Variable cross-section prestressed concrete beam and beam-column connection node structure
By setting a prestressing application area and arranging prestressing tendons in the lower part of the precast beam body, combined with dry connection, the problems of exposed tendons in precast components and dense reinforcement in joint areas in assembled prestressed concrete structures are solved, realizing an efficient and environmentally friendly construction method that is suitable for large-span structures.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-20
- Publication Date
- 2026-04-07
AI Technical Summary
Precast prestressed concrete structures suffer from problems such as exposed reinforcement in precast components, dense reinforcement in joint areas, and excessive wet concrete work on site, resulting in long construction cycles, high costs, and serious environmental pollution.
Variable cross-section prestressed concrete beams are used. A prestressing application area is set in the lower part of the precast beam body, and prestressing tendons are arranged in it. The beam end connectors are used to connect to the precast columns, avoiding direct connection with the precast columns, reducing on-site wet work, and adopting a dry connection method.
It improves construction efficiency, reduces construction costs and environmental pollution, is suitable for large-span structures, has good economic efficiency and space utilization, and avoids the problems of exposed reinforcement in precast components and dense reinforcement in joint areas.
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Figure CN224092697U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application relates to the technical field of assembled frame structures, in particular to a variable cross-section prestressed concrete beam and a beam-column connecting joint structure. BACKGROUND
[0002] An assembled concrete frame structure adopts a form of a prefabricated frame column and a composite beam, and realizes rigid connection through post-poured joints, but this connection mode has problems such as the emergence of a reinforcing bar of a prefabricated component, the denseness of reinforcing bars in a joint area, the wet concrete work on site, the need for temporary support and formwork, and the like, and although the overall construction cost is relatively low, the on-site operation amount is large and the construction period is long.
[0003] A prestressed concrete structure is subjected to prestressed stress before an external load is applied, so as to offset tensile stress caused by the external load, and alleviate cracking caused by the insufficient tensile stiffness of concrete. Especially in a large-span structure, prestressed concrete can reduce the sectional area of a beam, and has good economy, aesthetics and space utilization.
[0004] However, the current assembled prestressed concrete structure mainly adopts a groove connection, and has problems such as the emergence of a reinforcing bar of a prefabricated component, the denseness of reinforcing bars in a joint area, and the wet concrete work on site. CONTENT OF THE INVENTION
[0005] The purpose of the embodiments of the application is to provide a variable cross-section prestressed concrete beam and a beam-column connecting joint structure, so as to solve the problems such as the emergence of a reinforcing bar of a prefabricated component, the denseness of reinforcing bars in a joint area, and the wet concrete work on site in the current assembled prestressed concrete structure mainly adopting a groove connection.
[0006] To solve the above technical problems, the embodiments of the application provide the following technical solutions:
[0007] The first aspect of the application provides a prestressed concrete beam, which comprises: a prefabricated beam body, two beam ends in the extension direction of the prefabricated beam body are respectively embedded with beam end connectors, which are used for screwing and fixing with column side connectors of a joint area of a prefabricated column body, a prestressed stress application area is arranged on the lower part of the prefabricated beam body in symmetry with the midpoint of the prefabricated beam body in a first direction, and a plurality of prestressed reinforcing bars are arranged in the prestressed stress application area and are distributed in a second direction.
[0008] The prestressed stress application area is arranged in a range between two inflection points of the prefabricated beam body in the first direction.
[0009] The first direction is the extension direction of the prefabricated beam body, and the second direction is the width direction of the prefabricated beam body.
[0010] In some implementation forms of the first aspect of the application, a distance between an end of the pre-stress application region in the first direction and the corresponding beam end edge is not less than 1.5 times of an effective height of the precast beam body.
[0011] In some implementation forms of the first aspect of the application,
[0012] Ends of the plurality of pre-stressed tendons are provided with anchoring end sealing;
[0013] The anchoring end sealing is formed by fine stone concrete or low shrinkage mortar.
[0014] In some implementation forms of the first aspect of the application,
[0015] The precast beam body is provided with a plurality of longitudinal steel bars and a plurality of stirrups, and the two beam ends of the precast beam body each have a stirrup reinforced region;
[0016] The setting range of the stirrup reinforced region in the first direction is not less than 1 / 2 of the beam height of the precast beam body.
[0017] In some implementation forms of the first aspect of the application,
[0018] The part of the beam end connector embedded in the precast beam body is an embedded part, and the part of the beam end connector exposed outside the precast beam body is a connecting part;
[0019] The beam end connector comprises:
[0020] Two first connecting plates oppositely arranged in a third direction;
[0021] A second connecting plate connected between the two first connecting plates and perpendicular to the first connecting plates;
[0022] The second connecting plate of the connecting part is provided with a plurality of first connecting holes for connecting threaded locking members to lock and fix with the column side connector of the precast column body;
[0023] The third direction is a height direction of the precast beam body.
[0024] In some implementation forms of the first aspect of the application, opposite surfaces of the two first connecting plates of the embedded part are respectively welded and fixed with corresponding longitudinal steel bars.
[0025] In some implementation forms of the first aspect of the application, the second connecting plate of the embedded part is anchored in the precast beam body by a plurality of studs.
[0026] In some alternative embodiments of the first aspect of the application, the second connecting plate of the embedded part is provided with a through hole along the second direction.
[0027] The second aspect of the application provides a beam-column connection node structure, which comprises the prestressed concrete beam described above.
[0028] The prefabricated column body is provided with a column side connecting piece in the node area, which is used for screwing and fixing with the beam end connecting piece of the prefabricated beam body of the prestressed concrete beam.
[0029] In some alternative embodiments of the second aspect of the application,
[0030] Further comprising:
[0031] The filling part comprises:
[0032] The first filling part is arranged in a first filling gap between the beam end of the prefabricated beam body and the node area, and wraps the beam end connecting piece and the column side connecting piece.
[0033] The second filling part is arranged in a second filling gap between the prestress applying area of the prefabricated beam body and the node area.
[0034] The outer wall of the filling part is flush with the outer wall of the prefabricated beam body.
[0035] Compared with the prior art, the variable cross-section prestressed concrete beam and the beam-column connection node structure provided by the application can reduce the cross-sectional area of the prestressed concrete beam by arranging the prestress applying area and the plurality of prestressed tendons, which is suitable for large-span structures and has good economy, aesthetics and space utilization. In the technical scheme adopted by the application, the beam end connecting piece of the prefabricated beam body is connected with the prefabricated column body, and the setting range of the prestress applying area is located between two inflection points, without being directly connected with the prefabricated column body. This can distinguish from the groove connection connection mode used in the current assembly prestressed structure, which can avoid the problems of the prefabricated component out of the tendon, the dense reinforcement in the node area, and the multiple wet concrete operations on site, and can improve the construction efficiency, save energy and reduce emissions, and is beneficial to environmental protection. BRIEF DESCRIPTION OF DRAWINGS
[0036] The above and other objects, features and advantages of the example embodiments of the application will be readily understood through reading the detailed description below, with reference to the accompanying drawings. In the drawings, several embodiments of the application are shown by way of example and not limitation, in which the same or corresponding reference numbers indicate the same or corresponding parts, in which:
[0037] Figure 1The structural schematic view of the variable cross-section prestressed concrete beam is shown schematically.
[0038] Figure 2 The structural schematic view of the variable cross-section prestressed concrete beam is shown schematically Figure 1 The sectional structure schematic view of the A-A section is shown schematically.
[0039] Figure 3 The sectional structure schematic view of the B-B section is shown schematically Figure 1 The sectional structure schematic view of the B-B section is shown schematically.
[0040] Figure 4 The sectional structure schematic view of the C-C section is shown schematically Figure 1 The sectional structure schematic view of the C-C section is shown schematically.
[0041] Figure 5 The structural schematic view of the variable cross-section prestressed concrete beam from another angle is shown schematically.
[0042] Figure 6 The structural schematic view of the beam-column connecting joint structure is shown schematically.
[0043] BRIEF DESCRIPTION OF DRAWINGS
[0044] 1, prefabricated beam body; 11, prestressed tendon; 12, anchor end; 13, longitudinal steel bar; 14a, first stirrup; 14b, second stirrup; 1a, prestress application area; 1b, stirrup reinforcement area;
[0045] 2, beam end connecting piece; 21, first connecting plate; 22, second connecting plate; 221, first connecting hole; 222, through hole; 23, stud;
[0046] 3, prefabricated column body;
[0047] 4, column side connecting piece;
[0048] 5, threaded locking piece;
[0049] 61, first filling part; 62, second filling part;
[0050] a, first direction; b, second direction; c, third direction. DETAILED DESCRIPTION
[0051] Exemplary embodiments of the present disclosure will be described more fully hereinafter with reference to the accompanying drawings; however, they are not limited to the embodiments set forth herein but can be implemented in various forms. The present disclosure will be described herein with reference to exemplary embodiments. It is to be understood that the present disclosure is not limited to a particular embodiment, and as such can vary. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the present disclosure. It must be noted that, as used herein, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. The term "comprises" means "includes but not limited to". The term "comprising" means "including, but not limited to". The term "consisting essentially of" means "including, but not limited to, and any elements which do not materially affect the basic and novel characteristics of the compositions and methods". The term "consisting of" means "including, and limited to".
[0052] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the present application shall have the usual meanings understood by those skilled in the art to which the present application belongs.
[0053] Embodiment one
[0054] Reference drawings Figure 1 - Appendix Figure 5 The embodiment one of the utility model provides a variable cross-section prestressed concrete beam, the variable cross-section prestressed concrete beam includes: the prefabricated beam body 1, two beam ends in the extension direction of the prefabricated beam body 1 are embedded with beam end connecting piece 2 respectively, are used for with the column side connecting piece 4 of the node area of the prefabricated column body 3 screw joint fixed, the lower part of the prefabricated beam body 1 is provided with the prestress application area 1a about the midpoint of the prefabricated beam body 1 in the first direction a, the prestress application area 1a is provided with a plurality of prestressed tendons 11 spaced distribution along the second direction b in, the prestress application area 1a is set in the first direction a and the range is located between the two reverse bending points of the prefabricated beam body 1, wherein the first direction a is the extension direction of the prefabricated beam body 1, and the second direction b is the width direction of the prefabricated beam body 1.
[0055] Specifically, the two beam ends of the prefabricated beam body 1 of the variable cross-section prestressed concrete beam provided by the embodiment are embedded with beam end connecting pieces 2 respectively, which are used for screw joint fixing with the column side connecting pieces 4 embedded in the node area of the prefabricated column body 3. The screw joint fixing here can be achieved by using threaded locking pieces 5 such as bolts and nuts to achieve connection and fixing. This can realize dry connection of beam and column, without the need for temporary support, formwork and corbel setting, and without the need for a large number of wet operations, which can save construction time and cost, and is more economical and environmentally friendly. The variable cross-section prefabricated beam body 1 provided by the embodiment is a prestressed concrete beam. In a large-span structure, prestressed concrete can reduce the cross-sectional area of the prefabricated beam body 1, has good economy, aesthetics and space utilization.
[0056] In order to solve the problems of the current assembly type prestressed concrete structure mainly adopting groove connection, the precast component out of the muscle, the node area steel dense, the site concrete wet operation is more and other problems, the utility model takes the technical scheme, the prestress application area 1a is arranged in the lower part of the precast beam body 1, the prestress application area 1a is used to arrange prestressed tendon 11, the section of the part of the precast beam body 1 corresponding to the prestress application area 1a is greater than the rest, thereby forming the variable cross-section beam structure with the change of the cross-section size, the prestress application area 1a is arranged about the midpoint of the precast beam body 1 in the first direction a, which can ensure that the prestress applied by the prestressed tendon 11 is more uniform in the precast beam body 1, and help to improve the carrying capacity and crack resistance of the precast beam body 1, wherein the first direction a refers to the extension direction of the precast beam body 1, that is, the length direction, and further, the setting range of the prestress application area 1a in the first direction a is located between the two reverse bending points of the precast beam body 1, the reverse bending point here refers to the bending area of the precast beam body 1 after the prestress is applied, and is one of the key parts of the prestress application, which acts on the curvature formed in the precast beam body 1 to resist bending, thereby increasing the stiffness and carrying capacity of the structure, and the prestress application area 1a is arranged between the two reverse bending points, which can make the pre-stress stress generated by the prestressed tendon 11 in this area effectively resist the tensile stress generated in the precast beam body 1 during the stress process, thereby significantly improving the bending carrying capacity of the precast beam body 1, wherein the tension of the prestressed tendon 11 can adopt the pretension method, or also can adopt the post-tensioning method.
[0057] According to the above, by arranging the prestress application area 1a and the plurality of prestressed tendons 11, the cross-sectional area of the variable cross-section prestressed concrete beam can be reduced, which is suitable for large-span structures and has good economy, aesthetics and space utilization rate, and in the technical scheme of the utility model, only the beam end connector 2 of the precast beam body 1 is connected with the precast column body 3, and the setting range of the prestress application area 1a is located between the two reverse bending points, which is not directly connected with the precast column body 3, which can be distinguished from the current groove connection connection mode of the assembly type prestressed concrete structure, that is, the problems of the precast component out of the muscle, the node area steel dense, the site concrete wet operation is more and other problems can be avoided, which can improve the construction efficiency, save energy and reduce emissions, and is beneficial to environmental protection.
[0058] The plurality of prestressed tendons 11 of the prestress application area 1a are distributed along the second direction b, and the second direction b refers to the width direction of the precast beam body 1, the spacing between the adjacent prestressed tendons 11 in the direction is equal, and the number of the prestressed tendons 11 and the spacing between the adjacent prestressed tendons 11 can be calculated and set according to the actual situation.
[0059] Specifically, referring to the drawings Figure 1 and the drawingsFigure 5 The end of the plurality of prestressed tendons 11 is provided with an anchoring end 12, which is tightly wrapped around the end of the prestressed tendon 11 by filling and curing of fine stone concrete or low shrinkage mortar, to form effective anchoring, which can prevent the loosening or falling off of the prestressed tendon 11, thereby improving the stability and safety of the overall structure, and the setting of the anchoring end 12 can also effectively prevent the loss of prestress of the prestressed tendon 11 due to long-term stress or environmental factors; The fine stone concrete and low shrinkage mortar have high compactness and impermeability, which can effectively resist the erosion of environmental factors such as water and air, thereby protecting the prestressed tendon 11 from corrosion and damage.
[0060] Further, with reference to the accompanying drawings Figure 1 In specific implementation, the prestress application area 1a is arranged in the first direction a with a range not less than 1.5 times of the effective height h0 of the precast beam body 1.
[0061] Specifically, in order to further enhance the structural performance of the variable cross-section prestressed concrete beam, the technical scheme adopted by the utility model is that the distance between the end of the prestress application area 1a in the first direction a and the corresponding beam end edge between the two inflection points of the precast beam body 1 is not less than 1.5 times of the effective height h0 of the precast beam body 1, and the effective height h0 here refers to the distance between the longitudinal tensile steel force point of the precast beam body 1 and the compression edge of the cross section. Increasing the setting range of the prestress application area 1a between the two inflection points can form a larger prestress application area 1a in the precast beam body 1, thereby more effectively resisting the bending moment generated by external load.
[0062] Further, with reference to the accompanying drawings Figure 1 and the accompanying drawings Figure 4 , the accompanying drawings Figure 5 In specific implementation, the precast beam body 1 is provided with a plurality of longitudinal steel bars 13 and a plurality of stirrups, and the two beam ends of the precast beam body 1 each have a stirrup reinforced area 1b; wherein the setting range of the stirrup reinforced area 1b in the first direction a is not less than 1 / 2 of the beam height h b of the precast beam body 1.
[0063] Specifically, the technical scheme adopted by the utility model, longitudinal reinforcement 13 is the main force reinforcement of prefabricated beam body 1, the arrangement direction of longitudinal reinforcement 13 is same direction with the extension direction of prefabricated beam body 1, mainly bears the tension, the quantity and diameter of longitudinal reinforcement 13 arranged in prefabricated beam body 1 need to be determined according to the carrying capacity and span of prefabricated beam body 1, and meet the design requirement, to ensure that prefabricated beam body 1 does not break down when being stressed, stirrup is the transverse reinforcement in prefabricated beam body 1, is arranged along the circumference of prefabricated beam body 1, is used to bear the shear force and constrain the lateral deformation of longitudinal reinforcement 13, the setting of stirrup can also enhance the torsional carrying capacity of prefabricated beam body 1, improve the stability of prefabricated beam body 1, longitudinal reinforcement 13 and stirrup jointly constitute the reinforcement cage, jointly bear the load of prefabricated beam body 1, wherein the stirrup of prefabricated beam body 1 includes first stirrup 14a and second stirrup 14b, first stirrup 14a is tied to the outside of longitudinal reinforcement 13, and second stirrup 14b corresponds to prestress application area 1a and is tied to the outside of longitudinal reinforcement 13 and prestressed reinforcement 11.
[0064] The two ends of prefabricated beam body 1 are the parts that are relatively complex in stress and prone to damage, by setting the setting range of stirrup reinforcement zone 1b in the first direction a is not less than 1 / 2 of the beam height h of prefabricated beam body 1, the transverse expansion of the compression zone concrete can be constrained, and the crushing of the concrete under the action of pressure can be prevented, so that the overall stability and carrying capacity of prefabricated beam body 1 are improved, wherein the embedded part of beam end connecting piece 2 is located in stirrup reinforcement zone 1b of prefabricated beam body 1. b
[0065] Further, referring to the accompanying drawings Figure 1 , the drawings Figure 5 and the drawings Figure 6 , in the specific implementation, the part of the beam end connecting piece 2 embedded in the prefabricated beam body 1 is the embedded part, and the part of the beam end connecting piece 2 exposed outside the prefabricated beam body 1 is the connecting part, the beam end connecting piece 2 comprises two first connecting plates 21, which are oppositely arranged in the third direction c, and a second connecting plate 22 connected between the two first connecting plates 21 and perpendicular to the first connecting plates 21, the second connecting plate 22 of the connecting part is provided with a plurality of first connecting holes 221 for connecting threaded locking members 5 to lock and fix with the column side connecting piece 4 of the prefabricated column body 3.
[0066] Specifically, in order to achieve the screw-on fixing of the beam end connector 2 of the precast beam body 1 to the precast column body 3, the technical solution adopted in this utility model divides the beam end connector 2 into a pre-embedded part and a connecting part. The pre-embedded part is embedded inside the beam end of the precast beam body 1, while the connecting part is exposed at the beam end of the precast beam body 1 and is used to connect with the column side connector 4. The structure of the beam end connector 2 specifically includes: two first connecting plates 21 and a second connecting plate 22 connected between the two first connecting plates 21. The two are identical in shape and size and are set opposite each other in the third direction c, which refers to the height direction of the precast beam body 1. The second connecting plate 22 is vertically connected between the two first connecting plates 21, that is, the beam end connector 2 forms an approximately "I" shaped structure. The second connecting plate 22 corresponding to the connecting part has multiple first connecting holes 221 for connecting threaded locking parts 5 to lock and fix with the column side connector 4 of the precast column body 3. The threaded locking parts 5 may include, but are not limited to, bolts, nuts, etc.
[0067] The specific structure of the column side connector 4 of the precast column body 3 is not specifically limited here. Its structure is intended to include a third connecting plate that corresponds to and fits the second connecting plate 22. The third connecting plate is provided with a plurality of second connecting holes that correspond one-to-one with and are adapted to the plurality of first connecting holes 221 of the second connecting plate 22, so that the corresponding first connecting holes 221 and second connecting holes can be connected to threaded locking parts 5, thereby realizing the locking and fixing of the beam end connector 2 and the column side connector 4.
[0068] Further, see attached document. Figure 2 In specific implementation, the opposing surfaces of the two first connecting plates 21 of the pre-embedded part are respectively welded and fixed to the corresponding longitudinal steel bars 13.
[0069] Specifically, in order to improve the connection strength of the beam end connector 2, the technical solution adopted by this utility model is to firmly connect the two first connecting plates 21 corresponding to the pre-embedded part with the longitudinal stirrups by welding, so as to improve the strength of the connection part. Specifically, double-sided lap welding can be adopted, and the welding distance is not less than 5 times the diameter of the steel bar.
[0070] Further, see attached document. Figure 1 and attached Figure 2 In specific implementation, the second connecting plate 22 of the pre-embedded part is anchored to the precast beam body 1 by a plurality of studs 23.
[0071] Specifically, in order to more effectively fix the embedded part of the beam end connector 2 in the prefabricated beam body 1, the technical scheme adopted by the utility model adopts a bolt 23 as a connecting piece, and the second connecting plate 22 corresponding to the embedded part is anchored in the prefabricated beam body 1 through a plurality of bolts 23, which can have higher connection strength and better stability; the number of bolts 23 can be four, and they are distributed in an array; the uniform distribution of the bolts 23 can effectively disperse the stress at the connection site and avoid connection failure caused by local stress concentration.
[0072] Wherein, refer to the accompanying drawings Figure 1 In specific implementation, the second connecting plate 22 corresponding to the embedded part is provided with a through hole 222 along the second direction b, and the through hole 222 can be located at the arrangement center of the plurality of bolts 23; by providing the through hole 222, the embedded part of the beam end connector 2 can be fully and closely connected with the concrete.
[0073] The production process of the variable cross-section prestressed concrete beam will be described below by taking the pretensioning method of the prestressed tendon 11 as an example; the longitudinal reinforcement 13 needs to be passed through a sufficient amount of first stirrup 14a and second stirrup 14b, and then the two ends of the longitudinal reinforcement 13 are double-sided lap-welded with the first connecting plate 21 of the beam end connector 2; after welding, the first stirrup 14a and the second stirrup 14b are moved to the corresponding positions, and the binding of the reinforcement cage is completed; the reinforcement cage is supported on the corresponding position above the prestressed tendon 11; after the prestressed tendon 11 passes through the second stirrup 14b, tensioning is performed; the mold is supported and the concrete is poured; when the concrete strength reaches 75%, the bottom formwork is removed first, then the prestressed tendon 11 is cut off, and the anchoring end 12 is anchored with fine stone concrete or low shrinkage mortar.
[0074] Embodiment two
[0075] Reference to the accompanying drawings Figure 6 The embodiment two of the utility model proposes a beam-column connection joint structure, which comprises the above-mentioned variable cross-section prestressed concrete beam and a prefabricated column body 3; the joint area of the prefabricated column body 3 is provided with a column side connecting piece 4 for screwing and fixing with the beam end connector 2 of the prefabricated beam body 1 of the prestressed concrete beam.
[0076] Specifically, the technical scheme adopted by the utility model comprises the above-mentioned variable cross-section prestressed concrete beam and the prefabricated column body 3; the beam end of the variable cross-section prestressed concrete beam is spliced with the joint area of the prefabricated column body 3, and is screw-fixed through the beam end connector 2 and the column side connecting piece 4, realizing dry connection, without the need for setting a temporary support structure, without the need for a large amount of wet work such as on-site pouring of concrete, thereby saving construction time and cost and improving construction efficiency.
[0077] Further, reference to the accompanying drawingsFigure 6 In the embodiment, the beam-column connecting joint structure further comprises a filling part, which comprises a first filling part 61 arranged in a first filling gap between the beam end of the prefabricated beam body 1 and the node area and wrapping the beam end connector 2 and the column side connector 4, and a second filling part 62 arranged in a second filling gap between the prestress application area 1a of the prefabricated beam body 1 and the node area; and the outer wall of the filling part is flush with the outer wall of the prefabricated beam body 1.
[0078] Specifically, in the technical scheme, after the beam end connector 2 and the column side connector 4 are connected, the two ends of the prefabricated beam body 1 and the node area of the prefabricated column body 3 have a first filling gap, and after the beam end connector 2 and the column side connector 4 are reliably screwed, the first filling gap is filled with filling material, which can be fine stone concrete, to form the first filling part 61, so as to enhance the rigidity and stability of the connection between the beam end connector 2 and the column side connector 4, avoid loosening and damage of the connection, and make the beam end connector 2 and the column side connector 4 not exposed by wrapping the first filling part 61. The filling material has good corrosion resistance and oxidation resistance, so that corrosion and fireproofing treatment is not required, and the construction cost can be further reduced. In order to ensure the appearance, the second filling gap between the prestress application area 1a of the prefabricated beam body 1 and the node area is filled with light filling material to form the second filling part 62. The filling part is arranged so that the outer wall of the filling part is flush with the outer wall of the prefabricated beam body 1, forming a good appearance.
[0079] When the prefabricated beam body 1 and the prefabricated column body 3 are connected, the prefabricated beam body 1 is hoisted to the corresponding position, the beam end connector 2 and the column side connector 4 are initially screwed by bolts during connection, the flanges of the beam end connector 2 and the column side connector 4 are then welded, the bolts are finally tightened, and the stirrups of the section are then arranged at the correct position. After the beam end connector 2 and the column side connector 4 are connected, fine stone concrete is injected into the first filling gap, and light filling material is finally filled into the second filling gap. The light filling material needs to meet the fireproofing requirement and needs to be reliably connected with concrete, and a special adhesive can be used for connection.
[0080] It should be noted that in the description of the present application, the terms "upper", "lower" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application; the terms "connection", "installation", "fixation" and the like should be understood in a broad sense, for example, "connection" can be fixed connection, can also be detachable connection, or integral connection; can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0081] In the description of the present application, the terms "one embodiment", "some embodiments", "a specific embodiment" and the like mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0082] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.
Claims
1. A variable cross-section prestressed concrete beam, characterized in that, include: The precast beam body has two beam ends embedded with beam end connectors in its extension direction, which are used to be screwed and fixed to the column side connectors in the node area of the precast column body. The precast beam body is provided with several longitudinal steel bars and several stirrups. The two beam ends of the precast beam body have stirrup reinforcement areas. The lower part of the precast beam body is provided with a prestressing application area symmetrically arranged about the midpoint of the precast beam body in a first direction. The prestressing application area is provided with a plurality of prestressing tendons spaced apart along a second direction, and the ends of the plurality of prestressing tendons are provided with sealing anchor ends. The prestressing application area is set in the first direction and its range is located between the two inflection points of the precast beam body; Wherein, the first direction is the extension direction of the precast beam body, and the second direction is the width direction of the precast beam body.
2. The variable cross-section prestressed concrete beam according to claim 1, characterized in that, The distance between the end of the prestressed area in the first direction and the corresponding edge of the beam end is not less than 1.5 times the effective height of the precast beam body.
3. The variable cross-section prestressed concrete beam according to claim 1 or 2, characterized in that, The anchoring end is formed by sealing with fine aggregate concrete or low-shrinkage mortar.
4. The variable cross-section prestressed concrete beam according to claim 1, characterized in that, The range of the stirrup reinforcement zone in the first direction is not less than 1 / 2 of the beam height of the precast beam body.
5. The variable cross-section prestressed concrete beam according to claim 4, characterized in that, The portion of the beam end connector pre-embedded in the precast beam body is the pre-embedded portion, and the portion of the beam end connector exposed outside the precast beam body is the connecting portion; The beam end connector includes: Two first connecting plates are positioned opposite each other on a third-party upward direction; The second connecting plate is connected between the two first connecting plates and is perpendicular to the first connecting plates; The second connecting plate of the connecting part is provided with a plurality of first connecting holes for connecting threaded locking parts to lock and fix with the column side connecting parts of the precast column body; Wherein, the third direction refers to the height direction of the precast beam body.
6. The variable cross-section prestressed concrete beam according to claim 5, characterized in that, The opposing surfaces of the two first connecting plates of the pre-embedded portion are respectively welded and fixed to the corresponding longitudinal reinforcing bars.
7. The variable cross-section prestressed concrete beam according to claim 5 or 6, characterized in that, The second connecting plate of the pre-embedded part is anchored to the precast beam body by a plurality of studs.
8. The variable cross-section prestressed concrete beam according to claim 5, characterized in that, The second connecting plate of the pre-embedded part has a through hole along the second direction.
9. A beam-column connection joint structure, characterized in that, include: Variable cross-section prestressed concrete beam as described in any one of claims 1-8; The precast column body has a column side connector in the node area for screwing and fixing to the beam end connector of the precast beam body of the prestressed concrete beam.
10. The beam-column connection node structure according to claim 9, characterized in that, Also includes: The filling portion includes: The first filling part is provided in the first filling gap between the beam end and the node area of the precast beam body, and wraps the beam end connector and the column side connector. The second filling part is a second filling gap provided between the prestressing application area of the precast beam body and the node area; The outer wall of the filling part is flush with the outer wall of the precast beam body.