The existing cantilever beam balcony is reinforced by square steel pipe support

Abstract

This utility model relates to the reinforcement of existing cantilever beam balconies using square steel tube supports, including square steel tube supports, lower steel pads, upper steel pads, and steel wedges. The upper and lower steel pads are welded to both ends of the square steel tube supports. These upper and lower steel pads are tightly fitted against the upper cantilever beam and the lower balcony slab, respectively. The upper steel pad is fixed to the cantilever beam on the bottom surface of the balcony slab via expansion bolts through mounting holes. The lower steel pad is fixed to the balcony slab via expansion bolts through mounting holes, and is further secured with steel wedges. This utility model transforms the original balcony's load-bearing system into a cantilever beam end-loaded system. By installing square steel tube supports layer by layer from bottom to top, it reduces the internal forces of the cantilever beam and improves the structural bearing capacity.

Description

Technical Field

[0001] This utility model relates to a method for reinforcing existing cantilever beam balconies with square steel pipe supports, belonging to the technical field of resilient building research. Background Technology

[0002] With the gradual improvement of urban living standards and economic conditions, people's demands for quality of life are also increasing. Many existing residential buildings in my country were constructed in the 1980s and 1990s. Due to their early planning and construction, and relatively low construction standards, they suffer from various problems such as aging equipment, peeling building facades, and poor energy-saving insulation, requiring reinforcement and renovation. Balconies are an important component of buildings and a vital space for daily life, making their safety particularly important. Due to long-term load-bearing and aging, balcony slabs often exhibit varying degrees of tilting and cracks, seriously affecting the safety of residents. Currently, the main problems with balconies are that the design load is lower than the actual usage value, the calculation method does not fully match the actual structural stress, and the reinforcing steel bars generally shift downwards. Therefore, the structural safety and reliability of balconies are generally low, necessitating reinforcement. Thus, reinforcing balcony structures in existing residential buildings has become a crucial issue that urgently needs to be addressed in seismic reinforcement. Utility Model Content

[0003] This utility model proposes to reinforce existing cantilever beam balconies with square steel pipe supports, changing their stress state from cantilever beam slab to non-cantilever beam slab. The main purpose is to improve the overall seismic resistance of the original balcony structure, thereby enhancing the toughness of the building and preventing the balcony from falling off.

[0004] The technical solution of this utility model is as follows:

[0005] The existing cantilever beam balcony is reinforced with square steel pipe supports, characterized by: square steel pipe supports, lower steel pads, upper steel pads, expansion bolts, and steel wedges; the square steel pipe supports are made of cold-formed thin-walled square steel pipes; upper and lower steel pads are welded to both ends of the square steel pipe supports; the upper and lower steel pads are respectively welded to the pad welding area; the upper steel pad has four pad mounting holes; the lower steel pad has two pad mounting holes; the upper and lower steel pads welded to both ends of the square steel pipe supports tightly press against the upper cantilever beam and the lower balcony slab respectively; the upper steel pad is fixed to the cantilever beam on the bottom surface of the balcony slab through the pad mounting holes and through the expansion bolts; the lower steel pad is fixed to the balcony slab through the pad mounting holes and through the expansion bolts, with latex cement grout between them, and steel wedges are used for wedging.

[0006] Furthermore, the cross-sectional dimensions of the square steel pipe support are cold-formed thin-walled square steel pipes with dimensions ranging from □50×3 to 80×4.

[0007] Furthermore, both the upper and lower steel pads are cold-rolled steel plates with dimensions of 140mm × 120mm and a thickness of not less than 10mm.

[0008] Furthermore, the upper steel pad has 4φ12 pad mounting holes.

[0009] Furthermore, the lower steel pad has 2φ14 pad mounting holes.

[0010] Furthermore, the upper steel pad is fixed to the cantilever beam on the bottom surface of the balcony slab using φ10 expansion bolts.

[0011] Furthermore, the lower steel pad is fixed to the balcony panel using φ12 expansion bolts.

[0012] Furthermore, the steel plate wedge has a width of 50mm and a thickness of 2mm to 10mm.

[0013] The above-mentioned reinforcement of existing cantilever beam balconies using square steel pipe supports and its construction method are as follows:

[0014] Step 1: According to the design drawings, pre-drill expansion bolt holes on the cantilever beam at the bottom of the balcony slab, with the hole diameter matching the diameter of the expansion bolts to be installed;

[0015] Step 2: According to the design drawings, drill holes for expansion bolts on the balcony slab, ensuring the hole diameter matches the diameter of the pre-installed expansion bolts;

[0016] Step 3: Position the mounting holes of the upper and lower steel pads welded at both ends of the square steel pipe support to the positions of the previously drilled expansion bolt holes. Insert the expansion bolts into the mounting holes of the pads and tighten them. Before installing the lower steel pad, pre-fill it with latex cement grout.

[0017] Step 4: Wed the lower steel pad and the balcony slab tightly with steel wedges.

[0018] Beneficial effects:

[0019] The most significant advantage of this invention lies in its use of square steel pipe supports to reinforce existing cantilever beam balconies, altering the original structural stress system and transforming it into stress on the cantilever beam ends. Square steel pipe supports are installed layer by layer from bottom to top, reducing internal forces in the cantilever beam and increasing the structural bearing capacity. This method is simple and reliable, improving the overall seismic resistance of the balcony structure, thereby enhancing the overall resilience of the building and preventing balcony collapse or detachment. The use of square steel pipe supports to reinforce cantilever beam balconies is easy to construct, provides a reasonable structural stress distribution, and offers good economic and environmental benefits. Attached Figure Description

[0020] Figure 1A schematic diagram of a plan view showing the reinforcement of an existing cantilever beam balcony using square steel pipe supports.

[0021] Figure 2 for Figure 1 AA cross-section view;

[0022] Figure 3 for Figure 2 Enlarged view of point B;

[0023] Figure 4 This is a structural diagram of the upper steel pad.

[0024] Figure 5 This is a structural diagram of the lower steel pad.

[0025] In the diagram, 1: square steel pipe support; 2: cantilever beam; 3: balcony slab; 4: upper steel pad; 5: lower steel pad; 6: expansion bolt; 7: steel plate wedge; 8: pad mounting hole; 9: pad welding area; 10: brick wall; 11: balcony door. Detailed Implementation

[0026] Existing cantilever beam balconies are reinforced with square steel pipe supports, see [link / reference]. Figures 1-5 As shown, the feature is that it includes a square steel pipe support 1, a lower steel pad 5, an upper steel pad 4, expansion bolts 6, and steel wedges 7; the square steel pipe support 1 is made of cold-formed thin-walled square steel pipe; the upper steel pad 4 and the lower steel pad 5 are welded to both ends of the square steel pipe support 1; the upper steel pad 4 and the lower steel pad 5 are respectively welded to the pad welding area 9; the upper steel pad 4 has four pad mounting holes 8; the lower steel pad 5 has two pad mounting holes 8; the upper steel pad 4 and the lower steel pad 5 welded to both ends of the square steel pipe support 1 are respectively tightly pressed against the upper cantilever beam 2 and the lower balcony slab 3; the upper steel pad 4 is fixed to the cantilever beam 2 on the bottom surface of the balcony slab 3 through the pad mounting holes 8 and the expansion bolts 6; the lower steel pad 5 is fixed to the balcony slab 3 through the pad mounting holes 8 and the expansion bolts 6, with latex cement grout between them, and steel wedges 7 are used for wedging.

[0027] Furthermore, the square steel pipe support 1 has a cross-sectional dimension of □50×3~80×4 and is a cold-formed thin-walled square steel pipe.

[0028] Furthermore, both the upper steel pad 4 and the lower steel pad 5 are cold-rolled steel plates with external dimensions of 140mm×120mm and a thickness of not less than 10mm.

[0029] Furthermore, the upper steel pad 4 has 4φ12 pad mounting holes 8.

[0030] Furthermore, the lower steel pad 5 has 2φ14 pad mounting holes 8.

[0031] Furthermore, the upper steel pad 4 is fixed to the cantilever beam 2 on the bottom surface of the balcony slab 3 using φ10 expansion bolts 6.

[0032] Furthermore, the lower steel pad 5 is fixed to the balcony panel 3 using φ12 expansion bolts 6.

[0033] Furthermore, the steel plate wedge 7 has a width of 50mm and a thickness of 2mm to 10mm.

[0034] The above-mentioned reinforcement of existing cantilever beam balconies using square steel pipe supports and its construction method are as follows:

[0035] Step 1: According to the design drawings, pre-drill holes for expansion bolts 6 on the cantilever beam 2 on the bottom surface of the balcony slab 3, with the hole diameter matching the diameter of the pre-installed expansion bolts 6;

[0036] Step 2: According to the design drawings, drill holes for expansion bolts 6 on the balcony slab 3, with the hole diameter matching the diameter of the pre-installed expansion bolts 6;

[0037] Step 3: Position the mounting holes 8 of the upper steel pad 4 and lower steel pad 5, which are welded to both ends of the square steel pipe support 1, corresponding to the positions of the previously drilled expansion bolts 6. Insert the expansion bolts 6 into the mounting holes 8 and tighten them. Before installing the lower steel pad 5, it is necessary to pre-fill it with latex cement grout.

[0038] Step 4: Wed the lower steel pad 5 and the balcony slab 3 tightly with steel wedges 7.

[0039] The above is a typical embodiment of the present invention, and the specific implementation of the present invention is not limited thereto.

Claims

1. Existing cantilever beam balconies are reinforced with square steel pipe supports, characterized in that: The support includes a square steel pipe support column (1), a lower steel pad plate (5), an upper steel pad plate (4), expansion bolts (6), and steel plate wedges (7); the square steel pipe support column (1) is made of cold-formed thin-walled square steel pipe; the upper steel pad plate (4) and the lower steel pad plate (5) are welded to both ends of the square steel pipe support column (1); the upper steel pad plate (4) and the lower steel pad plate (5) are respectively welded to the pad plate welding area (9); the upper steel pad plate (4) has four pad plate mounting holes (8); the lower steel pad plate (5) has two pad plate mounting holes. Mounting holes (8); the upper steel pad (4) and lower steel pad (5) welded to both ends of the square steel pipe support (1) are respectively tightly pressed against the upper cantilever beam (2) and the lower balcony slab (3); the upper steel pad (4) is fixed to the cantilever beam (2) on the bottom surface of the balcony slab (3) by passing through the pad mounting hole (8) and the expansion bolt (6); the lower steel pad (5) is fixed to the balcony slab (3) by passing through the pad mounting hole (8) and the expansion bolt (6), with latex cement grout in between, and steel plate wedges (7) are used to wedge it tightly.

2. The existing cantilever beam balcony reinforced with square steel pipe supports as described in claim 1, characterized in that: The square steel pipe support (1) has a cross-sectional dimension of □50×3~80×4 and is a cold-formed thin-walled square steel pipe.

3. The existing cantilever beam balcony reinforced with square steel pipe supports as described in claim 1, characterized in that: The upper steel pad (4) and the lower steel pad (5) are both 140mm×120mm in size and are cold-rolled steel plates with a thickness of not less than 10mm.

4. The existing cantilever beam balcony reinforced with square steel pipe supports as described in claim 1, characterized in that: The upper steel pad (4) has 4φ12 pad mounting holes (8).

5. The existing cantilever beam balcony reinforced with square steel pipe supports according to claim 1, characterized in that: The lower steel pad (5) has 2φ14 pad mounting holes (8).

6. The existing cantilever beam balcony reinforced with square steel pipe supports according to claim 1, characterized in that: The upper steel pad (4) is fixed to the cantilever beam (2) on the bottom surface of the balcony slab (3) using φ10 expansion bolts (6).

7. The existing cantilever beam balcony reinforced with square steel pipe supports according to claim 1, characterized in that: The lower steel pad (5) is fixed to the balcony panel (3) with φ12 expansion bolts (6).

8. The existing cantilever beam balcony reinforced with square steel pipe supports according to claim 1, characterized in that: The steel plate wedge (7) has a width of 50mm and a thickness of 2mm to 10mm.

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