A large reinforced concrete beam bottom hanger embedded part

Abstract

The present invention relates to the technical field of building engineering, and discloses a large reinforced concrete beam bottom hanger embedded part, comprising a steel plate, a fixed hanging ear welded on the lower surface, a rectangular connecting weld formed at the connection between the steel plate and the hanging ear, two mutually parallel opposite sides of the connecting weld arranged in parallel with two mutually parallel outer edges of the steel plate, and the other two mutually parallel opposite sides of the connecting weld arranged in parallel with the other two mutually parallel outer edges of the steel plate; a plurality of anchor bars, the anchor bars extending vertically upward on the upper surface of the steel plate, the connecting lines of the intersection points of the plurality of anchor bars and the upper surface of the steel plate form a rectangular wire frame, so that the plurality of anchor bars constitute a rectangular support; each side of the rectangular wire frame is located in a rectangular annular space between the connecting weld and the outer edge of the steel plate, and the plurality of anchor bars are evenly arranged along the rectangular wire frame. The present invention evenly distributes the hanging rod tension to each anchor bar, realizes the four-side simple support condition of the steel plate, and the thickness of the steel plate calculated thereby is more in line with the actual application of the project.

Description

Technical Field

[0001] The invention relates to the technical field of building engineering, in particular to a large reinforced concrete beam bottom hanger embedded part. Background Art

[0002] The most unfavorable stress state of embedded parts is tension and bending; bending moment actually causes the anchor bar to be tensioned in the end. The tension of the anchor bar will cause local bending of the steel plate. Therefore, the key to the design of embedded parts lies in how to deal with the relationship between the thickness of the steel plate and the reduction factor of the bearing capacity of the embedded parts. At present, when designing embedded parts, it is believed that the load borne by the embedded parts is a distributed load, so the anchor bars are evenly distributed on the steel plate. However, according to the actual construction site, it is necessary to consider the support conditions in order to convert the concentrated load into a distributed load. When the load action area is small and there is stress concentration, the load borne by the embedded parts will no longer be a distributed load. At this time, the steel plate thickness obtained according to the uniformly distributed anchor bars will be difficult to meet the actual engineering use. Summary of the invention

[0003] In view of the above problems, the purpose of the present invention is to provide a large reinforced concrete beam bottom hanger embedded part to solve the problem in the prior art that when the load action area is small and there is stress concentration, the thickness of the steel plate obtained according to the uniformly distributed anchor bars is difficult to meet the actual engineering use.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] The large reinforced concrete beam bottom hanger embedded part of the present invention comprises:

[0006] A steel plate, a fixing lug is welded to the lower surface of the steel plate, a rectangular connecting weld is formed at the connection between the steel plate and the lug, two mutually parallel opposite sides of the connecting weld are arranged in parallel with two mutually parallel outer edges of the steel plate, and the other two mutually parallel opposite sides of the connecting weld are arranged in parallel with the other two mutually parallel outer edges of the steel plate;

[0007] A plurality of anchor bars are arranged to extend vertically upward on the upper surface of the steel plate, and the connecting lines of the intersection points of the plurality of anchor bars and the upper surface of the steel plate form a rectangular wire frame, so that the plurality of anchor bars constitute a rectangular support; two mutually parallel opposite sides of the rectangular wire frame are arranged in parallel with two mutually parallel opposite sides of the connecting weld, and the other two mutually parallel opposite sides of the rectangular wire frame are arranged in parallel with two mutually parallel opposite sides of the connecting weld; each side of the rectangular wire frame is located in a rectangular annular space between the connecting weld and the outer edge of the steel plate, and the plurality of anchor bars are evenly arranged along the rectangular wire frame.

[0008] Preferably, stiffening ribs are connected between adjacent anchor bars, the side edges of the stiffening ribs are fixedly welded to the anchor bars, and the bottom edges of the stiffening ribs are fixedly welded to the lower surface of the steel plate.

[0009] Preferably, the stiffening rib plate is provided with through holes for the longitudinal reinforcement of the beam to pass through.

[0010] Preferably, the interval between the rectangular wire frame and the outer edge of the steel plate is equal to the interval between the rectangular wire frame and the connecting weld.

[0011] Preferably, the steel plate and the connecting weld are both square, and the center of the steel plate and the center of the connecting weld are located in the same vertical line.

[0012] Preferably, the number of the anchor bars is a multiple of 4.

[0013] Preferably, one anchor bar is fixed to each vertex position of the rectangular wire frame.

[0014] Compared with the prior art, the embedded part of the large reinforced concrete beam bottom hanger rod in the embodiment of the present invention has the following beneficial effects:

[0015] The embedded part of the large reinforced concrete beam bottom hanger in the embodiment of the present invention forms a rectangular connection weld at the connection between the steel plate and the lifting ear, and each side of the rectangular connection weld is arranged in parallel with the outer edge of the steel plate; the lines connecting the intersections of multiple anchor bars and the steel plate form a rectangular wire frame, and each side line of the rectangular wire frame is arranged in parallel with each side of the connection weld, and each side of the rectangular wire frame is located in the rectangular annular space between the connection weld and the outer edge of the steel plate, and a rectangular support constraint is formed around the steel plate by the anchor bars. The tension of the hanger is transmitted to the rectangular connection weld through the lifting ear. The connection weld is rectangular and uniformly stressed. Combined with the anchor bars uniformly distributed between the connection weld and the outer edge of the steel plate, the connection weld can convert the stress into a uniformly distributed load on the steel plate, thereby evenly distributing the hanger tension to each anchor bar, realizing the four-side simple support condition of the steel plate, and the calculated steel plate thickness is more in line with the actual engineering application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a cross-sectional schematic diagram of the installation of the large reinforced concrete beam bottom hanger embedded part in the concrete beam according to the embodiment of the present invention;

[0017] Figure 2 It is a side view schematic diagram of the installation of the large reinforced concrete beam bottom hanger embedded part in the concrete beam according to the embodiment of the present invention;

[0018] Figure 3 yes Figure 1 A-A view in the figure;

[0019] Figure 4 It is a simplified diagram of the model calculation of the embedded parts of the bottom hanger of a large reinforced concrete beam according to an embodiment of the present invention;

[0020] In the figure, 1, steel plate; 11, connecting weld; 2, anchor bar; 21, rectangular wire frame; 3, stiffening rib; 4, lifting lug; 5, longitudinal reinforcement of beam; 6, stirrups; 7, beam. DETAILED DESCRIPTION

[0021] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0024] like Figure 1 - Figure 4As shown, a large reinforced concrete beam bottom hanger embedded part according to an embodiment of the present invention comprises a steel plate 1 and a plurality of anchor bars 2, wherein the steel plate 1 is rectangular, a hanger ear 4 for connecting the hanger is welded and fixed to the lower surface of the steel plate 1, and a rectangular connecting weld 11 is formed at the connection between the steel plate 1 and the hanger ear 4, two mutually parallel opposite sides of the connecting weld 11 are arranged in parallel with two mutually parallel outer edges of the steel plate 1, and the other two mutually parallel opposite sides of the connecting weld 11 are arranged in parallel with the other two mutually parallel outer edges of the steel plate 1; the anchor bars 2 extend vertically upward from the upper surface of the steel plate 1 and are arranged in the beam 7, and the plurality of anchor bars 2 are arranged in the beam 7. The connecting lines of the intersection points of the anchor bars 2 and the upper surface of the steel plate 1 form a rectangular wire frame 21, so that the multiple anchor bars 2 constitute a rectangular support to form a peripheral constraint on the steel plate 1; the two mutually parallel opposite sides of the rectangular wire frame 21 are arranged in parallel with the two mutually parallel opposite sides of the connecting weld 11, and the other two mutually parallel opposite sides of the rectangular wire frame 21 are arranged in parallel with the two mutually parallel opposite sides of the connecting weld 11; each side of the rectangular wire frame 21 is located in the rectangular annular space between the connecting weld 11 and the outer edge of the steel plate 1, and the multiple anchor bars 2 are evenly arranged along the edge lines of the rectangular wire frame 21.

[0025] The present invention arranges multiple anchor bars 2 in the rectangular annular space between the connecting weld 11 and the outer edge of the steel plate 1, and the evenly distributed anchor bars 2 form a rectangular support constraint around the steel plate 1. Different from the anchor bar 2 group evenly arranged in the entire steel plate 1, the anchor bars 2 in the present invention are only arranged in the rectangular annular space outside the connecting weld 11, and the function is to realize the peripheral support constraint of the steel plate 1, form a uniformly distributed load in the steel plate 1, and simplify the calculation model. The tension of the hanger is transmitted to the rectangular connecting weld 11 through the lifting lug 4. The connecting weld 11 is rectangular and uniformly stressed. Combined with the anchor bars 2 evenly distributed between the connecting weld 11 and the outer edge of the steel plate 1, the connecting weld 11 can convert the stress into a uniformly distributed load on the steel plate 1. Even in the case of a small load action area and stress concentration, the tension of the hanger can be evenly distributed to each anchor bar 2, so as to realize the four-side simple support condition of the steel plate 1 and simplify the calculation model. The thickness of the steel plate 1 calculated in this way is more in line with the actual engineering application.

[0026] In this embodiment, stiffening ribs 3 are connected between adjacent anchor bars 2, the side edges of the stiffening ribs 3 are welded and fixed to the anchor bars 2, and the bottom edges of the stiffening ribs 3 are welded and fixed to the lower surface of the steel plate 1. When the interval between adjacent anchor bars 2 is large, the set stiffening ribs 3 can prevent the rectangular support constraint formed by the anchor bars 2 from deforming, and can ensure that the rectangular support constraint meets the support conditions required by the calculation model, ensuring that the steel plate 1 model can be simplified to a four-sided simply supported condition.

[0027] Furthermore, the stiffening ribs 3 are provided with through holes for the longitudinal reinforcements 5 and stirrups 6 of the beam to pass through, so as to prevent the stiffening ribs 3 from interfering with the arrangement of the longitudinal reinforcements 5 of the beam.

[0028] Furthermore, after the stiffening ribs 3 are provided, considering that the bonding between the longitudinal reinforcement 5 of the beam and the concrete is weakened, the anchoring length of the anchor bar 2 can be appropriately increased as compensation, and the length of the anchor bar 2 is the sum of the design length of the anchor bar 2 and the compensation length.

[0029] In this embodiment, the interval between the rectangular wire frame 21 and the outer edge of the steel plate 1 is equal to the interval between the rectangular wire frame 21 and the connecting weld 11 .

[0030] In this embodiment, the steel plate 1 and the connecting weld 11 are both square, and the center of the steel plate 1 and the center of the connecting weld 11 are located in the same vertical line.

[0031] Preferably, the number of anchor bars 2 is a multiple of 4 to ensure that the anchor bars 2 are evenly distributed and meet the requirements of uniform constraints. Furthermore, one anchor bar 2 is fixed to each vertex position of the rectangular wire frame 21, and the anchor bars 2 are evenly arranged on each side line of the rectangular wire frame 21. For example, when four anchor bars 2 are provided, the four anchor bars 2 are respectively arranged at each vertex of the rectangular wire frame 21. When eight anchor bars 2 are provided, four of the anchor bars 2 are respectively arranged at each vertex of the rectangular wire frame 21, and the other four anchor bars 2 are respectively arranged at the midpoint position of each side line of the rectangular wire frame 21.

[0032] like Figure 4 As shown, the tension of the hanger rod is transmitted to the steel plate 1 through the connecting weld 11, and the concentrated load of the hanger rod tension is converted into a uniformly distributed load. The rectangular wire frame 21 is used as a boundary. The maximum bending moment of the steel plate 1 can be calculated according to the uniformly distributed load on the steel plate 1 and the length and width of the steel plate according to the following formulas (1) and (2). According to the maximum bending moment, the thickness of the steel plate 1 can be checked to see whether it meets the requirements through the following formula (3).

[0033] p=P / (a·b) (1)

[0034] M max =β·p·a 2 (2)

[0035]

[0036] Among them, p is the uniformly distributed load generated by the hanger tension P; a is the length of the short side of the steel plate; b is the length of the long side of the steel plate; Mmax is the maximum bending moment of the steel plate; t is the required thickness of the steel plate; f is the design value of the tensile strength of the steel.

[0037] After simplifying the steel plate 1 model to a four-side simply supported condition, the bending moment coefficient can be determined through the following Table 1, and the bending moment of the steel plate 1 can be calculated based on the bending moment coefficient, thereby determining the thickness of the steel plate 1.

[0038] Table 1

[0039] b / a 1.0 1.1 1.2 1.3 1.4 1.5 β 0.0479 0.0553 0.0626 0.0693 0.0753 0.0812 b / a 1.6 1.7 1.8 1.9 2.0 ＞2.0 β 0.0862 0.0908 0.0948 0.0985 0.1017 0.1250

[0040] In Table 1, a is the length of the short side of the steel plate; b is the length of the long side of the steel plate, and β is the bending moment coefficient.

[0041] In summary, an embodiment of the present invention provides a large reinforced concrete beam bottom hanger embedded part, which forms a rectangular connecting weld 11 at the connection between the steel plate 1 and the lifting ear 4, and the sides of the rectangular connecting weld 11 are respectively arranged in parallel with the outer edge of the steel plate 1; the connecting lines of the intersection points of multiple anchor bars 2 and the steel plate 1 form a rectangular wire frame 21, and the side lines of the rectangular wire frame 21 are arranged in parallel with the sides of the connecting weld 11, and the sides of the rectangular wire frame 21 are all located in the rectangular annular space between the connecting weld 11 and the outer edge of the steel plate 1, and a rectangular support constraint is formed around the steel plate 1 by the anchor bars 2, thereby simplifying the calculation model of the bending moment of the steel plate 1. The tension of the hanger is transmitted to the rectangular connecting weld 11 through the lifting ear 4. The connecting weld 11 is rectangular and evenly stressed. Combined with the anchor bars 2 evenly distributed between the connecting weld 11 and the outer edge of the steel plate 1, the connecting weld 11 can convert the stress into a uniformly distributed load on the steel plate 1, thereby evenly distributing the hanger tension to each anchor bar 2, achieving the four-side simply supported condition of the steel plate 1. The thickness of the steel plate 1 calculated in this way is more in line with actual engineering applications.

[0042] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A large reinforced concrete beam bottom hanger embedded part, characterized in that: include: A steel plate, a fixing lug is welded to the lower surface of the steel plate, a rectangular connecting weld is formed at the connection between the steel plate and the lug, two mutually parallel opposite sides of the connecting weld are arranged in parallel with two mutually parallel outer edges of the steel plate, and the other two mutually parallel opposite sides of the connecting weld are arranged in parallel with the other two mutually parallel outer edges of the steel plate; A plurality of anchor bars, wherein the anchor bars are arranged to extend vertically upward on the upper surface of the steel plate, and the connecting lines of the intersection points of the plurality of anchor bars and the upper surface of the steel plate form a rectangular wire frame, so that the plurality of anchor bars constitute a rectangular support to form a peripheral constraint on the steel plate; two mutually parallel opposite sides of the rectangular wire frame are arranged in parallel with two mutually parallel opposite sides of the connecting weld, and the other two mutually parallel opposite sides of the rectangular wire frame are arranged in parallel with two mutually parallel opposite sides of the connecting weld; each side of the rectangular wire frame is located in a rectangular annular space between the connecting weld and the outer edge of the steel plate, and the plurality of anchor bars are evenly arranged along the rectangular wire frame; A stiffening rib plate is connected between adjacent anchor bars, the side edges of the stiffening rib plate are welded and fixed to the anchor bars, and the bottom edge of the stiffening rib plate is welded and fixed to the lower surface of the steel plate; The distance between the rectangular wire frame and the outer edge of the steel plate is equal to the distance between the rectangular wire frame and the connecting weld; The steel plate and the connecting weld are both square, and the center of the steel plate and the center of the connecting weld are located in the same vertical line; The tensile force of the suspender rod is transmitted to the steel plate through the connecting weld, and the concentrated load of the tensile force of the suspender rod is converted into a uniformly distributed load; the steel plate model is simplified to a four-side simply supported condition, and the thickness of the steel plate is verified by the following formula: Among them, P is the tension of the hanger rod; a is the length of the short side of the steel plate; b is the length of the long side of the steel plate; t is the required thickness of the steel plate; f is the design value of the tensile strength of the steel; β is the bending moment coefficient.

2. The large reinforced concrete beam bottom hanger embedded part according to claim 1 is characterized in that: The reinforcing rib plate is provided with through holes for the longitudinal reinforcement of the beam to pass through.

3. The large reinforced concrete beam bottom hanger embedded part according to claim 1, characterized in that: The number of the anchor bars is a multiple of 4.

4. The large reinforced concrete beam bottom hanger embedded part according to claim 3, characterized in that: An anchor bar is fixed at each vertex position of the rectangular wire frame.

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