Wall demolition method

Abstract

The present invention provides a wall chipping method that allows for the easy and appropriate removal of finishing materials, including mortar, from the surface of a concrete structure. [Solution] The method comprises an initial groove formation step in which a reference groove 24A is formed in the finishing material 23, and a primary groove 24B is formed parallel to the reference groove 24A while maintaining a predetermined pitch interval D; an initial gouging and destruction step in which a crowbar-shaped tool 30 is inserted into the primary groove 24B and gouged out to gouge out a strip-shaped pitch region 25; a subsequent groove formation step in which a secondary groove 24C is formed parallel to one end A of the strip-shaped pitch region 25 while maintaining a pitch interval D; and a repeating step in which a crowbar-shaped tool 30 is inserted into the secondary groove 24C and gouged out to gouge out a secondary strip-shaped pitch region 25A.

Description

Technical Field

[0001] The present invention relates to a chiseling method for a wall body that chisels a finishing material, which is applied to a wall body with a finishing material containing mortar constructed on the surface of a concrete body.

Background Art

[0002] Conventionally, as this type of chiseling method, there are known a mortar peeling method (see Patent Document 1) that uses a concrete cutter to cut and separate the mortar laminated on the surface of a concrete body, and a mortar peeling method (see Patent Document 2) that uses a mortar peeling device to peel the mortar constructed on the surface of a concrete body. The concrete cutter used in the former mortar peeling method is a disc-shaped cutter configured by brazing cemented carbide cutting segments on the periphery of a cutter substrate having a fitting hole for attachment at the center, and is used by being fitted and fixed to the rotating head of a driving device. The rotating head is provided with a wedge-shaped chip piece for cutting off the mortar thin pieces cut by the concrete cutter. In this mortar peeling method, in order to move the concrete cutter parallel to the surface of the concrete body, a pair of rail gantries equipped with a driving device are fixed to the concrete body using anchor bolts, and a rack gear shape and a pinion gear for moving the driving device along the rail gantry are provided. The concrete cutter is moved via the driving device to cut the mortar laminated on the surface of the concrete body in a slice shape, and at the same time, the mortar thin pieces are cut off. The mortar removal device used in the latter mortar removal method comprises a guide member fixed to the concrete structure via anchors, a hydraulic jack detachably attached to the guide member, and a cutter for removing mortar attached to the hydraulic jack. The guide member, which extends in one direction, is fixed to the concrete structure by multiple fixing means so as to be spaced away from the surface of the mortar. The hydraulic jack consists of a hydraulic cylinder and a piston rod, and the hydraulic cylinder portion is attached to the guide member. A cutter for removing mortar from the concrete structure is attached to the tip of the piston rod. A pair of guide grooves equal to the width of the cutter are formed in the mortar, and some of the mortar between the guide grooves is chipped away to form a cutter installation area. Then, the guide member is fixed and the hydraulic jack is set based on these guide grooves and cutter installation area. Once the preparation is complete, the piston rod is advanced and the mortar is removed by the cutter. After removing the mortar corresponding to the stroke of the piston rod, the piston rod is retracted and the hydraulic jack is moved to and from the guide member. The mortar removal process is carried out by repeating this peeling motion and the movement of the hydraulic jack. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2001-81975 [Patent Document 2] Japanese Patent Publication No. 2013-119708 [Overview of the project] [Problems that the invention aims to solve]

[0004] Conventional mortar removal methods all require large-scale equipment, resulting in high costs and making them unsuitable for small-scale projects such as partial tile replacement. Furthermore, the peeling device had to be frequently fixed (reattached) to the concrete structure, which resulted in a time-consuming construction process overall.

[0005] The present invention aims to provide a wall chipping method that allows for the easy and appropriate removal of finishing materials, including mortar, from the surface of a concrete structure. [Means for solving the problem]

[0006] The present invention relates to a wall chipping method, which involves chipping away the finishing material in a region of a wall to be chipped, where a finishing material containing mortar has been applied to the surface of a concrete structure. The method comprises: an initial groove formation step of forming a linearly extending reference groove in the finishing material, and forming a primary groove parallel to the reference groove with a predetermined pitch interval; an initial gouging and destruction step of inserting a crowbar-shaped tool into the primary groove and gouging to gouge out a strip-shaped pitch region between the reference groove and the primary groove; a subsequent groove formation step of forming a secondary groove parallel to one end of the strip-shaped pitch region in the finishing material with a pitch interval; and a repeating step of inserting a crowbar-shaped tool into the secondary groove and gouging out a secondary strip-shaped pitch region formed by the secondary groove.

[0007] With this configuration, a crowbar-like tool is inserted into the primary groove to gouge it out, removing the strip-shaped pitch area between the reference groove and the primary groove. This allows for easy destruction and removal of the strip-shaped pitch area in the early stages of the work process. Subsequently, the crowbar-like tool is inserted into the secondary groove, which replaces the primary groove, to gouge out the secondary strip-shaped pitch area formed by the secondary groove. By repeatedly forming, destroying, and removing the secondary strip-shaped pitch area, the finishing material in the desired area can be easily and appropriately chipped away from the surface of the concrete structure. Furthermore, noise generation can be minimized compared to chipping away the finishing material with a hammer drill or the like.

[0008] In this case, it is preferable that the reference groove, primary groove, and secondary groove each extend horizontally, and that the initial groove formation process, initial gouging and fracture process, and repeating process are carried out from top to bottom.

[0009] This configuration allows for the smooth and efficient destruction and removal of the strip-shaped pitch region and the secondary strip-shaped pitch region.

[0010] Furthermore, it is preferable that the width of the gouging tip of the crowbar-shaped tool inserted into the secondary groove is 40 to 50 mm, and that the strip-shaped pitch region and the secondary strip-shaped pitch region are each gouged out in multiple steps.

[0011] This configuration allows for efficient destruction and removal of the strip-shaped pitch area and the secondary strip-shaped pitch area by manual labor.

[0012] On the other hand, it is preferable that the reference groove, primary groove, and secondary groove each reach the concrete structure.

[0013] In this case, it is preferable that the depth of the cuts into the concrete structure by the reference groove, primary groove, and secondary groove are each the same as the pitch interval.

[0014] With these configurations, the surface of the concrete structure after the strip-shaped pitch area and secondary strip-shaped pitch area are destroyed and becomes roughened. Therefore, there is no need to adjust the surface of the concrete structure again when replacing (replacing) finishing materials.

[0015] Furthermore, a pitch spacing of 10 to 15 mm is preferable.

[0016] This configuration allows for the destruction and removal of the strip-shaped pitch area and secondary strip-shaped pitch area to be carried out manually, without difficulty and efficiently.

[0017] Furthermore, it is preferable to form end grooves at both ends of the area requiring chipping that is perpendicular to the reference groove.

[0018] Incidentally, when forming the reference groove, primary groove, and secondary groove using a disc-shaped cutter, the cutting depth may be insufficient at the beginning and end of the cut. If the cutting depth is insufficient, the subsequent strip-shaped pitch region may not be properly gouged out. With this configuration, by forming end grooves, it is possible to compensate for insufficient cutting depth at the beginning and end of each groove, and to ensure proper gouging and fracture of the strip-shaped pitch region.

[0019] Furthermore, it is preferable to form perforated grooves consisting of multiple perforations connected together at both ends of the area to be chipped, which is perpendicular to the reference groove.

[0020] This configuration allows for the formation of perforated grooves, which eliminates insufficient cutting depth at the beginning and end of each groove, and enables proper gouging and fracture of the strip-shaped pitch region.

[0021] Another wall chipping method of the present invention is a wall chipping method for chipping away finishing materials made of mortar and tiles attached to the surface of a concrete structure wall, in which the finishing materials are chipped away in the area to be chipped, and is characterized by comprising: a groove forming step of forming vertical grooves and horizontal grooves of a depth that cuts into the concrete structure relative to the joints so as to surround all the tiles in the area to be chipped; and a gouging and destruction step of inserting a crowbar-like tool into the horizontal grooves and gouging to gouge out all the tiles one by one.

[0022] According to this configuration, by inserting a bar-shaped tool into the cross-cut groove and prying it, the finishing material for one tile can be easily broken and removed from the surface of the concrete structure. By repeating this, the finishing material (multiple tiles) within the required chiseling area can be easily and appropriately chiseled off from the surface of the concrete structure. Also in this case, compared to the case of chiseling off the finishing material with a hammer drill or the like, the generation of noise can be suppressed to the greatest extent possible. In this case, it is preferable that the wall body is a tiled wall with small tiles (such as "New Narrow Mouth" or "50 Thirds").

[0023] In this case, it is preferable to form a perforation groove formed by connecting a plurality of perforation parts instead of the vertical cut groove.

[0024] According to this configuration, by forming the perforation groove, it is possible to eliminate the insufficient cutting depth at the start and end portions of each cut groove. In particular, in the case of tiling with a stagger joint, by forming a perforation groove instead of a vertical cut groove, it is possible to perform prying and breaking with good workability.

Brief Explanation of Drawings

[0025] [Figure 1] It is an external perspective view of the cutting device used in the chiseling method of this embodiment. [Figure 2] It is an external perspective view of the bar-shaped tool used in the chiseling method of this embodiment. [Figure 3] It is an explanatory diagram (a) regarding cut groove formation and an explanatory diagram (b) regarding prying and breaking in the chiseling method. [Figure 4] It is a front view of the wall body representing the required chiseling area. [Figure 5] It is a front view of the wall body representing the initial cut groove formation process. [Figure 6] It is a front view of the wall body representing the initial prying and breaking process. [Figure 7] It is a front view of the wall body representing the subsequent cut groove formation process. [Figure 8] It is a front view of the wall body representing the subsequent prying and breaking process. [Figure 9]This is a front view of the wall structure at the final stage of the construction process. [Figure 10] These are cross-sectional views of the wall (a) showing the area requiring chipping, (b) showing the initial groove formation process, and (c) showing the initial gouging and fracture process. [Figure 11] These are cross-sectional views of the wall (d) showing the continuous groove formation process, (e) showing the continuous gouging and destruction process, and (f) showing the wall at the final stage of the construction method. [Figure 12] This is a front view of a wall showing the area to be chipped away by the chipping method according to the second embodiment. [Figure 13] This is a front view of a wall showing the initial gouging and destruction process of the chipping method according to the second embodiment. [Figure 14] This is a front view of a wall showing the continuous gouging and demolition process of the chipping method according to the second embodiment. [Figure 15] This is a front view of the wall in the final stage of the chipping method according to the second embodiment. [Figure 16] This is an explanatory diagram of the chipping method according to the third embodiment, showing a front view (a) of the wall containing the tiles to be chipped, a cross-sectional view (b) of the wall in the chipped state, and a side view (c) of the prying jig. [Figure 17] This is a front view of a wall body showing the area to be chipped away using the chipping method according to the fourth embodiment. [Figure 18] This is a front view of a wall body showing the groove formation process of the chipping method according to the fourth embodiment. [Figure 19] This is a front view of a wall showing the gouging and destruction process of the chipping method according to the fourth embodiment. [Modes for carrying out the invention]

[0026] The following describes a wall chipping method according to one embodiment of the present invention, with reference to the attached drawings. In existing exterior walls (walls) with tile cladding, tiles are partially replaced when they are damaged. The chipping method of this embodiment efficiently chips away the tiles and mortar (finishing material) from the concrete structure in the area to be replaced (area requiring chipping).

[0027] This chipping method uses a cutting device 10 (see Figure 1), which is a disc grinder modified for wet use, and a crowbar-shaped tool 30 (see Figure 2), which is similar to a so-called rebar gathering crowbar. The following describes the cutting device 10 and the crowbar-shaped tool 30, followed by a description of the chipping method.

[0028] [Cutting device] Figure 1 is an external perspective view of the cutting device 10. As shown in the figure, the cutting device 10 has the basic form of a so-called disc grinder, with an exposed drive shaft 12 for mounting the disc 11, and comprises a motor 13 having a drive shaft 12, a device body 14 housing the motor 13, a mounting unit 15 for mounting the disc 11 on the drive shaft 12 and having a supply port for supplying coolant to the disc 11, and a disc cover 16 covering the disc 11.

[0029] The disc 11 is a so-called diamond wheel and has a mounting hole 11a in the center and comprises a blade substrate 11b formed by bonding two thin plate-shaped substrates, a plurality of segment chips 11c brazed to the outer edge of the blade substrate 11b, and a plurality of coolant flow channels 11d formed radially inside the blade substrate 11b. The coolant flows from the mounting hole 11a side to each coolant flow channel 11d via the mounting unit 15 and flows to the segment chips 11c, which are grinding blades, to cool them.

[0030] The disc cover 16 comprises a cover body 16a that covers the disc 11 and forms a shielding space, an outer cover 16b that covers the periphery of the open end side of the cover body 16a and forms a suction space between it and the cover body 16a, and a suction joint portion 16c attached to the outer cover 16b. The disc cover 16 has the function of covering the disc 11 to prevent unnecessary splashing of coolant, and also has the function of sucking up and recovering coolant waste liquid containing chips.

[0031] The device body 14, which houses the motor 13, is cylindrical in shape as a handheld power tool, and the drive shaft 12 is positioned to protrude from the center of a disc mounting base (not shown) located at the tip. A power cord 17 is connected to the base end of the device body 14. A coolant supply device (not shown) is connected to the mounting unit 15 via a coolant supply tube 18, and a coolant recovery device (not shown) is connected to the disc cover 16 via a waste coolant tube 19. The power cord 17, coolant supply tube 18, and waste coolant tube 19 are bundled together.

[0032] The cutting device 10 cuts concrete and the like by grinding it with a rotating disc 11 (diamond wheel). In the chipping method of this embodiment, a straight groove (cut groove 24) is formed on the surface of a wall 21 to which tiles 23b are attached via mortar 23a to a concrete structure 22. Although not shown in Figure 1, marks indicating the position of the disc 11 are provided on the front and back of the disc cover 16, and the straight groove 24 is formed by cutting while aligning these marks with the marking lines (details will be described later).

[0033] As shown in Figure 3(a), this cutting device 10 cuts the finishing material 23, which consists of tiles 23b and mortar 23a, to form straight grooves 24 that reach the concrete structure 22. Multiple grooves 24 are ultimately formed in a stripe pattern (see Figure 8), and it is preferable that the pitch spacing D between the grooves 24 is 10 to 15 mm. In other words, this pitch spacing D becomes the strip-shaped pitch area 25, which is the unit area of ​​gouging and destruction by the crowbar-shaped tool 30, so it is preferable for this width to be 10 to 15 mm in terms of workability.

[0034] However, depending on the site, the pitch spacing D may be wider than the above dimensions. For example, in a wall 21 where the adhesive strength of the mortar 23a, such as a tile wall where delamination has occurred, is judged to be weak, it is possible to make the pitch spacing D sufficiently wide.

[0035] Furthermore, it is preferable that the depth of the cuts into the concrete structure 22 be approximately the same as the width dimension (pitch interval D: 10-15 mm) of the strip-shaped pitch region 25. As will be described in detail later, by forming the cutting grooves 24 so as to cut into the concrete structure 22, the surface of the concrete structure 22 is intentionally damaged in a way that causes peeling during the subsequent gouging failure of the strip-shaped pitch region 25, resulting in a roughened surface. The thickness of the disc 11 in this embodiment is 3.5 mm, and naturally the groove width of the cutting grooves 22 is also 3.5 mm.

[0036] The formation of grooves 24 and the gouging and destruction of the strip-shaped pitch region 25 by the disc 11 do not generate noise problems like those associated with crushing and chipping using a hammer drill. Furthermore, the recovery system provided by the disc cover 16 eliminates dust problems and makes it possible to use the wall 21 even if it contains asbestos.

[0037] [Crowbar-shaped tool] Figure 2 is an external perspective view of the crowbar-shaped tool 30. As shown in the figure, the crowbar-shaped tool 30 comprises a spatula-shaped, curved tip section 31, a shaft section 32 extending from the tip section 31, and a non-slip grip section 33 connected to the end of the shaft section 32. The grip section 33 is the part that the operator grips and constitutes the point of force application. The shaft section 32 is the part that transmits the gouging force from the grip section 33 to the tip section 31. The tip section 31 is inserted into the groove 24, and its tip side constitutes the point of action that gouges out the strip-shaped pitch region 25. The base end of the tip section 31 abuts against the end wall created by the groove 24 and constitutes the fulcrum for the gouging motion.

[0038] As shown in Figure 3(b), the tip of this crowbar-shaped tool 30 is deeply inserted into the groove 24 formed by the cutting device 10. In this state, the grip portion 33 is pulled down to gouge out the strip-shaped pitch region 25. The tip of the crowbar-shaped tool 31 has a width of 40 to 50 mm, and if the length of the strip-shaped pitch region 25 is 2 m, for example, the entire strip-shaped pitch region 25 will be gouged out and destroyed with 4 to 5 gouging motions while moving laterally.

[0039] Furthermore, as described above, the groove 24 is cut deeply enough to reach the concrete structure 22, and when the tip gouge 31 gouges the strip-shaped pitch area 25, not only the finishing material 23, which consists of tiles 23b and mortar 23a, but also the surface of the concrete structure 22 is gouged and destroyed. In this case, the surface of the concrete structure 22 that is gouged and destroyed is destroyed to a moderate depth (about 10 mm) without reaching the reinforcing bars (which are about 30 mm deep), resulting in a so-called "roughened" state. Therefore, in the subsequent tile replacement process, the roughening work on the surface of the concrete structure 22 prior to the application of mortar 23a can be omitted.

[0040] For example, if "lifting" occurs between the surface of the concrete structure 22 and the mortar 23a, this is also considered lifting of the tile 23b and is subject to replacement. However, if the surface of the structure is not properly roughened at that time, lifting will occur again. In this embodiment, the surface of the concrete structure 22 is also roughened by the gouging process, so problems such as lifting occurring again do not occur.

[0041] [Demolition Method] As an example of the chipping method for the wall 21 of this embodiment, we will explain the case in which tiles 23b are partially replaced on a tiled exterior wall (wall 21). The replacement of tiles 23b is due to cracks, lifting, chipping, or peeling of the tiles 23b. In this embodiment, the tiles 23b and mortar 23a (finishing material 23) are chipped away from the surface of the concrete structure 22 in an area of ​​six tiles where cracks P have occurred (area requiring chipping 26) (see Figures 4 and 10(a)). Note that the tile work in this case is a so-called continuous joint, and staggered joints will be described later.

[0042] In this embodiment, the tiles 23b in the wall 21 are attached by direct bonding (direct pressure bonding) (see Figure 3). That is, the tiles 23b are attached to the surface of the concrete structure 22 via bonding mortar 23a, and the finishing material 23 consisting of this mortar 23a and tiles 23b is chipped away. However, in this embodiment, the surface of the concrete structure 22 is also chipped away shallowly in order to completely remove the mortar 23a and tiles 23b (see Figure 3).

[0043] Furthermore, this chipping method can be applied to wall structures 21 where the finishing material 23 consists of a base mortar, adhesive mortar 23a and tiles 23b, or to wall structures 21 where the finishing material 23 is simply mortar 23a. In addition, the cutting device 10 and crowbar-shaped tool 30 used in this chipping method may be commercially available disc grinders or rebar-gathering crowbars.

[0044] The demolition method for wall 21 consists of an initial work process and a repeating work process (repeated process). The initial work process is started on the upper end of the area to be demolded 26, and then the repeating work process is carried out from the upper end downwards. However, depending on the site, it is also possible to carry out the work from the lower end of the area to be demolded 26 upwards.

[0045] The initial work process includes an initial groove formation step (see Figures 5 and 10(b)) for forming the groove 24, and an initial gouging and fracture step (see Figures 6 and 10(c)) for gouging out the strip-shaped pitch region 25.

[0046] The repeated work process consists of a continuation groove formation process (see Figures 7 and 11(d)) in which grooves 24 parallel to the edge A of the gouged-out portion while maintaining the pitch spacing D, and a continuation gouging and destruction process (see Figures 8 and 11(e)) in which the new strip-shaped pitch region 25 formed by these grooves 24 is gouged out. These processes are repeated until the gouging of the area to be gouged 26 is completed (see Figures 9 and 11(f)).

[0047] In the initial groove formation process, a linearly extending reference groove 24A is formed in the finishing material 23, and a primary groove 24B parallel to the reference groove 24A is formed with a predetermined pitch interval D (10-15 mm) (see Figures 5 and 10(b)). Although not shown in the illustration, marking lines indicating the position of the grooves 24 are drawn throughout the entire area to be chipped 26, and the two uppermost grooves 24A and 24B are formed first according to these marking lines.

[0048] Specifically, a reference groove 24A is formed in the joint at the upper end of the area requiring chipping 26, and a primary groove 24B is formed at a position 1 pitch interval D below the reference groove 24A. By forming the reference groove 24A and the primary groove 24B, a band-shaped pitch area 25 is formed between the two grooves 24A and 24B.

[0049] Furthermore, when forming the groove 24 with the disc 11 (diamond wheel), the cut is in an arc shape, resulting in shallow cuts at the beginning and end of the cut. For this reason, it is preferable to form end grooves 27 in the vertical joints located at the left and right ends of the area requiring chipping 26 during this initial groove formation process. Also, when forming the groove 24 in the joint, start cutting well ahead of the edge and finish cutting slightly overrunning (see Figure 5 for both). Needless to say, the end grooves 27 should be the same depth as the groove 24.

[0050] In the initial gouging and fracture process, a crowbar-shaped tool 30 is inserted into the primary groove 24B to gouge out the strip-shaped pitch region 25 between the reference groove 24A and the primary groove 24B (see Figures 6 and 10(c)). The tip gouging portion 31 of the crowbar-shaped tool 30 is formed to be thin relative to the groove width of the groove 24, and the crowbar-shaped tool 30 is inserted into the primary groove 24B so that the tip of the tip gouging portion 31 reaches the bottom of the groove 24.

[0051] In this state, the grip portion 33 of the crowbar-shaped tool 30 is pulled downwards, and the gouging tip 31 gouges and destroys the strip-shaped pitch area 25 (including the surface of the concrete structure 22). Because the width of the gouging tip 31 is narrower than the length of the strip-shaped pitch area 25, this gouging is performed in multiple steps while moving the crowbar-shaped tool 30 laterally. During the gouging, the strip-shaped pitch area 25 (concrete) is destroyed with a "crumbly" feeling.

[0052] In the continuous groove formation process, secondary grooves 24C are formed in the finishing material 23 parallel to one end A of the strip-shaped pitch region 25, maintaining a pitch interval D (see Figures 7 and 11(d)). In this case as well, the secondary grooves 24C are formed according to the marking lines. Furthermore, by forming these secondary grooves 24C, a new secondary strip-shaped pitch region 25A is constructed.

[0053] In the subsequent gouging and fracture process, the crowbar-shaped tool 30 is inserted into the secondary groove 24C and gouged out, gouging out the secondary strip-shaped pitch region 25A formed by the secondary groove 24C (see Figures 8 and 11(e)). In this case as well, the gouging tip 31 of the crowbar-shaped tool 30 is inserted deeply into the secondary groove 24C, gouging and fracture the secondary strip-shaped pitch region 25A, including the surface of the concrete structure 22.

[0054] The process of forming a continuous groove and the process of gouging and breaking are repeated until the lower end (joint portion) of the area to be chipped 26 is reached (see Figures 9 and 11(f)). Finally, the process is completed by completely removing any remaining joint material (debris) around the area to be chipped 26.

[0055] As described above, according to the wall chipping method of this embodiment, a cutting device 10 is used to form cutting grooves 24 (reference cutting groove 24A, primary cutting groove 24B, and secondary cutting groove 24C), and the resulting strip-shaped pitch area 25 (secondary strip-shaped pitch area 25A) is gouged out using a crowbar-shaped tool 30. By repeating the formation of the cutting grooves 24 and the gouging out of the strip-shaped pitch area 25, the finishing material 23 in the desired area can be easily and appropriately chipped away from the surface of the concrete structure 22. Furthermore, compared to chipping away the finishing material 23 with a hammer drill or the like, the generation of noise can be suppressed as much as possible.

[0056] On the other hand, since the grooves 24 (reference groove 24A, primary groove 24B, and secondary groove 24C) are cut into the surface of the concrete structure 22, the surface of the concrete structure 22 after the strip-shaped pitch area 25 and secondary strip-shaped pitch area 25A are destroyed and becomes roughened. Therefore, there is no need to adjust the surface of the concrete structure 22 when replacing the finishing material 23 (re-laying work), etc.

[0057] [Second Embodiment] Next, the chipping method for the wall 21 according to the second embodiment will be described with reference to Figures 12 to 15. The tile work on this wall 21 uses a so-called staggered joint layout. In a staggered joint, it is not possible to properly form the left and right end grooves 27 as in the first embodiment (through joint). That is, if the end grooves 27 are formed with the disc 11, it is not possible to cut deeply at the corners of the tiles 23b (cutting deeply would damage the adjacent normal tiles 23b above and below). Therefore, in a wall 21 with staggered joints, instead of end grooves 27, a perforated groove 28 consisting of multiple perforated sections 28a is formed (see Figure 13).

[0058] As shown in Figure 12, in this wall structure 21 with staggered joints, the area where cracks P have occurred in the tiles 23b (area requiring chipping 26) is chipped away from the surface of the concrete structure 22, removing the tiles 23b and mortar 23a (finishing material 23). In this area requiring chipping 26, the area of ​​the upper two tiles is chipped away first, followed by the area of ​​the lower three tiles.

[0059] In this case as well, during the initial groove formation process, a linearly extending reference groove 24A is formed in the finishing material 23, and a primary groove 24B parallel to the reference groove 24A is formed with a predetermined pitch interval D (10-15 mm). In addition, perforation grooves 28 extending in the vertical direction are formed at the left and right ends of the area to be chipped 26 (see Figure 13 for both).

[0060] In this case, the perforated groove 28 consists of three circular perforations 28a arranged in an overlapping vertical direction, and its depth is equivalent to that of the reference groove 24A and the primary groove 24B. It is preferable to use a diamond drill bit to form the perforations 28a, and the bit diameter and number of connections are determined so that no uncut material remains at the left and right ends of the tile 23b.

[0061] In the initial gouging and fracture process, similar to the first embodiment, a crowbar-shaped tool 30 is inserted into the primary groove 24B to gouge it out, gouging out the band-shaped pitch region 25 between the reference groove 24A and the primary groove 24B (see Figure 13). In this case as well, the crowbar-shaped tool 30 is used to gouge and fracture the band-shaped pitch region 25, including the surface of the concrete structure 22.

[0062] In the subsequent groove formation process, secondary grooves 24C are formed in the finishing material 23, parallel to one end A of the strip-shaped pitch region 25, while maintaining a pitch interval D. Furthermore, upon moving to the lower section of the area requiring chipping 26, the left and right perforated grooves 28 in the lower section are formed (see Figure 14).

[0063] In the subsequent gouging and fracture process, a crowbar-shaped tool 30 is inserted into the secondary groove 24C and gouged out, removing the secondary strip-shaped pitch region 25A formed by the secondary groove 24C (see Figure 14). In this case as well, the crowbar-shaped tool 30 is used to gouge and fracture the secondary strip-shaped pitch region 25A, including the surface of the concrete structure 22.

[0064] The process of forming a continuous groove and the process of gouging and breaking are repeated until the lower end (joint portion) of the area to be chipped 26 is reached (see Figure 15). Finally, the process is completed by completely removing the remaining joint material (debris) around the area to be chipped 26.

[0065] As described above, in the chipping method for the wall 21 of the second embodiment, by repeatedly forming the cutting groove 24 and gouging out the strip-shaped pitch region 25, the finishing material 23 in the desired area can be easily and appropriately chipped away from the surface of the concrete structure 22.

[0066] [Third Embodiment] Next, with reference to Figure 16, the chipping method for the wall 21 according to the third embodiment will be described. This chipping method involves replacing one tile 23b, and a diamond core bit is used to form the perforated groove 28 (perforated portion 28a).

[0067] Although the area requiring chipping 26 is equivalent to one small tile 23b, in the initial groove formation process, a linear reference groove 24A is formed in the finishing material 23, and a primary groove 24B parallel to the reference groove 24A is formed with a predetermined pitch interval D (10-15 mm). In addition, perforation grooves 28 extending in the vertical direction are formed at the left and right ends of the area requiring chipping 26 (see Figure 16(a)).

[0068] In this case, the formation of the reference groove 24A and the primary groove 24B is simply done by cutting to a predetermined depth without moving the disk 11 laterally (see Figure 16(b)). The perforated groove 28 consists of three circular perforations 28a connected vertically. However, since the perforated groove 28 is perforated by a core bit, the core C remains in the hatched area shown in the figure (Figure 16(a)).

[0069] Figure 16(c) shows the prying jig 40 for gouging and destroying the core C. The prying jig 40 is cylindrical overall, with a half-cutout at the bottom. The lower part of the prying jig 40 is inserted deeply into the core C, embracing it, and then prying to destroy the core C.

[0070] In the initial gouging and fracture process, a crowbar-shaped tool 30 is inserted into the primary groove 24B to gouge it out, gouging out the strip-shaped pitch region 25 between the reference groove 24A and the primary groove 24B. In the continuous groove formation process, a secondary groove 24C is formed in the finishing material 23, parallel to one end A of the strip-shaped pitch region 25, while maintaining a pitch interval D. In the subsequent gouging and fracture process, a crowbar-shaped tool 30 is inserted into the secondary groove 24C to gouge out the secondary strip-shaped pitch region 25A formed by the secondary groove 24C.

[0071] As described above, in the chipping method for the wall 21 of the third embodiment, by repeatedly forming the cutting groove 24 and gouging out the strip-shaped pitch area 25, one tile 23b (the chipping area 26 for one tile) can be easily and appropriately chipped away from the surface of the concrete structure 22.

[0072] [Fourth Embodiment] Next, with reference to Figures 17 to 19, the chipping method for the wall 21 according to the fourth embodiment will be described. This chipping method is mainly intended for wall 21s made of small tiles such as "New Koguchi" and "50 Sancho" (see Figure 17), and is effective when the adhesion strength of the mortar is relatively weak.

[0073] The chipping method includes a groove formation step (see Figure 18) in which vertical grooves 24E and horizontal grooves 24F are formed in the joint B so as to surround all the tiles 23b within the chipping area 26, and a gouging and destruction step (see Figure 19) in which a crowbar-shaped tool 30 is inserted into the horizontal grooves 24F to gouge out and gouge out all the tiles 23b one by one. In this case as well, the formation of the vertical grooves 24E and horizontal grooves 24F in the joint B is to the depth of cutting into the concrete structure 22.

[0074] As shown in Figure 17, in this wall 21 (through joint), the area where cracks P have occurred in the tiles 23b (area requiring chipping 26) is chipped away from the surface of the concrete structure 22 by chipping away the tiles 23b and mortar 23a (finishing material 23). In this case, unlike other embodiments, the chipping action is performed for eight tiles (eight times), with each tile 23b being treated as a unit, thereby chipping away the finishing material 23 in the area requiring chipping 26.

[0075] In the groove formation process, vertical grooves 24E and horizontal grooves 24F are formed in the joint B portion so that all tiles 23b within the chipping area 26 are surrounded by grooves 24 (see Figure 18). In this case as well, the vertical grooves 24E and horizontal grooves 24F should be cut starting well ahead and ending with a slight overrun. Furthermore, the depth of the cut into the concrete structure 22 is preferably 10 to 15 mm, as in other embodiments.

[0076] In the gouging and breaking process, a crowbar-shaped tool 30 is inserted into the horizontal groove 24F on the underside (or topside) of the tile 23b to be chipped away, and the tile 23b (and mortar 23a) is gouged out (see Figure 19). This is repeated eight times for eight tiles to gouge and break all of the tile 23b. Finally, any remaining grout or debris around the area to be chipped away 26 is completely removed, and the process is completed.

[0077] As described above, in the chipping method for the wall 21 of the fourth embodiment, by forming vertical and horizontal grooves 24 in relation to the joint B and performing gouging and destruction in units of tiles 23b, the finishing material 23 in a desired area can be easily and appropriately chipped away from the surface of the concrete structure 22.

[0078] In addition, although the fourth embodiment was described using continuous tile laying as an example, in the case of staggered joints, it is preferable to form a perforated groove 28 consisting of a plurality of perforated portions 28a connected together instead of the vertical cut groove 24E. That is, in the case of staggered joints, it is preferable to form a perforated groove 28 consisting of a plurality of circular perforated portions 28a connected together so as to overlap in the vertical direction, in place of the vertical cut groove 24E, similar to the second embodiment. [Explanation of symbols]

[0079] 10...Cutting device, 11...Disc, 14...Device body, 15...Mounting unit, 16...Disc cover, 21...Wall, 22...Concrete structure, 23...Finishing material, 23a...Mortar, 23b...Tile, 24...Cutting groove, 24A...Reference cutting groove, 24B...Primary cutting groove, 24C...Secondary cutting groove, 24E...Longitudinal cutting groove, 24F...Transverse cutting groove, 25...Strip-shaped pitch area, 25A...Secondary strip-shaped pitch area, 26...Area requiring chipping, 27...End cutting groove, 28...Drilling groove, 28a...Drilling section, 30...Crowbar-shaped tool, 31...Tip gouging section, 40...Prying jig, A...Edge, B...Joint, C...Edge, D...Pitch spacing

Claims

1. A wall chipping method for chipping away the finishing material in a required chipping area of ​​a wall in which a finishing material containing mortar has been applied to the surface of a concrete structure, The initial groove forming step involves forming a linearly extending reference groove in the finishing material, and forming primary grooves parallel to the reference groove with a predetermined pitch interval, An initial gouging and destruction step in which a crowbar-shaped tool is inserted into the primary groove and gouged out, gouging out the reference groove and the strip-shaped pitch region between the primary grooves, A wall chipping method characterized by comprising: a step of forming a secondary groove in the finishing material, which maintains the pitch interval and is parallel to one end of the strip-shaped pitch region; and a repeating step of inserting the crowbar-shaped tool into the secondary groove and gouging, thereby gouging out the secondary strip-shaped pitch region formed by the secondary groove.

2. The reference groove, the primary groove, and the secondary groove each extend horizontally, The wall chipping method according to claim 1, characterized in that the initial groove formation step, the initial gouging and destruction step, and the repeating step are carried out from top to bottom.

3. The width of the notched tip of the crowbar-shaped tool inserted into the secondary groove is 40 to 50 mm. The wall chipping method according to claim 1, characterized in that the aforementioned strip-shaped pitch region and the aforementioned secondary strip-shaped pitch region are each gouged out in multiple stages.

4. The wall chipping method according to claim 1, characterized in that the reference groove, the primary groove, and the secondary groove each reach the concrete structure.

5. The wall chipping method according to claim 4, characterized in that the depth of the cuts made into the concrete structure by the reference groove, the primary groove, and the secondary groove are each the same as the pitch interval.

6. The wall chipping method according to claim 1, characterized in that the pitch interval is 10 to 15 mm.

7. The wall chipping method according to claim 1, characterized in that end grooves are formed at both ends of the chipping area that is perpendicular to the reference groove.

8. The wall chipping method according to claim 1, characterized in that a perforation groove, consisting of a plurality of connected perforations, is formed at both ends of the area to be chipped, perpendicular to the reference cutting groove.

9. A wall chipping method for chipping away finishing materials consisting of mortar and tiles from areas of a wall that need to be chipped away, where the finishing materials are attached to the surface of a concrete structure, A groove forming step in which vertical grooves and horizontal grooves are formed in the concrete structure with a depth that cuts into the joints so as to surround all the tiles within the area to be chipped, A wall demolition method characterized by comprising a demolition step of inserting a crowbar-shaped tool into the aforementioned cross groove and gouging it out to remove all of the aforementioned tiles one by one.

10. The wall chipping method according to claim 9, characterized in that instead of the aforementioned vertical groove, a perforated groove consisting of a series of perforated sections is formed.

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