JP2008297726A - Device for repairing crack in wall - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To force-feed a filler with a high pressure by hardly allowing a suction block to be separated from a wall surface even if a moment is caused on an arm. <P>SOLUTION: This device S for repairing a crack in a wall comprises: an injection nozzle 10, the leading end of which is arranged in the crack 2 in the wall and which injects the filler into the crack 2; the sucker 20 attached to the wall surface by suction and detached from the wall surface by relieving the suction; and an arm 30 which is provided on the sucker 20 and the leading end 31 of which is fitted with the injection nozzle 10. An intermediate portion 32 of the arm 30 is supported on the sucker 20 in such a manner as to be orthogonal to a central axis 34 through the intermediate portion 32, and through the leading end portion 31, intermediate portion 32 and back end portion 33 of the arm, and to be rotatable on a horizontal axis 35 parallel to the wall surface 1. An abutting member 40, the leading end of which abuts on the wall and which bears a moment load occurring in the arm 30 when the filler is infilled by means of the injection nozzle 10, is attached to the back end portion 33 of the arm 30. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a wall crack repairing apparatus for repairing a crack generated in a wall made of concrete or mortar by filling with a filler.

Conventionally, as this kind of wall crack repairing apparatus, for example, one disclosed in Japanese Patent Application Laid-Open No. 2004-92029 (Patent Document 1) previously proposed by the present applicant is known.
As shown in FIG. 8, there are an injection nozzle 110 whose tip is arranged in the crack 100 of the wall and injecting a filler into the crack 100, and a pair of suction blocks 120 attached to the wall surface by suction and separated by releasing the suction. Each suction block 120 includes a pair of arms 130 each provided with a rear end portion 132 and a tip portion 131 to which the injection nozzle 110 is attached.

  When this wall crack repairing apparatus Sa is used, the position of the injection nozzle 110 is roughly selected with respect to the crack 100 of the wall surface to be repaired, and the suction block 120 is positioned at a position near the position where there is no crack 100. Adsorb and fix. The rear end portion 132 of the arm 130 is slidably fixed to the suction block 120, and the rear end portion 132 of the arm 130 is slid to position the tip 111 of the injection nozzle 110 at the position of the crack 100. In this state, the filler is discharged from the injection nozzle 110 to fill the crack 100 with the filler.

Such a wall crack repairing device Sa can adjust the position of the injection nozzle 110 by adjusting the position of the rear end 132 of the arm 130 without moving the suction block 120 once sucked. The position adjustment and operation of the injection nozzle 110 are facilitated.
In addition, since a pair of suction blocks 120 are used, the arms 130 are connected, and the tip 131 is shared, even when the suction of one of the suction blocks 120 is defective, the other suction block 120 is sucked. It can be fixed to the wall.

JP 2004-92029 A

  By the way, in this conventional wall crack repairing apparatus Sa, although a pair of suction blocks 120 are used, the rear end portion 131 of the arm 130 is fixed to the suction block 120, and the injection nozzle 110 is cantilevered by the arm 130. Since it is supported, when a high pressure is applied to the injection nozzle 110 during filling of the filler, there is a problem that a moment is generated in the arm 130 and the suction block 120 is easily peeled off from the wall surface.

  The present invention has been made in view of such problems, and provides a wall crack repairing apparatus that makes it difficult for an adsorption block to be peeled off from a wall surface even when a moment occurs in an arm, and can pump a filler at high pressure. With the goal.

  In order to achieve such an object, the wall crack repairing apparatus of the present invention comprises an injection nozzle for injecting a filler into a crack in the wall and injecting a filler into the crack, and being attached to the wall surface by adsorption and detached by desorption. In a wall crack repairing apparatus comprising: an adsorption block that is provided; and an arm that is provided on the adsorption block and to which the injection nozzle is attached at a distal end portion, an intermediate portion of the arm passes through the intermediate portion with respect to the adsorption block, and the arm Is supported so as to be rotatable about a horizontal axis that is perpendicular to the central axis passing through the tip, middle, and rear end of the arm and parallel to the wall surface, and the tip is in contact with the wall at the rear end of the arm. A contact member that receives a moment load generated in the arm when the filler is filled with the nozzle is attached.

  Thus, when filling the wall crack with filler, depending on the crack state of the wall surface to be repaired, roughly select the optimal injection nozzle position, and in the vicinity of this position without cracks, The suction block is arranged and the suction block is sucked and fixed on the wall surface, and the injection nozzle is positioned at the selected crack position. In this state, when the filler is discharged from the injection nozzle, the filler is filled into the crack. At this time, a high pressure acts on the injection nozzle due to the pumping of the filling material, and a reaction force is generated. A moment about the horizontal axis is generated in the arm, and the arm tries to rotate around the middle part. Since the abutment member attached to the abutment abuts against the wall surface, the moment load generated on the arm by the abutment member can be received, so that the suction block is hardly peeled off from the wall surface. For this reason, the filler can be pumped at a high pressure from the injection nozzle to reliably fill the crack to be repaired.

  And if needed, it is set as the structure which made the distance between the said front-end | tip part and an intermediate part equal to the distance between the said rear-end part and an intermediate part. Since the three points of the tip, middle, and rear end are provided at equal distances, the reaction force received by the injection nozzle and the reaction force received by the contact member are equalized by the lever principle. The nozzle is less likely to be separated from the wall surface, and the filler can be reliably filled into the crack to be repaired. Also, the middle part of the arm serves as a fulcrum, and the reaction force generated by the injection nozzle, which is the power point, is applied to the contact member, which is the point of action, so the force generated in the separation direction of the suction block is equalized. The adsorption block is hardly peeled off from the wall surface.

  Moreover, it is set as the structure which made variable at least any one of the protrusion dimension with respect to the said arm of the said injection nozzle, and the protrusion dimension with respect to the said arm of the said contact member as needed. Thereby, when setting the crack repair apparatus of a wall to a wall surface, an injection | pouring nozzle and a contact member can be reliably contact | abutted with respect to a wall surface.

  Further, if necessary, the contact member is provided so as to be movable back and forth with respect to the arm, and a spring for biasing the contact member in the advance direction is provided. The followability to the unevenness of the wall surface is improved.

  In addition, if necessary, the intermediate portion of the arm is supported on the suction block via a universal joint. By making it universal, the arm can be rotated around three axes of the central vertical axis passing through the middle part of the arm among the central axis, the horizontal axis, and the vertical axis perpendicular to the central axis and perpendicular to the wall surface. Therefore, the position of the injection nozzle can be adjusted by rotating the arm. In the rotation range, the injection nozzle can be moved freely without moving the suction block once adsorbed. Nozzle position adjustment and operation become easy. Also, even if there are some irregularities on the wall surface, the arm rotates freely around the middle part, so the followability when setting the wall crack repair device to the wall surface or when reaction force acts on the arm is good Become.

If necessary, the distal end of the arm is constituted by a universal joint to which the injection nozzle is attached. As a result, the injection nozzle can rotate around three axes of the tip horizontal axis that passes through the tip of the arm parallel to the central axis and the horizontal axis, and the tip vertical axis that passes through the tip of the vertical axis. Therefore, the injection nozzle can be finely adjusted, and the position of the tip of the injection nozzle can be positioned corresponding to the unevenness or crack state of the wall surface.
In this case, it is effective to provide a lock mechanism that locks the rotation of the universal joint. After the position of the injection nozzle is determined, the injection nozzle is fixed to the tip of the arm by locking, and the tip does not move even when filling the filler, so the filler is reliably filled in the crack to be repaired. be able to.

Furthermore, if necessary, the rear end portion of the arm is constituted by a universal joint to which the contact member is attached. As a result, the abutting member can be rotated around three axes of a rear end horizontal axis passing through the rear end portion of the arm parallel to the central axis and the horizontal axis, and a rear end vertical axis passing through the rear end portion of the vertical axes. Become. Therefore, the contact member can be finely adjusted, and the distal end of the contact member can be reliably contacted with the wall surface to receive the force.
In this case, it is effective to provide a lock mechanism that locks the rotation of the universal joint. After determining the position of the abutting member, the abutting member is fixed to the rear end of the arm by locking and the tip does not move even if it receives the moment load generated on the arm when filling with filler. The contact member can be reliably brought into contact with the wall surface to receive a force.

  According to the wall crack repairing apparatus of the present invention, when the filler is discharged from the injection nozzle, a high pressure is applied to the injection nozzle due to the pumping of the filler to generate a reaction force, and a moment around the horizontal axis is generated in the arm. The arm tries to rotate around the middle part, but since the contact member attached to the rear end of the arm is in contact with the wall surface, it can receive the moment load generated on the arm by this contact member, Therefore, the suction block is hardly peeled off from the wall surface. For this reason, the filler can be pumped at a high pressure from the injection nozzle to reliably fill the crack to be repaired.

A wall crack repairing apparatus according to an embodiment of the present invention will be described below with reference to the accompanying drawings.
1 to 7 show a wall crack repairing apparatus S according to an embodiment of the present invention. A crack 2 is generated on the wall surface 1, and the crack 2 of the wall surface 1 is filled with a filler using the wall crack repairing apparatus S according to the embodiment of the present invention. The basic structure of the wall crack repairing apparatus S includes an injection nozzle 10, a suction block 20, an arm 30, and a contact member 40. The distal end portion 31 of the arm 30 is constituted by a universal joint 50 to which the injection nozzle 10 is attached, and the rear end portion 33 of the arm 30 is constituted by a universal joint 50 to which the contact member 40 is attached.

  As shown in FIGS. 1, 2, and 7, the injection nozzle 10 is attached to a universal joint 50 as a distal end portion 31 of an arm 30, and is provided at a tubular nozzle body 11 and the distal end of the nozzle body 11. A discharge rod 12 having a discharge port is provided. As shown in FIGS. 1 to 5 and 7, the universal joint 50 includes a spherical rotating member 51 and a ring-shaped holding ring 52 that rotatably holds the rotating member 51. The rotating member 51 is formed of a lightweight metal into a spherical shape, and is provided with a through hole 53 that passes through the center thereof. The holding ring 52 holds the outer periphery of the rotating member 51. The holding ring 52 is formed with a male screw 54, screwed into a female screw formed at the end of the arm 30, and fixed by a nut 55.

  A male thread 13 is formed on the nozzle body 11. The injection nozzle 10 is rotatable about three axes: a distal horizontal axis 35a passing through the distal end 31 of the arm 30 parallel to the central axis 34 and the horizontal axis 35, and a distal vertical axis 36b passing through the distal end 31 among the vertical axes. The through hole 53 of the universal joint 50 is inserted. Further, a nut 14 that is screwed onto the male screw 13 is provided, and the protruding dimension of the injection nozzle 10 relative to the arm 30 described later can be varied by the degree of tightening of the nut 14 with respect to the male screw 13. A pair of the nuts 14 is provided so that the universal joint 50 is sandwiched vertically between the upper nut 14a and the lower nut 14b. Further, the nut 14 is provided at a position where it does not contact the holding ring 52 of the tip portion 31. The universal joint 50 is provided with a lock mechanism 60 that locks the rotation of the universal joint 50. In the lock mechanism 60, a screw 62 is screwed into the female screw 61 provided on the holding ring 52 from the outside, and the tip of the screw 62 is brought into contact with the rotating member 51 to suppress the rotation of the rotating member 51.

The discharge rod 12 is provided with a cylindrical elastic contact member 15 that elastically contacts the wall surface 1. The elastic contact member 15 is formed in a ring shape with resin, and is provided so as to protrude from the tip of the discharge rod 12.
In FIG. 1, reference numeral 16 is a pipe connected to the nozzle body 11 of the injection nozzle to pump the filler, and reference numeral 17 is a pressure gauge provided on the pipe 16. Reference numeral 18 is an open / close switching valve provided on the piping system. Further, reference numeral 70 denotes an injection pump that is connected to the open / close switching valve 18 and sends a filler to the injection nozzle 10.

  As shown in FIGS. 1, 3, and 7, the suction block 20 includes a block main body 21 made of a lightweight metal. On the side of the block body 21 in contact with the wall surface 1, a recess 22 is formed so that the inside can be made negative pressure, and an air suction port 23 communicating with the recess 22 is provided. A rubber packing 25 that elastically contacts the wall surface 1 is provided at the opening edge 24 of the recess 22.

  In FIG. 1, reference numeral 26 denotes a suction pipe that is connected to the air suction port 23 and sucks air in the recess 22. Reference numeral 71 is a suction pump that sucks air in the recess 22, and reference numeral 27 is provided on the system path of the suction pipe 26 and connects the recess 22 and the suction pump 71, or the recess 22. Is a switching valve that opens the atmosphere.

  As shown in FIGS. 1 to 3 and FIGS. 5 to 7, the arm 30 is formed of a lightweight metal in a rectangular parallelepiped shape. The intermediate portion 32 of the arm 30 has an intermediate vertical shaft 36 a passing through the intermediate portion 32 of the arm 30 among the central shaft 34, the horizontal shaft 35, and the vertical shaft 36 perpendicular to the central shaft 34 and perpendicular to the wall surface 1. It is supported so as to be rotatable about an axis. Specifically, the intermediate portion 32 of the arm 30 is supported so as to be sandwiched between the nut 37 and the support portion 38 provided in the suction pipe 26 via the universal joint 50 similar to the above with respect to the suction block 20. . Further, the nut 37 and the support portion 38 are provided at positions that do not contact the holding ring 52 of the universal joint 50. Further, the distance between the distal end portion 31 and the intermediate portion 32 of the arm 30 and the distance between the rear end portion 33 and the intermediate portion 32 of the arm 30 are formed to be equal.

  As shown in FIGS. 1 and 5, the abutting member 40 is attached to a universal joint 50 as the rear end portion 33 of the arm 30, and the tip 43 abuts against the wall surface 1, so that the filling material by the injection nozzle 10 is filled. A bolt 41 that receives a moment load generated in the arm 30 during filling and a nut 42 that is screwed into the bolt 41 are provided. The abutment member 40 includes a rear end horizontal shaft 35b passing through the rear end portion 33 of the arm 30 in parallel with the central axis 34 and the horizontal axis 35, and a rear end vertical shaft 36c passing through the rear end portion 33 of the vertical shafts 36. The arm 30 is attached to the rear end portion 33 so as to be rotatable about an axis.

The bolt 41 is inserted into the through hole 53 of the universal joint 50 and is provided so as to be able to advance and retract relative to the arm 30. Further, the bolt 41 is provided with a spring 44 that urges the bolt 41 in the advancing direction. The spring 44 is set to an appropriate strength that can receive a moment load generated in the arm 30.
The nut 42 is formed in a shape that is screwed onto the bolt 41, and the projecting dimension is varied depending on the degree of tightening of the nut 42 to the bolt 41. The nut 42 is provided at a position where it does not contact the holding ring 52 of the rear end portion 33.

  When filling the crack 2 of the wall surface 1 with the filler using the wall crack repairing apparatus S according to the present embodiment configured as described above, it is performed as follows. First, the optimum position of the injection nozzle 10 is roughly selected depending on the state of the crack 2 in the wall surface 1 to be repaired. Then, as shown in FIG. 6, the suction block 20 is positioned at an appropriate position not including the crack 2 in the vicinity of this position, the suction pump 71 is driven, the air in the recess 22 is drawn, and the wall 1 is blocked. The main body 21 is adsorbed and fixed. At this time, the tip of the injection nozzle 10 is not in contact with the wall surface 1. Since the block body 21 is provided with the packing 25, the outside air does not enter even when negative pressure is applied, and the adsorption block 20 can be more firmly adsorbed to the wall surface 1.

  In this state, the arm 30 is rotated around the intermediate vertical axis 36a, and the tip 31 is positioned at the position of the crack 2 in the selected wall surface 1. In this case, the arm 30 can be rotated 360 ° with respect to the intermediate vertical shaft 36 a, so that the position of the injection nozzle 10 can be adjusted by the arm 30.

  Next, the injection nozzle 10 is rotated to make fine adjustments, and the tip of the injection nozzle 10 is positioned at the position of the crack 2 in the wall surface 1. The injection nozzle 10 is attached to a universal joint 50 that is rotatable about three axes of the central axis 31 of the arm 30, the distal horizontal axis 35a, and the distal vertical axis 36b. It can be positioned corresponding to the state of the crack 2.

  Then, a pair of nuts 14 are rotated and screwed into the male screw 13 of the injection nozzle 10, and the projecting dimension of the injection nozzle 10 is varied according to this tightening degree, and the elastic contact member 15 of the discharge rod 12 is moved. Elastically contact the wall 1. In order to lengthen the protruding dimension, first, the upper nut 14a sandwiching the universal joint 50 is rotated and loosened to be positioned at a desired position. Next, the lower nut 14b is rotated and tightened. It is fixed at the position where the rotating member is in contact with the upper nut 14a. In order to shorten the protruding dimension, the lower nut 14b is positioned at a desired position and is tightened with the upper nut 14a. By changing the projecting dimension, the tip of the injection nozzle 10 can be reliably brought into contact with the wall surface 1. Moreover, since the nut 14 is not in contact with the holding ring 52, the rotation of the injection nozzle 10 is not hindered. Further, the elastic contact member 15 makes it difficult for the discharge rod 12 to be rubbed against the wall surface 1, so that the wall surface 1 is hardly damaged.

  When the position of the injection nozzle 10 is determined, it is locked by the lock mechanism 60. Specifically, the screw 62 is screwed into the female screw 61 provided on the holding ring 52 of the tip 31 from the outside, and the tip of the screw 62 is brought into contact with the rotating member 51 to suppress the rotation of the rotating member 51. By locking, the injection nozzle 10 is fixed to the tip 31 of the arm 30 and the tip does not move even when the filler is filled, so that the filler 2 can be reliably filled into the crack 2 to be repaired.

  Next, the contact member 40 is rotated to make fine adjustments, and the tip 43 of the contact member 40 is brought into contact with the wall surface 1. Since the abutting member 40 is attached to a universal joint that is rotatable about three axes of the central axis 34 of the arm 30, the rear end horizontal axis 35b, and the rear end vertical axis 36c, the tip 43 of the abutting member 40 is attached to the wall surface. 1 can be positioned horizontally. At this time, the nut 42 is rotated and screwed into the bolt 41, and the protruding dimension is varied depending on the degree of tightening of the nut 42 to the bolt 41. Thereby, the tip 43 of the contact member 40 can be reliably brought into contact with the wall surface 1. Further, since the nut 42 is not in contact with the holding ring 52, the rotation of the contact member 40 is not hindered.

  When the tip 43 of the contact member 40 is positioned horizontally with respect to the wall surface 1, the contact mechanism 40 is locked by the lock mechanism 60. This locking mechanism 60 is the same as the locking mechanism 60 of the injection nozzle 10. By locking, the abutting member 40 is fixed to the rear end portion 33 of the arm 30, and even if it receives a moment load generated in the arm 30 when the filler is filled, the tip 43 does not move. 1 can be reliably brought into contact.

In this state, the infusion pump 70 is driven. As a result, the filler is discharged from the injection nozzle 10, and the filler is filled into the crack 2 of the wall surface 1. In this case, since the inside of the recess 22 of the suction block 20 has a negative pressure, the suction block 20 is pressed against the wall surface 1 at atmospheric pressure, so that the injection nozzle 10 can be firmly fixed to the wall surface 1 and the injection The filler can be filled from the nozzle 10 at high pressure.
For example, pumping at a pressure of about 27 kgf / cm ² (≈2.7 Mp) becomes possible.

  As shown in FIG. 7, when filling the filler, a high pressure is applied to the injection nozzle 10 by pumping the filler to generate a reaction force, and a moment M about the horizontal axis 35 is generated in the arm 30. Since the contact member 40 attached to the rear end portion 33 contacts the wall surface 1 and receives the moment load generated on the arm 30, the suction block 20 is hardly peeled off from the wall surface 1. At this time, the injection nozzle 10 is unlikely to be separated from the wall surface 1 by the biasing force of the spring 44 provided on the contact member 40.

  Further, since the elastic contact member 15 is provided on the discharge rod 12, the tip of the injection nozzle 10 is in close contact with the wall surface 1, so that the filler is hard to leak and filling is performed reliably.

  After filling the filler to some extent, the injection nozzle 10 is moved to another part of the crack 2. In this case, first, the injection nozzle 10 and the contact member 40 are unlocked. Since the lock 62 need only be removed from the female screw 61, the structure of the lock mechanism 60 is simplified. Then, the injection nozzle 10 and the tip 43 of the contact member 40 are separated from the wall surface 1. In this state, the arm 30 is appropriately rotated around the intermediate vertical axis 36a to position the tip 31 at the selected crack 2 position. Therefore, the injection nozzle 10 can be moved freely without moving the suction block 20 once adsorbed one by one, so that the position adjustment and operation of the injection nozzle 10 are facilitated.

  Next, the projecting dimensions and orientation are adjusted so that the tip of the injection nozzle 10 and the contact member 40 are in contact with the wall surface 1 reliably, and the injection mechanism 10 is locked by the lock mechanism 60.

  Such work is repeated several times to perform work within the reach of the arm 30. When the work within the reach of the arm 30 is completed, the suction pump 71 is stopped, the suction block 20 is removed from the wall surface 1, and the suction block 20 is moved to the next position.

  In the above embodiment, the block main body 21 and the arm 30 are made of a lightweight metal, but the present invention is not necessarily limited to this, and any material may be used and may be appropriately changed.

It is a perspective view which shows the crack repair apparatus of the wall which concerns on embodiment of this invention. It is sectional drawing which shows the injection | pouring nozzle of the crack repair apparatus of the wall which concerns on embodiment of this invention. It is sectional drawing which shows the intermediate part of the crack repair apparatus of the wall which concerns on embodiment of this invention. It is a section perspective view showing a universal joint concerning an embodiment of the invention. It is sectional drawing which shows the contact member of the crack repair apparatus of the wall which concerns on embodiment of this invention. It is a figure which shows the state which repairs a wall using the crack repair apparatus of the wall which concerns on embodiment of this invention. It is a side view which shows the state which repairs a wall using the crack repair apparatus of the wall which concerns on embodiment of this invention. It is a figure which shows an example of the conventional crack repair apparatus of a wall.

Explanation of symbols

S Wall crack repair device M Moment 1 Wall surface 2 Crack 10 Injection nozzle 11 Nozzle body 12 Discharge rod 13 Male thread 14 Nut 14a Nut 14b Nut 15 Elastic contact member 16 Pipe 17 Pressure gauge 18 On / off switching valve 20 Adsorption block 21 Block body 22 Recess 23 Air suction port 24 Open edge 25 Packing 26 Suction tube 27 Switching valve 30 Arm 31 Front end portion 32 Intermediate portion 33 Rear end portion 34 Central axis 35 Horizontal axis 35a Front end horizontal axis 35b Rear end horizontal axis 36 Vertical axis 36a Intermediate vertical Shaft 36b Front end vertical shaft 36c Rear end vertical shaft 37 Nut 38 Support portion 40 Contact member 41 Bolt 42 Nut 43 End 44 Spring 50 Universal joint 51 Rotating member 52 Holding ring 53 Through hole 54 Male screw 55 Nut 60 Lock mechanism 61 Female screw 62 Screw 70 Injection pump 71 Suction port Flop

Claims (9)

An injection nozzle that has a tip placed in the crack of the wall and injects a filler into the crack, an adsorption block that is attached to the wall by adsorption and can be released by desorption, and the injection nozzle is attached to the tip of the adsorption block. In the wall crack repairing device with the arm to be
An intermediate part of the arm is supported so as to be rotatable about a horizontal axis that is perpendicular to the central axis passing through the intermediate part, passing through the intermediate part, passing through the intermediate part and passing through the intermediate part and parallel to the wall surface. An apparatus for repairing a crack in a wall, characterized in that a contact member is attached to a rear end portion of the arm and a contact member that receives a moment load generated in the arm when the filler is filled with the injection nozzle.   The wall crack repairing apparatus according to claim 1, wherein a distance between the front end portion and the intermediate portion is equal to a distance between the rear end portion and the intermediate portion.   The wall crack repairing apparatus according to claim 1 or 2, wherein at least one of the projecting dimension of the injection nozzle with respect to the arm and the projecting dimension of the abutting member with respect to the arm is variable.   4. The wall crack repair according to claim 1, wherein the abutting member is provided so as to be movable back and forth with respect to the arm, and a spring is provided to urge the corresponding contact member in the advancing direction. apparatus.   The wall crack repairing device according to any one of claims 1 to 4, wherein an intermediate portion of the arm is supported to the suction block via a universal joint.   The wall crack repairing device according to any one of claims 1 to 5, wherein a tip end portion of the arm is constituted by a universal joint to which the injection nozzle is attached.   The wall crack repairing apparatus according to claim 6, further comprising a lock mechanism that locks the rotation of the universal joint.   The wall crack repairing device according to any one of claims 1 to 7, wherein a rear end portion of the arm is constituted by a universal joint to which the contact member is attached.   9. The wall crack repairing apparatus according to claim 8, further comprising a locking mechanism that locks the rotation of the universal joint.

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