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

Abstract

The present invention relates to a partially reinforced fully assembled prestressed concrete beam-column structure system and a construction method thereof. The beam-column structure system comprises: a precast beam, wherein the beam top longitudinal reinforcement and the beam bottom longitudinal reinforcement of the precast beam are both extended, a beam body prestressed sleeve is pre-embedded in the negative bending moment zone of the upper part of the beam body, a prestressed tendon is penetrated in the beam body prestressed sleeve, and the precast beam is indented at the lower part of the beam end compared with the beam end to form a first indentation zone; a precast column, wherein the column body of the precast column has connecting steel bars extending out corresponding to the beam top longitudinal reinforcement of the precast beam, a column body prestressed sleeve is pre-embedded corresponding to the beam body prestressed sleeve, a prestressed tendon is penetrated in the column body prestressed sleeve, and a corbel plate is extended out of the precast column corresponding to the first indentation zone. The beam-column structure system provided by the present invention can effectively improve the bending strength of the bending zone of the beam-column connection node, effectively improve the bearing capacity of the beam and column, and at the same time, the component can significantly reduce the deformation and deflection of the beam and column under load, reduce the formation of cracks, and thus improve the durability of the structure.

Description

Technical Field

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

[0002] The booming construction industry has promoted the growth of the national economy. Faced with the rising price of laborers and the gradual improvement of people's awareness of environmental protection and energy conservation, the construction industry is facing increasing competitive pressure. In order to improve core competitiveness, prefabricated and assembled buildings came into being. Prefabricated and assembled buildings are buildings that meet the predetermined functional requirements after the main components are manufactured in the factory and then transported to the site and quickly installed. They have the characteristics of building industrialization.

[0003] Compared with the traditional construction method that mainly relies on on-site construction, the advanced features of prefabrication and assembly technology are mainly reflected in: factory production of components, mechanized on-site construction, and scientific organization and management. Therefore, it can effectively reduce construction waste, reduce the adverse impact of construction on the environment, save labor, and shorten the construction period.

[0004] However, the current prefabricated beam-column structure has problems such as low assembly rate, insufficient bearing capacity of assembled components and stress concentration, poor bending performance of beam-column nodes, and poor integrity of prefabricated layers and post-cast composite layers.

[0005] Based on the above problems, it is urgent to propose a new type of prefabricated beam-column structure and its construction method to effectively solve the problems existing in the project and meet the needs of engineering construction. Summary of the invention

[0006] In view of the shortcomings of the prior art, the main purpose of the present invention is to provide a fully assembled prestressed concrete beam-column structural system with local reinforcement and a construction method thereof, so as to solve the problems of excessive concentrated stress in the existing assembled beam-column connection nodes, which leads to poor structural durability, seismic performance and low structural assembly rate.

[0007] The technical solution of the present invention is as follows:

[0008] The present invention first provides a partially reinforced fully assembled prestressed concrete beam-column structural system, comprising:

[0009] A precast beam, wherein the longitudinal bars at the top and bottom of the beam are extended, a prestressed sleeve for the beam body is embedded in the negative bending moment zone at the upper part of the beam body, prestressed bars are inserted into the prestressed sleeve for the beam body, and a tensioning groove is preset at a predetermined position of the beam body, and the precast beam is indented at the lower part of the beam end compared to the beam end to form a first indented zone;

[0010] A prefabricated column, wherein a connecting steel bar extends out of the column body of the prefabricated column corresponding to the longitudinal bars on the top of the prefabricated beam, a column body prestressed sleeve is pre-embedded corresponding to the prestressed sleeve of the beam body, a prestressed steel bar is penetrated in the prestressed sleeve of the column body, and a corbel plate extends out of the prefabricated column corresponding to the first indented area, and the longitudinal bars on the bottom of the corbel plate extend out to correspond to the longitudinal bars on the bottom of the prefabricated beam;

[0011] During assembly, the beam end of the precast beam is overlapped and supported on the corbel plate, a first gap is formed between the beam end and the column body of the precast column, the corbel plate extends into the first indentation area and forms a second gap at the plate end, and the prestressed sleeve of the beam body is butt-connected with the prestressed sleeve of the column body, the prestressed tendons are tensioned and anchored in the tensioning groove, and micro-expansive concrete is post-cast in the first gap and the second gap to form a local hollow reinforcement section of the beam-column node.

[0012] In some preferred embodiments, the tensioning groove is arranged at 1 / 3-1 / 4L away from the end of the beam, where L is the length of the beam.

[0013] In some preferred embodiments, the top longitudinal reinforcement of the precast beam and the connecting reinforcement of the precast column, as well as the bottom longitudinal reinforcement of the precast beam and the bottom longitudinal reinforcement of the corbel plate are all connected by connecting sleeves;

[0014] And / or, the beam body prestressed sleeve and the column body prestressed sleeve are both foldable sleeves, and the parts extending out of the beam end and the column body can be contracted and extended.

[0015] In some preferred embodiments, the outermost stirrups at the ends of the precast beams and the outermost stirrups at the ends of the corbels extend out of the cross section without being interrupted, and are tied to the top longitudinal reinforcement and the bottom longitudinal reinforcement of the beams after the beams and columns are overlapped.

[0016] In some preferred embodiments, the precast beam is provided with a hollow support portion in the middle of the beam end, the hollow support portion forms a second setback area that is retracted relative to the beam end, and the second setback area is connected to the second gap, so that the first gap, the second setback area and the second gap form a casting channel that runs through from top to bottom.

[0017] In some preferred embodiments, the hollow support portion is composed of support edges on both sides of the cross section of the prefabricated beam, and the two support edges are opposed to each other to form the second indentation area.

[0018] In some preferred embodiments, positioning blocks / positioning grooves are provided at the bottom of the two supporting edges, and positioning grooves / positioning blocks are correspondingly provided at the top of the corbel plate.

[0019] In some preferred embodiments, the second setback area is shallower than the first setback area, so that the first gap, the second setback area and the second gap form a stepped casting channel.

[0020] In some preferred embodiments, at least one side of the precast beam is provided with a floor connecting plate extending outward, and butt steel bars and butt ballast mouths connected to the floor are reserved on the floor connecting plate, and micro-expansive concrete is later poured to form a local overlapping reinforcement post-cast belt on the beam edge.

[0021] The present invention also provides a construction method according to the above beam-column structural system, comprising the following steps:

[0022] S10: The prefabricated beam components are manufactured in the factory. The prestressed sleeves and prestressed tendons of the beam body are embedded in the negative bending moment area of ​​the upper part of the beam body. The beam body and the longitudinal tendons of the beam are extended out of the cross section of the beam end. At least one side of the beam body is provided with a floor slab connection plate. The floor slab connection plate is reserved for the butt reinforcement and butt slag connection with the floor slab. The beam stirrups are tied. The outermost stirrups of the beam end are extended out of the cross section but not interrupted.

[0023] S20: Prefabricated column components are manufactured in the factory. Connecting steel bars are set at the corresponding connection height with the prefabricated beams, and prestressed sleeves and prestressed bars are embedded in the column body. The longitudinal bars at the bottom of the corbel plate extend out of the plate end section. The column stirrups and plate stirrups are tied, and the outermost stirrups at the plate end extend out of the section but are not interrupted.

[0024] S30: Butt and connect the beam-column structure, overlap the beam end on the corbel plate, and then connect the longitudinal reinforcement and prestressed sleeve through the connecting sleeve;

[0025] S40: Connect the prestressed tendons of beams and columns and anchor them at one end, and pre-tension them in the tensioning groove at the other end;

[0026] S50: Install the formwork and pour the micro-expansion concrete, and then perform secondary tensioning to form a local hollow reinforcement section at the beam-column node;

[0027] S60: Connect beams and slabs, butt the ballast of beams and slabs, connect the butt steel bars, set up the formwork, and pour micro-expansive concrete to form a local overlapping reinforcement post-casting belt on the beam edge.

[0028] The beneficial effects of the present invention compared to the prior art are as follows: the present invention proposes a partially reinforced fully assembled prestressed concrete beam-column structural system, which can effectively improve the bending strength of the bending zone of the beam-column connection node, and effectively improve the bearing capacity of the beam-column. This enables the structure to support a larger load, or be designed into a smaller component under the same load. At the same time, the component can significantly reduce the deformation and deflection of the beam and column under load, reduce the formation of cracks, and thus improve the durability of the structure. Specifically, at least one or more of the following beneficial effects can be achieved:

[0029] The present invention designs longitudinal stress-bearing steel bars and prestressed bars extending out of the cross-section in the negative bending moment area of ​​the precast beam. The prestressed bars serve as reinforcing bars for the longitudinal stress-bearing steel bars in the negative bending moment area, make up for the insufficient tensile performance of the longitudinal bars in the negative bending moment area, and are connected to the column ends to improve the integrity between the assembled beams and columns. At the same time, the prestressed bars can be tensioned to effectively withstand the stress on the negative bending moment nodes. After the reinforcing concrete is poured, the prestressed bars are tensioned to significantly reduce the deformation and deflection of the beams and columns under load, thereby improving the integrity of the structure.

[0030] In the concrete reinforcement area of ​​the present invention, the channel is connected vertically, that is, the protruding part of the middle of the beam is hollow inside, which meets the requirement of vertical angle casting when casting micro-expansion concrete, so as to reduce the stratification and separation of concrete, and at the same time help the concrete to evenly fill the template and reduce the generation of bubbles.

[0031] The present invention arranges a positioning lap plate (support part) in the middle of the beam, and arranges a 2-3 cm angle steel connector on the lap plate, and arranges a notch of an adaptive size on the edge of the column corbel plate, so as to realize the precise positioning of the beam-column structure by overlapping the beam-column angle steel slots.

[0032] The present invention provides a prestressed tendon folding sleeve, which can effectively improve the fault tolerance when the sleeves at both ends are connected. The folding sleeve can be freely retracted into the concrete hole, and also avoids damage to the sleeve during transportation.

[0033] The present invention arranges a connecting plate and a post-casting belt extending outward at the edge of the beam, and arranges a connecting slag opening, so that the beam-slab connection is more stable, and arranges an elongated steel bar for easy connection with the floor slab.

[0034] The invention sets dense stirrups at the protruding ends of the beam and the corbel, and meets the requirement of 100mm spacing of stirrups in the dense area. The specific operation requires that the outermost stirrups are 50mm away from the positioning angle steel, and the stirrups are set without interrupting. This setting can meet the requirements of the reinforced structural dense area, wherein the distance between the embedded block and the edge of the beam and column is controlled at 40mm. This design can meet the requirements of stable overlap of beams and columns, as well as vertical casting and stirrup densification.

[0035] The post-cast superimposed layer of the present invention is located at 1 / 4 to 1 / 3 of the slab span, where the internal force is relatively small, thus ensuring the construction quality of the interface between the precast reinforced concrete beam and the precast floor slab and the steel bars, as well as the overall safety of the floor slab.

[0036] 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

[0037] 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.

[0038] 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.

[0039] Figure 1 It is a schematic cross-sectional view of a partially reinforced fully assembled prestressed concrete beam-column structure system after casting in some embodiments of the present invention;

[0040] Figure 2 It is a schematic cross-sectional view of a partially reinforced fully assembled prestressed concrete beam-column structure system before connection in some embodiments of the present invention;

[0041] Figure 3 It is a schematic diagram of the overall section after connection of the fully assembled prestressed concrete beam-column structure system with partial reinforcement in some embodiments of the present invention;

[0042] Figure 4 Schematic diagram of the three-dimensional structure of the end of a prefabricated beam according to some embodiments of the present invention;

[0043] Figure 5 It is a schematic diagram of a three-dimensional structure of a prefabricated beam viewed from above in some embodiments of the present invention;

[0044] Figure 6 A schematic diagram of the three-dimensional structure of a beam end of a prefabricated beam in another perspective of some embodiments of the present invention;

[0045] Figure 7 It is a bottom-up three-dimensional structural schematic diagram of a prefabricated beam according to some embodiments of the present invention;

[0046] Figure 8 Schematic diagram of partial splicing of precast beams and floor slabs according to some embodiments of the present invention.

[0047] Markings in the figure:

[0048] Beam-column structural system 100;

[0049] Precast beam 10, beam top longitudinal reinforcement 101, beam bottom longitudinal reinforcement 102, beam stirrups 103, beam body prestressed sleeve 104, tensioning groove 105, hollow support portion 106, support edge 1061, positioning block 1062, floor slab connection plate 107;

[0050] Prefabricated column 20, column longitudinal reinforcement 201, column stirrups 202, connecting steel bars 203, column prestressed casing 204;

[0051] Corbel plate 30, plate bottom longitudinal reinforcement 301, plate stirrup 302;

[0052] The local hollow reinforcement section 40 of the beam-column joint;

[0053] Connecting sleeve 50;

[0054] Folding sleeve 60;

[0055] Floor 70;

[0056] A first indentation area A1, a second indentation area A2, a first gap S1, and a second gap S2.

[0057] The same or corresponding symbols in the drawings indicate the same or corresponding parts. DETAILED DESCRIPTION

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] Prefabrication is 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 short construction period, resource conservation, and easier quality control. However, there are still many problems with prefabricated buildings in the prior art, such as low assembly rate, insufficient bearing capacity of assembled components and stress concentration, poor bending resistance of beam-column joints, and poor integrity of prefabricated layers and post-casting superimposed layers.

[0064] In view of this, in order to meet the needs of engineering construction, the present invention provides a fully assembled prestressed concrete beam-column structural system with local reinforcement and a construction method thereof, so as to solve the problems of excessive concentrated stress in the connection nodes of existing assembled beam-column structures, which leads to poor structural durability, seismic performance and low structural assembly rate.

[0065] The implementation of the present invention is described in detail below in conjunction with preferred embodiments.

[0066] See overall Figure 1-7 A partially reinforced fully assembled prestressed concrete beam-column structure system 100 provided in an embodiment of the present invention mainly comprises a precast beam 10, a precast column 20 and a local reinforcement structure. The precast beam 10 and the precast column 20 are prefabricated in a factory. During on-site assembly, with the help of the local reinforcement structure, while improving the assembly rate, at least one or more of the following problems can be solved: insufficient bearing capacity and stress concentration, poor bending performance of beam-column nodes, and poor integrity of precast layers and post-cast composite layers.

[0067] Continue to see Figure 1 , Figure 2 , Figure 3The precast beam 10 is a precast reinforced concrete structure, which is formed by tying beam body steel bars and pouring micro-expansion concrete. The beam body steel bars include beam top longitudinal bars 101 and beam bottom longitudinal bars 102, as well as beam stirrups 103, and may also include other possible structural bars or reinforcing bars. This part is precast and cast in one step in the factory.

[0068] In the embodiment of the present invention, the top longitudinal reinforcement 101 and the bottom longitudinal reinforcement 102 of the precast beam 10 are both extended. Figure 2 As shown, it is used to connect with the reinforcement of the prefabricated column 20 to ensure the strength of the beam-column connection. The specific extension length can be determined by calculation or construction requirements.

[0069] In the embodiment of the present invention, in the negative bending moment area at the upper part of the beam body, a beam body prestressed sleeve 104 is embedded in the beam body, and prestressed tendons are inserted into the beam body prestressed sleeve 104 during factory prefabrication, or prestressed tendons are inserted during on-site assembly. Considering the assembly efficiency, it is better to insert the prestressed tendons in advance during factory prefabrication. In addition, a tensioning groove 105 is preset at a predetermined position of the beam body, and the prestressed tendons inserted into the beam body prestressed sleeve 104 extend from the tensioning groove 105 to facilitate subsequent tensioning operations. The tensioning groove 105 is reserved in the upper part of the beam body, and the specific size meets the tensioning and is as small as possible. After the tensioning is completed, the micro-expansion concrete is poured into the groove to fill it.

[0070] Two prestressed sleeves 104 and prestressed tendons of the beam body are designed below the longitudinal reinforcement of the beam and are symmetrically arranged on the left and right sides of the beam section.

[0071] Similarly, the prefabricated column 20 is a prefabricated reinforced concrete structure, which is formed by tying column body steel bars and pouring concrete. The column body steel bars include column longitudinal bars 201 and column stirrups 202, and may also include other possible structural bars or reinforcing bars.

[0072] In an embodiment of the present invention, a connecting steel bar 203 extends from the column body of the prefabricated column 20 corresponding to the top longitudinal reinforcement 101 of the prefabricated beam 10. The connecting steel bar 203 runs horizontally through the column body and extends from one or both sides of the column to be butt-connected with the protruding end of the top longitudinal reinforcement 101.

[0073] In addition, the prefabricated column 20 is pre-buried with a column body prestressed sleeve 204 corresponding to the beam body prestressed sleeve 104. Similarly, during factory prefabrication, prestressed tendons are inserted into the column body prestressed sleeve 204 for docking and connection with the prestressed tendons in the beam.

[0074] In the embodiment of the present invention, the joint of the beam and the column is specially treated, and the cross-section of the beam end can be regarded as having three areas in height, namely, the upper part, the middle part and the lower part. The lower part of the beam end of the precast beam 10 is indented compared to the beam end to form a first indentation area A1. A corbel 30 extends from the precast column 20, and the height position of the corbel 30 corresponds to the first indentation area A1. The corbel 30 is also formed by binding the plate body steel bars and pouring concrete, and the bottom longitudinal reinforcement 301 of the corbel 30 extends out to correspond to the bottom longitudinal reinforcement 102 of the precast beam 10, and is used for butt connection with the bottom longitudinal reinforcement 102 of the beam.

[0075] It is easy to understand that the beam top longitudinal reinforcement 101 and the beam body prestressed sleeve 104 are embedded in the upper area of ​​the beam, and the first indentation area A1 is formed in the lower area of ​​the beam. The so-called indentation area is a local vacancy at the beam end where no concrete is poured to provide a docking space for the corbel plate 30 extending from the precast column 20. However, the outermost stirrups here do not extend out of the cross section but are not interrupted, and are still tied normally. The spacing between the stirrups is maintained at ≤100mm, and the outermost uninterrupted stirrups extend all the way to the beam bottom longitudinal reinforcement 102 at the bottom of the beam. Figure 2 shown.

[0076] In addition, the outermost stirrups 302 at the end of the corbel plate 30 also extend out of the cross section but are not interrupted, and are still tied normally, extending all the way to the longitudinal reinforcement 101 at the top of the beam. Figure 2 After the beam and column are overlapped, the unbroken part is tied with the upper and lower longitudinal reinforcement of the beam, and the overlap node is a hollow post-cast reinforcement area.

[0077] See also Figure 3 When the beam and column are assembled, the corbel plate 30 extends into the first indentation area A1, the beam end of the precast beam 10 is overlapped and supported on the corbel plate 30, a first gap S1 is formed between the beam end and the column body of the precast column 20, and a second gap S2 is formed at the plate end of the corbel plate 30, the prestressed tendons in the beam and the prestressed tendons in the column are connected by a prestressed sleeve, and the prestressed sleeve 104 of the beam body is butt-connected with the prestressed sleeve 204 of the column body, the prestressed tendons are tensioned and anchored in the tensioning groove 105, and after forming constraints, micro-expansion concrete is poured in the first gap S1 and the second gap S2 to form a local hollow reinforcement section 40 of the beam-column node.

[0078] By designing longitudinal stress-bearing steel bars and prestressed tendons extending out of the cross-section in the negative bending moment zone at the beam end, the prestressed tendons serve as reinforcing steel bars for the longitudinal stress-bearing steel bars in the negative bending moment zone, and then pouring micro-expansive concrete to form a local hollow reinforcement section at the beam-column node, the bending tensile performance is reinforced, the insufficient tensile performance of the longitudinal reinforcement in the negative bending moment zone is compensated, the elastic bearing capacity is improved, the cracking of the prefabricated beam end under moderate and large earthquakes is delayed, and the integrity between the prefabricated beams and columns is improved at the same time.

[0079] As a structural measure, hooks are set at the internal connections and at the edges of the longitudinal reinforcement of the column extending out of the corbel plate to ensure the stability of the corbel plate longitudinal reinforcement and the beam longitudinal reinforcement after connection, ensure the ductility under rare earthquakes, and enhance the seismic performance.

[0080] The spacing of stirrups at the beam-column connection is ≤100mm to ensure the bearing capacity of the core area of ​​the beam-column node, and the stirrups in other parts are set to a spacing of 150mm.

[0081] In some improved embodiments, the tensioning groove 105 is set at 1 / 3-1 / 4L from the beam end, where L is the beam length. This distance is the length range of the negative bending moment zone at the beam end. The stress at this location is small, and the effect of setting the tensioning groove on the structure is minimal. After the reinforcement concrete is poured, the prestressed tendons are used to tension the structure. Figure 4-6 As shown, the tensioning groove 105 is a rectangular groove ( Figure 5 The area enclosed by the middle dotted line) can run through the width of the beam or not, depending on the actual needs.

[0082] In some improved embodiments, the top longitudinal reinforcement 101 of the precast beam 10 and the connecting reinforcement 203 of the precast column 20, as well as the bottom longitudinal reinforcement 102 of the precast beam 10 and the bottom longitudinal reinforcement 301 of the corbel 30, are all connected by a connecting sleeve 50, such as Figure 2 shown.

[0083] In some improved embodiments, the beam body prestressed sleeve 104 and the column body prestressed sleeve 204 are both foldable sleeves 60, such as Figure 4-7 As shown, the part extending out of the beam end and the column body can be retracted and extended to meet the flexibility requirements. When transporting components and pouring concrete parts, it can be retracted into the hole to prevent concrete blocks from mixing into the pipeline and affecting subsequent tensioning. At the same time, it also increases the fault tolerance when the sleeve is connected. The part extending out of the beam end and the part extending out of the column end are connected through a sleeve.

[0084] In some improved embodiments, see Figure 2 , 3The precast beam 10 is provided with a hollow support portion 106 at the middle of the beam end. The hollow support portion 106 is formed with a second indentation area A2 that is indented relative to the beam end, and the second indentation area A2 is connected to the second gap S2. The so-called hollow means that it has a hollow area while providing support. The hollow area can connect the upper area and the lower area between the beam end and the column body, that is, the first gap S1, the second indentation area A2 and the second gap S2 form a pouring channel that runs from top to bottom at the beam end. The pouring channel that runs through can conveniently pour micro-expansion concrete from above to fill the beam-column junction area after setting the template, forming a local hollow reinforcement section 40 at the beam-column node. The pouring channel that runs from top to bottom satisfies the vertical angle pouring when pouring micro-expansion concrete, so as to reduce the stratification and segregation of concrete, and at the same time helps the concrete to evenly fill the template and reduce the generation of bubbles.

[0085] In some improved embodiments, the hollow support portion 106 is composed of support edges 1061 on both sides of the cross section of the prefabricated beam 10, and the two support edges 1061 are opposed to form a second indentation area A2. By extending a certain length from the upper part to the lower part of the cross section of the beam to form edges, it is easy to achieve in the prefabrication process of the beam, and it can be achieved by tying stirrups and pouring concrete after embedding fillers, and the two opposed support edges 1061 form an indentation area in the middle area, which can connect the first gap S1 and the second gap S2.

[0086] The two supporting edges 1061 form an indentation area and are supported on the corbel plate 30, which makes it easy to construct during assembly. It is only necessary to temporarily overlap the beam end on the corbel plate 30 by the two supporting edges 1061, and no other additional supporting structure is needed to support the entire prefabricated beam 10. In addition, the two supporting edges 1061 serve as concrete enclosures to reduce the workload of prefabricated formwork.

[0087] At the inflection point of the outer section of the beam, the overlap between the beam and the column is no more than 80mm, that is, the overlap distance is no more than 80mm. This can ensure that the thickness of the micro-expansive concrete poured later at the first gap S1 meets the requirements, and the length of the beam end will not be too long to cause a large cantilever effect, thereby avoiding excessive tension on the longitudinal reinforcement at the lower part of the beam.

[0088] In some improved embodiments, see Figure 2 , 4 5. A positioning block 1062 can be preset at the bottom of the support portion 106, and a positioning groove is correspondingly provided at the top of the corbel plate 30. The positioning block and the positioning groove structure can be accurately set when the beam-column structure is prefabricated in the factory. During assembly, the positioning block and the positioning groove cooperate with each other to achieve accurate assembly and positioning of the prefabricated beam 10 and the prefabricated column 20, without the need for other auxiliary measures or manual inspection. It is easy to understand that the positioning block and the positioning groove on the beam and column can be interchangeable.

[0089] The distance between the positioning block and the edge of the beam, and the distance between the positioning slot and the edge of the corbel, are both controlled at 40mm. The distance between the outermost unbroken stirrups and the positioning block and positioning slot is controlled at 50mm. The positioning block can be a positioning angle steel pre-embedded in the beam, and the size of the positioning angle steel is 30-50mm.

[0090] In some improved embodiments, see Figure 1 , 2 The second indented area A2 is shallower than the first indented area A1, or the first indented area A1 is indented deeper than the second indented area A2, so that the first gap S1, the second indented area A2 and the second gap S2 form a stepped casting channel from top to bottom. The stepped casting channel forms a stepped beam-column node local hollow reinforcement section 40 after the micro-expansive concrete is poured later. The stepped reinforcement section is combined with this place without interrupting the stirrups, so that the post-cast micro-expansive concrete and the original concrete are tied by the stirrups, which can increase the embedding of the beam-column connection, form a whole with the entire prefabricated beam structure, improve the structural integrity, and improve the structural bending resistance.

[0091] Continue to see Figure 4-8 In the embodiment of the present invention, a floor connection plate 107 extending outward is provided on at least one side of the precast beam 10, and a butt-jointed steel bar (not shown) and a butt-jointed slag opening connected to the floor are reserved on the floor connection plate 107. The floor connection plate 107 is butt-jointed with the floor slab 70 and post-cast with micro-expansive concrete to form a post-casting belt with local overlapping reinforcement at the beam edge.

[0092] A pipeline line 108 can be laid on the floor connection plate 107 to meet the layout of the power grid line.

[0093] The construction method of the partially reinforced fully assembled prestressed concrete beam-column structure system provided by the present invention is as follows:

[0094] S10: The prefabricated beam components are made in the factory. The end of the beam needs to be pre-buried with prestressed sleeves and prestressed tendons before pouring, and extend 30-50cm beyond the outer cross section of the beam. At least one side of the beam has a floor connection plate. The floor connection plate is reserved for butt joint steel bars and butt joint slags connected to the floor. The beam stirrups are tied, and the outermost stirrups at the end of the beam extend beyond the cross section without interruption, extending all the way to the longitudinal force-bearing steel bars at the bottom of the beam. The spacing of the stirrups at the end of the beam must meet the 100mm encryption design;

[0095] S20: Prefabricated column components are manufactured in the factory. Connecting steel bars are set at the corresponding connection height with the prefabricated beams, and prestressed sleeves and prestressed bars are embedded in the column body. The longitudinal bars at the bottom of the corbel plate extend out of the plate end section. The column stirrups and plate stirrups are tied. The outermost stirrups at the plate end extend out of the section but are not interrupted, and extend all the way to the longitudinal force-bearing steel bars at the top of the beam. The spacing between the stirrups at the plate end must meet the 100mm encryption design;

[0096] When making prefabricated beam components and prefabricated column components, it is also necessary to set prestressed tensioning grooves and beam-column overlap positioning angle steels and grooves, where the distance from the edge of the beam and column corbels is controlled at 40mm;

[0097] S30: butt-join and connect the beam-column structure, overlap the hollow support part of the beam end on the corbel plate, and position it with the help of the positioning block and the positioning groove, and then connect the longitudinal steel bars and the prestressed sleeve through the connecting sleeve;

[0098] S40: The prestressed tendons connecting the beam and column are anchored at one end and prestressed in the tensioning groove at the other end;

[0099] S50: Install aluminum formwork and pour micro-expansive concrete, compact the bottom plate and other slot enclosures, and use corresponding support to reinforce the formwork to prevent concrete leakage and explosion, forming a local hollow reinforcement section at the beam-column node; the assembled aluminum formwork can be set with different block formworks according to different beam heights and beam widths, and can be erected and used multiple times using fasteners prefabricated in the concrete beam;

[0100] At this time, there is sufficient bonding force between the prestressed tendons and the concrete. When the prestress is relaxed, the prestressed tendons elastically shrink and, with the help of the bonding between the prestressed tendons and the concrete, produce pre-compressive stress on the concrete.

[0101] S60: Connect beams and slabs, butt the ballast of beams and slabs, connect the butt steel bars, set up the formwork, and pour micro-expansive concrete to form a local overlapping reinforcement post-casting belt on the beam edge.

[0102] It should be noted that the prestressed tendons can be tensioned in place at one time, or they can be pre-tensioned before pouring the micro-expansive concrete, and then pour the reinforcement area concrete. After pouring to a certain strength, the final tensioning is carried out, and the tensioning is in place at this time.

[0103] The present invention realizes that in addition to satisfying the reinforcement of the negative bending moment area of ​​the beam, accurate and rapid overlap can be achieved in the beam-column connection by positioning the embedded blocks, and the sleeve connection enables the longitudinal reinforcement and prestressed sleeves on both sides to be quickly and stably connected together. The design of the overlap end in the middle of the beam not only satisfies the vertical stability of the casting, but also strengthens the connection between the components on both sides. The external pouring of micro-expansive concrete further enhances the integrity of the structure, and the post-tensioning of the prestressed tendons effectively controls the stress at the negative bending moment. At the same time, the two components are more tightly connected to prevent the problems of bending and cracking of the components and the expansion of cracks. At the same time, the invention also designs a overlap connection scheme for the beam and the floor slab, and a connection interface is reserved at the column end to provide a connection interface for subsequent construction design.

[0104] 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.

[0105] Although several specific implementation details are included in the above discussion, these should not be construed as limiting the scope of the present invention. Certain features described in the context of separate embodiments may also be implemented in a single implementation in combination. On the contrary, the various features described in the context of a single implementation may also be implemented in multiple implementations individually or in any suitable sub-combination.

Claims

1. A fully assembled prestressed concrete beam-column structure system with local reinforcement, characterized in that: include: A precast beam, wherein the longitudinal bars at the top and bottom of the beam are extended, a prestressed sleeve for the beam body is embedded in the negative bending moment zone at the upper part of the beam body, prestressed bars are inserted into the prestressed sleeve for the beam body, and a tensioning groove is preset at a predetermined position of the beam body, and the precast beam is indented at the lower part of the beam end compared to the beam end to form a first indented zone; A prefabricated column, wherein a connecting steel bar extends out of the column body of the prefabricated column corresponding to the longitudinal bars on the top of the prefabricated beam, a column body prestressed sleeve is pre-embedded corresponding to the prestressed sleeve of the beam body, a prestressed steel bar is penetrated in the prestressed sleeve of the column body, and a corbel plate extends out of the prefabricated column corresponding to the first indented area, and the longitudinal bars on the bottom of the corbel plate extend out to correspond to the longitudinal bars on the bottom of the prefabricated beam; During assembly, the beam end of the precast beam is overlapped and supported on the corbel plate, a first gap is formed between the beam end and the column body of the precast column, the corbel plate extends into the first indentation area and forms a second gap at the plate end, and the beam body prestressed sleeve is butt-connected with the column body prestressed sleeve, the prestressed tendons are tensioned and anchored in the tensioning groove, and micro-expansion concrete is post-cast in the first gap and the second gap to form a local hollow reinforcement section of the beam-column node; and The precast beam is provided with a hollow support portion in the middle of the beam end, the hollow support portion forms a second indentation area indented relative to the beam end, and the second indentation area is connected with the second gap, so that the first gap, the second indentation area and the second gap form a casting channel that passes through from top to bottom; and The hollow support portion is composed of support edges on both sides of the cross section of the prefabricated beam, and the two support edges are formed by extending a certain length from the upper part downward on both sides of the cross section of the beam, and the two support edges are opposed to form the second indentation area.

2. The prestressed concrete beam-column structural system according to claim 1, characterized in that: The tensioning groove is arranged at 1 / 3-1 / 4L away from the beam end, where L is the beam length.

3. The prestressed concrete beam-column structural system according to claim 1, characterized in that: The top longitudinal reinforcement of the precast beam and the connecting reinforcement of the precast column, as well as the bottom longitudinal reinforcement of the precast beam and the bottom longitudinal reinforcement of the corbel plate, are all connected by connecting sleeves; And / or, the beam body prestressed sleeve and the column body prestressed sleeve are both foldable sleeves, and the parts extending out of the beam end and the column body can be contracted and extended.

4. The prestressed concrete beam-column structural system according to claim 1, characterized in that: The outermost stirrups at the beam ends of the precast beam and the outermost stirrups at the plate ends of the corbels extend out of the cross section but are not interrupted, and are tied to the beam top longitudinal reinforcement and the beam bottom longitudinal reinforcement after the beams and columns are overlapped.

5. The prestressed concrete beam-column structural system according to claim 1, characterized in that: The bottoms of the two supporting edges are provided with positioning blocks / positioning grooves, and the tops of the corbels are correspondingly provided with positioning grooves / positioning blocks.

6. The prestressed concrete beam-column structural system according to claim 1, characterized in that: The second indented area is shallower than the first indented area, so that the first gap, the second indented area and the second gap form a stepped casting channel.

7. The prestressed concrete beam-column structural system according to any one of claims 1 to 6, characterized in that: At least one side of the precast beam is provided with a floor connecting plate extending outward, and a butt joint steel bar and a butt joint ballast mouth connected to the floor are reserved on the floor connecting plate, and micro-expansive concrete is poured later to form a local overlapping reinforcement post-casting belt on the beam edge.

8. A construction method of the prestressed concrete beam-column structural system according to any one of claims 1 to 7, characterized in that: The steps include: S10: The prefabricated beam components are manufactured in the factory. The prestressed sleeves and prestressed tendons of the beam body are embedded in the negative bending moment area of ​​the upper part of the beam body. The beam body and the longitudinal tendons of the beam are extended out of the cross section of the beam end. At least one side of the beam body is provided with a floor slab connection plate. The floor slab connection plate is reserved for the butt reinforcement and butt slag connection with the floor slab. The beam stirrups are tied. The outermost stirrups of the beam end are extended out of the cross section but not interrupted. S20: Prefabricated column components are manufactured in the factory. Connecting steel bars are set at the corresponding connection height with the prefabricated beams, and prestressed sleeves and prestressed bars are embedded in the column body. The longitudinal bars at the bottom of the corbel plate extend out of the plate end section. The column stirrups and plate stirrups are tied, and the outermost stirrups at the plate end extend out of the section but are not interrupted. S30: Butt and connect the beam-column structure, overlap the beam end on the corbel plate, and then connect the longitudinal reinforcement and prestressed sleeve through the connecting sleeve; S40: Connect the prestressed tendons of beams and columns and anchor them at one end, and pre-tension them in the tensioning groove at the other end; S50: Install the formwork and pour the micro-expansion concrete, and then perform secondary tensioning to form a local hollow reinforcement section at the beam-column node; S60: Connect beams and slabs, butt the ballast of beams and slabs, connect the butt steel bars, set up the formwork, and pour micro-expansive concrete to form a local overlapping reinforcement post-casting belt on the beam edge.

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