A non-embedded cantilever steel beam and its strengthening structure

Abstract

The present invention belongs to the technical field of building construction, and particularly relates to a non-embedded cantilever steel beam and its reinforcement structure, including a cantilever steel beam, channel steel one, channel steel two, a tightening member, a triangular steel plate, a rectangular hollow diagonal brace, a floor slab, and a beam. The end of the floor slab is perpendicularly connected to the end of the beam; one end of the cantilever steel beam is horizontally close to the floor slab, and the cantilever steel beam is fixed by using a rectangular hollow diagonal brace, channel steel one, channel steel two, a tightening member, and a triangular steel plate. The tightening member in the present invention can be finely adjusted by bolts to meet the installation accuracy requirements. When the connection between the channel steel and the floor slab fails, the rectangular truss diagonal brace and the triangular steel plate of the present invention eliminate the danger of the original non-embedded cantilever steel beam falling when it is damaged, which not only ensures the safety of the ground staff but also allows the workers to have enough time for maintenance. Since the channel steel can ensure the force transmission between each cantilever steel beam and can also resist the horizontal shear force generated by the scaffold in strong winds, the strength and stiffness of the cantilever steel beam are also improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of building construction, and particularly relates to a non-embedded cantilever steel beam and its strengthening structure. Background Art

[0002] The cantilever steel beam serves as the base of the cantilever scaffold. However, in the existing technology, this non-embedded cantilever steel beam is only connected by two bolts at the top, and the bolts are fixed in the concrete by the embedded method. Since the concrete at different positions may have slightly different strengths due to reasons such as water-cement ratio or uneven vibration, this directly leads to different strengths that the bolts at different positions can withstand. Installing only two bolts at the top may cause the cantilever steel beam to be damaged. And in many projects, a seven-story overhang is selected. When the cantilever steel beam fixed by only two bolts is damaged and falls from the seventh floor, it will pose a safety threat to the construction workers downstairs. Summary of the Invention

[0003] In order to solve the above existing technical problems, the present invention provides a non-embedded cantilever steel beam and its strengthening structure. The main purpose is to develop a cantilever structure that can be prefabricated in advance, is convenient to install, has precise installation, is convenient to disassemble, and has better mechanical properties. It can effectively increase the strength of the fixed end of the cantilever steel beam, also increase the overall strength and stiffness of the cantilever steel beam, enable each cantilever steel beam to participate in the force together, increase the lateral shear resistance of each other, avoid perforating the wall to place the cantilever steel beam, thereby reducing the damage to the wall, and effectively solve the safety hazard of the non-embedded cantilever steel beam being damaged and falling, ensuring the safety of the ground staff.

[0004] The technical solution adopted by the present invention is as follows:

[0005] A non-embedded cantilever steel beam strengthening structure includes a cantilever steel beam, channel steel one, channel steel two, a tightening member, a triangular steel plate, a rectangular hollow diagonal brace, a floor slab, and a beam;

[0006] The end of the floor slab is vertically connected to the end of the beam;

[0007] One end of the cantilever steel beam is horizontally close to the floor slab, and the cantilever steel beam is fixed by a rectangular hollow diagonal brace, channel steel one, channel steel two, a tightening member, and a triangular steel plate;

[0008] The width of the triangular steel plate is the same as that of the cantilever steel beam, and it is hollow in the middle. The upper surface where one of the right-angled sides of the triangular steel plate is located is fully welded to the bottom of the cantilever steel beam, and the surface where the other right-angled side is located is tightly connected to the beam through two bolts I reserved in the beam. The bolt I penetrates through the entire beam. The outer surface where the hypotenuse of the triangular steel plate is located is fully welded to the rectangular hollow brace; the width of the rectangular hollow brace is also the same as that of the cantilever steel beam, and one end of the rectangular hollow brace is fixed to the cantilever steel beam through two bolts III arranged on the cantilever steel beam, and the other end of the rectangular hollow brace is fixed to the beam through four bolts II arranged on both sides of the beam, and the bolt II penetrates through the entire beam;

[0009] Channel steel I and channel steel II are vertically arranged between adjacent I-beam webs. Channel steel is arranged at the position where the end of the cantilever beam contacts the floor, and the channel steel is connected to the floor through bolt VI, and the channel steel is closely attached to the floor;

[0010] Channel steel is vertically arranged at the top where the I-beam contacts the rectangular hollow brace;

[0011] The tightening member is arranged at the middle position of the triangular steel plate, and the tightening member connects the triangular steel plate and the cantilever steel beam; the tightening member is a U-shaped base that sleeves the triangular steel plate and the cantilever steel beam. The rectangular steel plate passes through the ends of the two vertical plates on the tightening member and is fixed through bolt V;

[0012] Several bolts IV pass through the holes on the two vertical plates of the tightening member and abut against the web of the cantilever steel beam.

[0013] Furthermore, each channel steel is connected to the floor through four bolts, and the bolts are embedded in the floor.

[0014] Furthermore, the longitudinal steel bars and stirrups in the beam are arranged perpendicular to each other inside the beam, and the floor top reinforcement and floor bottom reinforcement are arranged perpendicular to each other inside the floor.

[0015] The bolts connecting the triangular steel plate and the beam penetrate through the beam through the sleeves reserved during formwork erection, and the bolts connecting the rectangular hollow brace and the beam penetrate through the beam through the sleeves reserved during formwork erection.

[0016] Advantages of the present invention:

[0017] Compared with the prior art, the effects and advantages of the present invention are as follows:

[0018] 1) It is convenient to install and disassemble, has better mechanical properties, and can also increase the strength of the cantilever steel beam.

[0019] 2) There is no connection between the cantilever steel beam of the present invention and the floor, and the other components connected to the beam are all arranged with bolts through the reserved bolt sleeves to penetrate through the entire beam. The bolts can be reused, saving costs.

[0020] 3) The installation position of the cantilever steel beam of the present invention is on the same plane as the floor slab. In this way, when reserving holes for the channel steel, workers can more accurately locate the positions of the reserved holes, and the construction positions are more precise.

[0021] 4) In the present invention, the channel steel can ensure the force transmission between each cantilever steel beam and can also resist the horizontal shear force generated by the scaffold in strong winds, so the strength and stiffness of the cantilever steel beam are also improved.

[0022] 5) The triangular steel plate and the rectangular hollow diagonal brace can effectively increase the strength of the fixed end of the cantilever steel beam and can also reduce the torsional instability phenomenon of the cantilever steel beam due to the force position problem. Therefore, the present invention can improve the overall strength and stiffness of the cantilever steel beam and can effectively solve the safety hazard of the non-embedded cantilever steel beam falling due to insufficient bearing capacity.

[0023] 6) When installing the cantilever steel beam, the cantilever steel beam tightened by the tightening member in the present invention can be horizontally fine-tuned through bolts to meet the installation accuracy requirements.

[0024] 7) In the present invention, the channel steel can ensure the force transmission between each cantilever steel beam, improve the overall bearing capacity, and can also resist the horizontal shear force generated by the scaffold in strong winds, so the stiffness of the cantilever steel beam is also improved.

[0025] 8) The non-embedded cantilever steel beam in the present invention has no connection with the floor slab and does not need to pass through the wall, avoiding wall holes, reducing the use of bolts, and maintaining the integrity of the wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a top view of the overall structure on the nth floor slab;

[0027] Figure 2 It is an anchorage diagram of the overall structure in the floor slab;

[0028] Figure 3 It is a right view of any cantilever structure;

[0029] Figure 4 It is a reinforcement drawing of the floor slab and the beam;

[0030] Figure 5 It is a sectional view taken along line A-A;

[0031] Figure 6 A three-dimensional view of the cantilever steel beam and its strengthening structure;

[0032] In the figure, 1 is the floor slab, 2 is the cantilever steel beam, 3 is the rectangular hollow diagonal brace, 4 is the triangular steel plate, 5 is bolt one, 6 is bolt two, 7 is bolt three, 8 is the tightening piece, 9 is the longitudinal steel bars in the beam, 10 is the top reinforcement of the floor slab, 11 is the bottom reinforcement of the floor slab, 12 is the stirrup, 13 is the beam, 14 is the channel steel, 15 is the rectangular steel plate, 16 is bolt four, 17 is the external scaffolding, 18 is bolt five, 19 is the channel steel, 20 is bolt six. Specific implementation mode

[0033] The present invention will be described in detail below with reference to the accompanying drawings and embodiments:

[0034] Embodiment: As Figures 1 to 6 shown, a non-embedded cantilever steel beam strengthening structure includes a cantilever steel beam 2, channel steel one 14, channel steel two 19, a tightening piece 8, a triangular steel plate 4, a rectangular hollow diagonal brace 3, a floor slab 1, and a beam 13.

[0035] The end of the floor slab 1 is vertically connected to the end of the beam 13.

[0036] One end of the cantilever steel beam 2 is horizontally close to the floor slab 1, and the cantilever steel beam 2 is fixed by using a rectangular hollow diagonal brace 3, channel steel one 14, channel steel two 19, a tightening piece 8, and a triangular steel plate 4.

[0037] The width of the triangular steel plate 4 is the same as that of the cantilever steel beam 2, and it is hollow in the middle. The upper surface where one of the right-angled sides of the triangular steel plate 4 is located is fully welded to the bottom of the cantilever steel beam 2, and the surface where the other right-angled side is located is tightly connected to the beam 13 through two bolt ones 5 reserved in the beam 13. The bolt one 5 penetrates through the entire beam 13. The outer surface where the hypotenuse of the triangular steel plate 4 is located is fully welded to the rectangular hollow diagonal brace 3. The width of the rectangular hollow diagonal brace 3 is also the same as that of the cantilever steel beam 2. One end of the rectangular hollow diagonal brace 3 is fixed to the cantilever steel beam 2 through two bolt threes 7 arranged on the cantilever steel beam 2, and the other end of the rectangular hollow diagonal brace 3 is fixed to the beam 13 through four bolt twos 6 arranged on both sides of the beam 13, and the bolt two 6 penetrates through the entire beam 13.

[0038] Channel steel one 14 and channel steel two 19 are vertically arranged between the webs of adjacent I-beams 2. Channel steel 14 is arranged at the position where the end of the cantilever beam 2 contacts the floor slab 1, and the channel steel 14 is connected to the floor slab 1 through bolt six 20, and the channel steel 14 is close to the floor slab 1.

[0039] Channel steel 19 is vertically arranged at the top where the I-beam 2 contacts the rectangular hollow diagonal brace 3.

[0040] The tightening piece 8 is arranged at the middle position of the triangular steel plate 4, and the tightening piece 8 connects the triangular steel plate 4 and the cantilever steel beam 2. The tightening piece 8 is a U-shaped base that sleeves the triangular steel plate 4 and the cantilever steel beam 2. The rectangular steel plate 15 passes through the ends of the two vertical plates of the tightening piece 8 and is fixed through bolt five 18.

[0041] A number of bolts 16 pass through the holes in the two vertical plates of the tightening member 8 and abut against the web of the cantilever steel beam 2.

[0042] Each channel steel 14 is connected to the floor slab 1 by four bolts 8, and the bolts 8 are embedded in the floor slab 1.

[0043] For the longitudinal steel bars 9 and stirrups 12 in the beam, they are arranged perpendicular to each other inside the beam 13, and the top reinforcement 10 and bottom reinforcement 11 of the floor slab are arranged perpendicular to each other inside the floor slab 1.

[0044] A construction method for a non-embedded cantilever steel beam strengthening structure, comprising the following steps:

[0045] First, fasten the triangular steel plate 4 and the rectangular hollow diagonal brace 3 through the bolts 5 and 6 passing through the beam 13. Then place the cantilever steel beam 2. When placing, connect the cantilever steel beam 2 and the triangular steel plate 4 through the bolt 18 of the tightening member 8. Then adjust the cantilever steel beam 2 to a proper position through the fine-tuning bolt 16, and then perform welding. Finally, tighten the bolt 7 at the rectangular hollow diagonal brace 3. Then place the channel steel 14 between the flanges on the side of the cantilever steel beam 2 close to the floor slab 1, and fix the channel steel 14 through the bolt 20 embedded in the floor slab 1. At the same time, weld the contact surface between the channel steel 14 and the flange. However, at the building corner, the channel steel 14 is arranged obliquely, has no bolt connection with the floor slab 1, and welds the contact surface with the flange of the cantilever steel beam 2. Repeat these processes until all the cantilever steel beams 2 are installed. Finally, the cantilever steel beam 2 supports the external scaffold 17.

[0046] The above is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A non-embedded cantilever steel beam strengthening structure, comprising a cantilever steel beam (2), a first channel steel (14), a second channel steel (19), a tightening member (8), a triangular steel plate (4), a rectangular hollow diagonal brace (3), a floor slab (1), and a beam (13), characterized in that: The end of the floor slab (1) is perpendicularly connected to the end of the beam (13); one end of the cantilever steel beam (2) is horizontally close to the floor slab (1), and the cantilever steel beam (2) is fixed by the rectangular hollow brace (3), channel steel one (14), channel steel two (19), tightening piece (8) and triangular steel plate (4); the width of the triangular steel plate (4) is the same as that of the cantilever steel beam (2), and it is hollow in the middle. The upper surface where one of the right-angled sides of the triangular steel plate (4) is located is fully welded to the bottom of the cantilever steel beam (2), and the surface where the other right-angled side is located is tightly connected to the beam (13) through two bolts one (5) reserved in the beam (13). The bolt one (5) penetrates through the entire beam (13). The outer surface where the hypotenuse of the triangular steel plate (4) is located is fully welded to the rectangular hollow brace (3); the width of the rectangular hollow brace (3) is also the same as that of the cantilever steel beam (2), and one end of the rectangular hollow brace (3) is fixed to the cantilever steel beam (2) through two bolts three (7) arranged on the cantilever steel beam (2), and the other end of the rectangular hollow brace (3) is fixed to the beam (13) through four bolts two (6) arranged on both sides of the beam (13), and the bolt two (6) penetrates through the entire beam (13); the channel steel one (14) and the channel steel two (19) are vertically arranged between the webs of adjacent cantilever steel beams (2). The channel steel one (14) is arranged at the position where the end of the cantilever steel beam (2) contacts the floor slab (1), and the channel steel one (14) is connected to the floor slab (1) through bolts six (20), and the channel steel one (14) is close to the floor slab (1); the channel steel two (19) is vertically arranged at the top where the cantilever steel beam (2) contacts the rectangular hollow brace (3); the tightening piece (8) is arranged at the middle position of the triangular steel plate (4), and the tightening piece (8) connects the triangular steel plate (4) and the cantilever steel beam (2); the tightening piece (8) is a U-shaped base that sleeves the triangular steel plate (4) and the cantilever steel beam (2). The rectangular steel plate (15) passes through the ends of the two vertical plates of the tightening piece (8) and is fixed through bolts five (18); several bolts four (16) pass through the holes on the two vertical plates of the tightening piece (8) and abut against the web of the cantilever steel beam (2); each channel steel one (14) is connected to the floor slab (1) through four bolts six (20), and the bolts six (20) are embedded in the floor slab (1). The longitudinal steel bars (9) and stirrups (12) in the beam are perpendicularly arranged inside the beam (13), and the top steel bars (10) and bottom steel bars (11) of the floor slab are perpendicularly arranged inside the floor slab (1).

2. The construction method of the non-embedded cantilever steel beam strengthening structure according to claim 1, characterized in that: It includes the following steps: First, fasten the triangular steel plate (4) and the rectangular hollow diagonal brace (3) with bolts one (5) and bolts two (6) passing through the beam (13). Then, place the cantilever steel beam (2). When placing it, connect the cantilever steel beam (2) and the triangular steel plate (4) with the tightening member (8) through bolt five (18). Then, adjust the cantilever steel beam (2) to the appropriate position by fine-tuning bolt four (16), and then perform welding. Finally, tighten bolt three (7) at the rectangular hollow diagonal brace (3). Then, place channel steel one (14) between the flanges on the side of the cantilever steel beam (2) close to the floor slab (1), and fix channel steel one (14) with bolt six (20) embedded in the floor slab (1). At the same time, weld the contact surface between channel steel one (14) and the flange. However, at the external corner of the building, channel steel one (14) is arranged obliquely, has no bolt connection with the floor slab (1), and is welded to the contact surface of the flange of the cantilever steel beam (2). Repeat these processes until all the cantilever steel beams (2) are installed. Finally, the cantilever steel beams (2) support the external scaffolding (17).

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