JP3388295B2 - How to make grooves in concrete - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method for forming grooves on the surface of concrete.

[0002]

2. Description of the Related Art Conventionally, when a groove is provided on the surface of concrete, if the depth of the groove is shallow and the groove length is short, it is necessary to manually grind it with a chisel by using human power. Although it may be provided, it has generally been difficult.

Among heat-resistant concrete and furnace material manufacturers,
By heating the narrow groove rapidly with a heating element installed in the narrow groove provided on the surface of the concrete and causing explosion in the concrete around the narrow groove, the concrete around the narrow groove is repelled. It has been known that a groove-shaped dent that widens due to the expansion is used, but it is not popular because it is extremely dangerous to use the explosion phenomenon for setting a groove on the surface of concrete.

[0004]

[Problems to be solved] To easily and safely form a groove on the surface of concrete.

[0005]

Means for Solving the Problems A concrete portion to be provided with a groove is heated to gradually raise the temperature to 300 ° C. or more, and free water and crystal water in the portion are removed to weaken the portion. Vibration is applied to fragile concrete to pulverize mortar, and concrete aggregate such as crushed stone
On the surface of concrete by removing mortar and mortar
Provide a groove .

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION In the temperature raising method of the present invention for gradually heating the surface portion and the lower portion of concrete to be provided with grooves to raise the temperature to 300 ° C. or higher, a heating element is provided on the surface portion. There are two methods of installing in the narrow groove or along the surface portion.

In the former temperature raising method, the closer the 300 ° C. position on the surface of the concrete is to the entrance of the narrow groove, the narrower the fragile range of the concrete surface layer becomes, so that it is difficult to remove the fragile portion below. Become. When continuous heating at a temperature of 300 ° C. for 60 minutes on the concrete surface exceeds approximately 30 mm from the inlet of the narrow groove, the heating capacity and the superheating rate are large, which may cause explosion, which is very dangerous. Therefore, it is preferable that the position of 300 ° C. on the concrete surface be within a limit of about 30 mm from the narrow groove entrance.

In the latter temperature raising method, as the position of 300 ° C. on the concrete surface is closer to the heating element, the fragile depth of the concrete surface layer becomes shallower, so that the fragile range of the concrete becomes narrower. The portion directly below the surface portion within a range approximately 20 mm to 30 mm away from the heating element is weakened.
In this way, the weakened width is at least about 40 m.
Since there is m, the crushed stone can be taken out, and the trench can be dug. When the weakened width exceeds approximately 60 mm, the heating capacity and the superheat rate are large, and thus explosion may occur, which is very dangerous. Therefore, it is preferable that the position of 300 ° C. on the concrete surface is within a limit of about 30 mm from the heating element.

Here, the position of the groove to which the "method of providing a groove in concrete" in the present invention is applied is the floor surface and the side surface of the concrete, and the direction of the groove with respect to the side surface is the vertical direction or the horizontal direction. , Diagonally. Heating of the groove position in the case have provided grooves in the vertical walls of concrete, placed along the heating element to the vertical surface, the heating element support device heating element along a groove (structure, implementing the method used Example 10 , Which will be described later in step 1). Then, when deepening the above-mentioned groove, heat is generated.
A heating element support device for placing the heating element along the bottom of the groove.
(The structure and method of use are described later in Example 10.
It ) And fix it.

Here, concrete is a mixture of aggregate, sand, cement, and water that is solidified by the hydration reaction of alumina, which is a cement component. It contains water and reacted water, so-called crystal water.

Since mortar is a mixture of cement water and solidified, concrete is a mixture of aggregate, sand and mortar.

Therefore, when the mortar in concrete is heated and heated to 100 ° C., free water becomes steam, and when heated to around 300 ° C., crystal water is decomposed and becomes steam. Since these steams are heated in a sealed state, they become high-pressure steams and expand, causing minute cracks in the mortar, and then released from the concrete surface through the cracks. Mortar contains free water and water of crystallization uniformly, so if the temperature is raised to 300 ° C. or higher, fine cracks will be uniformly present and become uniformly brittle. Therefore, concrete heated to 300 ° C. or higher is brittle because the mortar, which is its component, is weakened.

Disassembling a fragile part with a light-weight type crusher that repeatedly crushes concrete or rock by repeatedly applying a shock to the weight with compressed air, hydraulic pressure or electricity causes thermal expansion because the repeated shock is too strong. It is not preferable because it may cause the continuous cracks to grow and damage the sound part of the concrete. The fragile portion can be cut by an operator with a chisel, but the cutting work is troublesome. Therefore, we have found a method for easily scraping off the fragile portion without using the crusher described above, and the scraping method will be described next.

If the blade tip of a tool (hereinafter referred to as "ultrasonic engraving knife") for cutting an object with the blade tip vibrated by ultrasonic waves is continuously pushed on the fragile portion of the mortar, the blade tip is pressed. The fragile portion of the mortar can be scraped off using an ultrasonic engraving knife, because the fragile portion is stabbed while being powdered by vibrating.

Further, a tool for pressing the tips of a plurality of hard wires vibrated by compressed air, hydraulic pressure, or electricity against the deposits on the surface of the object to remove the deposits (hereinafter referred to as "vibrating wire chisel"). if you continue pressing the tip of the wire to the fragile portion of the mortar, the distal end portion of the wire, while powdering the parts are only with press me more than the excitation, because the holes in the fragile portion, mortar of vulnerable parts can be scraped off with a vibration-type wire-like chisel.

Furthermore, a tool (hereinafter referred to as "vibrating spatula chisel") for pressing the blade edge of a spatula chisel vibrated by compressed air, hydraulic pressure or electricity against the deposit on the object surface to remove the deposit. if you continue pressing the cutting vulnerable portion of the mortar, its cutting edge, while powdering me than the vibrating portions are pressed, so stick to the fragile portion, fragile portion of the mortar using a vibration-type paddle chisel Can be scraped off.

Therefore, the mortar of the weakened concrete portion is subjected to ultrasonic engraving knife, vibrating wire-like chisel or vibrating spatula-like chisel (hereinafter referred to as "exciting cutter").
Can be pulverized to scoop out the aggregate. Therefore, it is possible to form a groove in the concrete by removing the aggregated material, the powdered mortar, and the sand contained in the mortar. The minimum width of the weakened portion is preferably 30 mm to 40 mm, so that the aggregate is easy to remove, and is preferably at least about 50 mm.

The width of the groove to be formed on the surface of concrete is 5
When it exceeds 0 mm, it is approximately 50 mm within the target groove width.
Or, the narrow grooves are arranged in parallel at intervals of about 100 mm, the above-mentioned heating elements are installed in the narrow grooves, and the heating elements in each row are heated to weaken the concrete around the heating elements. In each row,
Because so that the above-mentioned widening grooves in parallel by removing the fragile portion, it comes out to provide a width of the groove to said purpose. Therefore, the surface of the concrete can be widely stripped by increasing the number of the fine grooves.

[0019] surface position away substantially 25mm from the thin groove inlet stops heating when it is 300 ° C., in the case were <br/> remove the fragile portion, when the inter-thin groove exceeds 50mm, the expansion
Vertical walls will be generated between the width grooves. The vertical wall is
Strongly than the lower, because those are fragile downward, hitting the upper with a hammer, can be removed by folding at the lower position.

A deep groove can be formed by repeating the operation of newly heating the bottom of the groove provided in the concrete to weaken it and removing the weakened portion.

If the repetition is continued, the through groove will be finally formed in the concrete. When the reinforcing bar is exposed when removing the fragile portion, the groove has a width that allows the gas cutting torch to sufficiently enter, and therefore the torch may be used for cutting and removal.

A heating element is placed at the bottom of the groove for absorbing thermal expansion existing on the surface of concrete or for a groove provided at the time of construction to prevent the growth of surface cracks. Then, the inner wall of the groove is heated by the heating element to weaken the periphery of the bottom portion, and then the weakened portion is removed, whereby the widened groove can be provided on the surface.

In the groove provided on the concrete surface,
By installing buried objects such as water pipes, gas pipes and electric wires, and a template for restoring the groove that was originally present, by filling the space of the groove with mortar or concrete and solidifying It is possible to bury buried objects such as water pipes and electric wires and restore the original surface shape.

The fine grooves provided on the sound concrete surface are provided on the surface of the concrete by using a floor cutting machine for providing a cutting groove on the floor surface with a rotary blade. The fine groove provided on the bottom of the above-mentioned groove constructed by weakening and removing the mortar constituting the concrete is also the cutting groove of the cutting trace by the floor surface cutting machine.

Further, the mortar in the vicinity of the outer 300 ° C. isotherm, free water and high-pressure steam of, and partially with water of crystallization is high-pressure steam of, brittle but not enough inward to generate fine cracks Therefore, it is possible to remove the crushed stone, which is the aggregate of concrete, while pulverizing the mortar using the vibration cutting machine. Therefore, by cutting the side surface of the fragile portion with a vibration cutting machine to form a vertical wall, a groove having a good appearance can be formed.

According to the knowledge, even if the temperature inside the concrete 25 mm away from the heating element is continuously raised at a rate of about 7.5 ° C. per minute for 60 minutes,
No explosion occurred. It was also found that, if the above-mentioned continuous heating is continued for more than 60 minutes, hair cracks generated by thermal expansion grow greatly and extend to the back side of the concrete. Therefore, the temperature rise to weaken the concrete, inside the concrete 25mm away from the heating element,
It is preferable to continuously raise the temperature at a rate of about 7.5 ° C. per minute for up to 60 minutes. The heating capacity of the heating element in this case is 600 W per 300 mm of heating element length. If the heating rate is slow, it will take a lot of time to weaken the concrete.

The method of forming the widening groove or the excavation groove in the concrete has been described above.
Even when the crushed stone and sand are not contained, that is, when the groove is formed in the mortar, the same method as the above method can be used.

[0028]

Example 1 FIG. 1 (a) shows an example of a method of providing a groove in concrete according to the present invention, in which a heating element 7 is installed in a narrow groove 5 provided in a surface 10 of concrete 1. , The heating element 7 is made to generate heat, and about 25
The points A and B, which are the positions of the surface 10 separated by mm, are 300
It is sectional drawing showing the situation when it heated up to ° C. Figure 1
In (a), 1 is concrete, 2 is aggregate, 3 is sand, 4 is mortar, 5 is a narrow groove, 7 is a heating element, 8 is a fragile portion of mortar, and 9 is mortar. The sound part, 10 is the surface of the concrete, and 11 is the isotherm where the internal temperature of the concrete is 300 ° C. The isotherm 11 is the heating element 7
Was generated by heating 600 W per 300 mm length for 60 minutes.

The aggregate 2 is crushed stone, and the aggregate hanging on the isotherm 11 at 300 ° C. is crushed stones 12a, 12b, 12
The aggregate within the isotherm 11 is called crushed stone 12d, 12
The aggregate outside the isotherm 11 is crushed stone 12
g, 12h, 12i.

The shaded portion in the figure represents the fragile portion 8 of the concrete 1 because its outer edge is the isotherm 11 of 300 ° C., and the width of the uppermost portion of the fragile portion 8, that is, the fragile portion on the surface 10 of the concrete 1 is indicated. The width of the part is A and B, which are 300 ° C.
It is between the points and is approximately 50 mm. In the above-mentioned situation, that is, A, which is the position of the surface 10 approximately 25 mm away from the entrance of the narrow groove 5.
When the points B and B are heated to 300 ° C., heating by the heating element 7 is stopped. After the heating is stopped, the widening groove 14 is provided by pulverizing the mortar located in the fragile portion 8 of the concrete 1 with a vibrating cutting machine, removing crushed stone, sand, and pulverized mortar, and digging down. it can.

Inside the isothermal line 11, the temperature is higher as it is closer to the heating element 7, and on the outside, the temperature is lower as it is farther from the heating element 7. Also, the isotherm at 300 ° C 11
Inside, free water and crystallization water in mortar become high-pressure steam to make innumerable minute cracks, and fine cavities occur in the parts where the free water and crystallization water were located. Are weakened due to

Therefore, the portions AB on the surface 10 are weakened, and the distance between the weakened portions AB is about 50 mm. However, the crushed stone 12d, which is an aggregate located within the width of the fragile portion 8,
12e and 12f usually have a maximum size of 30 mm to 4
It is 0 mm. Therefore, if the mortar in the fragile portion 8 is pulverized by the vibration cutting machine, the crushed stones 12d, 12e, 12f will be AB.
It can be removed from the space and removed.

Therefore, the widening groove 14 can be provided by pulverizing the mortar of the fragile portion 8 with a vibrating cutting machine to remove the loose crushed stones 12d, 12e, 12f, sand and powdered mortar.

Then, the crushed stones 12a, 12b, 12c protruding on the inner surface of the widening groove 14 are tapped and pulled out. Thus, the widened groove 14 without crushed stones protruding inward can be provided on the surface of the concrete 1.

A method of tapping and extracting the crushed stones 12a, 12b, 12c protruding from the inner surface of the widening groove 14 will be described below.

Crushed stones 12a, 12b, 12 in FIG. 1 (a)
c is a crushed stone at a position protruding from the isotherm 11 of 300 ° C. to the low temperature side. Here, the mortar near the outside of the isotherm 11 contains water of crystallization and is in the process of absorbing the latent heat for decomposing the water of crystallization and the heat of vaporization for turning into water vapor. The temperature is slow.

However, the crushed stones 12a, 12b, and 12c that hang on the isotherm of 300 ° C. are less mortar 4 than the mortar 4 whose thermal conductivity is weakened due to the fact that the side close to the heating element 7 is exposed to high temperature. good. For this purpose, crushed stones 12a, 12
The positions of the 300 ° C. isotherms in b and 12c project from the position of the 300 ° C. isotherm 11 of the mortar to the low temperature side.

Therefore, the mortar 13 adhering to the crushed stones inside the 300 ° C. isotherm 11 projecting to the low temperature side of the crushed stones 12a, 12b, 12c is decomposed by the crystal water to become water vapor and becomes brittle. There is. Therefore, the crushed stones 12a, 12b, 12c protruding into the widening groove 14 should be tapped to form a gap in the mortar 13 adhered before heating, that is, the so-called weakened mortar 4 after heating, and pull out. You can

If the protrusion cannot be extracted even if it is tapped, the protruding portion can be burned with a gas burner to sufficiently weaken the adhered mortar 13 and then tapped again for extraction. In the operation of baking the protruding portion with a gas burner, crystal water of the mortar around the protruding portion is reduced, so that explosion does not occur if heating is performed for a short time. Thus, as shown in FIG. 2, the widened groove 14 can be provided on the surface 10 of the concrete 1.

The initial fine grooves 5 provided on the surface of the concrete are used as cutting grooves by a diamond blade of a floor cutting machine.

The heating element has a size that fits in the narrow groove 5.
In addition, Nichrome wire or gas combustion
Any heating gas burner may be used. Experience has shown that concrete does not explode at a heating rate of approximately 7.5 ° C. per minute, so that the heating time for the narrow groove is 60.
It only takes a minute. Therefore, how to provide a groove in the concrete of the present invention, as possible out for practical use. Further, the widened groove will look good if its side surface is ground by a vibration cutting machine to finish it into a vertical wall.

[0042]

[Embodiment 2] FIG. 3 shows that a narrow groove 19 is provided in the bottom portion 15 of the widening groove 14 provided by the method of providing a groove in the concrete of the present invention provided on the surface of the concrete, and the heating element 22 is provided in the narrow groove 19. Then, the heating element 22 is made to generate heat, and the narrow groove 1
9 is a cross-sectional view showing a situation where points A and B, which are located approximately 25 mm away from the inlet of 9, are heated to 300 ° C. FIG.

The fine groove 19 provided in the bottom portion 15 is dug to a depth at which it can be cut by an oscillating cutting machine, and the side wall and the groove bottom of the groove are heated by the heating element 22 installed at the groove bottom. In the above situation, that is, when the points A and B, which are located approximately 25 mm away from the entrance of the narrow groove 19, are heated to 300 ° C., heating by the heating element is stopped.

After the heating is stopped, the mortar of the fragile portion 21 is pulverized by a vibration cutting machine to remove crushed stone, sand and pulverized mortar, and a deep widening groove 17 at the bottom is provided. The crushed stones 12j and the like protruding to the deepened bottom can be removed by hitting and pulling them out as described above. As described above, the crushed stone that cannot be pulled out can be pulled out by firing it with a gas burner to sufficiently weaken the adhered mortar 18 and then tapping it again. When the reinforcing bar is exposed, the mortar around the reinforcing bar is disassembled and removed by a vibrating cutting machine, and then the exposed reinforcing bar is gas-cut and removed, so that the deep wide groove 17 at the bottom can be provided.

[0045]

Third Embodiment It is possible to provide the through groove 23 in the concrete 1 by repeating the operation of deepening the bottom of the widening groove described above.

[0046]

[Embodiment 4] The existing concrete can be separated by performing the above-mentioned installation work of the through groove 23 at the existing concrete cutting-out position. Further, the separated concrete can be easily carried out by providing the through groove 23 at an appropriate position and chopping it into fine pieces.

[0047]

[Embodiment 5] When it is desired to cut out the holes 24 in the concrete, if the above-mentioned through groove 23 is installed along the inner circumference of the planned position of the holes, the holes 24 can be easily cut out in the concrete. it can.

[0048]

Example 6 FIG. 4A shows the surface 10 of the concrete 1.
, L = 75 mm between the narrow grooves 25a and 25b,
L = 75 mm between b and 25c, L = 50 mm between narrow grooves 25c and 25d, L = 50 m between narrow grooves 25d and 25e
At the position of m, the narrow grooves 25a, 25b, 25c, 25
d and 25e are provided, and the heating is stopped when the surface position at a distance of approximately 25 mm (eg, E, F, G in the drawing) from each narrow groove inlet reaches 300 ° C, and then the fragile parts on both sides of each narrow groove It is sectional drawing which removed.

Since the fragile portions on both sides of each narrow groove are removed,
As shown in FIG. 4A, the widening groove 26 is located at the position where the narrow groove 25a was located, the widening groove 27 is located at the position where the narrow groove 25b was located, and the narrow groove 25c, the narrow groove 25d, and the narrow groove 25d. Groove 25
The wide groove 28 is formed in the portion where the e was located, and the narrow groove 25a
And a narrow groove 25b between the narrow groove 25b (= K1), and between the narrow groove 25b and 25c about 25mm
The weakened insufficient portion of the width (= K2) remains in the shape of a wall. The widened groove 28 is formed because the entire area between the narrow grooves at intervals of 50 mm is weakened, so that it can be completely dismantled and removed, and the wall-like weakened insufficient portions of K1 = approximately 25 mm and K2 = approximately 25 mm are spaced by 75 mm. Both ends, that is, the adjoining area of each narrow groove of about 25 mm is weakened and removed.

K1 = approximately 25 mm and K2 = approximately 25 mm
Since the lower part of the wall-like weakened part is considerably weakened, it is removed by hitting the upper part with a hammer and folding it in the lower position. Thus, the surface of the concrete 1 is, as shown in FIG. 4B, a groove having a very wide width, that is, a wide stripping portion 2
9 can be provided.

[0051]

[Embodiment 7] In FIG. 5, a heating element 30 linearly placed on the surface 10 of concrete 1 is covered with a heat shield cover 31 to generate heat, and the temperature is about 25 m from the surface point C under the center of the heating element 30.
The points A and B, which are the positions of the surface 10 separated by m, are 300 ° C.
FIG. 4 is a cross-sectional view showing the situation when the temperature is raised to 0. The shaded area in the figure is an isotherm 32 of 300 ° C. at the outer edge,
The fragile portion 33 of the concrete 1 is represented, and the width of the uppermost portion of the fragile portion 33, that is, the width of the fragile portion on the surface 10 of the concrete 1 is between the points A and B at 300 ° C. and is about 50 mm. A heat insulating material is attached to the inner surface of the heat shield cover 31 so that the radiant heat from the heating element 30 is not released to the atmosphere. The isotherm 32 shows that the heating element 30 is
It was generated by heating 600 W per 300 mm length for 60 minutes.

In the above situation, that is, from the heating element 30 to approximately 25
When the temperature of the surface 10 at a distance of mm increases to 300 ° C., heating by the heating element is stopped.

After the heating is stopped, the mortar located in the fragile portion 33 of the concrete 1 is pulverized by a vibrating cutting machine to remove crushed stones, sand, and pulverized mortar, and the digging groove 35 is formed by digging. Can be provided. Excavation ditch 3
The crushed stones 34 protruding to the bottom of the plate 5 can be removed by hitting and pulling them out as described above.
The crushed stone 34 that cannot be pulled out can be removed by burning it with a gas burner and then tapping it again as described above.

The width of the fragile portion on the surface 10 is about 50.
Since the crushed stone 30, which is an aggregate located within the width of the fragile portion, usually has a maximum size of 30 mm to 40 mm, the mortar can be removed by pulverizing the mortar with a vibration cutting machine. .

[0055]

[Embodiment 8] FIG. 6 shows an excavation groove 3 provided in concrete 1.
The heating element 36 placed on the bottom surface of No. 5 is covered with a heat shield cover 31 to generate heat, and points A and B, which are positions of the bottom of the excavation groove 35 approximately 25 mm away from the surface position C under the center of the heating element 36. FIG. 4 is a cross-sectional view showing the situation when the temperature is increased to 300 ° C. The shaded portion in the figure represents the weakened portion 38 within the 300 ° C. isotherm 37 of the concrete 1. In the above-described situation, that is, when the temperature rises to 300 ° C. at a position approximately 25 mm away from the heating element 36, heating by the heating element is stopped.

After the heating was stopped, the mortar in the fragile portion 38 of the concrete 1 was pulverized by a vibrating cutting machine and the concrete was crushed.
By removing crushed stone, sand, and powdered mortar, which are aggregates of REIT, and digging down, it is possible to provide the digging groove 40 in which the digging groove 35 is deepened. The crushed stone 39 protruding to the bottom of the excavation groove 40 can be removed by hitting and pulling it out as described above. The crushed stone that cannot be pulled out can be removed by burning with a gas burner and then tapping again as described above. When the reinforcing bar is exposed, the mortar around the reinforcing bar is removed by a vibrating cutting machine, and then the exposed reinforcing bar is gas-cut to remove the digging groove 40 having a deep bottom.

[0057]

[Ninth Embodiment] In concrete , the excavation groove of the eighth embodiment is provided on the bottom surface of the excavation groove provided in the manner of making the excavation groove 35 deep.
By repeating the work of making the excavation groove deeper, it is possible to provide the through-groove, so that the entire width of the through-groove can be provided.
It is possible to cut by providing a through groove over the entire length .

[0058]

[Embodiment 10] FIG. 7 shows an inner bottom 46 of an excavation groove 44 provided on a surface 42 of a vertical wall 41 of concrete 1 in order to further excavate it deeper like the aforementioned excavation groove 40. FIG. 9 is a partial cross-sectional perspective view showing a state in which the heating element 48 is installed by the heating element support device 47. In the figure, 47 is a heating element support device, 48 is a heating element, 54 is an adhesive tape, and the heating element support device 47 has a stepped projection plate 53 having a support cylinder 51 formed of an insulator in the center. Flange 5
It is supported by 2a and 52b.

The heating element 48 is in the shape of [and both ends thereof are engaging shafts 49a and 49b, and the engaging shafts 49a and 49b are inserted into and supported by the support cylinder 51 of the heating element support device 47. The two heating element supporting devices 47 supporting the heating element 48 are provided with stepped flanges 52a, 52 at both ends thereof so that the heating element 48 is installed along the center line of the excavation groove 44.
After fixing b to the vertical wall 41 of the concrete 1 with the adhesive tape 54, the heating element 48 is pushed into the bottom 46 of the excavation groove 44 and supported. Instead of using the adhesive tape 54, the contact surfaces of the stepped flanges 52a and 52b may be fixed to the concrete surface 42 with double-sided adhesive tape. Thus, the heating element 48 can be installed on the bottom 46 of the vertical excavation groove 44. And the heat shield cover 3
1 is fixed between the heating element support devices 47 with the adhesive tape 54 to cover the excavation groove 44.

Then, the heating by the heating element 48 or
After weakening the bottom 46 of the trench 44 by gas combustion heating ,
The bottom 4 is removed in the manner that the heating element support device 47 and the heating element 48 are removed to remove the fragile portion 38 under the excavation groove 35.
The fragile part at the back of 6 is removed. Thus, concrete 1
A deep excavation groove 45 may be provided in the surface 42 of the vertical wall 41 of the.

The heating of the vertical wall 41 for excavating the original excavation groove 44 is performed by the above-mentioned two heating element support devices 4
7 and the heating element 48. The protruding plate 53 that constitutes the support base 50 of the heating element support device 47 and the surface 4 of the vertical wall 41.
Between 2 pre-aft in the step of heating element 48 fits,
The heating element 48 two heating body support device 47 that supports the, as the heating element 48 is disposed on the surface 42 along the center line of the excavation 44, via a flange 52a, 52b at both ends
Then, it is fixed to the vertical wall 41 of the concrete 1 with the adhesive tape 54. Then, over the heating element 48 in the heat shielding cover 31, after fixing the two heating body support devices 47 with adhesive tape 54 to the vertical wall 41, electric heating some have with the heating element 48
Heats the vertical wall 41 by gas combustion heating . Therefore, after heating as described above, the adhesive tape 54 is peeled off, the heat shield cover 31, the heating element support device 47, and the heating element 48 are removed, and then the portion weakened by heating is removed to remove the vertical wall 41. A trench 44 can be provided in the.

Further, in the present embodiment, the excavation groove 44 is vertically provided on the vertical wall 41, but the excavation groove 44 is provided by installing the heating element 48 sideways by the heating element support device 47.
Can be installed sideways. And the sideways digging groove 4
By installing the heating element 48 with the heating element support device 47 in FIG. 4, the vertical wall 41 can be provided with the deep excavation groove 45 in the lateral direction. Similarly to the above, by providing the heating element 48 at an angle, the excavation groove 44 can be provided obliquely on the vertical wall 41, and the oblique excavation groove 44 is made a deep excavation groove 45 in the same manner as described above. You can

[0063]

[Effect] By using the “method of providing a groove in concrete” which is the present invention, no explosion is caused.
It is now possible to safely form deep grooves. others
For this reason, concrete is dismantled with a crushing device that uses the impact of a weight that uses compressed air, hydraulic pressure, or electricity as a power source, a so-called rock drill or breaker, and without placing concrete again, It has become possible to provide widening grooves , excavation grooves, through grooves, and holes in concrete without generating noise. For this reason, it is possible to remodel the concrete portion of such a building even when the office is in operation or when there are inpatients in the hospital.

[Brief description of drawings]

FIG. 1A is a cross-sectional view showing a situation in which a narrow groove provided on a concrete surface is heated to weaken mortar around the narrow groove.

FIG. 2B is a cross-sectional view of the widened groove formed by removing the fragile portion in FIG. 1A.

FIG. 3 is a cross-sectional view showing a situation in which a narrow groove provided at the bottom of the widened groove in FIG. 2B is heated to weaken the mortar around the narrow groove.

FIG. 4A is a cross-sectional view showing a state in which the concrete surface is being peeled off. (B) is a cross-sectional view showing a state where the concrete surface is stripped off.

FIG. 5 is a cross-sectional view showing a state in which a heating element is installed on the surface of concrete and the surface of the concrete and the lower part of the surface are weakened.

FIG. 6 is a cross-sectional view showing a state in which the bottom portion of the groove formed by removing the fragile portion in [FIG. 5] is heated to weaken the mortar on the bottom portion.

FIG. 7 is a partial cross-sectional perspective view showing a state in which a heating element is installed to heat the bottom of the excavation groove provided in the vertical wall of concrete.

[Explanation of symbols]

1 ‥‥‥‥‥‥ Concrete 2 ……………………………… Aggregate 3 ………………………… sand 4 ‥‥‥‥‥‥‥‥ Mortar 5 ‥‥‥‥‥‥ Narrow groove 6 ... bottom 7 ‥‥‥‥‥‥ Heating element 8 ‥‥‥‥‥‥‥ Vulnerable part 9 ‥‥‥‥‥‥ Sound department 10 ... the surface 11 ... isotherms 12a, 12b, 12c ..................... Crushed stone 12d, 12e, 12f …………………… Crushed stone 12g, 12h, 12i …………………… Crushed stone 13 ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 14 ... widening groove 15 ‥‥‥‥‥‥‥ Bottom 16a, 16b, 16c ..... Cavity 17 …………………………… 18 ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 19 ‥‥‥‥‥‥‥ Small groove 20 ‥‥‥‥‥‥ Isotherm 21 ‥‥‥‥‥‥‥ Vulnerable part 22 ‥‥‥‥‥‥ Heating element 23 ‥‥‥‥‥‥‥‥ Groove 24 ‥‥‥‥‥‥‥ Opening hole 25 ‥‥‥‥‥‥‥ Narrow groove 26 ‥‥‥‥‥‥‥‥‥ Wider groove 27 ‥‥‥‥‥‥‥‥‥‥ Wider groove 28 ‥‥‥‥‥‥‥‥‥ Wider groove 29 ‥‥‥‥‥‥‥‥ Stripping part 30 ‥‥‥‥‥‥ Heating element 31 ‥‥‥‥‥‥‥ Heat shield cover 32 ‥‥‥‥‥‥ Isotherm 33 ‥‥‥‥‥‥ Vulnerable part 34 ‥‥‥‥‥‥ Crushed stone 35 ‥‥‥‥‥‥‥ Drilling ditch 36 ‥‥‥‥‥‥ Heating element 37 ... Isotherm 38 ‥‥‥‥‥‥ Vulnerable part 39 ‥‥‥‥‥‥ Crushed stone 40 ‥‥‥‥‥‥‥ Drilling ditch 41 ... Vertical wall 42 ‥‥‥‥‥‥‥ Surface 43 ‥‥‥‥‥‥‥‥‥‥ 44 ‥‥‥‥‥‥‥ Drilling ditch 45 ‥‥‥‥‥‥‥ Drilling ditch 46 ‥‥‥‥‥‥ 47 ... Heating element support device 48 ‥‥‥‥‥‥ Heating element 49a, 49b ........................ Hanging shaft 50 ‥‥‥‥‥‥ Support stand 51 ‥‥‥‥‥‥‥ Support tube 52a, 52b ........................... Stepped flange 53 ... Projection plate 54 ... Adhesive tape

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields investigated (Int.Cl. ⁷ , DB name) B02C 19/00-25/00 E04G 23/08

Claims (10)

(57) [Claims] 1. Nik in a narrow groove provided on the surface of concrete.
Install a heating element consisting of ROM wire or gas burner
The heat generated by the heating element causes the inner wall of the narrow groove to reach a temperature of about 7.5 ° C per minute.
By heating at a heating rate, the concrete surface
Move the 300 ° C position from the narrow groove to the position of about 25 mm.
When moving, stop the heating, and then
Weakened the mortar with a vibrating cutter and powdered it.
A method of forming widened grooves on the surface of concrete by removing crushed stone, sand, and mortar that are located in the fragile portion of the reet . 2. A brittle mortar part is pulverized by a vibration cutting machine.
Claim 1 by digging out concrete aggregate
Method of providing the widened groove described. 3. The method according to claim 1 or 2 , wherein each of the plurality of rows of fine grooves provided on the surface of concrete at appropriate intervals.
To providing a widening groove in a way that Ru provided wide grooves according
Therefore, leaving the weakened insufficient portion in a wall shape, the wall-shaped weakened insufficient
Hammer the upper part of the part and fold it down to weaken the wall
A method in which the surface of concrete is widely peeled off by removing the insufficiently converted portion . 4. The widened groove according to claim 1 or 2.
After providing a widening groove on the concrete surface by the method of providing ,
A narrow groove is provided on the bottom of the widened groove by a vibration cutting machine.
A method for providing the widened groove according to claim 1 or 2 to
A method of deepening the bottom of the widening groove by repeatedly providing the widening groove by the method. 5. Nichrome wire or moth on the surface of concrete
A heating element consisting of a sverner is installed in a line, and the heating element is
The inner width is about 25 mm from the heating element across the center
Install a heat shield cover on the surface, and then heat the
Heat the surface of the concrete in the cover
The position of 300 ° C on the surface of the
When moving to the position of m, stop the heating,
Located below the surface within a range of approximately 25 mm from the heating element.
The weakened mortar is pulverized with a vibration cutting machine
Removes crushed stone, sand and mortar from vulnerable areas of cleats
A method of providing a digging groove on the surface of concrete by doing. 6. A brittle mortar portion is pulverized by a vibration cutting machine.
Claim 5 by digging out concrete aggregate
A method for providing the described excavation trench. 7. An excavation groove according to claim 5 or 6 is provided.
The excavation according to claim 5 or 6 , which is provided on the bottom surface of the provided excavation groove after the excavation groove is provided on the concrete surface by the drilling method.
Repeat to deepen the bottom <br/> surface of the excavation by providing the excavation in a manner providing grooves, deep body concrete
How to set the groove. 8. An excavation groove according to claim 5 or 6 is provided.
After making a ditch on the concrete surface by
Excavation according to claim 5 or 6, on the bottom surface of the excavated trench.
The bottom of the excavation trench by providing the excavation trench by the method of providing the trench
And repeat that to deepen the surface, concrete to the full width
How to cut across . 9. An excavation groove according to claim 5 or 6 is provided.
After making a ditch on the concrete surface by
Excavation according to claim 5 or 6, on the bottom surface of the excavated trench.
The bottom of the excavation trench by providing the excavation trench by the method of providing the trench
And repeatedly to deepen the surface, a method of providing a through groove <br/> concrete. 10. The widening according to claim 1 or claim 2.
It was among the method or claim 5 or the method of providing the excavation of claim 6 wherein providing the groove, mortar in any of claims
How to make a groove in the groove.