Method for relocating existing walls

Abstract

To provide a removal and reconstruction method of an existing wall capable of reducing the number of repair points provided on a wall surface of a restored existing wall when reinforcing the existing wall after its removal and reconstruction.SOLUTION: A removal and reconstruction method of an existing wall comprises: step S5 of constructing a newly constructed base 20 made of reinforcement concrete where a lower side anchoring body 23 is buried and connecting a reinforcement steel bar 21 extending in a vertical direction to the lower anchoring body 23; step S6 of assembling respective pieces CL, CU, WL, WU by hoisting them and lifting them down on the newly constructed base 20 while inserting the reinforcement steel bar 21 into through holes 27 of the respective pieces CL, CU, WL, WU; and step S7 of connecting the reinforcement steel bar 21 on an upper anchoring plate 31 in a state of arranging the upper anchoring plate 31 on upper surfaces of the assembled pieces CL, CU, WL, WU and introducing tension force to the reinforcement steel bar 21.SELECTED DRAWING: Figure 15

Description

Technical Field

[0001] The present invention relates to a method for relocating an existing wall such as a masonry structure.

Background Art

[0002] Conventionally, reinforcing a building with a masonry structure that is a cultural heritage has been carried out (see Patent Documents 1 and 2). Patent Document 1 shows a method for reinforcing an existing brick wall. Specifically, after attaching a fixing plate to the lower end of a PC steel bar through a horizontal hole formed in the foundation of the brick wall, the horizontal hole is filled with early-strength concrete and fixed. A compressive force is applied between the upper end and the lower end of the brick wall by a plurality of PC steel bars through which a tensile force is applied. Patent Document 2 shows a reinforcing structure for a masonry structure. The reinforcing structure for a masonry structure includes a horizontal hole formed on the side surface of the masonry wall, a through hole formed downward from the upper end of the wall and communicating with the horizontal hole, a tension member fixing hole formed below the through hole and further downward from the horizontal hole, and a tension member extending from the upper end of the wall to the tension member fixing hole. The lower end of the tension member is fixed together with a fixing plate in the tension member fixing hole by a filler, and the upper part is fixed in a state where a tension is applied.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] An object of the present invention is to provide a method for relocating an existing wall, which can reduce repair locations provided on the wall surface of the restored existing wall when relocating and reinforcing the existing wall.

Means for Solving the Problems

[0005] The method for relocating an existing wall according to the first invention is a method for relocating an existing wall (for example, the exterior wall portion 1 of a building described later), comprising: a first step (for example, steps S1 to S3 described later) of dividing the existing wall into a plurality of horizontally arranged pieces (for example, pieces CL, CU, WL, WU described later); and a second step (for example, step S5 described later) of constructing a reinforced concrete foundation (for example, a new foundation 20 described later) in which a lower anchoring body (for example, a lower anchoring body 23 described later) is embedded, and joining a reinforcing steel rod (for example, a reinforcing steel rod 21 described later) extending vertically to the lower anchoring body. The method is characterized by comprising: a third step (for example, step S6 described later) of assembling the pieces by forming vertically extending through holes (for example, through holes 27 described later) in each piece, lifting each piece, and lowering it onto the foundation while inserting the reinforcing steel rods through the through holes; and a fourth step (for example, step S7 described later) of placing an upper anchoring body (for example, an upper anchoring plate 31 described later) on the upper surface of the assembled piece, introducing tension to the reinforcing steel rods, and joining the reinforcing steel rods to the upper anchoring body in this state.

[0006] According to this invention, a lower anchoring body is embedded in the foundation, and a reinforcing steel rod extending vertically is joined to this lower anchoring body. Next, the pieces are placed on the upper surface of the foundation while inserting the reinforcing steel rod through holes formed in the pieces. Thus, the through holes formed in each piece extend from the lower surface to the upper surface of each piece. Next, an upper anchoring body is placed on the upper surface of the assembled pieces, tension is introduced into the reinforcing steel rod, and in this state, the reinforcing steel rod is joined to the upper anchoring body. This introduces compressive force into each piece, thereby reinforcing the restored existing wall. Furthermore, since through-holes are provided from the bottom surface to the top surface of each piece, there is no need to provide openings on the sides of each piece for joining reinforcing steel rods to the lower anchoring body, as in conventional methods, thus reducing the number of repair points on the restored existing wall surface.

[0007] The method for relocating an existing wall according to the second invention is characterized in that, in the first step, each piece is further divided into lower pieces (e.g., CL, WL as described later) and upper pieces (e.g., CU, WU as described later), and in the third step, a height adjustment member (e.g., a spacer 26 as described later) is provided on the upper surface of the foundation, and the lower pieces are placed on the height adjustment members on the foundation, and / or a height adjustment member is provided on the upper surface of the lower pieces, and the upper pieces are placed on the height adjustment members on the lower pieces.

[0008] According to this invention, if a height adjustment member is provided on the upper surface of the foundation and the lower piece is placed on this height adjustment member on the foundation, the horizontal accuracy of the lower piece can be ensured. Furthermore, if a height adjustment member is provided on the upper surface of the lower piece and the upper piece is placed on this height adjustment member on the lower piece, the horizontal accuracy of the upper piece can be ensured.

[0009] The method for relocating an existing wall according to the third invention is characterized in that, in the fourth step, the upper fixing body is placed on the upper surface of the assembled piece or in a recess provided on the upper surface of the assembled piece, tension is introduced to the reinforcing steel rod, and then a filler material (for example, the filler material 28 described later) is filled into the gap between the reinforcing steel rod and the through hole.

[0010] According to this invention, by placing the upper fixing body on the upper surface of the assembled piece or in a recess provided on the upper surface of the assembled piece, compressive force can be reliably introduced to each piece via the reinforcing steel rod. Furthermore, since the gap between the reinforcing steel bar and the through-hole is filled with a filler material after tension is applied to the reinforcing steel bar, the tension applied to the reinforcing steel bar can be easily maintained. [Effects of the Invention]

[0011] According to the present invention, when relocating and reinforcing an existing wall, a method for relocating an existing wall can be provided that reduces the number of repair points on the wall surface of the restored existing wall. [Brief explanation of the drawing]

[0012] [Figure 1]Front view and plan view of the outer wall portion of a building to which the method for relocating an existing wall according to the first embodiment of the present invention is applied. [Figure 2] A - A cross - sectional view of the outer wall portion in FIG. 1. [Figure 3] Front view and plan view of the restored outer wall portion according to the first embodiment. [Figure 4] B - B cross - sectional view of the restored outer wall portion in FIG. 3. [Figure 5] An enlarged view of the portion of the restored outer wall portion in FIG. 4 surrounded by the broken line C. [Figure 6] E - E cross - sectional view of the restored outer wall portion in FIG. 5. [Figure 7] An enlarged view of the portion of the restored outer wall portion in FIG. 4 surrounded by the broken line D. [Figure 8] F - F arrow - view of the restored outer wall portion in FIG. 7. [Figure 9] A flowchart of the relocation procedure of the outer wall portion according to the first embodiment. [Figure 10] An explanatory diagram of the relocation procedure of the outer wall portion according to the first embodiment (Part 1: A diagram showing the division position of the outer wall portion and the attachment position of the reinforcing member). [Figure 11] A longitudinal sectional view of the reinforcing member. [Figure 12] An explanatory diagram of the relocation procedure of the outer wall portion according to the first embodiment (Part 2: A diagram showing the removal status of the pieces CL and WL). [Figure 13] An explanatory diagram of the relocation procedure of the outer wall portion according to the first embodiment (Part 3: A longitudinal sectional view of the newly constructed foundation). [Figure 14] An explanatory diagram of the relocation procedure of the outer wall portion according to the first embodiment (Part 4: A diagram showing the attachment status of the piece CL). [Figure 15] An explanatory diagram of the relocation procedure of the outer wall portion according to the first embodiment (Part 5: A diagram showing the attachment status of the piece WL). [Figure 16] A schematic diagram of the outer wall portion used for calculating the tensile force introduced into the PC steel bar. [Figure 17] A longitudinal sectional view of the upper part of the restored outer wall portion according to the second embodiment of the present invention. [Figure 18]It is a longitudinal sectional view of a part of the restored outer wall portion according to a modified example of the present invention.

Embodiments for Carrying Out the Invention

[0013] The present invention is a method for transplanting an existing wall. Reinforcing steel bars are joined to a foundation made of reinforced concrete, and while inserting the reinforcing steel bars into the through-holes of each piece, each piece is suspended and assembled on the upper surface of the foundation to restore the existing wall. At the same time, a tensile force is introduced into the reinforcing steel bars inserted into the through-holes of each piece to reinforce the restored existing wall. Hereinafter, embodiments of the present invention will be described based on the drawings. In the description of the following embodiments, the same reference numerals are given to the same constituent elements, and the description thereof is omitted or simplified. 〔First Embodiment〕 FIG. 1(a) is a front view of an outer wall portion 1 of a building as an existing wall to which the method for transplanting an existing wall according to the first embodiment of the present invention is applied. FIG. 1(b) is a plan view of the outer wall portion 1 in FIG. 1(a). FIG. 2 is a sectional view taken along the line A-A of the outer wall portion 1 in FIG. 1(a). The outer wall portion 1 of the building is a masonry structure, and includes a foundation portion 10 constructed on the ground surface 2 and extending horizontally, column portions 11 provided at predetermined intervals on the foundation portion 10, and wall portions 12 provided between the column portions 11 on the foundation portion 10. Windows 14 and panels 15 are fitted into the central openings 13 of each wall portion 12.

[0014] The above outer wall portion 1 of the building is transplanted and restored. FIG. 3(a) is a front view of the restored outer wall portion 1A, and FIG. 3(b) is a plan view of the restored outer wall portion 1A in FIG. 3(a). FIG. 4 is a sectional view taken along the line B-B of the restored outer wall portion 1A in FIG. 3(a). The restored outer wall portion 1A of the building is constructed on a new foundation 20. The new foundation 20 is made of reinforced concrete constructed on the ground surface 2. Between the new foundation 20 and the upper end surface of the restored outer wall portion 1A, reinforcing steel bars 21 into which a tensile force has been introduced are provided at predetermined intervals, whereby the restored outer wall portion 1A is reinforced.

[0015] Figure 5 is an enlarged view of the portion enclosed by the dashed line C of the restored exterior wall section 1A in Figure 4. Figure 6 is a cross-sectional view EE of the restored exterior wall section 1A in Figure 5. A recess 22 is formed in the new foundation 20 at the location of the reinforcing steel rod 21. A lower anchoring body 23 is embedded inside the new foundation 20. This lower anchoring body 23 comprises an anchoring body body 24 anchored to the new foundation 20 and a cylindrical joint portion 25 provided on the anchoring body body 24 and exposed in the recess 22. A female thread is formed inside the joint portion 25. Male threads are formed at the upper and lower ends of the reinforcing steel rod 21, and the female thread at the lower end of the reinforcing steel rod 21 is screwed into the female thread of the joint portion 25. Furthermore, spacers 26 are appropriately placed on the new foundation 20 as height adjustment materials, and the restored exterior wall section 1A (pieces CL, WL) of the building is placed on these spacers 26. The restored building's exterior wall section 1A is provided with a through-hole 27 that extends vertically from the lower end surface to the upper end surface of the exterior wall section 1A, and the reinforcing steel rod 21 is inserted through this through-hole 27. The gap between the through-hole 27 and the reinforcing steel rod 21, and the gap between the upper surface of the new foundation 20 and the lower end surface of the exterior wall section 1A are filled with a filler material 28.

[0016] Figure 7 is an enlarged view of the area enclosed by the dashed line D in the restored exterior wall section 1A of Figure 4. Figure 8 is a view of the restored exterior wall section 1A of Figure 7 from the perspective of arrow FF. The upper end surface of the restored building's exterior wall section 1A is covered entirely by a plate 30, and an upper anchoring plate 31 is positioned directly above the reinforcing steel rod 21 on this plate 30. The reinforcing steel rod 21 penetrates both the plate 30 and the upper anchoring plate 31. With tension applied to the reinforcing steel rod 21, a nut 32 is screwed onto the upper end of the reinforcing steel rod 21 and tightened, causing the nut 32 to lock onto the upper anchoring plate and maintaining the tension applied to the reinforcing steel rod 21.

[0017] Furthermore, a reinforcing column-beam frame 40 is constructed inside the restored outer wall section 1A to reinforce the outer wall section 1A from the inside. The reinforcing column-beam frame 40 comprises reinforcing columns 41, which are H-shaped steel beams extending vertically along the inner wall surface of the column section 11 (pieces CL, CU); reinforcing beams 42, which are H-shaped steel beams connecting the upper ends of the reinforcing columns 41; and a top joint (not shown) connecting the reinforcing beams 42 to the upper end surface of the outer wall section 1A.

[0018] The procedure for relocating the building's exterior wall section 1 will be explained below, referring to the flowchart in Figure 9. In step S1, as shown in Figure 10, the division points (shown by dashed lines in Figure 10) for dividing the building's exterior wall 1 into multiple pieces, and the attachment points for the reinforcing members 50 of each piece are set. Specifically, the outer wall section 1 is divided into two vertical sections and seven horizontal sections, for a total of 14 pieces CL, CU, WL, and WU, so that it can be lifted by lifting equipment such as cranes. Piece CL is the lower part (lower piece) of the column section 11, and piece CU is the upper part (upper piece) of the column section 11. Piece WL is the lower part (lower piece) of the wall section 12, and piece WU is the upper part (upper piece) of the wall section 12. Reinforcing members 50 are placed at two locations, top and bottom, for each of these pieces CL, CU, WL, and WU.

[0019] In step S2, the reinforcing member 50 is actually attached to the exterior wall section 1 of the building. Figure 11 is a longitudinal cross-sectional view of the reinforcing member 50. The reinforcing member 50 comprises a pair of H-shaped steel beams 52 arranged on both sides of the outer wall portion 1 with a plate-shaped rubber plate 51 in between, and a PC steel bar 53 that penetrates the outer wall portion 1 and has both ends locked to the outer surfaces of the pair of H-shaped steel beams 52. Nuts 54 are screwed onto both ends of the PC steel bar 53. These nuts 54 are locked to the H-shaped steel bar 52 when tension is applied to the PC steel bar 53. A center hole jack 55 is attached to one end of the PC steel bar 53, and tension is applied to the PC steel bar 53 by this center hole jack 55.

[0020] In step S3, the exterior wall section 1 of the building is actually cut at the division points using a cutting cutter or the like to divide it into pieces CL, CU, WL, and WU. Each divided piece CL, CU, WL, and WU is then lifted and temporarily placed in a temporary storage space (not shown). Specifically, as shown in Figures 12(a) and 12(b), each piece CL, CU, WL, and WU is lifted by attaching a lifting jig 60 to the reinforcing member 50 of each piece CL, CU, WL, and WU and lifting them with a lifting device 70. Here, the order in which each piece CL, CU, WL, and WU is cut and lifted is the order of the numbers circled in Figure 10. As shown in Figures 12(a) and 12(b), the lifting jig 60 comprises a lifting jig body 61 constructed by assembling H-shaped steel beams in a grid pattern, and a lifting wire 62 attached to the lifting jig body 61. The lower reinforcing member 50 and the upper reinforcing member 50 are connected by a connecting member (not shown), the lifting wire 62 of the lifting jig 60 is connected to the upper reinforcing member 50, and the lifting wire 71 of the lifting device 70 is connected to the lifting jig body 61 of the lifting jig 60. In this state, the lifting device 70 is driven to lift each piece CL, CU, WL, and WU.

[0021] In step S4, each piece CL, CU, WL, and WU is transported to the relocation site. Specifically, each piece CL, CU, WL, and WU, which has been temporarily placed in the temporary storage yard, is lifted by the lifting device 70, loaded onto the cargo bed of a transport vehicle such as a trailer, and transported to the relocation site. In step S5, as shown in Figure 13, a new reinforced concrete foundation 20 is constructed in advance at the relocation site, and reinforcing steel rods 21 are joined to the lower anchoring body 23 of the new foundation 20. In addition, spacers 26 are appropriately placed on the new foundation 20 as height adjustment members.

[0022] In step S6, as shown in Figures 14 and 15, each piece CL, CU, WL, and WU is assembled on the new foundation 20. Specifically, first, holes are drilled in each piece CL, CU, WL, and WU to create through holes 27 that extend from the lower end face to the upper end face of each piece. Next, each piece CL, CU, WL, and WU is lifted using a lifting device 70 and lowered onto the new foundation 20 while inserting the reinforcing steel rods 21 of the new foundation 20 into the through holes 27 of each piece CL, CU, WL, and WU, thereby assembling them on the new foundation 20. This restores the exterior wall section 1A of the building, as shown in Figures 3 and 4. Figures 14 and 15 show examples of the installation of each piece CL, CU, WL, and WU. Figure 14 shows the installation of piece CL, and Figure 15 shows the installation of piece WL. The order in which pieces CL, CU, WL, and WU are installed is as shown by the numbers circled in Figure 3.

[0023] In step S7, tension is introduced to the reinforcing steel rod 21 to hold it in place. Specifically, the plate 30 and the upper anchoring plate 31 are placed on the upper end surface of the restored building's exterior wall section 1A. Next, a center hole jack (not shown) is attached to the upper end of the reinforcing steel rod 21 to introduce tension into the reinforcing steel rod 21. In this state, a nut 32 is tightened to the upper end of the reinforcing steel rod 21 to lock the reinforcing steel rod 21 to the upper anchoring plate 31. Next, filler material 28 is filled into the gap between the reinforcing steel rod 21 and the through hole 27, and into the gap between the upper surface of the new foundation 20 and the lower end surface of the exterior wall section 1A. Furthermore, while preventing each piece CL, CU, WL, and WU from tipping over using supports not shown in the diagram, the reinforcing member 50 is removed, and the reinforcing column-beam frame 40 is assembled as appropriate inside each piece CL, CU, WL, and WU. In this way, all pieces CL, CU, WL, and WU are attached and assembled.

[0024] [Calculation of tension force to be applied to PC steel bars] The tension force to be introduced into the PC steel bars of the reinforcing members is determined below. If pieces WL and WU are shaped as shown in Figure 16, the upper piece WU will be heavier than the lower piece WL. Specifically, the weight P of piece WU with the reinforcing member attached is 7.22t. If tension is applied to 4 of the 5 PC steel bars of the reinforcing member, the load W per PC steel bar can be calculated using the following equation (1). W=P / 4=7.22 / 4=1.805t=17.70kN (1)

[0025] The vertical resistance force N required per PC steel bar can be calculated using the following equation (2), assuming a friction coefficient μ = 0.3 and an impact load coefficient Ψ = 1.5. N = W / μ·Ψ =17.70 / 0.3·1.5···(2) = 88.50 kN

[0026] Since vertical resistance is caused by the two-sided friction of the H-shaped steel that fastens the piece WU, the axial force Ff required per PC steel bar can be calculated using the following equation (3). Ff = N / 2 = 44.25 kN ... (3)

[0027] This embodiment provides the following effects. (1) A lower anchoring body 23 is embedded in the new foundation 20, and a reinforcing steel rod 21 extending vertically is joined to this lower anchoring body 23. Next, the reinforcing steel rod 21 is inserted through the through holes 27 of each piece CL, CU, WL, WU, and these pieces CL, CU, WL, WU are placed on the upper surface of the new foundation 20. Next, an upper anchoring plate 31 is placed on the upper surface of the assembled pieces CL, CU, WL, WU, tension is introduced to the reinforcing steel rod 21, and in this state, the reinforcing steel rod 21 is joined to the upper anchoring plate 31. This introduces compressive force to each piece CL, CU, WL, WU, thereby reinforcing the restored exterior wall section 1A. Furthermore, since the through-holes 27 are provided from the bottom surface to the top surface of each piece CL, CU, WL, and WU, it is not necessary to provide openings on the sides of each piece CL, CU, WL, and WU for joining the reinforcing steel rods to the lower anchoring body, as in the conventional method, and the number of repair locations on the restored outer wall section 1A can be reduced.

[0028] (2) A spacer 26 is provided on the upper surface of the new foundation 20, and the lower pieces CL and WL are placed on the spacer 26 on the new foundation 20, so that the horizontal accuracy of the lower pieces CL and WL can be ensured. (3) By placing the upper fixing plate 31 on the upper surface of the assembled pieces CL, CU, WL, and WU, compressive force can be reliably introduced to each piece CL, CU, WL, and WU via the reinforcing steel rod 21. Furthermore, since the filler material 28 is filled into the gap between the reinforcing steel bar 21 and the through hole 27 after tension is applied to the reinforcing steel bar 21, the tension applied to the reinforcing steel bar 21 can be easily maintained.

[0029] [Second Embodiment] Figure 17 is a vertical cross-sectional view of the upper part of the restored outer wall portion 1A according to the second embodiment of the present invention. In this embodiment, a recess 33 is provided on the upper surface of the outer wall portion 1A, which is restored by assembling each piece CL, CU, WL, and WU, and an upper fixing plate 31 is provided in this recess 33, which is different from the first embodiment. According to this embodiment, the same effects as those described in (1) to (3) above are obtained.

[0030] Furthermore, the present invention is not limited to the embodiments described above, and any modifications, improvements, etc., that can achieve the objectives of the present invention are included within the scope of the present invention. For example, in each of the embodiments described above, a spacer 26 is provided on the upper surface of the new foundation 20, and the lower pieces CL and WL are placed on the spacer 26 on the upper surface of the new foundation 20, but the invention is not limited to this. For example, in addition to or instead of such a configuration, as shown in Figure 18, a spacer 26 may be provided on the upper surface of the lower pieces CL and WL, and the upper pieces CU and WU may be placed on the spacer 26 on the lower pieces CL and WL. Furthermore, in each of the embodiments described above, a new foundation 20 was constructed on the ground surface 2, and the exterior wall portion 1A of the building was restored on this new foundation 20. However, the invention is not limited to this, and the existing foundation portion 10 may be reused, and the exterior wall portion 1A of the building may be restored on this existing foundation portion 10. [Explanation of Symbols]

[0031] 1...Exterior wall of the building (existing wall) 1A...Restored exterior wall of the building 2...Ground level 10...Foundation 11...Column 12...Wall 13...Opening 14...Window 15...Panel 20...New building foundation 21...Reinforcement steel rod 22...Recess 23...Lower anchoring body 24…Main body of the fixing unit 25…Joint part 26…Spacer (height adjustment material) 27...Through hole 28...Filling material 30...Plate 31...Upper fixing plate (upper fixing body) 32...Nut 33...Recess 40...Reinforced column and beam frame 41...Reinforced column 42...Reinforced beam 50…Reinforcement member 51…Rubber plate 52…H-beam 53...PC steel bar 54...Nut 55...Center hole jack 60... Lifting jig 61... Lifting jig body 42... Lifting wire 70... Lifting device 71... Suspension wire CL...Lower piece of the column CU...Upper piece of the column WL...Lower piece of the wall WU...Upper piece of the wall

Claims

1. A method for relocating existing walls, The first step is to divide the existing wall into multiple pieces arranged horizontally, The second step involves constructing a reinforced concrete foundation in which the lower anchoring body is embedded, and joining reinforcing steel rods extending vertically to the lower anchoring body, A third step involves forming vertically extending through holes in each of the aforementioned pieces, lifting each piece, and lowering it onto the foundation while inserting the reinforcing steel rods through the through holes, thereby assembling the pieces. A method for relocating an existing wall, comprising: a fourth step of placing an upper anchoring body on the upper surface of the assembled piece, introducing tension to the reinforcing steel rod, and joining the reinforcing steel rod to the upper anchoring body in this state.

2. In the first step, each of the pieces is further divided into a lower piece and an upper piece. The method for relocating an existing wall according to claim 1, characterized in that, in the third step, a height adjustment member is provided on the upper surface of the foundation, and the lower piece is placed on the height adjustment member on the foundation, and / or a height adjustment member is provided on the upper surface of the lower piece, and the upper piece is placed on the height adjustment member on the lower piece.

3. The method for relocating an existing wall according to claim 1 or 2, characterized in that in the fourth step, tension is introduced to the reinforcing steel rod, and in this state, a filler is filled into the gap between the reinforcing steel rod and the through hole, thereby joining the reinforcing steel rod to the upper anchoring body.

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