An assembled precast hollow column shear connection structure and its construction method

Abstract

The present invention discloses an assembled prefabricated hollow column shear-resistant connection structure, comprising an upper prefabricated column and a lower prefabricated column that cooperate with each other, wherein the upper prefabricated column comprises an upper hollow column body and an upper steel cage embedded in the upper hollow column body, and the lower end of the upper hollow column body is also pre-embedded with a plurality of grouting sleeves; the lower prefabricated column comprises a lower hollow column body and a lower steel cage embedded in the lower hollow column body, the upper end of the lower steel cage extends from the upper surface of the lower hollow column body and can be inserted into the lower end of the corresponding grouting sleeve to connect the upper and lower prefabricated columns; the upper end of the lower prefabricated column is also provided with a steel rib shear-resistant member, the steel rib shear-resistant member comprises a steel sleeve and a spiral steel bar wrapped around the outer circumference of the steel sleeve. The connection structure of the present invention connects the longitudinal steel bars by pre-embedded grouting sleeves to transfer the axial stress of the steel bars, while also ensuring that the upper and lower prefabricated columns will not twist, and the addition of the steel rib shear-resistant member provides shear resistance.

Description

Technical Field

[0001] The present invention belongs to the technical field of assembled concrete buildings, and in particular relates to an assembled prefabricated hollow column shear-resistant connection structure and a construction method thereof. Background Art

[0002] Under the background of "dual carbon", there is a lot of room for carbon emission reduction in prefabricated buildings, so its application scope is constantly expanding, and local governments are also increasing support and subsidies. In addition, with the current wave of continuous industrialization in the construction industry, prefabricated buildings are unanimously praised and promoted by the industry and outside due to their factory assembly line production, high-quality components, and convenient on-site installation. The fundamental difference between prefabricated concrete structures and cast-in-place concrete structures is the connection method of component nodes. However, the existing prefabricated node forms generally have the problem of insufficient integrity. For this reason, ensuring the effectiveness of the connection between each prefabricated component is the key to solving the problem of the integrity of the prefabricated building structure. Therefore, it is particularly important to find a vertical component connection method that meets the force requirements of prefabricated vertical components and is simple to operate and low in cost.

[0003] In current practical projects, the vertical connection methods of prefabricated concrete structures mainly include mortise and tenon connection, grout-anchor connection, welded joint, bolted joint, sleeve grouting connection, etc. Among them, sleeve grouting connection is the most common vertical connection method of prefabricated concrete structures.

[0004] The sleeve grouting connection method for steel bars is a type of mechanical connection that is simple, efficient, and does not require welding. The sleeve grouting connection has the advantages of reducing the workload of steel bar pre-processing, preventing secondary stress and deformation of the steel bars during on-site construction, and being able to accept relatively large construction deviations. However, the sleeve grouting method currently commonly used in prefabricated buildings still has many limitations and shortcomings. For example, the quality of the grouting sleeve cannot be guaranteed, and the construction quality of the grouting sleeve cannot be easily inspected. It is worth mentioning that the use of grouting sleeve connections mainly transfers the axial stress of the steel bars, but has limited effect on the shear resistance of the column-to-column connection area.

[0005] In addition, prefabricated components themselves are another important factor in the development of prefabricated concrete structures, especially their cost. Cost control is a crucial aspect in promoting prefabricated buildings. Traditional prefabricated components, especially prefabricated columns, are heavy during production, transportation, construction, and installation, increasing the difficulty and cost of production, transportation, construction, and installation. Consequently, these components are not commonly used in practice.

[0006] In order to solve the above problems in actual engineering, it is of great significance to the development of prefabricated buildings to research, design and produce a prefabricated column component with small mass, convenient transportation, quick installation and wide application range, as well as a column-to-column connection form that is convenient for inspection of the connection parts after construction, has strong energy dissipation capacity during earthquakes and sufficient ductility. Summary of the Invention

[0007] In order to solve the above problems existing in the prior art, the present invention provides an assembled prefabricated hollow column shear-resistant connection structure and its construction method. The technical problem to be solved by the present invention is achieved through the following technical solutions:

[0008] The present invention provides an assembled prefabricated hollow column shear-resistant connection structure, comprising an upper prefabricated column and a lower prefabricated column that cooperate with each other, wherein:

[0009] The upper prefabricated column includes an upper hollow core column body and an upper steel cage embedded in the upper hollow core column body, and a plurality of grouting sleeves are pre-embedded at the lower end of the upper hollow core column body;

[0010] The lower prefabricated column includes a lower hollow core column body and a lower steel cage embedded in the lower hollow core column body, wherein the upper end of the lower steel cage extends from the upper surface of the lower hollow core column body and can be inserted into the lower end of the corresponding grouting sleeve to connect the upper prefabricated column and the lower prefabricated column;

[0011] The upper end of the lower prefabricated column is also provided with a steel rib shear member, and the steel rib shear member includes a steel sleeve and a spiral steel bar wrapped around the outer circumference of the steel sleeve. The lower end of the steel sleeve is cast inside the lower hollow core column body and is connected to the hollow inner cavity of the lower end of the lower hollow core column body. The upper end of the steel sleeve extends from the upper surface of the lower hollow core column body and can be inserted into the lower end of the hollow inner cavity of the upper hollow core column body of the upper prefabricated column.

[0012] In one embodiment of the present invention, the middle portion of the upper hollow core column body includes an axially arranged hollow inner cavity, the upper end of the hollow inner cavity is cylindrical, and the lower end is funnel-shaped.

[0013] In one embodiment of the present invention, the upper steel bar cage includes a plurality of upper longitudinal steel bars cast around the hollow inner cavity of the upper hollow core column body and upper spiral steel bars spirally wrapped around the outer periphery of the plurality of upper longitudinal steel bars, and the lower end of each upper longitudinal steel bar is connected to a grouting sleeve, the main part of the grouting sleeve is cast inside the upper hollow core column body, and the lower end opening of the grouting sleeve is located on the lower surface of the upper hollow core column body.

[0014] In one embodiment of the present invention, the steel sleeve includes a cylindrical section at the upper end and a truncated conical section at the lower end, wherein the upper end of the truncated conical section and the lower end of the cylindrical section have the same diameter and are connected to each other, and the diameter of the truncated conical section gradually increases from top to bottom; the spiral steel bars are evenly spaced around the outer circumference of the cylindrical section and the truncated conical section.

[0015] In one embodiment of the present invention, a plurality of anchoring steel bars are further provided on the steel rib shear member, one end of the plurality of anchoring steel bars is connected to the inner edge of the lower end of the truncated cone section at equal intervals, and the other ends extend longitudinally downward in parallel with each other.

[0016] In one embodiment of the present invention, the lower steel cage includes a plurality of lower longitudinal steel bars cast around the hollow inner cavity of the lower hollow core column body and lower spiral steel bars spirally wound around the outer periphery of the plurality of lower longitudinal steel bars.

[0017] In one embodiment of the present invention, the upper longitudinal steel bars and the lower longitudinal steel bars have the same number and casting position.

[0018] In one embodiment of the present invention, the upper hollow core column body and the lower hollow core column body are both formed by pouring concrete.

[0019] In one embodiment of the present invention, the upper prefabricated column and the lower prefabricated column have exactly the same structure, wherein:

[0020] In the lower precast column, a grouting sleeve is connected to the lower end of each lower longitudinal steel bar;

[0021] In the upper prefabricated column, a steel rib shear member is provided at the upper end of the upper hollow core column body. The steel rib shear member includes a steel sleeve and a spiral steel bar wound around the outer circumference of the steel sleeve.

[0022] Another aspect of the present invention provides a construction method for an assembled prefabricated hollow column shear-resistant connection structure, which is used to prepare the assembled prefabricated hollow column shear-resistant connection structure described in the above embodiment. The construction method comprises:

[0023] S1: Fabrication of a pre-embedded steel rib shear member: a cylindrical steel sleeve and a truncated cone steel sleeve are fabricated and welded together to form a whole, thereby forming a steel sleeve having a cylindrical section and a truncated cone section; spiral steel bars are welded to the outer circumference of the integral steel sleeve, and anchor steel bars are welded to the inner edge of the lower end of the truncated cone section, thereby forming the steel rib shear member;

[0024] Production of precast concrete hollow columns: Tie the steel cage, cast the precast hollow columns, embed the prefabricated steel rib shear members at the upper end of the hollow columns; embed the grouting sleeve at the lower end of the hollow columns, and make the lower end of the hollow inner cavity of the hollow columns into a funnel shape;

[0025] Use a sling to hook the reserved points of the concrete hollow column for connection and installation; place the steel rib shear member of the concrete hollow column at the bottom into the funnel-shaped cavity at the lower end of the concrete hollow column at the top; then align the longitudinal steel bars so that the longitudinal steel bars of the concrete hollow column at the bottom are inserted into the corresponding grouting sleeves of the concrete hollow column at the top;

[0026] The grouting sleeve portion is grouted, and then the hollow inner cavities of the upper concrete hollow column and the lower concrete hollow column are grouted as a whole, so that the upper concrete hollow column and the lower concrete hollow column form a whole.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. This invention incorporates pre-embedded steel rib shear connectors in the core of precast concrete hollow columns, and utilizes grouting sleeves for longitudinal reinforcement connections. Building upon existing grouting sleeves, this approach further addresses construction challenges in prefabricated column-to-column connections and improves connection reliability, enabling accurate positioning and simple, quick connections. It also enhances the bearing capacity and ductility of the column-to-column connection, ensuring node reliability.

[0029] 2. The hollow core precast concrete columns of this invention significantly reduce their mass. Compared to traditional prefabricated columns, they facilitate lifting and installation, reducing transportation costs. Furthermore, the factory's assembly line production ensures quality and accelerates project completion.

[0030] 3. The funnel-shaped design at the lower end of the precast column not only leaves ample space for the embedded grouting sleeve, but also complements the specific shape of the steel rib shear member (cylindrical upper portion, frustum-shaped lower portion). The combination of the two allows the cylindrical upper portion of the connector to easily fit into the funnel-shaped lower end of the precast column during installation, making installation more convenient and faster.

[0031] 4. The present invention uses pre-buried grouting sleeves to connect longitudinal steel bars to transfer the axial stress of the steel bars, while also ensuring that the upper and lower prefabricated columns will not twist. At the same time, the addition of steel rib shear members provides shear resistance. In addition, compared to the conventional grouting sleeve connection form for concealed projects, the present invention adopts an exposed grouting sleeve form, which makes it easier for construction personnel to check the grouting quality of the nodes after the sleeve is grouted. Compared with the problem of difficult and inaccurate positioning during the construction of traditional grouting sleeve connections, the connection structure of the present invention can be initially positioned through the steel rib shear member in the middle of the prefabricated column, which largely solves the problem of difficult positioning of the grouting sleeve connection.

[0032] 5. The welded spiral reinforcement on the outer periphery of the reinforced rib shear member further ensures the weld quality between the upper and lower steel sleeves, connecting the two sleeves into a single unit and enhancing shear resistance. Compared to conventional column components with weak torsional bearing capacity, the combined action of the steel sleeve and spiral reinforcement in this reinforced rib shear member significantly improves the joint's compression, bending, and shear bearing capacity, as well as its ductility. It also effectively enhances the torsional bearing capacity of the column-to-column connection. The combined connection structure of the grouting sleeve + reinforced rib shear member + post-cast concrete meets the design concept of "strong node, weak component." This effectively reduces damage to the column end connection during an earthquake.

[0033] 6. This invention solves the problems of difficult positioning, formwork maintenance, and extensive wet work associated with conventional pipe string connections, while also improving the shear resistance of pipe string joints. As long as the quality and precision of the steel shear members and upper and lower pipe strings are ensured in the factory, they can be quickly installed on-site, reducing the requirements for on-site construction personnel. The installation process does not require extensive wet work, improving construction efficiency and shortening the construction period.

[0034] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic diagram of an assembly of an assembled prefabricated hollow column shear connection structure provided by an embodiment of the present invention;

[0036] Figure 2 This is a schematic diagram of the distribution structure assembly of an assembled prefabricated hollow column shear connection structure provided by an embodiment of the present invention;

[0037] Figure 3 This is a structural diagram of an upper prefabricated column provided by an embodiment of the present invention;

[0038] Figure 4 This is a structural diagram of a lower prefabricated column provided by an embodiment of the present invention;

[0039] Figure 5 This is a schematic structural diagram of a steel rib shear member provided by an embodiment of the present invention;

[0040] Figure 6 This is a bottom view of a steel rib shear member provided by an embodiment of the present invention;

[0041] Figure 7 It is a structural schematic diagram of another prefabricated column provided in an embodiment of the present invention.

[0042] Description of reference numerals:

[0043] 1-upper precast column; 11-upper hollow core column body; 12-upper reinforcement cage; 121-upper longitudinal reinforcement; 122-upper spiral reinforcement; 13-grouting sleeve; 2-lower precast column; 21-lower hollow core column body; 22-lower reinforcement cage; 221-lower longitudinal reinforcement; 222-lower spiral reinforcement; 3-reinforced rib shear member; 31-steel sleeve; 311-cylindrical section; 312-truncated cone section; 32-spiral reinforcement; 33-anchor reinforcement. DETAILED DESCRIPTION

[0044] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the following is a detailed description of an assembled prefabricated hollow column shear-resistant connection structure and a construction method thereof proposed in accordance with the present invention, in conjunction with the accompanying drawings and specific implementation methods.

[0045] The aforementioned and other technical contents, features, and effects of the present invention are clearly presented in the following detailed description of the specific embodiments in conjunction with the accompanying drawings. Through the description of the specific embodiments, a deeper and more specific understanding of the technical means and effects adopted by the present invention to achieve the intended purpose can be obtained. However, the accompanying drawings are provided for reference and illustration purposes only and are not intended to limit the technical solutions of the present invention.

[0046] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations are intended to cover non-exclusive inclusion, such that an article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the article or device comprising the element.

[0047] Example 1

[0048] Please also see Figures 1 to 3 , Figure 1 This is a schematic diagram of an assembly of an assembled prefabricated hollow column shear connection structure provided by an embodiment of the present invention; Figure 2 This is a structural diagram of an upper prefabricated column provided by an embodiment of the present invention; Figure 3: This is a structural schematic diagram of a lower prefabricated column provided by an embodiment of the present invention. The assembled prefabricated hollow column shear-resistant connection structure includes an upper prefabricated column 1 and a lower prefabricated column 2 that cooperate with each other, wherein the upper prefabricated column 1 includes an upper hollow column body 11 and an upper steel cage 12 embedded in the upper hollow column body 11, and the lower end of the upper hollow column body 11 is also pre-embedded with multiple grouting sleeves 13; the lower prefabricated column 2 includes a lower hollow column body 21 and a lower steel cage 22 embedded in the lower hollow column body 21, the upper end of the lower steel cage 22 extends from the upper surface of the lower hollow column body 21 and can be inserted into the lower end of the corresponding grouting sleeve 13 to connect the upper prefabricated column 1 and the lower prefabricated column 2.

[0049] The precast concrete columns in this embodiment are hollow-core, significantly reducing their mass. Compared to traditional prefabricated columns, this facilitates their lifting and installation, reducing transportation costs. Furthermore, the factory's assembly line production ensures quality and accelerates project completion.

[0050] The upper end of the lower prefabricated column 2 is also provided with a steel rib shear member 3, which includes a steel sleeve 31 and a spiral steel bar 32 wrapped around the outer circumference of the steel sleeve 31. The lower end of the steel sleeve 31 is cast inside the lower hollow core column body 21 and is connected to the hollow inner cavity at the lower end of the lower hollow core column body 21. The upper end of the steel sleeve 31 extends from the upper surface of the lower hollow core column body 21 and can be inserted into the lower end of the hollow inner cavity of the upper hollow core column body 11 of the upper prefabricated column 1.

[0051] Furthermore, the middle portion of the upper hollow core column body 11 includes an axially arranged hollow inner cavity, the upper end of the hollow inner cavity is cylindrical, and the lower end is funnel-shaped. Specifically, the upper end of the funnel-shaped inner cavity is connected to the lower end of the cylindrical inner cavity and has the same diameter. From top to top, the diameter of the funnel-shaped inner cavity first gradually decreases and then gradually increases, thereby forming a funnel shape. When casting the upper precast column, the center position and size of the funnel shape at the lower end of the upper precast column must be strictly guaranteed to ensure that the steel rib shear member of the lower precast column can be smoothly placed therein during the later connection, and to ensure that the hollow core of the column can be smoothly poured with concrete as a whole.

[0052] Furthermore, the upper steel cage 12 includes a plurality of upper longitudinal steel bars 121 cast around the hollow inner cavity of the upper hollow core column body 11 and upper spiral steel bars 122 spirally wrapped around the outer periphery of the plurality of upper longitudinal steel bars 121, and the lower end of each upper longitudinal steel bar 121 is connected to a grouting sleeve 13, the main part of the grouting sleeve 13 is cast inside the upper hollow core column body 11, and the lower end opening of the grouting sleeve 13 is located on the lower surface of the upper hollow core column body 11.

[0053] This embodiment connects the longitudinal steel bars through pre-buried grouting sleeves to transfer the axial stress of the steel bars, while also ensuring that the upper and lower prefabricated columns will not twist; at the same time, the addition of steel rib shear members provides shear resistance; in addition, compared with the conventional grouting sleeve connection form of concealed projects, the present invention adopts an exposed grouting sleeve form, which is convenient for construction personnel to check the node grouting quality after the sleeve is grouting.

[0054] In this embodiment, a total of eight mutually parallel upper longitudinal steel bars 121 are arranged around the hollow inner cavity of the upper hollow core column body 11, wherein an upper longitudinal steel bar 121 is respectively arranged at the four corners, together forming a rectangular parallelepiped structure, and an upper longitudinal steel bar 121 is further arranged at the center of each side of the rectangular parallelepiped structure, and a grouting sleeve 13 is connected to the lower end of each upper longitudinal steel bar 121, and the upper longitudinal steel bar 121 is coaxially arranged with the corresponding grouting sleeve 13. In other words, the upper end of the grouting sleeve 13 is connected to the lower end of the corresponding upper longitudinal steel bar 121, and the entire body of the grouting sleeve 13 is embedded in the interior of the upper hollow core column body 11, and the lower end of the grouting sleeve 13 is flush with the lower surface of the upper hollow core column body 11, so that the lower end opening of the grouting sleeve 13 is exposed on the lower surface of the upper hollow core column body 11, so as to facilitate connection with the lower prefabricated column 2.

[0055] See Figure 5 and Figure 6 The steel sleeve 31 of this embodiment includes a cylindrical section 311 at the upper end and a truncated cone section 312 at the lower end, wherein the upper end of the truncated cone section 312 is equal to the diameter of the lower end of the cylindrical section 311 and is interconnected, and the diameter of the truncated cone section 312 gradually increases from top to bottom; the spiral reinforcement 32 is evenly spaced around the outer periphery of the cylindrical section 311 and the truncated cone section 312. It should be noted that during the manufacturing and welding process of the steel sleeve 31, it is necessary to ensure the dimensional accuracy of the cylindrical section 311 at the upper end and the truncated cone section 312 at the lower end, so as to ensure that the cylindrical section 311 at the upper end and the truncated cone section 312 at the lower end can be welded normally; secondly, the welding quality between the steel sleeves must be strictly guaranteed. After the steel sleeve is welded, when welding the outer spiral reinforcement, the distance between the welding points cannot be too long, and the welding quality must be strictly guaranteed so that the spiral reinforcement and the steel sleeve become a whole to withstand the applied force. The funnel-shaped lower end of the upper precast column provides ample space for pre-embedded grouting sleeves and complements the specific shape of the steel rib shear member 3 (cylindrical upper portion, frustum-shaped lower portion). Combined, the cylindrical upper portion of the connector easily fits into the funnel-shaped lower end of the precast column during installation, making installation more convenient and faster.

[0056] Furthermore, the steel rib shear member 3 is provided with a plurality of anchoring bars 33. One end of each of the anchoring bars 33 is evenly spaced and connected to the inner edge of the lower end of the truncated cone-shaped section 312, and the other ends extend longitudinally downward and parallel to each other. When pre-embedding the steel rib shear member 3, it is important to ensure that it is centered in the lower precast column and that the quality of the pre-embedding is ensured to ensure proper connection during construction and subsequent proper operation of the steel rib shear member 3.

[0057] Continue to see Figure 4 The lower reinforcement cage 22 of this embodiment includes a plurality of lower longitudinal reinforcements 221 cast around the hollow interior of the lower hollow core column body 21, and lower spiral reinforcements 222 spirally wrapped around the outer circumference of the plurality of lower longitudinal reinforcements 221. Similar to the upper longitudinal reinforcements 121, a total of eight mutually parallel lower longitudinal reinforcements 221 are disposed around the hollow interior of the lower hollow core column body 21 of this embodiment, wherein a lower longitudinal reinforcement 221 is disposed at each of the four corners, together forming a rectangular parallelepiped structure, and a lower longitudinal reinforcement 221 is disposed at the center of each side of the rectangular parallelepiped structure.

[0058] Preferably, the upper longitudinal reinforcement 121 and the lower longitudinal reinforcement 221 of this embodiment have the same number and are cast in the same position. The upper hollow core column body 11 and the lower hollow core column body 21 are both formed by pouring concrete. It should be noted that when tying the reinforcement cage (including the upper reinforcement cage 12 and the lower reinforcement cage 22), the position of the longitudinal reinforcement and the grouting sleeve must be accurately guaranteed to ensure that the longitudinal reinforcement of the lower precast column can be smoothly inserted into the grouting sleeve of the upper precast column when the upper and lower precast columns are connected.

[0059] See Figure 7 , Figure 7is a schematic diagram of the structure of another precast column provided by an embodiment of the present invention. In another embodiment of the present invention, the upper precast column 1 and the lower precast column 2 have identical structures. Specifically, in the lower precast column 2, the lower end of each lower longitudinal steel bar 221 includes a grouting sleeve, as shown in the upper precast column 1 above. In the upper precast column 1, the upper end of the hollow core column body 11 is provided with a steel rib shear member. The steel rib shear member includes a steel sleeve and spiral steel bars wrapped around the outer circumference of the steel sleeve, as shown in the lower precast column 2 above. In other words, during the factory prefabrication stage, the upper precast column 1 and the lower precast column 2 are manufactured to the same structure, with the steel rib shear member at the upper end and the funnel-shaped cavity and grouting sleeve at the lower end, so as to facilitate batch prefabrication. During the on-site construction stage, the steel rib shear member of one precast column is simply placed in the funnel-shaped cavity at the lower end of the other precast column, and the longitudinal steel bars are then aligned so that the longitudinal steel bars of the lower precast column are inserted into the corresponding grouting sleeve of the upper precast column. As needed, more than two prefabricated columns can be connected in sequence, and then the grouting sleeve part can be grouted, and the hollow inner cavity of all prefabricated columns can be grouted as a whole, so that all connected prefabricated columns are cast into a whole.

[0060] In this embodiment, the core of the precast concrete hollow column is pre-embedded with steel rib shear connectors, and the longitudinal steel bars are connected with grouting sleeves. On the basis of the sleeve grouting connection, the construction problems in the column-to-column connection of the prefabricated structure are further solved, and the reliability of the connection is improved, and accurate positioning and simple and quick connection can be achieved. At the same time, the bearing capacity of the column-to-column connection node is improved, and the ductility performance of the node is also improved, thereby ensuring the reliability of the connection node. Compared with the problem of difficult and inaccurate positioning during the construction of traditional grouting sleeve connections, the connection structure of the present invention can be preliminarily positioned through the steel rib shear connector in the middle of the precast column, which largely solves the problem of difficult positioning of the grouting sleeve connection.

[0061] The reinforced rib shear member of this embodiment is welded with spiral reinforcement around the periphery to further ensure the welding quality between the upper and lower steel sleeves, connecting the two sleeves into a single unit and also enhancing shear resistance. Compared with the weak torsional bearing capacity of traditional column components, the combined effect of the steel sleeve and spiral reinforcement in this reinforced rib shear member significantly improves the node's compression, bending, shear bearing capacity and ductility, and also effectively improves the torsional bearing capacity of the column-to-column connection. The combined connection structure of the grouting sleeve + reinforced rib shear member + post-cast concrete meets the design concept of "strong node, weak component". In the event of an earthquake, it can effectively reduce damage to the column end connection.

[0062] Example 2

[0063] Based on Example 1, this embodiment provides a construction method for an assembled prefabricated hollow column shear-resistant connection structure, which is used to prepare the assembled prefabricated hollow column shear-resistant connection structure described in Example 1. The construction method includes:

[0064] S1: Fabrication of a pre-embedded steel rib shear member: a cylindrical steel sleeve and a truncated cone steel sleeve are fabricated and welded together to form a whole, thereby forming a steel sleeve having a cylindrical section and a truncated cone section; spiral steel bars are welded to the outer circumference of the integral steel sleeve, and anchor steel bars are welded to the inner edge of the lower end of the truncated cone section, thereby forming the steel rib shear member;

[0065] S2: Fabrication of precast concrete hollow columns: Tie the steel cage, cast the precast hollow columns, embed the prefabricated steel rib shear members at the upper end of the hollow columns; embed the grouting sleeve at the lower end of the hollow columns, and shape the lower end of the hollow inner cavity of the hollow columns into a funnel shape;

[0066] S3: Use a sling to hook the reserved points of the concrete hollow column for connection and installation; place the steel rib shear member of the lower concrete hollow column into the funnel-shaped cavity at the lower end of the upper concrete hollow column, and then align the longitudinal steel bars so that the longitudinal steel bars of the lower concrete hollow column are inserted into the corresponding grouting sleeves of the upper concrete hollow column;

[0067] S4: Grouting is performed on the grouting sleeve portion, and then the hollow inner cavities of the upper concrete hollow column and the lower concrete hollow column are grouted as a whole, so that the upper concrete hollow column and the lower concrete hollow column form a whole.

[0068] In this embodiment of the present invention, precast concrete hollow columns are equipped with pre-embedded steel rib shear connectors and longitudinal reinforcements using grouting sleeves. Building upon the existing sleeve grouting method, this approach further addresses construction challenges in prefabricated column-to-column connections and improves connection reliability, enabling accurate positioning and simple, quick connections. It also enhances the bearing capacity and ductility of the column-to-column connection, ensuring the reliability of the connection.

[0069] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. An assembled prefabricated hollow column shear connection structure, characterized in that: It comprises an upper prefabricated column (1) and a lower prefabricated column (2) that cooperate with each other, wherein: The upper prefabricated column (1) comprises an upper hollow core column body (11) and an upper steel cage (12) embedded in the upper hollow core column body (11); a plurality of grouting sleeves (13) are also pre-buried at the lower end of the upper hollow core column body (11); The lower prefabricated column (2) comprises a lower hollow core column body (21) and a lower steel cage (22) embedded in the lower hollow core column body (21); the upper end of the lower steel cage (22) extends from the upper surface of the lower hollow core column body (21) and can be inserted into the lower end of the corresponding grouting sleeve (13) to connect the upper prefabricated column (1) and the lower prefabricated column (2); The upper end of the lower prefabricated column (2) is also provided with a steel rib shear member (3), the steel rib shear member (3) comprising a steel sleeve (31) and a spiral steel bar (32) wound around the outer periphery of the steel sleeve (31), the lower end of the steel sleeve (31) is cast inside the lower hollow core column body (21) and is connected to the hollow inner cavity at the lower end of the lower hollow core column body (21), the upper end of the steel sleeve (31) extends from the upper surface of the lower hollow core column body (21) and can be inserted into the lower end of the hollow inner cavity of the upper hollow core column body (11) of the upper prefabricated column (1); The middle portion of the upper hollow core column body (11) comprises an axially arranged hollow inner cavity, the upper end of the hollow inner cavity is cylindrical, and the lower end is funnel-shaped; The steel sleeve (31) comprises a cylindrical section (311) at the upper end and a truncated cone section (312) at the lower end, wherein the upper end of the truncated cone section (312) and the lower end of the cylindrical section (311) have the same diameter and are connected to each other, and the diameter of the truncated cone section (312) gradually increases from top to bottom; the spiral steel bars (32) are wound around the outer circumference of the cylindrical section (311) and the truncated cone section (312) at equal intervals; The steel rib shear member (3) is further provided with a plurality of anchoring steel bars (33), one end of each of the plurality of anchoring steel bars (33) being connected to the inner edge of the lower end of the truncated cone section (312) at equal intervals, and the other ends of the plurality of anchoring steel bars (33) extending longitudinally downward in parallel with each other.

2. The assembled prefabricated hollow column shear connection structure according to claim 1, characterized in that: The upper steel cage (12) comprises a plurality of upper longitudinal steel bars (121) cast around the hollow inner cavity of the upper hollow core column body (11) and upper spiral steel bars (122) spirally wound around the outer periphery of the plurality of upper longitudinal steel bars (121), and the lower end of each upper longitudinal steel bar (121) is connected to a grouting sleeve (13), the main part of the grouting sleeve (13) is cast inside the upper hollow core column body (11), and the lower end opening of the grouting sleeve (13) is located on the lower surface of the upper hollow core column body (11).

3. The assembled prefabricated hollow column shear connection structure according to claim 2, characterized in that: The lower steel cage (22) comprises a plurality of lower longitudinal steel bars (221) cast around the hollow inner cavity of the lower hollow core column body (21) and lower spiral steel bars (222) spirally wound around the outer periphery of the plurality of lower longitudinal steel bars (221).

4. The assembled prefabricated hollow column shear connection structure according to claim 3, characterized in that: The upper longitudinal steel bars (121) and the lower longitudinal steel bars (221) have the same number and casting position.

5. The assembled prefabricated hollow column shear connection structure according to claim 1, characterized in that: The upper hollow core column body (11) and the lower hollow core column body (21) are both formed by pouring concrete.

6. The assembled prefabricated hollow column shear connection structure according to any one of claims 1 to 5, characterized in that: The upper prefabricated column (1) and the lower prefabricated column (2) have exactly the same structure, wherein: In the lower prefabricated column (2), the lower end of each lower longitudinal steel bar (221) is connected to a grouting sleeve; In the upper prefabricated column (1), a steel rib shear member is provided at the upper end of the upper hollow core column body (11), and the steel rib shear member comprises a steel sleeve and a spiral steel bar wound around the outer circumference of the steel sleeve.

7. A construction method for an assembled prefabricated hollow column shear connection structure, characterized in that: For preparing the assembled prefabricated hollow column shear-resistant connection structure according to claim 6, the construction method comprises: S1: Fabrication of a pre-embedded steel rib shear member: a cylindrical steel sleeve and a truncated cone steel sleeve are fabricated and welded together to form a whole, thereby forming a steel sleeve having a cylindrical section and a truncated cone section; spiral steel bars are welded to the outer circumference of the integral steel sleeve, and anchor steel bars are welded to the inner edge of the lower end of the truncated cone section, thereby forming the steel rib shear member; S2: Fabrication of precast concrete hollow columns: Tie the steel cage, cast the precast hollow columns, embed the prefabricated steel rib shear members at the upper end of the hollow columns; embed the grouting sleeve at the lower end of the hollow columns, and shape the lower end of the hollow inner cavity of the hollow columns into a funnel shape; S3: Use a sling to hook the reserved points of the concrete hollow column for connection and installation; place the steel rib shear member of the lower concrete hollow column into the funnel-shaped cavity at the lower end of the upper concrete hollow column, and then align the longitudinal steel bars so that the longitudinal steel bars of the lower concrete hollow column are inserted into the corresponding grouting sleeves of the upper concrete hollow column; S4: Grouting is performed on the grouting sleeve portion, and then the hollow inner cavities of the upper concrete hollow column and the lower concrete hollow column are grouted as a whole, so that the upper concrete hollow column and the lower concrete hollow column form a whole.

Images