How to lay concrete blocks

Abstract

To provide an installation method for a concrete block capable of installing a plurality of concrete blocks collectively even in a construction site in which slope surface length is short.SOLUTION: An installation method for concrete blocks 30 includes steps of: installing a bedding material 20 for suspension at a river side slope surface 10; placing a plurality of concrete blocks 30 on the bedding material 20 for suspension, and forming a plurality of block bodies 36 by connecting the concrete blocks 30 adjacent to each other with a connection tool; engaging a first suspension wire 70 on which a shackle 73 is mounted to the connection tool 34 and an H-steel 60; engaging a second suspension wire 74 to the bedding material 20 for suspension and the H-steel 60; integrally suspending the bedding material 20 for suspension and the plurality of block bodies 36 by suspending the H-steel 60 with a suspension and transport device 50 and installing these at a predetermined installation position; and separating the first suspension wire 70 and the second suspension wire 74 from the plurality of block bodies 36 and the H-steel 60.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a method for laying concrete blocks. [Background technology]

[0002] In revetment works to protect the shore slopes of rivers, lakes, and oceans from water erosion, there is a so-called revetment block work in which existing concrete blocks are laid along the slope. As an example of such revetment block work, the applicant has proposed a concrete block laying method as disclosed in Patent Document 1 (JP 2022-029969 A). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2022-029969 Summary of the Invention [Problem to be solved by the invention]

[0004] In the method disclosed in Patent Document 1, if the length of the slope at the concrete block installation position is insufficient, it may not be possible to line up multiple concrete blocks on the slope, and the construction method proposed in Patent Document 1 may not be applicable. [Means for solving the problem]

[0005] Therefore, an object of the present invention is to propose a method for laying concrete blocks that can be applied regardless of the length of the slope at the laying position of the concrete blocks (the width of the laying position).

[0006] That is, the present invention is a method for laying concrete blocks, comprising the steps of laying a lifting mat on the ground surface, arranging a plurality of the concrete blocks on the lifting mat and connecting adjacent concrete blocks with connectors to form a multi-block body, engaging a first end side first engaging body of each of a plurality of first lifting wires formed to the same length and having first engaging bodies attached to both ends with the connectors and engaging a second end side first engaging body with a lifting auxiliary body, and a step of engaging the attached second lifting wire with both ends of the lifting floor material and the lifting auxiliary body; a step of lifting the lifting auxiliary body with a lifting device to lift the lifting floor material and the multiple block bodies together and laying the lifting floor material and the multiple block bodies at a predetermined laying position; and a step of separating the first lifting wire from the multiple block bodies and the lifting auxiliary body and separating the second lifting wire from the lifting floor material and the lifting auxiliary body.

[0007] This makes it possible to lay multiple concrete blocks together regardless of the length of the slope at the laying position of the concrete blocks (the width of the laying position).

[0008] It is also preferable that the method further comprises the step of placing a wicking prevention sheet between the lifting floor material and the concrete blocks before placing the plurality of concrete blocks on the lifting floor material.

[0009] This makes it possible to interpose a suction prevention sheet between the slope at the concrete block installation position and the concrete block.

[0010] Furthermore, the step of disposing the wicking prevention sheet between the lifting mat and the concrete block is preferably a step of laying the wicking prevention sheet so that the end positions of the sheet extend beyond the planar area of ​​the plurality of blocks.

[0011] This allows multiple blocks to be laid repeatedly with the suction prevention sheets of adjacent blocks wrapped around each other, making it particularly suitable for laying concrete blocks in bank protection construction work.

[0012] Furthermore, the method further includes a step of attaching lifting sections to both ends of the lifting mat before engaging the second lifting wire with both ends of the lifting mat and the lifting auxiliary body, and a step of separating the lifting sections from the lifting mat after the lifting mat and the multiple block bodies are integrated and laid at the predetermined laying position, and it is preferable that the step of engaging the second lifting wire with both ends of the lifting mat and the lifting auxiliary body is a step of suspending the middle section of the second lifting wire over the lifting sections attached to both ends of the lifting mat and engaging the second engagement bodies at both ends of the second lifting wire with the lifting auxiliary body.

[0013] As a result, after the installation of the multiple block bodies is completed, at least one of the two ends of the lifting mat across which the second lifting wire is hung can be repeatedly used when lifting other multiple block bodies.

[0014] In addition, an L-shaped block fixing frame is arranged at both end positions of the multiple block bodies in the lifting floor material, and when arranging multiple concrete blocks on the lifting floor material, it is preferable to insert the first end edge of the block fixing frame into the underside of the concrete blocks at both end positions of the multiple block bodies.

[0015] This prevents the blocks from sliding down the slope due to gravity when they are laid on an inclined surface, resulting in misalignment of the installation position. It also improves stability when the lifting device lifts the lifting auxiliary body and the blocks, which is expected to prevent the load from collapsing during lifting.

[0016] Furthermore, the first engaging body on the first end side is a shackle, and a rope body is connected to the blocking pin in the shackle and the rope body is pulled out from the blocking pin by the required length, and when separating the first suspension wire from the multiple block bodies, it is preferable to pull in the rope body and pull out the blocking pin from the main body of the shackle.

[0017] This makes it easier to separate the first end-side first engaging body from the multiple block bodies, particularly when the installation location is the slope of a levee or when the multiple block bodies are partially submerged in water. [Effects of the Invention]

[0018] According to the configuration of the present invention, multiple concrete blocks can be laid together regardless of the length of the slope at the laying position (the width of the laying position), making it possible to significantly improve work efficiency. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a schematic process diagram of a concrete block laying method according to an embodiment of the present invention. [Figure 2] FIG. 2 is an explanatory view showing a first step in this embodiment. [Figure 3] FIG. 1 is a plan view of a lifting mat. [Figure 4] FIG. 4 is an explanatory view showing a second step in this embodiment. [Figure 5] FIG. 10 is an explanatory view showing a third step in this embodiment. [Figure 6] FIG. 10 is an explanatory view showing a fourth step in this embodiment. [Figure 7] FIG. 10 is an explanatory view showing a fifth step in this embodiment. [Figure 8] FIG. 10 is an explanatory view showing a sixth step in this embodiment. [Figure 9] FIG. 10 is an explanatory view showing a seventh step in this embodiment. [Figure 10] FIG. 10 is an explanatory view showing a seventh step following FIG. 9. [Figure 11] FIG. 11 is an explanatory view showing a seventh step following FIG. [Figure 12] FIG. 10 is an explanatory view showing an eighth step in this embodiment. [Figure 13] FIG. 13 is an explanatory view showing a part of the eighth step following FIG. [Figure 14] FIG. 14 is an explanatory view showing a part of the eighth step following FIG. 13. DETAILED DESCRIPTION OF THE INVENTION

[0020] The present invention will be described below based on an embodiment in which it is applied to laying concrete blocks on a riverside slope in river bank protection work. The scope of application of the present invention is not limited to river bank protection work, but can also be applied to laying concrete blocks to protect the ground surface.

[0021] Workers lay concrete blocks sequentially according to the schematic process diagram of the concrete block laying method shown in Figure 1. In the first step, as shown in Figure 2, workers lay lifting mats 20 over a required area on the ground surface (here, the top of the river bank) around the river-facing slope 10 of the river bank, which is the construction area (S-1). In this embodiment, four lifting mats 20 are laid continuously as shown in Figure 3, but the number of lifting mats 20 laid on the ground surface is not particularly limited. In Figure 3, the horizontal direction is the slope length direction, and the vertical direction is the river flow direction. In this embodiment, geotextiles, such as Tensor (registered trademark), which are synthetic resin lattices, are used as the lifting mats 20, but the lifting mats 20 are not limited to geotextiles.

[0022] Next, as a second step, the worker can lay a suction prevention sheet 22 on the top surface of the lifting mat 20 (S-2), as shown in Figure 4. When laying multiple suction prevention sheets 22 on the lifting mat 20, it is preferable to lay them so that the ends of adjacent suction prevention sheets 22 overlap by a required amount. Also, at both vertical and horizontal ends of the lifting mat 20, the ends of the suction prevention sheets 22 can be laid so that they protrude by a required amount. Furthermore, it is preferable to fasten the suction prevention sheets 22 to the lifting mat 20 using a binding material such as a cable tie or a fastener such as a hook-and-loop fastener (neither of which are shown).

[0023] Next, in the third step, workers arrange a plurality of concrete blocks 30 in a matrix on the anti-soiling sheet 22, as shown in Figure 5. Here, the concrete blocks 30 are arranged so that the area where the lifting flooring 20 is laid matches the area where the concrete blocks 30 are laid. Because connectors 32 are embedded in each corner of the concrete blocks 30, workers can connect adjacent concrete blocks 30 at the connectors 32 using connectors 34 (S-3). In this embodiment, C-shaped connecting hooks (see Figure 7(B)) are used as connectors 34, but connectors 34 are not limited to this form.

[0024] In this way, a plurality of concrete blocks 30 are connected in a matrix arrangement to form a multi-block body 36. In the present embodiment, the multi-block body 36 is formed by connecting only the connectors 32 in the area where four adjacent concrete blocks 30 are connected by connectors 34, but it is also possible to connect the connectors 32 located on the outer periphery of the multi-block body 36 with connectors 34. The end of the suction prevention sheet 22 extends beyond the outer periphery (flat area) of the multi-block body 36 by a required width.

[0025] Next, in the fourth step, as shown in FIG. 6, the worker can attach lifting units 24 to both ends of the lifting sheet 20 in the slope direction (S-4). The lifting units 24 in this embodiment can be formed from a geotextile, such as Tensor (registered trademark), similar to the lifting sheet 20. In this embodiment, a cylindrical section 25 is formed at one end of the lifting unit 24 in the slope direction. The end of the lifting unit 24 is bent toward the other end and folded back, and the cylindrical section 25 is secured to the main body with an insert 27, such as a tensor joiner. A shaft 26, such as a round steel pipe, is inserted into the interior space of the cylindrical section 25. In this embodiment, a pulling wire (not shown) is connected to the shaft 26 inserted into one of the cylindrical sections 25 (the one on the slope side) of the lifting units 24 attached to both ends of the lifting sheet 20. The end of the lifting part 24 opposite the cylindrical part 25 is connected to the lifting mat 20 by an insert 27 .

[0026] In this embodiment, block-fixing frames 28, typically L-shaped steel frames, are attached to both ends of the multiple block bodies 36 in the slope direction by U-shaped inserts 27. In this embodiment, the block-fixing frames 28 are L-shaped steel frames having L-shaped bodies 28A arranged at required intervals on the slope in a direction perpendicular to the slope length (the direction of the river flow) and wires 28B connecting the L-shaped bodies 28A. The block-fixing frames 28 are preferably attached to the lifting unit 24 with the end (first end) of the L-shaped bodies 28A parallel to the slope extending downward into the underside of the concrete block 30 at the end of the multiple block bodies 36. In this embodiment, the lifting mat 20, the anti-soiling sheet 22, the lifting unit 24, and the multiple block bodies 36 form a laying unit 40.

[0027] In this embodiment, the laying unit 40 is lifted via an H-beam 60, which serves as a lifting auxiliary body that is directly lifted by a lifting device 50, such as a crawler crane. In the fifth step, as shown in FIG. 7, an operator connects the connector 34 of the laying unit 40 (multiple block bodies 36) to the H-beam 60 using a first hoisting wire 70. (A) in FIG. 7 is an enlarged view of portion VII in FIG. 6, and (B) in FIG. 7 is a schematic perspective view viewed in the direction of arrow B in FIG. 7(A). Shackles 73 are attached to both ends of the first hoisting wire 70 as the first-end-side first engaging body and the second-end-side first engaging body (first engaging body). The operator engages the shackles 73 attached to both ends of the first hoisting wire 70 with the laying unit 40 (connector 34 of multiple block bodies 36) and the first hook 62 of the H-beam 60, respectively (S-5). In this embodiment, the first suspension wires 70 are all formed to have the same length.

[0028] The shackle 73 in this embodiment has a U-shaped main body 73A and a blocking pin 73B that blocks the opening of the main body 73A by inserting the blocking pins 73B through the openings of the main body 73A. In this embodiment, the blocking pins 73B of the shackles 73 serving as first end first engagement portions of each of the multiple first suspender wires 70 are connected to a single rope body 75. Here, the blocking pins 73B are sequentially connected along the length of the single rope body 75. However, a configuration in which the blocking pins 73B are connected to multiple rope bodies 75 connected to the respective blocking pins 73B may also be employed. Alternatively, a configuration in which branch bodies (not shown) branched from the single rope body 75 are connected to the respective blocking pins 73B may also be employed. The reason for connecting the rope bodies 75 to the blocking pins 73B of the shackles 73 serving as first end side first engagement portions of the first suspender wires 70 in this manner will be described later.

[0029] Next, in the sixth step, as shown in FIG. 8 , the worker suspends the middle portion of the second hoist wire 74 over the outer periphery of the shaft 26 inserted through the tubular portion 25, and engages the shackles 73, which are second engagement bodies attached to both ends of the second hoist wire 74, with the second hooks 64 of the H-beam 60 (S-6). The second hoist wire 74 is engaged with the second hooks 64 of the H-beam 60 at multiple locations spaced at required intervals along the length of the shaft 26 (the depth direction of the paper in FIG. 8 ). The length of the second hoist wire 74 is preferably approximately 1.7 times the length of the first hoist wire 70, but is not limited to this length. By performing the fifth and sixth steps, the installation unit 40 can be engaged with the H-beam 60 at required intervals along the longitudinal direction. Note that the H-beam 60 used in this embodiment is assembled into a lattice whose outline is rectangular when viewed from above.

[0030] Next, in the seventh step, as shown in Figures 9 to 11, the worker uses the lifting device 50 to lift the H-beam 60 and lay the laying unit 40 at the desired installation position (S-7). As previously explained, there is no significant difference between the length of the first hoisting wire 70 and half the length of the second hoisting wire 74, and since the laying unit 40 has the block fixing frame 28, it can be lifted in a generally flat position, allowing for stable transport and installation of the laying unit 40. When laying the laying unit 40 on an inclined surface as in this embodiment, the laying unit 40 is placed on the slope from the toe side. Gravity acts on the laying unit 40 placed on the river-side slope 10, but because the block fixing frame 28 is attached to the toe end of the laying unit 40, it does not shift and can maintain its original installation position. Note that in Figure 9 and subsequent figures, some components have been omitted for simplification.

[0031] Next, in the eighth step, as shown in FIG. 12 , the worker separates the first hoisting wire 70 from the multiple block bodies 36 and the H-beam 60, and separates the second hoisting wire 74 on the slope shoulder side from the lifting section 24 and the H-beam 60 (S-8). In this embodiment, the worker on the slope shoulder side holds the first end of the rope body 75, connects the closure pin 73B on the slope shoulder side to the midpoint in the longitudinal direction of the rope body 75, and connects the closure pin 73B (on the toe side) to the rope body 75 in the installation order toward the second end of the rope body 75. The worker can separate the shackle 73 of the first hoisting wire 70 from the installation unit 40 (multiple block bodies 36) by pulling up the rope body 75. This embodiment is advantageous in that it allows the first hoisting wire 70 to be safely separated from the installation unit 40 even if part of the installation unit 40 is submerged.

[0032] After the shackles 73 of all the first hoisting wires 70 have been detached from the connectors 34 of the multiple block bodies 36, the worker continues with part of step 8. As shown in FIG. 13 , the worker moves the H-beam 60 to the toe side using the lifting device 50, and then removes all of the first hoisting wires 70 from the H-beam 60 and completely detaches the second hoisting wires 74 on the toe side from the lifting unit 24. After this, as part of step 8, the worker lifts the H-beam 60 using the lifting device 50 and detaches the second hoisting wires 74 on the toe side from the toe side lifting unit 24 (shaft 26) as shown in FIG. 14 . The second hoisting wires 74 on the toe side can be left hanging from the H-beam 60, but as part of step 8, the worker can also move the H-beam 60 to the toe side using the lifting device 50 and detach the second hoisting wires 74 on the toe side from the H-beam 60 (not shown).

[0033] Next, in the ninth step, the worker removes the lifting part 24 from the slope side end of the lifting sheet 20 (S-9). The work of removing the lifting part 24 from the lifting sheet 20 can be done by reversing the procedure of attaching the lifting part 24 to the lifting sheet 20, so an explanation using drawings will be omitted.

[0034] Next, in the tenth step, the worker retrieves the shaft 26 inserted into the tubular portion 25 of the lifting section 24 on the slope toe side (S-10). Because the second lifting wire 74 is only hung along a portion of the outer circumferential surface of the shaft 26 (the lower half of the shaft 26), the worker can pull up the pulling wire (not shown) connected to the shaft 26 to pull out the shaft 26 inserted into the tubular portion 25. The order of the ninth and tenth steps can also be reversed.

[0035] Next, in step 11, the worker checks whether the previously laid installation unit 40 is the final installation position in the installation range (S-11). If it is the final installation position, the worker ends the work (END); if it is not the final installation position, the worker returns to step 1 and repeats steps 1 to 11. When laying the second or subsequent installation units 40, the installation units 40 are laid so that the siphon-off prevention sheets 22 that extend beyond the installation units 40 overlap, and the ends of adjacent installation units 40 can be connected using a known method.

[0036] According to this embodiment, the entire laying unit 40 is lifted and laid at the laying position, eliminating the need to construct the laying unit 40 on a slope. This allows multiple concrete blocks 30 to be laid simultaneously in a single lift, regardless of the length of the slope at the laying position (the width of the laying position). Furthermore, although the concrete blocks 30 located at both ends of the slope length direction are slightly bent upward when the laying unit 40 is lifted, the laying unit 40 can be lifted in a substantially flat state. This allows the laying unit 40 to be transported in a stable state and to be accurately positioned and laid at the desired laying position.

[0037] Furthermore, even if part of the laying unit 40 is laid underwater, the first lifting wire 70 and the shaft 26 can be reliably retrieved. In this embodiment, the multiple block bodies 36 are attached with a block fixing frame 28 between the underside of the concrete block 30 at the end position and the suction prevention sheet 22 (lifting floor material 20). This prevents the multiple block bodies 36 laid on the slope from sliding down due to the action of gravity and causing displacement of the laying position.

[0038] Although the present invention has been described above based on the present embodiment, the technical scope of the present invention is not limited to the above embodiment. For example, in this embodiment, the suction prevention sheet 22 is laid on the lifting mat 20, but the laying of the suction prevention sheet 22 can be omitted.

[0039] Furthermore, in this embodiment, the lifting units 24 are attached to both ends of the lifting sheet 20, and then the first hoisting wire 70 is engaged with the connectors 34 of the block bodies 36 and the first hooks 62 of the H-beam 60. However, this order is not required. The lifting units 24 can also be attached to both ends of the lifting sheet 20 after the first hoisting wire 70 is engaged with the connectors 34 of the block bodies 36 and the first hooks 62 of the H-beam 60. Furthermore, a configuration in which the lifting units 24 are omitted can be adopted. In this case, the second hoisting wire 74 can be appropriately hung (engaged) across the lattice portion of the lifting sheet 20. Alternatively, the second hoisting wire 74 can be configured identically to the first hoisting wire 70, and each end can be engaged with the lifting sheet 20, the lifting units 24, and the H-beam 60, as with the first hoisting wire 70.

[0040] Furthermore, in this embodiment, an example is given in which, after the laying unit 40 has been laid on the river-side slope 10, a worker pulls up one rope body 75 to separate the first hoisting wire 70 from the multiple block bodies 36 (laying unit 40), but this is not limited to this configuration. It is also possible to employ a configuration in which, after a portion of the laying unit 40 has been placed on the river-side slope 10, a worker sequentially pulls up the rope bodies 75 to sequentially separate the first hoisting wire 70 on the toe side of the slope from the first hoisting wire 70 on the toe side of the slope from the multiple block bodies 36. Even when multiple rope bodies 75 are used, the worker may pull up each rope body 75 together, or each rope body 75 can be pulled up individually.

[0041] Furthermore, although the present embodiment has described a method for laying concrete blocks 30 for revetment work on a slope of a levee, the present invention is not limited to this embodiment. As long as the concrete blocks 30 are laid, the laying work is not limited to a slope. The present invention is preferably applied to sites where it is not possible to secure space to construct the laying units 40 at the laying position, and of course the present invention can also be applied to sites where it is possible to construct the laying units 40 at the laying position.

[0042] Furthermore, the configuration of the present embodiment described above may be appropriately combined with modified examples described in the specification or other known configurations. [Explanation of symbols]

[0043] 10: River side slope 20: Lifting mat 22: Anti-absorption sheet 24: Lifting part, 25: Cylindrical part, 26: Shaft body, 27: Insertion material, 28: Block fixing frame, 28A: L-shaped body, 28B: Wire rod 30: Concrete block 32: Connector, 34: Connector, 36: Multiple blocks 40: Installation unit 50: Hanging equipment 60: H-beam (lifting support body) 62: 1st hook, 64: 2nd hook 70: First suspension wire 73: Shackle (first engagement body, first end side first engagement body, second end side first engagement body) 73A: Main body, 73B: Blocking pin 74: Second suspension wire 75: Rope body

Claims

1. A method for laying concrete blocks, comprising: laying a lifting bedding material on the ground surface; a step of placing a plurality of the concrete blocks on the lifting flooring and connecting adjacent concrete blocks with connectors to form a multi-block body; a step of engaging the first end side first engaging body of each of a plurality of first lifting wires, each having a first engaging body attached to both ends and formed to the same length, with the connecting tool and engaging the second end side first engaging body with the lifting auxiliary body; a step of engaging a second lifting wire, each having a second engaging body attached to each end thereof, with both ends of the lifting bedding and the auxiliary lifting body; a step of lifting the lifting auxiliary body with a lifting device to lift the lifting mat and the multiple block bodies together and laying the lifting mat and the multiple block bodies at a predetermined laying position; Separating the first lifting wire from the multiple block bodies and the lifting auxiliary body and separating the second lifting wire from the lifting mat and the lifting auxiliary body; A method for laying concrete blocks, comprising:

2. 2. The method for laying concrete blocks according to claim 1, further comprising the step of placing a suction-preventing sheet between the lifting material and the concrete blocks before placing the plurality of concrete blocks on the lifting material.

3. 3. The method for laying concrete blocks according to claim 2, wherein the step of placing the anti-soiling sheet between the lifting material and the concrete blocks is a step of laying the anti-soiling sheet so that the end positions of the sheet extend beyond the planar area of ​​the plurality of blocks.

4. attaching lifting parts to both ends of the lifting mat before engaging the second lifting wires with both ends of the lifting mat and the lifting aids; The method further includes a step of separating the lifting portion from the lifting mat after the lifting mat and the plurality of blocks are integrally laid at the predetermined laying position, A method for laying concrete blocks as described in any one of claims 1 to 3, characterized in that the process of engaging the second lifting wire with both ends of the lifting floor material and the lifting auxiliary body is a process of hanging the middle part of the second lifting wire over the lifting parts attached to both ends of the lifting floor material and engaging the second engaging bodies at both ends of the second lifting wire with the lifting auxiliary body.

5. L-shaped block fixing frames are provided at both end positions of the plurality of blocks in the lifting flooring material, The method for laying concrete blocks according to any one of claims 1 to 3, characterized in that when arranging the plurality of concrete blocks on the lifting flooring material, the first end edge of the block fixing frame is inserted into the underside of the concrete blocks at both ends of the plurality of block bodies.

6. L-shaped block fixing frames are provided at both end positions of the plurality of blocks in the lifting flooring material, The method for laying concrete blocks according to claim 4, characterized in that when placing the plurality of concrete blocks on the lifting flooring, the first end edge of the block fixing frame is inserted into the underside of the concrete blocks at both ends of the plurality of block bodies.

7. The first end side first engagement body is a shackle, A rope body is connected to the blocking pin of the shackle, and the rope body is pulled out by a required length from the blocking pin, A method for laying concrete blocks according to any one of claims 1 to 3, characterized in that when separating the first suspension wire from the multiple block bodies, the rope body is pulled in and the blocking pin is pulled out from the main body of the shackle.

8. The first end side first engagement body is a shackle, A rope body is connected to the blocking pin of the shackle, and the rope body is pulled out by a required length from the blocking pin, 5. A method for laying concrete blocks according to claim 4, wherein when separating the first suspension wire from the multiple block bodies, the rope body is pulled in and the blocking pin is pulled out from the main body of the shackle.

9. The first end side first engagement body is a shackle, A rope body is connected to the blocking pin of the shackle, and the rope body is pulled out by a required length from the blocking pin, A method for laying concrete blocks according to claim 5, characterized in that, when separating the first suspension wire from the multiple block bodies, the rope body is pulled in and the blocking pin is pulled out from the main body of the shackle.

10. The first end side first engagement body is a shackle, A rope body is connected to the blocking pin of the shackle, and the rope body is pulled out by a required length from the blocking pin, 7. A method for laying concrete blocks according to claim 6, wherein when separating the first suspension wire from the plurality of block bodies, the rope body is pulled in and the blocking pin is pulled out from the main body of the shackle.

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