in the second step; and a fourth step of moving the pile driving machine and the crane to the floor slab constructed in the third step. The construction method of extending the elevated structure by repeating the second to fourth steps was invented Is (for example, Patent Document 3).

JP-A-60-156824 JP 61-162630 A JP 2008-115628 A

On the other hand, in recent years, there has been a demand for renewal of existing elevated structures in response to requests for aging countermeasures and strengthening of earthquake resistance. However, when it is difficult to newly build an elevated structure on a new route due to difficulty in securing the site, it is necessary to dismantle the existing elevated structure and reconstruct it at the same location. In particular, under the influence of existing adjacent structures, the work space in the work area is limited, and the elevated structure including the piles placed on the bottom floor and the floor slab supported by it is replaced. In the case, loading and movement of heavy machinery, materials, and the like are greatly limited, and the work is not easy.
This invention is made in view of the said subject, The place made into the objective is to perform the replacement work of a water elevated structure smoothly in the water work area which is restrict | limited to at least one part work space. It is to make it possible.

(Aspect of the Invention)
The following aspects of the present invention exemplify the configuration of the present invention, and will be described separately for easy understanding of various configurations of the present invention. Each section does not limit the technical scope of the present invention, and some of the components of each section are replaced, deleted, or further while referring to the best mode for carrying out the invention. Those to which the above components are added can also be included in the technical scope of the present invention.

(1) A method of exchanging an elevated structure including a pile placed on the bottom of the ground and a floor slab supported by the pile, and the existing floor slab along the direction in which the existing elevated structure extends. A bridge-type crane that is movable so as to be transferred onto the new pile is installed by repeating the operation of forming a new pile from the opening a plurality of times, and using the bridge-type crane. In addition, the process of removing the existing elevated structure by installing and placing new piles and placing, dismantling and removing the existing floor slabs and existing piles, and installing the new floor slabs on the new piles, A method of replacing the elevated structure, wherein the step of reconstructing the elevated structure is performed together with the movement of the bridge crane (claim 1).

The replacement method for floating structures described in this section is based on the assumption that existing elevated structures including piles placed on the bottom of the ground and floor slabs supported by the replacement are installed. Along the extending direction, the existing floor slab is perforated to form an opening, and the operation of placing a new pile from the opening is repeated a plurality of times. At this time, in order to use the new pile as the installation location of the bridge crane, the pile head of the new pile protrudes on the existing floor slab or is the same height as the existing floor slab (depending on the installation mode of the bridge crane) The new pile will be installed so that it will be lower than the existing floor slab. And the new pile piled up in multiple rows is used as an installation place of a bridge crane. In addition, while moving the bridge crane so that it moves over the new pile, the bridge crane can be used to load and drive new piles, and the existing floor slab and existing piles can be dismantled and carried out. The overwater structure will be removed. Then, while moving the bridge crane as if moving the new pile, installing a new floor slab on the new pile and reconstructing the elevated structure on the water, limiting the work space in part of the work area Even in such a case, it is possible to reconstruct the water elevated structure at the same location as the existing elevated structure.

  (2) In the step (1) of removing the existing elevated structure, a hole is drilled from the existing floor slab to form an opening, and a new pile is driven from the opening to the water bottom ground immediately below it. Then, at least a rail having a length straddling two or more new piles arranged in the extending direction of the existing elevated structure and a bridge crane movable on the rail are transferred to the adjacent new pile. After installation of the bridge crane and rail, move the bridge cranes and rails as appropriate, drill holes from the existing floor slab at a position avoiding the existing piles, and open the new piles Of the above-mentioned floating elevated structure that repeats the work of placing a new pile from the opening to the bottom ground immediately below it, and the dismantling and unloading work of the existing floor slab and the existing pile. Replacement method (Claim 2).

  The replacement method for floating structures described in this section is the process of removing existing elevated structures by drilling from the existing floor slab to form openings, and from the openings to the bottom ground immediately below The operation of placing a pile and placing a new pile so as to protrude from the opening onto the existing floor slab is repeated several times. In addition, the position where drilling is performed from the existing floor slab is, as a rule, a position avoiding the existing pile. However, when it is necessary to place a new pile at a position that matches the existing pile due to the placement pitch of the existing pile and the new pile, etc. After removing the existing pile, a new pile will be placed. And the new pile piled up in multiple rows is utilized as an installation place of the rail which is a guide means of a bridge crane. This rail has a length that extends over at least two rows of new piles arranged in the extending direction of the existing elevated structure, and at least one row of rails is moved when moving to adjacent new piles. Movement can be performed with the rail held on the new pile. And after installation of a bridge crane and a rail, a bridge crane and a rail are moved suitably, and the movement range of a bridge crane is shifted to the direction where the existing elevated structure is extended. And in the position avoiding the existing pile, drilling from the existing floor slab to form an opening, loading the new pile, and placing the new pile on the water bottom ground directly below the opening, and the existing The dismantling and unloading work of floor slabs and existing piles are repeated in the extending direction of the existing elevated structure using a bridge crane, and the existing elevated structure is removed.

  (3) In the above-described steps (1) and (2), in the step of reconstructing the above-mentioned elevated structure, a rail having a length that extends over at least two rows of new piles arranged in the extending direction of the existing elevated structure Is installed so as to straddle at least the two or more new piles, and a receiving girder is installed between the new pile located in the middle of the rail and the adjacent new pile, and the new girder is installed using the receiving girder. Replacement method for floating elevated structures on which floor slabs are installed (Claim 3).

  The method of replacing the elevated structure described in this section is the process of rebuilding the elevated structure after the removal of the existing elevated structure, at least two rows aligned in the extending direction of the existing elevated structure. Install a rail with a length over the new pile so that it spans at least the two or more new piles, and use a bridge crane to establish a new pile located in the middle of the rail and a new pile adjacent to it. A girder is installed between the two. And the construction material of a new floor slab is carried in with a bridge crane, and a new floor slab is installed in a receiving girder.

(4) In the above paragraphs (1) to (3), a method for replacing an elevated structure in which a material ship is carried in and a dismantled material is carried out by placing a trolley directly under the bridge crane (claim 4). ).
The method of replacing the elevated structure described in this section is that the construction area is on the water, the process of removing the existing elevated structure, and the subsequent process of reconstructing the elevated structure, The use of vehicles for carrying in and carrying out dismantled materials is greatly limited, but instead, it is carried out through the water by a trolley that is placed directly under the bridge crane.

(5) The method of removing the existing elevated structure and the subsequent process of rebuilding the elevated structure using the same bridge crane, Claim 5).
The replacement method for the floating structure described in this section uses the same bridge crane for the process of removing the existing elevated structure and the subsequent process of rebuilding the elevated structure. By operating at the same time, the operation efficiency of the bridge crane will be improved. Also, depending on the conditions, it can contribute to shortening the construction period.

  Since this invention was comprised in this way, it becomes possible to perform the replacement work of a water elevated structure smoothly in the water work area which is restrict | limited to at least one part work space.

BRIEF DESCRIPTION OF THE DRAWINGS It shows the 1st step of the removal process of the existing overwater structure of the replacement method of the overwater structure according to the embodiment of the present invention, (a) is a side view, (b) is a plan view. is there. FIG. 2 shows a second step following FIG. 1, (a) is a side view, and (b) is a plan view. FIG. 3 shows a third step following FIG. 2, (a) is a side view, and (b) is a plan view. FIG. 4 shows a fourth step subsequent to FIG. 3, (a) is a side view, and (b) is a plan view. FIG. 5 shows a fifth step subsequent to FIG. 4, wherein (a) is a side view and (b) is a plan view. FIG. 6 shows a sixth step following FIG. 5, wherein (a) is a side view and (b) is a plan view. FIG. 7 shows a seventh step subsequent to FIG. 6, (a) is a side view, and (b) is a plan view. FIG. 8 shows an eighth step subsequent to FIG. 7, wherein (a) is a side view and (b) is a plan view. FIG. 9 shows a ninth step subsequent to FIG. 8, wherein (a) is a side view and (b) is a plan view. FIG. 10 shows a tenth step following FIG. 9, wherein (a) is a side view and (b) is a plan view. BRIEF DESCRIPTION OF THE DRAWINGS It shows the 1st step of the rebuilding process of the existing elevated water structure of the replacement method of the elevated water structure according to the embodiment of the present invention, (a) is a side view, (b) is a plan view. It is. FIG. 12 shows a second step following FIG. 11, where (a) is a side view and (b) is a plan view. FIG. 13 shows a third step subsequent to FIG. 12, in which (a) is a side view and (b) is a plan view. FIG. 14 shows a fourth step subsequent to FIG. 13, (a) is a side view, and (b) is a plan view. FIG. 15 shows a fifth step subsequent to FIG. 14, wherein (a) is a side view and (b) is a plan view. FIG. 16 shows a sixth step following FIG. 15, where (a) is a side view and (b) is a plan view. FIG. 17 shows a seventh step following FIG. 16, in which (a) is a side view and (b) is a plan view. FIG. 18 shows an eighth step following FIG. 17, (a) is a side view, and (b) is a plan view. It is a more detailed explanatory view about the 7th step of the reconstruction process of the existing elevated structure shown in FIG. 17, (a), (b) is a longitudinal sectional view and a plane showing the installation process of the foam block FIGS. 3C and 3D are a longitudinal sectional view and a plan view showing a process for placing the cast-in-place concrete 42.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.
The method of replacing an elevated structure according to an embodiment of the present invention is to replace an existing elevated road in a case where, for example, a railway line and an elevated road are laid in parallel on a canal. It is suitable for cases where it is necessary to replace the frame structure while being restricted by the work space. FIGS. 1-10 is the process of removing the existing elevated structure 16 including the pile (existing pile) 12 laid in the underwater ground G and the floor slab (existing floor slab) 14 supported by the pile. It is shown and the existing elevated structure over the entire construction area is removed by repeating the steps shown in FIGS. Moreover, FIGS. 11-18 shows the process of reconstructing after removal of the existing elevated structure. By repeating the steps shown in FIGS. The elevated structure (new construction) 44 is reconstructed.

  For convenience of explanation, the steps in FIGS. 1 to 10 are referred to as “steps 1 to 10” in the process of removing the existing elevated structure 16, and the steps in FIGS. The steps will be described in order as “steps 1 to 8” in the process of 44 reconstruction.

(Removal process of existing overwater structures)
(Step 1) As shown in FIG. 1, the existing floor slab 14 is perforated along the direction in which the existing elevated structure 16 extends to form an opening 18. The opening 18 is formed by drilling from the existing floor slab 14 at a position avoiding the existing pile 12. Then, the new pile 20 is driven from the opening 18 to the water bottom ground G immediately below the opening 18. At this time, the pile head of the new pile 20 is driven so as to protrude from the opening 18 onto the existing floor slab 14. By repeating this process, at least two rows (three rows in the illustrated example) of new piles 20 that are arranged in the extending direction of the existing elevated structure 16 are driven. The work related to the placement of the new pile 20 up to this point is performed from the existing floor slab 14 or from the water adjacent to the existing elevated structure 16 by a known method.
And the rail 22 which has the length which straddles the new pile 20 of 3 rows, and the bridge crane 24 which can move on the rail 22 are installed so that it can move to the adjacent new pile 20, and it can move. In the illustrated example, the rails 22 have a length straddling four rows of new piles 20 in the direction in which the existing elevated structure 16 extends (see FIG. 5 and subsequent figures), and two rails 22 are used in parallel. Is installed to be movable on the two rails 22.

In the illustrated example, both the existing pile 12 and the new pile 20 are steel pipe piles, and the new pile 20 has a larger diameter that can handle a larger load than the existing pile 12, and the existing elevated structure. The installation interval in the direction in which the object 16 extends is also larger in the new pile 20 than in the existing pile 12, but these relationships are appropriately determined in consideration of construction conditions and the like. And the rail 22 is installed on the pile head of the new pile 20 by installing the rail 22 via a known slide device 26 (see, for example, the devices described in Patent Documents 1 and 2, etc.) and the cap 28. It is possible to move in the direction in which the existing elevated structure 16 extends so as to change over the new pile 20.
The bridge crane 24 is a rail 22 having a minimum height that can carry in and place the new pile 20 and disassemble and carry out the existing floor slab 14 and the existing pile 12. By installing so as to straddle, smooth operation is possible in the work area that is restricted by the work space. The bridge crane 24 used here is a so-called overhead crane in which the lengths of the feet at both ends are adjusted in accordance with the above-mentioned limitations on the work space, and there is also a crane that does not substantially provide the feet at both ends. Shall be included. Further, the structure of the trolley is appropriately selected from a club trolley type, a rope trolley type, a hoist type, a mantrol type, and the like. Furthermore, depending on the construction environment, a low-floor jib crane or the like is included. A known mechanism may be adopted as a mechanism for moving the bridge crane 24 on the rail 22. In the subsequent operations, the bridge crane 24 is used as appropriate even when not specifically mentioned. In FIG. 1, a member denoted by reference numeral 30 is a floor slab support for supporting a load of a new floor slab 34 described later.

(Step 2) As shown in FIG. 2, an opening 18 for drilling the next new pile 20 is drilled further in the direction in which the existing elevated structure 16 extends.
(Step 3) As shown in FIG. 3, the new pile 20 is driven so that the pile head protrudes on the existing floor slab 14 from the newly opened opening 18 to the water bottom ground G immediately below.
(Step 4) As shown in FIG. 4, the cap 28 is installed on the pile head of the new pile 20. The cap 28 is for stably installing the slide device 26 and adjusting the height of the slide device 26.
(Step 5) As shown in FIG. 5, the slide device 26 is installed on the cap 28 of the newly installed pile 20 placed in Step 3, and the rail 22 is slid so as to reach the upper side, and the tip of the rail 22 is placed. The part is supported by the slide device 26.
(Step 6) As shown in FIG. 6, the existing floor slab 14 is cut along a cutting line CL so that it can be easily carried out.
(Step 7) As shown in FIG. 7, the trolley 32 is loaded from above the water surface W directly below the bridge crane 24, and the demolition 14P of the existing floor slab 14 is trolleyed using the bridge crane 24. No. 32 and carry out from the work area. Instead of using the trolley 32, the vehicle may be carried on a newly constructed floor slab that has already been constructed (hereinafter, the same applies when the trolley 32 is used).
(Step 8) As shown in FIG. 8, the existing pile 12 remaining after the existing floor slab 14 is removed is removed using a bridge crane 24. The removed existing pile 12 is also loaded onto the carriage 32 using the bridge crane 24 and carried out of the work area, as in FIG.
(Step 9) As shown in FIG. 9, the floor slab support 30 is installed on the new pile 20 from which the existing pile 12 and the existing floor slab 14 are removed. In carrying material at this time, similarly to FIG. 7, the carriage 32 is placed directly under the bridge crane 24, and the bridge crane 24 is used for installation work.
(Step 10) As shown in FIG. 10, the rail 22 is slid further in the extending direction of the existing elevated structure 16, and then the process returns to Step 1 (FIG. 1).

(Reconstruction process of floating structure over water)
(Step 1) As shown in FIG. 11, the rear end portion in the traveling direction of the rail 22 in a state where the rail 22 is held by the slide device 26 installed on the cap 28 of the pile head of the three new piles 20 Is held by the slide device 26 installed at the tip of the new floor slab 34 held by the new pile 20 (refer to the following for the construction procedure of the new floor slab 34).
(Step 2) As shown in FIG. 12, the slide device 26 and the cap 28 are removed from the new pile 20 (located in the middle of the rails 22) one row ahead of the new pile 20 to which the new floor slab 34 has already been extended. . Even in this state, the rail 22 is stably held by the other slide device 26.
(Step 3) As shown in FIG. 13, the pile head of the new pile 20 from which the slide device 26 and the cap 28 are removed is adjusted (cut) to a height suitable for the installation of the new floor slab 34. The bridge crane 24 is also used for cutting the new pile 20.
(Step 4) As shown in FIG. 14, a receiving girder 36 is installed between the new pile 20 in which the new floor slab 34 has already been extended and the new pile 20 whose height is adjusted in one row ahead. . The bridge crane 24 is also used for the installation work of the receiving beam 36.
(Step 5) As shown in FIG. 15, a table ship 32 loaded with a precast plate 38 is loaded from above the water surface W directly below the bridge crane 24, and the precast plate 38 is installed using the bridge crane 24. Then, it is installed on the floor slab holder 30 and the receiving beam 36 (note that the carriage 32 is also used when the receiving beam 36 is installed).
(Step 6) As shown in FIG. 16, the precast plate 38 is installed so as to fill in the space between the two new piles 20 in which the receiving girders 36 are installed.

(Step 7) As shown in FIG. 17, the necessary structure (FIG. 19) is constructed on the precast plate 38, and the completed portion of the new floor slab 34 is extended by the distance of the two rows of new piles 20. .
As a procedure at this time, as shown in FIGS. 19A and 19B, a foam block 40 (or water-resistant cardboard) such as an EPS material is installed on the upper surface of the precast plate 38. At this time, each foam material block 40 is installed so as to form a lattice-like gap between the foam material blocks 40, and reinforcing bars are assembled in the lattice-like gap. Then, as shown in FIGS. 19 (c) and 19 (d), cast-in-place concrete (RC floor slab) 42 is placed so as to fill the reinforcing bars built in the foam material blocks 40 and their lattice-like gaps. Thus, the new floor slab 34 is constructed. Thus, by constructing the new floor slab 34 with the precast ground 38 and the foam material block 40, the construction period can be shortened, salt damage countermeasures can be taken, and the durability can be improved.
(Step 8) As shown in FIG. 18, the rail 22 is slid so that the rear end portion of the rail 22 is positioned at the front end portion of the extended new floor slab 34, and the rear end portion in the traveling direction of the rail 22 is It hold | maintains with the slide apparatus 26 installed in the front-end | tip part of the new floor slab 34 with which the new pile 20 was hold | maintained, and returns to step 1 (FIG. 11) after that.

According to the embodiment of the present invention configured as described above, the following operational effects can be obtained.
First, as shown in FIG. 1 to FIG. 10, when replacing a floating structure 16 including a pile 12 placed on the bottom ground G and a floor slab 14 supported by the pile 12, an existing elevated structure is used. Along the extending direction of the structure 16, the existing floor slab 14 is perforated to form the opening 18, and the operation of driving the new pile 20 so as to protrude from the opening 18 onto the existing floor slab 14 is repeated a plurality of times. Thus, the new piles 20 placed in a plurality of rows are used as the installation location of the bridge crane 24. In addition, while the bridge crane 24 is moved so as to transfer the new pile 20, the bridge crane 24 is used to carry in and place the new pile 20, and the existing floor slab 14 and the existing pile 12 are disassembled and carried out. The existing overwater structure 16 is removed by performing the above. After that, as shown in FIGS. 11 to 18, while the bridge crane 24 is moved so as to transfer the new pile 20, the new floor slab 34 is installed on the new pile 20, and the overpass structure 44 Thus, even if the work space is restricted in a part of the work area, the overwater structure 44 is reconstructed in the same place as the existing elevated structure 16. Therefore, it is possible to smoothly perform the replacement work of the floating structure.

  Moreover, in the process (FIGS. 1 to 10) of removing the existing elevated structure 16 (FIGS. 1 to 10), an opening 18 is formed by drilling from the existing floor slab 14 at a position avoiding the existing pile 12. The new pile 20 is placed in a plurality of rows by repeating the operation of placing the new pile 20 on the water bottom ground G immediately below and placing the new pile 20 so as to protrude from the opening 18 onto the existing floor slab 14. 20 is used as an installation place of the rail 22 which is a guide means of the bridge crane 24. This rail 22 has a length straddling three rows of new piles 20 arranged in the extending direction of the existing elevated structure 16, and when moving the rail 22 so as to transfer to the adjacent new pile 20, The rail 22 can be stably moved with the rails 22 held by at least two rows of the new piles 20. In addition, by reinforcing the slide device 26 of the bridge crane 24, the rail 22 having a length straddling the two new piles 20 is used, and the rail 22 is moved so as to be transferred to the adjacent new pile 20. In this case, the rail 22 can be stably moved in a state where the rails 22 are held by the row of new piles 20. After the bridge crane 24 and the rail 22 are installed, the bridge crane 24 and the rail 22 are appropriately moved to shift the moving range of the bridge crane 24 in the extending direction of the existing elevated structure 16. Go. Thereafter, drilling is performed from above the existing floor slab 14 to form an opening 18 at a position avoiding the existing pile 12, and the new pile 20 is carried in. The installation work and the dismantling and unloading work of the existing floor slab 14 and the existing pile 12 are repeated in the extending direction of the existing elevated structure 16 using the bridge crane 24 to remove the existing floating structure 16. Is.

  Moreover, in the process (FIGS. 11 to 18) of reconstructing the elevated water structure 44 after the removal of the existing elevated structure 16, the three new piles 20 arranged in the extending direction of the existing elevated structure 16 are straddled. A rail 22 having a length is installed so as to straddle the three rows of new piles 20, and a new pile 20 located in the middle of the rails 22 and a new pile 20 adjacent to the rails 22 by using a bridge crane 24. A receiving girder 36 is installed between them (FIG. 14), and the components (precast plate 38, foam block 40, cast-in-place concrete 42) of the new floor slab 24 shown in FIG. Thus, a new floor slab 44 is installed on the receiving beam 36.

In addition, in the process of removing the existing elevated structure 16 and the subsequent process of reconstructing the elevated structure 44, the carriage 32 that is placed directly under the bridge crane 24 is used over the water. By doing so, it is possible to smoothly carry in materials and carry out dismantled materials.
In this description, the process of removing the existing elevated structure 16 (FIGS. 1 to 10) and the process of reconstructing the subsequent elevated structure 44 (FIGS. 11 to 18) are separate processes. However, it is possible to improve the operational efficiency of the bridge crane 24 by simultaneously using the same bridge crane 24 as appropriate, and it may contribute to shortening the construction period depending on conditions. .

  12: Existing pile, 14: Existing floor slab, 16: Existing elevated structure, 18: Opening, 20: New pile, 22: Rail, 24: Bridge crane, 26: Slide device, 32: Dolly, 34: New floor slab, 36: Girder, 38: Precast version, 40: Foam block, 42: Cast-in-place concrete, 44: Overwater structure (new)

Claims (5)

It is a construction method to replace a floating structure including a pile placed on the bottom of the ground and a floor slab supported by the pile,
Along the extending direction of the existing elevated structure, drill the existing floor slab to form an opening, and repeat the work of placing a new pile from the opening multiple times,
Install a movable bridge crane so that it can be transferred over the new pile,
A step of carrying out removal and removal of an existing overwater structure by carrying in and placing further new piles using the bridge crane, dismantling and carrying out existing floor slabs and existing piles; and
Installing a new floor slab on the new pile and reconstructing the elevated structure
A method for replacing an elevated structure over water, which is performed along with the movement of the bridge crane. In the step of removing the existing overwater structure,
Perforated from the existing floor slab to form an opening, and a new pile is driven from the opening to the water bottom ground immediately below, and at least a length that extends over two or more new piles arranged in the extending direction of the existing elevated structure A rail having a thickness and a bridge crane movable on the rail so as to be transferred to an adjacent new pile,
After the installation of the bridge crane and rail, move them as appropriate, drill an opening from the existing floor slab at a position avoiding the existing pile, carry in the new pile, and carry it directly under the opening. The overwater structure according to claim 1, wherein the existing elevated structure is removed by repeating the operation of placing a new pile on the submerged ground and the dismantling and removal of the existing floor slab and the existing pile. Replacement method for structures. In the step of reconstructing the above-mentioned elevated structure, at least rails having a length straddling two or more new piles arranged in the extending direction of the existing elevated structure, at least the two or more new piles or new floor slabs It is installed so as to straddle the top, and a receiving girder is installed between a new pile located in the middle of the rail and a new pile adjacent thereto, and a new floor slab is installed using the receiving girder. A method for replacing the elevated structure according to claim 1 or 2. The method for replacing an elevated structure according to any one of claims 1 to 3, wherein a material ship is carried in and a dismantled object is carried out by placing a trolley directly under the bridge crane. 5. The method according to claim 1, wherein the step of removing the existing elevated structure and the subsequent step of rebuilding the elevated structure are simultaneously performed using the same bridge crane. Replacement method for floating structures according to item 1.

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