KR101016156B1 - Fire protecting method of concrete structures using high heat resistant mortar - Google Patents

Abstract

PURPOSE: A method of a concrete structure using refractory mortar is provided to improve constructability and workability by mixing/pumping device. CONSTITUTION: A method of a concrete structure using refractory mortar comprises: a step of washing a concrete structure; a step of applying an adhesive material to the concrete structure; a step of mixing the refractory mortar with a mixture solution by a mixing/pumping device; a step of pumping-constructing the refractory mortar to the concrete structure; and a step of applying a refractory coating material to cure. The refractory mortar contains 27-63wt% of binding material, 1-3 wt% of fiber, 0.01-1 wt% of melamin plasticizer, and 33-71 wt% of aggregate. The binding material contains 80-90 wt% of cement, 1-10 wt% of expanding agent, and 0.5-10 wt% of anhydrite.

Description

Fire Protection Method of Concrete Structures using High Heat Resistant Mortar}

The present invention relates to a fireproofing method of a concrete structure using a refractory mortar, by mixing the refractory mortar uniformly in the mixed water by a mixing pumping device to form a refractory mortar excellent in fire resistance and insulation, and by the pumping / spraying of the concrete The present invention relates to a fireproofing method for concrete structures using refractory mortar capable of cross-sectional recovery of structures.

The recent construction of many underground structures has raised concerns about fires, including the Busan Freezer Warehouse Fire (1998) and the Daegu Subway Fire (2003), as well as France's Mont Blanc Tunnel Fire (1990) and Denmark. The number of large-scale fires has increased, including the Gritbelt tunnel fire (1994), the English and Firewood Tunnel fire (1996), the Gotthard Tunnel fire (2001) and the Spanish Tower Fire (2005).

Unlike other civil engineering structures that are exposed to the outside, if a fire occurs inside a closed tunnel, it is likely to lead to a catastrophic disaster and tunnel collapse, and these concerns are becoming more realistic with the recent expansion of tunnels. In particular, unlike NATM (New Austrian Tunneling Method) tunnels, which are constructed with shotcrete and then second-lined, the damage caused by fire is more likely to occur in shield tunnels, submerged tunnels, and open tunnels where concrete linings act as structures without shotcrete. In addition to damage, high-heat breakage of the concrete lining is more likely to lead to the collapse of the tunnel.In this case, not only large catastrophes but also socially-based transportation networks are paralyzed for a long time, and huge construction costs are required to restore them. Get mad.

In contrast, in advanced countries such as Europe and Japan, interest in fire protection facilities such as fire detection facilities, minimization facilities, and flue gas installations for tunnel disaster prevention and interest in tunnel fire safety for tunnel concrete have been increasing. .

In the case of fire, the change of the physical properties of concrete according to the temperature change, dehydration starts around 250 ℃, calcium hydroxide is decomposed at 450 ~ 500 ℃, crystal moisture is released and hydrate starts to be destroyed. Decomposition of calcium carbonate, complete dehydration of cement paste occurs at 900 ° C.

When the concrete is subjected to high heat, physical properties such as compressive strength and elastic modulus are deteriorated. The higher the temperature of the concrete, the worse the degree of deterioration. In addition, when the concrete is exposed to high temperature, the surface layer is peeled off, the thermal explosion phenomenon occurs. Such a thermal explosion is a phenomenon in which concrete is temporarily destroyed due to the expansion of water as the water vapor inside the concrete becomes hot due to high heat, and may cause severe damage and rapid collapse of the tunnel concrete lining or building concrete structure. . In the case of a fire caused by a flammable material or a large-scale fire, it takes a long time to extinguish and causes a great damage because the damage range is large.

As a countermeasure against fire for such a large fire, there is a method of constructing the concrete lining itself as a fireproof material and a method of protecting the concrete lining in case of fire by installing a protective material having fire insulation on the existing concrete lining. And in terms of effect, the method of forming a protective lining by spraying a certain thickness of fire-resistant insulation mortar on the concrete lining is efficient and has been recently used for tunnel disaster prevention in Europe, Japan and the like.

Usually, as a material of the concrete fireproof lining, a special composition has been developed and used, which is longer in heat resistance and fire resistance than steel fireproof coating materials such as cement or gypsum. In particular, tunnel fires, unlike general fires, are difficult to extinguish by general fire extinguishing equipment due to oil, flammables, etc., and the temperature rises rapidly after a fire, and usually rises to 1200 ~ 1300 ℃. Since it takes about 2 hours, the fireproof lining material for tunnels is required to have a much higher fire resistance and exhibit long-term durability at high temperatures than ordinary building fireproof lining materials which usually exhibit short-term heat resistance at temperatures of 1000 ° C. or lower.

An object of the present invention is to provide a refractory mortar capable of forming a refractory mortar having an excellent strength by increasing the amount of fiber added and having excellent fire resistance and heat insulation.

Another object of the present invention is to produce a high-quality refractory mortar of a uniform mixing state in the shortest time by the mortar mixing pumping device, and to pump and spray it optimally to improve the workability and workability of concrete using refractory mortar It is to provide a fireproofing method of the structure.

Another object of the present invention is to improve the adhesion of the refractory mortar and the adhesion of the inorganic refractory coating material and the refractory mortar to the concrete structure, through the sequential coating finish treatment of the adhesive, refractory mortar, inorganic refractory coating material, and improved fire and thermal insulation It is to provide a fireproofing method of a concrete structure using a refractory mortar.

It is still another object of the present invention to provide a fireproofing method for a concrete structure using refractory mortar, by applying a refractory mortar and an inorganic refractory coating material having similar physical properties, integrating the refractory mortar and an inorganic refractory coating material, and providing excellent durability. .

Still another object of the present invention is to provide a fireproofing method for a concrete structure using refractory mortar, which can continuously perform mixing, conveying, and pumping operations of refractory mortar by preventing jamming caused by fibers when mixing refractory mortar.

Another object of the present invention is to mix and pump the refractory mortar containing fibers in a large capacity to improve the working speed, and fireproof of the concrete structure using the refractory mortar, which can be easily performed even for a large area concrete structure It is to provide a method.

The refractory mortar of the present invention includes 27 to 63 wt% of binder, 1 to 3 wt% of fiber, 0.01 to 1 wt% of melamine-based fluidizing agent, and 33 to 71 wt% of aggregate, and the binder is 80 to 90 wt% of cement and 1 to 10 wt% of expander. And anhydrous gypsum 0.5 to 10 wt%.

The present invention is a treatment step of chipping the surface of the concrete structure; A washing step of washing the concrete structure under high pressure water after the treatment step; An adhesive material applying step of applying an adhesive to a repair part of the dried concrete structure after the washing step; After applying the adhesive, the cross-sectional recovery step of pumping the refractory mortar by the mixing pumping device; The coating step of curing curing the refractory coating material on the surface of the fire-resistant mortar.

As described above, the present invention is to automatically produce a refractory mortar containing a large amount of fibers, so that it is lightweight, has excellent compressive strength and durability, and can improve fire resistance and heat insulation.

In addition, the present invention is to apply an adhesive to the surface of the structure, and to apply a refractory mortar containing a greater amount of fibers to the mixing pumping device, and then to finish the coating of the refractory coating material, the structure and the fire by the adhesive Increasing the adhesive strength of the mortar, and the integration of the refractory mortar and the refractory coating material due to similar physical properties, it is possible to prevent the falling off of the recovered portion, improve the work performance, and facilitate the mortar operation.

In addition, the present invention is economical through the convenience of construction of the refractory mortar and the reduction of air and labor costs, it is possible to maintain excellent construction quality.

In addition, the present invention can be continuously produced and pumped a large amount of refractory mortar, there are many effects, such as to facilitate large cross-sectional work.

1 is an exemplary view showing a configuration of a mixing pumping device
Figure 2 is an exemplary view showing a material supply unit configuration of the mixing pumping device
3 is an exemplary view showing the configuration of a first mixing unit of the mixing pumping apparatus;
4 is a perspective view and a side view illustrating the configuration of a first mixing shaft of a mixing pumping apparatus;
5 is an exemplary view showing the configuration of a second mixing unit of the mixing pumping apparatus;
6 is a side view illustrating the configuration of a second mixing shaft of a mixing pumping device;
7 is a side view illustrating the configuration of a movable carriage of the mixing pumping apparatus;
8 is an exemplary side view showing a movable carriage operating state of the mixing pumping device;
9 is an exemplary block diagram according to the present invention.

The refractory mortar of the present invention includes 27 to 63 wt% of binder, 1 to 3 wt% of fiber, 0.01 to 1 wt% of melamine-based fluidizing agent, and 33 to 71 wt% of aggregate, and the binder is 80 to 90 wt% of cement and 1 to 10 wt% of expander. And anhydrous gypsum 0.5 to 10 wt%.

The fiber is used by mixing at least one of EVA powder, wood fiber, polypropylene fiber, the aggregate is used No. 5 and No. 6.

The refractory mortar made as described above is mixed with the mixed water to form a mixing refractory mortar having fluidity. Such refractory mortar has 8-day compressive strength of 40.0 MPa or more, flexural strength of 8.0 MPa, and adhesion strength of 1.0 MPa or more. The thermal conductivity is to be 1.0 kcal / mh ° C. or less.

Hereinafter, the fireproofing method of the concrete structure using the refractory mortar of the present invention will be described in detail with reference to the accompanying drawings.

Figure 9 shows a block diagram according to the present invention, the present invention is first applied to the adhesive material having excellent adhesion to the portion of the concrete structure is removed and washed foreign matter, and then cross-section using a refractory mortar It is a method of recovering and coating the inorganic fireproof coating material thereon and finishing it, which has a superior fire resistance performance compared to the existing method.

That is, the present invention the processing step of chipping the surface of the concrete structure;

A washing step of washing the concrete structure under high pressure water after the treatment step;

An adhesive material applying step of applying an adhesive to the dried concrete structure after the washing step;

After applying the adhesive, the cross-sectional recovery step of mixing the refractory mortar with the mixed water by a mixing pumping device to form a mixing refractory mortar, and pumping the mixing refractory mortar to the concrete structure coated with the adhesive material;

The coating step of curing by applying a refractory coating material on the surface of the construction of the refractory mortar.

The adhesive coating step is a step of applying an adhesive made of an emulsion of a mixture of acrylic and silicone on the surface or the repair portion of the structure by a roller, brush, etc., the adhesive has a solid content of 30wt%, viscosity of 100cps or less, pH 8.5 do.

That is, the adhesive material is an emulsion in which acrylic and silicone are mixed, and has an excellent adhesion since the main polymer of acrylic is -O-S i -O-which is a siloxane. In addition, the acrylic silicone emulsion is easily penetrated into the concrete by low molecular weight, and forms a thin film by forming a crosslink between the alkali component and the acrylic molecule on the concrete surface, thereby more effectively penetrating moisture from the outside You can block. Moreover, since it has a high adhesion by crosslinking with the concrete surface, it is possible to continuously maintain the durability performance by improving the adhesion with the refractory mortar applied in the subsequent process.

The recovering step is a refractory mortar is a mass production of refractory mortar by mixing with the mixed water by mixing the refractory mortar into the mixing pumping device, and pumped and applied to the concrete structure, the refractory mortar is 27 ~ 63wt% binder, fiber 1 3 wt%, melamine fluidizing agent 0.01-1 wt%, aggregate 33-71 wt%, the binder includes 80-90 wt% cement, 1-10 wt% expander, 0.5-10 wt% anhydrous gypsum, and the fiber One or more of EVA powder, wood fibers, polypropylene fibers are mixed and used, and the aggregate uses No. 5 and No. 6.

In addition, the supply of the mixed water may be quantitatively supplied by the mixing pumping device according to a known or well-known water ratio, or may be adjusted and supplied at the operator's discretion, and thus detailed description thereof will be omitted.

The refractory mortar is mixed with mixed water in a mixing pumping apparatus and formed of a mixed refractory mortar having fluidity. The refractory mortar has 8-day compressive strength of 40.0 MPa or more, flexural strength of 8.0 MPa, and adhesion strength of 1.0 MPa or more. The thermal conductivity is 1.0 kcal / mh ° C. or less.

The recovery step as described above is a step of injecting refractory mortar into the material supply unit of the mixing pumping device;

A supply step of supplying the refractory mortar to a first mixing part connected to a material supply part;

A stirring step of mixing the refractory mortar supplied to the first mixing unit with the mixed water while first mixing by the first mixing shaft to form a mixing refractory mortar;

A transfer step of quantitatively transferring the mixing refractory mortar from a first mixing unit to a second mixing unit by a transfer pump;

A mixing step of transferring the mixing refractory mortar to the main pump while remixing the mixing refractory mortar by the second mixing shaft in the second mixing unit;

It consists of a pumping step of mixing and pumping the mixing refractory mortar transferred to the main pump.

1 to 8, the mixing pumping apparatus includes a material supply unit 1 into which refractory mortar is input, a mixed water supply unit 6 for supplying mixed water, and a first mixing unit 2 for mixing refractory mortar. ), A transfer pump (3) for conveying the mixed refractory mortar made of refractory mortar and mixed water, a second mixing part (4) for remixing the refractory mortar for mixing, the main pump (5) for pumping the mixed refractory mortar, and materials And a control box 7 for controlling the supply unit, the mixed water supply unit, the first mixing unit, the transfer pump, the second mixing unit, and the main pump.

The material supply unit 1 is to supply the refractory mortar in the form of powder to the first mixing unit 2 in a constant manner, referring to FIG. The hopper 14 which communicates with the 1 mixing part 2, and the rotary conveyor 12 installed in this hopper 14 and rotated by the supply drive motor 11 are included.

In order to quantitatively supply the refractory mortar and adjust the supply amount as necessary, the rotary conveyor 12 includes a spacer 13 disposed radially like a watermill on a central inclined surface of the hopper 14. In addition, a supply passage 15 communicating with the first mixing unit 2 is formed at an upper side of the rotary conveyor 12.

That is, according to the rotation speed of the rotary conveyor 12 by the driving motor 11 for supply in the state where the refractory mortar is loaded inside the hopper 14 through the silo or through the inlet by the operator, the first mixing part ( The supply amount of the refractory mortar supplied toward the supply passage 15 in communication with 2) is adjusted, and eventually, when rotating at a predetermined constant speed, the refractory mortar is quantitatively transferred toward the first mixing unit 2.

By the rotation of the rotary conveyor 12, the refractory mortar in the hopper 14 is transported to the upper slope of the hopper 14 while being loaded in each of the spacer plates 13 as a water mill, and then through the supply passage 15. 1 It is supplied dropping to the mixing section (2). If the refractory mortar supplied to the first mixing part 2 is over-supplied, that is, refractory mortar is accumulated above the height of the supply passage 15, the overflowing refractory mortar overflows with the hopper due to the continuous rotation of the rotary conveyor 12. 14) is loaded back.

The first mixing unit 2 is a place for mixing simultaneous mixed water and refractory mortar for conveying the refractory mortar supplied from the material supply unit 1 downward, as shown in FIGS. 3 and 4, the material supply unit (1) and the mixing hopper 22 which is communicated by the supply passage 15, the mixing drum 23 which is connected to the lower end of the mixing hopper 22, and the mixing hopper 22 and the mixing drum 23 It includes a mixing shaft 24 that is rotated by the first drive motor 21 about the rotation axis 241 is disposed in the center of the. In addition, one side of the mixing drum 23 is formed with a mixed water inlet 231 connected to the mixed water supply (6).

The mixing shaft 24 includes a screw blade 244 and the stirring shaft 242. Specifically, the mixing shaft 24 according to the embodiment includes a rotating shaft 241 connected to the first driving motor 21 disposed on the mixing hopper 22 and extending to the lower end of the mixing hopper 22; A stirring shaft 242 branching at least two or more adjacent to the inner diameter of the mixing drum 23 at the end of the rotating shaft 241 to the lower end of the mixing drum 23; A support wing 243 connecting the lower end of the stirring shaft 242; One side is coupled to the upper portion of the stirring shaft 242 and screw blades 244 spirally adjacent to the inclined inner surface of the mixing hopper 22 is connected to the mixing drum 23;

Although the stirring shaft 242 shown as an embodiment has a form divided into two from the rotation shaft 241, such a stirring shaft 242 may take a form divided into three or more while maintaining an equal interval.

In addition, although one screw blade 244 is shown as an embodiment, the screw blade 244 may also be arranged in two or more while maintaining the same spacing.

The screw blade 244 is formed in a spiral shape from the lower fixing portion to the free end of the upper end to correspond to the height of the inclined surface of the mixing hopper 22 to form a spiral shape, as shown in FIG. 360 degrees).

Thus, the refractory mortar introduced into the interior from the supply passage 15 formed on one side of the upper side of the mixing hopper 22 is introduced into the lower mixing drum 23 by the screw blade 244 rotating at high speed, and thus the mixing drum 23 The refractory mortar introduced into the mixture is primarily mixed with the mixed water and the stirring shaft 242 supplied to one side of the mixed water inlet 231.

In addition, the screw blade 244 is disposed in close proximity to the inclined inner surface of the mixing hopper 22, blocking the refractory mortar is fixed to the inner wall of the mixing hopper 22, and uniformly toward the lower mixing drum 23 Transfer the refractory mortar at one speed.

The mixed water supply unit 6 supplies a fixed amount of mixed water toward the mixed water inlet 231 formed at one side of the mixing drum 23 of the first mixing unit 2, and a mixed water tank (not shown). And a supply pump 61 and a hydraulic pressure sensor 62 for detecting a supply amount.

The mixed water supply unit 6 is directed toward the mixed water inlet 231 due to the discharge pressure set in advance according to the supply amount of the refractory mortar supplied to the first mixing unit 2 through the material supply unit 1. Will be supplied. The amount of the mixed water supplied is to maintain the discharge pressure of the mixed water which is set in advance through the water pressure sensor 62 presented as an embodiment, and the pressure state of the above or below pressure, that is, the amount of the mixed water supplied is changed or stopped. In this case, to stop the operation of the equipment from the operation signal of the control box 7 to be described later. In addition, the amount of the mixed water currently supplied to the mixing drum 23 of the first mixing unit 2 may be easily checked by the worker during the operation through the gauge 63.

The transfer pump 3 is installed between the lower end of the mixing drum 23 and the second mixing unit 4, and the refractory mortar mixed by the first mixing unit 2 in the first mixing unit ( 4) to provide a constant supply. That is, the transfer pump 3 passes through a predetermined first mixing process (set differently depending on the blending material) in the first mixing unit 2, and then supplies the refractory mortar to the second mixing unit 4. In order to maintain a uniform mixing state of the primary mortar supplied to the second mixing unit (4). The feed amount of the first mixed mixing refractory mortar conveyed by the transfer pump 3 is set to be smaller than the refractory mortar conveyance amount by the material conveying unit 1 so that only the mixing refractory mortar having sufficient primary mixing is completed. 2 to the mixing section (4). In addition, if the operation of the lower second mixing unit 4 is stopped in the situation where the mixing mixing mortar mixed primarily in the first mixing unit 2 is present, the transfer pump 3 stops the operation and the primary mixing It serves to block the mixing of the refractory mortar of the first mixing unit 2 falling to the second mixing unit (4).

The second mixing unit 4 mixes the first mixed mixing refractory mortar supplied through the first mixing unit 2 and the transfer pump 3 again, and mixes the refractory mortar toward the front main pump 5. 5 and 6, the horizontal mixing drum 42 and the lower end (outlet) of the transfer pump 3 communicate with each other in the horizontal direction, and the mixing drum 42 A second mixing shaft 44 is disposed in the center and rotated by the second driving motor 41.

The second mixing shaft 44 has a rotating shaft 441 arranged in the center of the mixing drum 42 and a twist type stirring blade provided on the rotating shaft 441 with respect to the feeding direction of the mixing refractory mortar. 442.

This twist type stirring blade 442 is bent in a spiral from the one end coupled to the rotation shaft 441 toward the opposite direction of the main pump 5, and the other end is a free end, the rotation shaft ( It is preferable that the rotation angle, ie, the number of turns, of one free end from the other fixed end about 441 is formed around one wheel (360 degrees).

The mixing shaft 44 including the twisted stirring blade 442 is generally the central portion of the mixing drum 42 close to the rotating shaft 441, unlike the existing blades that maintain a straight shape perpendicular to the mortar's conveying direction. It is possible to generate an even rotational force about the edge of the mixing drum 42 far from the rotational axis 441 and the space between the wing and the wing with respect to the axial direction, so that the mixing drum 42 can be uniformly mixed with the mortar. Can be.

In addition, the twist type stirring blade 442 satisfies the shape that can minimize the phenomenon that the mortar mass is deposited on the wing surface. In particular, in the case of fiber reinforced mortar having a high deposition rate, it is possible to minimize the deposition phenomenon generated in the stirring blades despite the long time use.

In addition, the twisted stirring blade 442 activates the vortex to increase the circulation action even in the mortar region that is not in direct contact with the mixing shaft, thereby satisfying a uniform mixing ratio for the entire mortar in the mixing drum 42.

In addition, the twist-type stirring blade 442 as described above can minimize the mortar space that can be stagnant due to the lack of rotational force in the conveying direction, thereby satisfying a stable feed rate and feed amount of mortar toward the front main pump 5.

On the other hand, the upper one side of the mixing drum 42 is provided with a quantity sensor 45 to detect the presence and amount of mortar in the mixing drum 42.

By providing the quantity sensor 45 as described above, the driving of the second drive motor 41 is operated only when the mixing refractory mortar in the mixing drum 42 is supplied, thereby reducing unnecessary operation of the second drive motor 41. . In addition, if the mortar in the mixing drum 42 is excessively supplied, the operation of the apparatus is ended in an emergency, and the amount of mortar is maintained at a level such that uniform mortar mixing can be ensured in the mixing drum 42 at all times.

The quantity detecting sensor 45 is sufficient to be disposed on the mixing drum 42 to detect the contact of the mortar, and may be used in various other forms.

The main pump 5 is coupled to the front outlet of the second mixing section 4 and through the first and second mixing sections 2 and 4 through an injector (not shown) connected to the front. The final mixed mortar is supplied at high pressure.

The control box 7 is connected to the above-described material supply unit 1, mixed water supply unit 6, the first mixing unit 2, the transfer pump 3, the second mixing unit 4 and the main pump (5). In order to control the operation of each part, the control box 7 is basically provided with an operation panel for operation such as on / off, output adjustment and emergency stop of the driving part provided in each part, and the operation of each part as necessary. A display window for checking the status and control, and a lamp, a buzzer, etc. may be further provided to easily check the abnormality of each part.

Further, preferably, the operation panel of the control box 7 of the present invention may include a pattern setting mode in which the driving conditions of the respective parts of the refractory mortar powder to be used are preset. That is, the operator can easily complete the initial setting of the equipment by simple operation from the DB for each pattern that presets the various mixing ratios, the recommended mixing time, and the transfer pump pressure state for the refractory mortars of each type that are already used in various ways.

When the refractory mortar used in this way is determined, the drive unit for each part, that is, the drive motor 11 for refractory mortar supply, the first drive motor 21 for primary mixing, the mixed water supply pump 61, the transfer pump 3 The outputs of the second drive motor 41 and the main pump 5 for the secondary mixing are determined, from which the mixing and pumping of the refractory mortar and the mixed water are automatically performed.

In addition, as described above, when the quantitative supply of the mixed water is not performed from the water pressure sensor 62 which detects the mixed water supply of the mixed water supply unit 6 and the amount of supply in real time, the operation of the equipment is stopped by emergency. 2 The mortar supply in the mixing drum 42 is received in real time through the water level sensor 45 provided in the mixing unit 4 so that the mortar is not present (when the refractory mortar powder is consumed in the material supply unit) or is excessively supplied. In this state, the operation of the equipment is stopped in an emergency, and the operator is notified through the display means such as a display window, a lamp, and a buzzer.

On the other hand, referring to Figures 7 and 8, the mortar mixing pumping device according to the present invention, each part is collectively mounted so as to improve the work efficiency even in the mobility and the narrow working space or a small number of people (one person) And a carriage 8 having a moving means. In addition, such a carriage 8 is provided with detachment means for each part to be mounted, so as to provide convenience of cleaning, maintenance, and maintenance for each part.

That is, the carriage 8 includes a frame body 81 having a moving means 811 (wheel); It is coupled to the upper surface of the center of the frame body 81, the material supply unit 1 and the first mixing unit 2 disposed in front of the material supply unit 1 and disposed on the lower end of the first mixing unit (2) A support frame 82 for supporting the second mixing unit 4 to be formed; And an auxiliary frame 83 coupled to the rear end of the frame body 81 to support the control box 7 and the mixed water supply part 6.

At this time, by combining the auxiliary frame 83, which is the control box 7 and the mixed water supply unit 6 with the carriage 8 and the detaching means 91, one worker to the work site of the device In addition to being easy to move, the mortar is kept in a position where the control box 7 can be easily observed during the spraying operation so that the operator can easily check and cope with the driving state of the device by the control box 7 during the operation.

Demounting means 91 of the auxiliary frame 83 according to an embodiment of the present invention, the mounting groove 913 which is seated on the support rod 912 formed on the rear end of the frame body 81, and the support frame 82 A locking clasp 915 is formed at the front end to which the hook 914 formed at the rear end is formed, and a separate auxiliary wheel 831 and a cradle 832 are integrally formed and separated from the frame main body 81 so as to be freely moved. It is to facilitate.

Mixing pumping device made as described above, refractory mortar formed using refractory mortar containing 27 to 63 wt% of binder, 1 to 3 wt% of fiber, 0.01 to 1 wt% of melamine-based fluidizing agent, and 33 to 71 wt% of aggregate, and pumping of refractory mortar The structure through the cross-sectional recovery operation is to be performed simultaneously and continuously.

The coating step is a step of integrating the refractory mortar and the refractory coating material by applying the refractory coating material before the curing of the refractory mortar, the refractory coating material is 10 to 55wt% white lime, 40 to 80wt% defoamer 1 to 3wt%, pigment 0.01 It contains -1, 0.1-6 wt% of hollow aggregates.

The hollow aggregate is a light aggregate having a spherical and hollow form of a ping pong ball, and the active ingredient contains _{27 to 33} wt% of Al ₂ O ₃ , 55 to 65 wt% of SiO ₂ , and 6 wt% of Fe ₂ O _3. It has chemical composition features, including physical density, 0.6 ~ 0.85g / cc, physical conductivity of 0.11 ~ 1.0 kcal / mh ℃, has a strength of 105 ~ 210kg / ㎠.

The refractory coating material is coated on the refractory mortar as an inorganic ceramic paint, and since the refractory coating material has a thermal expansion coefficient and a dry shrinkage similar to that of the refractory mortar, it is excellent in adhesion to the refractory mortar, excellent in durability, and compressive strength. 30.0 MPa or more, adhesion strength of 1.0 MPa or more, and thermal conductivity of 1.0 kcal / mh ° C. or less.

The present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by any person having ordinary skill in the art without departing from the gist of the present invention claimed in the claims. Of course, such changes will fall within the scope of the claims.

(1): Material supply unit (11): Drive motor for supply
(12): rotary conveyor (13): spacer
(14): Hopper (2): first mixing section
(21): first drive motor (22): mixing hopper
(23): mixing drum (24): first mixing shaft
(242): stirring shaft (244): screw blade
(3): transfer pump (4): second mixing part
(41): second drive motor (42): mixing drum
(44): second mixing shaft (442): twisted stirring blade
(45): quantity sensor (5): main pump
(6): mixed water supply part 61: supply pump
(62): Hydraulic pressure sensor (for supply quantity detection) (7): Control box
(8): carriage (83): auxiliary frame
(91) Demounting means

Claims (7)

delete delete Washing the high pressure water to wash the concrete structure;
An adhesive material applying step of applying an adhesive to the dried concrete structure after the washing step;
A cross-sectional recovery step of mixing the refractory mortar with the mixed water by a mixing pumping apparatus to form a refractory mortar, and pumping the refractory mortar onto the concrete structure to which the adhesive is applied;
It includes; coating step of curing by applying a refractory coating material on the surface of the fire-resistant mortar
The refractory mortar includes 27 to 63 wt% of binder, 1 to 3 wt% of fiber, 0.01 to 1 wt% of melamine-based fluidizing agent, and 33 to 71 wt% of aggregate,
The binder is refractory method of the concrete structure using refractory mortar, characterized in that containing 80 to 90wt% cement, 1 to 10wt% expansion material, 0.5 to 10wt% anhydrous gypsum.
delete The method of claim 3,
The mixing pumping device includes a material supply unit 1 into which refractory mortar is input, a first mixing unit 2 connected to the material supply unit and mixing refractory mortar, and a mixed water supply unit supplying mixed water into the first mixing unit ( 6), a transfer pump (3) connected to the first mixing unit to transfer the mixing refractory mortar made of refractory mortar and mixed water, and remixing the refractory mortar connected to the first mixing unit and transferred by the transfer pump. The second mixing unit 4, the main pump 5 connected to the second mixing unit to pump the mixing refractory mortar, and the material supply unit, the mixed water supply unit, the first mixing unit, the transfer pump, the second mixing unit, and the main Fireproof method of a concrete structure using a refractory mortar, characterized in that it comprises a control box (7) for controlling the pump. The method of claim 3,
The refractory coating material is a refractory method of a concrete structure using a refractory mortar, characterized in that it comprises a white cement 10 ~ 55wt%, limestone 40 ~ 80wt%, antifoaming agent 1 ~ 3wt%, pigment 0.01 ~ 1, hollow aggregate 0.1 ~ 6wt% .
The method of claim 3,
The adhesive material has a solid content of 30wt%, viscosity of 100cps or less, pH 8.5,
The refractory mortar has 8 days of compressive strength of 40.0 MPa or more, flexural strength of 8.0 MPa, adhesion strength of 1.0 MPa or more, and thermal conductivity of 1.0 kcal / mh ° C. or less.
The refractory coating material has a compressive strength of 30.0 MPa or more, adhesion strength of 1.0 MPa or more, and thermal conductivity of 1.0 kcal / mh ° C. or less.

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