Prefabricated beam-column-slab connection node and construction method thereof

Abstract

The present disclosure provides a prefabricated beam-column-slab connection node, including at least one floor slab, with no reinforcement around the floor slab, and a plurality of notches spaced along at least part of the edge of the floor slab; at least two composite columns; at least one composite beam; and a connector, including a first connector, a second connector, and a third connector, the first connector being used for lap connection between composite columns, the second connector being used for connection between composite beams and floor slabs, and the third connector being used for connection between composite beams and composite columns; concrete is poured at least in the cavity of the composite column, the cavity surrounded by the U-shaped beam shell of the composite beam, at least a portion of the floor slab, and the joint surrounded by the composite column and the composite beam, and the composite column, the composite beam, and the floor slab are connected by the connector and the poured concrete. The present disclosure also provides a construction method for a prefabricated beam-column-slab connection node. The present disclosure can realize rapid hoisting and connection, and the overall performance of the node is excellent.

Description

Technical Field

[0001] The present invention relates to the field of prefabricated buildings, and in particular to a prefabricated beam-column-slab connection node and a construction method thereof. Background Art

[0002] Prefabricated concrete structures can effectively save resources and energy, improve the efficiency of materials in building energy conservation and structural performance, reduce construction waste and adverse impacts on the environment, and meet the requirements of building industrialization, housing industrialization and green buildings. Among prefabricated structures, prefabricated concrete frame structures can be applied to large-space buildings such as office buildings, schools, and hospitals, and are the most widely used structural form in construction projects.

[0003] At present, the frame structure system based on solid prefabricated columns has many problems and difficulties. The heavy weight of solid column components leads to large tower cranes, which makes on-site hoisting and transportation difficult. Most of the longitudinal reinforcement of the columns is connected by semi-grouting sleeves on site, which makes it difficult to connect the reinforcement, the connection process is not visible, and the connection quality is difficult to guarantee. Many factors currently lead to low efficiency of prefabricated buildings, long construction period, increased costs and difficult to guarantee quality.

[0004] The invention patent application document named “Frame Structure System” and application number 2018107382429 discloses the use of mechanical connection at the connection nodes of hollow composite columns. The connection process of this connection form is visible and the connection quality is controllable, but it has high requirements on the precision of prefabricated components and the on-site steel bars cannot be accurately positioned, resulting in low frame production efficiency and on-site connection efficiency. Summary of the invention

[0005] After years of prefabricated building design, production and research and development, we have accumulated rich experience. Based on the composite concrete column and composite frame structure system, we have developed a new type of prefabricated beam-column-slab connection node. The center of the prefabricated part of the composite concrete column is a cavity, which is light in weight and convenient for transportation and on-site hoisting. The upper and lower ends of the prefabricated column do not have reinforcement, which can simplify the component production mold, improve the component production efficiency, and reduce the component production cost. The composite beam adopts U-shaped prefabricated components. The U-shaped prefabricated components are light in weight and can be used for large-span frames without being restricted by the tonnage of the tower crane. The ends of the prefabricated components do not have reinforcement, which is convenient for production. The floor slab can be a fully prefabricated floor slab or a composite floor slab. The prefabricated part does not have reinforcement. Notches are set to place the connecting steel bars. The components do not have reinforcement, which is convenient for production and easy for on-site installation of components. The lap connection node can realize the rapid connection of the longitudinal reinforcement after the composite column is hoisted in place on site, without the longitudinal reinforcement connector, the quality of the reinforcement connection is easy to control, and the connection performance is excellent, which solves the main technical defects of the current prefabricated solid prefabricated frame columns.

[0006] In order to solve at least one of the above technical problems, the present disclosure provides a prefabricated beam-column-slab connection node and a construction method thereof.

[0007] According to one aspect of the present disclosure, a prefabricated beam-column-slab connection node comprises: at least one floor slab, no reinforcement is provided around the periphery of the floor slab, and a plurality of notches are provided at intervals along at least part of the edge of the floor slab; at least two composite columns, each of which comprises a column shell, a cavity surrounded by the column shell, and a column reinforcement cage, wherein the column reinforcement cage is at least partially buried in the column shell; at least one composite beam, wherein the composite beam comprises a U-shaped beam shell and a beam reinforcement cage, wherein the beam reinforcement cage is at least partially buried in the U-shaped beam shell, and no reinforcement is provided at both ends of the composite beam; and a connection The connector comprises a first connector, a second connector and a third connector, wherein the first connector is used for overlapping connection between the composite columns, the second connector is used for connection between the composite beam and the floor slab, and the third connector is used for connection between the composite beam and the composite column; concrete is poured at least in the cavity of the composite column, the cavity surrounded by the U-shaped beam shell of the composite beam, at least a part of the floor slab and the joint surrounded by the composite column and the composite beam, and the composite column, the composite beam and the floor slab are connected through the connector and the poured concrete.

[0008] According to at least one embodiment of the present disclosure, the two composite columns are arranged in a vertical direction, one end of the first connector is arranged in the cavity of one composite column, and the other end of the first connector passes through the joint formed by the composite column and the composite beam and extends to the cavity of the other composite column.

[0009] According to at least one embodiment of the present disclosure, adjacent ends of two composite columns have no reinforcement, and the first connector is a lapped reinforcement cage.

[0010] According to at least one embodiment of the present disclosure, a plurality of notches are arranged at intervals along at least a portion of the edge of the floor slab, one end of the second connector is arranged in the notch, and the other end of the second connector extends into the composite beam by a predetermined length.

[0011] According to at least one embodiment of the present disclosure, the beam reinforcement cage includes a plurality of beam stirrup meshes spaced apart along the length direction of the composite beam and beam longitudinal bars connected to the plurality of beam stirrup meshes; the beam longitudinal bars include a first beam longitudinal bar buried in the U-shaped beam shell, and a second beam longitudinal bar arranged at the bottom of the U-shaped beam shell cavity and at the top of the beam stirrup mesh, and the second beam longitudinal bar extends into the composite column by a predetermined length or passes through the joint surrounded by the composite column and the composite beam, and the third connector is a second beam longitudinal bar.

[0012] According to at least one embodiment of the present disclosure, the groove extends from one end surface of the column shell along the length direction of the column shell to a first preset position of the column shell or the other end surface of the column shell.

[0013] According to at least one embodiment of the present disclosure, when both ends of the column longitudinal ribs do not extend out of the column shell, a groove is circumferentially arranged on the inner surface of at least one end of the column shell, and the groove extends from the end face of the column shell along the length direction of the column shell to a second preset position of the column shell.

[0014] According to at least one embodiment of the present disclosure, the cross-sectional shape of the stacked column cavity includes one or more of a rectangle, a circle, a polygon, a rectangle with a concave-convex shape, a circle with a concave-convex shape, or a polygon with a concave-convex shape.

[0015] According to at least one embodiment of the present disclosure, the cross-sectional shape of the column shell of the composite column is one of rectangular, circular or polygonal.

[0016] According to another aspect of the present disclosure, there is provided a construction method for the above-mentioned prefabricated beam-column-slab connection node, which includes installing composite columns; installing supports for composite beams and floor slabs; sequentially installing composite beams and floor slabs on the supports; installing composite column lap steel cages; installing upper and lower longitudinal steel bars of U-shaped beams; installing floor slab steel bars and partially setting up formwork; pouring concrete into the cavity of the composite column, the cavity surrounded by the U-shaped beam shell of the composite beam, at least a portion of the floor slab, and the joint surrounded by the composite column and the composite beam.

[0017] According to at least one embodiment of the present disclosure, the steps of installing composite columns, composite beams and floor slabs and pouring concrete are repeated once to construct the upper floor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings illustrate exemplary embodiments of the present disclosure and together with the description serve to explain the principles of the present disclosure. These drawings are included to provide a further understanding of the present disclosure and are incorporated in and constitute a part of this specification.

[0019] Figure 1 It is a schematic front cross-sectional view of a prefabricated part of a composite column according to an embodiment of the present disclosure.

[0020] Figure 2 It is a schematic top view of the structure of the prefabricated part of the composite column according to the embodiment of the present disclosure.

[0021] Figure 3 is a three-dimensional schematic diagram of a U-shaped beam structure according to the present disclosure.

[0022] Figure 4 It is a three-dimensional schematic diagram of a floor structure according to the present disclosure.

[0023] Figure 5 It is a schematic diagram of a hoisting composite column according to the present disclosure.

[0024] Figure 6It is a schematic diagram of installing composite beams and floor slab supports according to the present disclosure.

[0025] Figure 7 is a schematic diagram of installing a composite beam according to the present disclosure.

[0026] Figure 8 is a schematic diagram of installing a floor slab according to the present disclosure.

[0027] Fig. 9 It is a schematic diagram of installing a composite column overlap reinforcement cage according to the present disclosure.

[0028] Fig.10 It is a schematic diagram of installing the longitudinal reinforcement of the second beam of the composite beam according to the present disclosure.

[0029] Fig.11 It is a schematic diagram of installing floor slab connection steel bars and local formwork according to the present disclosure.

[0030] Fig.12 is a schematic diagram of pouring concrete according to the present disclosure.

[0031] Fig.13 It is a schematic diagram of installing an upper column according to the present disclosure.

[0032] Fig.14 is a schematic diagram of a floor support according to the present disclosure.

[0033] Figure numerals: 1—column shell; 2—column cavity; 3—column stirrup mesh; 4—column longitudinal reinforcement; 5—U-shaped beam shell; 6—composite beam; 61—first beam longitudinal reinforcement; 62—second beam longitudinal reinforcement; 7—beam stirrup mesh; 8—floor slab; 9—notch; 10—connecting steel bars; 11—lap steel cage; 12—support. DETAILED DESCRIPTION

[0034] The present disclosure is further described in detail below in conjunction with the accompanying drawings and implementations. It is understood that the specific implementations described herein are only used to explain the relevant content, rather than to limit the present disclosure. It should also be noted that, for ease of description, only the parts related to the present disclosure are shown in the accompanying drawings.

[0035] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in the present disclosure may be combined with each other. The present disclosure will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0036] The new type of prefabricated beam-column-slab connection node has a hollow center in the prefabricated part of the composite concrete column, which is light in weight and convenient for transportation and on-site hoisting. The upper and lower ends of the prefabricated column do not have reinforcement, which can simplify the component production mold, improve the component production efficiency, and reduce the component production cost. The composite beam adopts U-shaped prefabricated components. The U-shaped prefabricated components are light in weight and can be used for large-span frames without being restricted by the tonnage of the tower crane. The ends of the prefabricated components do not have reinforcement, which is convenient for production. The floor slab can be a fully prefabricated floor slab or a composite floor slab. The prefabricated part does not have reinforcement. Notches are set to place the connecting steel bars. The components do not have reinforcement, which is convenient for production and on-site installation of components. The lap connection node can realize the rapid connection of the longitudinal reinforcement after the composite column is hoisted into place on site, without the longitudinal reinforcement connector, and the quality of the steel bar connection is easy to control. The connection performance is excellent, which solves the main technical defects of the current assembled solid prefabricated frame columns.

[0037] According to a first embodiment of the present disclosure, a prefabricated beam-column-slab connection node is provided, comprising: at least one floor slab, wherein no reinforcement is provided around the periphery of the floor slab, and a plurality of notches are arranged at intervals along at least a portion of the edge of the floor slab; at least two composite columns, each of which comprises a column shell, a cavity surrounded by the column shell, and a column reinforcement cage, wherein the column reinforcement cage is at least partially buried in the column shell; at least one composite beam, wherein the composite beam comprises a U-shaped beam shell and a beam reinforcement cage, wherein the beam reinforcement cage is at least partially buried in the U-shaped beam shell, and no reinforcement is provided at both ends of the composite beam; and a connector, comprising a first connector, a second connector, and a third connector, wherein the first connector is used for lap connection between composite columns, the second connector is used for connection between the composite beam and the floor slab, and the third connector is used for connection between the composite beam and the composite column; concrete is poured at least in the cavity of the composite column, the cavity surrounded by the U-shaped beam shell of the composite beam, at least a portion of the floor slab, and a joint surrounded by the composite column and the composite beam, and the composite column, the composite beam, and the floor slab are connected through the connector and the poured concrete. The ends of the composite columns, composite beams and floor slabs are not reinforced, which will not cause mutual interference between prefabricated components during the construction process, making it easier to produce. In addition, the upper and lower ends of the composite columns are not reinforced, which can simplify the component production mold, improve the component production efficiency, and reduce the component production cost. Optionally, both ends of the column reinforcement cage of the composite column do not extend outside the column shell. The connection between the lower composite column and the upper composite column avoids the use of semi-grouting sleeves, straight thread sleeves and other methods for mechanical connection of steel bars. The overlap connection is adopted through the connector, which can quickly realize the rapid lifting and connection of the composite concrete column. The on-site construction is convenient and efficient, and the overall performance of the node is excellent. In addition, the connection between the composite beam and the composite column is also anchored to the composite column through the connector. The ends of the composite beam are not reinforced, the component production cost is low, the production efficiency is high, and the on-site installation is convenient. At the same time, the U-shaped beam shell can provide a larger operating surface for the placement of steel bars on the construction site, which is convenient for steel bar installation. The ends of the prefabricated floor slabs are not reinforced, which avoids the collision of hoisting steel bars, facilitates on-site installation, and improves the component production efficiency. Optionally, a fully prefabricated floor is used to avoid the construction progress being affected by the hardening strength of concrete, thereby improving the progress of on-site construction. The fully prefabricated floor does not need to wait for the cast-in-place concrete to reach the strength before the subsequent installation and construction can be continued, which greatly speeds up the process. Optionally, the prefabricated floor adopts a composite floor, and no reinforcement is provided at each end of the prefabricated part. Due to the light weight of the component, it is convenient for transportation and on-site hoisting. The composite beam adopts a U-shaped beam shell prefabricated component, which is light in weight and can be used for large-span frames without being restricted by the tonnage of the tower crane. In addition, no reinforcement is provided at the end of the prefabricated component, which is convenient for production. A part of the longitudinal reinforcement of the beam reinforcement cage (for example, the first beam longitudinal reinforcement) is buried in the U-shaped beam shell, and another part of the longitudinal reinforcement (for example, the second beam longitudinal reinforcement) passes through the joint of the composite beam and the composite column before on-site casting to become part of the connector.After the composite beams, composite columns, floor slabs and connectors are all installed in place, concrete is poured in the cavities of the composite columns, the cavities surrounded by the U-shaped beam shells of the composite beams, the joints surrounded by the composite columns and the composite beams, and a part of the prefabricated floor slabs to form prefabricated beam-column-slab connection nodes.

[0038] Optionally, two composite columns are arranged in a vertical direction, one end of the first connector is arranged in the cavity of one composite column, and the other end of the first connector passes through the joint surrounded by the composite column and the composite beam and extends to the cavity of the other composite column. When the column reinforcement cages at both ends of two adjacent composite columns do not extend out of the column shell, the connector is a lap reinforcement cage, which is arranged in the cavity of one composite column, and the other end of the lap reinforcement cage passes through the joint surrounded by the composite column and the composite beam and extends to the other composite column. Since there are no reinforcement bars at both ends of the column reinforcement cage, the first connector is formed by installing the lap reinforcement cage on site. For example, one end of the lap reinforcement cage is placed in the cavity of the lower composite column, and the other end of the lap reinforcement cage passes through the joint surrounded by the composite column and the composite beam and extends to the cavity of the other composite column to form a lap connection.

[0039] Optionally, a plurality of notches are provided at intervals along at least part of the edge of the floor slab, and the notches are used to place the second connector, for example, the second connector is a connecting steel bar. For example, the floor slab is rectangular, and a plurality of notches are provided at intervals on the four sides of the floor slab according to actual needs, and the direction of the notches is perpendicular to the sides where they are located, and the size of the notches should be convenient for placing the second connector (such as connecting steel bars, etc.) and meet the requirements of the lap length of the second connector, one section of the connecting steel bar is placed in the notch, and the other section of the connecting steel bar is overlapped in the beam steel cage of the composite beam. Optionally, notches are provided at intervals on a part of the edge of the floor slab, and the provision of the connecting steel bars and notches avoids the protrusion of steel bars at the edge of the floor slab, and the production mold is simplified, which is convenient for production and on-site installation of the floor slab.

[0040] Wherein, the column reinforcement cage includes a plurality of column stirrup meshes and column longitudinal reinforcements fixedly connected to the plurality of column stirrup meshes, and the plurality of column stirrup meshes are arranged at intervals along the length direction of the composite column; at least one end of the column longitudinal reinforcement does not extend out of the column shell. The plurality of column stirrup meshes are fixedly connected to the column longitudinal reinforcements, such as binding connection, welding connection, etc. The circumferential reinforcements of the column stirrup meshes are buried in the column shell, and both ends of the column longitudinal reinforcement do not extend out of the end surface of the column shell. The column longitudinal reinforcements are all buried in the column shell or part of the column longitudinal reinforcements are buried in the column shell, and the other part is located in the cavity surrounded by the column shell. The absence of reinforcements at both ends of the column longitudinal reinforcements can simplify the component production mold, improve the component production efficiency, and reduce the component production cost.

[0041] The beam reinforcement cage includes a plurality of beam stirrup meshes and beam longitudinal bars fixedly connected to the plurality of beam stirrup meshes, wherein the plurality of beam stirrup meshes are arranged at intervals along the length direction of the composite beam; the plurality of beam stirrup meshes are fixedly connected to the beam longitudinal bars, such as binding connection, welding connection, etc., a part of the beam stirrup mesh is buried in the U-shaped beam shell, and the other part extends out of the open end of the U-shaped beam shell to form a part of the connector. The beam longitudinal bars are divided into two parts, including a first beam longitudinal bar buried in the U-shaped beam shell, and a second beam longitudinal bar, wherein the second beam longitudinal bar is arranged at the bottom of the U-shaped beam shell cavity and the top of the beam stirrup mesh, and the second beam longitudinal bar runs through the joint surrounded by the composite column and the composite beam, and the third connector can be the second beam longitudinal bar. The first beam longitudinal bar is completely buried in the U-shaped beam shell, i.e., the prefabricated part of the composite beam, and the first beam longitudinal bar does not extend from both ends of the U-shaped beam shell, which is convenient for production and installation. The second beam longitudinal reinforcement is not prefabricated in the composite beam, but is installed before on-site casting to ensure mutual interference of the steel bars during the lifting process of the composite beam. For example, a part of the second beam longitudinal reinforcement is placed at the bottom of the U-shaped beam shell cavity, and the other part of the second beam longitudinal reinforcement passes through the beam stirrup mesh and extends out of the top of the open end of the U-shaped beam shell and is fixedly connected to the beam stirrup mesh, for example, by binding connection, welding connection, etc. One end of the second beam longitudinal reinforcement passes through the joint surrounded by the composite column and the composite beam to become a part of the connector, which is used for the connection between the composite beam and the composite column, and between the composite beams. Optionally, the beam reinforcement cage also includes beam waist reinforcement and beam tension reinforcement, wherein the beam waist reinforcement and beam tension reinforcement are provided according to the specific situation or may not be provided.

[0042] Optionally, a plurality of grooves are arranged at intervals along the circumferential direction on the inner surface of the column shell located on one side of the cavity. For example, the groove extends from one end face of the column shell along the length direction of the column shell to the first preset position of the column shell. The groove is located at one or both ends of the column shell but does not penetrate the entire length of the column shell. A connector, such as a connecting steel bar, can be placed in the groove portion. The upper and lower prefabricated composite columns are overlapped by placing connecting steel bars in the cavity. The concave and convex form of the inner cavity of the prefabricated composite column reduces the distance between the overlapping steel bars and does not cause the weakening of the component cross section. The on-site steel bar construction and positioning are simple, the connection process is visible, and the quality is easy to control and detect, thereby ensuring the effective transmission of the internal force of the composite column. Optionally, the groove extends from one end face of the column shell along the length direction of the column shell to the other end face of the column shell, and the groove penetrates the column shell within the entire length of the column shell. The concave and convex inner cavity boundary of the end of the prefabricated composite column increases the interface area of ​​the new and old concrete, which can form a good bite between the concrete poured on site and the prefabricated components. The composite components have strong integrity. The prefabricated composite column can effectively reduce the weight of the prefabricated components and facilitate on-site lifting. The component performance is better than that of traditional solid prefabricated columns.

[0043] Optionally, both ends of the column longitudinal ribs do not extend out of the column shell, and a groove is provided on the inner surface of one end of the column shell along the circumferential direction. For example, the wall thickness of the end of the column shell is less than the wall thickness of the middle part, that is, the cavity is a variable cross-section cavity, and the thickness of the column shell can vary along the length direction of the column. Optionally, grooves are provided on the inner surfaces of both ends of the column shell along the circumferential direction. The grooves extend from the end face of the column shell along the length direction of the column shell to a second preset position of the column shell (for example, the middle position of the column shell). The grooves are used to place the connector, the improved composite column at the column end, the middle section of the column can be simplified or template-free, the template of the end section is easy to disassemble and assemble, the production cost of the component is reduced, and the production efficiency is improved.

[0044] Optionally, the cross-sectional shape of the laminated column cavity includes, but is not limited to, one or more of a rectangle, a circle, a polygon, a rectangle with concave-convex shapes, a circle with concave-convex shapes, or a polygon with concave-convex shapes.

[0045] Optionally, the cross-sectional shape of the column shell of the composite column is one of rectangular, circular or polygonal.

[0046] According to another embodiment of the present disclosure, a construction method for a prefabricated beam-column-slab connection node is provided, comprising: installing a composite column; installing a composite beam and a support for a floor slab; sequentially installing the composite beam and the floor slab on the support; installing a connector, and locally setting a formwork; pouring concrete into the cavity of the composite column, the cavity surrounded by the U-shaped beam shell of the composite beam, at least a portion of the floor slab, and the joint surrounded by the composite column and the composite beam. Optionally, the floor slab is a fully prefabricated floor slab, and the notches on the floor slab need to be poured. Optionally, the floor slab is a composite floor slab, and the notches on the floor slab and the cavity or the portion to be poured of the floor slab need to be poured. Optionally, in addition to using a vertical support at the bottom of the slab, the floor slab support may not be provided at the bottom of the slab during construction, and a support member that can be adjusted to support the floor slab is provided on the side of the beam, for example, the support member is an angle steel, and the angle steel and the like are directly provided on the support, such as a wall or a composite beam, to support the floor slab, thereby eliminating the need for installing vertical supports and improving construction efficiency.

[0047] Optionally, installing the connector includes installing a lap steel cage into the composite column; installing the longitudinal reinforcement of the second beam of the composite beam and the connecting reinforcement of the floor slab groove, etc.

[0048] Optionally, before pouring concrete, local formwork is required at the junction of the composite beam and the composite column.

[0049] Optionally, after pouring concrete, the construction of this layer is completed after the concrete reaches a certain strength, and the above installation sequence is repeated to construct the upper prefabricated components.

[0050] The prefabricated beam-column-slab connection node and construction method thereof provided by the present invention:

[0051] 1) The overlapped connection of the composite column avoids the use of semi-grouting sleeves, straight thread sleeves and other methods for mechanical connection of steel bars on site, and can quickly realize the rapid lifting and connection of the composite concrete column. The on-site construction is convenient and efficient, and the overall performance of the node is excellent;

[0052] 2) The longitudinal reinforcement of the upper and lower columns of the composite column is overlapped and connected. The longitudinal reinforcement connection process is visible, and the quality is easy to control and detect, ensuring the effective transmission of the composite column force.

[0053] 3) The upper and lower prefabricated hollow columns are connected by placing connecting steel bars in the cavity. The concave and convex form of the inner cavity of the prefabricated composite column reduces the distance between the overlapping steel bars and does not cause the weakening of the component cross section. The on-site steel bar construction and positioning are simple, the connection process is visible, and the quality is easy to control and detect, ensuring the effective transmission of the internal force of the composite column.

[0054] 4) The concave and convex boundary of the inner cavity at the end of the prefabricated composite column increases the interface area between the new and old concrete, which can form a good bite between the concrete poured on site and the prefabricated components. The composite components have strong integrity. The prefabricated hollow column can effectively reduce the weight of the prefabricated components and facilitate on-site lifting. The component performance is better than that of traditional solid prefabricated columns.

[0055] 5) The composite column with improved column ends can realize the simplification or formwork-free of the middle section of the column, and the formwork of the end section is easy to disassemble and assemble, which reduces the production cost of the components and improves the production efficiency.

[0056] 6) U-shaped composite beam reduces the weight of the component, facilitates hoisting, does not have reinforcement at the end of the component, has low component production cost, high production efficiency, and convenient on-site installation. The U-shaped beam shell can provide a larger operating surface for the placement of steel bars on the construction site, making it easier to install steel bars.

[0057] 7) The ends of prefabricated floor slabs are not reinforced to avoid collision of hoisting steel bars, facilitate on-site installation, and improve component production efficiency. The use of fully prefabricated floor slabs can avoid the construction progress being affected by the hardening strength of concrete and improve the on-site construction progress. Fully prefabricated floor slabs do not need to wait for the cast-in-place concrete to reach the strength before continuing the subsequent installation and construction, which greatly speeds up the process.

[0058] The above-mentioned prefabricated beam-column-slab connection node will be described in detail below in conjunction with specific embodiments.

[0059] The present invention provides a prefabricated beam-column-slab connection node, comprising: at least one floor slab, wherein no reinforcement is provided at the periphery of the floor slab, and a plurality of notches are arranged at intervals along at least a portion of the edge of the floor slab; at least two composite columns, each of which comprises a column shell, a cavity surrounded by the column shell, and a column reinforcement cage, wherein the column reinforcement cage is at least partially buried in the column shell; at least one composite beam, wherein the composite beam comprises a U-shaped beam shell and a beam reinforcement cage, wherein the beam reinforcement cage is at least partially buried in the U-shaped beam shell, and no reinforcement is provided at both ends of the composite beam; and a connector, comprising a first connector, a second connector, and a third connector, wherein the first connector is used for lap connection between composite columns, the second connector is used for connection between the composite beam and the floor slab, and the third connector is used for connection between the composite beam and the composite column; concrete is poured at least in the cavity of the composite column, the cavity surrounded by the U-shaped beam shell of the composite beam, at least a portion of the floor slab, and a joint surrounded by the composite column and the composite beam, and the composite column, the composite beam, and the floor slab are connected through the connector and the poured concrete. There are no reinforcement bars at both ends of the composite column. The above structure will be described below.

[0060] like Figures 10 to 13 As shown, the prefabricated beam-column-slab connection node may include: at least one floor slab 8, at least two composite columns and at least one composite beam and a connector, wherein Fig.10 This is a three-dimensional schematic diagram after the installation of the third connector (the longitudinal reinforcement of the second beam of the composite beam).

[0061] like Figure 1 a、1b、 Figure 2 a to 2d and Figure 5 As shown, the column reinforcement includes a plurality of column stirrup meshes 3 and column longitudinal bars 4. The plurality of column stirrup meshes 3 are arranged at intervals along the length direction of the composite column. The plurality of column stirrup meshes 3 and the column longitudinal bars 4 are fixedly connected, such as by binding connection, welding connection, etc. The circumferential reinforcement of the column stirrup meshes 3 is buried in the column shell 1, and both ends of the column longitudinal bars 4 do not extend out of the end surface of the column shell. The column longitudinal bars 4 are all buried in the column shell or part of the column longitudinal bars 4 is buried in the column shell 1, and the other part is located in the cavity 2 surrounded by the column shell. The above-mentioned column longitudinal bars do not protrude at both ends, which can simplify the component production mold, improve the component production efficiency, and reduce the component production cost.

[0062] like Figure 3 and Fig.10As shown, the composite beam includes a U-shaped beam shell 5 and a beam reinforcement cage. The beam reinforcement cage is at least partially buried in the U-shaped beam shell 5, and the two ends of the composite beam do not have reinforcement, which is convenient for lifting. The beam reinforcement cage includes a plurality of beam stirrup meshes 7 and beam longitudinal reinforcements fixedly connected to the plurality of beam stirrup meshes 7. The plurality of beam stirrup meshes 7 are arranged at intervals along the length direction of the composite beam; the plurality of beam stirrup meshes 7 are fixedly connected to the beam longitudinal reinforcements, such as binding connection, welding connection, etc., a part of the beam stirrup meshes 7 is buried in the U-shaped beam shell, and the other part extends out of the open end of the U-shaped beam shell to form a part of the connector. The beam longitudinal reinforcement includes a first beam longitudinal reinforcement 61 and a second beam longitudinal reinforcement 62 (a third connector), the first beam longitudinal reinforcement 61 is buried in the U-shaped beam shell and prefabricated, the second beam longitudinal reinforcement 62 is arranged at the bottom of the cavity of the U-shaped beam shell 5 and the top of the beam stirrup mesh 7, and the second beam longitudinal reinforcement 62 passes through or is anchored (after pouring concrete) in the joint surrounded by the composite column and the composite beam. The first beam longitudinal reinforcement 61 does not extend from both ends of the U-shaped beam shell 5, which is convenient for production and installation. The second beam longitudinal reinforcement 62 is not prefabricated in the composite beam, but is installed before on-site pouring to ensure mutual interference of the steel bars during the composite beam hoisting process. For example, a part of the second beam longitudinal reinforcement 62 is placed at the bottom of the U-shaped beam shell cavity, and the other part of the second beam longitudinal reinforcement 62 passes through the beam stirrup mesh 7 and extends out of the top of the open end of the U-shaped beam shell 5 and is fixedly connected with the beam stirrup mesh 7, for example, by binding connection, welding connection, etc. One end of the second beam longitudinal reinforcement 62 passes through or is anchored (after concrete is poured) in the joint surrounded by the composite column and the composite beam to become a part of the connector, which is used for lap connection between the composite beam and the composite column, and between the composite beams. Optionally, the beam reinforcement cage also includes beam waist reinforcement and beam tension reinforcement, wherein the beam waist reinforcement and beam tension reinforcement are provided according to the specific situation, or they may not be provided.

[0063] like Figure 4 As shown, the floor slab 8 is a fully prefabricated floor slab, and there are no reinforcements around the floor slab 8, for example, no reinforcements are provided at the ends, so that no mutual interference between prefabricated components will occur during the construction process, thereby making it easier to produce. A plurality of notches 9 are arranged at intervals along the edge of the floor slab, and the notches 9 are used to place the connectors. The direction of the notches 9 is perpendicular to the edge where they are located, and the size of the notches 9 should be convenient for placing the connectors and meet the requirements of the connector overlap length. At this time, the connector in the notch 9 is a connecting steel bar 10, and one section of the connecting steel bar 10 is placed in the notch 9, and the other section of the connecting steel bar 10 is overlapped in the beam reinforcement cage of the composite beam. The setting of the connecting steel bars and notches avoids the protrusion of reinforcements at the edge of the floor slab, and the production mold is simplified, which is convenient for production.

[0064] like Fig.12 As shown, concrete is poured into the cavity 2 of the composite column, the cavity enclosed by the U-shaped beam shell 5 of the composite beam, the joint enclosed by the composite column and the composite beam, and the notch 9 of the floor slab 8 to form a prefabricated beam-column-slab connection node. Fig.12 Schematic diagram of pouring concrete.

[0065] like Fig. 9 As shown, when both ends of the column longitudinal reinforcement 4 do not extend out of the column shell 1, the first connector is a lap steel cage 11, which is arranged in the cavity 2 of the composite column during the installation of the connector, and one end of the lap steel cage 11 passes through the joint formed by the composite column and the composite beam and extends to the cavity of another composite column. For example, one end of the lap steel cage 11 is placed in the cavity 2 of the lower composite column, the other end of the lap steel cage 11 extends to the joint formed by the composite column and the composite beam, and a part of the lap steel cage 11 further extends to the cavity 2 of the upper composite column to form a connector, forming a lap connection between the upper composite column and the lower composite column.

[0066] like Figure 1 b and Figure 2 As shown in 2b and 2d, a plurality of grooves are arranged at intervals along the circumferential direction on the inner surface of the column shell 1 located on one side of the cavity, forming a concave-convex structure on the inner surface of the column shell 1. The groove is located at the end of the column shell 1, and extends from one end face of the column shell 1 along the length direction of the column shell to a certain position of the column shell without penetrating the entire length of the column shell. A connector, such as a connecting steel bar, can be placed in the groove portion, and the upper and lower prefabricated composite columns are overlapped by placing connecting steel bars in the cavity. The concave-convex form of the inner cavity 2 of the composite column reduces the distance between the overlapping steel bars, does not cause the weakening of the component cross section, and simplifies the on-site steel bar construction and positioning. The groove extends from one end face of the column shell 1 along the length direction of the column shell to the other end face of the column shell 1, and the groove penetrates the entire column shell 1 within the entire length range of the column shell 1.

[0067] The end of the column shell 1 can also be provided with a groove along the circumferential direction on the inner surface, and the groove extends from the end face of the column shell 1 along the length direction of the column shell 1 to the second preset position of the column shell (for example, the middle position of the column shell). The wall thickness of the end of the column shell 1 is less than the wall thickness of the middle part, that is, the thickness of the column shell 1 can change along the length direction of the column. Optionally, the ends of both ends of the column shell 1 are respectively provided with the above grooves, and the grooves are used to place the connector, the improved composite column at the column end, and the middle section of the column can be simplified or template-free.

[0068] like Figure 2 The top view schematic diagrams of the composite column shown in a to 2d, the cross-sectional shape of the composite column cavity 2 includes but is not limited to one or more of a rectangle, a circle, a polygon, a rectangle with a concave-convex shape, a circle with a concave-convex shape, or a polygon with a concave-convex shape. Optionally, the cross-sectional shape of the column shell 1 of the composite column is one of a rectangle, a circle, or a polygon.

[0069] This embodiment also provides a construction method for prefabricated beam-column-slab connection nodes, such as Figures 5 to 13 As shown, including: installing a composite column (such as Figure 5 Installation of composite beams and floor supports 12 (as shown); Figure 6Install the composite beams and floor slabs to the support 12 in sequence (as shown); Figures 7 to 8 As shown); Install the connector (as shown Figure 8 The installation shown in the figure is to connect the steel cage 11 to the composite column, as shown in the figure. Figures 9 to 11 The second longitudinal reinforcement 62 of the composite beam and the connecting reinforcement 10 of the floor notch 9 are installed as shown; concrete is poured into the cavity 2 of the composite column, the cavity surrounded by the U-shaped beam shell 5 of the composite beam, at least a part of the floor 8, and the joint surrounded by the composite column and the composite beam. Optionally, the floor is a fully prefabricated floor, and the notch 9 on the floor needs to be poured. Also optionally, the floor is a composite floor, and the notch 9 on the floor and the cavity or the part to be poured on the floor need to be poured. Among them, as Fig.14 As shown, the step of installing the support 12 of the composite beam and the floor slab can be that the support of the floor slab 8 does not use vertical support, and the support 12 can be directly set on the side of the composite beam 6, for example, the floor slab is supported by angle steel, the upper end face of the angle steel supports the floor slab 8, and the other end face of the angle steel is fixedly connected to the side of the composite beam 6 by bolts, thereby eliminating the installation of vertical support and improving construction efficiency.

[0070] After the concrete reaches a certain strength, the construction of this layer is completed, and the above installation sequence is repeated to construct the upper prefabricated components.

[0071] In the description of this specification, the description with reference to the terms "one embodiment / method", "some embodiments / methods", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment / method or example are included in at least one embodiment / method or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment / method or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments / methods or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments / methods or examples described in this specification and the features of the different embodiments / methods or examples, unless they are contradictory.

[0072] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0073] Those skilled in the art should understand that the above embodiments are only for the purpose of clearly illustrating the present disclosure, and are not intended to limit the scope of the present disclosure. For those skilled in the art, other changes or modifications may be made based on the above disclosure, and these changes or modifications are still within the scope of the present disclosure.

Claims

1. A prefabricated beam-column-slab connection node, characterized in that: include: At least one floor slab, wherein no reinforcement is provided around the periphery of the floor slab, and a plurality of notches are provided at intervals along at least a portion of the edge of the floor slab; At least two composite columns, each composite column comprising a column shell, a cavity surrounded by the column shell, and a column reinforcement cage, wherein the column reinforcement cage is at least partially buried in the column shell; At least one composite beam, the composite beam comprising a U-shaped beam shell and a beam reinforcement cage, the beam reinforcement cage is at least partially buried in the U-shaped beam shell, and no reinforcement is provided at both ends of the composite beam; as well as A connector, comprising a first connector, a second connector and a third connector, wherein the first connector is used for overlapping the composite columns, the second connector is used for connecting the composite beam to the floor slab, and the third connector is used for connecting the composite beam to the composite column; Concrete is poured at least in the cavity of the composite column, the cavity surrounded by the U-shaped beam shell of the composite beam, at least a part of the floor slab, and the joint surrounded by the composite column and the composite beam, and the composite column, the composite beam and the floor slab are connected by the connector and the poured concrete; The two composite columns are arranged in a vertical direction, one end of the first connector is arranged in the cavity of one composite column, and the other end of the first connector passes through the joint formed by the composite column and the composite beam and extends to the cavity of the other composite column; The beam reinforcement cage comprises a plurality of beam stirrup meshes spaced apart along the length direction of the composite beam and beam longitudinal bars connected to the plurality of beam stirrup meshes; The beam longitudinal reinforcement includes a first beam longitudinal reinforcement embedded in the U-shaped beam shell, and a second beam longitudinal reinforcement arranged at the bottom of the U-shaped beam shell cavity and the top of the beam stirrup mesh, and the second beam longitudinal reinforcement extends into the composite column by a predetermined length or passes through the joint surrounded by the composite column and the composite beam, and the third connector is the second beam longitudinal reinforcement.

2. The prefabricated beam-column-slab connection node according to claim 1, characterized in that: There are no reinforcement bars at the adjacent ends of the two composite columns, and the first connector is a lapped steel cage.

3. The prefabricated beam-column-slab connection node according to claim 1, characterized in that: One end of the second connector is disposed in the notch, and the other end of the second connector extends into the composite beam by a predetermined length.

4. The prefabricated beam-column-slab connection node according to claim 1, characterized in that: A plurality of grooves are arranged at intervals along the circumferential direction on the inner surface of the column shell, and the grooves extend from one end surface of the column shell along the length direction of the column shell to a first preset position of the column shell or the other end surface of the column shell.

5. The prefabricated beam-column-slab connection node according to claim 1, characterized in that: When both ends of the column reinforcement cage do not extend out of the column shell, a groove is circumferentially arranged on the inner surface of at least one end of the column shell, and the groove extends from the end surface of the column shell along the length direction of the column shell to a second preset position of the column shell.

6. The prefabricated beam-column-slab connection node according to claim 1, characterized in that: The cross-sectional shape of the stacked column cavity includes a circular shape or a polygonal shape.

7. The prefabricated beam-column-slab connection node according to claim 6, characterized in that: The cross-sectional shape of the column shell of the composite column is circular or polygonal.

8. The construction method of the prefabricated beam-column-slab connection node according to any one of claims 1 to 7, characterized in that: Install composite columns; Install U-beams and floor slab supports; Install the composite beams and floor slabs onto the supports in sequence; Install composite column lap reinforcement cage; Install the longitudinal reinforcements at the upper and lower parts of the U-shaped beam; Install floor slab reinforcement and set up formwork locally; Concrete is poured into the cavity of the composite column, the cavity surrounded by the U-shaped beam shell of the composite beam, at least a part of the floor slab, and the joint surrounded by the composite column and the composite beam.

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