Connecting structure of steel structure cantilever beam and concrete beam

Abstract

The utility model provides a steel structure cantilever beam and concrete beam connecting structure which comprises a concrete secondary beam, a concrete boundary beam and a cantilever steel beam, the concrete boundary beam is higher than the concrete secondary beam, and the concrete boundary beam is connected with the cantilever steel beam through a steel rib beam with a variable cross section. The steel rib beam is pre-buried in the concrete secondary beam and the concrete boundary beam, the large-section area of the steel rib beam extends out of the concrete boundary beam, the length of the extending part is not larger than 1 m, and the section of the large-section area of the steel rib beam is the same as the size of the cantilever steel beam. The cantilever steel beam upper flange and the cantilever steel beam lower flange are respectively welded with the steel rib beam upper flange and the steel rib beam lower flange which extend out of the concrete boundary beam, and the cantilever steel beam web is connected with the steel rib beam web which extends out of the concrete boundary beam through a connecting plate and a bolt. According to the utility model, the span space of the overhanging design is expanded, and the comprehensive technical advantages of high construction quality, high speed, safety and reliability are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to building design technical field, especially a steel structure cantilever beam and concrete beam connecting structure, the structure can be applied to the local large cantilever design demand when the plane and facade of high-rise concrete structure are irregular, solve the demand of cantilever beam refinement design, also fully consider the process requirement of construction climbing frame, facilitate construction organization design, greatly improve construction quality and construction progress, effectively prevent construction risk at the same time. BACKGROUND

[0002] Among the conventional design schemes of the existing high-rise building local cantilever, one is directly using concrete beam to complete cantilever design. From the design point of view, when realizing the cantilever of small span, the section of concrete cantilever beam is still within the acceptable range of building modeling, and the stress reinforcement is not too dense, so the design scheme is feasible. However, when realizing the cantilever of large span, the section of concrete cantilever beam is too large to affect the appearance, and the large self-weight of concrete beam further increases the load of cantilever structure, resulting in that the stress reinforcement of cantilever beam is too dense, and the feasibility of the design scheme is poor. Moreover, from the construction point of view, the local concrete cantilever structure in high-rise building will cause that the construction organization, quality, progress and safety are difficult to be effectively controlled. If irregular local concrete cantilever structure appears on the building plane and facade, such as some floors are not provided with cantilever beam, or the cantilever length of cantilever beam of each floor is different, the building facade is not in the same plane, thereby affecting the design and installation of construction climbing frame. If the climbing frame is designed according to the building contour with cantilever, it cannot be attached in the floor without cantilever. If the climbing frame is not designed considering the cantilever part, it cannot pass through the floor with cantilever. The formwork support system of cantilever concrete structure also has a dilemma. If high formwork scheme is used, the risk of super high formwork is huge. If cantilever formwork system is used, the time cost and business cost of construction will be doubled. If the cantilever part is reserved for the floor climbed by the climbing frame, and then poured again, although the problem of time cost is solved, the construction joint set in the root area of cantilever is a big taboo for quality control.

[0003] In order to solve the above problems, another way is to directly use steel structure to realize cantilever beam design. The existing steel structure cantilever beam is generally connected with the main structure through the embedded part (as shown in Figure 1 and Figure 2 ) on the side of concrete beam or the embedded steel skeleton (as shown in Figure 3 ) in the concrete boundary beam. The cantilever steel structure of this scheme can be constructed twice after the main concrete is completed, effectively solving many problems caused by the one-time pouring of cantilever concrete structure. However, this scheme also has its limitations, such as Figure 1The method of embedding a part through the side of a concrete beam, and the process of welding the cantilever steel beam and the embedded part, have the risk of high-temperature damage to the concrete structure. Figure 1 And Figure 3 Both of the above methods will generate a large torque on the concrete side beam, and considering the force capacity and durability requirements of the embedded part, the embedded part can only withstand a small bending moment, which poses a safety risk for achieving a large-span cantilever.

[0004] Therefore, how to ensure the strength of the steel cantilever beam while ensuring the aesthetics is an important problem, and a steel cantilever beam and concrete beam connecting structure with high construction quality, fast speed, and safety and reliability needs to be provided. SUMMARY

[0005] In view of the defects in the background art, the utility model provides a steel cantilever beam and concrete beam connecting structure, which has high construction quality, fast speed, safety and reliability, and can expand the span space of the cantilever design.

[0006] To solve the above technical problems, the utility model provides a steel cantilever beam and concrete beam connecting structure, which comprises a concrete secondary beam, a concrete side beam and a cantilever steel beam, the height of the concrete side beam is higher than that of the concrete secondary beam, the concrete side beam and the cantilever steel beam are connected through a steel skeleton beam with a variable cross section, the steel skeleton beam is embedded in the concrete secondary beam and the concrete side beam, a large cross section area of the steel skeleton beam partially extends out of the concrete side beam, and the length of the extended part is not greater than 1m, the cross section of the large cross section area of the steel skeleton beam is the same in size as the cantilever steel beam, the upper flange of the cantilever steel beam and the lower flange of the cantilever steel beam are respectively welded with the upper flange of the steel skeleton beam and the lower flange of the steel skeleton beam which extend out of the concrete side beam, and the web of the cantilever steel beam is connected with the web of the steel skeleton beam which extends out of the concrete side beam through a connecting plate and bolts.

[0007] The further technical scheme of the utility model is that the part of the steel skeleton beam which extends out of the concrete side beam and the top surface of the cantilever steel beam are fixedly connected with a steel bar truss floor slab through first anchor nails, and the top surface of the steel bar truss floor slab is in the same plane as the top surface of the concrete side beam.

[0008] The utility model discloses a better technical scheme: the steel beam web length of concrete edge beam extension is 45~55cm, the upper flange length of steel beam is 65~75cm, the lower flange length of steel beam is 25~35cm, the upper flange of cantilever steel beam and steel beam butt joint part is shorter than web, the lower flange is longer than web, and the upper flange and the lower flange length of cantilever steel beam of butt joint part matches the upper flange and the lower flange length of steel beam of concrete edge beam extension, the upper flange of steel beam of concrete edge beam extension is welded on the upper edge of the part of steel beam web and the part of cantilever steel beam web longer than the upper flange, and the lower flange of cantilever steel beam is welded on the lower edge of the part of steel beam web and the part of cantilever steel beam web longer than the lower flange.

[0009] The utility model discloses a better technical scheme: a row of bolt holes are equipped respectively in the steel beam web of concrete edge beam extension and the butt joint part of cantilever steel beam web, and the both sides of the butt joint part of steel beam web and cantilever steel beam web are respectively equipped with the connecting plate with bolt hole, and steel beam web and cantilever steel beam web are fixedly connected through two connecting plates and multiple bolts.

[0010] The utility model discloses a better technical scheme: the small section part of steel beam is embedded in the middle part of concrete secondary beam, and the large section part of steel beam is embedded in the middle part of concrete edge beam, and the center line of steel beam, concrete secondary beam, concrete edge beam and cantilever steel beam in horizontal direction coincides.

[0011] The utility model discloses a better technical scheme: the width of steel beam and cantilever steel beam is same, the height of small section area of steel beam is 1 / 3~1 / 2 of the section height of cantilever steel beam, and the height of large section area of steel beam is equal to the section height of cantilever steel beam.

[0012] The utility model discloses a better technical scheme: the terminal length of steel beam extension to concrete secondary beam in the side edge of concrete edge beam near cantilever steel beam is recorded as rooting length L, and the rooting length L is not less than 2.5 times of the section height of cantilever steel beam.

[0013] The utility model discloses a better technical scheme: steel beam and cantilever steel beam all adopt I-beam, and the upper flange of cantilever steel beam is equal width and equal thickness with the upper flange of steel beam, and the lower flange of cantilever steel beam is equal width and equal thickness with the lower flange of steel beam.

[0014] The utility model discloses a better technical scheme: the second anchor nail is installed and set on the upper flange of steel beam at equal intervals, and a plurality of stiffening rib plates are distributed on steel beam.

[0015] The utility model discloses a better technical scheme: the utility model discloses a better technical scheme: compared with prior art, it has the advantages of:

[0016] (1) The utility model gives full play to respective advantages of concrete structure and steel structure, provides effective support for force transmission and anchoring of the overhanging steel beam through the rooted steel beam, improves the design reliability of the large-span overhanging scheme with better stress model and higher safeguard measures, expands the span space of the overhanging design, and has the comprehensive technical advantages of high construction quality, fast speed and safe reliability;

[0017] (2) The utility model realizes the secondary construction of the local overhanging part through the reserved field connecting joint of the overhanging steel beam, effectively solves the difficulties encountered in the construction climbing frame design, arranges the implementation of the overhanging part outside the key construction line, effectively compresses the construction practice, and realizes rapid construction;

[0018] (3) The overhanging part of the secondary implementation of the utility model can directly adopt the structure form of steel structure overhanging beam + steel bar truss floor support plate, avoids the problem of high formwork or overhanging formwork required by the original construction from the design scheme, and provides technical support for the improvement of construction quality and construction safety. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a schematic diagram of the prior art concrete side embedded part;

[0020] Figure 2 It is Figure 1 AA cross-sectional view;

[0021] Figure 3 It is a schematic diagram of the prior art embedded steel beam;

[0022] Figure 4 It is a schematic diagram of the overall structure of the utility model;

[0023] Figure 5 It is Figure 4 AA cross-sectional view;

[0024] Figure 6 It is Figure 4 BB cross-sectional view;

[0025] Figure 7 It is a schematic diagram of the floor support plate and the overhanging steel beam connection of the utility model.

[0026] Drawing reference: 1-concrete secondary beam; 2-steel beam; 200-steel beam upper flange; 201-steel beam lower flange; 202-steel beam web; 3-overhanging steel beam; 300-overhanging steel beam upper flange; 301-overhanging steel beam lower flange; 302-overhanging steel beam web; 4-concrete side beam; 5-connection plate; 6-bolt; 7-first anchor; 8-steel bar truss floor support plate; 9-bolt hole; 10-second rivet; 11-concrete side embedded part, 12-embedded steel beam; 13-stiffened rib plate. DETAILED DESCRIPTION

[0027] The utility model will be further described below in combination with the drawings and embodiments. The drawings of the embodiments are Figures 1 to 7 are the drawings of the embodiments, are drawn in a simplified way, and are only used for the purpose of clearly and concisely illustrating the embodiments of the utility model. The technical solutions shown in the drawings below are specific schemes of the embodiments of the utility model, and are not intended to limit the scope of the utility model claimed. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0028] In the description of the utility model, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "inner", "outer", "left", "right" and the like is based on the orientation or position relationship shown in the drawings, or is the orientation or position relationship commonly used when the utility model product is used, or is the orientation or position relationship commonly understood by those skilled in the art, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second" and the like are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0029] The embodiment provides a steel structure cantilever beam and concrete beam connecting structure, which comprises a steel structure cantilever beam and a concrete beam. Figures 4 to 7As shown, it comprises a concrete secondary beam 1, a concrete edge beam 4 whose height is higher than the concrete secondary beam 1, and a cantilever steel beam 3, the concrete edge beam 4 is connected with the cantilever steel beam 3 through a steel skeleton beam 2 with variable cross-section, the steel skeleton beam 2 is embedded in the concrete secondary beam 1 and the concrete edge beam 4, the large cross-section area of the steel skeleton beam 2 partially extends out of the concrete edge beam 4, and the length of the extended part is not more than 1m. The steel skeleton beam 2 and the cantilever steel beam 3 both adopt I-beam; the length of the web 202 of the steel skeleton beam extending out of the concrete edge beam 4 is 50cm, the length of the upper flange 200 of the steel skeleton beam is 70cm, and the length of the lower flange 201 of the steel skeleton beam is 30cm. The width of the steel skeleton beam 2 and the cantilever steel beam 3 is the same, the height of the small cross-section area of the steel skeleton beam 2 is 1 / 3-1 / 2 of the cross-section height of the cantilever steel beam 3, and the height of the large cross-section area of the steel skeleton beam 2 is equal to the cross-section height of the cantilever steel beam 3. The upper flange 300 of the cantilever steel beam is equal in width and thickness to the upper flange 200 of the steel skeleton beam; the lower flange 301 of the cantilever steel beam is equal in width and thickness to the lower flange 201 of the steel skeleton beam; the upper flange of the butt joint part of the cantilever steel beam 3 and the steel skeleton beam 2 is shorter than the web, and the lower flange is longer than the web, and the length of the upper flange 300 and the lower flange 301 of the butt joint part of the cantilever steel beam matches the length of the upper flange 200 and the lower flange 201 of the steel skeleton beam extending out of the concrete edge beam 4; the upper flange 200 of the steel skeleton beam extending out of the concrete edge beam 4 is welded to the upper edge of the part of the web 202 of the steel skeleton beam and the web 302 of the cantilever steel beam which is longer than the upper flange 300 of the cantilever steel beam, and the lower flange 301 of the cantilever steel beam which is longer than the web 302 of the cantilever steel beam is welded to the lower edge of the part of the web 202 of the steel skeleton beam which is longer than the lower flange 201 of the steel skeleton beam. A row of bolt holes 9 are respectively arranged at the butt joint parts of the web 202 of the steel skeleton beam and the web 302 of the cantilever steel beam extending out of the concrete edge beam 4, and connecting plates 5 with bolt holes are respectively arranged at the two sides of the butt joint parts of the web 202 of the steel skeleton beam and the web 302 of the cantilever steel beam, and the web 202 of the steel skeleton beam and the web 302 of the cantilever steel beam are fixedly connected through the two connecting plates 5 and a plurality of bolts 6.

[0030] In the embodiment, as shown in Figures 4 to 7As shown, the part of the steel reinforced beam 2 extending out of the concrete edge beam 4 and the top surface of the cantilevered steel beam 3 are fixedly connected with the steel bar truss floor slab 8 through the first anchor nail 7, and the top surface of the steel bar truss floor slab 8 is in the same plane as the top surface of the concrete edge beam 4. The second anchor nail 10 is installed on the upper flange of the steel reinforced beam 2 at equal intervals, and the second anchor nail 10 provides more stable support for the connection between the steel reinforced beam 2 and the cantilevered steel beam 3. The steel reinforced beam 2 is distributed with a plurality of stiffening rib plates 13. The small cross-section part of the steel reinforced beam 2 is embedded in the middle part of the concrete secondary beam 1, and the large cross-section part of the steel reinforced beam 2 is embedded in the middle part of the concrete edge beam 4, and the center lines of the steel reinforced beam 2, the concrete secondary beam 1, the concrete edge beam 4 and the cantilevered steel beam 3 in the horizontal direction coincide. The terminal length of the steel reinforced beam 2 extending into the concrete secondary beam 1 from the side edge of the concrete edge beam 4 adjacent to the cantilevered steel beam 3 is recorded as the rooting length L, and the rooting length L is not less than 2.5 times the cross-sectional height of the cantilevered steel beam 3.

[0031] In the embodiment, in actual construction, the cross-sectional width of the concrete secondary beam 1 is the width of the lower flange of the steel reinforced beam 2 plus 200mm, the cross-sectional height of the concrete secondary beam 1 is the height of the steel reinforced beam 2 plus the thickness of the floor slab plus 120mm, the cross-sectional height of the steel reinforced beam 2 is half of the cross-sectional height of the cantilevered steel beam 3, and cannot be less than one third of the cross-sectional height of the cantilevered steel beam 3, and the upper flange of the steel reinforced beam 2 and the upper flange of the cantilevered steel beam 3 are kept equal in width and thickness. Through the respective advantages of the concrete secondary beam 1, the concrete edge beam 4 and the cantilevered steel beam 3, and through the rooting type steel reinforced beam 2, the bearing capacity is provided for the cantilevered steel beam 3, and effective support is provided for the entire connecting structure, the combination of the concrete beam structure and the cantilevered steel beam structure has a more optimal stress model and higher safety measures, and the reliability of the large-span cantilever structure is improved. The utility model expands the span space involved in the cantilever, and has the comprehensive technical advantages of high construction quality, fast speed, safety and reliability.

[0032] The part of the steel reinforced beam 2 extending out of the concrete edge beam 4 can be used as a part of the cantilevered steel beam 3 later, and the steel reinforced beam 2 is constructed with the main structure concrete at one time. After the construction climbing frame passes the floor under construction, the cantilevered steel beam structure part outside the field splicing line is constructed at the second time according to the requirements of the field splicing joint. The local cantilevered part is constructed at the second time through the reserved field connecting joint of the cantilevered steel beam 3, which effectively solves the problem that the construction climbing frame cannot be constructed. Meanwhile, the cantilevered part is arranged outside the key construction line, which effectively compresses the construction time and realizes rapid construction. The distance between the upper flange of the cantilevered steel beam 3 and the floor elevation is reserved to be the same as the thickness of the floor slab, and the steel bar truss floor support plate 8 can be used as the floor slab later. Through the scheme of using the steel bar truss floor support plate 8, the requirement of field formwork free is realized. The cantilevered part constructed at the second time adopts the structure form of steel structure plus steel bar truss floor support plate 8, which avoids the problem of high formwork or cantilevered formwork required in the original construction, and provides technical support for the improvement of construction quality and construction safety.

[0033] The above is only one embodiment of the present application, which is described in more detail, but it cannot be understood as a limitation on the scope of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A structure for connecting a steel cantilever beam to a concrete beam, comprising a concrete secondary beam (1), a concrete edge beam (4) and a cantilever steel beam (3), characterized in that: The height of the concrete edge beam (4) is higher than that of the concrete secondary beam (1), the concrete edge beam (4) is connected with the cantilever steel beam (3) through the steel skeleton beam (2) with variable cross section, the steel skeleton beam (2) is embedded in the concrete secondary beam (1) and the concrete edge beam (4), the large cross section area of the steel skeleton beam (2) partially extends out of the concrete edge beam (4), and the length of the extending part is not more than 1m, the cross section of the large cross section area of the steel skeleton beam (2) is the same in size as the cantilever steel beam (3), the upper flange (300) of the cantilever steel beam and the lower flange (301) of the cantilever steel beam are respectively welded with the upper flange (200) and the lower flange (201) of the steel skeleton beam extending out of the concrete edge beam (4), and the web (302) of the cantilever steel beam is connected with the web (202) of the steel skeleton beam extending out of the concrete edge beam (4) through the connecting plate (5) and the bolt (6).

2. The steel structure cantilever beam and concrete beam connecting structure according to claim 1, characterized in that: The part of the steel skeleton beam (2) extending out of the concrete edge beam (4) and the top surface of the cantilever steel beam (3) are fixedly connected with the steel bar truss floor slab (8) through the first anchor nail (7), and the top surface of the steel bar truss floor slab (8) is in the same plane as the top surface of the concrete edge beam (4).

3. The structure of claim 1 or 2, wherein: The length of the web (202) of the steel skeleton beam extending out of the concrete edge beam (4) is 45-55cm, the length of the upper flange (200) of the steel skeleton beam is 65-75cm, and the length of the lower flange (201) of the steel skeleton beam is 25-35cm; the upper flange of the butt joint part of the cantilever steel beam (3) and the steel skeleton beam (2) is shorter than the web, the lower flange is longer than the web, and the length of the upper flange (300) and the lower flange (301) of the butt joint part of the cantilever steel beam matches the length of the upper flange (200) and the lower flange (201) of the steel skeleton beam extending out of the concrete edge beam (4); the upper flange (200) of the steel skeleton beam extending out of the concrete edge beam (4) is welded with the upper edge of the part of the web (202) of the steel skeleton beam and the part of the cantilever steel beam upper flange (300) which is longer than the cantilever steel beam web (302), and the lower flange (301) of the cantilever steel beam is welded with the lower edge of the part of the cantilever steel beam web (302) which is longer than the cantilever steel beam upper flange (300) and the part of the web (202) of the steel skeleton beam extending out of the concrete edge beam (4) which is longer than the lower flange (201) of the steel skeleton beam.

4. The structure of claim 1 or 2, wherein: A row of bolt holes (9) are respectively arranged at the butt joint parts of the web (202) of the steel skeleton beam extending out of the concrete edge beam (4) and the web (302) of the cantilever steel beam, and connecting plates (5) with bolt holes are respectively arranged at the two sides of the butt joint parts of the web (202) of the steel skeleton beam and the web (302) of the cantilever steel beam, and the web (202) of the steel skeleton beam and the web (302) of the cantilever steel beam are fixedly connected through the two connecting plates (5) and the plurality of bolts (6).

5. The steel structure cantilever beam and concrete beam connecting structure according to claim 1 or 2, characterized in that: The small cross section part of the steel skeleton beam (2) is embedded in the middle part of the concrete secondary beam (1), the large cross section part of the steel skeleton beam (2) is embedded in the middle part of the concrete edge beam (4), and the center lines of the steel skeleton beam (2), the concrete secondary beam (1), the concrete edge beam (4) and the cantilever steel beam (3) in the horizontal direction coincide.

6. The steel structure cantilever beam and concrete beam connecting structure according to claim 1 or 2, characterized in that: The width of the steel skeleton beam (2) and the cantilever steel beam (3) is the same, the height of the small section area of the steel skeleton beam (2) is 1 / 3-1 / 2 of the section height of the cantilever steel beam (3), and the height of the large section area of the steel skeleton beam (2) is equal to the section height of the cantilever steel beam (3).

7. The steel structure cantilever beam and concrete beam connecting structure according to claim 1 or 2, characterized in that: The terminal length of the concrete side beam (4) extending to the concrete secondary beam (1) from the side edge of the cantilever steel beam (3) to the steel skeleton beam (2) is recorded as the rooting length L, and the rooting length L is not less than 2.5 times of the section height of the cantilever steel beam (3).

8. The steel structure cantilever beam and concrete beam connecting structure according to claim 1 or 2, characterized in that: The steel skeleton beam (2) and the cantilever steel beam (3) both adopt I-beams, the upper flange (300) of the cantilever steel beam is equal in width and thickness to the upper flange (200) of the steel skeleton beam, and the lower flange (301) of the cantilever steel beam is equal in width and thickness to the lower flange (201) of the steel skeleton beam.

9. The steel structure cantilever beam and concrete beam connecting structure according to claim 1 or 2, characterized in that: Second anchor nails (10) are installed on the upper flange of the steel skeleton beam (2) at equal intervals; and the steel skeleton beam (2) is distributed with a plurality of stiffening rib plates (13).

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