Quickly-installed elevator steel structure body and manufacturing and assembling method thereof

Abstract

The invention belongs to the technical field of added elevators, and discloses a fast-assembly type added elevator steel structure main body and a preparation and assembly method thereof, and the fast-assembly type added elevator steel structure main body comprises a hoistway, a door frame and a corridor. The hoistway is composed of four vertical stand columns and a plurality of transverse beams, the ends of the beams are connected with the connecting faces of the stand columns through connecting pieces, each connecting piece comprises a pair of triangular pieces formed by three steel plates perpendicular to one another, a first plate is connected with the stand columns, a second plate is connected with the beams, and a third plate is an inclined strut reinforcing rib. The door frame comprises door head steel beams between the front stand columns, sill steel beams and landing door stand columns between the sill steel beams, the corridor is connected with the outer sides of the sill steel beams, and through holes in the ends of the edge beams are matched with kidney-shaped holes of the mounting bases to adjust the position. The square pipe joints of the front stand column and the rear stand column are staggered in position. The device is fast to install, stable in structure, convenient to adjust, convenient to overhaul and maintain and suitable for the elevator adding project of the existing building.

Description

Technical Field

[0001] The present invention belongs to the technical field of retrofitting elevators, and in particular relates to a quick-installation retrofitting elevator steel structure body and a preparation and assembly method thereof. Background Art

[0002] With the increasing demand for installing elevators in old residential areas and existing buildings, steel structure shafts are widely used due to their short construction period, small amount of on-site welding, and minimal disruption to residents' lives. However, the existing square tube steel structure shafts for installing elevators still have the following deficiencies in design and construction: 1. The component connection method is complicated and the installation efficiency is low Traditionally, connections between shaft beams and columns are made 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 a long construction period and difficulty in ensuring connection quality.

[0003] 2. Insufficient structural rigidity and poor stability Some existing connection nodes lack effective three-way reinforcement design, and are prone to deformation or loosening when subjected to concentrated force. Long-term use may affect the verticality and stability of the well.

[0004] 3. The corridor is inconvenient to install and adjust The traditional corridor lacks a flexible adjustment structure when connecting with the main body of the shaft, and it is difficult to compensate for errors in the front and back directions during installation, resulting in difficult alignment and long construction time.

[0005] 4. Inconvenient inspection and maintenance The end structure of the beam is closed, and it is not convenient to tighten and inspect the bolts from the inside during installation or subsequent maintenance, which increases the difficulty of maintenance.

[0006] 5. The column splicing position is unreasonable In existing designs, the square tube joints of the front and rear columns are often located at the same height, which easily forms a weak point in the same horizontal section, reducing the overall bending and torsional resistance.

[0007] Therefore, there is an urgent need for a quick-install elevator square tube steel structure main structure with reasonable structure, efficient installation, stable connection and easy maintenance to overcome the shortcomings of the existing technology. Summary of the Invention

[0008] In order to overcome the above technical problems, the present invention provides a quick-install elevator steel structure body and a preparation and assembly method thereof.

[0009] The present invention adopts the following technical solutions: The main structure of the square tube steel structure of the quick-installed elevator includes a shaft, a door frame and a corridor. The shaft consists of four vertical columns and several horizontal beams. The ends of the beams are connected to the connecting surfaces of the columns by connecting parts. The four columns are divided into two front columns and two rear columns; 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 is erected between the door head steel beam and the sill steel beam; the corridor is horizontally connected to the outside of the sill steel beam; each connecting part includes a pair of triangular parts, and the triangular parts are formed by three mutually perpendicular steel plates; among them, the first plate fits the connecting surface of the column and is bolted to the column, the second plate fits horizontally to the upper surface or lower surface of the end of the beam and is bolted to the beam, and the third plate is the diagonal bracing reinforcement rib of the first plate and the second plate, and the two triangular parts are symmetrical about the beam.

[0010] Preferably, the two paired triangular members are connected to form a whole through an outer plate, and the outer plate is attached to the outer side surface of the end of the crossbeam and is bolted to the crossbeam.

[0011] Preferably, one end of the outer plate close to the column is extended to form an extension plate, and the extension plate is attached to the outer side surface of the column and is bolted to the column.

[0012] Preferably, an operating opening is provided on the inner side surface of the end of the beam.

[0013] Preferably, the corridor includes side beams on both sides and a stepping part erected between the two side beams, the front and rear ends of the side beams are bolted to a mounting seat, the front end mounting seat is connected to the wall connecting piece, and the rear end mounting seat is connected to the sill steel beam; the end of the side beam is provided with two through holes in the left and right directions, and the side of the mounting seat is provided with two narrow waist holes in the front and back directions, and the through holes and waist holes are aligned and bolted.

[0014] Preferably, the facing surfaces of the front columns are provided with long waisted round holes arranged vertically and equidistantly.

[0015] Preferably, the columns are formed by connecting square tubes, and the connection of the square tubes is that the bottom end of the upper square tube is sleeved on the top end of the lower square tube and then fixed with bolts, and an inner lining plate is provided on the inner wall of the top end of the lower square tube to participate in the bolting. Except for the top of the well, the position of the square tube joint of the front column is staggered with the position of the square tube joint of the rear column.

[0016] Preferably, a diagonal tie rod mechanism is provided between the upper surface of the side beam and the corresponding front column for reinforcement. The diagonal tie rod mechanism includes a connecting plate 1 fixedly connected to the upper surface of the side beam, and a connecting plate 2 bolted to the long waisted round hole on the inner side of the front column. The two connecting plates are each connected to a diagonal tie rod facing each other, and the facing ends of the two diagonal tie rods are commonly connected to a two-way tightening bolt.

[0017] The present invention also discloses an assembling method for a main structure of a square tube steel structure for a quick installation elevator, which is applied to assembling the main structure of the square tube steel structure for a quick installation elevator, and comprises: S1. Assemble four columns of appropriate height according to the building height, wherein the square tube joint position of the front column is staggered with the square tube joint position of the rear column; S2. Connect the four columns using beams and connectors to form a shaft. The first plate of the triangular connector fits over the column connection surface and is bolted to the column. The second plate fits horizontally over the upper or lower surface of the beam end and is bolted to the beam. The third plate serves as a diagonal bracing reinforcement between the first and second plates. The two triangular plates are symmetrical about the beam. Access openings on the inner side of the beam end facilitate bolting of the beam. S3. Determine the door frame installation position based on the floor conditions and accurately bolt the door head and sill beams between the two front columns. S4. The front and rear ends of the corridor side beams are bolted to mounting brackets. The rear mounting bracket is welded to the outside of the sill steel beam, and the front mounting bracket is welded to the wall connection piece to connect to the wall side. Since the bolt holes of the mounting brackets are long and narrow, the relative position of the mounting brackets and the side beams can be adjusted front and back so that the length of the corridor can adapt to the vertical deviation of the wall. The side beams are reinforced by the diagonal rod mechanism.

[0018] Compared with the prior art, the present invention has the following beneficial effects: 1. Technological Innovation and Core Improvement 1. The design of the long waist round hole of the main column is convenient for industrial production and manufacturing, which improves production efficiency and manufacturing accuracy. Improve installation efficiency, 2. The design of high-strength torsional shear bolts makes installation faster, stronger and more reliable.

[0019] 3. The design of the positioning bolt makes the positioning more accurate and the connecting plate more stable 4. The unique double-triangular plate design eliminates the need for welding when installing elevator steel structure columns and beams, allowing for more stable and reliable full bolt connections. This simplifies manufacturing, improves manufacturing precision, and increases production efficiency, thereby improving on-site installation efficiency.

[0020] 5. Four long round holes are opened on the left and right beams to facilitate the installation of nuts on the main and auxiliary guide rail support frames, thereby improving the on-site installation accuracy and efficiency.

[0021] 6. The two diagonal column break joints are staggered to avoid the joints of the steel structure being at the same level. This increases the shear resistance of the steel structure and improves its strength.

[0022] 7. Long, round holes are designed throughout the inner side of the front columns. Adjustments can be made to accommodate varying floor heights on site. This eliminates the need to know the overall height of each floor, increasing the shaft's tolerance, improving installation efficiency, and reducing the difficulty of on-site measurements. The design can be adapted to changing site conditions, adding greater flexibility and applicability.

[0023] 8. The corridor is designed with adjustment holes to avoid deviations in the verticality of the wall. It can be adjusted by 5 to 8 cm, which increases the flexibility and applicability of on-site installation and improves installation efficiency.

[0024] 9. The steel structure and the corridor bridge are connected by a cable-suspended design. They are not connected to the original building where the elevator is installed. They are independently loaded to avoid tension and damage to the original building caused by typhoon and earthquake settlement caused by the new steel structure.

[0025] 10. The steel structure shaft for the new elevator is designed with full standardization, componentization, and assembly, and is fully bolted. This allows for factory prefabrication, on-site assembly, and hoisting. Depending on the site conditions, the structure can be assembled on-site, or completely assembled in the factory and transported to the site for hoisting. Flexible installation methods are available, ensuring high efficiency, high quality, and minimal disruption to residents, making this a green installation.

[0026] 11. The exterior curtain wall of the steel structure is customized with galvanized profiles, adopts physical waterproofing, does not require gluing, and is installed internally to avoid safety hazards caused by personnel operations outside the well, thereby improving the efficiency, safety, reliability and durability of the installation of the well curtain wall.

[0027] 12. The shaft curtain wall adopts a small glass design to reduce the self-explosion rate of the glass curtain wall by 0.03%, and reduce the high labor and mechanical equipment costs caused by the self-explosion of the glass.

[0028] 13. The bridge does not require pouring of floor slabs, which is stronger, does not require pouring, has a fast construction period and is less disturbing to residents.

[0029] 14. A square opening is opened on the left and right inner sides of the beam to facilitate the installation of bolts, making installation more convenient and quick.

[0030] 15. The breakpoint connection between the main columns of the steel structure adopts high-strength nuts welded with inner-lined steel plates, and the external part of the columns is connected with high-strength bolts, which has strong connection strength, high precision, improved efficiency and easy installation.

[0031] 16. The steel structure column base is connected by welding thickened steel plates and multiple reinforcement plates and bolts embedded in the concrete. The connection strength is high, which facilitates the vertical adjustment of the steel structure body and makes on-site installation simple, fast and efficient.

[0032] 2. Key points for improving efficiency 1. Manufacturing efficiency: The standardized design of the long waist round hole and double triangular plate of the main column enables factory prefabrication and mass production of components, reducing more than 90% of welding processes, controlling production accuracy within ±1mm, and shortening the production cycle by 50%.

[0033] All components are designed with standardized parameters, eliminating the need for individual customization for different floor heights. Common parts account for over 95%, significantly reducing the complexity of production and material preparation.

[0034] 2. On-site installation efficiency: High-strength torsional shear bolts realize the integrated operation of "installation-tightening-self-inspection", and the single-node installation time is shortened to 1 / 3 of that of traditional bolts; the positioning bolts ensure that the installation deviation of the connecting plate is ≤0.5mm, avoiding repeated adjustments.

[0035] The long round holes on the left and right beams simplify the installation of the guide rail support frame. The AB column adjustment holes do not require precise measurement of the height of each floor. The 5-8cm adjustment range of the corridor is compatible with the vertical deviation of the wall, and the overall installation efficiency is improved by more than 60%.

[0036] 3. Unique Advantages 1. Stability advantage of the full bolt connection system The double triangle plate design forms a rigid node between the column and the beam. Combined with the self-locking and anti-loosening properties of the high-strength torsional shear bolts, the connection strength is increased by 30% compared to welded nodes, and the loss of precision caused by thermal deformation of welding is avoided. The staggered design of the diagonal column interface eliminates the risk of stress concentration at joints on the same horizontal plane, and the overall shear strength of the structure is increased by 25%.

[0037] 2. The universal advantage of adaptive adjustment The full-length waist-shaped round holes on the inner side of the front columns enable stepless adjustment of floor height, solving the industry pain point of irregular floor heights in old buildings; the corridor adjustment holes are compatible with wall flatness deviations and do not require on-site secondary processing; the standardized design of the guide rail support frame mounting holes is suitable for elevator guide rails of different brands, and the collaborative design of this adjustment mechanism is unique.

[0038] 3. Safety, independence and green construction advantages The cable-suspended bridge connection completely mechanically separates the steel structure from the original building, avoiding secondary damage caused by typhoons, earthquakes, and subsidence. This independent force design is an industry first; the internal installation process of the exterior curtain wall eliminates the risk of high-altitude operations, and physical waterproofing replaces the gluing process to avoid leakage risks caused by colloid aging, and durability is increased to more than 20 years; the small glass design controls the self-explosion rate to below 0.3‰, which is 90% lower than traditional glass curtain walls and reduces maintenance costs by 80%.

[0039] 4. Advantages of full-process industrialization The standardized and assembled design of all components realizes "factory prefabrication - zero on-site processing", supports overall lifting or modular assembly, reduces on-site construction noise by 60%, and reduces construction waste by 90%, complying with the policy requirements for green installation of elevators. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is an overall schematic diagram of the present invention; Figure 2 yes Figure 1 A in the middle is an enlarged schematic diagram; Figure 3 This is a schematic diagram of the corridor; Figure 4 is a schematic diagram of a connecting piece in accordance with the first embodiment; Figure 5 This is a schematic diagram of a connecting piece in Example 2; Figure 6 This is a schematic diagram of a connecting piece in Example 3; Figure 7 It is a schematic diagram of the inclined tie rod structure of embodiment 4.

[0041] Description of reference numerals: 1. Front column; 11. Front pipe joint; 12. Long waist round hole; 2. Rear column; 21. Rear pipe joint; 3. Crossbeam; 31. Operation port; 4. Door frame; 41. Door head steel beam; 42. Hall door column; 43. Sill steel beam; 5. Corridor; 51. Mounting seat; 52. Side beam; 53. Wall connection piece; 54. Step part; 6. Connecting piece; 61. Triangle piece; 62. Outer plate; 63. Extension plate; 71. Connecting plate 1; 72. Connecting plate 2; 73. Diagonal brace; 74. Two-way tightening bolts. DETAILED DESCRIPTION

[0042] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings. The same or similar reference numerals throughout represent 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 intended only to explain the present invention and are not to be construed as limiting the present invention.

[0043] Example 1 The main structure of the square tube steel structure of the quick-install elevator includes a shaft top, a shaft, a door frame 4 and a corridor 5. The shaft is composed of four vertical columns and several horizontal beams 3. The ends of the beams 3 are connected to the connecting surfaces of the columns by connecting members 6. Each connecting member 6 includes a pair of triangular members 61. The triangular members 61 are formed by three mutually perpendicular steel plates; among them, the first plate fits the connecting surface of the column and is bolted to the column, the second plate fits the upper surface or lower surface of the end of the beam 3 horizontally and is bolted to the beam 3, and the third plate is the diagonal bracing reinforcement rib of the first plate and the second plate. The two triangular members 61 are symmetrical about the beam 3 up and down, and an operating port 31 is provided on the inner side surface of the end of the beam 3 to facilitate the corresponding bolting operation; the four columns are divided into two front columns 1 and two rear columns 2. The columns are formed by connecting square tubes. The connection of the square tubes is that the bottom end of the upper square tube is sleeved on the top of the lower square tube and then fixed with bolts, and a The inner lining plate is bolted together. Except for the top of the shaft, the front pipe joint 11 of the front column 1 is staggered with the rear pipe joint 21 of the rear column 2 to strengthen the strength of the shaft. The door frame 4 includes a door head steel beam 41 and a sill steel beam 43 horizontally bolted between the front columns 1. A vertical hall door column 42 is erected between the door head steel beam 41 and the sill steel beam 43. Long waist round holes 12 are arranged vertically and equidistantly on the facing surfaces of the front columns 1 to facilitate flexible installation of the door frame 4. 5 is horizontally connected to the outside of the sill steel beam 43. The corridor 5 includes side beams 52 on both sides and a stepping portion 54 spanned between the two side beams 52. The front and rear ends of the side beams 52 are bolted to mounting blocks 51. The front mounting block 51 is welded to a wall connection 53, and the rear mounting block 51 is welded to the sill steel beam 43. Two through holes are defined in the left and right directions at the ends of the side beams 52, and two narrow waist holes are defined in the front and rear directions on the sides of the mounting block 51. The through holes and waist holes are aligned and bolted together.

[0044] The crossbeam 3 is connected to the column through a pair of triangular members 61 composed of three steel plates, and bolts are used instead of on-site welding, which greatly improves the installation efficiency and reduces the difficulty of construction. The third plate of the triangular member 61 serves as a diagonal bracing reinforcement, which improves the three-dimensional stiffness and shear resistance of the node, ensuring that the shaft structure remains stable during long-term use. The through holes at the ends of the side beams 52 of the corridor 5 cooperate with the waist holes on the mounting seat 51, and the position can be fine-tuned in the front and back, left and right directions, solving the problem of on-site positioning errors and improving installation accuracy. An operating port 31 is provided on the inner side surface 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 pipe joints of the front column 1 and the rear column 2 are staggered to avoid the formation of weak sections at the same height, thereby improving the overall bending and torsional strength of the shaft.

[0045] The assembly method of the main structure of the square tube steel structure of the quick-installed elevator is applied to assemble the main structure of the square tube steel structure of the quick-installed elevator, comprising: S1. According to the height of the assembly of four columns suitable for the height of the building, wherein the square tube joint position of the front column 1 and the square tube joint position of the rear column 2 are staggered; S2. Connect the four columns using beams 3 and connectors 6 to form a shaft. The first plate of the triangular member 61 of the connector 6 fits over the connecting surface of the column and is bolted to the column. The second plate fits horizontally over the upper or lower surface of the end of beam 3 and is bolted to beam 3. The third plate serves as a diagonal bracing reinforcement between the first and second plates. The two triangular members 61 are symmetrical about beam 3. Access openings 31 on the inner side of the end of beam 3 facilitate bolting of beam 3. S3 determine the door frame installation position 4 according to the floor situation, the door head steel beam 41 and the sill steel beam 43 accurately bolted installed between the two front columns 1; S4. The front and rear ends of the side beams of the corridor 5 are respectively bolted to mounting bases 51. The rear end mounting base 51 is welded to the outside of the sill steel beam 43, and the front end mounting base 51 is welded to the wall connecting member 53 to connect to the wall side. Moreover, since the bolt holes of the mounting base 51 are long and narrow waist holes in the front and rear, the relative position of the mounting base 51 and the side beam can be adjusted front and back so that the length of the corridor 5 can adapt to the vertical deviation of the wall, and the diagonal rod 73 mechanism is used to reinforce the side beam 52.

[0046] Example 2 The difference between this embodiment and the first embodiment is that the two paired triangular pieces 61 are connected to form a whole through an outer plate 62. The outer plate 62 is attached to the outer side surface of the end of the beam 3 and bolted to the beam 3 to form an integral node, thereby reducing stress concentration.

[0047] Example 3 The difference between this embodiment and the second embodiment is that the outer plate 62 is extended at one end close to the column to form an extension plate 63. The extension plate 63 fits the outer side of the column and is bolted to the column, making the force path of the node more reasonable and reducing stress concentration.

[0048] Example 4 Based on any of the foregoing embodiments, this embodiment provides a diagonal tie rod 73 mechanism 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 long waisted circular hole 12 on the inner side of the front column 1. The two connecting plates are each connected to a diagonal tie rod 73 facing each other, and the facing ends of the two diagonal tie rods 73 are commonly connected to a two-way tightening bolt 74.

[0049] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to the above embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. The main structure of the square tube steel structure of the quick installation elevator includes the hoistway, door frame and corridor, which is characterized by: The hoistway consists of four vertical columns and several horizontal beams. The ends of the beams are connected to the connecting surfaces of the columns by connectors. The four columns are divided into two front columns and two rear columns. The door frame includes a door head steel beam and a sill steel beam horizontally installed between the front columns. The vertical hall door column is installed between the door head steel beam and the sill steel beam. The corridor is horizontally connected to the outside of the sill steel beam. Each connecting member includes a pair of triangular members, which are formed by three mutually perpendicular steel plates; among them, the first plate fits the connecting surface of the column and is bolted to the column, the second plate fits the upper surface or lower surface of the end of the beam horizontally and is bolted to the beam, and the third plate is the diagonal bracing reinforcement rib of the first and second plates. The two triangular members are symmetrical about the beam in the upper and lower directions.

2. The main structure of the square tube steel structure for the quick installation elevator according to claim 1 is characterized in that: The two paired triangular pieces are connected to form a whole through an outer side plate. The outer side plate is fitted on the outer side surface of the end of the crossbeam and is bolted to the crossbeam.

3. The main structure of the square tube steel structure for the quick installation elevator according to claim 2 is characterized in that: One end of the outer plate close to the column is extended to form an extension plate, which fits the outer side surface of the column and is bolted to the column.

4. The main structure of the square tube steel structure for the fast-installed elevator according to any one of claims 2 to 3, characterized in that: An operating opening is provided on the inner side surface of the end of the beam.

5. The main structure of the square tube steel structure for the quick installation elevator according to claim 4 is characterized in that: The corridor includes side beams on both sides and stepping parts erected between the two side beams. The front and rear ends of the side beams are bolted to mounting seats. The front mounting seat is connected to the wall connecting parts, and the rear mounting seat is connected to the sill steel beam. Two through holes in the left and right directions are opened at the end of the side beam, and two narrow waist holes in the front and back directions are opened on the side of the mounting seat. The through holes and waist holes are aligned and bolted.

6. The main structure of the square tube steel structure for the quick installation elevator according to claim 5 is characterized in that: Long waist round holes are arranged vertically and equidistantly on the facing surfaces of the front columns.

7. The main structure of the square tube steel structure for the quick installation elevator according to claim 6 is characterized in that: The columns are formed by connecting square tubes. The connection of the square tubes is that the bottom end of the upper square tube is connected to the top end of the lower square tube and then fixed with bolts. An inner lining plate is provided on the inner wall of the top end of the lower square tube to participate in the bolting. Except for the top of the wellbore, the position of the square tube joint of the front column is staggered with the position of the square tube joint of the rear column.

8. The main structure of the square tube steel structure for the quick installation elevator according to claim 7 is characterized in that: A diagonal tie rod mechanism is arranged between the upper surface of the side beam and the corresponding front column for reinforcement. The diagonal tie rod mechanism includes a connecting plate 1 fixedly connected to the upper surface of the side beam and a connecting plate 2 bolted to the long waisted round hole on the inner side of the front column. The two connecting plates are each connected to a diagonal tie rod facing each other, and the facing ends of the two diagonal tie rods are commonly connected to a two-way tightening bolt.

9. A method for assembling a main structure of a square tube steel structure for a fast-installed elevator, which is applied to assembling the main structure of a square tube steel structure for a fast-installed elevator according to claim 8, characterized in that: include: S1. Assemble four columns of appropriate height according to the building height, wherein the square tube joint position of the front column is staggered with the square tube joint position of the rear column; S2. Connect the four columns using beams and connectors to form a shaft. The first plate of the triangular connector fits over the column connection surface and is bolted to the column. The second plate fits horizontally over the upper or lower surface of the beam end and is bolted to the beam. The third plate serves as a diagonal bracing reinforcement between the first and second plates. The two triangular plates are symmetrical about the beam. Access openings on the inner side of the beam end facilitate bolting of the beam. S3. Determine the door frame installation position based on the floor conditions and accurately bolt the door head and sill beams between the two front columns. S4. The front and rear ends of the corridor side beams are bolted to mounting brackets. The rear mounting bracket is welded to the outside of the sill steel beam, and the front mounting bracket is welded to the wall connection piece to connect to the wall side. Since the bolt holes of the mounting brackets are long and narrow, the relative position of the mounting brackets and the side beams can be adjusted front and back so that the length of the corridor can adapt to the vertical deviation of the wall. The side beams are reinforced by the diagonal rod mechanism.

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