Wall joining method

Abstract

To provide a wall joining method which facilitates chipping work for exposing a plate.SOLUTION: A wall joining method includes an excavation step in which a retaining wall 2 formed as a row of columns in which cylindrical first columnar bodies 7 and cylindrical second columnar bodies 8 are alternately arranged, and the first columnar body 7 is a columnar body of reinforced concrete with a cylindrical reinforcing bar cage 10 embedded inside, when the first columnar body 7 is constructed, the excavation step is a step of excavating the ground G between a pair of adjacent second columnar bodies 8 while overlapping with a pair of second columnar bodies 8 that have been constructed in parallel at a set interval in advance, to form a cylindrical excavation hole, a reinforcing bar cage installation step of dropping a reinforcing bar cage 10, which has a plate 1 attached to an outer surface of an underground outer wall side, into the excavation hole using rotation prevention means that prevents the reinforcing bar cage 10 from rotating, and a casting step of pouring concrete into the excavation hole in which the reinforcing bar cage 10 is installed.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a wall joining method in which an earth retaining wall is constructed with a plate embedded inside, the ground on the underground outer wall side of the earth retaining wall is excavated and then the surface of the earth retaining wall is chipped to expose the plate, a connector is attached to the exposed plate, and concrete for the underground outer wall is poured so as to bury the connector, thereby joining the underground outer wall to the earth retaining wall. [Background technology]

[0002] Patent Document 1 shows a wall joining method for joining an underground exterior wall to an earth retaining wall by constructing an earth retaining wall (underground continuous wall 1) with a plate (panel frame 11) embedded inside, chipping away the surface of the earth retaining wall to expose the plate, attaching a connector (connecting steel bar 4) to the exposed plate, and pouring concrete for the underground exterior wall (post-cast wall 2) so as to bury the connector. When using this wall joint construction method, it is also possible that the earth retaining wall is a composite column wall in which cylindrical first columns (reinforced concrete trailing columns 13) and cylindrical second columns (leading columns 12) are arranged alternately, as shown in Patent Document 2. By using this type of column wall as the earth retaining wall, it is possible to construct the earth retaining wall while removing underground obstacles such as existing underground structures, and because it is an all-casing construction method, the impact on neighboring structures can be reduced. When the retaining wall is to be a column wall as described above, a plate can be attached to the outer surface of a cylindrical reinforced concrete cage facing the underground exterior wall, the reinforced concrete cage can be dropped into the excavation hole, and then concrete can be poured into the hole to construct a first columnar body made of reinforced concrete, while embedding the plate into the first columnar body. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 06-108458 Summary of the Invention [Problem to be solved by the invention]

[0004] However, because the reinforcing bar cage is cylindrical, it is difficult to tell if the cage rotates around the vertical axis when it is dropped into the borehole, and if the cage is placed in the borehole with the plate displaced due to the cage rotating, the plate will be displaced from the designated position of the first columnar body. This makes it difficult to expose the plate when the surface of the retaining wall having the first columnar body is chipped, reducing the ease of work to expose the plate, which leads to increased costs and longer construction time.

[0005] In view of this situation, the main object of the present invention is to provide a wall joining method which can improve the ease of work in exposing the plates and effectively reduce costs and shorten construction time. [Means for solving the problem]

[0006] A first characteristic configuration of the present invention is a wall joining method for joining an earth retaining wall to a basement exterior wall by constructing an earth retaining wall with a plate embedded therein, excavating the ground on the basement exterior wall side of the earth retaining wall, chipping the surface of the earth retaining wall to expose the plate, attaching a connector to the exposed plate, and pouring concrete for the basement exterior wall so as to embed the connector, the method comprising the steps of: The retaining wall is a column wall in which first cylindrical bodies and second cylindrical bodies are alternately arranged, The first columnar body is a columnar body made of reinforced concrete with a cylindrical reinforcing bar cage embedded therein, In constructing the first pillars, an excavation step of excavating the ground between a pair of adjacent second columnar bodies while partially overlapping the second columnar bodies previously constructed in parallel at a set interval to form a cylindrical excavation hole; A reinforcing bar cage installation process in which the reinforcing bar cage having the plate attached to the underground outer wall side of the outer surface is dropped into the excavation hole using a rotation prevention means for preventing the rotation of the reinforcing bar cage; and a pouring process for pouring concrete into the borehole in which the reinforcing bar cage is installed.

[0007] According to this configuration, the plate is attached to the underground outer wall side of the outer surface of the cylindrical reinforcing bar cage arranged in the first columnar body, so that the plate can be exposed by chipping the underground outer wall side surface of the retaining wall having the first columnar body. Then, by using the rotation prevention means when dropping the cylindrical reinforcing bar cage into the borehole, the rotation of the reinforcing bar cage is prevented, and it is possible to prevent the position of the plate from being shifted due to the rotation of the reinforcing bar cage, so that the plate can be embedded in a predetermined position in the borehole. Therefore, it becomes easier to expose the plate when the surface of the retaining wall having the first columnar body is chipped, and the workability of the work of exposing the plate is improved, and it is possible to reduce costs and shorten the construction period.

[0008] The second characteristic configuration of the present invention is that a connecting rebar having a shape that follows the circumferential direction of the reinforcing bar cage is fixedly connected to the plate, and the plate is attached to the reinforcing bar cage by connecting the connecting rebar to multiple vertical bars of the reinforcing bar cage.

[0009] According to this configuration, by connecting the connecting rebars on the plate across multiple vertical bars of the rebar cage, the plate can be precisely attached to the rebar cage in an appropriate posture, making it easier to further expose the plate when the surface of the underground exterior wall side of the retaining wall is chipped.

[0010] A second characteristic configuration of the present invention is that the anti-rotation means comprises a plurality of guide bars connected to the reinforcing bar cage in a state extending upward from the reinforcing bar cage, and a rotation prevention jig that guides the plurality of guide bars along the extension direction while restricting movement of the guide bars in a direction perpendicular to the extension direction.

[0011] According to this configuration, when the reinforcing bar cage is dropped into the borehole, multiple guide reinforcing bars are guided along the extension direction by the anti-rotation jig, so that the reinforcing bar cage can be easily installed in the borehole while preventing the reinforcing bar cage from rotating. [Brief description of the drawings]

[0012] Correct the order of [Figure 1] Longitudinal side view of the retaining wall and underground exterior wall [Diagram 2] Plan of earth retaining wall and underground exterior wall [Diagram 3] A diagram showing the state in which the leading columns of the retaining wall have been constructed. [Figure 4] A diagram showing the state in which the trailing columnar body of the earth retaining wall has been constructed. [Diagram 5] A diagram showing the inside of the retaining wall after it has been chipped away [Figure 6] Side view of rebar cage [Figure 7] (a) AA cross-sectional view of the first rebar cage, (b) BB cross-sectional view of the second rebar cage, and (c) CC cross-sectional view of the connection between the first and second rebar cages. [Figure 8] Plan view of plate and connecting steel bar [Figure 9] Front view of plate and connecting steel bar [Figure 10] Side view of plate and connecting steel bar [Figure 11] FIG. 1 is an explanatory diagram illustrating a procedure for constructing a precursor columnar body. [Figure 12] An explanatory diagram explaining the procedure for constructing a trailing columnar body. [Figure 13] A diagram showing a rebar cage being suspended by a crane [Figure 14] A diagram showing how the guide rebar is guided by the anti-rotation jig. [Figure 15] Wall Joint Method Flowchart [Figure 16] Plan view of an earth retaining wall and an underground exterior wall in another embodiment DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] An embodiment of a wall joining method according to the present invention will be described with reference to the drawings. As shown in Figures 1 and 2, the wall joint construction method involves constructing a wall joint structure that joins an earth retaining wall 2 located on the outer periphery of the planned construction site with an underground exterior wall 4 (underground structure 6) of a new building located inside X1 (the construction area toward the center of the planned construction site) of the earth retaining wall 2. In this way, by joining the underground exterior wall 4 of the new building to the earth retaining wall 2 constructed mainly for construction purposes, the earth retaining wall 2 can be used as a wall pile for supporting the building. In this wall joint construction method, as shown in Figure 4, a retaining wall 2 is constructed in the ground G with a plate 1 embedded inside, and when the ground G in the construction area is excavated to construct the underground structure 6, as shown in Figure 5, the inside X1 (underground outer wall side) of the retaining wall 2 is chipped to expose the plate 1, and an inner connector 15 (corresponding to a connector) is attached to the exposed plate 1, and in that state concrete is poured at the construction site of the underground outer wall 4 so as to bury the inner connector 15, thereby constructing the wall joint structure.

[0014] First, the earth retaining wall 2 will be described. The direction in which the earth retaining wall 2 and the underground exterior wall 4 are lined up will be referred to as the inside-outside direction X, and the side in the inside-outside direction X where the underground exterior wall 4 exists relative to the earth retaining wall 2 will be referred to as the inside X1, and the opposite side will be referred to as the outside X2. Also, the direction perpendicular to the inside-outside direction X when viewed from the vertical direction Z (the direction in which the earth retaining wall 2 and the underground exterior wall 4 extend) will be referred to as the width direction Y.

[0015] In this embodiment, as shown in FIG. 2, the retaining wall 2 is constructed on the outside X2 of the construction area to support the ground G on the outside X2 of the construction area when the construction area on the central side of the planned construction site of the new building is excavated and the underground structure 6 of the new building is constructed in the construction area. The retaining wall 2 is a column wall in which cylindrical trailing columns 7 (first columns) and cylindrical leading columns 8 (second columns) are arranged alternately. The trailing columns 7 are reinforced concrete columns with cylindrical reinforcing bar cages 10 embedded inside, and the leading columns 8 are unreinforced columns without reinforcing bar cages 10 embedded inside.

[0016] We will now explain the reinforcing bar cage 10. In explaining the reinforcing bar cage 10 and the plate 1 attached to this reinforcing bar cage 10, we will define the directions based on the state in which it is installed inside the trailing columnar body 7 as shown in Figure 2.

[0017] As shown in Fig. 13, the reinforcing bar cage 10 is configured with a plurality of main reinforcements 11 (corresponding to vertical reinforcements) arranged along the vertical direction Z (axial direction of the reinforcing bar cage 10) and a plurality of annular hoop reinforcements 12. As shown in Fig. 7, the main reinforcements 11 are arranged on the inner side of the hoop reinforcements 12 at predetermined intervals in the circumferential direction of the reinforcing bar cage 10. The hoop reinforcements 12 are arranged at predetermined intervals in the vertical direction Z. Each of the hoop reinforcements 12 abuts against the plurality of main reinforcements 11 from the radial outside, and the reinforcing bar cage 10 is formed by connecting to the main reinforcements 11 at the abutment points. In this embodiment, the main reinforcements 11 are arranged as a set of two reinforcing bars arranged radially of the reinforcing bar cage 10 as shown in Figure 7, etc., but in the following description, the set of two main reinforcements 11 will be simply referred to as main reinforcements 11.

[0018] As shown in Figure 6, the reinforcing bar cage 10 is configured by connecting multiple reinforcing bar cage sections, namely, a first reinforcing bar cage section 10A (see Figure 7a) having a first main bar 11A and a second reinforcing bar cage section 10B (see Figure 7b) having a second main bar 11B, along the vertical direction Z. At the connection portion 10C where the first reinforcing bar cage portion 10A and the second reinforcing bar cage portion 10B are connected, as shown in Figure 7(c), the first main bar 11A of the first reinforcing bar cage portion 10A and the second main bar 11B of the second reinforcing bar cage portion 10B are connected by a lap joint in a state where they are lined up in the circumferential direction of the reinforcing bar cage 10.

[0019] The structure for attaching the plate 1 to the reinforcing bar cage 10 will be described. As shown in Figure 7, connecting rebars 14 shaped to follow the circumferential direction of the rebar cage 10 are fixedly connected to the plate 1, and the connecting rebars 14 are connected to multiple main reinforcements 11 of the rebar cage 10, thereby attaching the plate 1 to the rebar cage 10.

[0020] As shown in Fig. 7 and Fig. 8, the connection rebar 14 is made of a rebar bent so as to form a V-shape when viewed from the vertical direction Z, and the V-shape gives it a shape that follows the circumferential direction of the rebar cage 10 as shown in Fig. 7. The connection rebar 14 has a first connection part 14A along the width direction Y and a second connection part 14B that extends from this part diagonally outward X2, and as shown in Fig. 8, a plate 1 is fixedly connected to the surface of the first connection part 14A of the connection rebar 14 facing the outward X2. Two plates 1 are attached to the outer surface of the rebar cage 10 lined up in the width direction Y.

[0021] 7, the main reinforcements 11 of the reinforcing bar cage 10 are connected and fixed to both the first connection portion 14A and the second connection portion 14B of the connecting reinforcing bar 14. The positions and the number of the main reinforcements 11 are different in the first reinforcing bar cage part 10A (see FIG. 7a), the second reinforcing bar cage part 10B (see FIG. 7b), and the connecting portion 10C (see FIG. 7c), but since the connecting reinforcing bar 14 is shaped along the circumferential direction of the reinforcing bar cage 10, the main reinforcements 11 are connected and fixed in a state of abutting against at least one of the first connection portion 14A and the second connection portion 14B in all of these portions 10A, 10B, and 10C, and the attitude of the plate 1 relative to the reinforcing bar cage 10 is maintained over the entire length in the vertical direction.

[0022] As shown in Figures 9 and 10, the plate 1 is formed in an elongated shape along the vertical direction Z, and as shown in Figure 7, the plate 1 is attached to the reinforcing bar cage 10 with the thickness direction of the plate 1 aligned along the inner-outer direction X. 8 to 10, a first connection portion 14A of a connection reinforcing bar 14 is joined to a surface of the plate 1 facing the outer side X2. Also, as shown in Fig. 7, an outer connector 16 for joining the plate 1 to the retaining wall 2 is joined to a surface of the plate 1 facing the outer side X2. Various stud bolts such as headed studs and threaded studs can be used as the inner connector 15 and the outer connector 16. As shown in Fig. 2, this embodiment shows an example in which a threaded stud is used as the outer connector 16 and a headed stud is used as the inner connector 15.

[0023] Next, the wall joining method will be explained. As shown in Figure 15, the wall joining method involves performing a leading column construction process #1, which is a process for constructing a leading column 8, a following column construction process #2, which is a process for constructing a following column 7, and an underground exterior wall construction process #3, which is a process for constructing an underground exterior wall 4, in the order listed.

[0024] In the preceding columnar body construction process #1, as shown in Figure 11(a), the casing tube 23 is rotated and pushed into the ground, and then, as shown in Figure 11(b), soil and underground obstacles are removed from inside the casing tube 23 in the ground, and as shown in Figure 11(c), the casing tube 23 is pulled up from the ground while being filled with unhardened preceding hardenable material 24, thereby constructing a preceding columnar body 8 as shown in Figures 11(d) and 3.

[0025] As the leading hardenable material 24, one having a relatively low strength after hardening is used in order to facilitate the excavation work when constructing the trailing columnar body 7, as described later. Specifically, in addition to liquefied treated soil and concrete, other hardenable materials such as soil cement can be used as the leading hardenable material 24, and the strength after hardening can be appropriately adjusted by changing the type and composition of these hardenable materials.

[0026] In trailing columnar body construction process #2, as shown in Figure 12(a), the casing tube 23 is rotated and pushed into the ground, and then, as shown in Figure 12(b), soil and underground obstacles are removed from inside the casing tube 23 in the ground, as shown in Figure 12(c), a cylindrical rebar cage 10 with a plate 1 attached is inserted into the casing tube 23, as shown in Figure 12(c), and the casing tube 23 is pulled up from the ground while filling the casing tube 23 with trailing hardenable material 25 as shown in Figure 12(d), thereby constructing the trailing columnar body 7 as shown in Figure 12(e) and Figure 4.

[0027] As described above, by carrying out the leading column construction process #1, the ground G is excavated and the leading column 8, which is the second column, is constructed in the ground at a predetermined interval, as shown in Figure 3, and by carrying out the trailing column construction process #2, the ground G is excavated so as to partially overlap the leading column 8, and the trailing column 7, which is the first column, is constructed with a cylindrical reinforcing bar cage 10 embedded in the ground, as shown in Figure 4, thereby constructing the retaining wall 2 as a composite column wall in which the trailing column 7 and the leading column 8 are arranged alternately in a row.

[0028] In the trailing columnar body construction process #2, as shown in Fig. 15, when constructing the trailing columnar body 7, the following steps are performed: excavation process #21 in which the ground G between a pair of adjacent leading columns 8 is excavated while partially overlapping with the leading columnar body 8 that is constructed in parallel at a set interval, forming a cylindrical borehole 27; reinforcing bar cage installation process #22 in which the reinforcing bar cage 10 with the plate 1 attached to the inside X1 part of the outer surface is dropped into the borehole 27 using a rotation prevention means 18 that prevents the reinforcing bar cage 10 from rotating; and pouring process #23 in which concrete is poured into the borehole 27 in which the reinforcing bar cage 10 is installed. In this embodiment, the work of attaching the plate 1 to the reinforcing bar cage 10, such as joining the outer connector 16 to the plate 1 and attaching the plate 1 to the reinforcing bar cage 10, is performed in a factory or the like before the excavation process #21.

[0029] In the excavation step #21, first, as shown in FIG. 12(a), a casing tube 23 with a drilling bit at its tip is rotated and pushed into the ground by a full-circle rotary excavator 28. At this time, the ground G is excavated while partially overlapping with the preceding columnar body 8 previously constructed, so that the casing tube 23 is pressed into the ground G while scraping off parts of the preceding columnar body 8 adjacent to both sides. Next, as shown in FIG. 12(b), a hammer grab 31 attached to a crane 30 removes the hardened material scraped off from the preceding columnar body 8 together with the demolished material of the existing underground structure, underground obstacles such as existing piles, soil, etc. from inside the casing tube 23 in the ground. In this way, in the excavation step #21, excavation is performed by the so-called all-casing method to form a borehole 27.

[0030] In reinforcing bar cage installation process #22, as shown in Fig. 12(c), the cylindrical reinforcing bar cage 10 with the plate 1 attached is inserted into the casing tube 23. At this time, the reinforcing bar cage 10 is inserted using anti-rotation means 18 (see Figs. 13 and 14) so ​​that the reinforcing bar cage 10 is inserted into the casing tube 23 in a state where it is prevented from rotating around its axis along the vertical direction Z.

[0031] As shown in Fig. 13 and Fig. 14, the rotation prevention means 18 includes a plurality of guide reinforcing bars 19 connected to the reinforcing bar cage 10 in a state of extending upward from the reinforcing bar cage 10, and a rotation prevention jig 20 that guides the plurality of guide reinforcing bars 19 along the vertical direction Z while restricting movement in directions (inward / outward direction X and width direction Y) perpendicular to the vertical direction Z (extension direction of the guide reinforcing bars 19). Fig. 13 shows a state in which the guide reinforcing bars 19 are interposed between the crane 30 and the reinforcing bar cage 10. Fig. 14 shows a state in which the rotation prevention jig 20 is fixed to the upper end of a casing tube 23 used when constructing the trailing columnar body 7 on the ground G.

[0032] As shown in FIG. 13, a connecting plate 22 is joined to the lower end of the guide reinforcing bar 19, and the connecting plate 22 is joined to the main reinforcing bars 11 of the reinforcing bar cage 10. 14, the anti-rotation jig 20 is configured to guide the guide rebar 19 in the up-down direction Z, and is configured to be fixed to the upper end of the casing tube 23. The casing tube 23 is provided with markings (not shown) at locations corresponding to the positions in the circumferential direction where the plate 1 is to be installed, and the anti-rotation jig 20 is installed on the casing tube 23 in accordance with the positions of the markings.

[0033] The rotation prevention jig 20 is provided with an insertion portion 20A through which the guide reinforcing bar 19 is inserted. In this embodiment, the rotation prevention jig 20 is provided with an insertion portion 20A that is U-shaped when viewed in the vertical direction, and a plurality of rotation prevention jigs 20 are installed on the casing tube 23 so that the opening side of the insertion portion 20A faces the center side of the casing tube 23, and by restricting movement in the inner / outer direction X and the width direction Y, the movement of the guide reinforcing bar 19 inserted into the insertion portion 20A in the circumferential direction is prevented. Therefore, by moving the reinforcing bar cage 10 downward with the guide reinforcing bar 19 inserted into the insertion portion 20A of the rotation prevention jig 20, the reinforcing bar cage 10 can be moved while being prevented from rotating around the axis along the vertical direction Z.

[0034] In the casting process #23, as shown in Fig. 12(d), the unhardened subsequent hardenable material 25 is filled into the casing tube 23 through the tremie pipe 32 inserted into the casing tube 23. Note that concrete is used as the subsequent hardenable material 25. Then, by filling the casing tube 23 with the trailing hardenable material 25 while pulling the casing tube 23 out of the ground, a borehole 27 is formed in the ground and a trailing columnar body 7 is constructed in the borehole 27, as shown in Figure 12 (e).

[0035] In underground exterior wall construction process #3, the ground G in the construction area is excavated, and as shown in Fig. 5, the inside X1 portion of the earth retaining wall 2 is chipped so that the plate 1 is exposed, and the inner connector 15 is joined to the exposed plate 1, and concrete is poured into the additional portion 26 located between the chipped portions of the earth retaining wall 2 so that it is flush with the chipped portion. Thereafter, as shown in Fig. 2, concrete is poured to bury the inner connector 15, and the underground exterior wall 4 is constructed. Note that pouring of the concrete for the additional portion 26 and pouring of concrete for constructing the underground exterior wall 4 may be performed simultaneously.

[0036] As described above, in this wall joining method, when constructing a trailing columnar body 7, the following steps are carried out: excavation process #21 in which the ground G between a pair of adjacent leading columnar bodies 8 is excavated while partially overlapping with the preceding columnar body 8 constructed earlier to form a cylindrical borehole 27; reinforcing bar cage installation process #22 in which a reinforcing bar cage 10 having a plate 1 attached to the part of its outer surface facing the underground exterior wall 4 is dropped into the borehole 27 using anti-rotation means 18 to prevent the reinforcing bar cage 10 from rotating; and pouring process #23 in which concrete is poured into the borehole 27 in which the reinforcing bar cage 10 is installed. By carrying out these steps to construct the trailing columnar body 7, it becomes easier to expose the plate 1 when chipping away the surface of the underground exterior wall side of the retaining wall 2, making it easier to chip away the surface of the underground exterior wall side of the retaining wall 2.

[0037] [Another embodiment] Other embodiments of the present invention will be described below. Note that the configurations of the embodiments described below are not limited to being applied alone, but may also be applied in combination with the configurations of other embodiments.

[0038] (1) In the above embodiment, a beam as the underground skeleton 6 is not specified, but the beam may be joined to the underground exterior wall 4 with its end buried in the underground exterior wall 4. In that case, for example, as shown in FIG. 16 , a joining plate 37 is provided at the end of the outer side X2 of the steel frame 36 of the beam 35, and the joining plate 37 is joined to the trailing columnar body 7 constituting the earth retaining wall 2 using a post-installed anchor 38, so that the beam 35 is supported by the earth retaining wall 2. Then, by pouring concrete on the inner side X1 of the earth retaining wall 2 with the beam 35 supported by the earth retaining wall 2, the beam 35 can be joined to the underground exterior wall 4 with its end buried in the underground exterior wall 4.

[0039] (2) In the above embodiment, a configuration has been described as an example in which the plate 1 is attached to the reinforcing bar cage 10 by connecting the plate 1 to the multiple main reinforcements 11 using a U-shaped connecting reinforcing bar 14. However, the configuration for attaching the plate 1 to the reinforcing bar cage 10 may be changed as appropriate, for example, by connecting the plate 1 to the multiple main reinforcements 11 of the reinforcing bar cage 10 using a curved connecting reinforcing bar 14, or by connecting the plate 1 to one main reinforcement 11 using a connecting member such as a U-bolt.

[0040] (3) In the above embodiment, an example has been described in which the rotation prevention means 18 is configured to include a plurality of guide reinforcing bars 19 and the rotation prevention jig 20 that guides the guide reinforcing bars 19. However, the rotation prevention means 18 may be configured in any manner that prevents the reinforcing bar cage 10 from rotating when the reinforcing bar cage 10 is dropped into the drilling hole 27, and the configuration of the rotation prevention means 18 may be changed as appropriate, for example, to include a plurality of wires that suspend the reinforcing bar cage 10 and a jig that guides the wires.

[0041] (4) In the above embodiment, the work of attaching the plate 1 to the reinforcing bar cage 10 was performed in a factory or the like before excavation process #21, but the timing of the work of attaching the plate 1 to the reinforcing bar cage 10 may be changed as appropriate, and may be performed on site in parallel with excavation process #21 or after excavation process #21. [Explanation of symbols]

[0042] 1 Plate 2 Retaining wall 4 Underground outer wall 7 Posterior columnar body (1st columnar body) 8 Preceding column (second column) 10 Reinforced Concrete Cage 14 Connecting rebar 15 Inner zygote (zygote) 18 Anti-rotation means 19 Guide bar 20 Anti-rotation jig 27 Borehole X1 Inside (underground exterior wall side) #21 Excavation process #22 Reinforced concrete cage installation process #23 Pouring process

Claims

1. A wall joining method for joining an earth retaining wall to an underground exterior wall by constructing an earth retaining wall with a plate embedded therein, excavating the ground on the underground exterior wall side of the earth retaining wall, chipping the surface of the earth retaining wall to expose the plate, attaching a connector to the exposed plate, and pouring concrete for the underground exterior wall so as to embed the connector, comprising: the retaining wall is a column wall in which first cylindrical bodies and second cylindrical bodies are alternately arranged, The first columnar body is a columnar body made of reinforced concrete having a cylindrical reinforcing bar cage embedded therein, In constructing the first pillars, an excavation step of excavating the ground between a pair of adjacent second columnar bodies while partially overlapping the second columnar bodies previously constructed in parallel at a set interval to form a cylindrical excavation hole; A reinforcing bar cage installation process in which the reinforcing bar cage having the plate attached to the underground outer wall side of the outer surface is dropped into the excavation hole using a rotation prevention means for preventing the rotation of the reinforcing bar cage; A wall joining method comprising the steps of: pouring concrete into the borehole in which the reinforcing bar cage is installed;

2. A wall joining method as described in claim 1, in which a connecting reinforcing bar shaped to follow the circumferential direction of the reinforcing bar cage is fixedly connected to the plate, and the connecting reinforcing bar is connected to multiple vertical bars of the reinforcing bar cage, thereby attaching the plate to the reinforcing bar cage.

3. A wall joining method as described in claim 1 or 2, wherein the rotation prevention means comprises a plurality of guide bars connected to the reinforcing bar cage in a state extending upward from the reinforcing bar cage, and a rotation prevention jig that guides the plurality of guide bars along the extension direction while restricting movement of the guide bars in a direction perpendicular to the extension direction.

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