CN115961704A - High-heat-insulation honeycomb element precast concrete panel for preventing heat bridge and horizontal connection technology - Google Patents

Abstract

The invention discloses a connection method using heat insulation members and a connection between a building and a precast concrete panel, which can resist earthquake and wind load, for improving the heat insulation performance of the building. Provided is a connection method for controlling a thermal bridge phenomenon occurring at a connection position of a beam or slab using a precast concrete panel installed by an external insulation method. Inserting insulation into each panel, a groove being formed inwardly in an upper portion of the first layer of panels and a lower portion of the second layer of panels such that the insulation rests therein, installing an L-shaped piece of metal to connect the first layer of panels and the second layer of panels, the L-shaped piece of metal comprising a vertical section and a horizontal section, the vertical section being provided with a sleeve-shaped bore into which a protruding anchor rod embedded in the panel is inserted, and the horizontal section being provided with a bore coupled to an upper portion of the beam or slab by a bolted connection. The heat insulating member is laid in a state where the L-shaped metal member is mounted.

Description

High-heat-insulation honeycomb element precast concrete panel for preventing heat bridge and horizontal connection technology

Citations to related applications

The priority rights of the present application, entitled "horizontal joining technique for prefabricated concrete panels capable of preventing thermal bridges" filed on 10/8/2021, korean patent application No. 10-2021-0134287 entitled "horizontal joining technique for prefabricated concrete panels capable of preventing thermal bridges", filed on 10/28/2021, patent application No. 10-2021-0146001 entitled "horizontal joining technique for prefabricated concrete panels capable of preventing thermal bridges", filed on 10/8/2021, patent application No. 10-2021-0134305 entitled "honeycomb cellular-based high-insulation prefabricated concrete panels with superior earthquake and wind load resistance", filed on 10/8/2021, and filed on 28/2021, entitled "honeycomb-based high-insulation prefabricated concrete panels with superior earthquake and wind load resistance", filed on 10/8/2021, are incorporated herein by reference in their entireties.

Background

The present disclosure relates to a precast concrete panel, and more particularly, to a horizontal connection technique for a precast concrete panel.

The disclosure is derived from the research of the national earth traffic minister land road traffic technical service support research fund.

[ project identification number 1615011751, research title: development of technology for high-insulation, non-combustible and eco-friendly precast concrete panels for commercialized honeycomb cellular foundation structure ]

In an exterior structure of a building, an exterior wall surface of a concrete building is composed of a composite structure constructed by forming an insulation layer on an exterior surface of a wall and finishing the exterior surface with various exterior materials in order to achieve insulation performance and an aesthetic appearance of the building.

In such a composite structure, polyurethane or expanded polystyrene as a thermal insulation material is installed on an external wall surface when a concrete wall is formed. The exterior surface is then finished with tile, stone, or metal (such as aluminum plate), which is the finishing material for the final finishing process.

Generally, an external insulation system in which insulation is installed outside is advantageous in terms of insulation performance based on a structure (concrete), because cold external air is difficult to flow inside compared to an internal insulation system in which insulation is installed inside.

However, the external insulation system according to the related art has a limitation in improving insulation performance by the structure itself. Furthermore, there is no measure to prevent the thermal bridge phenomenon, which occurs in the vertical and horizontal connection portions or joints of the external thermal insulation (i.e., the areas where the external thermal insulation is stacked, the lower portions of the beams or slabs, and the horizontal connection locations of the external thermal insulation). Furthermore, no measures are prepared against earthquakes and wind loads.

[ Prior art documents ]

Korean patent publication No. 2018-0130973 (published in 2018, 12 months and 10 days)

Korean patent publication No. 2019-0060510 (published in 6/3/2019)

Disclosure of Invention

The present disclosure provides a connection method using insulation for improving insulation performance of a building, which is deteriorated due to a thermal bridge phenomenon in horizontal and vertical connection positions where Precast Concrete (PC) panels installed by an external insulation method are connected to each other; and a detailed connection between the building and the precast concrete panel capable of resisting earthquake and wind load.

The present disclosure also provides a method for applying a fusion technique of inorganic-based concrete and honeycomb element-based insulation having low thermal conductivity, which is a limitation of inorganic-based materials in order to achieve high thermal conductivity; and for designing a section of a cellular element-based Precast Concrete (PC) panel by using a reinforcing material capable of securing safety even under earthquake and wind load.

According to an exemplary embodiment of the present disclosure, there is provided a connection method for controlling a thermal bridge phenomenon occurring at a connection location using a beam or slab of a precast concrete panel installed by an external insulation method, in which an insulation member is inserted into each panel, a groove is inwardly formed in an upper portion of a first-layer panel and a lower portion of a second-layer panel such that the insulation member is seated therein, an L-shaped metal member including a vertical section and a horizontal section is installed to connect the first-layer panel and the second-layer panel, the vertical section is provided with a bushing-shaped hole, a protruding anchor rod embedded in the panel is inserted into the bushing-shaped hole, and the horizontal section is provided with a hole coupled to the upper portion of the beam or slab by a bolt connection, wherein the insulation member is seated in a state where the L-shaped metal member is installed.

Further, the heat insulating member may be formed such that an outer portion thereof except for a portion corresponding to the protruding anchor rod is made of a plated steel plate, and one surface of the plated steel plate is extended to form a protruding section connected to the horizontal section of the L-shaped metal member.

In addition, honeycomb cell structures (honeycomb metal structures) may be embedded in the insulation.

Furthermore, the gap in the connection position between the upper portion of the first layer of panels and the lower portion of the second layer of panels may be filled by a caulking or grouting method.

Furthermore, thermal bridges in the vertical connection structure between the precast concrete panels may be prevented because a T-bar honeycomb cell structure is installed between the precast concrete panels, the T-bar honeycomb cell structure including a first side section, a second side section, and a front section, wherein a portion of the first side section and the front section is inserted into a first groove formed at one side end of the first panel and having a corresponding shape, and another portion of the second side section and the front section is inserted into a second groove formed at one side end of the second panel and having a corresponding shape.

Furthermore, the gap in the connection position between the first panel and the second panel may be filled by a caulking or grouting method.

Furthermore, by using deformed steel bars or wire mesh, relative to a horizontal section, the compression reinforcement and the tensile reinforcement are distributed in the front section and the rear section of the panel, respectively, wherein the shear reinforcement is distributed to connect the compression reinforcement and the tensile reinforcement and is distributed in a diagonal shape along the sides of the panel to form a closed structure, and the insulation is provided inside the closed structure, the honeycomb cell structure being embedded in the insulation.

Further, the honeycomb unit having a certain width may be repeatedly formed in the upper and lower portions of the honeycomb cell structure, and the waterproof sheet material may be attached to the side surfaces, the upper surface, and the lower surface of the honeycomb cell structure.

According to another exemplary embodiment of the present invention, there is provided a precast concrete panel structure including insulation concrete, wherein, with respect to a horizontal section, a diagonal uneven section is formed in a side surface of a panel, a T-shaped honeycomb structure is inserted and coupled to the diagonal uneven section, the T-shaped honeycomb structure is inserted into an outside of the side surface of a first row of the panel, and then a second row of the panel is installed, and a gap, which is in a connection position between the first row of the panel and the second row of the panel, is filled by a caulking or grouting method, wherein, by using deformed steel bars or wire nets, a compression reinforcing material and a tensile reinforcing material are distributed in front and rear sections of the panel, respectively, wherein a shear reinforcing material is distributed to connect the compression reinforcing material and the tensile reinforcing material, and is distributed in a diagonal shape along the side surface formed with the diagonal uneven section to form a closed structure, and an insulation member is provided inside the closed structure, the honeycomb structure being embedded in the insulation member.

Further, the honeycomb unit having a certain width may be repeatedly formed in the upper and lower portions of the honeycomb cell structure, and the waterproof sheet material may be attached to the side surfaces, the upper surface, and the lower surface of the honeycomb cell structure.

Further, the insulation concrete includes one or more selected from the group consisting of air bubbles, lightweight aggregate, and styrofoam beads.

Drawings

The exemplary embodiments can be understood in more detail by the following description taken in conjunction with the accompanying drawings, in which:

fig. 1A and 1B are views showing a connection detail of an external thermal insulation and a foundation portion in a first aspect of the present disclosure;

fig. 2 is a view showing the structure of a protruding anchor rod in the first aspect of the present disclosure;

fig. 3 is a view showing a detail of connection between a precast concrete panel and a beam or slab in the first aspect of the present disclosure;

fig. 4 is a view showing a connection detail of the second and third layers of the precast concrete panel according to the first aspect of the present disclosure;

fig. 5 is a view showing a connection detail of an insulation for controlling a thermal bridge in a connection area between precast concrete panels according to a first aspect of the present disclosure;

fig. 6 is a view showing modeling of a precast concrete panel structure and a heat flow analysis result of the modeling according to a first aspect of the present disclosure;

fig. 7A and 7B are views illustrating vertical connection of a T-shaped thermal insulation and a precast concrete panel in a first aspect of the present disclosure to control a thermal bridge and a construction state of grouting or coating after the vertical connection, respectively;

fig. 8 is a graph showing the results of heat flow analysis of modeling and modeling of a precast concrete panel structure according to a first aspect of the present disclosure;

fig. 9 is a view showing a structure of the insulating member with the honeycomb cell structure inserted therein in the first aspect of the present disclosure;

FIG. 10 is a view showing fusion between an insulation material and inorganic-based insulation concrete in a second aspect of the present disclosure to ensure a non-flammability rating;

fig. 11 shows a cross-sectional design of a precast concrete panel in a second aspect of the disclosure;

FIG. 12 illustrates exemplary shear and flexural shear performance in panels that fail to ensure safety against seismic and wind loads; and

fig. 13 is a view showing a shear-reinforcing material of a precast concrete panel in the second aspect of the invention.

Detailed Description

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. In the following description, if a detailed description related to a well-known technology is determined to obscure the subject matter of the present disclosure, the detailed description may be omitted. In the drawings, portions irrelevant to the description will be omitted to clearly describe the present disclosure, and like elements will be denoted by like reference numerals throughout the specification. Further, the direction of detailed configuration of the present disclosure will be described with reference to the drawings. In addition, when an element is described as "comprising" some elements, it is to be understood that it can also comprise other elements, unless explicitly described to the contrary.

First aspect of the invention

As a first aspect, the present disclosure provides a connection method for controlling a thermal bridge phenomenon occurring at a connection position of a beam or slab 140 using a precast concrete panel 100 installed by an external insulation method. Inserting a thermal insulation member 170 into each panel 100, a groove 160 being formed inwardly in an upper portion of the first layer of panels 100 and a lower portion of the second layer of panels 100 such that the thermal insulation member 170 rests therein, installing an L-shaped metal member 130 to connect the first layer of panels 100 and the second layer of panels 100, the L-shaped metal member including a vertical section 131 and a horizontal section 132, the vertical section 131 being provided with a sleeve-shaped bore 133 into which a protruding anchor rod 120 embedded in the panel 100 is inserted, and the horizontal section 132 being provided with a bore 134 coupled to an upper portion of the beam or slab 140 by a bolted connection 135. In a state where the L-shaped metal member 130 is mounted, the heat insulating member 170 is laid.

First, connection details for controlling a thermal bridge phenomenon occurring at a connection position of a beam or a slab according to the present disclosure will be described.

Fig. 1A and 1B are views showing a connection detail of an external thermal insulation and a foundation portion in the first aspect of the present disclosure.

Referring to fig. 1A, the precast concrete panel 100 installed by the external insulation method may be connected to a foundation 110 by using a coupling sleeve (splice sleeve) 111 pre-installed inside or a connection material 112 installed outside. The joint bushing 111, which is previously installed inside, is coupled to the reinforcing steel bar or the wire mesh 113, which is previously inserted into the foundation 110, and then, the precast concrete panel 100 may be fixed to the foundation 110 by grouting inside the joint bushing 111.

Further, referring to fig. 1B, in case of using a connection material 112 installed outside the precast concrete panel 100, the precast concrete panel 100 may be coupled to the connection material 112 by a bolt connection 115 or a welding portion 116, the connection material 112 existing in a steel plate 114 previously installed above the foundation 110.

The precast concrete panel 100 is completely fixed to the second layer of the foundation 110, and the precast concrete panel 100 is connected with the beam or slab 140 by using the protruding anchor rods 120, the L-shaped metal members 130, and the nuts 121 embedded in the precast concrete panel 100 (see fig. 2).

The protruding anchor rod 120 may have a diameter Φ 1 of about 6mm to 24 mm. One end of the protruding anchor rod 120 may protrude to the inside of the precast concrete panel 100, and the other end thereof may protrude to the outside of the precast concrete panel 100. As shown in fig. 2, the protruding anchor rod 120 protruding to the outside may have a thread 122 connected with a nut 121.

The details of the L-shaped metal member 130 are determined by the shearing force and moment introduced to the precast concrete panel 100, and the width W1 and the thickness T1 of the L-shaped metal member 130 may be in the range of about 30mm to about 500mm and in the range of about 5mm to about 30mm, respectively.

Fig. 3 is a view showing a detail of the connection between the precast concrete panel and the beam or slab in the first aspect of the present invention.

Referring to fig. 3, in the vertical section 131 and the horizontal section 132 of the L-shaped metal piece 130, a hole 133 of about 1mm to about 2mm larger than the diameter Φ 1 of the protruding anchor rod 120 is provided. The holes 133 formed in the vertical section 131 are provided in the form of sleeves, and the holes 134 formed in the horizontal section 132 are connected to the upper portion of a beam or slab 140 of reinforced concrete by bolt connections 135. Here, the protruding anchor rods 120 are connected through holes 133 formed in the vertical section 131 of the L-shaped metal piece 130 by using nuts 121. Furthermore, the hole 133 of the vertical section 131 is formed in a sleeve shape so that the connection between the protruding anchor rod 120 and the beam or slab 140 can be achieved regardless of a stepped portion between the beam and the precast concrete panel 100 due to a reinforced concrete construction error.

Fig. 4 is a view showing a connection detail of the second and third layers of the precast concrete panel according to the first aspect of the present disclosure.

Referring to fig. 4, the third layer of precast concrete panels 100 is connected to the reinforcing material 150 protruding above the second layer of precast concrete panels 100 by using the coupling sleeve 111 pre-installed at the inside. The connection method may be variously applied according to the structural type of the building. That is, in the case (a) where the building is an iron frame building, the horizontal section 132 of the L-shaped metal 130 is welded to the upper portion of the beam, and then, the protruding anchor rod 120 and the vertical section 131 are connected to each other. In case of constructing a building using the precast concrete panels 100 at the same time, a first layer of the precast concrete panels 100 is fixed to the foundation 110, and then, a half precast concrete beam or slab 140 is connected to the precast concrete panels 100.

Here, the L-shaped metal member 130 for connection is also determined by the shearing force and moment introduced to the precast concrete panel 100, and the width W1 and the thickness T1 may be in the range of about 30mm to about 500mm and in the range of about 5mm to about 30mm, respectively.

A kidney bracket may be formed in the lower end of the horizontal section 132 of the L-shaped metal member 130 to bear the self weight and building load of the half precast concrete beam or slab 140. After placing half of the precast concrete on the horizontal section 132 of the L-shaped metal piece 130, the steel bars exposed through the beam or slab 140 may be welded and connected to the horizontal section 132 of the L-shaped metal piece 130.

As described above, the present disclosure can achieve a design enabling resistance to earthquake and wind load through the complete connection between the beam or slab 140 of the building, the reinforcing material 150 of the precast concrete panel 100, and the L-shaped metal member 130.

Meanwhile, after the second and third layers of the precast concrete panels 100 are installed, the precast concrete panels 100 may be completely fixed by grouting inside the sleeves of the coupling sleeves 111.

The grooves 160 are formed inwardly in the upper portion of each second layer panel 100 and the lower portion of each third layer panel 100, and thus, the thermal insulation 170 rests on the boundary surface between the floors. The thermal insulating member 170 may have a rectangular parallelepiped shape in which the width W2 and the depth D2 are about 400mm to about 1200mm and about 20mm to about 150mm, respectively.

Fig. 5 is a view showing a connection detail of an insulation member for controlling a thermal bridge in a connection region between precast concrete panels according to a first aspect of the present disclosure.

Referring to fig. 5, a galvanized steel sheet 180 having a thickness of about 1mm to 3mm may be formed on the outside of the heat insulating member 170, and a protruding section 181 may extend from one surface thereof. The protruding section 181 may be welded and secured to an upper portion of the horizontal section 132 of the L-shaped metal piece 130. Here, the plated steel plate may not be formed on a portion corresponding to the protruding anchor bar 120 in order to establish coupling to the L-shaped metal piece 130.

Fig. 6 is a view illustrating a modeling of a precast concrete panel structure and a heat flow analysis result thereof according to a first aspect of the present disclosure.

Referring to fig. 6, by blocking heat flow using the thermal insulator 170 in the interlayer connection position between the precast concrete panels 100 according to the first aspect of the present disclosure, a thermal bridge phenomenon, which may occur at the ceiling portion on the lower floor and the bottom portion on the upper floor, may be effectively prevented. Meanwhile, it can be confirmed that a design for improving the resistance to earthquake and wind load can be achieved by the complete connection at the connection position between the beam or slab 140 of the building and the reinforcing material of the precast concrete panel 100.

Fig. 7A and 7B are views illustrating a horizontal connection of a T-shaped insulation and a precast concrete panel in the first aspect of the present disclosure to control a thermal bridge and a construction state of grout or a coating layer after the horizontal connection, respectively.

Referring to fig. 7A and 7B, the present disclosure provides a connection method for controlling a thermal bridge phenomenon occurring at a connection position of a beam or slab 140 using a precast concrete panel 100 installed by the above-described external insulation method and connection details for controlling a thermal bridge phenomenon occurring in vertical connection of the precast concrete panel 100.

The T-shaped thermal insulation 190 is used in the vertical connection between the precast concrete panels 100. That is, a honeycomb cell structure of T-bars, which includes a first side section 191, a second side section 192, and a front section 193, is inserted into the thermal insulation 190 by installing the thermal insulation 190 between the precast concrete panels 100 to block a thermal bridge in a vertical connection structure between the precast concrete panels 100. A part of the first side section 191 and the front section 193 is inserted into a first groove 101, the first groove 101 being formed at one side end of the first panel 100 and having a corresponding shape, and another part of the second side section 192 and the front section 193 is inserted into a second groove 201, the second groove 201 being formed at one side end of the second panel 200 and having a corresponding shape.

As described above, the precast concrete panel 100 according to the present disclosure has a shape in cross section, enabling the insertion of the T-shaped heat insulating member 190 into the panel. The first row of the precast concrete panels 100 is installed and then the T-shaped heat insulating member 190 is inserted into the side surface of the first row of the precast concrete panels 100. Subsequently, the second row of precast concrete panels 200 is installed. Then, a gap in a connecting position between the first row and the second row is filled by caulking or grouting.

Fig. 8 is a view illustrating a modeling of a precast concrete panel structure and a heat flow analysis result thereof according to a first aspect of the present disclosure.

Referring to fig. 8, it can be confirmed that a heat bridge phenomenon at a connection position may be effectively prevented by blocking heat flow using a T-shaped heat insulating member 190 in a vertical connection position between precast concrete panels 100 according to the present disclosure.

Meanwhile, the present disclosure provides a structure using a reinforcing material, which further ensures safety against earthquake and wind load in a vertical connection structure of precast concrete panels.

That is, referring to fig. 8, the present disclosure is configured such that, with respect to a horizontal section, a compressive reinforcing material 102 and a tensile reinforcing material 103 are distributed in the front section and the rear section of the panel 100, respectively, by using deformed rebar or wire mesh. The shear reinforcement material 104 is distributed to connect the compressive reinforcement material 102 and the tensile reinforcement material 103, and is distributed in a diagonal shape along the side of the panel 100 to form a closed structure. The insulation 170 is disposed inside the enclosure and the honeycomb cell structure is embedded in the insulation 170. Accordingly, a vertical connection structure of the precast concrete panel 100 may be provided, which may improve the thermal insulation performance of the building and the resistance to earthquake and wind load, the deterioration of the building due to the thermal bridge phenomenon.

Fig. 9 is a view showing the structure of the insulating member with the honeycomb cell structure inserted therein in the first aspect of the present disclosure.

Referring to fig. 9, honeycomb units having a certain width W3 and a size L3 are repeatedly formed in upper and lower portions of a honeycomb structure 171, and a waterproof sheet material (not shown) is attached to side, upper, and lower surfaces of the honeycomb structure. Accordingly, the thermal insulating member 170 with the honeycomb cell structure 171 inserted therein provides a structure in which closed pores are formed inside while ensuring a non-flammable grade. When the plate material is a laminated or silicone gel material, the laminated or silicone gel material has a waterproof function that prevents the insulation material from becoming wet by water inside the unhardened concrete when the insulation concrete is poured. Thereby, damage to the closed cells in the honeycomb cell structure can be prevented, and the sheet material is in a non-combustible grade, and thereby damage to the honeycomb cell structure due to fire can be minimized.

Second aspect of the invention

As a second aspect, the present disclosure provides a structure of a precast concrete panel 100. Disclosed is a precast concrete panel 100 in which a diagonal uneven section is formed in a side surface of the panel with respect to a horizontal section, a T-shaped thermal insulation is inserted and coupled to the diagonal uneven section, the T-shaped thermal insulation is inserted into an outside of a side surface of a first row of panels, and then a second row of panels is installed, and a gap in a connection position between the first row of panels and the second row of panels is filled by a caulking or grouting method, wherein a compression reinforcing material 102 and a tension reinforcing material 103 are distributed in front and rear sections of the panel 100, respectively, by using deformed steel bars or wire nets. The shear reinforcing material 104 is distributed to connect the compression reinforcing material 102 and the tensile reinforcing material 103, and the shear reinforcing material is distributed in a diagonal shape along the side surface formed with the diagonal uneven section 201 to form a closed structure. The insulation 170 is disposed within the enclosure and the honeycomb cell structure 171 is embedded in the insulation 170.

First, in the present disclosure, a thermal insulation member in which a honeycomb structure is embedded will be described with reference to fig. 9.

The heat insulating member 170 has a structure in which a closed hole is formed inside while ensuring a non-flammable grade. Here, the size of the insulation 170 may be set according to the overall size of the precast concrete panel 100. The width W4 and the depth D4 may be set in the range of about 200mm to about 1200mm and about 20mm to about 140mm, respectively, and the length L4 may be set in the range of about 200mm to about 2400mm, with respect to a horizontal section in the drawing.

The honeycomb cell structure 171 is embedded inside the insulation 170. The honeycomb cell structure 171 has a structure in which honeycomb units having a certain width W3 (thickness) are repeatedly formed at upper and lower portions thereof. Each cell may have a width W3 of about 3mm to about 10mm and a dimension L3 of about 30mm to about 150mm. The cells constituting the honeycomb cell structure prevent deformation due to the casting pressure of the insulating concrete and maintain a space for forming closed pores inside.

In addition, a plate material (not shown) having a thickness of about 0.6mm to about 0.8mm may be attached to the side surfaces, the upper surface, and the lower surface of the honeycomb cell structure 171. The sheet material preferably comprises a laminate or silicone gel material. This material has a waterproofing function that prevents the insulating material from being wetted by water inside the unhardened concrete when the insulating concrete is poured, and thus, damage to the closed pores in the honeycomb cell structure 171 can be prevented. The sheet material is in a non-combustible grade and, thus, damage to the honeycomb cell structure 171 due to fire can be minimized.

Next, the fusion between the insulation material and the inorganic-based insulation concrete to ensure the incombustibility grade in the present disclosure will be described with reference to fig. 10.

In the present disclosure, insulating concrete is based on materials such as air bubbles, lightweight aggregate, foam beads, etc. that are capable of forming voids inside the concrete. The compressive strength of the insulation concrete may be variously applied according to the use of the precast concrete panel 100. The compressive strength may be about 10Mpa to about 15Mpa for typical finishing materials, and about 24Mpa to about 36Mpa for structural materials. Further, the thermal conductivity of the thermal insulation concrete may be 0.15W/m.K or less.

In the present disclosure, the insulation material embedded with the honeycomb cell structure 171 may be fused to have a constant coating thickness by the inorganic-based insulation concrete. The coating thickness may be variously applied according to the thermal conductivity of the inorganic-based insulation concrete, and preferably may be about 30mm to about 70mm. Accordingly, the insulation material having the honeycomb cell structure 171 can secure an incombustibility grade with respect to fire, and in particular, the thermal conductivity can be significantly reduced by the fusion of the closed voids of the insulation material and the insulation concrete having a large number of voids therein.

Next, the design of a section of a precast concrete panel capable of securing safety against earthquake and wind load in the present disclosure will be described with reference to fig. 11, 12, and 13.

In the present disclosure, the precast concrete panel 100 adopts a structure capable of securing low tensile strength and crack resistance due to the use of the insulation concrete.

That is, in the present disclosure, the compressive reinforcement material 102 and the tensile reinforcement material 103 are distributed in the front section and the rear section of the panel 100, respectively, by using deformed rebar or wire mesh. The shear reinforcing material 104 is distributed to connect the compressive reinforcing material 102 and the tensile reinforcing material 103, and is distributed in a diagonal shape along the side surface formed with the diagonal uneven section 201 to form a closed structure.

Each of the compressive reinforcement 102, tensile reinforcement 103, and shear reinforcement 104 may be about 5.8mm to about 13mm in diameter. The reinforcement material comprises deformed rebar or wire mesh, and the reinforcement ratio of the compressive reinforcement material 102 is preferably about 40% to about 60% of the amount of tensile reinforcement material. Further, the reinforcement ratio of the tensile reinforcement 103 is preferably from about 0.0016 to about 0.0067, and the reinforcement ratio of the shear reinforcement 104 is preferably from about 0.00053 to about 0.00262. In addition, the reinforcing material must resist the moments and shear forces applied by earthquakes and wind loads. In particular, the reinforcement ratio of the tensile reinforcement material 103 to the shear reinforcement material 104 preferably satisfies the following equation (1) in order to induce complete bending in the precast concrete panel 100.

2V _n ＞V _fl (1)

In equation (1), V _n Represents the shear volume, and V _fl Representing the shear load converted from the nominal torque determined by the KBC 2019 design criteria. When equation (1) is not satisfied, it may be difficult to sufficiently ensure the ductility of the precast concrete panel 100 against wind load and seismic load because flexural shear or shear is dominant (see fig. 13).

Meanwhile, the shear reinforcement 104 forms a diagonal closed structure when being distributed, and the compression reinforcement 102 and the tensile reinforcement 103 installed in the front section and the rear section of the insulation 170 inserted inside may facilitate fixation when pouring the insulation concrete.

Next, details of the uneven shape connection of the precast concrete panels in consideration of the thermal bridge phenomenon in the present disclosure will be described with reference to fig. 7A, 7B, and 8.

In the present disclosure, a diagonal uneven section 201 is formed in a side surface of the panel 100 with respect to a horizontal section, and a T-shaped heat insulating member is inserted and coupled to the diagonal uneven section 201. The T-shaped heat insulating member 190 is inserted into the outside of the side surface of the first row of panels 100, and then the second row of panels 200 are installed.

That is, the diagonal uneven section 201 and the stepped uneven section form a space in which the insulation 170 can be inserted into a space between the connection areas of the precast concrete panels 100. Accordingly, the first row of the precast concrete panels 100 is installed, and then, the T-shaped insulation 190 is inserted and coupled to the side surface of the first row of the precast concrete panels 100. Subsequently, a second row of precast concrete panels 200 may be installed. Then, a gap in a connection position between the first row of panels 100 and the second row of panels 200 may be filled by a caulking or grouting method.

As described above, it was confirmed that, by blocking heat flow using the T-shaped heat insulating member 190 in the vertical connection position between the precast concrete panels 100, a heat bridge phenomenon, which may occur at the connection position, can be effectively prevented. Fig. 8 illustrates modeling of a precast concrete panel structure and heat transfer analysis results thereof according to the present disclosure.

According to the present disclosure, it is possible to prevent a thermal bridge phenomenon by installing an insulation member in vertical and horizontal connection regions of a precast concrete panel.

In addition, it is possible to maximize the thermal insulation performance of the precast concrete panel and reduce the energy consumption of the building by controlling the thermal bridge phenomenon.

Further, the on-site construction capability can be improved with a simple construction method.

Furthermore, the ability to withstand earthquake and wind loads can be improved by the complete connection between the beams of the building and the reinforcement material of the precast concrete panels.

In addition, the precast concrete panel according to the present disclosure may maximize thermal insulation performance by fusing the closed hole of the insulation and the insulation concrete, ensure fire resistance performance at the time of material finishing by ensuring incombustibility grade, ensure structural safety of the precast concrete panel against earthquake and wind load, and prevent a thermal bridge phenomenon by installing the insulation at the horizontal coupling region of the precast concrete panel.

The preferred embodiments of the present disclosure have been described above in detail. The description of the present disclosure is provided for illustration only, and it will be understood by those skilled in the art to which the present disclosure pertains that the present disclosure may be easily modified in other specific forms without changing the technical idea or essential features.

Claims (11)

1. A connecting method for controlling a heat bridge phenomenon occurring at a connecting position of a beam or slab using precast concrete panels installed by an external insulation method,

wherein a thermal insulation member is inserted into each of the panels,

the grooves being formed inwardly in an upper portion of the first layer of panels and a lower portion of the second layer of panels, such that the insulation rests therein,

installing an L-shaped piece of metal to connect the first layer of panels and the second layer of panels, the L-shaped piece of metal comprising a vertical section and a horizontal section, the vertical section being provided with a sleeve-shaped hole into which a protruding anchor rod embedded in the panels is inserted, and the horizontal section being provided with a hole coupled to an upper portion of the beam or slab by a bolted connection,

wherein the heat insulating member is laid on the L-shaped metal member in a state where the L-shaped metal member is mounted.

2. The connecting method according to claim 1, wherein the heat insulating member is formed such that an outer portion thereof except for a portion corresponding to the protruding anchor rod is made of a plated steel plate, and one surface of the plated steel plate is extended to form a protruding section connected to the horizontal section of the L-shaped metal member.

3. The method of joining as defined in claim 1, wherein the honeycomb cell structure is embedded in an insulation.

4. A connecting method according to claim 1, wherein a gap is filled by a caulking or grouting method, the gap being in a connecting position between the upper portion of the first layer of panels and the lower portion of the second layer of panels.

5. The connecting method according to claim 1, wherein thermal bridges in the horizontal connecting structure between the precast concrete panels are prevented by a T-bar honeycomb cell structure installed between the precast concrete panels, the T-bar honeycomb cell structure comprising a first side section, a second side section, and a front section,

wherein a part of the front section and the first side section are inserted into a first groove formed at one side end of a first panel and having a corresponding shape, and another part of the front section and the second side section are inserted into a second groove formed at one side end of a second panel and having a corresponding shape.

6. The connecting method according to claim 5, wherein a gap is filled by a caulking or grouting method, the gap being in a connecting position between the first panel and the second panel.

7. A joining method as claimed in claim 5, wherein, with respect to a horizontal section, compressive reinforcement and tensile reinforcement are distributed in the front and rear sections of the panels respectively by using deformed bars or wires,

wherein shear reinforcing material is distributed to connect the compressive reinforcing material and the tensile reinforcing material, and the shear reinforcing material is distributed in a diagonal shape along the sides of the panel to form an enclosed structure, an

The heat preservation piece is arranged inside the closed structure, and the honeycomb element structure is embedded into the heat preservation piece.

8. The connecting method according to claim 3 or 5, wherein honeycomb units having a certain width are repeatedly formed in upper and lower portions of the honeycomb cell structure, and waterproof sheet materials are attached to side, upper, and lower surfaces of the honeycomb cell structure.

9. A precast concrete panel structure comprising insulation concrete, wherein, with respect to a horizontal section, a diagonal uneven section is formed in side surfaces of panels, a T-shaped insulation is inserted and coupled to the diagonal uneven section, the T-shaped insulation is inserted into an outside of a side surface of a first row of panels, and then a second row of panels is installed, and a gap, which is in a connection position between the first row of panels and the second row of panels, is filled by a caulking or grouting method,

wherein a compressive reinforcement and a tensile reinforcement are distributed in the front section and the rear section of the panel, respectively, by using deformed steel bars or wire meshes,

wherein a shear reinforcing material is distributed to connect the compression reinforcing material and the tensile reinforcing material and is distributed in a diagonal shape along a side surface forming the diagonal uneven section to form a closed structure, an

The heat preservation piece is arranged inside the closed structure, and the honeycomb element structure is embedded into the heat preservation piece.

10. The precast concrete panel structure of claim 9, wherein honeycomb units having a certain width are repeatedly formed in upper and lower portions of the honeycomb cell structure, and a waterproof sheet material is attached to side, upper and lower surfaces of the honeycomb cell structure.

11. The precast concrete panel structure of claim 9, wherein the thermal concrete includes one or more selected from the group consisting of: air bubbles, lightweight aggregate, and foam beads.

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