High-safety cantilever beam scaffold for fabricated building

Abstract

The utility model relates to a high-safety cantilever beam scaffold for an assembly type building. According to the scaffold, 16 # I-shaped steel is adopted as a cantilever main beam and fixed to a concrete frame beam through M20 high-strength bolts, and diagonal draw bars are arranged to reinforce the structural stability. The diagonal draw bar is of a turn buckle adjusting structure, the length can be adjusted according to stress requirements, and safety and bearing capacity are improved. The scaffold is provided with an anti-sliding limiting device, displacement of the vertical rods is prevented, double nuts are adopted for fixing, and connection loosening is prevented. The connecting position of the cantilever main beam and the scaffold vertical rod is reinforced, and the overall safety and durability are improved. And load testing needs to be carried out after erection to ensure that the construction safety standard is met. The device is convenient to install, can be repeatedly used, reduces the construction cost, and meets the green construction requirement. The method is suitable for construction of fabricated buildings and high-rise buildings, especially suitable for construction scenes with the cantilever length smaller than or equal to 1.8 m, and the construction safety and efficiency are improved.

Description

Technical Field

[0001] This utility model relates to a high-safety cantilever beam scaffolding used in prefabricated high-rise building construction projects, and is particularly suitable for construction scenarios with short cantilever lengths (≤1.8m). Background Technology

[0002] In recent years, with the rapid development of civil construction and the continuous increase in building height, especially given the current shortage of residential land, most residential buildings are high-rises. However, due to the large amount of steel pipes and fasteners required for traditional ground-supported scaffolding, it becomes insufficient to meet construction needs as structural layers increase in height. In actual high-rise building projects, cantilever scaffolding is currently the most widely used method, achieving excellent results. For precast concrete frames with prestressed concrete (PC) beams as the main structural beams, the I-beams of traditional cantilever scaffolding need to penetrate the exterior wall panels and be fixed to the composite floor slab. However, embedding U-shaped anchor rings into the composite floor slab is inconvenient, makes on-site adjustments impossible, and leads to difficulties in later repairs. Utility Model Content

[0003] The technical problem this invention aims to solve is to optimize the design of cantilever scaffolding to improve safety and ease of construction, and to adopt a new type of cantilever beam scaffolding to avoid leaving I-beam holes in floor slabs and pre-embedding U-shaped anchor rings in composite slabs. The new cantilever scaffolding needs to meet requirements for strength, rigidity, and integrity, while also being lightweight, low-cost, safe, reliable, easy to install and dismantle, and reusable.

[0004] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: High-strength steel plates of 12mm×220mm×200mm are used, and a precisely calculated stress distribution design is adopted to ensure the stability of the cantilevered scaffolding. The cantilevered main beam uses 16# I-beams, and the I-beams are fastened to the concrete frame beams with two M20mm 8.8 grade high-strength bolts, providing a safety guarantee against pull-out and loosening. In addition, the scaffolding system is equipped with high-strength diagonal braces to enhance the overall rigidity and load-bearing capacity, thereby improving construction safety. One end of the 16# I-beam is fixed to the end of the I-beam with a turnbuckle diagonal brace, the top of the turnbuckle diagonal brace is connected to the concrete frame beam with high-strength bolts, and the bottom of the turnbuckle diagonal brace is connected to the lifting lug plate on the 16# I-beam with high-strength bolts. The cantilevered main beam uses 16# I-beams as the foundation of the cantilevered disc-lock scaffolding, including multiple longitudinal uprights, transverse horizontal bars and connectors. The steel pipe specifications are ф48mm×3.0mm. The longitudinal spacing of the main uprights is 1.5m; the transverse spacing of the uprights is 0.9m; and the step spacing of the horizontal bars is 2m. When the cantilevered layer is erected, the I-beams are fixed with diagonal bracing.

[0005] The cantilever main beam is fixed by welding I-beams and steel plates together, and then connecting them to the concrete frame beam with high-strength bolts to provide higher load-bearing capacity. Shear-strengthened pressure plates are installed at the connection points of the diagonal tie rods. The pressure plates are 6mm×60mm×60mm and 12mm×220mm×100mm in size, and are fixed with double nuts to ensure stable stress. The turnbuckles are made of M20 threaded steel rods with three 16mm diameter steel reinforcement bars on their outer side, allowing for adjustment of the stress state of the cantilever beam by rotation. The limiting structure at the connection between the cantilever main beam and the scaffold uprights uses a double-sided short steel reinforcement limiting method, with the short steel bars being no less than 80mm high, to prevent the uprights from slipping or shifting during construction.

[0006] Compared with existing technologies, the advantages of this utility model are: ① It has better versatility and high safety; ② It is easy to install and can be recycled and reused repeatedly without generating waste, meeting the requirements of green construction; ③ This utility model device can save labor, speed up construction progress, and save costs. This utility model device has been used multiple times in actual projects, proving that it can meet the requirements of strength, rigidity, and integrity. Compared with traditional methods, it increases the ease of operation and reliability of force bearing, and has the ability to be reused repeatedly, showing significant advantages in construction cycle and cost control, and can be promoted in similar projects. Attached Figure Description

[0007] Figure 1 A schematic diagram of the high-safety cantilever beam scaffolding for prefabricated buildings according to this utility model.

[0008] Figure 2 A side view of the upper node of the diagonal tie rod of this utility model.

[0009] Figure 3 A schematic diagram of the cross-section of the upper node of the diagonal tie rod of this utility model.

[0010] Figure 4 A side view of the cantilever beam and bolt connection node of this utility model.

[0011] Figure 5 A schematic diagram of the cross-section of the cantilever beam and bolt connection node of this utility model.

[0012] Figure 6 A schematic diagram of the inclined railing of this utility model.

[0013] Figure 7 A cross-sectional schematic diagram of the self-made turnbuckle for the inclined railing of this utility model.

[0014] Figure 8 Schematic diagram of the cantilever beam inclined end node of this utility model. Detailed Implementation

[0015] The maximum erection height of each section of this new type of cantilever scaffolding should not exceed 20m; the longitudinal spacing of the cantilever scaffolding along the building should be 1.50m, the transverse spacing of the uprights should be 0.9m, and the step spacing of the horizontal bars should be maintained at 2m; the angle between the diagonal tie rod and the cantilever beam should not be less than 45°; for cantilever sections with a large cantilever length (greater than 1.8m), double diagonal tie rods should be installed, and the double diagonal tie rods and the building structure should not share a single through-wall bolt connection; cantilever scaffolding located at the entrance or exit of passenger or freight elevators must be reinforced and can only be put into use after passing inspection. The reserved holes, embedded sleeves, and bolt holes of the diagonal tie rods on the cantilever beam must be of the correct specifications. The upper tension point and lower anchor point are usually set at the concrete ring beam or edge beam. For easy safety inspection, the bolts and nuts at the cantilever beam should be installed on the outside of the wall or beam to ensure that the nuts are not loose. The outer side of the upper tension point of the diagonal tie rod is equipped with a 6mm×60mm×60mm pressure plate and a 12mm×220mm×100mm pressure plate. Double nuts are provided on the outside of the pressure plate, and the exposed length of the bolts is not less than 10mm.

[0016] The present invention will be further described in detail below with reference to the drawings.

[0017] Figure 1 This utility model provides a schematic diagram of a high-safety cantilever beam scaffold for prefabricated buildings. The cantilever main beam uses 16# I-beams (1) as the foundation of the cantilever scaffold (7). One end is connected to the concrete frame beam (10) with M20 high-strength bolts (13), and the other end is connected to the diagonal brace (9) with high-strength bolts (8) through the lug plate (3). The steel pipe (7) has a specification of ф48mm×3.0mm. The longitudinal spacing of the scaffold uprights (7) is 1.5m; the transverse spacing of the uprights is 0.9m; the step distance of the horizontal bar (5) is 2m. When the cantilever layer is erected, the I-beams (1) are fixed with diagonal braces (9) with a diameter of 20mm. The top of the diagonal braces (9) with a diameter of 20mm is connected to the concrete frame beam (12) with high-strength bolts (11), and the bottom of the diagonal braces (9) is connected to the lug plate (3) with high-strength bolts (8). Two short steel bars (2) are welded to the upper flange (4) of the 16# I-beam (1), and the scaffold uprights (7) are fitted onto the short steel bars (2) to prevent the scaffold uprights (7) from shifting.

[0018] Figure 2A side view of the upper node of the diagonal tie rod of this utility model. The reserved holes, embedded sleeves (21), and bolts (20) of the diagonal tie rod on the cantilever beam must be of the correct specifications. The upper pull point and the lower anchor point are usually set at the concrete ring beam or the side beam (24). For the convenience of safety inspection, the bolts and nuts at the cantilever beam should be installed on the outside of the wall or beam (24) to ensure that the nuts (22) are not loose. The upper pull point of the diagonal tie rod is equipped with a 6mm×60mm×60mm pressure plate (19) and a 12mm×220mm×100mm pressure plate (18) on both sides. Double nuts (22) are provided on the outside of the pressure plate. The exposed length of the M20 high-strength bolt (20) is not less than 10mm. One end of the M20 high-strength bolt (20) is a fixed nut (23) and the other end is a double nut (22). The diagonal tie rod (10) is welded to the 12mm×220mm×100mm pressure plate (18).

[0019] Figure 3 A schematic diagram of the cross-section of the upper node of the diagonal tie rod of this utility model. The upper pull point of the diagonal tie rod is equipped with a 6mm×60mm×60mm pressure plate (19) and a 12mm×220mm×100mm pressure plate (18) on both sides. Double nuts (22) are provided on the outside of the pressure plates. The diagonal tie rod (10) is welded to the 12mm×220mm×100mm pressure plate (18).

[0020] Figure 4 A side view of the cantilever beam and bolt connection node of this utility model. The cantilever main beam uses 16# I-beam (1) as the foundation of the cantilever scaffold. One end is connected to the concrete frame beam (10) with M20 high-strength bolts (7, 8), and the other end is connected to the diagonal tie rod with high-strength bolts through the lug plate. Short steel bars (2) are welded to the upper flange (4) of the 16# I-beam (1), and the scaffold uprights are sleeved on the short steel bars (2) to prevent the scaffold uprights from slipping. The anchorage point of the cantilever beam is usually located at the concrete ring beam or the edge beam (10). For convenient safety inspection, the bolts and nuts at the cantilever beam should be installed on the outside of the wall or beam (10) to ensure that the nuts (25) are not loose. The M20 high-strength bolts are equipped with 6mm×60mm×60mm pressure plates (19) and 12mm×220mm×200mm pressure plates (3) on both sides. Double nuts (25) are provided on the outside of the pressure plates. The exposed length of the M20 high-strength bolts (7, 8) is not less than 10mm. One end of the M20 high-strength bolts (7, 8) is a fixing nut (23) and the other end is a double nut (25). The 16# I-beam (1) is welded to the 12mm×220mm×200mm pressure plate (3).

[0021] Figure 5A schematic diagram of the cross-section of the cantilever beam and bolt connection node of this utility model. A 16# I-beam (1) is welded to a 12mm×220mm×200mm pressure plate (3). A bolt hole (7) with a diameter of 22mm and an elliptical bolt hole (8) with a diameter of 22×30mm are opened on the 12mm×220mm×200mm pressure plate (3).

[0022] Figure 6 A schematic diagram of the inclined railing of this utility model. When the cantilevered layer is first erected, a 16# I-beam is fixed by a 20mm diameter round steel inclined tie rod (10). The top of the 20mm diameter round steel inclined tie rod (10) is connected to the concrete frame beam by a 12mm×220mm×100mm pressure plate (11) and a high-strength bolt (12). The bottom of the inclined tie rod (10) is connected to the lug plate on the 16# I-beam by a 12mm×220mm×100mm pressure plate (17) and a high-strength bolt (18). The upper and lower round steel diagonal bracing rods (10) are connected by self-made turnbuckles. The turnbuckles are welded together by two nuts (13) with a diameter of 50mm and a height of 60mm and three steel bar tie rods (14) with a diameter of 16mm on the outside. There is a reserved hole with a diameter of 20mm and threads on the inside of the nut. The lower end of the upper round steel diagonal bracing rod (10) and the upper end of the lower round steel diagonal bracing rod (10) are connected to the nuts (13) with threads. Rotating the three steel bar tie rods (14) with a diameter of 16mm can adjust the total length of the round steel diagonal bracing rods (10), thereby controlling the levelness and stress of the 16# I-beam.

[0023] Figure 7 A cross-sectional view of the self-made turnbuckle for the inclined railing of this utility model. The turnbuckle is made of two nuts (13) with a diameter of 50mm and a height of 60mm and three steel rods (14) with a diameter of 16mm on the outside. There is a reserved hole with a diameter of 20mm and threads on the inside of the nut. The lower end of the upper round steel inclined rod (10) and the upper end of the lower round steel inclined rod (10) are connected to the nuts (13) with threads. The total length of the round steel inclined rod (10) can be adjusted by rotating the three steel rods (14) with a diameter of 16mm.

[0024] Figure 8 A schematic diagram of the cantilever beam diagonal tie end node of this utility model. The cantilever main beam uses 16# I-beam (1) as the foundation of the cantilever scaffold. One end is connected to the concrete frame beam with M20 high-strength bolts, and the other end is connected to the diagonal tie rod with M20 high-strength bolts (4) through the lug plate (3). The lug plate (3) and the short steel bar (2) are welded to the upper flange (6) of the 16# I-beam (1). The scaffold uprights are inserted into the short steel bars (2) to prevent the scaffold uprights from slipping.

Claims

1. A high-safety cantilever beam scaffold for fabricated building, comprising: a cantilever main beam made of 16# I-beam, one end of which is fixed to a concrete frame beam by at least two M20 high-strength bolts and connected to a cable-stayed rod through a lifting lug plate; a cable-stayed rod, one end of which is connected to the end of the cantilever main beam and the other end of which is fixed to the concrete frame beam through high-strength bolts, the cable-stayed rod being made of a flower basket bolt structure and adjustable in length to enhance structural stability; a scaffold comprising a plurality of longitudinal upright poles, transverse horizontal poles and connecting members, wherein the upright poles are 1.5 m apart longitudinally and 0.9 m apart transversely, and the horizontal poles are 2 m apart.

2. The high safety cantilever beam scaffold for fabricated building according to claim 1, characterized in that, The fixing mode of the cantilever main beam is that the I-beam is welded with a steel plate as a whole and connected to the concrete frame beam through high-strength bolts to provide higher bearing capacity.

3. The high safety cantilever beam scaffold for fabricated building according to claim 1, characterized in that, The connection of the cable-stayed rod is provided with a shear-resistant reinforcing plate, the plate having specifications of 6mm×60mm×60mm and 12mm×220mm×100mm and being fixed through double nuts to ensure stable stress.

4. The high safety cantilever beam scaffold for fabricated building according to claim 1, characterized in that, The flower basket bolt adopts M20 threaded steel rod, the outer side of which is provided with three steel rod pullers with a diameter of 16mm, and the stress state of the cantilever beam can be adjusted by rotation.

5. The high safety cantilever beam scaffold for fabricated building according to claim 1, characterized in that, The limiting structure at the connection of the cantilever main beam and the upright poles of the scaffold adopts a double-sided short steel bar limiting mode, the height of the short steel bar being not less than 80mm to prevent the upright poles from slipping or deviating during construction.

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