Partially reinforced fully assembled prestressed concrete column-column connection system and construction method thereof

Abstract

The present invention relates to a fully assembled prestressed concrete column-to-column connection system with local reinforcement and a construction method thereof. The prestressed concrete column-to-column connection system comprises: an upper precast column, an insertion portion extending from the bottom of the upper precast column, a prestressed tendon sleeve being pre-embedded transversely along at least one direction on the insertion portion, and longitudinal steel bars extending around the column; a lower precast column, a receiving portion being formed at the top of the lower precast column, a prestressed tendon through hole corresponding to the prestressed tendon sleeve being preset on the receiving portion, and longitudinal steel bars extending around the column; a middle precast connection assembly, the middle precast connection assembly being arranged between the upper precast column and the lower precast column, and respectively connecting the longitudinal steel bars extending from the upper precast column and the lower precast column to form a local hollow reinforcement zone. The prestressed concrete column-to-column connection system of the present invention can solve the problem of excessive concentrated stress at the existing assembled column-to-column connection nodes, which leads to poor structural durability, poor seismic performance and low structural assembly rate.

Description

Technical Field

[0001] The invention relates to the field of assembled concrete building structures, and in particular to a partially reinforced fully assembled prestressed concrete column connection system and a construction method thereof. Background Art

[0002] Prefabricated buildings, also known as prefabricated buildings, are a construction method that mainly involves prefabricating building components in factories or other production sites, and then transporting these components to the construction site for assembly and installation. Compared with traditional on-site construction, prefabricated buildings have the advantages of shorter construction period, resource conservation, and easier quality control.

[0003] Prefabricated buildings are buildings that meet the predetermined functional requirements after the main components are manufactured in the factory, transported to the site and quickly installed. They have the characteristics of building industrialization. Compared with the traditional construction method that mainly relies on on-site construction, the advanced features of prefabricated assembly technology are mainly reflected in: factory-based production of components, mechanized on-site construction, and scientific organization and management, which can effectively reduce construction waste, reduce the adverse impact of construction on the environment, save labor and shorten the construction period. However, the current prefabricated column structure has problems such as low assembly rate, insufficient bearing capacity of assembled components, stress concentration, unstable column node connection, and easy rupture at the connection when the column node transfers horizontal load.

[0004] Based on the above problems, it is urgent to propose a new type of prefabricated column structure system and its construction method to effectively solve the problems existing in the project and meet the needs of engineering construction. Summary of the invention

[0005] In view of the deficiencies in the prior art, the main purpose of the present invention is to provide a fully assembled prestressed concrete column-to-column connection system with local reinforcement and a construction method thereof, so as to solve at least one of the problems of excessive concentrated stress at the connection nodes of existing assembled columns, which leads to poor structural durability, seismic performance and low structural assembly rate.

[0006] The technical solution of the present invention is as follows:

[0007] The present invention first provides a fully assembled prestressed concrete column-column connection system with local reinforcement, comprising: an upper prefabricated column, an insertion portion extending from the bottom of the upper prefabricated column, the insertion portion being pre-buried with prestressed tendon sleeves in two orthogonal directions, the prestressed tendon sleeves in the two directions being arranged alternately up and down, and longitudinal steel bars extending around the column; a lower prefabricated column, a receiving portion being formed on the top of the lower prefabricated column, the receiving portion being of the same shape as the insertion portion but slightly larger in size, the receiving portion being pre-set with prestressed tendon through holes corresponding to the prestressed tendon sleeves, and longitudinal steel bars extending around the column; a middle The middle prefabricated connection component is arranged between the upper prefabricated column and the lower prefabricated column, and the longitudinal steel bars extending from the upper prefabricated column and the lower prefabricated column are respectively connected to form a local hollow reinforcement area; during assembly, the upper prefabricated column is inserted into the receiving part of the lower prefabricated column through the insertion part through the middle prefabricated connection component, and the extended longitudinal steel bars are respectively connected and fixed to the middle prefabricated connection component, prestressed steel bars are inserted into the prestressed steel bar through holes and prestressed steel bar sleeves and tensioned and anchored, and concrete is poured into the local hollow reinforcement area to form a local hollow reinforcement section of the column node.

[0008] In some feasible embodiments, the insertion portion of the upper prefabricated column is a prism-shaped end cap, and anti-burst bending ribs are arranged inside the concrete of the end cap, distributed in the longitudinal and transverse directions, and at least three ribs are arranged in the same direction to increase the overall strength of the end cap;

[0009] And / or, the receiving portion of the lower prefabricated column is a prism-shaped cup-shaped mouth, and anti-burst bending reinforcement is arranged inside the cup-shaped concrete, distributed in the longitudinal and transverse directions, and at least three are arranged in the same direction to increase the overall strength of the cup-shaped mouth.

[0010] In some feasible embodiments, the bottom of the prism-shaped end is embedded with an upper column and a lower bottom plate, the upper column and the lower bottom plate extend upwards with connecting steel bars that are tied and fixed with the anti-burst bending bars, and the upper column and the lower bottom plate have positioning grooves;

[0011] And / or, a lower column upper top plate is embedded in the bottom of the prism-shaped cup mouth, a connecting steel bar is extended downward from the lower column upper top plate to be tied and fixed with the anti-burst bending reinforcement, and a positioning pressure block is reserved on the lower column upper top plate.

[0012] In some feasible embodiments, the middle prefabricated connection assembly includes a box-type steel frame, which is composed of upper and lower cross beams and vertical columns, and the middle and surrounding sides of the box-type steel frame are hollowed out.

[0013] In some feasible embodiments, the upper and lower cross beams of the box-type steel frame are respectively pre-set with upper longitudinal steel bar connection grooves and lower longitudinal steel bar connection grooves, the upper longitudinal steel bar connection grooves are used to connect the longitudinal steel bars extending from the upper prefabricated columns, and the lower longitudinal steel bar connection grooves are used to connect the longitudinal steel bars extending from the lower prefabricated columns.

[0014] In some feasible embodiments, the columns of the box-type steel frame are preset with corner longitudinal steel bar connection holes that pass through from top to bottom, and two upper and lower installation holes are reserved on one of the inner side surfaces of the column. The installation holes are connected to the corner longitudinal steel bar connection holes but do not pass through the column laterally. The two installation holes are respectively used to connect and fix the longitudinal steel bars extending out of the upper prefabricated column and the lower prefabricated column.

[0015] In some feasible embodiments, the middle prefabricated connection assembly further includes a tension plate, an upper end of which is embedded in the upper longitudinal steel bar connection groove, and a lower end of which is embedded in the lower longitudinal steel bar connection groove.

[0016] In some feasible embodiments, the tension plate is in an I-shape, and both ends of the I-shape are formed as recessed slots that are snap-connected to the upper longitudinal steel bar connecting slot and the lower longitudinal steel bar connecting slot.

[0017] In some feasible embodiments, the upper longitudinal steel bar connection groove and the lower longitudinal steel bar connection groove are both strip grooves along the length direction of the cross beam.

[0018] The present invention also provides a construction method according to the above-mentioned prestressed concrete column-column connection system, comprising the following steps: S10: the upper prefabricated column component is manufactured in the factory, wherein the longitudinal steel bars are extended out on all sides, straight threads are polished on the extended ends, and anti-burst bending ribs are provided, and the lower bottom plate of the upper column is welded to be connected and fixed with the steel bars in the column, and the upper and lower prestressed rib sleeves are pre-buried at the same time; S20: the lower prefabricated column component is manufactured in the factory, wherein the longitudinal steel bars are extended out on all sides, straight threads are polished on the extended ends, and anti-burst bending ribs are provided, and the upper top plate of the lower column is welded to be connected and fixed with the steel bars in the column, and the upper and lower prestressed rib through holes are pre-set at the same time; S30: the middle prefabricated connection assembly is manufactured in the factory, adopting a box-type steel frame structure, with upper and lower crossbeams and four corner columns on all sides, the upper and lower crossbeams are provided with longitudinal steel bar connection grooves, and the four corner columns are provided with longitudinal steel bar connection channels; S40: the prefabricated tension plate is designed with recessed slots near the edges of both ends, the tension plate is extended into the longitudinal steel bar connection groove of the middle prefabricated connection assembly, and rotated 90° to be fixed; S50: Assemble the lower prefabricated column and the middle prefabricated connection assembly, hoist the middle prefabricated connection assembly and drop it on the lower prefabricated column, set corner stacking blocks at the four corners of the middle prefabricated connection assembly, extend the longitudinal steel bars and insert them into the longitudinal steel bar connection grooves and the longitudinal steel bar connection channels, install the straight threaded sleeves, and tighten them so that the longitudinal steel bars are completely connected and fixed to the middle prefabricated connection assembly; S60: Assemble the upper prefabricated column and the middle prefabricated connection assembly, hoist the upper prefabricated column and drop it on the middle prefabricated connection assembly, and the four corners of the middle prefabricated connection assembly Set the corner stacking blocks, extend the longitudinal steel bars and insert them into the longitudinal steel bar connection grooves and the longitudinal steel bar connection channels, install the straight threaded sleeves, and tighten them to make the longitudinal steel bars completely connected and fixed with the middle prefabricated connection components; S70: install the prestressed tendons and make them penetrate into the prestressed tendon through holes of the lower prefabricated columns and the prestressed tendon sleeves of the upper prefabricated columns for pre-tensioning; S80: pour the micro-expansive concrete, install the formwork and pour the micro-expansive concrete, and then perform secondary tensioning and anchoring to form a local hollow reinforcement section of the column node.

[0019] The beneficial effects of the present invention over the prior art are as follows: the present invention proposes a partially reinforced fully assembled prestressed concrete column-to-column connection system and a construction method thereof, the column-to-column connection system can effectively improve the node bending strength of the column connection node, and effectively improve the bearing capacity of the column. This enables the structure to support a larger load, or to design a smaller component under the same load. At the same time, the component can significantly reduce the deformation and deflection of the node of the column under the horizontal impact of the earthquake, reduce the formation of cracks, and thus improve the durability of the structure.

[0020] In terms of improving the bearing capacity of the nodes, the present invention improves the compressive bearing capacity of the nodes by combining reinforced concrete with a prefabricated connection component composite structure, thereby overcoming the problem of insufficient bearing capacity of traditional nodes.

[0021] In terms of reducing stress concentration, the present invention effectively shares the stress transmitted from the upper column by the middle prefabricated connection assembly, and has more cross-sections to bear the stress generated by the initial installation, thus avoiding the possible axial compression damage caused by the stress concentration at the end caused by the gravity exerted on the upper column being directly transmitted to the end.

[0022] The present invention adopts a prism-shaped insert-type end and a "cup mouth" (inverted U)-shaped groove in the prefabricated column, so that the upper and lower columns can be connected by insertion to strengthen the connection between the upper and lower columns, and the assembly is simple and convenient. The prism-shaped insert-type end is provided with anti-burst bending ribs inside, which can enhance the strength and ductility of the column end, and after the prestressed ribs are inserted, the concrete of the column end can be prevented from bursting under horizontal action.

[0023] Longitudinal steel bars are extended around the column as tensile steel bars. The longitudinal steel bars can be tensioned by screwing in straight threaded sleeves to supplement the connection strength when the longitudinal steel bars of the upper and lower columns are not cut off.

[0024] In order to overcome the instability of the column node connection, the column-to-column connection system of the present invention includes multiple positioning and installation structures. First, a steel bottom plate with a positioning groove is embedded in the lower part of the prism-shaped inserted column end, and is nested and positioned with the positioning pressure block of the lower column during assembly; second, the upper and lower columns are positioned and connected with the middle prefabricated connection assembly by passing the extended longitudinal steel bars through the notch of the middle prefabricated connection assembly. Finally, concrete is poured to make the node a stable whole.

[0025] Tensile and compressive components are designed in the column-to-column connection system to support the deadweight of the upper column during post-casting without damaging the prefabricated structure. A tensile plate is set in the middle prefabricated connection component to meet the tension of the upper and lower column reinforcements on the middle prefabricated connection component, and corner stacking blocks are set at the corners of the column to effectively transfer the pressure of the upper column while adjusting the height of the structure.

[0026] A steel bottom plate with a positioning groove is embedded in the lower part of the end of the prism-type inserted column, and a positioning pressure block is fixed in the middle of the open column. The pressure block is welded to the lower steel top plate. The pressure block can be partially embedded in the upper column when the upper and lower columns are connected. This arrangement can well transmit the deadweight pressure of the upper column and avoid stress concentration.

[0027] The upper column end is inserted into the cup-shaped lower column, and the prestressed steel bars are inserted to further fix the upper and lower columns. The prestressed steel bars are tensioned to prevent the end from being dislocated and cracked under horizontal tension and compression.

[0028] It should be understood that the implementation of any embodiment of the present invention does not mean that multiple or all of the above-mentioned beneficial effects must be possessed or achieved at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0030] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment in size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0031] Figure 1 It is an overall schematic diagram of a partially reinforced fully assembled prestressed concrete column-column connection system according to an embodiment of the present invention;

[0032] Figure 2 It is an exploded schematic diagram of a partially reinforced fully assembled prestressed concrete column-column connection system according to an embodiment of the present invention;

[0033] Figure 3 It is a schematic diagram of the upper prefabricated column structure in the partially reinforced fully assembled prestressed concrete column-column connection system according to an embodiment of the present invention;

[0034] Figure 4 It is a schematic diagram of the structure of the lower prefabricated column in the partially reinforced fully assembled prestressed concrete column-column connection system according to an embodiment of the present invention;

[0035] Figure 5 A schematic top view of a lower prefabricated column in a partially reinforced fully assembled prestressed concrete column-column connection system according to an embodiment of the present invention;

[0036] Figure 6 It is a schematic structural diagram of the middle prefabricated connection assembly of the partially reinforced fully assembled prestressed concrete column-to-column connection system according to an embodiment of the present invention;

[0037] Figure 7 It is a partial schematic diagram of the middle prefabricated connection assembly of the partially reinforced fully assembled prestressed concrete column-to-column connection system according to an embodiment of the present invention;

[0038] Figure 8 It is a schematic diagram of the tension plate of the middle prefabricated connection assembly of the partially reinforced fully assembled prestressed concrete column-to-column connection system according to an embodiment of the present invention;

[0039] Fig. 9A schematic diagram of a corner stacking block of a partially reinforced fully assembled prestressed concrete column-column connection system according to an embodiment of the present invention;

[0040] Fig.10 It is a (partial) assembly schematic diagram of a partially reinforced fully assembled prestressed concrete column-column connection system according to an embodiment of the present invention;

[0041] Fig.11 A schematic diagram of local reinforcement of a fully assembled prestressed concrete column-to-column connection system with local reinforcement according to an embodiment of the present invention;

[0042] Fig.12 It is a schematic diagram of the overall casting of a partially reinforced fully assembled prestressed concrete column-column connection system according to an embodiment of the present invention;

[0043] Fig.13 The present invention is a schematic block diagram of the construction process of a fully assembled prestressed concrete column-to-column connection system with local reinforcement according to an embodiment of the present invention.

[0044] Markings in the figure:

[0045] 100-Prestressed concrete column-column connection system;

[0046] 1-upper prefabricated column; 11-insertion part; 12-prestressed tendon sleeve; 13-upper column lower base plate; 14-positioning groove;

[0047] 2-lower prefabricated column; 21-receiving part; 22-prestressed tendon through hole; 23-top plate on lower column; 24-positioning pressure bearing block;

[0048] 3- middle prefabricated connection assembly; 31- upper longitudinal steel bar connection groove; 32- lower longitudinal steel bar connection groove; 33- corner longitudinal steel bar connection channel; 34- installation opening; 35- tension plate; 36- recessed card slot;

[0049] 4-longitudinal reinforcement; 41-anti-burst bending reinforcement;

[0050] 5- Corner stacking blocks;

[0051] 200-Construction method.

[0052] The same or corresponding symbols in the drawings indicate the same or corresponding parts. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solution and advantages of the embodiments of the present invention more clearly understood, the embodiments of the present invention are further described in detail below in conjunction with the embodiments and drawings. Here, the illustrative embodiments of the present invention and their description are used to explain the present invention, but are not intended to limit the present invention.

[0054] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] It should be understood that the terms "include / comprise", "consist of..." or any other variations are intended to cover non-exclusive inclusion, so that a product, device, process or method that includes a series of elements includes not only those elements, but also may include other elements not explicitly listed when necessary, or also includes elements inherent to such product, device, process or method. In the absence of more restrictions, the elements defined by the sentence "include / comprise...", "consist of..." do not exclude the presence of other identical elements in the product, device, process or method that includes the elements.

[0056] It is also necessary to understand that terms such as "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" to indicate directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device, component or structure must have a specific direction, be constructed or operate in a specific direction, and should not be understood as a limitation on the present invention.

[0057] 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 one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0058] Prefabricated concrete structure: Prefabricated concrete structure refers to a structural form in which concrete components are prefabricated in a factory or prefabrication yard and then transported to the site for assembly. This structural form uses prefabricated components and is combined and connected to form an overall concrete structural system.

[0059] In order to meet the needs of engineering construction, the present invention provides a fully assembled prestressed concrete column-to-column connection system with local reinforcement and a construction method thereof, so as to solve the problem that the existing assembled column connection nodes have excessive concentrated stress, resulting in poor structural durability, seismic performance and low structural assembly rate.

[0060] The implementation of the present invention is described in detail below in conjunction with preferred embodiments.

[0061] See also Figure 1 , Figure 2 , exemplarily showing a partially reinforced fully assembled prestressed concrete column-to-column connection system provided by the present invention, the prestressed concrete column-to-column connection system 100 mainly includes: an upper prefabricated column 1, a lower prefabricated column 2, and a middle prefabricated connection component 3.

[0062] In an embodiment of the present invention, the upper precast column 1 and the lower precast column 2 are both precast reinforced concrete structures, which are shown in the figure as square cross-section columns. Longitudinal steel bars 4 are arranged around the inside of the cross-section as force-bearing steel bars. The spacing between the longitudinal steel bars 4 is ≤100mm to ensure the bearing capacity of the core area of ​​the column end node. Multiple (for example, three) bars are arranged on one side of the square cross-section. The upper precast column 1 and the lower precast column 2 are connected and fixed by a middle precast connection component 3. The middle precast connection component 3 is used to connect the upper and lower longitudinal steel bars and assist the upper and lower columns to accurately dock, and local reinforcement is performed at the connection node to achieve a fully assembled prestressed concrete column-to-column connection. The composite structure of reinforced concrete combined with precast connection components is used to improve the compressive bearing capacity of the node, overcome the problem of insufficient bearing capacity of traditional nodes, and avoid excessive stress concentration at the connection node, thereby improving the durability, seismic performance and assembly rate of the structure. The realization of specific functions will be elaborated in detail later.

[0063] like Figure 3 As shown, an achievable structural form of an upper prefabricated column 1 applied to the column-to-column connection system of the present invention is exemplified, an insertion portion 11 extends downward from the bottom of the upper prefabricated column 1, and the so-called insertion portion is used to insert downward into the lower prefabricated column 2 at the bottom to achieve connection. The specific form and construction method of the insertion portion can be various, but the insertion portion 11 is transversely pre-embedded with a prestressed steel sleeve 12 along at least one direction, and longitudinal steel bars 4 extend around the column, that is, the column body extends from the bottom surface of the column, in order to connect with the middle prefabricated connection assembly 3.

[0064] For example Figure 1 , Figure 4 As shown, an achievable structural form of a lower prefabricated column 2 applied to the column-to-column connection system of the present invention is exemplified. Corresponding to the upper prefabricated column 1, a receiving portion 21 is formed on the top of the lower prefabricated column 2. The so-called receiving portion is used to receive the insertion portion 11 of the upper prefabricated column 1 to achieve the connection between the two. The specific form and construction method of the receiving portion can also be various. However, in order to facilitate the matching connection, the shape of the receiving portion 21 is consistent with the shape of the insertion portion 11, but the size should be larger than the size of the insertion portion 11, so that there is a certain gap between the two after the insertion, which is used for the subsequent pouring of micro-expansion concrete. In addition, a prestressed tendon through hole 22 ( Figure 4As shown in the figure, a prestressed steel sleeve 12 has been installed, and longitudinal steel bars 4 are also extended around the column.

[0065] Preferably, prestressed tendon sleeves 12 are pre-embedded in two orthogonal directions on the insertion portion 11, and the prestressed tendon sleeves 12 in the two directions are arranged alternately up and down. Correspondingly, the prestressed tendon through holes 22 on the receiving portion 21 are arranged alternately up and down in two orthogonal directions. The upper and lower rows maintain a predetermined vertical distance so that the prestressed tendons can just pass through the two pre-embedded prestressed tendon sleeves after the upper column is docked with the lower column, forming a stable tensioning constraint. By performing prestressing in different directions, the prestressed tendons after tensioning will strongly constrain the end of the insertion portion to prevent the end from being pulled out and falling off in natural disasters such as earthquakes and impacts, so that the upper and lower columns are tightly connected.

[0066] Preferably, the longitudinal steel bars 4 extending from the ends of the upper precast column 1 and the lower precast column 2 extend out 10-15 cm from the column ends, and the ends of the extending steel bars are ground into straight threads to facilitate the later connection with straight thread sleeves. As longitudinal tensile steel bars, the longitudinal steel bars can be tensioned by screwing in the straight thread sleeves to supplement the internal connection performance internal force when the longitudinal steel bars of the upper and lower columns are not cut off.

[0067] See also Figure 1 , Figure 2 The middle prefabricated connection assembly 3 provided in the embodiment of the present invention is arranged between the upper prefabricated column 1 and the lower prefabricated column 2. The middle prefabricated connection assembly 3 has a hollow or hollow structure in the middle, and is respectively connected to the longitudinal steel bars 4 extending from the upper prefabricated column 1 and the lower prefabricated column 2. After the steel bar connection and the prestressed bar connection are completed, micro-expansion concrete is poured here to form a local hollow reinforcement section. In this way, the stress concentration at the end caused by the gravity of the upper column directly transmitted to the end head, which may cause axial compression damage, is avoided. The middle prefabricated connection assembly 3 well shares the stress transmitted from the upper column, so that more sections can bear the stress generated by the initial installation.

[0068] During assembly, the upper prefabricated column 1 passes through the hollow structure of the middle prefabricated connecting component 3 through the insertion part 11, and is inserted into the receiving part 21 of the lower prefabricated column 2. The longitudinal steel bars 4 extending up and down are respectively connected and fixed to the middle prefabricated connecting component 3, and prestressed tendons are inserted into the prestressed tendon through holes 22 and the prestressed tendon sleeves 12 and tensioned and anchored. Concrete is poured into the local hollow reinforcement area to form a local hollow reinforcement section of the column node. In this way, the concrete at the node is constrained, the compressive performance of the core concrete and the connection between the upper and lower columns are improved, and the overall effect of local reinforcement of the column node is formed.

[0069] In a preferred embodiment of the present invention, Figure 3 The insertion part 11 of the upper precast column 1 is a prism-shaped end, or a "T"-shaped insertion end, which is connected to the lower column downward, and an anti-burst bending reinforcement 41 is arranged inside the concrete of the end, see Fig.11 As shown, the anti-burst bending ribs 41 are distributed in the longitudinal and transverse directions, and three ribs are arranged in the same direction to increase the overall strength and stability of the end.

[0070] In a preferred embodiment of the present invention, Figure 4 , Figure 5 The receiving portion 21 of the lower precast column 2 is an open end, specifically a prism-shaped cup mouth, or an inverted U-shaped cup mouth. Anti-burst bending reinforcement is arranged inside the cup mouth concrete in the same way to improve the compressive strength of the "cup mouth" type open end and control its opening deformation.

[0071] In another preferred embodiment of the present invention, an upper column lower base plate 13 is embedded in the bottom of the prism-shaped end of the insertion portion 11, and connecting steel bars extend upward from the upper column lower base plate 13. The figure shows that four connecting steel bars are welded on the upper surface of the upper column lower base plate 13, which is connected and fixed to the steel bars inside the end by means of the connecting steel bars. The upper column lower base plate 13 is embedded in the bottom surface of the end and exposed, and can be used as a bottom template when pouring concrete.

[0072] In another preferred embodiment of the present invention, a lower column upper plate 23 is embedded in the bottom of the prism-shaped cup mouth of the receiving portion 21. The lower column upper plate 23 is embedded in the concrete, and connecting steel bars and bent bars are extended downward for binding and fixing, and are cast together with the concrete to relieve the concentrated compressive stress on the upper structure of the lower column after the upper and lower columns are combined.

[0073] In addition, an inward-concave positioning groove 14 is left on the lower base plate 13 of the upper column, and an outward-convex positioning pressure block 24 is left on the upper top plate 23 of the lower column. The positioning pressure block 24 is welded to the upper top plate 23 of the lower column as a positioning and installation structure. During assembly, the positioning groove 14 and the positioning pressure block 24 below are nested and positioned to achieve the installation and positioning of the upper and lower columns. At the same time, the positioning pressure block 24 needs to have a certain bearing strength (a high-strength steel block can be used) and is used as a pressure block to bear the dead weight of the upper column.

[0074] In a preferred embodiment of the present invention, see Figure 1 , Figure 2 , Figure 6 , providing a feasible middle prefabricated connection component structure form, the middle prefabricated connection component 3 is designed as a box-type steel frame structure, the box-type steel frame is composed of upper and lower cross beams and four corner columns, the middle and surrounding sides of the box-type steel frame are hollowed out, wherein the middle hollowing is used for the prism-shaped end of the insertion part 11 of the upper prefabricated column 1 to insert and pass through and further enter the prism-shaped cup mouth of the receiving part 21 of the lower prefabricated column 2, and the surrounding sides are hollowed out for passing the longitudinal steel bars 4 extending from the upper and lower columns and connected and fixed with straight threaded sleeves.

[0075] In a further preferred embodiment of the present invention, in order to connect with the longitudinal steel bars 4 extending from the upper and lower columns, the upper and lower crossbeams of the box-type steel frame are arranged relatively, the upper and lower crossbeams are hollowed out, and the upper and lower crossbeams are respectively pre-set with an upper longitudinal steel bar connection groove 31 and a lower longitudinal steel bar connection groove 32, the upper longitudinal steel bar connection groove 31 is used to connect the longitudinal steel bars 4 extending from the upper prefabricated column 1, and the lower longitudinal steel bar connection groove 32 is used to connect the longitudinal steel bars 4 extending from the lower prefabricated column 2. The steel bar connection groove is provided on the upper and lower crossbeams and runs through the height of the upper and lower crossbeams. When connecting, the longitudinal steel bars 4 extending from the upper prefabricated column 1 pass through the upper longitudinal steel bar connection groove 31 from above and are connected and fixed by a straight thread sleeve at the bottom of the upper crossbeam, and the longitudinal steel bars 4 extending from the lower prefabricated column 2 pass through the lower longitudinal steel bar connection groove 32 from below and are connected and fixed by a straight thread sleeve at the top of the lower crossbeam. The hollow space between the upper and lower crossbeams serves as a space for the longitudinal steel bars to pass through and an operating space for connecting the straight thread sleeve. In this way, the upper and lower columns are butt-connected and fixed in the longitudinal direction by means of the middle prefabricated connection assembly 3, and at the same time, the prestressed tendons are tensioned and anchored in the transverse direction to effectively constrain the concrete at the node.

[0076] In addition, the notch of the middle prefabricated connection component 3 also serves as a positioning and installation structure, and the positioning connection between the upper and lower columns and the middle prefabricated connection component is achieved by extending the longitudinal steel bars 4 through the notch of the middle prefabricated connection component 3.

[0077] Preferably, the upper longitudinal steel bar connection groove 31 and the lower longitudinal steel bar connection groove 32 are both strip grooves along the length direction of the beam, which can easily accommodate the arrangement of multiple longitudinal steel bars on a single side of a square cross-section and can also meet the requirements of steel bar arrangements with different ratios.

[0078] Furthermore, in addition to the longitudinal steel bar connection grooves preset in the upper and lower cross beams, the four corner columns of the box-type steel frame are preset with corner longitudinal steel bar connection holes 33 that pass through from top to bottom, and the corner longitudinal steel bar connection holes 33 are used to pass the corner longitudinal steel bars of the upper and lower columns. It should be noted that the corner longitudinal steel bar connection holes 33 and the longitudinal steel bar connection grooves are separately provided and are not pulled through and connected together, so that the cross-section of the beam and column is less weakened, and the pressure bearing capacity of the entire middle prefabricated connection assembly 3 will not be greatly weakened.

[0079] Furthermore, in order to facilitate the installation and connection of the longitudinal reinforcement at the corners of the upper and lower columns, e.g. Figure 7 As shown, two upper and lower installation holes 34 are reserved on one of the inward sides of the four corner columns, and the installation holes 34 are connected to the corner longitudinal steel bar connection holes 33. The figure shows that the two installation holes 34 are both square. The upper installation hole 34 is used by operators to connect the longitudinal steel bars 4 extending from the upper column with the middle prefabricated connection component 3, and the lower installation hole 34 is used by operators to connect the longitudinal steel bars 4 extending from the lower column with the middle prefabricated connection component 3. By setting the upper and lower installation holes 34, the column is prevented from being weakened by penetration in the height direction.

[0080] In addition, the installation opening 34 is connected to the longitudinal reinforcement connection channel 33 at the corner but does not penetrate the column horizontally, that is, Figure 7 As shown in the figure, the back side of the column is not penetrated, so as to ensure that the column is not weakened in the horizontal direction, and to ensure that there is a through-column structure with a certain width section, thereby retaining the column effect.

[0081] In a further preferred embodiment of the present invention, in order to improve the tensile strength of the middle prefabricated connection assembly 3, see Figure 6 In the present invention, a tension plate 35 is arranged in the upper longitudinal steel bar connection groove 31 and the lower longitudinal steel bar connection groove 32. When the upper longitudinal steel bar connection groove 31 and the lower longitudinal steel bar connection groove 32 are both strip grooves along the length direction of the beam, the upper end of the tension plate 35 is embedded in the strip groove of the upper beam, and the lower end is embedded in the strip groove of the lower beam. With the help of the tension plate 35, the tensile strength between the upper and lower beams is enhanced, and the tensile strength of the entire middle prefabricated connection assembly 3 is enhanced together with the four corner columns.

[0082] Better, such as Figure 8 As shown, the tension plate 35 is an I-shaped plate, and the two ends of the I-shaped plate have recessed slots 36, and the upper and lower recessed slots 36 are clipped into the strip slots of the upper and lower cross beams. During installation, the tension plate 35 is first inserted into the strip slot at the relatively weak space in the middle of the span according to the position of the longitudinal steel bars between two adjacent longitudinal steel bars, and then rotated 90 degrees so that the upper and lower recessed slots 36 are clipped and fixed with the strip slot, and the upper and lower contact surfaces can be welded if necessary.

[0083] More specifically, the middle portion of the I-shape is the same width as or wider than the upper and lower ends, and an inward-recessed slot 36 is formed between the middle portion having the same width or wider than the upper and lower ends.

[0084] Continue to see Figure 1 , Fig. 9 When connecting, corner stacking blocks 5 are arranged between the upper prefabricated column 1 and the middle prefabricated connection assembly 3, and between the lower prefabricated column 2 and the middle prefabricated connection assembly 3. The corner stacking blocks 5 can be made of steel blocks or concrete blocks, and one or more blocks can be arranged according to needs. The corner stacking blocks 5 are installed at the ends of the four corner columns of the middle prefabricated connection assembly 3. The corner stacking blocks 5 can adjust the height of the connection column, and by adding the corner stacking blocks 5, a gap is formed between the upper and lower columns and the middle prefabricated connection assembly 3. The gap is used to accommodate the two ends of the tension plate 35. At the same time, the corner stacking blocks 5 and the positioning and pressure bearing blocks 24 of the lower prefabricated column 2 bear the weight of the upper column before the poured concrete solidifies.

[0085] Combination Figure 1 , Figure 2 , Fig.10 , Fig.12 See also Fig.13The construction method 200 of the prestressed concrete column-column connection system provided in the embodiment of the present invention comprises the following steps:

[0086] S10: The upper prefabricated column components are manufactured in the factory, including welding the lower bottom plate of the upper prefabricated column (i.e., the lower bottom plate of the upper column, the lower bottom plate reinforcement and the longitudinal reinforcement stirrups in the column are tied and welded), the longitudinal reinforcements are extended around, and the extended ends are polished with straight threads, and anti-burst bending reinforcements are set, and the lower bottom plate of the upper column is welded and connected and fixed with the reinforcement in the column, and the upper and lower prestressed reinforcement sleeves are embedded (the prestressed reinforcement sleeves can be slightly adjusted to the left or right to avoid mutual influence with the middle longitudinal reinforcement). After the longitudinal reinforcements are tied and set, the template is set, and the micro-expansion concrete is poured;

[0087] S20: The factory manufactures the lower prefabricated column components, including welding the lower bottom plate of the lower prefabricated column (i.e., the upper top plate of the lower column, the lower bottom plate steel bars are tied and welded with the longitudinal reinforcement stirrups in the column), the longitudinal reinforcements are extended around, straight threads are ground on the extended ends, and anti-burst bending reinforcements are set, and the upper top plate of the lower column is welded and connected and fixed with the steel bars in the column, and two upper and lower prestressed reinforcement through holes are preset. After the longitudinal reinforcements are tied and set, the formwork is set, and the micro-expansion concrete is poured;

[0088] S30: The factory manufactures the middle prefabricated connection components, adopts the box-type steel frame structure, is made of pure high-strength steel, has upper and lower beams and four corner columns, the upper and lower beams have longitudinal steel bar connection grooves, the four corner columns have longitudinal steel bar connection channels and installation holes, and the middle and sides of the box-type steel frame are hollowed out, and the installation holes on the four sides can be drilled and polished after prefabrication;

[0089] S40: Prefabricated tension plate, with recessed slots designed near the edges of both ends. The tension plate is inserted into the longitudinal steel bar connection slot of the prefabricated connection assembly in the middle, and rotated 90° to fix it;

[0090] S50: Assemble the lower prefabricated column and the middle prefabricated connection assembly, hoist the middle prefabricated connection assembly onto the lower prefabricated column, set corner stacking blocks at the four corners of the middle prefabricated connection assembly, extend the longitudinal steel bars into the longitudinal steel bar connection grooves and the longitudinal steel bar connection channels, install the straight threaded sleeves, and tighten them to make the longitudinal steel bars and the middle prefabricated connection assembly completely connected and fixed;

[0091] S60: Assemble the upper prefabricated column and the middle prefabricated connection assembly, hoist the upper prefabricated column and drop it on the middle prefabricated connection assembly, set corner stacking blocks at the four corners of the middle prefabricated connection assembly, extend the longitudinal steel bars and insert them into the longitudinal steel bar connection grooves and the longitudinal steel bar connection channels, install the straight threaded sleeves, and tighten them so that the longitudinal steel bars are completely connected and fixed to the middle prefabricated connection assembly;

[0092] S70: installing the prestressed tendons, passing them through the prestressed tendon through holes of the lower precast column and the prestressed tendon sleeves of the upper precast column, and performing pre-tensioning so that the upper and lower columns are fastened by the prestressed tendons to prevent them from falling off and deviating in the horizontal direction;

[0093] S80: Pour micro-expansive concrete, install the formwork and pour micro-expansive concrete, then perform secondary tensioning and anchoring to form a local hollow reinforcement section at the column node.

[0094] The above-mentioned several specific implementation details should not be interpreted as limiting the scope of the present invention. Certain features described in the context of separate embodiments can also be implemented in a single implementation in combination. On the contrary, the various features described in the context of a single implementation can also be implemented in multiple implementations individually or in any suitable sub-combination.

[0095] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A fully assembled prestressed concrete column-to-column connection system with local reinforcement, characterized in that: include: An upper prefabricated column, wherein an insertion portion extends from the bottom of the upper prefabricated column, wherein the insertion portion is transversely pre-embedded with prestressed steel bar sleeves in two orthogonal directions, wherein the prestressed steel bar sleeves in the two directions are arranged alternately up and down, and longitudinal steel bars extend from the periphery of the column; A lower prefabricated column, wherein a receiving portion is formed on the top of the lower prefabricated column, the receiving portion is consistent in shape with the inserting portion but slightly larger in size, the receiving portion is preset with a prestressed tendon through hole corresponding to the prestressed tendon sleeve, and longitudinal steel bars extend out around the column; A middle prefabricated connection assembly, which is disposed between the upper prefabricated column and the lower prefabricated column, and is respectively connected to the longitudinal steel bars extending from the upper prefabricated column and the lower prefabricated column to form a local hollow reinforcement area; and The middle prefabricated connection assembly comprises a box-shaped steel frame, which is composed of upper and lower cross beams and vertical columns, and the middle and surrounding sides of the box-shaped steel frame are hollowed out; and The upper and lower cross beams of the box-shaped steel frame are respectively pre-set with upper longitudinal steel bar connection grooves and lower longitudinal steel bar connection grooves, the upper longitudinal steel bar connection grooves are used to connect the longitudinal steel bars extending from the upper prefabricated columns, the lower longitudinal steel bar connection grooves are used to connect the longitudinal steel bars extending from the lower prefabricated columns, and the upper longitudinal steel bar connection grooves and the lower longitudinal steel bar connection grooves both pass through the height of the upper and lower cross beams; During assembly, the upper prefabricated column is inserted into the receiving part of the lower prefabricated column through the insertion part through the middle prefabricated connecting assembly, the longitudinal steel bars extending from the upper prefabricated column pass through the upper longitudinal steel bar connecting groove from above and are connected and fixed at the bottom of the upper cross beam, the longitudinal steel bars extending from the lower prefabricated column pass through the lower longitudinal steel bar connecting groove from below and are connected and fixed at the top of the lower cross beam, prestressed steel bars are inserted into the prestressed steel bar through holes and prestressed steel bar sleeves and tensioned and anchored, and concrete is poured into the local hollow reinforcement area to form a local hollow reinforcement section of the column node.

2. The prestressed concrete column-column connection system according to claim 1, characterized in that: The insertion part of the upper prefabricated column is a prism-shaped end head, and anti-burst bending reinforcement is arranged inside the concrete of the end head, distributed in the longitudinal and transverse directions, and at least three reinforcements are arranged in the same direction to increase the overall strength of the end head.

3. The prestressed concrete column-column connection system according to claim 2, characterized in that: The receiving portion of the lower prefabricated column is a prism-shaped cup mouth, and anti-burst bending reinforcement is arranged inside the cup mouth concrete, distributed in the longitudinal and transverse directions, and at least three are arranged in the same direction to increase the overall strength of the cup mouth.

4. The prestressed concrete column-column connection system according to claim 2, characterized in that: An upper column lower base plate is embedded in the bottom of the prism-shaped end, and the upper column lower base plate extends upward to connect the steel bars and the end concrete to bind and fix the anti-burst bending reinforcement, and a positioning groove is left in the upper column lower base plate.

5. The prestressed concrete column-column connection system according to claim 3, characterized in that: The bottom of the prism-shaped cup mouth is embedded with a lower column upper top plate, and the lower column upper top plate extends downward to connect the steel bars and the anti-burst bending reinforcement inside the cup mouth concrete for binding and fixing, and the lower column upper top plate is reserved with a positioning pressure block.

6. The prestressed concrete column-column connection system according to claim 1, characterized in that: The columns of the box-type steel frame are all preset with corner longitudinal steel bar connection holes that pass through from top to bottom, and two upper and lower installation holes are reserved on one of the inner side surfaces of the column. The installation holes are connected to the corner longitudinal steel bar connection holes but do not pass through the column horizontally. The two installation holes are respectively used to connect and fix the longitudinal steel bars extending out of the upper prefabricated column and the lower prefabricated column.

7. The prestressed concrete column-column connection system according to claim 1, characterized in that: The middle prefabricated connection assembly also includes a tension plate, the upper end of which is embedded in the upper longitudinal steel bar connection groove, and the lower end of which is embedded in the lower longitudinal steel bar connection groove.

8. The prestressed concrete column-column connection system according to claim 7, characterized in that: The tension plate is in an I-shape, and both ends of the I-shape are formed as inwardly recessed slots, which are clamped in the upper longitudinal steel bar connection slot and the lower longitudinal steel bar connection slot.

9. The prestressed concrete column-column connection system according to claim 1, characterized in that: The upper longitudinal steel bar connection groove and the lower longitudinal steel bar connection groove are both strip grooves along the length direction of the cross beam.

10. A construction method of the prestressed concrete column-column connection system according to any one of claims 1 to 9, characterized in that: The steps include: S10: The upper prefabricated column components are manufactured in the factory, wherein longitudinal steel bars are extended out from all sides, straight threads are ground on the extended ends, and anti-burst bending bars are provided. The lower base plate of the upper column is welded and connected and fixed with the steel bars in the column, and two upper and lower prestressed steel bar sleeves are pre-buried; S20: The factory manufactures the lower prefabricated column components, in which longitudinal steel bars are extended out on all sides, straight threads are ground on the extended ends, and anti-burst bending bars are set, and the upper top plate of the lower column is welded and fixed to the steel bars in the column, and two upper and lower prestressed steel bar through holes are preset; S30: The factory manufactures the central prefabricated connection components, which adopt the box-type steel frame structure, with upper and lower beams and four corner columns around, the upper and lower beams are provided with longitudinal steel bar connection grooves, and the four corner columns are provided with longitudinal steel bar connection channels; S40: Prefabricated tension plate, with recessed slots designed near the edges of both ends. The tension plate is inserted into the longitudinal steel bar connection slot of the prefabricated connection assembly in the middle, and rotated 90° to fix it; S50: Assemble the lower prefabricated column and the middle prefabricated connection assembly, hoist the middle prefabricated connection assembly onto the lower prefabricated column, set corner stacking blocks at the four corners of the middle prefabricated connection assembly, extend the longitudinal steel bars into the longitudinal steel bar connection grooves and the longitudinal steel bar connection channels, install the straight threaded sleeves, and tighten them to make the longitudinal steel bars and the middle prefabricated connection assembly completely connected and fixed; S60: Assemble the upper prefabricated column and the middle prefabricated connection assembly, hoist the upper prefabricated column and drop it on the middle prefabricated connection assembly, set corner stacking blocks at the four corners of the middle prefabricated connection assembly, extend the longitudinal steel bars and insert them into the longitudinal steel bar connection grooves and the longitudinal steel bar connection channels, install the straight threaded sleeves, and tighten them so that the longitudinal steel bars are completely connected and fixed to the middle prefabricated connection assembly; S70: installing the prestressed tendons, passing them through the prestressed tendon through holes of the lower precast column and the prestressed tendon sleeves of the upper precast column, and performing prestressing; S80: Pour micro-expansive concrete, install the formwork and pour micro-expansive concrete, then perform secondary tensioning and anchoring to form a local hollow reinforcement section at the column node.

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