A detachable and reusable I-beam under-span structure unsupported construction connection device and installation method

Abstract

This invention provides a detachable, reusable I-beam under-support construction connection device and installation method, belonging to the field of building construction technology. The detachable, reusable I-beam under-support construction connection device includes a connection system, a hanging system, and an adjustment system. The hanging system and the adjustment system are assembled and connected to the connection system. The hanging system is used to fix and install the main concrete slab joists, and the adjustment system is used to adjust the elevation of the main concrete joists, serving as a reverse hanging support. The connection system includes an L-shaped steel plate, two irregularly shaped steel plates, four rectangular steel plates, two connecting bolts, and multiple nuts. The connection system is used to connect with the I-beam and can share the construction load with the I-beam. The hanging system includes a hanger rod, a nut, a steel pad, and a U-shaped groove. This invention can solve the problem of high time and cost in the construction of traditional concrete joist support frames.

Description

Technical Field

[0001] This invention belongs to the field of building construction technology, and specifically relates to a detachable and reusable I-beam hanging structure unsupported construction connection device and installation method. Background Technology

[0002] With the booming development of the construction industry, large-span structures are becoming increasingly common. The construction and installation of large-span steel space frame and concrete slab composite structures often employ full-span scaffolding, Bailey beam + scaffolding combinations, and scaffolding structures. However, for specific structures or even post-cast parts, assembling full-span scaffolding for large-span, high-ceiling structures takes the longest time and is the most expensive. While using Bailey beam + scaffolding combinations can significantly reduce the size of the scaffold and shorten the construction time, the cost is not much different from that of full-span scaffolding. Although scaffolding structures are simpler and more convenient to construct, they still occupy the working space and construction time for large-span steel space frame and concrete slab composite structures.

[0003] Therefore, in the infrastructure construction boom, the original support frame construction method cannot meet the tight construction schedule. To ensure the low-cost and high-efficiency construction of large-span, high-space space frame and concrete slab composite structures, an innovative unsupported construction connection device and installation method for detachable and reusable I-beam hanging structures is proposed. The main keel of the concrete formwork is installed on the above-mentioned connection node to complete the construction, which has great application prospects. Generally, steel beams can be directly passed through or ear plates can be welded to the upper part of the steel beams. However, after comprehensive analysis, passing through steel beams will affect the stress state and durability of the entire structure. Welding ear plates will generate certain shear stress in the contact area between the flange of the I-beam and the ear plate. Moreover, after the ear plates are welded, in order to ensure the normal stress state of the structure, they can only be partially cut and recycled or even cannot be recycled. Therefore, a detachable and reusable unsupported construction connection device and installation method for I-beam hanging structures is proposed. It can be reused while ensuring the normal stress state of the steel structure, making construction convenient and reducing construction costs. Summary of the Invention

[0004] In view of this, the present invention provides a detachable and reusable I-beam hanging structure unsupported construction connection device and installation method, which can solve the problem of high time and cost of traditional concrete keel construction of load-bearing frame, and further improve construction efficiency by utilizing the reusability of the detachable structure.

[0005] This invention is implemented as follows:

[0006] This invention provides a detachable, reusable, unsupported construction connection device for an I-beam under-hanging structure. It includes a connection system, a hanging system, and an adjustment system. The hanging system and the adjustment system are assembled and connected to the connection system. The hanging system is used to fix and install the main concrete slab joists, and the adjustment system is used to adjust the elevation of the main concrete slab joists, serving as a reverse-hanging support. The connection system includes one L-shaped steel plate, two irregularly shaped steel plates, four rectangular steel plates, two connecting bolts, and multiple nuts. The connection system is used to connect to the I-beam and can work together with the I-beam. The system bears the construction load; the mounting system includes a hanger rod, a nut, a steel pad, and a U-shaped groove. One end of the hanger rod is connected to the connection system via the steel pad, and the other end of the hanger rod is fitted with the U-shaped groove and the nut for placing the main concrete slab joist. The adjustment system includes a visual adjustment pad and an adjustment nut. The visual adjustment pad is positioned between the steel pad and the adjustment nut. The adjustment nut is used to adjust the elevation of the hanger rod, thereby adjusting the elevation of the U-shaped groove and ultimately achieving the desired elevation of the main concrete slab joist.

[0007] The technical advantages of the detachable and reusable I-beam hanging structure unsupported construction connection device provided by the present invention are as follows: By setting up a connection system, a hanging system and an adjustment system, after the current segment is completed, the hanging system, the adjustment system and the connection system are removed in sequence and transferred to the next segment construction, realizing reusability.

[0008] Based on the above technical solution, the unsupported construction connection device for the detachable and reusable I-beam hanging structure of the present invention can be further improved as follows:

[0009] Two of the aforementioned irregular steel plates are arranged in parallel intervals. Four of the aforementioned rectangular steel plates and a connecting screw are fixedly connected to one of the aforementioned irregular steel plates. The other of the aforementioned irregular steel plates has a connecting hole for fitting the connecting screw. The diameter of the connecting hole is slightly larger than the diameter of the connecting screw, which facilitates alignment and insertion of the connecting screw for fixed installation. The irregular steel plates and the rectangular steel plates are made of high-strength alloy steel to ensure sufficient strength to withstand construction loads.

[0010] Furthermore, the rectangular steel plate and one of the connecting screws are fixedly connected to the irregular steel plate by welding, and the other connecting screw is welded to the L-shaped steel plate. The L-shaped steel plate is installed and fixed to the steel pad through the connecting screw, and the steel pad is also provided with connecting holes adapted to the connecting screw.

[0011] Furthermore, the steel pad has a connecting hole corresponding to the boom, and the end of the boom protrudes outward through the connecting hole. It is installed and connected to the boom by the adjusting nut at the outside of the connecting hole. The top and bottom outer walls of the boom are respectively provided with threaded structures. The threaded structure at the top is a fine thread, and the inner wall of the adjusting nut is provided with a matching internal thread to improve the adjustment accuracy and ensure a good fit and force transmission performance between the boom and the adjusting nut, so as to achieve the elevation adjustment.

[0012] Furthermore, the threaded structure at the bottom is used to cooperate with the nut to install and connect the U-shaped groove at the bottom end of the hanger. A washer is provided at the bottom of the hanger above the installation position of the U-shaped groove. The washer is used to cooperate with the nut to fix the U-shaped groove. The U-shaped groove is used to tightly hold the main keel of the concrete slab. The depth of the groove ensures that the main keel of the concrete slab will not easily slip off after being hung. The depth of the groove is 1 / 2 to 2 / 3 of the diameter of the main keel of the concrete slab.

[0013] Furthermore, the U-shaped groove is made of high-strength steel, and an anti-slip pad is installed on the upper surface of the groove. The anti-slip pad is fixed to the upper surface of the U-shaped groove by bonding or bolting. Both the anti-slip pad and the U-shaped groove have connection holes adapted to the hanger rod. The anti-slip pad has a matching groove at the position of the pad at the bottom of the hanger rod to keep the receiving surfaces at the same level. The thickness of the anti-slip pad is 3-5mm.

[0014] Furthermore, the adjusting nut adopts a self-locking structure and is hexagonal in shape, making it easy to operate with a wrench. The internal thread of the adjusting nut matches the fine thread segment at the top of the hanger. By rotating the adjusting nut, the extension length of the adjusting nut in the fine thread segment can be adjusted, thereby realizing the adjustment of the elevation of the main keel of the concrete slab.

[0015] Furthermore, the irregular steel plate is provided with a slot, and the irregular steel plates on both sides are used to cooperate with the L-shaped steel plate to form a clamping structure for installation and connection with the upper horizontal steel of the I-beam. By first contacting and fixing with the I-beam through the slot, and then installing the L-shaped steel plate at the corresponding position, it is possible to directly install and connect any segment of the same I-beam, which solves the drawbacks of installation from the end.

[0016] Furthermore, the bottom end of the visual adjustment pad is fixedly installed to the top of the steel pad. The visual adjustment pad has a wide scale engraved along its axial direction, and the scale range covers the elevation adjustment range. The visual adjustment pad is provided with a pointer mechanism and a pressure compensation spring. The pointer mechanism consists of a pointer body, a slider, and a sliding rail. The slider is fixedly connected to the pointer to allow the pointer to slide along the sliding rail. The sliding rail is fixedly installed on the visual adjustment pad. One end of the pressure compensation spring is fixedly connected to the slider of the pointer mechanism, and the other end is connected to the inside of the visual adjustment pad to ensure that the internal spring can uniformly transmit force and provide effective compensation for the pointer mechanism.

[0017] This invention provides a method for installing a detachable, reusable I-beam under-span structure unsupported construction connection device, comprising the following steps:

[0018] S10: First, arrange and fix four rectangular steel plates at intervals along the inner side of a special-shaped steel plate. Use one of the connecting screws and nuts to fix the L-shaped steel plate into a whole. Then use another connecting screw and nut to connect another special-shaped steel plate to the side close to the L-shaped steel plate and pull it to fix it.

[0019] S20: Fix the assembled connection system on the steel beam, pass one end of the hanger rod on the hanging system through the steel pad, use nuts to connect the screw rod to the connection system and fix it in place, pass the other end through the U-shaped groove and use nuts to fix it in place, and fix the main keel of the concrete slab through the U-shaped groove;

[0020] S30: Install a visual adjustment pad and adjustment nut above the hanger rod. Adjust the height of the U-shaped groove at the bottom of the hanger rod by turning the adjustment nut to adjust the height of the main keel of the concrete slab.

[0021] S40: After completing steps S10 to S30, adjust the elevation of the U-shaped groove of the hanging system to the preset height by adjusting the adjusting nut of the adjusting system in conjunction with the visual adjusting pad. After the concrete slab construction is completed, remove the adjusting nut, U-shaped groove, hanger, visual adjusting pad, steel pad, and connecting nut of the system in sequence. After removal, use them in the next section of construction. Install according to the steps of S10 to S30 above, and reuse them repeatedly.

[0022] Compared with existing technologies, the beneficial effects of the detachable and reusable I-beam hanging structure unsupported construction connection device and installation method provided by the present invention are as follows: by constructing a connection system, hanging system and adjustment system based on the I-beam, construction efficiency can be effectively improved; its detachable and reusable design greatly reduces construction costs and reduces resource waste and construction costs; there is no need to set up time-consuming support, saving construction space and facilitating the layout and management of the construction site, allowing for earlier insertion of construction procedures; the connection is firm and reliable, has no impact on the steel beam structure, and can ensure construction quality and safety. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the installation of a detachable and reusable I-beam hanging structure without support construction connection device.

[0025] Figure 2 This is a schematic diagram of the connection system structure;

[0026] Figure 3 A schematic diagram of the adjustment pad structure for visualization;

[0027] Figure 4 This is a schematic diagram of the pointer mechanism.

[0028] Figure 5 A flowchart of an installation method for a detachable and reusable I-beam hanging structure without support construction connection device;

[0029] The attached diagram lists the components represented by each number as follows:

[0030] 1. Connection system; 11. L-shaped steel plate; 12. Irregular steel plate; 13. Rectangular steel plate; 14. Connecting screw; 2. Hanging system; 21. Hanging rod; 22. Steel pad; 23. U-shaped groove; 3. Adjustment system; 31. Visual adjustment pad; 311. Pressure compensation spring; 312. Pointer mechanism; 313. Pointer body; 314. Slider; 315. Sliding rail; 32. Adjusting nut; 4. Slot. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0032] like Figure 1-4 The diagram illustrates an embodiment of a detachable, reusable I-beam under-hanging structure unsupported construction connection device provided by the present invention. This embodiment includes a connection system 1, a hanging system 2, and an adjustment system 3. The hanging system 2 and adjustment system 3 are assembled and connected to the connection system 1. The hanging system 2 is used to fix and install the main concrete slab joists, and the adjustment system 3 is used to adjust the elevation of the main concrete joists, serving as a reverse hanging support. The connection system 1 includes an L-shaped steel plate 11, two irregularly shaped steel plates 12, four rectangular steel plates 13, two connecting screws 14, and multiple nuts. The connection system 1 is used to connect with the I-beam and can be used with… The I-beams share the construction load; the hanging system 2 includes a hanger 21, a nut, a steel pad 22, and a U-shaped channel 23. One end of the hanger 21 is connected to the connection system 1 via the steel pad 22, and the other end of the hanger 21 is fitted with the U-shaped channel 23 and a nut for placing the main joist of the concrete slab; the adjustment system 3 includes a visual adjustment pad 31 and an adjustment nut 32. The visual adjustment pad 31 is placed between the steel pad 22 and the adjustment nut 32. The adjustment nut 32 is used to adjust the elevation of the hanger 21, thereby adjusting the elevation of the U-shaped channel 23 and achieving the desired elevation of the main joist of the concrete slab.

[0033] In the above technical solution, two irregularly shaped steel plates 12 are arranged in parallel intervals, and four rectangular steel plates 13 and a connecting screw 14 are fixedly connected to one of the irregularly shaped steel plates 12. The other irregularly shaped steel plate 12 has a connecting hole for fitting the connecting screw 14. The diameter of the connecting hole is slightly larger than the diameter of the connecting screw 14, which facilitates the alignment and insertion of the connecting screw 14 for fixed installation. The irregularly shaped steel plate 12 and the rectangular steel plate 13 are made of high-strength alloy steel to ensure sufficient strength to withstand construction loads.

[0034] Furthermore, in the above technical solution, the rectangular steel plate 13 and one of the connecting screws 14 are fixedly connected to the irregular steel plate 12 by welding, and the other connecting screw 14 is welded to the L-shaped steel plate 11. The L-shaped steel plate 11 is installed and fixed to the steel pad 22 by the connecting screw 14. The steel pad 22 is also provided with a connecting hole adapted to the connecting screw 14.

[0035] Furthermore, in the above technical solution, the steel pad 22 has a connection hole corresponding to the hanger 21. The end of the hanger 21 protrudes outward through the connection hole and is connected to the outside of the connection hole by an adjusting nut 32. The top and bottom outer walls of the hanger 21 are respectively provided with threaded structures. The threaded structure at the top is a fine thread, and the inner wall of the adjusting nut 32 is provided with a matching internal thread to improve the adjustment accuracy and ensure good fit and force transmission performance between the hanger 21 and the adjusting nut 32, so as to achieve the elevation adjustment.

[0036] Furthermore, in the above technical solution, the threaded structure at the bottom is used to cooperate with the nut to install and connect the U-shaped groove 23 at the bottom of the hanger 21. A washer is provided above the installation position of the U-shaped groove 23 at the bottom of the hanger 21. The washer is used to cooperate with the nut to fix the U-shaped groove 23. The U-shaped groove 23 is used to tightly hold the main keel of the concrete slab. The depth of the groove ensures that the main keel of the concrete slab will not easily slip off after being hung. The depth of the groove is 1 / 2 to 2 / 3 of the diameter of the main keel of the concrete slab.

[0037] Furthermore, in the above technical solution, the U-shaped groove 23 is made of high-strength steel, and an anti-slip pad is installed on the upper surface of the groove. The anti-slip pad is fixed to the upper surface of the U-shaped groove 23 by bonding or bolting. Both the anti-slip pad and the U-shaped groove 23 have connection holes that are compatible with the hanger 21. The anti-slip pad has a matching groove at the position of the bottom pad of the hanger 21 to keep the receiving surface at the same level. The thickness of the anti-slip pad is 3-5mm.

[0038] Furthermore, in the above technical solution, the adjusting nut 32 adopts a self-locking structure and is hexagonal in shape, which is convenient to operate with a wrench. The internal thread of the adjusting nut 32 matches the fine thread segment at the top of the hanger 21. By rotating the adjusting nut 32, the extension length of the adjusting nut 32 in the fine thread segment can be adjusted, thereby realizing the adjustment of the elevation of the main keel of the concrete slab.

[0039] The self-locking adjusting nut 32 has one or more elastic elements inside, such as spring plates or nylon rings. When the adjusting nut is tightened, the elastic elements will deform accordingly, increasing the friction between the threads and preventing the adjusting nut from loosening due to vibration or other reasons during construction. In addition, the surface of the adjusting nut can be galvanized or chrome-plated to improve its corrosion resistance.

[0040] Furthermore, in the above technical solution, the irregular steel plate 12 is provided with a slot 4. The irregular steel plates 12 on both sides are used to cooperate with the L-shaped steel plate 11 to form a clamping structure and install and connect with the upper horizontal steel of the I-beam through the slot 4. By first contacting and fixing with the I-beam through the slot 4, and then installing the L-shaped steel plate 11 at the corresponding position, it is possible to directly install and connect any segment position on the same I-beam, which solves the drawbacks of installation from the end.

[0041] Furthermore, in the above technical solution, the bottom end of the visual adjustment pad 31 is fixedly installed with the top of the steel pad 22. The visual adjustment pad 31 has a wide scale engraved along its axial direction, and the scale range covers the elevation adjustment range. The visual adjustment pad 31 is provided with a pointer mechanism 312 and a pressure compensation spring 311. The pointer mechanism 312 consists of a pointer body 313, a slider 314, and a sliding rail 315. The slider 314 is fixedly connected to the pointer, which is used to enable the pointer to slide along the sliding rail 315. The sliding rail 315 is fixedly installed on the visual adjustment pad 31. One end of the pressure compensation spring 311 is fixedly connected to the slider 314 of the pointer mechanism 312, and the other end is connected to the inside of the visual adjustment pad 31, ensuring that the internal spring can transmit force evenly and produce an effective compensation effect on the pointer mechanism 312.

[0042] The visual adjustment pad 31 is located between the adjustment nut 32 and the steel pad 22, serving to transmit pressure and display the adjustment height. The pointer mechanism 312 is mounted on the visual adjustment pad 31, tightly connected to the pad but capable of relatively independent movement; the pressure compensation spring 311 is mounted between the pointer mechanism 312 and the visual adjustment pad 31, positioned in the middle of the two, serving to connect and transmit force.

[0043] The pointer body 313 is a slender arrow-shaped structure used to point to the scale. Its length is designed to ensure that it can clearly cover the scale range. The slider 314 is the connecting part between the pointer body 313 and the sliding rail 315. It is fixedly connected to the pointer body 313 so that the pointer can move together with the slider 314. The sliding rail 315 is fixedly installed in the visual adjustment pad 31, and its position corresponds to the scale on the pad, ensuring that the movement of the pointer on the sliding rail 315 can accurately reflect the height change of the boom.

[0044] The pointer body 313 is mounted on the sliding rail 315 via a slider 314. The slider 314 and the sliding rail 315 are connected by a precise sliding fit, such as a dovetail groove structure or a T-groove structure, so that the slider 314 can slide smoothly on the rail without easily disengaging from it. This connection method ensures the stability and accuracy of the pointer movement.

[0045] One end of the pressure compensation spring 311 is connected to the bottom of the slider 314 of the pointer mechanism 312 or the pointer body 313. The connection method can be welding, hook connection or installation connection using connectors, so that it has a compressible range of motion; the other end is connected and fixed to the inner bottom wall of the visual adjustment pad 31. The connection point can be selected to be near the edge of the scale to ensure that the spring can transmit force evenly and produce an effective compensation effect on the pointer mechanism 312.

[0046] In the above scheme, the adjustment nut rotates to move the boom up and down. When the adjustment nut is rotated, the rotational motion of the adjustment nut is converted into the linear up and down movement of the boom due to the fine-pitch thread connection between the adjustment nut and the boom. The bottom of the adjustment nut contacts the upper layer of the visual adjustment pad. As the adjustment nut is rotated downwards, it gradually applies pressure to the pressure compensation spring. As the boom moves, the pressure compensation spring points to the current height scale via a connected pointer mechanism.

[0047] like Figure 5 The diagram shows a flowchart of an installation method for a detachable, reusable I-beam under-span structure unsupported construction connection device provided by the present invention, including the following steps:

[0048] S10: First, arrange and fix four rectangular steel plates 13 at intervals along the inner side of a special-shaped steel plate 12. Use one of the connecting screws 14 and nuts to fix the L-shaped steel plate 11 into a whole. Then use another connecting screw 14 and nut to connect another special-shaped steel plate 12 to the side close to the L-shaped steel plate 11 and pull it to fix it.

[0049] S20: Fix the assembled connection system 1 on the steel beam, pass one end of the hanger 21 on the hanging system 2 through the steel pad 22, use nuts to connect the screw 14 to the connection system 1 and fix it, and pass the other end through the U-shaped groove 23 and fix it with nuts. The main keel of the concrete slab is fixed by the U-shaped groove 23.

[0050] S30: Install a visual adjustment pad 31 and an adjustment nut 32 above the hanger 21. Adjust the height of the U-shaped groove 23 at the bottom of the hanger 21 by turning the adjustment nut 32 to achieve the purpose of adjusting the height of the main keel of the concrete slab.

[0051] S40: After completing steps S10 to S30, adjust the elevation of the U-shaped groove 23 of the hanging system 2 to the preset height by adjusting the adjusting nut 32 of the adjusting system 3 in conjunction with the visual adjusting pad 31. After the concrete slab construction is completed, remove the adjusting nut 32, U-shaped groove 23, hanging rod 21, visual adjusting pad 31, steel pad 22, and the nut connecting the system 1 in sequence. After removal, use them in the next section of construction. Install them according to the steps S10 to S30 above, and reuse them repeatedly.

Claims

1. A detachable and reusable I-beam under-span structure unsupported construction connection device, characterized in that, The system includes a connection system (1), a mounting system (2), and an adjustment system (3). The mounting system (2) and the adjustment system (3) are assembled and connected to the connection system (1). The mounting system (2) is used to fix and install the main keel of the concrete slab, and the adjustment system (3) is used to adjust the elevation of the main keel of the concrete slab, serving as a reverse mounting support. The connection system (1) includes an L-shaped steel plate (11), two irregular steel plates (12), four rectangular steel plates (13), two connecting screws (14), and multiple nuts. The connection system (1) is used to connect with the I-beam and can connect with the I-beam. The beams share the construction load; the hanging system (2) includes a hanger (21), a nut, a steel pad (22), and a U-shaped groove (23). One end of the hanger (21) is connected to the connection system (1) through the steel pad (22), and the other end of the hanger (21) is equipped with the U-shaped groove (23) and the nut for placing the main keel of the concrete slab; the adjustment system (3) includes a visual adjustment pad (31) and an adjustment nut (32). The visual adjustment pad (31) is set between the steel pad (22) and the adjustment nut (32). The elevation of the hanger rod (21) is adjusted by the adjusting nut (32), thereby adjusting the elevation of the U-shaped groove (23) and achieving the effect of raising the main keel of the concrete slab. Two irregular steel plates (12) are arranged in parallel intervals. Four rectangular steel plates (13) and a connecting screw (14) are fixedly connected to one of the irregular steel plates (12). The other irregular steel plate (12) has a connecting hole for fitting the connecting screw (14). The diameter of the connecting hole is slightly larger than the diameter of the connecting screw (14) to facilitate alignment of the connecting screw (14). 4) Insert for fixed installation; the special-shaped steel plate (12) and the rectangular steel plate (13) are high-strength alloy steel to ensure sufficient strength to withstand construction loads; the rectangular steel plate (13) and one of the connecting screws (14) are fixedly connected to the special-shaped steel plate (12) by welding, and the other connecting screw (14) is welded to the L-shaped steel plate (11). The L-shaped steel plate (11) is installed and fixed to the steel pad (22) through the connecting screw (14). The steel pad (22) is also provided with connecting holes adapted to the connecting screw (14).

2. The unsupported construction connection device for a detachable and reusable I-beam hanging structure according to claim 1, characterized in that, The steel pad (22) has a connection hole corresponding to the rod (21). The end of the rod (21) protrudes outward through the connection hole and is connected to the outside of the connection hole by the adjusting nut (32). The top and bottom outer walls of the rod (21) are respectively provided with threaded structures. The threaded structure at the top is a fine thread, and the inner wall of the adjusting nut (32) is provided with a matching internal thread to improve the adjustment accuracy and ensure good fit and force transmission performance between the rod (21) and the adjusting nut (32) to achieve elevation adjustment.

3. The unsupported construction connection device for a detachable and reusable I-beam hanging structure according to claim 2, characterized in that, The threaded structure at the bottom is used to cooperate with the nut to install and connect the U-shaped groove (23) at the bottom end of the hanger (21). A washer is provided at the bottom of the hanger (21) above the installation position of the U-shaped groove (23). The washer is used to cooperate with the nut to fix the U-shaped groove (23). The U-shaped groove (23) is used to tightly hold the main keel of the concrete slab. The depth of the groove ensures that the main keel of the concrete slab will not easily slip off after being hung. The depth of the groove is 1 / 2 to 2 / 3 of the diameter of the main keel of the concrete slab.

4. The unsupported construction connection device for a detachable and reusable I-beam hanging structure according to claim 3, characterized in that, The U-shaped groove (23) is made of high-strength steel, and an anti-slip pad is installed on the upper surface of the groove. The anti-slip pad is fixed to the upper surface of the U-shaped groove (23) by bonding or bolting. Both the anti-slip pad and the U-shaped groove (23) have connection holes adapted to the hanger rod (21). The anti-slip pad has a matching groove at the position of the pad at the bottom of the hanger rod (21) to keep the receiving surface at the same level. The thickness of the anti-slip pad is 3~5mm.

5. The unsupported construction connection device for a detachable and reusable I-beam hanging structure according to claim 4, characterized in that, The adjusting nut (32) adopts a self-locking structure and is hexagonal in shape, which is convenient to operate with a wrench. The internal thread of the adjusting nut (32) matches the fine thread segment at the top of the hanger (21). By rotating the adjusting nut (32), the extension length of the adjusting nut (32) in the fine thread segment can be adjusted, thereby realizing the adjustment of the elevation of the main keel of the concrete slab.

6. The unsupported construction connection device for a detachable and reusable I-beam hanging structure according to claim 5, characterized in that, The irregular steel plate (12) is provided with a slot (4). The irregular steel plates (12) on both sides are used to cooperate with the L-shaped steel plate (11) through the slot (4) to form a clamping structure and install and connect with the upper horizontal steel of the I-beam. By first contacting and fixing with the I-beam through the slot (4), and then installing the L-shaped steel plate (11) at the corresponding position, it is possible to directly install and connect any segment position on the same I-beam, which solves the drawback of installation from the end.

7. The unsupported construction connection device for a detachable and reusable I-beam hanging structure according to claim 6, characterized in that, The bottom end of the visual adjustment pad (31) is fixedly installed to the top of the steel pad (22). The visual adjustment pad (31) has a wide scale engraved along the axial direction, and the scale range covers the elevation adjustment range. The visual adjustment pad (31) is provided with a pointer mechanism (312) and a pressure compensation spring (311). The pointer mechanism (312) consists of a pointer body (313), a slider (314) and a sliding rail (315). The slider (314) is fixedly connected to the pointer, so that the pointer can slide along the sliding rail (315). The sliding rail (315) is fixedly installed on the visual adjustment pad (31). One end of the pressure compensation spring (311) is fixedly connected to the slider (314) of the pointer mechanism (312), and the other end is connected to the inside of the visual adjustment pad (31), so as to ensure that the internal spring can transmit force evenly and produce an effective compensation effect on the pointer mechanism (312).

8. The unsupported construction connection device for a detachable and reusable I-beam hanging structure according to claim 7, characterized in that, The installation method includes the following steps: S10: First, arrange and fix four rectangular steel plates (13) at intervals along the inner side of a special-shaped steel plate (12). Use one of the connecting screws (14) and nuts to fix the L-shaped steel plate (11) into a whole. Then use another connecting screw (14) and nuts to connect another special-shaped steel plate (12) to the side close to the L-shaped steel plate (11) and fix it in a pulling manner. S20: Fix the assembled connection system (1) on the steel beam, pass one end of the hanger (21) on the hanging system (2) through the steel pad (22), use nuts to connect the screw (14) to the connection system (1) and fix it, and pass the other end through the U-shaped groove (23) and fix it with nuts. Fix the main keel of the concrete slab through the U-shaped groove (23); S30: Install a visual adjustment pad (31) and an adjustment nut (32) above the hanger (21). Adjust the height of the U-shaped groove (23) at the bottom of the hanger (21) by turning the adjustment nut (32) to achieve the purpose of adjusting the height of the main keel of the concrete slab. S40: After completing steps S10 to S30, adjust the elevation of the U-shaped groove (23) of the hanging system (2) to the preset height by adjusting the adjusting nut (32) of the adjusting system (3) in conjunction with the visual adjusting pad (31). After the concrete slab construction is completed, remove the adjusting nut (32), U-shaped groove (23), hanging rod (21), visual adjusting pad (31), steel pad (22), and the nut of the connecting system (1) in sequence. After removal, use it in the next section of construction. Install according to the steps of S10 to S30 above and use it repeatedly.

Images