KR100618604B1 - Cutting method and it's apparatus of concrete structure for demolish - Google Patents

Abstract

The present invention forms a slit groove in the structure when cutting to a suitable size to demolish a concrete building or civil engineering structure, and then cut the rest of the slit groove by its expansion action through the expansion means The present invention relates to a cutting method and a cutting device for demolishing a concrete structure, which can reduce the working time and labor required for cutting and reduce the cost by causing the stress to be cut or destroyed while the stress is concentrated in the unstructured part.

That is, by selecting a cutting line on one side of the object to be cut to form a slit groove having a 3 mm to 10 mm interval with a wire saw or cutter blade to a depth of about 1/4 to 1/2 of the cutting layer, the slit The expansion means made by seamlessly welding two metal plates having the property of being expanded to a certain range by the fluid pressure and then restored to its original state when the hydraulic pressure is removed, the end of the welded portion of the expansion means The inlet connected to the pump and pipe for supplying the fluid pressure to the portion is formed firmly so that the fluid is injected and discharged inside the expansion means, thereby expanding the expansion means intervening in the slit groove by the fluid pressure supplied from the hydraulic pump. This expansion force is applied to open the slit groove, causing stress to concentrate on the uncut portion of the remaining layers of the slit groove, thereby cutting the structure and To be destroyed.

Concrete, cutting, slit groove, fluid pressure, expansion means

Description

Cutting method and it's apparatus of concrete structure for demolish}

Figure 1a and 1b is a perspective view of the slit groove formed on the specimen formed by the reinforcement formwork and thereby the specimen for cutting the concrete structure of the present invention,

Figure 2a is a plan view showing a state before the pressing of the expansion means involved in the slit groove formed in the concrete structure of the present invention,

2b and 2c are a plan view and an elevation view showing a state after pressurization of the expansion means;

Figure 3 is a schematic diagram showing an example of a pump for supplying a fluid pressure to the expansion means of the present invention,

4a, 4b, 4c is a state diagram in which each expansion means for cutting the concrete structure of the present invention and the expansion means is inserted into the slit groove of the concrete specimen,

5a to 5c is a configuration diagram showing a state in which the remaining portion of the slit groove is cut by the expansion action of the expansion means inserted into the slit groove;

Figure 6a to 6d showing the breaking test example of the concrete specimens at various angles,

7A to 7D are examples showing fracture states of reinforcing bars reinforcement to specimens of the present invention.

<Description of the symbols for the main parts of the drawings>

C: specimen R: rebar

S: Slit groove W: Welding

P: Pump

10: expansion means 11: inlet

The present invention is a cutting method and a cutting device for demolishing a concrete structure, more specifically, when forming a slit groove in the structure when cutting to a suitable size to demolish a concrete building or civil engineering structure, and so on Through the expansion means, the expansion action causes the stress to be concentrated or cut in the structure of the uncut portion of the remaining portion of the slit groove, thereby reducing the working time and labor required for cutting and reducing the cost. The present invention relates to a cutting method for removing a concrete structure and a cutting device thereof.

In general, various concrete structures used in construction or civil engineering are frequently inevitable when the service life is exhausted, safety problems occur, or because of reconstruction and design changes.

As a common method for dismantling a conventional concrete structure, the main part is to cut the entire cross-section of the object for cutting using a wire saw or a cutter blade, but the time required for cutting is the method. In proportion to the cutting area of the structure, the larger the cross-sectional area, the longer the cutting time was delayed and there was a problem that a lot of pollution such as noise and dust was generated.

In addition, when dismantling a structure by using a diamond bit, it is possible to work only when the device for driving the bit can be entered. Therefore, it was not possible to work on a structure that does not satisfy these conditions. In the case of using a hydraulic rock drill, drill a hole along the cutting plan line of the structure to be cut, and then insert a tool such as a booster bat into the hole to apply a strong impact at right angles to the hole. There was a problem that the tool was repeatedly cut back and forth, but was not cut as planned.

The present invention has been made in view of the above problems when cutting a conventional concrete structure, the object of which is a cutting method and a cutting device for demolishing a concrete structure that can be cut by the exact size of the concrete structure in a simple process To provide.

In order to achieve the above object, the present invention selects a cutting line on one surface of the object to be cut and cuts a slit groove having a spacing of 3 mm to 10 mm with a wire saw or cutter blade to about 1/4 to 1/2 of the cutting layer. It is formed in the depth of the slit groove and expands in a certain range by the fluid pressure, and the expansion means made by seamless welding the two metal plates having the property of restoring to its original state when the hydraulic pressure is removed. The pump is configured to firmly form an injection port connected to a pump and a pipe for supplying a fluid pressure to the end of the welding part of the expansion means so that the fluid is injected and discharged inside the expansion means, thereby providing a fluid pressure supplied from the hydraulic pump. An uncut portion of the remaining layers of the slit groove by causing the expansion means intervening in the slit groove to expand so that this expanding force is applied to open the slit groove. Characterized in that as a stress concentration to be cut and destroy the structure.

Hereinafter, with reference to the accompanying drawings, a cutting method and a cutting device for demolishing the concrete structure of the present invention will be described in detail.

Figure 1a and 1b is a perspective view of the slit groove formed on the specimen and the specimen formed by the reinforcement form the reinforcement to the cutting example of the concrete structure of the present invention, the reinforcing bar (R) in the specimen ( C) the strength of 210Kg / ㎠, specimen thickness 25cm, slit groove (S) depth 10cm, the slit groove (S) is formed to maintain a gap of 3mm ~ 10mm with a wire saw or cutter blade.

It is preferable to limit the depth of the slit groove within the range of 1/4 to 1/2 compared to the thickness of the specimen to shorten the cutting time and reduce the noise.

Figure 2a is a plan view showing a state before the pressing of the expansion means involved in the slit groove formed in the concrete structure of the present invention, Figures 2b and 2c is a plan view and an elevation view showing a state after the pressing of the expansion means, the expansion means (10) is overlapped by two sheets of stainless steel or steel having the property of expanding in a certain range by the fluid pressure and restoring to the original state when the hydraulic pressure is removed. ), And an injection hole 11 is formed at the welded end thereof to inject and discharge fluid into the expansion means.

The thickness of the metal plate constituting the expansion means is 0.2mm ~ 1mm and the width of the weld portion for seamless welding (W) along the edge of the two sheets of metal is preferably in the range of 3mm to 15mm, the width and length of the expansion means In proportion to the slit groove formed in the length of the entire portion can be inserted, but the maximum length is preferably not more than 3m to ensure sufficient expansion force.

Figure 3 is a schematic diagram showing an example of a pump for supplying a fluid pressure to the expansion means of the present invention, the pump (P) is connected to the inlet port 11 of the expansion means 10 by a pipe or a high pressure hose, The fluid having fluidity such as waserine is expanded by applying a fluid pressure to the expansion means 10 in the discharge pressure range within a maximum of 300 Kg / cm 2.

Figures 4a, 4b, 4c is a state in which each expansion means for cutting the concrete structure of the present invention and the expansion means is inserted into the slit groove of the concrete specimen, Figures 5a to 5c is the expansion means of the expansion means inserted into the slit groove It shows a state in which the remaining portion of the slit groove is cut by the expansion action.

6A to 6D, the fracture test of the concrete specimens of the specimen (C) 25 cm thick, 210 kg / ㎠ in strength, the slit groove (S) of 10 cm depth grooves were dug into the plate before pressing to the slit groove When the expansion means 10 is pressurized and inflated by the fluid pressure discharged from the pump P through a pipe or a high pressure hose connected to the injection port 11 while the inserted expansion means 10 is inserted, the pressurized fluid When the pressure reached the range of about 40 kg / cm 2, the expansion force of the expansion means was applied to the wall surface of the slit groove, concentrating the stress on the uncut specimen layer of the sullet groove, thereby cutting or breaking the concrete mass.

At this time, the breaking (pressure) force at which the concrete is destroyed by the fluid pressure applied to the expansion means is calculated by the following equation.

expression; Breaking force (expansion means expansion area) x (fluid pressure-pressure loss)

After the specimen is cut as described above, the fluid pressure that pressurizes the expansion means is removed to recover the expansion means from the cut portion, thereby repeatedly regenerating the first used expansion means.

In addition, the fluid pressure pressurizing the expansion means acts only inside the expansion means, but when an unexpected leak occurs, the fluid is ejected from the inside of the slit groove, so there is no problem for safety.

The pump for generating the fluid pressure only needs to discharge a discharge amount sufficient to satisfy the contents of the seamless welded expansion means, so that a sufficient pressure action is possible even with a small capacity, and thus it can be used as a compact and lightweight model.

Figure 7a to 7d is another embodiment each showing a fracture state of the reinforcing bar reinforcement to the specimen of the present invention, the specification of the reinforcing bar (R) is 13φ * 1 diameter.

The concrete strength of the specimen is shown as 210kg / ㎠ but the strength represents the compressive strength, considering that the tensile strength is about 1/10 of the compressive strength of the expansion means by using the strength characteristics of the concrete as described above It is the motivation to cut the specimen by expansion.

The size of the flat state before applying the fluid pressure to the expansion means is 100cm * 10cm, the size of the expanded state is about 97cm * 7cm except for the seamless welded around the circumference and the expansion area is 679cm2 Therefore, in order to expand the expansion means about 10mm, the pressure of the fluid pressure is 15-30 kg / ㎠ is sufficiently expanded. For example, when the fluid pressing force applied to the expansion means is 180 kg / cm 2 and the pressure loss is 30 kg / cm 2, the pressure of 150 kg / cm 2 is applied to the expansion means having an expansion area of 679 cm 2 according to the above equation. The breaking force is 150 kg / cm 2 × 679 cm 2 = 101.86 tons (ton).

Therefore, the area that can destroy 210kg / cm2 strength-free concrete by expansion means is 4850㎠, the length is 1m, the thickness is 58,5cm, and the remaining thickness is 48, when the initial cutting depth (slit groove) is 10cm. 5cm can be easily destroyed. In addition, in the reinforcing bar fracture test, the tensile strength of the reinforcing bar having a diameter of 13φ can be broken to 5.3 tons assuming that the strength of the general steel is 40 kg / mm 2, so that the breaking (pressure) force of the expansion means is considered when breaking only the reinforcing bar. Since 101.85, it was confirmed that about 19 reinforcing bars could be broken at the same time.

Therefore, the method of cutting the concrete structure of the present invention as described above is made of two pieces of metal in a state in which a slit groove of about 1/2 to 1/4 is formed from the surface along a plan line for cutting the entire thickness of the cutting object. The expansion force generated when the expansion member welded to the edge is expanded to the slit groove to be instantaneously cut or destroyed, thereby reducing the entire concrete structure using equipment such as wire saw or cutter blade. Compared to cutting, the operating time of cutting equipment can be shortened to reduce noise and dust generation by 1/2 to 3/4, and to cut working time for cutting.

In addition, the present invention can be reduced in size and light weight of the expansion means and the pump to apply a fluid pressure to it, conventionally without going through the preliminary process, such as raising the scaffolding structure or crane to remove the concrete structure to the corresponding work site It is extremely easy to transport, and therefore, it is easy to construct at work sites where cutting work is difficult in the past such as high places or narrow underground sections, and it is possible to install the product without being limited to places that are difficult to work such as underwater and lifesaving sites. .

The cutting method and the cutting device for dismantling the concrete structure of the present invention as described above is inflated by the fluid pressure in a state in which the slit groove is partially formed in the cutting object to the action of the expansion means for applying a tensile breaking force to the slit groove. By cutting the remaining part instantaneously, the operation time of cutting equipment is reduced by reducing the operation time of cutting equipment compared to when cutting the whole concrete structure by wire saw or cutter blade, etc. There is an economic effect to save.

In addition, the cutting equipment of the present invention has the advantage that it is possible to simply and easily cutting without being limited to the work place or the site conditions can be reduced in size and light weight.

Claims (6)

Selecting a cutting line in the concrete structure for cutting to form a slit groove (S) to a slight depth from the surface of the cutting layer by using a wire saw or cutter blade, and by the fluid pressure in the slit groove (S) Intervening an expansion means (10) made by seamlessly welding two sheets of metal plates to be expanded in a range, and a pump (P) for generating hydraulic pressure through the injection hole (11) provided in the expansion means (10) Injecting and expanding the fluid pressurized by the expansion means 10 to cut the remaining sample layer of the slit groove with the breaking force generated by the expansion force. Cutting method. According to claim 1, wherein the depth of the slit groove (S) formed in the concrete structure is formed to a depth of 1/2 to 1/4 from the surface for cutting, the gap of the slit groove (S) is formed of 3mm ~ 10mm Cutting method for demolishing the concrete structure characterized in that. The method of claim 1, wherein the expansion means 10 is expanded in a certain range by the fluid pressure, the cutting method for demolishing the concrete structure, characterized in that the stainless steel having the property of restoring to its original state when removing the hydraulic pressure .  According to claim 1 or 3, wherein the thickness of the metal plate constituting the expansion means is 0.2mm ~ 1mm and the width of the weld portion for seamless welding (W) along the edges of the two sheets of metal is in the range of 3mm ~ 15mm Cutting method for demolishing the concrete structure characterized in that. The breaking (pressure) force at which the concrete layer of the remaining portion of the slit groove is destroyed by the fluid pressure applied to the expansion means 10 is (expansion means expansion area) x (fluid pressure-pressure loss). Cutting method for demolishing a concrete structure, characterized in that calculated by the formula. In selecting the cutting line in the concrete structure and forming a slit groove (S) with a depth of about 1/2 to 1/4 and a gap of 3mm to 10mm from the surface of the cutting layer by using a wire saw or cutter blade, It is manufactured to be inserted into the slit groove (S) and is expanded in a certain range by the fluid pressure injected from the outside by seamlessly welding two sheets of metal plates having a property of restoring to the original state when removing the hydraulic pressure The expansion means 10, an injection port 11 provided at the end of the welded portion of the expansion means 10 to inject or discharge fluid into the expansion means, and a pipe or a high pressure hose to the injection hole 11; Cutting device for demolishing the concrete structure, characterized in that the configuration including a pump (P) is connected to the inflated means is injected into the expansion means (10).

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