CN111236605A - Non-pre-buried cantilever steel beam and reinforcing structure thereof - Google Patents

Abstract

The invention belongs to the technical field of building construction, in particular to a non-pre-embedded cantilevered steel beam and a reinforcing structure thereof, comprising a cantilevered steel beam, a channel steel, a channel steel two, a compression part, a triangular steel plate, a rectangular hollow diagonal brace, Floors, beams, the end of the floor and the end of the beam are vertically connected; one end of the cantilevered steel beam is horizontally close to the floor, using rectangular hollow diagonal braces, channel steel 1, channel steel 2, compression parts and triangular steel plates to the cantilever steel The beam is fixed; the tightening member in the present invention can be fine-tuned through bolts to meet the installation accuracy requirements. When the connection between the channel steel and the floor slab fails, the rectangular truss-type diagonal bracing and the triangular steel plate of the present invention eliminate the danger of falling when the original non-pre-embedded cantilevered steel beam is damaged, which not only ensures the safety of the ground staff, but also ensures the safety of the ground staff. Allowing workers enough time for maintenance, because the channel steel can ensure the force transmission between the cantilevered steel beams, and can also resist the horizontal shear force generated by the scaffolding under strong winds, and also improve the strength and rigidity of the cantilevered steel beams.

Description

A non-pre-embedded cantilevered steel beam and its reinforcing structure

technical field

The invention belongs to the technical field of building construction, and particularly relates to a non-pre-embedded cantilevered steel beam and a reinforcing structure thereof.

Background technique

The cantilevered steel beam is used as the base of the cantilevered scaffold, but in the existing technology, the non-embedded cantilevered steel beam is only connected by two bolts at the top, and the bolts are fixed in the concrete by pre-embedding. The strength of concrete at different positions may be slightly different due to reasons such as water-cement ratio or uneven vibration, which directly leads to different strengths that the bolts at different positions can bear. Only installing the top two bolts may cause overhangs Steel beams were destroyed. In addition, many projects choose 7 floors, and when the cantilevered steel beam fixed by only 2 bolts breaks down and falls from the 7th floor, it will pose a safety threat to the downstairs construction workers.

SUMMARY OF THE INVENTION

In order to solve the above existing technical problems, the present invention provides a non-pre-embedded cantilevered steel beam and its reinforcing structure. The main purpose is to develop a cantilever structure that can be prefabricated in advance, easy to install, accurate to install, easy to disassemble and has better force performance, which can effectively increase the strength of the fixed end of the cantilevered steel beam, and can also increase the overall strength of the cantilevered steel beam. It can also make each cantilevered steel beam participate in the force together, increase the lateral shear resistance of each other, and avoid perforating the wall to place the cantilevered steel beam to reduce damage to the wall. It can effectively solve the hidden safety hazard caused by the failure of the non-buried cantilevered steel beam, and ensure the safety of the ground staff.

The technical scheme adopted in the present invention is as follows:

A non-pre-embedded cantilevered steel beam reinforced structure, comprising a cantilevered steel beam, a channel steel, a channel steel two, a compression piece, a triangular steel plate, a rectangular hollow diagonal brace, a floor slab, and a beam;

The ends of the floor slabs are vertically connected to the ends of the beams;

One end of the cantilevered steel beam is horizontally close to the floor, and the cantilevered steel beam is fixed by rectangular hollow diagonal bracing, channel steel 1, channel steel 2, compression parts and triangular steel plates;

The width of the triangular steel plate is the same as that of the cantilevered steel beam, the center is hollow, and the upper surface of one right-angled side of the triangular steel plate is fully welded with the bottom of the cantilevered steel beam, and the surface of the other right-angled side passes through the two reserved in the beam. One bolt is closely connected with the beam, and the bolt runs through the whole beam, and the outer surface where the hypotenuse of the triangular steel plate is located is fully welded with the rectangular hollow bracing; the width of the rectangular hollow bracing is also the same as the width of the cantilevered steel beam, and the rectangular One end of the hollow diagonal brace and the cantilevered steel beam are fixed by two bolts arranged on the cantilevered steel beam, and the other end of the rectangular hollow diagonal brace and the beam are fixed by four bolts arranged on both sides of the beam, and the bolts two runs through the entire beam;

Channel steel 1 and channel steel 2 are vertically arranged between adjacent I-beam webs, and the channel steel is arranged at the position where the end of the pick-up beam is in contact with the floor slab, and the channel steel is connected with the floor slab through bolt 6, and the channel steel is tightened. affixed to the floor;

The channel steel is arranged vertically at the top of the contact between the I-beam and the rectangular hollow bracing;

The compression part is arranged in the middle of the triangular steel plate, and the compression part connects the triangular steel plate and the cantilevered steel beam; the compression part is a U-shaped base, covering the triangular steel plate and the cantilevered steel beam, and the rectangular steel plate passes through the two vertical plates on the compression part The end of , and fixed by bolt five;

A number of bolts pass through the holes in the two vertical plates of the tightening member, and abut on the web plate of the cantilevered steel beam.

Further, each channel steel is connected with the floor slab by four bolts, and the bolts are pre-buried in the floor slab.

Further, the longitudinal reinforcing bars and stirrups in the beams are arranged vertically inside the beams, and the floor gluten and the floor bottom bars are vertically arranged inside the floor slabs.

The sleeves left when the bolts connecting the triangular steel plate and the beams pass through the formwork pass through the beam, and the bolts connecting the rectangular hollow diagonal brace and the beam pass through the formwork.

Beneficial effects of the present invention:

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

1) Easy to install, easy to disassemble, better stress performance, and can also increase the strength of the cantilevered steel beam.

2) The cantilevered steel beam of the present invention has no connection with the floor slab, and the rest of the components connected to the beam are arranged through the reserved bolt sleeves to arrange the bolts throughout the entire beam, and the bolts can be reused, saving costs.

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

4) The channel steel in the present invention can ensure the force transmission between the cantilevered steel beams, and can also resist the horizontal shear force generated by the scaffolding under strong wind, so the strength and rigidity of the cantilevered steel beams are also improved.

5) The triangular steel plate and the rectangular hollow diagonal brace can effectively increase the strength of the fixed end of the cantilevered steel beam, and can also reduce the torsional instability of the cantilevered steel beam due to the problem of the force position. The strength and stiffness of the non-buried cantilevered steel beams can also effectively solve the hidden safety hazards of falling due to insufficient bearing capacity.

6) When the cantilevered steel beam is installed, the cantilevered steel beam fastened by the tightening member in the present invention can be fine-tuned horizontally through bolts to meet the installation accuracy requirements.

7) The channel steel in the present invention can ensure the force transmission between the cantilevered steel beams, improve the overall bearing capacity, and can also resist the horizontal shear force generated by the scaffolding under strong wind, so the rigidity of the cantilevered steel beams is also improved.

8) In the present invention, the non-pre-embedded cantilevered steel beam has no connection with the floor slab and does not need to pass through the wall, which avoids piercing the wall, reduces the use of bolts, and maintains the integrity of the wall.

Description of drawings

Fig. 1 is the top view of the overall structure on the n floor slab;

Figure 2 is the anchoring diagram of the overall structure in the floor;

Figure 3 is a right side view of any cantilever structure;

Figure 4 is the reinforcement diagram of the floor slab and beam;

Fig. 5 is A-A sectional view;

Figure 6 is a perspective view of a cantilevered steel beam and its reinforcing structure;

In the figure, 1 is the floor slab, 2 is the cantilevered steel beam, 3 is the rectangular hollow bracing, 4 is the triangular steel plate, 5 is the bolt one, 6 is the second bolt, 7 is the bolt three, 8 is the compression part, and 9 is the inner beam Longitudinal reinforcement, 10 is floor gluten, 11 is floor bottom reinforcement, 12 is stirrup, 13 is beam, 14 is channel steel, 15 is rectangular steel plate, 16 is bolt four, 17 is outer scaffolding, 18 is bolt five, and 19 is Channel steel, 20 for bolt six.

Detailed ways

The present invention is described in detail below in conjunction with accompanying drawing and embodiment:

Example: As shown in Figures 1 to 6, a non-pre-embedded cantilevered steel beam reinforced structure includes a cantilevered steel beam 2, a channel steel 14, a channel steel two 19, a compression member 8, a triangular steel plate 4, Rectangular hollow bracing 3, floor 1, beam 13,

The end of the floor slab 1 is vertically connected with the end of the beam 13;

One end of the cantilevered steel beam 2 is horizontally close to the floor 1, and the cantilevered steel beam 2 is fixed by a rectangular hollow diagonal brace 3, a channel steel 14, a channel steel 2 19, a compression piece 8 and a triangular steel plate 4;

The width of the triangular steel plate 4 is the same as that of the cantilevered steel beam 2, the middle is hollow, and the upper surface where one right-angled side of the triangular steel plate 4 is located is fully welded with the bottom of the cantilevered steel beam 2, and the surface where the other right-angled side is located passes through the beam 13 The two reserved bolts 1 5 are closely connected with the beam 13, the bolt 1 5 runs through the entire beam 13, and the outer surface where the hypotenuse of the triangular steel plate 4 is located is fully welded with the rectangular hollow diagonal brace 3; the width of the rectangular hollow diagonal brace 3 is fully welded. It is also consistent with the width of the cantilevered steel beam 2, and one end of the rectangular hollow diagonal brace 3 and the cantilevered steel beam 2 are fixed by two bolts 3 7 arranged on the cantilevered steel beam 2, and the other end of the rectangular hollow diagonal brace 3 is fixed. The beam 13 is fixed by four bolts 2 6 arranged on both sides of the beam 13, and the bolts 2 6 run through the entire beam 13;

Channel steel one 14 and channel steel two 19 are vertically arranged between the adjacent I-beam 2 webs, and the channel steel 14 is arranged at the position where the end of the pick-up beam 2 is in contact with the floor 1, and the channel steel 14 passes through the bolt six. 20 is connected with the floor 1, and the channel steel 14 is close to the floor 1;

The channel steel 19 is vertically arranged on the top of the I-beam 2 in contact with the rectangular hollow diagonal brace 3;

The compression member 8 is arranged in the middle of the triangular steel plate 4, and the compression member 8 connects the triangular steel plate 4 and the cantilevered steel beam 2; The ends of the two vertical plates on the tightening member 8 are fixed by bolts 5 18;

Several bolts 4 16 pass through the holes in the two vertical plates of the tightening member 8 and push against the web plate of the cantilevered steel beam 2 .

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 in advance.

The longitudinal reinforcement bars 9 and stirrups 12 in the beam are arranged vertically inside the beam 13 , and the floor gluten 10 and the floor bottom reinforcement 11 are arranged vertically inside the floor slab 1 .

A construction method for a non-embedded cantilevered steel beam reinforced structure, comprising the following steps:

First, the triangular steel plate 4 and the rectangular hollow diagonal brace 3 are fastened by bolts 1 5 and 2 6 through the beam 13, and then the cantilevered steel beam 2 is placed. Connect with the triangular steel plate 4, adjust the cantilever steel beam 2 to the appropriate position through fine-tuning bolts 4 16, then weld, and finally tighten the bolts 3 7 at the 3 places of the rectangular hollow diagonal brace, and then place the channel steel 14 on the The cantilevered steel beam 2 is between the flanges on the side of the floor 1, and the channel steel 14 is fixed by the bolts 20 embedded in the floor 1. At the same time, the channel steel 14 and the flange contact surface are welded, but at the outside corner of the building. , the channel steel 14 is arranged obliquely, is connected with the floor 1 without bolts, and is welded with the contact surface of the flange of the cantilevered steel beam 2. Repeat these processes until all the cantilevered steel beams 2 are installed, and finally the cantilevered steel beams 2 are supported. Outer scaffolding 17.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the principles of the present invention, several improvements and modifications can be made. It should be regarded as the protection scope of the present invention.

Claims (4)

1. The utility model provides a non-pre-buried formula girder steel additional strengthening of encorbelmenting, includes girder steel (2) of encorbelmenting, channel-section steel one (14), channel-section steel two (19), reduces a (8), triangle-shaped steel sheet (4), rectangle hollow diagonal bracing (3), floor (1), roof beam (13), its characterized in that:

the end part of the floor (1) is vertically connected with the end part of the beam (13);

one end of the cantilever steel beam (2) is horizontally attached to the floor slab (1), and the cantilever steel beam (2) is fixed by adopting a rectangular hollow inclined strut (3), a first channel steel (14), a second channel steel (19), a tightening piece (8) and a triangular steel plate (4);

the width of the triangular steel plate (4) is consistent with that of the cantilever steel beam (2), the middle of the triangular steel plate is hollow, the upper surface of one right-angle side of the triangular steel plate (4) is in full welding with the bottom of the cantilever steel beam (2), the surface of the other right-angle side of the triangular steel plate is tightly connected with the beam (13) through two bolts (5) reserved in the beam (13), the bolts (5) penetrate through the whole beam (13), and the outer surface of the bevel edge of the triangular steel plate (4) is in full welding with the rectangular hollow diagonal brace (3); the width of the rectangular hollow diagonal brace (3) is also consistent with that of the cantilever steel beam (2), one end of the rectangular hollow diagonal brace (3) is fixed with the cantilever steel beam (2) through two third bolts (7) arranged on the cantilever steel beam (2), the other end of the rectangular hollow diagonal brace (3) is fixed with the beam (13) through four second bolts (6) arranged on two sides of the beam (13), and the second bolts (6) penetrate through the whole beam (13);

the first channel steel (14) and the second channel steel (19) are vertically arranged between webs of adjacent I-shaped steel (2), the channel steel (14) is arranged at the position where the end part of the cantilever steel beam (2) is in contact with the floor slab (1), the channel steel (14) is connected with the floor slab (1) through a six-bolt (20), and the channel steel (14) is tightly attached to the floor slab (1);

the channel steel (19) is vertically arranged at the top of the I-shaped steel (2) contacted with the rectangular hollow inclined strut (3);

the tightening piece (8) is arranged in the middle of the triangular steel plate (4), and the tightening piece (8) is connected with the triangular steel plate (4) and the cantilever steel beam (2); the tightening part (8) is a U-shaped base, a triangular steel plate (4) and an overhanging steel beam (2) are sleeved, and a rectangular steel plate (15) penetrates through the end parts of two vertical plates on the tightening part (8) and is fixed through a fifth bolt (18);

a plurality of bolts four (16) penetrate through holes in two vertical plates of the tightening part (8) and are propped against a web plate of the cantilever steel beam (2).

2. The non-embedded cantilever steel beam reinforcing structure of claim 1, wherein: each channel steel (14) is connected with the floor (1) through four bolts (8), and the bolts (8) are embedded into the floor (1).

3. The non-embedded cantilever steel beam reinforcing structure of claim 1, wherein: longitudinal steel bars (9) and stirrups (12) in the beam are perpendicular to each other and arranged inside the beam (13), and floor slab gluten (10) and floor slab bottom bars (11) are perpendicular to each other and arranged inside the floor slab (1).

4. The construction method of the non-embedded cantilever steel beam reinforcing structure according to claim 1, wherein: the method comprises the following steps:

firstly fastening a triangular steel plate (4) and a rectangular hollow inclined strut (3) through a first bolt (5) and a second bolt (6) penetrating through a beam (13), then placing a cantilever steel beam (2), connecting the cantilever steel beam (2) and the triangular steel plate (4) through a fifth bolt (18) by a tightening part (8) during placement, adjusting the cantilever steel beam (2) to a proper position through a fourth fine-adjustment bolt (16), then welding, finally screwing a third bolt (7) at the rectangular hollow inclined strut (3), then placing a channel steel (14) between flanges at one side of the cantilever steel beam (2) close to a floor slab (1), fixing the channel steel (14) through a sixth bolt (20) pre-embedded in the floor slab (1), and simultaneously welding the channel steel (14) and a flange contact surface, wherein at a building external corner, the channel steel (14) is obliquely arranged and is not connected with the floor slab (1), and (3) welding the contact surface of the flange of the cantilever steel beam (2), repeating the procedures until all the cantilever steel beams (2) are installed, and finally, bearing the outer scaffold (17) by the cantilever steel beams (2).

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