Steel connection precast concrete frame structure

Abstract

The utility model provides a steel connection precast concrete frame structure which aims at simplifying construction procedures and improving the anti-seismic property of beam column joints. The structure comprises a column and a precast beam, the column can be a cast-in-place column or a precast column, and steel structure embedded parts are embedded in the top of the column along each side. I-shaped beam end section steel is arranged at the ends of the precast beams, lower flanges of the I-shaped beam end section steel are placed on the steel structure embedded parts of the columns, and the lower flanges and the upper flanges of the precast beams are connected through the connecting steel plates and the polygonal steel plates in a welded mode. The beam end profile steel is provided with stiffening ribs, and the stress requirement in the construction stage is met. According to the node structure, the precast beam can be installed without a temporary supporting frame or a supporting bracket. According to the fabricated beam column joint, the structure and the construction process of the fabricated beam column joint are greatly simplified, the construction difficulty and the engineering cost are reduced, and the fabricated beam column joint has good anti-seismic performance and economical efficiency.

Description

Technical Field

[0001] The utility model belongs to the technical field of building construction and relates to a steel-connected prefabricated concrete frame structure. Background Art

[0002] In prefabricated concrete structures, conventional connection nodes between precast beams and precast columns generally adopt the method of post-casting with reserved node areas, in which precast beams and precast columns need to extend stress-bearing steel bars and anchor them in the post-cast node areas to ensure the stress-bearing performance of the nodes. This structure has reliable force transmission, but the connection structure is very complex, and the protruding steel bars of beams and columns collide with each other, making construction difficult. At the same time, this connection method requires the installation of additional temporary support frames at the ends of precast beams, or the installation of extended temporary support brackets at the tops of precast columns for temporary placement of precast beams. After the beam-column nodes are cast, the temporary support frames or temporary support brackets still need to be dismantled. Therefore, the construction process of conventional connection methods is more complicated and the construction cost is higher. Utility Model Content

[0003] In view of this, the purpose of the present invention is to solve the above problems and provide a steel-connected precast concrete frame structure, which can achieve fast and simple node connection by eliminating the anchor steel bars and supporting members at the beam ends, improve seismic performance, and reduce construction costs.

[0004] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions:

[0005] A steel-connected precast concrete frame structure comprises columns and precast beams, wherein the columns are precast columns or cast-in-place columns; steel structure embedded parts are pre-embedded along each side of the top of the columns, and each steel structure embedded part serves as a support for the precast beam on that side;

[0006] The ends of the precast beams are provided with beam end steel sections embedded in the concrete and extending to the outside; the beam end steel sections are I-shaped and include an upper flange, a lower flange, and a web; the ends of the webs are provided with a plurality of through holes, through which the stirrups of the precast columns are passed and fastened to the longitudinal steel bars.

[0007] There are four precast beams, located on the four sides of the column respectively. The beam end steel of each precast beam is placed on a corresponding steel structure embedded part. The lower flange of the precast beam is placed on the steel structure embedded part, and the lower flanges of the two precast beams arranged opposite each other are welded together by a connecting steel plate; the upper flanges of all precast beams are welded together by a polygonal steel plate.

[0008] The concrete interface at the precast beam end is provided with a shear keyway, and the beam end steel section is also provided with stirrups and side structural longitudinal reinforcement. The node area and the beam end steel section are poured with concrete of the same strength as the column.

[0009] Furthermore, the end of the beam end steel is provided with a stiffening rib perpendicular to the web, the two ends of the stiffening rib are respectively connected to the upper flange and the lower flange, and the side is connected to the web; the stiffening rib is located on the inner side of the stirrup of the column.

[0010] Furthermore, when the upper flange and the lower flange of the beam end section steel intersect with the longitudinal reinforcement of the column, through holes are opened on the upper flange and the lower flange, and the longitudinal reinforcement of the column passes through the through holes.

[0011] Furthermore, the longitudinal steel bars at the top and bottom of the column extend to the outside, and the longitudinal steel bars between the columns of the upper and lower adjacent sections are connected by grouting sleeves or mechanical sleeves, and the height of the connection point is set in the middle area of ​​the beam-column node; when prefabricated columns are used, the concrete bottom surface elevation of the upper prefabricated columns is lower than the top surface elevation of the floor slab of that layer.

[0012] Furthermore, the connecting steel plate and the lower flange of the beam end section steel are of equal width and thickness, and the cross-section of the butt joint between the polygonal steel plate and the upper flange of the beam end section steel is the same.

[0013] The beneficial effects of the present invention are:

[0014] 1. By eliminating the beam-end anchoring steel bars found in conventional connection nodes, this new design greatly simplifies the construction, significantly reduces installation difficulty, and allows for faster assembly of beam-column joints. Furthermore, the addition of pre-embedded steel connectors ensures superior seismic performance of beam-column joints compared to traditional methods, effectively improving the safety of prefabricated concrete structures.

[0015] 2. The utility model does not require the installation of additional temporary support frames at the beam ends or temporary support brackets extending outwards from the column tops, and can achieve reliable placement of prefabricated beams, greatly simplifying the construction process, reducing project costs and construction safety hazards.

[0016] 3. Unlike conventional steel-concrete beam-column joints, this new design incorporates only a small amount of embedded steel components within the column, ensuring the continuity and continuity of the longitudinal reinforcement. This significantly reduces steel usage, resulting in improved economics and market acceptance. Furthermore, the connectors used are all encased in concrete, eliminating the need for fire and corrosion protection measures, resulting in superior economics compared to traditional steel structure joints.

[0017] Other advantages, objectives, and features of the present invention will be described in detail in the following description and, to some extent, will be apparent to those skilled in the art upon examination and study of the following or may be learned from practice of the present invention. The objectives and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below with reference to the accompanying drawings, in which:

[0019] Figure 1 This is an overall stereoscopic diagram of the steel-connected precast concrete frame structure in the present invention.

[0020] Figure 2 This is a schematic diagram of the connection node between the center beam and the column of the utility model.

[0021] Figure 3 for Figure 2 A partial schematic diagram of the connection node between the center beam and the column.

[0022] Figure 4 Schematic diagram of the construction of prefabricated columns.

[0023] Figure 5 This is a schematic diagram of pre-embedded steel structure parts.

[0024] Figure 6 、 7 Schematic diagram of the construction of precast beams.

[0025] Figure 8 This is a schematic diagram of the embedded parts structure of the steel structure.

[0026] Figure 9 Schematic diagram of polygonal steel plate.

[0027] Figure 10 This is a schematic diagram of the central beam column and floor slab after pouring in the utility model.

[0028] Attached diagram: 1-precast column; 2-precast beam; 3-polygonal steel plate; 4-connecting steel plate; 5-floor slab; 11-longitudinal reinforcement; 12-embedded steel structure parts; 13-stirrups; 14-mechanical sleeve; 21-upper flange; 22-stiffening ribs; 23-web; 24-lower flange; 25-stirrups; 26-lateral structural longitudinal reinforcement; 27-shear keyway; 28-through hole; 29-through hole. DETAILED DESCRIPTION

[0029] The following describes the embodiments of the present invention through specific examples. Those skilled in the art can easily understand the other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. The details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention. The following embodiments and the features in the embodiments can be combined with each other without conflict.

[0030] Among them, the accompanying drawings are only for illustrative purposes and represent only schematic diagrams rather than actual pictures, and should not be understood as limiting the present invention. In order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and descriptions may be omitted in the accompanying drawings.

[0031] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "back", etc. indicating directions or positional relationships, they are based on the directions or positional relationships shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0032] See also Figures 1 to 9 , which is a steel-connected precast concrete frame structure, including a precast column 1 and a precast beam 2. A steel structure embedded part 12 is pre-embedded along each side of the top of the precast column 1. Each steel structure embedded part 12 serves as a support for the precast beam on that side, and each steel structure embedded part 12 corresponds to the precast beam 2 connected to that side; the end of the precast beam is provided with a beam end steel embedded in the concrete and extending to the outside; the beam end steel is an I-section, including an upper flange 21, a lower flange 24 and a web 23; a plurality of through holes 28 are provided at the end of the web 23, and the stirrups 13 of the precast column pass through the through holes 28. When the upper flange 21 and the lower flange 24 of the beam end steel intersect with the longitudinal steel bar 11 of the column, through holes 29 are opened on the upper flange 21 and the lower flange 24, and the column longitudinal steel bar 11 passes through the through holes 29.

[0033] There are four precast beams, one on each side of the column. Each precast beam's end steel section is placed on a corresponding embedded steel component. The lower flanges of the precast beams fit snugly against the embedded steel component, and the lower flanges of the two opposing precast beams are welded together via a connecting steel plate 4. The connecting steel plate 4 is the same width and thickness as the lower flange of the beam end steel section, and the cross-section of the polygonal steel plate and the upper flange of the beam end steel section is the same. The upper flanges of all precast beams are welded together via a polygonal steel plate 3.

[0034] The end of the beam end steel is provided with a stiffening rib 22 perpendicular to the web. The two ends of the stiffening rib 22 are respectively connected to the upper flange and the lower flange, and the side is connected to the web; the stiffening rib is located inside the stirrup 13 of the precast column.

[0035] In this embodiment, longitudinal reinforcement 11 extends from the top and bottom of the precast columns. The longitudinal reinforcement 11 between the upper and lower columns is connected via a mechanical sleeve 14, with the connection point located midway between the beam-column joint. The upper and lower reinforcement in the precast beam are welded to the upper and lower flanges of the beam end steel, respectively.

[0036] The concrete interface at the precast beam end is provided with a shear keyway 27, and the beam end steel section is also provided with stirrups 25 and side structural longitudinal reinforcement 26. The node area and the beam end steel section are poured with concrete of the same strength as the column.

[0037] See also Figure 10 Taking precast columns as an example, the support-free construction method of the steel-connected precast concrete frame structure in this embodiment includes the following steps:

[0038] (1) Factory prefabricated precast beams (2) and precast columns (1);

[0039] (2) During construction, first hoist the prefabricated column 1 into place, then hoist the prefabricated beam 2, place the beam end steel on the steel structure embedded part 12 at the top of the prefabricated column, and then weld and fix it;

[0040] (3) Use a connecting steel plate with the same width and thickness as the lower flange of the beam end steel to weld the lower flanges of the beam end steel on both sides of the precast column;

[0041] (4) Use a polygonal steel plate to weld the upper flanges of the beam end steel sections on both sides of the precast column;

[0042] (5) Hoist the prefabricated columns of the upper layer and quickly connect the longitudinal reinforcements of the upper and lower columns using a mechanical sleeve 14. After the longitudinal reinforcements of the upper and lower columns are connected, install the temporary inclined supports of the upper prefabricated columns and calibrate the verticality.

[0043] (6) Use multiple L-shaped short steel bars, pass through the through holes 28 of the web and then weld them to form stirrups in the column end node area;

[0044] (7) Install the casting formwork in the beam-column joint area;

[0045] (8) After installing the cast-in-place or prefabricated floor slab 5, the node area is sealed with a concrete formwork, and then the node concrete of this layer is poured.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the utility model.

Claims

1. A steel-connected precast concrete frame structure comprising columns and precast beams, characterized in that: The columns are prefabricated columns or cast-in-place columns; steel structure embedded parts are pre-embedded along each side of the top of the columns, and each steel structure embedded part serves as a support for the prefabricated beam on that side; The ends of the precast beams are provided with beam end steel sections embedded in the concrete and extending to the outside; the beam end steel sections are I-shaped and include an upper flange, a lower flange, and a web; the ends of the webs are provided with a plurality of through holes, through which the stirrups of the precast columns are passed and fastened to the longitudinal steel bars. There are four precast beams, located on the four sides of the column respectively. The beam end steel of each precast beam is placed on a corresponding steel structure embedded part. The lower flange of the precast beam is placed on the steel structure embedded part, and the lower flanges of the two precast beams arranged opposite each other are welded together by a connecting steel plate; the upper flanges of all precast beams are welded together by a polygonal steel plate. The concrete interface at the precast beam end is provided with a shear keyway, and the beam end steel section is also provided with stirrups and side structural longitudinal reinforcement. The node area and the beam end steel section are poured with concrete of the same strength as the column.

2. The steel-connected precast concrete frame structure according to claim 1, characterized in that: The end of the beam end steel is provided with a stiffening rib perpendicular to the web, the two ends of the stiffening rib are respectively connected to the upper flange and the lower flange, and the side is connected to the web; the stiffening rib is located on the inner side of the stirrup of the column.

3. The steel-connected precast concrete frame structure according to claim 2, characterized in that: When the upper flange and the lower flange of the beam end section steel intersect with the longitudinal reinforcement of the column, through holes are opened on the upper flange and the lower flange, and the longitudinal reinforcement of the column passes through the through holes.

4. The steel-connected precast concrete frame structure according to claim 1, characterized in that: The longitudinal reinforcements at the top and bottom of the column extend to the outside, and the longitudinal reinforcements between the columns of the upper and lower adjacent sections are connected by grouting sleeves or mechanical sleeves, and the height of the connection point is set in the middle area of ​​the beam-column node; when prefabricated columns are used, the concrete bottom surface elevation of the upper prefabricated columns is lower than the top surface elevation of the floor slab of that layer.

5. The steel-connected precast concrete frame structure according to claim 1, characterized in that: The connecting steel plate and the lower flange of the beam end section steel are of equal width and thickness, and the butt interface cross-sections of the polygonal steel plate and the upper flange of the beam end section steel are the same.

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