Quickly-installed and added inner square tube steel structure main structure of elevator

Abstract

The utility model belongs to elevator technology field, disclose a kind of fast installation retrofitting elevator inner square tube steel structure main structure, including hoistway, door frame and veranda.The hoistway is made of four vertical columns and several horizontal cross beams, and the cross beam end is connected between the column connecting surface by connecting piece, and the connecting piece includes a pair of triangular piece consisting of three mutually perpendicular steel plates, first sheet and column are connected, second sheet and cross beam are connected, and third sheet is inclined brace reinforcing bar.The door frame includes door head steel beam between front column, threshold steel beam and its hall door column, and veranda is connected with the outside of threshold steel beam, and the position can be adjusted by the cooperation of beam end through hole and mounting seat waist hole.The inner side of cross beam end is provided with operating port, and the inner square tube joint position of front column and rear column is staggered.The utility model is quick to install, and the structure is stable, and it is convenient to adjust, and hoistway area ratio is improved, and it is convenient to overhaul and maintain, and it is suitable for existing building retrofitting elevator engineering.

Description

Technical Field

[0001] This utility model belongs to the field of elevator retrofitting technology, specifically relating to the main structure of the square tube steel structure inside the quick-installation elevator retrofitting system. Background Technology

[0002] With the increasing demand for elevator installation in older residential communities and existing buildings, steel structure elevator shafts are widely used due to their short construction period, minimal on-site welding, and minimal disruption to residents' lives. However, existing square tube steel structure elevator shafts still have the following shortcomings in design and construction: 1. The shaft area needs to be increased. Traditional square tube columns occupy a large area, resulting in a small area inside the shaft. The area of ​​the shaft is the horizontal line connecting the edges of the four columns facing the shaft. The area of ​​the shaft needs to be increased by improving the shape of the columns.

[0003] 2. The component connection method is complex, resulting in low installation efficiency. Traditional shaft beams and columns are often connected by on-site welding or assembly of multiple plates. This not only requires high welding precision but is also limited by on-site space, resulting in long construction cycles and difficulty in ensuring connection quality.

[0004] 3. Insufficient structural stiffness and poor stability. Some existing connection nodes lack effective three-dimensional reinforcement design, which can easily lead to deformation or loosening when the stress is concentrated. Long-term use may affect the verticality and stability of the shaft.

[0005] 4. The column splicing position is unreasonable. In existing designs, the joints of the front and rear columns with square tubes are often at the same height, which can easily create weaknesses in the same horizontal section and reduce the overall bending and torsional resistance.

[0006] 5. Inconvenient installation and adjustment of the connecting corridor Traditional connecting corridors lack flexible adjustment structures when connecting to the main shaft, making it difficult to compensate for errors in the front and rear directions during installation, resulting in alignment difficulties and long construction time.

[0007] 6. Inconvenient inspection and maintenance The closed structure at the end of the beam makes it difficult to tighten and inspect bolts from the inside during installation or later maintenance, increasing the difficulty of maintenance.

[0008] Therefore, there is an urgent need for a quick-installation elevator internal square tube steel structure that is structurally sound, efficient to install, securely connected, and easy to maintain, in order to overcome the shortcomings of existing technologies. Utility Model Content

[0009] To overcome the above-mentioned technical problems, this utility model provides a quick-installation elevator internal square tube steel structure main structure.

[0010] The present invention adopts the following technical solution: The main structure of the quick-installation elevator features a square tube steel frame, including the shaft, door frame, and connecting corridor. The shaft consists of four vertical columns and several horizontal beams. The ends of the beams are connected to the columns via connectors. The four columns are divided into two front columns and two rear columns, each formed by connecting multiple inner square tubes. The connection between adjacent inner square tubes involves the bottom end of the upper inner square tube fitting over the top end of the lower inner square tube and then securing it with bolts. An inner lining plate is laid on the inner wall of the top end of the corresponding lower inner square tube for bolting. The lower half of the inner lining plate... Below the connecting section, it is bolted to the inner square tube below. The upper half of the inner lining plate overlaps with the connecting section and is bolted to the two inner square tubes below and above. Except for the top of the shaft, the position of the inner square tube joint of the front column is staggered from the position of the inner square tube joint of the rear column. The inner square tube is formed by folding one corner of the square tube inward, with the notched corner facing inward. The door frame includes a door head steel beam and a sill steel beam horizontally erected between the front columns. A vertical hall door column is erected between the door head steel beam and the sill steel beam. The connecting corridor is horizontally connected to the outside of the sill steel beam. Each connector includes a pair of triangular pieces, each formed by three mutually perpendicular steel plates. The first plate is attached to the connecting surface of the column and bolted to the column. The second plate is horizontally attached to the upper or lower surface of the end of the crossbeam and bolted to the crossbeam. The third plate serves as a diagonal bracing reinforcement for the first and second plates. The two triangular pieces are symmetrical about the crossbeam. The two triangular pieces are connected to an outer plate via the second plate to form a whole. The outer plate is attached to the outer side of the end of the crossbeam and bolted to the crossbeam. The end of the outer plate near the column is extended to form an extension plate, which is attached to the outer side of the column and bolted to the column.

[0011] An operating port is provided on the inner side of the end of the crossbeam.

[0012] The connecting corridor includes side beams on both sides and a stepping area between the two side beams. Mounting seats are bolted to both ends of the side beams. The mounting seats at the front end are connected to the wall tie and the mounting seats at the rear end are connected to the steel beam of the sill. Two through holes in the left and right directions are opened at the ends of the side beams. Two narrow waist holes in the front and back directions are opened on the side of the mounting seats. The through holes and waist holes are aligned and bolted together.

[0013] The front pillars have oblong holes arranged vertically and equidistantly on their facing surfaces.

[0014] A diagonal bracing mechanism is installed between the upper surface of the side beam and the corresponding front column for reinforcement. The diagonal bracing mechanism includes a connecting plate 1 fixedly connected to the upper surface of the side beam and a connecting plate 2 bolted to the elongated oval hole on the inner side of the front column. Each of the two connecting plates is connected to a diagonal bracing rod facing the other, and the opposing ends of the two diagonal bracing rods are threaded together to a bidirectional tightening screw.

[0015] Compared with the prior art, the beneficial effects of this utility model are: I. Main Features: 1. The elongated, cylindrical hole design of the column facilitates industrial production and manufacturing, improving production efficiency and manufacturing precision. It also enhances installation efficiency; the use of high-strength torsion-shear bolts at the bolt joints results in faster, more secure, and more reliable installation.

[0016] 2. The design of the inner square tube reduces the footprint of the column and increases the shaft area.

[0017] 3. Positioning bolts are used at the bolt joints to make the positioning more accurate and the connecting plates more stable.

[0018] 4. The unique double-triangle plate design allows for a more robust and reliable all-bolt connection between the columns and beams of the elevator steel structure, eliminating the need for welding. This simplifies manufacturing, improves precision, and increases production efficiency, thereby enhancing on-site installation efficiency.

[0019] 5. Four elongated oval holes are made on the left and right crossbeams to facilitate the installation of nuts on the main and auxiliary guide rail support frames, thereby improving the installation accuracy and efficiency on site.

[0020] 6. The joints of the two diagonal columns are staggered to prevent the steel structure joints from being on the same level. This increases the shear resistance of the steel structure and improves its strength.

[0021] 7. The entire inner side of the front column is designed with an elongated oval hole. This allows for adjustment based on the different floor heights on site. It eliminates the need to know the height of each individual floor, only the overall floor height, increasing the shaft's tolerance, improving on-site installation efficiency, and reducing the difficulty of on-site measurements. It adapts to changing site conditions, increasing flexibility and applicability.

[0022] 8. The connecting corridor features an adjustable length design to prevent deviations in wall verticality. The adjustable length is 5-8cm, increasing the flexibility and applicability of on-site installation and improving installation efficiency.

[0023] 9. The steel structure main body is connected to the corridor bridge using a suspended design with a tie rod mechanism. This avoids a strong connection between the steel structure and the original building where the elevator is installed. It bears load independently, preventing tensile stress and damage to the original building caused by the newly added steel structure during typhoons, earthquakes, or settlement.

[0024] 10. The steel structure shaft of the elevator is designed using a fully standardized, modular, and prefabricated approach, with all connections made by bolts. This allows for factory prefabrication, on-site assembly, and hoisting. Depending on the site conditions, assembly can be done on-site or fully assembled in the factory and transported to the site for hoisting, offering flexible installation options. It is efficient, high-quality, and minimizes disturbance to residents, achieving a green installation.

[0025] 11. The exterior curtain wall of the steel structure is made of galvanized profiles and uses physical waterproofing. It does not require glue and is installed internally, avoiding safety hazards caused by personnel operating outside the shaft. This improves the efficiency, safety, reliability and durability of the installation shaft curtain wall.

[0026] 12. The shaft curtain wall adopts a small glass design, which reduces the spontaneous breakage rate of the glass curtain wall by 0.3%, and reduces the large amount of labor and mechanical equipment costs for maintenance and replacement caused by spontaneous glass breakage.

[0027] 13. The covered bridge uses precast concrete decking, which is stronger, requires no pouring, has a fast construction period, and causes less disturbance to residents.

[0028] 14. A square opening is made on the inner left and right sides of the crossbeam to facilitate bolt installation, making installation easier and faster.

[0029] 15. The discontinuity connection between the main steel structure columns is made of high-strength nuts welded with inner steel plates, and high-strength bolts are used for connection on the outside of the columns. The connection is strong, accurate, efficient and easy to install.

[0030] 16. The steel structure column base is connected by welding thickened steel plates and multiple reinforcing plates with bolts embedded in the concrete. The connection strength is high, which facilitates the verticality adjustment of the main steel structure and makes on-site installation simple, quick and efficient.

[0031] II. Core Technology Innovation and Breakthrough Design This retrofitted elevator shaft, with its square steel structure, overcomes the technical bottlenecks of traditional steel shafts in terms of spatial adaptability, installation efficiency, structural safety, and environmental friendliness through systematic structural innovation, optimized connection mechanisms, material and process innovation, and the construction of an industrial system. It forms an original technical solution covering the entire process of "design-production-installation-operation and maintenance," with its core innovation reflected in the synergistic innovation of six major technical systems: 1. All-bolt weldless connection system—modular node design The innovative "double triangular plate + high-strength torsion shear bolt + positioning bolt" collaborative connection structure completely replaces the traditional welding process. Double triangular plate connection node: The force transmission between the column and the beam is achieved through the surface contact of the triangle stability principle. With the help of positioning bolts (deviation ≤0.5mm), the connection plate is accurately aligned. The connection strength is increased by 30% compared with the welded node, and the ±5mm accuracy error caused by welding thermal deformation is avoided. High-strength torque-shear bolts: Equipped with torque detection function, they achieve integrated "installation-tightening-self-inspection", reducing the installation time of a single node to 1 / 3 of that of traditional bolts; The main column features elongated oval holes: standardized prefabricated hole positions combined with bolt fine-tuning improve the on-site assembly efficiency of factory-prefabricated components by 50%, solving the industry pain point of "on-site drilling adaptation".

[0032] 2. Dynamic Adaptive Adjustment System – Full-Scenario Compatibility Design A "multi-level adjustment + fault-tolerant adaptation" system was constructed to solve the problem of irregular dimensions in old buildings: AB column full-range adjustment mechanism: The inner long oval hole enables stepless adjustment of floor height within ±10cm, eliminating the need for precise measurement of each floor height (only the total height of the entire staircase is required), reducing the difficulty of on-site measurement by 80%; Corridor and beam adjustment: The 5-8cm adjustment holes in the corridor are compatible with wall flatness deviations, and the four sets of elongated oval holes on the left and right beams simplify the installation of the guide rail support frame, improving the positioning accuracy to ±0.5mm; Synergistic adjustment effect: The multi-level adjustment mechanism increases the tolerance of the wellbore to on-site dimensional deviations to 3 times that of traditional designs, covering more than 95% of complex installation scenarios.

[0033] 3. Independent safety load-bearing system – zero-interference design with the original building The innovative "offset joint + suspension cable" structure completely eliminates mechanical interference with the original building. Diagonal column misalignment interface: The joints are not distributed on the same horizontal plane, which eliminates stress concentration, increases the shear strength of the structure by 25%, and also has the function of visual inspection of joints; Suspension-supported aerial walkway connection: The main steel structure is completely mechanically separated from the original building, and the additional forces generated by earthquakes, typhoons and settlement are released through suspension cables to avoid cracking of the original building walls or damage to the foundation; Precast high-strength precast concrete decking replaces traditional concrete pouring, increasing strength by 20%, shortening construction time by 90%, and eliminating the problem of wet construction disturbing residents.

[0034] 4. Space optimization and strength synergy system – compact and efficient design A unique solution for synergistic "size reduction + strength enhancement" in square steel structures: Inner square tube irregular column: Compared with traditional square tube, the width and depth are reduced by 20cm each (the total floor area is reduced by 30%), and the bending strength is increased by 15% through cross-section optimization (internal reinforcing ribs), breaking through the limitation of "cannot be installed in narrow spaces"; The square opening design on the inner side of the crossbeam: a pre-set operating channel is matched with bolt installation tools, reducing the installation time of a single bolt from 3-5 minutes to 1 minute, solving the problem of "limited space for bolt installation"; - Column-level connection: The inner steel plate is welded with high-strength nuts and external bolts, which increases the pull-out strength by 40%, improves on-site assembly efficiency by 80%, and is compatible with compact space operation.

[0035] 5. Green Industrialized Construction System – High-Efficiency and Low-Disruption Design Green installation is achieved by adopting a "fully standardized + dual-mode assembly" approach: - Full-process industrialization: 100% of components are prefabricated in the factory (95% of them are general-purpose parts), supporting "integrated assembly in the factory followed by hoisting" or "modular assembly on site", reducing the installation cycle of a single shaft from 15 days to 3-5 days; - Low-disruption construction characteristics: The all-bolted connection achieves "zero welding and zero dust", reducing construction noise by 60% and construction waste by 90%, which meets the requirements of green installation policy; - Quick column base installation: Thickened steel plate base + multiple reinforcing plates welded together, with pre-embedded bolts and double nuts for adjustment, verticality deviation is controlled within 1 / 1000, and the installation time of a single column base is shortened to 30 minutes (traditionally it takes 2 hours).

[0036] 6. Exterior System Integration Architecture – Safe and Durable Design Innovative "galvanized profile + small glass + physical waterproofing" curtain wall system: Physical waterproofing process: Galvanized profile tongue and groove interlocking structure replaces caulking, extending durability from 5 years to 20 years and eliminating the risk of leakage; Small glass design: single pane area ≤ 0.5㎡, spontaneous breakage rate reduced from 3‰ to 0.3‰, annual maintenance cost reduced by 80%; - Internal installation process: The entire curtain wall installation is carried out internally, avoiding the risks of working at heights and increasing installation efficiency by 50%.

[0037] III. Quantitative Indicators for Efficiency Improvement 1. Manufacturing: The all-bolt, weld-free design reduces welding processes by 90%, factory prefabrication shortens the cycle by 50%, and standardized components reduce material preparation complexity by 70%; 2. On-site installation: Multi-level adjustment and quick connection structure reduce the installation time of a single elevator from 15 days to 3-5 days, and reduce labor costs by 60%; 3. Space adaptability: The internal square tube column expands the installation scenarios by more than 30%, solving the industry pain point of "no installation due to narrow space"; 4. Maintenance costs: The small glass panel and physical waterproof design reduce annual maintenance costs by 80% and extend the structural lifespan to more than 30 years.

[0038] IV. Unique Technical Features: 1. Double triangular plate connection structure: The scope includes the shape of the triangular connecting plate, the connection method with the column / beam, and the configuration parameters of the positioning bolts; 2. Irregularly shaped column with inner square tube: its dimensional parameters (width and depth minus 20cm), internal reinforcing rib structure and adaptation method in narrow spaces; 3. Multi-level adjustment mechanism: the distribution of the oblong holes in the AB columns, the 5-8cm parameter of the connecting corridor adjustment holes, and the adaptation relationship between the oblong holes in the crossbeams and the guide rails; 4. Suspension cable connection: Protects the "zero rigidity connection" structure between the covered bridge and the original building, the force transmission path of the suspension cables, and their installation location; 5. Precast concrete decking: its precast profile materials, connection points with the corridor bridge, and precast concrete assembly process; 6. Square opening inside the crossbeam: dimensions, location layout, and compatibility parameters with bolt installation tools; 7. Inter-column connection: welding position of inner steel plate, fit between nuts and external bolts, and stress transmission structure; 8. Column base adjustment structure: thickened steel plate, reinforced plate layout, and double nut verticality adjustment operation method; 9. Exterior system: tongue and groove structure for physical waterproofing, small glass size parameters (≤0.5㎡), internal installation process steps; 10. Industrialization system: Dual-mode adaptation parameters for "factory overall assembly + on-site hoisting" and "modular on-site assembly".

[0039] Summarize: Through systematic innovation in six major technological systems, the five major pain points of elevator retrofitting—limited space, inefficient installation, interference with existing buildings, safety hazards, and high maintenance costs—have been solved. Core technological features (such as double triangular plate connections, irregular internal square tube structures, and suspended cable design) demonstrate significant novelty and creativity. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 yes Figure 1 Enlarged view of point A in the middle; Figure 3 This is a schematic diagram of the connection method between the beam and the column; Figure 4 This is a schematic diagram of the column assembly method; Figure 5 This is a schematic diagram of a tie rod mechanism.

[0041] Explanation of reference numerals in the attached figures: 1. Front column; 11. Front inner square tube joint; 2. Rear column; 21. Rear inner square tube joint; 3. Horizontal beam; 31. Operating opening; 4. Door frame; 41. Door head steel beam; 42. Hall door column; 43. Sill steel beam; 5. Connecting corridor; 51. Mounting base; 52. Side beam; 53. Wall tie; 54. Step section; 6. Connecting piece; 61. Triangular piece; 62. Outer side plate; 63. Extension plate; 71. Connecting plate one; 72. Connecting plate two; 73. Diagonal tie rod; 74. Two-way tightening screw. Detailed Implementation

[0042] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings. Throughout the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions. Unless otherwise specified, the raw materials and equipment used are commercially available or commonly used in the art. The methods in the embodiments, unless otherwise specified, are conventional methods in the art. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0043] The main structure of the quick-installation elevator features an internal square tube steel structure, including a shaft, door frame 4, and connecting corridor 5. The shaft consists of four vertical columns and several horizontal beams 3. The ends of the beams 3 are connected to the columns via connectors 6. The four columns are divided into two front columns 1 and two rear columns 2. Each column is formed by connecting multiple internal square tubes. The connection between adjacent internal square tubes involves the bottom end of the upper internal square tube fitting over the top end of the lower internal square tube and then securing it with bolts. An inner lining plate is laid on the inner wall of the top end of the corresponding lower internal square tube for bolting. The lower half of the inner lining plate is below the fitting section and bolted to the lower internal square tube, while the upper half overlaps with the fitting section and is bolted to the corresponding upper and lower internal square tubes. Except for the top of the shaft, the position of the front internal square tube joint 11 of the front column 1 is the same as that of the rear internal square tube joint 11 of the rear column 2. The pipe joints 21 are staggered; the inner square tube is formed by folding one corner of the square tube inward, with the missing corner facing the shaft; the door frame 4 includes a door head steel beam 41 and a sill steel beam 43 horizontally erected between the front columns 1, and a vertical hall door column 42 erected between the door head steel beam 41 and the sill steel beam 43; the connecting corridor 5 is horizontally connected to the outside of the sill steel beam 43; the connecting corridor 5 includes side beams 52 on both sides and a stepping section 54 erected between the two side beams 52, with mounting seats 51 bolted to both ends of the side beams 52, the front mounting seat 51 connected to the wall tie 53, and the rear mounting seat 51 connected to the sill steel beam 43; the end of the side beam 52 has two through holes in the left and right directions, and the side of the mounting seat 51 has two narrow waist holes in the front and back directions, with the through holes and waist holes aligned and bolted together. The two front columns 1 have oblong holes arranged vertically and equidistantly on their facing surfaces. The installation height of the door frame 4 and the connecting corridor 5 can be flexibly arranged according to the actual situation.

[0044] Each connector 6 includes a pair of triangular pieces 61, each formed by three mutually perpendicular steel plates. The first plate is attached to the connecting surface of the column and bolted to it. The second plate is horizontally attached to the upper or lower surface of the end of the crossbeam 3 and bolted to it. The third plate serves as a diagonal bracing reinforcement for the first and second plates. The two triangular pieces 61 are symmetrical about the crossbeam 3. The two triangular pieces 61 are connected to an outer plate 62 via the second plate, forming a single unit. The outer plate 62 is attached to the outer side of the end of the crossbeam 3 and bolted to it. The end of the outer plate 62 near the column extends to form an extension plate 63, which is attached to the outer side of the column and bolted to it. An operating port 31 is provided on the inner side of the end of the crossbeam 3 for easy installation of bolts and subsequent maintenance from inside the shaft.

[0045] A diagonal tie rod 73 mechanism is installed between the upper surface of the side beam 52 and the corresponding front column 1 for reinforcement. The diagonal tie rod 73 mechanism includes a connecting plate 1 71 fixedly connected to the upper surface of the side beam 52 and a connecting plate 2 72 bolted to the elongated oval hole on the inner side of the front column 1. Each of the two connecting plates is connected to a diagonal tie rod 73 facing the other. The opposing ends of the two diagonal tie rods 73 are threaded together to a bidirectional tightening screw 74.

[0046] Quick-installation elevator internal square tube steel structure main structure, during use: The inner square tube shape reduces the footprint of the column and increases the area within the shaft. The crossbeam 3 is connected to the column via a pair of triangular members 61 composed of three steel plates. Bolting replaces on-site welding, significantly improving installation efficiency and reducing construction difficulty. The third plate of the triangular member 61 acts as a diagonal brace, enhancing the three-dimensional stiffness and shear resistance of the joint, ensuring the stability of the shaft structure during long-term use. The two triangular members 61 are connected by an outer plate 62 to form a single unit. The outer plate 62 is attached to the outer side of the end of the crossbeam 3 and bolted to it, forming an integral joint and reducing stress concentration. The end of the outer plate 62 closest to the column extends to form an extension plate 63, which is attached to the outer side of the column and bolted to it, making the stress path of the joint more rational and reducing stress concentration. The through hole at the end of the side beam 52 of the connecting corridor 5 matches the waist hole on the mounting base 51, allowing for fine-tuning of the position in the front-back and left-right directions, solving on-site alignment errors and improving installation accuracy. An operating port 31 is provided on the inner side of the end of the crossbeam 3 to facilitate the installation, tightening, or later maintenance of bolts, thereby improving the maintainability of the structure. The square tube joints of the front column 1 and the rear column 2 are staggered to avoid the formation of a weak section at the same height, thus improving the overall bending and torsional strength of the shaft.

[0047] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to the above embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A quick-installation elevator internal square tube steel structure main structure, including shaft, door frame and connecting corridor, characterized in that, The shaft consists of four vertical columns and several horizontal beams. The ends of the beams are connected to the columns via connectors. The four columns are divided into two front columns and two rear columns. Each column is formed by connecting multiple inner square tubes. The connection between adjacent inner square tubes is achieved by fitting the bottom end of the upper inner square tube onto the top end of the lower inner square tube and then securing it with bolts. An inner lining plate is laid on the inner wall of the top end of the lower inner square tube to participate in the bolting. The lower half of the inner lining plate is located below the fitting section and bolted to the lower inner square tube. The upper half of the inner lining plate overlaps with the connecting section and is bolted to the two inner square tubes at the bottom and top. Except for the top of the shaft, the inner square tube joints of the front column and the rear column are staggered. The inner square tube is formed by folding one corner of the square tube inward, with the notched corner facing inward. The door frame includes a door head steel beam and a sill steel beam horizontally erected between the front columns, and a vertical hall door column erected between the door head steel beam and the sill steel beam. The connecting corridor is horizontally connected to the outside of the sill steel beam. Each connector includes a pair of triangular pieces, each formed by three mutually perpendicular steel plates. The first plate is attached to the connecting surface of the column and bolted to the column. The second plate is horizontally attached to the upper or lower surface of the end of the crossbeam and bolted to the crossbeam. The third plate serves as a diagonal bracing reinforcement for the first and second plates. The two triangular pieces are symmetrical about the crossbeam. The two triangular pieces are connected to an outer plate via the second plate to form a whole. The outer plate is attached to the outer side of the end of the crossbeam and bolted to the crossbeam. The end of the outer plate near the column is extended to form an extension plate, which is attached to the outer side of the column and bolted to the column.

2. The main structure of the quick-installation elevator internal square tube steel structure according to claim 1, characterized in that, An operating port is provided on the inner side of the end of the crossbeam.

3. The main structure of the quick-installation elevator internal square tube steel structure according to claim 1, characterized in that, The connecting corridor includes side beams on both sides and a stepping area between the two side beams. Mounting seats are bolted to both ends of the side beams. The mounting seats at the front end are connected to the wall tie and the mounting seats at the rear end are connected to the steel beam of the sill. Two through holes in the left and right directions are opened at the ends of the side beams. Two narrow waist holes in the front and back directions are opened on the side of the mounting seats. The through holes and waist holes are aligned and bolted together.

4. The main structure of the quick-installation elevator internal square tube steel structure according to claim 3, characterized in that, The front pillars have oblong holes arranged vertically and equidistantly on their facing surfaces.

5. The main structure of the quick-installation elevator internal square tube steel structure according to claim 4, characterized in that, A diagonal bracing mechanism is installed between the upper surface of the side beam and the corresponding front column for reinforcement. The diagonal bracing mechanism includes a connecting plate 1 fixedly connected to the upper surface of the side beam and a connecting plate 2 bolted to the elongated oval hole on the inner side of the front column. Each of the two connecting plates is connected to a diagonal bracing rod facing the other, and the opposing ends of the two diagonal bracing rods are threaded together to a bidirectional tightening screw.

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