KR20190121551A - Method of excavation - Google Patents

Abstract

The present invention relates to a non-vibration (or micro-vibration) excavation method using core equipment and, more specifically, to a non-vibration excavation method which is a blasting method effectively used in excavation in an area where a construction disaster such as vibration and noise created if explosives are used to remove rock during excavation foundation construction prior to tunnel excavation or structure erection must be prevented. A cylindrical core bit hole is bored on an excavation surface by core equipment. Then core rock in the core bit hole is removed without vibration by using a hydraulic jack or a wedge or is removed with micro-vibration by minimal blasting to prevent vibration and noise created during internal blasting from being transferred to the outside of the excavation surface to reduce vibration and noise and prevent vibration, noise, and scattering objects by blasting from spreading.

Description

Vibration-free drilling method using core equipment {METHOD OF EXCAVATION}

The present invention relates to a vibration-free (or non-vibration) excavation method using the core equipment, and more specifically, the vibration generated when using the explosives to remove the rock during the excavation foundation work before the tunnel excavation or construction of the structure A blasting method that can be used effectively when excavating in areas where blasting construction accidents, such as noise, should be prevented.After drilling cylindrical core bit holes on the excavating surface through core equipment, the internal core rock of the core bit hole is By using the wedge to remove vibrationlessly or with minimal blasting to remove it without vibration, the vibration and noise generated during internal blasting are prevented from being transferred to the outside of the excavation surface, reducing vibration and noise, and the vibration, The vibration-free excavation method to prevent the spread of noise and scattering products .

In general, as a preliminary step for constructing a tunnel or subway or constructing a structure such as a building, excavation or foundation work such as tunnels, sand tunnels, and shafts is carried out. Digging ground to create the foundation of the building).

Conventional techniques related to excavation and excavation of such tunnels, dead mines, and shafts are disclosed in Korean Patent Application Publication No. 10-2007-0045769, "Polster Rock Excavation Method Using Plasma." Due to the developmental requirements of the underground space, the development of underground spaces increases, so the proportion of excavation works for large-scale civil engineering works, construction works, and underground tunnel excavation increases, and vibrations impact the surrounding buildings when blasting for excavation. In order to solve this problem fundamentally, the use of gunpowder is minimized, but the gunpowder is mixed with an expanding agent selected from thermite agent, reaction rate enhancer, and electrolytic fluid, and depending on the distance from the building, New Plasma minimizes noise and vibration by adjusting the mixing ratio of the expansion agent and vice versa Using relates to Dig Rock Excavation Method. To this end, the present invention is used to mix the specific gravity of the gunpowder 5% or more and the expansion agent to 95% or less within 25m from the building, the gunpowder is 15% or more and the expansion agent to 85% or less within 50m from the building Within 70m from the building, gunpowder is used more than 25% and inflating agent is used less than 75%. In addition, within 25 meters of the building it is possible to use only the expansion agent without using gunpowder. According to the present invention of such a configuration, the excavation speed is very fast compared to the case of the physical force of the various heavy equipment, and compared to the case of using only gunpowder to provide a dig rock excavation method that can minimize gas, vibration and noise have.

In addition, there is a registered patent No. 10-0414435 `` Drainage non-supporting concrete soft ground breaking method '',

The prior art is to install a temporary earth wall for preventing soil disintegration when excavating to a predetermined depth in order to install underground facilities such as water and sewage pipes, sewage pipes, manholes, drainage on the soft ground, this time easy to dismantle or environmentally friendly It is to provide a non-supporting concrete soft ground breakthrough method with excellent drainage, which saves the cost of demolition and greatly reduces the cost of temporary earth wall installation work by reclamating the earth wall made of earthen material without removing it. The minimum required area for underground facilities Deciding the contour for the excavation in an area of sufficient margin according to the depth and depth; Excavating the earth wall groove with a constant width and depth along the initial trench profile; Laying a filter on the bottom of the earth wall groove, and layering the earthquake material having excellent drainage properties such as a straw mat or a soil mixed straw and a non-woven fabric roll to form a temporary support earth wall; An excavation step of digging the inner ground of the unsupported temporary earth wall to approximately the bottom of the earth wall groove; Installing a plurality of drain pipes on top of the filter in the excavated ground; The excavation process of the earth wall groove described above-the hypothetical hypothesis hypothesis suggests the drainage concrete soft ground rupture method that drills the excavation process that leads to the installation depth step by step to the design depth-installation of the earth wall-excavation of the ground inside the earth wall have.

However, although the rock is broken by the explosive power of the gunpowder, the rubble filled with the gunpowder flies along with the rock breaking, causing damage to surrounding objects or workers, as well as causing noise and scattering of debris. On the other hand, the explosives exploded in the hole is delivered to the irregular rock force to the target rock has a problem such as the explosion area is not constant to reduce the utilization rate of the crushed rock mass. In particular, the explosive rock crushing method has problems that construction cannot be used due to vibration, noise, rock scattering or civil petitions that occur during explosives such as building underground excavation or subway excavation. have.

The present invention has been made in order to solve the above problems, in the process of digging for excavation work or foundation work such as tunnel excavation or subway construction and sand tunnel, the line of the excavation surface is excavated, the remaining internal When excavating the excavated surface afterwards, the excavation of the excavated surface is processed in a non-vibration way using hydraulic jacks or wedge-type equipment or tools, or vibration and noise are reduced by using non-vibration blasting, and the generation of fly ash is reduced. It is an object of the present invention to provide a vibration free drilling method.

More specifically, when using a non-vibrating hydraulic jack, wedge-shaped equipment, tools, or the like to remove the cut portion in the rim of the excavation surface, or using a non-vibrating blasting, first drill the core bit hole using the core equipment, Insert hydraulic jacks or wedges into the edge gaps of the drilled core bit holes to remove (remove) the independent core rock parts inside the core bit holes without vibration, or have a blast hole inside the drilled core bit holes to excavate through micro vibration blasting. Therefore, it is another object of the present invention to provide a vibration-free excavation method that can reduce vibration and noise generation as well as reduce generation of by-products.

Furthermore, the second to ninth blasting hole is further provided around the central first blasting hole, and the blasting hole is sequentially blasted from the blasting hole proximate from the core bit hole, thereby further improving the blasting efficiency, reducing vibration and noise, and scattering. It is an object of the present invention to provide a vibration-free drilling method that can reduce the generation of water.

The present invention for achieving the above object has the following steps and features.

The present invention, using the core equipment for drilling a plurality of core bit holes at a predetermined interval on the drilling surface, and removing the core rock of the core bit hole inner diameter size, and by removing the remaining portion of the drilling surface Digging inside the excavation surface.

The removing of the core rock of the core bit hole inner diameter may include inserting a press crusher between the drilled gaps of the core bit hole, and inserting the press crusher inserted between the drilled gaps of the core bit hole. Pushing, and by pressing and crushing the core rock through the press-type crusher, characterized in that it may include the step of removing the core rock.

In addition, the step of removing the core rock of the core bit hole inner diameter size, the step of drilling a first blasting hole in the center of each core bit hole and a charge in the first blasting hole, and blasting the first blasting hole core And blasting the inside of the bit hole, and removing the remaining portion of the excavating surface to excavate the inside of the excavating surface, by separating the second to fourth blasting holes around the first blasting hole at a predetermined interval. The second to fourth blasting holes are drilled to form one rhombus shape around the first blasting hole, and the sixth to ninth blasting holes are spaced at regular intervals around the first blasting hole to form one quadrangular shape. However, drilling the second to fourth blast hole in the center of the adjacent blasting hole and the second to the ninth blasting hole to charge, and the second And blasting the second to ninth blasting holes sequentially to drill the excavation surface.

Further, the excavating surface includes a first blasting surface formed on the rim and a second blasting surface formed therein, and the core bit hole and the first to ninth blasting holes are drilled at a predetermined interval along the first blasting surface, and The amount of the charge flowing into the first blasting hole is provided less than the amount of the charge flowing into the second to ninth blasting hole, the first to the ninth blasting hole is continuously formed along the edge of the excavation surface, the longitudinal direction of the edge Adjacent blast holes are characterized in that can be formed by overlapping.

According to the present invention having the above steps and features, when the tunnel excavation or ground excavation work, which is one of the basic works for the construction of a structure such as a tunnel or a building, the excavation of the line using the core equipment is made with the edge of the set diameter. By post-excavating the center of the excavation surface, the core rock portion spaced apart from the ground surface outside the excavation surface by the edge gap in the post-excavation operation can be removed by the non-vibration method, in particular, the non-vibration method. When blasting is required, vibration and noise can be prevented from being transmitted, and the generation of fly ash can be reduced, thereby minimizing noise, vibration, and damage to fly around construction sites.

In addition, when digging the edge between the excavation surface and the excavation surface, it can be easily removed using equipment such as back-heavy, etc. Also, even when excavating the edge of the excavation surface, the work efficiency is improved through blasting using the charge. By forming core bit holes using core equipment, wedging between the gaps of core bit holes, removing (removing) using hydraulic jacks, or blasting blast holes in the interior to perforate the cylindrical space In addition, even when blasting the excavating surface (in the border) around it, there is an effect that can reduce the vibration and noise.

1 is a block diagram according to a first embodiment of the present invention.
2 is a front view according to the first embodiment of the present invention.
3 is an explanatory diagram of a first to third embodiment of the present invention;
4 is a plan view of a second embodiment of the present invention;
5 is a block diagram according to a fourth embodiment of the present invention.
6 is a plan view of a fourth embodiment of the present invention;
7 is a side view of a fourth embodiment of the present invention;
8 is a detailed view of the fourth embodiment of the present invention.

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

Since the present invention may be modified in various ways and have various forms, embodiments (or embodiments) will be described in detail in the text. However, this is not intended to limit the present invention to the specific form disclosed, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

In addition, in the drawings, the components are exaggerated in size (or thick) in size (or thick) in size (or thin) or simplified in consideration of the convenience of understanding and the like, thereby limiting the scope of protection of the present invention. It should not be.

The terminology used herein is for the purpose of describing particular embodiments (suns, aspects, and embodiments) (or embodiments) only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms “comprises” or “consists” are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described on the specification, but one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

Prior to the description of the present invention, the expression 'non-vibration' used in the description of the present invention and the name of the present invention means that there is no vibration, but according to the non-loading or minimizing the loading, It should be interpreted as a concept that includes significantly less vibration than the blasting method of.

First, as shown in Figures 1 to 4, the vibration-free drilling method (M) using the core equipment according to the present invention is the first step (10) to largely drill the core bit hole 110, the first to remove the core rock A second step 20 and a third step 30 to excavate the inside of the excavation surface.

For each step, the first step 10 is a step of drilling a plurality of core bit holes 110 at a predetermined interval on the excavation surface (B) by using the core equipment, as shown in Figure 2, core bit holes A plurality of 110 is provided at regular intervals throughout the excavation surface (B), the diameter (L110) is preferably made of 89mm ~ 500mm.

In the first step 10, the excavation surface (B) may be a predetermined area, such as a tunnel, a dead mine, a lift, a basic construction area of a structure, such as a building.

And in the first step 10, the core equipment for drilling the core bit hole 110 is composed of a bit and a driving unit for rotating it, a core drill may be used as a representative.

Next, the second step 20 is a step of removing the core rock of the inner diameter of the core bit hole 110, as shown in Figure 3, between the perforated gap (g) of the core bit hole 110 Method of inserting and crushing the press-type crusher, the method of blasting by forming the blast hole 210 in the center of the core bit hole 110, or the hydraulic rod in the insertion hole 120 formed in the center of the core bit hole 110 Insertion and cracking from the inside can be utilized. Specific implementation thereof will be described later.

Next, the third step 30 is a step of excavating the inside of the excavation surface by removing the remaining portion of the excavation surface, which is a removal step for the portion between one core bit hole 110 and the other core bit hole 110. .

In the present invention including the above step, when the excavation of the excavating surface (B), the core rock part is spaced apart from the ground outside the excavating surface (B) by the edge gap (g) of the core bit hole (110), The spaced apart core rock can be removed by a non-vibration method, and in particular, it is possible to prevent the transmission of vibration and noise, especially when micro-blast blasting is required, and to reduce the generation of fly ash.

According to FIG. 3, which illustrates the first to third embodiments M1, M2, and M3 of the present invention, the present invention provides a method for removing a core rock having an inner diameter of the core bit hole 110. 20), a method of inserting and crushing the press-type crusher between the drilled gaps g of the core bit hole 110 (M1), the blast hole in the center of the core bit hole 110 Method 210 to form and blast (second embodiment, M2), or to insert a hydraulic rod into the insertion hole 120 formed in the center of the core bit hole 110 to crack from the inside (third embodiment , M3) can be utilized.

According to the first embodiment M1, as shown in FIGS. 1 and 3 [A], the second step 20 of removing the core rock of the inner diameter of the core bit hole 110 may include a core bit hole ( Inserting a press-type crusher between the perforated gaps g of 110 and pushing the press-type crusher inserted between the perforated gaps g of the core bit hole 110 And pressing 23 and crushing the core rock through the press-type crusher, thereby removing the core rock.

In the first embodiment M1, the press-type crusher may include a hydraulic jack, an inverted triangle shaped wedge, or the like, which is preferably implemented by inserting the wedge into the perforated gap g of the core bit hole 110. After that, the inner core rock is crushed by pressing.

According to the second embodiment M2, as shown in FIG. 3B, the second step 20 of removing core rocks of the inner diameter of the core bit hole 110 may include: 110) drilling the first blasting hole 210 in the center and putting the charge 410 into the first blasting hole 210, and blasting the inside of the core bit hole 110 by blasting the first blasting hole 210 Characterized in that it may include.

This second embodiment can be carried out when the core rock is too hard or too large in diameter to perform the removal of the core rock through the first embodiment M1, even in the case of the second embodiment. The excavation surface can be excavated with vibrations (almost vibration-free vibrations).

According to the third embodiment M3, as shown in FIG. 3C, the second step 20 of removing the core rock of the inner diameter of the core bit hole 110 may include the core bit hole 110. Forming an insertion hole 120 in the center of the insertion hole, and inserting the hydraulic rod into the insertion hole 120, and removing the crack by removing the crack from the inside of the core rock using the hydraulic rod. Can be characterized.

In the third embodiment (M3), the hydraulic rod is preferably carried out in the form of pushing the core rock outward in the insertion hole 120, the first embodiment in that the core rock is cracked from the inside (c) M1), it is possible to remove the hard core rock than the first embodiment (M1).

In addition, FIG. 4 shows an embodiment in which the excavation surface B is divided into a first excavation surface Be and a second excavation surface Bi. As shown in FIG. 4, the excavation surface B is illustrated in FIG. It includes a first excavation surface (Be) formed in the rim and a second excavation surface (Bi) formed therein, the core bit hole 110 is provided on the first excavation surface (Be) as a key, More specifically, the core bit hole 110 is perforated at a predetermined interval along the first excavation surface Be.

The implementation of FIG. 4 is performed by selecting any one of the first to third embodiments or by combining two or more implementations, whereby the first excavation surface Be is linearly excavated by the core bit hole 110. After being removed, the second excavating surface Bi, which is inside thereof, is excavated afterwards.

In the further embodiment of FIG. 4, the excavation surface B is divided into the first excavation surface Be and the second excavation surface Bi. In the fourth embodiment M4 of the present invention, which will be described later, The blasting surface (B1) and the second blasting surface (B2) is divided into two, the name of the two different in the first embodiment (M1) and the third embodiment (M3) may not use the charge 410. It is to emphasize.

In a further embodiment of the second embodiment described above, the second to ninth blast holes 310, 320, 330, 340, 350, 360, and 370 provided with the first blasting hole 210. (380) will be described. (Hereinafter, the reference numerals of the second to ninth blast holes will be described as 310 to 380 for convenience of description.)

2, 4, and in particular with reference to Figure 7, the present invention (M) is a third step (30) which is the step of excavating the inside of the excavation surface (B) by removing the remaining portion of the excavation surface (B), The second to fifth blast holes 310, 320, 330, 340 are spaced at a predetermined interval around the first blast hole 210 to the second to fifth blast holes 310, 320, 330, 340 ) Is drilled to form a rhombus shape centering on the first blasting hole 210, and the sixth to ninth blasting holes 350, 360, 370, and 380 around the first blasting hole 210. Perforating to form a rectangular shape spaced apart by a predetermined interval, and drilling the second to fifth blasting holes 310 to 340 are located in the center of the adjacent blasting holes, respectively, and the second to ninth blasting holes (310 to 380) Injecting the charge 410, characterized in that it may comprise the step of drilling the excavating surface (B) by sequentially blasting the second to ninth blasting holes (310 ~ 380).

This further embodiment is the same as the principle and effect of the fourth embodiment (M4) of the present invention described later, will be described in more detail below.

5 to 8 relate to a fourth embodiment M4 of the present invention.

In particular, Figure 5 is a block diagram according to a fourth embodiment of the present invention, Figure 6 is a plan view of a fourth embodiment of the present invention, Figure 7 is a side view of a fourth embodiment of the present invention, Figure 8 is a Detailed description of the fourth embodiment.

Referring to the fourth embodiment (M4) with reference to this, the core of the fourth embodiment (M4) is the first blasting surface (B1) and the second blasting surface formed inside the excavation surface (B) ( B2), and the core bit hole 110 and the first to ninth blasting holes 210 and 310 to 380 are drilled at a predetermined interval along the first blasting surface B1.

Therefore, after the first blasting surface B1 is blasted and removed by the core bit hole 110 and the first to ninth blasting holes 210 (310 to 380), the second blasting surface B2 is formed therein. ) Is excavated.

The present invention M4 according to the fourth embodiment includes a step of pre-excavating the edge of the excavation surface (B), and then excavating the internal excavation surface afterwards, as shown in FIGS. 5 and 8. And the first to sixth processes 100, 200, 300, 400, 500, and 600. (See FIG. 5) The first to sixth processes 100 to 600 may include: It proceeds sequentially, and this process will be described in more detail with reference to the drawings for each process.

First to fifth processes (100 to 500) is a process of processing the edge of the excavation surface, the sixth step (600) is a process of excavating the remaining inner side of the excavation surface, the first to third embodiments Step 3 is a process corresponding to 30, and for convenience of explanation, the edge of the excavating surface B is named as the first blasting surface B1, and the remaining inside is named as the second blasting surface B2. The size and depth of the wavefront (B1) and the second blasting surface (B2) can be changed in various ways depending on the situation.

First, as shown in FIGS. 6 to 8, the first process 100 uses a core bit hole at a predetermined interval along the first blasting surface B1 formed at the edge of the excavation surface B. 110) is the process of drilling. This is a process corresponding to the first step 10 described above, and is characterized in that the core bit hole 110 is provided in plural numbers spaced apart by a predetermined distance along the center of the first blasting surface B1. 6)

Next, the second process 200 is a process of drilling the first blast hole 110 in the center of each core bit hole (110). This is to insert the charge 410 to be described later to blast the core bit hole 110 in the center to puncture the cylindrical core bit hole 110, located in the center of each core bit hole 110, the same in all directions It is to be able to transmit the blast force of the micro vibration.

Next, the third process 300 is a process of drilling the second to ninth blasting holes (310 ~ 380) around the first blasting hole (110).

Referring to the third process 300 in more detail, eight blasting holes (second to ninth blasting holes 310 to 380) are drilled around the core bit hole 110. The core shown in FIG. 7 is drilled. Referring to the core bit hole 110 among the bit holes 110, the second to fifth blasting holes 310 to 340 are spaced at a predetermined interval with respect to the first blasting hole 110. The shapes connecting the fifth blasting holes 310 to 340 are drilled to form a rhombus shape.

More specifically, the second and third blasting holes 310 and 320 are provided in a shape that is spaced apart from the core bit hole 110 by a predetermined distance from the core blasting hole 110 and faces each other on both sides. The fourth and fifth blasting holes 330 and 340 are drilled to face the first blasting hole 110 at a predetermined distance to the outside of the core bit hole 110 to face each other up and down.

Accordingly, the third blasting hole 320, the fifth blasting hole 340, and the second blasting hole 310 are sequentially drilled in the clockwise direction with respect to the fourth blasting hole 330, and when connected thereto, one rhombus shape is formed.

In addition, the sixth to ninth blasting holes 350 to 380 centered on the first blasting hole 110 are spaced at a predetermined interval to form a rectangular shape, and the second to fifth blasting holes 310 to the center of adjacent blasting holes. 340 are each drilled to be located.

More specifically, the sixth to ninth blasting holes 350 to 380 are respectively drilled at each corner of the diagonal direction around the first blasting hole 110, at which time the sixth blasting hole 350 and the seventh blasting hole 360 are formed. ) The center of the second blasting hole 310, the seventh blasting hole 360 and the eighth blasting hole 370, the fifth blasting hole 340, the eighth blasting hole 370 and the ninth blasting hole 380 In the third blasting hole 320, the fourth blasting hole 330 is provided at the center of the ninth blasting hole 380 and the sixth blasting hole 350, respectively.

That is, starting from the fourth blasting hole 330 and forming a large rectangular shape in the clockwise direction (centering on the first blasting hole 110), the ninth blasting hole 380, the third blasting hole 320, and the eighth blasting hole ( 370, the fifth blasting hole 340, the seventh blasting hole 360, the second blasting hole 310, and the sixth blasting hole 350, and the distances between the adjacent blasting holes are the same. When the charge 410 is blown up, the force can be transmitted evenly.

In the fourth process 400, the charge 410 is injected into the first to ninth blasting holes 210 and 310 to 380, and the blasting of the first blasting hole 110 blows up the inside of the core bit hole 110. It is a process.

More specifically, the first to ninth blasting hole 210, 310 ~ 380 is installed in the charge 410, at this time the amount of the charge 410 injected into the first blasting hole 110 is the remaining second to ninth blasting hole It is preferable that less than the amount of the charge 410 to be injected into (310 ~ 380).

The first blasting hole 110 is first blasted through the primer to the charged 410, and thus the inside of the core bit hole 110 is blasted and perforated in a cylindrical shape.

The fifth process 500 is a process of drilling the first blasting surface B1 of the excavation surface B by sequentially blasting the second to ninth blasting holes 310 to 380 after the fourth process 400.

In this case, the blasting holes are sequentially blasted from the second to ninth blasting holes (310 to 380), which is to blast in order from the blasting holes adjacent to the core bit hole 110, thereby improving the vibration and noise reduction effect. In addition, it is possible to prevent the spreading of the by-products, and to further advance the blasting.

In addition, the first blasting surface (B1) of the excavating surface is first blasted by the blasting process, vibration, noise, and the like due to the excavation process of the second blasting surface (B2) by the sixth process 600 on the ground outside the excavating surface It is possible to reduce the delivery of fly products and the like.

Furthermore, a part of the second to ninth blasting holes 310 to 380 overlaps with a portion of the adjacent second to ninth blasting holes 310 to 380, and accordingly, is located at the center along the second blasting surface B2. This is to form only one blasting hole between the adjacent first blasting hole 110 provided, thereby further improving the blasting effect.

In addition, although not shown in the drawings, when there is such a blasting process, the excavation work for discharging the blasted soil, etc. is to use a conventional equipment, such as an excavator, which will be omitted a specific description as one of the obvious processes.

On the other hand, as shown in Figure 7, each blasting hole 210, 310 ~ 380 is injected into the charge 410, when the rain or rain, when the construction site has a lot of moisture, the excavation surface (B) a large amount of moisture If the leachate flows into the blast hole in such a situation, the blasting may not be performed properly. In order to solve the problem, the present invention forms an airtight layer on top of the charge 410 so that the blasting of the charge is not affected by external factors.

That is, the present invention is characterized in that it is provided inside the blasting hole is provided on the top of the charge, it may further include a sealing layer formed by the injection and curing in the blasting hole of the coating agent. More preferably, it is provided at the uppermost end of each blast hole to be provided in the form of sealing each blast hole.

Such a sealing layer provides protection against impact damage, improved flame retardancy, improved manufacturability due to rapid curing, and improved water resistance through water repellent treatment, and is separated and removed from the blast hole by blasting force when blasting.

The coating composition of the present invention to provide the above effect, the binder resin 100 parts by weight, 1 to 10 parts by weight of isocyanate prepolymer, 1 to 30 parts by weight of polyester acrylate, methyl acetate (Methyl acetate) 30 to 60 parts by weight, 0.5 to 5 parts by weight of Azobis isobutyronitrile, 5 to 15 parts by weight of aluminum hydroxide, 1 to 5 parts by weight of dimethylaniline, and tetraethoxysilane (Tetraethoxysilane) 0.5 to 2.5 parts by weight.

For each structure, first, the binder resin is preferably made of a UV curing type, and the kind thereof is not particularly limited.

Next, an isocyanate prepolymer may be obtained by modifying a compound having two isocyanate groups by isocyanurate modification, trimetholpropane (TMP) modification, biuret modification, or the like, and a binder resin. It is preferable to use 1 to 10 parts by weight with respect to 100 parts by weight, the crosslinkability is lowered when used less than 1 part by weight, the crosslinkability is excessively increased when used in excess of 10 parts by weight so that the surface of the sealing layer There exists a problem that it becomes rough and the possibility of damage by a crack becomes high.

Next, polyester acrylate is used as a crosslinking agent together with the above-mentioned isocyanate prepolymer, and it is preferable to use 1 to 30 parts by weight based on 100 parts by weight of the binder resin. The surface of the layer is not formed cleanly, and when used in excess of 30 parts by weight, the crosslinkability is excessively increased and the surface of the sealing layer becomes rough.

Next, methyl acetate is added as an organic solvent to secure stable compatibility of the coating agent and provide solution polymerization, and it is preferable to use 30 to 60 parts by weight based on 100 parts by weight of the binder resin, 30 parts by weight When used less than the viscosity of the coating is excessively high flowability is worse, when used in excess of 60 parts by weight, there is a problem that the environmental degradation or severely violates environmental regulations.

Next, Azobis isobutyronitrile is used as an initiator for generating radicals, and 0.5 to 5 parts by weight is preferably used with respect to 100 parts by weight of the binder resin, and sufficient radicals when used below 0.5 parts by weight. If ions cannot be generated and used in excess of 5 parts by weight, the resulting radical ions lower the overall polymerization degree, resulting in a problem of deterioration of physical properties.

Next, aluminum hydroxide is added to prevent a specific combustion step in the course of the combustion of the hermetic layer, and preferably 5 to 15 parts by weight based on 100 parts by weight of the binder resin is used. When used, the flame retardant effect is insignificant, and when used in excess of 15 parts by weight, the economy is lowered compared to the flame retardant effect.

Next, dimethylaniline is added to aid the radical generation of the azobis isobutylnitrile described above, and preferably 1 to 5 parts by weight is used in 100 parts by weight of the binder resin, which is used in less than 1 part by weight. If it is not completely cured and used in excess of 5 parts by weight, black spots or corrosion may occur on the surface of the sealing layer.

Next, tetraethoxysilane is added in order to hydrolyze and condense to impart waterproofness and water repellency of the sealing layer and to improve antiseptic property, and 0.5 to 2.5 parts by weight of 100 parts by weight of the binder resin is preferably used. When the amount is less than 0.5 parts by weight, the waterproof, water-repellent and antiseptic improvement effects are insignificant, and when used in excess of 2.5 parts by weight, there is a problem that the workability is lowered.

Hereinafter will be introduced an embodiment of the sealing layer using the coating composition described above.

EXAMPLE

As the binder resin, 50 g of isocyanate prepolymer, 200 g of polyester acrylate, 500 g of methyl acetate, 30 g of azobis isobutylnitrile, 100 g of aluminum hydroxide, 30 g of dimethylanaline, and 20 g of tetraethoxysilane were added to 1 kg of epoxy acrylate oligomer. The mixture was stirred for about 1 hour to prepare a coating composition.

The coating composition thus prepared was applied to a test block (manufactured with cement), and then completely cured to form a sealing layer on the test block.

Example 1

Thereafter, the experiment of scraping the sealing layer through the scratcher having an irregular projecting portion and the experiment of repeatedly scratching the scratcher on the sealing layer did not occur, and the scratch and the sealing layer did not occur.

Example 2

In addition, as a result of an experiment for directly spraying the flame through the torch for 10 minutes, a slight soot occurred, but the sealed layer was not burned at all.

Example 3

In addition, after spraying water for 6 hours to the airtight layer, after removing the airtight layer and inspecting the internal invasion of the test block, no moisture was detected.

Through the above embodiments it can be seen that the sealing layer according to the present invention is excellent in protection, flame retardancy and waterproof.

The present invention described with reference to the accompanying drawings may be variously modified, changed, and replaced by those skilled in the art, and such modifications, changes, and substitutions should be construed as falling within the protection scope of the present invention.

M: No vibration excavation method using core equipment
M1 to M4: First to Fourth Embodiments of the Invention
10 to 30: first to third steps of the first to third embodiments
100 to 600: first to sixth processes of the fourth embodiment
B: excavation surface
Be: First Excavation Surface Bi: Second Excavation Surface
B1: first blasting plane B2: second blasting plane
110: core bit hole 210: first blasting hole
310 to 380: second to eight blast hole 410: charge

Claims (4)

Drilling a plurality of core bit holes at a predetermined interval on the excavation surface by using the core equipment;
Removing the core rock of the core bit hole inner diameter size; And
Excavating the inside of the excavated surface by removing the remaining portion of the excavated surface;
Vibration-free excavation method using a core device comprising a.
The method according to claim 1,
Removing the core rock of the core bit hole inner diameter size,
Inserting a press crusher between the drilled gaps of the core bit hole;
Pushing the press crusher inserted between the drilled gaps of the core bit hole; and
The vibration-free excavation method using the core equipment comprising the step of removing the core rock by pressing and crushing the core rock through the press-type crusher.
The method according to claim 1,
Removing the core rock of the core bit hole inner diameter size,
Drilling a first blasting hole in the center of each core bit hole; and
Injecting a charge into the first blasting hole, and blasting the inside of the core bit hole by blasting the first blasting hole;
Excavating the inside of the excavation surface by removing the remaining portion of the excavation surface,
The second to fourth blasting holes are spaced at a predetermined interval around the first blasting hole to drill the shapes of the second to fourth blasting holes to form a rhombus shape around the first blasting hole, and the first blasting hole Drilling the sixth to ninth blasting holes at a predetermined interval to form a quadrangular shape, and drilling the second to fourth blasting holes in the center of adjacent blasting holes, respectively;
Injecting a charge into the second to ninth blasting hole, and blasting the second to ninth blasting hole sequentially to drill the excavation surface, characterized in that the vibration-free drilling method using the core equipment.
The method according to claim 3,
The excavation surface includes a first blasting surface formed on the rim and a second blasting surface formed therein,
The core bit hole and the first to ninth blasting holes are drilled at regular intervals along the first blasting surface,
The amount of the charge flowing into the first blasting hole is provided less than the amount of the charge flowing into the second to ninth blasting hole,
The first to ninth blasting hole is continuously formed along the edge of the excavation surface, vibration-free excavation method using the core equipment, characterized in that the blast holes adjacent in the longitudinal direction of the edge is formed partially overlapping.

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