Joint structure of PC members using fireproof bracket

Abstract

The present invention relates to a PC member joining structure using a fireproof bracket, wherein a PC horizontal member is mounted and joined on top of a fireproof bracket, which is a high-performance concrete block screw-coupled with a fastening bolt to a coupler embedded inside a PC vertical member, thereby eliminating the need for welding and fireproofing processes and providing excellent manufacturability and constructability due to the simple shape of the joined PC members. The present invention is intended for installing a second PC member, such as a slab or beam, on a first PC member, such as a wall or column. A coupler is embedded inside the first PC member so that the coupler is exposed to the front of the first PC member. The front of the first PC member is formed of a rectangular high-performance concrete block, and a pair of upper and lower fastening holes are formed to penetrate the front and rear by a sleeve. A fireproof bracket is provided with tie bars inside to surround and restrain the concrete surrounding the fastening holes. This bracket is fixed by a fastening bolt, which is a high-strength bolt that penetrates the fastening holes and is screw-coupled to the coupler of the first PC member. Around the fastening holes on the front of the fireproof bracket A receiving groove is formed and non-shrink mortar is filled into the receiving groove, and the second PC member is characterized in that its end is mounted on the upper part of the refractory bracket.

Description

Technology Field

[0001] The present invention relates to a PC member joining structure using a fireproof bracket, wherein a PC horizontal member is mounted and joined on top of a fireproof bracket, which is a high-performance concrete block screw-coupled with a fastening bolt to a coupler embedded inside a PC vertical member, thereby eliminating the need for welding and fireproofing processes and providing excellent manufacturability and constructability due to the simple shape of the joined PC members. Background Technology

[0003] Conventional reinforced concrete (RC) structures are constructed by installing formwork and reinforcing bars on-site, followed by pouring and curing the concrete.

[0004] Consequently, it takes a long time to complete and it is difficult to ensure uniform quality, and there are difficulties in labor supply due to the large number of personnel required on-site. In addition, since separate temporary materials must be installed externally to support the formwork, additional processes for installing and dismantling the materials and removing the formwork are required. Furthermore, interference from the temporary materials can cause inconvenience to workers' movement and pose a significant risk of safety accidents.

[0005] Therefore, the application of the PC method, which involves bringing precast concrete components manufactured in a factory to the site for installation, has recently increased significantly.

[0006] Since the PC method involves manufacturing components in a factory, on-site processes are minimized, allowing for shorter construction periods and minimizing the impact of labor supply conditions. Additionally, the high precision of the components enables precise construction and ensures excellent quality.

[0007] However, unlike the RC method, where the joints between members are constructed as a single unit, the PC method requires separate details for the joints between members because individual members are brought to the site and assembled.

[0008] In the case of joining PC horizontal members, such as beams or slabs, to PC vertical members, such as columns or walls, the PC horizontal member is placed on top of the PC vertical member and temporarily installed, and then concrete is poured at the joint to integrate the joint between the PC horizontal member and the PC vertical member (Registered Patent No. 10-0644745, etc.).

[0009] However, in this case, additional separate rebar placement and concrete pouring processes are required on-site, which is cumbersome. Furthermore, in order to mount the PC horizontal members on top of the PC vertical members, segmentation of the PC vertical members at the horizontal members' positions is unavoidable, resulting in reduced manufacturability and constructability of the PC members.

[0010] To solve this problem, a technique is used in which a steel bracket is protruded from a PC vertical member and the end of a PC horizontal member is mounted on the upper part of the steel bracket (Registered Patent No. 10-2372473, Registered Patent No. 10-1022404, Published Patent No. 10-2020-0123654, etc.). Since the PC horizontal member is mounted on the upper part of the bracket, segmentation is not required even when PC vertical members are formed in multiple layers.

[0011] However, since the steel brackets require separate fire-resistant treatment, an on-site fire-resistant process is added after the installation of the PC components.

[0012] Furthermore, if steel brackets are attached to PC members in advance, the manufacturing efficiency of the PC members decreases, and handling and transportation become difficult. Conversely, if steel brackets are attached to PC members afterward, steel plates must be embedded in the PC members in advance for bracket connection; additionally, the work becomes cumbersome due to on-site welding, and issues such as fire hazards caused by working with open flames and degradation of on-site welding quality arise. The problem to be solved

[0014] To solve the above-mentioned problems, the present invention aims to provide a PC member joining structure using a fireproof bracket that can be post-attached to the PC member without welding, thereby eliminating the need for separate fireproofing treatment.

[0015] The present invention aims to provide a PC member joining structure using a fireproof bracket that can improve manufacturing and construction efficiency by simplifying the shapes of PC vertical and PC horizontal members. means of solving the problem

[0017] The present invention, according to a preferred embodiment, is for installing a second PC member, which is a slab or beam, on a first PC member, which is a wall or column, wherein a coupler is embedded inside the first PC member so that the coupler is exposed to the front of the first PC member, and the front of the first PC member is formed of a high-performance concrete block in the shape of a rectangular parallepiped, and a pair of upper and lower fastening holes are formed that penetrate the front and rear by a sleeve, and a fireproof bracket is provided inside with tie reinforcing bars that surround and restrain the concrete around the fastening holes, and is fixed by a fastening bolt which is a high-strength bolt that penetrates the fastening holes and is screw-coupled to the coupler of the first PC member, wherein a receiving groove is formed around the fastening holes on the front of the fireproof bracket and non-shrink mortar is filled into the receiving groove, and the end of the second PC member is mounted on the upper part of the fireproof bracket.

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[0021] According to another preferred embodiment, the present invention provides a PC member joining structure using a fireproof bracket, characterized in that the fireproof bracket is composed of at least two bracket units that are divided left and right and joined to each other by connecting bolts that penetrate in the transverse direction.

[0022] According to another preferred embodiment, the present invention provides a PC member joining structure using a fireproof bracket, characterized in that the second PC member is a wide beam with stepped portions formed on both ends of the upper surface, and adjacent second PC members in the transverse direction are spaced apart from each other, and a third PC member, which is a slab in a direction perpendicular to the second PC member, is mounted on the stepped portion between the spaced-apart second PC members.

[0023] According to another preferred embodiment, the present invention provides a PC member joining structure using a fireproof bracket, characterized in that the first PC member is a wall without internal hollows, and between adjacent first PC members, a fourth PC member is provided, which is a hollow wall with a plurality of internal hollows formed vertically.

[0024] According to another preferred embodiment, the present invention provides a PC member joining structure using a fireproof bracket, characterized in that the second PC member is a slab arranged continuously in the transverse direction.

[0025] According to another preferred embodiment, the present invention provides a PC member joining structure using a fireproof bracket, characterized in that a support beam arranged transversely is mounted on the upper part of an adjacent pair of fireproof brackets, and the second PC member is mounted on the upper part of the support beam. Effects of the invention

[0027] According to the present invention, by screwing a fireproof bracket, which is a high-performance concrete block in the shape of a rectangular parallelepiped, into a coupler embedded inside a vertical PC member using a fastening bolt, a PC member horizontal member can be simply mounted and joined on top of the fireproof bracket, thereby providing a PC member joining structure using a fireproof bracket.

[0028] Accordingly, first, PC vertical and horizontal members can be joined without a separate welding process, and since the vertical members do not need to be segmented, the shape of the members is simple, resulting in excellent manufacturability and constructability.

[0029] Second, since the fireproof bracket is constructed using high-performance concrete with excellent fire resistance, separate fireproofing treatment is unnecessary after the assembly and installation of the PC members.

[0030] Third, since the assembly of PC members can be completed with only the processes of attaching fire-resistant brackets to vertical members and mounting horizontal members on fire-resistant brackets, it offers excellent assembly efficiency and allows for rapid construction. Brief explanation of the drawing

[0032] FIG. 1 is a bottom perspective view illustrating a PC member joining structure using the fireproof bracket of the present invention. FIG. 2 is a perspective view illustrating an embodiment of a refractory bracket. FIG. 3 is a perspective view illustrating another embodiment of a refractory bracket. FIG. 4 is a perspective view illustrating the connection relationship between a fireproof bracket and a first PC member. FIG. 5 is a perspective view illustrating a state in which a fireproof bracket equipped with a friction pad is coupled to a first PC member. FIG. 6 is a perspective view illustrating an embodiment of a fireproof bracket equipped with a sleeve and a tie bar. FIG. 7 is a perspective view illustrating another embodiment of a fireproof bracket equipped with a sleeve and a tie bar. FIG. 8 is a perspective view illustrating multiple tie bars integrated by connecting wires. FIG. 9 is a perspective view showing a state in which non-shrink mortar is filled in the receiving groove of a refractory bracket. FIG. 10 is a perspective view illustrating the connection relationship of bracket units. FIG. 11 is a perspective view illustrating the assembled state of the bracket unit. FIG. 12 is a perspective view showing a state in which non-shrink mortar is filled in the receiving groove on the side of the bracket unit. FIG. 13 is a perspective view illustrating an embodiment in which friction pads are provided between bracket units. FIG. 14 is a perspective view illustrating an embodiment in which a third PC member is installed between second PC members. FIG. 15 is a perspective view illustrating an embodiment in which a fourth PC member is installed between first PC members. FIG. 16 is a bottom perspective view illustrating an embodiment in which the second PC member is a slab. Specific details for implementing the invention

[0033] The present invention will be described in detail below according to the attached drawings and preferred embodiments.

[0035] FIG. 1 is a bottom perspective view illustrating a PC member joining structure using the fireproof bracket of the present invention. FIG. 2 is a perspective view illustrating an embodiment of the fireproof bracket, FIG. 3 is a perspective view illustrating another embodiment of the fireproof bracket, and FIG. 4 is a perspective view illustrating the joining relationship between the fireproof bracket and the first PC member.

[0036] As illustrated in FIGS. 1 to 4, the PC member joining structure using the fireproof bracket of the present invention is for installing a second PC member (2), which is a slab or beam, on a first PC member (1), which is a wall or column. A coupler (11) is embedded inside the first PC member (1) so that the coupler (11) is exposed to the front of the first PC member (1). On the front of the first PC member (1), a fireproof bracket (5) is formed as a high-performance concrete block in the shape of a rectangular parallepiped and has a fastening hole (51) that penetrates the front and rear. The fireproof bracket (5) is fixed by a fastening bolt (6) that penetrates the fastening hole (51) and is screw-coupled to the coupler (11) of the first PC member (1). The second PC member (2) is characterized in that its end is mounted on the upper part of the fireproof bracket (5).

[0037] The present invention aims to provide a PC member joining structure using a fireproof bracket that can be post-attached to PC members without a welding process, thereby eliminating the need for separate fireproofing treatment, and can improve manufacturing and construction efficiency by simplifying the shapes of the PC vertical and horizontal members to be joined.

[0038] The present invention is for installing a second PC member (2) on a first PC member (1), which is a precast concrete member.

[0039] The first PC member (1) above is a PC member that is a wall or a column.

[0040] The above second PC member (2) is a slab or a beam PC member.

[0041] A coupler (11) is embedded inside the first PC member (1), and the coupler (11) is provided to be exposed to the front of the first PC member (1).

[0042] A plurality of fireproof brackets (5) are attached to the front surface of the first PC member (1).

[0043] Here, ‘front side’ means the side where the second PC member (2) is joined.

[0044] The above fireproof brackets (5) may be provided in multiple numbers so as to be spaced apart from each other in the transverse direction.

[0045] The above fireproof bracket (5) is formed in the shape of a rectangular block and is made of high-performance concrete (HPC).

[0046] The aforementioned high-performance concrete possesses high strength, high durability, and high fluidity. Its tensile strength, as well as its compressive strength, is significantly superior to that of ordinary concrete, resulting in excellent structural performance. Furthermore, its high fluidity provides good moldability.

[0047] The above high-performance concrete includes ultra-high-performance concrete (UHPC).

[0048] By using high-performance concrete with such high strength, the size of the fireproof bracket (5) can be reduced, and the amount of reinforcement can be minimized due to the high tensile strength. In addition, due to the high flexural strength and tensile strength, brittle fracture can be prevented, allowing for excellent shear strength. Furthermore, high-performance concrete ensures sufficient quality even when the size is reduced due to its high density and filling properties, and allows for the production of a large quantity of products in a short period of time due to rapid strength enhancement. Moreover, high-performance concrete has fire-resistant properties, so no separate fire-resistant treatment is required after the assembly and installation of the PC member.

[0049] A fastening hole (51) that penetrates through the above fireproof bracket (5) is formed in the front and back.

[0050] A fastening bolt (6) passes through the fastening hole (51) and is screw-coupled to a coupler (11) embedded in the first PC member (1), thereby fixing the fireproof bracket (5) to the front surface of the first PC member (1) (Fig. 4).

[0051] A fixing member (12) for fixing the coupler (11) may be attached to the inner end of the above coupler (11) (Fig. 4).

[0052] In order to securely and stably fix the fireproof bracket (5) to the front surface of the first PC member (1), a pair of fastening holes (51) may be provided spaced apart vertically (Fig. 2). That is, the fireproof bracket (5) can be joined to the first PC member (1) by a pair of vertical fastening bolts (6).

[0053] If the above fastening bolts (6) are provided in a pair, stable support is possible even if a defect occurs in one of the fastening bolts (6).

[0054] When the magnitude of the applied load is large, the width of the fireproof bracket (5) is expanded, and the fastening holes (51) arranged vertically are arranged in two rows horizontally, so that the fireproof bracket (5) can be fixed to the first PC member (1) with four fastening bolts (6) (Fig. 3).

[0055] The end of the second PC member (2) is mounted on the upper part of the fireproof bracket (5).

[0056] That is, the second PC member (2) is joined to the first PC member (1) in a simple support manner.

[0057] As such, the present invention allows the assembly of PC members to be completed with only the process of joining a fireproof bracket (5) to the first PC member (1) and mounting a second PC member (2) on the fireproof bracket (5). Therefore, assembly is excellent and construction can be done quickly. In addition, since the PC members do not need to be segmented, the shape of the members is simple, resulting in excellent manufacturability and constructability.

[0058] After fastening the fastening bolt (6) into the fastening hole (51), the inside of the fastening hole (51) is filled with a filler such as epoxy to prevent slipping and corrosion of the fastening bolt (6) due to the gap between the fastening bolt (6) and the fastening hole (51).

[0059] The above fastening bolt (6) may be provided with a washer plate (61) on the head side.

[0061] FIG. 5 is a perspective view illustrating a state in which a fireproof bracket equipped with a friction pad is coupled to a first PC member.

[0062] The above fastening bolt (6) may be a high-strength bolt.

[0063] Since the back surface of the above fireproof bracket (5) is in close contact with the front surface of the first PC member (1), it is more efficient to transfer the load by frictional force at the joint surface rather than by direct shearing of the fastening bolt (6).

[0064] In addition, since the inner diameter of the fastening hole (51) of the fireproof bracket (5) is larger than the outer diameter of the fastening bolt (6) and there is a gap between them, friction joining is advantageous to prevent slipping of the fireproof bracket (5) when a load is applied.

[0065] Therefore, it is desirable to introduce a high tightening force by using a high-strength bolt as the fastening bolt (6) so that the fireproof bracket (5) can be frictionally joined to the first PC member (1).

[0066] The above high-strength bolt has a higher tensile strength compared to a standard bolt. Therefore, since stress is transmitted by the frictional force generated at the joint surface between the fireproof bracket (5) and the first PC member (1) by the strong bolt tightening force, the flow of stress is smooth and the rigidity of the joint is high. In addition, since stress is transmitted at the joint surface of the members, localized stress concentration can be mitigated.

[0067] In order to maximize frictional bonding force at the joint surface between the fireproof bracket (5) and the first PC member (1), the back surface of the fireproof bracket (5) can be roughened to form irregularities.

[0068] Alternatively, as shown in FIG. 5, a separate friction pad (53) may be provided on the back surface of the fireproof bracket (5).

[0070] FIG. 6 is a perspective view illustrating an embodiment of a fireproof bracket equipped with a sleeve and a tie bar, FIG. 7 is a perspective view illustrating another embodiment of a fireproof bracket equipped with a sleeve and a tie bar, and FIG. 8 is a perspective view illustrating a plurality of tie bars integrated by a connecting wire.

[0071] As shown in FIGS. 6 and 7, the fastening holes (51) of the fireproof bracket (5) can be formed in an upper and lower pair by a sleeve (52) that is embedded to penetrate the fireproof bracket (5).

[0072] In order to prevent local destruction of the fireproof bracket (5) due to stress concentration at the point where a fastening bolt (6), which has a relatively smaller diameter than the fastening hole (51), comes into contact with the inner surface of the fastening hole (51) when manufacturing the fireproof bracket (5), a sleeve (52) that penetrates forward and backward may be embedded inside the fireproof bracket (5).

[0073] The sleeve (52) above may be a steel pipe.

[0074] When a high-strength bolt is used as the fastening bolt (6) to join the fireproof bracket (5) to the first PC member (1) by friction joining, if the length of the sleeve (52) is greater than or equal to the front-to-back length of the fireproof bracket (5), the tightening force of the fastening bolt (6) is transmitted only to the sleeve (52) and not to the fireproof bracket (5), so sufficient friction force cannot be exerted at the joint surface between the fireproof bracket (5) and the first PC member (1).

[0075] Therefore, it is preferable to form the sleeve (52) with a length shorter than the front-to-back length of the fireproof bracket (5) so that the tightening force of the fastening bolt (6) can be directly transmitted to the fireproof bracket (5).

[0076] In this case, by widening the opening of the fastening hole (51) at the front and / or rear of the sleeve (52) so that it slopes outward, stress concentration around the end of the sleeve (52) can be relieved and the entry of the fastening bolt (6) can be guided.

[0077] Meanwhile, stress concentration may occur around the fastening hole (51) to which the fastening bolt (6) is joined. Therefore, to reinforce this, a tie bar (54) that surrounds and restrains the concrete around the fastening hole (51) may be provided inside the fireproof bracket (5) (Figs. 6 to 8).

[0078] The above-mentioned tie bars (54) may be provided in multiple rows spaced apart from each other in the front-rear direction. In this case, the multiple tie bars (54) can be interconnected by connecting wires (541) that cross over them, thereby allowing the multiple tie bars (54) to be arranged collectively (Fig. 8).

[0080] FIG. 9 is a perspective view showing a state in which non-shrink mortar is filled in the receiving groove of a refractory bracket.

[0081] As illustrated in FIG. 2, FIG. 9, etc., a receiving groove (55) may be formed around the fastening hole (51) on the front of the fireproof bracket (5).

[0082] The above fireproof bracket (5) is joined to the first PC member (1) by a fastening bolt (6) that passes through the fastening hole (51). At this time, frictional joining between the fireproof bracket (5) and the first PC member (1) is achieved by the head pressure of the fastening bolt (6).

[0083] However, if the head of the above-mentioned fastening bolt (6) protrudes to the front of the fireproof bracket (5), it not only damages the appearance but also makes fireproofing difficult and there is a risk that the fastening bolt (6) will loosen.

[0084] Accordingly, in order to prevent the head of the fastening bolt (6) from protruding outside the fireproof bracket (5), a receiving groove (55) communicating with the fastening hole (51) can be formed on the front surface of the fireproof bracket (5) to a predetermined depth.

[0085] The head of the fastening bolt (6) is received in the receiving groove (55) above.

[0086] After fastening the above-mentioned fastening bolt (6), non-shrink mortar (M) or the like can be filled into the receiving groove (55) so that the fastening bolt (6) is not exposed to the outside (Fig. 9).

[0087] In this way, when the head of the fastening bolt (6) is embedded inside the non-shrink mortar (M), safety can be ensured in case of fire, and the loosening of the fastening bolt (6) during use can be prevented.

[0088] When a pair of the above-mentioned fastening holes (51) are provided spaced apart vertically, the receiving groove (55) can be formed with a longer vertical length to communicate with both the upper and lower pair of fastening holes (51).

[0090] FIG. 10 is a perspective view illustrating the connection relationship of bracket units, and FIG. 11 is a perspective view illustrating the connection state of bracket units. FIG. 12 is a perspective view illustrating a state in which non-shrink mortar is filled in the receiving groove on the side of a bracket unit, and FIG. 13 is a perspective view illustrating an embodiment in which friction pads are provided between bracket units.

[0091] As illustrated in FIGS. 10 to 13, the fireproof bracket (5) may be composed of at least two bracket units (5a, 5b) that are divided left and right and joined to each other by connecting bolts (7) that penetrate in the transverse direction.

[0092] When the load applied to the above fireproof bracket (5) is large, a high-load fireproof bracket (5) as shown in Fig. 3 can be used, which is configured by making the width larger than that of the low-load fireproof bracket (5) as shown in Fig. 2 and arranging the fastening bolts (6) in two rows on the left and right.

[0093] However, in this case, since the low-load fireproof bracket (5) and the high-load fireproof bracket (5) must be manufactured with different specifications, production and management efficiency may be reduced.

[0094] Therefore, by connecting the minimum width bracket units (5a, 5b) laterally as needed to form a fireproof bracket (5), it can be configured to be used for various loads.

[0095] Each of the above bracket units (5a, 5b) has a fastening hole (51) formed therein so that a fastening bolt (6) can be fastened.

[0096] A connecting hole (56) penetrating in the transverse direction may be formed in the bracket unit (5a, 5b) so that a plurality of bracket units (5a, 5b) can be joined together integrally.

[0097] A plurality of bracket units (5a, 5b) can be fixed as a single unit by fastening a connecting bolt (7) through the above connecting hole (56) (Fig. 10).

[0098] A receiving groove (57) for receiving the head of the connecting bolt (7) may be formed on one side of the bracket unit (5a, 5b). After the connecting bolt (7) is fastened, non-shrink mortar (M) may be filled into the receiving groove (57).

[0099] In FIGS. 10 to 13, an embodiment in which two bracket units (5a, 5b) are connected in the transverse direction is shown, but if necessary, three or more bracket units (5a, 5b) can be connected in the transverse direction for use.

[0100] A friction pad (53) may be interposed between adjacent bracket units (5a, 5b) on the left and right sides so that frictional bonding is reliably formed (Fig. 13).

[0102] FIG. 14 is a perspective view illustrating an embodiment in which a third PC member is installed between second PC members.

[0103] As illustrated in FIG. 14, the second PC member (2) is a wide beam with stepped portions (21) formed on both ends of the upper surface, and adjacent second PC members (2) in the transverse direction are spaced apart from each other, and a third PC member (3), which is a slab in a direction perpendicular to the second PC member (2), can be mounted on the stepped portions (21) between the spaced-apart second PC members (2).

[0104] Since the second PC member (2) is joined in a simple support manner, the joint between the second PC member (2) and the fireproof bracket (5) cannot exert support against lateral movement.

[0105] Therefore, the present invention is suitable for underground structures with low lateral force influence, particularly for the construction of underground parking lot slabs.

[0106] In addition, it is desirable to minimize lateral movement by installing the second PC members (2) mounted on the upper part of the fireproof bracket (5) so that they come into contact with each other in the lateral direction and support each other.

[0107] To this end, when the second PC member (2) mounted on the upper part of the fireproof bracket (5) is visible, the second PC member (2) is formed as a wide beam with a width greater than its height, and a stepped portion (21) is formed on both ends of the upper surface of the second PC member (2) that is a wide beam, so that a third PC member (3) can be installed laterally between adjacent second PC members (2).

[0108] At this time, the third PC member (3) is a slab PC member, and its end is mounted on the stepped portion (21) of the second PC member (2).

[0109] Accordingly, even if the second PC member (2) is simply mounted on the upper part of the fireproof bracket (5), it can be supported by the third PC member (3) and prevented from moving in the lateral direction.

[0110] It is preferable that the height of the step portion (21) be formed to be greater than half the thickness of the third PC member (3) so that the third PC member (3) between adjacent second PC members (2) can stably support the second PC member (2) in the lateral direction. Accordingly, the cross-sectional center of the third PC member (3) can be located within the thickness of the second PC member (2).

[0111] The above third PC member (3) may be a hollow PC slab having multiple rows of hollows (31) formed inside.

[0113] FIG. 15 is a perspective view illustrating an embodiment in which a fourth PC member is installed between first PC members.

[0114] As illustrated in FIG. 15, the first PC member (1) is a wall without a hollow interior, and between adjacent first PC members (1), a fourth PC member (4) may be provided, which is a hollow wall with a plurality of hollow interiors (41) formed vertically inside.

[0115] When the vertical member is a wall, a hollow PC wall can be used, which has multiple hollows (41) formed inside, is lightweight, easy to assemble, and has a low manufacturing cost.

[0116] However, the above hollow PC wall makes it difficult to embed couplers (11), etc. inside, and if the fastening bolts (6) are fastened with high force, there is a risk of local destruction of the concrete.

[0117] Accordingly, when the second PC member (2) adjacent in the lateral direction is spaced apart from each other, the first PC member (1) can also be spaced apart from the first PC member (1) adjacent in the lateral direction. In this case, only the first PC member (1) to which the fireproof bracket (5) is joined uses a solid PC wall, and a fourth PC member (4), which is a hollow PC wall, can be installed between the first PC members (1) to which the fireproof bracket (5) is not joined.

[0119] FIG. 16 is a bottom perspective view illustrating an embodiment in which the second PC member is a slab.

[0120] As shown in FIG. 16, the second PC member (2) may be composed of slabs arranged continuously in the transverse direction.

[0121] In order to support the second PC member (2) that is simply mounted on the upper part of the fireproof bracket (5) in the lateral direction, the second PC member (2), which is a slab, can be arranged continuously so as to come into contact with each other.

[0122] At this time, the second PC member (2) may be a hollow PC slab.

[0123] Additionally, a support beam (8) arranged transversely is mounted on the upper part of a pair of adjacent fireproof brackets (5), and the second PC member (2) can be mounted on the upper part of the support beam (8).

[0124] When the second PC member (2), which is a PC slab, is arranged continuously in the transverse direction, if a pair of fireproof brackets (5) is provided for each second PC member (2), the number of installation locations for the fireproof brackets (5) becomes excessively large, and the constructability is reduced.

[0125] Accordingly, a support beam (8) may be provided to simultaneously support multiple second PC members (2) with a minimum number of fireproof brackets (5).

[0126] The above support beam (8) is composed of PC members arranged horizontally and can have both ends mounted on the upper part of an adjacent pair of fireproof brackets (5).

[0127] The above second PC member (2) has both ends mounted on the upper part of the support beam (8).

[0128] Accordingly, the second PC member (2) can be installed even if a fireproof bracket (5) is not provided directly below the second PC member (2). Explanation of the symbols

[0130] 1: First PC component 11: Coupler 12: Absence of settlement 2: 2nd PC Absence 21: Step 3: Third PC absence 31: Communist China 4: 4th PC Absence 41: Communist China 5: Fireproof bracket 5a, 5b: Bracket unit 51: Fastener 52: Sleeve 53: Friction pad 54: Stirring bar 541: Connecting wire 55: Acceptance Home 56: Connecting hole 57: Acceptance Home 6: Fastening bolt 61: Washer plate 7: Connecting bolt 8: Support beam M: Non-shrink mortar

Claims

Claim 1 The invention is for installing a second PC member (2), which is a slab or beam, on a first PC member (1), which is a wall or column, wherein a coupler (11) is embedded inside the first PC member (1) and the coupler (11) is exposed to the front of the first PC member (1), and the front of the first PC member (1) is formed of a high-performance concrete block in the shape of a rectangular parallelepiped, and a pair of upper and lower fastening holes (51) that penetrate the front and rear by a sleeve (52) are formed, and a fireproof bracket (5) equipped with a tie bar (54) that surrounds and restrains the concrete around the fastening holes (51) is fixed by a fastening bolt (6), which is a high-strength bolt that penetrates the fastening holes (51) and is screw-coupled to the coupler (11) of the first PC member (1), wherein a receiving groove (55) is formed around the fastening holes (51) on the front of the fireproof bracket (5), and the A PC member joining structure using a fireproof bracket, characterized in that non-shrink mortar (M) is filled into the receiving groove (55), and the end of the second PC member (2) is mounted on the upper part of the fireproof bracket (5). Claim 2 delete Claim 3 delete Claim 4 delete Claim 5 A PC member joining structure using a fireproof bracket according to claim 1, characterized in that the fireproof bracket (5) is composed of at least two bracket units (5a, 5b) that are divided left and right and joined to each other by a connecting bolt (7) that penetrates in the transverse direction. Claim 6 A PC member joining structure using a fireproof bracket according to claim 1, wherein the second PC member (2) is a wide beam having stepped portions (21) formed on both ends of the upper surface, and adjacent second PC members (2) in the transverse direction are spaced apart from each other, and a third PC member (3), which is a slab in a direction perpendicular to the second PC member (2), is mounted on the stepped portions (21) between the spaced-apart second PC members (2). Claim 7 A PC member joining structure using a fireproof bracket, characterized in that, in claim 6, the first PC member (1) is a wall without a hollow inside, and between adjacent first PC members (1), a fourth PC member (4) is provided, which is a hollow wall with a plurality of hollows (41) formed vertically inside. Claim 8 A PC member joining structure using a fireproof bracket, characterized in that, in claim 1, the second PC member (2) is a slab arranged continuously in the transverse direction. Claim 9 A PC member joining structure using a fireproof bracket, characterized in that, in claim 8, a support beam (8) arranged transversely is mounted on the upper part of an adjacent pair of fireproof brackets (5), and the second PC member (2) is mounted on the upper part of the support beam (8).

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