JP2010216160A - Removal method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a removal method which enables the sure removal of an object portion alone. <P>SOLUTION: In this method for removing the surface layer 4 of a concrete structure 1 having the surface layer 4 superposed on an upper portion of a base layer 3 of a building frame 2, a groove 7 is formed in such a shape as to surround the object portion of the surface layer 4; a load application hole 15, the leading end of which reaches the base layer 3, is formed in the at least one location of the object portion enclosed with the groove 7; and a load acting in the direction of stripping off the object portion from the upper portion of the base layer 3 is applied to the object portion using the load application hole 15, so that the object portion can be removed from the upper portion of the base layer 3. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a removal method, and more particularly to a removal method effective for removing a surface layer portion of a concrete structure frame in renewal work such as seismic reinforcement of an existing concrete structure.

  When renewal work such as seismic reinforcement for an existing concrete structure, remove the surface layer (finished mortar layer, etc.) laminated on the upper part of the base layer of the frame, and then perform repairs for seismic reinforcement, etc. We are doing renovation work.

  In such renewal work, the surface layer was conventionally removed using devices such as an electric pitching machine and a high-speed rotary cutter device, but the surrounding living environment is affected by vibration and noise generated during the work. In recent years, various devices of low vibration and noise type have been used due to problems.

  An example of a low vibration, low noise type device is described in Patent Document 1. This device (surface layer removing device) is provided on the outside of the push rod member so as to sandwich the push rod member with the drive shaft for advancing and retracting the push rod member, And a pair of leg members provided with protrusions protruding to the opposite side.

  The surface layer part removing device having such a configuration forms a hole that penetrates the surface layer part of the housing and reaches the base layer part, inserts a pair of leg members into the hole, and advances the push rod member through the drive shaft. Then, the front end side of the push rod member is brought into contact with the projecting portion of each leg member, and the pair of leg members are swung in directions away from each other, and the protrusion of each leg member causes the base layer portion and the surface layer portion of the housing to By pressing the vicinity of the boundary surface, the surface layer portion is cracked, and the surface layer portion can be crushed into a block shape and removed from the upper portion of the base layer portion.

JP 2005-320723 A

  By the way, in the surface layer part removing device having the above-described configuration, when a crack is generated in the surface layer part by pressing the vicinity of the boundary surface between the base layer part and the surface layer part of the casing, the direction and length of the crack are set. Since it is difficult to predict, the crack may extend to the non-removal target portion, and it is impossible to reliably remove only the removal target portion.

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide a removal method that can reliably remove only a portion to be removed.

In order to solve the above problems, the present invention employs the following means.
That is, the present invention is a removal method for removing a predetermined target portion of a concrete structure, wherein a groove or a hole is formed so as to surround the target portion of the concrete structure, and the target surrounded by the groove or hole. A load application hole is formed in at least one portion of the portion, and the load is applied to the target portion in a direction to be peeled off from the concrete structure by using the load application hole. It is characterized by removing from.

According to the removal method of the present invention, a groove or a hole is formed so as to surround the target portion, a load applying hole is formed in the target portion surrounded by the groove or the hole, and the target portion is utilized using the load applying hole. By applying a load in the direction of peeling off from the concrete structure, the target portion can be cracked, and the target portion can be crushed into a block shape and removed from the concrete structure.
In this case, since the target portion is surrounded by the groove or hole and is cut off from the non-target portion, when a load is applied using the load applying hole, the crack passes through the groove or hole to the non-target portion. It does not extend, and only the target portion can be reliably removed.

  Further, the present invention is a method for removing the surface layer portion of the concrete structure in which the surface layer portion is laminated on the upper portion of the base layer portion of the housing, forming a groove or a hole so as to surround the target portion of the surface layer portion, A direction in which a load applying hole whose tip reaches the base layer portion is formed in at least one portion of the target portion surrounded by the groove or hole, and is peeled off from the upper portion of the base layer portion using the load applying hole. The target portion is removed from the upper portion of the base layer portion by applying a load to the base layer portion.

According to the removal method of the present invention, a groove or hole is formed so as to surround the target portion of the surface layer portion, a load applying hole is formed in the target portion surrounded by the groove or hole, and the load applying hole is used. By applying a load in the direction of peeling from the upper part of the base layer part to the target part, the target part can be cracked, and the target part is crushed into blocks by this crack and removed from the upper part of the base layer part. be able to.
In this case, since the target part is surrounded by the groove or hole and is edge-cut from the non-target part, when a load is applied using the load applying hole, the crack passes through the groove or hole to the non-target part. It does not extend, and only the target portion can be reliably removed.

  Further, in the present invention, a virtual cone is assumed in which the center of the load application hole is a vertical line, the surface of the concrete structure or the surface layer portion is a bottom surface, and the conical surface forms an angle of approximately 45 ° with respect to the vertical line. In this case, the groove or hole is formed inside the virtual cone so that the tip of the groove or hole reaches a position deeper than the conical surface of the virtual cone. It is good as well.

  According to the removal method of the present invention, when a load is applied to the target portion, a crack occurs along the conical surface of the virtual cone, but a groove or a hole is provided inside the virtual cone. Therefore, the crack can be stopped at this groove or hole portion, and the crack does not extend beyond the groove or hole to the non-target portion outside the virtual cone, and only the target portion is reliably removed. be able to.

  Furthermore, in the present invention, a reaction force is applied to the concrete structure itself or the base layer portion, and a load is applied to the concrete structure or the surface layer portion in a direction of peeling from the concrete structure or the base layer portion. Thus, the target portion may be removed.

  According to the removal method of the present invention, a reaction force is applied to the concrete structure itself or the base layer portion of the frame, and a load in the direction of peeling from the concrete structure or the surface layer portion is applied to the concrete structure or the surface layer portion, A crack can be generated in the concrete structure or the surface layer portion of the target portion, and the target portion can be crushed into blocks by the crack and removed from the upper portion of the concrete structure or the base layer portion.

  Furthermore, in the present invention, a pump unit having a pump for generating high-pressure water, a motor unit having a motor for rotating the pump, and a nozzle for injecting high-pressure water generated by the pump toward the target portion are provided. The groove or hole may be formed by a water jet device.

  According to the removal method of the present invention, when forming a groove or hole surrounding the target portion, there is no occurrence of large vibration or noise as in an electric pitching machine or a high-speed rotary cutter device, and vibration and noise are reduced. Since it can suppress, the influence on the surrounding living environment can be reduced.

  As described above, according to the removal method of the present invention, since the target portion is cut off from the non-target portion by the groove or the hole, the concrete structure or surface layer portion of the target portion is applied when a load is applied. Thus, the cracks that occur in the first and second portions do not extend beyond the groove or hole to the non-target portion, and only the target portion can be reliably removed.

It is the schematic which showed one Embodiment of the removal method by this invention, Comprising: It is explanatory drawing of a groove | channel formation process. It is explanatory drawing of a hole formation process. It is explanatory drawing of a removal process, Comprising: It is explanatory drawing which showed the state which inserted the removal jig | tool in the hole. It is explanatory drawing of a removal process, Comprising: It is explanatory drawing which showed the state of the removal of the removal target part by a removal jig. It is explanatory drawing which showed the relationship between the groove | channel formed in the groove | channel formation process, and the crack produced in the removal process. It is sectional drawing of FIG. It is the schematic which showed other embodiment of the removal method by this invention, Comprising: It is explanatory drawing which showed the relationship between the groove | channel formed by the groove | channel formation process, and the hole formed by the hole formation process. It is explanatory drawing which showed the state which inserted the removal jig | tool in the hole by the removal process. It is explanatory drawing which showed the process in the middle of removing a removal object part with a removal jig | tool. It is explanatory drawing which showed the state which removed the removal object part.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The removal method of the present embodiment is applied, for example, when renewal work such as seismic reinforcement is performed on an existing concrete structure. As shown in FIG. 1, the surface layer portion is formed above the base layer portion 3 of the casing 2. It is effective for removing the surface layer portion 4 of the existing concrete structure 1 on which 4 (finishing mortar layer or the like) is laminated, and thereafter performing repair or repair work for seismic reinforcement or the like.

The removal method of the present embodiment includes a groove forming step (see FIG. 1) for forming a groove 7 so as to surround a removal target portion 6 (hereinafter referred to as the target portion 6) of the frame 2 of the existing concrete structure 1. A hole forming step (see FIG. 2) for forming a load applying hole 15 (hereinafter referred to as hole 15) in the target portion 6 and a removing step (see FIGS. 3 and 4) for removing the target portion 6 are provided. Yes.
Hereinafter, each step will be described in detail.

(1) Groove Forming Step As shown in FIG. 1, in the groove forming step, for example, one side is formed so as to surround the target portion 6 of the surface layer portion 4 of the housing 2 using a groove cutting device (not shown). A rectangular groove 7 having a width of 200 to 400 mm and a width of several millimeters is formed. In this case, the position where the groove 7 is formed and the depth of the groove 7 are set according to the thickness of the surface layer portion 4 of the target portion 6.

  That is, in the hole forming step described later, as shown in FIGS. 2 to 4, a hole 15 that penetrates the surface layer portion 4 and reaches the base layer portion 3 is formed in the target portion 6. When a crack 25 is generated in the surface layer portion 4 of the target portion 6 by the removing device 20 described later, the crack 25 extends obliquely upward from the bottom portion 16 of the hole 15 along an inclined surface (conical surface 11) of about 45 °. Has characteristics. Therefore, as shown in FIGS. 5 and 6, a virtual cone 10 is assumed in which the center of the hole 15 is a perpendicular line 11, the surface of the surface layer portion 4 is a bottom surface 12, and the conical surface 13 is about 45 °. The position where the groove 7 is formed and the depth of the groove 7 are set so that the tip is located deeper than the conical surface 13 inside the cone 10. By setting the position and depth of the groove 7 in this manner, the crack 25 generated in the surface layer portion 4 is prevented from extending beyond the groove 7 to the non-removable target portion 8 (hereinafter referred to as the non-target portion 8). it can.

  As the grooving device, various grooving devices such as a high-speed rotary cutter device and a water jet device can be used. In the present embodiment, a water jet device is used as the grooving device.

  The water jet device includes, for example, a pump unit having a pump for generating high-pressure water, a motor unit having a motor for rotating the pump of the pump unit, a nozzle unit having a nozzle for injecting high-pressure water generated by the pump of the pump unit, A polishing agent supply unit that supplies the polishing agent to the nozzles of the nozzle unit, a high-pressure water and a recovery unit that recovers the polishing agent, and the like are provided.

  In order to form the groove 7 in the target portion 6 of the surface layer portion 4 of the casing 2 by the water jet device having the above-described configuration, the pump unit, the motor unit, the abrasive supply unit, and the recovery unit are driven, High-pressure water is supplied to the nozzle, the abrasive is supplied to the nozzle from the abrasive supply unit, and the high-pressure water and the abrasive are sprayed from the nozzle outlet toward the surface layer portion 4 of the housing 2.

  Then, by moving the nozzle so as to surround the target portion 6, the groove 7 corresponding to the movement locus of the nozzle can be formed in the surface layer portion 4. In this case, the high-pressure water, the abrasive, etc. used to form the groove 7 are collected by the collection unit and disposed.

  In the present embodiment, as shown in FIGS. 1 and 2, since it is assumed that the entire surface layer portion 4 of the housing 2 is removed, the surface layer portion 4 has a side of 200 to 400 mm, A rectangular groove 7 having a width of about several millimeters is formed in a lattice shape as a whole.

  In addition, when working in an isolated field where there is no restriction of vibration and noise, an electric high-speed rotary cutter device, a laser-type cutter device, or the like may be used. In the case of using an electric high-speed rotary cutter device, concrete cutting powder is scattered around, so it is necessary to take measures against dust. Moreover, since the laser-type cutter apparatus may vaporize suddenly and the blast state may be carried out in the concrete inside, it is necessary to ensure the safety | security of work. In addition, since the laser-type cutter apparatus melts the concrete with heat, there is a defect that the width of the groove 7 becomes non-uniform. Therefore, it is necessary to work in consideration of this point.

(2) Hole forming step As shown in FIG. 2, in the hole forming step, each object surrounded by a rectangular groove 7 formed in the groove forming step using a drilling device (not shown) such as a low noise core drill. A hole 15 that penetrates the surface layer portion 4 and reaches the base layer portion 3 through the surface layer portion 4 is formed at the center of the portion 6. In this case, the diameter of each hole 15 is set to such a size that a removal jig 23 of the removal device 20 described later can be inserted.

  Moreover, the hole 15 is formed in the center part of each object part 6, respectively so that the pitch between the adjacent holes 15 and 15 may be settled in the range of 200-400 mm. If the pitch between the holes 15 and 15 is larger than the range as described above, the crack 25 may be exerted on the entire target portion 6 when the target portion 6 is removed from the base layer portion 3 in the removing step described later. This is because it becomes difficult, and if the pitch between the holes 15 is made smaller than the above range, the number of times the punching device is used increases, resulting in inefficient work.

(3) Removal Step As shown in FIGS. 3 and 4, in the removal step, a removal device 20 is used to insert a removal jig 23 into each hole 15 of each target portion 6. A load is applied to the surface layer portion 4 of the target portion 6 in the direction of peeling from the base layer portion 3, and each target portion 6 is removed from the upper portion of the base layer portion 3.

  Here, as the removing device 20, for example, a hydraulic removing device 20 can be used. As shown in FIGS. 3 and 4, the hydraulic removal device 20 includes a hydraulic cylinder 21 that moves the rod 22 forward and backward by hydraulic pressure, and a removal treatment that expands and contracts the diameter by following the forward and backward movement of the rod 22 of the hydraulic cylinder 21. The tool 23 is provided.

  In order to remove each target portion 6 by the removing device 20 having the above-described configuration, a removal jig 23 is inserted into each hole 15 of each target portion 6 and the hydraulic cylinder 21 is operated as shown in FIG. Then, the rod 22 is advanced, and the removal jig 23 is expanded in diameter following the advance of the rod 22 to be brought into contact with the inner surface of the hole 15.

  Then, as shown in FIG. 4, the rod 22 of the hydraulic cylinder 21 is further advanced and brought into contact with the bottom 16 of the hole 15 (the base layer 3 of the housing 2), and a reaction force is applied to the base layer 3 of the housing 2. Further, by pressing the rod 22 in the direction of the base layer portion 3, a load is applied to the target portion 6 in the direction of peeling from the base layer portion 3 (the direction of leaving).

  Thereby, a crack 25 extending upward from the bottom 16 of the hole 15 along the conical surface 13 of the virtual cone 10 described above is generated in the surface layer portion 4 of the target portion 6, and the surface layer portion 4 of the target portion 6 is formed by this crack 25. The target portion 6 can be removed from the upper portion of the base layer portion 3 by being pulverized into blocks.

  In this case, as shown in FIGS. 5 and 6, a groove 7 is provided inside the virtual cone 10, and the tip of the groove 7 reaches a position deeper than the conical surface 13 of the virtual cone 10. The crack 25 extending upward from the bottom 16 of the hole 15 along the conical surface 13 of the virtual cone 10 does not extend beyond the groove 7 to the non-target portion 8, and only the target portion 6 is reliably removed. be able to.

  Since the crack 25 has a characteristic of extending in a direction orthogonal to the direction of diameter expansion by the removal jig 23, the rod 22 can be removed while changing the direction of insertion of the removal jig 23 into the hole 15 in various ways. By advancing, cracks 25 can be generated radially around the hole 15, and the target portion 6 can be finely crushed and removed from the upper portion of the base layer portion 3.

  And by repeating the above operations for each target portion 6, all the target portions 6 can be removed from the upper portion of the base layer portion 3, and the surface of the base layer portion 3 of the housing 2 is exposed. After this, it is possible to perform repairs, repairs, etc. for seismic reinforcement on the upper part of the base layer 3.

  In the removal method according to the present embodiment configured as described above, when the crack 25 is generated in the surface layer portion 4 of the target portion 6 by the removal device 20, the crack 25 extends to the non-target portion 8. Therefore, only the target portion 6 can be reliably removed.

7 to 10 show another embodiment of the removing method according to the present invention.
The removal method shown in the present embodiment is applied to the removal of the surface layer portion 4 of the casing 2 in which the tile 5 is attached to the surface of the surface layer portion 4, and the other configurations are those shown in the embodiment. It is the same.

  In this case, as shown in FIG. 7, the groove 7 is formed by the water jet device along the joint of the tile 5 of the target portion 6, and the tile 5 of the target portion 6 and the tile 5 of the non-target portion 8 are bordered. Later, a hole 15 that penetrates the tile 5 and the surface layer portion 4 and reaches the base layer portion 3 at a plurality of locations (two locations in the present embodiment) of the target portion 6 is formed by a punching device.

  Then, as shown in FIG. 8, the removal jig 23 of the removal device 20 is inserted into each hole 15, and as shown in FIG. 9, the removal jig 23 peels the target portion 6 from the base layer 3. By applying this load, the target portion 6 can be removed from the upper part of the base layer portion 3 as shown in FIG.

  Even in the present embodiment configured as described above, when the crack 25 is generated in the surface layer portion 4 of the removal target portion 6 by the removal device 20, as in the embodiment described above, the crack 25 Does not extend to the non-target portion 8, so that only the target portion 6 can be reliably removed.

  Thus, for example, when the desired area of the tile wall is removed for the purpose of preserving the tile wall of a historical building, the state of the tile wall may be even if the building is aged. It can be removed and stored while maintaining

In the above description, the grooves 7 are formed so as to surround the target portion 6, but holes may be formed at predetermined intervals so as to surround the target portion 6.
In the above description, the depth of the groove 7 is set so that the tip is located deeper than the conical surface 13 of the virtual cone 10. However, depending on the material and state of the target portion 6, the groove 7 The tip may be at a position shallower than the conical surface 13 of the virtual cone 10.

DESCRIPTION OF SYMBOLS 1 Concrete structure 2 Frame 3 Base layer part 4 Surface layer part 5 Tile 6 Target part 7 Groove 8 Non-target part 10 Virtual cone 11 Perpendicular line 12 Bottom face 13 Conical face 15 Load application hole 16 Bottom part 20 Removal device 21 Hydraulic cylinder 22 Rod 23 Removal Jig 25 Crack

Claims (5)

A removal method for removing a predetermined target portion of a concrete structure,
A groove or a hole is formed so as to surround the target portion of the concrete structure, a load applying hole is formed in at least one portion of the target portion surrounded by the groove or the hole, and the target is made using the load applying hole. The removal method characterized by removing the said object part from the said concrete structure by giving the load to the direction peeled off from the said concrete structure to a part. A method for removing the surface layer portion of the concrete structure in which the surface layer portion is laminated on the upper portion of the base layer portion of the casing,
A groove or hole is formed so as to surround the target portion of the surface layer portion, and a load applying hole whose tip reaches the base layer portion is formed in at least one location of the target portion surrounded by the groove or hole, and the load applying hole Removing the target portion from the upper portion of the base layer portion by applying a load to the target portion in a direction of peeling from the upper portion of the base layer portion.   When a virtual cone is assumed in which the center of the load-applying hole is a vertical line, the surface of the concrete structure or the surface layer portion is a bottom surface, and a conical surface forms an angle of about 45 ° with respect to the vertical line, The groove or hole is formed inside a cone, and the groove or hole is formed so that a tip of the groove or hole reaches a position deeper than a conical surface of the virtual cone. Item 3. The removal method according to Item 1 or 2.   By taking a reaction force on the concrete structure itself or the base layer portion, and applying a load in a direction of peeling from the concrete structure or the base layer portion to the concrete structure or the surface layer portion, the target portion is It removes, The removal method in any one of Claim 1 to 3 characterized by the above-mentioned.   The water jet device includes a pump unit having a pump for generating high-pressure water, a motor unit having a motor for rotating the pump, and a nozzle for injecting high-pressure water generated by the pump toward the target portion. The removal method according to any one of claims 1 to 4, wherein a groove or a hole is formed.

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