A connecting device for upper and lower module beams of a bolt-hole-free steel structure modular building

Abstract

The present invention discloses a connecting device for upper and lower module beams of a bolt - hole - free steel - structure module building, belonging to the technical field of connecting upper and lower module beams. It includes a module beam reinforcement structure, a large gear, a small - gear screw, a long - strip pressure block, a gear slide plate, and a push - pull slide plate; the module beam reinforcement structure is in a "C" - shaped structure; the large gears are arranged oppositely on the inner side surface of the module beam reinforcement structure; the small - gear screws are arranged at the upper and lower opposite positions of the module beam reinforcement structure and form a gear transmission cooperation with the large gears; the long - strip pressure block is fixedly connected to the symmetrically arranged upper and lower small - gear screws; the push - pull slide plate is slidably connected to a sliding through - groove, the gear slide plate forms a gear transmission cooperation with the large gear, and the gear slide plate is fixedly connected to the push - pull slide plate. The module beam connecting device adopting the above structure can form a tight mechanical bite, replace the single - point force - bearing mode of traditional bolts and welding, and can effectively resist the combined action of bending moment, shear force and axial force.

Description

Technical Field

[0001] The present invention relates to the technical field of upper and lower module beam connections, and more particularly to a connection device for upper and lower module beams of a steel structure module building without bolt holes. Background Art

[0002] Modular steel structure building structures have begun to attract the attention of the industry due to their unique advantages compared to traditional building structures. These advantages include: fast construction speed and short construction time; factory prefabrication is possible, with controllable quality, less resource waste, and a significant reduction in carbon emissions; internal pipeline laying and equipment installation and other internal decorations can be carried out in advance, greatly shortening the construction period of the building.

[0003] A modular steel structure building is a new type of building structure system, which means that the building structure is disassembled, and each room in the building is used as an independent module unit. The module units are industrially produced in a factory, then transported to the construction site, and finally the module units are connected together by a reliable connection method to form an integral building.

[0004] The connection method between module units will directly affect the bearing capacity, stiffness, seismic performance, installation efficiency and design method of modular steel structure buildings.

[0005] Currently, most of the connections between modular steel structure building modules are still carried out by welding or bolt connection between beam-column joint areas, which will have the following problems: The beams between the upper and lower modules need to bear vertical loads (self-weight, live load) and horizontal loads (wind, earthquake), and the strength and stiffness of the connection nodes directly affect the overall structural stability. The connection between the upper and lower module beams needs to resist the combined action of bending moment, shear force and axial force. Traditional welding or bolt connection is easy to form weak links. The alignment error between modules during on-site installation may cause connection failure, and reinforcement design is required to compensate for the deviation. Long-term dynamic loads (such as wind vibration) or environmental corrosion may weaken the node performance, and local anti-fatigue ability needs to be enhanced. Welding connection has low construction efficiency, residual stress is easily generated in the heat affected zone, and high requirements for on-site operation. Bolt connection depends on pre-tightening force and hole position accuracy, has insufficient seismic ductility, and is easy to slip or break under large earthquakes. As modular buildings develop towards high-rise (such as above 30 floors), the requirements for node stiffness and lateral displacement resistance ability are significantly improved. In earthquake-prone areas, the nodes need to have ductility energy dissipation ability, and traditional rigid connections are difficult to meet. Summary of the Invention

[0006] The purpose of the present invention is to provide a connection device for upper and lower module beams of a steel structure module building without bolt holes to solve the above problems existing in the current use of welding or bolt connection for upper and lower module beams.

[0007] To achieve the above object, the present invention provides a connecting device for upper and lower module beams of a bolt - hole - free steel - structure module building. A connecting device for upper and lower module beams of a bolt - hole - free steel - structure module building is characterized by comprising a module - beam reinforcement structure, a large gear, a small - gear screw, a long strip pressure block, a gear slide plate and a push - pull slide plate;

[0008] The module - beam reinforcement structure is a "C" - shaped integral structure, and two symmetrically arranged sliding through - slots are opened on its side surface;

[0009] The large gears are arranged oppositely on the inner side surface of the module - beam reinforcement structure, are connected to the module - beam reinforcement structure by bolts, and are symmetrically distributed on the module - beam reinforcement structure;

[0010] The small - gear screws are arranged at the upper and lower relative positions of the module - beam reinforcement structure, are symmetrically arranged up and down on the module - beam reinforcement structure, are threadedly connected to the module - beam reinforcement structure, and form a gear transmission cooperation with the large gears;

[0011] Two long strip pressure blocks are provided, and are respectively fixedly connected to the upper and lower symmetrically arranged small - gear screws by screws. The two long strip pressure blocks move relatively under the drive of the small - gear screws;

[0012] The gear slide plate and the push - pull slide plate are respectively arranged on both sides of the side surface of the module - beam reinforcement structure. The push - pull slide plate is slidably connected to the sliding through - slot of the module - beam reinforcement structure. The gear slide plate forms a gear transmission cooperation with the large gear, and the gear slide plate is fixedly connected to the push - pull slide plate by bolts.

[0013] Preferably, in the above - mentioned connecting device for upper and lower module beams of a bolt - hole - free steel - structure module building, the large gear and the small - gear screw form a gear transmission cooperation, and the diameter of the large gear is larger than the diameter of the meshing end of the small - gear screw, forming a speed - reducing transmission structure.

[0014] Preferably, in the above - mentioned connecting device for upper and lower module beams of a bolt - hole - free steel - structure module building, inward - threaded grooves are provided at the positions corresponding to the small - gear screws on the upper and lower inner surfaces of the module - beam reinforcement structure. The screw end of the small - gear screw is in threaded cooperation with the threaded groove, and the long strip pressure block is driven to squeeze towards the middle of the module beam by rotation.

[0015] Preferably, in the above - mentioned connecting device for upper and lower module beams of a bolt - hole - free steel - structure module building, an axial displacement compensation space is provided inside the large gear, so that when the small - gear screw drives the long strip pressure block to move, displacement deviation occurs without failure.

[0016] Preferably, in the above-described connecting device for upper and lower module beams of a boltless steel structure module building, the bolt connection holes of the gear slide plate and the push-pull slide plate are all standard prefabricated holes, eliminating the need for on-site drilling.

[0017] Preferably, in the above-described connecting device for upper and lower module beams of a boltless steel structure module building, the construction method of the upper and lower module beam connecting device is as follows:

[0018] Lift the upper module directly above the lower module, initially align it through the positioning pins at the ends of the upper and lower module beams, and place the assembled upper and lower module beam connecting device at the upper and lower module beams;

[0019] Move the push-pull slide plate to drive the gear slide plate to engage and rotate the large gear. The large gear is set for screw drive with the small gear, thereby driving the small gear screw to rotate;

[0020] When the small gear screw rotates, the screw end cooperates with the internal threaded groove of the module beam reinforcement structure, driving the symmetrically arranged long pressure blocks above and below to move synchronously towards the middle of the module beam;

[0021] The symmetrically arranged long pressure blocks above and below form opposite forces on the upper and lower module beams, realizing the connection of the upper and lower module beams. Finally, confirm that all components are installed in place.

[0022] Therefore, the connecting device for upper and lower module beams of a boltless steel structure module building adopting the above structure has the following beneficial effects:

[0023] (1) Boltless hole extrusion connection: The long pressure blocks are driven by the small gear screw to extrude towards the middle of the module beam, forming a tight mechanical bite, replacing the single-point stress mode of traditional bolts and welding. It can effectively resist the combined action of bending moment, shear force and axial force, and prevent the joint from becoming a weak link. Gear transmission enhances load transfer: The speed reduction transmission structure of the large gear and the small gear screw (the diameter of the large gear is larger than the meshing end of the small gear screw) can amplify the extrusion moment, enabling the long pressure blocks to generate a stable and continuous pressing force, improving the joint stiffness and bearing capacity, and meeting the requirements of high-rise modular buildings for the lateral displacement resistance ability of joints.

[0024] (2) The displacement compensation space designed inside the large gear allows the small gear screw to adapt to a certain degree of alignment deviation when the long pressure blocks move, avoiding connection failure caused by on-site installation errors and reducing the additional cost of reinforcement design.

[0025] (3) Fully prefabricated standardized design: The bolt connection holes of all components (such as module beam reinforcement structures, gear slides, push-pull slides, etc.) are standard prefabricated holes, eliminating the need for on-site drilling or welding. This avoids the residual stress problem in the heat-affected zone of welding, reduces on-site operation time and manual errors, and meets the requirements of high efficiency and low carbon in industrialized prefabrication. Non-welding connection: Abandoning the traditional welding process solves the problems of low welding efficiency and high operation requirements. At the same time, it avoids the influence of welding defects on the joint performance and improves the quality controllability.

[0026] (4) The surface contact stress mode between the long strip pressure block and the module beam can disperse the stress concentration under dynamic loads (such as wind vibration) compared with the point contact of bolt connections, reduce local fatigue damage, and extend the service life of the joint. The non-rigid connection structure (through gear transmission and sliding compensation) can dissipate energy through appropriate deformation under large earthquakes, avoiding problems such as slip or fracture of bolt connections, improving the ductility and energy dissipation capacity of the joint, and meeting the seismic requirements in earthquake-prone areas.

[0027] (5) Factory prefabrication reduces on-site resource waste and carbon emissions, meeting the national goals of building low-carbon and green development. The symmetrically distributed gear screws and long strip pressure block structure can adapt to standardized module units, facilitating the rapid alignment and connection of upper and lower modules, and shortening the overall construction period.

[0028] The technical solutions of the present invention will be further described in detail below with reference to the drawings and embodiments. Description of the Drawings

[0029] Figure 1 It is a schematic diagram of the overall structure of the upper and lower module beam connection device of the upper and lower module beam connection device of an embodiment of a boltless steel structure module building connection device of the present invention;

[0030] Figure 2 It is a schematic diagram of the split structure of the gear slide and the push-pull slide and the module beam reinforcement structure of an embodiment of a boltless steel structure module building connection device of the present invention;

[0031] Figure 3 It is a detailed schematic diagram of the large gear and the small gear screw of an embodiment of a boltless steel structure module building connection device of the present invention;

[0032] Figure 4 It is a schematic diagram of the structure of the small gear screw of an embodiment of a boltless steel structure module building connection device of the present invention;

[0033] Figure 5 It is a schematic diagram of the connection between the upper and lower module beam connection device and the module beam of an embodiment of a boltless steel structure module building connection device of the present invention;

[0034] Figure 6 Schematic diagram of the connection between the large gear and the small gear screw of the upper and lower module beams of a bolt - hole - free steel - structure module building connection device according to an embodiment of the present invention;

[0035] Figure 7 Schematic diagram of the structure of the thread groove of the upper and lower module beam connection device of a bolt - hole - free steel - structure module building connection device according to an embodiment of the present invention;

[0036] Figure 8 Schematic diagram of the overall structure after the connection between the upper and lower module beam connection device and the module beam of a bolt - hole - free steel - structure module building connection device according to an embodiment of the present invention.

[0037] Reference numerals: 1, module beam reinforcement structure; 11, sliding through - slot; 12, thread groove; 2, large gear; 3, small gear screw; 4, long strip pressure block; 5, gear sliding plate; 6, push - pull sliding plate; 7, module beam. Detailed implementation manners

[0038] In order to better understand the above - mentioned technical solution, the following will describe the above - mentioned technical solution in detail in conjunction with the accompanying drawings of the specification and specific implementation manners. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0039] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms of "a", "the" and "said" used in the embodiments of the present invention and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. "Plural" generally includes at least two.

[0040] It should also be noted that the term "comprises", "comprising" or any other variation thereof is intended to cover a non - exclusive inclusion, such that a commodity or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such commodity or device. Without further limitation, an element defined by the phrase "comprising an..." does not exclude the presence of additional identical elements in the commodity or device comprising said element.

[0041] The present invention provides a connection device for upper and lower module beams of a bolt - hole - free steel - structure module building. The connection device for upper and lower module beams of a bolt - hole - free steel - structure module building is characterized in that it includes a module beam reinforcement structure 1, a large gear 2, a small gear screw 3, a long strip pressure block 4, a gear sliding plate 5 and a push - pull sliding plate 6;

[0042] The module beam reinforcement structure 1 is a "C"-shaped integral structure, and two symmetrically arranged sliding through slots 11 are provided on its side surface;

[0043] The large gears 2 are arranged oppositely on the inner side surface of the module beam reinforcement structure 1, are connected to the module beam reinforcement structure 1 by bolts, and are symmetrically distributed on the module beam reinforcement structure 1;

[0044] The small gear screws 3 are arranged at the upper and lower opposite positions of the module beam reinforcement structure 1, are symmetrically arranged up and down on the module beam reinforcement structure 1, the small gear screws 3 are threadedly connected to the module beam reinforcement structure 1, and form a gear transmission cooperation with the large gears 2;

[0045] There are two long strip pressure blocks 4, which are respectively fixedly connected to the upper and lower symmetrically arranged small gear screws 3 by screws, and the two long strip pressure blocks 4 move relatively under the drive of the small gear screws 3;

[0046] The gear slide plate 5 and the push-pull slide plate 6 are respectively arranged on both sides of the side surface of the module beam reinforcement structure 1, the push-pull slide plate 6 is slidably connected to the sliding through slot 11 of the module beam reinforcement structure 1, the gear slide plate 5 forms a gear transmission cooperation with the large gear 2, and the gear slide plate 5 is fixedly connected to the push-pull slide plate 6 by bolts.

[0047] Specifically, the module beam reinforcement structure 1 adopts a "C"-shaped integral structure, providing a strong reinforcement function. Through this design, the stability and load-bearing capacity of the module beam are enhanced, and at the same time, the preset sliding through slots 11 in the structure provide a track for the subsequent sliding device, ensuring the sliding property and accuracy of the connecting device.

[0048] To further optimize the above technical solution, the large gear 2 and the small gear screw 3 form a gear transmission cooperation, and the diameter of the large gear 2 is larger than the diameter of the meshing end of the small gear screw 3, forming a speed reduction transmission structure.

[0049] It should be noted that the large gear 2 is located on the inner surface of the module beam reinforcement structure 1 and forms a gear transmission cooperation with the small gear screw 3. Since the diameter of the large gear 2 is larger than the diameter of the meshing end of the small gear screw 3, during the transmission process, the system can avoid instability caused by excessive movement and at the same time provide high control accuracy.

[0050] To further optimize the above technical solution, inward thread grooves 12 are provided at the positions corresponding to the small gear screws 3 on the upper and lower inner surfaces of the module beam reinforcement structure 1, the screw ends of the small gear screws 3 are threadedly matched with the thread grooves 12, and the long strip pressure block 4 is driven to squeeze towards the middle of the module beam 7 by rotation.

[0051] Specifically, through the gear transmission with the large gear 2, the rotational motion drives the pinion screw 3 to drive the long pressure block 4 to move synchronously. The pinion screw 3 cooperates with the threaded groove 12 on the inner side of the module beam reinforcement structure 1 to accurately control the pushing of the long pressure block 4.

[0052] In order to further optimize the above technical solution, an axial displacement compensation space is provided inside the large gear 2, so that when the small gear screw 3 drives the long pressure block 4 to move, displacement deviation will occur without failure.

[0053] It should be noted that during the gear transmission process, the displacement of the pinion screw 3 may cause axial deviation. To address this problem, an axial displacement compensation space is designed inside the large gear 2. This compensation space can ensure that when the pinion screw 3 drives the long pressure block 4 to move, the displacement deviation generated will not cause transmission failure, thereby ensuring the stable operation of the device. The long pressure block 4 is connected to the pinion screw 3, and the rotation of the pinion screw 3 pushes the long pressure block 4 to move along the middle of the module beam. The design of the synchronous movement of the long pressure block 4 ensures uniform pressure distribution between the upper and lower module beams, thereby achieving a stable connection to the module beam 7. The design of the long pressure block 4 can apply pressure evenly to prevent deformation or loosening caused by uneven force, thereby enhancing the stability of the entire structure.

[0054] In order to further optimize the above technical solution, the bolt connection holes of the gear slide plate 5 and the push-pull slide plate 6 are all standard prefabricated holes, and no on-site drilling is required.

[0055] Specifically, the gear slide 5 cooperates with the large gear 2 in gear transmission, ensuring that the rotation of the large gear 2 can be accurately transmitted to the pushing device of the long pressure block 4. The gear slide 5 can effectively control the movement of the pressure block by combining with the large gear 2. The push-pull slide 6 is connected to the sliding groove of the module beam reinforcement structure 1, allowing the push-pull slide 6 to move freely along the track, so that the meshing angle of the gear slide 5 can be flexibly adjusted to control the rotation of the large gear 2. The combination of the push-pull slide 6 and the gear slide 5 can work together, making the entire connection process precise and efficient.

[0056] In order to further optimize the above technical solution, the construction method of the upper and lower module beam connection device is as follows:

[0057] Lift the upper module to the top of the lower module, align the upper and lower module beams with the locating pins at the ends, and place the assembled upper and lower module beam connection device on the upper and lower module beams;

[0058] Move the push-pull slide plate 6 to drive the gear slide plate 5 to mesh with the large gear 2 to rotate, and the large gear 2 is in transmission with the small gear screw 3, thereby driving the small gear screw 3 to rotate;

[0059] When the pinion screw 3 rotates, the screw end thereof cooperates with the inner thread groove 12 of the module beam reinforcement structure 1, driving the upper and lower symmetric strip pressure blocks 4 to synchronously move towards the middle of the module beam 7;

[0060] The upper and lower symmetric strip pressure blocks 4 form opposite forces on the upper and lower module beams to realize the connection of the upper and lower module beams, and finally confirm that all components are installed in place.

[0061] Working principle: The positioning pins at the ends of the upper and lower module beams are initially aligned to ensure the accurate relative position of the connecting device and the module beam, reducing the difficulty of subsequent adjustment. An external force pushes the push-pull slide plate 6 to horizontally move along the sliding through groove 11, and the gear slide plate 5 moves synchronously with the push-pull slide plate 6. Its tooth shape meshes with the large gear 2, forcing the large gear 2 to rotate around the fixed axis; the large gear 2 drives the pinion screw 3 to rotate. The screw end of the pinion screw 3 cooperates with the inner thread groove 12 of the module beam reinforcement structure 1 and moves axially during rotation, driving the upper and lower symmetric strip pressure blocks 4 to synchronously squeeze towards the middle of the module beam 7; the strip pressure blocks 4 tightly clamp the upper and lower module beams through bidirectional pressure to form a mechanical connection. There is no need for bolt drilling, and the load is transmitted by friction and extrusion force. The standard prefabricated holes and symmetric structure design ensure the installation accuracy of each component, reduce the on-site processing steps, and meet the requirements of "factory prefabrication + on-site rapid assembly" of modular buildings.

[0062] Therefore, the present invention adopts a connecting device for upper and lower module beams of a boltless steel structure module building with the above structure. The strip pressure blocks are driven by the pinion screw to squeeze towards the middle of the module beam, forming a tight mechanical bite, replacing the single-point force-bearing mode of traditional bolts and welding. It can effectively resist the combined action of bending moment, shear force and axial force, and avoid the node becoming a weak link. Gear transmission enhances load transfer: The speed reduction transmission structure of the large gear and the pinion screw (the diameter of the large gear is larger than the meshing end of the pinion screw) can amplify the extrusion torque, enabling the strip pressure block to generate a stable and continuous pressing force, improving the node stiffness and bearing capacity, and meeting the requirements of high-rise modular buildings for the lateral displacement resistance ability of nodes. The displacement compensation space designed inside the large gear allows the pinion screw to adapt to a certain degree of alignment deviation when the strip pressure block moves, avoiding connection failure caused by on-site installation errors and reducing the additional cost of reinforcement design.

[0063] The bolt connection holes of all components (module beam reinforcement structure, gear slide plate, push-pull slide plate, etc.) are standard prefabricated holes, without the need for on-site drilling or welding, avoiding the residual stress problem in the welding heat-affected zone, reducing the on-site operation time and manual errors, and meeting the requirements of high efficiency and low carbon in industrial prefabrication. Non-welding connection: Abandoning the traditional welding process solves the problems of low welding efficiency and high operation requirements, and at the same time avoids the influence of welding defects on the node performance, improving the quality controllability.

[0064] The surface contact stress mode between the long strip pressure block and the modular beam can disperse the stress concentration under dynamic loads (such as wind vibration) compared with the point contact of bolt connection, reduce local fatigue damage, and extend the service life of the joint. The non-rigid connection structure (through gear transmission and sliding compensation) can dissipate energy through moderate deformation under large earthquakes, avoid the problems of bolt connection slip or fracture, improve the ductility and energy dissipation capacity of the joint, and meet the seismic requirements in earthquake-prone areas.

[0065] Factory prefabrication reduces on-site resource waste and carbon emissions, meeting the national goals of building low-carbon and green development. The symmetrically distributed gear screws and long strip pressure block structure can be adapted to standardized modular units, facilitating the rapid alignment and connection of upper and lower modules, and shortening the overall construction period.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that they can still modify or equivalently replace the technical solutions of the present invention, and these modifications or equivalent replacements cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A device for connecting upper and lower module beams of a steel structure module building without bolt holes, characterized in that: It includes a module beam reinforcement structure, a large gear, a small gear screw, a long strip pressure block, a gear slide plate and a push-pull slide plate; The module beam reinforcement structure is a "C"-shaped integral structure, and two symmetrically arranged sliding through grooves are provided on its side surface; The large gears are arranged oppositely on the inner side surface of the module beam reinforcement structure, are connected to the module beam reinforcement structure by bolts, and are symmetrically distributed on the module beam reinforcement structure; The small gear screws are arranged at the upper and lower opposite positions of the module beam reinforcement structure, are symmetrically arranged up and down on the module beam reinforcement structure, the small gear screws are threadedly connected to the module beam reinforcement structure, and form a gear transmission fit with the large gears; There are two long strip pressure blocks, which are respectively fixedly connected to the upper and lower symmetrically arranged small gear screws through screws, and the two long strip pressure blocks move relatively under the drive of the small gear screws; The gear slide plate and the push-pull slide plate are respectively arranged on both sides of the side surface of the module beam reinforcement structure, the push-pull slide plate is slidably connected to the sliding through groove of the module beam reinforcement structure, the gear slide plate forms a gear transmission fit with the large gear, and the gear slide plate is fixedly connected to the push-pull slide plate by bolts; The large gear and the small gear screw are in gear transmission fit, and the diameter of the large gear is larger than the diameter of the meshing end of the small gear screw, forming a speed reduction transmission structure; Threaded grooves facing inwards are provided at the positions corresponding to the small gear screws on the upper and lower inner surfaces of the module beam reinforcement structure, and the screw ends of the small gear screws are in threaded fit with the threaded grooves, and the long strip pressure blocks are driven to squeeze towards the middle of the module beam by rotation; An axial displacement compensation space is provided inside the large gear, so that when the small gear screw drives the long strip pressure block to move, displacement deviation occurs without failure.

2. The upper and lower module beam connection device of a steel structure module building without bolt holes according to claim 1, characterized in that: The bolt connection holes of the gear slide plate and the push-pull slide plate are both standard prefabricated holes and do not require on-site drilling.

3. A device for connecting upper and lower module beams of a steel structure module building without bolt holes according to any one of claims 1 to 2, characterized in that: The construction method of the upper and lower module beam connection device is as follows: Lift the upper module to directly above the lower module, initially align it through the positioning pins at the ends of the upper and lower module beams, and place the assembled upper and lower module beam connection device at the upper and lower module beams; Move the push-pull slide plate to drive the gear slide plate to engage and rotate the large gear, and the large gear and the small gear screw are传动设置 (it should be "transmission arranged" in English, but this might be a misspelling in the original Chinese, assuming it means "transmission connection"), so as to drive the small gear screw to rotate; When the small gear screw rotates, the screw end cooperates with the threaded groove on the inner side of the module beam reinforcement structure, and drives the upper and lower symmetric long strip pressure blocks to move synchronously towards the middle of the module beam; The upper and lower symmetric long strip pressure blocks form opposite forces on the upper and lower module beams to realize the connection of the upper and lower module beams, and finally confirm that all components are installed in place.

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