Combined scaffold cantilever beam

Abstract

The utility model provides a combined scaffold cantilever beam, including a plurality of groups of cantilever beam units of head to tail, is provided with the bending resistance bolt support in the wing plate side of every group cantilever beam unit link end, and the bending resistance bolt support of adjacent two pieces is connected as a whole through the bending resistance connecting piece, is provided with the shear connector in the web side of every group cantilever beam unit link end, the shear connector extends to the bending resistance bolt support and is connected as a whole with the bending resistance bolt support outward. The cantilever beam adopts the form of sectional combination, uses after assembling, sectional dismantling and transportation, and reliable connecting device is equipped between the adjacent two sections for transmitting bending moment and shear, and the construction is convenient, can effectively avoid the security risk of worker high altitude operation.

Description

Technical Field

[0001] This utility model relates to the field of safe construction technology for cantilever scaffolding in building engineering, and in particular to a combined scaffolding cantilever beam. Background Technology

[0002] With socio-economic development, the requirements for construction safety are becoming increasingly stringent. In high-rise building construction, cantilever scaffolding is a widely used safety maintenance facility. In cantilever scaffolding, the lower cantilever beam is the main load-bearing component. Cantilever beams are typically single I-beams, long and heavy, requiring tower cranes for transport and dismantling, as manual lifting is extremely difficult. At building corners or gable walls, cantilever beams need to penetrate walls. When the cantilever beam is far from nearby building openings, workers must work at height to attach tower crane ropes, posing a significant safety hazard. Furthermore, the considerable length of the cantilever beam can lead to situations where the scaffolding at the highest point of the building is dismantled later than the tower crane has been removed. When the length of the cantilever beam exceeds the length of the construction elevator car, its transportation becomes a major challenge.

[0003] The utility model patent with patent number CN 218264851 U discloses a combined quick-assembly cantilever beam. By setting flange plates at the ends of two adjacent I-beams and connecting the two flange plates with screws, multiple sections of cantilever beams are combined into a whole. Although this connection method is equipped with reinforcing ribs, the cantilever beam is the main load-bearing structure used to support scaffolding. The flange connection close to the end is far from achieving the required support strength and cannot meet the bending and shear strength requirements of the cantilever beam.

[0004] The utility model patent with patent number CN203961249U discloses a combined cantilever beam. The cantilever beam is connected as a whole by ground anchor rings and pins on the web, but it still cannot solve the bending resistance defect of the cantilever beam. Utility Model Content

[0005] To address the problems existing in the prior art, this utility model provides a modular scaffolding cantilever beam. The cantilever beam is assembled in sections, and can be used, disassembled, and transported in sections. Reliable connecting devices are provided between adjacent sections to transfer bending moment and shear force, making construction convenient and effectively avoiding safety hazards for workers working at heights.

[0006] A modular scaffolding cantilever beam includes multiple sets of cantilever beam units connected end to end. Each set of cantilever beam units has a bending bolt support on the side of the flange at the connection end. Adjacent bending bolt supports are connected as a whole by bending connectors. Each set of cantilever beam units has a shear connector on the side of the web at the connection end. The shear connector extends outward to the bending bolt support and is connected to the bending bolt support as a whole.

[0007] Preferably, the web of the cantilever beam unit is provided with a shear plate, and the shear connector is connected to the web of the cantilever beam unit through the shear plate. Adjacent cantilever beam units are connected to each other through the same shear plate.

[0008] Preferably, a shear plate is symmetrically arranged on each side of the web of the cantilever beam unit, and a shear connector is provided on the outer side of each shear plate.

[0009] Preferably, the anti-bending bolt support is a box-type structure, and the anti-shear connector extends outward and protrudes from the outside of the box-type structure, with a fastening nut provided on the protruding part of the anti-shear connector.

[0010] Preferably, a connecting frame is provided on the inner side of the flange at the joint end of each cantilever beam unit, and adjacent connecting frames are connected as a whole by bolts.

[0011] Preferably, the connecting frame is a horizontal U-shaped structure, and bolts connect the middle plate of the U-shaped structure of the two connecting frames into a whole.

[0012] Preferably, the cantilever beam unit located on the outside of the wall has a cantilever beam limiting rod provided on the lower side of its wing plate.

[0013] Preferably, the cantilever beam unit located on the outside of the wall has multiple sets of limiting supports on the side of its web, and the cantilever beam limiting rod is detachably connected to the limiting support.

[0014] Preferably, the limiting support is provided with a through hole that is open at both the top and bottom, and the cantilever beam limiting rod passes through the wing plate and the through hole from bottom to top and is then positioned and engaged with the limiting support by a locking block.

[0015] Preferably, the cantilever beam unit located on the outside of the wall has an upright for installing scaffolding on the upper side of its wing plate, and the upright is connected to the limiting support through an upright limiting rod.

[0016] The beneficial effects of this utility model are as follows: The device features anti-bending bolt supports on the outer side of the flange to transfer the tensile force generated by the negative bending moment of the cantilever beam. Shear plates and shear connectors are connected to the web of the cantilever beam, forming a unified structure at the joint and reliably transferring shear force. Cantilever beam limiting rods and upright limiting rods restrict the horizontal position of the cantilever beam. These three structural elements effectively ensure the overall strength and load-bearing capacity of the spliced ​​composite cantilever beam. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure in use of this utility model. Figure 1 ; Figure 2 This is a schematic diagram of the structure in use of this utility model. Figure 2 ; Figure 3 for Figure 2 Enlarged view of A in the middle; Figure 4 This is a schematic diagram of the overall structure of the cantilever beam of the modular scaffolding; Figure 5 for Figure 4 Enlarged view of B in the middle; Figure 6 This is a schematic diagram of the front section of the cantilever beam. Figure 7 This is a schematic diagram of a bending bolt support structure; Figure 8 This is a schematic diagram of the shear connector structure; Figure 9 This is a schematic diagram of the limiting support structure; Among them, 1. wall, 2. floor slab, 3. cantilever beam of combined scaffolding, 4. upright, 5. cantilever beam limiting rod, 6. limiting support, 7. clamping block, 8. upright limiting rod, 9. shear plate, 10. bending bolt support, 11. extended section of cantilever beam, 12. front section of cantilever beam, 13. bending connector, 14. pressure block, 15. shear connector, 16. pin shaft, 17. connecting frame. Detailed Implementation

[0019] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0021] like Figure 1-9 As shown, this utility model discloses a modular scaffolding cantilever beam, which modifies the existing integrated cantilever beam into a multi-segment cantilever beam unit. The cantilever beam units at adjacent ends are combined into a whole by interlocking limiting supports 6 and connecting frames 17, and shear plates 9 that overlap with the cantilever beam units. At the same time, the bending and shear resistance of the modular cantilever beam is improved by the above components.

[0022] The entire modular scaffolding cantilever beam 3 consists of two main parts: the front section 12 of the cantilever beam located on the outside of wall 1, and the extended section 12 of the cantilever beam located on the inside of wall 1. Both the front section and the extended section of the cantilever beam are I-beam structures, and in the installation state, the lower flange of the I-beam is in contact with the floor slab 2 and fixed by connectors.

[0023] 1. Front Section 12 of the Cantilever Beam: Most of the front section 12 of the cantilever beam extends outside the building and is used to directly support the scaffold uprights 4. Multiple sets of paired first through holes are opened on the surface of the upper flange of the front section 12 of the cantilever beam for installing upright limiting rods 8. The distance between two adjacent sets of first through holes is the lateral distance between the two uprights 4 of the external scaffold. A bending bolt support 10 is welded to the rear of the upper surface of the flange of the front section 12 of the cantilever beam. The bending bolt support 10 is a box-type structure formed by welding longitudinal and transverse partitions. This box-type structure does not have an upper top plate and a lower bottom plate. Connection holes are opened on the side of the box-type structure along the extension direction of the cantilever beam. A bending connector connects the box-type structure to the box-type bending bolt support on the surface of the extended section 11 of the cantilever beam through these connection holes, serving to transfer the tensile force generated by the negative bending moment borne by the cantilever beam. The bending connector preferably uses a bending bolt and is equipped with a fastening nut that mates with the bolt.

[0024] A shear plate 9 is welded to the lower rear end of the web of the cantilever beam 12. The shear plate 9 consists of two steel plates symmetrically welded to both sides of the web. The height of the shear plate 9 is half the height of the web, and the connection length between the shear plate 9 and the web is half the total length of the shear plate. The total cross-sectional thickness of the two shear plates should be greater than the thickness of the web. A second through hole is opened on both the shear plate and the web for connecting the shear plate 9 to the web as a whole through relevant connectors. The connector can be a threaded rod or a pin.

[0025] Multiple pairs of limiting supports 6 are welded to both sides of the web of the front section 12 of the cantilever beam. The two pairs of limiting supports 6 at the front end are used to install the vertical pole limiting rods 8, and several pairs of limiting supports 6 are welded to the rear end to install the cantilever beam limiting rods 5. The cantilever beam limiting rods 5 abut against the wall 1 to limit the horizontal displacement of the cantilever beam. The spacing between each pair of limiting supports 6 is 50mm to accommodate different cantilever lengths.

[0026] The limiting support 6 is welded from a sleeve and a C-shaped steel plate, and is welded to the corresponding position on the web of the cantilever beam according to different requirements. The cantilever beam limiting rod 5 and the upright limiting rod 8 are both made of round steel, with a through groove opened at one end of the round steel. The through groove can be inserted into the locking block 7, which is U-shaped and is locked onto the sleeve of the limiting support 6 to restrict the vertical position of the limiting rod and prevent it from falling off.

[0027] It should be noted that the width of the through slot of the round steel is greater than or equal to the height of the "U" shape of the locking block 7, to ensure that the locking block 7 can pass through the through slot.

[0028] II. Extended Cantilever Beam Section: A set of anti-bending bolt supports 10 is welded to the front and rear of the flange surface of the extended cantilever beam section 11. These supports are connected to the anti-bending bolt supports 10 on the front section 12 of the cantilever beam via anti-bending connectors 13, forming a whole. This is used to transfer the tensile force generated by the negative bending moment borne by the cantilever beam. Shear plates 9 are welded to the front and rear of the web of the extended cantilever beam section. Since the height of the shear plates is only half the height of the web, the shear plates welded on the extended cantilever beam section and the shear plates welded on the front section 12 of the cantilever beam are staggered, one above the other, to achieve splicing between the front section of the cantilever beam and the extended cantilever beam section, as well as between multiple extended cantilever beam sections.

[0029] III. Other: Shear connector 15 is provided on the outside of shear plate 9. Shear connector consists of perforated steel plate and shear screw. The perforated steel plate is connected to the shear plate as a whole by pin 16. Shear screw passes through the upper flange of cantilever beam and then through and protrudes from the perforated pressure block 14. The protruding part of shear screw is fixed with fastening nut so that the splice of the two cantilever beam units forms a whole and reliably transmits shear force.

[0030] A set of connecting frames 17 is symmetrically installed on the upper surface of the bottom flange connection end of the cantilever beam and on both sides of the web. The connecting frame is a horizontal U-shaped structure. The middle plate of the U-shaped structure is machined with a third through hole. Using the third through hole, the connecting frames between adjacent cantilever beam units are connected by bolts and nuts to further form a shear-resistant connection structure.

[0031] When using this device, first place the front section 12 of the cantilever beam at the corresponding position on the building. Then, splice several extended sections 11 of the cantilever beam according to the designed length of the cantilever beam. Install the bending connector 13, shear bolts, and bolts at the bottom of each section to the corresponding positions. Install the cantilever beam limiting rod 5 and the upright limiting rod 8 on the outside of the cantilever end. Finally, fix the entire cantilever beam to the building. Note that when designing the fixing point with the building, the splicing point of each cantilever beam section must have a negative bending moment.

[0032] During dismantling, first remove the cantilever beam limit rod 5 and the upright limit rod 8, then remove the entire cantilever beam back into the building, and then disassemble and transport each section separately.

[0033] Using this device can prevent workers from working at heights during the dismantling of cantilever beams after the scaffolding has been dismantled, reducing the probability of accidents such as falls from heights. The cantilever beams can be transported in sections, reducing labor intensity. Disassembling and recycling the cantilever beams in sections within the building reduces reliance on tower cranes, allowing for earlier dismantling and lowering rental costs. Standardized, segmented manufacturing facilitates reuse and reduces overall project costs.

[0034] Although the present invention has been described in detail with reference to the accompanying drawings and preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made to the embodiments of the present invention by those skilled in the art without departing from the spirit and essence of the present invention, and such modifications or substitutions should all be within the scope of the present invention. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should also be included within the protection scope of the present invention.

Claims

1. A modular scaffolding cantilever beam, characterized in that, It includes multiple sets of cantilever beam units connected end to end. Each set of cantilever beam units has a bending bolt support (10) on the side of the flange at the connection end of the cantilever beam unit. Two adjacent bending bolt supports (10) are connected as a whole by a bending connector (13). Each set of cantilever beam units has a shear connector (15) on the side of the web at the connection end of the cantilever beam unit. The shear connector (15) extends outward to the bending bolt support (10) and is connected to the bending bolt support as a whole.

2. The combined scaffolding cantilever beam according to claim 1, characterized in that, The web of the cantilever beam unit is provided with a shear plate (9), and the shear connector (15) is connected to the web of the cantilever beam unit through the shear plate (9). Two adjacent sets of cantilever beam units are connected to each other through the same shear plate (9).

3. A combined scaffolding cantilever beam according to claim 2, characterized in that, The cantilever beam unit has a shear plate (9) symmetrically arranged on both sides of the web, and each shear plate (9) has a shear connector (15) on its outer side.

4. A combined scaffolding cantilever beam according to claim 1, characterized in that, The bending bolt support (10) is a box-type structure. The shear connector (15) extends outward and protrudes from the outside of the box-type structure. A fastening nut is provided on the protruding part of the shear connector (15).

5. A combined scaffolding cantilever beam according to claim 1, characterized in that, Each cantilever beam unit has a connecting frame (17) on the inner side of the flange at the joint end. Two adjacent connecting frames (17) are connected as a whole by bolts.

6. A combined scaffolding cantilever beam according to claim 5, characterized in that, The connecting frame (17) is a horizontal U-shaped structure, and bolts connect the middle plate of the U-shaped structure in the two connecting frames into a whole.

7. A combined scaffolding cantilever beam according to claim 1, characterized in that, The cantilever beam unit located on the outside of the wall has a cantilever beam limiting rod (5) installed on the lower side of its wing plate.

8. A combined scaffolding cantilever beam according to claim 7, characterized in that, The cantilever beam unit located on the outside of the wall has multiple sets of limiting supports (6) on the side of its web plate. The cantilever beam limiting rod (5) is detachably connected to the limiting support (6).

9. A combined scaffolding cantilever beam according to claim 8, characterized in that, The limiting support (6) is provided with a through hole that is open at the top and bottom. The cantilever beam limiting rod (5) passes through the wing plate and the through hole from bottom to top and is positioned and engaged with the limiting support (6) by a locking block (7).

10. A combined scaffolding cantilever beam according to claim 8, characterized in that, The cantilever beam unit located on the outside of the wall has an upright (4) for installing scaffolding on the upper side of its wing plate. The upright (4) is connected to the limiting support (6) through the upright limiting rod (8).

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