JP6889357B2 - How to form a slit - Google Patents

Description

The present invention relates to a method for forming a slit, and more particularly to a method for forming a seismic slit for forming a concrete building.

Traditionally, Japan has been a country with so many earthquakes that it is called an earthquake-prone country, and various preparations for earthquakes are indispensable. The most dangerous damage caused by this earthquake is the disaster caused by the collapse of buildings.

It is said that many buildings that are not seismically reinforced may collapse in an earthquake with a seismic intensity of 6 or higher, and in order to protect important lives and property from disasters such as earthquakes, we Japanese are aware of earthquake resistance. It is increasing day by day.

In the past earthquake damage, it has been reported that the pillars are greatly buckled due to the effects of miscellaneous walls such as waist walls and hanging walls installed near the pillars of buildings. This was because the length of the pillar was shortened due to the attachment of the miscellaneous wall near the pillar, and the stress due to the earthquake was concentrated on the shortened pillar, which made it easier for shear failure to occur.

Damage to the columns due to this shear failure led to the collapse of the building itself, which was extremely dangerous because it would increase the damage. Therefore, it is known that seismic retrofitting is performed by forming a slit between a column and a wall of a building to divide the column and the wall and reduce the influence of stress generated at the time of an earthquake on the column.

FIG. 8 is a diagram showing a state in which a seismic slit is formed near a pillar of a building.
As shown in FIG. 8, a wall body 3 formed between the pillars 1 and 2 is formed, and the wall body 3 is provided with an opening 4 for installing a window frame or the like.

By forming the opening 4 in the wall body 3, a waist wall 3a up to the floor surface 5 is formed in the lower part of the opening 4, and the ceiling surface 6 to the opening 4 is formed in the upper part of the opening 4. A hanging wall 3b up to the upper surface is formed.

In this way, the waist wall 3a and the hanging wall 3b are attached between the pillars 1 and 2, so that the pillars 1 and 2 are restrained, and the lengths of the pillars 1 and 2 are not the section L1 but the section L2. It will only be. In general, the shorter the length of the member, the larger the shearing force. Therefore, shear failure is likely to occur in the shortened columns 1 and 2 as in the section L2.

Therefore, by providing a seismic slit 7 and a seismic slit 8 in the pillar 1 and the pillar 2 so that the pillar 1 or the pillar 2 and the wall body 3 are not connected, the length of the pillar 1 or the pillar 2 is set from the section L2. It can be a long section L1.

By forming the seismic slit 7 and the seismic slit 8 in the building in this way, the wall 3 and the pillar 1 or the pillar 2 are separated, and the length of the pillar 1 or the pillar 2 is not shortened. Alternatively, the shear failure of the column 2 can be suppressed. In other words, when an earthquake occurs, the collapse of buildings can be minimized.

In addition, the seismic slits 7 and 8 are not only formed in new buildings, but also by forming seismic slits 7 and 8 in old buildings that do not meet the current seismic standards to provide seismic reinforcement. It can be renovated into a building with seismic performance that meets the standards.

As described above, in order to efficiently form seismic slits 7 and 8 on a concrete wall, a multi-axis core drill device for linearly drilling a plurality of holes in a concrete structure and a multi-axis core drill device are used. The method of forming the slit used is known (see, for example, Patent Document 1).

FIG. 9 is a diagram showing a multi-axis core drill device for forming a slit in a concrete structure.
As shown in FIG. 9, the multi-axis core drill device 10 is for rotationally driving the core drills 11A to 11C and the drill body 11 provided with the core drills 11A to 11C aligned in a straight line at predetermined intervals. It includes a drive mechanism 12.

Further, the drill body 11 includes a first guide mechanism 13 for advancing or retracting the drill body 11 with respect to the concrete wall 20 of the concrete structure, and a core drill 11A to the first guide mechanism 13 parallel to the concrete wall 20. It is provided with a second guide mechanism 14 for guiding along the alignment direction of 11C.

FIG. 10 is a diagram showing a method of forming a slit in a concrete structure using a multi-axis core drill device.
As shown in FIG. 10, in order to form a rectangular slit S in the concrete wall 20, a multi-axis core drill device 10 is used to form a continuous hole in the concrete wall 20.

First, the second guide mechanism 14 is fixed to the concrete wall 20 so that the core drills 11A to 11C correspond to the positions where the slits S are formed in the concrete wall 20. Specifically, the fixed position of the second guide mechanism 14 is adjusted, and the position of the drill body 11 is determined so that the core drills 11A to 11C come to the center position of the formation position of the slit S.

After the horizontal position of the drill body 11 is determined, the height position of the drill body 11 is determined by using the second guide mechanism 14. First, the uppermost core drill 11A of the drill body 11 and the second guide mechanism 14 are adjusted so as to be above the slit S.

Next, the core drills 11A to 11C are rotated by driving the drive mechanism 12, and the drill body 11 is advanced toward the concrete wall 20 by the first guide mechanism 13. As a result, the core drills 11A to 11C drill the formation positions of the slits S provided in the concrete wall 20.

FIG. 9A shows that the concrete wall 20 was drilled with independent holes H1 to H3 by the first drilling in the multi-axis core drill device 10. The hole H1 is drilled by the core drill 11A, the hole H2 is drilled by the core drill 11B, and the hole H3 is drilled by the core drill 11C.

Next, the first guide mechanism 13 retracts the drill body 11, and the second guide mechanism 14 moves the drill body 11 vertically downward. The position of the core drill 11A is adjusted so that the destination of the drill body 11 faces the point P1 located between the formed holes H1 and H2.

Since the drill body 11 vertically moves along the alignment direction of the core drills 11A to 11C by the second guide mechanism 14, the core drill 11B inevitably moves to the point P2 located between the holes H2 and the holes H3, and the core drill 11B moves to the point P2 located between the holes H2 and the holes H3. 11C will move to a point P3 located below the hole H3.

FIG. 9B shows a state in which the core drills 11A to 11C are moved to the second drilling position after the first drilling in the multi-axis core drill device 10.
After adjusting the core drills 11A to 11C to positions facing points P1 to P3, the first guide mechanism 13 advances the drill body 11, so that the core drills 11A to 11C pierce the concrete wall 20 and form the concrete wall 20. New holes H4 to H6 are drilled.

FIG. 9C shows a state in which the holes H1 to H6 drilled in the concrete wall 20 are continuous and the drilling close to the shape of the slit S is completed.
Next, the second guide mechanism 14 moves the upper portion of the uppermost core drill 11A of the drill body 11 to a position where the lower portion of the hole H6 drilled by the second drilling slightly overlaps. After adjusting the position, the drill body 11 is advanced by the first guide mechanism 13 to perform the third drilling. After the third drilling. The position of the core drill is aligned between the formed holes, and the drilling is repeated.

By repeatedly drilling the concrete wall 20 using the multi-axis core drill device 10 in this way, continuous holes can be formed, and continuous holes H close to the slit S can be formed. After that, the rectangular slit can be formed by chipping off the burr portion B remaining around the continuous hole H according to the shape of the rectangular slit S.

Further, in many cases, reinforcing bars for reinforcing the concrete wall 20 are embedded inside the concrete wall 20, and when the reinforcing bars are exposed by forming the slit S in the concrete wall 20, the exposed reinforcing bars are cut. By performing the above, a rectangular slit S can be formed.

Japanese Unexamined Patent Publication No. 2000-20827

However, when the rectangular slit S is formed by the multi-axis core drill device 10 as described above, the continuous hole H close to the rectangular slit S can be formed, but the rectangular slit S cannot be formed as it is. That is, in order to form the rectangular slit S, it is necessary to perform a finishing process to remove the burr portion B around the continuous hole H after forming the continuous hole H, and it takes a lot of time and effort to form the slit S. It was hanging.

Specifically, a continuous hole H is formed by drilling a plurality of core drills 11A to 11C included in the multi-axis core drill device 10 a plurality of times while shifting them in the longitudinal direction of the slit S to be formed.

First, in the first drilling, holes H1 to H3 are formed, and a continuous hole is formed by cutting between the formed holes H1 to H3 with a plurality of core drills 11A to 11C provided in the multi-axis core drill device 10. Since the number of times the multi-axis core drill device 10 is moved forward and backward and the distance for moving the multi-axis core drill device 10 in the vertical direction is short, it takes a lot of time to cut the slit portion to be formed.

Further, since the holes formed by the core drills 11A to 11C are circular, the formed continuous holes become circular continuous holes. In such a circular continuous hole H, a straight joint surface such as a rectangular slit S cannot be formed, and unevenness such as a burr portion B shown in FIG. 9C remains.

In order to form the rectangular slit S, it is necessary to remove the remaining burr portion B. The reason why the slit S must be rectangular is that the formed slit S needs to be filled with a slit material having water resistance, dust resistance, soundproofing property, and fire resistance after formation.

For example, if unevenness such as the burr portion B shown in FIG. 9C remains, even if the formed slit S is filled with the slit material, a gap is generated between the slit material and the continuous hole H. It ends up. Since the gap formed between the slit material and the continuous hole H will cause problems such as water leakage later, it is preferable that the joint surface between the slit material and the slit S is in close contact with each other.

Therefore, it is necessary to remove the burr portion B left around the formed continuous hole to form a slit S having a smooth joint surface such as a rectangular slit S. However, by drilling multiple times with a plurality of core drills, a continuous hole blade having a shape similar to that of the slit S is formed, but many burr portions B are left, and the rectangular slit S is removed one by one. It took a lot of time to finish it.

Further, a reinforcing bar for reinforcing the concrete wall 20 is buried inside the concrete wall 20. The width of the slit S to be formed is about 25 mm to 35 mm, and it is very difficult to cut and remove the exposed reinforcing bar in the narrow slit after the slit S is formed. However, since it causes a gap generated when the slit material is filled in the slit S as described above, it is a necessary work to remove the exposed reinforcing bar, although it takes time and effort.

Even if the slit S is formed by using the multi-axis core drill device in this way, it takes a lot of time to chip off the burr portion B and cut and remove the exposed reinforcing bar in the formed slit S. It was.

The present invention has been made in view of these points, and reduces deburring and removal of exposed reinforcing bars in the formed slits when forming slits in concrete structures using a core drill. It is an object of the present invention to provide a method for forming a slit.

In the present invention, in order to solve the above problem, in the method of forming a slit in which a rectangular slit is formed in the wall body, a notch having a depth of the slit formed at the position of both sides of the long side of the slit formed in the wall body is made. A step of making a hole, a step of drilling at a slit depth between the cuts with a core drill at a predetermined interval, and a step of connecting the cut and the cut with a drill hole, and the step of the cut. Provided is a method for forming a slit, which comprises a step of removing a wall body left at a predetermined interval between them.

As a result, a notch having the depth of the slit formed at the position of both sides of the long side of the slit formed on the wall body is made, and a core drill is used to drill a hole at the depth of the slit while leaving a predetermined interval. The cut and the cut are connected by a drill hole, and the wall body left at a predetermined interval between the cuts is removed.

According to the slit forming method of the present invention, a cut having a depth of the slit formed at the position of both sides of the long side of the slit formed in the wall body is made, and a slit is made between the cuts with a core drill at a predetermined interval. Drilling is performed at the depth of, and the cut and the cut are connected by the drill hole, and the wall body left at a predetermined interval between the cuts is removed, so that the reinforcing bar embedded in the wall body is removed. Is cut when making a notch with the depth of the slit formed at the position of both sides of the long side, and the notch and the notch are drilled and connected with a core drill, and the remaining part is removed, so that the slit Since the joint surface of the joint is formed by the notch formed first, it becomes a rectangular and smooth joint surface, so that a rectangular slit can be formed in a short time.

It is a figure which shows the outline of the slit forming method which concerns on this embodiment. It is a figure which shows the process of forming a groove in a wall body. It is a figure which shows the process of cutting the balance with a core drill. It is a figure which shows the process of cutting the balance with a multi-axis core drill. It is a figure which shows the state which formed the groove and the hole in the wall body. It is a figure which shows the detail of one end in the longitudinal direction of the slit to form. It is a figure which shows the state that the joint material was filled in the slit formed in a rectangle. It is a figure which shows the appearance that the seismic slit was formed near the pillar of a building. It is a figure which shows the multi-axis core drill device for forming a slit in a concrete structure. It is a figure which shows the method of forming a slit in a concrete structure using a multi-axis core drill device.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a diagram showing an outline of a slit forming method according to the present embodiment.
As shown in FIG. 1, when forming a rectangular slit S having a slit width of about 25 mm to 35 mm in the wall body 100, first, the wall body 100 is illustrated at the upper end of one side of the rectangular slit S to be formed in the longitudinal direction. The wall saw 200 that is not used is combined, and the driven wall saw 200 is inserted into the wall body 100. The depth at which the wall saw 200 is inserted into the wall body 100 is the depth of the slit S to be formed, and can be arbitrarily set depending on the shape of the wall body 100.

Next, the wall body 100 is cut by moving the wall saw 200 in parallel with the wall surface of the wall body 100 and in the longitudinal direction of the slit S to be formed while driving the wall saw 200. The wall saw 200 is moved as it is, and after the wall saw 200 reaches the lower end of the slit S to be formed, the wall saw 200 is pulled out from the wall body 100. As a result, a groove G1 having a depth of the slit S formed on one side of the slit S formed in the wall body 100 in the longitudinal direction is formed.

Similarly, the wall saw 200 is aligned with the upper end of the other side of the slit S formed with respect to the wall body 100 in the longitudinal direction, and the driven wall saw 200 is inserted into the wall body 100. By reaching the lower end of the slit S formed by the wall saw 200, a groove G2 having a depth of the slit S formed on the other side of the slit S formed in the wall body 100 in the longitudinal direction is formed.

Next, the slit S is formed by removing the remaining portion R left between the groove G1 and the groove G2. When the remaining portion R is removed by cutting with a chipping machine or the like, the slit to be formed is about 25 mm to 35 mm, and it takes time and effort to cut the formed narrow portion with a chipping machine. In addition, there may be a problem that the joint surface of the slit S is scratched by the impact of the chipping machine.
Therefore, in the slit forming method of the present invention, the joint surface of the slit S can be smoothly formed in a short time by using a core drill for cutting the remaining portion R.

As the core drill, a core drill having a diameter having the same width as the slit S to be formed is used. Further, it is desirable to use a core drill having a diameter equal to or larger than the width of the remaining portion R and equal to or smaller than the width of the slit S to be formed.

In the cutting of the remaining portion R, first, the core drill is aligned with the upper end of the slit S to be formed and the center line of the remaining portion R, and the driven core drill is inserted perpendicularly to the wall body 100. After the tip of the core drill reaches the depth of the slit S to be formed, the hole H1 is formed by pulling out the core drill.

Next, the core drill is moved toward the lower portion of the remaining portion R in the longitudinal direction at a predetermined interval, and the remaining portion R is cut again. By doing so, the hole H2 is formed in the remaining portion R. By repeating this, a plurality of holes H can be formed linearly in the remaining portion R. It is not necessary to form the plurality of holes H continuously, and a remaining portion R at a predetermined interval may be left between the holes H1 and the holes H2.

By doing so, at both ends of the slit S in the longitudinal direction, the groove G1 and the groove G2 formed by the wall saw 200 form a smooth flat groove on the joint surface of the slit S, and the groove G1 and the groove G2 are formed. A plurality of holes H are formed in the remaining portion R left between them by a core drill. The space between the hole H1 and the hole H2 is connected to the wall body 100 only at the basement of the joint and can be easily removed. Thereby, the slit S having a smooth joint surface can be formed in a short time.

FIG. 2 is a diagram showing a process of forming a groove in a wall body.
FIG. 2A is a front view showing a step of forming the groove G1 and the groove G2 in the wall body 100.
As shown in FIG. 2A, first, in order to form a slit S having a width of 30 mm in the wall body 100, grooves G1 and G2 are formed on both side surfaces in the longitudinal direction of the slit S.

Grooves G1 and G2 are formed on both side surfaces of the slit S in the longitudinal direction to form the joint surface of the slit S, and are embedded inside the wall body 100 by first cutting the grooves G1 and G2. The reinforcing bars can be cut in advance, and the joint surface of the slit S can be formed into a smooth flat surface.

By cutting the rebar buried in advance, the rebar cutting work in the narrow slit, which has occurred in the conventional construction, is eliminated, and the construction time can be greatly reduced. Further, the roughness of the joint surface caused by chipping off the burr portion B left by the conventional construction can be made smooth and flat by forming the grooves G1 and G2 in advance with the wall saw 200. Can be done. As a result, after the rectangular slit S is formed, there is no gap between the slit material filled in the slit S and the joint surface, and water leakage and sound leakage can be prevented.

The grooves G1 and G2 are first formed so as to be aligned with the upper end of one side of the slit S forming the wall saw 200 in the longitudinal direction. In the wall saw 200, a linear rail guide is installed along the slit S formed in the wall body 100, and the wall saw 200 is connected to the rail guide and moved up and down to match the wall body 100 with the rail guide. Can be cut in a straight line.

After the installation of the rail guide and the rail guide on the wall body 100 is completed, the wall saw 200 is then driven and inserted into the wall surface of the wall body 100 at the upper end position of one side in the longitudinal direction of the slit S to be formed.

While driving the wall saw 200, the wall body 100 is cut by moving it parallel to the wall surface of the wall body 100 and in the longitudinal direction of the slit S to be formed. The wall saw 200 is moved as it is, and after the wall saw 200 reaches the lower end of the slit S to be formed, the wall saw is pulled out from the wall body 100.

As a result, a groove G1 having a blade thickness of the wall saw 200 is formed on one side of the slit S formed in the wall body 100 in the longitudinal direction. Further, the reinforcing bar embedded in the slit forming position inside the wall body 100 is cut in this step. The blade thickness of the wall saw 200 may be arbitrary, but a wall saw 200 having a blade thickness of 3 mm will be described below.

Next, the wall saw 200 is aligned with the upper end of the other side of the slit S formed with respect to the wall body 100 in the longitudinal direction, and the driven wall saw 200 is inserted into the wall body 100. By reaching the lower end of the slit S formed by the wall saw 200, a groove G2 having a width of 3 mm is formed on the other side of the slit S formed in the wall body 100 in the longitudinal direction.

As a result, a groove G1 having a blade thickness of 3 mm is formed from one side of the slit S having a width of 30 mm in the longitudinal direction, and a groove G2 having a blade thickness of 3 mm is formed from the other side. The remaining portion R will be left.

FIG. 2B is a cross-sectional view showing a step of forming the groove G1 and the groove G2 in the wall body 100.
As shown in FIG. 2B, a wall saw 200 is used to form a groove G1 and a groove G2 in the wall body 100.

The depth of the groove G1 and the groove G2 can be arbitrarily set by the depth at which the wall saw 200 is inserted, but the wall body 100 is not completely cut and penetrated indoors and outdoors. In an existing building, a slit S is formed in the wall body 100 by the slit forming method of the present invention from the outside so as not to affect the lives of residents and the like, and a part of the indoor side of the wall body 100. It is also possible to cut while leaving.

By cutting while leaving a part of the indoor side of the wall body 100 in this way, it is possible to eliminate the movement of residents during the construction period and the influence on the interior. In addition, since shavings generated during cutting are also generated only on the outside of the building, the work can be performed without polluting the interior.

FIG. 3 is a diagram showing a process of cutting the remaining portion with a core drill.
As shown in FIG. 3, a core drill is used to cut the remaining portion R with the core drill 300.
It is preferable to use a blade having a diameter smaller than the width of the slit S to be formed and larger than the width of the remaining portion R.

By cutting the core drill 300 having the blade having the above diameter along the center line in the longitudinal direction of the slit S to be formed, the blade of the core drill 300 is formed over the grooves G1 and the groove G2, and the joint surface of the slit S is formed. Does not hurt. That is, the remaining portion R can be cut without damaging the joint surface formed by the core drill 300.

Specifically, the slit S to be formed is 30 mm, and the grooves G1 and the grooves G2 of 3 mm are formed from both sides along the longitudinal direction, so that the remaining portion R is 24 mm. Therefore, it is preferable to use a diameter of the blade of the core drill 300 of 24 mm or more and less than 30 mm. For example, by cutting the remaining portion R having a width of 24 mm using the blade of a 27 mm core drill 300, the groove G1 and the groove G2 can be connected by the hole H1 without damaging the joint surface formed by the groove G1 and the groove G2. it can.

In order to cut the remaining portion R, first, the tip of the blade of the core drill 300 is installed so as to be aligned with the upper end of the slit S to be formed and the center line in the longitudinal direction of the formed remaining portion R. Next, the core drill 300 is driven to advance the core drill 300 perpendicularly to the wall body 100, and the blade of the core drill 300 is inserted into the wall body 100.

When the cutting edge of the core drill 300 reaches the depth of the slit S to be formed, the core drill 300 is retracted and the core drill 300 is pulled out from the wall body 100. As a result, the hole H1 is formed in the wall body 100.

Since the remaining portion R is cut from the center of the remaining portion R having a width of 24 mm with the core drill 300 having a diameter of 27 mm, the blade of the core drill 300 cuts the remaining portion R so as to protrude from the remaining portion R by 1.5 mm. That is, when the hole H1 is formed in the remaining portion R, the groove G1 and the groove G2 are connected by the hole H1. However, since the groove G1 and the groove G2 are formed with a width of 30 mm, the blade of the core drill 300 does not cut outside the groove G1 and the groove G2. That is, the joint surface of the formed slit S is not damaged.

Next, the core drill 300 is moved toward the lower portion of the remaining portion R in the longitudinal direction at a predetermined interval, and the remaining portion R is cut again. By doing so, the hole H2 is formed in the remaining portion R. It is not necessary to connect and cut the hole H1 and the hole H2, and it is preferable to cut the hole H1 and the hole H2 with a predetermined interval so that the remaining portion R of the predetermined interval is left.

By cutting with the core drill 300 leaving the remaining portion R at a predetermined interval in this way, the number of times the core drill 300 is moved forward and backward can be reduced, and the distance from one cutting to the next cutting position of the core drill 300 can be increased. The cutting time can be shortened. Further, the remaining portion R left at a predetermined interval can be easily removed by naturally falling due to the vibration of the core drill 300 or by prying it with an elongated rod-shaped object such as a bar. Details will be described later.

FIG. 4 is a diagram showing a process of cutting the remaining portion with a multi-axis core drill.
As shown in the figure, a multi-axis core drill 310 having a plurality of blades is used to cut the remaining portion R.

The cutting method is the same as that of the core drill 300 having one blade in FIG. 3, but in the case of the multi-axis core drill 310 having a plurality of blades, since the core drill 310 is provided with a plurality of blades, the core drill 310 is a wall body. A plurality of holes can be drilled by advancing back and forth once with respect to 100.

In FIG. 4, since the multi-axis core drill 310 having three blades is used for cutting, three holes H1 to H3 can be drilled only by moving the core drill 310 back and forth once. That is, it is possible to make a hole three times faster than in FIG.

Further, in the case of the conventional slit forming method, the slit S is cut using a multi-axis core drill 310, but since it is necessary to further cut between the holes H1 and the holes H2, the cutting speed is the method shown in FIG. It requires twice as much as compared to. However, in the construction method of the present invention, since the slit S can be formed even if the remaining portion R is left at a predetermined interval, the distance from one cutting to the next cutting position of the core drill 300 can be increased, so that the construction time is greatly increased. Can be shortened to.

FIG. 5 is a diagram showing a state in which grooves and holes are formed in the wall body.
As shown in FIG. 5, in the wall body 100, grooves G1 and grooves G2 are formed on both sides in the longitudinal direction of the slit S to be formed, and the remaining portion R left between the grooves G1 and the groove G2 is a core drill 300. Alternatively, a multi-axis core drill 310 having a plurality of blades is used to make a plurality of holes H at predetermined intervals.

Between the plurality of holes Hn and the holes Hn, the remaining remaining portions R1, R2, R3 ... And the plurality of divided remaining portions Rn are left. The split remaining portion is connected to the wall body 100 only by the joint portion K which is the basement of the joint.

When a screwdriver, a bar, or the like is inserted into the hole H in the state of FIG. 5 and a force is applied to the split remaining portion Rn, the joint portion K is easily broken and the split remaining portion Rn can be removed from the wall body 100. Alternatively, it can be naturally separated from the wall body 100 by vibration generated when the remaining portion R is being cut by the core drill 300. By removing the peeled split balance Rn, a rectangular slit S can be easily formed.

FIG. 6 is a diagram showing details of one end of the slit to be formed in the longitudinal direction.
FIG. 6A shows an end portion when cutting is performed by aligning the outer circumference of the blade of the core drill 300 with the upper end of the groove G1 and the groove G2.

As shown in FIG. 6 (A), the outer circumference of the blade of the core drill 300 is aligned with the upper end of the groove G1 and the groove G2, and the burr portion B is formed at the joint between the hole H1 and the groove G1 and the groove G2. It is formed. A rectangular slit S can be formed simply by removing the burr portion B.

FIG. 6B shows an end portion when cutting is performed by matching the diameter of the blade of the core drill 300 with the joint surface of the groove G1 and the groove G2.
As shown in FIG. 6B, a slit S having an annular end can be formed by cutting the core drill 300 with the diameter of the blade of the core drill 300 aligned with the joint surface of the groove G1 and the groove G2. When cutting in this way, the burr portion B does not occur, so that the construction time can be shortened and the joint surface can be finished smoothly.

FIG. 7 is a diagram showing a state in which a joint material is filled in a slit formed in a rectangular shape.
As shown in FIG. 7, the formed slit S is filled with the joint agent 110. As a result, it is possible to provide water resistance, dust resistance, soundproofing property, fire resistance and the like equivalent to those of the wall body 100. Further, since the formed slit S has a joint surface formed by the wall saw 200, the surface is smooth and the burr portion B having a complicated shape does not occur.

That is, since the filled joint agent 110 and the joint surface having a smooth surface are in close contact with each other and no gap is generated, the adhesiveness is improved as compared with the conventional joint agent 110 filled with the joint surface from which the burr portion B has been chipped. be able to. That is, water resistance, dust resistance, soundproofing property, and fire resistance can be improved.

When cutting the wall body 100 with the wall saw 200 or the core drill 300, it is preferable to connect a water hose to the wall saw 200 or the core drill 300 and perform the cutting while sprinkling water. As a result, it is possible to eliminate the scattering of dust generated during cutting.

1, 2 Pillars 3, 100 Wall body 3a Waist wall 3b Hanging wall 4 Opening 5 Floor surface 6 Ceiling surface 7, 8 Seismic slit 10 Multi-axis core drill device 11 Drill body 11A, 11B, 11C Core drill 12 Drive mechanism 13 First guide Mechanism 14 Second guide mechanism 20 Concrete wall 110 Joint agent 200 Wall saw 300 Core drill 310 Multi-axis core drill B Burr part G1, G2 Groove H, H1, H2, H3, H4, H5, H6, Hn hole K Joint part L1, L2 section P1, P2, P3 point R Remaining part R1, R2, R3, Rn Divided remaining part S Slit

Claims (8)

In the method of forming a slit that forms a rectangular slit in the wall body,
The process of making a notch with the depth of the slit formed at the position of both sides of the long side of the slit formed on the wall body, and
A process of drilling between the cuts at the depth of the slit with a core drill and connecting the cuts and the cuts with the drilled holes at a predetermined interval.
A step of removing the wall body left at a predetermined interval between the cuts, and
A method for forming a slit, which comprises. The core drill
The method for forming a slit according to claim 1, wherein the core drill is a multi-axis core drill provided with a plurality of drilling blades. The plurality of drilling blades
The method for forming slits according to claim 2, wherein the slits are provided so as to be aligned in a straight line with a predetermined interval. The diameter of the core drill is
The method for forming a slit according to claim 1, wherein the width is greater than or equal to the width between the cuts and less than the width of the slit to be formed. The notch is
The method for forming a slit according to claim 1, wherein the wall saw is inserted into the wall body and moved in the longitudinal direction of the slit to be formed. The depth of the slit is
The method for forming a slit according to claim 1, wherein the thickness of the wall body is made shallower than the thickness of the wall body to form a residual wall thickness in the slit portion. The walls left at predetermined intervals between the cuts
The method for forming a slit according to claim 1, wherein the slit is peeled off from the wall by prying with a crowbar. The walls left at predetermined intervals between the cuts
The method for forming a slit according to claim 1, wherein the core drill is peeled off from the wall body by vibration caused by drilling.

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