Prefabricated column and connecting structure of prefabricated column and prefabricated beam

Abstract

The utility model provides a prefabricated column and a connecting structure of the prefabricated column and a prefabricated beam, the prefabricated column comprises a column body and a second steel connector arranged on the side face of the column body, and the connecting structure comprises a first steel connector and the second steel connector which are arranged at the beam end; the first steel connector is I-shaped, the pre-embedded upper and lower flanges of the first steel connector are in lap welding connection with the longitudinal bars in the beam, the pre-embedded web plate is provided with a hole and / or a welding stud, and the exposed web plate is provided with a bolt hole; the second steel connector comprises I-shaped steel, an anchor plate and a plurality of anchor bars, the anchor plate and the I-shaped steel are located inside and outside the column respectively, part of the first anchor bar is located inside the column, part of the first anchor bar is located outside the column and is in lap welding with an upper flange and a lower flange of the I-shaped steel, and the second anchor bar is located inside the column and is welded with the anchor plate. The webs are connected through bolts, and stirrups are arranged on the embedded portion of the first steel connector and the connecting area of the two steel connectors respectively. The structure is simple, the steel consumption of the connecting joint can be reduced, and construction is convenient.

Description

Technical Field

[0001] The present invention relates to the field of prefabricated structures, and in particular to a prefabricated column and a connection structure between the prefabricated column and a prefabricated beam. Background Art

[0002] Steel connectors are a type of intermediary component used to connect beams to columns. With the increasing degree of industrial automation and the widespread application of prefabricated concrete frame structures, the demand for beam-column connection methods is increasing, and beam-column connection methods are becoming more and more diverse.

[0003] In the current existing technology, the main form of using steel connectors as beam-column connections is to embed steel connectors at the beam ends, embed box-type column connectors at the column ends, and other steel plates to achieve beam-column connections. Although this connection method is reliable, the connection node is a pure steel structure, the amount of steel used is large, which makes the engineering application uneconomical, and the structural system is no longer a frame structure system. The force transmission mechanism is complex and requires special research.

[0004] Therefore, how to reduce the amount of structural steel and achieve reliable connection between beams and columns, and utilize the theory of mature frame structure systems, has become a technical problem that technical personnel in this field urgently need to solve. Utility Model Content

[0005] The present disclosure aims to solve at least one of the technical problems existing in the prior art.

[0006] To this end, the present invention provides a prefabricated column and a connection structure with a prefabricated beam, which realizes the connection of beam-column components in an assembled concrete frame structure through bolt-welding connection as a medium, mainly solving the problem of large amount of steel used in connection nodes leading to uneconomical engineering application and reducing the amount of temporary support and concrete wet work.

[0007] To achieve the above objectives, the present disclosure adopts the following technical solutions:

[0008] A first aspect of the present disclosure provides a prefabricated column, comprising:

[0009] The shaft of a precast concrete column;

[0010] The second steel connecting head is arranged on the side of the column body, which is partially embedded in the column and partially exposed. The second steel connecting head includes an I-beam, an anchor plate and a plurality of anchor bars. The I-beam is located outside the column, and the anchor plate is located inside the column. The first anchor bar is partially located inside the column and partially located outside the column and is connected to the upper flange and the lower flange of the I-beam by lap welding. The second anchor bar is located in the column and welded to the anchor plate. Bolt holes are opened on the web of the I-beam.

[0011] In some embodiments, the web of the I-beam is a whole flat plate or is composed of two independent flat plates, and the two independent flat plates respectively form a T-shaped steel with the upper flange and the lower flange of the I-beam.

[0012] A second aspect of the present disclosure provides a connection structure of a prefabricated column and a prefabricated beam, comprising:

[0013] A first steel connector is provided at an end of the precast concrete beam, part of which is embedded in the beam and part of which is exposed. The first steel connector is in an I-shape as a whole, and includes a first upper flange, a first lower flange and a first web that are fixedly connected. The dimensions of the first upper flange and the first lower flange along the axial direction of the precast concrete beam are smaller than the dimensions of the first web along the axial direction of the precast concrete beam. The first upper flange and the first lower flange of the embedded part are connected to the longitudinal reinforcement in the beam by lap welding. First stirrups that surround the first steel connector are evenly arranged on the embedded part. A first hole and / or a welded stud are provided on the first web of the embedded part; and a first bolt hole is provided on the first web of the exposed part.

[0014] The second steel connection head is arranged on the side of the column body of the precast concrete column, part of which is embedded in the column and part of which is exposed. The second steel connection head includes an I-shaped steel, an anchor plate and a plurality of anchor bars. The I-shaped steel is located outside the column, the anchor plate is located inside the column, the first anchor bar is located partially inside the column and partially outside the column and is connected to the second upper flange and the second lower flange of the I-shaped steel by lap welding, the second anchor bar is located inside the column and welded to the anchor plate; the second upper flange and the second lower flange are welded to the first upper flange and the first lower flange respectively, a second bolt hole matching the first bolt hole is opened on the second web of the I-shaped steel, the connection between the first web and the second web is achieved by bolts, the bolts connecting the first web and the second web meet the requirements of high-strength bolt friction type connection, the size of the second upper flange and the second lower flange along the axial direction of the precast concrete beam is smaller than the size of the second web along the axial direction of the precast concrete beam, and second stirrups surrounding the first web and the second web are evenly arranged in the connection area between the first web and the second web.

[0015] In some embodiments, the first web is a whole plane plate or is composed of two independent plane plates, and the two independent plane plates respectively form a T-shaped steel with the first upper flange and the first lower flange; the structure of the second web is consistent with the structure of the first web.

[0016] In some embodiments, one end of the second web and one end of the second anchor bar are both butt-welded to the anchor plate by T-shape.

[0017] In some embodiments, the first anchor bar and the second anchor bar should be arranged away from the longitudinal bars in the column.

[0018] In some embodiments, when the first anchor bar is overlap-welded to the second upper flange and the second lower flange using single-sided welds or double-sided welds, the overlap lengths are not less than 10 times and 5 times the diameter of the first anchor bar, respectively.

[0019] In some embodiments, the distance from the center of the second anchor bar to the edge of the anchor plate should not be less than the larger value of 2 times the diameter of the second anchor bar and 20 mm.

[0020] In some embodiments, the first anchor bar embedded in the second steel connection head of the precast concrete side column is bent and anchored in the column body.

[0021] In summary, the present invention has a simple structure, clear force, and is easy to manufacture. The prefabricated beams and columns on the construction site are dry-connected, and no temporary support and a small amount of wet concrete work are required. The construction is convenient and quick, which can effectively shorten the construction period and reduce the cost of construction measures. In addition, the amount of steel used in the connection nodes can be saved, reducing the construction cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present disclosure is further described in detail below with reference to the accompanying drawings.

[0023] Figure 1 A schematic diagram of a connection structure of a prefabricated column and a prefabricated beam provided in an embodiment of the present disclosure.

[0024] Figure 2 for Figure 1 AA cross section diagram in.

[0025] Figure 3 (a) to (c) are Figure 1 Schematic diagram of the structure of the precast concrete beam and the first steel connection head at its end.

[0026] Figure 4 (a) to (e) are schematic structural diagrams of the middle-level precast concrete center column, side column and the second steel connector on its side in the embodiment of the present disclosure.

[0027] Figure 5 (a) and (b) are schematic structural diagrams of the top precast concrete middle column, side column and the second steel connector on its side in the embodiment of the present disclosure.

[0028] Figure 6 A schematic diagram of a connection structure of a prefabricated column and a prefabricated beam provided in another embodiment of the present disclosure.

[0029] Figure 7 (a) to (c) are Figure 6 Schematic diagram of the structure of the precast concrete beam and the first steel connection head at its end.

[0030] Figure 8 (a) to (c) are Figure 6 Schematic diagram of the structure of the precast concrete column and the second steel connection head at its end.

[0031] In the figure:

[0032] In the figure:

[0033] 10-first steel connection head, 11-first upper flange, 12-first lower flange, 13, 013-first web, 131-first hole, 132, stud, 133-first bolt hole, 14-first stirrup;

[0034] 20-second steel connection head, 21-first upper flange, 22-second lower flange, 23, 023-second web, 231-second bolt hole, 24-anchor plate, 25-first anchor bar, 26-second anchor bar, 27-second stirrup;

[0035] 30-precast concrete beam, 31-longitudinal reinforcement in beam;

[0036] 40-Precast concrete columns. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0038] On the contrary, the present application covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present application as defined by the claims. Further, in order to make the public have a better understanding of the present application, some specific details are described in detail in the detailed description of the present application below. Those skilled in the art can fully understand the present application without the description of these details.

[0039] In the description of the present disclosure, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the basis or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present disclosure. In addition, the terms "first" and "second" are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present disclosure, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0040] In the description of the present disclosure, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0041] In the present disclosure, unless otherwise expressly specified and limited, a first feature being “above” or “below” a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being “above”, “above”, and “above” a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0042] See also Figure 1 , Figure 2 , a connection structure of a prefabricated column and a prefabricated beam provided by an embodiment of the present disclosure includes:

[0043] The first steel connector 10 is arranged at the end of the precast concrete beam 30, part of which is embedded in the beam and part of which is exposed. The first steel connector 10 is in an I-shape as a whole, and includes a first upper flange 11, a first lower flange 12 and a first web 13 that are fixedly connected. The first upper flange 11 and the first lower flange 12 of the embedded part are connected to the longitudinal reinforcement in the beam by lap welding. The first stirrups 14 that surround the first steel connector 10 are evenly arranged in the embedded part. The first web 13 of the embedded part is provided with a first hole 131 and / or a welding stud 132; the first web 13 of the exposed part is provided with a first bolt hole 133;

[0044] The second steel connector 20 is arranged on the side of the column body of the precast concrete column 40, and is partially embedded in the column and partially exposed. The second steel connector 20 includes an I-shaped steel, an anchor plate 24 and a plurality of anchor bars. The I-shaped steel is located outside the column, the anchor plate 24 is located inside the column, and the outer surface of the anchor plate 24 is flush with the outer surface of the column body. The first anchor bar 25 is partially located inside the column and partially located outside the column and is connected to the second upper flange 21 and the second lower flange 22 of the I-shaped steel by lap welding. The second anchor bar 26 is located in the column and welded to the anchor plate 24; the second upper flange 21 and the second lower flange 22 are welded to the first upper flange 11 and the first lower flange 12 respectively, and a second bolt hole 231 matching the first bolt hole 133 is opened on the second web 23, and the first web 13 and the second web 23 are connected by bolts, and second stirrups 27 surrounding the first web 13 and the second web 23 are evenly arranged in the connection area.

[0045] According to the connection structure of prefabricated columns and prefabricated beams provided in the embodiment of the first aspect of the present disclosure, dry connection of beams and columns is achieved at the construction site by connecting the steel connecting heads of the beam ends and the sides of the column bodies. The structure is simple, no temporary support is required, and only a small amount of concrete wet work is required. The construction is convenient and quick, which can effectively shorten the construction period and reduce the construction measures cost. In addition, compared with the existing steel connecting head connection method, the connection structure of this embodiment has a low steel content, high economic value, mature force transmission theory, and is easy to use.

[0046] In some embodiments, see Figure 3(a) to (c) are first steel connectors 10 embedded in the beam ends, part of which is embedded in the precast concrete beam 30 and part of which is exposed. The lengths of the embedded and exposed parts need to be determined according to calculations and production and construction requirements. The cross-sectional dimensions of the I-shaped steel used in the first steel connector 10 need to be determined according to force calculations. At the same time, it is necessary to ensure that the distance from the edge of the first upper flange 11 and the first lower flange 12 of the embedded part to the concrete surface on both sides is not less than 30 mm, and the distance from the outer surface of the first upper flange 11 and the first lower flange 12 to the upper and lower concrete surfaces is not less than 50 mm. According to the force requirements, a first hole 131 with a diameter of not less than 30 mm and / or a welded stud 132 can be opened on the first web 13 of the embedded part to enhance The connection between the first steel connector 10 and the concrete is to achieve common stress between the two; when the stress requirement is met, in order to facilitate the connection or reduce the steel content, the first upper flange 11 and the first lower flange 12 of the first steel connector 10 can be cut, that is, the size of the first upper flange 11 and the first lower flange 12 along the axial direction of the precast concrete beam 30 is smaller than the size of the first web 13 along the axial direction of the precast concrete beam 30; in order to achieve the beam-column connection, a first bolt hole 133 is opened in the first web 13 of the exposed part of the first steel connector 10. The first bolt hole 133 can be a round hole or an oblong hole along the horizontal direction. It is generally designed according to the high-strength bolt friction type connection. The specifications, spacing, margins, etc. of the bolts should be determined according to the calculation and construction requirements. The upper and lower flanges of the first steel connection head 10 are connected to the upper and lower longitudinal reinforcements 31 of the beam by lap welding. When single-sided welds and double-sided welds are used, the lap lengths are not less than 10 times and 5 times the diameters of the longitudinal reinforcements, respectively. At the same time, the first stirrups 14 are evenly arranged within the embedded range of the first steel connection head 10, and the first stirrups 14 need to surround the first steel connection head 10.

[0047] In some embodiments, see Figure 4Figures (a) to (d) are schematic diagrams of the structure of the second steel connector 20 in the middle-layer precast concrete column 41. A second steel connector 20 is provided on the two opposite sides of the column 41. Each second steel connector 20 is partially embedded in the precast concrete column 40 and partially exposed on the side of the column body. The exposed length needs to be determined according to calculation and production and construction requirements; the cross-sectional size of the I-shaped steel of the second steel connector 20 needs to be determined according to force calculation, and at the same time, it needs to ensure that the distance from the edge of the second upper flange 21 and the second lower flange 22 of the exposed part to the concrete surface on both sides is not less than 30 mm, the distance from the outer surface of the second upper flange 21 and the second lower flange 22 to the upper and lower concrete surfaces is not less than 50 mm, and the second web One end of the plate 23 is butt-welded to the anchor plate 24 embedded in the column by T-shape, and the second upper flange 21, the second lower flange 22 and the first anchor bar 25 are connected by lap welding. When the force requirements are met, in order to facilitate the connection or reduce the steel content, the second upper flange 21 and the second lower flange 22 of the second conversion member 20 can be cut, that is, the axial dimensions of the second upper flange 21 and the second lower flange 22 along the precast concrete beam 30 are smaller than the axial dimensions of the second web 23 along the precast concrete beam 30; in order to realize the beam-column connection, a second bolt hole 231 is opened on the second web 23, and the second bolt hole 231 can be a round hole or an oblong hole along the horizontal direction, and is generally designed according to the high-strength bolt friction type connection, and the specifications of the bolts are , spacing, margins, etc. should be determined according to calculation and construction requirements, and match the size of the first bolt hole 133 on the first web 13 of the first steel connector 10 at the beam end; the anchor plate 24 is connected to the second anchor bar 26 in the column, and the size of the anchor plate 24 is determined according to force calculation; the first anchor bar 25 is partially embedded in the concrete column body and should be set away from the longitudinal reinforcement in the column, and partially exposed in the concrete column body. The number and size of the first anchor bar 25 are determined according to force calculation, and are connected to the second upper flange 21 and the second lower flange 22 by lap welding. When single-sided welds and double-sided welds are used, the lap lengths shall not be less than 10 times and 5 times the diameter of the first anchor bar, respectively; the second anchor bar 26 is embedded in the concrete column body and should be set away from the longitudinal reinforcement in the column. The number and size of the second anchor bars 26 are determined according to force calculations, and one end is welded to the anchor plate 24 by T-shaped welding. The welding method is determined according to the diameter of the second anchor bar 26. The distance from the center of the second anchor bar 26 to the edge of the anchor plate 25 should not be less than the larger value of twice the diameter of the second anchor bar and 20 mm; the second steel connectors 20 embedded on different sides of the same precast concrete column do not share the second anchor bar 26, and the anchor plate 24 on each side is respectively equipped with a second anchor bar 26; for the case where the second steel connectors 20 are arranged on three or four sides of the precast concrete column, the second anchor bars 26 on different anchor plates 24 should be avoided. If the anchoring length of the second anchor bar 26 is long, the second anchor bars 26 on different anchor plates 24 should be avoided in layers.The second stirrups 27 are evenly arranged within the connection range of the first steel connection head 10 and the second steel connection head 20, and the second stirrups 27 need to surround the first steel connection head 10 and the second steel connection head 20 within the connection range. Figure 4 In order to more clearly show the structural characteristics of the I-beam, only part of the second stirrup 27 is shown in (a).

[0048] See also Figure 4 (e) is a schematic diagram of the structure of the second steel connector 20 in the middle-layer precast concrete side column 42. The difference between the second steel connector 20 in the middle-layer precast concrete center column 41 and the middle-layer precast concrete side column 42 is that the first anchor bar 25 in the middle-layer precast concrete side column 42 is bent and anchored in the column body, and its horizontal projection length including the bend should not be less than 0.4 times the basic anchoring length, and the projection length of the bent steel bar including the bend section in the bending plane should not be less than 15 times the steel bar diameter.

[0049] See also Figure 5 (a) and (b) are schematic diagrams of the structure of the second steel connection head in the top precast concrete middle column 43 and the top precast concrete side column 44, respectively. Their structures refer to the structures of the second steel connection head in the middle precast concrete middle column 41 and the middle precast concrete side column 42, respectively, and will not be repeated here.

[0050] In some embodiments, when the beam section height is large, in order to reduce the amount of steel and meet the stress requirements, refer to Figure 6 to Figure 8 The embodiment of the present disclosure provides another connection structure between prefabricated columns and prefabricated beams. Figure 1 to Figure 5 The connection configuration shown differs in that Figure 6 to Figure 8 In the connection structure shown, the first web 013 of the first steel connector 10 is composed of two independent plane plates. Figure 1 to Figure 5 The first web of the I-shaped steel in the first steel connector is disconnected in the middle to form two symmetrical and spaced T-shaped steels; correspondingly, the second web 023 of the second steel connector 20 is also composed of two independent flat plates, that is, the second conversion part is replaced by the I-shaped steel into two symmetrical and spaced T-shaped steels, and the anchor plate 24 can also be disconnected in the middle. Figure 6 to Figure 8 The rest of the connection structure shown is the same as Figure 1 to Figure 5 The connection structures shown are the same and will not be described again here.

[0051] When the beam-column node structure provided by the embodiment of the present disclosure is used, the side of the column body is the second steel connector, and the end of the beam is the first steel connector. The first web of the first steel connector and the second web of the second steel connector on the side of the column body are connected by high-strength bolts and corresponding flange welding is performed. Specifically: the bolt holes in the webs of the first steel connector and the second steel connector are aligned and close, and high-strength bolts are inserted into the bolt holes and tightened according to design requirements, and then the flanges are welded. The connection position is located at the beam-column node, and is generally designed as a high-strength friction type connection. The specifications, spacing, margins, etc. of the bolts should be determined according to calculation and construction requirements. Second stirrups are evenly arranged within the connection range of the first steel connector and the second steel connector, and the second stirrups need to surround the two steel connectors.

[0052] In the description herein and in the accompanying drawings, the products and methods of the present invention are described as specific shapes, materials or process sequences, and some detailed parameters are provided for some specific embodiments for the purpose of illustration. However, it should be understood that these specific descriptions do not limit the technical solutions of the present invention; that is, changes and modifications of the shapes, materials or process sequences are still included in the spirit and scope of the present invention.

Claims

1. A prefabricated column, characterized in that: include: The shaft of a precast concrete column; The second steel connecting head is arranged on the side of the column body, which is partially embedded in the column and partially exposed. The second steel connecting head includes an I-beam, an anchor plate and a plurality of anchor bars. The I-beam is located outside the column, and the anchor plate is located inside the column. The first anchor bar is partially located inside the column and partially located outside the column and is connected to the upper flange and the lower flange of the I-beam by lap welding. The second anchor bar is located in the column and welded to the anchor plate. Bolt holes are opened on the web of the I-beam.

2. The prefabricated column according to claim 1, characterized in that: The web of the I-shaped steel is a whole plane plate or is composed of two independent plane plates, and the two independent plane plates respectively form a T-shaped steel with the upper flange and the lower flange of the I-shaped steel.

3. A connection structure between a prefabricated column and a prefabricated beam, characterized in that: include: A first steel connector is provided at an end of the precast concrete beam, part of which is embedded in the beam and part of which is exposed. The first steel connector is in an I-shape as a whole, and includes a first upper flange, a first lower flange and a first web that are fixedly connected. The dimensions of the first upper flange and the first lower flange along the axial direction of the precast concrete beam are smaller than the dimensions of the first web along the axial direction of the precast concrete beam. The first upper flange and the first lower flange of the embedded part are connected to the longitudinal reinforcement in the beam by lap welding. First stirrups that surround the first steel connector are evenly arranged on the embedded part. A first hole and / or a welded stud are provided on the first web of the embedded part; and a first bolt hole is provided on the first web of the exposed part. The second steel connection head is arranged on the side of the column body of the precast concrete column, part of which is embedded in the column and part of which is exposed. The second steel connection head includes an I-shaped steel, an anchor plate and a plurality of anchor bars. The I-shaped steel is located outside the column, the anchor plate is located inside the column, the first anchor bar is located partially inside the column and partially outside the column and is connected to the second upper flange and the second lower flange of the I-shaped steel by lap welding, the second anchor bar is located inside the column and welded to the anchor plate; the second upper flange and the second lower flange are welded to the first upper flange and the first lower flange respectively, a second bolt hole matching the first bolt hole is opened on the second web of the I-shaped steel, the connection between the first web and the second web is achieved by bolts, the bolts connecting the first web and the second web meet the requirements of high-strength bolt friction type connection, the size of the second upper flange and the second lower flange along the axial direction of the precast concrete beam is smaller than the size of the second web along the axial direction of the precast concrete beam, and second stirrups surrounding the first web and the second web are evenly arranged in the connection area between the first web and the second web.

4. The connection structure according to claim 3, characterized in that: The first web is a whole plane plate or is composed of two independent plane plates, and the two independent plane plates respectively form a T-shaped steel with the first upper flange and the first lower flange; the structure of the second web is consistent with that of the first web.

5. The connection structure according to claim 3, characterized in that: One end of the second web and one end of the second anchor bar are both butt-welded to the anchor plate in a T-shaped manner.

6. The connection structure according to claim 3, characterized in that: The first anchor bar and the second anchor bar should be arranged away from the longitudinal reinforcement in the column.

7. The connection structure according to claim 3, characterized in that: When the first anchor bar is overlap-welded with the second upper flange and the second lower flange by single-sided weld or double-sided weld, the overlap lengths are not less than 10 times and 5 times the diameter of the first anchor bar, respectively.

8. The connection structure according to claim 3, characterized in that: The distance from the center of the second anchor bar to the edge of the anchor plate should not be less than the larger value of 2 times the diameter of the second anchor bar and 20 mm.

9. The connection structure according to claim 3, characterized in that: The first anchor bar embedded in the second steel connection head of the precast concrete side column is bent and anchored in the column body.

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