KR20240026817A - Nozzle device for discharging concrete and construction method using the same - Google Patents

Abstract

A 3D printing nozzle device for construction including a plurality of nozzles for discharging rapid hardening concrete and concrete for internal pouring, respectively, and a construction method using the same are provided. The 3D printing nozzle device for construction includes a first concrete nozzle and a second concrete nozzle that are separated from each other; a screw disposed within the first concrete nozzle; and a vibration member disposed within the first concrete nozzle.

Description

Nozzle device for discharging concrete and construction method using the same {NOZZLE DEVICE FOR DISCHARGING CONCRETE AND CONSTRUCTION METHOD USING THE SAME}

The present invention relates to a nozzle device for discharging concrete and a construction method or construction method using the same. In detail, it relates to a 3D printing nozzle device for construction including a plurality of nozzles for discharging rapid hardening concrete and concrete for internal pouring, respectively, and a construction method using the same.

Concrete refers to a mixture of cement, water, and aggregate such as sand or gravel, or a structure using the same. Concrete has high compressive strength and is the main structural material for various construction and civil engineering purposes.

Concrete, which is initially in a dough state, hardens over time as a hydration reaction between cement and water occurs. Therefore, concrete construction is generally carried out by installing a form in the shape of a wall or slab, pouring dough-like concrete into the form space, curing the concrete for a predetermined period of time, and then dismantling the form. However, general concrete construction such as the above takes a long time and has the problem of requiring a lot of materials and construction costs, such as installing and dismantling the form.

For this reason, a construction method that discharges concrete composition through a nozzle, such as a 3D printer, has been proposed.

KR 10-2227820 B1 KR 10-1911404 B1 KR 10-1616306 B1

In general, concrete is not used alone as a structural material, but rather is used as reinforced concrete with bar-shaped rebar inserted into it. Concrete materials have high compressive strength but are vulnerable to tensile strength, so they are used as structural materials with both high compressive and tensile strengths by reinforcing steel bars with high tensile strength inside the concrete.

Meanwhile, concrete compositions used in architectural or construction 3D printing facilities are used by mixing admixtures such as accelerating agents so that they can be discharged and cured in a three-dimensional space immediately without installing a formwork. In other words, curing must proceed quickly upon discharge so that the discharged concrete structure can maintain its shape and be completely hardened without collapsing even without a formwork.

Due to the characteristics of the concrete composition of the 3D printing method as described above, there is a problem in that it is not easy to implement reinforced concrete under the architectural 3D printing system. These problems, especially in conjunction with mandatory seismic design regulations, are preventing the commercialization of 3D printing construction systems. In Korea, earthquake-resistant design is mandatory for buildings of a certain size or larger in the Building Act, Enforcement Decree of the Building Act, and rules on structural standards for buildings. However, it is very difficult to satisfy earthquake-resistant design conditions without reinforced concrete.

In addition, the concrete composition used in 3D printing has very low fluidity so that hardening proceeds simultaneously with discharge. Therefore, it is important to configure the nozzle device so that the concrete composition is in a fluid state without hardening and is then smoothly discharged.

Accordingly, the problem to be solved by the present invention is to provide a 3D printing nozzle device for construction that can discharge different types of concrete compositions.

Another problem to be solved by the present invention is to provide an architectural 3D printing device or 3D printing system including the architectural 3D printing nozzle device.

Another problem that the present invention seeks to solve is to provide a method of building or constructing a structure using the 3D printing system.

Another problem to be solved by the present invention is to provide a structure with excellent durability constructed by the above method.

The problems of the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the description below.

A 3D printing nozzle device for construction according to an embodiment to solve the above problem includes a first concrete nozzle and a second concrete nozzle that are separated from each other; a screw disposed within the first concrete nozzle; and a vibration member disposed within the first concrete nozzle.

The first concrete nozzle and the second concrete nozzle may be configured to slide each other in an up and down direction.

In addition, the size of the discharge port of the first concrete nozzle is smaller than the size of the discharge port of the second concrete nozzle, the first concrete nozzle is a nozzle for discharging rapid hardening concrete, and the second concrete nozzle has a viscosity higher than that of the rapid hardening concrete. It may be a nozzle for low concrete discharge.

The rapid hardening concrete is a binder containing cement, fly ash, and silica fume, and, relative to the weight of the binder, 65 wt% to 74 wt% of cement, 18 wt% to 22 wt% of fly ash, and 7.0 wt% to 13 wt% of silica fume. A binder containing a binder, 140 to 160 parts by weight of aggregate based on 100 parts by weight of the binder, 13 to 20 parts by weight of water based on 100 parts by weight of the binder, and 2.0 to 2.8 wt% of the total weight of the concrete. It may include a fluidizing agent and a setting retardant of 0.4 wt% to 1.0 wt% based on the total weight of concrete.

Additionally, in some embodiments, the nozzle device may further include a trowel plate disposed at an end of the first concrete nozzle.

At this time, the trowel plate may be configured to be rotatable.

Additionally, the trowel plate may have a spray hole for spraying water.

The vibration member may be disposed at a lower end of the screw shaft.

Discharging concrete using the first concrete nozzle may be configured to forcibly discharge the concrete using the screw and discharge the concrete by vibrating it using a vibrating member.

A construction method using a 3D printing nozzle device for construction according to an embodiment of the present invention to solve the above other problems includes dispensing rapid hardening concrete using a first concrete nozzle to form a first wall and a second wall that are spaced apart from each other. It includes forming an insulation material on the inner surface of the first wall, and pouring internal concrete between the insulation material and the second wall using a second concrete nozzle.

Between forming the first wall and the second wall and pouring the internal concrete, the method may further include inserting and arranging reinforcing bars between the first wall and the second wall.

Additionally, the pouring of the internal concrete may be performed before the second wall is completely hardened.

At this time, the internal concrete may fill surface voids of the rapidly hardening concrete forming the second wall.

The construction method may further include, after pouring the internal concrete, partially inserting the end of the first concrete nozzle into the internal concrete before hardening and compacting it using a vibrating member.

The curvature of the outer surfaces of the first wall and the second wall may be smaller than the curvature of the inner surfaces.

Specific details of other embodiments are included in the detailed description.

According to embodiments of the present invention, the time required for 3D printing can be reduced by including a first concrete nozzle for discharging rapid hardening concrete (rapid-setting concrete) and a second concrete nozzle for discharging concrete for internal pouring. This can not only improve economic efficiency but also contribute to improving the durability of the structure.

Specifically, after rapidly hardening concrete is discharged using a first concrete nozzle and an insulation material is installed on the inner surface thereof, internal concrete, which takes a relatively long time to harden and cure, can be poured using a second concrete nozzle. In addition, before pouring the internal concrete, reinforcing steel construction work can be performed inside it to increase the tensile strength of the wall and/or slab and satisfy the earthquake-resistant design.

Effects according to embodiments of the present invention are not limited to the contents exemplified above, and further various effects are included in the present specification.

Figure 1 is a perspective view of a 3D printing nozzle device for construction according to an embodiment of the present invention.
Figure 2 is an exploded perspective view of the nozzle device of Figure 1.
Figure 3 is a cross-sectional view of the nozzle device of Figure 1.
Figure 4 is a perspective view showing a state in which the second concrete nozzle of the nozzle device of Figure 1 is slid downward.
Figure 5 is a schematic diagram showing a 3D printing system for construction using the nozzle device of Figure 1.
Figure 6 is a perspective view of a 3D printing nozzle device for construction according to another embodiment of the present invention.
Figure 7 is a perspective view of a 3D printing nozzle device for construction according to another embodiment of the present invention.
8 to 13 are diagrams showing a construction method according to an embodiment of the present invention.

The advantages and features of the present invention and methods for achieving them will become clear by referring to the embodiments described in detail below along with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and will be implemented in various different forms, and only the embodiments serve to ensure that the disclosure of the present invention is complete, and those skilled in the art It is provided to fully inform the person of the scope of the invention, and the present invention is only defined by the scope of the claims. That is, various changes may be made to the embodiments presented by the present invention. The embodiments described below are not intended to limit the embodiments, but should be understood to include all changes, equivalents, and substitutes therefor.

Unless otherwise defined, all terms (including technical and scientific terms) used in this specification may be used with meanings that can be commonly understood by those skilled in the art to which the present invention pertains. Additionally, terms defined in commonly used dictionaries are not interpreted ideally or excessively unless clearly specifically defined.

Spatially relative terms such as 'above', 'upper', 'on', 'below', 'beneath', and 'lower' are used in the drawing. As shown, it can be used to easily describe the correlation between one element or component and other elements or components. Spatially relative terms should be understood as terms that include different directions of the element when used in addition to the direction shown in the drawings. For example, when an element shown in a drawing is turned over, an element described as 'below or beneath' another element may be placed 'above' the other element. Accordingly, the illustrative term 'down' may include both downward and upward directions.

The size, thickness, width, length, etc. of components shown in the drawings may be exaggerated or reduced for convenience and clarity of explanation, so the present invention is not limited to the form shown.

As used herein, 'and/or' includes each and every combination of one or more of the mentioned items. Additionally, the singular form also includes the plural form unless specifically stated in the phrase. As used herein, 'comprises' and/or 'comprising' do not exclude the presence or addition of one or more other components in addition to the mentioned components. The numerical range expressed using 'to' indicates a numerical range that includes the values written before and after it as the lower limit and upper limit, respectively. ‘About’ or ‘approximately’ means a value or numerical range within 20% of the value or numerical range stated thereafter.

In this specification, when referring to components, ordinal modifiers such as 'first component', 'second component', '1-1 component', etc. are used to distinguish one component from another component. It just happens. Accordingly, the first component referred to below may be referred to as the second component within the scope of the technical idea of the present invention. For example, what is referred to as a first component in one embodiment may be referred to as a second component in another embodiment. Also, of course, what is referred to as a first component in the description of the invention may be referred to as a second component in the claims.

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

Figure 1 is a perspective view of a 3D printing nozzle device for construction according to an embodiment of the present invention. Figure 2 is an exploded perspective view of the nozzle device of Figure 1. Figure 3 is a cross-sectional view of the nozzle device of Figure 1. Figure 4 is a perspective view showing a state in which the second concrete nozzle of the nozzle device of Figure 1 is slid downward. Figure 5 is a schematic diagram showing a 3D printing system for construction using the nozzle device of Figure 1.

1 to 5, the 3D printing nozzle device 11 for construction according to this embodiment includes a first concrete nozzle 100 and a second concrete nozzle 200, and may further include a driving unit 500. You can. As shown in FIG. 5, the nozzle device 11 according to this embodiment can be coupled to the end of a robot arm, etc. and implemented as an architectural 3D printing device or an architectural 3D printing system.

The inner space of the first concrete nozzle 100 and the inner space of the second concrete nozzle 200 may be separated from each other and configured to discharge different types of concrete. For example, the first concrete nozzle 100 discharges a rapidly hardening concrete composition (or a PC type concrete composition), and the second concrete nozzle 200 discharges a concrete composition with a relatively slow hardening speed and high fluidity (or an RC type concrete composition). concrete composition) can be discharged.

The first concrete nozzle 100 may be longer than the second concrete nozzle 200. In addition, the first concrete nozzle 100 may include an upper nozzle unit 110 with a relatively large internal space (e.g., inner diameter) and a lower nozzle unit 120 with a relatively small internal space. there is. The upper nozzle unit 110 has a substantially hollow cylindrical shape, and the lower nozzle unit 120 may have a shape whose width becomes smaller toward the lower end. A first discharge port 100h for discharging concrete may be formed at the bottom of the lower nozzle unit 120.

The upper nozzle portion 110 of the first concrete nozzle 100 may have a concrete injection port 110a connected to a rapid hardening concrete hopper (not shown). The rapidly hardening concrete composition injected into the inner space of the first concrete nozzle 100 through the concrete injection port 110a is mixed using the screw 300 and can be discharged through the first discharge port 100h by the screw 300. .

A screw 300 and a vibration member 400 may be disposed in the internal space of the first concrete nozzle 100. The screw 300 may include a screw shaft 310 and a blade 330 disposed on the outer peripheral surface of the screw shaft 310. The rapid hardening concrete is continuously mixed using the screw 300, and hardening of the rapid hardening concrete within the first concrete nozzle 100 can be prevented. Additionally, the rapid hardening concrete composition may have a relatively higher viscosity compared to the internal concrete composition. Therefore, the rapidly hardening concrete can be pushed out using the blade 330 of the screw 300, and forced discharge and discontinuation of discharge through the first discharge port 100h can be performed.

The vibration member 400 may be disposed within the first concrete nozzle 100. Specifically, it may be placed on the lower end of the screw shaft 310. The method of implementing the vibration member 400 is not particularly limited, but for example, an eccentric rotating body may be used. The vibration member 400 may cause overall vibration or tremor of the first concrete nozzle 100 and the screw 300. As described above, it is necessary to prevent the rapidly hardening concrete composition from unintentionally hardening inside the first concrete nozzle 100. Therefore, in addition to mixing the rapid hardening concrete composition using the screw 300, hardening of the concrete composition is further prevented using the vibration member 400 attached to the screw shaft 310 and clogging of the first concrete nozzle 100 is prevented. It can be prevented.

In addition, compaction of the discharged concrete can be performed using the vibrating member 400. In other words, it can perform the function of spreading the concrete composition evenly so that the discharged concrete can be spread evenly without clumping. This will be described later.

The rapidly hardening concrete (or quick-setting concrete) discharged by the first concrete nozzle 100 may have a faster hardening speed, higher viscosity, and lower fluidity than the internal concrete discharged by the second concrete nozzle 200.

In an exemplary embodiment, the rapid hardening concrete includes aggregate, binder, and water, and may further include an admixture.

Aggregate may include sand, gravel, stones, slag, etc. Aggregates make up concrete together with binders and can increase strength. The aggregate may be included in an amount of about 140 to 160 parts by weight, or about 145 to 155 parts by weight, based on 100 parts by weight of the binder, which will be described later.

The binder may include or be comprised of cement, fly ash, and silica fume. For example, the binder may be about 65 wt% to 74 wt%, or about 68 wt% to 72 wt%, or about 70 wt% cement, about 18 wt% to 22 wt%, or about 19 wt% to 21 wt%, or about 20 wt% by weight. of fly ash and 7.0 wt% to 13 wt%, or about 8.0 wt% to 12 wt%, or about 9.0 wt% to 11 wt%, or about 10 wt% of silica fume.

Water may be included in an amount of about 13 to 20 parts by weight, or about 14 to 17 parts by weight, or about 15 parts by weight, based on 100 parts by weight of the binder.

Admixtures (or admixtures) may be used to impart rapid setting properties to the concrete composition. Admixtures may include fluidizing agents and setting retarders. Depending on the content ratio of the fluidizer and the setting retardant, a concrete composition that can be used in 3D printing construction can be provided. In an exemplary embodiment, the fluidizing agent may be included in an amount of about 2.0 wt% to 2.8 wt%, or about 2.2 wt% to 2.6 wt%, or about 2.4 wt%, based on the total weight of the rapid hardening concrete composition. Additionally, based on the total weight of the rapid hardening concrete composition, the setting retardant may be included in an amount of about 0.4 wt% to 1.0 wt%, or about 0.6 wt% to 0.8 wt%, or about 0.7 wt%.

The second concrete nozzle 200 may have a generally hollow cylindrical shape. A second discharge port 200h for discharging concrete may be formed at the bottom of the second concrete nozzle 200. Although not shown in the drawing, the upper end of the second concrete nozzle 200 may be connected to an internal concrete hopper (not shown).

The second outlet 200h may have a larger size, for example, an inner diameter, than the first outlet 100h. As a non-limiting example, the first discharge port (100h) and the second discharge port (200h) each have a circular shape in plan, and the inner diameter of the first discharge port (100h) is about 30 mm to 40 mm, or about 32 mm to 38 mm. The inner diameter of the second discharge port 200h may be about 45 mm to 55 mm, or about 47 mm to 53 mm. The concrete composition discharged through the first discharge port (100h) can be precisely discharged at a desired location using a 3D printing method and hardened simultaneously with discharge. Therefore, precise discharge can be achieved using a relatively small discharge port. On the other hand, as will be described later, the concrete composition discharged through the second discharge port 200h may be required to be smoothly discharged as internal concrete. Additionally, the internal concrete composition may have a higher aggregate content than the rapid hardening concrete composition. Therefore, smooth discharge can be achieved by using a relatively large discharge port.

In an exemplary embodiment, the first concrete nozzle 100 and the second concrete nozzle 200 may be configured to change their relative positions in the vertical direction. For example, a guide rail 250 extending in the vertical direction is provided on the side of the first concrete nozzle 100, and the second concrete nozzle 200 has a guide rail 250 based on the first concrete nozzle 100. ) can be slid along. Additionally, the vertical length of the second concrete nozzle 200 may be longer than the length of the lower nozzle portion 120 of the first concrete nozzle 100.

As described above, the nozzle device 11 including the first concrete nozzle 100 and the second concrete nozzle 200 can be combined with a robot arm, etc. to form a 3D printing system for construction. At this time, concrete discharge through the first concrete nozzle 100 and concrete discharge through the second concrete nozzle 200 may be performed sequentially or selectively according to the progress of the process, rather than being performed simultaneously. At this time, under normal conditions or while using the first concrete nozzle 100, the second concrete nozzle 200 moves upward to prevent interference. In addition, while using the second concrete nozzle 200, the second concrete nozzle 200 moves downward and the second discharge port (200h) protrudes downward compared to the first discharge port (100h) to prevent interference. You can. The moving speed of the second concrete nozzle 200 may be implemented at about 30 cm/s to 50 cm/s, or about 35 cm/s to 40 cm/s, but the present invention is not limited thereto.

For this purpose, a driving unit 500 may be provided. The driving unit 500 may include one or more motors, but the present invention is not limited thereto. The driving unit 500 may be configured to perform one or more of rotation of the screw 300, vibration of the vibration member 400, and/or vertical movement of the second concrete nozzle 200. For example, Figure 1 and the like illustrate a case where the screw 300 is configured to rotate using a bevel gear structure.

According to this embodiment, rapidly hardening concrete with high viscosity can be smoothly and stably supplied using the first concrete nozzle 100. Therefore, workability and work efficiency can be improved. In addition, when discharging a plurality of different types of concrete compositions, precise control of the pouring time may be possible, such as pouring the internal concrete composition before the rapid hardening concrete is completely hardened. Therefore, the durability of the structure built using the nozzle device 11 can be increased.

Hereinafter, other embodiments of the present invention will be described. However, the description of the same or extremely similar configuration as the above-described embodiment will be omitted, and this will be clearly understood by those skilled in the art from the attached drawings.

Figure 6 is a perspective view of a 3D printing nozzle device for construction according to another embodiment of the present invention.

Referring to FIG. 6, the 3D printing nozzle device 12 for construction according to this embodiment further includes a trowel plate 600 disposed at the end of the lower nozzle portion of the first concrete nozzle 100, as shown in FIG. 1. This is different from the nozzle device according to the example.

The trowel plate 600 (or plastering member) may be placed on a plane space to which the vertical direction belongs. As will be described later, when rapidly hardening concrete is laminated using a 3D printing method, the side may have a bumpy and concave-convex structure. Therefore, at the same time as the rapid hardening concrete is discharged using the first concrete nozzle 100, or immediately after, the side of the discharged rapid hardening concrete can be smoothly pressed using the trowel plate 600.

For this purpose, the trowel plate 600 is disposed at the lower end of the first concrete nozzle 100 adjacent to the first discharge port 100h, and moves in the vertical direction and on a plane in the outer circumferential direction of the first concrete nozzle 100. It may be configured to allow rotation. For example, when performing the operation of discharging rapid hardening concrete through the first concrete nozzle 100, the trowel plate 600 may be slidably moved downward and positioned to protrude lower than the first discharge port 100h. . Alternatively, when forming a wall using the nozzle device 12 according to a previously entered drawing, the trowel plate 600 may be configured to rotate and move according to the horizontal curved structure of the wall to form a smooth edge.

In some embodiments, a spray hole (not shown) that sprays water may be formed on the inner surface of the trowel plate 600, that is, the surface facing the first discharge hole 100h. When the surface of a wall formed by rapidly hardening concrete is pressed smoothly using the trowel plate 600, water is sprayed from the spray hole of the trowel plate 600 to perform plastering work, thereby increasing work efficiency.

Figure 7 is a perspective view of a 3D printing nozzle device for construction according to another embodiment of the present invention.

Referring to FIG. 7, the 3D printing nozzle device 13 for construction according to the present embodiment further includes a degree of hardness determination member 700 disposed at the lower end of the first concrete nozzle 100. This is different from the nozzle device that follows.

The degree of hardness determination member 700 may be protrudingly disposed on the side of the lower nozzle portion of the first concrete nozzle 100. For example, the degree of hardness determination member 700 may include a pin 710 and an elastic member 730.

As described above, in order to construct a structure with excellent durability, the discharge timing of the rapid hardening concrete discharged using the first concrete nozzle 100 and the internal concrete discharged using the second concrete nozzle 200 can be an important factor. . For example, as will be described later, discharge of internal concrete may be required when rapidly hardening concrete has hardened to a certain degree but has not completely hardened. Therefore, the degree of hardening of the rapidly hardening concrete can be determined using the degree of hardening determination member 700 of the nozzle device 13. That is, the nozzle device 13 moves in the horizontal direction based on the inputted drawing information to discharge rapid hardening concrete at a desired location, and at the same time moves in the horizontal direction to determine the degree of hardening of the rapid hardening concrete. .

Specifically, rapid hardening concrete can be pressed using the pin 710. At this time, the reaction force applied to the pin 710 may vary depending on the degree of hardening of the rapidly hardening concrete. At this time, the reaction force can be measured or estimated by supporting the pin 710 using an elastic member 730 such as a spring. For example, when the hardening degree of rapidly hardening concrete is large, the pin 710 may be inserted inside by pressing the elastic member 730 rather than being inserted into the concrete wall. For another example, when the hardening degree of the rapidly hardening concrete is small, the pin 710 may be at least partially inserted into the concrete wall and the degree to which the elastic member 730 is pressed may be small.

Hereinafter, a 3D printing construction method or construction method according to the present invention will be described.

8 to 13 are diagrams showing a construction method according to an embodiment of the present invention.

First, referring to FIG. 8, a first wall 810 and a second wall 820 are formed on the ground. One of the first wall 810 and the second wall 820 may correspond to the outer wall of the structure (building), and the other may correspond to the inner wall of the structure.

The first wall 810 and the second wall 820 may be formed by stacking them using a 3D printing method. That is, it can be formed by discharging rapidly hardening concrete through the first concrete nozzle 100 of the nozzle device 11. At this time, the first concrete nozzle 100 of the nozzle device 11 can reciprocate in the horizontal direction several times and stack rapidly hardening concrete in the vertical direction. Accordingly, the side surfaces of the first wall 810 and/or the second wall 820 may have an uneven uneven structure. As described above, the surfaces of the first wall 810 and the second wall 820 can be processed smoothly using a trowel plate.

Next, with further reference to FIG. 9, an insulating material 830 is disposed between the first wall 810 and the second wall 820, which are spaced apart from each other in the horizontal direction. For example, the insulation material 830 is disposed on the inner surface of the first wall 810 so as to contact the inner surface of the first wall 810. As the type of insulating material 830 may be known, detailed description will be omitted.

Next, with further reference to FIG. 10, reinforcing bars 840 are placed between the first wall 810 and the second wall 820, specifically between the insulation material 530 and the second wall 820. For example, reinforcing bars 840 extending in the vertical direction can be inserted into the ground.

Next, with further reference to FIG. 11, internal concrete 850 is poured between the first wall 810 and the second wall 820. That is, the internal concrete 850, which has relatively high fluidity and increases strength after curing, is poured using the second concrete nozzle 200 of the nozzle device 11 to form the first wall 810 and the second wall 820. The gap can be filled. As described above, in the process of discharging the internal concrete 850, the second concrete nozzle 200 moves relatively downward compared to the first concrete nozzle 100, thereby minimizing interference.

As described above, when the reinforcing bars 840 are constructed before the pouring of the internal concrete 850, the internal concrete 850 may be filled to surround the reinforcing bars 840. Therefore, the durability of the structure can be increased.

In addition, in some embodiments, the pouring of the internal concrete 850 may be performed before the rapidly hardening concrete constituting the first wall 810 and the second wall 820 is completely hardened. In this case, the internal concrete 850 can fill the uneven inner surfaces of the first wall 810 and the second wall 820 and the fine pores on their surfaces. Therefore, the interfacial adhesion between the first wall 810 and the second wall 820 formed of rapidly hardening concrete and the internal concrete filled between them can be increased.

Next, with further reference to FIG. 12, the end of the nozzle device 11, for example, the lower end of the first concrete nozzle 100, is at least partially inserted into the poured inner concrete 850, and the inner concrete (850) is inserted using a vibrating member. 850) resolutions can be carried out. The internal concrete discharged from the second concrete nozzle may not be completely flat or evenly filled and may be partially agglomerated. At this time, rather than performing the compaction work directly or waiting for the internal concrete to naturally spread, the compaction process can be performed using the vibrating member of the nozzle device 11 to shorten the construction period and increase work stability.

Next, with further reference to FIG. 13, the first wall 810 and the second wall 820 are further stacked in the vertical direction. As described above, the first wall 810 and the second wall 820 can be formed by discharging rapidly hardening concrete through the first concrete nozzle 100 of the nozzle device 11.

The construction method according to the present invention can repeat the above process and form the walls of the structure by 3D printing.

Although not shown in the drawing, when the outer surface of the first wall 810 or the second wall 820 is processed smoothly using the trowel plate installed at the lower end of the nozzle device, the inner and outer surfaces of the first wall 810 and the second wall 820 are processed smoothly. 2 The degree of unevenness of the inner and outer surfaces of the wall 820 may vary. For example, the curvature of the inner surface of the first wall 810 facing the second wall 820 may be greater than the curvature of the outer surface of the first wall 810. Likewise, the curvature of the inner surface of the second wall 820 facing the first wall 810 may be greater than the curvature of the outer surface of the second wall 820. Since the first wall 810 and the second wall 820 form the exterior of the structure, they are processed smoothly using a trowel plate (not shown), and the inner surfaces of the first wall 810 and the second wall 820 are processed smoothly. By using irregularities, the interfacial adhesion and durability with the internal concrete (850) can be improved.

According to the present invention, the design and construction of a wall can be achieved easily and conveniently, such as designing and ordering a desired building online. Therefore, it is possible to discover new demands in the construction industry and achieve atypical design architecture that expresses the individuality of the client.

In addition, the pouring and curing process of concrete using existing formwork takes a long time and relies on manpower, which has uneconomical limitations. Additionally, the problem of safety accidents always follows. However, according to the present invention, the installation and removal of the form can be omitted. At the same time, even though it is a 3D printing method, it is possible to achieve a reinforced concrete structure.

Although the description has been made above with a focus on embodiments of the present invention, this is merely an example and does not limit the present invention, and those skilled in the art will be able to understand the present invention without departing from the essential characteristics of the embodiments of the present invention. It will be apparent that various modifications and applications not exemplified above are possible.

Therefore, the scope of the present invention should be understood to include changes, equivalents, or substitutes of the technical ideas exemplified above. For example, each component specifically shown in the embodiments of the present invention can be modified and implemented. And these variations and differences in application should be construed as being included in the scope of the present invention as defined in the appended claims.

11: 3D printing nozzle device for construction
100: first concrete nozzle
200: Second concrete nozzle
300: screw
400: Vibration member
500: driving part

Claims (11)

A first concrete nozzle and a second concrete nozzle separated from each other;
a screw disposed within the first concrete nozzle; and
A 3D printing nozzle device for construction including a vibration member disposed within the first concrete nozzle. According to paragraph 1,
The first concrete nozzle and the second concrete nozzle are configured to slide each other in an upward and downward direction,
The size of the discharge port of the first concrete nozzle is smaller than the size of the discharge port of the second concrete nozzle,
The first concrete nozzle is a nozzle for discharging rapid hardening concrete,
The second concrete nozzle is a 3D printing nozzle device for construction that is a nozzle for discharging concrete with a lower viscosity than the rapidly hardening concrete. According to paragraph 2,
The rapid hardening concrete,
A binder containing cement, fly ash, and silica fume, based on the weight of the binder, comprising 65 wt% to 74 wt% of cement, 18 wt% to 22 wt% of fly ash, and 7.0 wt% to 13 wt% of silica fume,
140 to 160 parts by weight of aggregate based on 100 parts by weight of the binder,
13 to 20 parts by weight of water based on 100 parts by weight of the binder,
2.0 wt% to 2.8 wt% of a fluidizing agent based on the total weight of concrete, and
A 3D printing nozzle device for construction, comprising 0.4 wt% to 1.0 wt% of a setting retardant based on the total weight of concrete. According to paragraph 1,
A 3D printing nozzle device for construction further comprising a trowel plate disposed at an end of the first concrete nozzle. According to clause 4,
The trowel plate is configured to be rotatable,
The trowel plate is a 3D printing nozzle device for construction having a spray hole for spraying water. According to paragraph 1,
The vibration member is disposed at the lower end of the screw shaft,
Discharging concrete using the first concrete nozzle is a 3D printing nozzle device for construction configured to forcibly discharge the concrete using the screw and discharge the concrete by vibrating it using a vibrating member. A construction method using the architectural 3D printing nozzle device according to claim 1,
Rapidly hardening concrete is deposited and discharged using a first concrete nozzle to form a first wall and a second wall spaced apart from each other,
Disposing an insulation material on the inner surface of the first wall,
A construction method comprising pouring internal concrete between the insulation material and the second wall using a second concrete nozzle. In clause 7,
A construction method further comprising inserting and arranging reinforcing bars between the first wall and the second wall between forming the first wall and the second wall and pouring internal concrete. In clause 7,
The pouring of the internal concrete is performed before the second wall is completely cured,
A construction method in which the internal concrete fills surface voids of rapidly hardening concrete forming the second wall. According to clause 9,
After pouring the internal concrete, the construction method further includes the step of partially inserting the end of the first concrete nozzle into the internal concrete before hardening and compacting it using a vibrating member. In clause 7,
A construction method wherein the curvature of the outer surfaces of the first wall and the second wall is smaller than the curvature of the inner surfaces.