A connection structure and construction method for a secondary beam lower than a primary beam

Abstract

The present invention relates to a connection structure and construction method for a secondary beam lower than a primary beam, belonging to the technical field of civil engineering. The connection structure includes symmetrically arranged primary beam steel bar assemblies, one group of the primary beam steel bar assemblies passing through symmetrically arranged perforated angle steels II, and the other group of the primary beam steel bar assemblies passing through steel bar connectors. The steel bar connectors are also provided with a secondary beam top steel bar assembly and a secondary beam bottom steel bar assembly. By arranging the steel bar connectors, the primary beam steel bar assemblies, the secondary beam top steel bar assembly and the secondary beam bottom steel bar assembly are connected to form a combined steel and steel bar framework, improving the load-bearing capacity of the primary beam; avoiding the phenomenon of sinking after stepping on the secondary beam top steel bar assembly, reducing and preventing the generation of horizontal cracks in the side concrete of the beam; during an earthquake, the secondary beam top steel bar assembly and the secondary beam bottom steel bar assembly are supported by the steel bar connectors and will not be pulled out, and the secondary beam will not collapse under the action of earthquake and vertical loads.

Description

Technical Field

[0001] The present invention belongs to the technical field of civil engineering and relates to a connection structure and a construction method for a secondary beam lower than a main beam. Background Art

[0002] During the construction process, the beam surface of the secondary beam in a building project is generally flush with the beam surface of the main beam. As Figure 7 Figure 8 shown, at this time, the secondary beam steel bars are placed above the main beam steel bars to ensure that the beam surfaces of the main beam and the secondary beam jointly bear the load. However, due to the diversification of buildings, in many cases, the beam surface of the secondary beam cannot be flush with the beam surface of the main beam, but is significantly lower than the beam surface of the main beam. Even as Figure 9 shown, there is an unfavorable situation where the bottom surface of the secondary beam is lower than the bottom surface of the main beam (i.e., a suspended secondary beam). When the load of the secondary beam 2 is large, this structural form is more unfavorable.

[0003] In the case where the bottom surface of the secondary beam is lower than the bottom surface of the main beam, if the construction method as Figure 8 shown is still adopted, the secondary beam steel bars cannot be placed above the main beam steel bars, and a favorable skeleton formed by the lap combination of the secondary beam steel bars and the main beam steel bars cannot be formed, resulting in the following disadvantages:

[0004] The secondary beam 2 is located in the tension zone of the main beam 1. The lower part of the main beam 1 is not only subjected to the horizontal tensile force along the beam axis direction, but also subjected to the vertical downward tensile force of the secondary beam 2. That is, the concrete of the main beam body is in a state of biaxial tensile stress. This stress state is completely different from the situation when the beam surfaces of the secondary beam and the main beam are flush, which greatly reduces the bearing capacity of the main beam 1.

[0005] During on-site construction, the secondary beam steel bars are easily displaced and sunk due to construction trampling, resulting in cracks at the edge of the secondary beam support. In particular, the bottom steel bars of the secondary beam cannot extend into the main beam body for anchoring. Over time, horizontal cracks 11 will appear in the upper part of the main beam body at the junction of the secondary beam 2 and the main beam 1, and diagonal cracks 12 at about 45 degrees will appear on both sides of the secondary beam 2. As Figure 10 shown, a "pull-off" or "tear" phenomenon of the main beam surface concrete is formed.

[0006] When a strong earthquake occurs, when the concrete of the main beam 1 and the secondary beam 2 cracks and falls off, due to the lack of the supporting effect of the main beam steel bar skeleton on the secondary beam steel bars, the secondary beam steel bars are easily pulled out and dropped from the main beam 1, causing the collapse of the secondary beam 2. Summary of the Invention

[0007] The purpose of the present invention is to provide a connection structure and construction method for a secondary beam lower than a main beam. By setting steel bar connectors, the main beam steel bar assembly, the top steel bar assembly of the secondary beam, and the bottom steel bar assembly of the secondary beam are connected to form a combined steel and steel bar skeleton, improving the bearing capacity of the main beam. By adopting the perforated angle steel one and the fixing assembly, the positioning of the top steel bar assembly and the bottom steel bar assembly of the secondary beam is more accurate, avoiding the sinking phenomenon after stepping on the top steel bar assembly of the secondary beam, effectively restraining the concrete at the junction of the main beam and the secondary beam, reducing and preventing the generation of horizontal cracks in the side concrete of the beam. The extended parts of the fixing assembly on both sides of the secondary beam (i.e., along the direction of the main beam) effectively resist the approximately 45-degree diagonal cracks on both sides of the main beam, limiting the width of the diagonal cracks and preventing them from developing towards the upper part of the beam. During an earthquake, due to the existence of the combined steel and steel bar skeleton, the top steel bar assembly and the bottom steel bar assembly of the secondary beam are supported by the steel bar connectors and will not be pulled out, and the secondary beam will not collapse under the action of earthquake and vertical loads.

[0008] The purpose of the present invention can be achieved through the following technical solutions:

[0009] A connection structure for a secondary beam lower than a main beam includes symmetrically arranged main beam steel bar assemblies. One group of the main beam steel bar assemblies passes through symmetrically arranged perforated angle steel two, and the other group of the main beam steel bar assemblies passes through steel bar connectors. The steel bar connectors are also penetrated by the top steel bar assembly and the bottom steel bar assembly of the secondary beam.

[0010] The steel bar connectors include symmetrically arranged perforated angle steel one and fixing assemblies arranged on the perforated angle steel one. Both the top steel bar assembly and the bottom steel bar assembly of the secondary beam pass through the perforated angle steel one, and the top steel bar assembly of the secondary beam is fixed again through the fixing assembly.

[0011] As a preferred technical solution of the present invention, one end of the top steel bar assembly of the secondary beam close to the perforated angle steel two is bent downward, and the bent part of the top steel bar assembly of the secondary beam abuts against the inner edge of the vertical flange of the perforated angle steel two.

[0012] As a preferred technical solution of the present invention, the fixing assembly includes a supporting flat steel one and a fixing flat steel one. The supporting flat steel one is welded on the perforated angle steel one. The fixing flat steel one is provided with fixing screw hole parts. The supporting flat steel one is provided with fixing screws matching the fixing screw hole parts. The fixing screws pass through the corresponding fixing screw hole parts and are connected with fastening nuts. The top steel bar assembly of the secondary beam is located between the supporting flat steel one and the fixing flat steel one.

[0013] As a preferred technical solution of the present invention, both the supporting flat steel one and the fixing flat steel one are provided with steel teeth on the side close to the top steel bar assembly of the secondary beam.

[0014] As a preferred technical solution of the present invention, the secondary beam top steel bar assembly includes a secondary beam top steel bar one and secondary beam top steel bars two symmetrically arranged on both sides of the secondary beam top steel bar one. The secondary beam top steel bar one passes through the gap between two perforated angle steels one and abuts against the inner edge of the vertical flange of the perforated angle steel two. The two secondary beam top steel bars two respectively pass through the corresponding perforated angle steels one and abut against the inner edge of the vertical flange of the perforated angle steel two;

[0015] The bottoms of the two perforated angle steels two are welded with a supporting flat steel three;

[0016] The secondary beam bottom steel bar assembly includes a secondary beam bottom steel bar one and secondary beam bottom steel bars two symmetrically arranged on both sides of the secondary beam bottom steel bar one. The secondary beam bottom steel bar one passes through the gap between two perforated angle steels one and abuts against the inner edge of the vertical flange of the perforated angle steel two. The two secondary beam bottom steel bars two respectively pass through the corresponding perforated angle steels one and are placed above the supporting flat steel three.

[0017] As a preferred technical solution of the present invention, a supporting flat steel two is welded on the perforated angle steel one, and one end of the secondary beam bottom steel bar one close to the perforated angle steel two is bent upward and passes through the supporting flat steel two.

[0018] As a preferred technical solution of the present invention, a fixing flat steel two is welded on the side of the perforated angle steel two away from the steel bar connecting piece.

[0019] As a preferred technical solution of the present invention, through holes are symmetrically arranged on both sides of the fixing flat steel one and the fixing flat steel two.

[0020] A construction method for a secondary beam lower than the main beam includes the following steps:

[0021] S1: Bind the main beam steel bar assembly, set the perforated angle steel one and the perforated angle steel two at the position where the secondary beam intersects. Pass the two groups of main beam steel bar assemblies through the perforated angle steel one and the perforated angle steel two respectively, and pass the secondary beam top steel bar two through the corresponding perforated angle steel one;

[0022] S2: Weld the supporting flat steel one, the supporting flat steel two, the supporting flat steel three and the fixing flat steel two to the designated positions;

[0023] S3: Pass the secondary beam bottom steel bar one through the supporting flat steel two and the gap between the two perforated angle steels one, and pass the two secondary beam bottom steel bars two through the corresponding perforated angle steels one respectively and place them on the supporting flat steel three;

[0024] S4: Pass the secondary beam top steel bar one through the gap between the two perforated angle steels one, and make the bent part of the secondary beam top steel bar one abut against the inner edge of the vertical flange of the perforated angle steel two;

[0025] S5: Align the fixing screw with the corresponding fixing screw hole component, and move the first fixing flat steel downward until it stops when the first fixing flat steel clamps the top steel bar assembly of the secondary beam. Then fix the fixing screw and the fixing screw hole component with a fastening nut.

[0026] S6: Pour the concrete of the main beam and the secondary beam to complete the construction.

[0027] Advantages of the present invention:

[0028] (1) By providing the steel bar connecting piece, the main beam steel bar assembly, the top steel bar assembly of the secondary beam and the bottom steel bar assembly of the secondary beam are connected to form a combined steel and steel bar skeleton, improving the bearing capacity of the main beam. The top steel bar assembly of the secondary beam and the bottom steel bar assembly of the secondary beam transfer part of the gravity load borne by the secondary beam to the main beam steel bar assembly and the upper area of the main beam through the steel bar connecting piece. The upper area of the main beam belongs to the compression zone, and its bearing capacity is significantly higher than the tensile state when directly suspended at the bottom of the main beam.

[0029] (2) By using the first perforated angle steel and the fixing component, the positioning of the top steel bar assembly of the secondary beam and the bottom steel bar assembly of the secondary beam is more accurate, avoiding the sinking phenomenon after the top steel bar assembly of the secondary beam is trampled. The first perforated angle steel can not only effectively transfer the stress of the top steel bar assembly of the secondary beam, the bottom steel bar assembly of the secondary beam and the vertical force of the secondary beam, but also effectively restrain the concrete at the intersection of the main beam and the secondary beam, reducing and preventing the generation of horizontal cracks on the side of the beam. The extended parts of the fixing component on both sides of the secondary beam (i.e., along the direction of the main beam) pass through the nearly 45-degree diagonal cracks on both sides of the secondary beam. That is, the diagonal cracks appearing on the main beam body are effectively shear-resistant by the fixing component inside the main beam, restricting the width of the diagonal cracks and preventing them from developing towards the upper part of the beam body, improving the bearing capacity and durability of the main beam.

[0030] (3) During an earthquake, even if the concrete of the main beam and the secondary beam cracks and falls off, due to the existence of the combined steel and steel bar skeleton, the top steel bar assembly of the secondary beam and the bottom steel bar assembly of the secondary beam will not be pulled out under the support of the steel bar connecting piece, and the secondary beam will not collapse under the action of earthquake and vertical load. Description of the drawings

[0031] For the convenience of those skilled in the art to understand, the present invention will be further described below with reference to the drawings.

[0032] Figure 1 It is the front view cross-sectional view of the connection relationship between the main beam and the secondary beam;

[0033] Figure 2 Top view of the positional relationship among the first perforated angle steel, the second perforated angle steel, the first fixing flat steel and the second fixing flat steel;

[0034] Figure 3It is a three-dimensional view of the positional relationship between the top steel bar assembly of the secondary beam, the bottom steel bar assembly of the secondary beam and one set of main beam steel bar assemblies;

[0035] Figure 4 It is a three-dimensional view of the positional relationship between the top steel bar assembly of the secondary beam, the bottom steel bar assembly of the secondary beam and the other set of main beam steel bar assemblies;

[0036] Figure 5 It is a structural schematic diagram of the first fixed flat steel, the second fixed flat steel, the first supporting flat steel, the second supporting flat steel and the third supporting flat steel;

[0037] Figure 6 It is a structural schematic diagram of the fixed screw hole part, the fixed screw and the fastening nut;

[0038] Figure 7 It is a structural schematic diagram of the secondary beam surface being flush with the main beam surface;

[0039] Figure 8 It is an internal structural schematic diagram of the construction method of the prior art;

[0040] Figure 9 It is a structural schematic diagram of the secondary beam surface being lower than the main beam surface;

[0041] Figure 10 It is a schematic diagram of the horizontal crack and the diagonal crack on the main beam surface;

[0042] Explanation of main component symbols:

[0043] In the figure: 1. Main beam; 11. Horizontal crack; 12. Diagonal crack; 2. Secondary beam; 3. Main beam steel bar assembly; 4. Second perforated angle steel; 5. Steel bar connecting piece; 51. First perforated angle steel; 52. Fixed assembly; 521. First supporting flat steel; 522. First fixed flat steel; 523. Fixed screw hole part; 524. Fixed screw; 525. Fastening nut; 53. Second supporting flat steel; 6. Top steel bar assembly of the secondary beam; 61. First top steel bar of the secondary beam; 62. Second top steel bar of the secondary beam; 7. Bottom steel bar assembly of the secondary beam; 71. First bottom steel bar of the secondary beam; 72. Second bottom steel bar of the secondary beam; 8. Third supporting flat steel; 9. Second fixed flat steel; 91. Through hole. Specific implementation manners

[0044] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following, in combination with the accompanying drawings and preferred embodiments, details the specific implementation manners, structures, features and their effects of the present invention as follows.

[0045] Please refer to Figures 1-6As shown in the figure, a connection structure where the secondary beam is lower than the primary beam includes symmetrically arranged primary beam steel bar assemblies 3. One group of the primary beam steel bar assemblies 3 passes through symmetrically arranged perforated angle steels two 4, and the other group of the primary beam steel bar assemblies 3 passes through steel bar connectors 5. The steel bar connectors 5 are also provided with a secondary beam top steel bar assembly 6 and a secondary beam bottom steel bar assembly 7 passing through them.

[0046] The steel bar connectors 5 include symmetrically arranged perforated angle steels one 51 and fixing assemblies 52 arranged on the perforated angle steels one 51. Both the secondary beam top steel bar assembly 6 and the secondary beam bottom steel bar assembly 7 pass through the perforated angle steels one 51, and the secondary beam top steel bar assembly 6 is fixed again through the fixing assemblies 52.

[0047] In this embodiment, the primary beam steel bar assemblies 3 include primary beam top steel bars and primary beam bottom steel bars. By setting the steel bar connectors 5, the primary beam steel bar assemblies 3, the secondary beam top steel bar assembly 6, and the secondary beam bottom steel bar assembly 7 are connected to form a combined steel and steel bar skeleton, achieving an effect that the original construction method does not have:

[0048] ① By setting the steel bar connectors 5, the load-bearing capacity of the primary beam 1 is improved. The secondary beam top steel bar assembly 6 and the secondary beam bottom steel bar assembly 7 transfer part of the gravity load borne by the secondary beam 2 to the primary beam steel bar assemblies 3 and the upper region of the primary beam 1 through the steel bar connectors 5. The upper region of the primary beam 1 belongs to the compression zone, and its load-bearing capacity is significantly higher than the tensile state when directly suspended at the bottom of the primary beam 1.

[0049] ② By using the perforated angle steels one 51 and the fixing assemblies 52, the positioning of the secondary beam top steel bar assembly 6 and the secondary beam bottom steel bar assembly 7 is more accurate, avoiding the sinking phenomenon after the secondary beam top steel bar assembly 6 is stepped on. The perforated angle steels one 51 can not only effectively transfer the stress of the secondary beam top steel bar assembly 6 and the secondary beam bottom steel bar assembly 7 and the vertical force of the secondary beam 2, but also effectively restrain the concrete at the junction of the primary beam 1 and the secondary beam 2, reducing and preventing the generation of horizontal cracks in the beam side concrete.

[0050] ③ During an earthquake, even if the concrete of the primary beam 1 and the secondary beam 2 cracks and falls off, due to the existence of the combined steel and steel bar skeleton, the secondary beam top steel bar assembly 6 and the secondary beam bottom steel bar assembly 7 are supported by the steel bar connectors 5 and will not be pulled out, and the secondary beam 2 will not collapse under the action of earthquake and vertical load.

[0051] Specifically, one end of the secondary beam top steel bar assembly 6 close to the perforated angle steels two 4 is bent downward, and the bent part of the secondary beam top steel bar assembly 6 abuts against the inner edge of the vertical flange of the perforated angle steels two 4.

[0052] The fixing component 52 includes a first supporting flat steel 521 and a first fixing flat steel 522. The first supporting flat steel 521 is welded to the first perforated angle steel 51. A fixing screw hole part 523 is arranged on the first fixing flat steel 522, and a fixing screw 524 matching the fixing screw hole part 523 is arranged on the first supporting flat steel 521. The fixing screw 524 passes through the corresponding fixing screw hole part 523 and is connected with a fastening nut 525. The secondary beam top steel bar assembly 6 is located between the first supporting flat steel 521 and the first fixing flat steel 522.

[0053] Steel teeth are provided on one side of the first supporting flat steel 521 and the first fixing flat steel 522 close to the secondary beam top steel bar assembly 6.

[0054] A second fixing flat steel 9 is welded to one side of the second perforated angle steel 4 away from the steel bar connecting piece 5.

[0055] Through holes 91 are symmetrically arranged on both sides of the first fixing flat steel 522 and the second fixing flat steel 9.

[0056] In this embodiment, steel teeth are provided on all four sides of the first fixing flat steel 522 and the second fixing flat steel 9.

[0057] One end of the secondary beam top steel bar assembly 6 close to the second perforated angle steel 4 is bent downward to form further protection for the secondary beam top steel bar assembly 6, and the safety factor is higher.

[0058] The first supporting flat steel 521 and the first perforated angle steel 51 position the secondary beam top steel bar assembly 6 and form a strong support, effectively avoiding the sinking phenomenon occurring after the secondary beam top steel bar assembly 6 is trampled during construction, and overcoming the defect of cracking at the junction of the secondary beam 2 and the main beam 1.

[0059] When it is necessary to fix the secondary beam top steel bar assembly 6, the fixing screw 524 is passed through the corresponding fixing screw hole part 523 and locked with the fastening nut 525. At this time, the steel teeth on the first fixing flat steel 522 and the first supporting flat steel 521 clamp the secondary beam top steel bar assembly 6. By providing steel teeth, not only can the first supporting flat steel 521 and the first fixing flat steel 522 form an effective clamping connection to the secondary beam top steel bar assembly 6, but also the first supporting flat steel 521 and the first fixing flat steel 522 can form an effective bite and bond with the surrounding concrete, enhancing the integrity of the first supporting flat steel 521, the first fixing flat steel 522, the secondary beam top steel bar assembly 6 and the concrete, making the combined skeleton formed by the secondary beam top steel bar assembly 6, the steel bar connecting piece 5 and the main beam steel bar assembly 3 more stable. When an earthquake occurs, it is very difficult for the secondary beam top steel bar assembly 6 to be pulled out and fall off from the steel teeth, ensuring the safety of the secondary beam 2 during an earthquake.

[0060] Fix the flat steel two 9 by welding, and open through holes 91 on the flat steel one 522 and the flat steel two 9. The concrete on the inner and outer sides of the flat steel one 522 and the flat steel two 9 is tightly combined through the through holes 91, enhancing the integrity of the flat steel one 522, the flat steel two 9 and the concrete of the main beam 1.

[0061] Since the tensile and shear resistance capacities of steel are more than a hundred times that of concrete, the flat steel one 522 and the flat steel two 9 improve the bearing capacity and durability of the main beam 1. The extended parts of the flat steel one 522 and the flat steel two 9 on both sides of the secondary beam 2 (i.e., along the direction of the main beam 1) cross the nearly 45-degree diagonal cracks 12 on both sides of the secondary beam 2, restricting the width of the diagonal cracks 12 and preventing them from developing towards the upper part of the beam body; when fine horizontal cracks 11 appear on the concrete surface, the flat steel one 522 and the flat steel two 9 effectively prevent the fine horizontal cracks 11 from developing towards the inside of the beam body.

[0062] Specifically, the secondary beam top steel bar assembly 6 includes a secondary beam top steel bar one 61 and secondary beam top steel bars two 62 symmetrically arranged on both sides of the secondary beam top steel bar one 61. The secondary beam top steel bar one 61 passes through the gap between the two perforated angle steels one 51 and abuts against the inner edge of the vertical flange of the perforated angle steel two 4. The two secondary beam top steel bars two 62 respectively pass through the corresponding perforated angle steels one 51 and abut against the inner edge of the vertical flange of the perforated angle steel two 4;

[0063] The bottom of the two perforated angle steels two 4 is welded with a supporting flat steel three 8;

[0064] The secondary beam bottom steel bar assembly 7 includes a secondary beam bottom steel bar one 71 and secondary beam bottom steel bars two 72 symmetrically arranged on both sides of the secondary beam bottom steel bar one 71. The secondary beam bottom steel bar one 71 passes through the gap between the two perforated angle steels one 51 and abuts against the inner edge of the vertical flange of the perforated angle steel two 4. The two secondary beam bottom steel bars two 72 respectively pass through the corresponding perforated angle steels one 51 and are placed above the supporting flat steel three 8.

[0065] A supporting flat steel two 53 is welded on the perforated angle steel one 51. One end of the secondary beam bottom steel bar one 71 close to the perforated angle steel two 4 is bent upwards and passes through the supporting flat steel two 53.

[0066] In this embodiment, the flange width of the perforated angle steel one 51 is limited, and the number of steel bar passing holes opened at the position corresponding to the secondary beam 2 is also limited. Therefore, the secondary beam top steel bar one 61 passes through the gap between the two perforated angle steels one 51 and is fixed by the fixing assembly 52.

[0067] Weld the supporting flat steel 3-8 at the bottom of the perforated angle steel 2-4. The perforated angle steel 2-4 and the supporting flat steel 3-8 form an "L"-shaped steel edge, which can not only effectively support the secondary beam bottom steel bar assembly 7, but also better restrain the concrete at the increased part of the bottom of the main beam 1 (i.e., the suspended part of the main beam 1), improving the bearing capacity and crack resistance of the main beam 1.

[0068] During the construction of the present invention, the following steps are included:

[0069] S1: Bind the main beam steel bar assembly 3, set the perforated angle steel 1-51 and the perforated angle steel 2-4 at the intersection part with the secondary beam 2, open steel bar passing holes on the perforated angle steel 1-51 and the perforated angle steel 2-4, pass the main beam steel bar assembly 3 through the steel bar passing holes on the perforated angle steel 1-51 and the perforated angle steel 2-4, pass the secondary beam top steel bar 2-62 through the steel bar passing hole on the corresponding perforated angle steel 1-51 and make the bent part thereof abut against the inner edge of the vertical flange of the perforated angle steel 2-4;

[0070] S2: Weld the supporting flat steel 1-521, the supporting flat steel 2-53, the supporting flat steel 3-8 and the fixing flat steel 2-9 to the designated positions; the upper edge of the supporting flat steel 1-521 is flush with the bottom of the steel bar passing hole of the secondary beam top steel bar 2-62 opened on the perforated angle steel 1-51, the lower edge of the supporting flat steel 2-53 is flush with the top of the steel bar passing hole of the secondary beam bottom steel bar 2-72 opened on the perforated angle steel 1-51, weld the supporting angle flat steel 3 to the bottom of the perforated angle steel 2-4, weld the fixing flat steel 2-9 on the side of the perforated angle steel 2-4 away from the secondary beam top steel bar 2-62, and the lower tooth bottom surface of the fixing flat steel 2-9 is flush with the top of the steel bar passing hole of the secondary beam top steel bar 2-62 opened on the perforated angle steel 1-51;

[0071] S3: Pass the secondary beam bottom steel bar 1-71 through the space between the supporting flat steel 2-53 and the two perforated angle steels 1-51, and pass the secondary beam bottom steel bar 2-72 through the corresponding perforated angle steel 1-51 and place it on the supporting flat steel 3-8;

[0072] S4: Pass the secondary beam top steel bar 1-61 through the space between the two perforated angle steels 1-51, and make the bent part of the secondary beam top steel bar 1-61 abut against the inner edge of the vertical flange of the perforated angle steel 2-4;

[0073] S5: Align the fixing screw 5-24 with the corresponding fixing screw hole part 5-23, and move the fixing flat steel 1-522 downward until the fixing flat steel 1-522 clamps the secondary beam top steel bar assembly 6, and then fix the fixing screw 5-24 and the fixing screw hole part 5-23 through the fastening nut 5-25;

[0074] S6: Pour the concrete of the main beam 1 and the secondary beam 2 to complete the construction.

[0075] The above are only the preferred embodiments of the present invention and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments by using the above-disclosed technical content within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any brief modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A connection structure with secondary beams lower than main beams, including symmetrically arranged main beam steel bar assemblies (3), characterized in that: One group of the main beam steel bar assemblies (3) passes through the symmetrically arranged perforated angle steel two (4), and the other group of the main beam steel bar assemblies (3) passes through the steel bar connecting piece (5). The secondary beam top steel bar assembly (6) and the secondary beam bottom steel bar assembly (7) are also arranged through the steel bar connecting piece (5); The steel bar connecting piece (5) includes symmetrically arranged perforated angle steel one (51) and a fixing assembly (52) arranged on the perforated angle steel one (51). Both the secondary beam top steel bar assembly (6) and the secondary beam bottom steel bar assembly (7) pass through the perforated angle steel one (51), and the secondary beam top steel bar assembly (6) is fixed again through the fixing assembly (52); One end of the secondary beam top steel bar assembly (6) close to the perforated angle steel two (4) is bent downward, and the bent part of the secondary beam top steel bar assembly (6) abuts against the inner edge of the vertical flange of the perforated angle steel two (4).

2. The connecting structure with the secondary beam lower than the primary beam according to claim 1, wherein: The fixing assembly (52) includes a supporting flat steel one (521) and a fixing flat steel one (522). The supporting flat steel one (521) is welded on the perforated angle steel one (51). The fixing flat steel one (522) is provided with a fixing screw hole part (523). The supporting flat steel one (521) is provided with a fixing screw (524) matching the fixing screw hole part (523). The fixing screw (524) passes through the corresponding fixing screw hole part (523) and is connected with a fastening nut (525). The secondary beam top steel bar assembly (6) is located between the supporting flat steel one (521) and the fixing flat steel one (522).

3. The connecting structure with the secondary beam lower than the primary beam according to claim 2, characterized in that: Both the supporting flat steel one (521) and the fixing flat steel one (522) are provided with steel teeth on the side close to the secondary beam top steel bar assembly (6).

4. A connection structure in which the secondary beam is lower than the primary beam according to claim 1, characterized in that: The secondary beam top steel bar assembly (6) includes a secondary beam top steel bar one (61) and secondary beam top steel bars two (62) symmetrically arranged on both sides of the secondary beam top steel bar one (61). The secondary beam top steel bar one (61) passes through the gap between the two perforated angle steel one (51) and abuts against the inner edge of the vertical flange of the perforated angle steel two (4). The two secondary beam top steel bars two (62) respectively pass through the corresponding perforated angle steel one (51) and abut against the inner edge of the vertical flange of the perforated angle steel two (4); The bottoms of the two perforated angle steel two (4) are welded with a supporting flat steel three (8); The secondary beam bottom steel bar assembly (7) includes a secondary beam bottom steel bar one (71) and secondary beam bottom steel bars two (72) symmetrically arranged on both sides of the secondary beam bottom steel bar one (71). The secondary beam bottom steel bar one (71) passes through the gap between the two perforated angle steel one (51) and abuts against the inner edge of the vertical flange of the perforated angle steel two (4). The two secondary beam bottom steel bars two (72) respectively pass through the corresponding perforated angle steel one (51) and are placed above the supporting flat steel three (8).

5. A connecting structure in which the secondary beam is lower than the primary beam according to claim 4, characterized in that: A supporting flat steel two (53) is welded on the perforated angle steel one (51). One end of the secondary beam bottom steel bar one (71) close to the perforated angle steel two (4) is bent upward and passes through the supporting flat steel two (53).

6. The connecting structure with the secondary beam lower than the primary beam according to claim 2, characterized in that: A fixing flat steel two (9) is welded on the side of the perforated angle steel two (4) away from the steel bar connecting piece (5).

7. A connection structure in which the secondary beam is lower than the primary beam according to claim 6, characterized in that: Both sides of the fixing flat steel one (522) and the fixing flat steel two (9) are symmetrically provided with through holes (91).

8. A construction method for a connection structure where the secondary beam is lower than the primary beam, based on the connection structure where the secondary beam is lower than the primary beam according to any one of claims 1-7, characterized in that: It includes the following steps: S1: Bind the main beam steel bar assembly (3), set the first perforated angle steel (51) and the second perforated angle steel (4) at the intersection with the secondary beam (2), pass the two groups of main beam steel bar assemblies (3) through the first perforated angle steel (51) and the second perforated angle steel (4) respectively, and pass the second top steel bar of the secondary beam (62) through the corresponding first perforated angle steel (51); S2: Weld the first supporting flat steel (521), the second supporting flat steel (53), the third supporting flat steel (8) and the second fixing flat steel (9) to the specified positions; S3: Pass the first bottom steel bar of the secondary beam (71) through the second supporting flat steel (53) and the gap between the two first perforated angle steels (51), and pass the two second bottom steel bars of the secondary beam (72) through the corresponding first perforated angle steels (51) respectively and place them on the third supporting flat steel (8); S4: Pass the first top steel bar of the secondary beam (61) through the gap between the two first perforated angle steels (51), and make the bent part of the first top steel bar of the secondary beam (61) abut against the inner edge of the vertical flange of the second perforated angle steel (4); S5: Align the fixing screw (524) with the corresponding fixing screw hole part (523), and move the first fixing flat steel (522) downward until the first fixing flat steel (522) stops when it clamps the top steel bar assembly of the secondary beam (6), and then fix the fixing screw (524) and the fixing screw hole part (523) through the fastening nut (525); S6: Pour the concrete of the main beam (1) and the secondary beam (2) to complete the construction.

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