Method for removing concrete blocks

Abstract

This invention provides a method for reliably cutting and demolishing concrete blocks from existing concrete structures, even in confined spaces, and for efficiently, reliably, and safely removing the concrete blocks from the existing concrete structures. [Solution] A method for cutting out a concrete block from a concrete structure that extends longitudinally and has a cut-off upper end surface, and pulling out the cut-out concrete block from the concrete structure, characterized in that the bottom edge of the side surface of the concrete structure is made horizontal and cut to a predetermined thickness so as to connect to the cut-off upper end surface, a running member is inserted into the cut surface of the cut bottom edge, then the concrete block is cut downwards from the upper end surface on the rear side of the concrete structure to cut out a concrete block from the concrete structure, the concrete block is placed on the running member, and the concrete block placed on the running member is pulled out from the concrete structure.

Description

Technical Field

[0001] The present invention relates to a method for pulling (moving) a heavy concrete block cut out from a concrete structure to a predetermined position, for example, a forward position where the block can be hoisted by a crane. Background Art

[0002] Conventionally, in the demolition work of existing concrete in existing structures, the concrete constituting the existing concrete structure is cut into blocks, and a crane is used to transport the cut-out concrete blocks.

[0003] However, depending on the installation environment of the existing concrete structure, some concrete blocks must be cut out at locations unreachable by cranes, and such concrete blocks need to be pulled to a position where they can be hoisted by a crane. Conventionally, as a method for pulling a cut-out concrete block to a position where it can be hoisted by a crane, a chain block or the like is used in combination to move the block.

[0004] Here, as prior arts for moving a heavy object to a predetermined position, techniques are generally known, such as Japanese Patent Laid-Open No. 2011-105474 relating to a frame for transportation work, and Japanese Patent Laid-Open No. 11-336172 which uses an installation groove when transporting a box culvert. However, the method using a chain block requires chain block installation work, which complicates the work, and also requires securing a space for installing the chain block.

[0005] Furthermore, for example, the invention of Japanese Patent Laid-Open No. 2011-105474 relating to a frame for transportation work cannot be applied in a narrow environment where a frame cannot be installed. Furthermore, the invention of Japanese Patent Laid-Open No. 11-336172, which uses an installation groove when transporting a box culvert, also cannot be applied to concrete demolition work because there is no such installation groove available.

[0006] Therefore, in recent years, there has been a demand for technologies that can be applied to concrete cutting and demolition work even in confined environments, and that can efficiently extract concrete blocks. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Japanese Patent Publication No. 2011-105474 [Patent Document 2] Japanese Patent Application Publication No. 11-336172 [Overview of the project] [Problems that the invention aims to solve]

[0008] The present invention was devised to address the aforementioned conventional problems and needs, and aims to provide a method for extracting concrete blocks that can reliably perform the cutting and demolition of concrete blocks from existing concrete structures even in confined environments, and that can efficiently, reliably, and safely extract the concrete blocks from the existing concrete structure from which they were cut. [Means for solving the problem]

[0009] The present invention A method for cutting out a concrete block from a concrete structure that extends longitudinally and has an edge-cut upper end surface, and pulling out the cut-out concrete block from the concrete structure, The side of the concrete structure is cut with the base horizontal and continuous to the cut upper end surface, having a predetermined thickness. A running member is inserted into the cut surface of the base. Then, the concrete structure is cut downwards from the upper end surface at the rear side to create a concrete block cut out from the concrete structure. This concrete block is placed on the running member, and the concrete block placed on the running member is pulled out from the concrete structure. It is characterized by the following: or A method for cutting out a concrete block from a concrete structure that extends longitudinally and has an edge-cut upper end surface, and pulling out the cut-out concrete block from the concrete structure, The base of the side of the concrete structure is cut horizontally with a continuous core drill to a predetermined thickness, and the cut surface of the base, which was cut with a continuous core drill to a predetermined thickness, is made continuous with the cut surface to connect to the cut upper end surface, and the inside of the cut surface of the base is made into a running surface so that a running member can be inserted, and then the concrete block is cut downwards from the upper end surface on the rear side of the concrete structure to cut out a concrete block from the concrete structure, the concrete block is placed on the running member, and the concrete block placed on the running member is pulled out from the concrete structure. It is characterized by the following: or The aforementioned running member is configured to have wheel-shaped rollers or spherical rollers. It is characterized by the following: [Effects of the Invention]

[0010] The present invention provides a method for extracting concrete blocks that allows for the reliable extraction and demolition of concrete blocks from existing concrete structures even in confined spaces, enables efficient extraction from existing concrete structures, and allows for the reliable and smooth extraction of the extracted concrete blocks from the existing concrete structures. [Brief explanation of the drawing]

[0011] [Figure 1] This is an explanatory diagram illustrating the process of cutting a concrete structure into a roughly rectangular shape that reaches the upper end surface, which is cut off from the front side surface. [Figure 2] This is an explanatory diagram illustrating the setup of the temporary scaffolding placed in front of the cut concrete block. [Figure 3] This is a diagram illustrating an example of a running component. [Figure 4]It is an explanatory diagram (1) illustrating a state where a concrete block cut out from a concrete structure is pulled out forward. [Figure 5] It is an explanatory diagram (2) illustrating a state where a concrete block cut out from a concrete structure is pulled out forward. [Figure 6] It is an explanatory diagram (3) illustrating a state where a concrete block cut out from a concrete structure is pulled out forward. [Figure 7] It is an explanatory diagram (1) illustrating a state where the pulled-out concrete block is moved to a predetermined position. [Figure 8] It is an explanatory diagram (2) illustrating a state where the pulled-out concrete block is moved to a predetermined position. Mode for Carrying Out the Invention

[0012] Hereinafter, the present invention will be described based on embodiments shown in the drawings. The existing concrete structure 1 applied in the present embodiment shown in the drawings is an existing concrete structure 1 in which a water channel of a hydroelectric power plant is formed. However, the present invention is not limited to this concrete structure 1, and is applied to pulling out a concrete block 2 cut out from a concrete structure 1 whose upper end surface 6 is cut off (see FIGS. 4 to 8) and extends in a longitudinal direction such as a depth direction.

[0013] That is, the feature of the present invention is a method of cutting a heavy concrete block 2 from an existing concrete structure 1 that has a cut-off upper end surface 6 and extends in the depth-side longitudinal direction, and pulling the cut-out concrete block 2 out to, for example, an installation position of a lifting crane located forward.

[0014] First, in the existing concrete structure 1, the front side surface 3 is cut into a substantially square shape. In the present embodiment, a case is shown where cutting is performed into a substantially square shape, to be precise, into a substantially concave shape leaving the upper end surface 6 (see FIG. 1), but the cut shape is not limited to a square shape.

[0015] However, the bottom portion 4 to be cut needs to be cut horizontally. Also, as mentioned above, the upper end surface 6 of the existing concrete structure 1 has been cut off and does not need to be cut.

[0016] Therefore, when cutting into a rectangular shape, the cut is made in a substantially concave shape so as to reach the upper end surface 6 which is cut off at the edge. Furthermore, an important feature of this invention is that the cut portion 5 has a predetermined thickness.

[0017] To cut the section 5 to a predetermined thickness, one method is to attach a bit to a drill, use the bit drilling device to drill holes in the side surface 4 of the concrete structure 1, and then cut by connecting the drilled holes. This method is known as continuous core drilling or continuous core extraction. Continuous core extraction is performed horizontally or vertically so that the drilled holes are connected, thereby creating a section 5 with a constant cutting thickness. In this embodiment, because the core was extracted continuously, the cut end surface is wavy.

[0018] Furthermore, core drilling is not limited to the aforementioned bit drill; continuous core drilling may also be performed by wet drilling, i.e., water jet drilling. In addition, cutting does not have to be done by continuous core drilling as long as it can be cut to a predetermined thickness.

[0019] Figure 1 shows the state after continuous core drilling in a roughly concave shape from the existing concrete structure 1. In this state, the concrete block 2 has not yet separated from the concrete structure 1. This is because the far side has not yet been cut and is still connected to the existing concrete structure 1.

[0020] However, in this state, a running surface is formed that has a height such that the running member 7 fits into the horizontal cut portion 5 of the base portion 4, and the running member 7 is inserted into this running surface.

[0021] As will be described later, a concrete block 2, completely separated from the concrete structure 1, will be placed on the inserted running member 7, and the concrete block 2 on the running member 7 will be able to move easily, for example, forward. The separated concrete block 2 is heavy, and once separated from the concrete structure 1, it will fall due to its own weight and be placed on the running member 7. Therefore, it is preferable that the thickness of the cut be such that the running member 7 can be inserted. If the width of the cut is long, the impact of the fall due to its own weight will be high, and there is a risk that the running member 7 on which the block falls will be damaged.

[0022] The configuration of the running member 7 is not limited in any way. An example is shown in Figure 3, but it is not limited to this. The running member 7 shown in Figure 3 is constructed by attaching a plurality of wheel-shaped rollers 9 to the lower surface of the frame 8 that constitutes the running member 7, but for example, instead of a plurality of wheel-shaped rollers 9, a running member 7 that can move in any direction, not just one direction, may use spherical rollers 9.

[0023] The frame 8 has a base plate, a reinforcing plate extending vertically from the base plate, and a pivot support fixed to the reinforcing plate, and the roller 9 is rotatably supported on the pivot support.

[0024] Here, the running member 7 is inserted into the cut section 5 having a predetermined cutting thickness. When inserting, the roller 9 may be inserted with the roller 9 facing downwards, or it may be inserted with the roller 9 facing upwards.

[0025] When the roller 9 is inserted with the roller facing downwards, the separated concrete block 2 will rest on the support frame 8, and the running member 7 on which the concrete block 2 rests will be pulled forward to pull out the concrete block 2. When the roller 9 is inserted with the roller facing upwards, the running member 7 will act as a roller, and only the concrete block 2 will travel on the roller 9 and be pulled forward. Therefore, in this case, it is necessary to place another running member 7 with the roller 9 facing upwards in front.

[0026] However, after inserting the running member 7 into the horizontal cut section 5 of the base section 4, a cutting member such as a wire saw is used to cut the concrete block vertically, or in other words, perpendicularly, from the cut upper end surface 6 at the tip of the hole drilled by continuously core drilling in the longitudinal direction toward the rear. This cuts the concrete block 2, which has been cut in a roughly concave shape, away from the existing concrete structure 1. As a result of being separated, the concrete block 2 is placed on the running member 7 by its own weight.

[0027] Next, we will explain how to pull the concrete block 2, which is placed on the running member 7, forward. Figure 2 shows the temporary scaffolding 10. The temporary scaffolding 10 is positioned in front of where the concrete block 2 is pulled out. It is used to smoothly pull out the concrete block 2 without creating any steps. When the running member 7 is inserted with the roller 9 facing downwards, the temporary scaffolding 10 needs to have a rail section 11 with a roughly concave groove so that the running member 7 can move forward.

[0028] In the example shown in Figure 2, two rail sections 11 are formed with a gap between them in the width direction of the concrete block 2.

[0029] Furthermore, if the running member 7 is inserted with the roller 9 facing upwards, it is necessary to install the running member 7 with the roller 9 facing upwards on the temporary scaffolding 10 as well. Additionally, the running member 7 must be installed on the temporary scaffolding 10 such that the contact surface between the running member 7 and the roller 9 on which the concrete block 2 rests is approximately flush with the upper end surface of the roller 9 on the running member 7 installed on the temporary scaffolding 10. If there is a step between the contact surface between the running member 7 and the roller 9 on which the concrete block 2 rests and the space in front of the concrete block 2, it will hinder the pulling operation, especially if the running member 7 installed on the temporary scaffolding 10 is high.

[0030] Therefore, as mentioned above, when installing the temporary scaffolding 10 on which the running member 7 is placed, it is preferable to adjust it so as little difference in height as possible.

[0031] Although the temporary scaffolding 10 and the rail section 11 provided on the temporary scaffolding 10 are not essential components of the present invention, it is extremely important to eliminate any steps in the pulling direction and to stabilize the posture of the concrete block 2 during pulling, thereby making it safe, reliable, and efficient to pull out the heavy concrete block 2.

[0032] Figures 4 to 6 show the process of pulling out a heavy concrete block 2, which is placed on the traveling member 7, to a predetermined position, i.e., a position where it can be lifted by a crane. As can be seen from Figures 4 to 6, a pulling jig 12 is attached to the front side 3 of the cut concrete block 2, and by pulling these pulling jigs 12, the concrete block is pulled out from the concrete structure 1 to a position in front of it, for example, where a crane is located. After being pulled out to the predetermined position, it is then rigged with a crane (Figure 7) and lifted and moved to the predetermined position (see Figure 8). After moving the concrete block 2 to the designated location, the concrete will be further crushed at that location, and the crushed concrete will be loaded onto a vehicle and transported to an external location. [Explanation of symbols]

[0033] 1. Concrete structures 2 Concrete blocks 3 Sides 4. Base 5 Cut section 6 Top surface 7. Running Member 8 mounting bases 9 Laura 10 Temporary scaffolding 11 Rail section 12. Tension members

Claims

1. A method for cutting out a concrete block from a concrete structure that extends longitudinally and has an edge-cut upper end surface, and pulling out the cut-out concrete block from the concrete structure, The side of the concrete structure is cut with the base horizontal and continuous to the cut upper end surface, having a predetermined thickness. A running member is inserted into the cut surface of the base. Then, the concrete structure is cut downwards from the upper end surface at the rear side to create a concrete block cut out from the concrete structure. This concrete block is placed on the running member, and the concrete block placed on the running member is pulled out from the concrete structure. A method for extracting concrete blocks, characterized by the following features.

2. A method for cutting out a concrete block from a concrete structure that extends longitudinally and has an edge-cut upper end surface, and pulling out the cut-out concrete block from the concrete structure, The base of the side of the concrete structure is cut horizontally with a continuous core drill to a predetermined thickness, and the cut surface of the base, which was cut with a continuous core drill to a predetermined thickness, is made continuous with the cut surface to connect to the cut upper end surface, and the inside of the cut surface of the base is made into a running surface so that a running member can be inserted, and then the concrete block is cut downwards from the upper end surface on the rear side of the concrete structure to cut out a concrete block from the concrete structure, the concrete block is placed on the running member, and the concrete block placed on the running member is pulled out from the concrete structure. A method for extracting concrete blocks, characterized by the following features.

3. The aforementioned running member is configured to have wheel-shaped rollers or spherical rollers. The concrete block extraction method according to claim 1, characterized by its features.

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