KR102376208B1 - Reinforced concrete bridge eco-friendly dry cutting and dismantling method - Google Patents

Abstract

An objective of the present invention is to provide an eco-friendly method for dry-cutting and dismantling a reinforced concrete bridge which can quickly, easily, and efficiently cut and dismantle a bridge in a dry manner by using bubbles or mist for cutting member overheating and dust created when cutting the bridge by using a bridge dismantling device consisting of a core bit, a wheel blade, and a wire saw to dismantle the bridge. To achieve the objective, according to the present invention, the eco-friendly method for dry-cutting and dismantling a reinforced concrete bridge consisting of a superstructure, a substructure, and additional facilities comprises: a step (S I) of checking a cutting position of the bridge; a step (S II) of drilling the superstructure of the bridge in a grid direction in a longitudinal direction and a bridge width direction by a core bit to form a plurality of drilled holes; a step (S III) of hanging an outer connection ring of a rope or a four-way chain on four drilled holes positioned in an area to be cut among the drilled holes in a transportable size, and fixing the inner connection ring of the rope on a crane; a step (S IV) of cutting the superstructure of the bridge into a transportable size by a wheel blade; a step (S V) of loading cut pieces of the superstructure on a truck by the crane; a step (S VI) of loading cut pieces of the substructure on the truck by the crane while cutting the same from the upper end of the substructure of the bridge toward the lower end at regular height intervals into a transportable size by a wire saw while the superstructure of the bridge is dismantled; and a step (S VII) of loading cut pieces of the lower end of the substructure on the truck by the crane while cutting the same up to the lower end of the substructure into a transportable size by the wire saw.

Description

Reinforced concrete bridge eco-friendly dry cutting and dismantling method

The present invention relates to an eco-friendly dry cutting and dismantling method for a reinforced concrete bridge, in particular, using a core bit, wheel blade, and wire saw to cut the upper and lower structures of a reinforced concrete bridge, and collect the dust generated during cutting with a dust collector It relates to an eco-friendly dry cutting and dismantling method for a reinforced concrete bridge that efficiently cuts and dismantles a reinforced concrete bridge by cooling the overheating of the cutting edge of the cutting member generated during cutting with foam or mist.

In general, a bridge is a bridge that is constructed for the purpose of crossing a river, valley, river, lake, coast, or strait that is an obstacle on a transportation route such as a road, railroad, waterway, or bypassing another road, railroad, house, farmland, or city area. structures are collectively referred to as

Here, the above-mentioned bridge is largely composed of an upper structure, a lower structure, and ancillary facilities (Ancillaries).

The superstructure is a structure on an abutment or pier, that is, a structure that crosses an obstacle, and the type of bridge is usually determined depending on which structure is used.

If the superstructure is a girder, it is called a girder bridge, if it is an arch, it is called an arch bridge, if it is a truss, it is called a truss bridge.

The most commonly used type is the girder bridge, and there are many types of bridges depending on the structural type of the girder.

The slab is installed on the upper part so that vehicles, etc. can move.

In the case of a steel deck (steel deck), it is the superstructure of a bridge made of steel without a slab.

Pave the slab so that vehicles can pass, and install railings or median barriers.

In addition, the substructure means structures such as abutments and piers that support the load acting on the superstructure and safely transmit it to the ground.

The abutment is a structure at the start/end point of the bridge, supporting the superstructure and supporting the soil behind the abutment.

A pier is a column-type structure that supports the superstructure between abutments.

The substructure should be installed on a solid ground, but if the ground is not solid, partial subsidence or subsidence may occur, adversely affecting the entire bridge.

These substructures usually expand the base part widely, in order to more safely transmit the upper load to the ground by reducing the load per unit area by distributing the upper load over a wide area.

If the pier foundation ground is not strong enough, the bridge can be safely supported by reinforcing the pier foundation ground or transferring the load to the more solid ground/rock below using piles.

On the other hand, ancillary facilities refer to protection facilities such as bridge supports, expansion joints, pavements and railings, traffic facilities such as street lights, lanes/signs, and inspection facilities. it means.

Among them, the bridge support is a device that supports the superstructure and is installed to reduce the stress of the superstructure related to it by allowing/controlling the movement of the superstructure due to vehicle load, temperature, and earthquake.

Here, the bridge bearing increases in the direction of the bridge axis due to the rise in temperature in the summer season. At this time, if the bridge bearing is fixed at the bridge bearing, the load on the bridge is increased as much as the upper part of the bridge cannot expand and contract.

If the bridge supports are given elasticity so that the bridge can be stretched, a corresponding amount of load is reduced.

In addition, at the starting and ending points of the bridge, an interval is provided in consideration of the length of the bridge expanding and contracting due to temperature, and an expansion joint device is installed so that the vehicle can safely pass even if the interval increases or decreases.

It is usually installed on the abutment, but in the case of a long bridge, the amount of expansion and contraction of the entire bridge is very large.

As described above, the reinforced concrete bridge consisting of the upper structure, the lower structure, and the auxiliary facilities deteriorates over a long period of time after construction. It must be dismantled to fit in.

Here, in the prior art, for the demolition and dismantling of the existing reinforced concrete bridge, in order to secure a working space for the dismantling device for dismantling the superstructure, a highway or bridge is installed on the side of the reinforced concrete bridge, the demolition equipment is put in, and the demolition work is performed. method was applied.

However, the conventional method for dismantling a reinforced concrete bridge as described above has the following problems.

First, in the conventional reinforced concrete bridge dismantling method, there is a problem of excessively inputting construction costs, such as adding installation air for installing roads and bridges in deep river bridges or mountain bridges with deep valleys.

Second, in the case of the road in the case of the conventional reinforced concrete bridge dismantling method, there is a problem in that the environment is destroyed due to the pollution of the river due to the generation of turbidity due to the sediment in the river bridge and the damage to the trees in the case of the mountainous terrain.

Third, in the conventional reinforced concrete bridge dismantling method, the road of the river bridge is covered with soil under the side of the existing bridge, so there is a problem that it may be lost due to the sudden increase in river water in case of rain, such as torrential rain.

Patent Publication 10-2009-0109647

Accordingly, the present invention has been devised to solve the above problems, and to dismantle the bridge, using a bridge dismantling device consisting of a core bit, a wheel blade and a wire saw, dust generated when cutting a bridge and cutting members The purpose of this is to provide an eco-friendly dry cutting and dismantling method for reinforced concrete bridges that allows the bridge to be cut and dismantled quickly, easily and efficiently in a dry manner using foam or mist.

Reinforced concrete bridge eco-friendly dry cutting and dismantling construction method according to the present invention for achieving the above object

In a bridge consisting of a superstructure, a substructure, and ancillary facilities,

Checking the cut position of the bridge (S I);

forming a plurality of drilling holes by drilling the upper structure of the bridge with a core bit in a grid direction along the bridge axis and the bridge width direction (S II);

Hanging the outer connecting ring of a quadrangular chain or rope with a transportable size in four perforated holes located in the area to be cut among the perforated holes, and fixing the inner connecting ring of the rope to the crane (S Ⅲ);

cutting the superstructure of the bridge to a size that can be transported by a wheel blade (S IV);

Loading the cut product of the superstructure on a truck with a crane (S V);

Loading the cut material of the lower structure on the truck with a crane while cutting it to a size that can be transported with a wire saw at regular height intervals from the upper end to the lower end of the lower structure of the bridge in the state in which the upper structure of the bridge is dismantled (S VI) ;

It is characterized in that it consists of a step (S VII) of loading the cut material of the lower end of the lower structure on a truck with a crane while cutting it to a size that can be transported with a wire saw to the lower end of the lower structure.

As described above, the eco-friendly dry cutting and dismantling method for a reinforced concrete bridge according to the present invention has the following effects.

First, in the eco-friendly dry cutting and dismantling method of the reinforced concrete bridge according to the present invention, a core bit is used, but frictional heat and dust generated when the core bit is used can be efficiently and environmentally treated using foam or mist.

Second, in the eco-friendly dry cutting and dismantling method of the reinforced concrete bridge according to the present invention, the core bit uses a sintered or electrodeposited core bit having a specially formed bit, so that a separate cooling means is unnecessary. There are advantages that can be

Third, the environmentally friendly dry cutting and dismantling method for a reinforced concrete bridge according to the present invention cools the overheated wheel blade with foam or mist to cut the bridge to be cut (complete cutting of the reinforcement part) and remove moisture (suction), then dry wire The remaining (mortar part) superstructure (slab) is cut by using the saw cutting method in combination, and the dust generated at this time can be collected and treated with a dust collector.

Fourth, in the eco-friendly dry cutting and dismantling method for reinforced concrete bridges according to the present invention, a wire saw with high-efficiency granular beads (sintered) and electrodeposited beads is applied to dry the remaining (mortar part) concrete member and cut The dust generated during the process can be collected and treated with a high-performance dust collector.

1 is an exemplary view showing a drilling state of a drilling hole for the upper structure of a bridge;
2 is an exemplary view showing a state in which the outer connecting ring of a quadrangular chain or wire rope is hung in the perforation hole of the area to be cut, and the inner connecting ring of the rope is hung on the crane;
3 is an exemplary view showing a pre-cut state of the superstructure;
4 is a dust collection and sludge-wastewater treatment system diagram when using a wheel blade;
5 is an exemplary view showing the state of cutting the uncut portion of the upper structure using a wire saw;
Figure 6 is an exemplary view showing a state of cutting the lower end of the bridge lower structure with a wire saw.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 to 6, the environmentally friendly dry cutting and dismantling method for a reinforced concrete bridge according to the present invention is a bridge (B) consisting of an upper structure (S), a lower structure (P) and ancillary facilities, the Checking the cut position of the bridge (B) (S I);

forming a plurality of drilling holes (H) by drilling the upper structure (S) of the bridge (B) with a core bit (10) in a grid direction along the bridge axis and the bridge width direction (S II);

Among the drilling holes (H), the outer connection ring of a quadrangular chain or rope (R) is hung on the four drilling holes (H) located in the area to be cut into a size that can be transported, and the inner connection ring of the rope is removed by a crane (C) ) fixing to (S Ⅲ);

Cutting the upper structure (S) of the bridge (B) to a size transportable by the wheel blade (20) (S IV);

Loading the cut product of the superstructure (S) on a truck with a crane (C) (S V);

In the state in which the upper structure (S) of the bridge (B) is dismantled, the crane ( C) loading the cut product of the substructure (P) on the truck (S VI);

It consists of a step (S VII) of loading the cut product of the lower end of the lower structure (P) onto a truck with a crane (C) while cutting to a size transportable with the wire saw (30) up to the lower end of the lower structure (P).

That is, the environmentally friendly dry cutting and dismantling method for reinforced concrete bridges according to the present invention is a cutting position confirmation step (S I), a drilling hole forming step (S II), a crane fixing step (S Ⅲ), a wheel blade cutting step (S IV) , the truck loading step (S V), the lower structure is cut with a wire saw, and then the truck loading step (S VI) and the substructure cutting material truck loading step (S VII) are composed.

Here, the step of confirming the cutting position (S I) is a step of visually confirming the cutting position of the entire or part of the upper structure (S) or the lower structure (P) of the bridge (B) and displaying it with a spray.

In addition, in order to minimize the generation of dust generated during cutting at the cutting position, foam or mist may be applied prior to use of the dismantling device.

In particular, the foam or mist mainly uses a surfactant, but the surfactant is an anionic anion such as alpha olesulfonic acid sodium salt, linear alkylbenzene sulfonic acid sodium salt, sodium lauryl sulfate, anionic polyoxyethylene alkyl ether, etc. Use surfactants.

Here, in the foam and mist generated by the anionic surfactant, the terminal groups are negatively charged.

On the other hand, with the provision of the cation jet means for classifying the cations into the suspended particulates, the suspended particulates combined with the sorted cations are positively charged.

Since the electrostatic attraction acts between the negatively charged mist and the positively charged suspended particulates, the mist and the suspended particulates are likely to be connected.

Accordingly, the ability to collect dust and the like due to the mist is improved.

In addition, as the lubricating particles are added to the surfactant, minute lubricating particles are interposed between the surface wetted with the surfactant and the shoes of the workers, thereby increasing the frictional resistance of the floor.

Accordingly, it is possible to prevent the operator from slipping and falling.

In particular, the diameter of the lubricating particles is 5 to 30 nm.

Here, the surfactant may be used alone if necessary.

Subsequently, in the drilling hole forming step (S II), the upper structure (S) of the bridge (B) is drilled with a core bit (10) to form a plurality of drilling holes (H) having a certain size, and the drilling hole ( It is a step of connecting one side of the connecting ring of the rope (R) to H) and connecting the other side of the connecting ring to the crane (C).

That is, by using the diamond cutting edge of the core bit 10 to form a drilling hole (H) in the upper structure (S) of the bridge (B), vibration is minimized to reduce the vibration of the upper structure (S) of the bridge (B). Drill without damage, and connect the connecting ring of the rope (R) to the upper structure (S) of the bridge (B) and the crane (C) in the perforated part, respectively, and use the crane (C) to the upper structure of the bridge (B) ( S) to secure the holding state.

Then, the crane fixing step (S Ⅲ) is a 4-round chain or rope with a size that can be transported to the four drilling holes (H) located in the area to be cut when the drilling hole (H) is formed using the core bit (10) (R) is a step of hooking the outer connecting ring, and fixing the inner connecting ring of the rope (R) to the crane (C).

That is, this is to induce the cutting of the upper structure S in a stable state by overcoming the instability of the cut material when cutting the upper structure S to a size that can be transported using the following wheel blades 20 .

Subsequently, the wheel blade cutting step (S IV) is cut by the core bit 10, and a certain part of the upper structure S is gripped by the crane C in the state connected by the connecting ring of the rope R The upper structure (S) of the bridge (B) in one state is cut to a size that can be transported using the wheel blade (20).

That is, the superstructure (S) to a size capable of transporting the superstructure (S) of the bridge (B) using the wheel blade (20) in a state where the crane (C) holds the superstructure (S) of the bridge (B) cut vertically and horizontally.

Subsequently, the truck loading step (S V) is performed by using the wheel blade 20 in a state in which the crane C holds the upper structure S of the bridge B to lift the upper structure S of the bridge B. After cutting the upper structure (S) of the bridge (B) to a transportable size vertically and horizontally, the cut material is lifted by a crane (C) and loaded onto a truck.

That is, after cutting the upper structure (S) to a size that can be transported by the wheel blade (20) in a state in which the upper structure (S) is gripped by the crane (C), the cut upper structure (S) is removed by the crane (C) to load the cutting material on the truck.

Next, after cutting the substructure P with the wire saw 30, loading on a truck (S VI) is the lower structure of the bridge B in the state where the upper structure S of the bridge B is dismantled. Cut to a size that can be transported with a wire saw 30 at regular height intervals from the upper end to the lower end of the lower structure P of the bridge (B) in a state where the upper end of the (P) is gripped by the crane (C), and the crane As (C), the cut product of the substructure (P) is loaded onto the truck.

That is, after cutting the lower structure (P) of the bridge (B) to a size that can be transported by the wire saw 30 at regular height intervals from the upper end to the lower end of the lower structure (P) in a state in which the crane (C) is gripped, , and load the cut products on the truck with the crane (C).

Subsequently, the truck loading step (S VII) is to load the cut material of the lower end of the lower structure P to the truck with a crane C while cutting it to a size that can be transported with the wire saw 30 to the lower end of the lower structure P. .

That is, after cutting the lowermost part of the lower structure P of the bridge (B) to a size that can be transported with the wire saw 30 in a state of holding the crane (C), the cut product is transferred to the truck with the crane (C). top off

On the other hand, if necessary, a step (S VIII) of cutting the foundation of the lower structure (P) of the bridge (B) can be added, and this is also applied in the same way as the method using the wheel blade (20) described above to apply the crane ( C) It is also possible to add the step of cutting the foundation to a size that can be transported using the wheel blade 20 in a state of holding the foundation with C), and lifting the cut product with a crane (C) and loading it on a truck. make it clear

The reinforced concrete bridge eco-friendly dry cutting and dismantling method according to the present invention having the configuration as described above confirms the cutting positions of all and parts of the upper structure (S) and the lower structure (P) of the bridge (B), and the bridge After perforating the upper structure (S) of (B) with the core bit 10 to form a perforated hole (H), one side of the connecting ring of a separate rope (R) is installed in the perforated hole (H), After connecting the other side of the connecting ring of the rope (R) to the crane (C), the upper structure (S) of the bridge (B) is cut to have a constant transport size using the wheel blade (20), After loading the cut material cut from the superstructure (S) of the bridge (B) on a truck using a crane (C), in the state in which the superstructure (S) of the bridge (B) is crushed, The upper part of the lower structure P of the bridge B is cut by hanging the wire saw 30 on the lower structure P, and the foundation of the bridge B in the state where the lower structure P of the bridge B is crushed. After cutting the foundation using the wheel blade 20 on the surface, the cut material is transported by a crane (C) and loaded on a truck, thereby foaming the dust generated when cutting the bridge (B) and overheating of the cutting edge Alternatively, there is an effect of being able to cut and disassemble the upper structure (S) and the lower structure (P) of the bridge (B) in a dry type using mist to a cut size that can be easily and easily transported.

Hereinafter, the use of the dismantling device used in each step in the environmentally friendly dry cutting and dismantling method of the reinforced concrete bridge according to the present invention will be described.

1 is an exemplary view showing a drilling state of a drilling hole for the upper structure of the bridge.

As shown in this figure, the core bit 10 used in the environmentally friendly dry cutting and dismantling method of the reinforced concrete bridge according to the present invention installs the injection pipe 12 at a predetermined upper position horizontally, and the injection pipe ( 12) by installing at least one injection nozzle 14 at a predetermined position, injecting foam or mist through the injection pipe 12, and injecting foam or mist through the injection nozzle 14, It cools the heat generated when the core bit 10 is drilled with foam or mist and collects dust.

In addition, the core bit 10 is used by installing a bit 16 to which diamond powder is sintered or electrodeposited at a lower portion thereof.

The core bit 10 according to the present invention configured as described above is a dust treatment type drilling method using foam or mist, and heat and dust generated when the dry core bit 10 is drilled is easily processed using foam or mist. There are effects that can be done.

In addition, the core bit 10 has the effect that the bridge 36 can be drilled with the dry core bit 10 without a separate cooling means by using the specially manufactured electrodeposited bit 16 .

2 is an exemplary view showing a state in which the outer connecting ring of a quadrangular chain or wire rope is hung in the perforation hole (H) of the area to be cut, and the inner connecting ring of the rope is hung on the crane.

3 is an exemplary view showing a state in which the upper structure is preliminarily cut with a wheel blade in the environmentally friendly dry cutting and dismantling method for a reinforced concrete bridge according to the present invention, and FIG. 4 is a dust collection and sludge-wastewater treatment system diagram when the wheel blade is used am.

As shown in these drawings, the wheel blade 20 in the environmentally friendly dry cutting and dismantling method of the reinforced concrete bridge according to the present invention installs the injection pipe 22 horizontally at a predetermined position, and the injection pipe 22 At least one injection nozzle 24 is installed at a predetermined position in the Using mist, heat and dust generated when the bridge 36 is cut with the wheel blade 20 are collected.

The wheel blade 20 among the concrete bridge dry dismantling devices used for the eco-friendly dry cutting and dismantling method of the reinforced concrete bridge according to the present invention having the configuration as described above is the bridge to be cut by the wheel blade cooling method using foam or mist ( 36) after cutting (complete cutting of reinforcing bar) and removing moisture (suction), the remaining (mortar part) slab is cut using the dry wire saw 30 cutting method in combination, and the generated cutting dust is transferred to the dust collector 42 There is an action effect that can be treated by collecting dust.

5 is an exemplary view showing the cutting state of the uncut portion of the upper structure using a wire saw, and the wire saw three-dimensional bead 32 is installed on the wire saw 30 in the environmentally friendly dry cutting and dismantling method of the reinforced concrete bridge according to the present invention. The diamond powder is installed on the wire saw three-dimensional bead 32 in a sintered or electrodeposited manner.

In the eco-friendly dry cutting and dismantling method of the reinforced concrete bridge according to the present invention having the configuration as described above, the dry wire saw 30 is a high-efficiency wire saw three-dimensional bead 32 and electrodeposited wire saw 30 applied to the remaining (mortar part) ) The concrete bridge 36 is cut in a dry way, and the dust generated during cutting has the effect of collecting and collecting dust using the high-performance dust collector 42 and then treating it.

6 is an exemplary view showing the state of cutting the lower end of the bridge lower structure with a wire saw, the wire saw 30 is installed on the bridge 36 in the environmentally friendly dry cutting and dismantling method of the reinforced concrete bridge according to the present invention, A dust collecting cover 38 is installed on the passage part of the wire saw 30 of the bridge 36, and the dust collecting hose 40 is sucked in the part where the bridge 36 and the wire saw 30 come into contact and cut. and a dust collector 42 is installed in the dust collecting hose 40 .

In the eco-friendly dry cutting and dismantling method of the reinforced concrete bridge according to the present invention having the configuration as described above, the wire saw 30 is a high-efficiency sintered wire saw three-dimensional bead 32 and electrodeposited wire saw 30 applied to the remaining (mortar) Part) The bridge 36 is cut in a dry way, and the dust generated when the bridge 36 is cut has the effect of collecting and collecting dust using the high-performance dust collector 42 and then treating it.

As described above, the eco-friendly dry cutting and dismantling method for a reinforced concrete bridge according to the present invention is a method of cutting and dismantling a bridge, and the upper and lower structures and auxiliary facilities constituting the reinforced concrete bridge are optimal for each part. Cutting and dismantling using the bridge dismantling device of It has the effect of being able to easily cut bridges in a dry way using foam or mist.

On the other hand, in the description of the present invention, the bridge has been exemplarily described with respect to the reinforced concrete bridge for convenience of explanation, but is not limited thereto, and regardless of the form of the superstructure of the bridge, a steel bridge, a girder bridge, an arch bridge, a truss bridge, a cable-stayed bridge , suspension bridges, etc., the scope of the present invention is indicated by the appended claims, and all modifications falling within the meaning of those claims are included in the present invention.

10: core bit 12: injection tube
14: injection nozzle 16: bit
20: wheel blade 22: injection pipe
24: injection nozzle 30: wire saw
32: wire saw three-dimensional bead 38: dust collection cover
40: dust collection hose 42: dust collector
B: Bridge P: Substructure
C: Crane H: Drill hole
P: Substructure R: Rope
S: superstructure

Claims (6)

In a bridge consisting of a superstructure, a substructure, and ancillary facilities,
Checking the cut position of the bridge (S I);
forming a plurality of drilling holes by drilling the upper structure of the bridge with a core bit in a grid direction along the bridge axis and the bridge width direction (S II);
Hanging the outer connecting ring of a quadrangular chain or rope with a transportable size in four perforated holes located in the area to be cut among the perforated holes, and fixing the inner connecting ring of the rope to the crane (S Ⅲ);
cutting the superstructure of the bridge to a size that can be transported with a wheel blade (S IV);
Loading the cut product of the superstructure on a truck with a crane (S V);
Loading the cut material of the lower structure onto the truck with a crane while cutting it to a size that can be transported with a wire saw at regular height intervals from the upper end to the lower end of the lower structure of the bridge in the state in which the upper structure of the bridge is dismantled (S VI) ;
It consists of a step (S VII) of loading the cut product of the lower end of the lower structure on a truck with a crane while cutting it to a size that can be transported with a wire saw to the lower end of the lower structure,
The core bit horizontally installs an injection tube at a predetermined position on the upper part, and at least one injection nozzle is installed at a predetermined position of the injection tube, and sprays bubbles or mist through the injection tube and injection nozzle, An eco-friendly dry cutting and dismantling method for reinforced concrete bridges, characterized by cooling the heat generated during bridge drilling with sprayed foam or mist and collecting dust. delete According to claim 1,
An eco-friendly dry cutting and dismantling construction method for a reinforced concrete bridge, characterized in that a core bit to which diamond powder is sintered or electrodeposited is installed on the lower portion of the core bit. According to claim 1,
The wheel blade horizontally installs an injection tube at a predetermined position, at least one injection nozzle is installed at a predetermined position of the injection tube, and injects foam or mist through the injection tube and foams through the injection nozzle Alternatively, an eco-friendly dry cutting and dismantling method for reinforced concrete bridges, characterized by spraying mist to cool the heat generated during bridge cutting and to collect dust. According to claim 1,
An eco-friendly dry cutting and dismantling method for a reinforced concrete bridge, characterized in that a wire saw three-dimensional bead is installed on the wire saw, and diamond powder is installed on the wire saw three-dimensional bead by sintering or electrodeposition. 6. The method of claim 1 or 5,
The wire saw is installed on the bridge, a dust collection cover is installed on the passage part of the wire saw of the bridge, and a dust collection hose is installed to suck the dust in the part where the bridge and the wire saw are cut in contact, and the dust collection hose is equipped with a dust collection hose. Reinforcement characterized in that a device is installed to spray foam or mist for heat generated when cutting a bridge, to cool the heat generated when cutting a bridge with sprayed foam or mist, and to collect dust through a dust collection hose and a dust collector Concrete bridge eco-friendly dry cutting and dismantling method.

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